Magnetic suspension rotating machine

Abstract

The utility model provides a magnetic suspension rotating machine which comprises a cylinder body, a magnetic suspension bearing, a motor stator and a rotor, the cylinder body is provided with a cylinder body flow channel, the rotor is also provided with a motor rotor flow channel, and in the axial direction, a thrust disc is arranged between a first axial stator and a second axial stator. Thrust disc ventilation holes are formed in the thrust disc from one axial end face to the other axial end face in a penetrating mode, the first axial stator comprises a first radial outer side part and a first radial inner side part, the first radial outer side part and the first radial inner side part are arranged in the radial direction of the first axial stator in a spaced mode, a first coil groove is formed between the first radial outer side part and the first radial inner side part, and a first coil is arranged in the first coil groove; the thrust disc ventilation holes are opposite to the first coil grooves in the axial direction, and the thrust disc ventilation holes are 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 blowers mainly relies on external cooling equipment, usually including external cooling fans, water cooling systems, heat exchangers, etc. The equipment maintenance cost is high, the structural system is complex, and potential safety hazards are increased. Or in the form of negative pressure, air is sucked from inside the blower to guide heat out, which cannot more effectively achieve the heat dissipation of internal components, especially the heat dissipation of axial magnetic bearings is insufficient, affecting the stable operation of magnetic levitation air compressors.

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

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

[0005] Therefore, the technical problem to be solved by the utility model is to overcome the defect of poor cooling and heat dissipation of the magnetic levitation 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 rotating machine, which includes:

[0007] A cylinder body, 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. The magnetic levitation bearing, the rotor and the motor stator are all located inside the cylinder body. The cylinder body is axially provided with a cylinder body flow channel. There is a rotor air gap between the part of the rotor opposite to the motor stator to form a motor rotor flow channel. Both the cylinder body 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 runs through the thrust disk from one axial end face to the other axial end face. The axial stator 1 includes a radially outer part 1 and a radially inner part 1. The radially outer part 1 and the radially inner part 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. The thrust disk ventilation hole is axially aligned with and communicates with the coil slot 1. The cylinder flow channel can communicate with the coil slot 1. And the thrust disk ventilation hole is not axially aligned with the magnetic pole position of the axial stator 1.

[0009] In some embodiments,

[0010] It further includes a pressing plate 1. The pressing plate 1 is located between the axial stator 1 and the thrust disk. One axial end face of the pressing plate 1 abuts against the radially outer part 1 of the axial stator 1, and the other axial end face of the pressing plate 1 faces the thrust disk.

[0011] The magnetic pole position of the axial stator 1 includes the part where the pressing plate 1 faces the thrust disk and the part where the radially inner part 1 faces the thrust disk. A first gap is formed between the pressing plate 1 and the radially inner part 1. The thrust disk ventilation hole is axially aligned with the first gap, and the dimension of the first gap in the radial direction is greater than or equal to the radial dimension of the thrust disk ventilation hole.

[0012] In some embodiments,

[0013] In any radial cross-section of the thrust disk, the cross-sectional area of the position where the magnetic circuit of the axial stator 1 passes through = the radial cross-sectional area of the part of the thrust disk facing the axial stator 1 - the cross-sectional area of the thrust disk ventilation hole ≥ the cross-sectional area of the magnetic pole position of the axial stator 1.

[0014] In some embodiments,

[0015] Inside the coil slot 1, a second gap is formed between the radially inner side of the coil 1 and the radially inner part 1, forming a first gas flow path.

[0016] The axial stator 1 further includes an axially outer part 1. The axially outer part 1 is disposed away from the thrust disk relative to the coil 1 in the axial direction of the magnetic levitation bearing. Inside the coil slot 1, a third gap is also formed between the axially outer part 1 and the coil 1, forming a bearing stator ventilation slot 1.

[0017] An axial bearing stator ventilation hole one is provided on the axial outer part one of the axial stator one. The axial bearing stator ventilation hole one penetrates from one axial end face of the axial outer part one to the other axial end face to communicate with the axial bearing stator ventilation groove one, and further communicates with the thrust disc ventilation hole through the first gas flow path;

[0018] The cylinder runner can communicate with the coil slot one through the axial bearing stator ventilation hole one.

[0019] In some embodiments,

[0020] Along the axial direction of the thrust disc, the thrust disc ventilation 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 end face of the intake side of the thrust disc towards the axial end face of the exhaust side, the rotation direction of the thrust disc is towards the first rotation direction, and the extending direction of the thrust disc ventilation hole from the axial end face of the intake side of the thrust disc towards the axial end face of the exhaust side is towards the second rotation direction, and the second rotation direction is opposite to the first rotation direction.

[0021] In some embodiments,

[0022] There are multiple thrust disc ventilation holes, and the multiple thrust disc ventilation holes are arranged at intervals along the circumferential direction of the thrust disc, and the extending direction of each thrust disc ventilation hole from the axial end face of the intake side of the thrust disc towards the axial end face of the exhaust side is towards the second rotation direction, and is opposite to the first rotation direction of the thrust disc.

[0023] In some embodiments,

[0024] The axial stator two includes a radial outer part two and a radial inner part two. The radial outer part two and the radial inner part two are arranged at intervals in the radial direction of the axial stator two, and a coil slot two is formed therebetween. A coil two is arranged in the coil slot two. The thrust disc ventilation hole is axially opposite to and communicates with the position of the coil slot two. The cylinder runner can communicate with the coil slot two through the coil slot one and the thrust disc ventilation hole in sequence; and the thrust disc ventilation hole is not opposite to the magnetic pole position of the axial stator two.

[0025] In some embodiments,

[0026] It further includes a pressing plate two. The pressing plate two is located between the axial stator two and the thrust disc, and one axial end face of the pressing plate two is connected to the radial outer part two of the axial stator two, and the other axial end face of the pressing plate two is opposite to the thrust disc;

[0027] The magnetic pole positions of the axial stator two include the part of the second pressing plate opposite to the thrust disk and the part of the second radially inner part opposite to the thrust disk. There is a fourth gap between the second pressing plate and the second radially inner part. The thrust disk ventilation hole is axially opposite to the fourth gap, and the dimension of the fourth gap in the radial direction is greater than or equal to the radial dimension of the thrust disk ventilation hole.

[0028] In some embodiments,

[0029] In each radial 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 magnetic pole position of the axial stator two.

[0030] In some embodiments,

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

[0032] The axial stator two further includes an axially outer part two. The axially outer part two is arranged away from the thrust disk relative to the second coil in the axial direction of the magnetic suspension bearing. Inside the second coil slot, there is also a sixth gap between the axially outer part two and the second coil, forming a bearing stator ventilation slot two.

[0033] The axially outer part two of the axial stator two is provided with a bearing stator ventilation hole two. The bearing stator ventilation hole two penetrates from one axial end face of the axially outer part two to the other axial end face to communicate with the bearing stator ventilation slot two, and further communicates with the thrust disk ventilation hole through the second gas flow path.

[0034] In some embodiments,

[0035] The thrust disk ventilation holes are formed in multiple rows in the radial direction, and the number of rows is N. The number of slots of the first coil slot is n, and N≥n≥1. Alternatively, the number of slots of the second coil slot (23) is n', and N≥n'≥1.

[0036] In some embodiments,

[0037] A thrust disk air passing hole is further provided on the thrust disk. The thrust disk air passing hole also penetrates from one axial end face of the thrust disk to the other axial end face, and the thrust disk air passing hole is located at a position opposite to the radially inner circumference of the first radially inner part. The thrust disk air passing hole is located outside the inner peripheral wall of the thrust disk and radially inside the thrust disk ventilation hole.

[0038] In some embodiments,

[0039] It further includes a rear end cover, a cooling impeller, a rear housing, a cylinder body 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. An axially penetrating air inlet is arranged at the central axis position of the rear end cover, and the air inlet faces the cooling impeller. Both the magnetic suspension bearing and the motor stator are located inside the cylinder body;

[0040] 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 cylinder body flow channel and the motor rotor flow channel, and the other end of the rear housing flow channel can be communicated with the impeller air outlet of the cooling impeller;

[0041] So that air flow can sequentially enter the cylinder body flow channel and the motor rotor flow channel through the air inlet, the cooling impeller, the inside of the rear end cover and the rear housing flow channel respectively.

[0042] In some embodiments,

[0043] 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 there is 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. A front housing channel is axially penetrated through the front housing. One end of the front housing channel is opposite to and communicated with the receiving space, and the other end is opposite to and communicated with the cylinder body flow channel;

[0044] An air outlet is further arranged on the cylinder body. The air outlet is located between the magnetic suspension bearing and the motor stator, so that air flow can sequentially pass through the cylinder body flow channel, the front housing channel, the receiving space, the front housing flow channel, the front radial bearing flow channel and the air duct of the magnetic suspension bearing and then converge with the air flow passing through the motor rotor flow channel, and then be discharged through the air outlet.

[0045] A magnetic suspension rotating machine provided by the present utility model has the following beneficial effects:

[0046] 1. The utility model realizes self - active air suction and heat exchange through the thrust - plate ventilation holes opened on the thrust plate. By means of high rotation speed, it increases the gas flow rate introduced, accelerates the cooling of the axial magnetic bearing, can actively cool the thrust plate itself and increase the cooling flow rate to accelerate the heat dissipation of the axial coil, improves the cooling and heat - dissipation effect on the magnetic levitation bearing, and makes the thrust - plate ventilation holes not opposite to the pole positions of the axial stator 1. This can prevent the thrust - plate end face from being perforated at the position directly facing the pole, so that the cooling air cannot directly reach the pole gap position, effectively avoiding the influence of the cooling gas and the holes on the magnetic furnace structure, thus avoiding insufficient magnetic levitation axial support force. While improving the heat dissipation and cooling of the magnetic levitation bearing, it can also avoid affecting the magnetic levitation magnetic circuit, ensure sufficient magnetic levitation support force, and effectively reduce the influence of gas force on the axial force. The utility model also preferably sets the thrust - plate ventilation holes at the position corresponding to the coil between the upper and lower axial poles, and the aperture size ≤ the radial distance between the upper and lower poles of the axial stator, which can further effectively avoid the pole positions, further avoid affecting the magnetic circuit, and the thrust - plate 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 plate small and the fluidity good;

[0047] The invention also sets a cylinder flow channel on the cylinder body and an electric - motor rotor flow channel on the rotor, enabling the cooling gas at the air inlet to enter from the rear housing and be divided into two paths. One path is through the cylinder body, and the other path is through the electric - motor rotor. The cooling gas in the cylinder body can cool the stator and the magnetic levitation bearing respectively on the outer periphery of the stator and the outer periphery of the magnetic levitation bearing, and further flows out through the thrust - plate inclined holes + axial - bearing stator ventilation holes, mixes with the air flow passing through the electric - motor rotor flow channel and is discharged, further increasing the air - flow area, and further improving the cooling and heat - dissipation efficiency and performance of the magnetic levitation machine.

[0048] 2. The present utility model further sets a relationship within any radial cross-section of the thrust disc, i.e., the cross-sectional area of the magnetic circuit flowing 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 magnetic pole position of the axial stator 1, so that other magnetic circuit parts on the thrust disc 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 magnetic levitation supporting force; the present utility model also sets the ventilation holes of the thrust disc 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 holes and ventilation grooves (multiple gas flow paths) in the axial stator coil slots, the gas flow in the cavity of the axial stator coil slots can be further accelerated, realizing the effective independent heat dissipation of the axial coil and the thrust disc. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 FIG. is a longitudinal sectional view of Embodiment 1 of the magnetic levitation bearing of the magnetic levitation rotating machine of the present utility model;

[0050] Figure 2 is Figure 1 the plan structure diagram of the thrust disc structure in (showing the thrust disc ventilation holes with right-handed inclined holes);

[0051] Figure 3 FIG. is a longitudinal sectional view of Embodiment 2 of the magnetic levitation bearing of the present utility model;

[0052] Figure 4 is Figure 3 the plan structure diagram of the thrust disc structure in (showing the thrust disc ventilation holes with left-handed inclined holes);

[0053] Figure 5 FIG. is a three-dimensional structure diagram of the axial stator 1 of the present utility model;

[0054] Figure 6 FIG. is a longitudinal sectional view of the magnetic levitation rotating machine of the present invention.

[0055] The reference numerals are shown as:

[0056] 1. Axial stator 1; 11. Radial outer part 1; 12. Radial inner part 1; 13. Coil slot 1; 14. Axial outer part 1; 2. Axial stator 2; 21. Radial outer part 2; 22. Radial inner part 2; 23. Coil slot 2; 24. Axial outer part 2; 3. Thrust disc; 4. Pressing plate 1; 4'. Pressing plate 2; 5. Coil 1; 5'. Coil 2; 6. Rotor; 10. Cooling impeller; 110. Deflector; 120. Rear end cover; 121. 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. Cylinder flow channel; 240. Motor rotor flow channel; 25. Front housing channel; 26. Air outlet;

[0057] 01. Thrust disc ventilation 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. First gap; 06. First gas flow path; 07. Fourth gap; 08. Second gas flow path. Detailed implementation mode

[0058] 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.

[0059] It should be noted that the terms used herein are only for describing the specific implementation mode and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or their combinations.

[0060] 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, the said technologies, methods, and devices should be regarded as part of the authorization specification. In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0061] In the description of the present utility model, it should be understood that the orientation or positional relationships indicated by orientation terms 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 terms do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus cannot be construed as limiting the protection scope of the present utility model; the orientation terms "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0062] For the convenience of description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "above", etc., can be used here to describe the spatial positional relationships of a device or feature shown in the drawings with other devices or features. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation described in the drawings for the device. For example, if the device in the drawing is inverted, the device described as "above other devices or structures" or "over other devices or structures" will then be positioned "below other devices or structures" or "under other devices or structures". Thus, the exemplary term "above..." can include both the 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.

[0063] In addition, it should be noted that the use of words such as "first", "second", etc. to limit components is only for the convenience of distinguishing the corresponding components. Without otherwise stating, the above words have no special meanings, and thus cannot be construed as limiting the protection scope of the present utility model.

[0064] AsFigures 1-6 As shown in the figure, the present utility model provides a magnetic levitation rotating machine, which includes:

[0065] A cylinder body 19, a magnetic levitation bearing, a motor stator and a rotor 6. The motor stator is located on the radial outer periphery of a partial shaft section of the rotor 6. The magnetic levitation bearing, the rotor 6 and the motor stator are all located inside the cylinder body 19. A cylinder body flow channel 230 is axially formed on the cylinder body 19. A rotor air gap exists in a part of the rotor 6 opposite to the motor stator to form a motor rotor flow channel 240. Both the cylinder body flow channel 230 and the motor rotor flow channel 240 can conduct gas; the magnetic levitation bearing is located on one axial side of the motor stator and can support the rotor 6;

[0066] The magnetic levitation bearing includes an axial stator one 1, an axial stator two 2 and a thrust disc 3. In the axial direction of the magnetic levitation bearing, the thrust disc 3 is arranged between the axial stator one 1 and the axial stator two 2. A thrust disc ventilation hole 01 is penetrated through the thrust disc 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. The thrust disc ventilation hole 01 is axially opposite to and communicated with the position of the coil slot one 13. The cylinder body flow channel 230 can be communicated with the coil slot one 13; and the thrust disc ventilation hole 01 is not opposite to the magnetic pole position of the axial stator one 1.

[0067] By means of the thrust disc ventilation hole formed on the thrust disc, the present utility model realizes self-actuated air suction and heat exchange through high rotational speed, increases the gas flow rate introduced, accelerates the cooling of the axial magnetic bearing, can actively cool the thrust disc itself and increase the cooling flow rate to accelerate the heat dissipation of the axial coil, improves the cooling and heat dissipation effect of the magnetic levitation bearing, and makes the thrust disc ventilation hole not opposite to the magnetic pole position of the axial stator one, so that no hole is formed at the position of the thrust disc end face facing the magnetic pole, and the cooling air cannot directly reach the magnetic pole gap position, which can effectively avoid the influence of the cooling gas and the opening on the magnetic furnace structure, thereby avoiding insufficient magnetic levitation axial supporting force, realizing the improvement of the heat dissipation and cooling of the magnetic levitation bearing while avoiding the influence on the magnetic levitation magnetic circuit, ensuring sufficient magnetic levitation supporting force, and effectively reducing the influence of the gas acting force on the axial force;

[0068] The present invention also arranges a cylinder runner on the cylinder body and an electric motor rotor runner on the rotor, enabling the cooling gas at the air inlet to enter from the rear housing and be divided into two paths. One path is through the cylinder body, and the other is through the electric motor rotor. The cooling gas in the cylinder body can cool the stator and the magnetic suspension bearing respectively on the outer periphery of the stator and the outer periphery of the magnetic suspension bearing, and further flows out through the inclined holes in the thrust disk + the ventilation holes of the axial bearing stator, and is discharged after being mixed with the air flow passing through the electric motor rotor runner, further increasing the air flow area and further improving the cooling and heat dissipation efficiency and performance of the magnetic suspension machine.

[0069] In some embodiments,

[0070] 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 outer radial 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.

[0071] The magnetic pole positions of the first axial stator 1 include the part where the first pressing plate 4 faces the thrust disk 3 and the part where the first inner radial part 12 faces the thrust disk 3. There is a first gap 05 between the first pressing plate 4 and the first inner radial part 12. The thrust disk ventilation hole 01 and the first gap 05 are opposite in the axial direction, and the dimension of the first gap 05 in the radial direction is greater than or equal to the radial dimension of the thrust disk ventilation hole 01.

[0072] The present utility model preferably arranges the thrust disk ventilation holes 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 positions by the thrust disk 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.

[0073] In some embodiments,

[0074] In any radial cross-section of the thrust disk 3, the cross-sectional area of the position where the magnetic circuit of the first axial stator 1 flows through = the radial cross-sectional area of the part of the thrust disk opposite to the first axial stator 1 - the cross-sectional area of the thrust disk ventilation hole 01 ≥ the cross-sectional area of the magnetic pole position of the first axial stator 1.

[0075] The present utility model further sets a relationship in any radial cross-section of the thrust disc: 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 thrust disc ventilation hole ≥ 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 have magnetic field saturation prior to the magnetic pole position, ensuring the formation of a normal magnetic flux loop and ensuring the continuous and effective provision of the magnetic levitation supporting force.

[0076] In some embodiments,

[0077] Inside the coil slot 13 of the first axial stator, a second gap is formed between the radially inner side of the first coil 5 and the first radially inner part 12, forming a first gas flow path 06.

[0078] The first axial stator 1 further includes a first axially outer part 14, which is arranged away from the thrust disc 3 relative to the first coil 5 in the axial direction of the magnetic levitation bearing. Inside the coil slot 13 of the first axial stator, a third gap is also formed between the first axially outer part 14 and the first coil 5, forming a first bearing stator ventilation slot 04.

[0079] A first bearing stator ventilation hole 03 is provided on the first axially outer part 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 part 14 to the other axial end face to communicate with the first bearing stator ventilation slot 04, and further communicates with the thrust disc ventilation hole 01 through the first gas flow path 06.

[0080] The cylinder flow channel 230 can communicate with the coil slot 13 of the first axial stator through the first bearing stator ventilation hole 03.

[0081] The present utility model can further accelerate the gas flow in the cavity of the axial stator coil slot through the bearing stator ventilation holes and ventilation slots (multiple gas flow paths) provided in the axial stator coil slot, realizing the effective self-cooling of the axial coil and the thrust disc; and the cylinder flow channel of the present invention dissipates heat from the outer periphery of the magnetic levitation bearing, and for the inside of the magnetic levitation bearing, it can provide a larger flow of gas to the coil slot, further improving the cooling and heat dissipation efficiency of the inside of the magnetic levitation bearing.

[0082] In some embodiments,

[0083] Along the axial direction of the thrust disk 3, the thrust disk ventilation hole 01 is an inclined hole structure whose extending direction is not parallel to the axis of the thrust disk 3. From the observation direction of the axial end face on the air inlet side of the thrust disk 3 towards the axial end face on the air outlet side, the rotation direction of the thrust disk 3 is the first rotation direction, and the extending direction of the thrust disk ventilation hole 01 from the axial end face on the air inlet side of the thrust disk towards the axial end face on the air outlet side is towards the second rotation direction, and the second rotation direction is opposite to the first rotation direction.

[0084] The utility model also sets the thrust disk ventilation hole to extend from the axial end face on the air inlet side towards the axial end face on the air outlet side in the second rotation direction, and the second rotation direction is opposite to the first rotation direction (the rotation direction of the thrust disk). When the rotor drives the thrust disk to rotate at a high speed, negative pressure can be generated to suck out the hot air at one end and discharge it to the outside, increasing the flow rate of the introduced gas, realizing the active ventilation and heat exchange of the thrust disk itself, accelerating the gas flow, saving energy consumption, and improving the heat dissipation performance while also improving the energy efficiency.

[0085] In some embodiments,

[0086] There are multiple thrust disk ventilation holes 01, and the multiple thrust disk ventilation holes 01 are arranged at intervals along the circumferential direction of the thrust disk 3. Moreover, the extending direction of each thrust disk ventilation hole 01 from the axial end face on the air inlet side towards the axial end face on the air outlet side is towards the second rotation direction, and all are opposite to the first rotation direction of the thrust disk 3.

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

[0088] In some embodiments,

[0089] The axial stator two 2 includes a radially outer part two 21 and a radially inner part two 22. The radially outer part two 21 and the radially inner part two 22 are spaced apart in the radial direction of the axial stator two 2, and a coil slot two 23 is formed therebetween. A coil two 5' is disposed in the coil slot two 23. The thrust disk ventilation hole 01 is axially opposite to and communicated with the position of the coil slot two 23. The cylinder flow channel 230 is communicated with the coil slot two 23 through the coil slot one 13 and the thrust disk ventilation hole 01 in sequence; and the thrust disk ventilation hole 01 is not opposite to the magnetic pole position of the axial stator two 2.

[0090] In the present utility model, by further making the thrust disk ventilation hole not opposite to the magnetic pole position of the axial stator two, it can be ensured that no hole is formed at the position of the thrust disk end face facing the magnetic pole position of the axial stator two, so that the cooling air cannot directly reach the magnetic pole gap position of the axial stator two. It can further effectively avoid the influence of the cooling gas and the opening on the magnetic furnace structure, further avoid insufficient magnetic levitation axial supporting force, further realize improving the heat dissipation and cooling of the magnetic levitation bearing while avoiding the influence on the magnetic levitation magnetic circuit, further improve the magnetic levitation supporting force, and effectively reduce the influence of the gas acting force on the axial force; and the cylinder flow channel and the motor rotor flow channel provide two paths for the heat dissipation gas to flow through, and can respectively provide cooling gas for the outer periphery (and the inside) of the motor rotor and the magnetic levitation bearing for heat dissipation, with a wider cooling and heat dissipation area, and further improve the cooling and heat dissipation efficiency of the inside of the motor stator.

[0091] In some embodiments,

[0092] It further includes a pressing plate two 4'. The pressing plate two 4' is located between the axial stator two 2 and the thrust disk 3. One axial end face of the pressing plate two 4' is connected to the radially outer part two 21 of the axial stator two 2, and the other axial end face of the pressing plate two 4' is opposite to the thrust disk 3.

[0093] The magnetic pole position of the axial stator two 2 includes the part where the pressing plate two 4' is opposite to the thrust disk 3 and the part where the radially inner part two 22 is opposite to the thrust disk 3. There is a fourth gap 07 between the pressing plate two 4' and the radially inner part two 22. The thrust disk ventilation hole 01 is axially opposite to the fourth gap 07, and the dimension of the fourth gap 07 in the radial direction is greater than or equal to the radial dimension of the thrust disk ventilation hole 01.

[0094] In some embodiments,

[0095] 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 2 - the cross-sectional area of the thrust disk ventilation hole 01 ≥ the cross-sectional area of the magnetic pole position of the axial stator two 2.

[0096] The present utility model further sets the thrust disk ventilation holes between the upper and lower magnetic poles of the axial stator II and opposite to the coil, and further makes the aperture size of the thrust disk ventilation holes ≤ the radial distance between the upper and lower magnetic poles of the axial stator II, which can further effectively avoid the magnetic pole positions of the axial stator II, further avoid affecting the magnetic circuit, and the 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.

[0097] In some embodiments,

[0098] Inside the coil slot II 23, there is a fifth gap between the radial inner side of the coil II 5' and the radial inner part II 22, forming a second gas flow path 08.

[0099] The axial stator II 2 further includes an axial outer part II 24, and the axial outer part II 24 is arranged away from the thrust disk 3 relative to the coil II 5' in the axial direction of the magnetic suspension bearing. Inside the coil slot II 23, there is also a sixth gap between the axial outer part II 24 and the coil II 5', forming a bearing stator ventilation slot II 04'.

[0100] A bearing stator ventilation hole II 03' is provided on the axial outer part II 24 of the axial stator II 2, and the bearing stator ventilation hole II 03' penetrates from one axial end face of the axial outer part II 24 to the other axial end face to communicate with the bearing stator ventilation slot II 04', and further communicates with the thrust disk ventilation hole 01 through the second gas flow path 08.

[0101] The present utility model further can further accelerate the gas flow in the cavity of the coil slot of the axial stator II by arranging bearing stator ventilation holes and ventilation slots (multiple gas flow paths) in the coil slot of the axial stator II, and realize the effective independent heat dissipation of the axial coil and the thrust disk.

[0102] In some embodiments,

[0103] The thrust disk ventilation holes 01 are formed in multiple rows in the radial direction, the number of rows is N, the number of slots of the coil slot I 13 is n, and N≥n≥1, or the number of slots of the coil slot II 23 is n', and N≥n'≥1.

[0104] The axial magnetic bearing of the present utility model preferably adopts active ventilation cooling. The thrust disk is installed on the rotor. There are inclined holes between the two magnetic poles of the thrust disk, and several inclined holes are arranged circumferentially on the thrust disk. 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 gas flow rate. Active ventilation heat exchange of the thrust disk itself is realized, accelerating the gas flow. At the same time, it cooperates with the ventilation holes and ventilation grooves in the axial stator coil slots to accelerate the gas flow in the cavity of the axial stator coil slots, realizing effective independent heat dissipation of the axial coil and the thrust disk. Assume that the number of coil slots is n, and the number of rows of inclined holes in the radial direction is N. The number of rows of inclined holes N of the thrust disk is N≥1, and preferably the number of rows of inclined holes N≥n.

[0105] According to the principle of the axial magnetic suspension bearing, the relative position between 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, which can reduce the influence of gas force on the axial force. 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 magnetic circuit flow position ≥ the cross-sectional area of the magnetic pole position. If the opening position of the thrust disk is within the magnetic circuit, in any radial section, the cross-sectional area of the magnetic circuit flow position = the radial circumferential cross-sectional area of the relative part of the thrust disk and the bearing stator - the cross-sectional area of the thrust disk ventilation hole ≥ the cross-sectional area of the magnetic pole position. It is preferably located at the position directly opposite to the coil between the upper and lower axial magnetic poles. The aperture size ≤ the radial spacing between the upper and lower axial magnetic poles of the stator, and is connected to the ventilation paths at both ends without obstruction. The air flow resistance at both ends of the thrust disk is small and the fluidity is good.

[0106] In some embodiments,

[0107] A thrust disk air passing hole (not shown) is further provided on the thrust disk 3. The thrust disk air passing hole also penetrates from one axial end face of the thrust disk 3 to the other axial end face, and the thrust disk air passing hole is located at a position opposite to the radial inner circumference of the radial inner part 12. The thrust disk air passing hole is located outside the inner circumferential wall of the thrust disk 3 and radially inside the thrust disk ventilation hole 01.

[0108] The present utility model can further increase the flow area and flow rate of the air flow passing through the thrust disk by providing a thrust disk air passing hole at the position between the thrust disk located inside the axial stator and the rotor, enabling the thrust disk to be further cooled and dissipated, and further improving the cooling and heat dissipation performance and cooling effect of the thrust disk, rotor and axial stator.

[0109] For the heat dissipation of the entire system of the present utility model, an active pure air-cooled heat dissipation system is preferably adopted. The cold air is driven by a coaxial impeller at the other end of the main impeller, or enters through centrifugal intake during the rotation of the rotor, or leaks in through the main impeller. No additional heat dissipation drive motor is required. The flow rate of the cold air for heat dissipation is adjusted by the motor speed, and no additional controller is needed. With the overall internal flow channel layout, the cold air is directed to each component for targeted heat dissipation. The entire heat dissipation system has a simple structure and an efficient and reliable heat dissipation process.

[0110] In some embodiments,

[0111] It further includes a rear end cover 120, a cooling impeller 10, a rear housing 130, a cylinder 19, and a rear radial bearing 140. The cooling impeller 10 is disposed at one axial end of the rotor 6 so as to rotate integrally with the rotor 6. The cooling impeller 10 is disposed inside the rear end cover 120. An axially penetrating air inlet 121 is provided at the central axis position of the rear end cover 120, and the air inlet 121 faces the cooling impeller 10. Both the magnetic levitation bearing and the motor stator are located inside the cylinder 19;

[0112] 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 cylinder flow channel 230 and the motor rotor flow channel 240, 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;

[0113] So that the air flow can successively enter the cylinder flow channel 230 and the motor rotor flow channel through the air inlet 121, the cooling impeller 10, the inside of the rear end cover 120, and the rear housing flow channel 220 respectively.

[0114] This is the structure of the magnetic levitation rotating machine of the present invention on the axial side of the magnetic levitation bearing, including the structure of the rear end cover for intake, the rear housing, the rear radial bearing, and the cooling impeller. It can, through the integral rotation of the cooling impeller with the rotor, suck in gas from the air inlet into the inside of the rear end cover, and supply it to the cylinder flow channel and the motor rotor flow channel respectively through the rear housing flow channel, improving the air flow circulation path, increasing the heat dissipation area for the cylinder and the rotor parts, and enhancing the cooling and heat dissipation performance.

[0115] In some embodiments,

[0116] It further includes a front radial bearing 17, a front housing 18 and a front end cover 20. Both the front radial bearing 17 and the front housing 18 are located on the axial side of the magnetic suspension 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 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. A front housing passage 25 is axially penetrated through the front housing 18. One end of the front housing passage 25 faces and communicates with the receiving space, and the other end faces and communicates with the cylinder flow passage 230.

[0117] An air outlet 26 is further arranged on the cylinder 19. The air outlet 26 is located between the magnetic suspension bearing and the motor stator 15, so that the air flow can sequentially pass through the cylinder flow passage 230, the front housing passage 25, the receiving space, the front housing flow passage, the front radial bearing flow passage and the air passage of the magnetic suspension bearing, and then converge with the air flow passing through the motor rotor flow passage 240, and then be discharged through the air outlet 26.

[0118] This is the structure on the other axial side of the magnetic suspension bearing of the magnetic suspension rotary machine of the present invention, including the structure of the front end cover for intake air, the front housing, the front radial bearing, etc. It can introduce the gas cooled by the cylinder flow passage for the stator and the magnetic suspension bearing into the interior of the magnetic suspension bearing through the front housing and the front radial bearing for heat exchange with the magnetic suspension bearing, and after heat exchange, mix with the gas heat-exchanged through the motor rotor flow passage, and be discharged out of the cylinder together through the air outlet, improving the cooling and heat dissipation performance.

[0119] Figure 6The cooling flow path scheme of the magnetic levitation rotating machine of the present invention is shown (preferably a blower, etc.). An active pure air-cooling system is adopted. The cold air is provided by the cooling impeller, and no additional heat dissipation drive motor is required. The cooling impeller 10 is assembled at the rear end of the rotor. The rear radial bearing 140 is located between the cooling impeller 10 and the motor stator 15. The front end is placed on the front radial bearing 17. The magnetic levitation axial bearing is located between the front radial bearing 17 and the motor stator 15. A guide plate 110 for guiding the cooling impeller and a rear end cover 120 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 130, the cylinder 19, the front housing 18, and the magnetic levitation axial bearing to facilitate the air flow conduction. The cooling gas at the impeller air outlet 210 is divided into two paths through the rear housing flow path 220 on the rear housing 130 to cool the rear radial bearing 140. The first path: passes through the cylinder flow path 230 → the front housing channel 25 → the front radial bearing 17, and then passes through the axial stator slot ventilation hole (bearing stator ventilation hole 03), the bearing stator ventilation groove 04, and the corresponding thrust plate right-handed inclined hole (thrust plate ventilation hole 01) at the axial magnetic bearing, and then is discharged through the ventilation at the other end slot to cool the motor stator, the front radial bearing, and the axial bearing; The second path: is discharged through the motor rotor flow path 240 to cool the motor rotor. The two paths of gas are collected and discharged from the cylinder 19 through the air outlet 26. This flow path structure arrangement effectively cools the heat-generating components such as the stator, rotor, radial bearing, and axial bearing. At the same time, for the high-heat-generating component, the thrust plate with inclined holes, the hot air is sucked out through the inclined hole flow path by using negative pressure, realizing the effective ventilation and cooling of the overall heat-generating components of the blower. The entire heat dissipation system has a simple structure, and the heat dissipation process is efficient and reliable, improving the stability of the magnetic levitation system.

[0120] The beneficial effects of the present utility model are as follows:

[0121] 1. In the present utility model, inclined holes are provided on the thrust plate for high-heat-generating components and are matched with the axial coil ventilation grooves. The heat is sucked out through the inclined hole flow path by using negative pressure, which can actively cool the thrust plate itself and increase the cooling flow rate to accelerate the heat dissipation of the axial coil. The active pure air-cooling system reduces the heat dissipation cost, and the targeted ventilation of the heat-generating components can effectively accelerate the cooling and improve the reliability;

[0122] 2. The present utility model also cooperates with the overall flow path structure arrangement of the machine, and conducts targeted ventilation and heat dissipation on the heat-generating components, realizing the effective ventilation and cooling of the overall heat-generating components of the blower, and improving the stability of the magnetic levitation system; realizing an integrated high-efficiency pure air-cooling system, which can ensure that the blower has sufficient heat dissipation air volume under various working conditions. The cold air is directly driven by the motor rotor, the control logic is simple, and the heat dissipation system has high reliability.

[0123] The present utility model also provides a magnetic levitation rotating machine (preferably a rotating machine such as a motor, a blower, a ventilator, or a compressor, etc.), which includes the aforementioned magnetic levitation bearing.

[0124] Figure 1 and Figure 3 The following shows the internal axial bearing cooling path of the magnetic levitation machine (preferably a blower) of the present invention. Bearing stator ventilation holes are provided on both the axial stator one and two. Bearing stator ventilation grooves are provided in the coil slots, preferably in a radial, annular, spiral or other shape. Oblique holes (thrust disc ventilation holes 01) are provided on the thrust disc 3. The thrust disc oblique holes are located at the position opposite the coil between the axial inner and outer magnetic poles, corresponding to the ventilation position of the wire grooves. This cooling path passes from the bearing stator ventilation hole one 03 through the bearing stator ventilation groove one 04, the inner circle of the axial coil, between the axial inner and outer magnetic poles, then through the thrust disc oblique holes, between the axial inner and outer magnetic poles, the inner circle of the axial coil, the bearing stator ventilation groove two 04' and finally discharges from the bearing stator ventilation hole two 03'. During operation, the intake direction of the thrust disc oblique holes is opposite to the rotation direction of the rotor. The thrust disc uses negative pressure to suck out the heat dissipation gas, increasing the gas flow rate, accelerating the heat exchange between the thrust disc and the axial coil, and cooperating with the overall cooling path of the scheme to achieve an effective heat dissipation effect. To make the thrust disc intake air with 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 oblique holes is related to the intake direction of the thrust disc and the rotation direction of the rotor. If the rotor rotates clockwise when viewed from the right end when the left end of the thrust disc intakes air, the thrust disc has right-handed oblique holes. If the rotor rotates counterclockwise when viewed from the right end when the left end of the thrust disc intakes air, it has left-handed oblique holes. Vice versa. If the directions do not match, the heat dissipation effect will be weakened and the heat dissipation efficiency will be reduced.

[0125] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. The above is only the preferred implementation manner of the present invention. 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 invention, several improvements and modifications can still be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A magnetic levitation rotating machine, characterized in that: Comprising: A cylinder body (19), a magnetic levitation bearing, a motor stator, and a rotor (6). The motor stator is located on the radially outer periphery of a partial shaft section of the rotor (6). The magnetic levitation bearing, the rotor (6), and the motor stator are all located inside the cylinder body (19). A cylinder body flow channel (230) is axially formed on the cylinder body (19). A rotor air gap exists in a part of the rotor (6) opposite to the motor stator to form a motor rotor flow channel (240). Both the cylinder body flow channel (230) and the motor rotor flow channel (240) can conduct gas. The magnetic levitation bearing is located on one axial side of the motor stator and can support the rotor (6). 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 (01) runs 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 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). The thrust disk ventilation hole (01) is axially opposite to and communicated with the coil slot one (13). The cylinder body flow channel (230) can be communicated with the coil slot one (13). And the thrust disk ventilation hole (01) is not axially opposite to the magnetic pole position of the axial stator one (1).

2. The magnetic levitation rotating machine according to claim 1, wherein: It further includes a pressing plate one (4). The pressing plate one (4) is located between the axial stator one (1) and the thrust disk (3). One axial end face of the pressing plate one (4) is in contact with the radially outer part one (11) of the axial stator one (1), and the other axial end face of the pressing plate one (4) faces the thrust disk (3). The magnetic pole position of the axial stator one (1) includes the part of the pressing plate one (4) facing the thrust disk (3) and the part of the radially inner part one (12) facing the thrust disk (3). A first gap (05) exists between the pressing plate one (4) and the radially inner part one (12). The thrust disk ventilation hole (01) is axially opposite to the first gap (05), and the dimension of the first gap (05) in the radial direction is greater than or equal to the radial dimension of the thrust disk ventilation hole (01).

3. The magnetic levitation rotating machine according to claim 2, wherein: In any radial cross-section of the thrust disk (3), the cross-sectional area of the magnetic path flowing position of the axial stator one (1) = the radial cross-sectional area of the part of the thrust disk opposite to the axial stator one (1) - the cross-sectional area of the thrust disk ventilation hole (01) ≥ the cross-sectional area of the magnetic pole position of the axial stator one (1).

4. The magnetic levitation rotating machine according to claim 1, wherein: Inside the coil slot 1 (13), a second gap is formed between the radial inner side of the coil 1 (5) and the radial inner part 1 (12), forming a first gas flow path (06). The axial stator 1 further includes an axial outer part 1 (14). The axial outer part 1 (14) is arranged away from the thrust disk (3) relative to the coil 1 (5) in the axial direction of the magnetic levitation bearing. Inside the coil slot 1 (13), a third gap is also formed between the axial outer part 1 (14) and the coil 1 (5), forming a bearing stator ventilation slot 1 (04). A bearing stator ventilation hole 1 (03) is provided on the axial outer part 1 (14) of the axial stator 1. The bearing stator ventilation hole 1 (03) penetrates from one axial end face of the axial outer part 1 (14) to the other axial end face to communicate with the bearing stator ventilation slot 1 (04), and further communicates with the thrust disk ventilation hole (01) through the first gas flow path (06). The cylinder flow channel (230) can communicate with the coil slot 1 (13) through the bearing stator ventilation hole 1 (03).

5. The magnetic levitation rotating machine according to claim 1, wherein: Along the axial direction of the thrust disk (3), the thrust disk ventilation hole (01) has an inclined hole structure whose extension direction is not parallel to the axis of the thrust disk (3). From the observation direction of the axial end face of the intake side of the thrust disk (3) towards the axial end face of the exhaust side, the rotation direction of the thrust disk (3) is the first rotation direction, and the extension direction of the thrust disk ventilation hole (01) from the axial end face of the intake side of the thrust disk (3) towards the axial end face of the exhaust side is the 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, wherein: There are multiple thrust disk ventilation holes (01). The multiple thrust disk ventilation holes (01) are arranged at intervals along the circumferential direction of the thrust disk (3), and the extension direction of each thrust disk ventilation hole (01) from the axial end face of the intake side of the thrust disk towards the axial end face of the exhaust side is the second rotation direction, all opposite to the first rotation direction of the thrust disk (3).

7. The magnetic levitation rotating machine according to claim 1, wherein: 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 thrust disk ventilation hole (01) is axially opposite to and communicated with the position of the coil slot two (23). The cylinder flow passage (230) is communicated with the coil slot two (23) through the coil slot one (13) and the thrust disk ventilation hole (01) in sequence. And the thrust disk ventilation hole (01) is not opposite to the magnetic pole position of the axial stator two (2).

8. The magnetic levitation rotating machine according to claim 7, characterized in that: It further includes a pressing plate two (4'). The pressing plate two (4') is located between the axial stator two (2) and the thrust disk (3). An axial end face of the pressing plate two (4') is in contact with the radially outer part two (21) of the axial stator two (2), and the other axial end face of the pressing plate two (4') is opposite to the thrust disk (3). The magnetic pole position of the axial stator two (2) includes the part where the pressing plate two (4') is opposite to the thrust disk (3) and the part where the radially inner part two (22) is opposite to the thrust disk (3). There is a fourth gap (07) between the pressing plate two (4') and the radially inner part two (22). The thrust disk ventilation hole (01) is axially opposite to the fourth gap (07), and the dimension of the fourth gap (07) in the radial direction is greater than or equal to the radial dimension of the thrust disk ventilation hole (01).

9. The magnetic levitation rotating machine according to claim 8, characterized in that: 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 (2) - the cross-sectional area of the thrust disk ventilation hole (01) ≥ the cross-sectional area of the magnetic pole position of the axial stator two (2).

10. The magnetic levitation rotating machine according to claim 7, characterized in that: Inside the coil slot two (23), there is a fifth gap between the radially inner side of the coil two (5') and the radially inner part two (22), forming a second gas flow path (08). 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 coil two (5') in the axial direction of the magnetic levitation bearing. Inside the coil slot two (23), there is also a sixth gap between the axially outer part two (24) and the coil two (5'), forming a bearing stator ventilation slot two (04'). On the outer axial part two (24) of the axial stator two (2), there is a bearing stator ventilation hole two (03'), and the bearing stator ventilation hole two (03') penetrates from one axial end face of the outer axial part two (24) to the other axial end face to communicate with the bearing stator ventilation groove two (04'), and further communicates with the thrust disc ventilation hole (01) through the second gas flow path (08).

11. The magnetic levitation rotating machine according to claim 7, characterized in that: The thrust disc ventilation holes (01) are formed in multiple rows in the radial direction, the number of rows is N, the number of slots of the coil slot one (13) is n, and N≥n≥1, or the number of slots of the coil slot two (23) is n', and N≥n'≥1.

12. The magnetic levitation rotating machine according to claim 1, characterized in that: On the thrust disc (3), there is also a thrust disc air passing hole, and the thrust disc air passing hole also penetrates from one axial end face of the thrust disc (3) to the other axial end face, and the thrust disc air passing hole is located at a position opposite to the inner radial circumference of the inner radial part one (12), and the thrust disc air passing hole is located outside the inner peripheral wall of the thrust disc (3) and radially inside the thrust disc ventilation hole (01).

13. The magnetic levitation rotating machine according to claim 1, characterized in that: It further includes a rear end cover (120), a cooling impeller (10), a rear housing (130), a cylinder (19) and a rear radial bearing (140). The cooling impeller (10) is arranged at one axial end of the rotor (6) to be able to rotate integrally with the rotor (6). The cooling impeller (10) is arranged inside the rear end cover (120). An axially penetrating air inlet (121) is provided at the central axis position of the rear end cover (120), and the air inlet (121) faces the cooling impeller (10). The magnetic levitation 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 cylinder (19), and a rear housing flow path (220) is axially provided on the rear housing (130). One end of the rear housing flow path (220) can communicate with the cylinder flow path (230) and the motor rotor flow path (240) respectively, and the other end of the rear housing flow path (220) can communicate with the impeller air outlet (210) of the cooling impeller (10); ​ ​ 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 suspension bearing away from the motor stator. There is a front radial bearing flow passage between the front radial bearing (17) and the outer periphery of the rotor (6), and a front housing flow passage between the front housing (18) and the outer periphery of 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). A front housing passage (25) is axially penetrated through the front housing (18). One end of the front housing passage (25) is opposite to and communicated with the receiving space, and the other end is opposite to and communicated with the cylinder body flow passage (230); An air outlet (26) is further arranged on the cylinder body (19). The air outlet (26) is located between the magnetic suspension bearing and the motor stator (15), so that the air flow can sequentially pass through the cylinder body flow passage (230), the front housing passage (25), the receiving space, the front housing flow passage, the front radial bearing flow passage and the air passage of the magnetic suspension bearing, and then converge with the air flow passing through the motor rotor flow passage (240), and then be discharged through the air outlet (26).

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