Magnetic suspension radial bearing stator, radial bearing, compressor, air conditioner

Abstract

The present invention provides a magnetic levitation radial bearing stator, a radial bearing, a compressor, and an air conditioner, wherein the magnetic levitation radial bearing stator includes a stator core, the stator core has a plurality of stator teeth extending toward its axis, the stator teeth are wound with coils, the tooth shoe surfaces of the stator teeth are configured with stator comb teeth, a stator slot is formed between two adjacent stator teeth, and a filler is provided in the gap between the stator slot and the coil therein, so that the axial ends of the stator core are not connected. According to the present invention, there is no need to adopt the method of installing a sealing disk on the rotating shaft in the prior art alone, thereby reducing the space occupied by the axial length of the rotating shaft, which is conducive to reducing the length of the rotating shaft, and further reducing the fixed frequency of the rotor, expanding the operating range of the compressor magnetic levitation system and improving the operating reliability.

Description

Technical Field

[0001] The invention belongs to the technical field of compressor manufacturing, and in particular relates to a magnetic suspension radial bearing stator, a radial bearing, a compressor and an air conditioner. Background Art

[0002] Different from traditional rolling bearings and sliding bearings, magnetic bearings use electromagnetic force or permanent magnetic force to make the rotating parts suspend in the air and maintain a non-contact state with other objects. They have excellent properties such as high precision, high speed, no lubrication, and low loss. In a centrifugal compressor, the working fluid is compressed through the impeller. There is a pressure difference between the impeller inlet and outlet and the motor cavity. The rotating shaft and the rotating parts on the shaft are all clearance-fitted with the fixed parts of the centrifuge. Under the action of the pressure difference, the working fluid will pass through the gap between the rotating parts and the fixed parts, causing leakage losses and reducing the efficiency of the compressor. In order to reduce leakage losses, a labyrinth seal is usually used in engineering, and comb teeth are added at the impeller inlet. In order to reduce the volume of the compressor, the sealing at the impeller outlet is usually achieved by adding a special sealing disk and comb teeth behind the impeller, that is, Figure 1 and Figure 2 The impeller rear comb teeth in the structure will increase the shaft length to a certain extent, reduce the rotor fixed frequency, and affect the operating range and reliability of the magnetic suspension system. Summary of the invention

[0003] Therefore, the present invention provides a magnetic levitation radial bearing stator, radial bearing, compressor, and air conditioner to overcome the shortcomings of the prior art in that a sealing disk and comb teeth are separately arranged between the impeller and the motor assembly to occupy the length of the rotating shaft, reduce the fixed frequency of the rotor, and affect the operating range and reliability of the magnetic levitation system.

[0004] In order to solve the above problems, the present invention provides a magnetic levitation radial bearing stator, including a stator core, the stator core having a plurality of stator teeth extending toward its axis, coils being wound around the stator teeth, stator comb teeth being constructed on the tooth shoe surfaces of the stator teeth, a stator slot being formed between two adjacent stator teeth, and a filler being provided in the gap between the stator slot and the coil therein so that the axial ends of the stator core are not connected.

[0005] Preferably, the stator core is formed by stacking a plurality of stator punching sheets, the stator punching sheets have stator holes, and the stator holes of the plurality of stator punching sheets have different apertures.

[0006] Preferably, the filler is epoxy resin.

[0007] Preferably, the epoxy resin is filled into the gap between the stator slot and the coil therein by potting.

[0008] The present invention further provides a radial bearing, comprising a bearing stator and a bearing rotor in a stator hole, wherein the bearing stator is the above-mentioned magnetic suspension radial bearing stator.

[0009] The present invention also provides a radial bearing, comprising a bearing stator and a bearing rotor in a stator hole, wherein the bearing rotor comprises a rotor core, and a rotor comb tooth portion is configured on the outer circumferential wall of the rotor core facing the bearing stator.

[0010] Preferably, the rotor core is formed by stacking a plurality of rotor punchings, and the outer diameters of the plurality of rotor punchings are different.

[0011] The present invention also provides a compressor, comprising a magnetically suspended radial bearing, wherein the magnetically suspended radial bearing is the radial bearing described above.

[0012] Preferably, the compressor further comprises a rotating shaft, an impeller, and a motor assembly, and the magnetic suspension radial bearing is sleeved on the rotating shaft and is located between the impeller and the motor assembly.

[0013] The present invention also provides an air conditioner, comprising a compressor, wherein the compressor is the above-mentioned compressor.

[0014] The present invention provides a magnetic levitation radial bearing stator, radial bearing, compressor, and air conditioner, wherein the stator comb tooth portion is constructed on the tooth shoe surface of the stator teeth, so that when the bearing stator and the bearing rotor are matched and assembled, a labyrinth seal can be formed between the stator and rotor gaps, without the need to separately adopt the method of installing a sealing disk on the rotating shaft in the prior art, thereby reducing the space occupied by the axial length of the rotating shaft, which is beneficial to reducing the length of the rotating shaft, and further reducing the rotor fixed frequency, expanding the operating range of the compressor magnetic levitation system and improving the operating reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of a structure in which a compressor in the prior art uses a sealing disk for gap sealing;

[0016] Figure 2 It is another structural schematic diagram of a compressor using a sealing disk for gap sealing in the prior art;

[0017] Figure 3 It is a schematic diagram of the three-dimensional structure of the magnetic suspension radial bearing stator according to an embodiment of the present invention;

[0018] Figure 4 for Figure 3 Schematic diagram of the cross-sectional structure of the magnetic suspension radial bearing stator;

[0019] Figure 5 for Figure 4 A partial enlarged view of the middle A;

[0020] Figure 6 It is a schematic diagram of the assembly structure of a bearing stator and a bearing rotor in a radial bearing according to another embodiment of the present invention;

[0021] Figure 7 for Figure 6 A partial enlarged view of point B in the middle;

[0022] Figure 8 This is a schematic diagram of the internal structure of a compressor according to another embodiment of the present invention;

[0023] Fig. 9 This is a schematic diagram of the internal structure of another compressor according to yet another embodiment of the present invention.

[0024] The reference numerals are as follows:

[0025] 1. stator core; 11. stator teeth; 12. stator comb teeth; 2. coil; 3. filler; 10. bearing stator; 20. bearing rotor; 21. rotor comb teeth; 100. rotating shaft; 101. impeller; 102. magnetic suspension radial bearing; 103. motor stator; 104. motor rotor; 105. magnetic suspension axial bearing; 106. impeller comb teeth. DETAILED DESCRIPTION

[0026] See also Figures 1 to 9 As shown, according to an embodiment of the present invention, a magnetic suspension radial bearing stator is provided, including a stator core 1, wherein the stator core 1 has a plurality of stator teeth 11 extending toward its axis, and coils 2 are wound on the stator teeth 11. A stator comb tooth portion 12 is constructed on the tooth shoe surface of the stator tooth 11, and the tooth shoe surface is also the circumferential wall of the stator hole of the stator core 1. A stator slot is formed between two adjacent stator teeth 11, and a filler 3 is provided in the gap between the stator slot and the coil 2 therein, so that the axial ends of the stator core 1 are not connected. It can be understood that when the bearing stator and the bearing rotor are matched and assembled, the axial leakage gap is only the gap between the stator and the rotor. In this technical solution, the stator comb tooth portion 12 is constructed on the tooth shoe surface of the stator tooth 11, so that when the bearing stator and the bearing rotor are matched and assembled, a labyrinth seal can be formed between the stator and rotor gap, without the need to separately adopt the method of installing a sealing disk on the rotating shaft in the prior art. This can reduce the space occupied by the axial length of the rotating shaft, which is beneficial to reducing the length of the rotating shaft, and further can reduce the rotor fixed frequency, expand the operating range of the compressor magnetic suspension system and improve the operating reliability.

[0027] The stator comb teeth 12 can be formed in various ways. For example, the stator comb teeth 12 can be formed by machining and cutting the stator hole wall of the stator core 1. Preferably, the stator core 1 is formed by laminating a plurality of stator punching sheets with different stator hole diameters, which is more convenient and has lower cost. At the same time, the dimensional deviation of the inner hole wall caused by machining and cutting is eliminated. More importantly, the axial length can be adjusted by selecting different lamination thicknesses (number of punching sheets), thereby adjusting its sealing performance. The stator punching sheets can be silicon steel sheets, for example.

[0028] It can be understood that the filler 3 should be an insulating material, and the best filler 3 is epoxy resin. At this time, the epoxy resin can be filled into the gap between the stator slot and the coil 2 therein by potting, so that the sealing of the axial ends of the bearing stator is better.

[0029] According to an embodiment of the present invention, a radial bearing is further provided, comprising a bearing stator 10 and a bearing rotor 20 in a stator hole, wherein the bearing stator 10 is the above-mentioned magnetic suspension radial bearing stator. Further, the bearing rotor 20 comprises a rotor core, and a rotor comb portion 21 is configured on the outer circumferential wall of the rotor core facing the bearing stator 10. Similar to the formation method of the stator comb portion 12, preferably, the rotor core is formed by stacking a plurality of rotor punchings, and the outer diameters of the plurality of rotor punchings are different.

[0030] According to an embodiment of the present invention, a compressor is also provided, comprising a magnetic suspension radial bearing 102, wherein the magnetic suspension radial bearing is the radial bearing described above. Specifically, the compressor further comprises a rotating shaft 100, an impeller 101, and a motor assembly, wherein the motor assembly comprises a motor stator 103 and a motor rotor 104, and the magnetic suspension radial bearing 102 is mounted on the rotating shaft 100 and is located between the impeller 101 and the motor assembly. Furthermore, a magnetic suspension axial bearing 105 is also mounted on the rotating shaft 100, which works with the magnetic suspension radial bearing 102 to form reliable non-contact positioning of the rotating shaft 100 in the axial and radial directions. Corresponding impeller comb teeth 106 may also be provided on the inlet side of the impeller 101 to form a labyrinth seal on the inlet side of the impeller 101.

[0031] According to an embodiment of the present invention, there is further provided an air conditioner, comprising a compressor, wherein the compressor is the above-mentioned compressor.

[0032] 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.

[0033] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention. The above are only preferred embodiments of the present invention. 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 invention, and these improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A magnetic suspension radial bearing stator, characterized in that: The invention comprises a stator core (1), wherein the stator core (1) has a plurality of stator teeth (11) extending toward its axis, coils (2) are wound around the stator teeth (11), stator comb teeth (12) are configured on the tooth shoe surface of the stator teeth (11) facing the bearing rotor, a stator slot is formed between two adjacent stator teeth (11), and a filler (3) is provided in the gap between the stator slot and the coils (2) therein, so that the two axial ends of the stator core (1) are not connected.

2. The magnetic suspension radial bearing stator according to claim 1, characterized in that: The stator core (1) is formed by laminating a plurality of stator punching sheets, wherein the stator punching sheets have stator holes, and the stator holes of the plurality of stator punching sheets have different hole diameters.

3. The magnetic suspension radial bearing stator according to claim 1, characterized in that: The filler (3) is epoxy resin.

4. The magnetic suspension radial bearing stator according to claim 3, characterized in that: The epoxy resin is filled into the gap between the stator slot and the coil (2) therein by potting.

5. A radial bearing, comprising a bearing stator (10) and a bearing rotor (20) in a stator hole, characterized in that: The bearing stator (10) is a magnetically suspended radial bearing stator as claimed in any one of claims 1 to 4.

6. The radial bearing according to claim 5, characterized in that: The bearing rotor (20) comprises a rotor core, and a rotor comb tooth portion (21) is formed on the outer circumferential wall of the rotor core facing the bearing stator (10).

7. The radial bearing according to claim 6, characterized in that: The rotor core is formed by stacking a plurality of rotor punching sheets, and the outer diameters of the plurality of rotor punching sheets are different.

8. A compressor, comprising a magnetically suspended radial bearing (102), characterized in that: The magnetic suspension radial bearing is the radial bearing according to any one of claims 5 to 7.

9. The compressor according to claim 8, characterized in that It also includes a rotating shaft (100), an impeller (101), and a motor assembly, wherein the magnetic suspension radial bearing (102) is sleeved on the rotating shaft (100) and is located between the impeller (101) and the motor assembly.

10. An air conditioner, comprising a compressor, characterized in that: The compressor is the compressor according to claim 8 or 9.

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