Liquid purification or separation – Structural installation – Separator ancillary to storage tank
Patent
1997-06-03
1998-12-29
Lithgow, Thomas M.
Liquid purification or separation
Structural installation
Separator ancillary to storage tank
2104161, 210498, 21049701, B01D 35027, B01D 2933, B60S 148, F04D 2970
Patent
active
058535802
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD OF THE INVENTION
The invention relates to a filter for electric pumps of automobile vehicle windscreen washers. More specifically, the invention relates to an intake filter applicable to electric pumps coupled to reservoirs of cleaning liquid for the glazed surfaces of automobile vehicles.
BACKGROUND OF THE INVENTION
As is known, the electric pumps fitted ex-works to automobile vehicles for cleaning their glazed surfaces, and specifically the windscreen, rear window and often the headlights, comprise a suction-impulsion pump which draws in cleaning liquid contained in a reservoir provided for the purpose and impels it through ducts until it reaches jets which project it against said glazed surfaces.
The known embodiments of electric pumps comprise, in summary, a casing of generally elongated cylindrical shape in which are axially arranged a suction-impulsion pump and an electric drive pump connected to the electrical network of the vehicle. The suction-impulsion pump comprises an impulsion chamber in which is mounted an aspiration-impulsion turbine, with liquid entering the impulsion chamber through a tubular axial suction extension provided at its free end with transverse intake openings, the aspired liquid being discharged through an outlet nozzle arranged tangentially with respect to the impulsion chamber. The electric pump is coupled to the cleaning liquid reservoir by means of the axial tubular aspiration extension fitted inside the reservoir.
In order to prevent the aspiration of solid bodies contained in the cleaning liquid while the electric pump is running, the usual practice is to couple a filtering element to the axial tubular aspiration extension. The filtering element is made of elastic material and generally consists in a hollow cylindrical body open at one of its ends which, like a sheath, contains the axial tubular extension with a tight fit and pressing upon it over its entire length, while at its open end are arranged means for leaktight coupling of the electric pump and the reservoir, while at its other end, which is closed, there are to the side and front a plurality of orifices for the passage of the aspirated cleaning liquid, these orifices being so dimensioned as to retain those solid particles which might affect normal operation of the electric pump or block the liquid outlets of the aforesaid jets. In order to lend the filtering element suitable mechanical strength the side through orifices are arranged to form two diametrically opposed reticula.
The known embodiments of filtering elements such as those described above have as their main disadvantage the fact that said arrangement of side through orifices involves a need, during coupling of the filtering element with the axial tubular aspiration extension, to have said two through orifice reticula opposite the transverse aspiration openings, for otherwise said openings are blocked, totally or partially, by the side-wall portions of the filtering element which do not have side through orifices, thereby leading to loss of flow of aspirated cleaning liquid and preventing projection of same at the pressure and flow required for cleaning of the aforesaid glazed surfaces.
DESCRIPTION OF THE INVENTION
A filter for electric pumps of automobile vehicle windscreen washers of new structure and operation is made known hereby in order to provide a solution to the disadvantages presented by the known embodiments of filtering elements such as those described above, which specifically call for correct positioning of the filtering element with respect to the transverse aspiration openings of the axial tubular aspiration extension of electric pumps during their mutual coupling.
The filter for electric pumps of automobile vehicle windscreen washers of the invention can be coupled to electric pumps made up essentially of a casing in which is fitted axially a suction-impulsion pump and an electric drive motor, the suction-impulsion pump comprising an impulsion chamber, in which there is an aspiration-impulsion turbine, provided w
REFERENCES:
patent: 2684632 (1954-07-01), Horton
patent: 4444358 (1984-04-01), Spohn
patent: 4824021 (1989-04-01), Binder
Lopez Miguel Mota
Rusinol Luis Boguna
Fico Transpar, S.A.
Lithgow Thomas M.
Striker Michael J.
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