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Process for producing double-layer wrapped welding tube used for connecting indoor/outdoor units of air conditioner

A double-layer coiled welded pipe and production process technology, applied in the field of manufacturing engineering, can solve the problems of low yield strength and can not replace the connection of copper pipes, etc., and achieve the effects of reducing energy consumption, good deep drawing performance, and achieving uniform deformation.

Inactive Publication Date: 2009-02-25
芜湖源大管业有限公司
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  • Abstract
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the existing double-layer coiled welded pipe cannot replace the copper pipe connected to the indoor / outdoor unit of the air conditioner, and provides a low yield strength, which is convenient for manual bending and forming, has good drawing and forming performance, and is not easy to form. Production process of double-layer coiled welded pipes for connecting indoor and outdoor units of air conditioners that may appear flattened and pipe wall wrinkled

Method used

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  • Process for producing double-layer wrapped welding tube used for connecting indoor/outdoor units of air conditioner

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Embodiment Construction

[0009] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0010] The copper-plated steel strip of double-layer welded pipe produced by the present invention selects ultra-low carbon interstitial atom-free steel [W(C)3 Decompose the protective gas pipeline valve, fill the brazing furnace 3, annealing furnace 4, and cooling pipe 5 with NH 3 Decompose the protective gas; start the production line, adjust the temperature of the brazing furnace 3 to 1084°C and use copper as the brazing material for brazing, and send the brazed double-layer coiled pipe into a 10-15-meter-long external insulation and internal NH 3 In the closed annealing furnace 4 that decomposes the protective gas, anneal at 830°C to 900°C for 30 to 50 seconds to realize overaging annealing of the double-layer welded pipe; the annealed double-layer welded pipe is continuously sent to the internal NH 3 Decompose the protective gas, and cool evenly in the c...

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Abstract

A technology for manufacturing a rolled and welded dual-layer tube used for the connection between indoor and outdoor units of air conditioner includes such steps as decoiling the copper plated steel band made of low-carbon non-gap atomic steel, spreading on rolling machine, rolling it by 720 deg. to become a dual-layer tube, soldering in NH3 gas, annealing in NH3 gas, cooling, spraying passivated water, and coiling.

Description

technical field [0001] The invention belongs to the field of manufacturing engineering, and in particular relates to a production process of a double-layer rolled welded pipe used for connecting indoor and outdoor units of an air conditioner. Background technique [0002] Double-layer coiled welded pipe is a kind of small-diameter thin-walled double-layer straight seam formed by cold-rolled strip steel with double-sided copper plating, rolled at 720° on a special forming unit to form a double-layer coiled welded pipe tube, and then brazed at high temperature. Precision steel pipe. The pipe has the characteristics of high pressure resistance, corrosion resistance, high vibration fatigue resistance, smooth inner surface and low price. It is an ideal pipe to replace copper pipes. It has been produced in my country for nearly 20 years. It was mainly used in refrigerators and freezers in the early stage. Condenser pipes (now gradually replaced by single-layer welded pipes) are cu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P15/00B21C37/08C21D9/08C21D11/00F16L9/18
Inventor 王积科孙鲁灵李永春
Owner 芜湖源大管业有限公司
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