The high tension control valve null compressor and the radiator and the evaporator

摘要

PROBLEM TO BE SOLVED: To avoid hunting phenomenon under low load, related to a high pressure control valve for a supercritical vapor compression refrigerating cycle system.;SOLUTION: A coolant of carbon dioxide and the like sequentially circulates a compressor, a radiator, and an evaporator for the supercritical vapor compression refrigerating cycle system operated in a supercritical area. A high pressure control valve is provided which is provided midway of a coolant path running from the radiator to the evaporator, and senses the pressure and temperature of the coolant on an outlet side of the radiator to control communication degree of the coolant path between the radiator and the evaporator, for controlling pressure on the outlet side of the radiator. A valve body 28 is provided which senses the pressure and temperature of the coolant on the outlet side of the radiator to move away from a valve port 15, and cooperates with the valve port 15 to control the communication degree of the coolant path between the radiator and the evaporator. The valve body 28, at maximum valve close position, does not entirely close while at a position slightly away from the valve port 15, assuring a trace amount of coolant flow.;COPYRIGHT: (C)2001,JPO