Centrifugal dust separator

Claim 1

A DUST SEPARATOR FOR A DIRTY GAS STREAM COMPRISING: (A) A HOUSING HAVING DIRTY GAS INLET MEANS AND CLEAN GAS OUTLET MEANS; (B) PARTITION MEANS DISPOSED WITHIN SAID HOUSING TO DIVIDE SAID HOUSING INTO A PRIMARY CHAMBER COMMUNICATING WITH SAID DIRTY GAS INLET MEANS AND SAID CLEAN GAS OUTLET MEANS AND A SECONDARY CHAMBER ADJACENT SAID PRIMARY CHAMBER; (C) SAID PARTITION MEANS HAVING A PASSAGEWAY THEREIN BETWEEN SAID PRIMARY AND SAID SECONDARY CHAMBER; AND, (D) A SEMI-AXIAL FLOW-TYPE IMPELLER MEANS COMPLETELY DISPOSED WITHIN SAID HOUSING INTERMEDIATE SAID DIRTY GAS OUTLET AND SAID CLEAN GAS OUTLET THEREOF TO SERVE AS THE SOLE PRIME MOVER AND CENTRIFUGAL SEPARATOR FOR SAID DIRTY GAS STREAM, SAID IMPELLER MEANS COOPERATING WITH SAID HOUSING TO MOVE SAID DIRTY GAS STREAM THERETHROUGH AS IT SIMULTANEOUSLY CENTRIFUGES AND SEPARATES CONTAMINANT PARTICLES THEREFROM, SAID IMPELLER MEANS HAVING AN INLET SIDE AND ON OUTLET SIDE AND INCLUDING A ROTATABLE HUB MEMBER DISPOSED IN SAID PRIMARY CHAMBER AND SPACED BLADE MEMBERS EXTENDING RADIALLY FROM SAID HUB MEMBER; (E) SAID BLADE MEMBERS BEING RADIALLY DIMENSIONED TO EXTEND THROUGH SAID PASSAGEWAY SO THAT SAID OUTER PORTIONS OF THE UPSTREAM AND DOWNSTREAM EDGES OF SAID BLADE MEMBERS FALL WITHIN SAID SECONDARY CHAMBER WITH THE DIAMETER OF SAID OUTLET SIDE OF SAID IMPELLER MEANS BEING GREATER THAN THE DIAMETER OF SAID INLET SIDE SO THAT THE GAS PRESSURE AT THE INLET SIDE IS LESS THAN AT THE OUTLET SIDE DURING ROTATIONAL OPERATION TO MAINTAIN A PRESSURE GRADIENT IN SAID SECONDARY CHAMBER WITH THE GAS FLOWING IN SAID SECONDARY CHAMBER FROM SAID OUTLET SIDE TOWARD SAID INLET SIDE WHEREBY CONTAMINANT PARTICLES FROM SAID DIRTY GAS STREAM CENTRIFUGED OUTWARDLY ARE READILY PASSED INTO SAID SECONDARY CHAMBER.