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Патент USA US2404646

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July 239 1946.
H. J. DE N. MìccoLLUM "
_
HEATER
Filed Feb.` 18., 1943
QN)
E
2,404,546
Patented July 23, _1946
2,404,646I
UNITED STATES PATENT OFFICE
2,404,646
HEATER
Henry J. De N. McCollum, Chicago, Ill.; Thelma
McCollum executrix of said Henry J. De N. Mc
Gollum, deceased
` Application February 18, 1943, Serial No. 476,266
11 Claims.
(Cl. 126-116)
l
2
My invention relates to heaters and more par
suitable means. The igniter 3B, in accordance
with usual practice, may be disconnected from
its source of current by a ,thermostatic switch
after the heater attains normal operating tem
ticularly to heaters of the internal combustion
type.
An object of my invention is to provide an in
ternal combustion type of heater having improved
perature and I provide a re-igniter 32 to main- ‘
means for obtaining thorough vaporization of the
tain combustion after the igniter 3E] has been
cut out.
IThe hot gases resulting from the combustion
in the combustion chamber iiow into the right
liquid fuel.
Another object of my invention is to provide
new and improved means for imparting any de
sirecl degree of preheating to the combustible 10 hand ends of the longitudinally extending flues 34
formed in a cylindrical heat exchanger indicated
mixture.
generally by reference character 36 and pass from
Another object of my invention is to provide a
the lefthand end of these iiues into an outlet
new and improved heater wherein the foregoing
chamber 38. An outlet ñtting 4D is ñxed in a wall
objects are accomplished by a structure which is
compact, light in weight, inexpensive to manu 15 of the chamber 38 and has a threaded end 42 to
which any suitable exhaust pipe may be con
facture, and trouble-free in use.
nected whereby the cooled gases may be dis
Other objects and advantages will become ap
charged from the outlet chamber 38 through ñt`-parent as the description proceeds.
In the drawing:
‘
ting llt and the exhaust pipe connected thereto.
The heat exchanger 36 comprises a corru
Fig. 1 is a longitudinal, sectiona1 view of a pre 20
gated `sheet 44 of aluminum or- other suitable
ferred form of heater embodying one form of
material bent into the form of a cylinder and
my invention; and
‘
having its contacting edges Welded to form a
Fig. 2 is a partial, transverse section taken on
seamlessl tube. Fins 46 of aluminum or other
the line 2--2 of Fig. 1.
In Figs. l and 2, I have illustrated a preferred 25 suitable material are welded or otherwise secured
in the folds 48 formed in the aluminum sheet 44
form of my invention comprising a heater having
between the ñues 34. The fins 46 are in the form
an air inlet Iii adapted to be supplied with air
of sheet metal 'strips having their outer edges
from a ram, blower, or any other suitable source
of air supply. A part of the air entering the
serrated, as indicated at 5E, to divide the radially
inlet il) passes into a Venturi tube I2, having a 30 outward portions of the strips 46 into a plurality
of fingers 52 to increase the rate of heat trans
fuel jet I4 provided with radial passages I 6 in
fer from the fins to Ventilating air directed there~
the throat of the Venturi tube. The jet I4 is
supplied with any suitable liquid fuel, such, for
over in a manner hereinafter described.
example, as gasoline or kerosene from any suit
able source of fuel supply and the fuel discharged from the passages l 6 in the jet I4 mixes with the
air entering the lefthand or inlet end of the Ven
turi tube l2 to form a combustible mixture.
This mixture passes from the outlet or right
A tubular muffler 54 is located inside of the alu
minum sheet 44. This muffler comprises an outer
shell 56 and sound absorbing material 58, 'such
as stainless steel wool or glass wool, located be
tween the shell 55 and the sheet metal cannister
22 which forms the inner wall of the muffler. The
hand end of the Venturi tube I2, through a wire 40 shell 5B is provided with openings 6i! which form
acoustic couplings between the interior of the
Iscreen i8 into the fibrous material 2B contained
shell 56 and the Íiues 3Q, whereby sound may en
in a sheet metal cannister 22 having an opening
ter the shell 5t and be absorbed by the mate*
24 in registry with the outlet end of the Venturi
tube i2. The fibrous material 20 may be stain- . rial therein. While the muffler proper consists of
less steel wool or glass wool, or a mixture of stain 45 only a relatively thin layer of sound absorbing
material arranged in the form of a tube, I have
less steel wool and glass wool, or any other suit»
found that >such a thin layer absorbs all of the
able material.
objectionable sound and is entirely satisfactory.
As the combustible mixture passes `through the
The heater is provided with a cylindrical casing
fibrous material, the fuel and air are thoroughly
mixed and may be preheated to any desired de 50 62 which Isurrounds the heat exchanger 36 and
directs Ventilating air thereover. The lefthand
grees, as hereinafter explained. The combustible
end of the cylindrical casing 62 communicates
mixture flows through the outlet openings 2B in
with the inlet I0 by way of tapered passage 64
the righthand end of the cannister 22 and passes
formed between an outer sheet metal cone 66
into a combustion chamber 23 where it is initially
ignited by an electrical igniter 30, or any other
and an inner sheet metal cone 68. The right
2,404,646
3
4
hand end of the casing 62 may communicate di
rectly with the airplane cabin or other space to
be heated, or may be connected to a duct system
having several outlets placed at selected locan
tions to distribute the heated Ventilating air to
bvstible mixture to said combustion chamber,
several portions of the same space or to separate
spaces.
The ends of the aluminum sheet Mi of the heat
exchanger 3s are illustrated as being located in
grooves formed in rings 'ill and '12, which form
a convenientl means for supporting this plate and
associated parts. The ends of the plate ¿is are
sealed to the rings lul and l2 by welding, or
said means including a Venturi tube, and means
forming a passage through said heat exchanger
filled with ñbrous material interposed between
said combustion chamber and said Venturi tube
and through which the combustible mixture
must pass before entering the combustion cham-Y
ber, part of said fibrous material being located
immediately adjacent the end of said Venturi
10 tube.
` 2. A heater comprising a combustion chamber,
a heat exchanger receiving products of combus-`
tion from said combustion chamber, means for
otherwise, to prevent leakage of the products of
directing Ventilating air over said heat >ex
combustion into the passageways'for the venti 15 changer», a carburetor for supplying combustible
lating air_ The ring ‘It is attached to and sup
mixture to said combustion chamber, means
ported by the cone S8, whereas the ring 12 is
forming a passage through said heat exchanger
attached to and supported by the end wall 'i4 of
interposed between said carburetor and said
the combustion chamber ‘28.
`
combustion chamber, and steel wool in said pas
Stainless steel wool is a relatively good heat 20 sage for preheating, vaporizing and intermixing
conductor, whereas glass wool is a relatively poor
the fuel and air in said lcombustible mixture prior
heat conductor. When a heavy fuel is used, or
to the entry of this mixture into the combustion
when, for any other reason, a »relatively great
amount of preheating is desired, the muliler shell
chamber.
55 and cannister V22; can be ñlled with stainless
bination of a heat exchanger, a combustion
chamber located at one end thereof, a carburetor
located at the other end of said heat exchanger,
steelV wool'. On'the other hand, when substan
tially no preheating is desired, the muñler shell
and cannister can be ñlled with glass wool.
When some intermediate degree of preheating is
sought, part of the space inthe muli‘ler and can
fibrous material interposed between said car
buretor and combusti-on chamber in heat ex
change relation with said heat exchanger and
nister can be filled with stainless steel wool and
the other part With glass Wool and in this marl
through which combustible mixture supplied by
said carburetor must pass before entering such
ner any desired degree of preheating can be
obtained.
n
,
3. In a'heater of the class described, the com
combustion chamber, said fibrous material pre#`
heating, vaporizing and intermixing the fuel and
Y
' In my invention the combustible mixture 35 air in the combustible mixture prior to its entry
into said combustion chamber, and Ymeans for
fibrous material which insuresk vaporization of
-directing Ventilating air over said heat ex
formed in the carburetor is ñrst passed through
all ofthe liquid fuel andß thorough mixing of the
changer,
Y
vaporized fuel and air before this` combustible
e. A heater of the class described, comprising
mixture enters the combustion chamber. In my 40. a tubular heat exchanger, a casing enclosing said
invention the fibrous material is exposed to heat
heat exchanger, said casing having an inlet for
created in the burner and by proper selection of
Ventilating air adjacent one end of said heat ex
the particular 1¿ind or kinds of fibrous material
changer, a. carburetor at said end of theV heat :ex
Used, any desired degree of preheating of the
changer and receivingair from said inlet, a com
combustible mixture may be provided. These
y bustion chamber at the opposite end of said heat
featuresr render my novel heater particularly
exchanger for supplying products of combustion
thereto, means forming a passage located in said
adapted for use with different fuels` such, for
exampla as gasoline, lsercseneand fuel oil, since
these fuels require different degrees of pre.
>heating to burn efficiently. The length of the
heat exchanger and` affording communication
between said carburetor and combustion cham
ber, fibrous mat rial located in said passage, a
muiiler interposed between said passage and said
heat exchanger, and an exhaust chamber sur
fibrous pathrthrough which. the combustible mix?
ture flows before entering the combustible cham-`
ber can also be varied to afford just the right
rounding said carburetor and receiving products
of combustion from said heat exchanger.
5. A heater of the class described, comprising
amount of preheating, vaporizatíon and inter- -
mixing of the fuel and air before thisl fuel enters
the combustion chamber to adapt the heater to
any particular fuel or to satisfy special oper
a tubular heat exchanger, a combustion chamber
for supplying hot products of combustion to said
The foregoing advantages are attained in a
heat exchanger, a muñier located in said heat ex
changer, said muli‘ler comprising inner and outer
ating conditions.
structure which is compact, light, inexpensiveto
manufacture and which requires a minimum of
service attention, This heater is particularly
adapted for use in aircraft, but is notlimited to
such use and
60 tubular shells forming a space therebetween
filled with sound absorbing material, and means
for supplying a combustible mixture to said com
bustion chamber through the ‘tubular inner shell
capable of general application.
of said muiiler.
While I have described only one embodiment
of my invention, it is Ito be understood that my
invention is not limited to the particular details
shown and described, but may assume numerous
forms and that., the scope of my inventionV is de
fined in the following claims.
I Claim:
l, A heater comprising a combustioncliamber,
a heat exchanger communicating with. said com
bustion chamber and heated byproducts ofV com
bustion therefrom, means for supplying a com
.
6. A heater comprising a combustion chamber,
a heat exchanger receiving products of combus
tion from said combustion chamber, means for .
70
directing Ventilating Vair over said heat ex
changer, a carburetor for supplying combustible
mixture to said combustion chamber, means
forming a passage through said» heat exchanger
interposed between said carburetor and said
combustion chamber, and-glass wool'in saidn pas
sage. for preheating, vaporizing and intermixing
75 the fuel and air in said combustible mixture prior ,
2,404,646
said passage with said combustion chamber, 1i
to the entry of this mixture into the combustion
chamber.
’7. A heater of the class described, comprising
brous material located in said passage, and a
metal screen interposed between said carburetor
a heat exchanger, a combustion chamber for
and said passage.
supplying products of combustion to said heat
exchanger, a muffler located in said heat ex
Y
10. A heater comprising a heat exchanger, a
combustion chamber for supplying hot gases to
said heat exchanger, a muffler in said heat ex
changer, means for supplying combustible mix
ture to said combustion chamber, means form
ing a passage through said muffler connecting
ture to said combustion chamber through said
said means with said combustion chamber, said
passage, and steel wool located in said passage.
passage and muñler providing separate spaces,
8. In a heater of the class described, the com
fibrous material in said spaces and comprising
bination of a heat exchanger, a combustion
stainless steel wool in one of said spaces and glass
chamber for supplying hot products of combus
tion to said heat exchanger, a tubular mufl’ler 1o 15 wool in the other of said spaces to proportion the
amount of preheating of the combustible mix
cated in said heat exchanger, means for sup
plying a combustible mixture to said combustion
l1. A heater of the class described, comprising
chamber through said muflier including fibrous
a tubular heat exchanger, va combustion cham
material within said muñler through which said
combustible mixture passes as it travels the 20 ber for supplying hot gases to said heat ex
changer, and a muffler in said heat exchanger,
length of said muiiler.
said mufîler comprising inner and outer tubular
9. A heater of the class described, comprising
shells affording an annular space therebetween
a heat exchanger, meansfor directing ventilat
which is radially narrow as compared to the
ing air over said heat exchanger, a combustion
chamber for supplying hot gases to said heat ~ radius of said'outer shell, sound absorbing ma
terial between said shells, and means for supply
exchanger, a carburetor for supplying combus
ing a combustible mixture to said combustion
tible mixture to said combustion chamber, means
chamber through said inner tubular shell, said
interposed between said carburetor and combus
combustible mixture being preheated as it passes
tion chamber and forming a passage there
between and through said heat exchanger, said 30 therethrough.
HENRY J. DE N. MCC'OLLUM.
means having a plurality of openings connecting
changer, stainless steel wool in said muilier, said
muiller having means forming a passage there
through, means for supplying a combustible mix
ture.
,
Y
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