Inertia-adjustable flywheel energy storage device

Abstract

The invention relates to an inertia-adjustable flywheel energy storage device which can solve the problems that in the prior art, the inertia of a flywheel cannot be adjusted, and the application scene is single. The inertia-adjustable flywheel energy storage device comprises a machine shell, wherein the machine shell is provided with a cavity; at least part of the structure of the rotating shaft is arranged in the cavity; the main flywheel is arranged in the cavity and is connected with the rotating shaft; the auxiliary flywheel block is detachably connected to the main flywheel; and 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 auxiliary flywheel block to rotate. According to the scheme, through the arrangement that the matched flywheel blocks are detachably connected to the main flywheel, the inertia-adjustable flywheel energy storage device can adaptively adjust the number of the matched flywheel blocks according to comprehensive consideration of the stored energy and the response speed, so that a proper balance point of the stored energy and the response speed is achieved; the inertia of the inertia-adjustable flywheel energy storage device is adjustable, and the application scene is widened.

Description

Technical Field

[0001] The present application relates to the technical field of energy storage devices, and in particular to a flywheel energy storage device with adjustable inertia. Background Art

[0002] With the development of energy storage technology, energy storage devices that combine motors and flywheels have emerged, which realize the mutual conversion and storage between electrical energy and the mechanical kinetic energy of a high-speed flywheel. Among them, flywheels with larger inertia can store more energy and release more energy when needed, but this may also cause the system to respond more slowly. On the contrary, although flywheels with smaller inertia store less energy, they respond faster and are more suitable for application scenarios that require quick response. However, in the relevant technology, the flywheels of most current flywheel energy storage devices are solid cylindrical structures, their inertia cannot be adjusted, and the application scenarios are relatively single. Summary of the invention

[0003] Based on this, it is necessary to provide a flywheel energy storage device with adjustable inertia to address the problems in related technologies that the flywheel inertia cannot be adjusted and the application scenarios are relatively single.

[0004] An inertia-adjustable flywheel energy storage device, the inertia-adjustable flywheel energy storage device comprising:

[0005] A casing having a cavity;

[0006] A rotating shaft, at least a portion of which is disposed in the cavity;

[0007] A main flywheel, the main flywheel is arranged in the cavity and connected to the rotating shaft;

[0008] A supporting flywheel block, the supporting flywheel block is detachably connected to the main flywheel;

[0009] A power source is connected to the rotating shaft, and the power source is used to drive the rotating shaft to rotate, so that the rotating shaft drives the main flywheel and the auxiliary flywheel block to rotate.

[0010] In one embodiment, the main flywheel includes connected side walls and a bottom wall, the axis of the rotating shaft and the plane of the bottom wall are arranged perpendicular to each other, and 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 matching flywheel block.

[0011] In one embodiment, the flywheel block has a through hole, and the flywheel block is detachably installed on the rotating shaft through the through hole. When the number of the flywheel blocks is at least 2, each of the flywheel blocks is stacked in the cavity.

[0012] In one embodiment, the adjustable inertia flywheel energy storage device includes a fixed structure, which is movably connected to the rotating shaft. When each of the flywheel blocks is stacked in the cavity, the fixed structure is pressed against the flywheel block located at the top layer along the axial direction of the rotating shaft.

[0013] In one of the embodiments, the adjustable inertia flywheel energy storage device is further provided with a limiting structure, and the limiting structure is used to limit each of the flywheel blocks in the cavity to limit the rotation of each of the flywheel blocks around the rotating shaft relative to the side wall.

[0014] In one embodiment, the housing has an opening connected to the cavity, and the rotating shaft has a first end and a second end. The first end passes through the opening and is rotatably connected to a side of the housing away from the opening in the cavity, and the second end passes through the opening and is connected to the power source.

[0015] In one embodiment, the power source has an output end, and the second end is detachably connected to the output end.

[0016] In one embodiment, the rotating shaft is placed in the cavity, and two ends of the rotating shaft are rotatably connected to opposite sides of the housing respectively, and the power source is placed in the cavity and connected to the rotating shaft.

[0017] In one embodiment, the cavity is sealed and in a vacuum state.

[0018] In one embodiment, the casing includes a shell body, a first end cover and a second end cover, the shell body has the cavity, and a first opening and a second opening connected to the cavity, the first end cover and the second end cover are respectively detachably connected to the two sides of the shell body to cover the first opening and the second opening, the first end cover and the second end cover are respectively connected to the first magnetic bearing and the second magnetic bearing, and the rotating shaft is suspended and supported on the first magnetic bearing and the second magnetic bearing.

[0019] The above-mentioned flywheel energy storage device with adjustable inertia is provided with a flywheel block detachably connected to the main flywheel, so that the flywheel energy storage device with adjustable inertia and the flywheel energy storage system can adaptively adjust the number of flywheel blocks according to the comprehensive consideration of energy storage energy and response speed to achieve a suitable balance between energy storage energy and response speed, thereby achieving adjustable inertia of the flywheel energy storage device and broadening the application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] FIG1 is a cross-sectional view of the structure of an adjustable inertia flywheel energy storage device in one embodiment of the present application.

[0021] FIG. 2 is an exploded view of a flywheel energy storage device with adjustable inertia in one embodiment of the present application.

[0022] FIG3 is a cross-sectional view of a flywheel energy storage device with adjustable inertia in another embodiment of the present application.

[0023] FIG. 4 is a partial structural schematic diagram of the flywheel energy storage device with adjustable inertia shown in FIG. 1 .

[0024] FIG5 is a partial structural diagram of a flywheel energy storage device with adjustable inertia in yet another embodiment of the present application.

[0025] FIG6 is a partial structural diagram of a flywheel energy storage device with adjustable inertia in yet another embodiment of the present application.

[0026] Description of Figure Numbers

[0027] 10. Inertia adjustable flywheel energy storage device; 11. Casing; 11a. Opening; 111. Shell body; 112. First end cover; 113. Second end cover; 111a. Cavity; 111b. First opening; 111c. Second opening; 1121. First magnetic bearing; 1131. Second magnetic bearing; 12. Rotating shaft; 12a. Axis; 121. First end; 122. Second end; 13. Main flywheel; 131. Side wall; 132. Bottom wall; 13a. Cavity; 14. Matching flywheel block; 15. Power source; 151. Output end; 16. Fixed structure; 17. Coupling. DETAILED DESCRIPTION

[0028] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0029] In the description of the present application, it should be understood that if 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. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0030] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0031] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; 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 this application can be understood according to the specific circumstances.

[0032] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the 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. The first feature being "below", "below" and "below" the 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.

[0033] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0034] Considering that the flywheels of most existing flywheel energy storage devices with adjustable inertia are solid cylindrical structures, their inertia is not adjustable, and their application scenarios are relatively single, the present application provides a flywheel energy storage device with adjustable inertia, which not only has adjustable inertia and can be applied to more scenarios, but also can match power sources of various power or models, which is convenient for application and promotion.

[0035] Specifically, please refer to Figure 1. An embodiment of the present application provides an adjustable inertia flywheel energy storage device 10, which may include a housing 11, a rotating shaft 12, a main flywheel 13, a matching flywheel block 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 in the cavity 111a and is connected to the rotating shaft 12. The matching flywheel block 14 is detachably connected to the main flywheel 13. The power source 15 is connected to the rotating shaft 12, and the power source 15 is used to drive the rotating shaft 12 to rotate, so that the rotating shaft 12 drives the main flywheel 13 and the matching flywheel block 14 to rotate.

[0036] The above-mentioned adjustable inertia flywheel energy storage device 10 is configured so that the auxiliary flywheel block 14 is detachably connected to the main flywheel 13, so that the adjustable inertia flywheel energy storage device 10 can adaptively adjust the number of auxiliary flywheel blocks 14 according to the comprehensive consideration of energy storage energy and response speed to achieve a suitable balance between energy storage energy and response speed. In this way, the inertia of the adjustable inertia flywheel energy storage device 10 is adjustable, thereby broadening the application scenarios.

[0037] Optionally, the power source 15 may be, but is not limited to, implemented as a motor to achieve mutual conversion between mechanical energy and electrical energy.

[0038] Optionally, referring to FIG. 1 , the housing 11 may have an opening 11a communicating with the cavity 111a, and the rotating shaft 12 has a first end 121 and a second end 122, the first end 121 is passed through the opening 11a and is rotatably connected to a side of the housing 11 away from the opening 11a in the cavity 111a, and the second end 122 passes through the opening 11a and is connected to the power source 15. It is worth noting that at this time, the power source 15 is placed outside the cavity 111a, and the second end 122 passes through the opening 11a and is connected to the power source 15 placed outside the cavity 111a, which helps to improve the convenience of connection between the power source 15 and the rotating shaft 12, and helps to more conveniently adapt and replace different models of power sources 15.

[0039] Optionally, the power source 15 has an output end 151, and the second end 122 is detachably connected to the output end 151. In this way, a suitable type of power source 15 can be adapted according to different application scenarios. It is only necessary to connect the output end 151 of the power source 15 to the rotating shaft 12, thereby improving the applicability of the adjustable inertia flywheel energy storage device 10 in different scenarios.

[0040] Optionally, the adjustable inertia flywheel energy storage device 10 further includes a coupling 17, which is used to connect the output end 151 of the power source 15 and the second end 122 of the rotating shaft 12, so that the power source 15 can be quickly disassembled and assembled, thereby improving convenience and applicability.

[0041] It is worth noting that in some other embodiments, the connection between the power source 15 and the rotating shaft 12 may also be, but is not limited to, implemented as a fixed connection, which can improve structural stability.

[0042] In addition, please refer to Fig. 3, in some other embodiments, the rotating shaft 12 is placed in the cavity 111a, and the two ends of the rotating shaft 12 are respectively rotatably connected to the opposite sides of the casing 11, and the power source 15 is placed in the cavity 111a and connected to the rotating shaft 12, so that the integrity and integration of the adjustable inertia flywheel energy storage device 10 can be improved, and the volume of the adjustable inertia flywheel energy storage device 10 can be reduced. Furthermore, by placing the power source 15 in the cavity 111a, the power source 15 can be in a relatively closed environment for energy conversion, reducing the impact of the environment on energy consumption, such as reducing the consumption of wind resistance on the energy of the power source 15.

[0043] Optionally, referring to FIG. 3 , the power source 15 may be but is not limited to being directly connected to the portion of the rotating 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 to prevent the power source 15 body from rotating, thereby ensuring a smooth energy conversion process.

[0044] Preferably, referring to Fig. 3, the cavity 111a is sealed and in a vacuum state, which can further reduce the energy conversion loss between the power source 15 and the main flywheel 13 and the auxiliary flywheel block 14, thereby improving the efficiency of energy conversion. It is worth noting that the cavity 111a of this embodiment is sealed and in a vacuum state, which also helps to reduce the noise of the adjustable inertia flywheel energy storage device 10 and improve the quietness of the adjustable inertia flywheel energy storage device 10.

[0045] Optionally, the housing 11 may be, but is not limited to, provided with a vacuum hole (not shown) for performing a vacuum operation.

[0046] Optionally, as shown in Figures 1 to 3, the housing 11 may include a housing body 111, a first end cover 112, and a second end cover 113. The housing body 111 has a cavity 111a, and a first opening 111b and a second opening 111c communicating with the cavity 111a. The first end cover 112 and the second end cover 113 are detachably connected to both sides of the housing body 111 to cover the first opening 111b and the second opening 111c, respectively, so as to improve the convenience of structural assembly and improve the applicability in different scenarios.

[0047] Optionally, the first end cover 112 and the second end cover 113 may be provided with a bearing structure, so that during assembly, the bearing structure is used to position and support the two ends of the rotating shaft 12, which helps to quickly assemble. Preferably, in combination with Figures 1 and 3, the first end cover 112 and the second end cover 113 are respectively connected to the first magnetic bearing 1121 and the 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, thereby reducing the rotational friction consumption of the rotating shaft 12 and improving the energy conversion efficiency of the adjustable inertia flywheel energy storage device 10.

[0048] Optionally, as shown in Figure 4, the main flywheel 13 may include a connected side wall 131 and a bottom wall 132, the axis 12a of the rotating shaft 12 and the plane of the bottom wall 132 are arranged perpendicular to each other, and the rotating shaft 12 is connected to the center of the bottom wall 132 in the direction of the plane, and the side wall 131 and the bottom wall 132 are enclosed and formed to form a cavity 13a for detachably connecting the matching flywheel block 14. In this way, by installing the matching flywheel block 14 in the cavity 13a, the inertia adjustment of the adjustable inertia flywheel energy storage device 10 can be achieved, thereby improving convenience.

[0049] It is worth noting that the rotating shaft 12 and the main flywheel 13 can be implemented as a fixed connection but is not limited to being implemented. The main flywheel 13 serves as the minimum inertia structure of the adjustable inertia flywheel energy storage device 10. In other words, when the cavity 13a is not equipped with the flywheel block 14, the inertia of the adjustable inertia flywheel energy storage device 10 is at a minimum. In this way, the number of the flywheel blocks 14 can be adaptively adjusted according to the comprehensive consideration of the energy storage energy and the response speed to achieve a suitable balance point between the energy storage energy and the response speed.

[0050] Optionally, as shown in Figures 5 and 6, the flywheel block 14 has a perforation, and the flywheel block 14 is detachably installed on the rotating shaft 12 through the perforation. When the number of the flywheel blocks 14 is at least 2, each flywheel block 14 is stacked in the cavity 13a. For example, the number of the flywheel blocks 14 can be 2, 3 or 4.

[0051] Preferably, the adjustable inertia flywheel energy storage device 10 is further provided with a limiting structure (not shown), which is used to limit each matching flywheel block 14 in the cavity 13a to limit the rotation of each matching flywheel block 14 relative to the side wall 131 around the axis 12a of the rotating shaft 12, which helps to improve the operating stability of the adjustable inertia flywheel energy storage device 10.

[0052] Optionally, the limiting structure may be, but is not limited to, implemented as a first limiting portion of the contact surface of each flywheel block 14 along the axis 12a. The first limiting portion may be, but is not limited to, implemented as a limiting protrusion or a limiting pattern. When stacking, the surfaces of the flywheel blocks 14 in contact with each other are mutually limited by the aforementioned first limiting portion, thereby forming a structural whole between the flywheel blocks 14, reducing the mutual movement between the flywheel blocks 14, and thus helping to improve the operating stability of the flywheel energy storage device 10 with adjustable inertia.

[0053] Optionally, the limiting structure can be implemented as, but not limited to, a second limiting portion arranged on the side wall 131 along the circumferential direction around the axis 12a. The second limiting portion can be implemented as, but not limited to, a limiting pattern or a limiting groove. By designing a limiting pattern or a limiting groove of a specific shape, each matching flywheel block 14 can be limitedly matched with the side wall 131 along the circumferential direction. It can be understood that in this embodiment, each matching flywheel block 14 is also provided with a structure or shape for mutual limiting cooperation with the second limiting portion along the circumferential direction. In this way, each matching flywheel block 14 can be stacked while its circumferential surface can be mutually limited with the aforementioned second limiting portion, thereby forming a structural whole between each matching flywheel block 14 and the main flywheel 13, reducing the movement of each matching flywheel block 14 relative to the main flywheel 13, which helps to improve the operating stability of the adjustable inertia flywheel energy storage device 10.

[0054] Optionally, when each flywheel block 14 is stacked in the cavity 13a, the height of the uppermost flywheel block 14 along the axial height of the rotating shaft 12 is less than or equal to the height of the cavity 13a, thereby improving the rotational stability of the adjustable inertia flywheel energy storage device 10.

[0055] Optionally, in combination with FIG. 5 and FIG. 6, the flywheel energy storage device 10 with adjustable inertia may include a fixed structure 16, which is movably connected to the rotating shaft 12. When each flywheel block 14 is stacked in the cavity 13a, the fixed structure 16 is pressed against the flywheel block 14 located at the top layer along the axis 12a direction of the rotating shaft 12 to limit the displacement of each flywheel block 14 in the axial direction. In this way, the fixed structure 16 can be moved adaptively according to the number of flywheel blocks 14 so that the fixed structure 16 presses and fixes the flywheel block 14. In addition, the pressing force of the fixed structure 16 on the flywheel block 14 at the top layer can be increased to limit each flywheel block 14 relative to the main flywheel 13 under the extrusion effect, so as to help improve the rotation stability of the flywheel energy storage device 10 with adjustable inertia.

[0056] Optionally, the fixing structure 16 may be, but is not limited to, implemented as a structure such as a buckle or a claw.

[0057] Optionally, the adjustable inertia 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 block 14 .

[0058] Optionally, the locking structure may be implemented as, but not limited to, a latch or a claw.

[0059] It is understandable that the above-mentioned adjustable inertia flywheel energy storage device 10 of the present application can 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.

[0060] The above-mentioned flywheel energy storage system, through the setting that the auxiliary flywheel block 14 of the above-mentioned adjustable inertia flywheel energy storage device 10 is detachably connected to the main flywheel 13, enables the adjustable inertia flywheel energy storage device 10 to adaptively adjust the number of auxiliary flywheel blocks 14 according to the comprehensive consideration of energy storage energy and response speed, so as to achieve a suitable balance point between energy storage energy and response speed, thereby realizing the adjustable inertia of the flywheel energy storage system and broadening the application scenarios.

[0061] It is worth noting that the power source 15 of the above-mentioned flywheel energy storage system can be implemented as a motor but is not limited to it. It is understandable that the aforementioned motor can be an electric motor or a generator, or the electric motor and the generator are integrated in one component. The motor or generator is responsible for realizing the conversion between electrical energy and mechanical energy. In the energy storage mode, the motor drives the main flywheel 13 and the auxiliary flywheel block 14 of the adjustable inertia flywheel energy storage device 10 to accelerate the rotation, converting the electrical energy into mechanical energy for storage; in the energy release mode, the motor operates as a generator, converting the stored mechanical energy back into electrical energy for external loads to use electricity.

[0062] The function of the bearing system is to support the rotating shaft 12, reduce friction resistance, and ensure the efficient and reliable operation of the adjustable inertia flywheel energy storage device 10. It should be noted that the adjustable inertia flywheel energy storage device 10 of the above-mentioned flywheel energy storage system is preferably implemented as a vertical installation, and the axial force is provided by the bearing system. More preferably, the bearing system can be implemented as a magnetic suspension bearing system, but is not limited to being implemented as a magnetic suspension bearing system, and the magnetic suspension bearing system can be matched with a suitable magnetic force by the control system according to the actual mass of the adjustable inertia flywheel energy storage device 10, so that the mechanical loss can be significantly reduced.

[0063] The power conversion system is used to improve the flexibility and controllability of the flywheel energy storage system. The power conversion system performs frequency modulation, rectification or constant voltage processing on the output electric energy of the flywheel energy storage system to meet different load requirements.

[0064] The cooling system ensures that the heat generated by the flywheel energy storage system during the charging and discharging process can be effectively dissipated, thereby protecting the system components, extending the service life of each structure, and improving the efficiency and reliability of the entire system.

[0065] The control system involves priority setting of multiple working modes, precise energy conversion control, parallel operation control strategy and implementation of emergency power supply function to ensure that the flywheel energy storage system can operate efficiently and stably in different application scenarios.

[0066] The vacuum chamber mainly provides a vacuum environment to reduce windage loss when the motor is running, thereby improving the operating efficiency of the flywheel energy storage system.

[0067] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0068] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A flywheel energy storage device with adjustable inertia, characterized in that: The inertia adjustable flywheel energy storage device comprises: A casing having a cavity; A rotating shaft, at least a portion of which is disposed in the cavity; A main flywheel, the main flywheel is arranged in the cavity and connected to the rotating shaft; A supporting flywheel block, the supporting flywheel block is detachably connected to the main flywheel; A power source is connected to the rotating shaft, and the power source is used to drive the rotating shaft to rotate, so that the rotating shaft drives the main flywheel and the auxiliary flywheel block to rotate.

2. The inertia adjustable flywheel energy storage device according to claim 1, characterized in that: The main flywheel includes a connected side wall and a bottom wall, the axis of the rotating shaft and the plane of the bottom wall are arranged perpendicular to each other, and 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 matching flywheel block.

3. The inertia adjustable flywheel energy storage device according to claim 2, characterized in that: The matching flywheel block has a through hole, and the matching flywheel block is detachably installed on the rotating shaft through the through hole. When the number of the matching flywheel blocks is at least 2, each of the matching flywheel blocks is stacked in the cavity.

4. The inertia adjustable flywheel energy storage device according to claim 3, characterized in that: The adjustable inertia flywheel energy storage device comprises a fixed structure, which is movably connected to the rotating shaft. When each of the flywheel blocks is stacked in the cavity, the fixed structure presses against the flywheel block located at the uppermost layer along the axial direction of the rotating shaft.

5. The inertia adjustable flywheel energy storage device according to claim 2, characterized in that: The inertia adjustable flywheel energy storage device is also provided with a limiting structure, which is used to limit each of the flywheel blocks in the cavity to limit the rotation of each of the flywheel blocks around the rotating shaft relative to the side wall.

6. The inertia adjustable flywheel energy storage device according to claim 1, characterized in that: The housing has an opening connected to the cavity, the rotating shaft has a first end and a second end, the first end passes through the opening and is rotatably connected to a side of the housing away from the opening in the cavity, and the second end passes through the opening and is connected to the power source.

7. The inertia adjustable flywheel energy storage device according to claim 6, characterized in that: The power source has an output end, and the second end is detachably connected to the output end.

8. The inertia adjustable flywheel energy storage device according to claim 1, characterized in that: The rotating shaft is placed in the cavity, and two ends of the rotating shaft are rotatably connected to opposite sides of the housing respectively. The power source is placed in the cavity and connected to the rotating shaft.

9. The inertia adjustable flywheel energy storage device according to claim 8, characterized in that: The cavity is sealed and in a vacuum state.

10. The inertia adjustable flywheel energy storage device according to claim 1, characterized in that: The casing includes a shell body, a first end cover and a second end cover, the shell body has the cavity, and a first opening and a second opening connected to the cavity, the first end cover and the second end cover are respectively detachably connected to the two sides of the shell body to cover the first opening and the second opening, the first end cover and the second end cover are respectively connected to the first magnetic bearing and the second magnetic bearing, and the rotating shaft is suspended and supported on the first magnetic bearing and the second magnetic bearing.

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