PE welding sleeve special for prefabricated heat preservation pipeline

Abstract

The utility model discloses a special PE (Poly Ethylene) welding sleeve for a prefabricated thermal insulation pipeline, which relates to the technical field of prefabricated thermal insulation pipeline connection and comprises a PE plate, an electric heating wire mesh is arranged at the upper edge of the plate surface of the PE plate, observation holes are arranged at the upper edge of the plate surface of the PE plate, and the observation holes correspond to the electric heating wire mesh in position. The two ends of the electric heating wire net are fixedly connected with power connection terminals, and material injection exhaust holes are formed in the plate face of the PE plate. According to the utility model, the welding strength can be improved, and the fusion welding effect of the PE plate can be observed, so that whether the welding surface meets the requirement or not and whether the welding quality meets the requirement or not can be directly judged during electric heating fusion welding, and further the welding quality and the quality of thermal insulation foam injection filling are ensured.

Description

Technical Field

[0001] This utility model relates to the field of prefabricated insulated pipe connection technology, and in particular to a special PE welding sleeve for prefabricated insulated pipes. Background Technology

[0002] Currently, PE welding sleeves are used for joint repairs of prefabricated insulated pipes (including pipes and insulation layers). These PE welding sleeves are used to weld the insulation layers (PE pipes) of the prefabricated insulated pipes into a single structure. Insulating foam is then used to fill the space between the insulation layers (PE pipes) of the two prefabricated insulated pipes, ensuring the integrity of the insulation layer, preventing underground liquids from entering the insulation layer, and guaranteeing the insulation performance and service life of the prefabricated insulated pipe. This is a key component of prefabricated insulated pipes.

[0003] However, existing PE welding sleeve products cannot effectively determine whether the PE pipe contact surface has met the requirements for fusion welding. Whether fusion welding has occurred can only be judged by the time of electric current application. Due to the instability of voltage and current during on-site construction, relying solely on time calculation to determine whether fusion welding is qualified is unreliable. This seriously affects the quality of pipeline construction and leaves potential safety hazards for the safe operation and service life of the pipeline in the later stages. If the fusion welding is unqualified, the PE pipe joints will easily be pulled apart and broken due to thermal expansion and contraction during pipeline operation. This will allow underground liquid substances to enter the insulation layer and corrode the steel pipe, thereby reducing the service life of the pipeline and causing heat loss, lowering the temperature of the heat medium in the pipeline, and increasing heating costs. Utility Model Content

[0004] The purpose of this utility model is to address the shortcomings of existing technologies by proposing a special PE welding sleeve for prefabricated insulated pipes.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A special PE welding sleeve for prefabricated insulated pipes includes a PE board, an electric heating wire mesh is provided at the upper edge of the PE board, and observation holes are arranged at the upper edge of the PE board, the observation holes corresponding to the positions of the electric heating wire mesh. Both ends of the electric heating wire mesh are fixedly connected to electrical terminals, and material injection and venting holes are provided on the surface of the PE board.

[0007] As a further improvement of this utility model, the mesh of the electric heating wire mesh is a diamond-shaped mesh.

[0008] As a further improvement of this utility model, the aperture of the rhomboid mesh is 3*5mm.

[0009] As a further improvement of this utility model, the electrical terminal is welded to the electric heating wire mesh.

[0010] As a further improvement of this utility model, the electric heating wire mesh has a U-shaped structure.

[0011] As a further improvement of this utility model, the number of the injection vent holes is two.

[0012] The beneficial effects of this utility model are:

[0013] The electric heating wire mesh with diamond-shaped holes and a hole diameter of 3*5mm can reduce the density of the electrofusion wire mesh, reduce inclusions in the PE board welding surface, and increase welding strength.

[0014] An observation hole is provided so that the welding effect of the PE board can be observed. This allows for direct determination of whether the weld surface meets the requirements during electrofusion welding and whether the welding quality meets the requirements.

[0015] Two injection venting holes are provided. When the insulating foam is injected through one injection venting pipe, the other injection venting pipe can be used to vent the air. The insulating foam can fill the space between the insulation layers (PE pipes) of the two prefabricated insulating pipes, thereby avoiding the formation of cavities. The injection venting holes also allow for easy sampling of the foam to check the foam density and ensure the quality of the insulating foam filling. Attached Figure Description

[0016] Figure 1 This is a structural schematic diagram of a special PE welding sleeve for prefabricated insulated pipes proposed in this utility model;

[0017] Figure 2 This is a schematic diagram of the structure of a prefabricated insulated pipe special PE welding sleeve in use, as proposed in this utility model.

[0018] In the diagram: 1 PE board, 2 electric heating wire mesh, 3 observation hole, 4 material injection and venting hole, 5 electrical terminal. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0020] Reference Figure 1 , Figure 2A special PE welding sleeve for prefabricated insulated pipes includes a PE board 1, an electric heating wire mesh 2 with a U-shaped structure at the upper edge of the PE board 1, observation holes 3 arranged in a row at the upper edge of the PE board 1, the observation holes 3 corresponding to the positions of the electric heating wire mesh 2, and electrical terminals 5 fixedly connected to both ends of the electric heating wire mesh 2, the electrical terminals 5 being welded to the electric heating wire mesh 2, and two injection and venting holes 4 with material filling and venting holes on the surface of the PE board 1.

[0021] In this invention, the electric heating wire mesh 2 has diamond-shaped holes with a diameter of 3*5mm, meaning that one diagonal of the diamond-shaped mesh is 5mm long and the other diagonal is 3mm long.

[0022] In use, this invention involves surrounding and fixing a PE board 1 around the outside of two welded prefabricated insulation pipes. The edge of the PE board 1 overlaps the insulation layer (PE pipe) of the prefabricated insulation pipe, ensuring that the electric heating wire mesh 2 is in contact with the insulation layer (PE pipe). Then, an external power source is connected to the terminal 5, causing the terminal 5 to be energized and heated. This heat melts the surface of the PE board 1 in contact with the insulation layer (PE pipe) of the prefabricated insulation pipe, forming a colloid. The melted colloid then seeps out through the observation hole 3. Then, after the electric heating wire mesh 2 is de-energized and cooled down, the molten colloid cools down and solidifies to achieve fusion welding. The fusion welding effect of PE board 1 can be observed through observation hole 3. This allows for direct judgment on whether the weld surface meets the requirements during electrothermal fusion welding and whether the welding quality meets the requirements. After fusion welding, when the insulation foam is injected through one of the injection and venting pipes 4, it can be vented through the other injection and venting pipe 4. The insulation foam can be used to fill the space between the insulation layers (PE pipes) of the two prefabricated insulation pipes, thereby avoiding the formation of cavities.

[0023] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.

Claims

1. A special PE welding sleeve for prefabricated insulated pipes, characterized in that, The PE board (1) includes an electric heating wire mesh (2) at the upper edge of the PE board (1), and observation holes (3) arranged in a row at the upper edge of the PE board (1). The observation holes (3) correspond to the positions of the electric heating wire mesh (2). Both ends of the electric heating wire mesh (2) are fixedly connected to electrical terminals (5). The PE board (1) has a material injection and venting hole (4) on its surface.

2. The PE welding sleeve for prefabricated insulated pipes according to claim 1, characterized in that, The electric heating wire mesh (2) has diamond-shaped mesh openings.

3. The PE welding sleeve for prefabricated insulated pipes according to claim 2, characterized in that, The aperture of the diamond-shaped mesh is 3*5mm.

4. The PE welding sleeve for prefabricated insulated pipes according to claim 1, characterized in that, The electrical terminal (5) is welded to the electric heating wire mesh (2).

5. A PE welding sleeve for prefabricated insulated pipes according to claim 1, characterized in that, The electric heating wire mesh (2) has a U-shaped structure.

6. A PE welding sleeve for prefabricated insulated pipes according to claim 1, characterized in that, The number of the injection vent holes (4) is two.

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