| 摘要 |
PURPOSE:To efficiently mix solvents by providing a mixer to the inlet side of a pump, connecting solvent distributing solenoid valves to the inlet of the mixer, housing the respective solvents in reservoirs and providing pressure regulating mechanisms to the respective reservoirs. CONSTITUTION:Gaseous helium is blown to the solvents 1-1-1-3 respectively by opening the respective solenoid valves 18 and after the dissolved air is expelled from the solvents, the valves 18 are closed. The pressure in the reservoirs 10 are thereafter maintained constant by pressure regulating valves 15. The pump 3 and the solenoid valves 2(2-1-2-3) are on-off controlled in such a manner that the concn. ratios of the solvents sucked by the suction stage of one stroke of the pump 3 attains set concn. ratios. The respective solvents 1-1-1-3 are sucked only in the period when the signals V1-V3 of the solenoid valves 3 are on. Since the pressures of the reservoirs 10 are maintained under the specified pressure, the liquid feed performance of the suction and discharge of the pump 3 is maintained normal even if the capacity of the mixer 4 is small; in addition, the solvent mixing with a small delay from the program of the actual change in the concn. and good accuracy is executed. |
