Improved plastic metal loose joint pipe

Abstract

The invention relates to an improved plastic metal loose joint pipe which comprises a metal connecting element and a plastic element containing a metal insert, wherein one end of the plastic element is movably connected with the metal connecting element; the outer edge of a pipe opening of the plastic element is provided with a first flange; one end of the metal connecting element is provided with a second flange which is protruded to an inner hole; and the outer diameter of the first flange is smaller than the inner diameter of the metal connecting element and larger than the inner diameter of the second flange. The metal insert is arranged outside one end of the plastic element which is connected with the metal connecting element; and one end of the metal insert is embedded into a plastic body, and the other end of the metal insert is outwards flared according to the shape of the first flange. The matching of the metal insert and an injection mold can solve the problem of material overflow caused in the time when the plastic element is injected and moulded. After the improved plastic metal loose joint pipe is connected to a pipeline system, the liquid in a pipe can not touch the metal insert, and the seepage from the combined surface of the metal insert and the plastic element and the corrosion of the metal insert are prevented; meanwhile, the metal insert can also reinforce the strength of the plastic element and the connecting strength of the plastic element and the metal connecting element.

Description

Technical field: [0001] The invention relates to connecting pipes, in particular to joint pipe joints, in particular to an improved plastic-metal joint pipe. Background technique: [0002] Plastic products with metal inserts are widely used, especially pipe fitting products. Since plastic pipe fittings generally do not allow direct threading, threaded metal parts must be used in plastic pipe fittings where threaded connections are required. In the prior art, the metal insert will be in contact with the fluid in the pipeline, and there will inevitably be a joint line between the metal insert and the plastic material in the pipeline (that is, the opening of the joint surface), so that the fluid directly contacts the metal insert for a long time, which may Corrosion and fouling of metal inserts will result. At the same time, long-term alternating use of cold and heat may cause leakage of the joint surface between metal inserts and plastic bodies. Invention content: [0003]...

AI Technical Summary

Problems solved by technology

In the prior art, the metal insert will be in contact with the fluid in the pipeline, and there will inevitably be a joint line between the metal insert and the plastic material in the pipeline (that is, the opening of the joint surface), so that the fluid directly contacts the metal insert for a long time, which may Corrosion and fouling of metal inserts. At the same time, long-term alternating use of cold and heat may cause leakage of the joint surface between metal inserts and plastic bodies

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