US1896116A - Furnace construction - Google Patents

Description

Feb. 7, 1933. J THORNTON 1,896,116

FURNACE CONSTRUCTION Filed Feb. 6, 1931 :5 6&2

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I INVENTOR. 0 071 Tfiorni'vfl BY I - ATTORNEK:

Patented Feb. 7, 1933 UNITED STATES JOHN THORNTON, or younesrowri, am

FURNACE CONSTRUCTION. 7

Application m February a, 193 isrial'm. 518,830..

This invention as indicated relates to a furnace construction, more particularly it comprises a construction es ecially adapted for use with the furnace c arging'openings of open hearth furnaces, but it is not to be limited to such use inasmuch asit is suitable for various types of industrial furnaces wherein it is desired to protect the wall and skewback, of the furnace from the destruc- 10 tive effects of heat at the point of connection of the door frame with the furnace.

It has heretofore been the practice to place Such brick has only a limited length of service before deteriorating and. frequent replacing of the same is necessary.

The present invention has for its principal object the provision of a furnace construction wherein the charging opening is provided with a frame which is suitably water cooled, said frame being formed with an extension so spaced from the wall structure of the furnace as to provide for a space which may be filled with a material very highly heat-resistant, and which will last almost. indefinitely under very severe service. Another object of the invention is to provide a supporting means, for a plastic material highly heatresistant in character, which will have a locking and positioning effect on the same and prevent its becoming displaced through vibration or shock such as occasionally is imparted to the door frame of a furnace by the charging apparatus. Other and further objects of the invention will appear in the course of the following description. To the accomplishment of the foregoing and related ends, said invention, then, consists of the means hereinafter fully described and particularly pointed out in the claims.

The annexed drawing and the following description set forth in detail certain mechanism embodying the invention, such disclosed means constltuting, however, but one of various mechanical formsin which the principle of the invention may be used.

, In said annexed drawing:

Fig. 1 is, a perspective view-showing one fojrrnoof furnace construction embodying the principles of theinvention; Fig. 2 is a similar view showing a slightly modified form of construction. I I As is clearly shown in the drawing, the furnace 1 comprises the usual side walls (not shown) and a roof structure 2, the roof struc- .7 ture being supported upon a channel skewback 3 having a flange 4 atits lower edge upon which the units forming the roof structure are supported. The furnace door frame is positioned in front of said channel skewback, being supported chiefly by. its own weight. 'The door frame as illustrated com prises two upright side frame members 5, the

upper ends 6 of which preferably extend slightly above the lower edge of the skewback. At a point spaced from saidupper ends and slightly below the loweredgeof the skewback, across member 7 of the door frame is provided, said cross member having a rearward extension 8 which is adapted to enter the furnace proper. This rearward extension is made preferably as an integral part of the door frame and is adapted to. receive the cooling-water in its course of circulation through the door frame.

The cooling water is admitted to one side member of the door frame through a pipe 11 which preferably extends to a point adjacent its lower end. A similar pipe 12 is positioned in the other side member of the door frame and'servesto receive the water circulated through the structure andcarry it to a point of discharge. The extension on the door frame, as stated, is in a rearward direction'entering within the interior of the furnace and is of such extent that it projects not only beyond the channel skewback, but

beneath the refractory materials forming the roof structure supporting thereon.

The extension on the door frame preferably is inclined upwardly, as is shown more'particularly in Fig. 2 of the drawing, and may be curved or given any desired configuration to engage throughout all, or a portion of its extent so as to provide a slight wedging action upon the packing material 13 of heatresisting quality which is engaged above the same. This packing material, preferably comprises chrome ore particles which withstand substantially twice the amount of heat as ordinary silica brick will withstand. WVhen the door frame is placed in position, the space immediately above the extension is filled with the chrome ore in plastic form which is rammed solidly into position not only beneath the lower edge of the skewback, but also beneath the forward portion of the roof structure or forward wall structure, as the case may be, as has heretofore been indicated.

Other modes of applying the principle of my invention may be employed instead of the one explained, change being made as regards the mechanism herein disclosed, provided the means stated by any of the following claims or the equivalent of such stated means be employed.

I therefore particularly point out and distinctly claim as my invention:

1. A furnace structure comprising a skewback support, an arched roof structure engaged upon said skewback, a hollow watercooled frame for a furnace door beneath said skewback, such frame comprising a pair of upright members and a connecting supporting member projecting upwardly and rearwardly in spaced relation beneath said skewback and its associated arch, said upright members being positioned outwardly of the front wall of the furnace with their upright ends overlapping'the forward face of said skewback, and a single layer of fire-resistant packing material interlockingly engaged in the space between said arch and said rearwardly and upwardly inclined supporting member and behind adjacent structural elements and adapted to be forced while plastic into said rearwardly decreasing space between said frame and said arch through wedging action when rammed thereinto from a point outside the front wall of said furnace.

2. A furnace structure comprising a skew- 7 back support, an arched roof structure engaged upon said skewbaclr, a hollow watercooled frame for a furnace door beneath said skewback, such frame comprising a pair of upright members and a connecting supporting member projecting upwardly and rearwardly in spaced relation beneath said skewback and its associated arch, said upright members being positioned outwardly of the front wall of the furnace with their upright ends overlapping the forward face of said skewback, and a single layer of fire-resistant packing material interlockingly engaged in the space between said arch and said rearwardly and upwardly inclined supporting member and behind the upright members and adapted to be forced while plastic into said JOHN THORNTON.

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