Pipefitting for connecting metal compound tubular product

Abstract

The invention discloses a pipefitting for connecting a metal compound tubular product. The pipefitting comprises a plastic pipefitting body. At least one end of the plastic pipefitting body is a socket hot melting connecting end; the socket hot melting connecting end comprises two layers radially: separately an outer layer pipe and an inner layer pipe; the length of the outer layer pipe is greaterthan the length of the inner layer pipe; the diameter of the outer layer pipe is greater than the diameter of the inner layer pipe; a socketing portion is formed between the outer layer pipe and theinner layer pipe; the socketing portion comprises a first sealing surface, a second sealing surface and a third sealing surface; the first sealing surface is used for being in hot melting connection to a plastic inner layer of the metal compound tubular product, the second sealing surface is in hermetically contact with a metal middle layer of the metal compound tubular product, and the third sealing surface is used for being in hot melting connection to a plastic outer layer of the metal compound tubular product; and a material storage tank is also arranged in the bottom of the socketing portion. The pipefitting disclosed by the invention is low in cost and excellent in sealing property and can solve the problems of air trapping, leakage at the connection of the plastic and the metal andthe like effectively.

Description

technical field [0001] The invention relates to the technical field of pipeline systems, in particular to a pipe fitting for connecting metal composite pipes. Background technique [0002] The existing connection methods of metal-plastic composite pipes usually include locking connection of metal pipe fittings and hot-melt connection of inner and outer layers of plastic pipe fittings. [0003] Among them, the connection cost of metal pipe fittings is high, and the operation is relatively complicated. [0004] The connection efficiency of the inner and outer heat-melt connection of plastic pipe fittings is more time-consuming and push-in resistance than the connection of single-layer pipes. The plastic pipe fittings are further divided into two ends that are socket hot-melt connection ends, one end that is a socket hot-melt connection end, and the other end that is a threaded connection end. [0005] Among them, problems such as trapped air and difficult insertion usually o...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the deficiencies of the prior art, and provide a pipe fitting for connecting metal composite pipes with low cost, excellent sealing performance, which can effectively solve the problems of trapped air, difficult insertion, leakage at the junction of plastic and metal, etc.

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