Method for machining porous-surface heat-exchange pipe for boiling heat-transfer equipment

Abstract

The invention discloses a method for machining a porous-surface heat-exchange pipe for boiling heat-transfer equipment, aiming at providing a heat-exchange pipe and a machining method with the advantages of simple process, convenience for machining, no falling of a machined porous surface and capability of machining various complex structural forms. The method comprises the steps of: cutting an aluminum alloy sheet according to developed dimensions of a base pipe and a porous layer of a heat-exchange pipe respectively to obtain aluminum alloy sheets which are respectively used for machining the base pipe and the porous layer and have the same dimensions as the developed dimensions of the base pipe and the porous layer of the heat-exchange pipe; respectively evening out; placing the evened-out aluminum alloy sheet for machining the porous layer in the middle of a terrace die and a hollowing die, and punching the aluminum alloy sheet for machining the porous layer by using the terrace die and the hollowing die; superposing and thermally pressing a porous layer substrate and the evened-out aluminum alloy sheet for machining the base pipe so that the porous layer substrate and the evened-out aluminum alloy sheet for machining the base pipe are integrated; and then, machining the evened-out aluminum alloy sheet for machining the base pipe into a pipe shape, and welding both the machined aluminum alloy sheets to obtain the aluminum alloy heat-exchange pipe with the porous surface.

Description

technical field [0001] The invention relates to a processing method for a surface porous aluminum alloy heat exchange tube used in boiling heat transfer equipment and the processed heat exchange tube. Background technique [0002] At present, most of the boiling heat transfer equipment in the refrigeration system still adopts the shell and tube structure. Metal materials, reducing the weight of equipment, is the research direction of heat exchange equipment. For the heat transfer enhancement of boiling heat transfer equipment with phase change, porous surfaces are commonly used to enhance boiling heat transfer. [0003] At present, the existing methods for forming porous surfaces mainly use sintering, spraying, electroplating and other methods to attach another metal powder to the metal surface. cost. At the same time, the metal coating is easy to fall off during use, which affects the service life of the equipment. However, the existing mechanical processing uses specia...

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Problems solved by technology

[0003] At present, the existing methods for forming porous surfaces mainly use sintering, spraying, electroplating and other methods to attach another metal powder to the metal surface. cost

At the same time, the metal coating is easy to fall off during use, which affects the service life of the equipment

However, the existing mechanical processing uses special tool rolling and extrusion processing on special machine tools. The processing mechanism is very complicated, and the shape and size of the hole are difficult to control. Only heat exchange tubes with simple structural shapes can be processed.

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