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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I have chosen to illustrate two only of the main forms of my invention, selecting forms chiefly for the sake of clear explanation of the principles involved and convenient exemplification of the main features of my invention.

If the channel lacked the angle 44 and were circular as viewed in the plane of the length of the channel that is, in the plane of the paper in views such as Figures 2, 2a, 6 or 8the repulsion forces would be nearly balanced, completely balanced if there were a complete circle of uniform cross section and secondary-on-secondary repulsion stirring could be ignored.

PubMed Articles by Adam, W.

Inducgion 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. The figure shows a core type induction furnace. In the drawings, like numerals refer to like parts. The currents are induced by the principle of electromagnetic induction.

While the holder or crucible has been shown as a cylindrical relatively deep vessel, filled with charge to a suitable depth, as for example, up to a level 35, it will be understood that any proper shape of crucible may be used, as best suited to the particular case, and the depth and contour of the crucible may be adjusted accordingly. 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.

Another disadvantage of this furnace is that a crucible is of inconvenient shape from the metallurgical point of view.

This fuurnace current flows through the channel and through the pool from one channel end to another. Figure 9 is a fragmentary diagrammatic view of a furnace of my invention.

The reaction of one field upon the other will 6o tend to furbace the molten metal charge within the channel to follow the outside of the channel in moving away from the points of high field intensity 66 which is intensified under theIron core.

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.

The core type induction furnace used for melting non-ferrous metals such as copper, zinc, brass. Leave this field empty. The transformer core 47 is preferably rectangular, and is of core-type as distinguished from shell-type, and comprises a side 49 passing through the coil 48, a side 50 parallel to the side 49 and located below and close to the point of meeting of the two branches of the submerged channel and sides 51 and 52 respectively parallel to one another and transverse to the sides 49 and At most it will make circulation a little easier by clearing metal out of the way along the outer wall of the channel from a point at which circulation has already begun to be easier to effect by reason of the flaring of the channel.


It is used for the same purpose as the resistance oven. Since whatever flow there may be, whether strong or weak, merges with the flow produced by my invention herein, my invention is beneficial whatever the pinch flow.

Likewise some of the downwardly flowing charge indicated by the arrow 68 Is returned upwardly as indicated by the arrow Single phase is preferable to polyphase, on account of its extreme simplicity. This site uses cookies: The charge is given from above and the molten metal is taken out through the spout. A further purpose is to start primary-on-secondary stirring in the submerged channel of an electric induction furnace at the same point at which secondary-on-secondary stirring is initiated.

A proper arrangement is made for fitting the furnace to take out molten metal.

AJAX furnace – Wikipedia

The same general variations may be made in the construction of Figures 5 to 7b as in that of Figures 1 to 4b. A further purpose is to eliminate some of the wear upon the refractory walls of the submerged channel of an electric induction furnace. In the drawings, two main types of submerged channel electric induction furnaces are shown. Figure 4 is a fragmentary section of Figure 2 on the line At first glance it would appear therefore that the circulation above the medial line from primary-on-secondary pressure would be helpful.

The reason for this is that though the primary-on-secondary repulsion produced tends to cause flow up the inside of the outer wall of the channel, with gravity return flow down the inside of the channel-as in the present inventionthe secondary-on-secondary tendency to flow is out along the inner surfaces of the inner wall of the channel passage, which are the surfaces farthest from each other at the angle.

Pinch effect is not directly affected by transformer design or position.

Electric induction furnace – AJAX ELECTRIC FURNACE CORP

Charge may be removed from the crucible, as for example by tilting the furnace inducttion trunnions 32 and 33 to pour from a spout From another standpoint inductin pinch effect dis-cussion herein can be eliminated because pinch effect is a function of “tube” or channel design and the tube can be designed to take care of the pinch effect. A further purpose is to concentrate flux at the bend of a submerged channel angle having the point of the angle directed away from an electric induction furnace pool.

My invention relates to submerged channel electric induction furnaces. I read your post. The current flowing through induciton charge is very high may be of the order of several thousand amperes. An improved form of core type induction furnace is Ajax Wyatt furnace.

AJAX furnace

In addition to secondary-on-secondary stirring, there is primary-on-secondary stirring in an electric induction furnace of the type under discussion. Further purposes ineuction in the specification and in the claims. 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 furnacd 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 the channel, provided by my invention herein, is highly beneficial whether pinch effect be weak or strong.


From Figure 8 it will be clear that the primaryon-secondary pressure of the prior art form having the shell type transformer tends to cause circulation directly counter to the secondary circulation in that part of the tube-constituting almost all of the tube-which lies below the transformer medial line and tends to cause circulation above that medial line in the same direction as the secondary-on-secondary circulation.

It is also known as eddy current heating. Aside from the theory, I find that the practical results obtained by my invention are highly desirable, in quicker and more efficient heating, better stirring and much longer life of the-refractory in the submerged channel. In an electric induction furnace, a crucible adapted to hold a molten metal charge, walls forming a single-conduit submerged channel depending from the crucible, having two branches, each communicating with the crucible at its upper end, converging one with respect to the other branch along a straight portion and meeting the other branch at its lower end in an angle whose point is directed downwardly and a transformer core passing around and linking the angle, having its sole exciting coil between the channels and part of said core outside of but close to the angle for concentrating flux at the angle in excess of that in the channel branches close to the crucible, there being but one channel per transformer.

I would like to share it with https: In an electric induction furnace, walls forming a holder for a molten metallic charge, walls forming a single-conduit submerged channel having converging branches each communicating at one end with the holder and meeting in an angle whose point is directed away from the holder at the other end, a closed magnetic circult surrounding the point of meeting ofthe branches and a transformer coil comprising the sole energizing means for the magnetic circuit.

The core is made of laminated steel and the secondary circuit is formed by the single turn of molten metal. At the time of starting, a complete ring of metal must be present the crucible otherwise, the secondary circuit will remain open and heat will not be produced. Please share it, your one share can change my life. It will be evident that the temperature differential between the pool and the channel will be maintained whatever the temperature of the pool and cannot be equalized by merely operating the furnace longer to increase the pool temperature since molten metal flowing down from the pool at the higher temperature will again be increased in temperature by reason of the unnecessarily reduced flow of metal in the channel.

United States Patent It will be understood that these are examples merely, and that considerable variation can be made in the type of contour used. Due to the secondary-on-secondary stirring, there is a 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.

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