| 摘要 |
<p>A natural air circulation device for a sightseeing submarine includes a float and an air cover provided on the float. A signal means is mounted on the air cover. The float connects with a right tube and a left tube. Each tube passes the wall of the float joining with the upper end of a first corrugated tube at the lower end. The lower end of the first corrugated tube joins with the upper end of a flexible inner tube. Each inner tube is in sleeve relation with a positioning sleeve. Two U-shape flexible hoses are symmetrically provided between the inner sleeve and the positioning sleeve. The positioning sleeve joins with a second corrugated tube at the lower end. A sightseeing submarine is also provided with above natural air circulation device.</p> |
