Factory-made self-cleaning filters: Tailored for your process industry, solving specific water quality filtration problems
The operation process of the self-cleaning filter can be summarized as "normal operation → pressure difference/timing trigger → automatic cleaning → resumption of operation".
Filtering process:
The fluid to be filtered enters the filter through the inlet and passes through the cylindrical filter screen from the inside out. The solid impurity particles are retained on the inner side of the filter screen. The clean fluid flows out through the outlet.
Impurity Retention:
As impurities accumulate on the inner side of the filter screen, the filtration channel gradually narrows, and the resistance of the fluid passing through the filter screen increases, thereby causing the pressure difference (pressure drop) between the inlet and outlet of the filter to continuously rise.
Cleaning trigger:
Pressure differential control (mainstream): When the pressure differential value reaches the preset trigger value, the pressure differential sensor sends a signal to the control box, initiating the automatic cleaning procedure. This is the most scientific and energy-efficient control method.
Timed control: Users can preset a cleaning cycle (such as 1 hour or 2 hours). Once the preset time is up, the cleaning will automatically commence, regardless of the actual pressure difference.
Manual control: Press the cleaning button manually on the control box to force the cleaning process to start.
Automatic cleaning process:
An electric or hydraulic-driven suction scanner (or rotating brush) moves axially within the filter screen.
At the same time, one or more of the flushing valves (waste discharge valves) of the filter automatically open.
Under the influence of system pressure, a small portion of the cleaning fluid (approximately 1% - 5% of the total flow) flows back through the filtration outlet and enters the suction scanner, forming a high-speed jet stream.
As this jet stream passes over the surface of the filter screen, it generates a strong suction force, which completely sucks away and washes away the impurities that have been trapped on the filter screen, and then quickly discharges them through the drainage valve from the system.
The entire cleaning process lasts only 10 to 60 seconds and has an extremely minimal impact on the flow and pressure of the main system.
Resuming operation:
After the cleaning process is completed, the discharge valve is closed, the scanner is returned to its original position, the filter immediately returns to the full-flow filtration state, and the pressure difference returns to the initial value.
Fully automatic, no downtime:
Achieve 24-hour continuous operation, no need for manual intervention for cleaning, significantly reducing maintenance time and labor costs.
Efficient and thorough cleaning:
Utilizing a combination of suction scanning and backwashing techniques, the cleaning effect is excellent and it can effectively restore the flow capacity of the filter.
Water and energy conservation:
The self-cleaning process consumes only a very small amount of system water. Compared to traditional manual cleaning or disposable filter elements, the long-term operating cost is extremely low.
Pressure differential control, intelligent economy:
The "on-demand cleaning" mode avoids unnecessary cleaning, extends equipment lifespan, and is more intelligent.
Compact structure, easy installation:
Modular design, small footprint, can be flexibly installed in various piping systems.
High filtration accuracy:
The filter mesh has a wide range of precision, allowing for selection from several micrometers to several thousand micrometers (such as 20μm to 3000μm), meeting the requirements of various working conditions.
Reliable operation and long lifespan:
Core components such as the filter screen and transmission mechanism are made of high-quality stainless steel and other corrosion-resistant materials, ensuring durability.
Self-cleaning filters are widely used in various industries where there are requirements for fluid cleanliness:
Industrial circulating cooling water system: Protects equipment such as cooling towers, heat exchangers, and spray heads from clogging.
Central air conditioning system: Protects the refrigeration unit, plate heat exchanger, water pump and valves.
Primary water treatment: Conduct preliminary filtration on surface water (river water, lake water) and reservoir water to protect the subsequent precision filters and water treatment equipment.
Metallurgical and petrochemical industries: Filtration of continuous casting water, high-pressure phosphorus removal water, emulsified liquid, and process circulating water.
Paper-making industry: Filtration of white water and process water, recovery of fibers.
Electric power industry: Filtration of generator stator cooling water and closed-loop cooling water.
Agricultural irrigation: Water filtration for drip irrigation and sprinkler systems to prevent clogging of the drippers.
Food industry: Filtration of process water and cleaning water.
Main Types:
Suction-type self-cleaning filter: The most common type, as mentioned above.
Brush-type/Scraping-type self-cleaning filter: Suitable for large amounts of viscous and easily adhering impurities. It physically removes contaminants through rotating brushes or scrapers.
Backwash filter: By changing the direction of the water flow, it uses the reverse water flow to wash the filter screen, and is commonly used in multi-tank and connected systems.
Key parameters that need to be considered for the selection:
Flow rate handling: (m³/h) Determines the size of the filter.
Pipeline pressure: (MPa/Bar) determines the pressure rating of the filter.
Filtering accuracy: (μm/line) It is determined based on the smallest particle size of impurities to be removed.
Fluid properties: Temperature, pH value, viscosity, main components and content of impurities.
Connection method: Standard flange, specified diameter.
Control mode: Differential pressure, timing, manual, or a combination of these.
Material requirements: Carbon steel, 304 stainless steel, 316L stainless steel, etc. The type of material will be selected based on the corrosiveness of the fluid.