Patent ID: 8480893

Claim:
A gravity-flow water purifier, comprising: a treatment tank comprising a tank wall, an insertion hole, a discharge hole, and a receiving chamber enclosed by the tank wall, the treatment tank further comprising at least two slide rails, the slide rails being mounted on an inner surface of the tank wall and corresponding in position to the insertion hole; a water yielding pipe comprising a pipe wall surrounding an axis and a plurality of through holes penetrating the pipe wall; a filter unit comprising a plurality of filter bags hermetically mounted around the water yielding pipe in a densely packed manner, each said filter bag being perpendicular to the axis and having a central hole in communication with the through holes, wherein when the water yielding pipe is driven to rotate, the filter unit is simultaneously rotated about the axis of the water yielding pipe; and a sliding sleeve unit comprising a reticulated frame, the frame comprising at least two sliding blocks provided on an outer periphery of the frame, an interior space, and an opening at an end of the frame; wherein after the filter unit is installed in the interior space of the frame of the sliding sleeve unit, the sliding sleeve unit is inserted into the insertion hole of the treatment tank by sliding the sliding blocks along the slide rails, such that the sliding sleeve unit and the filter unit are conveniently installed in and can be easily removed from the receiving chamber of the treatment tank.