| 摘要 |
PURPOSE:To make it possible to adjust easily the time of delayed fall of a display valve by providing a groove around the outer periphery of the display valve. CONSTITUTION:Colored liquid 40 with small specific gavity and high viscosity and transparent liquid 41 with large specific gravity and low viscosity are stored in a display cylinder 30, and a display valve 43 is attached on an actuating member 42 in a display cylinder 30. The valve 43 is constituted with a fan shaped valve plate that is made by cutting off a disc and arranged with a specified distance and a circle-shaped connecting member 47 that is attached on the upper face of the valve plate. On the outer periphery of the valve plate a groove 45 is provided and it ordinarily floats on the valve body 41 and displays the valve 43 from the bottom of the display cylinder 30. When excessive electric current flows, the valve 43 is raised by the member 42 and positioned at the upper section of the fluid 40 and displays this. When it returns, the fluid 40 enters the groove 45 from the gap between the valve 43 and the cylinder 30 and produces vortex, and it is further moved upwards above the valve 43 from the gap between the valve 43 and the cylinder 30, lowering the valve 43 with delay. |
