Analysis of 5 reasons for over temperature of diesel engine

Article provenance：Hai Rui ZhonglianPopularity：Publication time：2020-03-24 08:51

The engine cooling system of diesel engine fire pump adopts double closed-loop heat exchanger. The system has the advantages of high cooling efficiency and little influence on the ambient temperature of pump house. The cooling water flow direction is controlled by the ball valve from the pump outlet pipe to the heat exchanger, so that the cooling water temperature of the body is between 85-95 ℃. If the water temperature is too high, the opening of the ball valve can be increased, the heat dissipation capacity of the heat exchanger can be increased, and the water temperature of the engine cooling water can be reduced. On the contrary, the opening of the ball valve can be closed to improve the water temperature of the engine cooling water.

For diesel engine fire pump set, such as automatic control fire pump set, a solenoid valve is added in parallel with the ball valve in the hot pipeline. In general, the solenoid valve is closed, and the cooling water can meet the engine cooling requirements through the gate valve. When the engine cooling water temperature exceeds 95 ° C, the solenoid valve will automatically open to increase the cooling water flow and reduce the engine cooling water temperature. After 20 seconds, the water temperature of the diesel engine still exceeds 95 ° C, the automatic control system will give an audible and visual alarm, and call the staff to the site to check the cause.

There are several reasons for the high temperature of diesel engine fire pump:

1: Diesel engine fire pump overload operation. Therefore, in the operation of fire pump, it is necessary to avoid the high-speed and overload operation of diesel engine.

2: The engine oil radiator of diesel engine fire pump is blocked by foreign matters, resulting in poor heat dissipation;

3: The position of oil temperature regulating switch of diesel engine fire pump is incorrect. In summer, the oil will not dissipate heat through the radiator;

4: The cylinder of the diesel engine fire pump leaks, and the high temperature gas enters the oil pan to heat the oil in the oil pan.

5: The cooling fan speed of the air cooler of the diesel engine fire pump is too low, which reduces the cooling intensity and increases the temperature of the diesel engine.

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