JP2011088024A - Apparatus for producing ozone-containing water, cleaning apparatus employing the same, method for producing ozone-containing water, and cleaning method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily produce ozone-containing water of especially high cleaning efficiency and to manufacture a cleaning apparatus of high cleaning efficiency employing the same. <P>SOLUTION: Water 30 flows into a body pipe 121 of a microbubble generator 12 from an ejection port 122 thereof. The body pipe 121 is disposed in water from which ozone-containing water is produced. A plurality of slits 124 are formed in the lower part of the body pipe 121 as shown in drawing 2. The plurality of slits 124 each communicating with water present inside of the body pipe 121 and water present outside thereof are disposed parallel to each other to form a tilt angle θ relative to the ejection port 122 side from the direction connecting the ejection port 122 and a collision wall 123, toward the ejection port 122 side. A gas feed pipe 125 is disposed on a position closer to the ejection port 122 than to the plurality of slits 124 to communicate with the body pipe 121, and ozone (a gas) is introduced into the body pipe 121 therefrom by virtue of a negative pressure generated by the water flow therein. Namely, an apparatus 10 for producing ozone-containing water is caused to function by water circulated in the microbubble generator 12 by driving a pump 16. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to water to which fine bubbles of ozone are added, that is, an ozone water generating device that generates ozone water, an ozone water generating method, and a cleaning device and a cleaning method for cleaning various materials using these.

  For example, in a washing machine for washing clothes, the clothes are immersed in washing water mixed with various detergents, and the clothes are cleaned by rotating and stirring together with the washing water. At this time, as the rotation and agitation are vigorously performed for a long time, the cleaning effect increases, while the possibility that the garment itself is damaged by mechanical impact increases. The same applies to items other than clothing as long as the item to be cleaned may be damaged. Therefore, there has been a demand for a cleaning apparatus that can provide a high cleaning effect without vigorous rotation and stirring.

As one method for this purpose, for example, Patent Document 1 describes a cleaning device using ozone water. In this technique, ozone (O ₃ ) gas having a high oxidizing action, sterilizing action, deodorizing action, organic substance removing action, etc. is generated and bubbled, and ozone is melted or contains many bubbles of ozone. Ozone water is generated. When this ozone water is used in the washing apparatus (washing machine), it has a higher washing ability than washing water using a normal detergent. At this time, since ordinary clothing is not adversely affected by ozone, it is particularly effective against contamination by organic matter. Accordingly, a sufficient cleaning effect can be obtained without vigorous rotation and stirring when washing the clothes, so that damage to the clothes can be reduced.

At this time, the ozone gas itself can be easily produced from the oxygen gas by, for example, a so-called silent discharge method in which oxygen (O ₂ ) gas is ionized and recombined by discharge between electrodes. In addition, ozone is toxic to the human body at high concentrations, but is unstable, and is easily decomposed into normal non-toxic oxygen molecules in air at room temperature, so that it is easy to handle. Therefore, the structure of the cleaning apparatus using this is not complicated. Ozone water is easily obtained by bubbling this ozone gas in water. In addition, by using ozone instead of a conventional detergent, it is possible to reduce environmental pollution caused by the detergent.

  Therefore, this has provided a cleaning device that has sufficient cleaning ability for clothes and the like, reduces damage to clothes, and is inexpensive. The same applies to the case of cleaning materials that are not adversely affected by ozone, such as metal parts and semiconductor wafers.

  On the other hand, Patent Document 2 describes conditions for ozone water suitable for cleaning. Here, in particular, ozone water containing bubbles (nanobubbles) of ozone gas having a bubble diameter in the range of 50 to 500 nm is suitable for cleaning, and since this ozone water has a particularly high bactericidal effect, it may be effective. Indicated. This ozone water can be generated by adjusting the electrical conductivity of water and applying a physical stimulus such as applying ultrasonic waves.

JP-A-8-141270 JP 2005-246293 A

  However, in the technique described in Patent Document 1, the optimal ozone water conditions for cleaning are not always clear. For example, it is obvious that the effect is large if the concentration of ozone is high, but the conditions other than this are not clear. However, ozone decomposes easily in a short time to become non-toxic oxygen gas, but itself is toxic, so it is preferable that the ozone concentration be as low as possible. It is also clear that it is easy to produce ozone water having a low ozone concentration. Therefore, ozone water having a low ozone concentration and high cleaning efficiency is preferable, but this point is not disclosed at all in Patent Document 1.

  On the other hand, in Patent Document 2, it has been clarified that the bactericidal effect is particularly enhanced by setting the bubble diameter in the above range. However, in order to produce this ozone water, complicated processes and operations such as adding an electrolyte to adjust the electrical conductivity of the water itself and applying ultrasonic waves are necessary. In addition, although the sterilizing effect is enhanced, it is also clear that the presence of an additive substance in water is not suitable for cleaning for purposes other than sterilization. Therefore, this condition is intended only for sterilization, and is not suitable for, for example, general clothing cleaning or semiconductor wafer cleaning.

  That is, in the cleaning apparatus using ozone water, ozone water having particularly high cleaning efficiency can be easily obtained, and it has been difficult to obtain a cleaning apparatus having high cleaning efficiency using this.

  The present invention has been made in view of such problems, and an object thereof is to provide an invention that solves the above problems.

In order to solve the above problems, the present invention has the following configurations.
SUMMARY OF THE INVENTION according to claim 1 is a microbubble generator ozone water producing apparatus for forming ozone gas as microbubbles in water by circulating water and ozone gas, the microbubble generator has one end the A discharge port through which water to be circulated is introduced and has a structure in which the other end is closed and is connected to the main body pipe disposed in the water, and a gas that introduces ozone gas into the main body pipe Ozone water generation characterized by comprising a slit formed with an inclination angle with respect to a line connecting a supply pipe and one end and the other end of the main body pipe, and communicating between the inside of the main body pipe and the outside water Exists in the device.
The gist of the invention described in claim 2 resides in the ozone water generating apparatus according to claim 1, wherein a plurality of the slits are formed with substantially the same inclination angle.
The gist of the invention described in claim 3 resides in the ozone water generator according to claim 1 or 2, wherein the inclination angle is in a range of 30 ° to 90 ° toward the one end side. .
SUMMARY OF THE INVENTION according to claim 4 is the ozone water generating method for forming a ozone gas in water by circulating water and ozone gas in the microbubble generator as microbubbles, the discharge port is provided at one end, the other end A main body pipe having a closed structure is disposed in the water, the water to be circulated is introduced into the main body pipe from the one end, and ozone gas is supplied to the main body pipe using negative pressure due to the water flow in the main body pipe. Microbubbles of water and ozone gas to be circulated from a slit having an inclination angle with respect to a line connecting one end and the other end of the main body pipe and communicating between the inside of the main body pipe and the outside water The ozone water generation method is characterized in that the ozone water is generated by releasing water into the water.
SUMMARY OF THE INVENTION according to claim 5, generates ozone water according a plurality of the slits formed with a said angle of inclination of substantially the same to claim 4, characterized in that to release microbubbles of the ozone gas in water Lies in the way.
The gist of the invention described in claim 6 resides in the ozone water generation method according to claim 4 or 5, wherein the inclination angle is in a range of 30 ° to 90 ° toward the one end side. .
SUMMARY OF THE INVENTION according to claim 7 is introduced ozone water generated by ozone water generating apparatus according to any one of claims 1 to 3, the object to be cleaned is immersed in the ozone water The present invention resides in a cleaning apparatus including a cleaning tank having a structure as described above.
The gist of the invention described in claim 8 resides in the cleaning apparatus according to claim 7, wherein the cleaning tank does not include a rotation mechanism and a stirring mechanism.
The gist of the invention described in claim 9 is that the object to be cleaned is any one of clothing, vegetables, metal parts, and semiconductor wafers. It exists in the cleaning device.
The gist of the invention described in claim 10 is that ozone water generated by the ozone water generating method according to any one of claims 4 to 6 is introduced into a cleaning tank, and the ozone water is cleaned. The present invention resides in a cleaning method characterized by immersing an object.

  Since the present invention is configured as described above, in a cleaning apparatus using ozone water, ozone water having particularly high cleaning efficiency can be easily obtained, and a cleaning apparatus having high cleaning efficiency can be obtained using this. Obtainable.

(First embodiment)
The first embodiment of the present invention is an ozone water generator that generates ozone water that dissolves ozone or contains a large number of fine bubbles of ozone.

The configuration of the ozone water generator 10 is shown in FIG. The ozone water generator includes an ozone generator 11 and a microbubble generator 12. Oxygen (O ₂ ) gas is supplied to the ozone generator 11 from an oxygen cylinder 13 through an oxygen supply valve 14 and an oxygen flow meter 15. The oxygen supply valve 14 controls the on / off of the oxygen gas, and the oxygen flow meter 15 monitors and controls the flow rate of the oxygen gas, thereby controlling the flow rate of the ozone gas. The microbubble generator 12 immersed in the water 30 is supplied with water by the pump 16 and simultaneously with the ozone gas generated by the ozone generator 11. As a result, water and ozone gas are circulated in the microbubble generator 12 in the inside, and the ozone gas is discharged into the water 30 in the form of many small bubbles (microbubbles) in the water. At this time, a part of the ozone gas is dissolved in water, and the other is left in the water 30 as ozone bubbles, or is released from the surface of the water 30 to the atmosphere. That is, the water 30 becomes ozone water. At this time, the smaller the bubble size, the greater the probability that it will remain in the water 30, and the rate of release to the air will decrease. That is, ozone water containing a large amount of ozone can be generated. In FIG. 1, since the description is simplified, water is supplied to the microbubble generator 12 from the left side and ozone is supplied from the right side, but these are actually supplied. The direction is the direction shown in FIG. Moreover, although the pump 16 is installed outside the tank in which the water 30 is stored, this configuration is optional as long as the water can be circulated through the microbubble generator 12.

As the ozone generator 11, any device can be used, for example, a silent discharge type device can be used. In this configuration, a silent discharge is generated between a pair of electrodes, and oxygen (O ₂ ) gas therebetween is ionized and recombined to generate ozone (O ₃ ) gas. The gas sent from the ozone generator 11 to the microbubble generator 12 does not need to be 100% ozone, and may have an ozone concentration of about 1000 ppm, for example. However, as will be described later, according to the ozone water generating apparatus of the present invention, since the ozone generation efficiency in ozone water can be increased, this concentration can be set to 100 ppm or less. In this case, the concentration of ozone is determined by the flow rate of oxygen and the setting of the ozone generator 11 (for example, the potential between electrodes).

In ozone water, OH radicals and O ₂ ⁻ (superoxide ions) are generated by the reaction between OH ⁻ ions in water (H ₂ O) and ozone. Since these chemical substances have particularly strong oxidizing power, they have a high bactericidal action, deodorizing action, and organic substance removing action.

  Here, in the ozone water generating apparatus 10, a slit-type microbubble generating apparatus is used as the microbubble generating apparatus 12. This microbubble generator is the same as that described in Japanese Patent Application Laid-Open No. 2005-334869 (hereinafter, Patent Document 3). A schematic cross-sectional view of the configuration of the microbubble generator 12 is shown in FIG. In the microbubble generator 12, a discharge port 122 is provided at one end of the main body pipe 121, and the other end is closed by providing a collision wall 123. Water 30 flows into the main body pipe 121 from the discharge port 122. The main body pipe 121 is disposed in water which is ozone water, and is made of acrylic having an inner diameter of about 10 mm, for example. A plurality of slits 124 are formed in the lower part of FIG. The slit 124 communicates the inside of the main body pipe with the outside water, and extends from the direction (horizontal direction in FIG. 2) connecting the discharge port 122 and the collision wall 123 toward the discharge port 122 to the discharge port 122 side. In contrast, they are formed in parallel at an inclination angle θ. The width of the slit is, for example, about 0.5 mm. Further, a gas supply pipe 125 is provided in communication with the main body pipe 121 on the side closer to the discharge port 122 than the slits 124 (upstream side with respect to the water flow), from which ozone gas (gas) flows into the water flow. The main pipe 121 is introduced by the negative pressure due to the above. That is, the ozone water generator 10 operates by driving the pump 16 and circulating water through the microbubble generator 12. In FIG. 2, the slit 124 is formed below, but the slit 124 is not limited to this as long as the same effect can be obtained, and may be formed above, for example.

  As described in Patent Document 3, the microbubble generator 12 operates as a shear type microbubble generator. That is, when water is introduced into the main body pipe 121 from the discharge port 122 by the pump 16, gas (ozone gas) is introduced from the gas supply pipe 125 due to the negative pressure caused by the water flow, and bubbles in the main body pipe 121 are formed. . The bubbles are finely sheared at the entrance of the slit 124 in the main body pipe 121 to become fine bubbles (microbubbles) and are discharged into the water simultaneously with water from the tip of the slit 124. As described in Patent Document 3, the microbubble generator 12 can effectively generate a large number of bubbles having a diameter smaller than 100 μm, with this simple configuration. At this time, it is preferable to provide the gas supply pipe 125 on the upper side in the vertical direction and the slit 124 on the lower side. With this configuration, microbubbles can be generated efficiently and diffused widely in the water 30.

  The number of slits 124 is arbitrary, but a larger number is preferable because microbubbles can be generated efficiently.

  Accordingly, if the microbubble generator 12 is disposed in the water 30 and the pump 16 is operated to circulate the water, the water 30 becomes ozone water. That is, there are microbubbles made of a large number of ozone gases in the water 30. Some of them dissolve in water. Therefore, the ozone concentration with respect to the entire water can be increased. The ozone concentration can be increased by increasing the flow rate of water by the pump 16 and the operation time thereof.

  The inventor examined the cleaning effect on clothes using the ozone water generated by the ozone water generating apparatus 10 having the above configuration. In particular, the inclination angle θ of the slit 124 has a great influence on the cleaning effect. I found out. The experimental results will be described below.

Here, the degree of contamination removal when the cloth soaked in coffee and soaked in water 30 (ozone water) in the form of FIG. 1 and left without rotation and stirring was examined. In this case, the oxygen flow rate is 40 ml / min, and the water temperature is 8 ° C. Water is general tap water having an electrical resistivity of about 0.004 to 0.015 × 10 ⁶ Ω · cm, and the resistivity is not particularly adjusted. For the inclination angle θ of the slit 124, two types of 30 ° and 60 ° were used. Moreover, although observation was performed for 40 minutes after operating the pump 16, the pump 16 was operated only for 0 to 20 minutes and stopped for 20 to 40 minutes.

  FIG. 3 shows the appearance of the sample before the treatment, and FIGS. 4A to 4D show the observation results of the surface of the fabric when θ is 30 °, respectively at 10, 20, 30, and 40 minutes. Yes, FIGS. 5A to 5D are observation results of the surface of the fabric when 10, 20, 30, and 40 minutes have elapsed when θ is 60 °, respectively. From this result, it is clear that in both cases, the dirt is removed with the passage of time. That is, it can be confirmed that organic contamination is removed using the ozone water generated using the ozone water generator 10. However, when θ is 60 °, the contamination is almost removed after 20 minutes (FIG. 5B), whereas when it is 30 °, the contamination is sufficient even after 30 minutes (FIG. 4C). It has not been removed. Therefore, when θ is 60 °, the effect is greater than when 30 °, and it can be confirmed that the cleaning ability is high.

  Since it is clear that the ozone concentration in the ozone water greatly affects the cleaning effect, the ozone concentration in the ozone water was measured according to the passage of time. The ozone measured here is the sum of the microbubbles present in water and those dissolved in water. Measurement was performed by absorptiometry. The measurement results are shown in FIG. The ozone concentration at the start of the operation is zero, regardless of the value of θ, the ozone concentration increases until 20 minutes after the operation of the microbubble generator 12, and after 20 minutes after the stop, Although the concentration decreases, it remains sufficiently. However, the absolute value of the ozone concentration is higher at θ = 60 ° at any time.

  Based on the result of FIG. 6, the difference in the cleaning effect when the ozone concentration was the same between the two was examined in the same manner. That is, the oxygen flow rate when θ = 30 ° is 40 ml / min, and the oxygen flow rate when θ = 60 ° is 24 ml / min. The results when θ = 30 ° in this case are FIGS. 7A to 7D, and the results when θ = 60 ° are FIGS. 8A to 8D. FIG. 9 shows the result of measuring the ozone concentration in the same manner as in FIG. 5, but it can be confirmed that the ozone concentration is almost the same between the two regardless of the elapsed time. That is, the ozone concentration could be made substantially the same by setting the oxygen flow rate as described above.

  However, also in this result, as in the case of FIGS. 4 and 5, a better result was obtained when θ = 60 °. That is, when θ is 60 °, the contamination is almost removed after 20 minutes (FIG. 8B), whereas when it is 30 °, after 30 minutes (FIG. 7C). ) But not removed. Therefore, the higher cleaning effect is obtained when θ = 60 ° not only because a high ozone concentration is obtained but also due to other factors.

  For this reason, the state of the microbubble of ozone in ozone water was investigated from two viewpoints here. One is the bubble diameter of the microbubble, and the other is the potential of the microbubble (zeta potential).

  First, FIG. 10 shows the measurement results of the bubble size distribution of microbubbles when θ = 30 ° and 60 °. Here, the vertical axis represents the existence probability density, and the horizontal axis represents the measured bubble diameter, and the measurement was performed by the light transmittance method and the microscope method. In both cases, microbubbles having a bubble diameter of 100 μm or less are effectively generated, but when 30 °, the distribution is relatively flat, whereas when θ = 60 °, Compared to the case of 30 °, it can be confirmed that the ratio of those having a bubble diameter of 60 μm or less is particularly high.

  Therefore, when θ = 60 °, the number of microbubbles having a small bubble diameter increases. That is, many fine ozone microbubbles are generated.

  On the other hand, FIG. 11 shows the results of measuring the zeta potential of microbubbles when θ = 30 ° and 60 °. Here, the horizontal axis is the range of the bubble diameter, and the zeta potential in the range of each bubble diameter was measured. The measurement was performed by electrophoresis. From this result, it is clear that the case of θ = 60 ° has a larger zeta potential on the negative side regardless of the bubble diameter. In general, in a shear type microbubble generator, it is known that a large zeta potential is applied to bubbles (microbubbles), but a large zeta potential is obtained particularly when θ = 60 °. .

  That is, the microbubble generating device 12 can obtain fine ozone microbubbles having a large zeta potential. This effect is particularly great when θ is 60 °.

  From the result of FIG. 9, the ozone concentration of the ozone water is as low as about 1 mg / L and has the above-described high cleaning efficiency. From the above results, the following points can be considered as reasons for the high cleaning efficiency at such a low ozone concentration. First, as described above, since the microbubbles of ozone generated by the microbubble generator 12 are particularly fine, they can particularly stay in water for a long time. At this time, since the mass transfer at the interface and the bursting of the micro bubbles gradually progress, ozone is easily dissolved in water, and the chemical substance having a high cleaning effect is efficiently generated. In addition, the microbubbles are likely to gather near the object to be cleaned due to the electrostatic force due to the zeta potential, and in particular, ozone is likely to be released into the water in this vicinity. In the above, when the ozone water is generated, the ozone concentration in the gas charged into the microbubble generator 12, that is, the gas generated in the ozone generator 11, is a low concentration of 100 ppm or less. Thus, by using this microbubble generator 12, it is possible to generate ozone water having a high ozone concentration and high cleaning efficiency.

  From the above results, it was confirmed that the ozone water generated by the ozone generator 10 using the microbubble generator 12 has high cleaning efficiency in the range of θ of 30 to 60 °. In addition, a large cleaning effect can be obtained by setting θ to 60 ° or more. In addition, since it becomes difficult to generate | occur | produce a microbubble effectively when (theta) becomes larger than 90 degrees, the range of especially preferable (theta) is 60-90 degrees. That is, the ozone water generating apparatus 10 having this configuration can generate ozone water having a particularly large cleaning effect, and a cleaning apparatus having high cleaning efficiency can be obtained using this.

  At this time, what is characteristic of the ozone water generating apparatus 10 is a microbubble generator 12. As shown in FIG. 2, the structure of the microbubble generator 12 is simple and can be manufactured at low cost. That is, ozone water having high cleaning efficiency can be easily generated.

  Moreover, in said experiment, when ozone concentration was made constant, this ozone water was shown to have a high cleaning effect with respect to the organic contamination by coffee. This ozone water is also effective against other types of pollution. FIG. 12 is a photograph of external appearances before and after the above-described ozone water generating apparatus 10 is operated in this water by putting contaminated water in an emulsion state in which water and oil are mixed into a transparent water tank (a: before operation, b: 30 minutes after the operation). Here, in order to determine the transparency, a white fabric with a graphic is placed outside the transparent aquarium. As a result, it can be confirmed that the oil contamination is removed after 30 minutes and the transparency of water is improved.

  Therefore, it can be confirmed that the ozone water generated by the ozone water generating apparatus 10 is effective against organic contamination by coffee or oil. Furthermore, the fact that a chemical substance having a high cleaning effect is particularly effectively generated and acts due to the small size of the microbubbles and the effect of the zeta potential is the same for other actions. Therefore, it is clear that this ozone water is effective for sterilization and deodorization.

(Second Embodiment)
The second embodiment of the present invention is a cleaning device using the ozone water generating device. A schematic configuration of this cleaning apparatus is shown in FIG.

  In the cleaning device 40, the ozone water generation device 10 is used, and the microbubble generation device 12 is provided in the ozone water generation tank 41, and the pump 16 is provided outside the microbubble generation device 12. Water is introduced into the ozone water generation tank 41 with the water supply valve 42 open, the microbubble generator 12 is immersed in water, and the pump 16 operates to generate ozone water as described above. When the ozone water supply valve 43 is opened, the ozone water is guided to the cleaning tank 44 and collected therein, and the object to be cleaned 45 is immersed in the ozone water. In the washing tank 44, the rotation / stirring mechanism used in a normal washing apparatus (washing machine) is not used. Further, the cleaning tank 44 is provided with a drain 46, and ozone water is appropriately discharged. Thereafter, new ozone water is generated again and supplied through the ozone water supply valve 43.

  The cleaning tank 44 is used for cleaning the object to be cleaned 45 after the ozone water generated in the ozone water generating tank 41 is stored. That is, here, the ozone water once generated is used in a tank different from the ozone water generation tank 41. Even in this case, the ozone concentration in the ozone water is sufficient from the results shown in FIGS. 6 and 9, and thus a sufficient cleaning effect can be obtained.

  The object to be cleaned 45 is a cloth contaminated with coffee in the above example, but is optional. In particular, contamination by organic substances can be effectively removed by the effect of ozone. Further, as the object to be cleaned 45, for example, in addition to clothing (cloth), vegetables, metal parts, semiconductor wafers, etc., particularly those that are not adversely affected by ozone, this can be cleaned.

  Here, the cleaning object 45 is cleaned by immersing the cleaning object 45 in ozone water in the cleaning tank 44. In particular, since this ozone water has a high cleaning effect as described above, the cleaning device 40 has a high cleaning efficiency. That is, it is effective for removal of organic contamination, sterilization, deodorization and the like.

  Further, as described above, when this ozone water is used, a great cleaning effect can be obtained without rotating and stirring the ozone water and the object to be cleaned 45, so the cleaning tank 44 is provided with a rotation mechanism and a stirring mechanism. There is no need. In this case, the power consumption of the cleaning device 40 can be reduced. Further, the cleaning tank 44 can be made of metal or plastics, but since the object to be cleaned 45 does not collide with the inner wall, its life can be extended.

  However, in order to obtain a higher cleaning effect, a rotation / stirring mechanism may be provided to rotate / stir the ozone water or the object 45 to be cleaned. Even in this case, when this ozone water is used, a high cleaning effect can be obtained even if this rotation / stirring is weaker than that in the case where this ozone water is not used or is performed in a short time.

In the case of cleaning using a detergent, it is essential to perform normal water rinsing after cleaning in order to prevent the detergent from remaining on the object to be cleaned. However, the ozone used in place of the detergent in the cleaning device 40 naturally changes to oxygen (O ₂ ) gas and desorbs into the air, so that it is not necessary to perform rinsing. However, in order to more strongly remove contamination, the ozone water is drained from the drain 46 after cleaning with ozone water, and then normal water is introduced into the cleaning tank 44. After that, rinsing is performed after cleaning with ozone water. Can also be performed.

  Further, the cleaning tank 44 and the ozone water generation tank 41 can be used together, and the generation and cleaning of the ozone water can be performed simultaneously or continuously in one tank. In this case, the cleaning device 40 is made smaller. Can be However, depending on the shape and quantity of the object to be cleaned 45, it may be difficult to form microbubbles uniformly when the object to be cleaned 45 is immersed in water. In this case, uniform cleaning is difficult. Therefore, it is preferable to provide these tanks separately. In addition, since there are a large number of objects to be cleaned 45, when performing a plurality of times of cleaning continuously, by separately providing these tanks, cleaning is performed in the cleaning tank 44 and at the same time an ozone water generation tank Since it is possible to produce | generate ozone water separately by 41, it is efficient.

  Note that it is not necessary to exchange this ozone water for each cleaning. As described above, since ozone microbubbles and molten ozone in the ozone water contribute to the cleaning effect, a high cleaning effect can be obtained as long as they remain sufficiently in the ozone water. Therefore, in this case, the amount of water used for cleaning can be saved.

For example, when clothing is used as the object to be cleaned 45, it is necessary to dry it after cleaning. Ozone has a peculiar odor and is toxic, so it is not desirable that ozone remain in clothing, but ozone also vaporizes simultaneously with moisture during drying, and changes to non-toxic, odorless oxygen (O ₂ ) gas. It doesn't matter.

  Moreover, unlike the washing water using a detergent, the ozone water has little adverse effect on the environment. This is because, as described above, ozone naturally changes to nontoxic oxygen gas. Therefore, it is not necessary to perform a special process (detoxification process) on the wastewater discharged through the drain 46 after cleaning.

  Further, for example, small dust attached to clothing is removed by attaching to microbubbles in ozone water. This effect becomes remarkable particularly when the microbubble has a high zeta potential as described above and a large electrostatic force is generated.

  The form of the cleaning tank 42 is arbitrary, but in order to reduce the amount of ozone with a specific odor leaking to the outside or to suppress the desorption of ozone from the ozone water, a lid is provided and sealed. Is preferred. Further, it is preferable that an exhaust mechanism is provided so that the cleaning tank 42 is exhausted immediately before the user opens the lid after ozone water is drained from the drain 46.

  In the above experiment, the water temperature was 8 ° C., but in order to obtain a greater cleaning effect, it is more preferable to adjust the water temperature with a heater or the like to be in the range of 4 to 16 ° C. This temperature adjustment can be performed in the ozone water generation tank 41 or in the cleaning tank 44.

  FIG. 14 shows the result of cleaning the fabric soaked with curry using this cleaning device 40. Here, FIG. 14A is an appearance photograph of the sample before cleaning, FIG. 14B is an appearance photograph after being immersed in ozone water generated in θ = 60 ° for 30 minutes in the cleaning tank 44, and FIG. 14C is ozone gas. It is the external appearance photograph after being immersed on the same conditions in the water which bubbled air on the same conditions instead of. The water in (c) contains many air microbubbles. Although the cleaning effect is also observed in (c), the cleaning efficiency is clearly high in (b) using ozone water.

  With the above configuration, the cleaning device 40 can clean various objects to be cleaned that are inexpensive and have high cleaning efficiency and are not adversely affected by ozone. In particular, it is effective for removal of organic contamination, sterilization, deodorization and the like.

  Similarly, if this ozone water generating device 10 is installed in a pool, for example, it is useful for disinfecting the pool water or the pool itself.

It is a figure which shows the structure of the ozone water production | generation apparatus used as the 1st Embodiment of this invention. It is a schematic sectional drawing which shows the structure of the microbubble generator used in the 1st Embodiment of this invention. It is the external appearance photograph before washing | cleaning of the cloth contaminated with coffee used in experiment. It is the result of investigating the immersion time dependency of the appearance of the immersed fabric when the oxygen flow rate is 40 mL / min and θ = 30 °. It is the result of investigating the immersion time dependency of the appearance of the immersed fabric when the oxygen flow rate is 40 mL / min and θ = 60 °. It is the result of having measured the elapsed time dependence of the ozone concentration of ozone water when an oxygen flow rate is 40 mL / min in the case of θ = 30 ° and 60 °. It is the result of measuring the immersion time dependency of the appearance of the immersed fabric when the ozone concentration is substantially the same as when θ = 60 ° and θ = 30 °. It is the result of investigating the immersion time dependence of the appearance of the immersed fabric when the ozone concentration is substantially the same as when θ = 30 ° and θ = 60 °. It is the result of having measured the elapsed time dependence of the ozone concentration of the ozone water used in the measurement of FIG. It is the result of having measured the bubble diameter distribution of the microbubble in the ozone water produced | generated in the case of (theta) = 30 degrees and 60 degrees. It is the result of having measured the distribution of the zeta potential of the microbubble in the ozone water produced | generated in the case of (theta) = 30 degrees and 60 degrees. It is the result (a: before application, b: after application) which applied the ozone water generator which becomes the 1st Embodiment of this invention with respect to the oil pollution of water. It is a figure which shows the structure of the washing | cleaning apparatus used as the 2nd Embodiment of this invention. It is a result (a: before washing | cleaning, b: after ozone water washing | cleaning, c: after washing | cleaning using air instead of ozone) which shows the washing | cleaning effect by the washing | cleaning apparatus used as the 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Ozone water generator 11 Ozone generator 12 Micro bubble generator 13 Oxygen cylinder 14 Oxygen supply valve 15 Oxygen flow meter 16 Pump 30 Water (ozone water)
40 Cleaning device 41 Ozone water generation tank 42 Water supply valve 43 Ozone water supply valve 44 Cleaning tank 45 Object to be cleaned 46 Drain 121 Body pipe 122 Discharge port 123 Collision wall 124 Slit 125 Gas supply pipe

Claims (10)

An ozone water generator that circulates water and ozone gas in a microbubble generator to form ozone gas as microbubbles in water,
The microbubble generator is
One end is a discharge port through which the circulated water is introduced, the other end is closed, and a main body pipe disposed in water,
A gas supply pipe communicating with the main body pipe and introducing ozone gas into the main body pipe;
An ozone water generating apparatus, comprising a slit formed at an inclination angle with respect to a line connecting one end and the other end of the main body pipe and communicating the inside of the main body pipe with the outside water.   The ozone water generating apparatus according to claim 1, wherein a plurality of the slits are formed with substantially the same inclination angle.   The ozone water generating apparatus according to claim 1, wherein the inclination angle is in a range of 30 ° to 90 ° toward the one end side. A method for generating ozone water in which water and ozone gas are circulated through a microbubble generator to form ozone gas as microbubbles in water,
A main body pipe having a structure in which a discharge port is provided at one end and the other end is closed is placed in water, and the water to be circulated into the main body pipe is introduced from the one end,
Introducing ozone gas into the main body pipe using negative pressure due to water flow in the main body pipe,
The circulating water and ozone gas microbubbles are discharged into water from a slit having an inclination angle with respect to a line connecting one end and the other end of the body pipe and communicating the inside of the body pipe with the outside water. By
A method for producing ozone water, comprising producing the ozone water.   5. The ozone water generation method according to claim 4, wherein microbubbles of the ozone gas are discharged into water from the plurality of slits formed with substantially the same inclination angle.   The ozone water generation method according to claim 4 or 5, wherein the inclination angle is set in a range of 30 ° to 90 ° toward the one end side.   A cleaning tank having a structure in which the ozone water generated by the ozone water generating device according to any one of claims 1 to 3 is introduced and an object to be cleaned is immersed in the ozone water is provided. Characteristic cleaning device.   The cleaning apparatus according to claim 7, wherein the cleaning tank does not include a rotation mechanism and a stirring mechanism.   The cleaning apparatus according to claim 7 or 8, wherein the object to be cleaned is any one of clothing, vegetables, metal parts, and semiconductor wafers.   A cleaning method comprising introducing ozone water generated by the ozone water generating method according to any one of claims 4 to 6 into a cleaning tank and immersing an object to be cleaned in the ozone water. .