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Патент USA US2117881

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May 17, 1938.
»
4
E. E_¿OÈHLER'
2,117,881
FUEL on. BURNER
Filed Nov. 9, 193s
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2,117,881 _
Patented May 17, 1938 `
PATENT oFElcE
UNITED STATES
2,111,881
_
FUEL OIL BURNER
_ Elmer E. Goehler, Portland, Orex.
Application November 9, 1936, Serial No. 109,904
4 Claims.
(Cl. 158-73)
.
of them, placement being correctly shown in Figs;
This invention relates to burners for burning
atomized fuel oil. Specifically it relates to that
type of fuel oil burner in which oil is _furnished
1, 2 and 4.
- under pressure to an atomizer, a current of air _
from a source such as a fan is delivered in the
'
«
'
.
In the drawing, I is a scroll shaped casing that
in general resembles that used in a certain type
of fan or the scroll casing of a centrifugal pump, 5
except that the external nozzle A2, receives air
path of fuel being ejected from the atomizer and
under pressure from an external source not
shown.
The chief object of the present linvention is to
.'I‘he bottom of the casing is closed by a plate
provide burner apparatus to produce a wide flame _ 3, that serves to support the fuel oil pipe l, and 1o
of short axial length to the end that such burner the usual pair of vignition electrodes 5 and 8 in
apparatus may be installed in a short furnace ' case this type of starting apparatus is desired.
the mixture of oil and air is burned.
and yet cause the combustion of fuel in sus
pension and not in contact with the furnace walls.
Partially closing the upper part of the casing
i, is a diaphragm member 1, provided with an ap
As is well known, fuel ofv the kind here con
templated, generally designated as “Diesel oil”
15 must be burnt in suspension, except at a consid
erable sacrifice in economy. Since fuel of this
general type must be _gasiiied before ignition, if
proximately circular opening .8. Superposed on 15
the diaphragm 1, is an expansion chamber de
fined by a short cylindrical wall 9 and a converg
ing wall Ill,- that delimits a hollow frusto conical
it is to be burnt in suspension, an additional ob
ject is to provide a means that will gasify all of
20 the liquid fuel fed to it while the fuel is in sus#
outlet Ii, symmetrical with and axially in align
20
ment with the opening 8, in the diaphragm 1.
The opening 8, should be very closely restricted
to comparative size with the top of the frusto ,
conical outlet.' 'I'he short cylinder l2, if very
The invention herein consists in using the "short, improves the action of the burner, but
known scroll shaped casing, similar to those used may -be> dispensed with without departing from 25
‘ pension.
.
in blowers or turbines, in combination with a
25_ thin plate provided with an orifice axially of the
casing and superposing a frusto conical Vexpan
‘ sion chamber, provided with a central circular
orifice, with means for forcibly delivering oil fog
in a plane, angular to the axis of the last named
30
orifice.
Additional objects are simplicity, low cost of
construction and total absence of fragile parts
likely to deteriorate with use, and other objects
that will be apparent from the description and
.35
the appended claims.
¿
The underlying principle of the invention is
based on the physical fact that there is always a
low pressure area in the center of a whirling mass
the mode of operation in any large degree.
-'
What the wall 9, the conical wall i0 and the
short cylindrical wall I2, really amount to is the
inlet end of a Venturi tube.
_ The atomizer ll and the electrodes 5 and 6 30
need no 'description as they are well known,
except that the atomizer is preferably a “60 de--
gree” nozzle type that will deliver the oil fog
about as indicated in Fig. 3.
l
«
In practice, the casing is furnished with the 35
4requisite amount of air to support combustion of
the fuel required to generate the required heat,
with very little excess. Upon delivery with suit
able velocity to the casing4 l, it of course imme
diately assumes a spiral whirling motion, using 40
of air, and that the partial vacuum thus created ‘ the opening 8 as a means for exit, through which
demands to be satisfied and _when used in an oil it passes, without substantial diminution ofve
burner as described will pull particles of fuel back locity, into the expansion chamber where the
into the center of the combustion zone, from _ inequality of its whirling motion is tempered and
equalized. What is meant here is that if the open- 45 _
above, so long as they retain any weight.
'ing
8, be uncovered by removing the superposed4
I
attain
the
objects
outlined
bythe
structure
45
parts. the air flow tested by chemical smoke will
illustrated in the following drawing, in which,
show a very irregular delivery and the main body
Fig. 1 is a plan or top view of my new burner;
of the smoke will whip rapidly around the _open
Fig. 2 is a section on the line 2--2 of Fig. 3;
mg.
Eig. 3 is an Orthographie projection of Fig. 1;
40
Fig. 4 is a section on the line 4-4 of Fig. 3
showing the' important diaphragm 1; andv
Fig. 5 is a vertical section on the line 5-5 of
Fig. 1 except that the electrodes 5 and 6 are dis- f
placed from -the preferred position to show both
By placing .the expansion chamber with its
Venturi contraction as shown and described, the
discharge from the outlet Il is uniform so far as
the eye can distinguish, even when oil _isabeing
supplied and burned,>but without substantial im- 55
2
¿3,117,881
pairment of the whirl originally imparted by the
casing l. In any event, a very pronounced whirl
is evident. This whirl, as previously noted, cre
ates and maintains a low pressure area. in the
center of it that probably extends nearly to or
below the line 20.
(See Fig. 5.)
'I'his low pressure area or partial vacuum is
less pronounced and the burner correspondingly
less eiîectìve if the short cylinder I2 is omitted.
10 Also there will be a flatter spread to the flame,
which is usually undesirable.
.
'
With it, the delivery of air which determines
the location of the zone of combustion is sub
stantially that shown in Fig. 3 by the dotted
15 lines designated by "C.” It will be understood
that this is a vertical section as with the struc
ture, and that in plan the combustion zone is
a ring surrounding the burner outlet.
The ring of ñre surrounding the outlet immedi
20 ately assumes a very high temperature upon igni
tion of the oil spray, while the center (in plan)
is clark, and looking down upon the :llame one
can sometimes actually see the burner tip,
though the extreme brightness of the ring inter
25 feres.
' It will be noted from the diagrammatic indi
cation of the manner of fuel combustion in Fig.
air flow. Theyv are best disposed as shown in
Figs. 1, 2 and 4.
What I claim as my invention and desire to
secure by Letters Patent, is,
. 1. In an oil burning apparatus, a scroll shaped 5
air receiving casing provided with a tangentially
placed air inlet opening, a thin plate closure
member for one side of the casing, said plate
being provided with an axial orifice, a frusto
conical expansion chamber superposed on the
thin plate member, said chamber being provided
with a top opening> spaced above and substan-tially of the same size as the oriñce in the thin
plate, and means in the upper part of the frusto
conical expansion chamber for discharging a 15
spray of atomized fuel through said top open»
ing and at a wide angle to the axis thereof.
2. The structure as claimed in claim l with
the addition of a short cylindrical Wall member
surrounding the top opening of the expansion
chamber.
.
l
3. In an oil burner, a scroll shaped casing of
the character described having a tangential air
inlet opening, said casing having a top provided»
with an axially located port, an expansion cham
25
ber superposed on said top, said chamber having
a lower portion of greater area than the area
3 that initially a very small part of the atomizer
discharge engages the outgoing air over the rim of said port and surrounding said port, said
chamber also having converging circular walls
30 of the cylindrical wall I2. With a good atomizer,
terminating in an opening in spaced axial aline
kept clean, the very iine oil i 1g rises a ver-yl ment with said port, a cylindrical Wall surround
short distance above the burner center, ordinarily ing the last n-amed opening and deñning an` air
a matter of inches, from whence it falls down
discharge nozzle and means for discharging oil
35
wardly and mostly outwardly into the extremely
hot ring of ñre, generated by the small quantity
of oil originally ~intercepted by the air blast and
burned in suspension by anexcess of atmos
pheric oxygen as will be immediately apparent;
this falling of the center oil particles being
strongly promoted by the low pressure area in
the center of the burner outlet.
The oil pipe and the nozzle should be in the
center of the apparatus as shown and the elec
r trodes, though necessary, are more or less of a
nuistance in disturbing the smoothness of the
fog into the air discharged from said nozzle. ‘
4. In oil burner appara-tus, a scroll shaped cas- -
ing that is provided with a tangential air inlet,
a bottom closure for said casing, a partial top
closure for said casing that is a thin plate pro
vided with a centrally disposed orifice, `frusto
conical walls larger in inner bottom diameter
than the orifice in the plate that are superposed 40
on the plate to provide an air outlet spaced above
the said oriñce and means for delivering atomized
fuel oil into said air outlet at a Wide angle to
the axis thereof.
ELMER E. GOEHLER.
45
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