Backwash pre-water filter

Abstract

The invention discloses a backwash type front water filter, and belongs to the field of life articles. The backwash type front water filter comprises a cover body and a cylinder body, wherein the cover body is provided with a water inlet and a water outlet, and the cylinder body is connected with the cover body. A filtering cavity is defined in the cylinder body. A filter screen is arranged in the cylinder body and divides the filtering cavity into an inner filtering cavity body and an outer filtering cavity body. The water inlet is communicated with the inner filtering cavity body, and the water outlet is communicated with the outer filtering cavity body. A drain outlet is formed in the bottom of the cylinder body and provided with a drain valve. The drain outlet is communicated with the inner filtering cavity body. A piston plug capable of moving up and down and a partition block for stopping the communication of the water inlet and the water outlet are arranged on the cover body. A circulation channel for making the water outlet end communicated with the water inlet end is arranged on the partition block. By moving the piston plug up and down to block the circulation channel and the inner filtering cavity body respectively, the inflow water flow direction of the water inlet is controlled, the two wash modes of forward wash and backwash can be achieved, and the cleaning efficiency of the filter screen is improved.

Description

technical field [0001] The invention belongs to the field of living appliances, and in particular relates to a backwash type pre-water filter for domestic drinking water. Background technique [0002] The filter screens of the pre-filters all use sintered screens. Since the screens are used for a long time, in the process of filtering impurities in the pipeline, washing the impurities on the screens is a very important technical barrier. At present, there are two flushing methods used by most manufacturers: the first is positive flushing ( figure 1 with figure 2 ), which is the same as the direction and process of product filtration; the second is the reverse direction flushing method ( image 3 with Figure 4 ), flush from the inside and outside of the filter together. [0003] The above two methods are used to flush impurities along the direction of the original filter waterway. The disadvantages of this flushing method are as follows: [0004] 1. The washing directi...

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Problems solved by technology

[0006] In view of the deficiencies in the prior art, the purpose of the present invention is to propose a backwash type pre-water filter, which uses its own structure to change the direction of the incoming water flow to realize the self-cleaning treatment of the filter screen, and is used to solve the problem of backwash waterway and filter waterway. When it is consistent, the problem of low filter cleaning efficiency and incomplete filter cleaning during backwashing

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