Ozone water storage tank and ozone water generator

Abstract

This invention provides a technology that can help suppress residual bubbles in ozonated water stored in a storage tank from being released to the outer periphery of the storage tank. [Solution] In the tank section T1 for storing ozonated water, a first circumferential wall W1 having a cylindrical inner wall surface W1a is erected on the bottom wall section 11, and a flow straightening section capable of encouraging a change in the direction of swirling flow is provided at a position between the upper end of the inner wall surface W1a and the bottom wall section 11. The tank section T1 has a stepped surface 10 formed at a position between the upper end of the inner wall surface W1a of the first circumferential wall W1a and the bottom wall section, which protrudes radially inward from that position and extends in the circumferential direction of the inner wall surface W1a and faces upward. An ozonated water introduction section 4 is provided on the upper first circumferential wall section 13 of the first circumferential wall W1, which is above the stepped surface 10, and an ozonated water outlet section 5 is provided on the bottom wall section 11.

Description

Technical Field

[0001] The present invention relates to a technology that can contribute to a storage tank and a generation device for ozone water.

Background Art

[0002] Ozone water obtained by dissolving ozone in a solvent (for example, raw water such as pure water) has a strong oxidizing power. Therefore, in addition to being used in fields such as cleaning, decontamination, and disinfection, attempts have been made to use it in various fields. The use of such ozone water is evaluated as an environmentally friendly means because ozone is easily decomposed into oxygen in the end and does not leave residual chemicals or the like.

[0003] As a device for generating ozone water, there is known a configuration having a circulation line that circulates a solvent capable of dissolving ozone gas, a gas-liquid mixer capable of dissolving ozone gas in the solvent in the circulating state of the circulation line to generate ozone water, and a storage tank capable of introducing the ozone water generated by the gas-liquid mixer for storage and discharging the stored ozone water to the circulation line (refluxing to the upstream side of the gas-liquid mixer) (for example, Patent Documents 1 and 2).

[0004] In the storage tank, there is known an aspect having a tank portion in which a peripheral wall having a cylindrical inner wall surface stands upright on a bottom wall portion, an ozone water introduction portion for introducing ozone water into the tank portion, and an ozone water discharge portion for discharging the ozone water stored in the tank portion to the outer peripheral side of the tank portion.

[0005] Bubbles may be formed in the ozone water before and after the storage in the storage tank and may remain as they are. The bubbles remaining in the ozone water in this way may cause a decrease in the water quality (for example, ozone concentration) of the ozone water, which is not preferable. Further, when the ozone water with bubbles remaining is discharged to the circulation line, there is a risk of affecting the circulation line (for example, affecting the gas-liquid mixer).

[0006] Therefore, in the storage tank described in Patent Document 1, a configuration has been considered in which ozonated water introduced from the ozonated water introduction section is introduced along the inner wall surface of the peripheral wall in the circumferential direction of the peripheral wall (hereinafter, as appropriate, simply referred to as the circumferential direction), thereby forming a swirling flow of ozonated water (hereinafter, as appropriate, simply referred to as the swirling flow) within the tank.

[0007] It is believed that by forming such a swirling flow, bubbles remaining in the ozonated water (for example, relatively fine bubbles) are attracted to the axis of the swirling flow and aggregate, making it easier for these aggregated bubbles to rise to the surface (for example, as relatively coarse bubbles). [Prior art documents] [Patent Documents]

[0008] [Patent Document 1] Patent No. 6954645 [Patent Document 2] Japanese Patent Publication No. 2024-090631 [Overview of the project] [Problems that the invention aims to solve]

[0009] In a storage tank as shown in Patent Document 1, when ozonated water from the tank is discharged from the ozonated water outlet while a swirling flow is formed, the ozonated water flows toward the ozonated water outlet while swirling along the inner wall surface of the peripheral wall.

[0010] Therefore, bubbles remaining in the ozonated water are not only attracted towards the axis of the swirling flow, but are also attracted towards the ozonated water outlet, and there is a risk that they may be discharged along with the ozonated water to the outer circumference of the tank.

[0011] The present invention has been made in view of the above circumstances, and aims to provide a technology that can contribute to suppressing residual bubbles in ozonated water stored in a storage tank from being led out to the outer periphery of the storage tank. [Means for solving the problem]

[0012] The ozone water storage tank and generating device according to this invention can contribute to solving the above-mentioned problems, and in one embodiment of the storage tank, a first circumferential wall having a cylindrical inner wall surface is erected on the bottom wall, and the tank portion is capable of storing ozone water on the inner wall surface side of the first circumferential wall, a stepped surface that protrudes radially inward from a position between the upper end of the inner wall surface of the first circumferential wall and the bottom wall, extends in the circumferential direction of the inner wall surface and faces upward, an ozone water introduction portion provided on the upper first circumferential wall portion of the first circumferential wall which is above the stepped surface, and introduces the ozone water to one side in the circumferential direction along the inner wall surface of the upper first circumferential wall portion, and an ozone water discharge portion provided on the bottom wall portion which discharges the stored ozone water to the outer circumference of the tank portion.

[0013] In the above embodiment, the stepped surface may be characterized by having a tapered shape that is biased upward from the outer side in the radial direction towards the inner side.

[0014] Furthermore, a partition wall is provided on the inner circumference of the stepped surface, having a shape that extends radially along the stepped surface, and the partition wall may be characterized by having one or more through holes that penetrate in the vertical direction.

[0015] Furthermore, the ozone water introduction section may be characterized by having a protruding portion that extends from the inner wall surface of the upper first circumferential wall, and by having a discharge port that opens to one side in the circumferential direction on one side of the protruding portion.

[0016] Furthermore, the upper first peripheral wall portion may be characterized by the provision of piping for introducing one or more of the following into the tank portion: inert gas, carbon dioxide, or low-concentration ozone gas.

[0017] Further, an exhaust pipe for exhausting the gas in the tank portion to the outer peripheral side of the tank portion may be provided on the upper side first peripheral wall portion.

[0018] One aspect of the generating device includes a circulation line for circulating a solvent capable of dissolving ozone gas, a control unit for controlling the circulation flow rate of the solvent, a gas-liquid mixer through which the solvent flows in a circulating state in which the solvent circulates and the ozone gas is supplied at an arbitrary supply pressure, and a storage tank for the ozone water.

Advantages of the Invention

[0019] As described above, according to the present invention, it is possible to contribute to suppressing the bubbles remaining in the ozone water stored in the storage tank from being led out to the outer peripheral side of the storage tank.

Brief Description of the Drawings

[0020] [Figure 1] Schematic diagram for explaining the main configuration of the storage tank T11 according to Example 1 ((A) is a view facing from the horizontal direction, (B) is a view facing the inside of the tank portion T1 from the upper side with the upper wall portion 12 removed). [Figure 2] Schematic diagram for explaining the introduction / derivation state of ozone water in the storage tank T11 (a diagram corresponding to FIG. 1(A)). [Figure 3] Schematic diagram for explaining the main configuration of the generating device 6 (a diagram when the storage tank T11 is applied). [Figure 4] Schematic diagram for explaining the main configuration of the storage tank T12 according to Example 2 ((A) is a view facing from the horizontal direction, (B) is a view facing the inside of the tank portion T1 from the upper side with the upper wall portion 12 removed). [Figure 5] Schematic diagram for explaining the main configuration of the storage tank T13 according to Example 3 ((A) is a view facing from the horizontal direction, (B) is a view facing the inside of the tank portion T1 from the upper side with the upper wall portion 12 removed). [Figure 6]Schematic diagram for explaining the main configuration of the storage tank T14 according to Example 4 ((A) is a view facing from the horizontal direction, (B) is a view facing the inside of the tank portion T1 from above after removing the upper wall portion 12). [Figure 7] Schematic diagram for explaining the main configuration of the storage tank T21 according to Example 5 ((A) is a view facing from the horizontal direction, (B) is a view facing the inside of the tank portion T2 from above after removing the upper wall portion 12). [Figure 8] Schematic diagram for explaining the introduction / derivation state of ozone water in the storage tank T21 (a diagram corresponding to FIG. 7(A)). [Figure 9] Schematic diagram for explaining the main configuration of the storage tank T22 according to Example 6 ((A) is a view facing from the horizontal direction, (B) is a view facing the inside of the tank portion T2 from above after removing the upper wall portion 12). [Figure 10] Schematic diagram for explaining the main configuration of the storage tank T23 according to Example 7 ((A) is a view facing from the horizontal direction, (B) is a view facing the inside of the tank portion T2 from above after removing the upper wall portion 12). [Figure 11] Schematic diagram for explaining a configuration example of the third peripheral wall W3 of the storage tank T23 (a view facing from the horizontal direction). [Figure 12] Schematic diagram for explaining a configuration example of the third peripheral wall W3 of the storage tank T23 (a view facing from the horizontal direction). <00​​​​​​​​​​​​​One example of a tank section equipped with a flow straightening section (for example, tank section T1 in embodiments 1 to 4 described later) is one in which a stepped surface (for example, stepped surface 10 in embodiments 1 to 4 described later) is formed at a position between the upper end of the inner wall surface of the first circumferential wall and the bottom wall, projecting radially (hereinafter simply referred to as radially) inward from that position, extending in the circumferential direction of the inner wall surface and facing upward. In this example, an ozonated water introduction section is provided on the upper first circumferential wall section above the stepped surface of the first circumferential wall, and an ozonated water outlet section is provided on the bottom wall. By introducing ozonated water from the ozonated water introduction section along the inner wall surface of the first circumferential wall to one or the other side in the circumferential direction, the stepped surface functions as a flow straightening section.

[0024] Furthermore, another example of a tank section equipped with a flow straightening section (for example, tank section T2 in embodiments 5 to 7 described later) is an embodiment in which a first circumferential wall having a cylindrical inner wall surface and a second circumferential wall having a smaller diameter and cylindrical inner wall surface and being coaxially arranged on the inner wall surface side of the first circumferential wall are erected on the bottom wall. The second circumferential wall has a shorter dimension in the vertical direction (i.e., the vertical direction; hereafter, either the vertical direction or the vertical direction will be appropriately applied depending on the content of the explanation) than the first circumferential wall, and a second circumferential wall opening is provided that opens upward along the inner wall surface of the second circumferential wall. In this other embodiment, an ozonated water introduction section is provided on the inner wall surface side of the second circumferential wall on the bottom wall, and an ozonated water outlet section is provided between the first circumferential wall side and the second circumferential wall side on the bottom wall. Then, by introducing ozonated water from the ozonated water introduction section along the inner wall surface of the second peripheral wall to one or the other side in the circumferential direction, the opening of the second peripheral wall functions as a flow straightening section.

[0025] In a storage tank equipped with a flow straightening section (stepped surface or second peripheral wall opening) as in this embodiment, when swirling ozonated water passes through the flow straightening section, it is more likely that the direction of the swirling flow will be encouraged to change. When the direction of the swirling flow changes in this way, the momentum of the swirling flow is reduced (for example, the flow velocity decreases), and the ozonated water flows in the changed direction, while the bubbles in the ozonated water tend to move in the direction before the change (moving by inertia). As a result, the bubbles in the ozonated water tend to float to the surface and separate into gas and liquid, making it easier to suppress the discharge of bubbles from the ozonated water outlet.

[0026] As mentioned above, when ozonated water is introduced along the inner wall surface of the first or second circumferential wall on one side in the circumferential direction, the larger the introduction angle to the inner wall surface, the more likely it is to disperse radially when it comes into contact with the inner wall surface (hereinafter simply referred to as dispersed flow as appropriate). For example, in the case of swirling flow of ozonated water in a conventional configuration, it is conceivable that it will flow more easily downwards. Also, for example, if the amount of ozonated water introduced is increased (the flow velocity is increased) while ozonated water is being introduced, turbulence may occur in the introduced ozonated water.

[0027] On the other hand, with a configuration that includes a flow straightening section as in this embodiment, even if dispersed flow and turbulence are likely to occur in the swirling flow of ozonated water, the flow straightening section encourages a change in the direction of the swirling flow, thus making it easier to suppress such dispersed flow and turbulence.

[0028] The storage tank and generating apparatus of this embodiment may have a configuration in the tank section for storing ozonated water as described above, which includes a flow straightening section (stepped surface or second peripheral wall opening) capable of prompting a change in the direction of the swirling flow.

[0029] In other words, it is possible to appropriately apply common technical knowledge from various fields (for example, the fields of ozone gas and ozonated water generation, fluid rectification, water level gauges, etc.) and modify the design by appropriately referring to the contents disclosed in prior art documents, etc., as needed. Examples of this include Examples 1 to 7 described below. In Examples 1 to 7 described below, detailed explanations are omitted as appropriate, for example, by referring to the same reference numerals for similar contents. In addition, in the first peripheral wall W1 and the second peripheral wall W2 shown in the figures, the part on the near side of the figure is shown with a dashed line as a virtual line, and the part on the depth side of the figure is shown with a dashed line as a virtual line, so that it is easier to understand the inner wall surface W1a side of the first peripheral wall W1 and the inner wall surface W2a side of the second peripheral wall W2.

[0030] ≪Example 1≫ <Example of the main configuration of storage tank T11 according to Example 1> Figure 1 is a schematic diagram illustrating the main configuration of the storage tank T11 according to Embodiment 1. This storage tank T11 consists of a first peripheral wall W1 having a cylindrical inner wall surface W1a erected on the bottom wall portion 11, and a tank portion T1 capable of storing ozonated water is provided on the inner wall surface W1a side of the first peripheral wall W1. The upper side of the first peripheral wall W1 (inner wall surface W1a) is shielded by an upper wall portion 12 provided at the upper end.

[0031] An ozone water introduction section 4 is provided in the upper first circumferential wall section 13, which is the upper side of the first circumferential wall W1, for introducing and storing ozonated water in the tank section T1. This ozone water introduction section 4 only needs to be configured to introduce ozonated water along the inner wall surface W1a on one side in the circumferential direction. An ozone water outlet section 5 is provided in the bottom wall section 11 for guiding the ozonated water stored in the tank section T1 to the outer periphery of the tank section T1.

[0032] In the case of the first circumferential wall W1 shown in Figure 1, the lower first circumferential wall portion 14, which is the lower part of the first circumferential wall W1, is thicker radially inward than the upper first circumferential wall portion 13. As a result, a stepped surface 10 is formed at a position between the upper first circumferential wall portion 13 and the lower first circumferential wall portion 14 on the inner wall surface W1a (between the bottom wall portion 11 and the top wall portion 12). This stepped surface 10 has a shape (annular) that protrudes radially inward from that position and extends in the circumferential direction of the inner wall surface 11a, and is facing upward. The inner peripheral edge portion 10a of the stepped surface 10 may be bent upward (for example, a shape with a baffle plate).

[0033] The storage tank T11 is applied by connecting the tank section T1 to an ozone water generator 6, such as the one shown in Figure 3 below, and is used to appropriately store the ozone water generated by the generator 6 and to allow the stored ozone water to be returned to the generator 6.

[0034] In the tank section T1, for example, a measuring pipe 7 described later is provided on the outer wall surface W1b side of the first peripheral wall W1, and the amount of ozonated water introduced into the tank section T1 is adjusted as appropriate while appropriately measuring the water level of the ozonated water in the tank section T1 using the measuring pipe 7. For example, the amount of ozonated water introduced is adjusted so that the water level of the ozonated water in the tank section T1 is above the ozonated water introduction section 4.

[0035] With the storage tank T11 described above, for example, as shown by arrow Y11 in Figure 2, by introducing ozonated water from the ozonated water introduction section 4 along the inner wall surface W1a to one side in the circumferential direction, the ozonated water flows along the inner wall surface W1a to one side in the circumferential direction, and a swirling flow of the ozonated water is formed.

[0036] With this swirling flow formed, when the ozonated water from the tank section T1 is discharged to the outer periphery via the ozonated water discharge section 5 (hereinafter referred to as the ozonated water introduction / discharge state as appropriate), the ozonated water from the ozonated water introduction section 4 to the vicinity of the stepped surface 10 flows downward (towards the ozonated water discharge section 5) while swirling along the inner wall surface W1a.

[0037] The ozonated water, after reaching the stepped surface 10, is encouraged to flow radially inward along the stepped surface 10. If the inner peripheral edge 10a of the stepped surface 10 is bent upward, the water tends to flow more towards the upward side in accordance with the bend.

[0038] After passing the inner peripheral edge 10a of this stepped surface 10, the momentum of the swirling flow is reduced, and a downward flow is formed that flows downward (towards the ozone water outlet 5 side), as shown by arrow Y12 in Figure 2.

[0039] In other words, the swirling flow of ozonated water introduced from the ozonated water introduction section 4 has its direction temporarily changed at the stepped surface 10 (changed radially inward), while the bubbles in the ozonated water are in a state where they are more likely to move in the direction along the stepped surface (i.e., the direction before the change downward).

[0040] Therefore, bubbles in ozonated water (for example, relatively fine bubbles) tend to be attracted to the axis side of the swirling flow and aggregate, and these aggregated bubbles tend to float to the surface (for example, as relatively coarse bubbles) and separate into gas and liquid. In addition, it becomes easier to avoid bubbles being discharged from the ozonated water outlet 5. Furthermore, even if dispersed flow or turbulence is likely to occur in the swirling flow of ozonated water, such dispersed flow and turbulence are more easily suppressed.

[0041] <Example configuration of tank section T1> In the tank section T1, as described above, ozonated water can be introduced and stored via the ozonated water introduction section 4, and the stored ozonated water can be discharged to the outer periphery of the tank section T1 via the ozonated water discharge section 5. Various configurations can be applied.

[0042] In the case of the upper first peripheral wall portion 13 of the first peripheral wall W1 in Figure 1, a through hole 4a is provided for inserting the introduction pipe 41 of the ozone water introduction section 4, which will be described later. This through hole 4a may have a shape that penetrates at an angle inclined with respect to the thickness direction of the first peripheral wall W1 (hereinafter referred to as simply an inclined through hole), but for the reasons shown below, it is preferable to have a shape that penetrates the first peripheral wall W1 in the thickness direction.

[0043] For example, if the introduction pipe 41, described later, has a cylindrical pipe shape, and a through-hole 4a with an inclined through-hole shape is formed so that the introduction pipe 41 can be inserted through it, the opening shape of the inclined through-hole 4a will become elliptical. Processing such an inclined through-hole 4a is difficult, and even if it is possible to process it so that the introduction pipe 41 can be inserted through it, a gap is likely to be formed between the through-hole 4a and the introduction pipe 41, resulting in poor installation.

[0044] Therefore, when forming a through-hole 4a with an inclined through-shape, it is preferable to set the inclination angle so that it does not become too large.

[0045] In the case of the bottom wall portion 11 in Figure 1, a through hole 5a is provided for connecting (or inserting as in the embodiment described later) the outlet pipe 51 of the ozone water outlet portion 5 described later. This through hole 5a may also have an inclined through-hole shape, similar to the through hole 4a, but for the same reasons as described above for the through hole 4a, it is preferable that it has a shape that penetrates the bottom wall portion 11 in the thickness direction.

[0046] The through-hole 5a may not only be provided as a single hole in the bottom wall portion 11, but may also be provided in multiple locations at dispersed positions, and each of the through-holes 5a may be connected to an outlet pipe 51 of the ozone water outlet portion 5 described later.

[0047] <Example configuration of ozone water introduction unit 4> The ozonated water introduction section 4 only needs to be configured to introduce ozonated water, for example, generated by the generating device 6, to the tank section T1 along the inner wall surface W1a on one side in the circumferential direction, and various configurations can be applied.

[0048] In the case of the ozone water introduction unit 4 shown in Figure 1, it has a cylindrical (pipe-shaped) introduction pipe 41, which is inserted through the through hole 4a.

[0049] The tip (projection) 42 on the inner wall surface W1a side of the inlet pipe 41 is provided with a discharge port 40 on the side portion 43, which is on one side in the circumferential direction of the tip 42 (in the case of Figure 1, the side in the Z-winding direction with respect to the axis of the inner wall surface W1a), and the discharge port 40 is shaped to open on that side in the circumferential direction. In the case of the side portion 43 in Figure 1, it has a shape that extends on one side in the circumferential direction, and the discharge port 40 is provided at the end of the extension.

[0050] The number and shape of the discharge ports 40 can be set appropriately so as not to hinder the introduction of the target ozonated water (introducing it in a way that forms a swirling flow), and are not particularly limited. Examples of the opening shapes of the discharge ports 40 include circular, elliptical, and polygonal shapes.

[0051] <Example of the configuration of the ozone water outlet unit 5> The ozonated water outlet 5 only needs to be able to discharge the ozonated water stored in the tank section T1 to the outer periphery of the tank section T1 (for example, to recirculate it to the generating device 6, or to take it out for use as appropriate), and various configurations can be applied.

[0052] In the case of the ozone water outlet section 5 shown in Figure 1, it has a cylindrical pipe-shaped outlet tube 51, and this outlet tube 51 is connected to the through hole 5a in a communication manner.

[0053] In the outlet pipe 51, it may not only be connected to the through hole 5a by simply communicating with it, but may also be inserted as in Examples 4 to 7 described later, in which case an appropriate intake port 50, as described later, may be provided.

[0054] <Example of the configuration of the generating device 6> The ozonated water stored in the tank section T1 can be produced by appropriately applying various generating devices, such as those disclosed in Patent Documents 1 and 2. One example is the generating device 6 with the configuration shown in Figure 3.

[0055] The generating apparatus 6 in Figure 3 mainly comprises a circulation line 60 for circulating a solvent capable of dissolving ozone gas, a control unit 61 capable of controlling the circulation flow rate of the solvent in the circulation line 60, and a gas-liquid mixer 62 that supplies ozone gas at an arbitrary supply pressure while the solvent is circulating. A tank section T1 is provided connected to a part of the circulation line 60.

[0056] One configuration of the control unit 61 is to appropriately connect to the equipment (e.g., measuring instruments, regulators, controllers, on / off valves, circulation pumps, resistance thermometers, etc.) configured in the circulation line 60 and the gas-liquid mixer 62, as well as to the water level sensor 8 described later, via signal lines not shown. With this configuration, it is possible to operate each line as appropriate to acquire status information of the equipment and the water level sensor 8, and to output control commands to the equipment based on the acquired status information to control it.

[0057] In the gas-liquid mixer 62, for example, an ejector, aspirator, jet pump, etc., may be applied, but it is not limited to these, and various configurations can be applied. That is, the gas-liquid mixer 62 may have a solvent flow passage (not shown) through which the solvent flows, and an ozone gas introduction passage (not shown) connected to the solvent flow passage and provided to introduce the ozone gas supplied to the gas-liquid mixer 62 into the solvent flow passage.

[0058] Example 2 Figure 4 is a schematic diagram illustrating the main configuration of the storage tank T12 according to Embodiment 2. The tank section T1 of this storage tank T12 has the same configuration as the tank section T1 of the storage tank T11, with modifications to the shape of the inner wall surface W1a of the first peripheral wall W1.

[0059] Specifically, the first circumferential wall W1 of the storage tank T12 has an upper first circumferential wall portion 13 with a thickness equal to (or approximately equal to) that of the lower first circumferential wall portion 14. In addition, a constricted portion 15 with an annular shape is provided on the inner wall surface W1a at a position between the upper first circumferential wall portion 13 and the lower first circumferential wall portion 14 (between the bottom wall portion 11 and the top wall portion 12), projecting radially inward from that position and extending circumferentially along the inner wall surface 11a. The upper end face of this constricted portion 15 forms a stepped surface 10 similar to that of the storage tank T11.

[0060] With this type of storage tank T12, in addition to achieving the same effects as storage tank T11, the following can be said. Specifically, compared to storage tank T11, the lower first peripheral wall portion 14 is thinner, and the inner wall surface W1a of the lower first peripheral wall portion 14 is enlarged. This makes it easier to reduce the weight of the tank portion T1 and makes it easier to store more ozonated water.

[0061] Example 3 Figure 5 is a schematic diagram illustrating the main configuration of the storage tank T13 according to Embodiment 3. The tank section T1 of this storage tank T13 has the same configuration as the tank section T1 of the storage tank T11, with a modified shape of the stepped surface 10.

[0062] Specifically, the stepped surface 10 of the storage tank T13 has a tapered shape that is deflected upward from the radially outer side towards the inner side.

[0063] With this type of storage tank T13, in addition to achieving the same effects as storage tank T11, the following can be said. That is, compared to storage tank T11, in the introduction and discharge state of ozonated water, the ozonated water that flows from the ozonated water introduction section 4 and reaches the stepped surface 10 is encouraged to flow more upward than radially inward. Then, after passing the inner peripheral edge 10a of the stepped surface 10, a downward flow is formed with a more mitigated swirling flow.

[0064] Therefore, bubbles in ozonated water (for example, relatively fine bubbles) are more easily attracted to the axial side of the swirling flow and tend to aggregate, and these aggregated bubbles tend to float more easily, making gas-liquid separation easier. It also becomes easier to avoid bubbles being discharged from the ozonated water outlet 5. Furthermore, even in conditions where dispersed flow or turbulence is likely to occur in the swirling flow of ozonated water, such dispersed flow and turbulence become easier to suppress.

[0065] ≪Example 4≫ Figure 6 is a schematic diagram illustrating the main configuration of the storage tank T14 according to Embodiment 4. The tank section T1 of this storage tank T14 has the same configuration as the tank section T1 of storage tank T11, with a partition wall 16 provided on the inner circumference side of the stepped surface 10.

[0066] Specifically, the storage tank T13 is configured with a partition wall 16 that extends radially along the stepped surface 10 on the inner circumference side of the stepped surface 10. This partition wall 16 divides the inner wall surface W1a side of the first circumferential wall W1 into an upper side and a lower side. The partition wall 16 is provided with a through hole 16a that penetrates vertically. This through hole 16a may be simply one, or multiple through holes may be provided at dispersed positions as shown in Figure 6.

[0067] With this type of storage tank T14, in addition to achieving the same effects as storage tank T11, the following can be said. That is, compared to storage tank T11, in the introduction and discharge state of ozonated water, the ozonated water that flows from the ozonated water introduction section 4 and passes over the inner peripheral edge 10a of the stepped surface 10 flows downward only through the through hole 16a, so that a downward flow is formed with the momentum of the swirling flow further reduced.

[0068] Therefore, bubbles in ozonated water (for example, relatively fine bubbles) are more easily attracted to the axis of the swirling flow and tend to aggregate, and these aggregated bubbles tend to float further up and separate into gas and liquid. It also becomes easier to avoid bubbles being discharged from the ozonated water outlet 5. Furthermore, even in conditions where dispersed flow or turbulence is likely to occur in the swirling flow of ozonated water, such dispersed flow and turbulence become easier to suppress.

[0069] ≪Example 5≫ Figure 7 is a schematic diagram illustrating the main configuration of the storage tank T21 according to Embodiment 5. This storage tank T21 includes a tank section T2 which has a second circumferential wall W2 in addition to the first circumferential wall W1.

[0070] Specifically, the second circumferential wall W2 of the tank section T2 has a smaller diameter than the first circumferential wall W1 and has a cylindrical inner wall surface W2a. It is erected on the inner wall surface W1a side of the bottom wall section 11a on the inner wall surface W1a side of the first circumferential wall W1 (erected coaxially with the first circumferential wall W1). The dimension of the second circumferential wall W2 in the direction of erection is shorter than the dimension of the first circumferential wall W1 in the direction of erection. In addition, a second circumferential wall opening 20 is provided at the upper end of the second circumferential wall W2, which opens upward along the inner wall surface W2a.

[0071] In the case of the storage tank T21 shown in Figure 7, an ozonated water introduction section 4 is provided on the inner wall surface W2a side of the second circumferential wall W2 in the bottom wall 11, and the ozonated water can be introduced along the inner wall surface W2a on one side in the circumferential direction. Specifically, a through hole 4a is provided in the bottom wall 11, which penetrates the bottom wall 11 in the thickness direction, and an introduction pipe 41 having a discharge port 40 is inserted through this through hole 4a. In the case of the introduction pipe 41 in Figure 7, two discharge ports 40 are provided side by side in the direction of insertion of the introduction pipe 41 on the side portion 43 of the tip portion 42. On the other hand, in the case of Figure 8, which will be described later, the side portion 43 has a shape that extends to one side in the circumferential direction, and a discharge port 40 is provided at the end in the extension direction.

[0072] An ozone water outlet 5 is provided between the first circumferential wall W1 and the second circumferential wall W2 of the bottom wall 11, allowing ozone water located between the first circumferential wall W1 and the second circumferential wall W2 to be discharged to the outer circumference of the tank T2. Specifically, a through hole 5a is provided between the first circumferential wall W1 and the second circumferential wall W2 of the bottom wall 11, with the shape penetrating the bottom wall 11 in the thickness direction, and a discharge pipe 51 having an intake port 50 is inserted through this through hole 5a. In the case of the discharge pipe 51 shown in Figure 7, the tip (protruding part) 52 on the inner wall surface 11a side of the discharge pipe 51 has a shape in which the other side portion 53 in the circumferential direction extends to the other side in the circumferential direction, and an intake port 50 is provided at the end of the extension.

[0073] With the storage tank T21 described above, for example, as shown by arrow Y21 in Figure 8, by introducing ozonated water from the ozonated water introduction section 4 along the inner wall surface W2a to one side in the circumferential direction, the ozonated water flows along the inner wall surface 11a to one side in the circumferential direction, and a swirling flow of the ozonated water is formed.

[0074] When ozonated water is being introduced and released, the ozonated water from the ozonated water introduction section 4 to the vicinity of the second peripheral wall opening 20 flows upward (towards the second peripheral wall opening 20) while swirling along the inner wall surface 11a.

[0075] Then, the ozonated water that has passed the second peripheral wall opening 20 is encouraged to flow radially outward from the second peripheral wall opening 20, as shown by arrow Y22 in Figure 8. After flowing radially outward beyond the second peripheral wall opening 20, the momentum of the swirling flow is reduced, and a downward flow is formed that flows downward (towards the ozonated water outlet 5) between the first peripheral wall W1 and the second peripheral wall W2. Then, as shown by arrow Y23 in Figure 8, for example, it flows towards the ozonated water outlet 5.

[0076] In other words, the swirling flow of ozonated water introduced from the ozonated water introduction section 4 temporarily changes direction (changes radially outward) as it passes through the second peripheral wall opening 20, while the bubbles in the ozonated water are in a state where they are more likely to move upward along the inner wall surface 11a (i.e., in the direction before the change radially outward).

[0077] Therefore, bubbles in ozonated water (for example, relatively fine bubbles) tend to be attracted to the axis side of the swirling flow and aggregate, and these aggregated bubbles tend to float to the surface (for example, as relatively coarse bubbles) and separate into gas and liquid. In addition, it becomes easier to avoid bubbles being discharged from the ozonated water outlet 5. Furthermore, even if dispersed flow or turbulence is likely to occur in the swirling flow of ozonated water, such dispersed flow and turbulence are more easily suppressed.

[0078] The swirling flow formed along the inner wall surface 11a of the second peripheral wall W2 is an upward swirling flow. Therefore, the tendency for gas-liquid separation to be more pronounced may be more significant compared to, for example, that caused by the storage tank T21.

[0079] Example 6 Figure 9 is a schematic diagram illustrating the main configuration of the storage tank T22 according to Embodiment 6. The tank section T2 of this storage tank T22 has the same configuration as the tank section T2 of the storage tank T21, with a modified shape on the side of the second peripheral wall opening 20 on the inner wall surface W2a of the second peripheral wall W2.

[0080] Specifically, the side of the inner wall surface W2a facing the second peripheral wall opening 20 has a shape that widens in diameter as it approaches the second peripheral wall opening 20.

[0081] With a storage tank T22 like this, in addition to producing the same effects as storage tank T21, the following can be said: When an upward swirling flow within the inner wall surface 11a of the second peripheral wall W2 flows radially outward beyond the opening 20 of the second peripheral wall and becomes a downward flow, bubbles in the ozone water are less likely to be attracted to this downward flow. As a result, gas-liquid separation tends to be easier.

[0082] Example 7 Figure 10 is a schematic diagram illustrating the main configuration of the storage tank T23 according to Embodiment 7. The tank section T2 of this storage tank T23 has the same configuration as the tank section T2 of the storage tank T22, and in addition to the first circumferential wall W1 and the second circumferential wall W2, it has a third circumferential wall W3.

[0083] Specifically, the third circumferential wall W3 of the tank section T2 consists of a cylindrical body that extends vertically and is provided at a position opposite the second circumferential wall opening 20 on the upper side of the second circumferential wall W2. A third circumferential wall opening 30 is provided at the lower end of the third circumferential wall W3, which opens in a direction opposite to the second circumferential wall opening 20. The third circumferential wall W3 is configured to allow the gas inside to be discharged, for example, by providing an exhaust pipe (not shown) as described later.

[0084] The third peripheral wall W3 may be provided so as to penetrate the upper wall portion 12 vertically, as shown in Figure 10, for example, or it may be provided so as to be suspended from the inner wall surface 12a of the upper wall portion 12, as shown in Figures 11 and 12 described later.

[0085] With this type of storage tank T23, in addition to achieving the same effects as storage tank T22, the following can be said: When bubbles condensed by the upward swirling flow on the inner wall surface 11a side of the second circumferential wall W2 rise to the surface, it becomes easier to collect these rising bubbles within the third circumferential wall W3. That is, when the upward swirling flow on the inner wall surface 11a side of the second circumferential wall W2 flows radially outward beyond the opening 20 of the second circumferential wall and becomes a downward flow, the number of bubbles attracted to the downward flow can be reduced. This tends to make gas-liquid separation even easier.

[0086] The shape of the cylindrical body of the third peripheral wall W3, the shape of the opening 30 in the third peripheral wall (such as the opening diameter), and its vertical position (such as the distance between it and the opening 20 in the second peripheral wall) can be set as appropriate, provided that they do not hinder the swirling flow or gas-liquid separation formed on the inner wall surface W1a side of the second peripheral wall W2.

[0087] One example is to set the vertical position of the third peripheral wall opening 30 (hereinafter simply referred to as the position of the third peripheral wall opening 30) to be the same as the vertical position of the second peripheral wall opening 20 (hereinafter simply referred to as the position of the second peripheral wall opening 20) as shown in Figure 11, or to be on the upper side as shown in Figure 12.

[0088] In the case of Figure 11, since the opening diameter t3 of the third circumferential wall opening 30 is smaller than the opening diameter t2 of the second circumferential wall opening 20, it is possible to set the position of the third circumferential wall opening 30 lower than the position of the second circumferential wall opening 20. However, this is undesirable because it may hinder the swirling flow and gas-liquid separation described above.

[0089] In the case of Figure 12, since the position of the third peripheral wall opening 30 is above the position of the second peripheral wall opening 20, it is possible to set the opening diameter t3 of the third peripheral wall opening 30 to be larger than the opening diameter t2 of the second peripheral wall opening 20. However, from the viewpoint of preventing the bubbles collected in the third peripheral wall W3 from moving towards the area between the first peripheral wall W1 and the second peripheral wall W2, it is preferable to set the opening diameter t3 to be smaller than the opening diameter t2.

[0090] Furthermore, as shown in Figures 11 and 12, it is preferable to appropriately control the water level L of the ozonated water in the tank section T2 so that it is located above the third peripheral wall opening 30. One method for controlling the water level L in this way is to appropriately control the amount of ozonated water introduced from the ozonated water introduction section 4 while appropriately detecting the water level L using the measuring tube 7, described later, which is provided on the outer wall surface W1b side of the first peripheral wall W1, as shown in Figures 11 and 12.

[0091] The measuring tube 7 only needs to be able to detect fluctuations in the water level L using the first water level sensor 81, the second water level sensor 82, and the third water level sensor 83 (hereinafter, these will be collectively referred to as the water level sensor 8 as appropriate), and various configurations can be applied.

[0092] The measuring tube 7 shown in Figures 11 and 12 has a cylindrical pipe shape and is configured to include a vertical pipe section 70 that extends in the vertical direction, an upper connecting section 71 that extends from the upper end of the vertical pipe section 70 in a curved manner toward the first circumferential wall W1 and is connected to the through hole 17a (connected to the upper first circumferential wall section 13), and a lower connecting section 72 that extends from the lower end of the vertical pipe section 70 in a curved manner toward the first circumferential wall W1 and is connected to the through hole 17b (connected to the lower first circumferential wall section 14).

[0093] Furthermore, a first water level sensor 81 is provided on the outer circumference of the riser section 70 at a position horizontal to the third peripheral wall opening 30. A second water level sensor 82 is provided on the outer circumference of the riser section 70 between the first water level sensor 81 and the upper communication section 71, at a position above the third peripheral wall opening 30. A third water level sensor 83 is provided on the outer circumference of the riser section 70 between the first water level sensor 81 and the lower communication section 72, at a position above, for example, the inlet pipe 41 or outlet pipe 51. The water level sensors 8 can be non-contact type water level sensors that can detect the water level L inside the measuring pipe 7 at their respective installation positions on the outer circumference of the measuring pipe 7 (detection without contact with the ozonated water), and optical water level sensors are one example.

[0094] With the measuring tube 7 described above, when the water level L in the tank section T2 is located above the through-hole 17b, ozonated water flows into the measuring tube 7. Also, when the water level L in the tank section T2 fluctuates between the through-hole 17a and the through-hole 17b, the water level L of the ozonated water in the measuring tube 7 will also fluctuate.

[0095] For example, if the water level L fluctuates near the third peripheral wall opening 30, this can be detected by the first water level sensor 81, which is positioned horizontally to the third peripheral wall opening 30. This allows for the detection of fluctuations in the water level L near the third peripheral wall opening 30 by the first water level sensor 81, and the appropriate adjustment of the amount (flow rate) of ozonated water introduced into the tank T2, thereby controlling the water level L to be located near or above the third peripheral wall opening 30 (i.e., positioned so that the third peripheral wall opening 30 is submerged in the ozonated water) (for example, controlled via the control unit 61 of the generating device 6).

[0096] By controlling the water level L in this way, it becomes easier to capture the floating bubbles in the ozone water within the third surrounding wall W3.

[0097] If the water level L is located above the detection range of the first water level sensor 81, it is preferable to control the water level L appropriately to prevent it from rising too high. For example, if the second water level sensor 82, located above the first water level sensor 81, detects the water level L, the amount of ozone water introduced (flow rate) from the ozone water introduction unit 4 can be limited, or the operation of the generator 6 can be stopped (for example, a high water level alarm can be issued to the administrator, and the system can be completely stopped to maintain safety). This makes it possible to prevent, for example, the amount of ozone water in the tank T2 from exceeding the allowable capacity of the tank T2.

[0098] On the other hand, if the water level L is located below the detection range of the first water level sensor 81, it is preferable to control the water level L appropriately to prevent it from dropping too low. For example, when the third water level sensor 83, located below the first water level sensor 81, detects the water level L, it is possible to increase the amount of ozone water introduced from the ozone water introduction unit 4, limit the amount of ozone water discharged from the ozone water discharge unit 5, or stop the operation of the generator 6 (for example, by issuing a low water level alarm to the administrator and completely stopping the system to maintain safety). This makes it possible to avoid, for example, the tank T2 becoming empty and to avoid any impact on the generator 6 (for example, the impact of air inflow).

[0099] It is preferable that the through-holes 17a and 17b in the measuring tube 7, which are in communication with the first peripheral wall W1, are located away from the intake port 50 (or away from the discharge port 40 and intake port 50 when applied to the tank section T1 as described later). This makes it easier to suppress the inflow of air bubbles into the measuring tube 7 through the through-holes 17b, even if, for example, air bubbles tend to condense near the intake port 50.

[0100] The measuring tube 7 can be manufactured by various methods. For example, when manufactured by bending a single cylindrical pipe, it is possible to obtain a structure in which the vertical section 70, the upper connecting section 71, and the lower connecting section 72 are integrally molded. With a measuring tube 7 in this integrally molded structure, it is possible to create a continuous smooth surface on the inner wall surface of the curved section 73 between the vertical section 70 and the upper connecting section 71, and on the inner wall surface of the curved section 74 between the lower connecting section 72 and the vertical section 70. By making the inner wall surfaces of the curved sections 73 and 74 continuous smooth surfaces, it becomes easier to prevent bubbles from accumulating on the inner wall surfaces (especially the upper side of the inner wall surface) if, for example, air bubbles flow into the measuring tube 7.

[0101] In the curved sections 73 and 74, the respective radii of curvature can be set as appropriate and are not particularly limited. For example, the larger the radius of curvature, the easier it is to prevent air bubbles from accumulating on the inner wall surface of the curved sections 73 and 74, as mentioned above, and the easier it is to perform bending processes. On the other hand, the smaller the radius of curvature, the easier it is to secure the length of the vertical pipe section 70 in the vertical direction, and the wider the installation range for the water level sensor 8. For example, the second water level sensor 82 can be placed higher up (for example, it becomes easier to suppress the issuance of high water level alarms to the administrator and prevent situations that result in a complete shutdown), and the third water level sensor 83 can be placed lower down (for example, it becomes easier to suppress the issuance of low water level alarms to the administrator and prevent situations that result in a complete shutdown).

[0102] Therefore, the radius of curvature of each of the curved sections 73 and 74 should be set appropriately according to the intended use of the tank section T2 (appropriately set considering the balance of safety, operational continuity, etc.). For example, the radius of curvature of each of the curved sections 73 and 74 should be set appropriately to R10 mm or more or R20 mm or more.

[0103] The upper and lower connecting portions 71 and 72 shown in Figures 9 and 10 are depicted simply as extending horizontally, but are not limited to this and can be configured in various ways. The upper and lower connecting portions 71 and 72 do not have to be the same shape (for example, approximately the same diameter), and may be different shapes (for example, different diameters).

[0104] In the upper connecting portion 71, the upper side of its inner wall surface is made inclined so that it is biased upward from the vertical pipe portion 70 side towards the through hole 17a side. Specifically, the through hole 17a is made inclined so that it is biased upward from the outside to the inside in the thickness direction of the first peripheral wall W1, and the through hole 17a is appropriately shaped so that the upper connecting portion 71 can be inserted through it.

[0105] In the lower connecting section 72, the upper side of its inner wall surface is made inclined so that it is biased upward from the through-hole 17b side towards the vertical pipe section 70 side. Specifically, the through-hole 17b is made inclined so that it is biased upward from the inside to the outside in the thickness direction of the first peripheral wall W1, and the through-hole 17b is appropriately shaped so that the lower connecting section 72 can be inserted through it.

[0106] If the upper side of the inner wall surface of the upper connecting section 71 and the lower connecting section 72 is inclined in this way, it becomes easier to prevent air bubbles from accumulating on the upper side of the inner wall surface.

[0107] Furthermore, if, for example, the upper connecting portion 71 and the lower connecting portion 72 each have a cylindrical pipe shape, the larger the inclination angle of the first peripheral wall W1 with respect to the wall thickness direction, the more likely it is that the through-hole will have the inclined through-shape described above, and the major axis dimension of the ellipse will increase. In this case, the machinability of the through-holes 17a and 17b, and the ease of mounting the upper connecting portion 71 and the lower connecting portion 72, respectively, may be reduced.

[0108] Therefore, when the through holes 17a and 17b are made in an inclined through shape, they should be set appropriately according to the intended use of the tank section T2 (appropriately set considering the balance between the conditions under which air bubbles may form in the tank section T2 and processing costs).

[0109] The measuring tube 7 described above may be installed on the outer wall surface W1b of the first peripheral wall W1 in the tank section T1, and, as in the case where it is installed in the tank section T2, the amount of ozone water introduced from the ozone water introduction section 4 can be appropriately controlled while appropriately detecting the water level L in the tank section T1.

[0110] When the measuring tube 7 is applied to the tank section T1 in this manner, the first water level sensor 81 is provided on the outer circumference of the vertical pipe section 70 at a position that is horizontal to the ozone water introduction section 4 (for example, the discharge port 40 of the introduction pipe 41).

[0111] By applying the measuring tube 7 to the tank section T1 in this way, for example, when the water level L fluctuates near the ozone water introduction section 4, it is possible to detect this fluctuation using the first water level sensor 81, which is positioned horizontally to the ozone water introduction section 4. This makes it possible to control the water level L so that it is located near or above the ozone water introduction section 4 (for example, so that the outlet 40 of the introduction tube 41 is submerged in the ozone water) by appropriately adjusting the amount (flow rate) of ozone water introduced into the tank section T1 while detecting the fluctuation of the water level L near the ozone water introduction section 4 using the first water level sensor 81. By controlling the water level L in this way, it is possible to avoid the ozone water introduced from the ozone water introduction section 4 hitting the water surface of the tank section T1, and to suppress the formation of bubbles.

[0112] <Notes for Examples 1-7> In addition to supplying and storing ozonated water from the generator 6 in tank sections T1 and T2, back pressure adjustment gases (for example, one or more of inert gases such as N2, Ar, He, carbon dioxide, or low-concentration ozone gas) may also be supplied to adjust the back pressure within each tank section T1 and T2.

[0113] In this case, the pressure regulating gas piping (not shown) for supplying back pressure regulating gas to the tank sections T1 and T2 may be connected not simply to the upper wall section 12, but to a position above the second water level sensor 82 on the upper first peripheral wall section 13. This allows the water surface to be moderately disturbed when the back pressure regulating gas is flowed along the water surface of the respective tank sections T1 and T2, which can make it easier to suppress the formation of bubbles below the water surface.

[0114] Furthermore, exhaust pipes (not shown) may be provided in tank sections T1 and T2, respectively, to exhaust the gas (for example, the gas phase separated from the solvent) from the tank sections T1 and T2 while maintaining a constant pressure within the tank sections T1 and T2.

[0115] In this exhaust pipe, similar to the pressure regulating gas piping, it is possible to connect it to a position above the second water level sensor 82 within the upper first peripheral wall 13, rather than simply connecting it to the upper wall 12. In the case of the storage tank T23, it is possible to provide the exhaust pipe on at least one of the upper first peripheral wall 13 and the third peripheral wall W3.

[0116] Storage tanks T11-T14 and T21-T23 can be constructed using various materials, for example, by applying materials with ozone resistance. Specific examples include using perfluoroalkoxyalkanes, polytetrafluoroethylene, etc. In the case of the measuring tube 7, at least at the point facing the water level sensor 8, it is preferable to use perfluoroalkoxyalkanes to ensure the desired transparency (for example, transparency sufficient for the water level sensor 8 to detect the water level).

[0117] Although the present invention has been described in detail only with respect to the specific examples described above, it will be obvious to those skilled in the art that a wide variety of modifications are possible within the scope of the technical concept of the present invention, and it is natural that such modifications fall within the scope of the claims.

[0118] For example, the embodiments in Examples 1 to 7 may be combined as appropriate, and the designs can also be modified by applying the contents disclosed in Patent Documents 1 and 2 as appropriate, and the same effects as those in Examples 1 to 7 can be achieved. Furthermore, the technical ideas other than those stated in the claims that can be grasped from the aforementioned embodiments 1 to 7 are described in [1] to [9] below.

[0119] [1] A first circumferential wall having a cylindrical inner wall surface, and a second circumferential wall having a smaller diameter than the first circumferential wall and a cylindrical inner wall surface, which is coaxially arranged on the inner wall side of the first circumferential wall, are erected on the bottom wall, and a tank section capable of storing ozonated water is provided on the inner wall side of the first circumferential wall and the inner wall side of the second circumferential wall, An ozone water introduction unit is provided on the inner wall surface side of the second peripheral wall in the bottom wall portion, and introduces the ozone water along the inner wall surface of the second peripheral wall to one side in the circumferential direction of the inner wall surface, An ozone water outlet is provided between the first and second peripheral walls of the bottom wall portion, and the ozone water located between the first and second peripheral walls is directed out to the outer periphery of the tank portion. Equipped with, The aforementioned second perimeter wall is The dimension in the vertical direction is shorter than that of the first peripheral wall. An ozone water storage tank characterized in that a second peripheral wall opening is provided at the upper end of the second peripheral wall, the opening being shaped to open upward along the inner wall surface of the second peripheral wall.

[0120] [2] The ozone water storage tank according to [1], characterized in that the inner wall surface of the second peripheral wall on the side of the second peripheral wall opening is shaped to widen as it approaches the second peripheral wall opening.

[0121] [3] A cylindrical third circumferential wall extending in the vertical direction is provided at a position above the second circumferential wall and opposite to the opening of the second circumferential wall, The ozone water storage tank according to [1], characterized in that the third peripheral wall is provided with a third peripheral wall opening that is shaped to open in a direction opposite to the second peripheral wall opening.

[0122] [4] The ozone water storage tank according to [1], characterized in that the position in the vertical direction at the third peripheral wall opening is above the position in the vertical direction at the second peripheral wall opening, or the position in the vertical direction at the second peripheral wall opening.

[0123] [5] The ozone water introduction section has a protruding portion that extends from the inner wall surface of the bottom wall, The ozone water storage tank according to [1], characterized in that a discharge port having an opening on one side in the circumferential direction is provided on one side of the protruding portion.

[0124] [6] The ozonated water storage tank according to [1], characterized in that a pipe is provided in the upper first peripheral wall for introducing one or more of the following into the tank: an inert gas, carbon dioxide, or low-concentration ozone gas.

[0125] [7] The ozone water storage tank according to [1], characterized in that an exhaust pipe is provided in the upper first peripheral wall portion for exhausting the gas inside the tank portion to the outer periphery of the tank portion.

[0126] [8] The ozone water generating apparatus according to [3], further characterized in that an exhaust pipe is provided in at least one of the upper first peripheral wall and the third peripheral wall for exhausting the gas in the tank to the outer wall surface of the peripheral wall.

[0127] [9] A circulation line for circulating a solvent capable of dissolving ozone gas, A control unit that controls the circulation flow rate of the solvent, A gas-liquid mixer in which the solvent flows and the ozone gas is supplied at an arbitrary supply pressure, in a circulating state in which the solvent is circulating. An ozone water storage tank as described in any of the above [1] to [8], An ozone water generating device characterized by being equipped with the following features. [Explanation of Symbols]

[0128] T11-T14, T21-T23... Storage tanks T1, T2... Tank section W1…1st peripheral wall W2...Second perimeter wall W3…3rd peripheral wall W1a, W2a... Interior wall surfaces 10…Step surface 15... the constricted part 16… Partition wall 20…Second peripheral wall opening 30...Third peripheral wall opening 4…Ozone water introduction section 5...Ozone water outlet 6…Generation device 7... Measuring tube 81, 82, 83… Water level sensors

Claims

1. A first peripheral wall having a cylindrical inner wall surface is erected on the bottom wall, and a tank section capable of storing ozonated water is provided on the inner wall surface side of the first peripheral wall, A stepped surface having a shape that protrudes radially inward from a position between the upper end and the bottom wall portion on the inner wall surface of the first peripheral wall, extends circumferentially on the inner wall surface and faces upward, An ozone water introduction unit is provided on the upper first circumferential wall portion of the first circumferential wall, which is above the stepped surface of the first circumferential wall portion, and introduces the ozone water to one side in the circumferential direction along the inner wall surface of the upper first circumferential wall portion, An ozone water outlet is provided in the bottom wall portion and discharges the stored ozone water to the outer periphery of the tank portion, Equipped with, A partition wall is provided on the inner circumference of the stepped surface, with a shape that extends radially along the stepped surface. The ozonated water storage tank is characterized in that the partition wall has one or more through holes that penetrate in the vertical direction.

2. The ozonated water storage tank according to claim 1, characterized in that the stepped surface has a tapered shape that is biased upward from the outer side in the radial direction to the inner side.

3. The first peripheral wall comprises a measuring tube having a shape that extends in the vertical direction on the outer wall surface side, The aforementioned measuring tube is The upper end of the measuring tube is connected to the upper first peripheral wall and communicates with the inner wall surface of the upper first peripheral wall. The lower end of the measuring tube is connected to the lower first peripheral wall portion of the first peripheral wall, which is below the stepped surface, and communicates with the inner wall surface of the lower first peripheral wall portion. The ozone water storage tank according to claim 1, characterized in that a first water level sensor capable of detecting the ozone water present on the inner circumference of the measuring tube is provided at a position on the outer circumference of the measuring tube that is horizontal with respect to the ozone water introduction section.

4. The ozone water storage tank according to claim 1, characterized in that the ozone water introduction section has a protruding portion that extends from the inner wall surface of the upper first circumferential wall, and a discharge port that opens to one side in the circumferential direction is provided on one side of the protruding portion in the circumferential direction.

5. The ozone water storage tank according to claim 1, characterized in that the upper first peripheral wall is provided with piping for introducing one or more of the following into the tank: inert gas, carbon dioxide, and low-concentration ozone gas.

6. The ozone water storage tank according to claim 1, characterized in that an exhaust pipe for exhausting the gas inside the tank to the outer periphery of the tank is provided in the upper first peripheral wall.

7. A circulation line that circulates a solvent capable of dissolving ozone gas, A control unit that controls the circulation flow rate of the solvent, A gas-liquid mixer in which the solvent flows and the ozone gas is supplied at an arbitrary supply pressure, in a circulating state in which the solvent is circulating. An ozone water storage tank according to any one of claims 1 to 6, An ozone water generating device characterized by being equipped with the following features.

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