Washing machine and method for backwashing its pre-filter

Abstract

The invention provides a washing machine and a method for back-flushing a pre-filter of the washing machine. The washing machine comprises a circulating water filtering system, the circulating water filtering system comprises the pre-filter and a filtering film assembly arranged on a downstream pipeline of the pre-filter, the pre-filter and the filtering film assembly are configured in a way that during the circulating water filtering flow of the washing machine, and water discharged from a washing cylinder of the washing machine is filtered and then is recycled back to the washing cylinder. The filtering film assembly is further configured in a way that after the circulating water filtering flow and / or the filtering film assembly flushing flow, and residual water in the filtering film assembly is reversely discharged to the pre-filter in a controllable manner in order to carry out back-flushing to the pre-filter. According to the invention, after the circulating water filtering flow, residual water in the filtering film assembly carries out back-flushing to the pre-filter, the water source is reasonably utilized, and a filter screen in the pre-filter can be cleaned to a certain extent.

Description

technical field [0001] The invention relates to a washing machine, in particular to a washing machine with a circulating water filtering system and a method for backwashing a pre-filter in the circulating water filtering system. Background technique [0002] A laundry routine of conventional washing machines usually includes water intake, washing-spin-drying-drainage, multiple rinsing-spin-drying-drainage, etc., wherein washing and each rinse need to consume a large amount of clean water. The water used for washing or rinsing is discharged to the environment outside the washing machine through the drain pipe. The whole washing process consumes a lot of water, which greatly wastes water resources. [0003] In order to achieve the purpose of saving water, the washing water and / or rinsing water of the washing machine can be filtered by the filter membrane module for recycling. However, as the washing times of the washing machine increase, separated substances and some other i...

AI Technical Summary

Problems solved by technology

However, with the increase in washing times of the washing machine, separated substances and some other impurities will gradually accumulate on the surface of the filter membrane, causing blockage and pollution of the filter membrane, which will greatly affect the filtering effect

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