CN112112820B

CN112112820B - Refrigeration cycle system and pump press thereof

Info

Publication number: CN112112820B
Application number: CN201910542512.3A
Authority: CN
Inventors: 沈建芳; 周易; 刘春慧; 刘轩彤; 石刚意
Original assignee: Shanghai Highly Electrical Appliances Co Ltd
Current assignee: Shanghai Highly Electrical Appliances Co Ltd
Priority date: 2019-06-21
Filing date: 2019-06-21
Publication date: 2023-02-28
Anticipated expiration: 2039-06-21
Also published as: CN112112820A

Abstract

The invention discloses a refrigeration cycle system and a pump press thereof, wherein the pump press comprises: a housing; the motor is arranged in the shell; a drive shaft including a main shaft section connected to a rotor of the motor, and first and second ends extending out of both axial sides of the motor; the pump body is hermetically connected to the first end of the driving shaft and adopts a centrifugal impeller structure and is used for compressing gaseous refrigerant and transmitting liquid refrigerant; and first and second bearing assemblies coupled to the first and second ends of the drive shaft, respectively, to cooperatively limit axial movement of the drive shaft and to provide radial support to the drive shaft. The invention can improve the operation stability of the pumping machine and the refrigeration cycle system with the pumping machine.

Description

Refrigeration cycle system and pump press thereof

Technical Field

The invention relates to the field of refrigeration equipment, in particular to a refrigeration cycle system and a pump press thereof.

Background

At present, the refrigeration function of large refrigeration equipment such as an air conditioning unit and the like is mostly realized by compressing refrigerant gas by a traditional compressor to condense and evaporate the refrigerant gas. In summer, the refrigerating equipment can achieve a quick cooling effect through the refrigerating circulation of the compressor, but in winter, the air conditioning unit does not need large refrigerating capacity, namely a large pressure ratio, and if the compressor refrigerating circulation is continuously adopted, the energy waste is serious. Generally, a transmission pump is adopted for refrigeration circulation in winter, a compressor is adopted for refrigeration circulation in summer, and two devices, namely the transmission pump and the compressor, are arranged at the same time, so that the occupied area and the noise are large, and the cost and the maintenance cost are high.

Disclosure of Invention

The present invention is directed to a refrigeration cycle system and a pump press thereof, which are provided to improve stability of the refrigeration cycle system.

In order to solve the technical problem, the invention adopts the following technical scheme:

according to an aspect of the present invention, there is provided a pump press comprising:

a housing;

the motor is arranged in the shell;

a drive shaft including a main shaft section connected to a rotor of the motor, and first and second ends extending out of both axial sides of the motor;

the pump body is hermetically connected to the first end of the driving shaft and adopts a centrifugal impeller structure and is used for compressing gaseous refrigerant and transmitting liquid refrigerant; and

first and second bearing assemblies coupled to the first and second ends of the drive shaft, respectively, to cooperatively limit axial movement of the drive shaft and to provide radial support to the drive shaft.

In one embodiment of the present invention, the first bearing assembly comprises:

the first bearing seat is fixed on the first side of the motor in the axial direction; a first mounting hole is formed in one end, facing the motor, of the first bearing seat, and a second mounting hole which is coaxial with and communicated with the first mounting hole is formed in one end, facing away from the motor, of the first bearing seat; the diameter of the first mounting hole is larger than that of the second mounting hole, and the depth of the second mounting hole is larger than that of the first mounting hole;

a first axial thrust bearing and a first radial bearing respectively fitted in the first mounting hole and the second mounting hole to be fitted over a first end of the drive shaft;

the first axial thrust bearing and the first radial bearing are both aerostatic bearings.

In an embodiment of the present invention, a first radial protrusion is disposed between the main shaft section and the first end of the driving shaft, and an outer diameter of the first radial protrusion is smaller than or equal to an outer diameter of the first axial thrust bearing; the first end of the driving shaft sequentially penetrates through the first axial thrust bearing and the first radial bearing so that the end face of the first radial bulge, which is far away from one side of the motor, can be attached to the first axial thrust bearing.

the first bearing seat is fixed on the first side of the motor in the axial direction; a first mounting hole is formed in one end, facing the motor, of the first bearing seat, and a second mounting hole which is coaxial with and communicated with the first mounting hole is formed in one end, facing away from the motor, of the first bearing seat; the diameter of the first mounting hole is larger than that of the second mounting hole;

the first bearing is assembled in the first mounting hole so as to be sleeved at the first end of the driving shaft; the first bearing is a ceramic bearing.

In an embodiment of the present invention, a first radial protrusion is disposed between the main shaft section and the first end of the driving shaft, and an outer diameter of the first radial protrusion is smaller than or equal to an outer diameter of the first bearing; the first end of the driving shaft sequentially penetrates through the first bearing and the second mounting hole so that the end face of the first radial protrusion, which is far away from one side of the motor, can be attached to the first bearing.

In one embodiment of the present invention, the second bearing assembly includes:

the second bearing seat is fixed on the second side of the motor in the axial direction; a third mounting hole is formed in one end, facing the motor, of the second bearing seat surface, and a fourth mounting hole which is coaxial with and communicated with the third mounting hole is formed in one end, facing away from the motor, of the second bearing seat; the diameter of the third mounting hole is larger than that of the fourth mounting hole, and the depth of the fourth mounting hole is larger than that of the third mounting hole;

a second axial thrust bearing and a second radial bearing respectively fitted in the third mounting hole and the fourth mounting hole to be fitted over the second end of the drive shaft;

the second axial thrust bearing and the second radial bearing are both aerostatic bearings.

In an embodiment of the present invention, a second radial protrusion is disposed between the main shaft section and the second end of the driving shaft, and an outer diameter of the second radial protrusion is smaller than or equal to an outer diameter of the second axial thrust bearing; and the second end of the driving shaft sequentially penetrates through the second axial thrust bearing and the second radial bearing so that the end surface of the second radial bulge, which is far away from one side of the motor, is attached to the second axial thrust bearing.

In one embodiment of the present invention, the second bearing assembly comprises:

the second bearing seat is fixed on the second side of the motor in the axial direction; a third mounting hole is formed in one end, facing the motor, of the second bearing seat, and a fourth mounting hole which is coaxial with and communicated with the third mounting hole is formed in one end, facing away from the motor, of the second bearing seat; the diameter of the third mounting hole is smaller than that of the fourth mounting hole;

the second bearing is assembled in the fourth mounting hole so as to be sleeved at the second end of the driving shaft; the second bearing is a ceramic bearing.

The present invention also provides a refrigeration cycle system including:

the pump press as described above, the pump body has a first fluid outlet and a first fluid inlet, and the side wall of the housing is opened with a second fluid inlet and a second fluid outlet;

a first conduit and a second conduit connected in parallel between the first fluid outlet and the first fluid inlet;

a third conduit and a fourth conduit connected in parallel between the first fluid outlet and the second fluid inlet;

a first end of the fifth pipeline is connected with a second fluid outlet, and a second end of the fifth pipeline is simultaneously connected into the first pipeline, the second pipeline and the fourth pipeline;

the condenser is arranged on the first pipeline and the second pipeline;

the evaporator is arranged on the second pipeline and the fourth pipeline;

the electromagnetic valves are respectively arranged on the first pipeline, the second pipeline, the third pipeline and the fourth pipeline;

and the air bearing control unit is arranged on the third pipeline and the fourth pipeline.

In an embodiment of the present invention, the refrigeration cycle further includes a throttle valve disposed in the first pipeline and between the evaporator and the condenser.

The present invention also provides another refrigeration cycle system including:

a third pipeline, a first end of the third pipeline being connected to the second fluid inlet, a second end of the third pipeline being connected to the first pipeline and the second pipeline simultaneously;

a first end of the fourth pipeline is connected with a second fluid outlet, and a second end of the fourth pipeline is simultaneously connected into the first pipeline and the second pipeline;

the condenser is arranged on the first pipeline and the second pipeline;

the evaporator is arranged on the second pipeline and the second pipeline;

and the electromagnetic valves are at least arranged on the first pipeline and the second pipeline.

The pump press integrates the compressor and the transmission pump into a whole, realizes the system superiority of high-temperature refrigeration and ensures the energy conservation of the system during low-temperature refrigeration, and simultaneously can reduce the production cost and reduce the occupation of an air conditioner unit on the site. In the pump press, the first bearing assembly and the second bearing assembly are respectively connected to the first end and the second end of the driving shaft so as to jointly limit the axial movement of the driving shaft and provide radial support for the driving shaft, thereby improving the operation stability of the pump press and a refrigeration cycle system with the pump press.

Drawings

Other features, objects and advantages of the present invention will become more apparent upon reading of the detailed description of non-limiting embodiments thereof, with reference to the following drawings.

Fig. 1 is a schematic view of a pump press according to a first embodiment of the present invention.

Fig. 2 is a schematic structural view of a pump press in a second embodiment of the present invention.

Fig. 3 is a schematic view of a refrigeration cycle system including the pump press shown in fig. 1.

Fig. 4 is a schematic view of a refrigeration cycle system including the pump press shown in fig. 2.

Reference numerals

1a Pump body

3. First fluid inlet

5. First fluid outlet

7. First axial thrust bearing

71. First bearing

81. Second bearing

8. First radial bearing

9. Shell body

91. Sealing element

10. Rotor

11. Drive shaft

12. First impeller

14. First bearing seat

15. Second bearing seat

16. Second axial thrust bearing

17. Second radial bearing

18. Second radial projection

19. A first radial projection

21. First pipeline

22. The second pipeline

23. Third pipeline

24. Fourth pipeline

25. Fifth pipeline

28. Evaporator and evaporator assembly

29. Condenser

30. Air bearing control unit

31. First check valve

34. Electromagnetic valve

35. Throttle valve

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their repetitive description will be omitted.

Fig. 1 is a schematic structural view of a pump press according to a first embodiment of the present invention. Fig. 4 is a schematic structural view of a pump press in a second embodiment of the present invention. Fig. 3 is a schematic view of a refrigeration cycle system including the pump press shown in fig. 1. Fig. 4 is a schematic view of a refrigeration cycle system including the pump press shown in fig. 2.

Example 1

The present invention provides a pump press, as shown in fig. 1, the pump press 103 includes: the pump comprises a housing 9, a motor, a drive shaft 11, a pump body 1a, a first bearing assembly and a second bearing assembly. The motor is arranged in the housing 9. The drive shaft 11 includes a main shaft section connected to the rotor 10 of the motor, and first and second ends protruding from both axial sides of the motor. The pump body 1a is hermetically connected to a first end of the driving shaft 11, and the pump body 1a adopts a centrifugal impeller structure for compressing a gaseous refrigerant and transferring a liquid refrigerant. The first and second bearing assemblies are coupled to first and second ends of the drive shaft 11, respectively, to cooperatively limit axial movement of the drive shaft 11 and to provide radial support to the drive shaft 11. The first bearing assembly includes: a first bearing seat 14, a first axial thrust bearing 7 and a first radial bearing 8. The first bearing seat 14 is fixed to a first side of the motor in the axial direction. One end of the first bearing seat 14 facing the motor is provided with a first mounting hole, and one end of the first bearing seat 14 deviating from the motor is provided with a second mounting hole coaxial and communicated with the first mounting hole. The diameter of the first mounting hole is larger than that of the second mounting hole, and the depth of the second mounting hole is larger than that of the first mounting hole. The first axial thrust bearing 7 and the first radial bearing 8 are fitted in the first mounting hole and the second mounting hole, respectively, to be fitted over the first end of the driving shaft 11. The first axial thrust bearing 7 and the first radial bearing 8 are both aerostatic bearings. Further, a first radial protrusion 19 is arranged between the main shaft section and the first end of the driving shaft 11, and the outer diameter of the first radial protrusion 19 is smaller than or equal to the outer diameter of the first axial thrust bearing 7. The first end of the driving shaft 11 passes through the first axial thrust bearing 7 and the first radial bearing 8 in sequence so that the end surface of the first radial protrusion 19 facing away from the motor side can be attached to the first axial thrust bearing 7. The second bearing assembly includes: a second bearing block 15, a second axial thrust bearing 16 and a second radial bearing 17. The second bearing seat 15 is fixed to a second side of the motor in the axial direction. A third mounting hole is formed in one end, facing the motor, of the second bearing seat 15, and a fourth mounting hole which is coaxial with and communicated with the third mounting hole is formed in one end, facing away from the motor, of the second bearing seat 15. The diameter of the third mounting hole is larger than that of the fourth mounting hole, and the depth of the fourth mounting hole is larger than that of the third mounting hole. The second axial bearing 16 and the second radial bearing 17 are respectively fitted in the third mounting hole and the fourth mounting hole to be fitted over the second end of the drive shaft 11. The second axial thrust bearing 16 and the second radial bearing 17 are both aerostatic bearings. Further, a second radial protrusion 18 is disposed between the main shaft section and the second end of the driving shaft 11, and an outer diameter of the second radial protrusion 18 is smaller than or equal to an outer diameter of the second axial thrust bearing 16. The second end of the driving shaft 11 passes through the second axial thrust bearing 16 and the second radial bearing 17 in sequence so that the end surface of the second radial protrusion 18 facing away from the motor side can be attached to the second axial thrust bearing 16.

Alternatively, the pump body 1a may be a single-stage pump or a multistage pump. The single-stage pump, i.e. the single-stage centrifugal pump, is a pump with only one impeller, and the maximum lift of a common single-stage pump is only 125 meters, and has the advantages of simple structure, stable performance, high rotating speed, small volume, light weight, high efficiency, large flow, easy operation and maintenance, and the like. The multistage pump is a centrifugal pump combining a water inlet section, a water outlet section and a middle section through a pull rod, the output water pressure of the centrifugal pump can be very high, materials are transmitted by centrifugal force obtained by rotation of an impeller, and when the gas density reaches the working range of the mechanical vacuum pump, the materials are pumped out, so that high vacuum is gradually obtained. The multistage pump is a centrifugal pump which can change the volume because the volume of a pump cavity is changed to realize suction, compression and exhaust.

Alternatively, the pump body 1a may be sealingly connected to the first end of the driving shaft 11 through a sealing member 91, and the sealing member 91 may be a rubber pad or the like.

In this embodiment, the pump body adopts a centrifugal impeller structure, and can be used for compressing a gaseous refrigerant and transmitting a liquid refrigerant. The pump press integrates the compressor and the transmission pump into a whole, realizes the system superiority of high-temperature refrigeration and ensures the system energy conservation during low-temperature refrigeration, and simultaneously can reduce the production cost and reduce the occupation of the air conditioning unit on the site. In the pump press, the first bearing assembly and the second bearing assembly are respectively connected to the first end and the second end of the driving shaft so as to jointly limit the axial movement of the driving shaft and provide radial support for the driving shaft, thereby improving the operation stability of the pump press and a refrigeration cycle system with the pump press.

Accordingly, the present embodiment also provides a refrigeration cycle system, as shown in fig. 1 and 3, which includes the pump 103, the first pipeline 21, the second pipeline 22, the third pipeline 23, the fourth pipeline 24 and the fifth pipeline 25, as described above, as well as at least one condenser 29, at least one evaporator 28, a plurality of solenoid valves 34 and an air bearing control unit 30. The pump body 1a has a first fluid outlet 5 and a first fluid inlet 3, and a second fluid inlet and a second fluid outlet are opened on the side wall of the housing 9. The first and

second conduits

21, 22 are connected in parallel between the first fluid outlet 5 and the first fluid inlet 3. The third and

fourth lines

23, 24 are connected in parallel between the first and

second fluid outlets

5, 24. A first end of the fifth pipeline 25 is connected to a second fluid outlet, and a second end of the fifth pipeline 25 is connected to the first pipeline 21, the second pipeline 22 and the fourth pipeline 24. The condenser 29 is provided in the first pipe line 21 and the second pipe line 22. The evaporator 28 is disposed in the second pipeline 22 and the fourth pipeline 24. The plurality of solenoid valves 34 are respectively provided in the first pipeline 21, the second pipeline 22, the third pipeline 23, and the fourth pipeline 24. The air bearing control unit 30 is disposed in the third pipeline 23 and the fourth pipeline 24.

Further, the refrigeration cycle system further includes a throttle valve 35, and the throttle valve 35 is disposed in the first pipeline 21 and between the evaporator 28 and the condenser 29.

Optionally, the refrigeration cycle further includes a first check valve 31, where the first check valve 31 is disposed in the fifth pipeline 25, and is used to prevent the refrigerant in the fifth pipeline 25 from flowing backwards. Of course, the first, second, third and

fourth pipelines

21, 22, 23 and 24 may also be provided with a check valve to prevent the refrigerant therein from flowing backwards.

The principle of the refrigeration cycle system of the present embodiment is as follows:

when the pump body 1a is used as a gas compression mechanism to compress a gaseous refrigerant, the second line 22 and the fourth line 24 are interrupted by the solenoid valve 34, and the refrigerant flows out from the first fluid outlet 5, and flows back to the pump body 1a through the first line via the condenser 29, the evaporator 28, and the first fluid inlet 3 in this order. Part of the refrigerant flows through the air bearing control unit 30 through the third pipeline 23, the refrigerant is heated by the air bearing control unit 30 to be vaporized and pressurized, then enters the housing 9 through the second fluid inlet to provide a constant-pressure air source for the bearing, cools the rotor 10 of the motor, then flows out of the second fluid outlet, and finally flows into the first pipeline 21 through the fifth pipeline 25, and then enters the pump body 1a through the evaporator 28.

When the pump body 1a is used as a liquid transfer mechanism to transfer liquid refrigerant, the first pipeline 21 and the third pipeline 23 are controlled to be interrupted by the electromagnetic valve 34, and the second pipeline 22, the fourth pipeline 24 and the fifth pipeline 25 are conducted. The liquid refrigerant enters the evaporator 28 and the condenser 29 in sequence from the second pipeline 22, and then flows back to the pump body 1a. Part of the liquid refrigerant sequentially enters the evaporator 28 and the air bearing control unit 30 from the fourth pipeline 24 to pass through, the air bearing control unit 30 heats the refrigerant to vaporize and pressurize the refrigerant, then enters the housing 9 through the second fluid inlet to provide a constant pressure air source for the bearing, cools the rotor 10 of the motor, then flows out of the second fluid outlet, and then joins the second pipeline 22 and the fourth pipeline 24 through the fifth pipeline 25, enters the pump body 1a through the condenser 29, and enters the housing 9 through the air bearing control unit 30.

The pump press integrates the compressor and the transmission pump into a whole, realizes the system superiority of high-temperature refrigeration and ensures the system energy conservation during low-temperature refrigeration, and simultaneously can reduce the production cost and reduce the occupation of the air conditioning unit on the site. In the pumping press, the first bearing assembly and the second bearing assembly are respectively connected to the first end and the second end of the driving shaft 11 to jointly limit the axial movement of the driving shaft 11 and provide radial support to the driving shaft 11, so that the operation stability of the pumping press and the refrigeration cycle system with the pumping press can be improved.

Example 2

As shown in fig. 2, the pump press 104 in the present embodiment is different from that in embodiment 1 mainly in that:

the first bearing assembly includes: a first bearing seat 14 and a first bearing 71. The first bearing seat 14 is fixed to a first side of the motor in the axial direction. One end of the first bearing seat 14 facing the motor is provided with a first mounting hole, and one end of the first bearing seat 14 deviating from the motor is provided with a second mounting hole coaxial and communicated with the first mounting hole. The diameter of the first mounting hole is larger than that of the second mounting hole. The first bearing 71 is mounted in the first mounting hole to be sleeved on the first end of the driving shaft 11. The first bearing 71 is a ceramic bearing. Further, a first radial protrusion 19 is disposed between the main shaft section and the first end of the driving shaft 11, and an outer diameter of the first radial protrusion 19 is smaller than or equal to an outer diameter of the first bearing 71. The first end of the driving shaft 11 sequentially passes through the first bearing 71 and the second mounting hole so that the end surface of the first radial protrusion 19 facing away from the motor is attached to the first bearing 71.

The second bearing assembly includes: a second bearing housing 15 and a second bearing 81. The second bearing seat 15 is fixed to a second axial side of the motor. A third mounting hole is formed in one end, facing the motor, of the second bearing block 15, and a fourth mounting hole which is coaxial with and communicated with the third mounting hole is formed in one end, facing away from the motor, of the second bearing block 15. The diameter of the third mounting hole is smaller than that of the fourth mounting hole, so that the second bearing 81 is assembled in the fourth mounting hole to be sleeved on the second end of the driving shaft 11. The second bearing 81 is a ceramic bearing.

The pump press integrates the compressor and the transmission pump into a whole, realizes the system superiority of high-temperature refrigeration and ensures the system energy conservation during low-temperature refrigeration, and simultaneously can reduce the production cost and reduce the occupation of the air conditioning unit on the site. In the pump press, the first bearing assembly and the second bearing assembly are respectively connected to the first end and the second end of the driving shaft so as to jointly limit the axial movement of the driving shaft and provide radial support for the driving shaft, thereby improving the operation stability of the pump press and a refrigeration cycle system with the pump press.

Accordingly, this embodiment further provides a refrigeration cycle system, as shown in fig. 2 and 4, the refrigeration cycle system includes the pump press 104, the first pipeline 21, the second pipeline 22, the third pipeline 23 and the fourth pipeline 24, the at least one condenser 29, the at least one evaporator 28 and the plurality of solenoid valves 34, the pump body 1a has the first fluid outlet 5 and the first fluid inlet 3, and the side wall of the housing 9 has the second fluid inlet and the second fluid outlet. The first and

second conduits

21, 22 are connected in parallel between the first fluid outlet 5 and the first fluid inlet 3. A first end of the third pipeline 23 is connected to the second fluid inlet, and a second end of the third pipeline 23 is connected to the first pipeline 21 and the second pipeline 22 simultaneously. A first end of the fourth pipeline 24 is connected to the second fluid outlet, and a second end of the fourth pipeline 24 is connected to the first pipeline 21 and the second pipeline 22 simultaneously. The condenser 29 is provided in the first pipe line 21 and the second pipe line 22. The evaporator 28 is disposed in the second pipeline 22 and the second pipeline 22. The electromagnetic valve 34 is provided at least in the first pipe line 21 and the second pipe line 22.

Optionally, the refrigeration cycle further includes a first check valve 31, and the first check valve 31 is disposed in the fourth pipeline 24 and is used for preventing the refrigerant in the fourth pipeline 24 from flowing backwards. Of course, the first, second and

third pipelines

21, 22 and 23 may also be provided with a check valve to prevent the refrigerant therein from flowing backwards.

The operation principle and effect of the refrigeration cycle system of this embodiment are similar to those of the refrigeration cycle system of embodiment 1, and are not described here again.

The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.

Claims

1. A refrigeration cycle system, comprising:

a pump press, the pump press comprising: a housing; the motor is arranged in the shell; a drive shaft including a main shaft section connected to a rotor of the motor, and first and second ends extending out of both axial sides of the motor; a pump body hermetically connected to the first end of the driving shaft, the pump body adopting a centrifugal impeller structure for compressing a gaseous refrigerant and transmitting a liquid refrigerant; and first and second bearing assemblies coupled to the first and second ends of the drive shaft, respectively, to cooperatively limit axial movement of the drive shaft and to provide radial support to the drive shaft;

the first bearing assembly includes:

the first axial thrust bearing and the first radial bearing are both air hydrostatic bearings; the pump body is provided with a first fluid outlet and a first fluid inlet, and the side wall of the shell is provided with a second fluid inlet and a second fluid outlet;

a third and fourth conduit connected in parallel between the first and second fluid outlets;

a fifth pipeline, a first end of the fifth pipeline being connected to a second fluid outlet, a second end of the fifth pipeline being connected to the first pipeline, the second pipeline, and the fourth pipeline simultaneously;

the condenser is arranged on the first pipeline and the second pipeline;

the evaporator is arranged on the second pipeline and the fourth pipeline;

2. The refrigeration cycle system of claim 1, wherein a first radial projection is disposed between the main shaft segment and the first end of the drive shaft, the first radial projection having an outer diameter equal to or less than an outer diameter of the first axial thrust bearing; the first end of the driving shaft sequentially penetrates through the first axial thrust bearing and the first radial bearing so that the end face of the first radial bulge, which is far away from one side of the motor, can be attached to the first axial thrust bearing.

3. The refrigeration cycle system of claim 1 or 2, further comprising a throttle valve disposed in the first pipeline between the first end of the evaporator and the first end of the condenser, wherein the first end of the evaporator is connected to the second end of the first pipeline, the second end of the second pipeline, and the first end of the fourth pipeline, and the first end of the condenser is connected to the first end of the first pipeline and the first end of the second pipeline, respectively.

4. A refrigeration cycle system, comprising:

a pump press, the pump press comprising: a housing; the motor is arranged in the shell; a drive shaft including a main shaft section connected to a rotor of the motor, and first and second ends extending out of both axial sides of the motor; the pump body is hermetically connected to the first end of the driving shaft and adopts a centrifugal impeller structure and is used for compressing gaseous refrigerant and transmitting liquid refrigerant; and first and second bearing assemblies coupled to the first and second ends of the drive shaft, respectively, to cooperatively limit axial movement of the drive shaft and to provide radial support to the drive shaft;

the second bearing assembly includes:

the second bearing seat is fixed on the second side of the motor in the axial direction; a third mounting hole is formed in one end, facing the motor, of the second bearing seat, and a fourth mounting hole which is coaxial with and communicated with the third mounting hole is formed in one end, facing away from the motor, of the second bearing seat; the diameter of the third mounting hole is larger than that of the fourth mounting hole, and the depth of the fourth mounting hole is larger than that of the third mounting hole;

a second axial thrust bearing and a second radial bearing respectively fitted in the third mounting hole and the fourth mounting hole to be fitted over a second end of the drive shaft;

the second axial thrust bearing and the second radial bearing are both air hydrostatic bearings;

the pump body is provided with a first fluid outlet and a first fluid inlet, and the side wall of the shell is provided with a second fluid inlet and a second fluid outlet;

a first and second conduit connected in parallel between the first fluid outlet and the first fluid inlet;

third and fourth conduits connected in parallel between the first and second fluid outlets;

the condenser is arranged on the first pipeline and the second pipeline;

the evaporator is arranged on the second pipeline and the fourth pipeline;

5. The refrigeration cycle system of claim 4, wherein a second radial protrusion is disposed between the main shaft segment and the second end of the drive shaft, the second radial protrusion having an outer diameter less than or equal to an outer diameter of the second axial thrust bearing; and the second end of the driving shaft sequentially penetrates through the second axial thrust bearing and the second radial bearing so that the end surface of the second radial bulge, which is far away from one side of the motor, is attached to the second axial thrust bearing.

6. The refrigeration cycle system of claim 4 or 5, further comprising a throttle valve disposed in the first pipeline between the first end of the evaporator and the first end of the condenser, wherein the first end of the evaporator is connected to the second end of the first pipeline, the second end of the second pipeline, and the first end of the fourth pipeline, and the first end of the condenser is connected to the first end of the first pipeline and the first end of the second pipeline, respectively.

7. A refrigeration cycle system, comprising:

the first bearing assembly includes:

the first bearing is assembled in the first mounting hole so as to be sleeved at the first end of the driving shaft; the first bearing is a ceramic bearing;

a first end of the fourth pipeline is connected with a second fluid outlet, and a second end of the fourth pipeline is connected into the first pipeline and the second pipeline simultaneously;

the condenser is arranged on the first pipeline and the second pipeline;

the evaporator is arranged on the first pipeline and the second pipeline; and the electromagnetic valves are at least arranged on the first pipeline and the second pipeline.

8. The refrigeration cycle system of claim 7, wherein a first radial projection is disposed between the driveshaft section and the first end of the driveshaft, the first radial projection having an outer diameter that is less than or equal to an outer diameter of the first bearing; the first end of the driving shaft sequentially penetrates through the first bearing and the second mounting hole so that the end face of the first radial protrusion, which is deviated from one side of the motor, can be attached to the first bearing.

9. The refrigeration cycle system of claim 7 or 8, further comprising a throttle valve disposed in the first pipeline between the first end of the evaporator and the first end of the condenser, wherein the first end of the condenser is connected to the second end of the first pipeline and the second end of the second pipeline, and the first end of the evaporator is connected to the first end of the first pipeline and the first end of the second pipeline.

10. A refrigeration cycle system, comprising:

pump press, pump press includes: a housing; the motor is arranged in the shell; a drive shaft including a main shaft section connected to a rotor of the motor, and first and second ends extending out of both axial sides of the motor; a pump body hermetically connected to the first end of the driving shaft, the pump body adopting a centrifugal impeller structure for compressing a gaseous refrigerant and transmitting a liquid refrigerant; and first and second bearing assemblies coupled to the first and second ends of the drive shaft, respectively, to cooperatively limit axial movement of the drive shaft and to provide radial support to the drive shaft;

the second bearing assembly includes:

the second bearing seat is fixed on the second side of the motor in the axial direction; a third mounting hole is formed in one end, facing the motor, of the second bearing seat surface, and a fourth mounting hole which is coaxial with and communicated with the third mounting hole is formed in one end, facing away from the motor, of the second bearing seat; the diameter of the third mounting hole is smaller than that of the fourth mounting hole;

the second bearing is assembled in the fourth mounting hole so as to be sleeved at the second end of the driving shaft; the second bearing is a ceramic bearing;

the condenser is arranged on the first pipeline and the second pipeline;

the evaporator is arranged on the first pipeline and the second pipeline;

11. The refrigeration cycle system of claim 10, further comprising a throttle valve disposed in the first conduit between the first end of the evaporator and the first end of the condenser, the first end of the condenser being connected to the second end of the first conduit and the second end of the second conduit, respectively, and the first end of the evaporator being connected to the first end of the first conduit and the first end of the second conduit, respectively.