SU1569555A1 - Apparatus for measuring consumption of conducting liquid - Google Patents

Abstract

The invention relates to a measurement technique and can be used in determining the flow rate of conductive liquids. The aim of the invention is to improve the accuracy of flow measurement. The measuring circuit of the device records the speed of movement of the source 2 of the magnetic field along the nozzle 1 at the time it coincides with the flow velocity. The device contains a generator of mechanical oscillations, the rotation drive of which through a rotary motion converter into reciprocating movement of the permanent magnet moves along the nozzle 1 with a variable speed. The inputs of the comparator 11, which forms the recording signal to the recorder, are included in the diagonal of the bridge of the measuring circuit. The information input of the recorder 10 receives data on the instantaneous speed of movement of the source 2 of the magnetic field. 1 il.

Description

The invention relates to instrumentation and is intended to measure the flow rate of electrically conductive liquid '' · ty.

The aim of the invention is to increase accuracy.

The drawing shows a functional diagram of a device for measuring the flow rate of conductive fluid.

The device contains a pipe 1 of non-conductive material, a constant magnetic field source 2 in the form of a permanent magnet, mounted with the possibility of free movement along the guide 3, on which a return spring 4 is fixed. The permanent magnet is kinematically connected through the pusher 5 to the generator of mechanical vibrations, consisting of, ( for example, from a synchronous electric motor 6, on the shaft of which a cam 7 is mounted, an angle is connected to the converter 8, a code whose output is 25 is connected through a converter 9 code is a code to and the information input of the recorder 10, the control input of which is connected to the output of the comparator 11, included in the diagonal of the bridge measuring circuit formed by variable resistors 12 and 13 and magnetoelectric converters 14 and 15,

The device operates as follows.

At a zero flow rate through the pipe 1 and a fixed permanent magnet 2, the bridge circuit is balanced using variable resistors 12 and 13, after which, with the drive 6 turned on, a flow measurement is performed. In this case, the permanent magnet 2. together with the magnetoelectric transducers 14 and 15 using the cam 7, the pusher 5 and the return spring 4 is driven into a reciprocating uniformly accelerated movement along the guide 3.

As long as the speed of the permanent magnet 2 remains below the speed of the controlled flux in the pipe 1, the signal at the output of one magnetoelectric transducer exceeds the signal at the output of another magnetoelectric transducer, due to distortion of the magnetic field at the edges of the pole pieces with relative movement of the fluid flow and the permanent magnet.

If the instantaneous speed of movement of the permanent magnet and the flow velocity in the pipe 1 are equal, the magnetic field has the same configuration as it had when balancing the bridge circuit. In this case, the signals at the outputs of the magnetoelectric converters 14 and 15 are compared and a short pulse is generated at the output of the comparator 11, with which £ information from the converter 8 angle code 8 through the converter 9 code code is transferred to the registrar 10.! .

Using a code converter, the code for the angle of rotation of the cam is associated with the instantaneous speed of movement of the permanent magnet, which is fixed in the recorder at the moment of equality of its fluid flow rate.

Thus, · using the proposed device, the flow rate is determined by the instantaneous speed of movement of the permanent magnet at the time of their equality, due to which independence of the flow determination from variation is achieved over a wide range of conductivity of the controlled medium.

Claims (1)

Claim A device for measuring the flow rate of an electrically conductive liquid, containing a source of constant magnetic field, between the pole tips of which there is a pipe made of non-conductive material, a measuring unit in the form of a bridge circuit, in the shoulders of which magnetoelectric converters are included, a recorder, characterized in that, in order to increase accuracy, it introduced a guideline for moving the source of a constant magnetic field, an angle-to-code converter, a code-to-code converter, a comparator, a mechanical generator oscillations with a rotation drive and a rotary motion converter into a reciprocating variable speed connected with a constant magnetic field source, moreover, the comparator inputs are included in the diagonal of the bridge circuit, and the output is connected to the recorder control input, and '1569555 is a rotation drive through a serial code and code - code is connected to information - connected converters by the angular input of the recorder.