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US 7,412,877 B1Granted
High pressure viscometer with chamber preventing sample contamination
AssigneeHongfeng BI
InventorHongfeng Bi
Life of this patent
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Abstract
Viscometer (80) with a rotor (51) rotatable by a coupling magnet (34) and a driving magnet (38) to shear a tested fluid thus imparting torque to a bob (30) mounted on a bob shaft (24) supported via a pair of bob shaft bearings. A spiral spring (70) restricts the rotation of bob shaft (24). Magnetometer (10) measures the angular position of a top magnet (72) connected to the top of bob shaft (24). This angular position information is further converted to the viscosity of the tested fluid.
Claims20
A pressurized device comprising:
- (a) a pressure vessel within which is vertically disposed at least one top section filled with a pressurization fluid of a first density and at least one lower section filled with a test sample of a second density,
- (b) an enlarged chamber with reduced openings positioned between the at least one top section and the at least one bottom section for communicating pressure with said top section and said lower section within said pressure vessel,
- (c) whereby said pressurization fluid would not mix with said test sample because of the nature of their density difference.
Viscometer comprising:
- (a) a pressure vessel within which at least one top section filled with a pressurization fluid of a first density,
- (b) within said pressure vessel a rotor which is driven to rotate while contacting with a sample liquid of a second density to be measured,
- (c) means for driving said rotor to rotate located in at least one bottom section,
- (d) a bob within said rotor,
- (e) an enlarged chamber with reduced openings positioned between the at least one top section and the at least one bottom section for communicating pressure located above said bob,
- (f) whereby said pressurization fluid would not mix with said sample liquid because of the nature of their density difference.
3 more elements
Dependencies are inferred from the claim text.