Patent ID: 8507138

Claim:
An ejector for a fuel cell system comprising: an ejector body including an inlet port supplied with fuel gas from a fuel gas supply means, an outlet port communicated with a fuel gas supply passage communicated with a fuel cell, and a suction port communicated with a circulation passage and for suctioning fuel off-gas discharged and returned from the fuel cell; a nozzle having a nozzle hole for discharging fuel gas supplied via the inlet port; a diffuser for mixing the fuel gas discharged from the nozzle hole and a fuel off-gas discharged and returned via the circulation passage from the fuel cell; a nozzle-hole section area regulating mechanism including a needle axially extending in a hollow portion of the nozzle, the nozzle moving forward and backward in the nozzle hole so as to regulate a discharge section area of the nozzle hole; and a bearing member held in the hollow portion of the nozzle and having a through hole through which the needle is movably supported in the axial direction, wherein on a radial circumferential face of the nozzle, there are provided plural fuel gas introduction holes that introduce the fuel gas supplied from the inlet port into the hollow portion of the nozzle.