Back-flush-type preposed water filter

Abstract

The invention provides a back-flush-type preposed water filter. The back-flush-type preposed water filter comprises a water inlet, a water outlet, a shell, a filter screen and a water flow direction conversion device, wherein a filter cavity body is defined by the shell, and water flowing from the water inlet passes through the filter cavity body, and then flows out of the water outlet; the filter screen is arranged in the shell and separates the filter cavity body into an internal filter cavity body and an external filter cavity body, and water flows between the internal filter cavity body and the external filter cavity body through the filter screen; the water flow direction conversion device enables water flow to be converted between normal filter operation and back flush operation; when the water flow direction conversion device is converted to the normal filter operation, water flowing from the water inlet is filtered by the filter screen from the internal filter cavity body, enters the external filter cavity body, and flows out of the water outlet; when the water flow direction conversion device is converted to the back flush operation, water flowing from the water inlet flows to the internal filter cavity body through the filter screen from the external filter cavity body, and flushes impurities adhering to the filter screen, thereby flushing the filter screen.

Description

technical field [0001] The invention relates to the field of daily life appliances, in particular to a backwash type pre-water filter for domestic drinking water. Background technique [0002] The household water filter is usually installed after the water meter on the main water inlet pipe of the household, and is mainly used to intercept particulate impurities, sediment and rust in the tap water. The role of this water filter is to protect downstream water equipment such as dishwashers and direct drinking water filters with higher filtration accuracy. At present, in the market, in addition to the filter element disposable household water filter, there are also many types of non-disposable household water filters. Generally, these non-disposable household water filters basically use stainless steel mesh as the filter. medium. Generally, these non-disposable household water filters use various structures to perform periodic flushing operations on the stainless steel screen...

AI Technical Summary

Problems solved by technology

In the technical solutions disclosed in the above-mentioned patent documents, air pressure is used to flush the filter screen on the filter, but due to the limited strength of the provided air pressure, the flushing effect on the filter screen is not ideal

[0007] The filter devices disclosed in the above-mentioned patent documents, in addition to their own deficiencies and disadvantages, have the following common problems at the same time, that is, if the flushing water flow is the same as the water flow in the normal filtration process, the impurities on the filter screen cannot be effectively removed. is washed down, thus making the filter a breeding ground for bacteria

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