Magnetic suspension rotating machine

Abstract

The invention provides a magnetic suspension rotating machine which comprises a rotating shaft and an axial magnetic suspension bearing, the bearing comprises 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, the second axial stator assembly comprises a second stator iron core, the thrust disc is located between magnetic poles of the two stator iron cores, and the thrust disc is located between magnetic poles of the two stator iron cores. The magnetic poles of the first stator core comprise a first outer magnetic pole and a first inner magnetic pole, the magnetic poles of the second stator core comprise a second outer magnetic pole and a second inner magnetic pole, outer overcurrent grooves are formed in the magnetic pole end faces of the first outer magnetic pole and the second outer magnetic pole, and inner overcurrent grooves are formed in the magnetic pole end faces of the first inner magnetic pole and the second inner magnetic pole. Cooling airflow can enter the bearing through the inner overflowing groove and the outer overflowing groove in one side in sequence and flow out through the outer overflowing groove and the inner overflowing groove in the other side in sequence. A corresponding cooling structure does not need to be independently configured for cooling the bearing, and the internal structure of the bearing can be effectively cooled.

Description

Technical Field

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

[0002] At present, the heat dissipation of magnetic levitation blowers is mainly achieved through external cooling equipment, such as external cooling fans, water cooling systems, and heat exchangers. The equipment has high maintenance costs, complex structural systems, and increased safety hazards. Alternatively, the heat is drawn out from the blower in the form of negative pressure, which cannot dissipate the heat of internal components more effectively. In particular, the heat dissipation of the axial magnetic bearings is not sufficient, affecting the stable operation of the magnetic levitation blower.

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

[0004] Therefore, the present invention provides a magnetic levitation rotary machine, which can solve the technical problems of serious heating and low heat dissipation efficiency of the axial magnetic bearing in the magnetic levitation rotary machine in the prior art.

[0005] In order to solve the above problems, the present invention provides a magnetic levitation rotating machinery, including a rotating shaft and an axial magnetic levitation bearing for limiting the axial displacement of the rotating shaft, the axial magnetic levitation bearing including an outer cylinder, a first axial stator assembly, a second axial stator assembly and a thrust plate are assembled in a 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 plate is located between the magnetic poles of the first stator core and the magnetic poles of the second stator core, and the 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 end faces of the first outer magnetic pole and the second outer magnetic pole, inner flow grooves are formed on the magnetic end faces of the first inner magnetic pole and the second inner magnetic pole, and each of the outer flow grooves and the inner flow grooves extends radially along the thrust plate; the cooling air flow can enter the axial magnetic bearing in turn through the inner flow grooves and the outer flow grooves in the stator core on one side and flow out of the axial magnetic bearing in turn through the outer flow grooves and the inner flow grooves in the stator core on the other side.

[0006] 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 airflow is introduced by the cooling impeller and / or is introduced from the blower turbine.

[0007] In some embodiments, the first end of the rotating shaft is connected to a blower turbine, and the rotating shaft has an air bleed passage extending from its second end surface toward the first end, and the cooling air flow is introduced through the air bleed passage by relying on centrifugal force during the rotation of the rotating shaft.

[0008] In some embodiments, the magnetic levitation rotating machine further includes a cylinder, in which a motor stator capable of driving the rotating shaft to rotate is assembled, and a stator cooling channel is formed in an area of ​​the cylinder corresponding to the position of the motor stator.

[0009] In some embodiments, a water cooling channel is further formed in the cylinder, and the water cooling channel is arranged around the outer side of the stator cooling channel.

[0010] In some embodiments, the rotating shaft is further provided with auxiliary heat dissipation blades, and two of the auxiliary heat dissipation blades are respectively located at two ends of the motor stator.

[0011] In some embodiments, a radial magnetic bearing is also mounted on the rotating shaft between the motor stator and the cooling impeller, and the cooling airflow introduced by the cooling impeller enters the radial magnetic bearing and then flows out under the drive of the auxiliary heat dissipation blades.

[0012] In some embodiments, the first outer magnetic pole includes a first cover plate portion extending radially inward along the thrust plate, the second outer magnetic pole includes a second cover plate portion extending radially inward along the thrust plate, and the outer flow groove is located on the first cover plate portion and the second cover plate portion.

[0013] In some embodiments, a plane perpendicular to the rotating axis of the thrust plate is a radial plane, and in the projection on the radial plane, the radius of the outer circumferential wall of the thrust plate is smaller than the radius of the radial outer groove wall of the outer flow groove, and the radius of the radial outer groove wall of the outer flow groove is smaller than the radius of the outer circumferential wall of the first cover plate portion, and the outer flow groove penetrates the outer annular wall of the first outer magnetic pole or the second outer magnetic pole along the radial direction of the thrust plate; the inner flow groove penetrates the inner and outer annular walls of the first inner magnetic pole or the second inner magnetic pole along the radial direction of the thrust plate.

[0014] In some embodiments, the first stator core also includes a first stator yoke portion located between the first outer magnetic pole and the first inner magnetic pole, and the second stator core also includes a second stator yoke portion located 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 annular wall of the first outer magnetic pole, and the second stator yoke portion has a second outer convex ring protruding from the radial outer annular wall of the second outer magnetic pole, the first axial stator assembly is assembled in the outer cylinder via the first outer convex ring and the second axial stator assembly is assembled in 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, and the outer flow groove of the first stator core and the outer flow groove of the second stator core are connected by the cooling cavity.

[0015] The magnetic levitation rotating machine provided by the present invention has the following beneficial effects:

[0016] Since the cooling impeller and the blower turbine share a common rotating shaft, the cooling impeller can rotate synchronously when the magnetic levitation rotating machinery is running, and then the external air can be introduced into the magnetic levitation rotating machinery, that is, the cooling impeller is directly driven by the rotating shaft. There is no need to separately configure a corresponding cooling structure for cooling the bearing, and there is no need to set up a special controller for the cooling impeller. The control logic is simple, the heat dissipation reliability is high, and the product cost can be reduced to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. The drawings described below are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0018] Figure 1 1 is a schematic diagram of the internal structure of an axial magnetic bearing according to an embodiment of the present invention (half-section), wherein a cooling airflow passes through the interior of the axial magnetic bearing from right to left;

[0019] Figure 2 yes Figure 1 Cross-section of the middle AA;

[0020] Figure 3 1 is a schematic diagram of the internal structure of an axial magnetic bearing according to an embodiment of the present invention (three-dimensional half-section), wherein the cooling airflow passes through the interior of the axial magnetic bearing from right to left;

[0021] Figure 4 1 is a schematic diagram of the internal structure of the first embodiment of the magnetic levitation rotary machine of the present invention, wherein the arrows in the figure indicate the flow path of the cooling air flow;

[0022] Figure 5 1 is a schematic diagram of the internal structure of the second embodiment of the magnetic levitation rotary machine of the present invention, wherein the arrows in the figure indicate the flow path of the cooling air flow;

[0023] Figure 6 1 is a schematic diagram of the internal structure of the third embodiment of the magnetic levitation rotary machine of the present invention, wherein the arrows in the figure indicate the flow path of the cooling air flow;

[0024] Figure 7 1 is a schematic diagram of the internal structure of the fourth embodiment of the magnetic levitation rotary machine of the present invention, wherein the arrows in the figure indicate the flow path of the cooling air flow;

[0025] Figure 8 1 is a schematic diagram of the internal structure of the fifth embodiment of the magnetic levitation rotary machine of the present invention, and the arrows in the figure indicate the flow path of the cooling airflow.

[0026] The accompanying drawings are marked as follows:

[0027] 1. outer cylinder; 2. first axial stator assembly; 21. first stator core; 211. first outer magnetic pole; 2111. first cover plate; 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 plate; 312. second inner magnetic pole; 313. second stator yoke; 32. second winding; 4. thrust plate; 51. outer current groove; 52. Inner flow groove; 100. Rotating shaft; 1001. Air duct; 101. Axial magnetic bearing; 1022. Front cover; 103. Cooling impeller; 1031. Rear cover; 1032. Guide plate; 104. Radial magnetic bearing; 1041. Front housing; 1042. Rear housing; 105. Motor stator; 106. Cylinder; 1061. Exhaust hole; 1062. Stator cooling channel; 1063. Water cooling channel; 107. Auxiliary heat dissipation fan blades. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

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

[0031] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0032] See also Figures 1 to 8As shown, according to an embodiment of the present invention, an axial magnetic bearing is provided, comprising an outer cylinder 1 (in some cases, the outer cylinder 1 may be, for example, a cylinder body 106 described later), 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, wherein the second axial stator assembly 3 comprises a second stator core 31 and a second winding 32 assembled on the second stator core 31, wherein 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. Corresponding air gaps are formed between the poles, and between the thrust plate 4 and the first stator core 21 and between the thrust plate 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, 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 flow grooves 51 are formed on the magnetic end faces of the first outer magnetic pole 211 and the second outer magnetic pole 311, and inner flow grooves 52 are formed on the magnetic end faces of the first inner magnetic pole 212 and the second inner magnetic pole 312. Each of the outer flow grooves 51 and the inner flow grooves 52 extends radially along the thrust plate 4.

[0033] In this technical solution, an outer flow groove 51 and an inner flow groove 52 extending inward and outward in their respective radial directions 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 to the inside of the bearing and flow out, and the amount of cooling air entering the bearing is increased, thereby achieving efficient heat dissipation and cooling of the windings, stator core and thrust plate in the bearing.

[0034] It can be understood that the cooling airflow in this technical solution is realized by the pressure difference between the two axial ends of the bearing.

[0035] In some embodiments, there are multiple outer flow grooves 51, and the multiple outer flow grooves 51 are spaced apart in the circumferential direction of the thrust plate 4, and there are multiple inner flow grooves 52, and the multiple inner flow grooves 52 are spaced apart in the circumferential direction of the thrust plate 4.

[0036] In this technical solution, by arranging a plurality of cooling flow channel flow grooves circumferentially, uniform cooling and heat dissipation inside the axial magnetic suspension bearing can be achieved.

[0037] In some embodiments, 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.

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

[0039] In some embodiments, the plane perpendicular to the rotating axis of the thrust plate 4 is a radial plane. In the projection on the radial plane, the radius of the outer circumferential wall of the thrust plate 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 plate 4, that is, the outer flow groove 51 does not penetrate the inner and outer annular walls of the corresponding cover plate portion, so that the flow gap between the magnetic pole end face and the thrust plate 4 is increased, the inflow and outflow of the cooling airflow is increased, and at the same time, the adverse effect of the groove on the magnetic lines of force is minimized; 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 plate 4 to ensure the inflow and outflow of the cooling airflow in the gap between the inner magnetic pole and the thrust plate 4.

[0040] In some embodiments, the first stator core 21 further includes a first stator yoke 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 313 between the second outer magnetic pole 311 and the second inner magnetic pole 312, wherein the first stator yoke 213 has a first outer protruding ring (not marked in the figure) protruding from the radial outer ring wall of the first outer magnetic pole 211, and the second stator yoke 313 has a first outer protruding ring (not marked in the figure) protruding from the radial outer ring wall of the second outer magnetic pole 3 11, the first axial stator assembly 2 is assembled in the outer cylinder 1 via the first outer convex ring, and the second axial stator assembly 3 is assembled in 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, 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.

[0041] In this technical solution, an outer 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 flow grooves 51 in the axial stator assemblies on both sides are connected to the cooling cavity, so that the stator core can be cooled more efficiently and fully, further preventing the bearing from overheating.

[0042] According to an embodiment of the present invention, in combination with Figures 4 to 8 As shown, a magnetic levitation rotating machine is also provided, such as a blower, an air compressor, etc., including a rotating shaft 100 and an axial magnetic levitation bearing 101 for limiting the axial displacement of the rotating shaft 100, the axial magnetic levitation bearing 101 is the above-mentioned axial magnetic levitation bearing, and the cooling air flow can enter the axial magnetic levitation 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 levitation bearing in sequence through the outer flow groove 51 and the inner flow groove 52 in the stator core on the other side. It can be understood that the specific side from which the cooling air flow flows in and 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] See also Figures 4 to 7 As shown, in some embodiments, the first end of the rotating shaft 100 is connected to the blower turbine (not shown in the figure), 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 drawn from the blower turbine. Since the cooling impeller 103 and the blower turbine share the rotating shaft 100, when the magnetic levitation rotating machinery is running, the rotation of the cooling impeller 103 can be synchronously realized, and then the external air is introduced into the magnetic levitation rotating machinery, that is, the cooling impeller 103 is directly driven by the rotating shaft 100, and there is no need to separately configure a corresponding cooling structure for cooling the bearing, and there is no need to set a special controller for the cooling impeller 103. The control logic is simple and the heat dissipation reliability is high.

[0044] Figures 4 to 7 The figure shows the situation that each component in the magnetic levitation rotating machine is cooled only by the cooling airflow driven by the cooling impeller 103. The arrows in each figure indicate the flow path of the cooling airflow, and the aforementioned flow path is different depending on the setting position of the exhaust hole 1061. Figures 3 to 6 In the embodiments shown in the figures, the cooling impeller 103 rotates to drive the external airflow into the cylinder 106 along the guide plate 1032 .

[0045] In a preferred embodiment, the cooling airflow is provided by the cooling impeller 103 and the blower turbine simultaneously, so that the cooling airflow can be introduced from both axial ends of the magnetic levitation rotating machinery, thereby ensuring comprehensive cooling of various components in the magnetic levitation rotating machinery, such as the aforementioned axial magnetic levitation bearing 101, radial magnetic levitation bearing 104, and motor stator 105. Under this structural type, the exhaust hole 1061 is preferably arranged in the axial center area of ​​the cylinder 106, specifically in the area between the axial magnetic levitation bearing 101 and the motor stator 105.

[0046] See Figure 8 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 inlet channel 1001 extending from its second end face toward the first end, and the cooling air flow is introduced through the air inlet channel 1001 by relying on centrifugal force during the rotation of the rotating shaft 100. Specifically, a corresponding air inlet structure is arranged in the air inlet channel 1001 of the rotating shaft 100. When the rotating shaft 100 rotates at a high speed, the external air is introduced inward along the axial direction of the rotating shaft 100 under the action of the air inlet structure in the air inlet channel 1001, and flows out from the radial through holes (not marked in the figure) on the rotating shaft 100 and is sent to the interior of the magnetic levitation rotating machinery, thereby realizing cooling of various components in the magnetic levitation rotating machinery.

[0047] See also Figure 8 As shown, the radial through hole of the air duct 1001 is located between the axial magnetic bearing 101 and the motor stator 105, and the exhaust holes 1061 are respectively arranged at the front end and the rear end of the cylinder 106, thereby ensuring comprehensive and efficient cooling of the axial related components of the rotating shaft 100.

[0048] See Figure 4 and Figure 5 As shown, in some embodiments, the magnetic levitation rotating machinery 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 the area corresponding to the position of the cylinder 106 and the motor stator 105. 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 channel 1062, so that the inside and outside of the motor stator 105 can be cooled and dissipated simultaneously.

[0049] See Figure 6 As shown, in Figure 5Based on the structure of the magnetic levitation rotating machinery shown, 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. It can be understood that the water cooling channel 1063 and the external water cooling source form a circulation design. The cooling airflow flowing through the stator cooling channel 1062 can be cooled by the water cooling channel 1063, thereby improving the cooling effect of the entire magnetic levitation rotating machinery.

[0050] See Figure 5 As shown, a corresponding heat dissipation hole (not marked in the figure) is formed on the rear housing corresponding to the radial magnetic bearing 104 (i.e., the rear radial magnetic bearing) at the second end position close to the rotating shaft 100, so that a part of the cooling airflow driven by the cooling impeller 103 can be guided to the rear radial magnetic bearing to achieve cooling and heat dissipation of the bearing. Figure 4 As shown, the shaft 100 is also provided with auxiliary heat dissipation blades 107, specifically two of which are arranged respectively on the shaft 100 corresponding to the two ends of the motor stator 105, thereby further improving the heat dissipation effect and efficiency of the magnetic levitation rotating machinery.

[0051] See Figure 5 As shown, a radial magnetic bearing 104 is also mounted on the rotating shaft 100 between the motor stator 105 and the cooling impeller 103. The cooling airflow introduced by the cooling impeller 103 enters the radial magnetic bearing 104 and then flows out under the drive of the auxiliary heat dissipation blades 107. Thus, a part of the cooling airflow introduced by the cooling impeller 103 into the magnetically suspended rotating machinery can be introduced into the interior of the radial magnetic bearing 104 under the action of the auxiliary heat dissipation blades 107, thereby forming efficient cooling and heat dissipation for the bearing.

[0052] The cooling airflow path of the magnetic levitation rotating machine of the present invention is further described below in conjunction with the respective figures:

[0053] like Figure 4As shown, an active pure air cooling heat dissipation system is adopted, and the cold air (i.e., the cooling airflow) is provided by the cooling impeller 103, and no additional heat dissipation drive motor is required. 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 below), and the rear radial bearing (i.e., the aforementioned radial magnetic suspension bearing 104 near the second end of the rotating shaft 100, the same below) is located between the cooling impeller 103 and the motor stator 105, and the front radial bearing (i.e., the aforementioned radial magnetic suspension bearing 104 near the first end of the rotating shaft 100, the same below) is arranged at the front end. The magnetic suspension bearing 104, the same below), the axial bearing is located between the front radial bearing and the motor stator 105, the rear housing 1042 is equipped with a guide plate 1032 and a rear end cover 1031 for guiding the cooling impeller 103 to increase air flow conduction and reduce flow resistance, and the rear housing 1042, the cylinder (that is, the aforementioned cylinder 106, the same below), the front housing 1041 and other parts are provided with a number of corresponding ventilation holes or ventilation slots (that is, the aforementioned exhaust holes 1061), and the axial bearing is provided with an inner ring hole (that is, the cooling The cooling gas of the cooling impeller cools the rear radial bearing through the flow channel on the rear housing 1042. The first path: cools the motor stator through the motor stator flow channel on the cylinder (that is, the stator cooling flow channel 1062, the same below). The second path: cools the motor rotor (coaxial with or integrated with the rotating shaft 100) through the rotor flow channel (not marked in the figure, that is, the motor stator and rotor air gap, the same below). Then, it is collected at the axial magnetic bearing (that is, the axial magnetic suspension bearing 101, the same below) and discharged through the axial stator inner ring hole. Finally, it is discharged from the cylinder through the front radial bearing → front housing 1041 → exhaust hole 1061. This flow channel structure arrangement can effectively cool the heat-generating components such as the stator, rotor, radial bearing, and axial bearing separately. 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 used to increase its ventilation and heat dissipation efficiency, thereby realizing effective ventilation and cooling of the overall heat-generating components of the magnetic suspension rotating machinery. The entire heat dissipation system has a simple structure, the heat dissipation process is efficient and reliable, and the stability of the magnetic suspension system is improved.

[0054] like Figure 6 As shown, in another embodiment, the air cooling path is Figure 3 The technical solutions shown are consistent, the difference is that a cooling water channel (that is, water cooling channel 1063, the same below) is added to the outer end of the motor stator, mainly to solve the problem that the overall internal cooling effect is poor when the motor power is too large. The motor water cooling channel is added and combined with the overall air cooling path to effectively cool the motor stator, rotor and magnetic bearings.

[0055] like Figure 7As 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 no additional heat dissipation drive motor is required. The cooling impeller 103 is installed at the rear end of the rotor, and the rear radial bearing is located between the cooling impeller 103 and the motor stator 105. The front end is placed on 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 for guiding the cooling impeller and a rear end cover 1031 to increase air flow conduction and reduce flow resistance, and a plurality of corresponding ventilation holes or ventilation grooves are provided on the rear shell 1042, the cylinder, the front shell 1041 and other parts, and the axial bearing is provided with an inner ring hole for easy air flow conduction. The cooling gas of the cooling impeller is cooled by the flow channel and then radially Bearing, the first route: through the flow channel on the cylinder → the flow channel on the front shell 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 route: through the rotor flow channel to discharge the cooling motor rotor, the two gases converge and are discharged from the cylinder through the exhaust hole 1061. This flow channel structure arrangement can effectively cool the heat-generating components such as the stator, rotor, radial bearing, axial bearing, etc. 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 used 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, the heat dissipation process is efficient and reliable, and the stability of the magnetic levitation system is improved.

[0056] like Figure 8 As shown, in another embodiment, an active pure air-cooled heat dissipation system is adopted, and the cold air is provided by the centrifugal rotation of the rotor, and no additional heat dissipation drive motor is required. The front radial bearing 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 inlet airflow channel (that is, the aforementioned air inlet channel 1001, the same below) inside the rear end of the rotor, passing through the inside of the rotor from back to front, and then passing through several rotor exhaust flow channels (that is, radial through holes) from the inside of the rotor to the outside, which are located between the motor stator 105 and the axial bearing, and the cylinder, the front shell 1041 and other parts are provided with several corresponding ventilation holes or ventilation grooves, and the axial bearing is provided with an inner ring hole for easy airflow conduction, and the rotor is rotated to The cooling gas generated by centrifugation is divided into three cooling paths through the rotor exhaust flow channel: the left end is discharged through the axial stator inner ring hole on the axial bearing → the front radial bearing → the exhaust hole 1061; the two paths on the right end are discharged through the motor stator flow channel and the motor rotor flow channel and then through the rear radial bearing. This flow channel structure arrangement can effectively cool the heat-generating components such as the stator, rotor, radial bearing, and axial bearing separately. 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 used 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] like Figure 5As 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.

[0058] 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.

[0059] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention. These improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A magnetically suspended rotating machine, 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 suspension bearing (101) comprises 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), wherein the second axial stator assembly (3) comprises a second stator core (31) and a second winding (32) assembled on the second stator core (31), wherein 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), wherein the magnetic poles of the first stator core (21) comprise 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); outer flow grooves (51) are formed on the magnetic end faces of the first outer magnetic pole (211) and the second outer magnetic pole (311); inner flow grooves (52) are formed on the magnetic end faces of the first inner magnetic pole (212) and the second inner magnetic pole (312); each of the outer flow grooves (51) and the inner flow grooves (52) extends radially along the thrust plate (4); the cooling airflow can enter the axial magnetic suspension bearing in sequence through the inner flow grooves (52) and the outer flow grooves (51) in the stator core on one side, and flow out of the axial magnetic suspension bearing in sequence through the outer flow grooves (51) and the inner flow grooves (52) in the stator core on the other side.

2. The magnetic levitation rotating machine according to claim 1, 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.

3. The magnetic levitation rotating machine according to claim 1, 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).

4. The magnetic levitation rotating machine according to claim 2, 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).

5. The magnetic levitation rotating machine according to claim 4, 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).

6. The magnetic levitation rotating machine according to claim 4, characterized in that: Auxiliary heat dissipation blades (107) are also mounted on the rotating shaft (100), and the two auxiliary heat dissipation blades (107) are respectively located at two ends of the motor stator (105).

7. The magnetic levitation rotating machine according to claim 6, characterized in that: A radial magnetic bearing (104) is also mounted on the rotating shaft (100) between the motor stator (105) and the cooling impeller (103). The cooling airflow introduced by the cooling impeller (103) enters the radial magnetic bearing (104) and flows out under the drive of the auxiliary heat dissipation blades (107).

8. The magnetic levitation rotating machine 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).

9. The magnetic levitation rotating machine according to claim 8, 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).

10. The magnetic levitation rotating machine 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.

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