Patent ID: 8201695

Claim:
A lift type pore-controllable fiber filter, comprising: a cylinder type filter tank communicating with a raw water inflow pipe and a back-washing water drain pipe on an upper side thereof and an air inflow pipe on a lower side thereof; a strainer coaxially formed as a porous tub in the filter tank, extending to an outside of the filter tank at a bottom thereof to communicate with a treated water drain pipe, and having a piston guide recessed in an axial direction at an upper portion thereof; a lifting driver including a cylinder fixed above the filter tank by supports, and a piston driven by the cylinder and extending from the cylinder to the piston guide in the filter tank so as to reciprocate; an upper filter material fixing plate having spiral fixing means disposed within a radius smaller than that of the strainer in a central direction, fixed to the piston within the filter tank, and working in collaboration with reciprocation of the piston above the strainer; a lower filter material fixing plate having spiral fixing means disposed within a radius smaller than that of the strainer in a central direction, and fixed below the strainer within the filter tank; and a fiber filter material fixed to the fixing means of the upper and lower filter material fixing plates at upper and lower ends thereof respectively, and forming filtering pore layers on an outer circumference of the strainer.