Filtering cloth

Abstract

The invention discloses a filtering cloth, which comprises a support net and a filtering layer connected on the forward flushing side of the support net, wherein the filtering layer comprises a plurality of fluffy threads with one end connected to the support net, each fluffy thread comprises a plurality of fluffy yarns, the free ends of the fluffy yarns form a plurality of dispersed monofilamentstates, the free ends of the fluffy threads are bent toward the support net and are mutually overlapped under the forward flushing action of a filtered water flow, and a bending flowing filtering channel with a plurality of corners is formed between the mutually overlapped floppy threads. According to the present invention, the filtering cloth is convenient to clean, such that the filtering clothcan be repeatedly used multiple times so as to prolong the replacement cycle and save the cost.

Description

technical field [0001] The invention relates to a filter cloth, which is especially suitable for gravity filter facilities with a special structure of suction device. Background technique [0002] The traditional filter cloth is a multi-layer structure with a support net and a filter layer. The filter layer is fixed on the downstream side of the support net (that is, the side where the filtered water to be filtered flows and impacts the filter cloth), and has The horizontal and vertical lines overlap up and down and form a curved through-flow channel with a plurality of corners. In these through-flow channels, the solid particles to be filtered out are trapped and stick to the walls of the through-flow channels. The filter layer is often made of needle felt or random textured non-woven fabric. The flow resistance of this filter layer is relatively large, and as the flow channel in the filter layer becomes more and more blocked, the flow resistance increases rapidly, and mo...

AI Technical Summary

Problems solved by technology

However, due to the limitation of the filter structure of the filter cloth made of felt or non-woven fabric, it is difficult to quickly rinse the intercepted solid particles on it when backwashing, and because the through-flow channel in the filter layer is tortuous, The flow rate of the flushing water flow during backwashing is too slow, which also makes it more difficult to clean the filter cloth. If the flow rate of the backwashing water flow is actively increased, it may cause direct damage to the filter cloth

[0004] Therefore, the filter cloth of the filter layer made of felt or non-woven fabric cannot be washed several times and must be replaced after a relatively short operating time

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