EXHAUST PORT STRUCTURE FOR FUEL CELL VEHICLE

摘要

PROBLEM TO BE SOLVED: To provide an exhaust port structure for a fuel cell vehicle capable of reducing a hydrogen concentration of an exhaust gas that is exhausted into atmospheric air during initial start and hydrogen purge of the fuel cell vehicle.SOLUTION: The exhaust port structure includes: a re-circulation fluid passage which is fitted in an upper part of an exhaust pipe so as to be in parallel with the exhaust pipe; and a mixing pipe which is fitted in an end of the exhaust pipe and into which external air is sucked. The re-circulation fluid passage is communicated with a suction duct so as to generate a flow of a mixture gas to the re-circulation fluid passage. The mixture gas is re-circulated through the re-circulation fluid passage into the exhaust pipe, and the mixture gas that is re-circulated into the exhaust pipe is mixed with external air via the mixture pipe and exhausted to the outside. If a hydrogen concentration of the mixture gas being present in a connection portion of the exhaust pipe and the re-circulation fluid passage is higher than a hydrogen concentration of the mixture gas that flows into the exhaust pipe, the re-circulation fluid passage and the suction duct are communicated.SELECTED DRAWING: Figure 1