A magnetic levitation rotating machine

Abstract

The present invention provides a magnetic levitation rotating machine, a magnetic levitation bearing, a motor stator, and a rotor, wherein a rotor inlet flow channel and a rotor exhaust flow channel are provided inside the rotor; in the axial direction, a thrust disc is provided between axial stator 1 and axial stator 2, and a first thrust disc ventilation hole is provided on the thrust disc from its axial end face to its axial end face; the axial stator 1 includes a radial outer portion 1 and a radial inner portion 1; one end of the first thrust disc ventilation hole located on the axial end face of the thrust disc is located between the radial inner portion 2 of the axial stator 2 and the rotor; one end of the first thrust disc ventilation hole located on the axial end face of the thrust disc is opposite to the position of the coil slot 1 in the axial direction, and the first thrust disc ventilation hole is not opposite to the magnetic pole position of the axial stator 1. According to the present invention, while improving the heat dissipation and cooling of the magnetic levitation bearing, it can also avoid 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, magnetic levitation blowers primarily dissipate heat through external cooling equipment, typically an external cooling fan, water cooling system, and heat exchanger. This results in high maintenance costs, complex structural systems, and increased safety risks. Alternatively, negative pressure is used to draw heat out of the blower, which fails to effectively dissipate heat from internal components. In particular, the axial magnetic bearings suffer from inadequate heat dissipation, impacting the stable operation of the magnetic levitation 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 both the motor stator flow channel and the motor rotor flow channel can circulate gas; the magnetic bearing is located on one axial side of the motor stator and can support the rotor; a rotor inlet flow channel is provided inside the rotor, and a rotor exhaust flow channel is further provided on the rotor, one end of the rotor inlet flow channel can be communicated with an external air intake, and the other end is communicated with the rotor exhaust flow channel, and the rotor exhaust flow channel is located between the magnetic bearing and the motor stator;

[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 first thrust plate ventilation hole is provided on the thrust plate from its first axial end surface to its other axial end surface. 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 second axial stator includes a second radial outer portion and a second radial inner portion.

[0010] One end of the first thrust plate ventilation hole located on the other axial end surface of the thrust plate is located between the radial inner portion 2 of the axial stator 2 and the rotor, and one end of the first thrust plate ventilation hole located on the one axial end surface of the thrust plate is opposite to the position of the coil slot 1 in the axial direction, and the first thrust plate ventilation hole is not opposite to the magnetic pole position of the axial stator 1;

[0011] The rotor exhaust flow channel can be communicated with the first thrust plate ventilation hole, the motor stator flow channel and the motor rotor flow channel respectively.

[0012] In some embodiments,

[0013] The first pressure plate is located between the first axial stator and the thrust plate, and an axial end surface of the first pressure plate is in contact with the radial outer portion of the first axial stator, and the other axial end surface of the first pressure plate is opposite to the thrust plate;

[0014] The magnetic pole position of the axial stator 1 includes a portion of the pressure 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 pressure plate 1 and the radial inner portion 1, the first thrust disk ventilation 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 an 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 plate, the cross-sectional area of ​​the magnetic path flow position of the axial stator 1 = the radial cross-sectional area of ​​the opposing portion of the thrust plate and the axial stator 1 - the cross-sectional area of ​​the ventilation hole of the first thrust plate ≥ the cross-sectional area of ​​the magnetic pole position of the axial stator 1.

[0017] In some embodiments,

[0018] 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.

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

[0020] A bearing stator ventilation hole 1 is provided on the axial outer portion 1 of the axial stator 1. The bearing stator ventilation hole 1 extends from one axial end surface of the axial outer portion 1 to the other axial end surface thereof to communicate with the bearing stator ventilation groove 1, and further communicates with the first thrust plate ventilation hole through the first gas flow path.

[0021] The rotor exhaust flow channel is connected to the bearing stator ventilation hole through the first thrust plate ventilation hole.

[0022] In some embodiments,

[0023] Along the axial direction of the thrust plate, the first thrust plate ventilation hole is an inclined hole structure whose extension direction is not parallel to the axis of the thrust plate. When observing from the axial end face of the air inlet side of the thrust plate toward the axial end face of the air outlet side, the rotation direction of the thrust plate is toward the first rotation direction. The extension direction of the first thrust plate ventilation hole from the axial end face of the air inlet side of the thrust plate toward the axial end face of the air outlet side is toward the second rotation direction, and the second rotation direction is opposite to the first rotation direction.

[0024] In some embodiments,

[0025] There are multiple ventilation holes in the first thrust plate, and the multiple ventilation holes are arranged at intervals along the circumferential direction of the thrust plate. The extension direction of each ventilation hole from the axial end face of the air inlet side of the thrust plate to the axial end face of the air outlet side is toward the second rotation direction, which is opposite to the first rotation direction of the thrust plate.

[0026] In some embodiments,

[0027] A second thrust plate ventilation hole is provided on the thrust plate from the other axial end surface to the one axial end surface thereof, and the second thrust plate ventilation hole is offset from the first thrust plate ventilation hole and is not connected;

[0028] The radially outer portion 2 and the radially inner portion 2 are spaced apart in the radial direction of the axial stator 2, and a coil slot 2 is formed therebetween, a coil 2 is arranged in the coil slot 2, one end of the second thrust plate ventilation hole located on the one axial end surface of the thrust plate is located between the radially inner portion 1 of the axial stator 1 and the rotor, one end of the second thrust plate ventilation hole located on the other axial end surface of the thrust plate is opposite to the position of the coil slot 2 in the axial direction, and the second thrust plate ventilation hole is not opposite to the magnetic pole position of the axial stator 2;

[0029] The rotor exhaust flow channel can also be communicated with the second thrust plate ventilation hole.

[0030] In some embodiments,

[0031] The second pressure plate is located between the second axial stator and the thrust plate, and one axial end surface of the second pressure plate is in contact with the second radial outer portion of the second axial stator, and the other axial end surface of the second pressure plate is opposite to the thrust plate;

[0032] The magnetic pole position of the axial stator 2 includes the part of the pressure 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 pressure plate 2 and the radial inner part 2. The second thrust plate ventilation 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 end of the second thrust plate ventilation hole opposite to the coil slot 2.

[0033] In some embodiments,

[0034] 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 ventilation hole of the second thrust plate ≥ the cross-sectional area of ​​the magnetic pole position of the axial stator 2.

[0035] In some embodiments,

[0036] 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.

[0037] The second axial stator further includes a second axial outer portion, which is arranged in the axial direction of the magnetic bearing relative to the second coil and away from the thrust plate. Inside the second coil slot, a sixth gap is also formed between the second axial outer portion and the second coil to form a second bearing stator ventilation slot;

[0038] 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 thereof to communicate with the second bearing stator ventilation groove and further communicate with the second thrust plate ventilation hole through the second gas flow path.

[0039] The rotor exhaust flow channel is connected to the second thrust plate ventilation hole through the bearing stator ventilation hole 2.

[0040] In some embodiments,

[0041] Along the axial direction of the thrust plate, the second thrust plate ventilation hole is an inclined hole structure whose extension direction is not parallel to the axis of the thrust plate. When observing from the axial end face of the air inlet side of the thrust plate toward the axial end face of the air outlet side, the rotation direction of the thrust plate is toward the third rotation direction. The extension direction of the second thrust plate ventilation hole from the axial end face of the air inlet side of the thrust plate toward the axial end face of the air outlet side is toward the fourth rotation direction, and the fourth rotation direction is opposite to the third rotation direction.

[0042] In some embodiments,

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

[0044] In some embodiments,

[0045] The motor further comprises a cylinder, a rear end cover, a rear housing, and a rear radial bearing, wherein one axial end of the rotor is provided with a rotor inlet passage in the axial direction toward the interior of the rotor, and an end of the rotor inlet passage opposite to the rear end cover is formed as an air inlet, and the magnetic bearing and the motor stator are both located inside the cylinder;

[0046] The rear end cover is arranged at one axial end of the cylinder, the rear housing is located inside the cylinder and connected to the rear end cover, and the rear radial bearing is located inside the cylinder;

[0047] A motor air outlet is provided through the inner and outer circumferential walls of the cylinder. The motor air outlet is located between the motor stator and the rear radial bearing in the axial direction. The motor stator flow channel and the motor rotor flow channel are respectively connected to the motor air outlet.

[0048] In some embodiments,

[0049] 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;

[0050] The inner and outer circumferential walls of the cylinder are also provided with bearing air outlets, which are opposite to and connected to the accommodating space; so that the air channel of the magnetic levitation bearing, the front radial bearing flow channel, the front shell flow channel, the accommodating space and the bearing air outlet are connected in sequence.

[0051] The magnetic levitation rotating machine provided by the present invention has the following beneficial effects:

[0052] 1. The present invention realizes its own active air suction heat exchange through high rotation speed through the first and / or second thrust plate ventilation holes opened on the thrust plate, 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, and improves the cooling and heat dissipation effect of the magnetic suspension bearing, and the end of the first thrust plate ventilation hole opposite to the coil slot one is not opposite to the magnetic pole position of the axial stator one (the end of the second thrust plate ventilation hole is not opposite to the magnetic pole position of the axial stator two), so that the end face of the thrust plate is not punched at the position facing the magnetic pole, 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 the magnetic suspension axial support. The force is insufficient, and the heat dissipation and cooling of the magnetic suspension bearing can be improved while avoiding the impact on the magnetic suspension magnetic circuit, ensuring sufficient magnetic suspension supporting force, and effectively reducing the impact of the gas force on the axial force; the present invention also preferably extends the first thrust plate ventilation hole from one end of the thrust plate located between the axial stator and the rotor to the other end of the thrust plate opposite to the coil slot one, which can cool the coil inside the stator, and the aperture size of the end opposite to the coil slot one is ≤ the radial spacing between the upper and lower magnetic poles of the axial 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, and can also make the airflow resistance at both ends of the thrust plate small and the fluidity good;

[0053] 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 cylinder from the inside of the rotor and then divides into three paths. One path cools the rotor from the motor rotor flow channel, and the second path cools the stator from the motor stator flow channel. After merging, the gas is discharged from the motor exhaust port in the rear cavity of the motor stator; the third path passes through the magnetic levitation axial bearing (thrust plate inclined hole + axial bearing stator ventilation hole), the front radial bearing, and the front shell before being discharged from the bearing outlet of the cylinder, thereby increasing the air flow area of ​​the magnetic levitation bearing, the motor stator, and the motor rotor, and further improving the cooling and heat dissipation efficiency and cooling and heat dissipation performance of the magnetic levitation machinery.

[0054] 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 relative part of the thrust disk and the axial stator 1 - the cross-sectional area of ​​the ventilation hole of the first thrust disk ≥ 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 suspension support force; the present invention further sets the ventilation hole of the thrust disk to extend from one axial end face to the other axial end face in the direction 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; at the same time, combined with the bearing stator ventilation holes and ventilation slots (multiple gas flow paths) in the axial stator coil slots, 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

[0055] Figure 1 is a longitudinal sectional view of a first embodiment of a magnetic bearing according to the present invention;

[0056] Figure 2 yes Figure 1 The planar structural diagram of the thrust plate structure (thrust plate ventilation hole with left-handed inclined hole);

[0057] Figure 3 is a longitudinal sectional view of a second embodiment of the magnetic bearing of the present invention;

[0058] Figure 4 yes Figure 3 The planar structural diagram of the thrust plate structure (thrust plate ventilation hole with right-handed inclined hole);

[0059] Figure 5This is a three-dimensional structural diagram of the axial stator 1 of the present invention;

[0060] Figure 6 It is a longitudinal sectional view of the magnetic levitation rotating machine of the present invention.

[0061] The reference numerals indicate:

[0062] 1. Axial stator 1; 11. Radial outer portion 1; 12. Radial inner portion 1; 13. Coil slot 1; 14. Axial outer portion 1; 2. Axial stator 2; 21. Radial outer portion 2; 22. Radial inner portion 2; 23. Coil slot 2; 24. Axial outer portion 2; 3. Thrust plate; 4. Pressure plate 1; 4', Pressure plate 2; 5. Coil 1; 5', Coil 2; 6. Rotor; 120. Rear end cover; 130. Rear housing; 140. Rear radial bearing; 15. Motor stator; 17. Front radial bearing; 18. Front housing; 19. Cylinder; 20. Front end cover; 210. Rotor inlet flow channel; 220. Rotor exhaust flow channel; 230. Motor stator flow channel; 240. Motor rotor flow channel; 25. Bearing outlet; 26. Motor outlet

[0063] 01. First thrust plate ventilation hole; 02. Second thrust plate ventilation hole; 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. DETAILED DESCRIPTION

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] like Figure 1-6As shown, the present invention provides a magnetic levitation rotating machine, which includes:

[0071] 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 segment of the rotor 6, a motor stator flow channel 230 is axially opened on the motor stator, a rotor air gap exists between the rotor 6 and the motor stator to form a motor rotor flow channel 240 (i.e., a motor rotor flow channel is formed between the rotor and the stator), and both the motor stator flow channel 230 and the motor rotor flow channel 240 can circulate gas; the magnetic bearing is located on one axial side of the motor stator and can support the rotor 6; a rotor inlet flow channel 210 is provided inside the rotor 6, and a rotor exhaust flow channel 220 is also provided on the rotor 6, one end of the rotor inlet flow channel 210 can be communicated with the external air intake, and the other end is communicated with the rotor exhaust flow channel 220, and the rotor exhaust flow channel 220 is located between the magnetic bearing and the motor stator 15;

[0072] 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 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 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. A coil 5 is provided in the coil slot 13. The axial stator 2 includes a radial outer portion 21 and a radial inner portion 22.

[0073] 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 portion 22 of the axial stator 2 and the rotor 6. The 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 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.

[0074] The rotor exhaust flow channel 220 can be communicated with the first thrust plate ventilation hole 01, the motor stator flow channel 230 and the motor rotor flow channel 240 respectively.

[0075] The present invention realizes its own active air suction and heat exchange through high rotation speed through the first thrust disk ventilation hole opened on the thrust disk, increases the gas flow rate introduced, accelerates the cooling of the axial magnetic bearing, can actively cool the thrust disk itself and increase the cooling flow rate to accelerate the heat dissipation of the axial coil, and improves the cooling and heat dissipation effect of the magnetic suspension bearing, and the end of the first thrust disk ventilation hole opposite to the coil slot one is not opposite to the magnetic pole position of the axial stator one, so that the thrust disk end face is not punched at the position facing the magnetic pole, so that the cooling air cannot directly reach the magnetic pole gap position, and can effectively avoid the cooling gas and the opening from affecting the magnetic furnace structure, thereby avoiding insufficient axial supporting force of the magnetic suspension, achieving improved heat dissipation cooling of the magnetic suspension bearing while avoiding affecting the magnetic suspension magnetic circuit, ensuring sufficient magnetic suspension supporting force, and effectively reducing the influence of the gas force on the axial force;

[0076] 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 cylinder from the inside of the rotor and then divides into three paths. One path cools the rotor from the motor rotor flow channel, and the second path cools the stator from the motor stator flow channel. After merging, the gas is discharged from the motor exhaust port in the rear cavity of the motor stator; the third path passes through the magnetic levitation axial bearing (thrust plate inclined hole + axial bearing stator ventilation hole), the front radial bearing, and the front shell before being discharged from the bearing outlet of the cylinder, thereby increasing the air flow area of ​​the magnetic levitation bearing, the motor stator, and the motor rotor, and further improving the cooling and heat dissipation efficiency and cooling and heat dissipation performance of the magnetic levitation machinery.

[0077] In some embodiments,

[0078] The pressure plate 1 also includes a pressure plate 4, which is located between the axial stator 1 and the thrust plate 3, and an axial end surface of the pressure plate 4 is connected to the radial outer portion 11 of the axial stator 1, and the other axial end surface of the pressure plate 4 is opposite to the thrust plate 3;

[0079] The magnetic pole position of the axial stator 1 includes the portion of the pressure plate 4 opposite to the thrust disk 3, and the portion of the radial inner portion 12 opposite to the thrust disk 3. There is a first gap 05 between the pressure plate 4 and the radial inner portion 12. The first thrust disk ventilation hole 01 is opposite to the first gap 05 in the axial direction, and the radial dimension of the first gap 05 is greater than or equal to the radial dimension of the end of the first thrust disk ventilation hole 01 opposite to the coil slot 13.

[0080] The first thrust plate ventilation hole of the present invention extends from one end of the thrust plate located between the axial stator and the rotor to the other end of the thrust plate opposite to the coil slot one, which can cool and dissipate heat from the coil inside the stator, and the end of the first thrust plate ventilation hole opposite to the coil slot one is preferably arranged 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 enable the first thrust plate ventilation hole to further effectively avoid the magnetic pole position and further avoid affecting the magnetic circuit, and the first 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.

[0081] In some embodiments,

[0082] 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 first thrust disk ventilation hole 01 ≥ the cross-sectional area of ​​the magnetic pole position of the axial stator 1.

[0083] 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 relative portion of the thrust disk and the axial stator 1 - the cross-sectional area of ​​the ventilation hole of the first thrust disk ≥ the cross-sectional area of ​​the magnetic pole position of the axial stator 1, so that other magnetic circuit portions 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.

[0084] In some embodiments,

[0085] 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.

[0086] The axial stator 1 further includes an axial outer portion 14, which is arranged in the axial direction of the magnetic bearing relative to the coil 1 5 and away from the thrust plate 3. Inside the coil slot 13, a third gap is also defined between the axial outer portion 14 and the coil 1 5, forming a bearing stator ventilation slot 04.

[0087] 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 surface of the axial outer portion 14 to the other axial end surface thereof to communicate with the bearing stator ventilation groove 04 and further communicate with the first thrust plate ventilation hole 01 through the first gas flow path 06.

[0088] The rotor exhaust flow channel 220 is connected to the bearing stator ventilation hole 03 through the first thrust plate ventilation hole 01.

[0089] The present invention further achieves effective cooling and heat dissipation inside the bearing by arranging bearing stator ventilation holes and ventilation slots (multiple gas flow paths) in the axial stator coil slots, so that the rotor exhaust channel is connected to the bearing stator ventilation hole one through the first thrust plate ventilation hole, which can further accelerate the gas flow in the axial stator coil slot cavity and achieve effective autonomous heat dissipation of the axial coil and thrust plate.

[0090] In some embodiments,

[0091] Along the axial direction of the thrust disk 3, the first thrust disk ventilation hole 01 is an inclined hole structure whose extension direction is not parallel to the axis of the thrust disk 3. When observing from the axial end face of the air inlet side of the thrust disk 3 toward the axial end face of the air outlet side, the rotation direction of the thrust disk 3 is toward the first rotation direction, and the extension direction of the first thrust disk ventilation hole 01 from the axial end face of the air inlet side of the thrust disk toward the axial end face of the air outlet side is toward the second rotation direction, and the second rotation direction is opposite to the first rotation direction.

[0092] The present invention also arranges the ventilation hole of the first thrust plate to extend from the axial end face on the air inlet side toward the axial end face on the air outlet side in a 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.

[0093] In some embodiments,

[0094] 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, and the extension direction of each first thrust plate ventilation hole 01 from the axial end face on the air intake side to the axial end face on the air outlet side is toward the second rotation direction, which is opposite to the first rotation direction of the thrust plate 3.

[0095] The present invention proposes a magnetic levitation rotating machine (preferably a blower) with active and efficient heat dissipation. The first thrust plate ventilation hole adopts an inclined hole scheme to achieve its own active suction heat exchange through high rotation speed, increase the gas flow rate introduced, and accelerate the cooling of the axial magnetic bearing. At the same time, it cooperates with the overall active pure air cooling of the blower, utilizes the coaxial impeller cooling at the other end of the main impeller, or the rotor rotation negative pressure cooling, or the main impeller leakage cooling, and changes the previous external passive heat dissipation to internal active heat dissipation, thereby improving the heat dissipation efficiency and 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.

[0096] In some embodiments,

[0097] The thrust plate 3 is provided with a second thrust plate ventilation hole 02 extending from the other axial end surface to the one axial end surface thereof. The second thrust plate ventilation hole 02 is offset from the first thrust plate ventilation hole 01 and is not connected.

[0098] 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. One end of the second thrust plate ventilation hole 02 located on the one axial end surface of the thrust plate 3 is located between the radial inner portion 12 of the axial stator 1 and the rotor 6. One end of the second thrust plate ventilation hole 02 located on the other axial end surface of the thrust plate 3 is opposite to the position of the coil slot 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;

[0099] The rotor exhaust flow channel 220 can also be communicated with the second thrust plate ventilation hole 02.

[0100] The present invention further ensures that the end of the second thrust plate ventilation hole opposite to the coil slot 2 is not opposite to the magnetic pole position of the axial stator 2, so that the end face of the thrust plate is not punched at the magnetic pole position facing the axial stator 2, so that 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 insufficient axial supporting force of the magnetic suspension, further achieve improved heat dissipation and cooling of the magnetic suspension bearing, and avoid affecting the magnetic suspension magnetic circuit, further improve the magnetic suspension supporting force, and effectively reduce the influence of the gas force on the axial force.

[0101] In addition, the bearing stator ventilation holes one and two, and the first and second thrust plate ventilation holes of the present invention are respectively connected to the motor rotor flow channel, which can provide two gas circulation channels (X-type heat exchange channels) for dissipating heat from the magnetic levitation bearing, further improving the cooling and heat dissipation efficiency of the magnetic levitation bearing.

[0102] In some embodiments,

[0103] 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 in contact with 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;

[0104] The magnetic pole position of the axial stator 2 includes the part of the pressure 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 pressure plate 2 4' and the radial inner part 2 22. The second thrust plate ventilation 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 ventilation hole 02 and one end of the coil slot 2 23.

[0105] The second thrust plate ventilation hole of the present invention extends from one end of the thrust plate located between the axial stator and the rotor to the other end of the thrust plate opposite to the coil slot one, which can cool and dissipate heat from the coil inside the stator, and the end of the second thrust plate ventilation hole opposite to the coil slot two is preferably arranged 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 enable the second thrust plate ventilation hole to further effectively avoid the magnetic pole position and further avoid affecting the magnetic circuit, and the second 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.

[0106] In some embodiments,

[0107] 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 second thrust plate ventilation hole 02 ≥ the cross-sectional area of ​​the magnetic pole position of the axial stator 2 2.

[0108] The present invention further provides that the end of the second thrust plate ventilation hole opposite to the coil slot 2 is arranged between the upper and lower magnetic poles of the axial stator 2 and directly opposite the coil, further making the aperture size of this end of the second thrust plate ventilation hole ≤ the radial spacing between the upper and lower magnetic poles of the axial stator 2, so that the second thrust plate ventilation hole can further effectively avoid the magnetic pole position of the axial stator 2, further avoiding affecting the magnetic circuit, and the second 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.

[0109] In some embodiments,

[0110] 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.

[0111] 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. Inside the second coil slot 23, a sixth gap is also defined between the second axial outer portion 24 and the second coil 5', forming a bearing stator ventilation slot 204'.

[0112] 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 thereof to communicate with the bearing stator ventilation groove 2 04 ′ and further communicate with the second thrust plate ventilation hole 02 via the second gas flow path 08 .

[0113] The rotor exhaust flow channel 220 is connected to the second thrust plate ventilation hole 02 through the bearing stator ventilation hole 2 03 ′.

[0114] The present invention further provides bearing stator ventilation holes and ventilation slots (multiple gas flow paths) in the coil slots of the axial stator 2, so that the rotor exhaust channel is connected to the second thrust plate ventilation hole through the bearing stator ventilation hole 2, thereby achieving effective cooling and heat dissipation inside the bearing, and forming two gas flow channels (X-shaped heat exchange channels) for heat dissipation of the magnetic levitation bearing, which can further accelerate the gas flow in the coil slot cavity of the axial stator 2, and achieve effective autonomous heat dissipation of the axial coil and the thrust plate.

[0115] In some embodiments,

[0116] 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 the 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 the fourth rotation direction, and the fourth rotation direction is opposite to the third rotation direction.

[0117] The present invention also arranges the ventilation hole of the first thrust plate to extend from the axial end face on the air inlet side toward the axial end face on the air outlet side in a third rotation direction (which may 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 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.

[0118] In some embodiments,

[0119] There are multiple second thrust plate ventilation holes 02, and the multiple second thrust plate ventilation holes 02 are arranged at intervals along the circumferential direction of the thrust plate 3, and the extension direction of each second thrust plate ventilation hole 02 from the axial end face of the air inlet side of the thrust plate to the axial end face of the air outlet side is toward the fourth rotation direction, which is opposite to the third rotation direction of the thrust plate 3.

[0120] The present invention proposes a magnetic levitation rotating machine (preferably a blower) with active and efficient heat dissipation. The second thrust plate ventilation hole adopts an inclined hole scheme to achieve its own active suction heat exchange through high rotation speed, increase the gas flow rate introduced, and accelerate the cooling of the axial magnetic bearing. At the same time, it cooperates with the overall active pure air cooling of the blower, utilizes the coaxial impeller cooling at the other end of the main impeller, or the rotor rotation negative pressure cooling, or the main impeller leakage cooling, and changes the previous external passive heat dissipation to internal active heat dissipation, thereby improving the heat dissipation efficiency and 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.

[0121] The axial magnetic bearing of the present invention adopts active ventilation cooling. The thrust plate is installed on the rotor and has an oblique hole between the two magnetic poles of the thrust plate. The thrust plate is provided with several staggered X-shaped oblique holes from the inside to the outside and from the outside to the inside in the axial and radial spaces (in order to cooperate with the cooling scheme of the whole machine, only one air intake oblique hole can be provided for axial cooling). 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, accelerating the gas flow, and at the same time cooperating with the ventilation holes and ventilation slots in the axial stator coil slot to 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.

[0122] 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 where the thrust plate's end faces directly toward 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 forces on the axial force. To ensure that magnetic field saturation does not occur at other locations before the magnetic poles, the cross-sectional area of ​​the magnetic path in the radial circumferential direction must be greater than or equal to the cross-sectional area of ​​the magnetic poles. The opening position of the inclined hole thrust plate is opened within the magnetic circuit. In each radial circumferential direction, the cross-sectional area of ​​the magnetic circuit flow position = the radial circumferential cross-sectional area of ​​the thrust plate - the cross-sectional area in the same direction of the hole position ≥ the cross-sectional area of ​​the magnetic pole position. The air inlet at the upper end of the inclined hole is located between the axial upper and lower magnetic poles and is opposite to the coil. The aperture size is ≤ the radial spacing between the axial upper and lower magnetic poles of the stator; the air inlet at the lower end of the inclined hole is located at the aperture of the non-magnetic part of the inner ring of the axial lower magnetic pole. The aperture size is less than the radial spacing between the axial lower magnetic pole of the stator and the rotor. Both ends of the aperture are connected to the axial stator ventilation path. The airflow resistance at both ends of the thrust plate is small, the fluidity is good, and the axial output is not affected.

[0123] 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.

[0124] In some embodiments,

[0125] The motor further includes a cylinder 19, a rear end cover 120, a rear housing 130, and a rear radial bearing 140. An axial end of the rotor 6 is provided with a rotor inlet air passage 210 along the axial direction toward the interior of the rotor 6. An end of the rotor inlet air passage 210 opposite to the rear end cover 120 forms an air inlet. The magnetic bearing and the motor stator are both located inside the cylinder 19.

[0126] The rear end cover 120 is disposed at one axial end of the cylinder 19 , the rear housing 130 is located inside the cylinder 19 and connected to the rear end cover 120 , and the rear radial bearing 140 is located inside the cylinder 19 ;

[0127] A motor air outlet 26 is provided through the inner and outer circumferential walls of the cylinder 19 . The motor air outlet 26 is located between the motor stator 15 and the rear radial bearing 140 in the axial direction. The motor stator flow channel 230 and the motor rotor flow channel 240 are respectively connected to the motor air outlet 26 .

[0128] 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 of the air intake, the rear shell, and the rear radial bearing structure. It can pass through the rotor inlet flow channel inside the rotor. As it rotates, the gas is sucked into the rotor exhaust flow channel from the air inlet of the rotor inlet flow channel and discharged to the inside of the cylinder, and respectively supplied to the motor rotor flow channel, the motor stator flow channel and the air channel of the magnetic levitation bearing, thereby increasing the air flow path, increasing the heat dissipation area of ​​the magnetic levitation bearing, the motor stator and the rotor part, and improving the cooling and heat dissipation performance.

[0129] In some embodiments,

[0130] 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.

[0131] The inner and outer circumferential walls of the cylinder 19 are also penetrated by a bearing air outlet 25, which is opposite to and connected to the accommodating space; so that the air channel of the magnetic bearing, the front radial bearing flow channel, the front housing flow channel, the accommodating space and the bearing air outlet 25 are connected in sequence.

[0132] 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 front end cover, front housing, front radial bearing, etc., which can guide the gas after passing through the two cooling paths of the magnetic levitation bearing to the front radial bearing for heat exchange, and discharge it to the outside of the cylinder from the front housing flow channel, the accommodating space and the bearing outlet, thereby improving the cooling and heat dissipation performance; the airflow after dissipating the heat to the stator through the motor stator flow channel and the airflow after dissipating the heat to the rotor through the motor rotor flow channel are merged and discharged through the motor outlet.

[0133] Figure 6 The cooling channel path scheme of the magnetic levitation rotating machinery of the present invention is shown as preferably a blower, etc., adopting an active pure air-cooling heat dissipation system. The cold air is provided by the centrifugal rotation of the rotor, and no additional heat dissipation drive motor is required. The front radial bearing 17 is placed at the front end, and the axial bearing is located between the front radial bearing 17 and the motor stator 15. There is a rotor inlet airflow channel 210 inside the rear end of the rotor. From back to front, it passes through the rotor inlet airflow channel 210, and then passes through several rotor exhaust airflow channels 220 from the inside of the rotor to the outside, which are located between the motor stator 15 and the axial bearing. In addition, several corresponding ventilation holes or ventilation slots are opened on the cylinder 19, the front housing 18, the axial bearing and other parts to facilitate airflow conduction. The cooling gas generated by the centrifugal rotation of the rotor is divided into three cooling paths through the rotor exhaust airflow channel 220: one path at the left end passes through the bearing stator ventilation hole 03 at the axial magnetic bearing , the bearing stator ventilation slot 1 04, the thrust plate left-handed inclined hole (the first thrust plate ventilation hole 01) is discharged, and the two-way thrust plate left-handed inclined hole (the second thrust plate ventilation hole 02), the bearing stator ventilation slot 2 04', the bearing stator ventilation hole 2 03' are discharged. The two ways are merged and then flow to the front radial bearing 17 → bearing air outlet 25 for discharge; the two ways on the right end pass through the motor stator flow channel 230 and the motor rotor flow channel 240 and then pass through the rear radial bearing 140 for discharge. This flow channel structure arrangement is effective for cooling the heat-generating components such as the stator, rotor, radial bearings, and axial bearings separately. At the same time, the thrust plate with inclined holes for high-heat-generating components uses negative pressure to suck out the hot air through the inclined hole flow channel, thereby realizing effective ventilation and cooling of the overall 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.

[0134] The beneficial effects of the present invention are as follows:

[0135] 1. This invention provides inclined holes in the thrust plate for high-heat-generating components, combined with ventilation slots for the axial coils. Negative pressure is used to draw heat out through the inclined hole flow channel, actively cooling the thrust plate itself and increasing the cooling flow to accelerate heat dissipation from the axial coils. This active, pure air-cooling system reduces heat dissipation costs, and targeted ventilation of heat-generating components effectively accelerates cooling and improves reliability.

[0136] 2. The present invention also cooperates with the overall flow channel structure layout, and carries out targeted ventilation and heat dissipation on the heat-generating components, thereby realizing 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 is highly reliable.

[0137] 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.

[0138] Figure 1 、 Figure 3 The figure shows the internal axial bearing cooling path of the magnetic levitation machinery (preferably a blower) of the present invention. Bearing stator ventilation holes are provided on the axial stator one / two, and bearing stator ventilation slots are opened in the coil slots, preferably in radial, annular or spiral shapes, etc. The thrust plate 3 is provided with several staggered X-shaped inclined holes from the inside to the outside and from the outside to the inside in the axial and radial spaces (holes from the inside to the outside or holes from the outside to the inside can exist alone, or they can exist at the same time). One of the openings of the inclined hole is directly opposite the coil between the axial inner and outer magnetic poles, corresponding to the wire slot ventilation position. There is no requirement for the hole type. For the convenience of machining and process, circular holes, rectangular circular holes or elliptical holes are preferred. There are two cooling paths. The first cooling path takes air in from the ventilation holes on the axial stator, passes through the ventilation slots, the inner ring of the axial coil, and between the inner and outer axial magnetic poles, and then is discharged through the thrust plate's oblique holes. The second cooling path takes air in from the thrust plate's oblique holes, passes through the inner and outer axial magnetic poles of the axial stator, the inner ring of the axial coil, the axial stator ventilation slots, and then is discharged through the axial stator ventilation holes (if only one hole from inside to outside or only one hole from outside to inside exists, there is only one path). During operation, the direction of air intake through the thrust plate's oblique holes is opposite to the direction of rotor rotation. The thrust plate uses negative pressure to draw out the cooling gas, increasing the gas flow rate, accelerating heat exchange between the thrust plate and the axial coil, and combining with the cooling path of the overall solution to achieve effective 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 oblique 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 has a right-handed oblique 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, the thrust plate has a left-handed oblique hole. Similarly, if the directions do not match, the heat dissipation effect will be weakened and the heat dissipation efficiency will be reduced.

[0139] 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 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 (240), and both the motor stator flow channel (230) and the motor rotor flow channel (240) can circulate gas; the magnetic bearing is located on one axial side of the motor stator and can support the rotor (6); a rotor inlet flow channel (210) is provided inside the rotor (6), and a rotor exhaust flow channel (220) is further provided on the rotor (6), one end of the rotor inlet flow channel (210) can be communicated with external air intake, and the other end is communicated with the rotor exhaust flow channel (220), and the rotor exhaust flow channel (220) is located between the magnetic bearing and the motor stator (15); 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 first thrust disc ventilation hole (01) 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. A coil 1 (5) is provided in the coil slot 1 (13). The axial stator 2 (2) includes a radially outer portion 2 (21) and a radially 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 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 rotor exhaust flow channel (220) can be respectively communicated with the first thrust plate ventilation hole (01), the motor stator flow channel (230) and the motor rotor flow channel (240).

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 disk (3), and an axial end surface of the pressure plate (4) being connected to the radial outer portion (11) of the axial stator (1), and the other axial end surface of the pressure plate (4) being opposite to the thrust disk (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 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 first thrust disk ventilation hole (01) ≥ the cross-sectional area of ​​the magnetic pole position of the axial stator (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 portion 1 (12), forming a first gas flow path (06). The axial stator (1) further includes 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 disk (3). Inside the coil slot (13), a third gap is also provided 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 rotor exhaust flow channel (220) is connected to the bearing stator ventilation hole (03) through the first thrust plate ventilation hole (01).

5. The magnetic levitation rotating machine according to any one of claims 1 to 4, 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 thereof, the rotation direction of the thrust plate (3) is toward the 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 thereof 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 ventilation holes (01), and the plurality of first thrust plate ventilation holes (01) are arranged at intervals along the circumferential direction of the thrust plate (3), and the extension direction of each first thrust plate ventilation hole (01) from the axial end face on the air inlet side of the thrust plate toward the axial end face on the air outlet side 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 any one of claims 1 to 6, characterized in that: A second thrust disc ventilation hole (02) is provided on the thrust disc (3) 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 disc ventilation hole (02) located on the axial end face of the thrust disc (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 disc ventilation hole (02) located on the other axial end face of the thrust disc (3) is opposite to the position of the coil slot 2 (23) in the axial direction, and the second thrust disc ventilation hole (02) is not opposite to the magnetic pole position of the axial stator 2 (2); The rotor exhaust flow channel (220) can also communicate 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 the portion of the pressure plate 2 (4') opposite to the thrust disk (3), and the portion of the radial inner portion 2 (22) opposite to the thrust disk (3), a fourth gap (07) is provided between the pressure plate 2 (4') and the radial inner portion 2 (22), the second thrust disk ventilation hole (02) and the fourth gap (07) are opposite to each other in the axial direction, and the radial dimension of the fourth gap (07) is greater than or equal to the radial dimension of the second thrust disk ventilation hole (02) and the opposite end of 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 relative portion of the thrust disk and 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), which is arranged in the axial direction of the magnetic bearing relative to the coil 2 (5') and away from the thrust disk (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') extends from one axial end surface of the axial outer side 2 (24) to the other axial end surface to communicate with the bearing stator ventilation groove 2 (04'), and further communicates with the second thrust plate ventilation hole (02) through the second gas flow path (08); The rotor exhaust flow channel (220) 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 thereof, the rotation direction of the thrust plate (3) is toward the 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 thereof is toward the 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), and the plurality of second thrust plate ventilation holes (02) are arranged at intervals along the circumferential direction of the thrust plate (3), and the extension direction of each second thrust plate ventilation hole (02) from the axial end face on the air inlet side of the thrust plate toward the axial end face on the air outlet side 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 1, characterized in that: The motor further comprises a cylinder (19), a rear end cover (120), a rear housing (130) and a rear radial bearing (140); an axial end of the rotor (6) is provided with a rotor inlet air passage (210) along an axial direction toward the interior of the rotor (6); an end of the rotor inlet air passage (210) opposite to the rear end cover (120) is formed as an air inlet; and the magnetic suspension bearing and the motor stator are both located inside the cylinder (19); The rear end cover (120) is arranged at one axial end of the cylinder (19), the rear housing (130) is located inside the cylinder (19) and connected to the rear end cover (120), and the rear radial bearing (140) is located inside the cylinder (19); A motor air outlet (26) is provided through the inner and outer peripheral walls of the cylinder (19), and the motor air outlet (26) is located between the motor stator (15) and the rear radial bearing (140) in the axial direction, and the motor stator flow channel (230) and the motor rotor flow channel (240) are respectively communicated with the motor air outlet (26).

14. The magnetic levitation rotating machine according to claim 13, characterized in that: The invention 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 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 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); The inner and outer peripheral walls of the cylinder (19) are also provided with a bearing air outlet (25) extending therethrough, and the bearing air outlet (25) is opposite to and communicates with the accommodating space, so that the air passage of the magnetic suspension bearing, the front radial bearing flow passage, the front housing flow passage, the accommodating space and the bearing air outlet (25) are sequentially communicated.

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