The chilled water from the ice maker's storage tank is continuously circulated through a plate or grid evaporator using a water pump; After the compressor runs, it undergoes suction compression exhaust condensation (liquefaction) throttling and then vaporizes at a low temperature of -10 to -18 degrees Celsius in the evaporator. Frozen water continuously condenses into an ice layer on the surface of the evaporator at a lower temperature of 0 degrees Celsius. When the ice layer condenses to a certain thickness, and the evaporation temperature of the refrigerant reaches the set temperature of the temperature control, the defrosting solenoid valve is connected, and the heat pump is often used to defrost, and then the next cycle is achieved.