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Патент USA US3039417

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June 19, 1962.
3,039,407
E. L. DAMAN
CLOSURE MEANS FOR PRESSURIZED FURNACES
3 Sheets-Sheet 1
Filed Aug. 1, 1957
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ERNEST L. DAMAN
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5Y0.
A'ITORNEY
June 19, 1962
E. L, DAMAN
I
3,039,407
CLOSURE MEANS FOR PRESSURIZED FURNACES A
Filed Aug. 1, 1957
5 Sheets-Sheet 5
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INVENTOR
ERNEST I... DAMAN
ATTORNEY
United States Patent 9 "ice
1
3,039,407
Patented June 19, 1962
2
invention is illustrated, a door assembly, generally desig
3,039,407
CLOSURE MEANS FOR PRESSURIZED FURNACES
Ernest L. Daman, West?eld, N .J., assignor to Foster
Wheeler Corporation, New York, N.Y., a corporation
of New York
Filed Aug. 1, 1957, Ser. No. 675,774
5 ‘Claims. (Cl. 110-179)
This invention relates to closure means for pressurized
nated by the numeral 12, comprises a door frame 14
which is adapted for mounting on a vertical outer casing
15 (partly shown) disposed on an insulated wall 16 of
a furnace (not shown). Disposed on the side of door
frame 14, toward the furnace interior, is a manifold 18
(FIG. 3) which includes a pair of concentric annular
members 26 and 22, and said members abut an annular
plate 24, extending transversely thereof, to de?ne a mani
furnaces and more particularly to a door assembly for an 10 fold chamber 26. A sleeve 27 is secured normal to plate
24 and disposed in an opening 28 of wall 16; the sleeve
access opening in a pressurized furnace.
and opening constitute an access opening 29. The inner
During the operation of pressurized furnaces, access
surface of wall 16 is lined with a sheet 30 and arranged
is required to the interior of the furnace for cleaning and
in front of the latter are ?uid conducting tubes 31. A
other purposes. To this end, an access opening is pro
vided in the wall of the furnace and is sealed from the 15 plurality of holes or ports 32 are drilled in plate 24 and
are arranged in a circular row, preferably at equal cir
exterior thereof by a door. The pressure within the fur
cumferential distances. Holes 32 are provided for in
nace is greater than that outside so that opening of the
jecting a gaseous medium under pressure, as for example
door while the furnace is in operation gives rise to a
air, into access opening 29 in a direction away ‘from door
dangerous condition wherein hot products of combustion
escape through the access opening. In order to over 20 frame 14. The high pressure air is supplied to manifold
chamber 26 ‘via a connecting chamber 34 (FIG. 4) which
come this condition, the prior art has disclosed numerous
communicates with chamber 26 through an opening 36
arrangements for injecting a fluid into the access opening
in annular member 22. An elbow coupling member 37
and toward the interior of the furnace to restrict or repel
is mounted in frame 14 and communicates connecting
the outward rush of combustion gases, together with
means for initiating the ?ow of injected ?uid prior to 25 chamber 34 with a source of high pressure air (not
shown) through a conduit 38 connected thereto. The
operation of the door from a closed position to an open
air injected into access opening 29 through ports 32 pro
position. In some instances, a mechanical interlock is
vides a ?uid barrier to the flow of combustion gases to
provided between the door and a valve which controls
ward the door frame 14.
the injection of ?uid into the access opening, to prevent
One end of annular member 20 extends into an open
opening of the door unless the valve is actuated initially. 30
ing 40 formed in frame 14. A sealing ring 41 is dis
Furthermore, it has been proposed to utilize an arrange
posed in a recessed portion of frame 14, which encom
ment wherein the door is maintained in a closed posi
passes the opening 40, and the ring is adapted to be
tion if the pressure in a fluid manifold associated with the
engaged by a door 42 for sealing access opening 29 from
door does not reach a certain value.
It is an object of the present invention to provide a 35 the outside of the furnace. A transparent member or
window 43 is provided in door 42 and is mounted in a
novel door assembly for access openings in pressurized
resilient insert 44 in a recess formed in door 42. Insert
furnaces which insures the flow of ?uid into the access
44 is engaged by a retainer member 47 which is secured
opening prior to the operation of the door to an open
to door 42 by a plurality of threaded members 48. Dia
position.
v
The present invention contemplates a novel door as 40 metrically opposed lugs 49 are provided on and adjacent
the outer edge of door 42 and each lug has an opening to
sembly which includes a manifold for injecting ?uid into
accommodate a stud 50. The studs 50 extend through
the access opening. Manually operable locking means
are provided for preventing operation of the door except
openings formed in a lifting ring 51 and opposite ends of
the studs are provided with limiting pins 53 to secure the
opening. Restraining means cooperate with the locking 45 door 42 to ring 51. A pair of hinge members or ears 55
are secured at corresponding ends to lifting ring 51 and
means to prevent operation of the latter when ?ow of
the other ends of the hinge members are provided with
?uid through the manifold is non-existent and permits
openings to receive a hinge pin 56 which is journalled in
operation of the locking means upon ?ow from the mani
a hinge block 58 secured to frame 14.
fold to the access opening.
A latch bar 60 is secured, as by welding, to lifting ring
The above objects and other advantages of the present 50
51 and is provided adjacent the ring with an upstanding
invention will appear more clearly from the following
hand-gripping handle '61. Latch bar 60 has a depression
detailed description of the invention when taken in con
62 (FIG. 3) which is engaged by one end of a threaded
nection with the accompanying drawings in which one
clamping member 63, the threaded portion of said mem
embodiment of the present invention is illustrated.
In the drawings:
55 ber cooperating with the threaded portion of a latch
yoke 64. Latch 64 is substantially U-shaped and is
FIG. 1 is a front elevational view of the door assembly
adapted for pivotal movement on a pin 65 which extends
of the present invention;
a
through both arms of the yoke adjacent the lower por
FIG. 2 is a side view and partly in section taken along
tions thereof. The opposite ends of the pin 65 are
the line 2-—2 of FIG. 1;
FIG. 3 is a sectional view taken along the line 3—3 60 mounted for rotation in bearing blocks 66 secured to
frame 14.
of FIG. 1;
'
Considering the structure thus far described, when air
FIG. 4 is a sectional view of a ‘portion of the door
is injected through ports 32 and it is desired to displace
assembly taken along line 4—4 of FIG. 1;
door 42 to an open position, as shown in broken lines
FIG. 5 is a partly diagrammatic representation of the
door assembly of FIG. 1 and more clearly discloses the 65 in FIG. 3, a ?nger-gripping portion 67 of clamping mem
ber 63 is rotated in the proper direction to elevate the
control for and means for introducing fluid to the mani
lower end of said member out of recess 62 and above
fold of FIGS. 2 and 3; and
the upper surface of latch bar 60, as seen in FIG. 3.
FIG. 6 is an enlarged view showing the detailed con
The operator then pivotally displaces yoke 64 to the
struction of ori?ce means associated with the conduit of
FIG. 4.
70 broken line position shown in FIG. 3 and thereafter
handle 61 is vgrasped to swing door 42 away from door
Referring now to the drawings and more particularly
frame 14.
to FIG. 1 thereof wherein one embodiment of the present
upon the passage of fluid from the manifold to the access
3,039,407
-
As indicated hereinbefore, the ?uid supplied to the
access opening through the ports in the manifold is
utilized to prevent escape of combustion gas known as
“flash-backs” which is dangerous to operating personnel
4
seen in FIG. 1) out of recess 75 in yoke 64. Yoke 64
is now unrestrained for movement to the broken line
position shown in FIG. 3 and the operator rotates por
and such “?ash-backs” occur in view of the greater pres
sure in the furnace as compared with that outside. In
some arrangements of this general type, injury to per
tion 67 of clamp 63 in the proper direction to elevate
the lower end of the clamp above depression 62 in latch
bar 60. Yoke 64 then is pivoted out of the path of
movement of latch 60 whereby the operator may grasp
sonnel has occurred because of failure of the supply of
handle 61 to swing door 42 outwardly and away from
?uid to the manifold, or clogging of the manifold ports
door frame 14. If it is assumed, in the foregoing de
to provide insufficient ?uid to the access opening. The 10 scription of operation, that an operator inadvertently
neglects to actuate valve 9-1 to the proper position and/ or
present invention provides means which prevent operation
manifold ports 32 are clogged so that no ?uid passes
of the door unless a su?icient amount of ?uid is ?owing
through. the manifold ports.
To this end, a motion re
therethrough, the operator is unable to open door 4-2.
The reasons for the inability of the operator to open door
straining member or locking pin 70 is adapted for slid
ing movement within a guide tube 72 securely mounted 15 42 is that no ?uid ?ows through ori?ce means 86, where
by the pressures upstream and downstream of the latter
on a support bracket 73 fastened to frame 14. One
are equal. Consequently, piston rod '7 6 is in engagement
end of locking pin 70 is ‘adapted to enter an opening 75
with locking pin 78 and the end of the latter remains in
(FIG. 1) in yoke 64 when the latter is in the full line
recess ‘75 of yoke 64. When the operator attempts to
position shown in FIGS. 1 to 3. The other end of lock
ing pin 71} is positioned for engagement with one end of 20 displace yoke 64 to the broken line position shown in
FIG. 3, it will be discovered that locking pin 75 still en
a piston rod 76 which projects outside of a ?uid op
gages yoke 64 and, therefore, the reasons for this condi
erated cylinder 77 secured to a bracket 78 by a threaded
tion will be brought to his attention.
nut 79. A piston 86 is disposed in cylinder 77 and is
In actual practice, it is assumed that if a certain num
biased by resilient means, as for example a spring 81,
toward the locking pin 70. Cylinder 77 has a pair of 25 ber of ports 32 are clogged, as for example 25 percent,
the amount of air injected by the latter will be insufficient
inlets '82 and 83 disposed on either side of piston 80
to prevent ?ash-backs from occurring when door 42 is
and such inlets communicate with spaced points in con
opened. Consequently, spring 81 in ?uid operated cylin
duit 38 by way of pressure lines 84 and 85, respectively.
der 77 may be calibrated to provide a force su?icient to
Disposed in conduit 38 between the last-mentioned points
is ori?ce means 86 complising a disc ‘87 (FIG. 6) having 30 overcome the forces exerted by the pressure upstream of
ori?ce means 86, if a number of ports 32 greater than 25
an opening 88 therein. In actual manufacture, conduit
percent are clogged. In the claims that follow this de
38 is separated in two portions, as shown in FIG. 6,
scription, the de?nition of the invention is not to be lim
at the point Where ori?ce disc 87 is located. The ends
ited to conditions wherein only all of ports 32 are clogged
of separated portions of conduits 38 are threaded and
cooperate with threaded unions 39‘ which in turn are 35 but also to the number of clogged ports which provide
less than the suf?cient amount of ?uid to prevent ?ash
brought together in tight relationship by a ?tting ring
backs.
90. The direction of flow of ?uid through conduit 38 is
shown by the arrows in FIGS. 5 and 6.
Although one embodiment of the invention has been
illustrated and described in detail, it is to be expressly
When ?ow of ?uid exists in conduit 38 for delivery to
manifold chamber 26 and through ports 32, the pressure 40 understood that the invention is not limited thereto.
Various changes can be made in the arrangement of parts
of the ?uid upstream of ori?ce means 86 is greater than
‘without departing from the spirit and scope of the inven
the pressure of such ?uid downstream of the ori?ce
means.
Such pressures are communicated to the oppo
tion as the same will now be understood by those skilled
in the art.
site sides of piston 80 through lines 84 and 85 and the
What is claimed is:
pressure of the ?uid entering inlet 82 of cylinder 77 is 45
1. In combination with a pressurized vessel having a
suf?cient to overcome the forces exerted by spring 81
shell which de?nes an access opening in communication
and the pressure entering the cylinder through inlet 83.
with the interior of the vessel, a door movable relative
As a result, the projecting end of piston rod 76 is dis
the shell between a closed position wherein the door is
placed in a direction away from locking pin 70. Con
disposed in sealing engagement with the access opening
versely, when no ?ow of ?uid to conduit 38 exists because
and an open position wherein the door is spacially dis
of failure of supply to such conduit or in the event of
posed relative the opening to permit entry into the vessel,
clogging of ports 32, the pressures upstream and down
latch means operatively arranged between the vessel and
stream of ori?ce means 36 are substantially equal. No
the door and movable between an engaged setting where
differential pressure is re?ected to cylinder 77, whereby
in it secures the door to the vessel in the closed position
piston 80 remains in the position shown in FIG. 2 with
and a disengaged setting wherein it permits movement of
the projecting end of piston rod 76 engaging locking pin
70.
the door between its open and closed positions, ?uid in
In operation, when the door 42 is in a closed position,
jecting means for directing ?uid under pressure into the
as shown in FIGS. 1, 2 and 3, and an operator desires
to displace door 42 to an open position for access to
opening 30, a valve 91 (FIG. 5) in conduit 38 between
ori?ce means 86 and a source of ?uid, as for example air
vessel to form a ?uid screen preventing escape of gas
from the vessel through the opening, conduit means
communicating the ?uid injecting means with a supply of
pressurized ?uid, control means responsive to the rate of
(not shown), is actuated to admit air through conduit 38.
?ow of ?uid through the conduit means and connected
The air flows through ori?ce means 86 and through
to the latch means for maintaining the latch means in its
coupling 37 for entry into manifold chamber 26, where 65 engaged setting when the rate of ?ow of ?uid is less than
it is discharged for injection into access opening 29
a set minimum rate, the control means comprising a ?ow
through ports 32. At the same time, the pressure of the
obstruction connected in ?ow series with the conduit
?uid upstream and downstream of ori?ce means 86 sub
means between the supply of pressurized ?uid and the
ject piston 80 to a differential pressure suf?cient to over
?uid injecting means whereby the pressure drop across
come the bias of spring 81 in cylinder 77 to move piston 70 the ?ow obstruction is a direct function of the rate of
80 to the left (as shown in FIG. 3), thereby disengaging
?ow of ?uid through the conduit means, a motion re
the projecting end of piston rod 76 from locking pin 70.
straining member comprising a movable element having
Since the door assembly 12 is disposed in a vertical posi
a disengagement side and an engagement side and mov
tion, locking pin 70 is moved downwardly by air pres
able in response to a difference in pressures therebetween
sure differential and gravity to bring the upper end (as 75 to move the latch means between its engaged and dis
3,039,407
5
engaged settings, a disengagement signal means com
municating the disengagement side with the pressure of
?uid in the conduit means u pstream of the flow obstruc
tion, an engagement signal means communicating the en
gagement side with the pressure of ?uid in the conduit
means downstream of the flow obstruction so that the
movable element registers the pressure drop occasioned
by flow past the ?ow obstruction.
6
pressure therebetween, the movable hydraulic element
connected to and aligned with the latch to move the latch
between its engaged and disengaged settings, a disengage
ment signal means communicating the disengagement
side with the pressure of ?uid in the conduit upstream
of the ?ow obstruction, an engagement signal means com
municating the engagement side with the pressure of
?uid in the conduit downstream of the ?ow obstruction
so that the movable hydraulic element registers the pres
2. The combination set forth in claim 1 with the ?ow
obstruction means comprising a restricted ori?ce.
10 sure drop occasioned by ?ow past the ?ow obstruction, a
resilient thrust element connected to the movable element
3. In combination with a pressurized vessel having a
and oriented to urge the latch into its engaged setting.
shell which de?nes :an access opening in communication
4. The combination set forth in claim 3 with the ?ow
with the interior of the vessel, a door movable relative
obstruction comprising a restricted ori?ce whereby when
the shell between a closed position wherein the door is
disposed in sealing engagement with the access opening 15 the ?uid is passed through the ori?ce above a minimum
rate the diiferential pressure across the movable hydraulic
and an open position wherein the door is spacially dis
posed relative the opening to permit entry into the vessel,
element overcomes the resilient thrust element to move
a latch operatively arranged between the vessel and the
door and movable between an engaged setting wherein it
secures the door to the vessel in closed position and a
the latch into its disengaged setting to permit movement
of the door out of its closed position and whereby when
?ow through the conduit is below the minimum rate the
disengaged setting wherein it permits movement of the
resilient thrust element overcomes the pressure differen
door between its closed position and its open position, a
manifold mounted about the access opening, the manifold
tial acting on the disengagement side of the movable
hydraulic element to maintain the latch in its engaged
position so that the door cannot be moved from its closed
de?ning a plurality of ?uid injecting ports arranged to
direct ?uid under pressure into the vessel to form a ?uid 25
screen preventing escape of gas from the vessel through
position.
'
5. The combination set forth in claim 4 with the mo- ,
tion restraining member comprising a piston housing, a
piston openatively disposed in the housing, the piston co
acting with the housing to de?ne the disengagement side
to the rate of ?ow of ?uid through the conduit and con
nected to the latch for maintaining the latch in its en 30 and the engagement side, a piston rod connected to the
piston and penetrating out of the piston housing on the
gaged setting when the rate of ?ow of ?uid is less than
a minimum rate, the control means comprising a ?ow
disengagement side to connect with the latch.
obstruction connected in ?ow series with the conduit be
References Cited in the ?le of this patent
tween the supply of pressurized ?uid and the ?uid ‘inject
ing ports whereby the pressure drop across the ?ow ob 35
UNITED STATES PATENTS
' the opening, a conduit communicating the manifold with
a supply of pressurized ?uid, control means responsive
struction is a direct function of the rate of ?ow of
?uid through the conduit, a motion restraining member
comprising a movable hydraulic element aligned to move
the latch and having a disengagement side and an engage
ment side and movable in response to a difference in
2,296,255
2,545,886
2,775,216
2,823,629
Bloom ______________ ..
Kooistra ____________ __
Alexe? et a1. ________ __
Wittke ______________ __
Sept.
Mar.
Dec.
Feb.
27,
20,
25,
18,
1942
1951
1956
1958
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