Gas separation: apparatus – Solid sorbent apparatus – Plural diverse separating means
Reexamination Certificate
1999-08-18
2001-05-08
Spitzer, Robert H. (Department: 1724)
Gas separation: apparatus
Solid sorbent apparatus
Plural diverse separating means
C096S138000, C096S153000, C055S497000, C055S500000, C055S501000, C055S509000, C055S513000, C055S521000
Reexamination Certificate
active
06228152
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a filter device for equipping an apparatus for ventilating and/or heating and/or air conditioning, more particularly for a vehicle.
A first object of the invention is to improve the efficiency and useful life of such a filter device.
Another object of the invention is to make it easier to change the filter device when it is clogged.
Yet another object of the invention is to make it easier to recycle such a filter device, in particular where the filter includes means for adsorbing harmful gases.
BRIEF SUMMARY OF THE INVENTION
These objectives are obtained by one or other of the following features of the invention, and by any of their technically possible combinations:
the filter device includes a flexible grid which is surrounded by a relatively flexible frame;
a mat of non-woven material, comprising of a carded web, is applied against the grid and constitutes a particle filter;
the mat of non-woven material comprising of a carded web is applied against the grid without being fixed to the latter;
the carded web constitutes a single fabric layer;
the carded web is placed upstream of the grid in relation to the normal direction of flow of the gas to be filtered;
the filter device includes gas adsorption means placed between the grid and the non-woven mat;
the adsorption means comprise an activated carbon tissue;
the activated carbon tissue is flexible;
the adsorption means comprise a bed of activated carbon;
a mat of non-woven material, comprising of a carded web, is disposed on either side of the adsorption means;
a second grid, being a so-called inlet grid, is disposed upstream of the mat of non-woven material;
both grids are of the same nature;
the two grids are of different natures;
at least one of the dimensions of the carbon tissue and preferably each of them, is smaller than the corresponding dimensions of the grid or each grid and that of the frame, so that on at least one side of the carbon tissue, the latter is at least partially spaced away from the frame;
one grid, or preferably both grids, are pleated;
the non-woven mat is pleated;
the carbon tissue is pleated;
the grid is of polypropylene;
the second grid is of polypropylene;
the mat of non-woven material is based on long fibres, the length of which is preferably at least 38 mm;
the long fibres have a mean diameter which at least 10 &mgr;m;
the fibres are of thermoplastic material;
the fibres are polypropylene fibres;
the frame is of polypropylene foam or porous polypropylene;
the frame is fixed to the grid by mirror welding
the frame is fixed to the outlet grid, and also to the second grid, by mirror welding;
the frame is moulded over the grid;
the frame is moulded over the grid and over the mat of non-woven material;
the frame is also moulded over the second grid;
all or some of the lateral ends of the grid are curved in such a way as to follow the corresponding wall or walls of the frame.
The filter device in accordance with the invention has improved efficiency and offers a reduced loss of energy in the air to be filtered than do the filters in the state of the art.
In addition, the filter device according to the invention is preferably in the form of a flexible cassette, which is such that it can be deformed temporarily in all directions while being inserted or removed in an apparatus for ventilating and/or heating and/or air conditioning, which considerably facilitates the corresponding operations, especially where accessibility to the housing of the filter device is, as is most commonly the case, not easy to obtain.
Thanks to the construction of the filter device according to the invention, the assembly of the various parts of the filter can be carried out without making use of any solvent or adhesive, while excellent sealing is obtained between the frame and the various active parts of the filter.
The flexibility of the frame advantageously enables it to be sealed at its periphery without there being any need to provide a sealing gasket.
In addition, the flexibility of the frame contributes to the prevention and absorption of vibrations and noises in the filter, and in the duct in which the filter is placed.
After use, the filter device according to the invention can easily be recycled after its various component parts have been separated from each other, which is facilitated in particular when the carbon tissue is out of contact with the frame.
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International Search Report dated Apr. 19, 1999.
Guerin Richard
Jacq Gerard
Navarro Claude
Morgan & Finnegan , LLP
Spitzer Robert H.
Valeo Equipements Electriques Moteur
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