Radial-axial integrated magnetic bearing for energy storage device and energy storage device

Abstract

The present invention discloses a radial-axial integrated magnetic bearing and energy storage device for energy storage equipment, wherein the radial-axial integrated magnetic bearing comprises a bearing rotor and a bearing stator, wherein the axis of the bearing rotor extends in the up-down direction, the lower end of the bearing rotor is provided with an annular rotor magnet extending in the circumferential direction of the bearing rotor, the bearing stator is located at the lower end of the bearing rotor, the upper end surface of the bearing stator has a groove, the wall surface of the groove is provided with an annular stator magnet extending in the circumferential direction of the bearing rotor, at least part of the annular stator magnet is opposite to the annular rotor magnet in the up-down direction and is located below the annular rotor magnet, and at least part of the annular stator magnet is opposite to the annular rotor magnet in the radial direction of the bearing rotor, and the annular rotor magnet and the annular stator magnet repel each other. The radial-axial integrated magnetic bearing for energy storage equipment of the present invention has the functions of both radial magnetic bearings and axial magnetic bearings, can reduce the number of magnetic bearings in energy storage equipment, reduce costs, and save space.

Description

Technical Field

[0001] The present invention relates to the technical field of bearings, and in particular to a radial-axial integrated magnetic bearing for energy storage equipment and an energy storage equipment. Background Art

[0002] Magnetic bearings are a new type of high-performance bearings. There is no mechanical contact in magnetic bearings, and the rotor can reach a very high operating speed. It has the advantages of low mechanical wear, low energy consumption, low noise, long life, no lubrication, and no oil pollution. It is particularly suitable for special environments such as high speed, vacuum, and ultra-clean. It can be widely used in mechanical processing, turbomachinery, aerospace, vacuum technology, rotor dynamics characteristics identification and testing, and other fields. It is recognized as a very promising new type of bearing. The magnetic bearings in related technologies have the problems of single functionality and unreasonable structure. When used in energy storage devices, the number of magnetic bearings required is large, the installation space is large, the cost is high, and the disassembly and assembly with the energy storage equipment is complicated. Summary of the invention

[0003] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0004] To this end, an embodiment of the present invention proposes a radial-axial integrated magnetic bearing for an energy storage device. The radial-axial integrated magnetic bearing for the energy storage device has the functions of both a radial magnetic bearing and an axial magnetic bearing, which can reduce the number of magnetic bearings in the energy storage device, reduce costs, facilitate disassembly and assembly, and save installation space.

[0005] An embodiment of the present invention further provides an energy storage device.

[0006] According to an embodiment of the present invention, a radial-axial integrated magnetic bearing for an energy storage device includes: a bearing rotor, the axis of the bearing rotor extends in the up-down direction, and the lower end of the bearing rotor is provided with an annular rotor magnet extending in the circumferential direction of the bearing rotor; a bearing stator, the bearing stator is located at the lower end of the bearing rotor, the upper end surface of the bearing stator has a groove, the lower end of the bearing rotor is fitted in the groove, and the wall surface of the groove is provided with an annular stator magnet extending in the circumferential direction of the bearing rotor, at least part of the annular stator magnet is opposite to the annular rotor magnet in the up-down direction and is located below the annular rotor magnet, and at least part of the annular stator magnet is opposite to the annular rotor magnet in the radial direction of the bearing rotor, and the annular rotor magnet and the annular stator magnet repel each other.

[0007] In the embodiment of the present invention, the radial-axial integrated magnetic bearing for energy storage equipment is provided with an annular rotor magnet on the bearing rotor, and the annular stator magnet on the bearing stator, and at least part of the annular stator magnet is opposite to the annular rotor magnet in the vertical direction, and at least part of the annular stator magnet is opposite to the annular rotor magnet in the radial direction of the bearing rotor, so that the annular stator magnet and the annular rotor magnet can generate a magnetic repulsion in the vertical direction that can balance the gravity of the energy storage device rotor and the bearing rotor, and can generate a relatively balanced magnetic repulsion in the radial direction of the bearing rotor, so as to achieve the purpose that a single radial-axial integrated magnetic bearing for energy storage equipment of the present application can simultaneously replace the radial magnetic bearing and the axial magnetic bearing, that is, the radial-axial integrated magnetic bearing for energy storage equipment of the present application has various functions, can reduce the number of magnetic bearings in the energy storage equipment, reduce costs, facilitate disassembly and assembly, and save installation space. In addition, the magnetic force generated by the magnetic steel of the present application does not require the setting of a control system compared with electromagnets, which further reduces costs.

[0008] In some embodiments, the annular rotor magnet extends obliquely inward from top to bottom, and the annular stator magnet extends obliquely inward from top to bottom, and the annular rotor magnet is located above the annular stator magnet.

[0009] In some embodiments, the lower end of the bearing rotor has a conical section, and the conical section fits in the groove. The outer circumferential surface of the conical section is an inclined surface extending inward from top to bottom, and the circumferential surface of the groove is an inclined surface extending inward from top to bottom. The outer circumferential surface of the conical section and the circumferential surface of the groove are relative and spaced apart in a first direction, and the first direction is perpendicular to the outer circumferential surface of the conical section. The annular rotor magnetic steel ring is arranged on the outer circumferential surface of the conical section, and the annular stator magnetic steel ring is arranged on the circumferential surface of the groove.

[0010] In some embodiments, the annular rotor magnetic steel is directly opposite to the annular stator magnetic steel in the first direction.

[0011] In some embodiments, a first annular mating groove extending along its circumferential direction is provided on the outer circumferential surface of the conical section, and the annular rotor magnet is fitted in the first annular mating groove. A second annular mating groove extending along its circumferential direction is provided on the circumferential surface of the groove, and the annular stator magnet is fitted in the second annular mating groove.

[0012] In some embodiments, the radial-axial integrated magnetic bearing for energy storage equipment also includes a stator magnetic steel sleeve and a rotor magnetic steel sleeve, the rotor magnetic steel sleeve extends along the circumference of the bearing rotor and fits in the first annular fitting groove, the annular rotor magnet fits in the rotor magnetic steel sleeve, and the stator magnetic steel sleeve extends along the circumference of the bearing rotor and fits in the second annular fitting groove.

[0013] In some embodiments, the radial-axial integrated magnetic bearing for energy storage equipment also includes a rotor pressure ring and a stator pressure ring, the rotor pressure ring is detachably connected to the conical section, and the rotor pressure ring can stop against the rotor magnetic steel sleeve to compress the rotor magnetic steel sleeve, the stator pressure ring is detachably connected to the bearing stator, and the stator pressure ring can stop against the stator magnetic steel sleeve to compress the stator magnetic steel sleeve.

[0014] In some embodiments, the rotor pressure ring is disposed at the bottom of the conical section, and the stator pressure ring is disposed at the top of the bearing stator.

[0015] In some embodiments, the radial-axial integrated magnetic bearing for energy storage equipment also includes a protective bearing, a boss protruding toward the conical section is provided on the bottom surface of the groove, the upper end of the boss is engaged in the annular hole of the rotor pressure ring, the protective bearing is sleeved on the upper end of the boss, and the protective bearing and the rotor pressure ring are spaced apart in the radial direction of the bearing rotor.

[0016] The energy storage device of the present invention includes the radial-axial integrated magnetic bearing for energy storage device described in any of the above embodiments.

[0017] The energy storage device of the embodiment of the present invention adopts the radial-axial integrated magnetic bearing for energy storage device, so the energy storage device has a simple structure and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of a radial-axial integrated magnetic bearing for energy storage equipment according to an embodiment of the present invention.

[0019] Reference numerals:

[0020] Bearing rotor 1, conical section 11, bearing stator 2, groove 21, annular rotor magnet 3, rotor magnet sleeve 4, rotor pressure ring 5, annular stator magnet 6, stator magnet sleeve 7, stator pressure ring 8, boss 9, and protective bearing 10. DETAILED DESCRIPTION

[0021] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0022] like Figure 1As shown, the radial-axial integrated magnetic bearing for energy storage equipment of the present invention comprises a bearing rotor 1 and a bearing stator 2. It should be noted that the radial-axial integrated magnetic bearing for energy storage equipment of the present application can be applied to energy storage equipment, drive equipment and other equipment that requires shaft transmission, and the radial-axial integrated magnetic bearing for energy storage equipment of the present application is used to support a vertically arranged rotor, the bearing rotor 1 is suitable for connection with the rotor of the energy storage equipment, and the bearing stator 2 is suitable for connection with the stator of the energy storage equipment.

[0023] Specifically, Figure 1 As shown, the axis of the bearing rotor 1 extends in the up-down direction, the lower end of the bearing rotor 1 is provided with an annular rotor magnet 3 extending in the circumferential direction of the bearing rotor 1, the bearing stator 2 is located at the lower end of the bearing rotor 1, the bearing stator 2 has a groove 21, the lower end of the bearing rotor 1 is fitted in the groove 21, and an annular stator magnet 6 extending in the circumferential direction of the bearing rotor 1 is provided on the inner wall surface of the groove 21, at least part of the annular stator magnet 6 is opposite to the annular rotor magnet 3 in the up-down direction and is located below the annular rotor magnet 3, and at least part of the annular stator magnet is opposite to the annular rotor magnet 3 in the radial direction of the bearing rotor 1, and the annular rotor magnet 3 and the annular stator magnet 6 repel each other.

[0024] It can be understood that when the bearing rotor 1 is arranged vertically, the bearing rotor 1 itself has gravity, and the part of the annular stator magnet 6 opposite to the annular rotor magnet 3 in the up and down directions can repel the annular rotor magnet 3 to balance the gravity of the bearing rotor 1 and the energy storage device rotor, so that the energy storage device rotor remains balanced in its axial direction, that is, the radial-axial integrated magnetic bearing of the present application has the function of an axial magnetic bearing.

[0025] Furthermore, the portion of the annular stator magnet 6 that is opposite to the annular rotor magnet 3 in the radial direction of the bearing rotor 1 can repel the annular rotor magnet 3 to form a relatively balanced force in the circumferential direction of the bearing rotor 1 to support the rotor of the energy storage device. It can be understood that when the energy storage device rotor has a tendency to deflect, the side-deflected energy storage device rotor will drive the bearing rotor to deflect sideways, and the repulsive force between the annular rotor magnet 3 and the annular stator magnet 6 in the side-deflected direction increases, thereby preventing the energy storage device rotor from deflecting, that is, the radial-axial integrated magnetic bearing of the present application also has the function of a radial magnetic bearing.

[0026] The inventors have discovered that the magnetic bearings commonly used in the relevant technology include radial magnetic bearings and axial magnetic bearings. When applied to equipment, radial magnetic bearings and axial magnetic bearings are separately arranged to support and balance the rotor in the radial and axial directions of the equipment rotor. However, the above method requires a large number of magnetic bearings, which leads to the problems of large installation space, high cost, and cumbersome installation.

[0027] The bearing rotor 1 of the present application is provided with an annular rotor magnet 3, and the bearing stator 2 is provided with an annular stator magnet 6, and the annular rotor magnet 3 and the annular stator magnet 6 have magnetic repulsion in the up and down directions and magnetic repulsion in the radial direction, that is, the radial-axial integrated magnetic bearing of the present application has the functions of both radial magnetic bearings and axial magnetic bearings, thereby reducing the number of magnetic bearings in actual applications of energy storage devices. In other words, the radial-axial integrated magnetic bearing of the present application can replace radial magnetic bearings and axial magnetic bearings.

[0028] In the embodiment of the present invention, the radial-axial integrated magnetic bearing for energy storage equipment is provided with an annular rotor magnet on the bearing rotor, and the annular stator magnet is provided on the bearing stator, and at least part of the annular stator magnet is opposite to the annular rotor magnet in the up and down direction, and at least part of the annular stator magnet is opposite to the annular rotor magnet in the radial direction of the bearing rotor. Thus, the annular stator magnet and the annular rotor magnet can generate a magnetic repulsion in the up and down direction that can balance the gravity of the energy storage device rotor and the bearing rotor, and can generate a relatively balanced magnetic repulsion in the radial direction of the bearing rotor, so as to achieve the purpose that a single radial-axial integrated magnetic bearing of the present application can simultaneously replace the radial magnetic bearing and the axial magnetic bearing, that is, the radial-axial integrated magnetic bearing for energy storage equipment of the present application is versatile, can reduce the number of magnetic bearings in the energy storage device, reduce costs, facilitate disassembly and assembly, and save installation space. In addition, the use of magnetic steel to generate magnetic force in the present application does not require the setting of a control system compared to electromagnets, which further reduces costs.

[0029] Preferably, if Figure 1 As shown, the annular rotor magnetic steel 3 extends obliquely inward from top to bottom, and the annular stator magnetic steel 6 extends obliquely inward from top to bottom, and the annular rotor magnetic steel 3 is located above the annular stator magnetic steel 6. Therefore, the magnetic repulsion between the annular stator magnetic steel 6 and the annular rotor magnetic steel 3 is directed obliquely upward, and the magnetic repulsion has a vertical component for balancing gravity, and a horizontal component for forming a balance in the radial direction of the rotor.

[0030] Furthermore, if Figure 1 As shown, the lower end of the bearing rotor 1 has a conical section 11, and the conical section 11 is fitted in the groove 21. The outer circumferential surface of the conical section 11 is an inclined surface extending inwardly from top to bottom, and the circumferential surface of the groove 21 is an inclined surface extending inwardly from top to bottom. The outer circumferential surface of the conical section 11 and the circumferential surface of the groove 21 are opposite and spaced apart in a first direction, and the first direction is perpendicular to the outer circumferential surface of the conical section 11. The annular rotor magnet 3 is arranged on the outer circumferential surface of the conical section 11, and the annular stator magnet 6 is arranged on the circumferential surface of the groove 21.

[0031] In other words, the outer circumferential surface of the conical segment 11 and the circumferential surface of the groove 21 are opposite and inclined surfaces, so as to facilitate stable assembly of the inclined annular rotor magnet 3 and the annular stator magnet 6.

[0032] Preferably, if Figure 1 As shown, the annular rotor magnetic steel 3 is directly opposite to the annular stator magnetic steel 6 in the first direction.

[0033] Furthermore, if Figure 1 As shown, a first annular matching groove extending along its circumferential direction is provided on the outer circumferential surface of the conical section 11, and the annular rotor magnet 3 is fitted in the first annular matching groove. A second annular matching groove extending along its circumferential direction is provided on the circumferential surface of the groove 21, and the annular stator magnet 6 is fitted in the second annular matching groove.

[0034] Furthermore, if Figure 1 As shown, the radial-axial integrated magnetic bearing for energy storage equipment also includes a stator magnetic steel sleeve 7 and a rotor magnetic steel sleeve 4. The rotor magnetic steel sleeve 4 extends along the circumference of the bearing rotor 1 and fits in the first annular matching groove. The annular rotor magnetic steel 3 fits in the rotor magnetic steel sleeve 4. The stator magnetic steel sleeve 7 extends along the circumference of the bearing rotor 1 and fits in the second annular matching groove. As a result, the stator magnetic steel sleeve 7 and the rotor magnetic steel sleeve 4 can conveniently accommodate the annular stator magnetic steel 6 and the annular rotor magnetic steel 3, so as to facilitate the overall disassembly and assembly of the magnetic steel, and the matching groove for accommodating the magnetic steel sleeve is conducive to the precise assembly of the magnetic steel sleeve, and there is no need to set up complex connectors, and the structure is simple.

[0035] Furthermore, if Figure 1 As shown, the radial-axial integrated magnetic bearing for energy storage equipment also includes a rotor pressure ring 5 and a stator pressure ring 8. The rotor pressure ring 5 is detachably connected to the conical section 11, and the rotor pressure ring 5 can stop against the rotor magnetic steel sleeve 4 to press the rotor magnetic steel sleeve 4. The stator pressure ring 8 is detachably connected to the bearing stator 2, and the stator pressure ring can stop against the stator magnetic steel sleeve 7 to press the stator magnetic steel sleeve 7.

[0036] Specifically, the rotor pressure ring 5 is arranged at the bottom of the conical section 11, and the stator pressure ring 8 is arranged at the top of the bearing stator 2. Figure 1 As shown, the first annular matching groove is formed at the bottom of the conical section 11 and is open toward the bearing stator 2, the second annular matching groove is formed at the top of the bearing stator 2 and is open toward the bearing rotor 1, the stator pressure ring 8 disposed at the top of the bearing stator 2 can press the upper end of the stator magnetic steel sleeve 7 to press the stator magnetic steel sleeve 7 tightly into the second annular matching groove, and the rotor pressure ring 5 disposed at the bottom of the conical section 11 can press the lower end of the rotor magnetic steel sleeve 4 to press the rotor magnetic steel sleeve 4 tightly into the first annular matching groove. Thus, the stator pressure ring 8 can prevent the annular stator magnetic steel 6 from shaking, and the rotor pressure ring 5 can prevent the annular rotor magnetic steel 3 from shaking.

[0037] Furthermore, if Figure 1As shown, the radial-axial integrated magnetic bearing for energy storage equipment also includes a protective bearing 10, a boss 9 protruding toward the conical section 11 is provided on the bottom surface of the groove 21, the upper end of the boss 9 is fitted in the annular hole of the rotor pressure ring 5, the protective bearing 10 is sleeved on the upper end of the boss 9, and the protective bearing 10 and the rotor pressure ring 5 are spaced apart in the radial direction of the bearing rotor 1. As a result, the protective bearing 10 can be used as a mechanical bearing to maintain the rotation of the rotor when the annular rotor magnet 3 and the annular stator magnet 6 fail, the boss 9 can be used as a support shaft for the protective bearing 10, and the protective bearing 10 can rotate relative to the boss 9. Specifically, when the bearing rotor 1 deflects in the radial direction, the protective bearing 10 can stop against the rotor pressure ring 5, and the rotor pressure ring 5 can drive the protective bearing 10 to rotate around the boss 9.

[0038] The energy storage device of the embodiment of the present invention includes the radial-axial integrated magnetic bearing for energy storage device described in the above embodiment.

[0039] The energy storage device of the embodiment of the present invention adopts the radial-axial integrated magnetic bearing for energy storage device, so the energy storage device has a simple structure and low cost.

[0040] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0041] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0042] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0044] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0045] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A radial-axial integrated magnetic bearing for energy storage equipment, characterized in that: include: A bearing rotor, wherein the axis of the bearing rotor extends in the up-down direction, and the lower end of the bearing rotor is provided with an annular rotor magnet extending in the circumferential direction of the bearing rotor; A bearing stator, wherein the bearing stator is located at the lower end of the bearing rotor, the upper end surface of the bearing stator has a groove, the lower end of the bearing rotor fits in the groove, an annular stator magnet extending along the circumferential direction of the bearing rotor is provided on the wall surface of the groove, at least part of the annular stator magnet is opposite to the annular rotor magnet in the up and down direction and is located below the annular rotor magnet, and at least part of the annular stator magnet is opposite to the annular rotor magnet in the radial direction of the bearing rotor, the annular rotor magnet and the annular stator magnet repel each other, and the lower end of the bearing rotor has a tapered section, the tapered section fits in the groove, and the tapered section A first annular matching groove extending along its circumferential direction is provided on the outer circumferential surface, the annular rotor magnetic steel is matched in the first annular matching groove, a second annular matching groove extending along its circumferential direction is provided on the circumferential surface of the groove, the annular stator magnetic steel is matched in the second annular matching groove, the outer circumferential surface of the conical section is an inclined surface extending inwardly from top to bottom, the circumferential surface of the groove is an inclined surface extending inwardly from top to bottom, the outer circumferential surface of the conical section and the circumferential surface of the groove are opposite and spaced apart in a first direction, the first direction is perpendicular to the outer circumferential surface of the conical section, the annular rotor magnetic steel ring is provided on the outer circumferential surface of the conical section, and the annular stator magnetic steel ring is provided on the circumferential surface of the groove; A stator magnetic steel sleeve and a rotor magnetic steel sleeve, wherein the rotor magnetic steel sleeve extends along the circumferential direction of the bearing rotor and fits in the first annular matching groove, the annular rotor magnetic steel fits in the rotor magnetic steel sleeve, and the stator magnetic steel sleeve extends along the circumferential direction of the bearing rotor and fits in the second annular matching groove; A rotor pressure ring and a stator pressure ring, wherein the rotor pressure ring is detachably connected to the conical section, and the rotor pressure ring can stop against the rotor magnetic steel sleeve to compress the rotor magnetic steel sleeve, the stator pressure ring is detachably connected to the bearing stator, and the stator pressure ring can stop against the stator magnetic steel sleeve to compress the stator magnetic steel sleeve, the rotor pressure ring is arranged at the bottom of the conical section, and the stator pressure ring is arranged at the top of the bearing stator; A protective bearing, wherein a boss protruding toward the conical section is provided on the bottom surface of the groove, and the upper end of the boss is fitted in the annular hole of the rotor pressure ring. The protective bearing is sleeved on the upper end of the boss, and the protective bearing and the rotor pressure ring are spaced apart in the radial direction of the bearing rotor.

2. The radial-axial integrated magnetic bearing for energy storage equipment according to claim 1, characterized in that: The annular rotor magnetic steel extends obliquely inward from top to bottom, and the annular stator magnetic steel extends obliquely inward from top to bottom, and the annular rotor magnetic steel is located above the annular stator magnetic steel.

3. The radial-axial integrated magnetic bearing for energy storage equipment according to claim 1, characterized in that: The annular rotor magnetic steel is directly opposite to the annular stator magnetic steel in the first direction.

4. An energy storage device, characterized in that: It comprises a radial-axial integrated magnetic bearing for an energy storage device according to any one of claims 1-3.

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