HEAT EXCHANGER

摘要

The invention relates to a heat exchanger comprising a first cylindrical tube (2) and a lead screw (3) which extends coaxially inside the first cylindrical tube (2); the inner surface of the first cylindrical tube (2) has guiding grooves (22), and a cleaning element (12) is secured to the lead screw (3) in such a way that a rotating movement of the lead screw (3) moves the cleaning element (12) in the axial direction along the guiding grooves (22).