| 摘要 |
<p>The electric-powered air release valve (10) comprises a nozzle (23) provided to an end part of an air channel in a bobbin (20); a fixed iron core (40) that is disposed in the bobbin (20) and aligned with the nozzle (23); an excitation coil (30) for magnetizing the fixed iron core (40) when electrical power is applied; a movable iron plate (60) that moves toward the nozzle (23) from an initial position according to a magnetic attraction force when the fixed iron core (40) is magnetized; a leaf spring (68) for urging the movable iron plate (60) into the initial position; a rubber valve (70) provided to the movable iron plate (60), for adjusting an opening amount of the nozzle (23); and a yoke (50), with distal end parts disposed on both sides of the movable iron plate (60) so as to face with each other through a magnetic gap; wherein a circular hole capable of accommodating a circular column part at one end of the fixed iron core (40) when the movable iron plate (60) is moved toward the nozzle (23) is formed in the movable iron plate (60): and a magnetic gap is maintained between an internal periphery of the circular hole and an external periphery of the circular column part at one end of the fixed iron core (40).
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