The diesel generator set is mainly composed of a diesel engine, a synchronous alternator, a water tank, an integrated control panel, supporting electrical control equipment and various auxiliary components. The thermostat is the core component of the cooling system of the diesel engine cooling system. Its function is to According to the size of the diesel generator load and the water temperature, the amount of water flowing through the radiator of the water tank is automatically changed to ensure that the diesel generator works at the best temperature. Thermostat failure is also one of the common faults of diesel generator sets. If the thermostat is damaged, it will affect the operation of the diesel generator set.
The thermostat plays such an important role in the diesel generator set, so what is the working principle of the thermostat of the 300KW diesel generator set? We understand by analyzing the 135 series diesel engine using 154 type wax thermostat:
The working principle of 300KW diesel generator set thermostat. When the diesel generator set starts to work, the temperature of the coolant passing through the thermostat is lower than its starting temperature, the water outlet valve of the thermostat is closed, and all the coolant of the diesel generator set is returned to the fresh water pump through the bypass outlet of the thermostat. The inlet of the thermostat is used for recirculation, which can quickly increase the water temperature of the diesel generator set. When the cold temperature through the thermostat reaches about 76 °C, the water outlet valve of the thermostat starts to open. At this time, part of the cooling liquid of the diesel generator set It flows to the radiator through the water outlet valve, and the rest still flows back to the inlet of the fresh water pump through the bypass water outlet. When the temperature of the coolant passing through the thermostat reaches about 86°C, the water outlet valve of the thermostat is fully opened, and the water outlet is bypassed. Completely closed, all the coolant of the diesel generator set flows to the water radiator through the water outlet valve. There is a small hole on the water outlet valve of the thermostat. When the water outlet valve is closed, the air in the system is discharged through this hole.
When it is necessary to check whether the thermostat works normally, put the thermostat in the water and slowly heat it up, and observe the temperature when the water outlet valve of the thermostat is opened and fully opened, and the fully opened lift (8mm). within the specified range.
Diesel generator set 135 series diesel engines use two thermostats in parallel, which can increase the channel section of the thermostat and reduce the resistance. During use, the user cannot cancel the thermostat at will. When the thermostat is found to be out of order, it should be replaced with a new one. Otherwise, the temperature of the coolant will be out of control and the normal operation of the diesel generator set will be affected.
Post time: Jul-20-2022