Piston valve device for gas spring
By adopting a limiting structure in which the limiting bump and the communication cover is matched in the piston valve device of the gas spring, the problem of poor limiting effect of the valve needle in the prior art under extreme operating conditions is solved, and the stable limiting of the valve needle and the reliability of the device are improved.
Patent Information
- Application Number
- CN202421605166.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-08
- Publication Date
- 2025-06-17
- Estimated Expiration
- 2034-07-08
AI Technical Summary
The existing piston valve device of gas springs can easily cause violent vibration and displacement of the valve needle under extreme operating conditions, and the limiting rubber ring is easily damaged or disengaged, resulting in failure of the limiting effect and the risk of the valve needle falling off.
A piston valve device is designed, and a limiting structure in which the limiting bumps and the communication cover are cooperated. Through the design of the limiting cavity and limiting bumps, the stable limit of the valve needle is achieved to prevent the limiting components from being disengaged.
The stable limit of the valve needle is achieved, the risk of valve needle falling off is reduced, and the performance stability and reliability of the valve device are improved.
Smart Images
Figure CN222992024U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of gas springs, in particular to a piston valve device for a gas spring. Background Art
[0002] In modern industrial applications, gas springs are widely used due to their unique shock absorption, buffering, and supporting functions. Among them, the valve device of the gas spring, as a key component for controlling the flow of oil and regulating the gas spring, the stability and reliability of its performance directly affect the overall working effect of the gas spring. Existing valve devices usually include a valve needle and a piston. The valve needle can slide within the piston and control the on-off of the oil chamber. In order to limit the sliding stroke of the valve needle, a limiting rubber ring is generally provided at the end of the valve needle. The outer diameter of the limiting rubber ring is larger than the inner diameter of the sliding hole, so it can play a limiting role. However, the limiting rubber ring belongs to an interference fit. Under extreme working conditions such as oil impact, the high-speed flow and impact pressure of the oil often cause the valve needle to vibrate and displace violently. The limiting rubber ring is easily damaged in violent collisions or disengaged from the fixed position, resulting in the failure of the limiting effect of the valve needle or even the detachment of the valve needle. Therefore, it is necessary to improve the structure of the piston valve device of the existing gas spring to improve the performance stability and reliability of the valve needle. Summary of the Utility Model
[0003] The technical problem to be solved by the utility model is to provide a piston valve device for a gas spring, which can stably limit the valve needle, avoid the phenomenon of the limiting component coming off, and reduce the risk of the valve needle falling off.
[0004] To solve the above technical problem, the utility model provides a piston valve device for a gas spring, which is arranged in the oil chamber of the gas spring. The oil chamber includes a first chamber and a second chamber, and includes a piston, a valve needle, and a communication cover. The piston is hermetically arranged between the first chamber and the second chamber. A fixed chamber is arranged inside the piston. The communication cover is arranged in the fixed chamber. The valve needle passes through the communication cover and is movably connected with the piston. A valve hole is arranged at the end of the piston. The valve hole can communicate with the second chamber. The valve needle controls the opening and closing of the valve hole. The communication cover can communicate between the valve hole and the first chamber.
[0005] A limiting chamber is arranged inside the communication cover. A limiting convex block is arranged on the valve needle. The limiting convex block is fixed on the side wall of the valve needle. The limiting chamber can limit the moving range of the limiting convex block.
[0006] As an improvement of the above scheme, one side of the limiting chamber close to the first chamber is a first limiting surface, and one side of the limiting chamber close to the second chamber is a second limiting surface. When the valve needle moves in the fixed chamber, the limiting convex block can respectively abut against the first limiting surface and the second limiting surface.
[0007] As an improvement to the above solution, the valve needle includes a limiting portion, the limiting bump is integrally formed with the limiting portion, the limiting bump is provided on the limiting portion and protrudes from the side wall of the limiting portion, the position of the communication cover corresponds to the position of the limiting portion, an inner communication hole is provided on the side wall of the communication cover, the valve hole can communicate with the inner communication hole through the limiting cavity, the communication cover includes a first limiting ring and a second limiting ring, and the first limiting ring and the second limiting ring enclose the limiting cavity.
[0008] As an improvement to the above solution, the first limiting ring is provided on one side of the fixed cavity close to the first cavity, the second limiting ring is provided on one side of the fixed cavity close to the second cavity, the first limiting surface is provided inside the first limiting ring, and the second limiting surface is provided inside the second limiting ring.
[0009] As an improvement to the above solution, the first limiting ring includes a first ring body, a first flange and a first clamping table, the first flange protrudes from the outer side wall of the first ring body and abuts against the inner wall of the fixed cavity, the first clamping table protrudes from the inner side wall of the first ring body, the first limiting surface is provided on the first clamping table, and the first clamping table encloses a first through hole.
[0010] As an improvement to the above solution, the second limiting ring includes a second ring body, a second flange and a second clamping table, the second flange protrudes from the outer side wall of the second ring body and abuts against the inner wall of the fixed cavity, the second clamping table protrudes from the inner side wall of the second ring body, the second limiting surface is provided on the second clamping table, and the second clamping table encloses a second through hole.
[0011] As an improvement to the above solution, the valve needle further includes a blocking portion and a sliding portion, the blocking portion and the sliding portion are respectively provided at both ends of the limiting portion, the blocking portion can be inserted into the valve hole, and the sliding portion can pass through the first through hole and slide in the first through hole.
[0012] As an improvement to the above solution, the limiting bump includes a first abutting surface and a second abutting surface, the first abutting surface can abut against the first limiting surface, the second abutting surface can abut against the second limiting surface, the first abutting surface is parallel to the sliding direction of the valve needle, the second abutting surface is inclined, and the shape of the second through hole corresponds to the shape of the second abutting surface.
[0013] As an improvement to the above solution, the diameters of the blocking portion and the sliding portion are both larger than the diameter of the limiting portion, and the diameter of the limiting bump is larger than the diameters of the first through hole and the second through hole.
[0014] As an improvement of the above solution, an externally communicating hole is provided on the side wall of the piston, and the externally communicating hole can communicate with the internally communicating hole.
[0015] Implementing the present utility model has the following beneficial effects:
[0016] The piston valve device for a gas spring of the present utility model is provided with a piston, a valve needle, and a communicating cover. Among them, the piston is hermetically arranged between the first chamber and the second chamber. A valve hole is provided at the end of the piston, and the valve hole can communicate with the second chamber. The valve needle controls the opening and closing of the valve hole. The communicating cover can communicate between the valve hole and the first chamber. The communicating cover serves to communicate the first chamber and the second chamber. At the same time, the communicating cover also serves as a limiting function. A limiting chamber is provided inside the communicating cover, and a limiting convex block is provided on the valve needle. The limiting convex block is fixed to the side wall of the valve needle. When the valve needle slides inside the piston to control the opening and closing of the valve hole, the limiting chamber can limit the moving range of the limiting convex block. In the piston valve device for a gas spring of the present utility model, by using the limiting convex block in cooperation with the communicating cover that plays a communicating role, the function of front and rear limiting is realized, which can be more stable than the traditional structure of placing a limiting rubber ring, can form stable limiting, avoid the phenomenon of the limiting component coming off, and reduce the risk of the valve needle falling off. Description of the Drawings
[0017] Figure 1 is a partial cross-sectional structural schematic diagram of the piston valve device for a gas spring of the present utility model;
[0018] Figure 2 is a cross-sectional structural schematic diagram of the communicating cover of the present utility model;
[0019] Figure 3 is a structural schematic diagram of the valve needle of the present utility model;
[0020] Figure 4 is a split cross-sectional structural schematic diagram of the piston valve device for a gas spring of the present utility model. Detailed Embodiments
[0021] To make the objectives, technical solutions, and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the drawings. It is hereby declared that the orientation terms such as up, down, left, right, front, rear, inner, and outer that appear or will appear in the text of the present utility model are only based on the drawings of the present utility model, and they do not specifically limit the present utility model.
[0022] See Figure 1, an embodiment of the present utility model discloses a piston valve device for a gas spring, which is arranged in the oil chamber of the gas spring. The oil chamber includes a first chamber 4 and a second chamber 5, and the oil flows between the first chamber 4 and the second chamber 5 through the piston valve device. The piston valve device can control the communication between the first chamber 4 and the second chamber 5. Specifically, the piston valve device for the gas spring includes a piston 1, a valve needle 2 and a communication cover 3. The piston 1 is hermetically arranged between the first chamber 4 and the second chamber 5. A valve hole 12 is provided at the end of the piston 1. The valve needle 2 controls the opening and closing of the valve hole 12. A fixed chamber 11 is arranged in the piston 1. The communication cover 3 is arranged in the fixed chamber 11. The valve needle 2 passes through the communication cover 3 and is movably connected to the piston 1. The valve needle 2 moves in the communication cover 3 to realize the opening and closing of the valve hole 12. When the valve hole 12 is opened, the valve hole 12 can communicate with the second chamber 5, and the communication cover 3 can communicate between the valve hole 12 and the first chamber 4, so that the first chamber 4 communicates with the second chamber 5.
[0023] In order to limit the valve needle 2, a limiting cavity 31 is arranged in the communication cover 3, and a limiting convex block 21 is arranged on the valve needle 2. The limiting convex block 21 is fixed on the side wall of the valve needle 2. When the valve needle 2 slides in the communication cover 3, the limiting cavity 31 can limit the moving range of the limiting convex block 21, so as to achieve the limiting effect. In order to ensure the stability of the limiting convex block 21, the limiting convex block 21 and the valve needle 2 are an integrally formed integral structure.
[0024] The beneficial effects of the embodiment of the present utility model are as follows:
[0025] In the piston valve device for a gas spring according to an embodiment of the present utility model, there are a piston 1, a valve needle 2, and a connecting cover 3. Among them, the piston 1 is sealingly arranged between the first chamber 4 and the second chamber 5. An end portion of the piston 1 is provided with a valve hole 12, and the valve hole 12 can communicate with the second chamber 5. The valve needle 2 controls the opening and closing of the valve hole 12. The connecting cover 3 can be connected between the valve hole 12 and the first chamber 4. The connecting cover 3 plays a role in connecting the first chamber 4 and the second chamber 5. At the same time, the connecting cover 3 also plays a role in limiting. A limiting chamber 31 is arranged inside the connecting cover 3. A limiting protrusion 21 is arranged on the valve needle 2, and the limiting protrusion 21 is fixed on the side wall of the valve needle 2. When the valve needle 2 slides in the piston 1 to control the opening and closing of the valve hole 12, the limiting chamber 31 can limit the moving range of the limiting protrusion 21. In the piston valve device for a gas spring of the present utility model, by using the limiting protrusion 21 to cooperate with the connecting cover 3 that plays a connecting role, the function of front and rear limiting is realized, which can be more stable than the traditional structure of placing a limiting rubber ring, can form stable limiting, avoid the phenomenon that the limiting part 22 comes out, and reduce the risk of the valve needle 2 falling off.
[0026] Specifically, referring to Figure 2 , one side of the limiting chamber 31 close to the first chamber 4 is a first limiting surface 311, and one side of the limiting chamber 31 close to the second chamber 5 is a second limiting surface 312. When the valve needle 2 moves in the fixed chamber 11, the limiting protrusion 21 can respectively abut against the first limiting surface 311 and the second limiting surface 312. Among them, when the limiting protrusion 21 abuts against the first limiting surface 311, the valve hole 12 is in a closed state, and when the limiting protrusion 21 abuts against the second limiting surface 312, the valve hole 12 is in an open state.
[0027] The valve needle 2 includes a limiting part 22. The limiting protrusion 21 and the limiting part 22 are integrally formed. The limiting protrusion 21 is arranged on the limiting part 22 and protrudes from the side wall of the limiting part 22. The position of the connecting cover 3 corresponds to the position of the limiting part 22, so as to be able to limit the limiting part 22. An inner communication hole 32 is arranged on the side wall of the connecting cover 3. The valve hole 12 can communicate with the inner communication hole 32 through the limiting chamber 31. The connecting cover 3 includes a first limiting ring 33 and a second limiting ring 34, and the first limiting ring 33 and the second limiting ring 34 enclose the limiting chamber 31.
[0028] An outer communication hole 13 is arranged on the side wall of the piston 1, and the outer communication hole 13 can be connected to the inner communication hole 32. When the valve hole 12 is open, the oil in the second chamber 5 can enter and exit through the connecting cover 3, and enter and exit the first chamber 4 through the inner communication hole 32 and the outer communication hole 13.
[0029] The connecting cover 3 is formed by fitting the first limiting ring 33 and the second limiting ring 34. The first limiting ring 33 is arranged on one side of the fixed cavity 11 close to the first cavity 4, the second limiting ring 34 is arranged on one side of the fixed cavity 11 close to the second cavity 5, the first limiting surface 311 is arranged on the inner side of the first limiting ring 33, and the second limiting surface 312 is arranged on the inner side of the second limiting ring 34.
[0030] Specifically, referring to Figure 2 , the first limiting ring 33 includes a first ring body 331, a first flange 332 and a first clamping platform 333. The first flange 332 protrudes from the outer wall of the first ring body 331 and abuts against the inner wall of the fixed cavity 11. The first flange 332 forms a fixed connection with the fixed cavity 11. The first clamping platform 333 protrudes from the inner wall of the first ring body 331. The first limiting surface 311 is arranged on the first clamping platform 333. The first clamping platform 333 can form a clamping position for the limiting bump 21, and the first clamping platform 333 encloses a first through hole 334.
[0031] The second limiting ring 34 includes a second ring body 341, a second flange 342 and a second clamping platform 343. The second flange 342 protrudes from the outer wall of the second ring body 341 and abuts against the inner wall of the fixed cavity 11. The second flange 342 forms a fixed connection with the fixed cavity 11. The second clamping platform 343 protrudes from the inner wall of the second ring body 341. The second limiting surface 312 is arranged on the second clamping platform 343. The second clamping platform 343 can form a clamping position for the limiting bump 21, and the second clamping platform 343 encloses a second through hole 344. The valve needle 2 can pass through the first through hole 334 and the second through hole 344 and slide in the first through hole 334 and the second through hole 344.
[0032] Referring to Figure 3 , the valve needle 2 further includes a blocking portion 23 and a sliding portion 24. The blocking portion 23 and the sliding portion 24 are respectively arranged at both ends of the limiting portion 22. The blocking portion 23 can be inserted into the valve hole 12, and the sliding portion 24 can pass through the first through hole 334 and slide in the first through hole 334. Due to the limitation of the limiting boss, the sliding portion 24 cannot enter the second through hole 344, and the limiting portion 22 and the blocking portion 23 cannot enter the first through hole 334.
[0033] Referring to Figure 4, the limiting bump 21 includes a first abutting surface 211 and a second abutting surface 212. The first abutting surface 211 can abut against the first limiting surface 311, and the second abutting surface 212 can abut against the second limiting surface 312. The first abutting surface 211 is parallel to the sliding direction of the valve needle 2. In this way, when subjected to the hydraulic pressure from the second chamber 5, the vertical reaction force formed by the direct contact between the first abutting surface 211 and the first limiting surface 311 can achieve a good blocking effect. The second abutting surface 212 is inclined, and the shape of the second through hole 344 corresponds to the shape of the second abutting surface 212. The hydraulic pressure in the first chamber 4 acts radially on the limiting portion 22 through the internal communication hole 32. When the hydraulic pressure acts on the inclined second abutting surface 212, a component force pointing to the first limiting surface 311 can be generated, thereby increasing the abutting and sealing effect of the first limiting surface 311 on the first abutting surface 211.
[0034] The diameters of the blocking portion 23 and the sliding portion 24 are both larger than the diameter of the limiting portion 22, and the diameter of the limiting bump 21 is larger than the diameters of the first through hole 334 and the second through hole 344. In this way, the limiting portion 22 can pass through the second through hole 344 to realize the communication between the second chamber 5 and the communication cover 3, and the first through hole 334 and the second through hole 344 can limit the limiting bump 21.
[0035] The above are the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art of this technology, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements are also regarded as the protection scope of the present invention.
Claims
1. A piston valve device for a gas spring, arranged in an oil chamber of the gas spring, wherein the oil chamber comprises a first chamber and a second chamber, and is characterized in that: The invention comprises a piston, a valve needle and a connecting cover, wherein the piston is sealed and arranged between the first cavity and the second cavity, a fixed cavity is arranged in the piston, the connecting cover is arranged in the fixed cavity, the valve needle passes through the connecting cover and is movably connected with the piston, a valve hole is arranged at the end of the piston, the valve hole can be connected with the second cavity, the valve needle controls the opening and closing of the valve hole, and the connecting cover can be connected between the valve hole and the first cavity; A limiting cavity is arranged in the connecting cover, a limiting protrusion is arranged on the valve needle, the limiting protrusion is fixed to the side wall of the valve needle, and the limiting cavity can limit the moving range of the limiting protrusion.
2. The piston valve device for a gas spring according to claim 1, characterized in that: The side of the limiting cavity close to the first cavity is the first limiting surface, and the side of the limiting cavity close to the second cavity is the second limiting surface. When the valve needle moves in the fixed cavity, the limiting protrusion can abut against the first limiting surface and the second limiting surface respectively.
3. The piston valve device for a gas spring according to claim 2, characterized in that: The valve needle includes a limiting portion, the limiting protrusion is integrally formed with the limiting portion, the limiting protrusion is arranged on the limiting portion and protrudes from the side wall of the limiting portion, the position of the connecting cover corresponds to the position of the limiting portion, an internal connecting hole is arranged on the side wall of the connecting cover, the valve hole can be connected with the internal connecting hole through the limiting cavity, the connecting cover includes a first limiting ring and a second limiting ring, the first limiting ring and the second limiting ring surround the limiting cavity.
4. The piston valve device for a gas spring according to claim 3, characterized in that: The first limiting ring is arranged on a side of the fixed cavity close to the first cavity, the second limiting ring is arranged on a side of the fixed cavity close to the second cavity, the first limiting surface is arranged on an inner side of the first limiting ring, and the second limiting surface is arranged on an inner side of the second limiting ring.
5. The piston valve device for a gas spring according to claim 3, characterized in that: The first limiting ring includes a first ring body, a first flange and a first clamping platform, the first flange protrudes from the outer wall of the first ring body and abuts against the inner wall of the fixed cavity, the first clamping platform protrudes from the inner wall of the first ring body, the first limiting surface is arranged on the first clamping platform, and the first clamping platform surrounds a first through hole.
6. The piston valve device for a gas spring according to claim 5, characterized in that: The second limiting ring includes a second ring body, a second flange and a second clamping platform. The second flange protrudes from the outer wall of the second ring body and abuts against the inner wall of the fixed cavity. The second clamping platform protrudes from the inner wall of the second ring body. The second limiting surface is arranged on the second clamping platform. The second clamping platform surrounds a second through hole.
7. The piston valve device for a gas spring according to claim 6, characterized in that: The valve needle further includes a blocking portion and a sliding portion, wherein the blocking portion and the sliding portion are respectively arranged at two ends of the limiting portion, the blocking portion can be inserted into the valve hole, and the sliding portion can pass through the first through hole and slide in the first through hole.
8. The piston valve device for a gas spring according to claim 6, characterized in that: The limiting protrusion includes a first abutting surface and a second abutting surface, the first abutting surface can abut against the first limiting surface, the second abutting surface can abut against the second limiting surface, the first abutting surface is parallel to the sliding direction of the valve needle, the second abutting surface is inclined, and the shape of the second perforation corresponds to the shape of the second abutting surface.
9. The piston valve device for a gas spring according to claim 7, characterized in that: The diameters of the blocking portion and the sliding portion are both larger than the diameter of the limiting portion, and the diameter of the limiting protrusion is larger than the diameters of the first through hole and the second through hole.
10. The piston valve device for a gas spring according to claim 3, characterized in that: The side wall of the piston is provided with an outer communicating hole, and the outer communicating hole can be communicated with the inner communicating hole.