The temperature control structure of a refrigerator is a key part to ensure its cooling efficiency, temperature stability and energy-saving operation, and it usually consists of multiple components working together. The following are the main temperature control structures and their functions inside the refrigerator:
1. Temperature controller (temperature controller
Mechanical temperature controller: It senses the temperature inside the evaporator or the box through a temperature sensing bulb (filled with refrigerant or gas), and triggers a mechanical switch based on pressure changes to control the start and stop of the compressor.
Electronic temperature controller: It uses a thermistor (temperature sensor) to detect temperature and precisely regulates the refrigeration system through a microprocessor (MCU). It is commonly found in inverter refrigerators.
Function: Set the target temperature. Start cooling when the detected temperature is higher than the set value and stop when the temperature is reached.
2. Temperature sensor
Location: Distributed in key areas such as the refrigerator compartment, freezer, evaporator, condenser, etc.
Type: Mostly negative temperature coefficient (NTC) thermistors, with resistance values varying with temperature.
Function: Real-time monitoring of temperature in each area, feeding the data back to the control board to achieve zonal temperature control (such as multi-circulation systems).
3. Control mainboard (Electronic control module)
Function
Receive sensor signals, calculate and then adjust the operation of components such as the compressor and fan.
Supports intelligent functions (such as holiday mode, quick freeze).
In an inverter refrigerator, precise temperature control is achieved by adjusting the speed of the compressor.
4. Damper Controller (Special for air-cooled refrigerators)
Function: Regulate the cold air distribution between the refrigerator compartment and the freezer compartment, and control the opening and closing degree of the air door through a stepping motor.
Linkage: In coordination with temperature sensors, it ensures independent temperature control in each room.
5. Compressor and frequency conversion module
Fixed-frequency compressor: It is directly controlled by a temperature controller, and the temperature fluctuation is relatively large.
Variable frequency compressor: It can adjust the speed steplessly according to the temperature requirements, which is energy-saving and provides more stable temperature.
6. Evaporator and condenser
Evaporator: Absorbs the heat inside the box and cools down through the phase change of the refrigerant.
Condenser: Releases heat to the outside and is usually equipped with a temperature protection switch to prevent overheating.
7. Auxiliary temperature control component
Defrosting heater: Regularly melts the frost on the evaporator in air-cooled refrigerators, triggered by a timer or temperature sensor.
Fan: Forced circulation of cold air (air-cooled refrigerator), some models start and stop by temperature control.
Door switch: Detect the status of the door body, trigger energy-saving mode or turn off the fan.
8. Special functional structure
Multi-circulation system: High-end refrigerators adopt independent evaporators and refrigeration circuits to achieve independent temperature control for refrigeration, freezing and variable temperature chambers.
Vacuum insulation layer: Reduces the influence of external heat and maintains a stable internal temperature.
Post time: Jul-02-2025