SU599848A1 - Aerator - Google Patents

Description

The robust impeller is asymmetrical, since the lower suction in the area is much larger. The configuration of a centrifugal impeller with rotating upper and lower discs is complex. It is difficult to make from wear-resistant materials.

The aim of the invention is to increase the aeration capacity of the aerator by increasing the area of the contact of the pulp and air in the cavity of the centrifugal impeller.

This is achieved due to the fact that the centrifugal impeller is equipped with an intermediate disk, around the perimeter of which blades are mounted, and relief disks are located above and below, forming air-flow channels with the intermediate disk.

FIG. 1 shows the proposed aerator, a longitudinal section; in fig. 2 - impeller, longitudinal section; in fig. 3 is a section along the line A-A in FIG. 2; in fig. 4 is a section along BB in FIG. one.

The aerator is a unit comprising a vertical shaft 1, on which a centrifugal impeller 2 and an axial impeller 3 are fixed, an aeration chamber 4, and a stator 5 with blades 6.

The pulp divider 7 is a cylinder that separates the streams of aerated pulp ejected by the centrifugal impeller from the re-entering through the suction inlet 8. The aeration chamber is fixed to the pipe 9 serving as the air intake duct for intake air. The centrifugal impeller has an intermediate disk 10, which is adjoined by symmetrically positioned relief disks 11 with grooves, at the junction points of which are upper and lower air ducts 12 and 13. Removable vanes 14 are fixed to the perimeter of the intermediate disk, fixed by known means, such as using a shank and wedge groove.

The embossed discs with grooves and the intermediate disc have centering protrusions 15 and circular grooves 16, which, when assembling the impeller, form air passageways. The relief discs have protrusions 17 arranged symmetrically, which are a continuation of the blades.

The described aerator works as follows.

The pulp to be processed is continuously sucked in by a centrifugal impeller 2 through the suction nozzle 8 and the pulp divider 7, falls on the blades 14 fixed in the grooves of the intermediate disc 10, which give it acceleration and are thrown into the aeration chamber 4.

The passageway of the pulp flows eject the air coming from the channels 12 and 13 formed by the relief disks 11 - with grooves and the intermediate disk 10. The projections 17 located on the relief disks 11 serve as continuation of the blades 14 and contribute to changing the direction of movement of the pulp flows at the entrance to the centrifugal impeller.

The pulp and air streams ejected from the centrifugal impeller 2 partially exit in the middle part of the flotation cell through the apertures of the aeration chamber 4, and some are sucked off by the axial impeller 3 and enter the lower part of the flotation cell, mixing the pulp into the aerator.

The proposed aerator makes it possible to increase the contact area of the liquid with air and, consequently, to increase the air throughput of the aerator and the dispersion of air bubbles, which greatly intensifies the flotation process.

Claims (2)

1. US Patent No. 3393803, cl. 209-169, publ. 1968. 2. USSR author's certificate №273096, cl. In 03D 1/16, 1967. f L) IS, / # .IG