Dual scraped surface heat exchanger
AssigneeChemetron Corporation
InventorsRobert L. Smith, Carl C. Yann
Life of this patent
Estimating the term…
Abstract
A heat exchanger for rapidly heating or cooling materials such as fluids containing fragile, discrete particles of varying sizes without substantial damage to the particles. The exchanger has inner and outer heat transfer surfaces that define an elongated annulus. Located in the annulus is a pair of opposed, spiral, inner and outer ribs which do not span the annulus and which, upon rotation, move the material toward the exchanger inlet against the flow therefrom which overflows the ribs and moves from rib to rib and to the outlet. Scraper blades associated with the ribs, scrape the exchanger inner and outer surfaces.
Claims10
A heat exchanger comprising:
- (a) a drum having an inlet and an outlet for material to be moved therethrough;
- (b) a first jacket for a heat exchange medium mounted on said drum and substantially surrounding the outside of said drum;
- (c) a pipe mounted within said drum and coaxial therewith;
- (d) a second jacket for a heat exchange medium mounted on said pipe and substantially extending around the inside of said pipe, said pipe and said drum defining an elongated annulus therebetween for the passage therethrough of the material;
- (e) means rotatably mounted in said annulus for moving the material toward said inlet against the material flow therefrom, said means comprising:
- (1) a pair of opposed spiral ribs, one rib being located adjacent said drum and extending toward said pipe and the other rib being located adjacent said pipe and extending toward said drum;
- (2) a plurality of pairs of scraper blades extending between said ribs for scraping said drum and said pipe;
- and
- (f) driving means to rotate said means and said ribs to move the material toward said inlet with a portion of the material flow from the inlet moving from rib to rib to the outlet.
Dependencies are inferred from the claim text.