US3671715A

US3671715A - Electric induction gas heater

Info

Publication number: US3671715A
Application number: US42324A
Authority: US
Inventors: Henry J Burnett
Original assignee: Individual
Current assignee: Individual
Priority date: 1970-06-01
Filing date: 1970-06-01
Publication date: 1972-06-20
Anticipated expiration: 1989-06-20

Abstract

An electric induction heater has at least one primary coil wound on a magnetic core. Fins are provided which have a pair of holes therethrough through which spaced portions of the core extend. The fins are mounted in such a manner as to be spaced from and thereby electrically insulated from the core and primary coil. The fins act as short-circuited secondaries so that heat is generated by induced current at two places in each fin when the primary coil is energized. Circuit means are provided whereby power is applied gradually to the heater so as to prevent a sudden overload of the electric supply line.

Description

United States Patent Burnett June 20, 1972 [541 ELECTRIC INDUCTION GAS HEATER 515,020 2/1894 Riker ..336/217 x [72] Inventor: Henry J. Burnett, 55 Glenwood Road, W d,

est Harm 06107 2,007,222 7/1935 Soverhill ..2l9/365 [22] Filed: June 1 1970 A 1 N 42 FOREIGN PATENTS OR APPLICATIONS 640,974 12/1936 Germany ..219/10.49 Related US. Application Data [63] Continuation-in-part of Ser. No. 554,955, June I 1, Primary Staubly 1966, Pat. No. 3,534,197. Lucla 52 us. (:1 ..219/374, 219 1049, 219/365, [571 ABSTRACT I 219/375 An electric induction heater has at least one primary coil [51] "Hush 5/08 wound on a magnetic core. Fins are provided which have a [58] Field of Search 1 9; pair of holes therethrough through which spaced portions of 219/375 3 6/217 234 the core extend. The fins are mounted in such a manner as to be spaced from and thereby electrically insulated from the [56] References cued core and primary coil. The fins act as short-circuited seconda- UNITED STATES PATENTS ries so that heat is generated by induced current at two places in each fin when the prlmary C011 15 energlzed. C1rcu1t means 2,471,972 5/1949 Nlcholson 219/365 UX are provided whereby power is applied gradually to the-heater 218993356 8/1359 Smlth 3-1 5 i so as to prevent a sudden overload of the electric supply line. 3,534,197 10/1 70 Burnett.. 1 1 2,329,693 9/1943 Black ..2l9/l0.49 2 Claims, 3 Drawing Figures ELECTRIC INDUCTION GAS HEATER This application is a continuation-in-part of my pending application Ser. No. 554,955 filed June 1, 1966, now U.S. Pat. No. 3,534,197 dated Oct. l3, 1970 and the invention set forth herein is particularly directed to the means for supporting the spaced fins of an electric induction heater in spaced relation to the primary coil thereof.

SUMMARY OF THE INVENTION The present invention provides for supporting the spaced fins of our induction type electric heater in such a manner that said fins will be firmly held in a position wherein they surround the primary coil of the heater and are spaced therefrom.

BRIEF DESCRIPTION OF THE DRAWING FIG. 1 is a sectional plan view of said heater on line 1-1 of FIG. 3.

FIG. 2 is a sectional end view on line 2-2 of FIG. 3.

FIG. 3 is a sectional side view on line 3-3 of FIG. 2.

DESCRIPTION OF THE INVENTION As illustrated in the drawings, the heater may include a casing 5 having end walls 6 and 7 and a base plate 8 which is provided with feet 9 for supporting the heater.

A magnetic core unit 10 is mounted upon said base plate and preferably comprises four sections which are joined together to form a square core. The said core sections are constructed of thin laminations and have wound thereon a primary coil 11 which is insulated from the core section.

A series of thin fiat fins 12, of non-magnetic metal are provided to complete the electrical circuit for said heater. Each of said fins has spaced holes 13-13 therethrough within which sections of the magnetic core are contained and said holes are larger than the cross-section of the primary coils 11 wound around said sections so that said fins surround said coils and are spaced therefrom as clearly shown in FIG. I of the drawings.

The core unit 10, with the coils 11 thereon, is mounted above the base plate 8 by means of brackets 14-14 which are secured to the core and have feet portions 15-15 secured to base plate.

The fins 12 are spaced from each other and from the coils 11 by means of posts 16 each of which includes a series of spacer sleeves 17 for spacing said fins apart and from the base plate 8, and a tie rod 18 which extends through said base plate and all of said fins and sleeves and firmly secures the entire fin assembly to the base plate so that the fins, which completely surround the primary coil, are spaced from said coil by means of the holes 13-13.

In the construction of the core unit as shown, groups of the laminations in each of the four sections thereof are staggered to provide a series of notches therein forming prongs 19 which project from the opposite ends of the section and intermesh with the prongs of the adjacent core section and are bound tightly together, by means of bolts 20 extending crosswise through the intermeshed prongs, to provide good magnetic contact between the difierent sections of the magnetic core.

In the type of electric heater shown, the end walls 6 and 7 of the casing are pervious and a suitable fan or blower, indicated at 21, is provided for moving air into contact with the spaced induction heated fins 12 to be heated thereby as said air is forced through the heater.

I claim:

1. In an electric induction heater, a casing having side walls and end walls and a horizontal base plate, a magnetic core having spaced elongated sections mounted vertically upon the top of said base plate and parallel to said side walls, a primary coil wound around each of said vertically mounted core sections, spaced horizontal fins surrounding said coils and each having openings therein larger than said coils to receive said coils and space the fins therefrom, said coils extending across the interior of said casing to adjacent said side walls, and vertical posts mounted upon said base plate and supporting said fins in position wherein they are spaced from San coils; each

Claims

1. In an electric induction heater, a casing having side walls and end walls and a horizontal base plate, a magnetic core having spaced elongated sections mounted vertically upon the top of said base plate and parallel to said side walls, a primary coil wound around each of said vertically mounted core sections, spaced horizontal fins surrounding said coils and each having openings therein larger than said coils to receive said coils and space the fins therefrom, said coils extending across the interior of said casing to adjacent said side walls, and vertical posts mounted upon said base plate and supporting said fins in position wherein they are spaced from said coils; each of said core sections having a series of spaced notches therein forming spaced prongs at its ends and the said prongs intermeshing with the prongs of the adjacent section, and bolts extending crosswise through said intermeshed prongs for binding them tightly together to thereby provide direct contact between said core sections.

2. An electric induction heater as set forth in claim 1 wherein each of the core sections is constructed of groups of thin laminations arranged in staggered relation to form said notches and prongs.