Magnetic suspension bearing and magnetic suspension rotating machine

Abstract

The utility model provides a magnetic suspension bearing and magnetic suspension rotating machinery, the magnetic suspension bearing includes: axial stator no. 1, axial stator no. 2 and thrust disc, in the axial direction of magnetic suspension bearing, the thrust disc is provided between axial stator no. 1 and axial stator no. The first radial outer side part and the first radial inner side part are arranged at intervals in the radial direction of the first axial stator, a first coil groove is formed between the first radial outer side part and the first radial inner side part, a first coil is arranged in the first coil groove, and a first pressing plate ventilation hole is formed in the first pressing plate from one axial end face to the other axial end face in a penetrating mode. The vent hole of the first pressing plate is opposite to the position of the first coil groove in the axial direction, and the vent hole of the first pressing plate is not opposite to the magnetic pole position of the first axial stator. According to the magnetic suspension bearing, heat dissipation and cooling of the magnetic suspension bearing are improved, meanwhile, influence on a magnetic suspension magnetic circuit can be avoided, and enough magnetic suspension supporting force is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of magnetic levitation bearings, in particular to a magnetic levitation bearing and a magnetic levitation rotating machine. Background Art

[0002] At present, the heat dissipation of magnetic levitation rotating machines mainly relies on external cooling equipment, usually including external cooling fans, water cooling systems, heat exchangers, etc. The equipment maintenance cost is high, the structure system is complex, and potential safety hazards are increased. Or in the form of negative pressure, air is sucked from the magnetic levitation rotating machine to guide heat out, which cannot more effectively achieve the heat dissipation of internal components, especially the heat dissipation of axial magnetic bearings is insufficient, affecting the stable operation of magnetic levitation air compressors.

[0003] The axial magnetic bearing realizes the axial movement of the rotating shaft. An essential axial force-bearing component on the rotating shaft is the thrust disk. The axial magnetic bearing and the thrust disk are made of a pure iron solid structure, with relatively large self-loss, general thermal conductivity, and narrow space. If not effectively cooled, they will generate serious heat. Usually, in order to avoid excessive temperature rise of the axial magnetic bearing, forced air cooling is often applied externally to dissipate heat from the magnetic bearing. The cooling air is input from the outside and passes through the gap between the bearing stator and the thrust disk to dissipate heat from the axial magnetic bearing, but the heat dissipation efficiency is not high.

[0004] Due to the technical problems such as poor cooling and heat dissipation of the magnetic levitation bearings inside the rotating machines in the prior art, the utility model researches and designs a magnetic levitation bearing and a magnetic levitation rotating machine. Summary of the Utility Model

[0005] Therefore, the technical problem to be solved by the utility model is to overcome the defect of poor cooling and heat dissipation of the magnetic levitation bearings inside the rotating machines in the prior art, so as to provide a magnetic levitation bearing and a magnetic levitation rotating machine.

[0006] To solve the above problems, the utility model provides a magnetic levitation bearing, which includes:

[0007] An axial stator one, an axial stator two, and a thrust disk. In the axial direction of the magnetic levitation bearing, the thrust disk is arranged between the axial stator one and the axial stator two. The axial stator one includes a radial outer part one and a radial inner part one. The radial outer part one and the radial inner part one are spaced apart in the radial direction of the axial stator one, and a coil slot one is formed therebetween. A coil one is arranged in the coil slot one;

[0008] It further includes a first pressing plate, which is located between the first axial stator and the thrust disc. One axial end face of the first pressing plate is in contact with the first radial outer part of the first axial stator, and the other axial end face of the first pressing plate faces the thrust disc. A ventilation hole of the first pressing plate runs through the first pressing plate from its one axial end face to the other axial end face. The ventilation hole of the first pressing plate is axially aligned with the first coil slot, and the ventilation hole of the first pressing plate is not axially aligned with the magnetic pole position of the first axial stator.

[0009] In some embodiments,

[0010] The magnetic pole position of the first axial stator includes the part of the first pressing plate facing the thrust disc and the part of the first radial inner part facing the thrust disc. The outer peripheral wall of the thrust disc is located at a position opposite to the inner peripheral wall and the outer peripheral wall of the first pressing plate in the radial direction. The ventilation hole of the first pressing plate is located on the outer periphery of the part of the first pressing plate facing the thrust disc. The outer periphery of the thrust disc forms an air flow space, and the air flow space is communicated with the ventilation hole of the first pressing plate.

[0011] In some embodiments,

[0012] There is a first gap between the first coil and the first radial outer part. The ventilation hole of the first pressing plate is axially aligned with the first gap, and the dimension of the first gap in the radial direction is greater than or equal to the radial dimension of the ventilation hole of the first pressing plate.

[0013] In some embodiments,

[0014] The first axial stator further includes a first axial outer part, which is arranged away from the thrust disc relative to the first coil in the axial direction of the magnetic suspension bearing. Inside the first coil slot, there is also a second gap between the first axial outer part and the first coil, forming a bearing stator ventilation slot one.

[0015] A bearing stator ventilation hole one is provided on the first axial outer part of the first axial stator. The bearing stator ventilation hole one runs through the first axial outer part from its one axial end face to the other axial end face to communicate with the bearing stator ventilation slot one, and further communicates with the ventilation hole of the first pressing plate through the first gap, and then communicates with the air flow space.

[0016] In some embodiments,

[0017] The second axial stator includes a second radial outer part and a second radial inner part. The second radial outer part and the second radial inner part are spaced apart in the radial direction of the second axial stator, and a second coil slot is formed therebetween, and a second coil is arranged in the second coil slot.

[0018] It further includes a second pressing plate, the second pressing plate is located between the axial stator two and the thrust disc, and one axial end face of the second pressing plate is in contact with the second radial outer part of the axial stator two, and the other axial end face of the second pressing plate faces the thrust disc; a ventilation hole of the second pressing plate is provided through the second pressing plate from one axial end face to the other axial end face, the ventilation hole of the second pressing plate is axially opposite to the position of the coil slot two, and the ventilation hole of the second pressing plate is not axially opposite to the magnetic pole position of the axial stator two.

[0019] In some embodiments,

[0020] The magnetic pole position of the axial stator two includes the part where the second pressing plate faces the thrust disc and the part where the second radial inner part faces the thrust disc, the radially outer peripheral wall of the thrust disc is located at a position opposite to the position between the radially inner peripheral wall and the radially outer peripheral wall of the second pressing plate, the ventilation hole of the second pressing plate is located on the outer periphery of the part where the second pressing plate faces the thrust disc, the outer periphery of the thrust disc forms an air flow passage space, and the air flow passage space is communicated with the ventilation hole of the second pressing plate.

[0021] In some embodiments,

[0022] There is a third gap between the coil two and the second radial outer part, the ventilation hole of the second pressing plate is axially opposite to the third gap, and the dimension of the third gap in the radial direction is greater than or equal to the radial dimension of the ventilation hole of the second pressing plate.

[0023] In some embodiments,

[0024] The axial stator two further includes an axial outer part two, the axial outer part two is arranged away from the thrust disc relative to the coil two in the axial direction of the magnetic suspension bearing, and there is also a fourth gap between the axial outer part two and the coil two inside the coil slot two, forming a bearing stator ventilation slot two;

[0025] A bearing stator ventilation hole two is provided on the axial outer part two of the axial stator two, and the bearing stator ventilation hole two penetrates from one axial end face to the other axial end face of the axial outer part two to communicate with the bearing stator ventilation slot two, and further communicates with the ventilation hole of the second pressing plate through the third gap, and then communicates with the air flow passage space.

[0026] In some embodiments,

[0027] A thrust disk ventilation hole is provided through the thrust disk from one axial end face to the other axial end face. In the axial direction, the thrust disk ventilation hole is located at a position opposite to the gap between the radial inner circumference of the first radial inner part and the rotor, and the thrust disk ventilation hole is not opposite to the magnetic pole position of the first axial stator; in the axial direction, the thrust disk ventilation hole is also located at a position opposite to the gap between the radial inner circumference of the second radial inner part and the rotor, and the thrust disk ventilation hole is not opposite to the magnetic pole position of the second axial stator.

[0028] In some embodiments,

[0029] The aperture of the thrust disk ventilation hole < the radial distance between the first radial inner part and the rotor, and the aperture of the thrust disk ventilation hole < the radial distance between the second radial inner part and the rotor.

[0030] In some embodiments,

[0031] Along the axial direction of the thrust disk, the thrust disk ventilation hole is an inclined hole structure whose extending direction is not parallel to the axis of the thrust disk. From the observation direction of the axial end face of the intake side of the thrust disk towards the axial end face of the outlet side, the rotation direction of the thrust disk is the first rotation direction, and the extending direction of the thrust disk ventilation hole from the axial end face of the intake side of the thrust disk towards the axial end face of the outlet side is towards the second rotation direction, and the second rotation direction is opposite to the first rotation direction.

[0032] In some embodiments,

[0033] The thrust disk ventilation holes are multiple, and the multiple thrust disk ventilation holes are arranged at intervals along the circumferential direction of the thrust disk, and the extending direction of each thrust disk ventilation hole from the axial end face of the intake side of the thrust disk towards the axial end face of the outlet side is towards the second rotation direction, and is opposite to the first rotation direction of the thrust disk.

[0034] The present utility model also provides a magnetic levitation rotating machine, which includes the aforementioned magnetic levitation bearing.

[0035] A magnetic levitation bearing and a magnetic levitation rotating machine provided by the present utility model have the following beneficial effects:

[0036] 1. The utility model can introduce cooling air into the stator interior through the vent holes on the first pressing plate to cool the stator, improving the cooling and heat dissipation effect of the magnetic levitation bearing. Moreover, the vent holes on the first pressing plate are not opposite to the magnetic pole positions of the axial stator 1, enabling the first pressing plate not to have holes at the positions directly opposite the magnetic pole positions, so that the cooling air cannot directly reach the magnetic pole gap position, effectively avoiding the influence of the cooling gas and the holes on the magnetic furnace structure, thus avoiding insufficient magnetic levitation axial supporting force. While achieving improved heat dissipation and cooling of the magnetic levitation bearing, it can also avoid affecting the magnetic levitation magnetic circuit, ensuring sufficient magnetic levitation supporting force and effectively reducing the influence of gas force on the axial force. The utility model also preferably sets the vent holes on the first pressing plate at positions opposite to the outer circumference of the thrust disc, and the aperture size of the vent holes on the first pressing plate ≤ the radial distance between the coil and the stator core, which can further effectively avoid the vent holes on the first pressing plate from the magnetic pole positions, further avoiding affecting the magnetic circuit. Moreover, the vent holes on the thrust disc are connected to the ventilation paths at both ends without obstruction, and the air flow resistance at both ends of the thrust disc is small, with good fluidity.

[0037] 2. The utility model can achieve self - active air - suction heat exchange through the vent holes on the thrust disc at high rotational speeds, increasing the gas flow rate introduced, accelerating the cooling of the axial magnetic bearing, actively cooling the thrust disc itself and increasing the cooling flow rate to accelerate the heat dissipation of the axial coil, improving the cooling and heat dissipation effect of the magnetic levitation bearing. Moreover, the vent holes on the thrust disc are not opposite to the magnetic pole positions of the axial stator 1 and 2, enabling the end face of the thrust disc not to have holes at the positions directly opposite the magnetic pole positions, so that the cooling air cannot directly reach the magnetic pole gap position, effectively avoiding the influence of the cooling gas and the holes on the magnetic furnace structure, thus avoiding insufficient magnetic levitation axial supporting force. While achieving improved heat dissipation and cooling of the magnetic levitation bearing, it can also avoid affecting the magnetic levitation magnetic circuit, ensuring sufficient magnetic levitation supporting force and effectively reducing the influence of gas force on the axial force. The utility model also preferably sets the vent holes on the thrust disc at the gap between the lower axial magnetic pole and the rotor, and the aperture size ≤ the radial distance between the lower axial magnetic pole of the stator and the rotor, which can further effectively avoid the vent holes on the thrust disc from the magnetic pole positions, further avoiding affecting the magnetic circuit. Moreover, the vent holes on the thrust disc are connected to the ventilation paths at both ends without obstruction, and the air flow resistance at both ends of the thrust disc is small, with good fluidity.

[0038] 3. The present utility model also sets the ventilation holes of the thrust disk to extend from one axial end face to the other axial end face in a direction towards the second rotation direction, and the second rotation direction is opposite to the first rotation direction (the rotation direction of the thrust disk). When the rotor drives the thrust disk to rotate at a high speed, negative pressure can be generated to suck out the hot air at one end and discharge it to the outside, increasing the gas flow rate, realizing the active ventilation and heat exchange of the thrust disk itself, accelerating the gas flow, saving energy consumption, improving the heat dissipation performance and at the same time improving the energy efficiency. At the same time, in cooperation with the bearing stator ventilation holes and ventilation grooves (multiple gas flow paths) in the axial stator coil slots, the gas flow in the cavity of the axial stator coil slots can be further accelerated, realizing the effective independent heat dissipation of the axial coil and the thrust disk. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 is a longitudinal sectional view of Embodiment 1 of the magnetic suspension bearing of the present utility model;

[0040] Figure 2 is Figure 1 the plan structure diagram of the thrust disk structure in

[0041] Figure 3 is a longitudinal sectional view of Embodiment 2 of the magnetic suspension bearing of the present utility model;

[0042] Figure 4 is Figure 3 the plan structure diagram of the thrust disk structure in

[0043] Figure 5 is the three-dimensional structure diagram of the axial stator one of the present utility model.

[0044] The reference numerals are shown as:

[0045] 1. Axial stator one; 11. Radial outer part one; 12. Radial inner part one; 13. Coil slot one; 14. Axial outer part one; 2. Axial stator two; 21. Radial outer part two; 22. Radial inner part two; 23. Coil slot two; 24. Axial outer part two; 3. Thrust disk; 4. Press plate one; 4'. Press plate two; 5. Coil one; 5'. Coil two; 6. Rotor;

[0046] 01. Thrust disk ventilation hole; 02. Air flow space; 03. Bearing stator ventilation hole one; 03'. Bearing stator ventilation hole two; 04. Bearing stator ventilation groove one; 04'. Bearing stator ventilation groove two; 05. Press plate one ventilation hole; 05'. Press plate two ventilation hole; 06. First gap; 06'. Third gap. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0047] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way limits the present utility model and its application or use. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

[0048] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0049] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps described in these embodiments do not limit the scope of the present utility model. At the same time, it should be understood that for the sake of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and devices should be regarded as part of the authorized specification. In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0050] In the description of the present utility model, it should be understood that the orientation or positional relationships indicated by orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal", and "top, bottom" are generally based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Without contrary description, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus cannot be construed as limiting the scope of protection of the present utility model; the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0051] For ease of description, spatial relative terms, such as "above", "over", "on the upper surface", "upper", etc., can be used here to describe the spatial positional relationship of a device or feature shown in the figure with other devices or features. It should be understood that the spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figure. For example, if the device in the drawing is inverted, a device described as "above" or "over" other devices or structures will then be positioned "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the corresponding interpretations of the spatial relative descriptions used here will be made accordingly.

[0052] In addition, it should be noted that the use of terms such as "first" and "second" to define components is only for the convenience of distinguishing the corresponding components. Without additional statements, the above terms have no special meanings, so they should not be construed as limiting the protection scope of the present utility model.

[0053] As Figures 1-5 shown, the present utility model provides a magnetic levitation bearing, which includes:

[0054] Axial stator one 1, axial stator two 2 and thrust disk 3. In the axial direction of the magnetic levitation bearing, the thrust disk 3 is arranged between the axial stator one 1 and the axial stator two 2. A thrust disk ventilation hole 01 is provided through the thrust disk 3 from one axial end face to the other axial end face. The axial stator one 1 includes a radially outer part one 11 and a radially inner part one 12. The radially outer part one 11 and the radially inner part one 12 are spaced apart in the radial direction of the axial stator one 1, and a coil slot one 13 is formed therebetween. A coil one 5 is arranged in the coil slot one 13;

[0055] It further includes a pressing plate one 4. The pressing plate one 4 is located between the axial stator one 1 and the thrust disk 3. One axial end face of the pressing plate one 4 is in contact with the radially outer part one 11 of the axial stator one 1, and the other axial end face of the pressing plate one 4 faces the thrust disk 3. A pressing plate one ventilation hole 05 is provided through the pressing plate one 4 from one axial end face to the other axial end face. The pressing plate one ventilation hole 05 is axially opposite to the position of the coil slot one 13, and the pressing plate one ventilation hole 05 is not opposite to the magnetic pole position of the axial stator one 1.

[0056] Through the ventilation holes of the first pressure plate provided on the first pressure plate, the present utility model can introduce cooling air into the stator to cool the stator, improve the cooling and heat dissipation effect of the magnetic levitation bearing, and make the ventilation holes of the first pressure plate not opposite to the pole positions of the axial stator 1, so that the first pressure plate does not have holes at the positions directly opposite to the pole positions, preventing the cooling air from directly reaching the pole gap position, effectively avoiding the influence of the cooling gas and the holes on the magnetic furnace structure, thus avoiding insufficient magnetic levitation axial support force, achieving improved heat dissipation and cooling of the magnetic levitation bearing while avoiding affecting the magnetic levitation magnetic circuit, ensuring sufficient magnetic levitation support force, and effectively reducing the influence of gas force on the axial force; the present utility model also preferably sets the ventilation holes of the first pressure plate at positions opposite to the outer periphery of the thrust disk, and the aperture size of the ventilation holes of the first pressure plate ≤ the radial distance between the coil and the stator core, which can further effectively avoid the pole positions by the ventilation holes of the first pressure plate, further avoid affecting the magnetic circuit, and the ventilation holes of the thrust disk are connected to the ventilation paths at both ends without obstruction, and the air flow resistance at both ends of the thrust disk is small and the fluidity is good.

[0057] In some embodiments,

[0058] The pole positions of the axial stator 1 include the part of the first pressure plate 4 opposite to the thrust disk 3 and the part of the radially inner part 12 opposite to the thrust disk 3. The outer peripheral wall of the radially outer part of the thrust disk 3 is located at a position opposite to the inner peripheral wall and the outer peripheral wall of the first pressure plate 4. The ventilation holes 05 of the first pressure plate are located on the outer periphery of the part of the first pressure plate 4 opposite to the thrust disk 3. The outer periphery of the thrust disk 3 forms an air flow passage space 02, and the air flow passage space 02 is communicated with the ventilation holes 05 of the first pressure plate.

[0059] The present utility model also preferably sets the ventilation holes of the first pressure plate at positions opposite to the outer periphery of the thrust disk, which can further effectively avoid the pole positions by the ventilation holes of the first pressure plate, further avoid affecting the magnetic circuit, and the ventilation holes of the thrust disk are connected to the ventilation paths at both ends without obstruction, and the air flow resistance at both ends of the thrust disk is small and the fluidity is good.

[0060] In some embodiments,

[0061] There is a first gap 06 between the first coil 5 and the radially outer part 11. The ventilation holes 05 of the first pressure plate are opposite to the first gap 06 in the axial direction, and the dimension of the first gap 06 in the radial direction is greater than or equal to the radial dimension of the ventilation holes 05 of the first pressure plate.

[0062] The present utility model further preferably has the aperture size of the ventilation holes of the first pressing plate ≤ the radial distance between the coil and the stator core, which can further enable the ventilation holes of the first pressing plate to effectively avoid the pole positions, further avoid affecting the magnetic circuit, and the ventilation holes of the thrust disk are connected to the ventilation paths at both ends without obstruction, and can also make the air flow resistance at both ends of the thrust disk small and the fluidity good.

[0063] In some embodiments,

[0064] The first axial stator 1 further includes an outer axial portion 14 of the first axial stator. The outer axial portion 14 of the first axial stator is arranged away from the thrust disk 3 relative to the first coil 5 in the axial direction of the magnetic suspension bearing. Inside the first coil slot 13, there is also a second gap between the outer axial portion 14 of the first axial stator and the first coil 5, forming a first bearing stator ventilation slot 04.

[0065] The outer axial portion 14 of the first axial stator is provided with a first bearing stator ventilation hole 03. The first bearing stator ventilation hole 03 penetrates from one axial end face of the outer axial portion 14 to the other axial end face to communicate with the first bearing stator ventilation slot 04, and further communicates with the ventilation hole 05 of the first pressing plate through the first gap 06, and then communicates with the air flow space 02.

[0066] The present utility model further further accelerates the air flow in the cavity of the axial stator coil slot through the bearing stator ventilation holes and ventilation slots (multiple gas flow paths) arranged in the axial stator coil slot, realizing the effective independent heat dissipation of the axial coil and the thrust disk.

[0067] In some embodiments,

[0068] The second axial stator 2 includes a second outer radial portion 21 and a second inner radial portion 22. The second outer radial portion 21 and the second inner radial portion 22 are arranged at intervals in the radial direction of the second axial stator 2, and a second coil slot 23 is formed therebetween. A second coil 5' is arranged in the second coil slot 23.

[0069] It further includes a second pressing plate 4'. The second pressing plate 4' is located between the second axial stator 2 and the thrust disk 3. One axial end face of the second pressing plate 4' is connected to the second outer radial portion 21 of the second axial stator 2, and the other axial end face of the second pressing plate 4' faces the thrust disk 3. A second pressing plate ventilation hole 05' is penetrated from one axial end face to the other axial end face of the second pressing plate 4'. The second pressing plate ventilation hole 05' is opposite to the position of the second coil slot 23 in the axial direction, and the second pressing plate ventilation hole 05' is not opposite to the pole position of the second axial stator 2.

[0070] The present utility model further enables cooling air to be introduced into the stator interior through the vent holes of the second pressing plate, thereby cooling the stator, improving the cooling and heat dissipation effect of the magnetic levitation bearing, and making the vent holes of the second pressing plate not opposite to the pole positions of the axial stator two. This can prevent the second pressing plate from being perforated at the positions directly opposite to the pole positions, so that the cooling air cannot directly reach the pole gap position, effectively avoiding the influence of the cooling gas and the openings on the magnetic furnace structure, thus avoiding insufficient magnetic levitation axial support force, achieving improved heat dissipation and cooling of the magnetic levitation bearing while also avoiding affecting the magnetic levitation magnetic circuit, ensuring sufficient magnetic levitation support force, and effectively reducing the influence of gas force on the axial force.

[0071] In some embodiments,

[0072] The pole positions of the axial stator two 2 include the part of the second pressing plate 4' opposite to the thrust disc 3 and the part of the second radially inner part 22 opposite to the thrust disc 3. The radially outer peripheral wall of the thrust disc 3 is located at a position opposite to the position between the radially inner peripheral wall and the radially outer peripheral wall of the second pressing plate 4'. The vent holes 05' of the second pressing plate are located on the outer periphery of the part of the second pressing plate 4' opposite to the thrust disc 3. The outer periphery of the thrust disc 3 forms an air flow passage space 02, and the air flow passage space 02 is communicated with the vent holes 05' of the second pressing plate.

[0073] The present utility model also preferably sets the vent holes of the second pressing plate at a position opposite to the outer periphery of the thrust disc, which can further effectively avoid the pole positions by the vent holes of the second pressing plate, further avoid affecting the magnetic circuit, and the vent holes of the thrust disc are communicated with the ventilation paths at both ends without obstruction, and can also make the air flow resistance at both ends of the thrust disc small and the fluidity good.

[0074] In some embodiments,

[0075] There is a third gap 06' between the second coil 5' and the second radially outer part 21. The vent holes 05' of the second pressing plate are opposite to the third gap 06' in the axial direction, and the dimension of the third gap 06' in the radial direction is greater than or equal to the radial dimension of the vent holes 05' of the second pressing plate.

[0076] The present utility model also preferably sets the aperture size of the vent holes of the second pressing plate ≤ the radial distance between the coil and the stator core, which can further effectively avoid the pole positions by the vent holes of the second pressing plate, further avoid affecting the magnetic circuit, and the vent holes of the thrust disc are communicated with the ventilation paths at both ends without obstruction, and can also make the air flow resistance at both ends of the thrust disc small and the fluidity good.

[0077] In some embodiments,

[0078] The axial stator two 2 further includes an axial outer part two 24, and the axial outer part two 24 is arranged away from the thrust disk 3 relative to the coil two 5' in the axial direction of the magnetic suspension bearing. Inside the coil slot two 23, there is also a fourth gap between the axial outer part two 24 and the coil two 5', forming a bearing stator ventilation slot two 04'.

[0079] A bearing stator ventilation hole two 03' is arranged on the axial outer part two 24 of the axial stator two 2. The bearing stator ventilation hole two 03' penetrates from one axial end face of the axial outer part two 24 to the other axial end face to communicate with the bearing stator ventilation slot two 04', and further communicates with the pressing plate two ventilation hole 05' through the third gap 06', and then communicates with the air flow passage space 02.

[0080] The utility model can further accelerate the gas flow in the coil slot cavity of the axial stator two by arranging bearing stator ventilation holes and ventilation slots (multiple gas flow paths) in the coil slot of the axial stator two, and realize the effective independent heat dissipation of the axial coil and the thrust disk.

[0081] In some embodiments,

[0082] A thrust disk ventilation hole 01 is arranged through the thrust disk 3 from one axial end face to the other axial end face. In the axial direction, the thrust disk ventilation hole 01 is located at a position opposite to the gap between the radial inner periphery of the radial inner part one 12 and the rotor 6, and the thrust disk ventilation hole 01 is not opposite to the magnetic pole position of the axial stator one 1; in the axial direction, the thrust disk ventilation hole 01 is also located at a position opposite to the gap between the radial inner periphery of the radial inner part two 22 and the rotor 6, and the thrust disk ventilation hole 01 is not opposite to the magnetic pole position of the axial stator two 2.

[0083] The utility model realizes its own active air suction heat exchange through the thrust disk ventilation hole opened on the thrust disk, increases the gas flow rate introduced, accelerates the cooling of the axial magnetic bearing, can actively cool the thrust disk itself and increase the cooling flow rate to accelerate the heat dissipation of the axial coil, improves the cooling and heat dissipation effect of the magnetic suspension bearing, and makes the thrust disk ventilation hole not opposite to the magnetic pole positions of the axial stator one and two, so that no hole is punched at the position of the thrust disk end face facing the magnetic pole, and the cooling air cannot directly reach the magnetic pole gap position, which can effectively avoid the influence of the cooling gas and the opening on the magnetic furnace structure, thus avoiding insufficient magnetic suspension axial supporting force, realizing the improvement of the heat dissipation and cooling of the magnetic suspension bearing while avoiding the influence on the magnetic suspension magnetic circuit, ensuring sufficient magnetic suspension supporting force, and effectively reducing the influence of the gas acting force on the axial force.

[0084] In some embodiments,

[0085] The aperture diameter of the thrust disk ventilation hole 01 < the radial distance between the first radial inner part 12 and the rotor 6, and the aperture diameter of the thrust disk ventilation hole 01 < the radial distance between the second radial inner part 22 and the rotor 6.

[0086] The present utility model also preferably arranges the thrust disk ventilation hole at the gap between the axially lower magnetic pole and the rotor. The aperture size ≤ the radial distance between the axially lower stator magnetic pole and the rotor, which can further effectively avoid the magnetic pole position by the thrust disk ventilation hole, further avoid affecting the magnetic circuit, and the thrust disk ventilation hole is connected to the ventilation paths at both ends without obstruction, and can also make the air flow resistance at both ends of the thrust disk small and the fluidity good.

[0087] In some embodiments,

[0088] Along the axial direction of the thrust disk 3, the thrust disk ventilation hole 01 is an inclined hole structure whose extending direction is not parallel to the axis of the thrust disk 3. From the observation direction of the axial end face on the air inlet side of the thrust disk 3 towards the axial end face on the air outlet side, the rotation direction of the thrust disk 3 is the first rotation direction, and the extending direction of the thrust disk ventilation hole 01 from the axial end face on the air inlet side of the thrust disk towards the axial end face on the air outlet side is the second rotation direction, and the second rotation direction is opposite to the first rotation direction.

[0089] The present utility model also arranges the thrust disk ventilation hole so that its extending direction from the axial end face on the air inlet side towards the axial end face on the air outlet side is the second rotation direction, and the second rotation direction is opposite to the first rotation direction (the rotation direction of the thrust disk). When the rotor drives the thrust disk to rotate at a high speed, negative pressure can be generated to suck out the hot air at one end and discharge it to the outside, increase the flow rate of the introduced gas, realize the active ventilation and heat exchange of the thrust disk itself, accelerate the gas flow, save energy consumption, and improve the heat dissipation performance and energy efficiency at the same time.

[0090] In some embodiments,

[0091] There are multiple thrust disk ventilation holes 01, and the multiple thrust disk ventilation holes 01 are arranged at intervals along the circumferential direction of the thrust disk 3, and the extending direction of each thrust disk ventilation hole 01 from the axial end face on the air inlet side towards the axial end face on the air outlet side is the second rotation direction, and is opposite to the first rotation direction of the thrust disk 3.

[0092] The utility model provides a magnetic levitation rotary machine (preferably a blower) with active and efficient heat dissipation. The thrust disk adopts an inclined hole scheme to achieve self-active air intake and heat exchange through high-speed rotation, increasing the gas flow rate introduced, accelerating the cooling of the axial magnetic bearing, and at the same time cooperating with the overall active pure air-cooling heat dissipation of the magnetic levitation rotary machine. It uses the coaxial impeller at the other end of the main impeller or the negative pressure cooling caused by the rotation of the rotor or the leakage cooling of the main impeller for cooling. It changes from the previous external passive heat dissipation to internal active heat dissipation, improving the heat dissipation efficiency and reducing the heat dissipation cost. This cooling scheme for the magnetic levitation rotary machine can effectively ventilate and dissipate heat for the motor stator, motor rotor, magnetic bearing, etc., and can also better dissipate heat for the axial magnetic bearing, improving the stability of the magnetic levitation system.

[0093] Preferably, the axial magnetic bearing of the utility model adopts active ventilation cooling. The thrust disk is installed on the rotor, with inclined holes between the two magnetic poles of the thrust disk, and several inclined holes are arranged in the circumferential direction of the thrust disk. The air intake direction is opposite to the rotation direction of the rotor. When the rotor drives the thrust disk to rotate at high speed, negative pressure is generated to suck out the hot air at one end and discharge it to the outside, increasing the gas flow rate introduced, realizing the self-active ventilation and heat exchange of the thrust disk, accelerating the gas flow, and at the same time cooperating with the ventilation holes and ventilation grooves in the axial stator coil slot to accelerate the gas flow in the cavity of the axial stator coil slot, realizing the effective independent heat dissipation of the axial coil and the thrust disk.

[0094] According to the principle of the axial magnetic levitation bearing, the relative position between the thrust disk and the axial magnetic pole is the force output position, that is, no holes can be drilled at the position where the end face of the thrust disk faces the magnetic pole to avoid insufficient axial force. At the same time, the cooling air cannot directly reach the magnetic pole gap position, which can reduce the influence of gas force on the axial force. According to the requirements of the axial magnetic circuit circulation, to ensure that magnetic saturation does not occur at other positions prior to the magnetic pole position, in the radial circumferential direction, the cross-sectional area of the position where the magnetic circuit flows through ≥ the cross-sectional area of the magnetic pole position. If the opening position of the inclined hole of the thrust disk is outside the magnetic circuit to avoid affecting the magnetic circuit, it is preferably located at the non-magnetic part of the inner ring of the lower axial magnetic pole, the aperture size < the radial distance between the lower axial stator magnetic pole and the rotor, and there are corresponding ventilation channels on both sides of the hole, with no obstruction at both ends and small air flow resistance at both ends, and good fluidity.

[0095] Preferably, the entire system of the utility model adopts an active pure air-cooling heat dissipation system. The cold air is driven by the coaxial impeller at the other end of the main impeller or the centrifugal air intake caused by the rotation of the rotor or the leakage air intake of the main impeller, without an additional heat dissipation drive motor. The flow rate of the cooling cold air is adjusted by the motor speed, without an additional controller. The overall internal flow channel layout guides the cold air to each component for targeted heat dissipation. The entire heat dissipation system has a simple structure and an efficient and reliable heat dissipation process.

[0096] The beneficial effects of the utility model are as follows:

[0097] 1. The utility model provides a ventilation flow channel in the axial bearing coil groove of a high-heat-generating component and a non-magnetic part of a thrust disk with inclined holes. Heat is sucked out through the inclined hole flow channel by negative pressure, which can actively cool the thrust disk itself and increase the cooling flow rate to accelerate the heat dissipation of the axial coil. The active pure air-cooling heat dissipation system reduces the heat dissipation cost. Targeted ventilation of heat-generating components can effectively accelerate cooling and improve reliability.

[0098] 2. The utility model also cooperates with the overall machine flow channel structure layout, and conducts targeted ventilation and heat dissipation on the heat-generating components, realizing effective ventilation and cooling of the overall heat-generating components of the magnetic levitation rotating machine, and improving the stability of the magnetic levitation system; realizing an integrated high-efficiency pure air-cooling heat dissipation system, which can ensure that the magnetic levitation rotating machine has sufficient heat dissipation air volume under various working conditions. The cold air is directly driven by the motor rotor, the control logic is simple, and the reliability of the heat dissipation system is high.

[0099] The utility model also provides a magnetic levitation rotating machine (preferably a rotating machine such as a motor, a blower, a ventilator or a compressor), which includes the aforementioned magnetic levitation bearing.

[0100] Figure 1 、 Figure 3 The internal axial bearing cooling path of the magnetic levitation machine (preferably a blower) of the utility model is shown as follows. Inclined holes (thrust disk ventilation holes 01) are opened on the thrust disk 3, and bearing stator ventilation holes are provided on both the axial stator one / two. Bearing stator ventilation grooves are opened in the coil grooves, preferably in a radial, annular or spiral shape, etc. This cooling path is divided into two heat dissipation paths. The first path: during operation, the intake direction of the inclined holes on the thrust disk is opposite to the rotation direction of the rotor. The thrust disk uses negative pressure to suck out the heat dissipation gas from the left end. When working, the heat at the left end passes through the inclined hole flow channel of the thrust disk and is sucked into the lower cavity of the axial stator two from the lower cavity of the axial stator one, increasing the gas flow rate and accelerating heat exchange. The second path: the cooling gas passes through the bearing stator ventilation hole 03 on the axial stator, through the bearing stator ventilation groove 04, the outer circle of the axial coil (the first gap 06), the ventilation hole 05 of the first pressing plate, the outer circle of the thrust disk (the air flow circulation space 02), the ventilation hole 05' of the second pressing plate, the outer circle of the axial coil (the third gap 06'), the bearing stator ventilation groove 04' and finally is discharged from the axial stator ventilation hole 03', effectively exchanging heat with the axial stator; the two paths ventilate simultaneously to accelerate the gas discharge and heat dissipation, and cooperate with the overall scheme cooling path to achieve an effective heat dissipation effect. To make the thrust disk intake by negative pressure, the intake direction needs to be always opposite to the rotation direction of the rotor. Therefore, the rotation direction of the inclined holes on the thrust disk is related to the intake direction of the thrust disk and the rotation direction of the rotor. If the rotor rotates clockwise when viewed from the right end when the left end of the thrust disk intakes air, the thrust disk has right-handed inclined holes. If the rotor rotates counterclockwise when viewed from the right end when the left end of the thrust disk intakes air, it is left-handed inclined holes. Vice versa. If the directions do not match, the heat dissipation effect will be weakened and the heat dissipation efficiency will be reduced.

[0101] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model. The above is only the preferred implementation manner of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present utility model, several improvements and variations can still be made, and these improvements and variations should also be regarded as within the protection scope of the present utility model.

Claims

1. A magnetic bearing, characterized in that: include: An axial stator (1), an axial stator (2) and a thrust plate (3), wherein in the axial direction of the magnetic bearing, the thrust plate (3) is arranged between the axial stator (1) and the axial stator (2), the axial stator (1) comprises a radial outer portion (11) and a radial inner portion (12), the radial outer portion (11) and the radial inner portion (12) are arranged at intervals in the radial direction of the axial stator (1), and a coil slot (13) is formed between the two, and a coil (5) is arranged in the coil slot (13); It also includes a pressure plate (4), which is located between the axial stator (1) and the thrust plate (3), and an axial end face of the pressure plate (4) is connected to the radial outer side (11) of the axial stator (1), and the other axial end face of the pressure plate (4) is opposite to the thrust plate (3); a pressure plate ventilation hole (05) is provided on the pressure plate (4) from its axial end face to the other axial end face, and the pressure plate ventilation hole (05) is opposite to the position of the coil slot (13) in the axial direction, and the pressure plate ventilation hole (05) is not opposite to the magnetic pole position of the axial stator (1).

2. The magnetic bearing according to claim 1, characterized in that: The magnetic pole position of the axial stator (1) includes a portion of the pressure plate (4) opposite to the thrust disk (3) and a portion of the radial inner portion (12) opposite to the thrust disk (3); the radial outer peripheral wall of the thrust disk (3) is located at a position opposite to the radial inner peripheral wall of the pressure plate (4) and the radial outer peripheral wall of the pressure plate (4); the pressure plate ventilation hole (05) is located on the periphery of the portion of the pressure plate (4) opposite to the thrust disk (3); the outer periphery of the thrust disk (3) is formed as an air flow space (02); and the air flow space (02) is connected to the pressure plate ventilation hole (05).

3. The magnetic bearing according to claim 2, characterized in that: A first gap (06) is provided between the coil one (5) and the radial outer portion one (11); the pressure plate one ventilation hole (05) is opposite to the first gap (06) in the axial direction, and the radial dimension of the first gap (06) is greater than or equal to the radial dimension of the pressure plate one ventilation hole (05).

4. The magnetic bearing according to claim 3, characterized in that: The axial stator (1) further comprises an axial outer portion (14), which is arranged in the axial direction of the magnetic bearing relative to the coil (5) and away from the thrust plate (3), and inside the coil slot (13), there is also a second gap between the axial outer portion (14) and the coil (5), forming a bearing stator ventilation slot (04); A bearing stator ventilation hole (03) is provided on the axial outer side portion (14) of the axial stator (1). The bearing stator ventilation hole (03) extends from one axial end surface of the axial outer side portion (14) to the other axial end surface to communicate with the bearing stator ventilation groove (04), and further communicates with the pressure plate ventilation hole (05) through the first gap (06), and further connects to the air flow space (02).

5. The magnetic bearing according to claim 1, characterized in that: The second axial stator (2) comprises a second radial outer portion (21) and a second radial inner portion (22), wherein the second radial outer portion (21) and the second radial inner portion (22) are spaced apart in the radial direction of the second axial stator (2), and a second coil slot (23) is formed therebetween, and a second coil (5') is arranged in the second coil slot (23); It also includes a pressure plate 2 (4'), which is located between the axial stator 2 (2) and the thrust plate (3), and one axial end face of the pressure plate 2 (4') is connected to the radial outer side 2 (21) of the axial stator 2 (2), and the other axial end face of the pressure plate 2 (4') is opposite to the thrust plate (3); a pressure plate 2 ventilation hole (05') is provided on the pressure plate 2 (4') from its one axial end face to the other axial end face, and the pressure plate 2 ventilation hole (05') is opposite to the position of the coil slot 2 (23) in the axial direction, and the pressure plate 2 ventilation hole (05') is not opposite to the magnetic pole position of the axial stator 2 (2).

6. The magnetic bearing according to claim 5, characterized in that: The magnetic pole position of the second axial stator (2) includes the portion of the second pressure plate (4') opposite to the thrust plate (3), and the portion of the second radial inner portion (22) opposite to the thrust plate (3), The radial outer peripheral wall of the thrust plate (3) is located at a position opposite to the radial inner peripheral wall of the pressure plate 2 (4') and the radial outer peripheral wall of the pressure plate 2 (4'); the pressure plate 2 ventilation hole (05') is located at the outer periphery of the portion of the pressure plate 2 (4') opposite to the thrust plate (3); the outer periphery of the thrust plate (3) is formed as an air flow circulation space (02); and the air flow circulation space (02) is connected to the pressure plate 2 ventilation hole (05').

7. The magnetic bearing according to claim 6, characterized in that: A third gap (06') is provided between the coil 2 (5') and the radial outer portion 2 (21); the ventilation hole (05') of the pressure plate 2 is opposite to the third gap (06') in the axial direction, and the radial dimension of the third gap (06') is greater than or equal to the radial dimension of the ventilation hole (05') of the pressure plate 2.

8. The magnetic bearing according to claim 7, characterized in that: The axial stator 2 (2) further comprises an axial outer portion 2 (24), the axial outer portion 2 (24) being arranged in the axial direction of the magnetic bearing relative to the coil 2 (5') and away from the thrust plate (3), and inside the coil slot 2 (23), there is also a fourth gap between the axial outer portion 2 (24) and the coil 2 (5'), forming a bearing stator ventilation slot 2 (04'); A bearing stator ventilation hole 2 (03') is provided on the axial outer side 2 (24) of the axial stator 2 (2). The bearing stator ventilation hole 2 (03') extends from one axial end surface of the axial outer side 2 (24) to the other axial end surface to communicate with the bearing stator ventilation groove 2 (04'), and further communicates with the pressure plate ventilation hole 2 (05') through the third gap (06'), and further connects to the air flow space (02).

9. The magnetic bearing according to claim 5, characterized in that: The thrust disk (3) is provided with a thrust disk ventilation hole (01) extending from one axial end face to the other axial end face thereof. In the axial direction, the thrust disk ventilation hole (01) is located at a position opposite to the gap between the radial inner periphery of the radial inner side portion 1 (12) and the rotor (6), and the thrust disk ventilation hole (01) is not opposite to the magnetic pole position of the axial stator 1 (1); in the axial direction, the thrust disk ventilation hole (01) is also located at a position opposite to the gap between the radial inner periphery of the radial inner side portion 2 (22) and the rotor (6), and the thrust disk ventilation hole (01) is not opposite to the magnetic pole position of the axial stator 2 (2).

10. The magnetic bearing according to claim 9, characterized in that: The diameter of the thrust plate ventilation hole (01) is smaller than the radial distance between the radial inner part 1 (12) and the rotor (6), and the diameter of the thrust plate ventilation hole (01) is smaller than the radial distance between the radial inner part 2 (22) and the rotor (6).

11. The magnetic bearing according to claim 9, characterized in that: Along the axial direction of the thrust plate (3), the thrust plate ventilation hole (01) is an inclined hole structure whose extension direction is not parallel to the axis of the thrust plate (3); when observing from the axial end face of the air inlet side of the thrust plate (3) toward the axial end face of the air outlet side, the rotation direction of the thrust plate (3) is toward a first rotation direction; the thrust plate ventilation hole (01) extends from the axial end face of the air inlet side of the thrust plate (3) toward the axial end face of the air outlet side toward a second rotation direction, and the second rotation direction is opposite to the first rotation direction.

12. The magnetic bearing according to claim 11, characterized in that: There are a plurality of thrust plate ventilation holes (01), which are arranged at intervals along the circumferential direction of the thrust plate (3), and an extension direction of each thrust plate ventilation hole (01) from an axial end face on an air inlet side of the thrust plate toward an axial end face on an air outlet side is oriented toward a second rotation direction, which is opposite to the first rotation direction of the thrust plate (3).

13. A magnetically suspended rotating machine, characterized in that: The invention comprises the magnetic bearing according to any one of claims 1 to 12.

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