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0¢f~ 1, 1946- ‘
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c. F. BRooKl-:s' `
2,408,605»
FUEL HEATER EOE'INT‘EENAL-COMBUSTIÓN ENGINES
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Filed Aug. 28,- 1944
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Patented Oct. l, 1,946
2,408,605
`UNITED"STATES PATENT OFFICE
FUEL HEATER FOR INTERNAL-COMBUSTION
ENGINES
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Charles F. Brookes, Toronto, Ontario, Canada` v ‘
Application August 28, 1944, Serial No. `551,575 Y
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(Cl. 257-229)
5 Claims.
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2
The invention relates to improvements in fuel
heaters forinternal combustion engines as de
scribed in the present specification and shown in
the accompanying drawing that forms a part of
tance and which isadapted to be‘inserted into
the exhaust manifold 'I through a suitable open'
ing through the top' wall 2 of said'manifold,
whereby the heating chamber may be supported
the
above the exhaust manifold.
same.
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The main object of the invention is to provide
simple and efficient means for heating the fuel
to a high degree just prior to its entry into the
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of `its length, particularly at, and above, ~the
junction of said pipe with the apertured wall of
Carburettor whereby it will vaporise readily, thus
thelmanifold is enlarged slightly Vand provided
assuring thorough combustion of the fuel, with 10' with"externa`l threads 8 whereby said vpipe may
the resulting advantages
such as increased
be threaded into the opening inthe top wall 2
and'whereby a nut 9 may be threaded downward
ly thereon into engagement with a suitably aper
tured block I0 which is suitably secured to the
said wall of the manifold, to ñrmly'secure the
pipe to the manifold. This >pipe is preferably
projected into the exhaust manifold to the extent
that thelower end thereof will terminate slightly
short of the wall of he manifold opposite to that
mileage per unit of fuel, elimination of carbon,
and more efficient engine operation.
Av further object of‘the invention is to provide
a fuel heater having but a single connection with
the exhaust manifold of the engine thus making
it possibleto readily incorporate said heater with
the manifold, even in cases where, due tothe con
fined grouping of engine parts about the mani
fold, no appreciable amount of such manifold is 20 through which the pipe enters’whereby to leave
a space between the end of the pipe and the linner
Generally the objects of the invention are to
wall of the> manifold for the direct passage of
provide an eñicient fuel heater of simple and
some of thegases.
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durable construction which can be produced at
The pipe 'I is provided near its lower end in
25 the side thereof positioned in the path of the
‘ The invention consists in the novel features of
gases; through the exhaust, with an inlet II
accessible.
low
cost.
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construction, arrangements and combinations of
through which'the exhaust gases can pass up
parts described in the present specification and
more particularly pointed out in‘ the claims vfor
-provided on its opposite side with an outlet I2
novelty following.
wardly into the casing 3, and said pipe is also
30 through which the gases re-enter the exhaust
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-In describing the invention reference will be
made to the accompanying drawing, in which:
Y after circulation through the said casing,
The pipe> 'I is divided throughout its length by
' vFigure 1 is an interior plan view of the heating
a ypartition I3 which extends transversely in re
chamber with the top of the. casing removed.
lation to lthe exhaust manifold and divides'the
said fpipeinto >an upward passage I4 through
- Figure 2 isa vertical sectional View through the
structure shown in Figure 1 and the associated
part of the exhaust manifold.
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Figure 3 is a cross sectional view'through an
exhaust manifold of circular form showing a
which vthe gases entering the inlet II are con
ducted into'the heating chamber, 'and a down
ward passage -Iâthrough which the gases from
the'` said chamber flow and are permitted to re
method of securing the heater to a manifold of 40 enter the exhaust through the outlet I2. .
such form.
Y
The partition I3 extends upwardly into the cas
ing >3 and terminates just short of thev closure 5
and at least that part of said partition which is
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ïLike numerals of reference 'indicate -corre
sponding parts in the various figures.
vReferring to the drawing thev numeral I indi- '
catesV the exhaust pipe of’an' engine, 'which has
aflat top wall 2.
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3 isvthe casing which provides the heating
chamber through which the fuel pipe 4' is passed,> ~
said casing preferably being circular in plan, andk
consisting -of a bottom and a circular side wall 50.
and which is adapted to be closed at its top end
by means of a cap 5.
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The’botto'm of the casing 3 is provided witha
central opening 6.. around which is fitted' a pipe
1 lwhich extendsoutwardly a consi’derablediss
ì
The pipe 'I throughout a considerable portion'
located within said casing is formed to provide a
conduit I6 for the gases open at its top end,‘whic_h
latter is spaced but slightly from said closure
whereby such closure will act as a baffle to dis
seminatethe gases throughout the heating cham-`
ber.>
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The preferred method of providing the conduit
I6 is by providing that portion of the partition I3
which is located within the casing, and if desir
able _that portion‘of said partition which is posi
tioned above the exhaust manifold, with an ex
tension IT frombne edge thereof ben't‘to semi'4-V
2,408,605
3
circular shape and secured along its edge to the
said partition at or near the edge of the latter
opposite to that from which said extension pro
jects.
4
variations and modifications as come within the
scope of the appended claims.
What I claim as my invention is:
l. A heater for the fuel supplied to an internal
While the partitioning member is described Ul combustion engine, comprising a casing closed
l hereinabove and shown in the drawing as being
formed to provide the conduit as an integral part
thereof, it is of course understood that such con
duit may constitute a separate tube aligned with
the top end of the inlet through the pipe 'l and
suitably sealed against the escape of the heating
medium into the casing except through the top
end of said tube.
The fuel pipe 4, in which is interposed, at a
point prior to its entry into the heating chamber,
at one end and having its other end provided
with an opening concentric therewith, a pipe
leading outwardly from said opening and adapted
to be inserted in the exhaust manifold of said
engine, said pipe having an inlet in one side
thereof positioned in the path of the gases pass
ing through said exhaust manifold and having an
outlet for the gases diametrically opposed to said
inlet, a partitioning member extending upwardly
through said pipe into said casing and terminat
ing slightly short of the closed end of the latter
a suitable valve IS, enters the casing at a point
and dividing said pipe into two longitudinally ex
_near the bottom of said casing and spirals around
tending passages whereby the hot gases entering
the conduit I6 in outer and inner spaced coils'
said inlet are caused to flow upwardly into said
and leads outwardly from the inner coil through
a suitable opening in the wall of the casing sub 20 casing through one passage and after circulat
ing throughout the area of said casing will flow
stantially diametrically opposite the point of en
downwardly through the other of said passages
try into the casing, and from whence it leads
to said outlet, said partitioning member through
into the Carburettor (not shown in the drawing). `
out that portion which is located withinV said cas
In the operation of this invention a large pro
portion of the heated gases from the exhaust flow 25 ing being formed to provide a conduit open at
its top end whereby the gases are expelled at
directly into the inlet H in the pipe ‘l andare
the top of said casing, and a fuel pipe passing
forced upwardly under pressure through the in
through said casing and having that portion lo
let side of said pipe and through the conduit IS
cated within said casing coiled around said con
into the heating chamber where they circulate
around the coiled fuel pip-e and serve to heat the 30 duit whereby the fuel passing through said fuel
pipe will be heated by the hot gases within said
fuel in said fuel pipe to 2, high temperature, and
are drawn b-y vacuum down the outlet side of
casing.
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said pipe l and pass through the outlet I2 into
_ 2. A heater as set forth in claim 1-, in which
the exhaust manifold.
said conduit is formed by an extension from one
edge of said partitioning member bent to semi
circular shape in cross section> at» the side of said
partitioning member at which said inlet is `lo
cated and sealed to the said partitioning mem
As the inlet to the pipe 'l is located in the side
of said pipe directly in the path of the gases
expelled into the exhaust under pressure from
the engine it will be seen that the gases entering
the inlet will be forced upwardly into the heating.
chamber under pressure. Furthermore the shapey
of the heating chamber and the substantially
concentric positioning of the vertical conduit
therein makes possible the accommodation with
in the chamber of the maximum amount of fuel
pipe to a given area, and further provides for
the maximum heat being applied to the fuel just
prior to its exit from the heating chamber.
In Figure 3 the device is shown as being» applied
to an exhaust manifold of circular cross section,
in which case an apertured adapter I9 having a
semi-circular recess 20 in one face thereof adapt
ed to conform to the peripheral contour of the
manifold, and a flat top surface 2l adapted to
conform to the fiat »face of the adjusting nut,
is placed over the manifold with its aperture in
alignment with the threaded opening in the man
ifold through which the pipe l enters said mani
foldy so that when the pipe l is threaded into’said
opening and the nut is turned down against the
adapter the device will be securely locked to the
manifold.
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While the hereinabove described fuel heater
has been shown and described ras associated with
the exhaust manifold of an engine it is of course
ber and its lower edge sealing the casing against
40 the escape of the heated gases thereinto at the
bottom of said casing.
3. A heater for fuel supplied'to an internal
combustion engine, comprising aZ casing closed at
one end and having an opening through the other
end thereof, a pipe leading outwardly from said
opening and adapted to» be inserted in the ex
haust manifold of the engine in the path of
progress of the gases through said exhaust mani
fold, an apertured block secured- to the wall of
50 said manifold with its aperture aligned with the
opening through which said pipe enters said man
ifold, a nut threading over said pipe into engage
ment with said block and securing said pipe to
said manifold, said pipev having an inletI located
55 within said manifold in the path of said gases
and'also having an outlet in substantially dia
metrically opposed relation to said inlet, a par
titioning member separating the inlet side' of
said pipe from the discharge side throughout. the
60 length of said pipe, said partitioning member liav
ing a tubular extension projecting upwardly into
said casing to a point near the closed end of
the latter whereby theßhot gases entering said
' pipe through said inlet will be carried upwardly
65 and expelled through the top end of said tubular
to be understood that it can be incorporated with
extension, and a fuel pipe passing through said
any other suitable means for supplying steam,
casing and having that part thereof located with
hot water, hot air, etc. thereto.
in said casing coiled around said tubular exten
While I have illustrated and described the pres
sion.
ent preferred forms of construction for carrying 70
4. A heater as set forth in claim l, in which
out my invention, these are capable of variation
said fuel pipe extends in a series of turns around
the inner periphery of the casing and is turned
and modification without departing from the
inwardly and extends around the saidA conduit in
spirit of the invention. I, therefore, do -not wish
another.' series of turns and thence leads from the
to be limited to the precise details of construc
ti‘on'set forth, but desire to availy myself of such` 75y casingto the Carburettor, whereby in its passage
2,408,605
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through the casing the fuel is subjected to the .
greatest heat just prior to exit from the casing.
5. In a heater for >fuel supplied to an internal
combustion engine, a casing closed at its top end
and having an opening in its lower end, a pipe
leading outwardly from said opening and adapt
ed to be inserted in the exhaust manifold of the
engine, a partitioning member extending through
out the length of said pipe and dividing said
pipe into two longitudinal passages leading re
spectively to and from said casing, said pipe hav
ing an inlet in one side thereof opposed to the
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inlet end of said exhaust manifold and commu
nicating with one of said passages, said pipe also
having an outlet opposed to said inlet and com
municating with the other of said passages, an
open -end conduit registering with the passage
leading to said casing and extending upwardly
within said casing and terminating in slightly
spaced relation to the closed end of the latter,
and a fuel pipe leading through said casing and
having that portionk thereof located within said
casing coiled around said conduit.
CHARLES F. BROOKES.
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