• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Reciprocating piston engine with at least one main combustion chamber (5) formed between a piston (6) and a cylinder (7), which communicates via a riser channel (4) with an antechamber (3), so that the piston (6) can escape from the main combustion chamber ( 5) in the riser channel (4) depressed gas-air mixture in the prechamber (3) forms a riser flow, wherein in the antechamber (3) from the riser channel (4) separate gas supply channel (2) opens, wherein the riser channel (4) and the gas supply channel (2) are aligned with one another in such a way that gas supplied into the pre-chamber (3) via the gas supply channel (2) meets the vertical flow substantially frontally.
    公开号:AT510435A4
    申请号:T1803/2010
    申请日:2010-11-02
    公开日:2012-04-15
    发明作者:Andreas Dipl Ing Dr Wimmer；Martin Dipl Ing Klinkner；Christoph Dipl Ing Redtenbacher；Eduard Dr Schnessl；Hubert Dipl Ing Dr Techn Winter
    申请人:Ge Jenbacher Gmbh & Co Ohg；
    IPC主号:
    专利说明:

    1
    The present invention relates to a reciprocating engine with at least one formed between a piston and a cylinder main combustion chamber, which communicates via a riser with an antechamber so that compressed by the piston from the main combustion chamber in the riser gas-air mixture in the antechamber a riser flow forms, wherein in the antechamber a separate from the riser gas supply channel opens. The invention further relates to a method for operating such a reciprocating engine.
    Piston engines with bore diameters of cylinders from approx. 200 mm are often operated as pre-chamber engines. The antechamber has the task to increase the ignition energy of the spark plug to allow the ignition of the lean mixture in the main combustion chamber.
    If the pre-chamber is operated gas-flushed by a gas supply channel separate from the riser channel (to increase the energy content of the chamber), the enrichment of the chamber with fuel gas usually takes place in the charge exchange via a pressure-controlled gas valve connected to the gas supply channel.
    In the compression stroke lean gas-air mixture flows from the main combustion chamber in the antechamber and mixes with the there enriched mixture. Until ignition, the mixture in the pre-chamber can be largely homogenized, but remain locally insufficient mixed zones. Due to locally rich and lean zones, combustion is incomplete and slower, with less firing impulse available for igniting the main combustion chamber. In addition, the efficiency deteriorates. In addition, in the gas supply channel remains a very rich zone, so it comes here during combustion to form soot particles. In the charge cycle, these particles pass through the antechamber into the main combustion chamber and further into the exhaust system via the exhaust ducts. This has the consequence that problems occur due to contamination of the following system components and that without corresponding exhaust aftertreatment soot particles reach the environment.
    The object of the invention is to provide a generic reciprocating engine, in which the above-mentioned problems are at least partially resolved. 68242-36 / fr 2
    This is achieved by a reciprocating engine according to claim 1 and a method according to claim 4.
    The invention causes an improvement in the homogenization of the mixture in the pre-chamber with the associated better performance (faster burning of the mixture, better ignition of the main combustion chamber) and a reduction of soot formation by rich zones in the gas supply channel.
    The rinsing of the prechamber via the gas supply channel takes place in the compression stroke. The arrangement of rising channel, prechamber and gas supply channel is to be designed so that the axes of riser channel and gas supply channel in the best case are aligned or occupy a maximum of a slight angle to each other. In no case, however, should the angle be so great that the axis of the gas supply channel penetrates the cylinder wall of the riser channel at the level of the junction of the riser channel into the prechamber. At the same time, the prechamber must be designed so that it does not adjust the free volume between riser channel and gas supply channel by undercuts or other shaping. The aim of this arrangement is to achieve a good premixing of the introduced via the gas supply channel gas with the inflowing from the main combustion chamber in the pre-chamber mixture already during the injection process. The frontal impact of the two flows increases the mixture - forming effect, as can be confirmed by CFD simulations as well as by optical investigations in a blow - in chamber.
    Furthermore, sufficient gas pressure should be available for the injection process so that, despite the increasing compression pressure in the compression phase, a sufficient penetration depth of the injection jet emerging from the gas supply channel is achieved, which has a positive effect on the premix.
    The arrangement of the channels additionally offers the advantage that after completion of the injection process lean mixture flows in the direction of the gas supply channel, which causes a dilution of the rich zone in the gas supply channel. As tests on the test bench have shown, soot formation in the gas supply channel can be significantly reduced. 3
    Particularly preferred is a further improvement of the mixture formation is provided by generating a Tumbleströmung in the antechamber. The riser channel of the antechamber is to be positioned asymmetrically or eccentrically in such a way that the lean mixture flowing from the main combustion chamber into the antechamber generates a defined tumble flow there. This Tumbleströmung allows extensive detection of the antechamber, so that by countercurrent already premixed enriched mixture can be further homogenized. The asymmetry can be achieved in compliance with the geometric conditions described above by inclination of the riser to Vorkammerachse or by Paralleivershiebung a vertical riser to Vorkammerachse or by a combination of both possibilities, as long as it is ensured that forms a defined Tumbleströmung. Whether a Tumbleströmung is formed at a certain geometry, can be easily determined by numerical simulation or in experimental engines.
    It has been said that the riser flow is formed by a gas-air mixture and hits gas supplied via the gas supply channel. This is not intended to give the impression that the gas supplied via the gas supply channel may only be a pure gas in the sense that the gas consists only of propellant gas without admixing with air. If one wants to formulate exactly, both the gas forming the riser flow and the gas supplied via the gas supply duct would have to be referred to as propellant-air mixture, the gas forming the riser stream always having a relevant admixture of air, while it is quite conceivable in that the gas supplied via the gas supply channel is in fact essentially pure gas without admixing with air. For the sake of readability, the use of exact terminology has been omitted, but this should not be construed as limiting the scope of protection.
    The piston engine according to the invention is particularly preferably designed as a stationary gas engine.
    Further advantages and details of the invention will become apparent from the figures and the associated description of the figures. Show: 4
    Fig. 1 is a sectional view of the relevant to the invention part of a
    reciprocating engine
    Fig. 2a, 2b is a plan view and a perspective view of a coming in the invention used for pre-chamber outside its installation position in the reciprocating engine and
    Fig. 3 is a perspective view of the pre-chamber showing an ignition device and the gas valve.
    Fig. 1 refers to the preferred embodiment of the invention, in which not only the riser channel 4 and the gas supply channel 2 are aligned with each other so that via the gas supply channel 2 into the prechamber 3 supplied gas substantially frontal on the emerging from the riser channel 4 Rising flow meets (solid arrows in Fig. 1), but it is additionally provided that the riser 4 so off-center opens into the prechamber 3, that a defined Tumbleströmung formed (dashed line in Fig. 1).
    In the method for operating the reciprocating engine is inventively provided that in the phase in which is pushed by the piston 6 from the main combustion chamber 5 via the overflow 8 and the riser 4 (compression stroke) gas is passed through the gas supply channel 2 into the pre-chamber 3. This is done via the gas valve 1, which is preferably designed as an electrically controllable gas injector.
    From Fig. 2a, the preferred provided eccentric junction of the riser 4 in the prechamber 3 is apparent. Fig. 2b shows a corresponding perspective view, with six overflow holes 8 can be seen, which connect the main combustion chamber 5, not shown, with the riser channel 4.
    Fig. 3 shows a perspective view of the relevant parts of Fig. 1. 1 ......... Gas valve 2 ......... Gas supply channel 3 ......... Prechamber 4 ......... riser 5 ......... main combustion chamber 6 ......... piston 7 ......... cylinder liner 8 ...... ... Overflow holes 9 ......... Cylinder head 10 ......... Spark plug sleeve 11 ......... Spark plug
    Innsbruck, on October 29, 2010
    权利要求:
    Claims (5)
    [1]
    1 reciprocating engine with at least one between a piston (6) and a cylinder (7) formed main combustion chamber (5) via a riser channel (4) with an antechamber (3) is in communication, so by the piston (6 ) from the main combustion chamber (5) in the riser (4) depressed gas-air mixture in the prechamber (3) forms a riser, wherein in the antechamber (3) from the riser (4) separate gas supply channel (2) opens, characterized in that the riser duct (4) and the gas supply duct (2) are aligned with one another in such a way that gas supplied into the prechamber (3) via the gas supply duct (2) strikes the riser flow substantially head-on.
    [2]
    2. Reciprocating engine according to claim 1, characterized in that the riser channel (4) opens off-center into the pre-chamber (3).
    [3]
    3. Reciprocating engine according to claim 1 or 2, characterized in that the gas supply channel (2) is connected to a gas valve (1), preferably an electrically controllable gas injector.
    [4]
    4. A method for operating a reciprocating engine according to one of claims 1 to 3, characterized in that in that phase, in which by the piston (6) from the main combustion chamber
    [5]
    (5) Gas-air mixture in the riser (4) is pressed, gas is passed through the gas supply channel (2) in the prechamber (3). Innsbruck, on October 29, 2010 68242-36 / fr
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US2741229A|1951-01-16|1956-04-10|Daimler Benz Ag|Prechamber compression ignition engine|
    US4294209A|1976-08-18|1981-10-13|Daimler-Benz Aktiengesellschaft|Internal combustion engine|
    JPS5950848B2|1978-05-11|1984-12-11|Toyota Motor Co Ltd|
    JPH0630433A|1992-07-08|1994-02-04|Matsushita Electric Ind Co Ltd|Luminance signal/chrominance signal separating device|
    JPH0630433U|1992-09-18|1994-04-22|三菱重工業株式会社|Gas engine torch ignition device|
    DE19638024A1|1996-09-18|1998-03-19|Bosch Gmbh Robert|Internal combustion engine|
    US7387103B2|2003-11-19|2008-06-17|Dan Merritt|Internal combustion engine|
    JP4871141B2|2007-01-09|2012-02-08|大阪瓦斯株式会社|Sub-chamber engine|
    FI123915B|2008-03-03|2013-12-13|Waertsilae Finland Oy|Förkammararrangemang|DE102012021778B4|2012-11-06|2016-03-10|Mtu Friedrichshafen Gmbh|Mixture-charged gas engine and method for compensating for volumetric deviations in a mixed supercharged gas engine|
    WO2019100035A1|2017-11-17|2019-05-23|Clean Train Propulsion|Efficiency and emissions improvements for natural gas conversions of emd 2-cycle medium speed engines|
    JP5920317B2|2013-11-13|2016-05-18|株式会社デンソー|Sub-chamber internal combustion engine|
    US9556844B2|2015-02-13|2017-01-31|Caterpillar Inc.|Nozzle with contoured orifice surface and method of making same|
    EP3118433A1|2015-07-16|2017-01-18|Caterpillar Energy Solutions GmbH|Pre-combustion chamber assembly for internal combustion engines|
    US20160053672A1|2015-11-05|2016-02-25|Caterpillar Inc.|Fuel supply system for engine|
    WO2017082953A1|2015-11-11|2017-05-18|Cummins Inc.|Charge-fed pre-chamber assembly|
    DE102016107669B4|2016-04-26|2018-08-16|L'orange Gmbh|Prechamber spark plug assembly|
    JP6562019B2|2017-03-16|2019-08-21|トヨタ自動車株式会社|Internal combustion engine|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA1803/2010A|AT510435B1|2010-11-02|2010-11-02|reciprocating engine|ATA1803/2010A| AT510435B1|2010-11-02|2010-11-02|reciprocating engine|
    EP11779547.6A| EP2635780B1|2010-11-02|2011-09-21|Reciprocating piston engine|
    PCT/AT2011/000386| WO2012058700A1|2010-11-02|2011-09-21|Reciprocating piston engine|
    US13/875,450| US8720411B2|2010-11-02|2013-05-02|Reciprocating piston engine|
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