A connector for pipes

Abstract

This utility model relates to the field of pipe connection technology, and in particular to a pipe connector. The pipe connector includes a butt joint, within which a rubber ring is installed. The rubber ring has a wedge-shaped sealing protrusion and an inner annular cavity. Both ends of the butt joint have external threads, and threaded compression sleeves are fitted onto these threads. A compression protrusion is fixedly fitted to the end of each threaded compression sleeve. In this pipe connector, the rubber ring at the inner annular cavity can expand radially, quickly filling the gap between the outer wall of the pipe and the inner wall of the butt joint, forming a first layer of seal. The multiple tapered sealing lips on the inner wall of the threaded compression sleeve tightly abut against the outer wall of the pipe, forming a second layer of seal. Furthermore, the expansion of the inner annular cavity further increases the abutment force between the sealing lips and the pipe, improving the sealing effect with increasing pressure. This effectively solves the problems of single-seal and leakage-prone traditional connectors.

Description

Technical Field

[0001] This utility model relates to the field of pipe connection technology, and in particular to a pipe connector. Background Technology

[0002] In pipeline transportation systems, pipe connection is a core component ensuring system sealing, stability, and service life, and is widely used in water supply and drainage, gas transportation, industrial fluid transmission, and many other fields. As a key component enabling rapid pipe connection and reliable fixation, the performance of pipe connectors directly affects the operational safety and efficiency of the entire transportation system.

[0003] Existing connectors for smaller diameter pipes mainly include flange connections, clamp connections, and threaded connections. While flange connections offer high connection strength, their installation is cumbersome, requiring multiple auxiliary components such as bolts and nuts, and demanding sufficient installation space, making them unsuitable for confined spaces. Clamp connectors offer easier installation, but their sealing performance deteriorates over time due to the elasticity of the clamp. Traditional threaded connectors generally suffer from a simplistic sealing structure design, relying mostly on a single sealing ring. Minor imperfections on the pipe's outer wall or installation deviations can easily create sealing gaps, leading to fluid leakage. Furthermore, the rubber sealing components of traditional connectors are often integral structures, prone to severe friction with the pipe's outer wall during installation, increasing installation difficulty and potentially damaging the sealing components, thus affecting sealing performance and service life.

[0004] Therefore, it is necessary to provide a new connector for pipes to solve the above-mentioned technical problems. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a connector for pipes.

[0006] The connector for pipes provided by this utility model includes a butt joint. Both ends of the butt joint have inner ring grooves on their inner pipe walls near the pipe openings. A rubber ring sleeve is installed in the inner ring groove. The outer end of the rubber ring sleeve is provided with an integrally formed wedge-shaped sealing protrusion. An inner ring cavity is provided on the sleeve body of the rubber ring sleeve near the wedge-shaped sealing protrusion. Both ends of the connecting pipe are provided with external threads, and a threaded pressing sleeve is fitted on the external thread. The end of the threaded pressing sleeve is fixedly fitted with a pressing protrusion ring for abutting against the wedge-shaped sealing protrusion.

[0007] Preferably, the inner wall of the rubber ring is provided with multiple axially equidistant sealing lips, and the inner ring surface of the sealing lips has a conical structure.

[0008] Preferably, the outer sleeve corresponding to the inner ring cavity has multiple annularly distributed outer ring grooves.

[0009] Preferably, the rubber ring sleeve and the inner sleeve wall corresponding to the inner ring cavity are fitted with a wear-resistant layer.

[0010] Preferably, the sealing lip is located on the rubber ring sleeve inside the inner ring cavity and is positioned close to the inner ring cavity.

[0011] Preferably, the inner diameter of the rubber ring is 0.5-1.2 mm larger than the inner diameter of the connecting pipe.

[0012] Preferably, an abutment ring is fixedly installed in the middle of the inner tube of the connecting pipe.

[0013] Compared with related technologies, the pipe connector provided by this utility model has the following advantages: 1. The rubber ring sleeve of this utility model has an inner ring cavity, which cooperates with the outer ring groove. When the pressing convex ring of the threaded pressing sleeve squeezes the wedge-shaped sealing convex, the rubber ring sleeve at the inner ring cavity can expand radially, quickly filling the gap between the outer pipe wall and the inner pipe wall of the connecting pipe, forming the first seal. The multiple conical sealing lips set in the inner sleeve wall of the threaded pressing sleeve tightly abut against the outer wall of the pipe, forming the second seal. Moreover, after the inner ring cavity expands, it will further increase the abutment force between the sealing lip and the pipe. The sealing effect increases with the increase of pressure, effectively solving the problem of single sealing and easy leakage of traditional connectors. 2. In this utility model, the radially expanding rubber ring fits tightly against the outer wall of the pipe, forming an effective damping effect. Combined with the restraining ring in the middle of the connector, it limits the insertion end of the pipe, effectively preventing the pipe from slipping when subjected to external force or fluid impact, thus improving connection stability and safety. Attached Figure Description

[0014] Figure 1 A schematic diagram of a preferred embodiment of the pipe connector provided by this utility model; Figure 2 for Figure 1 The diagram shows a cross-sectional view of the pipe fitting. Figure 3 for Figure 2 A schematic cross-sectional view of the rubber ring shown. Figure 4 for Figure 2 The diagram shows a cross-sectional view of the threaded sleeve.

[0015] The following are the labels in the diagram: 1. Connecting pipe; 1a. Inner ring groove; 11. Abutting ring; 12. External thread section; 2. Rubber ring sleeve; 2a. Inner ring cavity; 2b. Outer ring groove; 21. Wedge-shaped sealing protrusion; 22. Sealing lip; 3. Threaded pressing sleeve; 31. Pressing protrusion ring. Detailed Implementation

[0016] 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 the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0017] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.

[0018] Please see Figures 1 to 4 The present invention provides a connector for pipes, which includes a butt joint 1, a rubber ring 2, and a threaded compression sleeve 3.

[0019] In the embodiments of this utility model, please refer to Figures 1 to 4 A mating ring 11 is fixedly installed in the middle of the inner tube of the connecting pipe 1. The inner tube walls at both ends of the connecting pipe 1 near the pipe opening are provided with inner ring grooves 1a, and rubber ring sleeves 2 are installed in the inner ring grooves 1a. The outer end of the rubber ring sleeve 2 is provided with an integrally formed wedge-shaped sealing protrusion 21, and the sleeve of the rubber ring sleeve 2 near the wedge-shaped sealing protrusion 21 is provided with an inner ring cavity 2a. The inner sleeve wall of the rubber ring sleeve 2 is provided with multiple axially equidistant sealing lips 22, and the inner ring surface of the sealing lip 22 is a conical structure. The outer sleeve wall of the rubber ring sleeve 2 corresponding to the inner ring cavity 2a is provided with multiple annularly distributed outer ring grooves 2b, and the sealing lips 22 are provided close to the inner ring cavity 2a. Both ends of the connector 1 are provided with external threaded portions 12, and threaded compression sleeves 3 are fitted on the external threaded portions 12. The ends of the threaded compression sleeves 3 are fixedly fitted with compression rings 31 for abutting against wedge-shaped sealing protrusions 21.

[0020] It should be noted that before the two pipes are connected, the rubber ring 2 is inserted into the inner annular groove 1a of the connecting pipe 1 (the end of the rubber ring 2 with the wedge-shaped sealing protrusion 21 is located on the outside), keeping the inner opening of the rubber ring 2 against the inner wall of the inner annular groove 1a, and then the threaded compression sleeve 3 is fitted onto the external thread 12 of the connecting pipe 1 (keeping the two in a connected state). After completion, insert the two pipes into the connector 1 from both ends of the connector 1, and keep the pipe insertion end abutting against the abutment ring 11. Then rotate the threaded compression sleeve 3 so that the compression protrusion ring 31 on the threaded compression sleeve 3 presses against the wedge-shaped sealing protrusion 21. Since the outer sleeve wall corresponding to the inner ring cavity 2a of the rubber ring sleeve 2 has an outer ring groove 2b, when the compression protrusion ring 31 presses the rubber ring sleeve 2, the rubber ring sleeve 2 with the outer ring groove 2b is compressed, and the rubber ring sleeve 2 at its inner ring cavity 2a is then compressed and expands radially. Therefore, the expanded rubber ring sleeve 2 at the inner ring cavity 2a can quickly fill the gap between the outer pipe wall and the inner pipe wall of the connector 1. The radially expanded rubber ring sleeve 2 fits tightly against the outer pipe wall, forming an effective damping effect. Combined with the limiting effect of the abutment ring 11 in the middle of the connector 1 on the pipe insertion end, it can effectively prevent the pipe from slipping when subjected to external force or fluid impact, and improve the connection stability and safety. The sealing lip 22 can abut against the outer wall of the pipe to achieve a seal. Since the sealing lip 22 is set close to the inner ring cavity 2a, when the rubber ring sleeve 2 at the inner ring groove 1a expands, it will increase the abutment force between the sealing lip 22 and the pipe.

[0021] It is worth noting that the rubber ring 2 and the threaded compression sleeve 3 can be flexibly installed in the connecting pipe 1, so that when the rubber ring 2 (or the threaded compression sleeve 3) is damaged, it can be quickly replaced.

[0022] Furthermore, the inner sleeve wall corresponding to the inner ring cavity 2a of the rubber ring sleeve 2 is fitted with a wear-resistant layer. The wear-resistant layer is made of a composite coating material of polytetrafluoroethylene (PTFE) and alumina ceramic particles. It has good chemical stability, is not easy to age, and can maintain wear resistance for a long time. The wear-resistant layer can reduce the friction loss between the pipe and the rubber ring sleeve 2 during the use of the pipe, delay the aging of the rubber ring sleeve 2, and extend the overall service life of the connector. Furthermore, the inner diameter of the rubber ring 2 is larger than the inner diameter of the connecting pipe 1, which can prevent direct friction between the pipe and the rubber ring 2 during pipe insertion, reduce installation resistance, and facilitate quick positioning and docking.

[0023] Furthermore, this application uses reinforced rubber materials (such as adding carbon fiber or aramid fiber to natural rubber) to prepare the rubber ring sleeve 2, which improves its fatigue strength and elastic recovery ability. At the same time, an elastic buffer pad can be added to the contact surface between the compression protrusion ring 31 and the wedge-shaped sealing protrusion 21 to disperse the extrusion stress and reduce local fatigue damage. The surface of the external thread portion 12 is treated with zinc or chrome plating to form an anti-corrosion coating. The internal thread surface of the threaded compression sleeve 3 is coated with long-lasting anti-rust grease, which reduces the frictional resistance during thread mating and isolates it from humid air and corrosive media. For highly corrosive environments, the external thread portion 12 of the threaded compression sleeve 3 and the connecting pipe 1 can be made of stainless steel to fundamentally improve the anti-corrosion performance.

[0024] The working principle of the pipe connector provided by this utility model is as follows: The rubber ring sleeve 2 has an inner ring cavity 2a, which cooperates with the outer ring groove 2b. When the pressing convex ring 31 of the threaded pressing sleeve 3 squeezes the wedge-shaped sealing protrusion 21, the rubber ring sleeve 2 at the inner ring cavity 2a can expand radially, quickly filling the gap between the outer pipe wall and the inner pipe wall of the connecting pipe 1, forming the first layer of seal. The multiple conical sealing lips 22 set on the inner wall of the threaded pressing sleeve 3 tightly abut against the outer wall of the pipe, forming the second layer of seal. After the inner ring cavity 2a expands, it will further increase the abutment force between the sealing lips 22 and the pipe. The sealing effect will improve with the increase of pressure, effectively solving the problem of single seal and easy leakage of traditional connectors. Through the threaded engagement of the threaded pressing sleeve 3 and the external thread 12 of the connecting pipe 1, the pressing convex ring 31 can be precisely pressed against the wedge-shaped sealing protrusion 21 by rotation. No complicated auxiliary tools are required, the installation process is simplified, and the construction efficiency is greatly improved. At the same time, the elastic structure design of the rubber ring sleeve 2 can adapt to pipes of different diameters or slight dimensional deviations of the outer wall of the pipe within a certain range, making it more adaptable.

[0025] The circuits and controls involved in this utility model are all existing technologies, and will not be described in detail here.

[0026] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A connector for pipes, characterized in that, The assembly includes a connecting pipe (1), and both ends of the connecting pipe (1) have inner annular grooves (1a) on their inner walls near the pipe openings. A rubber ring sleeve (2) is installed in the inner annular groove (1a). The outer end of the rubber ring sleeve (2) is provided with an integrally formed wedge-shaped sealing protrusion (21), and the sleeve body of the rubber ring sleeve (2) near the wedge-shaped sealing protrusion (21) has an inner annular cavity (2a). Both ends of the connecting pipe (1) are provided with external threaded parts (12), and a threaded pressing sleeve (3) is fitted on the external threaded part (12). The end of the threaded pressing sleeve (3) is fixedly fitted with a pressing ring (31) for abutting against the wedge-shaped sealing protrusion (21).

2. The connector for pipes according to claim 1, characterized in that, The inner wall of the rubber ring (2) is provided with multiple axially equidistant sealing lips (22), and the inner ring surface of the sealing lip (22) is a conical structure.

3. The connector for pipes according to claim 1, characterized in that, The outer wall of the rubber ring sleeve (2) corresponding to the inner ring cavity (2a) has multiple annularly distributed outer ring grooves (2b).

4. The connector for pipes according to claim 3, characterized in that, The rubber ring (2) and the inner wall of the inner ring cavity (2a) are fitted with a wear-resistant layer.

5. The connector for pipes according to claim 2, characterized in that, The sealing lip (22) is positioned close to the inner ring cavity (2a).

6. The connector for pipes according to claim 1, characterized in that, The inner diameter of the rubber ring (2) is 0.5-1.2 mm larger than the inner diameter of the connecting pipe (1).

7. The connector for pipes according to claim 1, characterized in that, An abutment ring (11) is fixedly installed in the middle of the inner tube of the connecting pipe (1).

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