PE pipe welding-free butt joint structure
By employing a double sealing structure and three-level sealing protection at the PE pipe connection, the leakage problem of traditional PE pipe weld-free joint structure is solved, achieving an efficient and reliable sealing effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGSU GERON PIPE IND
- Filing Date
- 2025-07-28
- Publication Date
- 2026-06-23
AI Technical Summary
In traditional PE pipe weld-free joint structures, the single sealing structure is prone to leakage problems, posing safety hazards.
It adopts a dual sealing structure, including a first sealing ring and a second sealing ring, and forms a pressure-adaptive sealing system through expansion pack and spring design. Combined with thread drive and sawtooth locking, it achieves three-level sealing protection.
It improves the sealing performance and installation efficiency of pipe connections, reduces the risk of leakage, and ensures long-term reliable operation of the system.
Smart Images
Figure CN224397423U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of pipe connection technology, and in particular to a weld-free butt joint structure for PE pipes. Background Technology
[0002] PE pipes, also known as polyethylene pipes, are pipes made of polyethylene (PE) material. PE is a thermoplastic resin obtained by polymerizing ethylene. These pipes have high flexibility and wear resistance, can withstand water pressure and particulate erosion, reducing maintenance frequency. PE pipes are corrosion resistant and can withstand the erosion of various chemical media except for a few strong oxidants. They do not scale or breed bacteria, avoiding secondary pollution of water quality. PE pipes also have environmental protection and energy-saving characteristics, with low energy consumption and low carbon emissions during production, and can be recycled and reused.
[0003] Depending on the application scenario, PE pipes can be divided into water supply PE pipes, gas supply PE pipes, drainage PE pipes, etc., and are widely used in municipal and building water supply and drainage, gas transmission, cable and wire wiring, agricultural irrigation and industrial sewage discharge, with a service life of more than 50 years.
[0004] However, traditional PE pipes with weld-free joints and a single sealing structure are prone to leakage problems during long-term use, posing safety hazards.
[0005] For example, in municipal water supply systems, ordinary rubber ring sealing structures are prone to compression deformation or displacement under long-term water pressure fluctuations and pipeline settlement, leading to slow leakage at the joints. This not only wastes water resources but may also cause safety hazards such as underground cavities. Utility Model Content
[0006] This utility model discloses a weld-free joint structure for PE pipes, aiming to solve the technical problem that leakage is prone to occur during long-term use when using a single sealing structure, which poses a safety hazard.
[0007] To achieve the above objectives, the present invention adopts the following technical solution:
[0008] A weld-free butt joint structure for PE pipes includes a butt sleeve and further includes:
[0009] Installation mechanism: The installation mechanism is disposed on the outer circumferential wall of the mating sleeve;
[0010] Sealing mechanism: The sealing mechanism is disposed on the inner circumference of the mating sleeve. A first sealing ring and a second sealing ring are disposed on the inner circumference of the mating sleeve. An installation groove is provided on both outer sides of the second sealing ring. Two storage grooves are provided on the inner circumference of the mating sleeve. An expansion pack is disposed on the bottom inner wall of the storage groove. Several equidistant spring pieces are disposed at the opening of the storage groove. A protrusion is disposed on the top outer wall of the spring pieces.
[0011] In this case, the structure features a first and a second sealing ring on the inner wall of the mating sleeve, forming a double sealing barrier. The second sealing ring has mounting grooves on both sides for pipe installation. Together with the expansion pack and spring structure in the receiving groove, it constitutes a pressure-adaptive sealing system. When installing the pipe, the pipe is inserted into the mounting groove, and one end of the pipe applies a thrust to the inclined spring. The tip of the protrusion on the spring applies pressure to the expansion pack, causing it to puncture. The expansion pack contains a water-reactive polyurethane prepolymer. After the expansion pack is punctured, the material is immediately released and, guided by the receiving groove, fills the gap without dead angles, forming a further sealing effect. When the second sealing ring between the two pipes fails, liquid seeps out and reacts with the expansion material in the gap, resealing to prevent leakage. This redundant design improves the overall sealing performance of the structure.
[0012] In a preferred embodiment, the mounting mechanism includes two fixing sleeves. The outer circumferential wall of the mating sleeve is provided with a bidirectional threaded groove, and the inner wall of the fixing sleeve is provided with a threaded structure that matches the bidirectional threaded groove. Both ends of the mating sleeve are provided with a number of equally spaced fixing claws.
[0013] In particular, the installation mechanism realizes a three-in-one pipe connection system of "thread drive - serrated locking - sealing coordination". Through the bidirectional threaded groove and two fixed sleeves, the elastic material fixed claw is pushed to deform and fit against the inner wall of the fixed sleeve and the first sealing ring. The contact design between the fixed claw and the first sealing ring forms a force transmission path, which converts the threaded fastening force into uniform radial sealing pressure, thereby achieving the fastening of the pipes at both ends and improving installation efficiency and sealing performance.
[0014] As described above, a weld-free PE pipe butt joint structure includes a butt sleeve and further comprises: an installation mechanism disposed on the outer circumferential wall of the butt sleeve; and a sealing mechanism disposed on the inner circumferential wall of the butt sleeve. A first sealing ring and a second sealing ring are disposed on the inner circumferential wall of the butt sleeve. Installation grooves are formed on both outer sides of the second sealing ring. Two receiving grooves are formed on the inner circumferential wall of the butt sleeve. An expansion plug is disposed on the bottom inner wall of each receiving groove. Several equidistantly distributed spring pieces are disposed at the opening of each receiving groove, and a protrusion is disposed on the top outer wall of each spring piece. The weld-free PE pipe butt joint structure provided by this utility model has the technical effect of improving the sealing performance of the butt joint structure. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the overall structure of a PE pipe weld-free butt joint structure proposed in this utility model.
[0016] Figure 2 This is a schematic diagram of the installation mechanism for a weld-free butt joint structure for PE pipes proposed in this utility model.
[0017] Figure 3 This is a cross-sectional schematic diagram of a PE pipe weld-free butt joint structure proposed in this utility model.
[0018] Figure 4 For the present utility model in Figure 3 A magnified schematic diagram of the structure at point A in the middle.
[0019] In the attached diagram: 1. Connecting sleeve; 2. Fixing sleeve; 3. First sealing ring; 4. Fixing claw; 5. Bidirectional threaded groove; 6. Second sealing ring; 7. Third sealing ring; 8. Expansion pack; 9. Spring. Detailed Implementation
[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and marked in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.
[0021] The PE pipe weld-free connection structure disclosed in this utility model is mainly used in scenarios where a single sealing structure is prone to leakage during long-term use, posing a safety hazard.
[0022] Reference Figure 1 , Figure 3 and Figure 4 A weld-free PE pipe connection structure includes a connection sleeve 1, and further includes: an installation mechanism: the installation mechanism is set on the outer circumferential wall of the connection sleeve 1; a sealing mechanism: the sealing mechanism is set on the inner circumferential wall of the connection sleeve 1, a first sealing ring 3 and a second sealing ring 6 are provided on the inner circumferential wall of the connection sleeve 1, an installation groove is provided on both sides of the outer wall of the second sealing ring 6, two receiving grooves are provided on the inner circumferential wall of the connection sleeve 1, an expansion pack 8 is provided on the bottom inner wall of the receiving groove, a number of equally spaced spring pieces 9 are provided at the opening of the receiving groove, and a protrusion is provided on the top outer wall of the spring pieces 9.
[0023] In a specific embodiment, the structure forms a double sealing barrier by setting a first sealing ring 3 and a second sealing ring 6 on the inner wall of the connecting sleeve 1. The second sealing ring 6 has installation grooves on both sides for pipe installation. Together with the expansion pack 8 and spring plate 9 in the receiving groove, it constitutes a pressure adaptive sealing system. When the pipe is installed, the pipe is inserted into the installation groove, and one end of the pipe applies a pushing force to the inclined spring plate 9. The tip of the protrusion on the spring plate 9 applies pressure to the expansion pack 8, causing it to be punctured. The expansion pack 8 contains a water-reactive polyurethane prepolymer. After the expansion pack 8 is punctured, the material is released immediately and, guided by the receiving groove, the gap is filled without dead corners, forming a further sealing effect. When the second sealing ring 6 between the two pipes fails, liquid seeps out and reacts with the expansion material in the gap, which can seal again to prevent leakage. This redundant design improves the overall sealing performance of the structure.
[0024] Reference Figure 3 and Figure 4 In a preferred embodiment, the storage slot has a trapezoidal structure, and the length of the spring piece 9 is less than the width of the slot opening.
[0025] Specifically, the storage groove is designed in a trapezoidal shape and the length of the spring 9 is less than the width of the groove. This geometric design gives the sealing system a dual advantage: the trapezoidal structure provides the expansion pack 8 with the best expansion space; when the medium pressure acts on the expansion pack 8, its expansion direction is guided by the trapezoidal slope and the spring 9, so that it can flow more evenly to the joint gap and complete the seal.
[0026] Reference Figure 4 In a preferred embodiment, two sets of third sealing rings 7 are provided on the inner walls of the two mounting grooves. The addition of two sets of third sealing rings 7 in the mounting grooves forms a three-level sealing protection system. The third sealing rings 7 are made of fluororubber, which complements the nitrile rubber of the first sealing ring 3 and the second sealing ring 6. This material can simultaneously resist media corrosion and mechanical wear, reducing the risk of sudden leakage accidents.
[0027] Reference Figure 1 , Figure 2 and Figure 3 In a preferred embodiment, the installation mechanism includes two fixing sleeves 2. The outer circumferential wall of the mating sleeve 1 is provided with a bidirectional threaded groove 5. The inner wall of the fixing sleeve 2 is provided with a threaded structure that matches the bidirectional threaded groove 5. Both ends of the mating sleeve 1 are provided with a number of equally spaced fixing claws 4. The bottom outer wall of the fixing claw 4 is provided with serrated teeth along its length direction. The bottom outer wall of the fixing claw 4 is in contact with the outer circumferential wall of the first sealing ring 3.
[0028] In particular, the installation mechanism realizes a three-in-one pipe connection system of "thread drive - serrated locking - sealing coordination". The bidirectional threaded groove 5, together with two fixed sleeves 2, pushes the elastic material fixed claw 4, causing it to deform and fit against the inner wall of the fixed sleeve 2 and the first sealing ring 3. The contact design between the fixed claw 4 and the first sealing ring 3 forms a force transmission path, which converts the threaded fastening force into uniform radial sealing pressure, thereby achieving the fastening of the pipes at both ends and improving installation efficiency and sealing performance.
[0029] Reference Figure 1 In a preferred embodiment, a plurality of equally spaced grooves are provided on the outer circumferential wall of the fixing sleeve 2. The groove design on the outer wall of the fixing sleeve 2 improves the torque transmission efficiency during wrench operation, avoids slippage during installation, and ensures that the pre-tightening force of the sealing system is accurate and controllable.
[0030] Working principle: In use, first insert the two PE pipes to be connected into the two installation slots respectively. Rotate the fixing sleeve 2, and use its inner wall thread to cooperate with the bidirectional threaded groove 5 on the connecting sleeve 1 to make the fixing sleeve 2 move axially and squeeze the elastic material fixing claw 4. The serrated teeth at the bottom of the fixing claw 4 bite the outer wall of the pipe. At the same time, the radial force generated by its deformation is transmitted through contact with the first sealing ring 3 to form a uniform sealing pressure. At the same time, the end of the pipe is squeezed by the spring piece 9, and the protrusion punctures the expansion pack 8. The water-reactive polyurethane prepolymer is released and fills the gap, which together with the third sealing ring 7 forms a three-level sealing protection. When the medium pressure changes or the second sealing ring 6 fails, the expansion material expands again when it comes into contact with water to achieve self-repair sealing and ensure long-term reliable operation of the system.
[0031] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. The substitutions may be replacements of some structures, devices, or method steps, or they may be complete technical solutions. Equivalent substitutions or modifications made based on the technical solution and inventive concept of this utility model should all be covered within the protection scope of this utility model.
Claims
1. A PE pipe welding-free butt joint structure comprising a butt joint sleeve (1), characterized in that, Also includes: Installation mechanism: The installation mechanism is disposed on the outer circumferential wall of the docking sleeve (1); Sealing mechanism: The sealing mechanism is set on the inner circumference of the docking sleeve (1). The inner circumference of the docking sleeve (1) is provided with a first sealing ring (3) and a second sealing ring (6). The outer walls on both sides of the second sealing ring (6) are provided with mounting grooves. The inner circumference of the docking sleeve (1) is provided with two storage grooves. The bottom inner wall of the storage groove is provided with an expansion pack (8). The opening of the storage groove is provided with several equally spaced spring pieces (9). The top outer wall of the spring piece (9) is provided with a protrusion.
2. A PE pipe welding-free butt joint structure according to claim 1, characterized in that, The storage slot has a trapezoidal structure, and the length of the spring piece (9) is less than the width of the slot opening.
3. A PE pipe welding-free butt joint structure according to claim 2, characterized in that, Two sets of third sealing rings (7) are provided on the inner walls of the two mounting slots.
4. A PE pipe welding-free butt joint structure according to claim 1, characterized in that, The installation mechanism includes two fixed sleeves (2). The outer circumferential wall of the mating sleeve (1) is provided with a bidirectional threaded groove (5). The inner wall of the fixed sleeve (2) is provided with a threaded structure that matches the bidirectional threaded groove (5). Both ends of the mating sleeve (1) are provided with a number of equally spaced fixed claws (4).
5. A PE pipe welding-free butt joint structure according to claim 4, characterized in that, The bottom outer wall of the fixing claw (4) is provided with serrated teeth along its length.
6. A PE pipe welding-free butt joint structure according to claim 5, characterized in that, The bottom outer wall of the fixing claw (4) is in contact with the circumferential outer wall of the first sealing ring (3).
7. A PE pipe welding-free butt joint structure according to claim 6, characterized in that, The outer circumferential wall of the fixing sleeve (2) is provided with several equally spaced grooves.