SU1636725A1 - Rotary viscometer - Google Patents

Abstract

This invention relates to a technique for the continuous measurement of viscosity. Its use in devices for regulating and controlling technological processes and for rheological studies allows to simplify and improve the accuracy of the viscometer. The rotational viscometer contains an asynchronous motor, on the axis of the rotor 1 of which the sensing element 2 (placed in the test liquid 3) and the disk 4 of the pulse sensor 5, the pulse former 6, the frequency comparison blocks 7.8, the stabilized excitation source 12 1, the meter 13 viscosities, a frequency divider 14 with a constant coefficient, a variable frequency divider 16, a rotation speed indicator 17, and a reference frequency generator 19. The goal is achieved through the introduction of a controlled power supply 9 of the control winding 10, a controlled pulse generator 15, a speed setting unit 18 and the execution of blocks 7.8 on a phase-pulse detector 20 and an integrator 21. 1 sludge. e (L

Description

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The invention relates to a technique for the continuous measurement of viscosity and is intended for use in devices for controlling technological processes according to the viscosity parameter, for operative continuous monitoring of viscosity in workshop or laboratory conditions, as well as for rheological studies of structured liquids.

The purpose of the invention is to simplify and improve the accuracy of the viscometer.

The drawing shows a block diagram of a viscometer.

The rotational viscometer contains an asynchronous motor, on the axis of the rotor 1 of which the sensing element 2 is immersed immersed in the liquid 3 and the disk 4 of the pulse sensor 5, the pulse former 6, the first and second frequency comparison blocks 7 and 8, controlled by the power supply 9 of the winding 10 motor control, stabilized power supply 11 of motor winding 12, viscosity meter 13, frequency divider 14 with a constant division factor, controlled pulse generator 15, variable frequency divider 16 ientom dividing pointer 17 rotation speed specifying unit 18 and the rotational speed of the reference frequency generator 19. Blocks 7 and 8 of the frequency comparison are made on a phase-pulse detector 20 and an integrator 21. A pulse sensor 5 can be implemented on two opto-electronic sensors. In this case, the driver 6 is a trigger. 19 quartz oscillator, possibly with a frequency divider at the output. The rotation speed setting unit 18 may include a button selector, a code decoder, and a memory element (counter). The meter 13 and the pointer 17 may be digital.

Rotational viscometer works as follows.

Before performing measurements by means of a button selector of block 18, a given rotation speed of the rotor 1 of the engine is set. In this case, the decoder of block 18 is entered with a binary-decimal code corresponding to the specified value of the rotor speed 1, and the numerical value is displayed on the digital pointer 17. At the same time, the code enters the divider 16 through the counter of the block 18, the corresponding division factor N is set. The signal from generator 15, controlled by the voltage of integrator 21 of block 8, is passed through divider 16, divided N times in it and compared to the frequency of generator 19 in detector 20 of block 8. Before entering detector 20 of block 7, the signal generator 15 is divided by divider 14.

Pass through the integrator 21, the signal from the detector 20 of the block 7 enters the control e0

My source 9 of the power supply winding 10 engine management. As a result, the control winding 10 begins to be energized and the rotor 1 rotates together with the toothed disk 4 and the cylinder 2 immersed in the liquid 3, which can be mounted on both sides of the rotor 1. When rotating the disk 4 changes the magnitude of the light flux in the two optoelectronic pairs of the sensor 5. The pulsed signals from the sensor 5 are fed to the driver 6 (trigger). The generated pulses are then fed to the first input of the detector.

20block 7. Due to the fact that this detector 20 receives signals from the sensor

bis divider 14, the pulse signals at its output will be transmitted to the integrator

21block 7 until the frequencies of these input signals become equal. Due to the signal from the integrator 21 blocks 7

® at source 9 in this case, a voltage will be obtained that will ensure rotation of the rotor 1 of the engine at a given speed. The magnitude of the voltage in the winding 10 of the control of an induction motor

5 is proportional to the moment of resistance (fluid viscosity) occurring on the sensing cylinder 2 immersed in the liquid. Measurement of this voltage, and hence viscosity, is carried out by viscosity meter 13 (digital 0 meter) and displayed on its display.

The use in the sensor 5 of the viscometer of two optoelectronic pairs ensures the elimination of the effect of the “rotor bounce of the engine 1 with the frequency of the supply network (50 Hz)

5 for the operation of the rotational speed control circuit of the rotor 1 of the engine, and the use of the frequency divider 14 by 200 times reduces the noise spectrum and thereby improves the accuracy of the control circuit.

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Claims (1)

Invention Formula A rotational viscometer containing an asynchronous motor, on the rotor axis of which is fixed a sensing element and a pulse sensor disk, the excitation winding of the asynchronous motor is connected to a stabilized power source, the output of the pulse sensor is connected through the pulse shaper to the first 0 by the input of the first frequency comparison unit, the second input of which is connected to the output of the frequency divider with a constant division factor, the reference frequency generator, the output of which is connected to the first input of the second frequency comparison unit, the divider 5 frequencies with a variable division factor and a viscosity meter, characterized in that, in order to improve the accuracy of the viscometer, a controlled power source, a controlled pulse generator, a rotation speed setting unit and a rotation speed indicator are inserted into it, and each frequency comparison unit is made on the series-connected phase-pulse detector and integrator, the first and second inputs of the phase-pulse detector of the first frequency comparison unit and the first input of the phase-pulse detector of the second frequency comparison unit in are inputs of respective blocks of the same name, the output of the integrator of the first frequency comparing unit is connected to the input of a controllable power supply, whose output is connected to the control winding induction motor and the viscosity meter input, the first and second outputs of the rotation speed setting unit are connected respectively to the inputs of the rotation speed indicator and the control inputs of a frequency divider with a variable division factor, the output of which is connected to the second input of the phase-pulse detector of the second frequency comparison unit, the integrator output of which connected to the input of a controlled pulse generator, the output of which is connected to the information inputs of frequency dividers with constant and variable division factors.