Liquid filtering method and filtering device

Abstract

The invention discloses a liquid filtering method. Liquid to be filtered is filtered from the outer side of a conical filtering screen to the inner side; an openable sewage discharging opening is formed in the outer side of the conical filtering screen; impurities blocked by the conical filtering screen can be discharged from the sewage discharging opening. The invention further discloses a liquid filtering device. The liquid filtering device comprises an equipment body and a filtering body positioned in the equipment body; the filtering body is the conical filtering screen; the open end of the conical filtering screen is hermitically and fixedly connected with the inner wall of the equipment body; the conical outer side of the conical filtering screen is a liquid feeding side, and the conical inner side of the conical filtering screen is a liquid discharging side; a liquid inlet and a sewage discharging opening are formed in the equipment body at the liquid feeding side; the sewage discharging opening is formed in the lowest end of the equipment body at the liquid feeding side; a sewage discharging valve is arranged at the sewage discharging opening; a liquid outlet is formed in the equipment body at the liquid discharging side. According to the liquid filtering method and the liquid filtering device, by the adoption of the conical filtering body for reverse filtering, fluid forms shearing force on the surface of the filtering body, so that the water film forming possibility is reduced, and the loss of filtering resistance is reduced; the liquid filtering device has a self-cleaning resetting function of the filtering body.

Description

technical field [0001] The invention relates to the technical field of liquid filtration, in particular to a liquid filtration method and a filtration device. Background technique [0002] At present, the devices used for the separation of solids and suspended solids in fluid media mainly include Y-type filters, mechanical backwash filters, brush filters, and internal suction filters. The filtering principle of these filtering devices is to use a filter screen to trap the solids and suspended matter in the liquid to be filtered inside the filter screen. With such continuous filtering, more and more solids and suspended matter will be retained. The filtration speed is getting slower and slower, but the liquid to be filtered is still entering continuously, and the filter holes of the filter screen are getting smaller and smaller, thus generating a pressure difference inside and outside the filter screen. When the pressure difference reaches the set value, it is necessary to s...

AI Technical Summary

Problems solved by technology

This type of technology has complex structure, high investment cost and complicated maintenance

[0004] It can be seen that the existing filter screen (hole) liquid filtration technology has disadvantages such as complex structure, high investment and operating costs, and complicated operation and maintenance.

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