Magnetic bearing device, and ventilation and heat dissipation structure for potted radial magnetic bearing thereof

Abstract

Provided are a ventilation and heat dissipation structure for a potted radial magnetic bearing, and a magnetic bearing device comprising the heat dissipation structure. The ventilation and heat dissipation structure for a potted radial magnetic bearing comprises: a protective bearing support (1); a displacement sensor assembly (2); a radial electromagnet stator assembly (3); a radial magnetic bearing housing (4); and an electric motor rotor (5), wherein the protective bearing support, the displacement sensor assembly, the radial electromagnet stator assembly and the radial magnetic bearing housing are sequentially sleeved on an outer peripheral portion of the electric motor rotor, at least one of the radial electromagnet stator assembly and the displacement sensor assembly is provided with a thermally conductive potting adhesive (8), and the protective bearing support, the displacement sensor assembly, the radial electromagnet stator assembly and the radial magnetic bearing housing are provided with corresponding ventilation structures (13) to communicate an electric motor chamber with an impeller chamber. The device allows for effective ventilation heat dissipation even when at least one of an electromagnet and a sensor is potted.

Description

Magnetic bearing device and encapsulated radial magnetic bearing ventilation and heat dissipation structure thereof

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on December 12, 2023, with application number 202311706462.0 and invention name “Magnetic bearing device and its encapsulated radial magnetic bearing ventilation and heat dissipation structure”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present invention relates to the field of magnetic bearing technology, and more specifically, to a potted radial magnetic bearing ventilation and heat dissipation structure. Furthermore, the present invention also relates to a magnetic bearing device including the potted radial magnetic bearing ventilation and heat dissipation structure. Background Art

[0003] In related technologies, radial electromagnet assemblies generally adopt a non-potted structure. In this case, cooling air can flow through the relevant gaps. However, if one of the components between the sensor and the electromagnet adopts a potted type, the cooling air duct will be blocked.

[0004] Because the working fluid of the refrigeration compressor and waste heat generator is Freon, which is somewhat corrosive, and when used in other harsh working conditions, the electromagnet and sensor are potted to further protect them and extend their service life. This means that a chamber is formed between the radial magnetic bearing assembly and the impeller volute, into which the working fluid inside the impeller volute can leak.

[0005] On the one hand, if high-temperature working fluids are not ventilated and dissipated, coupled with windage losses from the high-speed rotor, the temperature inside the chamber will further rise, leading to excessive temperatures in the radial magnetic assembly. On the other hand, for Freon-based working fluids that cannot be discharged directly into the air, the Freon used for cooling the motor chamber and the Freon leaking from the impeller volute must be recovered through pipelines. Currently, two sets of pipelines are installed outside the components to recover the Freon, but this results in a very complex piping system.

[0006] In summary, how to effectively ventilate and dissipate heat and recover Freon in the case where at least one of the electromagnet or the sensor is potted is an urgent problem to be solved by those skilled in the art.

[0007] Summary of the Invention

[0008] In view of this, the object of the present invention is to provide a ventilation and heat dissipation structure for an encapsulated radial magnetic bearing, which can effectively ventilate and dissipate heat when at least one of the electromagnet or sensor is encapsulated. Moreover, this device can effectively simplify the external pipeline for collecting Freon-like working fluids, and only one set of pipelines is required to collect Freon-like working fluids.

[0009] Another object of the present invention is to provide a magnetic bearing device including the above-mentioned encapsulated radial magnetic bearing ventilation and heat dissipation structure.

[0010] In order to achieve the above object, the present invention provides the following technical solutions:

[0011] A potted radial magnetic bearing ventilation and heat dissipation structure, comprising:

[0012] Protect bearing bracket;

[0013] Displacement sensor assembly;

[0014] radial electromagnet stator assembly;

[0015] Radial magnetic bearing housing;

[0016] The motor rotor, the protective bearing bracket, the displacement sensor assembly, the radial electromagnetic stator assembly, and the radial magnetic bearing seat are sequentially sleeved on the outer periphery of the motor rotor, and at least one of the radial electromagnetic stator assembly and the displacement sensor assembly is provided with a thermally conductive potting compound;

[0017] The protective bearing bracket, the displacement sensor assembly, the radial electromagnet stator assembly and the radial magnetic bearing seat are correspondingly provided with ventilation structures to connect the motor chamber and the impeller chamber.

[0018] In one embodiment, the ventilation structure includes heat dissipation slots provided on the outer circumference of the stator core of the radial electromagnet stator assembly;

[0019] The ventilation structure of the protective bearing bracket, the displacement sensor assembly and the radial magnetic bearing seat includes ventilation holes arranged at positions corresponding to the heat dissipation slots.

[0020] In one embodiment, the heat dissipation slot is provided between two adjacent magnetic pole pairs, and adjacent magnetic poles in the two magnetic pole pairs are magnetic poles of the same name.

[0021] In one embodiment, the number of the heat dissipation slots is the same as the number of the magnetic pole pairs.

[0022] In one embodiment, the heat dissipation slot is provided at a yoke portion between two adjacent magnetic poles of the same name, and the heat dissipation slot is located in an area that bypasses the magnetic circuit of the radial electromagnet stator assembly.

[0023] In one embodiment, two adjacent electromagnetic coils of the radial electromagnetic stator assembly and the stator core yoke portion form a triangular gap area, and the ventilation structure includes heat dissipation holes provided in the triangular gap area;

[0024] The ventilation structures of the protective bearing bracket, the displacement sensor assembly and the radial magnetic bearing seat include ventilation holes arranged at positions corresponding to the heat dissipation holes.

[0025] In one embodiment, the heat dissipation hole is provided on a side of the triangular gap region close to the stator core;

[0026] Or the heat dissipation hole is arranged on a side of the triangular gap area close to the motor rotor.

[0027] A magnetic bearing device comprises the encapsulated radial magnetic bearing ventilation and heat dissipation structure described in any one of the above items and a power device, wherein the motor rotor of the encapsulated radial magnetic bearing ventilation and heat dissipation structure is connected to the power device.

[0028] When using the encapsulated radial magnetic bearing ventilation and heat dissipation structure provided by the present invention, since at least one of the radial electromagnet stator assembly and the displacement sensor assembly is provided with a thermally conductive encapsulating glue, that is, the present device is an electromagnet with an encapsulated structure, by correspondingly arranging ventilation structures on the protective bearing bracket, the displacement sensor assembly, the radial electromagnet stator assembly and the radial magnetic bearing seat, the motor chamber and the impeller chamber can be connected, so that the cooling air duct will not be blocked, that is, the cooling air can flow along the ventilation structure in the motor chamber and the impeller chamber.

[0029] Such an arrangement, on the one hand, can ventilate and dissipate heat for the high-temperature working medium through the ventilation structure. In addition, the high-speed operation of the rotor in the motor chamber and the increase in wind friction loss will cause the temperature of the motor chamber to further increase. By setting up a ventilation structure, the temperature of the radial electromagnet stator assembly caused by the increase in the motor chamber temperature can be avoided from being too high.

[0030] On the other hand, for Freon-like working fluids that cannot be discharged directly, the Freon used for cooling in the motor chamber and the Freon leaked from the impeller volute need to be recovered through pipelines. By establishing channels (ventilation structures) inside the motor chamber and the impeller chamber, only one set of pipelines is needed to effectively recover the Freon. That is, this device can effectively simplify the external pipelines for collecting Freon-like working fluids and effectively collect Freon-like working fluids.

[0031] In summary, the encapsulated radial magnetic bearing ventilation and heat dissipation structure provided by the present invention can effectively ventilate and dissipate heat when at least one of the electromagnet or sensor is encapsulated. Moreover, this device can effectively simplify the external pipeline for collecting Freon-like working fluids, and only one set of pipelines is required to collect Freon-like working fluids.

[0032] In addition, the present invention also provides a magnetic bearing device including the above-mentioned encapsulated radial magnetic bearing ventilation and heat dissipation structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without any creative work.

[0034] FIG1 is a cross-sectional view of a first embodiment of a ventilation and heat dissipation structure of an encapsulated radial magnetic bearing provided by the present invention;

[0035] FIG2 is a schematic structural diagram of a radial electromagnet stator assembly provided with heat dissipation slots according to a first embodiment;

[0036] FIG3 is a schematic structural diagram of a displacement sensor assembly potted with a thermally conductive potting compound according to the first embodiment;

[0037] FIG4 is a cross-sectional view of a second embodiment of a ventilation and heat dissipation structure of an encapsulated radial magnetic bearing;

[0038] FIG5 is a schematic structural diagram of a radial electromagnet stator assembly potted with a heat-conducting potting compound according to a second embodiment;

[0039] FIG6 is a schematic structural diagram of a displacement sensor assembly potted with a thermally conductive potting compound according to a second embodiment;

[0040] FIG7 is a cross-sectional view of a third embodiment of a ventilation and heat dissipation structure of an encapsulated radial magnetic bearing;

[0041] FIG8 is a schematic structural diagram of a radial electromagnet stator assembly potted with a heat-conducting potting compound according to a third embodiment;

[0042] FIG9 is a schematic structural diagram of a displacement sensor assembly potted with a thermally conductive potting compound according to a third embodiment.

[0043] In Figures 1 to 9: 1 is the protective bearing bracket, 2 is the displacement sensor assembly, 3 is the radial electromagnet stator assembly, 4 is the radial magnetic bearing seat, 5 is the motor rotor, 6 is the electromagnet coil, 7 is the stator core, 8 is the thermal potting compound, 9 is the heat dissipation groove, 10 is the heat dissipation hole, 11 is the ventilation hole, 12 is the triangular gap area, and 13 is the ventilation structure. DETAILED DESCRIPTION

[0044] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0045] The core of this invention is to provide a potted radial magnetic bearing ventilation and heat dissipation structure. This structure can effectively ventilate and dissipate heat when at least one of the electromagnet or sensor is potted. Furthermore, this device can effectively simplify the external piping for collecting Freon-like working fluids, requiring only one set of piping to collect Freon-like working fluids. Another core of the invention is to provide a magnetic bearing device that includes the above-mentioned potted radial magnetic bearing ventilation and heat dissipation structure.

[0046] Please refer to Figures 1 to 9.

[0047] This specific embodiment provides a potted radial magnetic bearing ventilation and heat dissipation structure, including:

[0048] Protective bearing bracket 1;

[0049] Displacement sensor assembly 2;

[0050] Radial electromagnet stator assembly 3;

[0051] Radial magnetic bearing seat 4;

[0052] The motor rotor 5, the protective bearing bracket 1, the displacement sensor assembly 2, the radial electromagnetic stator assembly 3 and the radial magnetic bearing seat 4 are sequentially sleeved on the outer periphery of the motor rotor 5, and at least one of the radial electromagnetic stator assembly 3 and the displacement sensor assembly 2 is provided with a thermally conductive potting glue 8; the protective bearing bracket 1, the displacement sensor assembly 2, the radial electromagnetic stator assembly 3 and the radial magnetic bearing seat 4 are correspondingly provided with a ventilation structure 13 to connect the motor chamber and the impeller chamber.

[0053] It should be noted that the left end of the motor rotor 5 is the impeller chamber, and the right end of the motor rotor 5 is the motor chamber. By setting the ventilation structure 13, it is beneficial for the gaseous medium to flow between the motor chamber and the impeller chamber, thereby achieving cooling of the motor chamber.

[0054] It should also be noted that the radial electromagnet stator assembly 3 includes a stator core 7 and an electromagnet coil 6, wherein the stator core 7 is arranged on the outer periphery of the motor rotor 5, and magnetic poles are evenly distributed along the circumference of the stator core 7, and the electromagnet coil 6 is wound on the magnetic poles.

[0055] During actual use, the shape, structure, size, position, etc. of the motor rotor 5, protective bearing bracket 1, displacement sensor assembly 2, radial electromagnet stator assembly 3, radial magnetic bearing seat 4 and ventilation structure 13 can be determined according to actual conditions and actual needs.

[0056] When using the encapsulated radial magnetic bearing ventilation and heat dissipation structure provided by the present invention, since at least one of the radial electromagnet stator assembly 3 and the displacement sensor assembly 2 is provided with a thermally conductive encapsulating glue 8, that is, the present device is an electromagnet with an encapsulated structure, by correspondingly arranging the ventilation structure 13 on the protective bearing bracket 1, the displacement sensor assembly 2, the radial electromagnet stator assembly 3 and the radial magnetic bearing seat 4, the motor chamber and the impeller chamber can be connected, so that the cooling air duct will not be blocked, that is, the cooling air can flow along the ventilation structure 13 in the motor chamber and the impeller chamber.

[0057] With such an arrangement, on the one hand, the high-temperature working medium can be ventilated and cooled through the ventilation structure 13. In addition, the high-speed operation of the rotor in the motor chamber and the increase in wind friction loss will cause the temperature of the motor chamber to further increase. By setting up the ventilation structure 13, the temperature of the radial electromagnet stator assembly 3 caused by the increase in the temperature of the motor chamber can be avoided from being too high.

[0058] On the other hand, for Freon-like working fluids that cannot be discharged directly, the Freon used for cooling in the motor chamber and the Freon leaked from the impeller volute need to be recovered through pipelines. By establishing a channel (ventilation structure 13) inside the motor chamber and the impeller chamber, the external pipeline connection can be effectively simplified and the Freon-like working fluid can be effectively collected.

[0059] In summary, the encapsulated radial magnetic bearing ventilation and heat dissipation structure provided by the present invention can effectively ventilate and dissipate heat when at least one of the electromagnet or sensor is encapsulated. Moreover, this device can effectively simplify the external pipeline for collecting Freon-like working fluids, and only one set of pipelines is required to collect Freon-like working fluids.

[0060] In one embodiment, the ventilation structure 13 includes a heat dissipation groove 9 provided on the outer circumference of the stator core 7 of the radial electromagnet stator assembly 3; the ventilation structure 13 protecting the bearing bracket 1, the displacement sensor assembly 2 and the radial magnetic bearing seat 4 includes ventilation holes 11 arranged at the position corresponding to the heat dissipation groove 9. The structure is shown in Figures 1 to 3, and the black block in the figure is the thermal conductive potting glue 8 for potting.

[0061] That is, holes can be punched out of the outer periphery of the stator core 7 to form heat dissipation slots 9. These slots must avoid interfering with the magnetic circuit structure of the electromagnet. Furthermore, ventilation holes 11 can be provided at corresponding locations of the protective bearing bracket 1, displacement sensor assembly 2, and radial magnetic bearing seat 4 to connect the motor chamber with the impeller chamber.

[0062] In one embodiment, the heat dissipation slot 9 is provided between two adjacent magnetic pole pairs, and the adjacent magnetic poles in the two magnetic pole pairs are like-named magnetic poles. Since no magnetic field will pass through the area between the two like-named magnetic poles, slotting between the two adjacent magnetic pole pairs, and at the positions where the adjacent magnetic poles in the two magnetic pole pairs are like-named magnetic poles, will not affect the magnetic circuit structure of the electromagnet. In addition, when potting the heat dissipation slot 9 of the radial electromagnet stator assembly 3 corresponding to the displacement sensor assembly 2, a potting hole is reserved to ensure that the sensor probe wiring of the displacement sensor assembly 2 is staggered with the hole position.

[0063] In one embodiment, the number of heat sinks 9 is the same as the number of magnetic pole pairs. As shown in FIG2 , the number of heat sinks 9 and magnetic pole pairs is four, and the heat sinks 9 do not affect the magnetic circuit of the radial electromagnet stator assembly 3. Of course, the number of heat sinks 9 and magnetic pole pairs can also be set to three or five, etc., that is, the heat sinks 9 and magnetic pole pairs need to be distributed in a corresponding manner. However, the specific shape, position, and number of the heat sinks 9 and magnetic pole pairs can be determined in actual use according to actual conditions and actual needs.

[0064] In one embodiment, the heat dissipation slot 9 is provided at the yoke portion between two adjacent magnetic poles of the same name, and the heat dissipation slot 9 is located in an area that bypasses the magnetic circuit of the radial electromagnet stator assembly 3 .

[0065] It should be noted that the heat sink 9 can be located not only between two like-named magnetic poles but also in the yoke between two adjacent like-named magnetic poles. However, in this case, the size of the heat sink 9 must be carefully designed to prevent it from affecting the magnetic circuit. Furthermore, when potting the heat sink 9 of the radial electromagnet stator assembly 3 with the displacement sensor assembly 2, a potting hole is reserved to ensure that the sensor probe wiring of the displacement sensor assembly 2 is staggered from the hole position.

[0066] In one embodiment, two adjacent electromagnet coils 6 of the radial electromagnet stator assembly 3 and the yoke portion of the stator core 7 form a triangular gap area, and the ventilation structure 13 includes a heat dissipation hole 10 arranged in the triangular gap area 12; the ventilation structure 13 that protects the bearing bracket 1, the displacement sensor assembly 2 and the radial magnetic bearing seat 4 includes ventilation holes 11 arranged at the positions corresponding to the heat dissipation holes 10.

[0067] It should be noted that the triangular gap area 12 formed by the yoke part of the two adjacent electromagnet coils 6 and the stator core 7 will not have a magnetic path passing through it, which can achieve ventilation and avoid affecting the radial electromagnet stator assembly 3. When making the heat dissipation hole 10, a cylindrical tube can be used in the triangular gap area 12, and then the triangular gap area 12 can be potted to obtain a heat dissipation hole 10 that is located at the desired position and meets the size requirements. In this case, the ventilation holes 11 that protect the bearing bracket 1, the displacement sensor assembly 2 and the radial magnetic bearing seat 4 also need to be synchronously adjusted to the position of the heat dissipation hole 10 so that the ventilation holes 11 and the heat dissipation holes 10 are aligned and connected.

[0068] In one embodiment, the heat dissipation hole 10 is provided on one side of the triangular gap area 12 close to the stator core 7, and the structure is shown in FIG4 to FIG6 , where the black block is the thermally conductive potting glue 8;

[0069] Or the heat dissipation hole 10 is provided on one side of the triangular gap area 12 close to the motor rotor 5 , and the structure is shown in FIG7 to FIG9 , in which the black block is the heat-conducting potting glue 8 .

[0070] That is, the position of the heat dissipation hole 10 can be adjusted within the triangular gap area 12 to achieve ventilation and heat dissipation without affecting the magnetic circuit of the radial electromagnet stator assembly 3 .

[0071] In addition to the aforementioned potted radial magnetic bearing ventilation and heat dissipation structure, the present invention further provides a magnetic bearing assembly including the potted radial magnetic bearing ventilation and heat dissipation structure disclosed in the aforementioned embodiments. The magnetic bearing assembly includes any of the aforementioned potted radial magnetic bearing ventilation and heat dissipation structures and a power unit, wherein the motor rotor 5 of the potted radial magnetic bearing ventilation and heat dissipation structure is connected to the power unit. The structures of the other components of the magnetic bearing assembly are referenced to the prior art and will not be further described herein.

[0072] In addition, it should be noted that the orientation or positional relationship indicated by "inside and outside" etc. in the present invention is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the purpose of simplifying the description and facilitating understanding, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0073] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other. Any combination of all the embodiments provided by the present invention is within the scope of protection of this invention and will not be described in detail here.

[0074] The above is a detailed introduction to the magnetic bearing device and the encapsulated radial magnetic bearing ventilation and heat dissipation structure provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, the present invention can also be improved and modified in several ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A ventilation and heat dissipation structure for a potted radial magnetic bearing, characterized in that, Comprising: A protective bearing bracket (1); A displacement sensor assembly (2); A radial electromagnet stator assembly (3); A radial magnetic bearing housing (4); A motor rotor (5), wherein the protective bearing bracket (1), the displacement sensor assembly (2), the radial electromagnet stator assembly (3) and the radial magnetic bearing housing (4) are sequentially sleeved on the outer peripheral part of the motor rotor (5), and at least one of the radial electromagnet stator assembly (3) and the displacement sensor assembly (2) is provided with a thermally conductive potting adhesive (8); The protective bearing bracket (1), the displacement sensor assembly (2), the radial electromagnet stator assembly (3) and the radial magnetic bearing housing (4) are correspondingly provided with a ventilation structure (13) to communicate the motor chamber and the impeller chamber.

2. The ventilation and heat dissipation structure for a potted radial magnetic bearing according to claim 1, characterized in that, The ventilation structure (13) includes heat dissipation grooves (9) provided on the outer circumferential part of the stator core (7) of the radial electromagnet stator assembly (3); The ventilation structures (13) of the protective bearing bracket (1), the displacement sensor assembly (2) and the radial magnetic bearing housing (4) include ventilation holes (11) provided at positions corresponding to the heat dissipation grooves (9).

3. The ventilation and heat dissipation structure for a potted radial magnetic bearing according to claim 2, characterized in that, The heat dissipation grooves (9) are provided between two adjacent pole pairs, and the adjacent magnets in the two pole pairs are like-named poles.

4. The ventilation and heat dissipation structure for a potted radial magnetic bearing according to claim 3, characterized in that, The number of the heat dissipation grooves (9) is the same as the number of the pole pairs.

5. The ventilation and heat dissipation structure for a potted radial magnetic bearing according to claim 2, characterized in that, The heat dissipation grooves (9) are provided at the yoke part between two adjacent like-named poles, and the heat dissipation grooves (9) are located in an area bypassing the magnetic circuit of the radial electromagnet stator assembly (3).

6. The ventilation and heat dissipation structure for a potted radial magnetic bearing according to claim 1, characterized in that, An adjacent two electromagnet coils (6) of the radial electromagnet stator assembly (3) and the yoke part of the stator core (7) form a triangular gap area, and the ventilation structure (13) includes heat dissipation holes (10) provided in the triangular gap area (12); The ventilation structures (13) of the protective bearing bracket (1), the displacement sensor assembly (2) and the radial magnetic bearing housing (4) include ventilation holes (11) provided at positions corresponding to the heat dissipation holes (10).

7. The ventilation and heat dissipation structure for a potted radial magnetic bearing according to claim 6, characterized in that, The heat dissipation holes (10) are provided on one side of the triangular gap area (12) close to the stator core (7); Or the heat dissipation holes (10) are provided on one side of the triangular gap area (12) close to the motor rotor (5).

8. A magnetic bearing device, characterized in that, Comprising the potting radial magnetic bearing ventilation and heat dissipation structure and the power device according to any one of claims 1 to 7 above, wherein the motor rotor (5) of the potting radial magnetic bearing ventilation and heat dissipation structure is connected to the power device.

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