| 摘要 |
PROBLEM TO BE SOLVED: To provide an ejector which improves a gas flow rate controllability in a low flow rate range. SOLUTION: The ejector 50 includes a needle 70, and a nozzle 80 for storing the needle 70 inside for having a hydrogen gas introduced into a first fluid chamber 63 flow in the gap with respect to the needle 70 for ejecting the same from a discharge port 84. The flow rate of the hydrogen gas ejected from the nozzle 80 is adjusted by relatively moving the tip end 71 of the needle 70 and the discharge port 84 of the nozzle 80 based on the pressure of a cathode gas introduced into a third fluid chamber 64. A tapered part 86 tapered toward the discharge port 84 is formed in the nozzle channel 83 of the nozzle 80 for storing the needle 70 and forming the discharge port 84. An O-ring 76 is provided in the tip end 71 of the needle 70. When the tip end 71 of the needle 70 and the discharge port 84 of the nozzle 80 are moved relatively to such a direction that they approach with each other, the O-ring 76 comes in contact with the tapered part 86 for blocking the nozzle channel 83. COPYRIGHT: (C)2011,JPO&INPIT
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