Patent ID: 8096952
Filing Date: 2012-01-17
Classification: A61B,F16K,H01F

Abstract:
1. An electric-powered air release valve comprising: a nozzle provided as an air discharge vent to an end part of an air channel; a rod-shaped fixed iron core disposed so that an end part in a longitudinal direction is aligned with the nozzle on the same side as the nozzle; an excitation coil provided so as to surround the fixed iron core, for magnetizing the fixed iron core in a longitudinal direction when electrical power is applied; a movable iron plate that is disposed so as to face said nozzle and an end part of said fixed iron core and that moves toward said nozzle from an initial position according to a magnetic attraction force when said fixed iron core is magnetized a spring for urging the movable iron plate into said initial position; a valve body provided to said movable iron plate, for adjusting an opening amount of said nozzle in accordance with a movement position when the movable iron plate moves toward said nozzle in opposition to an urging force of said spring; and a yoke that is magnetically connected to another end part of said fixed iron core, and whose distal end part is disposed opposite a position separated from an end part of said fixed iron core above said movable iron plate, via a magnetic gap; wherein an opening is formed in said movable iron plate that is capable of accommodating an end part of said fixed iron core when the movable iron plate is moved toward said nozzle, and a magnetic gap is maintained between an internal periphery of the opening and an external periphery of an end part of said fixed iron core; said fixed iron core and said air channel are each provided to an internal side or interior of a bobbin onto which said excitation coil is wound; and said bobbin is composed of a resin molding having said air channel and a fitting hole for said fixed iron core; said fixed iron core is fitted into said fitting hole so that one end part of said fitted iron core protrudes from an end of said fitting hole, and a nozzle of one end part of said air channel is provided in a position adjacent to one end part of the fixed iron core so as to protrude from one end surface of said bobbin; and another end part of said air channel is provided as an inflow vent to another end surface of said bobbin.