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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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Method and apparatus for electrostatically cleaning particulates from air
| Details |
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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 along with a method for 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 a pair of reticulated polyether foam filters for collecting the particulate matter. The foam filters are separated by a thin, grid-like layer of semiconductive material (carbon-impregnated polycarbonate) which is raised to a very high DC voltage. The foam filters are also surrounded by thin, grid-like layers of electrically conductive material which are held at ground potential, thus creating a high-voltage electric field through each of the foam filters. The polyether foam filter media is non-deliquescent, thus preventing the high-voltage electric field from being dissipated by such imbedded water vapor, which is the cause of filter inefficiency in the prior art. The electrostatic air cleaner of the present invention has such high initial efficiency that it does not require the addition of any particulate matter to its surfaces to achieve its nominal efficiency when first put into use. The air filter can be constructed in a relatively thin, rectangular shape, or in a cylindrical cartridge for use with industrial dust collecting systems. Both shapes lend themselves for ease of installation and removal within air handling systems. |
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DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Reference will now be made in detail to several embodiments of the present invention, examples of which are illustrated in the accompanying drawing, wherein like numerals indicate the same elements throughout the views.
Referring now to the drawing, FIG.
1 depicts the air cleaner of the present invention in a perspective view which is exploded so as to more easily understand the various layers of this air cleaner, which is generally designated by the numeral 10.
A hardware cloth support grill 20, preferably made of 1/4" hardware cloth, is located at the outlet side of air cleaner 10.
Hardware cloth support grill 20 is preferably fixed at ground potential by means which will be described in greater detail below.
This support grill provides both mechanical support for the air cleaner 10, and also, due to its being fixed at ground potential, creates a voltage gradient across certain other portions of the air cleaner.
There is a small hole 22 near the center of the hardware cloth support grill 20 in order for a wire 46 to be run through the support grill 20.
Adjacent to hardware cloth support grill 20 is a layer of filter media 30, which is preferably made of reticulated polyether foam, having a cell structure in the range of 20-90 pores per inch (ppi).
Such foam, known as "SCOTTFOAM.
TM.
", can be obtained from one of two manufacturers, FOAMEX, located at 1500 East Second Street, Eddystone, Pa.
, and Crest-Foam Corporation, located at 108 Carol Place, Moonachie, N.
J.
Reticulated polyether foam is non-deliquescent, meaning that it does not appreciably absorb water vapor from air as it is passed through the foam.
The reticulated polyether foam has an open cell structure, which allows particulates to be collected on the surface of the foam in the form of its dendrites and within the open pores.
The reticulated polyether foam used in the filter media 30 has a very high volume resistivity, on the order of 10.
sup.
12 ohm-centimeters, which allows a very strong electric field to be placed across the layer of foam
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