| 摘要 |
PROBLEM TO BE SOLVED: To provide an air passage switching device capable of closing an auxiliary inside air lead-in port when ventilation is stopped in an outside air lead-in mode so as to prevent leakage of the non-conditioned outside air into a cabin from the auxiliary inside air lead-in port in the condition wherein the sub door can not be closed and left as it is opened by the dead weight thereof when arranging an inside air lead-in port nearly horizontally on the top surface side of the inside/outside air switching box. SOLUTION: A first board part is provided with the auxiliary inside air lead-in port and an inside air lead-in sub door capable of opening/closing the auxiliary inside air lead-in port. The inside air lead-in sub door has a second board part for opening/closing the auxiliary inside air lead-in port in one end side of a second turning shaft, and has a weight part in the other end side thereof. When the second board part closes the auxiliary inside air lead-in port with the weight of the weight part in the state that the first board part is in the nearly horizontal attitude and wherein negative pressure is generated inside the inside/outside air switching box, the second board part is turned to the inner side by the negative pressure, and opens the auxiliary inside air lead-in port. COPYRIGHT: (C)2007,JPO&INPIT
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