Magnetic suspension radial hybrid bearing, magnetic suspension motor and magnetic suspension rotating machine

Abstract

The invention provides a magnetic suspension radial hybrid bearing, a magnetic suspension motor and a magnetic suspension rotating machinery, the bearing comprises a bearing seat and a radial magnetic suspension assembly, the radial magnetic suspension assembly is assembled in a bearing chamber, the radial magnetic suspension assembly comprises an iron core assembly, a permanent magnet and a magnetic conductive radial ring, and the iron core assembly comprises a bearing iron core. The magnetic conductive radial ring is fixedly connected to the radial peripheral wall of the bearing iron core and used for forming a magnetic circuit of the permanent magnet, the magnetic conductive radial ring is further fixedly connected with the bearing seat, a plurality of first heat dissipation air channels are formed in the magnetic conductive radial ring, and cooling airflow can flow in from one side ports of the first heat dissipation air channels and flow out from the other side ports of the first heat dissipation air channels. According to the invention, the first heat dissipation air ducts are arranged on the magnetic conductive radial ring, so that the arrangement positions, the arrangement number and the through-flow area of the first heat dissipation air ducts are not limited by the structure of the bearing iron core any more, the winding groove fullness rate of the control winding can be higher, and the working performance of the bearing can be improved while efficient air cooling of the bearing is ensured.

Description

Technical Field

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

[0002] The magnetic levitation motor is a special motor with non-contact operation between the stator and the rotor. It is widely used in the refrigeration and industrial fields, such as magnetic levitation air compressors, magnetic levitation blowers, magnetic levitation centrifugal refrigeration compressors and other rotating machinery. As the core functional component of the magnetic levitation motor, the magnetic bearing can be divided into active, passive and hybrid bearings. Both active and hybrid bearings use electric current to generate a magnetic field to provide levitation force for the rotor. However, during the use of magnetic bearings, the heat generated by the magnetic bearings is an influence that cannot be ignored. The magnetic bearings used in centrifugal refrigeration compressors can dissipate heat through refrigerants, but the magnetic bearings used in the industrial field, such as magnetic air compressor bearings and magnetic blower bearings, mostly lack additional heat dissipation cooling, which can easily cause the temperature rise of the magnetic bearings to be too high, thereby leading to accelerated aging of parts, increased loss of magnetic bearings, demagnetization of permanent magnets and other problems. In order to overcome the aforementioned deficiencies in the prior art, one method in the related technology is to set a heat dissipation duct on the bearing core to achieve heat dissipation. Due to the relatively limited physical area of ​​the bearing core, this method has high requirements on the location of the heat dissipation duct, otherwise it is very easy to cause magnetic flux saturation in the core and affect the bearing magnetic circuit; another method is to reserve circulation space in the winding slot, which leads to a decrease in the slot fill rate and reduces the working performance of the bearing; in addition, due to the limitations of the core structure and bearing performance, the number of heat dissipation ducts set in the above two conventional methods is relatively limited, and the air cooling effect is relatively low. Summary of the invention

[0003] Therefore, the present invention provides a magnetic levitation radial hybrid bearing, a magnetic levitation motor and a magnetic levitation rotating machine, which can solve the technical problems in the prior art that the air-cooled heat dissipation structure used for the magnetic levitation radial hybrid bearing has a relatively low heat dissipation effect and will have an adverse effect on the bearing performance.

[0004] In order to solve the above problems, the present invention provides a magnetic levitation radial hybrid bearing, including a bearing seat and a radial magnetic levitation assembly. The bearing seat has a bearing chamber, and the radial magnetic levitation assembly is assembled in the bearing chamber. The radial magnetic levitation assembly includes a core assembly, a permanent magnet and a magnetic radial ring. The core assembly includes a bearing core. The magnetic radial ring is fixedly connected to the radial outer peripheral wall of the bearing core to form a magnetic circuit of the permanent magnet. The magnetic radial ring is also fixedly connected to the bearing seat. A plurality of first heat dissipation ducts are constructed in the magnetic radial ring, and the cooling airflow can flow in from one side port of the first heat dissipation duct and flow out from the other side port.

[0005] In some embodiments, a plurality of second heat dissipation ducts are constructed in the bearing seat, each of the second heat dissipation ducts is arranged in a one-to-one correspondence with at least a portion of the first heat dissipation ducts, and a side port of each of the second heat dissipation ducts is connected to a side port of at least a portion of the first heat dissipation ducts.

[0006] In some embodiments, each of the first heat dissipation ducts and the second heat dissipation ducts is parallel to the central axis of the bearing core; and / or each of the first heat dissipation ducts is evenly spaced around the central axis of the bearing core.

[0007] In some embodiments, a plurality of receiving grooves arranged around the magnetic radial ring are formed on the end surface of the magnetic radial ring facing the bottom wall of the bearing chamber, and the permanent magnets are multiple, each of the permanent magnets is assembled in each of the receiving grooves one by one, and each of the first heat dissipation ducts is located radially outside of each of the receiving grooves.

[0008] In some embodiments, the radial magnetic levitation assembly further includes a magnetic end ring connected to an end surface of the magnetic radial ring facing the bottom wall of the bearing chamber to seal the notches of each of the accommodating grooves.

[0009] In some embodiments, an axial protrusion ring extending toward the bottom wall of the bearing chamber is provided on the end surface of the magnetic radial ring facing the bottom wall of the bearing chamber, and the magnetic end ring is assembled in the axial protrusion ring, and the magnetic end ring is gap-fitted with the inner ring wall of the axial protrusion ring.

[0010] In some embodiments, the core assembly also includes a control winding wound on each tooth of the bearing core, the inner ring wall of the magnetic radial ring has a circumferential protrusion extending radially inward, each of the accommodating grooves is located on the end surface of the circumferential protrusion facing the bottom wall of the bearing chamber, the end surface of the bearing core close to the bottom wall of the bearing chamber stops on the end surface of the circumferential protrusion away from the bottom wall of the bearing chamber, the end of the control winding protruding from the end surface of the bearing core close to the bottom wall of the bearing chamber is the first end, the axial thickness of the circumferential protrusion is not less than the axial height of the first end, and the first end is located in the inner ring through hole of the circumferential protrusion.

[0011] In some embodiments, the bearing seat has a positioning through hole that passes through the inside and outside of the bearing chamber, and the outer ring wall of the magnetic radial ring has a threaded hole corresponding to the position of the positioning through hole. The threaded hole extends radially along the magnetic radial ring, and the threaded part is threadedly connected to the threaded hole via the positioning through hole.

[0012] The present invention also provides a magnetic suspension motor, comprising the above-mentioned magnetic suspension radial hybrid bearing.

[0013] The present invention also provides a magnetic levitation rotating machine, comprising the above-mentioned magnetic levitation motor.

[0014] The magnetic suspension radial hybrid bearing, magnetic suspension motor and magnetic suspension rotating machine provided by the present invention have the following beneficial effects:

[0015] A corresponding first heat dissipation duct is constructed in the magnetic radial ring, and the cooling airflow flowing through the first heat dissipation duct can form efficient air cooling for the magnetic radial ring and the bearing core connected to the radial inner side thereof, thereby effectively preventing the bearing core from overheating, and also preventing the high-temperature demagnetization of the permanent magnet caused by the excessive temperature rise of the bearing core. In the present invention, the first heat dissipation duct is arranged on the magnetic radial ring instead of the bearing core, so that the arrangement position, arrangement number and flow area of ​​the first heat dissipation duct are no longer limited by the structural limitation of the bearing core, and the winding slot full rate of the control winding can be higher, which can improve the working performance of the bearing while ensuring efficient air cooling of the bearing.

[0016] Since the magnetic radial ring is located radially outside the bearing core, it has a larger inner diameter and outer diameter, and thus has a larger magnetic conductive area. Under this premise, more first heat dissipation ducts can be provided, thereby ensuring the flow rate and cooling effect of the cooling airflow;

[0017] A corresponding receiving groove is provided on one side end face of the magnetic radial ring, and then the corresponding permanent magnet is received and assembled in the receiving groove. There is no need to use a magnetic steel fixing frame separately provided in the prior art, which reduces the number of assembled parts, reduces the manufacturing cost, and can significantly reduce the axial thickness of the bearing, which is conducive to reducing the axial length of the rotating shaft, thereby increasing the maximum speed of the rotor; more importantly, in the present application, the permanent magnet is directly assembled in the receiving groove on the magnetic radial ring. Since a first heat dissipation duct is formed in the magnetic radial ring, the first heat dissipation duct can be used to form efficient air cooling for the permanent magnet, further reducing the probability of demagnetization of the permanent magnet caused by high temperature;

[0018] By arranging a magnetic end ring connected to a magnetic radial ring on one side of the slot of the receiving slot, on the one hand, the permanent magnet can be sealed and positioned in each receiving slot, simplifying the assembly of each permanent magnet (at this time, the permanent magnet only needs to be placed in the corresponding receiving slot to form a circumferential positioning, and the magnetic end ring is used to form an axial positioning of each permanent magnet). On the other hand, the magnetic end ring allows the bias magnetic field to flow in the radial direction, so that the air gap between the radial inner side and the rotating shaft is minimized to ensure the bias effect.

[0019] On the one hand, the circumferential convex ring serves as an axial positioning structure of the bearing core to ensure that the bearing core can be assembled in place and ensure assembly accuracy. On the other hand, its inner ring hole forms an accommodation space for the first end of the control winding. Since the first heat dissipation duct and the circumferential convex ring are both located on the magnetic radial ring, the circumferential convex ring can effectively dissipate heat and cool the first end and each permanent magnet, thereby further reducing the temperature rise of the bearing.

[0020] The third heat dissipation air duct in the circumferential convex ring can further enhance the cooling capability of the circumferential convex ring on the first end and the permanent magnet. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] 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.

[0022] Figure 1 Schematic diagram of the internal structure of a magnetic suspension radial hybrid bearing according to an embodiment of the present invention;

[0023] Figure 2 yes Figure 1 Left view of

[0024] Figure 3 yes Figure 1 Right view of;

[0025] Figure 4 yes Figure 1 External schematic diagram of the bearing seat in FIG.

[0026] Figure 5 yes Figure 4 Right view of;

[0027] Figure 6 yes Figure 1 A schematic diagram of an axial cross section of a magnetic radial ring;

[0028] Figure 7 yes Figure 6 Right view of;

[0029] Figure 8 yes Figure 1 An axial view of the magnetic end ring in FIG.

[0030] Fig. 9 yes Figure 1 Schematic diagram of the structure of the permanent magnet.

[0031] The accompanying drawings are marked as follows:

[0032] 1. Bearing seat; 10. Bearing chamber; 11. Second heat dissipation duct; 12. Positioning through hole; 21. Core assembly; 211. Bearing core; 212. Control winding; 22. Permanent magnet; 23. Magnetic radial ring; 231. First heat dissipation duct; 232. Accommodation groove; 233. Circumferential convex ring; 24. Magnetic end ring. DETAILED DESCRIPTION

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] See also Figure 1 and Fig. 9 As shown, according to an embodiment of the present invention, a magnetic suspension radial hybrid bearing is provided, including a bearing seat 1 (also referred to as a bearing shell), a radial magnetic suspension component (not labeled in the figure), the bearing seat 1 having a bearing chamber 10, the radial magnetic suspension component is assembled in the bearing chamber 10, with a specific use state as a reference, the bearing chamber 10 is along the axial direction of the rotating shaft and opens to one side, and the opposite side of the opening is the bottom wall of the bearing chamber 10, and the radial magnetic suspension component is assembled in the bearing chamber 10 through the opening. Specifically, the radial magnetic suspension component includes a core component 21, a permanent magnet 22 and a magnetic radial ring 23, the core component 21 includes a bearing core 211, a control winding 212 (that is, an energized coil) wound on each tooth of the bearing core 211, it can be understood that the aforementioned control winding 212 is used to form a control magnetic field, and the magnetic radial ring 23 is fixedly connected to the radial of the bearing core 211. The outer wall is used to form a magnetic circuit for the permanent magnet 22. The main purpose of setting the magnetic radial ring 23 is to be able to circulate the bias magnetic field formed by the permanent magnet 22. The magnetic radial ring 23 is also fixedly connected to the bearing seat 1. Specifically, the magnetic radial ring 23 is accommodated and assembled in the bearing chamber 10. A plurality of first heat dissipation ducts 231 are constructed in the magnetic radial ring 23. The cooling air flow can flow in from one side port of the first heat dissipation duct 231 and flow out from the other side port. In specific application, the cooling air flow flows into the first heat dissipation duct 231 from one side port, exchanges heat with the magnetic radial ring 23, and then flows out from the other side port of the first heat dissipation duct 231. It can be understood that the heat in the bearing core 211 is conducted to the magnetic radial ring 23 to be dissipated. It should be noted that which side port of the aforementioned first heat dissipation duct 231 serves as the inlet side of the cooling air flow is determined by the driving component of the cooling air flow.

[0038] In this technical solution, a corresponding first heat dissipation duct 231 is constructed in the magnetic radial ring 23, and the cooling air flow flowing through the first heat dissipation duct 231 can form efficient air cooling for the magnetic radial ring 23 and the bearing core 211 connected to the radial inner side thereof, thereby effectively preventing the bearing core 211 from overheating, and preventing the high-temperature demagnetization of the permanent magnet 22 caused by the excessive temperature rise of the bearing core 211. In the present invention, the first heat dissipation duct 231 is arranged on the magnetic radial ring 23 instead of the bearing core 211, so that the setting position, setting number and flow area of ​​the first heat dissipation duct 231 are no longer limited by the structural limitation of the bearing core 211, and the winding slot full rate of the control winding 212 can be higher, which can improve the bearing working performance while ensuring efficient air cooling of the bearing. In addition, it should be specially noted that the aforementioned magnetic radial ring 23 is located radially outside the bearing core 211, and has a larger inner diameter and outer diameter, and therefore has a larger magnetic conductive area. Under this premise, more first heat dissipation ducts 231 can be set, thereby ensuring the flow rate and cooling effect of the cooling airflow.

[0039] In a preferred embodiment, a plurality of second heat dissipation ducts 11 are constructed in the bearing seat 1, and each of the second heat dissipation ducts 11 is respectively arranged in a one-to-one correspondence with at least a portion of the first heat dissipation ducts 231, and a side port of each of the second heat dissipation ducts 11 is connected to a side port of at least a portion of the first heat dissipation ducts 231.

[0040] In this technical solution, by at least partially connecting the first heat dissipation ducts 231 in the magnetic radial ring 23 with the second heat dissipation ducts 11 in the bearing seat 1, smooth connection of the cooling airflow is achieved, and efficient cooling of the bearing seat 1 can be achieved without the need to separately set up a cooling structure for the bearing seat 1, and the structure is simple.

[0041] In a preferred embodiment, each of the first heat dissipation ducts 231 and the second heat dissipation duct 11 are parallel to the central axis of the bearing core 211, and it can be understood that the central axis of the bearing core 211 coincides with the central axis of the aforementioned bearing chamber 10. Taking the aforementioned central axis as a horizontal line, each of the first heat dissipation ducts 231 and the second heat dissipation duct 11 is connected left and right, and the structure is particularly simple; in a more preferred embodiment, each of the first heat dissipation ducts 231 is evenly spaced around the central axis of the bearing core 211, that is, the circumferential spacing between each of the first heat dissipation ducts 231 is equal, and accordingly, the second heat dissipation duct 11 is also evenly spaced in the circumferential direction of the bearing core 211, so that uniform cooling and heat dissipation of the bearing core 211 in the circumferential direction can be ensured, which is conducive to ensuring the uniformity of the deformation of the bearing core 211 in its circumferential direction, and further ensuring the control accuracy of the radial suspension force of the radial bearing.

[0042] In some embodiments, a plurality of receiving grooves 232 are formed on the end surface of the magnetic radial ring 23 facing the bottom wall of the bearing chamber 10, and the aforementioned iron core assembly is located on the side of the receiving groove 232 away from the bottom wall of the bearing chamber 10. There are multiple permanent magnets 22, and each of the permanent magnets 22 is respectively assembled in each of the receiving grooves 232 one by one, and each of the first heat dissipation ducts 231 is located radially outside of each of the receiving grooves 232. The shape of the aforementioned receiving grooves 232 matches the shape of the permanent magnet 22. For example, the permanent magnet 22 is fan-shaped, and the shape of each receiving groove 232 is also fan-shaped accordingly. The size of each receiving groove 232 is consistent with the size of each permanent magnet 22, and the size of each permanent magnet 22 is the same.

[0043] In this technical solution, a corresponding receiving groove 232 is provided on one side end face of the magnetic radial ring 23, and then the corresponding permanent magnet 22 is received and assembled in the receiving groove 232. There is no need to adopt a magnetic steel fixing frame separately provided in the prior art, which reduces the number of assembled parts and reduces the manufacturing cost. At the same time, it can also significantly reduce the axial thickness of the bearing, which is beneficial to reduce the axial length of the rotating shaft, and then can increase the maximum speed of the rotor; more importantly, in the present application, the permanent magnet 22 is directly assembled in the receiving groove 232 on the magnetic radial ring 23. Since a first heat dissipation duct 231 is formed in the magnetic radial ring 23, the first heat dissipation duct 231 can be used to form efficient air cooling for the permanent magnet 22, thereby further reducing the probability of demagnetization of the permanent magnet 22 caused by high temperature.

[0044] In order to further optimize the flow direction of the bias magnetic field, in a preferred embodiment, the radial magnetic levitation assembly also includes a magnetic end ring 24, which is connected to the end surface of the magnetic radial ring 23 facing the bottom wall of the bearing chamber 10 to seal the notches of each of the accommodating grooves 232.

[0045] In this technical solution, by providing a magnetic end ring 24 connected to the magnetic radial ring 23 on one side of the notch of the receiving groove 232, on the one hand, the permanent magnet 22 can be sealed and positioned in each receiving groove 232, thereby simplifying the assembly of each permanent magnet 22 (at this time, the permanent magnet 22 only needs to be placed in the corresponding receiving groove 232 to form a circumferential positioning, and the axial positioning of each permanent magnet 22 is formed by the magnetic end ring 24). On the other hand, the magnetic end ring 24 allows the bias magnetic field to flow radially, thereby minimizing the air gap between the radial inner side and the rotating shaft, thereby ensuring the bias effect.

[0046] In a specific embodiment, eight permanent magnets 22 are provided to reduce the manufacturing cost of the permanent magnets 22 .

[0047] The aforementioned magnetic radial ring 23 and the magnetic end ring 24 can be made of magnetic materials such as 45 steel, and the aforementioned bearing seat 1 can be made of aluminum alloy 6061 or other aluminum alloy materials with higher hardness. The processing method can be mold cast aluminum processing or precision lathe processing, which is easy to achieve in structure.

[0048] In some embodiments, the end surface of the magnetic radial ring 23 facing the bottom wall of the bearing chamber 10 also has an axial convex ring (not marked in the figure) extending toward the bottom wall of the bearing chamber 10. During the specific assembly, the axial positioning of the radial magnetic suspension assembly is achieved by the abutment stop between the outer end surface of the axial convex ring and the bottom wall of the bearing chamber 10. The magnetic end ring 24 is assembled in the axial convex ring, and the magnetic end ring 24 and the inner ring wall of the axial convex ring are gap-matched. The magnetic end ring 24 is provided with a plurality of connection holes for screws to pass through, and is connected to the end surface of the magnetic radial ring 23 by a plurality of screws. It should be noted that the depth of the accommodating groove 232 is preferably equal to the thickness of the permanent magnet 22, so that the magnetic end ring 24 does not need to be further structurally designed and processed accordingly, which simplifies the structural design of the magnetic end ring 24. It can be understood that the magnetic end ring 24 should not protrude from the free end surface of the axial convex ring after assembly.

[0049] In some embodiments, the inner ring wall of the magnetic radial ring 23 has a circumferential convex ring 233 extending radially inward, and each of the accommodating grooves 232 is located on the end surface of the circumferential convex ring 233 facing the bottom wall of the bearing chamber 10, and the end surface of the bearing core 211 close to the bottom wall of the bearing chamber 10 is stopped on the end surface of the circumferential convex ring 233 away from the bottom wall of the bearing chamber 10, thereby realizing the axial position positioning of the bearing core 211 by the circumferential convex ring 233, the bearing core 211 and the inner ring wall of the magnetic radial ring 23 have an interference fit, the end of the control winding 212 protruding from the end surface of the bearing core 211 close to the bottom wall of the bearing chamber 10 is the first end (not marked in the figure), the axial thickness of the circumferential convex ring 233 is not less than the axial height of the first end, and the first end is located in the inner ring through hole of the circumferential convex ring 233.

[0050] In this technical solution, the circumferential convex ring 233, on the one hand, serves as an axial positioning structure of the bearing core 211, ensuring that the bearing core 211 can be assembled in place and ensuring assembly accuracy; on the other hand, its inner ring hole forms an accommodating space for the first end of the control winding 212. Since the first heat dissipation duct 231 and the circumferential convex ring 233 are both on the magnetic radial ring 23, the circumferential convex ring 233 can achieve effective heat dissipation and cooling of the first end and each permanent magnet 22, thereby further reducing the temperature rise of the bearing.

[0051] In another preferred embodiment, the first heat dissipation duct 231 further includes a third heat dissipation duct (not shown in the figure, not labeled) extending toward one side of the circumferential convex ring 233 and located in the circumferential convex ring 233, so that the cooling capacity of the circumferential convex ring 233 for the first end and the permanent magnet 22 can be further enhanced.

[0052] In some embodiments, the bearing seat 1 has a positioning through hole 12 that passes through the inside and outside of the bearing chamber 10, and the outer ring wall of the magnetic radial ring 23 has a threaded hole corresponding to the position of the positioning through hole 12. The threaded hole extends radially along the magnetic radial ring 23, and a threaded part (not shown in the figure, such as a bolt) is threadedly connected to the threaded hole via the positioning through hole 12, thereby locking the circumferential rotation direction of the magnetic radial ring 23.

[0053] According to an embodiment of the present invention, there is also provided a magnetic levitation motor, comprising the above-mentioned magnetic levitation radial hybrid bearing.

[0054] According to an embodiment of the present invention, there is also provided a magnetic levitation rotating machine, such as a magnetic levitation air compressor, a magnetic levitation blower, a magnetic levitation centrifugal refrigeration compressor, etc., comprising the above-mentioned magnetic levitation motor.

[0055] 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.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention. These improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A magnetic suspension radial hybrid bearing, characterized in that: The invention comprises a bearing seat (1) and a radial magnetic levitation component, wherein the bearing seat (1) has a bearing chamber (10), the radial magnetic levitation component is assembled in the bearing chamber (10), the radial magnetic levitation component comprises an iron core component (21), a permanent magnet (22) and a magnetic radial ring (23), the iron core component (21) comprises a bearing core (211), the magnetic radial ring (23) is fixedly connected to the radial outer peripheral wall of the bearing core (211) to form a magnetic circuit of the permanent magnet (22), the magnetic radial ring (23) is also fixedly connected to the bearing seat (1), and a plurality of first heat dissipation ducts (231) are constructed in the magnetic radial ring (23), and cooling air can flow in from a port on one side of the first heat dissipation duct (231) and flow out from a port on the other side.

2. The magnetic suspension radial hybrid bearing according to claim 1, characterized in that: A plurality of second heat dissipation air ducts (11) are constructed in the bearing seat (1), each of the second heat dissipation air ducts (11) is arranged in one-to-one correspondence with at least part of the first heat dissipation air duct (231), and a side port of each of the second heat dissipation air ducts (11) is butt-connected to a side port of at least part of the first heat dissipation air duct (231).

3. The magnetic suspension radial hybrid bearing according to claim 2, characterized in that: Each of the first heat dissipation ducts (231) and the second heat dissipation ducts (11) is parallel to the central axis of the bearing core (211); and / or each of the first heat dissipation ducts (231) is evenly spaced around the central axis of the bearing core (211).

4. The magnetically suspended radial hybrid bearing according to any one of claims 1 to 3, characterized in that: A plurality of receiving grooves (232) arranged around the magnetic radial ring (23) are formed on the end surface of the magnetic radial ring (23) on the side of the bottom wall facing the bearing chamber (10), the permanent magnets (22) are multiple, each of the permanent magnets (22) is assembled in each of the receiving grooves (232) in a one-to-one correspondence, and each of the first heat dissipation ducts (231) is located radially outside each of the receiving grooves (232).

5. The magnetic suspension radial hybrid bearing according to claim 4, characterized in that: The radial magnetic levitation assembly also includes a magnetic end ring (24), which is connected to the end surface of the magnetic radial ring (23) on the side of the bottom wall facing the bearing chamber (10) to seal the notches of each of the accommodating grooves (232).

6. The magnetic suspension radial hybrid bearing according to claim 5, characterized in that: An axial convex ring extending toward the bottom wall of the bearing chamber (10) is also provided on the end surface of the magnetic radial ring (23) facing the bottom wall of the bearing chamber (10); a magnetic end ring (24) is assembled in the axial convex ring, and a clearance fit is formed between the magnetic end ring (24) and the inner ring wall of the axial convex ring.

7. The magnetic suspension radial hybrid bearing according to claim 4, characterized in that: The core assembly (21) further comprises a control winding (212) wound on each tooth of the bearing core (211); the inner ring wall of the magnetic radial ring (23) comprises a circumferential convex ring (233) extending radially inward; each of the accommodating grooves (232) is located on an end surface of the circumferential convex ring (233) facing the bottom wall of the bearing chamber (10); an end surface of the bearing core (211) close to the bottom wall of the bearing chamber (10) abuts against an end surface of the circumferential convex ring (233) away from the bottom wall of the bearing chamber (10); an end of the control winding (212) protruding from an end surface of the bearing core (211) close to the bottom wall of the bearing chamber (10) is a first end; an axial thickness of the circumferential convex ring (233) is not less than an axial height of the first end; and the first end is located in an inner ring through hole of the circumferential convex ring (233).

8. The magnetic suspension radial hybrid bearing according to claim 1, characterized in that: The bearing seat (1) has a positioning through hole (12) that passes through the inside and outside of the bearing chamber (10); the outer ring wall of the magnetic radial ring (23) has a threaded hole corresponding to the position of the positioning through hole (12); the threaded hole extends radially along the magnetic radial ring (23); and the threaded part is threadedly connected to the threaded hole via the positioning through hole (12).

9. A magnetic levitation motor, characterized in that: The invention comprises the magnetic suspension radial hybrid bearing according to any one of claims 1 to 8.

10. A magnetically suspended rotating machine, characterized in that: The invention comprises the magnetic levitation motor as described in claim 9.

Images