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| Thermoplastic three-dimensional fiber network |
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| Side restraint assembly |
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| Method for making a composite headliner |
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| Method for fabricating non-fiberglass sound absorbing moldable thermoplastic structure |
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| Mechanism for adjusting an extrusion die in cereal grain extruder apparatus |
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Apparatus for electrostatically cleaning particulates from air
| Details |
Inventors: Cheney, William A.; Spurgin, Wendell P.;
Assignee: United Air Specialists, Inc. (Cincinnati, OH)
Primary Examiner: Chiesa; Richard L.
Assistant Examiner:
Attorney, Agent or Firm: Frost & Jacobs
An electrostatic air cleaner is disclosed for use in removing particulate matter from moving streams of air. A high voltage ionizer is used as a corona source to ionize the particulate matter as it approaches the air filter portion of the electrostatic air cleaner. The air filter uses reticulated polyether foam filter media for collecting the particulate matter, and the filter media is non-deliquescent, thus preventing the high-voltage electric field from being dissipated by imbedded water vapor, which is the cause of filter inefficiency in the prior art. In one embodiment, the air filter uses strips of conductive material raised to a very high DC voltage interleaved between strips of conductive material held to ground potential, and these strips are oriented so as to be parallel to the direction of the air flow through the air filter's foam filter media, thereby creating an electric field that is perpendicular to the direction of air flow. In a further alternative construction, a charge accumulator is located adjacent to or within the ionizer to collect ions that migrate from the ionizer's electrodes to the collecting member of the charge accumulator. The charge accumulator is raised to a very high DC voltage and is electrically connected to the high-voltage conductive strips of the air filter, thereby eliminating the need for a high-voltage DC power supply to charge these conductive strips directly. |
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DETAILED DESCRIPTION Accordingly, it is a primary object of the present invention to provide an electrostatic air cleaner which achieves its nominal efficiency immediately and without the use of some artificial agent to coat the filter before its initial use.
It is another object of the present invention to provide an electrostatic air cleaner which does not absorb water vapor from the air stream passing through the filter, and therefore, does not reduce the electric field which is primarily important in maintaining the nominal efficiency of the filter.
It is a further object of the present invention to provide an electrostatic air filter having an open cell foam media which can accumulate particulate from the air flow and significantly decrease its rate of build up of differential pressure drop across that filter media.
The open cell pores of the media still allow air to pass through the filter media, while at the same time accumulating and retaining the particulates.
It is a yet further object of the present invention to provide an electrostatic air cleaner which maintains its efficiency at a reduced rate of pressure buildup as particulate accumulates on the face of the filter in the form of strands, also called dendrites.
It is yet another object of the present invention to provide an electrostatic air cleaner which includes a grid made of a material having high volume resistivity which can transmit a high voltage at its surfaces, yet will not arc while maintaining that high voltage state.
It is still a further object of the present invention to provide an electrostatic air cleaner which uses layers of open cell foam media to filter and collect particulate from the air, and uses layers of a material having high volume resistivity which can transmit a high voltage at its surfaces, yet will not permit formation of an arc while maintaining that high voltage state.
The plane of the layers is parallel to the direction of air flow through the air cleaner.
Another object of the present invention is to provide a cylindrically-shaped cartridge-type electrostatic air cleaner which can be used in industrial dust collecting systems
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Nonmetallic Processes 
