RU2455058C1 - Centrifugal mixer - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to continuous mixing of powder materials, and may be used in chemical, pharmaceutical and other industries. Centrifugal mixer comprises: vertical tapered case with discharge branch pipe arranged at its bottom, bearing assembly with shaft running therein, and cover with discharge branch pipe. Rotor is fitted on the shaft. Said rotor is made up of disk supporting hollow cones with deflectors and discharge vanes secured thereon. Deflectors are made up of separate identical-size elements of torus staggered on different cones along n edges of smaller bases.

EFFECT: higher efficiency with no additional power consumption.

2 dwg

Description

The invention relates to devices for the continuous preparation of mixtures of bulk materials and can be used in food, agricultural, chemical and other industries.

Known centrifugal mixer of powdered materials [1], containing a housing, loading and unloading device, a rotor, consisting of sequentially installed hollow truncated cones, the height and angle of inclination of which increases from the center of the rotor to the periphery. This is the main idea of this design. Particles of components under the action of centrifugal inertia begin to move from the center to the periphery along the surface of the cone. Since they have different masses, sizes, and friction coefficients on the surface of the cone, the speeds and trajectories of their motion are different, which, as a result, determines the mixing process. Particle trajectories also depend on the cone angle. Due to this, the mixer rotor consists of three different cones. After passing through all three cones in succession, the bulk mixture enters the bottom of the housing, where it is removed through the nozzle with discharge blades. SND of this design is characterized by insufficient intensity, since it does not provide for reverse recirculation of the mixture.

Also known is a centrifugal mixer of powdered materials [2], comprising a housing, a device for loading and unloading materials, a guiding funnel, a rotor consisting of three cones with windows, nozzles through which bulk materials enter, a reflector with windows that has a torus surface blades for unloading the mixture from the apparatus.

The technical drawback of this centrifugal mixer is the insufficiently intense force impact on the processed materials, which makes it difficult to obtain a high-quality final product in such a device. Centrifugal forces applied to the particles of material have unidirectional effects in these devices.

The technical task is to increase the smoothing ability of the mixer by organizing reverse recycling, increasing the intensity and efficiency of the process of mixing bulk materials, and, as a result, improving the quality of the mixture. To achieve this goal, reflectors are installed on the middle and outer cones in the form of individual torus elements of equal size and staggered on different cones relative to each other.

Figure 1 shows in section a General view of a centrifugal mixer continuous operation; figure 2 is an isometric view of the conical rotor.

The mixer consists of the following elements: a vertical cylindrical housing 1, the lower part of which ends with a hollow truncated cone with a smaller base at the bottom, a cover 2, on which there is a loading nozzle 3. In the lower part of the housing there is a discharge nozzle 4, a bearing assembly 5, in which the shaft is fixed 6. A rotor consisting of a disk 7 and hollow truncated cones of the inner, middle and outer 8, 9, 10 located with the bases downward is mounted on the shaft. Reflectors 11 are installed on the upper surface of the middle and outer cones 9 and 10 in the form of separate torus elements of the same size and staggered relative to each other on different cones along the edges of large bases with an inclination to smaller bases at an angle of 15-30 °. Also, unloading blades 12 are installed on the shaft.

The mixer is as follows. The initial components through the boot device 3 fall on the base of the inner cone 8, the height and angle of inclination of the generatrix of the cones increases from the center of the rotor to the periphery. Loose components under the action of centrifugal forces begin to move from the center of the base to the periphery and along the surface of the inner cone 8. Then they fall on the surface of the middle cone 9, on which there is a partial separation of the flow, the first part of which falls on the reflectors 11 of the middle cone 9, and is reset to its base, as a result of which there is a reverse recycling of bulk components and increases the storage capacity of the apparatus. The second part, under the action of centrifugal force, enters the outer cone 10, on which the flow is similarly divided into parts, one of which is discharged to the inner surface of the housing 1, the other, as a result of the installation of reflective elements, returns to the base of the cone 10 for further mixing. Due to the installation of these reflectors in a checkerboard pattern relative to each other on the middle and outer cones 9 and 10, partial recirculation occurs on each of them. The finished mixture falls into the lower part of the housing 1 and is removed from it by the blades 12 through the discharge pipe 4.

Due to the reflectors installed on the middle and outer cones, in the form of separate torus elements of the same size and staggered relative to each other on different cones along the edges of large bases with an inclination to smaller bases at an angle of 15-30 °, the smoothing ability increases increases the intensity and efficiency of the process of mixing bulk materials in the mixer.

Literature:

1. A.S. 997776 USSR, MKI B01F 7/26: B28C 5/16. Centrifugal mixer of powder materials. / A.S. Kurochkin, V.N.Ivanets, G.S. Sulein, A.A. Krokhalev (USSR). - Publ. in BI, 1983, No. 7.

2. A.S. RU 2200055 IPC C2 B01F 7/26. Centrifugal mixer. / V.N.Ivanets, S.A. Ratnikov, G.E.Ivanets, D.M. Borodulin, G.N.Belousov, 2000

Claims (1)

A centrifugal mixer comprising a housing, a device for loading and unloading materials, a guiding funnel, a rotor consisting of three cones, nozzles through which bulk materials fall, blades for unloading the mixture from the apparatus, characterized in that the inner surfaces of the middle and outer truncated cones are fixed reflectors in the form of separate elements of the torus, identical in size and staggered relative to each other on different cones along the edges of large bases with an inclination to smaller bases under angle of 15-30 °.

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