Composite pipe connecting structure

Abstract

The composite pipe connecting structure comprises two composite pipes and two electric melting pipe connectors, each composite pipe comprises an inner-layer pipe, a reinforcing layer and an outer-layer pipe which are sequentially connected from inside to outside, butt joint grooves are formed in the ends, close to each other, of the two composite pipes, and the butt joint grooves are formed by stripping the reinforcing layers and the outer-layer pipes; resistance wires are evenly distributed on the inner walls of the two electric melting pipe connectors, a first melting zone and a second melting zone are arranged on the inner walls of the electric melting pipe connectors, the inner diameter of the first melting zone is smaller than that of the second melting zone, the first melting zone is used for being arranged on the butt joint groove in a sleeved mode, the second melting zone is used for being arranged on the outer layer pipe in a sleeved mode, and the two electric melting pipe connectors can be welded into a whole. The composite pipe connecting structure has the advantages that the sealing performance is improved, and the water seepage risk is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of composite pipe connection, and in particular to a composite pipe connection structure. Background Art

[0002] During pipeline emergency repair or pipeline prefabrication, it is often necessary to connect two sections of composite pipes into one. Currently, this is done by directly sleeve an electric fusion pipe at the connection between the two sections of composite pipes and fix them by electric fusion welding. However, this connection structure makes it difficult to ensure the sealing of the ends of the composite pipes, resulting in water leakage from the ends of the pipes and the risk of water seepage. Utility Model Content

[0003] The main purpose of the present application is to provide a composite pipe connection structure, aiming to solve the technical problem of poor sealing of the existing composite pipe connection structure.

[0004] To achieve the above-mentioned purpose, the present application provides a composite pipe connection structure, including two composite pipes and two electric fusion pipe joints, the composite pipe including an inner layer pipe, a reinforcement layer and an outer layer pipe connected in sequence from the inside to the outside, and a docking groove is provided at one end of the two composite pipes close to each other, and the docking groove is formed by peeling off the reinforcement layer and the outer layer pipe; resistance wires are evenly distributed on the inner walls of the two electric fusion pipe joints, and a first melting zone and a second melting zone are provided on the inner walls of the electric fusion pipe joints, the inner diameter of the first melting zone is smaller than the inner diameter of the second melting zone, the first melting zone is used to be sleeved on the docking groove, and the second melting zone is used to be sleeved on the outer layer pipe, and the two electric fusion pipe joints can be welded into one.

[0005] Optionally, one side of the butt joint groove corresponding to the reinforcement layer and the outer layer pipe is cut, the angle of the cut is 90° to 170°, and the inner wall of the electric fusion pipe joint is provided with a step surface matching the cut.

[0006] Optionally, the ends of the two electric fusion pipe joints that are close to each other are both flat end faces, and the two electric fusion pipe joints are welded into one by facing the flat end faces.

[0007] Optionally, an outer jacket electric fusion pipe is sleeved on the two electric fusion pipe joints, and the outer jacket electric fusion pipe is used to electro-fuse and weld the two electric fusion pipe joints into one.

[0008] Optionally, a step groove is provided at the connection end of one of the electric fusion pipe joints, and a step hole matching the step groove is provided on the inner wall of the connection end of the other electric fusion pipe joint.

[0009] Optionally, the step groove is provided with a chamfer.

[0010] Optionally, the length of the docking groove is L1, and L1 ≥ 20 mm.

[0011] Optionally, the wall thickness of the electric fusion pipe joint corresponding to the first fusion zone is assumed to be e1, and e1 satisfies the following conditions:

[0012] (e1+e4)≥dn1 / SDR;

[0013] Where e4 is the wall thickness of the inner tube, dn1 is the outer diameter of the outer tube, and SDR is the standard dimension ratio of the tube.

[0014] The beneficial effects that this application can achieve are as follows:

[0015] The present application includes two composite pipes and two electric fusion pipe joints. The composite pipes include an inner pipe, a reinforcement layer and an outer pipe connected in sequence from the inside to the outside. The ends of the two composite pipes close to each other are provided with docking grooves, and the docking grooves are formed by peeling off the reinforcement layer and the outer pipe. Resistance wires are evenly distributed on the inner walls of the two electric fusion pipe joints. A first melting zone and a second melting zone are provided on the inner walls of the electric fusion pipe joints. The inner diameter of the first melting zone is smaller than the inner diameter of the second melting zone. The first melting zone is used to be sleeved on the docking groove, and the second melting zone is used to be sleeved on the outer pipe. The two electric fusion pipe joints can be welded into one. The present application forms a butt joint groove by peeling off a section of the reinforcing layer and the outer tube on one side of the composite pipe connection end, and then sleeves the composite pipe connection end with two electric fusion pipe joints respectively, and based on the first melting zone and the second melting zone of the inner wall of the electric fusion pipe joint, the first melting zone is sleeved on the butt joint groove, and the second melting zone is sleeved on the outer tube, so that electric fusion connection can be performed with the outer tube and the inner tube at the same time, reducing the risk of loosening when sleeved with a single pipeline, improving the sealing performance, and after being connected as one, the electric fusion pipe joint and the composite pipe form a staggered connection, which has better sealing performance and reduces the risk of water seepage. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the prior art description. In all drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0017] Figure 1 This is a structural schematic diagram of a composite pipe connection structure in an embodiment of the present application;

[0018] Figure 2 This is a schematic diagram of the assembly structure of the composite pipe and the electric fusion pipe joint with a step groove in the embodiment of the present application;

[0019] Figure 3 This is a schematic diagram of the assembly structure of the composite pipe and the electric fusion pipe joint with a stepped hole in the embodiment of the present application;

[0020] Figure 4 This is another structural schematic diagram of a composite pipe connection structure in an embodiment of the present application;

[0021] Figure 5This is a schematic diagram of the assembly structure of the composite pipe and the electric fusion pipe joint with a flat end surface in the embodiment of the present application;

[0022] Figure 6 It is a schematic diagram of the structure of the composite tube in the embodiment of the present application;

[0023] Figure 7 It is a schematic diagram of the structure of the composite tube in the embodiment of the present application;

[0024] Figure 8 It is a structural schematic diagram of an electric fusion pipe joint in an embodiment of the present application;

[0025] Fig. 9 It is a schematic diagram of the structure when a cylindrical plug is installed in the composite pipe in the embodiment of the present application.

[0026] Reference numerals:

[0027] 110-composite pipe, 111-inner pipe, 112-reinforcement layer, 113-outer pipe, 120-electric fusion pipe joint, 121-step surface, 122-step groove, 123-step hole, 130-jacketed electric fusion pipe, 140-butt groove, 150-resistance wire, 160-cylindrical plug.

[0028] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0030] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0031] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0032] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0033] Example

[0034] Reference Figure 1-Figure 9 The present embodiment provides a composite pipe connection structure, including two composite pipes 110 and two electric fusion pipe joints 120. The composite pipe 110 includes an inner layer pipe 111, a reinforcement layer 112 and an outer layer pipe 113 connected in sequence from the inside to the outside. The inner layer pipe 111 and the outer layer pipe 113 can both be made of plastic. The ends of the two composite pipes 110 close to each other are both provided with a docking groove 140, and the docking groove 140 is formed by peeling the reinforcement layer 112 and the outer layer pipe 113; the inner walls of the two electric fusion pipe joints 120 are uniformly provided with resistance wires 150, and the inner walls of the electric fusion pipe joints 120 are provided with a first melting zone and a second melting zone, the inner diameter of the first melting zone is smaller than the inner diameter of the second melting zone, the first melting zone is used to be sleeved on the docking groove 140, and the second melting zone is used to be sleeved on the outer layer pipe 113, and the two electric fusion pipe joints 120 can be welded into one.

[0035] In this embodiment, a butt joint groove 140 is formed by peeling off a section of the reinforcing layer 112 and the outer tube 113 on one side of the connection end of the composite tube 110, and then two electric fusion pipe joints 120 are respectively sleeved on the connection ends of the composite tube 110, and based on the first melting zone and the second melting zone of the inner wall of the electric fusion pipe joint 120, the first melting zone is sleeved on the butt joint groove 140, and the second melting zone is sleeved on the outer tube 113, so that the outer tube 113 and the inner tube 111 can be simultaneously electrofused to each other, reducing the risk of loosening when sleeved with a single pipeline, improving the sealing performance, and after being connected as one, the electric fusion pipe joint 120 and the composite tube 110 form a staggered connection, which has better sealing performance and reduces the risk of water seepage.

[0036] As an optional embodiment, when processing the docking groove 140 at the port of the composite pipe 110, first peel off the outer layer pipe 113 and the reinforcing layer 112, and design the peeling size to be L1, that is, the length of the docking groove 140 is L1, L1 ≥ 20 mm, and L2 is the subsequent pipe end sealing welding size; in particular, when processing the port of the composite pipe 110, it is necessary to ensure that the outer layer pipe 113 and the reinforcing layer 112 are peeled off and removed cleanly, and after peeling, the thickness of the inner layer pipe 111 is e4 ≥ 2 mm, and the outer diameter of the inner layer pipe 111 is dn2, so as to ensure the stability of the subsequent connection.

[0037] As an optional embodiment, the side of the docking groove 140 corresponding to the reinforcement layer 112 and the outer tube 113 is a cut, and the angle of the cut is 90° to 170°. The inner wall of the electric fusion pipe joint 120 is provided with a step surface 121 that cooperates with the cut. The cut is preferably an oblique cut, which can increase the contact area with the electric fusion pipe joint 120, thereby improving the reliability of the electric fusion connection structure.

[0038] As an optional implementation, the ends of the two electrofusion pipe joints 120 that are close to each other are both flat end faces, and the two electrofusion pipe joints 120 are welded together by facing the flat end faces. This connection structure is mainly used for medium and low pressure pipeline connections.

[0039] As an optional implementation, an outer sleeve electric fusion pipe 130 is sleeved on the two electric fusion pipe joints 120. The outer sleeve electric fusion pipe 130 is used to weld the two electric fusion pipe joints 120 into one. This connection structure is mainly used for medium and high pressure pipeline connection.

[0040] As an optional implementation, a step groove 122 is provided at the connection end of one of the electric fusion pipe joints 120 , and a step hole 123 matching with the step groove 122 is provided on the inner wall of the connection end of the other electric fusion pipe joint 120 .

[0041] In this embodiment, the two electric fusion pipe joints 120 can be tightly fitted together through the cooperation of the step groove 122 and the step hole 123. After the electric fusion connection, the connection positions of the two electric fusion pipe joints 120 are staggered, thereby further improving the sealing performance and improving the anti-water seepage performance.

[0042] As an optional implementation, the step groove 122 is provided with a chamfer to facilitate quick docking with the step hole 123 .

[0043] As an optional implementation, assume that the wall thickness of the first fusion zone in the electric fusion pipe joint 120 is e1, and e1 satisfies the following conditions:

[0044] (e1+e4)≥dn1 / SDR;

[0045] In the formula, e4 is the wall thickness of the inner tube 111, dn1 is the outer diameter of the outer tube 113, and SDR is the standard dimension ratio of the tube.

[0046] In this embodiment, the parameters of the electrofusion pipe joint 120 are designed according to the above formula, so as to meet the product quality requirements.

[0047] The manufacturing method of the composite pipe connection structure of the present application is as follows:

[0048] Step S1: first prepare the composite tube 110 to be processed at the port, and then plug the inner wall of the port of the composite tube 110 with a cylindrical plug 160. The cylindrical plug 160 is designed with a straight section L3, L3>L1, and the outer diameter of the cylindrical plug 160 is dn3, which satisfies the condition: (dn2-e4*2+1)mm≥dn3≥(dn2-e4*2)mm, thereby supporting the port of the composite tube 110 to make the port of the composite tube 110 round, which is convenient for subsequent port cutting and peeling.

[0049] Step S2: After the end of the composite pipe 110 is fully rounded, the composite pipe 110 is fed into a stripping and cutting machine to strip the outer layer 113 and the reinforcing layer 112 of the composite pipe 110. A planetary cutting machine is used to cut the outer layer 113 and the reinforcing layer 112 of the pipe by means of a multi-gear cutting blade, high-speed self-rotation and rapid revolution around the pipe. The feed rate of the cutting blade in the stripping and cutting machine is adjusted to ensure that the cutting depth is e3+e2, wherein e3 is the thickness of the outer layer 113 and e2 is the thickness of the reinforcing layer 112, to ensure that the outer layer 113 of the composite pipe 110 and the middle reinforcing layer 112 are completely stripped, and finally the docking groove 140 is cut;

[0050] Step S2: preparing the electric fusion pipe joint 120, and its manufacturing method includes but is not limited to: injection molding, thick-walled pipe turning, the electric fusion pipe joint 120 is divided into an LA section and a LB section, the LB section is turned to have an inner diameter dn1, which matches the outer diameter dn1 of the composite pipe 110, and the LA section is turned to have an inner diameter dn2, which matches the outer diameter dn2 after the composite pipe 110 is peeled off; the LA section includes a first melting zone, and the LB section includes a second melting zone, the second melting zone is used to weld the inner layer pipe 111 (i.e., the L1 section in the figure), and the second melting zone is used to weld the outer layer pipe 113 (i.e., the L2 section in the figure); the wire laying process of the resistance wire 150 in the electric fusion pipe joint 120 includes but is not limited to, adopting a post-wire laying process, feeding from the first side direction, then rotating in the second side direction, and retracting in the first side direction, to ensure that both ends of the resistance wire 150 are in the first side direction; wherein the first side direction and the second side direction are the two side directions of the electric fusion pipe joint 120 respectively;

[0051] Step S3: welding the electric fusion pipe joint 120 to the port of the composite pipe 110, pre-grinding the L1 section and the L2 section of the port of the composite pipe 110 to remove the oxide layer, and then installing the electric fusion pipe joint 120 to the port of the composite pipe 110, and then welding. To avoid the inner wall of the pipe port from collapsing during the welding process, a cylindrical plug 160 is inserted into the pipe port during the welding process, and the cylindrical plug 160 is removed after the welding is completed. After the welding is completed, the end face of the pipe is flattened or turned according to different pipeline connection methods.

[0052] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A composite pipe connection structure, characterized in that: include: Two composite pipes, the composite pipes comprising an inner pipe, a reinforcement layer and an outer pipe connected in sequence from the inside to the outside, and a butt joint groove is provided at one end of the two composite pipes close to each other, the butt joint groove is formed by peeling off the reinforcement layer and the outer pipe; Two electric fusion pipe joints, the inner walls of the two electric fusion pipe joints are evenly distributed with resistance wires, the inner walls of the electric fusion pipe joints are provided with a first melting zone and a second melting zone, the inner diameter of the first melting zone is smaller than the inner diameter of the second melting zone, the first melting zone is used to be sleeved on the butt groove, and the second melting zone is used to be sleeved on the outer layer pipe, and the two electric fusion pipe joints can be welded into one.

2. A composite pipe connection structure according to claim 1, characterized in that: The side of the butt joint groove corresponding to the reinforcement layer and the outer layer pipe is a cutout, the angle of the cutout is 90° to 170°, and the inner wall of the electric fusion pipe joint is provided with a step surface matching the cutout.

3. A composite pipe connection structure according to claim 1 or 2, characterized in that: The ends of the two electrofusion pipe joints close to each other are both flat end faces, and the two electrofusion pipe joints are welded into one body through the flat end faces.

4. A composite pipe connection structure according to claim 1 or 2, characterized in that: An outer sleeve electric fusion pipe is sleeved on the two electric fusion pipe joints, and the outer sleeve electric fusion pipe is used for electric fusion welding the two electric fusion pipe joints into one.

5. A composite pipe connection structure according to claim 4, characterized in that: A step groove is provided at the connection end of one of the electric fusion pipe joints, and a step hole matching with the step groove is provided on the inner wall of the connection end of the other electric fusion pipe joint.

6. A composite pipe connection structure according to claim 5, characterized in that: The step groove is provided with a chamfer.

7. A composite pipe connection structure according to claim 1, characterized in that: Assume that the length of the docking groove is L1, L1≥20mm.

8. A composite pipe connection structure according to claim 1, characterized in that The wall thickness of the electric fusion pipe joint corresponding to the first fusion zone is e1, and e1 satisfies the following conditions: (e1+e4)≥dn1 / SDR; Wherein, e4 is the wall thickness of the inner tube, dn1 is the outer diameter of the outer tube, and SDR is the standard dimension ratio of the tube.

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