| 摘要 |
PURPOSE:To lower the lower limit of cooling water flow rate as lower as possible without reducing slit intervals at the outlet of a slit nozzle by specifying the ratio between the inlet slit interval of the nozzle and the outlet slit interval thereof. CONSTITUTION:A nozzle 8 is connected to the bottom discharging port of a water tank 4, and the inlet slit interval (a) at the discharging port side is made to >=3 times the outlet slit interval (b), and the space between these slits is formed into a taper one. That is, cooling water supplied to the tank 4 from the water outflowing holes 7 of a water supplying pipe 5, flows smoothly to the nozzle 8 with the aid of a flow regulating board 6, and an air is therefore prevented from flowing into the nozzle 8 even when the flow rate of cooling water is throttled. The cooling water flows down in a form of continuous plate-like flow from the outlet slits of nozzle 8 onto a high temperature thick steel plate to cool it. |
