High speed solenoid valve actuator
First Claim
1. An electromagnetic actuator comprisingA. armature means comprising a first rod shaped section and a second section of increased radius,B. stator means comprising a generally cylindrical housing having a first pole piece and a second pole piece, the stator means defining a flow path axially extending through the stator means, andC. coil means contained within the stator means, wherein the stator means and the armature means defined a closed electromagnetic circuit upon excitation of the coil means, the circuit comprising a first air gap between the rod section of the armature and the first pole piece and a second air gap between the increased radius armature section and the second pole piece, the plane of both air gaps being normal to the axis of the armature.
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Accused Products
Abstract
An actuator for an axial flow control valve for operation at high speeds comprises an axially symmetrical plunger armature prebiased against a valve seat in a normally closed position, the plunger having a head portion of increased diameter and a rod portion, the rod portion being slidably received within a central passage of a bobbin, and axially spaced from a pole piece. The valve actuator further comprises a cylindrical housing encasing in coil wound around the bobbin with a central passage configured to allow the flow of fluid around the armature and pole piece when the valve is open, the pole piece, armature housing and end piece being magnetically permeable and the magnetic circuit being completed by a similarly magnetically permeable washer fitted into the housing having an internal opening diameter greater than the diameter of the plunger rod section and less than the diameter of the plunger head section positioned on the bobbin side of the plunger head. Upon excitation of the coil a magnetic circuit is completed, comprising two air gaps, the first being the conventional air gap between the pole piece face and the opposing face of the plunger rod section end, and the second air gap being between the axially opposing surfaces of the washer and the plunger head whereby both air gaps act in an axial direction to produce a high ratio of axial force to mass of the plunger armature creating high speed operation.
76 Citations
20 Claims
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1. An electromagnetic actuator comprising
A. armature means comprising a first rod shaped section and a second section of increased radius, B. stator means comprising a generally cylindrical housing having a first pole piece and a second pole piece, the stator means defining a flow path axially extending through the stator means, and C. coil means contained within the stator means, wherein the stator means and the armature means defined a closed electromagnetic circuit upon excitation of the coil means, the circuit comprising a first air gap between the rod section of the armature and the first pole piece and a second air gap between the increased radius armature section and the second pole piece, the plane of both air gaps being normal to the axis of the armature.
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11. A valve device comprising
A. valve seat means, B. valve head means for engaging the valve seat means and thereby preventing flow through the valve, the valve head means being actuated by electromagnetic actuator means for causing the valve head means to releasably engage the valve seat, comprising an armature comprising a first rod shaped section and a second valve head section of increased radius, and a stator comprising a generally cylindrical housing having a first pole piece and a second pole piece and a wire coil contained within the housing, wherein an axially extending flow path is defined through the stator means wherein the stator and the armature define a closed electromagnetic circuit upon sufficient electrical current passing through the wire coil, the circuit comprising a first air gap between the rod section of the armature and the first pole piece and a second air gap between the valve head section and the second pole piece, the plane of both air gaps being normal to the axis of the armature.
Specification