Automatic Backwashing Filter

    The automatic backwashing filter series is designed to remove particulate impurities from high-flow, high-velocity and low-viscosity fluids. As an electromechanical integrated product, JOECHR Eautomatic backwashing filter features optimized design, high filtration efficiency and low operating cost. It maintains continuous filtration during backwashing and is widely applied in metallurgy, chemical industry, power generation, oilfield reinjection water, ship ballast water, environmental water treatment and other industries.
Application Fields
Seawater desalination, circulating cooling water, oilfield reinjection water, marine ballast water, boiler recycled water, pre-filtration for ultrafiltration and reverse osmosis, pretreatment for ion exchange, nozzle filtration for papermaking industry, etc.
Working Principle
To-be-filtered fluid enters the filter via the inlet, passes through the lower fixing plate and flows into filter screens. The fluid flows from the inner side to the outer side of filter screens and exits through the filter cartridge outlet, while intercepted contaminants are discharged from the drain outlet during backwashing.
Process Description
As fluid flows outward through the filter screen, solid particles are trapped on the inner screen surface. Accumulated contaminants gradually raise the differential pressure between the contaminated side and clean side of the filter. Once the differential pressure hits the preset value, the differential pressure gauge sends a signal to trigger automatic backwashing.
Backwashing Procedures
1.The reduction motor drives the backwash arm via intermediate shaft to rotate and align with the filter screen to be cleaned.
2.The drain valve opens to create a pressure differential between the clean outer side of the targeted screen and the drain pipeline.
3.Driven by the pressure difference, clean fluid reversely flows from outside to inside of the filter screen to complete backwashing; accumulated contaminants on the inner screen are flushed away and drained out of the filter.
4.Backwash duration for each screen is preset. Upon expiry of the set time, the drain valve closes to finish cleaning of the current screen. The reduction motor rotates the backwash arm again to align with the next set of screens, followed by valve opening for sequential backwashing of all screens.
5.After all filter screens are cleaned, the backwash arm returns to its home position controlled by a photoelectric switch, marking the completion of one full backwash cycle.
6.Since screens are cleaned group by group, the filter keeps uninterrupted filtration throughout the backwash cycle.
Backwash Parameter Settings
一、Differential Pressure Setting: Equipped with an adjustable differential pressure gauge for threshold configuration.
二、Time Setting: The control cabinet is fitted with a timing module to customize backwash cycle per user demand. Pressure setting prevails when both pressure and timing triggers are enabled.
三、Manual Activation: A TEST button is available for manual backwash startup during equipment commissioning and maintenance, apart from automatic pressure and timing-based operation.
Design Features of Automatic Filter
1.Patented internal mechanical structure enables thorough backwashing with zero cleaning dead corners, complete impurity removal, stable flow rate without attenuation, guaranteed filtration efficiency and extended service life.
2.Wedge wire screens made of 304, 316L, 2205, MONEL and other alloys deliver high mechanical strength, superior precision and corrosion resistance, with minimum filtration precision down to 25 microns.
3.Built-in self-monitoring and adaptive functions realize fully automatic backwash to accommodate fluctuating water quality without manual operation.
4.Responsive and precise control system allows flexible adjustment of backwash differential pressure and cycle time for diverse water sources and filtration grades.
5.Filter screens are cleaned one group at a time during backwashing; remaining screens stay in normal filtration to guarantee stable operation.
6.Pneumatic drain valve shortens backwash duration and reduces backwash water consumption for cost-effective and eco-friendly performance.
7.Compact and rational layout minimizes floor space and facilitates convenient installation and relocation.
8.Few wearing parts and no consumables cut maintenance cost and simplify daily operation and management.
9.Operating status is displayed on a touch screen for intuitive and convenient differential pressure and time parameter setup.