High-speed motor for refrigeration compressor

Abstract

A high-speed motor for a refrigeration compressor comprises a stator, a rotor, a motor shell, a first air bearing, a second air bearing, a first bearing seat and a second bearing seat of the high-speed motor, and the first bearing seat, the rotor, the stator and the first air bearing surround one another to form a first cooling cavity. The second bearing seat, the rotor, the stator and the second air bearing are mutually surrounded to form a second cooling cavity, the first cooling cavity is communicated with the second cooling cavity through a first air channel between the rotor and the stator, and the first cooling cavity is respectively communicated with a first air inlet channel and a first cooling liquid channel; the second cooling cavity communicates with the second air inlet channel and the second cooling liquid channel. According to the high-speed motor for the refrigeration compressor, a flowing gas-liquid atomization environment is formed through the first cooling cavity and the second cooling cavity which are communicated through the first air channel, and the cooling performance of the high-speed motor is improved.

Description

Technical Field

[0001] The utility model relates to the field of high-speed motor cooling, and particularly to a high-speed motor for a refrigeration compressor. Background Art

[0002] Centrifugal refrigeration compressors, especially those equipped with aerostatic bearings, usually operate at very high speeds. Ultra-high speed and miniaturization have become an inevitable trend in the development of this type of product in the industry. The problem brought about by ultra-high speed operation is that a large amount of heat will be generated by the high-speed motor during operation. Therefore, the heat dissipation problem of the motor is very critical.

[0003] Chinese Patent Publication Nos. CN105358921B and CN115210513A disclose different cooling solutions. The common point is that a spiral groove cooling channel design is carried out on the motor stator core, and the motor stator core is fully cooled. However, the cooling of the stator coil is not sufficient. The problem brought about is that the stator core and the stator coil are cooled unevenly, resulting in a large temperature deviation. The cooling medium in the flow channel fails to fully play its maximum role. If the motor components cannot be effectively cooled during operation, and if the local temperature rise of the motor components is high due to insufficient cooling, the energy efficiency of the motor will be greatly reduced, and there are great hidden dangers for the long-term stable operation of the motor.

[0004] For the above-mentioned prior art, the object of research by those skilled in the art is how to more efficiently and stably cool the high-speed motor rotor and stator. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a high-speed motor for a refrigeration compressor with good refrigeration effect on the stator coil, stator core and rotor of the high-speed motor and without affecting the performance, aiming at the defects and deficiencies of the prior art.

[0006] To achieve the above object, the present utility model provides a high-speed motor for a refrigeration compressor, which includes a stator, a rotor, and a motor housing of the high-speed motor. First and second bearing seats are respectively provided between the two ends of the rotor and the motor housing. A first air-floating bearing is provided between the rotor and the first bearing seat, and a second air-floating bearing is provided between the rotor and the second bearing seat. The first bearing seat, the rotor, the stator, and the first air-floating bearing surround each other to form a first cooling chamber, and the second bearing seat, the rotor, the stator, and the second air-floating bearing surround each other to form a second cooling chamber. The first cooling chamber and the second cooling chamber are communicated through a first air passage between the rotor and the stator. The first cooling chamber is respectively communicated with a first intake passage and a first coolant passage to form a first gas-liquid atomization cooling environment, and the second cooling chamber is respectively communicated with a second intake passage and a second coolant passage to form a second gas-liquid atomization cooling environment. The first intake passage and the second intake passage are communicated with the exhaust sealing airway of the refrigeration compressor. The first intake passage penetrates through the first bearing seat, and the second intake passage penetrates through the second bearing seat. Due to the adoption of the first gas-liquid atomization cooling environment formed by the first cooling chamber and the second gas-liquid atomization cooling environment formed by the second cooling chamber in the present utility model, the cooling effect is better than that of the traditional cooling gas and cooling liquid, and the cooling range is more uniform and effective relative to the rotor and the stator, thereby improving the working performance of the high-speed motor. In addition, since the first intake passage and the second intake passage are communicated with the exhaust sealing airway of the refrigeration compressor, the gas will throttle when passing through the exhaust sealing airway, and a small amount of cooling gas will strengthen the gas-liquid atomization effect.

[0007] The first coolant passage is connected to the condenser of the chiller through a third coolant passage, and the first coolant passage is also connected to the second coolant passage through a spiral coolant passage. The spiral coolant passage is located between the motor housing and the stator to enhance the cooling effect of the coolant.

[0008] Two or more first nozzles are provided on the pipe wall of the first coolant passage. The spraying direction of the first nozzles corresponds to the first winding at one end of the stator, and direct spraying is adopted to improve the cooling effect; two or more second nozzles are provided on the pipe wall of the second coolant passage. The spraying direction of the second nozzles corresponds to the second winding at the other end of the stator, and direct spraying is adopted to improve the cooling effect.

[0009] The first cooling chamber is communicated with a first exhaust passage between the first air-floating bearing and the rotor. Both the third intake passage and the first intake passage are annular intake structures with the same intake direction but different intake speeds, which jointly atomize the coolant sprayed by the first nozzles; the second cooling chamber is communicated with a fourth intake passage between the second air-floating bearing and the rotor. Both the fourth intake passage and the second intake passage are annular intake structures with the same intake direction but different intake speeds, which jointly atomize the coolant sprayed by the second nozzles.

[0010] The second cooling chamber is communicated with an air outlet pipe, and the air outlet pipe is connected to the evaporator of the chiller. The arrangement of the air outlet pipe ensures that the pressure in the second cooling chamber is slightly lower than that in the first cooling chamber, so that a continuous liquid supply and exhaust state is formed between the third coolant channel and the air outlet pipe.

[0011] The cooling aerosol formed in the first gas-liquid atomization cooling environment flows through the first air duct to the second gas-liquid atomization cooling environment, and is secondarily atomized by the second air inlet channel with the opposite flow direction, further improving the atomization and cooling effects.

[0012] A first temperature sensor is installed on the first winding, a second temperature sensor is installed on the second winding, and a third temperature sensor is installed in the middle of the stator between the first winding and the second winding. The temperature measurement point lines of the first temperature sensor, the second temperature sensor, and the third temperature sensor form a temperature measurement line connection interface plug. The temperature induction at multiple points of the first temperature sensor, the second temperature sensor, and the third temperature sensor increases the temperature induction range of the stator.

[0013] The temperature and pressure of the second cooling chamber are detected by sensors, and the signals of the sensors are input into the controller. The controller controls the flow rate of the third coolant channel through a regulating valve. The sensors are located in the third chamber communicated with the second cooling chamber. The controller effectively controls the flow rate of the third coolant channel through the regulating valve by comparing the temperature and pressure data of the second cooling chamber with the data of the first temperature sensor, the second temperature sensor, and the third temperature sensor, realizing the cooling performance of the entire high-speed motor.

[0014] The coolant in the spiral coolant channel flows in a spiral direction and is opposite to the rotation direction of the rotor, and is the same as the axial flow direction of the cooling fluid in the axial first air duct, so as to further increase the cooling effect and ensure sufficient cooling and heat exchange of the stator.

[0015] The air inlet position of the air outlet pipe is lower than that of the first air duct, ensuring that the liquid coolant in the first air duct can smoothly flow back to the evaporator when the high-speed motor stops.

[0016] Adopting the above technical solution, the high-speed motor for a refrigeration compressor forms a flowing gas-liquid atomization environment through the first cooling chamber and the second cooling chamber communicated by the first air duct, improving the cooling performance of the high-speed motor. Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 is a schematic diagram of the principle of a high-speed motor for a refrigeration compressor according to the present utility model;

[0019] Figure 2 is Figure 1 a schematic cross-sectional structure diagram in the A-A direction in;

[0020] Figure 3 is a schematic diagram of the stator structure and the layout of temperature sensors in the present utility model;

[0021] Figure 4 is Figure 3 a schematic cross-sectional structure diagram in the B-B direction in;

[0022] Figure 5 is a schematic diagram of the spiral coolant channel structure in the present utility model. Specific embodiments

[0023] Next, in conjunction with the accompanying drawings in the embodiments of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0024] As Figures 1-5 shown, a high-speed motor for a refrigeration compressor includes a stator 13 of the high-speed motor, a rotor 5, and a motor housing 1. First bearing seats 2 and second bearing seats 9 are respectively provided between both ends of the rotor 5 and the motor housing 1. A first air-floating bearing 4 is provided between the rotor 5 and the first bearing seat 2, and a second air-floating bearing 10 is provided between the rotor 5 and the second bearing seat 9. The first bearing seat 2, the rotor 5, the stator 13, and the first air-floating bearing 4 surround each other to form a first cooling chamber 3, and the second bearing seat 9, the rotor 5, the stator 13, and the second air-floating bearing 10 surround each other to form a second cooling chamber 8. The first cooling chamber 3 is communicated with the second cooling chamber 8 through a first air passage 12 between the rotor 5 and the stator 13. The first cooling chamber 3 is respectively communicated with a first intake passage 25 and a first coolant passage 22 to form a first gas-liquid atomization cooling environment, and the second cooling chamber 8 is respectively communicated with a second intake passage 91 and a second coolant passage 24 to form a second gas-liquid atomization cooling environment. The first gas-liquid atomization cooling environment and the second gas-liquid atomization cooling environment cooperate with the first air passage 12 to form a cooling environment that fully wraps the rotor 5 and the stator 13 as a whole. The first intake passage 25 and the second intake passage 91 are communicated with the exhaust sealing air passage of the refrigeration compressor. The first intake passage 25 penetrates through the first bearing seat 2, and the second intake passage 91 penetrates through the second bearing seat 9.

[0025] The first coolant passage 22 is connected to the condenser of the chiller through the third coolant passage 17. The first coolant passage 22 is also connected to the second coolant passage 24 through the spiral coolant passage 23. The spiral coolant passage 23 is located between the motor housing 1 and the stator 13 to achieve the cooling performance on the surface of the stator 13. The coolant flow direction in the spiral coolant passage 23 is in the spiral direction and opposite to the rotor rotation direction.

[0026] As a structural preference, there are more than two first nozzles 21 provided on the pipe wall of the first coolant passage 22. The spraying direction of the first nozzles 21 corresponds to the first winding 33 at one end of the stator 13 to directly spray and cool down the first winding 33. There are more than two second nozzles 51 provided on the pipe wall of the second coolant passage 24. The spraying direction of the second nozzles 51 corresponds to the second winding 31 at the other end of the stator 13 to directly spray and cool down the second winding 31.

[0027] To further improve the atomization effect, the first cooling chamber 3 is connected to the first exhaust passage 6 between the first air bearing 4 and the rotor 5. The first exhaust passage 6 is cylindrical. The first intake passage 25 is provided with a certain number of air holes evenly arranged circumferentially around the rotor (5). The intake directions of the two are the same, but the intake speeds are different, and they jointly atomize the coolant sprayed by the first nozzles 21. The second cooling chamber 8 is connected to the second exhaust passage 11 between the second air bearing 10 and the rotor 5. The second exhaust passage 11 is cylindrical. The second intake passage 91 is provided with a certain number of air holes evenly arranged circumferentially around the rotor (5). The intake directions are the same, but the intake speeds are different, and they jointly atomize the coolant sprayed by the second nozzles 51.

[0028] As a secondary atomization technology function, the second cooling chamber 8 is connected to the outlet pipe 16, and the outlet pipe 16 is connected to the evaporator of the chiller. The cooling aerosol formed in the first gas-liquid atomization cooling environment flows through the first air passage 12 to the second gas-liquid atomization cooling environment, and is secondarily atomized by the second intake passage 91 with the opposite flow direction. The intake port 62 position of the outlet pipe 16 is lower than the first air passage 12 to ensure that when the high-speed motor stops, the liquid coolant in the first air passage 12 can smoothly flow back to the evaporator.

[0029] To further improve the temperature control performance, the first winding 33 is equipped with a first temperature sensor 19, the second winding 31 is equipped with a second temperature sensor 20, and a third temperature sensor 26 is installed in the middle of the stator 13 between the first winding 33 and the second winding 31. The temperature measurement point lines of the first temperature sensor 19, the second temperature sensor 20, and the third temperature sensor 26 form a temperature measurement line 32 to connect to the interface plug 15. The temperature and pressure of the second cooling chamber 8 are detected by the sensor 14. The signal of the sensor 14 is input to the controller, and the controller controls the flow rate of the third coolant passage 17 through the regulating valve 18. The sensor 14 is located in the third cavity 7 communicating with the second cooling chamber 8.

[0030] The specific working method of the present utility model is as follows: The coolant passes through the regulating valve 18, undergoes throttling and pressure reduction, and enters the first coolant channel 22 through the third coolant channel 17. Then it is divided into two cooling channel directions. The first cooling channel direction is that the coolant is sprayed into the first cooling cavity 3 through the first nozzle 21. At the same time, a part of the gas in the compressor exhaust leaks into the first cavity 3 through the first intake channel 25. A small amount of cooling gas leaks from the first air bearing 4 to the first cavity 3 through the first exhaust passage 6. The gas in the first cavity 3 atomizes the coolant to fully cool the first winding 33, and then the atomized fluid enters the second cooling cavity 8 through the first air passage 12.

[0031] The second cooling channel direction in the two cooling channel directions is that the coolant after entering the first coolant channel 22 cools the stator 13 through the spiral coolant channel 23, and then the coolant is sprayed into the second cooling cavity 8 through the second nozzle 51 to fully cool the second winding 31; the cooled aerosol in the second cooling cavity 8 enters the evaporator of the chiller through the air outlet pipe 16.

[0032] The sensor 14 detects the temperature and pressure of the gas in the second cooling cavity 8 and inputs the signal into the controller to detect the atomization state of the coolant. At the same time, three temperature sensors arranged on the stator are used to detect the working temperature of the stator. The cooling effect of the high-speed motor is comprehensively judged based on the coolant atomization state and the stator temperature, and the regulating valve 18 is used to control the coolant to achieve the optimal flow rate.

[0033] Although the embodiments of the present utility model have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present utility model. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present utility model without departing from the principle and purpose of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A high-speed motor for a refrigeration compressor, comprising a stator (13), a rotor (5) and a motor housing (1) of the high-speed motor, wherein a first bearing seat (2) and a second bearing seat (9) are respectively arranged between two ends of the rotor (5) and the motor housing (1), a first air bearing (4) is arranged between the rotor (5) and the first bearing seat (2), and a second air bearing (10) is arranged between the rotor (5) and the second bearing seat (9), wherein: The first bearing seat (2), the rotor (5), the stator (13), and the first air-floating bearing (4) surround each other to form a first cooling chamber (3); the second bearing seat (9), the rotor (5), the stator (13), and the second air-floating bearing (10) surround each other to form a second cooling chamber (8); the first cooling chamber (3) and the second cooling chamber (8) are connected via a first air passage (12) between the rotor (5) and the stator (13); the first cooling chamber (3) is connected to a first air inlet passage (25) and a first coolant passage (22); the second cooling chamber (8) is connected to a second air inlet passage (91) and a second coolant passage (24); the first air inlet passage (25) and the second air inlet passage (91) are connected to an exhaust sealing air passage of a refrigeration compressor; the first air inlet passage (25) passes through the first bearing seat (2); and the second air inlet passage (91) passes through the second bearing seat (9).

2. A high-speed motor for a refrigeration compressor according to claim 1, characterized in that: The first coolant channel (22) is connected to the condenser of the chiller via the third coolant channel (17), and the first coolant channel (22) is simultaneously connected to the second coolant channel (24) via the spiral coolant channel (23), wherein the spiral coolant channel (23) is located between the motor housing (1) and the stator (13).

3. A high-speed motor for a refrigeration compressor according to claim 2, characterized in that: More than two first nozzles (21) are provided on the tube wall of the first cooling liquid channel (22), and the spraying direction of the first nozzles (21) corresponds to the first winding (33) at one end of the stator (13); and more than two second nozzles (51) are provided on the tube wall of the second cooling liquid channel (24), and the spraying direction of the second nozzles (51) corresponds to the second winding (31) at the other end of the stator (13).

4. A high-speed motor for a refrigeration compressor according to claim 1, characterized in that: The first cooling chamber (3) is connected to a first exhaust passage (6) between the first air bearing (4) and the rotor (5); the first exhaust passage (6) is cylindrical; the first air inlet passage (25) is a certain number of air holes evenly arranged around the circumference of the rotor (5); the two have the same air inlet direction but different air inlet speeds, and together atomize the coolant sprayed by the first nozzle (21); the second cooling chamber (8) is connected to a second exhaust passage (11) between the second air bearing (10) and the rotor (5); the second exhaust passage (11) is cylindrical; the second air inlet passage (91) is a certain number of air holes evenly arranged around the circumference of the rotor (5); the two have the same air inlet direction but different air inlet speeds, and together atomize the coolant sprayed by the second nozzle (51).

5. A high-speed motor for a refrigeration compressor according to claim 4, characterized in that: The second cooling chamber (8) is connected to an air outlet pipe (16), and the air outlet pipe (16) is connected to an evaporator of a chiller.

6. A high-speed motor for a refrigeration compressor according to claim 1, characterized in that: The cooling mist in the first cooling chamber forms a first gas-liquid atomization cooling environment, which flows through the first air passage (12) to the second gas-liquid atomization cooling environment, and is secondary atomized by the second air inlet passage (91) with the opposite flow direction.

7. A high-speed motor for a refrigeration compressor according to claim 3, characterized in that: The first winding (33) is installed with a first temperature sensor (19), the second winding (31) is installed with a second temperature sensor (20), a third temperature sensor (26) is installed in the middle of the stator (13) between the first winding (33) and the second winding (31), and a temperature measurement point circuit of the first temperature sensor (19), the second temperature sensor (20) and the third temperature sensor (26) forms a temperature measurement line (32) connected to an interface plug (15).

8. The high-speed motor for a refrigeration compressor according to claim 1, characterized in that: The temperature and pressure of the second cooling chamber (8) are detected by a sensor (14), and a signal of the sensor (14) is input into a controller. The controller controls the flow of the third cooling liquid channel (17) through a regulating valve (18). The sensor (14) is located in a third cavity (7) connected to the second cooling chamber (8).

9. A high-speed motor for a refrigeration compressor according to claim 2, characterized in that: The coolant in the spiral coolant channel (23) flows in a spiral direction and is opposite to the rotation direction of the rotor.

10. The high-speed motor for a refrigeration compressor according to claim 5, characterized in that: The air inlet (62) of the air outlet pipe (16) is located lower than the first air channel (12).

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