Double-loop Coriolis type mass flowmeter
First Claim
1. A mass flow flowmeter of the Coriolis type comprising:
- A a pipe having an inlet and an outlet end coiled to form a double loop having identical circular loops;
B a stationary frame for supporting the double loop to anchor said pipe at the inlet end and at the outlet end and at its center which is the junction of the two loops to define a tuning fork in which the identical loops on either side of the center function as tines that are free to vibrate back and forth with respect to the center as well as to twist;
C an electromagnetic driver mounted at the vertex of the double loop, the driver when electrically energized causing the loops to vibrate in phase opposition at the natural frequency of the tuning fork;
D means to conduct the fluid through the pipe from the inlet to the outlet end thereof, thereby subjecting the double sionally oscillate in accordance with the mass flow of the fluid;
E a pair of capacitance sensors symmetrically mounted the respective loops in either side of the center whereby insignals of different magnitude as a function of mass flow; and
F means to supply the signals from the sensors to a differential amplifier whose output is substantially proportional to the mass flow rate.
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Accused Products
Abstract
A mass flowmeter of the Coriolis type in which the fluid to be metered is conducted through a pipe which is coiled to form a double loop. The pipe is anchored at its inlet and outlet ends and also at its center which is the junction of the two loops to define a tuning fork in which the identical loops on either side of the anchored center function as tines that are free to vibrate as well as to twist. An electromagnetic driver mounted at the vertex of the double loop is electrically energized to cause the loops to vibrate in phase opposition at the natural frequency of the tuning fork. The fluid passing through the double loop is subjected to Coriolis forces, thereby causing the vibrating loops to torsionally oscillate in accordance with the mass flow of the fluid. Capacitance sensors are symmetrically mounted on the respective loops to yield signals having a difference in magnitude and phase that depends on the amplitude of the torsional oscillations, these signals being applied to a differential amplifier whose output is proportional to the mass flow of the fluid.
50 Citations
12 Claims
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1. A mass flow flowmeter of the Coriolis type comprising:
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A a pipe having an inlet and an outlet end coiled to form a double loop having identical circular loops; B a stationary frame for supporting the double loop to anchor said pipe at the inlet end and at the outlet end and at its center which is the junction of the two loops to define a tuning fork in which the identical loops on either side of the center function as tines that are free to vibrate back and forth with respect to the center as well as to twist; C an electromagnetic driver mounted at the vertex of the double loop, the driver when electrically energized causing the loops to vibrate in phase opposition at the natural frequency of the tuning fork; D means to conduct the fluid through the pipe from the inlet to the outlet end thereof, thereby subjecting the double sionally oscillate in accordance with the mass flow of the fluid; E a pair of capacitance sensors symmetrically mounted the respective loops in either side of the center whereby in signals of different magnitude as a function of mass flow; and F means to supply the signals from the sensors to a differential amplifier whose output is substantially proportional to the mass flow rate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification