Low leakage seal for low pressure system

A seal configured for use in a chiller refrigeration system is provided including a first flange and a second flange. The first flange and the second flange are coaxially aligned and in direct contact. The second flange includes at least one groove within which a first sealing mechanism and a second sealing mechanism are positioned. The first sealing mechanism and the second sealing mechanism are separated by a distance such that a chamber configured to receive a pressurized gas is formed between the first and second sealing mechanisms.

Shell and tube heat exchanger

A heat exchanger is provided and includes a shell extending between opposing tube sheets to define an interior, nozzles coupled to the shell by which a first fluid is communicated with the interior and a tubular body extending between the opposing tube sheets to transmit a second fluid through the interior whereby heat transfer occurs between the first and second fluids along a heat transfer portion of the tubular body defined from respective planes of opposing faces of the opposing tube sheets, the heat transfer portion having at least first and second topologies at first and second sections thereof, respectively, which are respectively disposed proximate to the respective planes of the opposing faces of the opposing tube sheets.

Chiller Compressor Rolling Bearings with Squeeze Film Dampers

A centrifugal compressor () comprises: a case () having a suction port () and a discharge port (); an impeller () mounted for rotation about an impeller axis () by a plurality of bearings (); and a motor () coupled to the impeller to drive rotation of the impeller about the impeller axis. The bearings each comprise: an inner race (); an outer race (); and rolling elements () between the inner race and outer race. The outer race of each bearing is mounted for radial displacement relative to the case and is surrounded by an associated chamber (); and the chambers are coupled to a port () on the compressor. 1. (canceled)2. The system of wherein:{'b': '166', 'the impeller is coaxial with the motor and mounted to a shaft () of the rotor for said rotation about the impeller axis.'}3. The system of wherein:the centrifugal compressor is an in-line compressor with a first said impeller and a second said impeller; anda first said bearing is between the motor and the first impeller and second impeller.4. The system of wherein: a portion of the case;', 'the outer race; and', {'b': 226', '228, 'a pair of o-rings (, ).'}], 'each of the chambers is bounded by5. The system of further comprising:{'b': '250', 'at least one orifice () between the port and the chambers.'}6. The system of wherein each of the bearings further comprises:{'b': '240', 'an anti-rotation means () coupling the outer race to the case.'}7. The system of further comprising:{'b': '104', 'a drain port () coupled to the chambers.'}8. (canceled)920. A refrigeration system () comprising:{'b': '22', 'claim-text': [{'b': 160', '24', '26, 'a case () having a suction port () and a discharge port ();'}, {'b': 162', '164', '500', '80', '82, 'claim-text': [{'b': '200', 'an inner race ();'}, {'b': '202', 'an outer race (); and'}, {'b': '204', 'rolling elements () between the inner race and outer race; and'}], 'an impeller (, ) mounted for rotation about an impeller axis () by a plurality of bearings (, ), the bearings each ...

Centrifugal compressor inlet guide vane control

A method of positioning an inlet guide vane assembly before start-up of a chiller system including a compressor, a condenser, and a cooler is provided including receiving a first input form sensors located in the cooler and the condenser. A saturation temperature is calculated based on the input from the sensors. A second input indicative of a minimum speed of a motor coupled to the compressor at start-up is received. Using the calculated saturation temperature and the second input, an allowable position of the inlet guide vane assembly is determined. The inlet guide vane assembly is then moved to the determined allowable position.

REFRIGERANT LUBE SYSTEM

In one embodiment, a compressor assembly is provided. The compressor assembly includes a compressor having an inlet, an outlet, and at least one bearing, the compressor configured to compress a first refrigerant. The assembly further includes a lubrication supply conduit fluidly coupled to the compressor and configured to supply a lubricant to the at least one bearing. The lubricant is a second refrigerant. 1. A compressor assembly comprising:a compressor having an inlet, an outlet, and at least one bearing, the compressor configured to compress a first refrigerant; anda lubrication supply conduit fluidly coupled to the compressor and configured to supply a lubricant to the at least one bearing, wherein the lubricant is a second refrigerant.2. The compressor assembly of claim 1 , wherein the first refrigerant is a medium pressure refrigerant and the second refrigerant is a low pressure refrigerant.3. The compressor assembly of claim 1 , wherein the at least one bearing comprises angular contact bearings having lube spacer therebetween claim 1 , wherein the lubrication supply conduit supplies the lubricant to the lube spacer.4. The compressor assembly of claim 1 , wherein the compressor further comprises at least one seal claim 1 , and a bearing cavity housing the at least one bearing claim 1 , wherein the seal is configured to supply compressed first refrigerant from the compressor outlet to the bearing cavity.5. The compressor assembly of claim 1 , wherein the second refrigerant comprises chlorine.6. The compressor assembly of claim 1 , wherein the second refrigerant comprises 1233zd(e).7. The compressor assembly of claim 1 , wherein the second refrigerant comprises at least one of an extreme pressure additive and an anti-wear additive.8. The compressor assembly of claim 7 , wherein the extreme pressure additive comprises at least one of phosphorous and sulfur.9. A refrigeration system comprising:a refrigerant circuit comprising a refrigerant conduit fluidly ...

Hot Gas Bypass for Two-Stage Compressor

A vapor compression system comprising a centrifugal compressor () having: an inlet (); an outlet (); a first impeller stage (); a second impeller stage (); and a motor () coupled to the first impeller stage and second impeller stage. A first heat exchanger () is downstream of the outlet along a refrigerant flowpath. An expansion device () and a second heat exchanger () are upstream of the inlet along the refrigerant flowpath. A bypass flowpath () is positioned to deliver refrigerant from the compressor bypassing the first heat exchanger. A valve () is positioned to control flow through the bypass flowpath, wherein: the bypass flowpath extends from a first location () intermediate the inlet and outlet to a second location () downstream of the first heat exchanger along the refrigerant flowpath. 2. The system of wherein:{'b': 142', '342, 'the second location (; ) is downstream of the expansion device along the refrigerant flowpath.'}3. The system of wherein:{'b': '142', 'the second location () is upstream of the second heat exchanger along the refrigerant flowpath.'}4. The system of wherein:the bypass flowpath is a first bypass flowpath; and{'b': 122', '150', '82, 'a second bypass flowpath () extends from a third location between the first location downstream of the first location to a fourth location (; ) upstream of the expansion device.'}5. The system of wherein:{'b': '150', 'the fourth location () is downstream of the first heat exchanger.'}6. The system of wherein:{'b': '50', 'the fourth location is on an economizer () tank.'}7. The system of further comprising:{'b': 50', '80', '82, 'an economizer () having an economizer line () returning to a fifth () location intermediate the inlet and outlet.'}8. The system of further comprising:{'b': 50', '80', '82, 'an economizer () having an economizer line () returning to an economizer port () intermediate the inlet and outlet.'}9. The system of wherein:{'b': '32', 'the economizer port and the first location are at an ...

Motor rotor and air gap cooling

A motor cooling system for a simply supported compressor includes a rotor shaft 24 having a first end 26 and a second end 28. The rotor shaft 24 includes an axial bore 60 and a plurality of shaft radial holes 64 extending from a first end of the axial bore 60, wherein a cooling medium is supplied to the axial bore 60. The cooling system further includes a rotor 22 coupled to the rotor shaft 24 and having a plurality of rotor axial holes 25 and a plurality of rotor radial holes 27. The plurality of rotor radial holes 27 extends from the plurality of rotor axial holes 25. A refrigerant dam 70 is arranged adjacent a first end of the rotor 22 and includes a plurality of dam axial holes 74 fluidly coupled to an interior cavity 72. The dam axial holes 74 align with the rotor axial holes 25 and the interior cavity 72 aligns with the shaft radial holes 64 to form a flow path between the rotor shaft 24 and the rotor 22.

Centrifugal compressor part load control algorithm for improved performance

A compressor system (5) having a centrifugal compressor (10), controller (16) and an interface (18) is disclosed. The compressor (10) includes adjustable guide vanes (12) and a variable geometry diffuser (14). The controller (16) is in electrical communication with each of the guide vanes (12) and diffuser (14) so as to monitor and adjust positions thereof in accordance with a predetermined control algorithm. The control algorithm is implemented in accordance with a method of controlling the centrifugal compressor (10). The method adjusts the position of the diffuser (14) based on the actual lift, guide vane position and predetermined relationships between diffuser position and reference lift.

Centrifugal Compressor Part Load Control Algorithm for Improved Performance

A compressor system having a centrifugal compressor, controller and an interface is disclosed. The compressor includes adjustable guide vanes and a variable geometry diffuser. The controller is in electrical communication with each of the guide vanes and diffuser so as to monitor and adjust positions thereof in accordance with a predetermined control algorithm. The control algorithm is implemented in accordance with a method of controlling the centrifugal compressor. The method adjusts the position of the diffuser based on the actual lift, guide vane position and predetermined relationships between diffuser position and reference lift.

Compressor Surge Detection

A compressor () has a housing assembly () with a suction port () and a discharge port (). A shaft () is mounted for rotation about an axis () and an impeller () is mounted to the shaft to be driven in at least a first condition so as to draw fluid in through the suction port and discharge the fluid from the discharge port. A magnetic bearing system () supports the shaft. A controller () is coupled to a sensor ( ) and configured to detect at least one of surge and pre-surge rotating stall and, responsive to said detection, take action to prevent or counter surge. 122. A compressor () comprising:{'b': 50', '24', '26, 'a housing assembly () having a suction port () and a discharge port ();'}{'b': 70', '500, 'a shaft () mounted for rotation about an axis ();'}{'b': '44', 'an impeller () mounted to the shaft to be driven in at least a first condition so as to draw fluid in through the suction port and discharge said fluid out from the discharge port;'}{'b': 66', '67', '68, 'a magnetic bearing system (, , ) supporting the shaft;'}{'b': 80', '82, 'a sensor (, ); and'}{'b': '84', 'claim-text': 'the action comprises adjusting the clearance between the impeller and a shroud.', 'a controller () coupled to the sensor and configured to detect at least one of surge and pre-surge rotating stall and, responsive to said detection, take action to prevent or counter surge, wherein2. The compressor of wherein:{'b': '60', 'the housing comprises a motor compartment ();'}{'b': 42', '62', '64, 'an electric motor () has a stator () within the motor compartment and a rotor () within the stator.'}3. The compressor of wherein the magnetic bearing system comprises:{'b': '66', 'a first radial bearing ();'}{'b': '67', 'a second radial bearing (); and'}{'b': '68', 'a thrust bearing ().'}4. The compressor of wherein:the thrust bearing is a thrust/counterthrust bearing.5. The compressor of further comprising:a counterthrust bearing axially spaced apart from the thrust bearing.6. The compressor of ...

Hybrid Compressor System and Methods

An apparatus () has a centrifugal compressor (), a positive displacement compressor (), a first heat exchanger (), and a second heat exchanger (). A plurality of valves () are positioned to provide operation in at least two modes. In a first mode, refrigerant is compressed in the positive displacement compressor and the centrifugal compressor at least partially in parallel. In a second mode, refrigerant is compressed in the positive displacement compressor and the centrifugal compressor is offline. In a third mode, refrigerant is compressed in the positive displacement compressor and the centrifugal compressor at least partially in series. 120. An apparatus () comprising:{'b': '24', 'a centrifugal compressor ();'}{'b': '26', 'a positive displacement compressor ();'}{'b': '32', 'a first heat exchanger ();'}{'b': '36', 'a second heat exchanger (); and'}{'b': 70', '72', '74, 'claim-text': [ 'refrigerant is compressed in the positive displacement compressor and the centrifugal compressor at least partially in parallel;', 'operation in a first mode wherein, refrigerant is compressed in the positive displacement compressor; and', 'the centrifugal compressor is offline; and, 'operation in a second mode wherein, 'refrigerant is compressed in the positive displacement compressor and the centrifugal compressor at least partially in series.', 'operation in a third mode wherein], 'a plurality of valves (, , ) positioned to provide at least two of2. The apparatus of wherein:the positive displacement compressor is a screw compressor.3. The apparatus of wherein:the centrifugal compressor has a rated maximum capacity; andthe positive displacement compressor has a rated maximum capacity of 100-150% of the rated maximum capacity of the centrifugal compressor.4. The apparatus of wherein:the plurality of valves are positioned to provide all three of said modes.5. The apparatus of wherein:the plurality of valves are positioned to provide at least the first mode and second mode.6. The ...

Compressor Windage Mitigation

A compressor () has a housing assembly () with a suction port (), a discharge port (), and a motor compartment (). An electric motor () has a stator () within the motor compartment and a rotor () within the stator. The rotor is mounted for rotation about a rotor axis (). One or more working elements () are coupled to the rotor to be driven by the rotor in at least a first condition so as to draw fluid in through the suction port and discharge the fluid from the discharge port. A gap () is between the rotor and stator. The gap is isolated () from an outer portion () of the motor compartment. The outer portion is exposed to the stator. One or more passages () are positioned to draw fluid from the gap in the first condition. 122. A compressor () comprising:{'b': 40', '24', '26', '60, 'a housing assembly () having a suction port () and a discharge port () and a motor compartment ();'}{'b': 42', '62', '64', '500, 'an electric motor () having a stator () within the motor compartment and a rotor () within the stator, the rotor being mounted for rotation about a rotor axis ();'}{'b': '44', 'one or more working elements () coupled to the rotor to be driven by the rotor in at least a first condition so as to draw fluid in through the suction port and discharge said fluid out from the discharge port;'}{'b': '80', 'a gap () between the rotor and stator;'}{'b': 140', '142', '144, 'means for (, ) isolating said gap from an outer portion () of the motor compartment, said outer portion exposed to the stator; and'}{'b': '150', 'one or more passages () positioned to draw fluid from the gap in the first condition.'}2. The compressor of wherein:the one or more passages are further positioned to pass said fluid from the gap to a suction housing plenum.3. The compressor of wherein:one or more additional passages are positioned to pass said fluid from the outer portion of the motor compartment to the gap.4. The compressor of wherein:the one or more additional passages comprise a leakage ...

Shell and tube heat exchanger

A heat exchanger is provided and includes a shell extending between opposing tube sheets to define an interior, nozzles coupled to the shell by which a first fluid is communicated with the interior and a tubular body extending between the opposing tube sheets to transmit a second fluid through the interior whereby heat transfer occurs between the first and second fluids along a heat transfer portion of the tubular body defined from respective planes of opposing faces of the opposing tube sheets, the heat transfer portion having at least first and second topologies at first and second sections thereof, respectively, which are respectively disposed proximate to the respective planes of the opposing faces of the opposing tube sheets.

MAGNETIC BEARING COMPRESSOR PROTECTION

A vapor compression system and method for operating the vapor compression system are provided. The vapor compression system includes a first compressor, a second compressor, a condenser, and at least one check valve disposed between the first compressor and the condenser. The method provides for the transmitting of a shutdown command to at least one of the first compressor and the second compressor, at least one of the first compressor and the second compressor including a rotating shaft and a magnetic bearing, the magnetic bearing having an active mode and an inactive mode, the magnetic bearing levitating the rotating shaft in the active mode. The method further provides for the monitoring of at least one of a rotational speed of the rotating shaft and a differential pressure over the check valve for a preset time, wherein the magnetic bearing remains in the active mode at least during the preset time. 1. A method of operating a vapor compression system comprising a first compressor , a second compressor , a condenser , and at least one check valve disposed between the first compressor and the condenser , the method comprising:transmitting a shutdown command to at least one of the first compressor and the second compressor, at least one of the first compressor and second compressor comprising a rotating shaft and a magnetic bearing, the magnetic bearing comprising an active mode and an inactive mode, the magnetic bearing levitating the rotating shaft in the active mode; andmonitoring at least one of a rotational speed of the rotating shaft and a differential pressure over the check valve for a preset time, wherein the magnetic bearing remains in the active mode at least during the preset time.2. The method of claim 1 , wherein the preset time is less than ten minutes after the shutdown command is transmitted.3. The method of claim 1 , further comprising switching the magnetic bearing from the active mode to the inactive mode when the rotational speed reaches an ...

IMPELLER INTEGRATED MOTOR FOR CENTRIFUGAL COMPRESSOR

An impeller of a centrifugal compressor comprising an impeller body () rotatable about an impeller axis Wand a motor operable to drive said impeller about said impeller axis. The motor includes a stator assembly () and a rotor assembly (). The rotor assembly is associated with said impeller body. 1. An impeller of a centrifugal compressor comprising:an impeller body rotatable about an impeller axis; anda motor operable to drive said impeller about said impeller axis, said motor including a stator assembly and a rotor assembly, said rotor assembly being associated with said impeller body.2. The compressor of claim 1 , wherein said rotor assembly further comprises at least one interactive component configured to interact with a magnetic field generated by said stator assembly to drive said impeller about said impeller axis.3. The compressor of claim 2 , wherein said at least one interactive component is not coupled to an electrical source separate from said stator assembly.4. The compressor of claim 2 , wherein said at least one interactive component is integrally formed with said impeller body.5. The compressor of claim 2 , wherein said at least one interactive component is removably coupled to said impeller body.6. The compressor of claim 2 , wherein said at least one interactive component is coupled to an exterior surface of said impeller body.7. The compressor of claim 2 , wherein said at least one interactive component is at least partially embedded within said impeller body.8. The compressor of wherein said at least one interactive component comprises a plurality of interactive components positioned about a periphery of said impeller body.9. The compressor of claim 2 , wherein said stator assembly includes at least one electrical component operable to generate a magnetic field when power is applied thereto.10. The compressor of claim 9 , further comprising a shroud arranged adjacent said impeller body claim 9 , said stator assembly being associated with said ...

VANELESS SUPERSONIC DIFFUSER FOR COMPRESSOR

A mixed-flow compressor includes an impeller attached to a shaft and rotatable about a shaft axis. A vaneless diffuser is located axially downstream of the impeller and has a converging portion and a diverging portion. A vaned diffuser is located axially downstream of the vaneless diffuser. 1. A mixed-flow compressor comprising:an impeller attached to a shaft and rotatable about a shaft axis;a vaneless diffuser located axially downstream of the impeller having a converging portion and a diverging portion; anda vaned diffuser located axially downstream of the vaneless diffuser.2. The mixed-flow compressor of claim 1 , wherein the converging portion is located axially upstream of the diverging portion.3. The mixed-flow compressor of claim 2 , wherein the converging portion is connected to the diverging portion with an axially extending mid-portion having a constant cross-sectional area.4. The mixed-flow compressor of claim 1 , wherein the vaneless diffuser includes an inner wall and an outer wall defining a fluid flow path there between.5. The mixed-flow compressor of claim 4 , wherein at least one of the inner wall and the outer wall are rotatable relative to the shaft axis.6. The mixed-flow compressor of claim 4 , wherein both the inner wall and the outer wall are rotatable about the shaft axis.7. The mixed-flow compressor of claim 6 , wherein the inner wall is supported on at least one inner wall bearings and the outer wall is supported on at least one outer wall bearings.8. The mixed-flow compressor of claim 1 , wherein the vaned diffuser includes a plurality of vanes circumferentially spaced from each other around the shaft axis.9. The mixed-flow compressor of claim 1 , wherein the converging portion extends up to 75% of an axial length of the vaneless diffuser.10. The mixed-flow compressor of claim 9 , wherein the converging portion includes up to a 50% reduction in cross-sectional area between an inlet to the converging portion and an outlet of the converging ...

MIXED-FLOW COMPRESSOR WITH COUNTER-ROTATING DIFFUSER

A compressor includes a housing. An impeller is located within the housing and rotatable about an impeller axis in a first rotational direction. A rotor section is rotatable about the impeller axis in a second rotational direction opposite the first rotational direction. 1. A compressor comprising:a housing;an impeller located within the housing and rotatable about an impeller axis in a first rotational direction; anda rotor section rotatable about the impeller axis in a second rotational direction opposite the first rotational direction.2. The compressor of claim 1 , wherein the rotor section includes a rotor having at least one row of rotor blades.3. The compressor of claim 1 , wherein the impeller includes a hub and a plurality of impeller blades extending outward from the hub toward a portion of the housing.4. The compressor of claim 3 , wherein the rotor section includes a cylindrical rotor with a plurality of rotor blades extending from a surface of the cylindrical rotor.5. The compressor of claim 4 , wherein the plurality of impeller blades each include an upstream end and downstream end with the upstream end being circumferentially spaced in the first rotational direction from the downstream end and the plurality of rotor blades each include an upstream end and a downstream end with the upstream end being circumferentially spaced in the second rotational direction from the downstream end.6. The compressor of claim 5 , wherein each of the plurality of rotor blades and each of the plurality of impeller blades include a curvature in the first circumferential direction.7. The compressor of claim 1 , wherein the impeller is driven by an impeller motor and the rotor is driven by a separate rotor motor.8. The compressor of claim 1 , wherein the impeller is driven by an impeller motor and the rotor section is driven by the impeller motor through a transmission to reverse a rotational output of the impeller motor.9. The compressor of claim 8 , wherein the ...

Compressor Bearing Cooling

A compressor () has a housing assembly () with a suction port (), a discharge port (), and a motor compartment (). An electric motor () has a stator () within the motor compartment and a rotor () within the stator. The rotor is mounted for rotation about a rotor axis (). One or more working impellers () are coupled to the rotor to be driven by the rotor in at least a first condition so as to draw fluid in through the suction port and discharge the fluid from the discharge port. An inlet guide vane (IGV) array () is between the suction port () and the one or more impellers (). One or more bearing systems () support the rotor () and/or the one or more impellers (). One or more main drain passages () are coupled to the bearings to pass fluid along a drain flowpath from the bearings to a location () upstream of the impeller and downstream of the IGV array. 2. The compressor of wherein:the one or more drain passages are positioned to pass said fluid to a suction housing plenum.3. The compressor of further comprising:{'b': '150', 'claim-text': [{'b': '152', 'a motive flow inlet ();'}, {'b': '154', 'a suction flow inlet (); and'}, {'b': '156', 'an outlet (), the drain flowpath passing through the ejector from the suction flow inlet to the outlet.'}], 'an ejector () having4. The compressor of wherein:{'b': '240', 'a motive flow flowpath to the motive flow inlet extends from downstream () of the one or more impellers.'}5. The compressor of wherein:{'b': '184', 'a motive flow flowpath to the motive flow inlet extends from downstream of the one or more impellers but upstream of a discharge plenum ().'}6. The compressor of further comprising:{'b': '94', 'one or more bearing feed passages () coupled to the bearings to pass fluid along a supply flowpath to the bearings; and'}{'b': '160', 'claim-text': [{'b': '162', 'a motive flow inlet ();'}, {'b': '164', 'a suction flow inlet (); and'}, {'b': '166', 'an outlet (), the supply flowpath passing through the another ejector from the ...

Screw compressor with magnetic gear

A screw compressor (12) includes a casing (20) having a suction port and a discharge port, a male rotor (28) rotatable relative to said casing about a first axis (A), a female rotor (30) rotatable relative to said casing about a second axis (B), and a magnetic gear system including a first magnetic gear (60) associated with said male rotor and a second magnetic gear (62) associated with said female rotor. The first magnetic gear and the second magnetic gear are positioned such that a magnetic field of said first magnetic gear interacts with said second magnetic gear to drive rotation of said female rotor about said second axis.

Hybrid Bearings

A bearing () comprises: an inner race (); an outer race (); and a plurality of rolling elements (). The inner race comprises a nitrogen-alloyed steel (). The outer race comprises a steel () with lower nitrogen content than said nitrogen-alloyed steel. 2. The bearing of wherein:{'b': '44', 'the outer race has a coating () on the steel.'}4. The bearing of wherein:the outer race coating comprises DLC.5. The bearing of wherein:the DLC coating is a tungsten carbide/carbon (WC/C) coating.6. The bearing of wherein:the rolling elements are ceramic.7. The bearing of wherein:{'sub': 3', '4, 'the rolling elements are at least 50.0 weight percent SiN.'}8. The bearing of wherein:the rolling elements are balls.9. The bearing of wherein:the inner race is uncoated.10. The bearing of further comprising:{'b': '32', 'a cage () retaining the rolling elements.'}11. The bearing of being a radial/thrust bearing.12. The bearing of wherein:the outer race steel has at least 0.10 wt % lower nitrogen content than the inner race steel.13. The bearing of wherein:the outer race steel has at least 5.0 wt % lower chromium content than the inner race steel.14. The bearing of wherein:the outer race steel has at least 0.2 wt % higher carbon content than the inner race steel.15120. A compressor () comprising the bearing of .16. The compressor of being a centrifugal compressor having:{'b': '132', 'a housing (); and'}{'b': '128', 'an impeller () within the housing.'}17. The compressor of further comprising:{'b': 130', '144, 'a motor () within the housing, the bearing supporting a rotor () of the motor.'}18100. A vapor compression system () comprising the compressor of .19. A method for manufacturing the bearing of claim 3 , the method comprising:applying the coating by CVD or PVD.20. The bearing of wherein:the rolling elements are ceramic;the outer race steel has at least 0.10 wt % lower nitrogen content than the nitrogen-alloyed steel;the outer race steel has at least 5.0 wt % lower chromium content ...

Compressor Bearing Cooling

A vapor compression system () comprises a compressor () having one or more bearing systems () supporting a rotor and/or one or more working elements (). One or more bearing feed passages () are coupled to the bearings to pass fluid along a supply flowpath to the bearings. A mechanical pump () is positioned to drive fluid along the supply flowpath. An ejector () has a motive flow inlet () coupled to the mechanical pump to receive refrigerant from the mechanical pump. 120220320. A vapor compression system (; ; ) comprising:{'b': '22', 'claim-text': [{'b': 40', '24', '26', '60, 'a housing assembly () having a suction port () and a discharge port () and a motor compartment ();'}, {'b': 42', '62', '64', '500, 'an electric motor () having a stator () within the motor compartment and a rotor () within the stator, the rotor being mounted for rotation about a rotor axis ();'}, {'b': '44', 'one or more working elements () coupled to the rotor to be driven by the rotor in at least a first condition so as to draw fluid in through the suction port and discharge said fluid out from the discharge port;'}, {'b': 66', '68, 'one or more bearing systems (, ) supporting the rotor and/or the one or more working elements, and'}, {'b': 114', '100, 'one or more bearing feed passages () coupled to the bearings to pass fluid along a supply flowpath () to the bearings;'}], 'a compressor () comprising{'b': 130', '330, 'a mechanical pump (; ) positioned to drive fluid along the supply flowpath to the one or more bearings;'}{'b': '28', 'a first heat exchanger () downstream of the discharge port along a refrigerant primary flowpath in a first operational mode;'}{'b': '32', 'an expansion device () downstream of the first heat exchanger along the primary flowpath in the first operational mode; and'}{'b': '30', 'a second heat exchanger () downstream of the expansion device and coupled to the suction port to return refrigerant in the first operational mode, the system further comprising{'b': 140', ' ...

Compressor Bearing Cooling Via Purge Unit

A compressor () has a housing assembly () with a suction port (), a discharge port (), and a motor compartment (). An electric motor () has a stator () within the motor compartment and a rotor () within the stator. The rotor is mounted for rotation about a rotor axis (). One or more working impellers () are coupled to the rotor to be driven by the rotor in at least a first condition so as to draw fluid in through the suction port and discharge the fluid from the discharge port. An inlet guide vane (IGV) array () is between the suction port () and the one or more impellers (). One or more bearings () support the rotor () and/or the one or more impellers (). A purge unit () has a vapor inlet line () for receiving a refrigerant flow and a return line (A, B) for returning a contaminant-depleted refrigerant flow. A supply flowpath (A, B) for supplying refrigerant to the bearings extends from the purge unit. 2. The vapor compression system of wherein:{'b': 407', '66', '407', '68, 'the supply flowpath comprises a first branch (A) extending to a first () of the bearings and a second branch (B) extending to a second () of the bearings.'}3. The vapor compression system of wherein:{'b': '496', 'a weir () in the purge unit divides flow between the supply flowpath branches.'}4. The vapor compression system of wherein:{'b': 414', '417', '417, 'the supply flowpath is formed by or branches from the return line (, A, B).'}5. The vapor compression system of wherein:{'b': 407', '407', '100, 'the supply flowpath (A, B) is a second supply flowpath and a first supply flowpath () does not branch from the return line.'}6. The vapor compression system of wherein:the first supply flowpath and the second supply flowpath are non-overlapping.7. The vapor compression system of wherein:there is no pump along the first supply flowpath.8. The vapor compression system of further comprising:{'b': '130', 'a pump () along the first supply flowpath.'}9. The vapor compression system of wherein the purge ...

SEALING ASSEMBLY FOR CENTRIFUGAL COMPRESSOR AND CENTRIFUGAL COMPRESSOR HAVING THE SAME

The present invention provides a seal assembly for use in a centrifugal compressor and a centrifugal compressor having same. The centrifugal compressor comprises an impeller and a housing, wherein the impeller comprises a gimbal, provided on the back of the impeller, having an inner diameter and an outer diameter; and the seal assembly for use in a centrifugal compressor comprises a sealing section, the sealing section comprising a sealing tooth formed on the impeller and a sealing ring provided on the housing, wherein an elastic part is provided on a contact surface of the sealing ring with the sealing tooth. According to the seal assembly of the present invention, the sealing clearance between the sealing ring and the sealing tooth is effectively reduced by way of multiple sets of sealing sections and the elastic parts provided therebetween. 1. A seal assembly for use in a centrifugal compressor , the centrifugal compressor comprising an impeller and a housing , wherein the impeller comprises a gimbal , provided on the back of the impeller , having an inner diameter and an outer diameter , characterized in that the seal assembly comprises:a sealing section, the sealing section comprising a sealing tooth formed on the impeller and a sealing ring provided on the housing, wherein an elastic part is provided on a contact surface of the sealing ring with the sealing tooth.2. The seal assembly according to claim 1 , characterized in that the sealing section provides an axial seal and/or a radial seal between the impeller and the housing.3. The seal assembly according to claim 2 , characterized in that the axial seal between the impeller and the housing comprises:a seal between a sealing tooth on an outer diameter end face of the gimbal and the sealing ring; and/ora seal between a sealing tooth on an inner diameter end face of the gimbal and the sealing ring.4. The seal assembly according to claim 2 , characterized in that the radial seal between the impeller and the ...

LOW LEAKAGE SEAL FOR LOW PRESSURE SYSTEM

A seal configured for use in a chiller refrigeration system is provided including a first flange and a second flange. The first flange and the second flange are coaxially aligned and in direct contact. The second flange includes at least one groove within which a first sealing mechanism and a second sealing mechanism are positioned. The first sealing mechanism and the second sealing mechanism are separated by a distance such that a chamber configured to receive a pressurized gas is formed between the first and second sealing mechanisms. 1. A seal configured for use in a chiller refrigeration system , comprising:a first flange; anda second flange being coaxially aligned and directly in contact with the first flange, the second flange includes at least one groove within which a first sealing mechanism and a second sealing mechanism are positioned, the first sealing mechanism and the second sealing mechanism being separated by a distance such that a chamber configured to receive a pressurized gas is formed between the first sealing mechanism and the second sealing mechanism.2. The seal according to claim 1 , wherein a pressure of the pressurized gas is greater than a pressure of ambient air adjacent the first flange and the second flange.3. The seal according to claim 1 , wherein the first flange and the second flange are connected to one another with at least one fastener.4. The seal according to claim 1 , further comprising a pipe extending through the second flange into the chamber claim 1 , the pipe being configured to fluidly couple the chamber to a supply of pressurized gas.5. The seal according to claim 4 , wherein the supply of pressurized gas is a discharge of a condenser of the chiller refrigeration system.6. The seal according to claim 1 , wherein the first sealing mechanism is arranged near an inner diameter of the second flange and the second sealing mechanism is arranged near an outer diameter of the second flange.7. The seal according to claim 1 , ...

Low-Oil Refrigerants and Vapor Compression Systems

A vapor compression system () has: a centrifugal compressor () having an inlet () and an outlet (); and an electric motor () having a stator () and a rotor (). A plurality of bearings () support the rotor. A refrigerant charge comprises a base refrigerant and one or more oils. The one or more oils are present at a total concentration of - parts per million (ppm) by weight. 120. A vapor compression system () comprising:{'b': '22', 'claim-text': [{'b': 40', '42, 'an inlet () and an outlet (); and'}, {'b': '28', 'claim-text': [{'b': '30', 'a stator (); and'}, {'b': '32', 'a rotor ();'}], 'an electric motor () having, {'b': '36', 'a plurality of bearings () supporting the rotor;'}], 'a centrifugal compressor () havinga refrigerant charge comprising a base refrigerant and one or more oils, wherein:the plurality of bearings are rolling element bearings;wherein the system lacks an oil separator and oil reservoir; andthe one or more oils are present at a total concentration of 80-5000 parts per million (ppm) by weight.2. The system of further comprising:a protective coating on the bearings, the coating comprising a metal-halide based under layer and a carbonaceous polymer upper layer.3. The system of further comprising:{'b': '58', 'a condenser ();'}{'b': '88', 'an evaporator ();'}{'b': 94', '24, 'a suction line () along a flowpath between the evaporator and an inlet of a first stage () of the compressor;'}{'b': 48', '26', '50, 'a flowpath leg from a discharge () of the first stage to a second stage () inlet (); and'}{'b': 56', '42', '60, 'a discharge line () along a flowpath between a discharge () of the second stage and an inlet () of the condenser.'}4. The system of lacking an oil separator and an oil reservoir.5. The system of wherein:the charge is at least 95% by weight said base refrigerant.6. (canceled)7. The system of wherein:the base refrigerant is one or more hydrofluoroolefins, hydrochloroolefins, and/or hydrochlorofluoroolefins.8. The system of wherein:the base ...

Economized Centrifugal Compressor

A compressor () has a housing assembly () with a suction port (), a discharge port (), and an economizer port (). An impeller () is mounted to be driven in at least a first condition so as to draw a main flow of fluid through the suction port and discharge the fluid from the discharge port. A diffuser () has a plurality of diffuser passages (). Each diffuser passage has an inlet () positioned to receive fluid from the impeller and an outlet () downstream of the inlet in the first condition. One or more passages () are positioned to draw an economizer flow of fluid from the economizer port and deliver the economizer flow downstream of the impeller inlet () but upstream of the diffuser passage outlets (). 1. A centrifugal compressor comprising:a housing assembly having a suction port, a discharge port, and an economizer port;an impeller mounted to be driven in at least a first condition so as to draw a main flow of fluid in through the suction port and discharge said fluid out from the discharge port;a diffuser having one or more diffuser passages each having an inlet positioned to receive fluid from the impeller and an outlet downstream of the inlet in the first condition; andone or more passages positioned to draw an economizer flow of fluid from the economizer port and deliver the economizer flow between the impeller and the diffuser passage inlets.2. The compressor of further comprising: a stator within a motor compartment of the case; and', 'a rotor within the stator, the rotor being mounted for rotation about a rotor axis., 'an electric motor having3. The compressor of wherein:the one or more passages are positioned to deliver said economizer flow of fluid through a gap between an impeller shroud and the diffuser.4. The compressor of wherein:the impeller shroud is a portion of the housing assembly between the impeller and the diffuser passage inlets.5. The compressor of wherein:the compressor is a single-stage compressor.6. The compressor of wherein:the one or ...

Mixed-flow compressor configuration for a refrigeration system

A centrifugal compressor includes a casing. An impeller is arranged within the casing. The impeller is rotatable about an axis. A diffuser section is arranged within the casing. The diffuser section is positioned axially downstream from an outlet of the impeller and includes a forward portion fixed relative to the impeller and an aft portion distinct from the forward portion.

Compressor Clearance Control

A compressor () has a housing assembly () with a suction port () and a discharge port (). An impeller () is supported by a shaft () which is mounted for rotation to be driven in at least a first condition so as to draw fluid in through the suction port () and discharge the fluid from the discharge port (). A magnetic bearing system () supports the shaft (). A controller () is coupled to an axial position sensor () and is configured to control impeller position. 122. A compressor () comprising:{'b': 50', '24', '26, 'a housing assembly () having a suction port () and a discharge port ();'}{'b': '54', 'an impeller ();'}{'b': '70', 'a shaft () supporting the impeller to be driven in at least a first condition so as to draw fluid in through the suction port and discharge said fluid out from the discharge port;'}{'b': 66', '67', '68, 'a magnetic bearing system (, , ) supporting the shaft;'}{'b': '80', 'an axial position sensor (); and'}{'b': '84', 'a controller () coupled to the axial position sensor and configured to control impeller position to vary with at least one of system capacity and lift.'}2. The compressor of wherein:the variance with at least one of system capacity and lift results from use of a look-up table of a target position or a minimum cold clearance position associated with said at least one of capacity and lift.3. The compressor of wherein:{'b': '60', 'the housing assembly further comprises a motor compartment ();'}{'b': 52', '62', '64', '500, 'an electric motor () has a stator () within the motor compartment and a rotor () within the stator, the rotor being mounted for rotation about a rotor axis (); and'}{'b': '54', 'the shaft couples the impeller () to the rotor.'}4. The compressor of wherein the magnetic bearing system comprises:{'b': '66', 'a first radial bearing ();'}{'b': '67', 'a second radial bearing (); and'}{'b': '68', 'a thrust bearing ().'}5. The compressor of wherein:the thrust bearing is a thrust/counterthrust bearing.6. The compressor ...

COMPRESSOR HAVING EXTENDED RANGE AND STABILITY

A ported shroud () for use in a compressor includes a body having a first end () and a second opposite end (). The body is disposed concentrically about an axial passageway () and includes an inlet () for receiving a fluid flow formed adjacent the first end () and an outlet port () for discharging the fluid flow formed adjacent the second end (). A toroidal volute () is disposed within the interior of the body and fluidly couples the inlet and the outlet. 1. A ported shroud for use in a compressor , comprising:a body having a first end and a second opposite end, the body being disposed concentrically about an axial passageway;an inlet for receiving a fluid flow formed adjacent the first end;an outlet port for discharging the fluid flow formed adjacent the second end; anda toroidal volute disposed within the interior of the body and fluidly coupling the inlet and the outlet.2. The ported shroud of claim 1 , wherein at least one of a size and contour of the inlet is selected based on a pressure distribution within the compressor.3. The ported shroud of claim 1 , wherein the inlet includes a slot.4. The ported shroud of claim 3 , wherein the slot extends circumferentially about the axial passageway.5. The ported shroud of claim 3 , wherein the slot includes a ramped surface extending from the first end toward the second end.6. The ported shroud of claim 5 , wherein the ramped surface gradually increases in distance from the first end about a circumferential of the axial passageway claim 5 , the distance being measured parallel to an axis of the axial passageway.7. A compressor comprising:a housing including an inlet opening formed at a first end of the housing and an internal wall extending from the inlet opening to define a passageway;an impeller including at least one impeller blade, the impeller being rotatable about an axis and positioned adjacent an end of the passageway for receiving a fluid flow there through; anda ported shroud positioned adjacent at least a ...

CENTRIFUGAL COMPRESSOR AND METHOD OF OPERATING THE SAME

A centrifugal compressor and a method of operating a centrifugal compressor. The centrifugal compressor includes: an impeller configured to suction a gas to be compressed; a diffuser disposed downstream of the impeller to pressurize the gas, the diffuser comprising a movable ring, a main passage in which the gas flows past the ring, and an openable branch passage; and a circulation loop comprising an inlet and an outlet, the outlet being in communication with an inlet of the impeller; the branch passage is disposed to be in communication with the main passage and the circulation loop when the ring moves into the main passage so that a portion of the gas in the main passage passes through the circulation loop and returns to the impeller so as to be suctioned, and to be closed when the ring is withdrawn from the main passage. 1. A centrifugal compressor , comprising:{'b': '12', 'an impeller () configured to suction a gas to be compressed;'}{'b': 13', '12', '13', '22', '24', '22', '26, 'a diffuser () disposed downstream of the impeller () to pressurize the gas, the diffuser () comprising a movable ring (), a main passage () in which the gas flows past the ring (), and an openable branch passage (); and'}{'b': 42', '43', '44', '44', '12, 'a circulation loop () comprising an inlet () and an outlet (), the outlet () being in communication with an inlet of the impeller ();'}{'b': 26', '24', '42', '22', '24', '24', '42', '12', '22', '24, 'wherein the branch passage () is disposed to be in communication with the main passage () and the circulation loop () when the ring () moves into the main passage () so that a portion of the gas in the main passage () passes through the circulation loop () and returns to the impeller () so as to be suctioned, and to be closed when the ring () is withdrawn from the main passage ().'}2241618165222522622525222. The centrifugal compressor according to claim 1 , wherein the main passage () is defined by partitions ( claim 1 , ) that are ...

LUBRICATION SUPPLY SYSTEM

A lubrication additive recovery system is provided for use with a vapor compression system. The vapor compression system includes a compressor having a bearing, a condenser and an evaporator. The lubrication additive recovery system includes a lubrication ring formed to define first and second through-holes, a first system by which a portion of a required supply of lubrication is drawn from the condenser and provided to the bearing through the first through-holes and a second system by which a remainder of the required supply of lubrication is recovered from the evaporator and provided along with compressor discharge gas to the bearing through the second through-holes. 2. The lubrication additive recovery system according to claim 1 , wherein:the lubrication ring comprises an annular body, andthe first and second through-holes are respectively arranged in first and second separate arc-segments of the annular body.3. The lubrication additive recovery system according to claim 1 , wherein:the first system comprises a first fluid movement element configured to pump the portion of the required supply of lubrication from the condenser to the bearing, andthe second system comprises a second fluid movement element configured to draw the compressor discharge gas from piping fluidly connecting the compressor and the condenser for provision thereof to the bearing and recover the remainder of the required supply of lubrication from the evaporator for provision thereof to the bearing.4. The lubrication additive recovery system according to claim 3 , wherein the first fluid movement element comprises a pump and the second fluid movement element comprises an eductor.5. The lubrication additive recovery system according to claim 3 , further comprising filters fluidly interposed between the first fluid movement element and the first through-holes and between the second fluid movement element and the second through-holes.6. The lubrication additive recovery system according to claim ...

ACTIVE FILTER FOR OIL-FREE REFRIGERANT COMPRESSOR

A compressor system includes a compressor including a compressor inlet, a compressor outlet, and a bearing assembly, the compressor configured to compress a heat transfer fluid. An additive dispenser is fluidly coupled to the compressor upstream of the bearing assembly. The additive dispenser is configured to controllably release a volume of an additive material into the heat transfer fluid, the additive material configured to lubricate the bearing assembly. A method of lubricating a bearing assembly of compressor includes locating a volume of additive material at an additive dispenser fluidly coupled to a compressor, dispensing a portion of the additive material into the flow of heat transfer fluid at a selected time, flowing the heat transfer fluid containing the additive material to a bearing assembly of the compressor, and lubricating the bearing assembly of the compressor with the additive material. 1. A compressor system , comprising:a compressor including a compressor inlet, a compressor outlet, and a bearing assembly, the compressor configured to compress a heat transfer fluid; andan additive dispenser fluidly coupled to the compressor upstream of the bearing assembly, the additive dispenser configured to controllably release a volume of an additive material into the heat transfer fluid, the additive material configured to lubricate the bearing assembly.2. The compressor system of claim 1 , wherein the additive material is in the form of one of a liquid claim 1 , a solid claim 1 , a gel or a powder.3. The compressor system of claim 2 , wherein the additive dispenser is configured to periodically release or spray the additive material into the heat transfer fluid.4. The compressor system of claim 2 , wherein the additive dispenser is configured to dissolve the additive material into the heat transfer fluid passing the additive dispenser.5. The compressor system of claim 1 , wherein the additive material includes one or more of amines (alkyl claim 1 , cyclo ...

SILENCER, AND CENTRIFUGAL COMPRESSOR AND REFRIGERATION SYSTEM HAVING THE SAME

The present invention provides a silencer, including: a silencer housing having an annular plate-like structure, with an annular mounting chamber formed therein; a silencing pad disposed in the mounting chamber; and a positioning portion disposed on the silencer housing and used for fastening the silencer housing. The silencer according to the embodiment of the present invention has an integrated structure, and can desirably avoid the problem of mounting unflatness in a separated structure. Moreover, the silencing pad therein is disposed to surround the entire silencer, which can provide a sound absorption and noise reduction effect more efficiently. 1. A silencer , comprising:a silencer housing having an annular plate-like structure, with an annular mounting chamber formed therein;a silencing pad disposed in the mounting chamber; anda positioning portion disposed on the silencer housing and used for fastening the silencer housing.2. The silencer according to claim 1 , wherein the silencing pad is uniformly arranged in the mounting chamber.3. The silencer according to claim 1 , wherein the silencer housing comprises a circulation surface for an air flow to flow through claim 1 , and a mounting surface for use in mounting; the mounting surface and the circulation surface are located on two sides of the silencer housing respectively; and the positioning portion is disposed on the mounting surface and/or the circulation surface.4. The silencer according to claim 3 , wherein the positioning portion comprises first bolt mounting portions and first mounting bolts fitting the first bolt mounting portions; wherein the first bolt mounting portions are inserted into corresponding mounting grooves in the silencing pad via through holes opened on the mounting surface.5. The silencer according to claim 4 , wherein the first bolt mounting portions are uniformly arranged along the circumference of the silencer housing.6. The silencer according to claim 5 , wherein the first bolt ...

Liquid Sensing for Refrigerant-Lubricated Bearings

A vapor compression system comprises a compressor (). The compressor comprises an inlet () and an outlet () and an electric motor (). The motor has a stator () and a rotor (). A plurality of bearings () support the rotor. A fluid flowpath () extends to the plurality of bearings. A branch () from the fluid flowpath extends to the compressor. A liquid sensor () is along the branch. 122. A vapor compression system comprising a compressor () , the compressor comprising:{'b': 40', '42, 'an inlet () and an outlet (); and'}{'b': '28', 'claim-text': [{'b': '30', 'a stator (); and'}, {'b': '32', 'a rotor ();'}], 'an electric motor () having{'b': '36', 'a plurality of bearings () supporting the rotor;'}{'b': '126', 'a fluid flowpath () to the plurality of bearings;'}{'b': '310', 'a branch () from the fluid flowpath; and'}{'b': '330', 'a liquid sensor () along the branch spaced locally above the fluid flowpath.'}2. (canceled)3. The vapor compression system of wherein:{'b': '330', 'the liquid sensor () is an optical sensor.'}4. The vapor compression system of wherein:{'b': 330', '340, 'the liquid sensor () has a glass prism () exposed to fluid along the branch.'}5. The vapor compression system of further comprising:{'b': '310', 'the branch () extends from the fluid flowpath directly back to the compressor.'}6. The vapor compression system of further comprising:{'b': 300', '302', '304', '330, 'a degas tank () having an inlet () and an outlet () along the fluid flowpath, the liquid sensor () being mounted on the degas tank above the degas tank outlet.'}7. The vapor compression system of wherein:{'b': '330', 'the liquid sensor () is mounted centered at least 25 mm above the outlet of the degas tank.'}8. The vapor compression system of wherein:{'b': '330', 'the liquid sensor () is mounted generally horizontally.'}9. The vapor compression system of wherein:{'b': '330', 'the liquid sensor () is a liquid level switch.'}10. The vapor compression system of wherein:{'b': '330', 'the ...

Vapor Compression System with Refrigerant-Lubricated Compressor

A vapor compression system () comprises: a compressor () having a suction port () and a discharge port (); a heat rejection heat exchanger () coupled to the discharge port to receive compressed refrigerant; a heat absorption heat exchanger (); a first lubricant flowpath () from the heat rejection heat exchanger to the compressor; a second lubricant flowpath () from the heat absorption heat exchanger to the compressor; at least one lubricant pump (); and a controller () configured to control lubricant flow along the first lubricant flowpath and the second lubricant flowpath based on a sensed fluctuation. 120400420. A vapor compression system (; ; ) comprising:{'b': 22', '40', '42, 'a compressor () having a suction port () and a discharge port ();'}{'b': '58', 'a heat rejection heat exchanger () coupled to the discharge port to receive compressed refrigerant;'}{'b': '88', 'a heat absorption heat exchanger ();'}{'b': 120', '126, 'a first lubricant flowpath (, ) from the heat rejection heat exchanger to the compressor;'}{'b': 121', '126, 'a second lubricant flowpath (, ) from the heat absorption heat exchanger to the compressor;'}{'b': '190', 'at least one lubricant pump (); and'}{'b': '900', 'a controller () configured to control lubricant flow along the first lubricant flowpath and the second lubricant flowpath based on a sensed fluctuation.'}2. The system of wherein:the at least one lubricant pump is shared by the first lubricant flowpath and the second lubricant flowpath; and{'b': '192', 'the system comprises a pressure sensor () positioned to measure an outlet pressure of the pump.'}3. The system of wherein:the sensed fluctuation is a sensed fluctuation in an outlet pressure of the pump.4. The system of wherein:the at least one lubricant pump is shared by the first lubricant flowpath and the second lubricant flowpath; and{'b': '193', 'the system comprises a vibration sensor () positioned to measure a vibration of the pump.'}5. The system of wherein:the sensed ...

MOTOR ROTOR AND AIR GAP COOLING

A motor cooling system for a simply supported compressor includes a rotor shaft having a first end and a second end The rotor shaft includes an axial bore and a plurality of shaft radial holes extending from a first end of the axial bore wherein a cooling medium is supplied to the axial bore The cooling system further includes a rotor coupled to the rotor shaft and having a plurality of rotor axial holes and a plurality of rotor radial holes The plurality of rotor radial holes extends from the plurality of rotor axial holes A refrigerant dam is arranged adjacent a first end of the rotor and includes a plurality of dam axial holes fluidly coupled to an interior cavity The dam axial holes align with the rotor axial holes and the interior cavity aligns with the shaft radial holes to form a flow path between the rotor shaft and the rotor 1. A motor cooling system for a simply supported compressor system comprising:a rotor shaft having a first end and a second end, the rotor shaft including an axial bore and a plurality of shaft radial holes extending from a first end of the axial bore, wherein a cooling medium is supplied to the axial bore;a rotor including a plurality of rotor axial holes and a plurality of rotor radial holes extending from the plurality of rotor axial holes, wherein the rotor is coupled to the rotor shaft; anda refrigerant dam arranged adjacent a first end of the rotor, the refrigerant dam including a plurality of dam axial holes fluidly coupled to an interior cavity, wherein the plurality of dam axial holes are aligned with the plurality of rotor axial holes, and the interior cavity is aligned with the plurality of shaft radial holes such that a flow path is formed between the rotor shaft and the rotor.2. The motor cooling system according to claim 1 , wherein the first end of the rotor shaft is supported by a first bearing and the second end of the rotor shaft is supported by a second bearing.3. The motor cooling system according to claim 1 , ...

Low Capacity, Low-GWP, HVAC System

A system ( 20; 300 ) comprises: a vapor compression loop ( 38; 338 ); a low-pressure or medium-pressure refrigerant in the loop; a centrifugal compressor ( 42 ) along the vapor compression loop and comprising: a housing ( 120 ); an inlet ( 44 ); an outlet ( 46 ); an impeller ( 140 ); an electric motor ( 122 ) coupled to the impeller to drive rotation of the impeller; and one or more refrigerant-lubricated bearings ( 130, 132 ).

Compressor configured to control pressure against magnetic motor thrust bearings

A method of controlling, by a controller for a compressor (200), pressure at plurality of magnetic motor thrust bearings (360, 370) for a motor (280) disposed within a housing (220) for the compressor (200), wherein the motor (280) and an impeller (270) are disposed on a compressor shaft (260) within the housing, the method including: monitoring current at each of the plurality of magnetic motor thrust bearings (360, 370), controlling a flow regulator (400) in a bypass loop (380) for the impeller (270) to decrease flow through the bypass loop when a first current in a first of the plurality of magnetic motor thrust bearings (360, 370) exceeds a second current in a second of the plurality of magnetic motor thrust bearings (360, 370), and controlling the flow regulator (400) to increase flow through the bypass loop (380) when the second current exceeds the first current.

Compressor with vibration sensor

A bearing support (26) for a compressor (10) includes an annular body. The annular body includes a circle opening (28) that is configured to receive a bearing (21) and a shaft (20). A tapered portion (30) is tapered away from the circular opening. The tapered portion (30) includes a passage (32). A vibration sensor (34) is situated in the passage. A compressor and a method of sensing vibration adjacent a bearing in a compressor are also disclosed.

HIGH EFFICIENCY CENTRIFUGAL IMPELLER

A balancing weight mountable within a balance hole of a rotary component includes a cylindrical body having a desired weight. An opening is formed in a portion of the body to define a hollow passageway and a mechanism couples the cylindrical body within an interior of the balance hole. 1. A balancing weight mountable within a balance hole of a rotary component , comprising:a cylindrical body having a desired weight;an opening formed in a portion of the body to define a hollow passageway; anda mechanism for coupling the cylindrical body within an interior of the balance hole.2. The balancing weight of claim 1 , wherein the opening is formed at a center of the cylindrical body.3. The balancing weight of claim 1 , wherein the opening is formed adjacent to an outer edge of the cylindrical body.4. The balancing weight of claim 1 , wherein the mechanism includes a plurality of male threads formed about an exterior surface of the cylindrical body.5. A rotating component of a rotary machine claim 1 , comprising:a hub having a front side and a back side, the hub being rotatable about an axis of rotation;a plurality of balance holes extending from the front side to the back side; andat least one balancing weight receivable within one of the plurality of balance holes, such that both mechanical and thrust balancing are provided at any of the plurality of balance holes.6. The rotating component of claim 5 , wherein the plurality of balance holes are substantially identical.7. The rotating component of claim 5 , wherein the plurality of balance holes are spaced circumferentially about a central portion of the hub.8. The rotating component of claim 7 , wherein the plurality of balance holes are equidistantly spaced circumferentially about a central portion of the hub.9. The rotating component of claim 7 , wherein the plurality of balance holes are equidistantly radially spaced relative to the axis of rotation.10. The rotating component of claim 7 , wherein a radial distance of ...

LOW PRESSURE INTEGRATED PURGE

A heating, ventilation, air conditioning and refrigeration system includes a heat transfer fluid circulation loop configured to circulate a refrigerant therethrough, a purge gas outlet in operable communication with the heat transfer fluid circulation loop and at least one gas permeable membrane having a first side in operable communication with the purge gas outlet and a second side. The membrane includes a plurality of pores of a size to allow passage of contaminants through the membrane, while restricting passage of the refrigerant through the membrane, and further restricting passage of a vapor phase corrosion inhibitor through the membrane. A purge unit is in operable communication with the second side of the permeable membrane configured to receive a purge gas from the permeable membrane. 1. A heating , ventilation , air conditioning and refrigeration system comprising:a heat transfer fluid circulation loop configured to circulate a refrigerant therethrough;a purge gas outlet in operable communication with the heat transfer fluid circulation loop;at least one gas permeable membrane having a first side in operable communication with the purge gas outlet and a second side, said membrane comprising a plurality of pores of a size to allow passage of contaminants through the membrane, while restricting passage of the refrigerant through the membrane, and further restricting passage of a vapor phase corrosion inhibitor through the membrane; anda purge unit in operable communication with the second side of the permeable membrane configured to receive a purge gas from the permeable membrane.2. The heating claim 1 , ventilation claim 1 , air conditioning and refrigeration system of claim 1 , wherein the plurality of pores have an average pore diameter of less than 0.50 nm.3. The heating claim 1 , ventilation claim 1 , air conditioning and refrigeration system of claim 1 , wherein the membrane includes a zeolite material.4. The heating claim 1 , ventilation claim 1 , ...

SILENCER FOR A CENTRIFUGAL COMPRESSOR ASSEMBLY

A compressor includes a diffuser section having a diffuser structure and a silencer. The silencer includes a silencer housing defining a cavity and a silencing pad disposed within the cavity, wherein an exposed surface of the silencing pad is arranged in contact with a portion of the diffuser structure. 1. A compressor comprising: a diffuser structure; and', a silencer housing defining a cavity; and', 'a silencing pad disposed within the cavity, wherein an exposed surface of the silencing pad is arranged in contact with a portion of the diffuser structure., 'a silencer including], 'a diffuser section comprising2. The compressor of claim 1 , wherein the diffuser structure include a plurality of vanes claim 1 , the plurality of vanes being arranged in contact with the exposed surface of the silencing pad.3. The compressor of claim 1 , wherein the diffuser structure is fixed.4. The compressor of claim 1 , wherein the diffuser structure is rotatable about an axis.5. The compressor of claim 1 , wherein the diffuser structure is mounted to a first surface of the compressor.6. The compressor of claim 1 , wherein the diffuser structure is integrally formed with a first surface of the compressor.7. The compressor of claim 1 , wherein the silencer is affixed to a surface of the compressor facing the diffuser section.8. The compressor of claim 1 , wherein the silencer is arranged within a circumferential groove formed in a surface of the compressor facing the diffuser section.9. The compressor of claim 1 , wherein the exposed surface of the silencing pad is partially compressed by the contact with the portion of the diffuser structure.10. The compressor of claim 1 , wherein silencing pad is formed from a flexible material.11. The compressor of claim 10 , wherein the silencing pad includes a sound absorbing material.12. The compressor of claim 11 , wherein the silencing pad includes a plurality of sound absorbing material layers.13. The compressor of claim 10 , wherein the ...

HOT GAS BYPASS ENERGY RECOVERY

System includes a compressor having a compressor suction port and a compressor discharge port; a heat rejection heat exchanger fluidly coupled to the compressor discharge port; an expansion device fluidly coupled to an outlet of the heat rejection heat exchanger; a heat absorption heat exchanger fluidly coupled to the expansion device; a hot gas bypass line fluidly coupled to the compressor discharge port; an ejector comprising a motive port fluidly coupled to the hot gas bypass line, a suction port fluidly coupled to an outlet of the heat absorption heat exchanger and a discharge port fluidly coupled to the compressor suction port; a hot gas bypass valve positioned between the compressor discharge port and the motive port of the ejector; a flow control valve fluidly coupled to the outlet of the heat absorption heat exchanger, and fluidly coupled to the suction port of the ejector and the compressor suction port. 1. A refrigerant vapor compression system comprising:a compressor having a compressor suction port and a compressor discharge port;a heat rejection heat exchanger fluidly coupled to the compressor discharge port;an expansion device fluidly coupled to an outlet of the heat rejection heat exchanger;a heat absorption heat exchanger fluidly coupled to the expansion device;a hot gas bypass line fluidly coupled to the compressor discharge port;an ejector comprising a motive port fluidly coupled to the hot gas bypass line, a suction port fluidly coupled to an outlet of the heat absorption heat exchanger and a discharge port fluidly coupled to the compressor suction port;a hot gas bypass valve positioned between the compressor discharge port and the motive port of the ejector;a flow control valve fluidly coupled to the outlet of the heat absorption heat exchanger, and fluidly coupled to the suction port of the ejector and the compressor suction port.2. The refrigerant vapor compression system of further comprising:a controller configured to control the hot gas ...

CENTRIFUGAL COMPRESSOR WITH RECIRCULATION PASSAGE

An example centrifugal compressor includes a housing that defines an inlet chamber and includes first and second openings that define a recirculation passage in fluid communication with the inlet chamber. An impeller is disposed within the housing and is rotatable about a longitudinal axis to draw fluid into the inlet chamber. The first and second openings are at different axial locations along the longitudinal axis. A plurality of inlet guide vanes are rotatable and situated in the inlet chamber. The centrifugal compressor includes a ring and a controller for moving the ring along the longitudinal axis between a first position and a second position when rotating the inlet guide vanes. The ring obstructs at least one of the first and second openings more in the second position than in the first position. 1. A centrifugal compressor comprising:a housing defining an inlet chamber and comprising first and second openings that define a recirculation passage in fluid communication with the inlet chamber;an impeller within the housing and rotatable about a longitudinal axis to draw fluid into the inlet chamber, the first and second openings at different axial locations along the longitudinal axis;a plurality of inlet guide vanes that are rotatable and situated in the inlet chamber;a ring; anda controller for moving the ring along the longitudinal axis between a first position and a second position when rotating the inlet guide vanes, wherein the ring obstructs at least one of the first and second openings more in the second position than in the first position.2. The centrifugal compressor of claim 1 , wherein the ring is configured to move towards the first position to decrease obstruction of the second opening claim 1 , and the ring the ring is configured to move towards the second position to increase obstruction of the second opening.3. The centrifugal compressor of claim 2 , wherein the inlet guide vanes are configured to rotate to reduce fluid flow to the impeller as ...

DIFFUSER FOR A CENTRIFUGAL COMPRESSOR AND CENTRIFUGAL COMPRESSOR HAVING THE SAME

A diffuser for a centrifugal compressor and a centrifugal compressor having the same. The diffuser () comprises a drive component (), a transmission assembly (), an adjustment assembly (), a spool valve assembly () and a rear wall (); wherein the transmission assembly is used for transmitting power produced by the drive component to the adjustment assembly, the adjustment assembly is capable of circumferentially reciprocating with respect to the rear wall and driving the spool valve assembly to reciprocate axially; and wherein a rolling element () is provided between the adjustment assembly and the rear wall. Intervention of a mechanism for adjusting a flow passage width is better achieved by such an arrangement in combination with an existing configuration of the diffuser; and a low-friction fit between the adjustment assembly and the rear wall is achieved by the rolling element. 1. A diffuser for a centrifugal compressor , characterized in that , the diffuser comprises a drive component , a transmission assembly , an adjustment assembly , a spool valve assembly and a rear wall; wherein the transmission assembly is used for transmitting power produced by the drive component to the adjustment assembly , the adjustment assembly is capable of reciprocating circumferentially with respect to the rear wall and driving the spool valve assembly to reciprocate axially; and wherein a rolling element is provided between the adjustment assembly and the rear wall.2. The diffuser according to claim 1 , characterized in that claim 1 , the rolling element is a ball bearing which comprises: a ball cage with openings provided circumferentially; balls arranged in the opening; and a baffle for limiting axial movement of the ball cage; wherein the ball cage is arranged circumferentially between an inner side of the adjustment assembly and an outer side of the rear wall.3. The diffuser according to claim 1 , characterized in that claim 1 , the transmission assembly comprises a crank and ...

CENTRIFUGAL COMPRESSOR AND METHOD OF OPERATING THE SAME

The invention relates to a centrifugal compressor and a method of operating the same. A centrifugal compressor of the invention includes an impeller, a diffuser and a variable diffusion system, wherein the diffuser is disposed downstream of the impeller and has a respective diffuser frame that defines at least a channel through which the fluid flows from the impeller; moreover, the variable diffusion system comprises a movable body that is able to move relative to the channel and an electromagnetic actuating device, and the electromagnetic actuating device controls the movable body to move relative to the channel in an electromagnetic driving manner. The variable diffusion system of the centrifugal compressor in the invention is simple in implementation structure, low in cost, easy to operate and good in stability and reliability. 1. A centrifugal compressor comprising:an impeller for sucking a fluid to be compressed;a diffuser disposed downstream of the impeller and having a respective diffuser frame, wherein the diffuser frame defines at least a channel through which the fluid flows from the impeller; anda variable diffusion system;characterized in that the variable diffusion system comprises:a movable body that is able to move relative to the channel; andan electromagnetic actuating device for controlling the movable body to move relative to the channel in an electromagnetic driving manner.2. The centrifugal compressor according to claim 1 , wherein the electromagnetic actuating device comprises:an electromagnetic driving execution assembly for generating a controllable magnetic field to drive the movable body to move towards a target position at least partially blocking the channel;a displacement transducer for sensing position information of the movable body relative to the channel; anda controller;wherein the position information is sensed and fed back to the controller by the displacement transducer, and the controller is configured for controlling an ...

CENTRIFUGAL COMPRESSOR INLET GUIDE VANE CONTROL

A method of positioning an inlet guide vane assembly before start-up of a chiller system including a compressor, a condenser, and a cooler is provided including receiving a first input form sensors located in the cooler and the condenser. A saturation temperature is calculated based on the input from the sensors. A second input indicative of a minimum speed of a motor coupled to the compressor at start-up is received. Using the calculated saturation temperature and the second input, an allowable position of the inlet guide vane assembly is determined. The inlet guide vane assembly is then moved to the determined allowable position. and determine which is greater. 1. A method of positioning an inlet guide vane assembly before start-up of a chiller system including a compressor , a condenser , and a cooler , the method comprising:receiving a first input from sensors located in the cooler and the condenser;calculating a saturation temperature based on the input from the sensors;receiving a second input indicative of a minimum speed of a motor coupled to the compressor at start-up;determining an allowable position of the inlet guide vane assembly based on the calculated maximum saturation temperature and the second input; andmoving the inlet guide vane assembly to the determined allowable position.2. The method according to claim 1 , wherein the chiller system includes a control system having a controller.3. The method according to claim 1 , wherein the first input from the sensors is provided to a controller.4. The method according to claim 1 , wherein the sensors located in the cooler and condenser are pressure sensors.5. The method according to claim 1 , wherein the sensors located in the cooler and condenser are temperature sensors.6. The method according to claim 5 , further comprising converting the first input from the temperature sensors into a pressure to calculate the saturation temperature.7. The method according to claim 2 , wherein an algorithm for ...

ROTATING DIFFUSER IN CENTRIFUGAL COMPRESSOR

A centrifugal compressor includes a shaft defining an axis, an impeller mounted to the shaft for rotation about the axis, and a diffuser section including a first wall, a second wall, and an opening defined between the first wall and the second wall. The opening of the diffuser section is arranged in fluid communication with the impeller. The first wall is rotatable about the axis and rotation of the first wall about the axis is mechanically driven. 1. A centrifugal compressor comprises:a shaft defining an axis;an impeller mounted to the shaft for rotation about the axis;a diffuser section including a first wall, a second wall, and an opening defined between the first wall and the second wall, the opening of the diffuser section being arranged in fluid communication with the impeller, wherein the first wall is rotatable about the axis and rotation of the first wall about the axis is mechanically driven.2. The centrifugal compressor of claim 1 , wherein the first wall includes a plurality of pieces and at least one of the plurality of pieces is mechanically driven about the axis.3. The centrifugal compressor of claim 1 , wherein rotation of the first wall about the axis is mechanically driven by at least one of the impeller and the shaft.4. The centrifugal compressor of claim 1 , wherein rotation of the first wall about the axis is mechanically driven by a motor.5. The centrifugal compressor of claim 1 , wherein the second wall is stationary.6. The centrifugal compressor of claim 1 , wherein the second wall is rotatable about the axis.7. The centrifugal compressor of claim 6 , wherein the first wall is rotatable about the axis at a first speed and the second wall is rotatable about the axis at a second speed claim 6 , the first speed being distinct from the second speed.8. The centrifugal compressor of claim 6 , wherein the first wall and the second wall are connected by at least one coupler.9. The centrifugal compressor of claim 8 , wherein the at least one coupler ...

Vapor Compression System with Refrigerant-Lubricated Compressor

A vapor compression system (20, 400, 420, 440, 460, 480) has: a compressor (22) having a suction port (40) and a discharge port (42); a heat rejection heat exchanger (58) coupled to the discharge port to receive compressed refrigerant; a heat absorption heat exchanger (88); a first lubricant flowpath (120, 126; 120) from the heat rejection heat exchanger to the compressor; a second lubricant flowpath (121, 126; 121) from the heat absorption heat exchanger to the compressor; at least one lubricant pump (190; 190, 191); at least one liquid level sensor (180, 181; 180, 181, 330); and a controller (900) configured to control lubricant flow along the first lubricant flowpath and the second lubricant flowpath based output based on output of the at least one liquid level sensor.

Centrifugal Compressor Open Impeller

A centrifugal compressor impeller () has a hub () having a gaspath surface () extending from a leading end to a trailing end. A plurality of blades (A, B; ) extend from the hub gaspath surface and each have: a leading edge (A, B; ); a trailing edge (A, B; ); a first face (A, B; ); a second face (A, B; ); and a tip (A, B; ). A plurality of flow splitter segments () extend between associated twos of the blades and each spaced from both the hub gaspath surface and the tips of the associated two blades. 160160. A centrifugal compressor impeller (; ) comprising:{'b': 62', '162', '64', '164, 'a hub (; ) having a gaspath surface (; ) extending from a leading end to a trailing end;'}{'b': 70', '70', '170, 'claim-text': [{'b': 72', '72', '172, 'a leading edge (A, B; );'}, {'b': 74', '74', '174, 'a trailing edge (A, B; );'}, {'b': 80', '80', '180, 'a first face (A, B; );'}, {'b': 82', '82', '182, 'a second face (A, B; ); and'}, {'b': 78', '78', '178, 'a tip (A, B; ); and'}], 'a plurality of blades (A, B; ) extending from the hub gaspath surface and each having{'b': 120', '122', '320', '322, 'a plurality of flow splitter segments (, ; , ) extending between associated twos of the blades and each spaced from both the hub gaspath surface and the tips of the associated two blades.'}260160. The compressor impeller (; ) of wherein:{'b': 120', '122', '320', '322, 'the plurality of flow splitter segments (, ; , ) is within an upstream third or a downstream third of a flowpath length from the leading edges to the trailing edges.'}360160. The compressor impeller (; ) of wherein:{'b': 120', '320', '122', '320, 'the plurality of flow splitter segments is a first plurality of flow splitter segments (; ) and the impeller further comprises a second plurality of flow splitter segments (; ) extending between the blades and spaced from both the hub gaspath surface and the tips of the blades.'}460160. The compressor impeller (; ) of wherein:{'b': 120', '320, 'the first plurality of flow splitter ...

REFRIGERATION SYSTEM MIXED-FLOW COMPRESSOR

An impeller mountable within a centrifugal compressor includes a hub having a front side and a back side, the hub being rotatable about an axis of rotation and a plurality of vanes extending outwardly from the front side of the hub such that a plurality of passages is defined between adjacent vanes. The plurality of vanes is oriented such that a flow output from the plurality of passages adjacent the back side of the impeller is arranged at an angle to the axis of rotation of less than 20 degrees. 1. An impeller mountable within a centrifugal compressor , comprising:a hub having a front side and a back side, the hub being rotatable about an axis of rotation;a plurality of vanes extending outwardly from the front side of the hub such that a plurality of passages are defined between adjacent vanes, the plurality of vanes oriented such that a flow output from the plurality of passages adjacent the back side of the impeller is arranged at an angle to the axis of rotation, the angle being less than 20 degrees.2. The impeller of claim 1 , wherein the angle of the flow output from the plurality of passages is less than 10 degrees.3. The impeller of claim 1 , wherein the flow output from the plurality of passages is arranged generally parallel to the axis of rotation.4. A centrifugal compressor comprising:a casing;an impeller arranged within the casing, the impeller being rotatable about an axis;a diffuser section arranged within the casing, the diffuser section being positioned axially downstream from an outlet of the impeller.5. The centrifugal compressor of claim 4 , wherein the diffuser section further comprises:a diffuser structure; andan axial flow passage defined between an exterior surface of the diffuser structure and an interior surface of the casing.6. The centrifugal compressor of claim 5 , wherein the diffuser structure is generally cylindrical in shape.7. The centrifugal compressor of claim 5 , wherein the diffuser structure is fixed relative to the axis.8. ...

Two-Stage Centrifugal Compressor

A compressor () comprises: a housing (); a shaft (); a plurality of bearings () mounting the shaft to the housing for relative rotation about an axis (); and a motor (). The motor has: a rotor () mounted on the shaft; and a stator (). A first impeller (A) is mounted the shaft to a first side of the motor. A second impeller (B) is mounted the shaft to a second side of the motor. The first impeller is an open impeller and the second impeller is a shrouded impeller. 2. The compressor of wherein:the first impeller has an axial inlet and a radial outlet; andthe second impeller has an axial inlet and a radial outlet.3. The compressor of wherein:the first impeller inlet and the second impeller inlet face outward from the motor in opposite axial directions.4. The compressor of further comprising:{'b': '140', 'a radial balance piston seal () sealing the first impeller.'}5. The compressor of further comprising:{'b': '160', 'an axial balance piston seal () sealing the second impeller.'}6. The compressor of further comprising:{'b': '170', "a radial seal () sealing the second impeller's shroud."}7. The compressor of wherein:the first impeller is of a stage; andthe second impeller is of another stage in series with the stage.8. The compressor of wherein:{'b': '68', 'the plurality of bearings comprises a magnetic thrust bearing ().'}9. The compressor of wherein:{'b': 66', '67, 'the plurality of bearings further comprises a first magnetic radial bearing () and a second magnetic radial bearing ().'}10. The compressor of further comprising:a controller configured to control the magnetic thrust bearing to vary clearance of the first impeller.11. A method for using the compressor of claim 8 , the method comprising:controlling the magnetic thrust bearing to vary clearance of the first impeller.12. The method of wherein:the varying includes reducing the clearance of the first impeller to increase a sealing engagement of a seal of the second impeller.1317.-. (canceled) Benefit is claimed ...

Diffuser Restriction Ring

A centrifugal compressor () comprises: a housing (); an impeller () having an axial inlet () and a radial outlet (); a diffuser (); and a control ring () mounted for shifting between an inserted position and a retracted position. The control ring comprises means ( ) for absorbing pulsations. 120. A centrifugal compressor () comprising:{'b': '26', 'a housing ();'}{'b': 34', '70', '72, 'an impeller () having an axial inlet () and a radial outlet ();'}{'b': '82', 'a diffuser (); and'}{'b': '90', 'a control ring () mounted for shifting between an inserted position and a retracted position, wherein the control ring comprises{'b': 150', '160', '162', '166, 'means (, , , ) for absorbing pulsations.'}2. The centrifugal compressor of wherein:the means absorbs said pulsations associated with a passing frequency of the impeller.3. The centrifugal compressor of wherein:{'b': '150', 'the means comprises a sleeve portion of the control ring having a pulsation-damping material ().'}4. The centrifugal compressor of wherein:{'b': 160', '162', '166, 'the means comprises a sleeve portion of the control ring having a foraminate layer (, , ).'}520. A centrifugal compressor () comprising:{'b': '26', 'a housing ();'}{'b': 34', '70', '72, 'an impeller () having an axial inlet () and a radial outlet ();'}{'b': '82', 'a diffuser (); and'}{'b': '90', 'a control ring () mounted for shifting between an inserted position and a retracted position, wherein the control ring comprises{'b': 160', '162', '166, 'a sleeve portion having a foraminate layer (, , ).'}6. The centrifugal compressor of wherein:the sleeve portion of the control ring has a pulsation-damping material.7. The centrifugal compressor of wherein:{'b': '160', 'the foraminate layer is a radially inboard foraminate layer ();'}{'b': '162', 'the sleeve portion has a radially outboard foraminate layer (); and'}{'b': '150', 'the pulsation-damping material () is between the inboard foraminate layer and the outboard foraminate layer.'}8. The ...

INLET GUIDE VANE MECHANISM

An inlet guide vane assembly () is provided including a plurality of vane subassemblies () configured to rotate relative to a blade ring housing () to control a volume of air flowing there through. The inlet guide vane assembly () also includes a plurality of drive mechanisms (). Each drive mechanism () is operably coupled to one of the plurality of vane subassemblies (). The vane subassemblies () may be rotated independently. 1. An inlet guide vane assembly , comprising:a plurality of vane subassemblies configured to rotate relative to a blade ring housing to control a volume of air flowing there through; anda plurality of drive mechanisms, each of which is operably coupled to one of the plurality of vane subassemblies such that the vane subassemblies may be rotated independently.2. The inlet guide vane assembly according to claim 1 , wherein the drive mechanisms are selected from one of an actuator claim 1 , stepper motor claim 1 , and servo motor.3. The inlet guide vane assembly according to claim 1 , wherein each vane subassembly includes a flat air foil vane connected to a vane shaft.4. The inlet guide vane assembly according to claim 3 , wherein a coupling directly couples each vane shaft to a shaft of one of the plurality of drive mechanisms.5. The inlet guide vane assembly according to claim 1 , wherein the plurality of drive mechanisms are arranged adjacent the blade ring housing within a cavity of a suction housing.6. The inlet guide vane assembly according to claim 5 , wherein the suction housing includes a cover connected to a back plate to form the cavity.7. The inlet guide vane assembly according to claim 1 , wherein the inlet guide vane assembly is arranged within a cavity of a suction housing and the plurality of drive mechanisms is located adjacent an exterior surface of the suction housing.8. The inlet guide vane assembly according to claim 1 , wherein the inlet guide vane assembly is arranged within a cavity of a suction housing and a portion of ...

Refrigerant lubrication system with side channel pump

A vapor compression system includes a compressor that has a suction port and a discharge port. A heat rejection heat exchanger is coupled to the discharge port to receive compressed refrigerant. A heat absorption heat exchanger is coupled to the suction port. A lubricant flowpath goes from the heat absorption heat exchanger to the compressor. A side channel pump is located in the lubricant flowpath.

SEAL ASSEMBLY FOR COMPRESSOR

A seal assembly for a compressor includes at least one impeller. At least one seal land is associated with the impeller including a plurality of radially stepped surfaces. A seal is associated with each of at least one seal lands. The seal includes a plurality of radially stepped projections corresponding to the plurality of radially stepped surfaces on at least one seal land. At least one actuator is configured to move at least one seal land relative to the seal. 1. A seal assembly for a compressor comprising:at least one impeller;at least one seal land associated with the impeller including a plurality of radially stepped surfaces;a seal associated with each of the at least one seal lands, wherein the seal includes a plurality of radially stepped projections corresponding to the plurality of radially stepped surfaces on the at least one seal land; andat least one actuator configured to move the at least one seal land relative to the seal.2. The assembly of claim 1 , wherein the at least one actuator is configured to move the seal between a first axial position and a second different axial position.3. The assembly of claim 1 , wherein the at least one seal land is attached to one of the impeller and a housing assembly and the seal attached to the other of the impeller and the housing assembly.4. The assembly of claim 1 , wherein the plurality of radially stepped projections include distal ends with an increasing radially dimension in a first axial direction and adjacent ones of the plurality of radially stepped projections are separated by a trough.5. The assembly of claim 4 , wherein the plurality of radially stepped surfaces include an increasing radial dimension in the first axial direction.6. The assembly of claim 5 , wherein the first axial direction is an axially aft direction.7. The assembly of claim 1 , wherein the seal is fixed relative to a housing assembly of the compressor and the at least one seal land is fixed relative to the impeller.8. The assembly ...

Economizer chamber for minimizing pressure pulsations

A baffle for use in a refrigerator apparatus comprises a baffle plate comprising a first and a second opposing sides attached to an inner surface of the refrigerator apparatus, a baffle seal plate attached along a third side of the baffle plate, the baffle plate seal plate attached to the inner surface of the refrigerator apparatus.

Centrifugal pump with slanted cutwater for cavitation prevention

A pump (20) has a housing (22) having an inlet (26) and an outlet (28). An impeller (30) is held by the housing for rotation about an impeller axis (500). The housing defines a cutwater off parallel to the impeller axis by at least 3° over at least 50 percent of an axial span of the cutwater.

Economized centrifugal compressor

A compressor (22; 260; 300; 400) has a housing assembly (140) with a suction port (24), a discharge port (26), and an economizer port (58). An impeller (154) is mounted to be driven in at least a first condition so as to draw a main flow of fluid through the suction port and discharge the fluid from the discharge port. A diffuser (220; 302; 402) has a plurality of diffuser passages (222; 310, 308; 403). Each diffuser passage has an inlet (224) positioned to receive fluid from the impeller and an outlet (220) downstream of the inlet in the first condition. One or more passages (230, 231, 232, 234, 236, 268; 320, 330, 332; 412) are positioned to draw an economizer flow of fluid from the economizer port and deliver the economizer flow downstream of the impeller inlet (212) but upstream of the diffuser passage outlets (226).

Centrifugal compressor and method of operating the same

A centrifugal compressor and a method of operating a centrifugal compressor. The centrifugal compressor includes: an impeller configured to suction a gas to be compressed; a diffuser disposed downstream of the impeller to pressurize the gas, the diffuser comprising a movable ring, a main passage in which the gas flows past the ring, and an openable branch passage; and a circulation loop comprising an inlet and an outlet, the outlet being in communication with an inlet of the impeller; the branch passage is disposed to be in communication with the main passage and the circulation loop when the ring moves into the main passage so that a portion of the gas in the main passage passes through the circulation loop and returns to the impeller so as to be suctioned, and to be closed when the ring is withdrawn from the main passage.

Muffler for noise reduction

A muffler assembly, comprising an outer muffler assembly comprising a plurality of fiberglass discs and a plurality of reactive plates, and an inner muffler assembly comprising a plurality of fiberglass discs and a plurality of reactive plates the inner muffler assembly generally surrounded by the outer muffler assembly and defining therebetween a gas flow gap.

Transmission oil containment system

Compressor with bearings and dispenser for additives

Mixed-flow compressor with counter-rotating diffuser

A compressor includes a housing. An impeller is located within the housing and rotatable about an impeller axis in a first rotational direction. A rotor section is rotatable about the impeller axis in a second rotational direction opposite the first rotational direction.

Device for removing parasitic losses in a refrigeration unit

Support mechanism of inner ring for variable pipe diffuser

A ring support system for use in a variable pipe diffuser. The ring support mechanism includes at least three axle shafts and at least three roller bearings rotatably mounted to the axle shafts, an inner ring having a groove disposed in the outside diameter, and an outer ring having a corresponding groove disposed in the inside diameter. The at least three axle shafts are circumferentially mounted in the outer ring such that the rollers are positioned partially within the groove of the outer cylinder such that the roller bearings define a diameter nearly equal to the outside diameter of the inner ring. The inner ring is positioned within the at least three roller bearings such that the at least three roller bearings are in axial sliding contact with the groove of the inner ring and in rolling contact with the groove of the inner ring. The ring support system provides rotational and axial support of the inner ring.

Diffuser for a centrifugal compressor and a centrifugal compressor having the same

A diffuser for a centrifugal compressor and a centrifugal compressor having the same. The diffuser (100) comprises a drive component (110), a transmission assembly (120), an adjustment assembly (130), a spool valve assembly (140) and a rear wall (150); wherein the transmission assembly is used for transmitting power produced by the drive component to the adjustment assembly, the adjustment assembly is capable of circumferentially reciprocating with respect to the rear wall and driving the spool valve assembly to reciprocate axially; and wherein a rolling element (160) is provided between the adjustment assembly and the rear wall. Intervention of a mechanism for adjusting a flow passage width is better achieved by such an arrangement in combination with an existing configuration of the diffuser; and a low-friction fit between the adjustment assembly and the rear wall is achieved by the rolling element.

Silencer, and centrifugal compressor and refrigeration system having the same

The present invention provides a silencer, including: a silencer housing having an annular plate-like structure, with an annular mounting chamber formed therein; a silencing pad disposed in the mounting chamber; and a positioning portion disposed on the silencer housing and used for fastening the silencer housing. The silencer according to the embodiment of the present invention has an integrated structure, and can desirably avoid the problem of mounting unflatness in a separated structure. Moreover, the silencing pad therein is disposed to surround the entire silencer, which can provide a sound absorption and noise reduction effect more efficiently.

Active filter for oil-free refrigerant compressor

A compressor system includes a compressor including a compressor inlet, a compressor outlet, and a bearing assembly, the compressor configured to compress a heat transfer fluid. An additive dispenser is fluidly coupled to the compressor upstream of the bearing assembly. The additive dispenser is configured to controllably release a volume of an additive material into the heat transfer fluid, the additive material configured to lubricate the bearing assembly. A method of lubricating a bearing assembly of compressor includes locating a volume of additive material at an additive dispenser fluidly coupled to a compressor, dispensing a portion of the additive material into the flow of heat transfer fluid at a selected time, flowing the heat transfer fluid containing the additive material to a bearing assembly of the compressor, and lubricating the bearing assembly of the compressor with the additive material.

Compressor muffler

Hot gas bypass for two-stage compressor

A vapor compression system comprising a centrifugal compressor (22) having: an inlet (24); an outlet (26); a first impeller stage (28); a second impeller stage (30); and a motor (34) coupled to the first impeller stage and second impeller stage. A first heat exchanger (38) is downstream of the outlet along a refrigerant flowpath. An expansion device (56) and a second heat exchanger (64) are upstream of the inlet along the refrigerant flowpath. A bypass flowpath (120; 320) is positioned to deliver refrigerant from the compressor bypassing the first heat exchanger. A valve (128) is positioned to control flow through the bypass flowpath, wherein: the bypass flowpath extends from a first location (140) intermediate the inlet and outlet to a second location (142; 342) downstream of the first heat exchanger along the refrigerant flowpath.

Compressor surge detection

A compressor (22) has a housing assembly (50) with a suction port (24) and a discharge port (26). A shaft (70) is mounted for rotation about an axis (500) and an impeller (44) is mounted to the shaft to be driven in at least a first condition so as to draw fluid in through the suction port and discharge the fluid from the discharge port. A mag¬ netic bearing system (66, 67, 68) supports the shaft. A controller (84) is coupled to a sensor (80, 82) and configured to detect at least one of surge and pre-surge rotating stall and, responsive to said detection, take action to prevent or counter surge.

Multistage compressor with swirl-reducing ribs

An illustrative example embodiment of a multistage compressor includes a first compressor stage, a second compressor stage downstream of the first compressor stage, and a motor section between the first compressor stage and the second compressor stage. The motor section includes a housing and a motor within the housing. A space between the motor and the housing establishes a flow path for fluid to flow from the first compressor stage to the second compressor stage. A plurality of ribs within the space have a curvature along at least a portion of a length of the ribs that changes a direction of fluid flow within the space such that the fluid flows downstream of the curvature in a direction parallel to a longitudinal axis of the housing.

TRANSMISSION OIL CONTAINMENT SYSTEM.

HAY UNA CUBIERTA DE ENGRANAJES (59) RODEANDO DE CERCA AL ENGRANAJE IMPULSOR (31) DE UN COMPRESOR CENTRIFUGO (31) DE MODO QUE EL ACEITE QUE DE OTRO MODO PUDIERA SER EXPULSADO HACIA AFUERA A MODO DE VAPOR A SER ARRASTRADO E INTRODUCIDO EN EL REFRIGERANTE, QUEDARA CONFINADO Y DIRIGIDO HASTA ENTRAR EN EL COLECTOR (44). PARA EVITAR LA AGITACION LOCALIZADA EN EL COLECTOR (44) Y LA CAVITACION RESULTANTE EN LA BOMBA DEL ACEITE (53), QUE SE PUEDE ORIGINAR DEBIDO AL FLUJO A ALTA VELOCIDAD DE LA MEZCLA DE ACEITE Y GAS DE REFRIGERACION DE LA CUBIERTA DE ENGRANAJES (59), HAY UNA PLACA DE DESVIACION (78) SOBRE LA BOMBA DEL ACEITE (53) PARA DESVIAR LA ENTRADA DE ACEITE Y EL GAS ARRASTRADO A OTRAS AREAS DEL COLECTOR (44). THERE IS A COVER OF GEARS (59) SURROUNDING NEAR THE DRIVE GEAR (31) OF A CENTRIFUGAL COMPRESSOR (31) SO THAT THE OIL WHICH OTHERWISE COULD BE EJECTED OUTSIDE AS A STEAM AND INTRODUCED. , YOU WILL BE CONFINED AND DIRECTED UNTIL YOU ENTER THE MANIFOLD (44). TO AVOID THE AGITATION LOCATED IN THE COLLECTOR (44) AND THE RESULTING CAVITATION IN THE OIL PUMP (53), WHICH CAN BE DUE TO THE HIGH SPEED FLOW OF THE OIL MIXTURE AND COOLING GAS OF THE GEAR COVER (59 ), THERE IS A DEVIATION PLATE (78) ON THE OIL PUMP (53) TO DIVERT THE OIL INLET AND THE GAS TRAILED TO OTHER AREAS OF THE COLLECTOR (44).

Compressor sound suppression

A compressor has first and second enmeshed rotors: rotating about first and second axes. The first rotor is supported by a bearing system carried by a bearing case. The bearing case has at least a first port to a discharge plenum. A first sound-absorbing material is positioned within the first port.

Compressor muffler

A compressor has first and second enmeshed rotors rotating about first and second axes to pump refrigerant to a discharge plenum. The compressor includes a muffler system comprising a sound absorbing first element and a sound absorbing second element. The second element at least partially surrounds the first element and defines a generally annular flow path portion between the first element and the second element At least one of the first and second elements comprises an expanded bead material.

Subcooler level control for a turbine expansion refrigeration cycle

A single-fluid two-phase turbine expander is employed in a compression-expansion refrigeration system. The turbine has nozzles of fixed, predetermined orifice and is designed for optimal operation in steady-state normal conditions. A main float valve governs the refrigerant flow to the turbine expander. In order to accommodate off-design conditions, a bypass conduit carries liquid refrigerant around the turbine expander directly to the evaporator. In this case a bypass float valve opens the bypass conduit when the liquid level in the condenser sump reaches a predetermined high level. Alternatively, a float switch and a bypass solenoid can be employed.

Balance piston and seal arrangement

An Abstract of the Disclosure A labyrinth seal is provided to isolate the transmission from a balance piston of a centrifugal compressor, the labyrinth seal being pressurized with refrigerant vapor from the motor chamber, which vapor is at a pressure slightly above that in the transmission, to thereby minimize the efficiency losses that would otherwise occur from leakage of the vapor into the transmission and to the compressor suction.

Flushing of a touchdown bearing

Vaneless supersonic diffuser for compressor

A mixed-flow compressor includes an impeller attached to a shaft and rotatable about a shaft axis. A vaneless diffuser is located axially downstream of the impeller and has a converging portion and a diverging portion. A vaned diffuser is located axially downstream of the vaneless diffuser.

Cooling circuit with relaxation in a turbine with a turbine bypass

Inlet guide vane mechanism

An inlet guide vane assembly ( 60 ) is provided including a plurality of vane subassemblies ( 62 ) configured to rotate relative to a blade ring housing ( 64 ) to control a volume of air flowing there through. The inlet guide vane assembly ( 60 ) also includes a plurality of drive mechanisms ( 80 ). Each drive mechanism ( 80 ) is operably coupled to one of the plurality of vane subassemblies ( 62 ). The vane subassemblies ( 62 ) may be rotated independently.

SYSTEM TO CONTAIN TRANSMISSION OIL.

Compressor muffler

A compressor has first and second enmeshed rotors rotating about first and second axes to pump refrigerant to a discharge plenum. The compressor includes a muffler system comprising a sound absorbing first element and a sound absorbing second element. The second element at least partially surrounds the first element and defines a generally annular flow path portion between the first element and the second element At least one of the first and second elements comprises an expanded bead material.

Lubrication System for Touchdown Bearings of a Magnetic Bearing Compressor

A vapor compression system includes a compressor, a condenser, an expansion device and an evaporator. Refrigerant circulates though the closed circuit vapor compression system. Touchdown bearings protect a rotor during power shutdown of the compressor. Liquid refrigerant from the condenser flows along a supply line and lubricates the touchdown bearings. The refrigerant from the touchdown bearings is discharged through an outlet and flows along a discharge line to the evaporator.

Mixed-flow compressor configuration for a refrigeration system

A centrifugal compressor includes a casing. An impeller is arranged within the casing. The impeller is rotatable about an axis. A diffuser section is arranged within the casing. The diffuser section is positioned axially downstream from an outlet of the impeller and includes a forward portion fixed relative to the impeller and an aft portion distinct from the forward portion.

System for removing parasitic losses in a refrigeration unit

Related components of a refrigeration system (10) are cooled by refrigerant drawn from the system condenser (12) by a pump (37) which serves to raise the pressure of the condensate and move the condensate through the system related component (30,32,34). The condensate is reduced to a vapor as it absorbs parasitic heat losses in the components (30,32,34) and is returned to the condenser (12) where the parasitic heat losses are carried out of the system by the condenser coolant so that the system performance is not adversely effected.

Lubrication supply system

Flushing of a touchdown bearing

A compressor with a touchdown bearing and a supply line for injecting a working fluid toward the touchdown bearing, and a vapor compression system incorporating the same are provided. The supply line injects working fluid approximately continuously when the compressor is operational. The compressor includes a magnetic bearing for levitating the rotating shaft when the compressor is operational. The touchdown bearing is used to support the rotating shaft when the compressor is shutdown. The touchdown bearing may be disposed, at least partially, between a pair of races. The injecting of the working fluid may cause the touchdown bearing to rotate between the races. The injecting of the working fluid may help mitigate a buildup of a debris between the touchdown bearing and the races.

Centrifugal compressor and method of operating the same

Centrifugal compressor and method of operating the same

A centrifugal compressor and a method of operating a centrifugal compressor. The centrifugal compressor includes: an impeller configured to suction a gas to be compressed; a diffuser disposed downstream of the impeller to pressurize the gas, the diffuser comprising a movable ring, a main passage in which the gas flows past the ring, and an openable branch passage; and a circulation loop comprising an inlet and an outlet, the outlet being in communication with an inlet of the impeller; the branch passage is disposed to be in communication with the main passage and the circulation loop when the ring moves into the main passage so that a portion of the gas in the main passage passes through the circulation loop and returns to the impeller so as to be suctioned, and to be closed when the ring is withdrawn from the main passage.

Refrigerant lubrication system with side channel pump

Magnetic bearing compressor protection

Lubricación de cojinetes de lámina

Se proporcionan un conjunto de compresor, un sistema de compresión de vapor 800 que lo incorpora y un método para operar el sistema de compresión de vapor 800. El conjunto compresor incluye un motor 130 para impulsar un eje giratorio 140, un cojinete de lámina 110 para soportar el eje giratorio 140, un mecanismo de compresión 121 para aumentar la presión de un fluido de trabajo, una línea de suministro 150 en comunicación fluida con el mecanismo de compresión 121. y un aparato de calentamiento para calentar el fluido de trabajo. La línea de suministro 150 está configurada para inyectar el fluido de trabajo (por ejemplo, desde aguas abajo del mecanismo de compresión 121) hacia el cojinete de lámina 110. El método proporciona el control de la temperatura del fluido de trabajo. Cuando la temperatura del fluido de trabajo es inferior a 3°F (1,7°C) de sobrecalentamiento, se calienta antes de inyectarlo hacia el cojinete de lámina 110. El calentamiento del fluido de trabajo evita, o al menos mitiga, la transferencia de líquido. al cojinete de lámina 110. (Traducción automática con Google Translate, sin valor legal)

Vapor compression system with refrigerant-lubricated compressor

A vapor compression system (440; 480) comprises: a compressor (22) having a suction port (40) and a discharge port (42); a heat rejection heat exchanger (58) coupled to the discharge port to receive compressed refrigerant; a heat absorption heat exchanger (88); a first lubricant flowpath (120) from the heat rejection heat exchanger to the compressor; a first pump (190) along the first lubricant flow path; a second lubricant flowpath (121) from the heat absorption heat exchanger to the compressor; a second pump (191) along the second lubricant flow path; a first liquid level switch (180) associated with the first pump; a second liquid level switch (181) associated with the second pump; and a controller (900) configured to: responsive to the first liquid level switch indicating low, stop the first pump and restart the second pump; and responsive to the second liquid level switch indicating low, stop the second pump and start the first pump.

Lubrication supply system

Reverse rotation prevention in centrifugal compressor

A method of operating a heat exchanger system in which a compressor, which is drivable by a motor, is fluidly interposed between an evaporator and a condenser following receipt of a shutdown command is provided. The method includes positioning inlet guide vanes (IGVs) of the compressor in a first position in the event of at least one of a first precondition being in effect and the first and a second precondition both not being in effect. The method further includes positioning the IGVs in a second position in an event the first precondition is not in effect but the second precondition is in effect, ramping a speed of the compressor down until a third precondition takes effect, removing power from the motor and positioning the IGVs in the first position once power is removed from the motor.

Surge protection for a multistage compressor

A coolant system includes a multistage compressor having a plurality of surge detection sensors. A condenser is connected to an outlet of the multistage compressor. An economizer is connected to an outlet of the condenser and has a gaseous coolant outlet and a liquid coolant outlet. The liquid coolant outlet is connected to a cooler and the gaseous coolant outlet is connected to a second or later stage of the multistage compressor via a controllable valve. A controller is communicatively coupled to the surge detection sensors and the controllable valve. The controller includes a non-transitory medium storing instructions for causing the controller to detect an occurrence of a surge and restricting a flow through the controllable valve until the surge has ceased.

Sistema de compresión de vapor con compresor lubricado con refrigerante

Un sistema de compresión de vapor (20; 400; 420) que comprende: un compresor (22) que tiene un puerto de aspiración (40) y un puerto de descarga (42), en donde el compresor comprende un motor eléctrico (28) y el motor eléctrico comprende unos cojinetes (36); un intercambiador de calor de rechazo de calor (58) acoplado al puerto de descarga para recibir refrigerante comprimido; un intercambiador de calor de absorción de calor (88); una primera trayectoria de flujo de lubricante (120, 126) que se extiende hasta los cojinetes (36) del motor desde el intercambiador de calor de rechazo de calor; una segunda trayectoria de flujo de lubricante (121, 126) que se extiende hasta los cojinetes (36) del motor desde el intercambiador de calor de absorción de calor; una primera válvula (186) a lo largo de la primera trayectoria de flujo de lubricante; una segunda válvula (187) a lo largo de la segunda trayectoria de flujo de lubricante; una bomba de lubricante (190) compartida por la primera trayectoria de flujo de lubricante y la segunda trayectoria de flujo de lubricante; un sensor (192, 193, 194) colocado para medir al menos una de entre una presión de salida, una vibración y una corriente de motor de la bomba de lubricante; y un controlador (900) configurado para abrir y cerrar selectivamente la primera válvula y la segunda válvula para controlar el flujo de lubricante a lo largo de la primera trayectoria de flujo de lubricante y la segunda trayectoria de flujo de lubricante basándose en una fluctuación detectada en la al menos una de entre una presión de salida, una vibración y una corriente de motor de la bomba de lubricante.

Shell and tube heat exchanger

A heat exchanger is provided and includes a shell extending between opposing tube sheets to define an interior, nozzles coupled to the shell by which a first fluid is communicated with the interior and a tubular body extending between the opposing tube sheets to transmit a second fluid through the interior whereby heat transfer occurs between the first and second fluids along a heat transfer portion of the tubular body defined from respective planes of opposing faces of the opposing tube sheets, the heat transfer portion having at least first and second topologies at first and second sections thereof, respectively, which are respectively disposed proximate to the respective planes of the opposing faces of the opposing tube sheets.