Inertia adjustable flywheel energy storage device

Abstract

The present application relates to an inertia-adjustable flywheel energy storage device, which can solve the problem in the prior art that the flywheel inertia is not adjustable and the application scenario is relatively single. The inertia-adjustable flywheel energy storage device includes a housing, the housing has a cavity; a rotating shaft, at least part of the structure of the rotating shaft is arranged in the cavity; a main flywheel, the main flywheel is arranged in the cavity and connected to the rotating shaft; a matching flywheel block, the matching flywheel block is detachably connected to the main flywheel; a power source, the 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 matching flywheel block to rotate. The above scheme enables the inertia-adjustable flywheel energy storage device to adaptively adjust the number of matching flywheel blocks 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 inertia-adjustable flywheel energy storage device and broadening the application scenarios.

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, realizing the mutual conversion and storage between electrical energy and the mechanical kinetic energy of a high-speed flying wheel. Among them, a flywheel with a larger inertia can store more energy and release more energy when needed, but this may also cause the system response speed to slow down. On the contrary, although a flywheel with a smaller inertia stores less energy, it has a faster response speed and is more suitable for application scenarios that require a 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 where the flywheel inertia cannot be adjusted and the application scenarios are relatively single.

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

[0005] a housing having a cavity;

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

[0007] a main flywheel, the main flywheel being disposed 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 matching 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 walls and the bottom wall enclose and form a cavity for detachably connecting the flywheel block.

[0011] In one embodiment, the flywheel block has a through-hole, and the flywheel block is detachably mounted 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 on the top layer along the axial direction of the rotating shaft.

[0013] In one embodiment, the inertia adjustable flywheel energy storage device is further 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.

[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 is passed 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 both 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 configuration in which the flywheel blocks are 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 based on a 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 flywheel energy storage device with adjustable inertia is achieved, which broadens the application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 2 is a cross-sectional view of the structure of an inertia-adjustable flywheel energy storage device in one embodiment of the present application.

[0021] Figure 2 1 is an exploded view of an adjustable inertia flywheel energy storage device in one embodiment of the present application.

[0022] Figure 3 This is a cross-sectional view of a flywheel energy storage device with adjustable inertia in another embodiment of the present application.

[0023] Figure 4 for Figure 1 The diagram shows a partial structure of the flywheel energy storage device with adjustable inertia.

[0024] Figure 5 This is a partial structural diagram of a flywheel energy storage device with adjustable inertia in yet another embodiment of the present application.

[0025] Figure 6 This is a partial structural diagram of a flywheel energy storage device with adjustable inertia in another embodiment of the present application.

[0026] Explanation of Figure Numbers

[0027] 10. Flywheel energy storage device with adjustable inertia; 11. Casing; 11a. Opening; 111. Casing 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] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0029] In the description of this 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 this 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 this application.

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

[0031] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connected," "fixed," etc., should be interpreted broadly. For example, these terms may refer to fixed connections, removable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; and internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0032] In this application, unless otherwise expressly specified or limited, if a first feature is described as being "above" or "below" a second feature, or similar descriptions, this 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. Furthermore, when a first feature is described as being "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is described as being "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower 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 an intermediate 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 an intermediate element. 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 embodiment.

[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, facilitating application and promotion.

[0035] For details, please refer to the attached Figure 1 One embodiment of the present application provides an inertia-adjustable flywheel energy storage device 10, which may include a housing 11, a rotating shaft 12, a main flywheel 13, a supporting 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 supporting 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 supporting flywheel block 14 to rotate.

[0036] The above-mentioned flywheel energy storage device with adjustable inertia 10 is configured so that the flywheel blocks 14 are detachably connected to the main flywheel 13, so that the flywheel energy storage device with adjustable inertia 10 can adaptively adjust the number of 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 flywheel energy storage device with adjustable inertia 10 is adjusted, 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, continue to Figure 1The housing 11 may have an opening 11a communicating with the cavity 111a, and the rotating shaft 12 may have a first end 121 and a second end 122. The first end 121 is disposed through the opening 11a and is rotatably connected to the side of the housing 11 away from the opening 11a within the cavity 111a, while the second end 122 extends through the opening 11a and is connected to the power source 15. It is worth noting that in this case, the power source 15 is placed outside the cavity 111a, and the second end 122 extends through the opening 11a and is connected to the power source 15 placed outside the cavity 111a. This helps to improve the connection convenience between the power source 15 and the rotating shaft 12, and facilitates more convenient adaptation and replacement of 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 model 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, thereby enabling quick disassembly and assembly of the power source 15, 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] Also, see Figure 3 In other embodiments, the rotating shaft 12 is placed in the cavity 111a, and the two ends of the rotating shaft 12 are rotatably connected to opposite sides of the housing 11. The power source 15 is placed in the cavity 111a and connected to the rotating shaft 12. This can improve the integrity and integration of the adjustable inertia flywheel energy storage device 10 and reduce the volume of the adjustable inertia flywheel energy storage device 10. Furthermore, by placing the power source 15 in the cavity 111a, the power source 15 can be placed in a relatively closed environment to perform energy conversion, reducing the impact of the environment on energy consumption, such as reducing the energy consumption of the power source 15 due to wind resistance.

[0043] Optionally, continue to Figure 3 The power source 15 can be, but is not limited to, 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 can be fixed to the housing 11 in the cavity 111a to prevent the power source 15 body from rotating, thereby ensuring the smooth progress of the energy conversion process.

[0044] Preferably, continue to refer to Figure 3The cavity 111a is sealed and in a vacuum state, which further reduces energy conversion losses between the power source 15 and the main flywheel 13 and the auxiliary flywheel block 14, thereby improving energy conversion efficiency. It is worth noting that the sealed and vacuum state of the cavity 111a in this embodiment also helps reduce noise from the adjustable inertia flywheel energy storage device 10, thereby improving 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, combined Figures 1 to 3 As shown, 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. This improves the ease of assembly of the structure and enhances its applicability in different scenarios.

[0047] Optionally, the first end cover 112 and the second end cover 113 may be provided with bearing structures respectively, so that during assembly, the bearing structures are used to position and support both ends of the rotating shaft 12, which helps to quickly assemble. Figure 1 and Figure 3 As shown, 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, combined Figure 4 As shown, 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, but are not limited to, fixedly connected. 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 auxiliary flywheel block 14, the inertia of the adjustable-inertia flywheel energy storage device 10 is at its minimum. In this way, the number of auxiliary flywheel blocks 14 can be adaptively adjusted based on a comprehensive consideration of energy storage capacity and response speed to achieve an appropriate balance between energy storage capacity and response speed.

[0050] Optionally, combined Figure 5 and Figure 6 As shown, the flywheel block 14 has a through-hole, and the flywheel block 14 is detachably mounted on the rotating shaft 12 through the through-hole. When the number of the flywheel blocks 14 is at least two, each flywheel block 14 is stacked in the cavity 13a. For example, the number of the flywheel blocks 14 can be two, three, or four.

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

[0052] Optionally, the limiting structure may be, but is not limited to, implemented as a first limiting portion on 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. The flywheel blocks 14 can be stacked so that their contacting surfaces are mutually limited by the aforementioned first limiting portion, thereby forming a structurally integrated structure between the flywheel blocks 14 and reducing the relative movement between the flywheel blocks 14. This helps to improve the operational stability of the adjustable inertia flywheel energy storage device 10.

[0053] Optionally, the limiting structure can be implemented as, but not limited to, a second limiting portion provided 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 flywheel block 14 can be limitedly matched with the side wall 131 along the circumferential direction. It is understandable that in this embodiment, each 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 flywheel block 14 can be stacked while its circumferential surface can be mutually limited by the aforementioned second limiting portion, thereby forming a structural integral between each flywheel block 14 and the main flywheel 13, reducing the movement of each flywheel block 14 relative to the main flywheel 13, which helps to improve the operating stability of the flywheel energy storage device 10 with adjustable inertia.

[0054] Optionally, when the flywheel blocks 14 are 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, combined Figure 5 and Figure 6 As shown, 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 on the top layer along the axis 12a of the rotating shaft 12 to limit the axial displacement of each flywheel block 14. In this way, the fixed structure 16 can be adapted to be moved according to the number of flywheel blocks 14 so that the fixed structure 16 presses the flywheel blocks 14 against each other. In addition, the pressing force of the flywheel block 14 on the top layer can be increased by increasing the pressing force of the fixed structure 16 so that each flywheel block 14 is limited relative to the main flywheel 13 under the extrusion action, thereby helping to improve the rotational stability of the flywheel energy storage device 10 with adjustable inertia.

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

[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 arrangement that the auxiliary flywheel blocks 14 of the above-mentioned adjustable inertia flywheel energy storage device 10 are 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 based on the comprehensive consideration of energy storage energy and response speed 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 can be integrated into 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 flywheel energy storage device with adjustable inertia 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 frictional resistance, and ensure the 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 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, but not limited to, a magnetic levitation bearing system, which can be matched with a suitable magnetic force by a control system according to the actual mass of the inertia adjustable flywheel energy storage device 10, so that mechanical losses 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 power 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 for multiple operating modes, precise energy conversion control, parallel operation control strategy, and implementation of emergency power supply functions 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 during motor operation, thereby improving the operating efficiency of the flywheel energy storage system.

[0067] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned 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 merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A flywheel energy storage device with adjustable inertia, characterized in that: The inertia adjustable flywheel energy storage device comprises: a housing having a cavity; a rotating shaft, at least a portion of the rotating shaft being disposed in the cavity; a main flywheel, the main flywheel being disposed 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, the power source being connected to the rotating shaft and configured to drive the rotating shaft to rotate, so that the rotating shaft drives the main flywheel and the auxiliary flywheel block to rotate; 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 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 auxiliary flywheel block; The flywheel block has a through-hole, and the flywheel block is detachably mounted on the rotating shaft through the through-hole. When the number of the flywheel blocks is at least 2, each flywheel block is stacked in the cavity. The inertia-adjustable flywheel energy storage device further comprises a fixing structure, which is movably connected to the rotating shaft. When the flywheel blocks are stacked in the cavity, the fixing structure presses against the flywheel block located on the uppermost layer along the axis direction of the rotating shaft. The inertia-adjustable flywheel energy storage device is further 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.

2. The inertia adjustable flywheel energy storage device according to claim 1, characterized in that: The housing has an opening connected to the cavity, and the rotating shaft has a first end and a second end. The first end is passed 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.

3. The inertia adjustable flywheel energy storage device according to claim 2, characterized in that: The power source has an output end, and the second end is detachably connected to the output end.

4. 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.

5. The inertia adjustable flywheel energy storage device according to claim 4, characterized in that: The cavity is sealed and in a vacuum state.

6. The flywheel energy storage device with adjustable inertia 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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