Steel-plastic composite pipeline connecting device

Abstract

A steel-plastic composite pipeline connecting device comprises a metal layer, plastic pipeline layers are compounded on the inner side and the outer side of the metal layer to jointly form a first steel-plastic composite pipe, the inner circumference of the first steel-plastic composite pipe is connected with a second electric hot melting pipe fitting in a fusion mode through a second electric heating wire, and the axial end face of the first steel-plastic composite pipe is matched with a first plastic protruding ring. The first plastic convex ring and the outer circumference of the first steel-plastic composite pipe are jointly welded to a first electric hot melting pipe fitting through a first electric heating wire, the first electric heating wire is installed on the inner wall of the first electric hot melting pipe fitting, and the second electric heating wire is installed on the outer wall of the second electric hot melting pipe fitting. According to the steel-plastic composite pipeline connecting device, the electric hot melting pipe fittings are welded to the inner side and the outer side of the steel-plastic composite pipe through the electric heating wires, water vapor is prevented from making contact with a metal layer, the axial end face of the steel-plastic composite pipe is sealed through welding by further adopting a plastic protruding ring, and the exposed axial end face of the metal layer is prevented from rusting.

Description

Technical Field

[0001] The utility model relates to the field of steel-plastic composite pipelines, in particular to a steel-plastic composite pipeline connecting device. Background Art

[0002] Steel-plastic composite pressure pipe is a new type of metal-plastic composite pipe developed in recent years. It uses welded steel pipe as the middle layer, and the inner and outer layers are polyethylene (propylene) plastics. It uses special hot melt adhesive and is compounded into a pipe through extrusion molding. Compared with plastic pipes, it has the characteristics of high pressure bearing and strong impact resistance. The plastics in the inner and outer layers play an anti-corrosion role. It has the advantages of smooth inner wall, chemical corrosion resistance, no pollution, small fluid resistance, no scaling, no microbial breeding, and no secondary pollution of fluid. The service life is up to 50 years. This pipe overcomes the defects of easy rust, pollution, bulky, short service life of steel pipes and low strength, large expansion, and easy deformation of plastic pipes, and has the common advantages of steel pipes and plastic pipes, such as good oxygen isolation, high rigidity and high strength, and easy detection of buried pipes.

[0003] Currently, the main connection methods for steel-plastic composite pipes on the market are mechanical connection and double hot-melt transition socket connection.

[0004] Chinese patent publication number CN206310117U discloses an electromagnetic hot-melt pipe fitting, one end of the socket is connected to the PSP steel-plastic composite pipe by electromagnetic double hot-melt, and the other end is connected to the PPR pure plastic fitting by single hot-melt socket. The connection between the PSP steel-plastic composite pipe and the PPR pure plastic fitting is realized by this electromagnetic hot-melt pipe fitting. The pipe fitting and the pipe are made of the same material, and the double-layer hot-melt sealing of the socket is first used. The electromagnetic double hot-melt connection described in this electromagnetic hot-melt pipe fitting is essentially to heat the inner and outer surfaces of the PSP steel-plastic composite pipe and then weld the double hot-melt connection end while the PSP steel-plastic composite pipe is in a melted state. Although this welding method realizes the welding of the inner and outer surfaces of the steel-plastic composite pipe, on the one hand, it adopts plug-in welding, and the welding performance is unstable. On the other hand, the end face of the steel-plastic composite pipe cannot be heated because it is not heated, that is, it is not sealed, which will eventually lead to rust and rot, and this heating method requires the use of a heating mold and is not suitable for urban building pipelines.

[0005] For the above-mentioned prior art, the object of research of those skilled in the art is how to achieve good airtight and rust-proof connection performance of steel-plastic composite pipes in the process of connecting urban building pipelines. Utility Model Content

[0006] The utility model aims to provide a steel-plastic composite pipe connecting device which has a simple structure, is convenient to construct and is suitable for urban building pipes with different diameters, in view of the defects and shortcomings of the prior art.

[0007] In order to achieve the above-mentioned purpose, the utility model provides a steel-plastic composite pipe connection device, including a metal layer, and the inner and outer sides of the metal layer are composited with a plastic pipe layer to form a first steel-plastic composite pipe together, the inner circumference of the first steel-plastic composite pipe is welded to the second electric hot-melt pipe fitting through a second electric heating wire, the axial end face of the first steel-plastic composite pipe is matched with a first plastic convex ring, the first plastic convex ring and the outer circumference of the first steel-plastic composite pipe are welded to the first electric hot-melt pipe fitting through the first electric heating wire, the first electric heating wire is installed on the inner wall of the first electric hot-melt pipe fitting, and the second electric heating wire is installed on the outer wall of the second electric hot-melt pipe fitting; the first steel-plastic composite pipe, the second electric hot-melt pipe fitting, the first electric hot-melt pipe fitting, and the first plastic convex ring surround each other to form a closed cavity, and the closed cavity is finally filled with the first plastic convex ring under the heating action of the first electric heating wire, and the exposed axial end face of the metal layer is sealed. The utility model prevents water seepage and rot by forming a closed cavity relative to the metal layer on the inner and outer sides and end faces of the first steel-plastic composite pipe, and further improves the anti-rust effect by partially melting and filling the closed cavity with the first plastic convex ring. The metal layer is generally made of steel or iron wire.

[0008] The first plastic convex ring and the second electric hot-melt pipe are integrally formed, and the outer diameter of the first plastic convex ring is the same as the outer diameter of the first steel-plastic composite pipe, ensuring the stability of the welding during the hot-melt process and the connection sealing performance between the components.

[0009] The first electric hot-melt pipe fitting has one axial end welded to the first steel-plastic composite pipe, and the other axial end welded to the second steel-plastic composite pipe, thereby forming a two-way connection technical performance.

[0010] The inner circumference of the second steel-plastic composite pipe is welded to the third electric hot-melt pipe fitting through the third electric heating wire, the axial end face of the second steel-plastic composite pipe is matched with a second plastic convex ring, the second plastic convex ring and the outer circumference of the second steel-plastic composite pipe are welded to the first electric hot-melt pipe fitting through the fourth electric heating wire, the third electric heating wire is installed on the outer wall of the third electric hot-melt pipe fitting, and the fourth electric heating wire is installed on the inner wall of the first electric hot-melt pipe fitting, thereby realizing the rust-proof function of the inner metal layer of the second steel-plastic composite pipe.

[0011] The first inner wall of the second electric hot-melt pipe is provided with a protruding first connecting column, which is connected to the second heating wire on the outer wall of the second electric hot-melt pipe to achieve hot-melt connection between the second electric hot-melt pipe and the first steel-plastic composite pipe connected thereto.

[0012] The second inner wall of the third electric hot-melt pipe is provided with a raised second connecting column, which is connected to the third heating wire on the outer wall of the third electric hot-melt pipe to achieve hot-melt connection between the third electric hot-melt pipe and the second steel-plastic composite pipe connected thereto.

[0013] By adopting the above-mentioned technical scheme, the steel-plastic composite pipe connection device prevents water vapor from contacting the metal layer by melting electric hot-melt pipe fittings on both sides of the inner and outer sides of the steel-plastic composite pipe through electric heating wires, and further adopts a plastic convex ring to seal the axial end face of the steel-plastic composite pipe through welding to prevent the exposed axial end face of the metal layer from rusting. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] FIG1 is a schematic diagram of a three-dimensional installation structure of a steel-plastic composite pipe in a steel-plastic composite pipe connection device of the utility model;

[0016] FIG2 is a schematic diagram of the structure of the third electric hot-melt pipe fitting in the present utility model;

[0017] FIG3 is a schematic diagram of the installation structure of the third electric hot-melt pipe fitting and the first electric hot-melt pipe fitting in the utility model;

[0018] Figure 4 is a schematic diagram of the third electric hot-melt pipe and the fourth electric heating wire connection structure of the utility model;

[0019] FIG5 is a schematic diagram of the structure of the second electric hot-melt pipe fitting in the present utility model;

[0020] FIG. 6 is a schematic diagram of the connection structure between the second electric hot-melt pipe fitting and the first electric heating wire in the present invention. DETAILED DESCRIPTION

[0021] The following is a clear and complete description of the technical solutions in the embodiments of the utility model in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of the utility model.

[0022] like Figure 1-6As shown, a steel-plastic composite pipe connection device, the utility model provides a steel-plastic composite pipe connection device, including a metal layer 15, the inner and outer sides of the metal layer 15 are composited with plastic pipe layers to form a first steel-plastic composite pipe 3, the inner circumference of the first steel-plastic composite pipe 3 is welded to the second electric hot-melt pipe fitting 13 through a second electric heating wire 14, the axial end face of the first steel-plastic composite pipe 3 is matched with a first plastic convex ring 16, the first plastic convex ring 16 and the outer circumference of the first steel-plastic composite pipe 3 are welded to the first electric hot-melt pipe fitting 2 through a first electric heating wire 17, the first electric heating wire 17 is installed on the inner wall of the first electric hot-melt pipe fitting 2, and the second electric heating wire 14 is installed on the outer wall of the second electric hot-melt pipe fitting 13; the first steel-plastic composite pipe 3, the second electric hot-melt pipe fitting 13, the first electric hot-melt pipe fitting 2, and the first plastic convex ring 16 surround each other to form a closed cavity, and the closed cavity is finally filled with the first plastic convex ring 16 under the heating action of the first electric heating wire 17 to seal the exposed axial end face of the metal layer 15.

[0023] Preferably, the first plastic convex ring 16 and the second electric hot-melt pipe fitting 13 are integrally formed, and the outer diameter of the first plastic convex ring 16 is the same as the outer diameter of the first steel-plastic composite pipe 3 to improve the welding performance of the first plastic convex ring 16 and the steel-plastic composite pipe 3, and jointly melt-seal the axial end face of the exposed metal layer 15.

[0024] In order to realize the bidirectional connection, one axial end of the first electric hot-melt pipe fitting 2 is welded to the first steel-plastic composite pipe 3, and the other end is welded to the second steel-plastic composite pipe 1. The inner circumference of the second steel-plastic composite pipe 1 is welded to the third electric hot-melt pipe fitting 6 through the third electric heating wire 10, and the axial end face of the second steel-plastic composite pipe 1 is matched with a second plastic convex ring 7, and the second plastic convex ring 7 and the outer circumference of the second steel-plastic composite pipe 1 are welded to the first electric hot-melt pipe fitting 2 through the fourth electric heating wire 12, and the third electric heating wire 10 is installed on the outer wall of the third electric hot-melt pipe fitting 6, and the fourth electric heating wire 12 is installed on the inner wall of the first electric hot-melt pipe fitting 2.

[0025] In order to further improve the hot-melt effect, the first inner wall 5 of the second electric hot-melt pipe fitting 13 is provided with a protruding first connecting column 4, and the first connecting column 4 is connected to the second electric heating wire 14 of the outer wall of the second electric hot-melt pipe fitting 13. The second inner wall 9 of the third electric hot-melt pipe fitting 6 is provided with a protruding second connecting column 8, and the second connecting column 8 is connected to the third electric heating wire 10 of the outer wall of the third electric hot-melt pipe fitting 6.

[0026] Although the embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and cannot be understood as limiting the present invention. Those skilled in the art can change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and purpose of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A steel-plastic composite pipe connection device, comprising a metal layer (15), wherein both inner and outer sides of the metal layer (15) are composited with plastic pipe layers to form a first steel-plastic composite pipe (3), characterized in that: The inner circumference of the first steel-plastic composite pipe (3) is welded to the second electric hot-melt pipe fitting (13) via a second electric heating wire (14); the axial end surface of the first steel-plastic composite pipe (3) is matched with a first plastic convex ring (16); the first plastic convex ring (16) and the outer circumference of the first steel-plastic composite pipe (3) are welded to the first electric hot-melt pipe fitting (2) via a first electric heating wire (17); the first electric heating wire (17) is installed on the inner wall of the first electric hot-melt pipe fitting (2); and the second electric heating wire (14) is installed on the outer wall of the second electric hot-melt pipe fitting (13).

2. The steel-plastic composite pipe connection device according to claim 1, characterized in that: The first plastic convex ring (16) and the second electric hot-melt pipe member (13) are integrally formed, and the outer diameter of the first plastic convex ring (16) is the same as the outer diameter of the first steel-plastic composite pipe (3).

3. The steel-plastic composite pipe connection device according to claim 1, characterized in that: One axial end of the first electric hot-melt pipe fitting (2) is welded to the first steel-plastic composite pipe (3), and the other axial end is welded to the second steel-plastic composite pipe (1).

4. The steel-plastic composite pipe connection device according to claim 3, characterized in that: The inner circumference of the second steel-plastic composite pipe (1) is welded to the third electric hot-melt pipe fitting (6) via a third electric heating wire (10); the axial end face of the second steel-plastic composite pipe (1) is matched with a second plastic convex ring (7); the second plastic convex ring (7) and the outer circumference of the second steel-plastic composite pipe (1) are welded to the first electric hot-melt pipe fitting (2) via a fourth electric heating wire (12); the third electric heating wire (10) is installed on the outer wall of the third electric hot-melt pipe fitting (6), and the fourth electric heating wire (12) is installed on the inner wall of the first electric hot-melt pipe fitting (2).

5. The steel-plastic composite pipe connection device according to claim 1, characterized in that: The first inner wall (5) of the second electric hot-melt pipe (13) is provided with a protruding first connecting column (4), and the first connecting column (4) is connected to the second heating wire (14) of the outer wall of the second electric hot-melt pipe (13).

6. The steel-plastic composite pipe connection device according to claim 4, characterized in that: The second inner wall (9) of the third electric hot-melt pipe (6) is provided with a protruding second connecting column (8), and the second connecting column (8) is connected to the third heating wire (10) on the outer wall of the third electric hot-melt pipe (6).

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