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; in the axial direction, the first thrust disc air inlet hole is located at the position opposite to the gap between the radial inner periphery of the first radial inner side part and the rotor, and 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 includes a first thrust plate air inlet hole extending from one axial end surface 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 surface 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. In the axial direction, the first thrust plate air inlet hole is located at a position opposite to the gap between the radial inner periphery of the radial inner portion 1 and the rotor, and the first thrust plate air inlet hole is not opposite to the magnetic pole position of the axial stator 1.

[0009] In some embodiments,

[0010] It also includes a pressure plate 1, which is located between the axial stator 1 and the thrust plate, and an axial end face of the pressure plate 1 is connected to the radial outer side 1 of the axial stator 1, and the other axial end face of the pressure plate 1 is opposite to the thrust plate; a pressure plate 1 ventilation hole is provided on the pressure plate 1 from its axial end face to the other axial end face, and the pressure plate 1 ventilation hole is opposite to the position of the coil slot 1 in the axial direction, and the pressure plate 1 ventilation hole is not opposite to the magnetic pole position of the axial stator 1.

[0011] In some embodiments,

[0012] The magnetic pole position of the axial stator 1 includes a portion of the pressure plate 1 opposite to the thrust plate, and a portion of the radial inner portion 1 opposite to the thrust plate. The radial outer circumferential wall of the thrust plate is located at a position opposite to the radial inner circumferential wall of the pressure plate 1 and the radial outer circumferential wall of the pressure plate 1. The ventilation hole of the pressure plate 1 is located at the outer periphery of the portion of the pressure plate 1 opposite to the thrust plate. The outer periphery of the thrust plate is formed as an airflow circulation space, and the airflow circulation space is connected to the ventilation hole of the pressure plate 1.

[0013] In some embodiments,

[0014] A first gap is provided between the coil 1 and the radial outer portion 1, the ventilation hole of the pressure plate 1 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 ventilation hole of the pressure plate 1.

[0015] In some embodiments,

[0016] The axial stator 1 also includes an axial outer portion 1, which is arranged in the axial direction of the magnetic bearing relative to the coil 1 and away from the thrust plate. Inside the coil slot 1, there is also a second gap between the axial outer portion 1 and the coil 1, forming a bearing stator ventilation slot 1;

[0017] A bearing stator ventilation hole is provided on the axial outer side portion 1 of the axial stator 1. The bearing stator ventilation hole 1 penetrates from one axial end surface of the axial outer side portion 1 to the other axial end surface so as to be connected with the bearing stator ventilation groove 1, and further connected to the ventilation hole of the pressure plate 1 through the first gap, and then connected to the air flow space.

[0018] In some embodiments,

[0019] The axial stator 2 includes a radial outer portion 2 and a radial inner portion 2, the radial outer portion 2 and the radial inner portion 2 are spaced apart in the radial direction of the axial stator 2, and a coil slot 2 is formed therebetween, and a coil 2 is arranged in the coil slot 2; in the axial direction, the second thrust plate air inlet hole is located at a position opposite to the gap between the radial inner periphery of the radial inner portion 2 and the rotor, and the second thrust plate air inlet hole is not opposite to the magnetic pole position of the axial stator 2.

[0020] In some embodiments,

[0021] It also includes a pressure plate 2, which is located between the axial stator 2 and the thrust plate, and an axial end face of the pressure plate 2 is connected to the radial outer portion 2 of the axial stator 2, and the other axial end face of the pressure plate 2 is opposite to the thrust plate; a pressure plate 2 ventilation hole is provided on the pressure plate 2 from its axial end face to the other axial end face, and the pressure plate 2 ventilation hole is opposite to the position of the coil slot 2 in the axial direction, and the pressure plate 2 ventilation hole is not opposite to the magnetic pole position of the axial stator 2.

[0022] In some embodiments,

[0023] The magnetic pole position of the axial stator 2 includes the portion of the pressure plate 2 opposite to the thrust plate, and the portion of the radial inner portion 2 opposite to the thrust plate. The radial outer circumferential wall of the thrust plate is located at a position opposite to the radial inner circumferential wall of the pressure plate 2 and the radial outer circumferential wall of the pressure plate 2. The ventilation hole of the pressure plate 2 is located at the outer periphery of the portion of the pressure plate 2 opposite to the thrust plate. The outer periphery of the thrust plate is formed as an airflow circulation space, and the airflow circulation space is connected to the ventilation hole of the pressure plate 2.

[0024] In some embodiments,

[0025] A third gap is provided between the coil 2 and the radial outer portion 2, the ventilation hole of the pressure plate 2 is opposite to the third gap in the axial direction, and the radial dimension of the third gap is greater than or equal to the radial dimension of the ventilation hole of the pressure plate 2.

[0026] In some embodiments,

[0027] The second axial stator further includes a second axial outer portion, which is arranged in the axial direction of the magnetic bearing relative to the second coil and away from the thrust plate, and inside the second coil slot, there is also a fourth gap between the second axial outer portion and the second coil, forming a second bearing stator ventilation slot;

[0028] 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 extends from one axial end surface of the axial outer portion 2 to the other axial end surface to be connected with the bearing stator ventilation groove 2, and further connected to the pressure plate 2 ventilation hole through the third gap, and further connected to the air flow circulation space.

[0029] In some embodiments,

[0030] The aperture of the air inlet hole of the first thrust plate is smaller than the radial distance between the first radial inner portion and the rotor, and the aperture of the air inlet hole of the second thrust plate is smaller than the radial distance between the second radial inner portion and the rotor.

[0031] In some embodiments,

[0032] 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.

[0033] In some embodiments,

[0034] 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.

[0035] In some embodiments,

[0036] 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.

[0037] In some embodiments,

[0038] 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.

[0039] In some embodiments,

[0040] 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.

[0041] In some embodiments,

[0042] 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.

[0043] In some embodiments,

[0044] The outer periphery of the thrust plate is formed as an airflow circulation space;

[0045] The axial stator 1 also includes an axial outer portion 1, on which a bearing stator ventilation hole 1 is provided, the bearing stator ventilation hole 1 is located radially outside the radial outer portion 1, and the bearing stator ventilation hole 1 penetrates from an axial end surface of the axial outer portion 1 to the other axial end surface to communicate with the airflow circulation space;

[0046] The axial stator 2 includes a radial outer portion 2, a radial inner portion 2 and an axial outer portion 2. The axial outer portion 2 is provided with a bearing stator ventilation hole 2. The bearing stator ventilation hole 2 is located radially outside the radial outer portion 2. The bearing stator ventilation hole 2 penetrates from one axial end face of the axial outer portion 2 to the other axial end face to communicate with the airflow circulation space.

[0047] In some embodiments,

[0048] 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.

[0049] The present invention also provides a magnetic suspension rotating machine, which includes the above-mentioned magnetic suspension bearing.

[0050] The magnetic suspension bearing and magnetic suspension rotating machine provided by the present invention have the following beneficial effects:

[0051] 1. The present invention provides a thrust plate ventilation hole and a thrust plate air outlet hole on the thrust plate, wherein 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 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 can realize its own 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 air cannot directly When it reaches the position of the magnetic pole gap, it 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 first (second) thrust plate air inlet hole at the gap between the axial lower magnetic pole and the rotor, and the aperture size is ≤ the radial spacing between the axial lower magnetic pole of the stator and the rotor, 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.

[0052] 2. The present invention can introduce cooling air into the stator through the ventilation holes of the pressure plate 1 opened on the pressure plate 1 to cool the stator, thereby improving the cooling and heat dissipation effect of the magnetic suspension bearing, and the ventilation holes of the pressure plate 1 are not opposite to the magnetic pole position of the axial stator 1, so that the pressure plate 1 does not have holes at the position directly opposite to the magnetic pole, so that the cooling air cannot directly reach the magnetic pole gap position, and can effectively avoid the cooling gas and the openings from affecting the magnetic furnace structure, thereby avoiding insufficient axial support force of the magnetic suspension, achieving improved heat dissipation cooling of the magnetic suspension bearing while avoiding affecting the magnetic suspension magnetic circuit, ensuring sufficient magnetic suspension support force, and effectively reducing the influence of the gas force on the axial force; the present invention also preferably arranges the ventilation holes of the pressure plate 1 at a position opposite to the outer periphery of the thrust plate, and the aperture size of the ventilation holes of the pressure plate 1 is ≤ the radial spacing between the coil and the stator core, which can further enable the ventilation holes of the pressure plate 1 to further effectively avoid the magnetic pole position, further avoid affecting the magnetic circuit, and the ventilation holes of the thrust plate are connected to the ventilation paths at both ends without obstruction, and can also make the airflow resistance at both ends of the thrust plate small and the fluidity good.

[0053] 3. The present invention further ensures that the aperture of the air inlet hole of the first thrust plate is less than the radial spacing between the radial inner part 1 and the rotor, and the aperture of the air inlet hole of the second thrust plate is less than the radial spacing between the radial inner part 2 and the rotor, 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 support force; the present invention also ensures that the air inlet hole of the first thrust plate is arranged to extend from one axial end face to the other axial end face toward the second rotation direction, and the second rotation direction is opposite to the first rotation direction (the rotation direction of the thrust plate), so that the rotor can drive the thrust plate to rotate at high speed to generate negative pressure 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, accelerating gas flow, saving energy consumption, improving heat dissipation performance and improving energy efficiency; at the same time, in conjunction with the bearing stator ventilation holes and ventilation grooves (multiple gas flow paths) in the axial stator coil slots, the gas flow in the axial stator coil slot cavity can be further accelerated to achieve effective autonomous heat dissipation of the axial coil and the thrust plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 is a longitudinal sectional stereoscopic view of the magnetic suspension bearing of the present invention;

[0055] Figure 2 yes Figure 1 A three-dimensional internal structure diagram of the thrust plate structure;

[0056] Figure 3 It is a three-dimensional structural diagram of the axial stator core of the magnetic suspension bearing of the present invention;

[0057] Figure 4 It is a longitudinal sectional perspective view of a magnetic bearing according to an alternative embodiment of the present invention.

[0058] The reference numerals are as follows:

[0059] 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. Pressure plate 1; 4', Pressure plate 2; 5. Coil 1; 5', Coil 2; 6. Housing; 7. Rotor;

[0060] 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. Pressure plate one ventilation hole; 05', pressure plate two ventilation hole; 06. First gap; 06', third gap; 07. Air flow space; 09. Thrust plate air outlet; 10. Stator outer ring hole. DETAILED DESCRIPTION

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] like Figure 1-3 As shown, the present invention provides a magnetic bearing, which includes:

[0068] 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.

[0069] The thrust plate ventilation hole includes 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. In the axial direction, the first thrust plate air inlet hole 01 is located at a position opposite to the gap between the radial inner periphery of the radial inner portion 12 and the rotor 7, and the first thrust plate air inlet hole 01 is not opposite to the magnetic pole position of the axial stator 1.

[0070] 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 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 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 air cannot directly When the magnetic pole gap position is reached, the cooling gas and the opening can be effectively avoided 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 first (second) thrust plate air inlet hole in the gap between the axial lower magnetic pole and the rotor, and the aperture size is ≤ the radial spacing between the axial lower magnetic pole of the stator and the rotor, 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.

[0071] In some embodiments,

[0072] It also includes a pressure plate 4, which is located between the axial stator 1 and the thrust plate 3, and an axial end face of the pressure plate 4 is connected to the radial outer side 11 of the axial stator 1, and the other axial end face of the pressure plate 4 is opposite to the thrust plate 3; a pressure plate ventilation hole 05 is provided on the pressure plate 4 from its axial end face to the other axial end face, and the pressure plate ventilation hole 05 is opposite to the position of the coil slot 13 in the axial direction, and the pressure plate ventilation hole 05 is not opposite to the magnetic pole position of the axial stator 1.

[0073] The present invention can introduce cooling air into the stator through the ventilation holes of the pressure plate one opened on the pressure plate one to cool the stator, thereby improving the cooling and heat dissipation effect of the magnetic suspension bearing, and the ventilation holes of the pressure plate one are not opposite to the magnetic pole position of the axial stator one, so that the pressure plate one does not have holes at the position directly opposite to the magnetic pole, so that the cooling air cannot directly reach the magnetic pole gap position, and can effectively avoid the cooling gas and the openings from affecting the magnetic furnace structure, thereby avoiding insufficient axial support force of the magnetic suspension, achieving improved heat dissipation 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 ventilation holes of the pressure plate one at a position opposite to the outer periphery of the thrust plate, and the aperture size of the ventilation holes of the pressure plate one is ≤ the radial spacing between the coil and the stator core, which can further enable the ventilation holes of the pressure plate one to further effectively avoid the magnetic pole position, further avoid affecting the magnetic circuit, and the ventilation holes of the thrust plate are connected to the ventilation paths at both ends without obstruction, and can also make the airflow resistance at both ends of the thrust plate small and the fluidity good.

[0074] In some embodiments,

[0075] The magnetic pole position of the axial stator 1 includes the portion of the pressure plate 4 opposite to the thrust plate 3, and the portion of the radial inner portion 12 opposite to the thrust plate 3. The radial outer circumferential wall of the thrust plate 3 is located at a position opposite to the radial inner circumferential wall of the pressure plate 4 and the radial outer circumferential wall of the pressure plate 4. The pressure plate ventilation hole 05 is located on the outer periphery of the portion of the pressure plate 4 opposite to the thrust plate 3. The outer periphery of the thrust plate 3 is formed as an airflow circulation space 07, and the airflow circulation space 07 is connected to the pressure plate ventilation hole 05.

[0076] The present invention also preferably arranges a ventilation hole of the pressure plate at a position opposite to the outer periphery of the thrust plate, which can further enable the ventilation hole of the pressure plate to further effectively avoid the magnetic pole position and further avoid affecting the magnetic circuit. The ventilation hole of the thrust plate 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.

[0077] In some embodiments,

[0078] A first gap 06 is provided between the coil 1 5 and the radial outer portion 11 , the pressure plate ventilation hole 05 is opposite to the first gap 06 in the axial direction, and a radial dimension of the first gap 06 is greater than or equal to a radial dimension of the pressure plate ventilation hole 05 .

[0079] The present invention also preferably has a ventilation hole diameter of the pressure plate ≤ the radial spacing between the coil and the stator core, which can further enable the ventilation hole of the pressure plate to further effectively avoid the magnetic pole position and further avoid affecting the magnetic circuit. The ventilation hole of the thrust plate 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.

[0080] In some embodiments,

[0081] The axial stator 1 also includes an axial outer portion 14, which is arranged in the axial direction of the magnetic bearing relative to the coil 5 and away from the thrust plate 3. Inside the coil slot 13, there is also a second gap between the axial outer portion 14 and the coil 5, forming a bearing stator ventilation slot 04;

[0082] A bearing stator ventilation hole 03 is provided on the axial outer side 14 of the axial stator 1. The bearing stator ventilation hole 03 penetrates from one axial end surface of the axial outer side 14 to the other axial end surface to be connected with the bearing stator ventilation groove 04, and further connected to the pressure plate ventilation hole 05 through the first gap 06, and further connected to the air flow space 07.

[0083] The present invention can further accelerate the gas flow in the axial stator coil slot cavity by setting bearing stator ventilation holes and ventilation slots (multiple gas flow paths) in the axial stator coil slot, thereby achieving effective autonomous heat dissipation of the axial coil and the thrust plate.

[0084] In some embodiments,

[0085] 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 5' is arranged in the coil slot 23. In the axial direction, the second thrust plate air inlet hole 02 is located at a position opposite to the gap between the radial inner periphery of the radial inner portion 22 and the rotor 7, and the second thrust plate air inlet hole 02 is not opposite to the magnetic pole position of the axial stator 2.

[0086] 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 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 second thrust plate air inlet hole is not opposite to the magnetic pole position of the axial stator two, so that the end face of the thrust plate is not punched at the magnetic pole position facing the axial stator two, so that the cooling air cannot directly When the magnetic pole gap position is reached, the cooling gas and the opening can be effectively avoided 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 first (second) thrust plate air inlet hole in the gap between the axial lower magnetic pole and the rotor, and the aperture size is ≤ the radial spacing between the axial lower magnetic pole of the stator and the rotor, 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.

[0087] It also includes a pressure plate 4', which is located between the axial stator 2 and the thrust plate 3, and one axial end face of the pressure plate 4' is connected to the radial outer side 21 of the axial stator 2, and the other axial end face of the pressure plate 4' is opposite to the thrust plate 3; a pressure plate 2 ventilation hole 05' is provided on the pressure plate 4' from one axial end face to the other axial end face, and the pressure plate 2 ventilation hole 05' is opposite to the position of the coil slot 2 23 in the axial direction, and the pressure plate 2 ventilation hole 05' is not opposite to the magnetic pole position of the axial stator 2.

[0088] The present invention further introduces cooling air into the stator to cool the stator through the ventilation holes of the second pressure plate opened on the second pressure plate, thereby improving the cooling and heat dissipation effect of the magnetic suspension bearing, and the ventilation holes of the second pressure plate are not opposite to the magnetic pole position of the axial stator two, so that the second pressure plate does not have a hole at the position facing the magnetic pole, so that the cooling air cannot directly reach the magnetic pole gap position, and 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 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.

[0089] In some embodiments,

[0090] The magnetic pole position of the axial stator 2 includes the portion of the pressure plate 2 4' opposite to the thrust plate 3, and the portion of the radial inner portion 22 opposite to the thrust plate 3. The radial outer peripheral wall of the thrust plate 3 is located at a position opposite to the radial inner peripheral wall of the pressure plate 2 4' and the radial outer peripheral wall of the pressure plate 2 4'. The pressure plate 2 ventilation hole 05' is located at the outer periphery of the portion of the pressure plate 2 4' opposite to the thrust plate 3. The outer periphery of the thrust plate 3 is formed as an airflow circulation space 07, and the airflow circulation space 07 is connected to the pressure plate 2 ventilation hole 05'.

[0091] The present invention also preferably arranges the two ventilation holes of the pressure plate at a position opposite to the outer periphery of the thrust plate, which can further enable the two ventilation holes of the pressure plate to further effectively avoid the magnetic pole position and further avoid affecting the magnetic circuit. The ventilation holes of the thrust plate are 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.

[0092] In some embodiments,

[0093] There is a third gap 06' between the coil 2 5' and the radial outer portion 21, the second ventilation hole 05' of the pressure plate is opposite to the third gap 06' in the axial direction, and the radial dimension of the third gap 06' is greater than or equal to the radial dimension of the second ventilation hole 05' of the pressure plate.

[0094] The present invention also preferably has the aperture size of the second ventilation hole of the pressure plate ≤ the radial spacing between the coil and the stator core, which can further enable the second ventilation hole of the pressure plate to further effectively avoid the magnetic pole position and further avoid affecting the magnetic circuit. The ventilation holes of the thrust plate are 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.

[0095] In some embodiments,

[0096] The axial stator 2 also includes an axial outer portion 24, which is arranged in the axial direction of the magnetic bearing relative to the coil 2 5' and away from the thrust plate 3. Inside the coil slot 23, there is also a fourth gap between the axial outer portion 24 and the coil 2 5', forming a bearing stator ventilation slot 204';

[0097] A bearing stator ventilation hole 203' is provided on the axial outer side 24 of the axial stator 2. The bearing stator ventilation hole 203' passes through one axial end surface of the axial outer side 24 to the other axial end surface to be connected with the bearing stator ventilation groove 204', and further connected to the pressure plate 2 ventilation hole 05' through the third gap 06', and further connected to the air flow space 07.

[0098] The present invention can further accelerate the gas flow in the coil slot cavity of the axial stator 2 by setting bearing stator ventilation holes and ventilation slots (multiple gas flow paths) in the coil slot of the axial stator 2, thereby achieving effective autonomous heat dissipation of the axial coil and the thrust plate.

[0099] In some embodiments,

[0100] The aperture of the first thrust plate air inlet hole 01 is smaller than the radial distance between the radial inner part 12 and the rotor 7 , and the aperture of the second thrust plate air inlet hole 02 is smaller than the radial distance between the radial inner part 22 and the rotor 7 .

[0101] The present invention further ensures that the aperture of the first thrust plate air inlet hole is less than the radial spacing between the radial inner portion 1 and the rotor, and the aperture of the second thrust plate air inlet hole is less than the radial spacing between the radial inner portion 2 and the rotor, 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 the continuous and effective provision of magnetic suspension supporting force.

[0102] In some embodiments,

[0103] 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.

[0104] 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.

[0105] 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.

[0106] In some embodiments,

[0107] 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.

[0108] 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.

[0109] In some embodiments,

[0110] 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.

[0111] 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;

[0112] 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.

[0113] 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.

[0114] In some embodiments,

[0115] 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.

[0116] In some embodiments,

[0117] 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 .

[0118] 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.

[0119] In some embodiments,

[0120] 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.

[0121] like Figure 4 , alternative embodiment, in some embodiments,

[0122] The outer periphery of the thrust plate 3 is formed as an airflow circulation space 07;

[0123] The axial stator 1 also includes an axial outer portion 14, and a bearing stator ventilation hole 03 is provided on the axial outer portion 14. The bearing stator ventilation hole 03 is located radially outside the radial outer portion 11, and the bearing stator ventilation hole 03 penetrates from one axial end surface of the axial outer portion 14 to the other axial end surface to communicate with the airflow circulation space 07;

[0124] The axial stator 2 includes a radial outer portion 21, a radial inner portion 22 and an axial outer portion 24. The axial outer portion 24 is provided with a bearing stator ventilation hole 203'. The bearing stator ventilation hole 203' is located radially outside the radial outer portion 21. The bearing stator ventilation hole 203' passes through from one axial end face of the axial outer portion 24 to the other axial end face to communicate with the air flow space 07.

[0125] This is a preferred structural form of an alternative embodiment of the present invention, through the bearing stator ventilation holes one and two respectively opened on the axial outer sides one and two, which are respectively connected to the air flow circulation space on the periphery of the thrust plate, it is possible to form two airflows with the ventilation holes on the thrust plate, respectively cool the periphery and coil part of the bearing stator, effectively improving the cooling and heat dissipation efficiency, and the bearing stator ventilation holes one and two at this position will not affect the magnetic pole position, which can improve the cooling and heat dissipation efficiency while ensuring the normal magnetic circuit of the magnetic levitation bearing and the magnetic support force of the magnetic bearing.

[0126] In some embodiments,

[0127] 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.

[0128] 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.

[0129] 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.

[0130] 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.

[0131] 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.

[0132] The beneficial effects of the present invention are as follows:

[0133] 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;

[0134] 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.

[0135] 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.

[0136] 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 three inclined holes of the first thrust plate air inlet hole 01 (inclined hole), the second thrust plate air inlet hole 02 (inclined hole), and the thrust plate air outlet hole 09 (inclined hole) form a thrust plate Y-shaped inclined hole. The thrust plate Y-shaped hole air inlet is located between the axial inner magnetic pole and the rotor. Ventilation slots and ventilation holes are provided on the axial stator. The ventilation holes are connected to the ventilation slots. The stator ventilation slots are radial, annular, or spiral. This cooling path is: the first path: during operation, the air intake direction of the first thrust plate air inlet inclined hole and the second thrust plate air inlet inclined hole is opposite to the rotation direction of the rotor, and the air outlet direction of the thrust plate air outlet inclined hole is opposite to the rotation direction of the rotor. The cooling gas in the first air inlet inclined hole and the second air inlet inclined hole is sucked out from the air outlet inclined hole by negative pressure. The gas flow rate is increased to accelerate the heat dissipation of the thrust plate; the second path: the cooling gas flows quickly through the ventilation slots through the ventilation holes on the axial stator, effectively dissipating the heat of the axial stator and the axial winding; the two paths are ventilated at the same time to accelerate the gas discharge and heat dissipation, and cooperate with the cooling path of the overall solution to achieve effective heat dissipation. In order to use negative pressure to exhaust the cooling gas from the Y-shaped inclined hole, the air inlet direction of the first air inlet inclined hole and the second air inlet inclined hole and the air outlet direction of the air outlet inclined hole must always be opposite to the rotation direction of the thrust plate. If the directions are the same, the heat dissipation effect is weakened and the heat dissipation efficiency is reduced.

[0137] 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 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 to one end of the second thrust plate air inlet hole (02) located inside the thrust plate (3); after being connected, the two are connected to the outer periphery of the thrust plate (3) through the thrust plate air outlet hole (09); in the axial direction, the first thrust plate air inlet hole (01) is located at a position opposite to the gap between the radial inner periphery of the radial inner side portion (12) and the rotor (7), and the first thrust plate air inlet hole (01) is not opposite to the magnetic pole position of the axial stator (1).

2. The magnetic bearing according to claim 1, characterized in that: It also includes a pressure plate (4), which is located between the axial stator (1) and the thrust plate (3), and an axial end face of the pressure plate (4) is connected to the radial outer side (11) of the axial stator (1), and the other axial end face of the pressure plate (4) is opposite to the thrust plate (3); a pressure plate ventilation hole (05) is provided on the pressure plate (4) from its axial end face to the other axial end face, and the pressure plate ventilation hole (05) is opposite to the position of the coil slot (13) in the axial direction, and the pressure plate ventilation hole (05) is not opposite to the magnetic pole position of the axial stator (1).

3. The magnetic bearing according to claim 2, characterized in that: The magnetic pole position of the axial stator (1) includes a portion of the pressure plate (4) opposite to the thrust plate (3) and a portion of the radial inner portion (12) opposite to the thrust plate (3); the radial outer peripheral wall of the thrust plate (3) is located at a position relative to the radial inner peripheral wall of the pressure plate (4) and the radial outer peripheral wall of the pressure plate (4); the pressure plate ventilation hole (05) is located on the periphery of the portion of the pressure plate (4) opposite to the thrust plate (3); the outer periphery of the thrust plate (3) is formed as an air flow space (07); and the air flow space (07) is connected to the pressure plate ventilation hole (05).

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

5. The magnetic bearing according to claim 4, characterized in that: The axial stator (1) further comprises an axial outer portion (14), which is arranged in the axial direction of the magnetic bearing relative to the coil (5) and away from the thrust plate (3), and inside the coil slot (13), there is also a second gap between the axial outer portion (14) and the coil (5), forming a bearing stator ventilation slot (04); A bearing stator ventilation hole (03) is provided on the axial outer side portion (14) of the axial stator (1). The bearing stator ventilation hole (03) extends from one axial end surface of the axial outer side portion (14) to the other axial end surface to communicate with the bearing stator ventilation groove (04), and further communicates with the pressure plate ventilation hole (05) through the first gap (06), and further connects to the air flow space (07).

6. 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, and a coil 2 (5') is arranged in the coil slot 2 (23); in the axial direction, the second thrust plate air inlet hole (02) is located at a position opposite to the gap between the radial inner periphery of the radial inner portion 2 (22) and the rotor (7), and the second thrust plate air inlet hole (02) is not opposite to the magnetic pole position of the axial stator 2 (2).

7. The magnetic bearing according to claim 6, characterized in that: It also includes a pressure plate 2 (4'), which is located between the axial stator 2 (2) and the thrust plate (3), and one axial end face of the pressure plate 2 (4') is connected to the radial outer side 2 (21) of the axial stator 2 (2), and the other axial end face of the pressure plate 2 (4') is opposite to the thrust plate (3); a pressure plate 2 ventilation hole (05') is provided on the pressure plate 2 (4') from its one axial end face to the other axial end face, and the pressure plate 2 ventilation hole (05') is opposite to the position of the coil slot 2 (23) in the axial direction, and the pressure plate 2 ventilation hole (05') is not opposite to the magnetic pole position of the axial stator 2 (2).

8. The magnetic bearing according to claim 7, characterized in that: The magnetic pole position of the second axial stator (2) includes the portion of the second pressure plate (4') opposite to the thrust plate (3), and the portion of the second radial inner portion (22) opposite to the thrust plate (3), The radial outer peripheral wall of the thrust plate (3) is located at a position opposite to the radial inner peripheral wall of the pressure plate 2 (4') and the radial outer peripheral wall of the pressure plate 2 (4'); the pressure plate 2 ventilation hole (05') is located at the outer periphery of the portion of the pressure plate 2 (4') opposite to the thrust plate (3); the outer periphery of the thrust plate (3) is formed as an air flow circulation space (07); and the air flow circulation space (07) is connected to the pressure plate 2 ventilation hole (05').

9. The magnetic bearing according to claim 8, characterized in that: A third gap (06') is provided between the coil 2 (5') and the radial outer portion 2 (21); the ventilation hole (05') of the pressure plate 2 is opposite to the third gap (06') in the axial direction, and the radial dimension of the third gap (06') is greater than or equal to the radial dimension of the ventilation hole (05') of the pressure plate 2.

10. The magnetic bearing according to claim 9, characterized in that: The axial stator 2 (2) further comprises an axial outer portion 2 (24), the axial outer portion 2 (24) being arranged in the axial direction of the magnetic bearing relative to the coil 2 (5') and away from the thrust plate (3), and inside the coil slot 2 (23), there is also a fourth gap between the axial outer portion 2 (24) and the coil 2 (5'), forming a bearing stator ventilation slot 2 (04'); A bearing stator ventilation hole 2 (03') is provided on the axial outer side 2 (24) of the axial stator 2 (2). The bearing stator ventilation hole 2 (03') extends from one axial end surface of the axial outer side 2 (24) to the other axial end surface to communicate with the bearing stator ventilation groove 2 (04'), and further communicates with the pressure plate 2 ventilation hole (05') through the third gap (06'), and further connects to the air flow space (07).

11. The magnetic bearing according to claim 6, characterized in that: The aperture of the first thrust plate air inlet hole (01) is smaller than the radial distance between the radial inner part one (12) and the rotor (7), and the aperture of the second thrust plate air inlet hole (02) is smaller than the radial distance between the radial inner part two (22) and the rotor (7).

12. 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.

13. The magnetic bearing according to claim 12, 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).

14. 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.

15. The magnetic bearing according to claim 14, 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).

16. The magnetic bearing according to claim 15, 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).

17. 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.

18. The magnetic bearing according to any one of claims 1 to 17, characterized in that: The outer periphery of the thrust plate (3) is formed into an airflow circulation space (07); The axial stator (1) further comprises an axial outer portion (14), the axial outer portion (14) being provided with a bearing stator ventilation hole (03), the bearing stator ventilation hole (03) being located radially outside the radial outer portion (11), the bearing stator ventilation hole (03) penetrating from one axial end surface of the axial outer portion (14) to the other axial end surface to communicate with the airflow circulation space (07); The axial stator 2 (2) comprises a radial outer portion 2 (21), a radial inner portion 2 (22) and an axial outer portion 2 (24); the axial outer portion 2 (24) is provided with a bearing stator ventilation hole 2 (03'); the bearing stator ventilation hole 2 (03') is located radially outside the radial outer portion 2 (21); the bearing stator ventilation hole 2 (03') penetrates from one axial end surface of the axial outer portion 2 (24) to the other axial end surface to communicate with the air flow circulation space (07).

19. The magnetic bearing according to any one of claims 1 to 18, 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.

20. A magnetically suspended rotating machine, characterized in that: The invention comprises the magnetic bearing according to any one of claims 1 to 19.

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