SU1629081A1 - Magnetic mixer - Google Patents

Abstract

The invention relates to chemical engineering, in particular to magnetic mixers. The purpose of the invention is to enhance the functionality of the mixer by adjusting the intensity of mixing, depending on the temperature of the solution. The mixer consists of a housing 1 and an electric motor 2, on the shaft 3 of which a magnet 4 is placed, interacting with a stirrer 7, the core of which is made of Ni-Fe-Cr alloy with a Curie point equal to 80 ° C. With stirring in the reaction vessel 6 of a mixture of solutions forming an exothermic reaction, the stirrer 7 is heated, the rod 9 loses its magnetic permeability, the stirrer 7 stops and the rate of the exothermic reaction slows down. 1 il.

Description

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FIELD OF THE INVENTION The invention relates to chemical engineering, in particular to magnetic mixers.

The purpose of the invention is to enhance the functionality by providing control of the intensity of mixing depending on the temperature of the medium being mixed.

The drawing schematically shows a magnetic mixer, a general view in section.

The magnetic mixer includes a housing 1, an electric motor 2, on the shaft 3 of which a magnet 4 is fixed. On the table 5 of the housing 1 there is a reaction vessel 6 inside which the stirrer 7 is placed, made in the form of a rod 9 made of a thermomagnetic material, 8 Ni-Fe-Cr alloy, - with a Curie point of 80 ° C.

The mixer works as follows.

A reaction vessel 6, filled with appropriate solutions for carrying out the reaction, in which the stirrer 7 has been previously lowered, is placed on the table 5. As a stirred medium, for example, an aqueous solution of sulfuric acid can be obtained by adding concentrated sulfuric acid to water. To ensure mixing, the motor 2 is turned on, the shaft 3 of which begins to rotate and, due to the magnetic coupling between the magnet 4 and the stirrer 7, rotates the latter. During the mixing process, the flow of the exothermic reaction is accelerated and the temperature of the solution in the reaction vessel rises. When the temperature reaches 80 ° C, the rod 9 loses its magnetic permeability and the stirrer 7 stops. By cooling the solution and the mixer 7 below 80 ° C, the mixer 7 again

enters a magnetic connection with a rotating magnet 4 and begins to rotate and stir the solution in the reaction vessel 6. Due to this, the intensity of mixing is automatically controlled depending on the temperature, which prevents an increase in the temperature of the solution in the reaction vessel 6 above the target (emergency), as well as boiling of the solution and its splashing over the edges

containers 6.

The use of the invention extends the functionality of the magnetic mixer by controlling the mixing as a function of temperature,

improves the working conditions of laboratory technicians and increases their safety in work.

Claims (1)

Claims of Magnetic Mixer Containing a housing with an electric motor installed in it, on the shaft of which a magnet is fixed, which interacts with an agitator made in the form of a rod made of magnetic material sealed in polyethylene and placed in a reaction vessel mounted on the housing, characterized in that provide intensity control mixing, depending on the temperature of the reaction medium, the rod is made of a thermomagnetic material.