CA1041392A - Fuel vaporizer for internal combustion engine - Google Patents
Fuel vaporizer for internal combustion engineInfo
- Publication number
- CA1041392A CA1041392A CA247,063A CA247063A CA1041392A CA 1041392 A CA1041392 A CA 1041392A CA 247063 A CA247063 A CA 247063A CA 1041392 A CA1041392 A CA 1041392A
- Authority
- CA
- Canada
- Prior art keywords
- fuel
- combustion engine
- block
- internal combustion
- engine
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M31/00—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture
- F02M31/02—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture for heating
- F02M31/12—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture for heating electrically
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M31/00—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture
- F02M31/02—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture for heating
- F02M31/16—Other apparatus for heating fuel
- F02M31/18—Other apparatus for heating fuel to vaporise fuel
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Abstract
ABSTRACT OF THE DISCLOSURE
A fuel vaporizer for the intake manifold of an internal combustion engine comprises a heat reservoir in which is em-bedded a low power electrical resistance heater. The heat reservoir comprises a block of heat conductive material pro-jecting laterally from the lower end of an elongate support and having an upwardly facing fuel impingement surface in the path of the liquid fuel stream from the carburettor. A switching arrangement is provided for de-energizing the heater on starting of the engine. This fuel vaporizer operates by preheating the heat reservoir block over a period of time before starting of the engine and thus avoids undesirably high power consumption.
A fuel vaporizer for the intake manifold of an internal combustion engine comprises a heat reservoir in which is em-bedded a low power electrical resistance heater. The heat reservoir comprises a block of heat conductive material pro-jecting laterally from the lower end of an elongate support and having an upwardly facing fuel impingement surface in the path of the liquid fuel stream from the carburettor. A switching arrangement is provided for de-energizing the heater on starting of the engine. This fuel vaporizer operates by preheating the heat reservoir block over a period of time before starting of the engine and thus avoids undesirably high power consumption.
Description
~34~L39Z
The present invention relates to a fuel vaporizer for the intake manifold of an.internal combustion engine equipped with a downdraft carburektor.
It has previously been proposed to provide a fuel : vaporizer for heating fuel discharged from a carburettor into the intake manifold of an internal combustion engine, particularly for use in cold climatic conditions.
. For example, United States Patent 2,597,251 teaches a fuel vaporizer comprising a tube containing an insulated heating -: 10- element and extending downwardly within a manifold intake from a retaining frame or band sandwiched between gaskets between a . carburettor flange and the manifold intake. The lower end of ~:i the tube is provided with a fuel trap consisting of a sleeve .~ mounted on the tube and extending downwardly to a hQrizontal plate having an annular upstanding peripheral flange and divided .
by a plurality of further flanges into pockets in which incoming ;
.. . fuel is trapped and vaporized by heat generated by the heating ''-J, element. .
.;. .
~;. This previously proposed vaporizer has the disadvantage .
: 20 that it provided inefficient utilization of.the electrical power .. .
:~ employed for energizing the heating element. To vaporize the fuel trapped in the pockets, heat from the heating element must .
be transferred by condu~tion -through the sleeve exten~ing around the lower end of the tube, and thence to the plate and flanges forming the pockets, and since the plate and.fl~anges are of .
relatively thin metal, these parts cannot retain a large amount ` of heat.
The present invention is based on the concept that, in order to avoid undesirably.high electricalpower consumption, , 30 which would adversely affect the battery of the vehicle in which 7 : ~
the vaporizer is provided and would cause tempera~ure control problems, the vaporizer should include means by which heat from . a low.power electrical resistance heater can be accumulated over a period of time prior to starting of the engine.
It is accordingly an object of the present invention to provide an improved fuel vaporizer which promotes efficient .. starting of an internal combustion engine but which requires ;. less electrical power than prior art fuel vaporizers.
~ According to the present invention,there is provided .. ~ I
. 10 a fuel vaporizer for the intake manifold of an internal com-bustion engine, comprising a heat reservoir, a low power , electrical resistance h~ater embedded in the heak reservoir, j elongate support means for supporting the heat reservoir in ~ the intake manifold of the internal combustion engine, the heat . reservoir comprising a block of a heat conductive material pro-.~ jecting laterally from the support means, and the block having ~: an upwardly facing fuel impingement surface, and electrical ~: .
. current supply conductor means for supplying an electrical :
.. current to the electrical resistance heàter. ;
~ 20 Preferably, the vaporizer is urther provided with `` switch means for connecting an electrical current supply source :.
:
.. to the supply conductor means independently of the ignition .~'''.i ' .. i switch of the internal combustion engine,.and means responsive .;j, ~ to starting of the internal combustion engine for interrupting !'"~ the current suppl.y through the supply conductor~.means when the .O internal combustion engine is started.
The invention will be more readily understood from . " . :.
the fol~owing description of the preferred .embodiment thereof ~.~ given, by way of example, with reference to the accompanying .3 .~ 30 drawings, in ~hich~
:~ ;
. i , .
'. , : ,~
;i ` ' . , ' :' . i .
Figure 1 shows a partially broken-away view in per-spective of a uel vaporizer arrangement embodying the present invention and secured to a gasket positioned between a car-.^. .
burettor and an intake manifold of an internal combustion engine;
... .
Figure 2 shows a view in perspective of one of the fuel vaporizers of Figure 1 in greater detail;
~- Figure 3 shows a diagrammatic view in vertical section I^! through the intake manifold, with the carburettor and gasket : .
; secured thereto; and .. . . .
Figure 4 shows a circuit diagram of the fue1 vaporizer.
.~, 1:, Reerring firstly to Figure 1 of the accompanying drawings, there is illustrated in this drawing an intake mani- I
!
fold lO of an internal combustion engine provided with a car-burettor, of which the bottom flange is indicated by reference numeral 11.
A gasket 12 is shaped to fit between the top of the ¦ -~ intake manifold 10 and the underside of the carburettor flange ; 11, these parts being secured together by securing screws in the conventional manner.
~,~ . . I
The gasket 12 has at its inner side two downwardly ,~ extending support tubes 14. More particularly, the upper end ¦
;~ of each support tube 14 extends horizontally into the gasket 12, A" " in which it is supported. I;
,,.. ~,~ , , . , :
~ Each support tube 14 is shaped to extend vertically .- i . , .
downwardly into the intake manifold 10 and is secured at its lowermost end to a disc-shaped héat reservoir in the-form of a block 15 of brass or other suitable heat conductive material.
~ .~., . . I
~;~ As can be seen more clearly from Figure 2,~the block 15 is formed at its upper side with a flat, upwardly facing fuel impingement surface 17 surrounded by an upstanding, annular rim '~! ' ' ' ., ",,,~ , , , ', ' , ~ - 3 -:: -.
. ~ . . . . . .
18 and provided with a plurality of fuel-containing recesses ~
19. ~':' ;' . A cylindrical heater uni~ 16 is secursd at one ~:
." end to a cylindrical brass button 13, and the heater unit ,. ~
.. 16 and the brass button are f.itted into corresponding . . ~
transverse borings in the block 15 and :retained therein ~,i by a grub screw 22 in threaded engagement with a further . ~:
' boring 23 in the block 15. The lower end of the support ,, .
~. tube 14 is soldered to the brass button 13.
;' 10 AS can be seen from Figures 1, 2 and 3, the block ..
15 projects laterally Prom the vertical support pipe 14 into .~/!, the path of the stream of liquid fuel, indicated by `,~ reference numeral 20 in Figure 2, from the carburettor.
. Also, as can be seen from Figure 3, the suppork .... j. tube 14 supports the block 15 slightly above the bottom ~ of the intake manifold flow passage beneath the carburettor, ~ ~
,`. so that the fuel vaporizer does not obstruct the airflow .:.
.~ indicated by arrows 21 in Figure 2.
. . , ~: Figure 4 shows two heater elements 25 of respect-:ive heater units 16. The heater elements 25 are connected, . :
: ., :~i by leads 24 extending through the support tubes 14, in .;, , parallel with one another between vehicle ground and one contact of a normally-closed relay switch R, the other con-.~ tact of which is connected, by conductor 26, through a ,.,~ . .
~ manually-operable switch 27 to a vehicle battery (not shown). .
:~ An indicator lamp L connected between ground and :
the connector 26, i.e. in parallel with the heater elements ` ? 25, serves to provide a visual indication of closure of . ~.
., --., .
the manually-operable switch 27 and of the operation of the relay R. :.
''~ ' ' .
-:. - 4 _ :,~ ,, .
, ,, :~ .
: :,, r. ;~
.~4~ 39~
The relay R comprises a coil 28 connected at one end ` to ground and at its opposite end, through a Zener diode 29, to a conventional alternator 30.
~` The operation of the above-describ,ed apparatus is as follows:-Prior to starting of an engine in which the apparatus is provided, the manually-operable switch 27 is closed to ener-gize the heater elements 25. After a suitable period of time, during which the block 15 is sufficiently heated by the heater elements 25, the engine of the vehicle i5 ready to be started.
; The accelerator pedal of the vehicle is depressed ... .
several times in accordance with the vehicle manu~acturers in-~, structions. The liquid fuel stream 20 from the carburettor acceleration pump impinges on the block 15, and is vapourlzed.
The engine starter is then engaged and, after the engine has started and is idling, the voltage of the alternator 30 reaches a value sufficient to energize the coil 28 and to thereby open ~` the normally-closed contacts of the relay switch R. The lamp L
is de-energized, which indicates-that the relay switch R has .~, ~ 20 interrupted the current supply to the heater elements 25.
,., .
. ., .
. ~ , ~., , '"
' ,.! I
' ~ ' ) ;
'''`i , I
, ~ ' r :~, 30 . .` . ,.
: ` , -- S --, ~ :
The present invention relates to a fuel vaporizer for the intake manifold of an.internal combustion engine equipped with a downdraft carburektor.
It has previously been proposed to provide a fuel : vaporizer for heating fuel discharged from a carburettor into the intake manifold of an internal combustion engine, particularly for use in cold climatic conditions.
. For example, United States Patent 2,597,251 teaches a fuel vaporizer comprising a tube containing an insulated heating -: 10- element and extending downwardly within a manifold intake from a retaining frame or band sandwiched between gaskets between a . carburettor flange and the manifold intake. The lower end of ~:i the tube is provided with a fuel trap consisting of a sleeve .~ mounted on the tube and extending downwardly to a hQrizontal plate having an annular upstanding peripheral flange and divided .
by a plurality of further flanges into pockets in which incoming ;
.. . fuel is trapped and vaporized by heat generated by the heating ''-J, element. .
.;. .
~;. This previously proposed vaporizer has the disadvantage .
: 20 that it provided inefficient utilization of.the electrical power .. .
:~ employed for energizing the heating element. To vaporize the fuel trapped in the pockets, heat from the heating element must .
be transferred by condu~tion -through the sleeve exten~ing around the lower end of the tube, and thence to the plate and flanges forming the pockets, and since the plate and.fl~anges are of .
relatively thin metal, these parts cannot retain a large amount ` of heat.
The present invention is based on the concept that, in order to avoid undesirably.high electricalpower consumption, , 30 which would adversely affect the battery of the vehicle in which 7 : ~
the vaporizer is provided and would cause tempera~ure control problems, the vaporizer should include means by which heat from . a low.power electrical resistance heater can be accumulated over a period of time prior to starting of the engine.
It is accordingly an object of the present invention to provide an improved fuel vaporizer which promotes efficient .. starting of an internal combustion engine but which requires ;. less electrical power than prior art fuel vaporizers.
~ According to the present invention,there is provided .. ~ I
. 10 a fuel vaporizer for the intake manifold of an internal com-bustion engine, comprising a heat reservoir, a low power , electrical resistance h~ater embedded in the heak reservoir, j elongate support means for supporting the heat reservoir in ~ the intake manifold of the internal combustion engine, the heat . reservoir comprising a block of a heat conductive material pro-.~ jecting laterally from the support means, and the block having ~: an upwardly facing fuel impingement surface, and electrical ~: .
. current supply conductor means for supplying an electrical :
.. current to the electrical resistance heàter. ;
~ 20 Preferably, the vaporizer is urther provided with `` switch means for connecting an electrical current supply source :.
:
.. to the supply conductor means independently of the ignition .~'''.i ' .. i switch of the internal combustion engine,.and means responsive .;j, ~ to starting of the internal combustion engine for interrupting !'"~ the current suppl.y through the supply conductor~.means when the .O internal combustion engine is started.
The invention will be more readily understood from . " . :.
the fol~owing description of the preferred .embodiment thereof ~.~ given, by way of example, with reference to the accompanying .3 .~ 30 drawings, in ~hich~
:~ ;
. i , .
'. , : ,~
;i ` ' . , ' :' . i .
Figure 1 shows a partially broken-away view in per-spective of a uel vaporizer arrangement embodying the present invention and secured to a gasket positioned between a car-.^. .
burettor and an intake manifold of an internal combustion engine;
... .
Figure 2 shows a view in perspective of one of the fuel vaporizers of Figure 1 in greater detail;
~- Figure 3 shows a diagrammatic view in vertical section I^! through the intake manifold, with the carburettor and gasket : .
; secured thereto; and .. . . .
Figure 4 shows a circuit diagram of the fue1 vaporizer.
.~, 1:, Reerring firstly to Figure 1 of the accompanying drawings, there is illustrated in this drawing an intake mani- I
!
fold lO of an internal combustion engine provided with a car-burettor, of which the bottom flange is indicated by reference numeral 11.
A gasket 12 is shaped to fit between the top of the ¦ -~ intake manifold 10 and the underside of the carburettor flange ; 11, these parts being secured together by securing screws in the conventional manner.
~,~ . . I
The gasket 12 has at its inner side two downwardly ,~ extending support tubes 14. More particularly, the upper end ¦
;~ of each support tube 14 extends horizontally into the gasket 12, A" " in which it is supported. I;
,,.. ~,~ , , . , :
~ Each support tube 14 is shaped to extend vertically .- i . , .
downwardly into the intake manifold 10 and is secured at its lowermost end to a disc-shaped héat reservoir in the-form of a block 15 of brass or other suitable heat conductive material.
~ .~., . . I
~;~ As can be seen more clearly from Figure 2,~the block 15 is formed at its upper side with a flat, upwardly facing fuel impingement surface 17 surrounded by an upstanding, annular rim '~! ' ' ' ., ",,,~ , , , ', ' , ~ - 3 -:: -.
. ~ . . . . . .
18 and provided with a plurality of fuel-containing recesses ~
19. ~':' ;' . A cylindrical heater uni~ 16 is secursd at one ~:
." end to a cylindrical brass button 13, and the heater unit ,. ~
.. 16 and the brass button are f.itted into corresponding . . ~
transverse borings in the block 15 and :retained therein ~,i by a grub screw 22 in threaded engagement with a further . ~:
' boring 23 in the block 15. The lower end of the support ,, .
~. tube 14 is soldered to the brass button 13.
;' 10 AS can be seen from Figures 1, 2 and 3, the block ..
15 projects laterally Prom the vertical support pipe 14 into .~/!, the path of the stream of liquid fuel, indicated by `,~ reference numeral 20 in Figure 2, from the carburettor.
. Also, as can be seen from Figure 3, the suppork .... j. tube 14 supports the block 15 slightly above the bottom ~ of the intake manifold flow passage beneath the carburettor, ~ ~
,`. so that the fuel vaporizer does not obstruct the airflow .:.
.~ indicated by arrows 21 in Figure 2.
. . , ~: Figure 4 shows two heater elements 25 of respect-:ive heater units 16. The heater elements 25 are connected, . :
: ., :~i by leads 24 extending through the support tubes 14, in .;, , parallel with one another between vehicle ground and one contact of a normally-closed relay switch R, the other con-.~ tact of which is connected, by conductor 26, through a ,.,~ . .
~ manually-operable switch 27 to a vehicle battery (not shown). .
:~ An indicator lamp L connected between ground and :
the connector 26, i.e. in parallel with the heater elements ` ? 25, serves to provide a visual indication of closure of . ~.
., --., .
the manually-operable switch 27 and of the operation of the relay R. :.
''~ ' ' .
-:. - 4 _ :,~ ,, .
, ,, :~ .
: :,, r. ;~
.~4~ 39~
The relay R comprises a coil 28 connected at one end ` to ground and at its opposite end, through a Zener diode 29, to a conventional alternator 30.
~` The operation of the above-describ,ed apparatus is as follows:-Prior to starting of an engine in which the apparatus is provided, the manually-operable switch 27 is closed to ener-gize the heater elements 25. After a suitable period of time, during which the block 15 is sufficiently heated by the heater elements 25, the engine of the vehicle i5 ready to be started.
; The accelerator pedal of the vehicle is depressed ... .
several times in accordance with the vehicle manu~acturers in-~, structions. The liquid fuel stream 20 from the carburettor acceleration pump impinges on the block 15, and is vapourlzed.
The engine starter is then engaged and, after the engine has started and is idling, the voltage of the alternator 30 reaches a value sufficient to energize the coil 28 and to thereby open ~` the normally-closed contacts of the relay switch R. The lamp L
is de-energized, which indicates-that the relay switch R has .~, ~ 20 interrupted the current supply to the heater elements 25.
,., .
. ., .
. ~ , ~., , '"
' ,.! I
' ~ ' ) ;
'''`i , I
, ~ ' r :~, 30 . .` . ,.
: ` , -- S --, ~ :
Claims (9)
1. A fuel vaporizer for an intake manifold of an in-ternal combustion engine, comprising:
a heat reservoir, a low power electrical resistance heater embedded in said heat reservoir, elongate support means for supporting said heat reser-voir in the intake manifold of the internal combustion engine, said heat reservoir comprising a block of heat con-ductive material projecting laterally from said support means, and said block having an upwardly facing fuel impingement surface, and electrical current supply conductor means for supplying an electrical current to said electrical resistance heater.
a heat reservoir, a low power electrical resistance heater embedded in said heat reservoir, elongate support means for supporting said heat reser-voir in the intake manifold of the internal combustion engine, said heat reservoir comprising a block of heat con-ductive material projecting laterally from said support means, and said block having an upwardly facing fuel impingement surface, and electrical current supply conductor means for supplying an electrical current to said electrical resistance heater.
2. A fuel vaporizer as claimed in claim 1, further com-prising switch means for connecting an electrical current supply source to said supply conductor means independently of the igni-tion switch of the internal combustion engine, and means respon-sive to starting of the internal combustion engine for interrupt-ing the current supply through said supply conductor means when the internal combustion engine is started.
3. A fuel vaporizer as claimed in claim 1, wherein said block has an upstanding rim extending around said fuel impingement surface.
4. A fuel vaporizer as claimed in claim 1, wherein said block defines a plurality of liquid fuel collecting recesses in said fuel impingement surface.
5. A fuel vaporizer as claimed in claim 2, wherein said engine responsive means comprise a relay switch for connection to an alternator, the relay switch having normally closed contacts in said current supply conductor means, whereby said relay switch contacts open to discontinue the current supply in response to driving of the alternator upon starting of the engine.
6. In an intake manifold of an internal combustion engine, a fuel vaporizer for assisting starting of said engine, said fuel vaporizer comprising:
a heat sink for storing heat for vaporizing the engine fuel, a low power electrical resistance heater embedded in said heat sink, gasket means for mounting between the carburettor and the intake manifold of said internal combustion engine, elongate support means for supporting said heat sink in the intake manifold and comprising an elongate support member, said support means having an upper end thereof secured is said gasket means and a lower end thereof secured to said heat sink and positioning said heat sink at the bottom of the flow passage of said manifold below said carburettor, said heat sink comprising a block of heat conductive material projecting laterally from said support means into the path of the liquid fuel from said carburettor, said block having an upwardly facing fuel impingement surface, and electrical current supply conductor means extending through said gasket means and said supporting means for supplying an electrical current to said electrical resistance heater.
a heat sink for storing heat for vaporizing the engine fuel, a low power electrical resistance heater embedded in said heat sink, gasket means for mounting between the carburettor and the intake manifold of said internal combustion engine, elongate support means for supporting said heat sink in the intake manifold and comprising an elongate support member, said support means having an upper end thereof secured is said gasket means and a lower end thereof secured to said heat sink and positioning said heat sink at the bottom of the flow passage of said manifold below said carburettor, said heat sink comprising a block of heat conductive material projecting laterally from said support means into the path of the liquid fuel from said carburettor, said block having an upwardly facing fuel impingement surface, and electrical current supply conductor means extending through said gasket means and said supporting means for supplying an electrical current to said electrical resistance heater.
7. A fuel vaporizer as claimed in claim 6, further comprising normally closed switch means in said electrical current supply means for controlling the current supply to said heater means, and means responsive to starting of said engine for opening said normally closed switch means.
8. A fuel vaporizer as claimed in claim 6, wherein said block has an upstanding rim extending around said fuel impingement surface.
9. A fuel vaporizer as claimed in claim 6, wherein said block defines a plurality of liquid fuel collecting recesses in said fuel impingement surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA247,063A CA1041392A (en) | 1976-03-03 | 1976-03-03 | Fuel vaporizer for internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA247,063A CA1041392A (en) | 1976-03-03 | 1976-03-03 | Fuel vaporizer for internal combustion engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1041392A true CA1041392A (en) | 1978-10-31 |
Family
ID=4105375
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA247,063A Expired CA1041392A (en) | 1976-03-03 | 1976-03-03 | Fuel vaporizer for internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1041392A (en) |
-
1976
- 1976-03-03 CA CA247,063A patent/CA1041392A/en not_active Expired
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