Magnetic suspension rotating machine

Abstract

The utility model provides a magnetic suspension rotating machine. The magnetic suspension rotating machine comprises a magnetic suspension bearing, a motor stator and a rotor, 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 in a penetrating mode from one axial end face to the other axial end face of the thrust disc, the first axial stator comprises a first radial outer side portion and a first radial inner side portion, and the first radial outer side portion and the first radial inner side portion are arranged in the radial direction of the first axial stator in a spaced mode. A first coil groove is formed between the first thrust disc air inlet hole and the second thrust disc air inlet hole, a first coil is arranged in the first coil groove, one end, located on one axial end face of the thrust disc, of the first thrust disc air inlet hole is opposite to the first coil groove in the axial direction, and the motor rotor flow channel and the motor stator flow channel can both communicate with the first bearing stator ventilation hole; the first thrust disc air inlet hole is not opposite to the magnetic pole position of the first axial stator. According to the magnetic suspension bearing, heat dissipation and cooling of the magnetic suspension bearing are improved, meanwhile, influence on a magnetic suspension magnetic circuit can be avoided, and enough magnetic suspension supporting force is guaranteed.

Description

Technical Field

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

[0002] At present, the heat dissipation of magnetic levitation rotating machines mainly relies on external cooling equipment, usually including external cooling fans, water cooling systems, heat exchangers, etc. The cost of equipment maintenance is high, the structural 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, but it cannot more effectively achieve the heat dissipation of internal components, especially the heat dissipation of axial magnetic bearings is insufficient, which affects the stable operation of magnetic levitation air compressors.

[0003] The axial magnetic bearing realizes the axial movement of the rotating shaft. An essential axial force-bearing component on the rotating shaft is the thrust disk. The axial magnetic bearing and the thrust disk are made of a pure iron solid structure, with relatively large self-loss, general thermal conductivity, and a narrow space. If 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 heat from the magnetic bearing. The cooling air is input from the outside and passes through the gap between the bearing stator and the thrust disk to dissipate heat from the axial magnetic bearing, but the heat dissipation efficiency is not high.

[0004] Due to the technical problems such as poor cooling and heat dissipation of the magnetic levitation bearings inside the rotating machines in the prior art, the utility model researches and designs 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 bearings inside the rotating machines in the prior art, so as to provide a magnetic levitation rotating machine.

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

[0007] A magnetic levitation bearing, a motor stator and a rotor. The motor stator is located on the radial outer periphery of a partial shaft section of the rotor. An axial motor stator flow channel is formed on the motor stator along the axial direction. A rotor air gap exists between the part of the rotor opposite to the motor stator to form a motor rotor flow channel. Both the motor stator flow channel and the motor rotor flow channel can conduct gas. The magnetic levitation bearing is located on one axial side of the motor stator and can support the rotor.

[0008] The magnetic levitation bearing includes an axial stator 1, an axial stator 2, and a thrust disk. In the axial direction of the magnetic levitation bearing, the thrust disk is disposed between the axial stator 1 and the axial stator 2. A thrust disk ventilation hole penetrates through the thrust disk from one axial end face to the other axial end face. The axial stator 1 includes a radially outer portion 1 and a radially inner portion 1. The radially outer portion 1 and the radially inner portion 1 are spaced apart in the radial direction of the axial stator 1, and a coil slot 1 is formed therebetween. A coil 1 is disposed in the coil slot 1;

[0009] The thrust disk ventilation hole includes a first thrust disk air inlet hole extending from one axial end face 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 face of the thrust disk towards the inside of the thrust disk. One end of the first thrust disk air inlet hole located inside the thrust disk communicates with one end of the second thrust disk air inlet hole located inside the thrust disk. After communication, it is further communicated to the outer periphery of the thrust disk through a thrust disk air outlet hole. One end of the first thrust disk air inlet hole located at one axial end face of the thrust disk is axially opposite to the position of the coil slot 1, and the one end of the first thrust disk air inlet hole is not axially opposite to the magnetic pole position of the axial stator 1;

[0010] The axial stator 1 further includes an axially outer portion 1. The axially outer portion 1 is disposed away from the thrust disk relative to the coil 1 in the axial direction of the magnetic levitation bearing,

[0011] An air bearing stator ventilation hole 1 is provided on the axially outer portion 1 of the axial stator 1. The air bearing stator ventilation hole 1 penetrates through from one axial end face of the axially outer portion 1 to the other axial end face. The air bearing stator ventilation hole 1 can communicate with the first thrust disk air inlet hole; both the motor rotor flow channel and the motor stator flow channel can communicate with the air bearing stator ventilation hole 1.

[0012] In some embodiments,

[0013] Inside the coil slot 1, a second gap is formed between the radially inner side of the coil 1 and the radially inner portion 1, forming a first gas flow path,

[0014] Inside the coil slot 1, a third gap is also formed between the axially outer portion 1 and the coil 1, forming an air bearing stator ventilation slot 1;

[0015] The air bearing stator ventilation hole 1 communicates with the air bearing stator ventilation slot 1 and further communicates with the first thrust disk air inlet hole through the first gas flow path.

[0016] In some embodiments,

[0017] It further includes a first cover plate located between the first axial stator and the thrust disc. One axial end face of the first cover plate is in contact with the first radial outer part of the first axial stator, and the other axial end face of the first cover plate faces the thrust disc.

[0018] The pole positions of the first axial stator include the part of the first cover plate facing the thrust disc and the part of the first radial inner part facing the thrust disc. There is a first gap between the first cover plate and the first radial inner part. The first thrust disc air inlet hole is axially opposite to the first gap, and the radial dimension of the first gap is greater than or equal to the radial dimension of the first thrust disc air inlet hole.

[0019] In some embodiments,

[0020] In any radial cross-section of the thrust disc, the cross-sectional area of the magnetic path flowing position of the first axial stator = the radial cross-sectional area of the part of the thrust disc opposite to the first axial stator - the cross-sectional area of the thrust disc ventilation hole - the cross-sectional area of the thrust disc air outlet hole ≥ the cross-sectional area of the pole position of the first axial stator.

[0021] In some embodiments,

[0022] Along the axial direction of the thrust disc, the first thrust disc air inlet hole is an inclined hole structure whose extending direction is not parallel to the axis of the thrust disc. From the observation direction from one axial end face of the thrust disc to the other axial end face, the rotation direction of the thrust disc is the first rotation direction, and the extending direction of the first thrust disc 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.

[0023] In some embodiments,

[0024] There are multiple first thrust disc air inlet holes, and the multiple first thrust disc air inlet holes are arranged at intervals along the circumferential direction of the thrust disc. The extending direction of each first thrust disc 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 disc.

[0025] In some embodiments,

[0026] The second axial stator includes a second radial outer part and a second radial inner part. The second radial outer part and the second radial inner part are spaced apart in the radial direction of the second axial stator, and a coil slot two is formed therebetween. A coil two is arranged in the coil slot two. One end of the second thrust disc air inlet hole located at the other axial end face of the thrust disc is axially opposite to the position of the coil slot two, and the one end of the second thrust disc air inlet hole is not opposite to the pole position of the second axial stator.

[0027] The axial stator two further includes an axial outer portion two, and the axial outer portion two is arranged away from the thrust disk relative to the coil two in the axial direction of the magnetic suspension bearing.

[0028] A bearing stator ventilation hole two is arranged on the axial outer portion two of the axial stator two, and the bearing stator ventilation hole two penetrates from one axial end face of the axial outer portion two to the other axial end face, and the bearing stator ventilation hole two can communicate with the second thrust disk air inlet hole.

[0029] The motor rotor flow channel and the motor stator flow channel can respectively communicate with the bearing stator ventilation hole one or the bearing stator ventilation hole two.

[0030] In some embodiments,

[0031] Inside the coil slot two, a fifth gap is formed between the radially inner side of the coil two and the radially inner portion two, forming a second gas flow path.

[0032] Inside the coil slot two, a sixth gap is also formed between the axial outer portion two and the coil two, forming a bearing stator ventilation slot two.

[0033] The bearing stator ventilation hole two communicates with the bearing stator ventilation slot two and further communicates with the second thrust disk air inlet hole through the second gas flow path.

[0034] In some embodiments,

[0035] It further includes a cover plate two, the cover plate two is located between the axial stator two and the thrust disk, and one axial end face of the cover plate two is connected to the radially outer portion two of the axial stator two, and the other axial end face of the cover plate two faces the thrust disk.

[0036] The magnetic pole position of the axial stator two includes the part where the cover plate two faces the thrust disk and the part where the radially inner portion two faces the thrust disk. A fourth gap is formed between the cover plate two and the radially inner portion two. The second thrust disk air inlet hole is axially opposite to the fourth gap, and the radial dimension of the fourth gap is greater than or equal to the radial dimension of the second thrust disk air inlet hole.

[0037] In some embodiments,

[0038] In each radial cross-section of the thrust disk, the cross-sectional area of the magnetic circuit flow-through position of the axial stator two = the radial cross-sectional area of the part of the thrust disk opposite to the axial stator two - the cross-sectional area of the thrust disk ventilation hole - the cross-sectional area of the thrust disk air outlet hole ≥ the cross-sectional area of the magnetic pole position of the axial stator two.

[0039] In some embodiments,

[0040] Along the axial direction of the thrust disc, the second thrust disc air inlet hole is an inclined hole structure whose extending direction is not parallel to the axis of the thrust disc. From the observation direction of the axial other end face of the thrust disc towards its axial one end face, the rotation direction of the thrust disc is towards the third rotation direction, the extending direction of the second thrust disc air inlet hole from the axial other end face to the axial one end face is towards the fourth rotation direction, and the fourth rotation direction is opposite to the third rotation direction.

[0041] In some embodiments,

[0042] There are multiple second thrust disc air inlet holes, and the multiple second thrust disc air inlet holes are arranged at intervals along the circumferential direction of the thrust disc. Moreover, the extending direction of each second thrust disc air inlet hole from the axial other end face to the axial one end face is towards the fourth rotation direction, and all are opposite to the third rotation direction of the thrust disc.

[0043] In some embodiments,

[0044] The first thrust disc air inlet hole, the thrust disc air outlet hole and the second thrust disc air inlet hole correspond to each other one by one to form a set of air outlet units. There are multiple sets of the air outlet units, and the multiple sets of air outlet units are arranged at intervals along the circumferential direction of the thrust disc.

[0045] In some embodiments,

[0046] When the thrust disc satisfies magnetic saturation, the axial width of the magnetic circuit flow area is at least N, and the axial aperture of the thrust disc air outlet hole = the axial thickness of the thrust disc - N.

[0047] In some embodiments,

[0048] The outer circumferences of the axial stator one and the axial stator two further have a cylinder body. At a position of the cylinder body opposite to the thrust disc air outlet hole of the thrust disc, a bearing air outlet is further provided, which can be used to connect with the thrust disc air outlet hole and exhaust outwards.

[0049] In some embodiments,

[0050] It further includes a rear end cover, a cooling impeller, a rear housing and a rear radial bearing. The cooling impeller is arranged at one axial end of the rotor so as to rotate integrally with the rotor. The cooling impeller is arranged inside the rear end cover. A first air inlet axially penetrating is provided at the central axis position of the rear end cover, and the first air inlet faces the cooling impeller. The magnetic suspension bearing and the motor stator are both located inside the cylinder body;

[0051] The rear housing is axially connected between the rear end cover and the cylinder body, and a rear housing flow channel is axially arranged on the rear housing. One end of the rear housing flow channel can be respectively communicated with the motor rotor flow channel and the motor stator flow channel, and the other end of the rear housing flow channel can be communicated with the impeller air outlet of the cooling impeller;

[0052] So that the air flow can sequentially pass through the first air inlet, the cooling impeller, the interior of the rear end cover and the rear housing flow channel and enter the motor rotor flow channel and the motor stator flow channel.

[0053] In some embodiments,

[0054] It further includes a front radial bearing, a front housing and a front end cover. The front radial bearing and the front housing are both located on the axial side of the magnetic suspension bearing away from the motor stator. There is a front radial bearing flow channel between the front radial bearing and the outer periphery of the rotor, and a front housing flow channel between the front housing and the outer periphery of the rotor. The front end cover is arranged on the axial side of the cylinder body away from the rear end cover, and a receiving space is formed at an interval between the front end cover and the front housing;

[0055] A volute is arranged on the outer periphery of the front end cover. A main impeller is arranged at the other axial end of the rotor. The main impeller is located in the volute. A second air inlet is arranged at the central axis position of the volute. The second air inlet faces the main impeller. There is a leakage channel between the main impeller and the front end cover, and a front end cover flow channel between the front end cover and the outer periphery of the rotor.

[0056] So that the second air inlet, the main impeller, the leakage channel, the front end cover flow channel, the receiving space, the front housing flow channel, the front radial bearing flow channel and the air duct of the magnetic suspension bearing are sequentially communicated, and then exhausted through the bearing air outlet.

[0057] A magnetic suspension rotating machine provided by the present utility model has the following beneficial effects:

[0058] 1. The present utility model realizes self - active air intake and heat exchange through the thrust disk ventilation holes and thrust disk air outlet holes opened on the thrust disk. The thrust disk ventilation holes include a first thrust disk air inlet hole extending from one axial end face 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 face of the thrust disk towards the inside of the thrust disk. It can achieve self - active air intake and heat exchange through high 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 pole position of the axial stator one, so that no hole is punched at the position of the thrust disk end face facing the pole of the axial stator one, preventing the cooling air from directly reaching the pole gap position, effectively avoiding the influence of the cooling gas and the holes on the magnetic furnace structure, thus avoiding insufficient magnetic suspension axial supporting force, achieving improved heat dissipation and cooling of the magnetic suspension bearing while avoiding affecting the magnetic suspension magnetic circuit, ensuring sufficient magnetic suspension supporting force, and effectively reducing the influence of gas force on the axial force. The present utility model also preferably sets the thrust disk ventilation holes at the position corresponding to the coil between the upper and lower axial magnetic poles, with the hole diameter size ≤ the radial distance between the upper and lower magnetic poles of the axial stator, which can further effectively avoid the pole position, further avoid affecting the magnetic circuit, and the thrust disk ventilation holes are connected to the ventilation paths at both ends without obstruction, making the air flow resistance at both ends of the thrust disk small and the fluidity good;

[0059] The present utility model also sets a motor stator flow channel on the motor stator and a motor rotor flow channel on the rotor, enabling the cooling gas at the air inlet to be divided into two paths and enter the motor rotor and the motor rotor respectively from the rear housing, and then converge and flow out from the axial magnetic suspension bearing (thrust disk inclined hole + axial bearing stator ventilation hole), increasing the air flow area for the magnetic suspension bearing and the motor stator, further improving the cooling and heat dissipation efficiency and performance of the magnetic suspension machinery; and the present utility model has two air inlets at both axial ends respectively, enabling the two - path gas to flow towards the magnetic suspension bearing, mixing inside the thrust disk of the magnetic suspension bearing, and finally discharging from the bearing air outlet, increasing the air flow path for the magnetic suspension bearing, increasing the heat exchange area, and improving the cooling and heat dissipation performance.

[0060] 2. The present utility model further sets a relationship in any radial section of the thrust disc, i.e., the cross-sectional area of the magnetic path flow-through position of the axial stator 1 = the radial cross-sectional area of the relative part of the thrust disc and the axial stator 1 - the cross-sectional area of the ventilation holes of the thrust disc - the cross-sectional area of the air outlet holes of the thrust disc ≥ the cross-sectional area of the magnetic pole position of the axial stator 1, so that other magnetic path parts on the thrust disc different from the magnetic pole position will not show magnetic field saturation prior to the magnetic pole position, ensuring the formation of a normal magnetic flux loop and the continuous and effective provision of magnetic levitation supporting force; the present utility model also sets the first thrust disc air inlet hole to extend from one axial end face to the other axial end face in a direction towards the second rotation direction, and the second rotation direction is opposite to the first rotation direction (the rotation direction of the thrust disc). When the rotor drives the thrust disc to rotate at high speed, negative pressure can be generated to suck out the hot air at one end and discharge it to the outside, increasing the gas flow rate, 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 at the same time improving the energy efficiency; at the same time, in cooperation with the bearing stator ventilation hole 1 provided on the outer part 1 of the axis, and the stator ventilation groove 1 and the gas flow path (multiple gas flow paths) in the axial stator coil slot, the gas flow in the cavity of the axial stator coil slot can be further accelerated, realizing the effective independent heat dissipation of the axial coil and the thrust disc. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] Figure 1 is the longitudinal sectional perspective view of the magnetic levitation bearing of the magnetic levitation rotating machine of the present utility model;

[0062] Figure 2 is Figure 1 the three-dimensional internal structure diagram of the thrust disc structure in

[0063] Figure 3 is the three-dimensional structure diagram of the axial stator core of the magnetic levitation bearing of the present utility model;

[0064] Figure 4 is the longitudinal sectional view of the magnetic levitation rotating machine of the present utility model.

[0065] The reference numerals are shown as:

[0066] 1. Axial stator one; 11. Radial outer part one; 12. Radial inner part one; 13. Coil slot one; 14. Axial outer part one; 2. Axial stator two; 21. Radial outer part two; 22. Radial inner part two; 23. Coil slot two; 24. Axial outer part two; 3. Thrust disk; 4. Cover plate one; 4'. Cover plate two; 5. Coil one; 5'. Coil two; 6. Rotor; 10. Cooling impeller; 110. Deflector; 120. Rear end cover; 121. First air inlet; 130. Rear housing; 140. Rear radial bearing; 15. Motor stator; 17. Front radial bearing; 18. Front housing; 19. Cylinder; 20. Front end cover; 210. Impeller air outlet; 220. Rear housing flow channel; 230. Motor stator flow channel; 25. Motor rotor flow channel; 26. Bearing air outlet; 29. Leakage channel; 30. Main impeller; 31. Volute; 311. Second air inlet;

[0067] 01. First thrust disk air inlet hole; 02. Second thrust disk air inlet hole; 03. Bearing stator ventilation hole one; 03'. Bearing stator ventilation hole two; 04. Bearing stator ventilation slot one; 04'. Bearing stator ventilation slot two; 05. First gap; 06. First gas flow path; 07. Fourth gap; 08. Second gas flow path; 09. Thrust disk air outlet hole. Detailed implementation mode

[0068] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way limits the present invention and its application or use. Based on the embodiments in 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.

[0069] It should be noted that the terms used here are only for describing specific implementation modes and are not intended to limit the exemplary implementation modes according to the present application. As used here, 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 "include" and / or "comprise" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or their combinations.

[0070] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present utility model. At the same time, it should be understood that for the sake of convenience in 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, such technologies, methods, and devices should be regarded as part of the authorization specification. In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0071] In the description of the present utility model, it should be understood that the orientation or positional relationships indicated by orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal", and "top, bottom", etc., are generally based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Without contrary statements, these orientation words do not indicate and imply that the devices or elements referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus should not be construed as limiting the protection scope of the present utility model; the orientation words "inside, outside" refer to the inside and outside relative to the contours of the respective components.

[0072] For the convenience of description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "above-mentioned", etc., can be used here to describe the spatial positional relationships between a device or feature shown in the drawings and other devices or features. It should be understood that the spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation described in the drawings for the device. For example, if the device in the drawing is inverted, the device described as "above other devices or structures" or "over other devices or structures" will then be positioned "below other devices or structures" or "under other devices or structures". Thus, the exemplary term "above..." can include both the orientations of "above..." and "below...". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations should be made for the spatial relative descriptions used here.

[0073] In addition, it should be noted that the use of words such as "first", "second", etc. to limit components is only for the convenience of differentiating the corresponding components. Without additional statements, the above words have no special meanings, and thus should not be construed as limiting the protection scope of the present utility model.

[0074] such asFigures 1-4 As shown in the figure, the present utility model provides a magnetic levitation rotating machine, which is characterized in that it includes:

[0075] A magnetic levitation bearing, a motor stator 15 and a rotor 6. The motor stator 15 is located on the radial outer periphery of a partial shaft section of the rotor 6. A motor stator flow channel 230 is axially formed on the motor stator. There is a rotor air gap between the part of the rotor 6 opposite to the motor stator to form a motor rotor flow channel 25 (that is, a motor rotor flow channel is formed between the rotor and the stator). Both the motor stator flow channel 230 and the motor rotor flow channel 25 can conduct gas. The magnetic levitation bearing is located on one axial side of the motor stator and can support the rotor 6;

[0076] The magnetic levitation bearing includes an axial stator one 1, an axial stator two 2 and a thrust disk 3. In the axial direction of the magnetic levitation bearing, the thrust disk 3 is arranged between the axial stator one 1 and the axial stator two 2. A thrust disk ventilation hole penetrates through the thrust disk 3 from one axial end face to the other axial end face. The axial stator one 1 includes a radial outer part one 11 and a radial inner part one 12. The radial outer part one 11 and the radial inner part one 12 are spaced apart in the radial direction of the axial stator one 1, and a coil slot one 13 is formed therebetween. A coil one 5 is arranged in the coil slot one 13;

[0077] The thrust disk ventilation hole includes a first thrust disk air inlet hole 01 extending from one axial end face 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 face 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 periphery of the thrust disk 3 through a thrust disk air outlet hole 09. One end of the first thrust disk air inlet hole 01 located on one axial end face of the thrust disk 3 is axially opposite to the position of the coil slot one 13, and the one end of the first thrust disk air inlet hole 01 is not opposite to the magnetic pole position of the axial stator one 1;

[0078] The axial stator one 1 further includes an axial outer part one 14. The axial outer part one 14 is arranged away from the thrust disk 3 relative to the coil one 5 in the axial direction of the magnetic levitation bearing,

[0079] On the outer axial part 14 of the axial stator 1, there is a bearing stator ventilation hole 03, which penetrates from one axial end face of the outer axial part 14 to the other axial end face, and the bearing stator ventilation hole 03 can communicate with the first thrust disk air inlet hole 01; both the motor rotor flow channel 25 and the motor stator flow channel 230 can communicate with the bearing stator ventilation hole 03.

[0080] In the present utility model, through the thrust disk ventilation holes and thrust disk air outlet holes provided on the thrust disk, the thrust disk ventilation holes include a first thrust disk air inlet hole extending from one axial end face 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 face of the thrust disk towards the inside of the thrust disk. It can achieve self - active air intake and heat exchange through high speed rotation, 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 suspension bearing. And making the first thrust disk air inlet hole not opposite to the magnetic pole position of the axial stator 1 can prevent the thrust disk end face from punching holes at the magnetic pole position directly facing the axial stator 1, so that the cooling air cannot directly reach the magnetic pole gap position, effectively avoiding the influence of the cooling gas and the holes 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 affecting the magnetic suspension magnetic circuit, ensuring sufficient magnetic suspension supporting force, and effectively reducing the influence of gas force on the axial force; In the present utility model, there is also a bearing stator ventilation hole 03 provided on the outer axial part 1, and the bearing stator ventilation hole 03 can communicate with the first thrust disk air inlet hole, which can provide an air flow passage, further accelerate the gas flow in the cavity of the axial stator coil slot, and achieve effective self - heat dissipation between the axial coil and the thrust disk.

[0081] In the present utility model, by providing a motor stator flow channel on the motor stator and a motor rotor flow channel on the rotor, the cooling gas at the air inlet can be divided into two paths and enter the motor rotor and the motor rotor respectively from the rear housing, and then converge and flow out from the axial magnetic bearing (thrust disk inclined hole + axial bearing stator ventilation hole), increasing the air flow area for the magnetic suspension bearing and the motor stator, and further improving the cooling and heat dissipation efficiency and performance of the magnetic suspension machine.

[0082] In some embodiments,

[0083] Inside the coil slot 13, there is a second gap between the radial inner side of the coil 5 and the radial inner part 12, forming a first gas flow path 06.

[0084] Inside the coil slot 13, there is also a third gap between the axially outer part 14 and the coil 5, forming the bearing stator ventilation slot 04.

[0085] The bearing stator ventilation hole 03 communicates with the bearing stator ventilation slot 04 and further communicates with the first thrust plate air inlet hole 01 through the first gas flow path 06.

[0086] By providing the bearing stator ventilation hole 1 on the axially outer part, the stator ventilation slot 1 and the gas flow path in the axially stator coil slot, the utility model can form multiple gas flow paths flowing from both sides to the thrust plate ventilation hole in the middle of the thrust plate, which can further accelerate the gas flow in the cavity of the axially stator coil slot and realize the effective independent heat dissipation of the axial coil and the thrust plate.

[0087] In some embodiments,

[0088] It further includes a cover plate 4. The cover plate 4 is located between the axial stator 1 and the thrust plate 3. One axial end face of the cover plate 4 is in contact with the radially outer part 11 of the axial stator 1, and the other axial end face of the cover plate 4 faces the thrust plate 3.

[0089] The magnetic pole position of the axial stator 1 includes the part where the cover plate 4 faces the thrust plate 3 and the part where the radially inner part 12 faces the thrust plate 3. There is a first gap 05 between the cover plate 4 and the radially inner part 12. The first thrust plate air inlet hole 01 is axially opposite to the first gap 05, and the radial dimension of the first gap 05 is greater than or equal to the radial dimension of the first thrust plate air inlet hole 01.

[0090] The utility model also preferably sets the thrust plate ventilation hole at the position directly opposite to the coil between the upper and lower axial magnetic poles, and the aperture size ≤ the radial distance between the upper and lower magnetic poles of the axial stator, which can further effectively avoid the magnetic pole position of the first thrust plate air inlet hole, further avoid affecting the magnetic circuit, and the thrust plate 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 plate small and the fluidity good; and the bearing stator ventilation hole 1, the bearing stator ventilation slot 1, the first gas flow path, the first gap and the first thrust plate air inlet hole are connected in sequence to form an air flow channel.

[0091] In some embodiments,

[0092] In any radial cross-section of the thrust plate 3, the cross-sectional area of the position where the magnetic circuit of the axial stator 1 flows through = the radial cross-sectional area of the part of the thrust plate opposite to the axial stator 1 - the cross-sectional area of the thrust plate ventilation hole - the cross-sectional area of the thrust plate air outlet hole 09 ≥ the cross-sectional area of the magnetic pole position of the axial stator 1.

[0093] The utility model further sets a relationship in any radial cross-section of the thrust disk, that is, the cross-sectional area of the magnetic circuit flowing-through position of the axial stator 1 = the radial cross-sectional area of the relative part of the thrust disk and the axial stator 1 - the cross-sectional area of the ventilation holes of the thrust disk - the cross-sectional area of the air outlet holes of the thrust disk ≥ the cross-sectional area of the magnetic pole position of the axial stator 1, so that other magnetic circuit parts on the thrust disk different from the magnetic pole position will not saturate the magnetic field prior to the magnetic pole position, ensuring the formation of a normal magnetic flux loop and the continuous and effective provision of the magnetic levitation supporting force.

[0094] In some embodiments,

[0095] Along the axial direction of the thrust disk 3, the first thrust disk air inlet hole 01 has 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 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.

[0096] The utility model also sets the first thrust disk air inlet hole to extend 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 while also improving the energy efficiency.

[0097] For the convenience of negative pressure air intake in the utility model, the direction of the inner ring air inlet is opposite to the rotating direction, the air inlet hole is > 90° with the rotating direction in the circumferential direction, and the air outlet hole is ≥ 90° with the rotating 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 elliptical holes are preferred.

[0098] In some embodiments,

[0099] The first thrust disk air inlet holes 01 are multiple, and the multiple first thrust disk air inlet holes 01 are arranged at intervals along the circumferential direction of the thrust disk 3, and the extending direction of each 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 is opposite to the first rotating direction of the thrust disk 3.

[0100] The present utility model provides a magnetically levitated rotating machine (preferably a blower) with active and efficient heat dissipation. The thrust disk adopts a Y-shaped inclined hole solution to achieve self-priming air heat exchange through high rotational speed, increasing the gas flow rate introduced, accelerating the cooling of the axial magnetic bearing, and cooperating with the overall active pure air-cooled heat dissipation of the magnetically levitated rotating machine. It uses the coaxial impeller at the other end of the main impeller or the negative pressure cooling caused by the rotation of the rotor or the leakage cooling of the main impeller for cooling, changing from the previous external passive heat dissipation to internal active heat dissipation, improving the heat dissipation efficiency while reducing the heat dissipation cost. This cooling solution for the magnetically levitated rotating machine can effectively ventilate and dissipate heat for the motor stator, motor rotor, magnetic bearing, etc., and can also better dissipate heat for the axial magnetic bearing, improving the stability of the magnetic levitation system.

[0101] In some embodiments,

[0102] The axial stator two 2 includes a radially outer part two 21 and a radially inner part two 22. The radially outer part two 21 and the radially inner part two 22 are spaced apart in the radial direction of the axial stator two 2, and a coil slot two 23 is formed therebetween. A coil two 5' is disposed in the coil slot two 23. The second thrust disk air inlet hole 02 is located at one end of the axial other end face of the thrust disk 3 and is opposite to the position of the coil slot two 23 in the axial direction, and the one end of the second thrust disk air inlet hole 02 is not opposite to the magnetic pole position of the axial stator two 2;

[0103] The axial stator two 2 further includes an axially outer part two 24. The axially outer part two 24 is disposed away from the thrust disk 3 in the axial direction of the magnetic levitation bearing relative to the coil two 5'.

[0104] An air vent hole for bearing stator two 03' is provided on the axially outer part two 24 of the axial stator two 2. The air vent hole for bearing stator two 03' penetrates from one axial end face of the axially outer part two 24 to the other axial end face, and the air vent hole for bearing stator two 03' can communicate with the second thrust disk air inlet hole 02;

[0105] The motor rotor flow channel 25 and the motor stator flow channel 230 can respectively communicate with the air vent hole for bearing stator one 03 or the air vent hole for bearing stator two 03'.

[0106] The present utility model further enables the position of the air inlet hole of the second thrust disc at the other axial end face of the thrust disc not to be opposite to the magnetic pole position of the axial stator II, so that no hole is punched at the position of the thrust disc end face opposite to the magnetic pole position of the axial stator II, preventing the cooling air from directly reaching the magnetic pole gap position of the axial stator II. This can further effectively avoid the influence of the cooling gas and the opening on the structure of the magnetic furnace, further prevent insufficient magnetic levitation axial supporting force, further achieve improved heat dissipation and cooling of the magnetic levitation bearing while avoiding affecting the magnetic levitation magnetic circuit, further improve the magnetic levitation supporting force, and effectively reduce the influence of gas force on the axial force. The present utility model also has a bearing stator ventilation hole I provided on the outer axial part I, and the bearing stator ventilation hole I can communicate with the air inlet hole of the first thrust disc, providing an air flow passage, which can further accelerate the gas flow in the cavity of the axial stator coil slot and achieve effective independent heat dissipation of the axial coil and the thrust disc. Moreover, the bearing stator ventilation holes I and II of the present utility model communicate with the motor rotor flow channel and the motor stator flow channel, providing two gas flow channels to dissipate heat from the motor rotor and the motor stator respectively, cooling and dissipating heat from the magnetic levitation bearing from two paths, and further improving the cooling and heat dissipation efficiency of the magnetic levitation rotating machinery.

[0107] In some embodiments,

[0108] Inside the coil slot II 23, there is a fifth gap between the radially inner side of the coil II 5' and the radially inner part II 22, forming a second gas flow path 08.

[0109] Inside the coil slot II 23, there is also a sixth gap between the outer axial part II 24 and the coil II 5', forming a bearing stator ventilation slot II 04'.

[0110] The bearing stator ventilation hole II 03' communicates with the bearing stator ventilation slot II 04', and further communicates with the second thrust disc air inlet hole 02 through the second gas flow path 08.

[0111] By providing the bearing stator ventilation hole II on the outer axial part II, as well as the stator ventilation slot II and the gas flow path in the axial stator coil slot, the present utility model can form multiple gas flow paths that flow from both sides towards the thrust disc ventilation hole of the middle thrust disc, which can further accelerate the gas flow in the cavity of the axial stator coil slot and achieve effective independent heat dissipation of the axial coil and the thrust disc.

[0112] In some embodiments,

[0113] It further includes a second cover plate 4', the second cover plate 4' is located between the axial stator two 2 and the thrust disk 3, and one axial end face of the second cover plate 4' is in contact with the second radial outer part 21 of the axial stator two 2, and the other axial end face of the second cover plate 4' faces the thrust disk 3;

[0114] The magnetic pole positions of the axial stator two 2 include the part where the second cover plate 4' faces the thrust disk 3 and the part where the second radial inner part 22 faces the thrust disk 3. There is a fourth gap 07 between the second cover plate 4' and the second radial inner part 22. The second thrust disk air inlet hole 02 is opposite to the fourth gap 07 in the axial direction, and the radial dimension of the fourth gap 07 is greater than or equal to the radial dimension of the second thrust disk air inlet hole 02.

[0115] The present utility model preferably further sets the second thrust disk air inlet hole at the position directly opposite to the coil between the upper and lower magnetic poles of the axial stator two, and the aperture size ≤ the radial distance between the upper and lower magnetic poles of the axial stator, which can further effectively avoid the magnetic pole positions by the second thrust disk air inlet 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; and the bearing stator ventilation hole two, the bearing stator ventilation groove two, the second gas flow path, the second gap and the second thrust disk air inlet hole are connected in sequence to form an air flow channel.

[0116] In some embodiments,

[0117] In each radial section of the thrust disk 3, the cross-sectional area of the position where the magnetic circuit of the axial stator two 2 flows through = the radial cross-sectional area of the part of the thrust disk opposite to the axial stator two - the cross-sectional area of the thrust disk ventilation hole - the cross-sectional area of the thrust disk air outlet hole 09 ≥ the cross-sectional area of the magnetic pole position of the axial stator two 2.

[0118] The present utility model further sets the thrust disk ventilation hole at the position directly opposite to the coil between the upper and lower magnetic poles of the axial stator two, and further makes the aperture size of the thrust disk ventilation hole ≤ the radial distance between the upper and lower magnetic poles of the axial stator two, which can further effectively avoid the magnetic pole positions of the axial stator two by the thrust disk 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.

[0119] In some embodiments,

[0120] Along the axial direction of the thrust disc 3, the second thrust disc air inlet 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 of the axial other end face of the thrust disc 3 towards its axial one end face, the rotation direction of the thrust disc 3 is the third rotation direction, and the extending direction of the second thrust disc air inlet hole 02 from the axial other end face to the axial one end face is towards the fourth rotation direction, and the fourth rotation direction is opposite to the third rotation direction.

[0121] The utility model also sets the second thrust disc air inlet hole so that its extending direction from the axial other end face to the axial one end face is towards the fourth rotation direction, and the fourth rotation direction is opposite to the third rotation direction (the rotation direction of the thrust disc). 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 flow rate of the introduced gas, realizing the active ventilation and heat exchange of the thrust disc itself, accelerating the gas flow, saving energy consumption, and improving the heat dissipation performance while also improving the energy efficiency.

[0122] Along the direction from the axial one end face to the axial other end face, the first rotation direction is the third rotation direction, the fourth rotation direction is the same as the second rotation direction, and the first and second thrust disc air inlet holes and the thrust disc air outlet hole together form a Y-shaped inclined hole, with air intake from both sides towards the middle and discharged through the thrust disc air outlet hole.

[0123] For facilitating negative pressure air intake, the direction of the inner ring air inlet is opposite to the rotation direction, the air inlet hole is >90° with the rotation direction in the circumferential direction, and the air outlet hole is ≥90° with the rotation direction in the radial direction. There is no requirement for the hole shape. For facilitating machining and technology, circular holes, rectangular round holes or oval holes are preferred.

[0124] In some embodiments,

[0125] There are multiple second thrust disc air inlet holes 02, and the multiple second thrust disc air inlet holes 02 are arranged at intervals along the circumferential direction of the thrust disc 3, and the extending direction of each second thrust disc air inlet hole 02 from the axial other end face to the axial one end face is towards the fourth rotation direction, and is opposite to the third rotation direction of the thrust disc 3.

[0126] In some embodiments,

[0127] The first thrust disc air inlet hole 01, the thrust disc air outlet hole 09 and the second thrust disc air inlet hole 02 correspond to each other one by one to form a set of air outlet units. There are multiple sets of the air outlet units, and the multiple sets of air outlet units are arranged at intervals along the circumferential direction of the thrust disc 3.

[0128] Through the setting 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.

[0129] In some embodiments,

[0130] When the thrust disk 3 reaches magnetic saturation, the minimum axial width of the magnetic circuit flow area is N, and the axial aperture of the air outlet hole 09 of the thrust disk = the axial thickness of the thrust disk 3 - N. In the present utility model, it is preferred that when the thrust disk reaches magnetic saturation, the minimum axial width of the magnetic circuit flow area is N, and the axial aperture of the air outlet = the thickness of the thrust disk - N, which can effectively ensure the maximum heat dissipation channel without affecting the axial magnetic circuit conduction.

[0131] In some embodiments,

[0132] The outer periphery of the axial stator one 1 and the axial stator two 2 further has a cylinder body 6, and a bearing air outlet 26 is also provided at a position of the cylinder body 6 opposite to the air outlet hole 09 of the thrust disk 3, which can be used to connect with the air outlet hole 09 of the thrust disk and exhaust outwards.

[0133] Through the bearing air outlet provided on the outermost cylinder body of the present utility model, which is opposite to the air outlet of the thrust disk, the gas discharged from the air outlet hole of the thrust disk can be led out, so that the gas entering from the first and second thrust disk air inlet holes on both sides respectively can be discharged from the bearing air outlet after cooling the coil, rotor and other structures of the magnetic levitation bearing, ensuring the smoothness of gas flow and improving the cooling effect.

[0134] The axial magnetic bearing of the present utility model preferably adopts active ventilation cooling. The thrust disk is installed on the rotor. Oblique holes are drilled on both sides near the inner ring at the part of the thrust disk facing the axial bearing ventilation groove to the middle, and then through holes are drilled upwards to the outer ring surface of the thrust disk. Several Y-shaped oblique holes are circumferentially opened at the part of the thrust disk facing the axial bearing ventilation groove. The air inlet direction is opposite to the rotation direction of the rotor. When the rotor drives the thrust disk to rotate at high speed, negative pressure is generated to suck out the hot air at one end and discharge it to the outside, increasing the flow rate of the introduced gas, realizing the active ventilation and heat exchange of the thrust disk itself. At the same time, it cooperates with the ventilation holes and ventilation grooves in the axial stator coil slot to accelerate the gas flow in the axial bearing cavity area and realize the effective independent heat dissipation of the axial magnetic bearing.

[0135] According to the principle of axial magnetic levitation bearings, the relative position of the thrust disk 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 disk faces the magnetic pole directly to avoid insufficient axial force. At the same time, the cooling air cannot directly reach the magnetic pole gap position to reduce the influence of gas reaction force on the axial force. Therefore, the magnetic levitation bearing requires that the cooling holes cannot be directly opposite to the magnetic pole gap position. According to the requirements of axial magnetic circuit circulation, to ensure that magnetic saturation does not occur at other positions prior to the magnetic pole position, in the radial circumferential direction, the cross-sectional area of the position where the magnetic circuit flows through ≥ the cross-sectional area of the magnetic pole position. The air inlet is located at the position directly opposite to the coil between the upper and lower axial magnetic poles, and the aperture size ≤ the radial distance between the upper and lower magnetic poles of the axial stator. In each radial circumferential direction, the cross-sectional area of the position where the magnetic circuit flows through = the radial circumferential cross-sectional area of the thrust disk - the cross-sectional area in the same direction of the hole position ≥ the cross-sectional area of the magnetic pole position. Preferably, when the thrust disk satisfies magnetic saturation, the minimum axial width of the magnetic circuit flow area is N, and the axial aperture of the air outlet = the thickness of the thrust disk - N, which ensures the largest heat dissipation channel while not affecting the conduction of the axial magnetic circuit. To facilitate negative pressure air intake, the direction of the inner ring air inlet is opposite to the rotation direction, the air inlet 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 elliptical holes are preferred.

[0136] The entire system uses an active pure air-cooled heat dissipation system for heat dissipation. The cold air is driven by a coaxial impeller at the other end of the main impeller, or by the centrifugal air intake during rotor rotation, or by the leakage air intake of the main impeller. No additional heat dissipation drive motor is required. The flow rate of the heat dissipation cold air is adjusted by the motor speed, and no additional controller is required. The overall internal flow channel layout guides the cold air to each component for targeted heat dissipation. The entire heat dissipation system has a simple structure and an efficient and reliable heat dissipation process.

[0137] In some embodiments,

[0138] It further includes a rear end cover 120, a cooling impeller 10, a rear housing 130 and a rear radial bearing 140. The cooling impeller 10 is arranged at one axial end of the rotor 6 so as to rotate integrally with the rotor 6. The cooling impeller 10 is arranged inside the rear end cover 120. An axially penetrating first air inlet 121 is provided at the central axis position of the rear end cover 120, and the first air inlet 121 is directly opposite to the cooling impeller 10. The magnetic levitation bearing and the motor stator are both located inside the cylinder 19;

[0139] The rear housing 130 is axially connected between the rear end cover 120 and the cylinder 19, and a rear housing flow channel 220 is axially provided on the rear housing 130. One end of the rear housing flow channel 220 can be respectively communicated with the motor rotor flow channel 25 and the motor stator flow channel 230, and the other end of the rear housing flow channel 220 can be communicated with the impeller air outlet 210 of the cooling impeller 10;

[0140] Enable the air flow to sequentially pass through the first air inlet 121, the cooling impeller 10, the interior of the rear end cover 120, and the rear housing flow passage 220 and enter the motor rotor flow passage 25 and the motor stator flow passage 230.

[0141] This is the structure of the magnetic levitation rotating machine of the present utility model on the axial side of the magnetic levitation bearing, including the structure of the rear end cover for intake air, the rear housing, the rear radial bearing, and the cooling impeller. It can, with the integral rotation of the rotor by the cooling impeller, suck gas from the first air inlet into the interior of the rear end cover and supply it to the motor rotor flow passage and the motor stator flow passage respectively through the rear housing flow passage, and then supply it to the magnetic levitation bearing, improving the air flow circulation path, increasing the heat dissipation area of the motor stator and rotor parts, and enhancing the cooling and heat dissipation performance.

[0142] In some embodiments,

[0143] It further includes a front radial bearing 17, a front housing 18, and a front end cover 20. The front radial bearing 17 and the front housing 18 are both located on the axial side of the magnetic levitation bearing away from the motor stator. There is a front radial bearing flow passage between the outer periphery of the front radial bearing 17 and the rotor 6, and a front housing flow passage between the outer periphery of the front housing 18 and the rotor 6. The front end cover 20 is arranged on the axial side of the cylinder body 19 away from the rear end cover 120, and a receiving space is formed at an interval between the front end cover 20 and the front housing 18;

[0144] A volute 31 is arranged on the outer periphery of the front end cover 20. A main impeller 30 is arranged at the other axial end of the rotor 6. The main impeller 30 is located within the volute 31. A second air inlet 311 is arranged at the central axis position of the volute 31. The second air inlet 311 faces the main impeller 30. There is a leakage channel 29 between the main impeller 30 and the front end cover 20, and a front end cover flow passage between the front end cover 20 and the outer periphery of the rotor 6.

[0145] Enable the second air inlet 311, the main impeller 30, the leakage channel 29, the front end cover flow passage, the receiving space, the front housing flow passage, the front radial bearing flow passage, and the air passage of the magnetic levitation bearing to be sequentially connected, and then exhaust through the bearing air outlet 26.

[0146] This is the structure of the magnetic levitation rotating machinery of the present utility model on the other axial side of the magnetic levitation bearing, including the main impeller for intake air, the front end cover, the front housing, the front radial bearing, etc. The structure can exchange heat for the front radial bearing and the magnetic levitation bearing with the gas inhaled by the main impeller. After the gas entering from the second air inlet exchanges heat with the magnetic bearing, it enters the magnetic bearing for heat exchange with a part of the gas passing through the motor rotor flow path from the first air inlet, and then converges and is discharged from the bearing air outlet, thus forming multiple flow paths for cooling and dissipating heat from the magnetic bearing and the motor, which can further improve the cooling and heat dissipation performance of the magnetic levitation machinery.

[0147] Figure 4 The cooling flow path scheme (preferably a blower, etc.) of the magnetic levitation rotating machinery of the present utility model is shown. An active pure air-cooled heat dissipation system is adopted. The cold air is provided by the leakage of the cooling impeller and the main impeller, without an additional heat dissipation drive motor. The main impeller 30 is assembled at the front end of the rotor, and the cooling impeller 10 is assembled at the rear end of the rotor. The rear radial bearing 14 is located between the cooling impeller 10 and the motor stator 15. The front radial bearing 17 and the axial bearing are respectively located between the main impeller 30 and the motor stator 15. A guide plate 11 for guiding the cooling impeller and a rear end cover 12 are assembled on the rear housing to increase the air flow conduction and reduce the flow resistance. Several corresponding ventilation holes or ventilation grooves are provided on parts such as the rear housing 13, the cylinder 19, the front housing 18, the radial bearing, and the axial bearing to facilitate the air flow conduction. The cooling gas is dissipated in three ways. The first way: it passes through the motor stator flow path 25 to cool the motor stator 15, and then converges at the axial magnetic bearing and passes through the bearing stator ventilation hole two 03' and the thrust disk Y-shaped inclined hole to cool the axial bearing and the thrust disk 3, and finally is discharged from the bearing air outlet 26 on the cylinder 19. The second way: it first cools the rear radial bearing 14, then passes through the motor rotor flow path 25 to cool the motor rotor and the stator, then passes through the bearing stator ventilation hole one 03 and the thrust disk Y-shaped inclined hole to cool the axial bearing and the thrust disk 3, and finally is discharged from the bearing air outlet 26 on the cylinder 19. The third way: the gas leaked from the main impeller 30 reaches the cavity area between the front housing 18 and the front end cover 20 through the back leakage flow path 29, cools the front radial bearing 17 after passing through the gap between the rotor 6 and the front housing 18, then passes through the bearing stator ventilation hole one 03 and the thrust disk Y-shaped inclined hole to cool the axial bearing and the thrust disk 3, and finally is discharged from the bearing air outlet 26 on the cylinder 19. With this flow path structure arrangement, the leakage of the main impeller and the air flow of the cooling impeller are utilized to effectively cool the heating components such as the motor stator, rotor, radial bearing, and axial bearing. At the same time, for the high-heating component, the thrust disk is provided with a Y-shaped inclined hole to suck out the hot air through the Y-shaped inclined hole flow path by negative pressure, realizing the effective ventilation and cooling of the overall heating components of the blower. The entire heat dissipation system has a simple structure, an efficient and reliable heat dissipation process, and improves the stability of the magnetic levitation system.

[0148] The beneficial effects of the present utility model are as follows:

[0149] 1. The utility model provides a structure with Y-shaped inclined holes arranged on the thrust disc for high-heat-generating components, and uses negative pressure to suck out heat through the flow channels of the Y-shaped inclined holes. Two inclined holes are drilled on both sides between the two magnetic poles of the thrust disc and converge in the middle, and then an inclined hole is drilled upward to the outer ring surface of the thrust disc. 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 disc, which can actively cool and accelerate its own heat dissipation, increase the cooling flow rate and does not affect the axial magnetic circuit.

[0150] 2. The 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 for 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.

[0151] The utility model also provides a magnetic levitation rotating machinery (preferably rotating machinery such as a motor, a blower, a ventilator or a compressor, etc.), which includes the aforementioned magnetic levitation bearing.

[0152] Figure 1 The internal axial bearing cooling path of the magnetic levitation rotating machinery (preferably a blower) of the utility model is shown. The three inclined holes, namely the first thrust disc air inlet hole 01 (inclined hole), the second thrust disc air inlet hole 02 (inclined hole), and the thrust disc air outlet hole 09 (inclined hole), form the Y-shaped inclined hole of the thrust disc. The air inlet of the Y-shaped hole of the thrust disc is located between the axial inner and outer magnetic poles opposite the coil, corresponding to the ventilation area of the wire groove. Ventilation grooves and ventilation holes are provided on the axial stator, and the ventilation holes communicate with the ventilation grooves. The ventilation grooves (the first and second gas flow paths) are in a radial, annular, spiral or other shapes. This cooling path is: the cooling gas passes through the bearing stator ventilation hole 03 (bearing stator ventilation hole 03') → the bearing stator ventilation groove 04 (bearing stator ventilation groove 04') → the first gas flow path 06 (the second gas flow path 08) → the first gap 05 (the fourth gap 07), and is collected from the first thrust disc air inlet hole 01 and the second thrust disc air inlet hole 02 on both sides of the thrust disc and discharged from the thrust disc air outlet hole 09, effectively dissipating heat from the axial stator and the axial winding. During operation, the intake direction of the first and the thrust disc intake inclined holes is opposite to the rotation direction of the rotor. The gas in the ventilation groove is sucked into the thrust disc inclined hole by negative pressure and then discharged for heat dissipation. Such a cooling path achieves an effective self-cooling effect. To make the thrust disc intake air under negative pressure, the intake direction needs to be always opposite to the rotation direction of the rotor. Therefore, the rotation direction of the thrust disc inclined hole is related to the intake direction of the thrust disc and the rotation direction of the rotor. If the left end of the thrust disc intakes air and the rotor rotates clockwise when viewed from the right end, the thrust disc has a right-handed inclined hole. If the left end of the thrust disc intakes air and the rotor rotates counterclockwise when viewed from the right end, it is a left-handed inclined hole. Vice versa. If the directions do not match, the heat dissipation effect will be weakened and the heat dissipation efficiency will be reduced.

[0153] 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, several improvements and modifications can be made without departing from the technical principle of the present utility model, and these improvements and modifications should also be regarded as the protection scope of the present utility model.

Claims

1. A magnetically suspended rotating machine, characterized in that: include: A magnetic bearing, a motor stator (15) and a rotor (6), wherein the motor stator (15) is located on the radial outer periphery of a portion of the shaft section of the rotor (6), a motor stator flow channel (230) is provided on the motor stator along the axial direction, a rotor air gap exists between the rotor (6) and the motor stator to form a motor rotor flow channel (25), and both the motor stator flow channel (230) and the motor rotor flow channel (25) can flow gas; the magnetic bearing is located on one axial side of the motor stator and can support the rotor (6); The magnetic bearing comprises an axial stator 1 (1), an axial stator 2 (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 (1) and the axial stator 2 (2); a thrust plate ventilation hole is arranged on the thrust plate (3) from one axial end surface to the other axial end surface; the axial stator 1 (1) comprises a radial outer portion 1 (11) and a radial inner portion 1 (12); the radial outer portion 1 (11) and the radial inner portion 1 (12) are arranged in a radial direction of the axial stator 1 (1) at intervals, and a coil slot 1 (13) is formed between the two, and a coil 1 (5) is arranged in the coil slot 1 (13); The thrust plate ventilation hole comprises a first thrust plate air inlet hole (01) extending from one axial end surface of the thrust plate (3) toward the interior of the thrust plate (3), and a second thrust plate air inlet hole (02) extending from the other axial end surface of the thrust plate (3) toward the interior of the thrust plate (3); one end of the first thrust plate air inlet hole (01) located inside the thrust plate (3) is connected with one end of the second thrust plate air inlet hole (02) located inside the thrust plate (3), and after being connected, it is connected to the outer periphery of the thrust plate (3) through the thrust plate air outlet hole (09); one end of the first thrust plate air inlet hole (01) located on one axial end surface of the thrust plate (3) is opposite to the position of the coil slot 1 (13) in the axial direction, and the one end of the first thrust plate air inlet hole (01) is not opposite to the magnetic pole position of the axial stator 1 (1); The axial stator (1) further comprises an axial outer portion (14), wherein the axial outer portion (14) is arranged in the axial direction of the magnetic bearing relative to the coil (5) and away from the thrust plate (3). A bearing stator ventilation hole (03) is provided on the axial outer side portion (14) of the axial stator (1), and the bearing stator ventilation hole (03) extends from one axial end surface of the axial outer side portion (14) to the other axial end surface, and the bearing stator ventilation hole (03) can be connected to the first thrust plate air inlet hole (01); the motor rotor flow channel (25) and the motor stator flow channel (230) can both be connected to the bearing stator ventilation hole (03).

2. The magnetic levitation rotating machine according to claim 1, characterized in that: Inside the coil slot 1 (13), a second gap is provided between the radial inner side of the coil 1 (5) and the radial inner side portion 1 (12), forming a first gas flow path (06). Inside the coil slot one (13), there is also a third gap between the axial outer side one (14) and the coil one (5), forming a bearing stator ventilation slot one (04); The bearing stator ventilation hole 1 (03) is connected to the bearing stator ventilation groove 1 (04), and is further connected to the first thrust plate air inlet hole (01) through the first gas flow path (06).

3. The magnetic levitation rotating machine according to claim 1, characterized in that: It also includes a cover plate (4), the cover plate (4) being located between the axial stator (1) and the thrust plate (3), and an axial end surface of the cover plate (4) being connected to the radial outer side portion (11) of the axial stator (1), and the other axial end surface of the cover plate (4) being opposite to the thrust plate (3); The magnetic pole position of the axial stator (1) includes a portion of the cover plate (4) opposite to the thrust disk (3) and a portion of the radial inner portion (12) opposite to the thrust disk (3); a first gap (05) is provided between the cover plate (4) and the radial inner portion (12); the first thrust disk air inlet hole (01) and the first gap (05) are opposite to each other in the axial direction, and a radial dimension of the first gap (05) is greater than or equal to a radial dimension of the first thrust disk air inlet hole (01).

4. The magnetic levitation rotating machine according to claim 3, characterized in that: In any radial cross section of the thrust disk (3), the cross-sectional area of ​​the magnetic path flow position of the axial stator one (1) = the radial cross-sectional area of ​​the thrust disk and the corresponding part of the axial stator one (1) - the cross-sectional area of ​​the thrust disk ventilation hole - the cross-sectional area of ​​the thrust disk air outlet hole (09) ≥ the cross-sectional area of ​​the magnetic pole position of the axial stator one (1).

5. The magnetic levitation rotating machine according to claim 1, characterized in that: Along the axial direction of the thrust plate (3), the first thrust plate air inlet hole (01) is an inclined hole structure whose extension direction is not parallel to the axis of the thrust plate (3); when observing from one axial end face of the thrust plate (3) toward the other axial end face thereof, the rotation direction of the thrust plate (3) is toward a first rotation direction; the extension direction of the first thrust plate air inlet hole (01) from one axial end face to the other axial end face is toward a second rotation direction, and the second rotation direction is opposite to the first rotation direction.

6. The magnetic levitation rotating machine according to claim 5, characterized in that: There are a plurality of first thrust plate air inlet holes (01), which are arranged at intervals along the circumferential direction of the thrust plate (3), and an extension direction of each first thrust plate air inlet hole (01) from one axial end face to the other axial end face is toward a second rotation direction, which is opposite to the first rotation direction of the thrust plate (3).

7. The magnetic levitation rotating machine according to claim 1, characterized in that: The axial stator 2 (2) comprises a radial outer portion 2 (21) and a radial inner portion 2 (22), wherein the radial outer portion 2 (21) and the radial inner portion 2 (22) are spaced apart in the radial direction of the axial stator 2 (2), and a coil slot 2 (23) is formed therebetween, a coil 2 (5') is arranged in the coil slot 2 (23), and the second thrust plate air inlet hole (02) is located at one end of the other axial end surface of the thrust plate (3) and is opposite to the position of the coil slot 2 (23) in the axial direction, and the one end of the second thrust plate air inlet hole (02) is not opposite to the magnetic pole position of the axial stator 2 (2); The second axial stator (2) further comprises a second axial outer portion (24), wherein the second axial outer portion (24) is arranged in the axial direction of the magnetic bearing relative to the second coil (5') and away from the thrust plate (3), A bearing stator ventilation hole 2 (03') is provided on the axial outer side 2 (24) of the axial stator 2 (2), and the bearing stator ventilation hole 2 (03') penetrates from one axial end surface of the axial outer side 2 (24) to the other axial end surface, and the bearing stator ventilation hole 2 (03') can be connected with the second thrust plate air inlet hole (02); The motor rotor flow channel (25) and the motor stator flow channel (230) can be respectively connected to the bearing stator ventilation hole 1 (03) or the bearing stator ventilation hole 2 (03').

8. The magnetic levitation rotating machine according to claim 7, characterized in that: Inside the coil slot 2 (23), a fifth gap is provided between the radial inner side of the coil 2 (5') and the radial inner portion 2 (22), forming a second gas flow path (08). Inside the coil slot 2 (23), there is also a sixth gap between the axial outer portion 2 (24) and the coil 2 (5'), forming a bearing stator ventilation slot 2 (04'); The bearing stator ventilation hole 2 (03') is connected to the bearing stator ventilation slot 2 (04'), and is further connected to the second thrust plate air inlet hole (02) through the second gas flow path (08).

9. The magnetic levitation rotating machine according to claim 7, characterized in that: It also includes a second cover plate (4'), the second cover plate (4') is located between the second axial stator (2) and the thrust plate (3), and one axial end surface of the second cover plate (4') is connected to the second radial outer portion (21) of the second axial stator (2), and the other axial end surface of the second cover plate (4') is opposite to the thrust plate (3); The magnetic pole position of the axial stator 2 (2) includes a portion of the cover plate 2 (4') opposite to the thrust plate (3), and a portion of the radial inner portion 2 (22) opposite to the thrust plate (3); a fourth gap (07) is provided between the cover plate 2 (4') and the radial inner portion 2 (22); the second thrust plate air inlet hole (02) and the fourth gap (07) are opposite to each other in the axial direction, and a radial dimension of the fourth gap (07) is greater than or equal to a radial dimension of the second thrust plate air inlet hole (02).

10. The magnetic levitation rotating machine according to claim 9, characterized in that: In each radial cross section of the thrust disk (3), the cross-sectional area of ​​the magnetic path flow position of the axial stator 2 (2) = the radial cross-sectional area of ​​the thrust disk and the corresponding part of the axial stator 2 (2) - the cross-sectional area of ​​the thrust disk ventilation hole - the cross-sectional area of ​​the thrust disk air outlet hole (09) ≥ the cross-sectional area of ​​the magnetic pole position of the axial stator 2 (2).

11. The magnetic levitation rotating machine according to claim 1, characterized in that: Along the axial direction of the thrust plate (3), the second thrust plate air inlet hole (02) is an inclined hole structure whose extension direction is not parallel to the axis of the thrust plate (3); when observing from the other axial end face of the thrust plate (3) toward one axial end face thereof, the rotation direction of the thrust plate (3) is toward a third rotation direction; the extension direction of the second thrust plate air inlet hole (02) from the other axial end face to the one axial end face is toward a fourth rotation direction, and the fourth rotation direction is opposite to the third rotation direction.

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

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

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

15. The magnetic levitation rotating machine according to claim 1, characterized in that: The outer periphery of the axial stator 1 (1) and the axial stator 2 (2) also has a cylinder (19), and a bearing air outlet (26) is also provided at a position of the cylinder (19) opposite to the thrust plate air outlet (09) of the thrust plate (3), which can be used to connect with the thrust plate air outlet (09) and exhaust air outwards.

16. The magnetic levitation rotating machine according to claim 15, characterized in that: It also includes a rear end cover (120), a cooling impeller (10), a rear casing (130) and a rear radial bearing (140), wherein the cooling impeller (10) is arranged at one axial end of the rotor (6) so as to rotate integrally with the rotor (6), the cooling impeller (10) is arranged inside the rear end cover (120), a first air inlet (121) axially penetrating the rear end cover (120) is arranged at a central axis position, the first air inlet (121) is directly opposite to the cooling impeller (10), and the magnetic suspension bearing and the motor stator are both located inside the cylinder (19); The rear housing (130) is axially connected between the rear end cover (120) and the barrel (19), and a rear housing flow channel (220) is axially arranged on the rear housing (130), one end of the rear housing flow channel (220) can be communicated with the motor rotor flow channel (25) and the motor stator flow channel (230) respectively, and the other end of the rear housing flow channel (220) can be communicated with the impeller air outlet (210) of the cooling impeller (10); The airflow is able to enter the motor rotor flow channel (25) and the motor stator flow channel (230) in sequence through the first air inlet (121), the cooling impeller (10), the interior of the rear end cover (120) and the rear casing flow channel (220).

17. The magnetic levitation rotating machine according to claim 16, characterized in that: It also includes a front radial bearing (17), a front housing (18) and a front end cover (20), wherein the front radial bearing (17) and the front housing (18) are both located on the axial side of the magnetic bearing away from the stator of the motor, a front radial bearing flow channel is provided between the front radial bearing (17) and the outer periphery of the rotor (6), a front housing flow channel is provided between the front housing (18) and the outer periphery of the rotor (6), the front end cover (20) is provided on the axial side of the cylinder (19) away from the rear end cover (120), and a storage space is formed between the front end cover (20) and the front housing (18); A volute (31) is provided on the outer periphery of the front end cover (20), a main impeller (30) is provided at the other axial end of the rotor (6), the main impeller (30) is located in the volute (31), a second air inlet (311) is provided at the central axis position of the volute (31), the second air inlet (311) is directly opposite to the main impeller (30), a leakage channel (29) is provided between the main impeller (30) and the front end cover (20), and a front end cover flow channel is provided between the front end cover (20) and the outer periphery of the rotor (6), The second air inlet (311), the main impeller (30), the leakage channel (29), the front cover flow channel, the accommodating space, the front casing flow channel, the front radial bearing flow channel and the air channel of the magnetic suspension bearing are connected in sequence, and then exhausted through the bearing air outlet (26).

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