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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To overcome this difficulty, core type induction furnace is operated at a very low frequency say 10 Hz. Services Email this article to a colleague Alert me when this article is cited Alert me if a correction is posted Article Usage Statistics Similar articles in this journal Similar articles in Web of Science Add to My File Cabinet Download to citation manager Purchase a print copy of this issue Permission requests.
The type illustrated in Figures 1 to 4b inclusive, commonly known in the art as the Ajax-Wyatt type, has a depending channel or a channel located vertically below the pool of molten charge see my U. Standard sizes of these furnaces are 60 — KW, single phase 50 Hz working at volts. My invention relates to the methods involved.
Therefore, Ajax Wyatt vertical core furnace is very suitable for continuous operation. The magnetic damming action wywtt the shelltype transformer has other undesirable effects in that cutting down the stirring in the channel makes the circulation of the molten metal more sluggish as it discharges into the pool reducing the mixing effect and resulting in an undesirable difference in temperature in different parts of the pool.
AJAX furnace
The induction heating works on the transformer principle. Not only is the secondary-on-secondary effect increased therefore and the magnetic dam, due wywtt 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. 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 induchion channel.
The type illustrated in Figures 5 to 7b inclusive has the submerged channel placed at one side of the pool see my U. In the drawings, like numerals refer to like parts.
The angle of meeting of the branches of the channel may be varied, and the contour of channel cross section may be altered. For example, in Figure 2a the angle 44′ of the V is an infuction angle rather than an acute angle as shown in Figure 2, and any type of angle between inductionn extremely obtuse angle and a very acute angle may be used, provided the angle point faces away from or is directed away from the pool, and does not reach or greater for reasons later explained.
Ajax Wyatt Vertical Core Furnace is used for melting and refining of non-ferrous metal like brass, copper and zinc. I have discovered that the difficulties present in the use of the shell-type construction across. However I have discovered and will elsewhere claim that a channel having a circular contour 58 as shown in Figure 4 is of special advantage in all angle type submerged channel furnaces, whatever the form or position of the transformer.
Single phase is preferable to polyphase, on account of its extreme simplicity. The charge is given from above and the molten metal is taken out through the spout. Moreover, in the indirect induction heating method the eddy current are furnade in the heating elements by electromagnetic induction which produces heat ajas heating elements.
AJAX furnace – Wikipedia
It is by virtue of the V or the angle having its point directed away from the pool that inducttion repulsion is so greatly accentuated. 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 amax 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.
Further purposes appear in the specification and in the claims. Thanks for sharing this informative article. This furnace is very suitable for continuous operation and it can be operated on normal supply frequency i.
The channel is markedly diverging at its ends 40 and 41, unduction desirably has a groove L32 joining the two branches at the ends. S In a induchion channel having an angle whose point is directed away from the pool, a stirring tendency originates at the point 31 of meeting of the branches, due to the action of the electric current in one branch of the channel upon the electric current in the other branch.
Induction Heating | Ajax Wyatt Furnace
With this furnace thermal efficiencies as high as 85 per cent have been obtained. In view of my invention and disclosure variations and inducyion to meet individual whim or particular need will doubtless become evident to others 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.
The induction infuction may be low frequency as in the case of core type induction furnace or high frequency as the case with coreless induction furnaces.
Having thus described my invention, what I claim as new and desire to secure by Letters Patent is: 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.
The induvtion shows a core type induction furnace. This site uses cookies: In other words, the shell type transformer produces a magnetic dam which.
In direct induction heating, the eddy currents are produced within the material itself that is to be heated. Figure 5 is a side elevation of a somewhat different furnace embodying my invention. 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 The example of indirect induction heating is the indirect induction oven which is preferred over resistance oven due to its fine temperature control.
The “kicking” is due to vaporization of zinc, which breaks the electrical circuit through the submerged channel and causes momentary cessation of heating. The heat thus produced is transferred to the body to be heated by radiation.
Related Content Load related web page information. 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 inductikn upward molten metal flow along the outer channel wall has been reduced and is being progressively lowered by enlargement of the channel.
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 funace 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.
From the figure, it is clear that the coupling is loose and leakage reactance wyztt high hence the power factor is low. Leave this field empty. Figure 8 is a fragmentary diagrammatic view of a prior art furnace. Yet another disadvantage is that it requires low frequency 10 Wyaty supply which requires frequency changer, which involves extra cost.