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Патент USA US3068030

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Dec. ll, 1962
Filed April 21, 1961
f4 45
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Stats twee
Patented Bec. ll., ‘i932
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
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.
be highly corrosive upon dispersion into the normally
moist air characteristic of a major portion of the North
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.
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
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
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
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
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
No references cited.
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