CN1186921A

CN1186921A - Metal composite pipe and making method and pipe joint structure

Info

Publication number: CN1186921A
Application number: CN96123012A
Authority: CN
Inventors: 俞家正
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-12-30
Filing date: 1996-12-30
Publication date: 1998-07-08

Abstract

The composite pipe uses steel pipe as basic material, the corrosion resisting thin wall liner pipe is fitted on the inner surface of the steel pipe. The making method firstly makes the thin wall liner pipe be rolled into special pipe, to reduce the pipe diameter, then inserted in the steel pipe. A pulling extrusion die is put in one end of the liner pipe to do the axial expanding extrusion action and make the liner pipe be fitted on the inner surface of the steel pipe. The structure of the joint of the metal composite pipe firstly nests the corrosion resistant thin sleeve on the end of the pipe, then it is screw jointed directly on the pipe joint. Thus the invented product features low cost, good result for corrsoion resistance, long service life, simple for installation and wide range of application.

Description

Metal composite pipe and making method and pipe joint structure

What the present invention relates to is a kind of method and pipe joint structure that two kinds of metal tubes is linked in together and tube fluid is had the composite pipe of corrosion-resisting function and makes this composite pipe.

As everyone knows, the pipeline that conveyance fluid is used adopts two kinds of plastic tube and metal tubes basically, because plastic pipe intensity is low, is subjected to easily carrying the erosion of liquid and reduces working life, the narrow limitation of application area is bigger, thereby the actual metal tube that uses is more than plastic tube.Metal tube is based on the employing Coating Steel Pipe, but because the given shape of this Coating Steel Pipe makes the inner surface of pipeline zinc coat coarse loose, and Corrosion Protection is very poor, the loss of head is also bigger.Though the corrosion protection pipeline that also has is the internal surface at steel pipe to be coated with and to be shaped on one deck corrosion resistant coating.But owing to all be coated with the bigger of last layer corrosion resistant coating at the internal surface of whole pipe, the uniformity that coats can't guarantee, the coating that has also comes off easily, therefore the working life of the corrosion protection pipeline that makes of this method not long yet, anticorrosion ability is not good yet.Adopted at present abroad metal tubes such as Stainless Steel Tube, copper pipe to be used as the conveyance conduit of liquid, but the costing an arm and a leg of these metallic material, construction is complicated, has promoted the use of certain difficulty in China.

The objective of the invention is in order to overcome the deficiency of above-mentioned existence, be linked in together corrosion-resistant composite pipe, a kind of method of this composite pipe and structure that this composite pipe connects made by two kinds of metal pipes and provide a kind of.

The objective of the invention is to finish by following technical solution, as base material, on the inwall of this steel pipe, be fitted with a corrosion-resistant thin-walled bushing pipe with steel tube.

Steel tube of the present invention is a pipe, scribbles heatproof glue between the inwall of this steel pipe and the bushing pipe coating surface, selects the stainless steel thin-wall bushing pipe to be inserted in and to be fitted on the inwall of steel pipe and constitutes metal composite pipe.

For solving the corrosion-resistant problem of metal composite pipe pipe end, when connecting into pipeline, adopt following pipe joint structure, it is after being nested with the corrosion-resistant slim sleeve pipe of a circle on the perisporium of the end of composite pipe, directly is screwed on the pipe joint.

Making above-mentioned metal composite pipe is to adopt distortion diameter reducing process earlier, the method that the back is pushed with axial hole enlargement, it is corrosion resistant thin-walled bushing pipe to be rolled into axially to have at least the shape of leading of two place's indents to manage earlier, the reduced diameter that makes pipe is to putting into the steel pipe, be inserted in then in the parent tube steel pipe, one special-purpose pultrusion mould is placed in thin-walled bushing pipe one end axially relatively moves, and make on its inwall that fits in the steel pipe after squeezing the thin-walled bushing pipe by expanding.

The present invention is coated with on the recess axial position in described special pipe and is brushed with high-temperature plastic, port at this special pipe draws the chamber of leading the way that a bell mouth shape is arranged, the one spherical pultrusion mould that is connected with pull bar is placed in the other end from the chamber of leading the way of special pipe to pipe and relatively moves and finish axial hole enlargement extrusion process, internal lining pipe is fitted on the internal surface of parent tube.

Description of drawings is as follows:

Fig. 1 is the radially schematic representation of thin-walled bushing pipe necking deformation of the present invention.

Fig. 2 is the axial hole enlargement extrusion structure of a present invention schematic representation.

Fig. 3 is the schematic representation of pipe joint structure of the present invention.

The present invention will be described in detail below in conjunction with accompanying drawing: the present invention selects that price is lower, steel pipe with certain intensity is as parent tube, the pipe that selection thin-wall stainless steel or copper pipe or other corrosion resistant metal are made is as bushing pipe 2, and the wall thickness of general bushing pipe 2 is between 0.05mm-0.5mm.Fig. 1 is rolled into the special pipe that three place's indents are axially arranged with corrosion resistant thin-walled bushing pipe 2 earlier, make the reduced diameter 2-3mm of internal lining pipe 2 make it to put into steel pipe 1, on 2 three interior recess axial positions of internal lining pipe, be coated with and be brushed with high-temperature plastic 8, be inserted in then in the steel pipe 1.Fig. 2, above-mentioned produce special pipe in, one port of special pipe is drawn the chamber 3 of leading the way that a bell mouth shape is arranged, the one spherical pultrusion mould 5 that is connected with pull bar 4 is placed in the above-mentioned chamber 3 of leading the way, power by the outside relatively moves to the other end of pipe by pull bar 4 drive pultrusion moulds 5, special pipe is finished axial hole enlargement extrusion process, internal lining pipe 2 is fitted on the internal surface of steel circle pipe 1.

When above-mentioned composite pipe is formed by connecting pipeline as conveyance fluid, connect with pipe joint 6 often, suffer erosion owing to directly contacting with tube fluid at connection end steel circle pipe 1, therefore the present invention is nested with slim stainless steel sleeve 7 backs in external pipe thread spinning in pipe joint 6 on the end face of composite pipe, and also available other corrosion-resistant metal materials of described slim stainless steel sleeve pipe 7 replace.At the pipe joint engaging piece; slim stainless steel sleeve 7 is close to and is combined between pipe joint 6 and the composite pipe; fluid can't infiltrate; and along pipe end one section slim stainless steel sleeve 7 is inwardly arranged at the internal surface of composite pipe; and form the labyrinth with the internal surface of composite pipe; fluid also is difficult to penetrate into the end of pipe, thereby plays the effect of corrosion-resistant protection.

The present invention is as the line transportation fluid time, its necessary mechanical strength, compression resistance, bear required intensity such as fluid mass and bear by the lower steel pipe of price, and what directly contact with fluid is corrosion resistant thin-walled bushing pipe, thereby it not only price is lower, and corrosion resistance is effective, long service life, installation is simple, applied widely, preparation process is simple, is the good material of a kind of alternative stainless steel, copper or other high-grade anticorrosion pipeline.

Claims

1, a kind of with the metal composite pipe of steel pipe as base material, it is characterized in that being fitted with a corrosion-resistant thin-walled bushing pipe (2) on the inwall of described steel pipe (1).

2, metal composite pipe as claimed in claim 1, it is characterized in that described steel pipe (1) is a pipe, between the inwall of steel pipe (1) and bushing pipe (2) coating surface, scribble heatproof glue (8), described bushing pipe (2) is the stainless steel thin-wall bushing pipe, and it is inserted in and is fitted on the inwall of steel pipe (1) and constitutes metal composite pipe.

3, a kind of pipe joint structure of metal composite pipe after it is characterized in that being nested with a corrosion-resistant slim sleeve pipe of circle (7) on the end perisporium of composite pipe, directly is screwed on the pipe joint (6).

4, a kind of making method of metal composite pipe, it is characterized in that earlier corrosion resistant thin-walled bushing pipe (2) being rolled into the special pipe that axially has two place's indents at least, the reduced diameter that makes pipe is to putting into steel pipe (1), be inserted in then in the steel pipe (1), one special-purpose pultrusion mould (5) is placed on axially relatively moves in thin-walled bushing pipe (2) one ends, and after expanding crowded bushing pipe (2), make on its inwall that fits in steel pipe (1).

5, the making method of metal composite pipe as claimed in claim 4, after it is characterized in that described thin-walled bushing pipe (2) is made into special pipe, be coated with on the recess axial position within it and be brushed with high-temperature plastic (8), port at this special pipe draws the chamber of leading the way (3) that a bell mouth shape is arranged, the interior the other end to pipe in the chamber of leading the way (3) that the one spherical pultrusion mould (5) that is connected with pull bar (4) is placed on special pipe relatively moves, finish beam barrel hole enlargement extruding, internal lining pipe (2) is fitted in the process of steel pipe (1) internal surface.