EP0105174B1 - Four continu capacitif à haute fréquence - Google Patents

Four continu capacitif à haute fréquence 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
Authority
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
Other languages
German (de)
English (en)
Other versions
EP0105174A1 (fr
Inventor
Hans-Christian Dipl.-Ing. Grassmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of EP0105174A1 publication Critical patent/EP0105174A1/fr
Application granted granted Critical
Publication of EP0105174B1 publication Critical patent/EP0105174B1/fr
Expired legal-status Critical Current

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Classifications

    • 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

Definitions

  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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).
  • 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.

Claims (4)

1. Four capacitif à haute fréquence et à passage continu, pour le traitement thermique de matières textiles, en particulier de câbles de fibres chimiques, dont les électrodes sont connectées à un générateur de haute fréquence et dont l'intérieur communique avec une source de gaz, caractérisé en ce que le four (1) est conçu pour des surpressions internes entre 1,5 et 6 bars, que la source de gaz (6) produit une surpression comprise dans cette plage à l'intérieur du four et que, en cas d'abaissement de la surpression dans le four au-dessous d'une valeur préfixée, la tension du générateur de haute fréquence (2) est automatiquement réduite ou coupée.
2. Four selon la revendication 1, caractérisé par des dispositifs élastiques d'étanchéité à la pression (12, 13) à l'entrée et à la sortie.
3. Four selon la revendication 1, caractérisé par l'utilisation d'une source de gaz (6) avec un dispositif de chauffage.
4. Four selon la revendication 1, caractérisé en ce que la source de gaz est un générateur de vapeur surchauffée.
EP83108345A 1982-09-06 1983-08-24 Four continu capacitif à haute fréquence Expired EP0105174B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19823233069 DE3233069A1 (de) 1982-09-06 1982-09-06 Kapazitiver hochfrequenzdurchlaufofen
DE3233069 1982-09-06

Publications (2)

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

Family

ID=6172567

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83108345A Expired EP0105174B1 (fr) 1982-09-06 1983-08-24 Four continu capacitif à haute fréquence

Country Status (2)

Country Link
EP (1) EP0105174B1 (fr)
DE (2) DE3233069A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4115408A1 (de) * 1991-05-10 1992-11-12 Sicowa Verfahrenstech Verfahren und einrichtung zum trocknen von schlamm oder feuchtem schuettgut
DE102010001483A1 (de) * 2010-02-02 2011-08-04 BSH Bosch und Siemens Hausgeräte GmbH, 81739 Verfahren zum Zubereiten von Lebensmitteln sowie Gargerät mit einem Garraum

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2247388B1 (fr) * 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 (de) * 1978-04-19 1979-10-25 Siemens Ag Kapazitiver hochfrequenzofen zum trocknen von gefalteten faserkabeln, insbesondere chemiefaserkabeln
US4334366A (en) * 1980-09-24 1982-06-15 Jetsonic Processes, Ltd. Sonic energy perforated drum for rotary dryers
DE3164226D1 (en) * 1980-11-14 1984-07-19 Mikrovagsapplikation Mva Ab A method of carrying out the drying of wooden objects

Also Published As

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

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