4. Flexible Configuration: The Straight Through Backwash Filter offers a variety of configurations to suit different applications. Its flexible materials, combinable components, and adjustable control parameters make it versatile for use in various industries.
5. Large Handling Capacity: With a maximum handling flow rate of up to 8000m³/h, this filter can efficiently manage large volumes of liquid, making it ideal for large-scale industrial operations.
During the filtration process, liquid enters the filter from its inlet. A portion of the liquid flows directly into the filter from the lower end of the filter element, while the remainder enters the top of the filter through a middle splitter pipe and then flows into the upper end of the filter screen. The liquid simultaneously flows into the upper and lower openings of the filter screen, passes through its inner surface, and collects at the outlet before flowing out.
Particle impurities are intercepted on the inner surface of the filter screen and accumulate into a filter cake. As the filter cake thickens, the pressure difference between the inlet and outlet gradually increases, indicating a decrease in the filter screen's flux.
When the pressure difference between the inlet and outlet reaches a set value or a preset time is reached, the electric control box sends a signal to initiate the backwash process. The drain valve opens, the
water flow guide valve closes, and the impurities stuck on the inner wall of the filter screen are washed away by the water flow.
During the backwash process, the water flow guide valve is fully closed, forcing the water flow to enter the outside of the filter screen from the mesh in the inlet section of the filter. Most of the clean liquid flows out from the outlet, while a portion enters the inside of the filter screen from the outside (due to a pressure relief state where the internal pressure of the filter screen is lower than the external pressure). This action backwashes the filter screen, removing any impurities from its smooth inner wall.
The special structure of the stainless steel wedge-shaped filter screen creates a spray effect inside the filter screen, ensuring that all impurities are flushed away. When the pressure difference between the inlet and outlet returns to normal or the timer set time expires, the electric drain valve closes, and the water flow guide valve opens, completing the entire flushing process without downtime.
The Straight Through Backwash Filter also features a positioning function that ensures precise alignment of the cleaning arm with the filter elements. A positioning disk and cleaning arm are installed on the drive shaft driven by the reduction motor. Each positioning hole on the positioning disk corresponds to each filter element.
When the positioning hole aligns with the positioning sensor's sensing channel, the positioning sensor outputs a signal to stop the motor. The cleaning arm is then aligned with a filter element, and the backwash valve opens for a few seconds before closing, completing the cleaning cycle. The motor continues to run, and the next positioning hole aligns with the positioning sensor, stopping the motor to clean the next filter element. This process repeats until all filter elements have been cleaned.
Applications
1. Chemical processing plants
2. Petroleum refining facilities
3. Power generation stations
4. Water treatment plants
5. Food and beverage production
6. Pharmaceutical manufacturing
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