WO2008071563A2 - Dispositif de détermination et/ou de surveillance d'une grandeur de processus - Google Patents

Dispositif de détermination et/ou de surveillance d'une grandeur de processus Download PDF

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Publication number
WO2008071563A2
WO2008071563A2 PCT/EP2007/063065 EP2007063065W WO2008071563A2 WO 2008071563 A2 WO2008071563 A2 WO 2008071563A2 EP 2007063065 W EP2007063065 W EP 2007063065W WO 2008071563 A2 WO2008071563 A2 WO 2008071563A2
Authority
WO
WIPO (PCT)
Prior art keywords
membrane
additional mass
mechanically
diaphragm
web
Prior art date
Application number
PCT/EP2007/063065
Other languages
German (de)
English (en)
Other versions
WO2008071563A3 (fr
Inventor
Sergej Lopatin
Helmut Pfeiffer
Original Assignee
Endress+Hauser Gmbh+Co.Kg
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Endress+Hauser Gmbh+Co.Kg filed Critical Endress+Hauser Gmbh+Co.Kg
Publication of WO2008071563A2 publication Critical patent/WO2008071563A2/fr
Publication of WO2008071563A3 publication Critical patent/WO2008071563A3/fr

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
    • G01F23/296—Acoustic waves
    • G01F23/2961—Acoustic waves for discrete levels
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
    • G01F23/296—Acoustic waves
    • G01F23/2965—Measuring attenuation of transmitted waves
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
    • G01F23/296—Acoustic waves
    • G01F23/2968—Transducers specially adapted for acoustic level indicators
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
    • G01N11/10—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by moving a body within the material
    • G01N11/16—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by moving a body within the material by measuring damping effect upon oscillatory body
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
    • G01N9/002—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity using variation of the resonant frequency of an element vibrating in contact with the material submitted to analysis

Definitions

  • the invention relates to a device for determining and / or monitoring at least one process variable of a medium, with at least one mechanically oscillatable unit, and with at least one drive / receiving unit, which excites the mechanically oscillatable unit to mechanical vibrations and which of the mechanically oscillatable unit receives mechanical vibrations.
  • the process variable is, for example, the level, the density or the viscosity.
  • the medium is, for example, a liquid, a bulk material or a gas.
  • the object of the invention is to provide an alternative embodiment to the existing in the prior art variants of a vibronic-based measuring device.
  • the mechanically oscillatable unit comprises at least a first membrane and a second membrane, and that the first membrane and the second membrane are mechanically coupled together.
  • the two membranes are elastically coupled together.
  • an embodiment of the invention provides that the mechanically oscillatable unit comprises exactly a first membrane and a second membrane. PatXML 2/10
  • An embodiment of the invention includes that the plane of the first membrane and the plane of the second membrane are at least in a state of rest substantially in the same plane.
  • the two membranes are thus at the same height, for example, with respect to the medium.
  • one membrane comprises the other membrane coaxially, wherein in particular the inner membrane is circular and the outer comprehensive membrane is annular.
  • An embodiment of the invention provides that the first membrane and the second membrane are designed and matched to one another such that the first membrane and the second membrane perform antiphase oscillations.
  • the two membranes thus oscillate in opposite directions. This causes, for example, no energy or moments to be transferred to the clamping of the membranes and thus to a container to which the membranes are attached.
  • An embodiment of the invention includes that the first membrane and the second membrane are designed and matched to one another such that the first membrane lies in the plane of the second membrane.
  • the first membrane is thus virtually in the membrane plane, which is spanned by the second membrane.
  • Basic membrane is provided, and that the first membrane and the second membrane are parts of the base membrane.
  • An embodiment of the invention includes that at least one web is provided, which divides the base membrane into the first membrane and the second membrane.
  • the measuring device according to the invention is virtually a membrane oscillator with a support ring, which divides the base membrane into, for example, an outer and an inner membrane.
  • the two membranes are thus structurally similar to a section through a coaxial cable with shielding as the outer second membrane and soul as the inner first membrane.
  • An embodiment of the invention provides that the base membrane and / or the first membrane and / or the second membrane at least PatXML 3 / -I0
  • the inner first diaphragm is circular and the outer second diaphragm extends annularly around the first diaphragm.
  • Drive / receiving unit is designed such that it excites the first membrane and / or the second membrane to vibrations of the first natural resonance. It is a fundamental wave excitation preferred so that the lowest possible frequency can be used. The frequency depends u.a. from the mass of the vibrator and its bending stiffness.
  • An embodiment of the invention provides that at least one first additional mass is provided, and that the first diaphragm and the first additional mass are mechanically coupled together. By the first additional mass, the resonance frequency of the first membrane can be adjusted.
  • An embodiment of the invention includes that at least one second additional mass is provided, and that the second diaphragm and the second additional mass are mechanically coupled together.
  • a second additional mass for the second membrane allows the adjustment of the oscillation frequency.
  • An embodiment of the invention provides that the first membrane and / or the first additional mass and / or the second membrane and / or the second additional mass are designed and matched to one another such that the first membrane and the first additional mass and the second Membrane and the second additional mass have substantially the same resonant frequency.
  • both membrane segments or membranes have the same flexural stiffness and the same additional masses, with a practice-oriented tuning is also possible with different stiffnesses and different additional masses at the same resonant frequency.
  • the first diaphragm and the first additional mass as the first vibration system and the second diaphragm and the second additional mass as PatXML 4/10
  • the second oscillating system have the same resonant frequency.
  • the sensor is independent of the clamping on the vessel wall. This requirement is necessary because the functionality must always be given after the installation of a sensor.
  • Clamping is provided that the base membrane and / or the first membrane and / or the second membrane is connected to the clamping / is, and that the web is connected to the clamping.
  • the membranes are connected to a chuck as part of a housing. The web, which separates the two membranes, is firmly connected to this clamping.
  • An embodiment of the invention provides that the clamping is connected to a container in which the medium is located.
  • An embodiment of the invention includes that the web is designed such that the web has a reduced bending stiffness in the vicinity of the base membrane.
  • the bridge therefore has a lower bending stiffness where the bridge and the membrane meet.
  • An embodiment of the invention provides that the web is tapered in the vicinity of the base membrane.
  • the fact that the web is tapered in the contact region or transition region between web and membrane.
  • Fig. 1 a schematic representation of an inventive
  • Measuring device in the application for measuring a level of a medium
  • Fig. 2 one half of a section through the mechanical design of the measuring device
  • Fig. 3 one half of a section during a vibration moment.
  • Fig. 1 the level measurement is shown schematically with the measuring device according to the invention.
  • the wall of the container 5 in which the medium 1 is located which is mechanical PatXML 5 / -I0
  • oscillatable unit 2 here the membrane attached.
  • the membrane 2 is excited for the measurements by the drive / receiving unit 3 to mechanical vibrations, or the
  • Drive / receiving unit 3 receives the mechanical vibrations and converts them, for example, into electrical signals, which are evaluated by the evaluation unit 4 in terms of process size. For example, it can be concluded from the characteristics of the oscillations such as frequency and amplitude whether the medium 1 covers the mechanically oscillatable unit 2 or not. On the basis of this information, it is then possible to display or monitor the achievement or undershooting of a filling level caused by the design of the mechanically oscillatable unit 2 and its attachment in the container 5. Therefore, the term level switch for such a measuring device according to the invention. Furthermore, however, gradual changes in the fill level or in other process variables such as density or viscosity can also be determined or suitably evaluated.
  • the mechanically oscillatable unit consists here of a base membrane 10, which is attached to a clamping 16. About this restraint 16 also takes place the attachment to the container with the medium.
  • the drive / receiving unit 3 is mounted, which is, for example, a polarized in the axial direction piezoelectric element.
  • the element 3 is, for example, firmly bonded to the membrane 12.
  • the base membrane 10 is divided into two membranes 11, 12 by a web 13, which is configured annularly.
  • the annular second diaphragm 12 connects, in the central region, the circular first diaphragm 11 is located.
  • the web 13 is firmly connected to the clamping 16, so that the two membranes 11, 12, although elastically coupled to each other, but are independent.
  • the resonances of the two membranes 11, 12 depend on their flexural rigidity and on their masses.
  • each of the two diaphragms 11, 12 has its own additional mass 14, 15, so that the first diaphragm 11 and the first additional mass 14 form a first oscillating system and the second diaphragm 12 and the second mass 15 form a second oscillating system.
  • both oscillating systems each have the same resonant frequency.
  • both membranes 11, 12 ideally have the same bending stiffness.
  • Fig. 3 a portion during vibration of the mechanically oscillatable unit is shown.
  • the two membranes 11, 12 oscillate at the same resonant frequency, but phase-shifted by 180 °.
  • the first membrane 11 moves in the figure to the inside and the second membrane 12 to the outside, wherein outside here refers to the direction of the process or the medium and the interior on the side facing away from the medium.
  • the frequency of the membrane oscillator is preferably less than 1400Hz to choose. This is done either by increasing the additional masses and / or by reducing the membrane thickness. Increasing the additional masses is usually accompanied by a reduction of the measuring effect. PatXML 7/10

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Thermal Sciences (AREA)
  • Electromagnetism (AREA)
  • Acoustics & Sound (AREA)
  • Analytical Chemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Biochemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
  • Reciprocating Pumps (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

L'invention concerne un dispositif de détermination et/ou de surveillance d'au moins une grandeur de processus sur un fluide (1), à l'aide d'au moins une unité (2) apte à osciller mécaniquement et d'au moins une unité (3) d'entraînement/réception qui met en vibration mécanique l'unité (2) apte à vibrer mécaniquement et qui reçoit les vibrations mécaniques de l'unité (2) apte à vibrer mécaniquement. L'invention consiste en ce que l'unité (2) apte à vibrer mécaniquement comprend au moins une première membrane (11) et une deuxième membrane (12) et en ce que la première membrane (11) et la deuxième membrane (12) sont accouplées mécaniquement l'une à l'autre.
PCT/EP2007/063065 2006-12-12 2007-11-30 Dispositif de détermination et/ou de surveillance d'une grandeur de processus WO2008071563A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006058926.2 2006-12-12
DE102006058926.2A DE102006058926B4 (de) 2006-12-12 2006-12-12 Vorrichtung zur Bestimmung und/oder Überwachung einer Prozessgröße

Publications (2)

Publication Number Publication Date
WO2008071563A2 true WO2008071563A2 (fr) 2008-06-19
WO2008071563A3 WO2008071563A3 (fr) 2009-05-14

Family

ID=39399580

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2007/063065 WO2008071563A2 (fr) 2006-12-12 2007-11-30 Dispositif de détermination et/ou de surveillance d'une grandeur de processus

Country Status (2)

Country Link
DE (1) DE102006058926B4 (fr)
WO (1) WO2008071563A2 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016124365A1 (de) * 2016-12-14 2018-06-14 Endress+Hauser SE+Co. KG Vibronischer Sensor mit Temperaturkompensation

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5345811A (en) * 1992-04-01 1994-09-13 Parker Hannifin Corporation Fluid density sensor and system
US5452267A (en) * 1994-01-27 1995-09-19 Magnetrol International, Inc. Midrange ultrasonic transducer
EP0807924A2 (fr) * 1996-05-18 1997-11-19 Endress + Hauser GmbH + Co. Transducteur à son ou ultrason
EP0927987A2 (fr) * 1997-12-30 1999-07-07 Endress + Hauser Gmbh + Co. Dispositif transducteur sonore

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH646252A5 (en) * 1978-12-22 1984-11-15 Grieshaber Vega Kg Device for detecting a predetermined filling level in a container
DE3618798A1 (de) * 1986-06-04 1987-12-10 Nord Micro Elektronik Feinmech Verfahren zum messen einer die eigenschwingung eines messwandlers beeinflussenden physikalischen groesse
DE3740598C2 (de) * 1987-11-30 1998-03-26 Grieshaber Vega Kg Schwingeinheit für Füllstand-Vibrations-Grenzschalter
NL8801836A (nl) * 1988-07-20 1990-02-16 Enraf Nonius Delft Inrichting voor het bepalen van het niveau van het grensvlak tussen een eerste en een tweede medium in een reservoir.
US7043969B2 (en) * 2002-10-18 2006-05-16 Symyx Technologies, Inc. Machine fluid sensor and method
DE102005044725B4 (de) * 2005-09-19 2014-06-26 Endress + Hauser Gmbh + Co. Kg Membranschwinger zur Bestimmung und/oder Überwachung einer Prozessgröße eines Mediums in einem Behälter

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5345811A (en) * 1992-04-01 1994-09-13 Parker Hannifin Corporation Fluid density sensor and system
US5452267A (en) * 1994-01-27 1995-09-19 Magnetrol International, Inc. Midrange ultrasonic transducer
EP0807924A2 (fr) * 1996-05-18 1997-11-19 Endress + Hauser GmbH + Co. Transducteur à son ou ultrason
EP0927987A2 (fr) * 1997-12-30 1999-07-07 Endress + Hauser Gmbh + Co. Dispositif transducteur sonore

Also Published As

Publication number Publication date
DE102006058926B4 (de) 2020-09-24
DE102006058926A1 (de) 2008-06-19
WO2008071563A3 (fr) 2009-05-14

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