High-seal seamless hot-melt sleeve and its production method and application method

A seamless thermal and high-sealing technology, applied in the direction of pipes/pipe joints/fittings, pipe connection layout, damage protection, etc., can solve problems such as gaps at lap joints, insufficient thermal fusion of longitudinal seams, and insufficient welding , to achieve the effect of reducing the incidence of pipeline accidents, tight hot-melt connection and prolonging the service life

Active Publication Date: 2018-08-17
河北汇东管道股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The heat-shrinkable sheet method is to bake the heat-shrinkable sleeve or sheet by flame, so that it is heated and shrunk and bonded to the outer polyethylene protective layer of the pipe. Using this method, the quality of on-site jointing is not easy to guarantee, and the strength of the jointing is low.
[0004] The hot-melt method is to use a clamp to press the sealing sheet (polyethylene sheet) and the polyethylene protective layer on the outer layer of the pipeline, and then use electric heating wire heating to weld the sealing sheet and the polyethylene protective layer together. The joint piece surrounds the directly buried insulation pipe, and a longitudinal seam will be formed at both ends of the joint piece at the joint. Since the longitudinal seam needs to be melted before foaming, there is no supporting ring between the joint piece and the pipe. Space, although there is a tightening belt at this place during hot melting, because there is no support in the inner cavity, the longitudinal seam is not tightly melted, and gaps are prone to appear at the overlapping joints, while the overlapping joints of the ring seams are closed in the tight belt After tightening, the upper and lower electric melting nets are easily bonded and short-circuited, resulting in overheating, resulting in insufficient welding of the rest; at the same time, due to the lack of shrinkage of the patch, the end of the insulation pipe shrinks, and the expansion and contraction performance of the rigid clamp used for compression And poor, affecting the sealing performance of the interface
[0005] The plastic welding method is to use plastic welding rods to weld the joint piece and the outer polyethylene protective layer of the pipe together. This method is greatly affected by the weather during construction, and the welding quality is not easy to guarantee. At the same time, due to the small sintering area, the strength of the welding part Much lower than the hot melt method

Method used

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  • High-seal seamless hot-melt sleeve and its production method and application method
  • High-seal seamless hot-melt sleeve and its production method and application method
  • High-seal seamless hot-melt sleeve and its production method and application method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Such as figure 1 As shown, the high-seal seamless hot-melt sleeve of the present invention includes: a PE short pipe 1 and an electric heat-melt net 2, the electric heat-melt net 2 is embedded on the inner walls of the two ports of the PE short pipe 1 by extrusion, The length of the net 2 embedded in the PE short pipe 1 from the edge of the port is 30-300mm. The method of embedding the electrothermal fusion net is the extrusion embedding method. The material of the electrothermal fusion net is composed of nickel alloy resistance wire. The force used for extrusion is related to the specification of the PE short pipe 1. The inner diameter (DN) of the PE short pipe 1: 100 ≤DN4 -2×10 4 N, 500≤DN4 -5×10 4 N, 1000≤DN4 -10 5 N (DN is the nominal inner diameter in mm).

Embodiment 2

[0030] Such as figure 2 As shown, the difference between this embodiment and Embodiment 1 is that the high-seal seamless hot-melt sleeve also includes: a hard sleeve 3, which is tubular and covered at the edges of both ends of the PE short pipe 1, , the nozzle at the other end is provided with a guide crack 31, and the tube body of the hard sleeve 3 is a corrugated structure 32.

[0031] The inner diameter of the hard set is greater than the outer diameter of the PE short pipe 1 by 20±5mm, and the height of the corrugated structure 32 on the tube body of the hard set is greater than 40±5mm when it shrinks. The hard set 3 is made of a metal alloy material, such as aluminum Alloy or zinc alloy, etc., hard kit 3 and PE nozzle are bonded together by adhesive, the bonding method is point bonding, and 3 points or 4 points are set at intervals on the outer layer of the nozzle of PE short pipe 1 position, apply adhesive, the total coating area is 1-2cm 2 , the adhesion force is 20-...

Embodiment 3

[0033] The specific manufacturing steps for preparing the high-seal seamless hot-melt sleeve in Example 1 of the present invention are as follows: select the PE short pipe 1 with the same diameter and wall thickness as the direct-buried pipe outer layer PE pipe to expand the pipe, and directly bury the outer layer of the thermal insulation pipe The pipe is a PE pipe, the middle layer is an insulation layer, the inner layer is a working pipe, and the length of the PE short pipe 1 is 500-1000mm. Pipe expansion by cold expansion process: PE short pipe 1 enters from the small end of the different diameter pipe mold, the large end of the different diameter pipe mold is 10mm larger than the inner diameter of PE short pipe 1, and the PE short pipe 1 is made by pressing the press The big end of the reducing pipe mold passes through, the pressure setting range of the press is related to the specification of the PE short pipe 1, the inner diameter (DN) of the PE short pipe 1: 100≤DN4 -5×...

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Abstract

The invention relates to the technical field of pipelines, in particular to a high-sealing seamless hot-melt sleeve, and a manufacturing method and application method thereof. The high-sealing seamless hot-melt sleeve comprises a PE short pipe and an electric hot-melt net. The edges of the two ends of the PE short pipe can be provided with hard sleeve parts. The PE short pipe presses the electric hot-melt net onto the pipe wall of a PE pipe after being subjected to pipe expanding. The hard sleeve parts can be bonded to the outer layers of ports of the PE pipe. When the high-sealing seamless hot-melt sleeve is in use, the outer-layer PE pipe of a heat insulating pipe can be sleeved with the PE short pipe; after completion of welding of two sections of working pipes, the PE short pipe is slid to a joint; an overlapped part is heated through a heating band or flames and is made to automatically shrink, and is clamped by using a fixture; and after the PE short pipe and the outer-layer PE pipe of the directly-buried heat insulating pipe are hot-melted into a whole, the fixture is dismantled after the overlapping part naturally cools. The high-sealing seamless hot-melt sleeve provided by the invention has no weld joint to be welded and is higher in sealing strength, more anticorrosive and more durable. The service life of the directly-buried heat insulating pipe is prolonged. The safety performance of the directly-buried heat insulating pipe is improved.

Description

technical field [0001] The invention relates to the technical field of pipelines, in particular to a high-tightness seamless hot-melt sleeve, a manufacturing method and a using method thereof. Background technique [0002] At present, since the protection, insulation and anti-corrosion layer of the main body of the direct-buried thermal insulation pipeline are prefabricated by special equipment in the factory, the quality of the protective layer and thermal insulation and anti-corrosion is relatively reliable. The quality of the mouth (that is, the interface between the outer polyethylene plastic pipes), at present, there are three methods for filling the outer polyethylene protective layer of direct buried pipelines: heat shrinkable sheet method, hot melt method and plastic welding method. [0003] The heat-shrinkable sheet method is to bake the heat-shrinkable sleeve or sheet by flame, so that it is heated and shrunk and bonded to the outer polyethylene protective layer of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16L47/02F16L58/18B29C69/00B29C65/64B29C65/48B29C57/04
CPCB29C57/04B29C65/48B29C65/64B29C69/00F16L47/02F16L58/181
Inventor 王志玲
Owner 河北汇东管道股份有限公司
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