US1873808A

US1873808A - Means for heating a conductive body

Info

Publication number: US1873808A
Application number: US432787A
Authority: US
Inventors: Edgar L Bailey
Original assignee: Individual
Current assignee: Individual
Priority date: 1930-03-03
Filing date: 1930-03-03
Publication date: 1932-08-23
Anticipated expiration: 1949-08-23

Description

E. L. BAILEY 1,873,808 Y MEANS FOR HEATING A coNDUcTIvE BDVY''A Filed March S, 1930 2 Sheets-Sheet l Aug. 23, 1932.

ATTORNEYS.

Aug. 23, 1932. f E. L. BAILEY 1,873,808

MEANS FOR HEATING A CONDUCTIVE. BODY Filed March 3. 1930 2 Sheets-Sheet 2 INVENTOR fdjar L. az'lqy.

MMM

ATTORNEYS* Patented Aug. 23,' 1932 nnen r.. or nunon'. nomen :murs ron mme a connudrm nonv Application nea :man amo. :um 1ro. 482,187.

` l ous hazard to workmen coming in yproximity a thereto. With the prior devices, the portions of the body which are unfavorably located in the path of the flux do not develop as high temperatures as fthe other parts of l the body, and when uniform heating is desired such apparatus is unsatisfactory for y this reason.

The main objects of thisinventionare to.

\ providek improved means for heating bodies by electric induction; to provide means of this kind in. which a non-oscillating circuit of substantially low frequency may be employed for obviatng the danger of a. high frequency oscillating circuit; to provide an improved heating device in which bodies of regular and irregular shapes may be heated uniformly with equal security.

Further objects of this invention are to provide inductive heating apparatus sothrough which bodies may be progressively moved without interrupting the apparatus; to provide improved means in heating apparatus of this kind for heating the ends and other portions of bodies which are not advantageously located with respect to the main inductive -flux of the apparatus, which may also be used to concentrate the effect of a local 'luxupon selected parts of a body; and to provide means of this kind which do not require electrical connections with the stationary parts of the apparatus, lthereby permitting relative movement of the selectable heating means and the main flux producing'mechanism during operation.

- 5 An illustrative embodiment of my iivenf 'whichis a apted tolprovide a path for the tion isshown inthe accompanying drawings, inwhich: Y Fig. 1 is a view in side elevation of my improved heating apparatus' showing a diagrammatic illustration of a power circuit.

Fig. 2 is a view in left end elevation ofthe heating apparatus shown in Fig. 1.

Fig. 3 isa view in vertical section taken `on the line 3-3 of Fig. 2, looking inthe direction indicated by the arrows.

Fig. 4 is a fra entary horizontal sectional view of a col ector coil and heating unit taken on the line of Figi 2, looking in the direction indicated by the arrows.

. Fig. 5-is a view in s'ide elevation of a heating apparatus embodying a modified form of my invention.

Fig. 6 is a view in end elevation of the r apparatus shown in Fi 5. Fig. 7 is an enlargedg sectional view taken 65 on the linev 7-7 of Fig.v 5, showing a"well known construction of insulated duplex wire.

In the form shown in Figs. 1, 2, 3 and 4, the heating apparatus includes a coil 1 having substantially twenty turns, each consisting Vof two No. 1 B S. gauge wires 2 which are connected in parallel with the

terminals

3 and 4 ofa generator 5. The wires 2, are wound helically upona frame which comprises uper an lower pairs 6 and 7, respectively, of 75 ongitudinal ribs in which notches 8 are formed for receiving thev wires 2 and retaining the convolutions of the coil in spaced relation. Y

The upper pair of ribs or bars 6 are slls- 80 pended `from an overhead structure (not shown)l by depending bracket arms 9, and the lower pair of ribs 7 rests upon a metal plate 10 which may be supported upon .a floor or other suitable structure. Mounted on 'the 86 pairof ribs 6, externally ofthe coil 1 ita metal `plate l11. The plates 10 and 11, preferably. com rise iron or other suitable metal,

magnetic flux' of the coil. .-f l0` wire 18 are wound, is mounted on the left end of the platform 15, as viewed in Fig. 1.

This coil is located in a plane substantially normal to the longitudinal axis of the coil 1. The terminal portions 19 and 20 of the coil 16 are electrically connected to a pancake coil 21, which is suspended substantially within the collector coil and located at the central portion thereof, as viewed in.\Fig. 4. There are substantially ten turns of No. 6 wire in the pancake coil 21.

Electrically connected by conductors 22 and 23, in parallel with the pancake coil 21, is

a second pancake coil 24, which is mounted on a support 25, secured to the right end of the platform 15 as viewed in Fig. 1. The metal body 16 is located on the platform between the pancake coils 21 and 22 which, in the form shown, are slightly spaced from the ends of the body 16.

In the form shown in Figs. 4 and 5 the solenoid 1 of substantially the same construction as the solenoid 1, described above, is mounted on a frame having notched longitudinal upper ribs 6, and lower ribs 7. -Mounted on the upper and lower ribs 6 and 7 respectively, are metal plates 1] and 10', for concentrating the magnetic field of the coil, which is created by the current from a generator 5 that is electrically connected with the terminal portions of the coil 1 by'` conductors 26 and 27.

A laminated metal core 28 preferably formed of superimposed plates of iron is located at the upper central portion of the interior of the coil 1 This core is suspended from the upper plate 11 by U shaped members 29 and 30. Resting upon the end portion of the core 28, are

coils

31 and 32,

each having substantially twenty turns of wire. Pancake coils 33 and 34 aredetachably ,connected by couplings 35 and 36, to the

coil

31 and 32 on the core 28 respectively.

Rails 12 are provided in the lower portion of the coil 1 for supporting wheels 13 'of a carriage 14', on vwhich a metal body 37 may be positioned in the interior of the coil 1 'and between the coils 33 and 34.

In pperation, a low voltage, non-oscillating circuit. having a substantially low frequency is supplied to the solenoid coils 1 and 1 in each form of my invention. Satisfactory results have been obtained by using 200 volts, at 180 cycles; giving a current of 360 amperes. This current sets up a magnetic field within the coil, which is induced into the metal body therein, setting up hysteresi's and eddy currents which develop heat in the metal of the body. The sides, top and bottom of the body are more advantageously located with respect to the flux of the coil than the ends thereof, and as a result these portions are heated directly by the main flux of the coil to a greater degree than the ends. With the form of my invention shown in Figs. 1 to 4 inclusive, a current is induced in the collector coil 16 which is fed to the pancake coils 21 and 24- These coils cause the ends of the body to heat so that all portions thereof are substantially the same temperature. If it is desired, the coils 21 and 24 may be placed in close proximity to any selected portion of the body so as to concentrate the eiect of the flux of the coil on such selected portion.

With the formof my invention shown in Figs. 5 and 6, the magnetic flux of the core 28 induces currents into the

coils

31 and 32 on the respectively opposite ends thereof. The induced currents in the

coils

31 and 32 are fed to the pancake coils 33 and 34 respectively, which are located in close proximity Both forms of the above heating apparatusy ,are particularly adapted for heating automobile bodies. refrigerator casings, etc., so as to dryor bake enamel thereon, but it has many diversified uses. With the apparatus shown in Figs. 1 to 4 inclusive it is possible to progressively convey bodies through the solenoid 1 by employing several trucks. By the term enamel as herein used in the specification, and claims, vis meant any and all suitable materials such as paint, varnish or other similarcoating used to finish the surface of a metal body.

Although but two specifc'embodiments of this invention have been herein shown and described. it will be understood that numerous. details of the construction shown may be altered or omitted without departing from the spirit of this invention, as defined by the following claims.

I claim:

1. In heating apparatus, an electric circuit. an outer coil electrically connected in said circuit for receiving conductive bodies and inducing heat generating current therein, a

collector coil in proximity of said outer coil` and means electrically connected with said collector coil for augmenting the effect of said outer coil on selected parts of said body.

`2. In heating apparatus, p

Y y iesin a substantially central position therein so as to use said bodiesas a magnetic core for'said coil, an electric circuit connected with said' coil for inducing heat generatingcurrents in the-sides of said bodies, and means inductivel)1 energizedb the iiuxof said coil fo heating the ends o said bodies.

' the sides of sai 3. In heating apparatus, a coil, a support-in said coil for retainin metal bodies in a substantially central position 'therein so as to use said `bodies as a magnetic core for said `coil,

an electric circuit connected with vsaid coil for inducing heat generating currents in the sides of saidbodics, a collector coil insaid first mentioned coil, and a pair of .iiux creating units electrically connected with said collector coil, one `located at each end of said body.

' 4. In heating apparatus, a coil a support in said coil for retarinin metal substantially central posltion therein sc as to use said bodies as a magnetic core for said coil, an electric circuit connected with said coil for inducin bodies, means or collecting a coil a sup rt .y in-said coil for 'retaining metal bo Po means for pr 8. In heatin apparatus for metal bodies,

ucm a magnetic field having the capacity of emp oying said metal bodies as a core,.and an auxiliary flux generating cally connected with sai collecting means for heating selected parts of said bodies.

EDGAR L. BAILEY.v

"asmaI heat generatin currents in 'I some of the flux generated by said coil, and a pair of auxiliary units adapted to be energlzed by the energy collected b said means for heating the ends of said y.

5. In heatin apparatus, an electric circuit i including a coil ada ted to receive a conducytive body for induclng heat generating currents therein, means externally located with res ct to said coil for concentrating the mag- ,netlc flux .thereof said'bodyserving as an 1nhaving its sides ex osed to.

ternal core and' the main flux thereof, and means in uctively energized by the fiuxof said coil for heating the ends of said body. Y

' 6. Heating apparatus comprising a solenoid coil an electric circuit for energizing said coi to produce a magnetic fiel therein, supports` extending lon 'tudinally through sai coil, a carriage shifta ly mounted on said supports for transferring a body through said. magnetic field so as to induce heat generatingcurrents in the sides'thereof,

` and means mounted on said carriage at one end of said body and inductively energized .by said magnetic fluxl for heating saidend.

7. Heating apparatus comprising a solel I noid coil, an` electric circuit for energizing said coil to produce ama supports extending longitudinally through said'coil, a carriage shiftably mounted on said supports for l transferring a body through said magneticfield so as to induce heat generating currents in the .sides"thereof,

gnetic field therein,-

a collector coil o'n'said-carriage in the path ofthe flux of said ield, and an auxiliary flux `generating unit electrically connected with said collector coil for ooncentratin the'efect Aof said lflux on a selected portion o said body.-

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