0¢f~ 1, 1946- ‘ - c. F. BRooKl-:s' ` 2,408,605» FUEL HEATER EOE'INT‘EENAL-COMBUSTIÓN ENGINES ' Filed Aug. 28,- 1944 l Patented Oct. l, 1,946 2,408,605 `UNITED"STATES PATENT OFFICE FUEL HEATER FOR INTERNAL-COMBUSTION ENGINES ` . ` ' ' Charles F. Brookes, Toronto, Ontario, Canada` v ‘ Application August 28, 1944, Serial No. `551,575 Y ~ (Cl. 257-229) 5 Claims. l 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. ~ ' ’ 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 ' " 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. ' 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. Y _ ` y ' Y I n 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 ' -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. ' 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 » 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. ' _ ’ f 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. ' ' ` - 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.> « 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. ` 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. Y 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 - ,- 5 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 6V 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.