Scraped-surface heat exchanger

A scraped-surface heat exchanger for treating a fluid material comprising a stator surrounding a rotor, said heat exchanger including means for rotating said rotor, the stator comprising a plurality of annular projections extending inwardly towards the axis of rotation of the rotor and dividing the space within the stator into a plurality of annular spaces which communicate with one another at locations radially inwardly of the tips of the projections, said projections having convexly rounded tips, the rotor carrying scraping means comprising, in each annular space between two adjacent projections, at least one scraper blade which scrapes the whole of one flank of one projection and the whole of the opposite flank of the other projection, whereby some of the material is scraped off the projections as the rotor rotates and is mixed in said annular spaces with the remainder of the material.

A scraped-surface heat exchanger for treating a fluid material comprising a stator surrounding a rotor, said heat exchanger including means for rotating said rotor, the stator comprising a plurality of annular projections extending inwardly towards the axis of rotation of the rotor and dividing the space within the stator into a plurality of annular spaces which communicate with one another at locations radially inwardly of the tips of the projections, the stator having concave rounding between the roots of adjacent projections, the rotor carrying scraping means comprising, in each annular space between two adjacent projections, at least one scraper blade which scrapes the whole of one flank of one projection and the whole of the opposite flank of the other projection, whereby some of the material is scraped off the projections as the rotor rotates and is mixed in said annular spaces with the remainder of the material.

A scraped-surface heat exchanger for treating a fluid material comprising a stator surrounding a rotor, said heat exchanger including means for rotating said rotor, the stator comprising a plurality of annular projections extending inwardly towards the axis of rotation of the rotor and dividing the space within the stator into a plurality of annular spaces which communicate with one another at locations radially inwardly of the tips of the projections, the rotor carrying scraping means comprising, in each annular space between two adjacent projections, at least one scraper blade which scrapes the whole of one flank of one projection, the whole of the opposite flank of the other projection, the part of the stator between the roots of the two adjacent projections and half of the tip of each of them, whereby some of the material is scraped off the projections as the rotor rotates and is mixed in said annular spaces with the remainder of the material.

A scraped-surface heat exchanger for treating a fluid material comprising a stator surrounding a rotor, said heat exchanger including means for rotating said rotor, the stator comprising a plurality of annular projections extending inwardly towards the axis of rotation of the rotor and dividing the space within the stator into a plurality of annular spaces which communicate with each other, the rotor carrying scraper means comprising, in each annular space between two adjacent projections, scraping means which scrape the whole of one flank of one projection, the whole of the opposite flank of the other projection, the part of the stator between the roots of the projections and half of the tip of each of the projections whereby some of the material is scraped off the projections as the rotor rotates and is mixed with the remainder of the material.

A scraped-surface heat exchanger for treating a fluid material comprising a stator surrounding a rotor, said heat exchanger including means for rotating said rotor, the stator comprising a plurality of annular projections extending inwardly towards the axis of rotation of the rotor and dividing the space within the stator into a plurality of annular spaces which communicate with one another at locations radially inwardly of the tips of the projections, radial plate-like parts on the rotor, portions of the radial plate-like parts defining slots therein, the radial plate-like parts being imperforate except for said slots, and scraping means mounted in said slots and comprising, in each annular space between two adjacent projections, at least one scraper blade which has a width when free from stress which is greater than the spacing between the flanks which it scrapes and is flexed so that is cross-section is arcuate and it scrapes the whole of one flank of one projection and the whole of the opposite flank of the other projections, whereby some of the material is scraped off the projections as the rotor rotates and is mixed in said annular spaces with the remainder of the material.