| 摘要 |
<p>PURPOSE:To improve the cooling capacity at low speed and to suppress it at high speed by a method wherein a compressor, the compressive capacity of which is stepwise by variable, is employed so as to change-over the compressive capacity in response to the rotational frequency to produce necessary cooling capacity based upon the temperature of a refrigerant at the inlet of an evaporator. CONSTITUTION:The output voltage Vc of an amplifier circuit A containing an element Th to detect the inlet temperature of an evaporator is compared with the output voltage Vd of a frequency-voltage converter circuit B. When Vc<Vd, a transistor Tr is turned ON, resulting in energizing a solenoid S in order to drive a compressor with small capacity CC2. On the contrary, when Vc>Vd, this means that necessary cooling capacity can not obtain under the present rotational frequency and the capacity CC2 of the compressor, the transistor Tr is turned OFF, resulting in driving the compressor with large capacity CC1.</p> |
