Electrophoretic coating technique for microchannel heat exchanger coiled tube

Abstract

The invention discloses an electrophoretic coating technique for a microchannel heat exchanger coiled tube. The electrophoretic coating technique comprises the following steps of first, feeding; second, electrophoresis; third, UF recycling; fourth, washing; and fifth, discharging. The microchannel heat exchanger coiled tube is subjected to electrophoresis in a horizontally-placed mode through theelectrophoretic coating technique for the microchannel heat exchanger coiled tube. (As for a traditional electrophoresis mode for the microchannel heat exchanger coiled tube, treatment is conducted inthe vertical direction or the vertically-inclined direction). The treatment technique is safe and controllable, the procedure is convenient to automatically operate, and the workpiece treatment progress can be adjusted at any time; meanwhile, in the UF recycling cleaning step conducted behind an electrophoresis tank, residual electrophoretic paint on the surface of a workpiece is cleaned away through the UF recycling cleaning step, and coating in a cleaned-away electrophoretic paint solution is separated and then recycled into the electrophoresis tank so that coating waste can be reduced, thecoating utilization rate can be increased, and parameters in the electrophoresis tank can further be stabilized; and separated water flows back into the tank, thus, level liquid balance of a tank solution can be ensured, when the electric conductivity in the tank is too high, a small amount of the tank solution can be discharged, and then new pure water is added to decrease the electric conductivity.

Description

Technical field [0001] The invention relates to the field of surface treatment, in particular to an electrophoretic coating process of a microchannel heat exchanger coil tube placed in a horizontal direction. Background technique [0002] The engineering background of the microchannel (microchannel heat exchanger) comes from the cooling of high-density electronic devices in the 1980s and the heat transfer problems of microelectronic mechanical systems that appeared in the 1990s. In 1981, Tuckerman and Pease proposed the concept of a microchannel heat sink; in 1985, Swife, Migliori and Wheatley developed a microchannel heat exchanger for heat exchange between two fluids. With the development of micro-manufacturing technology, people have been able to manufacture micro-sized heat exchangers composed of channels with a hydraulic diameter of 10 to 1000 μm. In 1986, Cross and Ramshaw developed a printed circuit micro-scale heat exchanger with a volumetric heat transfer coefficient of...

AI Technical Summary

Problems solved by technology

[0004] In the production process of microchannel heat exchangers, the coils of the heat exchangers need to be electrophoretic coated. During the traditional process of coating, due to the defects of the placement angle of the product (vertical or vertical inclination), the unreasonable distance between the anode plate and the product (The anode plate is on the left and right sides of the electrophoresis tank and the distance is too large), the distance and time of swinging up and down are not satisfied, and it is very easy to generate multiple bubbles on the coating surface, uneven coating film, and microchannel fin blockage, which affects Coating effect, resulting in lower product quality