Central water purifier and double net positive and negative washing device thereof

Abstract

This application provides a central water purifier and its dual-network forward and reverse flushing device, comprising: a valve head assembly having a flow channel and an inlet and an outlet connected to the flow channel, the valve head assembly including a switching valve disposed at the inlet; a filter bottle connected to the valve head assembly, the filter bottle having a receiving cavity for receiving filtered water, and a drain valve disposed at the bottom of the receiving cavity; a filter assembly including an outer frame, an outer filter screen fitted onto the outer wall of the outer frame, an inner frame, an inner filter screen fitted onto the inner frame, an upper cover assembly, and a lower cover assembly, the outer frame having an installation cavity, a drain outlet, and multiple first water passage holes, the inner frame having an inner cavity and multiple second water passage holes, the upper cover assembly fixedly connecting the outer frame and the inner frame, and the lower cover assembly fixedly connecting the outer frame and the filter bottle; and a piston assembly for sealing and opening the drain outlet. This application employs a two-stage filtration system and a forward and reverse flushing system, resulting in high filtration accuracy, thorough flushing, high flushing efficiency, and cost savings.

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