CN119561303B - Inertia adjustable flywheel energy storage device - Google Patents

Abstract

The application relates to an inertia-adjustable flywheel energy storage device, which can solve the problems of unadjustable inertia of a flywheel and single application scene in the prior art. The inertia adjustable flywheel energy storage device comprises a shell, a main flywheel, a flywheel matching block, a power source and a power source, wherein the shell is provided with a cavity, at least part of the rotating shaft is arranged in the cavity, the main flywheel is arranged in the cavity and connected with the rotating shaft, the flywheel matching block is detachably connected with the main flywheel, the power source is connected with the rotating shaft, and the power source is used for driving the rotating shaft to rotate, so that the rotating shaft drives the main flywheel and the flywheel matching block to rotate. According to the scheme, the flywheel blocks are detachably connected to the main flywheel, so that the flywheel energy storage device with adjustable inertia can adaptively adjust the quantity of the flywheel blocks according to comprehensive consideration of energy storage energy and response speed, so that a proper balance point of the energy storage energy and the response speed is achieved, inertia adjustment of the flywheel energy storage device with adjustable inertia is realized, and an application scene is widened.

Description

Flywheel energy storage device with adjustable inertia

Technical Field

The application relates to the technical field of energy storage devices, in particular to an inertia-adjustable flywheel energy storage device.

Background

With the development of energy storage technology, an energy storage device with a motor and a flywheel is formed, and the mutual conversion and storage between electric energy and the mechanical kinetic energy of the flywheel running at a high speed are realized. Where a flywheel with a greater inertia is able to store more energy and release more energy when needed, but this may also result in a slower system response speed. In contrast, the flywheel with smaller inertia stores less energy, but has faster response speed, and is more suitable for application scenes requiring quick response. However, in the related art, most of the flywheel energy storage devices currently have solid cylindrical structures, which have non-adjustable inertia and single application scenes.

Disclosure of Invention

Based on the above, it is necessary to provide an inertia-adjustable flywheel energy storage device for solving the problem that the inertia of the flywheel is not adjustable and the application scene is single in the related art.

An inertia tunable flywheel energy storage device, the inertia tunable flywheel energy storage device comprising:

A housing having a cavity;

the rotating shaft is at least partially structurally arranged in the cavity;

The main flywheel is arranged in the cavity and is connected with the rotating shaft;

the flywheel matching block is detachably connected with the main flywheel;

The power source is connected with the rotating shaft and used for driving the rotating shaft to rotate, so that the rotating shaft drives the main flywheel and the flywheel matching block to rotate.

In one embodiment, the main flywheel comprises a side wall and a bottom wall which are connected, the axis of the rotating shaft and the plane of the bottom wall are perpendicular to each other, the rotating shaft is connected to the center of the bottom wall in the direction of the plane, and the side wall and the bottom wall enclose and form a cavity for detachably connecting the flywheel matching block.

In one embodiment, the flywheel matching block is provided with a perforation, the flywheel matching block is detachably arranged on the rotating shaft in a penetrating way, and when the number of the flywheel matching blocks is at least 2, the flywheel matching blocks are stacked in the cavity.

In one embodiment, the inertia adjustable flywheel energy storage device includes a fixing structure, the fixing structure is movably connected to the rotating shaft, and when each flywheel matching block is stacked in the cavity, the fixing structure is pressed against the flywheel matching block located at the uppermost layer along the axis direction of the rotating shaft.

In one embodiment, the inertia adjustable flywheel energy storage device is further provided with a limiting structure, and the limiting structure is used for limiting each flywheel matching block in the cavity so as to limit each flywheel matching block to rotate around the rotating shaft relative to the side wall.

In one embodiment, the casing has an opening communicating with the cavity, the rotating shaft has a first end and a second end, the first end is disposed through the opening and is rotationally connected to a side, away from the opening, of the casing in the cavity, and the second end is disposed through the opening and is connected to the power source.

In one embodiment, the power source has an output end, and the second end is detachably connected to the output end.

In one embodiment, the rotating shaft is disposed in the cavity, two ends of the rotating shaft are respectively connected to two opposite sides of the casing in a rotating manner, and the power source is disposed in the cavity and connected with the rotating shaft.

In one embodiment, the cavity is sealed and evacuated.

In one embodiment, the casing includes a casing body, a first end cover and a second end cover, the casing body has the cavity, and communicates the first opening and the second opening of cavity, the first end cover and the second end cover detachably connect respectively in the both sides of casing body in order to cover first opening and the second opening, the first end cover and the second end cover are connected with first magnetic bearing and second magnetic bearing respectively, the pivot be suspended support in first magnetic bearing and second magnetic bearing.

According to the inertia adjustable flywheel energy storage device, the flywheel blocks are detachably connected to the main flywheel, so that the inertia adjustable flywheel energy storage device and the flywheel energy storage system can adaptively adjust the quantity of the flywheel blocks according to comprehensive consideration of energy storage energy and response speed, so that a proper balance point of the energy storage energy and the response speed is achieved, inertia adjustment of the inertia adjustable flywheel energy storage device is achieved, and an application scene is widened.

Drawings

FIG. 1 is a cross-sectional view of the structure of an inertia adjustable flywheel energy storage device in an embodiment of the application.

FIG. 2 is an exploded view of an inertia tunable flywheel energy storage device in accordance with an embodiment of the present application.

Fig. 3 is a cross-sectional view of an inertia tunable flywheel energy storage device in another embodiment of the application.

Fig. 4 is a schematic diagram of a portion of the inertia adjustable flywheel energy storage device shown in fig. 1.

Fig. 5 is a schematic view of a part of a flywheel energy storage device with adjustable inertia according to another embodiment of the application.

Fig. 6 is a schematic view of a part of a flywheel energy storage device with adjustable inertia according to another embodiment of the application.

Description of the reference numerals

10. The inertia adjustable flywheel energy storage device comprises 11, a shell, 11a, an opening, 111, a shell body, 112, a first end cover, 113, a second end cover, 111a, a cavity, 111b, a first opening, 111c, a second opening, 1121, a first magnetic bearing, 1131, a second magnetic bearing, 12, a rotating shaft, 12a, an axis, 121, a first end, 122, a second end, 13, a main flywheel, 131, a side wall, 132, a bottom wall, 13a, a cavity, 14, a flywheel matching block, 15, a power source, 151, an output end, 16, a fixed structure, 17 and a coupler.

Detailed Description

In order that the above objects, features and advantages of the application will be readily understood, a more particular description of the application will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. The present application may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the application, whereby the application is not limited to the specific embodiments disclosed below.

In the description of the present application, it should be understood that, if any, these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., are used herein with respect to the orientation or positional relationship shown in the drawings, these terms refer to the orientation or positional relationship for convenience of description and simplicity of description only, and do not indicate or imply that the apparatus or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the application.

Furthermore, the terms "first," "second," and the like, if any, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the terms "plurality" and "a plurality" if any, mean at least two, such as two, three, etc., unless specifically defined otherwise.

In the present application, unless explicitly stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly. For example, they may be fixedly connected, detachably connected or integrally formed, mechanically connected, electrically connected, directly connected or indirectly connected through an intermediate medium, and communicated between two elements or the interaction relationship between two elements unless clearly defined otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present application, unless expressly stated or limited otherwise, the meaning of a first feature being "on" or "off" a second feature, and the like, is that the first and second features are either in direct contact or in indirect contact through an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that if an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. If an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein, if any, are for descriptive purposes only and do not represent a unique embodiment.

Considering that most of the flywheels of the existing inertia-adjustable flywheel energy storage devices are solid cylindrical structures, the inertia is not adjustable, the application scene is single, the application provides an inertia-adjustable flywheel energy storage device which is not only adjustable in inertia, applicable to more scenes, but also matched with power sources of various powers or models, and convenient to apply and popularize.

Referring to fig. 1, an inertia adjustable flywheel energy storage device 10 according to an embodiment of the present application may include a housing 11, a rotating shaft 12, a main flywheel 13, a flywheel mass 14, and a power source 15. The housing 11 has a cavity 111a. At least part of the structure of the rotating shaft 12 is disposed in the cavity 111a. The main flywheel 13 is disposed within the cavity 111a and is coupled to the shaft 12. The counter flywheel block 14 is detachably connected to the main flywheel 13. The power source 15 is connected with the rotating shaft 12, and the power source 15 is used for driving the rotating shaft 12 to rotate, so that the rotating shaft 12 drives the main flywheel 13 and the auxiliary flywheel block 14 to rotate.

The inertia adjustable flywheel energy storage device 10 is detachably connected to the main flywheel 13 through the flywheel matching blocks 14, so that the inertia adjustable flywheel energy storage device 10 can adaptively adjust the number of the flywheel matching blocks 14 according to comprehensive consideration of energy storage energy and response speed, so as to achieve a proper balance point of the energy storage energy and the response speed, thereby realizing inertia adjustment of the inertia adjustable flywheel energy storage device 10 and widening application scenes.

Alternatively, the aforementioned power source 15 may be implemented as, but is not limited to, an electric machine to achieve the interconversion of mechanical and electrical energy.

Optionally, with continued reference to fig. 1, the housing 11 may have an opening 11a in communication with the cavity 111a, the shaft 12 has a first end 121 and a second end 122, the first end 121 is disposed through the opening 11a and rotatably connected to a side of the housing 11 away from the opening 11a in the cavity 111a, and the second end 122 is disposed through the opening 11a and connected to the power source 15. It should be noted that, at this time, the power source 15 is disposed outside the cavity 111a, and the second end 122 penetrates the opening 11a and is connected to the power source 15 disposed outside the cavity 111a, so as to facilitate the connection between the power source 15 and the rotating shaft 12, and facilitate more convenient adaptation and replacement of the power sources 15 with different models.

Optionally, the power source 15 has an output end 151, and the second end 122 is detachably connected with the output end 151, so that the power source 15 of an appropriate type can be adapted according to different application scenarios, only the output end 151 of the power source 15 needs to be connected with the rotating shaft 12, and the applicability of the inertia adjustable flywheel energy storage device 10 under different scenarios is improved.

Optionally, the inertia adjustable flywheel energy storage device 10 further includes a coupling 17, where the coupling 17 is used to connect the output end 151 of the power source 15 with the second end 122 of the rotating shaft 12, so that quick-disassembly and quick-assembly of the power source 15 can be realized, and convenience and applicability are improved.

It should be noted that in other embodiments, the connection between the power source 15 and the shaft 12 may be, but is not limited to, a fixed connection, which can improve structural stability.

In addition, referring to fig. 3, in some other embodiments, the rotating shaft 12 is disposed in the cavity 111a, and two ends of the rotating shaft 12 are respectively rotatably connected to two opposite sides of the housing 11, and the power source 15 is disposed in the cavity 111a and connected to the rotating shaft 12, so that the integration and the integration of the inertia adjustable flywheel energy storage device 10 can be improved, and the volume of the inertia adjustable flywheel energy storage device 10 can be reduced. Furthermore, the power source 15 is disposed in the cavity 111a, so that the power source 15 can be in a relatively closed environment for energy conversion, and the influence of the environment on energy consumption is reduced, for example, the energy consumption of the power source 15 caused by wind resistance is reduced.

Alternatively, with continued reference to fig. 3, the power source 15 may be, but not limited to, directly connected to a portion of the shaft 12 between the first end 121 and the second end 122, and the power source 15 may be fixed to the housing 11 within the cavity 111a, so as to prevent the power source 15 body from rotating, and ensure that the energy conversion process is performed smoothly.

Preferably, with continued reference to fig. 3, the cavity 111a is sealed and in a vacuum state, so that energy conversion loss between the power source 15 and the main flywheel 13 and the auxiliary flywheel block 14 can be further reduced, and energy conversion efficiency is improved. It should be noted that the cavity 111a in this embodiment is in a sealed and vacuum state, which is also helpful for reducing noise of the inertia adjustable flywheel energy storage device 10 and improving silence of the inertia adjustable flywheel energy storage device 10.

Optionally, the housing 11 may be provided with, but is not limited to, a vacuum hole (not shown) for performing a vacuum operation.

Alternatively, as shown in connection with fig. 1 to 3, the cabinet 11 may include a cabinet body 111, a first end cover 112, and a second end cover 113. The shell body 111 has a cavity 111a, and a first opening 111b and a second opening 111c that are communicated with the cavity 111a, and the first end cover 112 and the second end cover 113 are detachably connected to two sides of the shell body 111 respectively to cover the first opening 111b and the second opening 111c, so that convenience in assembling the structure is improved, and applicability in different scenes is improved.

Alternatively, the first end cover 112 and the second end cover 113 may be provided with bearing structures, respectively, so that the bearing structures are used for positioning and supporting the two ends of the rotating shaft 12 when assembling, thereby facilitating rapid assembly. Preferably, as shown in fig. 1 and 3, the first end cover 112 and the second end cover 113 are respectively connected with a first magnetic bearing 1121 and a second magnetic bearing 1131, and the rotating shaft 12 is suspended and supported on the first magnetic bearing 1121 and the second magnetic bearing 1131, so that the rotation friction consumption of the rotating shaft 12 is reduced, and the energy conversion efficiency of the inertia adjustable flywheel energy storage device 10 is improved.

Optionally, as shown in fig. 4, the main flywheel 13 may include a side wall 131 and a bottom wall 132 connected to each other, where the axis 12a of the rotating shaft 12 and the plane of the bottom wall 132 are perpendicular to each other, and the rotating shaft 12 is connected to the center of the bottom wall 132 in the plane direction, where the side wall 131 and the bottom wall 132 enclose and form a cavity 13a for detachably connecting the flywheel matching block 14, so that inertia adjustment of the inertia adjustable flywheel energy storage device 10 can be achieved by installing the flywheel matching block 14 in the cavity 13a, and convenience is improved.

It is noted that the shaft 12 and the main flywheel 13 may be, but are not limited to being, implemented as a fixed connection. The main flywheel 13 serves as a minimum inertia structure of the inertia tunable flywheel energy storage device 10, in other words, the inertia of the inertia tunable flywheel energy storage device 10 is at a minimum when the cavity 13a is not provided with the flywheel mass 14. Thus, the number of flywheel blocks 14 can be adaptively adjusted according to the comprehensive consideration of the stored energy and the response speed, so as to achieve a suitable balance point of the stored energy and the response speed.

Alternatively, as shown in fig. 5 and 6, the flywheel mass 14 has a through hole, the flywheel mass 14 is detachably disposed through the rotating shaft 12 by the through hole, and when the number of flywheel masses 14 is at least 2, each flywheel mass 14 is stacked on the cavity 13a. For example, the number of flywheel masses 14 may be 2, 3, or 4.

Preferably, the inertia adjustable flywheel energy storage device 10 is further provided with a limiting structure (not shown) for limiting each of the flywheel mass blocks 14 in the cavity 13a, so as to limit the rotation of each of the flywheel mass blocks 14 about the axis 12a of the rotating shaft 12 relative to the side wall 131, which is helpful for improving the operation stability of the inertia adjustable flywheel energy storage device 10.

Alternatively, the limit structure may be, but is not limited to being, implemented as a first limit portion of the contact surface of each mating flywheel mass 14 along the axis 12 a. The first limiting portion may be implemented as a limiting protrusion, a limiting ridge, or the like. The surfaces of the flywheel blocks 14 contacting with each other can be mutually limited by the first limiting parts when being stacked, so that the flywheel blocks 14 form a structural whole, the mutual movement between the flywheel blocks 14 is reduced, and the running stability of the inertia adjustable flywheel energy storage device 10 is improved.

Alternatively, the stopper structure may be implemented as, but not limited to, a second stopper portion provided in the circumferential direction of the sidewall 131 around the axis 12 a. The second limiting portion may be, but not limited to, implemented as a limiting groove or a limiting groove, and the limiting groove or the limiting groove with a specific shape is designed to enable each flywheel block 14 to perform a limiting fit with the side wall 131 along the circumferential direction. It will be appreciated that each of the flywheel masses 14 in this embodiment is also circumferentially provided with a structure or shape for co-operation with the second stop portion. In this way, the circumferential surfaces of the flywheel blocks 14 can be mutually limited by the second limiting portions while being stacked, so that a structural whole is formed between each flywheel block 14 and the main flywheel 13, and the movement of each flywheel block 14 relative to the main flywheel 13 is reduced, which is helpful for improving the operation stability of the inertia adjustable flywheel energy storage device 10.

Optionally, when each of the flywheel mass parts 14 is stacked in the cavity 13a, the height of the flywheel mass part 14 at the uppermost layer is smaller than or equal to the height of the cavity 13a along the axial height of the rotating shaft 12, so that the rotational stability of the inertia adjustable flywheel energy storage device 10 can be improved.

Alternatively, as shown in fig. 5 and 6, the inertia adjustable flywheel energy storage device 10 may include a fixing structure 16, where the fixing structure 16 is movably connected to the rotating shaft 12, and when each of the flywheel mass parts 14 is stacked in the cavity 13a, the fixing structure 16 abuts against the flywheel mass part 14 located at the uppermost layer along the axis 12a direction of the rotating shaft 12, so as to limit the displacement of each of the flywheel mass parts 14 in the axial direction. In this way, the fixing structure 16 can be moved adaptively according to the number of the matched flywheel blocks 14, so that the matched flywheel blocks 14 are pressed and fixed by the fixing structure 16. In addition, the pressing force of the fixing structure 16 on the uppermost flywheel matching block 14 can be increased to limit each flywheel matching block 14 relative to the main flywheel 13 under the extrusion action, so that the rotational stability of the inertia adjustable flywheel energy storage device 10 can be improved.

Alternatively, the securing structure 16 may be implemented as, but is not limited to, a snap or detent structure.

Optionally, the inertia adjustable flywheel energy storage device 10 may include a locking structure (not shown) for locking the position of the fixing structure 16 on the rotating shaft 12 to maintain the pressing force of the fixing structure 16 on the uppermost flywheel mass 14.

Alternatively, the locking structure may be implemented as, but is not limited to, a latch or claw, or the like.

It is appreciated that the inertia adjustable flywheel energy storage device 10 of the present application described above may be applied to a flywheel energy storage system, which may include a bearing system, a power conversion system, a cooling system, a control system, and a vacuum chamber.

According to the flywheel energy storage system, the flywheel matching blocks 14 of the inertia adjustable flywheel energy storage device 10 are detachably connected to the main flywheel 13, so that the inertia adjustable flywheel energy storage device 10 can adaptively adjust the number of the flywheel matching blocks 14 according to comprehensive consideration of energy storage energy and response speed, so that a proper balance point of the energy storage energy and the response speed is achieved, inertia adjustment of the flywheel energy storage system is realized, and an application scene is widened.

It is noted that the power source 15 of the flywheel energy storage system described above may be implemented as, but is not limited to, an electric machine. It is understood that the aforementioned electric machine may be an electric motor or an electric generator, or the electric motor and the electric generator may be integrated in one component. The motor or generator is responsible for the conversion between electrical and mechanical energy. In the energy storage mode, the motor drives the main flywheel 13 and the auxiliary flywheel block 14 of the flywheel energy storage device 10 with adjustable inertia to accelerate and rotate, and converts electric energy into mechanical energy for storage, and in the energy release mode, the motor operates as a generator, and converts the stored mechanical energy back into electric energy for an external load to use electric power.

The bearing system is used for supporting the rotating shaft 12, reducing friction resistance and ensuring efficient and reliable operation of the inertia adjustable flywheel energy storage device 10. It should be noted that the inertia adjustable flywheel energy storage device 10 of the flywheel energy storage system is preferably implemented as a vertical installation and provides axial force through a bearing system. More preferably, the bearing system may be, but is not limited to being, implemented as a magnetic bearing system that can be matched by the control system to the appropriate magnetic force based on the actual mass of the inertia adjustable flywheel energy storage device 10, which can significantly reduce mechanical losses.

The power conversion system is used for improving the flexibility and controllability of the flywheel energy storage system, and the power conversion system carries out frequency modulation, rectification or constant voltage processing on the output electric energy of the flywheel energy storage system so as to meet different load demands.

The cooling system ensures that heat generated by the flywheel energy storage system in the charging and discharging processes can be effectively dissipated, so that components of the system are protected, the service lives of all structures are prolonged, and the efficiency and reliability of the whole system are improved.

The control system relates to priority setting of various working modes, accurate energy conversion control, parallel operation control strategies and realization of emergency power supply functions, so that the flywheel energy storage system can operate efficiently and stably in different application scenes.

The vacuum chamber mainly provides a vacuum environment to reduce windage loss during motor operation, thereby improving the operation efficiency of the flywheel energy storage system.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the claims. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.

Claims (6)

1. An inertia adjustable flywheel energy storage device, characterized in that the inertia adjustable flywheel energy storage device comprises:

A housing having a cavity;

the rotating shaft is at least partially structurally arranged in the cavity;

The main flywheel is arranged in the cavity and is connected with the rotating shaft;

the flywheel matching block is detachably connected with the main flywheel;

the power source is connected with the rotating shaft and used for driving the rotating shaft to rotate, so that the rotating shaft drives the main flywheel and the flywheel matching block to rotate;

The main flywheel comprises a side wall and a bottom wall which are connected, the axis of the rotating shaft is perpendicular to the plane of the bottom wall, the rotating shaft is connected to the center of the bottom wall in the direction of the plane, and the side wall and the bottom wall enclose and form a cavity for detachably connecting the flywheel matching block;

the flywheel matching blocks are provided with perforations, the flywheel matching blocks detachably penetrate through the rotating shaft through the perforations, and when the number of the flywheel matching blocks is at least 2, the flywheel matching blocks are stacked in the cavity;

The inertia adjustable flywheel energy storage device further comprises a fixing structure, wherein the fixing structure is movably connected to the rotating shaft, and when all the flywheel matching blocks are stacked in the cavity, the fixing structure is pressed against the flywheel matching block positioned at the uppermost layer along the axial direction of the rotating shaft;

the inertia adjustable flywheel energy storage device is further provided with a limiting structure, and the limiting structure is used for limiting each flywheel matching block in the cavity so as to limit each flywheel matching block to rotate around the rotating shaft relative to the side wall.

2. The inertia adjustable flywheel energy storage device of claim 1, wherein the housing has an aperture in communication with the cavity, the shaft has a first end and a second end, the first end is disposed through the aperture and rotatably connected to a side of the housing within the cavity away from the aperture, and the second end is disposed through the aperture and connected to the power source.

3. An inertia tunable flywheel energy storage device as claimed in claim 2 wherein the power source has an output end, the second end being detachably connected to the output end.

4. The inertia adjustable flywheel energy storage device of claim 1, wherein the shaft is disposed in the cavity, two ends of the shaft are rotatably connected to opposite sides of the housing, respectively, and the power source is disposed in the cavity and connected to the shaft.

5. The inertia tunable flywheel energy storage device of claim 4, wherein the cavity is sealed and in a vacuum state.

6. The inertia adjustable flywheel energy storage device of claim 1, wherein the housing comprises a housing body, a first end cap and a second end cap, the housing body has the cavity, and a first opening and a second opening that communicate with the cavity, the first end cap and the second end cap are detachably connected to two sides of the housing body to cover the first opening and the second opening, the first end cap and the second end cap are connected with a first magnetic bearing and a second magnetic bearing, respectively, and the rotating shaft is suspended and supported on the first magnetic bearing and the second magnetic bearing.