What is the use of a car thermostat
Automotive thermostats play a vital role in the automotive air conditioning system, the main functions include regulating the temperature inside the car, preventing the evaporator from forming frost and ensuring the normal operation of the air conditioning system . The thermostat controls the on-off state of the compressor by sensing the surface temperature of the evaporator, the internal temperature of the carriage and the external ambient temperature. When the temperature in the car rises to the preset point, the thermostat contact is closed and the compressor starts to work; When the temperature drops below the set value, the contact is disconnected and the compressor stops working, thus avoiding excessive cooling that causes the evaporator to freeze .
In addition, the thermostat has a safety setting, which is the absolute off position. Even when the compressor is not working, the blower can still keep running to ensure that the air in the car . These functions of the thermostat ensure a comfortable experience for the driver and passengers and protect the proper operation of the air conditioning system .
Automotive thermostat is a temperature sensing device, mainly used to control the temperature of the automobile air conditioning system and cooling system.
The role of automobile thermostat in air conditioning system
In a car air conditioning system, a thermostat is a switch that senses and controls the temperature. It determines the opening or closing of the compressor by detecting the temperature of the evaporator surface, thereby accurately regulating the temperature in the car and effectively preventing the evaporator from forming frost. When the temperature in the car reaches the preset value, the contact of the thermostat closes, activates the electromagnetic clutch, and the compressor starts to work; When the temperature drops below a certain set value, the contact is disconnected and the compressor stops working.
The role of automotive thermostats in cooling systems
In a car cooling system, the thermostat is the valve that controls the flow path of the coolant. It regulates the flow path of the coolant by sensing the temperature of the coolant, thus controlling the operating temperature of the engine. When the coolant temperature is lower than the specified value, the thermostat closes the coolant flow channel to the radiator, so that the coolant flows directly into the engine through the water pump for small circulation; When the temperature reaches the specified value, the thermostat opens and the coolant flows back to the engine through the radiator and thermostat for a large cycle.
Type and structure of thermostat
There are three main types of thermostats: bellows, bimetal sheets and thermistors. The bellows thermostat uses the temperature change to drive the bellows, and controls the start and stop of the compressor through the spring and contact; Bimetal thermostats control the circuit through the bending degree of the material at different temperatures; Thermistor thermostats use resistance values that vary with temperature to control the circuit.
Thermostat maintenance and fault diagnosis
The maintenance of the thermostat mainly includes regularly checking its working condition and cleaning its surface to ensure that it can sense temperature changes normally. Fault diagnosis can be performed by checking circuit connections, contact status, and the flexibility of the bellows or bimetal. If the thermostat fails, the air conditioning system may not work properly or the cooling system temperature is too high, and it needs to be replaced in time.
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