Medium-high frequency electromagnetic induction heating fusion steel-plastic composite pipe connecting unit

Abstract

The invention discloses a medium-high frequency electromagnetic induction heating fusion steel-plastic composite pipe connecting unit. The connecting unit comprises a composite pipe, a waterproof fastening component, a steel-plastic composite pipe sleeve and a tubular plastic connecting piece, wherein the composite pipe comprises a non-magnetic or weak magnetic metal layer and a plastic layer; at least one end of the tubular plastic connecting piece is provided with an annular joint which is adaptively inserted into the end of the composite pipe, and when the composite pipe is inserted into the annular joint, the steel-plastic composite pipe sleeve is arranged between the composite pipe and a side wall of the annular joint; a high-magnetic metal ring is pre-embedded in a side wall of the steel-plastic composite pipe sleeve; and the waterproof fastening component is sleeved at a joint of the composite pipe and the tubular plastic connecting piece. By the connecting unit, because the composite pipe comprises the non-magnetic or weak magnetic metal layer, the electromagnetic induction fusion connecting possibility of the composite pipe which takes the non-magnetic or weak magnetic metal layer as an enhancement layer is provided in the scheme.

Description

technical field [0001] The invention relates to the field of steel-plastic composite pipe fittings, in particular to a middle-high frequency electromagnetic induction heating fusion steel-plastic composite pipe connection kit. Background technique [0002] In the prior art, for plastic-metal composite pipes formed by extrusion molding of thermoplastics, mechanical connection and hot-melt connection are generally used for the installation of pipe fittings. An effective and reliable method of hot-melt connection is electromagnetic induction welding , that is, first insert the composite tube containing the magnetic metal layer into the receiving end of the thermoplastic connector, and use the electromagnetic induction device to make the magnetic metal layer of the composite tube controllably heat and melt the receiving end of the thermoplastic connector, so that indirectly Heating the plastic makes it melt and melt into one, so as to achieve the purpose of hot-melt connection o...

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Problems solved by technology

[0003] But it should be noted that the current metal materials mainly used in composite pipes include: steel (iron), aluminum, aluminum alloy, and stainless steel. In addition to steel (iron) with good magnetic permeability, aluminum and aluminum alloys are often used for water supply The 304 stainless steel used for the purpose is a low magnetic permeability material, which does not respond or has a weak response to electromagnetic induction, so it is impossible to use medium and high frequency induction heating technology to heat aluminum, aluminum alloy and 304 stainless steel and other non-magnetic or weak magnetic permeability metals. Big

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