Magnetic suspension rotating machine

Abstract

The utility model provides a magnetic suspension rotating machine which comprises a magnetic suspension bearing, a motor stator and a motor rotor. In the axial direction, the thrust disc is arranged between the first axial stator and the second axial stator, a first thrust disc ventilation hole is formed in the thrust disc in a penetrating mode from one axial end face to the other axial end face of the thrust disc, and the first axial stator comprises a first radial outer side part and a first radial inner side part. One end, positioned on the other axial end surface of the thrust disc, of each first thrust disc vent hole is positioned between the radial inner side part II of the axial stator II and the rotor, and the other end, positioned on the axial end surface of the thrust disc, of each first thrust disc vent hole is opposite to the position of the coil slot I in the axial direction; the first thrust disc vent hole is not opposite to the magnetic pole position of the first axial stator; and air flows discharged from the motor stator and rotor flow channels and the first thrust disc ventilation holes are integrally discharged. 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 Technique

[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. This results in high equipment maintenance costs, complex structural systems, and increased safety hazards. 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 enables the axial movement of the rotating shaft. Therefore, a thrust disk, which is an essential axial force-bearing component, is required on the rotating shaft. 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, 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 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 effects 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 effects 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 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 provided on the motor stator. A rotor air gap exists between the rotor and 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.

[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 first 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 axial stator 2 includes a radially outer portion 2 and a radially inner portion 2,

[0010] One end of the first thrust disk ventilation hole located on the other axial end face of the thrust disk is located between the radially inner portion 2 of the axial stator 2 and the rotor. One end of the first thrust disk ventilation hole located on the one axial end face of the thrust disk is axially opposite to the position of the coil slot 1, and the first thrust disk ventilation hole is not axially opposite to the magnetic pole position of the axial stator 1;

[0011] The air flow flowing out of the motor rotor flow channel, the air flow flowing out of the motor stator flow channel, and the air flow flowing out of the first thrust disk ventilation hole can all be discharged through the air outlet.

[0012] In some embodiments,

[0013] 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 is in contact with the radially outer portion 1 of the axial stator 1, and the other axial end face of the pressing plate 1 faces the thrust disk;

[0014] The magnetic path flowing position cross-sectional area of the axial stator 1 includes the portion of the pressing plate 1 facing the thrust disk and the portion of the radially inner portion 1 facing the thrust disk. There is a first gap between the pressing plate 1 and the radially inner portion 1. The first thrust disk ventilation hole is axially opposite to 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 end of the first thrust disk ventilation hole opposite to the coil slot 1.

[0015] In some embodiments,

[0016] In any radial cross-section of the thrust disk, the cross-sectional area of the magnetic path flowing position of the axial stator 1 = the radial cross-sectional area of the portion of the thrust disk opposite to the axial stator 1 - the cross-sectional area of the first thrust disk ventilation hole ≥ the cross-sectional area of the magnetic pole position of the axial stator 1.

[0017] In some embodiments,

[0018] Inside the coil slot 1, there is a second gap between the radially inner side of the coil 1 and the radially inner part 1, forming a first gas flow path.

[0019] The axial stator 1 further includes an axially outer part 1, which is arranged away from the thrust disc relative to the coil 1 in the axial direction of the magnetic suspension bearing. Inside the coil slot 1, there is also a third gap between the axially outer part 1 and the coil 1, forming a bearing stator ventilation slot 1.

[0020] On the axially outer part 1 of the axial stator 1, there is a bearing stator ventilation hole 1, which penetrates from one axial end face of the axially outer part 1 to the other axial end face to communicate with the bearing stator ventilation slot 1, and further communicates with the first thrust disc ventilation hole through the first gas flow path.

[0021] The air outlet can be communicated with the bearing stator ventilation hole 1 through the first thrust disc ventilation hole.

[0022] In some embodiments,

[0023] Along the axial direction of the thrust disc, the first 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 outlet side, the rotation direction of the thrust disc is the first rotation direction, and the extending direction of the first thrust disc ventilation hole from the axial end face of the intake side of the thrust disc towards the axial end face of the outlet side is towards the second rotation direction, and the second rotation direction is opposite to the first rotation direction.

[0024] In some embodiments,

[0025] There are multiple first thrust disc ventilation holes, and the multiple first thrust disc ventilation holes are arranged at intervals along the circumferential direction of the thrust disc, and the extending direction of each first thrust disc ventilation hole from the axial end face of the intake side of the thrust disc towards the axial end face of the outlet side is towards the second rotation direction, and is opposite to the first rotation direction of the thrust disc.

[0026] In some embodiments,

[0027] A second thrust disc ventilation hole is penetrated through the thrust disc from its axial other end face to the axial one end face, and the second thrust disc ventilation hole is misaligned and not communicated with the first thrust disc ventilation hole.

[0028] The second radially outer part and the second radially inner part 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. One end of the second thrust plate ventilation hole located on the axial end face of the thrust plate is located between the first radially inner part of the axial stator one and the rotor. One end of the second thrust plate ventilation hole located on the other axial end face of the thrust plate is axially opposite to the position of the coil slot two, and the second thrust plate ventilation hole is not opposite to the magnetic pole position of the axial stator two;

[0029] The air outlet can also communicate with the second thrust plate ventilation hole.

[0030] In some embodiments,

[0031] It further includes a second pressing plate. The second pressing plate is located between the axial stator two and the thrust plate, and one axial end face of the second pressing plate is connected to the second radially outer part of the axial stator two, and the other axial end face of the second pressing plate faces the thrust plate;

[0032] The magnetic pole position of the axial stator two includes the part where the second pressing plate faces the thrust plate and the part where the second radially inner part faces the thrust plate. There is a fourth gap between the second pressing plate and the second radially inner part. The second thrust plate ventilation 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 end of the second thrust plate ventilation hole opposite to the coil slot two.

[0033] In some embodiments,

[0034] In each radial section of the thrust plate, the cross-sectional area of the position where the magnetic circuit of the axial stator two flows through = the radial cross-sectional area of the part of the thrust plate opposite to the axial stator two - the cross-sectional area of the second thrust plate ventilation hole ≥ the cross-sectional area of the magnetic pole position of the axial stator two.

[0035] In some embodiments,

[0036] Inside the coil slot two, there is a fifth gap between the radially inner side of the coil two and the second radially inner part, forming a second gas flow path,

[0037] The axial stator two further includes an axially outer part two. The axially outer part two is arranged away from the thrust plate relative to the coil two in the axial direction of the magnetic suspension bearing. Inside the coil slot two, there is also a sixth gap between the axially outer part two and the coil two, forming a bearing stator ventilation slot two;

[0038] On the outer axial part two of the axial stator two, there are bearing stator ventilation holes two, and the bearing stator ventilation holes two penetrate from one axial end face of the outer axial part two to the other axial end face to communicate with the bearing stator ventilation grooves two, and further communicate with the second thrust disk ventilation holes through the second gas flow path;

[0039] The air outlet communicates with the second thrust disk ventilation holes through the bearing stator ventilation holes two.

[0040] In some embodiments,

[0041] Along the axial direction of the thrust disk, the second thrust disk ventilation holes are inclined hole structures whose extension directions are not parallel to the axis of the thrust disk. From the observation direction from the axial end face on the air inlet side of the thrust disk to the axial end face on the air outlet side, the rotation direction of the thrust disk is the third rotation direction, and the extension direction of the second thrust disk ventilation holes from the axial end face on the air inlet side of the thrust disk to the axial end face on the air outlet side is the fourth rotation direction, and the fourth rotation direction is opposite to the third rotation direction.

[0042] In some embodiments,

[0043] There are multiple second thrust disk ventilation holes, and the multiple second thrust disk ventilation holes are arranged at intervals along the circumferential direction of the thrust disk, and the extension direction of each second thrust disk ventilation hole from the axial end face on the air inlet side of the thrust disk to the axial end face on the air outlet side is the fourth rotation direction, and is opposite to the third rotation direction of the thrust disk.

[0044] In some embodiments,

[0045] It further includes a cylinder body, 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. There is an axially penetrating first air inlet at the central axis position of the rear end cover, and the first air inlet faces the cooling impeller. The magnetic suspension bearing, the rotor (6) and the motor stator are all located inside the cylinder body;

[0046] The rear housing is provided with a rear housing flow channel along the axial direction. One end of the rear housing flow channel can communicate with the motor rotor flow channel and the motor stator flow channel respectively, and the other end of the rear housing flow channel can communicate with the impeller air outlet of the cooling impeller;

[0047] So that the air flow can enter the motor rotor flow channel and the motor stator flow channel respectively through the first air inlet, the cooling impeller, the inside of the rear end cover and the rear housing flow channel in sequence.

[0048] In some embodiments,

[0049] 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 levitation 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 away from the rear end cover, and a receiving space is formed at an interval between the front end cover and the front housing;

[0050] 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 is directly opposite to 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.

[0051] 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 passage of the magnetic levitation bearing are communicated in sequence;

[0052] An air outlet is penetratively arranged on the inner and outer peripheral walls of the cylinder. The air outlet is axially located between the magnetic levitation bearing and the motor stator, so that the motor stator flow channel, the motor rotor flow channel or the air passage of the magnetic levitation bearing is communicated with the air outlet.

[0053] A magnetic levitation rotating machine provided by the utility model has the following beneficial effects:

[0054] 1. The utility model realizes self-activating air suction and heat exchange through the first and / or second thrust disc ventilation holes opened on the thrust disc. By means of high rotational speed, it 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 on the magnetic suspension bearing. And one end of the first thrust disc ventilation hole opposite to the coil slot 1 is not opposite to the magnetic pole position of the axial stator 1 (one end of the second thrust disc ventilation hole is not opposite to the magnetic pole position of the axial stator 2), which can make no holes on the thrust disc end face facing the magnetic pole position, so that the cooling air cannot directly reach the magnetic pole gap position, can effectively avoid the influence of the cooling gas and the holes on the magnetic furnace structure, thus avoiding insufficient magnetic suspension axial support force, realizing improving the heat dissipation and cooling of the magnetic suspension bearing while avoiding the influence on the magnetic suspension magnetic circuit, ensuring sufficient magnetic suspension support force, and effectively reducing the influence of the gas acting force on the axial force; The utility model also preferably extends the first thrust disc ventilation hole from one end of the thrust disc located between the axial stator and the rotor to the other end of the thrust disc opposite to the coil slot 1, which can cool and dissipate the heat of the coil inside the stator, and the aperture size of the end opposite to the coil slot 1 ≤ the radial distance between the upper and lower magnetic poles of the axial stator, which can make the thrust disc ventilation hole further effectively avoid the magnetic pole position, further avoid the influence on the magnetic circuit, and the thrust disc ventilation hole is connected with the ventilation paths at both ends without obstruction, and can also make the air flow resistance at both ends of the thrust disc small and the fluidity good;

[0055] The utility model also forms two air inlet paths: the air inlet of the heat dissipation impeller + the leakage of the blower impeller. The first path of the leaked gas of the blower impeller passes through the front radial bearing and the magnetic suspension axial bearing (the inclined hole of the thrust disc + the ventilation hole of the axial bearing stator). The second path is that the cooling gas from the air inlet of the rear end cover enters the motor rotor flow path and the motor stator flow path respectively through the cooling impeller, and then converges with the gas that has cooled the magnetic suspension bearing and exits from the motor air outlet, increasing the air flow path for the magnetic suspension bearing, the motor stator and the motor rotor, and further improving the cooling and heat dissipation efficiency and performance of the magnetic suspension machine.

[0056] 2. The present utility model further sets up a relationship within any radial cross-section of the thrust disk, i.e., the cross-sectional area of the magnetic circuit flow-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 first thrust disk ventilation hole ≥ 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 have 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 thrust disk ventilation 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 disk). When the rotor drives the thrust disk to rotate at high speed, negative pressure can be generated to suck out hot air at one end and discharge it to the outside, increasing the inflow gas volume, realizing the active ventilation and heat exchange of the thrust disk 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 disk. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] Figure 1 is a longitudinal sectional view of Embodiment 1 of the magnetic levitation bearing of the present utility model;

[0058] Figure 2 is Figure 1 the plan view of the thrust disk structure in

[0059] Figure 3 is a longitudinal sectional view of Embodiment 2 of the magnetic levitation bearing of the present utility model;

[0060] Figure 4 is Figure 3 the plan view of the thrust disk structure in

[0061] Figure 5 is a three-dimensional structure diagram of the axial stator 1 of the present utility model;

[0062] Figure 6 is a longitudinal sectional view of the magnetic levitation rotating machinery of the present utility model.

[0063] The reference numerals are shown as:

[0064] 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 disk; 4. Pressing plate 1; 4'. Pressing plate 2; 5. Coil 1; 5'. Coil 2; 6. Rotor; 7. Main impeller; 8. Volute; 81. Second air inlet; 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; 240. Motor rotor flow channel; 25. Leakage channel; 26. Air outlet;

[0065] 01. First thrust disk ventilation hole; 02. Second thrust disk 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

[0066] 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 constitutes a limitation on 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 shall fall within the protection scope of the present invention.

[0067] It should be noted that the terms used here are only for describing the specific implementation mode and are not intended to limit the exemplary embodiments according to the present application. As used here, unless otherwise clearly specified in the context, 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 combinations thereof.

[0068] 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 of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the 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, further discussion thereof is not required in subsequent drawings.

[0069] 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" 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 should not be construed as limiting the protection scope of the present utility model; the orientation terms "inner, outer" refer to the inside and outside relative to the contour of each component itself.

[0070] For the convenience of description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "above" can be used here to describe the spatial positional relationships of one device or feature to other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted 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 of the spatial relative descriptions used here will be made.

[0071] In addition, it should be noted that the use of words such as "first", "second" 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.

[0072] AsFigures 1-6 As shown in the figure, the present utility model provides a magnetic levitation rotating machine, which includes:

[0073] A magnetic levitation bearing, a motor stator 15 and a rotor 6. The motor stator 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 15. A rotor air gap exists between the rotor 6 and the motor stator to form a motor rotor flow channel 240. Both the motor stator 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.

[0074] 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 first 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 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 axial stator two 2 includes a radial outer part two 21 and a radial inner part two 22.

[0075] One end of the first thrust disk ventilation hole 01 located on the other axial end face of the thrust disk 3 is located between the radial inner part two 22 of the axial stator two 2 and the rotor 6. One end of the first thrust disk ventilation hole 01 located on the one axial end face of the thrust disk 3 is axially opposite to the position of the coil slot one 13, and the first thrust disk ventilation hole 01 is not opposite to the magnetic pole position of the axial stator one 1.

[0076] The air flow flowing out of the motor rotor flow channel 240, the air flow flowing out of the motor stator flow channel 230 and the air flow flowing out of the first thrust disk ventilation hole 01 can all be discharged through an air outlet 26 (preferably, the three are integrally converged and then discharged through the air outlet integrally).

[0077] The utility model realizes self - active air suction and heat exchange through the first 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 of the magnetic levitation bearing, and makes one end of the first thrust - plate ventilation hole opposite to the coil slot 1 not opposite to the magnetic pole position of the axial stator 1. This can prevent the thrust - plate end face from punching holes at the position directly opposite to the magnetic pole, so that the cooling air cannot directly reach the magnetic - pole gap position, effectively avoiding the influence of the cooling gas and the opening on the magnetic furnace structure, thus avoiding insufficient magnetic levitation axial supporting force, realizing improved heat dissipation and cooling of the magnetic levitation bearing while avoiding influencing the magnetic levitation magnetic circuit, ensuring sufficient magnetic levitation supporting force, and effectively reducing the influence of gas force on the axial force;

[0078] The utility model also forms two - way air inlets: heat - dissipation impeller air intake + blower - impeller leakage. The first - way blower - impeller leakage gas passes through the front radial bearing and the magnetic levitation axial bearing (thrust - plate inclined holes + axial - bearing stator ventilation holes). The second - way cooling gas enters the motor - rotor flow path and the motor - stator flow path from the cooling impeller through the air - inlet of the rear end - cover, and then converges with the gas that has cooled the magnetic levitation bearing and exits from the motor air - outlet. This increases the air - flow circulation path for the magnetic levitation bearing, the motor stator, and the motor rotor, further improving the cooling and heat - dissipation efficiency and performance of the magnetic levitation machinery.

[0079] In some embodiments,

[0080] It further includes a first pressing plate 4. The first pressing plate 4 is located between the axial stator 1 and the thrust plate 3. One axial end - face of the first pressing plate 4 is in contact with the outer - radial part 11 of the axial stator 1, and the other axial end - face of the first pressing plate 4 faces the thrust plate 3;

[0081] The magnetic - pole position of the axial stator 1 includes the part of the first pressing plate 4 opposite to the thrust plate 3 and the part of the inner - radial part 12 opposite to the thrust plate 3. There is a first gap 05 between the first pressing plate 4 and the inner - radial part 12. The first thrust - plate ventilation hole 01 is axially opposite to the first gap 05, and the radial - direction dimension of the first gap 05 is greater than or equal to the radial dimension of the end of the first thrust - plate ventilation hole 01 opposite to the coil slot 13.

[0082] The ventilation holes of the first thrust disk of the present utility model extend from one end of the thrust disk at the position between the axial stator and the rotor to the other end of the thrust disk opposite to the first coil slot, which can cool and dissipate the heat of the coil inside the stator. Moreover, the end of the first thrust disk ventilation hole opposite to the first coil slot is preferably arranged 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 by the first thrust disk ventilation hole, further avoid affecting the magnetic circuit, and the first 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.

[0083] In some embodiments,

[0084] 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 first thrust disk ventilation hole 01 ≥ the cross-sectional area of the magnetic pole position of the first axial stator 1.

[0085] The present utility model further sets, in any radial cross-section of the thrust disk, the relationship: the cross-sectional area of the position where the magnetic circuit of the first axial stator flows through = the radial cross-sectional area of the part of the thrust disk opposite to the first axial stator - the cross-sectional area of the first thrust disk ventilation hole ≥ the cross-sectional area of the magnetic pole position of the first axial stator, 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 circuit and ensuring the continuous and effective provision of the magnetic levitation supporting force.

[0086] In some embodiments,

[0087] Inside the first coil slot 13, there is a second gap between the radial inner side of the first coil 5 and the first radial inner part 12, forming a first gas flow path 06.

[0088] The first axial stator 1 further includes a first axial outer part 14, and the first axial outer part 14 is arranged away from the thrust disk 3 relative to the first coil 5 in the axial direction of the magnetic levitation bearing. Inside the first coil slot 13, there is also a third gap between the first axial outer part 14 and the first coil 5, forming a first bearing stator ventilation slot 04.

[0089] A first bearing stator ventilation hole 03 is arranged on the first axial outer part 14 of the first axial stator 1, and the first bearing stator ventilation hole 03 penetrates from one axial end face of the first axial outer part 14 to the other axial end face to communicate with the first bearing stator ventilation slot 04, and further communicates with the first thrust disk ventilation hole 01 through the first gas flow path 06.

[0090] The air outlet 26 communicates with the first bearing stator ventilation hole 03 through the first thrust plate ventilation hole 01.

[0091] Furthermore, in the present utility model, by providing bearing stator ventilation holes and ventilation grooves (multiple gas flow paths) in the axial stator coil slots, the air outlet communicates with the first bearing stator ventilation hole through the first thrust plate ventilation hole, effectively cooling and dissipating heat inside the bearing, further accelerating the gas flow in the cavity of the axial stator coil slots, and achieving effective independent heat dissipation of the axial coil and the thrust plate.

[0092] In some embodiments,

[0093] Along the axial direction of the thrust plate 3, the first thrust plate ventilation hole 01 is an inclined hole structure whose extension direction is not parallel to the axis of the thrust plate 3. From the observation direction of the axial end face on the air inlet side of the thrust plate 3 towards the axial end face on the air outlet side, the rotation direction of the thrust plate 3 is the first rotation direction, and the extension direction of the first thrust plate ventilation hole 01 from the axial end face on the air inlet side of the thrust plate towards the axial end face on the air outlet side is the second rotation direction, and the second rotation direction is opposite to the first rotation direction.

[0094] In the present utility model, by setting the first thrust plate ventilation hole so that its extension direction from the axial end face on the air inlet side towards the axial end face on the air outlet side is the second rotation direction, and the second rotation direction is opposite to the first rotation direction (the rotation direction of the thrust plate), when the rotor drives the thrust plate to rotate at 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 plate itself, accelerating the gas flow, saving energy consumption, and improving the heat dissipation performance and energy efficiency at the same time.

[0095] In some embodiments,

[0096] There are multiple first thrust plate ventilation holes 01, and the multiple first thrust plate ventilation holes 01 are arranged at intervals along the circumferential direction of the thrust plate 3. Moreover, the extension direction of each first thrust plate ventilation hole 01 from the axial end face on the air inlet side towards the axial end face on the air outlet side is the second rotation direction, all opposite to the first rotation direction of the thrust plate 3.

[0097] The present utility model provides a magnetically levitated rotating machine (preferably a blower) with active and efficient heat dissipation. The first thrust disk ventilation holes adopt an inclined hole solution to achieve self-priming air heat exchange through high rotational speed, increasing the gas flow rate, accelerating the cooling of the axial magnetic bearing, and at the same time cooperating with the overall active pure air cooling of the blower. The coaxial impeller at the other end of the main impeller is used for cooling, or the negative pressure of the rotor rotation is used for cooling, or the leakage of the main impeller is used for cooling. It changes 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.

[0098] In some embodiments,

[0099] A second thrust disk ventilation hole 02 is provided through the thrust disk 3 from its axial other end face to the axial one end face, and the second thrust disk ventilation hole 02 is offset and not communicated with the first thrust disk ventilation hole 01;

[0100] The outer radial part two 21 and the inner radial 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 arranged in the coil slot two 23. One end of the second thrust disk ventilation hole 02 located on the axial one end face of the thrust disk 3 is located between the inner radial part one 12 of the axial stator one 1 and the rotor 6. One end of the second thrust disk ventilation hole 02 located on the axial other end face of the thrust disk 3 is axially opposite to the position of the coil slot two 23, and the second thrust disk ventilation hole 02 is not opposite to the magnetic pole position of the axial stator two 2;

[0101] The air outlet 26 can also be communicated with the second thrust disk ventilation hole 02.

[0102] The present utility model further makes the end of the second thrust disk ventilation hole opposite to the coil slot two not opposite to the magnetic pole position of the axial stator two, so that no hole is drilled at the position of the thrust disk end face facing the magnetic pole position of the axial stator two, and the cooling air cannot directly reach the magnetic pole gap position of the axial stator two, which can further effectively avoid the influence of the cooling gas and the opening on the magnetic furnace structure, further avoid the insufficient magnetic levitation axial supporting force, further realize 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 can also effectively reduce the influence of the gas force on the axial force;

[0103] Moreover, the first and second bearing stator ventilation holes and the first and second thrust disc ventilation holes of the present utility model are respectively communicated with the air outlet, and can provide two paths (X-shaped heat exchange flow channels) for the gas flow channels for cooling the magnetic levitation bearing, further improving the cooling and heat dissipation efficiency of the magnetic levitation bearing.

[0104] In some embodiments,

[0105] It further includes a second pressing plate 4', the second pressing plate 4' is located between the second axial stator 2 and the thrust disc 3, and one axial end face of the second pressing plate 4' is in contact with the second outer radial part 21 of the second axial stator 2, and the other axial end face of the second pressing plate 4' faces the thrust disc 3;

[0106] The magnetic pole positions of the second axial stator 2 include the part where the second pressing plate 4' faces the thrust disc 3 and the part where the second inner radial part 22 faces the thrust disc 3. There is a fourth gap 07 between the second pressing plate 4' and the second inner radial part 22. The second thrust disc ventilation hole 02 is axially opposite to the fourth gap 07, and the radial dimension of the fourth gap 07 is greater than or equal to the radial dimension of the second thrust disc ventilation hole 02 and one end of the coil slot 23.

[0107] The second thrust disc ventilation hole of the present utility model extends from one end of the thrust disc at the position between the axial stator and the rotor to the other end of the thrust disc opposite to the coil slot 1, and can cool and dissipate heat from the coil inside the stator. Moreover, the end of the second thrust disc ventilation hole opposite to the coil slot 2 is preferably arranged 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 second thrust disc ventilation hole, further avoid affecting the magnetic circuit, and the second thrust disc ventilation hole is connected to the ventilation paths at both ends without obstruction, and can also make the air flow resistance at both ends of the thrust disc small and the fluidity good.

[0108] In some embodiments,

[0109] In each radial section of the thrust disc 3, the cross-sectional area of the magnetic path flowing position of the second axial stator 2 = the radial cross-sectional area of the part of the thrust disc opposite to the second axial stator 2 - the cross-sectional area of the second thrust disc ventilation hole 02 ≥ the cross-sectional area of the magnetic pole position of the second axial stator 2.

[0110] In the present utility model, further, one end of the second thrust disk ventilation hole opposite to the coil slot 2 is disposed between the upper and lower magnetic poles of the axial stator 2 and is positioned right opposite to the coil, such that the aperture size of this end of the second thrust disk ventilation hole ≤ the radial spacing between the upper and lower magnetic poles of the axial stator 2, which can further effectively avoid the magnetic pole positions of the axial stator 2 by the second thrust disk ventilation hole, further prevent the influence on the magnetic circuit, and the second thrust disk ventilation hole is connected to the ventilation paths at both ends without obstruction, which can also result in small air flow resistance and good fluidity at both ends of the thrust disk.

[0111] In some embodiments,

[0112] Inside the coil slot 23, there is a fifth gap between the radial inner side of the coil 5' and the radial inner side part 22, forming a second gas flow path 08.

[0113] The axial stator 2 further includes an axial outer side part 24, the axial outer side part 24 is disposed away from the thrust disk 3 relative to the coil 5' in the axial direction of the magnetic suspension bearing, and inside the coil slot 23, there is also a sixth gap between the axial outer side part 24 and the coil 5', forming a bearing stator ventilation slot 04'.

[0114] A bearing stator ventilation hole 03' is provided on the axial outer side part 24 of the axial stator 2, and the bearing stator ventilation hole 03' penetrates from one axial end face of the axial outer side part 24 to the other axial end face to communicate with the bearing stator ventilation slot 04', and further communicates with the second thrust disk ventilation hole 02 through the second gas flow path 08.

[0115] The air outlet 26 communicates with the second thrust disk ventilation hole 02 through the bearing stator ventilation hole 03'.

[0116] In the present utility model, further, by providing bearing stator ventilation holes and ventilation slots (multiple gas flow paths) in the coil slot of the axial stator 2, the air outlet communicates with the second thrust disk ventilation hole through the bearing stator ventilation hole 03', realizing effective cooling and heat dissipation inside the bearing, and forming two gas flow channels (X-shaped heat exchange flow channels) for heat dissipation of the magnetic suspension bearing, which can further accelerate the gas flow in the cavity of the coil slot of the axial stator 2 and realize effective independent heat dissipation of the axial coil and the thrust disk.

[0117] In some embodiments,

[0118] Along the axial direction of the thrust disc 3, the second thrust disc ventilation hole 02 is an inclined hole structure whose extension direction is not parallel to the axis of the thrust disc 3. From the observation direction of the axial end face on the air inlet side of the thrust disc 3 towards the axial end face on the air outlet side, the rotation direction of the thrust disc 3 is the third rotation direction, and the extension direction of the second thrust disc ventilation hole 02 from the axial end face on the air inlet side of the thrust disc 3 towards the axial end face on the air outlet side is the fourth rotation direction, and the fourth rotation direction is opposite to the third rotation direction.

[0119] The present utility model also sets the first thrust disc ventilation hole so that its extension direction from the axial end face on the air inlet side towards the axial end face on the air outlet side is the third rotation direction (which can be the same as or opposite to the first 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.

[0120] In some embodiments,

[0121] There are multiple second thrust disc ventilation holes 02, and the multiple second thrust disc ventilation holes 02 are arranged at intervals along the circumferential direction of the thrust disc 3. Moreover, the extension direction of each second thrust disc ventilation hole 02 from the axial end face on the air inlet side of the thrust disc towards the axial end face on the air outlet side is the fourth rotation direction, and all are opposite to the third rotation direction of the thrust disc 3.

[0122] The present utility model provides a magnetically levitated rotating machine (preferably a blower) with active and efficient heat dissipation. The second thrust disc ventilation hole adopts an inclined hole scheme to achieve self - active air suction and heat exchange through high - speed rotation, 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 scheme 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.

[0123] The axial magnetic bearing of the present utility model adopts active ventilation cooling. The thrust disc is installed on the rotor, with inclined holes between the two magnetic poles of the thrust disc. Several misaligned X-shaped inclined holes are provided on the thrust disc, which are arranged from the inside to the outside and from the outside to the inside in the axial and radial spaces (for cooling the thrust disc in cooperation with the overall machine scheme, only one intake inclined hole can also be provided for axial cooling). The intake direction is opposite to the rotation direction of the rotor. When the rotor drives the thrust disc to rotate at high speed, negative pressure is generated to suck out the hot air at one end and discharge it to the outside, increasing the gas flow rate introduced, realizing the active ventilation heat exchange of the thrust disc itself, accelerating the gas flow, and at the same time cooperating with the ventilation holes and ventilation grooves in the axial stator coil slots to accelerate the gas flow in the cavity of the axial stator coil slots, realizing the effective independent heat dissipation of the axial coil and the thrust disc.

[0124] According to the principle of the axial magnetic levitation bearing, the relative position between the thrust disc and the axial magnetic pole is the force output position, that is, no holes can be drilled at the position where the end face of the thrust disc faces the magnetic pole 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 position where the magnetic circuit passes through ≥ the cross-sectional area of the magnetic pole position. The opening position of the inclined hole on the thrust disc is within the magnetic circuit. In each radial circumferential direction, the cross-sectional area of the position where the magnetic circuit passes through = the radial circumferential cross-sectional area of the thrust disc - the cross-sectional area in the same direction of the hole position ≥ the cross-sectional area of the magnetic pole position. The upper intake port of the inclined hole 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 axial stator magnetic poles; the lower intake port of the inclined hole is located at the non-magnetic conductive part of the inner ring of the lower axial magnetic pole, and the aperture size < the radial distance between the lower axial stator magnetic pole and the rotor. Both ends of the aperture are connected to the axial stator ventilation path. The air flow resistance at both ends of the thrust disc is small, and the fluidity is good, without affecting the axial force output.

[0125] The entire system uses an active pure air-cooled heat dissipation system. The cold air is driven by a coaxial impeller at the other end of the main impeller or by the centrifugal intake of the rotor rotation or by the leakage intake of the main impeller. No additional heat dissipation drive motor is required. The flow rate of the cooling 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.

[0126] In some embodiments,

[0127] It further includes a cylinder body 19, 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. A first air inlet 121 penetrating axially is arranged at the central axis position of the rear end cover 120. The first air inlet 121 faces the cooling impeller 10. The magnetic levitation bearing, the rotor 6 and the motor stator are all located inside the cylinder body 19;

[0128] A rear housing flow channel 220 is arranged axially on the rear housing 130. One end of the rear housing flow channel 220 can be respectively communicated with the motor rotor flow channel 240 and the motor stator flow channel 230. The other end of the rear housing flow channel 220 can be communicated with the impeller air outlet 210 of the cooling impeller 10;

[0129] So that air flow can successively enter the motor rotor flow channel 240 and the motor stator flow channel 230 through the first air inlet 121, the cooling impeller 10, the inside of the rear end cover 120 and the rear housing flow channel 220 respectively.

[0130] 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 suck gas from the air inlet into the inside of the rear end cover through the integral rotation of the cooling impeller with the rotor, and supply it to the motor rotor flow channel and the motor stator flow channel through the rear housing flow channel, improving the air flow circulation path, increasing the heat dissipation area of the stator and rotor parts, and improving the cooling and heat dissipation performance.

[0131] In some embodiments,

[0132] 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 channel between the front radial bearing 17 and the outer periphery of the rotor 6. There is a front housing flow channel 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;

[0133] A volute 8 is provided on the outer periphery of the front end cover 20. A main impeller 7 is provided at the other axial end of the rotor 6. The main impeller 7 is located within the volute 8. A second air inlet 81 is provided at the central axis position of the volute 8. The second air inlet 81 faces the main impeller 7. There is a leakage channel 25 between the main impeller 7 and the front end cover 20. There is a front end cover flow channel between the outer periphery of the front end cover 20 and the rotor 6.

[0134] so that the second air inlet 81, the main impeller 7, the leakage channel 25, the front end cover flow channel, the accommodation space, the front housing flow channel, the front radial bearing flow channel, and the air passage of the magnetic suspension bearing are sequentially communicated;

[0135] An air outlet 26 is provided through the inner and outer peripheral walls of the cylinder 19. The air outlet 26 is axially located between the magnetic suspension bearing and the motor stator 15, so that the motor stator flow channel 230, the motor rotor flow channel 240, or the air passage of the magnetic suspension bearing is sequentially communicated with the air outlet 26.

[0136] This is the structure of the magnetic suspension rotating machine of the present invention on the other axial side of the magnetic suspension bearing, including structures such as a main impeller for intake air, a front end cover, a front housing, and a front radial bearing, which can heat-exchange the gas inhaled by the main impeller to the front radial bearing and the magnetic suspension bearing. After the gas entering from the second air inlet exchanges heat with the magnetic bearing, it converges with the gas passing through the motor rotor flow channel and the motor stator flow channel from the first air inlet, and is then discharged through the motor air outlet, thereby forming multiple flow paths for cooling and dissipating heat from the magnetic bearing and the motor, and can further improve the cooling and heat dissipation performance of the magnetic suspension machine.

[0137] Figure 6The cooling flow path scheme of the magnetic levitation rotating machine of the present utility model is preferably a blower or the like, adopting an active pure air-cooled heat dissipation system. The cold air is provided by the leakage of the cooling impeller and the main impeller, and no additional heat dissipation drive motor is required. The main impeller 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 140 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 7 and the motor stator 15. A deflector 110 for guiding the flow of 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. A plurality of 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 axial bearing to facilitate the air flow conduction. The cooling gas is dissipated in two paths. The first path: the cooling gas at the impeller air outlet 210 passes through the rear housing flow path 220 on the rear housing 130 → the motor rotor flow path 240 and the motor stator flow path 230. The second path: the gas leaked from the main impeller 7 passes through the leakage channel 25 on the back → the front housing 18 → the front radial bearing 17 → the axial magnetic bearing, and is discharged through a first bearing stator ventilation hole 03, a bearing stator ventilation groove 04, a right-handed inclined hole of the thrust disk (the first thrust disk ventilation hole 01) and a second right-handed inclined hole of the thrust disk (the second thrust disk ventilation hole 02), a bearing stator ventilation groove 04', and a second bearing stator ventilation hole 03'. The three paths of gas are collected and discharged from the cylinder 19 through the air outlet 26. With this flow path structure arrangement, by utilizing the leakage of the main impeller and the air flow of the cooling impeller, the heat-generating components such as the motor stator, rotor, radial bearings, and axial bearings are effectively cooled. At the same time, for the high-heat-generating component, the thrust disk 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.

[0138] The beneficial effects of the present utility model are as follows:

[0139] 1. For the high-heat-generating component of the present utility model, inclined holes are provided on the thrust disk and are matched with the axial coil ventilation grooves. By using negative pressure, the heat is sucked out through the inclined hole flow path, which can actively cool the thrust disk itself and increase the cooling flow rate to accelerate the heat dissipation of the axial coil. The active pure air-cooled heat dissipation system reduces the heat dissipation cost, and the targeted ventilation of the heat-generating components can effectively accelerate the cooling and improve the reliability.

[0140] 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-cooled heat dissipation 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.

[0141] The present utility model further provides a magnetic levitation rotating machine (preferably a rotating machine such as a motor, a blower, a ventilator or a compressor), which includes the aforementioned magnetic levitation bearing.

[0142] Figure 1 , Figure 3 The internal axial bearing cooling path of the magnetic levitation machine (preferably a blower) of the present utility model is shown as follows. Bearing stator ventilation holes are provided on both the axial stator one / two. Bearing stator ventilation grooves are opened in the coil slots, preferably in a radial shape, a circular shape, a spiral shape or the like. Several offset X-shaped inclined holes that are from the inside to the outside and from the outside to the inside in the axial and radial spaces are opened on the thrust disk 3 (the holes from the inside to the outside or the holes from the outside to the inside can exist alone, or both can exist at the same time). One opening of the inclined hole is directly opposite to the coil at the axial inner and outer magnetic poles, corresponding to the ventilation at the wire groove. There is no requirement for the hole shape for the convenience of machining and technology. Preferably, it is a circular hole, a rectangular round hole or an oval hole. It is divided into two cooling paths. The first cooling path intakes air from the ventilation holes on the axial stator, passes through the ventilation groove, the inner circle of the axial coil, and between the axial inner and outer magnetic poles, and then discharges through the inclined holes on the thrust disk. The second cooling path intakes air from the inclined holes on the thrust disk, passes through between the axial inner and outer magnetic poles of the axial stator, the inner circle of the axial coil, the axial stator ventilation groove, and then discharges through the ventilation holes on the axial stator (if there are only holes from the inside to the outside or only holes from the outside to the inside, there is only one path). During operation, the intake direction of the inclined holes on the thrust disk is opposite to the rotation direction of the rotor. The thrust disk uses negative pressure to suck out the heat dissipation gas, increasing the gas flow rate, accelerating the heat exchange between the thrust disk and the axial coil, and cooperating with the overall cooling path of the scheme to achieve an effective heat dissipation effect. In order to make the thrust disk 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 inclined holes on the thrust disk is related to the intake direction of the thrust disk and the rotation direction of the rotor. If the left end of the thrust disk intakes air and the rotor rotates clockwise when viewed from the right end, the thrust disk is a right-handed inclined hole. If the left end of the thrust disk intakes air and the rotor rotates counterclockwise when viewed from the right end, the thrust disk 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.

[0143] 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 in the protection scope of the present utility model. The above is only the preferred implementation manner of the present utility model. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the technical principle of the present utility model, several improvements and modifications can still be made, 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 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 (15) along the axial direction, a rotor air gap exists between the rotor (6) and the motor stator to form a motor rotor flow channel (240), and both the motor stator flow channel (230) and the motor rotor flow channel (240) 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 first thrust plate ventilation hole (01) is provided on the thrust plate (3) from one axial end face to the other axial end face. 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 at intervals in the radial direction of the axial stator 1 (1), and a coil slot 1 (13) is formed between the two. A coil 1 (5) is arranged in the coil slot 1 (13). The axial stator 2 (2) comprises a radial outer portion 2 (21) and a radial inner portion 2 (22), One end of the first thrust plate ventilation hole (01) located on the other axial end surface of the thrust plate (3) is located between the radial inner side portion 2 (22) of the axial stator 2 (2) and the rotor (6), and one end of the first thrust plate ventilation hole (01) located on the 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 first thrust plate ventilation hole (01) is not opposite to the magnetic pole position of the axial stator 1 (1); The airflow flowing out of the motor rotor flow channel (240), the airflow flowing out of the motor stator flow channel (230), and the airflow flowing out of the first thrust plate ventilation hole (01) can all be discharged through the air outlet (26).

2. The magnetic levitation rotating machine according to claim 1, characterized in that: It also includes a pressure plate (4), the pressure plate (4) being located between the axial stator (1) and the thrust plate (3), and an axial end surface of the pressure plate (4) being connected to the radial outer side portion (11) of the axial stator (1), and the other axial end surface of the pressure plate (4) being opposite to the thrust plate (3); The magnetic pole position of the axial stator (1) includes a portion of the pressure 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 pressure plate (4) and the radial inner portion (12); the first thrust disk ventilation 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 an end of the first thrust disk ventilation hole (01) opposite to the coil slot (13).

3. The magnetic levitation rotating machine according to claim 2, 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 first 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, 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). The axial stator (1) further comprises an axial outer portion (14), which is arranged in the axial direction of the magnetic bearing relative to the coil (5) and away from the thrust plate (3), and inside the coil slot (13), there is also a third gap between the axial outer portion (14) and the coil (5), forming a bearing stator ventilation slot (04); A bearing stator ventilation hole (03) is provided on the axial outer side (14) of the axial stator (1), and the bearing stator ventilation hole (03) extends from one axial end surface of the axial outer side (14) to the other axial end surface to communicate with the bearing stator ventilation groove (04), and further communicates with the first thrust plate ventilation hole (01) through the first gas flow path (06); The air outlet (26) can be connected to the bearing stator ventilation hole (03) through the first thrust plate ventilation hole (01).

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 ventilation hole (01) is an inclined hole structure whose extension direction is not parallel to the axis of the thrust plate (3); when observing from the axial end face of the air inlet side of the thrust plate (3) toward the axial end face of the air outlet side, the rotation direction of the thrust plate (3) is toward a first rotation direction; the extension direction of the first thrust plate ventilation hole (01) from the axial end face of the air inlet side of the thrust plate (3) toward the axial end face of the air outlet side 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 ventilation holes (01), which are arranged at intervals along the circumferential direction of the thrust plate (3), and each of the first thrust plate ventilation holes (01) extends from the axial end face on the air inlet side of the thrust plate toward the axial end face on the air outlet side 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 thrust disc (3) is provided with a second thrust disc ventilation hole (02) extending from the other axial end surface to the one axial end surface thereof, and the second thrust disc ventilation hole (02) is offset from the first thrust disc ventilation hole (01) and is not connected; 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), one end of the second thrust plate ventilation hole (02) located on the one axial end face of the thrust plate (3) is located between the radial inner portion 1 (12) of the axial stator 1 (1) and the rotor (6), one end of the second thrust plate ventilation hole (02) located on the other axial end face of the thrust plate (3) is opposite to the position of the coil slot 2 (23) in the axial direction, and the second thrust plate ventilation hole (02) is not opposite to the magnetic pole position of the axial stator 2 (2); The air outlet (26) can also be in communication with the second thrust plate ventilation hole (02).

8. The magnetic levitation rotating machine according to claim 7, characterized in that: It also includes a second pressure plate (4'), the second pressure plate (4') is located between the second axial stator (2) and the thrust plate (3), and one axial end surface of the second pressure 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 pressure plate (4') is opposite to the thrust plate (3); The magnetic pole position of the axial stator 2 (2) includes a portion of the pressure 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 pressure plate 2 (4') and the radial inner portion 2 (22); the second thrust plate ventilation 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 an end of the second thrust plate ventilation hole (02) opposite to the coil slot 2 (23).

9. The magnetic levitation rotating machine according to claim 8, 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 second thrust disk ventilation hole (02) ≥ the cross-sectional area of ​​the magnetic pole position of the axial stator 2 (2).

10. 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). The axial stator 2 (2) further comprises an axial outer portion 2 (24), the axial outer portion 2 (24) being arranged in the axial direction of the magnetic bearing relative to the coil 2 (5') and away from the thrust plate (3), and inside the coil slot 2 (23), there is also a sixth gap between the axial outer portion 2 (24) and the coil 2 (5'), forming a bearing stator ventilation slot 2 (04'); A bearing stator ventilation hole 2 (03') is provided on the axial outer side 2 (24) of the axial stator 2 (2), 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 to communicate with the bearing stator ventilation groove 2 (04'), and further communicates with the second thrust plate ventilation hole (02) through the second gas flow path (08); The air outlet (26) is connected to the second thrust plate ventilation hole (02) through the second bearing stator ventilation hole (03').

11. The magnetic levitation rotating machine according to claim 7, characterized in that: Along the axial direction of the thrust plate (3), the second thrust plate ventilation 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 axial end face of the air inlet side of the thrust plate (3) toward the axial end face of the air outlet side, the rotation direction of the thrust plate (3) is toward a third rotation direction; the extension direction of the second thrust plate ventilation hole (02) from the axial end face of the air inlet side of the thrust plate (3) toward the axial end face of the air outlet side 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 ventilation holes (02), which are arranged at intervals along the circumferential direction of the thrust plate (3), and each of the second thrust plate ventilation holes (02) extends from the axial end face on the air inlet side of the thrust plate toward the axial end face on the air outlet side 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 1, characterized in that: It also comprises a barrel (19), 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 be able to rotate integrally with the rotor (6), the cooling impeller (10) is arranged inside the rear end cover (120), a first air inlet (121) penetrating axially is arranged at the central axis position of the rear end cover (120), the first air inlet (121) is directly opposite to the cooling impeller (10), and the magnetic suspension bearing, the rotor (6) and the motor stator are all located inside the barrel (19); A rear casing flow channel (220) is axially arranged on the rear casing (130), one end of the rear casing flow channel (220) can be communicated with the motor rotor flow channel (240) and the motor stator flow channel (230) respectively, and the other end of the rear casing flow channel (220) can be communicated with the impeller air outlet (210) of the cooling impeller (10); The airflow can sequentially pass 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) to enter the motor rotor flow channel (240) and the motor stator flow channel (230) respectively.

14. The magnetic levitation rotating machine according to claim 13, 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 (8) is arranged on the outer periphery of the front end cover (20), a main impeller (7) is arranged at the other axial end of the rotor (6), the main impeller (7) is located in the volute (8), a second air inlet (81) is arranged at the central axis position of the volute (8), the second air inlet (81) is directly opposite to the main impeller (7), a leakage channel (25) is arranged between the main impeller (7) and the front end cover (20), and a front end cover flow channel is arranged between the front end cover (20) and the outer periphery of the rotor (6), The second air inlet (81), the main impeller (7), the leakage channel (25), 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; The air outlet (26) is provided through the inner and outer peripheral walls of the cylinder (19), and the air outlet (26) is axially located between the magnetic bearing and the motor stator (15), so that the motor stator flow channel (230), the motor rotor flow channel (240) or the air channel of the magnetic bearing is connected to the air outlet (26).

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