Patent ID: 8118935

Claim:
A mixing chamber comprising: a stirring chamber for stirring and mixing gases in which two gas-introduction pipes for introducing gases having different masses are arranged in such a manner that the gas-introduction inlets thereof are opposed to one another on a same line, each gas-introduction pipe having an inlet side and a side opposite the inlet side; a diffusion chamber for diffusing a gas mixture formed by the stirring and mixing operations in the stirring chamber; and a partition plate positioned between the stirring chamber and the diffusion chamber in such a manner that the volume of the diffusion chamber is larger than that of the stirring chamber, wherein a gas-supply opening is configured and arranged in the partition plate, wherein the gas mixture obtained in the stirring chamber is allowed to flow into the diffusion chamber through the gas-supply opening, wherein the gas-supply opening is formed in the partition plate substantially on the same line, as seen in plan view, connecting both the gas-introduction inlets, and wherein the gas-supply opening is closer to the opposite side than the inlet side of one of the gas-introduction pipes along the same line.