PRE-COMBUSTION-CHAMBER TYPE GAS ENGINE

摘要

An object is to improve a trap effect to trap ignition fuel gas supplied to a pre-combustion chamber and reduce an amount of non-combusted ignition fuel gas flowing out of the pre-combustion chamber to suppress a decrease in combustion efficiency. A pre-combustion-chamber type gas engine includes: a pre-combustion chamber Sr disposed on a cylinder head portion 10; a spark plug 20 disposed on an upper part of the pre-combustion chamber Sr; a pre-combustion-chamber gas supply mechanism configured to supply ignition fuel gas “g” to the pre-combustion chamber Sr via gas supply channels for the pre-combustion chamber 22a and 22b with an opening on an upper part of the pre-combustion chamber Sr; and a check valve 24 disposed in the gas supply channel 22b for the pre-combustion chamber. The opening of the gas supply channel 22a for the pre-combustion chamber is disposed on a lower surface of a cover member 16 forming the pre-combustion chamber Sr or on an upper section of a side wall of a pre-combustion-chamber member 14, the opening facing in a tangent direction of a side-wall inner peripheral surface 14a of the pre-combustion-chamber member 14. The ignition fuel gas “g” supplied to the pre-combustion chamber Sr forms a swirl flow s1 which swirls about a longitudinal axis x of the pre-combustion chamber Sr inside the pre-combustion chamber Sr.

主权项

1. A pre-combustion-chamber type gas engine, comprising:
a pre-combustion chamber disposed on a cylinder head portion; a spark plug disposed on an upper part of the pre-combustion chamber; a pre-combustion-chamber gas supply mechanism configured to supply ignition fuel gas to the pre-combustion chamber via a gas supply channel for the pre-combustion chamber, the gas supply channel having an opening on an upper part of the pre-combustion chamber; and an opening-closing valve configured to open and close the gas supply channel for the pre-combustion chamber, wherein the opening of the gas supply channel for the pre-combustion chamber is disposed on an upper wall of a partition wall forming the pre-combustion chamber or on an upper section of a side wall of the partition wall, the opening facing in a tangent direction of a side-wall inner peripheral surface forming the pre-combustion chamber, wherein the ignition fuel gas supplied to the pre-combustion chamber forms a first swirl flow which swirls about a longitudinal axis of the pre-combustion chamber inside the pre-combustion chamber, wherein the gas supply channel for the pre-combustion chamber is disposed outside the partition wall forming the pre-combustion chamber, and is connected to the upper section of the side wall forming the pre-combustion chamber, wherein the gas supply channel for the pre-combustion chamber extends downward toward the pre-combustion chamber from above the pre-combustion chamber, and wherein a pocket portion is disposed on a joint between the gas supply channel for the pre-combustion chamber and the partition wall forming the pre-combustion chamber, the pocket portion including
an interior space into which the ignition fuel gas flows from the gas supply channel for the pre-combustion chamber, anda communication hole through which the interior space and the pre-combustion chamber communicate with each other, the communication hole having an opening facing in a tangent direction of the side-wall inner peripheral surface of the pre-combustion chamber.