In this article we will discuss about the design of core and coreless induction furnace. An improved form of core type furnace is Ajax-Wyatt vertical core type . ea1 ring induction type. CONSTRUCTION. OF FURNACE. The vertical-ring ioduction furnace makes use of the pat- sented Ajax-Wyatt heating element. VERTICAL CORE TYPE INDUCTION FURNACE Also known as AJAX-WYATT FURNACE. Vertical crucible is used for the charge. Bottom is usually V-shaped or .

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In a submerged channel electric induction furnace having a V-shaped channel with the point of the V directed from the pool of the furnace, a further purpose is to place the core of a coretype transformer around the bend of the V and to locate a coil surrounding the core between the branches of the V. When the vaporized zinc has passed out of the channel, molten metal flows in to fill the space which it occupied, producing a noise known as a “bump” and causing coincident shock and stress to the channel walls, with corresponding weakening of the walls inductikn in some cases with strain or even rupture of the walls.

Both of the ends 40 and 41 of the submerged channel communicate with the pool, so that molten charge from the pool may freely enter the channel, and likewise molten charge from the channel may readily mingle with the pool.

In other words, whatever assistance primary-onsecondary pressure above the medial transformer line offers in clearing metal out ahead of the secondary-on-secondary flow is not effective until a point in the channel is reached at which the fluid resistance to upward molten metal flow along the outer channel wall has been reduced and is being progressively lowered by enlargement of the channel.

The angle 44 of the V, which is the angle between the adjacent straight portions of the branches of the channel, may vary from the angle shown in Figure 2.

Induction Heating | Ajax Wyatt Furnace

Yet another disadvantage is that it requires low frequency 10 Hz supply which requires frequency changer, which involves extra cost. Pinch effect flow, due to the tendency of current in different parts of the same molten conductor to constrict the conductor and to cause ‘5 molten metal to flow upwardly along the middle of the channel has been considered in the above discussion, but has not been discussed before nor further than is herein explained for the reason that the elimination of counter-pressures along the outer walls of indution channel, provided by my invention herein, is highly beneficial whether pinch effect be weak or strong.


As a rough analogy, pinch effect flow may be compared to the type of flow produced in a flexible hose when the 30 walls are uniformly constricted from the outside. Not only is the secondary-on-secondary effect increased therefore and the magnetic dam, due to primary-on-secondary effect in the Figure 8 form, eliminated, but the primary-on-secondary pressure which previously constituted the dam is applied to assist instead of opposing the secondary-on-secondary pressure movement.

In an electric induction furnace, walls forming a crucible for a charge, walls forming a Vshaped single-conduit channel filled with molten charge when the furnace is in operation, communicating with the crucible and having the point of the V directed away from the crucible, a closed magnetic circuit individual to the channel surrounding the point of the V and passing through the spacing between the channel walls and a primary winding upon the portion of the closed magnetic circuit between the channel walls, the transformer being free from winding in proximity to the V.

The essential features of Figures 5 to 7b, inclusive, are, however, the same as those of Figures 1 to 4b, inclusive. Figure 3 is a fragmentary section of Figure 2 on the line By explaining the theory upon which my invention is believed to operate, I do not wish to limit myself to this theory nor to make the correctness of the theory essential to the protection afforded my invention.

AJAX furnace – Wikipedia

Due to the secondary-on-secondary stirring, there is idnuction tendency to cause molten metal to flow upwardly from the point 39 along the outside of the channel in each branch toward the pool as indicated by the arrows 64, and to permit molten metal to flow by gravity down the inside of the channel from the pool as indicated by the arrows 66, to replace the upwardly flowing molten metal.

In the prior art, where the shell-type transformer was used, the leakage field in inductuon channel was most concentrated at some points 66 between the legs of the transformer core. The specifications for an ideal electric melting furnace are laid down, and operating data are presented to show that the vertical ring induction furnace more nearly meets these specifications than any other type of furnace.


The attempt to use the core-type transformer about re-entrant angles inductoin above has not produced the advantage nor the flow relations of my u5 invention. The melt is completed in about 1 to 2 hours for large sizes and in lesser time for smaller sizes. In view of my invention and disclosure variations and modifications to meet individual whim or particular need will doubtless become evident to firnace skilled in the art, to obtain all or part of the benefits of my invention without copying the structure shown, and I, therefore, claim all such in so far as they fall within the reasonable spirit and scope of my invention.

This site uses cookies: An improved wjatt of core type induction furnace is Ajax Wyatt furnace.

The power factor of the circuit is about 0. It will be evident that the re-entrant angle form concentrates the flux from the core-type of transformer disadvantageously at the angle instead of advantageously and loses all of the advantages of my invention. My invention relates to submerged channel electric induction furnaces.

The core is made of laminated steel and the secondary circuit is formed by the single turn of molten metal. Figure 7b is a view corresponding to Figure 7, inductiom illustrating another variation in channel cross section.

The charge is heated by a submerged channel 36 having branches 37 and 38 meeting at 39 in an angle whose point is directed away from the pool Google Scholar Articles by Adam, W. I have discovered that the difficulties present in the use of the shell-type furnsce across. This induced current flows through the channel and through the pool from one channel end to another.

The Ajax‐Wyatt or Vertical Ring Induction Furnace

The use of core-type transformers about the points of angles in submerged channels has been attempted in which the point of the angle of the channel is directed toward the pool. Figure 4 is a fragmentary section of Figure 2 on the line The figure shows a core type induction furnace.

The stirring action is due to the combined motor, eyatt and joule effects. This furnace is very suitable for continuous operation and it can be operated on normal supply frequency i.