| 主权项 |
1. A decompression device that is used for a vapor compression refrigeration cycle and depressurizes a refrigerant, the decompression device comprising:
a body part including at least one refrigerant inlet through which the refrigerant flows into the body part, a refrigerant outlet through which the refrigerant flows out of the body part, a swirling space in which the refrigerant flowing from the refrigerant inlet swirls, and a refrigerant passage space that guides the refrigerant flowing out of the swirling space to the refrigerant outlet; and a valve body that varies a passage sectional area of the refrigerant passage space, wherein the refrigerant passage space includes a smallest passage area portion that is smallest in passage sectional area, a throttle space that is positioned on at least a part of an outer peripheral surface of the valve body and is a space in which the refrigerant flowing out of the swirling space is depressurized, and a downstream-side space that is positioned on a downstream side of the throttle space in a refrigerant flow direction, the valve body varies the passage sectional area of the smallest passage area portion, and the downstream-side space has a shape to make the pressure of the refrigerant uniform in the downstream-side space during the operation of the refrigeration cycle. |
