Patent ID: RE42908

Claim:
A vapor-compression-type refrigerating machine for moving heat from a portion on the low temperature side to a portion on the high temperature side, comprising: a compressor for sucking and compressing refrigerant; a radiator for radiating heat from the refrigerant of high pressure; an expansion valve for decompressing and expanding the refrigerant cooled by the radiator; an evaporator for evaporating the refrigerant decompressed by the expansion valve so that heat can be absorbed by the refrigerant; and an internal heat exchanger for exchanging heat between the refrigerant of high pressure before the decompression by the expansion valve and the refrigerant of low pressure to be sucked by the compressor, the expansion valve including: a thin film-like diaphragm forming an airtightly closed space into which a predetermined mass of gas is enclosed; a valve body for changing a degree of throttle opening being interlocked with a displacement of the diaphragm; a spring for giving an elastic force to the valve body in a direction so that a volume of the airtightly closed space can be reduced, from an opposite side of the diaphragm to the side of the diaphragm on which the airtightly closed space is located; and a load giving portion for giving an initial load to the spring, wherein pressure in the airtightly closed space changes according to the temperature of the refrigerant flowing out from the evaporator, pressure of the refrigerant flowing out from the evaporator acts on an opposite side of the diaphragm to the side of the diaphragm on which the airtightly closed space is located, and the load giving portion can not be moved with respect to the housing.