Online rotating viscosimeter and associated measurement method

Details Online rotating viscosimeter and associated measurement method Online rotating viscosimeter and associated measurement method

G - Physics

01

N

G01N 11/14 (2006.01) G01N 3/00 (2006.01)

Patent

CA 2450095

Rotating type viscometer having a motor (2) for driving a rotating assembly (3) extending through an aperture (4) into a liquid to be tested (1) and measuring the shear forces imparted by said liquid (1) to the rotating assembly (3) . In order to prevent said liquid (1) from leaking through the aperture (4) due to a liquid pressure (p1) at the level of the aperture (4), the viscometer comprises means for creating a counter-pressure (p2) at the level of a gap between the rotating assembly (3) and the aperture (4). Thanks to this counter-pressure (p2), no solid sealing means are required, thereby improving the durability and the robustness of the viscometer, as well as simplifying it by eliminating countermeasures otherwise needed for taking into account parasitic friction forces exerted on the rotating assembly (3) due to such solid sealing means .

L'invention concerne un viscomètre rotatif équipé d'un moteur (2) qui commande un ensemble rotatif (3) passant par une ouverture (4) pour pénétrer dans un liquide (1) soumis à essai afin de mesurer les forces de cisaillement exercées par ce liquide (1) sur l'ensemble rotatif (3). Pour empêcher que le liquide (1) ne s'échappe par l'ouverture (4) du fait d'une pression du liquide (p1) au niveau de cette ouverture (4), le viscomètre comprend un moyen qui crée une contre-pression (p2) au niveau d'un vide situé entre l'ensemble rotatif (3) et l'ouverture (4). Grâce à cette contre-pression (p2), aucun dispositif d'étanchéité solide n'est nécessaire, ce qui améliore la durabilité et la robustesse du viscomètre, et le simplifie par l'élimination de contre-mesures autrement nécessaires pour prendre en compte les forces de frottement parasites exercées sur l'ensemble rotatif (3) lorsque de tels dispositifs d'étanchéité solides sont présents.

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