| 摘要 |
PURPOSE:To keep the flow rate of circulation constant against changes in source voltage and stabilize the control in a range down to a small flow rate in the use of a bath circulation device for circulating bathwater by the use of a pump. CONSTITUTION:A device comprises a circulating channel having a pump 3, a phase control circuit 11 for the pump, a voltage detective part 12, and a flow-rate control part 14. On the basis of voltage data detected by the voltage detective part 12 the flow-rate control part 14 adjusts the firing phase angle of the pump for each set value of the flow rate in such a manner as to keep the flow rate of circulation constant against changes in source voltage. The flow rate of circulation can be controlled in a stabilized manner in an extensive range. |
