| 摘要 |
PURPOSE:To enable a differential pressure between oxygen and hydrogen supplied to a fuel cell to be controlled safely without mixing them by connecting together, both differential pressure controlling valves for controlling a differential pressure between the pressures of supplied oxygen and hydrogen, through a link mechanism. CONSTITUTION:Differential pressure control valves 8 and 9 respectively for oxygen and hydrogen are opened in a proper intermediate degree and their stems are connected to each other through a link mechanism. They are driven in opposite directions according to the movement of the link mechanism. Pressure signals (PH) and (PO) obtained through pressure-detecting elements 16 and 17 installed downstream from differential pressure control valves 8 and 9 are sent to a computer unit 18 where the pressures of the oxygen and the hydrogen sides are compared with each other to obtain an output signal of the operation by which the above link mechanism is driven. Owing to the operation of the link mechanism, the differential pressure control valve on higher pressure side moves toward the closing direction and that on lower pressure side moves toward the opening direction. In addition, even in a state of emergency when a pressure difference becomes over 0.7kg/cm<2> at the time of a sudden change in the supply pressure of oxygen or hydrogen are supplied or supply pressure of either oxygen or hydrogen becomes abnormally high, the pressure can be released by opening either a pressure-releasing device 10 or 11 on higher pressure side. |
