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Do you know the working principle of automatic backwash filter?

The automatic backwash filter has the functions of filtering medium, automatic cleaning and discharging filter element, and the system can supply continuously during cleaning and discharging. Compared with the previous filter, the equipment has the advantages of high automation, large treatment capacity, self-cleaning and sewage discharge, continuous cleaning, non-stop, and wide application range. The following is the answer to the working principle of automatic backwash filter:

1. The internal structure of automatic backwash filter is composed of pig foot brush or stainless steel wire brush, stainless steel filter screen and transmission part. It has a drive motor and an electric valve, which can clean and discharge sewage automatically. The operation mode is automatic operation (also manual operation), and the equipment has dual functions of differential pressure and timing automatic blowdown. Its automation part adopts the reliable PLC programmable controller.

 Automatic backwash filter

When the water flows through the filter, the mechanical impurities in the water are intercepted by the filter screen. When the accumulation of impurities on the surface of the filter screen increases and the pressure difference reaches 0.04MPa, the development of differential pressure will send a signal, and the PLC will send a command, and the drive motor will start. When the drain valve is opened, the impurities deposited in the filter screen are cleaned by the rotary brush and discharged from the drain outlet. The whole washing and drainage process does not require personnel operation and shutdown. At the same time, the equipment also has the function of regular cleaning and drainage as well as manual cleaning and drainage, so as to ensure the safety and reliability of launching in any situation.

2. The pressurized raw water enters the human body through the water inlet, and first flows through the coarse filter through the external pressure to filter out the larger particle impurities. Water from the coarse filter enters the fine filter under internal pressure to further capture small impurities in the water. At the same time, the ultrasonic wave works synchronously to vibrate the tiny bubble core in the liquid. When the sound pressure reaches a certain value, the bubbles will continue to expand and then close suddenly. When these small bubbles collapse rapidly, high temperature (5000K) and high pressure (thousands of atmospheres) will be generated in the bubbles The liquid around the bubble rushes into the bubble at a high speed. The liquid near the bubble produces strong local shock wave and local high temperature and high pressure, which results in a series of ultrasonic double-click intelligent control differential pressure filter, such as ultrasonic sterilization, cleaning, crushing, emulsifying, dispersing and promoting chemical reaction. Ultrasonic waves with frequencies higher than 20kHz integrate advanced oxidation, incineration, supercritical oxidation and other water treatment technologies. It can not only prevent the filter from scaling and prolong the backwash period of the filter, but also can disinfect and degrade the organic matter.

 Schematic diagram of automatic backwash filter

With the accumulation of various pollutants in the filter media, the filter channel will be blocked inside the fine filter screen, and the pressure difference between the inlet and outlet will gradually increase. When the pressure difference reaches the preset value, the differential pressure transmitter connected to the inlet and outlet will be detected. The detected pressure difference signal is converted into 4-20mA current signal and transmitted to the control system. At the same time, the backwash frequency can also be preset according to the time. When the operation time reaches the preset value, the system will automatically start the stroke motor and backwash high-pressure pump. At this time, the driving device with suction nozzle drives the dust collector to rotate and move horizontally in the filter screen. At the same time, outside the filter screen, the high-pressure backwash device and the sewage treatment device work synchronously and correspond to each other. Under the condition of not interrupting normal operation, only a small part of product water is used for high-pressure backwashing on the filter screen. The backwashing water penetrates into the filter screen, and the impurities stripped from the filter screen are quickly sucked into the dust collector by the suction nozzle, and then sent to the sewage chamber, and then discharged from the sewage outlet.