GAS MIXING DEVICE

摘要

Disclosed is a gas mixing device, wherein component gas flows smoothly into a pipe in which diluent gas flows, without the high-speed, high-flow diluent gas flowing backwards towards the pipe in which the low-speed, low-flow component gas flows, and as a result, the concentration of component gas in the mixed gas can be set as desired in a short time period. The gas mixing device (100) is equipped with a double pipe system (1) comprising an outer pipe (11) in which the diluent gas flows and an inner pipe (12) in which a flow outlet (123) formed at the tip opens to the interior of the aforementioned outer pipe (11) and in which the component gas flows, wherein the aforementioned inner pipe (12) comprises a boundary section (124) connecting a base end (121) and the aforementioned tip (122) and has a step formed on the boundary section (124) of the aforementioned base end (121) and the aforementioned tip (122) in a manner such that the outer wall surface of the aforementioned base end (121) is farther out than the outer wall surface of the aforementioned tip (122).