A super-high-speed magnetic levitation air compressor for fuel cells

Abstract

The present invention relates to the technical field of fuel cell applications, and discloses a super-high-speed magnetic levitation air compressor for fuel cells, which includes a housing and a power assembly. The power assembly is located inside the housing. An air inlet end for compressing gas and an expansion end for utilizing waste gas are respectively provided on both sides of the housing. A clamping frame, an integrated bearing seat, a first fixing member, a second fixing member, an installation ring, a third fixing member, a radial magnetic bearing seat and a connecting frame are sequentially fixed to the circumferential inner wall of the housing from left to right by bolts. The installation ring is located at the center of the housing, and a plurality of uniformly distributed stators are bonded to the circumferential inner wall of the installation ring. Detection mechanisms for detecting the rotational position of the power assembly are provided between the clamping frame and the integrated bearing seat and between the radial magnetic bearing seat and the connecting frame. The present invention can, through the coaxial arrangement of the compression wheel and the expansion wheel, enable the discharged waste gas to do work on the expansion wheel, recover the energy of the gas flow in the waste gas, reduce the compression power consumption, and achieve higher efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel cell applications, and particularly to a super-high-speed magnetic levitation air compressor for fuel cells. Background Art

[0002] A fuel cell is a chemical device that directly converts the chemical energy of a fuel into electrical energy, also known as an electrochemical generator. It is the fourth power generation technology after hydraulic power generation, thermal power generation, and nuclear power generation. When applied to new energy vehicles, it is used in combination with an air compressor.

[0003] Currently, air compressors on the market have adopted hydrodynamic or hydrostatic gas bearings to solve the energy loss caused by friction between bearings. However, hydrodynamic gas bearings have problems such as wear caused by low load capacity at low speeds and insufficient thrust bearing to balance axial forces; hydrostatic gas bearings require a separate air supply system, and the structure is relatively complex. Summary of the Invention

[0004] (1) Technical Problems to be Solved

[0005] In view of the deficiencies of the prior art, the present invention provides a super-high-speed magnetic levitation air compressor for fuel cells, mainly to solve the problem of high energy consumption of air compressors that use a direct drive method of an electric motor to drive the flow of gas.

[0006] (2) Technical Solutions

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A super-high-speed magnetic levitation air compressor for fuel cells includes a housing and a power assembly. The power assembly is located inside the housing. An air inlet end for compressing gas and an expansion end for utilizing waste gas are respectively provided on both sides of the housing. A bracket, an integrated bearing seat, a first fixing member, a second fixing member, an installation ring, a third fixing member, a radial magnetic bearing seat, and a connecting frame are sequentially fixed to the circumferential inner wall of the housing from left to right by bolts. The installation ring is located at the center of the housing. The motor stator and the annular winding are bonded to the circumferential inner wall of the installation ring, and the annular winding is in contact with the motor stator. Detection mechanisms for detecting the rotational position of the power assembly are provided between the second fixing member and the bracket and between the radial magnetic bearing seat and the connecting frame. An axial magnetic bearing is fixedly connected between the two first fixing members. A second radial magnetic bearing is bonded between the third fixing member and the radial magnetic bearing seat, and they are fixed by bolts between the third fixing member and the radial magnetic bearing seat. A first radial magnetic bearing is provided between the second fixing member and the integrated bearing seat. Compression wheels and expansion wheels are respectively provided at both ends of the power assembly. The compression wheels are located inside the air inlet end, and the expansion wheels are located inside the expansion end.

[0009] Further, the intake end includes a diffuser which is fixed to one side of the housing by bolts. The compression wheel is located within the diffuser, and the compression wheel and the diffuser can be used in cooperation with each other.

[0010] Further, the expansion end includes a guide which is fixed to the other side of the housing by bolts. The expansion wheel is located within the guide, and the expansion wheel and the guide can be used in cooperation with each other.

[0011] Further, the detection mechanism includes a first sensor bracket and a second sensor bracket. The first sensor bracket is bonded between the clamping bracket and the integrated bearing seat, and the clamping bracket and the integrated bearing seat are fixed by bolts. The second sensor bracket is bonded between the radial magnetic bearing seat and the connecting frame, and the radial magnetic bearing seat and the connecting frame are fixed by bolts. A plurality of avoidance grooves are provided on the circumferential outer walls of the first sensor bracket and the second sensor bracket, and a plurality of placement grooves with the same number as the avoidance grooves are provided on the circumferential inner walls. The avoidance grooves and the placement grooves are communicated with each other. A displacement sensor is provided in each of the plurality of placement grooves.

[0012] Further, the power assembly includes a first connecting shaft, a thrust disc, a sheath, a motor rotor and a second connecting shaft. The sheath is sleeved on the circumferential outer side of the motor rotor. The first connecting shaft and the second connecting shaft are respectively press-fitted and inserted on both sides of the sheath. The thrust disc is fixedly connected to the circumferential outer wall of the first connecting shaft, and the thrust disc is located within the axial magnetic bearing. Displacement detection rings and radial magnetic bearing rotors are provided on the circumferential outer walls of the first connecting shaft and the second connecting shaft, and the displacement detection rings and the radial magnetic bearing rotors on the first connecting shaft and the second connecting shaft are axially symmetrically distributed. The displacement detection rings and the displacement sensors are used in cooperation with each other, and the radial magnetic bearing rotors and the two radial magnetic bearings are used in cooperation with each other.

[0013] Further, the axial magnetic bearing seat includes two axial magnetic bearing stators. Installation grooves are provided on the opposite surfaces of the two axial magnetic bearing stators, and axial magnetic bearing coils are bonded in the installation grooves.

[0014] Further, both the first radial magnetic bearing and the second radial magnetic bearing include an annular seat. A plurality of uniformly distributed radial magnetic bearing stators are integrally formed on the circumferential inner wall of the annular seat, and radial magnetic bearing coils are wound around the peripheries of the radial magnetic bearing stators.

[0015] On the basis of the foregoing solution, two first through holes for connecting external wires to the first radial magnetic bearing and the second radial magnetic bearing are provided on one side of the housing, and two second through holes for connecting external wires to the displacement sensors are provided on the same side of the housing.

[0016] As a further solution of the present invention, the circumferential outer wall of the shell is provided with a plurality of square heat dissipation holes and a plurality of circular air holes, the circumferential outer wall of the mounting ring is provided with a bolt-shaped cooling water channel, and two connecting water pipes are provided on one side of the shell, and the two connecting water pipes are respectively connected to the two ends of the cooling water channel.

[0017] As a further solution of the present invention, a mounting seat is fixed to one side of the shell by bolts, and protective bearings are sleeved on the circumferential inner walls of the clamping frame and the connecting frame.

[0018] (III) Beneficial effects

[0019] Compared with the prior art, the present invention provides an ultra-high-speed magnetic levitation air compressor for a fuel cell, which has the following beneficial effects:

[0020] 1. The present invention arranges the compression wheel and the expansion wheel coaxially so that the exhausted exhaust gas performs work on the expansion wheel, recovers the energy of the gas flow in the exhaust gas, reduces the compression power consumption, and achieves higher efficiency.

[0021] 2. The present invention can be actively controlled by setting radial magnetic bearings and axial magnetic bearings, without contact or friction, and ensures that the compressed gas is clean and oil-free. At the same time, it can minimize the friction between the power component and the housing to the greatest extent, thereby minimizing the energy loss.

[0022] 3. The present invention cools the air compressor by means of natural air cooling plus water cooling through the arrangement of heat dissipation holes, air vents and cooling water channels, thereby improving the cooling effect of the air compressor and further increasing the service life of the air compressor.

[0023] 4. The present invention protects the power assembly when the power is off by setting a protective bearing, thereby preventing the power assembly from being damaged by excessive shaking during rotation after the power is off, thereby increasing the service life of the air compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the three-dimensional structure of an ultra-high-speed magnetic levitation air compressor for a fuel cell proposed by the present invention;

[0025] Figure 2 This is a schematic diagram of the overall exploded structure of an ultra-high-speed magnetic levitation air compressor for a fuel cell proposed by the present invention;

[0026] Figure 3 This is a schematic diagram of the cross-sectional structure of a shell of an ultra-high-speed magnetic levitation air compressor for a fuel cell proposed by the present invention;

[0027] Figure 4 This is a partial cross-sectional structural schematic diagram of an ultra-high-speed magnetic levitation air compressor for a fuel cell proposed by the present invention;

[0028] Figure 5 Schematic diagram of the enlarged structure of the power component of a super-high-speed magnetic levitation air compressor for fuel cells proposed by the present invention

[0029] Figure 6 Exploded structure schematic diagram of the power component of a super-high-speed magnetic levitation air compressor for fuel cells proposed by the present invention

[0030] Figure 7 Schematic diagram of the enlarged structure of the radial magnetic bearing of a super-high-speed magnetic levitation air compressor for fuel cells proposed by the present invention

[0031] Figure 8 Cross-sectional structure schematic diagram of the axial magnetic bearing of a super-high-speed magnetic levitation air compressor for fuel cells proposed by the present invention

[0032] Figure 9 Schematic diagram of the enlarged structure of the sensor bracket of a super-high-speed magnetic levitation air compressor for fuel cells proposed by the present invention.

[0033] In the figure: 1. Housing; 2. Guide; 3. Heat dissipation holes; 4. Connecting water pipe; 5. Mounting seat; 6. First through hole; 7. Second through hole; 8. Diffuser; 9. Ring winding; 10. Bracket; 11. Integrated bearing seat; 12. Fixing part one; 13. Fixing part two; 14. Fixing part three; 15. Radial magnetic bearing seat; 16. Connecting frame; 17. Compression wheel; 18. Protection bearing; 19. First sensor bracket; 20. First radial magnetic bearing; 21. Axial magnetic bearing; 22. Power component; 23. Second radial magnetic bearing; 24. Second sensor bracket; 25. Expansion wheel; 26. Mounting ring; 27. Cooling water channel; 28. Motor stator; 29. First connecting shaft; 30. Thrust disk; 31. Sheath; 32. Second connecting shaft; 33. Radial magnetic bearing coil; 34. Radial magnetic bearing stator; 35. Axial magnetic bearing stator; 36. Mounting groove; 37. Axial magnetic bearing coil; 38. Placing groove; 39. Displacement sensor; 40. Avoidance groove; 41. Motor rotor; 42. Radial magnetic bearing rotor; 43. Displacement detection ring. Specific embodiments

[0034] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0035] Refer to Figures 1-9, A super-high-speed magnetic levitation air compressor for fuel cells, comprising a housing 1 and a power assembly 22. The power assembly 22 is located inside the housing 1. An air inlet end for compressing gas and an expansion end for utilizing waste gas are respectively provided on both sides of the housing 1. A bracket 10, an integrated bearing seat 11, a first fixing member 12, a second fixing member 13, a mounting ring 26, a third fixing member 14, a radial magnetic bearing seat 15 and a connecting frame 16 are sequentially fixed to the circumferential inner wall of the housing 1 from left to right by bolts. And the power assembly passes through the bracket 10, the integrated bearing seat 11, the first fixing member 12, the second fixing member 13, the mounting ring 26, the third fixing member 14, the radial magnetic bearing seat 15 and the connecting frame 16. Among them, the mounting ring 26 is located at the central part of the housing 1. The motor stator 28 and the annular winding 9 are bonded to the circumferential inner wall of the mounting ring 26, and the annular winding 9 is in contact with the motor stator 28, shortening the axial length of the motor stator 28. The end length is greatly shortened compared with the double-layer distributed short-pitch winding, so that the axially occupied space is also correspondingly shortened. And an annular winding design is adopted, thereby increasing the critical speed. Compared with the double-layer distributed short-pitch winding, the end length of the annular winding 9 is further reduced, making the space occupied by the motor axially smaller, and greatly increasing the critical speed of the rotor system. The motor stator 28 and the power assembly 22 are used in cooperation to make the power assembly 22 rotate in the energized state. Detection mechanisms for detecting the rotation position of the power assembly 22 are provided between the second fixing member 13 and the bracket 10 and between the radial magnetic bearing seat 15 and the connecting frame 16. An axial magnetic bearing 21 is fixedly connected between the two first fixing members 12. A second radial magnetic bearing 23 is bonded between the third fixing member 14 and the radial magnetic bearing seat 15, and the third fixing member 14 and the radial magnetic bearing seat 15 are fixed by bolts. A first radial magnetic bearing 20 is provided between the second fixing member 13 and the integrated bearing seat 11. Compression wheels 17 and expansion wheels 25 are respectively provided at both ends of the power assembly 22. The compression wheel 17 is located inside the air inlet end, and the expansion wheel 25 is located inside the expansion end. The compression and expansion ends are distributed on opposite sides, which can balance the axial force and greatly reduce the force on the thrust bearing. By energizing the first radial magnetic bearing 20, the second radial magnetic bearing 23 and the axial magnetic bearing 21, the power assembly 22 is supported, enabling the power assembly 22 to rotate stably. By energizing the power assembly 22, the power assembly 22 rotates, thereby driving the compression wheels 17 and the expansion wheels 25 to rotate. Then, air is compressed from the air inlet end, passes through the intercooler and enters the fuel cell stack for reaction. The exhausted waste gas will enter the expansion end, thereby making the expansion wheel 25 rotate further, recovering the energy of the gas flow in the waste gas, reducing the compression power consumption, and achieving higher efficiency.

[0036] Among them, the air inlet end includes a diffuser 8. The diffuser 8 is fixed to one side of the housing 1 by bolts. And the compression wheel 17 is located inside the diffuser 8, and the compression wheel 17 and the diffuser 8 can be used in cooperation. The rotating compression wheel 17 compresses air inside the diffuser 8 and at the same time discharges it from the other end of the diffuser 8, compressing the air and increasing the air intake of the fuel cell stack.

[0037] Among them, the expansion end includes a guide 2, which is fixed to the other side of the housing 1 by bolts. An expansion wheel 25 is located inside the guide 2 and can cooperate with the guide 2. The exhausted waste gas will drive the expansion wheel 25 to rotate further under the action of the guide 2, making the rotation speed of the compression wheel 17 faster, and further increasing the intake air volume of the fuel cell stack.

[0038] Among them, the detection mechanism includes a first sensor bracket 19 and a second sensor bracket 24. The first sensor bracket 19 is bonded between the bracket 10 and the integrated bearing seat 11, and the bracket 10 and the integrated bearing seat 11 are fixed by bolts. The second sensor bracket 24 is bonded between the radial magnetic bearing seat 15 and the connecting frame 16, and the radial magnetic bearing seat 15 and the connecting frame 16 are fixed by bolts. A plurality of avoidance grooves 40 are provided on the circumferential outer walls of the first sensor bracket 19 and the second sensor bracket 24, and a plurality of placement grooves 38 with the same number as the avoidance grooves 40 are provided on the circumferential inner walls. The avoidance grooves 40 communicate with the placement grooves 38. A displacement sensor 39 is provided in each of the plurality of placement grooves 38. The displacement sensor 39 is preferably an eddy current sensor in the form of a PCB. During the rotation of the power assembly 22, the power assembly 22 is monitored in real time, and the imbalance magnitude can be evaluated online and the imbalance can be actively controlled, so that the control of the system reaches a very high precision.

[0039] Among them, the power assembly 22 includes a first connecting shaft 29, a thrust disk 30, a sheath 31, a motor rotor 41 and a second connecting shaft 32. The motor rotor 41 is a solid samarium-cobalt permanent magnet. The sheath 31 is sleeved on the circumferential outer side of the motor rotor 41. The first connecting shaft 29 and the second connecting shaft 32 are respectively press-fitted and inserted on both sides of the sheath 31, and the first connecting shaft 29 and the second connecting shaft 32 are respectively fixed to the compression wheel 17 and the expansion wheel 25. The thrust disk 30 is welded on the circumferential outer wall of the first connecting shaft 29, and the thrust disk 30 is located inside the axial magnetic bearing 21. Displacement detection rings 43 and radial magnetic bearing rotors 42 are provided on the circumferential outer walls of the first connecting shaft 29 and the second connecting shaft 32, and the displacement detection rings 43 and the radial magnetic bearing rotors 42 on the first connecting shaft 29 and the second connecting shaft 32 are axially symmetrically distributed. The displacement detection ring 43 and the displacement sensor 39 are used in cooperation, and the radial magnetic bearing rotor 42 and the two radial magnetic bearings are used in cooperation. The displacement detection ring 43 is used for the displacement sensor 39 to detect its radial and axial displacements. If there is an offset, the displacement sensor 39 detects it and feeds it back to the magnetic bearing controller. The magnetic bearing controller adjusts the magnitude of the electromagnetic force by changing the control current applied in the coil winding to achieve active control of the rotor position and the bearing stiffness and damping. The power assembly 22 adopts a three-section combination, which is convenient for the maintenance and installation of the sheath 31.

[0040] Among them, the axial magnetic bearing seat 21 includes two axial magnetic bearing stators 35, and the opposite surfaces of the two axial magnetic bearing stators 35 are provided with installation grooves 36, and axial magnetic bearing coils 37 are bonded in the installation grooves 36. The thrust plate 30 is located between the two axial magnetic bearing coils 37. After power is supplied, the axial magnetic bearing coils 37 can limit the thrust plate 30, thereby limiting the axial displacement of the power component 22.

[0041] Among them, the first radial magnetic bearing 20 and the second radial magnetic bearing 23 both include an annular seat, and a plurality of evenly distributed radial magnetic bearing stators 34 are integrally formed on the circumferential inner wall of the annular seat. The plurality of radial magnetic bearing stators 34 are octapole distributed, and radial magnetic bearing coils 33 are wound around the radial magnetic bearing stators 34. The first connecting shaft 29 and the second connecting shaft 32 pass through the first radial magnetic bearing 20 and the second radial magnetic bearing 23 respectively, thereby limiting the radial freedom of the power component 22.

[0042] Among them, two first through holes 6 for connecting external wires to the first radial magnetic bearing 20 and the second radial magnetic bearing 23 are opened on one side of the shell 1, and two second through holes 7 for connecting the external wires to the displacement sensor 39 are opened on the same side of the shell 1. The radial magnetic bearing coil 33 on the magnetic bearing is energized to generate magnetic force to support the power component 22.

[0043] Among them, the circumferential outer wall of the shell 1 is provided with a plurality of square heat dissipation holes 3 and a plurality of circular air holes, and the heat dissipation holes 3 are not connected to the space where the air holes 22 and the sleeve 31 are located. The circumferential outer wall of the mounting ring 26 is provided with a bolt-shaped cooling water channel 27. Two connecting water pipes 4 are provided on one side of the shell 1, and the two connecting water pipes 4 are respectively connected to the two ends of the cooling water channel 27. The air compressor is cooled by natural air cooling and water cooling to improve the cooling effect of the air compressor.

[0044] Among them, a mounting seat 5 is fixed on one side of the shell 1 by bolts for installing the controller. The circumferential inner walls of the bracket 10 and the connecting frame 16 are sleeved with protective bearings 18. Both ends of the power component 22 pass through the protective bearings 18 and contact with the protective bearings 18. When the power is off, the power component 22 is protected to avoid damage caused by excessive shaking during rotation after the power is off, thereby improving the service life of the air compressor.

[0045] Working principle of this embodiment: During use, power is supplied to the first radial magnetic bearing 20, the second radial magnetic bearing 23, and the axial magnetic bearing 21. The magnetic force generated by the energized axial magnetic bearing 21 can limit the thrust disk 30, thereby restricting the axial displacement of the power assembly 22. The magnetic forces generated by the energized first radial magnetic bearing 20 and the second radial magnetic bearing 23 can restrict the radial degrees of freedom of the power assembly 22, enabling the power assembly 22 to rotate stably. At the same time, the friction between the power assembly 22 and the housing 1 can be minimized to the greatest extent, minimizing energy loss. Power is supplied to the power assembly 22, and the power assembly 22 rotates, thereby driving the compression wheel 17 and the expansion wheel 25 to rotate. As a result, air is compressed from the intake end, passes through the intercooler, and enters the fuel cell stack for reaction. The exhausted waste gas enters the expansion end, causing the expansion wheel 25 to rotate further, recovering the energy of the gas flow in the waste gas, reducing the compression power consumption, and achieving higher efficiency.

[0046] All electrical components appearing in this article are connected to an external main controller and a 470V DC bus voltage, and the main controller can be a conventional known device such as a computer for control.

[0047] In the description of this article, it should be noted that unless otherwise clearly specified and limited, the terms "connected" and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection, and it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] In the description of this article, it should be noted that relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variation thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0049] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An ultra-high-speed magnetic levitation air compressor for a fuel cell, comprising a housing (1) and a power assembly (22), wherein the power assembly (22) is located inside the housing (1), and is characterized in that: The shell (1) is provided with an air intake end for compressing gas and an expansion end for utilizing exhaust gas on both sides, respectively. The circumferential inner wall of the shell (1) is fixedly connected with a bracket (10), a second fixing member (13), an integrated bearing seat (11), a mounting ring (26), a third fixing member (14), a radial magnetic bearing seat (15) and a connecting frame (16) in sequence from left to right. The circumferential inner wall of the integrated bearing seat (11) is fixedly connected with two first fixing members (12). The mounting ring (26) is located at the center of the shell (1). The circumferential inner wall of the mounting ring (26) is fixedly connected with a motor stator (28) and an annular winding (9), and the annular winding (9) is in contact with the motor stator (28). The second fixing member (13) and the bracket (1 0) and between the radial magnetic bearing seat (15) and the connecting frame (16), a detection mechanism for detecting the rotation position of the power assembly (22) is provided, an axial magnetic bearing (21) is fixedly connected between the two fixing members (12), a second radial magnetic bearing (23) is fixedly connected between the fixing member (14) and the radial magnetic bearing seat (15), and the fixing member (14) and the radial magnetic bearing seat (15) are fixedly connected, a first radial magnetic bearing (20) is provided between the fixing member (13) and the integrated bearing seat (11), and a compression wheel (17) and an expansion wheel (25) are provided at both ends of the power assembly (22), the compression wheel (17) is located in the air intake end, and the expansion wheel (25) is located in the expansion end; The detection mechanism comprises a first sensor bracket (19) and a second sensor bracket (24), the first sensor bracket (19) being fixedly connected between the card bracket (10) and the integrated bearing seat (11), and the card bracket (10) and the integrated bearing seat (11) being fixedly connected, the second sensor bracket (24) being fixedly connected between the radial magnetic bearing seat (15) and the connecting frame (16), and the radial magnetic bearing seat (15) and the connecting frame (16) being fixedly connected, the circumferential outer walls of the first sensor bracket (19) and the second sensor bracket (24) being provided with a plurality of avoidance grooves (40), the circumferential inner walls being provided with placement grooves (38) of the same number as the avoidance grooves (40), and the avoidance grooves (40) being connected to the placement grooves (38), and the plurality of placement grooves (38) being provided with displacement sensors (39); The power assembly (22) comprises a first connecting shaft (29), a thrust plate (30), a sleeve (31), a motor rotor (41) and a second connecting shaft (32), wherein the sleeve (31) is sleeved on the outer circumference of the motor rotor (41), the first connecting shaft (29) and the second connecting shaft (32) are respectively plugged into the two sides of the sleeve (31) by interference fit, the thrust plate (30) is fixedly connected to the outer circumference of the first connecting shaft (29), and the thrust plate (30) is located in the axial magnetic bearing (21), and the outer circumferences of the first connecting shaft (29) and the second connecting shaft (32) are both provided with a displacement detection ring (43) and a radial magnetic bearing rotor (42), and the displacement detection ring (43) and the radial magnetic bearing rotor (42) of the first connecting shaft (29) and the second connecting shaft (32) are axially symmetrically distributed, and the displacement detection ring (43) and the displacement sensor (39) are used in combination, and the radial magnetic bearing rotor (42) and the two radial magnetic bearings are used in combination; The first radial magnetic bearing (20) and the second radial magnetic bearing (23) both comprise an annular seat, a plurality of evenly distributed radial magnetic bearing stators (34) are integrally formed on the circumferential inner wall of the annular seat, and radial magnetic bearing coils (33) are wound around the radial magnetic bearing stators (34).

2. The ultra-high-speed magnetic levitation air compressor for fuel cells according to claim 1, characterized in that: The air inlet end comprises a diffuser (8), the diffuser (8) is fixedly connected to one side of the housing (1), and the compression wheel (17) is located inside the diffuser (8), and the compression wheel (17) and the diffuser (8) can be used in conjunction with each other.

3. The ultra-high-speed magnetic levitation air compressor for fuel cells according to claim 1, characterized in that: The expansion end comprises a guide (2), the guide (2) being fixedly connected to the other side of the housing (1), and the expansion wheel (25) being located inside the guide (2), and the expansion wheel (25) and the guide (2) being able to cooperate in use.

4. The ultra-high-speed magnetic levitation air compressor for fuel cells according to claim 1, characterized in that: The axial magnetic bearing (21) comprises two axial magnetic bearing stators (35), and mounting grooves (36) are provided on opposite surfaces of the two axial magnetic bearing stators (35), and axial magnetic bearing coils (37) are fixedly connected in the mounting grooves (36).

5. The ultra-high-speed magnetic levitation air compressor for fuel cells according to claim 1, characterized in that: Two first through holes (6) for connecting external wires to the first radial magnetic bearing (20) and the second radial magnetic bearing (23) are provided on one side of the housing (1), and two second through holes (7) for connecting the external wires to the displacement sensor (39) are provided on the same side of the housing (1).

6. The ultra-high-speed magnetic levitation air compressor for fuel cells according to claim 1, characterized in that: The circumferential outer wall of the shell (1) is provided with a plurality of square heat dissipation holes (3) and a plurality of circular air holes, the circumferential outer wall of the mounting ring (26) is provided with a bolt-shaped cooling water channel (27), and two connecting water pipes (4) are provided on one side of the shell (1), and the two connecting water pipes (4) are respectively connected to the two ends of the cooling water channel (27).

7. The ultra-high-speed magnetic levitation air compressor for fuel cells according to claim 1, characterized in that: A mounting seat (5) is fixedly connected to one side of the housing (1), and protective bearings (18) are sleeved on the circumferential inner walls of the clamping frame (10) and the connecting frame (16).

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