Fuel gas supply device for gas engine

Abstract

Provided is a fuel gas supply device for a gas engine. It is an object of the present invention to achieve the improvement of the combustion efficiency in the combustion chamber and the improvement of the fuel consumption rate by forming, in the inner circumferential surface of a sleeve into which a projection provided at an inlet valve rod is slidably fitted, fuel gas injection holes situated within the movement region of the projection of the inlet valve rod and opened and closed with the movement of the inlet valve rod, such that the fuel gas injection holes are each formed in an ellipse, to thereby lengthen the injection period of the fuel gas injected into an inlet path and promote mixing with the supply air through the inlet path. In the fuel gas supply device for the gas engine, a fuel gas flows along the axial direction on the outer circumferential side of an inlet valve rod (4), and is supplied to an inlet path (2) in a cylinder head (1). The device is characterized in that fuel gas injection holes (6a) to be opened and closed with the movement of a projection (5) are provided in the inner circumferential surface of a sleeve (6) into which the projection (5) is slidably fitted, the projection (5) being provided at the inlet valve rod (4), having a larger outer diameter than the inlet valve rod (4) and having a portion concentric with and in parallel with the inlet valve rod (4), and in that the fuel gas injection holes (6a) are each formed in an ellipse, and the opening upper and lower end region part of the ellipse is situated within the movement region of the projection (5).

Description

technical field [0001] The present invention relates to a combustible gas supply device for supplying combustible gas of a gas engine into an intake passage. Background technique [0002] In a gas engine, as an example of mixing combustible gas with air flowing through an intake passage, an injection nozzle is connected to a gas supply pipe, and the combustible gas is injected from the nozzle into an air supply manifold. [0003] In this case, since the injection nozzle of the combustible gas protrudes into the intake manifold, the flow of air in the intake manifold is disturbed, and the flow resistance of the intake air tends to increase. [0004] In a conventional gas engine that supplies combustible gas to an intake passage, as disclosed in Japanese Patent Application Laid-Open No. 9-268923 (Patent Document 1), for example, the gas injection nozzle is installed across the intake pipe. The gas injection nozzle acts as a resistance to the flow of intake air, and the amount...

AI Technical Summary

Problems solved by technology

[0015] However, according to the structure of Patent Document 2, when the combustible gas injected into the intake passage 2 is injected in a short time, the agitation between the combustible gas and the intake air in the intake passage 2 may not be sufficiently completed.

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