DE1909684B2 - Measuring cable for determining the temperature distribution of bulk materials or the like in silos - Google Patents
Measuring cable for determining the temperature distribution of bulk materials or the like in silosInfo
- Publication number
- DE1909684B2 DE1909684B2 DE19691909684 DE1909684A DE1909684B2 DE 1909684 B2 DE1909684 B2 DE 1909684B2 DE 19691909684 DE19691909684 DE 19691909684 DE 1909684 A DE1909684 A DE 1909684A DE 1909684 B2 DE1909684 B2 DE 1909684B2
- Authority
- DE
- Germany
- Prior art keywords
- measuring
- measuring cable
- cable
- silos
- determining
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
- G01K13/10—Thermometers specially adapted for specific purposes for measuring temperature within piled or stacked materials
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
- Insulated Conductors (AREA)
- Laying Of Electric Cables Or Lines Outside (AREA)
Description
3030th
Die Erfindung betrifft ein Meßkabel zur Ermittlung der Temperaturverteilujig von Schüttgütern in Silos mit einem Temperaturfühler enthaltenden Meßaderbündel. Bekannte Meßkabei sind als Rundkabei ausgeführt, deren Seele ein Meßaderbündel ist, über dessen Länge die Thermoelemente mit ihren Lötstellen verteilt sind. Es ist üblich, über dem Meßaderbündel einen Innenmantel anzubringen, darüber eine Runddrahtbewehrung als Tragelement, ein Stahldrahtgeflecht als Rutschsicherung und einen Außenmantel. Derartige Kabel sind relativ aufwendig in der Herstellung und entsprechend teuer. Es besteh« die Aufgabe, ein Meßkabel zu schaffen, das bei gleichen Eigenschaften weniger aufwendig aufgebaut und leichter ist. Darüber hinaus sollen die Eigenkapazitäten des Meßkabels, insbeiondere die Kapazität zwischen Seele und Tragelement, möglichst klein sein, um ein solches Kabel ohne den Einbau zusätzlicher Elektroden auch bei der kapazitiven Füllstandsmessung einsetzen zu können.The invention relates to a measuring cable for determining the temperature distribution of bulk materials in silos with a probe bundle containing a temperature sensor. Known measuring cables are designed as round cables, whose core is a bundle of measuring wires, over the length of which the thermocouples with their soldering points are distributed are. It is common practice to attach an inner jacket over the measuring wire bundle and round wire reinforcement over it as a support element, a steel wire mesh to prevent slipping and an outer jacket. Such Cables are relatively expensive to manufacture and use correspondingly expensive. The task at hand is to create a measuring cable that does not have the same properties complex and lighter. In addition, the internal capacities of the measuring cable, in particular the capacitance between the core and the supporting element should be as small as possible to avoid such a cable to be able to use the installation of additional electrodes for capacitive level measurement.
Eine Lösung der gestellten Aufgabe wird in einem Kabel gesehen, das dadurch gekennzeichnet ist, daß parallel zu dem Meßaderbündel und in der gleichen Ebene zwei Tragseile angeordnet sind und daß MeßtderbUndel und Tragseile mit einem Kunststoffmantel von ellipsenförmigem Querschnitt umgeben sind. Die Herstellung eines solchen Kabels, beispielsweise in flacher Ausführung, erfordert weniger Arbeitsgänge und weniger Material als bei den bisher üblichen Rundkabeln. Das MeßaderbPndol und die im Abstand dazu pa. allel angeordneten Tragseile werden mit einem Kunststoffmantel umspritzt, der zugleich als verbindendes Element zwischen Tragseilen und Meßaderbündel und als äußerer Schutz des Meßaderbündels dient.A solution to the problem is seen in a cable which is characterized in that parallel to the measuring wire bundle and in the same plane two supporting cables are arranged and that measuring bundle and suspension cables are surrounded by a plastic jacket with an elliptical cross-section. the Manufacture of such a cable, for example in a flat design, requires fewer operations and less material than with the previously common round cables. The measuring lead pndole and the distance to it pa. allel arranged suspension ropes are covered with a plastic sheath encapsulated, which at the same time acts as a connecting element between the suspension cables and the measuring wire bundle and serves as external protection of the measuring wire bundle.
Di» bei derartigen Meßkabeln, beispielsweise beim Ablassen eines Silos, erhebliche Zugkräfte in axialer Richtung auf den Kabelmantel ausgeübt werden, ist es von Vorteil, Tragseile mit besonderer Verseilung zu benutzen, die ein Abziehen des Mantels möglichst verhindern oder erschweren. Beispielsweise kann ein Tragseil des Tragseilpaares mit Rechtsschlag, das andere mit Linksschlag verseilt sein, und es können Tragseile mit sogenannter Strohverseilung benutzt werden. Infolge des Abgehens von der Rundbewehrung ist auch die Eigenkapazität des Kabels gemäß der Frfindung, insbesondere die Kapazität zwischen Tragseilen und Meß aderbündel, erheblich verkleinert. Wegen dieser klonen Eigenkapazität kann das Kabel auch gleichzeitig als Meßsonde für eine kapazitive Füllstandsmessung verwendet werden, die in bekannter Weise durch Aus wertung der Kapazitätsveränderung zwischen geeigne, angeordneten Elektroden, z. B. dem Meßkabel gegen über Zellenwand oder Einzelelementen des Meßkabr--. gegeneinander, durchgeführt «werden. Die Kapa;·:::: ändert sich bei der Füllung des Silos proportional nv< der Füllhöhe. Durch Verwendung geeigneter Werksioife für den Mantel, beispielsweise Polyäthylen, läßt sie'■■ der Temneraturgang der Kapazität zwischen Trageit ment und Meßaderbündel in einem nicht störenden Bereich halten, was Bedingung beim Einsatz des Meßkabels zur kapazitiven Füllstandsmessung ist.Since considerable tensile forces are exerted on the cable sheath in the axial direction with measuring cables of this type, for example when lowering a silo, it is advantageous to use suspension ropes with special stranding that prevent or make it more difficult to pull the sheath off. For example, one of the pair of carrying cables can be stranded with a right-hand lay, the other with a left-hand lay, and carrying cables with so-called straw stranding can be used. As a result of the departure from the round reinforcement, the intrinsic capacity of the cable according to the invention, in particular the capacity between supporting cables and measuring wire bundle, is considerably reduced. Because of this clone self-capacitance, the cable can also be used as a measuring probe for a capacitive level measurement, which in a known manner by evaluating the change in capacitance between suitable, arranged electrodes such. B. the measuring cable against cell wall or individual elements of the Meßkabr--. against each other. The capacity; · :::: changes when the silo is filled proportionally to nv < the filling level. By using suitable Werksioife for the jacket, for example polyethylene, they can '■■ keep the temperature curve of the capacitance between Trageit ment and measuring wire bundle in a non-disruptive area, which is a condition when using the measuring cable for capacitive level measurement.
Ein Beispiel eines Meßkabels nach der Erfindung is: in den Figuren dargestellt und im folgenden erläuten.An example of a measuring cable according to the invention is shown in the figures and explained below.
F i g. I zeigt in einer Seitenansicht den Aufbau de·. Meßkabels,F i g. I shows the structure of the · in a side view. Measuring cable,
F i g. 2 das Meßkabei im Querschnitt.F i g. 2 the measuring cable in cross section.
Fig. 1: Dem in bekannter Weise aufgebauten, mn. Thermoelementen versehenen Meßaderbündel 1 sind parallel zwei Tragseile 2 und 3 als Tragelemente zu geordnet, die sich in einem gewissen Abstand von dem Meßaderbündel in gleicher Ebene mit der Bündelachse befinden. Diese drei Teile sind mit einem Kunststoffmantel 4 umspritzt, der, wie in F i g. 2 zu sehen, in diesem Beispiel etwa ellipsenförmigen Querschnitt aufweist. Es ist aber auch möglich, annähernd einen kreisförmigen Querschnitt zu wählen. Um ein Abziehen des Mantels 4 durch in Bewegung befindliches Schüttgui zu verhindern, ist das Tragseil 2 mit Rechtsschlag, das Tragseil 3 mit Linksschlag verseilt und beide in der sogenannten Strohverflechtung ausgeführt. Bei geeigneter Bemessung des Abstandes zwischen Meßaderbündel 1 und den Tragseilen 2 und 3 kann die zwischen diesen Elementen auftretende Kapazität genügend klein gehalten werden, um das Kabel auch für die kapazitive Füllstandsmessung einsetzen zu können.Fig. 1: The constructed in a known manner, mn. Probe bundle 1 provided with thermocouples are parallel two suspension ropes 2 and 3 to be ordered as support elements, which are at a certain distance from the The probe bundles are in the same plane as the bundle axis. These three parts are covered with a plastic sheath 4, which, as shown in FIG. 2, in this example has an approximately elliptical cross-section. But it is also possible to choose an approximately circular cross-section. To remove the To prevent jacket 4 by moving Schüttgui, the support rope 2 with a right turn, the Carrying rope 3 stranded with left-hand lay and both executed in the so-called straw interlacing. With suitable Dimensioning of the distance between Messaderbündel 1 and the suspension cables 2 and 3 can be between These elements occurring capacitance are kept small enough to allow the cable to be capacitive To be able to use level measurement.
Claims (5)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH313668 | 1968-03-01 |
Publications (3)
Publication Number | Publication Date |
---|---|
DE1909684A1 DE1909684A1 (en) | 1969-10-02 |
DE1909684B2 true DE1909684B2 (en) | 1974-07-11 |
DE1909684C3 DE1909684C3 (en) | 1975-02-27 |
Family
ID=4249390
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19691909684 Expired DE1909684C3 (en) | 1968-03-01 | 1969-02-26 | Measuring cables for determining the temperature distribution of bulk goods or the like in silos |
Country Status (4)
Country | Link |
---|---|
DE (1) | DE1909684C3 (en) |
FR (1) | FR2002991A1 (en) |
GB (1) | GB1224973A (en) |
SE (1) | SE352444B (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE455820B (en) * | 1985-12-09 | 1988-08-08 | Geotronics Metaltech Ab | DEVICE FOR DETECTING THE SLAUGHTER LEVEL IN A METAL BATH |
SE463893B (en) * | 1987-09-28 | 1991-02-04 | Geotronics Ab | DEVICE FOR DETECTING THE LEVEL OF A BATTERY SURFACE OF A SMALL METAL BATH |
TWI440830B (en) * | 2012-01-18 | 2014-06-11 | Finetek Co Ltd | Liquid level sensor |
-
1969
- 1969-02-26 DE DE19691909684 patent/DE1909684C3/en not_active Expired
- 1969-02-27 SE SE268869A patent/SE352444B/xx unknown
- 1969-02-27 FR FR6905062A patent/FR2002991A1/fr not_active Withdrawn
- 1969-02-28 GB GB1098869A patent/GB1224973A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
DE1909684C3 (en) | 1975-02-27 |
DE1909684A1 (en) | 1969-10-02 |
GB1224973A (en) | 1971-03-10 |
SE352444B (en) | 1972-12-27 |
FR2002991A1 (en) | 1969-11-07 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
C3 | Grant after two publication steps (3rd publication) | ||
E77 | Valid patent as to the heymanns-index 1977 | ||
8320 | Willingness to grant licences declared (paragraph 23) | ||
8339 | Ceased/non-payment of the annual fee |