CN200972037Y

CN200972037Y - Steel pipe conversion joint for underground gas pipeline

Info

Publication number: CN200972037Y
Application number: CN 200620111793
Authority: CN
Inventors: 周伟
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-11-27
Filing date: 2006-11-27
Publication date: 2007-11-07
Anticipated expiration: 2016-11-27

Abstract

The utility model relates to a pipe joint of ground gas pipe in the gas network, in particular to a joint of the ground gas pipe from steel to plastic, comprising a seamless pipe and a ground gas PE pipe. One end of the seamless pipe is provided with a pipe taper thread which is inserted into or guided into one end of the ground gas PE pipe to achieve the tight sliding fit; at the section of the tight sliding fit, the inner face of the ground gas PE pipe is tabled with the groove of the pipe taper thread and a thermal shrinkable sleeve is externally arranged on the joint of the stainless pipe and the ground gas PE pipe. The utility model has a great pressure proof, great sealing effect without leaking gas, reliable security and good noncorrosibility. The utility model also has the advantages of easiness in manufacture, low in cost and is suitable for mass produce. Moreover, the utility model is convenient to install and has a life span lasting for 30 years and is free in repair.

Description

The underground gas pipeline steel is moulded crossover sub

One, technical field

The utility model relates in the gas ductwork, and the steel that is connected between the pipe joint that connects between the underground gas pipe, particularly underground gas steel pipe and underground gas PE pipe is moulded crossover sub.

Two, background technique

In the underground pipe network of domestic city pipeline gas industry and the pipe network on the ground, because steel pipe and cast iron tube price are higher, tubing is heavier relatively, and it is outer to need coating antiseptic again, and not only the management operating maintenance cost is higher, and lacks (generally at 25-35) service life.Therefore in the combustion gas underground pipe network, a kind of corrosion-inhibiting coating that do not need, density is little, installs simple and easyly, and the underground gas PE that grows (more than 50 years) service life manages (combustion gas buried polyethylene fuel tube) and is used.But because underground gas PE manages not ultraviolet radiation preventing, so underground gas PE pipe network goes out before the ground or need steel to mould crossover sub when being connected with steel pipe in underground pipe network.The present steel that adopts is moulded crossover sub and is made of steel pipe, PE pipe, special fixed steelring, the PE pipe exerted pressure by press be pressed in the steel pipe of band cover tooth pipe, again with special fixed steelring hoop on the PE of joint pipe, cause the joint PE tube wall of this crossover sub thin, withstand voltage poor, safety reliability is low, fixed steelring easy-to-rust, antiseptic property are poor, need carry out preservative treatment, manufacturing procedure is many, the cost of production height.

Three, summary of the invention

The purpose of this utility model is to overcome the deficiencies in the prior art, provide a kind of withstand voltage good, connect good seal, underground gas pipeline steel safe and reliable, that antiseptic property is strong, manufacturing procedure is simple, cost of production is low is moulded crossover sub.

The utility model adopts such technological scheme: a kind of underground gas pipeline steel is moulded crossover sub, include seamless steel pipe, underground gas PE pipe, an end that it is characterized in that seamless steel pipe is provided with the pipe tapered thread, the pipe tapered thread end of seamless steel pipe inserts or imports the interior interference fit of an end of underground gas PE pipe, the pipe tapered thread groove of the internal surface of underground gas PE pipe and seamless steel pipe is chimeric in this interference fit section, and is arranged with the PE thermal shrinkable sleeve outside the joint of seamless steel pipe and underground gas PE pipe.

It is that steel is moulded linkage structure that the underground gas pipeline steel that provides by the utility model is moulded crossover sub, its two ends during use (the other end of seamless steel pipe and underground gas PE pipe), respectively with the combustion gas underground pipe network in seamless steel pipe welding and adopt the special-purpose Placement of PE pipe and PE in the combustion gas underground pipe network to manage to be connected.Because the seamless steel pipe in this crossover sub and the joint of underground gas PE pipe are interference fit, the internal surface of the underground gas PE pipe of joint and the pipe tapered thread groove of seamless steel pipe are chimeric, realize the integral sealing of two kinds of interface tube sections, and be arranged with the PE thermal shrinkable sleeve outside the joint.The utility model is moulded crossover sub for the full corrosion-resistant steel of mechanism, can prevent effectively that the joint is corroded and gas leakage and joint come off, so withstand voltage good, connect good seal do not leak combustion gas, safe and reliable, antiseptic property is strong, and manufacturing procedure is simple, can reduce production costs, be suitable for factory and produce in batches, on-the-spot easy for installation, be working life more than 30 years, and freedom from repairs.The utility model can also be applicable to that the steel of tap water (feedwater) pipe network moulds transition and conversion and connect.

Four, description of drawings

Accompanying drawing is a structural representation of the present utility model.

Among the figure: 1-seamless steel pipe 2-PE thermal shrinkable sleeve 3-underground gas PE pipe

Five, embodiment

Embodiment of the present utility model is described with reference to the accompanying drawings.As shown in drawings, a kind of underground gas pipeline steel is moulded crossover sub, include seamless steel pipe 1, underground gas PE pipe 3, seamless steel pipe 1 is one section tubing that specification is φ 34 * 4, the preprocessing of one end has the pipe tapered thread of one section certain-length, underground gas PE pipe 3 is one section tubing that specification is φ 40 * 3.7, the pipe tapered thread end of seamless steel pipe 1 inserts or imports in the end of underground gas PE pipe 3, the interference fit that keeps 70 millimeters long, with special heating plant this interference fit section is heated, make seamless steel pipe 1 temperature of interference fit section rise to the degree that can melt the PE pipe internal surface, the polyethylene that the internal surface of underground gas PE pipe 3 is molten is filled the pipe tapered thread groove and the seamless steel pipe end face of seamless steel pipe 1 automatically, the internal surface of the underground gas PE of interference fit section pipe 3 is chimeric with the pipe tapered thread groove of seamless steel pipe 1, and outside seamless steel pipe 1 and underground gas PE manage 3 joint sheathed PE thermal shrinkable sleeve 2.

Claims

1, a kind of underground gas pipeline steel is moulded crossover sub, include seamless steel pipe (1), underground gas PE manages (3), an end that it is characterized in that seamless steel pipe (1) is provided with the pipe tapered thread, the pipe tapered thread end of seamless steel pipe (1) inserts or imports the interior interference fit of an end of underground gas PE pipe (3), the pipe tapered thread groove of the internal surface of underground gas PE pipe (3) and seamless steel pipe (1) is chimeric in this interference fit section, and is arranged with PE thermal shrinkable sleeve (2) outside the joint of seamless steel pipe (1) and underground gas PE pipe (3).