Cooling mode of radial magnetic bearing

Abstract

The invention belongs to the technical field of radial magnetic bearings, particularly relates to a cooling method of a radial magnetic bearing, and aims to solve the problem of poor heat dissipation of the radial magnetic bearing in the background technology, and provides the following scheme: the radial magnetic bearing comprises a shell, a shell structure is arranged on one side of the shell, and an inner shaft structure is arranged in the shell structure; a top cover and a bottom cover are arranged at the top and the bottom of the shell structure correspondingly, flow guide pipes which are symmetrically distributed are welded to the outer wall of the top of the top cover, and a flow guide hole is formed in the outer wall of one side of the bottom cover. When air circulation is ensured, air flow passes through the magnetic bearing of the generator, the reliability of the radial magnetic bearing of the generator changed from conduction heat dissipation to convection heat dissipation can be effectively verified through fluid and temperature field simulation check, different from heat conduction of a traditional magnetic bearing by means of pouring glue, the ventilation effect of the magnetic bearing is better, and therefore the magnetic bearing is designed to be light in weight and low in cost. The radial magnetic bearing is simple and compact in structure, convenient to assemble and safe in operation, and has reference significance for lightweight design of other radial magnetic bearings.

Description

Technical Field

[0001] The present invention relates to the technical field of radial magnetic bearings, and in particular to a cooling method for radial magnetic bearings. Background Art

[0002] Radial magnetic bearings are based on the rotor position information fed back by the displacement sensor. By adjusting the input current of the four branches to the stator coil of the magnetic axis, the electromagnetic force of each branch is adjusted to suspend the rotor in the air. Compared with traditional contact rolling bearings or sliding bearings, radial magnetic bearings have the advantages of low vibration, low noise, low wear, and no oil pollution. Therefore, it has become a trend to replace traditional bearings in high-speed motors with radial magnetic bearings.

[0003] Since radial magnetic bearings adjust the input current of the four branch paths to the magnetic shaft stator coils, and then adjust the electromagnetic force of each branch to suspend the rotor in the air, and magnetic bearings generally require small size, large speed and load-bearing capacity, the heat source is concentrated and heat dissipation is difficult. At present, the stators of domestic magnetic bearings are mainly cast in glue, and the coils are in the casting glue. Heat dissipation depends more on the thermal conductivity of the casting glue itself. However, the thermal conductivity of the current casting glue is generally poor, resulting in poor heat dissipation of the magnetic bearing and high temperature of the magnetic bearing. Therefore, designing a good magnetic bearing cooling system becomes the key to solving the problem. Summary of the invention

[0004] In view of the deficiencies of the prior art, the present invention provides a cooling method for a radial magnetic bearing, which overcomes the deficiencies of the prior art and effectively solves the problem of poor heat dissipation of the radial magnetic bearing.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A cooling method for a radial magnetic bearing, comprising a casing, a shell structure is arranged on one side of the casing, an inner shaft structure is arranged inside the shell structure, a top cover and a bottom cover are arranged on the top and bottom of the shell structure respectively, and a symmetrically distributed flow guide pipe is welded on the top outer wall of the top cover, and a flow guide hole is opened on the outer wall of one side of the bottom cover;

[0007] A cover plate is arranged on the top of the inner shaft structure, and a stator pressure ring is arranged on the inner wall of the cover plate, a magnetic bearing stator is arranged on the inner wall of the stator pressure ring, and a magnetic bearing rotor is arranged on the bottom of the magnetic bearing stator, a magnetic bearing spoke is fixedly connected to the outer wall of the magnetic bearing rotor, and an output shaft is arranged on the magnetic bearing stator and the inner wall of the magnetic bearing rotor.

[0008] Through the above scheme, the traditional glue pouring process is cancelled and replaced with a paint dipping process to ensure the insulation performance of the magnetic bearing. At the same time, the support seat of the magnetic bearing is designed as a ventilated structure, and the magnetic bearing is installed at the air inlet of the generator to ensure that the air flows through the magnetic bearing of the generator during air circulation. Through fluid and temperature field simulation verification, it can be effectively verified that the radial magnetic bearing of the generator changes from conduction heat dissipation to convection heat dissipation. Different from the traditional magnetic bearing that relies on heat conduction of casting glue, the magnetic bearing has better ventilation effect. Therefore, the magnetic bearing is designed to be lightweight, simple and compact in structure, easy to assemble, and safe in operation, which has reference significance for the lightweight design of other radial magnetic bearings.

[0009] Preferably, the bottom cover is welded to the bottom outer wall of the top cover.

[0010] Preferably, the cover plate is fixedly connected to the top inner wall of the top cover.

[0011] Preferably, the output shaft is arranged to penetrate inside the housing structure.

[0012] Preferably, the outer wall of the bottom cover is fixedly connected with a fixed bottom ring by bolts, and the fixed bottom ring is welded to the top outer wall of the casing.

[0013] Preferably, symmetrically distributed fixing plates are welded to the outer wall of the top of the cover plate, and the flow guide pipe is fixedly connected to the inner wall of the fixing plate.

[0014] Preferably, an axial flow fan cover is welded to the top outer wall of the casing, and an air guide body is welded to the top outer wall of the axial flow fan cover, and an axial flow fan is arranged inside the axial flow fan cover.

[0015] The beneficial effects of the present invention are:

[0016] 1. The cooling method of the radial magnetic bearing of the present invention cancels the traditional glue filling process and replaces it with a varnish dipping process to ensure the insulation performance of the magnetic bearing. At the same time, the support seat of the magnetic bearing is designed as a ventilation structure, and the magnetic bearing is installed at the air inlet of the generator to ensure that the air flows through the magnetic bearing of the generator. Through fluid and temperature field simulation verification, the reliability of the generator radial magnetic bearing changing from conduction heat dissipation to convection heat dissipation can be effectively verified;

[0017] 2. The cooling method of the radial magnetic bearing of the present invention is different from that of the traditional magnetic bearing which relies on heat conduction of the casting glue, so that the ventilation effect of the magnetic bearing is better. Therefore, the magnetic bearing is lightweight in design, simple and compact in structure, easy to assemble, and safe in operation, which has reference significance for the lightweight design of other radial magnetic bearings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the overall structure of a cooling method for a radial magnetic bearing proposed by the present invention;

[0019] Figure 2 A schematic diagram of the outer shell structure and inner shaft structure of a cooling method of a radial magnetic bearing proposed by the present invention;

[0020] Figure 3 A schematic diagram of the housing structure of a cooling method for a radial magnetic bearing proposed by the present invention;

[0021] Figure 4 A schematic diagram of the inner shaft structure of a cooling method of a radial magnetic bearing proposed by the present invention;

[0022] Figure 5 A schematic diagram of the connection between a magnetic bearing stator and a magnetic bearing rotor in a cooling method of a radial magnetic bearing proposed by the present invention;

[0023] Figure 6 A schematic diagram of wind flow direction for a cooling method of a radial magnetic bearing proposed by the present invention.

[0024] In the figure: 1. casing; 2. outer shell structure; 3. inner shaft structure; 4. top cover; 5. bottom cover; 6. air guide pipe; 7. air guide hole; 8. cover plate; 9. stator pressure ring; 10. magnetic bearing stator; 11. magnetic bearing rotor; 12. magnetic bearing spoke; 13. output shaft; 14. fixed bottom ring; 15. fixed plate; 16. axial flow fan cover; 17. air guide body. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0026] Embodiment 1, refer to Figures 1 to 3 A cooling method for a radial magnetic bearing includes a casing 1, a shell structure 2 is provided on one side of the casing 1, and an inner shaft structure 3 is provided inside the shell structure 2, a top cover 4 and a bottom cover 5 are provided on the top and bottom of the shell structure 2 respectively, and a symmetrically distributed flow guide pipe 6 is welded on the top outer wall of the top cover 4, and a flow guide hole 7 is opened on the outer wall of one side of the bottom cover 5.

[0027] In this embodiment, the traditional glue potting process is cancelled and replaced with a paint dipping process to ensure the insulation performance of the magnetic bearing. At the same time, the support seat of the magnetic bearing is designed as a ventilated structure, and the magnetic bearing is installed at the air inlet of the generator to ensure that the air flows through the magnetic bearing of the generator during air circulation. Through fluid and temperature field simulation verification, the reliability of changing the radial magnetic bearing of the generator from conduction heat dissipation to convection heat dissipation can be effectively verified.

[0028] Example 2, refer to Figures 4 to 6A cooling method for a radial magnetic bearing, wherein a cover plate 8 is arranged on the top of the inner shaft structure 3, and a stator pressure ring 9 is arranged on the inner wall of the cover plate 8, a magnetic bearing stator 10 is arranged on the inner wall of the stator pressure ring 9, and a magnetic bearing rotor 11 is arranged on the bottom of the magnetic bearing stator 10, a magnetic bearing spoke 12 is fixedly connected to the outer wall of the magnetic bearing rotor 11, and an output shaft 13 is arranged on the inner walls of the magnetic bearing stator 10 and the magnetic bearing rotor 11.

[0029] In this embodiment, unlike traditional magnetic bearings that rely on heat conduction of casting glue, the magnetic bearings have better ventilation effect. Therefore, the magnetic bearings are lightweight in design, simple and compact in structure, easy to assemble, and safe in operation, which has reference significance for the lightweight design of other radial magnetic bearings.

[0030] Reference Figure 3 The bottom cover 5 is welded to the bottom outer wall of the top cover 4 .

[0031] Reference Figure 4 The cover plate 8 is fixedly connected to the top inner wall of the top cover 4.

[0032] Reference Figures 2 to 4 The output shaft 13 is arranged to penetrate the interior of the housing structure 2 .

[0033] Reference Figure 3 The outer wall of the bottom cover 5 is fixedly connected with a fixed bottom ring 14 by bolts, and the fixed bottom ring 14 is welded to the top outer wall of the casing 1.

[0034] Reference Figure 4 The top outer wall of the cover plate 8 is welded with symmetrically distributed fixing plates 15 , and the guide pipe 6 is fixedly connected to the inner wall of the fixing plate 15 .

[0035] Reference Figure 1 An axial flow fan cover 16 is welded to the top outer wall of the casing 1 , and an air guide 17 is welded to the top outer wall of the axial flow fan cover 16 , and an axial flow fan is arranged inside the axial flow fan cover 16 .

[0036] Working principle: The housing structure 2 serves as the support structure of the magnetic bearing, the magnetic bearing stator 10 is installed in the housing structure 2 and axially fixed by the stator pressure ring 9, the magnetic bearing rotor 11 is installed on the magnetic bearing spoke 12, and the generator air guide 17 and the generator axial flow fan are on the right side of the housing structure 2;

[0037] When the generator rotor rotates, the generator axial fan inside the axial fan cover 16 provides a wind pressure source, and a guide duct 6 is designed on the upper circle of the outer shell structure 2. The wind flow can enter the inner part of the outer shell structure 2 to provide heat dissipation, and the heat can be discharged through the guide hole 7.

[0038] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0039] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0040] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for cooling a radial magnetic bearing, comprising a housing (1), characterized in that: An outer shell structure (2) is provided on one side of the housing (1), and an inner shaft structure (3) is provided inside the outer shell structure (2); a top cover (4) and a bottom cover (5) are provided on the top and bottom of the outer shell structure (2), respectively; a symmetrically distributed flow guide pipe (6) is welded to the top outer wall of the top cover (4), and a flow guide hole (7) is provided on the outer wall of one side of the bottom cover (5); A cover plate (8) is arranged on the top of the inner shaft structure (3), and a stator pressure ring (9) is arranged on the inner wall of the cover plate (8), a magnetic bearing stator (10) is arranged on the inner wall of the stator pressure ring (9), and a magnetic bearing rotor (11) is arranged at the bottom of the magnetic bearing stator (10), a magnetic bearing spoke (12) is fixedly connected to the outer wall of the magnetic bearing rotor (11), and an output shaft (13) is arranged on the inner walls of the magnetic bearing stator (10) and the magnetic bearing rotor (11).

2. A cooling method for a radial magnetic bearing according to claim 1, characterized in that: The bottom cover (5) is welded to the bottom outer wall of the top cover (4).

3. A cooling method for a radial magnetic bearing according to claim 1, characterized in that: The cover plate (8) is fixedly connected to the top inner wall of the top cover (4).

4. A cooling method for a radial magnetic bearing according to claim 1, characterized in that: The output shaft (13) is arranged to penetrate the interior of the outer shell structure (2).

5. A cooling method for a radial magnetic bearing according to claim 1, characterized in that: The outer wall of the bottom cover (5) is fixedly connected to a fixed bottom ring (14) by means of bolts, and the fixed bottom ring (14) is welded to the top outer wall of the casing (1).

6. A cooling method for a radial magnetic bearing according to claim 1, characterized in that: The top outer wall of the cover plate (8) is welded with symmetrically distributed fixing plates (15), and the flow guide pipe (6) is fixedly connected to the inner wall of the fixing plate (15).

7. A cooling method for a radial magnetic bearing according to claim 1, characterized in that: An axial flow fan cover (16) is welded to the top outer wall of the casing (1), and an air guide (17) is welded to the top outer wall of the axial flow fan cover (16), and an axial flow fan is arranged inside the axial flow fan cover (16).

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