Valve with temperature compensation
AssigneeEagle Actuator Components GmbH & Co. KG
InventorsRalf Heinrich, Daniel Koch, Diether Hoppner, Siegfried Driemer
Life of this patent
Estimating the term…
Abstract
A valve is provided having a circuit that includes an electrical conductor with a temperature-dependent electrical resistance. The electrical conductor is connected in series to an electrical series resistor, which includes a parallel circuit of a non-reactive wire and an NTC resistor. The electrical conductor includes a coil wire wound into a magnetic coil that is operable to move an armature to open or close the valve. The effect of the operation of the valve itself on the magnetic force of the coil is minimized by arranging the NTC resistor to be thermally coupled with the coil wire.
Claims8
A valve, comprising:
- a conduit through which fluid may flow;
- a sealing seat;
- a coil that includes an electric conductor wound over a coil support;
- an armature at least partially disposed within the coil and movable to open and close the sealing seat to control the flow of fluid through the conduit, the armature being movable in response to a magnetic field generated by the coil;
- and
- an electric series resistor that compensates for temperature-related resistance changes of the coil, the electric series resistor being connected in series with the coil and comprising a non-reactive wire connected in parallel with a negative temperature coefficient resistor, the non-reactive wire being wound around the coil support so as to be coaxial with the coil, and wherein the resistance of the non-reactive wire at 600° C. is less than 20% higher than the resistance of the non-reactive wire at 20° C.;
- and
- wherein the non-reactive wire is made of an alloy comprising copper, nickel and manganese, wherein the electric conductor of the coil comprises a copper wire and wherein the non-reactive wire is wound over the copper wire and is electrically insulated from the copper wire.
Dependencies are inferred from the claim text.