| 摘要 |
PURPOSE:To stabilize the accuracy of a pressure controller and to ensure the constant control of flow rate by using a semiconductor sensor as a pressure sensor. CONSTITUTION:For a pressure controller, a semiconductor sensor 1 consisting of a silicon pressure sensor is used to detect the pressure of an air path for combustion and convert the measured pressure into air pressure signals. Then the pressure controllers detects and measures the pressure produced a control valve 9 which is opened and closed by a control motor 8 by the sensor 1. This pressure is converted into electric signals with amplification 2 and supplied to a comparator 3. At the same time, the set voltage signal sent from a setting part 5 is also supplied to the comparator 3. These two signals are compared with each other to drive a relay 6 or 7. Thus the motor 8 is revolved forward and reversely and therefore the opening amount of the valve 9 is changed to obtain the coincidence between the set pressure value and the measured pressure value. |
