WO2020207873A1 - Dispositif de mesure des propriétés physiques d'un liquide avec bande de détection - Google Patents

Dispositif de mesure des propriétés physiques d'un liquide avec bande de détection Download PDF

Info

Publication number
WO2020207873A1
WO2020207873A1 PCT/EP2020/059224 EP2020059224W WO2020207873A1 WO 2020207873 A1 WO2020207873 A1 WO 2020207873A1 EP 2020059224 W EP2020059224 W EP 2020059224W WO 2020207873 A1 WO2020207873 A1 WO 2020207873A1
Authority
WO
WIPO (PCT)
Prior art keywords
container
sensor
liquid
electrically conductive
conductive layer
Prior art date
Application number
PCT/EP2020/059224
Other languages
German (de)
English (en)
Inventor
Olaf Nahrwold
Rene PEKKOLA
Tanja Claus
Sigrid HASENBANK
Boris Traber
Jens Hofmann
Stefan Sindlinger
Original Assignee
Carl Freudenberg 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 Carl Freudenberg Kg filed Critical Carl Freudenberg Kg
Publication of WO2020207873A1 publication Critical patent/WO2020207873A1/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
    • G01F23/26—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 variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields
    • G01F23/263—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 variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors
    • G01F23/268—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 variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors mounting arrangements of probes

Definitions

  • the invention relates to a device for measuring physical
  • Electronic level sensors for determining the level of a liquid in a container usually work with the capacitive measuring principle. Thereby the capacity between two plates becomes one
  • Such a level sensor is described, for example, in WO 2016130848 A1 and US 2019/077292 A1.
  • the object of the present invention is to create a device for measuring physical properties of a liquid, which has a small footprint and can be easily integrated into containers filled with liquid. Another object is to enable the device to be used widely in a wide variety of containers. Another task is to determine the position of the liquid surface in the container.
  • a flat sensor strip on the inner contour was recognized as advantageous, i.e. to be attached to the inner wall of the container.
  • the device according to the invention is used to measure physically
  • the liquid can be an operating material of a machine or system, e.g. to gear oil.
  • the device comprises a container, for example made of sheet metal, and a capacitive sensor with two or more spaced electrodes.
  • a sensor strip is advantageously attached to the inner contour of the container, the sensor strip having an electrically conductive and an electrically insulating layer.
  • As part of the container there is also a Understood container seal.
  • a band is understood to mean a flat and elongated shape.
  • the sensor tape can be glued or welded to the surface of the container, for example, or inserted into the inner contour of the container by clipping or locking.
  • the electrically insulating layer rests on the inner contour of the container. A gap is formed between the electrically conductive layer and the surface of the container, into which the liquid can penetrate.
  • One electrode of the capacitive sensor is formed by the electrically conductive layer and the other electrode of the capacitive sensor is formed by the container.
  • the container is also designed to be electrically conductive, at least in the area of its electrode function. If the container is not made of an electrically conductive material, the electrodes are in the
  • Integrated sensor tape and two or more electrically conductive layers form the electrodes. This enables capacitive measurement between the electrically conductive layers as electrodes.
  • the electrically conductive layer and the region of the inner contour of the container opposite it each form electrodes of a capacitive sensor.
  • This capacitive sensor enables the capacitance value in the space between the electrodes to be determined.
  • the capacitance value depends on the medium that is located between the electrodes.
  • the capacitance value depends, among other things, on the relative permittivity of the
  • Dielectric e G (permittivity or dielectric constant).
  • Such a device can advantageously be used in containers of the most varied of shapes. Even in tight and
  • the sensor tape can be inserted into angled containers.
  • Another advantage is the simple adaptation of the device: the sensor strip can be easily adjusted to the correct size by cutting it to length. Since the electrodes of the capacitive sensor, in contrast to flat, parallel spaced electrodes according to the prior art, have a complex profile, a corresponding conversion of the measurement data is required for the various characteristics of the physical properties. However, this is easily possible using currently available data processing technologies and can be implemented by an evaluation unit.
  • the sensor strip is made of flexible and stretchable material, in particular made of elastomer and / or nonwoven.
  • a material with good resistance to the liquid must be selected in each case.
  • the elastomer can be, for example, an acrylonitrile-butadiene rubber (NBR),
  • the nonwoven fabric can be, for example, carbon fiber nonwovens, metal fiber nonwovens and polymer nonwovens.
  • the nonwoven fabric can be, for example, in particular a nonwoven fabric with fibers that contain a polymer selected from the group of polyesters, polyamides, polyacrylates, polymethacrylates,
  • Polyoxyalkylenes polyacids and copolymers thereof, natural polymers such as cellulose or modified natural polymers such as viscose, polyurethanes, polysilicon, as well as polyolefins and polymers which are hydrophilized by chemical or physical processes.
  • the nonwoven fabric can also be a spunbond nonwoven, in particular a wet nonwoven, dry nonwoven, meltblown nonwoven or electrostatically spun nonwoven.
  • the electrically conductive and electrically insulating layers can either be made of elastomer, both of nonwoven fabric, or one layer of nonwoven fabric and one layer of elastomer.
  • both layers of the sensor tape are made of a flexible material (for example elastomer or non-woven fabric), the sensor tape can do very well follow the curved housing wall, for example.
  • the sensor tape can easily and easily be applied to any geometry of an inner contour of a container.
  • Another embodiment would be the insulating layer made of elastomer and the conductive layer made of a flexible metal, which is
  • This metal can either be bonded to the elastomer with an adhesion promoter. However, it can also be produced in the form that it is overmolded or coextruded so that a thin layer of the insulating elastomer surrounds the metal wire.
  • the senor strip is manufactured using strand extrusion. This development is advantageous in terms of production, since the
  • Sensor tape can be manufactured particularly easily and inexpensively.
  • the measured physical property can in particular be the level of the liquid in the container. If the liquid is the operating material of a machine or system, a sufficient presence of the operating material can be monitored and ensured.
  • the sensor strip is oriented vertically in the container and extends in particular from the lowest point to the highest point of the container.
  • the sensor band can alternatively extend over the height of a vertical side part of the container, ie be positioned between the bottom and the lid of the container, and is oriented vertically.
  • the filling level of the liquid in the container can thus be determined particularly well.
  • the physical property measured can also be the composition of the liquid, in particular the formation of a suspension, ie the presence of solid particles in the liquid. There is also the possibility of a
  • disperse phase e.g. metallic abrasion
  • dispersion medium i.e. the liquid, e.g. gear oil
  • the sensor strip is segmented in the vertical direction and the electrically conductive layer has at least two segments, each segment serving to measure a physical property.
  • the electrically conductive layer has at least two segments, each segment serving to measure a physical property.
  • the measurement results of the two segments can be evaluated separately.
  • This offers additional functionalities for an extended determination of the state of the liquid, namely the determination of two different physical properties.
  • a segment located in the lower region of the container can be used to determine the composition of the liquid. For example, this can
  • the device has an evaluation unit which is connected to the capacitive sensor in terms of data transmission.
  • the connection can be wired or wireless (radio, NFC, WLAN, etc.).
  • the associated characteristic of the physical property is determined for a capacitance value determined in the capacitive sensor. I.e. there is an assignment of an expression of the physical property to a measured capacitance value.
  • the evaluation unit has a memory unit in which setpoint values of at least one physical property are stored.
  • setpoint values maximum values and / or minimum values can also be stored, and the evaluation unit can output a warning if they are exceeded or not reached.
  • a contact head is arranged, which is connected to the evaluation unit for data transmission, the contact head being received in particular in a bore in the container.
  • the contact head serves as a measuring head and closes the measuring circuit of the capacitive sensor. The inclusion in a bore makes assembly of the
  • Another embodiment describes the possibility of attaching the sensor tape to different locations in the container. This results in the
  • Developments of the invention also represent advantageous developments of the invention in combination with one another - insofar as this is technically sensible.
  • the device for measuring can be used, for example, in a truck transmission in order to determine the oil level and the oil condition in an oil pan there. Due to wear, for example the gear wheels of a transmission, there is the possibility of sedimentation of metallic abrasion on the bottom of an oil pan. This means that there is a suspension in the lower area of the oil pan. Oil (dispersion medium) and metallic abrasion (disperse phase) form a dispersion consisting of substances of different dielectric properties
  • FIG. 1 shows a first variant of a device for measuring physical properties of a liquid with a sensor strip in one
  • FIG. 2 shows a second variant of a device for measuring physical properties of a liquid with a sensor strip in one
  • FIG. 3 shows a third variant of a device for measuring physical properties of a liquid with a sensor strip in one
  • Container attached sensor tape 5a and b show a segmented sensor strip in a plan view and a sectional illustration
  • FIG. 7 shows the first variant of a device for measurement.
  • Fig. 1 shows a first variant of a device 10 for measuring physical properties of a liquid with a sensor tape 3, the
  • Sensor strip 3 forms a space in which the physical properties of the liquid are measured.
  • Liquid L is only partially shown. So is part of the
  • a sensor strip 3 is attached to the inner contour 6 of the container 2.
  • the sensor strip 3 has an electrically conductive layer 4 and an electrically insulating layer 5, which are in direct contact with one another. Thanks to the electrically insulating layer 5, the electrically conductive layer 4 is at a distance from the inner contour 6 of the container 2. This enables liquid L to penetrate into the space between the inner contour 6 of the container 2 and the electrically conductive layer 4.
  • opposite areas of the inner contour 6 of the container 2 each form electrodes of a capacitive sensor 1.
  • This capacitive sensor 1 makes it possible to determine the capacitance value in the space between the electrodes.
  • the capacitance value depends on the medium that is located between the electrodes. So can indirect
  • the capacitance value can be used to determine whether there is liquid L or air or what composition the liquid L has.
  • the capacitance value is also called the relative permittivity of the dielectric e G
  • Fig. 2 shows a second variant of a device 10 for measurement
  • the electrically insulating layer 5 of the sensor strip 3 has a U-shaped configuration. In the area of its legs, the electrically insulating layer 5 is connected to the container 2 at its inner contour 6.
  • the electrically conductive layer 4 is applied to the inside, on the bottom of the U-shaped electrically insulating layer 5.
  • the mode of action of this device for measurement 10 is analogous to the mode of action of the variant described in FIG.
  • Fig. 3 shows a third variant of a device 10 for measuring physical properties of a liquid L with a sensor tape 3.
  • the sensor tape 3 is designed such that the electrically conductive layer 4 is in the form of a round rod or a flexible wire, which by means of a web of electrically insulating layer 5 is connected to the container 2.
  • the mode of action of this device for measurement 10 is also analogous to the mode of action of the variant described in FIG.
  • FIG. 4 shows a detailed representation of the sensor strip 3 attached to the inner contour 6 of a container 2.
  • the sensor strip 3 also has this
  • Embodiment an electrically conductive layer 4 and an electrically insulating layer 5.
  • the sensor strip 3 can be connected to the container 2, for example, by gluing, welding or locking, which is not detailed in FIG. It cannot be seen in the sectional illustration that liquid L can penetrate into the space between the electrically conductive layer 4 and the inner contour 6 of the container 2. However, this is only due to the special positioning of the cut.
  • the sensor strip 3 can be designed according to one of the variants of FIGS. 1 to 3, so that the space between the electrodes results in which
  • Liquid L can penetrate and in which the capacitance value is measured.
  • the sensor strip 3 is aligned vertically in the container 2. It extends from the lowest point of the container 2 to the highest point of the container 2. At the top of the
  • a contact head 8 is arranged in a bore in the wall of the container 2, which closes the measuring circuit and with a
  • Evaluation unit 7 is connected for data transmission.
  • Evaluation unit 7 has a storage unit 9 in which setpoint values can be stored. By determining the capacitance value, it is possible, for example, to infer a filling height h of the container 2.
  • Fiq. 5a and b show an alternative embodiment with a segmented sensor strip 3 in a plan view and a section at position B-B.
  • the electrically insulating layer 5 is also designed here in a U-shape.
  • the electrically conductive layer 5 is segmented in the vertical direction, i. H.
  • a first segment 4.1 is provided in a lower area and a second segment 4.2 is provided in the upper area.
  • the two segments 4.1 and 4.2 are each connected in terms of data transmission to an evaluation unit 7 (not shown). This makes it possible that in the area of the first segment 4.1 and the second segment 4.2
  • FIGS. 6a and 6b show the segmented sensor strip 3 from FIG. 5b with different states of the liquid L in the container 2. While the lower segment 4.1 is intended to determine the composition of the liquid L, namely the presence and characteristics of a suspension, the upper segment is used 4.2 the determination of a filling level h of the liquid L. A capacitance value measured in the space between the first segment 4.1 and the inner contour 6 of the container 2 corresponds to a
  • the capacity value is significantly increased compared to a stored target value. If a maximum value stored in the evaluation unit 7 is exceeded, a warning can then be output by the evaluation unit 7, for example.
  • a capacitance value measured in the space between the second segment 4.2 and the inner contour 6 of the container 2 corresponds to a specific fill level of the liquid L.
  • the same capacitance value is measured as in the example of FIG. 6b. This means that the liquid L has the same fill level in both examples.
  • the capacitor is formed here between the two electrically conductive layers 4.1 and 4.2 along the sensor strip 3.
  • the liquid L now fills the space between these two electrically conductive layers 4.1 and 4.2 and thus influences the capacitive signal to be measured.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Electromagnetism (AREA)
  • Thermal Sciences (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)

Abstract

L'invention concerne un dispositif (10) de mesure des propriétés physiques d'un liquide (L) dans un récipient (2) comprenant un récipient (2) et un capteur capacitif (1) à électrodes espacées. Selon l'invention, une bande de détection (3) est fixée sur le contour intérieur (6) du récipient (2). La bande de détection (3) possédant au moins une couche électriquement conductrice (4) et au moins une couche électriquement isolante (5), et la couche électriquement isolante (5) repose contre le contour intérieur (6) du récipient (2). L'une des électrodes du capteur capacitif (1) est formée par la couche électriquement conductrice (4) et l'autre électrode du capteur capacitif (1) est formée par le récipient (2). Un dispositif de ce type présente un faible encombrement et peut être facilement intégré dans des récipients remplis de liquide. Le niveau de remplissage et l'état du liquide peuvent ainsi être surveillés de manière fiable.
PCT/EP2020/059224 2019-04-09 2020-04-01 Dispositif de mesure des propriétés physiques d'un liquide avec bande de détection WO2020207873A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102019109274.4 2019-04-09
DE102019109274.4A DE102019109274A1 (de) 2019-04-09 2019-04-09 Vorrichtung zur Messung physikalischer Eigenschaften einer Flüssigkeit mit Sensorband

Publications (1)

Publication Number Publication Date
WO2020207873A1 true WO2020207873A1 (fr) 2020-10-15

Family

ID=70189927

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2020/059224 WO2020207873A1 (fr) 2019-04-09 2020-04-01 Dispositif de mesure des propriétés physiques d'un liquide avec bande de détection

Country Status (2)

Country Link
DE (1) DE102019109274A1 (fr)
WO (1) WO2020207873A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05273032A (ja) * 1992-03-25 1993-10-22 Nippon Oil & Fats Co Ltd タンク内容物排出装置
DE102005009093A1 (de) * 2005-02-22 2006-09-07 Benjamin Hoffmeier Abstimmverfahren bei Vorrichtungen zur füllrichtigen kapazitiven Füllmessung mithilfe von Meßkondensatoranordnungen
EP2759812A1 (fr) * 2013-01-29 2014-07-30 Rechner Industrie-Elektronik GmbH Procédé et dispositif de mesure capacitive du niveau de remplissage de liquides ou produits en vrac
WO2016130848A1 (fr) 2015-02-11 2016-08-18 Flextronics Ap, Llc Carter d'huile avec capteur capacitif intégré pour la mesure du niveau d'huile
US20190077292A1 (en) 2017-09-13 2019-03-14 Intersens Overfill prevention system probe tanks for transport of liquid fuels and corresponding overfill prevention system

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU5390700A (en) * 1999-06-21 2001-01-09 Bent Thorning Bensen A/S Radiofrequency resonant circuit sensing device, method of its production, and uses
EP1210566A4 (fr) * 1999-09-09 2006-07-05 Labarge Inc Systeme de carburant
DE10057934A1 (de) * 2000-11-22 2003-12-11 Volkswagen Ag Verfahren und Vorrichtung zum Messen des in einem Behälter, insbesondere einem Kraftstofftank, befindlichen Flüssigkeitsvolumens
DE102004053639A1 (de) * 2004-11-04 2006-05-11 Benjamin Hoffmeier Verfahren und Vorrichtung zur füllrichtigen kapazitiven Füllstandsmessung und Qualitätsbestimmung über den gesamten geforderten Temperaturbereich
DE102008035635B4 (de) * 2008-07-31 2020-11-05 Gerd Reime Vorrichtung zur kapazitiven Messung eines Füllstands oder eines Pegels eines Mediums
DE102013112025A1 (de) * 2013-10-31 2015-04-30 Endress + Hauser Gmbh + Co. Kg Vorrichtung zur Bestimmung oder Überwachung des Füllstands eines Mediums in einem Behälter

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05273032A (ja) * 1992-03-25 1993-10-22 Nippon Oil & Fats Co Ltd タンク内容物排出装置
DE102005009093A1 (de) * 2005-02-22 2006-09-07 Benjamin Hoffmeier Abstimmverfahren bei Vorrichtungen zur füllrichtigen kapazitiven Füllmessung mithilfe von Meßkondensatoranordnungen
EP2759812A1 (fr) * 2013-01-29 2014-07-30 Rechner Industrie-Elektronik GmbH Procédé et dispositif de mesure capacitive du niveau de remplissage de liquides ou produits en vrac
WO2016130848A1 (fr) 2015-02-11 2016-08-18 Flextronics Ap, Llc Carter d'huile avec capteur capacitif intégré pour la mesure du niveau d'huile
US20190077292A1 (en) 2017-09-13 2019-03-14 Intersens Overfill prevention system probe tanks for transport of liquid fuels and corresponding overfill prevention system

Also Published As

Publication number Publication date
DE102019109274A1 (de) 2020-10-15

Similar Documents

Publication Publication Date Title
EP0824671B1 (fr) Detecteur capacitif de niveau
WO2002050498A1 (fr) Procede et dispositif de mesure de niveaux
DE102009059202A1 (de) Sensormodul
DE10041731A1 (de) Pegelmeßvorrichtung
DE102008034922A1 (de) Wälzlagerkäfig
DE102005017451A1 (de) Türgriff für Kraftfahrzeuge mit einem kapazitiven Näherungssensor
WO2020207873A1 (fr) Dispositif de mesure des propriétés physiques d'un liquide avec bande de détection
DE102007008729B4 (de) Abtastelement zur Erfassung eines Verschleißwegs eines Bremsbelags
EP1001260A1 (fr) Ensemble capteur pour un milieu gazeux ou liquide comme diélectrique
DE10063557B4 (de) Verfahren und Vorrichtung zum Messen von Pegelständen
EP1521066A1 (fr) Système de mesure capacitive de niveau
DE102013205305B4 (de) Vorrichtung zur Einstellung eines Betriebsparameters einer elektrischen Einrichtung
DE19754093C2 (de) Kapazitive Meßeinrichtung zur Feststellung des Füllstandes eines Behälters
DE19638734C2 (de) Vorrichtung zur selektiven Detektion und zur Ortung von Leckageflüssigkeiten an Abdichtungssystemen
DE3515767A1 (de) Vorrichtung zur ermittlung und ueberwachung der beschaffenheit, des zustands und des fuellstands einer druckfluessigkeit
DE19858828A1 (de) Kapazitiver Sensor
WO2006117033A1 (fr) Capteur capacitif pour saisir un niveau d'huile avec electrode de protection et chauffage
EP3732449B1 (fr) Réservoir de liquide comprenant un système intégré pour la détection du niveau de remplissage
DE10011312B4 (de) Drucksensor
EP1339978B1 (fr) Dispositif et procede de mesure de debit d'injection d'injecteurs, en particulier pour vehicules a moteur
DE102014015188A1 (de) Vorrichtung und Verfahren zur Überwachung eines Trocknungselements in einer Batterie
DE19823190B4 (de) Füllstandssensor mit Schwimmer
WO2003081175A1 (fr) Gyro-detecteur d'inclinaison
DE102008030074B4 (de) Kraftstofffüllstandsgebereinheit mit variablem Widerstandswert und mehreren Steigungen
DE102019120701A1 (de) Linearführungswagen und Verfahren zur Detektion der Befüllung eines Linearführungswagens mit Schmierstoff

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 20717134

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 20717134

Country of ref document: EP

Kind code of ref document: A1