Patent ID: 10046253

Abstract:
A filtration device including: a casing 1 having a fluid inlet 6, a fluid outlet 7, a raw fluid chamber 8, and a filtered-fluid chamber 9; a box-shaped or tube-shaped filter element 3 (3a, 3b) having a filter medium 31 removably installed inside the casing 1, allowing the fluid to pass through from inside to outside to filter the fluid, and having a backwashing mechanism inside thereof; and a backwash fluid discharge pipe 4 which discharges backwash fluid to the outside, wherein the backwashing mechanism has a fixed pipe 33 fixed to the inside of the filter element, a movable pipe 34 movably fitted to the outside of the fixed pipe, and a backwash head 35 attached to the movable pipe to backwash the filter medium, wherein the fixed pipe and the movable pipe movably guide the backwash head and form a discharge passage for backwash fluid.