SEAL-LESS MAGNETICALLY DRIVEN SCRAPED-SURFACE HEAT EXCHANGER

摘要

A seal-less magnetically drive scraped-surface heat exchanger (20) is provided that is particularly useful for aseptic processing. The heat exchanger comprises an elongated generally cylindrical heat transfer tube (22) having an inlet (112), an outlet (114), and a sidewall (110) defining a chamber between the inlet and the outlet. An elongated media tube (122) is provided in surrounding relation to the heat transfer tube. A rotary shaft (36) is mounted axially within the heat transfer tube. The rotary shaft has an outer surface and one or more scraper blades (44) extending from the outer surface of the rotary shaft. A drive end containment shroud (152) is mounted at an axial end of the heat transfer tube. The drive end containment shroud has a closed end (168), an open end (166), and a sidewall (170) defining a drive chamber in open communication with the interior chamber of the heat transfer tube through the open end of the containment shroud. An inner rotatable magnet assembly (154) is mounted within the drive chamber of the drive end containment shroud and connected to the rotary drive shaft. An outer rotatable magnet assembly (150) is mounted outside the drive end containment shroud and magnetically coupled to the inner rotatable magnet assembly. In use, rotation of the outer magnet assembly results in rotation of the inner magnet assembly, which results in rotation of the rotary drive shaft.