GB2270346A - I.C.engine dual fuel injection unit - Google Patents
I.C.engine dual fuel injection unit Download PDFInfo
- Publication number
- GB2270346A GB2270346A GB9218887A GB9218887A GB2270346A GB 2270346 A GB2270346 A GB 2270346A GB 9218887 A GB9218887 A GB 9218887A GB 9218887 A GB9218887 A GB 9218887A GB 2270346 A GB2270346 A GB 2270346A
- Authority
- GB
- United Kingdom
- Prior art keywords
- gas
- fuel
- nozzle body
- supply unit
- combustion chamber
- 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- Withdrawn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
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02M21/0248—Injectors
- F02M21/0251—Details of actuators therefor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
- F02D19/0663—Details on the fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02D19/0686—Injectors
- F02D19/0694—Injectors operating with a plurality of fuels
-
- 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
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02M21/0248—Injectors
- F02M21/0257—Details of the valve closing elements, e.g. valve seats, stems or arrangement of flow passages
- F02M21/026—Lift valves, i.e. stem operated valves
- F02M21/0263—Inwardly opening single or multi nozzle valves, e.g. needle valves
-
- 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
- F02M43/04—Injectors peculiar thereto
-
- 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
- Y02T10/30—Use of alternative fuels, e.g. biofuels
Abstract
A liquid fuel injection nozzle includes a body 10 and a fuel pressure actuated valve member 19 and a gas nozzle includes a tubular valve member 37 bearing on the nozzle body. The valve member 37 is spring biased into engagement with a seating surface 29 defined on a valve plate 28 carried within a cap nut 25 and is lifted from the surface by fluid pressure to allow gas to flow to gas outlets 35 formed in an orifice plate 33 which is carried on the outside of the cap nut. <IMAGE>
Description
FUEL SUPPLY UNIT
This invention relates to a dual fuel supply unit for supplying fuel to a combustion chamber of a compression ignition engine and of the kind comprising a liquid fuel injection nozzle including a fuel pressure actuated valve member through which at least a limited quantity of liquid fuel can be supplied to the combustion chamber to achieve generation of a flame within the combustion chamber and a gas nozzle through which gaseous fuel can be admitted to the combustion chamber, the gaseous fuel being ignited by the flame established in the combustion chamber by the injection of liquid fuel.
The object of the invention is to provide such a fuel supply unit in a simple and convenient form.
According to the invention a fuel supply unit for the purpose specified comprises a nozzle body which houses the valve member of the fuel injection nozzle, and a tubular member slidably supported about a bearing surface defined by the nozzle body, said tubular member forming part of a gas control valve of the gas nozzle.
According to a further feature of the invention said tubular member is biased to the valve closed position by resilient means and is urged to the open position by fluid under pressure which is applied to an end surface of an annular piston slidable about a surface defined on said nozzle body.
According to a further feature of the invention the nozzle body is held in engagement with a spacer member by means of a cap nut and there is interposed between a step on the nozzle body and an inwardly directed flange on the cap nut, an annular valve plate a surface of which defines a seating surface for engagement by an end surface of said tubular member.
According to a further feature of the invention the end surface of said cap nut adjacent said flange carries an orifice plate in which is formed a plurality of gas outlet orifices, the flange defining a gas conveying duct through which gas can flow to said orifices when the tubular member is lifted from the seating surface.
An example of a fuel supply unit in accordance with the invention will now be described with reference to the accompanying drawings in which:
Figure 1 is a sectional side elevation of part of the fuel supply unit,
Figure 2 is a view to an enlarged scale of part of the unit seen in Figure 1, and
Figure 3 is a diagram showing the fluid connections to the unit.
Referring to the drawings the supply unit comprises a liquid fuel injection nozzle which includes a nozzle body 10 of stepped cylindrical form having an end surface which is held in sealing engagement with an end surface of a spacer member 11. The opposite end face of the spacer member 11 is held in sealing engagement with a holder 12.
Within the nozzle body there is formed a bore 13 which extends inwardly from the surface which engages the spacer member and terminates in a seating 14. Beyond the seating there is defined a sac volume 15 from which extends a plurality of liquid fuel outlet orifices 16.
Intermediate the ends of the bore there is formed an enlargement 17 which is connected to a fuel supply passage 18, the passage extending within the spacer member 11 to a passage in the holder 12 connected to a fuel inlet. The fuel inlet in use is connected to a high pressure fuel supply pump of conventional construction.
Slidable within the bore 13 is a valve member 19 the portion of the valve member which lies between the enlargement 17 and the seating 14 being of smaller diameter than the bore. The end of the valve member is shaped for cooperation with the seating and the valve member is biased into contact with the seating by means of a coiled compression spring 20 which is housed within an axial drilling 21 formed in the holder. The connection between the spring and the valve member is by means of a spring abutment 22 having an integral extension 23 which engages with an extension of the valve member. When fuel under pressure is supplied to the passage 18 the fuel pressure acts upon the valve member to develop a force which opposes the force exerted by the spring 20 and when the force is sufficient, the valve member moves away from the seating to allow fuel flow through the outlet orifices 16.The extent of movement of the valve member away from the seating is limited by the engagement of the end of the valve member with the surface of the spacer member 11 which is engaged by the nozzle body and the force exerted by the spring can be adjusted by means of an adjustable abutment 24 housed in the holder 12. The drilling 21 in which the spring is located, is vented to a low pressure by means of passages within the abutment.
The various faces of the holder 12, the spacer member 11 and the nozzle body 10 are held in engagement by means of a cap nut 25 which is in screw thread engagement with the holder 12. The cap nut has an inwardly directed flange 26 and interposed between the flange 26 and a step 27 defined on the nozzle body is an annular valve plate 28. A portion of the valve plate projects outwardly of the nozzle body and defines a seating surface 29 in which is formed an annular groove 30. Moreover, in the face of the valve plate remote from the seating surface there is formed a further annular groove 31 and the grooves 30 and 31 are interconnected by means of a plurality of holes 32. The end portion of the flange is recessed and carries an orifice plate 33.
Conveniently the orifice plate is electron beam welded to the surfaces of the flange and defined between the orifice plate and the cap nut is a fuel gallery 34 from which extends a plurality of gas outlets 35. The groove 31 and the gallery 34 are interconnected by means of a plurality of ducts 36 formed in the flange 26 and the number of ducts 36 is in the particular example, different to the number of holes 32 but this is not always the case. For example, in a modification the grooves 31 and 34 can be dispensed with and the ducts 36 aligned with the holes 32 which are in turn aligned with the outlets 35. Dowels may be provided to ensure the alignment.
The valve plate 28 forms part of the gas nozzle and a further part of the nozzle is a tubular valve member generally indicated at 37 and which has a skirt portion 38 movable with clearance within a gap defined between the cap nut 25 and the nozzle body 10. The end surface of the skirt portion 38 is engagable with the seating surface 29 of the valve plate to cover the groove 30. In addition, the skirt portion intermediate its ends is provided with apertures 39. The valve member 37 includes a bearing portion 40 which is in sliding engagement with an enlarged portion 41 of the nozzle body. As will be more clearly seen from Figure 1, the bearing portion 40 extends beyond the enlarged portion 41 of the nozzle body and it defines an external step 42 which is engaged by a coiled compression spring 43.The opposite end of the coiled compression spring is in engagement with an abutment 44 and this in turn is provided with an integral hollow cylindrical extension 45 which extends alongside the external surface of the spacer member and partly alongside the external surface of the nozzle body.
The end of the extension 45 together with the enlarged portion 41 of the nozzle body form the end surfaces of an annular cylinder 46 in which is slidable an annular piston 47 the internal and external surfaces of which are a good sliding fit with the nozzle body and the valve member.
The piston 47 is coupled to the valve member by means of a circlip 48 which fits into a internal groove in the valve member. A plurality of holes 48A provide access for tooling pins which can be used to compress the circlip to enable it to be removed. The holes are fitted with plugs. As an alternative to the circlip the plugs may be formed with pin like extensions which can be engaged by the piston. The piston divides the cylinder into an upper chamber 49 and a lower chamber 50.
The lower chamber 50 can be connected to a high pressure source conveniently of oil, by way of an electromagnetically operable valve 50A which may be mounted on the holder 12 and when connected to the source a force acts upon the piston 47 to effect movement of the piston and hence the valve member 37 against the action of the spring 43. The valve 50A is a normally closed valve which is controlled by an electronic control system. The upper chamber 49 communicates with a low pressure return by way of a passage 51 formed in the holder and the passage 51 is also in communication with a space 51A defined between the spring abutment 44 and the main portion of the spacer 11.
The cap nut forms the outer wall of a gas chamber 52 which communicates with a gas inlet formed in the holder. The gas inlet is also connected to a gas reservoir chamber 53 which is defined between a sleeve 54 carried by the holder and a recess formed in the body of the holder. When the valve member 37 is lifted by the action of fluid under pressure acting on the piston 7, gas can flow from the chamber 52 to the groove 30 and hence through the gas outlets. The gas valve member is closed by the action of the spring 43 when the pressure in the lower chamber 50 is allowed to fall.
Gaseous fuel has no lubricating properties and therefore it is arranged that the fluid which is supplied to the lower chamber 50 is an oil which is able to provide lubrication of the relatively movable surfaces.
Such an oil can be the liquid fuel supplied to the lower chamber 50.
Some oil from the chamber 50 whilst the chamber is connected to the source will flow downwardly to lubricate the working surfaces of the bearing portion 40 of the valve member and the nozzle body. However, since there is a risk of gas moving towards the chamber 50 when the valve 50A is closed, a groove 56 is provided on the enlarged portion 41 of the nozzle body and this groove is connected directly to the high pressure source of oil.
Since the pressure of oil supplied by the source is greater than the gas pressure some oil may flow into the gas space but will be discharged through the gas outlet 35 to the combustion chamber. In order to provide for lubrication of working surfaces of the valve member and the extension 45 of the spring abutment a further groove 55 is formed on the nozzle body and is connected directly to the high pressure source of oil. The groove 55 is connected by drillings in the valve member with the working clearance between the valve member and the extension. Oil leaking downwardly will be collected in the upper chamber 49, and oil leaking upwardly along the working clearance between the valve member and the extension 45 will flow into the gas chamber 52 and be supplied to the combustion chamber along with the gas.
Oil flowing between the extension 45 and the nozzle body will be collected in the space 51A. In each case the upward flow of oil prevents escape of gas from the gas chamber.
Figure 3 shows the various connections to the fuel supply unit. The connections 60, 61 and 62 indicate the connection to the high pressure liquid fuel supply pump, the connection to the drain for the liquid fuel and the connection to the gas supply respectively. Connection 63 represents the connection to the high pressure source which supplies the oil under pressure and connection 64 is the leakage connection for the oil. Connection 65 is the return oil connection and as will be seen this is connected by a restrictor 66 to the lower chamber 50.
When the valve 50A is opened sufficient pressure is generated in the chamber 50 to effect movement of the piston 47 and when the valve 50A is closed the restrictor acts as a pathway to drain the fluid from the chamber 50 thereby allowing the piston 47 to move under the action of the spring 43. The restrictor can be sized to slow the rate at which the piston 47 moves under the action of the spring 43.
Although not shown, a light spring may be located in the lower chamber 50 to bias the piston into engagement with the circlip 48. In the example the gas is supplied at a pressure of 3750 p.s.i and the oil at 4500 p.s.i.
The arrangement as described uses surfaces on the liquid fuel nozzle body 10 to guide the movement of the gas valve member so as to provide a compact construction.
In addition, the seat member and the co-operating face of the valve member of the gas valve are removed from the end of the supply unit which lies within the combustion chamber and are therefore protected from the high temperatures in the combustion chamber.
Claims (4)
1. A dual fuel supply unit for supplying fuel to a combustion chamber of a compression ignition engine and comprising a liquid fuel injection nozzle including a fuel pressure actuated valve member through which at least a limited quantity of liquid fuel can be supplied to the combustion chamber to achieve generation of a flame within the combustion chamber and a gas nozzle through which gaseous fuel can be admitted to the combustion chamber, the gaseous fuel being ignited by the flame established in the combustion chamber by the injection of liquid fuel, the fuel supply unit including a nozzle body which houses the valve member of the fuel injection nozzle, and a tubular member slidably supported about a bearing surface defined by the nozzle body, said tubular member forming part of a gas control valve of the gas nozzle.
2. A fuel supply unit according to Claim 1 in which said tubular member is biased to the valve closed position by resilient means and is urged to the open position by fluid under pressure which is applied to an end surface of an annular piston slidable about a surface defined on said nozzle body.
3. A fuel supply unit according to Claim 2 in which the nozzle body is held in engagement with a spacer member by means of a cap nut and there is interposed between a step on the nozzle body and an inwardly directed flange on the cap nut, an annular valve plate having a surface forming a seating surface for engagement by an end surface of said tubular member.
4. A fuel supply unit according to Claim 3 in which the end surface of said cap nut adjacent said flange carries an orifice plate in which is formed a plurality of gas outlet orifices, the flange defining a gas conveying duct through which gas can flow to said orifices when the tubular member is lifted from the seating surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9218887A GB2270346A (en) | 1992-09-05 | 1992-09-05 | I.C.engine dual fuel injection unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9218887A GB2270346A (en) | 1992-09-05 | 1992-09-05 | I.C.engine dual fuel injection unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9218887D0 GB9218887D0 (en) | 1992-10-21 |
| GB2270346A true GB2270346A (en) | 1994-03-09 |
Family
ID=10721511
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9218887A Withdrawn GB2270346A (en) | 1992-09-05 | 1992-09-05 | I.C.engine dual fuel injection unit |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2270346A (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130160741A1 (en) * | 2011-12-23 | 2013-06-27 | Caterpillar Inc. | Dual fuel injector having fuel leak seals |
| US8733326B2 (en) | 2011-06-24 | 2014-05-27 | Caterpillar Inc. | Dual fuel injector for a common rail system |
| US8944027B2 (en) | 2011-06-21 | 2015-02-03 | Caterpillar Inc. | Dual fuel injection compression ignition engine and method of operating same |
| DE102014010716A1 (en) * | 2014-07-19 | 2016-01-21 | L'orange Gmbh | Dual-fuel fuel injector |
| DE102014015111A1 (en) * | 2014-10-10 | 2016-04-14 | L'orange Gmbh | Dual-fuel fuel injector |
| DE102014016927B3 (en) * | 2014-11-17 | 2016-05-12 | L'orange Gmbh | Dual-fuel fuel injector |
| DE102014016929A1 (en) * | 2014-11-17 | 2016-05-19 | L'orange Gmbh | Arrangement with a dual-fuel fuel injector |
| EP3153696A1 (en) * | 2015-10-07 | 2017-04-12 | Robert Bosch Gmbh | Fuel injection valve for injecting a gaseous and/or liquid fuel |
| CN111535957A (en) * | 2020-05-29 | 2020-08-14 | 一汽解放汽车有限公司 | Integrated dual-fuel injector and injection method thereof |
| CN111535955A (en) * | 2020-05-29 | 2020-08-14 | 一汽解放汽车有限公司 | Quick-response dual-fuel injection valve |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0520659A1 (en) * | 1991-06-25 | 1992-12-30 | Oy Wärtsilä Diesel International Ltd. | Improved fuel injection valve arrangement and engine using such an arrangement |
| EP0546985A1 (en) * | 1991-12-10 | 1993-06-16 | New Sulzer Diesel Ag | Fuel injection valve for a reciprocating internal combustion engine optionally operating on diesel oil or on a gaseous fuel |
-
1992
- 1992-09-05 GB GB9218887A patent/GB2270346A/en not_active Withdrawn
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0520659A1 (en) * | 1991-06-25 | 1992-12-30 | Oy Wärtsilä Diesel International Ltd. | Improved fuel injection valve arrangement and engine using such an arrangement |
| EP0546985A1 (en) * | 1991-12-10 | 1993-06-16 | New Sulzer Diesel Ag | Fuel injection valve for a reciprocating internal combustion engine optionally operating on diesel oil or on a gaseous fuel |
Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8944027B2 (en) | 2011-06-21 | 2015-02-03 | Caterpillar Inc. | Dual fuel injection compression ignition engine and method of operating same |
| US8733326B2 (en) | 2011-06-24 | 2014-05-27 | Caterpillar Inc. | Dual fuel injector for a common rail system |
| US20130160741A1 (en) * | 2011-12-23 | 2013-06-27 | Caterpillar Inc. | Dual fuel injector having fuel leak seals |
| CN104011366A (en) * | 2011-12-23 | 2014-08-27 | 卡特彼勒公司 | Dual fuel injector having fuel leak seals |
| US8978623B2 (en) * | 2011-12-23 | 2015-03-17 | Caterpillar Inc. | Dual fuel injector having fuel leak seals |
| CN104011366B (en) * | 2011-12-23 | 2017-03-15 | 卡特彼勒公司 | There is the dual fuel injector of fuel Leak seals parts |
| AU2012355402B2 (en) * | 2011-12-23 | 2016-11-24 | Caterpillar Inc. | Dual fuel injector having fuel leak seals |
| DE102014010716B4 (en) * | 2014-07-19 | 2016-05-12 | L'orange Gmbh | Dual-fuel fuel injector |
| DE102014010716A1 (en) * | 2014-07-19 | 2016-01-21 | L'orange Gmbh | Dual-fuel fuel injector |
| US9856838B2 (en) | 2014-07-19 | 2018-01-02 | L'orange Gmbh | Dual fuel fuel-injector |
| DE102014015111A1 (en) * | 2014-10-10 | 2016-04-14 | L'orange Gmbh | Dual-fuel fuel injector |
| DE102014015111B4 (en) | 2014-10-10 | 2021-08-05 | Woodward L'orange Gmbh | Dual fuel fuel injector |
| DE102014016927B3 (en) * | 2014-11-17 | 2016-05-12 | L'orange Gmbh | Dual-fuel fuel injector |
| DE102014016929A1 (en) * | 2014-11-17 | 2016-05-19 | L'orange Gmbh | Arrangement with a dual-fuel fuel injector |
| EP3153696A1 (en) * | 2015-10-07 | 2017-04-12 | Robert Bosch Gmbh | Fuel injection valve for injecting a gaseous and/or liquid fuel |
| CN111535957A (en) * | 2020-05-29 | 2020-08-14 | 一汽解放汽车有限公司 | Integrated dual-fuel injector and injection method thereof |
| CN111535955A (en) * | 2020-05-29 | 2020-08-14 | 一汽解放汽车有限公司 | Quick-response dual-fuel injection valve |
| CN111535957B (en) * | 2020-05-29 | 2021-04-20 | 一汽解放汽车有限公司 | Integrated dual-fuel injector and injection method thereof |
| CN111535955B (en) * | 2020-05-29 | 2021-04-27 | 一汽解放汽车有限公司 | Quick-response dual-fuel injection valve |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9218887D0 (en) | 1992-10-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |