Magnetic suspension bearing and magnetic suspension rotating machine

Abstract

The invention provides a magnetic suspension bearing and a magnetic suspension rotating machine, the magnetic suspension bearing comprises a first axial stator, a second axial stator and a thrust disc, in the axial direction of the magnetic suspension bearing, the thrust disc is arranged between the first axial stator and the second axial stator, and the thrust disc is arranged between the first axial stator and the second axial stator; 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, the influence on a magnetic suspension magnetic circuit can be avoided, and enough magnetic suspension supporting force is guaranteed.

Description

Technical Field

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

[0002] At present, the heat dissipation of magnetic levitation rotating machinery is mainly external cooling equipment, usually external cooling fans, water cooling systems and heat exchangers, etc., which have high equipment maintenance costs, complex structural systems, and increased safety hazards. Or in the form of negative pressure, the air is sucked from the magnetic levitation rotating machinery to guide the heat out, which cannot more effectively achieve the heat dissipation of internal components, especially the heat dissipation of axial magnetic bearings is not sufficient, affecting the stable operation of the magnetic levitation air compressor.

[0003] The axial magnetic bearing realizes the axial movement of the rotating shaft, and an axial force-bearing component is indispensable on the rotating shaft, which is the thrust plate. The axial magnetic bearing and the thrust plate are made of pure iron solid structure, which has relatively large self-loss, general thermal conductivity and small space. If it is not effectively cooled, it 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 the heat of the magnetic bearing. The cooling air is input from the outside and dissipates the heat of the axial magnetic bearing through the gap between the bearing stator and the thrust plate, but the heat dissipation efficiency is not high.

[0004] Since the magnetic suspension bearing inside the rotating machine in the prior art has technical problems such as poor cooling and heat dissipation effect, the present invention studies and designs a magnetic suspension bearing and a magnetic suspension rotating machine. Summary of the invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defect of poor cooling and heat dissipation effect of the magnetic suspension bearing inside the rotating machine in the prior art, thereby providing a magnetic suspension bearing and a magnetic suspension rotating machine.

[0006] In order to solve the above problems, the present invention provides a magnetic bearing, which includes:

[0007] Axial stator 1, axial stator 2 and thrust plate, in the axial direction of the magnetic bearing, the thrust plate is arranged between the axial stator 1 and the axial stator 2, the thrust plate is provided with thrust plate ventilation holes from the axial end face to the other axial end face, the axial stator 1 includes a radial outer portion 1 and a radial inner portion 1, the radial outer portion 1 and the radial inner portion 1 are arranged at intervals in the radial direction of the axial stator 1, and a coil slot 1 is formed between the two, and a coil 1 is arranged in the coil slot 1;

[0008] The thrust plate ventilation hole comprises a first thrust plate air inlet hole extending from one axial end face of the thrust plate toward the interior of the thrust plate, and a second thrust plate air inlet hole extending from the other axial end face of the thrust plate toward the interior of the thrust plate, one end of the first thrust plate air inlet hole located inside the thrust plate is connected with one end of the second thrust plate air inlet hole located inside the thrust plate, and then connected to the outer periphery of the thrust plate through the thrust plate air outlet hole, one end of the first thrust plate air inlet hole located on one axial end face of the thrust plate is opposite to the position of the coil slot one in the axial direction, and the one end of the first thrust plate air inlet hole is not opposite to the magnetic pole position of the axial stator one;

[0009] The axial stator 1 also includes an axial outer portion 1, and the axial outer portion 1 is arranged away from the thrust plate relative to the coil 1 in the axial direction of the magnetic bearing.

[0010] A bearing stator ventilation hole is provided on the axial outer side portion 1 of the axial stator 1. The bearing stator ventilation hole runs through from one axial end surface of the axial outer side portion 1 to the other axial end surface. The bearing stator ventilation hole can be connected to the first thrust plate air inlet hole.

[0011] In some embodiments,

[0012] Inside the coil slot 1, a second gap is provided between the radial inner side of the coil 1 and the radial inner portion 1, forming a first gas flow path.

[0013] Inside the coil slot 1, there is also a third gap between the axial outer portion 1 and the coil 1, forming a bearing stator ventilation slot 1;

[0014] The bearing stator ventilation hole 1 is connected to the bearing stator ventilation slot 1, and is further connected to the first thrust plate air inlet hole through the first gas flow path.

[0015] In some embodiments,

[0016] It also includes a cover plate 1, the cover plate 1 is located between the axial stator 1 and the thrust plate, and an axial end surface of the cover plate 1 is connected to the radial outer side portion 1 of the axial stator 1, and the other axial end surface of the cover plate 1 is opposite to the thrust plate;

[0017] The magnetic pole position of the axial stator 1 includes a portion of the cover plate 1 opposite to the thrust plate, and a portion of the radial inner portion 1 opposite to the thrust plate, a first gap is provided between the cover plate 1 and the radial inner portion 1, the first thrust plate air inlet hole is opposite to the first gap in the axial direction, and a radial dimension of the first gap is greater than or equal to a radial dimension of the first thrust plate air inlet hole.

[0018] In some embodiments,

[0019] In any radial cross section of the thrust plate, the cross-sectional area of ​​the magnetic path flow position of the axial stator 1 = the radial cross-sectional area of ​​the thrust plate and the corresponding part of the axial stator 1 - the cross-sectional area of ​​the thrust plate ventilation hole - the cross-sectional area of ​​the thrust plate air outlet hole ≥ 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 plate, the first thrust plate air inlet hole is an inclined hole structure whose extension direction is not parallel to the axis of the thrust plate, and in the observation direction from one axial end face of the thrust plate to the other axial end face thereof, the rotation direction of the thrust plate is toward a first rotation direction, and the extension direction of the first thrust plate air inlet hole 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.

[0022] In some embodiments,

[0023] There are multiple first thrust plate air inlet holes, which are arranged at intervals along the circumferential direction of the thrust plate, and an extension direction of each of the first thrust plate air inlet holes 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.

[0024] In some embodiments,

[0025] The second axial stator comprises a second radial outer portion and a second radial inner portion, the second radial outer portion and the second radial inner portion are spaced apart in the radial direction of the second axial stator, and a second coil slot is formed therebetween, a second coil slot is provided in the second coil slot, the second thrust plate air inlet hole is located at one end of the other axial end surface of the thrust plate and is opposite to the position of the second coil slot in the axial direction, and the one end of the second thrust plate air inlet hole is not opposite to the magnetic pole position of the second axial stator;

[0026] The second axial stator further includes a second axial outer portion, and the second axial outer portion is arranged in the axial direction of the magnetic bearing relative to the second coil and away from the thrust plate.

[0027] A bearing stator ventilation hole 2 is provided on the axial outer portion 2 of the axial stator 2. The bearing stator ventilation hole 2 penetrates from one axial end surface of the axial outer portion 2 to the other axial end surface. The bearing stator ventilation hole 2 can be connected to the air inlet hole of the second thrust plate.

[0028] In some embodiments,

[0029] Inside the coil slot 2, a fifth gap is provided between the radial inner side of the coil 2 and the radial inner portion 2 to form a second gas flow path.

[0030] Inside the coil slot 2, there is also a sixth gap between the axially outer portion 2 and the coil 2, forming a bearing stator ventilation slot 2;

[0031] The bearing stator ventilation hole 2 is connected to the bearing stator ventilation slot 2, and is further connected to the second thrust plate air inlet hole through the second gas flow path.

[0032] In some embodiments,

[0033] It also includes a second cover plate, the second cover plate is located between the second axial stator and the thrust plate, and one axial end surface of the second cover plate is connected to the second radial outer portion of the second axial stator, and the other axial end surface of the second cover plate is opposite to the thrust plate;

[0034] The magnetic pole position of the axial stator 2 includes a portion of the cover plate 2 opposite to the thrust plate, and a portion of the radial inner portion 2 opposite to the thrust plate, a fourth gap is provided between the cover plate 2 and the radial inner portion 2, the second thrust plate air inlet hole is opposite to the fourth gap in the axial direction, and a radial dimension of the fourth gap is greater than or equal to a radial dimension of the second thrust plate air inlet hole.

[0035] In some embodiments,

[0036] In each radial cross section of the thrust plate, the cross-sectional area of ​​the magnetic path flow position of the axial stator 2 = the radial cross-sectional area of ​​the thrust plate and the corresponding part of the axial stator 2 - the cross-sectional area of ​​the thrust plate ventilation hole - the cross-sectional area of ​​the thrust plate air outlet hole ≥ the cross-sectional area of ​​the magnetic pole position of the axial stator 2.

[0037] In some embodiments,

[0038] Along the axial direction of the thrust plate, the second thrust plate air inlet hole is an inclined hole structure whose extension direction is not parallel to the axis of the thrust plate, and when observing from the other axial end face of the thrust plate toward one axial end face, the rotation direction of the thrust plate is toward a third rotation direction, and the extension direction of the second thrust plate air inlet hole 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.

[0039] In some embodiments,

[0040] There are multiple air inlet holes of the second thrust plate, which are arranged at intervals along the circumferential direction of the thrust plate, and an extension direction of each of the air inlet holes of the second thrust plate from the other axial end face to the one axial end face is toward the fourth rotation direction, which is opposite to the third rotation direction of the thrust plate.

[0041] In some embodiments,

[0042] The first thrust plate air inlet, the thrust plate air outlet and the second thrust plate air inlet correspond to each other one by one to form a group of air outlet units. There are multiple groups of air outlet units, and the multiple groups of air outlet units are arranged at intervals along the circumferential direction of the thrust plate.

[0043] In some embodiments,

[0044] When the thrust plate meets magnetic saturation, the minimum axial width of the magnetic path flow area is N, and the axial aperture of the air outlet hole of the thrust plate = the axial thickness of the thrust plate - N.

[0045] In some embodiments,

[0046] The outer periphery of the axial stator 1 and the axial stator 2 also has a shell, and the position of the shell opposite to the thrust plate air outlet of the thrust plate is also provided with a stator outer ring hole, which can be used to connect with the thrust plate air outlet and exhaust air outward.

[0047] The present invention also provides a magnetic suspension rotating machine, which includes the above-mentioned magnetic suspension bearing.

[0048] The magnetic suspension bearing and magnetic suspension rotating machine provided by the present invention have the following beneficial effects:

[0049] 1. The present invention provides thrust plate ventilation holes and thrust plate air outlet holes on the thrust plate, wherein the thrust plate ventilation holes include a first thrust plate air inlet hole extending from one axial end face of the thrust plate toward the inside of the thrust plate, and a second thrust plate air inlet hole extending from the other axial end face of the thrust plate toward the inside of the thrust plate. The thrust plate ventilation holes can realize self-active air suction and heat exchange through high rotation speed, increase the gas flow rate introduced, accelerate the cooling of the axial magnetic bearing, actively cool the thrust plate 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 suspension bearing, and the first thrust plate air inlet hole is not opposite to the magnetic pole position of the axial stator one, so that the end face of the thrust plate is not punched at the magnetic pole position facing the axial stator one, so that the cooling However, the air cannot directly reach the position of the magnetic pole gap, which can effectively avoid the cooling gas and the opening from affecting the magnetic furnace structure, thereby avoiding insufficient axial supporting force of the magnetic suspension, achieving improved heat dissipation and cooling of the magnetic suspension bearing while avoiding affecting the magnetic suspension magnetic circuit, ensuring sufficient magnetic suspension supporting force, and effectively reducing the influence of the gas force on the axial force; the present invention also preferably arranges the thrust plate ventilation hole between the axial upper and lower magnetic poles directly opposite the coil, and the aperture size is ≤ the radial spacing between the axial upper and lower magnetic poles of the stator, which can make the thrust plate ventilation hole further effectively avoid the magnetic pole position, further avoid affecting the magnetic circuit, and the thrust plate ventilation hole is connected to the ventilation paths at both ends without obstruction, which can also make the airflow resistance at both ends of the thrust plate small and the fluidity good.

[0050] 2. The present invention further sets the relationship in any radial cross section of the thrust plate: the cross-sectional area of ​​the magnetic path flow position of the axial stator 1 = the radial cross-sectional area of ​​the thrust plate and the corresponding part of the axial stator 1 - the cross-sectional area of ​​the thrust plate ventilation hole - the cross-sectional area of ​​the thrust plate air outlet hole ≥ the cross-sectional area of ​​the magnetic pole position of the axial stator 1, so that other magnetic path parts on the thrust plate that are different from the magnetic pole position will not experience magnetic field saturation before the magnetic pole position, thereby ensuring the formation of a normal magnetic flux circuit and ensuring the continuous and effective provision of the magnetic suspension support force; the present invention further sets the first thrust plate air inlet hole so that the extension direction from one axial end face to the other axial end face is toward the second rotation direction, and The second rotation direction is opposite to the first rotation direction (rotation direction of the thrust plate), and can generate negative pressure when the rotor drives the thrust plate to rotate at high speed to suck out the hot air at one end and discharge it to the outside, thereby increasing the gas flow rate, realizing active ventilation and heat exchange of the thrust plate itself, accelerating the gas flow, saving energy consumption, improving the heat dissipation performance and also improving energy efficiency; at the same time, in conjunction with the bearing stator ventilation hole provided on the axial outer side, and the stator ventilation groove and the gas flow path (multiple gas flow paths) in the axial stator coil slot, the gas flow in the axial stator coil slot cavity can be further accelerated, thereby realizing effective autonomous heat dissipation of the axial coil and the thrust plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1is a longitudinal sectional stereoscopic view of the magnetic suspension bearing of the present invention;

[0052] Figure 2 yes Figure 1 A three-dimensional internal structure diagram of the thrust plate structure;

[0053] Figure 3 It is a three-dimensional structural diagram of the axial stator core of the magnetic suspension bearing of the present invention.

[0054] The reference numerals are:

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

[0056] 01. First thrust plate air inlet; 02. Second thrust plate air inlet; 03. Bearing stator ventilation hole one; 03', bearing stator ventilation hole two; 04. Bearing stator ventilation slot one; 04', bearing stator ventilation slot two; 05. First gap; 06. First gas flow path; 07. Fourth gap; 08. Second gas flow path; 09. Thrust plate air outlet; 10. Stator outer ring hole. DETAILED DESCRIPTION

[0057] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0058] 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, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0059] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0060] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0061] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0062] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0063] like Figure 1-3As shown, the present invention provides a magnetic bearing, which includes:

[0064] An axial stator 1, an axial stator 2 and a thrust plate 3. In the axial direction of the magnetic bearing, the thrust plate 3 is arranged between the axial stator 1 and the axial stator 2. A thrust plate ventilation hole is provided on the thrust plate 3 from one axial end face to the other axial end face. The axial stator 1 includes a radial outer portion 11 and a radial inner portion 12. The radial outer portion 11 and the radial inner portion 12 are spaced apart in the radial direction of the axial stator 1, and a coil slot 13 is formed between the two, and a coil 5 is provided in the coil slot 13.

[0065] The thrust plate ventilation hole comprises a first thrust plate air inlet hole 01 extending from one axial end face 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 face 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 then 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 face of the thrust plate 3 is opposite to the position of the coil slot 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;

[0066] The axial stator 1 further includes an axial outer portion 14, and 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.

[0067] A bearing stator ventilation hole 03 is provided on the axial outer portion 14 of the axial stator 1. The bearing stator ventilation hole 03 penetrates from one axial end surface of the axial outer portion 14 to the other axial end surface. The bearing stator ventilation hole 03 can be connected with the first thrust plate air inlet hole 01.

[0068] The thrust plate ventilation holes and thrust plate air outlet holes are provided on the thrust plate. The thrust plate ventilation holes include a first thrust plate air inlet hole extending from one axial end face of the thrust plate toward the interior of the thrust plate, and a second thrust plate air inlet hole extending from the other axial end face of the thrust plate toward the interior of the thrust plate. The thrust plate ventilation holes can realize active air suction and heat exchange through high rotation speed, increase the gas flow rate introduced, accelerate the cooling of the axial magnetic bearing, actively cool the thrust plate 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 suspension bearing, and the first thrust plate air inlet hole is not opposite to the magnetic pole position of the axial stator one, so that the end face of the thrust plate can be directly opposite to the axial stator one. No holes are punched at the magnetic pole position, so that the cooling air cannot directly reach the magnetic pole gap position, which can effectively avoid the cooling gas and the opening from affecting the magnetic furnace structure, thereby avoiding insufficient axial supporting force of the magnetic suspension, and achieving improved heat dissipation and cooling of the magnetic suspension bearing while avoiding affecting the magnetic suspension magnetic circuit, ensuring sufficient magnetic suspension supporting force, and effectively reducing the influence of gas force on the axial force; the present invention also provides a bearing stator ventilation hole on the axial outer side, and the bearing stator ventilation hole can be connected to the first thrust plate air inlet hole, so as to provide an air flow channel, further accelerate the gas flow in the axial stator coil slot cavity, and realize effective autonomous heat dissipation of the axial coil and the thrust plate.

[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 portion 12, forming a first gas flow path 06.

[0071] Inside the coil slot 13, there is also a third gap between the axial outer portion 14 and the coil 5, forming a bearing stator ventilation slot 04;

[0072] The bearing stator ventilation hole 03 is connected to the bearing stator ventilation groove 04, and is further connected to the first thrust plate air inlet hole 01 through the first gas flow path 06.

[0073] The present invention is capable of forming a plurality of gas flow paths flowing from both sides toward the thrust plate ventilation holes of the middle thrust plate by providing a bearing stator ventilation hole on the axial outer portion, a stator ventilation slot and a gas flow path in the axial stator coil slot, thereby further accelerating the gas flow in the axial stator coil slot cavity and realizing effective autonomous heat dissipation of the axial coil and the thrust plate.

[0074] In some embodiments,

[0075] It also includes a cover plate 4, the cover plate 4 is located between the axial stator 1 and the thrust plate 3, and an axial end surface of the cover plate 4 is connected to the radial outer side portion 11 of the axial stator 1, and the other axial end surface of the cover plate 4 is opposite to the thrust plate 3;

[0076] The magnetic pole position of the axial stator 1 includes a portion of the cover plate 4 opposite to the thrust plate 3, and a portion of the radial inner portion 12 opposite to the thrust plate 3, a first gap 05 is provided between the cover plate 4 and the radial inner portion 12, the first thrust plate air inlet hole 01 is opposite to the first gap 05 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 plate air inlet hole 01.

[0077] The present invention also preferably arranges the thrust plate ventilation hole between the axial upper and lower magnetic poles directly opposite the coil, and the aperture size is ≤ the radial spacing between the axial upper and lower magnetic poles of the stator, so that the first thrust plate air inlet hole can further effectively avoid the magnetic pole position, further avoid affecting the magnetic circuit, and the thrust plate ventilation hole is connected with the ventilation paths at both ends without obstruction, and the air flow resistance at both ends of the thrust plate can be small and the fluidity is 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 plate air inlet hole are connected in sequence to form an air flow channel.

[0078] In some embodiments,

[0079] In any radial cross section of the thrust disk 3, the cross-sectional area of ​​the magnetic path flow position of the axial stator 1 = the radial cross-sectional area of ​​the thrust disk and the corresponding part of the 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 axial stator 1.

[0080] The present invention further sets the relationship in any radial cross-section of the thrust plate: the cross-sectional area of ​​the magnetic circuit flow position of the axial stator 1 = the radial cross-sectional area of ​​the thrust plate and the corresponding part of the axial stator 1 - the cross-sectional area of ​​the thrust plate ventilation hole - the cross-sectional area of ​​the thrust plate air outlet hole ≥ the cross-sectional area of ​​the magnetic pole position of the axial stator 1, so that other magnetic circuit parts on the thrust plate that are different from the magnetic pole position will not experience magnetic field saturation before the magnetic pole position, thereby ensuring the formation of a normal magnetic flux circuit and ensuring the continuous and effective provision of magnetic suspension supporting force.

[0081] In some embodiments,

[0082] 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, and 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, and 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.

[0083] The present invention also sets the first thrust plate air inlet hole so that the extension direction from one axial end face to the other axial end face is toward the second rotation direction, and the second rotation direction is opposite to the first rotation direction (the rotation direction of the thrust plate). When the rotor drives the thrust plate to rotate at high speed, negative pressure is generated to suck out the hot air at one end and discharge it to the outside, thereby increasing the gas flow rate, realizing active ventilation and heat exchange of the thrust plate itself, accelerating gas flow, saving energy consumption, improving heat dissipation performance and improving energy efficiency.

[0084] In order to facilitate negative pressure air intake, the air inlet direction of the inner ring is opposite to the rotation direction, the air inlet is 90° in the circumferential direction to the rotation direction, and the air outlet is 90° in the radial direction to the rotation direction. There is no requirement for the hole shape. For the convenience of machining and processing, a circular hole, a rectangular circular hole or an elliptical hole is preferred.

[0085] In some embodiments,

[0086] There are multiple 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 of the first thrust plate air inlet holes 01 from one axial end face to the other axial end face is toward the second rotation direction, which is opposite to the first rotation direction of the thrust plate 3.

[0087] The present invention proposes a magnetic levitation rotating machine (preferably a blower) with active and efficient heat dissipation. The thrust plate adopts a Y-shaped inclined hole solution to realize its own active air suction heat exchange through high speed, increase the gas flow rate introduced, accelerate the cooling of the axial magnetic bearing, and cooperate with the overall active pure air cooling of the magnetic levitation rotating machine. The coaxial impeller cooling at the other end of the main impeller or the rotor rotation negative pressure cooling or the main impeller leakage cooling is used to change the previous external passive heat dissipation into internal active heat dissipation, improve the heat dissipation efficiency and reduce the heat dissipation cost. This magnetic levitation rotating machine cooling solution can effectively ventilate and dissipate heat for motor stators, motor rotors, magnetic bearings, etc., and can also better dissipate heat for axial magnetic bearings, thereby improving the stability of the magnetic levitation system.

[0088] In some embodiments,

[0089] The axial stator 2 includes a radial outer portion 21 and a radial inner portion 22, the radial outer portion 21 and the radial inner portion 22 are spaced apart in the radial direction of the axial stator 2, and a coil slot 23 is formed therebetween, a coil 2 5' is arranged in the coil slot 23, 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 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;

[0090] The second axial stator 2 further includes a second axial outer portion 24, and 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.

[0091] A bearing stator ventilation hole 203' is provided on the axial outer portion 24 of the axial stator 2. The bearing stator ventilation hole 203' penetrates from one axial end surface of the axial outer portion 24 to the other axial end surface. The bearing stator ventilation hole 203' can be connected with the second thrust plate air inlet hole 02.

[0092] The present invention further arranges the second thrust plate air inlet hole at a position which is not opposite to the magnetic pole position of the axial stator 2, so that the thrust plate end face is not punched at the magnetic pole position facing the axial stator 2, so that the cooling air cannot directly reach the magnetic pole gap position of the axial stator 2, which can further effectively avoid the cooling gas and the opening from affecting the magnetic furnace structure, further avoid the insufficient axial supporting force of the magnetic suspension, further achieve the improvement of the heat dissipation cooling of the magnetic suspension bearing, and avoid the influence on the magnetic suspension magnetic circuit, further improve the magnetic suspension supporting force, and effectively reduce the influence of the gas force on the axial force; the present invention also provides a bearing stator ventilation hole 1 on the axial outer side, and the bearing stator ventilation hole 1 can be connected with the first thrust plate air inlet hole, so as to provide an air flow channel, further accelerate the gas flow in the axial stator coil slot cavity, and realize the effective autonomous heat dissipation of the axial coil and the thrust plate.

[0093] In some embodiments,

[0094] Inside the coil slot 23, there is a fifth gap between the radial inner side of the coil 2 5' and the radial inner portion 22, forming a second gas flow path 08.

[0095] Inside the second coil slot 23, there is also a sixth gap between the second axial outer portion 24 and the second coil 5', forming a bearing stator ventilation slot 204';

[0096] 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 .

[0097] The present invention is provided with two bearing stator ventilation holes on the second axial outer portion, and two stator ventilation slots and a gas flow path in the axial stator coil slot, so that multiple gas flow paths can be formed that flow from both sides toward the thrust plate ventilation holes of the middle thrust plate, which can further accelerate the gas flow in the axial stator coil slot cavity and realize effective autonomous heat dissipation of the axial coil and the thrust plate.

[0098] In some embodiments,

[0099] It also includes a cover plate 4', the cover plate 4' is located between the axial stator 2 and the thrust plate 3, and one axial end surface of the cover plate 4' is connected to the radial outer side 21 of the axial stator 2, and the other axial end surface of the cover plate 4' is opposite to the thrust plate 3;

[0100] The magnetic pole position of the axial stator 2 includes the portion of the cover plate 2 4' opposite to the thrust plate 3, and the portion of the radial inner portion 22 opposite to the thrust plate 3, a fourth gap 07 is provided between the cover plate 2 4' and the radial inner portion 22, the second thrust plate air inlet hole 02 is opposite to the fourth gap 07 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.

[0101] The present invention also preferably arranges the second thrust plate air inlet hole between the upper and lower magnetic poles of the axial stator 2, directly opposite to the coil, and the aperture size is ≤ the radial spacing between the upper and lower magnetic poles of the axial stator, so that the second thrust plate air inlet hole can further effectively avoid the magnetic pole position, further avoid affecting the magnetic circuit, and the thrust plate ventilation hole is connected with the ventilation paths at both ends without obstruction, and the air flow resistance at both ends of the thrust plate is small and the fluidity is good; and the bearing stator ventilation hole 2, the bearing stator ventilation groove 2, the second gas flow path, the second gap and the second thrust plate air inlet hole are connected in sequence to form an air flow flow channel.

[0102] In some embodiments,

[0103] In each radial cross section of the thrust plate 3, the cross-sectional area of ​​the magnetic path flow position of the axial stator 2 = the radial cross-sectional area of ​​the thrust plate and the corresponding part of the axial stator 2 - the cross-sectional area of ​​the thrust plate ventilation hole - the cross-sectional area of ​​the thrust plate air outlet hole 09 ≥ the cross-sectional area of ​​the magnetic pole position of the axial stator 2.

[0104] The present invention further provides a thrust plate ventilation hole between the upper and lower magnetic poles of the axial stator 2, directly opposite to the coil, so that the aperture size of the thrust plate ventilation hole is ≤ the radial spacing between the upper and lower magnetic poles of the axial stator 2, so that the thrust plate ventilation hole can further effectively avoid the magnetic pole position of the axial stator 2, further avoiding the influence on the magnetic circuit, and the thrust plate ventilation hole is connected to the ventilation paths at both ends without obstruction, and the airflow resistance at both ends of the thrust plate is small and the fluidity is good.

[0105] In some embodiments,

[0106] 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, and 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 the third rotation direction, and 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 the fourth rotation direction, and the fourth rotation direction is opposite to the third rotation direction.

[0107] The present invention also sets the second thrust plate air inlet hole so that the extension direction from the other axial end face to the one axial end face is toward the fourth rotation direction, and the fourth rotation direction is opposite to the third rotation direction (the rotation direction of the thrust plate), so that the rotor can drive the thrust plate to rotate at a high speed to generate negative pressure to suck out the hot air at one end and discharge it to the outside, thereby increasing the gas flow rate, realizing active ventilation and heat exchange of the thrust plate itself, accelerating gas flow, saving energy consumption, improving heat dissipation performance and improving energy efficiency;

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

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

[0110] In some embodiments,

[0111] There are multiple second thrust plate air inlet holes 02, and the multiple second thrust plate air inlet holes 02 are arranged at intervals along the circumferential direction of the thrust plate 3, and the 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 the fourth rotation direction, which is opposite to the third rotation direction of the thrust plate 3.

[0112] In some embodiments,

[0113] 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. There are multiple groups of air outlet units, and the multiple groups of air outlet units are arranged at intervals along the circumferential direction of the thrust plate 3 .

[0114] The present invention can increase the air flow area and flow rate in the circumferential direction by disposing a plurality of air outlet units, thereby further improving the cooling and heat dissipation effect on the magnetic suspension bearing.

[0115] In some embodiments,

[0116] The thrust plate 3 has a minimum axial width of N for the magnetic circuit flow area when the magnetic saturation is met, and the axial aperture of the thrust plate air outlet 09 = the axial thickness of the thrust plate 3 - N. The thrust plate of the present invention preferably has a minimum axial width of N for the magnetic circuit flow area when the magnetic saturation is met, and the axial aperture of the air outlet = the thickness of the thrust plate - N, which can effectively ensure the maximum heat dissipation channel without affecting the conduction of the axial magnetic circuit.

[0117] In some embodiments,

[0118] The outer periphery of the axial stator 1 and the axial stator 2 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.

[0119] The present invention has a stator outer ring hole arranged on the outermost shell, which is opposite to the thrust plate air outlet and can guide the gas discharged from the thrust plate air outlet hole, so that the gas entering from the first and second thrust plate air inlet holes on both sides respectively is discharged from the stator outer ring hole after cooling the coil, rotor and other structures of the magnetic suspension bearing, thereby ensuring the smoothness of gas flow and improving the cooling effect.

[0120] The axial magnetic bearing of the present invention preferably adopts active ventilation cooling. The thrust plate is installed on the rotor. Oblique holes are drilled on both sides of the thrust plate facing the ventilation groove of the axial bearing near the inner ring to the middle, and then holes are drilled upward to the outer ring surface of the thrust plate. Several Y-shaped inclined holes are opened circumferentially in the thrust plate facing the ventilation groove of the axial bearing. The air intake direction is opposite to the rotation direction of the rotor. When the thrust plate is driven by the rotor to rotate at a high speed, negative pressure is generated to suck out hot air at one end and discharge it to the outside, thereby increasing the gas flow rate introduced, realizing active ventilation and heat exchange of the thrust plate itself, 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 axial bearing cavity area, thereby realizing effective autonomous heat dissipation of the axial magnetic bearing.

[0121] According to the principle of axial magnetic bearing, the relative position between the thrust plate and the axial magnetic pole is the output position, that is, the thrust plate end face facing the magnetic pole position cannot be punched 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 the gas reaction force on the axial force. Therefore, the magnetic bearing requires that the cooling hole cannot face the magnetic pole gap position. According to the requirements of axial magnetic circuit flow, in order to ensure that the magnetic field saturation does not occur in other positions before the magnetic pole position, in the radial circumferential direction, the cross-sectional area of ​​the magnetic circuit flow position ≥ the cross-sectional area of ​​the magnetic pole position. The air inlet is located between the axial upper and lower magnetic poles directly opposite to the coil, and the aperture size is ≤ the radial spacing of the upper and lower magnetic poles of the axial stator. In each radial circumferential direction, the cross-sectional area of ​​the magnetic circuit flow position = the radial circumferential cross-sectional area of ​​the thrust plate - the cross-sectional area in the same direction of the hole position ≥ the cross-sectional area of ​​the magnetic pole position. It is preferred that the thrust plate meets the minimum axial width of the magnetic circuit flow area when magnetic saturation is N, and the axial aperture of the air outlet = the thickness of the thrust plate - N, so as to ensure the maximum heat dissipation channel without affecting the conduction of the axial magnetic circuit. To facilitate negative pressure air intake, the direction of the air inlet from the inner ring is opposite to the direction of rotation, the air inlet is >90° from the direction of rotation in the circumferential direction, and the air outlet is ≥90° from the direction of rotation in the radial direction. There is no requirement for the hole shape. For the convenience of machining and processing, circular holes, rectangular holes or elliptical holes are preferred.

[0122] The entire system uses an active pure air-cooled cooling system. The cold air is driven by the coaxial impeller at the other end of the main impeller or the rotor rotates to centrifugally inlet or the main impeller leaks inlet. No additional cooling drive motor is required. The cooling cold air flow 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 cooling system has a simple structure and the heat dissipation process is efficient and reliable.

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

[0124] 1. The present invention sets a Y-shaped inclined hole on the thrust plate for high-heat generating components, uses negative pressure to absorb heat through the Y-shaped inclined hole flow channel, and drills inclined holes on both sides between the two magnetic poles of the thrust plate to merge in the middle, and then drills inclined holes upward to the outer ring surface of the thrust plate. The through hole on the inner ring surface of the axial stator cooperates with the Y-shaped hole air inlet of the thrust plate, which can actively cool and accelerate the heat dissipation of itself, increase the cooling flow rate and do not affect the axial magnetic circuit;

[0125] 2. The present invention 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 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 invention also provides a magnetic suspension rotating machine (preferably a rotating machine such as a motor, a blower, a ventilator or a compressor), which includes the aforementioned magnetic suspension bearing.

[0127] Figure 1 The figure shows the internal axial bearing cooling path of the magnetic levitation rotating machine (preferably a blower) of the present invention. The first thrust plate air inlet hole 01 (oblique hole), the second thrust plate air inlet hole 02 (oblique hole), and the thrust plate air outlet hole 09 (oblique hole) form a thrust plate Y-shaped oblique hole. The thrust plate Y-shaped hole air inlet is located between the axial inner and outer magnetic poles facing the coil, corresponding to the wire slot ventilation position. Ventilation slots and ventilation holes are provided on the axial stator, and the ventilation holes are connected to the ventilation slots. The ventilation slots (the first and second gas flow paths) are radial, annular, or spiral. This cooling path is: cooling gas passes through the bearing stator ventilation hole 1 03 (bearing stator ventilation hole 2 03') → bearing stator ventilation slot 1 04 (bearing stator ventilation slot 2 04') → first gas flow path 06 (second gas flow path 08) → first gap 05 (fourth gap 07), and is collected from the first thrust plate air inlet hole 01 and the second thrust plate air inlet hole 02 on both sides of the thrust plate to the thrust plate air outlet hole 09 for discharge, effectively dissipating heat for the axial stator and axial winding. During operation, the air intake direction of the first and thrust plate air inlet inclined holes is opposite to the rotation direction of the rotor, and the negative pressure is used to suck the gas in the ventilation groove into the thrust plate inclined hole and then discharge it for heat dissipation. This cooling path achieves an effective autonomous heat dissipation effect. In order to make the thrust plate intake negative pressure air, the intake direction must always be opposite to the rotor rotation direction. Therefore, the rotation direction of the thrust plate inclined hole is related to the thrust plate intake direction and the rotor rotation direction. If the rotation direction of the intake rotor at the left end of the thrust plate is clockwise when viewed from the right end, the thrust plate is a right-handed inclined hole. If the rotation direction of the intake rotor at the left end of the thrust plate is counterclockwise when viewed from the right end, it is a left-handed inclined hole. Similarly, if the directions do not match, the heat dissipation effect will be weakened and the heat dissipation efficiency will be reduced.

[0128] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention. These improvements and variations should also be regarded as the protection scope of the present invention.

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 any one of claims 1 to 13, 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 any one of claims 1 to 14, 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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