Self-cleaning filter_Aite(Henan) environmental protection equipment Co.

Product introduction

Self-cleaning filter is a kind of precision equipment that uses the filter screen to directly intercept the impurities in the water, remove suspended matter, particulate matter, reduce turbidity, purify water quality, reduce system dirt, bacteria and algae, rust, etc., in order to purify water quality and protect the normal work of other equipment in the system. The water enters the self-cleaning filter body from the water inlet, due to the intelligent (PLC, PAC) design, The system can automatically identify the degree of impurity deposition, and automatically blow down the sewage valve signal.

Basic characteristics

* Single water treatment: 10-200m /h.

* Minimum working pressure: 2bar (30psi).

* Maximum working pressure: 1.0MPa, 1.6MPa.

* Filter cleaning pressure loss: 0.01MPa.

* Maximum operating water temperature: 65℃ (149°F).

* Filtration accuracy range: 25-400μm (micron).

* Water requirement for self-cleaning: 2-4" over swimmer, -8 L; 4S-8" Filter, -25 L.

* Self-cleaning time: 5 seconds.

* Self-cleaning control mode: pressure difference, time and manual.

* Electric control mode: DC 12V; Ac 24V.

* Filter self-cleaning is completely dependent on the water pressure in the system line, without external power.

Working principle

The water enters the filter from the water inlet, first filters out the impurities of larger particles through the coarse filter element assembly, and then reaches the fine filter screen. After filtering out the impurities of fine particles through the fine filter screen, the water is discharged from the outlet.

In the filtration process, the inner layer of impurities of the fine screen gradually accumulate, and a pressure difference is formed between the inner and outer sides of it. When this pressure difference reaches a preset value, the automatic cleaning process begins: the blowdown valve is opened, and the hydraulic motor chamber and hydraulic cylinder of the main assembly release pressure and expel water; Hydraulic motor room and suction pipe pressure drops significantly, because of the negative pressure, through the suction nozzle to absorb the fine filter screen inner wall of the dirt, by the hydraulic motor into the hydraulic motor room, discharged by the blowdown valve, forming a pollution absorption process. When the water flows through the hydraulic motor, it drives the sewage suction pipe to rotate, and the hydraulic cylinder piston drives the sewage suction pipe to make axial motion. The sewage suction device assembly is completely cleaned through the combination of axial motion and rotary motion. The whole cleaning process will last tens of seconds. The blowdown valve closes at the end of cleaning, and the increased water pressure returns the hydraulic cylinder piston to its initial position as the filter prepares for the next flush cycle. In the cleaning process, the filter normal filtration work uninterrupted.

Principle of automatic backwashing: As mentioned earlier, backwashing is achieved by hydraulic valve opening and hydraulic cylinder piston action, and these are controlled by backwashing controller. The backwash controller accurately controls the hydraulic valve and cylinder according to the pressure difference transmitted from the filter inlet and outlet. The power of the controller comes from the pressure of the pipeline itself.

Self-cleaning filter characteristics: continuous water supply when backwashing, the whole backwashing is realized in such a way that the suction nozzle cleans every point of the filter screen. Backwashing is only a small local pressure change between the nozzle and the fine filter, and the action of the collector and the hydraulic cylinder does not affect the normal water supply. At the same time, the amount of water consumed in backwashing is very small, with a flow rate of 300m3/h. For example, the backwashing flow of the filter is 35-40m3 /h, the backwashing time is 7-15 seconds, and the backwashing water is 80-160L [1].