US 3576593 A
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Description (OCR text may contain errors)
April 27, 1971 Filed A ril 28, 1969 D. J. CICIRELLO ENVIRONMENTAL AIR SANITIZER 2 Sheets-Sheet 1 OFF HI FIG. 3
INVENTOR. Dame\ 3. Cncarello April 27, 1971 D J, ||RELLO I 3,576,593
I ENVIRONMENTAL AIR smmzmz I Filed April 28, 1969 v 2 Sheets-Sheet 2 INVENTOR. Danld 3 CICU'QH-O 3,576,593 ENVIRONMENTAL AIR SANITIZER Daniel J. Cicirello, 6406 Tracy St., Little Rock, Ark. 72206 Filed Apr. 28, 1969, Ser. No. 819,905 Int. Cl. A611 9/00, 9/04 U.S. CI. 21-53 9 Claims ABSTRACT OF THE DISCLOSURE An apparatus for selectively treating environmental air as it is circulated over a path including an elongate enclosure in which are disposed facilities effective for withdrawing air from a room through a mechanical filter, dividing the air taken in into two discrete paths, chemically treating the air in one path by adding a vapor phase additive, optically treating the air in the other path first with germicidal ultraviolet radiation followed by ozonizing ultraviolet radiation, turbulently mixing the germicidally irradiated air with the ozonized air, and finally blending the additive treated air with the optically treated air and returning the blended air to the room.
PRIOR ART Air treating apparatus utilizing ultraviolet radiation and chemical treatment of a moving column of air for destroying viable microorganisms in the air, to which this invention relates, have been the subjects of a large number of prior art disclosures. Despite this situation, there appears to be no suggestion of any structure capable of the multiple selectively available treatments made possible by the invention herein, or any concept of the treatment sequence provided.
BACKGROUND OF THE INVENTION An important but seldom mentioned consideration con cerning any air treatment apparatus which contemplates a chemical or vapor phase additive treatment superimposed upon an ultraviolet radiation treatment is the ability to adjust the intensity of the respective treatments and thereby conform the treatment to the requirements as they may vary from time to time.
It is an object of the present invention to provide an apparatus enabling the application at variably adjustable rates of a plurality of treatments to the air in the room with the apparatus; such treatments may include, as desired, simple mechanical filtering, insecticidal, germicidal, ozonizing, ionizing or deodorant, and may comprehend chemical or ultraviolet optical, or any one of several combinations of each.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an elevational view of the apparatus, shown with the door removed and partly in section;
FIG. 2 is a side elevation, shown with a side wall removed and partly in section;
FIG. 3 is a front elevation, showing the manually operable controls;
FIG. 4 is an isometric view of the blower module, showing particularly the bottom supporting and connecting rails;
FIG. 5 is a similar view, showing the air inlet and outlet along with the top of the module; and
FIG. 6 is a wiring diagram showing the control connections.
DESCRIPTION OF THE PREFERRED EMBODIMENT Referring in more detail to FIGS. 1, 2 and 3 of the drawings, an upstanding rectangular enclosure or hous- United States Patent O "ice ing 10, formed from a metal sheet having a substantial reflectance of ultraviolet energy at a wavelength of about 2500 angstroms, e.g. brightened aluminum, is provided with a rear door closure 11, which is swingable between an open and a closed position about its pivotal mounting 14 at the lower end of the housing, and which is effective to prevent escape of ultraviolet energy from the housing when in the closed position illustrated in FIG. 3.
A group of upwardly directed louvers 13 provide an outlet for air moving upwardly through the enclosure, and an inlet opening 15 provides for the entry of ambient air. An air filter 16 extends over the opening 15 to filter all air entering the housing, being removably mounted on the enclosure by the bolts 17, which also serve to support the metal filter cover plate 18, the latter being disposed in outward spaced parallel relationship with the filter and the front wall of the enclosure.
A blower module 12, also shown in FIGS. 4 and 5, is disposed in the lower portion of the housing 10, with its inlet opening 19 facing and adjacent to the air filter 16, and its outlet opening 20 directed upwardly through a portion of the top of the module and into the enclosure. An electric motor 21 is mounted on the vertical wall of the module opposite the inlet opening 15 of the enclosure, and drives the fan 22 to move air from the outside through the filter and thence longitudinally upward through the enclosure, as indicated by the directional arrows in the drawing.
To facilitate installation and removal of the blower module 12, its bottom portion 23 is formed of an insulating material; e.g. fiber glass, and the leads 50 to the motor are connected to the transversely spaced conducting rails 24 and 25, the latter normally resting on and being thereby electrically connected respectively to the insulated stationary conducting supporting rails 26 and 27 of the enclosure. The latter are in turn provided with connections to the attachment cord 28, to enable energizing the apparatus. In accordance with common practice, one conductor of the attachment cord operates at ground potential, along with the engaged rails 24 and 26, and the metal Walls of the enclosure.
The construction just described enables the blower module to be removed from the enclosure by simply opening the door 11 and lifting the module out.
For best results in connection with certain of the available air treatment processes possible, provision is made to vary the speed of the blower motor 21. This is accomplished by the connection of the motor to one of the several taps of the multi-tap series choke coil 29 by means of the rotary switch 30, as indicated in FIG. 6. As shown in FIG. 3, the switch 30 is accessible at the lower front panel of the enclosure.
Within the enclosure 10 are disposed several facilities for treating the filtered air as it moves upward from the blower module 12: 1) by adding selected vapor phase additives for insecticidal, germicidal or deodorant effects; (2) by the addition of ozone produced by absorption of ultraviolet radiant energy of a wavelength at the mercury line of 1849 angstroms; and (3) by the germicidal ultra-violet radiation of the wavelength at the mercury line of 2537 angstroms.
Controls for these facilities are mounted on the front panel 43 of the enclosure, enabling the individual use and rate of application of any one facility, or the concurrent use of any desired combination of treatments, at individually variable rates of application. FIG. 6 is the control wiring diagram.
For air treatment by vaporized additives, the additive 31 to be vaporized for addition to the auxiliary air column, and which may be either a solid or a liquid, is placed in the sealed container 32, the latter being conveniently formed of a transparent plastic material and resting on the shelf 40. A tubular additive inlet air duct 33 extends upwardly through the top of the container from an elevation above the surface of the additive, and thence laterally and downwardly to an elevation near and in the path of movement of air from the blower out let opening 20. In somewhat similar fashion, the tubular additive outlet air duct extends upwardly through the top of the container 32 from an elevation above the surface of the additive, its upper end terminal portion 35 resting on the upper surface of the shelf 37 and having in the terminal portion a plurality of upwardly directed perforations 36. A throttle valve, indicated symbolically at the numeral 38, enables adjustment in the volume of additively treated air discharged from the outlet duct.
For the destruction of viable particulates passing through the filter '16 and the blower module 12, the tubular ultraviolet germicidal lamp 42 is supported from the inner side of the front wall of the housing, extending outwardly therefrom and coextensively with the main path over which air is directed as it is blown upwardly from the blower module 12. The wavelength of the radiant energy from the germicidal lamp is preferably about 2500 angstroms, to provide maximum germicidal effectiveness and minimum production of ozone from this source.
For air treatment by the conversion of atmospheric oxygen to ozonized oxygen, a group of bulb-type ultraviolet ozonizing lamp sources 39, radiating energy at wavelengths somewhat less than about 1800 angstroms, are mounted below the shelf member 37, and in position to ozonize a portion of the oxygen of the sterilized air moving upwardly through the housing. The shelf 37 is spaced inwardly from the rear door 11, and laterally from the sides of the enclosure 10, and after passing the lamps 39, the ozonized air moves along the lower surface of the shelf 37 and thence through the upper plenum chamber 41 to the outwardly and upwardly directed louvers 13.
The underside of the shelf 37 is preferably formed from a polished aluminum having a high reflectance, while its upper surface is preferably coated with some low refiectance material. The shelf 37 is disposed: to partition the upper portion of the housing to provide the plenum chamber 41; to prevent escape of ultraviolet radiation through the louvers 13; to preclude deposition of additive material on the lamps; if desired, to provide an electrically grounded metallic surface adjacent to the ozonizing lamps from which photo-electron emission may occur and, finally, to provide a turbulent mixing baflle for admixing the optically treated air en route to the plenum chamber.
To preclude eye damage from radiation, the normally; open door-actuated switch prevents energlzmg any or the ultraviolet sources unless the door is closed. The door being closed, the ozone producing lamps may be energized by closing the switch 45, this action also energizing the pilot light 46. Similarly, the germicidal lamp 42 may be energized by closing the switch 47, which also energizes the indicating light 48. The quantity of additive introduced into the circulated air may be controlled either by adjusting the speed of the blower or by adjusting the position of the throttle valve 38 by moving the operating handle 49.
Procedures for treating room air with an insecticide, a deodorizing ozone and germicidal radiation may be concurrently carried on. Or, if desired, any liquid or solid deodorant or germicidal material which can be evaporated or sublimed by an impinging air current may be injected as an additive into the room air.
An advantageous sequence of air treatment from intake to outlet occurs with concurrent operation of the available treatment processes. All of the air to be treated is first filtered to preclude deposition of filterable air borne particulates on the lamps. For effective sterilization, a relatively long path of travel for the main air column is provided. For minimum degradation of the ozone content of the air during its travel to the outlet, a
relatively short path is provided from the ozonizing lamps and the associated photoelectronically emissive surface of the mixing baffle and shelf 37. The continuous isolation during treatment of the auxiliary air component effectively avoids contamination of the lamps as well as the associated reflective surfaces, and its mixture with the optically treated component at the room outlet assures the retention of the desired qualities of each component as the air moves into the room.
1. A room air treating apparatus comprising an enclosure having an air inlet and an air outlet, blower means effective to impart movement of environmental air along a main path from said inlet to said outlet, and a source of ultraviolet radiation mounted inside the enclosure and disposed to irradiate the air moving along said main path, further comprising an auxiliary means for injecting a vapor phase additive into the irradiated air adjacent to the outlet end of said main path, said auxiliary means comprising an auxiliary tubular air duct coextensive with said main path and having an auxiliary inlet end portion and an auxiliary outlet end portion, means supporting the upstream end of said auxiliary inlet end portion in said main path adjacent to said blower means to thereby receive a portion of the air moved thereby, means supporting the downstream end if said auxiliary outlet end portion adjacent to the outlet end of said main path, an additive container interposed in said auxiliary air duct and a vaporizable additive partially filling said container, the downstream end of said auxiliary inlet end portion and the upstream end of said auxiliary outlet end portion being disposed in communication with the unfilled space above the upper surface of said vaporizable additive.
2. The apparatus as claimed in claim 1, including a serially related throttle valve in said auxiliary air duct.
3. The apparatus as defined in claim 1, wherein a removable cover is fitted on the additive container, and the respective downstream and upstream ends of the auxiliary inlet and outlet end portions are directed downwardly through said cover and terminated at an elevation above the surface of the contained additive.
4. A room air treating apparatus comprising an upstanding enclosure having an air inlet opening adjacent to its lower end and an air outlet opening adjacent to its upper end, blower means effective to move environmental air within said enclosure and along a path extending from said inlet opening to said outlet opening, a source of germicidal radiation and a source of air-ozonizing ultraviolet radiation mounted inside the enclosure in position to irradiate the air in said path from both sources, said sources being spaced along said path to sequentially irradiate air moving therealong in the order the sources are named, a planar transversely extending shelf member fixedly mounted on the Wall of said enclosure at an elevation between the air outlet opening and the radiation sources, said shelf member being formed of a material opaque to ultraviolet radiation and providing a barrier to the movement of radiant energy through said outlet opening, the area of said shelf member being less than the cross sectional area of the enclosure and constituting the floor of a plenum chamber positioned at the upper end of said enclosure, the underside of said shelf member having a high reflectance of ultraviolet radiant energy and being disposed to turbulently intermingle the germicidally radiated air with the ozonized air by impingement on the underside of the shelf as the air is blown therealong en route toward said outlet opening.
5. The apparatus according to claim 4, wherein an auxiliary air duct, open at its respective ends, is supported within said enclosure and extends in isolated relationship along the main path from its lower end near said blower means to an upper terminal portion which extends into said plenum chamber and transversely along the upper surface of said shelf member, and means responsive to the movement of auxiliary air upwardly through said auxiliary air duct for adding a vapor phase additive to said auxiliary air prior to the discharge of the admixed auxiliary air into said plenum chamber for blending with the concurrently moving ultraviolet irradiated air from the main path.
6. In an environmental air sanitizer comprising an upstanding enclosure of rectangular cross section having an air inlet adjacent to its lower end and an air outlet adjacent to its upper end, a source of ultraviolet radiation mounted inside the enclosure and disposed to irradiate air moving along said source from said inlet to said outlet, and blower means including an electric motor and a fan driven thereby for withdrawing air from an associated room and imparting movement of the withdrawn air from said inlet to said outlet, the improvement which comprises housing said motor and fan in a slidably removable rectangular module having an air inlet opening in one vertical side of said module and an air outlet opening in the top of said module, and common means for supporting said module in the lower end portion of said enclosure and connecting said motor to an associated attachment cord, said common means including a pair of insulated, transversely spaced and inwardly directed module rails of conducting material forming parts of and movable with said module, and a pair of insulated and similarly spaced and directed enclosure rails of conducting material forming parts of said enclosure upon which said module rests in registration therewith, and means connecting said enclosure rails to said attachment cord.
7. The method of treating atmospheric air moving along an enclosed main path which has an untreated segment at the upstream end of the path and an ultraviolet irradiated segment downstream therefrom comprising the steps of removing an air fraction from the upstream end of the path, moving the removed air along an auxiliary path isolated from the main path, chemically treating the removed air during its passage along said auxiliary path, and discharging the chemically treated air into the downstream end of the main path. a
8. The method recited in claim 7, wherein the irradiate air is subjected to ultraviolet radiant energy at the wavelength of 25 37 angstroms.
9. The method recited in claim 7, wherein the irradiated air is first subjected to ultraviolet radiant energy at the wavelength of 2537 angstroms, and subsequently subjected to ultraviolet radiant energy at the wavelength of 1849 angstroms.
References Cited UNITED STATES PATENTS 2,397,068 2/ 1950 Canney 21-74X 2,523,373 9/1950 Jennings et a1. 21-74 2,553,711 5/1951 Jackson 21--102X 2,638,644 5/1953 Rauhut 21--53X 2,754,554 7/1956 Mills 21-120 3,047,718 7/1962 Fleming et a1. 2153X 3,071,828 1/1963 Cornell 2174 3,442,602 5/1969 Diehl 2153 FOREIGN PATENTS 349,031 11/ 1960 Switzerland 21102 MORRIS O. WOLK, Examiner B. S. RICHMAN, Assistant Examiner US. Cl. X.R.
2154R, 55, 74R, 74A, 10ZR; 279; 250-48