JP2526324Y2 - Torch ignition device for torch ignition type gas engine - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a torch ignition device for a torch ignition type gas engine.

[0002]

2. Description of the Related Art A conventional example will be described with reference to FIGS. FIG. 3 is a cross-sectional view around a combustion chamber of a conventional ignition torch type gas engine, FIG. 4 is a detailed view of an ignition torch part, and FIG.
FIG. The combustion gas and air used for combustion are supplied to an intake port 10 in the cylinder head 101 through a fuel supply device and an air supply device (not shown) and a gas mixing device.
1b, it is introduced into the main combustion chamber 102a formed by the cylinder and the top of the piston during the suction stroke. On the other hand, the gas for the ignition torch is supplied to the gas valve 1 attached to the gas valve body 104 by the rocker arm 109 interlocked with an intake cam (not shown).
05 is pushed downward, the ignition gas supply pipe 11
From 0, the gas is introduced into an ignition pre-chamber 101a to which an ignition plug is attached through a passage 104a in the gas valve body 104.

In the compression stroke in which the cycle further proceeds, the piston 102 moves upward, and a part of the mixed gas in the cylinder 103 and the main combustion chamber 102a is transferred from the injection port 106a to the pre-chamber 101a through the injection port guide passage 106c. The mixture is further mixed with the ignition gas to form a rich mixture. When near the top dead center, an electric spark is sparked by the spark plug and ignites the mixed gas in the pre-chamber 101a.
The ignited flame is injected into the main combustion chamber 102a from a plurality of injection ports 106a, ignites the lean gas mixture in the main combustion chamber 102a, and complete combustion is performed entirely.

[0004]

However, during the compression stroke, the lean mixed gas in the main combustion chamber is discharged from the chamber injection port 106a through the injection port guide passage 106c as the piston rises.
Through the pre-chamber 101a and mixed with the igniting gas in the pre-chamber. However, since the orifice and the orifice guide passage and the pre-chamber are concentric and symmetric, the gas flow in the chamber is Since the vortex impinges on the upper gas valve from below the center, the vortex is attenuated and vortex in the pre-chamber is hardly expected.

[0005] As described above, since the mixed gas and the ignition gas from the main combustion chamber are not sufficiently mixed, the first ignition by the spark plug becomes unstable, and good combustion is not performed. Therefore, a strong ignition flame cannot be ejected from the injection port of the pre-chamber, so that complete combustion in the main combustion chamber is not performed, and a pollutant gas containing a large amount of HC, CO, etc. is discharged to lower the combustion efficiency. Therefore, this has been a major drawback of the torch-ignited gas engine used as a prime mover for cogeneration.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems of the conventional apparatus, to promote the mixing with the ignition gas in the pre-chamber, and to discharge a good combustion flame in the pre-chamber into the main combustion chamber, thereby providing a powerful combustion chamber. An object of the present invention is to provide a torch ignition device for a torch-ignition gas engine in which good combustion can be obtained in a main combustion chamber because an ignition flame is generated.

[0007]

SUMMARY OF THE INVENTION A torch igniter of a torch ignition type gas engine according to the present invention is provided with an ignition gas valve and an ignition plug in a torch, and has an injection port leading to a main combustion chamber. In the ignition device of the gas engine, the center y of the injection port guide passage portion 6c communicating the ignition pre-chamber 1a and the main combustion chamber 2a is set to the center X of the pre-chamber 1a.
In addition to being more eccentric, the nozzles 6a, 6b, 6a ', 6b' for injecting a flame into the main combustion chamber 2a are asymmetric with respect to the central axis y of the passage 6c.

[0008]

Since the present invention is constructed as described above, a strong vortex is generated in the pre-chamber, and the mixing with the previously flowing ignition gas is sufficiently promoted. In addition, since the injection port portion is asymmetrical with respect to the axis of the injection hole guide passage and L / d is not the same, turbulence occurs at the time of inflow and outflow from the injection port to the pre-chamber, and stable ignition and ignition in the pre-chamber. Performance, uniform combustion in the pre-chamber and complete combustion with low harmful gases in the main combustion chamber.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment will be described below with reference to FIGS. FIG. 2 is a cross-sectional view of the vicinity of the combustion chamber, and is a cross-sectional view taken along line AA of FIG. In this gas engine, a mixed gas composed of air and fuel gas is supplied from a suction valve (not shown) to a main combustion chamber 2a formed at the top of a cylinder and a piston (not shown) during a suction stroke.
Flows into. On the other hand, the ignition gas valve 5 opens in conjunction with an intake valve (not shown), and flows into the pre-chamber 1a through the ignition gas passage 4a provided in the gas valve body 4.

In the compression stroke, the mixed gas in the main combustion chamber 2a is compressed by the rise of the piston 2, and a part of the mixed gas is injected into the pre-chamber injection ports 6a, 6b, 6a ', 6b'.
And flows into the pre-chamber 1a through the nozzle guide passage 6c. The central axis y of the injection port guide passage 6c is the ignition gas valve 4
And the center axis X of the pre-chamber 1a is eccentrically provided by a length k. The injection ports 6a, 6b, 6a ', 6b' connecting the lower end of the injection port guide passage 6c and the main combustion chamber 2a are asymmetric with respect to the central axis y of the passage 6c. Further, the diameter of the holes 6a, 6a ', 6b, 6b' is the same or different, and the number of the holes is not particularly specified. Therefore, spout 6
Since the lengths L of a and 6b are not the same, turbulence occurs due to a difference in inflow velocity in the mixed gas flowing into the injection port guide passage 6c.

When the mixed gas containing the small turbulence flows into the pre-chamber 1a, the pre-chamber rises along the left side wall of the pre-chamber 1a because the pre-chamber is eccentric with the injection port guide passage 6c, and is moved from above to the left. The vortex swirls in the direction and mixes with the ignition gas that has flowed in earlier. When the piston 2 approaches the top dead center after the compression stroke, the spark plug 7 sparks by an electric signal, is ignited by the mixed gas, and the flame propagates into the pre-chamber 1a. Since the well-mixed gas forms a good combustion flame, the combustion is further accelerated by the remaining vortex and small turbulence in the pre-chamber 1a. Therefore, the pressure of the fuel in the pre-chamber 1a rises at the same time as the ignition, and the combustion flame due to the pressure difference is ejected from the injection ports 6a, 6b into the main combustion chamber 2a through the injection ports and the guide passage 6c.

The mixed gas in the main combustion chamber 2a is ignited by the emitted flame, and the flame propagates to the whole, so that the combustion in the main combustion chamber 1a proceeds. The good combustion gas obtained in the pre-chamber 1a in this way becomes a strong ignition flame and is jetted into the main combustion chamber 1a, so that good combustion is promoted in the main combustion chamber 1a. As described above, not only the combustion in the pre-chamber 1a but also the combustion in the main combustion chamber is promoted.
The generation of harmful exhaust gases such as C and CO can be suppressed and the combustion efficiency can be improved.

[0013]

The torch igniter of the torch ignition type gas engine of the present invention is constructed as described above, so that a swirl flow is generated in the pre-chamber and a small turbulence occurs at the same time. Mixing with the gas is promoted, and the sustained vortex further promotes post-ignition combustion. Further, the good combustion flame in the pre-chamber is ejected as a strong ignition flame into the main combustion chamber during the explosion stroke, so that the combustion in the main combustion chamber is promoted and good combustion is obtained. As described above, the generation of harmful exhaust gas such as HC and CO can be reduced and the combustion efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view around a combustion chamber according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a longitudinal sectional view of a conventional torch ignition type gas engine.

FIG. 4 is a diagram corresponding to FIG. 1 of a conventional example.

FIG. 5 is a diagram corresponding to FIG. 2 of a conventional example.

[Explanation of symbols]

 1a Pre-chamber 2a Main combustion chamber 6c Injection guide passage 6a, 6a ', 6b, 6b' Injection

Claims (1)

(57) [Scope of request for utility model registration] 1. An ignition device for an ignition torch type gas engine having an ignition gas valve and an ignition plug in a torch and having an injection port leading to a main combustion chamber, wherein an ignition pre-chamber (1a) and a main combustion chamber are provided. The center (y) of the nozzle guide passage portion (6c) communicating with (2a) is eccentric from the center (x) of the pre-chamber (1a), and the nozzle (6a) for blowing out a flame to the main combustion chamber (2a). , 6b, 6a ', 6b') asymmetrically with respect to the central axis (y) of the passage portion (6c).