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US 6,684,709 B2Granted
Pressure transducer with captured non compressible liquid volume defining neutral condition
OwnerDwight N. Johnsoninventor
Life of this patent
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Abstract
A pressure transducer which has a closed chamber which is full of oil or other non-compressible liquid. Pressure communicates with a diaphragm which defines one side of the closed chamber and the pressure communicates via the oil with a pressure sensor which is mounted within the oil spaced from the diaphragm. The liquid entered the closed chamber through a inlet hole with a selected volume driven into the closed chamber by a ball which is forcefully driven a selected distance into the inlet hole before stopping at the end of the inlet hole against a physical stop.
Claims3
A pressure transducer comprising
- a closed chamber having a diaphragm defining one side,
- a pressure sensor mounted within said closed chamber with a space separating the pressure sensor and said diaphragm,
- an inlet bore communicating with said closed chamber including
- an outer enlarged diameter portion,
- a first reduced diameter portion extending a selected distance inwardly from said enlarged diameter portion towards said closed chamber terminating at a second further reduced diameter portion,
- a ball wedged into said first reduced diameter portion against said second further reduced diameter portion, and
- a non-compressible liquid filling said closed chamber,
- said diaphragm being in the relaxed state.
5 more elements
Dependencies are inferred from the claim text.