奥地利专利AT512532A4 Pre-chamber system for an internal combustion engine

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权利要求

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专利摘要:
Pre-chamber system for an internal combustion engine, in particular for a gas engine, with a pre-chamber volume (4) in which an ignitable fuel-air mixture - in particular by a Vorkammersystem (1) can be arranged ignition device (6) - is flammable, the Vorkammersystem (1) is equipped with an overflow channel (5) through which the pre-chamber volume (4) with a main combustion chamber (10) of the internal combustion engine (18) is connectable, wherein the pre-chamber volume (4) an ignition region (3) and through an intermediate wall (9) at least In the ignition region (3), the fuel-air mixture is flammable and the overflow channel (5) opens into the overflow region (2), and that an air supply line (8) is provided , wherein the overflow region (2) via the air supply line (8) - preferably compressed - air can be fed.
公开号:AT512532A4
申请号:T1048/2012
申请日:2012-09-26
公开日:2013-09-15
发明作者:
申请人:Ge Jenbacher Gmbh & Co Og；
IPC主号:

专利说明:

The present invention relates to a Vorkammersystem for an internal combustion engine according to claim 1, and an internal combustion engine with such Vorkammersystem.
When operating an internal combustion engine - in particular a gas engine - with substantially stoichiometric ratio of fuel and air very high temperatures can occur, which is detrimental to the exhaust behavior of such a motor. This situation can be counteracted by exhaust gas recirculation. However, this leads to a deterioration of the ignition behavior.
In this case, to use a pre-chamber to be filled with fuel gas for ignition, as is standardly solved in large-volume lean burn engines, is initially problematic. Because the mixture that is pressed during compression from the main combustion chamber in the antechamber, yes, no excess air, which sets in the antechamber no easily ignitable fuel-air mixture.
In DE 35 06 217 A1 this problem is circumvented in that the pre-chamber is already supplied with a near-stoichiometric mixed fuel gas. The disadvantage here in addition to the increased design effort that there is a possibility of the back ignition of the pre-chamber mixture into the supply channels at a wear of the injection valve of the prechamber. This poses a security risk that should be avoided.
The object of the present invention is to provide a Vorkammersystem that allows a good ignition of the fuel-air mixture in the antechamber even at the stoichiometric operation of a large volume engine with substantial exhaust gas recirculation without simultaneously a security risk by the presence of flammable fuel-air mixture outside the combustion chambers introduce. • t ··· φ φ «t ··· • * * ·» ι · * ·· · • ♦ · * ΦΦΦ * ι «· · · * ··· ** # *« * · · · ··· · · «« Φ φ 2
This object is achieved by a Vorkammersystem with the features of claim 1 and with an internal combustion engine having such Vorkämmersystem.
By dividing the prechamber volume into an ignition region and an overflow region which is at least partially separated by an intermediate wall from the ignition region and by introducing air through the air supply line into the overflow region, a minimum of exhaust-containing combustion mixture passes from the main combustion chamber into the ignition region during the compression phase. At the same time, this main chamber gas pushes the air introduced through the air supply line into the ignition region, whereby a well ignitable mixture is formed there. In this way, a lambda value of 0.8 to 1.2 can be achieved in the ignition range of the prechamber, wherein the lambda value relates to the ratio of air to fuel and the lambda value 1 the ideal, ie stoichiometric, ratio represents.
Further advantageous embodiments of the invention are defined in the dependent claims.
In order to facilitate the ignition flame generated by the ignition in the pre-chamber reaching the main combustion chamber, a connecting channel may be formed in the intermediate wall, wherein the connecting channel connects the ignition region with the overflow region
In order to achieve uniform cooling of the entire pre-chamber by the injected air, it may be provided that the intermediate wall is formed substantially circumferentially with respect to a longitudinal axis of the pre-chamber system, wherein the overflow substantially the ignition area - separated by the circumferential partition wall ,
Preferred is an embodiment in which via the air supply line a preferably cooled charge air of the internal combustion engine and / or a compressed air preferably compressed to 6 bar to 10 bar into the overflow region. ·············································. This is the effective keeping away the exhaust gas mixture from the ignition area further beneficial.
For energetic reasons, it may be provided in this case first charge air, which is typically available with a pressure of 2 bar to 3 bar from a turbocharger available, and then, as soon as the pressure in the pre-chamber exceeds the pressure of the charge air to supply compressed air. For a precise control or regulation of the period of the air supply or the amount of supplied air, it may be provided that a valve is arranged on the air supply line, which is preferably formed electronically. For the optimum propagation of the supplied air, it may be provided that in the overflow region with respect to a longitudinal axis of the pre-chamber system, a circumferential annular channel is formed, wherein preferably the air supply line opens into the annular channel. In order to enable a honeycomb-like inflow of the air, in this case between the annular channel and the remainder of the overflow a circumferential annular gap may be formed, wherein viewed radially with respect to the longitudinal axis of the annular channel an annular channel width and the annular gap has an annular gap width, preferably the annular gap width is smaller than the ring channel width is.
So that a sufficiently large volume is available for pressure equalization, an overflow volume of the overflow region can be made larger than an ignition volume of the ignition region.
It may be provided that the connecting channel has a connecting channel opening, wherein the connecting channel opening opens into the overflow region. Since it is advantageous in terms of flow mechanics, it is particularly preferred that, with respect to a longitudinal axis of the prechamber system, starting from the connection channel opening, a partial volume of the overflow region facing away from the ignition region is smaller than the remaining residual volume of the overflow region. • · · · · · · · «* · · · * # t · t | · · · · · · · · ················ 4
In order to achieve a particularly directed exit of the flow, the ratio of a channel diameter of the overflow channel to a channel length of the overflow channel can be at most 0.25. Thus, it can be provided both that the Überstömkanal the Vorkammersystems is formed obliquely with respect to the longitudinal axis, and that the overflow is formed with its opening into the overflow Oberströmkanalöffnung substantially tangential with respect to an inner wall of the Vorkammersystems. As a result, the flow of the fuel-air mixture flowing through the compression into the pre-chamber away from the ignition volume of the prechamber.
In order to guarantee a directed flow of the pilot flame in the overflow channel, it can be provided that the connecting channel opening - or at least a part of its cross section - extends in the direction of the overflow channel opening.
Further advantages and details of the invention will become apparent from the figures and the associated description of the figures. The figures 1-4 show sectional views of various embodiments of the invention Vorkammersysteme.
FIG. 1 shows firstly the prechamber volume 4 of the prechamber system 1, the ignition device 6, the overflow channel 5 with its overflow channel opening 16 and a fuel gas line 7. The Überstömbereich 2 is delimited from the ignition region 3 by an intermediate wall 9, wherein the two regions are connected by the connecting channel 11 with a connecting channel opening 15. The overflow 5 is guided here tangentially to the inner wall 17. An annular channel 3 which is of annular design around the longitudinal axis X is connected to the remainder of the overflow region 2 via an annular gap 14. In the annular channel 13, the air supply line 8, which allows both the supply of charge air and the supply of compressed air, wherein the supply of compressed air by means of an electronic valve 12 is controlled. * l * * Μ * «fl« «* * * * * *« «·················································································································································
Figure 2 shows an inventive Vorkammersystem in which also the connecting channel 11 is made obliquely with respect to the longitudinal axis X. In addition, a second electronic valve 12 is provided, which controls the supply of charge air.
FIG. 3 shows an embodiment without connecting channel 11.
FIG. 4 shows an embodiment which is similar to FIG. 2, but with a different geometry of the overflow channel 11, in particular the overflow channel opening 15.
The present invention is not limited to the above embodiments. For example, the overflow channel can be carried out centrally along the longitudinal axis. It may be advantageous to let the connecting channel opening point away from the overflow channel opening. A mixture, for example with a lambda value of 0.3, could also be supplied via the fuel gas line 7.
Innsbruck, September 24, 2012

权利要求:
Claims (17)
[1]
• ·· Φ · ♦ · · «« «*» »« φ | 1. Chamber of an internal combustion engine, in particular for a gas engine, with a Prechamber volume (4), in which an ignitable fuel-air mixture - in particular by a Vorkammersystem (1) can be arranged ignition device (6) - is flammable, the Vorkammersystem (1) is equipped with an overflow channel (5) through which the Prechamber volume (4) with a main combustion chamber (10) of the internal combustion engine (18) is connectable, characterized in that the pre-chamber volume (4) an ignition region (3) and an at least partially separated by an intermediate wall (9) from the ignition region (3) overflow region (3) 2), wherein in the ignition region (3), the fuel-air mixture is flammable and the overflow channel (5) opens into the overflow region (2), and that an air supply line (8) is provided, wherein the overflow region (2) via the L Air supply line (8) - preferably compressed - air can be supplied.
[2]
2. Vorkammersystem according to claim 1, characterized in that in the intermediate wall (9), a connecting channel (11) is formed, wherein the connecting channel (11) connects the ignition region (3) with the overflow region (2).
[3]
3. Vorkammersystem according to claim 1 or 2, characterized in that the intermediate wall (9) with respect to a longitudinal axis (X) of the Vorkammersystems (1) is formed substantially circumferentially, wherein the overflow region (2) the ignition region (3) - separated by the circumferential intermediate wall (9) - substantially surrounds.
[4]
4. Vorkammersystem according to at least one of claims 1 to 3, characterized in that via the air supply line (8) a - preferably cooled - charge air of the internal combustion engine (18) and / or a - preferably compressed to 6 bar to 10 bar - compressed air in the Overflow area (2) can be introduced. * 4 • * • ♦ ί
[5]
5. Vorkammersystem according to at least one of claims 1 to 4, characterized in that arranged for controlling or regulating a period of supply of air and / or the amount of air supplied in the air supply line (8), preferably electronic, valve (12) is.
[6]
6. Vorkammersystem according to at least one of claims 1 to 5, characterized in that in the overflow region (2) with respect to a longitudinal axis (X) of the Vorkammersystems (1) a circumferential annular channel (13) is formed, wherein preferably the air supply line (8). in the annular channel (13) opens.
[7]
7. Vorkammersystem according to claim 6, characterized in that between the annular channel (13) and the rest of the overflow region (2) a circumferential annular gap (14) is formed, wherein radially with respect to the longitudinal axis (X) considered the annular channel (13) an annular channel width and the annular gap (14) has an annular gap width, wherein preferably the annular gap width is smaller than the annular channel width.
[8]
8. Vorkammersystem according to at least one of claims 1 to 7, characterized in that an overflow volume of the overflow region (2) is greater than an ignition volume of the ignition region (3) is formed.
[9]
9. Vorkammersystem according to at least one of claims 1 to 8, characterized in that the connecting channel (11) has a connecting channel opening (15), wherein the connecting channel opening (15) in the overflow region (2) opens.
[10]
10. Vorkammersystem according to claim 9, characterized in that with respect to a longitudinal axis (X) of the Vorkammersystems (1) starting from the connecting channel opening (15) a ignition region (3) facing away from the partial volume of the overflow region (2) is smaller than the remaining residual volume the overflow area (2). • * * ft ft • t. · Ft · ft · ft · ft · ft ··· ...... ..... * 3 ......
[11]
11. Vorkammersystem according to at least one of claims 1 to 10, characterized in that the ratio of a channel diameter of the overflow channel (5) to a channel length of the overflow channel (5) is at most 0.25.
[12]
12. Vorkammersystem according to at least one of claims 1 to 11, characterized in that the overflow channel (5) of the Vorkammersystems (1) with respect to a longitudinal axis (X) is formed obliquely.
[13]
13. Vorkammersystem according to at least one of claims 1 to 12, characterized in that the overflow channel (5) has a Überströmkanalöffnung (16), wherein the overflow channel opening (16) in the overflow region (2) opens.
[14]
14. Vorkammersystem according to claim 13, characterized in that, starting from the overflow channel (5) the overflow channel opening (16) opens substantially tangentially with respect to an inner wall (17) of the Vorkammersystems (1) in the overflow region (2).
[15]
15. Vorkammersystem according to at least one of claims 1 to 14, characterized in that starting from the ignition region (3), the connecting channel opening (15) in the direction of the overflow channel opening (16).
[16]
16. Vorkammersystem according to claim 15, characterized in that only a part of a cross section of the connecting channel opening (15) in the direction of the overflow channel opening (16).
[17]
17. Internal combustion engine (18) with a Vorkammersystem (1) according to at least one of claims 1 to 16. Innsbruck, on 24 September 2012

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法律状态:
2018-05-15| MM01| Lapse because of not paying annual fees|Effective date: 20170926 |

优先权:

申请号 | 申请日 | 专利标题

ATA1048/2012A|AT512532B1|2012-09-26|2012-09-26|Pre-chamber system for an internal combustion engine|ATA1048/2012A| AT512532B1|2012-09-26|2012-09-26|Pre-chamber system for an internal combustion engine|

EP13004470.4A| EP2713024A1|2012-09-26|2013-09-13|Pre-chamber system for a combustion engine|

US14/034,996| US9316144B2|2012-09-26|2013-09-24|Pre-chamber system for an internal combustion engine|

JP2013198135A| JP2014066245A|2012-09-26|2013-09-25|Pre-combustion chamber system of internal combustion engine|

KR1020130114631A| KR20140040666A|2012-09-26|2013-09-26|Pre-chamber system for an internal combustion engine|

CN201310738497.2A| CN103775191A|2012-09-26|2013-09-26|Pre-chamber system for an internal combustion engine|

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