SU1569673A1 - Viscometer - Google Patents

Abstract

The invention relates to the field of measuring a non-electric quantity by an electrical method and can be applied to control the viscosity of non-magnetic liquids under non-stationary conditions. The purpose of the invention is to simplify the design and increase the accuracy of measurements. The viscometer contains a serial magnetoelectric measuring mechanism mechanically coupled to a rotating blade. The input of the measuring mechanism is connected to the output of the shaper, which is connected to the power supply unit through a switching device. In addition to the existing pin-limiter, a pin is installed on the instrument scale, which is short-circuited by a conductive element located on the pointer of the measuring mechanism when the latter is deflected to the extreme position. Electrically, the pins enter the shunt circuit of a pulse generator connected to a power source via a switching device. 2 Il.

Description

The invention relates to the field of measuring non-electrical quantities by electrical methods, in particular, devices with remote transmission of readings for measuring the viscosity of a non-magnetic and non-conducting liquid.

The purpose of the invention is to simplify the design, increasing the accuracy of measurements.

Figure 1 shows schematically a digital viscometer; FIG. 2 shows a movable element of a meter with adjustable windage.

The viscometer includes a housing 1, a scale 2 with a pin 3 and a magnetoelectric measuring mechanism 4 with an arrow pointer 5 "A blade 7 is placed in the aperture 6 of the housing 1, made in the form of a duralumin frame 8

with a curtain 9 consisting of two parts that can be displaced relative to each other0 The blade 7 is mechanically fixedly coupled to the movable part of the mechanism 4, the input of which is connected to the output of the pulse former 10 with pulses of adjustable duration and amplitude of pulses on the scale 2, next to the pin the limiter 3 is mounted an additional pin And, so that with the maximum deviation of the pointer 5, the indicated pins bridged the line with a gai element 12 fixed to the pointer. Electrically, pins 3 and 11 through the damping resistor R enter the generator shunt circuit of 13 rectangular pulses.

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Both generator 13 and driver 10 are connected to a power source.

The viscometer works as follows.

The test liquid is poured into the vessel and the viscometer is positioned so that part of the body 1 (Fig.) Is supported on the edges of this vessel, while the blade 7 is immersed in the liquid.

The On button is pressed and the switch 14 performs a synchronous start of the generator 14 of the rectangular pulses and the former 10, which in turn supplies a voltage pulse to the circuit of the measuring mechanism 4 with a predetermined parameter. Under the action of this pulse, the electromagnetic forces create a turning moment the movable part of the mechanism 4 with the pointer 5 in the circumferential direction. This rotation is counteracted by the braking torque created by the viscous friction of the blade 7 in the liquid under study. Thus, there is an unambiguous dependence of the time interval during which the pointer 5 reaches pins 3 and 11 on the viscosity of the controlled fluid. When the pointer reaches 5 pins 3 and 11, the conductive element 12 short circuits the air gap between them, thereby shunting the feedback circuit of the generator 13 (the suppressor resistor R excludes short circuit for the power supply), and the generation of pulses at the output of the viscometer breaks and the viscosity value of the liquid under investigation turns out to be converted into a pack of standard pulses.

The characteristic of the transformation is largely determined by the following factor: the duration and amplitude of the pulses in the moving part of the measuring mechanism (the rotational moment changes).

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with the blade (windage) of the blade 7 (the braking torque changes) and the pulse frequency of the generator 13 "Therefore, in order to simply adapt the viscometer to the control of liquids with significantly different viscosity values, the controls with these parameters are displayed on the front control panel and around them calibration marks obtained by pre-calibration of control samples of various liquids. In addition, in order to change the sail area of the blade 7, the curtain 9 you-. complete of two parts, which, if necessary, can move relative to each other as shown in Fig.

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Claims (1)

Invention Formula A viscometer that includes an electrical measuring mechanism with a frame connected to a movable element immersed in the test fluid, a pointer indicator and a pointer limiter in the form of a conductive pin mounted on a scale, characterized in that, in order to simplify the design and improve measurement accuracy, the input of the measuring mechanism connected via a switching device to the output of the pulse shaper with an adjustable amplitude and duration, and on the scale next to the pin of the limiter It has a second conductive pin, while the pins have the ability to electrically interlock with each other a current-carrying element attached to the pointer pointer at the maximum pointer deflection and are connected to the source of the shunt pulse generator connected to the source through a switching device measuring mechanism power 0 Z 12 Editor A Shandor Compiled by V.Voschankin T Öhred M.Hodanich Order 1442 Circulation 488 VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab. 4/5 Production and Publishing Combine Patent, Uzhgorod, st. Gagarin, 101 at a Proofreader I. Muska Subscription