What is self-cleaning filter?

In systems lacking sufficient filtration, pipes are prone to accumulating deposits, compromising overall efficiency. The presence of impurities in the water can result in excessive scale buildup, equipment clogging, and diminished pump performance. Such issues necessitate extensive maintenance, leading to system shutdowns and increased expenses. Self-cleaning water filters offer a solution by automatically cleaning themselves according to pre-set parameters, effectively eliminating these concerns.

Self-cleaning filters utilize system pressure to clean themselves. The rigid cylinder screen inside the filter strains the particles from the water source, trapping the debris inside. This buildup can cause differential pressure from the inlet to the outlet. 

They are mainly uesd in electric power, reverse osmosis pre-stage, petrochemical, fine chemical, food and beverage, automotive, industrial, metallurgical, paper, pharmaceutical, microelectronics, environmental protection water treatment and other industries.

There are three type of self-cleaning filters: 

Brush type self-cleaning filter, multi-column self-cleaning filter, Sucking self-cleaning filter.

Brush type self-cleaning filter

Users can select self-cleaning filters with filtration accuracy ranging from 50 to 5000 microns, boasting ample filtration area and superior dirt-holding capacity. Customization options cater to specific operational needs. The cleaning process is straightforward, with monitoring of cleaning cycles enabling automatic cleaning and discharge. All parameters within the automatic filter control system are adjustable for tailored performance. Equipped with motor overload protection, the filter ensures motor safety and longevity.

Working Principle

The automatic self-cleaning filter efficiently filters raw water while automatically cleaning and discharging the filter element, ensuring uninterrupted water supply during cleaning and discharge cycles.

Automatic cleaning can be achieved through two control methods: automatic control and manual control.

Automatic Control: This method offers two approaches—timing and differential pressure. In timing control, users set the filtering duration using the timer, triggering discharge when the preset filtering time elapses. Discharge duration is determined by the discharge timer. Additionally, the control system continuously compares the real-time system pressure difference with the user-set pressure difference. Once the system pressure difference reaches the predetermined threshold, the filter initiates cleaning and discharge, with discharge duration determined by the discharge timer. Upon completion of the discharge cycle, cleaning ceases, and the system returns to its initial state, poised for the next filtration process.

Manual Control: Users can manually activate cleaning by turning the manual/automatic selector switch on the operation panel to the manual position, prompting the filter to discharge.

Multi-column self-cleaning filter

The multi-column self-cleaning filter is a versatile industrial automatic filter that caters to a wide array of applications, ensuring the delivery of pure and dependable filtered liquids. Designed to meet standard water filtration requirements, it excels in capacity, precision, and reliability, even in demanding operating environments.

Working Principles

Water enters the system through the inlet and first passes through a coarse filter, which removes larger particles and impurities. Subsequently, the water reaches the fine filter, where the filtration process occurs. During filtration, the fine screen gradually accumulates dirt and impurities, forming a layer of filtering impurities on its inner side. This buildup creates a pressure differential between the inner and outer sides of the fine screen. When the pressure difference reaches a preset value, the automatic cleaning process initiates.

During cleaning, clean water continues to flow, while the cleaning valve opens, causing a significant drop in water pressure within the cleaning chamber and the dirt suction device. Utilizing the pressure difference between the filter cartridge and the dirt suction tube, suction force is generated between the suction tube and the cleaning chamber through the suction nozzle, facilitating a suction process to remove accumulated dirt. Simultaneously, an electric motor drives the suction tube to spiral along the axial direction. The combined axial and rotational movements of the suction tube ensure comprehensive cleaning of the entire inner surface of the screen. This rinsing process typically lasts only a few tens of seconds. Upon completion, the discharge valve closes, and the filter is primed for the next flushing cycle.

Sucking self-cleaning filter

The Sucking self-cleaning filter operates automatically to filter raw water, clean the screen, and discharge dirt without manual intervention. The entire process is fully automated, ensuring uninterrupted water supply. The cleaning and discharging system can be controlled automatically or manually, providing flexibility and convenience in operation.

When water enters the Suction self-cleaning filter through the inlet, it first passes through the coarse screen from outside to inside, filtering out larger impurities. Then, the water enters the fine screen, where smaller impurities are trapped on the inner wall. Clean water flows out from the outlet. As the filtering process progresses, dirt and impurities accumulate on the inner side of the fine screen, creating a pressure difference between the inner and outer sides of the screen.

When the pressure difference at the inlet and outlet reaches a preset value, or after a certain cleaning time, or through manual pre-set, the filter initiates the self-cleaning process. During self-cleaning, no clean water flows. The process consists of two steps: first, the cleaning valve opens, reducing the water pressure in the cleaning chamber and dirt suction device significantly. This creates a suction force between the suction pipe and the cleaning chamber, sucking impurities from the inner surface of the screen. Simultaneously, an external bi-directional motor drives the suction scanner to spiral along the inner surface, thoroughly cleaning it. The entire rinsing process lasts only tens of seconds, and the drain valve closes at the end.

The cleaning method involves motor-driven backwashing and nozzle suction. A motor in the reducer drives the dirt sucker and nozzle to rotate, while the nozzle sucks the inner wall of the fine screen to remove dirt. The filter then prepares for the next flushing cycle. The entire operation is controlled by an intelligent control box, offering various control modes such as differential pressure, time, manual, and PLC control.

Brush type self-cleaning filter

Brush type self-cleaning filter

Brush type self-cleaning