Dynamic dampening in a frictionless solenoid valve

摘要

A rectilinear motion solenoid having a housing, an annular coil of electrical wire mounted in the housing and having a central hole therethrough. A first magnetic pole piece is oriented adjacent a first axial end face of the annular coil and a second magnetic pole piece oriented adjacent a second end face of said annular coil. An armature is movably mounted in the central hole. Two substantially linear springs are provided for securing the armature to the housing to effect a frictionless resilient suspension of the armature in the central hole. A closed chamber is filled with a liquid so that a disk movable with the armature is also movable in the chamber. A perimeter of the disk is oriented in close relation to an interior wall surface of the chamber to define a liquid flow restricting gap therebetween and effecting during operation a dynamic dampening of armature movement.