Device for separating solid particles of dirt from cooling water for power stations

Claim 1

In a device for separating solid particles of dirt from the cooling water for steam power plants or other power stations, which device includes a screening drum having opposite ends and disposed statically in a cylindrical casing so as to form an annular chamber therebetween, a cooling water inlet spigot communicating with the interior of said screening drum at one of its ends and generally tangentially thereof for introduction of unfiltered incoming cooling water axially into said screening drum and so as to flow generally helically within said screening drum prior to being filtered and codirectionally generally helically within said annular chamber subsequent to being filtered, a cooling water outlet spigot communicating with said annular chamber generally tangentially of said cylindrical casing, and a dirt particle discharge spigot communicating with the interior of said screening drum at the other end thereof and provided with a valve; the improvement comprising that a baffle is disposed in said annular chamber intermediate said cooling water outlet spigot and the portion of the outer periphery of said screening drum proximate thereto, said baffle extending generally circumferentially of said screening drum over a portion of the outer periphery of the same and having two circumferentially spaced edges, said baffle at one of said edges bearing coaxially against the outer surface of said screening drum and at the other of said edges being spaced from said surface, and the spacing between said baffle and said outer surface of said screening drum increasing as viewed in the direction of helical flow of the cooling water.