Systems for air-borne cleaning of surfaces

Abstract

There is provided a system and method of cleaning surfaces of an interior cabin space of a contamination comprising a microbial and viral load. The method includes the steps of sealing the interior cabin space and placing water, and a solid or gel pack, into a container and generating a vortex the container by rotating an impeller. The agitation causes the solid or gel pack to release a gaseous cleaning agent. An air-borne spray exiting from the container spreads throughout the interior cabin space to coat the surfaces to be cleaned within the interior cabin space. The cabin is maintained closed for an effective time period while the coating from the air-borne spray dwells on the surfaces to eliminate or substantially reduce the load of the contamination.

Claims

1. A method for cleaning a cabin interior of a car, truck, SUV or tractor-trailer rig of a microbial or viral contamination, the system comprising: sealing the cabin of a car, truck, SUV or tractor-trailer rig from the outside environment and starting an air recirculation system of the cabin; placing a portable apparatus inside the sealed cabin interior, the apparatus comprising: a container having therein water with a solid or a gel pak that releases a gaseous cleaning agent upward and out of the container; and maintaining the cabin closed while allowing the gaseous cleaning agent to dwell for an effective time in the sealed cabin interior to reduce a microbial and viral load on interior surfaces within the sealed cabin.

2. The method of claim 1, wherein the apparatus is sized to fit inside a cup-holder inside the cabin.

3. The method of claim 1, wherein the apparatus includes a detector and indicator to indicate when a concentration of the gaseous cleaning agent has reduced to a safe level.

4. The method of claim 1, wherein the apparatus includes a motor and a step of activating the motor of the apparatus is carried out remotely.

5. The method of claim 1, wherein the effective time is in the range from about 10 to about 30 minutes.

6. The method of claim 1, wherein the effective time to reduce a microbial and viral load on interior surfaces further includes removing odors from the cabin interior.

7. The method of claim 1, wherein cabin is maintained closed for up to about 8 hours.

8. The method of claim 1, wherein the container includes therein an impeller driven by a motor.

9. A method for cleaning a cabin interior of a car, truck, SUV or tractor-trailer rig of a microbial or viral contamination, the system comprising: sealing the cabin of a car, truck, SUV or tractor-trailer rig from the outside environment and starting an air recirculation system of the cabin; placing a portable apparatus inside the sealed cabin interior, the apparatus comprising: a container having therein water with a solid or a gel pak that releases a gaseous cleaning agent comprising chlorine dioxide upward and out of the container; and maintaining the cabin closed while allowing the gaseous cleaning agent to dwell for an effective time in the sealed cabin interior to reduce a microbial and viral load on interior surfaces within the sealed cabin.

10. The method of claim 9, wherein the apparatus is sized to fit inside a cup-holder inside the cabin.

11. The method of claim 9, wherein the apparatus includes a detector and indicator to indicate when a concentration of the gaseous cleaning agent has reduced to a safe level.

12. The method of claim 9, wherein the apparatus includes a motor and a step of activating the motor of the apparatus is carried out remotely.

13. The method of claim 9, wherein the effective time is in the range from about 10 to about 30 minutes.

14. The method of claim 9, wherein the container includes therein an impeller driven by a motor.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The foregoing aspects and many of the attendant advantages, of the present technology will become more readily appreciated by reference to the following Detailed Description, when taken in conjunction with the accompanying simplified drawings of exemplary embodiments. The drawings, briefly described here below, are not to scale, are presented for ease of explanation and do not limit the scope of the inventions recited in the accompanying patent claims.

(2) FIG. 1 is a schematic flow diagram of an exemplary embodiment illustrating some of the steps of the method of cleaning contaminated surfaces in an enclosed space.

(3) FIG. 2A is an exemplary embodiment of an apparatus showing the generation of a gaseous cleaning agent from its container.

(4) FIG. 2B is an exemplary cutaway illustration of a vehicle showing the exemplary embodiment of the apparatus of FIG. 2A emitting an air-borne gaseous cleaning agent throughout the cabin.

(5) FIG. 3A is a schematic illustration of an exemplary embodiment of an apparatus useful in the methods and systems for cleaning contaminated surfaces in an enclosed space.

(6) FIG. 3B is an exploded view showing components of the apparatus of FIG. 3A.

(7) FIGS. 4A and B depict alternative views of another exemplary lid for an exemplary apparatus like that of FIGS. 3A and B.

DETAILED DESCRIPTION

(8) In The following non-limiting detailed descriptions of examples of embodiments of the inventions may refer to appended Figure drawings and are not limited to the drawings, which are merely presented for enhancing explanations of features of the technology. In addition, the detailed descriptions may refer to particular terms of art, some of which are defined herein, as appropriate and necessary for clarity.

(9) The term cabin as used in the specification and claims refer to a space containing contaminated surfaces that can readily be enclosed, for example by closing doors, windows and air vent system, if any, of the space such that air inside the space is neither withdrawn nor added to. The air may be allowed to re-circulate in the cabin however, by activation of an air circulation system, for example, or use of a fan in the cabin.

(10) The term coating or coat as is used in reference to a gaseous cleaning agent on surfaces, means that the gaseous agent dwells on the surface and may be carrying entrained fine water droplets that form a mist containing dissolved gaseous cleaning agent so that the air-borne mist coats and thereby cleans the surfaces, including fine surface textures, surface patterns, and tight interstitial spaces such as found, for example, in stitched seats and dash boards, etc. in vehicles.

(11) The terms contamination or contamination load when used in reference to surfaces within a cabin means microbial, fungal, or viral contamination and also includes contaminants that cause a malodorous scent, for example, of decayed organic matter, fecal matter, and the like.

(12) The term effective period of time as it relates to the time that the cleaning agent dwells in a cabin for cleaning of surfaces therein, the effective period may vary from about 10 to about 30 minutes; and in particular may be from about 15 to about 20 minutes. More or less time may also be effective, depending upon the degree of cleaning (extent of contaminant load reduction) to be achieved and the nature of the chemical cleaning agent used. For example, some cabin spaces may have surfaces so heavily contaminated as to require more than one treatment, or to require that the gaseous cleaning agent dwell on surfaces for up to 8 hours, or overnight, to achieve a desired level of cleanliness and deodorization.

(13) The term significant reduction in contamination load means that the contamination load of a particular contaminating species is reduced by at least 80% after cleaning in exemplary embodiments, or in some exemplary embodiments at least 98% after cleaning.

(14) Referring to FIG. 1, an exemplary flowchart, there are several straightforward steps in the system or method depicted. Once the process starts at block 110, the cabin with contaminated surfaces inside to be treated is closed at block 120. For example, in a used car such as exemplified in FIG. 2 as 180, all doors, windows and the air circulation system, are closed off. Thus, air does not enter or leave the cabin except for natural flow around seals of doors and windows, which may occur in a closed cabin. A door is opened, and an apparatus (explained later with reference to FIGS. 3A and B, and 4A and B) containing liquid with a chemical in solid or gel pack form is placed in the cabin at block 130, and the cabin is closed. (Note that step 120 may take place after step 130; the order is not important). After a few minutes, the chemical in the closed apparatus generates a gaseous cleaning agent and the water becomes slightly cloudy as a result. At this stage the motor of the apparatus is activated in block 140. A nozzle of the apparatus is open, if it was not open already, and the nozzle is sized such that flow of gaseous agent through the nozzle erupts upward, as lava from a volcano, and flows throughout the cabin interior, as shown in FIG. 2B by arrows 205. The nozzle, as explained below, has internal structures, like baffles, that remove entrained large liquid droplets from the gaseous cleaning agent stream as it exits from the apparatus. It is theorized, without being bound, that smaller fine droplets are entrained and assist in the coating and permeation of surfaces with the gaseous cleaning agent. As with any chemical cleaning agent, the agent should be allowed to dwell on the surfaces for a period of time effective for a significant reduction in the contamination load, as in block 150. Optionally, during this period of waiting (block 150), the vehicle being treated (block 160) may activate the air circulation system, in recirculation mode. this would allow the cleaning agent to enter the ducting and filters that form part of the air circulation system and clean these of potential allergens, microbes, viruses and fungi, as well. After an effective period of time has elapsed, and entry into the cabin is deemed safe, the cabin can be opened in block 170, and the cleaning process is complete.

(15) An exemplary embodiment of an apparatus useful in carrying out the systems and methods of the invention is illustrated in FIGS. 3A, 3B and 4A and 4B. As shown, the apparatus 200 has a container 210, with sides that are gently convex-curved, and that has a base 220 at one end and a lid 250 at the other end. The container 210 has a diameter 212 at its upper end that is larger than its diameter 214 near its base 220. The base 220 contains a motor driven by either a battery pack (rechargeable or not) inside the base, or by electrical connection to an electrical outlet. A spindle 226 is seated on an engaging wheel 224 that engages with motor spindle 222 and rotates in unison with motor spindle 222. An impeller 230 has a cavity 232 that friction fits to the spindle 226 so that the impeller 230 rotates as the spindle 226 rotates. The impeller in the exemplary embodiment shown has a double horse-shoe shape with one horse shoe 234 curved downward, and the other 236 curved upward so that the two are conjoined in a common plane at their respective apexes of curvature. This design facilitates creation of a vortex shape when liquid in container 210 is agitated by the rotating impeller in the container at speed. A protective cover 228 shields the motor from contents of the container 210, and fits around the spindle 226, which projects out axially through a hole in the center of the cover. The spindle is appropriately sealed against the hole to avoid or minimize leakage into a space under the cover 228.

(16) Referring more particularly to FIGS. 4A and B, an alternative illustrated exemplary embodiment of the lid 250 can be either friction fit to the upper end of the container 210 by engaging an upper lip of the container, or can be screwed onto the container 210 by threading 260 on the lower end 262 of lid 250 that engages corresponding threading on the container upper lip (not shown). The lid 250 has a top 252 that has a nozzle 254, equipped with a nozzle closing tab 256, extending from it. Referring briefly to FIG. 2A, when in use, the exemplary container 210 is partially filled with water 272, and a solid 275 or a gel pack 275 that releases the gaseous cleaning agent when in contact with water, is placed in the water container. The cleaning gas begins to evolve more quickly when the motor is activated; gas evolution accelerates due to agitation from rotating impeller 230, as shown by arrow 235, which causes the water to form a vortex in the container 210, as shown. Once sufficient gaseous agent has evolved, the gaseous cleaning agent erupts upward out through the nozzle as an air-borne spray to fill the cabin space and commence cleaning surfaces. Thus, the nozzle 254 has an inner diameter 255 shown in FIG. 4A that is sized to cause gaseous cleaning agent emissions from the container through the nozzle at a speed such that the emissions have both velocity and momentum to cause an air-borne spray that travels throughout the desired region of the cabin space to be cleaned. For example, the air-borne spray velocity is sufficient to travel through the cabin of a car. In other embodiments, such as for a large SUV or a cabin of a tractor trailer rig, more than one apparatus may be needed to achieve total cabin permeation by the air-borne spray. To avoid emitting foam and/or large droplets from the container, the lid includes a baffle 264, exemplified by a cart-wheel structure with spaces between the spokes covered with a fine mesh material 266, in its base area. In addition, the nozzle may include a further baffle 258, at its base, that includes perforations for flow of the gaseous cleaning agent.

(17) While the gaseous cleaning agent has been described as chlorine dioxide, other similar gaseous agents may also be useful. In addition, odorizers may be added to impart a pleasant smell to the interior of the cleaned cabin, or to mask any chemical smell.

(18) While examples of embodiments of the technology have been presented and described in text and some examples also by way of illustration, it will be appreciated that various changes and modifications may be made in the described technology without departing from the scope of the inventions, which are set forth in and only limited by the scope of the appended patent claims, as properly interpreted and construed.