Back-flush-type water filter

Abstract

The invention discloses a back-flush-type water filter. The back-flush-type water filter comprises a water inlet (16), a water outlet (18), a shell, a filtering unit (3) and a water flow direction conversion mechanism (4), wherein a cavity body (20) is defined by the shell (2), and water flowing from the water inlet flows through the cavity body, and then flows out of the water outlet; the filtering unit (3) is arranged in the cavity body, and comprises at least one first part (32) open toward the cavity body and at least one second part (34) with a filter screen (30); the water flow direction conversion mechanism (4) enables water flow to be converted between normal filter operation and back flush operation; when the water flow direction conversion mechanism is converted to the normal filter operation, water flows to the at least one second part with the filter screen through the filter screen from the at least one first part open toward the cavity body, thereby achieving water filtration; when the water flow direction conversion mechanism is converted to the back flush operation, water flows to the at least one first part open toward the cavity body through the filter screen from the least one second part with the filter screen, thereby flushing impurities deposited on the filter screen.

Description

technical field [0001] The invention relates to the field of daily life appliances, in particular to a backwashing 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 to ac...

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

Images