A safety protection device and method suitable for a flywheel energy storage system

Abstract

The application discloses a safety protection device and method suitable for a flywheel energy storage system, and belongs to the technical field of the flywheel energy storage system. The device comprises: an outer shell, a flywheel disc arranged in the outer shell and rotationally connected with the outer shell; a connecting block which is conductive and fixedly installed on the surface of the flywheel disc; and an electromagnetic deceleration ring arranged on the outer periphery of the outer shell and dampingly connected with the connecting block, so as to adjust the rotating speed of the flywheel disc. The connecting block and the electromagnetic deceleration ring are matched to non-contactingly adjust the rotating speed of the flywheel disc in time when the flywheel energy storage system is abnormal, so that the safety hidden danger possibly existing in the flywheel energy storage system is avoided.

Description

Technical Field

[0001] This invention belongs to the technical field of flywheel energy storage systems, and specifically relates to a safety protection device and safety protection method suitable for flywheel energy storage systems. Background Technology

[0002] Flywheel energy storage systems are highly efficient physical energy storage devices. Their core components consist of a high-speed rotating flywheel, a motor, and a power conversion system, achieving energy storage and release through the mutual conversion of electrical and kinetic energy. Utilizing carbon fiber flywheels and magnetic levitation technology, they can reach speeds of tens of thousands of revolutions per minute, offering significant advantages such as millisecond-level rapid response, long cycle life, and zero pollution. While flywheel energy storage systems store kinetic energy through a high-speed rotating flywheel, current technologies reveal that flywheels are prone to breakage under overload, shaft failure, or material fatigue, releasing enormous amounts of energy and threatening the safety of surrounding equipment and personnel. Currently, flywheel braking primarily relies on contact-based friction braking; however… The brake pads and brake discs experience physical friction during each braking action, leading to gradual material wear and requiring periodic replacement of brake pads / discs, increasing maintenance costs and downtime. The heat generated during friction is concentrated on the contact surface, potentially causing flywheel or shaft deformation, leading to breakage and the release of significant energy, threatening the safety of surrounding equipment and personnel. Inconsistent materials and rough surfaces can result in uneven friction, compromising high-speed rotation stability, increasing bearing load, and shortening lifespan. During overspeed protection, hydraulically or pneumatically driven friction braking systems exhibit mechanical delays, and slow response may miss the optimal braking opportunity. Particles generated from the friction and wear of brake materials can contaminate bearings, affect sensor accuracy, and even cause short circuits. Summary of the Invention

[0003] To address the problems existing in the prior art, the purpose of this invention is to provide a safety protection device and method suitable for flywheel energy storage systems, so as to prevent the flywheel from experiencing overload, shaft breakage, or material fatigue when storing kinetic energy through a high-speed rotating flywheel.

[0004] To solve the above-mentioned technical problems, the present invention is implemented as follows: In a first aspect, the present invention provides a safety protection device suitable for a flywheel energy storage system, wherein the flywheel energy storage system includes a flywheel disk and a motor, the motor being electrically connected to the flywheel disk, and the device includes: an outer shell, wherein the flywheel disk is disposed within the outer shell and rotatably connected to the outer shell; A connecting block, the connecting block being conductive and fixedly mounted on the surface of the flywheel disk; and An electromagnetic deceleration ring is disposed on the outer periphery of the outer casing and is dampedly connected to the connecting block to adjust the rotational speed of the flywheel.

[0005] Preferably, the device further includes a controller, wherein a speed sensor is disposed inside the flywheel disk, and the speed sensor is electrically connected to the controller to detect the rotational speed of the flywheel disk.

[0006] Preferably, a level sensor is installed on the top of the flywheel, and the level sensor is electrically connected to the controller to detect the levelness of the flywheel.

[0007] Preferably, the outer shell surface is provided with an isolation layer and a protective layer in sequence, and the outer shell, the isolation layer and the protective layer are detachably connected in sequence.

[0008] Preferably, the protective layer and the isolation layer are connected by bolts / screws, and the bolts / screws are threaded to the outer casing.

[0009] Preferably, the dimensions of the inner wall of the insulating layer are adapted to the dimensions of the outer shell surface; and / or The protective layer is a high-strength fiber layer.

[0010] Preferably, the device further includes: a plurality of mounting slots, wherein the plurality of mounting slots are mounted on the surface of the flywheel disk and are spaced apart around the outer periphery of the flywheel disk.

[0011] Preferably, the inner wall of the mounting groove is fixedly connected to the connecting block, and the dimensions of the connecting block surface are compatible with the dimensions of the inner wall of the mounting groove.

[0012] Preferably, the connecting block is an iron block.

[0013] Secondly, the present invention provides a safety protection method for a safety protection device applicable to a flywheel energy storage system. The safety protection method is as follows: when the rotational speed of the flywheel disk is detected to be abnormal by the speed sensor, the electromagnetic deceleration ring is activated by the controller. After the electromagnetic deceleration ring is activated, it generates a magnetic field. The magnetic field, in conjunction with the connecting block, generates a damping force to reduce the rotational speed of the flywheel disk.

[0014] The above technical solution has at least the following advantages compared with the existing technology: (1) The speed sensor can initially detect whether the flywheel has an abnormal rotation speed. If an abnormality occurs, such as material fatigue, the controller can start the electromagnetic deceleration ring to cooperate with the iron connecting block to reduce the speed and avoid possible breakage of the flywheel. (2) The level of the flywheel is detected by the level sensor and fed back to the controller. The controller can detect the abnormal level of the flywheel in time and promptly notify the maintenance personnel through the alarm light and / or alarm device to take measures to improve the operational reliability and stability of the flywheel and extend its service life. (3) The outer shell is equipped with a double-layer protective structure to avoid the risk of high-energy fragments flying out if the material breaks when the flywheel rotates at high speed. The first layer is an isolation layer made of a buffer material that can absorb the impact and dissipate the energy generated when the flywheel breaks. A high-strength fiber material protective layer is fixedly installed on the surface of the isolation layer so that the energy can be quickly isolated in the early stage of flywheel failure with the help of the protective layer to prevent the flywheel from breaking and the fragments from flying out. (4) The outer shell, protective layer and isolation layer are designed to be detachably connected. The protective layer and isolation layer are connected by several bolts or screws and are threaded to the outer shell. The bolts or screws can be removed to replace the protective layer and isolation layer separately and repair the outer shell separately, thereby reducing maintenance costs. Attached Figure Description

[0015] The accompanying drawings, which form part of this specification, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a structural schematic diagram of a safety protection device for a flywheel energy storage system provided by the present invention.

[0016] Figure 2 This invention provides a schematic diagram of the internal structure of a safety protection device suitable for flywheel energy storage systems.

[0017] Figure 3 This is another structural schematic diagram of a safety protection device for a flywheel energy storage system provided by the present invention.

[0018] Figure 4 for Figure 3 Enlarged diagram of point A.

[0019] Reference numerals: 1-Outer shell; 2-Flywheel disc; 3-Motor; 4-Connecting block; 5-Mounting slot; 6-Electromagnetic deceleration ring; 7-Controller; 8-Circuit board; 9-Alarm; 10-Alarm light; 11-Charging module; 12-Speed ​​sensor; 13-Level sensor; 14-Isolation layer; 15-Protective layer; 16-Fixing bolt. Detailed Implementation

[0020] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0021] The following detailed description is exemplary and intended to provide further detailed explanation of the invention. Unless otherwise specified, all technical terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this invention is for describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention.

[0022] This invention provides a safety protection device suitable for a flywheel energy storage system, wherein the flywheel energy storage system includes a motor 3 and a flywheel disk 2. The output end of the motor 3 is fixedly installed at one end of the flywheel disk 2. After the motor 3 is started, it controls the rotation of the flywheel disk 2, converting the motor 3 into a generator 3. The inertial rotation of the flywheel disk 2 controls the motor 3 to generate electricity. In this embodiment, see [reference needed]. Figure 2 The safety protection device includes an outer casing 1, and the motor 3 and the flywheel 2 are rotatably connected to the inner wall of the outer casing 1 by means of bearings. Multiple mounting slots 5 are evenly formed circumferentially on the outer edge surface of the flywheel disk 1. A high-permeability iron connecting block 4 can be fixedly installed on the inner wall of each mounting slot 5 by interference fit or threaded fastening. Correspondingly, an annular electromagnetic deceleration ring 6 is fixedly installed on the inner side of the outer casing 1, and its axis is coaxial with the rotation center of the flywheel disk 2.

[0023] See Figure 1 A controller 7, model JD1C-40, is fixedly mounted on the surface of the electromagnetic deceleration ring 6. This controller receives control commands and precisely regulates the current magnitude and on / off timing. When signs of breakage appear on the flywheel disc 2, the electromagnetic deceleration ring 6 generates a magnetic field. This magnetic field, in conjunction with the iron connecting block 4, quickly generates damping force to decelerate the flywheel disc 2, effectively improving the safety of the flywheel energy storage device and avoiding the safety hazards caused by the rotation of the flywheel disc 2 after breakage. The fixed installation method can be riveting, bolting, or screwing.

[0024] The rotational speed of the flywheel 2 can also be detected by a magnetoelectric or optical speed sensor 12 installed on the inner wall of the outer casing 1. One end of the speed sensor 12 is electrically connected to one end of the controller 7 via a wire. When there is an abnormality in the rotational speed, such as overspeed, sudden change in speed, or unstable oscillation, the controller 7 controls the electromagnetic deceleration ring 6 to start, so that the flywheel 2 decelerates.

[0025] Furthermore, to detect the levelness of the flywheel 2, several level sensors 13 can be fixedly installed on the top of the flywheel 2. One end of the level sensor 13 is electrically connected to one end of the controller 7 through a wire. When the level sensor 13 detects that the flywheel 2 is shaking or deviating, it promptly feeds back to the controller 7 to activate the electromagnetic deceleration ring 6 to decelerate or to provide early warning feedback to the maintenance personnel to avoid the centrifugal force impacting the bearing caused by the eccentricity of the flywheel 2.

[0026] Preferably, a circuit board 8 is fixedly mounted on the inner wall of the controller 7. An alarm 9, an alarm light 10, and a charging module 11 are fixedly mounted on the surface of the circuit board 8. The charging module 11 is used to supply power to the mechanism connected to the circuit board 8. If the controller 7 receives a fault or a sign of a fault, such as the rotational speed exceeding the safety threshold of 120% or the level deviation exceeding the limit, it can generate an audible and visual alarm using the alarm 9 and the alarm light 10 to sound an alarm when the flywheel 2 malfunctions, facilitating timely handling by maintenance personnel.

[0027] Reference Figures 3-4 An insulating layer 14 is installed on the surface of the outer shell 1. In one embodiment, the insulating layer 14 may be made of EPS foam as the core material and covered with Ni. 36 The sandwich structure formed by the CrTiAl alloy thin plate, in which Ni 36 The CrTiAl alloy layer has a thickness of 0.5-2mm, and the EPS core layer density is 15-30kg / m³, specifically 1mm and 25kg / m³ respectively. The isolation layer 14 can absorb the impact, thereby dissipating the energy carried by the fragments generated when the flywheel disk 2 breaks, effectively improving the safety of the flywheel disk energy storage system. Furthermore, a high-strength fiber protective layer 15 is fixedly installed on the surface of the isolation layer 14. The protective layer 15 can quickly isolate energy in the early stage of flywheel failure, preventing the flywheel disk 2 from breaking and its fragments from scattering, forming a physical barrier to ensure the safety of the system and the environment. The protective layer 15 and the surface of the isolation layer 14 are connected by several fixing bolts 16 or screws. The heads of the fixing bolts 16 can be designed with a quick-release structure (such as a butterfly or T-head), which can be manually disassembled without special tools. The surface of the fixing bolt 16 is threaded to the inside of the outer casing 1. The protective layer 15 and the isolation layer 14 are installed on the surface of the outer casing 1 by means of the fixing bolt 16. After the fixing bolt 16 is removed, the protective layer 15 and the isolation layer 14 are separated, which facilitates the maintenance of the outer casing 1 and the maintenance of the internal bearings or motor 3.

[0028] The implementation principle of the safety protection device applicable to the flywheel energy storage system is as follows: When an abnormality is detected by the speed sensor 12 or the level sensor 13, such as overspeed or eccentricity of the flywheel disk 2, timely feedback is given to the operation and maintenance personnel. Alternatively, the speed of the flywheel disk 2 is adjusted within milliseconds by the iron connecting block 4 installed on the fixing groove 5 on the surface of the flywheel disk 2 and the electromagnetic deceleration ring 6 installed on the surface of the outer shell 1. This avoids the safety hazards caused by the rotation of the flywheel disk 2 after it breaks. At the same time, the alarm light 10 and the alarm 9 provide timely audible and visual alarms. When the flywheel disk 2 breaks, the isolation layer 14 installed on the surface of the outer shell 1 absorbs and dissipates the energy generated by the breakage of the flywheel disk 2. Furthermore, the protective layer 15 made of high-strength fiber material prevents the fragments formed by the breakage of the flywheel disk 2 from flying out.

[0029] The present invention also provides a safety protection method for a safety protection device applicable to a flywheel energy storage system: when the rotational speed of the flywheel disk 2 is detected to be abnormal by the speed sensor 12, the electromagnetic deceleration ring 6 is activated by the controller 7. After the electromagnetic deceleration ring 6 is activated, it generates a magnetic field, and the magnetic field, together with the connecting block 4, generates a damping force to reduce the rotational speed of the flywheel disk 2.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A safety protection device for a flywheel energy storage system, the flywheel energy storage system comprising a flywheel disk and a motor, the motor being electrically connected to the flywheel disk, characterized in that, The device includes: The outer casing, wherein the flywheel is disposed within the outer casing and rotatably connected to the outer casing; A connecting block, the connecting block being conductive and fixedly mounted on the surface of the flywheel disk; and An electromagnetic deceleration ring is disposed on the outer periphery of the outer casing and is dampedly connected to the connecting block to adjust the rotational speed of the flywheel.

2. The safety protection device for flywheel energy storage systems according to claim 1, characterized in that, Also includes: The controller includes a speed sensor installed inside the flywheel disk, which is electrically connected to the controller to detect the rotational speed of the flywheel disk.

3. The safety protection device for flywheel energy storage systems according to claim 2, characterized in that, A level sensor is installed on the top of the flywheel, and the level sensor is electrically connected to the controller to detect the levelness of the flywheel.

4. The safety protection device for flywheel energy storage systems according to claim 1, characterized in that, The outer shell surface is provided with an isolation layer and a protective layer in sequence, and the outer shell, the isolation layer and the protective layer are detachably connected in sequence.

5. The safety protection device for flywheel energy storage systems according to claim 4, characterized in that, The protective layer and the isolation layer are connected by bolts / screws, and the bolts / screws are threaded to the outer casing.

6. The safety protection device for flywheel energy storage systems according to claim 4, characterized in that, The dimensions of the inner wall of the isolation layer are adapted to the dimensions of the outer shell surface; and / or The protective layer is a high-strength fiber layer.

7. The safety protection device for flywheel energy storage systems according to claim 1, characterized in that, Also includes: The mounting slots are multiple, and the multiple mounting slots are installed on the surface of the flywheel disk and are distributed at intervals around the outer periphery of the flywheel disk.

8. The safety protection device for flywheel energy storage systems according to claim 7, characterized in that, The inner wall of the mounting groove is fixedly connected to the connecting block, and the dimensions of the connecting block surface are compatible with the dimensions of the inner wall of the mounting groove.

9. The safety protection device for flywheel energy storage systems according to claim 1, characterized in that, The connecting block is an iron block.

10. A safety protection method for a safety protection device applicable to a flywheel energy storage system, characterized in that, Safety protection is achieved using the safety protection device as described in claim 1. The safety protection method is as follows: when the rotational speed of the flywheel is detected to be abnormal by the speed sensor, the electromagnetic deceleration ring is activated by the controller. After the electromagnetic deceleration ring is activated, it generates a magnetic field. The magnetic field, in conjunction with the connecting block, generates a damping force to reduce the rotational speed of the flywheel.

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