| 摘要 |
PURPOSE:To automate an adjustment of a liquid level by providing the upper limit and the lower limit level detectors for jetting a pressure air, and also, accelerating or decelerating a jet pump motor, only when each detector has been operated exceeding a prescribed time. CONSTITUTION:The lower limit level detector 11 and the upper limit level detector 12 of a cylindrical shape are provided, against a solder liquid surface 4a, and also, pressure operating switches 15, 16 are installed to blast pipes 13, 14, respectively. When the liquid surface 4a descends and a pressure air is jetted from an opening part 11a, a pressure switch 15 detects a fact that the liquid surface 4a has descended to the lower limit level L or below, and when the detection time is continued for a prescribed time, a jet pump 5 is accelerated. When the liquid surface 4a ascends, on the contrary, the pump 5 is decelerated. According to this method, the liquid surface level 4a is always maintained in an optimum level, and an adjustment of the liquid surface level can be automated.
|
