Filter device with capabilities of switching operation and automatic backwashing and control method

Abstract

The invention relates to a filter device with capabilities of switching operation and automatic backwashing and a control method. The filter device and the control method are used for keeping continuous operation of filters and realizing automatic deep backwashing. The filter device comprises filter units, a programmable controller and monitoring equipment, wherein the two filter units are identical in structure and connected in parallel; a differential pressure transmitter monitors pressure values of inlets and outlets of the filters; the programmable controller switches operation of the twofilter units according to the pressure values monitored by the differential pressure transmitter and filter time, filter operation can be performed continuously, the stopped filter unit is controlledby the programmable controller for backwashing, and the backwashing effect is guaranteed. The problems about continuous operation and automatic backwashing of the filter device are solved, filter operation can be still exerted during backwashing for pollution discharge, and normal operation of the filter device is not affected. The filter device has the advantages of compact structure, stable andreliable operation, high treating capacity, long service life and the like and has great popularization and application values.

Description

technical field [0001] The invention relates to a filtering device capable of switching and maintaining continuous operation and capable of automatic deep backwashing and a control method, and belongs to the technical field of filtering equipment and methods. Background technique [0002] In the filter devices used by many enterprises, as the filter continues to filter, the solid phase impurities in the liquid are trapped on the surface by the filter element and gradually deposited, resulting in a larger pressure difference between the two ends of the filter element and a further increase in filtration resistance. Large, resulting in a decrease in filtration efficiency, must be shut down for maintenance to restore the filtration function. If the filter element is severely clogged, it is likely to cause the filter element to fail or be damaged, which will cause a production accident or stop the system. Therefore, the clogged filter element must be replaced. [0003] The gene...

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Problems solved by technology

[0002] In the filter devices used by many enterprises, as the filter continues to filter, the solid phase impurities in the liquid are trapped on the surface by the filter element and gradually deposited, resulting in a larger pressure difference between the two ends of the filter element and a further increase in filtration resistance. Large, resulting in a decrease in filtration efficiency, must be shut down for maintenance to restore the filtration function

If the filter element is severely clogged, it is likely to cause the filter element to fail or be damaged, which will cause a production accident or stop the system, so the clogged filter element must be replaced

[0003] The general filter device needs to interrupt the filter operation during cleaning in order to replace the filter element or take out the filter element for cleaning, which is time-consuming and troublesome, affects the processing efficiency, and cannot meet the requirements of automatic continuous operation

At present, filters with automatic backwashing function generally use a single medium such as water and gas for backwashing. The ability is poor, which also affects the backwashing effect of the filter

[0004] To sum up, at present, the filter devices of enterprises have the disadvantages of continuous operation during maintenance, unsatisfactory backwashing effect and automatic control. With the advancement of technology and the improvement of automation and intelligence, it is very necessary to upgrade the The filter device is improved

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