Energy storage flywheel

Abstract

The application discloses a kind of energy storage flywheel, the energy storage flywheel includes shell, flywheel rotor and protective bearing assembly, flywheel rotor is located in shell and includes rotor hub and rotor shaft, protective bearing assembly includes protective bearing and memory alloy inner sleeve, protective bearing is connected with the inner wall of shell and surrounds the outer periphery of rotor shaft, protective bearing is spaced apart from rotor shaft in the radial direction of rotor shaft, memory alloy inner sleeve is located on protective bearing, and in normal temperature state, memory alloy inner sleeve is spaced apart from rotor shaft, at least part of memory alloy inner sleeve is in contact with the outer peripheral surface of rotor shaft when heating to critical point.The energy storage flywheel of the application sets memory alloy inner sleeve on the inside of protective bearing, can utilize the characteristics of memory alloy deformation with temperature change, rapidly phase transition protrusion to wrap and support flywheel rotor after flywheel rotor out of control, to realize out of control protection, reduce the contact vibration when flywheel out of control.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage devices, in particular to an energy storage flywheel. BACKGROUND

[0002] In a flywheel energy storage system, a protection bearing is used to provide temporary support when the flywheel rotor is accidentally destabilized, avoiding direct collision between the rotor and the stator. The traditional protection bearing usually adopts a fixed gap design, and when the rotor contacts the protection bearing, the existence of the gap easily leads to vibration, friction heating and even secondary damage. In the related art, some solutions attempt to reduce the gap through elastic materials or hydraulic adjustment mechanisms, but there are problems such as slow response speed, complex structure, poor long-term stability, etc. SUMMARY

[0003] The present application aims to at least partially solve one of the technical problems in the related art.

[0004] To this end, an embodiment of the present application proposes an energy storage flywheel, which is provided with a memory alloy inner sleeve on the inner side of the protection bearing. The memory alloy inner sleeve can utilize the property of the memory alloy that changes shape with temperature, and after the flywheel rotor loses control, it rapidly changes phase and protrudes to wrap and support the flywheel rotor, thereby achieving loss-of-control protection. The deformation of the memory alloy inner sleeve can reduce the collision gap, thereby reducing the contact vibration when the flywheel loses control. Compared with the traditional gap adjustment structure, the memory alloy inner sleeve has fast response and high reliability.

[0005] The energy storage flywheel according to an embodiment of the present application comprises: a housing; a flywheel rotor, which is arranged in the housing and comprises a rotor hub and a rotor shaft; and a protection bearing assembly, which comprises a protection bearing and a memory alloy inner sleeve, the protection bearing is connected with the inner wall of the housing and surrounds the outer periphery of the rotor shaft, the protection bearing is spaced apart from the rotor shaft in the radial direction of the rotor shaft, and the memory alloy inner sleeve is arranged on the protection bearing, and in a normal temperature state, the memory alloy inner sleeve is spaced apart from the rotor shaft, and when heated to a critical point, at least part of the memory alloy inner sleeve is in contact with the outer peripheral surface of the rotor shaft.

[0006] The energy storage flywheel of the embodiment of the application, the flywheel rotor is arranged in the shell and comprises a rotor hub and a rotor shaft, the protection bearing assembly comprises a protection bearing and a memory alloy inner sleeve, the protection bearing is connected with the inner wall of the shell and surrounds the outer periphery of the rotor shaft, the protection bearing is spaced apart from the rotor shaft in the radial direction of the rotor shaft, the memory alloy inner sleeve is arranged on the protection bearing, and in the normal temperature state, the memory alloy inner sleeve is spaced apart from the rotor shaft, and when heated to the critical point, at least part of the memory alloy inner sleeve is in contact with the outer peripheral surface of the rotor shaft, thereby, by arranging the memory alloy inner sleeve on the protection bearing, the characteristic that the memory alloy deforms with temperature change can be utilized, and after the flywheel rotor loses control, the memory alloy inner sleeve rapidly changes phase and protrudes to wrap and support the flywheel rotor, thereby realizing the control protection, and the deformation of the memory alloy inner sleeve can reduce the collision gap, thereby reducing the contact vibration when the flywheel loses control, and compared with the traditional gap adjusting structure, the memory alloy inner sleeve has fast response and high reliability.

[0007] In some embodiments, the memory alloy inner sleeve is arranged in a circumferential direction of the rotor shaft.

[0008] In some embodiments, in the axial direction of the flywheel rotor, the memory alloy inner sleeve comprises an intermediate segment, and the intermediate segment is arranged on the inner peripheral surface of the protection bearing.

[0009] In some embodiments, the memory alloy inner sleeve further comprises an upper limiting segment and a lower limiting segment, the upper limiting segment is connected to the top of the intermediate segment and is bent towards the outside, the lower limiting segment is connected to the bottom of the intermediate segment and is bent towards the outside, and the upper limiting segment and the lower limiting segment are respectively clamped on the top surface and the bottom surface of the protection bearing.

[0010] In some embodiments, the memory alloy inner sleeve comprises an inner sleeve body and a contact protrusion, the inner sleeve body is mounted on the protection bearing and arranged in a circumferential direction of the rotor shaft, the contact protrusion is arranged on the inner peripheral surface of the inner sleeve body, and in the normal temperature state, the contact protrusion is attached to the surface of the inner sleeve body and spaced apart from the rotor shaft, when heated to the phase change critical point, the contact protrusion protrudes towards the rotor shaft, and in the radial direction of the rotor shaft, the protrusion size of the contact protrusion is greater than the spacing size of the rotor shaft and the inner sleeve body.

[0011] In some embodiments, the contact protrusion comprises a plurality of contact protrusions arranged in the circumferential direction of the rotor shaft, and / or the contact protrusion comprises a plurality of contact protrusions arranged in the axial direction of the rotor shaft.

[0012] In some embodiments, in the circumferential direction of the rotor shaft, the width size of the contact protrusion is d, the spacing size of adjacent contact protrusions is H, and 1.5≤H / d≤2 is satisfied.

[0013] In some embodiments, when the temperature is raised to the phase transition critical point, in the radial direction of the rotor shaft, the protruding size of the contact protrusion is s, the spacing size between the rotor shaft and the inner sleeve body is L, and 1.2≤s / L≤1.5 is satisfied.

[0014] In some embodiments, the contact protrusion is a protruding strip extending in a ring shape along the circumference of the rotor shaft, and the protruding strip is in a wave shape structure.

[0015] In some embodiments, the memory alloy inner sleeve is provided with a heat dissipation groove. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a structural schematic diagram of an energy storage flywheel according to an embodiment of the present application.

[0017] Figure 2 is a structural schematic diagram of a memory alloy inner sleeve of an energy storage flywheel according to an embodiment of the present application.

[0018] Figure 3 is a structural schematic diagram of a contact protrusion of a memory alloy inner sleeve of an energy storage flywheel according to an embodiment of the present application, wherein a normal temperature state is shown.

[0019] Figure 4 is a structural schematic diagram of a contact protrusion of a memory alloy inner sleeve of an energy storage flywheel according to an embodiment of the present application, wherein a high temperature state is shown.

[0020] Figure 5 is a structural schematic diagram of a contact protrusion of a memory alloy inner sleeve of an energy storage flywheel according to another embodiment of the present application.

[0021] Figure 6 is a structural schematic diagram of a contact protrusion of a memory alloy inner sleeve of an energy storage flywheel according to an embodiment of the present application, wherein a high temperature state is shown.

[0022] REFERENCE SIGNS:

[0023] Flywheel rotor 1, memory alloy inner sleeve 2, protective bearing 3, fixing seat 4, contact protrusion 5, middle section 6, upper limit position section 7, lower limit position section 8. DETAILED DESCRIPTION

[0024] Embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0025] As shown in Figures 1-6 , the energy storage flywheel of the embodiment of the present application comprises a housing, a flywheel rotor 1 and a protective bearing assembly.

[0026] Specifically, the flywheel rotor 1 is arranged in the housing and comprises a rotor hub and a rotor shaft, the protection bearing assembly comprises a protection bearing 3 and a memory alloy inner sleeve 2, the protection bearing 3 is connected with the inner wall of the housing and surrounds the outer periphery of the rotor shaft, the protection bearing 3 is spaced apart from the rotor shaft in the radial direction of the rotor shaft, the memory alloy inner sleeve 2 is arranged on the protection bearing 3, and in the normal temperature state, the memory alloy inner sleeve 2 is spaced apart from the rotor shaft, and when the temperature is raised to the critical point, at least part of the memory alloy inner sleeve 2 is in contact with the outer peripheral surface of the rotor shaft.

[0027] It can be understood that when the flywheel rotor 1 normally operates under the support of the magnetic bearing, the flywheel rotor 1 is suspended in the middle position, the memory alloy inner sleeve 2 is not in contact with the rotor shaft, and the flywheel rotor 1 is in a normal operating state, when the flywheel rotor 1 is unbalanced due to external factors, the flywheel rotor 1 deviates to cause the rotor shaft to be in contact with the memory alloy inner sleeve 2, a large amount of heat energy is generated due to friction in the instant of contact, the temperature is raised to the critical point of the phase change of the memory alloy inner sleeve 2 in a short time, and then the memory alloy inner sleeve 2 is deformed and protrudes to contact the rotor shaft, so that the rotor shaft of the out-of-control flywheel rotor 1 can be wrapped and supported, and then the flywheel rotor 1 is gradually unloaded under the action of the protection bearing 3.

[0028] Therefore, by arranging the memory alloy inner sleeve 2 on the protection bearing 3, the rotor shaft can be quickly responded, wrapped and supported after the flywheel rotor 1 is out of control, the contact vibration is reduced, meanwhile, the memory alloy inner sleeve 2 can avoid the direct contact between the protection bearing 3 and the flywheel rotor 1, and thus the wear of the protection bearing 3 can be reduced.

[0029] The energy storage flywheel of the embodiment of the application, the flywheel rotor 1 is arranged in the housing and comprises a rotor hub and a rotor shaft, the protection bearing assembly comprises a protection bearing 3 and a memory alloy inner sleeve 2, the protection bearing 3 is connected with the inner wall of the housing and surrounds the outer periphery of the rotor shaft, the protection bearing 3 is spaced apart from the rotor shaft in the radial direction of the rotor shaft, the memory alloy inner sleeve 2 is arranged on the protection bearing 3, and in the normal temperature state, the memory alloy inner sleeve 2 is spaced apart from the rotor shaft, and when the temperature is raised to the critical point, at least part of the memory alloy inner sleeve 2 is in contact with the outer peripheral surface of the rotor shaft, thereby, by arranging the memory alloy inner sleeve 2 on the protection bearing 3, the characteristic that the memory alloy is deformed with the change of temperature can be utilized, the memory alloy inner sleeve 2 is quickly deformed and protruded to wrap and support the flywheel rotor 1 after the flywheel rotor 1 is out of control, and thus the out-of-control protection is realized, and the deformation of the memory alloy inner sleeve 2 can reduce the collision gap, and thus the contact vibration when the flywheel is out of control is reduced, and compared with the traditional gap adjusting structure, the memory alloy inner sleeve 2 has fast response and high reliability.

[0030] In some embodiments, the memory alloy inner sleeve 2 is arranged in a circumferential direction of the rotor shaft. Figure 1 、 Figure 2 and Figure 5As shown, the memory alloy inner sleeve 2 is an annular sleeve structure arranged on the rotor shaft, so that when the flywheel is out of control, the flywheel rotor 1 can offset in any direction to trigger the protection mechanism of the memory alloy inner sleeve 2, and the memory alloy inner sleeve 2 can wrap the entire circumference of the rotor shaft after triggering, and the protection and support effect is better.

[0031] Optionally, the memory alloy inner sleeve 2 can also be divided into a plurality of sub-inner sleeves spaced apart in the circumferential direction of the rotor shaft, which can be selected according to requirements.

[0032] In some embodiments, as shown in Figure 1 In the axial direction of the flywheel rotor 1, the memory alloy inner sleeve 2 includes an intermediate section 6 arranged on the inner circumferential surface of the protection bearing 3. Thus, when the flywheel rotor 1 is out of control, the intermediate section 6 can wrap the rotor shaft from the outer circumference of the rotor shaft, increase the contact area, and improve the reliability of the out-of-control protection.

[0033] In some embodiments, the memory alloy inner sleeve 2 further includes an upper limiting section 7 and a lower limiting section 8, the upper limiting section 7 is connected to the top of the intermediate section 6 and is bent towards the outside, and the lower limiting section 8 is connected to the bottom of the intermediate section 6 and is bent towards the outside, the upper limiting section 7 and the lower limiting section 8 are respectively clamped on the top surface and the bottom surface of the protection bearing 3. As shown in Figure 1 The memory alloy inner sleeve 2 is wrapped on the inner side of the protection bearing 3, and the upper limiting section 7 extends outwardly and is connected to the upper surface of the protection bearing 3, and the lower limiting section 8 extends outwardly and is connected to the lower surface of the protection bearing 3, so that the upper and lower limiting sections can play a role in assembling and limiting, and on the other hand, the upper limiting section 7 can support the rotor hub when the flywheel is out of control, avoiding direct contact between the rotor hub and the upper surface of the protection bearing 3.

[0034] In some embodiments, as shown in Figure 4 and Figure 5 The memory alloy inner sleeve 2 includes an inner sleeve body and a contact protrusion 5, the inner sleeve body is mounted on the protection bearing 3 and arranged around the rotor shaft in the circumferential direction, the contact protrusion 5 is arranged on the inner circumferential surface of the inner sleeve body, and in the normal temperature state, the contact protrusion 5 is attached to the surface of the inner sleeve body and spaced apart from the rotor shaft, when the temperature rises to the phase change critical point, the contact protrusion 5 protrudes towards the rotor shaft, and in the radial direction of the rotor shaft, the protruding size of the contact protrusion 5 is greater than the spacing size between the rotor shaft and the inner sleeve body. Thus, when the flywheel rotor 1 rotates normally, the contact protrusion 5 is attached to the inner sleeve body and does not interfere with the normal rotation of the flywheel rotor 1, and when the flywheel rotor 1 is out of control, the contact protrusion 5 can be deformed and protrude to support the rotor shaft, thereby realizing the out-of-control protection.

[0035] In addition, by constructing the memory alloy inner sleeve 2 as a combined structure of the contact protrusions 5 and the inner sleeve body, the contact protrusions 5 can realize the runaway protection of the flywheel rotor 1 by deforming themselves, and will not interfere with the connection stability of the inner sleeve body and the protection bearing 3.

[0036] In some embodiments, the contact protrusions 5 include a plurality of contact protrusions 5 arranged in the circumferential direction of the rotor shaft, and / or the contact protrusions 5 include a plurality of contact protrusions 5 arranged in the axial direction of the rotor shaft. As shown in Figure 4 As shown in the figure, when the inner sleeve body is unfolded, the plurality of contact protrusions 5 are arranged in a rectangular shape in multiple rows and multiple columns, and the plurality of contact protrusions 5 can completely wrap the rotor shaft in the outer circumference and the axial height of the rotor shaft, thereby improving the reliability of the runaway protection.

[0037] In some embodiments, in the circumferential direction of the rotor shaft, the width dimension of the contact protrusions 5 is d, and the interval dimension of the adjacent contact protrusions 5 is H, and 1.5≤H / d≤2 is satisfied. It can be understood that the layout of the contact protrusions 5 needs to consider the deformation space and the supporting effect on the rotor shaft. When the layout density of the contact protrusions 5 is too small, the supporting and protecting capability is insufficient, and when the layout density is too large, the contact protrusions 5 may interfere with each other when deformed. Based on this, the inventors of the present application have found that when the ratio of the interval of the contact protrusions 5 to the width dimension thereof is between 1.5 and 2, the supporting capability and the deformation space of the contact protrusions 5 can be considered, and the runaway protection effect can be ensured.

[0038] In some embodiments, when the temperature is raised to the phase change critical point, in the radial direction of the rotor shaft, the protruding dimension of the contact protrusions 5 is s, and the interval dimension of the rotor shaft and the inner sleeve body is L, and 1.2≤s / L≤1.5 is satisfied. It should be noted that the protruding height of the contact protrusions 5 needs to consider the supporting degree and the deformation interference when the flywheel is out of control. When the protruding height of the contact protrusions 5 is too small, the contact force between the contact protrusions 5 and the flywheel rotor 1 may be insufficient, thereby resulting in poor supporting effect, and when the protruding height of the contact protrusions 5 is too large, the adjacent contact protrusions 5 may interfere with each other after deformation. Based on this, the inventors of the present application have found that when the ratio of the protruding dimension of the contact protrusions 5 to the interval dimension is between 1.2 and 1.5, the supporting degree and the deformation space of the contact protrusions 5 can be considered.

[0039] In some embodiments, as shown in Figure 5 As shown in the figure, the contact protrusions 5 are protruding strips extending in the axial direction of the rotor shaft, and the protruding strips are in a wave shape. In this way, the wave-shaped contact protrusions 5 can increase the contact area with the rotor shaft, thereby further improving the supporting and wrapping effect.

[0040] Alternatively, the contact protrusions 5 can also be rectangular strip buds.

[0041] In some embodiments, the memory alloy inner sleeve 2 is provided with a heat dissipation groove. In this way, the heat dissipation groove can accelerate the cooling of the memory alloy inner sleeve 2, prolonging the service life of the inner sleeve.

[0042] Optionally, the memory alloy inner sleeve 2 is in interference fit with the protective bearing 3, and the interference amount is 0.05-0.1mm.

[0043] Optionally, the pitch of the strip-shaped bud-shaped contact protrusions 5 is 5mm.

[0044] Optionally, the memory alloy inner sleeve 2 is made of nickel-titanium alloy, and the phase transition temperature is set to 50-80℃.

[0045] Optionally, the shell is provided with a fixing seat 4, and the protective bearing 3 is embedded on the fixing seat 4.

[0046] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0047] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0048] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or in communication with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0049] In the present application, unless specifically stated and limited otherwise, a first feature "on" or "under" a second feature can be directly in contact with the second feature, or indirectly in contact with the second feature through an intermediate medium. Also, a first feature "over", "above" and "on top of" a second feature can be directly above or obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. A first feature "under", "below" and "underneath" a second feature can be directly below or obliquely below the second feature, or simply means that the first feature is horizontally lower than the second feature.

[0050] In the present application, the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" mean that a particular feature, structure, material or characteristic is included in at least one embodiment or example of the present application. In the specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Also, the described specific features, structures, materials or characteristics can be combined in any suitable manner in any one or more embodiments or examples. In addition, different embodiments or examples described in the specification and features of different embodiments or examples can be combined and combined by those skilled in the art without contradiction.

[0051] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary and are not to be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above-described embodiments within the scope of the present application.

Claims

1. An energy storage flywheel, characterized by, The application relates to a flywheel rotor, which comprises a housing, a flywheel rotor arranged in the housing and comprising a rotor hub and a rotor shaft, a protection bearing assembly comprising a protection bearing connected with an inner wall of the housing and surrounding an outer periphery of the rotor shaft, the protection bearing being spaced apart from the rotor shaft in a radial direction of the rotor shaft, and a memory alloy inner sleeve arranged on the protection bearing and spaced apart from the rotor shaft in a normal temperature state, at least part of the memory alloy inner sleeve being in contact with an outer peripheral surface of the rotor shaft when heated to a critical point. The memory alloy inner sleeve is arranged in a circumferential direction of the rotor shaft. In an axial direction of the flywheel rotor, the memory alloy inner sleeve comprises an intermediate section arranged on an inner peripheral surface of the protection bearing. The memory alloy inner sleeve further comprises an upper limiting section and a lower limiting section, the upper limiting section being connected to a top of the intermediate section and bent towards an outer side, and the lower limiting section being connected to a bottom of the intermediate section and bent towards an outer side, the upper limiting section and the lower limiting section being clamped on a top surface and a bottom surface of the protection bearing respectively.

2. The energy storage flywheel of claim 1, wherein, The memory alloy inner sleeve comprises an inner sleeve body and a contact protrusion, the inner sleeve body being arranged in a circumferential direction of the rotor shaft and mounted on the protection bearing, and the contact protrusion being arranged on an inner peripheral surface of the inner sleeve body and attached to a surface of the inner sleeve body and spaced apart from the rotor shaft in a normal temperature state, the contact protrusion protruding towards the rotor shaft when heated to a phase transition critical point, the protruding size of the contact protrusion being greater than the spacing size between the rotor shaft and the inner sleeve body in a radial direction of the rotor shaft.

3. The energy storage flywheel of claim 1, wherein, The contact protrusion comprises a plurality of protrusions arranged in a circumferential direction of the rotor shaft and / or a plurality of protrusions arranged in an axial direction of the rotor shaft.

4. The energy storage flywheel of claim 3, wherein, In a circumferential direction of the rotor shaft, the width size of the contact protrusion is d, and the spacing size of adjacent contact protrusions is H, and 1.5<=H / d<=2 is satisfied.

5. The energy storage flywheel of claim 1, wherein, When heated to a phase transition critical point, in a radial direction of the rotor shaft, the protruding size of the contact protrusion is s, and the spacing size between the rotor shaft and the inner sleeve body is L, and 1.2<=s / L<=1.5 is satisfied.

6. The energy storage flywheel of claim 5, wherein, The contact protrusion is a protruding strip extending in a ring shape in a circumferential direction of the rotor shaft, and the protruding strip is in a wave shape structure.

7. The energy storage flywheel of claim 6, wherein, The memory alloy inner sleeve is provided with a heat dissipation groove.

8. The energy storage flywheel of claim 5, wherein, ​ 9. The energy storage flywheel of claim 5, wherein, ​ 10. The energy storage flywheel of any one of claims 1-9, wherein, ​

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