Flywheel energy storage device

Abstract

The invention provides a flywheel energy storage device, which relates to the technical field of flywheel energy storage and comprises a central rotating shaft, an inner-layer flywheel, an outer-layer flywheel and a telescopic rod, the telescopic rods are uniformly distributed between the inner-layer flywheel and the outer-layer flywheel; the central rotating shaft is arranged in the inner layer flywheel; the telescopic rod specifically comprises an inner sleeve, a hollow screw rod and a synchronous control system; the hollow screw rod drives the outer flywheel to move through threads; the inner sleeve is hinged with the central rotating shaft; the outer-layer flywheel comprises a plurality of flywheel modules, and the flywheel modules are symmetrically arranged; each flywheel module is connected with the inner layer flywheel through the telescopic rod; when the flywheel energy storage device rotates, the synchronous control system controls the telescopic rods to extend, all the flywheel modules move towards the outer side along the radial sliding rails, the effective rotating radius of the flywheel energy storage device is increased, and energy storage of the flywheel energy storage device is improved.

Description

Technical Field

[0001] This invention relates to the field of flywheel energy storage technology, and in particular to a flywheel energy storage device. Background Technology

[0002] Flywheel energy storage devices are energy storage systems that use a high-speed rotating flywheel to convert electrical energy into mechanical energy and then release the mechanical energy back into electrical energy when needed. Flywheel energy storage devices have the characteristics of fast response speed, long cycle life, and high power density. They can be widely used in scenarios such as grid frequency regulation, renewable energy smoothing output, and instantaneous power compensation. They are a highly efficient mechanical energy storage method.

[0003] With the increasing proportion of new energy grid connection and the growing demand for dynamic regulation of the power system, traditional chemical battery energy storage faces numerous limitations in terms of lifespan, safety, and energy density. Developing flywheel energy storage devices can effectively compensate for these shortcomings, achieving efficient energy storage and rapid response through mechanical means, while avoiding chemical degradation and environmental pollution problems.

[0004] However, existing flywheel energy storage devices generally suffer from fixed rotational inertia and limited energy density. Their energy storage capacity mainly relies on increasing rotational speed. However, as the rotational speed increases, the centrifugal stress at the flywheel rim increases sharply. Due to the dual limitations of material strength and structural safety, it is difficult to further improve the energy storage level. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the purpose of this invention is to provide a flywheel energy storage device that can solve the problems of fixed moment of inertia and limited energy density in existing flywheel energy storage devices. The energy storage capacity mainly relies on increasing the rotational speed, but as the rotational speed increases, the centrifugal stress at the flywheel rim increases sharply. Due to the dual limitations of material strength and structural safety, it is difficult to further improve the energy storage level.

[0006] This invention provides a flywheel energy storage device, comprising: a central rotating shaft, an inner flywheel, an outer flywheel, and a telescopic rod; The telescopic rods are evenly distributed between the inner flywheel and the outer flywheel; The central rotating shaft is located inside the inner flywheel; The telescopic rod specifically includes: an inner sleeve, a hollow screw, and a synchronous control system; The hollow screw drives the outer flywheel to move via a thread; The inner sleeve is hinged to the central rotating shaft; The outer flywheel includes multiple flywheel modules, and each flywheel module is arranged symmetrically. Each of the aforementioned flywheel modules is connected to the inner flywheel via the telescopic rod; When the flywheel energy storage device rotates, the synchronous control system controls the extension rod to extend, and each flywheel module moves outward along the radial slide rail, increasing the effective rotation radius of the flywheel energy storage device and improving the energy storage capacity of the flywheel energy storage device.

[0007] The beneficial effects of the technical solutions provided in the embodiments of the present invention include at least the following: In this embodiment of the invention, by setting up an inner and outer double-layer flywheel structure and uniformly arranging controllable telescopic rods between them, the outer flywheel is driven to move synchronously along the radial slide rail, thereby achieving dynamic adjustment of the flywheel's rotational inertia. During the flywheel's rotation, the synchronous control system adjusts the extension of each telescopic rod in real time, causing the outer flywheel module to expand symmetrically and increase the effective rotation radius. This significantly improves the flywheel's energy storage and energy density without increasing the rotational speed, avoiding the material strength and friction loss problems caused by ultra-high-speed rotation, and ensuring the system's balance and stability. Attached Figure Description

[0008] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts. Obviously, the drawings described below are merely some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0009] Figure 1 This is a schematic diagram of a flywheel energy storage device provided in an embodiment of the present invention.

[0010] Explanation of reference numerals in the attached diagram: 1-Central pivot; 2-Inner flywheel; 3-Outer flywheel; 4-Telescopic rod. Detailed Implementation

[0011] To enable those skilled in the art to better understand the technical solutions in the embodiments of the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. It should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0012] Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concepts disclosed in this invention.

[0013] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention.

[0014] Reference manual attached Figure 1 The structure of a flywheel energy storage device provided in this embodiment of the invention includes: a central rotating shaft 1, an inner flywheel 2, an outer flywheel 3, and a telescopic rod 4.

[0015] The telescopic rod 4 is evenly distributed between the inner flywheel 2 and the outer flywheel 3.

[0016] The central rotating shaft 1 is located inside the inner flywheel 2.

[0017] The telescopic rod 4 specifically includes: an inner sleeve, a hollow screw, and a synchronous control system.

[0018] The hollow screw drives the outer flywheel 3 to move through the thread.

[0019] The inner sleeve is hinged to the central rotating shaft 1.

[0020] The outer flywheel 3 includes multiple flywheel modules, which are arranged symmetrically.

[0021] Each flywheel module is connected to the inner flywheel 2 via a telescopic rod 4.

[0022] When the flywheel energy storage device rotates, the synchronous control system controls the extension rod 4 to extend, and each flywheel module moves outward along the radial slide rail, increasing the effective rotation radius of the flywheel energy storage device and improving the energy storage capacity of the flywheel energy storage device.

[0023] The beneficial effects of the technical solutions provided in the embodiments of the present invention include at least the following: In this embodiment of the invention, by setting up an inner and outer double-layer flywheel structure and uniformly arranging controllable telescopic rods between them, the outer flywheel is driven to move synchronously along the radial slide rail, thereby achieving dynamic adjustment of the flywheel's rotational inertia. During the flywheel's rotation, the synchronous control system adjusts the extension of each telescopic rod in real time, causing the outer flywheel module to expand symmetrically and increase the effective rotation radius. This significantly improves the flywheel's energy storage and energy density without increasing the rotational speed, avoiding the material strength and friction loss problems caused by ultra-high-speed rotation, and ensuring the system's balance and stability.

[0024] In one possible implementation, a corrugated protective cover is also included.

[0025] A corrugated protective cover is installed on the outside of the telescopic rod 4 to prevent contamination and wear of the telescopic rod 4.

[0026] Among them, the corrugated protective cover is a protective kit with a flexible corrugated structure. It is usually made of wear-resistant and high-temperature resistant metal or composite material. It is fitted on the outside of the telescopic rod to prevent external dust, oil and impurities from entering the transmission mechanism during the reciprocating motion of the telescopic rod, and to avoid wear or jamming of sliding parts.

[0027] It should be noted that by installing a corrugated protective cover on the outside of the telescopic rod, dust and foreign objects can be effectively prevented from contaminating the telescopic structure, avoiding lubrication failure and accelerated wear, thereby improving the service life and movement stability of the telescopic rod. At the same time, the corrugated protective cover can maintain good sealing and flexibility during the telescopic process, ensuring that the device still has reliable protective performance and long-term structural durability under high-speed operation.

[0028] In one possible implementation, it also includes: a redundant elastic secondary rod.

[0029] The redundant flexible secondary rod is located between the inner flywheel 2 and the outer flywheel 3.

[0030] The redundant elastic joint is parallel to the telescopic rod 4. The redundant elastic joint is used to prevent the outer flywheel 3 from flying off in the event of a breakage of the telescopic rod 4.

[0031] The redundant elastic auxiliary rod is an elastic support component arranged parallel to the main telescopic rod. It is typically made of high-toughness metal or composite materials, possessing a certain degree of flexibility and tensile strength. When the main telescopic rod breaks due to fatigue, impact, or mechanical failure, the auxiliary rod can instantly bear the centrifugal force of the outer flywheel, preventing the flywheel module from detaching from the inner flywheel structure and ensuring the overall safety of the system. By setting a redundant elastic auxiliary rod between the inner and outer flywheels, emergency support can be provided in the event of accidental breakage or failure of the telescopic rod, preventing structural damage or safety accidents caused by the outer flywheel detaching.

[0032] In one possible implementation, it also includes: a ring-shaped hinge seat.

[0033] The annular hinge seat is installed on the inner flywheel 2 and is used to connect the inner flywheel 2 and the telescopic rod 4.

[0034] Specifically, the annular hinge seat is a ring-shaped structural component installed on the outer edge of the inner flywheel. It provides evenly distributed hinge points for multiple telescopic rods. The hinge seat is typically made of high-strength alloy material, possessing excellent torsional and fatigue resistance, and can maintain the adaptive angle and balanced force of the telescopic rods during rotation. By setting the annular hinge seat on the inner flywheel, multiple telescopic rods can maintain precise symmetry and stable support during installation and movement, ensuring the consistency of force and coordination of movement when the outer flywheel radially extends and retracts.

[0035] In one possible implementation, it also includes: a rigid base and a flange.

[0036] The rigid base is located inside the outer flywheel 3.

[0037] The flange is located at the end of the telescopic rod 4 and is connected to the rigid base. The flange is used to connect the telescopic rod 4 and the rigid base.

[0038] The rigid base is a high-strength support structure installed inside the outer flywheel to withstand the centrifugal load generated by the flywheel's rotation and maintain the overall deformation stability of the outer flywheel. The flange is a connecting component installed at the end of the telescopic rod, which is fixedly connected to the rigid base by bolts or threads to achieve efficient transmission of force and motion. By setting up a connection structure between the rigid base and the flange, stable mechanical support and precise positioning can be achieved when the telescopic rod drives the outer flywheel to move radially, effectively preventing loosening or deformation of the connection parts.

[0039] In one possible implementation, it also includes an acoustic resonance damping ring.

[0040] An acoustic resonance damping ring is placed between the central rotating shaft 1 and the inner flywheel 2. The acoustic resonance damping ring is used to suppress the vibration generated by the rotation of the flywheel.

[0041] The acoustic resonance damping ring is a ring-shaped vibration damping element installed between the central shaft and the inner flywheel. It is typically made of high-damping rubber, composite elastic materials, or multiple metal sandwich layers. It utilizes the acoustic-vibration coupling characteristics of the material to absorb and attenuate the resonant sound waves and mechanical vibrations generated during rotation. By placing an acoustic resonance damping ring between the central shaft and the inner flywheel, the vibration and noise generated during the high-speed rotation of the flywheel can be effectively absorbed, reducing structural fatigue and energy loss caused by resonance.

[0042] In one possible implementation, it also includes: a micro turbine generator set.

[0043] The micro turbine generator set is located inside the hollow screw.

[0044] A micro turbine generator set consists of coaxially connected turbine blades and a permanent magnet generator.

[0045] Micro turbine generator sets are used to convert the airflow generated by the rotation of a hollow screw into mechanical energy.

[0046] Specifically, a micro turbine generator set is an energy recovery device installed inside a hollow screw, consisting of coaxially arranged turbine blades and a permanent magnet generator. When the hollow screw rotates, the internal airflow drives the turbine blades to rotate, thereby driving the permanent magnet generator to generate electricity, converting aerodynamic energy into electrical energy and realizing energy reuse. By setting a micro turbine generator set inside the hollow screw, the airflow energy generated by high-speed rotation during flywheel operation can be effectively recovered, forming a mechanical-electrical energy coupling conversion mechanism.

[0047] In one possible implementation, the central rotating shaft 1 is made of hollow alloy steel and has an internal airflow channel for aerodynamic coupling with the micro turbine generator set.

[0048] It should be noted that by designing the central rotating shaft as a hollow alloy steel structure and setting an airflow channel inside it, efficient airflow guidance can be achieved while maintaining high strength and rigidity, forming a stable aerodynamic coupling with the micro turbine generator set.

[0049] In one possible implementation, the outer surface of the central shaft 1 is provided with a ceramic nano-coating, which is used to improve the surface hardness and wear resistance of the central shaft 1.

[0050] It should be noted that by setting a ceramic nano-coating on the outer surface of the central shaft, its surface hardness, wear resistance and corrosion resistance can be significantly improved, reducing friction and wear during long-term high-speed rotation. It can also effectively reduce surface roughness, improve dynamic balance and lubrication conditions, thereby extending the service life of the shaft and related transmission components, and ensuring that the flywheel energy storage device remains stable and efficient under high-intensity operating conditions.

[0051] In one possible implementation, it also includes a magnetic levitation support component.

[0052] The magnetic levitation support components are set at both ends of the central rotating shaft 1 to reduce frictional losses during the rotation of the flywheel energy storage device and improve energy conversion efficiency.

[0053] Specifically, by setting magnetic levitation support components at both ends of the central rotating shaft, contactless support can be achieved using magnetic force, which significantly reduces mechanical friction and bearing wear. This not only reduces energy loss and improves the smoothness of flywheel rotation and energy conversion efficiency, but also effectively suppresses vibration and noise, extends the service life of key system components, and ensures long-term stable operation of the device under high-speed conditions.

[0054] In this embodiment of the invention, when the system needs to handle high kinetic energy demands, the flywheel energy storage device adjusts the extension length of the telescopic rod in real time through an intelligent control system. According to the formula for calculating moment of inertia, I = m × r, where m is the mass of the outer flywheel module and r is the distance from the outer flywheel module to the center of rotation, when the telescopic rod extends, the outer flywheel module moves outward along the radial slide rail, significantly increasing the effective rotation radius r. Since moment of inertia is proportional to the square of the radius, this radial displacement can lead to an exponential increase in moment of inertia.

[0055] Combined with flywheel energy storage formula ω represents angular velocity. Under the same rotational speed, the energy storage capacity of the system can be increased quadratically simply by increasing the rotation radius r. For example, if the outer flywheel module is moved outward, increasing the maximum r to twice its original value, then I increases to four times, and the energy storage E also increases to four times, without needing to increase the rotational speed further. This dynamic adjustment mechanism perfectly matches high-energy-demand scenarios such as grid frequency regulation and high-power pulse loads, significantly improving instantaneous energy output capability while maintaining the safe rotational speed of the flywheel structure.

[0056] This invention encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of this invention. To provide the public with a thorough understanding of this invention, specific details are described in detail in the preferred embodiments, while those skilled in the art will fully understand the invention even without these details. Furthermore, to avoid unnecessary misunderstanding of the essence of this invention, well-known methods, processes, procedures, components, and circuits are not described in detail.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the protection scope of the present invention.

Claims

1. A flywheel energy storage device, characterized in that, include: The central pivot (1), inner flywheel (2), outer flywheel (3), and telescopic rod (4); The telescopic rod (4) is evenly distributed between the inner flywheel (2) and the outer flywheel (3); The central rotating shaft (1) is disposed inside the inner flywheel (2); The telescopic rod (4) specifically includes: an inner sleeve, a hollow screw, and a synchronous control system; The hollow screw drives the outer flywheel (3) to move via a thread; The inner sleeve is hinged to the central rotating shaft (1); The outer flywheel (3) includes multiple flywheel modules, and each flywheel module is arranged symmetrically. Each of the flywheel modules is connected to the inner flywheel (2) via the telescopic rod (4); When the flywheel energy storage device rotates, the synchronous control system controls the telescopic rod (4) to extend, and each flywheel module moves outward along the radial slide rail, increasing the effective rotation radius of the flywheel energy storage device and improving the energy storage capacity of the flywheel energy storage device.

2. The flywheel energy storage device according to claim 1, characterized in that, Also includes: Corrugated protective cover; The corrugated protective cover is installed on the outside of the telescopic rod (4) to prevent the telescopic rod (4) from being contaminated and worn.

3. The flywheel energy storage device according to claim 1, characterized in that, It also includes: redundant flexible joints; The redundant elastic secondary rod is disposed between the inner flywheel (2) and the outer flywheel (3); The redundant elastic joint is parallel to the telescopic rod (4), and the redundant elastic joint is used to prevent the outer flywheel (3) from flying off when the telescopic rod (4) breaks.

4. The flywheel energy storage device according to claim 1, characterized in that, Also includes: Annular hinge seat; The annular hinge seat is disposed on the inner flywheel (2), and the annular hinge seat is used to connect the inner flywheel (2) and the telescopic rod (4).

5. The flywheel energy storage device according to claim 1, characterized in that, Also includes: Rigid base and flange; The rigid base is disposed inside the outer flywheel (3); The flange is located at the end of the telescopic rod (4) and is connected to the rigid base. The flange is used to connect the telescopic rod (4) and the rigid base.

6. The flywheel energy storage device according to claim 1, characterized in that, Also includes: Acoustic resonance damping ring; The acoustic resonance damping ring is disposed between the central rotating shaft (1) and the inner flywheel (2), and the acoustic resonance damping ring is used to suppress the vibration generated by the rotation of the flywheel.

7. The flywheel energy storage device according to claim 1, characterized in that, Also includes: Miniature turbine generator set; The micro turbine generator set is disposed inside the hollow screw; The micro turbine generator set includes coaxially connected turbine blades and a permanent magnet generator; The micro turbine generator set is used to convert the airflow generated by the rotation of the hollow screw into mechanical energy.

8. The flywheel energy storage device according to claim 7, characterized in that, The central rotating shaft (1) adopts a hollow alloy steel structure and has an internal airflow channel for aerodynamic coupling with the micro turbine generator set.

9. The flywheel energy storage device according to claim 1, characterized in that, The outer surface of the central rotating shaft (1) is provided with a ceramic nano-coating, which is used to improve the surface hardness and wear resistance of the central rotating shaft (1).

10. The flywheel energy storage device according to claim 1, characterized in that, Also includes: Magnetic levitation support components; The magnetic levitation support assembly is located at both ends of the central rotating shaft (1) to reduce frictional losses during the rotation of the flywheel energy storage device and improve energy conversion efficiency.

Images