Gas separation – Plural serial basically diverse separating media – Plural stages in unitary casing
Patent
1997-08-14
1998-12-29
Smith, Duane S.
Gas separation
Plural serial basically diverse separating media
Plural stages in unitary casing
15353, 55410, 554591, 55473, 55DIG3, B01D 4512
Patent
active
058534407
DESCRIPTION:
BRIEF SUMMARY
CROSS-REFERENCES TO RELATED APPLICATIONS
Not Applicable
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
Not Applicable
BACKGROUND OF THE INVENTION
(1) Field of the Invention
The invention relates to an improved shroud and to apparatus incorporating an improved shroud.
A shroud is used in conjunction with cyclonic dust separation means to filter an airflow. In apparatus incorporating dual cyclonic separation means, ie. two separate cyclones arranged in series to remove, initially, larger pieces of dirt and fluff and, subsequently, finer dust particles, the shroud is positioned between the two cyclone arrangements and the airflow is passed through the shroud to reduce the possibility of larger pieces of dust and fluff entering the second, high efficiency cyclone.
(2) Description of the Related Art
It has been found that various features of the shroud have an effect on the overall performance of the separation means. It is therefore an object of the invention to provide a shroud which improves the overall performance of the cyclonic dust separation means in conjunction with which it is used.
PRESENT SUMMARY OF THE INVENTION
The invention provides a shroud as claimed in claim
Advantageous and preferable features are set out in the detailed description. When used in conjunction with dual cyclonic separation means, these arrangements improve the percentage of dirt, dust and fluff remaining in the low efficiency cyclone which, in turn, improves the performance of the high efficiency cyclone and thus of the entire separation means.
Embodiments of the invention will now be described with reference to the accompanying drawings, wherein:
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a side view, partially in section, of a shroud incorporating the present invention;
FIG. 2a is an enlarged sectional view of part of the wall of the perforated portion of the embodiment shown in FIG. 1;
FIG. 2b is an enlarged detail of the embodiment shown in FIG. 1;
FIG. 3 is a side view of a second embodiment of the present invention; and
FIG. 3a is an enlarged section through part of the wall of the perforated section of the embodiment shown in FIG. 3.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
FIG. 1 shows a shroud 10 having a cylindrical portion 12 in which is located a perforated portion 14. The perforated portion 14 has a lower edge 16 from which depends a lip 18 which will be described in greater detail below. Extending radially inwardly from the lower edge 16 of the perforated portion 14 is an annular web 20 which communicates with or seals against an inner cyclone 22. The inner cyclone 22 forms no part of the present invention and will not be described in any further detail here. The web 20 effectively forms support means for and a seal against the cylindrical portion 12. Further support and sealing means 24 are located at the upper edge of the cylindrical portion 12 but which, again, do not form part of the present invention, except to support the cylindrical portion 12.
FIG. 2a shows, in sectional view, a portion of the wall 26 forming the perforated portion 14. The wall 26 has an upstream surface 28 and a multiplicity of perforations 30 through which, in use, the airflow passes in the direction of arrows 32. In prior art shrouds, the perforations have been formed in such a manner that the upstream edge of each perforation incorporates a radius at its intersection with the upstream surface of the shroud. According to the present invention, the upstream edge of each perforation 30 meets the upstream surface 28 at a sharply defined angle. Such an angle can be produced by forming the perforations 30 by drilling or, if desired, by molding or any other suitable manufacturing process. The provision of a sharp angle at the intersection between the upstream edge of each perforation 30 and the upstream surface 28 of the shroud 10 decreases the amount of fine dust passing through the perforations 30 and therefore decreases the risk of the perforations 30 becoming blocked by dust and fluff particles.
The thick
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McLeod Ian C.
Moyne Mary M.
Notetry Limited
Smith Duane S.
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