Mixer and method of mixing

B - Operations – Transporting – 01 – F

Patent

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Details

B01F 3/10 (2006.01) B01F 7/12 (2006.01) B01F 9/06 (2006.01) B01F 9/08 (2006.01)

Patent

CA 2613932

A dynamic mixer in which two members (1,2) are rotated relative to each other about a predetermined axis (XX), the members having facing surfaces (15, 16) which extend axially and between which is defined a mixing chamber through which a flow path extends between an inlet (7) for material to be mixed and an outlet (8). An array of two or more mixing formations is defined on at least one of the facing surfaces (15, 16) which extend radially towards the facing surface of the other element (15, 16) and which act to mix material within the mixing chamber, and which extend axially generally parallel to the axis. A mixing formation thus defined is configured to provide a constricting flow passage followed by an expanding flow passage to material present in the mixing chamber as the first and second members are relatively rotated, with the mixing formations located around the axis on any plane perpendicular to the axis so as to provide a generally net balance of the radial loads imparted by material present in the space between the surfaces. The material within the mixing chamber is subjected to high extensional and or shear stresses arising from the circumferential drag flow induced between the closely separated facing surfaces, while being permitted to flow axially between the widely separated flowing surfaces. Dispersive mixing and distributive mixing effects are thereby obtained.

L~invention concerne un mélangeur dynamique dans lequel deux éléments (1,2) tournent l~un par rapport à l~autre autour d~un axe prédéterminé (XX), les éléments ayant des surfaces opposées (15, 16) s~étendant axialement et entre lesquelles est définie une chambre de mélange à travers laquelle s~étend un circuit d~écoulement entre une entrée (7) du matériau à mélanger et une sortie (8). Une matrice de deux ou plus de deux formations de mélange est définie sur au moins l~une des surfaces opposées (15, 16) qui s~étendent radialement vers la surface opposée de l~autre élément (15, 16) et qui servent à mélanger le matériau à l~intérieur de la chambre de mélange, et qui s~étendent axialement et généralement en parallèle à l~axe. Une formation de mélange ainsi définie est configurée pour constituer un passage d~écoulement restrictif suivi d~un passage d~écoulement dilatateur pour le matériau présent dans la chambre de mélange tandis que le premier élément et le second élément tournent l~un par rapport à l~autre, avec les formations de mélange entourant l~axe sur un plan donné perpendiculaire à l~axe de manière à assurer un équilibre généralement net des charges radiales imprimées par le matériau présent dans l~espace situé entre les surfaces. Le matériau dans la chambre de mélange est exposé à des contraintes d~extension et/ou de cisaillement élevées, due à l~écoulement de traînée circonférentiel induit entre les surfaces opposées étroitement séparées, tout en pouvant s~écouler axialement entre les surfaces largement séparées. On obtient ainsi des effets de mélange dispersifs et des effets de mélange distributifs.

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