Gas-liquid system for gas spring
By introducing a telescopic sealing bag into the gas-liquid system of the gas spring and fixing the inner cylinder into the outer cylinder, the problem of difficult to balance the mobility and sealing of the existing gas spring sealing structure is solved, and efficient sealing and fully rigid support are achieved.
Patent Information
- Application Number
- CN202421605178.4
- 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 sealing structure of the existing gas springs reduces the sealing properties due to the need to take into account mobility, resulting in the risk of oil leakage and gas serialization, and cannot achieve stable and fully rigid support.
By introducing a telescopic sealing bag into the gas-liquid system of the gas spring, the inner cylinder is fixed in the outer cylinder, and the fixed sealing structure is achieved, reducing friction and improving sealing properties.
The fixed seal between the inner cylinder and the outer cylinder is achieved, which reduces the risk of friction and damage, improves the sealing level, avoids oil leakage and gas bursting, and achieves stable fully rigid support.
Smart Images
Figure CN222992016U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of gas springs, in particular to a gas-liquid system for a gas spring. Background Art
[0002] In the existing spring technology field, as an important shock absorption and support device, gas springs have been widely used in industrial production, transportation and daily life. A traditional gas spring mainly consists of a piston rod, a piston, an inner cylinder and an outer cylinder. There are two oil cavities in the inner cylinder, which are controlled by a valve in the piston rod to open and close. The inner cylinder is arranged in the outer cylinder, and there is a gas cavity between the inner cylinder and the outer cylinder. When in use, an external force acts on the piston rod to open the valve, and the two oil cavities can exchange oil. The piston can move between the two oil cavities, and the movement of the piston will compress the gas cavity and support the inner cylinder. After closing the valve, under the action of oil pressure, the piston is locked to form a fixed effect. When the piston rod needs to extend, the valve is opened, and the two oil cavities can exchange oil. The compressed gas cavity will push the inner cylinder to move, thus driving the piston and the piston rod to move, so as to achieve extension. In this process, the oil in the inner cylinder needs to be sealed and isolated from the gas in the outer cylinder. However, since the inner cylinder can move relative to the outer cylinder, a dynamic seal is achieved between the inner cylinder and the outer cylinder, and a floating seal structure is set. However, the floating seal structure is not only prone to wear and failure during movement, but also reduces the sealing performance because it needs to take into account the mobility, and there is a risk of oil leakage and gas leakage. In addition, when the external force exceeds a certain range, the overall structure formed by the piston rod and the inner cylinder can still further compress the gas, resulting in movement. Therefore, only semi-rigid support can be achieved, and stable full-rigid support cannot be achieved. Summary of the Utility Model
[0003] The technical problem to be solved by the utility model is to provide a gas-liquid system for a gas spring, which can fix the inner cylinder to achieve static seal, eliminate the friction between the inner cylinder and the outer cylinder, avoid wear of the seal structure, and extend the service life.
[0004] To solve the above technical problem, the utility model provides a gas-liquid system for a gas spring. The gas spring includes a piston and a piston rod, and includes an inner cylinder and an outer cylinder. The piston is movably arranged in the inner cylinder and divides the inner cavity of the inner cylinder into a first oil cavity and a second oil cavity. One end of the piston rod penetrates into the first oil cavity and is connected to the piston. A valve is arranged in the piston, and the valve is used to control the communication and closing between the first oil cavity and the second oil cavity.
[0005] The inner cylinder is fixed inside the outer cylinder. A first air chamber is provided inside the outer cylinder and is arranged at the side of the inner cylinder. A telescopic seal bladder is also provided inside the outer cylinder. One side of the telescopic seal bladder communicates with the first oil chamber, and the other side communicates with the first air chamber. The telescopic seal bladder can expand and contract.
[0006] As an improvement to the above solution, the telescopic seal bladder is arranged on the outer wall of the inner cylinder and inside the outer cylinder. The inner wall of the telescopic seal bladder and the outer wall of the inner cylinder form a third oil chamber, and the outer wall of the telescopic seal bladder and the inner wall of the outer cylinder form a second air chamber. The third oil chamber communicates with the first oil chamber, and the second air chamber communicates with the first air chamber.
[0007] As an improvement to the above solution, a liquid through-hole is provided on the inner cylinder. The first oil chamber communicates with the third oil chamber through the liquid through-hole.
[0008] As an improvement to the above solution, a support retaining ring is further provided outside the liquid through-hole. The inner ring of the support retaining ring is connected to the outer side wall of the inner cylinder, and the outer ring of the support retaining ring extends obliquely away from the outer side wall of the inner cylinder. The outer ring of the support retaining ring blocks between the inner wall of the telescopic seal bladder and the outer wall of the inner cylinder and leaves a gap with the opening of the liquid through-hole.
[0009] As an improvement to the above solution, a crimping ring is provided at the connection between the inner cylinder and the telescopic seal bladder. The crimping ring is sleeved outside the inner cylinder and inside the outer cylinder. The crimping ring crimps the two ends of the telescopic seal bladder onto the inner cylinder respectively.
[0010] As an improvement to the above solution, crimping grooves are provided on the outer wall surfaces at both ends of the inner cylinder. The crimping grooves are recessed in the outer wall surface of the inner cylinder, and the number of the crimping grooves is multiple. The crimping ring crimps the two ends of the telescopic seal bladder into the crimping grooves at both ends of the inner cylinder respectively.
[0011] As an improvement to the above solution, the gas-liquid system for the gas spring further includes a fixing ring. The fixing ring is fixed inside the outer cylinder and is fixedly connected to one end of the inner cylinder. The end of the outer cylinder away from the piston rod is the outer sealing end. The first air chamber is arranged between the fixing ring and the outer sealing end.
[0012] As an improvement to the above solution, the end of the inner cylinder close to the fixing ring is the inner communication end. An air through-hole is provided in the inner communication end. The second air chamber communicates with the first air chamber through the air through-hole.
[0013] Implementing the present utility model has the following beneficial effects:
[0014] The gas-liquid system for a gas spring of the present utility model is provided with an inner cylinder and an outer cylinder. The gas spring includes a piston and a piston rod. The piston is movably arranged inside the inner cylinder and divides the inner cavity of the inner cylinder into a first oil cavity and a second oil cavity. A first gas cavity is arranged inside the outer cylinder. The inner cylinder is fixed inside the outer cylinder and is stationary relative to the outer cylinder. In order to retain the air pressure effect and enable the piston rod to extend smoothly, a telescopic sealing bladder is further arranged inside the outer cylinder, wherein one side of the telescopic sealing bladder is communicated with the first oil cavity, and the other side of the telescopic sealing bladder is communicated with the first gas cavity. When the piston rod is forced to push into the inner cylinder, the oil liquid in the first oil cavity enters the telescopic sealing bladder, and the telescopic sealing bladder can expand. After expansion, the outer wall thereof is subjected to the pressure of the first gas cavity, and the pressure of the first gas cavity on the telescopic sealing bladder can push the piston rod to extend. Therefore, while retaining the original extending function, the gas-liquid system for a gas spring of the present utility model fixes the inner cylinder inside the outer cylinder, and can change the sealing structure between the inner cylinder and the outer cylinder into a fixed seal, which not only reduces friction, avoids damage to the sealing structure during repeated movement, but also avoids reducing the sealing performance due to considering mobility, eliminates the risks of oil leakage and gas leakage, improves the sealing level, and can also avoid displacement under external impact, realizing stable full-rigid support. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 is a partial sectional structural schematic diagram of the gas-liquid system for a gas spring of the present utility model;
[0016] Figure 2 is Figure 1 a partial enlarged view of A in
[0017] Figure 3 is Figure 1 a partial enlarged view of B in DETAILED DESCRIPTION OF THE EMBODIMENTS
[0018] In order 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 accompanying drawings. It is hereby declared that the upper, lower, left, right, front, rear, inner, outer and other orientation terms that appear or will appear in the text of the present utility model are only based on the accompanying drawings of the present utility model, and they do not specifically limit the present utility model.
[0019] See Figure 1 and Figure 2, an embodiment of the present utility model discloses a gas-liquid system for a gas spring. The gas spring includes a piston 5 and a piston rod 6. The piston 5 is connected to the piston rod 6, and the other end of the piston rod 6 is generally connected to an application end such as a lifting table or chair. The gas-liquid system for the gas spring includes an inner cylinder 1 and an outer cylinder 2. The piston 5 is movably disposed in the inner cylinder 1 and divides the inner cavity of the inner cylinder 1 into a first oil chamber 11 and a second oil chamber 12. One end of the piston rod 6 penetrates into the first oil chamber 11 and is connected to the piston 5. The piston rod 6 can push the piston 5 to move between the first oil chamber 11 and the second oil chamber 12. A valve 51 is provided in the piston 5, and the valve 51 is used to control the communication and closing between the first oil chamber 11 and the second oil chamber 12. When the valve 51 is opened, the first oil chamber 11 and the second oil chamber 12 are communicated, and the piston 5 can move between the first oil chamber 11 and the second oil chamber 12, so that the piston rod 6 can drive the application end to move. When the valve 51 is closed, the volume of the second oil chamber 12 is fixed and the internal oil is difficult to compress, so a locking force can be formed to fix the piston rod 6 and the application end connected to the piston rod 6.
[0020] Conventionally, the inner cylinder 1 is usually disposed inside the outer cylinder 2, and a sliding connection is usually adopted between the inner cylinder 1 and the outer cylinder 2. When the valve 51 between the piston rod 6 and the piston 5 is opened and the piston 5 and the piston rod 6 are pushed into the inner cylinder 1, the oil liquid enters the first oil chamber 11 from the second oil chamber 12. At the same time, since the piston rod 6 entering the first oil chamber 11 occupies the volume of the first oil chamber 11, it is necessary to increase the distance between the outer end of the inner cylinder 1 and the inner end of the outer cylinder 2 to accommodate the oil liquid entering the first oil chamber 11 from the second oil chamber 12. This requires the inner cylinder 1 to move away from the piston rod 6, so a sliding connection structure is adopted between the inner cylinder 1 and the outer cylinder 2. Such a structure requires that the sealing structure between the inner cylinder 1 and the outer cylinder 2 must be a floating structure. The floating structure will cause wear during the repeated movement of the inner cylinder 1. At the same time, in order to meet the movement requirements, a certain gap needs to be maintained between the seal and the inner wall of the outer cylinder 2. Therefore, this sealing structure has certain defects. In order to balance mobility, the sealing performance is reduced, and this defect will cause the gas spring to have the risk of oil leakage and air leakage. Therefore, it is difficult for traditional gas springs to achieve a good balance between mobility and sealing performance.
[0021] In the embodiment of the present utility model, the inner cylinder 1 is fixed inside the outer cylinder 2, and the inner cylinder 1 and the outer cylinder 2 are relatively stationary and will not move inside the outer cylinder 2. In this way, it can be ensured that the structure between the inner cylinder 1 and the outer cylinder 2 is a fixed sealing structure, which will not cause wear and can also improve the sealing performance. In order to achieve mobility at the same time, in the embodiment of the present utility model, a first air chamber 21 is provided inside the outer cylinder 2. The first air chamber 21 is arranged on the side of the inner cylinder 1. A telescopic seal bag 4 is also provided inside the outer cylinder 2. One side of the telescopic seal bag 4 is communicated with the first oil chamber 11, and the oil in the first oil chamber 11 can enter the telescopic seal bag 4. The other side of the telescopic seal bag 4 is communicated with the first air chamber 21, and the gas in the first air chamber 21 can generate air pressure on the outer side of the telescopic seal bag 4, and the telescopic seal bag 4 can expand and contract.
[0022] Specifically, during the process of the piston rod 6 driving the piston 5 into the inner cylinder 1, the valve 51 is opened, and the oil in the second oil chamber 12 enters the first oil chamber 11. Since the piston rod 6 occupies the volume of the first oil chamber 11, and since the inside of the telescopic seal bag 4 is communicated with the first oil chamber 11, the oil in the first oil chamber 11 will enter the telescopic seal bag 4, causing the telescopic seal bag 4 to expand. After expansion, it will generate a certain compression on the gas in the first air chamber 21. When the force of the piston rod 6 plus the force of the external atmospheric pressure is greater than the pressure of the first air chamber 21, the gas in the first air chamber 21 can maintain compression. After the valve 51 is closed, the oil in the second oil chamber 12 is locked and no longer flows, and the oil in the second oil chamber 12 does not generate compression and expansion. Therefore, the piston rod 6 and the piston 5 can be locked in this position. When it is necessary for the piston rod 6 and the piston 5 to extend out of the inner cylinder 1, the valve 51 is opened, and the first oil chamber 11 is communicated with the second oil chamber 12. The telescopic seal bag 4 will transfer the air pressure to the oil. When the pressure of the first air chamber 21 on the telescopic seal bag 4 is greater than the external atmospheric pressure and the force of the piston rod 6, the oil can push the piston rod 6 and the piston 5 to move outward, thereby realizing the extension.
[0023] The beneficial effects of the embodiment of the present utility model are as follows:
[0024] The gas-liquid system for a gas spring in the embodiment of the present utility model is provided with an inner cylinder 1 and an outer cylinder 2. The gas spring includes a piston 5 and a piston rod 6. The piston 5 is movably arranged inside the inner cylinder 1 and divides the inner cavity of the inner cylinder 1 into a first oil chamber 11 and a second oil chamber 12. A first gas chamber 21 is arranged inside the outer cylinder 2. The inner cylinder 1 is fixed inside the outer cylinder 2, and the inner cylinder 1 is stationary relative to the outer cylinder 2. In order to retain the air pressure effect and enable the piston rod 6 to reset smoothly, a telescopic seal bag 4 is further arranged inside the outer cylinder 2, wherein the inside of the telescopic seal bag 4 is communicated with the first oil chamber 11, and the outside of the telescopic seal bag 4 is communicated with the first gas chamber 21. When the piston rod 6 is pushed into the inner cylinder 1 under force, the oil in the first oil chamber 11 enters the telescopic seal bag 4, and the telescopic seal bag 4 can expand. After expansion, the outer wall thereof is subjected to the pressure of the first gas chamber 21, and the pressure of the first gas chamber 21 on the telescopic seal bag 4 can push the piston rod 6 to reset. Therefore, while retaining the original reset function, the gas-liquid system for a gas spring of the present utility model fixes the inner cylinder 1 inside the outer cylinder 2, and can change the sealing structure between the inner cylinder 1 and the outer cylinder 2 into a fixed seal, which not only reduces friction, avoids damage to the sealing structure during repeated movement, but also avoids reducing the sealing performance due to considering mobility, eliminates the risks of oil leakage and gas leakage, improves the sealing level, and can also avoid displacement under external force impact, realizing stable full-rigid support.
[0025] Specifically, referring to Figure 2 , the telescopic seal bag 4 is arranged on the outer wall of the inner cylinder 1 and inside the outer cylinder 2, that is, between the wall surfaces of the inner cylinder 1 and the outer cylinder 2, and the head and tail ends of the telescopic seal bag 4 are hermetically fixed to the head and tail ends of the inner cylinder 1. In this way, a third oil chamber 41 is formed between the inner wall of the telescopic seal bag 4 and the outer wall of the inner cylinder 1, and a second gas chamber 42 is formed between the outer wall of the telescopic seal bag 4 and the inner wall of the outer cylinder 2. The third oil chamber 41 is communicated with the first oil chamber 11, and the second gas chamber 42 is communicated with the first gas chamber 21.
[0026] In order to enable the oil to enter the third oil chamber 41, a liquid through hole 13 is arranged on the inner cylinder 1, and the first oil chamber 11 is communicated with the third oil chamber 41 through the liquid through hole 13. The liquid through hole 13 is arranged at one end of the first oil chamber 11 far from the second oil chamber 12, so as to ensure that when the piston 5 moves to the limit position of the first oil chamber 11, the liquid through hole 13 can still be isolated from the second oil chamber 12, avoiding the oil in the third oil chamber 41 from directly entering the second oil chamber 12.
[0027] In order to ensure that the liquid through hole 13 is always connected between the third oil chamber 41 and the first oil chamber 11, and to prevent the telescopic sealing bag 4 from blocking the liquid through hole 13 when shrinking, a support ring 14 is further provided on the outside of the liquid through hole 13, the inner ring of the support ring 14 is connected to the outer wall of the inner tube 1, and the outer ring of the support ring 14 is inclined and extended in a direction away from the outer wall of the inner tube 1, and the outer ring of the support ring 14 is blocked between the inner wall of the telescopic sealing bag 4 and the outer wall of the inner tube 1 and a gap is reserved with the opening of the liquid through hole 13. The support ring 14 is made of hard material, and can open a certain gap at the connection between the telescopic sealing bag 4 and the inner tube 1, so that the telescopic sealing bag 4 can always keep a distance from the inner tube 1, thereby ensuring the continuous communication of the liquid through hole 13, so that when the telescopic sealing bag 4 shrinks and becomes smaller, the telescopic sealing bag 4 will not be attached to the liquid through hole 13, and the telescopic sealing bag 4 is prevented from blocking the liquid through hole 13. At the same time, the support retaining ring 14 opens a certain space for the telescopic sealing bag 4, which also facilitates the oil to have a larger entry space when entering the telescopic sealing bag 4 from the first oil chamber 11, thereby ensuring a larger flow rate during entry and a quick response.
[0028] In addition, in order to fix the telescopic sealing bag 4, a crimping ring 15 is provided at the connection between the inner tube 1 and the telescopic sealing bag 4. The crimping ring 15 is sleeved outside the inner tube 1 and located inside the outer tube 2. The crimping ring 15 crimps the two ends of the telescopic sealing bag 4 to the inner tube 1 respectively, thereby fixing and sealing the telescopic sealing bag 4.
[0029] Furthermore, in order to achieve better sealing, the outer wall surfaces at both ends of the inner tube 1 are provided with crimping grooves 16, and the crimping grooves 16 are recessed in the outer wall surface of the inner tube 1. The number of the crimping grooves 16 is multiple, and the crimping ring 15 crimps the two ends of the telescopic sealing bag 4 into the crimping grooves 16 at both ends of the inner tube 1 respectively. The telescopic sealing bag 4 is made of soft material. When being pressed by the crimping ring 15, since the crimping grooves 16 are recessed in the outer wall surface of the inner tube 1, the telescopic sealing bag 4 will sink into the crimping grooves 16 to form a multi-layer sealing structure. If fluids such as gas or oil need to pass through the crimping point, they need to pass through the multi-layer sealing structure, thereby forming a good sealing effect.
[0030] See also Figure 3 The gas-liquid system for the gas spring also includes a fixing ring 3, which is fixed in the outer tube 2. The fixing ring 3 is fixedly connected to one end of the inner tube 1. The fixing ring 3 can form a fixed limit for the inner tube 1, and the end of the outer tube 2 away from the piston rod 6 is an outer sealing end 22, and the first air cavity 21 is arranged between the fixing ring 3 and the outer sealing end 22.
[0031] See Figure 3 , one end of the inner cylinder 1 close to the fixing ring 3 is an inner communication end 17, an air through hole 171 is provided in the inner communication end 17, and the second air cavity 42 is communicated with the first air cavity 21 through the air through hole 171, so that the second air cavity 42 can be communicated with the first air cavity 21.
[0032] The above are the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, 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 gas-liquid system for a gas spring, the gas spring comprising a piston and a piston rod, characterized in that: It comprises an inner cylinder and an outer cylinder, wherein the piston is movably arranged in the inner cylinder and divides the inner cavity of the inner cylinder into a first oil cavity and a second oil cavity, one end of the piston rod penetrates into the first oil cavity and is connected to the piston, and a valve is arranged in the piston, and the valve is used to control the connection and closing between the first oil cavity and the second oil cavity; The inner cylinder is fixed in the outer cylinder, a first air cavity is provided in the outer cylinder, the first air cavity is arranged on the side of the inner cylinder, a telescopic sealing bag is also provided in the outer cylinder, one side of the telescopic sealing bag is connected with the first oil cavity, and the other side of the telescopic sealing bag is connected with the first air cavity, and the telescopic sealing bag can be deformed to increase or decrease the volume inside it.
2. The gas-liquid system for a gas spring according to claim 1, characterized in that: The telescopic sealing bag is arranged on the outer wall of the inner tube and is located inside the outer tube. The inner wall of the telescopic sealing bag and the outer wall of the inner tube form a third oil chamber. The outer wall of the telescopic sealing bag and the inner wall of the outer tube form a second air chamber. The third oil chamber is connected to the first oil chamber, and the second air chamber is connected to the first air chamber.
3. The gas-liquid system for a gas spring according to claim 2, characterized in that: The inner cylinder is provided with a liquid through hole, and the first oil chamber is communicated with the third oil chamber through the liquid through hole.
4. The gas-liquid system for a gas spring according to claim 3, characterized in that: A support baffle ring is also provided on the outer side of the liquid through hole, the inner ring of the support baffle ring is connected to the outer side wall of the inner tube, the outer ring of the support baffle ring is inclined and extends in a direction away from the outer side wall of the inner tube, the outer ring of the support baffle ring is blocked between the inner wall of the telescopic sealing bag and the outer wall of the inner tube and retains a gap with the opening of the liquid through hole.
5. The gas-liquid system for a gas spring according to claim 1, characterized in that: A crimping ring is provided at the connection between the inner cylinder and the telescopic sealing bag. The crimping ring is sleeved outside the inner cylinder and located inside the outer cylinder. The crimping ring crimps the two ends of the telescopic sealing bag onto the inner cylinder respectively.
6. The gas-liquid system for a gas spring according to claim 5, characterized in that: The outer wall surfaces at both ends of the inner tube are provided with crimping grooves, which are recessed in the outer wall surface of the inner tube. There are multiple crimping grooves, and the crimping ring crimps the two ends of the telescopic sealing bag into the crimping grooves at both ends of the inner tube respectively.
7. The gas-liquid system for a gas spring according to claim 2, characterized in that: The gas-liquid system for the gas spring also includes a fixing ring, which is fixed in the outer tube and fixedly connected to one end of the inner tube. The end of the outer tube away from the piston rod is an outer sealing end, and the first air cavity is arranged between the fixing ring and the outer sealing end.
8. The gas-liquid system for a gas spring according to claim 7, characterized in that: One end of the inner cylinder close to the fixing ring is an inner communicating end, an air through hole is provided in the inner communicating end, and the second air cavity is communicated with the first air cavity through the air through hole.