Apparatus for mixing gases in a predetermined ratio particularly for respiratory and medical purpoes

Abstract

Abstract TWO GASES TO BE MIXED ARE INTRODUCED, AT EQUAL PRESSURES, INTO RESPECTIVE CHAMBERS WHOSE VOLUMES HAVE THE DESIRED MIXTURE RATIO. THE GASES CONTINUE TO BE INTRODUCED INTO THE RESPECTIVE CHAMBERS UNTIL THE PRESSURE IN THE CHAMBERS ATTAINS A DESIRED VALUE, AFTER WHICH FLOW OF GASES INTO THE CHAMBERS IS INTERRUPTED AND FLOW OF GASES FROM THE CHAMBERS IS INITIATED. AS THE GASES FLOW FROM THE CHAMBERS, THEY ARE MIXED TO FORM THE GAS MIXTURE. A PRESSURE REDUCER IS CONNECTED TO THE TWO GAS INFLOW LINES TO EQUALIZE THE TWO GAS PRESSURES. A SHUTOFF VALVE IS OPERATIVELY ASSOCIATED WITH EACH INFLOW LINE. BETWEEN THE PRESSURE REDUCER AND RESPECTIVE CHAMBER, A SHUT-OFF VALVE ALSO CONTROLS THE OUTFLOW OF GAS TO A FURTHER PRESSURE EQUALIZING PRESSURE REDUCER VALVE WHOSE OUPUT IS CONNECTED TO A GAS MIXING TANK OR THE LIKE. IN A MODIFICATION, THE PRESSURE REDUCING INFLOW VALVE AND THE SHUT-OFF VALVES ARE COMBINED INTO A SINGLE UNIT. PREFERABLY, MEANS ARE PROVIDED TO ASSURE MAINTENANCE OF EQUAL PRESSURE IN THE TWO CHAMBERS.

Inventors

• 👤 Gunter Dobritz

Bibliographic Details