SU1656332A1 - Method of metering levels of several fluids and device thereof - Google Patents

Abstract

The invention relates to measurement techniques in the chemical and petroleum industries and can be used to measure the levels of several liquids or the level of refrigerant and oil in cold storage receivers. The aim of the invention is to improve accuracy and speed. The essence of the method is to create a constant magnetic field symmetric around the circumference. The introduction of ferromagnetic fluids into the vessel, the density of which is set by a constant magnetic field, and the level measurement is carried out by changing the magnetic resistance in the electromagnetic field circuit, which varies depending on the level of the ferromagnetic fluid. Prior to measurement, the ferromagnetic fluid is in the form of a film on the surface of the upper fluid. To displace it to a controlled level, control unit 5 supplies power to windings 6, which create a circumferentially symmetric electromagnetic field in core 7, acting on ferromagnetic fluid, increasing its density, lowering it into reservoir 2 to a controlled level. A change in the level of the liquid leads to a change in the position of the ferromagnetic liquid. The magnetic flux generated in the core 7 as a result of the flow of current in the winding 6 is closed through the ferromagnetic fluid, i.e. as the level decreases, the path of the magnetic flux increases, and consequently, the magnetic resistance of the core 8 increases. The voltage induced in the winding 10 is proportional to the magnetic resistance of the core 8, i.e. in proportion to the controlled level, at which the ferromagnetic film is located. 2 sec. f-ly, 3 ill. Z 7 with C Os ate o CJ GO Yu

Description

The invention relates to a measurement technique and can be used in the chemical and petroleum industry, in particular for measuring the levels of several liquids or the level of refrigerant and oil in receivers of refrigeration units.

The purpose of the invention is to improve the accuracy and speed of measurements.

Figure 1 shows the main reservoir; figure 2 - a reservoir of non-magnetic material; on fig.Z - tank, appearance.

A device for measuring the levels of several liquids, contains a reservoir 1 and a reservoir 2 connected to it, measured levels 3 liquids, layer 4 of ferromagnetic fluid, control unit 5, winding 6, magnetic cores 7 and 8, power winding 9, measuring winding 10 and permanent magnets 11.

During the use of tank 1, which can be pressurized or open, tank 2 is connected to it, respectively. The number of liquids, levels 3 of which are measured, is any. Moreover, a specific level of a given fluid can be measured with a specific weight of that fluid that differs from the specific weight of other liquids in the reservoir, and if there are several liquids with the same specific weights, the total level of these liquids is measured.

The device works as follows.

Prior to measurement, the ferromagnetic fluid is in the form of a film on the surface of the upper fluid. To displace it at a controlled level, control unit 5 supplies the appropriate power to the windings 6, which create a circumferentially symmetric electromagnetic field in the core 7 that acts on the ferromagnetic fluid, increasing its density, lowering it into the tank 2 at a controlled level. The windings 9 and 10 are wound on the upper part of the U-shaped magnetic core 8. A stabilized alternating voltage is applied to the winding 9.

A change in the level of the liquid leads to a change in the position of the film of the ferromagnetic liquid. The magnetic flux generated in the core 7 as a result of the flow of current in the winding 6 is closed through the film of ferromagnetic fluid,

those. as the level decreases, the path of the magnetic flux increases, and consequently, the magnetic resistance of the core 8 increases.

In addition, the magnetic core 8 is tapered downwards, which also increases its magnetic resistance when the ferromagnetic film is moved down. Thus, voltage induction-1

in the winding 10, proportional to the magnetic resistance of the core 8, on which the winding 10 is installed, i.e. proportional to the controlled level of the liquid on which the ferromagnetic film is located.

The magnetic field intensity gradient can be obtained approximately uniform in the plane of control due to the configuration of the core of the constant magnetic field and the reservoir (a gradient of the magnetic field of 5% is reached, which is within 5% of the density difference between the measured liquids)

Claims (2)

1. A method for measuring the levels of several liquids, including creating a magnetic field and changing the electromagnetic coupling of the primary circuit, which determines the level, that is, and in order to improve the accuracy and speed of measurements, the magnetic field create a circumferential constant, a ferromagnetic liquid is introduced into a container with measured liquids, its density is determined by a constant magnetic field corresponding to the density of the liquid, the level of which is measured, and the level is measured by changing electromagnetic coupling ferromagnetic fluid. 2. A device for measuring the levels of several liquids, containing a magnetic core with a winding wound around it, a container with a liquid, characterized in that, in order to improve the accuracy and speed of measurements, a U-shaped core with wound network and measuring windings is wound into it placed on the middle part of the U-shaped core above the upper surface of the container, ferromagnetic liquid, with the magnetic closed side surface of the container with several liquids, and the terminals of the U-shaped core tapering down the side of the container. Hl-l G V 70