Filtering device

Abstract

The invention discloses a filtering device which comprises a piston rod, a piston sleeve cylinder, a liquid inlet, a liquid outlet, a backwashing opening, a compression spring, a spring movable bottom cover and a liquid drainage groove. The compression spring is fixedly mounted in the piston sleeve cylinder; a liquid inlet is formed in the spring movable bottom cover; the liquid discharge groove is provided with a liquid outlet and a backwashing port; when the piston rod and the piston sleeve cylinder are matched with each other to extract a sample, the sample enters the piston sleeve cylinder from the liquid inlet, and when the piston rod and the piston sleeve cylinder are matched with each other to push the sample, the sample is filtered by a gap between the compression springs, enters the liquid discharge groove and is discharged from the liquid outlet; during cleaning, cleaning liquid enters the liquid discharging groove from the backwashing opening, then enters the piston sleeve cylinder through the gap of the compression spring, and finally is discharged from the liquid inlet, so that the filtering and backwashing effects are achieved.

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