Gas separation – Plural serial basically diverse separating media – Plural stages in unitary casing
Patent
1997-08-14
1998-12-08
Woo, Jay H.
Gas separation
Plural serial basically diverse separating media
Plural stages in unitary casing
55345, 55353, 55429, 55DIG3, B01D 4512
Patent
active
058462732
DESCRIPTION:
BRIEF SUMMARY
CROSS-REFERENCES TO RELATED APPLICATION
Not Applicable
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
Not Applicable
BACKGROUND OF THE INVENTION
(1) Field of the Invention
The invention relates to dust separating apparatus, particularly but not exclusively to dust separating apparatus for use in vacuum cleaners.
(2) Description of the Related Art
Vacuum cleaners which incorporate dust separating apparatus consisting of two cyclones and a shroud are known. The cyclones are arranged one inside the other with the shroud located between them so that, in use, air first enters the low efficiency cyclone and then passes through the shroud before entering the inner, high efficiency cyclone. In order to ensure that the airflow in each cyclone follows an appropriate helical path, each cyclone has a tangential air inlet consisting of a conduit which approaches the relevant cyclone tangentially and terminates at the cylindrical or conical outer wall of the cyclone. Air flowing along the conduit then passes tangentially into the cyclone and follows the appropriate helical path.
The need for a tangential air inlet to each cyclone, combined with the belief that any irregular protrusions within the outer wall of the cyclone will disturb the airflow, has meant that, until now, all cyclonic dust separation means used in vacuum cleaners have had horizontal air inlets, ie. air inlets arranged perpendicular to the longitudinal axis of the cyclones. The development of a compact cylinder-type vacuum cleaner which utilises cyclonic dust separation apparatus has now created a need for such apparatus having an air inlet which is vertical or parallel to the axes of the cyclones. The provision of such apparatus in a vacuum cleaner would then allow a wand or hose to be attached to the inlet via a swivel coupling pivotable within a generally horizontal plane which then gives greater flexibility and freedom of movement of the wand or hose.
SUMMARY OF THE INVENTION
The invention provides a dust separating apparatus present and a vacuum cleaner. Preferable and advantageous features are set out in the detailed description.
As mentioned above, the invention allows a hose or wand to be coupled to the inlet via a swivel coupling. Also, because the conduit projects into the cyclone, the conduit is rendered easily visible and accessible thus facilitating the removal of blockages of the inlet. The projection of the conduit into the cyclone also means that the cyclone can be increased in length with the result that the cyclone has added capacity to collect separated dirt and dust.
An embodiment of the invention will now be described with reference to the accompanying drawings wherein:
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a sectional side view of dust separating apparatus according to the invention; and
FIG. 2 is a perspective side view of the inlet and shroud forming part of the apparatus shown in FIG. 1.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The apparatus 10 shown in the drawings is suitable for use in a vacuum cleaner. The apparatus 10 incorporates a dirty air inlet 12, an outer low efficiency cyclone 14, a shroud 16, an inner high efficiency cyclone 18, a fine dust collector 20 and an exit port 22. The outer cyclone 14, the shroud 16, the inner cyclone 18, the collector 20 and the exit port 22 are all of known design and do not form essential parts of the present invention. Therefore, they will be described only briefly here.
The outer cyclone 14 has an outer wall 14a having an inner surface 14b. A dirt and dust collecting area 14c is located adjacent the lower end of the outer wall 14a.
The inner cyclone 18 consists of a frusto-conical wall 18a having an inner surface 18b and a longitudinal axis 18c. The conical wall 18a terminates in a cone opening 18d which opens into the fine dust collector 20. The fine dust collector 20 is substantially larger in diameter at its outer walls 20a than the cone opening 18d. The outer walls 20a are connected to the frusto-conical wall 18a of the inner cyclone 18 by m
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McLeod Ian C.
Moyne Mary M.
Notetry Limited
Pham Minh-Chau T.
Woo Jay H.
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