Axial magnetic suspension bearing and magnetic suspension rotating machine

Abstract

The utility model provides an axial magnetic suspension bearing and a magnetic suspension rotating machine, which comprise an outer cylinder, two axial stator assemblies and a thrust disc are assembled in the outer cylinder, the first axial stator assembly comprises a first stator iron core and a first winding, and the second axial stator assembly comprises a second stator iron core and a second winding. The thrust disc is located between the magnetic poles of the two stator iron cores, the magnetic poles of the first stator iron core comprise a first outer magnetic pole and a first inner magnetic pole, the magnetic poles of the second stator iron core comprise a second outer magnetic pole and a second inner magnetic pole, and outer overflowing grooves are formed in the magnetic pole end faces of the first outer magnetic pole and the second outer magnetic pole. Inner overflowing grooves are formed in the magnetic pole end faces of the first inner magnetic pole and the second inner magnetic pole, and the outer overflowing grooves and the inner overflowing grooves extend in the radial direction of the thrust disc. The internal structure of the bearing can be effectively cooled.

Description

Technical Field

[0001] The utility model belongs to the technical field of magnetic levitation bearing design, and particularly relates to an axial magnetic levitation bearing and a magnetic levitation rotating machine. Background Art

[0002] At present, the heat dissipation of magnetic levitation blowers mainly relies on external cooling equipment, such as external cooling fans, water cooling systems, and heat exchangers, etc. The equipment maintenance cost is high, the structure system is complex, and potential safety hazards are increased. Or in the form of negative pressure, air is sucked from the blower to guide heat out, which cannot more effectively achieve the heat dissipation of internal components, especially the heat dissipation of axial magnetic bearings is insufficient, affecting the stable operation of magnetic levitation blowers.

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

[0004] Therefore, the utility model provides an axial magnetic levitation bearing and a magnetic levitation rotating machine, which can solve the technical problems of serious heat generation and low heat dissipation efficiency of the axial magnetic bearing in the existing magnetic levitation rotating machine.

[0005] To solve the above problems, the utility model provides an axial magnetic levitation bearing, which includes an outer cylinder. A first axial stator assembly, a second axial stator assembly, and a thrust disk are assembled in the central through hole of the outer cylinder. The first axial stator assembly includes a first stator core and a first winding assembled on the first stator core. The second axial stator assembly includes a second stator core and a second winding assembled on the second stator core. The thrust disk is located between the magnetic poles of the first stator core and the magnetic poles of the second stator core. The magnetic poles of the first stator core include a first outer magnetic pole and a first inner magnetic pole. The magnetic poles of the second stator core include a second outer magnetic pole and a second inner magnetic pole. Outer flow grooves are formed on the magnetic pole end faces of the first outer magnetic pole and the second outer magnetic pole. Inner flow grooves are formed on the magnetic pole end faces of the first inner magnetic pole and the second inner magnetic pole. Each of the outer flow grooves and the inner flow grooves extends along the radial direction of the thrust disk.

[0006] In some embodiments, there are a plurality of the outer overflow grooves, and the plurality of outer overflow grooves are arranged at intervals in the circumferential direction around the thrust disk. There are a plurality of the inner overflow grooves, and the plurality of inner overflow grooves are arranged at intervals in the circumferential direction around the thrust disk.

[0007] In some embodiments, the first outer magnetic pole includes a first cover plate portion extending radially inward along the thrust disk, the second outer magnetic pole includes a second cover plate portion extending radially inward along the thrust disk, and the outer overflow grooves are located on the first cover plate portion and the second cover plate portion.

[0008] In some embodiments, the plane perpendicular to the rotating shaft of the thrust disk is the radial plane. In the projection on the radial plane, the radius of the outer circumferential wall of the thrust disk is smaller than the radius of the radially outer groove wall of the outer overflow groove, and the radius of the radially outer groove wall of the outer overflow groove is smaller than the radius of the outer circumferential wall of the first cover plate portion. The outer overflow groove penetrates the outer ring wall of the first outer magnetic pole or the second outer magnetic pole along the radial direction of the thrust disk; the inner overflow groove penetrates the inner and outer ring walls of the first inner magnetic pole or the second inner magnetic pole along the radial direction of the thrust disk.

[0009] In some embodiments, the first stator core further includes a first stator yoke portion between the first outer magnetic pole and the first inner magnetic pole, the second stator core further includes a second stator yoke portion between the second outer magnetic pole and the second inner magnetic pole. The first stator yoke portion has a first outer convex ring protruding from the radially outer ring wall of the first outer magnetic pole, and the second stator yoke portion has a second outer convex ring protruding from the radially outer ring wall of the second outer magnetic pole. The first axial stator assembly is assembled into the outer cylinder via the first outer convex ring, and the second axial stator assembly is assembled into the outer cylinder via the second outer convex ring to form a cooling cavity between the first outer magnetic pole and the outer cylinder and between the second outer magnetic pole and the outer cylinder. The outer overflow grooves of the first stator core and the outer overflow grooves of the second stator core are communicated by the cooling cavity.

[0010] The present utility model further provides a magnetic levitation rotating machine, including a rotating shaft and an axial magnetic levitation bearing for limiting the axial displacement of the rotating shaft. The axial magnetic levitation bearing is the above-mentioned axial magnetic levitation bearing. Cooling air flow can sequentially enter the axial magnetic levitation bearing through the inner overflow grooves and outer overflow grooves in the stator core on one side and sequentially flow out of the axial magnetic levitation bearing through the outer overflow grooves and inner overflow grooves in the stator core on the other side.

[0011] In some embodiments, the first end of the rotating shaft is connected to a blower turbine, the second end of the rotating shaft is connected to a cooling impeller, and the cooling air flow is introduced by and / or drawn from the blower turbine by the cooling impeller.

[0012] In some embodiments, the first end of the rotating shaft is connected to a blower turbine. An air guiding channel extending from the end face of the second end towards the first end is formed inside the rotating shaft, and the cooling air flow is introduced into the air guiding channel by the rotating shaft during rotation by means of centrifugal force.

[0013] In some embodiments, the magnetic levitation rotating machine further includes a cylinder body. An electric motor stator capable of driving the rotating shaft to rotate is assembled inside the cylinder body, and a stator cooling flow channel is formed in a region corresponding to the electric motor stator inside the cylinder body.

[0014] In some embodiments, a water cooling flow channel is further formed inside the cylinder body, and the water cooling flow channel is arranged around the outer side of the stator cooling flow channel.

[0015] An axial magnetic levitation bearing and a magnetic levitation rotating machine provided by the present utility model have the following beneficial effects:

[0016] An outer overflow groove and an inner overflow groove extending radially inwards and outwards respectively are provided in the first axial stator assembly and the second axial stator assembly, so as to guide the cooling air flow outside the bearing into the bearing and then out, thereby increasing the amount of cooling air flow entering the bearing, and thus realizing efficient heat dissipation and cooling of the windings, stator cores and thrust disks inside the bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. The drawings in the following description are merely exemplary, and for those of ordinary skill in the art, other implementation drawings can be obtained by extension based on the provided drawings without creative efforts.

[0018] Figure 1 is a schematic internal structure diagram (half-section) of an axial magnetic levitation bearing according to an embodiment of the present utility model, and the cooling air flow passes through the inside of the axial magnetic levitation bearing from right to left;

[0019] Figure 2 is Figure 1 the sectional view taken along line A-A in

[0020] Figure 3 is a schematic internal structure diagram (three-dimensional half-section) of an axial magnetic levitation bearing according to an embodiment of the present utility model, and the cooling air flow passes through the inside of the axial magnetic levitation bearing from right to left;

[0021] Figure 4 is a schematic internal structure diagram of a first embodiment of the magnetic levitation rotating machine of the present utility model, and the arrows in the figure show the flow path of the cooling air flow;

[0022] Figure 5 It is a schematic diagram of the internal structure of the second embodiment of the magnetic levitation rotating machine of the present utility model. The arrows in the figure show the flow path of the cooling air flow;

[0023] Figure 6 It is a schematic diagram of the internal structure of the third embodiment of the magnetic levitation rotating machine of the present utility model. The arrows in the figure show the flow path of the cooling air flow;

[0024] Figure 7 It is a schematic diagram of the internal structure of the fourth embodiment of the magnetic levitation rotating machine of the present utility model. The arrows in the figure show the flow path of the cooling air flow;

[0025] Figure 8 It is a schematic diagram of the internal structure of the fifth embodiment of the magnetic levitation rotating machine of the present utility model. The arrows in the figure show the flow path of the cooling air flow.

[0026] The reference signs are as follows:

[0027] 1. Outer cylinder; 2. First axial stator assembly; 21. First stator core; 211. First outer magnetic pole; 2111. First cover part; 212. First inner magnetic pole; 213. First stator yoke part; 22. First winding; 3. Second axial stator assembly; 31. Second stator core; 311. Second outer magnetic pole; 3111. Second cover part; 312. Second inner magnetic pole; 313. Second stator yoke part; 32. Second winding; 4. Thrust disk; 51. Outer flow-through groove; 52. Inner flow-through groove; 100. Rotating shaft; 1001. Air intake channel; 101. Axial magnetic levitation bearing; 1022. Front end cover; 103. Cooling impeller; 1031. Rear end cover; 1032. Deflector; 104. Radial magnetic levitation bearing; 1041. Front housing; 1042. Rear housing; 105. Motor stator; 106. Cylinder; 1061. Exhaust hole; 1062. Stator cooling flow channel; 1063. Water cooling flow channel; 107. Auxiliary heat dissipation fan blade. Detailed implementation manners

[0028] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. The description of at least one exemplary embodiment below is actually only illustrative and in no way restrictive of the present utility model and its application or use. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0029] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom", etc. is usually based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description. Without contrary description, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the protection scope of the present utility model; the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0030] For the convenience of description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "above" etc. can be used here to describe the spatial positional relationship between a device or feature shown in the drawings and other devices or features. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation described in the drawings for the device. For example, if the device in the drawing is inverted, the device described as "above other devices or structures" or "over other devices or structures" will then be positioned as "below other devices or structures" or "under other devices or structures". Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device can also be positioned in other different ways (rotated 90° or in other orientations), and the corresponding explanations are made for the spatial relative descriptions used here.

[0031] In addition, it should be noted that the use of words such as "first", "second" etc. to limit the components is only for the convenience of differentiating the corresponding components. Without additional statement, the above words have no special meaning. Therefore, it should not be construed as a limitation on the protection scope of the present utility model.

[0032] See in conjunction with Figures 1 to 8As shown, according to an embodiment of the present utility model, an axial magnetic levitation bearing is provided, which includes an outer cylinder 1 (in some cases, the outer cylinder 1 can be, for example, the cylinder 106 hereinafter). A first axial stator assembly 2, a second axial stator assembly 3, and a thrust disc 4 are assembled in the central through hole of the outer cylinder 1. The first axial stator assembly 2 includes a first stator core 21 and a first winding 22 assembled on the first stator core 21. The second axial stator assembly 3 includes a second stator core 31 and a second winding 32 assembled on the second stator core 31. The thrust disc 4 is located between the magnetic poles of the first stator core 21 and the magnetic poles of the second stator core 31, and corresponding air gaps are respectively formed between the thrust disc 4 and the first stator core 21 and between the thrust disc 4 and the second stator core 31. The magnetic poles of the first stator core 21 include a first outer magnetic pole 211 and a first inner magnetic pole 212, and the magnetic poles of the second stator core 31 include a second outer magnetic pole 311 and a second inner magnetic pole 312. Outer current-carrying grooves 51 are formed on the magnetic pole end faces of the first outer magnetic pole 211 and the second outer magnetic pole 311, and inner current-carrying grooves 52 are formed on the magnetic pole end faces of the first inner magnetic pole 212 and the second inner magnetic pole 312. Each of the outer current-carrying grooves 51 and the inner current-carrying grooves 52 extends along the radial direction of the thrust disc 4.

[0033] In this technical solution, outer current-carrying grooves 51 and inner current-carrying grooves 52 that extend radially inwards and outwards respectively are provided in the first axial stator assembly 2 and the second axial stator assembly 3, so as to guide the cooling air flow outside the bearing into the bearing and then out, thereby increasing the amount of cooling air flowing into the bearing, and thus realizing efficient heat dissipation and cooling for the windings, stator cores, and thrust disc inside the bearing.

[0034] It can be understood that the cooling air flow in this technical solution realizes inflow and outflow by means of the pressure difference at both axial ends of the bearing.

[0035] In some embodiments, there are multiple outer current-carrying grooves 51, and the multiple outer current-carrying grooves 51 are arranged at intervals around the circumferential direction of the thrust disc 4. There are multiple inner current-carrying grooves 52, and the multiple inner current-carrying grooves 52 are arranged at intervals around the circumferential direction of the thrust disc 4.

[0036] In this technical solution, by circumferentially arranging multiple cooling flow channel current-carrying grooves, uniform cooling and heat dissipation inside the axial magnetic levitation bearing can be realized.

[0037] In some embodiments, the first outer magnetic pole 211 includes a first cover plate portion 2111 that extends radially inwards along the thrust disc 4, the second outer magnetic pole 311 includes a second cover plate portion 3111 that extends radially inwards along the thrust disc 4, and the outer current-carrying grooves 51 are located on the first cover plate portion 2111 and the second cover plate portion 3111.

[0038] The foregoing first cover plate portion 2111 and second cover plate portion 3111 are specifically both an annular plate, which, as a part of the stator core, is used to conduct the magnetic circuit formed by the corresponding windings. Since it extends radially inwards along the thrust disk 4, the outer diameter of the corresponding thrust disk 4 can be designed to be smaller, thereby reducing the eccentric mass of the rotating shaft and being beneficial to improving the dynamic balance performance of the rotating shaft.

[0039] In some embodiments, the plane of the rotating shaft perpendicular to the thrust disk 4 is a radial plane. In the projection on the radial plane, the radius of the outer circumferential wall of the thrust disk 4 is smaller than the radius of the outer radial groove wall of the outer flow-through groove 51, and the radius of the outer radial groove wall of the outer flow-through groove 51 is smaller than the radius of the outer circumferential wall of the first cover plate portion 2111. The outer flow-through groove 51 penetrates the outer ring wall of the first outer magnetic pole 211 or the second outer magnetic pole 311 along the radius of the thrust disk 4, that is, the outer flow-through groove 51 does not penetrate the inner and outer ring walls of the corresponding cover plate portion. In this way, while ensuring an increase in the flow-through gap between the magnetic pole end face and the thrust disk 4 and improving the inflow and outflow of the cooling air flow, the adverse effect on the magnetic lines of force due to the setting of the groove can be reduced as much as possible; the inner flow-through groove 52 penetrates the inner and outer ring walls of the first inner magnetic pole 212 or the second inner magnetic pole 312 along the radius of the thrust disk 4 to ensure the inflow and outflow of the cooling air flow in the gap between the inner magnetic pole and the thrust disk 4.

[0040] In some embodiments, the first stator core 21 further includes a first stator yoke portion 213 between the first outer magnetic pole 211 and the first inner magnetic pole 212, and the second stator core 31 further includes a second stator yoke portion 313 between the second outer magnetic pole 311 and the second inner magnetic pole 312. The first stator yoke portion 213 has a first outer convex ring (not labeled in the figure) protruding from the outer radial ring wall of the first outer magnetic pole 211, and the second stator yoke portion 313 has a second outer convex ring (not labeled in the figure) protruding from the outer radial ring wall of the second outer magnetic pole 311. The first axial stator assembly 2 is assembled into the outer cylinder 1 via the first outer convex ring, and the second axial stator assembly 3 is assembled into the outer cylinder 1 via the second outer convex ring to form a cooling cavity (not labeled in the figure) between the first outer magnetic pole 211 and the outer cylinder 1 and between the second outer magnetic pole 311 and the outer cylinder 1. The outer flow-through groove 51 of the first stator core 21 is communicated with the outer flow-through groove 51 of the second stator core 31 by the cooling cavity.

[0041] In this technical solution, an outwardly convex ring is arranged radially outward on the stator yoke, so that a corresponding cooling cavity is formed between the stator core and the outer cylinder 1. At the same time, the outer overflow grooves 51 in the axial stator assemblies on both sides communicate with this cooling cavity, so that the stator core can be cooled more efficiently and sufficiently, and further prevent the temperature rise of the bearing from being too high.

[0042] According to an embodiment of the present invention, with reference to Figures 4 to 8 As shown, there is also provided a magnetic levitation rotating machine, such as a blower, an air compressor, etc., including a rotating shaft 100 and an axial magnetic levitation bearing 101 for defining the axial displacement of the rotating shaft 100. The axial magnetic levitation bearing 101 is the above-mentioned axial magnetic levitation bearing. The cooling air flow can sequentially enter the axial magnetic levitation bearing through the inner overflow groove 52 and the outer overflow groove 51 in the stator core on one side and then flow out of the axial magnetic levitation bearing through the outer overflow groove 51 and the inner overflow groove 52 in the stator core on the other side. It can be understood that specifically which side the cooling air flow flows in and which side it flows out depends on the pressure difference formed by the air flow introduction structure of the magnetic levitation rotating machine. The side with relatively higher pressure is the air flow inlet side, and the side with relatively lower pressure is the air flow outlet side.

[0043] With reference to Figures 4 to 7 As shown, in some embodiments, the first end of the rotating shaft 100 is connected to a blower turbine (not shown in the figure), and the second end of the rotating shaft 100 is connected to a cooling impeller 103. The cooling air flow is introduced by and / or drawn from the blower turbine by the cooling impeller 103. Since the cooling impeller 103 and the blower turbine share the rotating shaft 100, when the magnetic levitation rotating machine is operating, the rotation of the cooling impeller 103 can be realized synchronously, and then the external air is introduced into the magnetic levitation rotating machine. That is, the direct drive of the cooling impeller 103 by the rotating shaft 100 is realized, without separately configuring a corresponding cooling structure for the cooling of the bearing, and without separately setting a special controller for the cooling impeller 103. The control logic is simple, the heat dissipation reliability is high, and the product cost can be reduced to a certain extent.

[0044] Figures 4 to 7 Shows the case of cooling each component in the magnetic levitation rotating machine only by the cooling air flow driven by the cooling impeller 103. The arrows in each figure indicate the flow path of the cooling air flow, and the aforementioned flow path varies according to the setting position of the exhaust hole 1061. In Figures 3 to 6 In the embodiments shown in each figure, the cooling impeller 103 rotates to drive the external air flow to enter the cylinder 106 along the guide plate 1032.

[0045] In a preferred embodiment, the cooling air flow is provided by the combined action of the cooling impeller 103 and the blower turbine, so that the introduction of the cooling air flow can be realized from both axial ends of the magnetic levitation rotating machine, thereby ensuring comprehensive cooling of various components inside the magnetic levitation rotating machine, such as the aforementioned axial magnetic levitation bearing 101, radial magnetic levitation bearing 104, and motor stator 105. In this structural form, it is preferred to set the exhaust holes 1061 in the axially central region of the cylinder 106, specifically in the region between the axial magnetic levitation bearing 101 and the motor stator 105.

[0046] Specifically refer to Figure 8 As shown, in another embodiment, the first end of the rotating shaft 100 is connected to the blower turbine, and an air guiding channel 1001 extending from the end face of the second end towards the first end is provided inside the rotating shaft 100. The cooling air flow is introduced by the rotating shaft 100 relying on centrifugal force via the air guiding channel 1001 during rotation. Specifically, corresponding air guiding structures are provided in the air guiding channel 1001 of the rotating shaft 100. When the rotating shaft 100 rotates at a high speed, external air is introduced axially inward along the rotating shaft 100 under the action of the air guiding structures in the air guiding channel 1001 and flows out from the radial through holes (not marked in the figure) on the rotating shaft 100 and is sent into the magnetic levitation rotating machine to achieve cooling of various components inside the magnetic levitation rotating machine.

[0047] Further refer to Figure 8 As shown, the radial through holes of the air guiding channel 1001 are located between the axial magnetic levitation bearing 101 and the motor stator 105, while the exhaust holes 1061 are respectively arranged at the front end position and the rear end position of the cylinder 106, thereby ensuring comprehensive and efficient cooling of the relevant components in the axial direction of the rotating shaft 100.

[0048] Specifically refer to Figure 4 and Figure 5 As shown, in some embodiments, the magnetic levitation rotating machine further includes a cylinder 106, and a motor stator 105 capable of driving the rotating shaft 100 to rotate is assembled inside the cylinder 106. A stator cooling flow channel 1062 is formed in the region corresponding to the motor stator 105 in the cylinder 106. At this time, the cooling air flow driven by the cooling impeller 103 can flow through the air gap between the motor stator and rotor and the stator cooling flow channel 1062, thereby enabling simultaneous cooling and heat dissipation of the inner and outer sides of the motor stator 105.

[0049] Specifically refer to Figure 6 As shown, in Figure 5Based on the structural foundation of the magnetic levitation rotating machine shown, a water cooling channel 1063 is further formed inside the cylinder 106. The water cooling channel 1063 is arranged around the outer side of the stator cooling channel 1062. It can be understood that the water cooling channel 1063 forms a circulation design with an external water cooling source. Through the water cooling channel 1063, the cooling air flow flowing through the stator cooling channel 1062 can be cooled, improving the overall cooling effect of the magnetic levitation rotating machine.

[0050] Specifically refer to Figure 5 As shown, corresponding heat dissipation holes (not labeled in the figure) are formed on the rear housing corresponding to the radial magnetic levitation bearing 104 (i.e., the rear-end radial magnetic levitation bearing) near the second end of the rotating shaft 100. In this way, a part of the cooling air flow driven by the cooling impeller 103 can be guided to the rear-end radial magnetic levitation bearing to cool and dissipate heat from this bearing. Further, as Figure 4 shown, auxiliary heat dissipation fan blades 107 are also sleeved on the rotating shaft 100. Specifically, two are provided, and the two auxiliary heat dissipation fan blades 107 are respectively arranged on the rotating shaft 100 corresponding to both ends of the motor stator 105, so as to further improve the heat dissipation effect and efficiency of the magnetic levitation rotating machine.

[0051] Specifically refer to Figure 5 As shown, a radial magnetic levitation bearing 104 is also sleeved on the rotating shaft 100 between the motor stator 105 and the cooling impeller 103. The cooling air flow introduced by the cooling impeller 103 also enters the radial magnetic levitation bearing 104 and then flows out under the drive of the auxiliary heat dissipation fan blades 107. Thus, a part of the cooling air flow introduced by the cooling impeller 103 into the magnetic levitation rotating machine can be introduced into the interior of the radial magnetic levitation bearing 104 under the action of the auxiliary heat dissipation fan blades 107 to form efficient cooling and heat dissipation for this bearing.

[0052] The path of the cooling air flow of the magnetic levitation rotating machine of the present invention will be further elaborated below with reference to each figure respectively:

[0053] As Figure 4As shown, an active pure air-cooling system is adopted. The cold air (i.e., the cooling air flow) is provided by the cooling impeller 103 without an additional heat dissipation drive motor. The cooling impeller 103 is assembled at the rear end of the rotor (i.e., the second end of the rotating shaft 100, the same hereinafter). The rear radial bearing (i.e., the aforementioned radial magnetic suspension bearing 104 near the second end of the rotating shaft 100, the same hereinafter) is located between the cooling impeller 103 and the motor stator 105. A front radial bearing (i.e., the aforementioned radial magnetic suspension bearing 104 near the first end of the rotating shaft 100, the same hereinafter) is arranged at the front end. The axial bearing is located between the front radial bearing and the motor stator 105. A guide plate 1032 for guiding the cooling impeller 103 and a rear end cover 1031 are assembled on the rear housing 1042 to increase the air flow conduction and reduce the flow resistance. A plurality of corresponding ventilation holes or ventilation grooves (i.e., the aforementioned exhaust holes 1061) are provided on parts such as the rear housing 1042, the cylinder body (i.e., the aforementioned cylinder body 106, the same hereinafter), and the front housing 1041. The axial bearing is provided with an inner ring hole (i.e., the cooling flow channel) to facilitate the air flow conduction. The cooling gas of the cooling impeller cools the rear radial bearing through the flow channel on the rear housing 1042. The first path: passes through the motor stator flow channel on the cylinder body (i.e., the stator cooling flow channel 1062, the same hereinafter) to cool the motor stator. The second path: passes through the rotor flow channel (not marked in the figure, i.e., the air gap between the motor stator and rotor, the same hereinafter) to cool the motor rotor (coaxial or integral with the rotating shaft 100). Then, it is aggregated at the axial magnetic bearing (i.e., the axial magnetic suspension bearing 101, the same hereinafter) and discharged through the axial stator inner ring hole. Finally, it passes through the front radial bearing → the front housing 1041 → the exhaust hole 1061 and is discharged from the cylinder body. This flow channel structure layout effectively cools the heat-generating components such as the stator, rotor, radial bearing, and axial bearing. At the same time, for the high-heat-generating component, the thrust disk, the heat dissipation air duct formed by the inner ring hole of the axial bearing is used to increase its ventilation and heat dissipation efficiency, realizing the effective ventilation and cooling of the overall heat-generating components of the magnetic levitation rotating machinery. The entire heat dissipation system has a simple structure, an efficient and reliable heat dissipation process, and improves the stability of the magnetic levitation system.

[0054] As Figure 6 shown, in another embodiment, the air-cooling path is consistent with Figure 3 the technical solution shown. The difference is that a cooling water flow channel (i.e., the water cooling flow channel 1063, the same hereinafter) is added at the outer end of the motor stator, mainly aiming at the poor overall internal cooling effect caused by excessive motor power. The addition of the motor water cooling flow channel combined with the overall air-cooling path effectively cools the motor stator, rotor, and magnetic bearing.

[0055] As Figure 7As shown, in another embodiment, an active pure air-cooled heat dissipation system is adopted. The cold air is provided by the cooling impeller without an additional heat dissipation drive motor. The cooling impeller 103 is assembled at the rear end of the rotor. The rear radial bearing is located between the cooling impeller 103 and the motor stator 105, with the front end placed on the front radial bearing. The axial bearing is located between the front radial bearing and the motor stator 105. A deflector 1032 for guiding the flow of the cooling impeller and a rear end cover 1031 are assembled on the rear housing to increase the air flow conduction and reduce the flow resistance. Additionally, several corresponding ventilation holes or ventilation grooves are provided on parts such as the rear housing 1042, the cylinder body, and the front housing 1041. The axial bearing is provided with an inner ring hole to facilitate air flow conduction. The cooling gas of the cooling impeller cools the rear radial bearing through the flow channel. The first path: through the upper flow channel of the cylinder body → the upper flow channel of the front housing 1041 → the front radial bearing and then discharged through the inner ring hole of the axial stator to cool the motor stator, the front radial bearing, and the axial bearing; the second path: discharged through the rotor flow channel to cool the motor rotor. The two paths of gas converge and are discharged from the cylinder body through the exhaust hole 1061. This flow channel structure layout effectively cools the heat-generating components such as the stator, rotor, radial bearings, and axial bearings. At the same time, for the high-heat-generating component, the thrust disk, the heat dissipation air duct formed by the inner ring hole of the axial bearing increases its ventilation and heat dissipation efficiency, realizing the effective ventilation and cooling of all the heat-generating components of the magnetic levitation rotating machinery. The entire heat dissipation system has a simple structure, an efficient and reliable heat dissipation process, and improves the stability of the magnetic levitation system.

[0056] As Figure 8 shown, in another embodiment, an active pure air-cooled heat dissipation system is adopted. The cold air is provided by the centrifugal force generated by the rotation of the rotor without an additional heat dissipation drive motor. The front radial bearing is placed at the front end, and the axial bearing is located between the front radial bearing and the motor stator 105. There is a rotor intake air flow channel (i.e., the aforementioned air intake channel 1001, the same below) inside the rear end of the rotor, which passes through the rotor from the rear to the front and then through several rotor exhaust air flow channels (i.e., radial through-holes) from the inside of the rotor to the outside, located between the motor stator 105 and the axial bearing. Additionally, several corresponding ventilation holes or ventilation grooves are provided on parts such as the cylinder body and the front housing 1041. The axial bearing is provided with an inner ring hole to facilitate air flow conduction. The cooling gas generated by the centrifugal force of the rotor rotation is divided into three paths through the rotor exhaust air flow channels for cooling: the left end passes through the inner ring hole of the axial stator on the axial bearing → the front radial bearing → the exhaust hole 1061 and is discharged; the right end passes through the motor stator flow channel and the motor rotor flow channel and then is discharged through the rear radial bearing. This flow channel structure layout effectively cools the heat-generating components such as the stator, rotor, radial bearings, and axial bearings. At the same time, for the high-heat-generating component, the thrust disk, the heat dissipation air duct formed by the inner ring hole of the axial bearing increases its ventilation and heat dissipation efficiency, realizing the effective ventilation and cooling of all the heat-generating components of the magnetic levitation rotating machinery. The entire heat dissipation system has a simple structure, an efficient and reliable heat dissipation process, and improves the stability of the magnetic levitation system.

[0057] As Figure 5As shown, in another embodiment, an active pure air-cooled heat dissipation system is adopted. The cold air is provided by a cooling impeller and cooperates with two heat dissipation fins to accelerate the air flow out. The cooling impeller 103 is assembled at the rear end of the rotor. The rear radial bearing is located between the cooling impeller 103 and the motor stator 105, and the front end is placed on the front radial bearing. The axial bearing is located between the front radial bearing and the motor stator 105. A deflector 1032 for guiding the cooling impeller and a rear end cover 1031 are assembled on the rear housing to increase the air flow conduction and reduce the flow resistance. Moreover, several corresponding ventilation holes or ventilation grooves are provided on parts such as the rear housing 1042, the cylinder body, and the front housing 1041. The axial bearing is provided with an inner ring hole for facilitating the air flow conduction. The first heat dissipation fin (i.e., the auxiliary heat dissipation air fin 107 at the rear end, the same below) is located between the rear radial bearing and the motor stator and is placed at the inlet of the motor rotor flow channel to facilitate the acceleration of gas inflow. The second heat dissipation fin (i.e., the auxiliary heat dissipation air fin 107 at the front end, the same below) is located between the axial bearing and the motor stator and is placed at the outlet of the motor rotor flow channel to facilitate the acceleration of gas discharge. The cooling gas of the cooling impeller is divided into two paths for cooling. One path passes through the flow channel on the rear housing 1042 and then through the motor stator flow channel on the cylinder body. The second path passes through the flow channel on the rear housing 1042 to cool the rear radial bearing and then is accelerated by the first heat dissipation fin → the motor rotor flow channel → the second heat dissipation fin. After that, it is aggregated at the axial magnetic bearing and discharged in two paths through the inner ring hole of the axial stator and finally passes through the front radial bearing → the front housing 1041 → the exhaust hole 1061 to discharge from the cylinder body. This flow channel structure arrangement, combined with 2 heat dissipation fins, utilizes the rotation of the rotor to accelerate the air flow conduction inside the cylinder body and accelerate the cooling, effectively cooling the heat-generating components such as the motor stator, rotor, radial bearing, and axial bearing. At the same time, for the high-heat-generating component, the thrust disk, the heat dissipation air duct formed by the inner ring hole of the axial bearing is used to increase its ventilation and heat dissipation efficiency, realizing the effective ventilation and cooling of the overall heat-generating components of the magnetic levitation rotating machine. The entire heat dissipation system has a simple structure, and the heat dissipation process is efficient and reliable, improving the stability of the magnetic levitation system.

[0058] It is easy for those skilled in the art to understand that, on the premise of no conflict, the advantageous technical features of the above-mentioned various methods can be freely combined and superimposed.

[0059] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention. The above is only the preferred implementation manner of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and modifications can still be made, and these improvements and modifications should also be regarded as within the protection scope of the present invention.

Claims

1. An axial magnetic bearing, comprising an outer cylinder (1), wherein a first axial stator assembly (2), a second axial stator assembly (3) and a thrust plate (4) are assembled in a central through hole of the outer cylinder (1), wherein the first axial stator assembly (2) comprises a first stator core (21) and a first winding (22) assembled on the first stator core (21), the second axial stator assembly (3) comprises a second stator core (31) and a second winding (32) assembled on the second stator core (31), the thrust plate (4) is located between the magnetic poles of the first stator core (21) and the magnetic poles of the second stator core (31), the magnetic poles of the first stator core (21) comprise a first outer magnetic pole (211) and a first inner magnetic pole (212), and the magnetic poles of the second stator core (31) comprise a second outer magnetic pole (311) and a second inner magnetic pole (312), characterized in that: An outer flow groove (51) is formed on the magnetic end faces of the first outer magnetic pole (211) and the second outer magnetic pole (311), and an inner flow groove (52) is formed on the magnetic end faces of the first inner magnetic pole (212) and the second inner magnetic pole (312), and each of the outer flow grooves (51) and the inner flow grooves (52) extends radially along the thrust plate (4).

2. The axial magnetic bearing according to claim 1, characterized in that: There are a plurality of outer flow grooves (51), which are spaced apart in the circumferential direction of the thrust plate (4); there are a plurality of inner flow grooves (52), which are spaced apart in the circumferential direction of the thrust plate (4).

3. The axial magnetic bearing according to claim 1, characterized in that: The first outer magnetic pole (211) includes a first cover plate portion (2111) extending radially inward along the thrust plate (4), the second outer magnetic pole (311) includes a second cover plate portion (3111) extending radially inward along the thrust plate (4), and the outer flow groove (51) is located on the first cover plate portion (2111) and the second cover plate portion (3111).

4. The axial magnetic bearing according to claim 3, characterized in that: A plane perpendicular to the rotation axis of the thrust disk (4) is a radial plane. In the projection on the radial plane, the radius of the outer circumferential wall of the thrust disk (4) is smaller than the radius of the radial outer groove wall of the outer flow groove (51), and the radius of the radial outer groove wall of the outer flow groove (51) is smaller than the radius of the outer circumferential wall of the first cover plate portion (2111). The outer flow groove (51) penetrates the outer annular wall of the first outer magnetic pole (211) or the second outer magnetic pole (311) along the radial direction of the thrust disk (4); and the inner flow groove (52) penetrates the inner and outer annular walls of the first inner magnetic pole (212) or the second inner magnetic pole (312) along the radial direction of the thrust disk (4).

5. The axial magnetic bearing according to claim 1, characterized in that: The first stator core (21) further comprises a first stator yoke (213) located between the first outer magnetic pole (211) and the first inner magnetic pole (212); the second stator core (31) further comprises a second stator yoke (313) located between the second outer magnetic pole (311) and the second inner magnetic pole (312); the first stator yoke (213) comprises a first outer protruding ring protruding from a radial outer ring wall of the first outer magnetic pole (211); and the second stator yoke (313) comprises a first outer protruding ring protruding from a radial outer ring wall of the second outer magnetic pole (311). ), the first axial stator component (2) is assembled in the outer cylinder (1) via the first outer convex ring, and the second axial stator component (3) is assembled in the outer cylinder (1) via the second outer convex ring to form a cooling cavity between the first outer magnetic pole (211) and the outer cylinder (1) and between the second outer magnetic pole (311) and the outer cylinder (1), and the outer flow groove (51) of the first stator core (21) and the outer flow groove (51) of the second stator core (31) are connected by the cooling cavity.

6. A magnetically suspended rotating machine, comprising a rotating shaft (100) and an axial magnetically suspended bearing (101) for limiting the axial displacement of the rotating shaft (100), characterized in that: The axial magnetic bearing (101) is an axial magnetic bearing according to any one of claims 1 to 5, and the cooling airflow can enter the axial magnetic bearing in sequence through the inner flow groove (52) and the outer flow groove (51) in the stator core on one side, and flow out of the axial magnetic bearing in sequence through the outer flow groove (51) and the inner flow groove (52) in the stator core on the other side.

7. The magnetic levitation rotating machine according to claim 6, characterized in that: The first end of the rotating shaft (100) is connected to the blast turbine, and the second end of the rotating shaft (100) is connected to the cooling impeller (103). The cooling airflow is introduced by the cooling impeller (103) and / or is introduced from the blast turbine.

8. The magnetic levitation rotating machine according to claim 6, characterized in that: The first end of the rotating shaft (100) is connected to a blower turbine, and the rotating shaft (100) has an air inlet passage (1001) extending from its second end surface toward the first end, and the cooling air flow is introduced through the air inlet passage (1001) by centrifugal force during the rotation of the rotating shaft (100).

9. The magnetic levitation rotating machine according to claim 7 or 8, characterized in that: It also includes a cylinder (106), in which a motor stator (105) capable of driving the rotating shaft (100) to rotate is assembled, and a stator cooling channel (1062) is formed in an area of ​​the cylinder (106) corresponding to the position of the motor stator (105).

10. The magnetic levitation rotating machine according to claim 9, characterized in that: A water cooling channel (1063) is also formed in the cylinder (106), and the water cooling channel (1063) is arranged around the outer side of the stator cooling channel (1062).

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