Imperforate bowl: centrifugal separators – With means for furnishing auxiliary fluid to material or... – Liquid
Patent
1990-04-03
1992-04-14
Hornsby, Harvey C.
Imperforate bowl: centrifugal separators
With means for furnishing auxiliary fluid to material or...
Liquid
494 42, 494 70, B04B 1506, B04B 108, B04B 1108
Patent
active
051043718
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention concerns a method and an equipment for cleaning internally of a centrifugal rotor, which has a central inlet chamber, a separation chamber connected via an inlet passage to the inlet chamber, and two central outlet chambers connected via an outlet passage each to the separation chamber at separate radial levels in it. While the rotor is rotating, cleaning liquid is supplied to the inlet chamber via an inlet channel in a stationary inlet device and is discharged from the two outlet chambers via outlet channels in a stationary outlet device.
A method for such an internal cleaning of a centrifugal rotor is described in JP U 60-104255. In this all cleaning liquid is supplied to the centrifugal rotor by means of a centrifugal pump arranged in an inlet conduit between a tank and the centrifugal rotor. Furthermore, all cleaning liquid, which is discharged via the outlet chambers of the centrifugal rotor is conducted back to the tank. However, it proves in practice difficult to obtain an acceptable cleaning result with the suggested method. Often one cannot get the radial innermost part of the centrifugal rotor clean enough. In many cases one therefore with equal time intervals has to disassemble the centrifugal rotor manually, clean it internally, including inserts present therein, and reassemble the same. This is a very time consuming operation. Especially this is the case in centrifugal rotors, in which a stack of conical discs is arranged in the separation chamber. If the separator is used for dewatering and cleaning of oils, this time consuming and also dirty operation often recurs. In some cases the cleaning has to take place every two hundred hours of operation.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a better method and a better equipment for cleaning internally of a centrifugal rotor, so that it does not have to be disassembled and cleaned manually. According to the invention this is achieved by conducting only a part of the cleaning liquid, which is discharged out of a centrifugal rotor of the kind initially described to a tank with cleaning liquid, out of which cleaning liquid by means of a pump is pumped into the inlet channel of a centrifugal rotor, whereas the rest of the discharged cleaning liquid is conducted directly to the inlet channel by means of an overpressure generated in the outlet device by the rotation of the rotor. Hereby a high flow of cleaning liquid into the rotor via the inlet channel can be achieved by means of a relatively small pump at the same time as a volume of cleaning liquid as large as needed for an acceptable cleaning result freely can be adapted to the case at hand.
The cleaning liquid present inside the rotor forms a liquid body rotating with the rotor, which in the outlet chambers extends radially inwards inside the greatest radius of the stationary outlet device arranged therein at which the outlet channels open. Upon stabilized flow conditions the radially inwardly directed free liquid surfaces of the liquid body in the different chambers of the rotor take a position at such radial levels that the total liquid flow out through the outlet channels becomes as large as the liquid flow in through the inlet channel. The higher flow that is achieved in the inlet channel the closer the free liquid surfaces to the rotational axis of the rotor thus will be. Since a large part of the cleaning liquid flowing out of the outlet channels according to the invention can be conducted directly to the inlet channel by means of the overpressure generated in the outlet device by the rotation of the rotor, a very high flow of cleaning liquid can be achieved in the inlet channel without the need of a separate pump having a correspondingly high capacity. Thus, during stabilized conditions it is possible thanks to the invention to have the free liquid surfaces of the rotating liquid body inside the rotor to take a position at radial levels, which are located at considerably smaller radius than the radius w
REFERENCES:
patent: 2628021 (1953-02-01), Staaff
patent: 2760889 (1956-08-01), Peltzer, Sr.
patent: 2788008 (1957-04-01), Wanzer
patent: 2905380 (1959-09-01), Matthews, II
patent: 3073516 (1963-01-01), Glasson
patent: 3752389 (1973-08-01), Nilsson
patent: 4759744 (1988-07-01), Krook
patent: 4820256 (1989-04-01), Nordstrom
Alfa-Laval Marine & Power Engineering AB
Hornsby Harvey C.
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