US1879406A - Furnace arch construction - Google Patents

Description

Sept. 27, 1932. 'P. L A. MOREAU 1,879,406,

'FURNACE ARCH CONSTRUCTION y Filed March 23,- 1929 2 Sheets-Sheet l Sept. 21, 1932. P. l.. A. MOREAU FURNACE ARCH CONSTRUCTION 2 Sheets-Sheet 2 Filed March 23, 1929 tra Patented Sept. 27, 1932 UNITED STATES PATENT .PIERRE L. MOREAU, OFPARIS, FRANCE, ASSIGNOB T0 I. H. DETIC COIPANY'. 0l'

CHICAGO, ILLINOIS, A 'CORPORATION OF ILLINOIS summon non rcpomss'rmm'rrorr Application mea im); as, `1929.1 serial nu.. 349,154. y

This invention relates lto the construction of arches `for furnaces, articularly arches of the suspended type. t has to do principally with the construction of terminal portions of arches and portionsv in which the di rection of the arch surface changes.

A general object of the invention is the provision of a construction which will possess the usual advantages of suspended arches and certain further and novel advantages in regard to ease of assembly and repair, and accommodation of variations in size of the component refractories.l

More particularly, an object of the invention is the provision of a radial orconvex furnace arch construction `which may be assembled in conjunction with a at sus ended arch, in such relationship as to aifor effective protection for the metallicsupporting members of the structure, but without involving any particular relationship in the relative widths ofthe refractories used inthe flat arch and in the radial arch. p i

Yet another object is the provision of a novel form of refractory whereby radial arches possessing advantages mentlonedl above may be constructed, and "particularly qualified to give the radial arch a desirable Hexibility and avoid the subjection of its constituent refractories to pressures, such as might tend to break them from their mountings, consequent upon thermal expansion or contraction of the structure.

@ther and further objects of the invention will be pointed out orindicated hereinafter or will appear to one skilled in the art uponv an understanding of the invention or its employment in practice.

ln the accompanying drawings forming part of this specification I show one construe' tion representative of one form of embodiment of the invention. It is understood that this is presented merely by way of illustration and is not to be accorded any interpretation for the purpose of limiting the 'appended claims short of the true and Amost comprehensive scope of the inventionk in the Mart.

lln thedrawings Fig. l is a longitudinal section of the nose or terminal end of a suspended furnace arch;

Fig. 2I`is a detail, on al larger scale, illutrating in side elevation the form of a radial arch tile and its means of support;`

Fig. 3 is an end elevational view of an arch construction` with some of the radial tilesl removed, and l y y Fig. 4 is a perspective illustration of a. hanger for the radial tiles.

lThe employment of, sus nded arches for furnaces, wherein thearc refractories are has become quite general becauseof the recognized advantages of suspended arches,fpar ticularly where the spanof the arch is large and the conditions of lservice severe-` The wear on the arch, refractories is likely to be particularly severe in portions of the arch lwhere the surface exposed to the furnace heat on, suspended on metallic supporting members,

70 The refractories in such y i are likely also to be sub-A be given to the construction of these portions of the arch, with the object of safeguarding the refractories against the destructive inluences to which they are exposed, affording the metallic supporting members adequate protection from the furnace heat, and enfacility, .The present invention provides a construction wherein tiles of relatively small size may be employed in a radial orsalient arch portion, the tiles bein suspended indiyabling the refractories to be replaced with y vidually'so as to have a desirable `freedom of t movement and thus relieve` their supporting. parts of breaking strains, and whereby a tight or closely jointed'r'efractory arch may be formed without the'necessity of holding the tile to closely accurate dimensions. L

The natureof the invention will be most quickly understood by reference to the example shown in the drawings. In the construction here illustrated, let it be understood that the reference numeral l() designates supporting beams which extend over the furnace i chamber,xbeing suitably supportedon the l'furnace walls or other appropriateisupport 10 so as to maintain them at the desired elevation. From these beams cast iron arch bars 11 are suspended by meansof hangers 12.

These arch bars are providedwith marginalr Iflanges 11 which constitute retaining sup-k Fig. 1. A plurality of the courses of refracn tories 14, thus suspended on arch bars 11, are

arranged side by side,asinF%,lto formafiat suspended refractor arch. ere it is desired to change the iretion of the arch surface vertically, as at the terminus of the arch, supporting barsl or brackets, as illustrated by the bracket 15, are arranged, being suitably supported in position and provided with hanger supports 15". In the construction illustrated the brackets 15fa're supported directly on the ends ofthe arch bars 11, but it is obvious that they may besu" ported in any other suitable fashion. Upon t e hanger supports 15are supported the tile hangers 16, same preferably being susceptible of adjustment to'diierent elevations] The hangers here illustrated, as shown in detail in Fig. 4, are cast iron members formed with oppositely disposed jaw portions 16 affording an interveningslot with overhanging suspension lugs 16b Vadapted to engage over the hanger supportsl, and having ledge portions 16 pro]ecting forwardly from the webs of the' jaw portlons. The jaw portions preferably vare deflected, as best seen in Fig. 2, so that the supporting lugs 16b overhangthe'ledges 16. The ledges 16cpreferably are'straight longitudinally, but curved transversely so as to have a channel-like form.. They may be readily slid onto and olf of the hanger supports 15", and whenV supported thereon are susceptible of swinging movement. A suitable stop, here afforded by the end of the arch bar 11, is arranged to limit the movement of the lowermost hanger in one direction. A 'row ofv these hangers is arranged alongthe margin of the flat arch, as illustrated in Fig. 3so ythat the ledges 16 of the several hangers are approximately in alignment. The length of the ledges 16c preferably is such that there are only narrow intervening gaps between the ends'of juxta-v posed hangers. Upon these ledges are suspended the radial tile 17. `These .are wedgeshaped, theirfront and vrearfaces beingvin Vconverging-relationship, and their lateral r faces being parallel; At their narrow ends they are formed. with lateralv grooves or notches 17, toform overhangingk suspension lugs having the hanger-engaging part 17 b approximately on the median line m--n' of the tile, and the slightly depending nose part 17 part 17" is preferably appreciably greater than the width of the up-turned margins of the ledges 16 upon which they rest, so that the tile is afforded a range of shifting movement in front-to-rear directions, this for accommodation of expansion in the arch structure, so that injurious stresses will not be imposed on the outer ends of the tile lugs.

One tier of the refractories 17 having thus been positioned on the lowermost row of hangers, a second row of hangers is placed on the brackets 15,' and a second'tier of refractories 17 arranged thereon as above described. The third row of hangers and third tier of refractories 17 are similarly positioned. Y

By virtue of this construction, the width of the refractories 17 may be made very much less than the width of the refractories 14. As shown in Fig. 3, the refractories 17 are aproximately one-third of the width of the reractoriesv 14. The length of the refractories 17 should be such that their lower end faces will mer e with the lower end'faces of the associate refractories 14 and with associated vrefractories 17, so as to give the arch a regular or uniform lower surface. Substantial advantage is gained by having the refractories 17 of relatively small size. In the first f this manufacture and place, this facilitates ecreases their cost, pe its their density to be more readil controlled and enables them to be more rea ily'and thoroughly burned in the course of manufacture.' These factors n contribute to their uniformity of quality and also to their ability to resist the destructive wearing influences of the furnace heat and erosion when in use. In the second place, the

small sizeof these refractories minimizes thel ity, permitting it to accommodate thermal 7- expansion vand contraction of the refractories ,without subjecting their supporting portions to breaking strains. As a result of these various factors, the radial arch is particularly qualified to avoid spalling and rapid erosion of the component refr'actories. Moreover, the construction greatly facilitates not only Athe original assembly of the structure, but

also the replacement of the radial refractories when'it becomes necessary to renew them.

' served that while the first grou the refractories 17T,

i that the radial tiles,

lill

of the associated Another distinct advantage ofthe construction resides in the fact that the width of the radial refractories does not have to be held definitely to a certain proportion of the width refractories 14. This is brought out in Fig. 3, wherein it will be obthe aggregate width of of radial refractories, desige same as that of the aligned course of the refractories llet, the aggregate width of the second group of radial refractories somewhat exceeds the width of the associated course of the refractories 14, the terminal refractones overlapping the third course of the refractories 14. Thus variations in the `width of do not in any manner afof the arch, as the juxtamay always be placed in naad A, is t feet the tightness posed refractories closefabutment across the entire width of the arch, any discrepancy in the aggregate width being accommodated in the overlap'of lthe margin of the arch over the furnace wall.

The refractories 17 are of a shape which may be manufactured with facility and without disproportionate loss from spoils in drying and support engaging portion 17b is quite close to the part which connects the overhanging lug to the body ortion and approximately over the center o cause of this feature the overhanging lug is not subjected to any great leverage from the weight of the tile, such as would be the case if the tile were supported on the extending part of the lug, such as the nose 17.

This nose portion, it will be observed, does not carry any of the weight of the tile, but unctions simply as a retaining member to aid in keeping the tile from slipping off from the hanger. It will be apparent also as supported in the arch structure, are susceptible of movement in the arc of the arch and also transversely of the arch, without decreasing the security of their support or imposing excessive stresses on their supporting portions. at I claim is:

1. In furnace arch construction, in combination, a plurality of hangers disposed in a row and having tile engaging portions dispose in alignment end to end to form a ledge having an up-turned outer margin, side slotted refractories supported on said hangers and bearing thereon solely on said up-turned margin and movable longitudinally thereof from one to another of said hangers, said refractories depending below said ledge and arranged in abutment to form tion.

2. In furnace arch construction, in combination, a hanger formed with a channel-like ledge, and a wedge-shaped tile formed with a lateral groove adjacent its narrower end, said groove being of sufficient width to perof the second group burning. It will be observed that the' gravity of the tile, and be-` an arch por# said part out of contact with the ledge when the tile is suspendedthereon.

3. As an article of manufacture, a furnace arch portion consisting of a refractorytile having converging mar inal sides and parallel lateral faces, said ti e being provided adjacent its narrower end with a transverse groove extending inwardly from one of the converging faces and openin at the lateral faces, the portion of the ti e overhanging said groove being formed adjacent its inner end with a support engaging portion approximately on the longitudinal median line of the tile, and at its outer end with a depending nose portion.

,4. As an article of manufacture, a furnace arch portion consisting of a wedge-sha d refractory tile provided adjacent one en of one of its converging sides with a transverse lateral groove, 'a portion of the tile overhang ing said groove being formed .adjacent its inner end with a flat supportengaging portion and adjacent its outer end with adepending nose portion, extending from approximatel the median line of the tile for an appreclable distance so as to permit the tile to shift on a supporting member engaging the same between said dlepending nose and the inner limit of said s ot.

In testimony whereof I have hereunto sub scribed my name.

PIERRE L. A. MOREAU.

the support engaging portion

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