Unpowered self-cleaning rainwater filtering method

Abstract

The invention provides a self-cleaning method capable of utilizing a rainwater filter in a rainwater collecting system. The method is characterized in that a spinning water flow is formed in a filtering chamber by the aid of change of the water flow direction, and self-cleaning is performed on a vertically-placed filter net. The method has the benefits as follows: self-cleaning is performed on the filter net by the aid of power produced under the rainwater flowing effect; a swirling flow mode is formed during rainwater filtration, so that multi-stage filtration of gravel, impurities and the like is facilitated; particulate matters with diameters larger than 2 mm can be removed, so that the rainwater cleanliness of the rainwater collecting system is effectively guaranteed.

Description

technical field [0001] The patent of the present invention relates to the technical field of rainwater recovery and utilization, in particular to a method for filtering rainwater without power and self-cleaning. Background technique [0002] Rainwater harvesting and utilization systems are widely used both at home and abroad. When collecting and utilizing rainwater, the primary task is to filter the collected rainwater to remove the mixed leaves, sand and stones and other sundries in the rainwater, so as to facilitate the purification and other treatment processes of the rainwater in the later stage. [0003] At present, the commonly used rainwater filtration device mainly uses plastic mesh to filter the sundries in the rainwater, and the rainwater filtration device needs to be cleaned regularly to ensure its filtering effect. Second, the organic components in the accumulation of sundries are prone to corruption, which will lead to the emission of foul smell, the later coll...

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Problems solved by technology

[0003] Currently commonly used rainwater filter devices mainly use plastic grids to filter debris in rainwater, and the rainwater filter device needs to be cleaned regularly to ensure its filtering effect. There are mainly the following problems: First, the long-term accumulation of filter materials will Second, the organic components in the accumulation of sundries are prone to corruption, which will lead to the emission of foul smell, the later collection of water and the pollution of river water; third, insufficient filtration will lead to the need to pass through the recycled water for reuse. Multiple sedimentation processes; fourth, a large amount of debris accumulated in the grid makes cleaning inconvenient; fifth, the traditional filter usually adopts the top-in and bottom-out mode, and the waste discharge port is at the bottom, which limits the traditional filter to only apply to the rainwater surface deal with

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