A kind of heat exchanger surface coating and heat exchanger surface treatment method

Abstract

The invention discloses a surface coating for a heat exchanger. The coating comprises a priming paint layer and a Teflon layer from inside to outside, wherein the priming paint layer is 7-9 mum in thickness; the Teflon layer is 20-30mum in thickness. Moreover, the invention further discloses a surface treatment method for the heat exchanger. The method comprises the following steps: drying and degreasing the surface of the heat exchanger, removing oil impurities on the surface, and removing a surface paint layer or oxide impurities by performing sand blasting or rinsing; spraying a priming paint layer or a Teflon layer, and soaking a layer of grease outside a Teflon coating, wherein an aluminum base surface is tightly bonded with the Teflon layer through the priming paint layer, and Teflon has hydrophobic and oleophylic characteristics, so that a selected oil layer can be adsorbed onto the surface tightly. The coating surface has the characteristics of mist resistance and frosting delay of a hydrophobic surface as well as the characteristic of easiness in defrosting and draining of an oil layer.

Description

technical field [0001] The invention designs a surface treatment method of a heat exchanger, in particular a surface spraying treatment method of a heat exchanger with anti-frost characteristics. Background technique [0002] In recent years, with the development of the refrigeration industry and the increase in the cost of raw materials for copper heat exchangers, the improvement of energy saving and cost savings for air conditioners has made frost prevention and defrosting a hot spot for research and application. [0003] When the heat pump air conditioner performs the heating cycle, the outdoor heat exchanger absorbs heat from the outside and supplies the refrigerant. The traditional heat exchanger pipes and fins are made of copper, with a pipe diameter of 0.8-2cm, and the heat transfer efficiency is low. The cost of materials is getting higher and higher, so the research hotspot begins to focus on aluminum parallel flow flat tube heat exchangers, whose channel diameter i...

AI Technical Summary

Problems solved by technology

[0003] When the heat pump air conditioner performs the heating cycle, the outdoor heat exchanger absorbs heat from the outside and supplies the refrigerant. The traditional heat exchanger pipes and fins are made of copper, with a pipe diameter of 0.8-2cm, and the heat transfer efficiency is low. The cost of materials is getting higher and higher, so the research hotspot begins to focus on aluminum parallel flow flat tube heat exchangers, whose channel diameter is 0.5-0.8mm, which belongs to microchannel parallel flow, because the heat transfer efficiency of microchannels is greatly improved , it absorbs more heat when performing heating conditions, resulting in more serious frosting on the surface of pipes and fins. The surface of the commonly used 3003 aluminum alloy is slightly hydrophilic, and the contact angle is 50~ Between 60°, it is not conducive to anti-fog and anti-frost

[0004] Due to the intensification of frosting, the heat transfer efficiency of the heat exchanger is greatly reduced. The most commonly used solution is to use feedback control to start the defrosting mechanism, so that the heat exchanger operates in reverse, and then continue the heating cycle after a period of time