Electric lamp and discharge devices: systems – Discharge device load with fluent material supply to the... – Electron or ion source
Patent
1989-11-15
1991-04-30
LaRoche, Eugene R.
Electric lamp and discharge devices: systems
Discharge device load with fluent material supply to the...
Electron or ion source
361230, 361231, 250324, H01J 724, H01T 2300
Patent
active
050121596
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an arrangement for transporting air with the aid of a so-called electric ion or corona wind, and preferably cleansing the air at the same time.
2. The Prior Art
It is known that air can be transported with the aid of a so-called electric ion wind or corona wind. In principle, such an arrangement comprises a corona electrode and a target electrode which are mutually spaced apart and each of which is connected to a respective terminal of a d.c. voltage source, the configuration of the corona electrode and the potential difference and also the distance between the corona electrode and the target electrode being such as to generate at the corona electrode a corona discharge which produces air ions. These air ions migrate rapidly to the target electrode, under the influence of the electric field between the corona electrode and target electrode, and give their electric charge to the target electrode. During their movement towards the target electrode, the ions collide with electrically neutral air molecules, thereby also transferring the electrostatic forces to these latter molecules, so that they are also entrained towards the target electrode, thereby establishing air transportation in the form of a so-called ion or corona wind. Air transporting arrangements of this kind are found described, for instance, in international patent application PCT/SE85/00538.
When the air contains contaminant aerosols, i.e. suspended solid particles or liquid droplets, these contaminants will be charged electrically by the air ions generated by the corona discharge, and hence the contaminants, or impurities, can be precipitated electrostatically on the target electrode, provided that the electrode is suitably configured, or in a capacitor separator located downstream of the target electrode. Thus, it is possible in principle to provide an air cleansing arrangement with which air can be transported through the arrangement and contaminant aerosols extracted from the air with the aid of the air ions produced by a corona discharge.
The ability to produce in practice such an arrangement which will satisfy the requirements desired thereof, such as large volumetric air throughflows, high cleansing ability, small dimensions, reasonable potential difference between corona electrode and target electrode, and therewith reasonable high voltage levels, and a corona current which has an acceptable value with regard to the harmful gases generated by the corona discharge, particularly ozone and oxides of nitrogen, has been found to be associated, however, with several not-readily solved and closely related problems. Consequently, an arrangement of this kind which can be used in practice is not yet available commercially.
As disclosed in the aforesaid international patent application, it is possible to achieve both significant air-flow speeds and considerable volumetric air through-flows with the aid of a corona current which is acceptable with regard to the generation of ozone and other harmful gases, when the corona electrode and target electrode are located at a considerable distance apart and the corona electrode is screened effectively, so that the product of ion current and ion-migration distance in an upstream direction away from the corona electrode is negligibly small. An increase in the distance between corona electrode and target electrode, however, requires an increase in the potential difference between corona electrode and target electrode, in order to ignite the corona electrode effectively. The consequence hereof is an increase in high voltage levels of the corona electrode and/or target electrode, which in turn results in insulating and spark-over problems. In addition hereto, the need to prevent unintentional touching of the high-voltage electrodes is also increased. When the corona electrode and target electrode are spaced axially from one another in a straight air flow duct or passageway, which is primarily the most natural arrangement, it
REFERENCES:
patent: 4231766 (1980-11-01), Spurgin
patent: 4317661 (1982-03-01), Sasaoka et al.
patent: 4364752 (1982-12-01), Fitch et al.
patent: 4380720 (1983-04-01), Fleck
patent: 4521229 (1985-06-01), Baker et al.
patent: 4602921 (1986-07-01), Schinohara et al.
patent: 4812711 (1989-03-01), Torok et al.
Loreth Andrzej
Torok Vilmos
Astra Vent AB
LaRoche Eugene R.
Yoo Do Hyun
LandOfFree
Arrangement for transporting air does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Arrangement for transporting air, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Arrangement for transporting air will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-642857