Gas engine and ship provided with same

Patent metadata

Field	Value
Publication number	US-11608798-B2
Application number	US-201816958101-A
Country	US
Kind code	B2
Filing date	Jul 25, 2018
Priority date	Mar 16, 2018
Publication date	Mar 21, 2023
Grant date	Mar 21, 2023

Abstract

The purpose of the present invention is to provide a gas engine and a ship provided with the same, the gas engine making it is possible to ensure a distance that enables fuel and an oxidizing agent to mix, and to evenly mix the oxidizing agent and the fuel even if the flow rate of gas traveling towards intake pipes varies. A gas engine ( 1 ) comprises: an intake passage ( 10 ) through which a gas flows; a plurality of intake pipes ( 12 A, 12 B) where the intake passage ( 10 ) branches apart at a branching section ( 14 ) that is downstream in the gas flow direction, the intake pipes opening to a cylinder ( 16 ) at the downstream end; and a fuel injection means ( 31 ) that injects fuel into the intake passage ( 10 ). The fuel injection means ( 31 ) is provided upstream of the branching section ( 14 ) in the gas flow direction, and injects varying quantities of fuel into the plurality of intake pipes ( 12 A, 12 B).

First claim

The invention claimed is:

1. A gaseous-fueled engine comprising:
an intake air channel forming an air channel through which air flows;
first and second intake pipes in which the intake air channel is branched at a branching portion, the first and second intake pipes being located downstream in a flow direction with respect to the branching portion and being open to a cylinder in a downstream end; and
fuel injecting means for injecting fuel into the intake air channel,
wherein the first and second intake pipes are designed so that, in the intake air channel, an air flow directed toward the first intake pipe is faster than an air flow directed toward the second intake pipe, and
the fuel injecting means is disposed upstream of the branching portion in the gas flow direction, and is designed to inject different amounts of the fuel into the first and second intake pipes, so that an amount of the fuel injected into the first intake pipe is larger than an amount of the fuel injected into the second intake pipe and a concentration of the mixed gas of air and fuel to be supplied via the first intake pipe to the cylinder and a concentration of the mixed gas of air and fuel to be supplied via the second intake pipe to the cylinder are made uniform.

2. The gaseous-fueled engine according to claim 1 ,
wherein the fuel injecting means includes a single injecting pipe having injecting ports formed in a first row and second injecting ports formed in a second row, and
each port has an opening area and a total opening area of the first injecting ports directed in a direction toward the first intake pipe is different from a total opening area of the second injecting ports directed toward the second intake pipe.

3. The gaseous-fueled engine according to claim 2 ,
wherein in the plurality of injecting ports belonging to the injecting pipe, the first injecting ports directed in the direction toward the first intake pipe have the same area that is different from the same opening area of the second injecting ports directed in the direction toward the second intake pipe.

4. The gaseous-fueled engine according to claim 3 ,
wherein the fuel injecting means includes a rotation mechanism configured to rotate the injecting pipe around an axis.

5. The gaseous-fueled engine according to claim 3 ,
wherein the plurality of injecting ports are formed toward a downstream side in the gas flow direction.

6. The gaseous-fueled engine according to claim 2 ,
wherein the first and second injecting ports have the same opening area, and the number of the first injecting ports directed in the direction toward the first intake pipe is different from the number of the second injecting ports directed in the direction toward the second intake pipe.

7. The gaseous-fueled engine according to claim 6 ,
wherein the fuel injecting means includes a rotation mechanism configured to rotate the injecting pipe around an axis.

8. The gaseous-fueled engine according to claim 6 ,
wherein the plurality of injecting ports are formed toward a downstream side in the gas flow direction.

9. The gaseous-fueled engine according to claim 2 ,
wherein the fuel injecting means includes a rotation mechanism configured to rotate the injecting pipe around an axis.

10. The gaseous-fueled engine according to claim 2 ,
wherein the plurality of injecting ports are formed toward a downstream side in the gas flow direction.

11. A ship comprising:
the gaseous-fueled engine according to claim 1 .

Assignees

• Mitsubishi Heavy Ind Engine & Turbocharger Ltd

Inventors

• Shuto Shintaro
• Yamada Satoshi
• Hotta Kazuro
• Noguchi Tomohiro
• Iizuka Kenichi
• Nakamura Yuki

Classifications

• F02M69/00

  Low-pressure fuel-injection apparatus {; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel} · CPC title

• F02B1/04

  with fuel-air mixture admission into cylinder · CPC title

• F02B43/00

  Engines characterised by operating on gaseous fuels; Plants including such engines (engines characterised by the gas-air charge being ignited by compression ignition of an additional fuel F02B7/06; engines convertible from gas to other fuel consumption F02B69/04) · CPC title

• F02M21/02 Primary

  for gaseous fuels · CPC title

• F02M61/04

  having valves {, e.g. having a plurality of valves in series} · CPC title