Patent ID: 6134900
Filing Date: 2000-10-24
Classification: B60H,F25B,Y02B

Abstract:
A supercritical refrigerating system comprising:a compressor for compressing refrigerant;a radiator for cooling the refrigerant discharged from the compressor, in which an inside pressure exceeds a critical pressure of the refrigerant;a pressure control valve for decompressing the refrigerant discharged from the radiator, the pressure valve including:a casing having a partition wall partitioning an inside of the casing into an upstream side space and a downstream side space, an inlet communicating with the upstream side space for receiving the refrigerant discharged from the radiator, and an outlet communicating with the downstream side space for discharging the refrigerant from the casing, the partition wall having a valve orifice through which the upstream side space and the downstream side space communicates with one another;a pressure responsive unit disposed in the upstream side space, defining a sealed space in which the refrigerant is sealed with a specific density, and including a pressure responsive member which moves in response to a pressure difference between an inside pressure of the sealed space and an inside pressure of the upstream side space; anda valve member connected to the pressure responsive member for adjusting an opening degree of the valve orifice in cooperation with the pressure responsive member; andan evaporator for evaporating the refrigerant decompressed by the pressure control valve,wherein a refrigerant passage in which the refrigerant flows from the radiator to the evaporator is closed by the pressure control valve when the compressor is stopped; andwherein, in the pressure control valve, the inlet and the outlet of the casing are disposed approximately in a line and the pressure responsive unit is disposed between the inlet and the outlet in the line so that the sealed space faces the inlet.