Static mixing apparatus for producing long-term sustainable ozone water

Abstract

To provide a static mixing apparatus for producing long-term sustainable ozone water that can be easily downsized and can sustain an ozone density for a long term even when inflow pressure of liquid is low.SOLUTION: A static mixing apparatus (40) produces long-term sustainable ozone water having ozone gas sustained for a long term, from liquid mixed with ozone including ozone gas. The static mixing apparatus comprises a static swirl flow generating part (41), arranged in a first tube (TU), which makes the liquid mixed with ozone conveyed from the first tube generate swirl flow, and a cavitation generating part (44), arranged in the first tube, which makes the liquid mixed with ozone swirled in the swirl flow generating part generate cavitation. The cavitation generating part (44) includes a shaft part, a first unit (441) in which a predetermined number of fins are arranged at a first angle around the shaft with respect to a direction of the first tube, and a second unit (442) in which a predetermined number of fins are arranged at the first angle around the shaft part.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a static mixer for producing a long-lasting ozone liquid that can maintain an ozone concentration for a long period of time, such as several days. [Background technology]

[0002] Ozone gas has been used for environmental sterilization and purification because of its rapid and extremely high sterilization ability, its extremely wide sterilization spectrum, and the fact that it does not produce resistant bacteria. However, because ozone gas is a gas, it cannot be used in open environments, and there are problems with it being taken into the alveoli of the human lungs through breathing, which can have serious effects on the human body. On the other hand, ozone liquid, made by bubbling ozone in a solution, can be sprayed by spraying, etc., and therefore does not have these drawbacks.

[0003] Patent Document 1 proposes an ozone water generator that supplies a pressurized liquid phase to a bubble generating nozzle to precipitate dissolved oxygen gas contained in the liquid phase and generate oxygen cavitation bubbles, and then irradiates the liquid phase with ultraviolet light having a wavelength of 185 nm to generate ozone microbubbles from the oxygen cavitation bubbles. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2019-55402 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, the ozone water generated by the ozone water generating device described in Patent Document 1 has an extremely weak ozone retention capacity, and disappears in about 30 minutes even when left standing in a clean container. [Means for solving the problem]

[0006] Therefore, the present invention provides a static mixer for producing long-lasting ozone liquid, which can be easily miniaturized and can maintain ozone concentration for a long period of time even when the liquid inflow pressure is low.

[0007] The static mixer for producing long-lasting ozone liquid of this embodiment produces long-lasting ozone liquid that maintains ozone gas for a long period of time from an ozone mixture containing ozone gas. The static mixer includes a static swirl flow generator disposed within the first tube that generates a swirling flow in the ozone mixture transported from a first tube, and a static cavitation generator disposed within the first tube that generates cavitation in the ozone mixture swirled by the swirl flow generator. The cavitation generator includes a shaft, a first unit having a predetermined number of fins arranged around the shaft at a first angle relative to the direction of the first tube, and a second unit having a predetermined number of fins arranged around the shaft at the first angle. The first and second units are disposed at a second angle different from the first angle. The swirl flow generating part may be cylindrical with an outer diameter equal to the inner diameter of the first tube and a threaded outer periphery. Preferably, the cavitation generating part has a shaft portion with a cross-sectional area that is 3 / 5 to 1 / 4 of the inner diameter area of ​​the second tube.

[0008] The static mixer for producing long-lasting ozone liquid of this embodiment produces long-lasting ozone liquid that maintains ozone gas for a long period of time from an ozone mixture containing ozone gas. The static mixer includes a swirling flow generator having a swirling plate disposed within a second tube whose center is different from the axis of the first tube and that generates a swirling flow in the ozone mixture transported from the first tube, and a static cavitation generator disposed within the second tube that generates cavitation in the ozone mixture swirled by the swirling flow generator. The cavitation generator includes a shaft, a first unit having a predetermined number of fins arranged around the shaft at a first angle relative to the direction of the first tube, and a second unit having a predetermined number of fins arranged around the shaft at the first angle. The first unit and the second unit are disposed at a second angle different from the first angle. The rotating plate preferably has a plurality of axially extending elongated holes formed therein, penetrating from the outer periphery to the inner periphery of the cylindrical body.The cavitation generating portion preferably has a cross-sectional area of ​​the shaft portion that is 3 / 5 to 1 / 4 of the inner diameter area of ​​the second tube.

[0009] It is preferable that the first unit and the second unit each have a first stage fin section having a predetermined number of fins and a second stage fin section having a predetermined number of fins arranged downstream of the first stage fin section, and that the first stage fin section and the second stage fin section are arranged at a third angle different from the first angle. The cross-sectional shape of the fin is preferably one of rectangular, trapezoidal, triangular, and teardrop shapes. The cross-sectional shape of the fin is preferably either an arch shape or a flying wing shape, in which the surface facing upward is asymmetrical with respect to the direction in which the ozone-mixed liquid flows. [Effects of the Invention]

[0010] The static mixer for producing a long-lasting ozone solution according to one embodiment of the present invention can be easily miniaturized and can maintain the ozone concentration of the ozone solution for a long period of time. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a functional block diagram of an ozone liquid generation device according to an embodiment of the present invention. FIG. [Figure 2] The figures show examples of static mixers 40 for producing long-lasting ozone liquid, where (A) is a first example 40A, (B) is a second example 40B, and (C) is a third example 40C. The dotted circle also shows an enlarged side view of the fin. [Figure 3] These are diagrams showing examples of static mixers 40 for producing long-lasting ozone liquid, with (A) being a fourth example 40D, (B) being a fifth example 40E, and (C) being a sixth example 40F. The dotted circle shows an enlarged side view of the fin. Also shown in (A) are a side view and an enlarged view of the cavitation generating section disposed in the tube TU. [Figure 4] 1A and 1B are diagrams showing an embodiment of a static mixer 40 for producing a long-lasting ozone liquid, where (A) is a seventh example 40G and (B) is an eighth example 40H. [Figure 5] 1A and 1B are diagrams showing examples of static mixers 40 for producing long-lasting ozone liquid, where (A) is a ninth example 40I and (B) is a tenth example 40J. [Figure 6] 1 shows an embodiment of a static mixer 40 for producing long-lasting ozone liquid, where (A) is an eleventh example 40K and (B) is a twelfth example 40L. (A) and (B) each show a cross-sectional view of the AA cross section of the swirling flow generating section, and an enlarged cross-sectional view is shown within the dotted circle in (A). DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In this specification and the drawings, components having substantially the same functional configurations are designated by the same reference numerals, and redundant explanations will be omitted. In addition, the drawings are not drawn to actual size in order to emphasize the components.

[0013] <<Outline of ozone liquid generator>> Fig. 1 is a functional block diagram of an ozone liquid generation apparatus 100 of this embodiment. This ozone liquid generation apparatus 100 is configured to include a liquid transfer section 10, an ozone gas transfer section 20, a gas-liquid mixing section 30, a static mixer 40, a gas-liquid separation section 50, and a waste gas treatment section 60 inside a case. The static mixer 40 of this embodiment does not have to be applied to the configuration of the ozone liquid generation apparatus 100 shown in Fig. 1; for example, the ozone liquid generation apparatus 100 does not have to include the gas-liquid separation section 50, etc. In other words, the static mixer 40 of this embodiment may be disposed after ozone gas has been mixed into liquid (after the gas-liquid mixing section 30) in any ozone liquid generation apparatus.

[0014] The liquid transport unit 10 transports the liquid that is the raw material for the ozone liquid, and includes, for example, a container for the liquid and a pump. Examples of the liquid include purified water, distilled water, and a liquid containing 0.9% sodium chloride, but the type of liquid is not limited to these. For example, Ringer's solution or oxyglutathione solution can also be used.

[0015] The liquid flowing out of the container is supplied to the pump 12, which continuously pumps out a constant amount of liquid. The transport flow rate can be adjusted by changing the rotation speed of the pump, and the liquid is continuously transported to the gas-liquid mixing section 30.

[0016] The ozone gas transport unit 20 generates ozone gas by electrical discharge using oxygen as a raw material gas, adjusts the flow rate of the ozone gas with an electromagnetic valve, and continuously transports the ozone gas to the gas-liquid mixer 30 .

[0017] The gas-liquid mixer 30 mixes the liquid transported from the liquid transporter 10 with the ozone gas transported from the ozone gas transporter 20 to generate an ozone-mixed liquid. Generally, a motor rotates blades inside a container to cause agitation, and the gas-liquid mixer 30 generates an ozone-mixed liquid with a constant ozone concentration due to the cavitation effect that occurs during agitation. In the generated ozone-mixed liquid, ozone gas is dispersed in the solution as bubbles of 50 μm to several μm (median bubble diameter). The gas-liquid mixer 30 of the ozone liquid generator 100 generates an ozone-mixed liquid at a rate of, for example, 3 liters / minute to 6 liters / minute.

[0018] However, bubbles with diameters of 50 μm to several μm rise toward the liquid surface over time and burst. As a result, the ozone concentration in the generated ozone-mixed liquid gradually decreases, reaching nearly 0 ppm in about 30 minutes. For this reason, the ozone-mixed liquid generated in the gas-liquid mixing section 30 is continuously transported to the static mixer 40.

[0019] In the static mixer 40, the ozone gas bubbles contained in the ozone mixture can be made smaller, thereby stabilizing the solution for a long period of time. Specifically, by having the ozone gas exist in the ozone mixture as microbubbles with a diameter of 200 nm or less, the ozone gas can be preserved in the solution for a long period of time. When the ozone gas becomes microbubbles with a diameter of 200 nm or less, the microbubbles rise at a slow rate, and due to their excellent dissolving ability, the diameter of the ozone gas bubbles gradually decreases and eventually disappears. Therefore, the ozone gas microbubbles remain in the solution for a long period of time. The generated long-lasting ozone solution is supplied to the gas-liquid separator 50. The specific structure of the static mixer 40 will be described later.

[0020] The gas-liquid separation section 50 separates the long-lasting ozone liquid produced in the static mixer 40 into a mixed gas of oxygen that does not dissolve in the liquid and residual ozone (hereinafter referred to as "waste gas"), and an ozone liquid in which ozone gas is dissolved in the liquid.

[0021] The waste gas treatment unit 60 decomposes residual ozone gas contained in the waste gas separated by the gas-liquid separation unit 50 into oxygen and exhausts the oxygen. The above is the configuration of each unit in the ozone liquid production device 100.

[0022] <<Static Mixer Overview>> The static mixer 40 of this embodiment includes a swirl flow generating section and a cavitation generating section. Specifically, it has the configurations of the first to twelfth examples shown in Figures 2 to 6. The static mixer 40 is disposed midway along the tube TU leading from the gas-liquid mixing section 30 to the gas-liquid separation section 50.

[0023] Example 1 The static mixer 40A of the first example shown in FIG. 2(A) includes a screw-type swirl flow generating section 41 and a cavitation generating section 44A with rectangular fins 49A having a rectangular cross-sectional shape. The static mixer 40A may further include a circular tube TU. The screw-type swirl flow generating section 41 is cylindrical with an outer diameter approximately equal to the inner diameter of the circular tube TU, and a screw groove is formed on the outer periphery of the cylindrical outer diameter. The inner diameter of the tube TU is, for example, 3 mm to 10 mm. The length L1 of the tube TU is 40 to 60 mm. The ozone-mixed liquid containing bubbles of 50 μm to several μm has its flow area narrowed by the screw-type swirl flow generating section 41, thereby increasing its flow rate. The ozone-mixed liquid is rotated by the screw groove of the screw-type swirl flow generating section 41, which has a lead angle of 20 to 40 degrees, preferably 30 degrees, and reaches the cavitation generating section 44A. The ozone mixed liquid may be rotated one to two times in the screw type swirl flow generating part 41. Note that the screw type swirl flow generating parts 41 of second to sixth examples described below have the same structure.

[0024] In the first example of the cavitation generation section 44A shown in FIG. 2(A), four fin units (441-444) are attached around a support 45. The distance L3 between one fin unit and the adjacent fin unit is, for example, 1 mm to 2 mm. Each of the four fin units (441-444) is attached with two fin stages: a first fin stage 44p and a second fin stage 44q. A plurality of rectangular fins 49A are attached to the fin stages (44p, 44q) on the support 45 or a fin mounting member (a cylindrical column attached to the support). The distance L4 between the first fin stage 44p and the second fin stage 44q is also, for example, 1 mm to 2 mm.

[0025] The rectangular fins 49A, each with a rectangular cross section (see the enlarged cross section in the dotted circle), are attached at an angle θ1 relative to the axial direction of the support 45. For example, the angle θ1 is 12-18 degrees. A more preferable angle is 14-16 degrees. A θ1 angle of 18 degrees or greater creates resistance to the flow of the ozone-mixed liquid in the tube TU, reducing the flow rate and making it difficult for cavitation to occur downstream. A θ1 angle of 12 degrees or less increases the flow rate of the ozone-mixed liquid, but makes it difficult for cavitation to occur in the fins 49. The cross-sectional area of ​​the rectangular fins 49A is, for example, 2-4 mm long and 0.3-0.7 mm thick. The relationship between the inner diameter area of ​​the tube TU and the cross-sectional area of ​​the support 45 is described in FIG. 3(A).

[0026] Each fin stage (44p, 44q) has fins 49A attached at equal intervals in the circumferential direction to facilitate mass production. For example, six fins 49A are attached to the fin stage at 60-degree intervals in the circumferential direction. The second fin stage 44q of the fin stage is attached at an angle θ2 relative to the first fin stage 44p of the fin stage. For example, the θ2 angle is 21-227 degrees, preferably 23-25 ​​degrees. Since the ozone-mixed liquid creates a flow along the fins 49, by setting the θ2 angle between the first fin stage 44p and the second fin stage 44q, the ozone-mixed liquid flowing out from the first fin stage 44p efficiently enters the second fin stage 44q, ensuring the generation of cavitation and the flow rate of the ozone-mixed liquid.

[0027] While FIG. 2(A) shows four fin units (441-444), the number may be two or more, and may be five or more depending on the length of the tube TU. Adjacent fin units may be mounted with a space of several millimeters between them in the axial direction, or may be mounted without any gaps in the axial direction. In FIG. 2(A), adjacent fin units are mounted with a space of several millimeters between them in the axial direction. Fin unit 441 and fin unit 442 are mounted rotated by an angle θ3. Fin unit 442 agitates microbubbles (with a diameter of 200 nm or less) generated when cavitation generated in fin unit 441 bursts. The angle θ3 is, for example, 6 to 12 degrees, preferably 8 to 12 degrees, and may vary for each unit. Similarly, fin unit 442 and fin unit 443, and fin unit 443 and fin unit 444 are mounted rotated by an angle θ3. The cavitation generating unit 44A converts an ozone mixed liquid containing bubbles of 50 μm to several μm into a long-lasting ozone liquid containing microbubbles with a diameter of 200 nm or less.

[0028] Example 2 2(B) shows a second example of a static mixer 40B, which includes a screw-type swirling flow generating section 41 and a cavitation generating section 44B having trapezoidal fins 49B with a trapezoidal cross-sectional shape. The flow velocity of the ozone-mixed liquid increases in the screw-type swirling flow generating section 41, and the liquid is rotated and reaches the cavitation generating section 44B.

[0029] 2(B), a cavitation generation section 44B of the second example has four fin units (441-444) attached around a support column 45. Each fin unit consists of two fin stages: a first fin stage 44p and a second fin stage 44q. Trapezoidal fin 49B, which has a trapezoidal cross section (see in particular the enlarged cross section in the dotted circle), is attached at an angle of θ1 with respect to the axial direction of the support column 45.

[0030] The second fin stage 44q is attached at an angle θ2 relative to the first fin stage 44p. The trapezoidal fins 49B of the first fin stage 44p have their upper bases located on the upstream side, while the trapezoidal fins 49B of the second fin stage 44q have their upper bases located on the downstream side. This is to make it easier to generate cavitation. As with the first example, in the second example, adjacent fin units (441-444) are attached at an angle θ3. The cavitation generating unit 44B converts the ozone mixed liquid into a long-lasting ozone liquid containing microbubbles with a bubble diameter of 200 nm or less.

[0031] Example 3 2(C) shows a third example of a static mixer 40C, which includes a screw-type swirling flow generating section 41 and a cavitation generating section 44C having triangular fins 49C with a triangular cross-sectional shape. The flow velocity of the ozone-mixed liquid increases in the screw-type swirling flow generating section 41, and the liquid is rotated and reaches the cavitation generating section 44C.

[0032] 2(C) shows a third example of a cavitation generation section 44C, in which four fin units (441-444) are attached around a support column 45. Each fin unit consists of two fin stages: a first fin stage 44p and a second fin stage 44q. A triangular fin 49C (see in particular the enlarged cross section in the dotted circle) has a triangular cross section and is attached at an angle of θ1 to the axial direction of the support column 45.

[0033] The second-stage fin section 44q of the fin stage is attached at an angle θ2 relative to the first-stage fin section 44p of the fin stage. The triangular fins 49C of the first-stage fin section 44p of the fin stage have their bases located on the upstream side, while the triangular fins 49C of the second-stage fin section 44q have their bases located on the downstream side. As with the first example, in the third example, adjacent fin units (441-444) are attached at an angle θ3. The cavitation generating section 44C converts the ozone mixed liquid into a long-lasting ozone liquid containing microbubbles with a bubble diameter of 200 nm or less.

[0034] Example 4 3(A) shows a fourth example of a static mixer 40D having a screw-type swirling flow generating section 41 and a cavitation generating section 44D having teardrop-shaped fins 49D with a teardrop-shaped cross section. The flow velocity of the ozone-mixed liquid increases in the screw-type swirling flow generating section 41, and the liquid is rotated and reaches the cavitation generating section 44D.

[0035] 3A shows a fourth example of a cavitation generation section 44D. Four fin units (441-444) are attached around a support column 45. Each fin unit consists of two fin stages: a first fin stage 44p and a second fin stage 44q. A teardrop-shaped fin 49D (see the enlarged cross section in the dotted circle in particular) is attached at an angle θ1 to the axial direction of the support column 45. The cross-sectional area of ​​the teardrop-shaped fin 49D is, for example, 2-4 mm in length, with a large bulge of R0.2-0.4 mm and a small bulge of R0.05-0.1 mm.

[0036] An enlarged view of the side of the tube TU is shown in the lower right of FIG. 3(A). In the first to sixth, eleventh, and twelfth examples described below, the inner diameter area of ​​the tube TU is approximately three times the cross-sectional area of ​​the support 45. Conversely, the cross-sectional area of ​​the support 45 is approximately 1 / 3 of the inner diameter area of ​​the tube TU. This area ratio is efficient for ensuring the flow rate of the ozone-mixed liquid, generating cavitation, and destroying the bubbles to generate microbubbles (with a bubble diameter of 200 nm or less). If the area ratio is greater than 3 / 5, the flow rate will be high but the flow rate will not be sufficient. If the area ratio is less than 1 / 4, the flow rate will be sufficient but the flow rate will be too slow. For this reason, the cross-sectional area of ​​the support 45 is preferably 3 / 5 to 1 / 4 of the inner diameter area of ​​the tube TU, and more preferably approximately 1 / 3.

[0037] As in the first to third examples, the second-stage fin section 44q of the fin stage is attached at an angle θ2 relative to the first-stage fin section 44p of the fin stage. The teardrop-shaped fins 49D of the first-stage fin section 44p of the fin stage have bulges on the upstream side, while the teardrop-shaped fins 49D of the second-stage fin section 44q have bulges on the downstream side. As in the first to third examples, in the fourth example, adjacent fin units (441-444) are also attached at an angle θ3. The cavitation generator 44D converts the ozone-mixed liquid into a long-lasting ozone liquid containing microbubbles with a bubble diameter of 200 nm or less.

[0038] Example 5 3(B) shows a fifth example of a static mixer 40E, which includes a screw-type swirl flow generating section 41 and a cavitation generating section 44E having bow-shaped fins 49E with a bow-shaped cross section. The flow velocity of the ozone-mixed liquid increases in the screw-type swirl flow generating section 41, and the liquid is rotated and reaches the cavitation generating section 44E.

[0039] The cavitation generation section 44E of the fifth example shown in FIG. 3(B) has four fin units (441-444) attached around the support column 45, and each fin unit consists of two fin stages: a first fin stage 44p and a second fin stage 44q. The bow-shaped fin 49E, which has a bow-shaped cross section (see the enlarged cross section in the dotted circle in particular), is attached at an angle θ1 with respect to the axial direction of the support column 45. While the first to fourth examples have an upper surface 49u and a lower surface 49d symmetrical with respect to the direction of flow of the ozone-mixed liquid, the bow-shaped fin 49E of the fifth example has an upper surface 49u and a lower surface 49d that are not symmetrical with respect to the direction of flow of the ozone-mixed liquid. Similarly, the sixth to twelfth examples also have an upper surface 49u and a lower surface 49d that are not symmetrical with respect to the direction of flow of the ozone-mixed liquid.

[0040] As in the first to third examples, the second-stage fin section 44q of the fin stage is attached at an angle θ2 relative to the first-stage fin section 44p of the fin stage. The upper surface 49u and the lower surface 49d of the bow-shaped fin 49E of the first-stage fin section 44p are reversed to those of the bow-shaped fin 49E of the second-stage fin section 44q. As in the first to third examples, the adjacent fin units (441-444) in the fifth example are also attached at an angle θ3. The cavitation generating unit 44E converts the ozone mixed liquid into a long-lasting ozone liquid containing microbubbles with a bubble diameter of 200 nm or less.

[0041] Example 6 A static mixer 40F of a sixth example shown in Figure 3(C) has a screw-type swirl flow generating section 41 and a cavitation generating section 44F having flight wing fins 49F with a cross-sectional shape of a flight wing. The flow velocity of the ozone mixed liquid increases in the screw-type swirl flow generating section 41, and the ozone mixed liquid is rotated and reaches the cavitation generating section 44F.

[0042] The cavitation generation section 44F of the sixth example shown in Figure 3(C) has four fin units (441-444) attached around a support 45, and each fin unit consists of two fin stages: a first fin stage 44p and a second fin stage 44q. The length L1 of the tube TU is 45 mm. The distance L3 between one fin unit and the adjacent fin unit is 1 mm, and the distance L4 between the first fin stage 44p and the second fin stage 44q is also 1 mm.

[0043] The flight wing fin 49F, whose cross section resembles a flight wing (see in particular the enlarged cross section in the dotted circle), is attached at an angle of θ1 (15 degrees) to the axial direction of the strut 45. The flight wing fin 49F of the sixth example has an asymmetrical upper surface 49u and a lower surface 49d, and its cross-sectional area is, for example, 2-4 mm in length, with the upper surface 49u having a curvature of approximately 5 mm and the lower surface 49d having a curvature of approximately 7.5 mm, with the larger bulge having a radius of 0.2-0.4 mm and the smaller bulge having a radius of 0.05-0.1 mm.

[0044] The second stage fin section 44q of the fin stage is attached at an angle θ2 (24 degrees) relative to the first stage fin section 44p of the fin stage. The upper surface 49u and the lower surface 49d of the flight vane fins 49F of the first stage fin section 44p and the flight vane fins 49F of the second stage fin section 44q are arranged in reverse. Adjacent fin units (441-444) of the sixth example are attached rotated by an angle θ3 (9 degrees). The cavitation generating section 44F converts the ozone mixed liquid into a long-lasting ozone liquid containing microbubbles with a bubble diameter of 200 nm or less.

[0045] Example 7 The static mixer 40G of the seventh example shown in Figure 4(A) has a screw-type swirl flow generating section 41 and a cavitation generating section 44G having flying wing fins 49F with a cross-sectional shape of a flying wing. The flow velocity of the ozone mixed liquid increases in the screw-type swirl flow generating section 41, and the ozone mixed liquid is rotated and reaches the cavitation generating section 44G.

[0046] The seventh example of a cavitation generation section 44G shown in Figure 4(A) has five fin units (441-445) attached around a support 45, and each fin unit consists of two fin stages: a first fin stage 44p and a second fin stage 44q. The length L2 of the tube TU is 70 mm. The distance L3 between one fin unit and the adjacent fin unit is 5 mm, and the distance L4 between the first fin stage 44p and the second fin stage 44q is 1 mm.

[0047] The flying wing fin 49F, which has a cross section of a flying wing (see in particular the enlarged cross section in the dotted circle), is attached at an angle θ1a (40 degrees) to the axial direction of the strut 45. The flying wing fin 49F of the seventh example has the same shape as the flying wing fin 49F of the sixth example.

[0048] The second stage fin section 44q of the fin stage is attached at an angle θ2 (30 degrees) relative to the first stage fin section 44p of the fin stage. The upper surface 49u and the lower surface 49d of the flight vane fins 49F of the first stage fin section 44p and the flight vane fins 49F of the second stage fin section 44q are arranged in reverse. Adjacent fin units (441-445) of the seventh example are attached rotated by an angle θ3 (9 degrees). The cavitation generating section 44F converts the ozone mixed liquid into a long-lasting ozone liquid containing microbubbles with a bubble diameter of 200 nm or less.

[0049] An enlarged side view of the tube TU is shown in the lower right of Figure 4(A). The inner diameter area of ​​the tube TU is approximately twice the cross-sectional area of ​​the support pillars 45. Conversely, the cross-sectional area of ​​the support pillars 45 is approximately half the inner diameter area of ​​the tube TU. In the eighth to tenth examples, the cross-sectional area of ​​the support pillars 45 is also approximately half the inner diameter area of ​​the tube TU.

[0050] In other words, the cavitation generation section 44G of the seventh example differs from the cavitation generation section 44F of the sixth example in the following five points. First, the θ1a angle of the flying wing fin 49F relative to the axial direction of the strut 45 is increased from 15 degrees to 40 degrees. Second, the distance L3 between one fin unit and the adjacent fin unit is increased from 1 mm to 5 mm, increasing the overall length L2. Third, the θ2 angle between the first stage fin section 44p and the second stage fin section 44q is increased from 24 degrees to 30 degrees. Fourth, the cross-sectional area of ​​the strut 45 and the inner diameter area of ​​the tube TU are reduced from 1 / 3 to 1 / 2, narrowing the flow path. Fifth, the length of the cavitation generation section 44G is increased, with the length L2 of the tube TU being 70 mm.

[0051] Example 8 The static mixer 40H of the eighth example shown in Figure 4(B) has a screw-type swirl flow generating section 41 and a cavitation generating section 44H having flying wing fins 49F with a cross-sectional shape of a flying wing. The flow velocity of the ozone mixed liquid increases in the screw-type swirl flow generating section 41, and the ozone mixed liquid is rotated and reaches the cavitation generating section 44H.

[0052] The cavitation generating section 44H of the eighth example shown in Figure 4(B) differs from the cavitation generating section 44G of the seventh example in that it is attached at an angle θ1b (50 degrees) with respect to the axial direction of the support 45, but otherwise has the same configuration.

[0053] Example 9 The ninth example of the static mixer 40I shown in Figure 5(A) has a screw-type swirl flow generating section 41 and a cavitation generating section 44I having flying wing fins 49F with a cross-sectional shape of a flying wing. The flow velocity of the ozone mixed liquid increases in the screw-type swirl flow generating section 41, and the ozone mixed liquid is rotated and reaches the cavitation generating section 44I.

[0054] The ninth example of the cavitation generating section 44I shown in Figure 5(A) differs from the eighth example of the cavitation generating section 44H in that the distance L3 between one fin unit and the adjacent fin unit is changed from 5 mm to 4 mm, but the other configurations are the same.

[0055] Example 10 5(B) shows a tenth example of a static mixer 40J, which includes a screw-type swirling flow generating section 41 and a cavitation generating section 44J having flight wing fins 49F with a cross-sectional shape of a flying wing. The flow velocity of the ozone-mixed liquid increases in the screw-type swirling flow generating section 41, and the liquid is rotated and reaches the cavitation generating section 44J.

[0056] The tenth example of a cavitation generation section 44J shown in Figure 5(B) has seven fin units (441-447) attached around a support 45. Each fin unit consists of two fin stages: a first fin stage 44p and a second fin stage 44q. The length L2 of the tube TU is 70 mm. The distance L3 between one fin unit and the adjacent fin unit is 1 mm, and the distance L4 between the first fin stage 44p and the second fin stage 44q is also 1 mm.

[0057] The flight wing fins 49F, whose cross section resembles a flight wing, are attached at an angle θ1a (45 degrees) relative to the axial direction of the strut. The second stage fin section 44q of the fin stage is attached at an angle θ2 (30 degrees) relative to the first stage fin section 44p of the fin stage. The upper surface 49u and lower surface 49d of the flight wing fins 49F of the first stage fin section 44p and the second stage fin section 44q are reversed. Adjacent fin units (441-447) in the tenth example are attached rotated by an angle θ3 (9 degrees).

[0058] In other words, the cavitation generation section 44J of the tenth example differs from the cavitation generation section 44F of the sixth example in the following five points. First, the θ1a angle of the flying wing fin 49F relative to the axial direction of the strut 45 is increased from 15 degrees to 45 degrees. Second, there are seven fin units. Third, the θ2 angle between the first stage fin section 44p and the second stage fin section 44q is increased from 24 degrees to 30 degrees. Fourth, the cross-sectional area of ​​the strut 45 and the inner diameter area of ​​the tube TU are reduced from 1 / 3 to 1 / 2, narrowing the flow path. Fifth, the length of the cavitation generation section 44G is increased, with the length L2 of the tube TU being 70 mm.

[0059] Examples 7 to 9 are particularly effective when the ozone liquid generator 100 generates an ozone mixture at a rate of, for example, 5 liters per minute or more. To increase the flow rate, the pressure in the liquid transport unit 10 (see FIG. 1) of the ozone liquid generator 100 is increased. As the pressure increases, pressure is exerted on the microbubbles of 200 nm or less created in the static mixer 40, resulting in the pressure being released at the outlet of the static mixer 40. When this pressure is released, the pressure on the microbubbles is also released, causing the ozone contained within the microbubbles to expand, resulting in the ozone itself self-destructing. To prevent this self-destruction, Examples 7 to 9 space the fins that act as resistance within the static mixer 40, preventing a pressure increase. Increasing the flow rate weakens the swirling of the ozone mixture, so the fin angle is increased to 40 degrees or more to ensure a swirling flow.

[0060] Example 11 The static mixer 40K of the eleventh example shown in Figure 6(A) has a swirling flow generating section 42A using a swirling plate and a cavitation generating section 44F having flying wing fins 49F with a cross-sectional shape of a flying wing. The cavitation generating section 44F is the same as that of the sixth example. The flow velocity of the ozone mixed liquid increases in the swirling flow generating section 42A, causing it to rotate and reach the cavitation generating section 44F.

[0061] The swirling flow generating unit 42A using a swirling plate is disposed in a second tube TU2 having an axis AX2 that is different from the axis AX1 of the first tube TU1 through which the ozone-mixed liquid flows. The inner diameter φB of the first tube TU1 and the inner diameter φB of the second tube TU2 shown in FIG. 6A are the same, e.g., 3 mm to 10 mm. However, the inner diameter φA of the second tube TU2, in which the swirling plate of the swirling flow generating unit 42A is disposed, is 10 to 30% larger, e.g., 5 to 15 mm.

[0062] FIG. 6A shows a cross-sectional view of the swirl flow generating section along the line AA and an enlarged view (within the dotted circle). The swirl plate of the swirl flow generating section 42A is cylindrical with an outer diameter φC and an inner diameter φB smaller than the inner diameter φA of the second tube TU2. The cylindrical shape has long holes Ho extending in the axial direction. The long holes Ho are evenly spaced diagonally around the circumference of the cylindrical shape. While the enlarged view shows three long holes Ho, two to five long holes Ho are preferred. The ozone-mixed liquid entering the first tube TU1 flows through the gap between the inner diameter φA of the second tube TU2 and the outer diameter φC of the cylindrical shape, rotating. Then, it enters the diagonally opened long holes Ho and heads toward the center Hc of the cylindrical shape. The ozone-mixed liquid entering the center Hc is rotated within the inner diameter φB of the cylindrical shape and heads toward the cavitation generating section 44F. The cavitation generating section 44F is the same as the sixth example. The cavitation generating unit 44F converts the ozone mixed liquid into a long-lasting ozone liquid having microbubbles with a bubble diameter of 200 nm or less.

[0063] Example 12 The static mixer 40L of the twelfth example shown in Figure 6(B) has a swirling flow generator 42B using a swirl plate and a cavitation generator 44FB with flying fin 49FB, which has a cross-sectional shape similar to that of a flying wing. The cavitation generator 44FB differs significantly in that six fin units (441-446) are attached around the support 45. The flying fin 49FB (see the enlarged cross-section in the dotted circle, in particular) is attached at an angle θ1 relative to the axial direction of the support 45, but is 1.1-1.4 times larger than those of the sixth or eleventh examples. In other words, the larger diameter and length of the cavitation generator 44FB also increases the diameter of the swirling flow generator 42B. The ozone-mixed liquid flows faster in the swirling flow generator 42B, causing it to rotate and reach the cavitation generator 44FB.

[0064] The swirling flow generating unit 42B using a swirling plate is disposed in a second tube TU2 having an axis AX2 that is different from the axis AX1 of the first tube TU1 through which the ozone-mixed liquid flows. The inner diameter φB of the first tube TU1 shown in FIG. 6B is the same as the inner diameter φB of the outlet of the second tube TU2, e.g., 3 mm to 10 mm. The inner diameter φD of the second tube TU2 in which the cavitation generating unit 44FB is disposed is approximately 1.5 times the inner diameter φB, e.g., 5 mm to 15 mm. The inner diameter φA of the second tube TU2 in which the swirling plate of the swirling flow generating unit 42B is disposed is 10 to 30% larger than the inner diameter φD, e.g., 6 to 20 mm.

[0065] The swirl plate of the swirl flow generating unit 42B is cylindrical as described in the 11th example and has basically the same structure, only the size is different. When the ozone mixed liquid enters the first tube TU1 and enters the second tube TU2, it flows while rotating around the swirl plate and heads toward the center of the cylindrical shape. The ozone mixed liquid that has entered the center is rotated within the cylindrical shape and heads toward the cavitation generating unit 44FB. The cavitation generating unit 44FB converts the ozone mixed liquid into a long-lasting ozone liquid containing microbubbles with a bubble diameter of 200 nm or less.

[0066] <<About long-lasting ozone liquid>> As explained in Figure 1, the static mixer 40 of this embodiment is arranged after the gas-liquid mixer 30 of any ozone liquid generator. The arrangement results of the first example (40A) to the twelfth example (40L) are shown in Tables 1 and 2 below. Note that the type indicates the fin shape of the swirl flow generating section 42 and the cavitation generating section 44 described above. Also, the ozone concentration (ppm) indicates the concentration immediately after collection, and from 15 minutes after collection to 72 hours after collection. [Table 1] [Table 2]

[0067] The comparative example is an example in which the static mixer 40 was not attached to the ozone liquid generator. The ozone mixed liquid generated only by the gas-liquid mixing section 30 of the ozone liquid generator had an ozone concentration of 1.5 ppm even immediately after collection, and 0.1 ppm after 30 minutes. After one hour, the concentration could not be detected. The bubbles in the ozone mixed liquid were 50 μm to several μm in diameter, and it is thought that the bubbles rose to the liquid surface over time and burst. The ozone concentration was measured using Kyoritsu Chemical Research Institute's Pack Test (Ozone) WAK-O3 and Digital Pack Test (Ozone) DPM2-O3.

[0068] When the static mixer 40A (first example) was attached to the same ozone liquid generator, the ozone concentration after sampling was 4.8 ppm, and even after 72 hours, it was only 3.5 ppm. The static mixer 40A generates long-lasting ozone liquid by causing ozone gas to exist in the ozone mixed liquid as microbubbles with a diameter of 200 nm or less. When ozone gas becomes microbubbles with a diameter of 200 nm or less, the microbubbles rise at a slow rate and have excellent dissolving ability, so it is believed that the long-lasting ozone liquid still shows a high ozone concentration even after 72 hours.

[0069] When the static mixer 40B (Example 2) was installed on the same ozone liquid generator, the ozone concentration after collection was 4.8 ppm, and even after 72 hours, it was only 2.3 ppm. Similarly, when the static mixer 40C (Example 3) was installed, the ozone concentration after collection was 4.7 ppm, and even after 72 hours, it was only 2.3 ppm. Similarly, when the static mixer 40D (Example 4) was installed, the ozone concentration after collection was 4.5 ppm, and even after 72 hours, it was only 2.3 ppm. Compared to the static mixer 40A (Example 1: rectangular), the static mixer 40B (Example 2: trapezoidal), the static mixer 40C (Example 3: triangular), and the static mixer 40D (Example 4: drop shape) had slightly lower ozone concentrations after collection and after 72 hours. It can be assumed that rectangular fin cross-sectional shapes are more likely to generate cavitation.

[0070] When the static mixer 40E (Example 5) was installed on the same ozone liquid generator, the ozone concentration after sampling was 4.8 ppm, and even after 72 hours, it was only 2.9 ppm. Similarly, when the static mixer 40F (Example 6) was installed, the ozone concentration after sampling was 4.8 ppm, and even after 72 hours, it was only 2.5 ppm. The fin shapes of the static mixer 40A (Example 1: rectangular) and the static mixer 40D (Example 4: drop) were symmetrical on the top and bottom with respect to the flow of the ozone mixed liquid, while the fin shapes of the static mixer 40E (Example 5: bow-shaped) and the static mixer 40F (Example 6: flying wing) were asymmetrical on the top and bottom with respect to the flow of the ozone mixed liquid. Therefore, it can be inferred that fins with a rectangular cross-sectional shape are more likely to generate cavitation.

[0071] Static mixer 40F (Example 6) through static mixer 40J (Example 10) are flying wings of the same size and shape. Static mixer 40G (Example 7) through static mixer 40J (Example 9) maintain higher ozone concentrations even after 48 or 72 hours compared to static mixer 40F (Example 6). On the other hand, static mixer 40J (Example 10) has a lower ozone concentration 72 hours after collection compared to static mixer 40F (Example 6). It can be inferred that when there are seven fin units, as in static mixer 40J (Example 10), the pressure increases, causing the ozone contained in the microbubbles to expand, resulting in the self-destruction of the ozone itself.

[0072] When the static mixer 40K (Example 11) was attached to the same ozone liquid generator, the ozone concentration after sampling was 4.8 ppm, and even after 72 hours, the concentration was 3.1 ppm. The difference between the static mixer 40F (Example 6) and the static mixer 40K (Example 11) is the difference between the swirl flow generating section 41 and the swirl flow generating section 42A. For this reason, it can be assumed that the swirl flow generating section 42A increases the flow velocity or swirl flow more than the swirl flow generating section 41.

[0073] When the static mixer 40L (Example 12) was attached to the same ozone liquid generator, the ozone concentration was 4.5 ppm after sampling, and 1.2 ppm after 72 hours. The difference is that the cavitation generating section FB of the static mixer 40FB (Example 12) is relatively larger than the cavitation generating section of the static mixer 40K (Example 11). It can be assumed that the larger cavitation generating section FB has reduced the flow rate of the ozone mixed liquid, making it difficult to generate cavitation and mix.

[0074] From the ozone concentrations after the passage of time in the first example (40A) to the twelfth example (40L), the static mixer 40 of this embodiment can preserve ozone gas in the solution for a long period of time by making the bubbles of ozone gas contained in the ozone mixed solution smaller. [Explanation of symbols]

[0075] 100...Ozone liquid generator 10...liquid conveying section, 20...ozone gas conveying section, 30...gas-liquid mixing section, 40...static mixer 50...gas-liquid separation section, 60...waste gas treatment section 41...screw-type swirl flow generating part, 42 (42A, 42B) swirl flow generating part using a swirl plate 44...cavitation generation section, 44p...first stage fin section, 44q...second stage fin section 441-446...Fin unit, 45...Support 49 (49A, 49B, 49C, 49D, 49E, 49F, 49FB)...Fin TU, TU1, TU2...Tube Ho: Long hole Hc: Center of cylindrical shape

Claims

1. A static mixing device for producing a long-lasting ozone liquid in which ozone gas is maintained for a long period of time from an ozone mixed liquid containing ozone gas, a stationary swirl flow generating unit disposed within the first tube, which generates a swirl flow in the ozone mixed liquid conveyed from the first tube; a stationary cavitation generating unit that generates cavitation in the ozone mixed liquid swirled by the swirling flow generating unit and is disposed within the first tube, the cavitation generating unit includes a shaft portion, a first unit in which a predetermined number of fins are arranged around the shaft portion at a first angle with respect to a direction of the first tube, and a second unit in which a predetermined number of fins are arranged around the shaft portion at the first angle, A static mixing device for producing long-lasting ozone liquid, wherein the first unit and the second unit are installed at a second angle different from the first angle.

2. 2. The static mixing device for producing long-lasting ozone liquid according to claim 1, wherein the swirling flow generating section has an outer diameter equal to the inner diameter of the first tube and is cylindrical in shape with a screw groove formed on its outer periphery.

3. A static mixing device for producing a long-lasting ozone liquid in which ozone gas is maintained for a long period of time from an ozone mixed liquid containing ozone gas, a swirling flow generating section having a swirling plate disposed in a second tube having an axis centered on a position different from the axis of the first tube, and generating a swirling flow in the ozone mixed liquid conveyed from the first tube; a stationary cavitation generating unit that generates cavitation in the ozone mixed liquid swirled by the swirling flow generating unit and is disposed in the second tube, the cavitation generating unit includes a shaft portion, a first unit in which a predetermined number of fins are arranged around the shaft portion at a first angle with respect to a direction of the first tube, and a second unit in which a predetermined number of fins are arranged around the shaft portion at the first angle, A static mixing device for producing long-lasting ozone liquid, wherein the first unit and the second unit are installed at a second angle different from the first angle.

4. 4. The static mixer for producing long-lasting ozone liquid according to claim 3, wherein the rotating plate has a plurality of elongated holes extending in the axial direction of the cylindrical shape, penetrating from the outer periphery to the inner periphery.

5. 5. A static mixing device for producing long-lasting ozone liquid according to claim 1, wherein the first unit and the second unit each have a first stage fin section having the predetermined number of fins and a second stage fin section having the predetermined number of fins and arranged downstream of the first stage fin section, and the first stage fin section and the second stage fin section are installed at a third angle different from the first angle.

6. 5. The static mixer for producing long-lasting ozone liquid according to claim 1, wherein the cross-sectional shape of the fin is any one of rectangular, trapezoidal, triangular, and teardrop-shaped.

7. 5. A static mixing device for producing long-lasting ozone liquid according to claim 1, wherein the cross-sectional shape of the fin is either an arched shape or a flying wing shape, in which the surface facing upward is asymmetrical with respect to the direction in which the ozone mixed liquid flows.

8. 3. A static mixing device for producing long-lasting ozone liquid as described in claim 1 or claim 2, wherein the cross-sectional area of ​​the shaft portion of the cavitation generating portion is 3 / 5 to 1 / 4 of the inner diameter area of ​​the second tube.

9. 5. A static mixing device for producing long-lasting ozone liquid according to claim 3, wherein the cross-sectional area of ​​the shaft portion of the cavitation generating portion is 3 / 5 to 1 / 4 of the inner diameter area of ​​the second tube.

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