Centrifugal dust separator assembly

Claim 1

A CENTRIFUGAL DUST SEPARATOR HAVING A PLURALITY OF VORTEX CHAMBERS IN SERIES ARRANGEMENT, EACH SAID CHAMBER BEING PROVIDED WITH AN ORIFICE FOR THE OUTFLOW OF DUSTCONTAINING FLUID, SAID SEPARATOR COMPRISING A COMMON DUST COLLECTING CONDUIT FOR SAID CHAMBERS, CONNECTING PASSAGES EXTENDING TANGENTIALLY FROM RESPECTIVE CHAMBERS IN COMMUNICATION WITH THE ORIFICES THEREOF AND OPENING INTO SAID COMMON CONDUIT IN SERIES ARRANGEMENT WHEREBY FLUID MAY FLOW FROM EACH CHAMBER INTO THE CONDUIT WHEREIN THE FLUID FLOWS TOWARD A COMMON OUTLET, ORIFICE PLATES IN SAID PASSAGES HAVING OPENINGS WHICH RESPECTIVELY DIMINISH IN THE DIRECTION OF FLUID FLOW IN THE CONDUIT, SAID CONDUIT HAVING SECTIONS OF STEPWISE INCREASED DIAMETER IN THE DIRCTION OF FLUID FLOW IN THE CONDUIT WHEREIN EACH STEPWISE INCREASE IS PROVIDED PRIOR TO THE LOCATION WHERE THE RESPECTIVE PASSAGES OPEN INTO THE CONDUIT.