| 摘要 |
PURPOSE: A wind pressure switch for a boiler is provided to improve the measurement accuracy of pressure variation by using a differential transformer that changes the displacement of a diaphragm due to an air pressure flowed in an air blower into a corresponding voltage. CONSTITUTION: A protruding unit(32) is adhered to a center of a diaphragm(30). A core(34) is geared with the protruding unit(32) to move to a predetermined direction according to the displacement of the protruding unit(32). A differential transformer(36) outputs the displacement according to the movement of the core(34) as a corresponding voltage value. A spring(38) returns the core(34) to its original position. A control screw(40) controls an elastic pressure of the spring(38).
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