| 摘要 |
PROBLEM TO BE SOLVED: To provide the structure of an air passage switching device 7 capable of preventing air from leaking between a first and a second passages 7b, 7c without increasing airflow resistance, and of restraining reduction in air flow. SOLUTION: A substantially inverted C-type groove 8c is formed across axial passage width W in a shaft 8a facing the end 9a of a divider, and the end 9a is protruded in the inverted C-type groove 8c across the substantially axial passage width W so that the wall surface of the substantially inverted C-type groove 8c and the side wall of the end 9a may come into contact with each other when a door 8 is placed at a totally-enclosed rotating end. A seal is put around the shaft 8a even if a conventional trim 9b is eliminated, so that the leakage of air can be prevented between the first and the second passages 7b, 7c, and airflow resistance can be reduced because the trim 9b conventionally overhanging into the first and the second passages 7b, 7c is eliminated and the thickness is only of the door 8, thereby restraining reduction in the air flow in the air passage switching device 7.
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