SU552110A1 - Centrifuge for dewatering fine grained materials - Google Patents

Description

one

The invention relates to devices for dewatering fine-grained materials, in particular screw centrifuges, and can be used in the mining, chemical, food and other industries.

The known filtering centrifuge, in the rotor of which there is a multiple screw, consisting of five annular sections with curved elements fixed on their outer surfaces, forming a curve of a given shape for braking the fast-moving layer of dehydrated material.

The known centrifuge is closest to the proposed technical essence and the achieved result.

However, the screw of this centrifuge has a complex structure that does not allow an increase in the residence time of the material being processed in the rotor.

In order to increase the residence time of the material in the rotor in the proposed centrifuge, a multiple-feed auger is used, the curvilinear elements of which are installed with a gap between their end edges.

In this case, the curvilinear elements of the subsequent spirals close the gaps between the curvilinear elements of the previous

spirals and installed with the possibility of adjusting the angle of their rise.

FIG. 1 shows the proposed centrifuge, longitudinal section; in fig. 2 — screw design; in fig. 3 shows the fastening of curvilinear elements; in fig. 4 shows a section along A-A in FIG. 3

The fine-grain dewatering centrifuge consists of rotor 1,

a transporting screw 2 rotating inside the rotor with an angular speed different from the angular speed of the rotor by 1--2%; frame 3;

The screw 2 of the centrifuge includes a housing 7, on which there are helical spirals formed of individual elements 8 installed with a gap between their end edges. The elements of the subsequent spirals are arranged in such a way that they cover the gaps of the previous ones. In addition, the curvilinear elements 8 of the helical spirals are attached to the body of the screw 2 with the possibility of changing the angle of their rise depending on the properties of the material being dried. For this, the fastening of curvilinear elements is performed on a separate rack 9 with a locking FONT 10 (see Fig. 3 and 4).

The centrifuge works as follows.

Through the loading nozzle 11, the material to be dewatered is continuously supplied. Under the action of centrifugal forces, the solid phase is separated from the liquid. The solid phase is transported to the unloading by the screw 2 and enters the unloading chamber located under the frame 3. The filtered liquid is collected in the chamber of the protective casing 5, from where it is discharged into the drain.

Due to this construction of the conveyor auger, the residence time of the material in the rotor is increased, and the efficiency of material dewatering is improved.

Claims (3)

1. Centrifuge for dewatering fine-grained materials, comprising a casing. a conical filter rotor and a multiple screw, each screw of which is formed by a series of curvilinear elements, characterized in that, in order to increase the residence time of the material in the rotor, curvilinear elements are installed with a gap between their end edges. 2. A centrifuge according to claim 1, characterized in that the curvilinear elements of the subsequent spirals close the gaps between the curvilinear elements of the previous spirals. 3. A centrifuge according to claim 1, characterized in that the curvilinear elements of the helical spirals are installed with the possibility of adjusting the angle of their lift.