Socket pipe piece of heat melted connection

Abstract

The present invention discloses a hot-melt connecting spigot-and-socket pipe fitting for aluminium plastics composite pipe. At least one end of said pipe fitting possesses adjacent spigot-and-socket part and internal layer connecting part, the rear portion of said spigot-and-socket part is equipped with an exhaust viewing hole, and the internal and external layer hot-melt connections of said joint are not identical in length, so that said invention can completely solve the exhaust problem produced when the aluminium plastics composite pipe and spigot-and-socket pipe fitting are hot-melt connected.

Description

technical field [0001] The invention relates to the technical field of connecting pipe fittings for aluminum-plastic composite pipes, in particular to a hot-melt connection socket pipe fitting for aluminum-plastic composite pipes. Background technique [0002] There are two methods for the existing aluminum-plastic composite pipe hot-melt fittings. One is the outer layer welding method, that is, the outer layer of the pipe is hot-melt connected with the inner layer of the hot-melt pipe fitting. This connection method is generally used in ordinary plastic When the pipe hot-melt connection is applied to the aluminum-plastic composite pipe, since the aluminum alloy layer at the port of the aluminum-plastic composite pipe is not sealed, it is easy to corrode the aluminum alloy layer when the pipeline transports liquid, resulting in the delamination of the pipe, which greatly reduces the The safety performance of pipeline use. [0003] Another kind is inner and outer layer weldi...

AI Technical Summary

Problems solved by technology

This kind of pipe joint socket has a large hot-melt area and long connection length, that is, the inner and outer ring walls are hot-melted at the same length. The metal bushing increases the manufacturing cost of the pipe fittings. Although this method seals the aluminum alloy layer at the port of the aluminum-plastic composite pipe, it overcomes the problem that the aluminum alloy layer is easily corroded when the pipeline transports liquid, but this pipe fitting The socket connection area of ​​the pipe is large, and the hot-melt length is long. When the pipe is inserted into the socket, a compressed air space in the socket will inevitably be formed. The compressed air in the socket cannot be discharged, thus forming a compressed air space in the socket, which will inevitably cause virtual melting or virtual welding, and it is very easy to generate bubble separation on the hot-melt connection surface, directly reducing the connection strength of the pipe fittings

At the same time, the socket described in the above-mentioned patent technical solution is actually a deep annular blind hole, and it is impossible to observe whether the inserted end of the pipe has reached the bottom of the blind hole during the hot-melt connection, thereby affecting the quality and strength of the hot-melt connection

Images