SU979872A1 - Device for measuring ferromagnetic media level measurements - Google Patents

Description

The invention relates to a measurement technique and can be used in sinter production to measure the level of ferromagnetic matter in process tanks.

The devices for measuring the level of magnetic fluids in process capacitors are known, which are based on the principle of shunting a single-pole circular section of a magnetic conductor with a primary and secondary coils of ferromagnetic medium wound on it ..

In the absence of material in the tank, the magnetic flux is scattered along the length of the magnetic circuit and the induced emf in the secondary winding has the maximum value. With increasing damage, the magnetic flux of the exciter is partially closed through the measured medium, as part of the magnetic circuit becomes a shunted medium, and the EMF of the secondary winding decreases.

The disadvantages of this device are its low sensitivity, as well as the non-linear dependence of the EMF of the secondary winding on the position of the level.

Closest to the proposed technical entity is a device for measuring the level of ferromagnetic media, containing an open magnetic circuit of a y-shaped form, along which the primary and secondary windings are connected, respectively, to the excitation source and to the indicator. When appearing

10 of the material at the walls of the cover, the flow is closed through the magnetic material and the mutual inductance between the primary and secondary windings increases. The EMF of the secondary winding increases in proportion to the depth of the load;); sensor enters the measured medium 2.

A disadvantage of the known device is its low sensitivity and accuracy, due to the design of the magnetic circuit.

Tse. l invention - improving the sensitivity and accuracy of measurement.

The goal is achieved by

Claims (2)

25 that in the device containing a magnetic core with windings placed in a non-magnetic case, a source of excitation connected to the primary winding and an indicator, the magnetic circuit is made crosswise and is composed of four separate magnetic cores forming four pairs of poles facing the inner surface of the shaft, while Each individual magnetic conductor is symmetrically located relative to its axis, primary and secondary windings, connected according to in series with like windings on other magnetic circuits. The drawing shows the proposed device, the cross section. The device contains a protective non-magnetic case 1, a cross-shaped magnesium-conductor 2, which is a core of a linear transformer. open magnet conductor, primary single turn 3 and secondary 4 windings. In the case 1, made of a non-magnetic material, cr, the logo of the section, an elongated cross-shaped form 2, 5, made of soft iron and made of four different magnetic cores oriented along each other at an angle of 90 ° along the core 2, is placed The hollows of the opposite pole nakokhechnikov are located symmetrically with the OSYAM sectional coils with single-turn primary 3 and multi-turn secondary 4 windings. The device works as follows. When power is supplied from a stabilized source 5 to the primary winding 3 in the core 2, a magnetic flux F occurs, directed to an external ferromagnetic medium. The secondary to the winding is connected to the measuring device. The principle of the sensor operation is based on the shunting of the magnetic circuit with the primary and secondary windings of a ferromagnetic bulk material, which is an external ferromagnetic casing. When the device is immersed in the measured medium, the magnetic flux created by the coil passes through the magnetic material through the magnetic material, the mutual inductance between the primary and secondary windings increases and, accordingly, the EMF increases in the secondary winding measured by the measuring device. devices into the measured medium. The surface of the agglomeration medium in a continuous stream is significantly different from the surface of the liquid, which is essentially a plane. . The excess, / of some parts of the surface of the medium is relatively flat, reaching 25-32% of the nominal level. This device has four magnetocores, oriented at right angles to each other, therefore, the value of the medium level is averaged during the measurement itself in four directions. Thus, the implementation of the magnetic core in the form of a cross increases the accuracy of the measurement of the level of the flowing medium, providing averaging measurement results. In addition, the accuracy of the measurement in this case does not depend on the angle of the meeting of the axis of the magnetic circuit of the device and the axis of direction of movement of the medium. In addition, the depth of penetration of the magnetic field into the medium and the area covered by the magnetic umbrella increases. Due to the fact that all external magnetic poles are similar, there is a displacement of the ground field into the ferromagnetic medium due to the lateral spread of the magnetic lines, which leads to an increase in the magnetic flux density and, therefore, to the growth of the secondary EMF. The sensitivity of the device increases in proportion to the module of the magnetic flux. Thus, the accuracy of the invention is enhanced by creating a concentric magnetic field and increasing the amount of information, and sensitivity by increasing the umbrella penetration radius of the magnetic field into the medium being measured, as well as increasing the density of the magnetic field in the measurement zone. Apparatus of the Invention A device for measuring the level of ferromagnetic media, comprising a magnetic core with primary and secondary windings, placed in a non-magnetic cover, an excitation source connected to the primary winding, and an indicator connected to the secondary winding, characterized in that, in order to increase the sensitivity and accuracy of measurement , the magnetic circuit is made crosswise and is composed of four separate magnetic circuits, forming four pairs of poles facing the inner surface of the cover, with each section nom magnetic core symmetrically with respect to its axis has primary and secondary windings connected in series, in accordance with similar windings on magnetic cores other. Sources of information taken into account during the examination 1. USSR author's certificate No. 249674, cl. G 01 F 23/00, 1968. 2. USSR author's certificate number 322637, cl. G 01 F 23/06, 1969 (prototype). // V / - /