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Патент USA US2117511

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May 17, 1938,
|__ L. SCQTT
Filed Jan. 10, 1935
5 Sheets-Sheet 1
May 17, 1938.,
Filed Jan. 10, 1935
5 Sheets-Sheet 2
May 17, 1938.
|_, |__ SCOTT
Filed Jan. 10, 1935
3 Sheets-Sheet 3
Patented May 17, 1938
Lewis L.‘Scott, St. Louis, Mo.
Application vJanuary 10, 1935, Serial No; 1,127
3 Claims. (Cl. 122-333)
This invention relates to a novel construction
of an oil furnace used for heating homes and the
like. One of the objects of my invention is to
provide a simple and relatively inexpensive oil
furnace that will be durable and‘ reliable in oper»
Another object of my invention is to provide a
novel arrangement for burning the oil in said
furnace so as to get very high combustion effi
‘10 ciency as well as over-all furnace e?iciency.
A further object is to provide an oil furnace
that will get up steam or raise the temperature of
water very rapidly, and that will have very rapid
further object is to provide what I term as
an economizer section, which section is lined with
a sound absorbing material as well as a heat in~
sulating material so as to absorb to a large ex
energy and can only travel a limited distance up
wards. It will either be burned or fall back into
the flame, and will not strike the crown sheet
or water legs of the boiler, which, in the embodi
ment speci?cally illustrated, form parts of the
walls of the combustion chamber. It is thus to
be distinguished from burners of the other type
mentioned in which the kinetic energy of the air
and oil mixture is considerable and in the envi
ronment here disclosed, is sufficient to carry some
of the oil beyond the flame into contact with the
cooler portions where the oil will collect thereby
prevening proper and complete combustion.
The numeral 5 indicates ?re brick lining for
the combustion chamber, which is substantially 15
square. The combustion chamber is surrounded
by the water section of the boiler II], which sec
tion connects to the upper water section H.
tent the noise of combustion.
In the accompanying drawings, Figure 1 is a
sectional view of my oil furnace, showing the
burner located underneath, and arranged to burn
numeral l2 indicates the outlet for steam or hot
water, and the numeral [3 indicates the return
a vertical oil ?ame.
Figure 2 is a front view of Figure 1 with a part
the boiler case broken away.
per coil commonly used for heating domestic hot
Figure 3 is a sectional plan View of Figure 2,
the section being taken on the line AA of Figure 2.
Figure 4 is a sectional view of the preferred
form of my oil furnace, similar to Figure 1, but
with the burner and outer casing removed.
Figure 5 is a plan sectional view on the line
BB of Figure 4.
Referring now to the drawings, the numeral I
indicates an oil burner which is provided with a
motor 2, and an air blower 3. The numeral 4 in
dicates an ignition transformer adapted to fur
nish a spark“ at the spark terminals 5, which spark
is adapted to ignite the oil sprayed from the noz
zle 6. The motor 2 is adapted to drive an oil
40 pump '1 (see Figure 2), which pump is adapted to
supply oil from the tank not shown, and deliver
it to the spray nozzle 5, said motor is also adapt
ed to drive the blower wheel in blower 3, and to
deliver air through the vertical air tube 8 to pro
mote combustion of the oil from the spray noz
zle 6. The type of burner here illustrated
and described is more fully disclosed in my Pat
ent No. 1,334,566. The air is supplied under low
pressure (1/4" of water, about) and is insu?icient
to cause any substantial atomization of the oil.
This burner is to be distinguished from others
which use air under relatively high pressure for
the purpose of atomization. In the present
structure the oil sprayed by the nozzle 6 and
thereby mixed with the air has little kinetic
pipe connections which connect to the lower part
of the boiler.
The numeral I4 indicates a cop
The numeral l5 indicates a gauge com
monly used, and the numeral I6 indicates a steam
blow-off valve commonly used on this class of
The numeral ii indicates an access
door in the outer casing l8 for observing the oil
flame through the peep-hole I9, which peep-hole
is usually covered by pyrex glass. The numeral 30
20 indicates insulation which completely covers
the entire boiler, with the exception of the bot
tom. The numeral 2| indicates a sound absorb
ing blanket which is secured to the inside lower
part of the boiler casing l 8 around the oil burner.
‘This material will absorb mechanical noises from
the burner. It will be noted in the structure
shown in Figures 1, 2 and 3 that water tubes
are arranged to join the lower water section with
the top water section, where in the structure 40
shown in Figures 4 and 5 there is a steel box-like
water compartment around the ?re brick 9.
Combustion of the oil ?re is completed in the
combustion chamber which is surrounded by the
?re brick 9. The products of combustion pass to 45
the economizer space 22 through the opening 23,
said products of combustion acting to heat the
economizer 24, which is located in the economizer
space 22 and connected to the upper and lower
sections of the boiler. The products of combus 50
tion pass downward in the economizer space 22
and out through the flue opening 25 to the chim
ney not shown. The numeral 26 (see Figure 1)
indicates a safety device commonly used with oil
burners, but which forms no part of the present 55
invention. It will be noted that the economizer
24 in Figures 4 and 5 consists of six copper coils
which are secured to the top and bottom of the
boiler proper by union connections 21. These
coils are wound right and left hand, and the three
coils nearest to the boiler are the left hand coils.
The reason for winding them right and left hand
is for convenience in making connections to the
boiler without having the front row of coils
10 interfere with the back row of coils. The numeral
28 (see Figures 4 and 5) indicates a sound absorb
ing material as well as a heat insulator which
entirely surrounds the economizer coils 24. The
numeral 29 indicates a cast iron door having insu
15 lating material attached to its under side which
covers an opening at the upper part of the econ
omizer housing 22 and this opening serves as a
pressure relief door in the event of an explosion
of vaporized oil within the boiler and also serves
20 as an access door for cleaning the economizer
An access door 354 (see Figure 1) is provided
in the casing and acts as a cover for the opening
through which the door 29 is removed.
In the structure shown in Figures 1, 2 and 3,
where water tubes join the top and bottom sec
tions, I provide tie bolts 3| for holding the top
and bottom sections together. The springs 32 are
provided to allow for the di?erence in expansion
and contraction between the vertical water tubes
and the bolts 3|. The numeral 33 (see Figure 2)
indicates the conventional water glass and gauge
cocks commonly used on steam boilers.
The nu
meral 34 (see Figures 4 and 5) indicates support
brackets for attaching the ?ue casting 25. These
:35 brackets are rigidly secured to the boiler proper.
The numeral 35 indicates support legs for sup
porting the boiler proper, and the numerals 36
and 31 (see Figure 2) indicate removable panels
for giving access to the oil burner I.
The nu~
40 meral 38 (see Figure 2) indicates louver openings
in the sides of the casing l8 through which air
passes to the burner I. It Will be noted that there
is a space 39 between the casing l8 and the boiler
insulation 20.
I have found that by projecting atomized oil
from the spray nozzle vertically and by providing
an enclosed combustion chamber which is sur
rounded by a heat absorbing medium I get un
usually high combustion ef?ciency. The reason
for this is that a small particle of atomized oil
which is projected from the nozzle has very little
kinetic energy and can only travel a limited dis
tance upwards where it must either burn or fall
back into the flame. Where the atomized oil is
projected horizontally as is common practice this
same result cannot be obtained and some of the
oil particles escape to the chimney unburned,
thereby making for low combustion e??ciency.
It will be noted that I have provided a U shaped
travel for the products of combustion, namely, 10
upward, over and downward to the flue. By this
arrangement the products of combustion are en
tirely surrounded by heat absorbing medium and
said products of combustion pass to the flue at
the point where the coolest Water enters the econ 15
omizer section, thereby making for high e?iciency
in the heat absorbing medium.
I claim:
1. In a boiler, an oil burner having a nozzle ar
ranged and adapted to spray oil vertically, verti 20
cal walls of refractory material spaced from the
axis of the nozzle and extending upwardly from
the level of the nozzle a sufficient distance to sur
round the space of active combustion and form
ing a combustion compartment, a Water shell 25
over the compartment, a Water shell near the bot
tom of the compartment, one or more water legs
about the compartment connecting the shells, an
economizer chest parallel to said compartment
and communicating at its top with the top of the
compartment, a flue outlet from the chest, and
Water tubes in the chest connected between said
2. In a boiler, a combustion compartment, a
water container over and above said compart 35
ment, a casing having sound absorbing walls
about the top and sides of the boiler, an oil burn
er tube opening into the combustion compart
ment, and a sound absorbing blanket about said
tube adjacent the compartment.
3. In a boiler, a vertical combustion compart
ment, a water container over and about said com
partment, a casing having sound absorbing walls
about the top and sides of the boiler, legs for sup
porting the boiler above a ?oor upon which it is 45
placed, an oil burner tube opening into the com
bustion compartment, and a sound absorbing
blanket about said tube immediately below the
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