Air transporting arrangement

Details Air transporting arrangement Air transporting arrangement

1990-09-27

1991-10-01

Pellinen, A. D.

Electricity: electrical systems and devices

Electric charge generating or conducting means

55150, 55152, B03C 300, H01T 1904

Patent

active

050539124

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to an arrangement for transporting air with the aid of so-called electric ion-wind or corona-wind.
It is previously known that air can be transported with the aid of a so-called electric ion-wind or corona-wind. In principle, such an arrangement will comprise an airflow duct which includes at least one corona electrode and at least one target electrode which are spaced axially apart in the airflow duct, with the corona electrode located upstream of the target electrode and in which each of the electrodes are connected to a respective terminal of a d.c. voltage source, wherewith the configuration of the corona electrode and the potential difference and distance between the corona electrode and the target electrode are such as to create at the corona electrode a corona discharge which generates air ions. The air ions migrate rapidly to the target electrode, under the influence of the electric field present between corona electrode and target electrode, and deposit their electric charge at the target electrode. During their travel to the target electrode, the ions collide with electrically neutral air molecules, therewith also transferring electrical forces to these latter molecules, such as to entrain said air molecules in a direction towards the target electrode, whereby air is transported in the form of a so-called ion or corona wind. Various embodiments of such air transporting arrangements are described in the literature, for instance in the international patent application PCT/SE85/00538. Such air transporting arrangements can be used solely to transport air, i.e. instead of using a fan or like device for this purpose, or can also be used in systems intended for further treatment of the transported air, such as air cleaning systems, air cooling systems, air heating systems or like air processing systems.
One particular problem encountered with the use of such corona discharge generating arrangements in spaces or locations in which people are to be found, for example, in living accommodations or working accommodations, and also in ventilation systems or air treatment systems which communicate with such spaces or locations, is that the corona discharge will generate chemical compounds, primarily ozone and oxides of nitrogen which are liable to produce an irritating effect and which may even be harmful to people when the concentration of such compounds in air is excessively high. The generation of such irritants in conjunction with a corona discharge takes place at a rate which is contingent on the magnitude of the electrical corona current, and the generation of irritants is much greater in the case of a negative corona discharge than in the case of a positive corona discharge. Consequently, a positive corona discharge has almost always been used in corona discharge arrangements that are located in human environments. The problem of irritant generation also exists, however, when a positive corona discharge is used, and consequently the corona current must be restricted in relation to the quantity of air which passes through the corona discharge arrangement per unit of time, so as to limit the concentration of irritants in said air quantity to acceptable values. The corona current needs to be particularly limited when the arrangement is such that the same air repeatedly passes through the corona arrangement, so that irritants are continuously accumulated in the air. In the case of air transporting arrangements which work with ion-winds, such radical limitation of the corona current renders it difficult in practice to transport sufficiently large quantities of air. The necessity of operating with positive corona discharges has excluded the use of pointed or needle-like corona electrodes, which would otherwise be advantageous both from an electro-technical aspect and a mechanical aspect. When using pointed corona electrodes, or needle-like corona electrodes, and a positive corona discharge, so-called streamers, i.e. elongated, thread-like corona discharge channels, occur readily

REFERENCES:
patent: 3184901 (1959-12-01), Main
patent: 4164901 (1979-08-01), Everett
patent: 4955991 (1990-09-01), Torok et al.
patent: 4976752 (1990-12-01), Torok et al.

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