| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To obtain a duct structure capable of improving moldability of a resin made duct having an exhaust cylinder and reducing ventilation resistance. <P>SOLUTION: The lower case is provided with the exhaust cylinder 13 having an outer peripheral wall 13b which is projectingly provided toward the outside of a chamber from the peripheral edge of the exhaust opening 14 to a bottom wall 11b, an annular flange wall 13c projecting from the outer peripheral wall 13b to an inside of the cylinder, and an inner peripheral wall 13d projecting from the inner edge of the flange wall 13c toward the inside direction of the chamber. The exhaust duct 19 is internally fitted to the outer peripheral wall 13b in such a state that the tip end 19a abuts on the flange wall 13c, and the tip end 13f in the inside direction of the chamber of the inner peripheral wall 13d is disposed further at the chamber outer side than the end edge 13a of the exhaust opening 14. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
