Pipe expansion joint device with pressure compensation function

Abstract

This utility model discloses a pipe expansion joint device with pressure compensation function, including a main pipe body, an expansion tube, and a pressure compensation component. One end of the expansion tube is slidably inserted into the main pipe body, and a composite sealing element is provided between the main pipe body and the expansion tube. The pressure compensation component is sleeved on the connection between the main pipe body and the expansion tube. This utility model simplifies the structure while ensuring pressure compensation and sealing performance by integrating functional components and reducing the number of parts.

Description

Technical Field

[0001] This utility model relates to the field of pipeline connection equipment technology, specifically a pipeline expansion joint device with pressure compensation function. Background Technology

[0002] In industrial pipeline systems, axial displacement and deformation occur due to changes in medium temperature and the thermal expansion and contraction of the pipeline itself. To compensate for this displacement, expansion joints are typically installed. However, existing pipeline expansion joints often lack effective pressure compensation when facing pressure fluctuations within the pipeline, leading to decreased sealing performance and potential media leakage. Furthermore, traditional expansion joints are structurally complex, have high installation and maintenance costs, and offer limited compensation, failing to meet the high reliability and stability requirements of modern industrial pipelines. Therefore, designing a pipeline expansion joint that can effectively compensate for pressure changes, has a simple structure, and provides excellent sealing performance is of significant practical importance. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a pipe expansion joint device with pressure compensation function. By integrating functional components and reducing the number of parts, the structure is simplified while ensuring pressure compensation and sealing performance.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a pipe expansion joint device with pressure compensation function, comprising a main pipe body, an expansion pipe and a pressure compensation component, wherein one end of the expansion pipe is slidably inserted into the main pipe body, a composite sealing element is provided between the main pipe body and the expansion pipe, and the pressure compensation component is sleeved on the connection part between the main pipe body and the expansion pipe.

[0005] Furthermore, the pressure compensation assembly includes a ring spring and a limiting ring. The limiting ring is fixed to the outer wall of the telescopic tube, and one end of the ring spring abuts against the end of the main tube, while the other end abuts against the limiting ring. Using a ring spring to directly achieve pressure compensation replaces the traditional bellows structure, significantly simplifying the pressure compensation mechanism.

[0006] Furthermore, the composite seal includes a sealing ring body, with a guide lip on the inner side and a sealing lip on the outer side. The guide lip is slidably connected to the outer wall of the telescopic tube, and the sealing lip is interference-fitted with the inner wall of the main tube. The composite seal integrates sealing and guiding functions, eliminating the need for a separate guide ring and reducing the number of components.

[0007] Furthermore, a metal skeleton is embedded within the sealing ring body, and the cross-section of the metal skeleton is L-shaped. The metal skeleton enhances the structural strength of the composite seal and prevents the seal from deforming and failing under pressure.

[0008] Furthermore, both the main pipe and the telescopic pipe are equipped with integrated flanges at their ends, and the flanges have mounting holes. The integrated flanges eliminate the need for additional welding, simplifying the connection structure and facilitating quick docking with pipelines.

[0009] The beneficial effects of this utility model are as follows:

[0010] The structure is greatly simplified: the traditional double-layer sleeve structure is simplified to a single sliding fit between the main body and the telescopic tube. The pressure compensation mechanism uses a ring spring to replace multiple sets of bellows and compensation plates, which reduces the number of parts and lowers the manufacturing cost.

[0011] Functional integration and optimization: The composite seal achieves both sealing and guiding functions, eliminating the need for a separate guide ring, reducing assembly steps, and improving installation efficiency.

[0012] Stable and reliable performance: The ring spring has stable elastic compensation capability and can effectively absorb pipeline pressure fluctuations when combined with the limiting structure; the composite seal has a double lip design to ensure dynamic sealing performance and reduce leakage rate.

[0013] Easy installation and maintenance: The integrated flange design simplifies the connection process with pipelines, and the reduction of parts makes disassembly and replacement during maintenance easier, thus reducing later maintenance costs. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0015] Figure 1 This is a schematic diagram of the structure of this utility model.

[0016] Figure 2 This is a schematic diagram of the composite seal. Detailed Implementation

[0017] The technical solution of this utility model will be clearly and completely described below through specific embodiments.

[0018] refer to Figure 1 and Figure 2 This invention relates to a pipe expansion joint device with pressure compensation function. The core structure includes a main pipe body 1, an expansion pipe 2, and a pressure compensation component 3. Both the main pipe body 1 and the expansion pipe 2 are made of seamless steel pipe. One end of the expansion pipe 2 is slidably inserted into the main pipe body 1, and the clearance between the two is controlled at 0.1-0.3mm to ensure smooth expansion and contraction without excessive shaking.

[0019] The pressure compensation assembly 3 consists of a ring spring 31 and a limiting ring 32. The limiting ring 32 is fixed to the outer wall of the telescopic pipe 2 by welding. The ring spring 31 is sleeved on the telescopic pipe 2, with one end abutting against the end of the main pipe 1 and the other end abutting against the limiting ring 32. The ring spring 31 is made of 60Si2Mn spring steel, with a working stroke of 10-30mm and a maximum compensation force of 5000N, effectively absorbing pressure fluctuations in the pipeline.

[0020] A composite seal 4 is installed between the main pipe 1 and the telescopic pipe 2. The sealing ring body 41 of the composite seal 4 is made of oil-resistant nitrile rubber, with an embedded L-shaped metal skeleton 44 made of Q235 steel, which enhances the overall rigidity of the seal. The guide lip 42 on the inner side of the sealing ring body 41 slides in contact with the outer wall of the telescopic pipe 2. The surface roughness Ra of the guide lip 42 is ≤0.8μm to ensure smooth sliding. The sealing lip 43 on the outer side is interference-fitted with the inner wall of the main pipe 1, with an interference amount of 0.2-0.4mm, ensuring a good sealing effect.

[0021] Both the main pipe 1 and the expansion joint 2 are equipped with integrated flanges at their ends. The flanges and pipes are manufactured using an integral forging process, avoiding stress concentration caused by welding. Eight mounting holes, each 18mm in diameter, are evenly distributed on the flanges, allowing for connection to standard pipe flanges.

[0022] When this device is in operation, as the pipeline expands or contracts due to temperature changes, the expansion tube 2 slides within the main pipe 1. The guide lip 42 of the composite seal 4 guides its smooth movement, and the sealing lip 43 always maintains tight contact with the inner wall of the main pipe to prevent media leakage. When the pressure inside the pipeline fluctuates, the annular spring 31, through its own expansion and contraction, pushes the limit ring 32 and the expansion tube 2 to move, achieving pressure compensation and ensuring the stable operation of the pipeline system.

[0023] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Those skilled in the art can make various modifications or equivalent substitutions to the present utility model within its substance and protection scope, and such modifications or equivalent substitutions should also be considered to fall within the protection scope of the present utility model's technical solution.

Claims

1. A pipe expansion joint device with pressure compensation function, characterized in that: It includes a main body (1), a telescopic tube (2) and a pressure compensation component (3). One end of the telescopic tube (2) is slidably inserted into the main body (1). A composite seal (4) is provided between the main body (1) and the telescopic tube (2). The pressure compensation component (3) is sleeved on the connection between the main body (1) and the telescopic tube (2).

2. The pipe expansion joint device with pressure compensation function according to claim 1, characterized in that: The pressure compensation component (3) includes an annular spring (31) and a limiting ring (32). The limiting ring (32) is fixed to the outer wall of the telescopic tube (2). One end of the annular spring (31) abuts against the end of the main tube (1), and the other end abuts against the limiting ring (32).

3. The pipe expansion joint device with pressure compensation function according to claim 1, characterized in that: The composite seal (4) includes a sealing ring body (41), the inner side of the sealing ring body (41) is provided with a guide lip (42), the outer side is provided with a sealing lip (43), the guide lip (42) is slidably connected to the outer wall of the telescopic tube (2), and the sealing lip (43) is interference-fitted with the inner wall of the main tube body (1).

4. The pipe expansion joint device with pressure compensation function according to claim 3, characterized in that: A metal skeleton (44) is embedded in the sealing ring body (41), and the cross-section of the metal skeleton (44) is L-shaped.

5. The pipe expansion joint device with pressure compensation function according to claim 1, characterized in that: The ends of the main tube (1) and the telescopic tube (2) are respectively provided with integrated flanges, and the flanges are provided with mounting holes.

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