Gas separation – With concentrate backflow or re-entrainment preventing means – Baffle intermediate concentrate collector zone and gas...
Patent
1997-08-08
1999-04-13
Bushey, C. Scott
Gas separation
With concentrate backflow or re-entrainment preventing means
Baffle intermediate concentrate collector zone and gas...
55447, 554591, A47L 916, B04C 5185
Patent
active
058939385
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to apparatus for separating dirt or dust particles from an airflow by cyclonic means. The invention relates particularly, but not exclusively, to cyclonic dust separation apparatus for use in a vacuum cleaner.
DESCRIPTION OF THE RELATED ART
Cyclonic dust separation apparatus typically comprises a frusto-conical cyclone having a tangential air inlet at the end having the larger diameter and a cone opening leading to a dirt or dust collector at the end having the smaller diameter. The dust collector is generally cylindrical in shape and is considerably larger in diameter than the cone opening, normally having a diameter of at least three times that of the cone opening. In operation, an airflow carrying dirt and dust with it enters the cyclone via the air inlet and, by virtue of the tangential orientation of the air inlet, is set into a swirling motion over the interior surface of the cyclone. Most of the air of the airflow escapes from the cyclone by passing towards the longitudinal axis of the cyclone and exiting via an exit passage arranged substantially centrally of the end of the cyclone having the larger diameter. The remainder of the airflow spirals towards the cone opening at increasing angular speeds carrying the dirt and dust with it and is ejected into the dust collector, whereupon the dirt and dust particles are flung towards the cylindrical wall of the collector. The dirt and dust particles then collect in the lower regions of the cylindrical wall, whilst the remainder of the airflow exits from the collector via the cone opening and the exit passage.
It is generally desirable for cyclonic dust separation apparatus to be relatively compact, particularly as regards the overall length of the apparatus, ie, the dimension parallel to the longitudinal axis of the cyclone. If the apparatus is used in a vacuum cleaner, compact dust separation apparatus reduced the overall dimensions of the complete cleaner and lowers the centre of gravity of the cleaner which, in turn, increases its stability. This is particularly advantageous in cylinder-type cleaners as well as upright-type vacuum cleaners.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide dust separation apparatus which is relatively compact without any significant loss of dust separation efficiency.
The present invention provides an apparatus for separating dirt or dust from an airflow. The apparatus has a frusto-conical cyclone with a tangential air inlet located at or adjacent to one end of the cyclone having the larger diameter. The apparatus also has a cone opening located at the other end of the cyclone having the smaller diameter.
A collector is arranged to surround the cone opening and has a base surface facing towards the cone opening. The collector has at least one side surface and a dust-retaining wall. The dust-retaining wall has a free upper end and is provided spaced apart from the center of the base surface of the collector. Optionally, a portion of the base surface of the collector can be conical or frusto-conical in shape.
Advantageous features of the present invention will become increasingly apparent by reference to the following drawings and the description.
Dust separation apparatus of the type mentioned at the outset is often required to be located at an angle to a fixed surface. In the case of an upright-type vacuum cleaner, which is restricted in its overall height for practical reasons, the body of the cleaner containing the dust separation apparatus is tilted in use with respect to the cleaner head so as to facilitate the movement of the cleaner head over the surface to be cleaned. Also, in cylinder-type vacuum cleaners, it is advantageous to position the centre of gravity as close as possible to the surface to be cleaned and this can be assisted by tilting the dust separation apparatus with respect to the said surface. It has been known to provide a collector having a base surface with a conical or frusto-conical portion. This allows the apparatus
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Bickerstaff Simon Mark
Dyson James
McRae Thomson Andrew Walter
Bushey C. Scott
McLeod Ian C.
Moyne Mary M.
Notetry Limited
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