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Pipeline electric fusing joint adopting tenon-and-mortise structure and electric fusing welding method

An electrofusion joint and electrofusion welding technology, applied in the direction of pipeline connection layout, pipe/pipe joint/pipe fittings, mechanical equipment, etc., can solve the problems of short circuit of resistance wire and stress concentration, to prevent excessive welding pressure and avoid stress The effect of concentration and good structural continuity

Inactive Publication Date: 2012-08-22
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the defect that the length of the inner cooling welding zone may cause stress concentration or short circuit of the resistance wire in the prior art, and provide a pipeline electrofusion joint and an electrofusion welding method using a mortise and tenon structure

Method used

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  • Pipeline electric fusing joint adopting tenon-and-mortise structure and electric fusing welding method
  • Pipeline electric fusing joint adopting tenon-and-mortise structure and electric fusing welding method
  • Pipeline electric fusing joint adopting tenon-and-mortise structure and electric fusing welding method

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specific Embodiment 1

[0032] 1. The wiring process of the electrofusion sleeve:

[0033] The main points of embedded resistance wire laying are as follows: 1) Length requirements: Let the wall thickness of the pipe be e, the length of the outer cold welding zone 1 is Lw≥0.8e; the length of the fusion zone 3 is Lr≥e+5mm; The cold welding zone is merged into the middle cold welding zone 4, and the length Ln≥2e. 2) Wiring density: the embedding distance dn of the resistance wires in the middle cold welding zone is greater than the embedding distance dr of the resistance wires in the fusion zone, which can be 1.2dr≤dn≤3dr.

[0034] 2. Process grooves and protrusions at the end of the pipe

[0035] The protrusion height 9 is 0.3e-1e; the protrusion width 11≤0.4e; the outer thickness of the protrusion ≥0.3e. Groove depth 7 is greater than or equal to the height of the protrusion, less than or equal to the height of the protrusion + 0.1e; groove width 6 is greater than or equal to the width of the protr...

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Abstract

The invention relates to the field of plastic pipelines or plastic composite pipeline welding and aims to provide a pipeline electric fusing joint adopting a tenon-and-mortise structure and an electric fusing welding method. The pipeline electric fusing joint comprises two opposite pipeline end heads respectively connected to two sections of pipes; the end surface of one pipeline end head is provided with an annular protruded part, while the end surface of the other pipeline end head is provided with an annular groove; the protruded part is matched with the size and the shape of the groove; and when the protruded part enters the groove, the two end surfaces are tightly adhered. The welding method is mainly characterized in that a resistance wire is embedded in a middle cold welding area of an electric fusing sleeve. In the invention, through using a plastic pipe or a composite pipe manufactured by using the pipeline electric fusing joint and the welding method, the interior of the electric fusing joint does not have a non-fused area, and compared with a traditional electric fusing joint, the pipeline electric fusing joint has better structural continuity and better mechanical property; and the condition that stress concentration is generated due to the existence of the cold welding area in the sleeve under the action of internal pressure, which causes that a crack runs throughthe sleeve, and the sleeve loses efficacy, can be avoided.

Description

technical field [0001] The invention belongs to the field of plastic pipe or plastic composite pipe welding, and in particular relates to a pipe electric fusion joint adopting a mortise and tenon structure and an electric fusion welding method. Background technique [0002] Electrofusion welding is widely used to join plastic and plastic composite pipes, such as polyethylene pipes, steel wire wound composite pipes, etc. Electrofusion welding has the advantages that the welding process is less disturbed by human factors, the strength of the joint is greater than that of the pipe, and the welding quality is stable and reliable. In order to improve the welding quality of electrofusion joints and ensure that the electrofusion joints can meet the requirements of the design life of the pipeline, a considerable number of domestic and foreign technical personnel have standardized or improved the structure, process, operation method, and equipment accessories of the electrofusion joi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16L47/02F16L47/03
Inventor 徐平施建峰师俊饶静郑津洋
Owner ZHEJIANG UNIV
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