Integrated combined sealing element for gas-liquid separation

Abstract

The utility model relates to an integrated combined sealing element for gas-liquid separation, which belongs to the field of sealing elements and comprises a cylinder body, a piston body and an integrated combined sealing element, and the integrated combined sealing element comprises two L-shaped sealing guide rings, two L-shaped sealing check ring bodies, an elastic body, a sealing body and a sealing slip ring. According to the integrated combined sealing element for gas and liquid separation, reliable sealing can be achieved under different pressure conditions through the synergistic effect of the elastic body, the sealing sliding ring and the sealing body, and the elastic body provides initial sealing force for the sealing sliding ring at low pressure; under high pressure, along with pressure rise, the elastic body further enhances radial force on the sealing sliding ring, meanwhile, the sealing body optimizes leakage control, hydraulic oil in an oil cavity can be prevented from leaking into an air cavity, the sealing effect of gas-liquid separation is improved, normal and stable operation of the piston type hydraulic energy accumulator is guaranteed, and integrity and stability of the sealing structure are guaranteed. And the sealing failure caused by abrasion and extrusion is reduced.

Description

Technical Field

[0001] This utility model relates to the field of sealing technology, specifically to an integrated combined sealing component for gas-liquid separation. Background Technology

[0002] In hydraulic systems, piston-type hydraulic accumulators play a crucial role. They store energy, absorb pressure pulsations, and compensate for leaks, ensuring the stable operation of the hydraulic system. The gas-liquid separation effect between the oil chamber and the gas chamber directly determines the performance and service life of the accumulator. Traditional piston-type hydraulic accumulators often use a star-shaped combination seal combined with a guide ring to achieve gas-liquid separation. The star-shaped combination seal consists of a specific rubber star ring, a sealing slip ring, and a rubber force-applying element O-ring. This sealing method meets basic sealing requirements to a certain extent. However, with the continuous development of hydraulic technology and the increasing complexity of application scenarios, its drawbacks have gradually become apparent. In actual operation, the piston needs to undergo multiple reciprocating movements, which poses a great challenge to the wear resistance of the seals.

[0003] In existing piston-type hydraulic accumulators, the NBR rubber star ring in the traditional star-shaped combination seal has limited wear resistance and is prone to wear and failure after repeated piston reciprocating motion, causing hydraulic oil in the oil chamber to leak into the air chamber, resulting in accumulator failure. The star-shaped combination seal and the guide ring need to be installed in different grooves, which increases the piston length. This not only increases the manufacturing difficulty but also hinders cost control and limits the sealing performance of piston-type hydraulic accumulators. Therefore, this application proposes another technical solution to address the above problems. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides an integrated combination seal for gas-liquid separation, which has advantages such as increasing the lifespan of the seal. It solves the problems in existing piston-type hydraulic accumulators where the NBR rubber star ring in the traditional star-shaped combination seal has limited wear resistance and is prone to wear and failure after repeated piston reciprocating motion, leading to hydraulic oil leakage from the oil chamber to the gas chamber and causing accumulator failure. The star-shaped combination seal and the guide ring need to be installed in different grooves, which increases the piston length.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an integrated combined seal for gas-liquid separation, comprising a cylinder body, a piston body, and an integrated combined seal, wherein a groove is formed in the central region of the top of the piston body, and the integrated combined seal is located inside the groove;

[0006] The integrated combination seal includes two L-shaped sealing guide rings, two L-shaped sealing retaining rings, one elastomer, one sealing body, and one sealing slip ring;

[0007] The elastomer is located on the inner bottom wall of the piston body groove. The two L-shaped sealing retaining rings are located on the left and right sides of the elastomer and are in contact with the inner wall of the piston body. The two L-shaped sealing guide rings are located on the adjacent side of the two L-shaped sealing retaining rings and are in contact with the inner wall of the piston body. The sealing slip ring is located between the two L-shaped sealing retaining rings and is in contact with the top of the elastomer. The sealing element is installed on the top of the sealing slip ring.

[0008] Optionally, the L-shaped sealing retainer and the L-shaped sealing guide ring are matched in shape to form an L-shape, and the L-shaped sealing retainer and the L-shaped sealing guide ring are tightly fitted with the piston body and the cylinder body.

[0009] By adopting the above technical solution, it is ensured that there is no metal-to-metal hard friction between the cylinder and the piston, thus avoiding damage to the cylinder and piston.

[0010] Optionally, the elastomer and the sealing slip ring have the same width, and the bottom edge of the sealing retaining ring is flush with the bottom edge of the elastomer.

[0011] By adopting the above technical solution, the fluid pressure can be effectively distributed evenly on the sealing interface, reducing local high-pressure areas and enabling effective tight sealing.

[0012] Optionally, the sealing body is a polyurethane sealing gasket, the sealing body is triangular in shape and the hypotenuse of the triangle is arc-shaped, the top of the sealing slip ring is provided with a fixing groove, and the sealing body is embedded in the sealing slip ring through the fixing groove.

[0013] By adopting the above technical solution, it can quickly restore its original shape after being subjected to external force, maintain good sealing performance, and maintain flexibility even in low temperature environments, making it less prone to brittleness and breakage.

[0014] Optionally, the sealing slip ring is made of polytetrafluoroethylene and copper powder, and the L-shaped sealing retaining ring body is made of polyoxymethylene (POM).

[0015] By adopting the above technical solutions, the products exhibit excellent wear resistance, high hardness, low coefficient of friction, and good dimensional stability, which can significantly extend service life, reduce replacement frequency, and lower maintenance costs.

[0016] Optionally, the cross-section of the elastomer is square, and the side of the elastomer near the sealing slip ring is arc-shaped. The elastic tension of the elastomer provides the initial sealing force for the sealing slip ring.

[0017] By adopting the above technical solution, the uniform tension of the elastomer helps to evenly distribute the pressure on the sealing surface and reduce local high-pressure areas, which helps to prevent excessive wear or damage to the seal.

[0018] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0019] This integrated combination seal for gas-liquid separation achieves reliable sealing under varying pressure conditions through the synergistic action of the elastomer, sealing slip ring, and sealing body. At low pressure, the elastomer provides initial sealing force to the sealing slip ring. Under high pressure, as the pressure increases, the elastomer further enhances the radial force on the sealing slip ring, while the sealing body optimizes leakage control, effectively preventing hydraulic oil from leaking from the oil chamber into the gas chamber. This significantly improves the sealing effect of gas-liquid separation, ensuring the normal and stable operation of the piston-type hydraulic accumulator. The L-shaped sealing retainer effectively prevents the sealing slip ring from being squeezed out of the gap under high pressure, ensuring the integrity and stability of the sealing structure and reducing seal failure caused by wear and extrusion. This allows the sealing force to be evenly applied to the contact interface between the sealing slip ring and the cylinder body. This uniform pressure distribution helps improve the stability and reliability of the seal and reduces the risk of seal failure caused by excessive local pressure. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model;

[0021] Figure 2 This utility model Figure 1 Enlarged structural diagram of integrated combination seal.

[0022] In the diagram: 1. Cylinder body; 2. Piston body; 3. Integrated combination seal; 3a. L-shaped sealing guide ring; 3c. L-shaped sealing retaining ring; 3d. Elastomer; 3e. Sealing body; 3f. Sealing slip ring. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figure 1-2 An integrated combination seal for gas-liquid separation in this embodiment includes a cylinder body 1, a piston body 2, and an integrated combination seal 3. The characteristic feature is that a groove is formed in the central area of ​​the top of the piston body 2, and the integrated combination seal 3 is located inside the groove. This design makes the installation and fixing of the piston body 2 and the integrated combination seal 3 more convenient, ensuring that the seal can be accurately installed and effectively perform its sealing function.

[0025] The piston body 2 can be installed inside the combined seal 3, and the internal space of the combined seal 3 is perfectly matched with the size of the piston body 2. This design helps the piston body 2 to seal more effectively and reduce the possibility of leakage. The integrated combined seal 3 provides a wider range of operating flexibility and is suitable for different operating conditions, including different pressures and speeds, so that the seal can maintain good performance under various working conditions.

[0026] In this embodiment, the integrated combination seal 3 includes two L-shaped sealing guide rings 3a, two L-shaped sealing retaining rings 3c, an elastic body 3d, a sealing body 3e, and a sealing slip ring 3f. The elastic body 3d is located on the inner bottom wall of the groove of the piston body 2. The two L-shaped sealing retaining rings 3c are located on the left and right sides of the elastic body 3d and are in contact with the inner wall of the piston body 2. The two L-shaped sealing guide rings 3a are located on the adjacent side of the two L-shaped sealing retaining rings 3c and are in contact with the inner wall of the piston body 2. The L-shaped sealing retaining rings 3c and the L-shaped sealing slip rings 3f are connected. The guide ring 3a is L-shaped and fits snugly with the piston body 2 and cylinder body 1. The L-shaped sealing ring 3c and the L-shaped sealing guide ring 3a fit tightly with the piston body 2 and cylinder body 1. This ensures the uniformity of force during piston movement and effectively prevents metal-to-metal hard friction that may occur between cylinder body 1 and piston body 2. The design of the L-shaped sealing guide ring 3a and the L-shaped sealing ring 3c makes the force between cylinder body 1 and piston body 2 more uniform, effectively preventing metal-to-metal hard friction, thereby reducing wear and extending the service life of the equipment.

[0027] The sealing slip ring 3f is located between two L-shaped sealing retainer rings 3c and fits against the top of the elastomer 3d. The elastomer 3d and the sealing slip ring 3f have the same width. The bottom edge of the sealing retainer ring 3c is flush with the bottom edge of the elastomer 3d. The sealing body 3e is installed on top of the sealing slip ring 3f. The sealing slip ring 3f is made of polytetrafluoroethylene (PTFE) and copper powder. The addition of copper powder can effectively improve the strength and hardness of the sealing slip ring 3f, thus improving its wear resistance. Furthermore, the addition of copper powder can reduce the coefficient of thermal expansion of the sealing slip ring 3f, allowing it to withstand high pressure and high temperature environments, making it more suitable for hydraulic cylinder and pneumatic cylinder sealing elements. The L-shaped sealing retainer ring 3c is made of polyoxymethylene (POM). Formaldehyde possesses excellent wear resistance and fatigue resistance, enabling the L-shaped sealing ring 3c to maintain its performance even under repeated dynamic loads, reducing wear and extending its service life. Furthermore, the material has extremely low water absorption, helping the L-shaped sealing ring 3c maintain precise dimensions even in humid environments. Copper powder further enhances the fatigue resistance of the sealing slip ring 3f, which significantly extends its service life. The sealing slip ring 3f exhibits greatly increased wear resistance, facilitating a longer service life for both the sealing slip ring 3f and the entire device. The L-shaped sealing ring 3c can be used with the L-shaped sealing guide ring 3a, significantly increasing the strength of the installation and fixing, thus contributing to increased service life and overall device stability.

[0028] In this embodiment, the sealing body 3e is a polyurethane gasket, which is triangular in shape with a rounded hypotenuse. A fixing groove is provided at the top of the sealing slip ring 3f, and the sealing body 3e is embedded in the sealing slip ring 3f through this groove. The sealing body 3e is tightly fitted into the sealing slip ring 3f to optimize leakage control and reduce friction. The elastic body 3d has a square cross-section, and the side of the elastic body 3d closest to the sealing slip ring 3f is rounded. The elastic tension of the elastic body 3d provides the initial sealing force to the sealing slip ring 3f. It can effectively prevent fluid leakage, especially during system startup and initial operation. The elastomer 3d is located between two L-shaped sealing rings 3c. The elastomer 3d and the L-shaped sealing rings 3c are used to evenly distribute the fluid pressure. This design helps to reduce local high-pressure areas and avoid seal failure caused by pressure concentration. The special shape of the L-shaped sealing rings 3c is designed to evenly distribute the fluid and pressure on the elastomer 3d, which can ensure the stability of the sealing performance. The evenly distributed pressure reduces the wear of the seal, thereby improving the service life of the seal.

[0029] The working principle of the above embodiments is as follows:

[0030] This integrated combination seal for gas-liquid separation firstly involves two L-shaped sealing guide rings 3a being positioned on two L-shaped sealing retaining rings 3c and in close contact with the cylinder body 1. During piston movement, the L-shaped sealing guide rings 3a, with their excellent wear resistance, effectively prevent metal-to-metal hard friction that may occur between the cylinder body 1 and the piston body 2, avoiding damage to the cylinder body 1 and the piston body 2, and ensuring the smoothness and stability of the piston body 2's movement.

[0031] The L-shaped sealing ring 3c not only supports and positions the L-shaped sealing guide ring 3a, but its special shape also has the important function of evenly distributing fluid and pressure on the elastomer 3d. When the system starts running and is in a low-pressure or no-pressure state, the elastomer 3d will rebound quickly after being slightly squeezed due to its own elastic properties, thereby providing initial sealing force for the sealing slip ring 3f. This allows the sealing slip ring 3f to fit tightly with the cylinder body 1 before the system has built up a high pressure, thus having a sealing function and effectively preventing gas or liquid leakage between the oil chamber and the air chamber.

[0032] As the system pressure gradually increases, the elastomer 3d is subjected to greater pressure and deformation, which further increases the force on the sealing slip ring 3f. This causes the sealing slip ring 3f to be pressed more tightly onto the cylinder body 1, increasing the radial force and significantly improving the sealing effect. At this time, the characteristics of the sealing slip ring 3f, which is made of polytetrafluoroethylene and copper powder, begin to play a full role. Its high wear resistance can withstand the friction between the piston and the cylinder body 1 during the reciprocating motion, while its anti-extrusion performance ensures that it will not be squeezed out of the sealing gap under high pressure, thus ensuring the reliability and durability of the seal.

[0033] Furthermore, the seal 3e is embedded in the sealing slip ring 3f. Its unique structure and material properties can optimize leakage control. During piston movement, the seal 3e and the cylinder body 1 form an additional sealing barrier, further reducing possible leakage paths of liquid or gas. At the same time, it reduces the friction coefficient between the overall sealing structure and the cylinder body 1, reducing friction loss and energy loss, improving the working efficiency and service life of the piston hydraulic accumulator, and comprehensively ensuring the high efficiency and stability of gas-liquid separation. This integrated combination seal can adapt to the operating requirements of the piston hydraulic accumulator under different working conditions, ensuring the safe and reliable operation of the entire hydraulic system.

Claims

1. An integrated combination seal for gas, liquid separation comprising a cylinder body (1), a piston body (2) and an integrated combination seal (3), characterized in that: The piston body (2) is provided with a groove in the center of the top, and the integrated combination seal (3) is located inside the groove. The integrated combination seal (3) comprises two L-shaped seal guide rings (3a), two L-shaped seal check ring bodies (3c), one elastic body (3d), one seal body (3e) and one seal sliding ring (3f). The elastic body (3d) is located on the inner bottom wall of the groove of the piston body (2), the two L-shaped seal check ring bodies (3c) are located on the left and right sides of the elastic body (3d), the two L-shaped seal guide rings (3a) are located on the side away from the two L-shaped seal check ring bodies (3c) and are attached to the inner wall of the piston body (2), the seal sliding ring (3f) is located between the two L-shaped seal check ring bodies (3c) and is attached to the top of the elastic body (3d), and the seal body (3e) is installed on the top of the seal sliding ring (3f).

2. An integrated combination seal for gas, liquid separation according to claim 1, characterized in that: The L-shaped seal check ring body (3c) and the L-shaped seal guide ring (3a) are matched in shape, and the L-shaped seal check ring body (3c) and the L-shaped seal guide ring (3a) are tightly attached to the piston body (2) and the cylinder body (1).

3. An integrated combination seal for gas, liquid separation according to claim 1, characterized in that: The width of the elastic body (3d) and the seal sliding ring (3f) is the same, and the bottom edge of the seal check ring body (3c) is flush with the bottom edge of the elastic body (3d).

4. An integrated combination seal for gas, liquid separation according to claim 1, characterized in that: The seal body (3e) is a polyurethane seal gasket, the seal body (3e) is triangular in shape, and the triangular hypotenuse is arc-shaped, the top of the seal sliding ring (3f) is provided with a fixing groove, and the seal body (3e) is embedded on the seal sliding ring (3f) through the fixing groove.

5. An integrated combination seal for gas, liquid separation according to claim 1, characterized in that: The L-shaped seal check ring body (3c) is a POM polyoxymethylene seal ring.

6. An integrated combination seal for gas, liquid separation according to claim 1, characterized in that: The cross section of the elastic body (3d) is square, and the side of the elastic body (3d) close to the seal sliding ring (3f) is arc-shaped.

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