Continuous sand filter unit

Abstract

The invention discloses a continuous sand filter unit which comprises a barrel, a sand bed, a raw water inlet unit, a purified water outlet unit, a sand washing barrel, a sand lifting assembly and a sewage outlet unit, wherein the upper end of the barrel takes the shape of a straight wall and the lower end of the barrel takes the shape of a cone; the sand bed is arranged inside the barrel and extends upwards from the bottom of the barrel along the straight wall part of the barrel; the raw water inlet unit is connected with the lower end of the sand bed; raw water enters the barrel through the raw water inlet unit and is filtered by the sand bed; the purified water outlet unit is connected with the barrel and is used for draining purified water out of the barrel, which is obtained after the raw water is filtered by the sand bed; the sand washing barrel is arranged at the upper end of the barrel and is used for washing dirty sand entering the sand washing barrel; the bottom of the sand washing barrel is connected with the sand bed; the sand lifting assembly is used for lifting the dirty sand at the bottom of the barrel to the top of the sand washing barrel; the sewage outlet unit is used for draining sewage formed in the process of washing the dirty sand out of the sand washing barrel. According to the invention, the dirty sand at the bottom of the sand bed can be automatically washed and the washed filter sand is supplemented to the top of the sand bed; the circulating filter sand is subjected to washing processing; the height of the sand bed can be kept stable.

Description

technical field [0001] The invention relates to the technical field of water filtration and purification, in particular to a continuous sand filter device. Background technique [0002] The sand beds of existing sand filter equipment are mostly fixed. After the sand filter equipment is used for a period of time, granular or flocculent impurities will remain in the filter sand. If the impurities are not removed in time, the filtration will be affected. Speed ​​and filtration quality, so it is necessary to regularly clean the filter sand to remove the intercepted matter on the filter medium. Periodic shutdown cleaning has a great impact on the filtration efficiency, and the cost is correspondingly increased a lot. [0003] The filter sand of the existing continuous sand filter device is not continuous, and the sand deposited at the bottom of the existing continuous sand filter device cannot return to the sand layer in time, and the sand layer is easy to accumulate higher, and ...

AI Technical Summary

Problems solved by technology

[0002] The sand beds of existing sand filter equipment are mostly fixed. After the sand filter equipment is used for a period of time, granular or flocculent impurities will remain in the filter sand. If the impurities are not removed in time, the filtration will be affected. Speed ​​and filtration quality, so it is necessary to regularly clean the filter sand to remove the intercepted matter on the filter medium. Periodic shutdown cleaning will have a great impact on the filtration efficiency, and the cost will increase a lot accordingly.

[0003] The filter sand of the existing continuous sand filter device is not continuous, and the sand deposited at the bottom of the existing continuous sand filter device cannot return to the sand layer in time, and the sand layer is easy to accumulate higher, and it will be washed from the upward cleaning water. Into the sewage drainage pipe and out of the sand filter device, on the one hand, the existing continuous sand filter device requires frequent sand replenishment, resulting in labor and economic waste

On the other hand, after the filter sand enters the pipeline with the sand washing sewage, it will cause the filter sand to deposit in the pipeline and block the pipeline.

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