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Патент USA US2122688

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July 5, 1938.
Filed 001;. 1'7. 1956
F151 .
‘ ‘
193s '
I ,Z,"1ZZ;68.8
nil-‘roses ‘I-‘o'n FLUID FUEL BUaNEns
' 7 Application
_ ‘moOctober
mu, sen
1936, Serial
No. 106,140.
' 1.0mm
(Cl. 158-15)
This invention relates" to diffusers for ?uid
manufacture, and to otherwise generally im
fuel burners and has particular reference to im-
prove upon known diffuser devices for ?uid fuel
provements in structural features of suchv dif-
fusers. These diffusers are also variously called ,.
5 de?ectors, diffusers, smelds'orjcones,‘ and their
purpose is to control the spread of ?ame at the
With the foregoing and other objects in view,
all of which will be more apparent as this de- 5
scription proceeds, the, invention is exempli?ed
discharge ori?ce of a ?uid fuel burner‘ so that‘ in one form in the novel construction herein
' the flame will be directed to a point in the' fur- ' after described, illustrated in the accompanying
nace where the heat will be most‘e?edtlvely em- ' drawing, and pointed out in the claims hereto
v1o ployed. In order that sufficient volume’of air- appended, ‘it being understood that various 10
may enter the shield or, diffuser 'to support'com- changes in the form, proportion, size and details
bustion at the burner nozzle,'ori?ces are providedin the diffuser or'shield. Conica?y‘shaped'
diffusers are well-known in this ‘art, but they
' 15 have had several principal shortcomings. Fir'st-
of construction of the apparatus may be re
sorted to within the scope of the appended claims without departing from the spirit or sac- ‘
ri?cing any of the advantages vof the invention. 15
ly, that the fuel is projected too great a distance i To more- clearly comprehend the invention,
into the‘ combustion chamber of the furnace be-' reference is directed to the accompanying draw
fore‘it spreads to the furnace walls, and sec-
ondly, lack of sufficient-supply of air to- sup;
20 port adequate combustion within the diffuser
has prevented the most e?icient utilization of
ing whereinz'
,Fig. 1 is a longitudinal vertical section of vthe
invention‘ mounted at a‘ furnace ‘opening or 20
throat through which fuel‘ is fed to the com
heat in the furnace; thirdly, due to egp'ansion
bustionchamber. ‘
and contraction'of'the diffuser walls under ac- v ' Fig. 2 is a rear view of the invention taken
tual operating service, the walls oi'the diffuser
2-5 crack'and break after a very short period of use.
This invention may be employed with either ‘the
rotating type of oil'bumer or the non-rotating
type wherein the liquid fuel under pressure is
from the right in Fig. 3.
Fig. 3 is a longitudinal vertical transverse sec- 25
tion on line III-—III of Fig. '2.
_ \
- l -
.Fig. 4 is a longitudinal vertical section ‘of a
modi?ed form of the'invention- ‘
atomized at some‘point in its line of
ThereFig-- 5 1S 8- ?‘ailmentary Segment of the mod-3i’
:30 fore, it is‘ to be’ understood that the invention ifled form of the invention shown in Fig. 4, en- 30
is not limited to a, particular type'o'f ?uid fuel Mla‘rged to show detail. of structure of ‘slots in thei
burner, but that the burner herelmdescribed and" adapter body,'the view ‘being from the outside.
illustrated is for illustrative purposes by way~of. ,, Referring to the drawing in which like char- 1
example of one form of use of the invention." - acters of reference indicate ‘corresponding parts
I have found by actual experiment and de'm-
in -the several views,‘_ to indicates generally a '35
onstration ‘that a, diffuser ‘is moreje?icient'and
lasts for a considerably longer
of time
burner housing of a suitabletype'of furnace in;
,which illsthe combustion chamberand l2 in-v
without "cracking or breaking under; actuallop- dicates the furnace opening'dr throat. ‘Suit-.
erating'serviceconditions if the 'wall thereof is , able doors‘ l3 ‘may be provided at the burner'nll
formed in the general shape of a bell, the wall housing for purposes of furnishing draft,.the 40
4O of which'in-longitudinal section has a compound
Y‘ ‘
opening of the doorsbeingadjustable' by a rack '
bar HLF-Asuitable burner member 'I5'of‘ any,‘
The objects of this invention ‘are to‘ ‘provide acceptable ‘ design éxtendsthrough an‘ opening"
an'improved diffuser for ?uid fuel burners which‘ it“ in the forward wall of the burnerwhousing ‘
will direct aeilame/from a'burner tip to the point‘ ' i0. ' For purposes of ‘illustrating one ex'ar'ripleiof 4,5
of‘ greatest combustion value in afurnace; to- use‘ of'l'the' invention, th'e'burner' member 15 is .1
provide a- diffuser for ?uid‘ fuel' burners which‘_ shown vas an ordinary pressure ,burnverlha'vin‘g a '
will be maintained at relatively low temperature
nozzle: I6, an, atomizer ‘I7. and a j hood, i8_ sur- i.
I. 7 adjacent the nozzle of the burner;- to' provide 'roun'cling the nozzle"v ‘tip. to prevent draft from, ' f
50' in a‘ burner for ?uid fuel, a diffuser for ac-
directly striking the discharge orifice of the non-a 50,
complishing the foregoing objects and which
will also cause the atomized fuel to whirl as it
leaves the burner nozzle; to Provide a diffuser
for fluid fuel burners which is e?lcient in oper-
zle £5. The burner member, as illustrated,_ex_-' '
tends longitudinally through an air conduit l9,
which removably mounts the diffuser 20, adja- ‘
cent the discharge end of the burner. The dif-'
55 ation, simple in structure and, economical to
fuser 28 comprises a hollow body, the inner face‘ 55
' 2
of which is substantially concentric relative to
the longitudinal axis of the diffuser;I but has
Thedirectionoftravel ofthe?ameisindi
cated by the dotted lines 3. in Pig. 1.
.Having thus described my invention, what I
claim and desire to secure by Letters Patent of
progressively increasing diameters ' from the
burner-receiving portion to the oppositeend ‘of
the diffuser, so that the wall of the diffuser in
the United States is:
transverse section through the longitudinal axis
of the diffuser is delineated by a compound
curve which is concave at the portion 2i adja
cent the mouth 22, ‘which would correspond to
10 the sound bow of a bell, the concavity of the
curve ?attening out at 28 and fading into a
convex curve 24 at the portion adjacent the
burner and'which would correspond to the shoul
der of a bell, the radius of the arc of the con
15 cave curve being greater than the radius‘ of the
said body wall in longitudinal section through the
axis of the diffuser having its inner-face deiin-:
eated by a compound curve in which the por
tion adjacent the said one end of the diffuser
body is concave and the portion adjacent the 15
arc of the convex curved portion. At the apex
25, or what would ‘correspond to the cannon of
a bell, a collar 26 is provided which ?ts circum
burner receiving opening is convex.
2. A'di?user for ?uid fuel vburners compris
ferentially around the conduit I9. to which it
may 'be ,releasably secured by set-screws 26',
whereby the di?‘user may be readily replaced, '
or may be longitudinally adjusted along the
conduit is to meet existing conditionsvof de
sired combustion within the furnace. In that
26 rearward portion of the body which is most near- 1 '
1y radial to the collar 28, the diffuser is'provided
with a plurality of circumferentially arranged
and relatively spaced openings 21. These open
ings 21 comprise aplurality of elongated slots
having their side edges correspondingiwithl the
outer and inner faces of the diffuser body' and
preferably have their end walls 28 substantially
- 2
portion adjacent the said .one ‘end of the dif
fuser body is concave and the portion adjacent
the burner receiving opening is convex, the ra
dius of the arc of the concavelyv curved portion
being greater than the radius of the arc of the’
convexedly curved portion, said body'having a
parallel with the axis thereof. This arrange ,
ment of the openings 2'! permits air from the plurality of relatively spaced-openings adjacent
the burner receiving opening.
' 3. A diffuser for ?uid fuel burners comprising
35 draft doors II to enter
cient to adequately support combustion is sup
plied within the di?'user. The draft of air thus
entering the diffuser also serves to keep the wall
0 of the diffuser relatively cool closely adjacent
the burner so that the life of the diffuser is pro
longed. As the air entering openings 21‘ mixes
with the atomized fuel it naturally becomes rap-'
idly and intensely heated so that it expands as
45 it reaches the mouth 22 of the diffuser and thus
it carries the ?ame along the outwardly-?aring
hollow body open at one end and having the 35
inner face of the body wall tapered inwardly
from the said one end toward its opposite end
through the axis of the diffuser having its inner
face delineated by'a compoundv cur-vein which
the portion adjacent the said one end" of the
diffuser body is
wall adjacent the mouth 22 of the di?'use , until
the ?ame reaches the edge of the mouth. At - radius of the arc‘ of the concavely, curved por
the mouth 22 the diffuser is in spaced relation tion‘ being greater than ‘the radius of the arc
to the throat l2 of the furnace as at 29. Through of the convexedly curved portion, said bodyhav
this space 29 additional air from the draft door ing a plurality of circumferentially arranged rel
it picks up the ?ame and carries it into the _ atively spaced openings adjacent the burner re
ceiving opening, the side walls within said open
furnace combustion chamber i I, but the air en
tering through the slots 21 having expanded due ings being inclined at an angle to the radius of '
“to the heat, the ?ame expands immediately upon
entering the combustion chamber of the furnace,
instead of'being projected a considerable dis
tance into the combustion chamber before it
expands. This increases the temperature of the
60 combustion chamber at the feed end and'there-v
by makes the fuel more emcient- and reduces the
the body.
In the modi?cation’ of Fig. 4. the elongated
slots 21. are radial \to the longitudinal axis of
the diffuser on the inner face thereof, but the
side walls 2'!- of the slots are angularly inclined
substantially 45° laterally to the inner face of
the diffuser so that the opening in the outer wall
is offset from the opening in the inner wall. By
70 such arrangement of the slots 21 the inrushing
draft tends to whirl the ?ame within the dif
concave and the portion adjacent the burner re
ceiving opening is convex, the radius of .the arc
of the concavely curved portion being
than the. radius
curved portion.
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