Liquid purification or separation – With repair or assembling means – Hoist or handle means
Patent
1995-05-26
1998-11-17
Popovics, Robert
Liquid purification or separation
With repair or assembling means
Hoist or handle means
2103601, 2103801, 2103803, 210398, 210402, 210403, B01D 33067
Patent
active
058371389
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a device for separating one or more components from a fluid such as gas, water, oil and so on, which device is provided with a closed drum-like carrier driven rotatably on an axis and having means for feeding and discharging the fluid.
2. Description of the Prior Art
It is known for separation of components from a fluid to set the fluid into rotation, whereby as a result of the centrifugal force the components will separate from the fluid in layers round the axis of rotation, whereafter discharge thereof becomes possible and whereby the fluid can for instance be cleaned. Conceivable here is the cleaning of flue gases, waste water, contaminated oils and the like, The drawback to such a system is that it is hardly suitable for removing solids from a fluid and that separation can take a long time when there are small differences in specific weight.
It is also known to have filtration take place via a turning drum, the so-called filter centrifuge. Herein the outer wall of the drum is wholly or partially replaced by a filter material. Due to the centrifugal force the mixture for filtering is pressed through the filter material. The material for filtering out is stored on the filter material and there forms a filter cake. The drawback to such a system is that after a shorter or longer time the filter cake clogs the filter material so that further through-flow becomes impossible. Embodiments are known wherein the filter cake is removed with a mechanical scraping device.
SUMMARY OF THE INVENTION
The invention has for its object to obviate the above stated drawbacks and to provide a device wherein the function of centrifugal separation of two or more fractions and the filtering of solid portions out of a medium are combined in one machine. The device according to the invention is distinguished in that one or more filter elements are arranged in the carrier, wherein each filter element has a fluid duct extending between the rotational axis and drum wall.
When the mixture for separating is carried into the turning drum it will be moved by the centrifugal force to the outer wall. Before leaving the drum again via the filters, a part of the heavier fraction will deposit on the drum wall and there form a cake. The mixture, with therein a much smaller proportion of the heavier fraction, will leave the drum via the filter elements under influence of the pressure resulting from the centrifugal force.
It is noted that in known filter systems for filtering contaminated fluid the filters become clogged rather quickly and have to be replaced. In the proposed embodiment the most contaminated portions of the fluid lie as far as possible from the rotation centre, whereby the filter will first be filled with sludge in the part located as far as possible from the rotational axis, but whereby the filtering action will begin to take place more towards the centre of rotation. The filter elements therefore need replacing less quickly.
In a first embodiment the invention proposes to cause the fluid duct in the filter to debouch in the drum wall. As a result of the rotating action, transport of the cleaned fluid through the filter takes place automatically.
In a second embodiment the invention proposes to cause the filter duct to debouch in a central drain duct arranged in the rotational axis. The advantage is here achieved that, although a pressure transport will be necessary to carry the fluid through the duct, the filter elements themselves will be less loaded by pressure differences. In the preferred embodiment use is made of a cylindrical filter element, of which the centrally located fluid duct extends radially in relation to the rotational axis. Such a disposition provides the advantage of being able to use known filter elements and filtering technique in a new application without the drawbacks of normal filtering.
Finally, the invention proposes to place the rotational axis vertically in order to hold imbalance of the drum and contents to a minimum
REFERENCES:
patent: 2956683 (1960-10-01), Kinney et al.
patent: 5149432 (1992-09-01), Lavin
patent: 5460717 (1995-10-01), Grimwood et al.
Popovics Robert
Rowe Parsons International Inc.
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