Leak-proof stainless steel double-clamp press pipe fitting

Abstract

The utility model belongs to the technical field of conveying pipeline, concretely is a kind of anti-leakage stainless steel double clamping and pressing type pipe fitting, including pipe fitting body, the socket of pipe fitting body is equipped with U-shaped groove, sealing ring is arranged in U-shaped groove, the sealing ring is hollow annular structure, its inside is embedded with elastic skeleton, the elastic skeleton includes elastic structure and the arc-shaped support plate of setting in the upper and lower sides of this elastic structure;The sealing ring includes outer layer and inner layer, the outer layer is made of first rubber material, the inner layer is made of second rubber material;The side surface of the elastic structure and the inner wall of the sealing ring between are provided with the filling body by the second rubber material composition.This utility model provides strong, even radial resilience by built-in elastic skeleton, its arc-shaped support plate effectively prevents skeleton from being excessively crushed, ensures the long-term stability of sealing pressure after clamping and pressing, fundamentally overcomes the leakage problem caused by stress relaxation.

Description

Technical Field

[0001] This utility model relates to the field of pipeline technology, specifically to a leak-proof stainless steel double-clamping pipe fitting. Background Technology

[0002] Press-fit connections are one of the mainstream connection methods for stainless steel piping systems. They rely on a press-fit tool to compress and deform the socket of the pipe fitting, squeezing out the internal O-ring to achieve a seal. However, traditional solid O-rings have inherent drawbacks: firstly, after press-fit deformation, the internal stress distribution is uneven, and the resilience is limited, leading to a decrease in sealing pressure due to stress relaxation during long-term service; secondly, solid O-rings lack the ability to adapt to deformation under water hammer, vibration, and thermal cycling in piping systems, easily causing momentary or permanent leaks. Furthermore, it is difficult for a single-material O-ring to achieve the optimal balance between the interdependent properties of hardness, elasticity, wear resistance, and aging resistance. Therefore, developing a sealing structure that provides continuous, stable, adaptive sealing force and a long service life is crucial for improving the reliability of press-fit pipe connections. Utility Model Content

[0003] This utility model aims to solve one of the technical problems existing in the prior art or related technologies.

[0004] Therefore, the technical solution adopted by this utility model is as follows:

[0005] A leak-proof stainless steel double-press fitting includes a fitting body. A U-shaped groove is provided within the socket of the fitting body, and a sealing ring is disposed within the U-shaped groove. The sealing ring has a hollow annular structure with an embedded elastic skeleton. The elastic skeleton includes an elastic structure and arc-shaped support plates disposed on the upper and lower sides of the elastic structure. The sealing ring includes an outer layer and an inner layer. The outer layer is made of a first rubber material, and the inner layer is made of a second rubber material. A filler made of the second rubber material is disposed between the side of the elastic structure and the inner wall of the sealing ring.

[0006] In a preferred embodiment, the present invention can be further configured such that the elastic structure is an intermittently arranged rhomboid ring structure.

[0007] In a preferred embodiment, the present invention can be further configured such that the hardness of the first rubber material is greater than the hardness of the second rubber material.

[0008] In a preferred embodiment, the present invention can be further configured such that: the first rubber material is hydrogenated nitrile rubber, and the second rubber material is ethylene propylene diene monomer (EPDM) rubber or silicone rubber.

[0009] In a preferred embodiment, the present invention can be further configured such that a limiting protrusion is provided on the inner wall of the U-shaped groove.

[0010] In a preferred embodiment, the present invention can be further configured such that the arc-shaped support plate is a thin metal plate or a high-strength engineering plastic plate.

[0011] In a preferred embodiment, the present invention can be further configured such that sealing limiting strips are provided on both sides of the sealing ring.

[0012] The above-mentioned technical solution of this utility model has the following beneficial technical effects:

[0013] 1. This utility model provides a strong and uniform radial rebound force through the built-in elastic skeleton, and its arc-shaped support plate effectively prevents the skeleton from being over-crushed, ensuring the long-term stability of the sealing pressure after clamping, and fundamentally overcoming the leakage problem caused by stress relaxation.

[0014] 2. This utility model adopts a composite rubber structure of "hard outside and soft inside". The inner layer and filler preferentially deform to absorb energy, so that the sealing ring can adapt well to pipeline vibration and dimensional tolerance. The outer layer provides a hard and wear-resistant sealing interface, which achieves a perfect combination of elasticity and hardness and significantly improves the sealing reliability. Attached Figure Description

[0015] Figure 1 This is a cross-sectional view of the leak-proof stainless steel double-clamp pipe fitting of this utility model.

[0016] Figure 2 This is an enlarged view of section A of the leak-proof stainless steel double-clamp pipe fitting of this utility model.

[0017] Figure label:

[0018] 1. Pipe body; 2. U-shaped groove; 3. Sealing ring; 31. Outer layer; 32. Inner layer; 33. Filler; 34. Limiting protrusion; 35. Sealing limiting strip; 4. Elastic skeleton; 41. Elastic structure; 42. Arc-shaped support plate. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features of the present utility model can be combined with each other.

[0020] It should be understood that these descriptions are merely exemplary and are not intended to limit the scope of this invention.

[0021] The following describes, with reference to the accompanying drawings, some embodiments of the present invention, providing a leak-proof stainless steel double-clamp pipe fitting.

[0022] Combination Figures 1-2 As shown, this utility model provides a leak-proof stainless steel double-press fitting, including a fitting body 1. The fitting body 1 has a U-shaped groove 2 inside its socket, and a sealing ring 3 is installed inside the U-shaped groove 2. The sealing ring 3 is a hollow annular structure with an embedded elastic skeleton 4. The elastic skeleton 4 includes an elastic structure 41 and arc-shaped support plates 42 disposed on the upper and lower sides of the elastic structure 41. The sealing ring 3 includes an outer layer 31 and an inner layer 32. The outer layer 31 is made of a first rubber material, and the inner layer 32 is made of a second rubber material. A filler 33 made of the second rubber material is disposed between the side of the elastic structure 41 and the inner wall of the sealing ring 3. This solution provides a strong and uniform radial rebound force through the built-in elastic structure 41, and its arc-shaped support plates 42 effectively prevent the elastic structure 41 from being excessively crushed, ensuring the long-term stability of the sealing pressure after pressing, and fundamentally overcoming the leakage problem caused by stress relaxation.

[0023] Furthermore, the elastic structure 41 is an intermittently arranged rhomboid ring structure. The rhomboid structure has a good elastic support effect. The intermittent arrangement is disconnected, but adjacent parts are in contact, thereby preventing the elastic structure 41 from being isolated after being compressed and avoiding deformation caused by internal stress conflicts.

[0024] Specifically, the hardness of the first rubber material is greater than that of the second rubber material. By adopting a composite rubber structure of "hard outside and soft inside", the first rubber material is hydrogenated nitrile rubber, and the second rubber material is EPDM rubber or silicone rubber. The inner layer 32 and the filler 33 preferentially deform to absorb energy, so that the sealing ring 3 can adapt well to pipeline vibration and dimensional tolerances. The outer layer 31 provides a hard and wear-resistant sealing interface, achieving a perfect combination of elasticity and hardness, and significantly improving the sealing reliability.

[0025] Furthermore, the inner wall of the U-shaped groove 2 is provided with a limiting protrusion 34, which effectively prevents the sealing ring 3 from rolling and shifting during the pressing process, ensuring the uniformity and consistency of the sealing strip formation, and further eliminating the risk of leakage caused by improper installation.

[0026] Furthermore, the arc-shaped support plate 42 is a thin metal plate or a high-strength engineering plastic plate, both of which have good support effects.

[0027] Furthermore, sealing limit strips 35 are provided on both sides of the sealing ring 3, which can ensure the stability of the sealing ring 3 placed in the U-shaped groove 2, and at the same time play an auxiliary sealing role when the sealing ring 3 is compressed to achieve sealing, thereby further improving the sealing effect.

[0028] The terms "fixed," "installed," "connected," "set up," "open," "equipped with," "embedded," and "assembled" used in this manual to describe the position or relationship of components all refer to conventional physical connections or spatial configurations that can be understood and implemented by those skilled in the art based on the function of the relevant components, the context, and common knowledge. These relationships encompass, but are not limited to, specific forms such as welding, bonding, threaded fastening, snap-fit, interference fit, plug-in, sliding fit, hinge, integral molding, adjacent arrangement, and opening or slot accommodating. Their purpose is to clearly describe the relative positions, mating methods, and functional implementation paths between components, rather than limiting a single specific structural detail. To ensure a smooth and concise reading experience and ease of understanding, no separate explanation is provided after each term.

[0029] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A leak-proof stainless steel double-clamp pipe fitting, comprising a pipe fitting body (1), wherein a U-shaped groove (2) is provided in the socket of the pipe fitting body (1), and a sealing ring (3) is provided in the U-shaped groove (2), characterized in that: The sealing ring (3) is a hollow ring structure with an elastic skeleton (4) embedded inside. The elastic skeleton (4) includes an elastic structure (41) and arc-shaped support plates (42) disposed on the upper and lower sides of the elastic structure (41). The sealing ring (3) includes an outer layer (31) and an inner layer (32), wherein the outer layer (31) is made of a first rubber material and the inner layer (32) is made of a second rubber material; A filler (33) made of the second rubber material is provided between the side of the elastic structure (41) and the inner wall of the sealing ring (3).

2. The leak-proof stainless steel double-press fitting according to claim 1, characterized in that, The elastic structure (41) is a discontinuously arranged rhomboid ring structure.

3. The leak-proof stainless steel double-clamp pipe fitting according to claim 1, characterized in that, The hardness of the first rubber material is greater than that of the second rubber material.

4. The leak-proof stainless steel double-press fitting according to claim 1, characterized in that, The first rubber material is hydrogenated nitrile rubber, and the second rubber material is ethylene propylene diene monomer (EPDM) rubber or silicone rubber.

5. A leak-proof stainless steel double-press fitting according to claim 1, characterized in that, The inner wall of the U-shaped groove (2) is provided with a limiting protrusion (34).

6. A leak-proof stainless steel double-press fitting according to claim 1, characterized in that, The arc-shaped support plate (42) is a thin metal plate or a high-strength engineering plastic plate.

7. A leak-proof stainless steel double-clamp pipe fitting according to claim 1, characterized in that, The sealing ring (3) is provided with sealing limit strips (35) on both sides.

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