Engine cooling system and method

Abstract

The invention provides a cooling system and method of an internal combustion engine, in particular to a cooling system and method of a marine diesel engine. Double heat exchangers are adopted and arranged in a high temperature branch and a low temperature branch correspondingly, internal cooling liquid are divided into a first internal cooling liquid branch and a second internal cooling liquid branch after being heated by an engine body, and the first internal cooling liquid branch comprises a first thermostat, the vice heat exchanger and a high temperature stage intercooler; the second internal cooling liquid branch comprises a second thermostat, the main heat exchanger and a lower temperature stage intercooler; and internal cooling liquid passing through the first internal cooling liquid branch and the second internal cooling liquid branch are converged and then returns to the engine body to form a closed cooling loop. According to the cooling system, size requirement of a whole engine is met, cooling system cost is lowered, the reliability of the cooling system is improved, and the combustion condition of the engine is improved.

Description

technical field [0001] A cooling system and method for an internal combustion engine, especially a cooling system and method for a marine diesel engine. Background technique [0002] The existing circulating waterway technology of the marine engine cooling system is: the coolant flows through the engine through the fresh water pump, and the water temperature rises, and then realizes large and small circulation through the thermostat, and returns directly to the fresh water pump through a small circulation when the water temperature is low. When the water temperature is high, it passes through the heat exchanger and is cooled before returning to the fresh water pump; the sea water pump first introduces sea water into the intercooler to cool the intake air of the engine, and then flows through the heat exchanger to cool the engine coolant, see figure 1 . [0003] First, in the above-mentioned marine engine (diesel engine) cooling system, the intercooler is cooled by externall...

AI Technical Summary

Problems solved by technology

[0003] First, in the above-mentioned marine engine (diesel engine) cooling system, the intercooler is cooled by externally circulated seawater, which is poor in water quality and highly corrosive, and may easily cause blockage or even water leakage of the intercooler; seawater pipelines must use copper pipes, and the pipelines Complex layout and many piping systems increase the cost of the engine; the cleanliness of seawater cannot be guaranteed; the above reasons result in poor cooling reliability of the intercooler; and the engine is in a low-temperature environment or under low load, the intake temperature is very low, and the performance is poor

Second, although the marine engine has already used coolant to cool the intercooler, which has improved the cooling reliability of the system to a certain extent, the coolant pipeline can be cast on the engine body, and the compactness is also stronger; but the existing intercooler The heat exchanger required by the diesel engine has a high heat dissipation and a large volume, which is contrary to the high requirements of the diesel engine for the overall size.

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