| 摘要 |
PROBLEM TO BE SOLVED: To provide an expansion device that is installed in piping in a refrigeration cycle for effectively preventing an abnormal increase in internal pressure by the differential pressure between the front and rear in a compact configuration. SOLUTION: The expansion device 1 is composed so that one portion of refrigerant pressure is canceled by a pressure cancellation structure. More specifically, elastic force required for a spring 18 is reduced by the level of pressure received by a pressure reception surface 27 for opening valves. As a result, a small-sized spring 18 can be adopted and the entire expander 1 can be composed compactly. When the differential pressure between the front and rear of the expansion device 1 reaches a preset value or higher, a refrigerant flowing in from the upstream side can be escaped to a channel separate from a refrigerant passage 24 in a valve element 20 by a release mechanism, thus preventing refrigerant pressure from increasing abnormally inside the expansion device 1 and preventing damage, or the like in internal equipment from occurring. COPYRIGHT: (C)2005,JPO&NCIPI
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