A seal ring for a cylinder piston rod

Abstract

The application relates to an oil cylinder piston rod sealing ring, which comprises a sealing ring body, a buffer groove is formed in one end of the sealing ring body, a hard supporting ring is placed in the buffer groove, the supporting ring is made of hard material, and the supporting ring is abutted and supported on the inner wall of the buffer groove. The application has the effects of reducing damage of a sealing ring lip caused by extrusion into a matching gap, guaranteeing the sealing property of the sealing ring, and prolonging the service life of the sealing ring.

Description

Technical Field

[0001] This application relates to the technical field of sealing ring structures for hydraulic cylinder pistons, and in particular to a sealing ring for a hydraulic cylinder piston rod. Background Technology

[0002] In the structure of a hydraulic cylinder, the piston seal plays a crucial role in maintaining the cylinder's internal sealing and preventing hydraulic oil leakage. Especially in high-pressure hydraulic systems, when the piston rod reciprocates, the oil pressure often reaches very high values. Under this high-pressure environment, the piston seal is subjected to significant radial forces. This causes the lip of the seal to be subjected to intense radial compression, making it prone to deformation.

[0003] Furthermore, with the reciprocating motion of the piston rod, continuous friction is generated between the sealing ring and the piston rod, as well as the inner wall of the cylinder. This friction not only increases the wear on the sealing ring, but also, when combined with the radial force generated by the high pressure, makes the lip of the sealing ring easily squeezed into the mating gaps between the piston and cylinder, or between the piston rod and the sealing mounting groove. Once the sealing ring lip is squeezed into the mating gap, the originally good sealing structure of the sealing ring is damaged, causing hydraulic oil to leak from the gap. This not only reduces the working efficiency of the hydraulic system, but may also cause environmental pollution and safety hazards in the surrounding work area due to hydraulic oil leakage.

[0004] Therefore, in high-pressure hydraulic systems, how to effectively prevent the piston seal lip from being squeezed into the mating gap and damaged, thereby ensuring the sealing performance of the seal and extending its service life, has become an important technical problem that urgently needs to be solved. Summary of the Invention

[0005] In order to reduce the damage caused by the sealing ring lip being squeezed into the mating gap, ensure the sealing performance of the sealing ring, and extend the service life of the sealing ring, this application provides a hydraulic cylinder piston rod sealing ring.

[0006] The hydraulic cylinder piston rod sealing ring provided in this application adopts the following technical solution: A piston rod seal for a hydraulic cylinder includes a seal body, one end of which has a buffer groove. A rigid support ring is placed inside the buffer groove. The support ring is made of a rigid material and abuts against and supports the inner wall of the buffer groove.

[0007] By adopting the above technical solution, the buffer groove allows hydraulic oil to enter the annular groove during use. On the one hand, this reduces the impact of hydraulic oil on the end of the sealing ring. On the other hand, the pressure of the hydraulic oil increases the sealing performance of the lips of the sealing ring on both sides of the buffer groove against the piston rod and the inner wall of the cylinder. The rigid support ring fits against the end face of the sealing ring, which is equivalent to adding support force to the lip of the sealing ring, which can restrain its deformation and ensure that the lip of the sealing ring always maintains a proper contact state with the piston rod or cylinder wall, thus ensuring good sealing performance.

[0008] Optionally, the support ring has an oil passage hole.

[0009] By adopting the above technical solution, when the user uses the oil passage hole on the support ring, the oil can flow more freely on both sides of the sealing ring, so that the pressure in the sealing area can be balanced in time, avoiding excessive reverse pressure caused by trapped oil acting on the lip of the sealing ring, thereby preventing the lip of the sealing ring from being torn or damaged by reverse pressure, and maintaining the normal sealing function of the sealing ring.

[0010] Optionally, stepped grooves are provided on both sides of the inner wall of the buffer groove, which are used to limit the end of the support ring.

[0011] By adopting the above technical solution, the stepped groove can prevent the support ring and the buffer groove from separating during use.

[0012] Optionally, the support ring is configured in a V-shape or a U-shape.

[0013] By adopting the above technical solution, the V-shaped structure allows the support ring to distribute and transmit pressure along its two inclined sides like a wedge when subjected to radial pressure from hydraulic oil. This unique shape can more effectively disperse concentrated forces under high pressure, preventing excessive local pressure from causing the sealing ring lip to be squeezed into the mating gap, thus ensuring that the overall force on the sealing ring is relatively uniform and helping to maintain its good sealing condition. The U-shaped support ring has two relatively parallel sides and an arc-shaped bottom, which allows it to be stably placed in the annular groove, providing reliable radial support. During operation, whether subjected to axial or radial forces, it can maintain its positional stability, thereby ensuring a constant support effect on the sealing ring and avoiding problems such as uneven force on the sealing ring or sealing failure caused by support ring displacement.

[0014] Optionally, the inner wall of the sealing ring is provided with a sealing groove, and an oil seal spring is placed in the sealing groove.

[0015] By adopting the above technical solution, during use, as the sealing ring rubs against the piston rod or sealing surface, wear will gradually occur, leading to an increase in the sealing gap. The oil seal spring, however, can continuously apply a certain radial force due to its elasticity, ensuring that the sealing ring lip remains tightly fitted to the mating parts. Even if the sealing ring experiences some wear, the oil seal spring can effectively compensate for the gap caused by wear, thus maintaining a good sealing effect and reducing the possibility of hydraulic oil leakage.

[0016] Optionally, the inner wall of the sealing ring body near the buffer groove is provided with a notch, and multiple stepped slots are provided in the notch, and a sealing gasket is engaged in the notch.

[0017] By adopting the above technical solution, when the user uses it, the sealing gasket is used to increase the seal between the sealing ring and the piston rod. The pressure of the support ring and the oil pressure in the buffer groove can make the sealing gasket and the piston rod fit tightly, thereby increasing the seal between the sealing ring and the piston rod and preventing oil leakage.

[0018] Optionally, an L-shaped rigid shell is provided on the side of the sealing ring body away from the buffer groove.

[0019] By adopting the above technical solution, during user operation, the sealing ring will withstand high radial pressure from hydraulic oil. The rigid shell can withstand the large pressure, protecting the soft internal parts of the sealing ring. When high-pressure oil is applied, the rigid shell can first resist these pressures, preventing critical parts such as the sealing lip inside the sealing ring from directly bearing excessive impact force. This prevents the sealing ring from being excessively squeezed, deformed, or even damaged due to high pressure, ensuring that the sealing ring can maintain its basic structural integrity under high-pressure conditions. The rigid shell, with its rigidity, can effectively limit the radial displacement of the sealing ring, forming a "barrier" at the surrounding mating gaps, preventing the sealing ring material from being squeezed out into these gaps under pressure. This greatly reduces the possibility of the sealing ring failing due to extrusion and extends the service life of the sealing ring.

[0020] Optionally, the inner wall of the sealing ring is provided with multiple oil storage grooves.

[0021] By adopting the above technical solution, when the user uses the product, the oil needs to form a good oil film between the sealing ring and the piston rod and other sealing components to play a lubricating role, reducing friction and wear. The oil reservoir can provide additional flow channels for the oil, making it easier for the oil to enter the contact interface between the sealing ring and the piston rod. This helps to better form a uniform and stable oil film in these areas, thereby reducing the friction between the two, improving the working efficiency and service life of the sealing ring, and ensuring the long-term stability of the sealing effect. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application; Figure 2 This is a broken view of an embodiment of this application; Figure 3 yes Figure 2 Enlarged view of part A.

[0023] Explanation of reference numerals in the attached drawings: 1. Sealing ring body; 11. Buffer groove; 12. Support ring; 13. Oil passage hole; 14. Step groove; 15. Sealing groove; 16. Oil seal spring; 17. Notch groove; 171. Slot; 18. Sealing gasket; 19. Oil reservoir; 2. Rigid housing. Detailed Implementation

[0024] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0025] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0026] In this application, unless otherwise expressly specified and limited, the "above" or "below" of the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. In the description of this specification, references to terms such as "an embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples.

[0027] This application provides a hydraulic cylinder piston rod sealing ring, referring to... Figure 1 , Figure 2 and Figure 3The system includes a sealing ring body 1, a buffer groove 11, a support ring 12, an oil passage hole 13, a stepped groove 14, a sealing groove 15, an oil seal spring 16, a notch groove 17, a retaining groove 171, a sealing gasket 18, a rigid housing 2, and an oil reservoir 19. The buffer groove 11 is located at one end of the sealing ring body 1. The support ring 12 is placed inside the buffer groove 11 and abuts against the inner wall of the buffer groove 11. The oil passage hole 13 is located on the support ring 12. The stepped groove 14 is located on both sides of the inner wall of the buffer groove 11. The sealing groove 15 is located on... The inner wall of the sealing ring has an oil seal spring 16 placed in the sealing groove 15, a notch 17 formed on the inner wall of the sealing ring body 1 near the buffer groove 11, a retaining groove 171 formed in the notch 17, a sealing gasket 18 engaged in the notch 17, a rigid housing 2 positioned on the side of the sealing ring body 1 away from the buffer groove 11, and an oil reservoir 19 formed on the inner wall of the sealing ring. This effectively prevents the lip of the cylinder piston sealing ring from being squeezed into the mating gap and damaged, ensuring the sealing performance of the sealing ring and extending its service life. This is because these structures work together to enhance the performance of the sealing ring from different aspects. The buffer groove 11 and the support ring 12 can relieve pressure and constrain deformation, the oil passage 13 balances pressure, the stepped groove 14 fixes the support ring 12, the oil seal spring 16 compensates for wear gaps, the sealing gasket 18 increases sealing, the rigid housing 2 resists pressure and restricts displacement, and the oil reservoir 19 promotes oil film formation.

[0028] Specifically, the buffer groove 11 is an annular groove formed at one end of the sealing ring body 1 through machining or other means. The shape of the buffer groove 11 is usually a regular ring, and its size and depth are determined according to the specific specifications of the sealing ring and the application scenario. Replaceable structures for the buffer groove 11 can be multiple evenly distributed arc-shaped grooves, etc. The function of the buffer groove 11 is to facilitate the entry of hydraulic oil, thereby mitigating the impact of hydraulic oil on the end of the sealing ring and increasing the sealing performance of the sealing ring lip using hydraulic oil pressure.

[0029] The support ring 12 is made of a rigid material, such as rigid plastic or metal. The support ring 12 is V-shaped or U-shaped. The V-shaped support ring 12 acts like a wedge, distributing and transmitting radial pressure along its inclined sides. The U-shaped support ring 12 has two relatively parallel sides and an arc-shaped bottom, allowing it to be stably placed within the buffer groove 11 to provide reliable radial support. Alternative shapes for the support ring 12 include wavy shapes. The support ring 12 is placed within the buffer groove 11, with its ends tightly abutting against the inner wall of the buffer groove 11 to provide support.

[0030] The oil passage hole 13 is a small hole made on the support ring 12 through drilling or other processes. The number and diameter of the oil passage holes 13 are determined according to actual needs, and their shape is generally circular. Replaceable structures for the oil passage hole 13 can be elongated slits, etc. The function of the oil passage hole 13 is to allow oil to flow freely on both sides of the sealing ring, balance the pressure in the sealing area, and prevent excessive back pressure caused by trapped oil from damaging the lip of the sealing ring.

[0031] The stepped groove 14 is a stepped structure formed on both sides of the inner wall of the buffer groove 11 through machining. The size and depth of the stepped groove 14 must be adapted to the end of the support ring 12 to limit the end of the support ring 12. Replaceable structures for the stepped groove 14 can be protruding blocks, etc. The stepped groove 14 can prevent the support ring 12 from disengaging from the buffer groove 11 and ensure the stability of the support ring 12 within the buffer groove 11.

[0032] The sealing groove 15 is an annular groove formed on the inner wall of the sealing ring. The depth and width of the sealing groove 15 are determined according to the dimensions of the oil seal spring 16, and its shape is a regular ring. Replaceable structures for the sealing groove 15 may include multiple evenly distributed arc-shaped grooves, etc. The sealing groove 15 is used to house the oil seal spring 16, providing an installation position for it.

[0033] The oil seal spring 16 is generally made of metal and has good elasticity. The oil seal spring 16 is helical, and its number of turns and elastic coefficient are designed according to actual requirements. Replaceable structures for the oil seal spring 16 can include elastic rubber strips, etc. The oil seal spring 16 is placed outside the seal; when compressed, it generates elastic force. When installed on the sealing ring, it provides a certain pressure to the sealing ring, thus achieving a sealing function.

[0034] The notch 17 is located on the inner wall of the sealing ring body 1 near the buffer groove 11, and is typically formed by machining or other methods. The notch 17 is usually annular, and its size and depth are determined based on the size and shape of the gasket 18. Replaceable structures for the notch 17 may include recessed areas of other shapes. The function of the notch 17 is to provide installation space for the gasket 18.

[0035] The retaining groove 171 is located inside the notch 17. The retaining groove 171 can be formed during machining and is typically stepped. Its size and spacing are designed according to the structure of the sealing gasket 18. The function of the retaining groove 171 is to hold the sealing gasket 18 in place, ensuring its stable fixation in the appropriate position. Replaceable structures for the retaining groove 171 may include protrusions or other features on the circumference to secure the sealing gasket 18.

[0036] The sealing gasket 18 is typically made of a soft and elastic material such as rubber, and its shape is adapted to the shape of the notch 17. The function of the sealing gasket 18 is to further enhance the sealing effect between the sealing ring and the piston rod. Under the action of the support ring 12 and oil pressure, the sealing gasket 18 can better fit on the piston rod, preventing oil leakage.

[0037] The rigid housing 2 is generally made of hard metal or hard plastic and is L-shaped. Located on the side of the sealing ring body 1 away from the buffer groove 11, the rigid housing 2 can withstand greater pressure. It serves two purposes: firstly, it resists the direct impact of high-pressure oil on the sealing ring; secondly, it restricts the radial displacement of the sealing ring, preventing it from being squeezed into the gap. The edges of the rigid housing 2 are typically smoothly transitioned to avoid scratching other components.

[0038] The oil reservoir 19 is machined into the inner wall of the sealing ring. It can be an annular groove or multiple evenly distributed grooves. The oil reservoir 19 can store a certain amount of oil, which helps to form an oil film between the sealing ring and the piston rod, reducing friction and wear.

[0039] The implementation principle of this embodiment is as follows: through the synergistic effect of the above-mentioned components and structures, the problems faced by the piston seal ring during the reciprocating motion of the piston rod in the high-pressure hydraulic system can be effectively addressed. The buffer groove 11 and the support ring 12 alleviate pressure and constraint deformation, the oil passage 13 balances the pressure, the stepped groove 14 ensures the stability of the support ring 12, the oil seal spring 16 ensures the sealing effect, the sealing gasket 18 enhances the sealing, the rigid housing 2 protects the seal ring and restricts its displacement, and the oil reservoir 19 promotes lubrication. Together, these measures effectively prevent the lip of the cylinder piston seal ring from being squeezed into the mating gap and damaged, ensuring the sealing performance of the seal ring and extending its service life. Compared with the prior art, this greatly improves the working efficiency and stability of the hydraulic system, reduces environmental pollution and safety hazards caused by hydraulic oil leakage, and has strong practicality and innovation.

[0040] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A piston rod seal for a hydraulic cylinder, comprising a seal body (1), characterized in that: A buffer groove (11) is provided at one end of the sealing ring body (1). A rigid support ring (12) is placed in the buffer groove (11). The support ring (12) is made of a rigid material and abuts against the inner wall of the buffer groove (11).

2. The cylinder piston rod sealing ring according to claim 1, characterized in that: An oil passage (13) is provided on the support ring (12).

3. The cylinder piston rod sealing ring according to claim 1, characterized in that: The inner wall of the buffer groove (11) is provided with stepped grooves (14) on both sides, which are used to limit the end of the support ring (12).

4. The cylinder piston rod sealing ring according to claim 1, characterized in that: The support ring (12) is arranged in a V-shape or a U-shape.

5. A cylinder piston rod sealing ring according to claim 1, characterized in that: The inner wall of the sealing ring is provided with a sealing groove (15), and an oil seal spring (16) is placed in the sealing groove (15).

6. A cylinder piston rod sealing ring according to claim 1, characterized in that: The inner wall of the sealing ring body (1) near the buffer groove (11) has a notch (17), and multiple stepped slots (171) are provided in the notch (17). A sealing gasket (18) is engaged in the notch (17).

7. A cylinder piston rod sealing ring according to claim 1, characterized in that: The sealing ring body (1) is provided with an L-shaped rigid shell (2) on the side away from the buffer groove (11).

8. A cylinder piston rod sealing ring according to claim 1, characterized in that: The inner wall of the sealing ring is provided with multiple oil storage grooves (19).

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