Double-electric-melting plastic pipe fitting

Abstract

The utility model discloses a double-electric-melting plastic pipe fitting which comprises a pipe body inner layer and a pipe body outer layer, and a gap is formed between the pipe body inner layer and the pipe body outer layer. An inner layer heating wire is arranged on the side wall, close to the outer pipe body layer, of the inner pipe body layer, an outer layer heating wire corresponding to the inner layer heating wire is arranged on the side wall, close to the inner pipe body layer, of the outer pipe body layer, the inner pipe body layer and the inner surface of the welding pipe are welded in a matched mode, and the outer pipe body layer and the outer surface of the welding pipe are welded in a matched mode. The double-electrofusion pipe fitting is reliable in structure, good in use performance and convenient to operate, the double-electrofusion pipe fitting is assembled on the welding pipe, the inner layer of the pipe body is welded to the inner surface of the welding pipe in a matched mode, the outer layer of the pipe body is welded to the outer surface of the welding pipe in a matched mode, the inner surface and the outer surface of the welding pipe are welded to the pipe fitting into a whole, and therefore the welding area and the pressure bearing capacity of the pipe fitting and the pipe are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of plastic pipe fittings, in particular to a double electric fusion plastic pipe fitting. Background Art

[0002] The electric fusion pipe fittings currently available on the market can only weld one side of the pipe, mainly the outer surface of the pipe, and very few pipe fittings can weld the inner surface of the pipe. Since the pipe fittings are only welded to one side of the pipe, their welding area and pressure bearing capacity are limited. After reaching a certain pressure and age, the welding surface will leak, and even the pipe surface will be directly torn and damaged. Therefore, the current electric fusion pipe fittings are only used on low-pressure pipelines below 2.5MPa. If the pressure exceeds 2.5MPa, a mechanical connection with stronger connection capability is required.

[0003] The double hot-melt fittings specially used for PSP steel-plastic composite pipes on the market can also weld the inner and outer surfaces of the pipe, but they adopt the principle of electromagnetic induction heating welding. They require a magnetic steel ring inside the pipe and use the electromagnetic eddy current effect to heat the steel ring inside the pipe and melt the plastic around the steel ring to achieve the welding purpose. This double hot-melt fitting has no heating element of its own and can only be used in conjunction with composite pipes with steel rings inside the pipe. Its scope of use is very small. Pure PE pipes, wire mesh skeleton composite pipes, fiber composite pipes, etc. commonly used on the market cannot be connected using this double hot-melt fitting.

[0004] In addition, the steel ring as the heating element in the PSP pipe is located in the middle layer of the pipe and is far away from the welding surface of the pipe fitting, resulting in a long heat transfer time. It is easy for the plastic around the steel ring to melt completely, while the plastic on the welding surface does not melt due to insufficient temperature, resulting in poor welding. In addition, since there is no observation hole on the pipe fitting, the melting state of the plastic on the welding surface cannot be directly reflected during the welding process, which increases the technical requirements for welding operators, resulting in greater restrictions on its promotion and application. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a double electric fusion plastic pipe fitting.

[0006] The utility model solves the above technical problems with the following technical solutions: a double electric fusion plastic pipe fitting, comprising an inner pipe layer and an outer pipe layer, with a gap between the inner pipe layer and the outer pipe layer;

[0007] An inner heating wire is arranged on the side wall of the outer layer of the tube body close to the outer layer of the tube body, and an outer heating wire corresponding to the inner heating wire is arranged on the side wall of the outer layer of the tube body close to the inner layer of the tube body. The inner layer of the tube body is welded to the inner surface of the welding pipe, and the outer layer of the tube body is welded to the outer surface of the welding pipe.

[0008] Furthermore, a terminal is provided on the outer layer of the tube body, and the terminal is electrically connected to the heating wire.

[0009] Furthermore, an observation hole with an open upper portion is arranged on the outer layer of the tube body, and a plastic nail that can be extruded along the observation hole is arranged in the observation hole.

[0010] Furthermore, a connection block is provided in the gap, and the connection block is used to connect the inner layer of the tube body and the outer layer of the tube body and limit the insertion depth of the welding tube.

[0011] Furthermore, there are two groups of inner layer heating wires and outer layer heating wires, and the two groups of inner layer heating wires are respectively arranged at both ends of the inner layer of the tube body, and the two groups of outer layer heating wires are respectively arranged at both ends of the outer layer of the tube body.

[0012] Furthermore, the terminal is made of conductive metal material.

[0013] The utility model has the following beneficial effects: the double electric fusion plastic pipe fitting provided by the utility model has a reliable structure, good performance and convenient operation. The double electric fusion pipe fitting is assembled on the welded pipe, wherein the inner layer of the pipe body is welded with the inner surface of the welded pipe, and the outer layer of the pipe body is welded with the outer surface of the welded pipe. The inner and outer surfaces of the welded pipe are welded to the pipe fitting as a whole, forming a double-sided welding form, thereby increasing the welding area and pressure bearing capacity of the pipe fittings. In addition, heating wires are distributed on the inner and outer welding surfaces of the pipe fittings, and the pipe fittings themselves have heating and welding capabilities, which can be applied to any plastic pipes welded by heating, greatly increasing their scope of use. In addition, through the specific structural design of the plastic nail in the observation hole, after the plastic is heated and melted, it is squeezed out of the pipe fitting surface, which can intuitively reflect the melting state of the plastic inside the pipe fitting, thereby facilitating the observation of the welding state of the pipe fitting, which is convenient and quick. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the cross-sectional structure of the utility model;

[0015] Figure 1 The reference numerals shown in the figure represent respectively: 1-inner layer of tube body, 2-outer layer of tube body, 3-gap, 4-inner layer heating wire, 5-outer layer heating wire, 6-connecting post, 7-observation hole, 8-connecting block. DETAILED DESCRIPTION

[0016] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0017] like Figure 1As shown, a double electric fusion plastic pipe fitting comprises an inner pipe body layer 1 and an outer pipe body layer 2, wherein a gap 3 is provided between the inner pipe body layer 1 and the outer pipe body layer 2, and a connecting block 8 is provided in the gap 3, wherein the connecting block 8 is used to connect the inner pipe body layer 1 and the outer pipe body layer 2 and limit the insertion depth of the welded pipe.

[0018] The inner layer 1 of the pipe body is welded to the inner surface of the welded pipe, and the outer layer 2 of the pipe body is welded to the outer surface of the welded pipe. The inner and outer surfaces of the welded pipe are welded to the pipe fittings as a whole, thereby increasing the welding area and pressure bearing capacity of the pipe fittings and the pipe, and can withstand a use pressure of more than 2.5MPa.

[0019] An inner heating wire 4 is arranged on the side wall of the inner layer 1 of the pipe body close to the outer layer 2 of the pipe body, and an outer heating wire 5 corresponding to the inner heating wire 4 is arranged on the side wall of the outer layer 2 of the pipe body close to the inner layer 1 of the pipe body. Preferably, the inner heating wire 4 and the outer heating wire 5 are both in two groups, and the two groups of inner heating wires 4 are respectively arranged at the two ends of the inner layer 1 of the pipe body, and the two groups of outer heating wires 5 are respectively arranged at the two ends of the outer layer 2 of the pipe body. The heating wire is made of conductive metal such as copper, aluminum, iron, alloy, etc. The heating wire body is 0.5-2 mm away from the inner layer pipe fittings and the outer layer pipe fittings. After power is turned on, it emits heat under the action of the current to melt the surrounding plastic, so that the plastic at the junction of the pipe fittings and the welding pipe material melts and blends into one. After the power is turned off and the plastic is cooled, it becomes an inseparable whole, thereby achieving the purpose of welding. The pipe fittings themselves have the ability to heat and weld, and can be applied to any plastic pipes welded by heating, greatly increasing their scope of use.

[0020] The outer layer 2 of the pipe body is provided with a terminal 6, which is made of a conductive metal material. The terminal 6 is electrically connected to the heating wire, and the output line of the welding machine is plugged into the terminal 6. After the welding machine outputs current, it is transmitted to the heating wire through the terminal 6, so that the heating wire heats up and melts the plastic of the surrounding pipes and fittings. After the heating stops and the plastic cools, the pipes and fittings can be connected into a whole.

[0021] In addition, an observation hole 7 with an open top is provided on the outer layer 2 of the pipe body, and a plastic nail that can be extruded along the observation hole 7 is provided in the observation hole 7. The state of the plastic nail in the observation hole 7 can reflect the welding state. Specifically, the volume of the plastic expands after being heated and melted, and the plastic nail in the observation hole 7 is squeezed out a certain distance. When the plastic nail in the observation hole 7 emerges from the surface of the pipe fitting to a certain height, it means that the welding has been completed. Since the plastic nail in the observation hole 7 can be squeezed out of the surface of the pipe fitting only after the plastic is heated and melted, it can intuitively reflect the melting state of the plastic inside the pipe fitting, which is an important sign of whether the pipe is well welded.

[0022] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A double electric fusion plastic pipe fitting, characterized in that: It comprises a tube inner layer (1) and a tube outer layer (2), wherein a gap (3) is provided between the tube inner layer (1) and the tube outer layer (2); An inner layer heating wire (4) is arranged on the side wall of the inner layer (1) of the pipe body close to the outer layer (2) of the pipe body, and an outer layer heating wire (5) corresponding to the inner layer heating wire (4) is arranged on the side wall of the outer layer (2) of the pipe body close to the inner layer (1) of the pipe body. The inner layer (1) of the pipe body is welded to the inner surface of the welded pipe, and the outer layer (2) of the pipe body is welded to the outer surface of the welded pipe.

2. The double electric fusion plastic pipe fitting according to claim 1, characterized in that: A terminal post (6) is provided on the outer layer (2) of the tube body, and the terminal post (6) is electrically connected to the heating wire.

3. The double electric fusion plastic pipe fitting according to claim 1, characterized in that: The outer layer (2) of the tube body is provided with an observation hole (7) with an opening at the top, and a plastic nail that can be extruded along the observation hole (7) is provided in the observation hole (7).

4. The double electric fusion plastic pipe fitting according to any one of claims 1 to 3, characterized in that: A connection block (8) is provided in the gap (3) between the inner layer (1) of the pipe body and the outer layer (2) of the pipe body. The connection block (8) is used to connect the inner layer (1) of the pipe body and the outer layer (2) of the pipe body and to limit the insertion depth of the welded pipe.

5. The double electric fusion plastic pipe fitting according to claim 4, characterized in that: The inner layer heating wires (4) and the outer layer heating wires (5) are each in two groups, and the two groups of the inner layer heating wires (4) are respectively arranged at the two ends of the inner layer (1) of the tube body, and the two groups of the outer layer heating wires (5) are respectively arranged at the two ends of the outer layer (2) of the tube body.

6. The double electric fusion plastic pipe fitting according to claim 2, characterized in that: The terminal (6) is made of a conductive metal material.

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