The utility model relates to a filter, in particular to a high-efficiency water purification filter.
The water purification filter includes a filter tank composed of a cylinder body and an upper and a lower head, the upper and lower ends are provided with the water inlet and outlet pipes, and the upper part of the tank is provided with a partition.
The bottom is provided with a filter screen, the middle is filled with suspended filter material, and a filter material flushing nozzle is provided.
The turbid water flows in from the water inlet pipe at the bottom of the filter tank and flows evenly and smoothly through the suspended filter material, and the filtered purified water flows out from the water outlet pipe at the top of the filter tank through the filter head (filter nozzle) set on the bottom surface of the clapboard.
When backwashing the suspended filter material, turn on the flushing nozzle, and the backwashed water flows out from the water inlet pipe through the backwash filter screen.
The filtering area of this filter is equal to the cross-sectional area of the cylinder, that is, Fθ=πD2/4, and D is the diameter of the cylinder. The turbid water flows through the suspended filter material smoothly and evenly, and the flow velocity of each cross section of the filter layer is equal.
When the turbid water passes through the filter layer from bottom to top, a large amount of suspended impurities are retained by the bottom of the filter layer, and only a small amount of small particles of suspended impurities penetrate the bottom layer to reach the middle of the filter layer.
With the prolongation of filtration time, more and more turbidity is retained at the bottom of the filter layer, and the head loss of water flow increases faster and faster. A given head loss tolerance is reached very quickly.
The filter layer needs backwashing to complete a filtration cycle. At this time, the bottom of the filter layer contains a large amount of dirt, while the upper portion of the filter layer contains a small amount of dirt, and the average dirt content of the filter layer is not large. Resulting in the low filtration efficiency of this filter.
The purpose of the utility model is to provide high-efficiency water purifying filter with a large filtering area and high dirt content of the filtering material, that is, high filtering efficiency.
The filtration rate of the outer wall of the central water distribution pipe is the highest, the filtration rate of the water collection pipe wall is the lowest, and the lower filtration rate of the outer ring prevents impurities with small particle size in the turbid water from penetrating the filter layer, ensuring the quality of pure water.
The higher filtration rate of the inner ring can also make the suspension in the turbid water penetrate the thicker filter layer. With the extension of time, the inner ring of the filter layer retains the large-diameter suspended solids, the middle ring retains the large and medium-sized suspended solids, and the outer ring retains the small-diameter suspended solids.
When the water head loss of the filter layer reaches a given value, the filter layer has completed a filtration cycle, and most of the filter layers will have more dirt at this time. The filter layer contains a large amount of pollution, which increases the pollution content of the entire filter layer.
Compared with ordinary filters, the water head loss is much smaller when the average pollution content of the filter layer is the same. When the water head loss is equal, the average pollution content of the filter layer is greatly improved.
Due to the above two reasons, the utility model has high filtration efficiency and low self-consumption of water.