Its
cooling system uses water as the cooling medium, and then dissipates heat
through cooling water tank and fan to ensure the normal working temperature of
the diesel engine.
The
water cooling system consists of water pump, radiator, fan, thermostat, water
jacket and water pipe. The coolant of the water cooling system is located in
the water jacket of the engine. The temperature of the high temperature machine
is absorbed and the temperature rises, the radiator is cooled by fans and
upwind airflow, and then the coolant is pumped into the water jacket for cyclic
cooling.
There
are two ways of circulating coolant: the thermostat closes when the engine
water temperature is below 70 °C, coolant flows through pump, water jacket,
heater bypass pipe, pump (without radiator), that is small circulation, this is
conducive to rapid temperature rise after engine start-up; When the water
temperature of the engine exceeds 70 °C, the thermostat opens automatically,
and the coolant flows through the pump, water jacket, temperature control
switch valve, radiator and water pump, that is, the large circulation, to
enhance the cooling effect. Coolant is usually soft water to reduce the scale
deposition in the inner wall of radiator and water jacket, affecting the heat
dissipation effect. We need to use antifreeze in cold areas or in winter.
Water
cooling systems usually have auxiliary containers (also known as expansion
boxes), which are connected to radiators. When the coolant is heated and
expanded to form steam, the steam valve on the radiator cover stores water and
steam overflowing the radiator during cooling. When the liquid cools down, it
can be supplemented to the radiator by a drain valve.
The
cylinder of water-cooled engine is cast with complex cooling water channel (dry
cylinder liner) or forms cooling water channel (wet cylinder liner) with
cylinder liner. The piston works in the cylinder liner and the heat is
transferred through the cylinder liner to the cooling water in the water
channel to implement cooling. This method is usually used in four-stroke
engines.
Characteristics of
water-cooled generators:
1.Water
cooling systems has many requirements for environment, complex structure and
relatively difficult manufacturing. When used in plateau, the boiling point of
water decreases, and easy to freeze in alpine region when shutdown occurs. It
is necessary to improve the boiling point and freezing point by adding a
certain proportion of additives;
2.The
effect of water cooling is ideal. The generator with the same technical
parameters has small volume, light weight, high energy density and good heat
transfer performance;
3.Water
cooling generator is the most common type, such as Cummins, Volvo, Perkins etc.
Widely used in agricultural machinery, construction machinery, automobile
industry, marine machinery, electric power industry and other fields.
Air-cooled diesel
generator:
Engine
cylinder block and cylinder liner of air-cooled diesel generator set integrate
or connect to clearance-free unit. The inner part is the working area of piston
sliding, and the outer part is uniformly arranged and radiated intensively.
Usually, materials with high thermal conductivity are die-cast. The working
heat of the piston is transferred directly through the cylinder and is carried
away by the flowing air between the radiators. This method is usually used in
two-stroke engines.
Air
cooling uses air as cooling medium. High-speed air directly removes heat from
high-temperature components to reduce engine temperature. Air cooling is
divided into natural air cooling and forced air cooling. Natural air cooling is
the direct cooling of cylinder head, cylinder and other components by the air
flow generated by mechanical movement. In order to improve the efficiency of
heat dissipation, air-cooled engine uses to increase the heat dissipation area
of engine surface, that is, casting the body of radiator on the outer surface
of cylinder head, cylinder liner and cylinder, etc.
At
higher temperatures, such as near the combustion chamber and exhaust port, the
heat dissipation area is larger. Radiator should be smooth and clean to improve
heat dissipation performance; forced air-cooled fan should be used to increase
the flow rate of air passing through the radiator to improve cooling effect.
That is to say, the engine itself drives the fan to increase the flow rate and
velocity of the air flow, and reliably cools the cylinder head, cylinder liner,
cylinder block and so on by reasonably distributing the air guide hood.
Characteristics of
air-cooled generators:
1.The
air-cooled generator set must be installed in the open room. The noise is
bigger and the cooling effect is not as good as that of water cooling;
2.The
biggest advantages are simple structure, easy maintenance, less air
requirement, low fuel consumption, and no risk of frost cracking or superheated
boiling;
3.Air-cooled
diesel generators are suitable for plateau or water shortage, cold places, you
do not need to add water and worry about boiling point, freezing and other
issues, due to heat load and mechanical load limitations, power is generally
relatively small.
If
you plan to have a diesel generator, depending on your requirement, i think you
have known which is better after learn the above information. Starlight manufacturer
will provide professional technical support and high quality generator set all
the time, welcome to inquiry.
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