Full-automatic sand filtering device and implementation method thereof

Abstract

The invention discloses a full-automatic sand filtering device. The device comprises a cylinder body, the side of the cylinder body is provided with a water inlet, the water inlet is connected to a water distributor, a water outlet is arranged below the water inlet, the water outlet is connected to a filtering layer, the water distributor is provided with a plurality of water distributor openingsalong the length direction, the filtering layer comprises a water collection main pipe, the water collection main pipe is provided with a plurality of water collection openings along the length direction, one end of the water collection main pipe is connected to the cylinder body, the other end is connected to the water outlet, two sides of the water collection main pipe are respectively providedwith at least two winding tubes along the length direction, the winding tubes are arranged parallel to each other and circumferentially, the sand filtering device is connected to a PLC control systemthrough an automatic valve and through the programmable PLC control system, sand filtration is controlled. Through cooperation of the programmable PLC control system and the high-quality automatic valve, the control method is advanced. The homogeneous filter material prolongs a backwashing period. The multi-point upward water distribution is simple, uniform and reliable and has high filtration efficiency, reliable performances and a long service life.

Description

technical field [0001] The invention relates to a water treatment sand filter device, in particular to a sand filter sand filter device, which belongs to the field of environmental protection equipment. Background technique [0002] Due to the pollution of water resources, people have popularized the use of water treatment equipment in order to protect their health, so that the water quality can reach the standard of health and hygiene. There is an existing sand filter device that enters the raw water to be treated into the sand filter device through the water inlet pipe, distributes it evenly through the bottom water distributor, and then flows upwards against the filter bed. The filtered filtrate is collected at the top of the sand filter device and overflows out of the filter sand device system. Under the action of the air compressor, the air sand lifting pump lifts the polluted dirty sand at the bottom of the sand filter device to the sand washer on the top of the sand ...

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Problems solved by technology

[0003] 1. When backwashing, compressed air must be provided to lift the filter material to the sand washer. In the filtering state, the water flow will exert an upward force on the sand layer. When the upward force of the water flow + the buoyancy of the water on the filter material > the gravity of the filter material, the filter material will float and filter. The material overflows out of the sand filter device from the water outlet with the water flow, and the sand filter device cannot work according to the design requirements due to the loss of filter material;

[0004] 2. When the upward force of the water flow + the buoyancy of the water on the filter material = the gravity of the filter material, the filter material is suspended, the filter material is bulky, the gap between the filter material and the filter material increases, the efficiency of intercepting impurities is low, and the sand filter device cannot work according to the design requirements ;

[0005] 3. The upward force of the water flow is proportional to the filtration speed. The higher the filtration speed, the greater the upward force of the water flow, and vice versa. The water flow rate of the sand filter device = cross-sectional area of ​​the sand filter device × filtration speed, and the treatment flow rate is affected by the upward force of the water flow. Small amount of water, low work efficiency;

[0007] 5. The cleaned filter material sinks from the middle sand washer, making the height of the middle filter material layer of the sand filter device greater than that of the surrounding filter material layer. And vice versa, the filter has a bias flow phenomenon, and the filtering effect is unstable;

[0008] 6. The sand lifting pump cannot adjust the lifting amount of the filter material

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