EP0105174B1 - Capacitive high-frequency continuous furnace - Google Patents

Capacitive high-frequency continuous furnace Download PDF

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Publication number
EP0105174B1
EP0105174B1 EP83108345A EP83108345A EP0105174B1 EP 0105174 B1 EP0105174 B1 EP 0105174B1 EP 83108345 A EP83108345 A EP 83108345A EP 83108345 A EP83108345 A EP 83108345A EP 0105174 B1 EP0105174 B1 EP 0105174B1
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EP
European Patent Office
Prior art keywords
furnace
frequency
gas source
capacitive high
continuous furnace
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.)
Expired
Application number
EP83108345A
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German (de)
French (fr)
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EP0105174A1 (en
Inventor
Hans-Christian Dipl.-Ing. Grassmann
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Siemens AG
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Siemens AG
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Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP0105174A1 publication Critical patent/EP0105174A1/en
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Publication of EP0105174B1 publication Critical patent/EP0105174B1/en
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/46—Dielectric heating
    • H05B6/60—Arrangements for continuous movement of material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/32—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action
    • F26B3/34—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action by using electrical effects
    • F26B3/343—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action by using electrical effects in combination with convection
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B7/00—Drying solid materials or objects by processes using a combination of processes not covered by a single one of groups F26B3/00 and F26B5/00

Description

Die Erfindung bezieht sich auf einen kapazitiven Hochfrequenzdurchlaufofen zur thermischen Behandlung von Textilgütern, insbesondere von Chemiefaserkabeln, bei dem die Elektroden an einen Hochfrequenzgenerator angeschlossen sind und der Ofeninnenraum mit einer Luftquelle verbunden ist.The invention relates to a capacitive high-frequency continuous furnace for the thermal treatment of textile goods, in particular chemical fiber cables, in which the electrodes are connected to a high-frequency generator and the interior of the furnace is connected to an air source.

Mit diesem Oberbegriff wird auf eine Anordnung Bezug genommen, wie sie beispielsweise aus der DE-OS 28 17 067 bekannt ist. Bei dieser Anordnung werden die Chemiefaserkabel auf einem geerdeten Siebband mit Öffnungen durch den Ofen transportiert. In den Ofenraum wird Heißluft eingeblasen und durchströmt die Faserkabel. Hierdurch wird zusätzlich zur kapazitiven Trockung eine Heißlufttrocknung erreicht und das Gut auf dem Siebband fixiert.With this preamble reference is made to an arrangement as is known for example from DE-OS 28 17 067. With this arrangement, the chemical fiber cables are transported through the oven on an earthed sieve belt with openings. Hot air is blown into the furnace chamber and flows through the fiber cables. As a result, hot air drying is achieved in addition to capacitive drying and the material is fixed on the sieve belt.

Hochfrequenzöfen der vorgenannten Art haben sich gut zur Erwärmung der verschiedensten Materialien bewährt. Die mögliche Erwärmungsleistung des Ofens ist u. a. wesentlich durch die zulässige Feldstärke beschränkt, oberhalb derer elektrische Durchschläge auftreten. Bei vorgegebener Leistung sind damit im allgemeinen auch die baulichen Abmessungen festgelegt. Will man nun derartige Behandlungsanlagen in eine Gesamtanlage integrieren, so wäre es jedoch häufig von Interesse, wenn man mit verringertem Bauvolumen auskommen könnte.High-frequency furnaces of the aforementioned type have proven themselves well for heating a wide variety of materials. The possible heating performance of the oven is u. a. essentially limited by the permissible field strength above which electrical breakdowns occur. For a given performance, the structural dimensions are generally also determined. If you now want to integrate such treatment systems into an overall system, it would often be of interest if you could get by with a reduced construction volume.

Die Aufgabe der vorliegenden Erfindung besteht daher darin, einen kapazitiven Ofen der eingangs genannten Art so auszubilden, daß bei gegebenen Abmessungen die zugeführten elektrischen Leistungen gesteigert werden können, oder umgekehrt, daß bei vorgegebener Leistung die Abmessungen verringert werden können, wobei aber trotzdem in jedem Betriebszustand ein sicherer elektrischer Betrieb vorhanden sein soll.The object of the present invention is therefore to design a capacitive furnace of the type mentioned in such a way that the electrical power supplied can be increased for given dimensions, or vice versa, that the dimensions can be reduced for a given power, but nevertheless in any operating state safe electrical operation should be available.

Diese Aufgabe wird erfindungsgemäß durch das Kennzeichen von Anspruch 1 gelöst, wonach der Durchlaufofen auf Innenraumüberdrücke zwischen 1,5 und 6 bar ausgelegt ist und durch die Luftquelle im Ofeninnenraum ein in diesem Bereich liegender Überdruck erzeugt wird. Beim Absinken des Überdruckes im Ofeninnenraum unter einem vorgegebenen Wert wird die Spannung des Hochfrequenzgenerators selbsttätig verringert oder abgeschaltet. Da die Durchschlagsfeldstärke weitgehend dem Druck proportional ist, läßt sich auf diese Weise die pro Ofenvolumen umsetzbare Energiedichte ohne die Gefahr eines Durchschlages erhöhen.This object is achieved according to the invention by the characterizing part of claim 1, according to which the continuous furnace is designed for interior pressures between 1.5 and 6 bar and an overpressure in this area is generated by the air source in the interior of the furnace. When the overpressure in the furnace interior drops below a predetermined value, the voltage of the high-frequency generator is automatically reduced or switched off. Since the breakdown field strength is largely proportional to the pressure, the energy density that can be implemented per furnace volume can be increased in this way without the risk of breakdown.

Das Arbeiten mit hohen Drücken hat außerdem noch den erheblichen technischen Vorteil, daß auch die Verdampfungstemperatur entsprechend ansteigt, so daß z. B. noch bei 130°C keine Verdampfung stattfindet und damit in diesem Temperaturbereich nur unter Anwesenheit von Feuchtigkeit stattfindende Vorgänge besser beherrscht werden. Ein solcher Fall liegt z. B. beim nassen Fixieren von Faserkabeln vor.Working at high pressures also has the considerable technical advantage that the evaporation temperature rises accordingly, so that, for. B. there is still no evaporation at 130 ° C and thus in this temperature range only taking place in the presence of moisture processes are better controlled. Such a case lies e.g. B. before wet fixation of fiber cables.

Anhand einer Zeichnung sei die Erfindung näher erläutert.The invention will be explained in more detail with reference to a drawing.

Das auf einem Förderband 8 antransportierte mäanderförmig gefaltete Faserkabel 3 gelangt über eine aus Gummiwalzen 12 bestehende Dichtungsschleuse 12 mit Einführteil 11 auf ein in Richtung des Pfeiles 5 laufendes geerdetes metallisches Förderband 4, welches als Elektrode wirkt. Über dem Faserkabel 3 ist eine Hochfrequenzelektrode 21 vorgesehen, die über einen Koppelkondensator 22 mit einem Hochfrequenzgenerator 2 von z. B. 15 MHz verbunden ist. Nach der thermischen Behandlung verläßt das Faserkabei 3 den Ofen über eine weitere Druckschleuse 13 und wird von einem Förderband 15 zu einem weiteren Anlagebauteil transportiert. Das wesentlich Neue ist nun darin zu sehen, daß dieser Hochfrequenzofen gleichzeitig als Drucktrockner ausgebildet ist, d. h., das Gehäuse des Ofens 1 ist auf einen Innenraumüber druck von z. B. 4 bar ausgelegt. Zur Erzeugung dieses Druckes ist als Gasquelle eine Druckluftquelle 6 vorgesehen, die mit dem Ofeninnenraum verbunden ist. Die Druckluft kan gleichzeitig zur Verstärkung der Heizung vorgeheizt sein. Wie durch die Leitung 7 angedeutet, kann auch ein Teil der Luft aus dem Ofen wieder abgezogen und im geschlossenen Kreislauf geführt werden, z. B. um Feuchte zu beseitigen. Dies kann z. B. durch Kondensation in einem Wärmetauscher 71 geschehen, aus dem dann das Kondensat abgeführt wird (Pfeil 72).The meandering folded fiber cable 3, which is transported on a conveyor belt 8, passes via a sealing lock 12 consisting of rubber rollers 12 with an insertion part 11 to a grounded metallic conveyor belt 4 running in the direction of the arrow 5, which acts as an electrode. Over the fiber cable 3, a high-frequency electrode 21 is provided, which via a coupling capacitor 22 with a high-frequency generator 2 of z. B. 15 MHz is connected. After the thermal treatment, the fiber web 3 leaves the furnace via a further pressure lock 13 and is transported by a conveyor belt 15 to a further system component. The essentially new thing can now be seen in the fact that this high-frequency furnace is simultaneously designed as a pressure dryer, i. that is, the housing of the furnace 1 is on an interior pressure of z. B. designed 4 bar. To generate this pressure, a compressed air source 6 is provided as the gas source and is connected to the interior of the furnace. The compressed air can also be preheated to boost the heating. As indicated by line 7, part of the air can also be withdrawn from the oven and conducted in a closed circuit, for. B. to eliminate moisture. This can e.g. B. done by condensation in a heat exchanger 71, from which the condensate is then removed (arrow 72).

Der im Ofeninnenraum hersschende Druck p wird durch ein Meßglied 63 erfaßt und kann z. B. in einem Regler 61 zum Regeln des Luftdruckes verwendet werden. Wesentlich ist jedoch, daß dieses Druckmeßglied mit einem Überwachungsglied 62 verbunden ist, das bei einem Abfallen des Druckes unter einen vorgegebenen Wert, z. B. infolge einer undichten Schleuse oder einer. sonstigen Undichtigkeit, die Spannung des Hochfrequenzgenerators 2 verringert oder die Anlage abschaltet. Dies ist insofern wichtig, da infolge des höheren Druckes auch mit entsprechend höheren Feldstärken gearbeitet wird, die dann bei einem Absinken des Druckes zu elektrischen Überschlägen führen würden. Wird beispielsweise bei einem Ofen ohne Überdruck mit 0,5 bis 5 kV pro cm Feldstärke gearbeitet, so kann in dem erfindungsgemäßen Ofen bei einem Druck von 4 Bar die zulässige Feldstärke leicht verdoppelt werden, ohne daß es zu Überschlägen kommt.The prevailing in the furnace interior pressure p is detected by a measuring element 63 and can, for. B. can be used in a controller 61 to regulate the air pressure. It is essential, however, that this pressure measuring element is connected to a monitoring element 62 which, if the pressure drops below a predetermined value, e.g. B. due to a leaky lock or. other leak, the voltage of the high-frequency generator 2 is reduced or the system is switched off. This is important because, as a result of the higher pressure, work is carried out with correspondingly higher field strengths, which would then lead to electrical flashovers if the pressure drops. If, for example, an oven without overpressure is operated with 0.5 to 5 kV per cm field strength, the permissible field strength can easily be doubled in the oven according to the invention at a pressure of 4 bar without arcing.

Unter dem Begriff « Gas seit auch Dampf von entsprechendem Druck und Temperatur verstanden werden.The term «gas has also been understood to mean steam of the appropriate pressure and temperature.

Claims (4)

1. Capacitive high-frequency continuous furnace for the thermal treatment of textile products, in particular of man-made fibre cables, wherein electrodes are connected to a high-frequency generator and the inside of the furnace is connected to a gas source, characterised in that the furnace (1) is designed to withstand excess internal pressures between 1.5 and 6 bar, that an excess pressure in this region is produced in the interior of the furnace by the gas source (6), and that when the excess pressure in the interior of the furnace lowers to a predeterminable value the voltage of the high-frequency generator (2) is automatically reduced or switched off.
2. A capacitive high-frequency continuous furnace as claimed in Claim 1, characterised by elastic pressure seals (12, 13) at the input and output.
3. A capacitive high-frequency continous furnace as claimed in Claim 1, characterised by the use of a gas source (6) with a heating device.
4. A capacitive high-frequency continuous furnace as claimed in Claim 1. characterised in that a superheated steam generator serves as a gas source.
EP83108345A 1982-09-06 1983-08-24 Capacitive high-frequency continuous furnace Expired EP0105174B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3233069 1982-09-06
DE19823233069 DE3233069A1 (en) 1982-09-06 1982-09-06 CAPACITIVE HIGH-FREQUENCY CONTINUOUS

Publications (2)

Publication Number Publication Date
EP0105174A1 EP0105174A1 (en) 1984-04-11
EP0105174B1 true EP0105174B1 (en) 1987-04-15

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EP83108345A Expired EP0105174B1 (en) 1982-09-06 1983-08-24 Capacitive high-frequency continuous furnace

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EP (1) EP0105174B1 (en)
DE (2) DE3233069A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4115408A1 (en) * 1991-05-10 1992-11-12 Sicowa Verfahrenstech METHOD AND DEVICE FOR DRYING SLUDGE OR DAMP DUMP
DE102010001483A1 (en) * 2010-02-02 2011-08-04 BSH Bosch und Siemens Hausgeräte GmbH, 81739 Food product preparing method, involves bringing food product between two array elements of cooking appliance, where gaseous atmosphere present between food product and one array element is changed into physical parameter in defined manner

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2247388B1 (en) * 1973-10-12 1977-08-05 Anrep Rene
GB1532372A (en) * 1976-10-07 1978-11-15 Sagami Chem Res Dehydration and incineration of sample material
DE2817067A1 (en) * 1978-04-19 1979-10-25 Siemens Ag CAPACITIVE HIGH FREQUENCY OVEN FOR DRYING FOLDED FIBER CABLES, IN PARTICULAR CHEMICAL FIBER CABLES
US4334366A (en) * 1980-09-24 1982-06-15 Jetsonic Processes, Ltd. Sonic energy perforated drum for rotary dryers
US4485564A (en) * 1980-11-14 1984-12-04 Aktiebolaget Edane Komponenter Method of carrying out the drying of wooden objects

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Publication number Publication date
EP0105174A1 (en) 1984-04-11
DE3371025D1 (en) 1987-05-21
DE3233069A1 (en) 1984-03-08

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