| 摘要 |
PURPOSE:To enhance the performance of a fuel cell and lengthen the life thereof, by providing a flow rate distribution orifice in a second coupling metal whose potential is higher than that of a first coupling metal, so that the orifice extends near the tip of the second coupling metal opposed to that of the second coupling metal and the distance between the orifice and the tip of the second coupling metal is equal to the inside diameter thereof. CONSTITUTION:A flow rate distribution orifice for improving the balance of flow rates is provided in a cathode metal 35 whose potential is higher than that of an anode metal 34 opposed to the cathode metal in an insulated coupling 27a, so that the distance l between the orifice and the tip of the cathode metal opposed to that of the anode metal is equal to the inside diameter of the cathode metal. No flow rate distribution orifice is provided in another insulated coupling 27b. Since the orifice is provided in the insulated coupling 27a, a corrosion product is caused to cling hear the orifice but not thereto, to suppress the increase in the resistance to the passage of a fluid, which arises from the clinging of the corrosion product. This results in preventing local overheating due to the decrease in the flow rate of cooling water, to enable the very-efficient and stable operation of a fuel cell. |
