US1547872A - Crucible melting furnace - Google Patents

Description

July z8, i925. 1,547,872

' l C. E. HAWKE CRUCIBLE MELTING FURNACE Filed March 25 1925 l-aten'ted July 28, 1'925.

UNITED STATES" CLARENCE E. HAWKE, E METUCHEN. NEW JERSEY, AssIGNoE 'ro THE CARBORUN- DUM COMPANY, or YANIA.

, 1,547,872 vearl-:rrr "orrice.-

NIAGARA FALLS, NEW YORK, A CORPORATION 0F PENNSYL- Application filed March-2.5, 1925. Serial No. 18,154.

To all 20110771.62? may cancelar: y Be it knownlthat I, CLARENCE E. II.\wKE, a 'citizen of the United States. residing at Metuchen, in the county of Middlesex and State of New Jersey, have invented a new and useful Improvement in Crucible Melting Furnaces, of which the following is a full, Clear, and exact description. g The presentinvention relates to furnaces for melting metal, and more particularly ,to Crucible melting furnaces. 'lhe object of the invention is to provide an eliicient furnace of the latter type wherein the principle" of radiation for heating the Crucible is employed and wherein direct flame impingement on the Crucible is prevented. A preferred embodiment ofthe invention is shown in the accompanying drawings wherein. A

Figure l is a Central vertical section ofla Crucible melting furnace, the section being taken on the line I-I of Figure 2,l and Figures 2, 3. and`4 are sectional plan views of the furnace, the sections being respective'ly taken onk the lines III- III and IV-IV of Figure 1.'

The furnace shown in the illustrated lemv bodiment of thel invention comprises an outer shell 2 of steel having-a lining 3 of refractory and heat insulating material, such'as fire Clay. lVithin this outer lining is placed a system of horizontal circular flues 4, 5 and 6 the walls of which are constructfed of lhighly refractory material capable of radiating heat freely. I prefer to use for v .this purpose silicon carbide refractory material.' The tlues are separated from each other by horizontal partitions 7 and'S.' A port 9 extends through the wall of the furnace for the admission of the burning' gases into the upper flue 4, a burner 10 being arv plate as this material is highly refractory lranged opposite this port. It will be seen that the partition 7 vconstitutes a plate uponl which the burning gases impinge upon entering the flue 4. Silicon carbide is particuand has high mechanical strength.

A vertical partition 11 in the flue 4 adjacent the admission port 9 compels the burning gases to travel in one direction through said flue, as indicated by the arrows in Figure 2, until they reach a port 12 in the partition 7 adjacent the partition 11. This port departing admits the gases to the line 5, through which they travel in opposite directions, as indicated by the arrows in Figure 3, until they reach a po1t`13 in the'partition 8. 'The port '13 admits the gases to fthe flue 6 through which theytravel in opposite directions, as indicated by the arrows in Figure 4. The gases pass from the fluev 6 through ports 14 into the inner chamber 15 0f the furnace, in which is located the cru- Cible or melting pot 16.

The gases, by the time they reach the inner Chamber 15 of the furnace, have been Completely burned and thus flame impingement on the Crucible itself is prevented. These hot gases, however, passup through vthe space between the Crucible and thefradiating surface of the combustion flue Construction and are discharged at the top lthrough suitable openings around the top of the Crucible, vone of said openines being shown in Figure 1 .and designated by the reference numeral 17.

The furnace is provided with trunnions 18 whereby it is adapted to be mounted to tilt for the discharge of the metal melted within the Crucible so that the pot or Cru- Cible is not taken from the furnace, said pot or Crucible being firmly built into place within the heating Chamber of the furnace.

It will be seen that I have provided a. Crucible melting furnace wherein the Crucible is heated both by radiation and by direct .Contactl of the. hot gases therewith.

completely burned before they come into Contact with the Crucible. Flame imp'ingement on the Crucible is thus prevented whereby the Alife of the Crucible is increased an appreciable amount. This method of heating also effects a better utilization of lthe heat of the fuel employed and a more uniform heat-ing of the Crucible.

lVhile I have shown and described a pre- AThe flue construction compels the burning ferred embodiment of my invention, it will be understood that the invention is not limited to' its illustrated embodiment but that it may be otherwise embodied wi-thin the scope of the appended Claims without from the spirit lof the invention. I claim:

1.*A crucible melting refractory lining, a flue system within said llining, certain of the walls of which are formed of refractory material adapted tol radiate heat freely and which constitute the side Walls of a chamber for receiving `the Crucible, and a Crucible within said chamber, said flue system communicating with said chamber adjacent its`lower endV and having 'an admission port for burning gases adjacent the upper end of said chamber, substantially as described. i

2. A cruciblemelting furnace having a refractory lining, a flue system withinfsaid lining, certain of the walls of whichv are formed of refractory material adapted to -V`radiateheatg freely and which constitute the "side walls vof a chamber for` receiving the Crucibleand'a Crucible within said chamber, said flue system communicating with said chamber adjacent its lower end and having an admission port for burning "gases adjacent the flue system comprising a plurality of intercommunicating flues each extending substantially completely around said chamber, whereby the gases are compelled to travel a plurality of times about said chamber before being admitted thereto, substantially' as' described.

3. A Crucible melting furnace' having a refractory lining, a flue system within said lining, certain of the Walls of lwhich are formedof refractory material adapted to radiate heat freely and which constitute the side walls of a chamber for receivin the Crucible, and a Crucible held within said chamber, said flue system communi ting with said chamber adjacentdits low end v,and having an admission port for burning gases adjacent the upper end of. said chamber, said furnace having means whereby it is adapted to be mounted "to tilt for the discharge of the Ametal melted within the Crucible, substantially as described. c

4.1A Crucible melting furnace having a refractory lining, a l I said lining, Certain of,` the vWalls of furnace having a upper end of said chamber, saidy Y substantially as described.

flue system within which constitute side wallsI of a chamber for .receiving the Crucible, and a Crucible within said Chamber, said iue system communicating with saidl chamber adjacent 'its lower end and having an admission port for burn ing gases adjacent the upper end of said chamber, substantially as described.l

5. A Crucible melting furnace havingl a refractory lining,.a silicon carbide flue system Within said lining, Certain of the walls I of which constitute ysidewalls ofa Chamber for receiving., the Crucible, and a Crucible within said chamber, said iue system Comprising a plurality of superposed intercommunicating horizontal tlues each extending substantially Completely around said chamber, the upper iue havingv an admission port for lburning gases and the lower Hue communicating with Said chamberzat the lower end thereof, whereby the7 gases are Compelled to travel a plurality of times about said chamberbefore being admitted thereto,

y 6. A Crucible melting furnace, a cylindrical outer-metal shell havingtrunnions whereby the furnace is ladapted to be mounted to comprising` tilt for the discharge of the metalqmelted within` the Crucible, a refractory lining within .said shell, a silicon carbide flue system within said lining, certain of the Walls of which constitute the side walls of a chamber for receiving the Crucible,-

and a Crucible fixed within said chamber, said flue system comprising a plurality of superposed intercommunicating horizontal circular flues each extending substantially completely around said Chamber, the upper iiue having an admission port for burning gases and the lower flue communicating with l v said chamber at the lower end thereof,

whereby the gases are compelled to travel a plurality of times about*said chamber 'bei fore being admitted. thereto, substantially as described. r f

In testimony whereofI have hereunto set my hand.`lv i CLARENCE HAVVKE

Images