Working Principle and Common Faults of Yuchai Generator Set Engine Fan

The engines of Yuchai generator sets use three types of fans: steel plate fans, engineering plastic fans, and silicone oil clutch fans. The silicone oil clutch fan uses silicone oil to transmit friction. It utilizes the temperature change of the hot air flow from the radiator (water tank) to make the silicone oil clutch work and automatically adjust the fan speed. The specific separation operation is completed by the metal sensor on the silicone oil clutch. Diesel generator set manufacturers summarize the advantages of using a silicone oil clutch fan as follows: it ensures that the engine can automatically operate at the optimal temperature, reduces the power consumption of the fan, and is both energy - saving and noise - reducing.

Working Principle of the Silicone Oil Clutch Fan

When the engine starts or is at a low temperature, there is no silicone oil around the driving plate, and the drive shaft rotates idly. When the temperature rises, the metal sensor expands, causing the switch valve plate to turn an angle and open the oil outlet. The silicone oil fills the area around the driving plate. The friction of the silicone oil drives the driven disc, and then the fan is driven by the connecting bolts. The speed of the fan is controlled by the bimetallic sensor.

Common Faults of the Silicone Oil Clutch Fan

The automatic control malfunctions, mainly due to the malfunction of the metal sensor or silicone oil leakage. During use, pay attention to cleaning the oil and debris on the surface of the bimetallic sensor. The silicone oil clutch is adjusted at the factory and does not need to be disassembled and adjusted casually.

Simple Judgment of the Quality of the Silicone Oil Clutch

Start the engine at idle speed when it is cold. After a few minutes, stop the engine immediately. Try to turn the fan blades by hand. It should feel very easy because at this time, the silicone oil around the driving plate has been thrown back into the silicone oil chamber. After continuing to warm up the engine and then stopping it immediately, try to turn the fan blades again. It should feel very heavy because at this time, the engine temperature has risen, the valve plate has opened, and the silicone oil has entered the area around the driving plate. To turn the fan, you need to overcome the friction of the silicone oil, so it should feel heavy. Such a fan is in good condition.

The shape, structure, and installation of the engine fan of the Yuchai generator set have a great impact on the engine temperature. Therefore, the structure, shape, and size of the fan must meet the original design requirements of the machine. A deformed fan cannot be used anymore. A fan with poor dynamic balance will vibrate greatly during operation and have a poor cooling effect. When installing the radiator and the air guide cover, the rationality of their cooperation with the fan must be considered to improve the heat dissipation effect.

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