MPP pipe structure with joint structure

Abstract

The utility model discloses a kind of MPP pipe structure with linking structure, it is characterized by: the outer wall of the spigot part is equipped with at least one annular sealing groove, and the sealing groove is inlaid with sealing ring;The inner wall of the socket part is equipped with annular extrusion flange corresponding to the position of sealing ring on the spigot part, and the outer wall of the socket part is equipped with hoop circle for clamping the socket part;The utility model forms radial active compression sealing by the annular extrusion flange of socket part inner wall and sealing ring on spigot part, and multiple sealing guarantee can be realized;The structure sealing pressure is big, contact is close, can effectively prevent interface leakage caused by soil pressure, ground vibration or thermal expansion and contraction, significantly improve the long-term sealing stability and security of pipeline system.

Description

Technical Field

[0001] This utility model relates to the field of MPP pipe technology, specifically to an MPP pipe structure with a connecting structure. Background Technology

[0002] MPP (modified polypropylene) pipes are widely used in cable protection projects in the power and telecommunications industries due to their high temperature resistance, external pressure resistance, and excellent insulation properties. In actual construction, multiple MPP pipe sections need to be connected to meet project length requirements. Current mainstream connection methods have significant drawbacks: First, hot-melt butt welding requires specialized equipment, and the operation demands strict temperature and pressure control. Ordinary construction workers are prone to improper operation, leading to sealing failure at the joint and causing water and air leaks. Furthermore, the equipment is costly to carry and operate. Second, traditional socket connections rely solely on the pipe's own structural connection, lacking reinforcement and sealing design. Over long-term use, soil subsidence and external vibrations can cause the joint to loosen and detach, affecting cable protection and even posing safety hazards. Therefore, an MPP pipe structure with a unique connection mechanism is proposed. Summary of the Invention

[0003] The purpose of this invention is to solve the above problems by proposing an MPP pipe structure with a connecting structure.

[0004] To achieve the above objectives, this utility model provides the following technical solution: an MPP pipe structure with a connecting structure, including a pipe fitting, one end of which is provided with a plug-in portion, and the other end is provided with a socket portion adapted to the plug-in portion on another identical pipe fitting, characterized in that: the outer wall of the plug-in portion is provided with at least one annular sealing groove, and a sealing ring is embedded in the sealing groove; the inner wall of the socket portion is provided with an annular extrusion flange corresponding to the position of the sealing ring on the plug-in portion, and the outer wall of the socket portion is fitted with a clamping ring for tightening the socket portion.

[0005] Preferably, the clamping ring is an open ring structure with connecting ears at both ends. The connecting ears have through holes and are fastened to the ring by screws and nuts.

[0006] Preferably, the outer wall of the insertion part is provided with at least one limiting protrusion; the inner wall of the receiving part is provided with a limiting guide groove that matches the limiting protrusion.

[0007] Preferably, the limiting guide groove is L-shaped or J-shaped, and includes an axial groove section for the axial sliding of the limiting protrusion and a circumferential groove section for its rotational sliding.

[0008] Preferably, the end of the circumferential groove section is provided with a locking recess.

[0009] Preferably, the limiting protrusion is made of an elastic material and can be engaged in the locking recess.

[0010] Preferably, the outer wall of the end of the plug portion is provided with a guide slope.

[0011] The beneficial effects of this utility model are as follows: the radial active compression seal formed by the annular extrusion flange on the inner wall of the socket and the sealing ring on the plug part can achieve multiple sealing protections; the structure has high sealing pressure and tight contact, which can effectively prevent interface leakage caused by soil pressure, ground vibration or thermal expansion and contraction, and significantly improve the long-term sealing stability and safety of the pipeline system. The clamping ring installed on the outer sleeve of the socket can significantly improve the ring stiffness and deformation resistance of the socket, preventing changes in ellipticity or crushing due to external pressures such as soil pressure and ground load after burial. This ensures the shape stability required for the compression seal from the outside. At the same time, the clamping ring can effectively restrain the expansion deformation that may occur at the socket end during the insertion process, prevent the compression force on the sealing ring from decreasing, ensure the long-term sealing effect after connection, and improve the overall mechanical strength of the connection point.

[0012] The axial groove provides a precise axial sliding channel for the limiting protrusion, ensuring that the limiting protrusion can be stably guided and does not deviate during the insertion process; the circumferential groove restricts the axial degree of freedom of the limiting protrusion to achieve initial axial locking of the two pipe fittings, avoiding loosening or failure of the connection due to external force disturbance; and the cooperation structure between the limiting protrusion and the locking recess further forms an active mechanical interlock, which greatly improves the reliability of axial locking, significantly enhances the pull-out resistance of the pipe fittings after connection, and ensures the long-term stability of the connection mechanism. Attached Figure Description

[0013] Figure 1 is a schematic diagram of the overall connection structure of this utility model; Figure 2 is a schematic diagram of the structure of a single pipe fitting of this utility model; Figure 3 is a partial cross-sectional front view of the pipe fitting connection of this utility model; Figure 4 is a top view of the pipe fitting connection section of this utility model; Figure 4 is a top view of the pipe fitting connection section of this utility model; Figure 5 is a front cross-sectional view of the single-pipe fitting of this utility model; Figure 6 is a schematic diagram of the entire clamping structure of this utility model.

[0014] Legend: 1. Pipe fitting; 11. Insertion part; 111. Sealing groove; 112. Limiting protrusion; 113. Guide slope; 12. Socket part; 121. Extrusion flange; 122. Limiting guide groove; 122a. Axial groove section; 122b. Circumferential groove section; 123. Locking recess; 2. Sealing ring; 3. Hooping ring; 31. Connecting lug; 32. Screw; 33. Nut. Detailed Implementation

[0015] The following description, in conjunction with the accompanying drawings, further illustrates the MPP pipe structure with a connecting structure described in this utility model.

[0016] It should be noted that all directional indications in the embodiments of the present invention, such as up, down, left, right, front, back, etc., are only used to explain the relative positional relationship and movement of the components in a specific posture as shown in the attached figure. If the specific posture changes, the directional indication will also change accordingly.

[0017] See appendix Figure 1-6 As shown, this utility model discloses an MPP pipe structure with a connecting structure, including a pipe fitting 1. One end of the pipe fitting 1 is provided with a plug-in portion 11, and the other end is provided with a socket portion 12 adapted to the plug-in portion 11 on another identical pipe fitting 1. The plug-in portion 11 has at least one annular sealing groove 111 on its outer wall, and a sealing ring 2 is embedded in the sealing groove 111. The socket portion 12 has an annular extrusion flange 121 on its inner wall corresponding to the position of the sealing ring 2 on the plug-in portion 11. The socket portion 12 has a clamping ring 3 fitted on its outer wall for clamping the socket portion 12.

[0018] The sealing ring 3 is made of elastic material. Before the connection operation, the sealing ring 2 needs to be pre-embedded in the sealing groove 111 of the insertion part 11. When the connection is made, the insertion part 11 of one pipe fitting 1 is inserted into the socket part 12 of another pipe fitting 1. The annular extrusion flange 121 on the inner wall of the socket part 12 will be precisely and forcefully squeezed into the position of the sealing groove 111, forming radial compression on the sealing ring 2, causing it to produce significant elastic deformation, thereby achieving a tight radial active seal at the interface of the two pipe fittings 1.

[0019] After the connection is completed, a stirrup ring 3 is fitted on the outer wall of the socket 12. The stirrup ring 3 is used to hold the socket 12 tightly, so that the socket 12 and the insertion part 11 fit tightly together, further increasing the sealing of the connection between the two.

[0020] The radial active compression seal formed by the annular extrusion flange 121 on the inner wall of the socket 12 and the sealing ring 2 on the plug part 11 can achieve multiple sealing protections. This structure has high sealing pressure and tight contact, which can effectively prevent interface leakage caused by soil pressure, ground vibration or thermal expansion and contraction, and significantly improve the long-term sealing stability and safety of the pipeline system. The clamping ring 3, which is installed over the socket 12, can significantly improve the ring stiffness and deformation resistance of the socket 12, preventing changes in ellipticity or crushing due to external pressures such as soil pressure and ground load after burial. This ensures the shape stability required for the compression seal from the outside. At the same time, the clamping ring 3 can effectively restrain the expansion deformation that may occur at the port of the socket 12 during the insertion process, prevent the compression force on the sealing ring 2 from decreasing, ensure the long-term sealing effect after connection, and improve the overall mechanical strength of the connection point.

[0021] See appendix Figure 1 , 6 As shown, the clamping ring 3 is an open ring structure with connecting ears 31 at both ends. The connecting ears 31 have through holes and are fastened to the nuts 33 by screws 32. Before the two pipe fittings 1 are connected, the clamping ring 3 needs to be fitted onto the outer wall of the socket part 12 of one of the pipe fittings 1. After the insertion part 11 of the other pipe fitting 1 is fully inserted into the socket part 12 to complete the connection of the pipe fittings 1, the screws 32 are passed through the through holes on the two connecting ears 31 and the nuts 33 are tightened. During the tightening process, the fastening mechanism composed of the screws 32 and the nuts 33 will generate a strong pulling force, forcing the connecting ears 31 at both ends to come closer together, thereby causing the entire clamping ring 3 to contract radially, and finally evenly and tightly clamped to the outer wall of the socket part 12 to achieve the best fastening effect.

[0022] See appendix Figure 2-5 As shown, the outer wall of the insertion part 11 is also provided with at least one limiting protrusion 112; the inner wall of the receiving part 12 is provided with a limiting guide groove 122 that matches the limiting protrusion 112; the limiting guide groove 122 is L-shaped or J-shaped, and includes an axial groove section 122a for the axial sliding of the limiting protrusion 112 and a circumferential groove section 122b for its rotational sliding; the end of the circumferential groove section 122b is provided with a locking recess 123; the limiting protrusion 112 is made of elastic material and can be inserted into the locking recess 123.

[0023] During insertion, align the limiting protrusion 112 on the insertion part 11 with the entrance of the upper guide groove 122 on the socket part 12, and push the pipe fitting 1 axially so that the limiting protrusion 112 slides to the bottom along the axial groove section 122a. At this time, rotate any pipe fitting 1 so that the limiting protrusion 112 rotates from the axial groove section 122a and slides along the circumferential groove section 122b. This rotational action directly achieves the initial axial locking of the two pipe fittings 1. When the limiting protrusion 112 slides to the locking recess 123 at the end of the circumferential groove section 122b, under the action of rotational pressure, the limiting protrusion 112, made of elastic material, will undergo slight deformation and finally be stuck in the locking recess 123, while producing a clear "click" locking feeling, which makes it easy for the operator to visually confirm that the locking is in place.

[0024] The axial groove 122a provides a precise axial sliding channel for the limiting protrusion 112, ensuring that the limiting protrusion 112 can be stably guided and does not deviate during the insertion process; the circumferential groove 122b restricts the axial degree of freedom of the limiting protrusion 112 to achieve the initial axial locking of the two pipe fittings 1, avoiding loosening or failure of the connection due to external force disturbance; and the cooperation structure between the limiting protrusion 112 and the locking recess 123 further forms an active mechanical interlock, which greatly improves the reliability of axial locking, significantly enhances the pull-out resistance of the pipe fittings 1 after connection, and ensures the long-term stability of the connection mechanism.

[0025] See appendix Figure 2 , 5 As shown, the outer wall of the end of the plug-in part 11 is provided with a guide slope 113; the guide slope 113 can guide the plug-in part 11 to smoothly and accurately align and slide into the port of the socket part 12, effectively avoiding the impact on installation efficiency due to jamming at the edge of the opening, thereby ensuring a fast and smooth connection; at the same time, the slope transition structure can reduce the rigid impact between the edges of the plug-in part 11 and the port of the socket part 12, effectively reducing the risk of collision damage to the ends of both, and protecting the structure of the pipe fitting 1.

[0026] In the process of using this utility model, the insertion part 11 of one pipe fitting 1 is aligned with the port of the socket part 12 of another pipe fitting 1, so that the limiting protrusion 112 on the outer wall of the insertion part 11 is aligned with the entrance of the axial groove section 122a of the limiting guide groove 122 on the inner wall of the socket part 12; then, guided by the guide slope 113 at the end of the insertion part 11, force is applied smoothly along the axial direction to push the insertion part 11 into the socket part 12; during this process, the limiting protrusion 112 will slide stably along the axial groove section 122a until it reaches the bottom of the groove section.

[0027] Once the limiting protrusion 112 reaches the bottom of the axial groove 122a, hold the pipe fitting and rotate any one of the pipe fittings 1 clockwise or counterclockwise according to the L-shaped or J-shaped direction of the limiting guide groove 122. At this time, the limiting protrusion 112 will rotate from the axial groove 122a and slide along the circumferential groove 122b. Continue to rotate until the limiting protrusion 112 slides to the end of the circumferential groove 122b. During this process, the operator will feel a slight "click" or resistance when the limiting protrusion 112, made of elastic material, is inserted into the locking recess 123, which indicates that the axial locking has been completed.

[0028] After confirming that the rotation lock is in place, use a wrench or other tools to tighten the clamping ring 3 fitted on the outer wall of the socket 12: tighten the screws 32 and nuts 33 on the connecting ears 31 at both ends of the clamping ring 3. As the screws 32 and nuts 33 are tightened, the clamping ring 3 will produce uniform radial contraction, closely adhering to and clamping the outer wall of the socket 12, thereby driving the inner wall of the socket 12 to closely adhere to the outer wall of the insertion part 11, thus completing the entire connection process.

[0029] The above embodiments are illustrative of the present invention and are not intended to limit the present invention. Any simple modifications to the present invention are within the protection scope of the present invention.

Claims

1. An MPP pipe structure with a connecting structure, comprising a pipe fitting (1), wherein one end of the pipe fitting (1) is provided with a plug-in portion (11), and the other end is provided with a socket portion (12) adapted to the plug-in portion (11) on another identical pipe fitting (1), characterized in that: The outer wall of the plug-in part (11) is provided with at least one annular sealing groove (111), and a sealing ring (2) is embedded in the sealing groove (111); the inner wall of the socket part (12) is provided with an annular extrusion flange (121) corresponding to the position of the sealing ring (2) on the plug-in part (11), and the outer wall of the socket part (12) is fitted with a clamping ring (3) for clamping the socket part (12).

2. The MPP pipe structure with a connecting structure according to claim 1, characterized in that: The clamping ring (3) is an open ring structure with connecting ears (31) at both ends. The connecting ears (31) have through holes and are fastened to nuts (33) by screws (32).

3. The MPP pipe structure with a connecting structure according to claim 1, characterized in that: The outer wall of the insertion part (11) is also provided with at least one limiting protrusion (112); the inner wall of the socket part (12) is provided with a limiting guide groove (122) that matches the limiting protrusion (112).

4. An MPP pipe structure with a connecting structure according to claim 3, characterized in that: The limiting guide groove (122) is L-shaped or J-shaped, and includes an axial groove section (122a) for the axial sliding of the limiting protrusion (112) and a circumferential groove section (122b) for its rotational sliding.

5. An MPP pipe structure with a connecting structure according to claim 4, characterized in that: The end of the circumferential groove section (122b) is provided with a locking recess (123).

6. An MPP pipe structure with a connecting structure according to claim 5, characterized in that: The limiting protrusion (112) is made of elastic material and can be inserted into the locking recess (123).

7. An MPP pipe structure with a connecting structure according to claim 1, characterized in that: The outer wall of the end of the plug part (11) is provided with a guide slope (113).

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