Solenoid pressure transducer
AssigneeFasco Controls Corporation
InventorWilliam R. Maxson
Life of this patent
Estimating the term…
Abstract
A solenoid pressure transducer for measuring and controlling pressure within a system includes pressure sensing technology incorporated into a solenoid valve such that a common pressure chamber is used to sense pressure of a fluid and to control the flow of the same fluid. A solenoid sleeve forms the pressure chamber and a sensing element attached to the sleeve is used to measure pressure within the sleeve. The pressure measurement is then used by the solenoid sleeve to control the position of the solenoid valve.
Claims12
A solenoid pressure transducer for measuring and controlling pressure within a system comprising:
- a solenoid sleeve of a nonmagnetic material enclosing a pressure chamber, the pressure chamber being in communication with a source of the system pressure;
- a sensing element comprising a silicon die attached to the sleeve for measuring strain in the sleeve caused by the system pressure;
- a vitreous glass bond attaching the silicon die to the sleeve;
- and
- an actuator with in the solenoid sleeve for controlling the system pressure in response to a pressure measured by the sensing element.
A pressure controller for controlling pressure of a fluid, comprising:
- a deep-drawn solenoid sleeve of a nonmagnetic material having an opening in fluid communication with a source of the fluid and forming a pressure chamber, the sleeve having a flexible closed end which acts as a diaphragm in which strain is induced by the pressure of the fluid in the pressure chamber;
- a sensing element comprising a silicon die attached to the closed end of the sleeve for measuring the strain in the closed end;
- a vitreous glass bond attaching the silicon die to the closed end of the sleeve;
- a valve, positioned between the source of the fluid and the pressure chamber, movable between an open position in which the pressure chamber is in fluid communication with the source of the fluid and a closed position in which the pressure chamber is isolated from the source of the fluid;
- and
- an actuator responsive to an output of the sensing element for controlling movement of the valve between the open and closed positions.
Dependencies are inferred from the claim text.