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Патент USA US2404903

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July 3% W450
T. A.
I
AUTGMATIC BURNER CONTROL AFPAHATUS
Filed Aug. 2:5, 19:25
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477400191
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2,404,903
Patented July 30, 1946
‘UNITED STATES PATENT OFFICE
2,404,903
AUTOMATIC BURNER CONTROL
APPARATUS
Theodore A. Cohen, Chicago, 111., assignor to
Wheelco Instruments Company, Chicago, 111.,
a corporation of Illinois
Application August 23, 1943, Serial No. 499,731
7 Claims.
(Cl. 158-28)
1
This invention relates to automatic burner
control apparatus of the type wherein a photo
electric cell ?ame supervisory device is used to
observe the presence of a burner ?ame and con
trol the fuel supply accordingly.
In the use of automatic burner control safety
apparatus of the above type one of the great
dangers has been that the furnace wall opposite
and within the scope of the sight of the photo
2
supervisory device 4, within the area of the coni
cal scope of sight boundary lines 5 and 5a, if above
a certain temperature may emit sufficient light
or heat rays, or both, which upon falling into the
photo-electric receiver 4 will cause said receiver
to maintain the switch 8 closed and the fuel valve
9 open even after the ?ame 3 may have been ex
tinguished accidentally or diminished below pre
determined safe condition at which the safety
apparatus is intended to cut off the fuel supply.
electric cell may be heated to such an extent as 10
By supplying a ?uid cooled target ll suitably
to give forth light or heat rays, or both, sufficient
fed by a circulatory system, such as hereinafter
to maintain fuel supply to the burner after the
described, arranged across the area of the coni
burner ?ame has been extinguished. An explo
cal scope of sight boundary lines 5 and Ed on the
sive condition would then result, due to entry of
wall of the furnace opposite to the receiver 4
15
raw fuel into the furnace chamber.
beyond the ?ame 3, said wall is thus blocked off
The primary object of this invention is ac
by said target and prevented from causing the
cordingly to provide means, in an automatic
afore-said erroneous operation and said target it
burner safety apparatus of the type referred to,
self being cooled by said system cannot accumu
for preventing the furnace wall within the scope
late suflicient heat to emit su?icient light or heat
of the sight of the photo-electric cell ?ame super 20 rays to cause erroneous operation of the photo
visory device from causing the said device to
electric receiver 4.
function as if ?ame were present at the burner
The target II is shown as continuously cooled
after said burner ?ame has ceased to exist.
by suitable means such as a water circulatory
Other and further objects of this invention will
system comprising spaced inlet and outlet pipes
become more apparent hereinafter as the same 2.5
12 and 13, the latter connected to a heat ex
becomes better understood from an examination
changer (e. g. condenser) 14 and thence to the
of the accompanying drawing wherein:
Fig. 1 of the drawing is a schematic and dia
grammatic view of an apparatus embodying this
invention;
Fig. 2 is a detail elevational view of a part of
the apparatus of Fig. 1.
Referring to the drawing more particularly ref
erence character I designates a furnace having a
burner 2 mounted in one wall thereof for supply- ;
ing a ?ame 3. A photo-cell burner flame super
visory device 4 is mounted in a side wall of the
furnace with its sight shown in dotted lines at 5
for observing the condition of ?ame 3. The out
put of the device 4 is connected to an electronic
apparatus 6 which may be of the type shown in
patent to W. H. Gille No. 2,231,420 of February
11, 1941, for Burner control apparatus or the type
shown in copending application, Ser. No. 451,651
of Theodore A. Cohen, for Burner control appa
ratus ?led July 20, 1942. The output of the elec
tronic apparatus 6 is connected to a relay ‘1 as in
said copending application for closing a switch 8
in the electric fuel valve circuit including electric
fuel valve 9.
This circuit is supplied from elec- '
tric line supply 10 and is closed when the burner
?ame 3 is on to open the valve 9 and permit the
burner to operate.
Without the means hereinafter described the
inlet of a water circulating pump l5. The de
livery side of pump 15 is connected through a
water ?ow switch 11 to inlet l2. The switch I‘!
is electrically connected in the electric fuel valve
circuit whereby when it is opened by absence of
water ?ow in the circulatory system for drum I l
the fuel valve 9 will close and shut down the
burner upon any failure of the circulatory cool
ing system for the target I l and thus additionally
safeguard the apparatus.
The operation and advantages of the afore-de
scribed apparatus in safeguarding the burner
?ame supervisory system to assure safe opera
tion of said system will be apparent without fur
ther detail.
I am aware that many changes may be made
without departing from the principles of this in
vention and I therefore do not wish to be limited
to the details shown or described.
I claim:
1. In an automatic burner control apparatus
comprising a furnace having a refractory lined
combustion chamber, a burner mounted in one
wall of the furnace with its axis directed between
a pair of adjacent side walls thereof, photo-elec
tric supervisory means mounted in one side wall
and arranged to observe the condition of the
flame
from said burner and having a predeter
55
heated furnace wall opposite the photo-cell ?ame
3
d.
mined sight, and a device on the other side wall
overlying a portion of the refractory lining of
said chamber presenting a cooled surface sub
stantially coextensive with the entire cross sec
tion of said sight on the side of the aXis of the
burner and said ?ame opposite to said supervising
?ame supervisory means in one wall of the fur
nace and provided with a predetermined sight,
a burner in an adjacent wall and having its axis
means.
2. In an apparatus of ‘the character described,
substantially parallel to the ?rst wall and adapted
to emit a ?ame, fuel supply means controlled by
said ?rst means in accordance with presence or
‘absence of burner ?ame, a member on a furnace
wa-ll opposite the ?rst Wall overlying a vportion of
the refractory lining of said chamber presenting
tory lined combustion chamber, ray sensitive 10 a surface arranged substantially coextensive with
burner ?ame supervisory means in one Wall of
the entire cross section of the sight of said ?rst
the furnace and provided with a predetermined
means on the other side of the axis of the burner
sight, a burner in an adjacent wall and having
and burner ?ame, and means for cooling said
its axis substantially parallel .to the ?rst wall
surface, said last means comprising said member,
and adapted to emit a ?ame, fuel supply means ‘
the same having an extended chamber and means
controlled by said ?rst means in accordance with
‘for circulating a‘ cooling ?uid through said cham
presence or absence of burner flame, and a mem
ber at sufficient rate to prevent incandescence
ber on a furnace wall opposite the ?rst wall over
of its outer surface.
lying a portion of the refractory lining of said
6. In an apparatus of the character described,
chamber presenting a cooled surface arranged
the combination of a furnace having a refractory
substantially coextensive with the entire cross
lined combustion chamber, ray sensitive burner
section of the sight ‘of said ?rst means on the
?ame supervisory means in one wall of the, fur
other side of the axis of the burner and burner
nace and provided with a predetermined sight,
?ame.
a burner in an adjacent wall and having its axis
3. In an apparatus of the character described, _
substantially parallel to the ?rst wall and adapted
the combination of a furnace ‘having a refractory
to emit a ?ame, fuel supply means controlled by
lined combustion chamber, ray sensitive burner
said ?rst means in accordance with presence or
?ame supervisory means in one wall of the fur
absence of burner ?ame, a member on a furnace
nace and provided with a predetermined sight,
wall opposite the ?rst wall overlying a portion
a burner in an adjacent wall and having its axis
Si) of the refractory lining of said chamber present~
substantially parallel to the ?rst wall and adapted
ing a surface arranged substantially coextensive
to emit a ?ame, fuel supply means controlled by
with the entire cross section of the sight of said
said ?rst means in accordance with presence or
first means on the other side of the axis of the
absence of burner ?ame, a member on a furnace
burner and burner ?ame, means for cooling said
wall opposite the first Wall overlying a portion of
surface, said last means comprising said mem
‘the refractory lining of said chamber presenting
her, the same having an extended chamber and
a surface arranged substantially coextensive with
means for circulating a cooling ?uid through said
the entire cross section of the sight of said ?rst
last chamber and means for additionally con
means on the other side of the ‘axis of the burner
trolling said fuel supply means by shutting the
and burner ?ame and means for cooling said
same Off in event of failure of the circulating
surface.
means.
4:. In an apparatus of the character described,
‘7. In an apparatus of the character described,
the combination of a furnace having a refractory
the combination of a furnace having a refractory
the combination of a furnace having a refrac
lined combustion chamber, ray sensitive burner
?ame supervisory means in one wall of the fur
nace and provided with a, predetermined sight, a
burner in an adjacent wall and having its axis
substantially parallel to the?rst wall and adapted
to emit a ?ame, fuel supply means controlled by
said ?rst means in accordance with presence or
absence of burner ?ame, a member on a furnace
wall opposite the first wall overlying a portion of
the refractory lining of said chamber presenting
a surface arranged substantially coextensive with
the entire cross section of the sight of .said ?rst
means on the other side of the axis of the burner
and burner ?ame, means for cooling said surface
and means providing supplemental control of the
fuel supply means for shutting off the latter in
event of failure of said cooling means.
.5. In an apparatus of the character described,
the combination of a furnace having a refractory
lined combustion chamber, ray sensitive burner
lined combustion chamber, ray sensitive burner
?ame supervisory means in one wall of the fur
nace and, a burner in an adjacent wall and hav
ing its axis substantially parallel to the ?rst wall
and adapted to emit a ?ame, fuel supply means
controlled by said ?rst means in accordance with
presence or absence of burner ?ame, a member
.on a furnace Wall opposite the ?rst Wall overlying
a portion of the refractory lining of said chamber
and presenting a surface arranged substantially
coextensive with the entire cross section of the
sight .of said ?rst means on the other side of the
axis of the burner and burner ?ame and means
for cooling said surface, said last means compris
ing said member, the same having an extended
chamber and means for circulating a cooling fluid
through said last chamber at suf?cient rate to
prevent incandescence of its outer surface.
THEODORE A. COHEN.'
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