| 主权项 |
1. A fuel injector for injecting a gaseous fuel, comprising:
a nozzle having an outlet which injects the gaseous fuel at a flow rate greater than or equal to a predetermined rate; and a housing having a mixing chamber which communicates with the outlet, wherein the housing further has at least one air introducing passage which introduces an outer air into the mixing chamber and an injection hole which injects an air-mixed fuel formed by mixing the gaseous fuel with the outer air the air introducing passage has an inlet portion and an outlet portion, the inlet portion of the air introducing passage is opened on an outer wall of the housing, the outlet portion of the air introducing passage is opened to an interior of the housing, and a flow sectional area of the air introducing passage continuously decreases in a flowing direction of the outer air through the air introducing passage such that a flow sectional area of the inlet portion that is opened on the interior of the housing is greater than a flow sectional area of the outlet portion that is opened to an interior of the housing, wherein the housing is configured to make the outer air spirally flow in the mixing chamber and be introduced to the injection hole, the mixing chamber is provided with a cone member which is cone-shaped along an axial center of the nozzle so that a diameter of a sectional area of the cone member increases in the flowing direction, the cone member has a side surface and a spiral groove, and the spiral groove is provided on the side surface to extend in the flowing direction, and the air introducing passage is provided so that the outer air is directed to a position shifted by a predetermined amount from an axial center of the nozzle. |
