A magnetic levitation rotating machine

Abstract

The present invention provides a magnetic levitation rotating machine, comprising: a magnetic levitation bearing, a motor stator, and a rotor; a thrust plate disposed between an axial stator 1 and an axial stator 2; a thrust plate ventilation hole extending from one axial end face to the other axial end face of the thrust plate; the axial stator 1 comprising a radial outer portion 1 and a radial inner portion 1; the radial outer portion 1 and the radial inner portion 1 being spaced apart in the radial direction of the axial stator 1, and forming a coil slot 1 therebetween; a first thrust plate air inlet hole located at one end of the axial end face of the thrust plate opposite to the position of the coil slot 1 in the axial direction; a motor rotor flow channel capable of communicating with the bearing stator ventilation hole 1 and the motor stator flow channel; and one end of the first thrust plate air inlet hole not opposite to the magnetic pole position of the axial stator 1. According to the present invention, while improving heat dissipation and cooling of the magnetic levitation bearing, the present invention also avoids affecting the magnetic levitation magnetic circuit, thereby ensuring sufficient magnetic levitation support force.

Description

Technical Field

[0001] The present invention relates to the technical field of magnetic suspension bearings, and in particular to a magnetic suspension rotating machine. Background Art

[0002] Currently, heat dissipation for magnetically levitated rotating machinery primarily relies on external cooling equipment, typically external cooling fans, water cooling systems, and heat exchangers. This results in high maintenance costs, complex structural systems, and increased safety risks. Alternatively, heat is drawn out of the magnetically levitated rotating machinery using negative pressure, which ineffectively dissipates heat from internal components. This is particularly problematic for the axial magnetic bearings, impacting the stable operation of the magnetically levitated air compressor.

[0003] Axial magnetic bearings achieve axial movement of the rotating shaft, and an axial force-bearing component, the thrust plate, is essential on the shaft. However, the axial magnetic bearing and thrust plate are made of solid pure iron, which has relatively high losses and poor thermal conductivity. Without effective cooling, they will generate severe heat. To prevent excessive temperature rise in the axial magnetic bearing, forced air cooling is often applied externally to dissipate heat. The cooling air is input from the outside and passes through the gap between the bearing stator and the thrust plate to dissipate heat from the axial magnetic bearing. However, the heat dissipation efficiency is not high.

[0004] Since the magnetic suspension bearings inside the rotating machinery in the prior art have technical problems such as poor cooling and heat dissipation effects, the present invention studies and designs a magnetic suspension rotating machinery. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defect of poor cooling and heat dissipation effect of the magnetic suspension bearing inside the rotating machine in the prior art, thereby providing a magnetic suspension rotating machine.

[0006] In order to solve the above problems, the present invention provides a magnetic levitation rotating machine, which includes:

[0007] A magnetic bearing, a motor stator, and a rotor, wherein the motor stator is located on the radial outer periphery of a portion of the rotor shaft segment, a motor stator flow channel is axially opened on the motor stator, a rotor air gap exists between the rotor and the motor stator to form a motor rotor flow channel, and gas can flow through both the motor stator flow channel and the motor rotor flow channel; the magnetic bearing is located on one axial side of the motor stator and can support the rotor;

[0008] The magnetic bearing comprises an axial stator 1, an axial stator 2 and a thrust plate. In the axial direction of the magnetic bearing, the thrust plate is arranged between the axial stator 1 and the axial stator 2. A thrust plate ventilation hole is provided on the thrust plate from its axial end face to its other axial end face. The axial stator 1 comprises a radial outer portion 1 and a radial inner portion 1. The radial outer portion 1 and the radial 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 provided in the coil slot 1.

[0009] The thrust plate ventilation hole includes a first thrust plate air inlet hole extending from one axial end surface of the thrust plate toward the interior of the thrust plate, and a second thrust plate air inlet hole extending from the other axial end surface of the thrust plate toward the interior of the thrust plate, one end of the first thrust plate air inlet hole located inside the thrust plate is connected with one end of the second thrust plate air inlet hole located inside the thrust plate, and after being connected, the second end is connected to the outer periphery of the thrust plate through the thrust plate air outlet hole, one end of the first thrust plate air inlet hole located on one axial end surface of the thrust plate is opposite to the position of the coil slot one in the axial direction, and the one end of the first thrust plate air inlet hole is not opposite to the magnetic pole position of the axial stator one;

[0010] The axial stator 1 further includes an axial outer portion 1, and the axial outer portion 1 is arranged in the axial direction of the magnetic bearing relative to the coil 1 and away from the thrust plate.

[0011] A bearing stator ventilation hole 1 is provided on the axial outer side 1 of the axial stator 1, and the bearing stator ventilation hole 1 passes through from one axial end face of the axial outer side 1 to the other axial end face, and the bearing stator ventilation hole 1 can be connected with the air inlet hole of the first thrust plate; the motor rotor flow channel can be connected with the bearing stator ventilation hole 1 and the motor stator flow channel respectively.

[0012] In some embodiments,

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

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

[0015] The bearing stator ventilation hole 1 is connected to the bearing stator ventilation slot 1, and is further connected to the first thrust plate air inlet hole through the first gas flow path.

[0016] In some embodiments,

[0017] The cover plate 1 is located between the axial stator 1 and the thrust plate, and an axial end surface of the cover plate 1 is connected to the radial outer portion 1 of the axial stator 1, and the other axial end surface of the cover plate 1 is opposite to the thrust plate;

[0018] The magnetic pole position of the axial stator 1 includes a portion of the cover plate 1 opposite to the thrust disk, and a portion of the radial inner portion 1 opposite to the thrust disk. A first gap is provided between the cover plate 1 and the radial inner portion 1. The first thrust disk air inlet hole is opposite to the first gap in the axial direction, and a radial dimension of the first gap is greater than or equal to a radial dimension of the first thrust disk air inlet hole.

[0019] In some embodiments,

[0020] In any radial cross-section of the thrust plate, the cross-sectional area of ​​the magnetic path flow position of the axial stator 1 = the radial cross-sectional area of ​​the relative portion of the thrust plate and the axial stator 1 - the cross-sectional area of ​​the thrust plate ventilation hole - the cross-sectional area of ​​the thrust plate air outlet hole ≥ the cross-sectional area of ​​the magnetic pole position of the axial stator 1.

[0021] In some embodiments,

[0022] Along the axial direction of the thrust plate, the first thrust plate air inlet hole is an inclined hole structure whose extension direction is not parallel to the axis of the thrust plate. When observing from one axial end face of the thrust plate toward the other axial end face thereof, the rotation direction of the thrust plate is toward the first rotation direction, and the extension direction of the first thrust plate air inlet hole from one axial end face to the other axial end face is toward the second rotation direction, and the second rotation direction is opposite to the first rotation direction.

[0023] In some embodiments,

[0024] There are multiple air inlet holes in the first thrust plate, and the multiple air inlet holes in the first thrust plate are arranged at intervals along the circumferential direction of the thrust plate. The extension direction of each air inlet hole in the first thrust plate from one axial end face to the other axial end face is toward the second rotation direction, which is opposite to the first rotation direction of the thrust plate.

[0025] In some embodiments,

[0026] The second axial stator comprises a second radial outer portion and a second radial inner portion, the second radial outer portion and the second radial inner portion are spaced apart in the radial direction of the second axial stator, and a second coil slot is formed therebetween, a second coil is arranged in the second coil slot, the second thrust plate air inlet hole is located at one end of the other axial end surface of the thrust plate and is opposite to the position of the second coil slot in the axial direction, and the one end of the second thrust plate air inlet hole is not opposite to the magnetic pole position of the second axial stator;

[0027] The second axial stator further includes a second axial outer portion, and the second axial outer portion is arranged in the axial direction of the magnetic bearing relative to the second coil and away from the thrust plate.

[0028] A second bearing stator ventilation hole is provided on the second axial outer portion of the second axial stator. The second bearing stator ventilation hole extends from one axial end surface of the second axial outer portion to the other axial end surface of the second axial stator. The second bearing stator ventilation hole can be communicated with the air inlet hole of the second thrust plate.

[0029] The motor rotor flow channel is communicated with the first bearing stator ventilation hole or the second bearing stator ventilation hole.

[0030] In some embodiments,

[0031] Inside the coil slot 2, a fifth gap is provided between the radial inner side of the coil 2 and the radial inner portion 2, forming a second gas flow path.

[0032] Inside the second coil slot, a sixth gap is also provided between the second axially outer portion and the second coil, forming a second bearing stator ventilation slot;

[0033] The second bearing stator ventilation hole is connected to the second bearing stator ventilation slot, and is further connected to the second thrust plate air inlet hole through the second gas flow path.

[0034] In some embodiments,

[0035] The second cover plate is located between the second axial stator and the thrust plate, and one axial end surface of the second cover plate is in contact with the second radial outer portion of the second axial stator, and the other axial end surface of the second cover plate is opposite to the thrust plate;

[0036] The magnetic pole position of the axial stator 2 includes the part of the cover plate 2 opposite to the thrust plate, and the part of the radial inner part 2 opposite to the thrust plate. There is a fourth gap between the cover plate 2 and the radial inner part 2. The second thrust plate air inlet hole is opposite to the fourth gap in the axial direction, and the radial dimension of the fourth gap is greater than or equal to the radial dimension of the second thrust plate air inlet hole.

[0037] In some embodiments,

[0038] In each radial cross-section of the thrust plate, the cross-sectional area of ​​the magnetic path flow position of the axial stator 2 = the radial cross-sectional area of ​​the opposing portion of the thrust plate and the axial stator 2 - the cross-sectional area of ​​the thrust plate ventilation holes - the cross-sectional area of ​​the thrust plate air outlet holes ≥ the cross-sectional area of ​​the magnetic pole position of the axial stator 2.

[0039] In some embodiments,

[0040] Along the axial direction of the thrust plate, the second thrust plate air inlet hole is an inclined hole structure whose extension direction is not parallel to the axis of the thrust plate. When observing from the other axial end face of the thrust plate toward one axial end face, the rotation direction of the thrust plate is toward a third rotation direction. The extension direction of the second thrust plate air inlet hole from the other axial end face to the one axial end face is toward a fourth rotation direction, and the fourth rotation direction is opposite to the third rotation direction.

[0041] In some embodiments,

[0042] There are multiple air inlet holes in the second thrust plate, and the multiple air inlet holes in the second thrust plate are arranged at intervals along the circumferential direction of the thrust plate, and the extension direction of each of the air inlet holes in the second thrust plate from the other axial end face to the one axial end face is toward the fourth rotation direction, which is opposite to the third rotation direction of the thrust plate.

[0043] In some embodiments,

[0044] The first thrust plate air inlet, the thrust plate air outlet and the second thrust plate air inlet correspond to each other one by one, forming a group of air outlet units. There are multiple groups of air outlet units, and the multiple groups of air outlet units are arranged at intervals along the circumferential direction of the thrust plate.

[0045] In some embodiments,

[0046] When the thrust plate meets magnetic saturation, the minimum axial width of the magnetic path flow area is N, and the axial aperture of the thrust plate air outlet is calculated as follows: the axial thickness of the thrust plate - N.

[0047] In some embodiments,

[0048] The outer periphery of the axial stator 1 and the axial stator 2 also has a cylinder, and the position of the cylinder opposite to the thrust plate air outlet of the thrust plate is also provided with a bearing air outlet, which can be used to connect with the thrust plate air outlet and exhaust outward.

[0049] In some embodiments,

[0050] The rotor further comprises a rear end cover, a cooling impeller, a rear housing and a rear radial bearing, wherein the cooling impeller is arranged at one axial end of the rotor so as to rotate integrally with the rotor, the cooling impeller is arranged inside the rear end cover, a first air inlet is axially passed through the central axis of the rear end cover, the first air inlet is directly opposite to the cooling impeller, and the magnetic bearing and the motor stator are both located inside the cylinder;

[0051] The rear housing is axially connected between the rear end cover and the cylinder, and a rear housing flow channel is axially provided on the rear housing, one end of the rear housing flow channel can be communicated with 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;

[0052] The air flow can enter the motor rotor flow channel through the first air inlet, the cooling impeller, the interior of the rear end cover and the rear housing flow channel in sequence.

[0053] In some embodiments,

[0054] It also includes a front radial bearing, a front housing and a front end cover, wherein the front radial bearing and the front housing 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 and the outer periphery of the rotor, a front housing flow channel is provided between the front housing and the outer periphery of the rotor, the front end cover is provided on the axial side of the cylinder away from the rear end cover, and an accommodating space is formed between the front end cover and the front housing;

[0055] A volute is provided on the outer periphery of the front end cover, a main impeller is provided on the other axial end of the rotor, the main impeller is located in the volute, a second air inlet is provided at the central axis of the volute, the second air inlet is directly opposite to the main impeller, a leakage channel is provided between the main impeller and the front end cover, and a front end cover flow channel is provided between the front end cover and the outer periphery of the rotor,

[0056] The second air inlet, the main impeller, the leakage channel, the front cover flow channel, the accommodating space, the front housing flow channel, the front radial bearing flow channel and the air channel of the magnetic bearing are connected in sequence, and then exhausted through the bearing air outlet;

[0057] The inner and outer peripheral walls of the cylinder are penetrated with a motor air outlet, and the motor air outlet is opposite to and connected with the motor stator flow channel, so that the motor rotor flow channel, the motor stator flow channel and the motor air outlet are connected in sequence.

[0058] The magnetic levitation rotating machine provided by the present invention has the following beneficial effects:

[0059] 1. The present invention provides a thrust plate ventilation hole and a thrust plate air outlet hole on the thrust plate, wherein the thrust plate ventilation hole includes a first thrust plate air inlet hole extending from one axial end face of the thrust plate toward the inside of the thrust plate, and a second thrust plate air inlet hole extending from the other axial end face of the thrust plate toward the inside of the thrust plate, which can realize its own active air suction heat exchange through high rotation speed, increase the gas flow rate introduced, accelerate the cooling of the axial magnetic bearing, actively cool the thrust plate itself and increase the cooling flow rate to accelerate the heat dissipation of the axial coil, improve the cooling and heat dissipation effect of the magnetic suspension bearing, and the first thrust plate air inlet hole is not opposite to the magnetic pole position of the axial stator one, so that the thrust plate end face is not punched at the position facing the magnetic pole position of the axial stator one, so that the cooling However, the air cannot directly reach the position of the magnetic pole gap, which can effectively avoid the cooling gas and the opening from affecting the magnetic furnace structure, thereby avoiding insufficient axial support force of the magnetic suspension, achieving improved heat dissipation and cooling of the magnetic suspension bearing while avoiding affecting the magnetic suspension magnetic circuit, ensuring sufficient magnetic suspension support force, and effectively reducing the influence of the gas force on the axial force; the present invention also preferably arranges the thrust plate ventilation hole between the axial upper and lower magnetic poles directly opposite the coil, and the aperture size is ≤ the radial spacing between the axial upper and lower magnetic poles of the stator, which can make the thrust plate ventilation hole further effectively avoid the magnetic pole position, further avoid affecting the magnetic circuit, and the thrust plate ventilation hole is connected to the ventilation paths at both ends without obstruction, which can also make the airflow resistance at both ends of the thrust plate small and the fluidity good;

[0060] The present invention also provides a motor stator flow channel on the motor stator and a motor rotor flow channel on the rotor, so that the air intake cooling gas enters the motor rotor from the rear housing and then divides into two paths, one path flows out from the motor stator, and the other path flows out from the axial magnetic bearing (thrust plate inclined hole + axial bearing stator ventilation hole), thereby increasing the air flow area of ​​the magnetic bearing and the motor stator, and further improving the cooling and heat dissipation efficiency and cooling and heat dissipation performance of the magnetic levitation machinery; and the present invention has two air inlets at both ends of the axial direction, which can make the two gases flow toward the direction of the magnetic bearing, and complete mixing inside the thrust plate of the magnetic bearing, and finally be discharged from the bearing outlet, thereby increasing the air flow path of the magnetic bearing, increasing the heat exchange area, and improving the cooling and heat dissipation performance.

[0061] 2. The present invention further sets the relationship in any radial cross section of the thrust disk: the cross-sectional area of ​​the magnetic circuit flow position of the axial stator 1 = the radial cross-sectional area of ​​the thrust disk and the corresponding part of the axial stator 1 - the cross-sectional area of ​​the thrust disk ventilation hole - the cross-sectional area of ​​the thrust disk air outlet hole ≥ the cross-sectional area of ​​the magnetic pole position of the axial stator 1, so that the other magnetic circuit parts on the thrust disk that are different from the magnetic pole position will not experience magnetic field saturation before the magnetic pole position, thereby ensuring the formation of a normal magnetic flux circuit and the continuous and effective provision of the magnetic levitation supporting force; the present invention further sets the first thrust disk air inlet hole so that the extension direction from one axial end face to the other axial end face is toward the second rotation direction, and The second rotation direction is opposite to the first rotation direction (rotation direction of the thrust plate), and can generate negative pressure when the rotor drives the thrust plate to rotate at high speed, sucking out the hot air at one end and discharging it to the outside, thereby increasing the gas flow rate entering, realizing active ventilation and heat exchange of the thrust plate itself, accelerating gas flow, saving energy consumption, improving heat dissipation performance and energy efficiency; at the same time, in conjunction with the bearing stator ventilation hole provided on the axial outer side, and the stator ventilation slot and gas flow path (multiple gas flow paths) in the axial stator coil slot, the gas flow in the axial stator coil slot cavity can be further accelerated, thereby realizing effective autonomous heat dissipation of the axial coil and the thrust plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] Figure 1 It is a longitudinal sectional perspective view of a magnetic suspension bearing of a magnetic suspension rotating machine of the present invention;

[0063] Figure 2 yes Figure 1 A three-dimensional internal structure diagram of the thrust plate structure;

[0064] Figure 3 This is a three-dimensional structural diagram of the axial stator core of the magnetic bearing of the present invention;

[0065] Figure 4 It is a longitudinal sectional view of the magnetic levitation rotating machine of the present invention.

[0066] The reference numerals indicate:

[0067] 1. Axial stator 1; 11. Radially outer portion 1; 12. Radially inner portion 1; 13. Coil slot 1; 14. Axial outer portion 1; 2. Axial stator 2; 21. Radially outer portion 2; 22. Radially inner portion 2; 23. Coil slot 2; 24. Axial outer portion 2; 3. Thrust plate; 4. Cover plate 1; 4', Cover plate 2; 5. Coil 1; 5', Coil 2; 6. Rotor; 9. Stator housing; 10. Cooling impeller; 110. Guide plate; 120. Rear end cover; 1 21. First air inlet; 130. Rear housing; 140. Rear radial bearing; 15. Motor stator; 17. Front radial bearing; 18. Front housing; 19. Cylinder; 20. Front end cover; 210. Impeller air outlet; 220. Rear housing flow channel; 230. Motor stator flow channel; 25. Motor rotor flow channel; 26. Bearing air outlet; 28. Motor air outlet; 29. ​​Leakage channel; 30. Main impeller; 31. Volute; 311. Second air inlet; 32. Stator housing;

[0068] 01. First thrust plate air inlet; 02. Second thrust plate air inlet; 03. Bearing stator ventilation hole 1; 03', bearing stator ventilation hole 2; 04. Bearing stator ventilation slot 1; 04', bearing stator ventilation slot 2; 05. First gap; 06. First gas flow path; 07. Fourth gap; 08. Second gas flow path; 09. Thrust plate air outlet. DETAILED DESCRIPTION

[0069] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0070] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0071] Unless otherwise specifically stated, the relative arrangement of the parts and steps, the numerical expressions and the numerical values ​​set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values ​​should be interpreted as being merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0072] In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0073] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0074] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0075] like Figure 1-4As shown, the present invention provides a magnetic levitation rotating machine, characterized in that it includes:

[0076] A magnetic bearing, a motor stator 15, and a rotor 6. The motor stator 15 is located radially on the outer periphery of a portion of the rotor 6. A motor stator flow channel 230 is axially provided on the motor stator. A rotor air gap exists between the rotor 6 and the motor stator to form a motor rotor flow channel 25 (i.e., a motor rotor flow channel is formed between the rotor and the stator). Both the motor stator flow channel 230 and the motor rotor flow channel 25 can circulate gas. The magnetic bearing is located on one axial side of the motor stator and can support the rotor 6.

[0077] The magnetic bearing includes an axial stator 1, an axial stator 2, and a thrust plate 3. In the axial direction of the magnetic bearing, the thrust plate 3 is arranged between the axial stator 1 and the axial stator 2. A thrust plate ventilation hole is provided on the thrust plate 3 from one axial end surface to the other axial end surface. The axial stator 1 includes a radial outer portion 11 and a radial inner portion 12. The radial outer portion 11 and the radial inner portion 12 are spaced apart in the radial direction of the axial stator 1, and a coil slot 13 is formed therebetween. The coil slot 13 is provided with a coil 5.

[0078] The thrust plate ventilation hole includes a first thrust plate air inlet hole 01 extending from one axial end surface of the thrust plate 3 toward the interior of the thrust plate 3, and a second thrust plate air inlet hole 02 extending from the other axial end surface of the thrust plate 3 toward the interior of the thrust plate 3. One end of the first thrust plate air inlet hole 01 located inside the thrust plate 3 is connected with one end of the second thrust plate air inlet hole 02 located inside the thrust plate 3, and after being connected, it is connected to the outer periphery of the thrust plate 3 through the thrust plate air outlet hole 09. One end of the first thrust plate air inlet hole 01 located on one axial end surface of the thrust plate 3 is opposite to the position of the coil slot 13 in the axial direction, and the one end of the first thrust plate air inlet hole 01 is not opposite to the magnetic pole position of the axial stator 1;

[0079] The axial stator 1 further includes an axial outer portion 14, and the axial outer portion 14 is arranged in the axial direction of the magnetic bearing relative to the coil 5 and away from the thrust plate 3.

[0080] A bearing stator ventilation hole 03 is provided on the axial outer side 14 of the axial stator 1. The bearing stator ventilation hole 03 extends from one axial end face of the axial outer side 14 to the other axial end face. The bearing stator ventilation hole 03 can be connected with the first thrust plate air inlet hole 01; the motor rotor flow channel 25 can be connected with the bearing stator ventilation hole 03 and the motor stator flow channel 230 respectively.

[0081] The present invention provides thrust disc ventilation holes and thrust disc air outlet holes on the thrust disc. The thrust disc ventilation holes include a first thrust disc air inlet hole extending from one axial end face of the thrust disc toward the interior of the thrust disc, and a second thrust disc air inlet hole extending from the other axial end face of the thrust disc toward the interior of the thrust disc. The thrust disc can realize its own active air suction and heat exchange through high rotation speed, increase the flow rate of gas introduced, accelerate the cooling of the axial magnetic bearing, actively cool the thrust disc itself and increase the cooling flow rate to accelerate the heat dissipation of the axial coil, improve the cooling and heat dissipation effect of the magnetic suspension bearing, and make the first thrust disc air inlet hole not opposite to the magnetic pole position of the axial stator one, so that the end face of the thrust disc can be facing the axial stator one. No holes are punched at the magnetic pole position, so that the cooling air cannot directly reach the magnetic pole gap position, which can effectively avoid the cooling gas and the opening from affecting the magnetic furnace structure, thereby avoiding insufficient axial support force of the magnetic suspension, achieving improved heat dissipation and cooling of the magnetic suspension bearing while avoiding affecting the magnetic suspension magnetic circuit, ensuring sufficient magnetic suspension support force, and effectively reducing the influence of the gas force on the axial force; the present invention also provides a bearing stator ventilation hole on the axial outer side, and the bearing stator ventilation hole can be connected to the first thrust plate air inlet hole, which can provide an air flow channel, further accelerate the gas flow in the axial stator coil slot cavity, and achieve effective autonomous heat dissipation of the axial coil and the thrust plate;

[0082] The present invention also provides a motor stator flow channel on the motor stator and a motor rotor flow channel on the rotor, so that the air intake cooling gas enters the motor rotor from the rear housing and then divides into two paths, one path flows out from the motor stator and the other flows out from the axial magnetic levitation bearing (thrust plate inclined hole + axial bearing stator ventilation hole), thereby increasing the air flow area of ​​the magnetic levitation bearing and the motor stator, and further improving the cooling and heat dissipation efficiency and cooling and heat dissipation performance of the magnetic levitation machinery.

[0083] In some embodiments,

[0084] Inside the coil slot 13, a second gap is provided between the radial inner side of the coil 5 and the radial inner portion 12, forming a first gas flow path 06.

[0085] Inside the coil slot 13, a third gap is also provided between the axially outer portion 14 and the coil 5, forming a bearing stator ventilation slot 04;

[0086] The bearing stator ventilation hole 03 is connected to the bearing stator ventilation groove 04, and is further connected to the first thrust plate air inlet hole 01 through the first gas flow path 06.

[0087] The present invention is capable of forming multiple gas flow paths from both sides toward the thrust plate ventilation holes of the middle thrust plate by providing a bearing stator ventilation hole on the axial outer portion, a stator ventilation slot and a gas flow path in the axial stator coil slot, thereby further accelerating the gas flow in the axial stator coil slot cavity and realizing effective autonomous heat dissipation of the axial coil and the thrust plate.

[0088] In some embodiments,

[0089] The cover plate 14 is located between the axial stator 1 and the thrust plate 3, and one axial end surface of the cover plate 14 is connected to the radial outer portion 11 of the axial stator 1, and the other axial end surface of the cover plate 14 is opposite to the thrust plate 3.

[0090] The magnetic pole position of the axial stator 1 includes the portion of the cover plate 4 opposite to the thrust plate 3, and the portion of the radial inner portion 12 opposite to the thrust plate 3. There is a first gap 05 between the cover plate 4 and the radial inner portion 12. The first thrust plate air inlet hole 01 and the first gap 05 are opposite to each other in the axial direction, and the radial dimension of the first gap 05 is greater than or equal to the radial dimension of the first thrust plate air inlet hole 01.

[0091] The present invention also preferably arranges the thrust plate ventilation hole between the axial upper and lower magnetic poles directly opposite the coil, and the aperture size is ≤ the radial spacing between the axial upper and lower magnetic poles of the stator, so that the first thrust plate air inlet hole can further effectively avoid the magnetic pole position, further avoiding the influence on the magnetic circuit, and the thrust plate ventilation hole is connected with the ventilation paths at both ends without obstruction, and the air flow resistance at both ends of the thrust plate can be small and the fluidity is good; and the bearing stator ventilation hole 1, the bearing stator ventilation groove 1, the first gas flow path, the first gap and the first thrust plate air inlet hole are connected in sequence to form an air flow channel.

[0092] In some embodiments,

[0093] In any radial cross-section of the thrust disk 3, the cross-sectional area of ​​the magnetic path flow position of the axial stator 1 = the radial cross-sectional area of ​​the relative portion of the thrust disk and the axial stator 1 - the cross-sectional area of ​​the thrust disk ventilation hole - the cross-sectional area of ​​the thrust disk air outlet hole 09 ≥ the cross-sectional area of ​​the magnetic pole position of the axial stator 1.

[0094] The present invention further sets the relationship within any radial cross-section of the thrust disk: the cross-sectional area of ​​the magnetic circuit flow position of the axial stator 1 = the radial cross-sectional area of ​​the thrust disk and the corresponding part of the axial stator 1 - the cross-sectional area of ​​the thrust disk ventilation hole - the cross-sectional area of ​​the thrust disk air outlet hole ≥ the cross-sectional area of ​​the magnetic pole position of the axial stator 1, so that other magnetic circuit parts on the thrust disk that are different from the magnetic pole position will not experience magnetic field saturation before the magnetic pole position, thereby ensuring the formation of a normal magnetic flux circuit and the continuous and effective provision of magnetic levitation supporting force.

[0095] In some embodiments,

[0096] Along the axial direction of the thrust plate 3, the first thrust plate air inlet hole 01 is an inclined hole structure whose extension direction is not parallel to the axis of the thrust plate 3. When observing from one axial end face of the thrust plate 3 toward the other axial end face thereof, the rotation direction of the thrust plate 3 is toward the first rotation direction, and the extension direction of the first thrust plate air inlet hole 01 from one axial end face to the other axial end face is toward the second rotation direction, and the second rotation direction is opposite to the first rotation direction.

[0097] The present invention also sets the air inlet hole of the first thrust plate so that the extension direction from one axial end face to the other axial end face is toward the second rotation direction, and the second rotation direction is opposite to the first rotation direction (the rotation direction of the thrust plate). When the rotor drives the thrust plate to rotate at high speed, negative pressure is generated to suck out the hot air at one end and discharge it to the outside, thereby increasing the gas flow rate entering, realizing active ventilation and heat exchange of the thrust plate itself, accelerating gas flow, saving energy consumption, improving heat dissipation performance and improving energy efficiency.

[0098] To facilitate negative pressure air intake, the air inlet through the inner ring is oriented in the opposite direction of rotation. The air inlet is circumferentially at an angle greater than 90° to the rotational direction, and the air outlet is radially at an angle greater than 90° to the rotational direction. There are no specific requirements for the hole shape; for ease of machining and processing, circular, rectangular, or elliptical holes are preferred.

[0099] In some embodiments,

[0100] There are multiple first thrust plate air inlet holes 01, and the multiple first thrust plate air inlet holes 01 are arranged at intervals along the circumferential direction of the thrust plate 3, and the extension direction of each first thrust plate air inlet hole 01 from one axial end face to the other axial end face is toward the second rotation direction, which is opposite to the first rotation direction of the thrust plate 3.

[0101] The present invention proposes a magnetic levitation rotating machine (preferably a blower) with active and efficient heat dissipation. The thrust plate adopts a Y-shaped inclined hole scheme to achieve its own active suction heat exchange through high rotation speed, increase the gas flow rate, accelerate the cooling of the axial magnetic bearing, and at the same time cooperate with the overall active pure air cooling of the magnetic levitation rotating machine. The coaxial impeller at the other end of the main impeller is used for cooling, or the rotor is rotated by negative pressure cooling, or the main impeller is used for cooling. The traditional external passive heat dissipation is changed to internal active heat dissipation, which improves the heat dissipation efficiency while reducing the heat dissipation cost. This cooling scheme of magnetic levitation rotating machinery 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, thereby improving the stability of the magnetic levitation system.

[0102] In some embodiments,

[0103] The axial stator 2 includes a radial outer portion 21 and a radial inner portion 22. The radial outer portion 21 and the radial inner portion 22 are spaced apart in the radial direction of the axial stator 2, and a coil slot 23 is formed therebetween. A coil 2 5' is arranged in the coil slot 23. The second thrust plate air inlet hole 02 is located at one end of the other axial end surface of the thrust plate 3 and is opposite to the position of the coil slot 23 in the axial direction. The one end of the second thrust plate air inlet hole 02 is not opposite to the magnetic pole position of the axial stator 2;

[0104] The second axial stator 2 further includes a second axial outer portion 24. The second axial outer portion 24 is arranged in the axial direction of the magnetic bearing relative to the second coil 5' and away from the thrust plate 3.

[0105] A bearing stator ventilation hole 2 03 ′ is provided on the axial outer portion 24 of the axial stator 2. The bearing stator ventilation hole 2 03 ′ extends from one axial end surface of the axial outer portion 24 to the other axial end surface. The bearing stator ventilation hole 2 03 ′ can communicate with the second thrust plate air inlet hole 02.

[0106] The motor rotor flow channel 25 is communicated with the bearing stator ventilation hole 1 03 or the bearing stator ventilation hole 2 03 ′.

[0107] The present invention further arranges the air inlet of the second thrust disk so that the position of the other axial end face of the thrust disk is not opposite to the magnetic pole position of the axial stator 2, so that the end face of the thrust disk is not punched at the position facing the magnetic pole of the axial stator 2, so that the cooling air cannot directly reach the magnetic pole gap position of the axial stator 2, which can further effectively avoid the cooling gas and the opening from affecting the magnetic furnace structure, further avoid the insufficient axial supporting force of the magnetic suspension, further achieve the improvement of heat dissipation and cooling of the magnetic suspension bearing, and avoid the influence on the magnetic suspension magnetic circuit, further improve the magnetic suspension supporting force, and also have The invention effectively reduces the influence of gas force on axial force; the invention also provides a bearing stator ventilation hole one on the axial outer side one, and the bearing stator ventilation hole one can be connected with the first thrust plate air inlet hole, thereby providing an air flow channel, further accelerating the gas flow in the axial stator coil slot cavity, and realizing effective autonomous heat dissipation of the axial coil and the thrust plate; and the bearing stator ventilation holes one and two of the invention are connected with the motor rotor flow channel, thereby providing two gas flow channels to dissipate heat for the magnetic levitation bearing and the motor stator respectively, thereby further improving the cooling and heat dissipation efficiency of the magnetic levitation rotating machinery.

[0108] In some embodiments,

[0109] Inside the second coil slot 23, a fifth gap is provided between the radial inner side of the second coil 5' and the second radial inner portion 22, forming a second gas flow path 08.

[0110] Inside the second coil slot 23, a sixth gap is also provided between the second axially outer portion 24 and the second coil 5', forming a second bearing stator ventilation slot 04';

[0111] The bearing stator ventilation hole 2 03 ′ is connected to the bearing stator ventilation slot 2 04 ′, and is further connected to the second thrust plate air inlet hole 02 through the second gas flow path 08 .

[0112] The present invention is provided with two bearing stator ventilation holes on the second axial outer portion, and two stator ventilation slots and a gas flow path in the axial stator coil slot, which can form multiple gas flow paths flowing from both sides toward the thrust plate ventilation holes of the middle thrust plate, and can further accelerate the gas flow in the axial stator coil slot cavity, thereby realizing effective autonomous heat dissipation of the axial coil and the thrust plate.

[0113] In some embodiments,

[0114] The second cover plate 4' is located between the second axial stator 2 and the thrust plate 3, and one axial end surface of the second cover plate 4' is connected to the second radial outer portion 21 of the second axial stator 2, and the other axial end surface of the second cover plate 4' is opposite to the thrust plate 3;

[0115] The magnetic pole position of the axial stator 2 includes the part of the cover plate 2 4' opposite to the thrust plate 3, and the part of the radial inner part 2 22 opposite to the thrust plate 3. There is a fourth gap 07 between the cover plate 2 4' and the radial inner part 2 22. The second thrust plate air inlet hole 02 is opposite to the fourth gap 07 in the axial direction, and the radial dimension of the fourth gap 07 is greater than or equal to the radial dimension of the second thrust plate air inlet hole 02.

[0116] The present invention also preferably arranges the second thrust plate air inlet hole between the upper and lower magnetic poles of the axial stator 2, directly opposite the coil, and the aperture size is ≤ the radial spacing between the upper and lower magnetic poles of the axial stator, so that the second thrust plate air inlet hole can further effectively avoid the magnetic pole position, further avoiding the impact on the magnetic circuit, and the thrust plate ventilation hole is connected with the ventilation paths at both ends without obstruction, and can also make the airflow resistance at both ends of the thrust plate small and the fluidity good; and the bearing stator ventilation hole 2, the bearing stator ventilation slot 2, the second gas flow path, the second gap and the second thrust plate air inlet hole are connected in sequence to form an airflow flow channel.

[0117] In some embodiments,

[0118] In each radial cross-section of the thrust plate 3, the cross-sectional area of ​​the magnetic path flow position of the axial stator 2 2 = the radial cross-sectional area of ​​the relative portion of the thrust plate and the axial stator 2 2 - the cross-sectional area of ​​the thrust plate ventilation hole - the cross-sectional area of ​​the thrust plate air outlet hole 09 ≥ the cross-sectional area of ​​the magnetic pole position of the axial stator 2 2.

[0119] The present invention further provides a thrust plate ventilation hole between the upper and lower magnetic poles of the axial stator 2, directly opposite the coil, so that the aperture size of the thrust plate ventilation hole is ≤ the radial spacing between the upper and lower magnetic poles of the axial stator 2, which can enable the thrust plate ventilation hole to further effectively avoid the magnetic pole position of the axial stator 2, further avoiding the impact on the magnetic circuit, and the thrust plate ventilation hole is connected to the ventilation paths at both ends without obstruction, and can also make the airflow resistance at both ends of the thrust plate small and the fluidity good.

[0120] In some embodiments,

[0121] Along the axial direction of the thrust plate 3, the second thrust plate air inlet hole 02 is an inclined hole structure whose extension direction is not parallel to the axis of the thrust plate 3. When observing from the other axial end face of the thrust plate 3 toward one axial end face thereof, the rotation direction of the thrust plate 3 is toward the third rotation direction, and the extension direction of the second thrust plate air inlet hole 02 from the other axial end face to the one axial end face is toward the fourth rotation direction, and the fourth rotation direction is opposite to the third rotation direction.

[0122] The present invention also arranges the air inlet of the second thrust disk so that the extension direction from the other axial end face to the one axial end face is toward the fourth rotation direction, and the fourth rotation direction is opposite to the third rotation direction (the rotation direction of the thrust disk). 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, thereby increasing the flow rate of the incoming gas, realizing active ventilation and heat exchange of the thrust disk itself, accelerating the gas flow, saving energy consumption, improving heat dissipation performance and improving energy efficiency.

[0123] Along the direction from one axial end face to the other axial end face, the first rotation direction is the third rotation direction, and the fourth rotation direction is the same as the second rotation direction. The first and second thrust plate air inlet holes and the thrust plate air outlet holes together form a Y-shaped inclined hole, and air enters the middle from both sides and is discharged through the thrust plate air outlet holes.

[0124] To facilitate negative pressure air intake, the direction of the inner ring air inlet is opposite to the direction of rotation. The air inlet is circumferentially greater than 90° from the direction of rotation, and the air outlet is radially oriented at ≥90° from the direction of rotation. There are no specific requirements for the hole shape; for ease of machining and processing, circular, rectangular, or elliptical holes are preferred.

[0125] In some embodiments,

[0126] There are multiple second thrust plate air inlet holes 02, and the multiple second thrust plate air inlet holes 02 are arranged at intervals along the circumferential direction of the thrust plate 3, and the extension direction of each second thrust plate air inlet hole 02 from the other axial end face to the one axial end face is toward the fourth rotation direction, which is opposite to the third rotation direction of the thrust plate 3.

[0127] In some embodiments,

[0128] The first thrust plate air inlet hole 01, the thrust plate air outlet hole 09 and the second thrust plate air inlet hole 02 correspond to each other one by one, forming a group of air outlet units. There are multiple groups of air outlet units, and the multiple groups of air outlet units are arranged at intervals along the circumferential direction of the thrust plate 3.

[0129] The present invention can increase the air flow area and flow rate in the circumferential direction by disposing a plurality of air outlet units, thereby further improving the cooling and heat dissipation effect of the magnetic suspension bearing.

[0130] In some embodiments,

[0131] The thrust plate 3 has a minimum axial width of N for the magnetic circuit flow area when magnetic saturation is achieved, and the axial aperture of the thrust plate air outlet 09 is calculated as the axial thickness of the thrust plate 3 minus N. In the present invention, the thrust plate preferably has a minimum axial width of N for the magnetic circuit flow area when magnetic saturation is achieved, and the axial aperture of the air outlet is calculated as the thrust plate thickness minus N. This effectively ensures maximum heat dissipation while not affecting axial magnetic circuit conduction.

[0132] In some embodiments,

[0133] The outer periphery of the axial stator 1 and the axial stator 2 2 also has a cylinder 6, and the position of the cylinder 6 opposite to the thrust plate air outlet 09 of the thrust plate 3 is also provided with a bearing air outlet 26, which can be used to connect with the thrust plate air outlet 09 and exhaust outward.

[0134] The present invention provides a bearing air outlet on the outermost cylinder, which is opposite to the thrust plate air outlet and can guide the gas discharged from the thrust plate air outlet hole, so that the gas entering from the first and second thrust plate air inlet holes on both sides is discharged from the bearing air outlet after cooling the coil, rotor and other structures of the magnetic levitation bearing, thereby ensuring the smooth flow of gas and improving the cooling effect.

[0135] The axial magnetic bearing of the present invention preferably adopts active ventilation cooling. The thrust plate is installed on the rotor. Oblique holes are drilled on both sides of the thrust plate facing the axial bearing ventilation groove near the inner ring to the middle, and then holes are drilled upward to the outer ring surface of the thrust plate. Several Y-shaped oblique holes are opened circumferentially on the thrust plate facing the axial bearing ventilation groove. The air intake direction is opposite to the rotation direction of the rotor. When the thrust plate is driven by the rotor to rotate at high speed, negative pressure is generated to suck out the hot air at one end and discharge it to the outside, thereby increasing the gas flow rate introduced, realizing active ventilation and heat exchange of the thrust plate itself, and at the same time cooperating with the ventilation holes and ventilation grooves in the axial stator coil slots to accelerate the gas flow in the axial bearing cavity area, thereby realizing effective autonomous heat dissipation of the axial magnetic bearing.

[0136] According to the principle of axial magnetic bearings, the thrust plate's relative position to the axial magnetic poles represents the output position. This means that holes should not be drilled in the thrust plate's end face directly opposite the magnetic poles to prevent insufficient axial force. This also prevents cooling air from directly reaching the magnetic pole gap, minimizing the impact of gas reaction on the axial force. Therefore, magnetic bearings require that cooling holes not directly face the magnetic pole gap. To ensure that magnetic field saturation does not occur at other locations before the magnetic poles, the cross-sectional area of ​​the magnetic path must be greater than or equal to the cross-sectional area of ​​the magnetic poles in the radial circumferential direction. The air inlet is located between the upper and lower axial magnetic poles, directly opposite the coil. The aperture should be ≤ the radial spacing between the upper and lower axial stator magnetic poles. In each radial circumferential direction, the cross-sectional area of ​​the magnetic path must be equal to the radial cross-sectional area of ​​the thrust plate minus the cross-sectional area of ​​the hole in the same direction, ≥ the cross-sectional area of ​​the magnetic poles. The thrust plate should ideally have a minimum axial width N for the magnetic path area to achieve magnetic saturation, and the axial aperture of the air outlet should be equal to the thickness of the thrust plate minus N. This ensures maximum heat dissipation while maintaining axial magnetic path conductivity. To facilitate negative pressure air intake, the direction of the inner ring air inlet is opposite to the direction of rotation. The air inlet is circumferentially greater than 90° from the direction of rotation, and the air outlet is radially oriented at ≥90° from the direction of rotation. There are no specific requirements for the hole shape; for ease of machining and processing, circular, rectangular, or elliptical holes are preferred.

[0137] The entire system uses an active pure air-cooled cooling system. The cold air is driven by the coaxial impeller at the other end of the main impeller, or the rotor rotates to centrifugally intake air, or the main impeller leaks air. No additional heat dissipation drive motor is required. The cooling cold air flow rate is adjusted by the motor speed, and no additional controller is required. The overall internal flow channel layout guides the cold air to each component for targeted heat dissipation. The entire cooling system has a simple structure and the heat dissipation process is efficient and reliable.

[0138] In some embodiments,

[0139] The rotor 6 further includes a rear end cover 120, a cooling impeller 10, a rear housing 130, and a rear radial bearing 140. The cooling impeller 10 is 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. A first air inlet 121 is axially penetrated along the central axis of the rear end cover 120. The first air inlet 121 faces the cooling impeller 10. The magnetic bearing and the motor stator are both located inside the cylinder 19.

[0140] The rear housing 130 is axially connected between the rear end cover 120 and the barrel 19, and a rear housing flow channel 220 is axially provided on the rear housing 130. One end of the rear housing flow channel 220 can communicate with the motor rotor flow channel 25, and the other end of the rear housing flow channel 220 can communicate with the impeller air outlet 210 of the cooling impeller 10.

[0141] The airflow can enter the motor rotor flow channel 25 through the first air inlet 121 , the cooling impeller 10 , the interior of the rear end cover 120 and the rear housing flow channel 220 in sequence.

[0142] This is the structure of the magnetic levitation rotating machinery of the present invention located on the axial side of the magnetic levitation bearing, including the rear end cover for air intake, the rear housing, the rear radial bearing and the cooling impeller structure. The cooling impeller can suck gas into the interior of the rear end cover from the first air inlet through the integral rotation of the rotor, and supply it to the motor rotor flow channel respectively through the rear housing flow channel, and then supply it to the motor stator flow channel and the magnetic levitation bearing respectively through the motor rotor flow channel, thereby improving the air flow path, increasing the heat dissipation area of ​​the motor stator and rotor parts, and improving the cooling and heat dissipation performance.

[0143] In some embodiments,

[0144] It also 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 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 an accommodating space is formed between the front end cover 20 and the front housing 18.

[0145] A volute 31 is provided on the outer periphery of the front end cover 20, and a main impeller 30 is provided on the other axial end of the rotor 6. The main impeller 30 is located in the volute 31. A second air inlet 311 is provided at the central axis of the volute 31. The second air inlet 311 is directly opposite to the main impeller 30. A leakage channel 29 is provided between the main impeller 30 and the front end cover 20, and a front end cover flow channel is provided between the front end cover 20 and the outer periphery of the rotor 6.

[0146] The second air inlet 311, the main impeller 30, the leakage channel 29, the front cover flow channel, the accommodating space, the front housing flow channel, the front radial bearing flow channel and the air channel of the magnetic bearing are connected in sequence, and then exhausted through the bearing air outlet 26;

[0147] The inner and outer circumferential walls of the cylinder 19 are penetrated by a motor air outlet 28 , which is opposite to and connected to the motor stator flow channel 230 , so that the motor rotor flow channel 25 , the motor stator flow channel 230 and the motor air outlet 28 are connected in sequence.

[0148] This is the structure of the magnetic levitation rotating machinery of the present invention located on the other axial side of the magnetic levitation bearing, including the main impeller for air intake, the front cover, the front casing, the front radial bearing, etc. The gas sucked in by the main impeller can be used to exchange heat with the front radial bearing and the magnetic levitation bearing. The gas entering the second air inlet exchanges heat with the magnetic bearing, and then enters the magnetic bearing for heat exchange with a part of the gas through the motor rotor flow channel from the first air inlet, and merges and is discharged from the bearing outlet. The other part of the gas passing through the motor rotor flow channel passes through the motor stator flow channel to dissipate heat to the stator and is then discharged through the motor outlet, thereby forming multiple flow paths for dissipating heat to the magnetic bearing and the motor, which can further improve the cooling and heat dissipation performance of the magnetic levitation machinery.

[0149] Figure 4The figure shows the cooling flow path scheme of the magnetic levitation rotating machinery of the present invention (preferably a blower, etc.), which adopts an active pure air-cooling 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 30 is assembled at the front end of the rotor, and the cooling impeller 10 is assembled at the rear end of the rotor. The rear radial bearing 14 is located between the cooling impeller 10 and the motor stator 15, and the front radial bearing 17 and the axial bearing are respectively located between the main impeller 30 and the motor stator 15. The rear casing is equipped with a guide plate 11 and a rear end cover 12 for guiding the cooling impeller to increase airflow conduction and reduce flow resistance, and several corresponding ventilation holes or ventilation slots are opened on the rear casing 13, the cylinder 19, the front casing 18, the radial bearing, the axial bearing and other parts to facilitate airflow conduction. The cooling gas dissipates heat in three ways. The first way: first cool the rear radial bearing 14 and then cool the rotor through the motor rotor flow channel 25 The gas leaked from the main impeller 30 reaches the cavity area between the front casing 18 and the front end cover 20 through the back leakage channel 29, cools the front radial bearing 17 after passing through the gap between the rotor 16 and the front casing 18, and then passes through the bearing stator ventilation hole 03 (or bearing stator ventilation hole 2 03') and the thrust plate Y-type inclined hole to cool the axial bearing and thrust plate 3, and finally is discharged from the bearing outlet 26 on the cylinder 19. The gas leaked from the main impeller 30 reaches the cavity area between the front casing 18 and the front end cover 20 through the back leakage channel 29, cools the front radial bearing 17 after passing through the gap between the rotor 16 and the front casing 18, and then passes through the bearing stator ventilation hole 03 (or bearing stator ventilation hole 2 03') and the thrust plate Y-type inclined hole to cool the axial bearing and thrust plate 3, and finally is discharged from the bearing outlet 26 on the cylinder 19. This flow channel structure arrangement utilizes the leakage of the main impeller and the cooling impeller airflow to effectively cool the motor stator, rotor, radial bearings, axial bearings and other heat-generating components. At the same time, Y-shaped inclined holes are provided on the thrust plate of the high-heat-generating components to use negative pressure to suck out the hot air through the Y-shaped inclined hole flow channel, thereby achieving effective ventilation and cooling of the entire heat-generating components of the blower. The entire heat dissipation system has a simple structure, the heat dissipation process is efficient and reliable, and the stability of the magnetic levitation system is improved.

[0150] The beneficial effects of the present invention are as follows:

[0151] 1. This invention provides Y-shaped inclined holes on the thrust plate for high-heat-generating components. Negative pressure is used to draw heat out through the Y-shaped inclined hole flow channel. Inclined holes are drilled on both sides of the thrust plate between the two magnetic poles until they converge in the middle. Further inclined holes are drilled upward to the outer ring surface of the thrust plate. A through hole on the inner ring surface of the axial stator cooperates with the Y-shaped hole air inlet of the thrust plate, enabling active cooling and accelerating heat dissipation, increasing cooling flow, and not affecting the axial magnetic circuit.

[0152] 2. The present invention provides an integrated, efficient, pure air-cooled heat dissipation system. The active pure air-cooled heat dissipation system reduces heat dissipation costs. Targeted ventilation of heat-generating components can effectively accelerate cooling and improve reliability. It can ensure that the magnetic levitation rotating machinery has sufficient heat dissipation air volume under various working conditions. The cold air is directly driven by the motor rotor, the control logic is simple, and the heat dissipation system has high reliability.

[0153] The present invention also 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.

[0154] Figure 1 The figure shows the internal axial bearing cooling path of the magnetic levitation rotating machine (preferably a blower) of the present invention. The three oblique holes (first thrust plate air inlet 01 (oblique hole), second thrust plate air inlet 02 (oblique hole), and thrust plate air outlet 09 (oblique hole)) form a Y-shaped thrust plate oblique hole. The thrust plate Y-shaped hole air inlet is located axially between the inner and outer magnetic poles, directly opposite the coil, corresponding to the wire slot ventilation point. Ventilation slots and ventilation holes are provided in the axial stator, and the ventilation holes connect the ventilation slots. The ventilation slots (first and second gas flow paths) are radial, annular, or spiral in shape. This cooling path follows: Cooling gas flows through bearing stator ventilation hole 1 03 (bearing stator ventilation hole 2 03') → bearing stator ventilation slot 1 04 (bearing stator ventilation slot 2 04') → first gas flow path 06 (second gas flow path 08) → first gap 05 (fourth gap 07), then converges through the first thrust plate air inlet hole 01 and the second thrust plate air inlet hole 02 on both sides of the thrust plate, and is discharged through the thrust plate air outlet hole 09, effectively dissipating heat from the axial stator and axial windings. During operation, the air intake direction of the first and thrust plate inclined air inlet holes rotates in the opposite direction of the rotor rotation. Negative pressure is used to draw air from the ventilation grooves into the thrust plate inclined holes before being discharged for heat dissipation. This cooling path achieves effective self-dissipating heat dissipation. In order to make the thrust plate take in negative pressure air, the air intake direction must always be opposite to the rotor rotation direction. Therefore, the rotation direction of the thrust plate inclined hole is related to the thrust plate air intake direction and the rotor rotation direction. If the rotation direction of the air intake rotor at the left end of the thrust plate is clockwise when viewed from the right end, the thrust plate is a right-handed inclined hole. If the rotation direction of the air intake rotor at the left end of the thrust plate is counterclockwise when viewed from the right end, it is a left-handed inclined hole. The same applies vice versa. If the directions do not match, the heat dissipation effect will be weakened and the heat dissipation efficiency will be reduced.

[0155] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention. The above description is merely a preferred embodiment of the present invention. It should be noted that those skilled in the art can make various improvements and variations without departing from the technical principles of the present invention, and such improvements and variations shall also be considered within the scope of protection of the present invention.

Claims

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

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

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

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

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

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

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

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

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

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

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

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

14. The magnetic levitation rotating machine according to any one of claims 1 to 13, characterized in that: The thrust disk (3) has a minimum axial width of a magnetic circuit flow area of ​​N when magnetic saturation is satisfied, and the axial aperture of the thrust disk air outlet hole (09) is equal to the axial thickness of the thrust disk (3) - N.

15. The magnetic levitation rotating machine according to any one of claims 1 to 13, characterized in that: The outer periphery of the axial stator 1 (1) and the axial stator 2 (2) further comprises a cylinder (19), and a bearing air outlet (26) is further provided at a position of the cylinder (19) opposite to the thrust plate air outlet (09) of the thrust plate (3), which can be used to connect with the thrust plate air outlet (09) and exhaust air outward.

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

17. The magnetic levitation rotating machine according to claim 16, characterized in that: It also includes a front radial bearing (17), a front housing (18) and a front end cover (20), wherein the front radial bearing (17) and the front housing (18) are both located on an axial side of the magnetic bearing away from the motor stator, 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 an axial side of the cylinder (19) away from the rear end cover (120), and an accommodating space is formed between the front end cover (20) and the front housing (18); A volute (31) is provided on the outer periphery of the front end cover (20), a main impeller (30) is provided at the other axial end of the rotor (6), the main impeller (30) is located in the volute (31), a second air inlet (311) is provided at the central axis of the volute (31), the second air inlet (311) is directly opposite to the main impeller (30), a leakage channel (29) is provided between the main impeller (30) and the front end cover (20), and a front end cover flow channel is provided between the front end cover (20) and the outer periphery of the rotor (6). The second air inlet (311), the main impeller (30), the leakage channel (29), the front cover flow channel, the accommodating space, the front housing flow channel, the front radial bearing flow channel and the air channel of the magnetic suspension bearing are connected in sequence, and then exhaust is discharged through the bearing air outlet (26); The inner and outer peripheral walls of the cylinder (19) are provided with a motor air outlet (28) extending therethrough. The motor air outlet (28) is opposite to and communicates with the motor stator flow channel (230), so that the motor rotor flow channel (25), the motor stator flow channel (230) and the motor air outlet (28) are sequentially communicated.

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