Dampers for flywheel energy storage systems

Abstract

The utility model provides a damper for a flywheel energy storage system, including a shell, a damper body and a sealing element. A housing is formed inside the shell for accommodating components such as the damper body and the sealing element. The damper body is divided into a sealing portion and a connecting portion according to its function. The sealing portion is sealed with the inner wall of the housing chamber. The sealing element is used to achieve sealing of the joint surface between the sealing portion and the housing chamber, thereby ensuring the vacuum inside the protective shell of the flywheel energy storage device, so that the flywheel drill can rotate at high speed in a vacuum environment, with low rotational resistance and low energy loss. A mounting hole is provided at one end of the housing chamber, and the mounting hole is used for threaded cooperation with the connecting portion of the damper body, so that the damper body can adjust its axial position relative to the shell through threaded cooperation. With such a configuration, the damping of the damper body on the flywheel rotor is adjustable, and can be applied to more working conditions. The product has a wider range of application and is more versatile.

Description

Technical Field

[0001] The utility model belongs to the technical field of flywheel energy storage, and in particular relates to a damper used in a flywheel energy storage system. Background Art

[0002] A flywheel energy storage device is an energy storage device that uses electricity to drive a flywheel to rotate at high speed when sufficient power is available, converting the electrical energy into stored mechanical energy. When the system needs it, the flywheel slows down, and the electric motor operates as a generator, converting the flywheel's kinetic energy into electrical energy for the user. Because flywheel energy storage systems utilize the kinetic energy of rotating bodies to store and release electrical energy, they offer long charge and discharge lifespans, no capacity degradation throughout their lifecycle, no explosion risk during operation, and high charge and discharge cycle efficiency. They have already found large-scale application in uninterruptible power supplies, electric vehicle charging stations, rail transit kinetic energy recovery, and grid frequency regulation.

[0003] The flywheel rotor is the primary energy storage component of a flywheel energy storage system. Because the flywheel rotor vibrates during high-speed operation, a vibration-damping component is required at the bottom of the flywheel to prevent vibration from affecting its normal operation and extend the life of the bearings. This reduces the axial vibration transmitted by the flywheel rotor and ensures the smooth and efficient operation of the flywheel rotor system. Conventional vibration-damping components cannot be adjusted in axial position after being installed in the energy storage housing, and thus cannot adjust the damping effect on the flywheel rotor, affecting their effective vibration damping. Utility Model Content

[0004] The utility model provides a damper for a flywheel energy storage system, aiming to solve the problem in the prior art that a vibration-damping component cannot adjust its axial position.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is to provide a damper for a flywheel energy storage system, comprising:

[0006] a housing, wherein the housing is hollow and has an accommodating cavity formed therein, the accommodating cavity extending axially through the housing, a mounting hole communicating with the accommodating cavity being formed at one axial end of the housing, the inner diameter of the mounting hole being larger than the inner diameter of the accommodating cavity, and the mounting hole having an internal thread;

[0007] A damper body having a sealing portion and a connecting portion, the sealing portion and the connecting portion being connected along the axial direction of the damper body, the sealing portion slidingly engaging with the inner wall of the accommodating cavity, an annular sealing groove being formed on the outer peripheral wall of the sealing portion, and the connecting portion being threadedly engaged with the mounting hole; and

[0008] The sealing element is annular and is arranged in the sealing groove.

[0009] In a possible implementation, the damper for the flywheel energy storage system further includes an anti-loosening mechanism, which abuts against one end of the damper body adjacent to the mounting hole and is used to apply a pre-tightening force to the damper body to move into the accommodating cavity.

[0010] In a possible implementation, an annular limiting groove is formed on the inner wall of the mounting hole, and the limiting groove is located on a side of the damper body adjacent to the mounting hole. The anti-loosening mechanism includes:

[0011] a limiting member detachably disposed in the limiting groove, wherein an adjustment cavity is formed between the limiting member and the damper body;

[0012] a clamping plate disposed in the adjustment cavity and abutting against a side of the limiting member adjacent to the damper body, the clamping plate being provided with an adjustment hole that passes through the thickness direction of the clamping plate and has an internal thread; and

[0013] An adjusting screw is threadably engaged with the adjusting hole, and an end portion of the adjusting screw abuts against the damper body.

[0014] In a possible implementation, the limiting member is a clip.

[0015] In a possible implementation, the card plate is provided with a plurality of the adjustment holes, the plurality of the adjustment holes are arranged at intervals along the length direction of the card plate, and a plurality of the adjustment screws are provided in a one-to-one correspondence with the adjustment holes.

[0016] In a possible implementation, a positioning boss is formed on the housing. The positioning boss is annular and protrudes from the outer peripheral wall of the housing.

[0017] In a possible implementation, the sealing portion is provided with a plurality of sealing grooves along its axial direction, and the sealing elements correspond to the sealing grooves one by one.

[0018] In a possible implementation, the damper body is a squeeze film damper.

[0019] In a possible implementation, a shaft socket adapted to the spiral groove dynamic pressure bearing is formed on the top of the squeeze film damper.

[0020] In a possible implementation, the sealing element is an O-ring.

[0021] Compared with the prior art, the beneficial effects of the damper for the flywheel energy storage system provided by the utility model are:

[0022] The damper for a flywheel energy storage system provided by the present invention includes a housing, a damper body and a sealing element. A housing is formed inside the housing for accommodating components such as the damper body and the sealing element, and providing installation and support positions for other components. The damper body can be divided into a sealing portion and a connecting portion according to its function. The sealing portion is sealed with the inner wall of the housing chamber. The sealing element is used to achieve sealing of the joint surface between the sealing portion and the housing chamber, ensuring that the protective shell of the flywheel energy storage device is hollow inside, so that the flywheel drill can rotate at high speed in a vacuum environment, with low rotational resistance and low energy loss. A mounting hole is provided at one end of the housing chamber, and the mounting hole is used to threadably engage with the connecting portion of the damper body, so that the damper body can adjust its axial position relative to the housing through threaded engagement. With such an arrangement, the damping of the damper body on the flywheel rotor is adjustable, and it can be applied to more working conditions. The product has a wider range of applications and is more versatile. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic cross-sectional view of a damper for a flywheel energy storage system provided in one embodiment of the present utility model;

[0024] Figure 2 for Figure 1 A partial enlarged view of the part marked A;

[0025] Figure 3 An exploded view of a damper assembly for a flywheel energy storage system provided in one embodiment of the present utility model;

[0026] Figure 4 This is a schematic diagram of the installation of a damper for a flywheel energy storage system provided in one embodiment of the present utility model.

[0027] Description of reference numerals:

[0028] 1. Dampers used in flywheel energy storage systems;

[0029] 10. Housing; 11. Accommodating cavity; 12. Mounting hole; 121. Limiting groove; 13. Positioning boss;

[0030] 20. Damper body; 21. Sealing portion; 211. Sealing groove; 212. Shaft socket; 22. Connecting portion;

[0031] 30. Sealing element;

[0032] 40. Anti-loosening mechanism; 41. Limiting member; 42. Clamping plate; 421. Adjusting hole; 43. Adjusting screw;

[0033] 2. Flywheel energy storage device;

[0034] 50. Flywheel rotor; 60. Spiral groove hydrodynamic bearing; 70. Magnetic bearing; 80. Protective housing; DETAILED DESCRIPTION

[0035] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0036] It should be noted that when an element is referred to as being "fixed to," "fixed," or "fixedly disposed" on another element, it may be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected to," "connected to" another element, it may be directly connected to the other element or there may also be an intermediate element. When an element is referred to as being "set on," "disposed on" another element, it may be directly on the other element or there may also be an intermediate element. "Multiple" refers to two or more. "At least one" refers to one or more. "Several" refers to one or more.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

[0038] Please also refer to Figures 1 to 4 The structure and working principle of the damper 1 for the flywheel energy storage system provided in the embodiment of the present invention are described below.

[0039] See also Figures 1 to 4 The embodiment of the utility model provides a damper 1 for a flywheel energy storage system, specifically including a shell 10, a damper body 20 and a sealing element 30. The shell 10 is a cylindrical component. The interior of the shell 10 is hollow to form an accommodating chamber 11. The accommodating chamber 11 passes through the axial direction of the shell 10. One axial end of the shell 10 is provided with a mounting hole 12 connected to the accommodating chamber 11. The inner diameter of the mounting hole 12 is larger than the inner diameter of the accommodating chamber 11, and the mounting hole 12 has an internal thread; the damper body 20 specifically includes a sealing portion 21 and a connecting portion 22. The sealing portion 21 and the connecting portion 22 are connected along the axial direction of the damper body 20. The sealing portion 21 is slidably matched with the inner wall of the accommodating chamber 11. The outer peripheral wall of the sealing portion 21 is provided with an annular sealing groove 211, and the connecting portion 22 is threadedly matched with the mounting hole 12; the sealing element 30 is annular and is arranged in the sealing groove 211.

[0040] Compared with the prior art, the damper 1 for the flywheel energy storage system provided by the present invention has the following beneficial effects:

[0041] The damper 1 for a flywheel energy storage system provided by the present invention includes a housing 10, a damper body 20 and a sealing element 30. A housing 10 is formed with a housing 11 for accommodating components such as the damper body 20 and the sealing element 30, and providing a mounting and support position for other components. The damper body 20 can be divided into a sealing portion 21 and a connecting portion 22 according to its function. The sealing portion 21 is sealed with the inner wall of the housing 11. The sealing element 30 is used to achieve a seal at the joint surface between the sealing portion 21 and the housing 11, ensuring that the protective shell 80 of the flywheel energy storage device 2 is hollow, so that the flywheel drill can rotate at high speed in a vacuum environment, with low rotational resistance and low energy loss. A mounting hole 12 is provided at one end of the housing 11. The mounting hole 12 is used to threadably engage with the connecting portion 22 of the damper body 20, so that the damper body 20 can adjust its axial position relative to the housing 10 through threaded engagement. With such a configuration, the damping of the damper body 20 on the flywheel rotor 50 is adjustable, and can be applied to more working conditions. The product has a wider range of applications and is more versatile.

[0042] The damper provided in the embodiment of the present invention is suitable for a flywheel energy storage device 2 or an energy storage system. Figure 4 As shown, in a specific embodiment, the housing 10 is mounted on the bottom of a protective housing 80, a magnetic bearing 70 is disposed on the top of the protective housing 80, a spiral groove hydrodynamic bearing 60 is connected to the top of the damper body 20, and the spiral groove hydrodynamic bearing 60 is connected to the flywheel rotor 50. The flywheel rotor 50 is disposed between the spiral groove hydrodynamic bearing 60 and the magnetic bearing 70, and the stator can be mounted on the side wall of the protective housing 80. In addition to the above embodiment, the damper can also be disposed on the top of the flywheel energy storage device 2, and the user can configure it according to their own needs. The structure of the flywheel energy storage device 2 is conventional and will not be described in detail here.

[0043] like Figure 4 As shown, when the damper is set at the bottom of the flywheel energy storage device 2, in addition to being able to adjust the damping size, it can also drive the flywheel rotor 50 to move up and down. In this way, during transportation, in order to avoid vibration and tilting that cause the flywheel rotor 50 to collide or tilt, the flywheel rotor 50 can be moved downward to abut against the bottom receiving surface of the protective shell 80 by adjusting the damper body 20, and then a tightening mechanism that can apply a clamping force to the flywheel rotor 50 is set above the protective shell 80. With this arrangement, the flywheel rotor 50 can be fixed in the protective shell 80 before transportation. After being transported to the designated location, the tightening mechanism can be removed, and the damper body 20 can be adjusted to drive the flywheel rotor 50 to return to its original position. The embodiment of the utility model provides a damper body 20 with an adjustable axial height, which can drive the flywheel rotor 50 to move vertically, thereby facilitating the transportation of the flywheel rotor 50.

[0044] In the embodiment of the present invention, the housing 10 can be made of metal or other materials, and a receiving cavity 11 is formed inside the housing 10 for accommodating the damper body 20. It should be understood and realized by those skilled in the art that the damper body 20 in the embodiment of the present invention can directly adopt a damper structure in the prior art, such as a squeeze film damper, or can be obtained by slightly modifying a damper product in the prior art (such as machining a thread that matches the housing 10 on the shell of an existing damper product) so that it matches the housing 10. In addition, components such as damping springs, rubber buffer blocks, and damping oil cylinders that can perform a buffering and shock-absorbing function can be provided inside the damper body 20.

[0045] In the present invention, the damper body 20 and the housing 10 are connected by threads, which can adjust their axial position, thereby achieving adjustment of damping and stiffness. However, in a vibrating environment for a long time, the threads are prone to loosening. In order to prevent the damper body 20 and the housing 10 from loosening after long-term use, please refer to Figure 1 and Figure 2 In some possible embodiments, the housing 10 of the damper 1 for the flywheel energy storage system provided in this embodiment has an end on which a mounting hole 12 is opened and an anti-loosening mechanism 40 is also provided. The anti-loosening mechanism 40 abuts against an end of the damper body 20 adjacent to the mounting hole 12 and is used to apply a pre-tightening force to the damper body 20 to move into the accommodating cavity 11.

[0046] The anti-loosening mechanism 40 can be a tightening screw, wedge, or the like that applies a tightening force to the lower portion of the damper body 20. The damper body 20 can be rotated manually or with a tool such as a torque wrench. To facilitate rotation, the damper body 20 can be provided with a handle or a hexagonal socket for a torque wrench.

[0047] Considering that the damper body 20 usually needs to rotate at the bottom, in order to prevent the anti-loosening mechanism 40 from affecting the rotation of the damper body 20, the anti-loosening mechanism 40 can be designed to be detachable. Figure 1 、 Figure 2 and Figure 3In some possible embodiments, an annular limiting groove 121 is defined on the inner wall of the mounting hole 12. The limiting groove 121 is located on a side of the damper body 20 adjacent to the mounting hole 12. The anti-loosening mechanism 40 includes a limiting member 41, a clamping plate 42, and an adjusting screw 43. The limiting member 41 is detachably disposed within the limiting groove 121, forming an adjustment cavity between the limiting member 41 and the damper body 20. The clamping plate 42 is disposed within the adjustment cavity and abuts against a side of the limiting member 41 adjacent to the damper body 20. The clamping plate 42 is defined by an adjusting hole 421 extending through the thickness of the clamping plate 42 and having an internal thread. The screw end of the adjusting screw 43 is threadedly engaged with the adjusting hole 421, and the end of the adjusting screw 43 abuts against the damper body 20.

[0048] In this embodiment, the limiting member 41 can be a retaining spring, a retaining pin, a retaining plate, or other components. The limiting member 41 is detachably disposed in the retaining groove 121. When the damper body 20 needs to be rotated, the anti-loosening mechanism 40 can be conveniently removed. The clamping plate 42 is movably disposed in the adjustment cavity. The clamping plate 42 can be in a shape such as a strip or a circle. After the damper body 20 is installed, the clamping plate 42 and the limiting member 41 are sequentially installed in place, and then the adjusting screw 43 is rotated to press against the bottom of the damper body 20. Under the action of the reaction force, the clamping plate 42 is pressed against the limiting member 41. In this embodiment, the damper body 20 is prevented from loosening by the limiting member 41, the clamping plate 42, and the adjusting screw 43. The structure is simple, the installation and disassembly are convenient, and the damper body 20 can be effectively prevented from loosening due to vibration.

[0049] See also Figure 3 In some possible embodiments, the card plate 42 is a long strip-shaped component, and a plurality of adjustment holes 421 are provided on the card plate 42. The plurality of adjustment holes 421 are spaced apart along the length direction of the card plate 42, and a plurality of adjustment screws are provided in a one-to-one correspondence with the adjustment holes 421, which helps to make the card plate 42 and the damper bear the force evenly.

[0050] See also Figure 1 、 Figure 3 and Figure 4 In some possible embodiments, a positioning boss 13 is formed on the housing 10. The positioning boss 13 is annular and protrudes from the outer peripheral wall of the housing 10. The positioning boss 13 is used to cooperate with the protective shell 80 to facilitate positioning during installation.

[0051] See also Figure 1 and Figure 2 In some possible embodiments, the sealing portion 21 is provided with a plurality of sealing grooves 211 along its own axial direction, and the sealing elements 30 correspond to the sealing grooves 211 one by one. The plurality of sealing elements 30 helps to improve the sealing protection effect.

[0052] See also Figure 1 and Figure 4In some possible embodiments, the damper body 20 is a squeeze film damper, and a shaft socket 212 adapted to the spiral groove dynamic pressure bearing 60 is provided on the top of the squeeze film damper.

[0053] See also Figure 1 、 Figure 2 and Figure 4 In some cases, the sealing element 30 is an O-ring, which is used to seal the joint surface of the damper body 20 and the housing 10, ensuring that the inner cavity where the flywheel rotor 50 is located is a vacuum environment, reducing the energy loss when the flywheel rotor 50 rotates at high speed, and improving the energy storage efficiency.

[0054] It can be understood that the various parts in the above embodiments can be freely combined or deleted to form different combination embodiments. The specific contents of each combination embodiment will not be repeated here. After this description, it can be considered that the specification of the utility model has recorded various combination embodiments and can support different combination embodiments.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A damper for a flywheel energy storage system, characterized in that: include: A housing, wherein the housing is hollow and has a receiving cavity formed therein, the receiving cavity runs through the axial direction of the housing, one axial end of the housing is provided with a mounting hole connected to the receiving cavity, the inner diameter of the mounting hole is larger than the inner diameter of the receiving cavity, and the mounting hole has an internal thread; A damper body, comprising a sealing portion and a connecting portion, wherein the sealing portion and the connecting portion are connected along the axial direction of the damper body, the sealing portion is slidably matched with the inner wall of the accommodating cavity, an annular sealing groove is formed on the outer peripheral wall of the sealing portion, and the connecting portion is threadedly matched with the mounting hole; and The sealing element is annular and arranged in the sealing groove.

2. The damper for a flywheel energy storage system according to claim 1, characterized in that: The damper for the flywheel energy storage system also includes an anti-loosening mechanism, which is arranged on the shell and abuts against one end of the damper body adjacent to the mounting hole, and is used to apply a pre-tightening force to the damper body to move into the accommodating cavity.

3. The damper for a flywheel energy storage system according to claim 2, characterized in that: An annular limiting groove is provided on the inner wall of the mounting hole, and the limiting groove is located on a side of the damper body adjacent to the mounting hole, and the anti-loosening mechanism includes: A limiting member is detachably disposed in the limiting groove, and an adjustment cavity is formed between the limiting member and the damper body; A clamping plate is disposed in the adjustment cavity and abuts against a side of the stopper adjacent to the damper body, the clamping plate is provided with an adjustment hole, the adjustment hole runs through the thickness direction of the clamping plate, and the adjustment hole has an internal thread; and An adjusting screw is threadably engaged with the adjusting hole, and an end of the adjusting screw abuts against the damper body.

4. The damper for a flywheel energy storage system according to claim 3, characterized in that: The limiting member is a retaining spring.

5. The damper for a flywheel energy storage system according to claim 3, characterized in that: The card plate is provided with a plurality of the adjustment holes, which are arranged at intervals along the length direction of the card plate, and a plurality of the adjustment screws are provided in a one-to-one correspondence with the adjustment holes.

6. The damper for a flywheel energy storage system according to claim 1, characterized in that: A positioning boss is formed on the shell. The positioning boss is annular and protrudes from the outer peripheral wall of the shell.

7. The damper for a flywheel energy storage system according to claim 1, characterized in that: The sealing portion is provided with a plurality of sealing grooves along its axial direction, and the sealing elements correspond to the sealing grooves one by one.

8. The damper for a flywheel energy storage system according to claim 1, characterized in that: The damper body is a squeeze film damper.

9. The damper for a flywheel energy storage system according to claim 8, characterized in that: The top of the squeeze film damper is provided with a shaft socket matched with the spiral groove dynamic pressure bearing.

10. The damper for a flywheel energy storage system according to claim 1, characterized in that: The sealing element is an O-ring.

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