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 arranged between axial stator no. A first thrust disc ventilation hole is formed in the thrust disc in a penetrating mode from one axial end face to the other axial end face of the thrust disc, the first axial stator comprises a first radial outer side portion and a first radial inner side portion, and one end, located on the other axial end face of the thrust disc, of the first thrust disc ventilation hole is located between the second radial inner side portion of the second axial stator and the rotor. One end, located on one axial end face of the thrust disc, of the first thrust disc ventilation hole is opposite to the position of the first coil groove in the axial direction, and the first thrust disc ventilation hole 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, and particularly relates to a magnetic levitation bearing and a magnetic levitation rotating machine. Background Art

[0002] At present, the heat dissipation of magnetic levitation blowers mainly relies on external cooling equipment, usually including external cooling fans, water cooling systems, heat exchangers, etc. This results in high equipment maintenance costs, complex structural systems, and increased potential safety hazards. Or in the form of negative pressure, air is sucked from inside the blower 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 enables the axial movement of the rotating shaft. It is necessary to have an axially stressed component on the rotating shaft, which is the thrust disc. The axial magnetic bearing and the thrust disc are made of a solid pure iron structure, with relatively large self-loss, general thermal conductivity, and a 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 disc 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 bearing inside the rotating machine 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 bearing inside the rotating machine 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 disc. In the axial direction of the magnetic levitation bearing, the thrust disc is arranged between the axial stator one and the axial stator two. A first thrust disc ventilation hole is penetrated from one axial end face to the other axial end face of the thrust disc. 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 between them. A coil one is arranged in the coil slot one;

[0008] The axial stator two includes a radial outer part two and a radial inner part two,

[0009] One end of the first thrust disc ventilation hole, which is located on the other axial end face of the thrust disc, is located between the second radial inner part of the axial stator two and the rotor. One end of the first thrust disc ventilation hole, which is located on the one axial end face of the thrust disc, is opposite to the position of the first coil slot in the axial direction, and the first thrust disc ventilation hole is not opposite to the magnetic pole position of the axial stator one.

[0010] In some embodiments,

[0011] It further includes a first pressing plate, which is located between the axial stator one and the thrust disc. One axial end face of the first pressing plate is connected to the first radial outer part of the axial stator one, and the other axial end face of the first pressing plate faces the thrust disc;

[0012] The magnetic pole position of the axial stator one includes the part where the first pressing plate faces the thrust disc and the part where the first radial inner part faces the thrust disc. There is a first gap between the first pressing plate and the first radial inner part. The first thrust disc ventilation hole is opposite to the first gap in the axial direction, and the dimension of the first gap in the radial direction is greater than or equal to the radial dimension of the end of the first thrust disc ventilation hole opposite to the first coil slot.

[0013] In some embodiments,

[0014] In any radial section of the thrust disc, the cross-sectional area of the position where the magnetic circuit of the axial stator one flows through = the radial cross-sectional area of the part where the thrust disc faces the axial stator one - the cross-sectional area of the first thrust disc ventilation hole ≥ the cross-sectional area of the magnetic pole position of the axial stator one.

[0015] In some embodiments,

[0016] Inside the first coil slot, there is a second gap between the radial inner side of the first coil and the first radial inner part, forming a first gas flow path.

[0017] The axial stator one 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 third gap between the first axial outer part and the first coil, forming a bearing stator ventilation slot one;

[0018] A first bearing stator ventilation hole is provided on the first axial outer part of the axial stator one. The first bearing stator ventilation hole penetrates from one axial end face of the first axial outer part to the other axial end face to communicate with the bearing stator ventilation slot one, and further communicates with the first thrust disc ventilation hole through the first gas flow path.

[0019] In some embodiments,

[0020] Along the axial direction of the thrust disc, the first thrust disc ventilation hole is an inclined hole structure whose extending direction is not parallel to the axis of the thrust disc. From the observation direction of the axial end face on the air inlet side of the thrust disc towards the axial end face on the air outlet side, the rotation direction of the thrust disc is the first rotation direction, and the extending direction of the first thrust disc ventilation hole from the axial end face on the air inlet side of the thrust disc towards the axial end face on the air outlet side is towards the second rotation direction, and the second rotation direction is opposite to the first rotation direction.

[0021] In some embodiments,

[0022] There are multiple first thrust disc ventilation holes, and the multiple first thrust disc ventilation holes are arranged at intervals along the circumferential direction of the thrust disc, and the extending direction of each first thrust disc ventilation hole from the axial end face on the air inlet side of the thrust disc towards the axial end face on the air outlet side is towards the second rotation direction, and is opposite to the first rotation direction of the thrust disc.

[0023] In some embodiments,

[0024] A second thrust disc ventilation hole is provided through the thrust disc from its axial other end face to the axial one end face, and the second thrust disc ventilation hole is misaligned and not communicated with the first thrust disc ventilation hole;

[0025] The second radial outer part and the second radial inner part are arranged at intervals in the radial direction of the axial stator two, and a coil slot two is formed therebetween. A coil two is arranged in the coil slot two. One end of the second thrust disc ventilation hole located on the axial one end face of the thrust disc is located between the first radial inner part of the axial stator one and the rotor. One end of the second thrust disc ventilation hole located on the axial other end face of the thrust disc is axially opposite to the position of the coil slot two, and the second thrust disc ventilation hole is not opposite to the magnetic pole position of the axial stator two.

[0026] In some embodiments,

[0027] 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 connected to 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;

[0028] The magnetic pole positions of the axial stator two include the part of the second pressing plate opposite to the thrust disc and the part of the second radially inner part opposite to the thrust disc. There is a fourth gap between the second pressing plate and the second radially inner part. The second thrust disc ventilation hole is axially opposite to the fourth gap, and the dimension of the fourth gap in the radial direction is greater than or equal to the radial dimension of the end of the second thrust disc ventilation hole opposite to the coil slot two.

[0029] In some embodiments,

[0030] In each radial section of the thrust disc, the cross-sectional area of the magnetic circuit flowing position of the axial stator two = the radial cross-sectional area of the part of the thrust disc opposite to the axial stator two - the cross-sectional area of the second thrust disc ventilation hole ≥ the cross-sectional area of the magnetic pole position of the axial stator two.

[0031] In some embodiments,

[0032] Inside the coil slot two, there is a fifth gap between the radially inner side of the coil two and the second radially inner part, forming a second gas flow path.

[0033] The axial stator two further includes an axially outer part two, which is arranged away from the thrust disc relative to the coil two in the axial direction of the magnetic levitation bearing. Inside the coil slot two, there is also a sixth gap between the axially outer part two and the coil two, forming a bearing stator ventilation slot two.

[0034] On the axially outer part two of the axial stator two, there is a bearing stator ventilation hole two, which penetrates from one axial end face of the axially outer part two to the other axial end face to communicate with the bearing stator ventilation slot two, and further communicates with the second thrust disc ventilation hole through the second gas flow path.

[0035] In some embodiments,

[0036] Along the axial direction of the thrust disc, the second thrust disc ventilation hole is an inclined hole structure whose extension direction is not parallel to the axis of the thrust disc. From the observation direction of the axial end face of the intake side of the thrust disc towards the axial end face of the exhaust side, the rotation direction of the thrust disc is towards the third rotation direction, and the extension direction of the second thrust disc ventilation hole from the axial end face of the intake side of the thrust disc towards the axial end face of the exhaust side is towards the fourth rotation direction, and the fourth rotation direction is opposite to the third rotation direction.

[0037] In some embodiments,

[0038] The second thrust disk ventilation holes are multiple, and the multiple second thrust disk ventilation holes are arranged at intervals along the circumferential direction of the thrust disk. Moreover, the extending direction of each second thrust disk ventilation hole 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 towards the fourth rotation direction, and is opposite to the third rotation direction of the thrust disk.

[0039] The present utility model further provides a magnetic levitation rotating machine, which includes the aforementioned magnetic levitation bearing.

[0040] The magnetic levitation bearing and the magnetic levitation rotating machine provided by the present utility model have the following beneficial effects:

[0041] 1. By providing the first and / or second thrust disk ventilation holes on the thrust disk, the present utility model realizes self-active air intake and heat exchange through high rotational speed, 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 on the magnetic levitation bearing. Moreover, making the end of the first thrust disk ventilation hole opposite to the coil slot 1 not opposite to the magnetic pole position of the axial stator 1 (the end of the second thrust disk ventilation hole not opposite to the magnetic pole position of the axial stator 2) can prevent the thrust disk end face from being drilled at the position directly opposite to the magnetic pole, 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 support force, realizing 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 the gas force on the axial force; the present utility model further preferably arranges the first thrust disk ventilation hole to extend from one end of the thrust disk located between the axial stator and the rotor to the other end of the thrust disk opposite to the coil slot 1, which can cool and dissipate the heat of the coil inside the stator, and the aperture size of the end opposite to the coil slot 1 ≤ the radial distance between the upper and lower magnetic poles of the axial stator, which can further effectively avoid the magnetic pole position by the thrust disk ventilation hole, further avoiding 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.

[0042] 2. The present utility model further sets the relationship in any radial cross-section of the thrust disc: the cross-sectional area of the magnetic path flowing through the axial stator 1 = the radial cross-sectional area of the relative part of the thrust disc and the axial stator 1 - the cross-sectional area of the first thrust disc ventilation hole ≥ the cross-sectional area of the magnetic pole position of the axial stator 1, so that other magnetic path parts on the thrust disc different from the magnetic pole position will not show magnetic field saturation prior to the magnetic pole position, ensuring the formation of a normal magnetic flux loop and the continuous and effective provision of magnetic levitation supporting force; the present utility model also sets the thrust disc ventilation hole 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 disc). When the rotor drives the thrust disc to rotate at high speed, negative pressure can be generated to suck out hot air at one end and discharge it to the outside, increasing the inflow gas flow rate, realizing the active ventilation and heat exchange of the thrust disc 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 circulation 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 disc. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 is a longitudinal sectional view of Embodiment 1 of the magnetic levitation bearing of the present utility model;

[0044] Figure 2 is Figure 1 the plan view of the thrust disc structure in

[0045] Figure 3 is a longitudinal sectional view of Embodiment 2 of the magnetic levitation bearing of the present utility model;

[0046] Figure 4 is Figure 3 the plan view of the thrust disc structure in

[0047] Figure 5 is the three-dimensional structure diagram of the axial stator 1 of the present utility model.

[0048] The reference numerals are shown as:

[0049] 1. Axial stator 1; 11. Radial outer part 1; 12. Radial inner part 1; 13. Coil slot 1; 14. Axial outer part 1; 2. Axial stator 2; 21. Radial outer part 2; 22. Radial inner part 2; 23. Coil slot 2; 24. Axial outer part 2; 3. Thrust disc; 4. Press plate 1; 4'. Press plate 2; 5. Coil 1; 5'. Coil 2; 6. Rotor;

[0050] 01. First thrust disk ventilation hole; 02. Second thrust disk ventilation hole; 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. First gap; 06. First gas flow path; 07. Fourth gap; 08. Second gas flow path. Detailed implementation manners

[0051] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part rather than all of the embodiments of the present utility model. The following description of at least one exemplary embodiment is actually illustrative only and in no way limits the present utility model and its application or use. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0052] It should be noted that the terms used herein are only for describing specific implementation manners 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 forms are also intended to include the plural forms. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they specify the presence of the described features, steps, operations, devices, components, and / or combinations thereof.

[0053] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and 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 convenience 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.

[0054] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by orientation terms such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom", etc. is usually based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description. Without contrary description, these orientation terms do not indicate and imply that the device or component referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the protection scope of the present utility model; the orientation terms "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0055] For the convenience of description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "upper...", etc. can be used here to describe the spatial positional relationship between a device or feature shown in the figure and other devices or features. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation described in the figure for the device. For example, if the device in the drawing is inverted, the device described as "above other devices or structures" or "over other devices or structures" will then be positioned "below other devices or structures" 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 corresponding interpretations are made for the spatial relative descriptions used here.

[0056] In addition, it should be noted that using words such as "first", "second", etc. to limit components is only for the convenience of differentiating the corresponding components. Without additional statement, the above words have no special meaning. Therefore, it cannot be understood as a limitation on the protection scope of the present utility model.

[0057] As Figures 1-5 shown, the present utility model provides a magnetic levitation bearing, which includes:

[0058] 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 first thrust disk ventilation hole 01 runs 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. The axial stator two 2 includes a radially outer part two 21 and a radially inner part two 22.

[0059] One end of the first thrust disk ventilation hole 01 located on the other axial end face of the thrust disk 3 is located between the inner radial part two 22 of the axial stator two 2 and the rotor 6. One end of the first thrust disk ventilation hole 01 located on the axial one end face of the thrust disk 3 is opposite to the position of the coil slot one 13 in the axial direction, and the first thrust disk ventilation hole 01 is not opposite to the magnetic pole position of the axial stator one 1.

[0060] Through the first thrust disk ventilation hole opened on the thrust disk, the present utility model realizes self - active air suction and heat exchange through high - speed rotation, 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 levitation bearing, and makes the end of the first thrust disk ventilation hole opposite to the coil slot one not opposite to the magnetic pole position of the axial stator one, so that no hole is punched at the position of the thrust disk end face facing the magnetic pole, preventing the cooling air from directly reaching the magnetic pole gap position, effectively avoiding the influence of the cooling gas and the opening on the magnetic furnace structure, thus avoiding insufficient magnetic levitation axial supporting force, realizing the improvement of heat dissipation and cooling of the magnetic levitation bearing while avoiding the influence on the magnetic levitation magnetic circuit, ensuring sufficient magnetic levitation supporting force, and effectively reducing the influence of gas force on the axial force.

[0061] In some embodiments,

[0062] It further includes a first pressing plate 4. The first pressing plate 4 is located between the axial stator one 1 and the thrust disk 3. One axial end face of the first pressing plate 4 is connected to the outer radial part one 11 of the axial stator one 1, and the other axial end face of the first pressing plate 4 faces the thrust disk 3.

[0063] The magnetic pole position of the axial stator one 1 includes the part where the first pressing plate 4 faces the thrust disk 3 and the part where the inner radial part one 12 faces the thrust disk 3. There is a first gap 05 between the first pressing plate 4 and the inner radial part one 12. The first thrust disk ventilation hole 01 is opposite to the first gap 05 in the axial direction, and the radial dimension of the first gap 05 is greater than or equal to the radial dimension of the end of the first thrust disk ventilation hole 01 opposite to the coil slot one 13.

[0064] The ventilation holes of the first thrust disc of the present utility model extend from one end of the thrust disc at the position between the axial stator and the rotor to the other end of the thrust disc opposite to the coil slot 1. It can cool and dissipate heat from the coils inside the stator. And the end of the first thrust disc ventilation hole opposite to the coil slot 1 is preferably also arranged at the position directly opposite to the coil between the upper and lower axial magnetic poles. The aperture size ≤ the radial distance between the upper and lower magnetic poles of the axial stator, which can enable the first thrust disc ventilation hole to further effectively avoid the magnetic pole position, further avoid affecting the magnetic circuit, and the first thrust disc 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 disc small and the fluidity good.

[0065] In some embodiments,

[0066] In any radial cross-section of the thrust disc 3, the cross-sectional area of the position where the magnetic circuit of the axial stator 1 flows through = the radial cross-sectional area of the part of the thrust disc opposite to the axial stator 1 - the cross-sectional area of the first thrust disc ventilation hole 01 ≥ the cross-sectional area of the magnetic pole position of the axial stator 1.

[0067] The present utility model further sets, in any radial cross-section of the thrust disc, the relationship: the cross-sectional area of the position where the magnetic circuit of the axial stator 1 flows through = the radial cross-sectional area of the part of the thrust disc opposite to the axial stator 1 - the cross-sectional area of the first thrust disc ventilation hole ≥ the cross-sectional area of the magnetic pole position of the axial stator 1, so that other magnetic circuit parts on the thrust disc different from the magnetic pole position will not have magnetic field saturation prior to the magnetic pole position, ensuring the formation of a normal magnetic flux loop and ensuring the continuous and effective provision of the magnetic levitation supporting force.

[0068] In some embodiments,

[0069] Inside the coil slot 13, there is a second gap between the radial inner side of the coil 5 and the first radial inner part 12, forming a first gas flow path 06.

[0070] The axial stator 1 further includes an axial outer part 14. The axial outer part 14 is arranged away from the thrust disc 3 relative to the coil 5 in the axial direction of the magnetic levitation bearing. Inside the coil slot 13, there is also a third gap between the axial outer part 14 and the coil 5, forming a bearing stator ventilation slot 04.

[0071] A bearing stator ventilation hole 03 is provided on the axial outer part 14 of the axial stator 1. The bearing stator ventilation hole 03 penetrates from one axial end face of the axial outer part 14 to the other axial end face to communicate with the bearing stator ventilation slot 04, and further communicates with the first thrust disc ventilation hole 01 through the first gas flow path 06.

[0072] The present utility model further enables further acceleration of the gas flow in the cavity of the axial stator coil slots through the bearing stator ventilation holes and ventilation grooves (multiple gas flow paths) provided in the axial stator coil slots, thereby achieving effective self-cooling of the axial coils and the thrust disc.

[0073] In some embodiments,

[0074] Along the axial direction of the thrust disc 3, the first thrust disc ventilation hole 01 is an inclined hole structure whose extending direction is not parallel to the axis of the thrust disc 3. From the observation direction of the axial end face on the air inlet side of the thrust disc 3 towards the axial end face on the air outlet side, the rotation direction of the thrust disc 3 is the first rotation direction, and the extending direction of the first thrust disc ventilation hole 01 from the axial end face on the air inlet side of the thrust disc towards the axial end face on the air outlet side is towards the second rotation direction, and the second rotation direction is opposite to the first rotation direction.

[0075] The present utility model also sets the first thrust disc 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 towards the second rotation direction, and the second rotation direction is opposite to the first rotation direction (the rotation direction of the thrust disc). When the rotor drives the thrust disc 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 disc itself, accelerating the gas flow, saving energy consumption, and improving the heat dissipation performance while also improving the energy efficiency.

[0076] In some embodiments,

[0077] There are multiple first thrust disc ventilation holes 01, and the multiple first thrust disc ventilation holes 01 are arranged at intervals along the circumferential direction of the thrust disc 3, and the extending direction of each first thrust disc ventilation hole 01 from the axial end face on the air inlet side towards the axial end face on the air outlet side is towards the second rotation direction, all being opposite to the first rotation direction of the thrust disc 3.

[0078] The present utility model provides a magnetically levitated rotating machine (preferably a blower) with active and efficient heat dissipation. The first thrust disc ventilation holes adopt an inclined hole solution to achieve self-active air suction and heat exchange through high rotational speed, increase the gas flow rate, accelerate the cooling of the axial magnetic bearing, and at the same time cooperate with the overall active pure air cooling of the blower. The coaxial impeller at the other end of the main impeller or the negative pressure cooling during rotor rotation or the leakage cooling of the main impeller is used for cooling. It changes from the previous external passive heat dissipation to internal active heat dissipation, improving the heat dissipation efficiency while reducing the heat dissipation cost. This blower cooling solution 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.

[0079] In some embodiments,

[0080] A second thrust disk ventilation hole 02 is provided through the thrust disk 3 from its other axial end face to its one axial end face, and the second thrust disk ventilation hole 02 is offset from and not communicated with the first thrust disk ventilation hole 01;

[0081] The outer radial part two 21 and the inner radial part two 22 are spaced apart in the radial direction of the axial stator two 2, and a coil slot two 23 is formed therebetween. A coil two 5' is arranged in the coil slot two 23. One end of the second thrust disk ventilation hole 02 located on the one axial end face of the thrust disk 3 is located between the inner radial part one 12 of the axial stator one 1 and the rotor 6. One end of the second thrust disk ventilation hole 02 located on the other axial end face of the thrust disk 3 is axially opposite to the position of the coil slot two 23, and the second thrust disk ventilation hole 02 is not opposite to the magnetic pole position of the axial stator two 2.

[0082] In the present utility model, by further making the end of the second thrust disk ventilation hole opposite to the coil slot two not opposite to the magnetic pole position of the axial stator two, it can be ensured that no hole is punched at the position of the thrust disk end face facing the magnetic pole position of the axial stator two, so that the cooling air cannot directly reach the magnetic pole gap position of the axial stator two, which can further effectively avoid the influence of the cooling gas and the opening on the magnetic furnace structure, further avoid insufficient magnetic levitation axial supporting force, further achieve improving the heat dissipation and cooling of the magnetic levitation bearing while avoiding affecting the magnetic levitation magnetic circuit, further improve the magnetic levitation supporting force, and effectively reduce the influence of the gas acting force on the axial force.

[0083] In some embodiments,

[0084] It further includes a second pressing plate 4'. The second pressing plate 4' is located between the axial stator two 2 and the thrust disk 3. One axial end face of the second pressing plate 4' is connected to the outer radial part two 21 of the axial stator two 2, and the other axial end face of the second pressing plate 4' faces the thrust disk 3;

[0085] The magnetic pole position of the axial stator two 2 includes the part where the second pressing plate 4' faces the thrust disk 3 and the part where the inner radial part two 22 faces the thrust disk 3. A fourth gap 07 is provided between the second pressing plate 4' and the inner radial part two 22. The second thrust disk ventilation hole 02 is axially opposite to the fourth gap 07, and the radial dimension of the fourth gap 07 is greater than or equal to the radial dimension of one end of the second thrust disk ventilation hole 02 and the coil slot two 23.

[0086] The ventilation holes of the second thrust disc of the present utility model extend from one end of the thrust disc at the position between the axial stator and the rotor to the other end of the thrust disc opposite to the coil slot 1, which can cool and dissipate the heat of the coils inside the stator. And the end of the second thrust disc ventilation hole opposite to the coil slot 2 is preferably also arranged at the position directly opposite to the coil between the upper and lower magnetic poles in the axial direction. The aperture size ≤ the radial distance between the upper and lower magnetic poles of the axial stator, which can enable the second thrust disc ventilation hole to further effectively avoid the magnetic pole position, further avoid affecting the magnetic circuit, and the second thrust disc 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 disc small and the fluidity good.

[0087] In some embodiments,

[0088] In each radial section of the thrust disc 3, the cross-sectional area of the position where the magnetic circuit of the axial stator 2 flows through = the radial cross-sectional area of the part of the thrust disc opposite to the axial stator 2 - the cross-sectional area of the second thrust disc ventilation hole 02 ≥ the cross-sectional area of the magnetic pole position of the axial stator 2.

[0089] The present utility model further arranges the end of the second thrust disc ventilation hole opposite to the coil slot 2 at the position directly opposite to the coil between the upper and lower magnetic poles of the axial stator 2. Further, the aperture size of this end of the second thrust disc ventilation hole ≤ the radial distance between the upper and lower magnetic poles of the axial stator 2, which can enable the second thrust disc ventilation hole to further effectively avoid the magnetic pole position of the axial stator 2, further avoid affecting the magnetic circuit, and the second thrust disc 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 disc small and the fluidity good.

[0090] In some embodiments,

[0091] Inside the coil slot 23, there is a fifth gap between the radially inner side of the coil 5' and the radially inner part 22, forming a second gas flow path 08.

[0092] The axial stator 2 further includes an axially outer part 24. The axially outer part 24 is arranged away from the thrust disc 3 relative to the coil 5' in the axial direction of the magnetic suspension bearing. Inside the coil slot 23, there is also a sixth gap between the axially outer part 24 and the coil 5', forming a bearing stator ventilation slot 04'.

[0093] A bearing stator ventilation hole 03' is arranged on the axially outer part 24 of the axial stator 2. The bearing stator ventilation hole 03' penetrates from one axial end face of the axially outer part 24 to the other axial end face to communicate with the bearing stator ventilation slot 04', and further communicates with the second thrust disc ventilation hole 02 through the second gas flow path 08.

[0094] The present utility model further enables further acceleration of the gas flow in the coil slots cavity of the axial stator two through the bearing stator ventilation holes and ventilation grooves (multiple gas flow paths) provided in the coil slots of the axial stator two, thereby achieving effective self-cooling of the axial coils and the thrust disc.

[0095] In some embodiments,

[0096] Along the axial direction of the thrust disc 3, the second thrust disc ventilation hole 02 is an inclined hole structure whose extending direction is not parallel to the axis of the thrust disc 3. From the observation direction of the axial end face on the air inlet side of the thrust disc 3 towards the axial end face on the air outlet side, the rotation direction of the thrust disc 3 is the third rotation direction, and the extending direction of the second thrust disc ventilation hole 02 from the axial end face on the air inlet side of the thrust disc 3 towards the axial end face on the air outlet side is the fourth rotation direction, and the fourth rotation direction is opposite to the third rotation direction.

[0097] The present utility model also sets the first thrust disc ventilation hole such 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 third rotation direction (which can be the same as or opposite to the first rotation direction), and the fourth rotation direction is opposite to the third rotation direction (the rotation direction of the thrust disc). When the rotor drives the thrust disc 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, achieving active ventilation and heat exchange of the thrust disc itself, accelerating the gas flow, saving energy consumption, and improving the heat dissipation performance while also improving the energy efficiency.

[0098] In some embodiments,

[0099] There are multiple second thrust disc ventilation holes 02, and the multiple second thrust disc ventilation holes 02 are arranged at intervals along the circumferential direction of the thrust disc 3, and the extending direction of each second thrust disc ventilation hole 02 from the axial end face on the air inlet side of the thrust disc towards the axial end face on the air outlet side is the fourth rotation direction, all of which are opposite to the third rotation direction of the thrust disc 3.

[0100] The present utility model provides a magnetically levitated rotating machine (preferably a blower) with active and efficient heat dissipation. The second thrust disc ventilation hole adopts an inclined hole solution to achieve self-active air suction and heat exchange through high rotational speed, increasing the gas flow rate, accelerating the cooling of the axial magnetic bearing, and at the same time cooperating with the overall active pure air cooling of the blower. Using the coaxial impeller cooling at the other end of the main impeller or the negative pressure cooling during rotor rotation or the leakage cooling of the main impeller, it changes from the previous external passive heat dissipation to internal active heat dissipation, improving the heat dissipation efficiency while reducing the heat dissipation cost. This blower cooling solution 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.

[0101] The axial magnetic bearing of the present 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. Several misaligned X-shaped inclined holes are provided on the thrust disk, which are arranged from the inside to the outside and from the outside to the inside in the axial and radial spaces (for cooling the thrust disk in cooperation with the overall machine scheme, only one intake inclined hole can also be provided for axial cooling). The 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. The thrust disk realizes its own active ventilation heat exchange, accelerating the gas flow. At the same time, it cooperates with the ventilation holes and ventilation grooves in the axial stator coil slots to accelerate the gas flow in the cavity of the axial stator coil slots, realizing the effective independent heat dissipation of the axial coil and the thrust disk.

[0102] According to the principle of the axial magnetic suspension 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 directly 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 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. The opening position of the inclined hole on the thrust disk is within the magnetic circuit. In each radial circumferential direction, the cross-sectional area of the position where the magnetic circuit flows through = the radial circumferential cross-sectional area of the thrust disk - the cross-sectional area in the same direction of the hole position ≥ the cross-sectional area of the magnetic pole position. The upper intake port of the inclined hole is located at the position directly opposite the coil between the upper and lower axial magnetic poles, and the aperture size ≤ the radial distance between the upper and lower axial stator magnetic poles; the lower intake port of the inclined hole is located at the non-magnetic conducting part of the inner ring of the lower axial magnetic pole, and the aperture size < the radial distance between the lower axial stator magnetic pole and the rotor. Both ends of the aperture are connected to the axial stator ventilation path. The air flow resistance at both ends of the thrust disk is small, and the fluidity is good, without affecting the axial force output.

[0103] The entire system uses an active pure air-cooled heat dissipation system. The cold air is driven by a coaxial impeller at the other end of the main impeller, or by the centrifugal intake of the rotor rotation, or by the leakage intake of the main impeller. No additional heat dissipation drive motor is required. The flow rate of the cooling cold air is adjusted by the motor speed, and no additional controller is required. 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 the heat dissipation process is efficient and reliable.

[0104] The beneficial effects of the present utility model are as follows:

[0105] 1. The present utility model sets inclined holes on the thrust disk for high-heat components and cooperates with the ventilation grooves of the axial coil. Using negative pressure, the heat is sucked out through the inclined hole flow channel, 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-cooled heat dissipation system reduces the heat dissipation cost, and the targeted ventilation of the heat-generating components can effectively accelerate the cooling and improve the reliability;

[0106] 2. The present utility model also cooperates with the overall machine flow channel structure, and conducts targeted ventilation and heat dissipation on the heating components, so as to effectively ventilate and cool the overall heating components of the blower, improve the stability of the magnetic levitation system; and realize an integrated high-efficiency pure air-cooled heat dissipation system, which can ensure that the blower 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 heat dissipation system has high reliability.

[0107] The present utility model also provides a magnetic levitation rotating machine (preferably a rotating machine such as a motor, a blower, a ventilator or a compressor, etc.), which includes the aforementioned magnetic levitation bearing.

[0108] Figure 1 、 Figure 3 The internal axial bearing cooling path of the magnetic levitation machine (preferably a blower) of the present utility model is shown. Bearing stator ventilation holes are provided on both the axial stator one / two, and bearing stator ventilation grooves are opened in the coil slots, preferably in a radial shape, a circular shape, a spiral shape, etc. Several misaligned X-shaped inclined holes (which can exist independently as holes from the inside to the outside or holes from the outside to the inside, or can exist simultaneously) are opened on the thrust disc 3 in the axial and radial spaces from the inside to the outside and from the outside to the inside. One orifice of the inclined hole is directly opposite to the coil at the axial inner and outer magnetic poles, corresponding to the ventilation of the wire groove. The shape of the hole is not required for easy machining and process, and preferably a circular hole, a rectangular round hole or an oval hole. There are two cooling paths. The first cooling path intakes air through the ventilation holes on the axial stator, passes through the ventilation groove, the inner circle of the axial coil, and between the axial inner and outer magnetic poles, and then discharges through the inclined holes of the thrust disc; the second cooling path intakes air through the inclined holes of the thrust disc, passes through between the axial inner and outer magnetic poles of the axial stator, the inner circle of the axial coil, the axial stator ventilation groove, and then discharges through the axial stator ventilation holes (if there is only a hole from the inside to the outside or a hole from the outside to the inside independently, there is only one path). During operation, the intake direction of the inclined holes of the thrust disc is opposite to the rotation direction of the rotor. The thrust disc uses negative pressure to suck out the heat dissipation gas, increases the gas flow rate, accelerates the heat exchange between the thrust disc and the axial coil, and cooperates with the overall cooling path of the scheme to achieve an effective heat dissipation effect. In order to make the thrust disc intake air under 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 of the thrust disc is related to the intake direction of the thrust disc and the rotation direction of the rotor. If the left end of the thrust disc intakes air and the rotation direction of the rotor is clockwise when viewed from the right end, the thrust disc is a right-handed inclined hole. If the left end of the thrust disc intakes air and the rotation direction of the rotor is counterclockwise when viewed from the right end, the thrust disc is a left-handed inclined hole. Vice versa. If the directions do not match, the heat dissipation effect will be weakened and the heat dissipation efficiency will be reduced.

[0109] 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 in this technical field, without departing from the technical principle of the present utility model, several improvements and modifications can still be made, and these improvements and modifications 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 the thrust plate (3) is arranged between the axial stator (1) and the axial stator (2) in the axial direction of the magnetic bearing, and a first thrust plate ventilation hole (01) is provided on the thrust plate (3) from one axial end face to the other axial end face thereof, 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 provided in the coil slot (13), The axial stator 2 (2) comprises a radial outer portion 2 (21) and a radial inner portion 2 (22), One end of the first thrust plate ventilation hole (01) located on the other axial end face of the thrust plate (3) is located between the radial inner side 2 (22) of the axial stator 2 (2) and the rotor (6), and one end of the first thrust plate ventilation hole (01) located on the one axial end face of the thrust plate (3) is opposite to the position of the coil slot 1 (13) in the axial direction, and the first thrust plate ventilation hole (01) is not opposite to the magnetic pole position of the axial stator 1 (1).

2. The magnetic bearing according to claim 1, characterized in that: It also includes a pressure plate (4), the pressure plate (4) being located between the axial stator (1) and the thrust plate (3), and an axial end surface of the pressure plate (4) being connected to the radial outer side portion (11) of the axial stator (1), and the other axial end surface of the pressure plate (4) being opposite to the thrust plate (3); 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); a first gap (05) is provided between the pressure plate (4) and the radial inner portion (12); the first thrust disk ventilation hole (01) and the first gap (05) are opposite to each other in the axial direction, and a radial dimension of the first gap (05) is greater than or equal to a radial dimension of an end of the first thrust disk ventilation hole (01) opposite to the coil slot (13).

3. The magnetic bearing according to claim 2, characterized in that: In any radial cross section of the thrust disk (3), the cross-sectional area of ​​the magnetic path flow position of the axial stator one (1) = the radial cross-sectional area of ​​the thrust disk and the corresponding part of the axial stator one (1) - the cross-sectional area of ​​the first thrust disk ventilation hole (01) ≥ the cross-sectional area of ​​the magnetic pole position of the axial stator one (1).

4. The magnetic bearing according to claim 1, characterized in that: Inside the coil slot 1 (13), a second gap is provided between the radial inner side of the coil 1 (5) and the radial inner side portion 1 (12), forming a first gas flow path (06). 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 third 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 first thrust plate ventilation hole (01) through the first gas flow path (06).

5. The magnetic bearing according to claim 1, characterized in that: Along the axial direction of the thrust plate (3), the first 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 extension direction of the first thrust plate ventilation hole (01) 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 is toward a second rotation direction, and the second rotation direction is opposite to the first rotation direction.

6. The magnetic bearing according to claim 5, characterized in that: There are a plurality of first thrust plate ventilation holes (01), which are arranged at intervals along the circumferential direction of the thrust plate (3), and each of the first thrust plate ventilation holes (01) extends from the axial end face on the air inlet side of the thrust plate toward the axial end face on the air outlet side toward a second rotation direction, which is opposite to the first rotation direction of the thrust plate (3).

7. The magnetic bearing according to claim 1, characterized in that: The thrust disc (3) is provided with a second thrust disc ventilation hole (02) extending from the other axial end surface to the one axial end surface thereof, and the second thrust disc ventilation hole (02) is offset from the first thrust disc ventilation hole (01) and is not connected; The radial outer portion 2 (21) and the radial inner portion 2 (22) are spaced apart in the radial direction of the axial stator 2 (2), and a coil slot 2 (23) is formed therebetween. A coil 2 (5') is arranged in the coil slot 2 (23). One end of the second thrust plate ventilation hole (02) located on the axial one end face of the thrust plate (3) is located between the radial inner portion 1 (12) of the axial stator 1 (1) and the rotor (6). One end of the second thrust plate ventilation hole (02) located on the other axial end face of the thrust plate (3) is opposite to the position of the coil slot 2 (23) in the axial direction, and the second thrust plate ventilation hole (02) is not opposite to the magnetic pole position of the axial stator 2 (2).

8. The magnetic bearing according to claim 7, characterized in that: It also includes a second pressure plate (4'), the second pressure plate (4') is located between the second axial stator (2) and the thrust plate (3), and one axial end surface of the second pressure plate (4') is connected to the second radial outer portion (21) of the second axial stator (2), and the other axial end surface of the second pressure plate (4') is opposite to the thrust plate (3); The magnetic pole position of the axial stator 2 (2) includes a portion of the pressure plate 2 (4') opposite to the thrust plate (3), and a portion of the radial inner portion 2 (22) opposite to the thrust plate (3); a fourth gap (07) is provided between the pressure plate 2 (4') and the radial inner portion 2 (22); the second thrust plate ventilation hole (02) and the fourth gap (07) are opposite to each other in the axial direction, and a radial dimension of the fourth gap (07) is greater than or equal to a radial dimension of an end of the second thrust plate ventilation hole (02) opposite to the coil slot 2 (23).

9. The magnetic bearing according to claim 8, characterized in that: In each radial cross section of the thrust disk (3), the cross-sectional area of ​​the magnetic path flow position of the axial stator 2 (2) = the radial cross-sectional area of ​​the thrust disk and the corresponding part of the axial stator 2 (2) - the cross-sectional area of ​​the second thrust disk ventilation hole (02) ≥ the cross-sectional area of ​​the magnetic pole position of the axial stator 2 (2).

10. The magnetic bearing according to claim 7, characterized in that: Inside the coil slot 2 (23), a fifth gap is provided between the radial inner side of the coil 2 (5') and the radial inner portion 2 (22), forming a second gas flow path (08). 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 sixth 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 is further connected to the second thrust plate ventilation hole (02) through the second gas flow path (08).

11. The magnetic bearing according to claim 7, characterized in that: Along the axial direction of the thrust plate (3), the second thrust plate ventilation hole (02) 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 third rotation direction; the extension direction of the second thrust plate ventilation hole (02) 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 is toward a fourth rotation direction, and the fourth rotation direction is opposite to the third rotation direction.

12. The magnetic bearing according to claim 11, characterized in that: There are a plurality of second thrust plate ventilation holes (02), which are arranged at intervals along the circumferential direction of the thrust plate (3), and each of the second thrust plate ventilation holes (02) extends from the axial end face on the air inlet side of the thrust plate toward the axial end face on the air outlet side toward a fourth rotation direction, which is opposite to the third 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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