| 摘要 |
PURPOSE:To rapidly evacuate a flow passage by a method wherein, during trial operation of a device which pressurizes and feeds fuel oil to a return type pressure spray nozzle with the aid of a pump and regulates an oil amount of a part thereof by means of a flow rate regulating valve to return the oil amount, the oil fed through the flow rate regulating valve alternately and repeatedly with high and low flow rate. CONSTITUTION:Kerosene flows in an outbound oil pipe from an oil storage tank and is pressurized and fed to a return type pressure spray nozzle with the aid of a pump. A part thereof is atomized, the rest enters a return oil pipe, and a return oil amount is regulated by a flow rate regulating valve to return the rest to the upper stream side of the pump. During trial operation, an operation switch is turned ON, and a faucet is opened after a lapse of a specified time t1 to effect slow ignition of a burner. A kerosene feed amount is maximized after a lapse of a specified time t2, and thereafter, it is minimized within a specified time t3, and it is maximized within a specified time t4. Drive of the flow rate regulating valve is controlled so that repetition of above operation is effected a few times. When an oil amount is a maximum, air flowing to the return oil pipe side is caused to flow to the outbound oil pipe side, and when a return oil amount is a minimum, a spray amount is maximized. Air on the outbound oil pipe side is bled through a nozzle, and accurate regulation of flow amount can be carried out through following continuous operation. |
