A combined sealing ring and a sealing structure

Abstract

The present invention discloses a combined sealing ring and a sealing structure. The combined sealing ring includes a combined sealing ring body, which is composed of a first sealing ring, a second sealing ring, and a highly elastic third sealing ring. The short side of the first sealing ring is placed inside the second sealing ring, and the third sealing ring is located between the first sealing ring and the second sealing ring and inside the second sealing ring; a metal skeleton is embedded in the second sealing ring. The sealing structure includes an upper sealing member and a lower sealing member to form a sealed space. The combined sealing ring is placed in the groove of the lower sealing member and fixed by the buckle on the groove wall. The present invention improves the sealing stability and reliability through the cooperation of the three sealing rings and the sealing structure; the combined sealing ring has the characteristics of detachable assembly and flexible adjustment of the sealing ring wire diameter, and under high-pressure or even ultra-high-pressure conditions, it is not easy to have the phenomenon that the sealing ring is squeezed into the sealing gap, and it is not easy to have the situation of extrusion damage and deformation.

Description

Technical Field

[0001] The present invention relates to a sealing ring, and in particular to a combined sealing ring with better sealing performance, more stability, not easily deformed and can flexibly adjust the size of the sealing ring, belonging to the field of sealing technology. Background Art

[0002] Due to the reciprocating motion between the hydraulic cylinder and the piston rod, there must be a sealing gap, and there is a pressure difference at both ends of the sealing gap, which will cause leakage. This requires the installation of a sealing ring to solve. At present, the widely used sealing rings include O-ring seals, U-ring seals, Y-ring seals, rectangular seals, etc. Each sealing ring has its own unique characteristics, and at the same time, there are also certain disadvantages. Since the working environment and working conditions of the sealing ring are ever-changing, it is necessary to select a suitable type of sealing ring. Moreover, different sizes of sealing rings need to be selected according to different groove sizes; especially in the case of particularly high working pressure, the sealing ring is laterally extruded, and it is easy to occur that the sealing ring is squeezed into the sealing gap, and it is more likely to occur extrusion damage. The material properties and sealing performance of the sealing ring will be greatly challenged. At present, there is a lack of such a sealing ring with better sealing performance, more stability, not easily deformed and can flexibly adjust the size of the sealing ring. Summary of the Invention

[0003] Object of the Invention: The first object of the present invention is to provide a combined sealing ring to solve the existing technical deficiencies, so that the sealing performance of the sealing ring is better, more stable, the size adjustment is more flexible and not easily deformed. The first object of the present invention is to provide a sealing structure for cooperating with the combined sealing ring.

[0004] Technical Solution: The combined sealing ring of the present invention includes a combined sealing ring body, which is characterized in that the combined sealing ring body includes a first sealing ring, a second sealing ring and a third sealing ring. The short side of the first sealing ring is placed inside the second sealing ring, and the third sealing ring is located inside the second sealing ring, separating the first sealing ring from the second sealing ring. A metal skeleton is embedded in the second sealing ring.

[0005] Further, the sealing ring body, the first sealing ring, the second sealing ring and the third sealing ring are all annular structures with different cross-sections.

[0006] Further, the cross-section of the second sealing ring is a square structure with one end open. The two sides of the opening are "L"-shaped barbs, and a second positioning groove is provided at the position corresponding to the opening. A sealing lip integrated with it is provided above the outside of the second sealing ring.

[0007] Further, the cross-section of the first sealing ring is an "I" - shaped structure. The lengths of the two sides of the first sealing ring are different. The length of the upper short side is less than that of the long side. A support arm with a relatively thick width is provided between the short side and the long side. An inner hole is provided in the middle of the long side of the first sealing ring. The two sides of the short side of the first sealing ring are chamfered structures, and their lengths are the same as the lengths of the "L" - shaped barb structures on the second sealing ring. A first positioning groove is provided on the short side of the first sealing ring. The diameter of the first positioning groove is the same as that of the second positioning groove and is slightly larger than the diameter of the third sealing ring.

[0008] Further, the third sealing ring is a detachable sealing ring with different diameter sizes. The third sealing ring is an O - shaped sealing ring, and its material is an elastic rubber material, such as cis - 1,4 - polybutadiene rubber.

[0009] Further, the material of the second sealing ring is in the form of a metal skeleton inside and rubber wrapped outside. The metal skeleton is Hy - 80 steel with relatively high strength.

[0010] Further, the support wall in the middle of the first sealing ring contacts the "L" - shaped barb structure of the second sealing ring to form a sealing structure.

[0011] Further, the material of the sealing lip is a rubber material with relatively high hardness added with graphite.

[0012] Further, the positioning grooves, the positioning grooves and the third sealing ring are on the same vertical line.

[0013] The present invention also includes a sealing structure. The sealing structure includes the combined sealing ring, an upper sealing member and a lower sealing member described in the present invention. The combined sealing ring is placed in the groove of the lower sealing member and fixed by the buckle on the groove wall of the lower sealing member to seal the gap between the upper sealing member (21) and the lower sealing member (22). The width of the groove of the sealing member is greater than the width of the combined sealing ring. The depth of the groove of the sealing member is less than the wire diameter length of the combined sealing ring. The distance from the buckle to the bottom of the groove is equal to the thickness of the long side of the first sealing ring. The two buckles are symmetrically distributed on both sides of the groove.

[0014] For the convenience of installing the combined sealing ring, the opening length formed by the two "L"-shaped barbs of the second sealing ring is equal to the length above the chamfer structure on the short side of the first sealing ring; since the material of the first sealing ring is rubber, when installing the combined sealing ring, only the first sealing ring needs to be extruded to achieve the cooperation between the first and second sealing rings. At the same time, in order to ensure the sealing performance of the sealing ring, the second sealing ring has a structure with a metal skeleton inside and rubber wrapped outside. The short side and the support arm of the first sealing ring are in contact with the two "L"-shaped barbs of the second sealing ring to form a sealing structure, and the length of the support arm is greater than the opening length formed by the two "L"-shaped barbs; the third sealing ring is in a straight vertical line with the positioning groove on the first sealing ring and the sealing ring on the second sealing ring. The two positioning grooves are used to fix the third sealing ring, and the cooperation of the three secondary guarantees the sealing performance of the sealing ring.

[0015] Advantages: Compared with the prior art, the present invention has the following remarkable advantages:

[0016] (1) The combined sealing ring of the present invention realizes the convenient assembly of the sealing ring through the cooperation of three sealing rings; by embedding a metal skeleton with higher strength in the second sealing ring and installing a third sealing ring with better elasticity, the third sealing ring bears most of the deformation of the whole combined sealing ring. Even when subjected to a large lateral pressure, the whole sealing ring will not undergo large deformation or the situation where the sealing ring is squeezed into the gap, and extrusion damage will not occur.

[0017] (2) By replacing the third sealing ring with different sizes, the present invention can achieve the purpose of flexibly adjusting the wire diameter size of the sealing ring, reducing the unnecessary trouble in the process of frequently replacing the sealing ring.

[0018] (3) The combination of the combined sealing ring and the sealing structure of the present invention has excellent working performance under the working conditions of high-pressure and even ultra-high-pressure sealing, with better and more stable sealing performance. Description of the Drawings

[0019] Figure 1 It is a schematic diagram of the overall structure of a combined sealing ring of the present invention;

[0020] Figure 2 It is a sectional view of a combined sealing ring of the present invention;

[0021] Figure 3 It is a two-dimensional sectional view of a combined sealing ring of the present invention;

[0022] Figure 4 It is a schematic diagram of the overall structure of a sealing structure containing a combined sealing ring of the present invention. Detailed Embodiments

[0023] The technical solution of the present invention will be further described below in conjunction with the drawings.

[0024] Example 1

[0025] like Figures 1-3 As shown, a combined sealing ring described in the present invention includes a combined sealing ring body 1), wherein the combined sealing ring body 1 includes three parts: a first sealing ring 11, a second sealing ring 12 and a third sealing ring 13. The short side 113 of the first sealing ring 11 is placed inside the second sealing ring 12, and the third sealing ring 13 is located inside the second sealing ring 12, separating the first sealing ring 11 from the second sealing ring 12. The second sealing ring 12 has an outer layer of rubber and an embedded metal skeleton 124, and its cross-section is a square structure with one end open. There are L-shaped barb structures 123 on both sides of the opening, and a second positioning groove 122 is provided at a position corresponding to the opening. A sealing lip 121 that is integrated with the second sealing ring 12 is provided on the upper outer side of the second sealing ring 12, and the sealing lip 121 is graphite rubber. The cross section of the first sealing ring 11 is an I-shaped, and an inner hole 116 matching the shaft is provided in the middle of the long side of the first sealing ring 11. The short side 113 of the first sealing ring 11 is provided with chamfered structures 111 on both sides, and its length is the same as the length of the L-shaped barb structure 123 on the second sealing ring 12. A first positioning groove 112 is provided on the short side 113 of the first sealing ring 11. The cross section of the third sealing ring 13 is O-shaped. The short side 113 of the first sealing ring 11 is placed inside the second sealing ring 12, and the two L-shaped barb structures 123 on the second sealing ring 12 are in contact with the short side 113 of the first sealing ring 11 and the support arm 115 to form a sealing structure for preventing gas or liquid from entering the interior of the sealing ring during operation. The materials of the sealing ring body 1, the first sealing ring 11, the second sealing ring 12 and the third sealing ring 13 are all rubber materials of annular structure.

[0026] Among them, a metal skeleton 124 is embedded inside the second sealing ring 12. The metal skeleton 124 is made of Hy-80 steel with relatively high strength, so that when the combined sealing ring body 1 bears high pressure and ultra-high pressure, the sealing ring material will not be squeezed into the sealing gap, and the whole will not undergo large deformation or sealing ring extrusion failure. There is a sealing lip 121 above, which is used to contact and rub against the hole during the working process. The tip of the sealing lip 121 is relatively blunt, reducing the wear between the sealing lip and the hole, reducing the frictional force during the working process. The sealing lip 121 has relatively high hardness, and graphite is added to the material, making the sealing ring have higher wear resistance, making the sealing ring more durable and having a longer service life. The third sealing ring 13 is located between the first sealing ring 1 and the second sealing ring 2 to play a supporting role. The third sealing ring 13 is positioned through the positioning groove 112 on the first sealing ring 11 and the positioning groove 122 on the second sealing ring 12, so that the three are on a vertical straight line. The third sealing ring 13 has relatively high elasticity and is used to bear the axial deformation during the working process of the sealing ring. The length of the upper side of the chamfer structure 111 of the short side 113 of the first sealing ring 11 is the same as the length of the opening formed by the two L-shaped barb structures 123 on the second sealing ring 12, which facilitates the assembly of the first sealing ring 11 and the second sealing ring 12.

[0027] When the sealing ring body 1 bears pressure, it will first be applied to the second sealing ring 12. The second sealing ring 12 moves downward under pressure, but its shape will not deform. The deformation is mainly borne by the third sealing ring 13 with better elasticity. The second sealing ring 12 moves downward under pressure, and the L-shaped barb structure 123 below it will move on the support arm of the first sealing ring 11, so that the combined sealing ring will not undergo too much deformation, and the purpose of adjusting the wire diameter of the sealing ring can be achieved by replacing the third sealing ring 13 with different sizes.

[0028] As Figure 4 shown, the present invention also provides a sealing structure of a combined sealing ring, including the combined sealing ring described in the present invention, an upper seal 21 and a lower seal 22. There are also two buckles 23 on the groove of the lower seal 22. The combined sealing ring is placed in the groove on the lower seal 22, and the combined sealing ring is fixed by the two buckles 23. The width of the groove on the lower seal 22 is greater than the width of the combined sealing ring, which facilitates the installation of the combined sealing ring. The depth of the groove on the lower seal 22 is less than the wire diameter length of the combined sealing ring, so that a certain radial extrusion can be applied to the combined sealing ring during the installation process of the upper seal 21 and the lower seal 22, ensuring the reliability of the seal. The distance from the buckle 23 to the bottom of the groove on the lower seal 22 is equal to the thickness of the long side 114 of the first sealing ring, which ensures the stability of the combined sealing ring during the reciprocating motion.

Claims

1. A combined sealing ring, comprising a combined sealing ring body (1), characterized in that, The combined seal ring body (1) includes a first seal ring (11), a second seal ring (12), and a third seal ring (13). The short side (113) of the first seal ring (11) is placed inside the second seal ring (12). The third seal ring (13) is located inside the second seal ring (12) and separates the first seal ring (11) from the second seal ring (12). A metal skeleton (124) is embedded in the second seal ring (12). The cross-section of the second seal ring (12) is a square structure with one end open, and the two sides of the opening are L-shaped barb structures (123). A second positioning groove (122) is provided at the position corresponding to the opening. The cross-section of the first seal ring (11) is an "I" - shaped structure. The two sides of the short side (113) of the first seal ring (11) are chamfer structures (111), and their length is the same as the length of the L-shaped barb structure (123) on the second seal ring (12). A first positioning groove (112) is provided on the short side (113) of the first seal ring (11). The support wall (115) in the middle of the first seal ring (11) contacts the L-shaped barb structure of the second seal ring (12) to form a sealing structure. The first positioning groove (112), the second positioning groove (122), and the third seal ring (13) are in a vertical straight line.

2. The combined sealing ring according to claim 1, characterized in that, A sealing lip (121) integrated with the second seal ring (12) is provided above the outside of the second seal ring (12).

3. The combined sealing ring according to claim 2, wherein, An inner hole (116) is provided in the middle of the long side of the first seal ring (11).

4. The combined sealing ring according to claim 3, characterized in that, The third seal ring (13) is a detachable seal ring with different diameter sizes. The third seal ring (13) is an O - shaped seal ring, and its material is an elastic rubber material.

5. The combined sealing ring according to claim 4, wherein, The metal skeleton (124) is Hy - 80 steel with relatively high strength.

6. The combined sealing ring according to claim 4, wherein, The material of the sealing lip (121) is a rubber material with relatively high hardness added with graphite.

7. A sealing structure, characterized in that, It includes the combined seal ring according to any one of claims 1 - 6, an upper seal (21), and a lower seal (22). The combined seal ring is placed in the groove of the lower seal (22) and fixed by the buckle (23) on the groove wall of the lower seal (22) to seal the gap between the upper seal (21) and the lower seal (22).

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