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AssigneeThe Lubrizol Corporation
InventorsFrederick P. Boyle, Gary Garvin, Klaus-Werner Damm, Daniel H. Heath, Herman F. George, Peter J. Moore, Dale Hicks, Terence E. Robinson
Estimating the term…
A viscometer for sensing or characterizing the stress required to shear a fluid at a given rate includes a pair of members coaxially mounted for relative rotation. Between the members is an annular gap defining a flow path for the fluid. The flow path is configured such that during differential rotation of the members, fluid is caused to flow through the annular gap that is a function of the differential rotation and the viscosity of the fluid. A sensor measures the torque or torque equivalent required to achieve such differential rotation between the members.
A viscometer for measuring or characterizing the stress required to shear a fluid at a given rate comprising a pair of members coaxially mounted for relative rotation, an annular gap between said members defining a flow path for the fluid, a driver for producing such differential rotation, and a sensor for measuring the torque or torque equivalent required to achieve such differential rotation between said members, said driver comprising a motor, and a magnetic drive coupling between said motor and one of said members, the other of said members being relatively fixed, said magnetic drive coupling comprising a driving magnet rotatably driven by said motor, and a driven magnet driven by said driving magnet, said other member comprising a cup fixedly mounted within a housing, said housing having a bore in coaxial alignment with an open end of said cup, and a hollow shaft rotatably mounted in said bore, said shaft extending into said cup, and said one member comprising a bob fixedly mounted on said shaft within said cup.
A viscometer for measuring or characterizing the stress required to shear a fluid at a given rate comprising a pair of members coaxially mounted for relative rotation, an annular gap between said members defining a flow path for the fluid, a driver for producing such differential rotation, and a sensor for measuring the torque or torque equivalent required to achieve such differential rotation between said members, one of said members comprising a cup, and the other of said members comprising a bob rotatably mounted within said cup, and said driver comprising an air motor, and a magnetic drive coupling between said motor and said bob, said magnetic drive coupling comprising a driving magnet rotatably driven by said air motor, and a driven magnet mounted in a recess in an inner end of said bob, said cup having an externally threaded closed end for threaded receipt in an internally threaded bore in one end of said motor housing, and said one end of said motor housing having external threads for threaded engagement in an opening in a diagnostics chamber with said cup extending into said chamber, and a rotor shaft on which said rotor is rotatably mounted within said motor housing, said rotor shaft having an inner end extending coaxially into said bore in said motor housing, said driving magnet being mounted on said inner end of said rotor shaft for rotation by said air motor.
Dependencies are inferred from the claim text.