SU586369A1 - Measuring unit of rotary bell-type viscosimeter - Google Patents

Description

This invention relates to rotary devices for measuring the viscosity of liquids. Known viscometer, bell type, having replaceable inner cylinders, made with different geometrical dimensions of the radii. The known viscometer does not accurately determine the tangential stresses in the gaps. The closest technical solution is a viscometer in which the inner cylinder is mounted in the annular groove of the outer cylinder so that the dimensions of the working clearances between the lateral measuring surfaces are equal to -RB, Yang, -, (HI, RB -external and inner radii of the annular groove of the outer cylinder, RB,, RH, is the external and internal radii of the internal cylinder. However, even this device does not allow determining the tangential stresses with sufficient accuracy. The aim of the invention is to improve the accuracy of measuring tangential stresses in The goal is achieved due to the fact that the geometrical dimensions of the radii are made according to the ratio where Ksch, .RH ,, are the outer radii of the gaps; in,, RK, are the inner radii of the gaps. The drawing shows schematically the proposed measuring unit of the rotational viscometer. from the outer cylinder 1, represented by a Yush, it is a hollow block with an annular undercut 2, the lateral measuring surfaces 3 of which, I have radii on .., in,, are made of a porous material, an inner hollow bell-shaped cylinder 4 with a lateral and measuring surfaces, having the radii Rb, Rtt, Irn, the inner cylinder 4 is installed in the annular groove 2 of the outer cylinder 1 with mixing but dependency. On the outer cylinder 1 there are nozzles 5 and 6. The fitting 5 is connected to the pipeline for supplying a thermostatic liquid, having valve 7 and with a compressed air supply pipeline having a valve 8, a fitting 6 is connected to a pipeline for discharging a thermostatic liquid having a valve 9 and with a pipeline connected to a vacuum pump having a valve 10. When the annular valve is filled point 2

the outer cylinder 1 with the test medium closes the valves 7, 9, 8 and opens the valve 10. A vacuum is created inside the hollow block of the outer cylinder 1.

The inner cylinder 4 is installed in the annular groove 2 of the outer cylinder 1 € 0 by mixing according to

etc

 - -. The valve 10 is closed and

Biv

valves 7 and 9 are opened, the thermostatic fluid passes through the hollow block of the outer cylinder 1. The test fluid is heated to the required temperature and is produced by viscometer. To remove the test liquid from the annular recess 2, the inner cylinder 4 is removed from it, valves 7 and 9 are closed. The valve 8 is opened. Compressed air, entering the hollow block of the outer cylinder 1, passes through the porous side surfaces 3 of the annular recess 2, squeezes out of it test liquid.

The rotary viscometer of the bell type can be used for viscometry of both highly viscous and low viscous Newtonian and non-Newtonian fluids.

Claims (1)

Invention Formula A measuring unit of a bell-type rotational viscometer containing an external cylinder made in the form of a hollow block with an annular recess in which an internal bell-shaped cylinder is installed, characterized in that, in order to improve the accuracy of determining the tangential stresses in the gaps, the radius geometrical dimensions are as follows: R. R. R. , - external radii of gaps; . , -internal clearance radii.