Analyze common refrigerator control circuit diagrams and easily understand the working principle of refrigerators

Whether it's hot summer or cold winter, we can't do without the refrigerator in our daily home life. It can help us keep food fresh for a long time and allow us to eat delicious food. But many friends don’t understand the working principle. Today we will analyze common refrigerator circuit diagrams and popularize the working principle of refrigerators.

1. Single door direct cooling refrigerator hammer type control circuit

The basic composition of the circuit: The circuit of a direct-cooling refrigerator started by a hammer-type starting relay is shown in the figure. It consists of a compressor motor, a hammer-type starting relay, a dish-shaped overload protector, etc., and consists of a thermostat and a door. The lamp and door light switch form a temperature control and lighting circuit.

Single door direct cooling refrigerator hammer control circuit diagram

1. Starting capacitor 2. Hammer type starting relay 3. Refrigeration compressor motor 4. Butterfly overload protector 5. Temperature controller 6. Light switch 7. Power plug 8. In-box lighting

2. Single-door direct cooling refrigerator PTC control circuit

Single-door direct-cooling refrigerators have a simple structure. The cooling pipe of the evaporator is directly attached to the inside or back of the refrigerator and freezer compartments, thereby forming natural convection in the refrigerator compartment and gradually realizing overall cooling. , that is, direct cooling method. Gradually, overall refrigeration, that is, direct cooling, was realized. The failure rate is relatively low and it is relatively more energy-saving.

Single door direct cooling refrigerator PTC control circuit diagram

1. Butterfly overload protector 2. Temperature controller 3. Light switch 4. Power plug 5. In-box lighting 6. PTC component 7. Compressor motor 8. Embedded protection relay

3. Double-door direct cooling refrigerator control circuit

The basic composition of the circuit: a direct cooling refrigerator circuit started by a PTC starting relay. The circuit is composed of compressor motor, PTC starting relay, dish overload protector, thermostat and door light switch.

1. Butterfly overload protector 2. Temperature controller 3. Light switch 4. Power plug 5. In-box lighting 6. PTC component 7. Compressor motor 8. Embedded protection relay

4. Double-door intercooling refrigerator control circuit

As can be seen from the circuit diagram of the intercooling refrigerator, it relies on forced blowing by a fan to circulate cold air in the refrigerator to achieve the cooling effect. There is no frost in the freezer or refrigerator compartment of this type of refrigerator, so it is called a frost-free refrigerator. The temperature inside the box has good uniformity, and the temperature of the freezer and refrigerator compartments is adjusted by their respective thermostats.

Double door intercooling refrigerator control circuit diagram

1. Start relay 2. Start capacitor 3. Fan motor 4. Freezer fan motor switch 5. Lighting lamp 6. Temperature sensing damper thermostat shell heater 7. Thermostat 8. Defrost time relay 9. Bimetal Thermostat 10. Water tray heater 11. Defrost heater 12. Fan ring heater 13. Drain pipe heater 14. Defrost overheat protector 15. Refrigerator fan/light switch 16. Motor 17. butterfly overload protector

Finally, summarizing the circuit diagrams of the above three refrigerators, it can be seen that the refrigerator is a refrigeration equipment that can maintain a constant low temperature. When the refrigerator is working, it operates through the compressor, condenser, refrigerant, etc. to perform refrigeration. This will bring more convenience to our lives and ensure the freshness of food for a longer period of time.