US2676707A

US2676707A - Centrifugal machine

Info

Publication number: US2676707A
Application number: US297923A
Authority: US
Inventors: Pieter Van Riel
Original assignee: Machinefabriek Reineveld NV
Current assignee: Machinefabriek Reineveld NV
Priority date: 1951-07-20
Filing date: 1952-07-09
Publication date: 1954-04-27
Anticipated expiration: 1971-04-27
Also published as: NL162760B; NL72873C

Description

Filed July 9, 1952 Plain lNvENToR 'Fl ETE-R VAN RIEL.

' AGENTS Patented Apr. 27, 1954 CENTRIFUGAL MACHINE Pieter van Riel, Delft, Netherlands, assignor to Machinefabriek Reinevcld N. V., Delft, Netherlands, a company Application July 9, 1952, Serial No. 297,923

Claims priority, application Netherlands July 20, 1951 3 Claims.

The invention relates to a centrifugal machine having a conical diverging perforated inner drum and a distributing drum located therein and adapted to rotate with an angular speed slightly differing from that of the inner drum and having blades or flights at its outer surface extending along substantially the whole length of the surface of the drum. Continuously operating centrifugal machines of this kind are used for dewatering granular materials, such as fine grained coal, crystallized substances and the like. mass on the narrow part of the perforated screen drum indeed rapidly loses its water, but on the larger diameter end of the drum the mass under treatment is practically not further dewatered. As, however, the frictional resistance of the gran-' ular material is materially increased due to the loss of water the particles of the material on the last part of the drum are crushed.

The invention has for its object to improve the treatment of the material in a centrifugal ma chine of the kind referred to and to this end additional blades are provided on the distributing drum at its large diameter end between the main blades, said additional blades extending along about half the axial length of the drum and said main blades having a passage opposite the end of the additional blades. Through said passage The part of the mass moving along a main blade passes to the adjacent additional blade so that on the large diameter portion of the drum the mass is distributed over double the number of blades and consequently on a larger surface.

Thereby it .will be possible to supply a larger quantity of material to the centrifugal machine so that its capacity is increased without reducing the rate of dewatering of the material, whereas crushing of the material due to increased frictional resistance is prevented.

In the drawing Fig. 1 shows a diagrammatical sectional elevation of a centrifugal machine provided with a distributing drum according to the invention;

Fig.2 is a view of the curved surface of the distributing drum in developed condition.

The screen drum l is secured to a hollow shaft 2 enclosing the shaft 3 of the distributing drum 4. The motor 5 drives the distributing drum 4 through the intermediary of a toothed gear 6 and the screen drum I through the intermediary of a gear 1. r

The distributing drum! is provided with main blades 8 which have a passage 9 about in the middle of their length. At the large diameter end of the drum an additional blade 19 is ar-.. ranged between each pair of adjacent blades 8.

The passages 9 of adjacent main blades 8 are staggered with respect to'each other and the respective additional blades extend beyond the passage of the adjacent main blade so that the additional blades have different length. The passages 9 in the main blades have a fixed relationship with respect to the adjacent end of the additional blades I 0. The staggered arrangement of the passages 9 of the main blades 8 prevents the material under treatment on one of the main blades from reaching the adjacent main blade.

What I claim is:

'1. In a centrifugal machine comprising a conical screen drum and a distributing drum posi tioned to rotate inside said screen drum and having a number of main blades at its outer surface extending substantially along the whole axial length of the drum, the provision of additional blades between adjacent main blades at the large diameter end of the drum and extending along about half the axial length of the drum and each of said main blades having a passage therethrough facing the end of the adjacent additional blades remote from the large diameter end of the drum.

2. A centrifugal machine as claimed in claim 1, wherein the passages in adjacent main blades are staggered with respect to each other.

3. In a centrifugal machine comprising a conical screen drum and a distributing drum positioned to rotate inside said screen drum in spaced relationship therewith, a first, a second and a third series of blades mounted on the outside of said distributing drum to extend substantially across the space between said drums, the blades of said first series extending substantially axially of said distributing drum from the large diameter end thereof up to a first point substantially half way between the ends thereof, the blades of second series being each alined with a blade of said first series and extending froma second point slightly spaced from said first point up to the small diameter end of said distributing drum, and the blades of said third series alternating with the blades of said first series and extending from said large diameter end and across the space defined between said first and second points and terminating short of said small diameter end, thereby to provide a larger number of blades at said large diameter end than at said small diameter end.

References'Cited in the file Ofthis patent UNITED STATES PATENTS Number Name 7 Date 905,860 Ericsson Dec. 8,1908 1,235,193 Elmore July 31, 1917 2,249,306 Bailly July 15, 1941