Magnetic suspension bearing and magnetic suspension rotating machine

Abstract

The invention provides a magnetic suspension bearing and a magnetic suspension rotating machine.The magnetic suspension bearing comprises a first axial stator, a second axial stator and a thrust disc, the thrust disc is arranged between the first axial stator and the second axial stator in the axial direction of the magnetic suspension bearing, and the first axial stator comprises a first radial outer side part and a first radial inner side part; the first radial outer side portion and the first radial inner side portion are arranged at intervals in the radial direction of the first axial stator, a first coil groove is formed between the first radial outer side portion and the first radial inner side portion, and a first coil is arranged in the first coil groove. And the thrust disc ventilation holes are not opposite to the magnetic pole position of the first axial stator, and / or the thrust disc ventilation holes are not opposite to the magnetic pole position of the second 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 bearing and a magnetic suspension rotating machine. Background Art

[0002] At present, the heat dissipation of magnetic levitation rotating machinery 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, the air is sucked from the magnetic levitation rotating machinery 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 bearing and 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 bearing and a magnetic suspension rotating machine.

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

[0007] Axial stator 1, axial stator 2 and 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, the axial stator 1 includes 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;

[0008] The thrust plate is provided with a thrust plate ventilation hole extending from one axial end surface to the other axial end surface, and the thrust plate ventilation hole is not opposite to the magnetic pole position of the axial stator 1, and / or the thrust plate ventilation hole is not opposite to the magnetic pole position of the axial stator 2.

[0009] In some embodiments,

[0010] The magnetic pole position of the axial stator 1 includes the radial outer portion 1 opposite to the thrust disk, and the radial inner portion 1 opposite to the thrust disk. In the axial direction, the thrust disk ventilation hole is located at a position opposite to the gap between the radial inner periphery of the radial inner portion 1 and the rotor.

[0011] In some embodiments,

[0012] The axial stator 2 includes a radial outer portion 2 and a radial inner portion 2, wherein the radial outer portion 2 and the radial inner portion 2 are spaced apart in the radial direction of the axial stator 2, and a coil slot 2 is formed therebetween, in which a coil 2 is arranged; the magnetic pole position of the axial stator 2 includes a portion of the radial outer portion 2 opposite to the thrust disk, and a portion of the radial inner portion 2 opposite to the thrust disk, and in the axial direction, the thrust disk ventilation hole is located at a position opposite to the gap between the radial inner periphery of the radial inner portion 2 and the rotor.

[0013] In some embodiments,

[0014] The diameter of the ventilation hole of the thrust plate is smaller than the radial distance between the first radial inner portion and the rotor, and the diameter of the ventilation hole of the thrust plate is smaller than the radial distance between the second radial inner portion and the rotor.

[0015] In some embodiments,

[0016] It also includes a shell, which is located at the outer periphery of the axial stator 1, and the shell is also located at the outer periphery of the axial stator 2; the axial stator 1 also includes an axial outer portion 1, which is arranged away from the thrust plate relative to the coil 1 in the axial direction of the magnetic bearing, and the radial outer periphery of the axial outer portion 1 extends to connect with the shell;

[0017] The second axial stator also includes a second axial outer portion, which is arranged away from the thrust plate relative to the second coil in the axial direction of the magnetic bearing, and the radial outer periphery of the second axial outer portion extends to connect with the shell.

[0018] In some embodiments,

[0019] The axial outer portion 1 is provided with a bearing stator ventilation hole 1, the bearing stator ventilation hole 1 penetrates from one axial end surface of the axial outer portion 1 to the other axial end surface, and the bearing stator ventilation hole 1 is located at the radial outer periphery of the radial outer portion 1.

[0020] The radial outer portion 1, the thrust plate and the radial outer portion 2 are all spaced apart from the housing in the radial direction to form an airflow circulation space.

[0021] The second axial outer portion is provided with a second bearing stator ventilation hole, the second bearing stator ventilation hole penetrates from one axial end surface of the second axial outer portion to the other axial end surface, and the second bearing stator ventilation hole is located at the radial outer periphery of the second radial outer portion;

[0022] The first bearing stator ventilation hole, the airflow circulation space and the second bearing stator ventilation hole are connected in sequence to form an airflow circulation passage.

[0023] In some embodiments,

[0024] Along the axial direction of the thrust plate, the 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 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.

[0025] In some embodiments,

[0026] There are multiple thrust plate ventilation holes, which are arranged at intervals along the circumferential direction of the thrust plate, and each thrust plate ventilation hole extends from the axial end surface of the air inlet side of the thrust plate toward the axial end surface of the air outlet side toward the second rotation direction, which is opposite to the first rotation direction of the thrust plate.

[0027] The present invention also provides a magnetic suspension rotating machine, which includes the above-mentioned magnetic suspension bearing.

[0028] The magnetic suspension bearing and magnetic suspension rotating machine provided by the present invention have the following beneficial effects:

[0029] 1. The present invention realizes active air suction and heat exchange through high rotation speed through the 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, improves the cooling and heat dissipation effect of the magnetic suspension bearing, and makes the thrust plate ventilation holes not opposite to the magnetic pole positions of the axial stators one and two, 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, which can effectively avoid the cooling gas and the opening from affecting the magnetic furnace structure, thereby avoiding the magnetic suspension axial The supporting force is insufficient, which can improve the heat dissipation and cooling of the magnetic levitation bearing while avoiding the impact on the magnetic levitation magnetic circuit, ensuring sufficient magnetic levitation supporting force, and effectively reducing the impact of the gas force on the axial force; the present invention also preferably arranges the thrust plate ventilation hole in the gap between the axial lower magnetic pole and the rotor, and the aperture size is ≤ the radial spacing between the axial lower magnetic pole of the stator and the rotor, which can enable the thrust plate ventilation hole to further effectively avoid the magnetic pole position, further avoid the impact on the magnetic circuit, and the thrust plate ventilation hole is connected to the ventilation paths at both ends without obstruction, which can also make the airflow resistance at both ends of the thrust plate small and the fluidity good.

[0030] 2. The present invention can also form a second airflow channel that allows airflow through the bearing stator ventilation hole 1 opened on the axial outer portion 1 of the axial stator 1, the bearing stator ventilation hole 2 opened on the axial outer portion 2 of the axial stator 2, and the airflow circulation space formed between the shell and the radial outer portion 1, the radial outer portion 2 and the thrust plate, which can further enhance the cooling and heat dissipation of the magnetic suspension bearing stator and improve the cooling and heat dissipation effect of the magnetic suspension bearing. The second airflow channel is located radially outside the magnetic pole position of the bearing stator 1 and also radially outside the magnetic pole position of the bearing stator 2. It can make them not relative to the magnetic pole positions of the axial stators one and two, so that the cooling air cannot directly reach the magnetic pole gap position, which can further effectively avoid the cooling gas and the openings from affecting the magnetic furnace structure, thereby avoiding insufficient axial supporting force of the magnetic suspension, achieving improved heat dissipation and cooling of the magnetic suspension bearing while avoiding affecting the magnetic suspension magnetic circuit, ensuring sufficient magnetic suspension supporting force, and effectively reducing the influence of the gas force on the axial force, and the second air flow channel is connected to the ventilation paths at both ends without obstruction, is located on the outside of the thrust plate, will not affect the thrust plate, and has good fluidity.

[0031] 3. The present invention also sets the thrust plate ventilation hole to extend from one axial end face to the other axial end face toward the second rotation direction, and the second rotation direction is opposite to the first rotation direction (the rotation direction of the thrust plate). When the rotor drives the thrust plate to rotate at high speed, negative pressure is generated to suck out the hot air at one end and discharge it to the outside, thereby increasing the gas flow rate, realizing active ventilation and heat exchange of the thrust plate itself, accelerating gas flow, saving energy consumption, improving heat dissipation performance and energy efficiency; at the same time, in conjunction with the bearing stator ventilation 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 to realize effective autonomous heat dissipation of the axial coil and the thrust plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a longitudinal sectional view of embodiment 1 of the magnetic bearing of the present invention;

[0033] Figure 2 yes Figure 1 The planar structural diagram of the thrust plate structure in FIG. 1 (thrust plate ventilation hole with right-handed inclined hole);

[0034] Figure 3 is a longitudinal sectional view of a second embodiment of the magnetic bearing of the present invention;

[0035] Figure 4 yes Figure 3 Planar structural diagram of the thrust plate structure (thrust plate ventilation hole with left-handed inclined hole).

[0036] The reference numerals are as follows:

[0037] 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. Housing; 5. Coil 1; 5', Coil 2; 6. Rotor;

[0038] 01. Thrust plate ventilation hole; 02. Air flow space; 03. Bearing stator ventilation hole 1; 03', bearing stator ventilation hole 2. DETAILED DESCRIPTION

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] like Figure 1-4 As shown, the present invention provides a magnetic bearing, which includes:

[0046] An axial stator 1, an axial stator 2 and a thrust plate 3. In the axial direction of the magnetic bearing, the thrust plate 3 is arranged between the axial stator 1 and the axial stator 2. A thrust plate ventilation hole 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 between the two, and a coil 5 is provided in the coil slot 13.

[0047] The thrust plate 3 is provided with a thrust plate ventilation hole 01 extending from one axial end face to the other axial end face, and the thrust plate ventilation hole 01 is not opposite to the magnetic pole position of the axial stator 1, and / or the thrust plate ventilation hole 01 is not opposite to the magnetic pole position of the axial stator 2.

[0048] The present invention realizes active air suction and heat exchange through high rotation speed through the thrust plate ventilation holes opened on the thrust plate, increases the gas flow rate introduced, and accelerates the cooling of the axial magnetic bearing. It can actively cool the thrust plate itself and increase the cooling flow rate to accelerate the heat dissipation of the axial coil, thereby improving the cooling and heat dissipation effect of the magnetic suspension bearing. The thrust plate ventilation holes are not opposite to the magnetic pole positions of the axial stators one and two, 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 the cooling gas and the openings can be effectively prevented 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.

[0049] In some embodiments,

[0050] The magnetic pole position of the axial stator 1 includes a portion of the radial outer portion 11 opposite to the thrust disk 3, and a portion of the radial inner portion 12 opposite to the thrust disk 3. In the axial direction, the thrust disk ventilation hole 01 is located at a position opposite to the gap between the radial inner periphery of the radial inner portion 12 and the rotor 6.

[0051] The present invention also preferably arranges the thrust plate ventilation hole at a position opposite to the gap between the axial stator 1 and the rotor, which can further enable the thrust plate ventilation hole to further effectively avoid the magnetic pole position of the axial stator 1, further avoid affecting the magnetic circuit, and the thrust plate ventilation hole is connected to the ventilation paths at both ends without obstruction, which can also reduce the airflow resistance at both ends of the thrust plate and improve the fluidity.

[0052] In some embodiments,

[0053] The axial stator 2 includes a radial outer portion 21 and a radial inner portion 22, the radial outer portion 21 and the radial inner portion 22 are spaced apart in the radial direction of the axial stator 2, and a coil slot 23 is formed therebetween, a coil 5' is arranged in the coil slot 23; the magnetic pole position of the axial stator 2 includes a portion of the radial outer portion 21 opposite to the thrust disk 3, and a portion of the radial inner portion 22 opposite to the thrust disk 3, and in the axial direction, the thrust disk ventilation hole 01 is located at a position opposite to the gap between the radial inner periphery of the radial inner portion 22 and the rotor 6.

[0054] The present invention also preferably arranges the thrust plate ventilation hole at a position opposite to the gap between the axial stator 2 and the rotor, which can further enable the thrust plate ventilation hole to further effectively avoid the magnetic pole position of the axial stator 2, further avoiding affecting the magnetic circuit, and the thrust plate ventilation hole is connected to the ventilation paths at both ends without obstruction, which can also reduce the airflow resistance at both ends of the thrust plate and improve the fluidity.

[0055] In some embodiments,

[0056] The aperture of the thrust plate ventilation hole 01 is smaller than the radial distance between the radial inner portion 12 and the rotor 6 , and the aperture of the thrust plate ventilation hole 01 is smaller than the radial distance between the radial inner portion 22 and the rotor 6 .

[0057] The present invention also preferably arranges the thrust plate ventilation holes in the gap between the axial lower magnetic pole and the rotor, and the hole size is ≤ the radial spacing between the axial lower magnetic pole of the stator and the rotor, so that the thrust plate ventilation holes can further effectively avoid the magnetic pole position and further avoid affecting the magnetic circuit. The thrust plate ventilation holes are connected to 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.

[0058] In some embodiments,

[0059] It also includes a shell 4, which is located at the outer periphery of the axial stator 1, and the shell 4 is also located at the outer periphery of the axial stator 2; the axial stator 1 also includes an axial outer portion 14, which is arranged away from the thrust plate 3 relative to the coil 5 in the axial direction of the magnetic bearing, and the radial outer periphery of the axial outer portion 14 extends to connect with the shell 4;

[0060] The axial stator 2 further includes an axial outer portion 24 , which is arranged away from the thrust plate 3 relative to the coil 2 5 ′ in the axial direction of the magnetic bearing, and the radial outer periphery of the axial outer portion 24 extends to connect with the housing 4 .

[0061] The present invention also adopts a preferred structural form arranged between the axial stator 1 and the axial stator 2 and the shell, that is, the axial stator 1 and the axial stator 2 can be fixed to the outer shell through the axial outer part 1 and the axial outer part 2 respectively, and the space for gas flow can be formed between the shell and the thrust plate, and the radial outer parts 1 and 2, so as to further enhance the cooling and heat dissipation effect of the stator and the shell.

[0062] In some embodiments,

[0063] The axial outer portion 14 is provided with a bearing stator ventilation hole 03, and the bearing stator ventilation hole 03 penetrates from one axial end surface of the axial outer portion 14 to the other axial end surface, and the bearing stator ventilation hole 03 is located at the radial outer periphery of the radial outer portion 11.

[0064] The radial outer portion 11, the thrust plate 3 and the radial outer portion 21 are all spaced apart from the housing 4 in the radial direction to form an airflow circulation space 02.

[0065] The second axial outer portion 24 is provided with a bearing stator ventilation hole 03', the bearing stator ventilation hole 03' penetrates from one axial end surface of the second axial outer portion 24 to the other axial end surface, and the bearing stator ventilation hole 03' is located at the radial outer periphery of the second radial outer portion 21;

[0066] The bearing stator ventilation hole 1 03, the airflow circulation space 02 and the bearing stator ventilation hole 2 03' are connected in sequence to form an airflow circulation passage.

[0067] The present invention can also form a second airflow channel allowing airflow through the bearing stator ventilation hole 1 opened on the axial outer side 1 of the axial stator 1, the bearing stator ventilation hole 2 opened on the axial outer side 2 of the axial stator 2, and the airflow circulation space formed between the shell and the radial outer side 1, the radial outer side 2 and the thrust plate, which can further enhance the cooling and heat dissipation of the magnetic suspension bearing stator and improve the cooling and heat dissipation effect of the magnetic suspension bearing. The second airflow channel is located radially outside the magnetic pole position of the bearing stator 1 and also radially outside the magnetic pole position of the bearing stator 2, which can It is enough to make them not relative to the magnetic pole positions of the axial stators one and two, so that the cooling air cannot directly reach the magnetic pole gap position, which can further effectively avoid the cooling gas and the openings from affecting the magnetic furnace structure, thereby avoiding insufficient axial supporting force of the magnetic suspension, achieving improved heat dissipation and cooling of the magnetic suspension bearing while avoiding affecting the magnetic suspension magnetic circuit, ensuring sufficient magnetic suspension supporting force, and effectively reducing the influence of the gas force on the axial force, and the second air flow channel is connected to the ventilation paths at both ends without obstruction, is located on the outside of the thrust plate, will not affect the thrust plate, and has good fluidity.

[0068] In some embodiments,

[0069] Along the axial direction of the thrust plate 3, the 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 a first rotation direction, and the extension direction of the 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 a second rotation direction, and the second rotation direction is opposite to the first rotation direction.

[0070] The present invention also arranges the ventilation hole of the thrust plate so that the extension direction from the axial end face on the air inlet side toward the axial end face on the air outlet side is toward the second rotation direction, and the second rotation direction is opposite to the first rotation direction (the rotation direction of the thrust plate). When the rotor drives the thrust plate to rotate at 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 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.

[0071] In some embodiments,

[0072] There are multiple thrust plate ventilation holes 01, which are arranged at intervals along the circumferential direction of the thrust plate 3, and the extension direction of each thrust plate ventilation hole 01 from the axial end face on the air inlet 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.

[0073] The present invention proposes a magnetic levitation rotating machine (preferably a blower) with active and efficient heat dissipation. The thrust plate 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 at the other end of the main impeller is used for cooling, or the rotor is rotated under negative pressure for cooling, or the main impeller is leaked for cooling. The previous external passive heat dissipation is changed to internal active heat dissipation, which improves the heat dissipation efficiency and reduces 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.

[0074] The axial magnetic bearing of the present invention preferably adopts active ventilation cooling. The thrust plate is installed on the rotor, with an inclined hole between the two magnetic poles of the thrust plate, and several inclined holes are opened in the circumferential direction of the thrust plate. 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.

[0075] According to the principle of axial magnetic bearing, the relative position between 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 influence 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. If the position of the thrust plate oblique hole opening is opened outside the magnetic circuit to avoid affecting the magnetic circuit, it is preferably located in the non-magnetic part of the inner ring of the axial lower magnetic pole, and the aperture size is less than the radial spacing between the axial stator lower magnetic pole and the rotor, and there are ventilation flow channels on both sides of the hole, and there is no obstruction at both ends. The airflow resistance at both ends is small and the flow is good.

[0076] The heat dissipation of the entire system of the present invention preferably adopts an active pure air-cooled heat dissipation 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 heat dissipation cold air flow rate is adjusted by the motor speed. No additional controller is required. The overall internal flow channel layout guides the cold air to each component for targeted heat dissipation. The entire heat dissipation system has a simple structure and the heat dissipation process is efficient and reliable.

[0077] The beneficial effects of the present invention are as follows:

[0078] 1. The present invention sets an inclined hole in the non-magnetic part of the thrust plate for high-heat generating components, and uses negative pressure to absorb heat through the inclined 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. Targeted ventilation of heat generating components can effectively accelerate cooling and improve reliability, increase cooling flow without affecting the axial magnetic circuit;

[0079] 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 magnetic levitation rotating machinery 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 magnetic levitation rotating machinery has sufficient heat dissipation air volume under various working conditions. The cold air is directly driven by the motor rotor, the control logic is simple, and the heat dissipation system has high reliability.

[0080] 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.

[0081] Figure 1 , Figure 3The figure shows the internal axial bearing cooling path of the magnetic levitation machinery (preferably a blower) of the present invention. An inclined hole (thrust plate ventilation hole 01) is opened on the thrust plate 3, and bearing stator ventilation holes are provided on the axial stator one / two. This cooling path is divided into two heat dissipation paths. The first path: during operation, the air intake direction of the thrust plate inclined hole is opposite to the rotation direction of the rotor. The thrust plate uses negative pressure to absorb the heat dissipation gas from the left end. During operation, the heat at the left end is sucked from the lower cavity of the axial stator into the lower cavity of the axial stator two through the thrust plate inclined hole flow channel, increasing the gas flow rate and accelerating heat exchange; the second path: the cooling gas flows rapidly through the ventilation holes on the axial stator, effectively exchanging heat for the axial stator; the two paths are ventilated at the same time to accelerate the gas discharge and heat dissipation, and cooperate with the cooling path of the overall solution to achieve an effective heat dissipation effect. 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 inclined 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 inclined 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, it is a left-handed inclined hole. Similarly, if the directions do not match, the heat dissipation effect will be weakened and the heat dissipation efficiency will be reduced.

[0082] 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 magnetic bearing, characterized in that: include: An axial stator (1), an axial stator (2) and a thrust plate (3), wherein the thrust plate (3) is arranged between the axial stator (1) and the axial stator (2) in the axial direction of the magnetic bearing, 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) being arranged at intervals in the radial direction of the axial stator (1), and a coil slot (13) is formed between the two, and a coil (5) is arranged in the coil slot (13); a thrust plate ventilation hole (01) is arranged on the thrust plate (3) from one axial end face to the other axial end face thereof, and the thrust plate ventilation hole (01) is not opposite to the magnetic pole position of the axial stator (1), and / or the thrust plate ventilation hole (01) is not opposite to the magnetic pole position of the axial stator (2).

2. The magnetic bearing according to claim 1, characterized in that: The magnetic pole position of the axial stator (1) includes a portion of the radial outer portion (11) opposite to the thrust disk (3), and a portion of the radial inner portion (12) opposite to the thrust disk (3), and in the axial direction, the thrust disk ventilation hole (01) is located at a position opposite to the gap between the radial inner periphery of the radial inner portion (12) and the rotor (6).

3. The magnetic bearing according to claim 2, characterized in that: The axial stator 2 (2) includes a radial outer portion 2 (21) and a radial inner portion 2 (22), wherein 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, wherein a coil 2 (5') is arranged in the coil slot 2 (23); the magnetic pole position of the axial stator 2 (2) includes a portion of the radial outer portion 2 (21) opposite to the thrust disk (3), and a portion of the radial inner portion 2 (22) opposite to the thrust disk (3), and in the axial direction, the thrust disk ventilation hole (01) is located at a position opposite to the gap between the radial inner periphery of the radial inner portion 2 (22) and the rotor (6).

4. The magnetic bearing according to claim 3, characterized in that: The diameter of the thrust plate ventilation hole (01) is smaller than the radial distance between the radial inner part 1 (12) and the rotor (6), and the diameter of the thrust plate ventilation hole (01) is smaller than the radial distance between the radial inner part 2 (22) and the rotor (6).

5. The magnetic bearing according to claim 3 or 4, characterized in that: It also includes a shell (4), the shell (4) is located on the outer periphery of the axial stator 1 (1), and the shell (4) is also located on the outer periphery of the axial stator 2 (2); the axial stator 1 (1) also includes an axial outer portion 1 (14), the axial outer portion 1 (14) is arranged in the axial direction of the magnetic bearing relative to the coil 1 (5) and away from the thrust plate (3), and the radial outer periphery of the axial outer portion 1 (14) extends to connect with the shell (4); The axial stator 2 (2) also includes 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 plate (3), and the radial outer periphery of the axial outer portion 2 (24) extends to connect with the shell (4).

6. The magnetic bearing according to claim 5, characterized in that: The axial outer portion (14) is provided with a bearing stator ventilation hole (03), the bearing stator ventilation hole (03) penetrates from one axial end surface of the axial outer portion (14) to the other axial end surface, and the bearing stator ventilation hole (03) is located on the radial outer periphery of the radial outer portion (11), The radial outer portion 1 (11), the thrust plate (3) and the radial outer portion 2 (21) are all spaced apart from the housing (4) in the radial direction to form an airflow circulation space (02). The second axial outer portion (24) is provided with a second bearing stator ventilation hole (03'), the second bearing stator ventilation hole (03') penetrates from one axial end surface of the second axial outer portion (24) to the other axial end surface, and the second bearing stator ventilation hole (03') is located on the radial outer periphery of the second radial outer portion (21); The bearing stator ventilation hole 1 (03), the airflow circulation space (02) and the bearing stator ventilation hole 2 (03') are connected in sequence to form an airflow circulation passage.

7. The magnetic bearing according to any one of claims 1 to 6, characterized in that: Along the axial direction of the thrust plate (3), the 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 thrust plate ventilation hole (01) extends 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 toward a second rotation direction, and the second rotation direction is opposite to the first rotation direction.

8. The magnetic bearing according to claim 7, characterized in that: There are a plurality of thrust plate ventilation holes (01), which are arranged at intervals along the circumferential direction of the thrust plate (3), and an extension direction of each thrust plate ventilation hole (01) from an axial end face on an air inlet side of the thrust plate toward an axial end face on an air outlet side is oriented toward a second rotation direction, which is opposite to the first rotation direction of the thrust plate (3).

9. A magnetically suspended rotating machine, characterized in that: The invention comprises the magnetic bearing according to any one of claims 1 to 8.

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