Multi-vortex flowmeter employing volume flow rate as switching point
US7895904B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 23, 2007 |
| Grant date | Mar 1, 2011 |
| Priority date | — |
| Expiry date | Jun 23, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F1/86
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A multi-vortex flowmeter includes a vortex flowmeter for measurement by volume flow rate and a thermal flowmeter for measurement by mass flow rate to selectively use the two flowmeters according to the flow rate of fluid to be measured flowing through a flow channel. The multi-vortex flowmeter has a switching point between two flowmeters based on the mass flow rate. A mass flow rate Qm at the switching point in a range larger than the minimum flow rate of a vortex flowmeter and smaller than the maximum flow rate of a thermal flowmeter is determined by: Qm=K3*√P. Alternatively, a volume flow rate Q at the switching point in a range larger than the minimum flow rate of a vortex flowmeter and smaller than the maximum flow rate of a thermal flowmeter is determined by: Q=K1/√P.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.