Vortex shedding flowmeter
US4694702A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 11, 1985 |
| Grant date | Sep 22, 1987 |
| Priority date | — |
| Expiry date | Sep 11, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F1/3259
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A vortex shedding flowmeter comprises a flow passage through which a fluid flows, a bluff body arranged in the flow passage for generating Karman vortex of the fluid and provided with a pair of holes which open to respective side surfaces of the bluff body and extend toward and penetrate through one end of the bluff body for introducing a pressure change caused by the Karman vortex, a body which is an independent member from the bluff body, a pair of detecting parts provided in the body and comprising a pair of recesses provided on the body, a pair of fixed electrodes and a pair of movable electrodes provided in the recesses with a predetermined distance therebetween, a communicating hole provided in the body for communicating a pair of spaces formed between the fixed and movable electrodes, and a sealed fluid sealed in the spaces and the communicating hole, where the movable electrodes are displaced responsive to the pressure change in the fluid introduced from the bluff body and received by surfaces of the variable electrodes opposite to surfaces in contact with the sealed fluid and the fixed and movable electrodes constitute a pair of variable capacitors, and a detecting circuit…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.