CN1621725A

CN1621725A - Metal-plastic composite cold/hot water pipe and manufacturing method thereof

Info

Publication number: CN1621725A
Application number: CN 200310108902
Authority: CN
Inventors: 李西海; 顾忠康; 梁俊豪
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-11-27
Filing date: 2003-11-27
Publication date: 2005-06-01

Abstract

The composite cold and hot water metal-plastic pipe has outer layer of decorative stainless steel pipe with high corrosion resistance and inner layer of modified linear high pressure polyethylene pipe with excellent temperature performance, no freeze cracking at -50 deg.c, no softening at 95 deg.c and no pollution to water. The composite cold and hot water metal-plastic pipe is manufactured through cold drawing and diameter reducing to make the inner wall of outer metal pipe and the outer wall of inner plastic pipe contact tightly. The making process has no gluing step and is simple in operation, low in cost and high in compounding effect.

Description

Compound cool and hot water pipe of a kind of metallo-plastic and manufacture method thereof

Technical field:

The present invention relates to a kind of composite metal-plastic pipe and manufacture method thereof, be specifically related to subzero 50 ℃ of not bursting by freezing of severe cold, 95 ℃ of softening, nontoxic compound cool and hot water pipe of metallo-plastic of health of high temperature, its manufacture method system cold-drawn undergauge fabrication techniques.

Background technique:

Galvanized iron conduit is poor because of corrosion resistance, produces reasons such as secondary pollution in the use, be under an embargo as the domestic water supply pipeline, and reasons such as common plastics tube is low because of intensity, load resistant power is poor, freeze proof heat resistance deficiency has narrow limitation in the use.For with advantage and the high advantages of metal tube intensity such as plastic tube corrosion resistance and good, composite metal-plastic pipe has appearred on the market, its making method is shown in Chinese patent ZL01203574.1 steel-plastic composite pipe, be that the plastic tube that outer surface scribbles heat sealing adhesive is pierced in the metal tube, is one by heat-fusing glue layer with inner wall of metal tube and plastic tube outer wall adhesion, but coating is difficult to accomplish evenly, and during coating curing, often shrinks and cause tackiness agent not bonding.

Summary of the invention:

The purpose of this invention is to provide a kind of inner wall of metal tube and plastic tube outer wall and closely paste and be integral, be fit to that extremely frigid zones uses, the nontoxic compound cool and hot water pipe of metallo-plastic of health, and provide a kind of easy and simple to handle, cost is low, inner wall of metal tube and plastic tube outer wall are fitted good manufacture method.

The technological scheme that adopts for achieving the above object is: the compound cool and hot water pipe of a kind of metallo-plastic, to form by metal tube and the plastic tube that is built in the metal tube, and the outer wall of inner wall of metal tube and plastic tube fits tightly.Described metal tube is a thin-wall stainless steel, and described plastic tube is commercially available modification linear low density polyethylene pipe.

The manufacture method of the compound cool and hot water pipe of this metallo-plastic is: the surface of metal tube is carried out plucking earlier and is handled, the internal diameter of metal tube is slightly larger than the external diameter 1～1.5mm of plastic tube, plastic tube is inserted in the metal tube, the external diameter of metal tube is greater than the aperture 1.5mm of cold drawing die center nib, tup is made in a termination that is built-in with the metal tube of plastic tube to be handled, the center nib of cold drawing die can be passed in pipe termination after tup is handled, clamp the pipe termination of tightly stretching out nib with mechanical clamp, under the traction of drawing dolly, the compound cool and hot water pipe of metallo-plastic is by the nib of cold drawing die, because the nib internal diameter is less than the metal tube external diameter, extruding fits tightly inner wall of metal tube and plastic tube outer wall.

The invention has the beneficial effects as follows: the outer tube stainless steel, good corrosion resistance, ornamental strong, the commercially available modification linear low density polyethylene of interior pipe has excellent freeze proof heat resistance, subzero 50 ℃ of not bursting by freezing of severe cold, 95 ℃ high temperature is not softening, health is nontoxic, do not produce water pollution once again, meet the food sanitation requirement, and easy for installation.The present invention has reduced manufacturing mechanism, has simplified operation with the glue bond that is coated with between cold-drawn undergauge technology alternative metals pipe and plastic tube, and low cost of manufacture, composite effect are good.

Description of drawings:

Fig. 1, the compound cool and hot water pipe structural representation of metallo-plastic;

Fig. 2, cold drawing die shape figure;

Fig. 3, the A-A sectional view of Fig. 2.

Among the figure, 1, metal tube; 2, plastic tube; 3, cold drawing die; 4, nib.

Embodiment:

The invention will be further described below in conjunction with drawings and Examples.Fig. 1 shows the compound cool and hot water pipe structure of a kind of metallo-plastic, is provided with plastic tube 2 in the metal tube 1, and the outer wall of the inwall of metal tube 1 and plastic tube 2 fits tightly.Described metal tube is a thin-wall stainless steel, and described plastic tube 2 is commercially available modification linear low density polyethylene pipe.

Manufacture method of the present invention is: metal tube 1 surface is carried out plucking earlier and is handled, the internal diameter of metal tube 1 is slightly larger than the external diameter 1～1.5mm of plastic tube 2, plastic tube 2 is inserted in the metal tube 1 movingly, the external diameter of metal tube 1 is greater than the about 1.5mm of bore of cold drawing die 3 center nibs 4, tup is made in a termination that is built-in with the metal tube 1 of plastic tube 2 to be handled, the center nib 4 of cold drawing die 3 can be passed in pipe termination after tup is handled, clamp the pipe termination of tightly stretching out nib 4 with mechanical clamp, under the traction of drawing dolly, the compound cool and hot water pipe of metallo-plastic is by nib 4, under the squeezing action of cold drawing die 3, the bore of metal tube 1 shrinks, and the outer wall of the inwall of metal tube 1 and plastic tube 2 fits tightly.

The material of metal tube 1 is copper or other metallic material also.

The material of plastic tube 2 can require to select suitable engineering plastics for use according to use occasion, as superhigh molecular weight polyethylene pipe.

Claims

1, the compound cool and hot water pipe of a kind of metallo-plastic, by metal tube (1) with place the plastic tube (2) in the metal tube (1) to form, it is characterized in that: metal tube (1) inwall and plastic tube (2) outer wall fit tightly.

2, the compound cool and hot water pipe of metallo-plastic according to claim 1 is characterized in that: described metal tube (1) is a Stainless Steel Tube, and described plastic tube (2) is a modification linear low density polyethylene pipe.

3, a kind of method of making the described composite metal-plastic pipe of claim 1, it is characterized in that: metal tube (1) surface is carried out plucking earlier and is handled, the internal diameter of metal tube (1) is slightly larger than the external diameter 1～1.5mm of plastic tube (2), plastic tube (2) is inserted in the metal tube (1), the external diameter of metal tube (1) is greater than the about 1.5mm in aperture of cold drawing die (3) center nib (4), the tup processing is done in a termination that will be built-in with the metal tube (1) of plastic tube (2), the nib (4) of cold drawing die (3) can be passed in pipe termination after tup is handled, clamp the pipe termination of tightly stretching out nib (4) with mechanical clamp, under the traction of drawing dolly, the compound cool and hot water pipe of metallo-plastic is by nib (4), under the squeezing action of cold drawing die (3), the bore of metal tube (1) shrinks, and the outer wall of metal tube (1) inwall and plastic tube (2) is fitted tightly.