Patent ID: 7338543

Claim:
A gas mixing apparatus comprising: mixing means having a gas inlet at one end side and a gas outlet at the other end side for producing a fuel mixture of a first gas and a second gas; first gas supplying means for supplying said first gas to an outer side of said gas inlet of said mixing means; and second gas supplying means for supplying said second gas to an inner side of said gas inlet of said mixing means, wherein said mixing means includes a plurality of mixing elements disposed parallel to each other and arrayed annularly to define an inner cylindrical space surrounded by said mixing elements, each mixing element has stationary vanes disposed in a circular passage, said fuel mixture of said first gas and said second gas is produced from said gas outlet of said mixing means, said first gas supplying means is disposed outside said mixing means, and said second gas supplying means is accommodated entirely or partly in said inner cylindrical space of said mixing means.