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 a first cooling flow channel penetrating from the inner ring wall of the first inner magnetic pole to the outer ring wall of the first outer magnetic pole is formed in the first stator iron core; the first cooling flow channel flows through a first space between the first winding and the thrust disc, a second cooling flow channel penetrating from the inner ring wall of the second inner magnetic pole to the second outer magnetic pole is formed in the second stator iron core, and the second cooling flow channel flows through a second space between the second winding and 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. These devices have high maintenance costs, complex structural systems, and increased safety hazards. Or, in the form of negative pressure, air is sucked from the blower to guide heat out, but it cannot more effectively achieve the heat dissipation of internal components, especially the heat dissipation of axial magnetic bearings is insufficient, which affects the stable operation of magnetic levitation blowers.

[0003] The axial magnetic bearing realizes the axial movement of the rotating shaft. Therefore, a thrust disk, which is an essential axial force-bearing component on the rotating shaft, is required. 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 heating 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. A first cooling flow channel is constructed in the first stator core, which penetrates from the inner ring wall of the first inner magnetic pole to the outer ring wall of the first outer magnetic pole, and the first cooling flow channel flows through the first space between the first winding and the thrust disk. A second cooling flow channel is constructed in the second stator core, which penetrates from the inner ring wall of the second inner magnetic pole to the outer ring wall of the second outer magnetic pole, and the second cooling flow channel flows through the second space between the second winding and the thrust disk.

[0006] In some embodiments, there are multiple first cooling channels, and the multiple first cooling channels are arranged at intervals in the circumferential direction around the thrust disk. There are multiple second cooling channels, and the multiple second cooling channels are arranged at intervals in the circumferential direction around the thrust disk.

[0007] In some embodiments, the first cooling channel includes a first inner through-hole penetrating the inner and outer ring walls of the first inner magnetic pole and a first outer through-hole penetrating the inner and outer ring walls of the first outer magnetic pole; the second cooling channel includes a second inner through-hole penetrating the inner and outer ring walls of the second inner magnetic pole and a second outer through-hole penetrating the inner and outer ring walls of the second outer magnetic pole.

[0008] In some embodiments, the first outer magnetic pole includes a first cover plate portion extending radially inward along the thrust disk, and the first outer through-hole is not located on the first cover plate portion. The second outer magnetic pole includes a second cover plate portion extending radially inward along the thrust disk, and the second outer through-hole is not located on the second cover plate portion.

[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 radial outer ring wall of the first outer magnetic pole, and the second stator yoke portion has a second outer convex ring protruding from the radial 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 first cooling channel and the second cooling channel 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 defining the axial displacement of the rotating shaft. The axial magnetic levitation bearing is the above-mentioned axial magnetic levitation bearing. Cooling air can enter the axial magnetic levitation bearing through one of the first cooling channel and the second cooling channel and flow out of the axial magnetic levitation bearing through the other of the first cooling channel and the second cooling channel.

[0011] In some embodiments, the first end of the rotating shaft is connected to a blower turbine, and the second end of the rotating shaft is connected to a cooling impeller. The cooling air 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 intake passage extends from the end face of the second end of the rotating shaft towards the first end within the rotating shaft. The cooling air flow is introduced into the air intake passage 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 within the cylinder body. A stator cooling flow passage is formed in a region of the cylinder body corresponding to the electric motor stator.

[0014] In some embodiments, a water cooling flow passage is further formed within the cylinder body. The water cooling flow passage is disposed around the outer side of the stator cooling flow passage.

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

[0016] A first cooling flow passage and a second cooling flow passage that penetrate radially inward and outward respectively are provided within the first axial stator assembly and the second axial stator assembly, thereby guiding the cooling air flow outside the bearing to the inside of the bearing and enabling it to enter the aforementioned first space and second space. In this way, efficient cooling of the windings, stator core, and thrust disk within the bearing is achieved. Due to the construction of the cooling flow passages, the air gap width between the stator core magnetic poles and the thrust disk can be designed to be smaller, without the need to maintain a larger air gap width as in the prior art to ensure that the cooling air flow enters through the air gap for cooling or to form a flow-through structure on the end faces of the magnetic poles / thrust disk. At the same time, less cooling air flow enters the air gap, which can ensure reliable axial force output of 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 It is a schematic internal structure diagram (half-section) of an axial magnetic levitation bearing according to an embodiment of the present utility model. The cooling air flow passes through the inside of the axial magnetic levitation bearing from right to left;

[0019] Figure 2 It is a schematic internal structure diagram (half-section) of an axial magnetic levitation bearing according to an embodiment of the present utility model. The cooling air flow passes through the inside of the axial magnetic levitation bearing from left to right;

[0020] Figure 3It is a schematic diagram of the internal structure of the 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;

[0021] Figure 4 It is a schematic diagram of the internal structure of the second 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 third 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;

[0023] Figure 6 It is a schematic diagram of the internal structure of the fourth 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;

[0024] Figure 7 It is a schematic diagram of the internal structure of the fifth 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.

[0025] The reference numerals are as follows:

[0026] 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; 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; 32. Second winding; 4. Thrust disc; 51. First inner through hole; 52. First outer through hole; 53. Second inner through hole; 54. Second outer through hole; 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

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part rather than all of the embodiments of the present utility model. The description of at least one exemplary embodiment below is actually only illustrative and in no way restricts 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.

[0028] In the description of the present utility model, it should be understood that the orientation or positional relationships indicated by orientation words such as "front, rear, upper, lower, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the orientation or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present utility model and simplifying the description. Without contrary explanations, these orientation words do not indicate and imply that the devices or elements referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting 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.

[0029] 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 relationships of a device or feature shown in the drawings with 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 orientations 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 corresponding interpretations should be made for the spatial relative descriptions used here.

[0030] In addition, it should be noted that the use of words such as "first", "second" etc. to limit components is only for the convenience of differentiating the corresponding components. Without otherwise stating, the above words have no special meanings. Therefore, they should not be construed as limiting the protection scope of the present utility model.

[0031] See in conjunction with Figures 1 to 7As shown, according to an embodiment of the present invention, an axial magnetic levitation bearing is provided, including 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 disk 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 disk 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 formed between the thrust disk 4 and the first stator core 21 and between the thrust disk 4 and the second stator core 31 respectively. The magnetic poles of the first stator core 21 include a first outer magnetic pole 211 and a first inner magnetic pole 212. The magnetic poles of the second stator core 31 include a second outer magnetic pole 311 and a second inner magnetic pole 312. A first cooling flow channel (not labeled in the figure) is constructed in the first stator core 21, which penetrates from the inner ring wall of the first inner magnetic pole 212 to the outer ring wall of the first outer magnetic pole 211, and the first cooling flow channel flows through a first space (not labeled in the figure) between the first winding 22 and the thrust disk 4. A second cooling flow channel (not labeled in the figure) is constructed in the second stator core 31, which penetrates from the inner ring wall of the second inner magnetic pole 312 to the outer ring wall of the second outer magnetic pole 311, and the second cooling flow channel flows through a second space (not labeled in the figure) between the second winding 32 and the thrust disk 4.

[0032] In this technical solution, a first cooling flow channel and a second cooling flow channel that penetrate radially inside and outside are respectively arranged 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 interior and be able to enter the aforementioned first space and second space, thus realizing efficient cooling of the windings, stator cores, and thrust disks inside the bearing. Due to the construction of the cooling flow channels, the air gap width between the stator core magnetic poles and the thrust disk 4 can be designed to be smaller, without the need to maintain a larger air gap width as in the prior art to ensure that the cooling air flow enters through the air gap for cooling or form a flow-through structure on the magnetic pole / thrust disk end faces. At the same time, less cooling air flow enters the air gap, which can ensure the reliable axial output force of the bearing.

[0033] It can be understood that the cooling air flow in this technical solution realizes entry and exit depending on the pressure difference at both axial ends of the bearing.

[0034] In some embodiments, there are multiple first cooling flow channels, and the multiple first cooling flow channels are arranged at intervals in the circumferential direction around the thrust disk 4. There are multiple second cooling flow channels, and the multiple second cooling flow channels are arranged at intervals in the circumferential direction around the thrust disk 4.

[0035] In this technical solution, by circumferentially arranging multiple cooling channels, uniform cooling and heat dissipation inside the axial magnetic bearing can be achieved.

[0036] In a specific embodiment, the first cooling channel includes a first inner through-hole 51 that penetrates the inner and outer ring walls (i.e., the inner ring wall and the outer ring wall) of the first inner magnetic pole 212, and a first outer through-hole 52 that penetrates the inner and outer ring walls of the first outer magnetic pole 211; the second cooling channel includes a second inner through-hole 53 that penetrates the inner and outer ring walls of the second inner magnetic pole 312, and a second outer through-hole 54 that penetrates the inner and outer ring walls of the second outer magnetic pole 311.

[0037] In this technical solution, the through-holes that radially penetrate the corresponding magnetic pole ring walls are used to realize the penetration of the cooling channels inside and outside the bearing, and the structure is simple. It should be noted that in order to reduce the adverse effects of the opening of each through-hole on the magnetic field lines, each through-hole should be arranged in the area with a relatively small magnetic density of the stator core magnetic pole. The aforementioned area with a relatively small magnetic density can be obtained through corresponding simulation methods. The size of the corresponding through-hole diameter is reasonably selected according to the actual cooling requirements, so as to ensure that the inflow and outflow cooling air volume is sufficient.

[0038] In some embodiments, the first outer magnetic pole 211 includes a first cover plate portion 2111 that extends radially inward along the thrust disk 4, and the first outer through-hole 52 is not located on the first cover plate portion 2111. The second outer magnetic pole 311 includes a second cover plate portion 3111 that extends radially inward along the thrust disk 4, and the second outer through-hole 54 is not located on the second cover plate portion 3111.

[0039] The aforementioned first cover plate portion 2111 and second cover plate portion 3111 are specifically both annular plates. As a part of the stator core, they are used to conduct the magnetic circuit formed by the corresponding windings. Since they extend radially inward 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.

[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 radial outer 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 radial outer 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 first cooling flow channel and the second cooling flow channel are communicated by the cooling cavity.

[0041] In this technical solution, by providing an outer convex ring radially outward along the stator yoke portion, a corresponding cooling cavity is formed between the stator core and the outer cylinder 1. At the same time, the winding cooling flow channels in the two axial stator assemblies on both sides are communicated with the cooling cavity, so that more efficient and sufficient cooling of the stator core can be achieved, 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 3 to 7 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 enter the axial magnetic levitation bearing through one of the first cooling flow channel and the second cooling flow channel and flow out of the axial magnetic levitation bearing through the other of the first cooling flow channel and the second cooling flow channel. It can be understood that specifically which of the first cooling flow channel and the second cooling flow channel the cooling air flow flows into and which it flows out of 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 3 to 6As shown, in some embodiments, the first end of the rotating shaft 100 is connected to a blower turbine (not shown in the figure), the second end of the rotating shaft 100 is connected to a cooling impeller 103, and the cooling air flow is introduced 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 operates, the rotation of the cooling impeller 103 can be synchronously achieved, thereby introducing external air into the magnetic levitation rotating machine. That is, the direct drive of the cooling impeller 103 by the rotating shaft 100 is realized, without the need to separately configure a corresponding cooling structure for the cooling of the bearings, and without the need to separately set a dedicated controller for the cooling impeller 103. The control logic is simple and the heat dissipation reliability is high.

[0044] Figures 3 to 6 The situation of cooling only the components in the magnetic levitation rotating machine by the cooling air flow driven by the cooling impeller 103 is shown. 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 the figures, the cooling impeller 103 rotates to drive the external air flow along the guide plate 1032 into the cylinder 106.

[0045] In a preferred embodiment, the cooling air flow is provided by the simultaneous action of the cooling impeller 103 and the blower turbine. In this way, the introduction of the cooling air flow from both axial ends of the magnetic levitation rotating machine can be achieved, so as to ensure the comprehensive cooling of the components in 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 hole 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 7 As shown, in another embodiment, the first end of the rotating shaft 100 is connected to a blower turbine, and the rotating shaft 100 has an air guiding channel 1001 extending from the end face of its second end towards the first end. The cooling air flow is introduced by the rotating shaft 100 relying on centrifugal force via the air guiding channel 1001 during rotation. Specifically, a corresponding air guiding structure is provided in the air guiding channel 1001 of the rotating shaft 100. When the rotating shaft 100 rotates at a high speed, the external air is introduced axially inward along the rotating shaft 100 under the action of the air guiding structure 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 realize the cooling of the components in the magnetic levitation rotating machine.

[0047] Further refer to Figure 7As shown, the radial through-hole of the air intake passage 1001 is located between the axial magnetic suspension bearing 101 and the motor stator 105, and 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 all relevant components in the axial direction of the rotating shaft 100.

[0048] Specifically refer to Figure 3 and Figure 4 As shown, in some embodiments, the magnetic suspension rotating machine further includes a cylinder 106. An electric 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 area corresponding to the cylinder 106 and the electric motor stator 105. At this time, the cooling air flow driven by the cooling impeller 103 can flow through the air gap between the stator and rotor of the electric motor and the stator cooling flow channel 1062, so as to be able to cool and dissipate heat from both the inside and outside of the electric motor stator 105.

[0049] Specifically refer to Figure 5 As shown, on the basis of the structure of the magnetic suspension rotating machine shown in Figure 4 a water cooling flow channel 1063 is further formed inside the cylinder 106. The water cooling flow channel 1063 is arranged around the outside of the stator cooling flow channel 1062. It can be understood that the water cooling flow channel 1063 forms a circulation design with an external water cooling source. Through the water cooling flow channel 1063, the cooling air flow flowing through the stator cooling flow channel 1062 can be cooled, improving the overall cooling effect of the magnetic suspension rotating machine.

[0050] Specifically refer to Figure 4 As shown, corresponding heat dissipation holes (not marked in the figure) are formed on the rear housing corresponding to the radial magnetic suspension bearing 104 (i.e., the rear end radial magnetic suspension bearing) near the second end position 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 suspension 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. The two auxiliary heat dissipation fan blades 107 are respectively arranged on the rotating shaft 100 corresponding to both ends of the electric motor stator 105, so as to further improve the heat dissipation effect and heat dissipation efficiency of the magnetic suspension rotating machine.

[0051] The path of the cooling air flow of the magnetic suspension rotating machine of the present invention will be further described below with reference to each figure:

[0052] As Figure 3As shown in the figure, an active pure air-cooled heat dissipation 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 levitation 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. The front radial bearing (i.e., the aforementioned radial magnetic levitation 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 opened 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: it cools the motor stator through the motor stator flow channel on the cylinder body (i.e., the stator cooling flow channel 1062, the same hereinafter). The second path: it cools the motor rotor (coaxial or integral with the rotating shaft 100) through the rotor flow channel (not marked in the figure, i.e., the air gap between the motor stator and rotor, the same hereinafter). Then, it is aggregated at the axial magnetic bearing (i.e., the axial magnetic levitation 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 arrangement effectively cools the heating components such as the stator, rotor, radial bearing, and axial bearing. At the same time, for the high-heating component 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 heating 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.

[0053] As Figure 5 shown, in another embodiment, the air-cooled path is consistent with Figure 3 the technical solution shown in the figure. 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. This is mainly aimed at the poor overall internal cooling effect caused by excessive motor power. By adding the motor water cooling flow channel and combining it with the overall air-cooled path, the motor stator and rotor and the magnetic bearing can be effectively cooled.

[0054] As Figure 6As shown, in another embodiment, an active pure air-cooled heat dissipation system is adopted. The cold air is provided by a 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. A plurality of 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 the 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 are collected and discharged from the cylinder body through the exhaust hole 1061. With this flow channel structure arrangement, it 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 the overall heat-generating components of the magnetic levitation rotating machinery. 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.

[0055] As Figure 7 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, passing 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. A plurality of 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 the air flow conduction. The cooling gas generated by the centrifugal force of the rotor rotation is divided into three paths for cooling through the rotor exhaust air flow channels: 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. With this flow channel structure arrangement, it 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 the overall heat-generating components of the magnetic levitation rotating machinery. 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.

[0056] As Figure 4As shown, in another embodiment, an active pure air-cooling heat dissipation system is adopted, and the cold air is provided by the cooling impeller and cooperated with two heat dissipation blades to accelerate the airflow discharge, the cooling impeller 103 is installed at the rear end of the rotor, the rear radial bearing is located between the cooling impeller 103 and the motor stator 105, the front end is placed in the front radial bearing, and the axial bearing is located between the front radial bearing and the motor stator 105. The rear shell is equipped with a guide plate 1032 and a rear end cover 1031 for cooling impeller diversion to increase airflow conduction and reduce flow resistance, and the rear shell 1042, the cylinder, the front shell 1041 and other parts are provided with a number of corresponding ventilation holes or ventilation grooves, and the axial bearing is provided with an inner ring hole for airflow conduction. The heat dissipation blade 1 (that is, the auxiliary heat dissipation blade 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 accelerate the inflow of gas, and the heat dissipation blade 2 (that is, the auxiliary heat dissipation blade 107 at the front end, the same below) is located between the axial bearing and the motor stator and is placed on the motor rotor The outlet of the flow channel is convenient for accelerating gas discharge. The cooling gas of the cooling impeller is divided into two cooling paths. One path passes through the flow channel on the rear shell 1042 and then passes through the motor stator flow channel on the cylinder. The second path passes through the flow channel on the rear shell 1042 to cool the rear radial bearing and then passes through the heat dissipation blade one to accelerate the airflow → motor rotor flow channel → heat dissipation blade two. Then it is summarized at the axial magnetic bearing and divided into two paths to be discharged through the axial stator inner ring hole and finally pass through the front radial bearing → front shell 1041 → exhaust hole 1061 to discharge from the cylinder. This flow channel structure arrangement, in conjunction with two heat dissipation blades, utilizes the rotor rotation to accelerate the air flow conduction inside the cylinder, accelerates cooling, and effectively cools 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 thrust plate, the heat dissipation duct formed by the inner ring hole of the axial bearing is utilized to increase its ventilation and heat dissipation efficiency, thereby realizing 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, and the heat dissipation process is efficient and reliable, thereby improving the stability of the magnetic levitation system.

[0057] It is easy for those skilled in the art to understand that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0058] The above is only a preferred embodiment of the utility model, and is not intended to limit the utility model. Any modifications, equivalent replacements and improvements made within the spirit and principles of the utility model should be included in the protection scope of the utility model. The above is only a preferred implementation of the utility model. 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 utility model, and these improvements and variations should also be regarded as the protection scope of the utility model.

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: The first stator core (21) is provided with a first cooling channel extending from the inner ring wall of the first inner magnetic pole (212) to the outer ring wall of the first outer magnetic pole (211), and the first cooling channel flows through a first space between the first winding (22) and the thrust plate (4); the second stator core (31) is provided with a second cooling channel extending from the inner ring wall of the second inner magnetic pole (312) to the second outer magnetic pole (311), and the second cooling channel flows through a second space between the second winding (32) and the thrust plate (4).

2. The axial magnetic bearing according to claim 1, characterized in that: There are a plurality of first cooling channels, which are arranged at intervals in the circumferential direction of the thrust plate (4); there are a plurality of second cooling channels, which are arranged at intervals in the circumferential direction of the thrust plate (4).

3. The axial magnetic bearing according to claim 1, characterized in that: The first cooling channel comprises a first inner through hole (51) penetrating the inner and outer ring walls of the first inner magnetic pole (212) and a first outer through hole (52) penetrating the inner and outer ring walls of the first outer magnetic pole (211); the second cooling channel comprises a second inner through hole (53) penetrating the inner and outer ring walls of the second inner magnetic pole (312) and a second outer through hole (54) penetrating the inner and outer ring walls of the second outer magnetic pole (311).

4. The axial magnetic bearing according to claim 3, characterized in that: The first outer magnetic pole (211) includes a first cover plate portion (2111) extending radially inward along the thrust plate (4), and the first outer through hole (52) is not located on the first cover plate portion (2111); the second outer magnetic pole (311) includes a second cover plate portion (3111) extending radially inward along the thrust plate (4), and the second outer through hole (54) is not located on the second cover plate portion (3111).

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 convex 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 convex ring protruding from a radial outer ring wall of the first outer magnetic pole (211); A second outer convex ring protrudes from the 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 first cooling channel and the second cooling channel 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 the axial magnetic bearing according to any one of claims 1 to 5, and the cooling air flow can enter the axial magnetic bearing through one of the first cooling channel and the second cooling channel and flow out of the axial magnetic bearing through the other of the first cooling channel and the second cooling channel.

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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