НАСОС

FIELD: engines and pumps. SUBSTANCE: pump comprises housing made up of two intersecting cylinder parts 2, 3. Note here that inlet 4 and outlet 5 are arranged on opposite sides. Cylinders 2, 3 accommodate rotors 6, 7 to revolve about central lengthwise axis. Larger crosswise axes of said rotors run, at least in on phase, perpendicular to each other. Said rotors may roll over each other and relative to housing inner wall so that tightness is ensured. Generators originating from intersection of larger crosswise axes of every rotor in opposite directions extend inclined to adequate central lengthwise axis 8, 9. Every rotor surrounds two club-like parts with their narrow section connected together. Rotors 6, 7 feature configuration and relative arrangement to allow club0like section of one rotor to be engaged with taper of another rotor in case lather crosswise axes of both rotors are mutually perpendicular. Sine generators double as sealing lines. Openings 4 and 5 are shaped to triangle or trapezoid. Sides or lateral edges of said openings are shaped to sine or cosine. EFFECT: higher efficiency. 5 cl, 7 dwg РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) 2 463 481 (13) C2 (51) МПК F04C 2/18 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ (21)(22) Заявка: 2007132984/06, 03.09.2007 (24) Дата начала отсчета срока действия патента: 03.09.2007 (73) Патентообладатель(и): Герольд унд Ко. Гмбх (DE) R U Приоритет(ы): (30) Конвенционный приоритет: 05.09.2006 DE 102006041633.3 (72) Автор(ы): ЛАНГЕР Герд (DE) (43) Дата публикации заявки: 10.03.2009 Бюл. № 7 2 4 6 3 4 8 1 (45) Опубликовано: 10.10.2012 Бюл. № 28 Адрес для переписки: 101000, Москва, Центр, а/я 732, Агентство ТРИА РОБИТ, пат.пов. Г.М.Вашиной, рег.№ 139 C 2 C 2 (56) Список документов, цитированных в отчете о поиске: US 1142734 A, 08.06.1915. DE 102005017575 A1, 16.03.2006. DE 4121684 A1, 07.01.1993. RU 2197642 С1, 27.01.2003. GB 382953 А, 10.11.1932. R U 2 4 6 3 4 8 1 (54) НАСОС (57) ...

НАСОС

ÐÎÑÑÈÉÑÊÀß ÔÅÄÅÐÀÖÈß RU (19) (11) 2007 132 984 (13) A (51) ÌÏÊ F04C 2/18 (2006.01) ÔÅÄÅÐÀËÜÍÀß ÑËÓÆÁÀ ÏÎ ÈÍÒÅËËÅÊÒÓÀËÜÍÎÉ ÑÎÁÑÒÂÅÍÍÎÑÒÈ, ÏÀÒÅÍÒÀÌ È ÒÎÂÀÐÍÛÌ ÇÍÀÊÀÌ (12) ÇÀßÂÊÀ ÍÀ ÈÇÎÁÐÅÒÅÍÈÅ (21), (22) Çà âêà: 2007132984/06, 03.09.2007 (71) Çà âèòåëü(è): Ãåðîëüä óíä Êî. Ãìáõ (DE) (30) Êîíâåíöèîííûé ïðèîðèòåò: 05.09.2006 DE 102006041633.3 (72) Àâòîð(û): ËÀÍÃÅÐ Ãåðä (DE) (43) Äàòà ïóáëèêàöèè çà âêè: 10.03.2009 Áþë. ¹ 7 A 2 0 0 7 1 3 2 9 8 4 R U Ñòðàíèöà: 1 RU A (57) Ôîðìóëà èçîáðåòåíè 1. Íàñîñ, ñîäåðæàùèé êîðïóñ, âûïîëíåííûé èç äâóõ âçàèìíî ïåðåñåêàþùèõñ ÷àñòåé öèëèíäðà (2, 3), ïðè÷åì íà ïðîòèâîïîëîæíûõ ñòîðîíàõ ïðåäóñìîòðåíû âõîäíîå è âûõîäíîå îòâåðñòè (4,5) è â êàæäîé ÷àñòè öèëèíäðà (2, 3) ðàñïîëîæåí âðàùàþùèéñ âîêðóã åå öåíòðàëüíîé ïðîäîëüíîé îñè (8, 9) ðîòîð (6, 7), ïðè ýòîì áîëüøèå ïîïåðå÷íûå îñè ðîòîðîâ ïî ìåíüøåé ìåðå â îäíîé ôàçå äâèæåíè íàõîä òñ ïî÷òè ïåðïåíäèêóë ðíî äðóã ê äðóãó, à ðîòîðû (6, 7) ïåðåêàòûâàþòñ ïëîòíî äðóã ê äðóãó è îòíîñèòåëüíî âíóòðåííåé ñòåíêè êîðïóñà íàñîñà, ïðè÷åì îáðàçóþùèå (12), èñõîä ùèå èç òî÷êè ïåðåñå÷åíè áîëüøèõ ïîïåðå÷íûõ îñåé êàæäîãî ðîòîðà (6, 7) â ïðîòèâîïîëîæíîì äðóã äðóãó íàïðàâëåíèè ïðîõîä ò íàêëîííî ê ñîîòâåòñòâóþùåé öåíòðàëüíîé ïðîäîëüíîé îñè (8, 9) è êàæäûé ðîòîð (6, 7) îõâàòûâàåò äâå ïî÷òè áóëàâîîáðàçíûå ÷àñòè, êîòîðûå ñâîèìè áîëåå óçêèìè êîíöàìè ñîåäèíåíû äðóã ñ äðóãîì ïîñðåäñòâîì ñóæåíè , ïðè÷åì ðîòîðû (6, 7) èìåþò òàêóþ êîíôèãóðàöèþ è ðàñïîëîæåíû îòíîñèòåëüíî äðóã äðóãà òàêèì îáðàçîì, ÷òî, åñëè áîëüøèå ïîïåðå÷íûå îñè îáîèõ ðîòîðîâ (6, 7) ñòàíîâ òñ âçàèìíî ïåðïåíäèêóë ðíî, òî áóëàâîîáðàçíà ÷àñòü îäíîãî ðîòîðà (6, 7) âõîäèò â çàöåïëåíèå ñ ñóæåíèåì äðóãîãî ðîòîðà, è îáà ðîòîðà ïåðåêàòûâàþòñ , ïëîòíî ïðèæèìà ñü äðóã ê äðóãó, ïðè ýòîì â êàæäîé ôàçå âðàùàòåëüíîãî äâèæåíè îáà ðîòîðà îáðàçóþò ðàâíîìåðíî óâåëè÷èâàþùèéñ îáúåì âñàñûâàíè ïåðåä âõîäíûì îòâåðñòèåì (4) è ðàâíîìåðíî óìåíüøàþùèéñ âûõîäíîé îáúåì ïåðåä âûõîäíûì îòâåðñòèåì (5), îòëè÷àþùèéñ òåì, ÷òî ôóíêöèîíèðóþùèå êàê óïëîòíèòåëüíûå ëèíèè îáðàçóþùèå (12) âûïîëíåíû ...

КОЛОВРАТНЫЙ НАСОС, СПОСОБ ФИКСАЦИИ И СПОСОБ ДЕМОНТАЖА ЕГО ВРАЩАЮЩИХСЯ ПОРШНЕЙ

РОТОРНЫЙ НАСОС С ОПТИМИЗИРОВАННЫМИ ВПУСКАМИ И ВЫПУСКАМИ

1. Роторный насос (10), состоящий из корпуса (12) насоса, который снабжен впуском (14) и выпуском (16), причем корпус насоса (12) имеет облицовку (18), и в корпусе насоса (12) или же в пределах облицовки (18) расположены по меньшей мере два противоположно вращающихся ротора (20), которые во время их вращения образуют насосные камеры (22), причем роторы (20) уплотнены друг по отношению друг к другу, по отношению к корпусу (12) насоса и по отношению к облицовке (18), и причем в корпусе (12) насоса и/или в облицовке (18) в каждой насосной камере (22) расположены по меньшей мере две выемки (24), и причем выемки (24) расположены в пространственной близости к впуску (14) и/или к выпуску (16), отличающийся тем, что корпус (12) насоса и/или облицовка (18) в области впуска (14) и в области выпуска (16) имеет в каждом случае усиления (26) облицовки (18), посредством которых реализовано уменьшение поперечного сечения и, что поперечное сечение впуска (14) и выпуска (16) расширяются в направлении от усилений (26) к концам (28) и, что усиления имеют совместный угол охвата более 180°.2. Роторный насос (10) по п. 1, отличающийся тем, что в каждой насосной камере (22) расположены четыре выемки (24), причем выемки (24) расположены всегда парами.3. Роторный насос (10) по п. 1, отличающийся тем, что за счет открывания и закрывания выемок (24) роторами (20) является предотвращаемой пульсация роторного насоса (10).4. Роторный насос (10) по п. 2, отличающийся тем, что за счет открывания и закрывания выемок (24) роторами (20) является предотвращаемой пульсация роторного насоса (10).5. Роторный насос (10) по п. 1, отличающийся тем, что усиления (26) снабжены углом (w) от 20 до 160°, предпочтительно углом (w) от 45 до 135°.6. Роторный насос (10) по п. 1, отличающийся тем, что за счет расширения является возможным оптимизированное течение перекачиваемой среды, причем оптимизированное течени

ROOTS BLOWER PUMP

ROTARY PUMP FOR THE PROMOTION OF GUELLE OR SUCH.

Gear pump

ROTOR FOR A ROTARY MACHINE

METERING CAP WITH INTEGRAL PUMP-MOTOR HAND OPERATED MIXING FACILITY

A first component of a flowable material is squeezed out of a cartridge (C) which can be emptied by means of a press (P). The main component flows through the feed line (8) to the outlet line (11) and in the process drives two rotors (31) seated in the metering chamber (9) in the housing (1). Gear wheels (34) are seated on the shafts (30) of the rotors (31), which mesh with each other and in this way form a gear pump (24). The gear pump (24) conveys an admixing component from an integrated container (18) via a feed line into the outlet line (11). At least two components can be admixed in a metered manner in an extremely exact ratio to each other by means of the metering cap of the invention .

Dosing Cap

Durch Spritzverfahren angefertigter buchsenförmiger Gegenstand.

Umlaufende Verdrängungsvorrichtung für Flüssigkeiten

Drehkolbenpumpe für zähflüssige Medien

Pompe hydraulique à pistons rotatifs

Machine hydraulique à engrenages droits

Drehkolbenpumpe zum Fördern zähnflüssiger Medien

Improvements with the positive-displacement pumps

PUMP TO USE WITH a DEVICE Of APPLICATION OF PAINTING

DEVICE FOR REDUCING LEAKAGE IN ROTARY ENGINES AT LOW RUNNING SPEEDS

TWIN ELLIPSE PUMP

High pressure slurry pump - has externally driven lobed, contactless meshing but sealing rotors and air outlet in pressure chamber

The pump is intended for moving a mixed medium against high pressure, the medium containing a slurry-like component. It comprises two rotors (2) on parallel shafts with meshing radial lobes (3) recesses arranged in a housing (8) and both externally driven so that they are in sealing but not in pressure contact with one another. The pump chamber (5) has an air outlet orifice (17) on the pressure side. At least the outer surface of the rotors may be in a resilient but wear-resistant material (9) whilst the housing walls with which they are in contact have low-friction characteristics. The rotors may be covered in plastic whilst the housing is in high grade steel.

Anordnung zum Bestimmen eines Drucks

Eine Anordnung (100) zum Bestimmen eines durch eine mittels eines Elektromotors (31) angetriebene Pumpe (30) erzeugten Drucks (64) ist dazu eingerichtet, den Druck (64) auf Grundlage einer Differenz aus einem inneren Drehmoment (114) und einem Verlustmoment (108) zu ermitteln, wobei die Anordnung (100) weiterhin dazu eingerichtet ist, das innere Drehmoment (114) aus einem Motorstrom (110) und einer Motorkonstante (ke) zu ermitteln.

Pumpenrotor

Vakuumpumpenrotor zur Verwendung in einer Vakuumpumpe mit einem Roots-Pumpenmechanismus, wobei der Rotor mindestens zwei hohle Nocken aufweist, wobei jeder Nocken eine Außenwand, die ein Nockenprofil definiert, einen Hohlraum im allgemeinen innerhalb der Außenwand, und mindestens eine Verstärkungsrippe hat, die in dem Hohlraum angeordnet ist, um einer Beanspruchung der Nocken zu widerstehen, die während der Drehung erzeugt wird.

Vacuum pump component

A dry pump component coated with a first layer 102 comprising a high phosphorous nickel plating (NiP) of at least 5 μm thickness coated with a second layer 100 comprising a high phosphorous nickel with nickel phosphorous and fluoropolymer (NiP-PTFE) of at least 5 μm thickness, wherein the ratio of the thickness of the first layer of NiP to the thickness of the second layer of NiP-PTFE provides high corrosion resistance and galling resistance. The fluoropolymer in the second layer may include at least one of polytetrafluoroethylene, perfluoroether, and Polyethylenimine. Preferably, the pump component is at least one of a stator component 12, an end plate, a rotor shaft component and a rotor component, where the rotor component has one of a Northey (claw) rotor, a Roots rotor or a Screw rotor profile. A dry vacuum pump comprising the component is also claimed.

ROTARY PUMP WITH A PUMP HOUSING AND TWO DOUPLE SWING TURNING PISTONS

DEVICE FOR SEPARATING DISTURBING SOLIDS FROM BIO SUSPENSIONS

PISTON FOR A ROTARY PISTON PUMP

The invention relates to a rotary piston pump comprising a housing with a housing interior, an inlet opening, and an outlet opening; a first rotary piston which is mounted within the housing interior in a rotational manner about a first rotational axis; and a second rotary piston which is mounted within the housing interior in a rotational manner about a second rotational axis. The first rotary piston and the second rotary piston engage into each other in a region between the first and the second axis and displace liquid. The first rotary piston has a frame assembly which comprises multiple mutually spaced plates and is at least partly filled and coated with a polymer material.

GROOVED PUMP CHAMBER WALLS FOR FLUSHING FIBER DEPOGROOVED PUMP CHAMBER WALLS FOR FLUSHING FIBER DEPOSITS SITS

A rotary lobe pump has a pair of rotary lobes rotatably mounted in a pump chamber having end walls perpendicular to axes of the lobes and a side wall with which the rotors making sealing contact. At least one of the end walls is provided with a shallow groove in a region between the axes, the groove being of a selected depth and width to permit solid material lodged between the rotors and at least one of the end walls to become disengaged and flushed out while allowing a minimum of fluid to flow through the groove causing pressure loss in the pump.

Improvements with the rotary piston pumps

MACHINE HAS REPRESSION

bomba de pistão rotativo com entradas e saídas otimizadas

CONSTANT RATIO POST-MIX BEVERAGE DISPENSING VALVE

The present invention is a post-mix beverage dispensing valve for accurately maintainig the proper ratio of two liquid beverage components. The present invention includes a valve main body (12) having a gear pump (60) secured thereto. The gear pump includes two sets of oval gears (94, 102). One set of oval gears (94) is in fluid communication with a source of pressurized carbonated water, and the second set (102) is in fluid communication with a source of syrup. The valve body also includes solenoid operated pallet valves (22, 34) for each of the beverage components. One gear of each gear pair is secured to a common rotating shaft. Operation of the solenoid provides for simultaneous opening of both pallet valves whereby the pressurized carbonated water provides for the driving of both gear pairs. The desired ratio between the beverage components is maintained at a constant ratio as a function of the size of the gear pairs relative to each other.

Double rotary piston positive displacement pump with variable offset transmission means

A dual piston rotary pump (10) having a housing (12) equipped with two ports (13a, 13b) to accommodate fluid flow through the housing (12) and having two generally cylindrical chambers (14a, 14b) within which cylindrical pistons (16a, 16b) are disposed. The chambers (14a, 14b) intersect to form a passage (15) therebetween and to allow the pistons (16a, 16b) to engage in tangential contact. Each piston (16a, 16b) rotates within its chamber (14a, 14b) in a direction counter to the direction of the other piston while maintaining tangential contact with the other piston and at least one piston is in tangential contact with its chamber wall. The pump includes variable offset transmission means (52a, 50a, 48a, 54a) to change the offset of the center of the piston from the center of rotation of the piston during the course of each rotation to allow the pistons (16a, 16b) to remain in mutual tangential contact at all times. The offset transmission means (52a, 50a, 48a, 54a) allows the pistons ( ...

Rotary pump with cutting means

A rotary pump of the type having a pair of double-lobed intermeshing rotors rotatably mounted in a housing is provided with a concave recess in the leading edge of each lobe of each rotor which defines a cutting edge with the end surface of each lobe for comminuting solid or stringy material entrained in the liquid being pumped.

Coupling structure for vacuum exhaust device and vacuum exhaust system

Provided is a coupling structure for vacuum exhaust devices each including a pump chamber and a casing that demarcates the pump chamber. The coupling structure includes a first end surface formed on a first side of the casing, and a second end surface formed on the second side of the casing, the second side being the opposite side of the first side. The casing of a first vacuum exhaust device and the casing of a second vacuum exhaust device among a plurality of vacuum exhaust devices are arranged to be directly superposed on each other such that the first end surface provided to the first vacuum exhaust device and the second end surface provided to the second vacuum exhaust device come into contact with each other. By fastening the first end surface and the second end surface, the first vacuum exhaust device and the second vacuum exhaust device are connected to each other such that gas can flow between the casing of the first vacuum exhaust device and the casing of the second vacuum exhaust ...

LUBRICATING PUMP

A lubricating pump having a first stage and a second stage; the first stage in turn has an intake connectable hydraulically to a tank of lubricating fluid, and a delivery outlet connectable hydraulically to a lubricated member; the first stage compresses the lubricating fluid from the tank to a pressure for supply to the member; the second stage in turn has an inlet connectable hydraulically to a casing housing the member, and an outlet connectable hydraulically to the tank; the second stage feeds the lubricating fluid in the casing back into the tank; the second stage is a Roots type, and has a first and a second rotor rotating about respective axes to feed the lubricating fluid from the inlet to the outlet; and the first and second rotor are operated by the first stage.

Multiphase separation and pressure letdown method

A method and apparatus for the separation of gas and liquid-solid slurry under pressure, and passage of the liquid-solid slurry to an atmospheric discharge.

Lobe pump

Bei einer Wälzkolbenpumpe ist zur Verbesserung der Pumpleistung und Erhöhung der Standfestigkeit vorgesehen, dass die als Dichtlinien fungierenden Mantellinien sinusförmig ausgebildet sind.

VERDRAENGERPUMPE

WASSERKRAFTMASCHINE

Umlaufende Fluessigkeitsverdraengungsvorrichtung

Verfahren zur Pulsationsdämpfung in einer ein Fluid führenden Anlage

Es wird ein Verfahren zur Pulsationsdämpfung in einer ein Fluid führenden Anlage (1) angegeben, wobei das Fluid in einem Dämpfungsabschnitt (2, 22, 29, 33, 36, 37) der Anlage (1) durch einen Schlauch (8) strömt, der sich gegen ein Druckpolster in einem zu einer Gehäusewand (11) ausgebildeten Zwischenraum (10) abstützt. Dabei ist vorgesehen den Druck im Zwischenraum (10) auf eine minimale Pulsationsamplitude zu regeln. Weiter wird eine entsprechende Anlage (1) mit Pulsationsdämpfung angegeben.

Improvements in bearings for rotary meter or pump pistons

... 953,008. Rotary pumps and meters. BOPP & REUTHER G.m.b.H. April 5, 1961 [Nov. 30, 1960], No. 12187/61. Heading F1F. A rotary gear pump or meter piston includes a bushing of e.g., carbon made up of a plurality of parts, 4, 5, 6, which are fitted in the piston bore such that the part 5 bears on a stationary spindle, while parts 4 and 6 have a larger internal diameter, project slightly beyond the piston end faces and have clearance with the part 5. Spring rings 8 are provided to limit axial displacement of bushing part 5.

Improvements in rotary pumps

... 290,541. Schmidt, R., and Patiag- Patentverwertungs - und Industrie Akt.-Ges. June 3, 1927, [Convention date]. Movable-abutment type. - In rotary pumps, a pair of camshaped pistons in contact are rotated about fixed axes in opposite directions and with equal angular velocity, the pistons being free from recessed pa.rts and having no packing, so that the line of contact alwavs lies in the plane containing the axes. The pistons K, k, Fig. 1, rotate in a casing G comprising two intersecting cylinders, and to ensure contact with the casing to shut off the working chamber at zero position, each piston has corresponding circular concentric arcs m-n, m<1>-n<1>. Two pumps may be arranged on the same shafts in one casing, or two more pistons of equal size may be arranged at equal distances around a central piston. The pistons K, may be of exactly the same size. Packing drums and abutments. - Packing- plates 15, Fig. 2, on each side of the pistons 2. 3 provide spaces 20 in communication with the ...

Rotary positive-displacement pumps

In a pump having two interengaged externally lobed contrarotating rotors in a casing the profile of each half of each rotor lobe in a plane perpendicular to the axis of rotation of the rotor consists of an involute curve B and arcs of circles A, C, the pumping efficiency being thereby improved. ...

Rotor for pump

ROTARY POSITIVE DISPLACEMENT PUMP

... 1405955 Rotary positive-displacement pumps RANSBURG CORP 12 Oct 1972 [14 Oct 1971] 47106/72 Heading F1F A rotary positive-displacement pump comprises a gear casing 13 containing gears 1 for driving rotors 6 located in parallel bores 42, 43 of a housing 22, 7, 37, each rotor, Fig. 13, having lobes 56, 57 with pressure-relief valves 64 therein for permitting by-pass of fluid from the forward high-pressure face of the lobe to the trailing low-pressure face, and each rotor having its lobes offset from the rotor hub 25 in an axial direction, the hub being keyed by key 4 to the respective shaft 2 and being received in the end-plate 37 nearest to the gears 1. The manner in which each lobe is offset from its respective hub is shown for a single-lobe rotor in Fig. 12. The ports 29, 30 are coaxial, being rectangular in outline at the outer surface of the peripheral housing wall 22 and square in outline where they open into the pumping chamber, the transition being such that the cross-sectional area ...

ROTARY PUMP

Liquid manure pump

HYDRAULIC ENGINE

PUMP WITH ROTARY CAMS

Piston for a rotary piston pump

The invention relates to a rotary piston pump comprising a housing with a housing interior, an inlet opening, and an outlet opening; a first rotary piston which is mounted within the housing interior in a rotational manner about a first rotational axis; and a second rotary piston which is mounted within the housing interior in a rotational manner about a second rotational axis. The first rotary piston and the second rotary piston engage into each other in a region between the first and the second axis and displace liquid. The first rotary piston has a frame assembly which comprises multiple mutually spaced plates and is at least partly filled and coated with a polymer material.

Water turbines or pumps

ROTARY PUMP

SINTERING A MULTI-LOBED HELICAL ROTOR

The present disclosure relates to a method and system for manufacturing a multi- lobed helical rotor. The method for manufacturing a multi-lobed helical rotor may comprise mixing one or more powdered metals, compacting a mixture of one or more powdered metals to form a solid metal piece, sintering the solid metal piece, and polishing the solid metal piece. The system may comprise a positive displacement pump, which may comprise a casing, a multi-lobed helical rotor disposed in the casing, wherein the multi-lobed helical rotor comprise sintered powdered metals, an inlet to the casing, and an outlet leading from the easing.

ROTARY INFUSION PUMPS

An infusion pump (110) includes a housing (112); a rotor (230) inserted into the housing, the rotor including a first ring (38a) of surfaces (236a) that form channels with the housing, and a second ring (38b) of surfaces (236b) that form channels with the housing, the second channel forming surfaces radially offset from the first channel forming surfaces; and a motor (40) operably engaged to rotate the rotor to cause the first and second channel forming surfaces to pump a flow of fluid, the radial offsetting of the second channel forming surfaces from the first channel forming surfaces dampening a pulsatility of the flow of fluid.

Rotary pump

PUMP TO USE WITH a DEVICE Of APPLICATION OF PAINTING

Rotary pump also being able to be used as compressor

Rotor for rotary pump

Mode of assembly of the pistons of rotating impeller machines

Positive-displacement pump

ROTARY POSITIVE DISPLACEMENT PUMP

Pump for products in powder form or granulous or pasty

FLEXIBLE CONTAINER WITH A DISPOSABLE PUMP

In a flexible container comprising a disposable pump (1) made of plastic, the disposable pump (1) has a pump housing (6), which has an inlet opening that communicates with the flexible container, and an outlet nozzle (7) that lies opposite the inlet opening. In the pump housing (6), two rotors are arranged which can be driven contradirectionally, are sealingly mounted, and which lie in abutment so as to be mutually sealing. The outlet nozzle (7) has a thread (8) on which a union nut (9) is screwed which has a terminal collar (10) that is orientated towards the centre. At least one elastic diaphragm (11, 11a, 11b, 11c) that has a self-closing discharge opening is held between the union nut (9) and the outlet-side end of the outlet nozzle (7) in a clamping and replaceable manner.

ROTOR FOR A ROTARY MACHINE

A rotor (25) is provided for a rotary piston pump or other rotary machine. The rotor (25) is partite, comprising an assembly of a plurality of modular elements (12). The rotor assembly (25) is covered in a coating material (63) which can be an epoxy resin. A method of making a coated rotor is also provided.

Multiple Segment Lobe Pump

Designs for multiple segment lobe pumps are shown. The designs include pumps using rotors having two lobes to a plurality of lobes and segments that include two segments to a plurality of segments. Designs for both vertical or straight walled conventional lobed rotors as well as helical lobe rotors are shown. The designs are applicable to a variety of rotors and number of segments. In one particular case the designs enable a three lobe helical pump. 1. A lobe pump comprising:a) a housing having an inlet and an outlet and walls,b) a first shaft and a second shaft, the shafts being elongated cylinders, the first shaft extending beyond a wall of he housing such that it may be rotated by a motor, the shafts fixed within the housing such that their long axes are parallel, the shafts coupled through use of timing gears affixed to a first end of each shaft such that rotation of the first shaft by the motor causes the second shaft to rotate, i) a first lobe rotor having a center, a top surface, a bottom surface, sidewalls and a plurality of lobes symmetrically extending from the center, the lobes extended at a lobe separation angle from one another, the first lobe rotor fixedly attached to the first shaft through the center of the rotor such that rotation of the first shaft causes the first lobe rotor to rotate,', 'ii) a second lobe rotor having a center, a top surface, a bottom surface, sidewalls and a plurality of lobes symmetrically extending from the center, the lobes extended at a lobe separation angle from one another, wherein the first lobe rotor and the second lobe rotor have the same number of lobes and lobe angles, the second lobe rotor fixedly attached to the second shaft through the center of the rotor such that the rotation of the second shaft causes the second rotor to rotate,', 'iii) separation plates positioned above and below the lobe rotors adjacent to the top and bottom surfaces of the lobe rotors, said separation plates acting to physically isolate the ...

КОЛОВРАТНЫЙ НАСОС С ОПТИМИЗИРОВАННЫМИ ВПУСКАМИ И ВЫПУСКАМИ

FIELD: pumps. SUBSTANCE: invention relates to a rotary pump for injection of liquids and for injection of containing solid substances liquids. Lobe rotary pump (10) includes housing (12) equipped with inlet (14) and outlet (16) expanding to appropriate ends, lining (18) located in housing (12) and at least two opposite rotating rotors (20) located inside lining (18), forming during their rotation pump chambers and compacted in relation to each other and relative to lining (18). In each chamber there are at least two made inside lining (18) recesses (24). Distance from recess (24) to inlet (14) or to outlet (16) is equal to from double to five times value of the size of cross section of recess (24). Lining (18) has in the area of inlet (14) and in the area of outlet (16) bulges (26) reducing the cross sections of inlet (14) and outlet (16). EFFECT: invention is aimed at creation of a lobe rotary pump, which provides injection without pulsation. 9 cl, 5 dwg РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (13) 2 601 042 C2 (51) МПК F04C 2/18 (2006.01) F04C 15/00 (2006.01) F04C 15/06 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ОПИСАНИЕ (21)(22) Заявка: ИЗОБРЕТЕНИЯ К ПАТЕНТУ 2014148250/06, 09.04.2013 (24) Дата начала отсчета срока действия патента: 09.04.2013 Приоритет(ы): (30) Конвенционный приоритет: (43) Дата публикации заявки: 20.06.2016 Бюл. № 17 (45) Опубликовано: 27.10.2016 Бюл. № 30 (85) Дата начала рассмотрения заявки PCT на национальной фазе: 02.12.2014 (73) Патентообладатель(и): НЕЧ ПУМПЕН УНД ЗЮСТЕМЕ ГМБХ (DE) (86) Заявка PCT: 2 6 0 1 0 4 2 R U C 2 C 2 DE 2013/100127 (09.04.2013) 2 6 0 1 0 4 2 (56) Список документов, цитированных в отчете о поиске: DE 3427282 A1, 30.01.1986. FR 2292881 A1, 25.06.1976. WO 93/14314 A1, 22.07.1993. GB 2101218 A, 12.01.1983. RU 2007132984 A, 10.03.2009.. R U 02.05.2012 DE 102012008527.3 (72) Автор(ы): ВАЙГЛЬ Штефан (DE), ДЕНК Райнхард (DE), КАМАЛЬ Хишам (DE), ШТРАССЛЬ Йозеф (DE), КУРЦ Роберт (DE), МУРРЕНХОФФ Бернхард ( ...

Drehkolbenpumpe und Gehäuse-Halbschale für selbige

Drehkolbenpumpe zur Förderung eines Feststoffe enthaltenden fluiden Mediums, mit einem Einlass und einem Auslass jeweils für das zu fördernde Medium, mit einem Pumpengehäuse (1) und zwei in dem Pumpengehäuse (1) angeordneten Drehkolben (7) mit ineinandergreifenden Drehkolbenflügeln, dadurch gekennzeichnet, dass das Pumpengehäuse (1) zwei einander gegenüberliegende Gehäuse-Halbschalen (3) aufweist, die das Pumpengehäuse (1) fluiddicht verschließen und dass die Gehäuse-Halbschalen (3) doppelwandig ausgebildet sind.

VORRICHTUNG ZUM VERTEILEN VON INHOMOGENEN FLUESSIGKEITEN, INSBESONDERE GUELLE.

Vorrichtung zur Bearbeitung von Flüssigkeiten, insbesondere mit darin enthaltenen Feststoffen, oder von fließ- oder schüttfähigen, zerkleinerbaren Feststoffen

Elektronische Synchronisation von Drehkolben einer getriebelosen Drehkolbenpumpe mit gradverzahnten Drehkolben

Wasserkraftanlage, mit einem Drehkolbenmotor (1), umfassend- ein Motorengehäuse (2) mit einem Motorraum (4),- eine Einlass- und eine Auslassöffnung (6, 8),- einen ersten, mehrflügeligen Drehkolben (10), der in dem Motorraum (4) angeordnet und um eine erste Ache (A1) drehbar gelagert ist, und- einen zweiten in dem Motorraum (4) angeordneten mehrflügeligen Drehkolben (12), der um eine von der ersten Achse (A1) beabstandete zweite Achse (A2) drehbar gelagert ist und in den ersten Drehkolben (10) kämmend eingreift,wobei der erste und zweite Drehkolben (10,12) durch eine Fluidströmung von der Einlass- zu der Auslassöffnung (6, 8) in Rotation um die erste bzw. zweite Achse (A1, A2) versetzt werden,einem ersten Generator (19), der mechanisch mit dem ersten Drehkolben (10) gekoppelt ist zum Antrieb durch den ersten Drehkolben (10), undeinem zweiten Generator (21), der mechanisch mit dem zweiten Drehkolben (12) gekoppelt ist zum Antrieb durch den zweiten Drehkolben (12),gekennzeichnet durch eine ...

Sintering a multi-lobed helical rotor

The present disclosure relates to a method and system for manufacturing a multi- lobed helical rotor. The method for manufacturing a multi-lobed helical rotor may comprise mixing one or more powdered metals, compacting a mixture of one or more powdered metals to form a solid metal piece, sintering the solid metal piece, and polishing the solid metal piece. The system may comprise a positive displacement pump, which may comprise a casing, a multi-lobed helical rotor disposed in the casing, wherein the multi-lobed helical rotor comprise sintered powdered metals, an inlet to the casing, and an outlet leading from the easing.

Rotor for pump

ROTARY POSITIVE-DISPLACEMENT PUMPS

... 1532911 Rotary positive-displacement fluidmachines CREPACO Inc 28 April 1977 [15 Sept 1976] 17798/77 Heading F1F In a gear-pump for e.g. an esculent fluid, a movable wall 24 is held against end-faces of the gears 13, 14 by fluid-pressure in a cavity 25, which is de-pressurized when the gear chamber 12 is flushed with a cleansing fluid so that the latter can by-pass the gears, Fig. 2a (not shown). The pressure loading of the wall 24 may be supplemented by either a single piston or two pistons disposed in tandem, Figs. 3-6 (not shown).

Improved pumps, motors and driving units of the rotor type

... 891,524. Rotary pumps and motors. SOC. D'ETUDES ET D'EXPLOITATION DU GENERATEUR A PISTON LIBRE. April 3, 1958 [April 8, 1957], No. 10895/58. Class 110 (2). A rotary pump or motor of the Roots type comprises two-lobed rotors rotatable in a bicylindrical casing having oppositely disposed inlet and outlet opening into the casing at the intersection of the cylinders, in which each rotor is formed integral with journal bearings, one on either side, and each bearing is rotatable in a smooth bearing surface in the casing and formed around its periphery with a pair of arcuate recesses separated by plane portions, such that the smooth bearing surfaces on the sides of the rotors opposite to the inlet communicate with the inlet and the smooth bearing surfaces on the sides of the rotors opposite to the outlet communicate with the outlet in order that the rotors together with the journal bearings are in substantial hydraulic lateral balance. As shown in Fig. 5, a pair of interengaging two-lobed rotors ...

Rotor for pump

The present invention relates to a rotor for a vacuum pump (150) having a roots pumping mechanism, the rotor comprising at least two hollow lobes (160, 162, 164, 166), each lobe having an outer wall (208) which defines a lobe profile, a hollow cavity (210) generally inward of the outer wall, and at least one strengthening rib (226) located in the cavity to resist stress on the lobes generated during rotation.

ROTARY PUMP, IN PARTICULAR FOR THE PROMOTION OF WITH PARTICLES LOADED LIQUIDS

Water turbines or pumps

PISTON WITH REPLACEABLE AND/OR ADJUSTABLE SURFACES

A piston for a pump a hub portion defining opposing outer portions, and inserts configured to provide an adjustable surface coupled to each of the opposing outer portions. The hub portion includes a first hub portion and a second hub portion configured to abut one another. Each of the inserts includes an outer shell and a base portion. The first hub portion includes a plurality of the opposing outer portions, and each of the base portions of the inserts is adjustably coupled to respective opposing outer portions of the first hub portion. A pump includes a housing having an inlet and an outlet, and at least two pistons having a hub portion and inserts. The pump may be a positive-displacement, rotary pump, and the pistons may be circumferential pistons.

Piston pump rotary for viscous products.

Self-propelling rotary pump

INTERNAL COMBUSTION ENGINE WITH AT LEAST ONE CRANKCASE OF DRY TYPE

La présente invention concerne un moteur à combustion (1) comportant au moins un carter moteur (2) permettant de définir un logement de guidage (3) dans lequel au moins un vilebrequin (4) est guidé en rotation autour d'un axe de rotation V et lubrifié par un fluide de lubrification, ledit au moins un carter moteur (2) étant de type "sec". Un tel moteur à combustion (1) comporte au moins deux pompes (7, 8) formant un train de pompes (10) coaxiales, ledit train de pompes (10) étant rapporté dans un alésage cylindrique (26) dudit au moins un carter moteur (2).

Rotary pump

POSITIVE DISPLACEMENT PUMP

The present invention relates to a positive displacement pump (10) which comprises: a pump room (for instance, an outer member) (30); a motion member for conveying a fluid by the movement in the pump room (30) (for instance, an inner member) (20); and an abnormal operation detecting means (40) for detecting an abnormal operation. The abnormal operation detecting means (40) comprises: a sensor unit (41) for transmitting microwaves toward the motion member (20) and receiving the reflected waves; and a determining unit (42) for determining the abnormal operation based on the signal outputted from the sensor unit (41). The sensor unit (41) is placed to transmit and receive the microwaves while the fluid in the pump room (30) is placed in between the sensor unit (41) and the motion member (20). Accordingly, provided is a positive displacement pump which can precisely and rapidly detect an abnormal operation. COPYRIGHT KIPO 2016 ...

SCREW ROTOR FOR GAS-EVACUATION PUMP, MANUFACTURING METHOD THEREFOR, GAS-EVACUATION PUMP PROVIDED WITH SAID SCREW ROTOR, AND MANUFACTURING METHOD AND ASSEMBLY METHOD THEREFOR

Provided is a screw rotor that dramatically improves the evacuation performance of a pump and sufficiently ensures safe rotation even with dramatically reduced clearance between said screw rotor and a stator in comparison to conventional screw rotors. When this screw rotor is installed in a pump, the tip surfaces (201) of the teeth of a screw-tooth groove part (103) are separated from the inside wall (203) of the stator (106) by a gap, and a PFA film is provided on the tip surfaces (201). The provision of this PFA film as prescribed further reduces the width of the gap between the free surface of the PFA film and the inside wall (203) of the stator (106) in comparison to conventional screw rotors, thereby drastically improving pump performance. Forming the PFA film by means of melting and remelting processes after the application of PFA to at least the tip surfaces (201) of the screw rotor results in a highly smooth free surface.

Dual rotor flow meter

A positive displacement flow meter includes a pair of smooth oval shaped rotors mounted to a pair of spaced apart rotatable shafts contained within a sealed housing. The rotatable shafts penetrate the measuring chamber and have a pair of toothed, oval shaped timing gears located in a separate gear cavity chamber which are responsible for synchronizing and maintaining the relative orientation of the smooth faced rotors with respect to one another. The fluid that is being metered forms seals between the rotating surfaces of the rotors, as well as between the rotors and the wall of rotor chamber, thus the inlet and outlet plenums are physically isolated and are consequently not in direct communication at any point during the rotation cycle of the rotors. Thus, each rotation of the rotors results in the transport of a precise and known volume of fluid from the inlet plenum to the outlet plenum. A magnetic sensing/counting system, which includes an magnetic actuator attached to one of the rotor ...

MOTOR OIL PUMP ASSEMBLY, STEERING SYSTEM, AND VEHICLE

A motor oil pump assembly includes: an inner sound insulation enclosure encloses an oil pump component, and the inner sound insulation enclosure and the oil pump component define an inner sound insulation cavity filled with low-pressure oil, the inner sound insulation cavity is in communication with a low-pressure cavity of the oil pump component, and the inner sound insulation enclosure is provided with a sound insulation enclosure cavity; and a pre-tightening buffering component, where the pre-tightening buffering component includes a piston and an elastic member, the piston fits in with the sound insulation enclosure cavity, the piston and an upper end cover of the oil pump component are integrally formed, and the elastic member is elastically sandwiched between a top wall of the sound insulation enclosure cavity and the piston, where the sound insulation enclosure cavity is in communication with a high-pressure cavity of the oil pump component.

ROOTS PUMP

A housing unit of a Roots pump includes a rotor housing, which includes a peripheral wall, and a cover member, which closes an opening of the rotor housing. At least one of a mating surface of the peripheral wall or a mating surface of the cover member includes an annular first groove accommodating a seal member. The rotor housing includes a bulging portion including a second groove. The seal member incudes first projections, which project from an annular seal body, and a second projection, which projects further radially inward from the seal body than the first projections. Each first projection includes a distal end that contacts a side surface on a radially inner side or on a radially outer side of the first groove. The second projection is arranged in the second groove to determine the position of the seal body in the first groove.

Self-priming positive displacement pump with sectioned dividing wall

A rotary, self-priming, positive displacement pump is described. The pump may include a pump housing having a fluid inlet and outlet, first and second rotary impellers having vanes, an input shaft and drive gears synchronizing the impellers to avoid clash, and a dividing wall separating a pumping chamber from a chamber containing the drive gears. The dividing wall separates the pumping chamber from the gear chamber, partially supports impeller shafts, and is formed in a plurality of abutting manually separable sections. When manually pulled apart, the separable sections free the impeller shafts for manual removal, to facilitate manual service to the pump. 1. A rotary , self-priming , positive displacement pump for pumping fluids , comprising:a pump housing having a fluid inlet and a fluid outlet;a first rotary impeller in the pump housing, the first rotary impeller comprising a first shaft including first shaft ends rotatably mounted in the pump housing, the first shaft including a plurality of vanes extending outwardly therefrom;a second rotary impeller in the pump housing, the second rotary impeller comprising a second shaft including second shaft ends rotatably mounted in the pump housing, the second shaft including a plurality of vanes extending outwardly therefrom;a first gear secured to the first shaft and a second gear secured to the second shaft, wherein the first gear meshes with the second gear and synchronizes rotation of the first rotary impeller and the second rotary impeller to ensure that the vanes of the first shaft do not contact the vales of the second shaft during rotation;a pumping chamber defined within the pump housing and a gear chamber defined within the pump housing; anda dividing wall within the pump housing, wherein the dividing wall separates the pumping chamber from the gear chamber, and is formed in a plurality of abutting manually separable sections.2. The rotary claim 1 , self-priming claim 1 , positive displacement pump of claim 1 , ...

Simplified roots-type blower

The present disclosure relates to a simplified roots-type blower having an improved sound signature. The roots-type blower includes a rotor bore housing having a molded, one-piece polymeric construction. The rotor bore housing defines a first rotor bore and a second rotor bore. The rotor bore housing also defines a first bearing pocket corresponding to the first rotor bore and a bearing pocket corresponding to the second rotor bore axis. The rotor bore housing further defining a timing gear chamber.

ROTARY LOBE PUMP WITH INTERNAL BEARING

A rotary lobe pump having a pump housing with a pump room, an inlet opening and an outlet opening, a first multi-lobe rotary piston, which is arranged in the pump room and is rotatably mounted about a first axis of rotation, a second multi-lobe rotary piston, which is arranged in the pump room and is rotatably mounted about a second axis of rotation spaced apart from the first axis of rotation and meshingly engages in the first rotary piston, wherein the first and second rotary pistons are drivable in opposite directions and are designed to generate a flow of a conveyed medium from the inlet opening through the pump room to the outlet opening by counter-rotation about the first and second axis of rotation, respectively, and a drive device, which is mechanically coupled to the rotary pistons for driving the rotary pistons. 124-. (canceled)25. A rotary lobe pump for conveying a particle-laden conveyed medium , comprising:a pump housing with a pump room;an inlet opening and an outlet opening;a first, multi-lobe rotary piston, which is arranged in the pump room and is rotatably mounted about a first axis of rotation;a second multi-lobe rotary piston, which is arranged in the pump room, and is rotatably mounted about a second axis of rotation spaced apart from the first axis of rotation and meshingly engages in the first rotary piston;wherein the first and the second rotary pistons are drivable in opposite directions and are designed to generate a flow of the conveyed medium from the inlet opening through the pump room to the outlet opening by counter-rotation about the first and second axis of rotation, respectively;a drive device arranged on one side of the pump housing, which is mechanically coupled to the rotary pistons for driving the rotary pistons;a first fixed axle body, which is arranged inside the first rotary piston and connected to the pump housing on the side of the drive device; andat least one first bearing for rotatably supporting the first rotary piston ...

Positive Displacement Pump With Shaft-Mounted Sleeve

A rotary positive displacement pump comprising a pair of forwardly-positioned sealing arrangements and a pair of forwardly-positioned sleeves are received within a cavity providing for easy maintenance of the pump when the seals need to serviced. Each of the sealing arrangement includes a dynamic seal and a static seal. The dynamic seal is positioned forward of the static seal and abuts a corresponding sleeve and hub. 1. A rotary positive displacement pump for pumping a pumped product , the rotary positive displacement pump comprising:a gear case including a pair of shafts extending therefrom at a forward end;a pump body supported by the gear case on the forward end of the gear case, the pump body having a cover attached thereto so as to define a cavity between the pump body and the cover in which the cavity has an inlet and an outlet, the pump body having a pair of hubs that extend into the cavity in which each of the pair of hubs has an axially-extending opening through each one of which a corresponding one of the pair of shafts from the gear case is received;a pair of rotors, each of the pair of rotors having a central portion received on one of the pair of shafts inside the axially-extending opening of the hub, each rotor having wings attached to the central portion of the rotor in which the wings of the rotor are disposed radially outward of the hub when the central portion of the rotor is attached to the shaft, the rotors on the pair of shafts being rotatable in opposite directions to pump a pumped product through the pump body from the inlet through the cavity to the outlet;a pair of sleeves, each of the pair of sleeves having a wall extending circumferentially along and about a longitudinal axis to define a central opening therein, the central opening of each of the pair of sleeves receiving a corresponding one of the pair of shafts, and each of the pair of sleeves configured to rotate in concert with the corresponding one of the pair of shafts; anda pair of ...

ROTARY PUMP WITH ROTOR BEARING RING

Lobe pumps have rings which can be located at least partially in at least one of cover plates and rotors, if not both to provide at least thrust bearings to space the rotors from the cover plates. Some rotors may have voids in ears to make the rotor lighter in weight with the voids potentially capped, symmetrically disposed, arcuately shaped and/or have other desirable features. Some rotors may have ears extending beyond cutouts which may extend beyond hubs, if not beyond hub extensions as well which may receive cover spigots thereabout. Some rings may act as radial bearings as well when located in the cover spigots. 1. A rotary lobe pump comprising:a rotor housing assisting defining a cavity intermediate side walls, an end wall and a cover plate;parallel first and second shafts extend into the cavity from the end wall;an inlet port and an outlet port communicating with the cavity;first and second rotors connected to the first and second shafts, respectively; each of the first and second rotors having ears with faces directed toward the cover plate connected to a central hub with the hub connected to the respective first and second shaft; andfirst rings intermediate each of the first and second rotors and the cover plate located at least partially in a first ring groove circumnavigating one of the cover plate and rotor, said first rings providing at least a thrust bearing spacing the faces of the first and second rotors from the cover plate.2. The rotary lobe pump of further comprising (a) cutouts spacing portions of the ears from the shaft and (b) cover spigots extending from the cover plate claim 1 , said cover spigots receiving and surrounding portions of the first and second shafts and extending into the cutouts.3. The rotary lobe pump of wherein the cutout extends a depth of at least ⅓ of a depth of the ears.4. The rotary lobe pump of further comprising voids in the ears.5. The rotary lobe pump of wherein at least some of the voids have a depth greater than a ...

SCREW ROTOR FOR EXHAUST PUMP, METHOD FOR MANUFACTURING THE SAME, GAS EXHAUST PUMP HAVING SCREW ROTOR, AND MANUFACTURING METHOD AND ASSEMBLY METHOD OF THE SAME

There is provided a screw rotor that can ensure safe rotation and can greatly increase a pumping performance of a pump. The screw rotor is placed with a gap between a top end surface of a tooth of a screw portion and an inner wall surface of a stator. A PFA film is provided on the top end surface. If the PFA film of the present invention is provided in a predetermined manner, the width of a gap between a free surface of the PFA film and the inner wall surface of the stator can be made significantly smaller than that of a conventional one, so that the pumping performance is greatly improved. After coating at least the top end surface of the screw rotor with PFA, followed by melting and remelting processes, the PFA film is formed to have a high smoothness on its free surface. 2. The screw rotor according to claim 1 , wherein the PFA film is provided on an AlOfilm formed by non-porous anodic oxidization.3. The screw rotor according to claim 1 , wherein the PFA film is provided on a Ni or NiFfilm.5. A manufacturing method of a gas exhaust pump claim 4 , comprising the processes defined in the manufacturing method according to .6. An assembling method of a gas exhaust pump claim 1 , comprising using the screw rotor according to as an assembly part.7. A gas exhaust pump comprising the screw rotor according to . The present invention relates to a screw rotor for a gas exhaust pump used in an apparatus for manufacturing semiconductor devices and electronic devices which use semiconductor-related technology, such as liquid crystal display devices, solar cells, organic FL devices, and LEDs (hereinafter referred to as “semiconductor application electronic devices”), or in an apparatus for manufacturing electronic components for the electronic devices, a method for manufacturing the screw rotor for a gas exhaust pump, a gas exhaust pump having the screw rotor, and a manufacturing method and an assembling method of the gas exhaust pump having the screw rotor.As a gas exhaust ...

PISTON FOR A ROTARY PISTON PUMP

The invention relates to a rotary piston pump comprising a housing with a housing interior, an inlet opening, and an outlet opening; a first rotary piston which is mounted within the housing interior in a rotational manner about a first rotational axis; and a second rotary piston which is mounted within the housing interior in a rotational manner about a second rotational axis. The first rotary piston and the second rotary piston engage into each other in a region between the first and the second axis and displace liquid. The first rotary piston has a frame assembly which comprises multiple mutually spaced plates and is at least partly filled and enveloped with a polymer material. 121.-. (canceled)22. A rotary pump , comprising:a housing with a housing interior;an inlet opening through which liquid can flow into the housing interior;an outlet opening through which liquid can flow out of the housing interior;a first rotary piston rotatably mounted about a first axis of rotation within the housing interior; anda second rotary piston rotatably mounted about a second axis of rotation within the housing interior;wherein the first rotary piston and the second rotary piston mesh in a region between the first and the second axis and displace fluid, and the first rotary piston has a framework arrangement comprising a plurality of mutually spaced-apart plates and the framework arrangement is at least partially filled and at least partially enveloped with a polymer material.23. The rotary piston pump as claimed in claim 22 , wherein the plurality of mutually spaced-apart plates are formed from a material that differs from the polymer material.24. The rotary piston pump as claimed in claim 23 , wherein the plurality of mutually spaced-apart plates are formed from a metallic material.25. The rotary piston pump as claimed in claim 23 , wherein the polymer material is a resiliently elastic material.26. The rotary piston pump as claimed in claim 22 , wherein the plurality of ...

METERING PUMP MADE OF PLASTIC

The invention relates to a disposable metering pump made of plastic for products having solid fractions. Said disposable metering pump has two rotors () which are coupled to each other by means of gears (), can be driven in opposite directions, and are supported in a pump housing (). Each rotor () has a rotor shaft, the rotor shaft ends () of which are supported in the walls of the pump housing (). Each rotor () has two rotor blade walls (), which are arranged diametrically opposite on the rotor shaft. One partially cylindrical rotor blade shoe () is formed at each of the peripheral ends of the rotor blade walls. The rotor blade shoes () lie against the cylindrical inner wall regions of the pump housing () in a sliding and sealing manner. The rotor blade walls () have concave recesses on both sides between the rotor shafts () and the rotor blade shoes (), in each of which recesses an end edge of a rotor blade shoe of the adjacent rotor can mesh. The shaping of the rotor blade shoes and of the recesses is optimized with regard to minimal product residues. 11101156712158451013121414513121424. A plastic disposable metering pump () for products with solid components , the metering pump comprising two rotors () which are coupled to each other by gearwheels () , are configured to be driven in opposite directions and are mounted in a pump housing () provided with a suction connection () and an outlet connection () , wherein the rotors have respective rotor shafts () , rotor shaft ends () of which are supported in walls ( , ) of the pump housing () , and wherein each of the rotors () has two rotor blade walls () , which are arranged diametrically on an associated rotor shaft () and onto peripheral ends of which are formed respective partially cylindrical rotor blade shoes () , wherein the rotor blade shoes () bear slidingly and sealingly against cylindrical inner wall regions of the pump housing () , and wherein , furthermore , the rotor blade walls () have between the ...

COOLANT ENERGY AND EXHAUST ENERGY RECOVERY SYSTEM

The present teachings include a power generation system for recovering waste heat energy from a power plant having a coolant circuit that extends through the power plant. The coolant circuit may also include a radiator and a coolant pump configured to circulate the coolant between the internal combustion engine and the radiator. The power generation system may also include a waste heat recovery circuit including a Roots-type fluid expander configured to generate power at an output shaft by expanding a portion of the coolant and being configured to deliver the power back to the internal combustion engine crankshaft via the output shaft. The waste heat recovery circuit may further include a circulation pump configured to circulate coolant between the Roots-type expander and the coolant circuit. A condenser may also be provided to condense the coolant leaving the Roots-type fluid expander at least down to a saturated liquid. 1. A power generation system including:a. an internal combustion engine having a crankshaft;b. a coolant circuit extending through the internal combustion engine, the coolant circuit including a radiator and a coolant pump configured to circulate the coolant between the internal combustion engine and the radiator; i. a Roots-type fluid expander being configured to generate power at an output shaft by expanding a portion of the coolant and being configured to deliver the power back to the internal combustion engine crankshaft via the output shaft;', 'ii. a circulation pump configured to circulate the portion of the coolant between the Roots-type expander and the coolant circuit; and', 'iii. a condenser configured to condense the portion of the coolant leaving the Roots-type fluid expander at least down to a saturated liquid., 'c. a waste heat recovery circuit including2. The power generation system of claim 1 , wherein the waste heat recovery circuit is configured such that the circulation pump draws the portion of the coolant after the portion of ...

Sintering a Multi-lobed Helical Rotor

The present disclosure relates to a method and system for manufacturing a multi-lobed helical rotor. The method for manufacturing a multi-lobed helical rotor may comprise mixing one or more powdered metals, compacting a mixture of one or more powdered metals to form a solid metal piece, sintering the solid metal piece, and polishing the solid metal piece. The system may comprise a positive displacement pump, which may comprise a casing, a multi-lobed helical rotor disposed in the casing, wherein the multi-lobed helical rotor comprise sintered powdered metals, an inlet to the casing, and an outlet leading from the casing. 1. A method for manufacturing a multi-lobed helical rotor comprising:mixing one or more powdered metals;compacting a mixture of the one or more powdered metals to form a solid metal piece;sintering the solid metal piece; andpolishing the solid metal piece.2. The method of claim 1 , further comprising choosing the one or more powdered metals as the base material for the multi-lobed helical rotor.3. The method of claim 1 , further comprising choosing the one or more powdered metals and at least one additive as the base material for the multi-lobed helical rotor.4. The method of claim 1 , wherein the step of mixing comprises combining the one or more powdered metals with at least one additive.5. The method of claim 1 , wherein the step of compacting comprises adding the at least one powdered metal and at least one additive to a die.6. The method of claim 5 , wherein the step of compacting comprises compacting the at least one powdered metal and at least one additive with a hydraulic ram.7. The method of claim 6 , wherein the step of compacting the at least one powdered metal and the at least one additive with a hydraulic ram forms the multi-lobed helical rotor.8. The method of claim 7 , wherein the step of sintering comprises placing the multi-lobed helical rotor in a furnace.{'claim-ref': {'@idref': 'CLM-00008', 'claim 8'}, 'The method of , wherein ...

TRANSFER ASSEMBLY FOR ATTACHMENT TO A FRONT PORTION OF AN AGRICULTURAL VEHICLE AND A METHOD OF USE

A transfer assembly for attachment to a front portion of an agricultural vehicle, i.e. forage harvester, and a method of use are disclosed. The transfer assembly includes a frame, a pump and an air compressor, along with appropriate drive mechanisms. The agricultural vehicle has an engine and drive mechanisms including a first driven pulley. The pump is connected to the first driven pulley through second and third driven pulleys. The pump is secured to the frame and has a fluid inlet and a fluid outlet. A transfer pipe routes the fluid or manure away from the pump and has a coupling connected to its second end. The coupling enables a flexible hose to be attached to it so that the fluid or manure can be directed to another location, such as onto a field. The transfer assembly also includes a control mechanism for operating the pump, air compressor, etc. 1. A transfer assembly for an agricultural vehicle , said agricultural vehicle having an engine equipped to deliver at least 250 horsepower , a drive pulley , a first driven pulley , and a rotatable belt , said rotatable belt connecting said engine to said drive pulley , connecting said drive pulley to said first driven pulley and connecting said first driven pulley to said engine , said transfer assembly comprisinga) a frame removably secured to a front portion of said agricultural vehicle, said frame having a first member spaced apart from a second member, each of said first and second members having an upper arm, a lower arm and a connecting arm joining said upper and lower arms together, and at least one cross member securing said first member to said second member;b) a rotatable cross shaft positioned between said upper arms of said first and second members, said rotatable cross shaft having a first end axially connected to said first driven pulley, said rotatable cross shaft located outward of said first member, and said rotatable cross shaft having a second end;c) a second driven pulley located outward of said ...

TRANSMISSION STRUCTURE OF MOTOR CONNECTION OF ROOTS PUMP

A transmission structure of motor connection of roots pump comprises a shaft sleeve, a motor shaft cavity is opened inside the shaft sleeve, and the inner circle of the motor shaft cavity is concentrically meshed with the excircle of the motor shaft; a fixed bolt mounting cavity is opened on the outer surface of the shaft sleeve, a bolt through-hole is opened in the fixed bolt mounting cavity, the shaft sleeve is fixedly connected with the gear seat through a hexagon bolt, and the gear seat and the shaft sleeve rotate synchronously at the same shaft center; a gear is fixedly connected with the gear seat with a bolt, the gear seat is fixed to the pump shaft through a first keyway under the fitting between the first keyway and a first shaft key, and the pump shaft and the motor shaft are coaxially arranged at the center. The utility model overcomes the disadvantages of the prior art, which is convenient to install without wearing parts, not affected by temperature, pressure and external dust; and the structure is simple with compound seal and oil protection function; and when a motor with a motor shaft is selected, only the diameter and keyway of the motor shaft cavity of the part are required to fit the new motor. 111122123419416561766383. A transmission structure of motor connection of roots pump comprising a shaft sleeve () , is characterized in that: the shaft sleeve () is movably connected inside the motor connecting base () , a motor shaft cavity () is opened inside the shaft sleeve () , and the inner circle of the motor shaft cavity () is concentrically meshed with the excircle of the motor shaft (); a fixed bolt mounting cavity () is opened on the outer surface of the shaft sleeve () , a bolt through-hole () is opened in the fixed bolt mounting cavity () , the shaft sleeve () is fixedly connected with the gear seat () through a hexagon bolt () , and the gear seat () and the shaft sleeve () rotate synchronously at the same shaft center; a gear () is fixedly ...

ARRANGEMENT FOR SPECIFYING A PRESSURE

An arrangement () for specifying the pressure (), produced by a pump () driven by an electric motor (), includes a processor () which derives a target pressure value () from an internal torque value () and a loss torque (). The arrangement () further derives () the internal torque value () from a motor current value () and a motor constant k. 1100643031. An apparatus () for specifying pressure () generated by a pump () driven by an electric motor () , said apparatus comprising:{'b': 112', '114', '110, 'a first upstream processor () which calculates an internal torque value (), as a function of a motor current value () and a motor constant (ke), and'}{'b': 116', '118', '114', '108, 'a downstream processor () which calculates a target pressure value (), as a function of a difference between said internal torque value () and a loss torque value ().'}2109108104106. Apparatus according to claim 1 , further comprising a second upstream processor () which calculates said loss torque value () as a function of a temperature value () and a motor RPM value ().3109102108. Apparatus according to claim 1 , wherein said second upstream processor () uses a performance characteristic matrix () in calculating said loss torque value ().4109102108. Apparatus according to claim 2 , wherein said second upstream processor () uses a performance characteristic matrix () in calculating said loss torque ().5. Apparatus according to claim 1 , wherein{'b': '30', 'said pump is a displacement pump ().'}6. Apparatus according to claim 2 , wherein{'b': '30', 'said pump is a displacement pump ().'}7. Apparatus according to claim 3 , wherein{'b': '30', 'said pump is a displacement pump ().'}8. Apparatus according to claim 1 , wherein{'b': '30', 'said pump is an internal gear pump ().'}9. Apparatus according to claim 2 , wherein{'b': '30', 'said pump is an internal gear pump ().'}10. Apparatus according to claim 3 , wherein{'b': '30', 'said pump is an internal gear pump ().'}11. Apparatus according to ...

INTERNAL COMBUSTION ENGINE HAVING AT LEAST ONE CRANKCASE OF THE DRY-SUMP TYPE

An internal combustion engine having at least one crankcase for defining a guide housing in which at least one crankshaft is guided in rotation about an axis of rotation and lubricated by a lubricating fluid, the at least one crankcase being of the “dry-sump” type. Such an internal combustion engine has at least two pumps forming a pump train of pumps on a common axis, the pump train being fitted in a cylindrical bore of the at least one crankcase. 1. An internal combustion engine having at least one crankcase for defining a guide housing in which at least one crankshaft is guided in rotation about an axis of rotation and lubricated by a lubricating fluid , the at least one crankcase being of the “dry-sump” type , such an internal combustion engine comprising:a tank of lubricating fluid separate from the at least one crankcase;at least two pumps forming a pump train of pumps on a common axis and serving to pump a mixture formed by the lubricating fluid and gas at least from the at least one crankcase, the at least two pumps each respectively comprising an inner lobe rotor and an outer lobe rotor, the inner lobe rotor being rotatable about a first axis of rotation and the outer lobe rotor being rotatable about a second axis of rotation parallel to the first axis of rotation, each inner lobe rotor of the pump train being driven in rotation by a common drive shaft rotatable about the first axis of rotation, each outer lobe rotor of the pump train being driven in rotation by an inner lobe rotor of the pump train, and the pump train being fitted in a cylindrical bore of the at least one crankcase, the cylindrical bore having an axis coinciding with the second axis of rotation and distinct from the first axis of rotation; andat least one pipe enabling the at least one crankcase to be put into fluid flow communication with the at least two pumps and the tank of lubricating fluid;wherein the common drive shaft comprises a driving inner shaft and a hollow outer shaft driven ...

Twin rotor devices with internal clearances reduced by a coating after assembly, a coating system, and methods

A method of treating, tuning, assembling, and/or overhauling a twin rotor device includes applying a coating material on an internal set of working surfaces of the twin rotor device when at least partially assembled. The coating may be factory or field applied to a new or used twin rotor device. The working surfaces may be uncoated or previously coated and may be built-up as the coating material forms a coating on at least some of the working surfaces. Manufacturing variations of a pair of rotors and a housing may be compensated by the coating. One or more performance characteristics of the twin rotor device may be improved by the coating, and variation between a series of twin rotor device may be reduced or substantially eliminated. The coating may reduce internal leakage and increase volumetric efficiency of the twin rotor device. The twin rotor device may be a supercharger 200, a screw compressor 1200, or other twin rotor device.

HIGH-VISCOSITY FIRE SUPPRESSANT DELIVERY SYSTEM USING AN INJECTION QUILL

A system for delivering an additive into a fluid stream is disclosed that addresses the issues of delivering a pressurized stream of a shear thickening or dilatant material which is commonly used for fire suppression. The system uses a positive displacement pump that is controlled to deliver the additive to a fluid stream in the correct ratio according to fluid flow rates. The system also incorporates an injection quill for delivering the additive to the fluid stream within a dispensing line. The injection quill includes an internal extension within its valve chamber, and the internal extension provides ports that allow for improved fluid flow of dilatant material. 1. A system for delivering an additive into a fluid stream , the system comprising:a positive displacement pump coupled to an additive source containing the additive, the positive displacement pump to pump the additive through an additive dispensing line into an injection quill coupled to a fluid dispensing line;a variable speed motor coupled to the positive displacement pump to drive the positive displacement pump;a flow meter coupled to the fluid dispensing line prior to the injection quill to determine the fluid flow rate; anda controller coupled to the flow meter and the variable speed motor to control a rate of injection from the additive injecting line into the fluid dispensing line by controlling the variable speed motor according to the fluid flow rate from the flow meter.2. The system of wherein the injection quill comprises a check valve to prevent backflow into the additive dispensing line.3. The system of wherein the check valve comprises a check valve chamber claim 2 , check valve ball claim 2 , and a spring.4. The system of wherein the injection quill comprises an extension extending into the check valve chamber claim 3 , the spring and check valve ball seated axially on the extension.5. The system of wherein the extension defines at least one aperture providing fluid coupling between the ...

PUMP MODULE AND ELECTRIC PUMP INCLUDING THE SAME

A pump module may include a pump rotor coupled to a rotating shaft of a motor, and a pump housing configured to accommodate the pump rotor. The pump housing includes a rotor accommodating part having an insertion groove formed therein to accommodate the pump rotor, and a cover connected with the rotor accommodating part and having a fluid sucking hole and a fluid discharging hole. 1. A pump module comprising:a pump rotor coupled to a rotating shaft of a motor, and a pump housing configured to accommodate the pump rotor,wherein the pump housing comprises:a rotor accommodating part having an insertion groove formed therein to accommodate the pump rotor, anda cover connected with the rotor accommodating part and having a fluid sucking hole and a fluid discharging hole.2. The pump module of claim 1 , wherein the rotor accommodating part comprises a protrusion in which a fastening member is fastened.3. The pump module of claim 1 , wherein the rotor accommodating part comprises a first groove formed in a bottom surface of the insertion groove to receive a fluid.4. The pump module of claim 1 , wherein the rotor accommodating part comprises a groove portion configured to surround the insertion groove claim 1 , and an O-ring arranged in the groove portion.5. The pump module of claim 1 , wherein the rotor accommodating part comprises an insertion hole formed at a center of a bottom surface of the insertion groove.6. The pump module of claim 1 , wherein the pump rotor comprises an internal rotor coupled to the rotating shaft claim 1 , and an external rotor configured to accommodate the internal rotor.7. An electric pump comprising:a motor module including a rotating shaft, a rotor coupled to an outer circumferential surface of the rotating shaft, a stator configured to accommodate the rotor, and a motor housing configured to accommodate the rotor and the stator; anda pump module including a pump rotor coupled to one end of the rotating shaft, and a pump housing configured to ...

FLUID WORKING SYSTEMS

A fluid working system such as a pump for displacing a working fluid such as hydraulic fluid or a motor using a working fluid is provided. The system may have a positive displacement machine which includes one or more working chamber with displacement means such as a cylinder with a reciprocating piston. There are also two or more fluid ports to allow the working fluid to flow into and out of the working chamber. The working fluid flows from one fluid port means to another either being forced to do so when pumped or moving the piston when functioning as an engine. The fluid working system has associated therewith a non-dead compliance volume of a material such as syntactic foam. This compliance volume acts to smooth any pressure fluctuations within the working fluid system. 121-. (canceled)22. A fluid working system for a working fluid including a positive displacement machine ,said positive displacement machine comprising:at least one working chamber and, at least two, fluid port means allowing working fluid to flow into and out of said working chamber,displacement means within, or defined by, said working chamber to displace, or be actuated by, working fluid from one fluid port means to another,wherein the fluid working system has associated therewith a compliance volume smoothing pressure fluctuations of said working fluid within said fluid working system.23. The fluid working system for a working fluid including a positive displacement machine as claimed in wherein said fluid port means comprises valves operable to be individually opened and closed at a selected rate.24. The fluid working system for a working fluid including a positive displacement machine as claimed in wherein the compliance volume is housed within the working chamber.25. The fluid working system for a working fluid including a positive displacement machine as claimed in wherein the compliance volume is housed within the displacement means.26. The fluid working system for a working fluid ...

SIMPLIFIED ROOTS-TYPE BLOWER

The present disclosure relates to a simplified roots-type blower having an improved sound signature. The roots-type blower includes a rotor bore housing having a molded, one-piece polymeric construction. The rotor bore housing defines a first rotor bore and a second rotor bore. The rotor bore housing also defines a first bearing pocket corresponding to the first rotor bore and a bearing pocket corresponding to the second rotor bore axis. The rotor bore housing further defining a timing gear chamber. 1. A Roots blower comprising:a rotor bore housing having a molded, one-piece polymeric construction to define a full thickness of the housing, defining a first rotor bore with a first inner surface formed by the polymeric construction and defining a second rotor bore with a second inner surface formed by the polymeric construction;a first Roots rotor having a first rotor shaft aligned along a first rotor axis and a second Roots rotor having a second rotor shaft aligned along a second rotor bore axis, the first and second Roots rotors being respectively positioned within the first and second rotor bores, the first and second Roots rotors being rotatable relative to the rotor bore housing about their respective first and second rotor axes, the first and second rotor bore axes being relatively positioned such that the first and second Roots rotors intermesh with one another when the first and second Roots rotors are rotated about their respective first and second rotor axes, the first rotor shaft being supported by the first bearing and the second rotor shaft being supported by the second bearing.2. The Roots blower of claim 1 , wherein the first and second rotor bores each have a draft angle less than 2 degrees.3. The Roots blower of claim 1 , wherein the first and second rotor bores each have a draft angle equal to zero.4. The Roots blower of claim 1 , wherein the molded polymeric construction includes a polymeric base material and reinforcing fibers embedded within the ...

TWIN ROTOR DEVICES WITH INTERNAL CLEARANCES REDUCED BY A COATING AFTER ASSEMBLY, A COATING SYSTEM, AND METHODS

A method of treating, tuning, assembling, and/or overhauling a twin rotor device () includes applying a coating material () on an internal set of working surfaces () of the twin rotor device when at least partially assembled. The coating may be factory or field applied to a new or used twin rotor device. The working surfaces may be uncoated or previously coated and may be built-up as the coating material forms a coating () on at least some of the working surfaces. Manufacturing variations of a pair of rotors () and a housing () may be compensated by the coating. One or more performance characteristics of the twin rotor device may be improved by the coating, and variation between a series of twin rotor device may be reduced or substantially eliminated. The coating may reduce internal leakage and increase volumetric efficiency of the twin rotor device. The twin rotor device may be a supercharger , a screw compressor , or other twin rotor device. 12001200. A method of treating a twin rotor device ( , ) , the method comprising:{'b': 220', '1220', '210', '1210', '202', '204', '1202', '1204', '204', '202', '1204', '1202', '218', '222', '224', '226', '228', '1218', '1222', '1224', '1226', '1228, 'providing the twin rotor device, the twin rotor device including a pair of rotors (, ) and a housing (, ) with a first port (, , , ) and a second port (, , , ), the rotors and the housing defining a set of working surfaces (, , , , , , , , , ) adapted to interface with each other; and'}{'b': 102', '206', '1206, 'inducing a coating material () to flow from the first port toward the second port of the housing and thereby depositing at least some of the coating material as a coating (, ) on at least some of the working surfaces.'}220212022041204. The method of claim 1 , wherein the first port is an inlet ( claim 1 , ) of the twin rotor device and wherein the second port is an outlet ( claim 1 , ) of the twin rotor device.320412042021202. The method of claim 1 , wherein the first port ...

ROTOR SET

A rotor set comprises a pair of engaging rotors disposed in a pump room of a housing rotating oppositely with identical speeds. Each rotor comprises a plurality of lobes, and each lobe has a fan-shaped end with a curved edge. The lobe generates an eccentric force to the rotor during the rotation to reduce mechanical consuming energy and save dynamic energy. Therefore, the rotors can achieve strong eccentric torque and self-vacuum effect with low dynamic energy. 1. A rotor set comprising a pair of engaging rotors disposed in a pump room of a housing rotating oppositely with identical speeds , each rotor comprising a plurality of lobes , each lobe having a fan-shaped end with a curved edge.2. The rotor set as claimed in claim 1 , wherein the fan-shaped end of each lobe has a first blunt end and a second sharper end.3. The rotor set as claimed in claim 1 , wherein an outer portion of the curved edge of each lobe is provided with a plurality of longitudinal slots.4. The rotor set as claimed in claim 1 , wherein each lobe has a plurality of balance positioning apertures.5. The rotor set as claimed in claim 4 , wherein each balance positioning aperture is provided with an inner thread.6. The rotor set as claimed in claim 1 , wherein a shaft hole of each rotor is provided with a pin slot on a sidewall corresponding to each lobe and configured to engage with a transmission shaft. 1. Field of the InventionThe invention relates to a rotor set, and in particular to a pump rotor which providing high efficiency low noise and less vibration.2. Description of Prior ArtAs shown in . A conventional roots rotor set has a pair of engaging rotors , and the two rotors are disposed in a pump room defined by a housing . The pump room has an inlet at one side and an outlet at another side. The rotor is respectively connected to a transmission shaft , and the transmission shaft drives the two rotor in the pump room to make rotation with equal speed in opposite directions.However, the ...

LOBE GEAR PUMP

A high speed, rotary lobe gear pump assembly is provided which combines a positive displacement lobe gear pump having wipers with a centrifugal pump utilizing an impeller. The centrifugal pump feeds high pressure fluid flow directly into the lobe gear pump allowing the gear pump to rotate at high speeds without cavitation. The high speed capability of the pump assembly allows the lobe gear pump to operate without speed reduction gearing for the motor shaft. 1. A pump assembly comprising:a first housing having an interior chamber, an inlet, and an outlet;a first rotor and a second rotor, each rotor having a plurality of lobes, the first rotor and second rotor rotatable within the interior chamber of the first housing;a timing gear associated with the first and second rotor which causes the rotors to mesh upon rotation without contacting each other;a wiper insert interconnected to each of the plurality of lobes of each rotor, each wiper insert being depressibly radially biased outward from the lobe of the rotor such that the wiper can contact the at least one of the other rotor and the interior chamber of the first housing upon rotation of the rotors;a second housing attached to the first housing and having an interior chamber, an inlet, and an outlet fluidly connected to the inlet of the first housing;an impeller rotatable within the interior chamber of the second housing.2. The pump assembly of claim 1 , further comprising:a third housing having an interior chamber, an inlet, and an outlet, the outlet of the third housing fluidly connected to the inlet of the second housing, and an inducer rotatable within the interior chamber of the third housing.3. The pump assembly according to claim 1 , wherein a centerline through the inlet and the outlet of the first housing is generally perpendicular to the inlet of the second housing.4. The pump assembly of any one of further comprising:a first drive shaft driven by the drive motor;a first timing gear of the timing gear, the ...

HOLLOW ROTOR LOBE AND CONTROL OF TIP DEFLECTION

A rotor comprises a central body configured to rotate. A lobe extends perpendicularly from the central body along an lobe axis. A curved leading periphery and a curved trailing periphery are on opposite sides of the lobe axis. A V-shaped rib spans between the curved leading periphery and the curved trailing periphery. A first hollow space is bounded by the V-shaped rib, the curved leading periphery, and the curved trailing periphery. The first hollow space is distal with respect to the central body along the lobe axis. A second hollow space is bounded by the V-shaped rib, the central body, the curved leading periphery, and the curved trailing periphery. The second hollow space is proximal with respect to the central body along the lobe axis. The rotor can comprise a plurality of stacked, stamped sheets to form a helically twisted supercharger rotor. 1. A rotor comprising:a central body configured to rotate; a curved leading periphery on a first side of the lobe axis;', 'a curved trailing periphery on a second side of the lobe axis;', 'a V-shaped rib spanning between the curved leading periphery and the curved trailing periphery;', 'a first hollow space bounded by the V-shaped rib, the curved leading periphery, and the curved trailing periphery, the first hollow space distal with respect to the central body along the lobe axis; and', 'a second hollow space bounded by the V-shaped rib, the central body, the curved leading periphery, and the curved trailing periphery, the second hollow space proximal with respect to the central body along the lobe axis., 'a lobe extending from the central body, the lobe comprising: an lobe axis perpendicular to the central body;'}2. The rotor of claim 1 , wherein the V-shaped rib comprises: periphery distal with respect to the central body along the lobe axis; and a second arm extending from the vertex to connect to the curved trailing', 'periphery distal with respect to the central body along the lobe axis., 'a vertex proximal with ...

MOTOR-DRIVEN ROOTS PUMP

A rotor-chamber wall of a motor-driven Roots pump has a suction port and a discharge port. The side on which the discharge port is located with respect to a plane that includes both the rotational axis of a drive shaft and the rotational axis of a driven shaft is a first side. A first partition wall defines a gear chamber and has a first recess on the first side. A second partition wall defines the gear chamber and has a second recess. The first partition wall has a first oil supply passage that is configured to supply oil from the first recess to a first seal accommodating recess. The second partition wall has a second and a third oil supply passages. The second and the third oil supply passages are configured to supply oil from the second recess to a second and a third seal accommodating recesses, respectively. 1. A motor-driven Roots pump comprising:a housing;a drive shaft and a driven shaft that are rotationally supported by the housing in a state arranged parallel to each other in the housing;a drive gear that is fixed to the drive shaft;a driven gear that is fixed to the driven shaft and meshed with the drive gear;a drive rotor that is arranged on the drive shaft;a driven rotor that is arranged on the driven shaft and meshed with the drive rotor;an electric motor that rotates the drive shaft;a motor chamber that is formed in the housing and accommodates the electric motor;a gear chamber that is formed in the housing, accommodates the drive gear and the driven gear, and retains oil in a sealed manner; anda rotor chamber that is formed in the housing and accommodates the drive rotor and the driven rotor, whereinthe motor chamber, the gear chamber, and the rotor chamber are arranged in this order along a rotational axis of the drive shaft, a first partition wall that separates the gear chamber from the motor chamber in a direction of the rotational axis of the drive shaft,', 'a second partition wall that separates the gear chamber from the rotor chamber in the ...

Positive displacement pump with pressure relief

A rotary, self-priming, positive displacement pump is described. The pump may include a pump housing including an inlet and an outlet, a pump chamber including an upper wall, a lateral wall, and a floor, first and second rotary impellers in the pump chamber, and a pair of gears each secured to the first and second rotary impellers, and a pressure relief feature operable to relieve pressure developing in a relatively high pressure zone of the pump chamber. The gears mesh with each other to ensure that the vanes do not contact one another during rotation. The pressure relief feature may comprise one or more channels formed in the pump housing and/or the first and second rotary impellers. The channels connect the high pressure zone with another zone to redistribute pressure. The channels may include one continuous channel or alternatively, a plurality of unconnected channels. 1. A rotary positive displacement pump for pumping fluids , comprising:a pump housing including a pump chamber therein, the pump housing including a fluid inlet and a fluid outlet communicating with the pump housing, and the pump chamber has an upper wall, a lateral wall, and a floor;a first rotary impeller in the pump housing, the first rotary impeller comprising a first shaft including first shaft ends rotatably mounted in the pump housing, the first shaft including a plurality of vanes having contoured faces extending outwardly therefrom;a second rotary impeller in the pump housing, the second rotary impeller comprising a second shaft including second shaft ends rotatably mounted in the pump housing, the second shaft including a plurality of vanes having contoured faces extending outwardly therefrom;a pair of gears each secured to one of the first shaft and the second shaft of the first and second rotary impellers, wherein the gears mesh with each other and synchronize rotation of the first rotary impeller and second rotary impeller to ensure that the vanes do not contact one another during ...

Rotary Piston Pump

A rotary piston pump with at least two double- or multi-lobe rotary pistons rotating in opposite directions, the drive shafts whereof include seals, wherein the seals are constituted as slip ring seals or lip seals or stuffing-box seals, which in each case are disposed on the shaft shoulder belonging to the respective rotary piston, and one slip ring per seal is provided with a locking device, which includes a large number of fixing positions. The seals are pushed onto a tubular shoulder of the rotary piston, the rotary piston is introduced into the pump housing, the securing element is connected to the slip ring seal in a form-fit manner by rotation of the rotary piston and the shaft shoulder is then rigidly connected to the drive shaft. 1. A rotary piston pump with at least two double- or multi-lobe rotary pistons rotating in opposite directions , the drive shafts whereof comprise seals , characterised in that the seals are disposed in each case on a shaft shoulder belonging to the respective rotary piston , wherein each seal is provided with a locking device , which comprises a large number of fixing positions on the housing of the seal.2. The rotary piston pump according to claim 1 , characterised in that the locking device is a ring claim 1 , which is connected to the housing for the seals and which comprises a plurality of axial grooves running parallel to the rotary piston axis.3. The rotary piston pump according to claim 1 , characterised in that the axial grooves extend over the entire periphery of the annular locking device.4. The rotary piston pump according to claim 3 , characterised in that the axial grooves cover only a partial region of the periphery of the annular locking device preferably a partial region of 45 degrees twice.5. The rotary piston pump according to claim 3 , characterised in that the axial grooves are disposed at a uniform distance from one another on the annular locking device.6. The rotary piston pump according to claim 1 , ...

Multiple Segment Lobe Pump

Designs for multiple segment lobe pumps are shown. The designs include pumps using rotors having two lobes to a plurality of lobes and segments that include two segments to a plurality of segments. Designs for both vertical, or straight walled conventional lobed rotors, as well as helical lobe rotors are shown. The designs are applicable to a variety of rotors and number of segments. In one particular case the designs enable a three lobe helical pump. Designs are also shown for separator plates used between the multiple segments. The separator float between the pairs of lobes in a segment and can also have a fixed position between the lobes by inclusion of end pieces that enable clamping of the separator plates in position. 1. A lobe pump comprising:a) a housing forming a pump chamber, said housing having ends, an inlet and an outlet and walls, the walls having a height, an inner surface and an outer surface, and,b) end covers that removable attach to each end of the housing and thereby seal the pump chamber,c) a first shaft and a second shaft, the shafts being elongated cylinders, the first shaft extending beyond a wall of the housing such that it is rotated by a motor, the shafts fixed within the housing such that their long axes are parallel, the shafts coupled through use of timing gears affixed to a first end of each shaft such that rotation of the first shaft by the motor causes the second shaft to rotate, i) a first lobe rotor having a center, a top surface, a bottom surface, sidewalls and a plurality of lobes symmetrically extending from the center, the lobes extended at a lobe separation angle from one another, the first lobe rotor fixedly attached to the first shaft through the center of the rotor such that rotation of the first shaft causes the first lobe rotor to rotate,', 'ii) a second lobe rotor having a center, a top surface, a bottom surface, sidewalls and a plurality of lobes symmetrically extending from the center, the lobes extended at a lobe ...

TANDEM ELECTRIC PUMP

A tandem pump with a pump housing that includes a first pump portion with a first pump inlet and first pump outlet. The pump housing further includes a second pump portion having a second pump inlet and a second pump outlet. Within the pump housing is a rotatable common shaft that extends between the first and second pump portions. A first pump chamber that includes a first pump element with a first pump outer rotor surrounding a first pump inner rotor. The first pump inner rotor is connected to a first end of the common shaft. A second pump chamber has a second pump element operationally connected to a second end of the common shaft located opposite the first end of the common shaft. A stator is positioned in the first pump portion of the pump housing and circumscribes the first pump outer rotor. 1. A tandem pump comprising:a pump housing defining a first pump portion having a first pump inlet and first pump outlet, a second pump portion having a second pump inlet and a second pump outlet;a common shaft rotatably positioned in said pump housing and extending between said first pump portion and said second pump portion;a first pump chamber of said first pump portion having a first pump element with a first pump outer rotor surrounding a first pump inner rotor, wherein said first pump inner rotor is connected to a first end of said common shaft;a second pump chamber of said second pump portion having a second pump element operationally connected to a second end of the common shaft, opposite the first end of the common shaft; anda stator contained in said first pump portion of said pump housing circumscribing said first pump outer rotor, wherein said stator and said first pump outer rotor are magnetically coupled so that energization of said stator causes said first pump outer rotor to rotate and pump a first fluid through said first pump chamber between said first pump inlet and said first pump outlet, and rotation of said first pump outer rotor causes rotation of ...

ROTARY LOBE PUMP WITH WIPER BLADES

A positive displacement rotary pump with an improved impeller design integrating replaceable wiper inserts. The impeller generally has one or more lobes and an equal number of conjugate surfaces. Each lobe has an arcuate peripheral end comprising a plurality of wiper blades. Each lobe further has a facial wiper blade on each face of the lobe. The wiper blades improve efficiency by making a seal with a pump chamber or the conjugate surface on the other impeller as it rotates. The wiper blades are arranged such that constant and successive contact between wiper blades and impellers is achieved. 1. A rotary pump , comprising:a pump chamber having an interior chamber wall;a first impeller and a second impeller disposed within said pump chamber, each of said impellers comprising:a hub located substantially in the center of said first impeller and said second impeller, wherein each of said hubs rotates around a central axis of each of said impellers;a plurality of lobes extending radially outward from each of said central axes, each of said lobes having a first end and a distal end, said distal end positioned proximate to said pump chamber;said distal end comprising a substantially arcuate periphery;a substantially arcuate cut-out portion between each of said lobes on said impellers, each of said arcuate cut-out portions having a conjugate surface;each of said lobes comprising a plurality of wiper inserts, wherein each of said wiper inserts operatively engages a conjugate surface when each of said distal ends of each of said lobes is proximate to each of said conjugate surfaces;wherein said plurality of wiper inserts are radially distributed about said substantially arcuate periphery such that at least one of said wiper inserts is in contact with at least one of said impellers throughout rotation of said impellers;each of said lobes further comprising at least a first and second facial wiper insert;said first facial wiper inserts extending outwardly and substantially ...

PUMP FOR DISPENSING LIQUID OR SEMI-LIQUID OR SEMI-SOLID FOOD PRODUCTS AND MACHINE COMPRISING SAID PUMP

A pump for dispensing semi-liquid food products, which comprises an inlet opening, an outlet opening, a dispensing path between the inlet opening and the outlet opening, a rotor for pushing the product along the dispensing path, and an airtight chamber, which is interposed between the inlet and outlet openings and coaxially contains the rotor; the dispensing path is defined by the cyclically choked gap formed between the outer periphery of the rotor, equipped with three projecting and angularly equidistant lobes and the inner periphery of the chamber, which is elastically deformable. 1. A pump for dispensing semi-liquid food products , comprising an inlet opening , an outlet opening , a dispensing path between the inlet opening and the outlet opening and a rotor for pushing the product along the dispensing path; the pump being wherein it comprises an airtight chamber interposed between the inlet and outlet openings and contains the rotor; the dispensing path being defined by the gap formed between the outer periphery of the rotor and the inner periphery of the chamber; the inner periphery of the chamber being elastically deformable and the outer periphery of the rotor having at least one protruding portion adapted to sealedly engage the inner periphery of the chamber in order to cyclically choke the gap.2. The pump according to claim 1 , wherein the chamber is externally enclosed by two rigid half-shells which are sealedly coupled to each other.3. The pump according to claim 2 , wherein the half-shells house two facing elastomeric elements which delimit a substantially cylindrical central cavity and which define the elastically deformable inner periphery of the chamber which is sealedly engaged by the outer periphery of the rotor.4. The pump according to claim 3 , wherein the two elastomeric elements are C shaped.5. The pump according to claim 3 , wherein the two elastomeric elements are housed symmetrically inside one of the two half-shells.6. The pump according to ...

Rotary Piston Pump, Method For Fixing Rotary Pistons Of A Rotary Piston Pump And Method For Dismantling Rotary Pistons Of A Rotary Piston Pump

A method for fixing rotary pistons in a rotary piston pump and a method for dismantling rotary pistons of a rotary piston pump, where the rotary piston pump has two counter-rotating rotary arranged in a pump space on drive shafts. The rotary pistons each include a seating for the drive shafts. The respective drive shaft is arranged and fixed with an end region in the seating of the respective rotary piston. A diameter of the drive shafts in the end region can be widened elastically. In an operational state, in which the rotary pistons are arranged on the respective drive shafts, a frictional connection is formed between the respective seating of the rotary piston and the end region of the respective drive shaft.

FLUID WORKING SYSTEMS

A fluid working system such as a pump for displacing a working fluid such as hydraulic fluid or a motor using a working fluid is provided. The system may have a positive displacement machine which includes one or more working chamber with displacement means such as a cylinder with a reciprocating piston. There are also two or more fluid ports to allow the working fluid to flow into and out of the working chamber. The working fluid flows from one fluid port means to another either being forced to do so when pumped or moving the piston when functioning as an engine. The fluid working system has associated therewith a non-dead compliance volume of a material such as syntactic foam. This compliance volume acts to smooth any pressure fluctuations within the working fluid system. 1. A fluid working system for a working fluid including a positive displacement machine , said positive displacement machine comprising:at least one working chamber and, at least two, fluid port means allowing working fluid to flow into and out of said working chamber,displacement means within, or defined by, said working chamber to displace, or be actuated by, working fluid from one fluid port means to another,wherein the fluid working system has associated therewith a compliance volume smoothing pressure fluctuations of said working fluid within said fluid working system.2. The fluid working system for a working fluid including a positive displacement machine as claimed in claim 1 , wherein said fluid port means comprises valves operable to be individually opened and closed at a selected rate.3. The fluid working system for a working fluid including a positive displacement machine as claimed in claim 1 , wherein the compliance volume is housed within the working chamber.4. The fluid working system for a working fluid including a positive displacement machine as claimed in claim 3 , wherein the compliance volume is housed within the displacement means.5. The fluid working system for a working ...

Rotary piston pump for pumping liquid manure or the like

Rotary piston pump for pumping a material interspersed with foreign bodies, such as liquid manure or the like, in which pump, in a casing (10), two rotary pistons (14) which roll on one another and which counter-rotate are fastened on two mutually parallel shafts (12) and in which, the inner wall of the casing (10), in order to compensate for wear and to take up play, can be moved radially with respect to the axis of the associated rotary piston (14). <IMAGE>

Rotary piston pump has pair of oppositely driven pistons in housing which has fluid inlet and outlet openings with wider angles for faster filling and less cavitation

The rotary piston pump has a pair of oppositely driven rotary pistons mounted in an oval pump housing (10) rotationally secured on support shafts (11). The support shafts have vanes (12) seated on a metal core and covered with an elastomer material and positioned relative to one another so that they can pick up fluid with solids from an inlet opening (13) and after turning 180 degrees can discharge it through an outlet opening (14). The inlet opening widens out beyond 90 degrees at least in the lower area. The geometry of the housing can be modified on both sides so that the inlet and outlet can be interchanged and the pump can be used irrespective of the rotational direction of the piston.

Device for filling optimization in rotary lobe pumps

Drehkolbenpumpe für die Förderung von Feststoffen enthaltenden Flüssigkeiten, mit einem Paar von in einem im Querschnitt im wesentlichen ovalen Pumpengehäuse (10) gegensinnig drehend angetriebenen und verdrehfest auf je einer Trägerwelle (11) aufgesetzten Drehkolben, die jeweils in die Zwischenräume des anderen Drehkolben eingreifende Flügel (12) aufweisen und aus einem metallischen Kern und einer Auflage aus einem elastomeren Werkstoff bestehen, wobei die Auflagen jeweils bei der Drehung der Drehkolben dichtend an der Innenseite der Wandung des Pumpengehäuses und an dem anderen Drehkolben umlaufen und mit einer Einlass- und einer Auslassöffnung (13, 14), dadurch gekennzeichnet, dass mindestens die Einlassöffnung einen über 90° hinausgehend erweiterten Gehäuse-Halbwinkel (α+ Δα) und zwar zumindest im unteren Bereich der Öffnung aufweist, wobei die Erweiterung ca. 22,5° beträgt und eine Rampe im Einlassbereich vorgesehen ist, die die Fremdkörper in die Zahnlücke fördert. Rotary pump for the Promoting Solids containing liquids, with a pair of in a cross-section substantially oval pump housing (10) driven in opposite directions rotationally and rotationally on one each carrier wave (11) mounted rotary pistons, each in the interstices of the have other rotary piston engaging wings (12) and off a metallic core and an elastomeric pad Material exist, wherein the conditions in each case during the rotation of the Rotary piston sealing on the inside of the wall of the pump housing and rotate on the other rotary piston and with an inlet and a outlet (13, 14), characterized in that at least the inlet opening extended beyond 90 ° Housing half angle (α + Δα) and that at least in the lower region of the opening, wherein the Extension is about 22.5 ° and one Ramp is provided in the inlet area, which is the foreign body in promotes the tooth gap.

Electric oil pump, in particular for a motor vehicle

The invention relates to an oil pump (1), in particular an electric or electromotive auxiliary pump for a motor vehicle, comprising a housing (2) having an inlet (15) on the admission side and an outlet (16) on the pressure side, in addition to a pump rotor (11) which is inserted in the housing such that it can rotate about an axis (), and comprising at least one rotor part (11a, 11b), a flexible housing component which is in the form of an elastic press plate (20) and which extends over the cross-sectional surface of the pump rotor (11). Said flexible pressure plate (20) is maintained, in an advantageous manner, in the edge area (20b) of the second housing parts (2a, 2b).

Dual rotor flow meter

A positive displacement flow meter includes a pair of smooth oval shaped rotors mounted to a pair of spaced apart rotatable shafts contained within a sealed housing. The rotatable shafts penetrate the measuring chamber and have a pair of toothed, oval shaped timing gears located in a separate gear cavity chamber which are responsible for synchronizing and maintaining the relative orientation of the smooth faced rotors with respect to one another. The fluid that is being metered forms seals between the rotating surfaces of the rotors, as well as between the rotors and the wall of rotor chamber, thus the inlet and outlet plenums are physically isolated and are consequently not in direct communication at any point during the rotation cycle of the rotors. Thus, each rotation of the rotors results in the transport of a precise and known volume of fluid from the inlet plenum to the outlet plenum. A magnetic sensing/counting system, which includes an magnetic actuator attached to one of the rotor shafts and a magnetic sensor mounted to the flow meter housing, monitors the rotation rate of the rotors and hence the flow rate of the fluid passing through the meter.

Controller/encoder synchronised rotary lobe pump

The rotary-piston pump of the entrance and exit with optimization

本发明涉及一种用于输送液体和用于输送包含固体的液体的旋转式活塞泵。该旋转式活塞泵包括泵壳体，其设有入口和出口。泵壳体包括衬套。至少两个反向旋转的旋转活塞设置于泵壳体内或者衬套内，所述旋转活塞在其旋转过程中形成泵空间。在旋转运动过程中，旋转活塞相对于彼此、相对于泵壳体以及相对于衬套密封。通过其可减少或者甚至完全避免脉动的装置设置于泵壳体内和/或衬套内、在空间上在入口和/或出口附近。

Electric Pump

본 발명은 하우징과, 상기 하우징에 삽입되는 회전축과, 상기 회전축의 외주면에 배치된 로터 코어, 및 상기 로터 코어가 수용되는 스테이터 코어를 포함하는 모터부; 및 상기 회전축의 일 끝단에 결합되는 내부 로터, 및 외부 로터를 포함하는 펌프부;를 포함하되, 상기 하우징의 일측면에는 상기 펌프부가 수용되는 삽입홈이 형성되어, 상기 하우징 내에 상기 모터부와 펌프부가 수용되는 전동 펌프를 개시한다.

Metering cap

A metering cap in which a first component of a flowable material is squeezed out of a cartridge (C) which can be emptied by means of a press (P). The main component flows through a feed line (8) to an outlet line (11) and, in the process, drives two rotors (31) seated in a metering chamber (9) in a housing (1). Gear wheels (34) are seated on the shafts (30) of the rotors (31), which mesh with each other and, in this way, form a gear pump (24). The gear pump (24) conveys an admixing component from an integrated container (18) through a second feed line (23) into the outlet line (11). At least two components can be admixed in a metered manner in an extremely exact ratio to each other by the metering cap of this invention.

Rotary lobe pump with internal bearing

Drehkolbenpumpe zur Förderung eines partikelbeladenen Fördermediums, umfassend- ein Pumpengehäuse mit einem Pumpenraum,- eine Einlass- und eine Auslassöffnung,- einen ersten, mehrflügeligen Drehkolben, der in dem Pumpenraum angeordnet und um eine erste Rotationsachse drehbar gelagert ist,- einen zweiten in dem Pumpenraum angeordneten mehrflügeligen Drehkolben, der um eine von der ersten Rotationsachse beabstandete zweite Rotationsachse drehbar gelagert ist und in den ersten Drehkolben kämmend eingreift,- wobei der erste und der zweite Drehkolben gegenläufig antreibbar sind und ausgebildet sind, um durch gegenläufige Rotation um die erste bzw. zweite Rotationsachse eine Strömung des Fördermediums von der Einlassöffnung durch den Pumpenraum zu der Auslassöffnung zu erzeugen,- eine Antriebsvorrichtung, welche mechanisch mit den Drehkolben gekoppelt ist zum Antreiben der Drehkolben, gekennzeichnet durch- einen mit dem Pumpengehäuse verbundenen ersten feststehenden Achskörper, der innerhalb des ersten Drehkolbens angeordnet ist, und- mindestens ein erstes Lager zur drehbaren Lagerung des ersten Drehkolbens um den ersten feststehenden Achskörper, wobei das Lager auf einer äußeren Oberfläche des ersten feststehenden Achskörpers und innerhalb des ersten Drehkolbens angeordnet ist. Rotary lobe pump for conveying a particle-laden conveying medium, comprising - a pump housing with a pump chamber, - an inlet and an outlet opening, - a first, multi-bladed rotary piston, which is arranged in the pump chamber and is rotatably mounted about a first axis of rotation, - a second one in the pump chamber arranged multi-vane rotary piston, which is rotatably mounted about a second axis of rotation spaced from the first axis of rotation and meshingly engages in the first rotary piston, - wherein the first and second rotary pistons can be driven in opposite directions and are designed to rotate in opposite directions about the first and second, respectively Axis of rotation to generate a ...

Volumetric pump using a nasolabial rotor

Provided in the present invention is a positive-displacement pump using a figure-of-eight rotor, which is characterized by comprising: a pump housing (100) in which a pair of cylindrical pumping chambers (120) are partially overlapped to form an intersection area (130), and inlet and outlet ports (102, 104) are provided at both side walls corresponding to the intersection area (130); and a pair of figure-of-eight rotors (200, 200') which are respectively accommodated in the pumping chambers (120) of the pump housing (100) to be rotated in the reverse direction from each other by a connection operating means (300). Therefore, according to the positive-displacement pump using a figure-of-eight rotor, the damage of a pump caused by the excessive increase of the pressure within the pump can be prevented. Furthermore, the excessively discharged pressure can be efficiently managed to be returned. Consequently, a single pump can uniformly control the discharge pressure without being affected by the viscosity of fluid, the concentration thereof, and the content of sludge therein.

Electric Pump

Disclosed is an electric pump. The electric pump includes a housing; a motor unit which includes a rotating shaft inserted into the housing, a rotor core arranged on the outer peripheral surface of the rotating shaft, and a stator core accommodating the rotor core; a pump unit which includes an external core and an internal core coupled to an end of the rotating shaft; and a first cover coupled to a side surface of the housing. An insertion groove is formed on the side surface of the housing to accommodate the pump unit, and the first cover is coupled to the side surface of the housing to seal the pump unit.

Rotary piston pump with optimised inlets and outlets

본 발명은 유체의 전달 및 고체를 함유한 유체의 전달을 위한 회전식 피스톤 펌프에 관한 것이다. 회전식 피스톤 펌프는 유입구와 배출구가 마련된 펌프 하우징으로 이루어진다. 펌프 하우징은 라이닝을 가진다. 회전 중에 피스톤 공간을 형성하는 것으로, 반대방향으로 회전하는 적어도 두 개의 회전식 피스톤이 펌프 하우징 또는 라이닝의 내부에 배열된다. 회전 이동 중에 피스톤은 서로에 대해, 그리고 펌프 하우징 및 라이닝에 대해 밀폐된다. 펌프 하우징 및/또는 라이닝에는, 맥동을 저감하거나 심지어는 완전히 제거할 수 있는 수단이 유입구 및/또는 배출구에 공간적으로 근접하게 배열된다.

Positive displacement pump with pressure relief

A rotary, self-priming, positive displacement pump is described. The pump may include a pump housing including an inlet and an outlet, a pump chamber including an upper wall, a lateral wall, and a floor, first and second rotary impellers in the pump chamber, and a pair of gears each secured to the first and second rotary impellers, and a pressure relief feature operable to relieve pressure developing in a relatively high pressure zone of the pump chamber. The gears mesh with each other to ensure that the vanes do not contact one another during rotation. The pressure relief feature may comprise one or more channels formed in the pump housing and/or the first and second rotary impellers. The channels connect the high pressure zone with another zone to redistribute pressure. The channels may include one continuous channel or alternatively, a plurality of unconnected channels.

Rotary pump

Drehkolbenpumpe für inhomogene Flüssigkeiten, insbesondere Gülle, mit einem Gehäuse mit einer Einlassöffnung und einer Auslassöffnung, in dessen Innenraum vier zusammenwirkende Drehkolben für einen gegenläufigen Umlauf zur Förderung der Flüssigkeit von der Gehäuseeinlass- zur Gehäuseauslassöffnung auf zwei Wellen untergebracht sind. Der Innenraum des Pumpengehäuses ist in zwei voneinander getrennte, jeweils ein Paar zusammenwirkender Drehkolben enthaltende, gleiche Förderräume unterteilt, die an der Einlassöffnung und an der Auslassöffnung des Gehäuses miteinander verbunden sind. Die beiden Drehkolben des einen Förderraums sind in ihrer Winkelstellung gegenüber denen des anderen Förderraums versetzt und zwischen den Drehkolben einer Welle sind sich mitdrehende Platten oder Scheiben angeordnet. Rotary lobe pump for inhomogeneous liquids, in particular manure, with a housing having an inlet opening and an outlet opening, in the interior of which four cooperating rotary pistons for an opposite circulation for conveying the liquid from the housing inlet to the housing outlet opening are accommodated on two shafts. The interior of the pump housing is divided into two separate, each containing a pair of cooperating rotary piston, the same delivery chambers, which are connected to each other at the inlet opening and at the outlet opening of the housing. The two rotary pistons of a delivery chamber are offset in their angular position relative to those of the other delivery chamber and between the rotary piston of a shaft are arranged co-rotating plates or discs.

A kind of high-power low pulse lobed rotor pump

本发明涉及大流量及大功率凸轮泵技术领域，尤其是涉及一种大功率低脉动凸轮转子泵。其特点是包括设置在腔体内的两个相同的转子，转子通过键槽周向固定安装在转轴上，转子通过锁紧螺母和锁紧块轴向固定转轴上，腔体侧面对应转子设置有泵盖；所述的转子与腔体之间设置有0～0.2mm的间隙，转轴通过双列圆锥滚子轴承和圆柱滚子轴承固定在齿轮箱体上，两个转轴通过两个同步齿轮的啮合以相同转速转动，两个转子间设置有0.4mm的间隙，齿轮箱体侧面设置齿轮箱盖，转轴与腔体相接处设置机械密封机构，转轴与齿轮箱盖相接处设置橡胶油封。其设备的运行稳定；腔壁型线采用渐变线主要是优化泵体内部的流体的流动，很大程度上减轻流体的脉动现象，降低振动噪声。

A rotary piston pump

The rotary piston pump (20) according to the invention consists of at least two counter-rotating rotary pistons (22) and an oval pump housing (28). Every rotary piston (22) has a rotary piston vane and is provided with at least one contact element (34a). The contact points of the flanks (24) of the at least two rotary pistons (22) in which the at least two rotary pistons (34) form a friction pairing are provided with at least one contact element (34a) each. The interior (32) of the oval pump housing (28) is likewise provided with at least one exchangeable contact element (34b).

Contact element for rotary piston pump

The rotary piston pump (20) according to the invention consists of at least two counter-rotating rotary pistons (22) and an oval pump housing (28). Every rotary piston (22) has a rotary piston vane and is provided with at least one contact element (34a). The contact points of the flanks (24) of the at least two rotary pistons (22) in which the at least two rotary pistons (34) form a friction pairing are provided with at least one contact element (34a) each. The interior (32) of the oval pump housing (28) is likewise provided with at least one exchangeable contact element (34b).

Rotary piston for positive displacement pumps using the Roots principle for incompressible media

Published without abstract.

Pump with two rotary pistons

Sanitary pump

High pressure feed pump for chemical applications - has offset rotors for providing smooth flow without pulsation

The feed pump has two adjacent housing sections (1a,1b) each having an inlet (4a,4b) and outlet (5a,5b) at the intersection zone of two cylinders. Each of these cylinders contains a rotor (6a,7a; 6b,7b) rotated about its central longitudinal axis. The inlet (4b) of the second section (1b) lies directly adjacent the outlet (5a) of the first section (1a), the flow medium being passed between the inlet and outlet openings perpendicular to the axes (8,9) of the rotors. The rotors of each rotor pair are offset from the corresp. rotor of the other pair by 90 deg. ADVANTAGE - Uniform flow.

Rotary piston pump with optimised inlet and outlet

Rotary infusion pumps

An infusion pump (110) includes a housing (112); a rotor (230) inserted into the housing, the rotor including a first ring (38a) of surfaces (236a) that form channels with the housing, and a second ring (38b) of surfaces (236b) that form channels with the housing, the second channel forming surfaces radially offset from the first channel forming surfaces; and a motor (40) operably engaged to rotate the rotor to cause the first and second channel forming surfaces to pump a flow of fluid, the radial offsetting of the second channel forming surfaces from the first channel forming surfaces dampening a pulsatility of the flow of fluid.

Apparatus for sealing off a pump space of a rotary piston pump, and rotary piston pump having same

The invention relates to an apparatus for sealing off, in particular in the region of a shaft feedthrough, a pump space of a rotary piston pump with respect to a fluid-free region of the rotary piston pump, wherein the apparatus has two or more sealing members, which are arrangeable in such a way next to an end side of a rotary piston, arranged on the shaft, in the pump space of the rotary piston pump, that a labyrinth gap extends between the sealing members, said labyrinth gap being configured to extend the seal path in relation to the shaft in the radial direction and in the axial direction. According to the invention, the seal path in the radial direction in relation to the shaft is longer than the seal path in the axial direction in relation to the shaft.

Thick matter or slurry pump

Rotary piston pump and process for operating a rotary piston pump

bomba de pistão rotativo e processo para a operação de uma bomba de pistão rotativo. a presente invenção refere-se a uma bomba de pistão rotativo (20) com, pelo menos, um motor (22), com, pelo menos, dois pistões rotativos (32) que giram um contra o outro. os, pelo menos dois, pistões rotativos (32) estão dispostos em uma carcaça da bomba (26) oval. os pelo menos dois, pistões rotativos (32) estão dispostos em um primeiro eixo de saída de movimento (40) e em um segundo eixo de saída de movimento (41) e são acionados e sincronizados através de, pelo menos, um elemento (44) elástico. Rotary piston pump and process for operating a rotary piston pump. The present invention relates to a rotary piston pump (20) having at least one motor (22) with at least two rotary pistons (32) rotating against each other. at least two rotary pistons (32) are arranged in an oval pump housing (26). the at least two rotary pistons (32) are disposed on a first movement output axis (40) and a second movement output axis (41) and are driven and synchronized through at least one element (44). ) elastic.

rotary piston pump

Metering cap

Rotary piston pump

A rotary piston pump (1) has single- or multiple-lobed delivery pistons (3, 4) which rotate in the pump casing (2) on two piston shafts (6, 7) arranged in parallel. A homokinetic gear system (12), which comprises two meshing gearwheels (13, 14), ensures a matched movement of said two piston shafts (6, 7) and the associated delivery pistons (3, 4). According to the invention, the homokinetic gear system (12) and the delivery chamber (5) are arranged adjacent to each other and without separation in such a way that the gearwheels (13, 14) of the homokinetic gear system (12) serve as auxiliary delivery wheels to the delivery pistons (3, 4). According to a particular further development of the invention, the rotary piston pump (1) has a split-cage drive, for example a split-cage clutch (20). Special lines (45) and ducts (36, 32) are provided, via which a shunted-off part stream is able to remove the lost heat of the split-cage drive. <IMAGE>

Piston with replaceable and/or adjustable surfaces

一种用于泵的活塞，包括毂部，所述毂部限定有相对的外表面和在相对的外表面之间的凹陷侧部。活塞还包括配置为提供可替换的表面的插入物，该插入物连接至相对的外表面中的每一个。一种泵包括具有入口和出口的壳体、和至少两个具有毂部和插入物的活塞。该泵可以是容积式旋转泵，该活塞可以是圆周活塞。

Rotary pump

Drehkolbenpumpe mit einem oder mehreren rotierenden Kolben zur Förderung von im Wesentlichen flüssigen Medien, wobei zumindest bereichsweise am Kolben eine Oberflächenlage als Kolbenspitze aus einem Polymer, insbesondere einem Elastomer, befestigt ist, dadurch gekennzeichnet, dass in der Kolbenspitze (10) mindestens eine Mutter (15) eingeschlossen ist, die jeweils mit einer Befestigungsschraube (14) zusammenwirkt; der Kopf (13) der Befestigungsschraube in einer zur Drehkolbenwelle hin offenen Radialausnehmung (12) des Grundkörpers des Drehkolbens angeordnet ist und mit seinem Gewindeende mit der Mutter (15) im Gewindeeingriff ist und dass sich zwischen der Oberfläche des Grundkörpers des Drehkolbens und der Kolbenspitze (10) eine mit ihrer Dicke den Verschleiß der Kolbenspitze (10) ausgleichenden Unterlegscheibe oder -matte (17) befindet. Rotary pump with one or more rotating pistons for conveying substantially liquid Media, wherein at least partially on the piston a surface layer as a piston tip of a polymer, in particular an elastomer, is fastened, characterized in that in the piston tip (10) at least one nut (15) is included, each with a fastening screw (14) cooperates; the head (13) of the Fixing screw in a radial recess open towards the rotary piston shaft (12) of the main body of the rotary piston is arranged and with its threaded end with the Nut (15) is in threaded engagement and that is between the surface of the Basic body of the Rotary piston and the piston tip (10) a with its thickness the wear of the piston tip (10) balancing washer or mat (17).

Pump for distributing liquid or semiliquid or semi-solid foodstuff product and the machine including the pump

本发明涉及一种用于分配半液体食物制品的泵(1)，所述包括泵(1)进口开口(6)、出口开口(7)、在所述进口开口(6)与所述出口开口(7)之间的分配路径(P)、用于沿着所述分配路径(P)推动所述制品的转子(8)、以及气密腔室(9)，所述气密腔室(9)介于所述进口与出口开口(6、7)之间并且同轴地容纳所述转子(8)；所述分配路径(P)由形成在所述转子(8)的外周边(14)与所述腔室(9)的内周边(13)之间的周期性闭锁的间隙限定，所述转子(8)的外周边(14)装备有三个突出且角度等边的凸角(15)，所述腔室(9)的内周边(13)可弹性变形。

Steam pump with rotating pistons

Electric motor oil pump assembly, steering system and vehicle

Disclosed are an electric motor oil pump assembly (1000), a steering system and a vehicle. The electric motor oil pump assembly (1000) comprises: an electric motor assembly (200); an oil pump assembly (100); an inner soundproof cover (400), the inner soundproof cover (400) being sheathed outside the oil pump assembly (100), and defining, together with the oil pump assembly (100), an inner layer soundproof cavity (401) filled with low pressure oil, the inner layer soundproof cavity (401) being in communication with a low-pressure cavity (101) of the oil pump assembly (100), and the inner soundproof cover (400) being provided with a soundproof cover cavity (402); and a pre-tightening buffer assembly (300), the pre-tightening buffer assembly (300) comprising a piston (310) and an elastic member (320), the piston (310) being in cooperation with the soundproof cover cavity (402) and forming as an integral body with an upper end cover (110) of the oil pump assembly (100), and the elastic member (320) being elastically clamped between a top wall of the soundproof cover cavity (402) and the piston (310). The soundproof cover cavity (402) is in communication with a high pressure cavity (102) of the oil pump assembly (100), so that the piston (310) presses the upper end cover (110) under the action of oil pressure.

GEAR PUMP

The oil pump of electricity, particularly for the electric oil pump of motor vehicle

本发明涉及一种油泵(1)，尤其是用于机动车的电的或电动的辅助泵，该油泵具有壳体(2)以及能围绕轴线()转动地位于该壳体中的泵转子(11)，壳体具有在抽吸侧的入口(15)和在压力侧的出口(16)，泵转子具有至少一个转子部分(11a、11b)，该油泵还具有在泵转子(11)的横截面上延伸的、形式为弹性的压板(20)的柔性的壳体部件，其中，柔性的压板(20)以有利的构造方式保持在两个壳体部分(2a)2b)的边沿区域(20b)内。

Blade gear pumps

提供了一种高速旋转叶片齿轮泵组件，该泵组件将具有刮水片的正排量式叶片齿轮泵与利用叶轮的离心泵组合。该离心泵直接将高压流体流馈送到叶片齿轮泵中，这允许齿轮泵以高速旋转而无空穴现象。泵组件的高速能力允许叶片齿轮泵操作而对于马达轴没有减速齿轮传动。

Low water absorption water pump

本发明属于抽水设备技术领域，具体的说是一种低吸水水泵，包括底座、泵体和电动机；所述泵体固连于底座上表面；所述泵体圆柱体设计；所述泵体内部开设有增压腔与自吸腔；所述泵体远离底座一侧固连有支撑板；所述底座上固连有支撑柱；所述支撑柱与支撑板之间固连；所述电动机通过法兰盘固连于支撑板远离泵体一侧；所述增压腔内转动连接有转动轴；本发明通过设置第一转动轮、第二转动轮和活塞柱，利用第一转动轮和第二转动轮与自吸腔之间的密封效果，将抽水管中的空气持续不断的向上抽取，进而使水流在压力的作用下向上升起，最终通过进水槽进入自吸腔中，同时活塞杆做往复运动对自吸腔中第一转动轮和第二转动轮的抽吸作用起到增强效果。

A kind of nothing is stranded the lobe pump of liquid phenomenon

本发明公开了一种无困液现象的凸轮泵，属于凸轮泵技术领域；本发明中凸轮泵转子的轮廓型线由6段首尾依次光滑连接的齿顶圆弧AB、第一圆弧BC、第一摆线的等距曲线CD、齿根圆弧DE、第二摆线的等距曲线EF、第二圆弧FA组成；本发明中左凸轮泵转子(1)和右凸轮泵转子(2)完全相同，且在排液后形成一个间隙为δ的不封闭工作腔，随着两转子继续作同步异向双回转运动，间隙δ随着工作腔的减小而减小，因此，所提出的凸轮泵在运动过程中不产生困液现象；所提出的凸轮泵还具有转子各曲线之间全部光滑连接的特点，此转子提高了自身的强度和寿命，使其能适用于更高转速的工况，进而提高凸轮泵的运输效率。

A kind of high-power low pulse lobed rotor pump

本发明涉及大流量及大功率凸轮泵技术领域，尤其是涉及一种大功率低脉动凸轮转子泵。其特点是包括设置在腔体内的两个相同的转子，转子通过键槽周向固定安装在转轴上，转子通过锁紧螺母和锁紧块轴向固定转轴上，腔体侧面对应转子设置有泵盖；所述的转子与腔体之间设置有0～0.2mm的间隙，转轴通过双列圆锥滚子轴承和圆柱滚子轴承固定在齿轮箱体上，两个转轴通过两个同步齿轮的啮合以相同转速转动，两个转子间设置有0.4mm的间隙，齿轮箱体侧面设置齿轮箱盖，转轴与腔体相接处设置机械密封机构，转轴与齿轮箱盖相接处设置橡胶油封。其设备的运行稳定；腔壁型线采用渐变线主要是优化泵体内部的流体的流动，很大程度上减轻流体的脉动现象，降低振动噪声。

Vacuum exhaust device coupling structure and vacuum exhaust system

Provided is a coupling structure for vacuum exhaust devices, where each vacuum exhaust device comprises a pump chamber and a casing that demarcates the pump chamber. The coupling structure comprises a first end surface formed on a first side of the casing and a second end surface formed on a second side that is the opposite side to the first side. The casing for the first vacuum exhaust device and the casing for the second vacuum exhaust device are arranged directly overlapping so that a first end surface provided in a first vacuum exhaust device among the plurality of vacuum exhaust devices and a second end surface provided in a second vacuum exhaust device are touching. By fastening the first end surface and the second end surface, the first vacuum exhaust device and the second vacuum exhaust device are connected such that gas can flow between the casing for the first vacuum exhaust device and the casing for the second vacuum exhaust device.

Motor fuel power induction device

Rotary pump with cutting means

A rotary pump of the type having a pair of double-lobed intermeshing rotors rotatably mounted in a housing is provided with a concave recess in the leading edge of each lobe of each rotor which defines a cutting edge with the end surface of each lobe for comminuting solid or stringy material entrained in the liquid being pumped.

Lubrication pump

A lubrication pump for highly viscous fluids including: an elongate housing arranged to be at least partially submerged in the highly viscous fluid; a first rotary pumping device; a second rotary pumping device; and a drive mechanism to drive the first and second rotary pumping devices.

Pump for melted thermoplastic materials

An improvement to surface marking devices for pumping and circulating melted thermoplastic material to various surfaces including roads, parking lots and the like is provided. The pump for melted thermoplastic is comprised of a cold section and a hot section. The hot section is connected to a fluid or electric motor, or alternatively, an internal combustion engine for providing rotation to the pump. The connection to provide rotation to the hot section is through the cold section, which is spaced away from the hot section and connected with shafting to provide rotation to the hot section. A heating jacket is secured to the hot section for transferring heat from an external source to the hot section. The spacing between the hot and cold sections provides the ability to rebuild the hot section of the pump without removal from the cold section and without removal from the vehicle to which it is attached.

Rotary infusion pumps

An infusion pump (110) includes a housing (112); a rotor (230) inserted into the housing, the rotor including a first ring (38a) of surfaces (236a) that form channels with the housing, and a second ring (38b) of surfaces (236b) that form channels with the housing, the second channel forming surfaces radially offset from the first channel forming surfaces; and a motor (40) operably engaged to rotate the rotor to cause the first and second channel forming surfaces to pump a flow of fluid, the radial offsetting of the second channel forming surfaces from the first channel forming surfaces dampening a pulsatility of the flow of fluid.

Plastic dosing pump

Bomba (1) dosificadora de plástico con dos rotores (10) acoplados entre sí través de ruedas (11) dentadas, que pueden accionarse en sentidos opuestos, que están montados en una carcasa (5) de bomba, que está dotada de tubuladuras (6) de aspiración y tubuladuras (7) de salida, presentando cada rotor (10) un árbol (12) de rotor, cuyos extremos (15) de árbol de rotor se alojan en las paredes (8, 4) de la carcasa (5) de bomba, y presentando cada rotor (10) dos paredes (13) de pala de rotor dispuestas diametralmente en el árbol (12) de rotor, en cuyos extremos periféricos está conformada en cada caso una zapata (14) de pala de rotor en parte cilíndrica, apoyándose las zapatas (14) de pala de rotor en las zonas de pared interna cilíndricas de la carcasa (5) de bomba por un lado y en los árboles (13) de pala de rotor del rotor (10) contiguo por otro lado de manera deslizante y produciendo un sellado, caracterizada porque sobre cada árbol (12) de rotor está conformada una rueda (11) dentada formando una sola pieza. Plastic metering pump (1) with two rotors (10) coupled to each other via toothed wheels (11), which can be operated in opposite directions, which are mounted on a pump casing (5), which is equipped with nozzles (6 ) of suction and outlet nozzles (7), each rotor (10) presenting a rotor shaft (12), the ends (15) of the rotor shaft being housed in the walls (8, 4) of the casing (5) pump, and each rotor (10) presenting two rotor blade walls (13) arranged diametrically in the rotor shaft (12), at whose peripheral ends each rotor blade shoe (14) is formed in part cylindrical, with the rotor blade shoes (14) resting on the cylindrical internal wall areas of the pump casing (5) on the one hand and on the rotor blade blades (13) of the adjacent rotor (10) on the other hand slidingly and producing a seal, characterized in that a wheel is formed on each rotor shaft (12) a (11) toothed forming a single piece.

Electronic synchronisation of rotary pistons of a gearless rotary piston pump having straight-toothed rotary pistons

Die Erfindung betrifft eine Wasserkraftanlage, mit einem Drehkolbenmotor (1), umfassend ein Motorengehäuse (2) mit einem Motorraum (4), eine Einlass- und eine Auslassöffnung (6, 8), einen ersten Drehkolben (10), der in dem Motorraum (4) angeordnet ist, und einen zweiten Drehkolben (12), wobei der erste und zweite Drehkolben (10,12) durch eine Fluidströmung von der Einlass- zu der Auslassöffnung (6, 8) in Rotation versetzt werden,einem ersten Generator (19), der mit dem ersten Drehkolben (10) gekoppelt ist, und einem zweiten Generator (21), der mit dem zweiten Drehkolben (12) gekoppelt ist. Gemäß der Erfindung ist eine Steuereinheit (30) zum Synchronisieren der Drehkolben (10,12) vorgesehen, die mit den Generatoren (19, 21) betreibbar verbunden ist, und dazu eingerichtet ist, eine Lastabnahme an den Generatoren (19, 21) zu verringern und/oder die Generatoren (19, 21) zu bestromen, so dass eine Momentenübertragung von einem der Drehkolben (10, 12) auf den anderen der Drehkolben (10, 12) im Wesentlichen vermieden ist.

Piston with replaceable and/or adjustable surfaces

A piston for a pump a hub portion defining opposing outer portions, and inserts configured to provide an adjustable surface coupled to each of the opposing outer portions. The hub portion includes a first hub portion and a second hub portion configured to abut one another. Each of the inserts includes an outer shell and a base portion. The first hub portion includes a plurality of the opposing outer portions, and each of the base portions of the inserts is adjustably coupled to respective opposing outer portions of the first hub portion. A pump includes a housing having an inlet and an outlet, and at least two pistons having a hub portion and inserts. The pump may be a positive-displacement, rotary pump, and the pistons may be circumferential pistons.

Internal combustion engine having at least one crankcase of the dry-sump type

An internal combustion engine having at least one crankcase for defining a guide housing in which at least one crankshaft is guided in rotation about an axis of rotation and lubricated by a lubricating fluid, the at least one crankcase being of the “dry-sump” type. Such an internal combustion engine has at least two pumps forming a pump train of pumps on a common axis, the pump train being fitted in a cylindrical bore of the at least one crankcase.

Gas exhaust pump screw rotor and manufacturing method thereof, and gas exhaust pump including the screw rotor, manufacturing method and assembly method thereof

スクリューロ−ターとステータとの間隙を従来に比べて格段に狭小にしても回転の安全性の確保を十分取ることができ、ポンプの排気性を格段に高めることのできるスクリューローターを提供すること。本発明のスクリューローターは、ポンプに組み入れられた際には、そのスクリュー歯溝部（１０３）の歯の先端面（２０１）がステータ（１０６）の内壁面（２０３）と間隔を置いて配置される。そして、先端面（２０１）上にはＰＦＡ膜が設けてある。このＰＦＡ膜の自由表面とステータ（１０６）の内壁面（２０３）との間隔の幅は、本発明のＰＦＡ膜が所定通り設けられることで、従来に比べ一段と狭小とすることができ、その結果として、ポンプ性能を飛躍的に上げることができる。ＰＦＡの膜は、スクリューローターの少なくとも先端面（２０１）にＰＦＡを塗装後、溶融と再溶融の過程を経て形成されることによって、その自由表面に高い平滑性が付与されている。   To provide a screw rotor capable of sufficiently ensuring the safety of rotation even if the gap between the screw rotor and the stator is made much narrower than before and capable of significantly improving the pumping performance of the pump. . When the screw rotor of the present invention is incorporated in a pump, the tip end surface (201) of the tooth of the screw tooth groove portion (103) is arranged at a distance from the inner wall surface (203) of the stator (106). . A PFA film is provided on the tip surface (201). The width of the space between the free surface of the PFA film and the inner wall surface (203) of the stator (106) can be made narrower than before by providing the PFA film of the present invention as prescribed, and as a result. As a result, the pump performance can be dramatically improved. The PFA film is formed through a process of melting and remelting after coating PFA on at least the tip surface (201) of the screw rotor, so that a high smoothness is imparted to the free surface.