24/06/2005 - Controller General of Patents, Designs, and Trade Marks

(12) PATENT APPLICATION PUBLICATION
(19) INDIA (21) Application No: 1027/MUMNP/2003 A
(22) Date of filing of Application : 07/11/2003 (43) Publication Date: 24/06/2005
(54) Title of the invention: TRANSDUCER OF THE VIBRATION TYPE.
(51) International Classification: G 01 F 1/84 (71)
(31) Priority Document No. : 01112546.5
(32) Priority Date : 23/05/2001
(33) Name of priority country : E.P.O.
(86) International Application : PCT/EP02/05276
No. and Filing Date : 14/05/2002
(87) International :
Publication No. WO02/099363 A1
(61)
(62)
Patent of addition to
Application No. : NIL
Filed on N.A.
Divisional to
Application No. : NIL
Filed on : N.A.
(72)
Name of the Applicant:
ENDRESS+HAUSER FLOWTEC AG
Address of the Applicant:
KAGENSTRASSE 7,
CH-4153 REINACH,
SWITZERLAND.
Name of the Inventors:
1. DRAHM WOLFGANG
2. RIEDER ALFRED
3. BITTO ENNIO
4. LORENZ RAINER
5. SCHUTZE CHRISTIAN
6. WENGER ALFRED
7. FUCHS MICHAEL
Filed U/S 5(2) before the
Patents (Amendment)
Ordinance,2004 : NO
(57) Abstract : The transducer comprises a curved measuring
tube (10), which vibrates in operation, for guiding the fluid and a
counter-vibrator (20), which oscillates in counter-phase during
operation and is essentially parallel to the measuring tube (10).
The measuring tube (10) and the counter-vibrator (20) are
mechanically coupled to each other by means of a coupling (31)
on the inlet side and a coupler (32) on the outlet side. The
measuring tube (10) communicates with the fluid-guiding
pipeline by means of a inlet tube piece (12) opening out on the
inlet side and an outlet tube piece (12) opening out on the outlet
side. An exciter arrangement (40) for the transducer induces
( Figure : 1a & 1b )
the
measuring tube (10) and the counter-vibrator (20) to vibrate at an excitation frequency (fexc), whilst a sensor arrangement
(50) records vibrations of the measuring tube (10) at the inlet and outlet ends. An inner piece, formed from at least the
measuring tube (10), the counter-vibrator (20), the exciter arrangement (40) and the sensor arrangement (50) oscillates in
operation about a longitudinal axis (A1) of the transducer, running essentially with the inlet and outlet tube pieces (11,
12) and thus also causes a rotation of the coupler (31, 32) about the longitudinal axis (A1) and at least partly an
essentially torsional, elastic deformation of the inlet and outlet tube pieces (11, 12). In order to allow an oscillation of the
inner piece with a weak rotation, at least the coupler (31) is tuned to a torsional stiffness for the inlet tube piece (11) and
at least the coupler (32) is tuned to a torsional stiffness for the outlet tube piece (12) in such a way that an inlet-side
inherent characteristic torsional mode for the coupler (31) and inlet tube piece (11) has a characteristic frequency (f1)
almost the same as the exciter frequency (fexc) and an outlet side inherent characteristic torsional mode for the coupler
(32) and outlet piece (12) as a characteristic frequency (f2) essentially the same as the characteristic frequency (f1). The
transducer is thus dynamically well balanced in operation over a wide fluid density range, despite the use of only one
curved measuring tube.
Total Pages : 26.
The Patent Office Journal 24.06.2005 17861