Radial bearings, bearing assemblies and magnetic suspension compressors

Abstract

The present invention provides a radial bearing, a bearing assembly and a magnetic levitation compressor. The radial bearing includes: a radial ring and a stator core; a stepped shaft hole is provided on the radial ring, and the stepped shaft hole includes a first inner peripheral surface, a second inner peripheral surface and a step surface, the outer peripheral surface of the stator core cooperates with the first inner peripheral surface, and the axial end surface of the stator core cooperates with the step surface; a first fixing hole is provided on the stator core, and a second fixing hole is provided at a position corresponding to the step surface, and fasteners are inserted into the first fixing hole and the second fixing hole, and the fasteners fix the stator core on the radial ring. The radial bearing disclosed in the present invention uses fasteners to fix the radial ring and the stator core, thereby improving assembly efficiency and ensuring assembly accuracy. At the same time, rigid contact caused by interference fit is avoided, alternating electromagnetic force is eliminated, thereby reducing vibration, reducing friction loss, and preventing the problem of insufficient interference affecting assembly, and the occurrence of problems such as lamination bending deformation and eddy current loss.

Description

Technical Field

[0001] The present invention belongs to the field of magnetic suspension technology, and in particular relates to a radial bearing, a bearing assembly and a magnetic suspension compressor. Background Art

[0002] The magnetic suspension radial bearing structure includes: stator winding, stator core 2', magnetic steel 17', radial ring 1', magnetic conductive ring 13', shell 10', and box 20'. The stator core 2' and radial ring 1' are fitted by interference fit, which is rigid contact. Rigid contact can conduct electromagnetic force. The stator core 2' is wound with stator winding, and an alternating current is passed through the stator winding, which causes the internal magnetic field of the stator core 2' to change. Therefore, an alternating electromagnetic force F1 is generated at the contact surface between the stator core 2' and the radial ring 1', such as Figure 1 As shown, the stator core 2' and the radial ring 1' are in a stress state, the magnetic field is in an alternating state, and the alternating electromagnetic force F1 changes with the change of the magnetic field. Therefore, the vibration amplitude of the stator core 2' and the radial ring 1' will also change with the change of the alternating electromagnetic force F1. When the non-uniform vibration acts for a long time, it will cause serious wear on the contact surface of the two. First, it will lead to insufficient interference, affecting the fit; second, when the contact surface is severely worn, the stator core 2' is formed by laminations, which will cause the laminations to bend and deform, affecting the quality and life of the parts; third, when the contact surface is severely worn, the lamination protective layer is damaged, which will cause the internal resistance of the stator core 2' to increase, and under the action of the eddy current generated in the stator core 2', the eddy current loss will increase. Summary of the invention

[0003] Therefore, the technical problem to be solved by the present invention is that the stator core and the radial ring shrink sleeve have an interference fit, and the electromagnetic force causes wear on the contact surface, resulting in insufficient interference, deformation of the laminations, and eddy current losses, thereby providing a radial bearing, a bearing assembly and a magnetic levitation compressor.

[0004] In order to solve the above problems, the present disclosure provides a radial bearing, comprising:

[0005] Radial ring, stator core;

[0006] A stepped shaft hole is provided on the radial ring, and the stepped shaft hole includes a first inner circumferential surface, a second inner circumferential surface, and a step surface. The outer circumferential surface of the stator core cooperates with the first inner circumferential surface, and the axial end surface of the stator core cooperates with the step surface. A first fixing hole is provided on the stator core, and a second fixing hole is provided at a corresponding position of the step surface. Fasteners are inserted into the first fixing hole and the second fixing hole, and the fasteners fix the stator core on the radial ring.

[0007] In some embodiments, the first fixing hole and the second fixing hole are threaded holes, and the fasteners are screws.

[0008] In some embodiments, there are at least two first fixing holes, and the at least two first fixing holes are evenly arranged on the stator core along the circumferential direction. The number of the second fixing holes is the same as that of the first fixing holes, and the positions are corresponding.

[0009] In some embodiments, the radial bearing also includes a shell, the shell is provided with a first space which is open at one axial end, the radial ring is arranged in the first space of the shell, and the opening of the first space is provided with a cover plate structure, and the cover plate structure is constructed to be able to be pressed against the axial end face of the radial ring and the stator core.

[0010] In some embodiments, the radial bearing also includes a magnetic ring, which is arranged in the first space and assembled on the bottom wall of the first space. A first limiting structure is provided on the magnetic ring, and a second limiting structure is provided on the bottom wall of the first space. The first limiting structure and the second limiting structure cooperate to radially limit the magnetic ring.

[0011] In some embodiments, the first limiting structure is a limiting column protruding along the axial direction of the radial bearing, and the second limiting structure is a limiting groove concave along the axial direction of the radial bearing.

[0012] In some embodiments, the magnetic conductive ring and the radial ring are coaxially arranged, and the radial ring and the magnetic conductive ring are axially connected by a pin member.

[0013] In some embodiments, a magnetic steel is further provided between the magnetic conductive ring and the radial ring, and the pin member passes through the magnetic steel.

[0014] In some embodiments, a gap is provided between the outer circumference of the radial ring and the inner circumference of the first space, and / or a gap is provided between the outer circumference of the magnetic ring and the inner circumference of the first space, and / or a gap is provided between the outer circumference of the magnetic steel and the inner circumference of the first space.

[0015] In some embodiments, the outer circumference of the radial ring and the inner circumference of the first space are filled with potting glue, and / or the outer circumference of the magnetic ring and the inner circumference of the first space are filled with potting glue, and / or the outer circumference of the magnetic steel and the inner circumference of the first space are filled with potting glue.

[0016] In some embodiments, a clearance groove is provided on the cover plate structure, the position of the clearance groove corresponds to the fastener, and the clearance groove accommodates the end of the fastener.

[0017] In some embodiments, the radial bearing also includes a box body, which is provided with a second space open at one axial end, the opening of the first space is in the same direction as the opening of the second space, the shell is arranged in the second space of the box body, the cover structure covers the opening of the two spaces, and the cover structure is also constructed to be able to press the shell into the second space.

[0018] In some embodiments, a fixing hole is provided on the box body, and the cover plate structure is fixedly connected to the box body through the fixing hole.

[0019] A bearing assembly adopts the radial bearing mentioned above.

[0020] The purpose of the present disclosure and the solution of its technical problems can also be further achieved by adopting the following technical measures.

[0021] In some embodiments, an axial bearing is also included, which is coaxially arranged with the radial bearing. When the radial bearing includes a first space and a cover plate structure, the axial bearing is arranged outside the opening of the first space. The cover plate structure is made of non-magnetic material, and the cover plate structure is also configured to increase the electromagnetic gap between the radial bearing and the axial bearing.

[0022] A magnetic suspension compressor adopts the radial bearing or the bearing assembly mentioned above.

[0023] The radial bearing, bearing assembly and magnetic suspension compressor provided by the present disclosure have at least the following beneficial effects:

[0024] The radial bearing disclosed in the present invention eliminates the shrink-fit assembly method between the radial ring and the stator core, and adopts fasteners to fix the radial ring and the stator core, thereby improving assembly efficiency and ensuring assembly accuracy. At the same time, the rigid contact caused by interference fit between the stator core and the radial ring is avoided, and the alternating electromagnetic force is eliminated, thereby reducing vibration, reducing friction loss, and preventing the assembly problem caused by insufficient interference, and the occurrence of problems such as lamination bending deformation and eddy current loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic diagram of the alternating electromagnetic force in a radial bearing in the related art;

[0026] Figure 2 A schematic diagram of the mutual inductance of magnetic fields between radial bearings and axial bearings in the related art;

[0027] Figure 3 is a schematic structural diagram of a radial bearing according to an embodiment of the present disclosure;

[0028] Figure 4 An exploded view of the parts of a radial bearing according to an embodiment of the present disclosure;

[0029] Figure 5 It is a schematic structural diagram of a radial ring according to an embodiment of the present disclosure;

[0030] Figure 6 Schematic diagram of the cover structure of the embodiment of the present disclosure.

[0031] The reference numerals are:

[0032] 1. Radial ring; 2. Stator core; 3. Step shaft hole; 4. First inner circumference; 5. Second inner circumference; 6. Step surface; 7. First fixing hole; 8. Second fixing hole; 9. Fastener; 10. Shell; 11. First space; 12. Cover plate structure; 13. Magnetic ring; 14. Limiting column; 15. Limiting groove; 16. Pin piece; 17. Magnetic steel; 18. Potting glue; 19. Make way groove; 20. Box; 21. Second space; 22. Third fixing hole; 23. Pin hole. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the present disclosure clearer, the technical solutions of the present disclosure will be clearly and completely described below in combination with the specific embodiments of the present disclosure and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present disclosure.

[0034] Combination Figures 3 to 6 As shown, the embodiment of the present disclosure provides a radial bearing, including: a radial ring 1 and a stator core 2; a stepped shaft hole 3 is provided on the radial ring 1, and the stepped shaft hole 3 includes a first inner peripheral surface 4, a second inner peripheral surface 5, and a step surface 6, the outer peripheral surface of the stator core 2 cooperates with the first inner peripheral surface 4, and the axial end surface of the stator core 2 cooperates with the step surface 6; a first fixing hole 7 is provided on the stator core 2, and a second fixing hole 8 is provided at a corresponding position of the step surface 6, and fasteners 9 are inserted into the first fixing hole 7 and the second fixing hole 8, and the fasteners 9 fix the stator core 2 on the radial ring 1.

[0035] The radial bearing of the disclosed embodiment cancels the shrink fit assembly method between the radial ring 1 and the stator core 2, and adopts the fastener 9 to fix the stator core 2 in the form of a perforation, thereby improving the assembly efficiency and ensuring the assembly accuracy. At the same time, the rigid contact caused by the interference fit between the stator core 2 and the radial ring 1 is avoided, the alternating electromagnetic force is eliminated, thereby reducing vibration, reducing friction loss, and preventing the assembly problem caused by insufficient interference, and the occurrence of problems such as lamination bending deformation and eddy current loss.

[0036] In some embodiments, the first fixing hole 7 and the second fixing hole 8 are threaded holes, and the fastener 9 is a screw. In this embodiment, the stator core 2 and the radial ring 1 are locked with screws to improve assembly efficiency and ensure assembly accuracy. The screws are made of magnetic conductive material, and the magnetic circuit of the stator core 2 will be transmitted to the radial ring 1 through the screws. In order to avoid the magnetic isolation effect of the threaded hole, the matching clearance between the screw and the third fixing hole 22 is made as small as possible to ensure that the magnetic isolation effect is relatively small.

[0037] In some embodiments, the stator core 2 is formed by stacking silicon steel sheets formed by die stamping to a certain thickness to provide a radial electromagnetic circuit. The stator winding is wound on the stator core 2. The stator winding is formed by winding enameled wire to form a coil. The coil is fixed to the stator core 2 by embedding the wire to provide radial electromagnetic force, and the radial electromagnetic force drives the shaft to suspend radially.

[0038] In some embodiments, there are at least two first fixing holes 7, and at least two first fixing holes 7 are evenly arranged on the stator core 2 along the circumferential direction, and the number of second fixing holes 8 is the same as that of the first fixing holes 7, and the positions are corresponding. Preferably, the radial ring 1 is made of magnetic conductive material by machining, and there are 4 first fixing holes 7 and 4 second fixing holes 8, which are opened on the radial ring 1 at intervals of 90° along the circumferential direction. The stator core 2 is fitted with the radial ring 1, and the stator core 2 and the radial ring 1 are tightened with screws to fix the two to form an integral structure, thereby reducing the vibration of the alternating electromagnetic force and reducing friction loss.

[0039] In some embodiments, the radial bearing further comprises a housing 10, which is made of a non-magnetic material (such as aluminum alloy) by pressure casting. Pressure casting can effectively reduce the number of air holes or air bubbles inside the casting, which is beneficial to improving the strength of the casting, improving the seismic resistance, reducing the noise during vibration, etc. The housing 10 is provided with a first space 11 opened along one axial end of the radial bearing, and the radial ring 1 is arranged in the first space 11 of the housing 10. The opening of the first space 11 is provided with a cover plate structure 12, which is constructed to be able to press against the axial end faces of the radial ring 1 and the stator core 2, so as to press the radial ring 1, the stator core 2, the magnetic steel 17, and the magnetic conductive ring 13 together in the first space 11. The cover plate structure 12 of this embodiment presses the radial ring 1 in the first space 11, assembles the radial ring 1, the stator core 2, and the housing 10 into a whole, replaces the shrink fit of the radial ring 1 and the housing 10, and limits the axial and radial displacements of the radial ring 1 and the stator core 2.

[0040] In some embodiments, the radial bearing further comprises a magnetic ring 13, which is made of magnetic material by machining, is disposed in the first space 11, and is assembled on the bottom wall of the first space 11, a first limiting structure is provided on the magnetic ring 13, and a second limiting structure is provided on the bottom wall of the first space 11, and the first limiting structure and the second limiting structure can be assembled and matched along the radial direction of the radial bearing to radially limit the magnetic ring 13. The housing 10 of this embodiment cooperates with the magnetic ring 13 through the limiting structure, and the limiting structure radially limits the magnetic ring 13 in the housing 10, so that the magnetic ring 13 can be fitted in the housing 10 without an interference fit, thereby avoiding rigid contact, eliminating alternating electromagnetic force, and reducing vibration wear between the housing 10 and the magnetic ring 13.

[0041] In some embodiments, the first limiting structure is a limiting column 14 protruding on the end surface of the magnetic conductive ring 13 along the axial direction of the radial bearing, and the second limiting structure is a limiting groove 15 concave on the bottom wall of the housing 10 along the axial direction of the radial bearing. The limiting structure of this embodiment adopts the form of limiting column 14 and limiting groove 15, which is convenient for processing and assembly, and is conducive to improving assembly efficiency.

[0042] In some embodiments, the magnetic conductive ring 13 is coaxially arranged with the radial ring 1, and the radial ring 1 and the magnetic conductive ring 13 are axially connected to form an integral structure through a pin member 16, and the pin member 16 radially limits the radial ring 1. The radial ring 1, the magnetic conductive ring 13, and the magnetic steel 17 are locked by the pin member to form an integral structure. In this embodiment, in order to ensure the assembly coaxiality of the magnetic conductive ring 13 and the radial ring 1, a pin hole 23 is opened on the magnetic conductive ring 13 and the radial ring 1, and the pin member 16 is inserted into the pin hole 23, so that the magnetic conductive ring 13 and the radial ring 1 maintain a high coaxiality. At the same time, the magnetic conductive ring 13 and the housing 10 are radially limited by a limiting structure. Through the cooperation of the pin member 16 and the pin hole 23, the limiting structure indirectly plays a radial limiting role on the radial ring 1.

[0043] In some embodiments, a magnetic steel 17 is further provided between the magnetic conductive ring 13 and the radial ring 1, and a pin member 16 passes through the magnetic steel 17, and the pin member 16 radially limits the magnetic steel 17. The pin member 16 in this embodiment enables the magnetic steel 17 to maintain a high degree of coaxiality with the magnetic conductive ring 13 and the radial ring 1, and at the same time, the limiting structure indirectly limits the magnetic steel 17 radially.

[0044] In the related art, the radial magnetic circuit formed by the stator winding passes through the radial ring and the magnetic conductive ring, and the radial ring, the magnetic conductive ring and the housing are in interference fit, which is a rigid contact. Figure 1 As shown, non-uniform alternating electromagnetic force F2 and alternating electromagnetic force F3 will also be generated. In addition, the radial ring, magnetic steel, magnetic conductive ring and the housing are in interference fit, and need to be heat-fitted twice to form an integral structure, which has a complex assembly process and low assembly efficiency.

[0045] In some embodiments, a gap is provided between the outer circumference of the radial ring 1 and the inner circumference of the first space 11, and / or a gap is provided between the outer circumference of the magnetic ring 13 and the inner circumference of the first space 11, and / or a gap is provided between the outer circumference of the magnetic steel 17 and the inner circumference of the first space 11.

[0046] In this embodiment, a gap is retained between the radial ring 1, and / or the magnetic ring 13, and / or the magnetic steel 17 and the shell 10, and the above-mentioned components are limited axially / radially only by the limiting structure, the pin member 16 and the cover plate structure 12, thereby eliminating the interference fit of the shrink fit, eliminating the rigid contact, and eliminating the vibration loss of the alternating electromagnetic force.

[0047] In some embodiments, the outer circumference of the radial ring 1 and the inner circumference of the first space 11 are filled with potting glue 18; and / or, the outer circumference of the magnetic ring 13 and the inner circumference of the first space 11 are filled with potting glue 18. Preferably, when the magnetic ring 13 and the shell 10 are matched through a limiting structure, the limiting column 14 and the limiting groove 15 are also filled with potting glue 18 to avoid rigid contact between the limiting column 14 and the limiting groove 15, and / or, the outer circumference of the magnet 17 and the inner circumference of the first space 11 are filled with potting glue 18.

[0048] In this embodiment, the housing 10, the magnetic ring 13, the magnetic steel 17, and the radial ring 1 are potted instead of interference fit, which plays three roles: fixing parts, increasing damping and reducing vibration noise; limiting part displacement; increasing flexible contact, eliminating alternating electromagnetic force, reducing electromagnetic loss, reducing internal resistance loss, and improving bearing life. The housing 10, the magnetic ring 13, the magnetic steel 17, and the radial ring 1 are initially fixed by the pin 16, the positioning column, and the limit groove 15, and a filling gap is left on the radial contact surface. By adding potting glue 18 in it, it is completely filled to increase the radial flexible contact ability.

[0049] In some embodiments, a clearance groove 19 is provided on the cover plate structure 12, and the position of the clearance groove 19 corresponds to the fastener 9, and the clearance groove 19 accommodates the end of the fastener 9. In this embodiment, after the fastener 9 locks the stator core 2 and the radial ring 1, the countersunk design cannot be used, otherwise it may affect the magnetic conductivity of the stator core, and a part of the structure needs to be left outside the end surface. The clearance groove 19 is designed on the cover plate structure 12, and the structure of other parts is pressed against the end surface of the stator core 2, which plays a role in pressing and fixing the stator core 2, that is, magnetic isolation.

[0050] In some embodiments, the radial bearing further comprises a housing 20, the housing 20 (non-magnetic conductive material) is used to fix the housing 10, the housing 20 is provided with a second space 21 which is open at one axial end, the opening of the first space 11 is in the same direction as the opening of the second space 21, the housing 10 is arranged in the second space 21 of the housing 20, the cover plate structure 12 covers the opening of the second space, and the cover plate structure 12 is also constructed to be able to press the housing 10 in the second space 21. The housing 20 structure is used to accommodate the housing 10 and protect the internal structure of the radial bearing. In the related art, the housing 10 and the housing 20 also adopt interference fit, which is difficult to assemble and has low assembly efficiency. In this embodiment, the cover plate structure 12 is used to press the radial ring 1, the stator core 2, etc. inside and outside the housing 10, and can also play a role in pressing the housing 10 in the housing 20.

[0051] In some embodiments, the box body 20 is provided with a third fixing hole 22, and the cover plate structure 12 is fixedly connected to the box body 20 through the third fixing hole 22. In this embodiment, the box body 20 and the cover plate structure 12 are fixedly connected by screws, which is simple to assemble and has reliable connection performance.

[0052] The disclosed embodiment also provides a bearing assembly, which adopts the above-mentioned radial bearing.

[0053] In the related art, both the radial bearing and the axial bearing core have electromagnetic windings, the assembled electromagnetic gap is small, and the radial magnetic circuit is close to the axial magnetic circuit. When alternating current is passed through the two windings, an induced electromotive force will be induced inside the radial bearing due to the change in the magnetic field of the axial winding. Since the radial core is a conductor, the induced electromotive force will generate eddy current I1 in the core, and this eddy current I1 will generate eddy current loss P1. Similarly, the axial bearing will generate eddy current I2 due to the induction of the radial winding, and this eddy current I2 will generate eddy current loss P2, such as Figure 2 As shown in the figure, due to the small electromagnetic clearance between the radial bearing and the axial bearing, magnetic circuit interference occurs, affecting the bearing control. In order to avoid such magnetic circuit interference, the radial bearing and the axial bearing need to maintain a larger axial clearance in the prior art, but this will cause the axial dimension of the bearing assembly to be larger, affecting the normal use of the bearing assembly.

[0054] In some embodiments, an axial bearing is further included, and the axial bearing is coaxially arranged with the radial bearing. When the radial bearing includes the first space 11 and the cover plate structure 12, the axial bearing is arranged outside the opening of the first space 11, and the cover plate structure 12 is made of non-magnetic conductive material. The cover plate structure 12 can also increase the electromagnetic gap between the radial bearing and the axial bearing. The thickness of the cover plate structure 12 can be determined according to the maximum allowable gap between the radial bearing and the axial bearing to ensure the best magnetic isolation effect.

[0055] The cover structure 12 of the present embodiment covers the opening of the shell 10 and is also located between the radial bearing and the axial bearing. Since air itself is a material, it can conduct magnetism, but its magnetic permeability is low. The cover structure 12 supported by non-magnetic materials is completely non-magnetic, and its magnetic permeability is 0 or even negative. It can effectively isolate magnetism, eliminate, and offset the electromagnetic effects transmitted, completely block the radial magnetic circuit and the axial magnetic circuit, and avoid interference between the two magnetic circuits.

[0056] In this embodiment, a magnetically isolating cover plate structure 12 is added between the axial bearing and the radial bearing to increase the electromagnetic gap between the radial and axial bearings, reduce magnetic circuit interference, and improve the bearing control accuracy; at the same time, the cover plate structure 12 fastens the stator core 2 and radial ring 1 of the radial bearing to limit their axial displacement and prevent abnormal axial vibration; the cover plate structure 12 isolates the radial and axial bearings from induced eddy currents and eddy current losses, effectively improving the bearing life and efficiency.

[0057] The radial bearing and bearing assembly disclosed in the present invention can ensure assembly accuracy, reduce assembly difficulty, and improve production efficiency. The fastener 9 is axially locked, eliminating the rigid contact between the housing 10, the radial ring 1, and the stator core 2, and using flexible contact instead, reducing contact friction and vibration. The fixing form of the fastener 9 reduces the problem of insufficient interference caused by heat-shrink deformation or abnormal vibration wear due to alternating electromagnetic force, and improves product reliability. The friction between the core and the radial ring 1, the housing 10 and the radial ring 1, and the magnetic ring 13 is reduced, the vibration abnormality is reduced, the increase in internal resistance and loss caused by vibration friction is avoided, and the product efficiency and reliability are improved. The cover plate structure 12 limits the radial and axial displacement and vibration of the radial bearing, and increases the gap between the axial magnetic circuit and the radial magnetic circuit, which can effectively isolate the radial bearing and the axial bearing from generating eddy currents and eddy current losses, effectively improve efficiency, and at the same time reduce magnetic circuit interference to ensure bearing control accuracy.

[0058] The present disclosure also provides a magnetic levitation compressor, which adopts the above-mentioned radial bearing or the above-mentioned bearing assembly.

[0059] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0060] The above are only preferred embodiments of the present disclosure and are not intended to limit the present disclosure. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present disclosure shall be included in the protection scope of the present disclosure. The above are only preferred implementations of the present disclosure. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present disclosure, and these improvements and variations should also be regarded as the protection scope of the present disclosure.

Claims

1. A radial bearing, characterized in that: include: Radial ring (1), stator core (2); The radial ring (1) is provided with a stepped shaft hole (3), the stepped shaft hole (3) comprising a first inner peripheral surface (4), a second inner peripheral surface (5), and a step surface (6), the outer peripheral surface of the stator core (2) cooperates with the first inner peripheral surface (4), and the axial end surface of the stator core (2) cooperates with the step surface (6); the stator core (2) is provided with a first fixing hole (7), a second fixing hole (8) is provided at a position corresponding to the step surface (6), the first fixing hole (7) and the second fixing hole (8) are connected with fasteners (9), and the fasteners (9) fix the stator core (2) to the radial ring (1); The radial bearing further comprises a housing (10), the housing (10) being provided with a first space (11) with one axial end open, the radial ring (1) being arranged in the first space (11) of the housing (10), the opening of the first space (11) being provided with a cover plate structure (12), the cover plate structure (12) being configured to be able to be tightly pressed against the axial end surfaces of the radial ring (1) and the stator core (2); The radial bearing further comprises a housing (20), wherein the housing (20) is provided with a second space (21) which is open at one axial end, wherein the opening of the first space (11) is in the same direction as the opening of the second space (21), and the housing (10) is arranged in the second space (21) of the housing (20), and the cover plate structure (12) covers the openings of the two spaces, and the cover plate structure (12) is also constructed to be able to press the housing (10) into the second space (21).

2. The radial bearing according to claim 1, characterized in that: The first fixing hole (7) and the second fixing hole (8) are threaded holes, and the fastener (9) is a screw.

3. The radial bearing according to claim 1, characterized in that: There are at least two first fixing holes (7), and the at least two first fixing holes (7) are evenly arranged on the stator core (2) along the circumferential direction. The number of the second fixing holes (8) is the same as that of the first fixing holes (7), and the positions thereof correspond.

4. The radial bearing according to claim 1, characterized in that: The radial bearing also includes a magnetic ring (13), which is arranged in the first space (11) and assembled on the bottom wall of the first space (11). The magnetic ring (13) is provided with a first limiting structure, and the bottom wall of the first space (11) is provided with a second limiting structure. The first limiting structure cooperates with the second limiting structure to radially limit the magnetic ring (13).

5. The radial bearing according to claim 4, characterized in that: The first limiting structure is a limiting column (14) protruding along the axial direction of the radial bearing, and the second limiting structure is a limiting groove (15) concave along the axial direction of the radial bearing.

6. The radial bearing according to claim 4, characterized in that: The magnetic conductive ring (13) is coaxially arranged with the radial ring (1), and the radial ring (1) and the magnetic conductive ring (13) are axially connected via a pin member (16).

7. The radial bearing according to claim 6, characterized in that: A magnetic steel (17) is also provided between the magnetic conductive ring (13) and the radial ring (1), and the pin member (16) passes through the magnetic steel (17).

8. The radial bearing according to claim 7, characterized in that: A gap is provided between the outer circumference of the radial ring (1) and the inner circumference of the first space (11), and / or a gap is provided between the outer circumference of the magnetic conductive ring (13) and the inner circumference of the first space (11), and / or a gap is provided between the outer circumference of the magnetic steel (17) and the inner circumference of the first space (11).

9. The radial bearing according to claim 7, characterized in that: The outer circumference of the radial ring (1) and the inner circumference of the first space (11) are filled with potting glue (18), and / or the outer circumference of the magnetic conductive ring (13) and the inner circumference of the first space (11) are filled with potting glue (18), and / or the outer circumference of the magnetic steel (17) and the inner circumference of the first space (11) are filled with potting glue (18).

10. The radial bearing according to claim 1, characterized in that: The cover plate structure (12) is provided with a clearance groove (19), the position of the clearance groove (19) corresponds to the fastener (9), and the clearance groove (19) accommodates the end of the fastener (9).

11. The radial bearing according to claim 1, characterized in that: The box body (20) is provided with a third fixing hole (22), and the cover plate structure (12) is fixedly connected to the box body (20) through the third fixing hole (22).

12. A bearing assembly, characterized in that: A radial bearing as described in any one of claims 1 to 11 is used.

13. The bearing assembly according to claim 12, characterized in that The invention also includes an axial bearing, which is coaxially arranged with the radial bearing. When the radial bearing includes a first space (11) and a cover plate structure (12), the axial bearing is arranged outside the opening of the first space (11). The cover plate structure (12) is made of a non-magnetic material. The cover plate structure (12) is also configured to increase the electromagnetic gap between the radial bearing and the axial bearing.

14. A magnetic levitation compressor, characterized in that: A radial bearing as described in any one of claims 1 to 11, or a bearing assembly as described in any one of claims 12 to 13 is used.

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