Imperforate bowl: centrifugal separators – Rotatable bowl
Patent
1982-08-30
1984-10-30
Jenkins, Robert W.
Imperforate bowl: centrifugal separators
Rotatable bowl
494 56, 494 64, 494901, B04B 110
Patent
active
044797893
DESCRIPTION:
BRIEF SUMMARY
The present invention is with respect to a bell-like centrifuge drum for continuously freeing metal turnings of oil as noted in the preamble of claim 1. Such a centrifuge drum has been put forward in the prior art, see German Pat. No. 1,226,793.
In the case of the known centrifuge drum the outlet openings for the liquid to be separated from the turnings are formed by the holes of a finely perforated, ring-like sheet metal sieve, which is placed at the inner face of the drum wall on the inner side of the gap between the two flanges, which are screwed together, of the two drum parts. For fixing the size of the gap, distance washers are placed between the flanges. The sheet metal sieve which is placed in openings of the same form on the inner side of the drum wall has the function of covering up the gap. This design of a centrifuge drum has not gone down well in the trade, because the ring-like sheet metal sieve has to have joins on the inner face of the drum wall which do not make it possible for smooth flow of the metal turnings to take place. While it is true that the sheet metal sieve may readily be changed over for a new one, the known centrifuge drum does have the shortcoming that the finely perforated sheet metal sieve quickly becomes stopped up and cleaning it is a generally complex operation.
A centrifuge for continuously freeing metal turnings of oil is produced by Machinenfabrik Gebr. Steimel having a bell-like centrifuge drum which is made in one piece and in the case of which the outlet openings for the liquid to be cleared from the turnings are formed by a number of lines of coned holes, which have their smallest diameter at the inner face of the centrifuge drum wall. In the case of this centrifuge drum as well cleaning with the more or less completely stopped up holes is a complex operation. For blowing material out of the holes, which may for example be placed in four planes, the known design of centrifuge has compressed air nozzles placed in the four planes so that the holes may be generally completely cleared by blowing. However, even with the coned design of the holes and the use of compressed air nozzles, the holes still become stopped up after the centrifuge have been used for some time because of oil materials and other sticky waste material, which becomes deposited and resin-like and makes its way into the holes. For this reason the holes have to be cleaned from time to time using a special pointed tool to get the waste material out. This work takes a long time. A further shortcoming of the known centrifuge drum is that there is heavy wear near the holes. Because of the abrasive effect of the metal turnings scratches and grooves are formed in the inner face of the centrifuge drum walls with the outcome that the turnings may not be smoothly taken from the drum and the centrifuging efficiency becomes less good.
One purpose of the present invention is that of designing a centrifuge drum for continuous centrifuges for turnings, which is free of the shortcomings, as noted, on the known centrifuge drum and is so designed that its oulet openings may be simply kept free, so that the liquid to be taken from the turnings may freely make its way out of the drum, furthermore the outlet openings may be cleaned while, furthermore, there is no wear of the drum at certain parts thereof.
This purpose is effected by using the structure as noted in claim 1.
The drum of the present invention gives the useful effect that for letting off the centrifuged liquid use is made of only one gap which may readily be cleaned by blowing into it with a compressed air nozzle and with the help of a scraper may readily be cleaned on moving round the drum. For this purpose use may be made of a normal sort of knife as for example a carpet knife. Because of the fact that the diameter of the lower edge at the inlet side of the gap is smaller than the diameter of the top edge at the inlet side of the gap, the metal turnings smoothly moving over the lower edge of the inlet of the gap are moved along a sort of chute, the metal t
REFERENCES:
patent: 336324 (1886-02-01), Johansson
patent: 1776554 (1930-09-01), Gale
patent: 3989184 (1976-11-01), Albishausen
patent: 4143806 (1979-03-01), Moriguchi
Jenkins Robert W.
Striker Michael J.
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