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COOLING SYTEM
Tài liệu
COLING SYTEM
Nguồn: khoa hang2 hải
All internal combustion engines produce heat as a byproduct of combustion and
friction. This heat can reach temperatures up to 1925°C (3500°F) and can have
catastrophic affects on engine components. Pistons, valves and cylinder heads
must be cooled to reduce the risk of detonation. Cylinder temperatures need to be
controlled so lubricating oil can maintain a protective film on the cylinder surfaces
and the lubricating oil should be cooled to ensure its integrity.
In addition to overheating, overcooling can have negative effects on the engine.
Overcooling can reduce engine performance and shorten the engine’s service life.
Cooling systems are used to manage engine heat. Cooling systems must be properly
designed, operated and maintained for proper engine operation and service life. This
guide describes and explains methods of managing engine heat for various engine
applications.
When the engine is cold, the
temperature regulators bypass the
radiator and direct the coolant back
to the water pump. As the temperature
of the bypass coolant flow becomes
warmer, the temperature regulators
begin to open and permit some of
the coolant to flow to the radiator.
The regulator opens to maintain the
correct engine temperature. The amount
that the regulator opens and the percent
of coolant flow to the radiator depends
on the load on the engine, and the
outside air temperature.
The fan pushes or pulls air through
the radiator and around the tubes that
extend from the top to the bottom of
the radiator. When the hot coolant goes
through the tubes in the radiator, the
flow of air around the tubes lowers the
temperature of the coolant. The coolant
then flows back through the water
pump.
Coolant expands as it is heated.
Expansion tanks are used on some
applications to contain the increased
volume.
