Patent ID: 8349172

Claim:
A filter and pump unit for the filtering out of particles from a fluid, the filter and pump unit comprising: a filter housing ( 2 ) that bounds a filter space ( 3 ) and has an inlet ( 21 ) and also an outlet ( 22 ) for the fluid to be filtered; a filter element ( 4 ) provided in the filter space ( 3 ), the filter element demarcating an inlet region ( 31 ) from an outlet region ( 32 ) of the filter space ( 3 ), with the inlet region ( 31 ) being in fluid communication with the inlet ( 21 ) and the outlet region ( 32 ) being in fluid communication with the outlet ( 22 ), the filter element ( 4 ) having an axial opening for a flow connection ( 6 ); an impeller ( 5 ) that, as part of a rotary pump, is constructed and arranged to pump the fluid from the inlet ( 21 ) to the inlet region ( 31 ) so that the fluid flows through the filter element ( 4 ) into the outlet region ( 32 ); and the flow connection ( 6 ), the outlet region ( 32 ) being in fluid communication with the impeller ( 5 ) through the flow connection ( 6 ) so that at least a part of the fluid flows back from the outlet region ( 32 ) axially through the flow connection ( 6 ) to the impeller ( 5 ), the flow connection ( 6 ) having a flow resistance, the part of the fluid that flows back to the impeller ( 5 ) being moved by the impeller ( 5 ) to the inlet region ( 31 ).