Magnetic suspension bearing and magnetic suspension rotating machine

Abstract

The utility model provides a magnetic suspension bearing and magnetic suspension rotating machinery, the magnetic suspension bearing includes: axial stator no. 1, axial stator no. 2 and thrust disc, in the axial direction of magnetic suspension bearing, the thrust disc is arranged between axial stator no. Thrust disc ventilation holes are formed in the thrust disc from one axial end face to the other axial end face in a penetrating mode, the first axial stator comprises a first radial outer side part and a first radial inner side part, the first radial outer side part and the first radial inner side part are arranged in the radial direction of the first axial stator in a spaced mode, a first coil groove is formed between the first radial outer side part and the first radial inner side part, and a first coil is arranged in the first coil groove; 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 can be improved, meanwhile, influence on a magnetic suspension magnetic circuit can be avoided, and enough magnetic suspension supporting force is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of magnetic levitation bearings, and particularly relates to a magnetic levitation bearing and a magnetic levitation rotating machine. Background Art

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

[0003] The axial magnetic bearing realizes the axial movement of the rotating shaft. An axial force component, namely a thrust disk, is essential on the rotating shaft. The axial magnetic bearing and the thrust disk are made of a pure iron solid structure, with large self-loss, general thermal conductivity and narrow space. If not effectively cooled, they will generate serious heat. Usually, in order to avoid too high temperature rise of the axial magnetic bearing, forced air cooling is often applied externally to dissipate heat from the magnetic bearing. The cooling air is input from the outside and passes through the gap between the bearing stator and the thrust disk to dissipate heat from the axial magnetic bearing, but the heat dissipation efficiency is not high.

[0004] Due to technical problems such as poor cooling and heat dissipation of the magnetic levitation bearing inside the rotating machine in the prior art, the utility model researches and designs a magnetic levitation bearing and a magnetic levitation rotating machine. Summary of the Utility Model

[0005] Therefore, the technical problem to be solved by the utility model is to overcome the defect of poor cooling and heat dissipation of the magnetic levitation bearing inside the rotating machine in the prior art, so as to provide a magnetic levitation bearing and a magnetic levitation rotating machine.

[0006] To solve the above problems, the utility model provides a magnetic levitation bearing, which comprises:

[0007] An axial stator one, an axial stator two and a thrust disk. In the axial direction of the magnetic levitation bearing, the thrust disk is arranged between the axial stator one and the axial stator two. Thrust disk ventilation holes are arranged through the thrust disk from one axial end face to the other axial end face. The axial stator one includes a radial outer part one and a radial inner part one. The radial outer part one and the radial inner part one are arranged at intervals in the radial direction of the axial stator one, and a coil slot one is formed between them. A coil one is arranged in the coil slot one;

[0008] The thrust disc ventilation holes include a first thrust disc air inlet hole extending from one axial end face of the thrust disc towards the inside of the thrust disc, and a second thrust disc air inlet hole extending from the other axial end face of the thrust disc towards the inside of the thrust disc. One end of the first thrust disc air inlet hole located inside the thrust disc communicates with one end of the second thrust disc air inlet hole located inside the thrust disc. After communication, it is then communicated to the outer circumference of the thrust disc through a thrust disc air outlet hole. In the axial direction, the first thrust disc air inlet hole is located at a position opposite to the gap between the radial inner circumference of the radial inner part one and the rotor, and the first thrust disc air inlet hole is not opposite to the magnetic pole position of the axial stator one.

[0009] In some embodiments,

[0010] It further includes a first pressing plate located between the axial stator one and the thrust disc. One axial end face of the first pressing plate is in contact with the radial outer part one of the axial stator one, and the other axial end face of the first pressing plate faces the thrust disc. A first pressing plate ventilation hole is provided through the first pressing plate from its one axial end face to the other axial end face. The first pressing plate ventilation hole is opposite to the position of the coil slot one in the axial direction, and the first pressing plate ventilation hole is not opposite to the magnetic pole position of the axial stator one.

[0011] In some embodiments,

[0012] The magnetic pole position of the axial stator one includes the part where the first pressing plate faces the thrust disc and the part where the radial inner part one faces the thrust disc. The radial outer peripheral wall of the thrust disc is located at a position opposite to the position between the radial inner peripheral wall and the radial outer peripheral wall of the first pressing plate. The first pressing plate ventilation hole is located on the outer periphery of the part where the first pressing plate faces the thrust disc. The outer periphery of the thrust disc forms an air flow passage space, and the air flow passage space communicates with the first pressing plate ventilation hole.

[0013] In some embodiments,

[0014] There is a first gap between the coil one and the radial outer part one. The first pressing plate ventilation hole is opposite to the first gap in the axial direction, and the dimension of the first gap in the radial direction is greater than or equal to the radial dimension of the first pressing plate ventilation hole.

[0015] In some embodiments,

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

[0017] On the outer axial portion one of the axial stator one, there is a bearing stator ventilation hole one, and the bearing stator ventilation hole one penetrates from one axial end face of the outer axial portion one to the other axial end face to communicate with the bearing stator ventilation groove one, and further communicates with the pressing plate one ventilation hole through the first gap, and then communicates with the air flow passage space.

[0018] In some embodiments,

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

[0020] In some embodiments,

[0021] It further includes a pressing plate two, the pressing plate two is located between the axial stator two and the thrust plate, and one axial end face of the pressing plate two is in contact with the radially outer portion two of the axial stator two, and the other axial end face of the pressing plate two is opposite to the thrust plate; a pressing plate two ventilation hole is penetrated through the pressing plate two from one axial end face to the other axial end face, the pressing plate two ventilation hole is opposite to the position of the coil groove two in the axial direction, and the pressing plate two ventilation hole is not opposite to the magnetic pole position of the axial stator two.

[0022] In some embodiments,

[0023] The magnetic pole position of the axial stator two includes the portion where the pressing plate two is opposite to the thrust plate and the portion where the radially inner portion two is opposite to the thrust plate. The radially outer peripheral wall of the thrust plate is located at a position opposite to the position between the radially inner peripheral wall and the radially outer peripheral wall of the pressing plate two. The pressing plate two ventilation hole is located on the outer periphery of the portion where the pressing plate two is opposite to the thrust plate. The outer periphery of the thrust plate forms an air flow passage space, and the air flow passage space communicates with the pressing plate two ventilation hole.

[0024] In some embodiments,

[0025] There is a third gap between the coil two and the radially outer portion two. The pressing plate two ventilation hole is opposite to the third gap in the axial direction, and the dimension of the third gap in the radial direction is greater than or equal to the radial dimension of the pressing plate two ventilation hole.

[0026] In some embodiments,

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

[0028] A bearing stator ventilation hole two is provided on the axial outer portion two of the axial stator two. The bearing stator ventilation hole two penetrates from one axial end face of the axial outer portion two to the other axial end face to communicate with the bearing stator ventilation slot two, and further communicates with the pressing plate two ventilation hole through the third gap, and then communicates with the air flow circulation space.

[0029] In some embodiments,

[0030] The aperture of the first thrust disk air inlet hole < the radial distance between the radial inner portion one and the rotor, and the aperture of the second thrust disk air inlet hole < the radial distance between the radial inner portion two and the rotor.

[0031] In some embodiments,

[0032] Along the axial direction of the thrust disk, the first thrust disk air inlet hole is an inclined hole structure whose extending direction is not parallel to the axis of the thrust disk. From the observation direction from one axial end face of the thrust disk to the other axial end face, the rotation direction of the thrust disk is towards the first rotation direction, and the extending direction of the first thrust disk air inlet hole from one axial end face to the other axial end face is towards the second rotation direction, and the second rotation direction is opposite to the first rotation direction.

[0033] In some embodiments,

[0034] The first thrust disk air inlet holes are multiple, and the multiple first thrust disk air inlet holes are arranged at intervals along the circumferential direction of the thrust disk, and the extending direction of each first thrust disk air inlet hole from one axial end face to the other axial end face is towards the second rotation direction, and is opposite to the first rotation direction of the thrust disk.

[0035] In some embodiments,

[0036] Along the axial direction of the thrust disk, the second thrust disk air inlet hole is an inclined hole structure whose extending direction is not parallel to the axis of the thrust disk. From the observation direction from the other axial end face of the thrust disk to the one axial end face, the rotation direction of the thrust disk is towards the third rotation direction, and the extending direction of the second thrust disk air inlet hole from the other axial end face to the one axial end face is towards the fourth rotation direction, and the fourth rotation direction is opposite to the third rotation direction.

[0037] In some embodiments,

[0038] The second thrust disk air inlet holes are multiple, and the multiple second thrust disk air inlet holes are arranged at intervals along the circumferential direction of the thrust disk, and the extending direction of each second thrust disk air inlet hole from the axial other end face to the axial one end face is all towards the fourth rotation direction, and is opposite to the third rotation direction of the thrust disk.

[0039] In some embodiments,

[0040] The first thrust disk air inlet hole, the thrust disk air outlet hole and the second thrust disk air inlet hole correspond to each other one by one to form a set of air outlet units, and there are multiple sets of the air outlet units, and the multiple sets of air outlet units are arranged at intervals along the circumferential direction of the thrust disk.

[0041] In some embodiments,

[0042] When the thrust disk satisfies magnetic saturation, the axial width of the magnetic circuit flow-through area is at least N, and the axial aperture of the thrust disk air outlet hole = the axial thickness of the thrust disk - N.

[0043] In some embodiments,

[0044] The outer periphery of the thrust disk forms an air flow passage space;

[0045] The axial stator one further includes an axial outer part one, and a bearing stator ventilation hole one is arranged on the axial outer part one, and the bearing stator ventilation hole one is located radially outside the radial outer part one, and the bearing stator ventilation hole one penetrates from the axial one end face of the axial outer part one to the axial other end face to communicate with the air flow passage space;

[0046] The axial stator two includes a radial outer part two, a radial inner part two and an axial outer part two, and a bearing stator ventilation hole two is arranged on the axial outer part two, and the bearing stator ventilation hole two is located radially outside the radial outer part two, and the bearing stator ventilation hole two penetrates from the axial one end face of the axial outer part two to the axial other end face to communicate with the air flow passage space.

[0047] In some embodiments,

[0048] The outer peripheries of the axial stator one and the axial stator two further have a housing, and a stator outer ring hole is further arranged at a position of the housing opposite to the thrust disk air outlet hole of the thrust disk, and can be used to connect with the thrust disk air outlet hole and exhaust outwards.

[0049] The present utility model further provides a magnetic levitation rotating machine, which includes the aforementioned magnetic levitation bearing.

[0050] The magnetic levitation bearing and the magnetic levitation rotating machine provided by the utility model have the following beneficial effects:

[0051] 1. Through the thrust disk ventilation holes and the thrust disk air outlet holes formed in the thrust disk of the utility model, the thrust disk ventilation holes include a first thrust disk air inlet hole extending from one axial end surface of the thrust disk towards the inside of the thrust disk and a second thrust disk air inlet hole extending from the other axial end surface of the thrust disk towards the inside of the thrust disk. It can achieve self-acting 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 disk itself and increase the cooling flow rate to accelerate the heat dissipation of the axial coil, improve the cooling and heat dissipation effect of the magnetic levitation bearing, and make the first thrust disk air inlet hole not opposite to the magnetic pole position of the axial stator one, which can make the thrust disk end surface not have holes at the magnetic pole position directly facing the axial stator one, so that the cooling air cannot directly reach the magnetic pole gap position, effectively avoid the influence of the cooling gas and the holes on the magnetic furnace structure, thus avoid insufficient magnetic levitation axial supporting force, realize the improvement of heat dissipation and cooling of the magnetic levitation bearing while avoiding the influence on the magnetic levitation magnetic circuit, ensure sufficient magnetic levitation supporting force, and effectively reduce the influence of gas acting force on the axial force; The utility model also preferably sets the first (second) thrust disk air inlet hole at the gap between the lower axial magnetic pole and the rotor, and the aperture size ≤ the radial distance between the lower magnetic pole of the axial stator and the rotor, which can make the thrust disk ventilation hole further effectively avoid the magnetic pole position, further avoid the influence on the magnetic circuit, and the thrust disk ventilation hole is connected with the ventilation paths at both ends without obstruction, and can also make the air flow resistance at both ends of the thrust disk small and the fluidity good.

[0052] 2. Through the pressing plate one ventilation hole formed in the pressing plate one of the utility model, it can introduce cooling air into the stator to cool the stator, improve the cooling and heat dissipation effect of the magnetic levitation bearing, and make the pressing plate one ventilation hole not opposite to the magnetic pole position of the axial stator one, which can make the pressing plate one not have holes at the magnetic pole position directly facing, so that the cooling air cannot directly reach the magnetic pole gap position, effectively avoid the influence of the cooling gas and the holes on the magnetic furnace structure, thus avoid insufficient magnetic levitation axial supporting force, realize the improvement of heat dissipation and cooling of the magnetic levitation bearing while avoiding the influence on the magnetic levitation magnetic circuit, ensure sufficient magnetic levitation supporting force, and effectively reduce the influence of gas acting force on the axial force; The utility model also preferably sets the pressing plate one ventilation hole at a position opposite to the outer circumference of the thrust disk, and the aperture size of the pressing plate one ventilation hole ≤ the radial distance between the coil and the stator core, which can further make the pressing plate one ventilation hole further effectively avoid the magnetic pole position, further avoid the influence on the magnetic circuit, and the thrust disk ventilation hole is connected with the ventilation paths at both ends without obstruction, and can also make the air flow resistance at both ends of the thrust disk small and the fluidity good.

[0053] 3. The present utility model further ensures that the magnetic field saturation does not occur in other magnetic circuit parts on the thrust disc different from the pole positions prior to the pole positions by making the aperture of the air inlet holes of the first thrust disc < the radial distance between the first radial inner part and the rotor, and the aperture of the air inlet holes of the second thrust disc < the radial distance between the second radial inner part and the rotor, so as to ensure the formation of a normal magnetic flux circuit and the continuous and effective provision of magnetic levitation supporting force; the present utility model also makes the extension direction of the air inlet holes of the first thrust disc from one axial end face to the other axial end face towards the second rotation direction, and the second rotation direction is opposite to the first rotation direction (the rotation direction of the thrust disc), so that when the rotor drives the thrust disc to rotate at a high speed, negative pressure can be generated to suck out the hot air at one end and discharge it to the outside, increasing the gas flow rate, realizing the active ventilation and heat exchange of the thrust disc itself, accelerating the gas flow, saving energy consumption, improving the heat dissipation performance and also improving the energy efficiency; at the same time, in cooperation with the bearing stator ventilation holes and ventilation grooves (multiple gas flow paths) in the axial stator coil slots, the gas flow in the cavities of the axial stator coil slots can be further accelerated, realizing the effective independent heat dissipation of the axial coils and the thrust disc. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 is a longitudinal sectional perspective view of the magnetic levitation bearing of the present utility model;

[0055] Figure 2 is Figure 1 the three-dimensional internal structure diagram of the thrust disc structure in

[0056] Figure 3 is a three-dimensional structure diagram of the axial stator core of the magnetic levitation bearing of the present utility model;

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

[0058] The reference numerals are shown as:

[0059] 1. Axial stator one; 11. First radial outer part; 12. First radial inner part; 13. First coil slot; 14. First axial outer part; 2. Axial stator two; 21. Second radial outer part; 22. Second radial inner part; 23. Second coil slot; 24. Second axial outer part; 3. Thrust disc; 4. First pressing plate; 4'. Second pressing plate; 5. First coil; 5'. Second coil; 6. Housing; 7. Rotor;

[0060] 01. First thrust disc air inlet hole; 02. Second thrust disc air inlet hole; 03. Bearing stator ventilation hole 1; 03'. Bearing stator ventilation hole 2; 04. Bearing stator ventilation groove 1; 04'. Bearing stator ventilation groove 2; 05. Press plate 1 ventilation hole; 05'. Press plate 2 ventilation hole; 06. First gap; 06'. Third gap; 07. Air flow passage space; 09. Thrust disc air outlet hole; 10. Stator outer ring hole. Detailed implementation manner

[0061] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way limits the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0062] It should be noted that the terms used herein are only for describing the specific implementation manners and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of the features, steps, operations, devices, components, and / or combinations thereof.

[0063] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps described in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and devices should be regarded as part of the authorization specification. In all the examples shown and discussed here, any specific value should be interpreted as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that: similar reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further discussed in the subsequent drawings.

[0064] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom", etc. is usually based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description. Without contrary explanation, these orientation words do not indicate and imply that the device or component referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the protection scope of the present utility model; the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0065] For the convenience of description, spatial relative terms can be used here, such as "above...", "over...", "on the upper surface of...", "upper...", etc., to describe the spatial positional relationship between a device or feature shown in the figure and other devices or features. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation described in the figure for the device. For example, if the device in the drawing is inverted, the device described as "above other devices or structures" or "over other devices or structures" will then be positioned "below other devices or structures" or "under other devices or structures". Thus, the exemplary term "above..." can include both the orientations of "above..." and "below...". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the corresponding explanations are made for the spatial relative descriptions used here.

[0066] In addition, it should be noted that the use of words such as "first", "second", etc. to limit the components is only for the convenience of distinguishing the corresponding components. Without additional declaration, the above words have no special meaning. Therefore, it should not be construed as a limitation on the protection scope of the present utility model.

[0067] As Figures 1-3 shown, the present utility model provides a magnetic levitation bearing, which includes:

[0068] Axial stator one 1, axial stator two 2 and thrust disk 3. In the axial direction of the magnetic levitation bearing, the thrust disk 3 is arranged between the axial stator one 1 and the axial stator two 2. Thrust disk ventilation holes penetrate through the thrust disk 3 from one axial end face to the other axial end face. The axial stator one 1 includes a radially outer part one 11 and a radially inner part one 12. The radially outer part one 11 and the radially inner part one 12 are arranged at intervals in the radial direction of the axial stator one 1, and a coil slot one 13 is formed between the two. A coil one 5 is arranged in the coil slot one 13;

[0069] The thrust disk ventilation holes include a first thrust disk air inlet hole 01 extending from one axial end surface of the thrust disk 3 towards the inside of the thrust disk 3, and a second thrust disk air inlet hole 02 extending from the other axial end surface of the thrust disk 3 towards the inside of the thrust disk 3. One end of the first thrust disk air inlet hole 01 located inside the thrust disk 3 is communicated with one end of the second thrust disk air inlet hole 02 located inside the thrust disk 3. After being communicated, it is then communicated to the outer circumference of the thrust disk 3 through a thrust disk air outlet hole 09. In the axial direction, the first thrust disk air inlet hole 01 is located at a position opposite to the gap between the radial inner circumference of the radial inner part 12 and the rotor 7, and the first thrust disk air inlet hole 01 is not opposite to the magnetic pole position of the axial stator 1.

[0070] By providing the thrust disk ventilation holes and the thrust disk air outlet holes on the thrust disk in the present utility model, the thrust disk ventilation holes include a first thrust disk air inlet hole extending from one axial end surface of the thrust disk towards the inside of the thrust disk and a second thrust disk air inlet hole extending from the other axial end surface of the thrust disk towards the inside of the thrust disk, which can achieve self - active air intake and heat exchange through high rotational speed, increase the gas flow rate introduced, accelerate the cooling of the axial magnetic bearing, actively cool the thrust disk itself and increase the cooling flow rate to accelerate the heat dissipation of the axial coil, improve the cooling and heat dissipation effect on the magnetic suspension bearing, and make the first thrust disk air inlet hole not opposite to the magnetic pole position of the axial stator 1, which can prevent punching on the thrust disk end face opposite to the magnetic pole position of the axial stator 1, so that the cooling air cannot directly reach the magnetic pole gap position, effectively avoid the influence of the cooling gas and the opening on the magnetic furnace structure, thus avoiding insufficient magnetic suspension axial supporting force, achieving improved heat dissipation and cooling of the magnetic suspension bearing while avoiding the influence on 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 utility model also preferably sets the first (second) thrust disk air inlet hole at the gap between the axial lower magnetic pole and the rotor, and the aperture size ≤ the radial distance between the axial stator lower magnetic pole and the rotor, which can further effectively avoid the magnetic pole position by the thrust disk ventilation holes, further avoid the influence on the magnetic circuit, and the thrust disk ventilation holes are communicated with the ventilation paths at both ends without obstruction, and can also make the air flow resistance at both ends of the thrust disk small and the fluidity good.

[0071] In some embodiments,

[0072] It further includes a first pressing plate 4, which is located between the first axial stator 1 and the thrust disk 3. One axial end face of the first pressing plate 4 is in contact with the first radial outer part 11 of the first axial stator 1, and the other axial end face of the first pressing plate 4 faces the thrust disk 3. A first pressing plate ventilation hole 05 is provided through the first pressing plate 4 from its one axial end face to the other axial end face. The first pressing plate ventilation hole 05 is axially opposite to the position of the first coil slot 13, and the first pressing plate ventilation hole 05 is not opposite to the magnetic pole position of the first axial stator 1.

[0073] By providing the first pressing plate ventilation hole on the first pressing plate, the utility model can introduce cooling air into the stator interior to cool the stator, improving the cooling and heat dissipation effect of the magnetic levitation bearing. And making the first pressing plate ventilation hole not opposite to the magnetic pole position of the first axial stator can prevent the first pressing plate from being perforated at the position directly opposite to the magnetic pole, so that the cooling air cannot directly reach the magnetic pole gap position, effectively avoiding the influence of the cooling gas and the opening on the magnetic furnace structure, thus avoiding insufficient magnetic levitation axial supporting force, achieving improved heat dissipation and cooling of the magnetic levitation bearing while avoiding affecting the magnetic levitation magnetic circuit, ensuring sufficient magnetic levitation supporting force, and effectively reducing the influence of gas force on the axial force. The utility model also preferably sets the first pressing plate ventilation hole at a position opposite to the outer periphery of the thrust disk, and the aperture size of the first pressing plate ventilation hole ≤ the radial distance between the coil and the stator core, which can further effectively avoid the magnetic pole position by the first pressing plate ventilation hole, further avoiding affecting the magnetic circuit, and the thrust disk ventilation hole is connected and unobstructed with the ventilation paths at both ends, and can also make the air flow resistance at both ends of the thrust disk small and the fluidity good.

[0074] In some embodiments,

[0075] The magnetic pole position of the first axial stator 1 includes the part where the first pressing plate 4 faces the thrust disk 3 and the part where the first radial inner part 12 faces the thrust disk 3. The outer peripheral wall of the thrust disk 3 is located at a position opposite to the position between the inner peripheral wall and the outer peripheral wall of the first pressing plate 4. The first pressing plate ventilation hole 05 is located on the outer periphery of the part where the first pressing plate 4 faces the thrust disk 3. The outer periphery of the thrust disk 3 forms an air flow passage space 07, and the air flow passage space 07 is communicated with the first pressing plate ventilation hole 05.

[0076] The utility model also preferably sets the first pressing plate ventilation hole at a position opposite to the outer periphery of the thrust disk, which can further effectively avoid the magnetic pole position by the first pressing plate ventilation hole, further avoiding affecting the magnetic circuit, and the thrust disk ventilation hole is connected and unobstructed with the ventilation paths at both ends, and can also make the air flow resistance at both ends of the thrust disk small and the fluidity good.

[0077] In some embodiments,

[0078] There is a first gap 06 between the first coil 5 and the first radially outer portion 11. The first pressing plate ventilation hole 05 and the first gap 06 are opposite in the axial direction, and the dimension of the first gap 06 in the radial direction is greater than or equal to the radial dimension of the first pressing plate ventilation hole 05.

[0079] The present utility model also preferably has the aperture size of the first pressing plate ventilation hole ≤ the radial distance between the coil and the stator core, which can further effectively avoid the pole position by the first pressing plate ventilation hole, further avoid affecting the magnetic circuit, and the thrust disk ventilation hole is connected to the ventilation paths at both ends without obstruction, and can also make the air flow resistance at both ends of the thrust disk small and the fluidity good.

[0080] In some embodiments,

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

[0082] A first bearing stator ventilation hole 03 is provided on the first axially outer portion 14 of the first axial stator 1. The first bearing stator ventilation hole 03 penetrates from one axial end face of the first axially outer portion 14 to the other axial end face to communicate with the first bearing stator ventilation slot 04, and further communicates with the first pressing plate ventilation hole 05 through the first gap 06, and then communicates with the air flow space 07.

[0083] The present utility model further can further accelerate the gas flow in the cavity of the axial stator coil slot by the bearing stator ventilation holes and ventilation slots (multiple gas flow paths) arranged in the axial stator coil slot, and realize the effective self-cooling of the axial coil and the thrust disk.

[0084] In some embodiments,

[0085] The second axial stator 2 includes a second radially outer portion 21 and a second radially inner portion 22. The second radially outer portion 21 and the second radially inner portion 22 are arranged at intervals in the radial direction of the second axial stator 2, and a second coil slot 23 is formed therebetween. A second coil 5' is arranged in the second coil slot 23. In the axial direction, the second thrust disk air inlet hole 02 is located at a position opposite to the gap between the radially inner circumference of the second radially inner portion 22 and the rotor 7, and the second thrust disk air inlet hole 02 is not opposite to the pole position of the second axial stator 2.

[0086] The utility model can realize self - active air suction and heat exchange through the thrust disc ventilation holes and thrust disc air outlet holes opened on the thrust disc. The thrust disc ventilation holes include a first thrust disc air inlet hole extending from one axial end face of the thrust disc towards the inside of the thrust disc and a second thrust disc air inlet hole extending from the other axial end face of the thrust disc towards the inside of the thrust disc. It can increase the gas flow rate through high - speed rotation, accelerate the cooling of the axial magnetic bearing, actively cool the thrust disc itself and increase the cooling flow rate to accelerate the heat dissipation of the axial coil, improve the cooling and heat dissipation effect of the magnetic levitation bearing, and make the second thrust disc air inlet hole not opposite to the magnetic pole position of the axial stator two. This can prevent the thrust disc end face from being perforated at the position directly opposite to the magnetic pole of the axial stator two, so that the cooling air cannot directly reach the magnetic pole gap position, effectively avoiding the influence of cooling gas and holes on the magnetic furnace structure, thus avoiding insufficient magnetic levitation axial support force, achieving improved heat dissipation and cooling of the magnetic levitation bearing while avoiding affecting the magnetic levitation magnetic circuit, ensuring sufficient magnetic levitation support force, and effectively reducing the influence of gas force on the axial force. The utility model also preferably sets the first (second) thrust disc air inlet hole at the gap between the axial lower magnetic pole and the rotor, and the aperture size ≤ the radial distance between the axial stator lower magnetic pole and the rotor, which can further effectively avoid the magnetic pole position by the thrust disc ventilation hole, further avoid affecting the magnetic circuit, and the thrust disc ventilation hole is connected to the ventilation paths at both ends without obstruction, and can also make the air flow resistance at both ends of the thrust disc small and the fluidity good.

[0087] It further includes a second pressing plate 4'. The second pressing plate 4' is located between the axial stator two 2 and the thrust disc 3. One axial end face of the second pressing plate 4' is connected to the second radial outer part 21 of the axial stator two 2, and the other axial end face of the second pressing plate 4' faces the thrust disc 3. A second pressing plate ventilation hole 05' is penetrated through the second pressing plate 4' from its one axial end face to the other axial end face. The second pressing plate ventilation hole 05' is axially opposite to the position of the coil slot two 23, and the second pressing plate ventilation hole 05' is not opposite to the magnetic pole position of the axial stator two 2.

[0088] The utility model further cools the stator by introducing cooling air into the stator through the second pressing plate ventilation hole opened on the second pressing plate, improves the cooling and heat dissipation effect of the magnetic levitation bearing, and makes the second pressing plate ventilation hole not opposite to the magnetic pole position of the axial stator two. This can prevent the second pressing plate from being perforated at the position directly opposite to the magnetic pole, so that the cooling air cannot directly reach the magnetic pole gap position, effectively avoiding the influence of cooling gas and holes on the magnetic furnace structure, thus avoiding insufficient magnetic levitation axial support force, achieving improved heat dissipation and cooling of the magnetic levitation bearing while avoiding affecting the magnetic levitation magnetic circuit, ensuring sufficient magnetic levitation support force, and effectively reducing the influence of gas force on the axial force.

[0089] In some embodiments,

[0090] The pole positions of the axial stator two 2 include the part of the second pressure plate 4' opposite to the thrust disk 3 and the part of the second radially inner part 22 opposite to the thrust disk 3. The radially outer peripheral wall of the thrust disk 3 is located at a position opposite to the position between the radially inner peripheral wall and the radially outer peripheral wall of the second pressure plate 4'. The second pressure plate ventilation holes 05' are located on the outer periphery of the part of the second pressure plate 4' opposite to the thrust disk 3. The outer periphery of the thrust disk 3 is formed into an air flow passage space 07, and the air flow passage space 07 communicates with the second pressure plate ventilation holes 05'.

[0091] The present utility model also preferably sets the second pressure plate ventilation holes at a position opposite to the outer periphery of the thrust disk, which can further effectively avoid the pole positions by the second pressure plate ventilation holes, further avoid affecting the magnetic circuit, and the thrust disk ventilation holes are connected to the ventilation paths at both ends without obstruction, and can also make the air flow resistance at both ends of the thrust disk small and the fluidity good.

[0092] In some embodiments,

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

[0094] The present utility model also preferably sets the aperture size of the second pressure plate ventilation holes ≤ the radial distance between the coil and the stator core, which can further effectively avoid the pole positions by the second pressure plate ventilation holes, further avoid affecting the magnetic circuit, and the thrust disk ventilation holes are connected to the ventilation paths at both ends without obstruction, and can also make the air flow resistance at both ends of the thrust disk small and the fluidity good.

[0095] In some embodiments,

[0096] The axial stator two 2 further includes an axially outer part two 24. The axially outer part two 24 is arranged away from the thrust disk 3 relative to the second coil 5' in the axial direction of the magnetic suspension bearing. Inside the second coil slot 23, there is also a fourth gap between the axially outer part two 24 and the second coil 5', forming a bearing stator ventilation slot two 04'.

[0097] On the outer axial part 24 of the axial stator 2, there is a bearing stator ventilation hole 03' which penetrates from one axial end face of the outer axial part 24 to the other axial end face to communicate with the bearing stator ventilation groove 04', and further communicates with the pressing plate two ventilation hole 05' through the third gap 06', and then communicates with the air flow space 07.

[0098] The utility model can further accelerate the gas flow in the coil slot cavity of the axial stator 2 and realize the effective independent heat dissipation of the axial coil and the thrust disk by further arranging bearing stator ventilation holes and ventilation grooves (multiple gas flow paths) in the coil slots of the axial stator 2.

[0099] In some embodiments,

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

[0101] The utility model further makes the aperture of the first thrust disk air inlet hole < the radial distance between the inner radial part one and the rotor, and the aperture of the second thrust disk air inlet hole < the radial distance between the inner radial part two and the rotor, so that other magnetic circuit parts on the thrust disk different from the pole positions will not show magnetic field saturation prior to the pole positions, ensuring the formation of a normal magnetic flux circuit and the continuous and effective provision of magnetic levitation support force.

[0102] In some embodiments,

[0103] Along the axial direction of the thrust disk 3, the first thrust disk air inlet hole 01 is an inclined hole structure whose extending direction is not parallel to the axis of the thrust disk 3. From the viewing direction of the axial one end face of the thrust disk 3 towards its axial other end face, the rotating direction of the thrust disk 3 is towards the first rotating direction, and the extending direction of the first thrust disk air inlet hole 01 from the axial one end face to the axial other end face is towards the second rotating direction, and the second rotating direction is opposite to the first rotating direction.

[0104] The utility model also makes the extending direction of the first thrust disk air inlet hole from the axial one end face to the axial other end face towards the second rotating direction, and the second rotating direction is opposite to the first rotating direction (the rotating direction of the thrust disk). When the rotor drives the thrust disk to rotate at a high speed, negative pressure can be generated to suck out the hot air at one end and discharge it to the outside, increasing the gas flow rate, realizing the active ventilation and heat exchange of the thrust disk itself, accelerating the gas flow, saving energy consumption, and improving the heat dissipation performance and energy efficiency at the same time.

[0105] For the present utility model to facilitate negative pressure air intake, the air intake holes are in the direction opposite to the rotation direction from the inner ring air intake port direction, and the air intake holes are >90° from the rotation direction in the circumferential direction, and the air outlet holes are ≥90° from the rotation direction in the radial direction. There is no requirement for the hole shape. For the convenience of machining and technology, circular holes, rectangular round holes or oval holes are preferred.

[0106] In some embodiments,

[0107] There are multiple first thrust disc air intake holes 01, and the multiple first thrust disc air intake holes 01 are arranged at intervals along the circumferential direction of the thrust disc 3, and the extending direction of each first thrust disc air intake hole 01 from one axial end face to the other axial end face is towards the second rotation direction, and is opposite to the first rotation direction of the thrust disc 3.

[0108] The present utility model provides a magnetically levitated rotating machine (preferably a blower) with active and efficient heat dissipation. The thrust disc adopts a Y-shaped inclined hole scheme to achieve its own active air suction and heat exchange through high rotational speed, increase the gas flow rate introduced, accelerate the cooling of the axial magnetic bearing, and at the same time cooperate with the overall active pure air cooling of the magnetically levitated rotating machine, use the coaxial impeller at the other end of the main impeller for cooling, or the negative pressure cooling caused by the rotation of the rotor, or the leakage cooling of the main impeller. It changes from the previous external passive heat dissipation to internal active heat dissipation, improves the heat dissipation efficiency while reducing the heat dissipation cost. This cooling scheme for the magnetically levitated rotating machine can effectively ventilate and dissipate heat for the motor stator, motor rotor, magnetic bearing, etc., and at the same time can better dissipate heat for the axial magnetic bearing, improving the stability of the magnetic levitation system.

[0109] In some embodiments,

[0110] Along the axial direction of the thrust disc 3, the second thrust disc air intake hole 02 is an inclined hole structure whose extending direction is not parallel to the axis of the thrust disc 3. From the observation direction from the other axial end face of the thrust disc 3 to its one axial end face, the rotation direction of the thrust disc 3 is towards the third rotation direction, and the extending direction of the second thrust disc air intake hole 02 from the other axial end face to the one axial end face is towards the fourth rotation direction, and the fourth rotation direction is opposite to the third rotation direction.

[0111] The present utility model also sets the second thrust disc air intake hole so that its extending direction from the other axial end face to the one axial end face is towards the fourth rotation direction, and the fourth rotation direction is opposite to the third rotation direction (the rotation direction of the thrust disc). When the rotor drives the thrust disc to rotate at high speed, negative pressure can be generated to suck out the hot air at one end and discharge it to the outside, increase the gas flow rate introduced, realize the active ventilation and heat exchange of the thrust disc itself, accelerate the gas flow, save energy consumption, and improve the heat dissipation performance and energy efficiency at the same time;

[0112] Along the direction from one axial end face to the other axial end face, the first rotation direction is the third rotation direction, the fourth rotation direction is the same as the second rotation direction, and the first and second thrust disk air inlet holes and the thrust disk air outlet hole together form a Y-shaped inclined hole, with air intake from both sides towards the middle and discharged through the thrust disk air outlet hole.

[0113] For facilitating negative pressure air intake, the direction from the inner ring air inlet is opposite to the rotation direction, the air intake hole is >90° from the rotation direction in the circumferential direction, and the air outlet hole is ≥90° from the rotation direction in the radial direction. There is no requirement for the hole shape, and for facilitating machining and technology, circular holes, rectangular round holes or oval holes are preferred.

[0114] In some embodiments,

[0115] The second thrust disk air inlet holes 02 are multiple, and the multiple second thrust disk air inlet holes 02 are arranged at intervals along the circumferential direction of the thrust disk 3, and the extending direction of each second thrust disk air inlet hole 02 from the other axial end face to one axial end face is towards the fourth rotation direction, and is opposite to the third rotation direction of the thrust disk 3.

[0116] In some embodiments,

[0117] The first thrust disk air inlet hole 01, the thrust disk air outlet hole 09 and the second thrust disk air inlet hole 02 correspond to each other one by one to form a set of air outlet units, and there are multiple sets of the air outlet units, and the multiple sets of air outlet units are arranged at intervals along the circumferential direction of the thrust disk 3.

[0118] Through the arrangement of multiple air outlet units, the utility model can increase the air flow circulation area and circulation flow rate in the circumferential direction, and further improve the cooling and heat dissipation effect on the magnetic suspension bearing.

[0119] In some embodiments,

[0120] The axial width of the magnetic circuit circulation area of the thrust disk 3 when reaching magnetic saturation is at least N, and the axial aperture of the thrust disk air outlet hole 09 = the axial thickness of the thrust disk 3 - N. The utility model preferably has the axial width of the magnetic circuit circulation area of the thrust disk when reaching magnetic saturation at least N, and the axial aperture of the air outlet = the thrust disk thickness - N, which can effectively ensure the maximum heat dissipation channel and does not affect the axial magnetic circuit conduction at the same time.

[0121] Such as Figure 4 , alternative embodiment, in some embodiments,

[0122] The outer periphery of the thrust disk 3 forms an air flow circulation space 07;

[0123] The axial stator 1 further includes an outer axial part 14, on which there is provided a bearing stator ventilation hole 03. The bearing stator ventilation hole 03 is located radially outside the outer radial part 11, and the bearing stator ventilation hole 03 penetrates from one axial end face of the outer axial part 14 to the other axial end face to communicate with the air flow space 07.

[0124] The axial stator 2 includes an outer radial part 21, an inner radial part 22 and an outer axial part 24. On the outer axial part 24, there is provided a bearing stator ventilation hole 03'. The bearing stator ventilation hole 03' is located radially outside the outer radial part 21, and the bearing stator ventilation hole 03' penetrates from one axial end face of the outer axial part 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. By providing the bearing stator ventilation holes 03 and 03' on the outer axial parts 1 and 2 respectively, and connecting them to the air flow space outside the periphery of the thrust disc, two air flows can be formed with the ventilation holes on the thrust disc to cool and dissipate heat from the outer periphery and the coil part of the bearing stator respectively, effectively improving the cooling and heat dissipation efficiency. Moreover, the bearing stator ventilation holes 03 and 03' at this position will not affect the pole positions, and can ensure the normal magnetic circuit of the magnetic suspension bearing while improving the cooling and heat dissipation efficiency, and ensure the magnetic support force of the magnetic bearing.

[0126] In some embodiments,

[0127] The outer peripheries of the axial stator 1 and the axial stator 2 also have a housing 6. At a position of the housing 6 opposite to the thrust disc air outlet hole 09 of the thrust disc 3, there is also provided a stator outer ring hole 10, which can be used to connect to the thrust disc air outlet hole 09 and exhaust outward.

[0128] In the present invention, through the stator outer ring hole provided on the outermost housing, which is opposite to the air outlet of the thrust disc, the gas discharged from the thrust disc air outlet hole can be led out, so that the gas entering from the first and second thrust disc air inlet holes on both sides can be discharged from the stator outer ring hole after cooling the coil, rotor and other structures of the magnetic suspension bearing, ensuring the smoothness of gas flow and improving the cooling effect.

[0129] The axial magnetic bearing of the present utility model preferably adopts active ventilation cooling. The thrust disc is installed on the rotor. Oblique holes are drilled on both sides near the inner ring of the part of the thrust disc facing the ventilation slot of the axial bearing to the middle, and then through holes are drilled upward to the outer ring surface of the thrust disc. Several Y-shaped oblique holes are circumferentially arranged on the part of the thrust disc facing the ventilation slot of the axial bearing. The air inlet direction is opposite to the rotation direction of the rotor. When the rotor drives the thrust disc to rotate at high speed, negative pressure is generated to suck out the hot air at one end and discharge it to the outside, increasing the gas flow rate introduced, realizing the active ventilation and heat exchange of the thrust disc itself. At the same time, in cooperation with the ventilation holes and ventilation slots in the axial stator coil slots, the gas flow in the cavity area of the axial bearing is accelerated, realizing the effective independent heat dissipation of the axial magnetic bearing.

[0130] According to the principle of the axial magnetic levitation bearing, the relative position between the thrust disc and the axial magnetic pole is the force output position, that is, no holes can be drilled at the position where the end face of the thrust disc faces the magnetic pole 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 levitation bearing requires that the cooling holes cannot be directly opposite to the magnetic pole gap position. According to the requirements of the axial magnetic circuit circulation, to ensure that magnetic saturation does not occur at other positions prior to the magnetic pole position, in the radial circumferential direction, the cross-sectional area of the position where the magnetic circuit flows through ≥ the cross-sectional area of the magnetic pole position. The air inlet is located at the position between the upper and lower axial magnetic poles opposite to the coil, and the aperture size ≤ the radial distance between the upper and lower magnetic poles of the axial stator. In each radial circumferential direction, the cross-sectional area of the position where the magnetic circuit flows through = the radial circumferential cross-sectional area of the thrust disc - the cross-sectional area in the same direction as the hole position ≥ the cross-sectional area of the magnetic pole position. It is preferred that the axial width of the magnetic circuit circulation area of the thrust disc when it satisfies magnetic saturation is at least N, and the axial aperture of the air outlet = the thickness of the thrust disc - N, so as to ensure the largest heat dissipation channel and at the same time not affect the conduction of the axial magnetic circuit. For the convenience of negative pressure air intake, the direction of the air inlet from the inner ring is opposite to the rotation direction, the air inlet hole is > 90° to the rotation direction in the circumferential direction, and the air outlet hole is ≥ 90° to the rotation direction in the radial direction. There is no requirement for the hole shape. For the convenience of machining and technology, circular holes, rectangular round holes or oval holes are preferred.

[0131] The entire system dissipates heat using an active pure air-cooled heat dissipation system. The cold air is driven by a coaxial impeller at the other end of the main impeller or enters by rotor rotation centrifugation or leakage of the main impeller. No additional heat dissipation drive motor is required. The flow rate of the heat dissipation cold air is adjusted by the motor speed, and no additional controller is required. The overall internal flow channel layout guides the cold air to each component for targeted heat dissipation. The entire heat dissipation system has a simple structure and an efficient and reliable heat dissipation process.

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

[0133] 1. In the present utility model, a Y-shaped inclined hole is provided in the thrust disk for high-heat-generating components, and negative pressure is used to suck out heat through the flow channel of the Y-shaped inclined hole. Oblique holes are drilled on both sides between the two magnetic poles of the thrust disk and converge to the middle, and then an oblique hole is drilled upward to the outer ring surface of the thrust disk. The inner ring surface of the axial stator is provided with through holes to cooperate with the air inlet of the Y-shaped hole of the thrust disk, which can actively cool and accelerate its own heat dissipation, increase the cooling flow rate without affecting the axial magnetic circuit;

[0134] 2. The present utility model provides an integrated high-efficiency pure air-cooled heat dissipation system. The active pure air-cooled heat dissipation system reduces the heat dissipation cost. Targeted ventilation of the heat-generating components can effectively accelerate cooling and improve reliability, and 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 reliability of the heat dissipation system is high.

[0135] The present utility model also provides a magnetic levitation rotating machinery (preferably a rotating machinery such as a motor, a blower, a ventilator or a compressor, etc.), which includes the aforementioned magnetic levitation bearing.

[0136] Figure 1 The internal axial bearing cooling path of the magnetic levitation rotating machinery (preferably a blower) of the present utility model is shown. The first thrust disk air inlet hole 01 (oblique hole), the second thrust disk air inlet hole 02 (oblique hole), and the thrust disk air outlet hole 09 (oblique hole) form the Y-shaped inclined hole of the thrust disk. The air inlet of the Y-shaped hole of the thrust disk is located between the axial inner magnetic pole and the rotor. Ventilation grooves and ventilation holes are provided on the axial stator, and the ventilation holes communicate with the ventilation grooves. The stator ventilation grooves are in a radial shape, or a circular shape, or a spiral shape, etc. This cooling path is as follows: The first path: During operation, the air inlet directions of the first thrust disk air inlet oblique hole and the second thrust disk air inlet oblique hole are opposite to the rotation direction of the rotor, and the air outlet direction of the thrust disk air outlet oblique hole is opposite to the rotation direction of the rotor. Negative pressure is used to suck out the cooling gas in the first air inlet oblique hole and the second air inlet oblique hole from the air outlet oblique hole. The gas flow rate is increased, and the heat dissipation of the thrust disk is accelerated; The second path: The cooling gas quickly flows through the ventilation holes on the axial stator and through the ventilation grooves, effectively dissipating heat from the axial stator and the axial winding; The two paths ventilate simultaneously to accelerate the gas discharge and heat dissipation, and cooperate with the overall cooling path of the scheme to achieve an effective heat dissipation effect. In order to use negative pressure to discharge the cooling gas from the Y-shaped hole, the air inlet directions of the first air inlet oblique hole and the second air inlet oblique hole and the air outlet direction of the air outlet oblique hole must always be opposite to the rotation direction of the thrust disk. If the directions are the same, the heat dissipation effect will be weakened and the heat dissipation efficiency will be reduced.

[0137] The above are only the preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model. The above is only the preferred implementation manner of the present utility model. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the technical principle of the present utility model, several improvements and variations can still be made, and these improvements and variations should also be regarded as within the protection scope of the present utility model.

Claims

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

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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