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 portion and the first radial inner side portion 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 portion and the first radial inner side portion, and a first coil is arranged in the first coil groove. And the thrust disc ventilation holes are not opposite to the magnetic pole position of the first axial stator, and / or the thrust disc ventilation holes are not opposite to the magnetic pole position of the second 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 Technique

[0002] At present, the heat dissipation of magnetic levitation rotating machines is mainly external cooling equipment, usually external cooling fans, water cooling systems, heat exchangers, etc. The cost of equipment maintenance 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 the heat out, and the heat dissipation of internal components cannot be more effectively achieved, 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. It is necessary to have an axial force-bearing component on the rotating shaft, which 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, it will generate serious heat. Usually, in order to avoid too high a 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 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. Content of the Utility Model

[0005] Therefore, the technical problem to be solved by the utility model is to overcome the defect that the magnetic levitation bearing inside the rotating machine in the prior art has poor cooling and heat dissipation effect, 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] Axial stator one, axial stator two and 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 arranged at intervals in the radial direction of the axial stator one, and a coil groove one is formed between the two. A coil one is arranged in the coil groove one;

[0008] Thrust disk ventilation holes are arranged through the thrust disk from one axial end face to the other axial end face, and the thrust disk ventilation holes are not opposite to the magnetic pole positions of the axial stator one, and / or the thrust disk ventilation holes are not opposite to the magnetic pole positions of the axial stator two.

[0009] In some embodiments,

[0010] The magnetic pole position of the axial stator one includes the part of the outer radial portion one opposite to the thrust disc and the part of the inner radial portion one opposite to the thrust disc. In the axial direction, the thrust disc ventilation hole is located at a position opposite to the gap between the inner radial periphery of the inner radial portion one and the rotor.

[0011] In some embodiments,

[0012] The axial stator two includes an outer radial portion two and an inner radial portion two. The outer radial portion two and the inner radial portion two are spaced apart in the radial direction of the axial stator two, and a coil slot two is formed therebetween. A coil two is disposed in the coil slot two; the magnetic pole position of the axial stator two includes the part of the outer radial portion two opposite to the thrust disc and the part of the inner radial portion two opposite to the thrust disc. In the axial direction, the thrust disc ventilation hole is located at a position opposite to the gap between the inner radial periphery of the inner radial portion two and the rotor.

[0013] In some embodiments,

[0014] The aperture of the thrust disc ventilation hole < the radial distance between the inner radial portion one and the rotor, and the aperture of the thrust disc ventilation hole < the radial distance between the inner radial portion two and the rotor.

[0015] In some embodiments,

[0016] It further includes a housing, the housing is located on the outer periphery of the axial stator one, and at the same time the housing is also located on the outer periphery of the axial stator two; the axial stator one further includes an outer axial portion one, the outer axial portion one is arranged away from the thrust disc relative to the coil one in the axial direction of the magnetic suspension bearing, and the outer peripheral of the outer axial portion one extends to be connected with the housing;

[0017] The axial stator two further includes an outer axial portion two, the outer axial portion two is arranged away from the thrust disc relative to the coil two in the axial direction of the magnetic suspension bearing, and the outer peripheral of the outer axial portion two extends to be connected with the housing.

[0018] In some embodiments,

[0019] A bearing stator ventilation hole one is provided on the outer axial portion one, the bearing stator ventilation hole one penetrates from one axial end face of the outer axial portion one to the other axial end face, and the bearing stator ventilation hole one is located on the outer periphery of the outer radial portion one.

[0020] The first radially outer part, the thrust disk, and the second radially outer part all have a gap with the housing in the radial direction, forming an air flow passage space.

[0021] A second bearing stator ventilation hole is provided on the second axially outer part. The second bearing stator ventilation hole penetrates from one axial end face of the second axially outer part to the other axial end face, and the second bearing stator ventilation hole is located on the outer peripheral of the second radially outer part.

[0022] The first bearing stator ventilation hole, the air flow passage space, and the second bearing stator ventilation hole are sequentially connected to form a passage for air flow.

[0023] In some embodiments,

[0024] Along the axial direction of the thrust disk, the thrust disk ventilation hole is an inclined hole structure whose extension direction is not parallel to the axis of the thrust disk. From the observation direction from the axial end face on the air inlet side of the thrust disk to the axial end face on the air outlet side, the rotation direction of the thrust disk is the first rotation direction, and the extension direction of the thrust disk ventilation hole from the axial end face on the air inlet side of the thrust disk to 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.

[0025] In some embodiments,

[0026] There are multiple thrust disk ventilation holes. The multiple thrust disk ventilation holes are arranged at intervals along the circumferential direction of the thrust disk, and the extension direction of each thrust disk ventilation hole from the axial end face on the air inlet side of the thrust disk to the axial end face on the air outlet side is the second rotation direction, all opposite to the first rotation direction of the thrust disk.

[0027] The present invention also provides a magnetic levitation rotating machine, which includes the aforementioned magnetic levitation bearing.

[0028] A magnetic levitation bearing and a magnetic levitation rotating machine provided by the present invention have the following beneficial effects:

[0029] 1. The utility model realizes self - active air suction and heat exchange through the thrust disc ventilation holes opened on the thrust disc. By means of high rotational speed, it increases the flow rate of the introduced gas, accelerates the cooling of the axial magnetic bearing, can actively cool the thrust disc 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 thrust disc ventilation holes not opposite to the pole positions of the axial stators one and two. This enables no holes to be drilled at the position of the thrust disc end face facing 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 holes on the magnetic furnace structure, thus avoiding insufficient magnetic levitation axial supporting force. While realizing improved heat dissipation and cooling of the magnetic levitation bearing, it can also avoid affecting the magnetic levitation magnetic circuit, ensure sufficient magnetic levitation supporting force, and effectively reduce the influence of gas force on the axial force. The utility model also preferably sets the thrust disc ventilation holes at the gap between the axial lower pole and the rotor, and the aperture size ≤ the radial distance between the axial stator lower pole and the rotor, which can further effectively avoid the pole positions, further avoid affecting the magnetic circuit, and the thrust disc ventilation holes 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 disc small and the fluidity good.

[0030] 2. The utility model also forms a second air flow channel allowing air flow through the bearing stator ventilation hole one opened on the outer axial part one of the axial stator one, the bearing stator ventilation hole two opened on the outer axial part two of the axial stator two, and the air flow space formed between the housing, the outer radial part one, the outer radial part two and the thrust disc. This can further enhance the cooling and heat dissipation of the magnetic levitation bearing stator and improve the cooling and heat dissipation effect of the magnetic levitation bearing. And this second air flow channel is located radially outside the pole positions of the bearing stator one and also radially outside the pole positions of the bearing stator two, making it not opposite to the pole positions of the axial stators one and two, so that the cooling air cannot directly reach the pole gap position, further 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 realizing improved heat dissipation and cooling of the magnetic levitation bearing, it can also avoid affecting the magnetic levitation magnetic circuit, ensure sufficient magnetic levitation supporting force, and effectively reduce the influence of gas force on the axial force. And this second air flow channel is connected to the ventilation paths at both ends without obstruction, located outside the thrust disc, will not affect the thrust disc, and has good fluidity.

[0031] 3. The present utility model also sets the ventilation holes of the thrust disc to extend from one axial end face to the other axial end face in the 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 the hot air at one end and discharge it to the outside, increasing the gas flow rate, achieving the active ventilation and heat exchange of the thrust disc itself, accelerating the gas flow, saving energy consumption, improving the heat dissipation performance and also 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 disc. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a longitudinal sectional view of Embodiment 1 of the magnetic suspension bearing of the present utility model;

[0033] Figure 2 is Figure 1 a plan view of the thrust disc structure in (the thrust disc ventilation holes with right-handed inclined holes);

[0034] Figure 3 is a longitudinal sectional view of Embodiment 2 of the magnetic suspension bearing of the present utility model;

[0035] Figure 4 is Figure 3 a plan view of the thrust disc structure in (the thrust disc ventilation holes with left-handed inclined holes).

[0036] The reference numerals are shown as:

[0037] 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 disc; 4, Housing; 5, Coil one; 5', Coil two; 6, Rotor;

[0038] 01, Thrust disc ventilation holes; 02, Air flow space; 03, Bearing stator ventilation hole one; 03', Bearing stator ventilation hole two. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0039] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way limits the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0040] 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.

[0041] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationship. 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 authorization specification. In all the examples shown and discussed here, any specific value should be interpreted as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further discussed in the subsequent drawings.

[0042] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by orientation words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal", and "top, bottom" is usually based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention 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 therefore should not be construed as limiting the protection scope of the present invention; the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0043] For ease of description, spatial relative terms such as "above", "over", "on the upper surface", "upper" etc. may be used herein to describe the spatial positional relationship of one device or feature to other devices or features as shown in the figures. 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 figures. For example, if the device in the figures is inverted, a device described as "above" or "over" other devices or structures will then be positioned "below" or "under" the other devices or structures. Thus, the exemplary term "above" can include both orientations of "above" and "below". The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the corresponding explanations for the spatial relative descriptions used herein will be made accordingly.

[0044] In addition, it should be noted that the use of terms such as "first", "second" etc. to define components is only for the convenience of differentiating the corresponding components. Without additional statements, the above terms have no special meanings, and thus should not be construed as limiting the protection scope of the present utility model.

[0045] As Figures 1-4 shown, the present utility model provides a magnetic levitation bearing, which comprises:

[0046] 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 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;

[0047] A thrust disk ventilation hole 01 runs through the thrust disk 3 from one axial end face to the other axial end face, and the thrust disk ventilation hole 01 is not opposite to the magnetic pole position of the axial stator one 1, and / or the thrust disk ventilation hole 01 is not opposite to the magnetic pole position of the axial stator two 2.

[0048] The utility model realizes self - active air suction and heat exchange through the thrust disk ventilation holes opened on the thrust disk. By means of high rotation speed, it 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 holes not opposite to the pole positions of the axial stators one and two. This can prevent the thrust disk end face from being perforated at the position 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 holes on the magnetic furnace structure, thus avoiding insufficient magnetic suspension axial force. While improving the heat dissipation and cooling of the magnetic suspension bearing, it can also avoid affecting the magnetic suspension magnetic circuit, ensure sufficient magnetic suspension supporting force, and effectively reduce the influence of gas force on the axial force.

[0049] In some embodiments,

[0050] The pole positions of the axial stator one 1 include the part of the outer radial part one 11 opposite to the thrust disk 3 and the part of the inner radial part one 12 opposite to the thrust disk 3. In the axial direction, the thrust disk ventilation hole 01 is located at a position opposite to the gap between the inner radial circumference of the inner radial part one 12 and the rotor 6.

[0051] The utility model also preferably sets the thrust disk ventilation holes at positions opposite to the gaps between the axial stator one and the rotor, which can further effectively avoid the pole positions of the axial stator one, further avoid affecting the magnetic circuit, and the thrust disk ventilation holes 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.

[0052] In some embodiments,

[0053] The axial stator two 2 includes an outer radial part two 21 and an inner radial part two 22. 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, and a coil two 5' is arranged in the coil slot two 23; the pole positions of the axial stator two 2 include the part of the outer radial part two 21 opposite to the thrust disk 3 and the part of the inner radial part two 22 opposite to the thrust disk 3. In the axial direction, the thrust disk ventilation hole 01 is located at a position opposite to the gap between the inner radial circumference of the inner radial part two 22 and the rotor 6.

[0054] The present utility model also preferably sets the thrust disc ventilation holes at positions opposite to the gaps between the axial stator two and the rotor, which can further effectively avoid the magnetic pole positions of the axial stator two by the thrust disc ventilation holes, further avoid affecting the magnetic circuit, and the thrust disc ventilation holes 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 disc small and the fluidity good.

[0055] In some embodiments,

[0056] The aperture of the thrust disc ventilation hole 01 < the radial distance between the first radially inner part 12 and the rotor 6, and the aperture of the thrust disc ventilation hole 01 < the radial distance between the second radially inner part 22 and the rotor 6.

[0057] The present utility model also preferably sets the thrust disc ventilation holes at the gaps between the axial lower magnetic poles and the rotor, and the aperture size ≤ the radial distance between the axial stator lower magnetic poles and the rotor, which can further effectively avoid the magnetic pole positions by the thrust disc ventilation holes, further avoid affecting the magnetic circuit, and the thrust disc ventilation holes 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 disc small and the fluidity good.

[0058] In some embodiments,

[0059] It further includes a housing 4, the housing 4 is located on the outer periphery of the axial stator one 1, and at the same time the housing 4 is also located on the outer periphery of the axial stator two 2; the axial stator one 1 further includes an axially outer part one 14, the axially outer part one 14 is arranged away from the thrust disc 3 relative to the coil one 5 in the axial direction of the magnetic suspension bearing, and the radially outer periphery of the axially outer part one 14 extends to be connected to the housing 4;

[0060] The axial stator two 2 further includes an axially outer part two 24, the axially outer part two 24 is arranged away from the thrust disc 3 relative to the coil two 5' in the axial direction of the magnetic suspension bearing, and the radially outer periphery of the axially outer part two 24 extends to be connected to the housing 4.

[0061] The present utility model also adopts a preferred structural form provided between the axial stator one and the axial stator two and the housing, that is, the axial stator one and the axial stator two can be fixed to the outer peripheral housing through the axially outer part one and the axially outer part two respectively, and a space for gas flow can be formed between the housing, the thrust disc, the radially outer parts one and two, further enhancing the cooling and heat dissipation effect on the stator and the housing.

[0062] In some embodiments,

[0063] A bearing stator ventilation hole 03 is provided on the first axial outer part 14, and the bearing stator ventilation hole 03 penetrates from one axial end face of the first axial outer part 14 to the other axial end face, and the bearing stator ventilation hole 03 is located on the radial outer periphery of the first radial outer part 11.

[0064] There are intervals between the first radial outer part 11, the thrust disc 3 and the second radial outer part 21 and the housing 4 in the radial direction, forming an air flow passage space 02.

[0065] A bearing stator ventilation hole 03' is provided on the second axial outer part 24, and the bearing stator ventilation hole 03' penetrates from one axial end face of the second axial outer part 24 to the other axial end face, and the bearing stator ventilation hole 03' is located on the radial outer periphery of the second radial outer part 21.

[0066] The bearing stator ventilation hole 03, the air flow passage space 02 and the bearing stator ventilation hole 03' are sequentially connected to form a passage for air flow.

[0067] The present utility model can also form a second air flow channel allowing air flow through the bearing stator ventilation hole 03 opened on the first axial outer part of the first axial stator, the bearing stator ventilation hole 03' opened on the second axial outer part of the second axial stator, and the air flow passage space formed between the housing, the first radial outer part, the second radial outer part and the thrust disc, which can further enhance the cooling and heat dissipation of the magnetic suspension bearing stator, improve the cooling and heat dissipation effect of the magnetic suspension bearing, and the second air flow channel is located radially outside the magnetic pole positions of the first bearing stator and also radially outside the magnetic pole positions of the second bearing stator, so that it is not opposite to the magnetic pole positions of the first and second axial stators, so that the cooling air cannot directly reach the magnetic pole gap position, which can further effectively avoid the influence of the cooling gas and the opening on the magnetic furnace structure, thus avoiding insufficient magnetic suspension axial support force, realizing the improvement of heat dissipation and cooling of the magnetic suspension bearing while avoiding the influence on the magnetic suspension magnetic circuit, ensuring sufficient magnetic suspension support force, effectively reducing the influence of gas force on the axial force, and the second air flow channel is connected to the ventilation paths at both ends without obstruction, located outside the thrust disc, and will not affect the thrust disc, and has good fluidity.

[0068] In some embodiments,

[0069] 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 towards the second rotation direction, and the second rotation direction is opposite to the first rotation direction.

[0070] The present utility model also sets the thrust disk ventilation hole to extend from the axial end face on the air inlet side towards the axial end face on the air outlet side in 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 flow rate of the introduced gas, realizing the active ventilation and heat exchange of the thrust disk itself, accelerating the gas flow, saving energy consumption, and improving the heat dissipation performance while also improving the energy efficiency.

[0071] In some embodiments,

[0072] 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. Moreover, 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 towards the second rotation direction, and all are opposite to the first rotation direction of the thrust disk 3.

[0073] The present utility model provides a magnetically levitated rotating machine (preferably a blower) with active and efficient heat dissipation. The thrust disk adopts an inclined hole solution to achieve its own active air suction and heat exchange through high rotation speed, increasing the flow rate of the introduced gas, 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 at the other end of the main impeller for cooling 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.

[0074] The axial magnetic bearing of the present utility model preferably 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 opened in the circumferential direction of the thrust disk. The air inlet direction is opposite to the rotation direction of the rotor. When the rotor drives the thrust disk to rotate at a high speed, negative pressure is generated to suck out the hot air at one end and discharge it to the outside, increasing the flow rate of the introduced gas, realizing the active ventilation and heat exchange of the thrust disk itself, accelerating the gas flow, and at the same time cooperating 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.

[0075] According to the principle of axial magnetic levitation bearing, the relative position between the thrust disk and the axial magnetic pole is the 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 field 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 on 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. There is no blockage at both ends, and the air flow resistance at both ends is small, with good fluidity.

[0076] For the heat dissipation of the entire system of the present utility model, an active pure air-cooled heat dissipation system is preferably adopted. The cold air is driven by a coaxial impeller at the other end of the main impeller, or enters by the centrifugal intake of the rotor rotation, or enters through the leakage of the main impeller. No additional heat dissipation drive motor is required. The flow rate of the heat dissipation 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.

[0077] The beneficial effects of the present utility model are as follows:

[0078] 1. The present utility model sets inclined holes in the non-magnetic part of the thrust disk for high-heat-generating components, and uses negative pressure to suck out the heat through the inclined hole flow channel. It 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. Targeted ventilation for heat-generating components can effectively accelerate cooling and improve reliability, increase the cooling flow rate and does not affect the axial magnetic circuit;

[0079] 2. The present utility model also cooperates with the overall flow channel structure layout of the machine, and conducts targeted ventilation and heat dissipation on the heat-generating components to achieve effective ventilation and cooling of the overall heat-generating components of the magnetic levitation rotating machinery, and improve the stability of the magnetic levitation system; realize an integrated high-efficiency pure air-cooled heat dissipation system, which can ensure that the magnetic levitation rotating machinery 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.

[0080] The present utility model also provides a magnetic levitation rotating machinery (preferably rotating machinery such as motors, blowers, ventilators or compressors), which includes the aforementioned magnetic levitation bearing.

[0081] Figure 1 、 Figure 3The following shows the internal axial bearing cooling path of the magnetic levitation machine (preferably a blower) of the present utility model. Oblique holes (thrust disc ventilation holes 01) are provided on the thrust disc 3, and bearing stator ventilation holes are provided on both the first / second axial stators. This cooling path is divided into two heat dissipation paths. The first path: during operation, the intake direction of the oblique holes on 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 from the left end. When working, the heat at the left end flows through the flow channel of the oblique holes on the thrust disc and is sucked into the lower cavity of the second axial stator from the lower cavity of the first axial stator, increasing the gas flow rate and accelerating heat exchange. The second path: the cooling gas flows rapidly through the ventilation holes on the axial stator, 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 cooling path of the scheme to achieve an effective heat dissipation effect. To make the thrust disc intake with negative pressure, the intake direction needs to be always opposite to the rotation direction of the rotor. Therefore, the rotation direction of the oblique holes on the thrust disc is related to the intake direction of the thrust disc 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 disc intakes air, the thrust disc has right-handed oblique holes. If the rotor rotates counterclockwise when viewed from the right end when the left end of the thrust disc intakes air, it is a left-handed oblique hole. Vice versa. If the directions do not match, the heat dissipation effect will be weakened and the heat dissipation efficiency will be reduced.

[0082] 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 in 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 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 the thrust plate (3) is arranged between the axial stator (1) and the axial stator (2) in the axial direction of the magnetic bearing, 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) being 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); a thrust plate ventilation hole (01) is arranged on the thrust plate (3) from one axial end face to the other axial end face thereof, and the thrust plate ventilation hole (01) is not opposite to the magnetic pole position of the axial stator (1), and / or the thrust plate ventilation hole (01) is not opposite to the magnetic pole position of the axial stator (2).

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 radial outer portion (11) opposite to the thrust disk (3), and a portion of the radial inner portion (12) opposite to the thrust disk (3), and 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 portion (12) and the rotor (6).

3. The magnetic bearing according to claim 2, characterized in that: The axial stator 2 (2) includes a radial outer portion 2 (21) and a radial inner portion 2 (22), wherein 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, wherein a coil 2 (5') is arranged in the coil slot 2 (23); the magnetic pole position of the axial stator 2 (2) includes a portion of the radial outer portion 2 (21) opposite to the thrust disk (3), and a portion of the radial inner portion 2 (22) opposite to the thrust disk (3), and 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 portion 2 (22) and the rotor (6).

4. The magnetic bearing according to claim 3, 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).

5. The magnetic bearing according to claim 3, characterized in that: It also includes a shell (4), the shell (4) is located on the outer periphery of the axial stator 1 (1), and the shell (4) is also located on the outer periphery of the axial stator 2 (2); the axial stator 1 (1) also includes an axial outer portion 1 (14), the axial outer portion 1 (14) is arranged in the axial direction of the magnetic bearing relative to the coil 1 (5) and away from the thrust plate (3), and the radial outer periphery of the axial outer portion 1 (14) extends to connect with the shell (4); The axial stator 2 (2) also includes an axial outer portion 2 (24), which is arranged in the axial direction of the magnetic bearing relative to the coil 2 (5') and away from the thrust plate (3), and the radial outer periphery of the axial outer portion 2 (24) extends to connect with the shell (4).

6. The magnetic bearing according to claim 5, characterized in that: The axial outer portion (14) is provided with a bearing stator ventilation hole (03), the bearing stator ventilation hole (03) penetrates from one axial end surface of the axial outer portion (14) to the other axial end surface, and the bearing stator ventilation hole (03) is located on the radial outer periphery of the radial outer portion (11), The radial outer portion 1 (11), the thrust plate (3) and the radial outer portion 2 (21) are all spaced apart from the housing (4) in the radial direction to form an airflow circulation space (02). The second axial outer portion (24) is provided with a second bearing stator ventilation hole (03'), the second bearing stator ventilation hole (03') penetrates from one axial end surface of the second axial outer portion (24) to the other axial end surface, and the second bearing stator ventilation hole (03') is located on the radial outer periphery of the second radial outer portion (21); The bearing stator ventilation hole 1 (03), the airflow circulation space (02) and the bearing stator ventilation hole 2 (03') are connected in sequence to form an airflow circulation passage.

7. The magnetic bearing according to claim 1, 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.

8. The magnetic bearing according to claim 7, 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).

9. A magnetically suspended rotating machine, characterized in that: The invention comprises the magnetic bearing according to any one of claims 1 to 8.

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