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Патент USA US2125661

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Aug:- , 1%.
2,125,661‘
J. c. WOODSON ~
ANNEALING FURNACE 7
Filéd Oct. 7, 1937
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INVENTOR
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James C. Woadson
Aug. 2, 193%;
'
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’ J. c. wooDsoN
ANNEALING
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2,125,661
FURNAGE
' Filed 001:. 7, 1957
2 Sheets-Sheet 2
INVENTOR
James C‘. Woodson
WZMM
AWW
Patented Aug. 2, 1938
I.
,
, * ‘2,125,661
UNITED STATES PATENT OFFICE
ANNEALING FURNACE
'James C. Woodson, Cleveland, Ohio, assignor to
'
Lee Wilson ‘Sales Corporation, Cleveland, Ohio,
a corporation of Ohio
Application October ‘7, 1937, Serial No. $7,121
3 Claims. .(Cl. 263-42)‘
This invention relates .to annealing apparatus,
Figure 2 is a transverse sectional view taken
along the line II--II of Figure 1. Lines ‘Ia-Ia
and I“-—--Ib indicate, respectively, the planes ‘on
and-in particular to an annealing furnace of the
cover type, which is adapted to be lowered over
the material to be annealed and lifted therefrom
which the‘ sections at the left and right-hand
when the material has been heated to_ the desired
sides of Figure 1 are taken.
temperature.v '
Cover type annealing furnaces as constructed '
heretofore have consisted of an open-bottomed
refractory lined enclosure adapted to be lowered
'
5
Referring now indetail to ‘the drawings, the
apparatus of my invention comprises, generally,
a‘cover l0 and one or more charge supports II.
In the example shown, there are‘ eight charge‘
supports arranged in two parallel rows, as clear- 10
protective covershave beendisposed over the ma- f ly shown in the drawings. These supports are
m on a ‘refractory, covered ‘base or hearth. Inner
edges thereof cooperate with sand seals formed
carried 'on beams l2, disposed on a suitable
foundation l2“. Channels l3, extending between
adjacent beams l2, support a bottom plate M.
in the base or hearth.
An inner channel wall l5 extends around the bot- 15
terial.
These “inner covers are also ‘open-bot
> tomed enclosures oflight plate, and the lower
Such seals ,permit a
tom plate and is spaced slightlyinward of the
to the, space insidev the inner covers, but this edge of the latter, thereby cooperating 'with the
leakage is not important ordinarily because of channel H to support it. A central annular wall
the relatively low cost of the deoxidizing atmos- . It extends around a central opening I‘! in the
bottom plate I4. The’ wall I6 may be convenient,20 phere normally employed.
The present invention is an improvement on ly formed of a beam orother shape bent to the
proper curvature. A hearing plate 18 rests on the
' , the previous construction of cover type furnaces,
' whereby ?uid seals are provided for cooperation wall l6 andi'supports a motor IQ for driving a fan
with the inner covers. The invention makes it 2ll,'mounted on a shaft journaled in bearings suit
25 economical to employ more costly deoxidizing ' ably disposed on the plate l8. A charge support
gases than have been used heretofore with the ' proper, shown at..2l, rests on a pier 22 of refrac
tory material built up on‘ plate M. The charge
more desirable results accruing therefrom.
__
In accordance with the invention, I‘provide a support 2| .is adapted to receive a coil of strip
indicated at 23.
.
charge support or a plurality, thereof for oo
An inner protective cover 24 is adapted to be
30 operation with a cover which has a bottom wall,
as well as‘ the usual side walls and roof. The disposed over the charge 23. An outer sealing
bottom wall is provided with openings adapted channel wall 25 extends around the inner wall
to admit the charge supports with a slight l5 and is spaced outwardly therefrom to provide
clearance. Sealing channels are disposed around a sealing channel containing sealing ?uid indi35 the charge supports at a levelbelow that of the cated at 26. As shown, the lower edge of the
inner cover is seated in the channel formed by the
, bottom wall of the cover when the latter is dis
posed in cooperative relation with the charge walls i5 and 25 and an annular bottomplate 2L
supports. An inner protective cover has its lower The pier 22 is provided with ‘guards 28 in the form
of straps extending down over ‘the lateral faces
‘ edge seated in the sealing channel, the lower por
thereof in circumferentially spaced relation. In~
40‘Jtion of its side wall being disposed in the clear
let and exhaust pipes 29 and 30 for deoxidizing
ance space between the bottom wall of the fur
nace cover and the charge support. Since the gas extend upwardly through the beam 22.
slight leakage of the special atmosphere, supplied
' ‘ sealing channel is outside the enclosure de?ned by
‘ the furnace coverv and charge support, it is pro
45 tected from the intense heat within the enclosure.
Fluid sealing material may be thus employed. I
also provide means for cooling the ?uid sealing
material, in the‘channel.
‘
A complete understanding of the invention may‘
50 be obtained from the following detailed descrip
tion thereof which refers to the accompanying
drawings illustrating a present preferred embodi
- ment.
In the drawings:
Figure 1 is a longitudinal sectional view ‘show
55 ing the parts in elevation; and
20
25“
30
_
35
,
40
> The cover in includes side walls 3|, a roof 32,
and a bottom 'wall 33. The side walls and roof are
formed of refractory brick assembled within a 45
shell composed of frame members 34 and sheath
ing plates 35. A bottom wall 33 is similarly com
posed of refractory brick laid on a plate 36."
Beams 31 extend along the lower edges of the
covenbelow the plate 35 and are secured to frame 50
‘members 34 by gusset plates 38. In addition to
the beams ii‘ifextending along the sides and ends
' of the cover, intermediate beams 39 form there-,
with a lattice for supporting the bottom plate 14
‘of the cover.
When the cover is disposed over 55
2
2,125,661
.
the charges and their supports, the beams 31
and 39 rest on beams 40 extending transversel
of the beams l2.
,.
'
Opposite side walls 3| (preferably the longer
ones) are provided with ports 4| and 42 through
which heat exchange ‘tubes 43 extend into and
out of the space within the cover. Sealing chan
nels 44 extend ‘along the side walls -3| and em
brace the upper ends of the heat ‘exchange tubes
10 43 where they emerge from the side walls. A
burner 45 extends into the lower end of each
of the tubes 43 and is provided with an ignition
electrode 45. The latter is connected to a trans
former 41, whereby a spark gap between the
15 electrode and the burner may be created to ig-'
nite combustible gas issuing from the‘ burner.
Combustion of such gas occurs by the aid of at
mospheric air induced into the lower ends of the
nace cover, they are protected to a great extent
from the intense heat developed within the fur
nace cover. The clearance between the piers
22 and the holes in the bottom wall 33 is hardly
more than sufficient to accommodate the side
walls of the inner covers so that practically the
only heat which can reach the sealing ?uid is
that conducted thereto through the walls of the
inner covers. To absorb this heat, I provide cool
ing coils 69 in the ?uid seals which prevent 10
overheating of the ?uid. The bottom wall 33
protects the ?uid seals and the supporting struc
tural framework from substantially all direct
radiation from the interior of the furnace cover, .
despite the holes in the bottom wall, as the lat 15
ter are largely ?lled, when the cover is in posi
tion, by the piers 22.
It will be apparent from the foregoing descrip
tubes. The tubes 43 are preferably spaced uni
tion that the invention provides more e?'ective
20 formly along substantially the full length of the _ sealing of the space within the inner covers than 20
side walls 3|, although only a few such tubes are was attainable with the sand seals used here
indicated in Figure 1. Fuel gas is supplied to the tofore. As a result, it becomes economical to use
burners through valved connections 48 from more costly deoxidizing gases than have been
manifolds 49. Exhaust gases are discharged employed in the past. This is desirable for the
from the upper ends of the tubes 43 into mani
metallurgical effect upon the material being an 25
folds
50.
I
'
nealed.
'
In addition to the heat exchange tubes 43,
carried by the side walls 3|, I provide heat ex
change tubes 5|, extending inwardly from the
30 shorter side walls 3| and-upwardly through the
roof 32 at a point substantially centrally there
of. The heat exchange, tubes 5| are suspended
by stirrups 52, depending from the roof and carried on springs 53.‘ The lower ends of the stir
35 rups ?t into guide and supporting blocks 54.
The heat exchange tubes 5| and their manner
of mounting in the furnace cover are the sub
ject of my copending application Ser. No. 166,052,
?led September 28, 1937, for'Annealing furnace
40 and method.
The outer ends of the tubes 5| are provided
. with burners 55 and ignition electrodes 56.
The
burners aresupplied .from manifolds 51. The
upper ends of the tubes 5| are, provided with
45 seals 58 and- discharge into collector boxes 59.
Exhaust ducts 6|! lead from the boxes 59 to
downcomers 6|. The latter communicate with
the exhaust passages 62, but are separable there
from. A seal 53 closes the joint between the
50 downcomers and the passages. The manifolds
50, furthermore, communicate with the down
comers 6| by connections '64.
When the apparatus described above is to be
used for the annealing of material, the cover
56 HI is raised from its supporting beams 40 by any
convenient means, such as a crane. For this pur
pose, a yoke 65 extends between beams 66 se
cured'to the beams of the framework 34, which
extends longitudinally of the-roof. When the
cover III has been raised, charges, such as the
coils 23, are placed on the supports 2| and in~
ner covers 24 disposed thereover, as shown in the
It will be understood that the bottom
plates I4 are welded to the inner channel walls
l5 and that the bearing plates l8 are gas-tight
and are welded to the annular wall l6, whereby
the space under each inner cover is proof against 30
leakage of the gas contained therein when the
cover is in place with its bottom edge in the seal- _
ing channel.
1
While I have illustrated the invention as ap
plied to a furnace adapted to accommodate a
plurality of charges, it may also be embodied in
a furnace adapted to receive a single charge.
The latter modi?cation is ‘described and claimed
in my copending application Ser. No. 162,132,
?led September 2, 1937, for Coil annealing fur
nace.
.
Although I have illustrated and described but
a preferred embodiment of the invention, it will
be understood that changes therein may be made
without departing from the spirit thereof or the 45
scope of the appended claims.
'
,
I claim:
1. In apparatus for annealing a plurality of
charges, the combination with a plurality of
spaced, aligned bases each adapted to receive
50
and support a charge thereon, of a cover adapt
ed to be lowered over said bases to enclose said
charges, said cover including a bottom wall, side
walls and a roof, said bottom wall being provided
with spaced, aligned holes shaped and dimen
sioned‘to admit said bases.
2. In_annealing apparatus, the combination
with a'plurality of spaced bases each adapted to
receive and support a charge to be annealed, of
a heating cover disposable over said bases and 60
charges thereon, said cover having a bottom wall,
side walls and a roof, said bottom wall having
Deoxidizing gas is then supplied to
openings therein shaped and dimensioned to ‘ad
the. space inside the inner covers by the pipes
29 and 30‘. The cover In is then lowered over
the charges. Guide pins 61 on the base, cooper
ating with eyes 68 on ‘the cover,‘ facilitate this
operation. When the cover- I0 is in position, the
burners in the heat exchange tubes are ignited
and heat is radiated from the tubes to the cov
ers 24 and thence to the coils 23. The fans 20
facilitate the delivery of heat‘ from the walls of
mit said bases with clearance therearound, a seal
drawings.
the covers 24‘ to the coils 23.
'
Since the channels for the sealing ?uid 25 are
76 below the level of the bottom wall 31 of the fur
55
ing channel extending around each base, and 65
an open-bottomed protective cover disposed over
each base and extending downwardly through
said clearance into' said channel out of contact
with said base and heating cover,‘ and a ?xed
support for said heating cover extending a sub 70
stantial distance upwardly above said channel.
3. An annealing furnace comprising a bottom
wall, side walls and a roof, said furnace being dis
posable over a plurality of spaced bases each
adapted to support a charge of material to be
2,125,061
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33
annealed, said bottom wall having openings
substantially below the top thereof, and, an in-.
therein shaped and dimensioned to admit said
ner protective cover overlying eaeh'base, extend
bases with a slight clearance'extending around ' ing through said ‘clearance out of contact with
each base, and certain of said side walls being
provided with heat-radiating means, a sealing
channel extending around each base at a level
(said base and furnace‘and having its lower edge
‘seated in one of said channels.‘
JAMES C. WOODSON.
.
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