| 摘要 |
PROBLEM TO BE SOLVED: To provide an ejector device capable of preventing the lowering of a flow rate of liquid passing through a small-diameter port part by suppressing the obstruction of a liquid flow due to a stepped surface portion.SOLUTION: A body 100 of an ejector device 4 has a stepped surface portion 502 formed around a small-diameter passage 403 so as to face a liquid flowing upstream side, and a cylindrical surface 501 for connecting a downstream end of a diameter reduction tapered surface 4021 forming a narrowing passage 402 and an outer periphery of the stepped surface portion 502. A connection passage 500 for connecting the narrowing passage 402 and the small-diameter passage 403 are formed on an inner side of the cylindrical surface 501, and becomes a passage having a fixed passage cross section area in an axial direction. The stepped surface portion 502 is positioned on an outer side than a virtual surface 4021A extending the diameter reduction tapered surface 4021 to a downstream side. |
