| 摘要 |
PURPOSE:To simplify and miniaturize the titled apparatus and to facilitate the maintenance thereof, by performing a process wherein the chemical liquid collected in a metering tank is diluted with fresh water and gas is introduced into an aspirator tube under pressure to completely deliver the diluted chemical liquid and the gas, in a series of operation. CONSTITUTION:When a solenoid opening and closing valve 19 is opened, the chemical liquid in a chemical liquid storage tank 17 is downwardly flowed into a metering tank 1 and, when the chemical liquid level reaches the height of the lower end part of a chemical liquid conduit 18, the flowing-down of the chemical liquid is automatically stopped. When a solenoid opening and closing valve 10 is opened, fresh water is flowed into the metering tank 1 to dilute the previously collected chemical liquid. A float valve 12 rises with the rising in the liquid level of the diluted chemical liquid to stop the flowing-in of fresh water which is, in turn, exclusively flowed to the side of a gas-liquid delivery pipe 7 while the flowing-out from the outer end of the gas-liquid delivery pipe 7 is also stopped with the closing of the solenoid opening and closing valve 10. In the next step, when a solenoid opening and closing valve 5 is opened while a gas pump 6 is operated to introduce gas into an aspirator tube 2 under pressure, the diluted chemical liquid is flowed into an aspirator tube 2 and flowed out along with gas from the outer end of the gas-liquid delivery pipe 7. In this case, a control circuit is provided to automatically and continuously perform the above-mentioned entire operations. |
