| 摘要 |
PROBLEM TO BE SOLVED: To easily manufacture a housing having a complicated inside composition.SOLUTION: A gas introduction device 1 is provided with a substantially cylindrical housing 2, an inside partition wall 7 dividing the inside of the housing 2 into an inward side mixing chamber 11 and an outward side outer peripheral passage 10, an outside air introduction pipe 6 introducing outside air G2 to the mixing chamber 11, and a valve mechanism 5 opening and closing a gas introduction passage 4 continuous from the outer peripheral passage 10. The housing 2 is constituted of a first member 21 of a front side of an axial direction and a second member 22 of a rear side of the axial direction. When the first member 21 and the second member 22 are connected in the axial direction, a first small diameter cylindrical part 21Ac and a second small diameter cylinder part 22A are arranged in series, and the inside partition wall 7 is constituted by them. |
