Coriolis mass flow meter
A Coriolis mass meter with two tube sections connected by a coupling extending between connection points of the tube sections wherein the coupling extends a distance between the connection points which exceeds the shortest perpendicular distance between the first and the second tube sections. The coupling facilitates less stiffness of the tubes against Coriolis oscillation and thus provides a mass meter with a stronger and potentially more reliable measuring signal.
1. A mass flow meter based on Coriolis principle, comprising:
a first section and a second section of a tube operable to have fluid flowing there through;
a first arm of a coupling extending between a connection point of the first tube section on a first side and a connection point of the first tube section on a second side;
a second arm of the coupling extending between a connection point of the second tube section on the first side and a connection point of the second tube section on the second side;
a third arm of the coupling connecting the first and second arms approximately halfway between the respective connection points; and
a driver operable to oscillate the tube in an oscillating direction.
2. A meter according to claim 1 , wherein at least one of the first and second tube sections forms a loop defining a plane.
3. A meter according to claim 1 , wherein one of said first arm and the second arm extends in a direction at an angle to the oscillating direction.
4. A meter according to claim 1 , wherein the third arm extends parallel to the oscillating direction.
5. A meter according to claim 1 , wherein the third arm is perpendicular to the first arm and the second arm.
6. A meter according to claim 1 , wherein the third arm is joined to the first and the second arms using joints at least one of said joints being operable to allow reorientation of the third arm in relation to a corresponding one of said first and second arms.
7. A meter according to claim 1 , wherein both the first and second tube sections form loops defining planes.
8. A meter according to claim 1 , wherein the planes are parallel.
9. A meter according to claim 1 , wherein the first and second tube sections are two separate tubes each forming intake and outlet openings for the fluid.
10. A meter according to claim 9 , wherein the coupling extends through a point with substantially equal distance to the intake and the outlet openings of at least one of the two tube sections.
11. A meter according to claims 9 , wherein the coupling extends through a point with substantially equal distance to the intake openings and to the outlet openings of both the first and second tube sections.
12. A meter according to claim 1 , further comprising a bracing for connecting the coupling to a chassis.
13. A meter according to claim 12 , wherein the bracing extends substantially parallel to the oscillating direction.
14. A meter according to claim 12 , wherein the bracing extends at an angle to the oscillating direction.
15. A meter according to claim 1 , wherein distance between the first side and the second side of the first tube exceeds a shortest perpendicular distance between the first and the second tube sections.