Fine bubble generator.

Abstract

To provide a fine bubble generator that can be easily attached to existing water pipes, shower heads, etc., while stably generating fine bubbles. [Solution] A fine bubble generator capable of generating fine bubbles from a gas dissolved in a liquid, comprising: an outer cylinder portion having a flow path formed in the longitudinal direction from the base end to the tip through which the liquid flows; and an inner cylinder portion formed in a cylindrical shape and disposed in the flow path, wherein the flow path is formed in a cylindrical shape and has an inner cylinder arrangement region in which the inner cylinder portion is disposed, and a pressurizing region located on the tip side of the inner cylinder arrangement region and pressurizing the liquid, wherein the inner cylinder portion has a plurality of water passages in the side wall portion through which the liquid passes in a direction inclined by a first angle with respect to the radial direction when viewed from the longitudinal direction, and the first angle is from 1 degree to 85 degrees.

Description

Technical Field

[0001] The present invention relates to a fine bubble generator.

Background Art

[0002] In recent years, fine bubbles contained in liquids such as water have attracted attention. Fine bubbles generally refer to bubbles with a diameter of less than 100 μm. Fine bubbles have a large internal bubble pressure due to a small gas-liquid interface area (bubble surface area), and also have a slow rising speed in the liquid. For example, by using warm water containing fine bubbles in a bathtub, there are massage effects and heat effects during bathing. In addition, since fine bubbles have a surfactant action, for example, by using water containing fine bubbles for washing, the detergency is improved. In addition, fine bubbles have a water purification effect of attaching dirt floating in the liquid to the bubbles and floating them to the water surface. In addition, fine bubbles have a bioactive effect of supplying bubbles containing oxygen or the like to organisms.

[0003] For the generation principle of fine bubbles, for example, there are a pressure dissolution method in which a gas is dissolved in a liquid under high pressure and then decompressed to precipitate the gas in the liquid as fine bubbles, a turbulent flow method in which a gas-liquid two-phase liquid is mixed and sheared to cause an unstable state of the gas-liquid interface to generate fine bubbles, generation and collapse of cavitation bubbles in the liquid, or by applying a rapid pressure fluctuation such as ultrasonic waves or shock waves to pre-added micro-order bubbles to expand them and then pressurizing and collapsing them to generate fine bubbles, such as a crushing method.

[0004] For example, Patent Document 1 describes a fine bubble generator having a gas dissolution tank and generating fine bubbles by pressure dissolution in the gas dissolution tank.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

[0006] However, the fine bubble generator described in Patent Document 1 has a complex configuration, including the provision of a gas dissolution tank. Therefore, it is difficult to install it on existing water pipes or shower heads, for example.

[0007] The present invention aims to provide a fine bubble generator that can be easily attached to existing water pipes, shower heads, etc., while stably generating fine bubbles. [Means for solving the problem]

[0008] To solve the above problems, the present invention proposes the following means. A fine bubble generator according to one aspect of the present invention is a fine bubble generator capable of generating fine bubbles from a gas dissolved in a liquid, comprising: an outer cylinder portion having a flow path formed therein in the longitudinal direction from the base end to the tip through which the liquid flows; and an inner cylinder portion formed in a cylindrical shape and disposed in the flow path, wherein the flow path is formed in a cylindrical shape and has an inner cylinder arrangement region in which the inner cylinder portion is disposed, and a pressurizing region located on the tip side of the inner cylinder arrangement region and pressurizing the liquid, and the inner cylinder portion has a plurality of water passages in the side wall portion through which the liquid passes in a direction inclined by a first angle with respect to the radial direction when viewed from the longitudinal direction, the first angle being between 1 and 85 degrees. [Effects of the Invention]

[0009] According to the present invention, it is possible to provide a fine bubble generator that can be easily attached to existing water pipes, shower heads, etc., while stably generating fine bubbles. [Brief explanation of the drawing]

[0010] [Figure 1] This is a perspective view showing a fine bubble generator according to this embodiment. [Figure 2] This is a side view showing the outer cylinder portion. [Figure 3] This is a side view showing the inner cylinder section. [Figure 4] This is a cross-sectional view along the line F4-F4 of the inner cylindrical portion shown in Figure 3. [Figure 5] This is a detailed view of the area indicated by the dashed line A5 in the inner cylinder shown in Figure 4. [Figure 6] This is a side view showing the inner cylinder portion of a modified example. [Figure 7] This figure shows the measurement results of the particle size of fan bubbles generated by Example 1, Example 2, Comparative Example 1, and Comparative Example 2. [Figure 8] This figure shows the measurement results of the number of particles in the fan bubbles generated by Example 1, Example 2, Comparative Example 1, and Comparative Example 2. [Modes for carrying out the invention]

[0011] Hereinafter, a fine bubble generator according to an embodiment will be described with reference to the drawings. In the following description, components having the same or similar functions will be denoted by the same reference numerals. Duplication of these components may be omitted.

[0012] [Fine Bubble Generator 100] The fine bubble generator 100 according to this embodiment will be described with reference to Figures 1 to 6. First, the fine bubble generator 100 as a whole will be described. However, the fine bubble generator 100 does not need to have all of the configurations described below, and some configurations may be omitted as appropriate.

[0013] Figure 1 is a perspective view showing the fine bubble generator 100 according to this embodiment. The fine bubble generator 100 is a device capable of generating fine bubbles from a gas dissolved in a liquid. Fine bubbles generally refer to bubbles with a diameter of less than 100 μm. The fine bubble generator 100 is a device that can be attached to a water pipe. As shown in FIG. 1, the fine bubble generator 100 includes an outer cylinder portion 1 and an inner cylinder portion 2.

[0014] In the present embodiment, the longitudinal direction of the outer cylinder portion 1 is defined as the longitudinal direction L of the fine bubble generator 100. Of the longitudinal direction L, one is defined as the tip side L1 and the other is defined as the base end side L2.

[0015] FIG. 2 is a side view showing the outer cylinder portion 1. As shown in FIGS. 1 and 2, the outer cylinder portion 1 is a member formed in a cylindrical shape. Inside the outer cylinder portion 1, a flow path 3 through which a liquid flows in the longitudinal direction L from the base end side L2 toward the tip side L1 is formed. The flow path 3 is formed from the base end 1t to the tip 1s of the outer cylinder portion 1 and is a hole penetrating the outer cylinder portion 1 in the longitudinal direction L. The flow path 3 has an inner cylinder arrangement region 31 and a pressurization region 32 located on the tip side L1 of the inner cylinder arrangement region 31.

[0016] In the present embodiment, the radial direction of the outer cylinder portion 1 is defined as the radial direction R of the fine bubble generator 100, and the circumferential direction of the outer cylinder portion 1 is defined as the circumferential direction C of the fine bubble generator 100.

[0017] The inner cylinder arrangement region 31 is a region where the inner cylinder portion 2 is arranged. The inner cylinder arrangement region 31 is formed in a cylindrical shape. The inner diameter of the inner cylinder arrangement region 31 is formed larger than the outer diameter of the inner cylinder main body portion 21 of the inner cylinder portion 2 described later. The inner diameter of the inner cylinder arrangement region 31 is smaller than the outer diameter of the flange portion 22 of the inner cylinder portion 2 described later.

[0018] On the base end side L2 of the inner cylinder arrangement region 31, a flange locking portion 33 for locking the flange portion 22 of the inner cylinder portion 2 described later is formed. The flange locking portion 33 is formed in a circular shape when viewed from the longitudinal direction L. The inner diameter of the flange locking portion 33 is formed slightly larger than the outer diameter of the flange portion 22.

[0019] The pressurizing region 32 is a region that pressurizes the liquid flowing in the longitudinal direction L. The pressurizing region 32 is located on the tip side L1 with respect to the inner cylinder arrangement region 31. The pressurizing region 32 communicates with the inner cylinder arrangement region 31 in the longitudinal direction L. The pressurizing region 32 is formed in a circular shape when viewed from the longitudinal direction L. The inner diameter of the pressurizing region 32 decreases as it advances toward the tip side L1, and then increases again as it advances toward the tip side L1. The pressurizing region 32 has a first tapered portion 32a, a reduced-diameter portion 32b located on the tip side L1 with respect to the first tapered portion 32a, and a second tapered portion 32c located on the tip side L1 with respect to the reduced-diameter portion 32b.

[0020] The first tapered portion 32a gradually pressurizes the liquid flowing in the longitudinal direction L. The first tapered portion 32a constitutes the base end of the pressurizing region 32. The first tapered portion 32a is formed in a circular shape when viewed from the longitudinal direction L. The inner diameter of the first tapered portion 32a decreases as it advances toward the tip side L1. The inner diameter of the tip of the first tapered portion 32a is smaller than the inner diameter of the base end of the first tapered portion 32a. The first tapered portion 32a is formed in a frustum of a cone shape.

[0021] The reduced-diameter portion 32b pressurizes the liquid flowing in the longitudinal direction L. The reduced-diameter portion 32b is located on the tip side L1 with respect to the first tapered portion 32a. The reduced-diameter portion 32b communicates with the first tapered portion 32a. The reduced-diameter portion 32b is formed in a circular shape when viewed from the longitudinal direction L. The inner diameter of the reduced-diameter portion 32b is smaller than the inner diameter of the inner cylinder arrangement region 31. The reduced-diameter portion 32b is formed in a cylindrical shape.

[0022] The second tapered portion 32c decompresses the liquid flowing in the longitudinal direction L. The second tapered portion 32c is located on the tip side L1 with respect to the reduced-diameter portion 32b. The second tapered portion 32c is formed in a circular shape when viewed from the longitudinal direction L. The inner diameter of the second tapered portion 32c increases as it advances toward the tip side L1. The inner diameter of the tip of the second tapered portion 32c is larger than the inner diameter of the base end of the second tapered portion 32c. The second tapered portion 32c is formed in a frustum of a cone shape.

[0023] A female screw 1a is formed on the inner surface of the base end of the outer cylinder portion 1. The female screw 1a is shaped to screw into the male screw of the water pipe to which the fine bubble generator 100 is attached. A male screw 1b is formed on the outer surface of the tip end of the outer cylinder portion 1. The male screw 1b is shaped to screw into the female screw to which the fine bubble generator 100 is attached.

[0024] The outer cylinder portion 1 is formed by including a synthetic resin. For example, the outer cylinder portion 1 is formed by including polyvinyl chloride.

[0025] Figure 3 is a side view showing the inner cylinder portion 2. As shown in Figures 1 and 3, the inner cylinder portion 2 is formed in a cylindrical shape and is a component positioned in the inner cylinder arrangement region 31 of the flow path 3. The inner cylinder portion 2 is a component that can be attached to and detached from the outer cylinder portion 1. The inner cylinder portion 2 has an inner cylinder body portion 21 and a flange portion 22 provided at the base end of the inner cylinder body portion 21. The inner cylinder body portion 21 and the flange portion 22 are formed integrally.

[0026] The inner cylinder body portion 21 is a cylindrical box-shaped member. A cylindrical space is formed inside the inner cylinder body portion 21. The inner diameter of the inner cylinder body portion 21 is smaller than the inner diameter of the water pipe to which the fine bubble generator 100 is installed. The base end L2 of the inner cylinder body portion 21 is open. The tip end L1 of the inner cylinder body portion 21 is closed. The inner cylinder body portion 21 has a cylindrical side wall portion 21a and a circular bottom wall portion 21b. The side wall portion 21a and the bottom wall portion 21b are formed integrally.

[0027] Figure 4 is a cross-sectional view of the inner cylinder portion 2 shown in Figure 3 along the line F4-F4. As shown in Figures 3 and 4, the side wall portion 21a has a plurality of water passage holes 4 through which liquid can pass. The plurality of water passage holes 4 penetrate from the outer surface 21s of the side wall portion 21a to the inside of the inner cylinder body portion 21. The plurality of water passage holes 4 are formed in a rectangular shape when viewed from the radial direction R. The cross-sectional area of ​​the plurality of water passage holes 4 is larger than the inner diameter of the inner cylinder body portion 21.

[0028] As shown in Figure 4, the multiple water passages 4 have a shape through which liquid passes in a direction inclined by a first angle D1 with respect to the radial direction R when viewed from the longitudinal direction L. The liquid passes along the inner surface 21t of the side wall portion 21a that forms the water passage 4. That is, the first angle D1 is the angle at which the inner surface 21t is inclined with respect to the radial direction R. The first angle D1 is preferably between 1 and 85 degrees. The first angle D1 is more preferably between 20 and 75 degrees. The first angle D1 is even more preferably between 40 and 65 degrees. In this embodiment, the first angle D1 is approximately 55 degrees.

[0029] As shown in Figure 4, the multiple water passages 4 are inclined in the same direction. In this embodiment, the inner surface 21t is inclined by a first angle D1 counterclockwise with respect to the radial direction R when viewed from the base end side L2, and the liquid that passes through the multiple water passages 4 rotates counterclockwise when viewed from the base end side L2. Note that the direction in which the multiple water passages 4 are inclined is not limited; it is sufficient that all water passages 4 are inclined in approximately the same direction. The liquid that passes through the multiple water passages 4 may rotate clockwise when viewed from the base end side L2.

[0030] Figure 5 is a detailed view of the area indicated by the dashed line A5 in Figure 4. The inner surface 21t, which forms the multiple water passage holes 4, is inclined by a second angle D2 with respect to the outer surface 21s when viewed from the longitudinal direction L, as shown in Figure 5. The second angle D2 is preferably between 5 and 89 degrees. The second angle D2 is more preferably between 15 and 70 degrees. The second angle D2 is even more preferably between 25 and 50 degrees. In this embodiment, the second angle D2 is approximately 35 degrees.

[0031] The cross-section of the side wall portion 21a is formed in a triangular shape, as shown in Figure 5. Viewed from the longitudinal direction L, the imaginary line V1 connecting the ends where the outer surface 21s of the side wall portion 21a are formed is inclined by a third angle D3 with respect to the inner surface 21t. The third angle D3 is preferably between 5 and 89 degrees. The third angle D3 is more preferably between 10 and 65 degrees. The third angle D3 is even more preferably between 15 and 40 degrees. In this embodiment, the third angle D3 is approximately 22.5 degrees.

[0032] Multiple water passage holes 4 are formed at equal intervals in the circumferential direction C. Multiple water passage holes 4 are formed to be approximately the same size. Multiple water passage holes 4 are formed to be approximately the same shape. Multiple water passage holes 4 are formed to be approximately rotationally symmetric when viewed from the longitudinal direction L. Eight water passage holes 4 are formed.

[0033] The flange portion 22 protrudes outward in the circumferential direction C from the base end of the inner cylinder body portion 21. The flange portion 22 is formed in a circular shape when viewed from the longitudinal direction L. The outer diameter of the flange portion 22 is larger than the outer diameter of the inner cylinder body portion 21.

[0034] The inner cylinder portion 2 is formed by including a synthetic resin. For example, the inner cylinder portion 2 is formed by including polyvinyl chloride.

[0035] [The operation of the Fine Bubble Generator 100] Next, we will explain the operation of the fine bubble generator 100.

[0036] When using the fine bubble generator 100, the inner cylinder portion 2 is placed in the inner cylinder arrangement area 31 of the outer cylinder portion 1, as shown in Figure 1. The inner cylinder portion 2 is positioned such that the longitudinal direction of the outer cylinder portion 1 and the longitudinal direction of the inner cylinder portion 2 substantially coincide with the longitudinal direction L. The inner cylinder portion 2 is positioned so that its opening faces the base end side L2. The inner cylinder portion 2 is inserted until the flange portion 22 abuts against the flange locking portion 33. A packing or the like may be interposed between the flange portion 22 and the flange locking portion 33.

[0037] The fine bubble generator 100 is attached to the water pipe with the inner cylinder portion 2 positioned in the inner cylinder arrangement region 31. Specifically, the fine bubble generator 100 is attached to the main valve of the building's water pipe. The fine bubble generator 100 is attached in a direction in which tap water (liquid) flows from the base end L2 to the tip end L1. The base end L2 of the fine bubble generator 100 is connected to the inlet side, and the tip end L1 is connected to the outlet side. The female screw 1a at the base end of the fine bubble generator 100 is screwed into the water pipe. The male screw 1b at the tip end of the fine bubble generator 100 is screwed into the water pipe.

[0038] In the fine bubble generator 100 attached to the water pipe, water flows from the base end L2 to the tip end L1 in the flow path 3.

[0039] Water flowing into the channel 3 flows into the interior through the opening L2 at the base end of the inner cylinder 2. Since the inner diameter of the inner cylinder 2 is smaller than the inner diameter of the water pipe, the water flowing into the interior of the inner cylinder 2 is pressurized. Since the tip end L1 of the inner cylinder 2 is closed by the bottom wall 21b, the water flowing into the interior of the inner cylinder 2 passes through the water passage hole 4.

[0040] Since the water passage hole 4 is smaller than the inner diameter of the inner cylinder portion 2, the water passing through the water passage hole 4 is further pressurized. As a result, the water passes through the water passage hole 4 with force. Since the water passage hole 4 is inclined at a first angle D1 with respect to the radial direction R, the water that has passed through the water passage hole with force flows vigorously toward the tip side L1 while forming a vortex that rotates in the circumferential direction C. Since the base end side L2 is closed by the flange portion 22, the water that has passed through the water passage hole 4 does not flow toward the base end side L2, but flows toward the tip side L1.

[0041] The water, flowing toward the tip side L1 while forming a vortex that rotates in the circumferential direction C, flows from the inner cylinder arrangement region 31 into the pressurized region 32. The water that has flowed into the pressurized region 32 passes through the first tapered portion 32a toward the tip side L1 from the base end side L2.

[0042] As water passes through the first tapered section 32a, it is pressurized as it approaches the tip side L1 because the inner diameter of the first tapered section 32a decreases as it moves towards the tip side L1. The pressurized water, while forming a vortex rotating in the circumferential direction C, passes through the reduced diameter section 32b.

[0043] The water that has passed through the reduced diameter section 32b flows into the second tapered section 32c. Since the inner diameter of the second tapered section 32c is larger than that of the reduced diameter section 32b, the water flowing into the second tapered section 32c is released from the pressure that was applied by the reduced diameter section 32b. As a result, the water flows vigorously towards the second tapered section 32c. Specifically, pressurized water, which is forming a vortex rotating in the circumferential direction C, flows vigorously towards the second tapered section 32c. At this time, the gas dissolved inside the water is sheared, and fine bubbles are generated.

[0044] The water containing fine bubbles passes through the second tapered section 32c and flows toward the water pipe. Since the fine bubble generator 100 according to this embodiment is attached to the main valve of the building's water pipe, the water containing fine bubbles flows into the water pipe inside the building. Therefore, the water used in the building contains fine bubbles.

[0045] According to the fine bubble generator 100 of this embodiment, the inner cylinder portion 2 has a plurality of water passage holes 4 in the side wall portion 21a through which liquid passes in a direction inclined by a first angle D1 with respect to the radial direction R when viewed from the longitudinal direction L. Since the first angle D1 is between 1 and 85 degrees, fine bubbles can be stably generated without a complex configuration. Therefore, it can be easily attached to existing water pipes, shower heads, etc., while still stably generating fine bubbles.

[0046] According to the fine bubble generator 100 of this embodiment, the inner surface 21t is inclined by a second angle D2 with respect to the outer surface 21s when viewed from the longitudinal direction L, and the second angle D2 is between 5 and 89 degrees. Therefore, fine bubbles can be stably generated without a complex configuration. As a result, it can be easily attached to existing water pipes, shower heads, etc., while still stably generating fine bubbles.

[0047] According to the fine bubble generator 100 of this embodiment, since the multiple water passage holes 4 are formed in a rectangular shape when viewed from the radial direction R, the flow of liquid passing through the multiple water passage holes 4 is stable, and fine bubbles can be stably generated. Therefore, fine bubbles can be stably generated without a complex configuration, and fine bubbles can be stably generated while being easily attached to existing water pipes, shower heads, etc.

[0048] According to the fine bubble generator 100 of this embodiment, since there are eight water passage holes 4, the flow of liquid passing through the water passage holes 4 is stable, and fine bubbles can be generated stably. Therefore, fine bubbles can be generated stably without a complex configuration, and fine bubbles can be generated stably while being easily attached to existing water pipes, shower heads, etc.

[0049] According to the fine bubble generator 100 of this embodiment, in the pressurized region 32, the inner diameter of the channel 3 decreases as it proceeds toward the tip side L1, and then increases again as it proceeds toward the tip side L1. Therefore, it is possible to pressurize and then depressurize the liquid that passes through the water passage hole 4 and moves while rotating in the circumferential direction C, and fine bubbles can be generated in the liquid passing through the channel 3.

[0050] According to the fine bubble generator 100 of this embodiment, the inner cylinder portion 2 is formed by including synthetic resin, so the inner cylinder portion 2 can be easily generated. The fine bubble generator 100 has a configuration that enables stable generation of fine bubbles, so there is no need to use highly rigid materials such as metal. Processing using synthetic resin is easier than processing using metal. Therefore, the fine bubble generator 100 can generate fine bubbles easily while also stably generating them.

[0051] In the fine bubble generator 100 according to this embodiment, the liquid passing through the water passage holes 4 of the inner cylinder 2 is configured to pass from the inside to the outside of the inner cylinder 2. Therefore, the liquid that has passed through the water passage holes 4 moves toward the tip side L1 while rotating in the circumferential direction C between the inner surface of the outer cylinder 1 and the outer surface 21s of the inner cylinder 2. At this time, since the space between the inner surface of the outer cylinder 1 and the outer surface 21s of the inner cylinder is formed in an annular shape, the liquid can rotate stably in the circumferential direction C, and fine bubbles are stably generated in the pressurized region 32. The space between the inner surface of the outer cylinder 1 and the outer surface 21s of the inner cylinder 2 is formed by arranging the inner cylinder 2 in the inner cylinder arrangement region 31, resulting in a simple configuration. In other words, fine bubbles can be stably generated without a complex configuration. Therefore, the fine bubble generator 100 can be easily attached to existing water pipes, shower heads, etc., while stably generating fine bubbles.

[0052] In the fine bubble generator 100 according to this embodiment, when the inner cylinder portion 2 is placed in the inner cylinder arrangement region 31, the shape of the internal space of the first tapered portion 32a is a frustoconical shape. Therefore, the liquid can move stably towards the tip side L1 while rotating in the circumferential direction C, and fine bubbles are stably generated in the second tapered portion 32c. In other words, fine bubbles can be stably generated without a complex configuration. Therefore, the fine bubble generator 100 can be easily attached to existing water pipes, shower heads, etc., while stably generating fine bubbles.

[0053] (modified version) Next, with reference to Figure 6, the modified inner cylinder portion 2B will be described.

[0054] Figure 6 is a side view showing the inner cylinder portion 2B according to a modified example. The inner cylinder portion 2B is a modified example of the inner cylinder portion 2. The inner cylinder portion 2B differs from the inner cylinder portion 2 in that it has a plurality of protrusions 23.

[0055] As shown in Figure 6, the inner cylinder portion 2B has an inner cylinder body portion 21, a flange portion 22, and a plurality of protrusions 23. The plurality of protrusions 23 are members that project radially R from the outer surface 21s of the side wall portion 21a. The plurality of protrusions 23 are formed at equal intervals in the longitudinal direction L and the circumferential direction C. The plurality of protrusions 23 are formed to be approximately equal in size. The plurality of protrusions 23 are formed to be approximately equal in shape. The plurality of protrusions 23 are formed to be approximately rotationally symmetrical when viewed with respect to the longitudinal direction L. The plurality of protrusions 23 are formed in three rows in the longitudinal direction L. The plurality of protrusions 23 are formed in eight rows in the circumferential direction C. In other words, 24 protrusions 23 are formed.

[0056] The multiple protrusions 23 are formed from a synthetic resin. For example, the multiple protrusions 23 are formed from polyvinyl chloride. The inner cylinder body 21 and the multiple protrusions 23 are formed integrally.

[0057] The inner cylinder portion 2B is used by being positioned in the inner cylinder arrangement region 31 of the outer cylinder portion 1, similar to the inner cylinder portion 2. The liquid that passes through the water passage holes 4 of the inner cylinder portion 2B collides with a plurality of protrusions 23 in the space between the inner surface of the outer cylinder portion 1 and the outer surface 21s of the inner cylinder portion 2B. Specifically, the liquid rotates in the circumferential direction C and moves toward the tip side L1, colliding with the plurality of protrusions 23. At this time, the gas contained in the liquid is sheared. As the total number of bubbles contained in the liquid before passing through the pressurized region 32 increases, the total number of fine bubbles contained in the liquid after passing through the pressurized region 32 increases. Therefore, by using the inner cylinder portion 2B, the total number of fine bubbles generated increases.

[0058] The configuration of the multiple protrusions 23 formed on the inner cylinder portion 2B is not limited. The multiple protrusions 23 may be formed, for example, in two rows in the longitudinal direction L. Also, the material of the protrusions 23 is not limited. The protrusions 23 may be formed, for example, including metal.

[0059] In the fine bubble generator 100, the multiple water passages 4 are formed in a rectangular shape when viewed from the radial direction R, but the shape of the multiple water passages 4 is not limited. The multiple water passages 4 only need to be shaped in a way that allows the liquid to flow stably through them. The multiple water passages 4 may be circular, for example.

[0060] In the fine bubble generator 100, eight water passage holes 4 are provided, but the number of water passage holes 4 is not limited. Multiple water passage holes 4 are acceptable as long as the configuration allows the liquid to flow stably through them. For example, six water passage holes 4 may be provided.

[0061] In the fine bubble generator 100, the channel 3 is formed in a circular shape when viewed from the longitudinal direction L in the pressurized region 32. In the pressurized region 32, the inner diameter of the channel 3 decreases as it proceeds toward the tip side L1, and then increases again as it proceeds toward the tip side L1. However, the shape of the channel 3 is not limited. The channel 3 only needs to have a shape that can stably generate fine bubbles.

[0062] The inner cylinder portion 2 is formed by including a synthetic resin, but the material of the inner cylinder portion 2 is not limited. The inner cylinder portion 2 should be made of a material that allows for the stable generation of fine bubbles. The inner cylinder portion 2 may be formed by including a metal, for example. Specifically, the inner cylinder portion 2 may be made by including stainless steel.

[0063] Although embodiments of the present invention have been described in detail above with reference to the drawings, the specific configuration is not limited to these embodiments, and design modifications and the like are also included within the scope of the gist of the present invention. Furthermore, the components shown in the above embodiments and modifications can be combined as appropriate. [Examples]

[0064] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to the following examples.

[0065] (experiment) We measured the fine bubbles generated when water was passed through a fine bubble generator. We also measured the particle size and number of fine bubbles contained in the water that passed through the fine bubble generator. Ten measurements were taken, and the average value was calculated.

[0066] The flow rate of water through the fine bubble generator was set to approximately 24.2 L / min. The dynamic pressure of the water flowing through the fine bubble generator was set to approximately 0.14 MPa. The static pressure of the water flowing through the fine bubble generator was set to approximately 0.93 MPa. The water temperature of the water flowing through the fine bubble generator was set to approximately 22 degrees Celsius. The water flowing through the fine bubble generator was ultrapure water. The water used for the measurement contained approximately 552,000 fine bubbles / mL. Therefore, the number of fine bubbles generated by the fine bubble generator was calculated by subtracting 552,000 from the number of fine bubbles contained in the water that passed through the fine bubble generator.

[0067] Examples 1, 2, Comparative Example 1, and Comparative Example 2 were described. Example 1 is a fine bubble generator 100 using an inner cylinder 2. Example 2 is a fine bubble generator 100 using an inner cylinder 2B. Comparative Example 1 is a fine bubble generator in which an inner cylinder with circular water passages is arranged in the inner cylinder arrangement region 31 of the outer cylinder 1. Comparative Example 2 is an existing fine bubble generator.

[0068] Figure 7 shows the measurement results of the particle size of fan bubbles generated by Example 1, Example 2, Comparative Example 1, and Comparative Example 2. Figure 8 shows the measurement results of the particle number of fan bubbles generated by Example 1, Example 2, Comparative Example 1, and Comparative Example 2.

[0069] As shown in Figure 7, the particle size of the bubbles contained in Example 1 and Example 2 was less than 100 μm, confirming the generation of fine bubbles. Furthermore, as shown in Figure 7, the particle size of the bubbles contained in Example 1 and Example 2 was less than 1 μm, confirming the generation of ultrafine bubbles. Ultrafine bubbles are fine bubbles with a particle size of less than 1 μm, and are bubbles that do not float to the surface of a liquid for several weeks to several months.

[0070] As shown in Figure 8, the number of fine bubbles generated by Example 1 is greater than the number of fine bubbles generated by Comparative Examples 1 and 2. In other words, fine bubbles can be stably generated by using the fine bubble generator 100.

[0071] Furthermore, as shown in Figure 8, the number of fine bubbles generated by Example 2 is greater than the number of fine bubbles generated by Comparative Examples 1 and 2. In particular, the sixth measurement shows that the number of particles measured is more than 3.75 times the average value of Comparative Example 1. In other words, a large number of fine bubbles can be generated by using the fine bubble generator 100 with the inner cylinder 2B. [Explanation of symbols]

[0072] 100 Fine Bubble Generators 1. Outer cylinder 2. Inner cylinder 2B Inner cylinder part 21 Inner cylinder body 21a Side wall part 21b Bottom wall 21s outer surface 21t inner surface 22 Flange section 23 Protrusion 3 channels 31 Inner cylinder arrangement area 32 Pressurized area 32a First tapered section 32b Reduced diameter part 32c Second tapered section 33 Flange locking part 4 Water passage holes D1 First angle D2 second angle D3 Third Angle V1 virtual line L Longitudinal direction L1 tip side L2 proximal side R radial direction C circumferential direction

Claims

1. A fine bubble generator capable of generating fine bubbles from gases dissolved in a liquid, An outer cylinder portion having a flow channel formed in the longitudinal direction from the base to the tip through which the liquid flows, It is formed in a cylindrical shape and has an inner cylindrical portion arranged in the flow path, Equipped with, The aforementioned flow path is It is formed in a cylindrical shape, and the inner cylinder arrangement region in which the inner cylinder portion is arranged, A pressurizing region located towards the tip from the inner cylinder arrangement region, which pressurizes the liquid, It has, The inner cylinder portion has a plurality of water passages in its side wall portion, which are inclined at a first angle with respect to the radial direction when viewed from the longitudinal direction, through which the liquid passes. The aforementioned first angle ranges from 1 degree to 85 degrees. Fine bubble generator.

2. The side wall portion has an outer surface and an inner surface that forms the water passage hole. The inner surface is inclined by a second angle with respect to the outer surface when viewed from the longitudinal direction. The aforementioned second angle ranges from 5 degrees to 89 degrees. The fine bubble generator according to claim 1.

3. The plurality of water passage holes are formed in a rectangular shape when viewed from the radial direction. A fine bubble generator according to claim 1 or claim 2.

4. There are eight of these water passage holes. A fine bubble generator according to claim 1 or claim 2.

5. The flow path is formed in a circular shape when viewed from the longitudinal direction in the pressurized region. In the pressurized region, the inner diameter of the flow path decreases as it moves toward the tip, and then increases again as it moves toward the tip. A fine bubble generator according to claim 1 or claim 2.

6. The inner cylinder portion is formed by including synthetic resin. A fine bubble generator according to claim 1 or claim 2.

7. The inner cylinder portion has a plurality of protrusions that project radially from the outer surface of the side wall portion. A fine bubble generator according to claim 1 or claim 2.

8. It is attached to the water pipe. A fine bubble generator according to claim 1 or claim 2.

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