A double-layer composite gasket

Abstract

The utility model relates to the technical field of sealing gasket, especially to a double-layer composite sealing gasket, which comprises a metal ring, an annular cavity is arranged on the inner side of the metal ring, a rubber ring is fixed in the annular cavity of the metal ring, an annular deep groove and an annular shallow groove are arranged on the inner circumferential surface of the rubber ring, the annular deep groove and the annular shallow groove are connected through at least one sawtooth groove, the depth of the groove bottom of the sawtooth groove gradually decreases from the annular deep groove to the annular shallow groove, compared with the prior art, the composite structure of the metal ring and the rubber ring, combined with the unique annular deep groove, annular shallow groove and sawtooth groove on the inner circumferential surface of the rubber ring, can effectively improve the sealing performance of the sealing gasket, the annular deep groove and the annular shallow groove can form multiple sealing lines during the sealing process, and the blocking ability of the fluid is enhanced, the uniform distribution of pressure is facilitated by the through design of the sawtooth groove, stress concentration is reduced, and the pressure resistance and wear resistance of the sealing gasket are improved.

Description

Technical Field

[0001] This utility model relates to the field of sealing gasket technology, and in particular to a double-layer composite sealing gasket. Background Technology

[0002] In many fields such as machinery, chemical industry, and energy, gaskets are important components for preventing fluid leakage, and their sealing performance directly affects the safe and stable operation and working efficiency of equipment.

[0003] Traditional gaskets have certain limitations in terms of sealing effect, pressure resistance, and wear resistance. For example, gaskets made of a single material cannot simultaneously meet the requirements of high strength and good elasticity. After being subjected to greater pressure or used for a long time, they are prone to sealing failure and deformation, which can lead to fluid leakage, equipment failure, or even safety accidents. Therefore, there is an urgent need for a new type of gasket to improve sealing performance and reliability. Utility Model Content

[0004] To address the technical problems existing in the background art, this utility model proposes a double-layer composite sealing gasket.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A double-layer composite sealing gasket, characterized in that it comprises:

[0007] A metal ring, wherein the inner side of the metal ring is provided with an annular cavity;

[0008] A rubber ring is fixed within the annular cavity of the metal ring;

[0009] The inner circumferential surface of the rubber ring is provided with an annular deep groove and an annular shallow groove.

[0010] The annular deep groove and the annular shallow groove are connected by at least one serrated groove, and the bottom depth of the serrated groove gradually decreases from the annular deep groove to the annular shallow groove.

[0011] Preferably, the annular deep groove is located on the middle plane in the thickness direction of the rubber ring, the annular shallow groove is located in the upper region in the thickness direction of the rubber ring, and the groove width of the annular deep groove is greater than the groove width of the annular shallow groove.

[0012] Preferably, the number of the serrated grooves is at least three, and they are evenly distributed in an array along the circumference of the rubber ring.

[0013] Preferably, the cross-sectional shape of the sawtooth groove is one of V-shape, U-shape or trapezoid.

[0014] Preferably, the metal ring and the rubber ring are fixed together by vulcanization bonding.

[0015] Preferably, the radial cross-sectional thickness of the rubber ring has a non-linear, gradually varying structure with a thinner outer edge and a thicker inner edge, wherein the outer edge thickness T0 is less than the inner edge thickness T. i The thickness change from the outer edge to the inner edge forms a continuous and smooth convex surface, and the thickness change in the outer edge region is steeper than that in the inner edge region.

[0016] Preferably, at the contact interface between the rubber ring and the inner sidewall of the metal ring cavity, the angle θ between the tangent of the curved transition and the sidewall of the cavity satisfies: 15°≤θ≤35°.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] Compared with existing technologies, the composite structure of metal and rubber rings, combined with the unique annular deep groove, annular shallow groove, and serrated groove design on the inner circumference of the rubber ring, effectively improves the sealing performance of the gasket. The annular deep and shallow grooves form multiple sealing defenses during the sealing process, enhancing the ability to block fluids. The through-type serrated groove design helps to distribute pressure evenly, reduce stress concentration, and improve the pressure resistance and wear resistance of the gasket. The vulcanization bonding method of the metal and rubber rings ensures the stability of the composite structure. The non-linear gradient thickness structure of the rubber ring and the specific contact interface angle design further optimize the mechanical properties and sealing effect of the gasket, extend its service life, and effectively solve the problems existing in existing gaskets. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the double-layer composite sealing gasket proposed in this utility model;

[0020] Figure 2 This is a cross-sectional view of the double-layer composite sealing gasket proposed in this utility model;

[0021] Figure 3 This utility model Figure 2 Enlarged structural diagram at point A;

[0022] Figure 4 This is a schematic diagram of the serrated groove in the double-layer composite sealing gasket proposed in this utility model.

[0023] In the diagram: 1-metal ring, 11-cavity, 2-rubber ring, 21-annular deep groove, 22-annular shallow groove, 23-serrated groove. Detailed Implementation

[0024] 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.

[0025] like Figures 1-4 As shown, this embodiment provides a double-layer composite sealing gasket, comprising:

[0026] Metal ring 1, the inner side of which is provided with an annular cavity 11;

[0027] The rubber ring 2 is fixed within the annular cavity 11 of the metal ring 1;

[0028] The inner circumferential surface of the rubber ring 2 is provided with an annular deep groove 21 and an annular shallow groove 22;

[0029] The annular deep groove 21 and the annular shallow groove 22 are connected by at least one serrated groove 23, and the depth of the bottom of the serrated groove 23 gradually decreases from the annular deep groove 21 to the annular shallow groove 22.

[0030] Overall, the inner side of the metal ring 1 is provided with an annular cavity 11, and the rubber ring 2 is fixed in the annular cavity 11 of the metal ring 1. The inner circumferential surface of the rubber ring 2 is provided with an annular deep groove 21 and an annular shallow groove 22. The annular deep groove 21 and the annular shallow groove 22 are connected by at least one serrated groove 23. The bottom depth of the serrated groove 23 gradually decreases from the annular deep groove 21 to the annular shallow groove 22.

[0031] In practical use, this structural design allows the annular deep groove 21 and annular shallow groove 22 to form a good sealing space when the gasket is under pressure, and the multiple sealing lines effectively prevent fluid leakage; the serrated groove 23 promotes the uniform transmission of pressure, reduces stress concentration, and significantly improves the sealing performance and service life of the gasket.

[0032] like Figures 2-3 As shown, in this embodiment, the annular deep groove 21 is located on the middle plane in the thickness direction of the rubber ring 2, and the annular shallow groove 22 is located in the upper region in the thickness direction of the rubber ring 2. The groove width of the annular deep groove 21 is greater than the groove width of the annular shallow groove 22.

[0033] Specifically, the annular deep groove 21 is located on the middle plane in the thickness direction of the rubber ring 2, and the annular shallow groove 22 is located in the upper region in the thickness direction of the rubber ring 2. The groove width of the annular deep groove 21 is greater than the groove width of the annular shallow groove 22. The annular deep groove 21 forms the main sealing cavity and is used to absorb most of the impact pressure generated by the medium. The setting of the annular shallow groove 22 enables the rubber ring 2 to deform preferentially under the action of flange clamping force, so as to achieve end face micro-gap sealing. Through the axial staggered arrangement of the annular deep groove 21 and the annular shallow groove 22, the pressure superposition can be avoided, thereby improving the pressure bearing capacity of the gasket.

[0034] like Figures 1-3 As shown, in this embodiment, the number of the sawtooth grooves 23 is at least 3, and they are evenly distributed in an array along the circumference of the rubber ring 2.

[0035] Specifically, the annular deep groove 21 and the annular shallow groove 22 are connected by three serrated grooves 23. The serrated grooves 23 are evenly distributed in an array along the circumference of the rubber ring 2, which can make the compressive stress distribution uniform and reduce local creep.

[0036] like Figures 3-4 As shown, in this embodiment, the cross-sectional shape of the sawtooth groove 23 is one of V-shape, U-shape or trapezoid.

[0037] Specifically, the cross-sectional shape of the sawtooth groove 23 is one of V-shape, U-shape or trapezoid, wherein:

[0038] The V-shaped serrated groove 23 has a sharp bottom. When the gasket is under pressure, this sharp structure can better embed into the sealing surface, fill the tiny depressions and gaps on the sealing surface, form a tight sealing contact, effectively prevent fluid leakage, and significantly improve sealing performance. In addition, the shape of the V-groove allows the pressure to be concentrated at the tip of the groove when transmitting pressure, which helps to distribute the pressure more evenly to various parts of the gasket, reduce stress concentration, improve the pressure resistance and fatigue resistance of the gasket, and extend its service life. Furthermore, the structure of the V-groove is relatively simple, and the mold design and processing difficulty is lower during the manufacturing process, which helps to reduce production costs and improve production efficiency.

[0039] The U-shaped serrated groove 23 ensures pressure transmission while providing better impurity containment and buffering capabilities. This reduces wear on the sealing surface caused by impurities, further improving the wear resistance of the gasket. In some complex sealing environments where impurities are easily generated, gaskets with U-shaped serrated grooves 23 can better adapt to the working environment, maintain good sealing performance, extend the gasket replacement cycle, and reduce equipment maintenance costs.

[0040] The trapezoidal serrated groove 23 combines some advantages of V-shaped and U-shaped grooves. Its inclined groove walls can concentrate pressure to a certain extent, effectively transmitting and dispersing pressure. At the same time, the bottom of the trapezoidal groove has a certain space to accommodate a small amount of impurities, providing a certain degree of impurity resistance. In terms of mechanical properties, the structure of the trapezoidal groove allows the rubber ring 2 to produce stable elastic deformation under pressure, maintaining a good sealing state. Compared with V-shaped grooves, the bottom of the trapezoidal groove is wider, providing better support when subjected to greater pressure and reducing the risk of the rubber ring 2 rupturing due to excessive pressure. Compared with U-shaped grooves, the inclined groove walls of the trapezoidal groove perform better in terms of pressure transmission and concentration, which helps to improve the overall sealing performance and pressure resistance of the sealing gasket. This type of serrated groove 23 is suitable for working environments with high requirements for both sealing performance and mechanical performance.

[0041] like Figures 2-3 As shown, in this embodiment, the metal ring 1 and the rubber ring 2 are fixed together by vulcanization bonding.

[0042] Specifically, the rubber ring 2 is fixed to the annular cavity 11 of the metal ring 1 by vulcanization bonding, which can ensure that the metal ring 1 and the rubber ring 2 will not easily fall off or separate during long-term use, thereby ensuring the reliability and safety of the sealing system.

[0043] like Figures 2-3 As shown, in this embodiment, the radial cross-sectional thickness of the rubber ring 2 has a non-linear gradient structure with a thinner outer edge and a thicker inner edge, wherein the outer edge thickness T0 is less than the inner edge thickness T. i The thickness change from the outer edge to the inner edge forms a continuous and smooth convex surface, and the thickness change in the outer edge region is steeper than that in the inner edge region.

[0044] Specifically, the radial cross-sectional thickness of rubber ring 2 exhibits a non-linear, gradually varying structure with a thinner outer edge and a thicker inner edge; the outer edge thickness T0 is less than the inner edge thickness T. i The thickness change from the outer edge to the inner edge forms a continuous and smooth convex curved surface, and the thickness change steepness of the outer edge region is greater than that of the inner edge region. At the contact interface between the rubber ring 2 and the inner wall of the cavity 11 of the metal ring 1, the thin outer structure of the rubber ring 2 section can reduce edge stress concentration; the thick inner structure can enhance the resistance to internal pressure, improve the bonding strength between rubber and metal during the vulcanization process, and avoid interface peeling under thermal cycling.

[0045] like Figures 2-3 As shown, in this embodiment, at the contact interface between the rubber ring 2 and the inner sidewall of the cavity 11 of the metal ring 1, the angle θ between the tangent of the curved transition and the sidewall of the cavity 11 satisfies: 15°≤θ≤35°.

[0046] Preferably, the number of sawtooth grooves 23 is increased to four, and the angle θ between the tangent of the curved transition at the contact interface between the rubber ring 2 and the inner wall of the cavity 11 of the metal ring 1 and the side wall of the cavity 11 is 30°. Increasing the number of sawtooth grooves 23 can further improve the uniformity of pressure distribution and make the sealing performance of the gasket more consistent in all directions. The 30° contact interface angle optimizes the fit between the rubber ring 2 and the metal ring 1, ensuring a tight fit while enhancing the stability of the gasket under high pressure. The gasket of this embodiment is suitable for high-pressure working environments with high requirements for sealing performance and stability, and can reliably ensure the sealing requirements of the equipment and reduce the risk of fluid leakage.

[0047] Of course, those skilled in the art will recognize that this invention is not limited to the details of the exemplary embodiments described above, but also includes the same or similar structures that can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0048] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0049] The technologies, shapes, and structures not described in detail in this utility model are all known technologies.

Claims

1. A double-layer composite sealing gasket, characterized in that, include: A metal ring (1) is provided with an annular cavity (11) on its inner side; A rubber ring (2) is fixed in the annular cavity (11) of the metal ring (1); The inner circumferential surface of the rubber ring (2) is provided with an annular deep groove (21) and an annular shallow groove (22); The annular deep groove (21) and the annular shallow groove (22) are connected by at least one sawtooth groove (23), and the bottom depth of the sawtooth groove (23) gradually decreases from the annular deep groove (21) to the annular shallow groove (22).

2. The double-layer composite sealing gasket according to claim 1, characterized in that, The annular deep groove (21) is located on the middle plane in the thickness direction of the rubber ring (2), and the annular shallow groove (22) is located in the upper region in the thickness direction of the rubber ring (2). The groove width of the annular deep groove (21) is greater than the groove width of the annular shallow groove (22).

3. The double-layer composite sealing gasket according to claim 1, characterized in that, The number of the sawtooth grooves (23) is at least three, and they are evenly distributed in an array along the circumference of the rubber ring (2).

4. The double-layer composite sealing gasket according to any one of claims 1 to 3, characterized in that, The cross-sectional shape of the sawtooth groove (23) is one of V-shape, U-shape or trapezoid.

5. The double-layer composite sealing gasket according to claim 1, characterized in that, The metal ring (1) and the rubber ring (2) are bonded together by vulcanization.

6. The double-layer composite sealing gasket according to claim 1, characterized in that, The radial cross-sectional thickness of the rubber ring (2) has a non-linear gradient structure with a thinner outer edge and a thicker inner edge, wherein the outer edge thickness T0 is less than the inner edge thickness T. i The thickness change from the outer edge to the inner edge forms a continuous and smooth convex surface, and the thickness change in the outer edge region is steeper than that in the inner edge region.

7. The double-layer composite sealing gasket according to claim 6, characterized in that, At the contact interface between the rubber ring (2) and the inner sidewall of the cavity (11) of the metal ring (1), the angle θ between the tangent of the curved transition and the sidewall of the cavity (11) satisfies: 15°≤θ≤35°.

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