Liquid purification or separation – Tangential flow or centrifugal fluid action
Patent
1992-03-18
1994-01-04
Dawson, Robert A.
Liquid purification or separation
Tangential flow or centrifugal fluid action
554591, 55462, 138 39, 138 42, 138 44, 210787, 96208, B65G 5360
Patent
active
052757307
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a dip pipe for apparatuses for the separation of mixtures made up of one liquid or gaseous medium and one liquid or gaseous substance having a higher specific gravity than the medium under the action of centrifugal forces, the medium freed at least partially from the substance being removed from the apparatus through this pipe, with a baffle means at one end of the dip pipe, wherein the baffle means consists of at least one curved baffle and wherein the distance of the baffle from the longitudinal axis of the dip pipe becomes increasingly smaller in the peripheral direction. Facilities for the separation of mixtures of at least one substance and one medium have been known, for example, from EP-A-398,864.
In these known devices, dip pipes are provided for the discharge of the medium freed at least in part, preferably entirely, from the substance or substances to be separated; these dip pipes project into the separating chamber.
It is also known from EP-A-398,864 to arrange baffle devices, in the form of baffle plates, between the dip pipes, these baffle devices extending in the direction of flow from the inside toward the outside in order to effect reversal of the flow direction of the medium when passing from the chamber wherein the substance mixture is set into rotation into the chamber where the actual separation takes place.
Furthermore, baffle means at dip pipes are known in the prior art (for example, Austrian Patent 13,036, British Patent 245,636), which comprise baffle plates; however, the latter are curved about the dip pipe vertical axis. This results in an exclusively radial acceleration which, however, does not contribute anything toward transfer of the medium into the dip pipe.
Further, propeller-like baffle devices are known in the state of the art having several vanes at the inlet end of the dip pipe wherein the individual vanes are oriented so that they reduce or entirely eliminate the rotary movement of the medium entering into the dip pipe. These arrangements, however, have not become popular in practice on account of problems encountered in flow dynamics. The reason for this unpopularity is that the actual flow directions in the region of the dip pipe orifice are unknown.
SUMMARY OF THE INVENTION
The invention is based on the object of further developing the conventional dip pipes in such a way that transfer of the medium is improved from the separating chamber into the dip pipe, or dip pipes, in case two pipes are disposed in a mutually coaxial position and discharge medium into opposite directions. In particular, the embodiment of the dip pipes according to this invention is to be suitable for separating devices in accordance with EP-A-398,864.
According to this invention, this object has been attained in a dip pipe of the type discussed hereinabove by providing that the radii of the baffle lying in planes normal to the axis increase in the axial direction from the free rim of the baffle in opposition to the dip pipe toward the orifice of the dip pipe.
Owing to the fact that the medium, set into rotation, has imparted to it, due to the baffle means of this invention, in the region of the dip pipe orifice not only a radial acceleration but also an axial acceleration, i.e. an acceleration in the discharge direction of the medium through the dip pipe, passage of the medium from the separating chamber into the dip pipe, or the dip pipes in case two dip pipes are provided, takes place in a favorable way from the viewpoint of flow dynamics, and with low loss of energy.
Passage into the dip pipe or dip pipes is improved on account of the feature that the baffle imparts to the medium, in the space lying outside of the dip pipe orifice and within the jacket surface of the dip pipe, simultaneously an acceleration that is oriented radially inwardly and an axial acceleration.
Since the baffle in the invention consists of at least one curved baffle inclined at an acute angle with respect to the axis of the dip pipe, the medium, due to the desi
REFERENCES:
patent: 3841568 (1974-10-01), Broad
patent: 4769050 (1988-09-01), Shaw et al.
patent: 5180257 (1993-01-01), Narishima et al.
patent: 5181943 (1993-01-01), Weber
Dawson Robert A.
Reifsnyder David
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