US2171080A - Induction heat transformer - Google Patents

Description

55 2- 9 39 G. B. ELY 2,171,080 I INDUCTION HEAT TRANSFORMER Filed May 4, 1938 2 Sheets-Sheet l ATTO R N EYS Aug. 29, 1939. cs. B. ELY 2,171,080

INDUCTION HEAT TRANSFORMER Filed May 4, 1938 4 2 Sheets-Sheet 2 a i U; Q

[Ill/[I i; w E k I, E Q}. Q muulmju H 2;. xgmm Q B m g Patented Aug. 29, 1939 UNITED STATES PATENT OFFICE 7 6 Claims.

This invention relates'to electrical heating apparatus and more particularly to an induction transformer unit type using alternating current and including an impedance coil composed of a conductor of magnetic character and a special characteristic core and outer casing of a similar magnetic nature.

The invention has for its principal object to secure higher efficiency with compactness of structure and minimization of cost of production as well as in maintenance and operation.

Another object is to provide standard induction heat transformer units of a given size and structural arrangement so as to be'variably assembled in heating apparatus installations of different ca pacities.

Other objects and advantages to be attained will hereinafter more fully appear in the following description. 7 g

The invention consists in the novel general construction and assembly and in parts and combinations and arrangements of parts as hereinafter set forth and claimed, reference being had to the accompanying drawings illustrating a practical adaptation of the invention, and in which Figure 1 is a view of a heating apparatus partly in side elevation and partly in vertical section;

Figure 2 is a view more or less schematic in 30 character and illustrating a heattransformer unit 'in'end elevation;

Figure 3 is a fragmentary view, on an enlarged scale, showing one corner portion of a heat transformer unit in end elevation; and

Figure 4 is a fragmentary sectional view on the same scale as Figure 3, the section being taken substantially on the line 4-4 of Figure 2.

Referring now to the drawings, the heat transformer unit will be first described. This unit which is conventionally shown fully assembled in Figure 2, but in structural detail in Figure 3, is

of the type having only a primary winding, and

culation of air therethrough, while for practical.

50 interchangeable assembly of the units the same Y are preferably made in square or rectangular cubical form.

Referring now more particularly to Figure 2,

the unit designated generally by the numeral Ill,

55 comprises a hollow core ll of square cross section, said core including four outer members I2 in overlapped abutting relation and four inner members 13 of smaller transverse dimensions in the same overlapped abutting relation to each other. Each member and 13 of the core il comprises a sheet of steel or characteristic alloy the formula of which is in accordance with the size and number of wire turns of the coil wound about the core to produce the desired degree of heat within the core and surrounding shell, as will presently more fully appear. As shown more clearly in Figure 3, the sheets comprising the core members l2 and i3 as well as the members l4, comprising the outer shell, are formed by rebending the sheets composing the respective members tortuously throughout so as to produce a multiplicity of closely arranged and alternately opposed triangular passageways i5 extending throughout the length of the unit and open at their opposite ends.

Preferably, rolled supplemental sheets forming tubes (6 are placed in the respective passageways IS in circumferential contact with the three triangular walls of the passageways, one marginal portion i l of each rolled sheet being turned diametrically inward across the bore of the tube l6 and dividing the latter into two separate longitudinal passageways.

It is here noted that the peculiar folding and rebending of the sheets comprising the core and shell elements of the unit not only produces a multiplicity of passa ways through the unit with maximum surface ea, but better heat generation and conductivity is attained due to the continuity of the sheets and the avoidance of joints except at intervals where the bases of the triangular formations abut each other, the joining of the parts being effected by a welding process so as to make the structure rigid without detracting from the magnetic and heat conducting qualities of the metal.

The space between the core and outer shell of the unit is occupied by the solenoid or impedance coil l8 comprising a suitable insulated copper wire wound about the core and properly insulated therefrom, said wire being of a size and the number of turns thereof about the core being such, that with the steel or characteristic alloy comprising the core and outer shellof the requisite formula, 9. temperature of approximately 200 degrees Fahrenheit is produced in the core and shell when the coil is energized. In this connection, it is noted that the coil i8 does not extend the full length of the unit I0, but

' terminates short of each end thereof, and open ended tubular members it, of rectangular cross section, are inserted in the space between the core ii and outer shell members i i in close rela tion to each other and preferably welded in place.

By the construction of a heat transformer unit as herein described, it is obvious thatair passed through the multiplicity of passageways in the core and outer shell of the unit will become thoroughly heated due to the contact with the extensive surface area of said passageways which makes the units practically adaptable for use in heating apparatus for many purposes.

In Figure 1 of the drawings the heat transformer units of the present invention are shown as incorporated in a heating apparatus 2@, said apparatus comprising a body shell having an air intake manifold or chamber 2i and an outlet chamber or manifold 22. Between the two chambers 2i and 22 a battery of heat transformer units ID are interposed, said units being superposed one upon the other in an arrangement whereby the air from the chamber 2! has to pass therethrough into the outlet chamber or manifold 22.

Preferably, provision is made for passing the air separately through the respective heat transformers it As shown, a blower 23 is located in the lower portion of the intake chamber or manifold chamber 2i below -an air filter 26 throughwhich the air passes before entering the blower, and from the discharge outlet 25 of the blower separate conduits 26 lead into the re spective heat transformer units ML In this con-- have a plurality of conduits branched therefrom trolling device (not shown) may be provided as with other types of electrical or other heating apparatus.

The present inventive idea lies mainly within the peculiar characteristics of the heat transformer unit itself, not only as to its principle of construction and operation, but in itsready adaptability for incorporation interchangeably in heating apparatus of various sizes and capacities, and particularly as to its high efliciency I and economic advantages.

It is obvious that the folding and formation of the sheets comprising the core and outer shell of the unit admits of considerable variation and that other structural modifications may be made within the spirit and scope of the invention as 5 defined by the appended claims. The invention, therefore, is not limited to the specific construc= tion and arrangements shown in the accompanyingdrawings.

What is claimed: 1. An induction heat transformer comprising a core of magnetic sheet metal folded and reand outer shell each formed of magnetic sheet metal folded and rebent to provide a multiplicity of passageways therethrough with extensive surface exposure, and an interposed impedance coil comprising a primary winding about said core.

4. In a heat transformer unit, an open core of magnetic metal, said core being of generally square cross section and comprising separate members formed of sheets of its characteristic metal folded and rebent tortuously to provide a multiplicity of adjoining triangular open ended passageways, a multiplicity of tubular members of like characteristic metal and formation as said ;core, and an interposed impedance coil comprising a primary winding about said core.-

' 5. In a heating apparatus, a casing having an air intake chamber and an air outlet chamber, and a unitary system of induction heat transformers interposed between said chambers, each transformer unit having a core and anouter shell of magnetic sheet metal, each formed to provide a multiplicity of passageways therethrough, and an interposed impedance coil comprising a pri== mary winding about said core.

6. In a heating apparatus, a casing having an air intake chamber and an air outlet chamber, a

battery of separate but adjoining, generally rectangular, induction heat transformer units interposed between said chambers, the respective transformer units each including a rectangular core and-a correspondingly square outer shell, each having parallel pmageways therethrough, the core being built-up and including separate oblong sections formed from sheets of magnetic metal folded and rebent to form the passageways in the core and the outer shell comprising similar oblong sections formed from the same charac-' teristic sheet metal, and an interposed impedance coil between the core and outer shell of each unit, said coil comprising a primary winding I GEORGE nsLY.

about the core.

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