FI82892B - Rotor in a centrifugal sieve - Google Patents

Description

ι 82892

Keskipakoseulan rotor.- Rotor i en centrifugalsil.

The invention relates to a rotor of a centrifugal screen, in particular a screen for fine powders, having rotor blades spaced apart from the central axis of the rotor and in which pressurized gas, preferably air, is arranged to be supplied at several points from one or more rotor blades or in close proximity to the rotor blade.

Such a centrifugal screen is known from the Swedish publication Bulletin 420 ‘JÖO.

In a known centrifugal screen construction, a coil at the beginning of the rotor feeds the material to be screened to the screen and the rotor blades push the material through the screen mesh and the remaining overhang that has not passed through the screen protrudes out of the screen overhang. If there are deviations in the material flow to the screen in this construction, the excess tends to migrate to the overhang connection.

To overcome this drawback and increase the screening efficiency, the centrifugal screen rotor according to the invention is arranged in such a way that the at least one rotor blade is arranged to extend at the mouth of the material feed channel to be screened

The invention will now be described in more detail with reference to the accompanying drawing, in which: Figures 1 and 2 show a schematic side view of a rotor according to the invention in two mutually perpendicular planes.

2,82892

Figure 3 shows an end view of a rotor according to the invention seen from the outlet side of the material to be screened.

In the rotor shown in Figures 1 and 2, when mounted on a centrifugal screen not otherwise shown, the flow of material to be screened takes place from right to left in the figures. The plates 1 at the beginning (right end) of the rotor feed the material to be screened to the screen.

When the material comes from the feed tube to the screen, it immediately has two blades 5, 6 of the rotor, one of which has an air blow tube 7 with, for example, 0.5 min diameter holes at intervals of 20 mm oriented perpendicular to the surface of the screen net. The required air is supplied to the hollow shaft of the rotor at the end of the 8 shafts. The air entering the material reduces the friction between the material particles and the material becomes "liquid" and is better directed to the screen net due to the rotational movement. The second wing 3 of the two wings 2, 3 closer to the screen net also has an air blowing pipe 4 which pushes the material through the screen net and keeps it clean.

The following measurements have been obtained in the capacity measurements:

Material to be screened: potato starch sieve area 1 m2, sieve mesh size 0.5 mm 1. old construction: capacity 4 tn / h 2. new construction: capacity 20 tn / h

Claims (1)

Rotor of a centrifugal screen, in particular a screen for fine powders, having rotor blades (2, 3, 5, G) spaced apart from the central axis (8) of the rotor, and in which pressurized gas, preferably air, is arranged to be supplied from several points by one or more rotor blades or in the immediate vicinity of the rotor vane (3, 6) outwards with respect to the central axis (8) of the rotor, characterized in that at least one rotor vane (5, 6) is arranged to extend at the mouth of the feed channel of the material to be screened so as to exert a centrifugal effect on the material to be screened immediately upon entry of the material from the feed channel of the material to be screened. 4 82892 A centrifugal filter, specially designed for powder pulverized rotor, with rotor vines (2, 3, 5, 6) for measuring the ro-tower size (8), and for transport, heating air to the anthers of the rotor in the case of rotary rotors or in rotary rotors (3, 6), the rotating nozzles in the rotary gauge (8), the rotary gears, the minimum and the rotary rotation (5, 6) siktning avsedda mate-rialet pa sädant sätt, att den astadkommer en centrifugalkraft-efekt i det för siktning avsedda materialet omedelbart da det kommer ut ur matningsankalen för materialet som scall siktas.