High-power flywheel energy storage device for energy storage peak regulation

Abstract

A high-power flywheel energy storage device for energy storage and peak regulation comprises a rotating shaft rotatably installed on a rack, a bearing support is installed on the rotating shaft, an energy storage rotating wheel is arranged on the bearing support, and the energy storage rotating wheel and the bearing support are connected in a positioning mode through a plurality of dovetail groove structures arranged in the radial direction. The dovetail groove structure comprises a protruding edge which protrudes downwards and is arranged at the bottom end of the energy storage rotating wheel in the radial direction, the cross section of the protruding edge is a trapezoid with the narrow top end and the wide bottom end, the top end of the protruding edge and the bottom end of the energy storage rotating wheel are connected into a whole, and a trapezoidal guide sliding groove is formed in the end face of the top end of the bearing support in the radial direction. The large-diameter high-speed energy storage flywheel can eliminate stress concentration in the flywheel through large-size elastic deformation, is high in energy storage density, is very suitable for storing power generation peak electric energy of power generation systems such as a solar power generation system, a wind power generation system, a hydraulic power generation system and a thermal power generation system on a large scale, and is small in investment and low in cost. The high-power flywheel energy storage device for energy storage peak regulation is simple in structure and long in service life.

Description

Technical Field

[0001] The invention relates to a high-power flywheel energy storage device for energy storage and peak regulation. Background Art

[0002] Flywheel energy storage refers to a method of energy storage that uses an electric motor to drive a flywheel to rotate at high speed, and then uses the flywheel to drive a generator to generate electricity when needed. The development direction of flywheel energy storage technology is higher power density and longer service life. The flywheel body is the core component of the flywheel energy storage system. In order to maximize the storage capacity of the flywheel energy storage system, the existing technology usually achieves the goal of making the flywheel energy storage system have a higher energy storage density by increasing the angular velocity of the rotor or increasing the rotational inertia of the rotor. However, during the high-speed rotation of a large-diameter rotor, the rotor will be subjected to a huge centrifugal force. This centrifugal force can even tear the rotor made of metal materials apart. The use of high-strength carbon fiber composite materials (tensile strength up to 8.27GPa) will greatly reduce the moment of inertia of the rotor under the same diameter size, making it difficult to increase the storage energy of the flywheel energy storage system to a higher value. Therefore, the existing flywheel energy storage device cannot increase the moment of inertia of the flywheel to significantly increase the kinetic energy stored in the flywheel. That is, the existing technology believes that a flywheel that is too large and heavy will be subjected to a huge centrifugal force when rotating at high speed, which often exceeds the ultimate strength of the flywheel material and is very unsafe. Increasing the flywheel's rotational inertia cannot significantly increase the kinetic energy stored in the flywheel, which results in the energy density of existing flywheel energy storage being not high enough.

[0003] When a large-diameter energy storage flywheel is at high speed, each tiny mass unit will be subjected to a huge centrifugal force. At the same time, the metal material that constitutes the energy storage flywheel is not a true, ideal rigid body, but a metal material that will produce elastic deformation when subjected to force. When a large-diameter energy storage flywheel is subjected to centrifugal force at high speed, if the structure of the flywheel allows its metal material to produce elastic deformation movement when subjected to force, the stress concentration inside the flywheel can be greatly reduced, and cracks and other damages can be prevented from occurring inside the metal material that constitutes the flywheel. However, the structural design of various existing large-diameter high-speed energy storage flywheels in this regard is very imperfect, and it does not consider that large-diameter high-speed energy storage flywheels need to have a larger elastic deformation movement to eliminate the problem of stress concentration inside the flywheel. Summary of the invention

[0004] The purpose of the present invention is to provide a large-diameter, high-speed energy storage flywheel that can eliminate stress concentration inside the flywheel through relatively large-scale elastic deformation, has high energy storage density, and has a huge total energy value. It is very suitable for a high-power flywheel energy storage device for energy storage and peak regulation for large-scale storage of peak power generated by solar power generation systems, wind power generation systems, hydropower, thermal power generation systems and other power generation systems.

[0005] The high-power flywheel energy storage device for energy storage peak regulation of the present invention comprises a rotating shaft rotatably mounted on a frame, the axis of the rotating shaft is located in a vertical direction, a load-bearing bracket is mounted on the rotating shaft, an energy storage rotor made of a metal material is arranged on the load-bearing bracket, the energy storage rotor is arranged cocentrically with the rotating shaft, the energy storage rotor and the load-bearing bracket are positioned and connected through a plurality of dovetail groove structures arranged along the radial direction, the dovetail groove structure comprises a convex ridge protruding downwardly along the radial direction at the bottom end of the energy storage rotor, the cross section of the convex ridge is a trapezoid with a narrow top and a wide bottom, the top end of the convex ridge is connected to the bottom end of the energy storage rotor as a whole, a trapezoidal guide groove is arranged radially on the top end face of the load-bearing bracket, and the convex ridge is inserted into the guide groove on the top end face of the load-bearing bracket by a clearance fit;

[0006] The gravity exerted on the energy storage wheel acts on the load-bearing bracket. The energy storage wheel is connected to the rotating shaft through a plurality of tie rods. The plurality of tie rods are arranged around the rotating shaft along the radial direction of the rotating shaft. The tie rods are made of carbon fiber composite materials.

[0007] The rotating shaft is drivingly connected with the generator motor, and the energy storage wheel, the load-bearing bracket, a plurality of pull rods and the generator motor are placed in the vacuum chamber.

[0008] The high-power flywheel energy storage device for energy storage and peak regulation of the present invention, wherein the load-bearing support includes a circular tray and a plurality of inclined tie rods, the plurality of inclined tie rods are arranged around the top of the tray, the inclined upper end of each inclined tie rod is fixedly connected to the upper part of the rotating shaft, and the inclined lower end of each inclined tie rod is fixedly connected to the middle part or the outer edge of the tray.

[0009] The high-power flywheel energy storage device for energy storage and peak regulation of the present invention, wherein a plurality of inclined support rods are arranged around the bottom of the tray, the inclined lower end of each inclined support rod is fixedly connected to the lower part of the rotating shaft, and the inclined upper end of each inclined support rod is fixedly connected to the middle part or the outer edge of the tray.

[0010] The high-power flywheel energy storage device for energy storage and peak regulation of the present invention, wherein the pull rod is connected to the energy storage wheel by an enlarged head anchor rod anchoring structure, and the pull rod is connected to the rotating shaft by an enlarged head anchor rod anchoring structure.

[0011] The high-power flywheel energy storage device for energy storage and peak regulation of the present invention, wherein the outer wall of the rotating shaft is provided with two circular rings along the horizontal direction, each circular ring is connected to the rotating shaft as a whole, and a plurality of connecting pins are provided between two adjacent circular rings along the vertical direction around the axis of the rotating shaft, and the upper and lower ends of each connecting pin are respectively inserted and fixed on the corresponding circular ring, and each connecting pin is respectively connected to the inner end of a pull rod;

[0012] The energy storage wheel is a hollow cylindrical shape, and has two circular connecting rings on the inner wall of the wheel along the horizontal direction. The outer edge of each connecting ring is connected to the energy storage wheel as a whole, and a plurality of positioning pins are provided between two adjacent connecting rings along the vertical direction around the axis of the rotating shaft. The upper and lower ends of each positioning pin are respectively inserted and fixed on the corresponding connecting ring, and the outer end of each pull rod is respectively installed and connected to a corresponding positioning pin.

[0013] The high-power flywheel energy storage device for energy storage and peak regulation of the present invention, wherein a plurality of load-bearing brackets are installed on the rotating shaft, a storage wheel is respectively provided at the top of each load-bearing bracket, each storage wheel is respectively arranged cocentrically with the rotating shaft, the lower part of each storage wheel is respectively positioned and connected to the corresponding load-bearing bracket through a dovetail groove structure, the gravity received by each storage wheel all acts on the corresponding load-bearing bracket, and each storage wheel is respectively connected to the rotating shaft through a plurality of pull rods.

[0014] The high-power flywheel energy storage device for energy storage and peak regulation of the present invention, wherein the dovetail groove structure includes a convex ridge protruding radially downward at the bottom end of the energy storage wheel, the cross-section of the convex ridge is a trapezoid with a narrow top and a wide bottom, the top of the convex ridge is connected to the bottom end of the energy storage wheel as a whole, and a trapezoidal guide groove is provided radially on the top end face of the load-bearing bracket, and the convex ridge is inserted into the guide groove on the top end face of the load-bearing bracket by clearance fit.

[0015] The high-power flywheel energy storage device for energy storage and peak regulation of the present invention, wherein the cross-section of the vacuum chamber is circular, and the top of the vacuum chamber is an arc with the middle part arched upward; the vacuum chamber is made of concrete, and an isolation layer is provided on the wall of the vacuum chamber to prevent air from infiltrating, and the upper and lower ends of the rotating shaft are respectively mounted on the frame through magnetic bearings.

[0016] In the high-power flywheel energy storage device for energy storage and peak regulation of the present invention, the number of the dovetail groove structures arranged along the radial direction is 3-12.

[0017] The number of the dovetail groove structures arranged along the radial direction is 4-8.

[0018] The high-power flywheel energy storage device for energy storage and peak regulation of the present invention has each tie rod made of carbon fiber composite material, and the tensile strength of the high-strength carbon fiber composite material far exceeds the tensile strength of various high-strength alloy steels. In terms of force, each tie rod is only subjected to tension, not pressure or lateral shear force, that is, the torque transmitted by the rotating shaft to drive the energy storage wheel to rotate is not transmitted to the energy storage wheel through each tie rod, and the kinetic energy of the energy storage wheel rotation is not transmitted to the rotating shaft and the generator motor through each tie rod, but each tie rod is only subjected to tension. In this way, the advantage of high-strength carbon fiber composite material in tensile strength can be fully utilized. The energy storage wheel and the load-bearing bracket are positioned and connected through the dovetail groove structure because in the process of the energy storage wheel accelerating from static to high-speed rotation, the diameter of the cylindrical energy storage wheel will expand and enlarge along the radial direction, and the positioning connection of the dovetail groove structure can not only enable the load-bearing bracket to transmit the torque to the energy storage wheel, but also prevent the energy storage wheel from jumping along the axial direction of the shaft, and allow the diameter of the cylindrical energy storage wheel to expand and enlarge along the radial direction, so that the large-diameter high-speed energy storage flywheel can eliminate the internal stress concentration of the flywheel through the elastic deformation of a larger size, thereby avoiding the damage of related parts caused by the huge stress. At the same time, the gravity of the energy storage wheel is not offset by the various pull rods. The gravity of the energy storage wheel is borne by the load-bearing bracket and transmitted to the shaft, and the torque driving the energy storage wheel is driven by the shaft to drive the load-bearing bracket to rotate, and the load-bearing bracket drives the energy storage wheel to rotate through the dovetail groove structure, and the energy storage wheel obtains kinetic energy. Thus, the mass of the energy storage wheel made of metal material can be increased to a very high value, and at the same time, the energy storage wheel can withstand an extremely high rotation speed, that is, the energy storage wheel can stably maintain a higher rotation speed. Therefore, the high-power flywheel energy storage device for energy storage peak regulation of the present invention has the characteristics of allowing the large-diameter high-speed energy storage flywheel to eliminate the internal stress concentration of the flywheel through the elastic deformation of a larger size, high energy storage energy density, huge total energy value of energy storage, and is very suitable for large-scale storage of peak power generation of solar power generation systems, wind power generation systems, hydropower, thermal power generation systems and other power generation systems, and has the characteristics of low investment and long service life.

[0019] The specific implementation modes of the present invention are further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a front cross-sectional view of a high-power flywheel energy storage device for energy storage and peak regulation that can use the present invention;

[0021] Figure 2 yes Figure 1 A top view of

[0022] Figure 3It is a front cross-sectional view of another embodiment of the high-power flywheel energy storage device for energy storage and peak regulation of the present invention;

[0023] Figure 4 It is an enlarged cross-sectional view of the guide chute portion of the high-power flywheel energy storage device for energy storage and peak regulation of the present invention. DETAILED DESCRIPTION

[0024] When a large-diameter energy storage flywheel rotates at a high speed, each tiny mass unit of the flywheel will be subjected to a great centrifugal force. At the same time, the metal material constituting the flywheel is not a true, ideal rigid body, but a metal material that will produce elastic deformation when subjected to force. The energy storage flywheel of the present invention is to enable the large-diameter energy storage flywheel to produce elastic deformation movement when subjected to force under the centrifugal force at a high speed, so as to reduce the damage such as cracks inside the metal material of the flywheel caused by the stress concentration inside the flywheel.

[0025] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the high-power flywheel energy storage device for energy storage and peak regulation of the present invention includes a rotating shaft 2 rotatably mounted on a frame (not shown in the figure), the axis of the rotating shaft 2 is located in the vertical direction, a load-bearing bracket 3 is mounted on the rotating shaft 2, the load-bearing bracket 3 is made of metal or carbon fiber composite material, an energy storage runner 4 made of metal material is arranged on the load-bearing bracket 3, the energy storage runner 4 is arranged concentrically with the rotating shaft 2, the energy storage runner 4 and the load-bearing bracket 3 are positioned and connected by a plurality of dovetail groove structures arranged radially, the dovetail groove structure includes a convex ridge 5 protruding radially downward at the bottom end of the energy storage runner 4, the cross-section of the convex ridge 5 is a trapezoid with a narrow top and a wide bottom, the top of the convex ridge 5 is connected to the bottom end of the energy storage runner 4 as a whole, a trapezoidal guide groove 13 is radially arranged on the top end face of the load-bearing bracket 3, and the convex ridge 5 is inserted into the guide groove 13 on the top end face of the load-bearing bracket 3 by clearance fit.

[0026] The energy storage runner 4 and the load-bearing bracket 3 are positioned and connected via the dovetail groove structure because in the process of the energy storage runner 4 accelerating from a stationary state to a high-speed rotation, the diameter size of the cylindrical energy storage runner 4 will expand and enlarge along the radial direction, thereby allowing the large-diameter high-speed energy storage flywheel to eliminate the stress concentration inside the flywheel through a larger elastic deformation. The positioning connection of the dovetail groove structure can not only enable the load-bearing bracket 3 to transmit the torque to the energy storage runner 4, but also prevent the energy storage runner 4 from jumping along the axial direction of the rotating shaft 2, and also allow the diameter size of the cylindrical energy storage runner 4 to expand and enlarge along the radial direction, thereby avoiding the huge stress effect that causes damage to related parts.

[0027] The gravity exerted on the energy storage wheel 4 acts on the load-bearing bracket 3. The energy storage wheel 4 is connected to the rotating shaft 2 through multiple tie rods 6. The multiple tie rods 6 are arranged around the rotating shaft 2 along the radial direction of the rotating shaft 2. The tie rods 6 are made of carbon fiber composite material. The tensile strength of this high-strength carbon fiber composite material is as high as 8.27Gpa.

[0028] The pull rod 6 made of carbon fiber composite material is installed and connected to the energy storage wheel 4, and the pull rod 6 is installed and connected to the rotating shaft 2, which can give full play to the great advantage of carbon fiber composite material in tensile strength, while reducing stress concentration, thereby allowing the energy storage wheel 4 to stably maintain a higher rotation speed.

[0029] One end of the rotating shaft 2 is connected to the generator motor 8 by transmission, and the energy storage wheel 4, the load-bearing bracket 3, the plurality of tie rods 6 and the generator motor 8 are placed in the vacuum chamber 7. The main function of the vacuum chamber 7 is to provide a vacuum environment to reduce the windage loss of the entire high-power flywheel energy storage device for energy storage and peak regulation during operation.

[0030] The generator motor 8 is also called an electric / generator reciprocal bidirectional motor. The flywheel energy storage system converts and stores the electric energy and the mechanical kinetic energy of the high-speed running energy storage wheel 4 through the electric / generator reciprocal bidirectional motor, and interfaces with different types of loads through frequency modulation, rectification, and constant voltage.

[0031] During energy storage, the electric energy is converted by the power converter to drive the generator motor 8 to run, and the generator motor 8 drives the energy storage wheel 4 to accelerate the rotation. The energy storage wheel 4 stores the energy in the form of kinetic energy, completing the energy storage process of converting electric energy into mechanical energy. The energy is stored in the high-speed rotating energy storage wheel 4, and the generator motor 8 maintains a constant speed until it receives a control signal for energy release; during energy release, the high-speed rotating energy storage wheel 4 drives the generator motor 8 to generate electricity, and the power converter outputs the current and voltage suitable for the load, completing the energy release process of converting mechanical energy into electric energy. The entire flywheel energy storage system realizes the input, storage and output process of electric energy.

[0032] As a further improvement of the present invention, the above-mentioned load-bearing bracket 3 includes a circular tray 9 and a plurality of inclined rods 19, and the plurality of inclined rods 19 are arranged around the tray 9, and the inclined upper end of each inclined rod 19 is respectively fixedly connected to the upper part of the rotating shaft 2, and the inclined lower end of each inclined rod 19 is respectively fixedly connected to the middle part or the outer edge of the tray 9.

[0033] As a further improvement of the present invention, a plurality of oblique support rods (not shown in the figure) are arranged around the bottom of the above-mentioned tray 9, and the oblique lower end of each oblique support rod is fixedly connected to the lower part of the rotating shaft 2, and the oblique upper end of each oblique support rod is fixedly connected to the middle part or the outer edge of the tray 9.

[0034] As a further improvement of the present invention, the pull rod 6 is connected to the energy storage wheel 4 by an enlarged head anchor rod anchoring structure, and the pull rod 6 is connected to the rotating shaft 2 by an enlarged head anchor rod anchoring structure.

[0035] As a further improvement of the present invention, the outer side wall of the rotating shaft 2 is provided with two circular rings 11 along the horizontal direction, each circular ring 11 is connected to the rotating shaft 2 as a whole, and a plurality of connecting pins 12 are provided between two adjacent circular rings 11 along the vertical direction around the axis of the rotating shaft 2, and the upper and lower ends of each connecting pin 12 are respectively inserted and fixed on the corresponding circular ring 11, and each connecting pin 12 is respectively installed and connected to the inner end of a pull rod 5;

[0036] The energy storage wheel 4 is a hollow cylindrical shape, and has two circular connecting rings 14 on the inner wall of the wheel 4 along the horizontal direction. The outer edge of each connecting ring 14 is connected to the energy storage wheel 4 as a whole, and a plurality of positioning pins 15 are provided between two adjacent connecting rings 14 along the vertical direction around the axis of the rotating shaft 2. The upper and lower ends of each positioning pin 15 are respectively inserted and fixed on the corresponding connecting ring 14, and the outer end of each pull rod 5 is respectively installed and connected to a corresponding positioning pin 15.

[0037] As a further improvement of the present invention, a plurality of load-bearing brackets 3 are installed on the above-mentioned rotating shaft 2, and an energy storage wheel 4 is respectively provided at the top of each load-bearing bracket 3, and each energy storage wheel 4 is respectively arranged concentrically with the rotating shaft 2. The lower part of each energy storage wheel 4 is respectively positioned and connected with the corresponding load-bearing bracket 3 through a plurality of dovetail groove structures arranged along the radial direction, and the gravity received by each energy storage wheel 4 is all applied to the corresponding load-bearing bracket 3, and each energy storage wheel 4 is respectively connected with the rotating shaft 2 through a plurality of tie rods 6. The dovetail groove structure includes a convex ridge 5 protruding radially downward at the bottom end of the energy storage wheel 4, and the cross section of the convex ridge 5 is a trapezoid with a narrow top and a wide bottom, and the top of the convex ridge 5 is connected to the bottom end of the energy storage wheel 4 as a whole, and a trapezoidal guide groove 13 is provided radially on the top end face of the load-bearing bracket 3, and the convex ridge 5 is inserted into the guide groove 13 on the top end face of the load-bearing bracket 3 by a clearance fit.

[0038] As a further improvement of the present invention, the cross section of the vacuum chamber 7 is circular, and the top of the vacuum chamber 7 is an arc with the middle portion arched upward.

[0039] As a further improvement of the present invention, the vacuum chamber 7 is made of concrete, and an isolation layer (not shown) is provided on the wall of the vacuum chamber 7 to prevent air from penetrating. The upper and lower ends of the rotating shaft 2 are respectively mounted on the frame through magnetic bearings (not shown). The upper and lower ends of the rotating shaft 2 are respectively mounted on the frame through magnetic bearings, which can reduce friction when the energy storage wheel 4 rotates, reduce mechanical loss, and improve energy storage efficiency.

[0040] As a further improvement of the present invention, the number of the dovetail groove structures arranged along the radial direction is 3-12.

[0041] As a further improvement of the present invention, the number of the dovetail groove structures arranged along the radial direction is 4-8.

[0042] Flywheel energy storage refers to a method of energy storage that uses an electric motor to drive a flywheel to rotate at high speed, and then uses the flywheel to drive a generator to generate electricity when needed. Energy storage flywheels have broad application prospects in aerospace (satellite energy storage batteries, integrated power and attitude control), military (high-power electromagnetic guns), electricity (power peak regulation), communications (UPS), automotive industry (electric vehicles) and other fields.

[0043] The kinetic energy of a flywheel is proportional to its moment of inertia when it rotates. The moment of inertia of a flywheel is proportional to the square of its diameter and its mass. In order to prevent a large, heavy flywheel from being subjected to a centrifugal force that exceeds the ultimate strength of the flywheel material when it rotates at high speed, the kinetic energy of the flywheel can be increased by increasing its moment of inertia.

[0044] The flywheel in the flywheel energy storage device is a pure mechanical motion. The kinetic energy of the flywheel when it rotates is:

[0045] Kinetic energy stored in the flywheel

[0046] E f =1 / 2Iω 2

[0047] E f = Kinetic energy stored in the flywheel (Nm, J)

[0048] I = moment of inertia of the flywheel (kg m 2 )

[0049] ω = angular velocity of the flywheel (rad / s)

[0050] The high-power flywheel energy storage device for energy storage and peak regulation of the present invention has each tie rod 6 made of carbon fiber composite material, and the tensile strength of the high-strength carbon fiber composite material can be as high as 8.27Gpa, far exceeding the tensile strength of various high-strength alloy steels. In terms of force, each tie rod 6 is only subjected to tension, not pressure or lateral shear force, that is, the torque transmitted by the rotating shaft 2 to drive the energy storage wheel 4 to rotate is not transmitted to the energy storage wheel 4 through each tie rod 6, and the kinetic energy of the energy storage wheel 4 is not transmitted to the rotating shaft 2 and the generator motor 8 through each tie rod 6, but only each tie rod 6 is subjected to tension. Carbon fiber has a small specific gravity and low density of only 1800kg / cubic meter, which can fully play the advantages of high-strength carbon fiber composite materials in tensile strength. The present invention allows the energy storage wheel 4 to be positioned and connected to the load-bearing bracket 3 through a dovetail groove structure because in the process of the energy storage wheel 4 accelerating from a stationary state to a high-speed rotation, the diameter size of the cylindrical energy storage wheel 4 will expand and enlarge along the radial direction, and the positioning connection of the dovetail groove structure can not only enable the load-bearing bracket 3 to transmit the torque to the energy storage wheel 4, but also prevent the energy storage wheel 4 from jumping along the axial direction of the rotating shaft 2, and also allow the diameter size of the cylindrical energy storage wheel 4 to expand and enlarge along the radial direction, thereby allowing the large-diameter high-speed energy storage flywheel to eliminate the internal stress concentration of the flywheel through a larger-sized elastic deformation, thereby avoiding the occurrence of huge stress effects that cause damage to related components. At the same time, the gravity on the energy storage wheel 4 is not offset by the pull rods 6. The gravity on the energy storage wheel 4 is borne by the load-bearing bracket 3 and transmitted to the rotating shaft 2, and the torque driving the energy storage wheel 4 is driven by the rotating shaft 2 to drive the load-bearing bracket 3 to rotate, and the load-bearing bracket 3 then drives the energy storage wheel 4 to rotate through the dovetail groove structure, and allows the energy storage wheel 4 to obtain kinetic energy. In this way, the mass of the energy storage wheel 4 made of metal material can be increased to a very high value, and the energy storage wheel 4 can withstand an extremely high rotation speed. Therefore, the high-power flywheel energy storage device for energy storage peak regulation of the present invention has the characteristics of allowing a large-diameter high-speed energy storage flywheel to eliminate the internal stress concentration of the flywheel through a larger elastic deformation, high energy storage energy density, huge total energy value of energy storage, and is very suitable for large-scale storage of peak power generation of solar power generation systems, wind power generation systems, hydropower, thermal power generation systems and other power generation systems, and has the characteristics of low investment and long service life.

[0051] The embodiments described above are merely descriptions of preferred implementations of the present invention and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary engineers and technicians in the field should all fall within the scope of protection determined by the claims of the present invention.

Claims

1. A high-power flywheel energy storage device for energy storage and peak regulation, characterized by: The invention comprises a rotating shaft (2) rotatably mounted on a frame, the axis of the rotating shaft (2) being located in a vertical direction, a load-bearing bracket (3) being mounted on the rotating shaft (2), an energy storage rotating wheel (4) made of a metal material being arranged on the load-bearing bracket (3), the energy storage rotating wheel (4) being arranged cocentrically with the rotating shaft (2), and the energy storage rotating wheel (4) and the load-bearing bracket (3) being positioned and connected via a plurality of dovetail groove structures arranged along the radial direction; The gravity exerted on the energy storage wheel (4) acts on the load-bearing bracket (3); the energy storage wheel (4) is connected to the rotating shaft (2) via a plurality of tie rods (6); the plurality of tie rods (6) surround the rotating shaft (2) and are arranged along the radial direction of the rotating shaft (2); the tie rods (6) are made of carbon fiber composite material; The rotating shaft (2) is transmission-connected to the generator motor (8); the energy storage wheel (4), the load-bearing bracket (3), a plurality of pull rods (6) and the generator motor (8) are placed in a vacuum chamber (7).

2. The high-power flywheel energy storage device for energy storage and peak regulation according to claim 1 is characterized in that: The load-bearing support (3) comprises a circular tray (9) and a plurality of inclined tie rods (19), wherein the plurality of inclined tie rods (19) are arranged around the tray (9), the inclined upper end of each inclined tie rod (19) is fixedly connected to the upper part of the rotating shaft (2), and the inclined lower end of each inclined tie rod (19) is fixedly connected to the middle part or the outer edge of the tray (9).

3. The high-power flywheel energy storage device for energy storage and peak regulation according to claim 2 is characterized in that: A plurality of oblique support rods are arranged around the bottom of the tray (9), the oblique lower end of each oblique support rod being fixedly connected to the lower part of the rotating shaft (2), and the oblique upper end of each oblique support rod being fixedly connected to the middle part or the outer edge of the tray (9).

4. The high-power flywheel energy storage device for energy storage and peak regulation according to claim 3 is characterized in that: The pull rod (6) is connected to the energy storage wheel (4) by using an enlarged head anchor rod anchoring structure, and the pull rod (6) is connected to the rotating shaft (2) by using an enlarged head anchor rod anchoring structure.

5. The high-power flywheel energy storage device for energy storage and peak regulation according to claim 4 is characterized in that: The outer wall of the rotating shaft (2) is provided with two circular rings (11) along the horizontal direction, each circular ring (11) is connected to the rotating shaft (2) as a whole, and a plurality of connecting pins (12) are provided between two adjacent circular rings (11) along the vertical direction around the axis of the rotating shaft (2), and the upper and lower ends of each connecting pin (12) are respectively inserted and fixed on the corresponding circular ring (11), and each connecting pin (12) is respectively connected to the inner end of a pull rod (5); The energy storage wheel (4) is in the shape of a hollow cylinder. Two circular connecting rings (14) are provided on the inner wall of the wheel (4) along the horizontal direction. The outer edge of each connecting ring (14) is connected to the energy storage wheel (4) as a whole. A plurality of positioning pins (15) are provided between two adjacent connecting rings (14) along the vertical direction around the axis of the rotating shaft (2). The upper and lower ends of each positioning pin (15) are respectively inserted and fixed on the corresponding connecting ring (14). The outer end of each pull rod (5) is respectively connected to a corresponding positioning pin (15).

6. The high-power flywheel energy storage device for energy storage and peak regulation according to any one of claims 1 to 5, characterized in that: A plurality of load-bearing brackets (3) are mounted on the rotating shaft (2), and an energy storage wheel (4) is provided at the top of each load-bearing bracket (3). Each energy storage wheel (4) is arranged cocentrically with the rotating shaft (2), and the lower part of each energy storage wheel (4) is positioned and connected to the corresponding load-bearing bracket (3) via a plurality of dovetail groove structures. The gravity received by each energy storage wheel (4) is fully applied to the corresponding load-bearing bracket (3), and each energy storage wheel (4) is connected to the rotating shaft (2) via a plurality of pull rods (6).

7. The high-power flywheel energy storage device for energy storage and peak regulation according to claim 6 is characterized in that: The dovetail groove structure comprises a ridge (5) protruding radially downward at the bottom end of the energy storage wheel (4); the cross section of the ridge (5) is a trapezoid with a narrow top and a wide bottom; the top end of the ridge (5) is integrally connected to the bottom end of the energy storage wheel (4); a trapezoidal guide groove (13) is radially provided on the top end face of the load-bearing bracket (3); the ridge (5) is inserted into the guide groove (13) on the top end face of the load-bearing bracket (3) by means of clearance fit.

8. The high-power flywheel energy storage device for energy storage and peak regulation according to claim 7 is characterized in that: The cross section of the vacuum chamber (7) is circular, and the top of the vacuum chamber (7) is an arc with the middle part arched upward; the vacuum chamber (7) is made of concrete, and an isolation layer is provided on the wall of the vacuum chamber (7) to prevent air from penetrating; the upper and lower ends of the rotating shaft (2) are respectively mounted on the frame through magnetic bearings.

9. The high-power flywheel energy storage device for energy storage and peak regulation according to claim 8 is characterized in that: The number of the dovetail groove structures arranged along the radial direction is 3-12.

10. The high-power flywheel energy storage device for energy storage and peak regulation according to claim 9, characterized in that: The number of the dovetail groove structures arranged along the radial direction is 4-8.

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