Gas separation: apparatus – With gas and liquid contact apparatus – Fixed gas whirler or rotator for gas separation
Reexamination Certificate
1999-04-26
2001-03-27
Spitzer, Robert H. (Department: 1724)
Gas separation: apparatus
With gas and liquid contact apparatus
Fixed gas whirler or rotator for gas separation
C096S318000, C096S345000, C096S350000, C096S354000, C096S357000, C096S364000, C055S472000, C055S473000, C055SDIG003
Reexamination Certificate
active
06206955
ABSTRACT:
This invention has for an object a vacuum cleaner apparatus with at least three stages of dust collection, of the type with an air siphon path partially submerged in water and provided with a separation labyrinth.
The innovation finds particular even if not exclusive application in the field of the electric appliances, with a high qualitative standard, also professional, intended for a thorough cleaning and at the same time for a hygienizing of the surfaces and of the air in the rooms.
TECHNICAL FIELD
The vacuum cleaner fittings belong to the state of the art for a long time. The traditional ones, are essentially made up of a body supported by small feet or pivoting wheels, on whose inside a motor unit is provided for the sucking of the external air, together with the dirt, for being filtered and again put in circulation. Such apparatus, by sucking the air through an extension or elephant trunk, held by the user, commonly allows, according to the need, the dusting of carpets, mats, door-mats, moquette, and similar surfaces, but more recently also of the same floor, by means of electric brooms. The air thus sucked, at first gets through at least one filter, which is generally made up of the same dust collection bag, for then being let in again once been filtered, as has already been disclosed, in the surrounding environment. Generally, the bag-filter is realized in a particular type of paper fabric with thick stitches, thus allowing the discharge of the sucked air, but retaining only the macrodust and the thicker dust in its inside.
In the described solutions different drawbacks are noticeable. Among these, it is mentioned that a careful cleaning of the treated surface does not seem possible, but above all, that the air still partially dirty, once sucked, is again let in the environment, transporting a large quantity of dust that for a certain time remains in suspension. This occurs because of the apparatus structure, which even if providing for the dust removal, cannot retain it completely in the traditional sachets-filter. This fact can also not be a particular worry for the healthy people, as they do not feel immediate benefits from a more careful cleaning, differently from the people who suffer of allergy. At this purpose, it is scientifically proved that the household or the work environment, may be particularly favourable to the rising of allergic symptoms, which mostly in the periods of maximum evolution, as for example when the heating is on, regularly occur. These symptoms are mainly originated from the volatility of the microdust and of the mites that form it, using it as their nourishment. People particularly sensitive to dust, have the need to repeat the cleaning treatment several times, by frequently replacing the filter, which is an operation that any way does not offer satisfactory results.
A recent solution, used to solve the problem, consisted in providing, as combined with a traditional vacuum cleaner, the use of a device also suitable for a simultaneous washing of the surfaces. More in particular, said apparatus consists always of a body, movable, to which a motor suction unit is associated, but in whose inside it is obtained a tank containing the water to be distributed on the surfaces to be treated. The air, together with the water previously dispersed by a delivering device applied on the elephant trunk, is subsequently sucked and thus let inside of said tank. Here, a kind of perpendicular fan placed in correspondence of the exit hole of the sucked air, by rotating, creates a hollow area that by avoiding the recirculation of the fine dust stirs both water and air at the same time. Thus it will be obtained a precipitation of water and dust thanks to its catalytic effect, discharging in the surrounding environment only the sucked air, partially cleaned from such residues.
The suggested solution has some drawbacks, which first of all consist of the fact that the afore mentioned apparatus cannot work exclusively as a vacuum cleaner. Secondly, when the surfaces are treated with liquids, they remain, even if just for a small period, rather damp, having their utility and functional range limited. The third but not the least aspect is that it would be a rather complex apparatus and that it does not allow to further optimize the filtering function of the sucked air.
In the Italian Patent application for industrial invention n.TV91A000117, a vacuum cleaner apparatus and relative filter is particularly described, in which it is provided a body for the support of a suction group, and a container, on whose inside is engaged, in contact with an amount of water previously let in and in proximity of the suction mouth, a filter, said filter being obtained from the manufacturing of vegetable and/or animal fibres. Also the Italian patent Application for industrial invention n.TV92A000005, It belongs to the prior art, consisting of an improvement to the previously mentioned patent, in which it is provided that inside of the container there is:
a first filter, being made up of an air delivering means at least partially submerged into an amount of water contained in the underlying tank, said means being directly connected to the manifold for the suction of the air coming from outside;
a second filter, being engaged on the upper part and in proximity of said means for the delivering of the sucked air, said filter being obtained from the manufacturing of vegetable and/or animal fibres;
some water previously let in the underlying retaining tank, which submerges at least partially said delivering means.
One of the just described purposes of the invention is also to avoid some drawbacks occurred when using the previous fittings. More in particular, it was noticed that the main problems would merge on the type of filter, which, besides being hardly accessible, would be frequently clogged requiring a constant maintenance such to require its resetting at the end of each use. Consequently, during the cleaning operations there will progressively be a substantial reduction of the filtering power to the detriment of the benefits for which a certain type of apparatus was chosen, but above all making useless even the more traditional cleaning. Also another drawback is that such apparatus would not allow the collection of eventually dispersed liquids, being mainly limited to sucking only the air together with the fine dust in general. And in fact, the increase of the level of liquid inside of the container could interfere with the good functioning of the motor, which may thus be damaged and become very dangerous.
More recently, always the same applicant, has provided an improved vacuum cleaner apparatus of the type essentially divided in two parts, respectively; a first upper one that includes the body for the support of a suction motor unit placed into an opening coated by acoustic insulating material and buried into a first annularly positioned filter, and a lower one consisting of:
a water container, essentially cone-shaped, peripherally engaged to said body by lever hooking means,;
a cylindrical element without ends placed inside of said container supported along the edge and partially immersed into water, thus obtaining between the facing walls, perpendicular to the bottom, an annular interspace, thus making up a siphon, which is the forced path of the air and/or of the liquid sucked from outside through sucking means;
at least one holed disc for the dirt separation, serving as a base of the cylindrical element and submerged by the water provided in the container;
one or more filters also with differentiated density which are not in contact with the water, where one of them is supported by the cylindrical element, thus defining an intermediate air cushion.
In the just described solution, the mentioned drawbacks can be summarized in the excessive complexity of the structure, which derives from the presence of the many filters which are inside of the separation container, that would also reduce its suction effectiveness. Additionally, notwithstanding the presence of more intermediate filt
Harrison & Egbert
Spitzer Robert H.
W.S. S.p.A.
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