Particle-from-gas separators

Claim 1

A PARTICLE-FROM-GAS SEPARATOR, COMPRISING A VESSEL STRUCTURE DEFINING VESSEL WALLS AND A GENERALLY VERTICAL AXIS AND FORMING A CENTRIFUGAL-ACTION SEPARATOR CHAMBER OF CIRCULAR HORIZONTAL CROSS SECTION, SAID CHAMBER HAVING A BOTTOM PORTION, MEANS FORMING A MAIN INLET DUCT HAVING AN OPENING COMMUNICATING WITH SAID CHAMBER FOR SUPPLYING A PRIMARY FLOW OF PARTICLE-LADEN GAS TO SAID CHAMBER, SAID MAIN INLET DUCT MEANS INCLUDING MEANS FOR PROVIDING ROTATING MOTION TO THE GAS ENTERING SAD SEPARATOR CHAMBER, MEANS FORMING A GAS OUTLET PORTION COMMUNICATING ABOVE SAID MAIN INLET DUCT WITH SAID CHAMBER AND EXTENDING UPWARDLY AWAY FROM SAID CHAMBER, SECONDARY GAS SUPPLY MEANS FOR SUPPLYING AN ADDITIONAL QUANTITY OF GAS TO SAID VESSEL STRUCTURE AND MOUNTED TANGENTIALLY ON SAID GAS OUTLET PORTION AND ANGULARLY INCLINED DOWNWARDLY RELATIVE TO SAID AXIS SO AS TO DISCHARGE SECONDARY GAS INTO SAID GAS OUTLET PORTION AND AGAINST THE DIRECTION OF SAID PRIMARY GAS FLOW SO AS TO PRODUCE A VORTEX SINK AND A VORTEX SOURCE IN THE PRIMARY GAS FLOW AND SO AS TO SUPERIMPOSE A CIRCULATORY FLOW ON SAID PRIMARY GAS FLOW, AND UPWARDLY TAPERING MEANS COAXIALLY LOCATED WITHIN SAID VESSEL STRUCTURE ABOVE SAID INLET OPENING AND INCLUDING AN ANNULAR INSERT STRUCTURE FORMING WITH SAID VESSEL WALLS AN ANNULAR COLLECTING SPACE FOR RECEIVING DUST PARTICLES.