| 摘要 |
PURPOSE:To efficiently control the temperature in a refrigerator for a long time preservation of foods by providing a control part which drives an electric damper only for a fixed time in proportion to the difference between a temperature detected by a temperature sensor and a set temperature for the cold room to alter an opening angle of a damper plate. CONSTITUTION:A set temperature signal set by a temp. setting 41 of a control part 70 is read in by a microcomputer 71 via an A/D converter 72. Also, an output signal of a temp. sensor 42 is read in by the microcomputer 71 via the A/D converter 72. The microcomputer 71 compares the signals and does arithmetic operation. The microcomputer switches the polarity of a polarity change-over switch 75 to turn a DC motor 61 on and off for a given time. When the DC motor 61 is driven to turn a gear 63 in the arrow C direction, an arm plate 64 travel in the arrow D direction, and a damper 65 opens and closes a cold air inlet 13A of a cold air inflow duct 16. Thus, without a great change in cold air ventilation rate, a temperature in the cold room or freezer compartment can be controlled efficiently. |
