Electromagnetic induction double-hot-melting pipe fitting for steel-plastic composite pressure

Abstract

The utility model relates to the technical field of double-hot-melting pipe fittings, in particular to a steel-plastic composite pressure electromagnetic induction double-hot-melting pipe fitting which comprises an inner pipe, a flame-retardant pipe is arranged on the outer wall of the inner pipe, welding end columns are arranged at the two ends of the outer wall of the flame-retardant pipe, and a convex ring is arranged on the outer wall of the flame-retardant pipe and located between the two welding end columns. A connecting groove is formed in the middle of the outer end of each welding end column, a metal plate is arranged in each interlayer, and a wear-resistant sleeve is arranged between the outer walls of the two welding end columns in a sleeving mode; according to the electromagnetic induction double-hot-melting pipe fitting for steel-plastic composite pressure, the flame-retardant pipe with the convex ring and the inner pipe with the reinforcing pipe are combined and fixed, so that the damage influence on the inner pipe during electromagnetic induction hot melting is reduced, the toughness and impact resistance of the inner pipe are improved under the cooperation of the reinforcing pipe, and the influence on conveying caused by deformation of the inner pipe is reduced; through the arrangement of the connecting grooves, rapid hot melting of the outer sides of the metal plates can be achieved during electromagnetic induction heating, stable insertion of external connecting pipes is facilitated under the cooperation of the connecting grooves, and the connection tightness is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of double heat-melting pipe fittings, specifically a steel-plastic composite pressure electromagnetic induction double heat-melting pipe fitting. Background Technology

[0002] Steel-plastic composite pressure electromagnetic induction double hot melt pipe fittings are a new type of pipe material that uses argon arc butt welded galvanized steel pipe as the middle layer and polypropylene that is resistant to high temperature, high pressure and low temperature impact as the inner and outer layers. It is made by synchronously controlling the composite process using imported high temperature resistant special hot melt adhesive. It is a new type of green and environmentally friendly pipe material that combines the advantages of steel pipe and plastic pipe.

[0003] The utility model with announcement number CN219159814U discloses an electromagnetic induction welding type double hot melt pipe fitting with a metal elastic bushing, including at least one plastic welding end, which includes an inner ring and an outer ring. The inner ring is a spigot and the outer ring is a socket. A socket for inserting steel-plastic composite pipe is formed between the spigot and the socket. A metal elastic bushing with outward expansion elasticity is provided on the inner wall of the spigot.

[0004] The above technical solution, by using a spacer to insert into the bushing opening, can completely separate the two free parts on both sides of the bushing opening, preventing them from being squeezed, pressed, or even superimposed by the expansion force generated during the heating of the plastic in the socket. This avoids the metal elastic bushing from overheating between the two free parts of the bushing opening due to the proximity effect of electromagnetic induction during electromagnetic induction heating. However, when installing and assembling double heat-fusion fittings, it is not convenient to perform stable heat-fusion bonding at the two ends, and the outer wall of the fitting does not have flame-retardant properties. This reduces the risk of heat deformation damage in the middle of the pipe during double-end heat-fusion connection, affecting the pipeline's transport performance. Furthermore, the outer wall of the fitting is subject to prolonged friction and contact with external objects, causing damage to the outer wall and affecting long-term use. Utility Model Content

[0005] The purpose of this utility model is to provide a steel-plastic composite pressure electromagnetic induction double heat-melting pipe fitting to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A steel-plastic composite pressure electromagnetic induction double heat-fusion pipe fitting includes an inner tube, a flame-retardant tube on the outer wall of the inner tube, welding end posts at both ends of the outer wall of the flame-retardant tube, a protruding ring on the outer wall of the flame-retardant tube between the two welding end posts, a connecting groove in the middle of the outer end of the welding end post, a hollow area between the inner and outer walls of the welding end post forming a sandwich layer, a metal plate in each sandwich layer, and a wear-resistant sleeve fitted between the outer walls of the two welding end posts.

[0008] Preferably, the inner tube is made of random copolymer polypropylene, and the hollow area between the inner wall and the outer wall of the inner tube is a mounting groove, in which a reinforcing tube is provided.

[0009] In this invention, the random copolymer polypropylene material increases the corrosion resistance of the inner wall of the inner tube, and the reinforcing tube increases the structural toughness of the inner tube, increases its compressive strength, and reduces deformation caused by external extrusion, which would affect the internal transport and coordination of the inner tube.

[0010] Preferably, the width of the inner wall of the mounting groove is adapted to the width of the outer wall of the reinforcing tube, and the reinforcing tube is made of a material combining steel cord and polyethylene.

[0011] In this invention, the combination of steel cord and polyethylene increases structural toughness, thereby increasing compressive strength and impact resistance, while also reducing deformation that affects the overall appearance of the inner tube.

[0012] Preferably, the outer diameter of the inner tube is adapted to the inner diameter of the flame-retardant tube, the convex ring and the flame-retardant tube are integrally formed, and the flame-retardant tube is made of rigid PVC material.

[0013] In this invention, the flame-retardant tube is made of polyvinyl chloride, which reduces the damage to the inner tube when the welding end posts are heat-fused.

[0014] Preferably, the inner diameter of the inner ring of the fusion end post is adapted to the outer diameter of the flame-retardant tube, and the inner ring of the fusion end post is bonded and fixed to the outer wall of the flame-retardant tube.

[0015] In this invention, the welded end post and the flame-retardant tube are bonded together to increase the tightness of the assembly and thus increase the stability of the overall assembly connection.

[0016] Preferably, the width of the inner wall of the interlayer is adapted to the width of the outer wall of the metal plate, and the metal plate is tightly bonded and fixed to the welding end post.

[0017] In this invention, with the cooperation of a metal plate, an alternating magnetic field is generated by an induction coil through an alternating current. This alternating magnetic field induces eddy currents inside the metal plate. As these eddy currents flow within the metal plate, they generate heat due to resistance, thus heating the metal plate and causing it to heat up. This melts the material on both sides of the metal plate, achieving a corresponding thermoplastic fit. External connecting pipes are inserted into the connecting grooves to increase the tightness of the installation.

[0018] Preferably, the two opposing ends of the welding end posts are tightly fitted to the end of the convex ring, the inner diameter of the wear-resistant sleeve is adapted to the outer diameter of the welding end posts, and the wear-resistant sleeve is sequentially bonded and fixed to the convex ring and the welding end posts.

[0019] In this invention, the wear-resistant sleeve protects the outer layer, reducing prolonged contact between the outer wall and external objects, thus minimizing frictional wear and damage to the outer layer, and extending the overall service life.

[0020] Compared with the prior art, the beneficial effects of this utility model are:

[0021] 1. This utility model combines a flame-retardant tube with a convex ring and an inner tube with a reinforcing tube for fixation, which reduces the damage to the inner tube during electromagnetic induction heating. The reinforcing tube also increases the toughness and impact resistance of the inner tube, reducing the impact of inner tube deformation on transportation. The metal plate in the welding end column helps to achieve rapid heating of the outer side of the metal plate during electromagnetic induction heating. With the help of the connecting groove, it helps to stably insert the external connecting tube and increase the tightness of the connection.

[0022] 2. This utility model increases the flame-retardant effect between the two hot-melt end posts by setting a convex ring, reducing the impact of damage to the middle of the inner tube, and with the cooperation of the wear-resistant sleeve, protects the overall outer ring, reducing long-term contact with external objects, friction damage to the outer ring, and shortening the overall service life. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0024] Figure 2 This is a schematic diagram of the structure for removing the wear-resistant sleeve according to this utility model;

[0025] Figure 3 This is a schematic diagram of the cross-sectional structure of the welded end post of this utility model;

[0026] Figure 4 This is a schematic cross-sectional view of the inner tube portion of this utility model.

[0027] Figure 5 This is a schematic diagram of the overall cross-sectional structure of this utility model.

[0028] The meanings of the labels in the diagram are as follows:

[0029] 1. Inner tube; 10. Mounting groove; 100. Reinforcing tube;

[0030] 2. Flame-retardant tubing; 20. Convex ring;

[0031] 3. Welded end post; 30. Connecting groove; 31. Interlayer; 310. Metal plate;

[0032] 4. Wear-resistant sleeve. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] Please see Figures 1-5 This embodiment provides a technical solution:

[0035] A steel-plastic composite pressure electromagnetic induction double heat-melting pipe fitting includes an inner tube 1, which is made of random copolymer polypropylene. The hollow area between the inner wall and the outer wall of the inner tube 1 is a mounting groove 10, and a reinforcing tube 100 is provided in the mounting groove 10.

[0036] In this invention, the random copolymer polypropylene material increases the corrosion resistance of the inner wall of the inner tube 1, and the reinforcing tube 100 increases the structural toughness of the inner tube 1, increases its compressive strength, and reduces deformation caused by external extrusion, which affects the internal conveying and coordination of the inner tube 1.

[0037] Furthermore, the width of the inner wall of the mounting groove 10 is adapted to the width of the outer wall of the reinforcing tube 100, and the reinforcing tube 100 is made of a material combining steel cord and polyethylene.

[0038] In this invention, the combination of steel cord and polyethylene increases structural toughness, thereby increasing compressive strength and impact resistance, while also reducing the impact of deformation on the overall appearance of the inner tube 1.

[0039] Specifically, the outer wall of the inner tube 1 is provided with a flame-retardant tube 2. The outer diameter of the inner tube 1 is matched with the inner diameter of the flame-retardant tube 2. The convex ring 20 and the flame-retardant tube 2 are integrally formed. The flame-retardant tube 2 is made of rigid PVC material.

[0040] In this invention, the flame-retardant tube 2 is made of polyvinyl chloride, which reduces the damage to the inner tube 1 when the welding end post 3 is heat-fused.

[0041] It should be noted that both ends of the outer wall of the flame-retardant tube 2 are provided with welding end posts 3. The inner diameter of the inner ring of the welding end post 3 is adapted to the outer diameter of the flame-retardant tube 2, and the inner ring of the welding end post 3 is bonded and fixed to the outer wall of the flame-retardant tube 2.

[0042] In this invention, the welding end post 3 and the flame-retardant tube 2 are bonded together to increase the tightness of the assembly and thus increase the stability of the overall assembly connection.

[0043] It should be noted that a protruding ring 20 is provided on the outer wall of the flame-retardant tube 2 between the two welding end posts 3, and a connecting groove 30 is opened in the middle of the outer end of the welding end post 3. The hollow area between the inner wall and the outer wall of the welding end post 3 is a sandwich layer 31. Each sandwich layer 31 is provided with a metal plate 310. The width of the inner wall of the sandwich layer 31 is adapted to the width of the outer wall of the metal plate 310. The metal plate 310 is tightly bonded and fixed to the welding end post 3.

[0044] In this invention, with the cooperation of the metal plate 310, an alternating magnetic field is generated by an alternating current passing through an induction coil. This alternating magnetic field induces eddy currents inside the metal plate 310. As these eddy currents flow within the metal plate 310, they generate heat due to resistance, thus heating the metal plate 310 and melting the material on both sides of the metal plate 310, achieving a corresponding thermoplastic fit. The external connecting pipe is correspondingly inserted into the connecting groove 30, increasing the tightness of the installation.

[0045] Furthermore, a wear-resistant sleeve 4 is fitted between the outer walls of the two welded end posts 3. The opposite ends of the two welded end posts 3 are tightly fitted to the end of the convex ring 20. The inner diameter of the wear-resistant sleeve 4 is adapted to the outer diameter of the welded end post 3. The wear-resistant sleeve 4 is bonded and fixed to the convex ring 20 and the welded end post 3 in sequence.

[0046] In this invention, the wear-resistant sleeve 4 is installed to protect the outer layer, reducing the long-term contact between the overall outer wall and external objects, and preventing frictional wear from damaging the outer layer, thereby extending the overall service life.

[0047] In this embodiment, when using the steel-plastic composite pressure electromagnetic induction double hot melt pipe fitting, firstly, the flame-retardant pipe 2 with the convex ring 20 is bonded and combined with the inner pipe 1 with the reinforcing pipe 100. Then, the welding end post 3 with the metal plate 310 is bonded to both ends of the outer wall of the flame-retardant pipe 2. Finally, the wear-resistant sleeve 4 is fitted between the two welding end posts 3.

[0048] When it is necessary to weld with an external connecting pipe, the corresponding electromagnetic induction heating component is brought close to the welding end post 3 that needs to be heated. An alternating magnetic field is generated by the alternating current passing through the induction coil. The alternating magnetic field induces eddy currents inside the metal plate 310. When the eddy currents flow in the metal plate 310, they generate heat due to resistance, thereby heating the metal plate 310 and melting the material on both sides of the metal plate 310. The external connecting pipe is inserted into the connecting groove 30 to achieve the corresponding hot melt bonding. With the cooperation of the wear-resistant sleeve 4, the impact of contact friction of external objects on the outer ring wear is reduced. With the cooperation of the flame-retardant tube 2, the heat transfer during hot melting is reduced, which causes damage to the inner tube 1. With the cooperation of the reinforcing tube 100, the overall resistance to extrusion deformation is increased, the impact resistance is increased, and the liquid transport inside the inner tube 1 is not affected.

Claims

1. A steel-plastic composite electromagnetic induction double hot-melt pipe fitting for pressure, comprising an inner pipe (1), characterized in that: The inner tube (1) is provided with a fire-retardant tube (2) on the outer wall, both ends of the outer wall of the fire-retardant tube (2) are provided with a fusion end column (3), a convex ring (20) is arranged between the two fusion end columns (3) on the outer wall of the fire-retardant tube (2), a connecting groove (30) is formed in the middle of the outer end of the fusion end column (3), the hollow area between the inner wall and the outer wall of the fusion end column (3) is a sandwich layer (31), and the sandwich layer (31) is provided with a metal plate (310).

2. The steel-plastic composite pressure electromagnetic induction double hot-melt pipe fitting according to claim 1, characterized in that: The inner tube (1) is made of random copolymer polypropylene material, the hollow area between the inner wall and the outer wall of the inner tube (1) is an installation groove (10), and the installation groove (10) is provided with a reinforcing tube (100).

3. The steel-plastic composite pressure electromagnetic induction double hot-melt pipe fitting according to claim 2, characterized in that: The width of the inner wall of the installation groove (10) is matched with the width of the outer wall of the reinforcing tube (100), and the reinforcing tube (100) is made of a material combined with steel cord and polyethylene.

4. The steel-plastic composite pressure electromagnetic induction double hot-melt pipe fitting according to claim 1, characterized in that: The outer diameter of the inner tube (1) is matched with the inner diameter of the fire-retardant tube (2), the convex ring (20) and the fire-retardant tube (2) are an integral molding structure, and the fire-retardant tube (2) is made of hard PVC material.

5. The steel-plastic composite pressure electromagnetic induction double hot-melt pipe fitting according to claim 1, characterized in that: The inner diameter of the inner ring of the fusion end column (3) is matched with the outer diameter of the fire-retardant tube (2), and the inner ring of the fusion end column (3) is adhesively fixed with the outer wall of the fire-retardant tube (2).

6. The steel-plastic composite pressure electromagnetic induction double hot-melt pipe fitting according to claim 1, characterized in that: The width of the inner wall of the sandwich layer (31) is matched with the width of the outer wall of the metal plate (310), and the metal plate (310) is adhesively fixed with the fusion end column (3).

7. The steel-plastic composite pressure electromagnetic induction double hot-melt pipe according to claim 1, characterized in that: The end of each of the two fusion end columns (3) opposite to each other is tightly combined with the end of the convex ring (20), the inner diameter of the wear-resistant sleeve (4) is matched with the outer diameter of the fusion end column (3), and the wear-resistant sleeve (4) is adhesively fixed with the convex ring (20) and the fusion end column (3) in sequence.

Images