DOUBLE PIPE HEAT EXCHANGER

摘要

PURPOSE: A double pipe heat exchanger is provided to fundamentally prevent an outer path of a bending unit from being blocked due to the deformation of an inner pipe because the deformation of the inner pipe is minimized in a bending process. CONSTITUTION: A double pipe heat exchanger comprises an inner pipe(10) and an outer pipe(20). A spiral groove(14) is formed on the outer surface of the inner pipe in a longitudinal direction to form an outer path(30) in a spiral shape. The pitches of the spiral groove are differently formed along the longitudinal direction of the inner pipe. The outer pipe and the inner pipe have a linear portion and a bent portion(40).