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Патент USA US3098517

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July 23, 1963
L. o. BAGNALL
RADIAL EXPANSION COMPENSATING SUPPORT FOR
THERMALLY EXPANSIBLE BODY
3,098,509
Filed Sept. 11, 1962
‘gm/914M
United States Patent 0" ice
i
Patented July 23, 1963
2
. counterclockwise as indicated by arrows in the drawing),
3,0§8,509
RADIAL EXPANSEGN CQENSATHNG gUPPQRT
FOR THERMALLY EXPANSEBLE BODY
Larry 0. Bagnail, Waukesha, Win, assignor to Allis
Chalmers Manufacturing Compan‘ , Miiwaukee, Wis.
Filed Sept. 11, 1962, der. No. 222,787
6 Ciaims. (Cl. 138-114)
ted, ?red, etc. all by conventional devices, not shown.
The kiln .1 has an outer combustion tube 2 surrounding
an inner reducing tube 3 which is to be maintained in
coaxial alignment within the combustion tube 2 by an
arrangement according to the present invention, such as
will be described.
The aligning and supporting arrangement vfor tube 3
includes rods 4, 5 secured to diametrically opposed loca
This invention rel-ates generally to a support system
for conduits, containers and the like for handling heated 10 tions on the outer surtace of tube 3. Rods 4, 5 each
project radially outward ‘from tube 3 and through com
materials that are therefore exposed to variable tem
bustion tube 2-. Pistons i6, 7 are joined to end portions
peratures that cause expansion and contraction of shell
of rods 4, 5, respectively, external to outer tube 2. The
structure. ‘More particularly, this invention relates to
pistons 6, 7 are arranged within cylinders 8, 9, respec
supporting the inner tube or” a pair of concentric tubes as
tively, which are secured to and rotate with outer tube
in double tube reducing kilns.
2. Piston 6 de?nes a chamber 10* within cylinder 8
radially outward of piston 6. Piston 6 also de?nes. a
chamber 11 within cylinder 8 radially inward of piston
6. Likewise, piston 7 de?nes chambers 12 and 13 within
delivered to the combustion space between the inner and 20 cylinder 9. A ?uid transfer conduit 14 connects chamber
iii in cylinder 8 to chamber 12 in cylinder 9. A second
outer tubes where the mixture burns to heat the inner
?uid transfer conduit 15 connects chamber 11 in cylinder
(tube and contents thereof in a reducing atmosphere.
8 to chamber 113 in cylinder 9.
Since the combustion gases do not actually come in con
In the operation of the present invention, with the
tact with material to be reduced in the inner tube, sut
?cient air may be supplied to the combustion space to 25 kiln 1 positioned to present cylinder 8 in the elevated
position and cylinder 9 in the lowered position, as shown,
e?‘iciently and completely burn the fuel at high tempera
chamber 13, conduit 15 and chamber 11 ‘will be ?lled
tures. It is desirable to maintain at all times the coaxial
(through a suitable tap not shown) with such as a hydrau
relation of the two tubes to provide tor a smooth flow
lic ?uid. Su?icient hydraulic pressure is admitted to and
and even distribution of combustion gases around the
trapped within chambers 13, 11 and conduit 15' to lift
reduction tube to evenly heat the reduction tube and its
tube 3 into concentric arrangement within tube 2. With
contents.
a plurality of axially spaced supports of the nature de
Accordingly, it is an object of the present invention
scribed, coaxial alignment can be provided. Chamber
to provide a new and improved support system for a
12, conduit 14 and chamber 10‘ will then be similarly
thermally expansible body. A more speci?c object of
?lled with hydraulic fluid. The entire kiln 1 can then be
course is to provide such a new and improved support
slowly turned 180 degrees to reverse the positions of
system ‘for supporting a reduction tube in continuous
cylinders 8, 9. With chamber 10, conduit 14 and cham
concentric-coaxial alignment within a surrounding com
ber 12 then supporting tube 3, the pressure therein can
bustion tube.
be increased to again bring tube 3 concentric to tube 2
According to a preferred application of the present
40 and when this is repeated at all similar supports coaxial
invention to a reduction kiln, a pair of rods are secured
alignment will be achieved. The entire kiln can then be
to the outer surface of a reducing tube in a diametrically
rotated and fuel and air ?red in the space between tubes
opposed arrangement to project radially outwards of the
2 and 3. As the inner tube 3 expands and when cyl
reduction tube and through a surrounding combustion
tube. The portion of each rod projecting outwardly 4.5 inder 9 is in the lowest position, as shown, the expansion
will result in thrusting piston 7 downwardly and piston 6'
from the outer combustion tube joins a double acting
upwardly thus increasing pressure in chambers 13 and
piston within a cylinder mounted on the outer surface
10. Not only do such forces balance each other but by
of the combustion tube. Each piston de?nes a chamber
the conduit-s i4, 15 the increased pressure under piston 7,
within its cylinder radially outward of the piston and
another chamber radially inward of the piston. A ?rst 50 from a downward movement thereof, provides an
?uid transfer conduit is provided ‘from the radially outer
equalized (through conduit 15) pressure below piston
chamber of a ?rst of the cylinders to the radially inner
6 providing an increase in upward force. This further
chamber of the second of the cylinders; and a second
equalizing of radially opposite forces continues without
?uid transfer conduit is provided from the radially inner
interruption as the kiln rotates and the concentric (and
chamber of the ?rst cylinder to the radially outer cham 55 coaxial) arrangement is always maintained regardless of
ber of the second of the cylinders. Thus cross connec
thermal expansion and contraction of tube 3.
tions are provided between oppositely arranged chambers
The described structure and operation can also be ap
in diametrically opposite cylinders.
plied to nonrotating bodies. If structure such as shown
Each of the chambers interconnected in the manner
in the drawing does not rotate, then conduit 14 is not
described and the conduit therebetween is ?lled with a 60
needed as only the bottom chambers (11, 13 when posi
(practically speaking) incompressible ?uid under such
tioned,
i.e., as shown) in cylinders 3, 9 need be intercon
pressure as is needed to position the reducing tube con
nected.
centrically within the combustion tube. The manner in
From the foregoing it will be understood that the pres
which fluid pressure is balanced and equalized between
ent invention is possessed of unique advantages. How
the cross connected and opposed chambers to maintain
coaxial alignment of the two tubes regardless of thermal 0 ever, such modi?cations and equivalents of the disclosed
concepts such as readily occur to those skilled in the art
expansion and contraction, can best be described with
' In reduction kilns, materials are heated in a reducing
atmosphere by con?ning the material within a tube that
is surrounded by a concentrically spaced outer combustion
tube. Fuel with the necessary oxygen containing air is
are intended to be included within the scope of this inven
tion and thus the scope of this invention is intended to
Referring to the drawing, there is shown a cross sec 70 be limited only by the scope of the claims such as are,
or may hereafter be, appended hereto.
tional view through a double concentric tube reducing
reference to the accompanying drawing which diagram
matically illustrates the present invention.
kiln 1 such as may be supported, rotated (as for example
Having now particularly described and ascertained the
3,098,509
a;
nature of my said invention and the manner in which it
is to be performed, I declare that what I claim is:
1. An expansion compensating support assembly com
prising ?rst and second cylinders, a piston in each of
said cylinders dividing’each cylinder into a pair of spaced
chambers, a rod connected to each piston with at least
a ?rst end of each such rod projecting outwardly from its
(it
there-from being hydraulically connected to the remote
chamber in said ?rst cylinder.
4. An expansion compensating support assembly com
prising ?rst and second ?uid operated motors each hav
ing a part comprising a cylinder and a part comprising
a piston in each of said cylinders with each piston divid
cylinder, said cylinders being positioned relative to each
ing each cylinder into a pair of spaced chambers, said
motors being positioned apart from each other to de?ne
other with said ?rst end portions of each rod projecting
from each cylinder in a facing spaced relation to each
cylinder converging toward each other and said space,
other for engaging and supporting a thermally expansible
body therebetween, each of said chambers being ?lled
with a hydraulic relatively incompressible ?uid, the cham
ber in said ?rst cylinder in close proximity to said ?rst
end of the rod projecting therefrom being hydraulically
connected to the remote chamber in said second cylinder,
and the chamber in said second cylinder in close prox
imity to said ?rstend of the rod projecting therefrom
being hydraulically connected to the remote chamber in
said ?rst cylinder.
2. An expansion compensating support assembly com
prising ?rst and second cylinders, a piston in each of
said cylinders dividing each cylinder into a pair of spaced
a space therebetween and with the central axis of each
said motors thus being spaced for engaging a thermally
expansible body therebetween with one part of each
motor, each of said chambers being ?lled with a hydrau
lic relatively incompressible ?uid, the chamber in said
?rst motor in close proximity to said space being hydrau
lically connected to the remote chamber in said second
motor, and the chamber in said second motor in close
proximity to said space. being hydraulically connected to
the remote chamber in said ?rst motor.
5. An expansion compensating support assembly com
prising ?rst and second ?uid operated motors each hav
ing a part comprising a cylinder and a part comprising
a piston in each of said cylinders with each piston divid
ing each cylinder into a pair of spaced chambers, said
chambers, a rod connected to each piston with at least
a ?rst end of each such rod projecting outwardly from 25 motors being positioned apart with one above the other
and with the central axis of each cylinder being vertical,
its cylinder, said cylinders being positioned with one above
said motors thus being spaced for engaging a thermally
the other end and with said ?rst end portions of each
expansible body therebetween with one part of each,
rod projecting vertically from each cylinder toward each
motor, the bottom chamber in each motor being ?lled
other and a facing and spaced relation to each other for
with a hydraulic relatively incompressible ?uid, and a
engaging and supporting a thermally expansible body
conduit connecting each of said bottom chambers to
therebetween, the bottom chamber in each cylinder being
equalize ?uid pressure therein.
?lled with a hydraulic relatively incompressible ?uid, and
6. In an assembly having an inner tube arranged co
a conduit connecting each of said bottom chambers to
axially within an outer tube, an expansion compensating
equalize ?uid pressure therein.
inner tube support assembly for maintaining the inner
3. In an assembly having an inner tube arranged co
tube coaxial with the outer tube regardless of expansion
axially within an outer tube, an expansion compensating
and contraction, said support comprising ?rst and second
inner tube support assembly for maintaining the inner
?uid operated motors each having a part comprising a
tube coaxial with the outer tube regardless of expansion
and contraction, said support comprising ?rst and second 40 radially extending cylinder secured to diametrically oppo
site locations on the outer tube, each motor also having
cylinders secured to diametrically opposite locations on
a part comprising. a piston in each of said cylinders di
the outer tube, a piston in each of said cylinders divid
viding each cylinder into a pair of spaced chambers, one
ing each cylinder into a pair of spaced chambers, a rod
of said parts of each said motor being secured to said
connected to each piston with at least a ?rst end of each
outer tube and the other part of each motor being secured
such rod projecting outwardly from its cylinder and radi 45 to said inner tube for supporting the inner tube within
ally inward of the outer tube for engaging and support
the outer tube, each of said chambers being ?lled with
ing the inner tube therebetween, each of said chambers
a hydraulic relatively incompressible ?uid, the chamber
being ?lled with a hydraulic relatively incompressible
in said ?rst motor in close proximity to the inner tube
?uid, the chamber in said ?rst cylinder in close proximity
being hydraulically connected to the remote chamber in
to the said ?rst end of the rod projecting therefrom being 50 said second motor, and the chamber in said second motor
in close proximity to the inner tube being hydraulically
hydraulically connected to the remote ‘chamber in said
connected to the remote chamber in said ?rst motor.
second cylinder, and the chamber in said second cylinder
in close proximity to said ?rst end of the rod projecting
No references cited.
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