Патент USA US3068030код для вставки
Dec. ll, 1962 A. J. ROUBAL 3,068,015 SEAL FOR ROTATING CYLINDERS SUCH AS KILNS AND THE LIKE Filed April 21, 1961 E . 50 ß' ‘._m f4 45 H33 ‘ff-322 i@ Í/ ///l// //// /// // /Í 24 \\\\` \ \ \\\\ \\\ \\\\ Stats twee Patented Bec. ll., ‘i932 1 2 3,068,015 out-of-round kiln and result in the collar portion of the ring engaging the kiln too tightly at spaced locations around the shell while at the same time leaving openings that tend to reduce or defeat the eñectiveness of the seal SEAL FÜR RG'EATHNG CYLINDERS SUCH AS KILNS ANB THE LiKE Alexander I. Roubal, Milwaukee, Wis., assigner to Allis Chalmers Manufacturing Company, Milwaukee, Wis. Filed Apr. 2l, 196i, Ser. No. M4554 5 Claims. (Cl. 277-8?) The present invention relates generally to sealing rings and more particularly to a novel seal for rotating cylinders, such as kilns and the like, which are used in combination with auxiliary equipment at the ends thereof whereby the ingress yand egress of substantial amounts of diluent and contaminating iluids therebetween are significantly re duced to a controllable and tolerable minimum. In the description of the present invention, rotary kilns have been chosen to exemplify rotary cylinders of the type herein contemplated although the present invention is not intended to be so limited. ing ring to do the job heretofore described. According to the present invention a sealing ring, L shaped in cross section, is provided that is made up of segments. The segments are arranged to form a complete ring around the kiln. The segments are held in engage ment -with each other and the outer shell of the kiln by one or more cables wound around and secured to the axially extending (and kiln engaging) collar portion of the segments. The segments may initially be bolted to gether during the assembly thereof but once the cables 15 are arranged and secured any such bolts are removed so the ring of segments can easily conform to an out-of round shape of the kiln. Adjacent segments engage each other by overlapping joints so that, for example, when a kiln thermally expands to a larger diameter, the cables Essentially, the problem encountered and solved bythe 20 will be stretched but no spaces for leakage will open between adjacent segments. present invention arises, for example, in connection with Accordingly, one of the primary objects of the present the' processing of material in a rotating kiln having a material feeder at one end of the kiln and a firing hood and burner at the other end. It is the normal practice to attach such apparatus as a firing hood relative to the kiln invention is to vprovide a suitable kiln air seal which con forms easily to engage a warped out-of-round kiln, to maintain it in sealing engagement over the annulus inter in telescopic fashion, i.e., the hood will surround and overlap the end of the cylinder. Such telescopic arrange mediate the auxiliary equipment and the kiln. Another object of the present invention is to provide an improved sealing ring which can be easily stretched to accommodate thermal expansion of the circumference of ments must be loose, that is, an annular opening must be provided between the surrounding equipment and the surrounded equipment to permit, particularly at the burner 30 the kiln and maintain sealing engagement over an annular opening circumscribing the kiln. end, and maintain the continual free rotational movement Another object of the present invention is to provide of the kiln in spite of the thermal distortion normally an improved sealing ring of segmented construction that attendant such a setup. Further, the annular opening is provides for relative movement between segments without essential because the equipment settles on its foundation which, even though slight, is sufficient to further bind the 35 opening passages therebetween, through which leakage can occur. pieces if the opening were not provided. These and still further objects are fulfilled by the pres With such an annulus present, however, processing problems arise. Thus an ingress of air from the surround ent invention in a manner that will appear from the to mineral processing. Further, an egress of exhaust gases (irrespective of whether countercurrent or parallel ln the drawing, FIG. l is a fragmentary side elevation in section, showing a rotary kiln embodying the present gas flow is employed) spreads dust and, depending on the material treated, foul odors to the nearby community. invention; be highly corrosive upon dispersion into the normally moist air characteristic of a major portion of the North clarity; following detailed description when read in conjunction ing atmosphere through the annulus dilutes the burner gases and greatly impairs the fuel economies so essential 40 with the accompanying drawing. FIG. 2 is a fragmentary view taken along line `ll-Il’. Certain materials treated in this manner are also found to 45 of FIG. l with details of the kiln being omitted for FIG. 3 is a fragmentary view in section taken along line Ill-lll of FIG. 2; and FIG. 4 is an enlarged fragmentary View of a portion A further problem arising from an unattended annulus is in the control of the draft. Thus, whe-re a burner is 50 of the structure shown in FIG. 2 taken along line IV-IV American industrial area. used to create a reducing atmosphere in a kiln by ñood of FIG. 2. ing with fuel and controlling the oxident (as in the pro duction of sponge iron and the like from its oxide salts), ln FIG. l, a conventional rotary kiln 11 inclines slightly downwardly toward a burner hood 13 to assist in the translation of material therethrough. Kiln l1 comprises it is essential that the additional oxygen from the air be precluded from the kiln to avoid upsetting the desired 55 a tubular shell 14 having an internal lining 15 formed of fuel-oxygen ratio and which could radically change the a suitable refractory material such, for example, as re operating conditions in the kiln. fractory bricks. Y According to the teachings of the prior art, a relatively rigid annular sealing ring is usually provided to enclose Suitable drive means (not shown.) are provided for rotating the kiln. An annular end plate 16 is secured at the end of shell such an annular opening and overcome the aforemen 60 14 and defines a substantially circular opening 1'7 (here tioned problems. after called “discharge opening”) through which the mate rial, after treatment in the kiln is discharged to conveyors, coolers and the like according to the exigeneies of the is, the ring comprises an axially extending collar portion material being treated. engaging an outer circumference of the kiln, and a radially extending flange portion engaging kiln-surrounding struc 65 A cooling jacket 2t) may be provided in circumscribing relationship to shell 14. Such a jacket is found par ture of a hood assembly. However, since the kiln is ticularly desirable when the material being processed frequently of very large diameter, it is quite diñicult to requires high temperatures. When exceedingly high tem make it perfectly round. Furthermore, once in operation The ring is frequently L shaped in cross section. That peratures are used, the discharge end encounters severe the very high temperatures within the kiln may cause warping that results in the kiln being even more out of 70 thermal conditions. The use of a cooling jacket, there round. The relatively rigid sealing rings of the prior art fore, helps to dissipate some of the heat from the end of do not easily or completely conform to the shape of an the shell to overcome to a, certain extent the serious dis spasms E tortîon otherwise resulting from the action of the heat on the metal shell. Adjacent the discharge end of kiln 11, burner hood 13 comprises a housing 22 having a lining 23 formed of a nearly so, are to be preferred, however, because then an unintentional loosening of one or even several of the jaw assemblies will not cause Vthe ring to come apart as might happen if short strands of cable are used. ventional burner 24 through Whichis fed the mixture of‘ From the foregoing it can be appreciated that the present invention provides a seal for kilns and the like cooling jacket 2t?, annular opening 28 is adjusted in occur. dimension to define annulus 29 with the shell 14. A bearing ring 39 may be attached to a portion of hood accomplishes the objects of the inventions previously re suitable refractory material. Hood 13 contains a con that will be durable, relatively inexpensive, can be readily fuel and oxygen desired for the specific process to be assembled and disassembled when necessary. Further employed in the kiln. more, the present invention provides a seal that will con Hood housing 22 includes a front Wall 27 having deñned therein an annular opening 2S which circumscribes the 10 form to a warped or otherwise out-of-round kiln, stretch to accommodate thermal expansion of the kiln, and all cooling jacket 2t) to define an annulus 29 therebetween. without opening passages through which leakage can Where the particular kiln application does not require a front wall 27, and extend radially inward from opening 28. An annular sealing ring 33 shown in FiG. 2 is arranged (see FIG. l) in circumscribing relationship to shell 1.4 for closing _annulus 29 to the passage of gases therethrough. Thus it can be seen that the described construction ferred to as well as others. However, modifications and equivalents such as readily occur to those skilled in the art are intended to be included within the scope of this invention and thus the invention is intended to be limited Ring 33 as shown in FIG. 2 is made up of a plurality 20 only by the scope of the appended claims. of segments 35. The segments 35, see FIGS. 2, 3 and 4, each have a cylindrical collar forming portion 36 and an annular flange forming portion 37 projecting radially outward from the collar portions 36. The segments 35 Having now particularly described and ascertained the nature of my said invention and the manner in which it is to be performed, I declare that what I claim is: 1. A segment adapted to coact and form with similar are tied in a ring around the kiln 11, for example as 25 segments an annular sealing ring >presenting a cylindrical collar adapted to engage and be tied around an outer sur shown in FIG. l, with the collar forming portions 36 engaging the outer circumference of cooling jacket 20 and the ñange forming portions 37 engaging bearing ring face of a cylidrical kiln by a circumferentially arranged cable and an annular ñange projecting radially outward of the cylindrical collar, comprising, an adjoining cylinder 30. The individual segments 35 are tied together, to form the ring 33, in a manner that can best be described 30 forming portion and radially outward flange forming por tion, a jaw arranged radially outward of the cylinder with reference to FiGS, 3 and 4. As shown in FIGS. 3 and 4, a pair of bolts 40 project radially outward through each collar portion 36. The forming portion, the jaw and the cylinder form the inner circumference 3S is a smooth surface for engag ing kiln 11 in the manner previously described. A jaw forming portion operative to move the jaw radially inward toward the cylinder forming portion. ing portions being adapted to grasp therebetween a cable arranged parallel to the flange forming portion, and bolts 4t) have a head 41 that is ñtted in a recess 42 in an inner circumference 38 of collar portion 36 so that 35 clamping means engaging both the jaw and the cylinder 2. A segment according to claim l in which the radially inner surface of the jaw and the radially outer surface of jaw 45. The bolts 40 are each threaded to engage a nut 40 the cylinder forming portion deñne therebetween a cable encircling passage parallel to the flange forming portion. 47 which when turned to advance along bolt 40 toward 3. A segment according to claim 1 in which the clamp the head 41, moves the jaw 45 radially inward toward the ing means comprise a bolt projecting radially outward collar forming portion 36. A pair of cables 50, 51 are through a cylinder forming portion and the jaw, and a arranged between jaw 45 and collar portion 36. The cables 50, 51 are parallel to the ñange forming portions ' nut engaging the bolt radially outward of the jaw and operative to advance along the bolt in a radially inward 37. One of the cables, i.e. 51, is on the side of bolts 40 direction to move the jaw toward ythe cylinder forming closest to ñange 37 and the other cable, i.e. 50, is on portion. the side of bolts 40 remote from ñange 37. The radially 4. A segment according to claim 3 in which the radially inward surface of jaws 45 and at least the areas of collar inner surfaces of the jaw and the radially outer surface portions 36 facing jaws 45, are shaped to deñne encircling of the cylinder forming member define therebetween a passages 52, 53 for gripping the cables 50, 51. pair of cable encircling passages, with both of the passages When assembling the ring 33 around the kiln 11, bolts being parallel to the flange forming portions, and with (not shown) may be temporarily inserted in the holes 60 the bolt projecting outwardly between the passages. in the lugs 5I, see FIGS. 2, 3 and 4, to form a ring. After 5. Apparatus comprising a stationary structure and a the cables are strung and secured by the clamping and rotating cylindrical shell telescopically arranged therein, gripping action of jaws 45, such bolts may then be -the‘shell coacting with the stationary structure to define removed. an annular opening therebetween disposed in circumscrib After temporary bolts have been removed, the ring 33 ing relation to the shell, and a sealing ring circumscrib may flex to conform to shape of the engaging surfaces. ing the shell adjacent the stationary structure and closing An overlapping contact between adjacent segments is pro the annular opening, the sealing ring comprising a plu vided as shown at 63 in FIG. 4. Thus adjacent segments 45 having a hole 46 is placed over each of the bolts 40. The bolts 40 project through and `radially outward` of each can move relatively to each other without opening pas sages for leakage into or out of kiln 11 and hood 13. With the arrangement described wherein a pair of jaws 45 are mounted on each segment 35, it is not necessary that the cables 50, 51 each be continuous strands as shown in FIG. 2. The segments can be joined by short lengths of cable, as short as the portions of cables 50, 51 that are shown in FIG. 4. Cables that are continuous, or rality of adjacent segments each having a cylindrical collar forming portion engaging the shell and a radially outward flange forming portion engaging the stationary structure, and a cable tied around the outer circumference of each of the cylinder forming portions of the segments to hold the segments in conforming engagement with the shell. No references cited.