초록 ▼

A modulating valve is described for controlling the flow of a working fluid through a flow orifice. The valve includes a encapsulated armature having a permanent magnet and a pair of soft iron pole pieces within its interior. The armature is axially movable by the passage of current through one or a

A modulating valve is described for controlling the flow of a working fluid through a flow orifice. The valve includes a encapsulated armature having a permanent magnet and a pair of soft iron pole pieces within its interior. The armature is axially movable by the passage of current through one or a dual pair of solenoid coils surrounding the armature. A thin webbed sealing disk is stretched over the end of an armature housing extension and acts to close or modulate flow of working fluid by varying the axial clearance between the disk and a stationary annular seat of the flow orifice. The armature is supported on flexure guide springs that allow armature axial motion when axial magnetic forces are applied to the armature. These axial forces are provided by the interaction of the solenoid coil(s) and the field of the permanent magnet. A magnetic field gradient produced by the permanent magnet allows the coil to apply a force to the armature in either the valve opening or valve closing direction, depending on the coil current polarity. An armature velocity signal is used in a closed loop servo control of valve position to suppress valve oscillation and over shoot when a change in valve position is commanded.

대표청구항 ▼

A modulating valve comprising: a flow orifice having an orifice seat; an armature assembly including a valve seal on an axial end of said armature assembly, said valve seal being axially oriented with respect to said orifice seat; at least one annular solenoid coil; said armature assembly including

A modulating valve comprising: a flow orifice having an orifice seat; an armature assembly including a valve seal on an axial end of said armature assembly, said valve seal being axially oriented with respect to said orifice seat; at least one annular solenoid coil; said armature assembly including a cylindrical armature housing confined within an annulus formed by said at least one annular solenoid coil and moveable axially with respect to said at least one annular solenoid coil to any displaced selected position between a full open and close position of said valve seal and said orifice seat; a permanent magnet fixedly mounted in said cylindrical armature housing axially within said annulus of said at least one annular solenoid coil; further including a first magnetically inert cylindrical housing extending interiorly of said at least one annular solenoid coil; a second magnetically inert cylindrical housing annularly spaced interiorly of said first magnetically inert cylindrical housing forming a first flow passage therebetween; said cylindrical armature housing having an outer peripheral surface annularly spaced from said second magneticcally inert cylindrical housing forming a second flow passage therebetween; and wherein said permanent magnet and said at least one annular solenoid coil are remote from said first and second flow passages.