WO2012103006A2

WO2012103006A2 - System for controlling supply of ozone to washing machine to maximize cumulative ct value

Info

Publication number: WO2012103006A2
Application number: PCT/US2012/022212
Authority: WO
Inventors: Ralph G. Daniels; David A. Spofford
Original assignee: Daniels Ralph G; Spofford David A
Priority date: 2011-01-24
Filing date: 2012-01-23
Publication date: 2012-08-02
Also published as: WO2012103006A3; CA2825613C; CA2825613A1

Abstract

A method and system of controlling a concentration of ozone sampled or exhausting from a washing machine to be at or below a target value so that a cumulative contact time of the ozone with laundry approaches a duration of time of an entire wash cycle of the washing machine thereby ensuring killing of any infectious diseases. The method comprising the steps of supplying only ozonated water to the washing machine upon filling the washing machine, supplementing the supplied ozonated water by supplying additional ozone to the wash machine during each wash cycle, and controlling the supply of ozone supplied to the wash machine so that the concentration of ozone sampled or exhausting from the washing machine is controlled to be within a control band between 60% and 100% of the target value and the cumulative contact time of the ozone with the laundry is at least 60% of the duration of time of the entire wash cycle.

Description

[001] SYSTEM FOR CONTROLLING SUPPLY OF OZONE TO WASH I NG

MACHINE TO MAXIMIZE CUMULATIVE CT VALUE

[002] FIELD OF THE INVENTION

[003] The present invention relates to a method and a system for controlling the supply of ozone washing machine water which maximizes the use of ozone in order to throughly and completely clean, sanitize and/or disinfect the laundry being washed in the shortest time possible.

[004] BACKGROUND OF THE INVENTION

[005] The use of ozone in cleaning and sanitizing laundry has been utilized for quite some time. The primary reason is that ozone is generally recognized as being effective in cleaning as well as deodorizing and sanitizing laundry while minimizing impact to the environment. With respect to commercial applications, however, ozone is generally the preferred cleaning component as it is relatively inexpensive to manufacture and quite reliable.

[006] As is well known, the application of ozone to a cleaning fluid, such as water, acts as a disinfectant as well as assists with removing dirt, debris and other contaminants from the laundry detergent so that the laundry detergent can again be effective in removing dirt, debris and other contaminants from the clothing or other laundry being laundered. While it is known that dissolving ozone in a liquid, such as water, will assist with improving the cleaning and sterilization efficiency of the liquid, a number of the currently available prior art systems suffer a variety of associated drawbacks. In particular, a portion of the ozone which is added to the liquid does not become completely dissolved within the water so that it can not readily directly contact any substance(s) dissolved or contained within the liquid. As a result, the undissolved ozone is rapidly given off, dissipated and/or evaporated from the liquid as soon as the liquid enters into a reservoir or some other expansion chamber, for example. As a result, such undissolved ozone is not effective cleaning and/or disinfecting and thus not all of the ozone, which is added to the liquid or water, is active or effective in achieving the desired cleaning and/or sterilization intended by the ozonated liquid. Further, many times, some of the replacement liquid or water, which is added to the washing machine during the wash cycles, does not contain any ozone and such unozonated liquid generally increases the duration of the cleaning, sanitization and/or disinfection time for the laundry being washed.

[007] It is to appreciated that washing laundry can be a relatively expensive process. It utilizes costly resources-water, energy, detergents and labor-and such laundering is often required not only to clean but disinfect the laundry items. While conventional detergents and soap can be effective in removing dirt, grease, grime and other contaminants, they are not always effective in killing germs and bacteria. It is known to enhance the disinfection capabilities of a washing machine by introducing ozone into the washing water. The ozone improves cleaning of laundry, even at relatively low or cold wash water temperatures, and also has an antibacterial effect.

[008] Previous systems for introducing ozone have included a simple bubble system in which ozone is bubbled through water in a washing machine drum. The efficiency of dissolving ozone in the water of such apparatus is low, and the concentration of dissolved ozone in the water is consequently low thereby resulting in only a minor enhancement in the cleaning and the antibacterial effect of the ozone. There is also the disadvantage that the amount of off-gas, i.e., the ozone which is readily given off to the surrounding environment both during filling and/or during operation of the washing machine, can be considerable. The ozone gas will typically collect in the area surrounding one or more sampling ports or exhaust vents of the washing machine and can potentially cause health and/or safety problems in the event that any person located adjacent, or within the room accommodating the washing machine, is exposed to a high concentration of ozone.

[009] In order to improve the efficiency with which ozone is dissolved in the water, systems using Venturis have been developed. Such systems attempt to forcibly dissolve ozone in the water and thereby increase the concentration of dissolved ozone (see the results of such a system depicted by Fig. 1 ) as a fresh water is added to the washing machine. However, the ozone is generally not completely and thoroughly dissolved within the water, so as to maximize contact of the dissolved ozone during the washing process and the ozone tends to dissolve out of solution fairly rapidly and become gaseous shortly after being mixed with the water and supplied to the washing machine. The CT value for systems, which incorporate a direct injection of ozone into the water, tend to be fairly low, e.g., only achieve a CT value of 0.6 for example.

[010] In an attempt to improve the amount of ozone dissolved within the water,

Daniels Equipment Company developed and manufactures a diffusion system in which the ozone is directly injected into the water contained, typically within a sump of the washing machine during the wash cycle. The results of such system are depicted in Fig. 2 attached hereto. The CT value for such systems, which directly inject ozone into the water contained within the sump, tend to be much higher, e.g., achieved a CT value of 10.0 for example during 20 minute wash. However, as noted below, such CT values are still insufficient to kill some commonly known and prevalent infectious diseases.

[01 1] With respect to commercial applications, during a typical wash cycle, a number of infectious diseases must be reliably and consistently killed in order to prevent the spread of such infectious diseases. That is, in order to ensure reliable and consistent killing of a desired infectious diseases, a cumulative CT value-i.e., the concentration of the disinfectant (i.e., ozone) multiplied by the time that the disinfectant (i.e., ozone) is in contact with the infectious disease(s)-must be achieved between the beginning of the wash cycle and the end of the wash cycle. It must be appreciated from the above that the CT value can vary depending on the concentration level of the ozone as well as the time that the laundry has the ability to come into contact with the dissolved ozone. Correspondingly, in the event that the necessary cumulative CT value is not achieved by the end of the last wash cycle, the operator can not be ensured that any infectious disease(s) contained within the laundry is not effective cleaned and/or sanitized. Table 1 below sets forth an example of common CT values for various infectious diseases. [012] TABLE 1

[013] SUMMARY OF THE INVENTION

[014] It is an object of the present invention is to substantially completely dissolve and/or encapsulate a maximum amount of ozone within the water, used in a washing machine, during the filling phase as well as during each subsequent filling cycle. In addition, the present invention is directed at adding additional ozone to the water, contained within the wash machine during each wash cycle, so as to maintain the amount of dissolved and/or encapsulated ozone at as high a level as possible, i.e., at a target level, without creating a safety risk. That is, the present invention is directed at maximizing the amount of ozone which is dissolved and/or encapsulated in water and also directed at maintaining the ozone dissolved and/or encapsulated within liquid for as long a time period as possible so that the dissolved and/or encapsulated ozone can increase the CT value and the dissolved and/or encapsulated ozone can intimately contact the laundry and facilitate cleaning, sterilization and/or sanitation thereof. [015] A further object of the invention is to fill the washing machine only with ozonated water so as to immediately immerse the laundry within ozonated water and thereby increase the contact time of the ozonated water with the laundry and facilitate a more complete and thorough cleaning, sterilization and/or sanitation of the laundry during a typical wash cycle.

[016] A still further object of the present invention is to maintain the laundry in intimate contact with the ozonated water for as long a duration of time as possible so that laundry is completely and thorough cleaned, sterilized and/or sanitized, during the wash cycle, and thereby reducing the required wash time for a complete and total cleaning, sanitizing and/or sterilizing the washed laundry.

[017] Yet another object of the present invention is to increase the CT value, achieved by the ozone, so as to kill the widest array of infectious diseases over the shortest possible time span at CT values which have not been previously achieved by any prior art washing machines thereby further improving the cleaning, sanitization and/or disinfection of the laundry at the completion of the final wash cycle so as to prevent the spread of any infectious disease(s).

[018] Another object of the present invention is to position a static mixer, immediately following injection of the ozone into the filling water, to assist with a thoroughly and complete mixing and dissolving the ozone within the filling water, prior to the filling water being discharged into the internal drum of the washing machine for washing. Preferably the ozonated water, upon exiting the static mixer, undergoes a dwell time of about three seconds or so prior to the ozonated and pressurized filling water discharging into the washing machine. As soon as the ozonated filling water enters the washing machine, the filling water returns to atmospheric pressure. A dwell time of about three seconds, plus or minus one second, further improves and/or increases the amount of ozone which is dissolved and/or encapsulated within the ozonated water and thereby increases the amount of dissolved ozone within the water so that the ozone concentration level of the filling water approaches about 90%. This greater amount of ozone, which is initially dissolved and/or encapsulated within the filling water, in turn, facilitates a more through cleaning as well as deodorization and/or sanitization of the laundry, during the wash cycle, and also minimizes the amount of ozone which gasses off and exhausts from the washing machine during any wash cycle. In addition, by having a greater amount of ozone dissolved and/or encapsulated within the ozonated water, such greater concentration of dissolved and/or encapsulated ozone further increases the CT value of the ozone with the laundry and this results in a more through cleaning, deodorization and/or sanitization of the laundry being washed.

[019] It is another object of the present invention to provide a system in which the amount of ozone generated, during each wash cycle, is controlled so that an optimum amount of ozone is generated, supplied to and dissolved and/or encapsulated within the wash water, during each one of the separate wash cycles, so that the laundry is constantly subjected to the greater permissible concentration ozone and thereby is efficiently and consistently cleaned over the shortest possible duration of time.

[020] Yet another object of the present invention is to ensure that a sufficient amount of ozone is present during the initial wash cycle, where the ozone can be readily used to "burn off" the dirt, grease, grime and other contaminants as well as kill "super bugs", germs and bacteria (i.e., ozone is effective in killing 99.99% of the super bugs, germs and bacteria contained within the laundry), while the system still has the ability to control, modify, vary, interrupt or reduce the amount of ozone generated during each subsequent wash cycle when less ozone is typically required.

[021] Still another object of the present invention is to provide the system with a sensor which will completely shut off production of ozone, or possible sufficiently reduce the production of ozone, in the event that the ozone being sampled or exhausted from the washing machine indicates that excess ozone, above the target value, is being sampled or exhausted from the washing machine, e.g., the system indicates an ozone level exhausting from the washing machine is greater than a target value of 1.0 (ppm) parts per million or higher, for example. It is to be appreciated that the target value can be readily adjusted to any other generally accepted higher or lower standard or for any particular application. [022] A still further object of the present invention is to attempt to maintain the dissolved and/or encapsulated concentration of ozone within the water as close as possible to the target value so that the laundry is provided with the maximum opportunity to be consistently and constantly in contact with the wash water which has the greatest possible amount of ozone dissolved and/or encapsulated therein. That is, preferably the present invention controls the amount of ozone so as to have an average ozone value which is generally between 50% and 100% of the target ozone value, more preferably the present invention controls the amount of ozone to have an average dissolved and/or encapsulated ozone value which is generally between 60% and 100% of the ozone target value, and most preferably the present invention controls the amount of ozone to have an average dissolved ozone value which is generally between 70% and 00% of the ozone target value.

[023] Another object of the present invention is to provide the system with a fail safe sensor which will completely shut down the production of ozone, or sufficiently reduce production of ozone, in the event that the ozone level, in the room or an area accommodating the washing machine(s), increases above a level which creates a potentially hazardous situation for the health and/or safety of human beings, e.g., the ozone level in a room reaches the target value of 0.1 (ppm) parts per million of ozone, for example.

[024] Another object of the invention is to provide a system for detecting and displaying the CT value during the entire wash cycle of the washing machine and to record and/or display this information to the operator. The CT value detection system includes an ozone exhaust or sampling sensor detector, generally located at an exhaust outlet or sampling port of the washing machine (or at any other desired location which can sense, monitor or detect the concentration of the ozone in washing machine) which periodically senses, measures or detects the concentration of the ozone being sampled or exhausted from the washing machine, e.g., once every 1 second, 5 seconds, 10 seconds, 30 seconds, 1 min., etc. The CT value detection system will continuously compute the detected cumulative CT value, as the wash progresses from the beginning of the first wash cycle until completion of the last wash cycle, and generally indicates either the actually calculated cumulative CT value, via a numeric display, or merely activates a green light, which indicates that a sufficient cumulative CT value has been achieved during the wash, while a red light, which indicates that an insufficient cumulative CT value is achieved, is activated at the beginning of the first wash cycle and remains activated until a sufficient cumulative CT value has been achieved during the wash. Preferably, a room detector is also provided for recording and/or displaying the amount of ozone which is detected within the room, accommodating a plurality of washing machines, so that this information can be later retrieved for possible fine tuning of the control of the ozone system.

[025] A still further object of the present invention is to inject the produced ozone, having a particle size of about 2 microns to 20 microns, and more preferably having a particle size of from about 5 to 10 microns, directly into either the sump of the washing machine, typically located beneath the washing machine, or directly into the water contained within the washing machine along with injecting ozone directly into the fresh water which initially fills the internal drum of the washer machine with ozonated water. By supplying ozonated water initially to the washing machine, the concentration of the ozone, contained therein, is as close as possible to the target ozone level immediately at the beginning of the wash cycle. In addition, by injecting ozonated water into water during continued operation of the washer machine, the ozone content remains as close as possible to the target ozone level during the entire wash, i.e., from the first wash cycle to the last wash cycle.

[026] Another object of the invention is to provide a method and a system in which cumulative contact time (the CT value) approaches the duration of time of the entire wash cycle. That is, the total value of the cumulative contact time (the CT value) approaches or is at least 60% of the total duration of the entire wash cycle. According, if the total duration of the entire wash cycle is 35 minutes, the cumulative contact time (the CT value) is at least 21 which is 60% of the 35 minute total duration of the entire wash cycle. More preferably the cumulative contact time (the CT value) is at least 70% or 80% of the total duration of the entire wash cycle. [027] The present invention relates to a method of controlling a concentration of ozone sampled or exhausting from a washing machine to be at or below a target value so that a cumulative contact time of the ozone with laundry being washed approaches a duration of time of an entire wash cycle of the washing machine thereby ensuring killing of any infectious diseases contained within the laundry, the method comprising the steps of: supplying ozonated water to the washing machine upon initially filling the washing machine with water; supplementing the initially supplied ozonated water by supplying additional ozone to the wash machine during each wash cycle; and controlling the supply of ozone supplied to the wash machine so that the concentration of ozone sampled or exhausting from the washing machine being controlled to be within a band between 60% and 100% of the target value and the cumulative contact time of the ozone with the laundry is at least 60% of the duration of time of the entire wash cycle.

[028] It is to be appreciated that when amount of ozone sampled or exhausting from the washing machine exceeds the target value, this signifies that there is excess ozone within the water and exiting from the washing machine. As there is excess ozone within the water, this excess ozone is quickly and rapidly converted into a gaseous form which exhaust from a washing machine and can quickly result in a hazardous situation. Accordingly, it is immediately desirable to stop production of further ozone as soon as the method and the system detect the concentration of ozone, exiting from the washing machine, exceeding the target value.

[029] As used within the specification and the appended claims, the term "entire wash cycle" means the duration of time from the instance that the washing machine is initially started until the time that the door of the washing machine is open to provide access and remove the laundry.

[030] As used within the specification and the appended claims, the term

"average dissolved ozone value" means the average value of the ozone which is dissolved and/or encapsulated within the water during the entire wash cycle, i.e., commencing from the beginning of the wash cycle until completion of all of the wash cycle and the door is opened to access and remove the laundry. [031] As used within the specification and the appended claims, the term

"modifies production of ozone" means that the production of ozone can be modified, reduced or altered so as to be somewhat lower than the current production level of ozone or can be totally or completely discontinued so that no further ozone is being produced, or a production amount of ozone can be anywhere in between zero and the .

[032] BRIEF DESCRIPTION OF THE DRAWINGS

[033] Preferred embodiments of the present invention will now be described, by way of example only and not in any limitative sense, with reference to the appended drawings in which:

[034] Fig. 1 is a diagrammatic drawing showing a gaseous ozone content level achieved by a prior art direct injection system;

[035] Fig. 2 is a diagrammatic drawing showing a gaseous ozone content level achieved by another prior art system;

[036] Fig. 3 shows the improved system, according to the present invention, for controlling a supply of ozone to a washing machine both during the filling phase as well as during each subsequent wash cycle(s);

[037] Fig. 3A shows a commercial embodiment of the improved system of Fig. 3;

[038] Fig. 4 is an enlarged diagrammatic drawing showing the venturi and static mixed components for intermittently mixing the fresh water with the ozone to provide a substantially uniform mixture thereof which assists with retaining the ozone within the water for a longer duration of time once the ozonated water is supplied to the washing machine;

[039] Fig. 5 shows a modification to the improved system of Fig. 3 having an air drier unit;

[040] Fig. 6 shows injection of the ozone into the sump via the sparger injection nozzles;

[041] Fig. 7 is a table of date data showing a comparison of the gaseous ozone content, achieved by the present invention, in comparison to two prior art ozone systems; [042] Fig. 7A is a graphic representation of the data shown in Fig. 7;

[043] Fig. 8 shows an arrangement having a single area ozone level sensor for controlling production of ozone by a plurality of washing machines; and

[044] Fig. 9 is a diagrammatic arrangement for visually displaying both the currently detected CT value as well as the cumulative CV value during the entire wash cycle so that an operator can readily validate whether the laundry has been sufficiently wash to kill all commonly known infectious diseases.

[045] DETAIL DESCRIPTION OF THE DRAWINGS

[046] With reference now to Figs. 3, 3A and 4, a detailed description concerning the present invention will now be discussed in detail.

[047] According to this embodiment, as is conventional in the art, the ozone system 2 generally comprises a washing machine 4 which, during use, is filled with a suitable volume of liquid or water 6, i.e., a washing volume of water, to facilitate washing of the laundry 8 contained within the washing machine 4. The water is typically supplied from a water supply source 10 to a rotatable internal drum 12, located within an internal chamber 14 of the washing machine 4, via a fresh water supply inlet 16. As is conventional in the art, the washing machine 4 is provide with a hinged door 18, typically located on either the front or the top of the washing machine 4 that generally forms a water tight seal with the door opening of the washing machine 4, in a conventional manner, when the door 18 is latched in a closed position (in Fig. 3 the door is shown in the front of the washing machine 4). The door 18, when in its opened position, facilitates adding and removing laundry 8 from the washing machine 4. As such door and its latching mechanism are conventional and well known in the art, a further detailed discussion concerning the same is not provided.

[048] During the initial as well as any subsequent filling cycle, when washing laundry 8, the filling water flows from the water supply source 10, along a filling water conduit 21 , into an inlet of a venturi 22, such as a venturi manufactured in accordance with U.S. Patent No. 5,863,128. As the water passes through the venturi 22, the water is accelerated, via the centrally located constriction 24 of the venturi 22 (see Fig. 4), and such acceleration of the water induces a vacuum in an ozone supply line 34 that is coupled to the venturi 22 so as to draw in ozone which is supplied from an ozone supply, generally indicated as 29, to the venturi inlet 28 of the venturi 22. Typically the supply pressure of the fresh water flowing through the venturi 22 is between about 40 PSI and about 80 PSI. Both the ozone and the water, as those components exit the centrally located constriction 24, are decelerated and this induces intimate mixing of those two components with one another. In order to achieve a more complete and thorough mixing as well as more complete dissolving and/or encapsulation of the ozone within the water, the water/ozone mixture then passes through a static mixer 32, such as a static mixer manufactured in accordance with U.S. Patent No. 3,923,288 by Ozone Solution of Hull, IA. As the water/ozone mixture passes through the static mixer 32, the static mixer 32 causes the ozone to be intermittently mixed, dispersed and/or dissolved and/or encapsulated within and throughout the water. As a consequence, the static mixer 32 thereby facilitates a more complete and thorough dissolving of the ozone within the water and this generally facilitates a longer retention of the dissolved and/or encapsulated ozone within the water. As the ozone and water mixture exits the static mixer 32, preferably this mixture undergoes a dwell time of about 3 seconds, plus or minus one second. This dwell time further facilitates a more complete and thorough dissolving and/or encapsulation of the ozone within the water. In the event that there is sufficient room to provide a suitable dwell time prior to this ozone/water mixture exiting the fresh water supply inlet 16, a U-shaped (see Fig. 4), a helical shaped segment, or some other suitable segment of conduit or piping can be inserted along the supply line 21 of the ozonated water to facility the desired dwell time of the ozone/water mixture prior to the ozonated water entering and discharging into washing machine. A water supply valve 26, which controls the flow of filling water into the washing machine 4, is generally located downstream of the static mixer 32.

The ozone supply 29 includes a filling ozone generator 30 which is connected to the venturi inlet 28 of the venturi 22 via the ozone supply line 34 for supplying ozone thereto. Typically, the ozone generator 30 will constantly and continuously produce ozone during the entire operating cycle of the washing machine 4 and such produced ozone is normally retained within the ozone generator 30 and only withdrawn therefrom when necessary or required, e.g., as water flows through the venturi 22 and sucks or draws the ozone from the ozone generator 30. That is, as the water is flows through the venturi 22, the water induces a vacuum at the venturi inlet 28 of the venturi 22 and such vacuum, in turn, sucks or draws a desired quantity of the produced ozone, along the ozone supply line 34, from the ozone generator 30 into the water. The ozone generator 30 is electrically connected to the control panel CP, as described below in further detail, to facilitate both control and operation of all the ozone generator as well as facilitate interruption of the ozone when a hazardous condition arises.

[050] Preferably, a conventional air supply device/oxygen concentrator 36 compresses room air to a pressure of about 5 pounds per square inch or so and supplies this pressurized room air, via a conventional supply duct or pipe 38, to an air flow control valve 40 which regulates the flow rate of the air being supplied to filling ozone generator 30. The air supply device/oxygen concentrator 36, during normal compression of the air, typically removes nitrogen from the air and thereby naturally increases the overall oxygen content of the air which, in turn, facilitates subsequent production of ozone. The air supply device/oxygen concentrator 36 also typically removes water, moisture and other impurities from the air prior to supplying the same to the filling air flow control valve 40.

[051] The air flow control valve 40 is connected, via a conventional supply duct or pipe 41 , to supply the pressurized and regulated air to an inlet of the filling ozone generator 30 where a portion of such air, e.g., typically about 5% of the supplied air, is converted into ozone in a conventional fashion. As such conversion of air into ozone is conventional and well known in the art, a further detailed discussion concerning the same is not provided. As noted above, the outlet of the filling ozone generator 30 is connected, via the supply duct or pipe 34, to the venturi inlet 28 for supplying the generated ozone, as necessary, thereto.

[052] As long as the ozone/water mixture is being supplied along the supply line

21 , this ozone/water mixture remains at the supply pressure of the filling water, and thus the ozone continues to mix intimately and dissolve and/or encapsulate within the water and thereby achieve a greater concentration of dissolved and/or encapsulated ozone within the water. The inventors have determined that the static mixer 32 enhances the dissolved and/or encapsulated rate of the ozone within the water by as much as an additional 20% or so. This increased amount of dissolved and/or encapsulated ozone within the water, in turn, facilitates longer contact time between the ozone and the laundry and thus a more thorough and complete cleaning, sterilization and/or sanitization of the laundry 8 being washed.

[053] As will be described below in further detail, commercial washer will typically include up to and including 8 separate wash cycles, but it is to be appreciated the amount of wash cycles can vary from washing machine to washing machine or application to application. During each one of the wash cycles, a portion of the water contained within the internal drum 12 of the washing machine 4, e.g., typically between about 30% to about 70% of the water, is discarded or discharged from the washing machine 4 and replaced a quantity of fresh filling water to facilitate further washing of the laundry 8.

[054] According to the present invention, each time fresh filling water to be supplied to the washing machine 4, such filling water is first "ozonated," as described above, prior to being supplied to the internal drum 12 of the washing machine 4 so that only ozonated water is subsequently added to the washing machine 4 and utilized for washing the laundry 8. This assist with maintaining the laundry 8 within water which has a greater concentration of dissolved and/or encapsulated ozone therein. That is, the supplied ozone, for cleaning the laundry 8, is generally in an aqueous phase, i.e., dissolved and/or encapsulated within the water, and such aqueous phase ozone can immediately and instantaneously commence contact with the laundry 8 and facilitate cleaning, sterilization and/or sanitization of laundry 8 prior to and during each wash cycle. Moreover, by having a greater concentration of ozone dissolved and/or encapsulated within the water, this also minimizes the amount of ozone that rapidly gasses off from and out of the water and eventually exhausts from the washing machine 4 to possibly create a hazardous situation. [055] In order to further minimize the amount of ozone that rapidly gasses off from and out of the water, the ozonated water is preferably supplied to a lower most region of the internal drum 12 of the washing machine 4. By supplying the ozonated water in this manner, any ozone which has a tendency to be "gassed off," while being discharged into the internal drum 12, still must bubble and/or permeate through the water and the laundry contained within the washing machine 4 and thus still has a tendency to facilitate intimate contact with the laundry 8 thereby still achieving some cleaning, sterilization and/or sanitization of the laundry 8 prior to such gassed off ozone eventually exhausts from the washing machine 4 out through the exhaust vent 64, for example, as described below in further detail, or any other vent, port or opening in the washing machine.

[056] Prior to filling the washing machine 4 with filling water, a drain valve 40 is closed (see Fig. 5) to facilitate retention of the water 6 to be supplied to the internal chamber 14 of the internal drum 12 of the washing machine 4 from the water supply source 10. In addition, the washing machine 4 is generally equipped with an primary ozone generator 42 which commences production of ozone and injects the produced ozone into the sump 44 of the washing machine 4, via at least one and generally two or more spargers 46, where the ozone is discharged into the water 6. It is to be appreciated that not all washing machines have a sump and, in such instance, the ozone is merely injected into the water contained within the washing machine. The water 6 and dissolved and/or encapsulated ozone are agitated, during normal operation of the washing machine 4, due to the to and fro rotational agitating motion of the internal drum 12 to mix intimately and disperse the ozone, supplied via the spargers 46, throughout the entire volume of water 6 so that the ozone is readily able to contact and react with soap, dirt, soil, grime, germs, bacteria, etc., and the laundry 8 contained within the internal cavity 14 of the washing machine 4 during each wash cycle.

[057] Preferably, a conventional air supply device/oxygen concentrator 48 compresses room air to about 5 pounds of pressure or so and supplies the pressurized room air, via a conventional duct or pipe 50, to an air flow control valve 52 which regulates the flow rate of the air being supplied to the washing machine 4. The air supply device/oxygen concentrator 48, during normal compression of the air, typically removes nitrogen for the air to increase the oxygen content of the air and this also facilitates subsequent production of ozone. The air supply device/oxygen concentrator 48 also typically removes water, moisture and other impurities from the air priorto supplying the same to the airflow control valve 52.

[058] The air flow control valve 52 is connected, via a conventional duct or pipe 54, to supply the pressurized and regulated air to an inlet of the primary ozone generator 42 where a portion of such air, e.g., typically about 5% of the supplied air, is converted into ozone in a conventional fashion. As such conversion of air into ozone is conventional and well known in the art, a further detailed discussion concerning the same is not provided. An outlet of the primary ozone generator 42 is connected, via a conventional duct or pipe 56, to supply the generated ozone to the spargers 46 located within the sump 44 of the washing machine 4.

[059] If desired, the air supply device/oxygen concentrator 48 may incorporate a drying unit which further assists with adequately drying the air, i.e., removes substantially all of the moisture therefrom, prior to supplying the same to the air flow control valve 52. Alternatively, a separate air drier unit 58 (see Fig. 5) may be provide somewhere along the air supply path, prior to the air being supplied to the primary ozone generator 42, to assist with removing moisture therefrom. As shown, the air dryer unit 58 and a conventional duct or pipe 59 are located between the air supply device/oxygen concentrator 48 and the air flow control valve 52.

[060] The ozone, produced by the primary ozone generator 42, is supplied to the sparger or spargers 46 and injected into the water 6 contained within the sump 44 of the washing machine 4 via one or more injector nozzles 60 supported by the spargers 46 (see Fig. 6). Preferably, the injector nozzles 60 injects the ozone downwardly toward the drain valve 40 of the washing machine 4 to facilitate further suspension, entrainment, encapsulation, dispersion and/or mixing of the ozone in the water 6 contained within the sump 44 and thereby provide a more uniform mixture and dispersion of the ozone within the water 6 contained within the sump 44 as well as throughout the entire water 6 contained within the washing machine.

[061] The produced ozone typically has a particle size of about 2 microns to 20 microns such that some of the ozone is not readily dissolved, to any substantial extent, in the water 6 contained in the sump 44 but is encapsulated, suspended, dispersed and/or entrained within the water 6 and thus the ozone is readily available, in gaseous form, for reacting with any dirt, soil, grime, grease, germs, bacteria, etc., contained in the laundry 8 being washed by the washing machine 4. As is conventional, the ozone will only typically last for a time period of between about 2 to about 5 minutes or so before the ozone naturally converts back into oxygen and lose its disinfectant and/or sanitization capability.

[062] To facilitate control of the amount of ozone generated, an ozone exhaust or sampling detector or sensor 62 is located in, immediately adjacent or near one of the conventional exhaust vents, ports or outlets 64 of the washer machine 4, such as a soap vent, soap chute, an air bleed-off vent, etc. Alternatively, the ozone exhaust or sampling detector or sensor 62 can be directly connected to a sampling outlet or aperture for periodically withdrawing a sample of gas from the washing machine and, once the ozone concentration of the washing machine is detected by the ozone exhaust or sampling detector or sensor 62, this withdrawn sample can then either be discarded or possibly return back to the washing machine. The ozone exhaust or sampling sensor 62 either directly communicates with or is typically located within or as close as possible to the sampling or exhaust outlet 64 to obtain an undiluted sample of the ozone being sampled or exhausted from the washing machine 4. The ozone exhaust or sampling sensor 62 will monitor the withdrawn sample or the air escaping or exhausting from the washer machine 4, during operation thereof, to detect the concentration of the ozone contained therein. In the event that the ozone concentration level of the air sampled or exhausting from the washing machine 4 is above the target value, e.g., above a target value of 1 .0 parts per million for example, the ozone exhaust or sampling sensor 62 will then convey a signal to a relay or a proportionally variable or adjustable component 66 (see Fig. 8) which controls the supply of electrical power to the primary ozone generator 42 so as to either "trip" and thereby temporarily interrupt further production of ozone by the primary ozone generator 42 for a sufficient period of time, e.g., any where from a few seconds to about thirty minutes or so, or modify, alter, vary or reduce production of ozone to a lower or reduced level until the ozone exhaust or sampling sensor 62 again detects a level of ozone below the target value, e.g., detects an ozone level in the escaping air below 1.0 parts per million, for example.

Any ozone which collects on a detection surface of the ozone exhaust or sampling sensor 62 will typically remain there until the ozone eventually "burns off" or is naturally converted back into oxygen over time by the natural ozone conversion process. Generally, the ozone will last anywhere between about 2 to about 20 minutes or so, e.g., typically lasting between 3 and 5 minutes, before the ozone naturally converts back into oxygen. As long as the ozone exhaust or sampling sensor 62 detects an excessive amount of ozone, e.g., an amount of ozone greater than the adjusted sensitivity position of the ozone exhaust or sampling sensor 62 (e.g., the ozone exhaust or sampling sensor 62 is typically set to detect from about 0.3 to about 1.0 parts per million of ozone, for instance), the ozone exhaust or sampling sensor 62 will maintain the relay or the proportionally variable or adjustable component 66 in an active or tripped state so as to prevent the supply of electrical power to the primary ozone generator 42 and thereby prevent the further production of additional ozone or alter the supply of power to the primary ozone generator 42 so as to reduce production of ozone. As soon as substantially all of the ozone (depending upon the sensitivity setting of the ozone exhaust or sampling sensor 62) which collected on the surface of the ozone exhaust or sampling sensor 62 has sufficiently "burned off' or dissipated therefrom, or the ozone exhaust or sampling sensor 62 otherwise detects an ozone level less than the target value, the ozone exhaust or sampling sensor 62 will then discontinue sending a signal to the relay or the proportionally variable or adjustable component 66, which either temporarily interrupts or otherwise alters the supply of electrical power to the primary ozone generator 42 to modify, lower, reduce or discontinue further ozone production. As a result, the relay or the proportionally variable or adjustable component 66 again allows the electrical power to flow and be supplied to the primary ozone generator 42 and the primary ozone generator 42 then immediately commences production of additional ozone at the initial level for use during the current and any subsequent stage(s) or cycle(s) of the entire wash cycle.

The system 2 is also equipped with an area ozone level detector or sensor 68 which monitors the level of the ozone contained within a room or an area accommodating the washing machine 4 or a plurality of washing machines 4, e.g., a laundry mat or some other commercial washing facility such as a hospital or a prison, for example. In the event that the area ozone level sensor 68 detects an excessively high or unsafe amount of ozone located within the room or the area accommodating the one or more washing machines 4, e.g., detects a room concentration level of ozone also above the target value or some other common area target value, which is also currently typically in excess of 0.1 parts per million, the area ozone level sensor 68 will then convey a signal to a relay or a proportionally variable or adjustable component 66 which "trips" or interrupt further production of ozone, or possibly decreases or reduces production of ozone by each of the primary ozone generators 42 for a sufficient period of time, e.g., any where from a few seconds to about thirty minutes or so or possibly completely shuts down all of the washing machine(s) 4 to prevent any further production of ozone by any of the primary ozone generators 42 or as well as any of the filling water ozone generators 30, until the area ozone level sensor 68 again detects a level of ozone in the room or the area accommodating the washing machine(s) 4 is below the common area target value. The sensitivity setting for the area ozone level sensor 68 is also typically adjustable but typically has a sensitivity range of between about 0.03 to about 0.1 parts per million or greater, for example. Alternatively, or in addition, the area ozone level sensor 68 will merely shut off or interrupt the supply of power to the air supply device/oxygen concentrator 48, which supplies the pressurized air to the primary ozone generator 42, as well as the air supply device/oxygen concentrator 36, which supplies the pressurized air to the filling ozone generator 30, and thereby interrupts all further production of ozone by the system 2, or possibly reduces further production of ozone.

[065] This relay, or proportionally variable or adjustable component , 66 will remain tripped or activated until the area ozone level sensor 68 again determines that an acceptable level of ozone, below the common area target value, is currently present in the room or the area accommodating the washing machine(s) 4. Once this occurs, the area ozone level sensor 68 will discontinue sending a signal to the relay or the proportionally variable or adjustable component 66, which deactivates the relay or component 66 so that the relay or component 66 again allows power to flow to the ozone generator(s) 42 and/or the air supply device/oxygen concentrator 48 and to the ozone generator(s) 30 and/or the air supply device/oxygen concentrator 36 which then again allow production or manufacture of additional ozone during the remainder of the wash step or stage. Alternatively, the area ozone level sensor 68 will discontinue sending a signal to the relay or the proportionally variable or adjustable component 66, which deactivates the relay or component 66 so that the relay or component 66 again allows the original flow of power to the ozone generator(s) 42 and/or the air supply device/oxygen concentrator 48 and to the ozone generator(s) 30 and/or the air supply device/oxygen concentrator 36 so they may resume normal production of ozone during the remainder of the wash step or stage. The area ozone level sensor 68 prevents a potentially hazardous condition from occurring during operation of one or more washing machines 4 due to the production and collection of excessive ozone within the room or the common area.

[066] Preferably, the area ozone level sensor 68 is connected to a relay or a proportionally variable or adjustable component 66 which controls the supply of the modified/altered/interrupted electrical power to only the air supply device/oxygen concentrator 48 and/or the air supply device/oxygen concentrator 36 in order to control the production of the ozone during operation of the washing machine 4. As a result of such electrical power modification/alteration/interruption, the production of ozone is reduced, discontinued or interrupted since reduced or no pressurized air flows through the primary ozone generator 42 and the filling water ozone generator 30 and thus reduced or no ozone is produced by any of the ozone generators 30, 42 even though the ozone generators 30, 42 still may be supplied with electrical power. Alternatively, the relay or the proportionally variable or adjustable component 66, when tripped or activated by the ozone exhaust or sampling sensor 62 and/or the area ozone level sensor 68, can also be coupled to the primary ozone generator(s) 42 and the filling water ozone generator(s) 30, and/or the air supply device/oxygen concentrator(s) 36, 48 and/or the air flow control valve(s) 40, 52 so as also to control operation of all of those components and modify/alter/interrupt the supply of electrical power to one, two or all three of the primary ozone generator(s) 30, 42, the air supply device/oxygen concentrator(s) 36, 48 and/or the air flow control value(s) 40, 52 when an excessive amount of ozone is detected.

[067] It is to be appreciated that there are a variety of different ways for reducing/modifying/altering/interrupting the production of ozone by the primary ozone generators 42. For example, the ozone exhaust or sampling sensor 62 and/or the area ozone level sensor 68 can activate a valve (not shown), located between the air flow control valve 52 and the primary ozone generators 42 which diverts all or only a portion of the supplied air directly to the spargers 46 so that the air and/or possibly some ozone can mix with the water 6 contained in the sump 44. The important aspect is that the system is controlled, in some manner, so as to reduce or no longer able to produce and/or supply a reduced amount of ozone or completely discontinue supplying ozone until the ozone exhaust or sampling sensor 62 and/or the area ozone level sensor 68 again detect a safe level of ozone, below the common area target value, both within the washing machine(s) 4 and within the room or the common area.

[068] Although the target values for the ozone exhaust or sampling sensor 62 and the area level ozone sensor 68 are both currently 1 .0 parts per million of ozone, it is to be appreciated that one or both of the ozone exhaust or sampling sensor 62 and/or the area level ozone sensor 68 could be a variable sensor. That is, as the ozone exhaust or sampling sensor 62 and/or the area level ozone sensor 68 detects the ozone level in the exhausting air or room approaching either 1.0 or 0.1 parts per million of ozone, or some higher or lower level depending upon the requirements and/or the settings setting of the particular sensor, the ozone sensor 62, 68 will issue a variable command to the primary ozone generator 42 which proportionally decreases or reduces the amount of ozone being produced and thereby continuously maintain a safe level of ozone which is either being exhausted from the washing machine and/or located within the room or area accommodating the washing machine(s) 4. It is to be appreciated that if the ozone sensor(s) 62 or 68 senses that the ozone level is only gradually approaching an unsafe level of ozone, the ozone sensor(s) 62 or 68 could send a signal which gradually reduces the production of ozone by the primary ozone generator 42 and/or the filling water ozone generator 30. If, however, the ozone sensor(s) 62 or 68 senses that the ozone level is rapidly approaching an unsafe level, the ozone sensor(s) 62 or 68 will issue a signal more rapidly reducing or possibly completely interrupting the production of ozone. Such variable control of the primary ozone generator 42 and/or the filling water ozone generator 30, by the ozone exhaust or sampling sensor 62 and/or the area level ozone sensor 68, tends to minimize the duration of time, if any, that the ozone generators 30, 42 are not actually producing any ozone during operation of the washing machine and tends to result in a more continuous supply of ozone to the washing machine to ensure that an adequate supply of ozone is always present in the washing machine during each wash cycle. That is, the ozone contained within the water 6 is generally a control band which is typically between 50 and 100% of the target value.

According to the present invention, it is desirable to control the production of ozone and supply the produced ozone to the washing machine 4 so that the amount of ozone contained within the water within the internal drum 12 of the washing machine 4 has the greatest practical amount of dissolved and/or encapsulated ozone therein which is at or slightly below the target value. Such procedure ensures the highest CT value during the shortest possible wash cycle and thereby assist with maximum cleaning, sanitization and/or sterilization of the laundry 8. [070] Typically during a commercial wash cycle, generally there are about eight wash steps, cycles or stages. The first stage is typically when the greatest amount or quantity of ozone is required and should be produced by both the filling water ozone generator 30 and the primary ozone generator 42. According to the present invention, preferably both the filling water ozone generator 30 and the primary ozone generator 42 are always set to its highest possible ozone production level so that the ozone generators 30, 42 produces a maximum amount of ozone, e.g., produces between about 4 grams per hour of ozone at an ozone concentration level of about 5% ozone, and such ozone is immediately available for use during the first wash stage. This ozone "relaxes" the laundry and activates the laundry detergent or soap and assists with rapidly "burning off" any dirt, grime, grease, soil, etc., as well as killing any infectious diseases, super bugs, germs and/or bacteria contained within the clothing or laundry 8 being washed.

[071] In the event that either the ozone exhaust or sampling sensor 62 and/or the area ozone level sensor 68 determines that an excessive amount of ozone is present in either the air being exhausted or in the room or area accommodating the washing machine(s) 4, such ozone sensor 62 or 68 will send a signal to the relay or the proportionally variable or adjustable component 66 which modifies, alters, trips or turns off the primary ozone generator 42 to reduce or prevent further production of ozone for a desired period of time, e.g., until an excessive amount of ozone is no longer detected by the ozone exhaust or sampling sensor 62 and/or the area ozone level sensor 68, or merely reduces production of ozone by the primary ozone generator 42. As is noted above, once the level of the ozone in the sampled or exhaust gas(es) and/or the room or area sufficiently decreases to below the target value, then both the filling water ozone generator 30 and the primary ozone generator 42 will be again reactivated and allowed to commence further production of ozone or resumption of production of ozone at an increased amount and supply the same to the washing machine 4.

[072] During the second and subsequent wash stages, since much of the dirt, grime, grease, soil, etc., has already been partially or completely removed from the clothing or laundry 8 and since much of the germs, bacteria, etc., have already been partially or completely killed, typically less ozone is required. The addition of extra ozone during the initial portion of the first wash stage assists with "relaxing" the clothing or laundry 8 such that the clothing or laundry 8 more readily releases its dirt, grime, grease, soil, etc. As a result of this increase in the amount of ozone supplied during the first wash stage, a sufficient amount of ozone may still be present within the wash volume, within the internal drum 12, and/or within the clothing or laundry 8 at the end of the first wash stage so that either the ozone exhaust or sampling sensor 62 and/or the area ozone level sensor 68 detects excessive ozone being present and may possibly maintain the primary ozone generator 42 in an inactive state or a relatively low ozone production rate for one or more subsequent wash stages in a row or may maintain the primary ozone generator 42 in an inactive state or a reduced production state for an initial portion of each subsequent wash stage of the wash cycle so that no additional ozone or a smaller amount of ozone is produced. Is to be appreciated that the filling water, during each subsequent wash cycle, is initially ozonated prior to being added to the internal drum 12 of the washing machine 4. This filling process assists with maintaining a desired amount of ozone within the internal drum 12.

As shown in Fig. 7, the improved CT value results, achieved by the washing machine according to the present invention, are depicted by the plotted uppermost graph results shown in that diagram, the plotted lowermost graph results shown in that diagram are in accordance with a prior art system similar to that shown in Fig. 1 while the plotted middle graph results shown in that diagram are in accordance with a prior art system similar to that shown in Fig. 2. As is readily apparent from this plotted uppermost graph results, the present invention is able to achieve and retain a much higher percentage of dissolved and/or encapsulated ozone within the water so that the average amount of ozone dissolved and/or encapsulated within the water constantly and constantly remains at a much higher level than that achieved by any prior other prior art system, i.e., the dissolved and/or encapsulated ozone remains within a control band which between 50% and 100% of the target value. According to the present invention, the average amount of ozone, dissolved and/or encapsulated within the water, remains within a control band which is typically slightly above, at or slightly below the preset target value of the system and this maximizes the CT value of the system and thereby improves the sterilization and/or disinfection of infectious diseases, germs, bacteria, etc. That is, the present invention controls the amount of ozone to have an average value which is generally between 50% and 100% of the target value, more preferably the present invention controls the amount of ozone to have an average value which is generally between 60% and 100% of the target value, and most preferably the present invention controls the amount of ozone to have an average value which is generally between 70% and 100% of the target value.

[074] With reference to Fig. 8, a description concerning a plurality of washing machines (only four of which are shown in the Figure) will now be discussed. According to this embodiment, a single air supply device/oxygen concentrator 48 generates an adequate supply of compressed air and supplies the compressed air, via conventional ducts or pipes 50, to all (e.g., four) of the individual air flow control valves 52, which each, in turn, regulate the flow rate of the air being supplied to each respective washing machine 4. Each air flow control valve 52 is connected, via a respective conventional duct or pipe 54, to supply the regulated air to an inlet of a respective primary ozone generator 42 where the air is converted to ozone, as discussed above, and supplied, via conventional duct or pipe 56, to the sump 44 or internal drum of the respective washing machine 4. As with the previous embodiment, each one of the washing machines is equipped with an ozone sample sensor of an ozone exhaust or sampling sensor 62, which is provided within the internal drum 12, along or within an exhaust duct or along, within or adjacent an exhaust vent, an outlet, a sampling port or any other aperture 64 of the respective washing machine 4. In the event that the ozone exhaust or sampling sensor 62 detects an excessive amount of ozone, this sensor will control the associated ozone generator 42 to vary or interrupt the further production of ozone until the ozone concentration level of the air sampled or exhausting from the washing machine 4 again returns back below the target value.

[075] In addition, according to this embodiment, all of filling water for each one of the washing machines 4 passes through a respective venturi 22 where the water is accelerated, via the constriction 24 of the venturi 22, and such acceleration of the water induces a vacuum in the supply line 34 which draws in ozone which is supplied from the ozone system 29, incorporating the filling ozone generator 30, to the venturi inlet 28 of the venturi 22, as discussed above with the previously described embodiment. The ozone and the water then decelerate and initially commence intimate mixing with one another and the water/ozone mixture then passes through a static mixer 32. As the water/ozone mixture passes through the static mixer 32, the ozone is further intermittently mixed, dissolved, encapsulated and/or dispersed within and throughout the water and the static mixer thereby facilitates a more complete and thorough dissolving and/or encapsulation of the ozone within the water. As the ozone and water mixture exits the static mixer 32, preferably this mixture undergoes a dwell time of about 3 seconds, plus or minus one second, as described above.

[076] As with the previous embodiment, the filling ozone generator 30 is connected to the venturi inlet 28 of the venturi 22 via an ozone supply line 34 for supplying ozone thereto. Typically, the filling ozone generator 30 will constantly and continuously produce ozone during the entire operation of the washing machine 4 and such produced ozone is normally retained within the filling ozone generator 30 and only withdrawn from the filling ozone generator 30 one required, e.g., as water passes through the venturi 22 and sucks the ozone from the filling ozone generator 30. Each filling ozone generator 30 is electrically connected to the control panel CP to facilitate both control and operation of all the filling ozone generators 30 and all of the primary ozone generators 42 as well as facilitate varying, modifying, altering or interrupting production thereof in the event that a hazardous situation arises.

[077] As discussed above, the ozone system 29 includes a conventional air supply device/oxygen concentrator 36 for compressing room air and an air flow control valve 40 for regulating the flow rate of the air being supplied to filling ozone generator 30. As these components operate in the same manner discussed above, further description concerning the same is not again provided. [078] According to this embodiment, generally only a single area ozone level sensor 68 monitors the level of the ozone contained in the common area accommodating all (e.g., four) of the washing machines 4. In the event that the area ozone level sensor 68 detects an unsafe amount of ozone contained within the room or the area accommodating the washing machines 4, the area ozone level sensor 68 will send a signal to a second relay or proportionally variable or adjustable component 70 which is connected with the single air supply device/oxygen concentrator 48. The second relay or proportionally variable or adjustable component 70 alters, adjusts, modifies or interrupts the flow of electrical power to the single air supply device/oxygen concentrator 48 and thus the flow of air to each one of the (e.g., four) primary ozone generators 42 so that none of the primary ozone generators 42 is thereafter able to manufacture any further ozone or they produce a reduced quantity of ozone. It is to be appreciated that the flow of air and/or electrical power to the filling ozone system 29 is also typically interrupted, modified, altered or varied. Such alteration, modification or interruption in the production of ozone will continue until the area ozone level sensor 68 again determines that a safe level of ozone, below the target value, is now contained within the room. Thereafter, the flow of electrical power to the single air supply device/oxygen concentrator 48 and/or the filling ozone system 29 is again established back to their original levels and all the filling and primary ozone generators 30, 42 are then able to continue with further manufacture ozone at the original level, provided that the ozone being sampled or exhausted from each respect washing machine 4 is still below the target value.

[079] The ozone system 2 may be equipped with an indicator which provides a visual indication that substantially all of the super bugs, germs, bacteria and/or infectious diseases contained within the clothing or laundry 8 being washed has been killed. For example, the ozone system 2 may be equipped with separate "red" and "green" lights (labeled "R" and "G", respectively) 72 and 74, as shown in Fig. 8. Upon activation of the ozone system 2, one of the relays or the proportionally variable or adjustable components 66 supplies electrical power to the "red" light 72 to indicate visually to the operator that the clothing or laundry 8 being washed has not had sufficient contact time with the dissolved and/or encapsulated ozone and thus may still contain live super bugs, germs, bacteria and/or infectious diseases. The "red" light 72 will remain illuminated until the ozone system 2 determines, as described above, that the laundry 8 has had a sufficient contact time with the ozone contained within the wash water, e.g., a sufficient CT value has been achieved. Once the ozone system 2 determines that the laundry 8 has had a sufficient contact time with the ozone contained within the wash water, e.g., a sufficient CT value has been achieved for the laundry 8, the ozone system 2 will interrupt the supply of electrical power to the "red" light 72 and thereafter another the relay or the proportionally variable or adjustable component will be activated to supply electrical power to and illuminating the "green" light 74 which provides a visual indication to the operator that substantially all of the super bugs, germs, bacteria and/or infectious diseases, contained within the clothing or laundry 8 being washed, have been reliably killed. It is to be appreciated that the "red" light 72 will remain illuminated until the ozone system 2 determines that the air sampled or exhausting from the washing machine 4 has a desired ozone concentration level, e.g., an ozone concentration level at, slightly below or slightly above the target value, of 1.0 parts per million for example, for a desired duration of time. Each time the door 18 is opened and/or closed, the ozone system 2 is reset, e.g., the system returns back to only illuminating the "red" light 72.

With reference now to Fig. 9, a method and a system for continuously or intermittently detecting or measuring the ozone level, in the washing machine 4 during each wash cycle, will now be described. As shown in this Figure, the detectors 74 are located within, at or adjacent the exhaust vent 62, or any other aperture or opening, of each one of the washing machines 4 or communicate directly with the interior of the washing machine for sensing, monitoring or detecting an ozone content or concentration of the washing machine or an ozone content or concentration in the gases sampled from, or exiting or exhausting from the washing machine. The internal cavity 14 of each washing machine 4 is typically supplied with about 2 cubic feet of air per minute during the entire wash cycle. This supplied air facilitates sampling or exhausting some of the gassed off ozone from the internal cavity 14 of the washing machine 4 and the content of the ozone contained within this sampled or exhaust gas is then measured by the detector 74. The detector 74 continuously or intermittently detects, samples or measures the ozone level or concentration, e.g., the detector intermittently detects the ozone level in the sample or exhaust gases once a second, once every 5 seconds, once every 10 seconds, once every 20 seconds, once every 30 seconds, once a minute, etc., to determine ozone readings of the washing machine and then calculate an average ozone reading. The average ozone readings are then utilized to determine a "time wait average" (TWA) for the ozone during each wash cycle. Thereafter, the TWA is multiplied by the time or duration of each wash cycle to determine the current CT value for the current wash cycle. This procedure is repeated for each one of the wash cycles and the calculated current CT value for each wash cycle are added with one another to determine the cumulative CT value for the washed laundry 8 during the entire wash cycle, i.e., from the beginning of the first wash cycle to the end of the wash cycle which terminates when the door 18 is opened to provide access the laundry 8. The detector 74 is preferably coupled to a visual display 76 which can instantaneously display the both currently detected CT value 78 for the current wash cycle and may have a second display which displays the cumulative CT value 80 for the current as well as all previous wash cycle(s).

[081] Preferably all of this information is logged into an optional computer 82 for later referencing by service personnel to verify the current and cumulative CT values 80 for each wash performed by each one of the washing machines 4. The TWA is initiated as soon as the start button is actuated and the method and the system continue detecting, sampling and/or measuring the ozone level or concentration in the sample or exhaust gases being exhausted from the washing machine 4 until either the final wash cycle is completed or the washing machine 4 discontinues operation for some reason.

[082] The method and system preferably includes a variable adjustment or setting which allows the operator to adjust a target cumulative CT value to be achieved, following completion of the entire wash cycle of the washing machine 4, in order for the laundry 8 to be determined, or possibly "certified", as being clean, deodorized and/or sanitized. In the event that the target cumulative CT value is not achieved, then the laundry 8 is determined as "failing" and thus typically has to be rewashed in a further attempt to achieve the target cumulative CT value where the laundry 8 can be determined or certified as "pass". Alternatively, the method and the system can communicate such failure information to the control panel CP of the associated washing machine 4 which, upon receipt of such a communication, increases the wash duration of the final wash cycle, e.g., add a residual wash time of anywhere from a few minutes to as much as ten minutes or so, in an attempt to achieve or exceed the target cumulative CT value so the laundry can be certified as "pass", e.g., the green light can be illuminated, and thereby avoid the need for rewashing the laundry 8. For example, the cumulative CT value for the washing machine 4 may be set to a value of at least 21 , for example, to ensure that all of the infectious diseases listed in Table 1 are completely and throughly killed during the entire wash cycle and the laundry 8 can be determined as being clean, deodorized and sanitized.

In addition, according to a preferred form of the invention, the area or the room detector 84 is provided and the room detector 84 communicates with the optional computer 82, if present, for later referencing by service personnel to determine whether or not any hazardous situations occurred within the room or common area and when and for how each such hazardous situation persisted, and/or with the control panel CP. The room detector 84 continuously or intermittently detects or measures the ozone level contained within the room, e.g., the room detector 84 intermittently the detects the ozone level in the exhaust gases contained within the room or common area once a second, once every 5 seconds, once every 10 seconds, once every 20 seconds, once every 30 seconds, once a minute, etc., to determine ozone readings as well as a calculated average ozone reading for the room or common area. This information is then recorded in a conventional storage device of the control panel CP, e.g., a buffer of the computer 82 or the control panel CP for example, for later access by service personnel as noted above. [084] It is to be appreciated, from the above description, that the ozone exhaust or sampling detector or sensor 62 is arranged so as to control, i.e., alter, modify and/or adjust, the production or the supply of ozone to the internal drum of the respective washing machine so at to maintain the concentration of ozone, within the internal drum of the washing machine, as close to, but generally below the target level, so that the laundry is completely washed and sanitized within the shortest duration of time. Such control can include a reduction in the current production or the current supply of ozone to the internal drum of the washing machine or a temporary interruption or discontinuance in production or supply of ozone to the internal drum of the washing machine.

[085] It is further to be appreciated that the ozone exhaust or sampling detector or sensor for the washing machine is installed so as to be able to sense, monitor, sample or detect the concentration level of ozone either within internal drum or anywhere else within the washing machine, or in any sampling port or exhaust vent associated anywhere within or on the washing machine for sampling or detecting the washing machine ozone concentration level. The particular sampling port, exhaust vent or other aperture or opening is not important as long as the obtained sample or exhausted gas is not too dilute so that it does not accurately reflect the concentration level of ozone within the washing machine.

[086] Since certain changes may be made in the above described improved ozone generating and monitoring system, without departing from the spirit and scope of the invention herein involved, it is intended that all of the subject matter of the above description or shown in the accompanying drawings shall be interpreted merely as examples illustrating the inventive concept herein and shall not be construed as limiting the invention.

Claims

Wherefore, l/we claim:

1 . A method of controlling a concentration of ozone of a washing machine to be at or below a target value so that a cumulative contact time of the ozone with laundry being washed approaches a duration of time of an entire wash cycle of the washing machine thereby ensuring killing of any infectious diseases contained within the laundry, the method comprising the steps of:

supplying ozonated waterto the washing machine upon initially filling the washing machine with water;

supplementing the initially supplied ozonated water by supplying additional ozone to the wash machine during each other desired wash cycle;

monitoring a concentration of ozone within the washing machine; and controlling the supply of ozone to the wash machine so that the concentration of ozone of the washing machine being controlled to be within a band which between 60% and 100% of the target value and the cumulative contact time of the ozone with the laundry is at least 60% of the duration of time of the entire wash cycle.

2. The method according to claim 1 , further comprising the steps of using between 25 and 40 minutes as the duration of the entire wash cycle, and

using 15 as the contact time between the ozone and the laundry.

3. The method according to claim 1 , further comprising the step of supplying ozonated water to the washing machine each time the washing machine is filled during a subsequent wash cycle.

4. The method according to claim 3, further comprising the step of ozonating the filling water by first passing the filling water through a venturi where the filling water is initially mixed with the ozone and subsequently passing the mixture of the ozone and the water through a static mixer where the ozone is further intimately mixed and encapsulated within the water prior to the ozonated filling water being discharged into the washing machine.

5. The method according to claim 4, further comprising the step of providing the ozonated filling water, once the ozonated water exits from the static mixer, with a dwell time of between about 2 seconds to about 4 seconds to increase further intimate mixing and encapsulation of the ozone within the water prior to discharging the ozonated filling water into the washing machine.

6. The method according to claim 1 , further comprising the step of only injecting additional ozone into the water located within the washing machine, and modifying the supply of the ozone to the washing machine when the monitored concentration of ozone within the washing machine exceeds the target value.

7. The method according to claim 1 , further comprising the step of injecting additional ozone into the water located within the washing machine, and, when the monitored concentration of ozone within the washing machine exceeds the target value, reducing the supply of the ozone to the washing machine at least until the monitored concentration of ozone within the washing machine is equal to or below the target value.

8. The method according to claim 1 , further comprising the step of controlling the supply of ozone to the wash machine so that the monitored concentration of ozone within the washing machine is controlled to be within a band between 70% and 100% of the target value and the cumulative contact time of the ozone with the laundry is at least 70% of the duration of time of the entire wash cycle.

9. The method according to claim 1 , further comprising the step of controlling the supply of ozone supplied to the wash machine so that the monitored concentration of ozone within the washing machine is controlled to be within a band between 60% and 100% of the target value and the cumulative contact time of the ozone with the laundry is about 80% of the duration of time of the entire wash cycle.

10. The method according to claim 1 , further comprising the step of using at least 21 as the cumulative contact time of the ozone with laundry being washed to ensure killing of any infectious diseases contained within the laundry.

1 1. A system for controlling a concentration of ozone of a washing machine to be at or below a target value so that a cumulative contact time of the ozone with laundry being washed by the washing machine approaches a duration of time of an entire wash cycle of the washing machine thereby ensuring killing of any infectious diseases contained within the laundry, the system comprising: a washing machine having an internal drum for containing laundry and a quantity of a water;

an ozone generator, connected to the washing machine, for supplying ozone to the washing machine, and the ozone generator supplying ozonated water to the washing machine upon initially filling the washing machine with water, and supplying additional ozone to the wash machine during at least one other wash cycle;

an ozone sample or exhaust sensor for sensing a level of ozone in the washing machine during operation thereof, and the ozone sample or exhaust sensor being coupled for modifying production of ozone, by the ozone generator, when the sensed level of ozone of the washing machine, sampled or exhausting from the washing machine by the ozone sample or exhaust sensor, exceeds a target level such that the supply of ozone to the washing machine is controlled so that the concentration of ozone is within a band between 60% and 100% of the target value and the cumulative contact time of the ozone with the laundry is at least 60% of the duration of time of the entire wash cycle.

12. The system for controlling the concentration of ozone of the washing machine to be at or below a target value according to claim 1 1 , wherein the ozone sample or exhaust sensor senses an amount of ozone contained in air sampled or exhausting from the washer machine and, in an event that the concentration of ozone in the air sampled or exhausting from the washing machine exceeds the target level, the ozone sample or exhaust sensor modifies supply of ozone to the washing machine until the ozone sample or exhaust sensor again sense the concentration of the ozone in the air sampled or exhausting from the washing machine is at or below the target valve.

13. The system for controlling the concentration of ozone of the washing machine to be at or below a target value according to claim 1 1 , wherein the system further comprises an area ozone level sensor which detects a level of ozone contained within an area accommodating the washing machine, and, in an event that the area ozone level sensor detects an excess level of ozone contained in the area, the area ozone level sensor modifies production of ozone until the area ozone level sensor again senses the concentration of the ozone in the area accommodating the washing machine is below a safe level of ozone.

14. The system for controlling the concentration of ozone of the washing machine to be at or below a target value according to claim 1 1 , wherein the duration of the entire wash cycle is between 25 and 40 minutes, and the contact time between the ozone and the laundry is 15.

15. The system for controlling the concentration of ozone of the washing machine to be at or below a target value according to claim 1 1 , wherein the system only supplies ozonated water to the washing machine each time the washing machine is filled during an initial and any subsequent wash cycle.

16. The system for controlling the concentration of ozone of the washing machine to be at or below a target value according to claim 15, wherein a venturi facilitates initial mixing of the ozone with the filing water to form the ozonated water, and the ozonated water is then supplied to a static mixer where the ozone is further intimately mixed and encapsulated within the water prior to the ozonated filling water being discharged into the washing machine.

17. The system for controlling the concentration of ozone of the washing machine to be at or below a target value according to claim 16, wherein the ozonated filling water, once the ozonated water exits from the static mixer, is provided with a dwell time of between about 2 seconds to about 4 seconds, to increase further intimate mixing and encapsulation of the ozone within the water, prior to the ozonated filling water being discharged into the washing machine.

18. The system for controlling the concentration of ozone of the washing machine to be at or below a target value according to claim 1 1 , wherein any additional ozone, supplied to the washing machine, is injection into the water located within the washing machine, and a control mechanism controls the supply of the ozone to the washing machine when the monitored concentration of ozone within the washing machine exceeds the target value

19. The system for controlling the concentration of ozone of the washing machine to be at or below a target value according to claim 1 1 , wherein the supply of ozone to the wash machine is controlled so that the monitored concentration of ozone within the washing machine is within a band between 70% and 100% of the target value and the cumulative contact time of the ozone with the laundry is at least 70% of the duration of time of the entire wash cycle.

20. The system for controlling the concentration of ozone of the washing machine to be at or below a target value according to claim 1 1 , wherein the cumulative contact time of the ozone with laundry being washed is at least 21 to ensure killing of any infectious diseases contained within the laundry.