| 摘要 |
A moisture resistant electromagnetic door holder is sealed to avoid failures caused by exposure to moisture. The electromagnetic door holder comprises a wall box, a coil housing attached to the wall box, and a coil assembly attached to the coil housing. The coil assembly includes a bobbin containing a wire coil. A sealant, preferably epoxy, covers the face of the bobbin to prevent moisture from entering the coil assembly. A coil seal may be incorporated between a coil passage in the coil housing and the coil assembly. A gasket reside between the coil housing and the wall box. The resulting the electromagnetic door holder resists the entry of moisture into the electromagnetic door holder and thereby improves the reliability of the electromagnetic door holder.
|
