US2359272A - Induction heating head - Google Patents

Description

H. E. SOMES INDUCTION HEATING HEAD seepf. 26, 1944.

Original Filed Oct. 18,- 1941 NVENTOR Howard E. Sox/nes ATTORNEY Patented Sept. 26, 1944 OFFICE INDUCTION HATING HEAD Howard E. Somes, Detroit, Mich., assigner to Budd Induction Heating, Inc., Philadelphia, Pa.. a corporation of Michigan original application october, 1s, 1941, serial No.- 415,580. Divided and this application June 11,

\ 1942, serial No. 446,568

(Cl. 21S- 13) 9 Claims.

'I'his application is a division of my application E Serial N0. 415,580, led October 18, 1941.

This invention relates to apparatus for heat treating metal eproducts and particularly to an induction heating .head for use in such treatment.

An object is to provide an induction heating head especially constructed and arranged for horizontal operation in heating the inner sur- 'faces of hollow workpieces, although it will be apparent that the' invention includes features adapted to either vertical or horizontal work.

A further object is to provide an induction heating head constructed and arranged to per-l mit the heating coil being quickly removed from a supporting arbor and replaced by a coil of different size.

A further object is to provide an induction heating head `constructed and arranged to convey coolant to and from the heating coil without discharging any`of the coolant fluid outside of the head.

These and other objects which will be apparent are attained by the present invention which is Villustrated in the accompanying drawing, in which Figure 1 is a longitudinal sectional view` upon the end of the mandrel. lThermal insulating means is provided between the separate passages to prevent the temperature of the coolant owing to the coil being raised'by the heated iiuid which has passed through the heating coil and is being conveyed away therefrom.

The illustrated embodiment shows an inducing conductor l0 having a number of convolutions and provided with an inner passage Il tor cooling. Water or other appropriate coolant is supplied through the passage I 2 in the hollow arbor, thence through passages I3 and I4 to a radial passage I3, through the several turns of the inducing conductor and thence through a radial hollow connector plug Il. From the plug Il the coolant. ilowsv through a slot I3, radial 55 the end of the tube 31.

bore I6' and chamber Il formed in an end plug I 8, and back through inner heat insulated passages |3 and 20.' The passage for conveying the coolant away from the heating coil is thermally insulated. Radial lamlnations 2| enclose the inducing conductor as is well known in the art, and these laminations are mounted on an annular coil support 22 having an annular extension 23 engaging electrical contacts formed by circumferentially spaced, yieldable` ngers 24 contacting an outer surface 25 of reduced diameter on the inner end of such extension 23 and connected to an inner annular arbor portion 23. r'l'he other end of the conductor coil is electrically connected through the insulated, hollow connector 21 with an insulated arbor member 28.

In order to permit ready replacement of one head with another of different diameter, to accommodate diierent sizes of workfpieces, the present invention provides a construction per mitting such change upon removing two threaded connections. The coil support 22 is secured in place by. an 'elongated hollow bolt 29 having a head 30 engaging in and closing the end of a hollow sleeve 3l, and an inner end threaded to the reduced bore of an annular arbor member 32 which is in turn threaded to the insulated arbor portion 28. The inner end of the sleeve 3l slidably engages the bore of the arbor member 32. The greater portion of the elongated bolt 29 is of somewhat reduced diameter to provide for the coolant conveying passage I4. The

coolant conveying passage I9 formed within the a substantial distance therethrough. The insu-v lating member has a head 35 bearing against outer end of .the bolt and expanded over y e head of a retaining ring 36 keyed to the inner annular end of the chambered plug I8 which is rotatable relatively to the ring so that rotation of the plug will' haveno twisting effect upon the head 35 of the insulating member 34. The central coolant passageway 20 is formed by a hollow member 3l connected to the annular arbor member 32 by a hollow connector 38 threaded into the arbor member and frictionally receiving The greater 'length of the tube 3l is enclosed within a thermal insulating sleeve 3,3 to prevent transfer of heat between the outgoing and incoming coolant.

The hollow passage forming sleeve 3| has a shouldered end tting within 'a similarly formed end of a sleeve 4| of electrically insulating ma.

i'ferial interposed between the sleeve 3l and the extension Z3 of the coil support. Similarly, the arbormembers 2d and 32 are electrically insulated vfrom. the surrounding arbor members by an insulating sleeve 42 forming an extension of the sleeve All.

The annular arbor portion it is surrounded by an outer arbor portion Q3 of greater diameter which forms therewith a passage dil for quenching huid. The passage lf3 is continued by an outer sleeve lo threaded to the arbor portion dii and secured in position by a partially split loch nut 36 having a locking bolt il for drawing the two parts of the nut together. An annular nozzie member it isthreaded in the end oi the inner arbor portion @t and formed so as to cooperate with the adjacent end of the outer sleeve to provide a quench nozzle at such an angle that the quenching iiuid is directed outwardly at an angle away from the adjacent heating coil.

rlhe construction is such that the heating head is easily replaceable upon removing two threaded connections. when the plug lil is unserer/ed, the annular ring 3G whichl is keyed thereto to-J gether with the hollow thermal insulating meinber @il can be pulled out of the head. with the plug. The hollow bolt Zi@ can then be unscrewed and removed permitting removal of the hollow sleeve Si; This permits removal of the heating head comprising the coil supporting member and coil iii, the insulation (il being removed therewith.

The quench head is also readily removable for replacement by a head of different diameter. To do so, the nozzle member lil is unthreaded whereupon the sleeve t5 can be unthreaded after first releasing the loci; nut d6. A new sleeve H35 oi different diameter and a nozzle member lil of diiierent radial depth can then be substituted to accomodate a workpiece 5i of diierent diameter. At the same time a heating head oi the desired diameter can be placed in position and the holding members consisting oi the hollow bolt 3, plug ld and associated parts can then be replaced and secured in position.

in order to accurately position and support the end of the outer arbor portion 33, a plurality of circumferentielly spaced supporting blocks are keyed in the outer face of the inner arbor portion 26 and engage the inner face of the outer portion-43. Inasmuch as these spacers are located in the quenching liquid' passage, they are formed of streamline contour in order to avoid producing turbulence in the uid. This huid may be either liquid or gas as described in my above mentioned application.

It will be apparent that incoming coolant iiown ing through the passages I2, I3, lll, etc.,is protected against the heating effect of the outgoing coolant iiow'ing through the hollow bolt. 29 and passage by the thermal insulating members above described. There is no discharge of coolant outside the heating head and none is brought into contact with the surrounding workpiece.

Although I have described one embodiment only of. the invention in specic detail, it will be apparent that the invention is not limited thereto but can be variously modified and adapted within the scope of the appended claims.

What is claimed is: f

1. The'combination in an induction head for heat treating, of a supporting and current conducting arbor, a, tubular induction heating coil, a 'coll support including a current conducting exmeans forming a coolant conveying passage betension, meansfor electrically connecting said extension to said arbor including circumferentially spaced contacts mounted on said arbor and slidably engaging said extension, a hollow clamping bolt extending through said support and extension and engageable4 with said arbor for clamping said coil and support thereto, and

tween said tubular coil and said hollow bolt.

2. The combination in an induction head for heat treating, of a supporting and current conducting arbor, a tubular induction heating coil, a coil support including a current conducting extension, means for electrically connecting said extension to said arbor including circumferentially spaced contacts mounted on said arbor and slidably engaging said extension, a hollow clamp-l ing bolt extending through said support and extension and engageable with said arbor for clamping said coil support thereto, means forming a coolant conveying passage between said tubular coil and said hollow bolt, and a tube oi thermai insulating material extending through said bolt to form a non-conducting wall around the coolant passage therein.

3. The combination in an induction vhead ior heat treating, of a supporting hollow `arb-or, a tubular induction heating coil, an annular coil support, a hollow clamping bolt extending through said support and engaging said arbor tor securing said coil support to said arbor and forming with said arbor a coolant-return passage, means providing a coolant supply passage surrounding said bolt and arbor, means connecting said supply passage to one end of said coil, a sleeve of thermal insulating material extending through said bolt to form a non-conducting wall around said return passagaand a' chambered member closing said annular coil support and connecting the other end of said tubular coil to said hollow bolt, and means for connecting said insulating material to said chambered member for removal therewith.

1i. The combination in an induction head for heat treating of a. supporting hollow arbor, e. tubular induction heating coil, an annular coil support, a hollow clamping bolt extending through said coil support and engaging said arbor for securing said coil support to said arbor and forming with said arbor a coolant return passage, means providing a coolant supply passage surrounding said bolt and arbor, means connecting said supply passage to one end of said coil, a sleeve f 'thermal insulating material kextending through said bolt to form a non-conducting wall around Said return passage, a chambered member closing said annular coil support threaded to said coil support and forming a passage be- 'tween the other end of said tubular coil and said hollowbolt, and means connecting said insulating material to said closure whereby removal of said closure withdraws said insulating material from said bolt.

5. In an induction heating head, an annular coil support, a current conducting coil carried by said support and having a coolant conducting passage therethrough, said support having axially spaced passages extending through the wall thereof and connected with said coil passage for conducting coolant thereto and therefrom, and circumferentially spaced concentric tubular memberswithin said support, said members at one end being connected together influid-tight engagement, one of said axially spaced passages being in communication with the space between the borethereof and having a passageway through the wall thereof in communication with the interior of the innermost of said tubular members, and a current conductor surrounding said support, said conductor having a coolant conducting passageway therethrough in communication at one end through the wall of said support with the space between said members and in communication at its other end through the wall of said support with said closure member passageway.V

7. In an induction heating head, annular coi-l support, concentric circumferentially spaced tubular members within, said support engaged together at one end within said support in viluidtight relation to constitute an outer closed-end passage, 4a sleeve of thermal insulating material within the innermost of said members, said sleeve constituting an inner open-end passage thermally insulated from said outer passage, a'closure l ember within said annular support'closingthe bore thereof and having a passageway throughthe wall thereof in communication with the interior of said sleeve, and acurrent conductor surrounding said support, said conductor having a coolant conducting passageway therethrough in communication at one end through the wall of said support and the innermost of said members with said outer passage and'at the other end through said support wall with said closure member passage.

-8. In an induction heating head, an annular support having a bore, a current conductor surrounding said support, means within said supportde'ningcconcentric outer and innerv passages, said inner passage opening at one end into the bore of said support, a sleeve of heat insulating material. within said inner passage, a removable closure member` for the bore of said l. support, and lmeans connecting said sleeve and closure member for removal of said sleeve with said closure member, saidconductor having a coolant passageway in communication at one end with said outer passage and at its other end through said closure member with the interior of said sleeve.

9. The combination in an induction heating apparatus, of an annular support, a current conductor surrounding said support and having a coolant conducting passage therethrough, concentric tubular members circumferentially spaced from each other, said members being connected together at one end within said support in fluidtight engagement, said passage being in communication with the space between said members and with the interior of the innermost of 'said members, a tubular arbor, and a conduit Within and spaced from the internal wall of said arbor,

lspace betweensaid members being in coolant condiicting communication `with the space betweenthe inner wall of vsaid arbor and said conduit.

HOWARD E. SOMES.

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