U.S. patent number 3,910,778 [Application Number 05/401,156] was granted by the patent office on 1975-10-07 for biological filter for the sterilization and enrichment of a gas stream with negative ions.
Invention is credited to Ali Sekhavat, Manouchehr Shahgholi.
United States Patent |
3,910,778 |
Shahgholi , et al. |
October 7, 1975 |
Biological filter for the sterilization and enrichment of a gas
stream with negative ions
Abstract
A biological filter for the sterilization and enrichment of a
gas stream with negative ions, wherein said filter comprises in
combination, on the path of the gas molecules and in the direction
of flow of the gas, a first separating electrode which is brought
to a negative potential, a second extraction electrode which is
brought to a positive potential and entirely covered with electric
insulating material, an ultraviolet lamp for irradiating said gas
stream and a third output electrode which is brought to a negative
potential.
Inventors: |
Shahgholi; Manouchehr (Teheran,
IR), Sekhavat; Ali (Teheran, IR) |
Family
ID: |
9106083 |
Appl.
No.: |
05/401,156 |
Filed: |
September 27, 1973 |
Foreign Application Priority Data
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|
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|
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Oct 23, 1972 [FR] |
|
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72.37540 |
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Current U.S.
Class: |
96/16; 96/224;
422/121 |
Current CPC
Class: |
A61L
9/22 (20130101); H01T 23/00 (20130101) |
Current International
Class: |
A61L
9/22 (20060101); H01T 23/00 (20060101); B03c
003/00 () |
Field of
Search: |
;55/102,279,138,131,155,136,139 ;21/53,54R,55,74R,74A,DIG.2
;250/532,533,538,539,540,541 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Nozick; Bernard
Attorney, Agent or Firm: Cameron, Kerkam, Sutton, Stowell
& Stowell
Claims
What we claim is:
1. A biological filter for the sterilization and enrichment of a
gas stream with negative ions, comprising on the path of the gas
molecules and in the direction of flow of the gas, a first
separating electrode at a negative potential -V, a second
extraction electrode at a positive potential +V and entirely
covered with electric insulating material, an ultraviolet lamp for
irradiating said gas stream, a third output electrode at a negative
potential -V, the three electrodes being conductive metallic grids,
the second electrode being electrically insulated from the gas
stream by a covering of plastic material, the ultraviolet lamp
surrounding the gas stream and the value 2V being between 350 and
400 volts.
Description
This invention relates to a biological filter for the sterilization
and enrichment of a gas stream with negative ions, the filter being
primarily intended to be fitted in ventilation sources in order to
obtain an appreciable increase in the concentration of negative
ions which are present in air with respect to the concentration of
positive ions.
In fact, recent studies carried out by doctors and physiologists
have served to demonstrate the considerable importance of the
presence of negative ions in the atmosphere and more especially of
negative oxygen ions in the case of air since they prove essential
to biological and particularly human equilibrium. It is known at
the present time, for example, that disorders as widely different
in character as asthma, arthrosis, some types of migraines or sick
headaches, cancer and so forth appear much more frequently and more
readily in persons who lead their daily lives in environments which
have a low concentration of negative oxygen ions.
Generally speaking, the surrounding air contains a much higher
proportion of positive ions than negative ions even in the zones in
which the air is of high purity. Unfortunately, the processes of
pollution by waste products discharged into the atmosphere from
industrial sources bring about a considerable reduction in the
number of negative oxygen ions which are present in the air
breathed by human beings; and in some extreme cases such as the
centers of large industrial towns, these negative ions are
completely eliminated. The recent biological studies mentioned
earlier now confirm the major disadvantages which arise from these
conditions.
The precise aim of this invention is to provide a biological filter
for counteracting the disastrous effects of pollution by means of a
surplus of negative ions produced within a flowing gas stream, and
especially an air stream for the ventilation of residential
premises.
Said biological filter for the sterilization and enrichment of a
gas stream with negative ions is essentially characterized in that
it comprises in combination, on the path of the gas molecules and
in the direction of flow of the gas, a first separating electrode
which is brought to a negative potential, a second extraction
electrode which is brought to a positive potential and entirely
covered with electric insulating material, an ultraviolet lamp for
irradiating said gas stream and a third output electrode which is
brought to a negative potential.
In accordance with the invention, the first separating electrode
which is brought to a negative potential with respect to the
surrounding atmosphere carries out a first selection of the ions
naturally contained in the gas stream to be enriched with negative
ions by collecting the majority of the positive ions originally
contained in said stream. The second extraction electrode which is
located behind the first in the direction of flow of the gas stream
is positively charged and, by virtue of the field produced,
consequently constitutes the accelerating electrode for the few
negative ions which will have passed through the first electrode.
In accordance with the invention, said second extraction electrode
is electrically insulated over its entire surface, for example by
means of a covering of plastic material of any suitable type, in
order that said electrode may thus be prevented from collecting the
few negative ions which pass through this latter. The ultraviolet
lamp which is then encountered by the gas stream on its flow path
causes on the one hand bacteriological sterilization and above all
very strong ionization of the neutral molecules of said gas stream
and this latter is thus abundantly seeded with positive and
negative ions. The third output electrode is brought to a negative
potential so that the positive ions produced within the gas stream
by the ultraviolet lamp can be collected as they pass, there being
allowed to remain only the negative ions which are then carried to
the exterior by the gas stream.
The potential differences established between the three electrodes
are not critical per se but an advantageous normal value can be
within the range of 350 to 400 volts, for example, this being
readily obtained by means of a domestic generator which operates
from the mains supply system.
As has been explained earlier, the main advantage of said
biological filter lies in the fact that it provides an effective
means of combating air pollution and the resultant destructive
action on the negative ions of oxygen which are essential for
maintaining life in all its forms. The present invention
accordingly finds a wide variety of applications in numerous fields
such as science, agronomy, zoology, space technology, medicine,
easthetics, food science and so forth. One immediate and very
important application of the biological filter in accordance with
the invention consists in inserting said filter in the outlet
shutter of an air conditioning ventilator of the type employed for
comfort control.
A better understanding of the invention will in any case be gained
from a perusal of the following description which relates to one
example of application of the biological filter according to the
present invention, reference being made to the diagrammatic FIGS. 1
to 3 of the accompanying drawings, in which:
FIG. 1 is an exploded view of a biological filter in accordance
with the invention;
FIG. 2 is a sectional view of one form of construction of the
filter of FIG. 1, said filter being engaged within a flat metal
casing;
FIG. 3 shows the application of the biological filter according to
the invention to an apparatus for the production of conditioned
air.
There is shown in FIG. 1 a flat gas stream 1 which flows in the
direction of the arrow F under the action of a ventilator of a type
known per se (not shown), which passes successively through the
first separating electrode 2, the second extraction electrode 3,
the ultraviolet lamp 4 and the third output electrode 5 and is then
finally discharged to the exterior for use by living beings. In
accordance with the invention, the electrodes 2 and 5 are of
conductive metal and of any desired shape although a constructional
design in the form of a grid is wholly suited to the result which
is sought. In the non-limitative embodiment of FIG. 1, the
ultraviolet lamp has the shape of an annular tube within which the
gas stream passes. Also in accordance with the invention, the
second electrode or extraction electrode 3 is wholly covered with
an insulating plastic sheath 6. A direct-current supply source 7 of
a type known per se and comprising the electronic equipment of the
apparatus is adapted to carry the different electrodes 2, 3 and 5
at the desired potentials. In the example of FIG. 1, the electrode
2 is brought by means of the conductor 8 to a negative potential of
- 200 volts; the extraction electrode 3 is brought by the conductor
9 to a positive potential of + 200 volts and the third extraction
electrode 5 is brought by the conductor 10 to a negative potential
of - 200 volts. The supply unit 7 also serves to supply electric
power via the conductors 11 and 12 to the ultraviolet lamp 4.
There is shown diagrammatically in FIG. 1 by means of the signs +
and - the relative proportion of the positive and negative ions
which appear within the gas stream 1 progressively as this latter
passes through the biological filter in accordance with the
invention. Before passing into the apparatus, that is to say before
reaching the electrode 2, the positive ions are distinctly
predominant. Inasmuch as the grid 2 retains the greater part of
said positive ions, the ionization is then much lower and
essentially constituted by negative ions. At the moment of passing
through the ultraviolet flux of the lamp 4, the gas stream is
totally sterilized and again highly ionized, the third output
electrode 5 retains the majority of the positive ions, with the
result that the gas stream 1 is essentially seeded with negative
ions as it leaves said electrode.
The sectional view of FIG. 2 shows the different elements of FIG. 1
in the real relative arrangement in which they are engaged within a
flat casing 13. The electrodes 2, 3 and 5 as well as the
ultraviolet lamp 4 are again shown in this figure. By virtue of
this arrangement, the biological filter in accordance with the
invention is particularly convenient to use since the assembly is
presented in the form of a plate which can thus be readily placed
on the path of a gas stream in order to enrich this latter in
negative ions. This is the case, for example, with the example of
construction of FIG. 3 in which is shown an apparatus 14 of known
type for the production of conditioned air. The outlet shutter 15
of this apparatus has two guides, only one guide 16 being visible
in FIG. 3, the plate 17 containing the elements of the biological
filter of FIG. 2 being slidably engaged within said guides. In this
mode of application of the invention, the conditioned air is
impelled into the enclosure to be thermostatically controlled in a
direction of flow which is indicated by the arrow F'. The flow of
conditioned air through said shutter 15 fitted with the generator
17 is alone sufficient to ensure substantial diffusion of negative
oxygen ions within the thermostatically controlled premises, thus
producing a beneficial action on living beings as already pointed
out in the foregoing.
As is readily apparent, the invention is not limited in any sense
to the different forms of construction which have been described
only by way of indication and extends to all alternative forms
which are within the capacity of any one versed in the art. As has
already been explained earlier, the present invention has a very
broad range of application which is not limited solely to the
production of conditioned air enriched with negative oxygen
ions.
By way of example, one application of particular interest is the
ventilation of automobiles in which a biological filter according
to the invention is placed in the ventilation circuit and thus
provides passengers with the means for readily obtaining an
atmosphere which is biologically pure and rich in negative oxygen
ions.
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