Preparation method for evaporating pipe of flooded evaporator

Abstract

The invention discloses a preparation method for an evaporating pipe of a flooded evaporator. The preparation method comprises the steps that spiral internal teeth are rolled on the inner wall of a copper pipe, and then the inner surface and the outer surface of the copper pipe are cleaned and dried; the copper pipe is sleeved with a fine copper powder particle limiting pipe, introduced into a sintering furnace to be sintered with protective gas, discharged out of the sintering furnace and cooled, the fine copper powder particle limiting pipe is pulled away, and a fine copper powder particle capillary-structure layer is combined with the outer wall of the copper pipe; the fine copper powder particle capillary-structure layer is sleeved with a coarse copper powder particle limiting pipe, introduced into the sintering furnace to be sintered with protective gas, discharged out of the sintering furnace and cooled, the coarse copper powder particle limiting pipe is pulled away, a coarse copper powder particle capillary-structure layer is combined with the outer side of the fine copper powder particle capillary-structure layer, and a pipe blank is obtained; and the pipe blank is introduced into the sintering furnace to be sintered with protective gas, discharged out of the sintering furnace and cooled, and the evaporating pipe of the flooded evaporator is obtained. Thermal contact resistance between the copper pipe and the fine powder particle capillary-structure layer as well as between the copper pipe and the coarse powder particle capillary-structure layer is avoided, and the heat exchange performance is good; a heat transfer coefficient is increased; and the maximum effect of the thermal conductivity is achieved.

Description

technical field [0001] The invention belongs to the technical field of heat exchange tube preparation, and in particular relates to a method for preparing an evaporation tube of a flooded evaporator. Background technique [0002] As known in the industry, in the fields of refrigeration, air-conditioning engineering, and energy and power engineering, it is common to involve refrigeration system units and air-conditioning system units in which liquid evaporates on the outer surface of the tube bundle, and most of the large-scale central air-conditioning centrifugal units use flooded evaporators. Due to the good plasticity of copper material, copper tubes are usually used for flooded evaporator tubes. In order to increase the heat transfer area and increase the heat transfer coefficient, fins (usually called outer fins) are formed on the outer wall of the copper tube by extrusion rolling or welding, and inner fins are rolled on the inner wall of the copper tube. [0003] There...

AI Technical Summary

Problems solved by technology

However, this patent scheme does not give the enlightenment of the specific technical connotation of copper powder sintering on the outside of the tube, and the copper powder is sintered at high temperature to form an integrated structure with the tube body, which can avoid the aforementioned contact thermal resistance and obtain ideal pores. And to achieve the desired dimensional accuracy, but there are no relevant reports in the Chinese and foreign patents and non-patent literature published so far

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