Automatic sewage suction micro-irrigation gravel filter

Abstract

The invention provides an automatic sewage suction micro-irrigation gravel filter, which comprises a tank body, a filter layer arranged in the tank body, an inlet and an outlet which are respectively arranged at two sides of the filter layer, and a sewage cleaning assembly which comprises a filter surface close to one side of the inlet, the sewage disposal assembly comprises a detection unit for detecting the pressure difference of the two sides of the filtering surface and a sewage disposal unit connected with the detection unit; the sewage discharging unit comprises a rotating shaft rotationally arranged on the tank body, a driving device used for driving the rotating shaft to rotate around the axis, at least one sewage discharging pipe matched with the filtering surface and a sewage discharging channel communicated with the at least one sewage discharging pipe, and a sewage discharging hole is formed in the sewage discharging pipe; the rotating shaft is perpendicular to the filtering surface of the filtering layer, the blow-off pipe is perpendicularly arranged on the rotating shaft, a blow-off port communicated with the blow-off channel is formed in the tank body, and the blow-off capacity can be improved through the arrangement mode.

Description

technical field [0001] The invention generally relates to the technical field of filters, in particular to an automatic dirt-absorbing micro-irrigation sand and gravel filter. Background technique [0002] Sand filter is one of the most widely used filtration equipment in micro-irrigation projects. It has the characteristics of strong interception ability and convenient filter material cleaning. The sand filter for micro-irrigation uses a certain depth of filter material particles stacked layer by layer to form a porous media sand bed, which is used as a filter carrier for three-dimensional deep filtration. The working process of the sand filter is mainly divided into two stages: filtration and backwashing. Filtration mainly traps impurities on the surface of the filter layer through the filter layer. The backwashing process is generally through the reverse water flow, from bottom to top, the accumulated filter. Laminar fluidization, collision and friction between particles...

AI Technical Summary

Problems solved by technology

This backwash mode based on time and pressure difference between inlet and outlet will cause a large amount of clean water to be discharged with sewage, reducing the efficiency of water resource utilization

At the same time, impurity filter cakes are usually formed on the surface of the filter layer very quickly, and the filtration mechanism of the sand and gravel filter layer changes from deep filtration to surface sieving, the dirt holding capacity is greatly reduced, the pressure difference between the inlet and outlet rises sharply, and the filtration flow rate will also be significantly increased. The decline affects the filtration efficiency. Therefore, the current backwash mode has a big disadvantage, that is, the main dirt-holding layer (top layer) and the secondary dirt-holding layer (bottom layer) are simplified and unified for backwashing each time. , resulting in a longer backwashing time and a very large flow of backwashing water

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