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Патент USA US2124425

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July 19, 1~938II
l.. R. McAFoos
Filed may ~11, 19:57
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Patented- July 19,1938
Lawrence R. McAfoos, Pittsburgh, Pa., assìgnortc
Reliance Steel Products Company, Rankin, Pa.,
a corporation of Pennsylvania
Application May 11, 1937, Serial No. 141,907
2 claims.
This invention relates to furnace doors of the
type used in furnaces in which comparatively
high temperatures are encountered, and particu-
In the accompanying drawing illustrating a
present preferred embodiment of my invention:
Figure 1 is an elevation of a water-cooled
‘ larly to those furnaces which are employed in
furnace door; and
5 heating and melting metals. In furnaces used for
heating or melting metals, it isdesirable to control the inflow of atmospheric air both as to place
of ingress and as to quantity. Thus, it has been
found that it is very undesirable, in general, to
10 allow air to leak into the furnace around the
Ifurnace doors, as the effect on the heated metals
of unknown quantities of air cannot be foreseen
Figure 2 is a sectional view along the line II--II 5 l
of Figure 1.
In the drawing, there is shown a water-cooled
furnace door formed of rolled steel welded to- 1
gether at appropriate places and indicated gen
erally by the reference character 3. The door 10
consists of an outer plate 4 and an inner plate 5,
secured at its edges to the plate 4 by a weld 6.
and this leads to metallurgical difficulties and
loss of efficiency in the operation of the furnace.
The main portions y,of the plates are separated
from one another and secured at intermediate
points by appropriate stay bolts l. The plates 'l5
15 By preventing infiltration of air, it is possible to
better regulate combustion with a consequent fuel
saving and to better control the furnace operation
4 and 5 are shaped so as to provide between the
main panel portions a. main water space 8 and be
which gives a superior product. It is also of
importance that the heat of the furnace be con-
tween the edge portions a peripheral water space
9, which extends'around the periphery of the door
u 20 served and leakage of heated gases around the
edges of the furnace door prevented, as such leakage represents a direct heat loss, is injurious to
and projects beyond the main water space 8. The 20
plate 5 is shaped so as to provide a reentrant
space Ill, in which a refractory such as ñrebrick
the furnace structure, and increases rthe difli-
may be placed, if desired.
culties underwhich the workmen must labor. It
The outer plate 4 projects beyond the» inner ~
25 is thus apparent that it is of advantage that the
doors used in such furnaces be so designed and
constructed as to prevent gas leakage into and
out of the furnace.
In the commercial operation of furnaces, it has
30 been found difficult to keep a reasonably tight
plate 5 and has a lip ‘or sealing edge Il, which is 25
comparatively narrow and which projects in a
direction normal to the plane of the face of the
door. The sealing or wearing edge Il contacts
the’face of the furnace door frame' (not shown)
in which it` may be mounted when the door is in 30
seal between the furnace door and the furnace
position in the furnace. On account of the com-
door frame, and especially is this true after the
parative thinness of the wearing edge, it is a
door or door frame has been in use for a short
period of time.
simple matter to form a leak-proofl seal with the
door frame and should warpage occur, the sealing
edge will readily adapt itself to the contour of the 35 I
I provide a door which has a thin projecting
portion around the edges thereof, which projectlng portion contacts the furnace door frame. The
narrow edge will readily adjust itself tothe contour of the door frame and provide a comparali0 tively tight seal. If undue warping takes place
either in the door or frame, or in both, the door
can be removed and the projecting edges shaped
to provide a satisfactory seal between the door
door frame. If unusual warpage occurs, the edges
may be readily shaped as required by grinding or
machining, to insure a tight contactwith the flat
door face of the door frame. In the event that
the edge ll wears to a point where it is substan- 40
tially flush with the portion of the inner plate 5
nearest the furnace door frame, it is a very easy
matter to replace or restore the projecting edge by
welding an appropriate thin strip to the furnace
door. Indeed, the projecting lip or wearing edge 45
Il may, in the ñrst place, be formed by welding
an appropriate strip to the furnace door instead
of allowing the outer plate 4 to project, as shown'.
edge and the frame. The edge can be readily re-
45 newed should the occasion arise by welding an
appropriate strip around the edges of the door.
By this construction, the furnace door can be
made substantially gas-leak-proof, since it is
much easier to form and maintain a seal between
50 a narrow edge and a flat surface than between
two flat surfaces.
The _disadvantages due to
furnace door leakage can thus be avoided and`
A water inlet pipe. l2 extends into one leg of the
peripheral water space 9 to a point adjacent the 50
lower side of the door.
A discharge pipe I3 is.
also provided at the upper side of the door. The ‘
the working conditions of the Workmen and the use of such circulation pipes is familiar and any
operation of the furnace, and consequently, the desired arrangement of them may be adopted.
product, will be improved.
Y An opening I4 is provided through the door 2, 55
which opening is closed by means of a swinging
cover I5, in which the usual peep holes I6 are
formed. Lifting lugs I1 are secured to the upper
side of the door. '
While I have illustrated and described a pre
ferred embodiment of my invention, it Will be
understood that it is not limited thereto, but may
be otherwise embodied and practiced Within the
that the edge is in position to slidably move along
and to bear against a furnace door frame in which
the door may be mounted.
2. In a Water-cooled furnace door, an outer
plate and an inner plate, said plates enclosing a
main water `space and a peripheral Water space,
and a thin Wearing edge around the Whole periph
ery of the door projecting inwardly in a, direction
normal to the -plane of the `face» of ` the door
from a point on the door adjacent the peripheral 10
I claim:Y
1. A furnace door comprising a main panel por-> water. space, so that the edge is in position to
tion and a peripheral edge portion, said edge por
slidably move along and to bear against a frame
tion terminating inwardly in a comparatively. in which the door may be mounted.
thin wearing edge which projects in a direction
l5 normal to the plane of the face fof the door so
scope of the following claims.
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