Mass flowmeter working on the coriolis principle
US5218873A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 30, 1991 |
| Grant date | Jun 15, 1993 |
| Priority date | — |
| Expiry date | Jan 30, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F1/8495
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
This mass flowmeter is designed to be installed in pipelines having nominal diameters greater than about 150 mm. It has a support tube (11), a vibrating system (12) disposed axially in the support tube and consisting of two straight measuring tubes (21, 22) mounted in a holder (23, 15) at each of their ends, and a vibration exciter (50) which sets each measuring tube into natural-resonance flexural vibration at the center. The soft-magnetic armature (51) of the vibration exciter (50) is secured to one of the measuring tubes, and its electromagnet (52) is mounted in the wall of the support tube (11) opposite the armature (51) via the metallic, nonferromagnetic coil can (53) and contains a soft-magnetic core (54). The central portion (55) of the latter, which is disposed in an energizing coil (57), carries a permanentmagnet inset (58) at the end opposite the armature, and the edge portions (56) of the core (54) extend along the outside of the energizing coil. Vibration sensors ( 30, 31) for sensing the mechanical vibrations are mounted on both sides of and at preferably equal distances from the vibration exciter (50), and an evaluation circuit (60) is provided for determining the mas…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.