| 摘要 |
PURPOSE:To shorten a time in which a food is frozen and to suppress a power consumption by a method wherein when a delivery cold air temperature is low during quick-freezing operation, a fan motor is rotated at a high speed and meanwhile, when the delivery cold air temperature is high, control is made such that the fan motor is rotated at a low speed. CONSTITUTION:A delivery cold air temperature detecting means 21 is provided for detecting the temperature of delivery cold air to a freezing chamber composed of a cooling system, and a detected signal therefrom is inputted to a microcomputer 11 of a control part B. When an operation switch 3 is turned ON and a quick-freezing operation command is inputted to the microcomputer 11, the number of revolutions of a fan motor 6 for driving a blast fan is varied according to a delivery cold air temperature. Namely, when a delivery cold air temperature is sufficiently low, a relay contact 22 is closed and capacity of a capacitor for driving the fan motor 6 is increased, and the number of revolutions is increased. Meanwhile, when a freezing load is excessive and a delivery cold air temperature in the freezing chamber is increased, the relay contact 22 is opened and the circuit of a capacitor 16 is separated to decrease the number of revolutions of the fan motor 6. |
