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US 7,073,372 B2Granted
Online rotating viscometer and associated measurement methods
AssigneeMLD Research
InventorHugues Lahaut
Life of this patent
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AssigneeMLD Research
InventorHugues Lahaut
Estimating the term…
Rotating type viscosimeter 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 viscosimeter 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 viscosimeter, 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.
Viscosimeter comprising a motor (2) for driving an assembly (3) in a rotary movement, said assembly (3) extending at least partially into a liquid to be tested (1) through an aperture (4) of a partition (5) for separating the liquid (1) from the motor (2), characterized in that the viscosimeter comprises means for creating a counter-pressure (p2) at a motor side (M) of the partition (5) for preventing the liquid (1) from escaping through the aperture (4), the level of the liquid (1) being—in operation—above the aperture (4).
Method for measuring the viscosity of a liquid to be tested (1), comprising the steps of:
Dependencies are inferred from the claim text.