SU1159398A1 - Non-contact meter of molten metal flow - Google Patents

Description

The invention relates to the field of instrumentation, and in particular to means of measuring the flow of liquid metals by the electromagnetic method. five

A device is known for measuring the flow rate of liquid metals, containing two sensors of conduction flow meters, spaced along the pipeline and recording natural hydrodynamic inhomogeneities of the flow, and a secondary device measuring the time of their „span between sensors.

A disadvantage of the known device, 5 is the presence of electrical contacts with the medium, which reduces the reliability and accuracy of measurement.

Also known is a contactless liquid metal flow meter, 20 containing Two flow sensors, each made in the form of a magnetic field source and an indicator coil, installed at a predetermined distance along the pipeline, and a time delay measurement circuit.

The plane of the turns of the indicator coils is oriented perpendicular to the magnetic field created by the sources of the magnetic field. thirty

The disadvantages of the known device are low sensitivity and accuracy of measurement, which is caused by the registration of natural hydrodynamic inhomogeneities, which are usually multidirectional and random in nature, as well as the fact that field fluctuations caused by flow turbulence occur only at the edges of the poles of the magnetic field. .

The aim of the invention is to increase the sensitivity and accuracy of measurement.

This goal is achieved by the fact that in the non-contact flow meter of liquid metals, containing two vortex sensors, each made as a magnetic field source and indicator coil, installed at a predetermined distance along the pipeline, and the time lag measurement circuit is oriented parallel to the magnetic the field created by the sources of the magnetic field, and in front of the sensors on the pipeline there is a generator of discrete unidirectional vortices, the axis of rotation

which coincides with the longitudinal axis of the pipeline.

Before the generator of discrete unidirectional vortices in the pipeline can be installed flow regulator.

FIG. 1 shows the proposed device, a general view; in fig. 2 and

3 - examples of the sensor.

The device contains a generator of discrete unidirectional vortices 1, which can be used as a non-contact inductive rotator of a discrete action flow, installed on the pipeline.

2 after stabilizer 3, sensors

4 and 5 for detecting ring vortices and a time interval meter 6 connected by conductors 7 to sensors 4 and 5.

The sensors contain magnetizing 8 and measuring 9 systems, the latter being equipped with indicator coils 10. The magnetizing systems can be made both in the form of permanent magnets and electromagnets, both with a constant and with a variable magnetic field.

Magnetic cores can be both independent and with a common yoke.

The device works as follows.

In a pre-stabilized flow of liquid metal using a non-contact induction flow rotator, discrete action creates unidirectional ring vortices. These vortices are carried by a stream of liquid metal along the pipeline, where sensors are installed at a fixed distance from each other and respond only to the tangential velocity component. .

When ^{- the} passage of the front of the vortex in a stationary magnetic field created by the magnets 8, in the liquid metal induced EMF, forming circulation currents. The magnetic field of these currents is closed through the measuring magnetic system 9, suggesting: in the measuring windings 10 pulse EMF. The passage of the rear edge of the vortex induces a reverse polarity pulse in these windings. The time between the appearance in the measuring windings of pulses of the same polarity is measured using a digital time interval meter.

1159398

In the case of an alternating magnetizing field, when a vortex passes in the region of a magnetizing system, alternating currents are induced in the liquid metal, which in turn induce a variable EMF in the measuring windings that exists in the windings during the magnetic field. In order to

To increase the sensitivity at high speeds, the output circuit of the sensors is equipped with ₅ differentiating links.

The use of the invention will increase the sensitivity and accuracy of measurement. In this case, the inertia of the flow meter decreases.

Claims (2)

1.BELESS CONTACT FLUID METER OF LIQUID METALS, contents: two vortex sensors, each made in the form of a magnetic field source and indicator coil, installed at a predetermined distance along the pipeline, and a time lag measurement circuit, characterized in that, in order to increase the sensitivity and accuracy of measurement The plane of the turns of the indicator coils is oriented parallel to the magnetic field created by the sources of the magnetic field, and a discrete one-way generator is placed in front of the sensors on the pipeline. PARTICULAR vortices whose axis of rotation coincides with the longitudinal axis of the conduit. 2. Measuring instrument for π.1, characterized in that in front of the generator of discrete unidirectional § vortexes in the pipeline installed to flow stabilizer. ¾ 1Τ59398 1 1159398 ²