| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent deposits from adhering in a nozzle portion by controlling increase in the temperature of the nozzle portion without melting and damageing a seal member. Ž<P>SOLUTION: An annular groove 2b is formed at the tip end portion of a nozzle portion 2. A heat resistant annular seal member 12 of polytetrafluoroethylene or the like is mounted to this annular groove 2b. An annular heat resistant protection member 13 such as a stainless steel covering the tip end face 12b of the annular seal member 12 and having an exposure protection part 13a for preventing the annular seal member 12 from being exposed to fuel gas is mounted to a further tip end side of the nozzel portion than the annular seal member 12. The exposure protection part 13a prevents the annular seal member 12 from being melted and damaged, and the invasion of the fuel gas into the tip end side of the outer periphery 2a of the nozzle portion 2 is avoided by the annular seal member 12. The annular heat resistant protection member 13 is formed into a two-divisional structure comprising a convex divided piece 13c and a concave divided piece 13d, in which an axial line orthogonal division surface 13f is provided, thereby avoiding leakage of the fuel gas at the axial line orthogonal division surface 13f, and facilitating the mounting to the annular groove 2b of the nozzle portion 2. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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