Cooling device and cooling method for magnetic suspension compressor

Abstract

The invention belongs to the technical field of magnetic suspension compressors and discloses a magnetic suspension compressor cooling device and method.The magnetic suspension compressor cooling device comprises a machine shell, a motor stator and a rotor are sequentially arranged in the machine shell, radial magnetic bearings are arranged at the two ends of the motor stator, a thrust disc is arranged at the right ends of the radial magnetic bearings, and axial magnetic bearings are arranged at the two ends of the thrust disc; the thrust disc is fixedly connected with the rotor, the radial magnetic bearing and the axial magnetic bearing are arranged on the outer surface of the rotor in a sleeving mode, an air inlet is formed in the machine shell in the direction of the radial magnetic bearing and the axial magnetic bearing, a water cooling flow channel unit is arranged on the side wall of the machine shell, and air cooling and water cooling work at the same time in the low-load or high-load operation state. The problems that the performance of parts is reduced and the service life is shortened due to overheating are avoided, the operation stability and reliability are improved, the baffles are in an inclined state and are arranged side by side in a staggered mode, the contact area of cooling water and the partition plates can be increased, the stable flowing state of the cooling water is broken, and the cooling water generates the turbulent flow phenomenon in a flow channel.

Description

Technical Field

[0001] This invention belongs to the field of magnetic levitation compressor technology, and relates to a cooling device and cooling method for a magnetic levitation compressor. Background Technology

[0002] The stable operation of magnetic levitation high-speed motors in compressor units mainly relies on the cooling system, with existing cooling solutions including air cooling and water cooling. Air cooling has a simple structure, but its heat dissipation capacity is insufficient due to the low specific heat capacity of air, making it difficult to cope with the large amount of heat generated when the motor is running at high speed, resulting in unsatisfactory cooling effect. Although water cooling utilizes the high specific heat capacity of water, there is a physical gap between the cooling water channels and the core heat-generating components inside the motor, resulting in a long heat conduction path and high resistance, preventing the heat from being directly and efficiently removed.

[0003] The internal airflow and water cooling channels can improve heat dissipation. However, the airflow organization within the casing is simplistic, relying solely on a limited number of vents to create a fixed flow. This lack of differentiation in design for the heating characteristics of different functional areas within the motor leads to airflow stagnation zones, insufficient localized heat exchange, and uneven temperature distribution. Existing water cooling systems often employ straight or annular water flow channels, significantly reducing fluid velocity in wide cross-section areas. Furthermore, the absence of guiding or turbulence structures in low-speed flow areas creates "dead zones," limiting heat transfer. The axial magnetic bearing, located within the motor's structural enclosure, is surrounded by limited space and lacks an independent air intake channel or guiding structure, resulting in poor airflow and insufficient heat dissipation. Under high load or prolonged operation, the axial bearing experiences rapid temperature rise, leading to performance degradation or even failure. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a cooling device and cooling method for a magnetic levitation compressor.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: This invention provides a cooling device for a magnetic levitation compressor, comprising a housing, within which a motor stator and a rotor are sequentially arranged. Radial magnetic bearings are provided at both ends of the motor stator, a thrust plate is provided at the right end of the radial magnetic bearings, and axial magnetic bearings are provided at both ends of the thrust plate. The thrust plate is fixedly connected to the rotor. The radial and axial magnetic bearings are sleeved on the outer surface of the rotor. An air inlet is provided on the housing along the direction of the radial and axial magnetic bearings. A water-cooled flow channel unit is provided on the side wall of the housing.

[0006] Furthermore, the water-cooled flow channel unit includes a partition, with an inlet pipe and an outlet pipe respectively provided at both ends of the partition. The inlet pipe and outlet pipe are used to connect to an external cooling water system, and each partition is provided with several baffles.

[0007] Furthermore, one end of the axial magnetic bearing is provided with a ventilation hole along the air inlet direction, and several ventilation holes are arranged circumferentially. One end of the axial magnetic bearing is also provided with a guide plate, and the guide plate is fixedly connected to the ventilation hole.

[0008] Furthermore, the axial magnetic bearing has a through-hole on the inner annular surface side near the rotor.

[0009] Furthermore, the rotor includes a rotor core, a radial magnetic bearing bushing, a motor bushing, an axial magnetic bearing bushing, and a thrust disk arranged coaxially. The radial magnetic bearing bushing is disposed at both ends of the motor bushing, and the thrust disk is disposed between two adjacent axial magnetic bearing bushings. The thrust disk is sleeved on the outer surface of the rotor core.

[0010] Furthermore, the air inlet includes a first air inlet, a second air inlet, a third air inlet, a fourth air inlet, and a fifth air inlet. The first air inlet is used for air cooling of the thrust disc, the second air inlet is used for air cooling of the motor bushing, and the third, fourth, and fifth air inlets are used for air cooling of the radial magnetic bearing bushing.

[0011] Furthermore, square slots are provided on the axial magnetic bearing bushing and the rotor core, and two square slots on the same horizontal line on both sides of the thrust disk are interconnected.

[0012] Furthermore, a volute is fixedly connected to one end of the housing, and an impeller is disposed inside the volute. The impeller is fixedly installed at one end of the rotor. A protective bearing is sleeved on the outer surface of the rotor, and the rotor is fixedly connected to the housing through the protective bearing.

[0013] Furthermore, a base is fixedly connected to the lower end of the housing. A cooling method for a magnetic levitation compressor, based on the aforementioned magnetic levitation compressor cooling device, includes the following steps: Cooling liquid is introduced into the water-cooled flow channel unit, and the cooling liquid exchanges heat with the side wall of the housing and the motor stator through the water-cooled flow channel unit to achieve water cooling; cooling gas is introduced into the air inlet, and the cooling gas enters the housing through the air inlet to achieve air cooling of the radial magnetic bearing, thrust plate and axial magnetic bearing.

[0014] Compared with the prior art, the present invention has the following beneficial technical effects: This invention discloses a cooling device for a magnetic levitation compressor. Air inlets are provided on the casing along the radial and axial directions of the magnetic bearings, allowing cooling gas to be introduced into the casing for air cooling of the radial and axial magnetic bearings, thus preventing high temperatures from affecting the lifespan during prolonged operation. A water-cooling channel unit is provided on the side wall of the casing, using circulating cooling water to cool the casing and the motor stator inside. This combination of air and water cooling improves cooling efficiency and extends service life.

[0015] The present invention discloses a cooling device for a magnetic levitation compressor. Two square slots on the same horizontal line on both sides of the thrust plate are interconnected to form a through cooling channel, which directly removes the wind friction heat generated during the rotation of the thrust plate and rotor, as well as the electromagnetic heat generated when the axial magnetic bearing is working, thereby improving the cooling effect of the axial bearing area and avoiding the decline in magnetic levitation performance due to overheating of the axial bearing components.

[0016] This invention discloses a cooling device for a magnetic levitation compressor. The guide plate adopts an arc-shaped structure to guide the cooling airflow, allowing the airflow to enter the axial magnetic bearing along the arc of the guide plate. This reduces the impact resistance when the airflow enters, increases the intake volume, and improves the flow efficiency of the cooling airflow. The present invention provides a cooling device for a magnetic levitation compressor, wherein the baffles are inclined and arranged in an alternating manner, which can increase the contact area between the cooling water and the baffles, break the steady flow state of the cooling water, and cause the cooling water to generate turbulence in the flow channel.

[0017] This invention provides a cooling device for a magnetic levitation compressor. In the event of a rotor malfunction, the protective bearing can limit radial and axial displacement, thus providing protection and preventing the rotor from colliding with the casing, thereby ensuring equipment safety. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a magnetic levitation compressor cooling device according to the present invention; Figure 2 This is a front view of a magnetic levitation compressor cooling device according to the present invention; Figure 3 This is a right view of a magnetic levitation compressor cooling device according to the present invention; Figure 4 This is a left view of a magnetic levitation compressor cooling device according to the present invention; Figure 5 This is a schematic diagram of the rotor structure in an embodiment of the present invention; Figure 6 This is a schematic diagram of the square groove in an embodiment of the present invention; Figure 7 This is a top view of the axial magnetic bearing in an embodiment of the present invention; Figure 8 This is a cross-sectional view of the axial magnetic bearing in an embodiment of the present invention; Figure 9 This is a front view of the casing in an embodiment of the present invention; Figure 10 This is a schematic diagram of the structure of the water-cooled flow channel unit in an embodiment of the present invention.

[0019] Figure label: 1-Casing; 2-Motor stator; 3-Rotor; 31-Rotor core; 32-Radial magnetic bearing sleeve; 33-Motor sleeve; 34-Axial magnetic bearing sleeve; 35-Thrust disc; 36-Square slot; 4-Radial magnetic bearing; 5-Axial magnetic bearing; 51-Ventilation hole; 52-Guide plate; 53-Pass through; 6-Water-cooled flow channel unit; 61-Baffle; 62-Water inlet pipe; 63-Water outlet pipe; 64-Baffle; 7-Air inlet; 71-First air inlet; 72-Second air inlet; 73-Third air inlet; 74-Fourth air inlet; 75-Fifth air inlet; 8-Vortex casing; 9-Impeller; 10-Protective bearing. Detailed Implementation

[0020] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0021] Example 1 This invention provides a cooling device for a magnetic levitation compressor, such as... Figure 1 As shown, the device includes a housing 1, inside which a motor stator 2 and a rotor 3 are arranged in sequence. Radial magnetic bearings 4 are provided at both ends of the motor stator 2. A thrust disk 35 is provided at the right end of the radial magnetic bearing 4. Axial magnetic bearings 5 ​​are provided at both ends of the thrust disk 35. The thrust disk 35 is fixedly connected to the rotor 3. The radial magnetic bearings 4 and axial magnetic bearings 5 ​​are sleeved on the outer surface of the rotor 3. An air inlet 7 is provided on the housing 1 along the direction of the radial magnetic bearings 4 and axial magnetic bearings 5. A water-cooled flow channel unit 6 is provided on the side wall of the housing 1.

[0022] A magnetic levitation compressor cooling device includes a housing 1, within which a motor stator 2 and a rotor 3 are sequentially arranged. The motor stator 2 generates a rotating magnetic field to drive the rotor 3 to rotate. The motor stator 2 is fixedly connected to the inner wall of the housing 1 by bolts and has three-phase windings embedded inside. When three-phase alternating current is applied, it generates a rotating magnetic field, which interacts with the rotor 3 to generate electromagnetic torque, driving the rotor 3 to rotate at high speed and providing a power source.

[0023] A volute 8 is fixedly connected to the left end of the casing 1. An impeller 9 is housed inside the volute 8 and is fixedly mounted to one end of the rotor 3. When the rotor 3 rotates, the impeller 9 rotates in the same direction, its blades performing work on the gas. The volute 8 collects the high-speed airflow ejected by the impeller, converting kinetic energy into pressure energy. A protective bearing 10 is fixedly connected to the casing 1 on the outer surface of the rotor 3. During normal operation, the protective bearing 10 does not contact the rotor 3. In case of a malfunction, it limits radial and axial displacement, providing protection and preventing direct collision between the rotor 3 and the casing, thus ensuring equipment safety. A fixed base is provided at the lower end of the casing 1 to provide stable support and reduce the impact of vibration on the cooling device.

[0024] The rotor 3 includes a coaxially arranged rotor core 31, motor bushing 33, axial magnetic bearing bushing 34, and thrust disk 35. The thrust disk 35 cooperates with the axial magnetic bearing 34 for axial suspension support. The rotor core 31 interacts with the rotating magnetic field generated by the motor stator 2, thereby generating an electromagnetic torque to drive the rotor 3 to rotate. Radial magnetic bearing bushings 32 are fixedly connected to both ends of the motor bushing 33, cooperating with the radial magnetic bearings for radial suspension support. One end of the radial magnetic bearing bushing 32 is fixedly connected to the motor bushing 33, and the other end is fixedly connected to the rotor core 31 and the axial magnetic bearing bushing 34 respectively. Figure 5 As shown.

[0025] Square slots 36 are provided on the axial magnetic bearing sleeve 34 and the rotor core 31. The square slots 36 are distributed along the circumference of the axial magnetic bearing sleeve 34, and two square slots on the same horizontal line on both sides of the thrust disk 35 are interconnected to form a through cooling channel. Figure 6 As shown. The cooling channel allows the cooling airflow to circulate freely between the two sides of the thrust plate 35, directly carrying away the wind friction heat generated during the rotation of the thrust plate 35 and the rotor 3, as well as the electromagnetic heat generated when the axial magnetic bearing 5 is working, thereby improving the cooling effect of the axial bearing area and preventing the magnetic levitation performance from deteriorating due to overheating of the axial bearing components.

[0026] The radial magnetic bearing 4 generates radial magnetic force by adjusting the magnitude and direction of the current in the electromagnetic coil in real time through the control system. This radial magnetic force interacts with the radial magnetic bearing sleeve 32 on the rotor 3, maintaining the rotor 3 in a stable, non-contact levitation state in the radial direction. A thrust disk 35 is located at the right end of the radial magnetic bearing 4, fixedly connected to the rotor 3 and rotating together with it. Axial magnetic bearings 5 ​​are located at both ends of the thrust disk 35. These axial magnetic bearings employ electromagnetic levitation, generating axial magnetic force by adjusting the current parameters of the axial electromagnetic coil. This axial magnetic force interacts with the thrust disk 35, stably levitizing the rotor 3 in the axial direction, limiting its axial displacement, and preventing axial movement. The radial magnetic bearing 4 and axial magnetic bearing 5 are located on the outer surface of the rotor 3, constraining its spatial position through magnetic force, thus leviting the rotor 3, eliminating frictional losses from mechanical bearings, and reducing heat generated by friction.

[0027] A ventilation hole 51 is provided near the thrust plate surface along the air inlet direction of the axial magnetic bearing 5. Several ventilation holes 51 are evenly arranged circumferentially, with the included angle between the centers of adjacent ventilation holes 51 being equal, ensuring uniform entry of cooling airflow and providing a channel for cooling airflow. A guide plate 52 is also provided around the ventilation hole 51 near the air inlet 71 of the axial magnetic bearing 5. The guide plate 52 is fixedly connected to the ventilation hole 51 and adopts an arc-shaped design, such as... Figure 7 As shown, the arc-shaped guide plate 52 guides the cooling airflow, allowing it to enter the axial magnetic bearing 5 along its curvature. This effectively reduces the impact resistance during airflow entry, increases the intake volume, and thus improves the flow efficiency of the cooling airflow. The other end of the axial magnetic bearing 5 has a through-hole 53, which corresponds to the ventilation hole, forming an airflow channel. This allows the cooling airflow to enter from the ventilation hole 51, pass through the axial magnetic bearing 5, and exit from the through-hole 53 for convection cooling. Figure 8 As shown.

[0028] An air inlet 7 is provided on the housing 1 along the radial direction of the magnetic bearing 4 and the axial direction of the magnetic bearing 5, such as Figure 2As shown, the air inlet 7 includes a first air inlet 71, a second air inlet 72, a third air inlet 73, a fourth air inlet 74, and a fifth air inlet 75. The first air inlet is used for air cooling of the thrust disc 35. The thrust disc 35 rotates at high speed with the rotor 3. Cooling airflow is blown onto the surface of the thrust disc 35 to remove heat generated during rotation due to air friction and interaction with the axial magnetic bearing 5, preventing deformation of the thrust disc 35 due to overheating. The second air inlet 72 is used for air cooling of the motor bushing 33. The cooling airflow acts directly on the surface of the motor bushing 33, preventing overheating due to air friction and electromagnetic induction. The third air inlet 73, the fourth air inlet 74, and the fifth air inlet 75 are used for air cooling of the radial magnetic bearing bushing 32. The third air inlet 73, the fourth air inlet 74, and the fifth air inlet 75 are respectively provided for different parts of the radial magnetic bearing bushing 32, such as... Figure 3 He Ru Figure 4 As shown, the radial magnetic bearing bushing 32 is cooled in all directions, which can obtain a uniform cooling airflow to remove the electromagnetic heat generated by the interaction with the radial magnetic bearing 4, avoid the magnetic stability of the radial magnetic bearing 4 due to local overheating, and ensure the radial suspension accuracy of the rotor 3.

[0029] A water-cooled flow channel unit 6 is provided on the side wall of the casing 1. The water-cooled flow channel unit 6 includes a baffle 61. Inlet pipes 62 and outlet pipes 63 are respectively provided at both ends of the baffle 61. The inlet pipes 62 and outlet pipes 63 are used to connect to an external cooling water system to form a circulating cooling system. Each baffle 61 is provided with several baffles 63. The three baffles 64 are all inclined and arranged alternately, which can increase the contact area between the cooling water and the baffle 61, and at the same time break the steady flow of the cooling water, causing turbulence in the flow channel. The turbulent cooling water can make more thorough contact with the baffle 61, improving heat exchange efficiency. During operation, the cooling water enters the water-cooled flow channel unit 6 from the inlet pipe 62 and flows under the guidance of the baffles 64. During the flow, it absorbs the heat conducted from the casing 1 to the baffle 61, and then flows out from the outlet pipe 63, enters the external cooling system for cooling, and then recirculates back in. Figure 9 He Ru Figure 10 As shown, the temperature of the casing 1 is effectively reduced through circulating heat exchange, which indirectly cools the heat-generating components inside the casing 1.

[0030] In summary, the cooling system for the magnetic levitation compressor combines air cooling and water cooling, solving the heat dissipation problem of the magnetic levitation compressor during high-speed operation. Forced convection cooling is provided through multiple air inlets 7, while heat conduction cooling is achieved through the water-cooled flow channel unit 6 on the side wall of the casing 1. Whether operating under low or high load conditions, air cooling and water cooling work simultaneously, preventing problems such as performance degradation and shortened service life of components due to overheating, thus improving operational stability and reliability.

[0031] Example 2 The present invention discloses a cooling method for a magnetic levitation compressor, comprising the following steps: introducing cooling liquid into the water-cooled flow channel unit 6, wherein the cooling liquid exchanges heat with the side wall of the housing 1 and the motor stator 2 through the water-cooled flow channel unit 6 to achieve water-cooling cooling; introducing cooling gas into the air inlet 7, wherein the cooling gas enters the housing 1 through the air inlet 7 to achieve air-cooling cooling of the radial magnetic bearing 4, the thrust plate 35 and the axial magnetic bearing 5.

[0032] Water cooling: Cooling liquid is introduced into the water cooling channel unit 6. The cooling liquid enters the baffle 61 of the water cooling channel unit 6 from the inlet pipe 62. Under the guidance of the baffle 64, it forms a turbulent flow. During the flow of the cooling liquid in the baffle 61, it exchanges heat with the side wall of the housing 1 through the water cooling channel unit 6, carrying away the heat generated by the operation of the motor and the working of the magnetic bearing. The cooling liquid also exchanges heat with the motor stator 2, absorbing the Joule heat generated when the winding of the motor stator 2 is energized and the heat generated by the eddy current loss of the iron core. After the heat exchange, the temperature of the cooling liquid increases and flows out from the outlet pipe 63.

[0033] Air cooling: Cooling gas is introduced into the air inlet 7, and the cooling gas enters the housing 1 through the first air inlet 71, the second air inlet 72, the third air inlet 73, the fourth air inlet 74, and the fifth air inlet 75. The cooling gas entering through the first air inlet 71 blows directly onto the surface of the thrust disk 35, carrying away the heat generated by air resistance and eddies when the thrust disk 35 rotates at high speed. In addition, the cooling gas forms a through airflow through the interconnected square grooves 36 on the axial magnetic bearing bushings 34 on both sides of the thrust disk 35, further cooling the thrust disk 35 and the rotor 3.

[0034] The cooling gas entering through the second air inlet 72 cools the motor bushing 33 by air cooling. The cooling gas flows along the surface of the motor bushing 33 and absorbs the heat generated by electromagnetic induction and mechanical stress in the motor bushing 33.

[0035] The cooling gas entering through the third air inlet 73, the fourth air inlet 74, and the fifth air inlet 75 provides air cooling to the radial magnetic bearing bushing 4, ensuring that all areas of the radial magnetic bearing bushing are cooled.

[0036] Cooling gas also enters the interior of the axial magnetic bearing 34 through the ventilation hole 51 at one end of the axial magnetic bearing 5. Under the guidance of the guide plate 52, it forms an airflow to convectively cool the electromagnetic coil and iron core of the axial magnetic bearing 5, absorb the electromagnetic heat generated when the axial magnetic bearing 34 is working, and then flows out from the port 53 at the other end of the axial magnetic bearing 5 to cool the axial magnetic bearing 5 by air.

[0037] In summary, the magnetic levitation compressor is cooled using both water cooling and air cooling. Water cooling removes heat from the casing 1 and motor stator 2, offering advantages such as high cooling efficiency and large heat capacity. Air cooling cools the radial magnetic bearing 4, axial magnetic bearing 5, and rotor 3, providing fast response and uniform cooling. This ensures stable temperatures for all components during high-speed operation, preventing overheating-related failures of the radial and axial magnetic bearings 4 and 5, as well as motor performance degradation, thus extending the compressor's lifespan.

[0038] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

Claims

1. A cooling device for a magnetic levitation compressor, characterized in that: The device includes a housing (1), in which a motor stator (2) and a rotor (3) are arranged in sequence. Radial magnetic bearings (4) are arranged at both ends of the motor stator (2). A thrust disk (35) is arranged at the right end of the radial magnetic bearing (4). Axial magnetic bearings (5) are arranged at both ends of the thrust disk (35). The thrust disk (35) is fixedly connected to the rotor (3). The radial magnetic bearings (4) and axial magnetic bearings (5) are sleeved on the outer surface of the rotor (3). An air inlet (7) is arranged on the housing (1) along the direction of the radial magnetic bearings (4) and the axial magnetic bearings (5). A water-cooled flow channel unit (6) is arranged on the side wall of the housing (1).

2. The cooling device for the magnetic levitation compressor according to claim 1, characterized in that: The water-cooled flow channel unit (6) includes a partition (61), with an inlet pipe (62) and an outlet pipe (63) respectively provided at both ends of the partition (61). The inlet pipe (62) and the outlet pipe (63) are used to connect to an external cooling water system. Each partition (61) is provided with several baffles (64).

3. The cooling device for the magnetic levitation compressor according to claim 2, characterized in that: One end of the axial magnetic bearing (5) is provided with a ventilation hole (51) along the direction of the air inlet (7), and a plurality of ventilation holes (51) are provided in the circumferential direction. One end of the axial magnetic bearing (5) is also provided with a guide plate (52), and the guide plate (52) is fixedly connected to the ventilation hole (51).

4. The cooling device for the magnetic levitation compressor according to claim 3, characterized in that: The axial magnetic bearing (5) has a port (53) on the inner ring side near the rotor (3).

5. The cooling device for a magnetic levitation compressor according to claim 1, characterized in that: The rotor (3) includes a rotor core (31) coaxially arranged, a radial magnetic bearing bushing (32), a motor bushing (33), an axial magnetic bearing bushing (34), and a thrust disk (35). The radial magnetic bearing bushing (32) is arranged at both ends of the motor bushing (33), and the thrust disk (35) is arranged between two adjacent axial magnetic bearing bushings (34). The thrust disk (35) is sleeved on the outer surface of the rotor core (31).

6. The cooling device for a magnetic levitation compressor according to claim 5, characterized in that: The air inlet (7) includes a first air inlet (71), a second air inlet (72), a third air inlet (73), a fourth air inlet (74), and a fifth air inlet (75). The first air inlet (71) is used for air cooling of the thrust plate (35), the second air inlet (72) is used for air cooling of the motor bushing (33), and the third air inlet (73), the fourth air inlet (74), and the fifth air inlet (75) are used for air cooling of the radial magnetic bearing bushing (32).

7. The cooling device for a magnetic levitation compressor according to claim 5, characterized in that: The axial magnetic bearing bushing (34) and the rotor core (31) are provided with square slots (36), and the two square slots (36) on the same horizontal line on both sides of the thrust disk (35) are connected to each other.

8. The cooling device for a magnetic levitation compressor according to claim 1, characterized in that: The housing (1) is provided with a fixedly connected volute (8) at one end, and an impeller (9) is provided inside the volute (8). The impeller (9) is fixedly installed at one end of the rotor (3). The outer surface of the rotor (3) is provided with a protective bearing (10), which is fixedly connected to the housing (1).

9. The cooling device for a magnetic levitation compressor according to claim 8, characterized in that: The lower end of the housing (1) is provided with a fixedly connected base.

10. A cooling method for a magnetic levitation compressor, characterized in that, The magnetic levitation compressor cooling device according to any one of claims 1-9 includes the following steps: Cooling liquid is introduced into the water-cooled flow channel unit (6). The cooling liquid exchanges heat with the side wall of the housing (1) and the motor stator (2) through the water-cooled flow channel unit (6) to achieve water cooling. Cooling gas is introduced into the air inlet (7) and enters the housing (1) through the air inlet (7) to cool the radial magnetic bearing (4), thrust disk (35) and axial magnetic bearing (5) by air cooling.

Images