CN204187150U - Socket joint jointing type plastic lining steel-plastic composite pipe - Google Patents

Abstract

The utility model is a socket-connected plastic-lined steel-plastic composite pipe, which includes an equal-diameter steel pipe, and is characterized in that it also includes a socket steel pipe, one end of the equal-diameter steel pipe is welded and fixedly connected to the socket steel pipe, and the other end is connected to the horn The small end of the shaped socket is welded and fixed, and the plastic liner is compositely fixed with the steel pipe of equal diameter fixedly connected with the socket steel pipe and the horn-shaped socket. The connection structure is: the socket steel pipe of the front steel-plastic composite pipe is in sealing contact with the horn-shaped socket lining pipe of the rear steel-plastic composite pipe, and the sealing ring arranged on it is in contact with the horn-shaped socket of the rear steel-plastic composite pipe. Liner sealing contact. Due to the use of socket and socket socket, cone sealing and double sealing ring sealing connection, it has the advantages of simple structure, high sealing reliability, quick installation, convenient maintenance and disassembly, and long service life.

Description

Socket connection type plastic-lined steel-plastic composite pipe

technical field

The utility model relates to the field of pipelines, which is a socket-connected plastic-lined steel-plastic composite pipe.

Background technique

Pipeline transportation is a long-distance transport method of transporting liquid and gas materials using pipelines as a means of transportation. Transportation has the advantages of less energy consumption, low cost and good benefits. The pipe is the main component of the pipeline. According to the material, there are several types of pipes, such as steel pipes, cast iron pipes, reinforced concrete pipes, and non-metallic pipes. The connection methods include socket connections, flange connections, welding, and bonding. The socket connections are pipes. The connection method is convenient, fast, safe and efficient. Since the socket connection pipe belongs to the different diameter pipe, in the pipes of the prior art, it is only used on cast iron pipes and reinforced concrete pipes. For steel pipes, flanges are usually used Connect or solder.

Steel-plastic composite pipe is a new generation of chemical building material pipes. Compared with traditional metal pipes or plastic pipes, it has incomparable advantages in terms of mechanical properties, chemical properties, and comprehensive cost performance. The development and production of the steel-plastic composite pipe production line has good economic and social benefits. At present, the steel-plastic composite pipes produced in China have a diameter of ≤φ200mm and a length of ≤7m. The connection method is usually welding. The welding method is a non-detachable structure. The two pipes are not well connected, and the welding is not good, especially the bottom welding is very difficult. There may be air leakage and water phenomenon, and maintenance is inconvenient; there are also flange connections, but the service life is low and the seal is not reliable.

Utility model content

The technical problem to be solved by the utility model is: to overcome the shortcomings of the prior art, to provide a socket connection type lined plastic steel-plastic composite pipe with simple structure, high sealing reliability, quick installation, convenient maintenance and disassembly, and long service life ,

The solution of the utility model to solve the technical problem is: a socket-connected plastic-lined steel-plastic composite pipe, which includes equal-diameter steel pipes, and is characterized in that it also includes socket steel pipes, trumpet-shaped sockets and plastic inner pipes. One end of the equal-diameter steel pipe is welded and fixed to the spigot steel pipe, and the other end is welded and fixed to the small end of the trumpet-shaped socket. And form the conical flanging of the socket at the edge of the mouth of the socket steel pipe.

The connection structure between the adjacent front steel-plastic composite pipe and the rear steel-plastic composite pipe is: the spigot steel pipe of the front steel-plastic composite pipe passes through the socket tapered flange formed on the plastic lining pipe and the rear steel-plastic composite pipe. The trumpet-shaped socket of the composite pipe is in sealing contact with the tapered part of the plastic liner pipe, and the socket steel pipe of the front steel-plastic composite pipe passes through the second sealing ring, the first sealing ring and the trumpet-shaped bearing of the rear steel-plastic composite pipe. Composite plastic liner pipe sealing contact.

The socket-connected plastic-lined steel-plastic composite pipe can also be covered with an insulation layer. Its structure is: it includes an outer protection pipe and a foam insulation layer. Outside the equal-diameter steel pipe of the shaped socket, a foam insulation layer is arranged between them.

The equal-diameter steel pipe is a spiral welded steel pipe.

The plastic lining pipe is a polyethylene lining pipe.

The outer protective tube is a PE outer protective tube.

The diameter of the equal-diameter steel pipe is φ75㎜～φ3000㎜, and the length is 7m～12m.

The socket-connection-lined plastic-steel-plastic composite pipe of the utility model has the advantages of simple structure, high sealing reliability, fast installation, and convenient maintenance and disassembly due to the use of socket and socket socket, cone seal and double seal ring seal connection mode. , long service life and other advantages.

Description of drawings

Fig. 1 is the structural schematic diagram of socket connection type lining plastic steel-plastic composite pipe of the present invention;

Fig. 2 is a partially enlarged schematic diagram of Fig. 1;

Fig. 3 is a schematic diagram of the connection structure of the socket connection type lined plastic-steel-plastic composite pipe of the present invention;

Fig. 4 is a structural schematic diagram of a socket connection type lined plastic-steel-plastic composite pipe of the present invention with an outer coating insulation layer;

Fig. 5 is a schematic diagram of the connection structure of the socket-connection-lined plastic-steel-plastic composite pipe of the present invention with an outer insulation layer.

In the figure: 1 trumpet-shaped socket, 2 polyethylene lined pipe, 3 equal-diameter steel pipe, 4 socket steel pipe, 5 socket tapered flange, 6 front steel-plastic composite pipe, 7 second sealing ring, 8 first sealing ring , 9 rear steel-plastic composite pipe, 10 outer protection pipe, 11 insulation layer.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

Embodiment 1, with reference to Figures 1 to 3, Embodiment 1 is a φ500×12000 socket-connected polyethylene-lined steel-plastic composite pipe, which includes equal-diameter steel pipes 3, socket steel pipes 4, and trumpet-shaped sockets 1 and polyethylene lining pipe 2, the equal-diameter steel pipe 3 is a spiral welded steel pipe, one end of the equal-diameter steel pipe 3 is welded and fixed to the socket steel pipe 4, and the other end is welded and fixed to the small end of the trumpet-shaped socket 1, and the polyethylene The liner pipe 2 is compounded and fixedly connected with the equal-diameter steel pipe 3 fixedly connected with the socket steel pipe 4 and the trumpet-shaped socket 1, and a socket tapered flange 5 is formed on the mouth edge of the socket steel pipe 4 . The connecting structure between the adjacent front steel-plastic composite pipe 6 and the rear steel-plastic composite pipe 9 is: the spigot steel pipe 4 of the front steel-plastic composite pipe 6 passes through the socket taper formed on the polyethylene liner 2. The flanging 5 is in sealing contact with the tapered part of the polyethylene liner pipe 2 compounded with the trumpet-shaped socket 1 of the rear steel-plastic composite pipe 9, and the socket steel pipe 4 of the front steel-plastic composite pipe 6 passes through the second sealing ring 7, The first sealing ring 8 is in sealing contact with the polyethylene liner 2 compounded with the trumpet-shaped socket 1 of the rear steel-plastic composite pipe 9 , and the embodiment described is manufactured using the prior art.

Embodiment 2, referring to Figures 1 to 5, Embodiment 2 is a φ500×12000 socket-connected polyethylene-lined steel-plastic composite pipe. The embodiment 2 is basically the same as the embodiment 1, except that It has an outer covering insulation layer, and its structure is: it includes an outer protection pipe 10 and an insulation layer 11, and the outer protection pipe 10 is sleeved outside the equal-diameter steel pipe 3 fixedly connected with the socket steel pipe 4 and the trumpet-shaped socket 1. An insulating layer 11 is arranged between, and the described embodiment adopts prior art to manufacture.

The beneficial effects of the utility model are: also have the following advantages:

1. Excellent mechanical strength: high strength, rigidity, impact resistance, stable pressure bearing performance; mechanical properties: tensile strength 275-320MPa, 7-8 times that of pure plastic pipes;

2. Thermal conductivity: thermal conductivity 0.46~0.57W/m.k, about 1/100 of steel pipe, close to the thermal conductivity of plastic pipe;

3. Small expansion coefficient: similar to the creep resistance of steel pipes, buried pipes can withstand greater external pressure; the linear expansion coefficient is 1.2×10-5/°C, which is 1/10 to 1/12 of pure plastic pipes ;

4. Hydraulic performance: The inner wall roughness of the socket-connected plastic-lined steel-plastic composite pipe is 0.007mm, and the inner wall is smooth. When transporting fluid, the resistance loss is small and there is no scaling. The structure integrates rigidity and flexibility, which can quickly eliminate the pipeline The pressure shock in the system does not produce water hammer noise. The pipe wall is smooth, the flow resistance is small, and there is no scaling. Under the same pipe diameter and pressure, the water head loss is 30% lower than that of metal pipes;

5. Corrosion resistance: It can be installed without any anti-corrosion treatment, which saves engineering costs. The inner and outer polyethylene of the steel-plastic composite pressure pipe is a non-polar material with very stable chemical properties. Known solvents, able to resist the corrosion of various acids, alkalis and salt solutions;

6. Hygienic performance: The steel-plastic composite pressure pipe is hygienic and non-toxic, conforms to the GB/T 17219 standard, and has obtained the "National Product Sanitation License Approval Document Involving Drinking Water Hygienic Safety" by the Jilin Provincial Department of Health, and can be used for direct drinking water transportation;

7. Self-tracking: It can be tracked by magnetic metal detectors, without additional tracking or protection marks, which can avoid excavation damage and provide great convenience for repair and maintenance;

8. Service life: within the normal temperature and pressure range, it can be used for 50 years;

9. Hot-melt connection: The connector for the socket-type lined plastic-steel-plastic composite pipe is a hot-melt connection, which has a higher pressure bearing capacity and anti-corrosion capacity than the pipe, and is easy to install and has good sealing performance;

10. Wide range of temperature adaptation The hot water pipe can be used in the range of -10°C to 90°C;

11. Light weight, easy to transport and store;

12. Non-toxic, non-polluting, truly environmentally friendly tube.

Claims (7)

1. A plastic-steel-plastic composite pipe lined with a socket connection type, which includes equal-diameter steel pipes, is characterized in that: it also includes socket steel pipes, trumpet-shaped sockets and plastic liner pipes, and one end of the equal-diameter steel pipes is connected to the socket The steel pipe is welded and fixed, and the other end is welded and fixed to the small end of the trumpet-shaped socket. The plastic liner is compositely connected to the equal-diameter steel pipe that is fixedly connected to the socket steel pipe and the trumpet-shaped socket, and is formed on the edge of the socket steel pipe. Socket tapered flange. 2. The socket-connected plastic-lined steel-plastic composite pipe according to claim 1, characterized in that: the connection structure between the adjacent front steel-plastic composite pipe and the rear steel-plastic composite pipe is: the The socket steel pipe of the front steel-plastic composite pipe is in sealing contact with the tapered part of the plastic liner pipe compounded with the trumpet-shaped socket of the rear steel-plastic composite pipe through the tapered flange of the socket formed on the plastic liner pipe, and the socket of the front steel-plastic composite pipe The steel pipe is in sealing contact with the plastic lining pipe compounded with the trumpet-shaped socket of the rear steel-plastic composite pipe through the second sealing ring and the first sealing ring arranged on it. 3. The socket-connection-lined plastic-steel-plastic composite pipe as claimed in claim 1, characterized in that: the socket-connection-lined plastic-steel-plastic composite pipe can also be covered with an insulation layer, and its structure is: it It includes an outer protection pipe and an insulation layer, the outer protection pipe is sleeved on the outside of the equal-diameter steel pipe fixedly connected with a socket steel pipe and a trumpet-shaped socket, and an insulation layer is arranged between them. 4. The socket-connected plastic-lined steel-plastic composite pipe as claimed in claim 1, characterized in that: said equal-diameter steel pipe is a spiral welded steel pipe. 5. The socket connection plastic-lined steel-plastic composite pipe according to claim 1, characterized in that: the plastic lined pipe is a polyethylene lined pipe. 6. The socket-connection plastic-lined steel-plastic composite pipe as claimed in claim 3, characterized in that: the outer protective pipe is a PE outer protective pipe. 7. The socket-connected plastic-lined steel-plastic composite pipe according to claim 1, characterized in that: the diameter of the equal-diameter steel pipe is φ75㎜～φ3000㎜, and the length is 7m～12m.