Multi-core backwash filter

What is a multi-core backwash water filter

Multi-core backwash water filter is a commonly used self-cleaning filter. This filter contains multiple metal filter elements. When backwashing is performed, the sewage pipe at the lower end is connected with the filter element in turn, and the impurities inside the filter element are removed. The water flows into the sewage pipe to achieve the purpose of cleaning. Fully automatic backwash filters are widely used in metallurgy, chemical industry, petroleum, papermaking, medicine, food, mining, electric power, and urban water supply. Such as industrial wastewater, filtration of circulating water, regeneration of emulsion, filtration and treatment of waste oil, continuous casting water system in metallurgical industry, blast furnace water system, high-pressure water descaling system for hot rolling. It is an advanced, efficient and easy-to-operate fully automatic water filter.

Structure of automatic backwash filter

The multi-core backwashing self-cleaning water filter consists of a shell, multiple filter elements, a backwashing mechanism, an electric control box, a reducer, an electric valve and a differential pressure controller. The diaphragm in the shell divides its inner cavity into upper and lower cavities. The upper cavity is equipped with multiple filter elements, which makes full use of the filter space and significantly reduces the volume of the filter. The lower cavity is equipped with backwashing sucker. When working, the turbid liquid enters the lower cavity of the filter through the inlet, and enters the inner cavity of the filter element through the baffle hole. The impurities larger than the gap of the filter element are retained, and the clean liquid passes through the pores to reach the upper cavity, and finally is sent out from the outlet.

How Backwash Water Filters Work

The water filter core adopts high-strength Johnson wedge-shaped filter screen, which automatically cleans the filter element through differential pressure control and timing control. When the impurities in the filter accumulate on the surface of the filter element, the pressure difference between the inlet and outlet increases to the set value, or when the timer reaches the preset time, the electric control box sends a signal to drive the backwashing mechanism. When the mouth of the backwash suction cup and the inlet of the filter element are directly opposite, the drain valve is opened, and the system is depressurized and drained, and a negative pressure area with a relative pressure lower than the water pressure outside the filter element appears on the inside of the suction cup and the filter element, forcing part of the net circulating water to flow from the outside of the filter element. Flow into the inner side of the filter element, and the impurity particles adsorbed on the inner wall of the filter element flow into the pan with the water and are discharged from the drain valve. The specially designed Johnson mesh creates a jet effect inside the filter element, any impurities will be washed away from the smooth inner wall. When the pressure difference between the inlet and outlet of the filter returns to normal or the timer set time expires, the motor stops running and the electric drain valve closes. During the operation of the backwash filter, the system does not interrupt the water supply, and the backwash action consumes less water.

Features of automatic backwash water filter

1. The filter deceleration mechanism adopts NRV type reducer, and the shell adopts high-quality aluminum alloy die-casting structure, which has good heat dissipation, low noise, light weight and large bearing capacity;
2. The sealing device adopts reinforced PTFE double-end sealing structure, which has reliable sealing performance, long service life and strong pressure bearing capacity;
3. There is an automatic exhaust valve on the top, which is compact in structure and sensitive in opening and closing;
4. The differential pressure sampling part adopts an adjustable differential pressure controller, and the signal feedback is correct;
5. The filter element adopts high-strength Johnson filter screen, which has high gap accuracy, large effective filtering area, small pressure drop and high backwashing efficiency;
6. The filter element plate seat is made of 304 stainless steel, and the working interface of the backwash suction cup is mirror-treated;
7. The backwash suction cup adopts the reinforced PTFE structure and the backwash suction cup self-aligning mechanism, which can ensure the long-term sealing between the suction cup and the filter element plate, and enhance the backwashing effect;
8. The electrical control part of the filter adopts PLC programmable controller, the cleaning mode adopts differential pressure control, timing control and manual control parallel mode, and the cleaning procedure adopts timing positioning mode, the backwashing water consumption is small, and the cleaning is thorough;
9. The electric control box adopts the outdoor waterproof structure of the column full transparent screen;

The parameters of water filter 

Processing capacity: 20~3000m3/h
Working pressure range: 0.1~1.6Mpa
Working temperature: 200℃
Filter element accuracy: 25~3000μm
Filter element material: 304, 316L, Hastelloy, PTFE
Filter element type: wedge filter element, composite filter element, punching filter element
Body material: CS; 304; 316L; CS+PTFE
Sealing material: nitrile rubber, fluorine rubber
Electronic control mode: 2-phase 220V 50Hz; 3-phase 380v 50Hz
Blowdown valve control mode: manual, pneumatic, electric
Self-cleaning control mode: differential pressure, time, manual

Control method of automatic backwash water filter

The multi-core fully automatic backwashing self-cleaning water filter produced by Xxfil has various control methods such as manual control, differential pressure control and timing control. Users who use Xxfil water filters can choose the appropriate control method according to the situation. .
1. Timing mode under automatic control state.
The filtration time is set on the filtration time timer. When the working time of the filter reaches the predetermined value, the cleaning and sewage mode will be activated. The inside of the filter element stops entering water, and under the action of pressure, the water enters from the outside to the inside, and the internal impurity particles are discharged out of the machine through the connecting arm. The sewage time of the equipment is controlled by a timer. After the sewage time reaches the preset value, the water The filter stops sewage discharge and continues to play a filtering role.
2. Differential pressure mode in automatic control state.
The automatic backflushing self-cleaning water filter is equipped with a differential pressure controller. When the differential pressure of the filter reaches the set value, the filter enters the cleaning and sewage mode. The cleaning process is the same as the timing mode.
3. Manual control.
This control method of the backwash water filter is rarely used, and it is the best method for system debugging, system working status detection, system troubleshooting and on-demand cleaning and sewage discharge. You just need to turn on the manual control switch on the control panel and do the cleaning and sewage work.

Application of backwash water filter

1. Industrial circulating water filtration:
It can be used for water supply and drainage pipelines of equipment with certain requirements on water quality, such as cooling towers, rolling mills, continuous casting machines, polishing machines, ion exchangers, sprayers, heat exchangers, etc. It filters out impurities in the water and prevents clogging of parts.
2. Raw water treatment:
It can filter surface water, lake water, seawater, reservoir water, well water and groundwater to remove sand, bacteria, algae, organic matter, etc.; boiler wet dust removal for water filtration; for seawater filtration.
3. Cooling water treatment:
Water filtration in cooling towers, make-up water systems, air conditioning systems and once-through systems to reduce the generation of sediment in heat exchangers and maintain their cooling effect; power plants to cool steam turbines.
4. Metallurgy, petrochemical, food and pharmaceutical industries:
Liquid, industrial wastewater, emulsion regeneration and waste oil filtration treatment: continuous casting water, blast furnace water system, hot rolling high pressure water descaling system.
5. Paper industry:
white water filtration
6. Plastic industry:
For cooling water filtration during product recovery.

What to pay attention to when using a water filter

1. You need to ensure that the specifications of the filter should match the installation pipeline. When the filter flow cannot meet the pipeline requirements, two (or more) filters can be installed in parallel, or the filter can be installed in the bypass. .
2. The filter should be installed as far as possible in the place to be protected by the system. The low pressure of the inlet will affect the use, so it should also be installed in the place close to the pressure source.
3. The filter should be installed in series in the pipeline system. In order to ensure the uninterrupted water supply of the system when the system is shut down for maintenance, it is recommended to set up a bypass in the system, and the inlet and outlet of the filter and the bypass should be equipped with a ball valve for cutting off. Where backflow is possible, a check valve should be installed at the filter outlet.
4. When selecting models, pay attention that the temperature of the water flowing through the automatic self-cleaning filter does not exceed its adaptable temperature.
5. The installation site has three-phase 380V power frequency alternating current (three-phase four-wire system). The sewage pipe should not exceed 5 meters to avoid back pressure.
6. Pay attention to filtration accuracy, pretreatment, and pressure in the DC system, and use the timing control type with caution in the intermittent system.
7. Reasonably choose the installation environment, pay attention to waterproof, rainproof and moistureproof.
Note: The backwash system stops running for a long time or seasonally. Before the system stops running, add an appropriate amount of corrosion inhibitor to the water, and take measures to prevent corrosion and protect the system.