Sealing structure

Abstract

The utility model provides a sealing structure which comprises a solid regular-shape sealing ring and a second sealing ring, the inner side surface of the second sealing ring is provided with a solid regular-shape sealing ring installation groove, and the outer side surface of the second sealing ring is provided with an annular protrusion which is in sealing fit with a sealing fit face. The solid regular-shaped sealing ring is softer than the second sealing ring, and yielding intervals are formed between the groove walls of the two sides of the solid regular-shaped sealing ring mounting groove and the solid regular-shaped sealing ring, so that the solid regular-shaped sealing ring can freely deform towards the two sides when being pressed, and the solid regular-shaped sealing ring can be prevented from deforming towards the two sides when being pressed. And a groove is formed in the center line of the bottom of the solid regular-shaped sealing ring mounting groove. The combined sealing ring can be applied to oil cylinders and other different occasions, sealing performance can be guaranteed, friction force between sealing matching faces can be controlled, overlarge friction force is prevented, meanwhile, the internal structure of the combined sealing ring is improved, and sealing stability is improved in the back-and-forth movement process.

Description

Technical Field

[0001] The utility model relates to a sealing structure. Background Art

[0002] Currently, oil cylinder sealing structures generally use O-rings or double O-rings, which are simply O-rings. This sealing solution is difficult to control in order to achieve better sealing performance, which can easily lead to excessive friction, causing the O-ring to fall out of the installation groove, resulting in seal failure or severe heat generation that affects service life. Combination seals are also used to achieve the desired sealing performance without generating excessive friction, but the internal coordination of these combination seals needs to be improved. Utility Model Content

[0003] The purpose of this utility model is to provide a sealing structure that uses a combined sealing ring and can be used in various applications such as oil cylinders. It can ensure sealing performance and control the friction between the sealing mating surfaces to prevent excessive friction. At the same time, it improves the internal structure of the combined sealing ring and improves the sealing stability during reciprocating motion. To this end, the utility model adopts the following technical solutions:

[0004] A sealing structure includes a solid regularly shaped sealing ring and a second sealing ring, characterized in that the second sealing ring is provided with an outer surface and an inner surface, the inner surface is provided with a solid regularly shaped sealing ring mounting groove, and the outer surface is provided with an annular protrusion to form a sealing fit with the sealing mating surface, in a free state, the solid regularly shaped sealing ring protrudes from the solid regularly shaped sealing ring mounting groove, the solid regularly shaped sealing ring is softer than the second sealing ring, and there is a clearance gap between the two side groove walls of the solid regularly shaped sealing ring mounting groove and the solid regularly shaped sealing ring, so that the solid regularly shaped sealing ring can deform freely to both sides when under pressure, and a groove is provided at the center line of the groove bottom of the solid regularly shaped sealing ring mounting groove.

[0005] On the basis of adopting the above technical solutions, the present invention may also adopt the following further technical solutions at the same time, or use these further technical solutions in combination:

[0006] The second sealing ring is further provided with a side surface between the inner surface and the outer surface, and the side surface can form an anti-slip fit with the mounting groove of the sealing structure.

[0007] The cross-section of the second sealing ring is rectangular, the outer contour of which is provided with the annular protrusion, and the inner contour of which is provided with the solid regular-shaped sealing ring installation groove, and the right-angled sides on both sides form an anti-slip fit with the installation groove with a rectangular cross section.

[0008] The sealing structure is arranged in an annular groove on the inner side or the outer periphery of the component.

[0009] The cross-section of the solid regular-shaped sealing ring is O-shaped or elliptical.

[0010] The bottom of the solid regular-shaped sealing ring installation groove is a concave arc or a flat bottom, and the concave arc is symmetrical with respect to the groove provided at the center line of the groove bottom.

[0011] The groove arranged at the center line of the groove bottom is a groove with a cross section in a V-shape, a concave arc shape, a rectangular shape or the like.

[0012] The solid regularly shaped sealing ring forms a sealing fit with the bottom of the sealing structure mounting groove.

[0013] The side surface of the second sealing ring can form a sealing fit with the groove wall of the installation groove of the sealing structure.

[0014] Due to the adoption of the technical solution of the utility model, the utility model has the following advantages:

[0015] 1. The sealing structure of the present invention has good versatility and can be used in both hydraulic and pneumatic equipment. It has bidirectional sealing and is easy to install. 2. When excessive friction may occur, the deformation of the solid regular-shaped sealing ring can absorb excess energy, ensuring that the friction between the second sealing ring and the sealing mating surface meets the requirements, avoiding it from falling out of the installation groove, causing seal failure, or severe heat generation and affecting the service life. 3. The present invention provides deformation space on both sides of the solid regular-shaped sealing ring, and the deformation of the solid regular-shaped sealing ring is fully guaranteed, and it has good sealing performance under low or high pressure. 4. It can improve the position stability between the second sealing ring and the solid regular-shaped sealing ring and the sealing performance between TM, ensuring the stability of the sealing performance during the back-and-forth movement of the two-day operation. 4. Low friction, small starting resistance, and smooth movement. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of Example 1 of the present utility model.

[0017] Figure 2 This is a schematic diagram of Example 2 of the present utility model.

[0018] Figure 3 This is a cross-sectional view of Example 1 of the utility model when in a free state during use.

[0019] Figure 4 This is a cross-sectional view of Example 1 of the utility model when in a compressed state during use.

[0020] Figure 5 This is a cross-sectional view of Example 2 of the utility model when in a free state during use.

[0021] Figure 6 This is a cross-sectional view of Example 2 of the utility model when in use and under pressure.

[0022] Figure 7 This is a schematic diagram of Example 3 of the present utility model.

[0023] Figure 8 This is a schematic diagram of Example 4 of the present utility model.

[0024] Figure 9 This is a schematic diagram of Example 5 of the present utility model.

[0025] Figure 10 This is a schematic diagram of Example 6 of the present utility model. DETAILED DESCRIPTION

[0026] Example 1, refer to the attached Figure 1 、 3 4. Shaft-mounted sealing structure

[0027] A sealing structure provided in this embodiment includes a solid regular shape sealing ring 1 and a second sealing ring 2. The second sealing ring 2 is provided with an outer surface 21, an inner surface 22, and side surfaces 23 and 24 between the inner surface 21 and the outer surface. The inner surface is provided with a solid regular shape sealing ring mounting groove 221, and the outer surface 21 is provided with an annular protrusion 211 to form a sealing fit with the sealing mating surface. In a free state, the solid regular shape sealing ring 1 protrudes from the solid regular shape sealing ring mounting groove 221. The solid regular shape sealing ring 1 is softer than the second sealing ring 2. During installation, the main To squeeze the sealing structure between the hole and the shaft through deformation of the solid, regularly shaped sealing ring 1 and control friction between the second sealing ring 2 and the sealing mating surface (in this embodiment, the sealing structure is mounted on the shaft 100, and the sealing mating surface is the hole wall 200), the second sealing ring 2 is larger than the solid, regularly shaped sealing ring 1, which improves its resistance to falling out of the sealing structure mounting groove 101. The solid, regularly shaped sealing ring 1 is hidden between the second sealing ring 2 and the bottom of the sealing structure mounting groove, preventing it from falling out. The solid, regularly shaped sealing ring 1 forms a sealing engagement with the bottom of the sealing structure mounting groove on the shaft. Furthermore, a clearance gap 222 is provided between the side walls of the solid, regularly shaped sealing ring mounting groove 221 and the solid, regularly shaped sealing ring 1, allowing the solid, regularly shaped sealing ring 1 to deform freely and preferentially to the sides when under pressure. Furthermore, a V-shaped groove 223 is provided at the centerline of the bottom of the solid, regularly shaped sealing ring mounting groove 221. The groove 223 can pre-position the solid regular-shaped sealing ring 1, improve its position stability in the free state, the pressurized state and the bidirectional movement, improve the sealing performance, and also avoid the stress concentration when the second sealing ring 2 is under excessive pressure, which may affect its service life.

[0028] The bottom of the solid regular-shaped sealing ring installation groove 221 is a concave arc shape, and the concave arc shape is symmetrical with respect to the groove 223 .

[0029] The side surfaces 23 and 24 can form an anti-slip fit with the mounting groove of the sealing structure. For example, if the cross-section of the second sealing ring is rectangular, the inner contour of the second sealing ring is provided with the solid, regularly shaped sealing ring mounting groove 221, with its two right-angled sides forming an anti-slip fit with the mounting groove of the sealing structure. The mounting groove of the sealing structure preferably has a rectangular cross-section.

[0030] Furthermore, the side surfaces 23 and 24 of the second sealing ring 2 can form a sealing fit with the groove wall of the mounting groove of the sealing structure.

[0031] The cross-section of the solid regular-shaped sealing ring 1 is O-shaped. The materials of the solid regular-shaped sealing ring 1 can be: NBR (nitrile rubber), FKM (fluororubber); the materials of the second sealing ring 2 can be: PTFE (polytetrafluoroethylene), UPE (ultra-high molecular weight polyethylene).

[0032] The mounting groove of the sealing structure is preferably a groove with a rectangular cross section. The second sealing ring 2 preferably has a rectangular cross section, with the annular protrusion 211 provided on its outer contour and the solid, regularly shaped sealing ring mounting groove 221 provided on its inner contour. The right-angled sides of the second sealing ring 221 form a stopper against slipping out of the rectangular cross section.

[0033] Example 2, refer to the attached Figure 2 、 5 6. Hole-mounted sealing structure

[0034] The structure of this embodiment is similar to that of embodiment 1, except that it is a sealing structure installed on the hole wall, and the sealing mating surface is the shaft surface. Figure 2 In the figure, the reference numerals and Figure 1 The same represents the same meaning.

[0035] Example 3, reference Figure 7 , shaft-mounted sealing structure.

[0036] In this embodiment, the groove 223 is in an arc shape, and other structures refer to the first embodiment.

[0037] Example 4, with reference to Figure 8 , hole-mounted sealing structure.

[0038] In this embodiment, the groove 223 is in an arc shape, and other structures refer to the second embodiment.

[0039] Example 5, with reference to Figure 9 , shaft-mounted sealing structure.

[0040] In this embodiment, the groove 223 is rectangular, and other structures refer to the first embodiment.

[0041] Example 6, reference Figure 10 , hole-mounted sealing structure.

[0042] In this embodiment, the groove 223 is rectangular, and other structures refer to the second embodiment.

[0043] The above description is only a specific embodiment of the present invention, but the structural features of the present invention are not limited thereto. Any changes or modifications made by any technician in this field within the field of the present invention are included in the protection scope of the present invention.

[0044] It should be noted that the terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "installed", "set", "provided with", "connected", "connected", and "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be internal communication between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0045] In the description of this utility model, it should be understood that terms such as "one end," "the other end," "outer side," "inner side," "horizontal," "end," "length," "outer end," "left," and "right" are used to indicate positions or locations based on the positions or locations shown in the accompanying drawings. These terms are used solely to facilitate the description of this utility model and to simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. The terms "first" and "second" are used solely for brevity of description and do not indicate or imply relative importance.

Claims

1. A sealing structure comprising a solid regular-shaped sealing ring and a second sealing ring, characterized in that: The second sealing ring is provided with an outer surface and an inner surface, the inner surface is provided with a solid regular shape sealing ring mounting groove, and the outer surface is provided with an annular protrusion to form a sealing fit with the sealing mating surface. In a free state, the solid regular shape sealing ring protrudes from the solid regular shape sealing ring mounting groove. The solid regular shape sealing ring is softer than the second sealing ring, and there is a clearance between the groove walls on both sides of the solid regular shape sealing ring mounting groove and the solid regular shape sealing ring, so that the solid regular shape sealing ring can deform freely to both sides when under pressure, and a groove is provided at the center line of the groove bottom of the solid regular shape sealing ring mounting groove.

2. A sealing structure according to claim 1, characterized in that The second sealing ring is further provided with a side surface between the inner surface and the outer surface, and the side surface can form an anti-slip fit with the mounting groove of the sealing structure.

3. A sealing structure according to claim 1, characterized in that The cross-section of the second sealing ring is rectangular, the outer contour of which is provided with the annular protrusion, and the inner contour of which is provided with the solid regular-shaped sealing ring installation groove, and the right-angled sides on both sides form an anti-slip fit with the installation groove with a rectangular cross section.

4. A sealing structure according to claim 1, characterized in that The sealing structure is arranged in an annular groove on the inner side or the outer periphery of the component.

5. A sealing structure according to claim 1, characterized in that The cross-section of the solid regular-shaped sealing ring is O-shaped or elliptical.

6. A sealing structure according to claim 1, characterized in that The bottom of the solid regular-shaped sealing ring installation groove is a concave arc or a flat bottom, and the concave arc is symmetrical with respect to the groove provided at the center line of the groove bottom.

7. A sealing structure according to claim 1, characterized in that The groove arranged at the center line of the groove bottom is a groove with a V-shaped, concave arc-shaped or rectangular cross section.

8. A sealing structure according to claim 1, 2, 3, 4, 5, 6 or 7, characterized in that The solid regularly shaped sealing ring forms a sealing fit with the bottom of the sealing structure mounting groove.

9. A sealing structure according to claim 2, characterized in that The side surface of the second sealing ring can form a sealing fit with the groove wall of the installation groove of the sealing structure.

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