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. Thrust disc ventilation holes are formed in the thrust disc from one axial end face to the other axial end face in a penetrating mode, the first axial stator comprises a first radial outer side part and a first radial inner side part, the first radial outer side part and the first radial inner side part are arranged in the radial direction of the first axial stator in a spaced mode, a first coil groove is formed between the first radial outer side part and the first radial inner side part, and a first coil is arranged in the first coil groove; one end, located on one axial end face of the thrust disc, of the first thrust disc air inlet hole is opposite to the position of the first coil groove in the axial direction, and one end of the first thrust disc air inlet 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 Technique

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

[0003] The axial magnetic bearing realizes the axial movement of the rotating shaft. An essential axial force-bearing component on the rotating shaft is the thrust disc. The axial magnetic bearing and the thrust disc are made of a pure iron solid structure, with relatively large self-loss, general thermal conductivity, and narrow space. If not effectively cooled, they will generate serious heat. Usually, in order to avoid excessive temperature rise of the axial magnetic bearing, forced air cooling is often applied externally to dissipate heat from the magnetic bearing. The cooling air is input from the outside and passes through the gap between the bearing stator and the thrust 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. Content 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. Thrust disc ventilation holes are penetrated from one axial end face to the other axial end face of the thrust disc. The axial stator one includes a radially outer part one and a radially inner part one. The radially outer part one and the radially inner part one are spaced apart in the radial direction of the axial stator one, and a coil slot one is formed between the two, and a coil one is arranged in the coil slot one;

[0008] The thrust disc ventilation holes include a first thrust disc air inlet hole extending from one axial end face of the thrust disc towards the interior of the thrust disc, and a second thrust disc air inlet hole extending from the other axial end face of the thrust disc towards the interior of the thrust disc. One end of the first thrust disc air inlet hole located inside the thrust disc communicates with one end of the second thrust disc air inlet hole located inside the thrust disc. After communication, it is then communicated to the outer periphery of the thrust disc through a thrust disc air outlet hole. One end of the first thrust disc air inlet hole located at one axial end face of the thrust disc is axially opposite to the position of the coil slot one, and the one end of the first thrust disc air inlet hole is not opposite to the magnetic pole position of the axial stator one;

[0009] The axial stator one further includes an axial outer part one, and the axial outer part one is arranged away from the thrust disc relative to the coil one in the axial direction of the magnetic suspension bearing,

[0010] A bearing stator ventilation hole one is provided on the axial outer part one of the axial stator one. The bearing stator ventilation hole one penetrates from one axial end face of the axial outer part one to the other axial end face, and the bearing stator ventilation hole one can communicate with the first thrust disc air inlet hole.

[0011] In some embodiments,

[0012] Inside the coil slot one, a second gap is formed between the radially inner side of the coil one and the radially inner part one, forming a first gas flow path,

[0013] Inside the coil slot one, a third gap is also formed between the axial outer part one and the coil one, forming a bearing stator ventilation slot one;

[0014] The bearing stator ventilation hole one communicates with the bearing stator ventilation slot one, and further communicates with the first thrust disc air inlet hole through the first gas flow path.

[0015] In some embodiments,

[0016] It further includes a cover plate one. The cover plate one is located between the axial stator one and the thrust disc, and one axial end face of the cover plate one is connected to the axial outer part one of the axial stator one, and the other axial end face of the cover plate one is opposite to the thrust disc;

[0017] The magnetic pole position of the axial stator one includes the part where the cover plate one is opposite to the thrust disc and the part where the radially inner part one is opposite to the thrust disc. A first gap is formed between the cover plate one and the radially inner part one. The first thrust disc air inlet hole is axially opposite to the first gap, and the radial dimension of the first gap is greater than or equal to the radial dimension of the first thrust disc air inlet hole.

[0018] In some embodiments,

[0019] In any radial cross-section of the thrust disk, the cross-sectional area of the magnetic path flow-through position of the axial stator 1 = the radial cross-sectional area of the relative part of the thrust disk and the axial stator 1 - the cross-sectional area of the ventilation holes of the thrust disk - the cross-sectional area of the air outlet holes of the thrust disk ≥ the cross-sectional area of the magnetic pole position of the axial stator 1.

[0020] In some embodiments,

[0021] Along the axial direction of the thrust disk, the first thrust disk air inlet hole is a slant hole structure whose extending direction is not parallel to the axis of the thrust disk. From the observation direction of the axial one end face of the thrust disk towards its axial other end face, the rotation direction of the thrust disk is towards the first rotation direction, the extending direction of the first thrust disk air inlet hole from the axial one end face to the axial other end face is towards the second rotation direction, and the second rotation direction is opposite to the first rotation direction.

[0022] In some embodiments,

[0023] There are multiple first thrust disk air inlet holes, and the multiple first thrust disk air inlet holes are arranged at intervals along the circumferential direction of the thrust disk, and the extending direction of each first thrust disk air inlet hole from the axial one end face to the axial other end face is towards the second rotation direction, and is opposite to the first rotation direction of the thrust disk.

[0024] In some embodiments,

[0025] The axial stator 2 includes a radially outer part 2 and a radially inner part 2. The radially outer part 2 and the radially inner part 2 are spaced apart in the radial direction of the axial stator 2, and a coil slot 2 is formed therebetween. A coil 2 is arranged in the coil slot 2. One end of the second thrust disk air inlet hole located at the axial other end face of the thrust disk is axially opposite to the position of the coil slot 2, and this end of the second thrust disk air inlet hole is not opposite to the magnetic pole position of the axial stator 2;

[0026] The axial stator 2 further includes an axially outer part 2, and the axially outer part 2 is arranged away from the thrust disk relative to the coil 2 in the axial direction of the magnetic suspension bearing,

[0027] An air inlet hole 2 for the bearing stator is arranged on the axially outer part 2 of the axial stator 2. The air inlet hole 2 for the bearing stator penetrates from the axial one end face of the axially outer part 2 to the axial other end face, and the air inlet hole 2 for the bearing stator can communicate with the second thrust disk air inlet hole.

[0028] In some embodiments,

[0029] Inside the second coil slot, there is a fifth gap between the radially inner side of the second coil and the second radially inner part, forming a second gas flow path.

[0030] Inside the second coil slot, there is also a sixth gap between the second axially outer part and the second coil, forming a second bearing stator ventilation slot.

[0031] The second bearing stator ventilation hole communicates with the second bearing stator ventilation slot and further communicates with the second thrust disk air inlet hole through the second gas flow path.

[0032] In some embodiments,

[0033] It further includes a second cover plate. The second cover plate is located between the second axial stator and the thrust disk. One axial end face of the second cover plate is in contact with the second radially outer part of the second axial stator, and the other axial end face of the second cover plate faces the thrust disk.

[0034] The magnetic pole position of the second axial stator includes the part where the second cover plate faces the thrust disk and the part where the second radially inner part faces the thrust disk. There is a fourth gap between the second cover plate and the second radially inner part. The second thrust disk air inlet hole is axially opposite to the fourth gap, and the radial dimension of the fourth gap is greater than or equal to the radial dimension of the second thrust disk air inlet hole.

[0035] In some embodiments,

[0036] In each radial section of the thrust disk, the cross-sectional area of the magnetic circuit flowing position of the second axial stator = the radial cross-sectional area of the part of the thrust disk opposite to the second axial stator - the cross-sectional area of the thrust disk ventilation hole - the cross-sectional area of the thrust disk air outlet hole ≥ the cross-sectional area of the magnetic pole position of the second axial stator.

[0037] In some embodiments,

[0038] Along the axial direction of the thrust disk, the second thrust disk air inlet hole is an inclined hole structure whose extension direction is not parallel to the axis of the thrust disk. From the observation direction of the axial other end face of the thrust disk towards its axial one end face, the rotation direction of the thrust disk is towards the third rotation direction, and the extension direction of the second thrust disk air inlet hole from the axial other end face to the axial one end face is towards the fourth rotation direction, and the fourth rotation direction is opposite to the third rotation direction.

[0039] In some embodiments,

[0040] The second thrust disk air inlet holes are multiple, and the multiple second thrust disk air inlet holes are arranged at intervals along the circumferential direction of the thrust disk. Moreover, the extending direction of each second thrust disk air inlet hole from the axial other end face to the axial one end face is towards the fourth rotation direction, and is opposite to the third rotation direction of the thrust disk.

[0041] In some embodiments,

[0042] The first thrust disk air inlet holes, the thrust disk air outlet holes and the second thrust disk air inlet holes correspond to each other one by one, forming a set of air outlet units. There are multiple sets of the air outlet units, and the multiple sets of air outlet units are arranged at intervals along the circumferential direction of the thrust disk.

[0043] In some embodiments,

[0044] When the thrust disk satisfies magnetic saturation, the axial width of the magnetic circuit circulation area is at least N, and the axial aperture of the thrust disk air outlet hole = the axial thickness of the thrust disk - N.

[0045] In some embodiments,

[0046] The outer circumferences of the axial stator one and the axial stator two further have a housing. A stator outer ring hole is also provided at a position of the housing opposite to the thrust disk air outlet hole of the thrust disk, and can be used to connect with the thrust disk air outlet hole and exhaust outwards.

[0047] The present invention also provides a magnetic levitation rotating machine, which includes the aforementioned magnetic levitation bearing.

[0048] A magnetic levitation bearing and a magnetic levitation rotating machine provided by the present invention have the following beneficial effects:

[0049] 1. The utility model realizes self-actuated air suction and heat exchange through the thrust disc ventilation holes and thrust disc air outlet holes formed on the thrust disc. The thrust disc ventilation holes include a first thrust disc air inlet hole extending from one axial end face of the thrust disc towards the inside of the thrust disc and a second thrust disc air inlet hole extending from the other axial end face of the thrust disc towards the inside of the thrust disc. It can achieve self-actuated air suction and heat exchange through high rotational speed, increase the gas flow rate introduced, accelerate the cooling of the axial magnetic bearing, actively cool the thrust disc itself and increase the cooling flow rate to accelerate the heat dissipation of the axial coil, improve the cooling and heat dissipation effect of the magnetic levitation bearing, and make the first thrust disc air inlet hole not opposite to the magnetic pole position of the axial stator one, so that no hole is punched at the position of the thrust disc end face facing the magnetic pole of the axial stator one, preventing the cooling air from directly reaching the magnetic pole gap position, effectively avoiding the influence of the cooling gas and the holes on the magnetic furnace structure, thus avoiding insufficient magnetic levitation axial supporting force, achieving improved heat dissipation and cooling of the magnetic levitation bearing while avoiding affecting the magnetic levitation magnetic circuit, ensuring sufficient magnetic levitation supporting force, and effectively reducing the influence of gas acting force on the axial force; the utility model also preferably sets the thrust disc ventilation holes at the position corresponding to the coil between the upper and lower axial magnetic poles, and the aperture size ≤ 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 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 the air flow resistance at both ends of the thrust disc is small and the fluidity is good.

[0050] 2. The utility model further sets, in any radial section of the thrust disc, the relationship: 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 of the thrust disc opposite to the axial stator one - the cross-sectional area of the thrust disc ventilation holes - the cross-sectional area of the thrust disc air outlet holes ≥ the cross-sectional area of the magnetic pole position of the axial stator one, so that the other magnetic circuit parts of the thrust disc different from the magnetic pole position do 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 utility model also sets the first thrust disc air inlet 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 the hot air at one end and discharge it to the outside, increasing the gas flow rate introduced, realizing self-actuated ventilation and heat exchange of the thrust disc itself, accelerating the gas flow, saving energy consumption, and improving the heat dissipation performance and energy efficiency at the same time; at the same time, in cooperation with the bearing stator ventilation hole one provided on the outer part of the axis one and the stator ventilation groove one and the gas circulation path (multiple gas circulation paths) in the axial stator coil slot, it can further accelerate the gas flow in the cavity of the axial stator coil slot and realize the effective self-actuated heat dissipation of the axial coil and the thrust disc. Description of the Drawings

[0051] Figure 1 is the longitudinal sectional perspective view of the magnetic levitation bearing of the present utility model;

[0052] Figure 2 is Figure 1 the three-dimensional internal structure diagram of the thrust disk structure in

[0053] Figure 3 is the three-dimensional structure diagram of the axial stator core of the magnetic levitation bearing of the present utility model.

[0054] The reference numerals are shown as:

[0055] 1, Axial stator one; 11, Radial outer part one; 12, Radial inner part one; 13, Coil slot one; 14, Axial outer part one; 2, Axial stator two; 21, Radial outer part two; 22, Radial inner part two; 23, Coil slot two; 24, Axial outer part two; 3, Thrust disk; 4, Cover plate one; 4', Cover plate two; 5, Coil one; 5', Coil two; 6, Housing;

[0056] 01, First thrust disk air inlet hole; 02, Second thrust disk air inlet 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; 09, Thrust disk air outlet hole; 10, Stator outer ring hole. Detailed implementation manners

[0057] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way limits the present utility model and its application or use. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0058] It should be noted that the terms used herein are only for describing the specific implementation manners and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless otherwise clearly specified in the context, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "include" and / or "comprise" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or their combinations.

[0059] Unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions, and numerical values set forth 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 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 said 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 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.

[0060] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by orientation words 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, and is only for the convenience of describing the present utility model and simplifying the description. Without contrary description, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus cannot be construed as limiting the protection scope of the present utility model; the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0061] For the convenience of description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "above", etc. can be used here to describe the spatial positional relationship between a device or feature shown in the drawings 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 drawings 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 orientation of "above..." and "below...". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations should be made for the spatial relative descriptions used here.

[0062] In addition, it should be noted that the use of words such as "first", "second", etc. to limit components is only for the convenience of distinguishing the corresponding components. Without otherwise stating, the above words have no special meaning, and thus cannot be construed as limiting the protection scope of the present utility model.

[0063] AsFigures 1-3 As shown in the figure, the present utility model provides a magnetic levitation bearing, which includes:

[0064] Axial stator 1, axial stator 2 and thrust disc 3. In the axial direction of the magnetic levitation bearing, the thrust disc 3 is arranged between the axial stator 1 and the axial stator 2. A thrust disc ventilation hole runs through the thrust disc 3 from one axial end face to the other axial end face. The axial stator 1 includes a radially outer part 11 and a radially inner part 12. The radially outer part 11 and the radially inner part 12 are spaced apart in the radial direction of the axial stator 1, and a coil slot 13 is formed therebetween. A coil 5 is arranged in the coil slot 13;

[0065] The thrust disc ventilation hole includes a first thrust disc air inlet hole 01 extending from one axial end face of the thrust disc 3 into the interior of the thrust disc 3 and a second thrust disc air inlet hole 02 extending from the other axial end face of the thrust disc 3 into the interior of the thrust disc 3. One end of the first thrust disc air inlet hole 01 located inside the thrust disc 3 communicates with one end of the second thrust disc air inlet hole 02 located inside the thrust disc 3. After being connected, it is then connected to the outer periphery of the thrust disc 3 through a thrust disc air outlet hole 09. One end of the first thrust disc air inlet hole 01 located at one axial end face of the thrust disc 3 is axially opposite to the position of the coil slot 13, and this end of the first thrust disc air inlet hole 01 is not axially opposite to the magnetic pole position of the axial stator 1;

[0066] The axial stator 1 further includes an axially outer part 14. The axially 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.

[0067] An air bearing stator ventilation hole 03 is arranged on the axially outer part 14 of the axial stator 1. The air bearing stator ventilation hole 03 runs through from one axial end face of the axially outer part 14 to the other axial end face. The air bearing stator ventilation hole 03 can communicate with the first thrust disc air inlet hole 01.

[0068] The utility model realizes self-ventilation and heat exchange through the thrust disk ventilation holes and thrust disk air outlet holes formed on the thrust disk. The thrust disk ventilation holes include a first thrust disk air inlet hole extending from one axial end surface of the thrust disk towards the inside of the thrust disk and a second thrust disk air inlet hole extending from the other axial end surface of the thrust disk towards the inside of the thrust disk. It can actively suck air for heat exchange through high rotation speed, increase the gas flow rate, accelerate the cooling of the axial magnetic bearing, actively cool the thrust disk itself and increase the cooling flow rate to accelerate the heat dissipation of the axial coil, improve the cooling and heat dissipation effect on the magnetic levitation bearing, and make the first thrust disk air inlet hole not opposite to the magnetic pole position of the axial stator 1, which can prevent the thrust disk end surface from being drilled at the magnetic pole position directly facing the axial stator 1, so that the cooling air cannot directly reach 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 improved heat dissipation and cooling of the magnetic levitation bearing while avoiding affecting the magnetic levitation magnetic circuit, ensuring sufficient magnetic levitation supporting force, and effectively reducing the influence of gas force on the axial force; The utility model also has a bearing stator ventilation hole 1 on the axial outer part 1, and the bearing stator ventilation hole 1 can communicate with the first thrust disk air inlet hole, providing an air flow passage, which can further accelerate the gas flow in the cavity of the axial stator coil slot and realize the effective independent heat dissipation of the axial coil and the thrust disk.

[0069] In some embodiments,

[0070] Inside the coil slot 13, there is a second gap between the radial inner side of the coil 5 and the radial inner part 12, forming a first gas flow path 06.

[0071] 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.

[0072] The bearing stator ventilation hole 03 communicates with the bearing stator ventilation slot 04 and further communicates with the first thrust disk air inlet hole 01 through the first gas flow path 06.

[0073] The utility model can form multiple gas flow paths flowing from both sides towards the thrust disk ventilation holes of the middle thrust disk through the bearing stator ventilation hole 1 arranged on the axial outer part 1, as well as the stator ventilation slot 1 and gas flow path in the axial stator coil slot, which can further accelerate the gas flow in the cavity of the axial stator coil slot and realize the effective independent heat dissipation of the axial coil and the thrust disk.

[0074] In some embodiments,

[0075] It further includes a first cover plate 4, which is located between the first axial stator 1 and the thrust disk 3. One axial end face of the first cover plate 4 is in contact with the first radial outer part 11 of the first axial stator 1, and the other axial end face of the first cover plate 4 faces the thrust disk 3.

[0076] The magnetic pole positions of the first axial stator 1 include the part of the first cover plate 4 facing the thrust disk 3 and the part of the first radial inner part 12 facing the thrust disk 3. There is a first gap 05 between the first cover plate 4 and the first radial inner part 12. The first thrust disk air inlet hole 01 is axially opposite to the first gap 05, and the radial dimension of the first gap 05 is greater than or equal to the radial dimension of the first thrust disk air inlet hole 01.

[0077] The present utility model preferably sets the thrust disk ventilation holes at the positions directly opposite to the coils between the upper and lower axial magnetic poles, and the aperture size ≤ the radial distance between the upper and lower magnetic poles of the axial stator, which can enable the first thrust disk air inlet hole to further effectively avoid the magnetic pole positions, 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; and the bearing stator ventilation hole 1, the bearing stator ventilation groove 1, the first gas flow path, the first gap and the first thrust disk air inlet hole are sequentially connected to form an air flow passage.

[0078] In some embodiments,

[0079] In any radial section of the thrust disk 3, the cross-sectional area of the magnetic circuit flowing position of the first axial stator 1 = the radial cross-sectional area of the part of the thrust disk opposite to the first axial stator 1 - the cross-sectional area of the thrust disk ventilation hole - the cross-sectional area of the thrust disk air outlet hole 09 ≥ the cross-sectional area of the magnetic pole position of the first axial stator 1.

[0080] The present utility model further sets, in any radial section of the thrust disk, the relationship: the cross-sectional area of the magnetic circuit flowing position of the first axial stator = the radial cross-sectional area of the part of the thrust disk opposite to the first axial stator - the cross-sectional area of the thrust disk ventilation hole - the cross-sectional area of the thrust disk air outlet ≥ the cross-sectional area of the magnetic pole position of the first axial stator, so that other magnetic circuit parts on the thrust disk different from the magnetic pole positions will not show magnetic field saturation prior to the magnetic pole positions, ensuring the formation of a normal magnetic flux loop and ensuring the continuous and effective provision of the magnetic levitation supporting force.

[0081] In some embodiments,

[0082] Along the axial direction of the thrust disk 3, the first thrust disk air inlet hole 01 is an inclined hole structure whose extension direction is not parallel to the axis of the thrust disk 3. From the observation direction of one axial end face of the thrust disk 3 towards the other axial end face, the rotation direction of the thrust disk 3 is the first rotation direction, and the extension direction of the first thrust disk air inlet hole 01 from one axial end face to the other axial end face is towards the second rotation direction, and the second rotation direction is opposite to the first rotation direction.

[0083] The utility model also sets the first thrust disk air inlet hole so that its extension direction from one axial end face to the other axial end face is towards the second rotation direction, and the second rotation direction is opposite to the first rotation direction (the rotation direction of the thrust disk). When the rotor drives the thrust disk to rotate at a high speed, negative pressure can be generated to suck out the hot air at one end and discharge it to the outside, increasing the 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 and energy efficiency at the same time.

[0084] For the convenience of negative pressure air intake in the utility model, the direction of the inner ring air inlet is opposite to the rotation direction, the air inlet hole is > 90° with the rotation direction in the circumferential direction, and the air outlet hole is ≥ 90° with the rotation direction in the radial direction. There is no requirement for the hole shape. For the convenience of machining and process, circular holes, rectangular round holes or elliptical holes are preferred.

[0085] In some embodiments,

[0086] There are multiple first thrust disk air inlet holes 01, and the multiple first thrust disk air inlet holes 01 are arranged at intervals along the circumferential direction of the thrust disk 3, and the extension direction of each first thrust disk air inlet hole 01 from one axial end face to the other axial end face is towards the second rotation direction, and is opposite to the first rotation direction of the thrust disk 3.

[0087] The utility model provides a magnetically levitated rotating machine (preferably a blower) with active and efficient heat dissipation. The thrust disk adopts a Y-shaped inclined hole scheme to realize its own active air suction and heat exchange through high-speed rotation, increase the flow rate of the introduced gas, accelerate the cooling of the axial magnetic bearing, and at the same time cooperate with the overall active pure air cooling of the magnetically levitated rotating machine, using the coaxial impeller cooling at the other end of the main impeller or the negative pressure cooling of the rotor rotation or the leakage cooling of the main impeller, changing from the previous external passive heat dissipation to internal active heat dissipation, improving the heat dissipation efficiency and reducing the heat dissipation cost at the same time. This cooling scheme of the magnetically levitated rotating machine can effectively ventilate and dissipate heat for the motor stator, motor rotor, magnetic bearing, etc., and can also better dissipate heat for the axial magnetic bearing, improving the stability of the magnetic levitation system.

[0088] In some embodiments,

[0089] The axial stator two 2 includes a radially outer part two 21 and a radially inner part two 22. The radially outer part two 21 and the radially inner 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 disposed in the coil slot two 23. The second thrust plate air inlet hole 02 is located at one end of the other axial end face of the thrust plate 3 and is opposite to the position of the coil slot two 23 in the axial direction, and the one end of the second thrust plate air inlet hole 02 is not opposite to the magnetic pole position of the axial stator two 2;

[0090] The axial stator two 2 further includes an axially outer part two 24. The axially outer part two 24 is disposed away from the thrust plate 3 relative to the coil two 5' in the axial direction of the magnetic levitation bearing.

[0091] An air bearing stator vent hole two 03' is provided on the axially outer part two 24 of the axial stator two 2. The air bearing stator vent hole two 03' penetrates from one axial end face of the axially outer part two 24 to the other axial end face, and the air bearing stator vent hole two 03' can communicate with the second thrust plate air inlet hole 02.

[0092] In the present utility model, by further making the position of the second thrust plate air inlet hole at the other axial end face of the thrust plate 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 plate 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 also effectively reduce the influence of the gas acting force on the axial force; in the present utility model, by providing an air bearing stator vent hole one on the axially outer part one, and the air bearing stator vent hole one can communicate with the first thrust plate air inlet hole, an air flow passage can be provided, which can further accelerate the gas flow in the cavity of the axial stator coil slot and realize the effective self-cooling of the axial coil and the thrust plate.

[0093] In some embodiments,

[0094] Inside the coil slot two 23, there is a fifth gap between the radially inner side of the coil two 5' and the radially inner part two 22, forming a second gas flow path 08.

[0095] Inside the coil slot two 23, there is also a sixth gap between the axially outer part two 24 and the coil two 5', forming an air bearing stator vent groove two 04'.

[0096] The bearing stator ventilation hole two 03' communicates with the bearing stator ventilation groove two 04', and further communicates with the second thrust disk air inlet hole 02 through the second gas flow path 08.

[0097] In the utility model, the bearing stator ventilation hole two is arranged on the second axially outer part, and the stator ventilation groove two and the gas flow path in the axially stator coil groove can form multiple gas flow paths that flow from both sides towards the thrust disk ventilation hole in the middle thrust disk, which can further accelerate the gas flow in the cavity of the axially stator coil groove and realize the effective independent heat dissipation of the axial coil and the thrust disk.

[0098] In some embodiments,

[0099] It further includes a second cover plate 4'. The second cover plate 4' is located between the axial stator two 2 and the thrust disk 3, and one axial end face of the second cover plate 4' is connected to the second radially outer part 21 of the axial stator two 2, and the other axial end face of the second cover plate 4' faces the thrust disk 3;

[0100] The magnetic pole position of the axial stator two 2 includes the part where the second cover plate 4' faces the thrust disk 3 and the part where the second radially inner part 22 faces the thrust disk 3. There is a fourth gap 07 between the second cover plate 4' and the second radially inner part 22. The second thrust disk air inlet 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 the second thrust disk air inlet hole 02.

[0101] In the utility model, it is further preferred that the second thrust disk air inlet hole is arranged at the position directly opposite to the coil between the upper and lower magnetic poles of the axial stator two, and the aperture size ≤ the radial distance between the upper and lower magnetic poles of the axial stator, which can enable the second thrust disk air inlet hole to further effectively avoid the magnetic pole position, further avoid affecting the magnetic circuit, and the thrust disk ventilation hole is connected to the ventilation paths at both ends without obstruction, and can also make the air flow resistance at both ends of the thrust disk small and the fluidity good; and the bearing stator ventilation hole two, the bearing stator ventilation groove two, the second gas flow path, the second gap and the second thrust disk air inlet hole are sequentially connected to form an air flow channel.

[0102] In some embodiments,

[0103] In each radial section of the thrust disk 3, the cross-sectional area of the position where the magnetic circuit of the axial stator two 2 flows through = the radial cross-sectional area of the part of the thrust disk opposite to the axial stator two - the cross-sectional area of the thrust disk ventilation hole - the cross-sectional area of the thrust disk air outlet hole 09 ≥ the cross-sectional area of the magnetic pole position of the axial stator two 2.

[0104] In the present utility model, the ventilation holes of the thrust disk are further arranged between the upper and lower magnetic poles of the axial stator II and are directly opposite to the coils. Further, the aperture size of the ventilation holes of the thrust disk is ≤ the radial distance between the upper and lower magnetic poles of the axial stator II, which can further effectively avoid the magnetic pole positions of the axial stator II, further avoid affecting the magnetic circuit, and the ventilation holes of the thrust disk are connected to the ventilation paths at both ends without obstruction, and can also make the air flow resistance at both ends of the thrust disk small and the fluidity good.

[0105] In some embodiments,

[0106] Along the axial direction of the thrust disk 3, the second thrust disk air inlet hole 02 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 other end face of the thrust disk 3 towards its axial one end face, the rotation direction of the thrust disk 3 is towards the third rotation direction, and the extending direction of the second thrust disk air inlet hole 02 from the axial other end face to the axial one end face is towards the fourth rotation direction, and the fourth rotation direction is opposite to the third rotation direction.

[0107] In the present utility model, by further setting the second thrust disk air inlet hole to extend from the axial other end face to the axial one end face towards the fourth rotation direction, and the fourth rotation direction is opposite to the third 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.

[0108] Along the direction from the axial one end face to the axial other end face, the first rotation direction is the third rotation direction, the fourth rotation direction is the same as the second rotation direction, and the first and second thrust disk air inlet holes and the thrust disk air outlet hole together form a Y-shaped inclined hole, with air intake from both sides towards the middle and discharged through the thrust disk air outlet hole.

[0109] For facilitating negative pressure air intake, the direction of the inner ring air inlet is opposite to the rotation direction, the air inlet hole is > 90° from the rotation direction in the circumferential direction, and the air outlet hole is ≥ 90° from the rotation direction in the radial direction. There is no requirement for the hole shape. For facilitating machining and technology, circular holes, rectangular round holes or oval holes are preferred.

[0110] In some embodiments,

[0111] The second thrust disk air inlet hole 02 is multiple, and the multiple second thrust disk air inlet holes 02 are arranged at intervals along the circumferential direction of the thrust disk 3, and the extending direction of each second thrust disk air inlet hole 02 from the axial other end face to the axial one end face is towards the fourth rotation direction, and is opposite to the third rotation direction of the thrust disk 3.

[0112] In some embodiments,

[0113] The first thrust disk air inlet hole 01, the thrust disk air outlet hole 09, and the second thrust disk air inlet hole 02 correspond to each other one by one to form a set of air outlet units. There are multiple sets of the air outlet units, and the multiple sets of air outlet units are arranged at intervals in the circumferential direction of the thrust disk 3.

[0114] By providing multiple air outlet units, the present utility model can increase the air flow circulation area and circulation flow rate in the circumferential direction, and further improve the cooling and heat dissipation effect on the magnetic levitation bearing.

[0115] In some embodiments,

[0116] When the thrust disk 3 is magnetically saturated, the axial width of the magnetic circuit circulation area is at least N, and the axial aperture of the thrust disk air outlet hole 09 = the axial thickness of the thrust disk 3 - N. The present utility model preferably has the axial width of the magnetic circuit circulation area of the thrust disk being at least N when magnetically saturated, and the axial aperture of the air outlet = the thrust disk thickness - N, which can effectively ensure the largest heat dissipation channel while not affecting the axial magnetic circuit conduction.

[0117] In some embodiments,

[0118] The outer circumferences of the axial stator one 1 and the axial stator two 2 further have a housing 6. A stator outer ring hole 10 is also provided at a position of the housing 6 opposite to the thrust disk air outlet hole 09 of the thrust disk 3, which can be used to connect with the thrust disk air outlet hole 09 and exhaust outward.

[0119] Through the stator outer ring hole provided on the outermost housing of the present utility model, which is opposite to the thrust disk air outlet, the gas discharged from the thrust disk air outlet hole can be led out, so that the gas entering from the first and second thrust disk air inlet holes on both sides respectively can be discharged from the stator outer ring hole after cooling the coil, rotor and other structures of the magnetic levitation bearing, ensuring the smoothness of gas flow and improving the cooling effect.

[0120] The axial magnetic bearing of the present utility model preferably adopts active ventilation cooling. The thrust disk is installed on the rotor. Oblique holes are drilled on both sides near the inner ring of the part of the thrust disk facing the axial bearing ventilation groove to the middle, and then through holes are drilled upward to the outer ring surface of the thrust disk. Several Y-shaped oblique holes are circumferentially opened on the part of the thrust disk facing the axial bearing ventilation groove. 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 heat exchange of the thrust disk itself. 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 area of the axial bearing, realizing the effective independent heat dissipation of the axial magnetic bearing.

[0121] According to the principle of axial magnetic levitation bearings, the relative position of the thrust disk and the axial magnetic poles 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 poles directly, to avoid insufficient axial force. At the same time, the cooling air cannot directly reach the magnetic pole gap position to reduce the influence of gas reaction force on the axial force. Therefore, the magnetic levitation bearing requires that the cooling holes cannot be directly opposite the magnetic pole gap position. 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 air inlet is located at the position directly opposite the coil between the upper and lower axial magnetic poles, and the aperture size ≤ the radial spacing between the upper and lower magnetic poles of the axial stator. 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 as the hole position ≥ the cross-sectional area of the magnetic pole position. Preferably, when the thrust disk satisfies magnetic saturation, the minimum axial width of the magnetic circuit flow area is N, and the axial aperture of the air outlet = the thickness of the thrust disk - N, which ensures the largest heat dissipation channel while not affecting the conduction of the axial magnetic circuit. To facilitate negative pressure intake, the direction of the inner ring air inlet is opposite to the rotation direction, the intake holes are > 90° from the rotation direction in the circumferential direction, and the outlet holes are ≥ 90° from the rotation direction in the radial direction. There is no requirement for the hole shape. For the convenience of machining and technology, round holes, rectangular round holes or oval holes are preferred.

[0122] The entire system uses an active pure air-cooled heat dissipation system for heat dissipation. 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 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 an efficient and reliable heat dissipation process.

[0123] The beneficial effects of the present utility model are as follows:

[0124] 1. The present utility model sets Y-shaped inclined holes on the thrust disk for high-heat-generating components, and uses negative pressure to suck out the heat through the Y-shaped inclined hole flow channel. Oblique holes are drilled on both sides between the two magnetic poles of the thrust disk and converge to the middle, and then oblique holes are drilled upward to the outer ring surface of the thrust disk. The inner ring surface of the axial stator has through holes that cooperate with the air inlet of the Y-shaped hole of the thrust disk, which can actively cool and accelerate its own heat dissipation, increase the cooling flow rate without affecting the axial magnetic circuit;

[0125] 2. The present utility model provides an integrated high-efficiency pure air-cooled heat dissipation system. The active pure air-cooled heat dissipation system reduces the heat dissipation cost. Targeted ventilation of the heat-generating components can effectively accelerate cooling and improve reliability. It 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.

[0126] The present utility model also provides a magnetic levitation rotating machinery (preferably a rotating machinery such as a motor, a blower, a ventilator or a compressor, etc.), which includes the aforementioned magnetic levitation bearing.

[0127] Figure 1 The following shows the internal axial bearing cooling path of the magnetic levitation rotating machine (preferably a blower) of the present utility model. The first thrust disk air inlet hole 01 (oblique hole), the second thrust disk air inlet hole 02 (oblique hole), and the thrust disk air outlet hole 09 (oblique hole) form a Y-shaped oblique hole of the thrust disk. The air inlet of the Y-shaped hole of the thrust disk is located at the position opposite to the coil between the inner and outer axial magnetic poles, corresponding to the ventilation part of the wire groove. Ventilation grooves and ventilation holes are provided on the axial stator, and the ventilation holes communicate with the ventilation grooves. The ventilation grooves (the first and second gas flow paths) are in a radial shape, or a circular shape, or a spiral shape, etc. This cooling path is as follows: the cooling gas passes through the bearing stator ventilation hole 03 (bearing stator ventilation hole 03') → the bearing stator ventilation groove 04 (bearing stator ventilation groove 04') → the first gas flow path 06 (the second gas flow path 08) → the first gap 05 (the fourth gap 07), and converges from the first thrust disk air inlet hole 01 and the second thrust disk air inlet hole 02 on both sides of the thrust disk to the thrust disk air outlet hole 09 for discharge, effectively dissipating heat from the axial stator and the axial winding. During operation, the air inlet directions of the first and the thrust disk air inlet oblique holes are opposite to the rotation direction of the rotor. The gas in the ventilation groove is sucked into the thrust disk oblique hole by negative pressure and then discharged for heat dissipation. Such a cooling path achieves an effective self-cooling effect. To make the thrust disk intake air under negative pressure, the air inlet direction needs to be always opposite to the rotation direction of the rotor. Therefore, the rotation direction of the thrust disk oblique hole is related to the air inlet direction of the thrust disk and the rotation direction of the rotor. If the left end of the thrust disk intakes air and the rotation direction of the rotor is clockwise when viewed from the right end, the thrust disk is a right-handed oblique hole. If the left end of the thrust disk intakes air and the rotation direction of the rotor is counterclockwise when viewed from the right end, 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.

[0128] 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, and improvements 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 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 thrust plate ventilation hole is arranged on the thrust plate (3) from one axial end surface to the other axial end surface thereof, and the axial stator (1) comprises a radial outer portion (11) and a radial inner portion (12), and the radial outer portion (11) and the radial inner portion (12) are arranged at intervals in the radial direction of the axial stator (1), and a coil slot (13) is formed between the two, and a coil (5) is arranged in the coil slot (13); The thrust plate ventilation hole comprises a first thrust plate air inlet hole (01) extending from one axial end surface of the thrust plate (3) toward the interior of the thrust plate (3), and a second thrust plate air inlet hole (02) extending from the other axial end surface of the thrust plate (3) toward the interior of the thrust plate (3); one end of the first thrust plate air inlet hole (01) located inside the thrust plate (3) is connected with one end of the second thrust plate air inlet hole (02) located inside the thrust plate (3), and after being connected, it is connected to the outer periphery of the thrust plate (3) through the thrust plate air outlet hole (09); one end of the first thrust plate air inlet hole (01) located on one axial end surface of the thrust plate (3) is opposite to the position of the coil slot 1 (13) in the axial direction, and the one end of the first thrust plate air inlet hole (01) is not opposite to the magnetic pole position of the axial stator 1 (1); The axial stator (1) further comprises an axial outer portion (14), wherein the axial outer portion (14) is arranged in the axial direction of the magnetic bearing relative to the coil (5) and away from the thrust plate (3). A bearing stator ventilation hole (03) is provided on the axial outer side portion (14) of the axial stator (1), and the bearing stator ventilation hole (03) penetrates from one axial end surface of the axial outer side portion (14) to the other axial end surface, and the bearing stator ventilation hole (03) can be connected with the first thrust plate air inlet hole (01).

2. 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). Inside the coil slot one (13), there is also a third gap between the axial outer side one (14) and the coil one (5), forming a bearing stator ventilation slot one (04); The bearing stator ventilation hole 1 (03) is connected to the bearing stator ventilation groove 1 (04), and is further connected to the first thrust plate air inlet hole (01) through the first gas flow path (06).

3. The magnetic bearing according to claim 1, characterized in that: It also includes a cover plate (4), the cover plate (4) being located between the axial stator (1) and the thrust plate (3), and an axial end surface of the cover plate (4) being connected to the radial outer side portion (11) of the axial stator (1), and the other axial end surface of the cover plate (4) being opposite to the thrust plate (3); The magnetic pole position of the axial stator (1) includes a portion of the cover 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 cover plate (4) and the radial inner portion (12); the first thrust disk air inlet 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 the first thrust disk air inlet hole (01).

4. The magnetic bearing according to claim 3, 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 thrust disk ventilation hole - the cross-sectional area of ​​the thrust disk air outlet hole (09) ≥ the cross-sectional area of ​​the magnetic pole position of the axial stator one (1).

5. The magnetic bearing according to claim 1, characterized in that: Along the axial direction of the thrust plate (3), the first thrust plate air inlet hole (01) is an inclined hole structure whose extension direction is not parallel to the axis of the thrust plate (3); when observing from one axial end face of the thrust plate (3) toward the other axial end face thereof, the rotation direction of the thrust plate (3) is toward a first rotation direction; the extension direction of the first thrust plate air inlet hole (01) from one axial end face to the other axial end face 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 air inlet holes (01), which are arranged at intervals along the circumferential direction of the thrust plate (3), and an extension direction of each first thrust plate air inlet hole (01) from one axial end face to the other axial end face is 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 axial stator 2 (2) comprises 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, a coil 2 (5') is arranged in the coil slot 2 (23), and the second thrust plate air inlet hole (02) is located at one end of the other axial end surface of the thrust plate (3) and is opposite to the position of the coil slot 2 (23) in the axial direction, and the one end of the second thrust plate air inlet hole (02) is not opposite to the magnetic pole position of the axial stator 2 (2); The second axial stator (2) further comprises a second axial outer portion (24), wherein the second axial outer portion (24) is arranged in the axial direction of the magnetic bearing relative to the second coil (5') and away from the thrust plate (3), A bearing stator ventilation hole 2 (03') is provided on the axial outer side 2 (24) of the axial stator 2 (2), and the bearing stator ventilation hole 2 (03') penetrates from one axial end surface of the axial outer side 2 (24) to the other axial end surface, and the bearing stator ventilation hole 2 (03') can be connected with the second thrust plate air inlet hole (02).

8. 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). 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'); The bearing stator ventilation hole 2 (03') is connected to the bearing stator ventilation slot 2 (04'), and is further connected to the second thrust plate air inlet hole (02) through the second gas flow path (08).

9. The magnetic bearing according to claim 7, characterized in that: It also includes a second cover plate (4'), the second cover plate (4') is located between the second axial stator (2) and the thrust plate (3), and one axial end surface of the second cover 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 cover plate (4') is opposite to the thrust plate (3); The magnetic pole position of the axial stator 2 (2) includes a portion of the cover 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 cover plate 2 (4') and the radial inner portion 2 (22); the second thrust plate air inlet 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 the second thrust plate air inlet hole (02).

10. The magnetic bearing according to claim 9, 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 thrust disk ventilation hole - the cross-sectional area of ​​the thrust disk air outlet hole (09) ≥ the cross-sectional area of ​​the magnetic pole position of the axial stator 2 (2).

11. The magnetic bearing according to claim 1, characterized in that: Along the axial direction of the thrust plate (3), the second thrust plate air inlet 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 other axial end face of the thrust plate (3) toward one axial end face thereof, the rotation direction of the thrust plate (3) is toward a third rotation direction; the extension direction of the second thrust plate air inlet hole (02) from the other axial end face to the one axial end face 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 air inlet holes (02), which are arranged at intervals along the circumferential direction of the thrust plate (3), and an extension direction of each second thrust plate air inlet hole (02) from the other axial end face to the one axial end face is toward a fourth rotation direction, which is opposite to the third rotation direction of the thrust plate (3).

13. The magnetic bearing according to claim 12, characterized in that: The first thrust plate air inlet hole (01), the thrust plate air outlet hole (09) and the second thrust plate air inlet hole (02) correspond to each other one by one, forming a group of air outlet units. The air outlet units are multiple groups, and the multiple groups of air outlet units are arranged at intervals along the circumferential direction of the thrust plate (3).

14. The magnetic bearing according to claim 1, characterized in that: The thrust disk (3) has a minimum axial width of a magnetic path flow area of ​​N when magnetic saturation is achieved, and the axial aperture of the thrust disk air outlet hole (09) is equal to the axial thickness of the thrust disk (3) - N.

15. The magnetic bearing according to claim 1, characterized in that: The outer periphery of the axial stator one (1) and the axial stator two (2) also has a shell (6), and the shell (6) is also provided with a stator outer ring hole (10) at a position opposite to the thrust plate air outlet hole (09) of the thrust plate (3), which can be used to connect with the thrust plate air outlet hole (09) and exhaust air outward.

16. A magnetically suspended rotating machine, characterized in that: The invention comprises the magnetic bearing according to any one of claims 1 to 15.

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