1. Single temperature, single control system
has only one evaporator, and a thermostat controls the temperature in the box. Refrigerators of this system have only refrigerating compartments or freezer compartments.
2, dual temperature, single control system
This type of refrigerator has both a freezer compartment and a refrigerator compartment.
3, solenoid valve controlled multi-temperature system
The following is also a kind of direct-cooled refrigerators and refrigerators, which are often used in high-end intelligent refrigeration systems. middle. This refrigeration system adds a two-position three-way solenoid valve and uses three capillary tubes on the basis of the ordinary direct cooling refrigerating freezer refrigerator refrigeration system. The refrigerator controls the two-position three-way solenoid valve through the single-chip microcomputer or the two temperature controllers of the refrigerator and the freezer, so that the temperature of the refrigerator and the freezer can be set separately, so that the refrigerator is more practical and energy-saving.
When the refrigerator and freezer compartments have not reached the required low temperature, the two-position three-way solenoid valve is energized to connect port 3 and port 1, and port 3 and port 2 are disconnected from drying The refrigerant in the filter enters the solenoid valve through the capillary a,Then enter the refrigerator evaporator through the capillary b, then enter the freezer evaporator, and finally return to the compressor . At this time, the refrigerator and freezer are cooled at the same time.
When the refrigerator compartment reaches the required low temperature first, the two-position three-way solenoid valve is de-energized, so that port 3 and port 2 are connected, and port 3 and port 1 are disconnected, so that capillary a and c are connected, a, b When disconnected, all refrigerant enters the freezer compartment evaporator, but does not enter the refrigerator compartment evaporator. At this time, the freezer compartment is rapidly cooled, but the refrigerator compartment is not.
When the freezing chamber has reached the required low temperature, the control circuit stops the compressor. It can be seen that the two-position three-way solenoid valve has the function of changing the direction of refrigerant flow, so it is also called the reversing solenoid valve.
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