The cooling system of diesel generator set is an auxiliary system of diesel generator, which plays an important role in the normal operation of diesel generator. Its principle is to timely dissipate the heat generated by the combustion gas absorbed by engine components, so as to promote the engine to maintain at appropriate temperature conditions, prevent component temperatures from being too high, and extend its service life, So that the engine can fully unleash its strong and stable power, let's understand what components the cooling system of a diesel generator set consists of.

The cooling system of diesel generators is a forced circulation water cooling system, which uses a water pump to increase the pressure of the coolant and force the coolant to circulate in the diesel generator. The cooling system mainly consists of a water pump, radiator, cooling fan, thermostat, water jacket in the diesel generator body and cylinder head, as well as auxiliary devices.

1. Cooling fluid

Cooling liquid, also known as antifreeze in winter, is a liquid composed of antifreeze additives, additives to prevent metal corrosion, and water. It needs to have anti freezing, anti-corrosion, thermal conductivity, and non deteriorating properties. Regularly using ethylene glycol as the main component, adding anti-corrosion additives and antifreeze with water.

2. Thermostat

When introducing the cooling cycle, it can be seen that the thermostat determines whether to follow a "cold car cycle" or a "normal cycle". The thermostat opens after 80 ℃ and reaches its maximum opening at 90 ℃. If the thermostat cannot be turned off, it will cause the cycle to enter the normal cycle from the beginning, which will result in the diesel generator not being able to reach the normal temperature as soon as possible or unable to reach it. If the thermostat cannot be opened or cannot be opened flexibly, it will prevent the coolant from circulating through the radiator, causing the temperature to be too high or normal when it is too high. If overheating occurs due to the inability of the thermostat to open, the temperature and pressure of the upper and lower water pipes of the radiator will be different.

3. Water pump

The function of the water pump is to pressurize the coolant and ensure its circulation in the cooling system. The malfunction of a water pump is usually caused by damage to the water seal, resulting in leakage, and bearing defects causing abnormal rotation or noise. When overheating occurs in diesel generators, the first thing to pay attention to is the water pump belt and check if the belt is broken or loose.

4. Radiator

When a diesel generator is operating, the coolant flows inside the radiator core, and air passes outside the radiator core. The hot coolant cools down due to the heat dissipated from the air. There is also an important small component on the radiator, which is the radiator cover, which is easily overlooked. As the temperature changes, the coolant will expand and contract. The internal pressure of the radiator increases due to the expansion of the coolant. When the internal pressure reaches a certain level, the radiator cover opens and the coolant flows into the storage tank; When the temperature drops, the coolant flows back into the radiator. If the coolant in the reservoir does not decrease, but the radiator liquid level decreases, then the radiator cap will not work.

5. Cooling fan

The function of diesel generator fan is to expand the air flow rate through the core of the radiator, enhance the heat dissipation function of the radiator. Diesel generator fan usually has the characteristics of large exhaust volume, obvious cooling effect, and low noise. Depending on the model and rated power of the diesel generator set, different specifications and models of fans can be selected. The fan has two structural features: suction and blowing, Users can freely choose one type when placing an order as needed

6. Water temperature sensor

The water temperature sensor is actually a temperature switch. When the inlet water temperature of the diesel generator exceeds 92 ℃, an alarm will sound and a forced shutdown will occur.

7. Thermostat

When the coolant temperature drops below the specified value, the paraffin in the temperature sensing body of the thermostat becomes solid. Under the action of the spring, the thermostat valve closes the channel between the engine and the radiator, entering a small cycle. When the temperature of the coolant reaches the specified value, paraffin begins to melt and gradually turns into a liquid. The volume increases and compresses the rubber tube, causing it to contract. While the rubber tube contracts, it exerts an upward thrust on the push rod. Due to the fixed upper end of the push rod, it exerts a downward thrust on the rubber tube and temperature sensor, causing the valve to open. At this time, the coolant passes through the radiator and thermostat valve, and then flows back to the engine through the water pump for a large circulation.

8. Radiator cover

The function of the radiator cap is to seal the water cooling system and regulate the working pressure of the system. When the engine is working, the temperature of the coolant gradually increases. Due to the expansion of the coolant volume, the pressure inside the cooling system increases. When the pressure exceeds the predetermined value, the pressure valve opens, and a portion of the coolant flows into the compensating water bucket through the overflow pipe to prevent the coolant from expanding and cracking the radiator. After the engine is shut down, the temperature of the coolant decreases, and the pressure in the cooling system also decreases. When the pressure drops below atmospheric pressure and a vacuum occurs, the vacuum valve opens, partially compensating for the coolant in the bucket flowing back to the radiator, which can prevent the radiator from being damaged by atmospheric pressure.

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