Hot melt spigot-and-socket special pipe fittings for metallic plastic-lining pipe

Abstract

The invention discloses a special thermal-fusion socket fitting for a metal lining plastic pipeline, which comprises a pipe body, wherein, at least one end of the pipe body is provided with a lengthening section which is integrated with the pipe body, the length of the lengthening section is more than or equal to the expansion extension amount of a lining plastic pipeline in a metal lining plasticpipeline under the maximum use temperature difference. When the invention is used, a thin section formed by the expansion and extension of the lining plastic pipeline caused by heat expansion is naturally placed into the fitting, so the lengthening section of the fitting makes a strength compensation to the expanded and extended lining plastic pipeline section to form the pressure-resistant intensity and the rigidity which are the same as those of the fitting. The expanded and extended section of the lining plastic pipeline is completely in a fitting pressure-bearing structural system, and visible thin sections of the lining plastic pipelines can not appear any more at the joints on both ends of the pipeline, which radically solve the system defect of the metal lining plastic pipeline andguarantee the whole application advantage of the metal lining plastic pipeline system.

Description

technical field [0001] The invention relates to a pipe connection pipe fitting used in a water supply or heating system, in particular to a pipe fitting specially used for hot-melt socket of a metal-lined plastic pipe. Background technique [0002] At present, the types of water supply and heating piping systems mainly include metal pipes, plastic pipes and metal-lined plastic pipes. Among them, metal pipes are rarely used because each connection point is threaded, which is prone to dripping, leaking, running, and popping during use. The plastic pipe is connected by hot-melt socket, and the adjacent pipes have been welded into one, which basically avoids the phenomenon of dripping, leaking, running, and popping at the connection point, and has strong corrosion resistance. When the rigidity is poor, so the use occasions are subject to certain restrictions. The metal-lined plastic pipe is formed by drawing and compounding aluminum alloy or other metal pipes on the surface of...

AI Technical Summary

Problems solved by technology

As a result, when the temperature changes and thermal expansion and contraction occur, at both ends of the metal-lined plastic composite pipe, that is, at the connection between the pipe and the pipe fittings, a section of the lined plastic pipe will expand and elongate and be exposed outside the metal pipe. It cannot be completely wrapped and covered

In terms of the structural strength and compressive strength of the entire piping system, the elongated exposed plastic-lined piping forms the weakest segment of the metal-lined plastic composite piping system (see figure 1 ), in this weak section 10 most prone to leaks, and even pipe burst accidents

As a result, the rigidity and compressive strength of the metal-lined plastic composite piping system are also reduced to the level of the plastic-lined piping system. The advantages of the overall structural rigidity and compressive strength of the metal piping system will no longer exist, and it will become a metal-plastic-lined piping system. sexual defect

[0005] Therefore, the use of existing thermoplastic pipe fittings for hot-melt socket connection of metal composite pipes has structural defects, which cannot guarantee the overall performance advantages of the metal-lined plastic pipe system

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