Patent ID: 9726407
Date: 2017-08-08
CPC Classifications: F25B

Claim:
1. An expansion valve, which is applied to a vapor compression refrigeration cycle, wherein the expansion valve depressurizes and expands a high pressure refrigerant, and the expansion valve outputs a low pressure refrigerant, which is depressurized and expanded by the expansion valve, toward a refrigerant inlet of an evaporator, the expansion valve comprising: a body portion that forms: a valve element that adjusts an opening degree of the throttle passage; an element portion that is placed outside of the body portion and includes a pressure-operated member, wherein the pressure-operated member is displaceable in response to a pressure difference between: a temperature sensitive rod that is placed such that at least a portion of the temperature sensitive rod is located in the low pressure refrigerant passage, wherein the temperature sensitive rod conducts displacement of the pressure-operated member to the valve element and conducts a temperature of the low pressure refrigerant, which flows through the low pressure refrigerant passage, to the temperature sensitive medium, wherein: the temperature sensitive rod includes a blind hole, which opens to the sealed space and extends in an inside of the temperature sensitive rod in an axial direction of the temperature sensitive rod, wherein the blind hole is configured to include an inner axial bar; the temperature sensitive medium is a mixture gas, which is a mixture of a refrigerant and an inert gas, wherein the inert gas is different from the refrigerant; and a mixing ratio of the inert gas in the temperature sensitive medium is set based on a ratio of an equivalent diameter of the blind hole, which is measured in a direction perpendicular to the axial direction of the temperature sensitive rod, relative to a depth of the blind hole, which is measured in the axial direction of the temperature sensitive rod, in such a manner that a time constant of heat conduction from the temperature sensitive rod to the temperature sensitive medium is kept within a predetermined time constant range.