Air-gas mixing device

Abstract

Abstract 1. AN AIR-GAS MIXING DEVICE COMPRISING: A BODY HAVING AN INTERNAL CAVITY, AN AIR INLET PORT, A MIXTURE OUTLET PORT AND A GAS INLET PORT, SAID PORTS OPENING INTO SAID CAVITY; A GAS SUPPLY CONDUIT IN COMMUNICATION WITH THE GAS INLET PORT; A CYLINDRICAL WALL HAVING A CENTRAL AXIS AND BOUNDING A PORTION OF SAID CAVITY; A PISTON HAVING A PAIR OF FACES AND MAKING A FLUID-SEALINF SLIDING FIT WITH SAID CYLINDRICAL WALL, AND RECIPROCABLY MOVABLE THEREIN; A METERING SEELVE, AND A METERING SURFACE ON SAID METERING SLEEVE, AND A METERING SURFACE ON SAID PISTON, SAID METERING SURFACES BEING SO DISPOSED AND ARRANGED RELATIVE TO ONE ANOTHER AS TO FORM A VARIABLE AIR ORIFICE BETWEEN THEM, THE LEAST CLEARANCE OF WHICH EXISTS AT A FIRST PISTON POSITION, THE CLEARANCE OF WHICH EXISTS AT A FIRST PISTON POSITION, THE CLEARANCE INCREASING AS THE PISTON MOVES AXIALLY AWAY FROM SAID FIRST PISTON POSITION, SAID CAVITY BEING DIVIDED AT THE SAID AIR ORIFICE INTO AN UPSTREAM AIR CHAMBER AND A DOWNSTREAM MIXTURE CHAMBER, THE GAS INLET PORT OPENING INTO THE SAID METERING SLEEVE; A GAS VALVE INLET SEAT SURROUNDING SAID GAS INLET PORT NSIDE SAID METERING SLEEVE, AND LYING IN A PLANE NORMAL TO THE AXIS OF THE CYLINDRICAL WALL, AND A GAS VALVE INELT SEAL CARRIED BY THE PISTON SO DISPOSED AND ARRANGED AS TO CLOSE THE GAS VALVE WHEN THE PISTON IS IN THE SAID FIRST POSITION, AND TO OPEN THE GAS VALVE WHEN THE PISTON IS MOVED AWAY FROM THE SAID FIRST POSITION, THE GAS SUPPLY CONDUIT DISCHARGING THROUGH THE GAS VALVE SEAT INTO THE SAID METERING SLEEVE AND THENCE INTO THE MIXTURE CHAMBER, THE AIR INLET PORT OPENING INTO THE AIR CHAMBER, AND THE MIXTURE OUTLET PORT OPENING INTO THE MIXTURE CHAMBER; BIAS MEANS FORCING THE PISTON TOWARD ITS SAID FIRST POSITION; AN ACTUATOR CHAMBER WALL MEMBER EXTENDING ACROSS THE CAVITY AND FACING ONE FACE OF SAID PAIR OF FACES, SAID CHAMBER WALL MEMBER HAVING AN OPENING THERETHROUGH; A SLIDING CLOSURE SURFACE CARRIED BY THE PISTON MAKING A SLIDING FIT IN SAID OPENING, WHEREBY THE SAID CLOSURE SURFACE, ACTUATOR CHAMBER WALL MEMBER, PART OF SAID CYLINDRICAL WALL, AND THE SAID ONE FACE OF THE PISTON DEFINE IN SAID CAVITY AN ACTUATOR CHAMBER WHICH LIES BETWEEN THE AIR CHAMBER AND THE MIXTURE CHAMBER, THE PISTON FACING THE ACTUATOR CHAMBER, AT SAID ONE FACE, AND THE AIR CHAMBER AT THE OTHER FACE OF SAID PISTON, THE DEVICE HAVING AN ACTUATOR PASSAGE INTERCONNECTING THE ACTUATOR CHAMBER WITH THE MIXTURE CHAMBER, THE ACTUATOR CHAMBER WALL MEMBER SHIELDING THE SAIF ONE FACE OF THE PISTON WHICH FACES TOWARD THE ACTUATOR CHAMBER WALL MEMBER FROM THE DIRECT BLAST OF BACKFIRING GASES WHICH MAY ENTER THE MIXTURE OUTLET PORT

Inventors

• 👤 R Baverstock

Bibliographic Details