US3077866A - Water-cooled furnace door frame - Google Patents

Description

Feb. 19, 1963 J. H. REIGHART WATER-COOLED FURNACE DQOR FRAME Filed March 7, 1960 INVENTOR. 2a JwneliReigkwrfi ATTORNEYS 3,077,866 WATER-EIGQLED FURNAQE DGUR FRAME June lid. Reignart, W91 Lee Road, (Zieveland, Ghio Filed Mar. 7, 1969, Ser. No. 13,056 4 Claims. (til. 122-498) The invention relates to furnace door frames, and more particularly to water-cooled door frames especially adapted for use with water-cooled doors of open hearth furnaces, melting furnaces and the like.

Hollow, water-cooled door frames are commonly used for such furnaces, such door frames comprising generally a hollow steel shell forming an arch with depending hollow legs or jambs communicating therewith, and means for passing cooling water therethrough.

in steel mills generally, river water is circulated through the hollow shell and jambs of such door frames for cooling the same to protect them against the intense furnace heat to which they are subjected. As river water ordinarily contains sand, silt, earth and the like, much of which is so fine that it passes through the filters usually provided for such purpose, considerable difficulty is experienced by admitting the same to the interiors of such hollow door frames.

A major difficulty experienced in steel mill practice is that this fine sand, silt, earth and similar impurities is deposited in a film or layer upon the arch of the door frame, which is subjected to the full intensity of the furnace heat.

This results in this film or layer of earthy substances becoming vitrified by the heat of the furnace, and by continued use additional films of these substances will build up upon the arch of the door frame and become vitrified, forming an insulation layer of such thickness that the water circulating through the hollow shell can no longer adequately cool the arch of the door frame.

As a result, the arch plate of the door frame is subjected to the full intensity of the furnace heat without the benefit of adequate cooling, and quickly burns out, rendering the door frame useless and requiring immediate replacement thereof.

Also, such door frames are sometimes provided with inwardly disposed, hollow jamb guards on the legs or jarn'os of the door frame, between which jamb guards the brick-work of the furnace wall is built.

Another difliculty commonly experienced in the use of such water-cooled furnace door frames is the formation of steam pockets which interfere with the flow of water.

It is therefore a primary object of the invention to provide a hollow, water-cooled door frame having means therein for preventing earthy impurities in the circulating water from being deposited upon the arch plate of the door frame and insulating the same against the cooling influence of the water.

Another object of the invention is to provide a door frame of the character referred to having sumps in the lower ends of the hollow legs or jambs thereof and means for delivering the cooling water directly to these sumps so that the greater portion of the earthy impurities in the water may be deposited therein, after which the wafor with these impurities removed therefrom is circulated through the hollow shell.

A further object of the invention is to provide such a door frame in which each sump i formed by an angularly inclined partition wall within and spaced from the lower end of each leg or jamb of the frame, the water inlet pipe being located through said partition wall for delivering the incoming water directly into the sump, the water then rising through an opening at the top of the inclined partition wall and circulating through the hollow door frame to the discharge outlet.

Another object of the invention is to provide a furnace door frame of this type having inwardly disposed hollow jamb guards on the legs or jambs thereof and means for circulating cooling water through these jamb guards so as to adequately cool the same to protect them against the heat of the furnace.

A further object of the invention is to provide a watercooled door frame of this type having a separate circulation system in each jamb guard to prevent accumulation of steam in pockets which would interfere with the how of water.

Another object of the invention is to provide a watercooled door frame of this type in which spaced baffle walls are provided within the hollow jamb guards so as to direct the flow of cooling water against the innermost portions of the jamb guards.

These and other objects, apparent from the drawings and following description, may be attained, the above-described difiiculties overcome and the advantages and results obtained, by the apparatus, construction, arrangement and combinations, sub-combinations and parts which comprise the present invention, preferred embodiments of which, illustrative of the best modes in which applicant has contemplated applying the principle, being set forth in detail in the following description and illustrated in the accompanying drawings.

In general terms, the invention may be briefly described in its simplest form as comprising a hollow water-cooled furnace door frame comprising a steel shell having depending legs or jambs, an arch plate in the shell forming the bottom of the main body of the door frame and the opposed side walls of the legs or jambs.

An angularly inclined partition wall is located within the lower portion of each leg or jamb at a point spaced from the bottom thereof providing a sump in the lower end of each hollow leg or jamb. A water inlet pipe enters the hollow shell at one upper corner thereof and communicates with a manifold centrally located therein. Pipes lead from each end of said manifold down into the hollow legs or jambs, each pipe passing through the corresponding inclined partition wall and terminating therebelow.

Thus, the incoming water is delivered directly to the sumps in the lower ends of the legs or jambs and earthy impurities in the water may be deposited by gravity therein. The water then passes upward through an opening at the top of each inclined partition wall through the hollow legs or jambs and then through the main body portion of the shell and is discharged through an outlet pipe in the other upper corner of the shell.

A small vent is preferably provided in the lower por-' tion of each inclined partition wall to permit a small amount of water to rise upwardly therethrough, in order to agitate the water in the hollow legs or jambs directly above the inclined partition wall to prevent the deposit of earth impurities from the water onto the top thereof and to permit such impurities to settle by gravity through said vent into the sump. A clean-out plug is provided in the lower portion of each sump for the purpose of periodically removing any accumulation of sand, silt, earth and the like therefrom.

In the embodiment of the invention in which a hollow jamb guard is disposed inwardly from each leg or jamb of the hollow door frame, the above-described means for circulating water therein is provided. However, each hollow jamb guard communicates with the corresponding leg or jamb of the frame only at the lower and upper ends of the jamb guard.

The lower end of the jamb guard communicates with the corresponding leg or jarnb directly below the upper end of the inclined partition wall. Spaced, inclined bafiie walls are located within each hollow jamb guard in order to direct the flow of water against the innermost portion of the jamb guard.

In addition to the water-circulating means above described, a second pair of pipes leads from the manifold downward to each hollow leg or jamb terminating above the inclined partition wall therein. If desired, a second sump may be formed in each leg or jamb by locating a second inclined partition wall therein at a point above the first partition wall, the second pipe in each leg extending through this second partition wall and terminating therebelow, and the water rising up from the second sump through an opening at the upper end of the second partition wall and circulating upward through the hollow legs or jambs and then through the main body portion of the hollow door frame to the outlet.

Various other arrangements of pipes and baflie walls' maybe provided where the hollow door frame is provided with both a hollow lintel and hollow jamb guards for providing adequate circulation through each, and the lintel and jamb guards may communicate with each other so that the water passes directly from the jamb guards FIG. 3 is a perspective view of the door frame shown in FIGS. 1 and 2, on a smaller scale, looking toward the inner or furnace side thereof;

FIG. 4 is a fragmentary transverse, sectional view taken on line 4-4, FIG. 2.

In the embodiment of the invention illustrated in FIGS. 1-4 inclusive, water-cooled jamb guards are provided on the inner or furnace side of the legs or jambs of the door frame. The steel shell comprises the upper body portion 1 and the depending hollow legs or jambs 2, the shell, having the spaced inner and outer steel plates 3 and 4 respectively, forming the inner and outer walls of the body portion and the legs or jambs, the top plate 5, the end plates 6, forming the end walls of the body of the frame and of the legs or jambs, the arch plate 7, forming the bottom of the body portion and the other side wall of each leg or jamb, and the bottom plates 8 forming closure walls' for the lower ends of the legs or jambs.

Spacing bolts or bars 9 may be provided for connecting the plates 3 and 4 in spaced relation and conventional door guideways It} may be located on the back or outer side of the frame, all as above described.

In this embodiment of the invention, hollow jamb guards 24 are located on the inner or furnace side of the hollow frame, and means is provided for producing a separate system for circulating cooling water therethrough, to prevent accumulation of steam in pockets. Water is admitted to the interior of the hollow frame through the inlet pipe 11:: at one upper corner of the frame for connection to a hose or the like leading from a suitable supply of cold water.

The inlet pipe 11a extends through the top plate and is then directed toward the center of the hollow shell where it is connected to the manifold 12a. Pipes 13a are connected to opposite ends of the manifold 12a and are directed toward opposite ends of the shell and then downwardly as at 14a into the legs or jambs 2.

An inclined partition wall 15a is rigidly mounted in the lower portion of each leg or jamb 2, at a point spaced above the bottom wall 8 thereof, each partition wall being inclined upwardly from the outer wall 4 to the inner wall 3 to which it is connected just above the inlet opening 25 to the lower end of the corresponding hollow jamb guard 24.

A vent 18a is preferably provided in the lower end of each partition wall 15a. The straight portion 14a of each pipe 13:: is located through a suitable opening 16a in the corresponding partition wall 15a and terminates directly therebelow.

Spaced upwardly and inwardly inclined bai'lle plates 26 are connected to the inner wall 3, within each jamb guard 24, and terminate at points spaced from the vertical inner wall 27 of the jamb guard. The lower wall 28 of each jamb guard is inclined upwardly and inwardly, and the upper wall 29 thereof is inclined downwardly and inwardly toward the vertical wall 27.

An outlet opening 30, preferably of smaller size than the inlet opening 25, is provided in the inner wall 3 of the shell at the upper end of each jamb guard 24, thus permitting water entering the lower end of the jamb guard through the inlet opening 25 to pass out of the upper end of the jamb guard and enter the interior of the hollow shell.

A pair of pipes 31 are connected to the manifold 12a and are disposed in opposite directions toward opposite ends of the shell and are then directed downwardly as at 32 into the legs or jambs 2, passing through the upwardly and inwardly inclined partition wall 33, located in the legs or jambs 2 at points spaced above the inclined partition walls 15a and thus providing a second sump in the lower portion of each hollow leg or jamb.

An opening 34 is formed in the upper end of each partition wall 33 toward the arch plate 7, and a vent 35 is preferably provided in the lower end of each partition wall 33. A clean-out plug 200 is located in the lower end of each hollow leg or jamb to clean accumulated dirt from the lower sump 21a therein, a clean-out plug 22:: is located in the lower end of the upper sump 36 in each leg, and a clean-out plug 37 may be located in each leg above the lower end of the inclined partition wall 33 to remove any accumulation of dirt around the vent 35.

The incoming cold fluid from the inlet pipe 11a is distributed through the manifold 12a to the pipes 13a and '31. The water passing into the pipes 13a, and downwardly through the vertical portions 14:: thereof, is delivered directly to the lower sumps 21a in the lower ends of the hollow legs or jambs, a considerable portion of the earthy impurities in the water being deposited by gravity in the sumps 21a.

This water then passes through the inlet openings 25 into the lower ends of the hollow jamb guards 24, rising therein and being directed around the ends of the inclined baflie walls 26 against the vertical inner Wall 27 of each jamb guard and then passing through the outlet openings 30 into the interior of the hollow shell.

The water from the pipes 31 is delivered directly to the sumps 36, where earth impurities are deposited by gravity and the water rises through the openings 34 in the inclined partition walls 33, upward through the hollow legs or jambs 2 and through the hollow body portion 1 of the shell, and with the water from the hollow jambs is carried upwardly and outwardly through the outlet pipe 19a.

With this a rrangementit will be seen that the hollow jamb guards 24 and the hollow legs 2 of the frame are each cooled by water passing directly thereto from the inlet pipe. The provision of separate circulation systems for the hollow jamb guards prevents the accumulation of steam in pockets which would interfere with the free flow of Water therethrough.

Sumps are provided for each of the pipes leading to the legs of the hollow frame, a considerable portion of the earthy impurities is removed from the water so that as the water is circulated upwardly in the hollow shell and over the arch plate 7 the chances of forming a film of earthy impurities upon the arch plate is greatl minimized.

In the foregoing description, certain terms have been used for brevity, clearness and understanding, but no unnecessary limitations are to be implied therefrom beyond the requirements of the prior art, because such words are used for descriptive purposes therein and are intended to be broadly construed.

Moreover, the embodiments of the improved construction illustrated and described herein are by way of example, and the scope of the present invention is not limited to the exact details of construction.

Having now described the invention or discovery, the construction, the operation, and use of preferred embodiments thereof, and the advantageous new and useful results obtained thereby; the new and useful construction, and reasonable mechanical equivalents thereof obvious to those skilled in the art, are set forth in the appended claims.

I claim:

1. In a hollow, water-cooled furnace door frame of the character described, spaced inner and outer plates having depending extensions at opposite side edges defining in part a hollow shell consisting of a hollow body portion and spaced hollow legs depending therefrom, a top plate closing the top of said hollow body portion, an arch plate closing the bottom of said hollow body portion and the inner sides of the hollow legs, end plates closing the edges of the hollow body and the outer sides of the hollow legs, bottom plates closing the lower ends of the hollow legs, a partition wall within each hollow leg and spaced from the bottom thereof providing a sump in the lower end of each leg, means for circulating a fluid through said shell, said means comprising a fluid inlet pipe extending from an upper corner of the hollow shell to a point adjacent the center of the hollow body portion, conduits extending down into said hollow legs and through the partition walls therein, means providing communication between said inlet pipe and said conduits, hollow vertical water-cooled jamb guards fixed upon the exterior of said inner plate and substantially coextensive with said hollow legs, means providing communication between each sump and the lower end of the corresponding jamb guard, means providing communication between the upper end of each jamb guard and the hollow shell, a second partition wall in each hollow leg spaced above the first named partition Wall and providing a second sump in each hollow leg, there being an opening in each second named partition forming communication between each second named sump and the corresponding hollow leg, second conduits extending down into said second sumps, means providing communication between said inlet pipe and said second conduits, and a fluid outlet at the other upper corner of the hollow shell.

2. In a hollow, water-cooled furnace door frame of the character described, spaced inner and outer plates having depending extensions at opposite side edges defining in part a hollow shell consisting of a hollow body portion and spaced hollow legs depending therefrom, a top plate closing the top of said hollow body portion, an arch plate closing the bottom of said hollow body portion and the inner sides of the hollow legs, end plates closing the edges of the hollow body and the outer sides of the hollow legs, bottom plates closing the lower ends of the hollow legs, an inclined partition wall within each hollow leg and spaced from the bottom thereof providing a sump in the lower end of each leg, means for circulating a fluid through said shell, said means comprising a fluid inlet pipe extending from an upper corner of the hollow shell to a point adjacent the center of the hollow body portion, conduits extending down into said hollow legs and through the partition walls therein, means providing communication between said inlet pipe and said conduits, hollow vertical water-cooled jamb guards fixed upon the exterior of said inner plate and substantially coextensive with said hollow legs, means providing communication between each sump and the lower end of the corresponding jamb guard, means providing communication between the upper end of each jamb guard and the hollow shell, a second inclined partition wall in each hollow leg spaced above the first named inclined partition wall and providing a second sump in each hollow leg, there being an opening adjacent the upper end of each second named partition forming communication between each second named sump and the corresponding hollow leg, second conduits extending down into said second sumps, means providing communication between said inlet pipe and said second conduits, and a fluid outlet at the other upper corner of the hollow shell.

3. In a hollow, water-cooled furnace door frame of the character described, spaced inner and outer plates having depending extensions at opposite side edges defining in part a hollow shell consisting of a hollow body portion and spaced hollow legs depending therefrom, a top plate closing the top of said hollow body portion, an arch plate closing the bottom of said hollow body portion and the inner sides of the hollow legs, end plates closing the edges of the hollow body and the outer sides of the hollow legs, bottom plates closing the lower ends of the hollow legs, an inclined partition Wall within each hollow leg and spaced from the bottom thereof providing a sump in the lower end of each leg, means for circulating a fluid through said shell, said means comprising a fluid inlet pipe extending from an upper corner of the hollow shell to a point adjacent the center of the hollow body portion, conduits extending down into said hollow legs and through the partition Walls therein, means providing communication between said inlet pipe and said conduits, hollow vertical water-cooled jamb guards fixed upon the exterior of said inner plate and substantially coextensive with said hollow legs, means providing communication between each sump and the lower end of the corresponding jamb guard, means providing communication between the upper end of each jamb guard and the hollow shell, :1 second inclined partition wall in each hollow leg spaced above the first named inclined partition wall and providing a second sump in each hollow leg, there being an opening adjacent the upper end of each second named partition forming communication between each second named sump and the corresponding hollow leg, and a vent adjacent the lower end of each second named partition, second conduits extending down into said second sumps, means providing communication between said inlet pipe and said second conduits, and a fluid outlet at the other upper corner of the hollow shell.

4. In a hollow, water-cooled furnace door frame of the character described, spaced inner and outer plates having depending extensions at opposite side edges defining in part a hollow shell consisting of a hollow body port1on and spaced hollow legs depending therefrom, a top plate closing the top of said hollow body portion, an arch plate closing the bottom of said hollow body portion and the inner sides of the hollow legs, end plates closing the edges of the hollow body and the outer sides of the hollow legs, bottom plates closing the lower ends or the hollow legs, a partition wall within each hollow leg and spaced from the bottom thereof providing a sump in the lower end of each leg, means for circulating a fluid through said shell, said means comprising a fluid inlet pipe extending from an upper corner of the hollow shell to a point adjacent the center of the hollow body portlon, conduits extending down into said hollow legs and through the partition walls therein, means providing communication between said inlet pipe and said conduits, hollow vertical water-cooled jamb guards fixed upon the exterior of said inner plate and substantially coextensive with said hollow legs, means providing communica tion between each sump and the lower end of the corresponding jamb guard, means providing communication between the upper end of each jamb guard and the hollow shell, a second partition wall within each hollow leg spaced above the first partition wall and providing V H 3,077,866 v 7 8 a 'second sump, second conduits extending down into References fiited in the file of this patent said legs and through said second partitions and termi- UNITED STATES A ENTS mating above said partitions, means providing communi- 1,211,884 Schmidt Jan 9, 1917 cation between said inlet pipe and said second Cond 5 2,529,272 Yoxall Nov. 7, 1950 and a fluid outlet at the other upper corner of the hollow 2,720,192 Humes' Oct. 11, 1955 FOREIGN PATENTS shell.

774,209 Great Britain May 8, 1957

Claims (1)

1. IN A HOLLOW, WATER-COOLED FURNACE DOOR FRAME OF THE CHARACTER DESCRIBED, SPACED INNER AND OUTER PLATES HAVING DEPENDING EXTENSIONS AT OPPOSITE SIDE EDGES DEFINING IN PART A HOLLOW SHELL CONSISTING OF A HOLLOW BODY PORTION AND SPACED HOLLOW LEGS DEPENDING THEREFROM, A TOP PLATE CLOSING THE TOP OF SAID HOLLOW BODY PORTION, AN ARCH PLATE CLOSING THE BOTTOM OF SAID HOLLOW BODY PORTION AND THE INNER SIDES OF THE HOLLOW LEGS, END PLATES CLOSING THE EDGES OF THE HOLLOW BODY AND THE OUTER SIDES OF THE HOLLOW LEGS, BOTTOM PLATES CLOSING THE LOWER ENDS OF THE HOLLOW LEGS, A PARTITION WALL WITHIN EACH HOLLOW LEG AND SPACED FROM THE BOTTOM THEREOF PROVIDING A SUMP IN THE LOWER END OF EACH LEG, MEANS FOR CIRCULATING A FLUID THROUGH SAID SHELL, SAID MEANS COMPRISING A FLUID INLET PIPE EXTENDING FROM AN UPPER CORNER OF THE HOLLOW SHELL TO A POINT ADJACENT THE CENTER OF THE HOLLOW BODY PORTION, CONDUITS EXTENDING DOWN INTO SAID HOLLOW LEGS AND THROUGH THE PARTITION WALLS THEREIN, MEANS PROVIDING COMMUNICATION BETWEEN SAID INLET PIPE AND SAID CONDUITS, HOLLOW VERTICAL WATER-COOLED JAMB GUARDS FIXED UPON THE EXTERIOR OF SAID INNER PLATE AND SUBSTANTIALLY COEXTENSIVE WITH SAID HOLLOW LEGS, MEANS PROVIDING COMMUNICATION BETWEEN EACH SUMP AND THE LOWER END OF THE CORRESPONDING JAMB GUARD, MEANS PROVIDING COMMUNICATION BETWEEN THE UPPER END OF EACH JAMB GUARD AND THE HOLLOW SHELL, A SECOND PARTITION WALL IN EACH HOLLOW LEG SPACED ABOVE THE FIRST NAMED PARTITION WALL AND PROVIDING A SECOND SUMP IN EACH HOLLOW LEG, THERE BEING AN OPENING IN EACH SECOND NAMED PARTITION FORMING COMMUNICATION BETWEEN EACH SECOND NAMED SUMP AND THE CORRESPONDING HOLLOW LEG, SECOND CONDUITS EXTENDING DOWN INTO SAID SECOND SUMPS, MEANS PROVIDING COMMUNICATION BETWEEN SAID INLET PIPE AND SAID SECOND CONDUITS, AND A FLUID OUTLET AT THE OTHER UPPER CORNER OF THE HOLLOW SHELL.

Images