Impurity filtering device with automatic back wash function and filtering method

Abstract

The invention discloses an impurity filtering device with an automatic back wash function and a filtering method. The filtering device comprises a shell and a control system, the shell is provided with a water inlet and a water outlet, the shell is internally provided with a mounting cylinder, the mounting cylinder is provided with a plurality pf holes, the water inlet is arranged in the upper endof the shell, the water outlet is arranged in a shell (1), the water outlet is connected with a three-way valve, one end of the three-way valve is connected with a water storage tank, the other end is connected with a clear water source, a filtering mesh bag is sleeved in the mounting cylinder, a support frame is sleeved in the filtering mesh bag, the support frame is used for supporting and laminating the filtering mesh bag in the mounting cylinder, the shell is provided with a pressure detection component, the pressure detection component is used for detecting a hydraulic pressure value ofan area in a chamber between the water inlet and the filtering mesh bag, and the control system is used for connecting the pressure detection component with the three-way valve. By using the device, when the permeability of the filtering mesh bag is reduced, clear water is used for back wash of the filtering mesh bag, the filtering mesh bag does not need to be taken out, the filtering device is cleaned alone, the disassembly and assembly time is saved, and the automatic blockage removal cleaning of the filtering device is realized.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to an impurity filtering device with automatic backwashing and a filtering method. Background technique [0002] After the filter screen in the existing filter device is used for a period of time, the filtered material often adheres to the filter screen holes. After the accumulation of particulate matter and flocs intercepted on the filter screen increases, the permeability of the filter screen decreases, which affects the performance of the filter device. In terms of work efficiency, the conventional method is to take out the filter screen from the filter device at regular intervals, manually clean the particles and flocs on the filter screen, and then put them into the filter device for use to save costs, but this method is due to The filter screen enters and exits one by one in the filter device, which is inconvenient to assemble and disassemble, time-consuming and labor-intensive...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the existing in the prior art that the filter screen is taken out from the filter device at regular intervals, the particles and flocs on the filter screen are cleaned manually, and then put into the filter device for use. Method Due to the disadvantages of inconvenient assembly and disassembly, time-consuming and labor-intensive time-consuming and labor-intensive installation and disassembly of the filter screen in the filter device, an impurity filter device and a filter method with automatic backwashing are provided.

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