Sealing structure

Abstract

Sealing structure comprising a fixed, regularly shaped sealing ring and a second sealing ring, characterized in that the second sealing ring has an outer surface and an inner surface, the inner surface having a fastening groove for the fixed, regularly shaped sealing ring, and the outer surface having an annular projection for forming a sealing fit with a sealing counter surface, In a free state, the solid, regularly shaped sealing ring protrudes from the mounting groove for the solid, regularly shaped sealing ring, the solid, regularly shaped sealing ring is softer than the second sealing ring, and spaces are provided between the two side walls of the mounting groove for the fixed, regularly shaped sealing ring and the fixed, regularly shaped sealing ring itself, so that the fixed, regularly shaped sealing ring can deform freely to both sides when it is compressed, and a groove is provided on the center line of the base of the mounting groove for the fixed, regularly shaped sealing ring.

Description

TECHNICAL AREA

[0001] The present invention relates to a sealing structure. BACKGROUND

[0002] Currently, sealing structures for oil cylinders typically rely on solutions that use only O-rings, such as single or double O-rings. With these types of sealing solutions, it is difficult to control the fit between the sealing contact surfaces to achieve better sealing performance. This often leads to excessive friction, which can cause the O-ring to pop out of its groove, resulting in a loss of seal. Alternatively, excessive heat generation can occur, reducing service life. Some designs use composite sealing rings to ensure sealing performance by preventing excessive friction. However, the internal fit of these composite sealing rings requires further improvement. SUMMARY

[0003] The object of the present invention is to provide a sealing structure that uses a composite sealing ring and can be used in various applications, such as oil cylinders. This structure ensures sealing performance while simultaneously controlling the friction between the sealing contact surfaces to prevent excessive friction. At the same time, the internal structure of the composite sealing ring has been improved to optimize the stability of the seal during reciprocating motion.

[0004] To achieve the aforementioned objectives, the present invention employs the following technical solution: A sealing structure comprising a fixed, regularly shaped sealing ring and a second sealing ring, wherein the second sealing ring has an outer surface and an inner surface, the inner surface having a fixing groove for the fixed, regularly shaped sealing ring, and the outer surface having an annular projection for forming a sealing fit with the sealing surface;In the free state, the solid, regularly shaped sealing ring protrudes from the mounting groove for the solid, regularly shaped sealing ring, wherein the solid, regularly shaped sealing ring is softer than the second sealing ring, and wherein furthermore, spaces are provided between both side walls of the mounting groove for the solid, regularly shaped sealing ring and the solid, regularly shaped sealing ring itself, whereby the solid, regularly shaped sealing ring can deform freely to both sides under pressure, and wherein furthermore, a groove is provided on the center line of the bottom of the mounting groove for the solid, regularly shaped sealing ring.

[0005] Based on the foregoing technical solution, the present invention can further employ the following additional technical solutions, either individually or in different combinations: The second sealing ring further has side surfaces which are arranged between the inner surface and the outer surface, the side surfaces being designed to form a non-slip fit with the fixing groove of the sealing structure.

[0006] The cross-sectional body of the second sealing ring is rectangular, the annular projection is arranged on its outer contour, and the fastening groove for the fixed regularly shaped sealing ring is arranged on its inner contour, with the two right-angled edges on both sides forming a non-slip fit with the fastening groove, which has a rectangular cross-section.

[0007] The sealing structure is arranged within an annular groove on the inside or outer circumference of a component.

[0008] The cross-sectional shape of the solid, regularly shaped sealing ring is O-shaped or elliptical.

[0009] The base of the fixing groove for the fixed, regularly shaped sealing ring has a concave arc shape or is flat, the concave arc shape being symmetrical with respect to the groove located on the center line of the base of the groove.

[0010] The groove located at the center line of the base of the groove has a cross-section which is V-shaped, concave arc-shaped or rectangular.

[0011] The solid, regularly shaped sealing ring forms a tight fit with the base of the mounting groove in the sealing structure.

[0012] The side surface of the second sealing ring is designed in such a way that it forms a sealing fit with the groove wall of the mounting groove in the sealing structure.

[0013] By implementing the technical solution of the present invention, the invention provides the following advantages: 1. The sealing structure of the present invention is highly versatile, can be used for both hydraulic and pneumatic systems, supports bidirectional sealing and is easy to install; 2. If excessive friction could occur, the deformation of the solid, regularly shaped sealing ring can absorb excess energy to ensure that the frictional force between the second sealing ring and the sealing surface meets the requirements, thus preventing the sealing ring from popping out of the mounting groove, which would result in seal failure, or generating excessive heat which would impair the service life; 3. The present invention provides deformation spaces on both sides of the solid, regularly shaped sealing ring, so that the deformation of the solid, regularly shaped sealing ring is fully ensured, and thus good sealing performance is achieved under both low-pressure and high-pressure conditions; 4. It can improve the positional stability between the second sealing ring and the fixed, regularly shaped sealing ring, as well as the sealing performance between these and the opposing surfaces, which ensures stable sealing performance during bidirectional reciprocating movements; 5. It is characterized by low friction, low starting resistance and smooth movement. BRIEF DESCRIPTION OF THE DRAWINGS Fig. Figure 1 is a schematic view of embodiment 1 of the present invention. Fig. Figure 2 is a schematic view of embodiment 2 of the present invention. Fig. Figure 3 is a sectional view showing embodiment 1 of the present invention in a free state during use. Fig. Figure 4 is a sectional view showing embodiment 1 of the present invention in a compressed state during use. Fig. Figure 5 is a sectional view showing embodiment 2 of the present invention in a free state during use. Fig. Figure 6 is a sectional view showing embodiment 2 of the present invention in a compressed state during use. Fig. Figure 7 is a schematic view of embodiment 3 of the present invention. Fig. Figure 8 is a schematic view of embodiment 4 of the present invention. Fig. Figure 9 is a schematic view of embodiment 5 of the present invention. Fig. Figure 10 is a schematic view of embodiment 6 of the present invention. Fig. Figure 11 is a sectional view of the constructive embodiment in which the present invention is used for a rotating oil cylinder. DETAILED DESCRIPTION

[0014] Embodiment 1: Shaft-mounted sealing structure with reference to the Fig. 1, Fig. 3, Fig. 4 and Fig. 11

[0015] A sealing structure provided in this embodiment comprises a fixed, regularly shaped sealing ring 1 and a second sealing ring 2; the second sealing ring 2 has an outer surface 21, an inner surface 22 and side surfaces 23 and 24, which are arranged between the inner surface 22 and the outer surface 21; the inner surface 22 has a fastening groove 221 for the fixed, regularly shaped sealing ring, and the outer surface 21 has an annular projection 211, which forms a sealing fit with a sealing counter surface.

[0016] In its free state, the rigid, regularly shaped sealing ring 1 protrudes from the mounting groove 221, and the rigid, regularly shaped sealing ring 1 is softer than the second sealing ring 2; during installation, the sealing structure is compressed primarily between the bore and the shaft by the deformation of the rigid, regularly shaped sealing ring 1, which allows control of the friction between the second sealing ring 2 and the sealing counter surface (in this embodiment, the sealing structure is attached to the shaft 100, and the sealing counter surface is the bore wall 200).

[0017] The second sealing ring 2 is larger than the solid, regularly shaped sealing ring 1, which improves its resistance to popping out of the mounting groove 101 of the sealing structure, and the solid, regularly shaped sealing ring 1 is positioned between the second sealing ring 2 and the bottom of the mounting groove of the sealing structure, preventing it from slipping or being displaced; the solid, regularly shaped sealing ring 1 forms a sealing fit with the bottom of the mounting groove of the sealing structure on the shaft.

[0018] Furthermore, spaces 222 are provided between both side walls of the fastening groove 221 and the fixed, regularly shaped sealing ring 1, which allow the fixed, regularly shaped sealing ring 1 to deform freely under pressure and preferably to both sides; wherein, furthermore, a groove 223 is provided on the center line of the bottom of the fastening groove 221, and the groove 223 has a V-shaped cross-section.

[0019] The groove 223 serves as a positioning structure for the solid, regularly shaped sealing ring 1 by improving its positional stability in the free state, in the compressed state and during bidirectional movement, thereby optimizing the sealing performance while also preventing a concentration of stress on the second sealing ring 2 under excessive pressure, which could otherwise impair its service life.

[0020] The base of the fixing groove 221 for the fixed, regularly shaped sealing ring has a concave arc shape, and the concave arc shape is symmetrical with respect to the groove 223.

[0021] The side surfaces 23 and 24 are configured to form a non-slip fit with the mounting groove of the sealing structure; the cross-sectional body of the second sealing ring can, for example, be rectangular. If the cross-sectional body of the second sealing ring is rectangular, its inner contour has the mounting groove 221 for the fixed, regularly shaped sealing ring, and the two rectangular sides form a non-slip fit with the mounting groove of the sealing structure. The mounting groove of the sealing structure preferably has a rectangular cross-sectional shape.

[0022] Furthermore, the side surfaces 23 and 24 of the second sealing ring 2 are arranged such that they form a sealing fit with the groove wall of the mounting groove of the sealing structure.

[0023] The cross-sectional shape of the solid, regularly shaped sealing ring 1 is O-shaped, and the material of the solid, regularly shaped sealing ring 1 can be selected from the group comprising NBR (nitrile rubber) and FKM (fluorocarbon rubber); the material of the second sealing ring 2 can be selected from the group comprising PTFE (polytetrafluoroethylene) and UPE (ultra-high molecular weight polyethylene).

[0024] The fastening groove of the sealing structure preferably has a rectangular cross-sectional shape. The second sealing ring 2 is preferably designed such that its cross-sectional body is rectangular, with the annular projection 211 arranged on its outer contour and the fastening groove 221 for the fixed, regularly shaped sealing ring arranged on its inner contour, the two perpendicular sides of which form a non-slip fit with the fastening groove, which has a rectangular cross-section.

[0025] Embodiment 2: Bore-mounted sealing structure with reference to the Fig. 2, Fig. 5 and Fig. 6

[0026] The structure of this embodiment is similar to that of embodiment 1, except that it is a sealing structure which is attached to the wall of the bore, with the shaft surface being the sealing mating surface. Fig. 2 are the same elements labelled with the same reference numbers as in Fig. 1.

[0027] Embodiment 3: Shaft-mounted sealing structure with reference to Fig. 7

[0028] In this embodiment, the groove 223 has the shape of a circular arc; the other structural features correspond to embodiment 1.

[0029] Embodiment 4: Bore-mounted sealing structure with reference to Fig. 8

[0030] In this embodiment, the groove 223 has the shape of a circular arc; the other structural features correspond to embodiment 2.

[0031] Embodiment 5: Shaft-mounted sealing structure with reference to Fig. 9

[0032] In this embodiment, the groove 223 has a rectangular shape; the other structural features correspond to embodiment 1.

[0033] Embodiment 6: Bore-mounted sealing structure with reference to Fig. 10

[0034] In this embodiment, the groove 223 has a rectangular shape; the other structural features correspond to embodiment 2.

[0035] As in Fig. As shown in Figure 11, the sealing structure of the present invention is used as the sealing structure of a rotating oil cylinder, with the following installation positions being possible: (1) Between the outer wall of the front piston end 101 and the inner wall of the front end 102 of the cylinder body, in Fig. 11 designated as position A, which is a bore-mounted sealing structure; (2) Between the outer wall of the piston disc body 103 and the inner wall of the rear end 104 of the cylinder body, in Fig. 11 designated as position B, which is a shaft-mounted sealing structure; (3) Between the outer wall of the rear piston end 105 and the inner wall of the rear section 106 of the cylinder head, in Fig. 11 designated as position C, which is a bore-mounted sealing structure;

[0036] The foregoing description relates only to specific embodiments of the present invention and is not to be construed as a limitation of the structural features of the invention; the scope of protection of the invention includes all modifications or alterations made by trained professionals in accordance with the present invention.

[0037] It should be noted that the terms "have" and "comprise," and all variations thereof, in the description, claims, and accompanying drawings of the present invention serve solely to convey non-exclusive inclusion. The terms "install / mount," "provide," "be provided with," "connect," "be connected," and "positively interlocking" are to be interpreted as broadly as possible. These may refer, for example, to fixed connections, detachable connections, or one-piece structures; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through intervening media; or they may refer to internal communication between two devices, components, or elements. In the respective context, those skilled in the art will understand the specific meaning of the above terms in the present invention.

[0038] It is understood that in the description of the present invention, terms such as "one end," "the other end," "outer side," "inner side," "horizontal," "end section," "length," "outer end," "left," and "right" refer to orientations or positional relationships based on the accompanying drawings and are used solely for the purpose of simplifying the description of the present invention and for better understanding of it. These terms in no way indicate or suggest that the devices or components in question have a specific orientation or must be designed and operated in a particular orientation. Therefore, such expressions are not to be interpreted as limitations of the present invention. The use of terms such as "first" and "second" serves solely for the sake of simplicity and does not indicate any order or relative importance.

[0039] The present invention provides a sealing structure comprising a fixed, regularly shaped sealing ring and a second sealing ring. The inner surface of the second sealing ring has a mounting groove for the fixed, regularly shaped sealing ring, and the outer surface has an annular projection for forming a sealing fit with a mating sealing surface. The fixed, regularly shaped sealing ring is softer than the second sealing ring, and gaps are provided between the two side walls of the mounting groove and the fixed, regularly shaped sealing ring, allowing the fixed, regularly shaped sealing ring to deform freely in both directions when subjected to pressure. Furthermore, a groove is provided along the centerline of the base of the mounting groove.The sealing structure of the present invention can be used in various applications, such as oil cylinders, and is able to ensure sealing performance by controlling the friction between sealing surfaces and thereby preventing excessive friction. Furthermore, it improves the internal structure of the composite sealing ring and optimizes the stability of the seal during reciprocating motion.

Claims

[1] Sealing structure comprising a fixed, regularly shaped sealing ring and a second sealing ring, characterized by , that the second sealing ring has an outer surface and an inner surface, the inner surface has a fixing groove for the fixed, regularly shaped sealing ring, and the outer surface has an annular projection to form a sealing fit with a sealing counter surface, In a free state, the solid, regularly shaped sealing ring protrudes from the mounting groove for the solid, regularly shaped sealing ring, the solid, regularly shaped sealing ring is softer than the second sealing ring, and spaces are provided between the two side walls of the mounting groove for the fixed, regularly shaped sealing ring and the fixed, regularly shaped sealing ring itself, so that the fixed, regularly shaped sealing ring can deform freely to both sides when it is compressed, and a groove is provided on the center line of the base of the mounting groove for the fixed, regularly shaped sealing ring. [2] Sealing structure according to claim 1, characterized by , that the second sealing ring further comprises side surfaces which are arranged between the inner surface and the outer surface, wherein the side surfaces are arranged in such a way that they form a non-slip fit with the fixing groove of the sealing structure. [3] Sealing structure according to claim 1, characterized by, that the cross-sectional body of the second sealing ring is rectangular, wherein the annular projection is arranged on its outer contour, the fixing groove for the fixed regularly shaped sealing ring is arranged on its inner contour, and the two right-angled sides of the same form a non-slip fit with the fixing groove, which has a rectangular cross-section. [4] Sealing structure according to claim 1, characterized by that the sealing structure is arranged within an annular groove on the inside or outer circumference of a component. [5] Sealing structure according to claim 1, characterized by that the cross-sectional shape of the solid, regularly shaped sealing ring is O-shaped or elliptical. [6] Sealing structure according to claim 1, characterized bythat the base of the fixing groove for the fixed, regularly shaped sealing ring has a concave arc shape or is flat, wherein the concave arc shape is symmetrical with respect to the groove which is arranged on the center line of the base of the groove. [7] Sealing structure according to claim 1, characterized by that the groove provided at the center line of the base of the groove has a cross-section in a V-shape, concave arc shape or rectangular shape. [8] Sealing structure according to any one of claims 1 to 7, characterized by that the solid, regularly shaped sealing ring forms a sealing fit with the base of the mounting groove of the sealing structure. [9] Sealing structure according to claim 2, characterized by , that the side surface of the second sealing ring is arranged in such a way that it forms a sealing fit with the groove wall of the mounting groove in the sealing structure.

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