Patent ID: 8047205

Claim:
A device for mixing gases for respirators, the device comprising: a gas storage tank; a first gas source; a first feed line and a first dispensing valve for said first gas source, said first feed line being connected to said gas storage tank and providing a gas flow passage from said first gas source to said gas storage tank via said first dispensing valve; a second gas source; a second feed line and a second dispensing valve for said second gas source, said second feed line being connected to said gas storage tank and providing a gas flow passage from said second gas source to said gas storage tank via said second dispensing valve; a third feed line with a blower for drawing in ambient air, said third feed line being connected to said gas storage tank; a directional valve in said third feed line on an incoming flow side of said gas storage tank, said directional valve making possible a gas flow from said blower into said gas storage tank and interrupting a gas flow from said gas storage tank into said third feed line; a mixed gas line extending from said gas storage tank, said mixed gas line having a mixed gas dispensing valve; a pressure sensing means for sensing gas pressure in said gas storage tank; a control device in functional connection with each of said first dispensing valve and said second dispensing valve, with said blower and with said pressure sensing means, the control device setting a first operating pressure level in said gas storage tank in a first mode of operation with dispensing of gas into said gas storage tank via said first dispensing valve and said second dispensing valve, and operating said blower and lowering the first operating pressure level to a second operating pressure level in a second mode of operation with dispensing of gas into said gas storage tank via said third feed line.