| 摘要 |
PURPOSE:To generate a requisite group of bubbles at a desired depth by providing an underwater depth controlling screw to be connected to a pressure vessel, a control box for detecting the depth by water pressure and controlling a motor for driving the screw, etc. CONSTITUTION:The pressure value detected by a pressure transducer 7 is inputted to an analog memory 11. The set value of a timer can be previously obtained from a relational diagram between the depth of the submerged generator and time. When the generator lowers below the reference values or the water pressure increases, a relay 13 is actuated, the screw 15 set at the upper of the generator is rotated in the normal direction by a motor 14, and the generator is raised. When the generator is raised above the reference value, the screw 15 is rotated in the reverse direction, and the generator is lowered. The starting and direction of rotation of the screw 15 are controlled by a combination of a deviation computing element 12 and the relay 13. |
