Expansion valve, heat pump type refrigeration cycle apparatus, and air handling unit
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United States of America Patent
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Dec 21, 2010
Issued Date -
N/A
app pub date -
May 29, 2008
filing date -
May 29, 2008
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A first expansion valve may be provided in an outdoor unit, and a second expansion valve may be provided in an indoor unit. A pipe line connects a first joint pipe of the first expansion valve and a second joint pipe of the second expansion valve. When a refrigerant flows in from the second joint pipe and flows out from the first joint pipe, the first and second expansion valves are in a full open state due to pressure of the refrigerant. When the refrigerant flows in from the first joint pipe and flows out from the second joint pipe, the first and second expansion valves are in semi-closed state (flow rate controlling state). In a cooling mode, the second expansion valve expands the refrigerant just before an indoor heat exchanger, and in a heating mode, the first expansion valve expands the refrigerant just before an outdoor heat exchanger. In both heating and cooling modes, a large amount of refrigerant may flow through the pipe line to reduce pressure loss.
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