JP2013252467A - Fine air bubble generation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fine air bubble generation device which can generate a sufficient amount of fine air bubbles while preventing the clogging of a foreign matter in the device.SOLUTION: A fine air bubble generation device 4 comprises an air introduction part 5 for taking in air into water, and a fine air bubble creation part 7 for making air fine. The fine air bubble creation part 7 comprises a first passage-forming part 10, a fine air bubble generation part 11 and a second passage-forming part 12. A first passage-forming part 10 forms a first swirl passage 14 in which water flows downstream while swirling. The first swirl passage 14 is formed so that a swirl turning diameter of the water flowing downstream gradually becomes small. The fine air bubble generation part 11 is arranged downstream of the first passage-forming part 10 and generates fine air bubbles in the water which has passed the first swirl passage 14. The second passage-forming part 12 forms a second swirl passage 19 in which the water flows downstream while rotating around the outside of the first passage-forming part 10.

Description

  The present invention relates to an apparatus for generating fine bubbles in water.

  The fine bubble generating device is a device for generating fine bubbles in a fluid (for example, underwater). As means for generating fine bubbles in water, for example, those using a venturi type, a cavitation type, a pressure dissolution type, and a swirling type are known.

  An apparatus equipped with a venturi-type generating means is provided with a constricted portion in the flow path. In the constricted portion, the flow rate of water increases, so that air is taken into the flow path from the outside. On the downstream side of the constricted portion, the diameter of the flow path becomes large. For this reason, the pressure rises at the portion where the flow path expands, and the bubbles in the flow path are made finer.

  In an apparatus equipped with a cavitation type generating means, a gas-liquid mixture is fed into a pump. Then, for example, by applying ultrasonic vibration, bubbles are generated using cavitation.

  In an apparatus equipped with a pressure-melting type generating means, a pump for pressurizing air or the like is connected to a pipe through which water flows through another pipe. And external air is pressurized with a pump and the pressurized air is dissolved in water. Although this apparatus is enlarged, there is an advantage that a large amount of air can be dissolved in water.

In an apparatus equipped with a swirling flow type generating means, a swirling water flow is formed in the flow path to shear and destroy the internal air, thereby generating fine bubbles. This method is superior to other methods in that fine bubbles can be generated even when the flow rate of water is small.
The following Patent Document 1 discloses an apparatus equipped with a swirling flow type generating means.

Japanese Patent No. 3127536

  In a device equipped with a swirl type generating means, the flow rate of water must be increased in order to generate air bubbles by shearing and breaking the air. If the flow path is narrowed to increase the flow rate, there is a problem that foreign matter accumulates in the apparatus. Further, when the diameter of the flow path is increased in order to prevent foreign matter from accumulating, there is a problem that a sufficient shear force cannot be secured and only a small amount of bubbles can be generated.

  The present invention has been made to solve the above-described problems, and its purpose is to generate fine bubbles that can generate a sufficient amount of fine bubbles while preventing foreign matter from clogging in the apparatus. Is to provide a device.

  The fine bubble generating apparatus according to the present invention includes an air introduction unit for taking air into water, and a fine bubble generation unit for refining the air taken into water by the air introduction unit. A first flow path forming portion that forms a first swirl flow path that flows downstream while water swirls, and water that is disposed downstream of the first flow path formation section and that has passed through the first swirl flow path A fine bubble generating unit that generates fine bubbles, and a second flow path forming unit that forms a second swirl flow path in which water flows downstream while swirling outside the first flow path forming unit. The flow path is formed so that the swirling diameter of the water flowing downstream is gradually reduced.

  With the fine bubble generating apparatus according to the present invention, a sufficient amount of fine bubbles can be generated while preventing foreign matters from being clogged in the apparatus.

It is a figure which shows the structure of the fine bubble generator in Embodiment 1 of this invention. It is sectional drawing which shows the principal part of the fine bubble generator in Embodiment 1 of this invention. It is a figure which shows the structure of the principal part of the fine bubble generator in Embodiment 2 of this invention. It is sectional drawing which shows the principal part of the fine bubble generator in Embodiment 2 of this invention.

  The present invention will be described in detail with reference to the accompanying drawings. In each drawing, the same or corresponding parts are denoted by the same reference numerals. The overlapping description is simplified or omitted as appropriate.

Embodiment 1 FIG.
1 is a diagram showing a configuration of a fine bubble generating apparatus according to Embodiment 1 of the present invention. FIG. 2 is a cross-sectional view showing a main part of the fine bubble generating apparatus according to Embodiment 1 of the present invention. FIG. 2 shows an AA arrow view of FIG.

  1 and 2, reference numeral 1 denotes a pump for forming a water flow. Reference numeral 2 denotes a pipe extending downstream from the pump 1. Reference numeral 3 denotes a pipe arranged on the upstream side of the pump 1. When the pump 1 is driven, a water flow is formed, and water (or other fluid) flows in the pipes 2 and 3 from the pipe 3 side toward the pipe 2 side.

  A fine bubble generator 4 is provided between the pipe 3 and the pump 1. The pump 1 may be configured as a part of the fine bubble generator 4. The fine bubble generating device 4 is a device for generating fine bubbles in water. If the pump 1 is driven and a water flow is formed, fine bubbles can be generated in the water flowing in the pipe 3. The fine bubbles generated by the fine bubble generator 4 are sent into the pipe 2 together with water.

  The fine bubble generating device 4 includes, for example, an air introduction unit 5, an inflow pipe 6, and a fine bubble generation unit 7. When a water flow is formed by the pump 1, the water passes through the fine bubble generating device 4 in the order of the air introduction unit 5, the inflow pipe 6, and the fine bubble generation unit 7.

  The air introduction part 5 is for taking in external air into the water passing through the inside. The air introduction part 5 includes a main body part 8 and an intake pipe 9. The main body 8 has a cylindrical shape in which the diameter of the central portion is the smallest and the diameter gradually increases as it approaches each end. One end (upstream end) of the main body 8 is connected to the pipe 3. One end of the intake pipe 9 is connected to the center of the main body 8.

  When a water flow is formed by the pump 1, the water in the pipe 3 flows into the main body portion 8 from one end side. As described above, the main body 8 has a constricted shape at the center. For this reason, when the water passing through the inside of the main body 8 passes through the central portion of the main body 8, the flow velocity increases. Since the flow rate of water rises at the center of the main body 8, the inside of the main body 8 becomes negative pressure, and air is taken into the main body 8 from the intake pipe 9. From the other end (downstream end) of the main body 8, water (mixture of water and air) in which air is appropriately mixed flows out.

  The inflow pipe 6 is a tube body for allowing water flowing out from the air introduction section 5 (water taken in by the air introduction section 5) to flow into the fine bubble generation section 7. The inflow pipe 6 is disposed downstream of the air introduction unit 5. One end portion (upstream end) of the inflow pipe 6 is connected to the other end portion of the main body portion 8. The other end (downstream end) of the inflow pipe 6 is connected to the fine bubble generating unit 7.

  The fine bubble generating unit 7 is for making the air taken into the water by the air introducing unit 5 fine. The fine bubble generation unit 7 is disposed downstream of the air introduction unit 5 and the inflow pipe 6. The fine bubble generating unit 7 includes, for example, a first flow channel forming unit 10, a fine bubble generating unit 11, a second flow channel forming unit 12, and a merging unit 13.

  The first flow path forming unit 10 forms the first swirl flow path 14. The first swirl flow path 14 is a flow path for allowing water to flow downstream while swirling. The 1st flow path formation part 10 forms the 1st swirl flow path 14 so that the swirl diameter of the water which flows downstream may become small gradually. The first flow path forming unit 10 has a conical space with a tip cut off. This space formed inside the first flow path forming unit 10 is the first swirl flow path 14.

  In order to form an appropriate swirling water flow (spiral water flow) inside the first flow path forming unit 10, the inflow pipe 6 is tangent to the inside of the first flow path forming unit 10 (first swirl flow path 14). The other end is connected to the first flow path forming unit 10 so as to flow in from the direction. That is, the water from the inflow pipe 6 flows into the first flow path forming unit 10 along the inner surface of the conical wall 15 that forms a conical space. The other end of the inflow pipe 6 is connected to the first flow path forming part 10 at a position close to the bottom wall 16 that forms the bottom of the conical space.

  The fine bubble generator 11 is for generating fine bubbles in the water that has passed through the first swirl flow path 14. The fine bubble generating unit 11 is disposed downstream of the first flow path forming unit 10. The fine bubble generating unit 11 has a continuous cylindrical shape as a whole.

The fine bubble generating unit 11 includes, for example, an upstream first main body portion 17 and a downstream second main body portion 18.
The first body portion 17 has a cylindrical shape in which the diameter of the central portion is the smallest and the diameter gradually increases as it approaches each end portion. One end of the first main body portion 17 (one end portion (upstream end) of the fine bubble generating portion 11) is connected to the downstream end of the first flow path forming portion 10. The 2nd main-body part 18 exhibits the cylinder shape of a uniform diameter which has predetermined | prescribed length. One end (upstream end) of the second main body 18 is connected to the other end (downstream end) of the first main body 17. The other end portion of the second main body portion 18 (the other end portion (downstream end) of the fine bubble generating portion 11) opens toward the downstream side.

  The second flow path forming unit 12 forms the second swirl flow path 19. The second swirl flow path 19 is a flow path for flowing water downstream while swirling the outside of the first swirl flow path 14 (first flow path forming portion 10). The 2nd flow path formation part 12 forms the 2nd swirl flow path 19 so that the swirl diameter of the water which flows downstream may become small gradually. The second flow path forming unit 12 has a conical space with a tip cut off. The first flow path forming part 10 is arranged inside the second flow path forming part 12 and is arranged so that the central axis thereof coincides with the central axis of the second flow path forming part 12. A space inside the second flow path forming part 12 formed around the first flow path forming part 10 is a second swirl flow path 19.

  In order to form an appropriate swirling water flow (spiral water flow) between the conical wall 15 of the first flow path forming unit 10 and the conical wall 20 of the second flow path forming unit 12, an opening 21 is formed in the conical wall 15. The The first swirl flow path 14 and the second swirl flow path 19 communicate with each other through the opening 21. In the present embodiment, a case where the first swirl flow path 14 and the second swirl flow path 19 communicate with each other only through the opening 21 is shown. The opening 21 is covered with a filter 22. For example, the filter 22 is configured by a mesh having many holes of φ2 mm or more so that pebbles and the like can pass through.

  The junction 13 joins the water that has passed through the first swirl flow path 14 (and the inside of the fine bubble generating section 11) and the water that has passed through the second swirl flow path 19. The merging portion 13 has a uniform cylindrical shape having a predetermined length. One end portion (upstream end) of the merging portion 13 is connected to the downstream end of the second flow path forming portion 12. Further, the second main body portion 18 of the fine bubble generating portion 11 is disposed inside the merging portion 13. The other end portion of the second main body portion 18 opens inside the merging portion 13. The central axis of the second main body 18 and the central axis of the merging portion 13 are arranged on the same straight line. The other end (downstream end) of the merging portion 13 is connected to the pump 1.

Next, the operation of the fine bubble generator 4 having the above configuration will be described.
When the pump 1 is driven, a water flow flowing from the pipe 3 side to the pipe 2 side is generated. Water in the pipe 3 flows into the air introduction unit 5. When water passes through the main body 8, air is taken into the water. The water in which the air is taken in by the air introduction part 5 passes through the inflow pipe 6 and flows into the first flow path forming part 10.

  The mixture of water and air flows into the first flow path forming unit 10 along the inner surface of the conical wall 15. As a result, a swirling water flow is formed inside the first flow path forming unit 10. The air that has flowed into the first flow path forming unit 10 together with the water gathers in the central part by forming a swirling water flow.

  The inside of the first flow path forming unit 10 has a conical shape whose diameter gradually decreases toward the downstream. For this reason, the swirling water flow formed inside the first flow path forming unit 10 is accelerated toward the downstream side, and the air collected in the center is attracted to the downstream side by the negative pressure.

  The water that has passed through the inside of the first flow path forming unit 10 (the first swirl flow path 14) maintains the swirling water flow even after flowing into the fine bubble generating unit 11. When the water passes through the constricted portion of the fine bubble generating unit 11, the pressure is released and the air expands. At this time, the expanded air comes into contact with the inner portion of the swirling water flow and is finely sheared to generate fine bubbles. The generated fine bubbles pass through the second main body portion 18 together with water and flow into the merging portion 13.

  On the other hand, part of the water that has flowed into the first flow path forming portion 10 passes through the opening 21 and is a space formed between the first flow path forming portion 10 and the second flow path forming portion 12. It flows into (second swirl flow path 19). In the configuration in the present embodiment, the water in which the air is taken in by the air introduction part 5 flows into the second swirl flow path 19 only from the opening 21.

  In addition, dust (for example, large foreign matter such as fiber dust or hair) that has flowed into the first flow path forming unit 10 together with water is swirled by the swirling water flow generated inside the first flow path forming unit 10 to form a cone. While being pressed against the inner surface of the wall 15, it proceeds downstream. Then, the foreign matter passes through the opening 21 (filter 22) and flows into the second swirl passage 19.

  The water that flows into the second swirl channel 19 (including foreign matter) flows into the second swirl channel 19 along the inner surface of the conical wall 20. Accordingly, a swirling water flow is also formed outside the first flow path forming unit 10 (second swirl flow path 19). The water flowing through the second swirl passage 19 has a swirl diameter that decreases toward the downstream and is accelerated. For this reason, the water flowing through the second swirl flow path 19 passes through the second swirl flow path 19 while maintaining the swirl flow, and flows into the merging portion 13. That is, the water that has passed through the second swirl flow path 19 joins with the water that has passed through the first swirl flow path 14 downstream of the fine bubble generating unit 11.

  If it is the fine bubble generator 4 which has the said structure, the foreign material in water will not clog the fine bubble generation part 11, and the production amount of a fine bubble can be maintained over a long period of time.

  In the first flow path forming unit 10, it is necessary to increase the speed of the swirling water flow generated inside by gradually reducing the swirling diameter while reducing the pressure loss. For this reason, the inner surface of the conical wall 15 is formed with a high-density and smooth curved surface.

  In the fine bubble generating unit 11, the water flow having a reduced turning diameter is opened in the pipe (first main body unit 17). Since the swirling water flow spreads along the inner surface of the first main body portion 17, the water flow is not disturbed. For this reason, the amount of air sheared inside the first main body portion 17 can be increased, and many fine bubbles can be generated.

  Further, in the fine bubble generating device 4, foreign matters such as fiber dust and hair are pushed out to the second swirl channel 19 through the opening 21 and pass through the first swirl channel 14 downstream of the fine bubble generator 11. Merge with the water. Since the second swirl flow path 19 is completely separated from the first swirl flow path 14, it is possible to greatly reduce the foreign matter that enters the fine bubble generating unit 11. It is possible to prevent the foreign matter from clogging the fine bubble generating part 11 (particularly, the central part of the first main body part 17), and it is possible to prevent the generation amount of the fine bubbles from being lowered for a long time.

  In order to allow more foreign matter to flow into the second swirl flow path 19, it is necessary to provide an opening 21 at a location where a stable swirl water flow is formed. The opening 21 has a conical wall 15 so that the water flowing into the first flow path forming part 10 from the inflow pipe 6 reaches the opening 21 after turning 180 degrees or more inside the first flow path forming part 10. It is preferable to be formed. Further, in order to prevent the foreign matter from being clogged in the second swirl flow path 19, the gap between the conical wall 15 of the first flow path forming part 10 and the conical wall 20 of the second flow path forming part 12 is an interval of 5 mm or more. Is preferably formed.

  A filter (not shown) for capturing foreign matter that has entered the second swirl flow path 19 may be provided in the second flow path forming portion 12. A filter is arrange | positioned so that it may orthogonally cross with respect to the water flow direction of the 2nd turning flow path 19, for example. In such a case, the second flow path forming unit 12 may not have a shape that reduces the diameter. It is preferable to form a sufficient space for depositing foreign matter between the conical wall 15 of the first flow path forming unit 10 and the conical wall 20 of the second flow path forming unit 12.

  When arranging a filter in the 2nd swirl flow path 19, the 2nd flow path formation part 12 is provided with respect to the 1st flow path formation part 10 so that attachment or detachment is possible, for example. With this configuration, the second swirl flow path 19 can be cleaned by removing the second flow path forming part 12 from the first flow path forming part 10, and the foreign matter accumulated on the filter is periodically removed. be able to.

  Inside the merge section 13, the water that has passed through the first swirl flow path 14 and the water that has passed through the second swirl flow path 19 can be merged in a state of swirling in the same direction. For this reason, the disturbance of the water flow at the time of joining can be suppressed, and a foreign material can be smoothly flowed downstream.

  Air flows into the pump 1 together with water. For this reason, the pump 1 needs to operate normally even when air flows in. As the pump 1, for example, an overflow pump that can carry both air and water is suitable. Furthermore, it is desirable to provide the pump 1 with a foreign matter trapping mechanism so that the foreign matter is not entangled with the rotor blades.

  In the present embodiment, the self-priming air introduction unit 5 has been described. However, if the pressure loss on the downstream side of the air introduction part 5 is high, it is difficult to form a negative pressure in the main body part 8, and intake may not be performed. For this reason, the structure which supplies air with an air supply pump may be sufficient as the air introduction part 5. FIG. In such a case, it is preferable to provide a back valve between the air feed pump and the air introduction unit 5 in order to prevent water from flowing into the air introduction unit 5.

  Moreover, in this Embodiment, the case where water passes the inside of the fine bubble generator 4 in order of the air introduction part 5, the inflow pipe 6, and the fine bubble production | generation part 7 was demonstrated. However, this is an example. Since the air introduction part 5 should just be provided with the constriction part in which a negative pressure is formed, you may form the air introduction part 5 in the fine bubble generation | occurrence | production part 11, for example. That is, it is not necessary to limit the air introduction part 5 to the upstream position of the fine bubble generator 4.

Embodiment 2. FIG.
FIG. 3 is a diagram showing a configuration of a main part of the fine bubble generating apparatus according to Embodiment 2 of the present invention. FIG. 4 is a cross-sectional view showing a main part of the fine bubble generating apparatus according to Embodiment 2 of the present invention. FIG. 4 shows a view taken along the line BB in FIG.

  The fine bubble generating device 4 in the present embodiment includes, for example, an air introduction unit 5, an inflow pipe 6, and a fine bubble generation unit 7. When a water flow is formed by the pump 1, the water passes through the fine bubble generating device 4 in the order of the air introduction unit 5, the inflow pipe 6, and the fine bubble generation unit 7. The fine bubble generating unit 7 includes, for example, a first flow channel forming unit 10, a fine bubble generating unit 11, a second flow channel forming unit 12, and a merging unit 13.

  The first flow path forming unit 10 forms the first swirl flow path 14. The first swirl flow path 14 is a flow path for allowing water to flow downstream while swirling. The 1st flow path formation part 10 forms the 1st swirl flow path 14 so that the swirl diameter of the water which flows downstream may become small gradually. The first flow path forming unit 10 includes, for example, a fixed wing 23, a cylindrical wall 24, and a conical wall 25.

  The fixed wing 23 is for swirling the water flowing from the inflow pipe 6 to form a swirling water flow. The fixed wing 23 is provided at the inlet of the first swirl flow path 14. The fixed wing 23 has a propeller shape including, for example, three or more blades. The fixed wing 23 is formed with a hole having a diameter of φ2 mm or more in the center thereof. This hole is provided to prevent the fixed wing 23 from being clogged with fine dust.

  The cylindrical wall 24 has a cylindrical shape. The cylindrical wall 24 is arranged such that the central axis coincides with the direction of water flow from the inflow pipe 6. A fixed wing 23 is provided at one end (upstream end) of the cylindrical wall 24. For this reason, the water flow swirled by the fixed wing 23 flows into the cylindrical wall 24.

  One end (upstream end) of the conical wall 25 is connected to the other end (downstream end) of the cylindrical wall 24. The conical wall 25 is disposed so that the central axis is aligned with the central axis of the cylindrical wall 24. The conical wall 25 is provided so as to extend downstream from the other end portion of the cylindrical wall 24 so that the diameter decreases toward the other end portion. The other end (downstream end) of the conical wall 25 opens toward the downstream side.

  The fine bubble generating unit 11 has a cylindrical shape having the same diameter as the cylindrical wall 24. One end (upstream end) of the microbubble generator 11 is connected to the other end of the cylindrical wall 24. The fine bubble generating unit 11 is arranged so that the central axis is aligned with the central axis of the cylindrical wall 24. The fine bubble generating unit 11 is arranged so as to cover the periphery of the conical wall 25, and the other end (downstream end) opens toward the downstream side downstream of the other end of the conical wall 25.

  The second flow path forming unit 12 forms the second swirl flow path 19. The second swirl flow path 19 is a flow path for flowing water downstream while swirling the outside of the first swirl flow path 14 (first flow path forming portion 10). The second flow path forming unit 12 includes, for example, a fixed wing 26 and a cylindrical wall 27.

  The fixed wing 26 is for swirling water flowing from the inflow pipe 6 to form a swirling water flow. The fixed wing 26 is provided at the inlet of the second swirl passage 19. The fixed wing 26 is disposed on the upstream side of the fixed wing 23. The fixed wing 26 has, for example, three or more blades, and a hole having the same diameter as the cylindrical wall 24 is formed at the center thereof.

  The cylindrical wall 27 has a cylindrical shape with a diameter larger than that of the cylindrical wall 24. The cylindrical wall 27 is arranged so that the central axis coincides with the central axis of the cylindrical wall 24. For this reason, the inlet of the second swirl passage 19 is formed in an annular shape around the cylindrical wall 24.

  A fixed wing 26 is provided at one end (upstream end) of the cylindrical wall 27. For example, the fixed wings 26 are arranged such that a plurality of blades protrudes inward from the inner surface of the cylindrical wall 27. The water flow swirled by the fixed blades 26 flows into the space formed between the cylindrical wall 27 and the cylindrical wall 24 (that is, the second swirl flow path 19). The cylindrical wall 27 is disposed so as to cover the periphery of the first flow path forming unit 10 and the fine bubble generating unit 11.

  The merge portion 13 has a cylindrical shape with the same diameter as the cylindrical wall 27. The merge portion 13 is arranged such that the central axis is aligned with the central axis of the cylindrical wall 27. One end (upstream end) of the merging portion 13 is connected to the other end (downstream end) of the cylindrical wall 27. The other end (downstream end) of the merging portion 13 is connected to the pump 1.

Next, the operation of the fine bubble generator 4 having the above configuration will be described.
When the pump 1 is driven, a water flow flowing from the pipe 3 side to the pipe 2 side is generated. Water in the pipe 3 flows into the air introduction unit 5. When water passes through the main body 8, air is taken into the water. The water in which the air is taken in by the air introduction unit 5 passes through the inflow pipe 6 and flows into the fine bubble generation unit 7.

  The mixture of water and air that has flowed into the fine bubble generating unit 7 is swirled in a predetermined direction by the fixed blades 26. As a result, dust (for example, large foreign matter such as fiber dust or hair) that has flowed into the fine bubble generating unit 7 together with water is swung by the swirling water flow that is generated and pressed against the inner surface of the cylindrical wall 27, downstream move on. The foreign matter flows between the cylindrical wall 27 and the cylindrical wall 24, that is, into the second swirl passage 19.

  On the other hand, the mixture of water and air flowing through the central portion of the cylindrical wall 27 is swirled in a predetermined direction (the same direction as the direction in which water swirls in the second swirl passage 19) by the fixed blade 23. The swirling water flow generated by the fixed wing 23 passes through the inside of the cylindrical wall 24 and flows into the inside of the conical wall 25. Thereby, the swirling water flow generated by the fixed wing 23 is accelerated toward the downstream inside the conical wall 25, and the air collected at the center is attracted to the downstream side by the negative pressure.

  The air in the swirling water flow expands when the pressure is released at the downstream end of the conical wall 25. At this time, the expanded air comes into contact with the inner portion of the swirling water flow and is finely sheared to generate fine bubbles. The generated fine bubbles pass through the fine bubble generating unit 11 together with water and flow into the merging unit 13. Thereby, the water that has passed through the first swirl flow path 14 and the water that has passed through the second swirl flow path 19 merge downstream of the fine bubble generating unit 11.

  If it is the fine bubble generator 4 which has the said structure, the foreign material in water will not clog the fine bubble generation part 11, and the production amount of a fine bubble can be maintained over a long period of time.

  In the first flow path forming unit 10, it is necessary to increase the speed of the swirling water flow generated inside by gradually reducing the swirling diameter while reducing the pressure loss. For this reason, the inner surface of the cylindrical wall 24 and the inner surface of the conical wall 25 are formed with high-density and smooth curved surfaces.

  In the fine bubble generating unit 11, a water flow having a smaller turning diameter at the downstream end of the conical wall 25 is opened in the pipe (the fine bubble generating unit 11). Since the swirling water flow spreads along the inner surface of the fine bubble generating unit 11, the water flow is not disturbed. For this reason, the quantity of the air sheared inside the fine bubble generation part 11 can be increased, and many fine bubbles can be produced | generated.

  Further, in the fine bubble generating device 4, foreign matters such as fiber dust and hair are pushed outward by the swirling water flow generated by the fixed wings 26 and flow into the second swirling flow path 19. And the water containing the foreign material that has passed through the second swirl flow path 19 joins with the water that has passed through the first swirl flow path 14 downstream of the fine bubble generating unit 11. Since the second swirl flow path 19 is completely separated from the first swirl flow path 14, foreign substances that enter the first swirl flow path 14 can be greatly reduced. It is possible to prevent the foreign matter from clogging the fine bubble generating unit 11 (or the downstream end of the first flow path forming unit 10), and it is possible to prevent the generation amount of the fine bubbles from decreasing for a long period of time.

  In order to prevent foreign substances from being clogged in the second swirl flow path 19, it is preferable that an interval of 5 mm or more is formed between the cylindrical wall 24 and the fine bubble generating unit 11 and the cylindrical wall 27.

  A filter (not shown) for capturing foreign matter that has entered the second swirl flow path 19 may be provided in the second flow path forming portion 12. A filter is arrange | positioned so that it may orthogonally cross with respect to the water flow direction of the 2nd turning flow path 19, for example. In such a case, it is preferable to form a sufficient space for depositing foreign matter between the cylindrical wall 24 and the fine bubble generating unit 11 and the cylindrical wall 27.

  When a filter is disposed in the second swirl flow path 19, for example, the cylindrical wall 24 is detachably provided to the first flow path forming unit 10. With this configuration, by removing the cylindrical wall 24 from the first flow path forming unit 10, the second swirl flow path 19 can be cleaned, and foreign matters accumulated on the filter can be removed periodically.

  Inside the merge section 13, the water that has passed through the first swirl flow path 14 and the water that has passed through the second swirl flow path 19 can be merged in a state of swirling in the same direction. For this reason, the disturbance of the water flow at the time of joining can be suppressed, and a foreign material can be smoothly flowed downstream.

  The configuration that is not disclosed in the present embodiment is the same as the configuration disclosed in the first embodiment.

DESCRIPTION OF SYMBOLS 1 Pump 2, 3 Piping 4 Fine bubble generator 5 Air introduction part 6 Inflow pipe 7 Fine bubble production | generation part 8 Main body part 9 Intake pipe 10 1st flow path formation part 11 Fine bubble generation part 12 2nd flow path formation part 13 Merge Part 14 First swirl flow path 15, 20, 25 Conical wall 16 Bottom wall 17 First main body 18 Second main body 19 Second swirl flow path 21 Opening 22 Filter 23, 26 Fixed blade 24, 27 Cylindrical wall

Claims (8)

An air inlet for taking air into the water;
A fine bubble generating part for refining the air taken into the water by the air introducing part;
With
The fine bubble generator is
A first flow path forming unit that forms a first swirl flow path in which water flows downstream while swirling;
A fine bubble generating section that is arranged downstream of the first flow path forming section and generates fine bubbles in water that has passed through the first swirl flow path;
A second flow path forming portion that forms a second swirl flow path in which water flows downstream while swirling outside the first flow path forming section;
With
The first swirl flow path is a fine bubble generating device formed so that the swirl diameter of water flowing downstream is gradually reduced. An inflow pipe for allowing water to flow into the first swirl flow path;
With
The first flow path forming portion is formed with a space having a conical shape with a tip cut off,
2. The fine bubble generating device according to claim 1, wherein the inflow pipe is connected to the first flow path forming section so that water flows into the first flow path forming section from a tangential direction. The first flow path forming part has an opening formed in a conical wall forming the first swirl flow path,
The fine bubble generating device according to claim 2, wherein the second swirl flow path communicates with the first swirl flow path through the opening.   The fine bubble generating device according to claim 3, wherein water flows into the second swirl passage only from the opening. The first flow path forming portion includes a first fixed blade provided at an inlet of the first swirl flow path,
The second flow path forming unit includes a second fixed wing provided at an inlet of the second swirl flow path,
2. The fine bubble generating device according to claim 1, wherein an inlet of the second swirl channel is formed in an annular shape around the first channel forming part.   6. The microbubble generation according to claim 1, wherein the water that has passed through the second swirl flow path merges with the water that has passed through the first swirl flow path downstream of the fine bubble generation section. apparatus.   The microbubble generator according to any one of claims 1 to 6, wherein the second flow path forming unit includes a filter for capturing dust flowing through the second swirl flow path.   The fine bubble generating device according to claim 7, wherein the second flow path forming portion is provided detachably with respect to the first flow path forming portion.

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