US2871332A - Dielectric heating electrodes - Google Patents

Dielectric heating electrodes Download PDF

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Publication number
US2871332A
US2871332A US635489A US63548957A US2871332A US 2871332 A US2871332 A US 2871332A US 635489 A US635489 A US 635489A US 63548957 A US63548957 A US 63548957A US 2871332 A US2871332 A US 2871332A
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United States
Prior art keywords
electrodes
array
dielectric heating
electrode
conveyor
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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 - Lifetime
Application number
US635489A
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English (en)
Inventor
Northmore Raymond
Naylor Joseph Francis
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.)
T&T Vicars Ltd
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T&T Vicars Ltd
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Publication date
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Publication of US2871332A publication Critical patent/US2871332A/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
    • H05B6/64—Heating using microwaves
    • H05B6/78—Arrangements for continuous movement of material

Definitions

  • the present invention concerns dielectric heating electrodes and more particularly relates to such electrodes designed to ensure a heating eilect distributed in a desired manner across a wide moving surface.
  • Dielectric heating has been applied to many problems, including those in which articles on a moving surface such as a conveyor have to be treated; for instance the baking of biscuits, cakes, all classes of confectionery and bread and the drying of felt, carpets, textile and other goods.
  • Such applications have suffered from the disadvantage of unequal heating across the width of the conveyor to unequal voltage distribution across the electrodes of the system.
  • baking or dryin across its Whole width this was a serious disadvantage, as it was with a product that only required treatment over certain specified regions of the width when such regions did not coincide With those parts of the electrodes which exhibited a maximum voltage potential.
  • the disadvantage is particularly pronounced in cases where the width the conveyor is large compared with the wavelength of the generator employed i. e. long electrodes operating at frequencies, and is due to standing waves in the electrode array in addition to other incidentals causing irregularities in the field strength.
  • the object of the present invention is to provide an electrode array which is adjustable to enable the heating etfect of the electric field, throughout the length of the array, to be regulated as desired.
  • a dielectric heating electrode array for the treatment of articles moving through the field of the array comprises a plurality of adjustable elements by means of which the efiective area of the electrodes can be varied at different points along the length of the array.
  • This may conveniently be effected by providing fingers of suitable material, which fingers are sliclable within slots formed in one or more transverse electrode members extending across the whole Width of the array, so that movement of the fingers alters the external shape of the array in the plane thereof,
  • Suitable material for the adjustable elements would be aluminum, brass, copper, silver or any other metal or alloy of high electrical conductivity.
  • Fig. l is a diagrammatic plan View of one form of electrode array for dielectric heating of articles moving through the field of the array, and
  • Fig. 2 is a partial sectional elevation on the line Ill-il of Fig. 1.
  • a balanced output circuit is illustrated, the R. 1*. generator 5 being floating.
  • two arrays (generally designated 6) are provided, the circuit being completed by a plain metal electrode 7 which is not physically connected in circuit. It will be readily understood that the invention is equally applicable to unbalanced circuits, in which case one of the output terminals of the generator would be connected to the plain electrode.
  • Each array 6 comprises a number of fixed transverse electrodes 6a extending throughout the whole length of the array between end pieces 6b, and a plurality of fingers 6c mounted in slots in electrodes 6a so as to be adjustable in a direction across the width of the array.
  • a conveyor band 8 is shown travelling between arrays 6 and electrode 7, and articles to be treated, i. e. dried or baked, would be carried on this conveyor.
  • the conveyor could be dispensed with, but even in such cases the support of a conveyor band or belt is desirable. If conveyor 8 is constructed of metal it could replace electrode 7.
  • the arrays 6 are connected to the R. F. generator 5 by means of metal strips 9 of substantial width.
  • a dielectric heating electrode array for the treatment of articles moving through the field of the array comprising a series of fixed electrodes, a pair of end plates and a plurality of displaceable fingers, said fixed electrodes being disposed transversely between said end plates to form therewith a framework, and said fingers being mounted within slots formed in at least some of said transverse electrodes so as to be individually slidable therein, thereby to vary the effective area of said electrodes at different point along the length of the array.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Constitution Of High-Frequency Heating (AREA)
  • Surface Heating Bodies (AREA)
  • Drying Of Solid Materials (AREA)
US635489A 1956-01-28 1957-01-22 Dielectric heating electrodes Expired - Lifetime US2871332A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2871332X 1956-01-28

Publications (1)

Publication Number Publication Date
US2871332A true US2871332A (en) 1959-01-27

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ID=10916889

Family Applications (1)

Application Number Title Priority Date Filing Date
US635489A Expired - Lifetime US2871332A (en) 1956-01-28 1957-01-22 Dielectric heating electrodes

Country Status (3)

Country Link
US (1) US2871332A (enrdf_load_stackoverflow)
BE (1) BE554517A (enrdf_load_stackoverflow)
FR (1) FR1165289A (enrdf_load_stackoverflow)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3082710A (en) * 1958-06-24 1963-03-26 Radio Heaters Ltd Foodstuffs baking apparatus
US3356354A (en) * 1964-06-02 1967-12-05 Beljaev Anatoly Nikolaevich Apparatus for drying and hardening welding electrode coatings
US3701875A (en) * 1969-06-30 1972-10-31 Intertherm Ltd H. f. heating apparatus
US4007350A (en) * 1974-01-23 1977-02-08 Agence Nationale De Valorisation De La Recherche (Anvar) Plant for the heat treatment of objects by means of an electric field
US4012369A (en) * 1973-03-02 1977-03-15 Produits Chimiques Ugine Kuhlmann Monoazo chromiferous complex dyestuffs derived from naphthyl-azo-naphthalene, and process for their preparation
US5290490A (en) * 1990-06-29 1994-03-01 General Electric Company Method and apparatus for differentially heating and thermoforming a polymer sheet
US5300749A (en) * 1991-04-15 1994-04-05 Imatran Voima Oy Method and apparatus for the reduction of distance-dependent voltage increase of parallel high-frequency electrodes

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2479351A (en) * 1945-08-10 1949-08-16 Westinghouse Electric Corp High-frequency dielectric heating apparatus
US2640141A (en) * 1948-10-12 1953-05-26 Westinghouse Electric Corp Apparatus for dielectric heating

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2479351A (en) * 1945-08-10 1949-08-16 Westinghouse Electric Corp High-frequency dielectric heating apparatus
US2640141A (en) * 1948-10-12 1953-05-26 Westinghouse Electric Corp Apparatus for dielectric heating

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3082710A (en) * 1958-06-24 1963-03-26 Radio Heaters Ltd Foodstuffs baking apparatus
US3356354A (en) * 1964-06-02 1967-12-05 Beljaev Anatoly Nikolaevich Apparatus for drying and hardening welding electrode coatings
US3701875A (en) * 1969-06-30 1972-10-31 Intertherm Ltd H. f. heating apparatus
US4012369A (en) * 1973-03-02 1977-03-15 Produits Chimiques Ugine Kuhlmann Monoazo chromiferous complex dyestuffs derived from naphthyl-azo-naphthalene, and process for their preparation
US4007350A (en) * 1974-01-23 1977-02-08 Agence Nationale De Valorisation De La Recherche (Anvar) Plant for the heat treatment of objects by means of an electric field
US5290490A (en) * 1990-06-29 1994-03-01 General Electric Company Method and apparatus for differentially heating and thermoforming a polymer sheet
US5300749A (en) * 1991-04-15 1994-04-05 Imatran Voima Oy Method and apparatus for the reduction of distance-dependent voltage increase of parallel high-frequency electrodes

Also Published As

Publication number Publication date
BE554517A (enrdf_load_stackoverflow)
FR1165289A (fr) 1958-10-21

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