Filter

Abstract

The invention discloses a filter, and relates to the field of irrigation equipment. By adopting the filter, the inner and outer walls of a filter screen can be cleaned automatically, and meanwhile the pollutants around the filter after cleaning can be discharged. The filter has the main technical scheme: the filter comprises a rack, a filter screen cylinder, a backwashing device and a pollutant discharge device, wherein the filter screen cylinder comprises a barrel-shaped filter screen and water seal covers at two ends; the filter screen cylinder is installed on the rack; the backwashing device comprises a backwashing water taking pipe and a backwashing water exhaust pipe; a water taking opening of the backwashing water taking pipe is installed in the filter screen cylinder; the backwashing water exhaust pipe extends into the filter screen cylinder; a preset distance is formed between the water outlet of the backwashing water outlet and the bottom of the inner surface of the filter screen cylinder; the pollutant discharge device comprises a pollutant discharge pipe and a group of pollutant absorption nozzles arranged on the pollutant exhaust pipe; the pollutant absorption nozzles are arranged on the bottom of the outer surface of the filter screen cylinder. The filter can backwash the inner and outer wall of the filter screen cylinder, and can discharge the pollutants at the bottom of the filter screen cylinder after backwashing so as to guarantee the efficient operation and no blocking of the filter.

Description

technical field [0001] The invention relates to the field of irrigation equipment, in particular to a filter. Background technique [0002] For areas with water shortages, most crops are irrigated with drip irrigation belts, but general agricultural irrigation water has more pollutants. The main pollutants include: soil, sand, plant residues, leaves, mineral debris, plastic film debris, etc. Physical pollutants and organic pollutants such as sticky secretions produced by the growth of bacteria, fungi, etc., and the water in the drip irrigation belt needs to be filtered to a certain standard before it can be used, otherwise the drip irrigation belt will be blocked. [0003] At present, there are three main ways to filter agricultural irrigation water: natural sedimentation, sand and gravel filtration, and mesh filtration. Natural settlement requires the construction of a large pool, and it will take a certain period of time for soil, sand, mineral debris and other debris wit...

AI Technical Summary

Problems solved by technology

Natural settlement requires the construction of a large pool, and it will take a certain period of time for soil, sand, mineral debris and other debris with a specific gravity greater than water to settle at the bottom of the pool. However, when a large amount of agricultural water is needed in summer, it cannot meet the water consumption. Organic organisms suspended in water, plastic films, algae and other substances with a specific gravity smaller than water cannot be effectively removed, and the cost of building a large pool is high; sand and gravel filtration is generally filtered through a pressure vessel equipped with sand and gravel, due to the limitation of the capacity of the pressure vessel , the efficiency of water treatment is low, and the pollutants in the pressure vessel cause poor self-cleaning effect of the equipment, requiring frequent backwashing

There are two types of screen filters at this stage. The first is that water is filtered from the inside of the filter cylinder to the outside of the filter cylinder, and the other is that water is filtered from the outside of the filter cylinder to the inside of the filter cylinder. For the first type The screen filter has a self-cleaning device. During the backwashing process, some impurities will adhere to the inner wall of the filter screen. The impurities attached to the inner wall of the filter screen after being washed by the high-pressure nozzle will be more difficult to remove. During the washing process, the outer surface of the filter screen becomes a blind area for washing, and the impurities attached to the outer wall of the filter screen cannot be removed, which seriously affects the self-cleaning effect of the filter screen; another type of screen filter also has a self-cleaning device, but after cleaning Pollutants settle at the bottom of the filter device or float around the filter device, and accumulate to a certain extent, the water quality around the filter screen will become extremely poor, and these pollutants will still block the filter screen

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