Heat exchanger and double-pipe type refrigerating machine using this heat exchanger.

摘要

A heat exchanger of the double pipe for exchanging heat between a refrigerant flowing through an outer passage (3) and a refrigerant flowing through an inner passage (2), comprising: a restriction passage (6 ), communicating between the inner passage (2) and the outer passage (3), through which a refrigerant introduced into the outer passage (3) is introduced into the inner passage (2) while expanding.