Patent ID: 6675877
Filing Date: 2004-01-13
Classification: F28D,F28F

Abstract:
A scraped-surface heat exchanger comprising:an elongated generally cylindrical heat transfer tube having an inlet, an outlet, and a sidewall defining a chamber between the inlet and the outlet; an elongated media tube in surrounding relation to the heat transfer tube; a rotary shaft mounted axially within the heat transfer tube, the rotary shaft having an outer surface and one or more scraper blades extending from the outer surface of the rotary shaft; a drive head end containment shroud mounted at an axial end of the heat transfer tube, the drive head end containment shroud having a closed end, an open end, and a sidewall defining a drive head 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 mounted within the drive head chamber of the drive head end containment shroud and connected to the rotary shaft, wherein the inner rotatable magnet assembly comprises a generally cylindrical sidewall defining a chamber and having an outer surface spaced apart from the sidewall of the drive head end containment shroud; and an outer rotatable magnet assembly mounted outside the drive head end containment shroud and magnetically coupled to the inner rotatable magnet assembly; wherein, in use, rotation of the outer magnet assembly results in rotation of the inner magnet assembly, which results in rotation of the rotary shaft.