| 摘要 |
PURPOSE:To make the exhaust gas uniform and obtain for sure regulation in the direction of the exhaust and at the same time prevent wrong fitting in the exhaust opening by incorporation in an exhaust opening a plurality of louvres which have an inclination angle in a specific direction and at its lower end a claw section which crosses locally the upper end of an exhaust cylinder. CONSTITUTION:An exhaust cylinder 13 is provided with an upper end projection section 17 and an exhaust opening 4 is provided with a louvre 15 which has an inclination angle of alpha deg. and claw sections 16 and 16' at the lower side of the louvre 15. An exhaust gas discharged from the upper section (b) of the exhaust cylinder reaches a plurality of vertical faces of the louvre 15 at an exhaust opening 4 and travels along the inclined face and leaves the exhaust opening 4 at an angle alpha deg.. Ascending air flow of a low temperature at the periphery (a) of the exhaust cylinder 13 is exhausted out of the exhaust opening 4 from between the side wall of the exhaust opening 4 and the louvre 15. The claw sections 16 at the lower side of the louvre develops a crossing allowance dimension D with the adjacent claw section 16' so that it also has a dimension to cross in the up-and-down direction the upper projection section 17 which projects sideway from the exhaust cylinder 13. When the exhaust opening 4 is removed with its front and rear reversed and reassembled, the claw section 16 and 16' and the upper end projection section 17 of the exhaust cylinder 13 cross, so that it is impossible to refit the exhaust opening 4.
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