EXPANSION VALVE FOR REFRIGERATING CYCLE

摘要

PROBLEM TO BE SOLVED: To provide a high pressure control valve of low costs capable of improving COP of a refrigerating cycle of CO2refrigerant incorporating an internal heat exchanger, enhancing cooling-down, and achieving strength of a temperature sensing portion in which the CO2refrigerant is sealed, equivalent to that of other high pressure components. SOLUTION: A high pressure control valve 3, 3A-3F is arranged in a refrigerant passage formed from the internal heat exchanger to an evaporator 4 in the refrigerating cycle of CO2refrigerant having the internal heat exchanger 8. The high pressure control valve 3, 3A-3F controls refrigerant pressure on an internal heat exchanger outlet side according to a temperature of the refrigerant at an outlet of a radiator. Into a temperature sensing section (air-tightly sealed space A), of which an inner pressure is changed according to the refrigerant temperature at the radiator outlet side, CO2refrigerant of charging density of 200 to 600 kg/m3, preferably 200 to 450 kg/m3, is charged. COPYRIGHT: (C)2007,JPO&INPIT