A flywheel energy storage device

Abstract

This application discloses a flywheel energy storage device, relating to the field of energy storage equipment technology. It includes a housing and at least one stator. The housing comprises an upper cover, a lower cover, and multiple cylindrical bodies disposed between the two. The multiple cylindrical bodies are segmented along the axial direction. Adjacent cylindrical bodies are vertically sealed and clamped to the corresponding stator. The outer side of the stator is in contact with the atmosphere, and the inner side of the stator extends into the housing. The stator includes an upper plate, a lower plate, and a coil body disposed between the two. The upper and lower plates are vertically sealed and fixed, clamping the coil body. The inlet and outlet ends of the coil body pass through the space between the upper and lower plates and exit the stator to the atmosphere. This solution, through the segmented housing and stator design, solves the problem of poor vacuum sealing in existing technologies.

Description

Technical Field

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

[0002] Existing flywheel energy storage systems mostly employ integrated vacuum containers, requiring through-holes for electrical connections and sensor placement, resulting in an exceptionally complex vacuum sealing structure. Each through-hole requires independent sealing, creating multiple potential leakage paths, significantly increasing the risk of seal failure and maintenance difficulty. The vacuum level decays rapidly, necessitating continuous operation of high-power vacuum pumps to maintain the negative pressure environment, leading to energy waste and escalating maintenance costs. Furthermore, the multi-layered rotor and stator axial stacking layout severely limits assembly space, hinders tool operability, results in high manual assembly error rates, and makes automated production difficult, severely restricting capacity expansion. Summary of the Invention

[0003] In order to overcome the shortcomings of the prior art, this application provides a flywheel energy storage device, which solves the problem of poor vacuum sealing in the prior art by using a segmented shell and stator design.

[0004] To achieve the above objectives, this application adopts the following technical solution: A flywheel energy storage device includes a housing and at least one stator. The housing includes an upper cover, a lower cover, and a plurality of cylindrical bodies disposed between the two. The plurality of cylindrical bodies are arranged in segments along the axial direction. Adjacent cylindrical bodies are sealed and clamped to the corresponding stator from top to bottom. The outer side of the stator is in contact with the atmosphere, and the inner side of the stator extends into the housing. The stator includes an upper plate, a lower plate, and a coil body disposed between the two. The upper plate and the lower plate are sealed and fixed to clamp the coil body from top to bottom. The inlet and outlet ends of the coil body pass through the stator to the atmosphere from between the upper plate and the lower plate.

[0005] In the above technical solution, by exposing the stator to the atmosphere on the outside, the coil body can directly pass through the stator to the outer casing without the need for additional through holes in the casing, thus avoiding the problem of reduced sealing performance caused by through holes in the casing. Furthermore, the portion of the coil body located inside the casing is encased within the upper and lower plates, preventing direct contact with the internal space of the casing, effectively isolating the coil body from the interior of the casing, further improving the overall sealing performance and operational reliability of the device. By sealing and clamping the corresponding stators between two adjacent cylinders, the path of external gas entering the vacuum cavity along the interlayer gaps can be effectively blocked, improving sealing reliability.

[0006] Preferably, the upper plate and the lower plate are both integral structures.

[0007] In the above technical solution, the upper plate and the lower plate adopt an integrated structural design, which can effectively avoid the reduction of air tightness and the weakening of structural strength caused by splicing gaps, thereby ensuring that the stator works stably for a long time in a high vacuum environment.

[0008] Preferably, a coil plate sealing ring is provided between the upper plate and the lower plate, and the upper plate and the lower plate clamp the coil plate sealing ring together, with the coil plate sealing ring located inside the coil body.

[0009] In the above technical solution, a double-sealed protection for the internal structure of the stator is achieved by clamping the coil plate sealing ring inside the coil body between the upper and lower plates, effectively isolating the vacuum cavity from leakage channels to the outside world. Because the coil plate sealing ring is located inside the coil body, even if there are minor defects in the seal between the upper and lower plates, or potential leakage risks at the inlet and outlet ends, the inner sealing ring can still effectively cut off the gas passage, ensuring the long-term stability of the vacuum environment. This sealing structure adopts an upper and lower clamping design, ensuring balanced force on the sealing ring and significantly enhancing the durability and reliability of the seal.

[0010] Preferably, the upper plate and the lower plate are sealed and fixed by filling with sealant; and / or, the upper plate and the lower plate are fastened and sealed by fasteners, the fasteners passing through the upper plate and the lower plate and cooperating with the sealing ring to achieve pre-tightening sealing.

[0011] In the above technical solution, sealing with sealant can effectively eliminate the microscopic gaps between the contact surfaces of the upper and lower plates, block gas permeation paths, and improve the airtightness of the sealing interface. Furthermore, this operation can be performed simultaneously with the coil body during factory processing, improving production efficiency and consistency. Using fasteners in conjunction with the sealing ring to achieve pre-tightening sealing ensures structural strength while allowing the sealing ring to be uniformly compressed, forming a stable and reliable sealing interface. The sealant and fasteners can be used individually or in combination to adapt to different vacuum levels and operating conditions.

[0012] Preferably, the upper plate and / or lower plate are provided with receiving grooves for accommodating the coil body.

[0013] In the above technical solution, by setting receiving grooves on the upper plate and / or lower plate, the coil body can be accurately positioned and firmly embedded inside the stator, effectively avoiding coil displacement caused by vibration, while improving the compactness and mechanical stability of the overall structure.

[0014] Preferably, a second sealing ring is provided between the cylinder and the stator.

[0015] In the above technical solution, a second sealing ring is set between the contact surfaces of the cylinder and the stator, which can effectively block the gas leakage path in the assembly gap between the two and further improve the overall sealing performance of the vacuum chamber.

[0016] Preferably, the upper cover is separately disposed from the uppermost cylindrical body and is sealed and connected by a sealing structure, and the lower cover is separately disposed from the lowermost cylindrical body and is sealed and connected by a sealing structure.

[0017] In the above technical solution, the upper cover and the uppermost cylinder, and the lower cover and the lowermost cylinder are connected by a sealing structure to achieve a detachable sealed connection, which facilitates the individual processing of each part, helps to reduce the processing cost of parts and improve the flexibility of overall assembly.

[0018] Preferably, the upper cover is integrally formed with the uppermost cylinder, and the lower cover is integrally formed with the lowermost cylinder.

[0019] In the above technical solution, the upper cover is integrally formed with the uppermost cylinder, and the lower cover is integrally formed with the lowermost cylinder, which can reduce the sealing seams in the assembly process and improve the overall structural strength and vacuum sealing reliability.

[0020] Preferably, a first magnetic ring is provided on the outer side of the inlet end of the coil body, and the wire outside the inlet end is wound around the first magnetic ring. A second magnetic ring is provided on the outer side of the outlet end, and the wire outside the outlet end is wound around the second magnetic ring. In this application, a single coil generally uses Litz wire twisted from multiple strands of fine wire. Due to voltage differences between the strands, circulating currents are generated inside the single coil, heating the coil and leading to the undesirable consequence of increased motor temperature. Therefore, in order to reduce circulating currents, the wires at the inlet and outlet ends of the coil body can be directly wound around the magnetic rings (without cutting the coil), forming inductance and increasing the coil's impedance. Attached Figure Description

[0021] Figure 1 This is a structural sectional view of this application; Figure 2 yes Figure 1 A magnified view of a section at point A in the middle; Figure 3 This is a three-dimensional structural diagram of this application; Figure 4 This is a schematic diagram of the stator structure in this application. Figure 1 ; Figure 5 This is a schematic diagram of the stator structure in this application. Figure 2 .

[0022] In the diagram: outer shell 1, upper cover 11, lower cover 12, upper bearing seat 101, lower bearing seat 102, cylinder 13, rotating shaft 2, rotor 3, accommodating gap 4, stator 5, upper plate 51, lower plate 52, inlet end 531, outlet end 532, accommodating groove 54, coil plate sealing ring 55, first magnetic ring 56, second magnetic ring 57, heat dissipation fins 6, sealing cover 7, bracket 8, second sealing ring 9. Detailed Implementation

[0023] The present application will now be further described with reference to the accompanying drawings and specific embodiments.

[0024] Example 1: like Figures 1 to 5 As shown, a flywheel energy storage device includes a housing 1 and multiple stators 5. The housing 1 includes an upper cover 11, a lower cover 12, and multiple cylindrical bodies 13 disposed between the two. The multiple cylindrical bodies 13 are segmented along the axial direction. Adjacent cylindrical bodies 13 are sealed and clamped between their respective stators 5. The outer side of the stator 5 is in contact with the atmosphere, and the inner side of the stator 5 extends into the housing 1. The stator 5 includes an upper plate 51, a lower plate 52, and a coil body disposed between the two. The upper plate 51 and the lower plate 52 are sealed and fixed together to clamp the coil body. The inlet end 531 and the outlet end 532 of the coil body pass through the space between the upper plate 51 and the lower plate 52 and exit the stator 5 to the atmosphere. The stator has a flat annular structure.

[0025] In the above technical solution, by exposing the stator 5 to the atmosphere, the coil body can directly pass through the stator 5 to the outer casing 1 without the need for additional through holes on the outer casing 1, thus avoiding the problem of reduced sealing performance caused by through holes on the outer casing 1. Furthermore, the portion of the coil body located inside the outer casing 1 is enclosed within the upper plate 51 and lower plate 52, preventing direct contact with the internal space of the outer casing 1, thus forming an effective isolation between the coil body and the interior of the outer casing 1, further improving the overall sealing performance and operational reliability of the device. By sealing and clamping the corresponding stator 5 between the two adjacent cylinders 13, the path of external gas entering the vacuum cavity along the interlayer gaps can be effectively blocked, improving sealing reliability.

[0026] Preferably, a first magnetic ring 56 is provided on the outer side of the coil body's inlet end 531, and the wire outside the inlet end 531 is wound around the first magnetic ring 56. A second magnetic ring 57 is provided on the outer side of the coil body's outlet end 532, and the wire outside the outlet end 532 is wound around the second magnetic ring 57. In this application, a single coil generally uses Litz wire twisted from multiple strands of fine wire. Due to voltage differences between the strands, circulating currents are generated inside the single coil, heating the coil and leading to the undesirable consequence of increased motor temperature. Therefore, in order to reduce circulating currents, the wires at the inlet end 531 and outlet end 532 of the coil body can be directly wound around the magnetic rings (without cutting the coil), forming an inductance and increasing the coil's impedance.

[0027] Preferably, the upper plate 51 and the lower plate 52 are both integral structures. A coil plate sealing ring 55 is provided between the upper plate 51 and the lower plate 52, and the upper plate 51 and the lower plate 52 clamp the coil plate sealing ring 55 tightly. The coil plate sealing ring 55 is located inside the coil body. The upper plate 51 and / or the lower plate 52 are provided with receiving grooves 54 for accommodating the coil body.

[0028] In the above technical solution, the upper plate 51 and the lower plate 52 adopt an integrated structural design, which can effectively avoid the reduction of airtightness and structural strength caused by splicing gaps, thereby ensuring the long-term stable operation of the stator 5 in a high vacuum environment. By clamping the coil plate sealing ring 55 inside the coil body between the upper plate 51 and the lower plate 52, double sealing protection of the internal structure of the stator 5 is achieved, effectively isolating the vacuum cavity from the leakage channel of the outside world. The coil plate sealing ring 55 being located inside the coil body means that the coil plate sealing ring 55 is arranged in the radially inner area of ​​the coil body and does not directly contact the coil body. The coil plate sealing ring 55 can be an O-ring, which has a certain elasticity and can be placed in the sealing groove to prevent air from entering between the upper and lower planes. The sealing groove can be provided only in the upper plate 51, only in the lower plate 52, or both the upper plate 51 and the lower plate 52. Because the coil plate sealing ring 55 is located inside the coil body, even if there are minor defects in the seal between the upper plate 51 and the lower plate 52, or potential leakage risks at the inlet end 531 and the outlet end 532, the inner sealing ring can still effectively cut off the gas passage and ensure the long-term stability of the vacuum environment. This sealing structure adopts an upper and lower compression design, which ensures that the sealing ring is subjected to balanced force, significantly enhancing the durability and reliability of the seal. By providing receiving grooves 54 in the upper plate 51 and / or the lower plate 52, the coil body can be precisely positioned and firmly embedded inside the stator 5, effectively preventing coil displacement caused by vibration, while also improving the overall structural compactness and mechanical stability.

[0029] Preferably, a second sealing ring is provided between the cylinder 13 and the stator 5. In the above technical solution, providing a second sealing ring between the contact surfaces of the cylinder 13 and the stator 5 can effectively block the gas leakage path in the assembly gap between the two, further improving the overall sealing performance of the vacuum chamber. The second sealing ring can be an O-ring, which has a certain degree of elasticity and, when placed in a sealing groove, can prevent air from entering between the upper and lower planes. The sealing groove can be provided on the side wall or lower surface of the cylinder.

[0030] Preferably, the upper plate 51 and the lower plate 52 are sealed and fixed by filling with sealant; the upper plate 51 and the lower plate 52 are fastened and sealed by fasteners, which pass through the upper plate 51 and the lower plate 52 and cooperate with the sealing ring to achieve pre-tightening sealing.

[0031] In the above technical solution, sealing with sealant can effectively eliminate the microscopic gaps between the contact surfaces of the upper plate 51 and the lower plate 52, block gas permeation paths, and improve the airtightness of the sealing interface. This operation can also be performed simultaneously with the coil body during factory processing, improving production efficiency and consistency. Furthermore, using a high-strength sealant can bond the upper plate 51, lower plate 52, and coil body together. After the sealant cures, the upper plate 51, lower plate 52, and coil body form a single ring plate, effectively improving the stiffness and strength of the stator and eliminating the catastrophic accident risk caused by stator deformation and contact with the rotor. This type of sealant must also have insulating properties to enhance the insulation performance of the coil inside the stator. Using fasteners in conjunction with the sealing ring to achieve pre-tightening sealing ensures structural strength while allowing the sealing ring to be uniformly compressed, forming a stable and reliable sealing interface. The sealant and fasteners can be used alone or in combination to adapt to different vacuum levels and operating conditions.

[0032] Understandably, in one embodiment, the upper cover 11 and the uppermost cylinder 13 are separately configured and sealed together by a sealing structure, and the lower cover 12 and the lowermost cylinder 13 are separately configured and sealed together by a sealing structure. In the above technical solution, the separate upper cover 11 and the uppermost cylinder 13, and the lower cover 12 and the lowermost cylinder 13 are detachably sealed together by a sealing structure, which facilitates the individual processing of each part, helps to reduce the processing cost of parts, and improves the flexibility of overall assembly.

[0033] Understandably, in another embodiment, the upper cover 11 is integrally formed with the uppermost cylinder 13, and the lower cover 12 is integrally formed with the lowermost cylinder 13. In the above technical solution, the upper cover 11 and the uppermost cylinder 13 are integrally formed, and the lower cover 12 and the lowermost cylinder 13 are integrally formed, which can reduce the sealing joints in the assembly process and improve the overall structural strength and vacuum sealing reliability.

[0034] Specifically, the flywheel energy storage device also includes a rotating shaft 2 and multiple rotors 3. The rotating shaft 2 is rotatably connected to the housing 1. The multiple rotors 3 are sequentially installed on the rotating shaft 2 along the axial direction of the rotating shaft 2 and are circumferentially fixed to the rotating shaft 2. A accommodating gap 4 is provided between two adjacent rotors 3. The inner side of the stator 5 extends into the corresponding accommodating gap 4. Permanent magnets are fixed on the rotors 3, and the permanent magnets are correspondingly arranged with the coil bodies on the stator 5. The upper cover 11 is provided with a connecting port 111 and a sealing cover 7 for sealing the connecting port 111. The sealing cover 7 is detachably connected to the upper cover 11.

[0035] In the above technical solution, due to the segmented layout of multiple cylinders 13 and the orderly arrangement of multiple rotors 3, the assembly of cylinders 13, stators 5, and rotors 3 can be completed step by step during installation, reducing the depth to which rotors 3 and stators 5 extend into the outer casing 1 during each assembly, thereby reducing the complexity of assembly. The segmented design facilitates installation, maintenance, and replacement, enabling assembly in an assembly line manner, improving production efficiency and reducing production costs. In addition, the alternating arrangement and coordinated operation of multiple rotors 3 and stators 5 can significantly improve the energy conversion power of the energy storage system, meeting the needs of high power density application scenarios. The connecting port 111 is used to connect detection or maintenance equipment when necessary, and a vacuum pump can be connected to remove air from the cavity when evacuating the interior. The upper and lower ends of the rotating shaft 2 are fixed to the upper cover 11 and the lower cover 12 by bearings. The upper bearing and the lower bearing are respectively installed in the upper bearing seat 101 and the lower bearing seat 102, which are respectively arranged on the upper cover 11 and the lower cover 12. The upper bearing housing 101 and the lower bearing housing 102 are sealed to the upper cover 11 and the lower cover 12, preferably with O-rings.

[0036] The installation method of the above-mentioned flywheel energy storage device includes the following steps: Step 100: hoist the lowest cylinder 13 and seal it with the lower cover 12; Step 200: install the rotating shaft 2 on the lower cover 12 and rotatably connect the rotating shaft 2 and the lower cover 12 through bearings; Step 300: sleeve the lowest rotor 3 on the rotating shaft 2; Step 400: sleeve the stator 5 on the outside of the rotating shaft 2 and make the cylinder 13 support the stator 5; Step 500: continue to sleeve the next rotor 3 on the rotating shaft 2; Step 600: sleeve the next cylinder 13 on the outside of the rotating shaft 2 and connect it with the lower cylinder 13, and clamp the upper and lower ends of the stator 5 to achieve sealing and fixation; Step 700: repeat steps 400 to 600 until all rotors 3 and cylinders 13 are assembled in sequence; Step 800: install the upper cover 11 and rotatably connect the upper end of the rotating shaft 2 to the upper cover 11 through bearings.

Claims

1. A flywheel energy storage device, characterized in that, The device includes an outer casing and at least one stator. The outer casing includes an upper cover, a lower cover, and multiple cylindrical bodies disposed between the two. The multiple cylindrical bodies are arranged in segments along the axial direction. Adjacent cylindrical bodies are sealed and clamped to the corresponding stator from top to bottom. The outer side of the stator is in contact with the atmosphere, and the inner side of the stator extends into the outer casing. The stator includes an upper plate, a lower plate, and a coil body disposed between the two. The upper plate and the lower plate are sealed and fixed to clamp the coil body from top to bottom. The inlet and outlet ends of the coil body pass through the stator to the atmosphere between the upper plate and the lower plate.

2. The flywheel energy storage device according to claim 1, characterized in that, The upper plate is a single-piece structure, and the lower plate is a single-piece structure.

3. The flywheel energy storage device according to claim 1, characterized in that, A coil plate sealing ring is provided between the upper plate and the lower plate. The upper plate and the lower plate clamp the coil plate sealing ring tightly. The coil plate sealing ring is located inside the coil body.

4. The flywheel energy storage device according to claim 1, characterized in that, The upper plate and the lower plate are sealed and fixed by filling with sealant; and / or, the upper plate and the lower plate are fastened and sealed by fasteners, the fasteners passing through the upper plate and the lower plate and cooperating with the sealing ring to achieve pre-tightening sealing.

5. A flywheel energy storage device according to claim 1, characterized in that, The upper plate and / or lower plate are provided with receiving slots for accommodating the coil body.

6. A flywheel energy storage device according to claim 1, characterized in that, A second sealing ring is provided between the cylinder and the stator.

7. A flywheel energy storage device according to claim 1, characterized in that, The upper cover is separately disposed from the uppermost cylinder and is sealed and connected by a sealing structure, and the lower cover is separately disposed from the lowermost cylinder and is sealed and connected by a sealing structure; or, the upper cover is integrally disposed from the uppermost cylinder and the lower cover is integrally disposed from the lowermost cylinder.

8. A flywheel energy storage device according to claim 1, characterized in that, The coil body has a first magnetic ring on the outside of the inlet end, and the wire outside the inlet end of the coil body is wound around the first magnetic ring. The coil body has a second magnetic ring on the outside of the outlet end, and the wire outside the outlet end is wound around the second magnetic ring.

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