US2529272A - Flared jamb furnace door frame - Google Patents

Description

Nov. 7, 1950 J. YoxALL FLARED JAMB FURNACE DOOR FRAME Filed March 16, 1948 Patented Nov. 7, 1950 NITE-o STATES PATE-NT OFFICE FLARED '-JAMB' FURNACE DUORFRAME John YoxalL Detroit, Micht `fApplication-March 16, 1948,*1Serial No.'1f5,093

k3 Claims. (01.-.122-499) This invention' relates to furnacedoor. frames and inparticular to Water-cooled furnace door frames.

lOne object of this invention is to provide a hollow water-cooled furnace doen-.frame for industrial 'furnaces suchas open. hearth furnaces Lor the like, .wherein awater-cooled flaredv portion is'providedon each sideor jamb of the door framediverging inward atsuch anangle as to protect' the' door frameand the adjacent brickwork from damage, particularly that occurring during the withdrawal of charging boxes or other equipment inserted through and Withdrawn from the door frame.

Another object is to provide a flared-jamb. fur-- nace door frame wherein the inwardlyflared prtions of the jambs are'hollow so-as to be watercooled in .asimilar manner to'theremainder of the door frame.

Another object lis. lto provide a ared-jamb furnacel door frame wherein the inwardly-flared portions ofthe jambs are hollow and are' interconnected attheir upper -ends byY a hollow waterf cooled extension lof the lintel of the door'frame,

'so constructed and arranged'as to protect and cool" they skew-back channel Which-extends across thefurnace at the upperpartfof the' door frame andwhichfserves tof-support the arched'furnace roof.

Inthe drawings:

'Figure lis a front elevation of the front wall of an openhearth'furnace showinga furnace door frame equipped with the flared-door'jambs according to a preferred form` of the vpresent inventiOn;

AFigure 2A is a' vertical section taken along the line'Z-ZY irl/Figure 1, showingv the Iflared jamb door frame mainly in VA'side elevation;

Figure 3 is a top planv view, partlyk in'section,

of the flared-lamb door frame ofthe-present invention,-with the skew-back channel Aremoved to showv the-'parts beneath it;

'Figure 4 is a vcentral vertical section through the lintel and skew-back channel of the door iframe' of Figures 1,2 and'3, taken along the `line "4-4 in'Figure 1; and

Figure 5-isv fragmentary horizontal section through one ofthe flared jambs and adjacent masonry, taken ralong the'line 5-'5 in Figure 1.

Water-cooled furnace door' frames for indus-3' vtrial furnaces, such as open hearth steel furnaces, are widely used in the steel industry. Such door frames, however, are frequently damaged `and their life shortened by'collisions between charg-A `ing boxes and other equipment 'being withdrawn"l :fromatheffurnalcet and .the lambsv or verticalside :"membersf'of "the door frames.- Occasionally the door frame is torn bodilyfaway from theA adjacent ib-ric'kwork while :the charging *box is beingf re- 5 f moved; 'causing major repairs to' be made to the door "frame for requiring "complete replacement ithereof.l

.The door". frame 'of thepresent inventiongreatfly: reduces'or eliminates such damage due to co1- .lisi'ons by providing'thedoor'jambs Orvertical sidennembers of the 'door'yfra'mef'with inwardly flared extensions, 'the' :walls thereof diverging inward. These extensions,like the mainportions ofthe door'frame, are'hollowand water-cooled sof-.as 'to further reduce fthe: .destructive effects of heat. The flared jambV portions are interconnectedvat' their. upper ends by the hollow'horizonitalmember. or lintely extension which'projects inward from the lintel of the doorframe Aand serves .20 to cool and protect the skew-back channel which feXtends-'acrossthe top of the Afurnace above the loloorv opening and which serves to supportthe rthrustl of the arched furnace roof.

'By reason of this constructiomwhen the charg- 251 ing' box or other equipment is withdrawn through -lthedoor framean'd accidentally collides with the Aflared jamb extensions, it glances off the diverg- Ming walls'thereof'because it hits themyat an angle. This construction-also prevents vthe pulling out lof." the door frame vwhile withdrawing the charging' box or other equipment, as the inclined side f-walls of the 'flared' jamb extensions safelyguide and deflect this equipment toward the door open- 'ing-withoutproviding any abutment surface or shoulder upon which it could gain a hold. At the 'same `time,`the' hollow water-cooled construction fof these'fiared-jamb extensions further reduces the damage v"ther-"etcvwhich might be caused bythe extremeheat tovwhich these areesubjected. The

'-40 hollow lintel extension extending across the door frame above the tops of the flared jamb extension @protects the skew-back channel from vsuch damage.

H:Referring tothe drawings in detaiL'fFi-gures' 1 @La and Zishow a furnace door frame generally designated I Il according'e to a preferred form of the invventiorras `applied to an archless'doorway openingjl I of an open'hearth furnace, generally desigvhated l2. The doorway or door opening Il is formed between' a'pair oflaterally-spaoed piers Hor-jamh walls I3 of refractory masonry, which haveinwardly-stepped portions I4 lforming Aa reduced width opening I5 (Figure 3). The piers I3 are -strengthened`by'vertical"members I 6 embed- '55 ded inthe'masonry piers I3. v'Thepiers' I3are interconnected by a foreplate or sill I1 of steel or other suitable material which rests upon the usual breastplate I8.

The opening I9 in the doorway |0 is optionally closed for a portion of its height by a refractory masonry forewall which serves as a dam to raise the level of the contents of the furnace to a greater height than the level of the door sill I1 and thereby increase the capacity of the furnaceV I2.. Extending across the Vtop of the door opening |5 is the usual steel skew-backv vhollow rib portions 29 extending forward there- `from at the outer edges thereof. The rib portions 29 are substantially at right angles to the main jamb portions 23 so as to guide the furnacedoor (not shown) in its vertical sliding movement for opening and closing the door frame opening' 38. The door frame jamb portions 28 are intercon- -nected by a horizontal lintel portion 3| extend- .ing over the door frame opening 30 and forming the upper boundary thereof. Like the jamb portions 28, the lintel portion 3| is hollow for water cooling purposes. Welded to the upper edge of the lintel portion 3| is a plate 32 which has welded thereto a pair of eyes 33 by which the door frame I0 may be handled, as by an overhead travelling crane.

Extending inward from 'the jamb portions 28 are hollow flared jamb l extensions 34 having inner side walls 35 inclined relatively to the jambV side-wall 35 so as to diverge inwardly therefrom (Figure 5) toward the inner jamb extension wall 35.- The outer walls 31 of the jamb extensions 34l are set inwardly from the outer walls 38 of themain jamb portions 28, leaving a stepped portion or rear wall 39 between the walls 31 and 28. The jamb extensions 34 commence at a height above `the door sill or foreplate |1 approximately atut-he level of-.the top of the forewall 20, with which its bottom wall 40 approximately coincides (Figure 2). `The upper ends of the jamb extensions34 are interconnected by a hollow lintel extension 4| which extends across the door opening-immediately below the bottom edge of the skew-back channel 2 I. The bottom wall 42 of the lintel` extension 4I is stepped above the bottom wall 43 of the lintel portion 3| (Figure 4) with a vertical wall 44 therebetween. f

In order to cool the various internal spaces within the door frame I0, a water inlet pipe 45 is provided at the upper left-hand endvof the lintel portion 3 I, and is connected at the coupling 48 to a pipe 41 leading to a source of cooling water. The inlet pipe 45 extends downward through the lintel portion 3| to a port 48 in the forward wall 49 of the lintel extension 4|. From side ports 50 and'5l in the forward wall 49 of the lintel extension 4I the pipes 52 and 53 extend downward within the jamb portions 28 and have their lower ends 54 and 55 (Figure 1) terminating a short distance above the bottom wall 56 thereof. Clean-outplugs 514 are provided at the lower ends of the hollow rib portions 29. 'In order to carry away the heated water andsteam, an outlet pipe 58 (Figure 1) leads upward from a port 59 at the top of the lintel portion 3| and is con- 5 nected as by the coupling 6l! to a pipe 8| which leads to a point of disposal or to cooling apparatus.

In the operation of the invention, cooling water passes downward through the pipe 45 into the interior of the lhorizontal lintel extension 4I, cooling this element, which is at an extremely hot portion of the furnace, and thereby protecting the bottom of the skew back channel 2| from deterioration under this intense heat. From the lintel extension 4|, the cooling water passes outward through the ports 50 and 5| downward through the pipes 52 and 53 and out through the lower ends 54 and 55. The water rises upward through the hollow jambs 28 and a portion of it enters the port 6 2 at the lower end of the jamb extension34 (Figure 2) to cool the latter. The heated water'or steam generated as thewater flows upward through thek jamb extensions 34 passes intothe lintel extension'4l `from the top openings in the jamb extensions 34, joining the water suppliedY vdirectly theretofrom Vthe pipe 45. Thisjwater, as previously stated,v is discharged downwardly through the pipes 52 and 53 into the hollowV jambs 281 The watercontinues'to rise vin the jambs 28 landi-lowsI intothe interior ofthe horizontal lintelportion 3|whence the mixed water; and steam ow out through the outlet'port 59 and pipe 58 into the pipe 6| which carries them away.

When the charging box or other equipment is inserted through the door opening A3|! into the interior of the furnace and is thereafter withdrawn, it causes no damage to the furnace door IE) because if it collideswith theinclined walls 3-5 ofthe jamb extensions 34, it does so at an oblique angle. As a consequence, it glances `off these inclined l.orifiared walls 35, which deect it toward the opening 30 as ,it is withdrawn. In actual tests, of .affull-size embodiment of this door front, it has been found that the door front of the present invention far outlasts the conventional door front, evenV outlastingv the masonry such as the arched roof 21. It was further found that the door frame of thepresent invention greatly extended the life of the masonry piers I3, whichvpreviously had y-had to be renewed at frequent intervals. As aresult, therefore, the door frame of the present invention has a greatly prolonged life over conventional door frames. and therefore results in a great saving in labor and materials, as well as a substantial lowering of the time period during which the furnaceis shut down for repairs or overhaul.

What I claim is:

1. In a hollow liquid-cooled furnace door frame and skew back channel cooler, hollow jamb portions forming sides of the frame, a hollow lintel portion forming a top, of the frame, hollow elongatedqflaredjamb extensions extending upwardly along and projecting inwardly from vsaid jamb portions toward the-furnace chamber, a partition between ,eachl jam-bvportion and its respective jamb extension dividing the same into separate liquid channels, cooling liquid inlet and outlet conduits connected-to vsaid portions and communicating .with` vsaid jamb extensions, vand a hollow lintel extension extending between the tops of vsaid jamb vextensionsand having liquid 'passageways 'l communicating therewith,l said lintel extension extending inwardly toward the furnace chamber from said lintel portion.

2. In a hollow liquid-cooled furnace door frame and skew back channel cooler, hollow jamb portions forming sides of the frame, a hollow lintel portion forming a top of the frame, hollow elongated ared jamb extensions extending upwardly along and projecting inwardly from said jamb portions toward the furnace chamber, a partition between each jamb portion and its respective jamb extension dividing the same into separate liquid channels, cooling liquid inlet and outlet conduits connected to said portions and communicating with said jamb extensions, and a hollow lintel extension extending between the tops of said jamb extensions and having passageways communicating therewith, said lintel extension extending inwardly toward the furnace chamber from said lintel portion, said liquid inlet conduit being connected to said lintel extension and the lower portions of said jamb extensions being connected to and communicating with said jamb portions.

3. In a hollow liquid-cooled furnace door frame, hollow jamb portions forming sides of the frame, a hollow lintel portion forming a top of the frame, hollow elongated ared jamb extensions extend- REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 530,539 LeysOn Dec. 11, 1894 737,937 Kenely Sept. 1, 1903 1,391,197 Law Sept. 20, 1921 1,407,708 Thornton Feb. 28, 1922I 1,605,566 Rosenberg Nov. 2, 1926 1,935,853 McAfoos Nov. 21, 1933 2,246,403 McDonnell June 17, 1941 2,427,547 Bulmer Sept. 16, 1947

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