| 摘要 |
PURPOSE:To reduce the loss of energy, by forming solution area forcedly raised in the circumferential part of feed pipe for feeding a solution from a tank into a cultivation vessel and working descending energy which the raising solution has into the solution in the feed pipe. CONSTITUTION:A tank 1 and cultivation vessel 9 are connected by a discharge valve 11 and a feed pipe 13 which extend from the bottom of the cultivation vessel 9 to the tank 1 and stand in a row. The lower end of the feed pipe 13 is expanded and a trumpet part 14 is wholly formed and a foam generator 15 is arranged in the trumpet 14. A pump 21 is connected to an air trap chamber of pressure vessel 5 and the foam generator 15 by an air pipe 23 and an opening and closing valve 25 for switching air flow is provided to the air pipe 23. A float 31 is provided so as to move according to ascent and descent of the solution face in the tank. |
