Self cleaning filtering apparatus

Claim 1

A self-cleaning apparatus for filtering a liquid comprising: a body having a liquid inlet duct at one end thereof and a filtrate outlet duct at another end thereof; a filtering basket disposed within said body and communicating with said inlet duct to receive therein a liquid to be filtered; at least one rotatable scraper provided within said basket for cleaning said basket; a drain for discharging waste from the interior of said basket, said basket being connected to said drain through a frustro-conical hopper having at least one stirring vane mounted therein; said basket forming, with said body, a peripheral annular space having a radial width and communicating with said outlet duct through an annular opening having a radial width smaller than the radial width of said peripheral annular space, said annular opening being located between said body and said basket, said annular opening forming an annular restriction for reducing the flow and increasing the velocity of liquid passing therethrough towards said outlet duct; said body further including a frusto-conical skirt located between said annular opening and said outlet duct.