| 摘要 |
[Problem] To provide a discharge capacity control system for a variable capacity compressor with which it is possible, using a simple configuration and without including a displacement means, to avoid operation at a high discharge capacity while there is a shortage of coolant. [Solution] A discharge capacity control system 400 for a variable capacity compressor, the discharge capacity control system 400 controlling the discharge capacity of a variable capacity compressor 100 in which a radiator, an expander, and an evaporator are interposed in a coolant circulation path for circulating a coolant to constitute the refrigeration cycle of an air-conditioner system, and in which the discharge capacity varies on the basis of variation in the pressure in a control pressure chamber 140, wherein the discharge capacity control system 400 is provided with: a control valve 300 having a pressure-sensing member 306 that becomes displaced in the opening/closing direction of a valve body 305 in response to a differential pressure between two points on the coolant circulation path in the variable capacity compressor, and an actuator 310 for applying an urging force in the valve-closing direction to the valve body 305 in accordance with a supplied control current, the valve body 305 being displaced in accordance with the differential pressure between the two points and the urging force from the actuator 310, and the control valve 300 adjusting the opening degree of a pressure supply channel 145, which communicates between a discharge chamber 142 and the control pressure chamber 140, and varying the pressure within the control pressure chamber 140; a pressure detection means 403 for detecting the pressure in the low-pressure region of the coolant circulation path; and a control current supply means 410 for setting a control current and supplying the control current to the actuator 310 so as to reduce the discharge capacity when the pressure in the low-pressure region of the coolant circulation path falls below a lower limit value set in advance. |
