Hybrid magnetic suspension bearing, magnetic suspension motor and magnetic suspension rotating equipment

Abstract

The invention provides a hybrid magnetic suspension bearing, a magnetic suspension motor and magnetic suspension rotating equipment, the hybrid magnetic suspension bearing comprises a bearing shell, the bearing shell is provided with a bearing chamber, a radial ring is assembled in the bearing chamber, the radial ring is sleeved on the radial peripheral wall of a stator core of a bearing stator assembly, and the bearing stator assembly is provided with a rotor. A cooling flow channel arranged around the central axis of the radial ring is formed in the radial ring, and the cooling flow channel can be in circulating communication with an external cooling source through a flow channel inlet and a flow channel outlet of the cooling flow channel. Heat generated when the stator winding is powered on is efficiently absorbed and transferred to the outer side of the bearing to be dissipated, temperature rise of the magnetic suspension bearing is effectively prevented, aging of parts such as the stator winding is delayed, potential safety hazards are eradicated, magnetic bearing loss is reduced, high-temperature demagnetization of the permanent magnets is prevented, and maintenance cost is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of magnetic suspension bearing design, and in particular relates to a hybrid magnetic suspension bearing, a magnetic suspension motor, and a magnetic suspension rotating device. 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 refrigeration and industrial fields, such as magnetic levitation air compressors, magnetic levitation blowers, magnetic levitation centrifugal refrigeration compressors and many other occasions. Magnetic bearings (also called magnetic bearings) 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 heating of magnetic bearings is an influence that cannot be ignored. The magnetic levitation bearings used in centrifugal refrigeration compressors can dissipate heat through refrigerants, but the magnetic levitation air compressor bearings and magnetic levitation blower bearings used in the industrial field do not have additional heat dissipation cooling, which can easily cause the temperature rise of the magnetic bearings to be too high, the aging of parts to be accelerated, the loss of magnetic bearings to increase, and the demagnetization of permanent magnets. Summary of the invention

[0003] Therefore, the present invention provides a hybrid magnetic levitation bearing, a magnetic levitation motor, and a magnetic levitation rotating device, which can overcome the technical problems in the related art that the hybrid magnetic levitation bearing lacks an effective cooling structure, resulting in excessive temperature rise of the magnetic bearing, accelerated aging of components, increased loss of the magnetic bearing, and demagnetization of the permanent magnet.

[0004] In order to solve the above problems, the present invention provides a hybrid magnetic levitation bearing, including a bearing shell, the bearing shell having a bearing chamber, a radial ring assembled in the bearing chamber, the radial ring is sleeved on the radial outer peripheral wall of the stator core of the bearing stator assembly, a cooling channel arranged around the central axis is formed in the radial ring, and the cooling channel can be circulated and connected with an external cooling source through the channel inlet and the channel outlet.

[0005] In some embodiments, the flow channel inlet and the flow channel outlet are respectively located on opposite radial sides of the radial ring; and / or, the bearing housing has a first through hole corresponding to the flow channel inlet and a second through hole corresponding to the flow channel outlet, and the flow channel inlet and the flow channel outlet are both threaded holes extending radially along the radial ring.

[0006] In some embodiments, the radial outer peripheral wall of the radial ring has a positioning protrusion protruding radially outward, the wall surface of the bearing chamber cooperating with the radial ring has a positioning groove slidably connected to the positioning protrusion, and the positioning protrusion can be inserted into the positioning groove along the axial direction of the radial ring; and / or the radial ring is injection molded.

[0007] In some embodiments, the bearing chamber includes a chamber bottom wall perpendicular to the central axis of the radial ring and a chamber ring wall arranged around the central axis of the radial ring, the positioning groove is formed on the chamber ring wall and extends along the axial direction of the radial ring to the open end face of the bearing chamber; and / or, two of the positioning protrusions and two of the positioning grooves are respectively provided.

[0008] In some embodiments, the radial ring has an inner end surface axially stop-connected to the bottom wall of the chamber and an outer end surface corresponding to the position of the open end, a stator assembly hole is formed on the outer end surface, the bearing stator assembly is connected to the stator assembly hole via the stator core, and / or a plurality of magnetic steel slots are formed on the inner end surface and are spaced apart around the central axis of the radial ring, and each permanent magnet is accommodated and positioned in each of the magnetic steel slots one by one.

[0009] In some embodiments, the inner end surface has a plurality of bosses protruding axially along the radial ring, and the magnetic steel groove is formed between two adjacent bosses. The hybrid magnetic levitation bearing also includes a magnetic conductive ring, which is detachably connected to the boss end surface of each boss.

[0010] In some embodiments, an axial protrusion height of the boss is not greater than an axial thickness of the permanent magnet.

[0011] In some embodiments, the bearing housing is made of non-magnetic material.

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

[0013] The present invention also provides a magnetic suspension rotating device, comprising the above-mentioned hybrid magnetic suspension bearing.

[0014] A hybrid magnetic suspension bearing, a magnetic suspension motor, and a magnetic suspension rotating device provided by the present invention have the following beneficial effects:

[0015] By arranging a cooling channel in the radial ring, a coolant such as cooling water or cooling oil can circulate therein. Since the radial ring is in direct contact with the stator core in the bearing stator assembly, the heat generated by the stator winding when power is turned on can be efficiently absorbed and transferred to the outside of the bearing for dissipation, thereby effectively preventing the temperature rise of the magnetic suspension bearing, delaying the aging of components such as the stator winding to eliminate safety hazards, reducing the loss of the magnetic bearing, preventing the permanent magnet from demagnetizing at high temperature, and reducing maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] 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.

[0017] Figure 1 is a schematic diagram of the internal structure of a hybrid magnetic bearing in an embodiment of the present invention;

[0018] Figure 2 yes Figure 1 Left side view of the hybrid magnetic bearing;

[0019] Figure 3 yes Figure 1 Right side view of the hybrid magnetic bearing;

[0020] Figure 4 yes Figure 1 A cross-sectional view of the radial ring in;

[0021] Figure 5 yes Figure 4 Left view of the radial ring in;

[0022] Figure 6 yes Figure 1 A front view of the bearing housing in FIG.

[0023] Figure 7 yes Figure 6 Left side view of the bearing housing in;

[0024] Figure 8 yes Figure 1 Front view of the magnetic ring in .

[0025] The accompanying drawings are marked as follows:

[0026] 1. Bearing housing; 11. Bearing chamber; 121. First through hole; 122. Second through hole; 13. Positioning groove; 2. Radial ring; 21. Cooling channel; 211. Channel inlet; 212. Channel outlet; 22. Positioning protrusion; 23. Magnetic steel groove; 24. Boss; 241. Threaded hole; 25. Stator assembly hole; 31. Stator core; 32. Stator winding; 4. Permanent magnet; 5. Magnetic ring; 51. Connecting through hole. DETAILED DESCRIPTION

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] See also Figures 1 to 8As shown, according to an embodiment of the present invention, a hybrid magnetic bearing is provided, comprising a bearing housing 1, wherein the bearing housing 1 has a bearing chamber 11, wherein a radial ring 2 is assembled in the bearing chamber 11, wherein the radial ring 2 is sleeved on the radial outer peripheral wall of a stator core 31 of a bearing stator assembly (not labeled in the figure), wherein a stator winding 32 is arranged on the stator teeth of the stator core 31, wherein a current is passed through the stator winding 32 to adjust the suspension position of the rotating shaft of the hybrid magnetic bearing of the present invention, wherein a cooling channel 21 arranged around the central axis thereof is formed in the radial ring 2, wherein the cooling channel 21 can be cyclically connected with an external cooling source through a channel inlet 211 and a channel outlet 212 thereof, wherein the cooling channel 21 can be, for example, an annular channel, or a spiral or helical channel, wherein the external cooling source can, in principle, be any structure as long as it can dissipate the heat absorbed by the coolant in the cooling channel 21 by heat exchange outside the bearing, such as a heat exchanger, wherein the coolant can be cooling water, cooling oil, etc.

[0032] In this technical solution, by arranging a cooling channel 21 in the radial ring 2, a coolant such as cooling water or cooling oil can circulate therein. Since the radial ring 2 is in direct contact with the stator core 31 in the bearing stator assembly, the heat generated by the stator winding 32 when powered on can be efficiently absorbed and transferred to the outside of the bearing for dissipation, thereby effectively preventing the temperature rise of the magnetic suspension bearing, delaying the aging of components such as the stator winding 32 to eliminate safety hazards, reducing magnetic bearing losses, preventing high-temperature demagnetization of permanent magnets, and reducing maintenance costs.

[0033] Specifically, if the temperature of the magnetic bearing is too high, it will cause the insulation layer of the magnetic bearing winding to age, and over time it will cause the insulation layer to crack, resulting in faults such as short circuits and grounding, which seriously affect the service life of the magnetic bearing. In the present invention, the cooling channel 21 is arranged in the radial ring 2, which can more efficiently transfer the heat generated by the bearing stator assembly to the outside of the bearing, that is, to achieve cooling and heat dissipation, and effectively avoid excessive temperature rise. If the temperature of the magnetic bearing is too high, the magnetic field inside the magnetic bearing will change, and the loss caused by the magnetic bearing will increase, thereby causing the efficiency of the motor or the entire system to decrease, resulting in energy waste. In the present invention, the efficient heat dissipation effect of the cooling channel 21 can overcome the occurrence of the above-mentioned shortcomings; when the temperature of the magnetic bearing is too high, the hybrid magnetic bearing is equipped with rare earth permanent magnets. When the external temperature is too high, the rare earth permanent magnets will cause the permanent magnets to demagnetize. This demagnetization is an irreversible process for the permanent magnets. The setting of the cooling channel 21 of the present invention prevents the above-mentioned demagnetization phenomenon caused by excessive temperature.

[0034] In order to further improve the heat conduction efficiency between the radial ring 2 and the coolant in the cooling channel 21, in some embodiments, the cooling channel 21 is provided with fins (not shown in the figure and not labeled) extending radially outward along the radial ring 2 on the channel wall surface close to the stator core 31, and each of the fins is constructed with a flow hole (not shown in the figure). In this way, the contact area between the coolant and the physical structure of the radial ring 2 can be increased in the cooling channel 21, thereby improving the heat absorption capacity of the coolant.

[0035] In some embodiments, the radial ring 2 is injection molded to facilitate complete and sealed formation of the cooling channel 21 therein.

[0036] In order to ensure that the heat exchange between the coolant and the radial ring 2 in the cooling channel 21 is fully balanced, in some embodiments, the channel inlet 211 and the channel outlet 212 are respectively located on opposite radial sides of the radial ring 2, that is, the coolant is introduced into the cooling channel 21 from one end of a diameter of the radial ring 2 to form a circumferential encirclement of the bearing stator assembly, and then flows out of the cooling channel 21 from the other end of the diameter.

[0037] In some embodiments, the bearing housing 1 has a first through hole 121 corresponding to the flow channel inlet 211 and a second through hole 122 corresponding to the flow channel outlet 212, and the flow channel inlet 211 and the flow channel outlet 212 are both threaded holes extending radially along the radial ring 2. Preferably, the first through hole 121 and the second through hole 122 are coaxial with the threaded hole, and the inner diameter is larger than the threaded hole.

[0038] In this technical solution, the pipe joint of the external cooling source can form a threaded sealing connection with the flow channel inlet 211 and the flow channel outlet 212 respectively through the aforementioned first through hole 121 and the second through hole 122, and the pipeline layout is reasonable.

[0039] In some embodiments, the radial outer wall of the radial ring 2 has a positioning protrusion 22 protruding radially outward, and the wall surface of the bearing chamber 11 that cooperates with the radial ring 2 has a positioning groove 13 that is slidably connected to the positioning protrusion 22. The positioning protrusion 22 can be inserted into the positioning groove 13 along the axial direction of the radial ring 2. It can be understood that the setting position of the aforementioned positioning protrusion 22 is fixed with the relative position of the flow channel inlet 211 and the flow channel outlet 212, and the setting position of the aforementioned positioning groove 13 is fixed with the relative position of the first through hole 121 and the second through hole 122. In this way, when the positioning protrusion 22 is assembled in the positioning groove 13, it can ensure that the first through hole 121 is aligned with the flow channel inlet 211, and the second through hole 122 is aligned with the flow channel outlet 212.

[0040] In some embodiments, the bearing chamber 11 includes a chamber bottom wall (not labeled in the figure) perpendicular to the central axis of the radial ring 2 and a chamber ring wall (not labeled in the figure) arranged around the central axis of the radial ring 2, and the positioning groove 13 is formed on the chamber ring wall and extends along the axial direction of the radial ring 2 to the open end face of the bearing chamber 11.

[0041] In this technical solution, since the positioning groove 13 is formed on the chamber ring wall and has a notch on the end surface of its opening end, it can indicate the position adjustment of the radial ring 2 and the bearing housing 1 during the assembly process, making the assembly process more convenient.

[0042] In some embodiments, two positioning protrusions 22 and two positioning grooves 13 are respectively provided. As a preferred implementation method, the two positioning protrusions 22 are symmetrical to each other about the geometric center of the radial ring 2. It can be understood that at this time, the sliding insertion between the positioning protrusion 22 and the positioning groove 13 can also guide the assembly of the radial ring 2, further facilitating the assembly process of the radial ring 2 and the bearing housing 1.

[0043] In some embodiments, the radial ring 2 has an inner end surface connected to the axial stop (i.e., stop contact) of the chamber bottom wall and an outer end surface corresponding to the position of the open end, a stator assembly hole 25 is formed on the outer end surface, the bearing stator assembly is connected to the stator assembly hole 25 via the stator core 31, and a plurality of magnetic steel slots 23 are formed on the inner end surface and are arranged at intervals around the central axis of the radial ring 2, and each permanent magnet 4 is accommodated and positioned in each magnetic steel slot 23 in a one-to-one correspondence. In a specific embodiment, the aforementioned permanent magnet 4 is in a sector ring shape.

[0044] In this technical solution, a magnetic steel groove 23 is provided on the inner end surface where the radial ring 2 cooperates with the bottom wall of the chamber, and each permanent magnet 4 is assembled in the magnetic steel groove 23 in a one-to-one correspondence. The bottom wall of the chamber can be used to form an axial stop for each permanent magnet 4. At the same time, the bearing stator assembly is provided at the opening position of the bearing chamber 11, and has a larger open surface, which is conducive to the heat dissipation of the stator winding 32. For example, when the corresponding equipment is also equipped with a cooling fan, the airflow generated by the cooling fan drive is used to form a composite heat dissipation for the stator core 31 and the stator winding 32, further improving the heat dissipation effect. In addition, the magnetic steel groove 23 is directly constructed on the inner end surface to form a circumferential limit for each permanent magnet 4, and there is no need to set a magnetic steel fixing frame in the prior art, which simplifies the assembly process and improves the assembly efficiency.

[0045] In some embodiments, the inner end surface has a plurality of bosses 24 protruding along the axial direction of the radial ring 2, and the magnetic steel groove 23 is formed between two adjacent bosses 24. The hybrid magnetic bearing further includes a magnetic conductive ring 5, which is detachably connected to the boss end surface of each boss 24. The magnetic conductive ring 5 can be specifically provided with corresponding connecting through holes 51, and corresponding threaded holes 241 are provided at positions corresponding to each connecting through hole 51 on the boss 24, so that the magnetic conductive ring 5 can be detachably connected to the radial ring 2 by means of screws.

[0046] In this technical solution, the aforementioned magnetic ring 5 can form a guiding flow for the magnetic circuit of the permanent magnet 4 to ensure the working performance of the bearing. At the same time, the magnetic ring 5 is connected to each boss 24 to ensure the reliable axial positioning of each permanent magnet 4 and reduce the wall surface processing accuracy of the aforementioned chamber bottom wall.

[0047] In some embodiments, the axial protrusion height of the boss 24 is not greater than the axial thickness of the permanent magnet 4 , so as to ensure that the magnetic conductive ring 5 can reliably fix the axial position of each permanent magnet 4 .

[0048] It can be understood that the magnetic ring 5 and the radial ring 2 are made of magnetic materials such as 45# steel. Correspondingly, the material of the bearing housing 1 is non-magnetic materials such as aluminum alloy 6061 or other aluminum alloy materials with higher hardness. The processing method can be mold cast aluminum processing, which is easy to implement in structure.

[0049] According to an embodiment of the present invention, there is also provided a magnetic levitation motor, comprising the above-mentioned hybrid magnetic levitation bearing.

[0050] According to an embodiment of the present invention, there is also provided a magnetically suspended rotating device, comprising the above-mentioned hybrid magnetically suspended bearing, such as a magnetically suspended air compressor or a magnetically suspended blower.

[0051] 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.

[0052] 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 hybrid magnetic bearing, characterized in that: The invention comprises a bearing housing (1), wherein the bearing housing (1) has a bearing chamber (11), wherein a radial ring (2) is assembled in the bearing chamber (11), wherein the radial ring (2) is sleeved on the radial outer peripheral wall of the stator core (31) of the bearing stator assembly, wherein a cooling flow channel (21) arranged around the central axis thereof is formed in the radial ring (2), and wherein the cooling flow channel (21) can be circulated and connected with an external cooling source via a flow channel inlet (211) and a flow channel outlet (212) thereof.

2. The hybrid magnetic bearing according to claim 1, characterized in that: The flow channel inlet (211) and the flow channel outlet (212) are respectively located on two opposite radial sides of the radial ring (2); and / or the bearing housing (1) has a first through hole (121) corresponding to the flow channel inlet (211) and a second through hole (122) corresponding to the flow channel outlet (212), and the flow channel inlet (211) and the flow channel outlet (212) are both threaded holes extending radially along the radial ring (2).

3. The hybrid magnetic bearing according to claim 1 or 2, characterized in that: The radial ring (2) has a positioning protrusion (22) protruding radially outward on its radial outer peripheral wall, and the wall surface of the bearing chamber (11) that cooperates with the radial ring (2) has a positioning groove (13) that is slidably connected to the positioning protrusion (22), and the positioning protrusion (22) can be inserted into the positioning groove (13) along the axial direction of the radial ring (2); and / or the radial ring (2) is injection molded.

4. The hybrid magnetic bearing according to claim 3, characterized in that: The bearing chamber (11) comprises a chamber bottom wall perpendicular to the central axis of the radial ring (2) and a chamber ring wall arranged around the central axis of the radial ring (2); the positioning groove (13) is formed on the chamber ring wall and extends along the axial direction of the radial ring (2) to the open end surface of the bearing chamber (11); and / or, two of the positioning protrusions (22) and two of the positioning grooves (13) are respectively arranged.

5. The hybrid magnetic bearing according to claim 4, characterized in that: The radial ring (2) has an inner end surface axially abutted against the bottom wall of the chamber and an outer end surface corresponding to the position of the open end, a stator assembly hole (25) is formed on the outer end surface, the bearing stator assembly is connected to the stator assembly hole (25) via the stator core (31), and / or a plurality of magnetic steel slots (23) are formed on the inner end surface and are arranged at intervals around the central axis of the radial ring (2), and each permanent magnet (4) is accommodated and positioned in each magnetic steel slot (23) in a one-to-one correspondence.

6. The hybrid magnetic bearing according to claim 5, characterized in that: The inner end surface is provided with a plurality of bosses (24) protruding along the axial direction of the radial ring (2), and the magnetic steel groove (23) is formed between two adjacent bosses (24). The hybrid magnetic suspension bearing also includes a magnetic conductive ring (5), and the magnetic conductive ring (5) is detachably connected to the boss end surface of each boss (24).

7. The hybrid magnetic bearing according to claim 6, characterized in that: The axial protrusion height of the boss (24) is no greater than the axial thickness of the permanent magnet (4).

8. The hybrid magnetic bearing according to claim 6, characterized in that: The bearing housing (1) is made of non-magnetic material.

9. A magnetic levitation motor, characterized in that: A hybrid magnetic bearing comprising the hybrid magnetic bearing according to any one of claims 1 to 8.

10. A magnetic levitation rotating device, characterized in that: A hybrid magnetic bearing comprising the hybrid magnetic bearing according to any one of claims 1 to 8.

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