An MCL compression system driven by a magnetic levitation motor connected via a magnetic coupling

Abstract

The present invention relates to the field of MCL compressors, and in particular to an MCL compression system driven by a magnetic levitation motor connected via a magnetic coupling. The system comprises a magnetic levitation motor, a magnetic coupling, and an MCL compressor; the magnetic levitation motor is provided with a motor shaft, the magnetic coupling is provided with a magnetic outer rotor and a magnetic inner rotor, and the MCL compressor is provided with a compressor shaft; the magnetic outer rotor comprises an outer rotor seat and an outer rotor magnet; the outer rotor seat is provided with an outer rotor magnet hole, a motor shaft matching hole, and an axial motor shaft screw hole; the motor shaft end face is provided with a threaded hole, a screw passes through the motor shaft screw hole and screws into the threaded hole of the motor shaft; the magnetic inner rotor comprises an inner rotor seat and an inner rotor magnet; the inner rotor seat is provided with an axial compressor screw hole, the compressor shaft end face is provided with a threaded hole, a screw passes through the compressor screw hole and screws into the threaded hole of the compressor shaft. The system reduces the number and volume of equipment and ensures rapid assembly of the equipment.

Description

Technical Field

[0001] The present invention relates to the field of MCL compressors, and in particular to an MCL compression system driven by a magnetic levitation motor connected via a magnetic coupling. Background Art

[0002] A centrifugal compressor is a type of gas compression machine with rotating blades. Gas is drawn into an intake chamber and acts on it through an impeller, increasing its pressure, velocity, and temperature. It then passes through a diffuser, where its velocity is reduced and kinetic energy is converted into pressure energy, increasing its pressure. The gas then flows through a guide bend and return flow device, allowing it to enter the next stage of compression. Finally, the high-pressure gas from the final stage is discharged through the volute and gas pipe.

[0003] A Chinese utility model patent application (publication number CN202579201U, publication date: 20121205) discloses a single-shaft, multi-stage centrifugal compressor comprising a multi-stage impeller, each stage utilizing a three-dimensional impeller. The design of the three-dimensional twisted blades more closely resembles the actual flow of gas within the impeller, essentially eliminating secondary flow losses in the compressor. This minimizes flow losses and increases efficiency, resulting in an 8-10% improvement in efficiency and 2-10% energy savings over existing similar compressors. The three-dimensional impeller exhibits excellent pressure-boosting capability, enabling a smaller impeller diameter than conventional impellers, resulting in a lower moment of inertia and reduced motor starting current, ensuring safer and more reliable operation. The three-dimensional impeller centrifugal compressor also boasts a flat overall performance curve, with surge flow rates as low as 50-70% of the design flow rate. Compared to conventional impeller centrifugal compressors, this shifts the overall surge flow rate to a smaller value, improving compressor reliability.

[0004] The existing technology has the following shortcomings: the traditional MCL type compressor is supported by sliding bearings at both ends and is connected to the speed increaser through a mechanical coupling, and the speed increaser is further connected to the three-phase asynchronous motor; in this method, the compressor and the motor need to pass through the speed increaser, which increases the number and volume of equipment; at the same time, the mechanical coupling has high requirements for the concentricity between the compressor shaft and the speed increaser shaft when connected. During assembly, the two need to be adjusted multiple times to ensure concentricity, which is not conducive to the rapid assembly of the equipment. Summary of the Invention

[0005] The purpose of the present invention is to address the above-mentioned problems and propose a method of directly connecting a magnetic levitation motor to an MCL compressor via a magnetic coupling, eliminating the need for a speed increaser and reducing the number and size of equipment. Furthermore, torque is transmitted contactlessly between the motor shaft and the compressor shaft, and the concentricity requirements for the shaft systems at both ends are much lower than those of traditional mechanical couplings. This ensures rapid assembly of an MCL compression system driven by a magnetic levitation motor connected via a magnetic coupling.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0007] The invention discloses an MCL compression system driven by a magnetic levitation motor connected via a magnetic coupling. The system comprises a magnetic levitation motor, a magnetic coupling and an MCL compressor. The magnetic levitation motor is provided with a motor shaft, the magnetic coupling is provided with a magnetic outer rotor and a magnetic inner rotor, and the MCL compressor is provided with a compressor rotating shaft. The magnetic outer rotor comprises an outer rotor seat and an outer rotor magnet. The outer rotor seat is provided with an outer rotor magnet hole, a motor shaft matching hole and an axial motor shaft screw hole. The outer rotor magnet is fixed to the inner wall of the outer rotor magnet hole, and the motor shaft matching hole matches the outer wall of the motor shaft. The end face of the motor shaft is provided with a threaded hole, and a screw passes through the motor shaft screw hole and is screwed into the threaded hole of the motor shaft. The magnetic inner rotor comprises an inner rotor seat and an inner rotor magnet. The inner rotor magnet is fixed to the outer wall of the inner rotor seat, and the inner rotor magnet is aligned with the outer rotor magnet. The inner rotor seat is provided with an axial compressor screw hole, and the end face of the compressor rotating shaft is provided with a threaded hole. The screw passes through the compressor screw hole and is screwed into the threaded hole of the compressor rotating shaft.

[0008] Preferably, the MCL compressor is further provided with a compressor casing, multiple diffuser plates and a compressor magnetic bearing device; the multiple diffuser plates are fixed in the compressor casing, and the compressor shaft is fixed with multiple impellers, and the multiple impellers are respectively located in multiple corresponding diffuser plates; the compressor magnetic bearing device is sleeved on the compressor shaft and is used to support and limit the compressor shaft in the radial and axial directions.

[0009] Preferably, the compressor magnetic bearing device includes a compressor bearing seat, a compressor radial magnetic bearing, a compressor axial magnetic bearing, a compressor test body and multiple compressor sensors, and the compressor shaft is provided with a compressor bearing rotor and a compressor thrust plate; the multiple compressor radial magnetic bearings are respectively mounted on both ends of the compressor shaft, the compressor radial magnetic bearing support end located at one end of the compressor shaft is aligned with the compressor bearing rotor, and the compressor radial magnetic bearing support end located at the other end of the compressor shaft is aligned with the magnetic inner rotor seat; the limit parts of the compressor axial magnetic bearing are respectively located at the axial ends of the compressor thrust plate; the compressor test body is fixedly arranged on the compressor shaft, the sensing end of the compressor sensor located at one end of the compressor shaft is aligned with the compressor test body, and the sensing end of the compressor sensor located at the other end of the compressor shaft is aligned with the inner rotor seat.

[0010] Preferably, the compressor magnetic bearing device is also provided with a protective bearing seat and a protective bearing, and the protective bearing seat is fixed on the compressor bearing seat; the outer ring of the protective bearing is interference fit with the protective bearing seat, and there is a gap between the inner ring of the protective bearing located at one end of the compressor shaft and the outer wall of the compressor shaft, and there is a gap between the inner ring of the protective bearing located at the other end of the compressor shaft and the outer wall of the magnetic inner rotor seat.

[0011] Preferably, the magnetic levitation motor includes a motor housing, a motor stator, a radial magnetic bearing and an axial magnetic bearing; the motor shaft is provided with a motor rotor, a radial bearing rotor and a thrust plate; the motor stator is fixedly embedded in the motor housing and aligned with the motor rotor; the radial magnetic bearing and the axial magnetic bearing are both fixed on the motor housing, the support end of the radial magnetic bearing is aligned with the radial bearing rotor, and the limit ends of the axial magnetic bearing are respectively located at the axial ends of the thrust plate.

[0012] Preferably, the plurality of impellers are divided into two-section impeller systems, each impeller system is provided with the same number of impellers, and the two impeller systems are arranged back to back.

[0013] Preferably, a sealing plate is provided between the two impeller systems, and the sealing plate is used to prevent gas in the impeller system with higher pressure in the two impeller systems from leaking to the impeller system with lower pressure.

[0014] Preferably, the diffuser plate includes a diffuser plate body, an inlet guide vane and a diffuser guide vane, and multiple diffuser plates are stacked in the axial direction, and the inlet guide vane of the previous diffuser plate is connected to the diffuser guide vane of the next diffuser plate; and multiple impellers are respectively located in the diffuser guide vanes at corresponding positions.

[0015] Preferably, a sealing block is provided between the inlet guide vane and the diffuser guide vane, and the sealing block is used to prevent the gas with higher pressure in the diffuser guide vane in the same diffuser plate from leaking into the inlet guide vane with lower pressure.

[0016] Preferably, the compressor casing is provided with a first air inlet, a first air outlet, a second air inlet and a second air outlet; the outside air is connected to the inlet guide vanes of the end diffuser plate in the first section impeller system through the first air inlet, one end of the first air outlet is connected to the diffuser guide vanes of the head diffuser plate in the first section impeller system, and the other end of the first air outlet is connected to one end of the second air inlet; the other end of the second air inlet is connected to the inlet guide vanes of the end diffuser plate in the second section impeller system, and the second air outlet is connected to the diffuser guide vanes of the head diffuser plate in the second section impeller system.

[0017] The advantages of the MCL compression system driven by a magnetic levitation motor connected to a magnetic coupling using the above technical solution of the present invention are:

[0018] During operation, the compressor's magnetic bearings drive the compressor shaft to levitate, and the magnetic levitation motor then rotates the motor shaft at high speed. The magnetic outer rotor rotates with the motor shaft and, through magnetic force, drives the magnetic inner rotor, which in turn rotates the compressor shaft. Gas enters the MCL compressor for compression, completing the operation. In this method, the MCL compressor and magnetic levitation motor are connected via a magnetic coupling, allowing for contactless torque transmission between the motor and compressor shafts. The magnetic bearings on both ends of the high-speed shaft system are independent systems. This eliminates the need for a speed increaser, reducing the number and size of equipment. Furthermore, the contactless torque transmission requires far less concentricity than traditional mechanical couplings. Furthermore, the MCL compressor's use of a magnetic bearing assembly increases the compressor shaft speed, reduces its size, and reduces energy consumption. Furthermore, the magnetic bearings do not require lubrication, reducing overall machine cost and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention.

[0020] Figure 2 、 Figure 3 Schematic diagram of the structure of the magnetic outer rotor.

[0021] Figure 4 、 Figure 5 Schematic diagram of the structure of the magnetic inner rotor.

[0022] Figure 6 Schematic diagram of the structure of the compressor shaft.

[0023] Figure 7 Schematic diagram of the structure of the diffuser plate.

[0024] Figure 8 Schematic diagram of the structure of the compressor casing.

[0025] 333-Balance plate. DETAILED DESCRIPTION

[0026] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0027] Example 1

[0028] like Figure 1-5The MCL compression system shown is connected to a magnetic levitation motor drive through a magnetic coupling, and the system includes a magnetic levitation motor 1, a magnetic coupling 2, and an MCL compressor 3; the magnetic levitation motor 1 is provided with a motor shaft 11, the magnetic coupling 2 is provided with a magnetic outer rotor 21 and a magnetic inner rotor 22, and the MCL compressor 3 is provided with a compressor shaft 33; the magnetic outer rotor 21 includes an outer rotor seat 211 and an outer rotor magnet 212; the outer rotor seat 211 is provided with an outer rotor magnet hole 213, a motor shaft matching hole 214, and an axial motor shaft screw hole 215; the outer rotor magnet 212 is fixed to the inner wall of the outer rotor magnet hole 213 , the motor shaft matching hole 214 cooperates with the outer wall of the motor shaft 11; the end face of the motor shaft 11 is provided with a threaded hole, the screw passes through the motor shaft screw hole 215 and is screwed with the threaded hole of the motor shaft 11; the magnetic inner rotor 22 includes an inner rotor seat 221 and an inner rotor magnet 222; the inner rotor magnet 222 is fixed to the outer wall of the inner rotor seat 221, and the inner rotor magnet 222 is aligned with the outer rotor magnet 212; the inner rotor seat 221 is provided with an axial compressor screw hole 223, and the end face of the compressor shaft 33 is provided with a threaded hole, the screw passes through the compressor screw hole 223 and is screwed with the threaded hole of the compressor shaft 33. During operation: 1) the compressor magnetic bearing assembly 34 drives the compressor shaft 33 to levitate, and the magnetic levitation motor 1 then operates, driving the motor shaft 11 to rotate at high speed; 2) the magnetic outer rotor 21 rotates along with the motor shaft 11 and, through magnetic force, drives the magnetic inner rotor 22 to rotate. This rotation of the magnetic inner rotor 22 also drives the compressor shaft 33; 3) gas enters the MCL compressor 3 for compression, completing the operation. In this method, the MCL compressor 3 is connected to the magnetic levitation motor 1 via a magnetic coupling 2. Torque is transmitted contactlessly between the motor shaft 11 and the compressor shaft 33, and the magnetic bearings on both ends of the high-speed shaft system are independent systems. This eliminates the need for a speed increaser, reducing the number and size of equipment. Furthermore, the contactless torque transmission requires far less concentricity than traditional mechanical couplings. Furthermore, the MCL compressor 3 is supported by the compressor magnetic bearing assembly 34, which increases the speed of the compressor shaft 33 while reducing its size and energy consumption. Furthermore, lubrication of the compressor magnetic bearing assembly 34 is unnecessary, reducing overall machine cost and maintenance.

[0029] The MCL compressor 3 is also provided with a compressor housing 31, multiple diffuser plates 32 and a compressor magnetic bearing device 34; the multiple diffuser plates 32 are fixed in the compressor housing 31, and the compressor shaft 33 is fixed with multiple impellers 35, and the multiple impellers 35 are respectively located in the multiple corresponding diffuser plates 32; the compressor magnetic bearing device 34 is sleeved on the compressor shaft 33 and is used to support and limit the compressor shaft 33 in the radial and axial directions.

[0030] The compressor magnetic bearing device 34 includes a compressor bearing seat 341, a compressor radial magnetic bearing 342, a compressor axial magnetic bearing 345, a compressor measured object 346 and multiple compressor sensors 347. The compressor shaft 33 is provided with a compressor bearing rotor and a compressor thrust plate 332; multiple compressor radial magnetic bearings 342 are respectively sleeved on both ends of the compressor shaft 33, the support end of the compressor radial magnetic bearing 342 located at one end of the compressor shaft 33 is aligned with the compressor bearing rotor, and the support end of the compressor radial magnetic bearing 342 located at the other end of the compressor shaft 33 is aligned with the magnetic inner rotor seat 221; the limit parts of the compressor axial magnetic bearing 345 are respectively located at the axial ends of the compressor thrust plate 332; the compressor measured object 346 is fixedly set on the compressor shaft 33, the sensing end of the compressor sensor 347 located at one end of the compressor shaft 33 is aligned with the compressor measured object 346, and the sensing end of the compressor sensor 347 located at the other end of the compressor shaft 33 is aligned with the inner rotor seat 221. The compressor radial magnetic bearings 342 at both ends of the compressor shaft 33 respectively drive the compressor bearing rotor and the magnetic inner rotor seat 221 to provide support for the compressor shaft 33 and make it suspended. The compressor axial magnetic bearings 345 drive the compressor thrust plate 332 to axially limit the compressor shaft 33.

[0031] The compressor magnetic bearing assembly 34 also includes a protective bearing seat 343 and a protective bearing 344. The protective bearing seat 343 is fixed to the compressor bearing seat 341. The outer ring of the protective bearing 344 has an interference fit with the protective bearing seat 343. A gap exists between the inner ring of the protective bearing 344 at one end of the compressor shaft 33 and the outer wall of the compressor shaft 33, and a gap exists between the inner ring of the protective bearing 344 at the other end of the compressor shaft 33 and the outer wall of the magnetic inner rotor seat 221. When the equipment suddenly loses power or shuts down, the compressor radial magnetic bearing 342 and the compressor axial magnetic bearing 345 lose their magnetic force and cannot support and limit the compressor shaft 33. At this time, the compressor shaft 33 falls and contacts the inner ring of the protective bearing 344, being supported by the protective bearing 344. This prevents the compressor shaft 33 from suddenly falling when the motor suddenly loses power or shuts down, causing damage to important components such as the compressor radial magnetic bearing 342 and the compressor axial magnetic bearing 345.

[0032] The magnetic levitation motor 1 includes a motor housing 12, a motor stator 13, a radial magnetic bearing 14, and an axial magnetic bearing 15. The motor shaft 11 is provided with a motor rotor 16, a radial bearing rotor 17, and a thrust plate 18. The motor stator 13 is fixedly embedded in the motor housing 12 and aligned with the motor rotor 16. The radial magnetic bearing 14 and the axial magnetic bearing 15 are both fixed to the motor housing 12, with the support end of the radial magnetic bearing 14 aligned with the radial bearing rotor 17, and the limiting ends of the axial magnetic bearing 15 located at the axial ends of the thrust plate 18. After the motor stator 13 drives the motor rotor 16 to rotate, the radial magnetic bearing 14 radially supports the motor shaft 11 by driving the radial bearing rotor 17, and the axial magnetic bearing 15 axially limits the motor shaft 11 by driving the thrust plate 18, thereby achieving radial and axial support and limiting of the motor shaft 11.

[0033] like Figure 6 As shown, the plurality of impellers 35 are divided into two sections of impeller systems. Each section of the impeller system is provided with the same number of impellers 35 , and the two sections of the impeller systems are arranged back to back to offset a large axial force.

[0034] like Figure 1 As shown, a sealing plate 4 is provided between the two impeller systems. The sealing plate 4 is used to prevent the gas in the impeller system with higher pressure in the two impeller systems from leaking to the impeller system with lower pressure.

[0035] like Figure 7 As shown, the diffuser plate 32 includes a diffuser plate body 321, inlet guide vanes 322, and diffuser guide vanes 323. Multiple diffuser plates 32 are stacked axially, and the inlet guide vanes 322 of the previous diffuser plate 32 are connected to the diffuser guide vanes 323 of the next diffuser plate 32. Multiple impellers 35 are located in the diffuser guide vanes 323 at corresponding positions. Gas enters through the inlet guide vanes 322 of the previous diffuser plate 32, and the subsequent impeller 35 compresses the gas before it is discharged through the diffuser guide vanes 323 of the current diffuser plate 32 to the inlet guide vanes 322 of the next diffuser plate 32, thereby compressing the gas. The inlet guide vanes 322 and diffuser guide vanes 323 function to rectify the flow and improve flow field efficiency.

[0036] A sealing block 324 is provided between the inlet guide vane 322 and the diffuser guide vane 323 . The sealing block 324 is used to prevent the gas with higher pressure in the diffuser guide vane 323 in the same diffuser plate 32 from leaking into the inlet guide vane 322 with lower pressure.

[0037] like Figure 8As shown, the compressor casing 31 is provided with a first air inlet 311, a first air outlet 312, a second air inlet 313 and a second air outlet 314; the outside air is connected to the inlet guide vane 322 of the end diffuser 32 in the first section impeller system through the first air inlet 311, one end of the first air outlet 312 is connected to the diffuser guide vane 323 of the head diffuser 32 in the first section impeller system, and the other end of the first air outlet 312 is connected to one end of the second air inlet 313; the other end of the second air inlet 313 is connected to the inlet guide vane 322 of the end diffuser 32 in the second section impeller system, and the second air outlet 314 is connected to the diffuser guide vane 323 of the head diffuser 32 in the second section impeller system. After the magnetic levitation motor 1 drives the MCL compressor 3 to rotate, the compressor shaft 33 rotates at high speed; the gas enters the inlet guide vane 322 of the end diffuser 32 in the first-stage impeller system from the first air inlet 311, and then the impeller 35 in the first-stage impeller system performs the first-stage multi-stage compression on it and discharges the compressed gas from the first air outlet 312; then the gas from the first air outlet 312 enters the second air inlet 313 and passes through the inlet guide vane 322 of the end diffuser 32 in the second-stage impeller system, and the impeller 35 in the second-stage impeller system performs the second-stage multi-stage compression on it and discharges the compressed gas from the second air outlet 314, thereby flowing out of the compressor.

Claims

1. An MCL compression system driven by a magnetic levitation motor connected to a magnetic coupling, characterized in that: The system comprises a magnetic levitation motor (1), a magnetic coupling (2) and an MCL compressor (3); the magnetic levitation motor (1) is provided with a motor shaft (11), the magnetic coupling (2) is provided with a magnetic outer rotor (21) and a magnetic inner rotor (22), and the MCL compressor (3) is provided with a compressor shaft (33); the magnetic outer rotor (21) comprises an outer rotor seat (211) and an outer rotor magnet (212); the outer rotor seat (211) is provided with an outer rotor magnet hole (213), a motor shaft matching hole (214) and an axial motor shaft screw hole (215); the outer rotor magnet (212) is fixed to the inner wall of the outer rotor magnet hole (213), and the motor shaft matching hole (214) is fixed to the inner wall of the outer rotor magnet hole (213). The outer wall of the motor shaft (11) is matched; the end face of the motor shaft (11) is provided with a threaded hole, the screw passes through the motor shaft screw hole (215) and is screwed with the threaded hole of the motor shaft (11); the magnetic inner rotor (22) includes an inner rotor seat (221) and an inner rotor magnet (222); the inner rotor magnet (222) is fixed to the outer wall of the inner rotor seat (221), and the inner rotor magnet (222) is aligned with the outer rotor magnet (212); the inner rotor seat (221) is provided with an axial compressor screw hole (223), the end face of the compressor shaft (33) is provided with a threaded hole, the screw passes through the compressor screw hole (223) and is screwed with the threaded hole of the compressor shaft (33); The MCL compressor (3) is further provided with a compressor housing (31), a plurality of pressure diffusers (32), and a compressor magnetic bearing device (34); the plurality of pressure diffusers (32) are fixed in the compressor housing (31), a plurality of impellers (35) are fixedly provided on the compressor shaft (33), and the plurality of impellers (35) are respectively located in the plurality of corresponding pressure diffusers (32); the compressor magnetic bearing device (34) is sleeved on the compressor shaft (33) and is used to support and limit the compressor shaft (33) in the radial and axial directions; The compressor magnetic bearing device (34) includes a compressor bearing seat (341), a compressor radial magnetic bearing (342), a compressor axial magnetic bearing (345), a compressor measured body (346) and a plurality of compressor sensors (347). The compressor shaft (33) is provided with a compressor bearing rotor and a compressor thrust plate (332); the plurality of compressor radial magnetic bearings (342) are respectively sleeved on both ends of the compressor shaft (33), the support end of the compressor radial magnetic bearing (342) located at one end of the compressor shaft (33) is aligned with the compressor bearing rotor, and the compressor radial magnetic bearing (342) located at the compressor shaft (33) is aligned with the compressor bearing rotor. 33) The support end of the compressor radial magnetic bearing (342) at the other end is aligned with the magnetic inner rotor seat (221); the limit parts of the compressor axial magnetic bearing (345) are respectively located at the axial ends of the compressor thrust plate (332); the compressor measured body (346) is fixedly arranged on the compressor shaft (33), the sensing end of the compressor sensor (347) located at one end of the compressor shaft (33) is aligned with the compressor measured body (346), and the sensing end of the compressor sensor (347) located at the other end of the compressor shaft (33) is aligned with the inner rotor seat (221); The compressor magnetic bearing device (34) is further provided with a protective bearing seat (343) and a protective bearing (344), wherein the protective bearing seat (343) is fixed on the compressor bearing seat (341); the outer ring of the protective bearing (344) is interference-fitted with the protective bearing seat (343); a gap exists between the inner ring of the protective bearing (344) located at one end of the compressor shaft (33) and the outer wall of the compressor shaft (33); and a gap exists between the inner ring of the protective bearing (344) located at the other end of the compressor shaft (33) and the outer wall of the magnetic inner rotor seat (221); The plurality of impellers (35) are divided into two impeller systems, each impeller system is provided with the same number of impellers (35), and the two impeller systems are arranged back to back; a sealing plate (4) is provided between the two impeller systems, and the sealing plate (4) is used to prevent gas in an impeller system with a higher pressure in the two impeller systems from leaking to an impeller system with a lower pressure.

2. The MCL compression system driven by a magnetic levitation motor connected to a magnetic coupling according to claim 1, characterized in that: The magnetic levitation motor (1) comprises a motor housing (12), a motor stator (13), a radial magnetic bearing (14) and an axial magnetic bearing (15); the motor shaft (11) is provided with a motor rotor (16), a radial bearing rotor (17) and a thrust plate (18); the motor stator (13) is fixedly embedded in the motor housing (12) and aligned with the motor rotor (16); the radial magnetic bearing (14) and the axial magnetic bearing (15) are both fixed on the motor housing (12), the support end of the radial magnetic bearing (14) is aligned with the radial bearing rotor (17), and the limit ends of the axial magnetic bearing (15) are respectively located at the axial ends of the thrust plate (18).

3. The MCL compression system driven by a magnetic levitation motor connected to a magnetic coupling according to claim 1, characterized in that: The diffuser plate (32) includes a diffuser plate body (321), an inlet guide vane (322) and a diffuser guide vane (323). The plurality of diffuser plates (32) are stacked in the axial direction, and the inlet guide vane (322) of the preceding diffuser plate (32) is connected to the diffuser guide vane (323) of the following diffuser plate (32). The plurality of impellers (35) are respectively located in the diffuser guide vanes (323) at corresponding positions.

4. The MCL compression system driven by a magnetic levitation motor connected to a magnetic coupling according to claim 3, characterized in that: A sealing block (324) is provided between the inlet guide vane (322) and the diffuser guide vane (323), and the sealing block (324) is used to prevent gas with a higher pressure in the diffuser guide vane (323) in the same diffuser plate (32) from leaking into the inlet guide vane (322) with a lower pressure.

5. The MCL compression system driven by a magnetic levitation motor connected to a magnetic coupling according to claim 3, characterized in that: The compressor housing (31) is provided with a first air inlet (311), a first air outlet (312), a second air inlet (313) and a second air outlet (314); external air is communicated with the inlet guide vane (322) of the end diffuser (32) in the first section impeller system through the first air inlet (311); one end of the first air outlet (312) is communicated with the diffuser guide vane (323) of the head diffuser (32) in the first section impeller system, and the other end of the first air outlet (312) is communicated with one end of the second air inlet (313); the other end of the second air inlet (313) is communicated with the inlet guide vane (322) of the end diffuser (32) in the second section impeller system, and the second air outlet (314) is communicated with the diffuser guide vane (323) of the head diffuser (32) in the second section impeller system.

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