SU457012A1 - Rotary electroviscometer - Google Patents

Description

one

This invention relates to devices for measuring the viscosity of Newtonian and non-Newtonian liquids.

Known viscometer with a sensitive element of the magnetoelectric system.

In a known viscometer, the inner cylinder is suspended from the frame of the sensing element, the angle of rotation of which is recorded by a photoelectric device consisting of a mirror, an illuminator, a photocell, and a recording indicator.

However, when working with a known viscometer, it is necessary to monitor the condition of the surface of the mirror and the photocell data in connection with its aging.

In order to maintain a constant photocell illumination, a stable power source for the illuminator is required. All this reduces the reliability of the device.

In order to improve the accuracy of viscosity determination, in the proposed electroviscometer in a fixed circular coil connected to a current source, two moving coils are mounted, fastened to each other at an angle of 90 °, one of which, lying on the same axis as a fixed one, is connected to the input of the amplifier, the output of which is connected to the second coil.

The drawing shows a schematic diagram of the proposed electroviscometer.

The rotary coil 1 is bonded to the inner cylinder 2 and an additional coil 3 connected to the input of amplifier 4 through a voltage source 5, the output of which is connected to the rotary coil 1, and the fixed coil 6 is connected to a stabilized AC source 7.

An output signal proportional to the measured viscosity is taken from the shunt 8 and fed to the recording device 9. The outer cylinder 10, filled with the medium under investigation,

driven by a synchronous motor 11, through a gearbox 12.

Electroviscometer works as follows.

The outer cylinder 10, filled with the test material, is driven into rotation at a predetermined speed. Due to the occurrence of a moment of resistance on the inner cylinder 2, the turning coil 1 and the additional coil 3 turn on

some angle in The voltage induced in the auxiliary coil 3 and proportional to the cosine of the angle 0 is compared with the reference voltage of the source 5; their difference is amplified and fed to the turning coil 1; due to the interaction of magnetic fields

of coils 1 and b, a rotational moment occurs; the balancing moment is resisted on cylinder 2.

Subject invention

A rotational electroviscometer containing a rotatable outer cylinder with the medium under investigation, an inner cylinder fixed to the frame of an electrical measuring device, a recording device and, as a sensing element, a fixed coil connected to an alternating current source, characterized in that viscosity, in a fixed coil there are two moving coils, bonded to each other at an angle of 90 °, one of which is located on the same axis with the fixed coil and through the source the reference voltage is connected to the input of the amplifier, the output of which is connected to the second coil.