Patent ID: 7550219
Filing Date: 2009-06-23
Classification: F04F,H01M,Y02E,Y10T

Abstract:
1. A fuel cell system comprising: a fuel cell; a hydrogen supply source supplying hydrogen to the fuel cell; an ejector unit equipped with more than three ejector sections disposed between the fuel cell and the hydrogen supply source and permitting excess hydrogen, expelled from the fuel cell, among hydrogen supplied to the fuel cell from the hydrogen supply source to be recirculated to the fuel cell; and a shut-off mechanism selectively shutting off hydrogen communicating through at least one of the ejector sections, wherein the ejector unit comprises a housing formed with a hydrogen inlet port, a hydrogen outlet port and a hydrogen recirculation port, and a valve body moveably received in the housing and incorporating the ejector sections, wherein movement of the valve body allows any one of the ejector sections to be selected, wherein the valve body comprises a hydrogen recirculation flow passage communicating with the hydrogen recirculation port, wherein the valve body has a cylindrical shape and received in the housing for a sliding and moving capability along an axis of the valve body, and wherein the ejector sections are disposed in the valve body in communication with the hydrogen recirculation flow passage along a direction in which the valve body slides such that sliding movement of the valve body effectuated in the housing allows either one of the ejector sections to be brought into communication with the hydrogen inlet port and the hydrogen outlet port of the housing.