CN214577884U

CN214577884U - Refrigeration system of centrifugal compressor of gas bearing

Info

Publication number: CN214577884U
Application number: CN202120116028.7U
Authority: CN
Inventors: 商萍君; 单正娅; 芮长颖; 任重威; 庞军
Original assignee: Wuxi Institute of Technology
Current assignee: Qingdao Hisense Hitachi Air Conditioning System Co Ltd
Priority date: 2021-01-17
Filing date: 2021-01-17
Publication date: 2021-11-02
Anticipated expiration: 2031-01-17

Abstract

The utility model discloses a centrifugal compressor's of gas bearing refrigerating system, including footstep bearing, the footstep bearing goes up one side fixed connection thrust collar, and footstep bearing passes the reverse footstep bearing of thrust collar one side fixed connection, and the gaseous journal bearing of footstep bearing one side fixed connection non-impeller end is kept away from to reverse footstep bearing, and the gaseous journal bearing of non-impeller end keeps away from footstep bearing one side fixed connection non-impeller end landing bearing, and non-impeller end landing bearing keeps away from footstep bearing one side fixed connection electric motor rotor axle subassembly, the utility model discloses the beneficial effect who reaches is: realize quintuple gas-liquid separation design through structural design in the auxiliary evaporator and guaranteed further gas-liquid separation effect, eliminate tiny refrigerant liquid in guaranteeing gas bearing's the air feed completely, stagger through the pore group angle of gas-liquid separation filter screen subassembly, one-level perforated plate liquid separation device, second grade perforated plate liquid separation device, one-level and second grade, increase baffling and divide the liquid effect.

Description

Refrigeration system of centrifugal compressor of gas bearing

Technical Field

The utility model relates to a refrigerating system, in particular to centrifugal compressor's of gas bearing refrigerating system belongs to mechanical technical field.

Background

The existing technology is a semi-closed centrifugal compressor adopting a rolling bearing, a sliding bearing or a magnetic suspension bearing, the technical development trend requires oil-free lubrication, maintenance of a lubrication oil circuit system, oil circuit management, oil return management and maintenance of the oil circuit system are eliminated, the oil-free lubrication also represents higher operation efficiency of the compressor and the refrigeration system, lower vibration, noise and operation stability are achieved, and customer experience is better.

The centrifugal compressor adopting the air bearing can provide bearing air supply with required pressure by high-pressure exhaust of a refrigerating system when the refrigerating system operates; during start-up and shut-down, special designs are required to ensure stable bearing air supply to ensure that mechanical contact and wear do not occur; in particular, in case of sudden power failure, the air supply pressure difference of the air bearing is insufficient due to the sudden cut-off of the air supply power of the bearing, and the motor operating at high speed directly falls on the landing bearing or the support spring to cause the damage of the components such as the air bearing, so that a special design is required to ensure the safe landing of the air bearing compressor under the condition of sudden power failure.

SUMMERY OF THE UTILITY MODEL

The utility model provides a gas bearing's centrifugal compressor's refrigerating system, the effectual problem that exists of having solved among the prior art.

In order to solve the technical problem, the utility model provides a following technical scheme:

the utility model relates to a gas bearing's centrifugal compressor's refrigerating system, including footstep bearing, the last one side fixed connection thrust lantern ring of footstep bearing, footstep bearing passes thrust lantern ring one side fixed connection reverse footstep bearing, reverse footstep bearing keeps away from footstep bearing one side fixed connection non-impeller end gas journal bearing, non-impeller end gas journal bearing keeps away from footstep bearing one side fixed connection non-impeller end landing bearing, non-impeller end landing bearing keeps away from footstep bearing one side fixed connection motor rotor shaft subassembly, motor rotor shaft subassembly keeps away from footstep bearing one side fixed connection motor stator, motor stator keeps away from footstep bearing one side fixed connection impeller end landing bearing, impeller end landing bearing keeps away from footstep bearing one side fixed connection impeller end gas journal bearing, impeller end gas journal bearing keeps away from footstep bearing one side fixed connection impeller, the centrifugal compressor volute is fixedly connected to the outer side of the impeller, the variable diffuser mechanism is fixedly connected in the centrifugal compressor volute, the upper ends of the thrust bearing, the reverse thrust bearing, the non-impeller-end gas radial bearing, the impeller-end landing bearing and the non-impeller-end landing bearing are fixedly connected with a gas supply distribution main pipeline of the gas bearing, the high-pressure nozzle gas supply pore pipelines of the gas bearing are fixedly connected on the thrust bearing, the reverse thrust bearing, the non-impeller-end gas radial bearing, the impeller-end landing bearing and the non-impeller-end landing bearing, the upper end of the gas supply distribution main pipeline of the gas bearing is fixedly connected with a gas supply pressure sensor, the gas supply pressure sensor is fixedly connected with an auxiliary evaporator gas outlet pipe orifice through the gas floating bearing gas supply main pipeline, and the lower end of the auxiliary evaporator gas outlet pipe orifice is fixedly connected with an auxiliary evaporator, the air-float bearing air supply main pipeline is fixedly connected with a second stop valve, a first stop valve and a gas filter, the motor stator is fixedly connected with a motor cooling liquid supply pipeline through a motor cooling liquid supply electronic expansion valve, the motor cooling liquid supply pipeline is far away from one side of the motor stator and is fixedly connected with a condenser outlet liquid phase pipeline, one side of the condenser outlet liquid phase pipeline is fixedly connected with a condenser through a liquid path electromagnetic valve, the lower end of the volute of the centrifugal compressor is fixedly connected with an air supply and liquid return pipeline of the motor cooling bearing through a bearing air return pressure sensor, the air supply and liquid return pipeline of the motor cooling bearing is far away from one side of the volute of the centrifugal compressor and is fixedly connected with an evaporator, one side of the volute of the centrifugal compressor is fixedly connected with an air exhaust pipeline of the compressor and an air exhaust bearing air supply main pipeline through an exhaust check valve, and the air exhaust pipeline of the compressor is far away from one side of the volute of the centrifugal compressor and is fixedly connected with the condenser, the compressor exhaust bearing air supply main pipeline is far away from one side of a centrifugal compressor volute through a compressor exhaust bearing air supply loop one-way valve fixed connection compressor exhaust bearing air supply pipeline one and a compressor exhaust bearing air supply main pipeline two, the compressor exhaust bearing air supply main pipeline two is far away from one side of the compressor exhaust bearing air supply main pipeline through a compressor exhaust bearing air supply solenoid valve fixed connection air floatation bearing air supply main pipeline, one side of the compressor exhaust bearing air supply pipeline one is fixedly connected with a heating coil air inlet, the centrifugal compressor volute output end fixed connection compressor air suction pipeline, the compressor air suction pipeline is far away from one side of the centrifugal compressor volute fixed connection evaporator.

As an optimal technical scheme of the utility model, the refrigerant liquid pump pipeline of evaporimeter confession liquid electronic expansion valve fixed connection condenser liquid phase export is passed through to evaporimeter upper end one side, evaporimeter one end fixed connection liquid pump is kept away from to the refrigerant liquid pump pipeline of condenser liquid phase export, the liquid pump is kept away from evaporimeter one end and is passed through behind the pump liquid way check valve fixed connection refrigerant liquid pump export confession liquid pipeline, liquid pump one side fixed connection pump liquid way feed liquid mouth of pipe is kept away from to refrigerant liquid pump export confession liquid pipeline, evaporimeter upper end fixed connection evaporimeter pressure sensor.

As an optimal technical scheme of the utility model, including one-level perforated plate liquid separation equipment, second grade perforated plate liquid separation equipment, gas-liquid separation filter screen subassembly, compressor exhaust heating coil, fender liquid board and auxiliary heating coil in the auxiliary evaporator, auxiliary evaporator one side fixed connection auxiliary evaporator level sensor, one-level perforated plate liquid separation equipment is located second grade perforated plate liquid separation equipment upper end, gas-liquid separation filter screen subassembly is located second grade perforated plate liquid separation equipment lower extreme, compressor exhaust heating coil is located gas-liquid separation filter screen subassembly lower extreme, auxiliary heating coil is located compressor exhaust heating coil lower extreme, auxiliary evaporator upper end one side fixed connection auxiliary evaporator pressure sensor, fender liquid board one side fixed connection pump liquid way feed liquor mouth of pipe.

As a preferred technical scheme of the utility model, the compressor return-air liquid return pipeline of the supplementary evaporimeter of liquid check valve fixed connection is returned through returning air to the condenser lower extreme, the compressor return-air liquid return pipeline of supplementary evaporimeter keeps away from condenser one side fixed connection heating coil pipe mouth of pipe, condenser one side fixed connection supplementary evaporimeter is kept away from to heating coil pipe mouth of pipe, condenser upper end fixed connection condensation pressure sensor.

The utility model discloses the beneficial effect who reaches is: the design of quintuple gas-liquid separation is realized through the structural design in the auxiliary evaporator, the further gas-liquid separation effect is ensured, the tiny refrigerant liquid is completely eliminated in the gas supply of the gas bearing, the angles of the first-stage porous plate liquid separation filter screen component, the first-stage porous plate liquid separation device, the second-stage porous plate liquid separation device and the first-stage and second-stage hole groups are staggered, the baffling and liquid separating effects are improved, the eccentric design of the total gas outlet pipe mouth is beneficial to the rotation of the airflow in the shell, the flow stroke is improved, and the gas-liquid separation effect is improved, the gas filter and the front and the rear first stop valves and the second stop valves are added on the gas supply loop of the gas bearing, the gas filter is helpful to eliminate micro particles in the gas, because of impurities in the pipelines and the pressure vessel, the impurities are brought into the bearing along with the high-speed air flow, and the operation stability of the gas bearing is better ensured.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a flow diagram I of the refrigeration system of the present invention;

FIG. 2 is a flow diagram II of the refrigeration system of the present invention;

FIG. 3 is a flow diagram III of the refrigeration system of the present invention;

FIG. 4 is a schematic structural view of a gas-liquid separation screen assembly of the present invention;

FIG. 5 is a schematic structural view of a gas-liquid separation screen assembly mesh of the present invention;

FIG. 6 is a schematic diagram of the configuration of the first stage perforated plate liquid separation apparatus of the present invention;

FIG. 7 is a schematic diagram of the structure of a two-stage porous plate liquid separation apparatus of the present invention.

In the figure: 1. a thrust bearing; 2. a thrust collar; 3. a reverse thrust bearing; 4. a non-impeller-end gas radial bearing; 5. a motor rotor shaft assembly; 6. a motor stator; 7. an impeller-end gas radial bearing; 8. an impeller tip landing bearing; 9. a non-impeller-end landing bearing; 10. an impeller; 11. a centrifugal compressor volute; 12. a variable diffuser mechanism; 13. a condenser; 14. an evaporator; 15. a liquid pump; 16. A post-pump fluid path check valve; 17. the compressor exhaust bearing air supply loop one-way valve; 18. a gas return and liquid return one-way valve; 19. the evaporator supplies liquid to the electronic expansion valve; 20. an air supply electromagnetic valve of the compressor exhaust bearing; 21. an auxiliary evaporator; 22. an auxiliary evaporator liquid level sensor; 23. a compressor exhaust heating coil; 24. an auxiliary heating coil; 25. a liquid baffle; 26. a gas-liquid separation screen assembly; 27. a first stage perforated plate liquid separation device; 28. a second stage perforated plate liquid separation device; 29. a liquid inlet pipe orifice of the pump liquid path; 30. an auxiliary evaporator air outlet pipe orifice; 31. a heating coil air inlet; 32. a heating coil air outlet pipe mouth; 33. a first shut-off valve; 34. a gas filter; 35. a second stop valve; 36. the electric motor cools the liquid supply electronic expansion valve; 37. an exhaust check valve; 38. a liquid path solenoid valve; 100. a gas supply distribution main pipeline of the gas bearing; 101. A high-pressure nozzle gas supply hole pipeline of the gas bearing; 102. a compressor discharge line; 103. a condenser outlet liquid phase pipeline; 104. a compressor suction line; 105. a refrigerant liquid pump line at the liquid phase outlet of the condenser; 106. a compressor exhaust bearing air supply main pipeline; 107. a compressor exhaust bearing air supply pipeline I; 108. a compressor exhaust bearing air supply main pipeline II; 109. a main air supply pipeline of the air bearing; 110. a refrigerant liquid pump outlet liquid supply pipeline; 111. a compressor return air and liquid pipeline of the auxiliary evaporator; 112. a gas supply and liquid return pipeline for cooling the bearing of the motor; 113. a motor cooling liquid supply pipeline; 200. a condensing pressure sensor; 201. evaporative pressure sensing; 202. an auxiliary evaporator pressure sensor; 203. an air supply pressure sensor; 204. and a bearing return air pressure sensor.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Example 1: as shown in figure 1, the utility model relates to a refrigeration system of centrifugal compressor of gas bearing, which comprises a thrust bearing 1, a thrust collar 2 is fixedly connected on one side of the thrust bearing 1, the thrust bearing 1 passes through one side of the thrust collar 2 and is fixedly connected with a reverse thrust bearing 3, one side of the reverse thrust bearing 3 far away from the thrust bearing 1 is fixedly connected with a non-impeller-end gas radial bearing 4, one side of the non-impeller-end gas radial bearing 4 far away from the thrust bearing 1 is fixedly connected with a non-impeller-end landing bearing 9, one side of the non-impeller-end landing bearing 9 far away from the thrust bearing 1 is fixedly connected with a motor rotor shaft assembly 5, one side of the motor rotor shaft assembly 5 far away from the thrust bearing 1 is fixedly connected with a motor stator 6, one side of the motor stator 6 far away from the thrust bearing 1 is fixedly connected with an impeller-end landing bearing 8, one side of the impeller-end landing bearing 8 far away from the thrust bearing 1 is fixedly connected with an impeller-end gas radial bearing 7, the side of the impeller end gas radial bearing 7 far away from the thrust bearing 1 is fixedly connected with an impeller 10, the outer side of the impeller 10 is fixedly connected with a centrifugal compressor volute 11, the inner part of the centrifugal compressor volute 11 is fixedly connected with a variable diffuser mechanism 12, the upper ends of the thrust bearing 1, a reverse thrust bearing 3, a non-impeller end gas radial bearing 4, the impeller end gas radial bearing 7, an impeller end landing bearing 8 and a non-impeller end landing bearing 9 are fixedly connected with a gas supply distribution main pipeline 100 of the gas bearing, the upper ends of the thrust bearing 1, the reverse thrust bearing 3, the non-impeller end gas radial bearing 4, the impeller end gas radial bearing 7, the impeller end landing bearing 8 and the non-impeller end landing bearing 9 are fixedly connected with a high-pressure nozzle gas supply hole pipeline 101 of the gas bearing, the upper end of the gas supply distribution main pipeline 100 of the gas bearing is fixedly connected with a gas supply pressure sensor 203, the gas supply pressure sensor 203 is fixedly connected with an auxiliary evaporator gas outlet pipe orifice 30 through a gas supply main pipeline 109 of the gas bearing, the lower end of an auxiliary evaporator air outlet pipe orifice 30 is fixedly connected with an auxiliary evaporator 21, a main air supply pipeline 109 of an air bearing is fixedly connected with a second stop valve 35, a first stop valve 33 and an air filter 34, a motor stator 6 is fixedly connected with a motor cooling liquid supply pipeline 113 through a motor cooling liquid supply electronic expansion valve 36, one side of the motor cooling liquid supply pipeline 113 far away from the motor stator 6 is fixedly connected with a condenser outlet liquid phase pipeline 103, one side of the condenser outlet liquid phase pipeline 103 is fixedly connected with a condenser 13 through a liquid path electromagnetic valve 38, the lower end of a volute 11 of a centrifugal compressor is fixedly connected with a motor cooling bearing air supply and return pipeline 112 through a bearing air return pressure sensor 204, one side of the motor cooling bearing air supply and return pipeline 112 far away from the volute 11 of the centrifugal compressor is fixedly connected with an evaporator 14, one side of the volute 11 of the centrifugal compressor is fixedly connected with a compressor exhaust pipeline 102 and a main air supply pipeline 106 of the compressor exhaust bearing through an exhaust check valve 37, the side, far away from the centrifugal compressor volute 11, of the compressor exhaust pipeline 102 is fixedly connected with the condenser 13, the side, far away from the centrifugal compressor volute 11, of the compressor exhaust bearing air supply main pipeline 106 is fixedly connected with the compressor exhaust bearing air supply pipeline one 107 and the compressor exhaust bearing air supply main pipeline two 108 through the compressor exhaust bearing air supply loop one-way valve 17, the side, far away from the compressor exhaust bearing air supply main pipeline 106, of the compressor exhaust bearing air supply main pipeline two 108 is fixedly connected with the air bearing air supply main pipeline 109 through the compressor exhaust bearing air supply electromagnetic valve 20, one side of the compressor exhaust bearing air supply pipeline one 107 is fixedly connected with the heating coil air inlet 31, the output end of the centrifugal compressor volute 11 is fixedly connected with the compressor air suction pipeline 104, and the side, far away from the centrifugal compressor volute 11, of the compressor air suction pipeline 104 is fixedly connected with the evaporator 14.

One side of the upper end of the evaporator 14 is fixedly connected with a refrigerant liquid pump pipeline 105 of a condenser liquid phase outlet through an evaporator liquid supply electronic expansion valve 19, one end of the refrigerant liquid pump pipeline 105 of the condenser liquid phase outlet, which is far away from the evaporator 14, is fixedly connected with a liquid pump 15, one end of the liquid pump 15, which is far away from the evaporator 14, is fixedly connected with a refrigerant liquid pump outlet liquid supply pipeline 110 through a pump rear liquid circuit one-way valve 16, one side of the refrigerant liquid pump outlet liquid supply pipeline 110, which is far away from the liquid pump 15, is fixedly connected with a pump liquid circuit liquid inlet pipe orifice 29, the upper end of the evaporator 14 is fixedly connected with an evaporator pressure sensor 201, the lower end of the condenser 13 is fixedly connected with a compressor return gas return liquid pipeline 111 of an auxiliary evaporator through a return gas return liquid one-way valve 18, one side of the compressor return gas return liquid pipeline 111 of the auxiliary evaporator, one side of the compressor return gas return liquid pipeline 111, which is far away from the condenser 13, is fixedly connected with an auxiliary evaporator 21, the upper end of the condenser 13 is fixedly connected with a condensing pressure sensor 200, the auxiliary evaporator 21 comprises a primary perforated plate liquid separation device 27, a secondary perforated plate liquid separation device 28 and a gas-liquid separation filter screen component 26, compressor exhaust heating coil 23, liquid baffle 25 and auxiliary heating coil 24, auxiliary evaporator 21 one side fixed connection auxiliary evaporator liquid level sensor 22, one-level perforated plate liquid separation device 27 is located second grade perforated plate liquid separation device 28 upper end, gas-liquid separation filter screen subassembly 26 is located second grade perforated plate liquid separation device 28 lower extreme, compressor exhaust heating coil 23 is located gas-liquid separation filter screen subassembly 26 lower extreme, auxiliary heating coil 24 is located compressor exhaust heating coil 23 lower extreme, auxiliary evaporator 21 upper end one side fixed connection auxiliary evaporator pressure sensor 202, liquid baffle 25 one side fixed connection pump liquid way feed liquor pipe mouth 29.

Specifically, when the utility model is used, when the compressor is started, a small part of refrigerant liquid is led out from the liquid pipeline at the outlet of the high-pressure condenser 13 of the refrigeration system and enters the auxiliary evaporator 21 through the compressor return air and liquid return pipeline 111, and the small part of supercooled refrigerant liquid is about 0.5-2.5% of the total refrigerant flow; most of the refrigerant liquid at the outlet of the condenser 13, about 97.5% -99.5% of the total refrigerant flow, enters the liquid supply electronic expansion valve 19 of the main liquid supply evaporator and the evaporator 14 through the liquid phase pipeline 103 at the outlet of the condenser, in the evaporator 14, the refrigerant liquid is evaporated into refrigerant gas and returns to the suction port of the centrifugal compressor through the suction pipeline to complete the refrigeration cycle, about 0.5% -2.5% of the refrigerant liquid flows through the liquid supply electronic expansion valve 105 of the evaporator, is pressurized and pumped by the liquid pump 15, is guided by the liquid way check valve 16 to enter the auxiliary evaporator 21, the liquid pump 15 will pressurize the liquid refrigerant liquid to high pressure liquid with about 0.3-0.6MPa higher than the evaporation pressure, and the liquid refrigerant will be heated by the compressor exhaust coil 23 or the auxiliary heating coil 24 in the auxiliary evaporator 21 and flash into superheated refrigerant gas, the compressor exhaust heating coil 23 and the auxiliary heating coil 24 are arranged in series or in parallel, during the starting and stopping stages of the compressor, the gas supply of the gas bearing needs to realize the liquid gasification flash of the refrigerant by opening the auxiliary heating coil 24, and at the moment, because the compressor is not started, the gas supply main pipeline 106 of the compressor exhaust bearing has no gas flow; after the compressor is started and the high-low pressure difference of the refrigeration system is established, the auxiliary heating coil 24 and the compressor exhaust heating coil 23 can be simultaneously opened, refrigerant gas with high temperature and high pressure and overheated by compressor exhaust flows in the pipe of the compressor exhaust heating coil 23, the compressor exhaust heating coil 23 and the auxiliary heating coil 24 flash and overheat to heat liquid refrigerant in the auxiliary evaporator 21, and the refrigerant gas is introduced into the compressor exhaust bearing gas supply main pipeline 106, enters the compressor exhaust bearing gas supply pipeline one 107 and enters the compressor exhaust heating coil 23 to realize the gasification and overheating of auxiliary refrigerant liquid in the auxiliary evaporator.

Example 2: as shown in fig. 2, on the basis of fig. 1, in fig. 2, a liquid-way check valve may be added to the condenser outlet liquid-phase pipeline 103, and the check valve completely disconnects the condenser outlet liquid-phase pipeline 103 when power is cut off during sudden shutdown, so that all refrigerant gas must be supplied to the compressor exhaust bearing through the compressor exhaust line 102 and the compressor exhaust bearing gas supply main line 106 during sudden shutdown, and the time for delaying gas supply is prolonged, thereby improving the reliability during sudden power cut.

Example 3: as shown in fig. 3, on the basis of fig. 2, in fig. 3, a gas filter 34 and a front and a rear first stop valves 33 and a second stop valve 35 are added to a gas supply main pipeline 109 of a gas bearing, and the gas filter helps to eliminate fine particles in gas, because some impurities in the pipeline and a pressure container are brought into the bearing along with high-speed gas flow, which is better to ensure the operation stability of the gas bearing.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a gas bearing's centrifugal compressor's refrigerating system, its characterized in that, includes footstep bearing (1), one side fixed connection thrust lantern ring (2) is gone up to footstep bearing (1), footstep bearing (1) passes thrust lantern ring (2) one side fixed connection reverse footstep bearing (3), reverse footstep bearing (3) are kept away from footstep bearing (1) one side fixed connection non-impeller end gas journal bearing (4), non-impeller end gas journal bearing (4) are kept away from footstep bearing (1) one side fixed connection non-impeller end landing bearing (9), non-impeller end landing bearing (9) are kept away from footstep bearing (1) one side fixed connection motor rotor axle subassembly (5), motor rotor axle subassembly (5) are kept away from footstep bearing (1) one side fixed connection motor stator (6), motor stator (6) are kept away from footstep bearing (1) one side fixed connection impeller end bearing (8), impeller end landing bearing (8) keep away from footstep bearing (1) one side fixed connection impeller end gas journal bearing (7), impeller end gas journal bearing (7) keep away from footstep bearing (1) one side fixed connection impeller (10), impeller (10) outside fixed connection centrifugal compressor spiral case (11), variable diffuser mechanism (12) of fixed connection in centrifugal compressor spiral case (11), footstep bearing (1), reverse footstep bearing (3), non-impeller end gas journal bearing (4), impeller end gas journal bearing (7), impeller end landing bearing (8) and non-impeller end landing bearing (9) upper end equal fixed connection gas bearing's air feed distribution main line (100), footstep bearing (1), reverse footstep bearing (3), non-impeller end gas journal bearing (4), impeller end gas journal bearing (7), The high-pressure nozzle air supply hole pipeline (101) of the air bearing is fixedly connected on the impeller end landing bearing (8) and the non-impeller end landing bearing (9), the upper end of the air supply distribution main pipeline (100) of the air bearing is fixedly connected with an air supply pressure sensor (203), the air supply pressure sensor (203) is fixedly connected with an auxiliary evaporator air outlet pipe orifice (30) through an air bearing air supply main pipeline (109), the lower end of the auxiliary evaporator air outlet pipe orifice (30) is fixedly connected with an auxiliary evaporator (21), a second stop valve (35), a first stop valve (33) and a gas filter (34) are fixedly connected on the air bearing air supply main pipeline (109), the motor stator (6) is fixedly connected with a motor cooling liquid supply pipeline (113) through a motor cooling liquid supply electronic expansion valve (36), and the motor cooling liquid supply pipeline (113) is far away from one side of the motor stator (6) and is fixedly connected with a condenser outlet liquid phase pipeline (103), condenser export liquid phase pipeline (103) one side is through liquid way solenoid valve (38) fixed connection condenser (13), centrifugal compressor spiral case (11) lower extreme passes through bearing return air pressure sensor (204) fixed connection motor cooling bearing air feed return liquid return air pipeline (112), centrifugal compressor spiral case (11) one side fixed connection evaporimeter (14) are kept away from in motor cooling bearing air feed return liquid return air pipeline (112), centrifugal compressor spiral case (11) one side is through exhaust check valve (37) fixed connection compressor exhaust pipeline (102) and compressor exhaust bearing air feed main line (106), centrifugal compressor spiral case (11) one side fixed connection condenser (13) are kept away from in compressor exhaust pipeline (102), centrifugal compressor spiral case (11) one side is kept away from in compressor exhaust bearing air feed main line (106) through compressor exhaust bearing air feed return air check valve (17) fixed connection compressor exhaust bearing air feed pipeline (13), compressor exhaust bearing air feed main line (106) are kept away from centrifugal compressor spiral case (11) one side (107) And compressor exhaust bearing air supply main pipeline two (108), compressor exhaust bearing air supply main pipeline two (108) are kept away from compressor exhaust bearing air supply main pipeline (106) one side and are passed through compressor exhaust bearing air supply solenoid valve (20) fixed connection air supporting bearing air supply main pipeline (109), compressor exhaust bearing air supply main pipeline one (107) one side fixed connection heating coil air inlet (31), centrifugal compressor spiral case (11) output fixed connection compressor suction pipeline (104), centrifugal compressor spiral case (11) one side fixed connection evaporimeter (14) are kept away from to compressor suction pipeline (104).

2. The refrigeration system of a centrifugal compressor of a gas bearing according to claim 1, wherein one side of the upper end of the evaporator (14) is fixedly connected with a refrigerant liquid pump pipeline (105) of a condenser liquid outlet through an electronic evaporator liquid supply expansion valve (19), one end of the refrigerant liquid pump pipeline (105) of the condenser liquid outlet, which is far away from the evaporator (14), is fixedly connected with a liquid pump (15), one end of the liquid pump (15), which is far away from the evaporator (14), is fixedly connected with a refrigerant liquid pump outlet liquid supply pipeline (110) through a post-pump liquid circuit check valve (16), one side of the refrigerant liquid pump outlet liquid supply pipeline (110), which is far away from the liquid pump (15), is fixedly connected with a pump liquid circuit liquid inlet pipe orifice (29), and the upper end of the evaporator (14) is fixedly connected with an evaporator pressure sensor (201).

3. The refrigeration system of centrifugal compressor of gas bearing according to claim 1, wherein the auxiliary evaporator (21) comprises a first-stage perforated plate liquid separating device (27), a second-stage perforated plate liquid separating device (28), a gas-liquid separating screen assembly (26), a compressor exhaust heating coil (23), a liquid baffle plate (25) and an auxiliary heating coil (24), the auxiliary evaporator (21) is fixedly connected with the auxiliary evaporator liquid level sensor (22) at one side, the first-stage perforated plate liquid separating device (27) is located at the upper end of the second-stage perforated plate liquid separating device (28), the gas-liquid separating screen assembly (26) is located at the lower end of the second-stage perforated plate liquid separating device (28), the compressor exhaust heating coil (23) is located at the lower end of the gas-liquid separating screen assembly (26), and the auxiliary heating coil (24) is located at the lower end of the compressor exhaust heating coil (23), auxiliary evaporator pressure sensor (202) is connected to auxiliary evaporator (21) upper end one side fixed connection, liquid baffle (25) one side fixed connection pump liquid way feed liquor mouth of pipe (29).

4. The refrigerating system of a centrifugal compressor with a gas bearing as claimed in claim 1, wherein the lower end of the condenser (13) is fixedly connected with a compressor return air and liquid return pipeline (111) of the auxiliary evaporator through a return air and liquid return check valve (18), the compressor return air and liquid return pipeline (111) of the auxiliary evaporator is far away from a heating coil air outlet pipe orifice (32) on one side of the condenser (13), the heating coil air outlet pipe orifice (32) is far away from the auxiliary evaporator (21) fixedly connected on one side of the condenser (13), and the upper end of the condenser (13) is fixedly connected with a condensing pressure sensor (200).