Magnetic suspension rotating machine

Abstract

The invention provides a magnetic suspension rotating machine which comprises a barrel, a magnetic suspension bearing, a motor stator and a motor rotor, a barrel runner is formed in the barrel in the axial direction, and a motor rotor runner is formed in the rotor; in the axial direction, the thrust disc is arranged between the first axial stator and the second axial stator, a first thrust disc ventilation hole is formed in the thrust disc in a penetrating mode from one axial end face to the other axial end face of the thrust disc, and the first axial stator comprises a first radial outer side part and a first radial inner side part. One end, positioned on the other axial end surface of the thrust disc, of each first thrust disc vent hole is positioned between the radial inner side part II of the axial stator II and the rotor, and the other end, positioned on the axial end surface of the thrust disc, of each first thrust disc vent hole is opposite to the position of the coil slot I in the axial direction; and the first thrust disc vent hole is not opposite to the magnetic pole position of the first axial stator. According to the magnetic suspension bearing, heat dissipation and cooling of the magnetic suspension bearing are improved, meanwhile, the influence on a magnetic suspension magnetic circuit can be avoided, and enough magnetic suspension supporting force is guaranteed.

Description

Technical Field

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

[0002] At present, the heat dissipation of magnetic levitation blowers is mainly external cooling equipment, usually external cooling fans, water cooling systems and heat exchangers, etc., which have high equipment maintenance costs, complex structural systems, and increased safety hazards. Or in the form of negative pressure, air is sucked from the blower to guide the heat out, which cannot more effectively achieve the heat dissipation of internal components, especially the heat dissipation of axial magnetic bearings is not sufficient, affecting the stable operation of the magnetic levitation air compressor.

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

[0004] Since the magnetic suspension bearing inside the rotating machine in the prior art has technical problems such as poor cooling and heat dissipation effect, the present invention studies and designs a magnetic suspension rotating machine. 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 cylinder, a magnetic bearing, a motor stator and a rotor, wherein the motor stator is located at the radial outer periphery of a part of the shaft section of the rotor, the magnetic bearing, the rotor and the motor stator are all located inside the cylinder, a cylinder flow channel is opened on the cylinder along the axial direction, a rotor air gap exists at the part of the rotor opposite to the motor stator to form a motor rotor flow channel, and both the cylinder flow channel and the motor rotor flow channel can flow gas;

[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 axial end face 1 to its axial end face 2. 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 arranged at intervals in the radial direction of the axial stator 1, and a coil slot 1 is formed between the two, and a coil 1 is arranged in the coil slot 1.

[0009] The axial stator 2 includes a radial outer portion 2 and a radial inner portion 2,

[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 cylinder flow channel can be connected with the first thrust plate ventilation hole and the motor rotor flow channel in sequence.

[0012] In some embodiments,

[0013] It also includes a pressure plate 1, the pressure plate 1 is located between the axial stator 1 and the thrust plate, and an axial end surface of the pressure plate 1 is connected to the radial outer side portion 1 of the axial stator 1, and the other axial end surface of the pressure plate 1 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 thrust plate and the corresponding part of 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 also 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, there is also a third gap 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 side 1 of the axial stator 1, and the bearing stator ventilation hole 1 penetrates from one axial end surface of the axial outer side 1 to the other axial end surface 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 motor rotor flow channel can be 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, and the rotation direction of the thrust plate is toward a first rotation direction 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 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 a 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 in the first thrust plate are arranged at intervals along the circumferential direction of the thrust plate. An extension direction of each ventilation hole in the first thrust plate from an axial end face on the air inlet side of the thrust plate toward an axial end face on the air outlet side is toward a second rotation direction, which is opposite to the first rotation direction of the thrust plate.

[0026] In some embodiments,

[0027] The thrust plate is provided with a second thrust plate ventilation hole extending 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 face 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 face 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 motor rotor flow channel can also be in communication with the second thrust plate ventilation hole.

[0030] In some embodiments,

[0031] It also includes a second pressure plate, 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 connected to the second radial outer side 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 portion of the pressure plate 2 opposite to the thrust plate, and the portion of the radial inner portion 2 opposite to the thrust plate, a fourth gap is provided between the pressure plate 2 and the radial inner portion 2, the second thrust plate ventilation hole is opposite to the fourth gap in the axial direction, and a radial dimension of the fourth gap is greater than or equal to a radial dimension of an 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 thrust plate and the corresponding part of 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 to form a second gas flow path.

[0037] The second axial stator further comprises 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, and inside the second coil slot, there is also a sixth gap between the second axial outer portion and the second coil, forming a second bearing stator ventilation slot;

[0038] A bearing stator ventilation hole 2 is provided on the axial outer portion 2 of the axial stator 2, and the bearing stator ventilation hole 2 penetrates from one axial end surface of the axial outer portion 2 to the other axial end surface to communicate with the bearing stator ventilation groove 2, and further communicates with the second thrust plate ventilation hole through the second gas flow path;

[0039] The motor rotor flow channel is connected with 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, and the rotation direction of the thrust plate is toward the third rotation direction 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 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 of the second thrust plate, and the multiple ventilation holes of the second thrust plate are arranged at intervals along the circumferential direction of the thrust plate. An extension direction of each ventilation hole of the second thrust plate 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.

[0044] In some embodiments,

[0045] It also includes 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, and an axially penetrating air inlet is arranged at the central axis position of the rear end cover, and the air inlet is directly opposite to the cooling impeller;

[0046] The rear housing is provided with a rear housing flow channel in the axial direction, one end of the rear housing flow channel can be communicated with the cylinder flow channel, and the other end of the rear housing flow channel can be communicated with the impeller air outlet of the cooling impeller;

[0047] The airflow can enter the barrel flow channel through the air inlet, the cooling impeller, the interior of the rear end cover and the rear casing flow channel in sequence.

[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 motor stator, 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 a storage space is formed between the front end cover and the front housing, a front housing channel is provided on the front housing axially penetrating therethrough, one end of the front housing channel is opposite to and connected with the storage space, and the other end is opposite to and connected with the cylinder flow channel;

[0050] A motor air outlet is also provided on the cylinder, and the motor air outlet is located between the rear radial bearing and the motor stator, so that the air flow can pass through the cylinder flow channel, the front shell channel, the accommodating space, the front shell flow channel, the front radial bearing flow channel and the air channel of the magnetic bearing in sequence, and then pass through the motor rotor flow channel and then be discharged through the motor air outlet.

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

[0052] 1. The present invention realizes active air suction and heat exchange through high rotation speed by opening the first and / or second thrust plate ventilation holes on the thrust plate, increases the gas flow rate, accelerates the cooling of the axial magnetic bearing, actively cools the thrust plate itself and increases the cooling flow rate to accelerate the heat dissipation of the axial coil, improves the cooling and heat dissipation effect of the magnetic suspension bearing, and makes the end of the first thrust plate ventilation hole opposite to the coil slot one not opposite to the magnetic pole position of the axial stator one (one 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 influence of the cooling gas and the opening on 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 influence on the magnetic suspension magnetic circuit, ensuring sufficient magnetic suspension supporting force, and effectively reducing the influence 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 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 airflow resistance at both ends of the thrust plate is small and the fluidity is good;

[0053] The present invention also arranges a cylinder flow channel on the cylinder and a motor rotor flow channel on the rotor, so that the cooling gas at the air inlet enters the cylinder flow channel from the cooling impeller, passes through the front radial bearing, the magnetic suspension axial bearing (thrust plate inclined hole + axial bearing stator ventilation hole), the motor rotor, and finally discharges from the motor outlet at the rear radial bearing, thereby increasing the air flow path of the magnetic suspension bearing and the motor stator and motor rotor, and further improving the cooling and heat dissipation efficiency and cooling and heat dissipation performance of the magnetic suspension 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 path 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 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 path parts on the thrust disk that are different from the magnetic pole position will not appear magnetic field saturation before the magnetic pole position, thereby ensuring the formation of a normal magnetic flux circuit and ensuring 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 toward The second rotation direction is opposite to the first rotation direction (the rotation direction of the thrust plate). When the rotor drives the thrust plate to rotate at a high speed, negative pressure is generated to suck out the hot air at one end and discharge it to the outside, thereby increasing the gas flow rate, realizing active ventilation and heat exchange of the thrust plate itself, accelerating the gas flow, saving energy consumption, improving the heat dissipation performance and improving the energy efficiency; at the same time, in conjunction with the bearing stator ventilation holes and ventilation grooves (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 embodiment 1 of the magnetic bearing of the present invention;

[0056] Figure 2 yes Figure 1 The plan view of the thrust plate structure in FIG. 1 (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 in FIG. 1 (thrust plate ventilation hole with right-handed inclined hole);

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

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

[0061] The reference numerals are as follows:

[0062] 1. Axial stator 1; 11. Radial outer part 1; 12. Radial inner part 1; 13. Coil slot 1; 14. Axial outer part 1; 2. Axial stator 2; 21. Radial outer part 2; 22. Radial inner part 2; 23. Coil slot 2; 24. Axial outer part 2; 3. Thrust plate; 4. Pressure plate 1; 4', Pressure plate 2; 5. Coil 1; 5', Coil 2; 6. Rotor; 10. Cooling impeller; 110. Guide plate; 120. Rear end cover; 121. Air inlet; 130. Rear housing; 140. Rear radial bearing; 15. Motor stator; 17. Front radial bearing; 18. Front housing; 19. Cylinder; 20. Front end cover; 210. Impeller air outlet; 220. Rear housing flow channel; 230. Cylinder flow channel; 240. Motor rotor flow channel; 25. Front housing channel; 26. Motor air outlet;

[0063] 01. First thrust plate ventilation hole; 02. Second thrust plate ventilation hole; 03. Bearing stator ventilation hole one; 03', bearing stator ventilation hole two; 04. Bearing stator ventilation slot one; 04', bearing stator ventilation slot two; 05. First gap; 06. First gas flow path; 07. Fourth gap; 08. Second gas flow path. DETAILED DESCRIPTION

[0064] The following will be combined with the 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 described embodiments 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 by no means 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 creative work 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, it indicates 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 described in these embodiments, numerical expressions and numerical values ​​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 accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0067] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the 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 devices or elements 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 contours 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 here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. 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 figure. For example, if the device in the accompanying 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. If not 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 cylinder 19, a magnetic bearing, a motor stator 15 and a rotor 6, wherein the motor stator is located at the radial outer periphery of a part of the shaft section of the rotor 6, the magnetic bearing, the rotor 6 and the motor stator are all located inside the cylinder 19, a cylinder flow channel 230 is axially opened on the cylinder 19, a rotor air gap exists at the part of the rotor 6 opposite to 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 cylinder flow channel 230 and the motor rotor flow channel 240 can flow gas; the magnetic bearing is located on one side of the axial direction of the motor stator and can support the rotor 6;

[0072] The magnetic bearing comprises 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 comprises 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 arranged in the coil slot 13. The axial stator 2 comprises 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 side 22 of the axial stator 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 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 cylinder flow channel 230 can be connected with the first thrust plate ventilation hole 01 and the motor rotor flow channel 240 in sequence.

[0075] The present invention realizes its own active air suction heat exchange through high rotation speed through the first thrust plate ventilation hole 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. In addition, 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, so that the thrust plate 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 support 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 support force, and effectively reducing the influence of the gas force on the axial force;

[0076] The present invention also arranges a cylinder flow channel on the cylinder and a motor rotor flow channel on the rotor, so that the cooling gas at the air inlet enters the cylinder flow channel from the cooling impeller, passes through the front radial bearing, the magnetic suspension axial bearing (thrust plate inclined hole + axial bearing stator ventilation hole), the motor rotor, and finally discharges from the motor outlet at the rear radial bearing, thereby increasing the air flow path of the magnetic suspension bearing and the motor stator and motor rotor, and further improving the cooling and heat dissipation efficiency and cooling and heat dissipation performance of the magnetic suspension machinery.

[0077] In some embodiments,

[0078] It also includes a pressure plate 4, the pressure plate 4 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 side 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, a first gap 05 is provided 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 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.

[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 of 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 to 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 plate 3, the cross-sectional area of ​​the magnetic path flow position of the axial stator 1 = the radial cross-sectional area of ​​the thrust plate and the corresponding part of the axial stator 1 - the cross-sectional area of ​​the first thrust plate 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 in any radial cross-section of the thrust plate: the cross-sectional area of ​​the magnetic circuit flow position of the axial stator 1 = the radial cross-sectional area of ​​the thrust plate and the relative parts of 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, so that other magnetic circuit parts on the thrust plate 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 ensuring the continuous and effective provision of magnetic suspension supporting force.

[0084] In some embodiments,

[0085] Inside the coil slot 13, there is a second gap 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 also 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 plate 3. Inside the coil slot 13, there is also a third gap between the axial outer portion 14 and the coil 5, forming a bearing stator ventilation slot 04;

[0087] 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 penetrates 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;

[0088] The motor rotor flow channel 240 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 grooves (multiple gas flow paths) in the axial stator coil grooves, so that the motor rotor channel is connected to the bearing stator ventilation hole 1 through the first thrust plate ventilation hole, which can further accelerate the gas flow in the axial stator coil groove cavity and achieve effective autonomous heat dissipation of the axial coil and the thrust plate.

[0090] In some embodiments,

[0091] 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, and 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 first rotation direction, and 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 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 a high speed, negative pressure is generated to suck out hot air at one end and discharge it to the outside, thereby increasing the gas flow rate, 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 realize its own active air suction heat exchange through high speed, increase the gas flow rate introduced, accelerate the cooling of the axial magnetic bearing, and cooperate with the overall active pure air cooling of the blower to dissipate heat. 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 is used to change the previous external passive heat dissipation into internal active heat dissipation, improve the heat dissipation efficiency and reduce the heat dissipation cost. This blower cooling scheme can effectively ventilate and dissipate heat for motor stators, motor rotors, magnetic bearings, etc., and can also better dissipate heat for axial magnetic bearings, thereby 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, and the second thrust plate ventilation hole 02 is misaligned with 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 5' is arranged in the coil slot 23, one end of the second thrust plate ventilation hole 02 located on the one axial end face of the thrust plate 3 is located between the radial inner portion 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 face 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 motor rotor flow channel 240 can also be in communication 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 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 cooling of the magnetic suspension bearing, and avoid the influence on 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 flow channels (X-type heat exchange flow channels) for dissipating heat from the magnetic suspension bearing, further improving the cooling and heat dissipation efficiency of the magnetic suspension bearing.

[0102] In some embodiments,

[0103] 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;

[0104] The magnetic pole position of the axial stator 2 includes the portion of the pressure plate 2 4' opposite to the thrust plate 3, and the portion of the radial inner portion 22 opposite to the thrust plate 3, a fourth gap 07 is provided between the pressure plate 2 4' and the radial inner portion 22, the second thrust plate ventilation hole 02 is opposite to the fourth gap 07 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 ventilation hole 02 and one end of the coil slot 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 of 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 to 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 thrust plate and the corresponding part of 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 to the coil, and further makes 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 avoid affecting the magnetic circuit, and the second 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.

[0109] In some embodiments,

[0110] Inside the coil slot 23, there is a fifth gap between the radial inner side of the coil 2 5' and the 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, which 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, there is also a sixth gap between the second axial outer portion 24 and the second coil 5', forming a bearing stator ventilation slot 204';

[0112] The axial outer portion 24 of the axial stator 2 is provided with a bearing stator ventilation hole 2 03 ', and the bearing stator ventilation hole 2 03 ' penetrates from one axial end surface of the axial outer portion 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;

[0113] The motor rotor flow channel 240 is connected to the second thrust plate ventilation hole 02 through the bearing stator ventilation hole 2 03 ′.

[0114] The present invention further achieves effective cooling and heat dissipation inside the bearing by arranging bearing stator ventilation holes and ventilation grooves (multiple gas flow paths) in the coil grooves of the axial stator 2, so that the motor rotor channel is connected to the second thrust plate ventilation hole through the bearing stator ventilation hole 2, and two gas flow channels (X-shaped heat exchange channels) are formed for heat dissipation of the magnetic suspension bearing, which can further accelerate the gas flow in the coil groove 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, and 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, and 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 a high speed, negative pressure is generated to suck out hot air at one end and discharge it to the outside, thereby increasing the gas flow rate, 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 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 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 realize its own active air suction heat exchange through high speed, increase the gas flow rate introduced, accelerate the cooling of the axial magnetic bearing, and cooperate with the overall active pure air cooling of the blower. 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 is used to change the previous external passive heat dissipation into internal active heat dissipation, improve the heat dissipation efficiency and reduce the heat dissipation cost. This blower cooling scheme can effectively ventilate and dissipate heat for motor stators, motor rotors, magnetic bearings, etc., and can also better dissipate heat for axial magnetic bearings, thereby 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 inclined hole between the two magnetic poles of the thrust plate. The thrust plate 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 (in order to cooperate with the whole machine solution to cool the thrust plate, only one air intake inclined 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 a 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 grooves in the axial stator coil slots 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 bearing, the relative position of the thrust plate and the axial magnetic pole is the output position, that is, the thrust plate end face facing the magnetic pole position cannot be punched to avoid insufficient axial force. At the same time, the cooling air cannot directly reach the magnetic pole gap position, which can reduce the effect of gas force on the axial force. According to the requirements of axial magnetic circuit flow, in order to ensure that the magnetic field saturation does not occur at other positions before the magnetic pole position, in the radial circumferential direction, the cross-sectional area of ​​the magnetic circuit flow position ≥ the cross-sectional area of ​​the magnetic pole position. The opening position of the thrust plate with inclined hole 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 directly opposite to the coil, and the aperture size is ≤ the radial spacing between the upper and lower magnetic poles of the axial stator; the air inlet at the lower end of the inclined hole is located at the aperture of the non-magnetic conductive part of the inner ring of the axial lower magnetic pole, and the aperture size is < the radial spacing between the lower magnetic pole of the axial stator and the rotor. Both ends of the aperture are connected with 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 inlet or the main impeller leaks inlet. No additional cooling drive motor is required. The cooling cold air flow 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] It also includes a rear end cover 120, a cooling impeller 10, a rear housing 130 and a rear radial bearing 140, wherein the cooling impeller 10 is arranged at one axial end of the rotor 6 so as to be able to rotate integrally with the rotor 6, the cooling impeller 10 is arranged inside the rear end cover 120, and an axially penetrating air inlet 121 is arranged at the central axis position of the rear end cover 120, and the air inlet 121 is directly opposite to the cooling impeller 10;

[0126] The rear housing 130 is provided with a rear housing flow channel 220 along the axial direction, one end of the rear housing flow channel 220 can be communicated with the barrel flow channel 230, and the other end of the rear housing flow channel 220 can be communicated with the impeller air outlet 210 of the cooling impeller 10;

[0127] The airflow can enter the barrel flow channel 230 through the air inlet 121, the cooling impeller 10, the interior of the rear end cover 120 and the rear housing flow channel 220 in sequence. 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 structure of the air intake rear end cover, the rear housing, the rear radial bearing and the cooling impeller. The cooling impeller can suck gas from the air inlet into the interior of the rear end cover as the rotor rotates as a whole, and supply it to the barrel flow channel and the motor rotor flow channel respectively through the rear housing flow channel, thereby improving the airflow path, increasing the heat dissipation area of ​​the barrel and rotor parts, and improving the cooling and heat dissipation performance.

[0128] In some embodiments,

[0129] It also includes a front radial bearing 17, a front housing 18 and a front end cover 20, wherein the front radial bearing 17 and the front housing 18 are both located on the axial side of the magnetic bearing away from the 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 the axial side of the cylinder 19 away from the rear end cover 120, and a storage space is formed between the front end cover 20 and the front housing 18, a front housing channel 25 is axially penetrated on the front housing 18, one end of the front housing channel 25 is opposite to and communicated with the storage space, and the other end is opposite to and communicated with the cylinder flow channel 230;

[0130] A motor air outlet 26 is also provided on the cylinder 19, and the motor air outlet 26 is located between the rear radial bearing 140 and the motor stator 15, so that the air flow can pass through the cylinder flow channel 230, the front shell channel 25, the accommodating space, the front shell flow channel, the front radial bearing flow channel and the air channel of the magnetic bearing in sequence, and then pass through the motor rotor flow channel 240 and then be discharged through the motor air outlet 26.

[0131] 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 of the air intake, the front housing, the front radial bearing, etc. The gas after passing through the cylinder flow channel to cool the stator and the magnetic levitation bearing can be introduced into the interior of the magnetic levitation bearing through the front housing and the front radial bearing to exchange heat with the magnetic levitation bearing, and after the heat exchange, the gas flows through the motor rotor flow channel to exchange heat with the rotor, and finally is discharged to the outside of the cylinder through the motor outlet, thereby improving the cooling and heat dissipation performance.

[0132] Figure 6 The cooling flow 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 cooling impeller, and no additional heat dissipation drive motor is required. The cooling impeller 10 is installed at the rear end of the rotor, the rear radial bearing 140 is located between the cooling impeller 10 and the motor stator 15, the front end is placed on the front radial bearing 17, and the axial bearing is located between the front radial bearing 17 and the motor stator 15. The rear housing is equipped with a guide plate 110 and a rear end cover 120 for cooling the impeller to guide the flow to increase air flow conduction and reduce flow resistance, and the rear housing 130, the cylinder 19, the front housing 18, the axial bearing and other parts are provided with a number of corresponding ventilation holes or ventilation grooves for air flow conduction, and the cooling gas at the impeller outlet 210 passes through the rear housing flow channel 220 on the rear housing 130 → the cylinder flow channel 230 on the cylinder 19 → the front on the front housing 18 Shell channel 25 → front radial bearing 17 → axial magnetic bearing, through one way of discharge through bearing stator ventilation hole 03, bearing stator ventilation groove 04, thrust plate right-handed oblique hole (first thrust plate ventilation hole 01) and two ways of discharge through thrust plate right-handed oblique hole (second thrust plate ventilation hole 02), bearing stator ventilation groove 2 04', bearing stator ventilation hole 2 03', the two ways converge and then flow to motor rotor flow channel 240 → rear radial bearing 140 → motor air outlet 26 to discharge cylinder 19. This flow channel structure arrangement can effectively cool the heat-generating components such as stator, rotor, radial bearing, axial bearing, etc. At the same time, the thrust plate with oblique holes for high heat generation components uses negative pressure to suck out hot air through the oblique hole flow channel, so as to achieve 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 suspension system is improved.

[0133] The beneficial effects of the present invention are as follows:

[0134] 1. The present invention sets an oblique hole on the thrust plate for high-heat generating components and cooperates with the axial coil ventilation groove, and uses negative pressure to absorb heat through the oblique hole flow channel, which can actively cool the thrust plate itself and increase the cooling flow to accelerate the heat dissipation of the axial coil. The active pure air cooling heat dissipation system reduces the heat dissipation cost, and targeted ventilation of heat generating components can effectively accelerate cooling and improve reliability;

[0135] 2. The present invention also cooperates with the flow channel structure layout of the whole machine, and carries out targeted ventilation and heat dissipation on the heat-generating components, so as to realize effective ventilation and cooling of the overall heat-generating components of the blower and improve the stability of the magnetic levitation system; it realizes an integrated high-efficiency pure air-cooled heat dissipation system, which can ensure that the blower has sufficient heat dissipation air volume under various working conditions. The cold air is directly driven by the motor rotor, the control logic is simple, and the heat dissipation system has high reliability.

[0136] The present invention also provides a magnetic suspension rotating machine (preferably a rotating machine such as a motor, a blower, a ventilator or a compressor), which includes the aforementioned magnetic suspension bearing.

[0137] 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. The axial stator one / two is provided with bearing stator ventilation holes, and the coil slot is provided with a bearing stator ventilation slot, which is preferably radial, annular or spiral. 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 space (the holes from the inside to the outside or the 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 to the coil between the axial inner and outer magnetic poles, corresponding to the wire slot ventilation. 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 is from the ventilation holes on the axial stator, through the ventilation slots, the inner ring of the axial coil, and between the axial inner and outer magnetic poles, and then discharged through the oblique holes of the thrust plate; the second cooling path is from the oblique holes of the thrust plate, through the axial inner and outer magnetic poles of the axial stator, the inner ring of the axial coil, the ventilation slots of the axial stator, and then discharged through the ventilation holes of the axial stator (if there is only one hole from the inside to the outside or from the outside to the inside, there is only one path). During operation, the air intake direction of the oblique holes of the thrust plate is opposite to the rotation direction of the rotor. The thrust plate uses negative pressure to suck out the heat dissipation gas, increase the gas flow, accelerate the heat exchange between the thrust plate and the axial coil, and cooperate with the cooling path of the overall solution to achieve effective heat dissipation. In order to make the thrust plate intake negative pressure air, the 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 intake direction and the rotor rotation direction. If the rotation direction of the 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 oblique hole. If the rotation direction of the intake rotor at the left end of the thrust plate is counterclockwise when viewed from the right end, the thrust plate is 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.

[0138] The above description is only 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 principle of the present invention shall be included in the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention. These improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A magnetically suspended rotating machine, characterized in that: include: A cylinder (19), a magnetic bearing, a motor stator (15) and a rotor (6), wherein the motor stator is located on the radial outer periphery of a part of the shaft section of the rotor (6), the magnetic bearing, the rotor (6) and the motor stator are all located inside the cylinder (19), a cylinder flow channel (230) is opened in the axial direction on the cylinder (19), a rotor air gap exists in the part of the rotor (6) opposite to the motor stator to form a motor rotor flow channel (240), and gas can flow through the cylinder flow channel (230) and the motor rotor flow channel (240); the magnetic bearing is located on one side of the axial direction of the motor stator and can support the rotor (6); the magnetic bearing includes The invention comprises an axial stator 1 (1), an axial stator 2 (2) and a thrust plate (3); in the axial direction of the magnetic bearing, the thrust plate (3) is arranged between the axial stator 1 (1) and the axial stator 2 (2); a first thrust plate ventilation hole (01) is arranged on the thrust plate (3) from one axial end face to the other axial end face; the axial stator 1 (1) comprises a radial outer portion 1 (11) and a radial inner portion 1 (12); the radial outer portion 1 (11) and the radial inner portion 1 (12) are arranged at intervals in the radial direction of the axial stator 1 (1), and a coil slot 1 (13) is formed between the two, and a coil 1 (5) is arranged in the coil slot 1 (13); The axial stator 2 (2) comprises a radial outer portion 2 (21) and a radial inner portion 2 (22), One end of the first thrust plate ventilation hole (01) located on the other axial end surface of the thrust plate (3) is located between the radial inner side portion 2 (22) of the axial stator 2 (2) and the rotor (6), and one end of the first thrust plate ventilation hole (01) located on the one axial end surface of the thrust plate (3) is opposite to the position of the coil slot 1 (13) in the axial direction, and the first thrust plate ventilation hole (01) is not opposite to the magnetic pole position of the axial stator 1 (1); The cylinder flow channel (230) can be connected to the first thrust plate ventilation hole (01) and the motor rotor flow channel (240) in sequence.

2. The magnetic levitation rotating machine according to claim 1, characterized in that: It also includes a pressure plate (4), the pressure plate (4) being located between the axial stator (1) and the thrust plate (3), and an axial end surface of the pressure plate (4) being connected to the radial outer side portion (11) of the axial stator (1), and the other axial end surface of the pressure plate (4) being opposite to the thrust plate (3); The magnetic pole position of the axial stator (1) includes a portion of the pressure plate (4) opposite to the thrust disk (3) and a portion of the radial inner portion (12) opposite to the thrust disk (3); a first gap (05) is provided between the pressure plate (4) and the radial inner portion (12); the first thrust disk ventilation hole (01) and the first gap (05) are opposite to each other in the axial direction, and a radial dimension of the first gap (05) is greater than or equal to a radial dimension of an end of the first thrust disk ventilation hole (01) opposite to the coil slot (13).

3. The magnetic levitation rotating machine according to claim 2, characterized in that: In any radial cross section of the thrust disk (3), the cross-sectional area of ​​the magnetic path flow position of the axial stator one (1) = the radial cross-sectional area of ​​the thrust disk and the corresponding part of the axial stator one (1) - the cross-sectional area of ​​the first thrust disk ventilation hole (01) ≥ the cross-sectional area of ​​the magnetic pole position of the axial stator one (1).

4. The magnetic levitation rotating machine according to claim 1, characterized in that: Inside the coil slot 1 (13), a second gap is provided between the radial inner side of the coil 1 (5) and the radial inner side portion 1 (12), forming a first gas flow path (06). The axial stator (1) further comprises an axial outer portion (14), which is arranged in the axial direction of the magnetic bearing relative to the coil (5) and away from the thrust plate (3), and inside the coil slot (13), there is also a third gap between the axial outer portion (14) and the coil (5), forming a bearing stator ventilation slot (04); A bearing stator ventilation hole (03) is provided on the axial outer side (14) of the axial stator (1), and the bearing stator ventilation hole (03) extends from one axial end surface of the axial outer side (14) to the other axial end surface to communicate with the bearing stator ventilation groove (04), and further communicates with the first thrust plate ventilation hole (01) through the first gas flow path (06); The motor rotor flow channel (240) can be connected to the bearing stator ventilation hole 1 (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, the rotation direction of the thrust plate (3) is toward a first rotation direction; the extension direction of the first thrust plate ventilation hole (01) from the axial end face of the air inlet side of the thrust plate (3) toward the axial end face of the air outlet side is toward a second rotation direction, and the second rotation direction is opposite to the first rotation direction.

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

7. The magnetic levitation rotating machine according to any one of claims 1 to 6, characterized in that: The thrust disc (3) is provided with a second thrust disc ventilation hole (02) extending from the other axial end surface to the one axial end surface thereof, and the second thrust disc ventilation hole (02) is offset from the first thrust disc ventilation hole (01) and is not connected; The radial outer portion 2 (21) and the radial inner portion 2 (22) are spaced apart in the radial direction of the axial stator 2 (2), and a coil slot 2 (23) is formed therebetween, a coil 2 (5') is arranged in the coil slot 2 (23), one end of the second thrust plate ventilation hole (02) located on the one axial end face of the thrust plate (3) is located between the radial inner portion 1 (12) of the axial stator 1 (1) and the rotor (6), one end of the second thrust plate ventilation hole (02) located on the other axial end face of the thrust plate (3) is opposite to the position of the coil slot 2 (23) in the axial direction, and the second thrust plate ventilation hole (02) is not opposite to the magnetic pole position of the axial stator 2 (2); The motor rotor flow channel (240) can also be in communication with the second thrust plate ventilation hole (02).

8. The magnetic levitation rotating machine according to claim 7, characterized in that: It also includes a second pressure plate (4'), the second pressure plate (4') is located between the second axial stator (2) and the thrust plate (3), and one axial end surface of the second pressure plate (4') is connected to the second radial outer portion (21) of the second axial stator (2), and the other axial end surface of the second pressure plate (4') is opposite to the thrust plate (3); The magnetic pole position of the axial stator 2 (2) includes a portion of the pressure plate 2 (4') opposite to the thrust plate (3), and a portion of the radial inner portion 2 (22) opposite to the thrust plate (3); a fourth gap (07) is provided between the pressure plate 2 (4') and the radial inner portion 2 (22); the second thrust plate ventilation hole (02) and the fourth gap (07) are opposite to each other in the axial direction, and a radial dimension of the fourth gap (07) is greater than or equal to a radial dimension of an end of the second thrust plate ventilation hole (02) opposite to the coil slot 2 (23).

9. The magnetic levitation rotating machine according to claim 8, characterized in that: In each radial cross section of the thrust disk (3), the cross-sectional area of ​​the magnetic path flow position of the axial stator 2 (2) = the radial cross-sectional area of ​​the thrust disk and the corresponding part of the axial stator 2 (2) - the cross-sectional area of ​​the second thrust disk ventilation hole (02) ≥ the cross-sectional area of ​​the magnetic pole position of the axial stator 2 (2).

10. The magnetic levitation rotating machine according to claim 7, characterized in that: Inside the coil slot 2 (23), a fifth gap is provided between the radial inner side of the coil 2 (5') and the radial inner portion 2 (22), forming a second gas flow path (08). The axial stator 2 (2) further comprises an axial outer portion 2 (24), the axial outer portion 2 (24) being arranged in the axial direction of the magnetic bearing relative to the coil 2 (5') and away from the thrust plate (3), and inside the coil slot 2 (23), there is also a sixth gap between the axial outer portion 2 (24) and the coil 2 (5'), forming a bearing stator ventilation slot 2 (04'); A bearing stator ventilation hole 2 (03') is provided on the axial outer side 2 (24) of the axial stator 2 (2), and the bearing stator ventilation hole 2 (03') penetrates from one axial end surface of the axial outer side 2 (24) to the other axial end surface to communicate with the bearing stator ventilation groove 2 (04'), and further communicates with the second thrust plate ventilation hole (02) through the second gas flow path (08); The motor rotor flow channel (240) is connected to the second thrust plate ventilation hole (02) through the second bearing stator ventilation hole (03').

11. The magnetic levitation rotating machine according to claim 7, characterized in that: Along the axial direction of the thrust plate (3), the second thrust plate ventilation hole (02) is an inclined hole structure whose extension direction is not parallel to the axis of the thrust plate (3); when observing from the axial end face of the air inlet side of the thrust plate (3) toward the axial end face of the air outlet side, the rotation direction of the thrust plate (3) is toward a third rotation direction; the extension direction of the second thrust plate ventilation hole (02) from the axial end face of the air inlet side of the thrust plate (3) toward the axial end face of the air outlet side is toward a fourth rotation direction, and the fourth rotation direction is opposite to the third rotation direction.

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

13. The magnetic levitation rotating machine according to claim 1, characterized in that: It also includes a rear end cover (120), a cooling impeller (10), a rear casing (130) and a rear radial bearing (140), wherein the cooling impeller (10) is arranged at one axial end of the rotor (6) so as to rotate integrally with the rotor (6), the cooling impeller (10) is arranged inside the rear end cover (120), and an axially penetrating air inlet (121) is arranged at a central axis position of the rear end cover (120), and the air inlet (121) is directly opposite to the cooling impeller (10); A rear casing flow channel (220) is axially arranged on the rear casing (130), one end of the rear casing flow channel (220) can be in communication with the barrel flow channel (230), and the other end of the rear casing flow channel (220) can be in communication with the impeller air outlet (210) of the cooling impeller (10); The airflow is able to enter the barrel flow channel (230) through the air inlet (121), the cooling impeller (10), the interior of the rear end cover (120) and the rear casing flow channel (220) in sequence.

14. The magnetic levitation rotating machine according to claim 13, characterized in that: It also includes a front radial bearing (17), a front housing (18) and a front end cover (20), wherein the front radial bearing (17) and the front housing (18) are both located on the axial side of the magnetic bearing away from the stator of the motor, a front radial bearing flow channel is provided between the front radial bearing (17) and the outer periphery of the rotor (6), a front housing flow channel is provided between the front housing (18) and the outer periphery of the rotor (6), the front end cover (20) is provided on the axial side of the barrel (19) away from the rear end cover (120), and a storage space is formed between the front end cover (20) and the front housing (18), a front housing channel (25) is provided on the front housing (18) in an axially extending manner, one end of the front housing channel (25) is opposite to and connected with the storage space, and the other end is opposite to and connected with the barrel flow channel (230); The cylinder (19) is also provided with a motor air outlet (26), and the motor air outlet (26) is located between the rear radial bearing (140) and the motor stator (15), so that the air flow can sequentially pass through the cylinder flow channel (230), the front housing channel (25), the accommodating space, the front housing flow channel, the front radial bearing flow channel and the air channel of the magnetic bearing, and then pass through the motor rotor flow channel (240) and then be discharged through the motor air outlet (26).

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