The utility model discloses a filter core, including the shell, its inside
solid setting has the central tube and
spiral flow guide plate, the central tube is along the axis of shell and is arranged, and the water outlet cavity is formed in the central tube, and the lateral wall of water outlet cavity is equipped with a plurality of water passing holes along the circumference, and the
spiral flow guide plate is connected between the outer wall of central tube and the inner wall of shell, and
spiral flow guide plate extends along the axis direction of shell spiral, to make the outer wall of central tube, the inner wall of shell and the spiral flow guide plate between the spiral cavity way, and the lower extreme of shell is equipped with a plurality of water inlet holes, and spiral cavity way is connected with water inlet hole and water passing hole, and the top of shell is equipped with the water outlet. The utility model discloses the spiral cavity way of forming spiral flow guide plate, and the spiral cavity way of long path must be flowed along to the water outlet from water inlet hole by forced
water flow, and the
water flow can fully contact with the
filter material in the spiral cavity way, can greatly improve the effective contact area of water and
filter material under the prerequisite of not increasing the shell volume, and the
water quality of water outlet is stable and reliable.