Coriolis flowmeter

Details Coriolis flowmeter Coriolis flowmeter

2007-08-21

2007-08-21

Thompson, Jewel (Department: 2855)

Measuring and testing

Volume or rate of flow

Mass flow by imparting angular or transverse momentum to the...

Reexamination Certificate

active

10556678

ABSTRACT:
When outputs from two vibration detection sensors are measured by a Coriolis flowmeter in a form of phase difference time, a tube must be thinned to increase a sensitivity of the flowmeter to enable measurement and accordingly flow velocity and pressure loss increase, and a thickness of the flowmeter must be reduced and therefore a pressure resistance cannot be readily enhanced. In particular, the sensitivity of signals to flow rate is difficult to increase and, accordingly, a flow rate of a low-density gas cannot be accurately measured. In the present invention, a Coriolis vibration frame16carrying a U-shaped tube is swingably fixed to a forced vibration frame19fixed to a support base22to form a highly rigid frame structure limiting a vibrating direction to one degree of freedom in a Coriolis vibration direction. The forced vibration frame19is vibrated by a vibration exciter20so that a ratio of a forced vibration frequency to the Coriolis frequency of a pipeline is at least 1 to 10. The ratio of the amplitude of the forced vibration to the amplitude of the Coriolis vibration is calculated based on signals from two vibration sensors such as acceleration sensors17and18to measure the mass flow rate of a fluid flowing in the pipeline.

REFERENCES:
patent: 5323658 (1994-06-01), Yao et al.
patent: 6006609 (1999-12-01), Drahm et al.
patent: 6647807 (2003-11-01), Drahm et al.
patent: 7-72693 (1995-08-01), None
patent: 9-15015 (1997-01-01), None
patent: 2001-241987 (2001-09-01), None

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