ROTARY PUMP FOR THE PROMOTION OF GUELLE OR SUCH.

The invention concerns a rotary pump for the promotion of property interspersed with foreign bodies such as liquid manure or such, with which in a housing on two to each other parallel waves two, moving in opposite directions rotating turning pistons shifting one on the other are fastened, from one carrier body and, a flexible coat each surrounding its extent exists.

A such pump is descriptive and represented in the DE-PS 20 02 518. In order to be able to promote also liquid manure, which is interspersed such as hay and straw to a large extent with foreign bodies as well as with long-fibrous components and an only with difficulty pumpable consistency has, it is intended that each turning piston has a flexibly flexible outer casing made of rubber.

From the GB-A 781,240 a rotary pump is well-known for the promotion of very hot liquids, with which for perfect sealing also with large thermal expansions in the high temperature range at the housing inside cylindrical bowls are arranged, which are subjected to springy plates.

Article of the GB-A 108,394 is a gear pump for the promotion of lubricating oil o. such at machine tools, whose housing inner walls can be adjusted radially, in order to be able to up-get an arising play, which was caused during a longer actual working time by wear.

Finally from the USA 4,137,024 a rotary compressor comes out, with which the rotor consists of a carrier body and a coat, between which pressure plates subjected by feathers/springs is arranged.

The invention is the basis the task to develop a liquid manure pump further of the initially outlined design in such a way that even after longer actual working time and a wear of the outer casing of the turning pistons a play between pistons and housings, resulted from it, can be replaced balanced and/or the pistons rapidly and simply.

For the solution of the task it is intended according to invention that between the carrying body and the coat of each turning piston adjustment pistons are arranged, which can be subjected by printing media.

Preferably thereby the adjustment pistons are connected by Zuführkanäle with a supply drilling trained into the associated wave.

With this solution by wear or such developed play between pistons and housing inner wall by the fact it is caught up that the piston is radially expand by the printing media, for example fat, oil or air.

In order to prevent that particularly large, solid foreign body in the delivery medium by clamping stop the pump, each turning piston can be turningflexibly on the wave fastened.

So that the turning pistons can be if necessary rapidly removed and replaced, these are divided after a further characteristic of the invention in at least one axial level, whereby the piston parts formed thereby are solvable connected with one another. For the further improvement of the pumping performance and for the decrease of the play between itben and housing inner wall can be intended that the turning piston at the inner wall of the housing exhibits sliding, axially running sealing strips.

After another characteristic of the invention at least a coaxial enular groove is trained into the faces of each turning piston, in which a circular, at the housing fastened sealing projection/lead intervenes labyrinth-like.

This measure contributes to that also with very high pressures no delivery medium can withdraw from the pump.

In addition likewise to the avoidance of leakage losses between the faces of the turning pistons and the opposite inner wall of the housing a wear plate can be fastened. It turned out that the frequently occurring, high pressures in the pump the covers locking the housing to affect so strong that these are deformed or damaged thereby. This disadvantage can be prevented by the wear plate.

Additionally to the described measures the inner wall of the housing can be radially mobile concerning the axle of the associated turning piston. With this measure also a relatively strong wear of the outer casing of the turning piston can be caught up, so that the pumping performance is not impaired.

Thereby it is favourable if the radially mobile inner wall consists of part-cylindrical bowls.

Each of these bowls can be radially adjustable by means of set screws, it is however also possible to cause a radial adjustment by flexible elements or by a printing media.

In order to be able to lead during the radial adjustment movement the bowl at any time in such a way that them walk neither in circumferential direction nor in axial direction, means are intended to their guidance.

In order to cause an increase in pressure with according to invention trained the rotary pump, it is appropriately, axially behind the rotary pump second, according to trained rotary pump too scolded, their intakes to the printing connecting piece of the first rotary pump leads.

The invention is described below in remark examples, which are represented in the design.

Show: Figure 1 a cross section of a rotary pump, which shows two variants for the radial adjustableness of the housing inner wall, figure 2 a partial axial section in the level II - II of the figure 1, figure 3 the cross section of another execution form of the turning piston, figure 4 the cross section of a further Drehkol-65 bens, figure 5 another form of a turning piston in the cross section, figure 6 a turning piston for a pump after the invention in the cross section with adjustment pistons and figure 7 a series connection of the rotary pump in accordance with the invention.

As the figures 1 and 2 show, the rotary pump has a housing 10 oval in the cross section, in which two to each other parallel waves 12 are swivelling stored. On each wave 12 a lemniskatenförmiger turning piston 14 is fastened. The two turning pistons 14 shift themselves according to kind of a root blower one on the other and turn thereby moving in opposite directions.

With the pump of the figures 1 and 2 each turning piston 14 consists surrounding, flexible coat 18, which consists for example of rubber of a firm carrier body 16 and its extent.

The inner wall of the housing 10, at which the turning pistons 14 shift themselves, consists in accordance with figure 1 of two halfcylindrical bowls 20 of a verschleißfesten material. In accordance with the invention each bowl 20 is radially mobile concerning the axle of the associated turning piston 14 (arrow A in figure 1). So that each bowl 20 is led in such a way during its radial shift that it can evade neither in circumferential direction nor in axial direction, intervenes it with a radial, zapfenförmigen beginning 22 in an appropriate radial hole 24, which is trained into the housing 10. So that also with very long turning piston 14 tilting the bowls 20 is avoided, it is appropriate, over the axial length to plan (figure 2) of the bowls 20 several of these guidance beginnings 22.

In order to make the radial adjustment movement possible of the bowls 20, there are several possibilities, by which in figure 1 two are suggested. As the upper half of the figure 1 shows, a tapped hole can be trained into the zapfenförmigen beginning 22, in which a set screw 26 intervenes, whose head pushes at the housing 10 away. Instead of the beginning 22 for the guidance during the radial movement other measures can be planned, for example pins, guidance beginnings at the ends of the bowls 20 o. such.

With in the lower half the figure 1 variant shown is final the radial hole 24 of the housing 10 by a screw 28. Between these and the free end of the beginning 22 a compression spring 30 is assigned, which serves 18 with wear of the Kolbenmantels for the automatic play catching up.

A further, not represented possibility for the wear compensation consists of leading into RA-dialbphrung the 24 a printing media, for example oil.

Figure 1 shows more femer that the radial relocatability of the two bowls 20 is limited after putting a distance s back both in the range of the intake 32 and the printing connecting piece 34 by an attack 36.

Figure 2 shows a front end of the pump, which faces the drive end. Here it is to be recognized that at the housing 10 a cover 38 is flanged on, which takes up the camps 40 for the two waves 12. Between cover 38 and housing 10 a wear plate 42 is clamped, which consists for example of hardened steel. In this way wer-5 high pressures taken up in the pumping area 44 by the wear plate the 42, so that the inner wall of the housing 10 formed by the cover 38 is exonerative and is protected against deformations.

For the sealing of the pumping area 44 outward well-known seals packings 46 are intended. Additionally to it each turning piston 14 is trained opposite face of the frame cover 38, a circular sealing projection/lead 48 coaxial to the wave 12 at, which intervenes in an associated enular groove 50, which is trained into the coat 18 of the turning piston 14. Possible leakage losses are prevented by this labyrinth seal.

If the turning piston 14 - as in the figures 3 to 5 - does not exhibit a flexible coat 18, the enular groove 50 naturally into the carrier body 16 is trained.

After the figure 3 the turning piston 14 in the axial level 52 is divided, so that two piston parts 14 ' and 14 are formed ", which are solvable connected by screw bolt 54 with one another.

Within the range of the parting line of the turning piston carries 14 these two sealing strips 56, which rest against, the halfcylindrical bowl 20 forming the inner wall of the housing 10 sealing.

Furthermore after the figure 3 the turning piston 14 turningflexibly fastened on the wave 12 is. For this the wave 12 is trained in the cross section rectangular and goes through a likewise rectangular mounting hole 58 of the turning piston 14. For the transmission of the torque flexible blocks 60 between the wave 12 serve and the rectangular mounting hole 58 the turning piston the 14, so that this gives way in circumferential direction flexibly, if for example large or hard foreign bodies are promoted by the pumping area 44.

In place of the blocks 60 can be used naturally also different absorption members, for example Federbänder or torsion springs.

The figures 4 and 5 show that also different piston forms can be divided into axial levels and with the associated wave 12 are flexibly connected.

How the play between the turning piston 14 and the inner wall of the housing - here the halfcylindrical bowl 20 - can be compensated after the invention, figure 6. points is here fastened to the inner wall the carrier body 16 surrounding, of flexible coat 18 adjustment pistons 62 for example by curing, which can be subjected with a printing media, for example with oil, air, fat or such the printing media over radial Zuführkanäle 64 to the adjustment pistons 62 is led. The Zuführkanäle 64, in which the adjustment pistons 62 intervene, proceed from a central supply drilling 66, which is trained axially in the turning piston 14 basic wave 12.

For the controlling of the application of pressure a not represented sensor can be intended, which heads for a pump for the printing media, as soon as a pre-determined, permissible play between pistons and housing inner wall is exceeded.

Figure 7 shows an example of use of the invention, with which two rotary pumps l and II are axially connected in series. For the increase of the supply pressure thereby the printing connecting piece 34 of the pump l is connected with the intake 32 of the pump II.