Ultrahigh-speed magnetic suspension air compressor for fuel cell

Abstract

The invention relates to the technical field of fuel cell application, and discloses a superspeed magnetic suspension air compressor for a fuel cell, the superspeed magnetic suspension air compressor for the fuel cell comprises a shell and a power assembly, the power assembly is located in the shell, two sides of the shell are respectively provided with a gas inlet end for compressing gas and an expansion end for utilizing waste gas, and the expansion end is located in the shell. A clamping frame, an integrated bearing seat, a first fixing piece, a second fixing piece, a mounting ring, a third fixing piece, a radial magnetic bearing seat and a connecting frame are sequentially fixed to the circumferential inner wall of the shell from left to right through bolts, the mounting ring is located in the center of the shell, and a plurality of evenly-distributed stators are bonded to the circumferential inner wall of the mounting ring. Detection mechanisms used for detecting the rotating position of the power assembly are arranged between the clamping frame and the integrated bearing seat and between the radial magnetic bearing seat and the connecting frame correspondingly. Through coaxial arrangement of the compression wheel and the expansion wheel, exhausted waste gas acts on the expansion wheel, energy of gas flowing in the waste gas is recycled, the compression power consumption is reduced, and the compression efficiency is improved. And higher efficiency is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel cell applications, in particular to an ultra-high-speed magnetic suspension air compressor for fuel cells. Background Art

[0002] A fuel cell is a chemical device that converts the chemical energy of fuel directly into electrical energy. It is also called an electrochemical generator. It is the fourth power generation technology after hydropower, thermal power generation and atomic power generation. When used in new energy vehicles, it will be equipped with an air compressor in combination.

[0003] At present, air compressors on the market have adopted dynamic pressure or static pressure gas bearings to solve the energy loss caused by friction between bearings. However, dynamic pressure gas bearings have problems of wear caused by low load-bearing capacity at low speeds and insufficient axial force balance of thrust bearings; static pressure gas bearings require a separate air supply system and have a more complicated structure. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the deficiencies in the prior art, the present invention provides an ultra-high-speed magnetic levitation air compressor for a fuel cell, which is mainly used to solve the problem of high energy consumption of air compressors that use a motor to directly drive the flow of gas.

[0006] (II) Technical solution

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

[0008] An ultra-high-speed magnetic levitation air compressor for a fuel cell comprises a shell and a power assembly, wherein the power assembly is located inside the shell, and an air intake end for compressing gas and an expansion end for utilizing exhaust gas are respectively provided on both sides of the shell, and a bracket, an integrated bearing seat, a fixing part 1, a fixing part 2, a mounting ring, a fixing part 3, a radial magnetic bearing seat and a connecting frame are fixed to the circumferential inner wall of the shell by bolts from left to right in sequence, wherein the mounting ring is located in the center of the shell, and a motor stator and an annular winding are bonded to the circumferential inner wall of the mounting ring, and the annular winding is mutually connected with the motor stator. Contact, a detection mechanism for detecting the rotation position of the power component is provided between the fixing part 2 and the bracket and between the radial magnetic bearing seat and the connecting frame, an axial magnetic bearing is fixedly connected between the two fixing parts 1, a second radial magnetic bearing is bonded between the fixing part 3 and the radial magnetic bearing seat, and the fixing part 3 and the radial magnetic bearing seat are fixed by bolts, a first radial magnetic bearing is provided between the fixing part 2 and the integrated bearing seat, and a compression wheel and an expansion wheel are respectively provided at both ends of the power component, the compression wheel is located in the air intake end, and the expansion wheel is located in the expansion end.

[0009] Furthermore, the air inlet end includes a diffuser, which is fixed to one side of the shell by bolts, and the compression wheel is located in the diffuser, and the compression wheel and the diffuser can be used in conjunction with each other.

[0010] Furthermore, the expansion end includes a guide, which is fixed to the other side of the shell by bolts, and the expansion wheel is located in the guide, and the expansion wheel and the guide can be used in conjunction with each other.

[0011] Furthermore, the detection mechanism includes a first sensor bracket and a second sensor bracket, the first sensor bracket is bonded between the bracket and the integrated bearing seat, and the 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, the circumferential outer walls of the first sensor bracket and the second sensor bracket are each provided with a plurality of avoidance grooves, the circumferential inner walls are each provided with the same number of placement grooves as the avoidance grooves, and the avoidance grooves are connected to the placement grooves, and displacement sensors are each provided in the plurality of placement grooves.

[0012] Furthermore, the power assembly includes a first connecting shaft, a thrust plate, a sleeve, a motor rotor and a second connecting shaft, wherein the sleeve is sleeved on the circumferential outer side of the motor rotor, the first connecting shaft and the second connecting shaft are respectively interference fit and inserted on both sides of the sleeve, the thrust plate is fixedly connected to the circumferential outer wall of the first connecting shaft, and the thrust plate is located in the axial magnetic bearing, the circumferential outer walls of the first connecting shaft and the second connecting shaft are both provided with displacement detection rings and radial magnetic bearing rotors, and the displacement detection rings and radial magnetic bearing rotors of the first connecting shaft and the second connecting shaft are axially symmetrically distributed, and the displacement detection ring and the displacement sensor are used in combination, and the radial magnetic bearing rotor and the two radial magnetic bearings are used in combination.

[0013] Furthermore, the axial magnetic bearing seat includes two axial magnetic bearing stators, and the opposite surfaces of the two axial magnetic bearing stators are provided with mounting grooves, and the axial magnetic bearing coils are bonded in the mounting grooves.

[0014] Furthermore, the first radial magnetic bearing and the second radial magnetic bearing both include an annular seat, a plurality of evenly 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 radial magnetic bearing stators.

[0015] Based on the above scheme, two first through holes for connecting external wires to the first radial magnetic bearing and the second radial magnetic bearing are opened on one side of the shell, and two second through holes for connecting external wires to the displacement sensor are opened on the same side of the shell.

[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 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 This is a schematic diagram of the enlarged structure of the power assembly of an ultra-high-speed magnetic levitation air compressor for a fuel cell proposed by the present invention.

[0029] Figure 6 Schematic diagram of the decomposed structure of the power assembly of an ultra-high-speed magnetic levitation air compressor for fuel cells proposed by the present invention

[0030] Figure 7 A schematic diagram of the enlarged structure of the radial magnetic bearing of an ultra-high-speed magnetic levitation air compressor for a fuel cell proposed by the present invention

[0031] Figure 8 A schematic cross-sectional view of the axial magnetic bearing of an ultra-high-speed magnetic levitation air compressor for a fuel cell proposed by the present invention

[0032] Fig. 9 This is a schematic diagram of the enlarged structure of a sensor bracket for an ultra-high-speed magnetic levitation air compressor for a fuel cell proposed by the present invention.

[0033] In the figure: 1, shell; 2, guide; 3, heat dissipation hole; 4, connecting water pipe; 5, mounting seat; 6, first through hole; 7, second through hole; 8, diffuser; 9, annular winding; 10, bracket; 11, integrated bearing seat; 12, fixing part 1; 13, fixing part 2; 14, fixing part 3; 15, radial magnetic bearing seat; 16, connecting frame; 17, compression wheel; 18, protective bearing; 19, first sensor bracket; 20, first radial magnetic bearing; 21, axial magnetic bearing; 22, power assembly; 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 plate; 31. Sleeve; 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. Placement groove; 39. Displacement sensor; 40. Avoidance groove; 41. Motor rotor; 42. Radial magnetic bearing rotor; 43. Displacement detection ring. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] Reference Figure 1-Figure 9A super-high-speed magnetic levitation air compressor for a fuel cell comprises a housing 1 and a power assembly 22, wherein the power assembly 22 is located inside the housing 1, and both sides of the housing 1 are respectively provided with an air intake end for compressing gas and an expansion end for utilizing exhaust gas, and a bracket 10, an integrated bearing seat 11, a fixing member 12, a fixing member 2 13, a mounting ring 26, a fixing member 3 14, a radial magnetic bearing seat 15 and a connecting frame 16 are fixed to the circumferential inner wall of the housing 1 by bolts from left to right in sequence, and the power assembly passes through the bracket 10, the integrated bearing seat 11, the fixing member 12, the fixing member 2 13, the mounting ring 26, the fixing member 3 14, the radial magnetic bearing seat 15 and The connecting frame 16, wherein the mounting ring 26 is located at the center of the housing 1, the circumferential inner wall of the mounting ring 26 is bonded with the motor stator 28 and the annular winding 9, and the annular winding 9 is in contact with the motor stator 28, shortening the axial length of the motor stator 28, and the end length is greatly shortened compared to the double-layer distributed short-distance winding, so that the axial space is also shortened accordingly, and the annular winding design is adopted to increase the critical speed. Compared with the double-layer distributed short-distance winding, the end length of the annular winding 9 is further reduced, so that the axial space occupied by the motor becomes smaller, which greatly increases the critical speed of the rotor system. The motor stator 28 is used in conjunction with the power component 22 to enable the power component 2 2 rotates in the power-on state, and 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 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, and compression wheels 17 and expansion wheels 25 are provided at both ends of the power assembly 22, respectively. The compression wheel 17 is located in the air intake end, and the expansion wheel 2 5 is located in the expansion end, and 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. The first radial magnetic bearing 20, the second radial magnetic bearing 23, and the axial magnetic bearing 21 are energized to support the power assembly 22, so that the power assembly 22 can rotate stably. The power assembly 22 is energized and rotates, thereby driving the compression wheel 17 and the expansion wheel 25 to rotate, and then the air is compressed from the intake end and enters the fuel cell stack reaction through the intercooler. The exhausted exhaust gas will enter the expansion end, thereby causing the expansion wheel 25 to further rotate, recovering the energy of the gas flow in the exhaust gas, reducing the compression power consumption, and achieving higher efficiency.

[0036] Among them, the air intake end includes a diffuser 8, which is fixed to one side of the shell 1 by bolts, and the compression wheel 17 is located in the diffuser 8, and the compression wheel 17 and the diffuser 8 can be used in conjunction with each other. The rotating compression wheel 17 will compress the air in the diffuser 8 and discharge it from the other end of the diffuser 8 at the same time, 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 shell 1 by bolts, and the expansion wheel 25 is located in the guide 2, and the expansion wheel 25 and the guide 2 can be used in conjunction with each other. The discharged exhaust gas will drive the expansion wheel 25 to further rotate under the action of the guide 2, so that the rotation speed of the compression wheel 17 is faster, thereby further increasing the air intake 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, the circumferential outer walls of the first sensor bracket 19 and the second sensor bracket 24 are each provided with a plurality of avoidance grooves 40, the circumferential inner walls are each provided with the same number of placement grooves 38 as the avoidance grooves 40, and the avoidance grooves 40 are connected to the placement grooves 38, and displacement sensors 39 are each provided in the plurality of placement grooves 38, wherein 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, the imbalance size can be evaluated online and the imbalance can be actively controlled, thereby achieving a very high control accuracy of the system.

[0039] The power assembly 22 includes a first connecting shaft 29, a thrust plate 30, a sleeve 31, a motor rotor 41 and a second connecting shaft 32, wherein the motor rotor 41 is a solid samarium cobalt permanent magnet, the sleeve 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 plugged into the two sides of the sleeve 31 by interference fit, 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 plate 30 is welded on the circumferential outer wall of the first connecting shaft 29, and the thrust plate 30 is located in the axial magnetic bearing 21, and the circumferential outer walls 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 first connecting shaft 29 and the displacement detection ring 43 of the second connecting shaft 32 and the radial magnetic bearing rotor 42 are axially symmetrically distributed, and the displacement detection ring 43 and the displacement sensor 39 are used in conjunction with each other, the radial magnetic bearing rotor 42 and the two radial magnetic bearings are used in conjunction with each other, and the radial magnetic bearing rotor and the two radial magnetic bearings are used in conjunction with each other. The displacement detection ring 43 is used by the displacement sensor 39 to detect its radial and axial displacement. If there is an offset, the displacement sensor 39 detects it and feeds it back to the magnetic bearing controller. The magnetic bearing controller changes the control current loaded in the coil winding to adjust the size of the electromagnetic force, thereby realizing active control of the rotor position and the bearing stiffness and damping. The power component 22 adopts a three-stage combination to facilitate 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 to 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: when in use, the first radial magnetic bearing 20, the second radial magnetic bearing 23, and the axial magnetic bearing 21 are energized. The magnetic force generated by the axial magnetic bearing 21 after being energized can limit the thrust plate 30, thereby limiting the axial displacement of the power component 22. The magnetic force generated by the first radial magnetic bearing 20 and the second radial magnetic bearing 23 after being energized can limit the radial degree of freedom of the power component 22, so that the power component 22 can rotate stably, and at the same time can minimize the friction between the power component 22 and the shell 1 to minimize the energy loss. The power component 22 is energized and rotates, thereby driving the compression wheel 17 and the expansion wheel 25 to rotate, and then the air is compressed from the intake end and enters the fuel cell stack reaction through the intercooler. The exhausted exhaust gas will enter the expansion end, thereby causing the expansion wheel 25 to rotate further, recovering the energy of the gas flow in the exhaust gas, reducing the compression power consumption, and achieving higher efficiency.

[0046] The electrical components appearing in this article are all 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 "connection" 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, an electrical connection, a direct connection, or an indirect connection through an intermediate medium. For ordinary technicians in this field, 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, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0049] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that 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 waste gas on both sides, respectively. The circumferential inner wall of the shell (1) is fixedly connected with a bracket (10), an integrated bearing seat (11), 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) in sequence from left to right, wherein 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.

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 in 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) is fixedly connected to the other side of the housing (1), and the expansion wheel (25) is located in the guide (2), and the expansion wheel (25) and the guide (2) can be used in conjunction with each other.

4. The ultra-high-speed magnetic levitation air compressor for fuel cells according to claim 1, characterized in that: The detection mechanism comprises a first sensor bracket (19) and a second sensor bracket (24); the first sensor bracket (19) is fixedly connected between a card bracket (10) and an integrated bearing seat (11), and the card bracket (10) and the integrated bearing seat (11) are fixedly connected; the second sensor bracket (24) is fixedly connected between a radial magnetic bearing seat (15) and a connecting frame (16), and the radial magnetic bearing seat (15) and the connecting frame (16) are fixedly connected; the circumferential outer walls of the first sensor bracket (19) and the second sensor bracket (24) are both provided with a plurality of avoidance grooves (40); the circumferential inner walls are both provided with placement grooves (38) of the same number as the avoidance grooves (40), and the avoidance grooves (40) are connected to the placement grooves (38); and displacement sensors (39) are each provided in the plurality of placement grooves (38).

5. The ultra-high-speed magnetic levitation air compressor for fuel cells according to claim 1, characterized in that: 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 on the shaft In the radial magnetic bearing (21), a displacement detection ring (43) and a radial magnetic bearing rotor (42) are provided on the circumferential outer walls of the first connecting shaft (29) and the second connecting shaft (32), 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.

6. The ultra-high-speed magnetic levitation air compressor for fuel cells according to claim 1, characterized in that: The axial magnetic bearing seat (21) comprises two axial magnetic bearing stators (35), and the opposing surfaces of the two axial magnetic bearing stators (35) are each provided with a mounting groove (36), and the mounting groove (36) is fixedly connected with an axial magnetic bearing coil (37).

7. The ultra-high-speed magnetic levitation air compressor for fuel cells according to claim 1, characterized in that: 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).

8. 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 a first radial magnetic bearing (20) and a second radial magnetic bearing (23) are provided on one side of the shell (1), and two second through holes (7) for connecting external wires to a displacement sensor (39) are provided on the same side of the shell (1).

9. The ultra-high-speed magnetic levitation air compressor for fuel cells according to claim 1, characterized in that: The outer circumferential wall of the shell (1) is provided with a plurality of square heat dissipation holes (3) and a plurality of circular air holes, the outer circumferential 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).

10. 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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