Gas separation: apparatus – Electric field separation apparatus – Electrode cleaner – apparatus part flusher – discharger – or...
Reexamination Certificate
1998-12-01
2001-03-20
Chiesa, Richard L. (Department: 1724)
Gas separation: apparatus
Electric field separation apparatus
Electrode cleaner, apparatus part flusher, discharger, or...
C055S520000, C055SDIG005, C096S050000, C096S094000, C096S098000, C264S280000, C264SDIG004
Reexamination Certificate
active
06203600
ABSTRACT:
FIELD OF THE INVENTION
This is a national stage application of International Application No. PCT/SE97/00956, filed Jun. 3, 1997.
The present invention refers to a precipitator having a through-flowing passage for the air to be purified, said precipitator being intended to be included in an air purification device, especially for purifying air from electrically charged particles, said precipitator being electrically connected to a high voltage source and comprising at least two electrode elements or groups of such elements arranged at different potential relative to each other, said electrode elements being designed as band-like strips that are arranged to circle at least once, and preferably several times, around an imaginary axis at a gap distance, seen in radial direction relative to the imaginary axis, from adjacent electrode elements, that the extension of the electrode elements in the air flow direction is essentially less than their circled length around the imaginary axis. The invention also refers to a method for manufacturing a precipitator according to the present invention.
BACKGROUND OF THE INVENTION
In SE-B-469 466 a two step electro filter having an ionization section is described, said section being downstream followed by a so called precipitator. The electrode elements of the precipitator according to the mentioned patent application constitute of planar plates that comprise high resistant non-metallic material, said material also being designed as antistatic (so called dissipative material). By such a material an essential improvement of the separation ability is achieved compared to the traditional design, i.e. electrode elements of the precipitator comprising metallic material, and the voltage between the electrode elements can reach a higher level than in connection with traditional electrode elements manufactured from material having low resistivity. Further a new design for the ionization chamber is disclosed, said design being very simple and very efficient in terms of particle charging and with an exceptionally low emission of ozone.
In SE 9303894-1 is described a further development of the design of a precipitator according to the patent application mentioned above. By screening of the edge sections of the electrode elements of the precipitator possibilities are achieved, according to this patent application, to further increase the voltage between said elements and thus an increased separation ability.
In spite of an improved performance and new design of the electro filter cassette, inter alia from a cellulose based material and very simplified design of the ionization chamber, said inventions have not initiated an increased use of air purification devices and also not in other applications as for instance filters in ventilation ducts, coupe filters, filter for cooking fumes, a so called cooker hood, or in more industrial application areas, although the need of fresh air no longer might be questioned and although the electro filter technique in many aspects is much better than the traditional filter technique comprising so called barrier filters.
The reason for this very restricted use of the electro filter technique might be that systems for air purification also must fulfil other essential demands, apart from the air purification efficiency, to become accepted within wider circles of users.
These demands vary essentially depending on application area but they are also very different within the same application area for different users and different environments having different pollution load etc.
To exemplify certain demands that must be set up within at least one area of use, for instance separate air purifiers as a complement to existing ventilation, one can mention low initial cost/running charges per m
3
purified air, low noise level, flexible location possibilities and adaption to different interiors, a simple way to operate the set-up, low cost for replacement cassettes, the way to handle used filter cassetes adapted both to the environment but also to the status of the user, for instance a healthy person or a person allergic to dust/an asthmatic person, long life of the devices etc.
SUMMARY OF THE INVENTION
The invention primarily aims at a new design of precipitators having a wide area of use, inter alia as duct filters, separate air purifiers, cooker hoods/filters, coupé filters etc. but also the design of the casing and also the design of the surrounding equipment for the cleaning and service of the device, all in view of answering to the above mentioned demands.
Thus, it is of no importance in which way the charging of the aerosols take place before they are transported through the device. Charging of the aerosols may occur in so called ionization chambers arranged in the air flow passage upstream of the precipitator, seen in the air flow direction through the device, or charging may take place in the space where the device is located or in some other way.
REFERENCES:
patent: 2926749 (1960-03-01), Oswald
patent: 4313741 (1982-02-01), Masuda et al.
patent: 4354861 (1982-10-01), Kalt
patent: 5198003 (1993-03-01), Haynes
patent: 5766318 (1998-06-01), Loreth et al.
patent: 5980614 (1999-11-01), Loreth et al.
patent: 5993521 (1999-11-01), Loreth et al.
patent: 2332418 (1974-05-01), None
patent: 6-31200 (1994-02-01), None
patent: WO93/16807 (1993-09-01), None
patent: WO 95/14534 (1995-06-01), None
Chiesa Richard L.
Eurus Airtech AB
Siemens Patent Services LC
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