Hybrid magnetic levitation bearings, magnetic levitation motors, and magnetic levitation rotating devices

Abstract

This invention provides a hybrid magnetic levitation bearing, a magnetic levitation motor, and a magnetic levitation rotating device. The hybrid magnetic levitation bearing includes a bearing housing with a bearing chamber. A radial ring is assembled within the bearing chamber and fitted onto the radial outer peripheral wall of the stator core of the bearing stator assembly. A cooling channel is formed within the radial ring, surrounding its central axis. This cooling channel, through its inlet and outlet, can form a circulating connection with an external cooling source. This invention efficiently absorbs and transfers the heat generated by the stator windings when energized to the outside of the bearing for dissipation, effectively preventing temperature rise in the magnetic levitation bearing, delaying the aging of components such as the stator windings, eliminating safety hazards, reducing magnetic bearing wear, preventing high-temperature demagnetization of permanent magnets, and reducing maintenance costs.

Description

Technical Field

[0001] This invention belongs to the field of magnetic levitation bearing design technology, specifically relating to a hybrid magnetic levitation bearing, a magnetic levitation motor, and a magnetic levitation rotating device. Background Technology

[0002] Magnetic levitation motors are special motors where the stator and rotor operate without contact. They are widely used in refrigeration and industrial fields, such as magnetic levitation air compressors, magnetic levitation blowers, and magnetic levitation centrifugal refrigeration compressors. Magnetic levitation bearings (also known as magnetic bearings) can be divided into active, passive, and hybrid bearings. 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, heat generation is a significant issue. While magnetic levitation bearings used in centrifugal refrigeration compressors can dissipate heat through refrigerant, those used in industrial applications such as magnetic levitation air compressor bearings and magnetic levitation blower bearings lack additional cooling, easily leading to excessive temperature rise, accelerated component aging, increased bearing wear, and 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 related technologies where the lack of an effective cooling structure in the hybrid magnetic levitation bearing leads to excessive temperature rise of the magnetic bearing, accelerated aging of parts, increased magnetic bearing loss, and demagnetization of the permanent magnet.

[0004] To address the aforementioned problems, this invention provides a hybrid magnetic levitation bearing, comprising a bearing housing having a bearing chamber, a radial ring assembled within the bearing chamber, the radial ring being fitted onto the radial outer peripheral wall of the stator core of the bearing stator assembly, and a cooling channel formed within the radial ring and arranged around its central axis, the cooling channel being able to form a circulating connection with an external cooling source through its channel inlet and channel outlet.

[0005] In some embodiments, the flow channel inlet and the flow channel outlet are 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, wherein both the flow channel inlet and the flow channel outlet are 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 that protrudes radially outward, and the bearing housing has a positioning groove on the wall surface that mates with the radial ring that is slidably connected to the positioning protrusion. 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 housing includes a bottom wall perpendicular to the central axis of the radial ring and a ring wall surrounding the central axis of the radial ring, the positioning groove being formed on the ring wall and extending axially along the radial ring to the open end face of the bearing housing; and / or, two positioning protrusions and two positioning grooves are provided respectively.

[0008] In some embodiments, the radial ring has an inner end face that is axially abutted against the bottom wall of the chamber and an outer end face that corresponds to the position of the opening end. A stator assembly hole is formed on the outer end face, and the bearing stator assembly is connected to the stator assembly hole via the stator core. Alternatively, a plurality of magnetic grooves are formed on the inner end face that are spaced around the central axis of the radial ring, and each permanent magnet is correspondingly housed and positioned in each of the magnetic grooves.

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

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

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

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

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

[0014] The hybrid magnetic levitation bearing, magnetic levitation motor, and magnetic levitation rotation device provided by this invention have the following beneficial effects:

[0015] By setting cooling channels inside the radial ring, coolant such as cooling water or cooling oil can circulate within it. Since the radial ring is in direct contact with the stator core inside the bearing stator assembly, it can efficiently absorb and transfer the heat generated by the stator winding when energized to the outside of the bearing for dissipation. This effectively prevents the temperature rise of the magnetic levitation bearing, delays the aging of components such as the stator winding, eliminates safety hazards, reduces magnetic bearing losses, prevents high-temperature demagnetization of permanent magnets, and reduces maintenance costs. Attached Figure Description

[0016] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. The drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

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

[0018] Figure 2 yes Figure 1 Left view of a hybrid magnetic levitation bearing;

[0019] Figure 3 yes Figure 1 Right view of a hybrid magnetic levitation bearing;

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

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

[0022] Figure 6 yes Figure 1 A front view of the bearing housing in the image;

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

[0024] Figure 8 yes Figure 1 A front view of the magnetic ring in the image.

[0025] The attached figures are labeled 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. Magnet slot; 24. Boss; 241. Threaded hole; 25. Stator assembly hole; 31. Stator core; 32. Stator winding; 4. Permanent magnet; 5. Magnetic guide ring; 51. Connecting through hole. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0029] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90° or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0030] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0031] See Figures 1 to 8As shown in the embodiment of the present invention, a hybrid magnetic levitation bearing is provided, including a bearing housing 1, the bearing housing 1 having a bearing chamber 11, a radial ring 2 assembled in the bearing chamber 11, the radial ring 2 being fitted onto the radial outer peripheral wall of the stator core 31 of the bearing stator assembly (not shown in the figure), a stator winding 32 being provided on the stator teeth of the stator core 31, and the suspension position of the shaft of the hybrid magnetic levitation bearing of the present invention being adjusted after current is passed through the stator winding 32, the radial ring 2 having a cooling channel 21 arranged around its central axis, the cooling channel 21 being able to form a circulating connection with an external cooling source through its channel inlet 211 and channel outlet 212, the aforementioned cooling channel 21 being, for example, an annular channel, or a spiral or spiral channel, the aforementioned external cooling source being any structure capable of dissipating the heat absorbed by the heat transfer fluid in the cooling channel 21 outside the bearing, such as a heat exchanger, the heat transfer fluid being cooling water, cooling oil, etc.

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

[0033] Specifically, excessively high temperatures in magnetic bearings can lead to aging of the insulation layer of the magnetic bearing windings. Over time, this can cause cracking of the insulation layer, resulting in faults such as short circuits and grounding, severely impacting the service life of the magnetic bearing. In this invention, the cooling channel 21, located within the radial ring 2, can more efficiently transfer the heat generated by the bearing stator assembly to the outside of the bearing, achieving cooling and effectively preventing excessive temperature rise. Excessively high magnetic bearing temperatures can also cause changes in the internal magnetic field, increasing losses and leading to decreased efficiency of the motor or the entire system, resulting in energy waste. This invention overcomes these shortcomings through the efficient heat dissipation of the cooling channel 21. Furthermore, when the magnetic bearing temperature is too high, the hybrid magnetic bearing contains rare-earth permanent magnets. Excessively high external temperatures can cause these magnets to demagnetize, an irreversible process. The cooling channel 21 in this invention prevents this demagnetization caused by excessively high temperatures.

[0034] To further improve the heat transfer efficiency between the radial ring 2 and the refrigerant in the cooling channel 21, in some embodiments, the cooling channel 21 has fins (not shown in the figure, not indexed) extending radially outward along the radial ring 2 on the channel wall near the stator core 31. Each fin has a flow hole (not shown in the figure). This increases the contact area between the refrigerant and the solid structure of the radial ring 2 in the cooling channel 21, thereby improving the heat absorption capacity of the refrigerant.

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

[0036] In order to ensure that the heat exchange between the refrigerant and the radial ring 2 within 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 refrigerant is introduced into the cooling channel 21 from one end of a diameter of the radial ring 2 to form a circumferential surround 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. 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 holes and have an inner diameter larger than that of the threaded holes.

[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 through the aforementioned first through hole 121 and second through hole 122 respectively, and the pipeline arrangement is reasonable.

[0039] In some embodiments, the radial outer peripheral wall of the radial ring 2 has a positioning protrusion 22 that protrudes outward along its radial direction, and the bearing chamber 11 has a positioning groove 13 that is slidably connected to the positioning protrusion 22 on the wall surface that mates with the radial ring 2. The positioning protrusion 22 can be inserted into the positioning groove 13 along the axial direction of the radial ring 2. It is understood that the position of the positioning protrusion 22 is fixed relative to the flow channel inlet 211 and the flow channel outlet 212, and the position of the positioning groove 13 is fixed relative to 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 be ensured 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 bottom wall (not shown) perpendicular to the central axis of the radial ring 2 and a ring wall (not shown) surrounding the central axis of the radial ring 2, wherein the positioning groove 13 is formed on the 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 its open end face, it can indicate the position adjustment of the operator during the assembly process of the radial ring 2 and the bearing housing 1, making the assembly process more convenient.

[0042] In some embodiments, two positioning protrusions 22 and two positioning grooves 13 are provided respectively. As a preferred implementation, the two positioning protrusions 22 are symmetrical about the geometric center of the radial ring 2. It is understood that the sliding insertion between the positioning protrusions 22 and the positioning grooves 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 face that is axially abutted (i.e., stops) against the bottom wall of the chamber and an outer end face corresponding to the position of the opening end. A stator assembly hole 25 is formed on the outer end face, and the bearing stator assembly is connected to the stator assembly hole 25 via the stator core 31. A plurality of magnetic grooves 23 are formed on the inner end face, spaced around the central axis of the radial ring 2, and each permanent magnet 4 is correspondingly housed and positioned in each of the magnetic grooves 23. In one specific embodiment, the aforementioned permanent magnet 4 is a fan-shaped ring.

[0044] In this technical solution, a magnetic groove 23 is provided on the inner end face of the radial ring 2 that mates with the bottom wall of the chamber. Each permanent magnet 4 is assembled one-to-one into the magnetic groove 23. The bottom wall of the chamber can form an axial stop for each permanent magnet 4. At the same time, the bearing stator assembly is located at the opening of the bearing chamber 11, which has a large open surface, which is conducive to heat dissipation of the stator winding 32. For example, if the corresponding equipment is also equipped with a cooling fan, the airflow generated by the cooling fan can 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 groove 23 is directly constructed on the inner end face to form a circumferential limit for each permanent magnet 4, eliminating the need for the magnetic fixing frame in the prior art, simplifying the assembly process and improving assembly efficiency.

[0045] In some embodiments, the inner end face has a plurality of bosses 24 that protrude axially along the radial ring 2, and a magnetic groove 23 is formed between two adjacent bosses 24. The hybrid magnetic levitation bearing also includes a magnetic guide ring 5, which is detachably connected to the boss end face of each boss 24. Specifically, the aforementioned magnetic guide ring 5 may be provided with corresponding connecting through holes 51, and the bosses 24 are provided with corresponding threaded holes 241 at positions corresponding to each connecting through hole 51, so that the detachable connection between the magnetic guide ring 5 and the radial ring 2 can be achieved by using screws.

[0046] In this technical solution, the aforementioned magnetic guide ring 5 can guide the magnetic circuit of the permanent magnet 4 to ensure the working performance of the bearing. At the same time, the magnetic guide ring 5 connected to each boss 24 can ensure the axial reliable positioning of each permanent magnet 4 and reduce the machining 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 ring 5 reliably fixes the axial position of each permanent magnet 4.

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

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

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

[0051] It will be readily understood by those skilled in the art that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0052] The above description is merely 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 principles of the present invention should be included within the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. A hybrid magnetic bearing, characterized in that, The application relates to a bearing housing (1) which has a bearing chamber (11) and a radial ring (2) assembled in the bearing chamber (11), the radial ring (2) is sleeved on a radial outer wall of a stator core (31) of a bearing stator assembly, a cooling flow channel (21) is formed in the radial ring (2) and arranged around a central axis of the radial ring (2), the cooling flow channel (21) is one of an annular flow channel, a spiral flow channel or a helical flow channel, the cooling flow channel (21) can be connected with an external cooling source in circulation through a flow channel inlet (211) and a flow channel outlet (212) thereof; the flow channel inlet (211) and the flow channel outlet (212) are respectively arranged on two radially opposite sides of the radial ring (2); the bearing housing (1) is provided with 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), the flow channel inlet (211) and the flow channel outlet (212) are threaded holes extending along the radial direction of the radial ring (2); the radial outer wall of the radial ring (2) is provided with a positioning protrusion (22) protruding outward in the radial direction, and the wall surface of the bearing chamber (11) matched with the radial ring (2) is provided with a positioning groove (13) in sliding connection with 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) to 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).

2. The hybrid magnetic bearing of claim 1, wherein, The radial ring (2) is injection molded.

3. The hybrid magnetic bearing of claim 2, wherein, 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 to the opening end surface of the bearing chamber (11) along the axial direction of the radial ring (2); and / or, the positioning protrusion (22) and the positioning groove (13) are respectively provided with two.

4. The hybrid magnetic bearing of claim 3, wherein, The radial ring (2) has an inner end surface in axial abutting connection with the chamber bottom wall and an outer end surface corresponding to the opening end position, the outer end surface is provided with a stator assembly hole (25), the bearing stator assembly is connected in the stator assembly hole (25) through the stator core (31), and / or the inner end surface is provided with a plurality of magnetic steel grooves (23) arranged around the central axis of the radial ring (2) at intervals, each permanent magnet (4) is correspondingly arranged in each magnetic steel groove (23).

5. The hybrid magnetic bearing of claim 4, wherein, The inner end surface is provided with a plurality of bosses (24) protruding in the axial direction of the radial ring (2), the magnetic steel groove (23) is formed between two adjacent bosses (24), and the hybrid magnetic suspension bearing further comprises a magnetic conductive ring (5) detachably connected to the boss end surface of each boss (24).

6. The hybrid magnetic bearing of claim 5, wherein, The axial protrusion height of the boss (24) is not greater than the axial thickness of the permanent magnet (4).

7. The hybrid magnetic bearing of claim 5, wherein, The bearing housing (1) is made of a non-magnetic material.

8. A magnetic levitation motor, characterized by, The hybrid magnetic bearing according to any one of claims 1 to 7.

9. A magnetic levitation rotating apparatus characterized by comprising: The hybrid magnetic bearing according to any one of claims 1 to 7.

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