Pre-combustion-chamber type gas engine

Patent metadata

Field	Value
Publication number	US-2016245151-A1
Application number	US-201415026169-A
Country	US
Kind code	A1
Filing date	Oct 20, 2014
Priority date	Oct 21, 2013
Publication date	Aug 25, 2016
Grant date	—

Abstract

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 22 a and 22 b with an opening on an upper part of the pre-combustion chamber Sr; and a check valve 24 disposed in the gas supply channel 22 b for the pre-combustion chamber. The opening of the gas supply channel 22 a 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 14 a of the pre-combustion-chamber member 14 . The ignition fuel gas “g” supplied to the pre-combustion chamber Sr forms a swirl flow s 1 which swirls about a longitudinal axis x of the pre-combustion chamber Sr inside the pre-combustion chamber Sr.

First claim

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, and
a 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.

2 - 3 . (canceled)

4 . The pre-combustion-chamber type gas engine according to claim 1 ,
wherein the pocket portion is formed inside the partition wall forming the pre-combustion chamber.

5 . The pre-combustion-chamber type gas engine according to claim 1 ,
wherein the side-wall inner peripheral surface of the pre-combustion chamber including the opening of the gas supply channel for the pre-combustion chamber has a region cut out to have a cutout surface formed into an arc shape, the region being on a side toward which the ignition fuel gas flows from the opening of the gas supply channel for the pre-combustion chamber.

6 . The pre-combustion-chamber type gas engine according to claim 1 ,
wherein air-fuel mixture flowing into the pre-combustion chamber via a nozzle formed on an end portion of the pre-combustion chamber from a main combustion chamber forms a second swirl flow which swirls about the longitudinal axis of the pre-combustion chamber inside the pre-combustion chamber, the second swirl flow swirling in a direction opposite to a swirl direction the first swirl flow.

Assignees

• Mitsubishi Heavy Ind Ltd

Inventors

• Yuuki Akihiro
• Takemoto Daisuke
• Furukawa Yuta

Classifications

• F02B19/08 Primary

  the chamber being of air-swirl type · CPC title

• F02B43/04

  for improving efficiency of combustion · CPC title

• F02B19/12

  with positive ignition (engines with non-timed positive ignition, and with incandescent chambers F02B9/08) · CPC title

• F02M21/0242

  Shut-off valves; Check valves; Safety valves; Pressure relief valves · CPC title

• F02M21/02

  for gaseous fuels · CPC title