Patent ID: 8307993
Filing Date: 2012-11-13
Classification: B01D

Abstract:
1. A filter apparatus comprising: a cylindrical main body container a tubular filter element made of a metal plate, which is provided coaxially with the main body container within the main body container; a plurality of filter holes for removing a foreign material contained in a liquid, said filter holes being formed in the tubular filter element, all or part of said filter holes having a taper shape in which a hole size in an inflow side of a fluid is different from a hole size in an outflow side; a plurality of concavo-convex portions provided in an outer peripheral surface of the filter element around each of the filter holes having the taper shape, said plurality of concavo-convex portions being formed adjacent to one another such that a continuous, repeated concavo-convex structure is formed; an inflow pipe provided in a tangential direction with respect to a circumferential wall surface of the main body container, and introducing the liquid containing a subject to be separated; an outflow pipe causing the liquid filtered by the filter element to flow out; and a foreign material discharge pipe provided in the tangential direction with respect to the circumferential wall surface of the main body container, and discharging the subject to be separated together with the liquid.