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Pre-chamber arrangement for a piston engine

A piston engine, pre-combustion chamber technology, applied in the direction of internal combustion piston engines, engine components, combustion engines, etc., can solve the problems of complexity, hindering valve control, etc.

Active Publication Date: 2009-11-18
WARTSILA FINLAND OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this arrangement is its complexity, since the prechamber valve requires its own cam, pushrod and rocker arm
In addition, the lift of the pre-chamber valve, i.e. the stroke length between the limit positions is short, which hinders the control of the valve

Method used

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  • Pre-chamber arrangement for a piston engine
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  • Pre-chamber arrangement for a piston engine

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Embodiment Construction

[0011] Figure 1 to Figure 6 A part of the piston engine 1 is shown, more precisely the upper part of its cylinders. For clarity, oblique hatching indicating cross-sectional areas has been omitted. Piston engine 1 comprises an engine block with a plurality of cylinders 3 . Engine 1 is an Otto-cycle engine, ie a mixture of fuel and combustion air is ignited by a spark plug. The fuel used in the engine is gas, such as natural gas. The engine 1 also comprises a cylinder head 2 which, together with pistons and cylinder liners, defines a combustion chamber 5 of the cylinder. The cylinder head 2 is provided with an inlet port 6 to the combustion chamber 5 , via which inlet a mixture of fuel and air is introduced into the combustion chamber 5 . In inlet port 6 fuel is mixed with combustion air. The flow of the mixture of fuel and combustion air from the inlet port 6 into the combustion chamber 5 is controlled by an inlet valve 7 . The cylinder head 2 is also provided with an out...

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Abstract

A prechamber arrangement adaptable in the upper part (2) of a cylinder in a piston engine (1), the prechamber arrangement comprising a prechamber (17), a spring-loaded prechamber valve (19) provided with a piston surface (32) for feeding a mixture of combustion air and fuel into the prechamber (17), and ignition means (20) for igniting the mixture of combustion air and fuel in the prechamber (17), which prechamber valve (19) can be moved between an open and closed position and which is pressed toward the closed position by a spring (24). The prechamber arrangement (15) comprises a chamber (28) for pressure medium and a second chamber (27) for pressure medium in flow connection with the chamber (28), which is delimited by the piston surface (32) of the prechamber valve on which the pressure of the pressure medium acts to move the prechamber valve (19) toward the open position, and which second chamber (27) is delimited by the piston surface (31) of a movable second piston (29).

Description

technical field [0001] The invention relates to a pre-combustion chamber device applicable to the upper part of the engine cylinder in a piston engine. Background technique [0002] Nitrogen oxides (NOx) are formed when a mixture of fuel and air is combusted in a combustion engine. Generally, the total amount of nitrogen oxides increases at the same time as the combustion temperature increases. Specifically, high extreme combustion temperatures favor the formation of nitrogen oxides. By increasing the air / fuel ratio of the fuel mixture, ie by using a leaner mixture, the extreme combustion temperature can be reduced and thereby reduce the total amount of nitrogen oxides formed during the combustion process. However, especially in piston engines with large cylinder diameters, the combustion is incomplete due to the lack of fuel in the fuel mixture. [0003] To improve combustion efficiency, some lean-burn engines have a pre-chamber connected to the combustion chamber of the...

Claims

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Application Information

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IPC IPC(8): F02B19/10
CPCY02T10/125F02B19/1042Y02T10/12F02B19/10F02B19/02F01L1/12
Inventor S·尼尼坎加斯M·桑德斯滕
Owner WARTSILA FINLAND OY
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