SU1413427A1 - Method of measuring flow rates of liquids and gases - Google Patents

Abstract

This invention relates to instrumentation engineering, is designed to measure flow in industrial pipelines and is aimed at improving accuracy. In the pipeline 1 is placed a symmetrical body 3 (ball), mounted on a ferromagnetic string. One end of the string is connected to the core 6 of the polarized relay 7, which acts as a vibrator. With the angular deviations of the symmetric body 3 around the string 2 with a constant frequency and in the presence of a stream flowing around this body, the Magnus force arises. This force changes the tension of string 2, the frequency of its natural oscillations, and can be fixed by a string force transducer 10. 1 il.

Description

oo

ji to "

This invention relates to instrumentation engineering and can be used to measure flow in industrial pipelines.

The aim of the invention is to improve the accuracy.

The method consists in the fact that during cyclic rotations of a symmetric body placed in a stream, when it flows around it, a magnus force arises, which creates an additional force on the string on which this body is fixed, the magnitude is proportional to the flow rate.

The drawing shows a device for carrying out the method.

In the tension pipe 1, a ferromagnetic string 2, on which in., In the center of the pipeline 1, is fixed a symmetrical body 3, for example a ball. One end of string 2 is rigidly fixed in glass 4 attached to the center of disk 5. Anchor 6 of a polarized relay 7 that acts as a vibrator is also connected to disk 5. The other end of the string passes through seal 8 of pipeline 1 and then between the poles of a permanent magnet 9 string converter 10 effort. The latter contains two springs P and 12, an auto-generator 13, which compiles a string converter 14, an error amplifier 15 and a flow indication circuit 16, made, for example, by an electromechanical one.

The device works as follows.

When the angular deviations of the symmetric body 3 with a constant frequency.

13427

caused by a polarized relay 7, the symmetric body 3, streamlined by the flow with speed, is affected by the force Mag-, nusa. It is proportional to the flow velocity, perpendicular to it and is determined by the formula

- | - frj coR -v,

five

0

five

0

five

0

where p is the flux density;

R is the radius of the symmetric body (ball);

The Magnus force stretches the string 2, the natural frequency of the string changes and is fixed by a string force transducer. The springs 11 and 12 are intended to linearize the output characteristics of the flow meter.

The electrical signal from the string converter 10 is compared with the signal of the compensating string converter 14 and, depending on the difference of the signals, the magnitude of the measured flow is indicated.

Claims (1)

Invention Formula A method for measuring the flow rate of liquids and gases, which consists in measuring the parameters of forced vibrations of a symmetric body located on a tube perpendicular to the flow of a liquid or gas, characterized in that, in order to increase accuracy, the forced vibrations of the body are created by cyclically turning it at an angle relative to t gi, and the value of consumption is judged by the magnitude of the effort per m