| 摘要 |
<p>PURPOSE:To safely and surely do switching between opening and closing of an air flow passage by a switching valve and to give a long life to the opening and closing operation by adopting a constitution consisting of a worm wheel fitted to a connecting rod for connecting the switching valve and a worm driven and rotated by a motor. CONSTITUTION:The 1st entrance 2 and the 2nd entrance 3 are formed on one face of a casing and the other one respectively, and also the 3rd entrance 4 and the 4th entrance 5 paired with the 1st entrance 2 and the 2nd entrance 3 are formed in the casing, respectively. The 1st switching valve plate 6 for alternatively switching between the 1st entrance 2 and the 2nd entrance 3 and the 2nd switching valve plate 7 for alternatively switching between the 3rd entrance 4 and the 4th entrance 5 are connected by a connecting rod 8 to make them engaged with each other. Further, a worm wheel 9 is fitted to the connecting rod 8 and is rotated in both forward and backward directions by a worm 11 driven by a motor 10 to open and close the 1st switching valve and the 2nd switching valve by the rotation of the connecting rod 8.</p> |
