EP4045788A1 - Protecteur de nez d'injecteur direct d'essence avec bouclier thermique - Google Patents
Protecteur de nez d'injecteur direct d'essence avec bouclier thermiqueInfo
- Publication number
- EP4045788A1 EP4045788A1 EP20788806.6A EP20788806A EP4045788A1 EP 4045788 A1 EP4045788 A1 EP 4045788A1 EP 20788806 A EP20788806 A EP 20788806A EP 4045788 A1 EP4045788 A1 EP 4045788A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- injector
- cylinder head
- thermal control
- fuel
- heat shield
- 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.)
- Withdrawn
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
- F02M53/00—Fuel-injection apparatus characterised by having heating, cooling or thermally-insulating means
- F02M53/04—Injectors with heating, cooling, or thermally-insulating means
- F02M53/046—Injectors with heating, cooling, or thermally-insulating means with thermally-insulating means
-
- 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
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/14—Arrangements of injectors with respect to engines; Mounting of injectors
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- 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
- F02M43/00—Fuel-injection apparatus operating simultaneously on two or more fuels, or on a liquid fuel and another liquid, e.g. the other liquid being an anti-knock additive
Definitions
- the present invention relates to the cooling of a gasoline injector for a heat engine of a motor vehicle, in particular a dual-fuel engine.
- the present invention also relates to the cooling of the environment of the gasoline injector of the heat engine.
- the present invention relates more particularly to a thermal protection device for the gasoline injector nose for a dual-fuel engine.
- a thermal or internal combustion engine can be powered by two types of fuel which are generally gasoline and gas known by the acronym of NGV for natural gas for vehicles.
- the two fuels are injected into a combustion chamber of the engine.
- the combustion chamber in known manner is delimited by the wall of a cylinder hollowed out in a cylinder block, a lower face of a cylinder head fixed against a parting line on the upper face of the cylinder block, and a piston movable in sliding along the axis of the cylinder in a reciprocating movement.
- the fuel is injected into the combustion chamber using an injector which is fixed in the cylinder head with an injection nozzle opening from the underside of the cylinder head into the combustion chamber.
- an injector which is fixed in the cylinder head with an injection nozzle opening from the underside of the cylinder head into the combustion chamber.
- a known problem is the coking of the fuel in the injector with the destruction of the seal on the injector nose and also the destruction of the possible coating on the injector ball following a defect. thermal protection and / or cooling of the injector nose. It is also known to operate the dual-fuel engine with only one of the two fuels at a given time. More simply, only one of the two fuels is injected into the combustion chamber at a given time.
- the first fuel which may be gasoline
- the injector of the first fuel is subjected to very high temperatures and must be cooled accordingly. The most obvious way is to transfer a maximum of calories to the cylinder head which has a cooling circuit.
- the publications FR2906576-A1 and FR 2907854-A1 propose an arrangement for cooling an injector in a housing of an engine element, said arrangement comprising a stack of washers or helical coils of spring surrounding said injector and disposed in the housing intended to accommodate the injector.
- maintaining the stack in the housing results in strong tapping constraints to ensure contact of the stack on the one hand with the injector and on the other hand with the wall of the housing, and holding in position. of the stack with relative expansions of each of the components in contact, that is to say the injector, the stack and the wall of the cylinder head.
- a thermal injector protection device comprising a metallic tubular sock inserted by hooping into the housing of the injector, said tubular sock being adapted to surround the downstream endpiece facing the combustion chamber of the injector, on the one hand to protect said injector from rising gas and on the other hand to transfer heat to the cylinder head.
- the publication FR2473118-A1 discloses a device for protecting a nose of a fuel injector of a heat engine composed of a sleeve having an annular lip arranged vis-à-vis the combustion chamber and a locking ring. thermal protection arranged between said lip and the end part or injector nose.
- a drawback is that the protection device relates to an injector for a mono-carburetion engine and does not include heat removal means to avoid an excessive rise in temperature of the environment of the injector nose which could lead to auto. -inflammations causing knocking phenomena.
- the object of the invention is to remedy the problems cited in the prior art and one of the objects of the invention is a device for protecting an injection end of a fuel injector arranged in a cylindrical housing hollowed out in a cylinder head of a dual-fuel engine, said device is suitable for surrounding said injection end and pushed into the housing of the cylinder head.
- the present invention relates more particularly to a thermal control device of an injection end of a fuel injector arranged in a cylindrical housing hollowed out in a cylinder head of a dual-fuel engine and opening into a combustion chamber, said device comprises a tubular capsule with high thermal conductivity cooperating via its cylindrical wall with the cylinder head, capable of surrounding said injection end and pressed with contact into the housing of the cylinder head,
- the device comprises a heat shield covering the injection end of the injector.
- the protection device comprises a capsule with high thermal conductivity and cooperating through its cylindrical wall with the cylinder head to rapidly transfer the heat accumulated at the injection end of the injector to the cylinder head in which a circuit is hollowed out. cooling.
- the device comprises a heat shield or shield covering the injection end of the injector, capable of accumulating heat at the nose of the injector in order to transfer it to the cylinder head via the capsule with high thermal conductivity.
- the capsule has its outer cylindrical wall resting against the cylinder head.
- the first element is capable of exchanging heat with the cylinder head over its entire cylindrical wall, which allows said heat to be conveyed optimally.
- the capsule comprises a tubular sleeve extended by a radial annular lip to surround the end of the injector.
- the capsule makes it possible to cover the injection end of the injector in a simple manner, the outer wall of the sleeve being adapted to be mounted in contact with the cylinder head in the cylindrical housing.
- the heat shield comprises an insulating flat washer disposed between the annular lip and the end of the injector resting against the radial lip over its entire radial surface.
- the heat shield makes it possible to optimally insulate the injection end of the injector and to prevent too great a rise in temperature of this end. It can be formed of a flat washer which is mounted to bear against the radial lip to allow optimal heat transfer between the heat shield and the cylinder head thanks to the first element of high thermal conductivity.
- the heat shield is made of a material of high resistivity, in particular ceramic.
- the heat shield is ceramic of high thermal resistivity to allow blocking of heat generated from the combustion chamber towards the injection end of the injector.
- the capsule is part of the cylinder head.
- the capsule is part of the cylinder head. It is attached for example by shrinking its outer cylindrical wall in the cylindrical housing in the cylinder head to optimize the heat transfers between the capsule and the cylinder head.
- FIG. 1 is a schematic sectional view of a combustion engine cylinder head.
- FIG. 2 is a schematic sectional view of the cylinder head with a conduit for housing a fuel injector nozzle.
- a heat engine in particular for a motor vehicle, comprises a cylinder block surmounted by a cylinder head.
- the cylinder block comprises cylindrical barrels in each of which a piston slides in a reciprocating movement.
- a combustion chamber is then delimited by the piston, the wall of the barrel or cylinder and the lower part of the cylinder head.
- Fresh air which can be mixed with recirculated flue gases is admitted into said combustion chamber through intake channels.
- fuel is admitted to the same combustion chamber through an injector. After combustion, the burnt gases are expelled through exhaust channels and join an exhaust circuit.
- the invention relates to a thermal or internal combustion engine with dual fuel, that is to say accepting two different types of fuel, for example a liquid fuel which may be gasoline and a gaseous fuel which may be gas. for vehicle known by the acronym of "NGV”.
- a liquid fuel which may be gasoline
- a gaseous fuel which may be gas. for vehicle known by the acronym of "NGV”.
- the engine thus has two fuel inlet pipes corresponding to the two fuels used.
- Our description is for a gasoline and gas-based engine, but the invention may relate to a dual-fuel engine with other fuels.
- the subject of the invention is a device for protecting the injection end of an injector of a first fuel against the risk of excessive heating of said injection end, in particular when the engine is operating with the second. fuel. Said risks can for example lead to high temperature points which can generate auto-ignition or knocking leading to engine failures.
- said injector 100 is fixed to the cylinder head 101 and has a cylindrical body 102 with a nozzle 103 or injector nose disposed downstream according to the direction of flow of the fuel.
- the injector is attached to the cylinder head and is driven into a through channel 50 dug in the cylinder head and opening into the combustion chamber.
- Said through channel 50 comprises a housing 10 of the nozzle 103 of the injector, said housing 10 is substantially cylindrical along a rectilinear axis X and opens into the combustion chamber 104.
- a cooling circuit 105 is hollowed out comprising channels 106 for circulating coolant which pass preferably next to hot or particularly hot areas or requiring cooling of the cylinder head during engine operation.
- channels 106 for circulating coolant which pass preferably next to hot or particularly hot areas or requiring cooling of the cylinder head during engine operation.
- the object of the invention is the thermal control of the injection end 107 of the injector 100 facing the combustion chamber and relates more particularly to a thermal control device 70 to prevent excessive temperature rise of said. injection end 107.
- the device 70 must form a thermal protection shield for said end against the heat generated in the combustion chamber, in particular during operation of the engine with the second fuel.
- the device 70 comprises a capsule 11 formed by a tubular sleeve 12 extended by a radial lip 14.
- the tubular sleeve is adapted to cooperate with the housing 10 of the cylinder head, that is to say that the outer cylindrical wall 15 of the sleeve 12 bears against the inner wall 13 of the housing 10 when the sleeve is mounted.
- the capsule is part of the cylinder head 101: it is attached by hooping in the housing 10 of the cylinder head.
- the sleeve is extended by a radial lip 14 which extends towards the X axis of the sleeve.
- the lip 14 is annular to allow the outlet 108 of the injector 100. Said radial lip opens from the housing 10 into the combustion chamber 104.
- the capsule 11 is adapted to surround the injection end 107 of the injector.
- the capsule 11 has characteristics of high thermal conductivity to allow heat transfer to the cylinder head and in particular to the cooling liquid circulation channels 106. It is for example formed from an alloy of iron and copper or copper and beryllium.
- the device 70 comprises an annular thermal protection washer 17 having an internal section suitable for the outlet 108 of the injector.
- the diameter of the internal section of the washer 17 is substantially equal to the internal diameter of the radial lip 14 of the capsule 11.
- the washer 17 is made of a material having a high thermal resistivity, for example ceramic.
- the washer 17 is a protective heat shield or shield capable of blocking the heat coming from the combustion chamber 104.
- the washer is mounted to bear over its entire lower radial surface 18 against the radial lip 14. It is also possible to deposit a layer of metal deposit to improve the contact between the two surfaces.
- the injector 100 is mounted to bear against the upper radial surface 19 of the washer 17.
- the injector 100 When operating the engine on the second fuel, the injector 100 is deactivated and is not cooled by the passage of the first fuel.
- the heat generated in the combustion chamber is blocked by the washer 17 and accumulates in particular on the lower surface 18 which bears against the radial lip 16. Said heat is then transferred by the capsule 11 with high thermal conductivity towards the wall. cylindrical 15 from the sleeve and then to the cylinder head and to the circulation channels. Heat therefore does not accumulate at the injection end 107 of the injector 100.
- the thermal control device 70 makes it possible to control the heat generated in the combustion chamber by blocking it at the level of the insulating washer 17 and to evacuate said heat and therefore to avoid an accumulation of heat. and an increase in the temperature at the injection end of the injector.
- the capsule 11 may be part of the injector. It can for example be mounted around the injector.
- the injector then includes a screen or heat shield at its injection end.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1911394A FR3101920B1 (fr) | 2019-10-14 | 2019-10-14 | Protecteur de nez d’injecteur direct d’essence avec bouclier thermique |
| PCT/EP2020/078552 WO2021074053A1 (fr) | 2019-10-14 | 2020-10-12 | Protecteur de nez d'injecteur direct d'essence avec bouclier thermique |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4045788A1 true EP4045788A1 (fr) | 2022-08-24 |
Family
ID=69104756
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP20788806.6A Withdrawn EP4045788A1 (fr) | 2019-10-14 | 2020-10-12 | Protecteur de nez d'injecteur direct d'essence avec bouclier thermique |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP4045788A1 (fr) |
| FR (1) | FR3101920B1 (fr) |
| WO (1) | WO2021074053A1 (fr) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3000061C2 (de) | 1980-01-03 | 1993-10-14 | Bosch Gmbh Robert | Kraftstoffeinspritzdüse für Brennkraftmaschinen |
| JPH1089192A (ja) * | 1996-09-10 | 1998-04-07 | Toyota Central Res & Dev Lab Inc | デポジット低減式燃料噴射弁 |
| DE10354465B4 (de) * | 2003-11-21 | 2014-07-17 | Robert Bosch Gmbh | Brennstoffeinspritzventil |
| JP2007162678A (ja) * | 2005-11-16 | 2007-06-28 | Toyota Motor Corp | 燃料噴射弁 |
| FR2906576B1 (fr) | 2006-10-03 | 2011-03-04 | Renault Sas | Agencement de refroidissement d'un injecteur comportant un empilement de rondelles. |
| FR2907854B1 (fr) | 2006-10-25 | 2008-12-26 | Renault Sas | Agencement de refroidissement d'un injecteur comportant deux ressorts imbriques l'un dans l'autre |
-
2019
- 2019-10-14 FR FR1911394A patent/FR3101920B1/fr not_active Expired - Fee Related
-
2020
- 2020-10-12 WO PCT/EP2020/078552 patent/WO2021074053A1/fr not_active Ceased
- 2020-10-12 EP EP20788806.6A patent/EP4045788A1/fr not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| WO2021074053A1 (fr) | 2021-04-22 |
| FR3101920B1 (fr) | 2022-04-15 |
| FR3101920A1 (fr) | 2021-04-16 |
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