Vibration type measuring transducer and measuring system formed therewith

Patent metadata

Field	Value
Publication number	US-8931346-B2
Application number	US-201113976138-A
Country	US
Kind code	B2
Filing date	Nov 24, 2011
Priority date	Dec 30, 2010
Publication date	Jan 13, 2015
Grant date	Jan 13, 2015

Abstract

A measuring transducer having exactly four flow openings, and an outlet-side housing end formed by means of an outlet-side flow divider having exactly four flow openings. A tube arrangement has exactly four curved or bent measuring tubes connected to the flow dividers for guiding flowing medium along flow paths connected in parallel. Each of the four measuring tubes opens with an inlet-side measuring tube end into one of the flow openings of the inlet-side flow divider, and with an outlet-side measuring tube end into one of the flow openings of the outlet-side flow divider. A first coupling element for adjusting eigenfrequencies of natural oscillation modes of the tube arrangement. An electro-mechanical exciter mechanism of the measuring transducer serves for producing and/or maintaining mechanical oscillations of the four measuring tubes. The first coupling element of first type includes, furthermore, a deformation body as well as four connecting struts, of which each is connected both with the deformation body as well as also with exactly one of the measuring tubes; conversely, also each of the measuring tubes is connected with exactly one of the four connecting struts.

First claim

The invention claimed is:

1. A measuring transducer of the vibration type for registering at least one physical, measured variable of a flowable medium conveyed in a pipeline and/or for producing Coriolis forces serving for registering a mass flow rate of a flowable medium conveyed in a pipeline, said measuring transducer comprising:
a transducer housing, an inlet-side, first housing end of said transducer housing is formed by means of an inlet-side, first flow divider including four, mutually spaced flow openings, and an outlet-side, second housing end of said transducer housing is formed by means of an outlet-side, second flow divider including four, mutually spaced flow openings;
a tube arrangement including four curved or bent measuring tubes, which are connected to said flow dividers for guiding flowing medium along flow paths connected in parallel, of which measuring tubes:
a first measuring tube opens with an inlet-side, first measuring tube end into a first flow opening of the first flow divider, and with an outlet-side, second measuring tube end into a first flow opening of the second flow divider,
a second measuring tube, opens with an inlet-side, first measuring tube end into a second flow opening of said first flow divider and with an outlet-side, second measuring tube end into a second flow opening of said second flow divider,
a third measuring tube opens with an inlet-side, first measuring tube end into a third flow opening of said first flow divider and with an outlet-side, second measuring tube end into a third flow opening of said second flow divider,
and a fourth measuring tube, opens with an inlet-side, first measuring tube end into a fourth flow opening of said first flow divider and with an outlet-side, second measuring tube end into a fourth flow opening of said second flow divider;
a first coupling element of the first type, which is spaced both from said first flow divider as well as also from said second flow divider, and affixed, to each of the four measuring tubes and which serves for setting eigenfrequencies of natural oscillation modes of said tube arrangement, in which each of the four measuring tubes simultaneously executes or can execute bending oscillations about a respective static resting position; and
an electro-mechanical exciter mechanism for producing and/or maintaining bending oscillations of each of said four measuring tubes, wherein:
said two flow dividers are embodied and arranged in the measuring transducer in such a manner, that an imaginary first connecting axis of the measuring transducer imaginarily connecting said first flow opening of said first flow divider with the first flow opening of said second flow divider extends parallel to an imaginary second connecting axis of the measuring transducer imaginarily connecting the second flow opening of said first flow divider with the second flow opening of said second flow divider,
and that an imaginary third connecting axis of the measuring transducer imaginarily connecting the third flow opening of said first flow divider with the third flow opening of said second flow divider extends parallel to an imaginary fourth connecting axis of the measuring transducer imaginarily connecting the fourth flow opening of said first flow divider with the fourth flow opening of said second flow divider;
the measuring tubes are embodied and arranged in such a manner,
that said tube arrangement exhibits a first imaginary longitudinal section plane extending both between the first measuring tube and the third measuring tube, as well as also between the second measuring tube and the fourth measuring tube,
and that said tube arrangement exhibits a second imaginary longitudinal section plane perpendicular to its imaginary first longitudinal section plane and extending both between the first measuring tube and the second measuring tube as well as also between the third measuring tube and the fourth measuring tube;
and said first coupling element of the first type includes a deformation body and four connecting struts, of which connecting struts: a first connecting strut is connected with said deformation body and with the first measuring tube, a second connecting strut is connected with said deformation body and with the second measuring tube, a third connecting strut is connected with said deformation body and with the first measuring tube, and a fourth connecting strut is connected with said deformation body and with the fourth measuring tube.

2. The measuring transducer as claimed in claim 1 , wherein: each of said four measuring tubes is, at least sectionally, V-shaped or, at least sectionally, circular arc shaped.

3. The measuring transducer as claimed in claim 1 , wherein:
said four connecting struts, comprise, in each case, metal;

and/or said four connecting struts, comprise, in each case, at least partially, steel;
and/or each of said four connecting struts is, in each case, connected with the respective measuring tube by material bonding;
and/or each of said four connecting struts is, in each case, welded to the respective measuring tube;
and/or each of said four connecting struts is, in each case, affixed to said deformation body by material bonding;
and/or each of said four connecting struts in each case, is connected with said deformation body by means of a screwed connection.

4. The measuring transducer as claimed in claim 1 , wherein:
said exciter mechanism is embodied in such a manner that each of said four measuring tubes is excitable, and/or said exciter mechanism is embodied in such a manner that said first measuring tube and said second measuring tube are excitable to bending oscillations opposite-equal relative to the second imaginary longitudinal section plane, and said third measuring tube and said fourth measuring tube are excitable to bending oscillations opposite-equal relative to the second imaginary longitudinal section plane;
and/or said exciter mechanism is embodied in such a manner that said first measuring tube and said third measuring tube are excitable to bending oscillations opposite-equal relative to the second imaginary longitudinal section plane, and said second measuring tube and said fourth measuring tube are excitable to bending oscillations opposite-equal relative to the second imaginary longitudinal section plane;
and/or said tube arrangement is mirror symmetrical relative to the first imaginary longitudinal section plane;
and/or said tube arrangement is mirror symmetrical relative to the second imaginary longitudinal section plane; and/or said tube arrangement is mirror symmetrical both relative to the first imaginary longitudinal section plane as well as also relative to the second imaginary longitudinal section plane;
and/or said first coupling element of the first type is embodied and arranged in such a manner that it is mirror symmetrical both relative to the first imaginary longitudinal section plane as well as also relative to the second imaginary longitudinal section plane of said tube arrangement;
and/or each of said four measuring tubes has a bending stiffness determined by a modulus of elasticity dependent on a material of said measuring tube, as well as also by an areal moment of inertia dependent on a caliber and a wall thickness, and wherein both said second measuring tube as well as also said third measuring tube and said fourth measuring tube each have a bending stiffness, which in each case is equal to a bending stiffness, E 18 J 18 , of said first measuring tube;
and/or said deformation body is formed by means of a frame construction.

5. The measuring transducer as claimed in claim 1 , wherein:
said first connecting strut is connected with a first strut end with said deformation body and with a second strut end with said first measuring tube;
said second

Assignees

• Rieder Alfred
• Huber Christof
• Bitto Ennio
• Schutze Christian
• Braun Marcel
• Flowtec Ag

Inventors

• Rieder Alfred
• Huber Christof
• Bitto Ennio
• Schutze Christian
• Braun Marcel

Classifications

• G01F1/8477

  with multiple measuring conduits · CPC title

• G01F1/8413 Primary

  means for influencing the flowmeter's motional or vibrational behaviour, e.g., conduit support or fixing means, or conduit attachments · CPC title

• G01F15/02

  Compensating or correcting for variations in pressure, density or temperature · CPC title

• G01F1/8472 Primary

  having curved measuring conduits, i.e. whereby the measuring conduits' curved center line lies within a plane (G01F1/8481 takes precedence) · CPC title

• G01F25/10

  of flowmeters · CPC title