Expansion valve
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United States of America Patent
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Issued Date -
Sep 13, 2007
app pub date -
Feb 28, 2007
filing date -
Mar 7, 2006
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
To provide an expansion valve which is capable of preventing the temperature of refrigerant compressed by a compressor from becoming too high, when a refrigeration load on a refrigeration cycle using an internal heat exchanger is high. A thermostatic expansion valve is applied to a refrigeration cycle provided with an internal heat exchanger that performs heat exchange between high-temperature refrigerant flowing from a condenser to the expansion valve and low-temperature refrigerant flowing from an evaporator to a compressor via the expansion valve. The expansion valve comprises a bypass passage or for causing refrigerant in a high-pressure refrigerant inlet or a low-pressure refrigerant outlet to flow to the downstream side of a temperature-sensing section, such that moist refrigerant is mixed with refrigerant whose degree of superheat is controlled by the expansion valve. This lowers the temperature of refrigerant that is drawn into the compressor when refrigeration load is high is lowered, to thereby prevent the temperature of refrigerant compressed by the compressor from becoming too high.
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