Ⅰ.Overview

Automatic self-cleaning filter is a kind of precision equipment which can directly intercept the impurities in water by using the filter screen to purify the water. It has the function of filtering the raw water and cleaning the filter element automatically, and the system provides continuous water supply when cleaning and discharging. Compared with the previous filters, this filter has the advantages of higher automation level, larger treatment capacity, self-cleaning ability, continuous water supply, and wide application and so on.

There are two control modes for the automatic self-cleaning filter: automatic control mode and manual control mode.

Automatic control mode: it includes two modes: timing mode and differential pressure mode.

The filtration time is set on the filtration timer. When the filtration time is up, the wastewater discharge process will be launched and the wastewater discharge time is set by the drain timer; At the same time, the control system can compare the system pressure difference with the pressure difference set by the user in real time. When the system pressure difference reaches the set pressure difference, the filter can conduct the wastewater discharge process, and the wastewater discharge time is set by the timer. It will stop cleaning process when the wastewater discharge time is up, and the system will be restored to its initial state and ready for the next filtration process.

Manual control:set the manual/automatic switch on the operation panel to the manual position, and the filter starts to discharge wastewater.

Ⅱ. Working Principle

The raw water enters the main body of the device from the water inlet. Firstly, external pressure make the raw water flow through the coarse filter screen to filter the larger granular impurity. The water coming from the coarse filter screen enters into the fine filter screen by the internal pressure. With the accumulation of various pollutants in the filter media inside the fine filter screen, the filter channel is blocked, and the pressure difference between the inlet and outlet increases gradually. When the pressure difference reaches the preset value, the differential pressure transmitter connected to the inlet and outlet converts the detected differential pressure signal into the current signal of the 4-20mA, then transfers the current signal to the control system (The backwashing cycle can also be achieved by setting the time). The system automatically starts the stroke motor and backwash high-pressure pump, and the transmission device drives the wastewater discharge shaft with the suction nozzle to rotate and move horizontally in the inner side of the filter. At the same time, outside the filter screen, the backwash high-pressure pump and wastewater discharge device work synchronously and present a corresponding relationship. With a small portion of the water, the two devices can work together to conduct high-pressure backwashing to the filter screen. The water passing through the filter screen and impurities removed from the filter screen will be quickly sucked into the wastewater discharge shaft by the suction nozzle and finally discharge from the drain chamber.

III. Technical Parameters

Flow Range: 40 ~ 500m³/h

Filtration Precision: 2~ 200μm

Working Pressure: 0.2~ 1.0Mpa

Pressure Loss: ≤0.016Mpa

Calibre of Drain valve: DN 50 mm

Drain Time: 10 ~ 30 seconds

Applicable Temperature: ≤65 °C

Control Voltage: AC three-phase electricity 380V/ 50Hz

Control Interface: rotary switch, key switch

Type of Filter Screen: metal sintered screen, metal wedge-type screen, and stainless steel sintered screen

Ⅳ.Product Characteristics

1）The filtration precision is defaulted to 10 μm, and the range is from 10 μm to 3000 μm. The filtration area is large and the dirt holding capacity is high. The user can customize this device according to the actual working condition.

2) The cleaning method is simple, and the circulation cleaning is monitored by electronic device. It can realize automatic cleaning and wastewater discharge. All the parameters of automatic self-cleaning filter control system can be adjusted.

3) This device is equipped with overload protection device that can effectively protect the motor.

4) It has the characteristics of continuous water supply without bypass pipes when cleaning and wastewater discharge. The cleaning time is short, the water consumption when discharging the wastewater is less, only 1% of the total flow.

5)It is simple and convenient to maintain and easy to install and disassemble.

6) It connects with pipelines by flanges, and the flange is the national standard flange, so it is widely used.