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Патент USA US2112063

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March 22, 1938.
.1t BUZARD
PEEP SIGHT FOR FURNAÈCES
Filed Aug. 7. 1956
ì y 2,112,063
Patented Mar. 22, 1938
2,112,063
‘y UNITE-D STATES lm'raN'rl OFFICE
2,112,063
PEEP SIGHT FOR FURNACES
John Blizard, Garden City, N. Y., assignor to
Foster Wheeler Corporation, New York, N. Y.,
a corporation of New York
‘
Application August 7, 1936, Serial No. 94,751 ' '
is ci.
My invention relates to furnaces, and an im
proved means for permitting observation of in
ternal furnace conditions, and the action of the
vburning gases on the refractory walls of a high
5 temperature furnace chamber,` and on any .tubes
or other devices disposed therein.
The invention is particularly applicable to
furnaces which are wholly or partially surround
ed by an air duct or air chamber, in which the
(ci. 126-190) '
Fig. 1 is a vertical sectional view of `a preferred
form of apparatus embodying the invention,
taken substantially on line I--I 'of Fig. 2;
Fig.A 2 is an elevation of the outer end of the
apparatus, as shown in Fig. 1; and
5
Fig. 3 is a transverse sectional view of the ap
paratus taken on line l:i3-_3 of Fig. 1.
Like reference characters refer to like parts
throughout the several views..
10 pressure is higher than that existing in the fur- I
Referring to the drawing, particularly Fig. l, 10
nace, and in which an aperture or peephole of reference character l0 designates the inner re
special design, comprising a sight tube and nozzle
member, opens to the atmosphere in the boiler
room or ñring isle and extends inwardly `there
15 from through the air duct and refractory' fur
>nace Wall to the furnace, whereby a clear vision
may be had into the furnace chamber whenever
desired, without discomfort or injury and with
out the use of any interposed transparent mate
'20 rial such as glass or mica.
In operation, such devices depend on the pres
sure differential existing between the air duct
and the furnace to create a flow of air from the
fractory lining of a furnace chamber having an
outer lining of suitable refractory material, while
I2 and I2' indicate the inner metallic casing
walls of an air duct or chamber I3 which may l5
entirely surround the furnace or may be disposed
on and exteriorly of, one or more walls thereof.
'I'he outer‘ wall is formed by heat insulating ma
terial designated I4 and outer metallic casing I5.
Suitable means are provided to maintain a pres- 20
sure in the air chamber which is higher `than the `
pressure in the furnace, or that yof the surround- 4
ing atmosphere.
-
-
The. peephole arrangement selected for illus
tration, includes a tapered sight tube I6 having N) 5
pend upon a Venturi shaped nozzle assembly and an inner end portion I6' and a laterally extending
diffuser to force the air from the air duct through annular ñange at its outer end. The inner end
the peephole into the furnace at the desired ve
of the sight tube extends into the throat or re
locity. Apparatus of the kind described is broad-` duced portion 25 of a nozzle member 23 which
30 ly disclosed in, and forms the subject matter of is secured by bolts 24 and 24’ to casing I2, and-30
the application of Hugh E. Carleton, Serial No. forms in combination with an enlarged furnace
89,287, filed July 7, 1936,` now Patent No.v opening 26, a Venturi shaped nozzle assembly and
2,105,309, granted January 11, 1938.
diffuser which is arranged and adapted to provide
air duct of sumcientA momentum to oppose any
~ 25 flow of gases from the furnace, and further de
The present invention constitutes an improve
35 ment thereon, and includes a _damper for shut
ting .olf the ñow of air from the air duct to the
furnace during the periods when visual access
to the furnace is not desired, which is highly
desirable from the standpoint of combustion.
40 Also, the ‘arrangement is such that the opening
when the peephole is in» use, the desired volume
and velocity of air ñow therethrough from the 35
air chamber to the furnace, and at the same time
to permit a wide range of vision within the fur
nace when the sight tube cover plate I'I is re
moved. If desired, the nozzle member 23 may
be arranged to extend entirely through the fur- 40
to the peephole in the boiler room or ñring isle nace wall, in which event a flared aperture in
cannot be opened for'use until after the damper the furnace wall may not be necessary. Cover
has been moved to the fully open position, thus « plate I'I, which opens to the boiler room or ñring
first establishing a ñow of air duct into the fur
isle, is secured to an intermediate portion of a
45 nace and preventing possible injury to the operat
latch I8 by a pin I9, and the latch is hinged at 45
ing personnel by an outward blast of furnace one end by pin 20 on spaced studs 20' extending
gases or preheated air, which would be'the result from the annular ñange on the sight tube I6.
if the order of the operation were reversed, due 'I'he other end of the latch I8 is provided with a
to the relatively high pressure existing in the air. slot I8’ which receives a swinging bolt 2| secured
l 50 duct and furnace chamber.
For a better understanding of the particular
.features that -characterize my invention, refer
ence may be had to the following description,
considered in connection with the accompanying
55 drawing forming a part thereof and in whichw
to'said annular flange. As shown in the drawing, 5_0
swinging bolt 2| also passes through a slot 3|'
in a' lever arm 3| forming. a part of the damper
means hereinafter described, and both the_lever
arm and the cover plate I1 are secured in closed
position by a wing nut 2|’ `threaded on the bolt 2|. 55
2
8,118,068
.
'I'he lsight tube I8 is supported on the outer wall
of the air chamber by means of the annular
flange thereon and by bolts 22 that pass through
the ñange and the outer wall.
Reference character 21 designates a thin, gen
erally triangular or segmental shaped metal disc,
or damper, fixed to squareddlportion 84 of an
operating shaft 28 by washers 35 and nuts Il
and 31. The cylindrical inner end 20 of shaft
28 is supported by bearing block 38 and rotates
therein. while the outer end Iii passes through
the annular flanged portion of sight tube IB and
is supported thereby for rotation in gland 40.
Air leakage through the gland is prevented by
15 packing 39. The lever arm 3i is iixed to operat
ing shaft 28 by cap screw 33 and is operated by
handle 32. The damper 21 is received by a nar
row transverse slot or groove 42 disposed in the
nozzle member 23 inwardly of the inner end I6'
20 of sight tube I 6, and is adapted for a limited ro
tary movement therein when operated by _shaft
28 and lever arm 3|.
An orifice 4| in damper
ber movable transversely of the axis of the nozzle
member.
2. In a furnace wholly or partially surrounded
by an air chamber, a peephole assembly compris
ing a nozzle member extending between the air
chamber and the furnace, a sight tube extending
through the wall of the air chamber inwardly to
the throat of the nozzle member, and a damper
for the nozzle member disposed inwardly of the
furnace _end of said sight tube for controlling the
iiow of air through the nozzle member from said
air chamber to the furnace.
' .
3. In a furnace having an air chamber out
side at least one wall thereof, means for observ
ing combustion and internal furnace conditions
therein, comprising a nozzle member for con
ducting air from the air chamber to the furnace.
a sight tube extending through the outer wall
of the air chamber and cooperating with lthe
nozzle member, a cover for the outer end of the 20
sight tube, and a damper for the nozzle member
operable independently of _the sight tube and its
21 corresponds substantially in diameter to the
cover.
diameter of the throat of the nozzle member.
4. In a furnace having an air chamber out
side at least one wail thereof, means for observ 25'
ing combustion and internal furnace conditions-
25 The arrangement is such that by rotating the
damper through a relatively small arc or range,
transversely to the axis of the nozzle member,
either the ñow of air to the furnace can be en
tirely cut off, or the orifice 4I can be brought in
30 axial alignment or register with the throat of the
nozzle member, and a flow of air established from
the air duct to the furnace. When .in the fully
open position, as indicated by position A of the
damper in Fig. 2 of the drawing, stop nut 43 on
35 damper 21 is in contact with the outer wall of
the nozzle member, thereby preventing movement
of the damper beyond fully open position.
As illustrated in the drawing, the damper is
closed, and all flow from the air duct to the fur-f
therein, comprising a 'nozzle member Yfor con
ducting air from the air‘chamber to the furnace,
a sight tube extending through the outer wall of
the air chamber and cooperating with the nozzle 30
member, a cover for the outer end of the sight
tube, a damper for the nozzle member, and means
independent of the sight tube and its cover "or
operating the damper, said damper operating
means being disposed so as to prevent movement 35
of the sight tube cover to open pojt‘un when the
damper is in closed position.
5. In a furnace having an air chamber out
side at least one wall thereof, means for observ
40 nace is cut oil'; both the lever arm 3i and cover ' ing combustion and internal furnace conditions 40
plate I1 of the sight tube are securely held in
closed position by, latch I 8, swinging bolt 2| and
wing nut 2|’ threaded thereon. ,When it is de
sired to use the peephole, wing nut 2l' is loosened
45 and the lever arm 3| is moved upwardly to the
right, as shown by dot and dash lines in Fig. 2,
until further movement is prevented by the stop
nut 43, in which position the lever will be clear
of the cover plate. 'I'he bolt 2| is then swung
50 free of the latch i8, and the latch and the cover
plate are swung downwardly away from the outer
end of the sight tube, thus permitting a clear
vision through the peephole to the furnace with
out discomfort or risk of injury due to a sudden
55 blast of hot air or furnace gases. When it is no
plonger desired to use the peephole, the damper is
moved to closed position and the several parts
associated therewith are returned to the posi
60
tions shown in the drawing.
.
Itis to be understood that changes may be made
in the form and structure of the apparatus herein
described and disclosed, without departing from
the principles of the invention which is not to be
limited except by the scope of the appended claims.
65
What I claim is:
1. In a furnace having an air chamber outside
at least one wall thereof, means for observing
combustion and internal furnace conditions com
70 prising a sight tube, a nozzle member arranged
to conduct air from -the air chamber to the fur
therein, comprising a nozzle member for con
ducting air from the air chamber to the furnace,
a sight tube extending through the outer wall of
the air chamber and cooperating with the nozzle
member, a cover for the outer end of the sight
tube, a damper for the nozzle member, means in
dependent of the sight tube and its cover for
operating the. damper, and single means for v
securing the damper and said cover in closed
position.
50
6. In a furnace having an air chamber out
side at least one wall thereof, a peephole for ob
serving internal furnace conditions comprising
a nozzle member supported by the furnace wall,
a sight tube extending through the wail of the 55
air chamber and disposed in axial alignment with
the nozzle member, a cover plate for the outer
end of said sight tube, and a damper for saidv
nozzle member movable transversely of the axis
of said nozzle member for controlling the flow of 60
air therethrough, and common means for secur
ing said cover plate and said damper in closed
position.
.
-
'1. In a furnace having an air chamber outside
at least one wall thereof, a peephole for observ 65
ing internal furnace conditions comprising a noz
zle member arranged to conduct air from the air
chamber to the furnace, a sight tube in axial
augment with the nozzle member, a cover plate
for the outer end of said sight tube, a damper for 70
said nozzle member disposed inwardly of the fur
nace and cooperating with the sight tube in such ’ nace end of said sight tube, and common means
manner as to permit observation of the furnace
interior through the sight tube and nozzlelmem
ber, and a shut-off damper for the nozzle mem
for securing said cover plate and damper in
closed position.
8. In a furnace having an air chamber outside 75
3
~ anaoea
' at least one wall thereof, a peephole for observing
internal furnace conditions comprising a nozzle
member arrangedy to conduct air from the air
chamber to the furnace, a sight tuberextending
through the wall of the `air chamber to the
arranged and disposed so as to prevent the op
ening of said cover plate before said damper
has been rotated to the fully open position.
11. In a furnace having an air chamber outside
at least one wall thereof, a peephole for observ
throat of the nozzle member, a cover plate for ing internal furnace conditions comprising a noz
closing said sight tube, a damper for said nozzle zle member arranged to conduct air from the air
member movable transversely of the axis thereof chamber to the furnace. a sight tube extending
for controlling the flow of air therethrough, a through the wall of the air chamber to the throat
10 lever for opening and closing said damper, and of _said nozzle member, a cover plate for closing 10
common means for securing both the damper and said sight tube, a damper for the nozzle member
cover plate in closed position, the arrangement disposed inwardly of the furnace end of -said
" v being such as to prevent the opening of said cover sight tube, a shaft extending through the wall of
`plate when said damper is closed.
l ' the air chamber and operably connected to the
9. In a furnace having an air chamber outside y damper, an operating lever ñxed to the shaft at 15
16
its outer end and arranged lto overlap said cover4
at least one wall thereof, a peephole -for observ
plate, and common means for securing’the lever
ing internal furnace conditions comprising a noz
zle member arranged to conduct air from the air and cover plate in closed position,- the arrange
chamber to the furnace, a sight tube extending ment being such that said cover plate cannot be
20 through the wall of the air chamber to the throat removed from said sight tube until the damper 20
` of the nozzle member, a cover plate for closing ‘ is moved to a position inv which the nozzle mem
said sight tube, a damper for said nozzle member, ber is open.
l2. In a furnace having an air duct outside at
an oriñce in the damper, and means for rotating
least one wall thereof, means for observing com
said damper transversely of the axis of said noz
25 zle member whereby the oriñce is moved into or bustion and internal furnace conditions- compris 25
ing a nozzle in a wall of the furnace, a sight tube
out of alignment with the nozzle member, there
by permitting or preventing~ ilow of air through extending through the wall of the air duct and .
the nozzle member from said air chamber to the
so
furnace.
l
`
10. In a furnace having an air chamber outside
at least one wall thereof, a peephole for observing
internal furnace conditions comprising ya nozzle
memberïarranged to conduct_ air »- from the air
chamber to the furnace, a sight tube extending
.35 through the wall of the air chamber to the throat
of the nozzle member, a cover plate for closing the
sight tube, a damper for said nozzle member dis
posed inwardly of the furnace end of said sight
tube. an orifice in the damper having a flow area
40 substantially equal to the ilow area of the-throat
of the nozzle member, means for rotating said
damper through a limited arc to open or close
said nozzle member, and common means for se
curing the cover plate and damper in closed posi
tion, said means for rotating the damper being
having its inner end so disposed with respect to
the nozzle that ñuid ~ ñow through the latter
causes air flow inwardly through the tube, and
a shut off damper for the nozzle member movable
transversely of the axis of the nozzle member.
13. In a furnace having an air duct outside at
30v
least one wall thereof, means for observing com
35
ing a nozzle in a wall of the furnace, a sight tube `
bustion and internal furnace conditions compris
extending through the wall of the air duct and
having its' inner end so disposed with respect to
the nozzle that fluid flow through the latter
causes air flow inwardly through the tube, and a 40
damper for the nozzle member disposed inwardly
of the furnace end of said sight tube for con
trolling the flow of air through the nozzle mem
ber from said air chamber to the furnace.
JOHN BLI `
,
45
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