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US 5,407,174 AGranted
Proportional electropneumatic solenoid-controlled valve
AssigneePuritan-Bennett Corporation
InventorViraraghavan S. Kumar
Life of this patent
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AssigneePuritan-Bennett Corporation
InventorViraraghavan S. Kumar
Estimating the term…
A rectilinear motion proportional solenoid assembly includes a cylindrical housing containing an electromagnetic coil having a longitudinal coaxial bore. The housing contains magnetic material for providing a flux path for the magnetic field produced by the coil. A generally cylindrical magnetic pole piece element is inserted into the bore and a movable armature assembly of magnetic material is supported within the bore for movement along the longitudinal axis of the coil by a pair of thin, flexible suspension springs. One of the springs is located within the bore adjacent to one end of the magnetic pole piece whereat an axial gap between the pole piece and the armature is formed. A second spring is located within the housing within the vicinity of a radial air gap between the armature and the housing. The pole piece contains an auxiliary region adjacent to the axial air gap for shunting a portion of the axially directed magnetic flux, for effectively causing the force imparted to the movable armature by the application of a current to the electromagnetic coil to be substantially constant irrespective of the magnitude of the axial gap for a variation in the axial gap over a prescribed range.
A rectilinear motion proportional solenoid device comprising:
A rectilinear motion proportional solenoid assembly comprising a cylindrical housing accommodating an electromagnetic coil having a longitudinal bore, said housing containing magnetic material for providing a flux path for a magnetic field produced by said coil, a generally cylindrical magnetic pole piece disposed within said bore, a movable armature assembly of magnetic material supported for movement along a longitudinal axis within the bore of said coil by a pair of suspension springs, an axial gap formed between one end of said pole piece and said armature, a magnetic sleeve of magnetic material disposed adjacent to said magnetic pole piece, said magnetic sleeve having a tapered portion adjacent to said axial gap for diverting therefrom a portion of magnetic flux passing along said bore and thereby effectively causing the force imparted to the movable armature by the application of a current to the electromagnetic coil to be substantially constant irrespective of the magnitude of said axial gap for variation in said axial gap over a prescribed range.
Dependencies are inferred from the claim text.