| 摘要 |
PROBLEM TO BE SOLVED: To improve design while suppressing increase of ventilation resistance at a suction opening.SOLUTION: A grille (52) is disposed at a lower end portion of an air suction port (51a), and covers a central portion of the air suction port (51a) so that a suction opening (60) is formed between its outer peripheral edge and an opening edge of the air suction port (51a) in a plane view. A plate member (53) is formed into the plate shape extended along an inner periphery of the air suction port (51a), and disposed on an inner periphery of the air suction port (51a) so that its upper edge is positioned at an inner peripheral side with respect to a lower edge, the upper edge is positioned at an upper part with respect to a lower end of the air suction port (51a), and its lower edge surrounds the outer periphery of the grille (52) in a plane view.SELECTED DRAWING: Figure 2 |
