Flow velocity measuring device
US3948097A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 26, 1974 |
| Grant date | Apr 6, 1976 |
| Priority date | — |
| Expiry date | Aug 26, 1994 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F1/3218
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A flow metering apparatus of the type having a vortex generating element with a generally elongate cylindrical shape placed in a stream of flowing fluid so as to produce Karman's vortices at a rate proportional to the velocity of the flowing fluid, with means for detecting the rate of production of vortices to give a linearly related measure of fluid velocity. To improve the correspondence of vortex production rate with flow velocity over wide conditions of flow, the element is formed with a rectangular cross-section in which the depth d along the direction of flow and the height h across the direction of flow are arranged in a ratio d/h of between about 0.5 and 0.9 and preferably in a ratio of 2/3. In the vortex generating element, passageway means extend between openings in the two opposed rectangle sides which are aligned with the direction of flow. The passageway means communicate fluid fluctuations past a flow detector to measure the frequency of vortex production and thereby determine the velocity of the fluid stream. Further improvement of the correspondence of vortex production rate with flow velocity is attained by dimensioning the area A of the passageway opening in relat…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.