Gas separation – Multiple bag type filters in chamber – Gas flow from inside to outside of filter
Patent
1991-10-25
1993-01-12
Nozick, Bernard
Gas separation
Multiple bag type filters in chamber
Gas flow from inside to outside of filter
55429, 55483, 55502, B01D 4600
Patent
active
051786559
DESCRIPTION:
BRIEF SUMMARY
Many cleaning devices meant to evacuate solid particles, such as dust, waste, and so forth, by suction are known.
All of them include a motor and a turbine that brings about negative pressure in a hose, one end of which must be placed in front of the zone to be cleaned and the other of which is located at the inlet to a chamber containing at least one flexible wall, such as a bag, through which the turbine aspirates the air and which plays the role of a filter, because it retains the solid particles while allowing the air aspirated by the turbine to pass through.
The flexible wall is generally disposed vertically on a reinforcement having an opening in its lower part, located on top of a recovery bin into which the solid particles not stuck to the flexible wall drop by gravity. When the flexible wall is cleaned or replaced, it is primed by being shaken, to cause the maximum amount of particles and dust to drop into the recovery bin.
The bin is mounted movably in a compartment from which it is removed to empty its contents.
The dust-laden air is introduced into the compartment, and to avoid excessive suction losses this compartment is closed by means of a door that is pressed against a frame, in between which a sealing gasket is interposed.
Such a structure proves unsatisfactory, for various reasons:
For simple geometrical reasons, the recovery bin cannot occupy precisely the entire interior volume of the compartment, because some play must be provided to enable movements of the bin, which is movable with respect to the fixed compartment. As a result, solid particles drop outside the bin into the compartment, rather than into the interior. These particles accumulate and finally create piles, which as they grow eventually impede the movements of the bin.
The bin is thus forced back little by little, and a time comes when the door of the compartment cannot be closed except by forcing the bin, and then, as circumstances necessarily become worse, it becomes impossible to close the door. The bin must then be removed and the compartment cleaned by hand, which is a difficult operation.
The successive openings and closing of the door quite naturally cause wear of the gasket, whose efficiency is degraded until such time as it must be replaced. For reasons of economy, however, one waits as long as possible before changing the gasket, so that little by little and one might say imperceptibly, the seal lessens, so that the turbine aspirates external air through the spaces not closed by the door, instead of aspirating the air laden with dust exclusively by the hose. In practice, this can cause an up to 80% loss in efficiency of the equipment.
The flexible wall or bag is fixed to a frame by means of bolts, which are a hindrance to easy removal of the bag for cleaning or replacement. Moreover, the bag must be removed and reinserted via the upstream side of the system, that is, the dirty side that is dusty from the dust-laden air, making it a toilsome operation.
To define the prior art, the following may be cited:
British Patent A 865,262, which describes a vacuum cleaner including a bin that contains a dust bag, and a lid surmounting the bin and bag assembly, inside which a filtering wall is disposed.
This filtering wall is kept in shape by a complex reinforcement so that it can be kept taut.
A sealing gasket that may be supported by the lid or bin is disposed between the lid and the top of the bin.
Hooks that pivot on articulated parts fastened to the bin cooperate with holes made in the lid, to assure the closure of the vacuum cleaner and to hold the bin against the sealing gasket.
Because of the presence of a dust bag disposed in the bin, a not-insignificant proportion of the dust drops outside the bag, since there is a lack of a seal between the bag and the bin. The result is soiling of the bin, which necessitates its cleaning simultaneously with the cleaning of the bag. Moreover, the filter is fastened to a complex metal reinforcement, which causes it to wear down by friction.
U.S. Pat. No. 2,044,827, which describes
REFERENCES:
patent: 2044827 (1936-06-01), Adams
patent: 3422602 (1969-01-01), Janson
patent: 3906756 (1975-09-01), Bone
patent: 3910781 (1975-10-01), Bryant, Jr.
patent: 4222753 (1980-09-01), Mills
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