Liquid purification or separation – Tangential flow or centrifugal fluid action
Patent
1989-08-07
1990-10-30
Hart, Charles
Liquid purification or separation
Tangential flow or centrifugal fluid action
55398, 55448, B01D 2126, B01D 1920
Patent
active
049667033
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a cyclone separator.
Cyclone separators conventionally have inlets at the side thereof for the material to be separated whereby to introduce the material into the cyclone separator with a tangential component of motion. Cyclone separators constructed in accordance with this principle are described in U.S. Pat. No. 4,237,006, Australian patent application No. 84713/79 and International applications No. PCT/AU83/00028 and PCT/AU85/00010. These separators have particular application in the separation of less dense from more dense components in a liquid mixture, particularly in the separation of oil from oily water mixtures.
It is in many cases inconvenient to provide side inlets and it is an object of the invention to provide a construction which permits an axially positioned inlet.
In one aspect, the invention provides a cyclone separator for separating two liquid components one of greater density and the other of lesser density, one from the other, when admitted in admixture to a separating chamber of the separator, the separating chamber being of generally tapered form, tapering from a larger diameter end to a smaller diameter end, and being in the form of an axially extending surface of revolution, the separating chamber having an overflow outlet for the less dense component, located at the larger diameter end, and an underflow outlet at the smaller diameter end, for outflow of the greater density component, and inlet means for inlet of the mixture into the separating chamber at a location at least towards said larger diameter end with a tangential component of motion, characterized in that the inlet means is in the form of an axially extending inlet duct which opens into the separating chamber at said larger diameter end thereof, the inlet duct being provided with flow directing means for axially directing flow into the separating chamber with said tangential component of motion.
The flow directing means may be in the form of one or more baffles, such as helically extending baffles, or may be in the form of vanes or the like fixed to a member which is in use rotated about the axis of the separator to effect inlet of the mixture. In any event the inlet duct may extend in surrounding coaxial relationship with the overflow outlet. The duct may be of annular form of substantially constant outer diameter along its length but having an inner diameter which increases in the direction of inlet flow to the separating chamber. It may also be of helical form.
The invention is further described by way of example only with reference to the accompanying drawings in which:
FIG. 1 is a partly sectioned perspective view of a cyclone separator constructed in accordance with the invention;
FIG. 2 is a cross-section substantially on the line 2--2 in FIG. 1;
FIG. 3 is an axial cross-section of an inlet duct forming part of the cyclone separator of FIG. 1;
FIGS. 4, 5 and 6 are, respectively, diagrams showing alternative forms of cyclone separator constructed in accordance with the invention;
FIG. 7 is a cross-section approximately on the line 7--7 in FIG. 5; and
FIG. 8 is a fragmentary sectional perspective view of the inlet to the cyclone separator of FIG. 5.
Referring firstly to FIGS. 1 to 3, the cyclone separator shown therein has a separating chamber 25 which has its surface defined as an axially extending surface of revolution in turn defined by the inner surface of an outer casing 37 The separating chamber is of generally tapered form, tapering from a larger diameter end 10a to a smaller diameter end 10b. In this instance, the separating chamber 25 is shown as being formed in accordance with the teachings of the aforementioned U.S. Pat. No. 4,237,006, Australian patent application No. 84713/79 or International application No. PCT/AU83/00028. More particularly, the separating chamber 25 has a first portion 12 of diameter d.sub.1 and length l.sub.1 this being of generally constant diameter throughout its length, a tapered portion 12a of frusto-conical configuration which tapers from diameter d.su
REFERENCES:
patent: 2413324 (1946-12-01), Holzwarth
patent: 2754970 (1956-07-01), Ross
patent: 3407575 (1968-10-01), Krizmann
patent: 3543485 (1970-12-01), Hardison
patent: 4163719 (1979-08-01), Macierewicz et al.
patent: 4259180 (1981-03-01), Surakka et al.
patent: 4832709 (1989-05-01), Nagyszalanczy
Hansen Soren R. Z.
Kalnins Charles M.
Tuckett Phillip C.
Conoco Specialty Products Inc.
Hart Charles
Holder J. E.
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