JPS643402A - Full-automatic boiler for tea making - Google Patents

Abstract

PURPOSE: To all fully automatically conduct from a start to a steam constant value flow control by executing a temperature control until a temperature becomes substantially 100 deg.C at the time of starting a boiler and then conducting a constant value steam flow control. CONSTITUTION: Since a steam temperature is 95 deg.C or lower at the time of rising, a solenoid valve 24 of a larger nozzle 22 is opened, and the boiler 1 is fired with a large flame. Since there is no steam flow, a control motor 32 is forward rotated by a continuous control logic and an electric positioner, and a supplied oil pressure is regulated to a highest pressure. The boiler 1 is burned at the maximum, and heated in a shortest time. When the boiler 1 is boiled to generate steam, the steam temperature becomes 95 deg.C or higher, and hence it is transferred to a constant value flow rate control of the steam amount. That is, if a set steam amount SP is small, a solenoid valve 23 of a smaller nozzle 21 is opened, and the previous valve 24 is closed. After the generated steam amount PV arrives at a set value SP, it becomes much larger than the value SP as it is and hence the supply oil pressure is gradually reduced. The oil pressure is controlled to a position in which the generated steam amount PV coincides with the set value SP.