초록 ▼

A control device is disclosed for controlling the operation of a compressor in an air conditioning or refrigerating system. The compressor includes a variable displacement device which changes the capacity of the compressor and a magnetic clutch which operates the compressor in response to an extern

A control device is disclosed for controlling the operation of a compressor in an air conditioning or refrigerating system. The compressor includes a variable displacement device which changes the capacity of the compressor and a magnetic clutch which operates the compressor in response to an external drive mechanism. The control device controls the operation of both the variable displacement device and the magnetic clutch in response to the temperature of the cool air generated at the evaporation of the air conditioning or refrigerating system. Two temperature detectors having different thermal response characteristics detect the temperature of the cool air. The difference between the temperatures detected by these sensors is used by the control device to control the operation of the variable displacement device.

대표청구항 ▼

A control device for a refrigeration circuit including a compressor, a condenser, a thermostatic expansion device, an evaporator and a blower to blow cool air from said evaporator, said compressor having a magnetic clutch to drive said compressor and a variable displacement device to change the capa

A control device for a refrigeration circuit including a compressor, a condenser, a thermostatic expansion device, an evaporator and a blower to blow cool air from said evaporator, said compressor having a magnetic clutch to drive said compressor and a variable displacement device to change the capacity of said compressor, said control device comprising: a voltage source; magnetic clutch control means connected to said voltage source for actuating said magnetic clutch to drive said compressor in response to the temperature of the cool air generated by said evaporator, said magnetic clutch having first temperature detecting means for detecting the temperature of the cool air; capacity control means connected to said voltage source and said magnetic clutch control means for actuating said variable displacement device to change the capacity of said compressor in response to the temperature of the cool air generated by said evaporator, said capacity control means having a second temperature detecting means for detecting the temperature of the cool air, said second temperature detecting means having a different thermal response characteristic than said first temperature detecting means, said capacity control means evaluating the difference between the thermal responses of said first and second temperature detecting means to determine when to actuate said variable displacement device to change the capacity of said compressor.