Novel air valve applicable to liquid supplement

Abstract

The invention discloses a novel air valve applicable to liquid supplement. The novel air valve comprises an electromagnetic valve, a liquid inlet source, liquid storage tanks, a liquid supply tank, a plastic sheet, a metal gasket, a spring and a seal ring. The electromagnetic valve is a two-way electromagnetic valve. The liquid inlet source is higher than the liquid storage tanks. The spring is disposed between an upper metal cover and the metal gasket. The plastic sheet is disposed between the metal gasket and a lower metal cover. The seal ring is disposed between the plastic sheet and the upper metal cover. The novel air valve has the advantages that during switching of the electromagnetic valve, although pressure in closed space is changed constantly, pressure in a liquid supply tube and the liquid storage tanks is changed slightly, so that pressure on downstream equipment connected with the liquid supply tube is not affected, and reliability in equipment operation is improved.

Description

technical field [0001] The invention relates to the field of manufacturing crystalline silicon solar cells, in particular to a novel air valve suitable for liquid supply. Background technique [0002] At present, the preparation of polycrystalline silicon solar cells usually includes texturing, diffusion, wax spraying, etching, PECVD coating and screen printing processes. It is usually prepared by acid texturing and wet etching process because of its advantages of low cost and high efficiency. The above two processes mainly use a mixed liquid system of hydrofluoric acid and nitric acid to prepare suede. As the production process requires timely replenishment of liquid, the reflectivity of the suede surface of the prepared polycrystalline silicon wafer can be kept within a controllable range. In the liquid replenishment system of the existing equipment, the solenoid valve is used to control the on-off of the vacuum system, and the vacuum system directly acts on the inside o...

AI Technical Summary

Problems solved by technology

During the production process of the original equipment, the container of the lower equipment is switched on and off irregularly due to the vacuum system, and the internal pressure is constantly changing, which is likely to cause adverse effects on the work of the lower equipment.

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