Pipe joint used for connecting polyethylene plastic-steel winding pipes

Abstract

A pipe joint used for connecting polyethylene plastic-steel winding pipes includes a spiral pipe body, and is characterized by further including a spigot sleeve and a socket sleeve respectively fixed on outer sides at two ends of the spiral tube body, wherein the spigot sleeve comprises a first spiral tube and a first direct tube; the inner side of the first spiral tube is provided with a spiral slot that is matched with a convex spiral having the same spiral direction with the convex spiral; a first flange boss is arranged between the first spiral tube and the first direct tube, and the first spiral tube is screwed and fixed at one end of the spiral pipe body; the socket sleeve comprises a second spiral tube and a second direct tube; and the outer diameter of the first direct tube is smaller than or equal to the inner diameter of the second direct tube. The spigot sleeve and the socket sleeve provided by the invention can be injection-molded at one step directly by adopting an injection molding machine, so that the pipe joint is extremely convenient, simple and quick to machine and produce, and has the advantages that the use of a special tool is avoided during construction, the cost is low and the compression resistance is high.

Description

technical field [0001] The patent of the invention relates to a pipe joint for polyethylene plastic-steel winding pipes, especially a pipe joint for connecting small-diameter plastic-steel winding pipes (Dn≤800mm). Background technique [0002] Due to the unique structure of the outer spiral rib, the polyethylene plastic-steel winding pipe (industry standard number CJ / T 270-2007) mainly adopts two connection methods, namely, the internal electric hot-melt connection method and the stainless steel clamp connection method. Among them, the internal electric hot melt belt connection method is mainly suitable for pipes with larger diameters (Dn≥800mm, Dn is used to represent the diameter of pipes), among which Dn≥1200mm is mostly used. For the pipes with Dn≤1200mm, especially the pipes with Dn≤800mm, basically all the pipes are connected by stainless steel clamps. [0003] The so-called small-diameter pipes (Dn≤800mm) are connected by stainless steel clamps: firstly, the two end...

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Problems solved by technology

[0004] This connection method has high requirements on the plastic-steel winding pipe trench, and at the same time has high requirements on the climate and site conditions, especially not working with water. The rubber plate expands with water, which makes normal connection impossible. This method uses rubber sleeve + rubber The cost of plate + stainless steel looper is very high, accounting for about 15% of the entire pipe cost

At the same time, due to the frequent collision of pipes during transportation and loading and unloading, the steel strips are exposed at both ends of the pipes, and the pipes need to be repaired on site, which consumes manpower and material resources.

[0005] The Chinese patent No. 201120127241 discloses a quick connector for a steel belt reinforced winding pipe. In the embodiment, a processed spiral corrugated pipe is put on the inner diameter spiral of the pipe, and finally sealed with an adhesive layer. But this method causes the diameter of the pipe to shrink, which affects the diameter and flow of the pipe, especially when there are tolerances in the processing of pipes and pipe fittings, and the tolerance for large-diameter pipes is greater, and the gap between pipes and pipe fittings It will be bigger, so it is difficult to make a sealed connection with polyurethane glue

At the same time, in the connection joint of this structure, due to the limitation of the structure, the joint and the inner wall of the pipe cannot be welded at all, and the sealing cannot be realized, and there are water leakage and seepage phenomena, so it cannot be used in actual engineering.

The existing polyethylene-plastic-steel winding pipe is basically an external spiral, and the inside of the pipe is straight and smooth, so the above-mentioned pipe joint cannot be adapted at all. If this joint is to be used, a special pipe must be prepared to match it. Does not conform to engineering reality at all

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