SU971452A1 - Mixing apparatus - Google Patents

Description

(.5TH DEVICE FOR MIXING

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The invention relates to devices for intensive mixing of liquid systems in order to homogenize them, as well as to prepare suspensions, emulsions, colloidal solutions, and can be used in the chemical, paint and varnish, pharmaceutical, food and other industries.

Devices are known for transferring shivaniya in liquid media, containing a copus, process connections and an agitator in the form of helical blades mounted on shaft C.

An agitator with screw blades creates in the apparatus mainly axial circulation of the liquid. This leads to a lower intensity of mixing in the radial direction and, consequently, to the inefficient use of such devices for the preparation of emulsions, suspensions and colloidal solutions. -.

The use of such devices in the chemical-photographic industry for the introduction of additives, especially solutions of hydrophobic substances in non-aqueous solvents, and the emulsion does not provide a sufficiently high-quality product, since The device in question does not allow the distribution of the injected substance to be uniform throughout the entire volume. In the emulsion, due to inefficient mixing, local inhomogeneities may occur, for example, viscosity, the particle size distribution of the injected component, etc. And this leads to unsatisfactory quality of photographic layers.

Also known are devices comprising shaft-with blades, with adjacent blades intersecting at an acute angle of 2 ,. These devices have insufficient mixing intensity.

A mixer is known for preparing viscous C 3 solutions containing a housing, process nozzles and an agitator in the form of a continuous ribbon bent in the form of a spatial volumetric unit.

One of the characteristics of belt mixers is that they are used to mix highly viscous media, preferably in a laminar mode.

The use of ribbon mixers for mixing low-viscosity media, in particular for processes associated with the preparation of suspensions, emulsions of colloidal solutions, is economically disadvantageous due to the complexity of their design, the fit of the drive and the apparatus as a whole compared to high-speed mixing devices.

The purpose of the invention is to intensify the process of mixing non-viscous media.

The goal is achieved by the fact that the inner edge of the tape is placed on the shaft sleeve.

Making the helical blades in this way causes each blade of the agitator to be divided by two adjacent blades into two or more parts and each of these parts contributes to the formation of an additional flow directed to the sides of the agitator.

FIG. 1 shows a general view of the device in section; in fig. 2 and 3 mixers with four and five blades, respectively.

The device consists of a housing 1, technological connections 2 and 3 for loading and unloading the product, shaft k on the sleeve 5 of which are screwed blades 6, the edge of which forms in space a three-dimensional assembly, for example triple.

The device works as follows. When the shaft k is rotated with the blades 6 fixed on it in the direction indicated by the arrow, inside the case 1 a complex three-dimensional flow of the medium occurs. Stirrer blades

when the shaft rotates, at least two streams are created: the lower part, the axial circulation of the liquid, the upper part, the radial and ascending turbulent flows.

 The number of blades of the stirrer may be different (see Fig. 2 and 3). As the number of blades increases, the number of flows created by the mixer increases, the intensity of mixing increases.

The use of the proposed device in the chemical-photographic industry to prepare a photo emulsion for irrigation (input solutions of colored components, tanning agents, etc.) will allow to intensify the mixing process by 20-30%.

The proposed annual economic effect from the use of the proposed device at the Kazan Chemical Plant. V.V. Kuibyshev will be at least 30 thousand rubles.

invention formula

A device for mixing, comprising a housing with nozzles, a drive shaft, at the free end of which a sleeve is installed with a stirrer fixed on it, made in the form of a continuous tape, the outer and inner edges of which form volumetric knots that, in order to intensify the mixing process medium, the inner edge of the tape is placed on the shaft sleeve.

Sources of information taken into account in the examination

1. Kasatkin A.G. Basic processes and apparatuses of chemical technology. Chemistry, M., 1971, p. 269, fig. VI-9.

2.Patent of England No., cl. On 01 F 7/16, 1977.

3. USSR author's certificate number 671832, cl. On 01 F 7/18, 1977.

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Claims (1)

Claim A device for mixing, comprising a housing with nozzles, a drive, 30 shaft, on the free end of which there is a sleeve with a stirrer mounted on it, made in the form of a continuous tape, the outer and inner edges of which form volumetric nodes, 35 characterized in that, for the purpose intensification of the process of mixing inviscid media, the inner edge of the tape is placed on the shaft sleeve.