Patent ID: 8701625
Filing Date: 2014-04-22
Classification: F02B,Y10T

Abstract:
1. A predetermined breaking component suited for closing an emergency relief duct leading through an outer wall of a combustion chamber of a Diesel engine, wherein the combustion chamber is enclosed on multiple sides by a cylinder, as well as by at least one upper side of at least one piston moving up and down in the cylinder, which form the outer wall of the combustion chamber, and wherein the emergency relief duct is provided in the outer wall, characterized in that the predetermined breaking component is suited to protect a two stroke crosshead large Diesel engine with longitudinal scavenging against possible damage that can be caused by an undesirably high overpressure (py) of gases in the combustion chamber during a malfunction of the Diesel engine, the predetermined breaking component comprises: a predetermined breaking point provided for said outer wall, which breaks on a predetermined breaking pressure (ps) which is below the overpressure (py) above which the damage is expected, and above a combustion chamber normal pressure (pn) foreseen maximally during normal engine operation conditions, wherein: with a predetermined breaking pressure (ps) which at any temperature (T) in a temperature range (T the threshold pressure (pu) is preferably at least by a triggering pressure amount (Δpu) higher than the combustion chamber normal pressure (pn) occurring at maximum under normal engine operating conditions and/or the limit pressure (po) is at least by a safety pressure amount (Δpo) lower than the lowest overpressure (py) where damages are to be expected, and wherein the threshold pressure (pu) in the temperature range occurring in said combustion chamber is preferably always by more than 10% higher than the combustion chamber normal pressure (pn) occurring at maximum under normal motor operating conditions, and is more preferably greater than 180 bar, wherein the limit pressure (po) is more preferably smaller than 270 bar; and said predetermined breaking point is formed on a ring-shaped circumferential border around a predetermined breaking plate portion which border is thin-walled compared with the surrounding outer wall and convexly curved towards the combustion chamber and the predetermined breaking component is formed integrally with a predetermined breaking plate portion.