Modularized flywheel energy storage structure

Abstract

The invention belongs to the technical field of flywheel physical energy storage, and particularly relates to a modularized flywheel energy storage structure, which comprises a lateral sealing shell, a positioning coating sleeve, an integrated bunching tube and a resonance blocking ring, the positioning coating sleeve is arranged at the side end of the lateral sealing shell, the integrated bunching tube is arranged in the lateral sealing shell, and the resonance blocking ring is arranged at the upper end of the positioning coating sleeve. By arranging the flywheel energy storage mechanism, the bionic honeycomb expansion frame, the limiting inner ring, the embedding groove and the electromagnetic-hydraulic dual-mode coupler, when the flywheel energy storage mechanism works, the charging and power-generating integrated motor drives the hollow shaft to rotate, and the hollow shaft drives the axle connecting piece and the carbon fiber flywheel through supporting of the superconducting magnetic suspension bearing and the radial electromagnetic bearing. When the carbon fiber flywheel rotates at a high speed, energy storage is completed, and the transmission direction between kinetic energy and electric energy is converted through the charging and generating integrated motor. When the rotating speed of one flywheel energy storage unit is abnormal, the electromagnetic-hydraulic dual-mode coupler cuts off magnetic coupling and enables the flywheel energy storage unit to be converted into a free rotating mode.

Description

Technical Field

[0001] The present invention relates to the technical field of flywheel physical energy storage, and specifically to a modular flywheel energy storage structure. Background Art

[0002] A flywheel energy storage system realizes the mutual conversion of electrical energy and kinetic energy through a high-speed rotating flywheel rotor. Its core consists of a composite flywheel, magnetic levitation bearings, a high-efficiency motor / generator, and a vacuum chamber, and has the characteristics of millisecond-level response, millions of cycle life, and zero chemical pollution. Compared with chemical energy storage such as lithium batteries, flywheel energy storage has significant advantages in terms of high power density (up to 20 kW / kg) and instantaneous charge and discharge (>95% efficiency), and is particularly suitable for high-frequency and high-dynamic scenarios such as power grid frequency modulation and industrial braking energy recovery. At the same time, it avoids safety hazards such as electrolyte aging and thermal runaway, and is a key power-type energy storage technology in the clean energy system.

[0003] The prior art has the following defects or problems: In the "flywheel energy storage body structure" with the publication number of CN102082482A in the prior art, "symmetrically fixed on the upper and lower end faces inside the housing are stators composed of inner and outer annular permanent magnets. The upper and lower end faces of the inner and outer annular permanent magnets are magnetic poles with opposite polarities. The magnetic pole polarities of the annular permanent magnets corresponding to the upper and lower stators are symmetric. Disc-shaped rotors are fixed on the upper and lower end faces of the flywheel. The two disc-shaped rotors are electrically connected and insulated from the flywheel. Each rotor shaft is respectively supported by a high-speed bearing. An insulating support is provided between the high-speed bearing and the housing. Each high-speed bearing is respectively connected to a lead terminal."

[0004] By integrating the flywheel and the motor into one body, the above structure not only facilitates the structural design of the mass balance of each part of the body, but also simplifies the structure. However, when the flywheel structure rotates at high speed driven by the motor, a directional torque will be generated. A single flywheel energy storage structure uses its own counterweight to reduce the influence caused by the rotational torque, but the energy density of a single flywheel energy storage structure is limited, and the torque generated during the operation of multiple flywheel combinations will affect the overall stability. And the current flywheel expansion combination method uses a 90° right-angle connection. This method has stress concentration, and the layout needs to bypass more side lines to complete the torque vector synthesis, and the energy loss rate is increased to more than 15%. When the rotational speed of a single flywheel unit is out of adjustment, it cannot be quickly and effectively isolated and eliminated, affecting the overall operation stability.

[0005] It should be noted that the above content belongs to the technical cognition scope of the inventor and does not necessarily constitute the prior art. Summary of the Invention

[0006] Aiming at the deficiencies of the prior art, the present invention provides a modular flywheel energy storage structure, which solves the problems that the torque generated during the combined operation of multiple flywheel energy storage structures is difficult to offset, and the connection method has energy loss and stress concentration.

[0007] To achieve the above object, the present invention provides the following technical solution: a modular flywheel energy storage structure, including a lateral seal housing, a positioning cover sleeve, an integrated beam tube, and a resonance blocking ring. The positioning cover sleeve is arranged at the side end of the lateral seal housing, the integrated beam tube is arranged inside the lateral seal housing, and the resonance blocking ring is arranged at the upper end of the positioning cover sleeve.

[0008] A bionic honeycomb expansion frame is arranged on the periphery of the lateral seal housing, a vacuum cover is arranged inside the bionic honeycomb expansion frame, and a flywheel energy storage mechanism is arranged inside the vacuum cover.

[0009] The bionic honeycomb expansion frame further includes a limit inner ring, a fitting groove, a coolant pipe connection port, and an electromagnetic-hydraulic dual-mode coupler. There are two groups of limit inner rings, which are fixedly connected to the inner end faces near the upper and lower ends of the bionic honeycomb expansion frame.

[0010] In some embodiments, the bionic honeycomb expansion frame has a honeycomb-shaped hexagonal structure, and dense rectangular strip-shaped groove structures are arranged at both the upper and lower outer ends, and chamfering is done at adjacent hexagonal positions.

[0011] In some embodiments, six groups of fitting grooves are opened, and are respectively opened at the side ends of each side of the bionic honeycomb expansion frame. The coolant pipe connection port is opened above the fitting groove, and the electromagnetic-hydraulic dual-mode coupler is inserted into the fitting groove.

[0012] In some embodiments, the electromagnetic-hydraulic dual-mode coupler is only installed on the periphery of the bionic honeycomb expansion frame that needs to be expanded and connected, and bolt positioning holes are opened at the four corners of its side end.

[0013] In some embodiments, the flywheel energy storage mechanism further includes a hollow shaft, a charging and generating integrated motor, a radial electromagnetic bearing, a superconducting magnetic levitation bearing, a wheel shaft connecting piece, and a carbon fiber flywheel. The two ends of the hollow shaft are respectively inserted into the middle parts of the radial electromagnetic bearing and the superconducting magnetic levitation bearing.

[0014] In some embodiments, the charging and generating integrated motor is fixedly installed at the upper end of the lateral seal housing at the bottom, and the radial electromagnetic bearing and the superconducting magnetic levitation bearing are respectively fixedly installed on the inner sides of the lateral seal housings at both ends.

[0015] In some embodiments, the wheel shaft connecting piece is fixedly connected to the periphery of the flywheel energy storage mechanism, and the carbon fiber flywheel is fixedly installed on the outside of the wheel shaft connecting piece.

[0016] In some embodiments, when the bionic honeycomb expansion frame is externally expanded and connected, with the central unit as the origin, it expands outward to form an n-layer concentric honeycomb ring structure. Each layer contains 6n units, and the total number of units N = 1 + 3n(n + 1). The number of connection points Q = 6n2 + 6n, and its specific value is customized according to the power supply needs.

[0017] Compared with the prior art, the present invention provides a modular flywheel energy storage structure:

[0018] A modular flywheel energy storage structure, by setting a flywheel energy storage mechanism, a bionic honeycomb expansion frame, a limiting inner ring, a fitting groove and an electromagnetic-hydraulic dual-mode coupler. When the structure is in use, the lines inside the integrated beam tube are connected to an external control unit and a power supply unit. When the flywheel energy storage mechanism operates, the integrated motor drives the hollow shaft to rotate. The hollow shaft is supported by a superconducting magnetic bearing and a radial electromagnetic bearing, driving the wheel shaft connector and the carbon fiber flywheel. When the carbon fiber flywheel rotates at a high speed, energy storage is completed, and the integrated motor changes the transmission direction between kinetic energy and electric energy. When the hollow shaft drives the carbon fiber flywheel to rotate at a high speed, a directional torque is generated, and the bionic honeycomb expansion frame connects different flywheel energy storage units through the electromagnetic-hydraulic dual-mode coupler, and the central hollow shafts of the flywheel energy storage units connected at different positions form a 60° angle. When the rotation speed of one group of flywheel energy storage units is abnormal, the electromagnetic-hydraulic dual-mode coupler cuts off the magnetic coupling and switches it to the free rotation mode;

[0019] Through the above settings and processes, the structure has the following beneficial effects:

[0020] 1. Through the mutual combination of the bionic honeycomb expansion frames, when the adjacent flywheels form a 60° angle, the angular momentum vectors of each flywheel are non-collinear in three-dimensional space. When the system is subjected to external disturbances, the gyroscopic torque vectors generated by each flywheel can be decomposed in space to form partial reverse components, effectively reducing the resultant torque and improving the overall stability, and also improving the stability during the operation of the multi-flywheel energy storage unit array;

[0021] 2. Through the setting of the fitting groove and the electromagnetic-hydraulic dual-mode coupler at the side end of the bionic honeycomb expansion frame, a breakthrough is achieved through the spatial coordination of the 60° phase difference and the side-end coupler. The 90° right-angle phase difference layout of the traditional vertex coupling has a circuitous resultant torque vector synthesis path (modulus length |ΣL| ∝ 1 / √N), and at least 8 flywheels are required to achieve |ΣL| < 1 N·m. The 60° phase difference of the side-end coupling enables the resultant torque vector to be directly synthesized on the adjacent three sides (|ΣL| ∝ e^(-N)), and only 6 flywheels are required to suppress the residual torque below 0.02 N·m. The setting of the coupler in the honeycomb integrated system can quickly screen out the flywheel energy storage units with unmatched rotation speeds, accurately locate the faulty units and prevent the occurrence of chain faults. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 It is a schematic diagram of the top view of the present invention;

[0024] Figure 3 Schematic diagram of the installation position of the electromagnetic - hydraulic dual - mode coupler and the fitting groove of the present invention;

[0025] Figure 4 Schematic diagram of the installation position of the vacuum cover of the present invention;

[0026] Figure 5 Schematic diagram of the overall structure of the flywheel energy storage mechanism of the present invention;

[0027] Figure 6 Schematic diagram of the cross - sectional structure of the bionic honeycomb expansion frame of the present invention;

[0028] Figure 7 Schematic diagram of the coupling example of six groups of bionic honeycomb expansion frames.

[0029] In the figure: 1. Lateral sealing shell; 2. Positioning covering sleeve; 3. Integrated beam tube; 4. Resonant isolation ring; 5. Bionic honeycomb expansion frame; 501. Limiting inner ring; 502. Fitting groove; 503. Coolant pipe connection port; 504. Electromagnetic - hydraulic dual - mode coupler; 6. Vacuum cover; 7. Flywheel energy storage mechanism; 701. Hollow shaft; 702. Charging and discharging integrated motor; 703. Radial electromagnetic bearing; 704. Superconducting magnetic levitation bearing; 705. Wheel shaft connecting piece; 706. Carbon fiber flywheel. Detailed implementation manners

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly defined and limited, terms such as "installation", "provided with", "connection", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0032] In this implementation manner: A modular flywheel energy storage structure includes a lateral sealing shell 1, a positioning covering sleeve 2, an integrated beam tube 3, and a resonant isolation ring 4. The positioning covering sleeve 2 is arranged at the side end of the lateral sealing shell 1, the integrated beam tube 3 is arranged inside the lateral sealing shell 1, and the resonant isolation ring 4 is arranged at the upper end of the positioning covering sleeve 2.

[0033] A bionic honeycomb expansion frame 5 is arranged around the lateral sealing shell 1, a vacuum hood 6 is arranged inside the bionic honeycomb expansion frame 5, and a flywheel energy storage mechanism 7 is arranged inside the vacuum hood 6.

[0034] The bionic honeycomb expansion frame 5 further includes a limiting inner ring 501, a fitting groove 502, a coolant pipe connection port 503, and an electromagnetic-hydraulic dual-mode coupler 504. There are two groups of limiting inner rings 501, which are fixedly connected to the inner end faces near the upper and lower ends of the bionic honeycomb expansion frame 5.

[0035] In this embodiment, the bionic honeycomb expansion frame 5 has a honeycomb-shaped hexagonal structure, and dense rectangular strip grooves are arranged at both the upper and lower ends on the outside. Chamfering is done at adjacent hexagonal positions; six groups of fitting grooves 502 are provided, and they are respectively opened at the side ends of each side of the bionic honeycomb expansion frame 5. The coolant pipe connection port 503 is opened above the fitting groove 502, and the electromagnetic-hydraulic dual-mode coupler 504 is inserted into the fitting groove 502.

[0036] Specifically, as Figure 1 and Figure 3 shown, the strip groove structures at the upper and lower ends of the bionic honeycomb expansion frame 5 can increase the contact area between the shell and air, improving the heat dissipation efficiency. The shell of the bionic honeycomb expansion frame 5 is composed of gradient composite plug-in parts, with a high-modulus silicon carbide (elastic modulus 420 GPa) on the surface layer and a flexible titanium alloy (yield strength 900 MPa) in the core part, and the plug-in angle is 60°.

[0037] In this embodiment, the electromagnetic-hydraulic dual-mode coupler 504 is only installed on the periphery of the bionic honeycomb expansion frame 5 that needs to be expanded and connected, and bolt body positioning holes are opened at the four corners of its side end; the flywheel energy storage mechanism 7 further includes a hollow shaft 701, a charging and generating integrated motor 702, a radial electromagnetic bearing 703, a superconducting magnetic levitation bearing 704, a wheel shaft connecting piece 705, and a carbon fiber flywheel 706. Both ends of the hollow shaft 701 are respectively inserted into the middle parts of the radial electromagnetic bearing 703 and the superconducting magnetic levitation bearing 704.

[0038] Specifically, as Figure 4 and Figure 5 shown, the carbon fiber flywheel 706 is a carbon fiber reinforced composite flywheel (tensile strength ≥ 8.2 GPa), with an outer diameter of 0.8 m for a single body and an axial thickness of 0.15 m, and a permanent magnet array (residual magnetism 1.4 T) is built-in.

[0039] In this embodiment, the integrated charging and power generation motor 702 is fixedly installed at the upper end of the lateral sealing housing 1 at the bottom, and the radial electromagnetic bearing 703 and the superconducting magnetic levitation bearing 704 are respectively fixedly installed inside the two ends of the lateral sealing housing 1; the wheel shaft connecting member 705 is fixedly connected to the periphery of the flywheel energy storage mechanism 7, and the carbon fiber flywheel 706 is fixedly installed outside the wheel shaft connecting member 705; when the bionic honeycomb expansion frame 5 is externally expanded and connected, it forms an n-layer concentric honeycomb ring structure with the central unit as the origin. Each layer contains 6n units, and the total number of units N = 1 + 3n(n + 1). The number of connection points Q = 6n2 + 6n, and its specific value is customized according to the energy supply requirements.

[0040] Specifically, as Figure 2 Figure 6 and Figure 7 shown, the superconducting magnetic levitation bearing 704 is integrated with the cryostat through YBCO superconducting bulk materials to achieve zero-contact suspension, while the wheel shaft connecting member 705 is interference-fitted with the flywheel through a hot-fitting process (interference amount 0.02 - 0.05 mm).

[0041] The working principle and usage process of the present invention: When this structure is in use, a connection is established with an external control unit and a power supply unit through the circuit inside the integrated beam tube 3. When the flywheel energy storage mechanism 7 operates, the integrated charging and power generation motor 702 drives the hollow shaft 701 to rotate. The hollow shaft 701 drives the wheel shaft connecting member 705 and the carbon fiber flywheel 706 through the support of the superconducting magnetic levitation bearing 704 and the radial electromagnetic bearing 703. When the carbon fiber flywheel 706 rotates at a high speed, energy storage is completed, and the integrated charging and power generation motor 702 changes the transfer direction between kinetic energy and electrical energy. When the hollow shaft 701 drives the carbon fiber flywheel 706 to rotate at a high speed, a directional torque is generated, and the bionic honeycomb expansion frame 5 is connected to different flywheel energy storage units through an electromagnetic-hydraulic dual-mode coupler 504. The central hollow shafts 701 of the flywheel energy storage units connected at different positions form a 60° angle. When the rotational speed of one group of flywheel energy storage units is abnormal, the electromagnetic-hydraulic dual-mode coupler 504 cuts off the magnetic coupling and switches it to the free rotation mode.

[0042] Each embodiment in this specification is described in a progressive manner. The same or similar parts among the embodiments can be referred to each other, and the key points of each embodiment are the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, it is described relatively simply, and the relevant parts can be referred to the partial description of the method embodiment.

[0043] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A modular flywheel energy storage structure, characterized in that: The invention comprises a lateral sealing shell (1), a positioning covering sleeve (2), an integrated wire bundle tube (3) and a resonance barrier ring (4), wherein the positioning covering sleeve (2) is arranged at the side end of the lateral sealing shell (1), the integrated wire bundle tube (3) is arranged inside the lateral sealing shell (1), and the resonance barrier ring (4) is arranged at the upper end of the positioning covering sleeve (2), and is characterized in that: A bionic honeycomb expansion frame (5) is arranged on the periphery of the lateral sealing shell (1), a vacuum cover (6) is arranged on the inner side of the bionic honeycomb expansion frame (5), and a flywheel energy storage mechanism (7) is arranged on the inner side of the vacuum cover (6); The bionic honeycomb expansion frame (5) further comprises a limiting inner ring (501), an engaging groove (502), a coolant pipe connection port (503) and an electromagnetic-hydraulic dual-mode coupler (504); the limiting inner ring (501) is provided in two groups and is fixedly connected to the inner end faces near the upper and lower ends of the bionic honeycomb expansion frame (5).

2. A modular flywheel energy storage structure according to claim 1, characterized in that: The bionic honeycomb expansion frame (5) is a honeycomb hexagonal structure, and both upper and lower ends of the outer side are provided with densely arranged rectangular strip groove structures, and chamfering is performed at adjacent positions of the hexagons.

3. A modular flywheel energy storage structure according to claim 1, characterized in that: The interlocking grooves (502) are provided in six groups and are respectively provided at the side ends of each side of the bionic honeycomb expansion frame (5); the coolant pipe connection port (503) is provided above the interlocking grooves (502); and the electromagnetic-hydraulic dual-mode coupler (504) is plugged into the inside of the interlocking grooves (502).

4. A modular flywheel energy storage structure according to claim 1, characterized in that: The electromagnetic-hydraulic dual-mode coupler (504) is only installed on the periphery of the bionic honeycomb expansion frame (5) that needs to be expanded and connected, and bolt positioning holes are provided at the four corners of its side ends.

5. A modular flywheel energy storage structure according to claim 1, characterized in that: The flywheel energy storage mechanism (7) further comprises a hollow shaft (701), a charging and generating integrated motor (702), a radial electromagnetic bearing (703), a superconducting magnetic suspension bearing (704), a wheel-axle connecting piece (705) and a carbon fiber flywheel (706), wherein two ends of the hollow shaft (701) are respectively inserted into the middle of the radial electromagnetic bearing (703) and the superconducting magnetic suspension bearing (704).

6. A modular flywheel energy storage structure according to claim 5, characterized in that: The charging and generating integrated motor (702) is fixedly mounted on the upper end of the lateral sealing shell (1) at the bottom, and the radial electromagnetic bearing (703) and the superconducting magnetic suspension bearing (704) are respectively fixedly mounted on the inner sides of the lateral sealing shells (1) at both ends.

7. A modular flywheel energy storage structure according to claim 5, characterized in that: The wheel-axle connecting member (705) is fixedly connected to the periphery of the flywheel energy storage mechanism (7), and the carbon fiber flywheel (706) is fixedly installed on the outside of the wheel-axle connecting member (705).

8. A modular flywheel energy storage structure according to claim 1, characterized in that: When the bionic honeycomb expansion frame (5) is externally expanded and connected, the central unit is used as the origin and expands outward to form n layers of concentric honeycomb ring structures. Each layer contains 6n units, and the total number of units N=1+3n(n+1). The number of connection points Q=6n2+6n, and its specific value is customized according to energy supply needs.

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