| 摘要 |
PROBLEM TO BE SOLVED: To provide a gas alarm in which only necessary components can be replaced when a pump device is replaced to save resources and a maintenance operation including the replacement of the pump device is facilitated to increase maintenance performance. SOLUTION: The gas alarm is provided with the pump device configured of: a pump unit formed by fixing a movable object with a magnet to a diaphragm made of rubber in which a pump chamber is formed; and an electromagnet which is separated from the pump unit and moves the diaphragm back and force by oscillating the movable object using a magnetic action. The pump unit is detachably mounted on the pump unit mounting part in the gas alarm body, and the electromagnet is fixed to the gas alarm body. COPYRIGHT: (C)2010,JPO&INPIT
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