CN110566386A - Nozzle assembly for fuel injector, fuel injector - Google Patents
Nozzle assembly for fuel injector, fuel injector Download PDFInfo
- Publication number
- CN110566386A CN110566386A CN201910484303.8A CN201910484303A CN110566386A CN 110566386 A CN110566386 A CN 110566386A CN 201910484303 A CN201910484303 A CN 201910484303A CN 110566386 A CN110566386 A CN 110566386A
- Authority
- CN
- China
- Prior art keywords
- nozzle
- fuel
- needle
- nozzle assembly
- injection
- 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.)
- Pending
Links
Classifications
-
- 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
- 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
-
- 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
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
- F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size
-
- 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
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
- F02M61/1893—Details of valve member ends not covered by groups F02M61/1866 - F02M61/188
-
- 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
- F02D19/0639—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 characterised by the type of fuels
- F02D19/0642—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 characterised by the type of fuels at least one fuel being gaseous, the other fuels being gaseous or liquid at standard conditions
- F02D19/0647—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 characterised by the type of fuels at least one fuel being gaseous, the other fuels being gaseous or liquid at standard conditions the gaseous fuel being liquefied petroleum gas [LPG], liquefied natural gas [LNG], compressed natural gas [CNG] or dimethyl ether [DME]
-
- 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
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/46—Valves, e.g. injectors, with concentric valve bodies
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The invention relates to a nozzle assembly (1) for a fuel injector, by means of which two different fuels can be injected into a combustion chamber (2) of an internal combustion engine at different points in time, comprising a nozzle body (3) and two coaxially arranged, reciprocatable nozzle needles (4, 5) for controlling injection openings (6, 7), wherein a first nozzle needle (4) is at least partially embodied as a hollow needle and a second nozzle needle (5) is at least partially received in the first nozzle needle (4). According to the invention, all injection openings (6, 7) for the first fuel and for the second fuel are formed in the nozzle body (3). The invention also relates to a fuel injector having such a nozzle assembly (1).
Description
Technical Field
The present invention relates to a nozzle assembly for a fuel injector. Furthermore, the invention relates to a fuel injector with such a nozzle assembly. Two different fuels can be injected into the combustion chamber of an internal combustion engine at different points in time by means of a fuel injector. The first fuel may be, for example, a gaseous fuel, in particular Natural Gas (NG), and the second fuel a liquid fuel, in particular diesel fuel. The fuel injector may in particular be an NGDI injector.
Background
In the so-called NGDI Injection method ("Natural Gas Direct Injection"), Natural Gas is directly injected into the combustion chamber of the internal combustion engine, ignited by means of a previously provided diesel pilot Injection and subsequently diffusely combusted. The combustion of natural gas has, in particular, the following advantages with respect to the conventional combustion of diesel oil: CO 22Emissions can be reduced up to 25%. Here, natural gas has similar combustion characteristics and thus similar torque characteristics to diesel, so that the degree of integration in existing diesel drive systems is high. That is, only minor changes to the internal combustion engine, the cooling system and/or the exhaust gas aftertreatment system are typically required.
In order to inject natural gas and diesel Fuel directly into the combustion chamber of an internal combustion engine, so-called Dual-Fuel-injector (Dual-Fuel-Injektor) may be used. The dual fuel injector may have, for example, two coaxially arranged nozzle needles guided in a manner fitting to one another, wherein an outer nozzle needle controls at least one injection opening for introducing or injecting natural gas and an inner nozzle needle controls at least one injection opening for introducing or injecting diesel fuel. Such a dual fuel injector is known, for example, from the publication DE 102014225167 a 1.
To achieve optimal combustion in an NGDI injection method, the ignition and gas jets must be aligned with each other. As a result, anti-twisting measures are usually taken, which prevent twisting of the outer nozzle needle with the first injection opening relative to the nozzle body with the second injection opening.
Disclosure of Invention
Starting from the prior art mentioned above, the object of the present invention is to provide a nozzle arrangement for a fuel injector, which enables an optimized combustion and at the same time is less expensive to produce.
To solve this task, a nozzle assembly according to the invention is proposed. In the following, advantageous embodiments of the invention are explained. A fuel injector having a nozzle assembly according to the present disclosure is also described.
The proposed nozzle assembly comprises a nozzle body and two coaxially arranged, reciprocatable nozzle needles for controlling the injection opening, wherein the first nozzle needle is at least partially embodied as a hollow needle and the second nozzle needle is at least partially received in the first nozzle needle. The nozzle arrangement is therefore particularly suitable for fuel injectors with which two different fuels can be injected into a combustion chamber of an internal combustion engine at different points in time. According to the invention, all injection openings for the first fuel and for the second fuel are formed in the nozzle body. That is to say that all the spray openings are formed in the same component, so that a complex alignment of the spray openings relative to one another is no longer necessary. In addition, measures for torsion resistance can be eliminated. Furthermore, the arrangement of all the spray openings is realized in one component, which (unlike the nozzle needle) does not execute a reciprocating movement. Thus, all injection openings are also always located in the same position in the axial direction.
The proposed nozzle assembly is therefore relatively simple to construct and can be produced accordingly. At the same time, the injection openings can be arranged in the nozzle body in such a way that an optimized combustion of the fuel in the combustion chamber is achieved.
According to a preferred embodiment of the invention, the nozzle body is closed except for the injection opening to the combustion chamber. In contrast to the prior art mentioned at the outset, therefore, no guide which is parasitic with respect to the injection opening projects into the combustion chamber again. This ensures that fuel only reaches the combustion chamber via the injection opening.
Preferably, the nozzle body forms a sealing seat for the first nozzle needle. Downstream of the sealing seat, the nozzle body and the first nozzle needle delimit a first pressure chamber from which a first injection opening for the first fuel emanates. Thus, a flow path through which the first fuel reaches the first injection opening can be conducted by the reciprocating movement of the first nozzle needle. The first fuel can be, in particular, a gaseous fuel, for example natural gas, which is injected into the combustion chamber for operating the internal combustion engine and is combusted. During the reciprocating movement of the first nozzle needle, the positions of the injection openings do not change relative to one another, since all injection openings are formed in the nozzle body.
It is also proposed that the nozzle body has a guide bore, which is designed as a blind bore, for receiving and guiding the first nozzle needle. Inside the guide bore, the first nozzle needle delimits a second pressure chamber from which a second injection opening for the second fuel emanates. The guide can bring about centering of the first nozzle needle with respect to the nozzle body and thus with respect to the sealing seat formed by the nozzle body. At the same time, the guide gap serves as a sealing gap for separating the second pressure chamber for the second fuel from the first pressure chamber for the first fuel.
Furthermore, the first nozzle needle is preferably designed as a sealing seat for the second nozzle needle. Thus, the flow path for the second fuel may be opened by the reciprocating movement of the second nozzle needle relative to the first nozzle needle. In order to achieve the second fuel to a second injection opening formed in the nozzle body, it is proposed that a first nozzle needle, which is formed as a sealing seat for the second nozzle needle, opens downstream of the sealing seat and/or has at least one connection channel into the second pressure chamber. The flow path for the second fuel thus extends through the opening formed in the first nozzle needle and/or the at least one connecting channel.
The second fuel may in particular be a liquid fuel, for example diesel fuel, which may be used to ignite the first fuel.
Furthermore, it is preferred that the first and second injection openings each form a porous circle (Lochkreis). The porous circles enable a uniform distribution of the fuel in the combustion chamber upon injection. Therefore, for the same reason, the ejection openings of the porous circles are also preferably arranged at the same angular intervals with respect to each other.
Advantageously, the number of first and second ejection openings is the same. That is, each perforated circle includes the same number of ejection openings. Thus, a second injection opening can be associated with each first injection opening in order to ensure an optimized combustion.
It is furthermore proposed that the first and second spray openings are aligned relative to one another such that they overlap one another in the axial direction. This ensures that the fuel jets formed by the injection openings impinge on one another in the combustion chamber in order to ignite the first fuel by the second fuel.
Advantageously, the first injection opening for the first fuel is larger than the second injection opening for the second fuel. Since the second fuel is mainly used to ignite the first fuel, the injection amount can be reduced. Preferably, the spray openings of the two perforated circles are arranged at an axial distance from one another, so that the first perforated circle has a larger diameter than the second perforated circle. The larger diameter of the first porous circle simplifies the construction of the larger injection opening for the first fuel.
In order to solve the task mentioned at the outset, a fuel injector for two different fuels is also proposed, which fuels have to be injected into the combustion chamber of an internal combustion engine at separate points in time. To this end, the proposed fuel injector comprises a nozzle assembly according to the invention such that the injection of the two fuels is achieved by injection openings which are optimally aligned with one another. Thus, the same advantages as the nozzle assembly can be achieved by the fuel injector, avoiding repeated reference to the description of the nozzle assembly.
The fuel injector is preferably an NGDI injector, by means of which two different fuels can be injected directly into the combustion chamber of the internal combustion engine at separate points in time. In this case, a preferably liquid second fuel, which may be in particular diesel fuel, is introduced in a pilot injection for igniting the first fuel. The first fuel may be, inter alia, natural gas or methanol.
Drawings
Preferred embodiments of the present invention will be explained in detail below with reference to the accompanying drawings. Fig. 1 shows a schematic longitudinal section of a nozzle assembly according to the invention or a fuel injector according to the invention in the region of a nozzle.
Detailed Description
The illustrated nozzle assembly 1 for a fuel injector comprises a nozzle body 3, in which two coaxially arranged nozzle needles 4, 5 are received in a reciprocating manner, by means of which two different fuels can be injected into a combustion chamber 2 of an internal combustion engine at separate points in time. The spray openings 6, 7 can be controlled by the reciprocating movement of the nozzle needles 4, 5, of which the first spray opening 6 is arranged in a first porous circle and the second spray opening 7 is arranged in a second porous circle. A first fuel, which may be, in particular, natural gas, may be injected through the injection openings 6 of the first porous circle. A second fuel, preferably diesel fuel, can be injected through the injection openings 7 of the second porous circle, which second fuel is introduced into the combustion chamber 2 of the internal combustion engine in a pre-injection manner for igniting the first fuel. All the spray openings 6, 7 or the two perforated circles are formed in the nozzle body 3, to be precise in the following manner: each injection opening 6 of the first perforated circle is assigned to an injection opening 7 of the second perforated circle, wherein the injection openings 6, 7 assigned to one another are arranged one above the other with an axial distance. This ensures that the fuel jet exiting through the first perforated circle hits the ignition jet introduced in the form of a pilot injection before it hits the combustion chamber 2, so that the first fuel is ignited and burns as completely as possible.
All the spray openings 6, 7 are arranged in one component, their positions not changing in relation to each other. The positions of the ejection openings do not change relative to each other during the reciprocating movement of the nozzle needles 4, 5. Thus, the spray openings 6, 7 are also continuously optimally aligned with one another.
To achieve the preliminary injection, the second or inner nozzle needle 5 is first actuated such that it is lifted off a sealing seat 12, which is formed by the first or outer nozzle needle 4. The internal nozzle needle 5 thereby opens a flow path which is guided via the sealing seat 12 and the connecting channel 13 into the pressure chamber 11, from which the second injection opening 7 emanates. The pressure chamber 11 is arranged inside a guide hole 10 of the nozzle body 3 for guiding the outer nozzle needle 4.
The pilot injection is followed by an injection of a first fuel for operating the internal combustion engine. For this purpose, the first or outer nozzle needle 4 is actuated in such a way that it is lifted off a sealing seat 8 formed by the nozzle body 3. The outer nozzle needle 4 therefore opens a flow path for the first fuel, which is guided via the sealing seat 8 into the pressure chamber 9 from which the first injection opening 6 emanates.
Claims (10)
1. Nozzle assembly (1) for a fuel injector, by means of which two different fuels can be injected into a combustion chamber (2) of an internal combustion engine at different points in time, comprising a nozzle body (3) and two coaxially arranged, reciprocatable nozzle needles (4, 5) for controlling injection openings (6, 7), wherein a first nozzle needle (4) is at least in sections embodied as a hollow needle and a second nozzle needle (5) is at least in sections received in the first nozzle needle (4),
Characterized in that all injection openings (6, 7) for the first fuel and for the second fuel are formed in the nozzle body (3).
2. Nozzle assembly (1) according to claim 1, characterized in that the nozzle body (3) is embodied closed except for the injection openings (6, 7) which open into the combustion chamber (2).
3. Nozzle assembly (1) according to claim 1 or 2, characterized in that the nozzle body (3) forms a sealing seat (8) for the first nozzle needle (4), and that the nozzle body (3) and the first nozzle needle (4) delimit, downstream of the sealing seat (8), a first pressure chamber (9) from which a first injection opening (6) for the first fuel emanates.
4. nozzle assembly (1) according to one of the preceding claims, characterized in that the nozzle body (3) has a guide bore (10) configured as a blind bore for receiving and guiding the first nozzle needle (4), the first nozzle needle (4) delimiting inside this guide bore a second pressure chamber (11) from which a second injection opening (7) for the second fuel emanates.
5. Nozzle assembly (1) according to one of the preceding claims, characterized in that the first nozzle needle (4) constitutes a sealing seat (12) for the second nozzle needle (5) and opens downstream of this sealing seat (12) and/or has at least one connection channel (13) opening into the second pressure chamber (11).
6. Nozzle assembly (1) according to one of the preceding claims, characterized in that the first ejection opening (6) and the second ejection opening (7) each constitute a porous circle, wherein preferably the ejection openings (6, 7) of the same porous circle are arranged at the same angular spacing relative to each other.
7. Nozzle assembly (1) according to any of the preceding claims, wherein the number of first ejection openings (6) and second ejection openings (7) is the same.
8. Nozzle assembly (1) according to one of the preceding claims, characterized in that the first ejection opening (6) and the second ejection opening (7) are aligned relative to each other such that they overlap each other in axial direction.
9. Nozzle assembly (1) according to any of the preceding claims, wherein the first ejection opening (6) is larger than the second ejection opening (7).
10. Fuel injector for two different fuels which have to be injected at separate points in time into a combustion chamber (2) of an internal combustion engine, comprising a nozzle assembly (1) according to any one of the preceding claims.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102018208869.1A DE102018208869A1 (en) | 2018-06-06 | 2018-06-06 | Nozzle assembly for a fuel injector, fuel injector |
| DE102018208869.1 | 2018-06-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110566386A true CN110566386A (en) | 2019-12-13 |
Family
ID=68652075
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910484303.8A Pending CN110566386A (en) | 2018-06-06 | 2019-06-05 | Nozzle assembly for fuel injector, fuel injector |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN110566386A (en) |
| DE (1) | DE102018208869A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112096553A (en) * | 2020-09-14 | 2020-12-18 | 一汽解放汽车有限公司 | Oil sprayer |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113250875B (en) * | 2020-02-13 | 2022-05-03 | 上海汽车集团股份有限公司 | Oil sprayer |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101657630A (en) * | 2007-04-13 | 2010-02-24 | 丰田自动车株式会社 | Fuel injection valve for internal combustion engine |
| CN202065107U (en) * | 2011-03-21 | 2011-12-07 | 浙江吉利汽车研究院有限公司 | Injection nozzle |
| CN104011366A (en) * | 2011-12-23 | 2014-08-27 | 卡特彼勒公司 | Dual fuel injector having fuel leak seals |
| US20170175693A1 (en) * | 2014-03-28 | 2017-06-22 | Quantlogic Corporation | A fuel injector flexible for single and dual fuel injection |
| CN110500214A (en) * | 2018-05-16 | 2019-11-26 | 罗伯特·博世有限公司 | Method for operating a fuel injector |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102014225167A1 (en) | 2014-12-08 | 2016-06-09 | Robert Bosch Gmbh | Fuel metering valve for an internal combustion engine and method for operating the same |
-
2018
- 2018-06-06 DE DE102018208869.1A patent/DE102018208869A1/en not_active Withdrawn
-
2019
- 2019-06-05 CN CN201910484303.8A patent/CN110566386A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101657630A (en) * | 2007-04-13 | 2010-02-24 | 丰田自动车株式会社 | Fuel injection valve for internal combustion engine |
| CN202065107U (en) * | 2011-03-21 | 2011-12-07 | 浙江吉利汽车研究院有限公司 | Injection nozzle |
| CN104011366A (en) * | 2011-12-23 | 2014-08-27 | 卡特彼勒公司 | Dual fuel injector having fuel leak seals |
| US20170175693A1 (en) * | 2014-03-28 | 2017-06-22 | Quantlogic Corporation | A fuel injector flexible for single and dual fuel injection |
| CN110500214A (en) * | 2018-05-16 | 2019-11-26 | 罗伯特·博世有限公司 | Method for operating a fuel injector |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112096553A (en) * | 2020-09-14 | 2020-12-18 | 一汽解放汽车有限公司 | Oil sprayer |
| CN112096553B (en) * | 2020-09-14 | 2021-09-24 | 一汽解放汽车有限公司 | Oil sprayer |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102018208869A1 (en) | 2019-12-12 |
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| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20191213 |