Composite seal gas spring piston structure

Abstract

This utility model relates to the field of shock absorber technology, specifically to a composite sealing gas spring piston structure, comprising: a housing, wherein a sealing device is provided inside the housing. An expansion ring, together with an expansion spring, forms a radial dynamic sealing system. Utilizing its pressure-adaptive characteristics, it can fill minute gaps in the inner wall of the housing caused by processing errors or wear, blocking radial gas leakage. Simultaneously, the sealing ring tightly fits the bottom of the housing, and a damping sleeve assists in the sealing. This dual-seal design effectively solves the problem of easy failure of single seals in traditional structures. The damping sleeve, made of a high-damping-coefficient material, can mitigate the impact displacement of the sealing piston when pressure suddenly increases, ensuring smooth transmission. Furthermore, the sliding fit design between the expansion ring and the inner wall of the housing ensures sealing while reducing frictional resistance, allowing the sealing piston to move more smoothly along the inner wall of the housing, meeting the equipment's requirements for transmission efficiency.

Description

Technical Field

[0001] This utility model relates to the field of shock absorber technology, specifically to a composite sealed gas spring piston structure. Background Technology

[0002] In the existing technology, the existing composite sealing gas spring piston structure has obvious shortcomings in practical applications. Most structures rely on a single sealing component to achieve sealing, and radial seals are easily affected by processing errors or long-term wear, resulting in small gaps that lead to gas leakage.

[0003] Therefore, this utility model presents a composite sealing gas spring piston structure. It uses an expansion ring and an expansion spring to construct a radial dynamic seal, and utilizes the pressure adaptive characteristic to fill the gap and solve the radial leakage problem. A damping sleeve buffers the piston displacement, and the combination of the sealing ring and the support spring forms a reliable axial seal to avoid the impact caused by sudden pressure rise. At the same time, the sliding fit between the expansion ring and the inner wall of the housing reduces frictional resistance, improves the shortcomings of the existing technology in sealing reliability, and meets the urgent need of the shock absorber industry for the composite sealing function of the gas spring piston. Utility Model Content

[0004] To address the shortcomings of existing technologies, the technical solution adopted by this utility model to solve its technical problems is: a composite sealing gas spring piston structure, comprising: a housing, wherein a sealing device is provided inside the housing; the sealing device includes a sealing piston, wherein an arc-shaped bevel is formed on the outer wall of the sealing piston.

[0005] An expansion ring is fixedly connected to the outer wall of the arc-shaped bevel. The expansion ring has an annular through-hole inside. During use, the housing acts as a supporting frame, forming a sealed cavity that provides stable installation and movement space for the sealing device. The sealing piston in the sealing device is centrally located, and its arc-shaped bevel, due to its surface adaptability, achieves a tight fixation with the expansion ring, ensuring no relative displacement between the two. The expansion ring is nested within the outer wall of the arc-shaped bevel, and the outer wall maintains sliding contact with the inner wall of the housing, initially establishing a radial seal.

[0006] An expansion spring is fixedly connected to the inner wall of the annular through-hole. The expansion spring in the annular through-hole is in a slightly tense state, providing initial radial support force to the expansion ring through its own elastic tension, further enhancing the fit with the inner wall of the housing. Simultaneously, the damping sleeve and support spring fixed to the outer wall of the sealing piston also perform their respective functions. One end of the damping sleeve is rigidly connected to the sealing ring, while the support spring is in a slightly compressed state, using axial elastic force to push the sealing ring, causing the outer wall of the sealing ring to fit tightly against the inner wall of the bottom end of the housing, forming an initial axial sealing barrier, effectively preventing gas leakage from the gap at the bottom end of the housing.

[0007] The outer wall of the expansion ring is slidably connected to the inner wall of the housing. When compressed gas or other pressure medium is introduced into the gas spring, the pressure acts on the end face of the sealing piston, driving the sealing piston to move axially along the inner wall of the housing. During this process, all components work together to achieve enhanced sealing and stable transmission. In terms of radial sealing, when the sealing piston moves axially, the expansion ring will move synchronously. Due to the sliding friction with the inner wall of the housing, coupled with the radial compression of the expansion ring by the internal pressure, the expansion spring in the annular through hole will be further compressed. The compressed expansion spring will generate a greater radial elastic force, pushing the outer wall of the expansion ring to fit more tightly against the inner wall of the housing. Even if there are small gaps caused by processing errors or wear, they can be effectively filled, forming a dynamic sealing effect of "the higher the pressure, the tighter the seal," completely blocking the possibility of gas leakage from the radial direction.

[0008] A damping sleeve and a support spring are fixedly connected to the outer wall of the sealing piston. A sealing ring is fixedly connected to one end of the outer wall of the damping sleeve. For axial sealing, when the sealing piston moves, the damping sleeve fixed to the outer wall will move synchronously. The damping sleeve is made of a high-damping-coefficient material, which can slow down the movement speed of the sealing piston and prevent impact displacement of the sealing piston due to sudden pressure increases, ensuring the smoothness of the transmission process. Simultaneously, the damping sleeve, together with the sealing piston and the sealing ring, forms a cavity, while the support spring supports the inner wall of the damping sleeve to prevent collapse. Even if the position of the sealing piston changes, the reliability of the axial seal will not be affected, effectively preventing gas leakage from the gap between the sealing piston and the bottom of the housing.

[0009] The outer wall of one end of the support spring and damping sleeve is fixedly connected to the outer wall of the sealing ring, and the outer wall of the sealing ring is fixedly connected to the inner wall of the bottom end of the housing. With the dual protection of radial and axial sealing, the energy of the pressure medium can be transmitted to the sealing piston, driving the sealing piston to move stably along the inner wall of the housing. Moreover, the sliding fit design between the expansion ring and the inner wall of the housing ensures the sealing effect while reducing frictional resistance, ensuring the smoothness of the sealing piston movement, and further improving the stability of the entire structure's transmission.

[0010] The beneficial effects of this utility model are as follows:

[0011] 1. This utility model sets up an expansion ring, which, together with the expansion spring, forms a radial dynamic sealing system. Utilizing the pressure adaptive characteristics, it can fill the tiny gaps in the inner wall of the housing caused by processing errors or wear, blocking radial gas leakage. At the same time, the sealing ring tightly fits the bottom of the housing, and with the damping sleeve assisting in the sealing, the double sealing design effectively solves the problem of easy failure of the single seal in traditional structures.

[0012] 2. By setting a damping sleeve and using a material with a high damping coefficient, this utility model can reduce the impact displacement of the sealing piston when the pressure rises suddenly, ensuring smooth transmission. In addition, the sliding fit design between the expansion ring and the inner wall of the housing ensures sealing while reducing frictional resistance, making the sealing piston move more smoothly along the inner wall of the housing and meeting the equipment's requirements for transmission efficiency. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This is a schematic diagram of the internal structure of this utility model;

[0015] Figure 3 This is a schematic diagram of the sealing device of this utility model;

[0016] Figure 4 yes Figure 3 A magnified view of a portion of point A in the middle.

[0017] In the diagram: 1. Housing; 2. Sealing device; 3. Buffer spring; 20. Sealing piston; 21. Arc-shaped bevel; 22. Expansion ring; 23. Annular through hole; 24. Expansion spring; 25. Damping sleeve; 26. Sealing ring; 27. Support spring. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical applications of the present invention, and to enable those skilled in the art to understand the present invention and design various embodiments with various modifications suitable for a particular purpose.

[0019] Example:

[0020] Please see Figure 1 - Figure 4 This utility model provides a technical solution: a composite sealing gas spring piston structure, including: a housing 1, the inside of the housing 1 is provided with a sealing device 2; the sealing device 2 includes a sealing piston 20, the outer wall of the sealing piston 20 is provided with an arc-shaped bevel 21.

[0021] An expansion ring 22 is fixedly connected to the outer wall of the arc-shaped bevel 21. An annular through hole 23 is opened inside the expansion ring 22. An expansion spring 24 is fixedly connected to the inner wall of the annular through hole 23. The outer wall of the expansion ring 22 is slidably connected to the inner wall of the housing 1.

[0022] A damping sleeve 25 and a support spring 27 are fixedly connected to the outer wall of the sealing piston 20. A sealing ring 26 is fixedly connected to the outer wall of one end of the damping sleeve 25. The outer walls of the support spring 27 and the damping sleeve 25 are fixedly connected to the outer wall of the sealing ring 26. The outer wall of the sealing ring 26 is fixedly connected to the inner wall of the bottom end of the housing 1.

[0023] Working principle:

[0024] In use, the housing 1 serves as the overall supporting frame, forming a sealed cavity inside, providing stable installation and movement space for the sealing device 2. The sealing piston 20 in the sealing device 2 is centrally located, and its outer wall has an arc-shaped bevel 21 that, due to its surface adaptability, is tightly fixed to the expansion ring 22, ensuring that the two do not experience relative displacement. The expansion ring 22 is nested in the outer wall of the arc-shaped bevel 21, and the outer wall maintains sliding contact with the inner wall of the housing 1, initially establishing a radial seal.

[0025] The expansion spring 24 in the annular through-hole 23 is in a slightly tense state, providing initial radial support force to the expansion ring 22 through its own elastic tension, further enhancing the fit with the inner wall of the housing 1. At the same time, the damping sleeve 25 and the support spring 27 fixed to the outer wall of the sealing piston 20 also perform their respective functions. One end of the damping sleeve 25 is rigidly connected to the sealing ring 26, and the support spring 27 is in a slightly compressed state, pushing the sealing ring 26 with axial elastic force, so that the outer wall of the sealing ring 26 fits tightly with the inner wall of the bottom end of the housing 1, forming an initial axial sealing barrier, effectively preventing gas leakage from the gap at the bottom end of the housing 1.

[0026] When compressed gas or other pressure medium is introduced into the gas spring, the pressure acts on the end face of the sealing piston 20, driving the sealing piston 20 to move axially along the inner wall of the housing 1. During this process, all components work together to achieve enhanced sealing and stable transmission. In terms of radial sealing, when the sealing piston 20 moves axially, the expansion ring 22 will move synchronously. Due to the sliding friction with the inner wall of the housing 1, coupled with the radial compression of the expansion ring 22 by the internal pressure, the expansion spring 24 in the annular through hole 23 will be further compressed. The compressed expansion spring 24 will generate a greater radial elastic force, pushing the outer wall of the expansion ring 22 to fit more tightly against the inner wall of the housing 1. Even if there are small gaps caused by processing errors or wear, they can be effectively filled, forming a dynamic sealing effect of "the higher the pressure, the tighter the seal", completely blocking the possibility of gas leakage from the radial direction.

[0027] In terms of axial sealing, when the sealing piston 20 moves, the damping sleeve 25 fixed on the outer wall will move synchronously. The damping sleeve 25 is made of a high damping coefficient material, which can slow down the moving speed of the sealing piston 20 and avoid impact displacement of the sealing piston 20 due to sudden pressure rise, thus ensuring the smoothness of the transmission process. At the same time, the damping sleeve 25, together with the sealing piston 20 and the sealing ring 26, forms a cavity. Meanwhile, the support spring 27 supports the inner wall of the damping sleeve 25 to prevent collapse. Even if the position of the sealing piston 20 changes, the reliability of the axial seal will not be affected, effectively preventing gas leakage from the gap between the sealing piston 20 and the bottom of the housing 1.

[0028] With the dual protection of radial and axial seals, the energy of the pressure medium can be transferred to the sealing piston 20, driving it to move stably along the inner wall of the housing 1. Moreover, the sliding fit design between the expansion ring 22 and the inner wall of the housing 1 not only ensures the sealing effect but also reduces frictional resistance, ensuring the smooth movement of the sealing piston 20 and further improving the stability of the entire structure's transmission.

[0029] Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art and related fields based on the embodiments of this utility model without creative effort should fall within the protection scope of this utility model. Structures, devices, and operating methods not specifically described and explained in this utility model, unless otherwise specified or limited, shall be implemented according to conventional means in the art.

Claims

1. A composite sealed gas spring piston structure, comprising: The housing (1) is characterized in that a sealing device (2) is provided inside the housing (1). The sealing device (2) includes a sealing piston (20), and the outer wall of the sealing piston (20) is provided with an arc-shaped bevel (21).

2. The composite sealing gas spring piston structure according to claim 1, characterized in that: An expansion ring (22) is fixedly connected to the outer wall of the arc-shaped bevel (21), and an annular through hole (23) is provided inside the expansion ring (22).

3. The composite sealing gas spring piston structure according to claim 2, characterized in that: An expansion spring (24) is fixedly connected to the inner wall of the annular through hole (23).

4. The composite sealing gas spring piston structure according to claim 2, characterized in that: The outer wall of the expansion ring (22) is slidably connected to the inner wall of the shell (1).

5. The composite sealing gas spring piston structure according to claim 1, characterized in that: The outer wall of the sealing piston (20) is fixedly connected to a damping sleeve (25) and a support spring (27), and a sealing ring (26) is fixedly connected to one end of the outer wall of the damping sleeve (25).

6. The composite sealing gas spring piston structure according to claim 5, characterized in that: The outer wall of one end of the support spring (27) and damping sleeve (25) is fixedly connected to the outer wall of the sealing ring (26), and the outer wall of the sealing ring (26) is fixedly connected to the inner wall of the bottom end of the housing (1).

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