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Publication numberUS1900573 A
Publication typeGrant
Publication dateMar 7, 1933
Filing dateNov 19, 1930
Priority dateNov 19, 1930
Publication numberUS 1900573 A, US 1900573A, US-A-1900573, US1900573 A, US1900573A
InventorsElmer D Mcarthur
Original AssigneeGen Electric
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Electric heating apparatus
US 1900573 A
Abstract  available in
Images(1)
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Claims  available in
Description  (OCR text may contain errors)

Maich 7, 1933. E. D. MCARTHUR, 1,900,573

I ELECTRIC HEATING APPARATUS Filed Nov. 19, 19:50

Fig. l.

Inventor-z Tim-war D. McAr'thur,

His Attorney.

f UNITED ,s1' r|-:s- PATENT osrlcs E1 .11 '1: n n. 'l tcan'rnun, or-scmnc-rmr, mrw You aasmnos. 'no em Insomnia I comm, A CORPORATION O! m YORK nac'rarc nna'rmc mum:-

a uuubn filcdlovelber 19, mo. Serial Re. 40am.

7 My invention relates to electric heatingapparatus, more particularly to electric heaters of the'type in which the-heat is nerated in the heated body itself. and has or its object simple, reliable and efi'ective electric heating apparatus utilizing currents of high frequenc1es.

Myinvention has particular application to heating apparatus wherein the material or efictrtlildfes electrically lconnlecteiilJ tohabsoalrce o ig requency'supp y w ere yt e o y1s heated by an electrostatic field. In the application of this t found that the portion of the body adjacent the source of high frequency supply is heated with greater rapidity than the remaining more remotely situated Iportion. In accordance with my invention rovide in one form thereof a series of pairs 0 heating electrodes 1 with separate source of high frequency supply which are arranged on opposite sides of I the pairs of plates, together*with=means for assmgthe' dy to be heated in succession etween the pairs of plates whereby it is heated uniformly. My'invention is especially useful in the heating of food products, such as milk and meat, for sterilization, cooking or other purposes. It has wide application, however, to eating processes-wherein aluniform rate of heating is desirable. This method of heating is to be distinguished from the usual method of heating in which heat is ap lied to the ex-' terior ofthe hody-and-must e transmitted by conduction into the interior portions. Such methodsrequire a longer heating period and furthermore, the outer portions of the a body are subjected to the maximum temperainterior portions. which is of especial disadvantage where the heating period is quite critical and must be closely controlled.

For a more complete understanding of my invention reference should be had to the accompanying drawing in which Fig. 1 is a view showing in simplified partially diagrammatic form apparatus forapplying high frequency current to the heating plates in accordance m with my invention, while Fig. 2 is a diagrambody to be heated is placed between spacede of heater it has been ture for a greater length of time than the matic representation of heating apparatus to be heated is placed between the plates in s seed or electrically insulated relation with t em, for example in a suitable container 13 made of an electrically insulating material,

such. as glass. s

It will be understood'that the electron dis" charge device 12 operates in a manner similar to a high frequency short wave tube oscillator,

such as used in radio transmission, and produces currentof similar high frequencies, on

the order of twenty to fifty million cycles per second. In the particular system shown the plates 10 and 11 are connected respectively to the grid 14 and the anode or plate 15 of the discharge device, suitable inductances 16 I and 16a being included in the respective connections so as to form a resonant high frequency oscillation circuit. At these very high requencies the inductance in the conductors 3 themselves may be suflicient to reduce this desired resonant condition in w ich case no auxiliary inductance would be provided.

. The filamentary cathode 17 of the discharge device is heated from a-suitable source of alternating current which is connected to thecathode through a suitable transformer 18. Radio frequency coils 19 and 20 are included in the sides respectively of the cathode circuit. A tap 21 on the secondary of the transformer 18 leads through a-irrid leak resistance 22 and capacity 23 connected in parallelwith each other, and. through a choke coil 24 to the grid 14. A suitablesource of electrical supply, for example a direct current source of 500 volts or more, is connected to the to 21 and the plate 15, a radio frequency cho e coil 25 being included in the connection with the plate; The 'positive side Q It is very effective in the heating of various of the supplysource is connected to the plate and the negative side to tap 21.

It will be understood that the frequency generated in the oscillation circuit including the two plates may be varied by changing the constants of the circuit, for example by varying the distance between the two plates liquids, and materials containing moisture, such as articles of food including meats, vegetables, eggs, milk, etc, when for some reason it is undesirable to apply heat externally as from an hot oil bath or an oven.

It'mayalso be used in drying laundry.

In the use of the heating a paratus for some materials I have found t at the electrode of each pair which is nearer the source of, high frequency supply apparently has the greater heatingefiect, the portion of the material adjacent this electrode being heated more rapidly than the remaining portions.

In the arrangement shown, the material ad-.

jacent the plate 10 is heated most rapidly. One explanation of this is the distortion of theelectrostatic field due to the difference in the lengths of the conductors leading from the two lates to the source of'supply. The plate 10 in nearer the source of high freuency'suplp y constituted by the discharge evice 12 a the lead to the other plate 'mustpass the first plate and distorts the field due to its prox- 1m1y.' p

Asshown in Fig. 2,1provide in accordance with one'form of my invention a plurality of pairsof plates'26 to '29 inclusive which are mounted preferablyin e ually spaced relation and with corresponding plates in alignment, together with suitable conveying means, such as a continuous conveyor 30 passing successively between the pairs of plates. The sources of high frequency supply 31 to 34 inclusive for the respectivepairs of plates are placed on alternate opposite sides of the conveyor. It will be'understood that the sources 31 and 34 are suitable sources of high frequency current, such as shown i Fig. 1, there being a separatesource con nected to. each pair of plates." The material to be heated is passed on the conveyor in the containers-13 successively between the 'opgosite sides to the higher rate of heating s the shorter lead and cons'e- 'quently gives the greater heating efi'ect since pairs of plates and consequently the material in each container is subjected alternately on as a result the material is heated uniformly throughout. It will be understood that the number of airs of heating plates may be varied as desired to give the desired temperature and rate of heatingl While I have shown a particular embodi ment' of my-invention, it will be understood, of course, that I do not wish to be limited thereto since many modifications may be made, and I, therefore, contemplate by, the appended claims to cover any such modifications as fall within the true spirit and scope of my invention.

What I claim as new and desire to protect by Letters Patent of the United States is:

1. Electric heating apparatus comprising a plurality of pairs of electrodes, aseparate source of high frequency supply for each of said pairs of electrodes, one of the electrodes of each pair giving a greater heating e'liect than the other and means forpassmg the material to be heated between said pairs of electrodes in succession in such manner that different ortions of said materialare adjacent the e ectrode givingthe greater heating efiect whereby said material is heated uniformly.' Y

2. Electric heatingap aratus comprisinga plurality of airs ofe ectrodes, a se arate source of big frequency current su p y for each of said pairs of electrodes, the'e ectrodesof each pair' being respectively closely and remotely situated with respect toth'eir supply source, and means for passing the material to be heated between the electrodes of a said pairs in succession in such manner that a given portion of the'materlal is alternately adjacent said closely and remotely situated electrodes. v

3. Electric heating up aratus comprisin a plurality of pairs of'e ectrodes, means or electrodes of said pairs in succession, a source of high frequenc current for each of said pairs of electro es', said sources being .arranged on opposite sides of the path of travel of said material in such a manner that each of said sources is res ectively closely and remotely situated wit res set to its electrodes whereby a predetermine portion of saidmaterial passes adjacent the electrodes giving difierent rates of heating.

In witness whereof I ave hereunto set my hand this 18th day of November,1930. v ELMER D. MQARTHUR.

passing the material to be heated between the r

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2417953 *Jun 2, 1944Mar 25, 1947Stupakoff Ceramic Mfg CoHigh temperature electrically-heated furnace
US2421334 *Apr 26, 1944May 27, 1947Ind Rayon CorpMethod of treating twisted filamentary materials
US2433067 *Jun 26, 1942Dec 23, 1947George F RussellMethod of and apparatus for highfrequency dielectric heating
US2436732 *May 12, 1944Feb 24, 1948Carborundum CoHigh-frequency electric field heating
US2469709 *Aug 22, 1946May 10, 1949Doblin Percy WApparatus for melting chocolate and other confections
US2471744 *May 29, 1944May 31, 1949Rca CorpMethod of and means for measuring microwave power
US2472193 *Oct 19, 1943Jun 7, 1949Clayton BenjaminElectronic drying of foots
US2473041 *Aug 9, 1945Jun 14, 1949Swift & CoHigh-frequency electrostatic field apparatus for egg pasteurization
US2474420 *Jul 16, 1945Jun 28, 1949Ross M CarrellHigh-frequency dielectric heating apparatus
US2474649 *Jun 21, 1944Jun 28, 1949Dehydration IncTreatment of vegetable tissue
US2483623 *Oct 15, 1943Oct 4, 1949Clayton BenjaminApparatus for process of drying oil
US2488164 *Mar 2, 1946Nov 15, 1949A W BrickmanMethod of processing meat products
US2488165 *Mar 4, 1946Nov 15, 1949A W BrickmanMethod of processing meat products
US2491687 *Jun 26, 1945Dec 20, 1949Henry Nutt JohnApparatus for baking dough products
US2494191 *Jun 14, 1945Jan 10, 1950Salomon NeumannStarch degradation process
US2495415 *Oct 17, 1945Jan 24, 1950Raytheon Mfg CoHigh-frequency electromagnetic cooking apparatus
US2495429 *Oct 8, 1945Jan 24, 1950Raytheon Mfg CoMethod of treating foodstuffs
US2495435 *Jan 14, 1947Jan 24, 1950Raytheon Mfg CoMethod of treating foodstuffs
US2497501 *Apr 27, 1946Feb 14, 1950Ross M CarrellTreatment of coffee, etc.
US2505025 *Jun 1, 1945Apr 25, 1950Girdler CorpHigh-frequency treating system
US2510796 *Sep 28, 1944Jun 6, 1950Rca CorpArt of pasteurizing milk, etc.
US2551360 *Jan 31, 1946May 1, 1951Rca CorpArt of subjecting effervescent materials to an electric field
US2569075 *Mar 21, 1946Sep 25, 1951Schade Arthur LPrevention of enzymatic discoloration of potatoes
US2576902 *Nov 13, 1943Nov 27, 1951Republic Steel CorpMethod for flow brightening electrodeposited tin on tinplate
US2577220 *Aug 27, 1945Dec 4, 1951Winfree Robert NProcess for raising dough temperatures
US2590580 *Jul 26, 1946Mar 25, 1952Ben J ChromyHigh-frequency corn popping apparatus
US2595502 *Aug 1, 1946May 6, 1952Allis Chalmers Mfg CoVariable capacity circuit for dielectric heating apparatus
US2601067 *Mar 24, 1948Jun 17, 1952Raytheon Mfg CoCoffee brewing
US2603142 *Mar 19, 1947Jul 15, 1952Miller Cyril CApparatus for popping corn by highfrequency radiation
US2603741 *Dec 12, 1946Jul 15, 1952Goodrich Co B FHigh-frequency heating
US2605383 *Feb 24, 1947Jul 29, 1952Raytheon Mfg CoMeans for treating foodstuffs
US2612595 *Feb 12, 1948Sep 30, 1952Girdler CorpAdjustable electrode assembly for high-frequency heating systems
US2614045 *Apr 7, 1950Oct 14, 1952British Soya Products LtdProcesses for the treatment of soya beans and other leguminous seeds
US2623451 *Sep 11, 1948Dec 30, 1952Swift & CoSausage manufacturing apparatus
US2631223 *Jun 28, 1946Mar 10, 1953United Shoe Machinery CorpApparatus for high-frequency dielectric progressive bonding
US2642000 *Nov 29, 1944Jun 16, 1953Hoe & Co RInk drying equipment for web printing machines
US2678138 *Aug 8, 1950May 11, 1954Gen Motors CorpFeeding apparatus
US2685518 *Apr 2, 1952Aug 3, 1954Swift & CoSausage manufacturing process
US2737955 *Feb 8, 1950Mar 13, 1956Koerber & Co KgMethod and apparatus for drying tobacco products
US2744990 *Jan 24, 1951May 8, 1956Gen ElectricUltrahigh frequency heating apparatus
US2816034 *Mar 10, 1951Dec 10, 1957Wilson & Co IncHigh frequency processing of meat and apparatus therefor
US2829977 *Jun 29, 1954Apr 8, 1958Jamin N V CMethod for the preparation of confectionary masses
US2877118 *Sep 23, 1953Mar 10, 1959Swift & CoContinuous sausage manufacture and apparatus therefor
US2985573 *Apr 22, 1958May 23, 1961Saint GobainPreparation of metallic elements
US3053667 *Sep 25, 1958Sep 11, 1962Zwanenberg S Fabrieken N VProcess for the preservation of non-homogeneous meat
US3291036 *Mar 17, 1965Dec 13, 1966Internat Food Machine CorpResistance heating cooking device
US3394011 *Jan 3, 1964Jul 23, 1968Swift & CoContinuous production of cheese curd
US3482507 *Oct 2, 1967Dec 9, 1969Swift & CoApparatus for the continuous production of cheese curd
US4003774 *Sep 20, 1974Jan 18, 1977Baumgartner Papiers S.A.Stabilization of tows of filamentary material
US4409455 *Mar 5, 1982Oct 11, 1983Cincinnati Milacron Inc.Dielectric heating section for blow molding machine
US4420670 *Mar 5, 1982Dec 13, 1983Cincinnati Milacron Industries, Inc.Control for dielectric heating in blow molding machine
US5290583 *Apr 2, 1992Mar 1, 1994David ReznikMethod of electroheating liquid egg and product thereof
US5415882 *Jan 22, 1993May 16, 1995Knipper; Aloysius J.Producing extended refrigerated shelf life food without high temperature heating
US5533441 *Mar 8, 1995Jul 9, 1996Reznik; DavidApparatus for rapidly cooling liquid egg
US5641423 *Jun 6, 1995Jun 24, 1997Stericycle, Inc.Radio frequency heating apparatus for rendering medical materials
US5863580 *Jun 27, 1997Jan 26, 1999Reznik; DavidElectroheating methods
US7606394Apr 2, 2007Oct 20, 2009Jbs Swift & CompanyMethods and systems for administering a drug program related to livestock
US7613330Apr 3, 2007Nov 3, 2009Jbs Swift & CompanyMethods and systems for tracking and managing livestock through the production process
US7892076May 15, 2007Feb 22, 2011Swift & CompanyMultibar apparatus and method for electrically stimulating a carcass
US8050462Oct 8, 2009Nov 1, 2011Jbs Usa, LlcMethods and systems for administering a drug program
US8379935Oct 21, 2011Feb 19, 2013Swift & CompanyMethod for administering a drug program to determine whether an animal has been given a drug
US8660315Feb 14, 2013Feb 25, 2014Jbs Usa, LlcMethod for administering a drug program to determine whether an animal has been given a drug
DE761090C *Nov 8, 1936Jan 11, 1954Siemens AgVerfahren zur Hochfrequenzbehandlung, insbesondere zur Erwaermung von Gegenstaenden
DE845082C *Oct 2, 1948Jul 28, 1952Telefunken GmbhEinrichtung zur Behandlung von Schuettgut mit elektrischer Hochfrequenzenergie
DE884454C *Oct 14, 1950Jul 27, 1953Patelhold PatentverwertungEinrichtung zur Behandlung von organischen und chemischen Stoffen mittels kurzer elektrischer Wellen
DE935079C *Apr 19, 1945Nov 10, 1955Siemens AgAnordnung zur Behandlung von Koerpern im elektrischen Hochfrequenzfelde nach dem Durchlaufverfahren
DE965392C *Aug 18, 1944Jun 6, 1957Siemens AgVerfahren zum Beheizen von Teigstuecken bis zum durch die gewuenschte Oberflaechenbraeune oder Kruste gekennzeichneten Ausback-Endzustand
DE1009745B *Mar 9, 1953Jun 6, 1957Robert Zeisberg Dipl IngVerfahren und Vorrichtung zum Behandeln von Katalysatoren oder Absorptionsmitteln
Classifications
U.S. Classification219/776, 219/778, 34/252, 99/451, 65/DIG.400, 209/212, 204/164, 34/256
International ClassificationH05B6/78
Cooperative ClassificationY10S65/04, H05B6/782
European ClassificationH05B6/78F