JPS628379Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field of the invention] This invention is a diesel engine that uses dual fuel, with gas fuel as the main fuel and a small amount of liquid fuel as ignition fuel, a so-called dual fuel engine. This relates to the arrangement structure of the injection valve.

[Prior art]

In a typical conventional dual fuel engine that uses dual fuel, gas fuel is injected from the main fuel valve into the cylinder at the beginning of the intake stroke or compression stroke of the combustion air, and the piston Compress the mixture of gas fuel and air by
When the piston reaches near top dead center, a small amount of liquid fuel for ignition, so-called pilot fuel, is injected from the pilot valve to ignite and burn the main fuel. There was no need to particularly regulate the relative positions of the main fuel valve for gaseous fuel and the pilot valve for liquid fuel.

On the other hand, in the case of this type of dual-fuel engine, in order to burn the dual fuel more effectively and stably, the cycle is similar to that of a normal diesel, that is, only compresses air during the compression stroke. A method has been proposed in which high-pressure gas fuel is injected from the main fuel valve into the combustion chamber when the piston reaches near top dead center, and at the same time, pilot fuel is injected from the pilot valve to ignite and burn the piston. ing.

However, even in this method, the arrangement of the fuel injection valves with respect to the cylinder is such that, for example, one main fuel valve for gas fuel is installed on the cylinder center axis, and one pilot valve for ignition is installed at a different position. The arrangement of the main fuel valve and pilot valve is
Because it does not take into account the so-called symmetry of combustion, uneven combustion tends to occur within the cylinder, and complete combustion cannot be achieved and the proper and effective combination of gas fuel and combustion air is not achieved. There was a sense of regret that this system was not utilized effectively, and this was particularly noticeable in the case of large-bore cylinder engines.

[Summary of the idea]

In consideration of the above-mentioned drawbacks of the conventional technology, this invention provides a fuel injection valve which incorporates a main fuel valve for injecting gas fuel and a pilot valve for injecting ignition fuel which ignites the gas fuel injected from the main fuel valve and burns it, and arranges a plurality of these fuel injection valves at symmetrical positions at equal angular intervals about the center axis of the cylinder, thereby making it possible to obtain symmetrical, uniform, complete combustion.

〔Example〕

Hereinafter, one embodiment of the fuel injection valve arrangement structure according to this invention will be described in detail with reference to the drawings.

The drawing is an explanatory plan view of the arrangement structure according to this embodiment. In this drawing, 1 is the cylinder of the dual fuel engine, 2 is its cylinder chamber,
3 is the center axis of the cylinder as above. In this embodiment structure, a main fuel valve injects gas fuel;
A fuel injection valve 4 is provided which integrally incorporates a pilot valve for injecting ignition fuel to ignite and burn gaseous fuel injected from the main fuel valve. With respect to the central axis 3, they are arranged at equal angular intervals and symmetrically within the cylinder chamber 2, so that the injection of gaseous fuel and ignition fuel from one fuel injection valve 4 intersects with the same injection from other fuel injection valves. The injection direction is positioned so that it does not occur.

Specifically, as shown in the drawing, 2
The fuel injection valves 4 of the set are arranged symmetrically with respect to the cylinder center axis 3 at equal angular intervals of 180°, and the injection directions of the respective valves 4 do not intersect with each other, that is, the gas fuel to be injected, The ignition fuel is prevented from mixing with each other in its injection region, and combustion by the gas fuel injection from each fuel injection valve and the corresponding ignition fuel injection are performed without mutual interference. It is something.

Therefore, in the arrangement structure according to this embodiment,
The gas fuel injected from each fuel injection valve 4 is
The surrounding combustion air is sufficiently drawn in and diffused over a predetermined area, and the fuel is ignited by the ignition fuel that is injected before the gas fuel injection timing, and the fuel is arranged at symmetrical positions. As a result, in the cylinder chamber 2, uniform combustion progresses simultaneously at symmetrical positions with respect to the cylinder center axis 3, resulting in effective output. This is particularly noticeable in dual fuel engines using large diameter cylinders.

[Effect of idea]

As detailed above, according to this invention, in the fuel injection valve arrangement of a dual-fuel engine, a plurality of fuel injection valves, each of which is an integral combination of a main fuel valve and a pilot valve, are arranged in the cylinder chamber with respect to the central axis. They are arranged at equal angular intervals and in symmetrical positions, and the injections of gas fuel and ignition fuel from each fuel injection valve do not intersect with each other to allow ignition and combustion. can ensure symmetry and uniformity of
Complete combustion, ie, proper and effective utilization of gaseous fuel and combustion air, can be achieved.

[Brief explanation of the drawing]

The drawing is an explanatory plan view showing one embodiment of the fuel injection valve arrangement structure according to the invention. 1...Cylinder, 2...Cylinder chamber, 3...Cylinder center axis, 4...Fuel injection valve integrally incorporating a main fuel valve and a pilot valve.

Claims (1)

[Scope of utility model registration request] A fuel injection valve is provided which integrally incorporates a main fuel valve that injects gaseous fuel and a pilot valve for igniting fuel injection that ignites the gaseous fuel injected from the main fuel valve. multiple pieces,
The dual fuel injection valve is characterized in that it is arranged in symmetrical positions at equal angular intervals with respect to the cylinder center axis in the cylinder chamber, and that the injection directions of the gas fuel and ignition fuel of each fuel injection valve are positioned and regulated so that they do not intersect with each other. Arrangement structure of fuel injection valves in fuel engines.