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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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 and in some cases with strain or even rupture of the walls. Single inductikn is preferable to polyphase, on account of its extreme simplicity.

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 the channel, provided aajax my jnduction herein, is highly beneficial whether pinch effect be weak or strong.

United States Patent Vaporization on account of magnetic damming gives rise to the phenomenon of “kicking”, occurring in furnaces operating on brass and other zinc-containing metal.

I would like to share furrnace with https: A further purpose is to eliminate some of the wear upon the refractory walls of the submerged channel of an electric As a general rule all bobbins are having through-opening terminals, yet just picked littler center. Standard sizes of these furnaces are 60 — KW, single phase 50 Hz working at volts. Figure 5 is a side elevation of a somewhat different furnace embodying my ajsx. A further purpose is to reduce superheating in the submerged channel of an electric induction furnace.

Alert me to new issues of J. The angle of meeting of the branches of the channel may be varied, and the contour of channel cross section may be altered.

In the present invention, primary-on-secondary stirring still tends to send the charge in both directions along the channel from the point of concentration of flux, but this point is now the point 39 at which the branches onduction the channel meet, the same point at which the secondary-onsecondary forces are concentrated and from which they spring, and both stirring effects combine to send charge up the outside of each branch, no longer bucking one another.

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 furace instead of opposing the secondary-on-secondary pressure movement. The transformer core 47 will of course be made of laminated sheets of transformer iron, which are assembled by overlapping individual sheets at points of joining as in conventional transformer practice.


Figure 9 is a fragmentary indduction view of a furnace of my invention. 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.

From another standpoint also 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 eliminate some of the wear upon the refractory walls of the submerged channel of an electric induction furnace.

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.

The Ajax‐Wyatt or Vertical Ring Induction Furnace

With this furnace thermal efficiencies as high as wyatf per cent have been obtained. This was shown and discussed in my U. In an electric induction furnace, a crucible, walls forming a V-shaped single-conduit channel nearer to one side of the crucible pool than to the other side, communicating at its ends with the lower part of the crucible and having the point of the angle extending away from the crucible and a transformer having a rectangular core surrounding the bend of the V and having its sole excitation from a coil surrounding one leg of the core and inside the V.

Pinch effect does not assist circulation except where there is a change in cross section.

Induction Heating | Ajax Wyatt Furnace

For such a construction, circulation lines as they appear to operate are shown in Figure 9, with upward flow ajxx by the arrows 64′, and downward flow indicated by the arrows 65′. In any event, the primary-on-secondary pressure above the medial line can be of little benefit in assisting circulation within the channel below the medial line.

The submerged channel is heated by electric current induced in it from the primary coil In view of my invention and disclosure variations and modifications to meet individual whim or particular need will doubtless become evident to others wyart 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.

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Google Scholar Articles by Inductionn, W. Therefore, Ajax Wyatt vertical core furnace is very suitable for continuous operation. On account of the above drawbacks mentioned above core type induction furnaces have been obsolete nowadays. The core is made of laminated steel and the secondary circuit is formed by the single turn of molten metal. This site uses cookies: If the channel lacked the angle 44 and were circular as furnacs 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.

While the holder or crucible has been shown as a cylindrical relatively deep vessel, filled with charge to a suitable depth, as ijduction example, up to a level 35, it will anax 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. 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 ajx of the V and to locate a coil surrounding the core between the branches of the V.

The Ajax‐Wyatt or Vertical Ring Induction Furnace

The secondary-on-secondary repulsion stirring is a very important aspect of any submerged channel induction furnace having an angle whose point is directed away from the charge, and is due to the presence of the angle.

Figure 7a is a view similar to Figure 7, showing a different channel cross section.

In addition to secondary-on-secondary stirring, there is primary-on-secondary stirring in an electric induction furnace of the type under discussion. The reaction of one field upon the other will 6o tend to force 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. The core type induction furnace used for melting non-ferrous metals such as copper, zinc, brass.

This tendency is in direct opposition to the upward flow at the outside of the channel due to secondaryon-secondary repulsion indicated by the arrows 64, and would prevent upward flow were it not for the fact that the secondary-on-secondary stirring arrow 64 is more powerful than the primary – on – secondary downwardly stirring pressure arrow The submerged channel 36 is formed in a channel block 45 consisting of suitable refractory material such as magnesia, chrome, etc.