Hydrogen filling port pressing device of hydrogen energy automobile

By designing a structure including hydrogen refueling pipe, cap, sealing groove and other components in the hydrogen refueling port pressing device of hydrogen energy vehicles, the problem of poor sealing of existing devices is solved, and efficient sealing of hydrogen refueling port is achieved, avoiding hydrogen leakage and extending the car's endurance.

CN119508729APending Publication Date: 2025-02-25ANHUI JIANGHUAI AUTOMOBILE GRP CORP LTD
View PDF 7 Cites 0 Cited by

Patent Information

Application Number
CN202411812570.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-10
Publication Date
2025-02-25

AI Technical Summary

Technical Problem

The existing hydrogen energy vehicle hydrogen refueling port pressing device has poor sealing properties, which leads to easy leakage of hydrogen and reduces the battery life of the car.

Method used

A hydrogen energy vehicle hydrogen refueling port pressing device is designed, and adopts a structure including a hydrogen refueling pipe, a cap, a first connection piece, a connecting piece, a sealing groove, a first spring, a first sealing gasket, a second sealing gasket, a plug, a snap, a socket and a slit groove. Through the cooperation of these components, the sealing of the hydrogen refueling port is realized.

Benefits of technology

By improving sealing, hydrogen leakage is avoided, the endurance of hydrogen-energy vehicles is extended, and the use value is improved.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN119508729A_ABST
    Figure CN119508729A_ABST
Patent Text Reader

Abstract

The invention discloses a hydrogen energy automobile hydrogenation port pressing device which comprises a hydrogenation pipe, a gland is arranged at one end of the hydrogenation pipe, a first connecting piece is arranged at the top of the end, close to the gland, of the hydrogenation pipe, a connecting block is rotationally arranged in the first connecting piece and connected with the gland, and a sealing groove is formed in the end, close to the gland, of the hydrogenation pipe. A first spring and a first sealing gasket are arranged in the sealing groove, a second sealing gasket is arranged on the side, close to the hydrogenation pipe, of the gland, an insertion block is arranged at the bottom of the gland, a buckle is arranged at the front end of the insertion block, a socket is arranged at the bottom of the hydrogenation pipe, a clamping groove is formed in the front end of the socket, and the buckle and the clamping groove are fixed in a clamped mode. According to the energy automobile hydrogen filling port pressing device, sealing and fixing can be completed only by pressing the gland to drive the insertion block to be inserted into the socket and the buckle to be clamped into the clamping groove, the sealing performance of the structure is improved, hydrogen leakage is avoided, and the use value of a hydrogen energy automobile is improved.
Need to check novelty before this filing date? Find Prior Art

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen energy vehicles, and more specifically, to a hydrogen filling port pressing device for a hydrogen energy vehicle. Background Art

[0002] A hydrogen-powered car is a car that uses hydrogen as its energy source, converting the chemical energy generated by hydrogen reactions into mechanical energy to propel the vehicle. Hydrogen-powered cars need to be filled with hydrogen when in use.

[0003] The current hydrogen fueling port compression devices for hydrogen-powered vehicles still have some defects. Most of them have poor sealing. Since hydrogen is easy to leak, insufficient sealing may reduce the vehicle's endurance.

[0004] Therefore, there is an urgent need for a hydrogen fueling port pressing device for a hydrogen energy vehicle. Summary of the invention

[0005] The purpose of the present invention is to provide a hydrogen fueling port pressing device for a hydrogen energy vehicle to solve the above-mentioned problems in the prior art, improve the sealing performance and avoid hydrogen leakage.

[0006] The present invention provides a hydrogen fueling port pressing device for a hydrogen energy vehicle, which comprises: a hydrogenation pipe, a gland is provided at one end of the hydrogenation pipe, a first connecting piece is provided at the top of one end of the hydrogenation pipe close to the gland, a connecting block is rotatably provided inside the first connecting piece, the connecting block is connected to the gland, a sealing groove is provided at one end of the hydrogenation pipe close to the gland, a first spring and a first sealing gasket are provided inside the sealing groove, a second sealing gasket is provided on one side of the gland close to the hydrogenation pipe, an insert block is provided at the bottom of the gland, a buckle is provided at the front end of the insert block, a socket is provided at the bottom of the hydrogenation pipe, a slot is provided at the front end of the socket, and the buckle and the slot are fixed by snapping.

[0007] As described above, in the hydrogen fueling port pressing device for a hydrogen energy vehicle, preferably, the first connecting member is fixedly connected to the hydrogen fueling pipe; the connecting block is rotatably connected to the first connecting member; the pressure cover and the connecting block are fixedly connected; the first spring and the sealing groove are fixedly connected; and the first sealing gasket and the sealing groove are slidably connected.

[0008] As described above, in the hydrogen fueling port pressing device for a hydrogen energy vehicle, preferably, a receiving groove is embedded in the front end of the insert block, a second spring is provided inside the receiving groove, and the second spring is fixedly connected to the receiving groove.

[0009] As described above, in the hydrogen fueling port pressing device for a hydrogen energy vehicle, preferably, a control key is provided inside the card slot, the control key and the card slot are slidably connected, and a sliding groove is provided on the inner wall of the card slot.

[0010] As described above, in the hydrogen fueling port pressing device for a hydrogen energy vehicle, preferably, a slider is provided inside the slide groove, the slider is slidably connected to the slide groove, a third spring is provided on one side of the slider, and the third spring is fixedly connected to the slider.

[0011] As described above, in the hydrogen fueling port pressing device for a hydrogen energy vehicle, preferably, a top plate is provided at one end of the socket close to the pressure cover, the top plate and the socket are slidably connected, a fourth spring is provided on one side of the top plate, and the fourth spring and the top plate are fixedly connected.

[0012] As described above, in the hydrogen fueling port pressing device for a hydrogen energy vehicle, preferably, a third sealing gasket is provided inside the hydrogenation pipe, a sealing plate is provided on one side of the third sealing gasket, and the sealing plate is rotatably connected to the hydrogenation pipe.

[0013] As described above, in the hydrogen fueling port pressing device for a hydrogen energy vehicle, preferably, a fourth sealing gasket is provided on one side of the sealing plate, the fourth sealing gasket is fixedly connected to the sealing plate, and a second connecting piece is provided on one side of the sealing plate.

[0014] As described above, in the hydrogen fueling port pressing device for a hydrogen energy vehicle, preferably, a first mounting block is provided on the inner side of the second connecting member, the first mounting block and the second connecting member are rotatably connected, and a telescopic rod is provided on one side of the first mounting block.

[0015] In the hydrogen fueling port pressing device for a hydrogen energy vehicle as described above, preferably, a fifth spring is sleeved on the surface of the telescopic rod, a third connecting piece is provided on the inner top of the hydrogen fueling pipe, a second mounting block is provided on the inner side of the third connecting piece, and the second mounting block is rotatably connected to the third connecting piece.

[0016] The present invention provides a hydrogen filling port pressing device for a hydrogen energy vehicle. The sealing of the hydrogen filling port is achieved through a first connecting piece, a connecting block, a pressure cover, a sealing groove, a first spring, a first sealing gasket, a second sealing gasket, an insert block, a buckle, a socket and a slot. The pressure cover only needs to be pressed to drive the insert block to be inserted into the interior of the socket, and the buckle is snapped into the interior of the slot to complete the sealing and fixing, thereby improving the sealing performance of the structure, avoiding hydrogen leakage, and improving the use value of the hydrogen energy vehicle. The pressure cover is convenient for opening and closing through the storage groove, the second spring, the control key, the slide groove, the slider and the third spring. When the pressure cover is closed, the insert block is inserted into the interior of the socket, and the buckle is squeezed by the inner wall of the socket and retracted into the interior of the storage groove, while squeezing the second spring. When the buckle moves to the position of the slot, the buckle is snapped into the slot under the reaction force of the second spring. When disassembling, press the control key to push the buckle into the storage slot, then the plug-in block can be pulled out from the inside of the socket to complete the disassembly; through the top plate and the fourth spring, when the plug-in block is inserted into the inside of the socket, the top plate will be squeezed and the fourth spring will be compressed at the same time. When disassembling, the top plate will push the plug-in block out under the reaction force of the fourth spring, and the disassembly is more convenient; the secondary sealing of the hydrogenation tube is realized through the third sealing gasket, the sealing plate, the fourth sealing gasket, the second connecting piece, the two mounting blocks, the telescopic rod and the fourth spring. When the hydrogenation gun is inserted into the inside of the hydrogenation tube, the sealing plate will be pushed open, thereby driving the telescopic rod to contract and compressing the fourth spring at the same time. After the hydrogenation is completed, the hydrogenation gun is pulled out, and the sealing plate will complete the sealing under the reaction force of the fourth spring, thereby reducing the possibility of hydrogen leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be further described below with reference to the accompanying drawings, in which:

[0018] Figure 1 A schematic diagram of the explosion structure of an embodiment of the hydrogen fueling port pressing device for a hydrogen energy vehicle provided by the present invention;

[0019] Figure 2 A schematic diagram of the internal structure of an embodiment of a hydrogen fueling port pressing device for a hydrogen energy vehicle provided by the present invention;

[0020] Figure 3 This is a schematic diagram of the overall structure of an embodiment of a hydrogen fueling port pressing device for a hydrogen energy vehicle provided by the present invention;

[0021] Figure 4 It is a schematic diagram of the cross-sectional structure of the card slot of the present invention;

[0022] Figure 5 For the present invention Figure 1 Schematic diagram of the enlarged structure of part A.

[0023] Explanation of the accompanying drawings: 1-hydrogenation tube, 2-first connecting piece, 3-connecting block, 4-pressure cover, 5-sealing groove, 6-first spring, 7-first sealing gasket, 8-second sealing gasket, 9-insertion block, 10-buckle, 11-socket, 12-slot, 13-storage slot, 14-second spring, 15-control key, 16-slide groove, 17-slider, 18-third spring, 19-top plate, 20-fourth spring, 21-third sealing gasket, 22-sealing plate, 23-fourth sealing gasket, 24-second connecting piece, 25-first mounting block, 26-telescopic rod, 27-fifth spring, 28-third connecting piece, 29-second mounting block. DETAILED DESCRIPTION

[0024] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the present disclosure and its application or use. The present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present disclosure thorough and complete and to fully express the scope of the present disclosure to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the components and steps, the composition of the materials, the numerical expressions and the numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary and not as limiting.

[0025] The words "first", "second" and similar words used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different parts. The words "include" or "comprises" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements. "Up", "down" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0026] In the present disclosure, when a specific component is described as being located between a first component and a second component, there may or may not be an intermediate component between the specific component and the first component or the second component. When a specific component is described as being connected to other components, the specific component may be directly connected to the other components without an intermediate component, or may not be directly connected to the other components but have an intermediate component.

[0027] All terms (including technical terms or scientific terms) used in the present disclosure have the same meanings as those understood by ordinary technicians in the field to which the present disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries, such as general dictionaries, should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined herein.

[0028] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0029] like Figure 1-Figure 5 As shown, the hydrogen fueling port pressing device for a hydrogen energy vehicle provided in this embodiment includes: a hydrogenation tube 1, a gland 4 is provided at one end of the hydrogenation tube 1, a first connecting member 2 is provided at the top of one end of the hydrogenation tube 1 close to the gland 4, a connecting block 3 is rotatably provided inside the first connecting member 2, and the connecting block 3 is connected to the gland 4, a sealing groove 5 is provided at one end of the hydrogenation tube 1 close to the gland 4, a first spring 6 and a first sealing gasket 7 are provided inside the sealing groove 5, a second sealing gasket 8 is provided on one side of the gland 4 close to the hydrogenation tube 1, an insert block 9 is provided at the bottom of the gland 4, a buckle 10 is provided at the front end of the insert block 9, a socket 11 is provided at the bottom of the hydrogenation tube 1, a card slot 12 is provided at the front end of the socket 11, and the buckle 10 and the card slot 12 are fixed by snapping.

[0030] Among them, the first connecting member 2 is fixedly connected to the hydrogenation pipe 1; the connecting block 3 is rotatably connected to the first connecting member 2; the pressure cover 4 is fixedly connected to the connecting block 3; the first spring 6 is fixedly connected to the sealing groove 5; and the first sealing gasket 7 is slidably connected to the sealing groove 5.

[0031] During operation, when the hydrogen filling port pressing device of the hydrogen energy vehicle is used, after the hydrogenation is completed, the hydrogenation gun is pulled out, the pressure cap 4 is pressed, and the connecting block 3 is driven to rotate inside the first connecting member 2, and the plug block 9 is driven to be inserted into the inside of the socket 11. At this time, the buckle 10 will be inserted into the inside of the card slot 12, so that the pressure cap 4 can be fixed, and the hydrogen filling port is sealed at the same time. When the pressure cap 4 is fixed, the second sealing gasket 8 will be inserted into the inside of the sealing groove 5, and the first sealing gasket 7 will be squeezed at the same time, thereby compressing the first spring 6. When the pressure cap 4 is fixed, the first sealing gasket 7 will fit tightly with the second sealing gasket 8 under the reaction force of the first spring 6, which effectively improves the sealing performance of the structure, avoids hydrogen leakage, and improves the use value of the hydrogen energy vehicle. The sealing of the hydrogen filling port is achieved through the first connecting member 2, the connecting block 3, the pressure cover 4, the sealing groove 5, the first spring 6, the first sealing gasket 7, the second sealing gasket 8, the plug-in block 9, the buckle 10, the socket 11 and the slot 12. The pressure cover 4 is pressed to drive the plug-in block 9 to be inserted into the inside of the socket 11, and the buckle 10 is inserted into the inside of the slot 12 to complete the sealing and fixing, thereby improving the sealing performance of the structure.

[0032] Furthermore, a receiving groove 13 is embedded in the front end of the insert block 9, and a second spring 14 is provided inside the receiving groove 13, and the second spring 14 is fixedly connected to the receiving groove 13. When the gland 4 is closed, the insert block 9 is inserted into the inside of the socket 11, and the buckle 10 is squeezed by the inner wall of the socket 11 and retracted into the inside of the receiving groove 13, while squeezing the second spring 14. When the buckle 10 moves to the position of the slot 12, the buckle 10 is snapped into the inside of the slot 12 under the reaction force of the second spring 14, and the fixation is completed.

[0033] Furthermore, a control key 15 is provided inside the card slot 12, and the control key 15 is slidably connected to the card slot 12, and a slide groove 16 is provided on the inner wall of the card slot 12. A slider 17 is provided inside the slide groove 16, and the slider 17 is slidably connected to the slide groove 16. A third spring 18 is provided on one side of the slider 17, and the third spring 18 is fixedly connected to the slider 17. When disassembling the pressure cover 4, the control key 15 is pressed to push the buckle 10 to retract into the storage groove 13, so that the plug 9 can be pulled out from the socket 11, and the disassembly can be completed. When the control key 15 is pressed, the slider 17 will slide inside the slide groove 16, and the third spring 18 will be compressed at the same time. When the control key 15 is released, the slider 17 will be reset under the reaction force of the third spring 18, which is convenient for the next use. Therefore, the receiving groove 13, the second spring 14, the control key 15, the sliding groove 16, the slider 17 and the third spring 18 can facilitate the opening and closing of the pressure cover 4.

[0034] Furthermore, a top plate 19 is provided at one end of the socket 11 close to the gland 4, and the top plate 19 is slidably connected to the socket 11, and a fourth spring 20 is provided on one side of the top plate 19, and the fourth spring 20 is fixedly connected to the top plate 19. Through the top plate 19 and the fourth spring 20, when the plug 9 is inserted into the socket 11, the top plate 19 is squeezed and the fourth spring 20 is compressed at the same time. When the plug 9 is removed, the top plate 19 will push the plug 9 out under the reaction force of the fourth spring 20, making the removal more convenient.

[0035] Furthermore, a third sealing gasket 21 is provided inside the hydrogenation pipe 1, and a sealing plate 22 is provided on one side of the third sealing gasket 21, and the sealing plate 22 is rotatably connected to the hydrogenation pipe 1. A fourth sealing gasket 23 is provided on one side of the sealing plate 22, and the fourth sealing gasket 23 is fixedly connected to the sealing plate 22, and a second connecting member 24 is provided on one side of the sealing plate 22. Furthermore, a first mounting block 25 is provided on the inner side of the second connecting member 24, and the first mounting block 25 is rotatably connected to the second connecting member 24, and a telescopic rod 26 is provided on one side of the first mounting block 25. A fifth spring 27 is sleeved on the surface of the telescopic rod 26, and a third connecting member 28 is provided on the inner top of the hydrogenation pipe 1, and a second mounting block 29 is provided on the inner side of the third connecting member 28, and the second mounting block 29 is rotatably connected to the third connecting member 28. The secondary sealing of the hydrogenation tube 1 is achieved by means of the third sealing gasket 21, the sealing plate 22, the fourth sealing gasket 23, the second connecting piece 24, the two mounting blocks (the first mounting block 25 and the second mounting block 29), the telescopic rod 26 and the fifth spring 27. When the hydrogenation gun is inserted into the interior of the hydrogenation tube 1, the sealing plate 22 will be pushed open, thereby driving the telescopic rod 26 to contract and compressing the fifth spring 27 at the same time. After the hydrogenation is completed, the hydrogenation gun is pulled out, and the sealing plate 22 will complete the sealing under the reaction force of the fifth spring 27, thereby reducing the possibility of hydrogen leakage.

[0036] The hydrogen filling port pressing device for a hydrogen energy vehicle provided in an embodiment of the present invention realizes the sealing of the hydrogen filling port through a first connecting piece, a connecting block, a pressure cover, a sealing groove, a first spring, a first sealing gasket, a second sealing gasket, an insert block, a buckle, a socket and a slot. The pressure cover only needs to be pressed to drive the insert block to be inserted into the interior of the socket, and the buckle is snapped into the interior of the slot to complete the sealing and fixing, thereby improving the sealing performance of the structure, avoiding hydrogen leakage, and improving the use value of the hydrogen energy vehicle. The pressure cover is convenient for opening and closing through the storage groove, the second spring, the control key, the slide groove, the slider and the third spring. When the pressure cover is closed, the insert block will be inserted into the interior of the socket, and the buckle will be squeezed by the inner wall of the socket and will be retracted into the interior of the storage groove, while squeezing the second spring. When the buckle moves to the position of the slot, the buckle will be snapped under the reaction force of the second spring. When the plug is inserted into the slot, it can be fixed. When disassembling, press the control key to push the buckle to retract into the storage slot, so that the plug can be pulled out from the inside of the socket to complete the disassembly; through the top plate and the fourth spring, when the plug is inserted into the inside of the socket, the top plate will be squeezed and the fourth spring will be compressed at the same time. When disassembling, the top plate will push the plug out under the reaction force of the fourth spring, and the disassembly is more convenient; through the third sealing gasket, the sealing plate, the fourth sealing gasket, the second connecting piece, the two mounting blocks, the telescopic rod and the fourth spring, the secondary sealing of the hydrogenation tube is realized. When the hydrogenation gun is inserted into the hydrogenation tube, the sealing plate will be pushed open, thereby driving the telescopic rod to shrink and compressing the fourth spring at the same time. After the hydrogenation is completed, the hydrogenation gun is pulled out, and the sealing plate will complete the sealing under the reaction force of the fourth spring, thereby reducing the possibility of hydrogen leakage.

[0037] So far, various embodiments of the present disclosure have been described in detail. In order to avoid obscuring the concept of the present disclosure, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed here.

[0038] Although some specific embodiments of the present disclosure have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. A hydrogen fueling port pressing device for a hydrogen energy vehicle, characterized in that: include: A hydrogenation tube, wherein a gland is provided at one end of the hydrogenation tube, a first connecting piece is provided at the top of one end of the hydrogenation tube close to the gland, a connecting block is rotatably provided inside the first connecting piece, and the connecting block is connected to the gland, a sealing groove is provided at one end of the hydrogenation tube close to the gland, a first spring and a first sealing gasket are provided inside the sealing groove, a second sealing gasket is provided on one side of the gland close to the hydrogenation tube, an insert block is provided at the bottom of the gland, a buckle is provided at the front end of the insert block, a socket is provided at the bottom of the hydrogenation tube, a slot is provided at the front end of the socket, and the buckle and the slot are fixed by snapping.

2. The hydrogen fueling port pressing device for a hydrogen energy vehicle according to claim 1, characterized in that: The first connecting piece is fixedly connected to the hydrogenation pipe; the connecting block is rotatably connected to the first connecting piece; the gland is fixedly connected to the connecting block; the first spring is fixedly connected to the sealing groove; and the first sealing gasket is slidably connected to the sealing groove.

3. The hydrogen fueling port pressing device for a hydrogen energy vehicle according to claim 1, characterized in that: A receiving groove is embedded in the front end of the insert block, a second spring is arranged inside the receiving groove, and the second spring is fixedly connected to the receiving groove.

4. The hydrogen fueling port pressing device for a hydrogen energy vehicle according to claim 1, characterized in that: A control key is arranged inside the card slot, the control key is slidably connected to the card slot, and a sliding groove is arranged on the inner wall of the card slot.

5. The hydrogen fueling port pressing device for a hydrogen energy vehicle according to claim 4, characterized in that: A sliding block is provided inside the sliding groove, and the sliding block is slidably connected to the sliding groove. A third spring is provided on one side of the sliding block, and the third spring is fixedly connected to the sliding block.

6. The hydrogen fueling port pressing device for a hydrogen energy vehicle according to claim 1, characterized in that: A top plate is provided at one end of the socket close to the gland, the top plate is slidably connected to the socket, a fourth spring is provided at one side of the top plate, and the fourth spring is fixedly connected to the top plate.

7. The hydrogen fueling port pressing device for a hydrogen energy vehicle according to claim 1, characterized in that: A third sealing gasket is arranged inside the hydrogenation pipe, a sealing plate is arranged on one side of the third sealing gasket, and the sealing plate is rotatably connected to the hydrogenation pipe.

8. The hydrogen fueling port pressing device for a hydrogen energy vehicle according to claim 7, characterized in that: A fourth sealing gasket is provided on one side of the sealing plate, the fourth sealing gasket is fixedly connected to the sealing plate, and a second connecting piece is provided on one side of the sealing plate.

9. The hydrogen fueling port pressing device for a hydrogen energy vehicle according to claim 8, characterized in that: A first mounting block is disposed on the inner side of the second connecting member, the first mounting block is rotatably connected to the second connecting member, and a telescopic rod is disposed on one side of the first mounting block.

10. The hydrogen fueling port pressing device for a hydrogen energy vehicle according to claim 9, characterized in that: A fifth spring is sleeved on the surface of the telescopic rod, a third connecting piece is provided on the inner top of the hydrogenation pipe, a second mounting block is provided on the inner side of the third connecting piece, and the second mounting block is rotatably connected to the third connecting piece.

Citation Information

Patent Citations

  • Fuel tank opening-closing device

    CN101823427A

  • Oil tank sealing device

    CN111572338A

  • Fuel tank filler structure

    CN211000916U

  • Waterproof and dustproof device of automobile oil filler box

    CN220720807U

  • Wide-angle lightning camera device

    CN221081423U