SU1388092A1 - Filtering centrifuge - Google Patents

Description

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The invention relates to devices for the separation of polydisperse suspensions under the action of centrifugal forces, concerns the construction of filter centrifuges and can be used in chemical, microbiological and other industries.

The purpose of the invention is to improve the quality of the separation of suspensions with the ag- regantly unstable solid fraction due to its clearer separation.

FIG. Figure 1 shows schematically the proposed centrifuge, a longitudinal section 15; in fig. 2 - power supply, longitudinal section; in fig. 3 shows section A-A in FIG. 2

The centrifuge consists of a housing .1, a casing 2 with nozzles 3, 4, respectively, for draining the filtrate and dehydrated sludge, a cover 5. Inside the housing 1 in bearings 6 on the hub 7, the rotor filter drum 8 is fixed. In the hollow shaft 9 of the rotor is 25 rod 10 with a pusher 11 at the end and with a device that provides its reciprocating motion. On the casing 2 of the housing 1 there is a powered device, made in the form of the DZ of a hydrocyclone 12, containing a cylindrical housing 13 with a tangential inlet 14 and a drainage pipe 15. Coaxially with the cylindrical conical housing 13 of the hydrocyclone 12, an additional cylindonic housing 16 is installed, covering with a gap body 13 of the hydrocyclone. Behind the drain pipe 15 of the hydrocyclone 12 in the housing 17 an impeller JQ ep 18 is installed, and the drain pipe 15 of the hydrocyclone 12 covers the suction pipe 19 of the impeller 18 with a gap.

The housing 17 of the impeller 18 has a port 20 for draining the central train of the flowing stream of the clarified slurry. The impeller 18 is mounted on the shaft 21, driven in rotation by an electric motor (not shown). The suction pipe 1.9 of the impeller 18, in order to eliminate air leaks onto the working blades of the latter, is provided with an axial tube 22, which is closed at the top and provided with channels 23, communicated with a space between the main 13 and an additional 16 hydro-tilt housing 12.

The centrifuge operates as follows.

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With the rotating impeller 18, the initial suspension is supplied by gravity, which through the tangential inlet 14 of the hydrocyclone 12 enters the cavity of the rotating cylindrical housing 13 of the latter, where the suspension is divided into liquid and solid phases. The liquid phase through the suction pipe 19 enters the impeller 18 and further into the cavity of its housing 17, from where it is thrown through the nozzle 20. At the same time, due to the resulting power dilution, an intensive suction of the liquid from the cylindrical housing 13 of the hydrocyclone 12 and simultaneously suspension through the tangential inlet 14 with the formation in the cavity of the housing 13 powerful centrifugal floor. Under the action of centrifugal forces, a large solid fraction of the initial suspension is applied to the walls of the body 13 of the hydrocyclone 12 and, through the top of its conical part, is directed to dewatering the rotating perforated drum 8 of the rotor. The smallest and lightest fraction is displaced in the cavity of the cylindrical conical body 13 of a hydrocyclone 12 into a central upward flow and through the gap between the discharge pipe 15 of a hydrocyclone 12 and the suction pipe 19 of the impeller 18 is diverted into the space between the main and additional bodies 13 and 16 of the hydrocyclone 12, Then, through the conic part of the additional body 16, it is also directed to the dewatering of the perforated drum 8, but already through the layer formed by the coarse solid fraction. The dewatered sediment as it grows on the surface of the perforated drum 8 is pushed during the reciprocating movement of the rod 10 by the pusher 11 to discharge through the nozzle 4, the filtrate is discharged through the nozzle 3.

Thus, in the described centrifuge, the initial suspension enters the hydrocyclone due to the suction effect arising when the impeller rotates, thereby eliminating the crushing of the solid fraction or destruction under its aggregatively stable structure, as well as the clarity of separation of the suspension. When processing

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Claims (1)

FILTERING CENTRIFUGE containing a housing, a rotor, a device for removing sediment and a feeding device made in the form of a hydrocyclone, characterized in that, in order to improve the quality of separation of suspensions with aggregatively unstable solid fraction, it is equipped with an impeller with a suction pipe and an additional cylindrical conical housing, the latter covers with a gap the hydrocyclone body, and the drain pipe of the latter with a gap covers the suction pipe of the impeller.