Air mixing nozzle

Abstract

To provide an air mixing nozzle capable of realizing finer air bubbles in a liquid flow by utilizing a swirling flow more efficiently than ever before. [Solution] The gas mixing nozzle 12 comprises a first cylindrical body 42 that forms a first cylindrical liquid passage 41 of minimum diameter Da that opens at the outlet end, a second cylindrical body 44 that is connected to the outlet end of the first cylindrical body 42 and forms a second cylindrical liquid passage 43 of a second diameter Db that is larger than the minimum diameter Da and is coaxially connected to the first cylindrical liquid passage 41, a groove that is formed on the end face of the second cylindrical body 44 and extends in the centrifugal direction while inclining circumferentially from the diameter in a specific direction, and that opens into the second cylindrical liquid passage 43, and an outer cylinder 76 that surrounds the first cylindrical body 42 and the second cylindrical body 44 and defines a gas chamber 77 that is connected to the groove on the outer surface of the second cylindrical body 44.

Description

[Technical Field]

[0001] The present invention relates to an air-mixing nozzle. [Background technology]

[0002] Patent Document 1 discloses a first diameter Ryusuidori and a second diameter larger than the first diameter. Surrounded by a deformed cylindrical surface No. 2 Ryusuidori The second nozzle separates the two passages. Ryusuidori A passage opens in the channel, which injects air from an air chamber at atmospheric pressure into the water flow as the channel expands from the first diameter to the second diameter. The passage extends centrifugal from the diameter of the channel, tilting in a specific direction circumferentially. Therefore, when the air is injected, it swirls in the opposite direction to the specific direction. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 4756368 Summary of the Invention [Problem to be solved by the invention]

[0004] No. 2 Ryusuidori The inner wall surface of the passage is formed with longitudinal grooves extending in the axial direction. The air passage is formed in the longitudinal grooves. Ryusuidori It was thought that the corners at the end of the longitudinal grooves contributed greatly to the miniaturization of air bubbles caught in the water flow, compared to the swirling of air.

[0005] An object of the present invention is to provide an air mixing nozzle that can utilize a swirling flow more efficiently than ever before to achieve atomization of air bubbles in a liquid flow. [Means for solving the problem]

[0006] According to one aspect of the present invention, there is provided an air-mixing nozzle comprising: a first cylindrical body forming a first cylindrical liquid passage of a minimum diameter that opens at an outlet end; a second cylindrical body connected to the outlet end of the first cylindrical body and forming a second cylindrical liquid passage of a second diameter larger than the minimum diameter that is coaxially connected to the first cylindrical liquid passage; a groove formed on an end surface of the second cylindrical body, extending in a centrifugal direction while inclining circumferentially from the diameter in a specific direction, and opening into the second cylindrical liquid passage; and an outer cylinder surrounding the first cylindrical body and the second cylindrical body and defining a gas chamber that is connected to the groove on the outer surface of the second cylindrical body. [Effects of the Invention]

[0007] As described above, the disclosed concept provides an air mixing nozzle that can utilize a swirling flow more efficiently than ever before to achieve atomization of air bubbles in a liquid flow. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a conceptual diagram showing the outline of the configuration of an aeration device 11 according to an embodiment of the present invention. [Figure 2] 2 is a conceptual diagram of a liquid pump as seen from the arrow 2 in FIG. 1. [Figure 3] FIG. 2 is an enlarged cross-sectional view schematically showing the structure of an air mixing nozzle. [Figure 4] FIG. 2 is a diagram showing a passage defined between a first cylindrical body and a second cylindrical body. [Figure 5] FIG. 10 is a diagram showing a passage defined between the second cylindrical body and the third cylindrical body. [Figure 6] FIG. 10 is a diagram showing a passage defined between the third cylinder and the injection cylinder. [Figure 7] FIG. 10 is an enlarged cross-sectional view showing a passage according to another embodiment. [Figure 8] FIG. 10 is a conceptual diagram showing a flow straightening shape arranged in a slit. [Figure 9] FIG. 8 is a conceptual diagram corresponding to FIG. 7 and showing a modified example of the passage. [Figure 10] 1. FIG. 5 is a conceptual diagram illustrating a rotation mechanism according to another embodiment, corresponding to FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

[0010] Figure 1 shows a schematic diagram of an aeration device 11 according to an embodiment of the present invention. The aeration device 11 comprises an air mixing nozzle 12 that mixes gas into liquid and sprays the liquid, a liquid pump 13 that is connected to the air mixing nozzle 12 and supplies liquid to the air mixing nozzle 12, and a supply pipe 14 that supplies gas to the air mixing nozzle 12. The liquid pump 13 is disposed within a strainer 15. The injection port 12a of the air mixing nozzle 12 opens in the external space of the strainer 15. The strainer 15 is submerged in water, for example. The upper end of the supply pipe 14 is disposed in the atmosphere.

[0011] The liquid pump 13 sucks the surrounding liquid through a suction port 16 in a strainer 15. The strainer 15 removes solid matter from the liquid. The sucked liquid is discharged under a predetermined pressure through a discharge pipe 17. The discharge pipe 17 is arranged horizontally.

[0012] The discharge pipe 17 of the liquid pump 13 and the inlet end of the gas mixing nozzle 12 are connected by piping 18. The piping 18 is coupled to the inlet end of the gas mixing nozzle 12 and is equipped with an inlet pipe 22 that forms a flow path 21 coaxial with the central axis 19 of the gas mixing nozzle 12. The flow path 21 in the inlet pipe 22 continues to the liquid path in the gas mixing nozzle 12 and forms a linear region a determined length Ls from the liquid path in the gas mixing nozzle 12. The axis 23 of the inlet pipe 22 is arranged horizontally. The inlet end of the inlet pipe 22 is connected to a relay pipe 25 by an elbow joint 24. The relay pipe 25 has an axis 26 that is perpendicular to the axis 23 of the inlet pipe 22. The relay pipe 25 stands upright. The inlet end of the relay pipe 25 is connected to the discharge pipe 17 of the liquid pump 13 by an elbow joint 27.

[0013] Here, liquid pump 13 includes impeller 29 rotatably supported about rotation axis 28, and electric motor 31 that drives impeller 29 about rotation axis 28 in response to the supply of current. Impeller 29 sucks liquid from suction port 16 located on rotation axis 28 and moves the liquid in a centrifugal direction. As shown in Figure 2, the liquid is guided to discharge pipe 17 by following the inner wall of volute casing 32.

[0014] 3, the gas mixture nozzle 12 includes a first cylindrical body 42 that forms a first cylindrical liquid passage 41 having a first diameter Da and that opens at the outlet end; a second cylindrical body 44 that is connected to the outlet end of the first cylindrical body 42 and that forms a second cylindrical liquid passage 43 having a second diameter Db that continues from the first cylindrical liquid passage 41; a third cylindrical body 46 that is connected to the outlet end of the second cylindrical body 44 and that forms a third cylindrical liquid passage 45 having a third diameter Dc that continues from the second cylindrical liquid passage 43; and an injection cylindrical body 48 that is connected to the outlet end of the third cylindrical body 46 and that forms a fourth cylindrical liquid passage 47 having a fourth diameter Dd that continues from the third cylindrical liquid passage 45. The inlet end of the first cylindrical body 42 is connected to the introduction pipe 22. The first cylindrical liquid passage 41, the second cylindrical liquid passage 43, the third cylindrical liquid passage 45 and the fourth cylindrical liquid passage 47 guide the flow of the liquid from the inlet pipe 22 to the injection port 12a.

[0015] The first diameter Da of the first cylindrical liquid path 42 is set to the smallest diameter. The second cylindrical liquid path 43 is coaxially connected to the first cylindrical liquid path 41. The second diameter Db is set to be larger than the first diameter Da. The second diameter Db is determined based on the flow rate of the liquid (e.g., water) flowing out of the first cylindrical body 42. The second diameter Db has a size that generates negative pressure along the cylindrical surface as the diameter expands.

[0016] The third cylindrical liquid path 45 is coaxially connected to the second cylindrical liquid path 43. The third diameter Dc is set to be larger than the second diameter Db. The third diameter Dc is determined based on the flow rate of the liquid (e.g., water) flowing out of the second cylindrical body 44. The third diameter Dc has a size that generates negative pressure along the cylindrical surface as the diameter expands.

[0017] The fourth cylindrical liquid passage 47 is coaxially connected to the third cylindrical liquid passage 45. The fourth diameter Dd is set to be larger than the third diameter Dc. The fourth diameter Dd is determined based on the flow rate of the liquid (e.g., water) flowing out of the third cylindrical body 46. The fourth diameter Dd has a size that generates negative pressure along the cylindrical surface as the diameter expands.

[0018] The second cylindrical body 44 is in liquid-tight contact with the outlet end of the first cylindrical body 42 at the first mating surface 51. A cylindrical body 52 is fixed to the outlet end of the first cylindrical body 42, surrounding the first mating surface 51 coaxially with the first cylindrical liquid passage 41. The cylindrical body 52 may be formed integrally with the first cylindrical body 42. An inserting tube 53 that is inserted into the cylindrical body 52 is formed at the inflow end of the second cylindrical body 44. An annular step 54 is formed in the inserting tube 53, surrounding the first mating surface 51. The step 54 forms a small-diameter tube 55 whose outer diameter is smaller than the inner surface of the cylindrical body 52. ​​An annular chamber 56 is defined between the cylindrical body 52 and the small-diameter tube 55. A groove 57 that opens into the second cylindrical liquid passage 43 is formed in the end face of the second cylindrical body 44. 4, the groove 57 extends linearly in the centrifugal direction from the diameter Dm while being inclined in the circumferential direction toward a specific direction DR at an inclination angle θ. The groove 57 opens into the annular chamber 56. The groove 57 forms a passage between the first cylindrical body 42 and the second cylindrical body 44, connecting the annular chamber 56 to the second cylindrical liquid passage 43.

[0019] The third cylindrical body 46 is in liquid-tight contact with the outflow end of the second cylindrical body 44 at the second mating surface 59. A cylindrical body 61 is fixed to the outflow end of the second cylindrical body 44, surrounding the second mating surface 59 coaxially with the second cylindrical liquid passage 43. The cylindrical body 61 may be formed integrally with the second cylindrical body 44. An inserting tube 62 that is inserted into the cylindrical body 61 is formed at the inflow end of the third cylindrical body 46. An annular step 63 is formed in the inserting tube 62, surrounding the second mating surface 59. The step 63 forms a small-diameter tube 64 whose outer diameter is smaller than the inner surface of the cylindrical body 61. An annular chamber 65 is defined between the cylindrical body 61 and the small-diameter tube 64. A groove 66 that opens into the third cylindrical liquid passage 45 is formed in the end face of the third cylindrical body 46. 5, the groove 66 extends linearly in the centrifugal direction from the diameter Dm while being inclined in the circumferential direction toward a specific direction DR at an inclination angle θ. The groove 66 opens into the annular chamber 65. The groove 66 forms a passage between the second cylindrical body 44 and the third cylindrical body 46, connecting the annular chamber 65 to the third cylindrical liquid passage 45.

[0020] The injection cylinder 48 is in liquid-tight contact with the outlet end of the third cylinder 46 at the third mating surface 68. A cylindrical body 69 is fixed to the outlet end of the third cylinder 46, surrounding the third mating surface 68 and coaxially with the third cylindrical liquid passage 45. The cylindrical body 69 may be formed integrally with the third cylinder 46. An inserting cylinder 71 is formed at the inlet end of the injection cylinder 48, which is inserted into the cylindrical body 69. An annular step 72 is formed in the inserting cylinder 71, surrounding the third mating surface 68. The step 72 forms a small-diameter cylinder 73, the outer diameter of which is smaller than the inner surface of the cylindrical body 69. An annular chamber 74 is defined between the cylindrical body 69 and the small-diameter cylinder 73. A groove 75, which opens into the fourth cylindrical liquid passage 47, is formed in the end face of the injection cylinder 48. 6, the groove 75 extends linearly in the centrifugal direction from the diameter Dm while being inclined in the circumferential direction in a specific direction DR at an inclination angle θ. The groove 75 opens into the annular chamber 74. The groove 75 forms a passage connecting the annular chamber 74 to the fourth cylindrical liquid passage 47 between the third cylinder 46 and the injection cylinder 48.

[0021] The gas mixture nozzle 12 includes an outer cylinder 76 that surrounds the first cylinder 42, the second cylinder 44, the third cylinder 46, and the injection cylinder 48. A gas chamber 77 is defined between the outer surfaces of the first cylinder 42, the second cylinder 44, the third cylinder 46, and the injection cylinder 48 and the outer cylinder 76. Through holes 78a, 78b, and 78c extending centrifugal from the annular chambers 56, 65, and 74 are formed in each of the cylinders 52, 61, and 69. The through holes 78a, 78b, and 78c connect the gas chamber 77 to the annular chambers 56, 65, and 74 of each of the cylinders 52, 61, and 69. The annular chambers 56, 65, and 74 and the through holes 78a, 78b, and 78c connect the gas chamber 77 to the respective grooves 57, 66, and 75.

[0022] The first cylindrical body 42 is fixed to the outer cylinder 76 so as not to be displaceable in the axial direction. Fixing devices 79 such as bolts are used for fixing. The bolts are screwed radially from the outer surface of the outer cylinder 76 and exert a fastening force that presses the first cylindrical body 42 against the inner surface of the outer cylinder 76. A sealing member may be sandwiched between the first cylindrical body 42 and the outer cylinder 76. Welding may be used for the fixing devices 79 instead of bolts.

[0023] The injection cylinder 48 is threaded axially into the outer cylinder 76. The injection cylinder 48 exerts a fastening force that presses the second cylinder 44 and the third cylinder 46 toward the fixed first cylinder 42. As a result of the fastening force, the end face of the second cylinder 44 is tightly fitted to the first cylinder 42 at the first mating surface 51. Similarly, the end face of the third cylinder 46 is tightly fitted to the second cylinder 44 at the second mating surface 59. Similarly, the end face of the injection cylinder 48 is tightly fitted to the third cylinder 46 at the third mating surface 68. An annular groove 82 is formed on the outer surface of the injection cylinder 48 in the axial direction, separating the end of the male thread groove 81. The male thread groove 81 of the injection cylinder 48 securely enters the female threaded hole of the outer cylinder 76 until the first cylinder 42, the second cylinder 44, the third cylinder 46, and the injection cylinder 48 are tightly fitted to each other.

[0024] Two chamfers 83 are formed on the outer surface of the injection cylinder 48 parallel to the central axis 19. When a tool is engaged with the parallel surfaces of the chamfer 83, the injection cylinder 48 is screwed into the outer cylinder 76 by the action of the tool. A strong fastening force is achieved from the injection cylinder 48. Two chamfers 84 are formed on the outer surface of the first cylinder 42 parallel to the central axis 19. When a tool is engaged with the parallel surfaces of the chamfer 84, the first cylinder 42 is screwed into the inlet pipe 22 by the action of the tool. Because the two chamfers 84 are positioned outside the outer cylinder 76 in the axial direction, relative rotation between the first cylinder 42 and the outer cylinder 76 is prevented when screwing. A male thread groove 85 is formed on the outer surface of the first cylinder 42 between the outlet end and the two chamfers 84.

[0025] Next, the operation of the aeration device 11 will be explained. The aeration device 11 is installed underwater, such as in a pond or a water tank. The upper end of the supply pipe 14 protrudes above the water surface and is open to the atmosphere. When the liquid pump 13 is activated, water is supplied from the piping 18 to the aeration nozzle 12. The water flows successively through the first cylindrical liquid path 41, the second cylindrical liquid path 43, the third cylindrical liquid path 45, and the fourth cylindrical liquid path 47. The water is sprayed into the water from the nozzle 12a of the spray cylinder 48.

[0026] As water flows successively through the first cylindrical liquid path 41 and the second cylindrical liquid path 43, negative pressure is generated along the cylindrical surface at the inlet end of the second cylindrical liquid path 43 as the diameter of the second cylindrical liquid path 43 expands. The generated negative pressure draws air into the second cylindrical liquid path 43 through the grooves 57. The air is ejected into the water flow. The water flow shears the air, resulting in finer air bubbles (microbubbles) mixed into the water flow. The grooves 57 on the end surface extend centrifugal from a diameter Dm, tilting circumferentially toward a specific direction DR. Therefore, when the air is mixed into the water flow, it swirls in the direction RV opposite the specific direction DR. The cylindrical surface of the second cylindrical liquid path 43 effectively guides the swirling of the air. Because the water flow velocity is fastest in the first cylindrical liquid path 41, which has the smallest diameter, the swirling effect is maximized. This results in finer air bubbles in the water flow than ever before. From there, the water swirls downstream.

[0027] Here, the liquid pump 13 and the piping 18 function as a swirl mechanism that generates a swirling flow in the second cylindrical liquid path 43 in the direction RV opposite to the specific direction DR. The water flow is swirled around the central axis 19 before flowing into the second cylindrical liquid path 43. The swirling of the water, in combination with the swirling of the air, contributes to the atomization of air bubbles. The atomization of air bubbles is further achieved efficiently in the water flow. Moreover, since the inlet end of the first cylindrical body 42 is connected to the introduction piping 22, which is coaxial with the first cylindrical liquid path 41 and forms a linear region with a set length Ls, the swirling of the water is well maintained in the linear region. The water flow is swirled around the central axis 19 effectively before flowing into the third cylindrical liquid path 45.

[0028] As water flows successively through the second cylindrical liquid path 43 and the third cylindrical liquid path 45, negative pressure is generated along the cylindrical surface at the inlet end of the third cylindrical liquid path 45 as the diameter of the third cylindrical liquid path 45 expands. The generated negative pressure draws air into the third cylindrical liquid path 45 through the grooves 66. The air is ejected into the water flow. The water flow shears the air, resulting in finer air bubbles (microbubbles) mixed into the water flow. The grooves 66 on the end surface extend centrifugal from a diameter Dm, tilting circumferentially toward a specific direction DR. Therefore, when the air is mixed into the water flow, it swirls in the direction RV opposite the specific direction DR. The cylindrical surface of the third cylindrical liquid path 45 effectively guides the swirling air. The air ejected at the end of the second cylindrical liquid path 43 effectively maintains the swirling of the water in the third cylindrical liquid path 45. This improves the efficiency of air bubble refinement in the water flow.

[0029] As water flows successively through the third cylindrical liquid path 45 and the fourth cylindrical liquid path 47, negative pressure is generated along the cylindrical surface at the inlet end of the fourth cylindrical liquid path 47 as the diameter of the fourth cylindrical liquid path 47 expands. The generated negative pressure draws air into the fourth cylindrical liquid path 47 through the grooves 75. The air is ejected into the water flow. The water flow shears the air, resulting in finer air bubbles (microbubbles) mixed into the water flow. The grooves 75 on the end surface extend in the centrifugal direction, inclined circumferentially from the diameter Dm toward the specific direction DR. Therefore, when the air is mixed into the water flow, it swirls in the direction RV opposite the specific direction DR. The cylindrical surface of the fourth cylindrical liquid path 47 effectively guides the swirling air. The air ejected at the end of the fourth cylindrical liquid path 47 effectively maintains the swirling of the water in the fourth cylindrical liquid path 47. Air bubbles are efficiently atomized in the water flow.

[0030] In this embodiment, the injection cylinder 48 is screwed into the outer cylinder 76, so the position of the injection cylinder 48 is adjusted in the axial direction relative to the outer cylinder 76. Any dimensional errors in the axial direction of the first cylinder 42, second cylinder 44, third cylinder 46, injection cylinder 48, and outer cylinder 76 are absorbed. In this way, the first cylinder 42 and the second cylinder 44 make good surface contact at the first mating surface 51. The second cylinder 44 and the third cylinder 46 make good surface contact at the second mating surface 59. The third cylinder 46 and the injection cylinder 48 make good surface contact at the third mating surface 68. In addition to injection via a passage, gas Air leakage from the chamber 77 to the second cylindrical liquid passage 43, the third cylindrical liquid passage 45, and the fourth cylindrical liquid passage 47 is prevented. gas This prevents liquid from leaking into the chamber 77. In particular, since the first cylindrical body 42 is fixed to the outer cylinder 76 with the fastener 79 and the injection cylinder 48 is screwed into the outer cylinder 76, the screw-in position on the outer cylinder 76 is farthest from the first mating surface 51. The effect of misalignment of the screws on the surface contact between the first cylindrical body 42 and the second cylindrical body 44 is minimized.

[0031] 7, between the first cylindrical body 42 and the second cylindrical body 44, the gas chamber 77 may be connected to the second cylindrical liquid passage 43 by a slit St instead of the groove 57 described above. The slit St is defined by the end face of the first cylindrical body 42 and the inlet end of the second cylindrical body 44. The inlet end of the second cylindrical body 44 faces the end face of the first cylindrical body 42 at a regular interval. The slit St continues around the entire circumference of the central axis 19 and opens into the second cylindrical liquid passage 43.

[0032] Here, the second cylindrical body 44 is in liquid-tight contact with the outflow end of the first cylindrical body 42 at a mating surface 86. A cylindrical body 87, which forms the mating surface 86 at its end, is fixed to the outflow end of the first cylindrical body 42. The inflow end of the second cylindrical body 44 is formed with an inserting tube 88 that protrudes from a plane including the mating surface 86 and is inserted into the cylindrical body 87. The inserting tube 88 is formed with an annular step 89 that extends coaxially with the central axis 19. The step 89 forms a small-diameter tube 91 whose outer diameter is smaller than the inner surface of the cylindrical body 87. An annular chamber 92 is defined between the cylindrical body 87 and the small-diameter tube 91. The slit St forms a passage between the first cylindrical body 42 and the second cylindrical body 44, connecting the annular chamber 92 to the second cylindrical liquid passage 43.

[0033] A through hole 93 extending in the centrifugal direction from the annular chamber 92 is formed in the cylindrical body 87. The through hole 93 connects the annular chamber 92 to the gas chamber 77. The annular chamber 92 and the through hole 93 connect the gas chamber 77 to the slit St.

[0034] As shown in Figure 8, a shape 94 is formed on the end face of the second cylindrical body 44. The shape 94 extends in the centrifugal direction while inclining from the diameter Dm in the circumferential direction toward the specific direction DR at an inclination angle θ. Here, the shape 94 is formed by a protrusion protruding from the end face of the second cylindrical body 44. The shape 94 rectifies the flow of gas injected into the second cylindrical liquid path 43. The shape 94 acts to swirl the liquid flow around the central axis 19 in the direction RV opposite to the specific direction DR.

[0035] As the liquid flows successively through the first cylindrical liquid path 41 and the second cylindrical liquid path 43, a negative pressure is generated along the cylindrical surface at the inlet end of the second cylindrical liquid path 43 as the diameter of the second cylindrical liquid path 43 expands. In response to the generation of negative pressure, gas is drawn into the second cylindrical liquid path 43 through the slit St. The gas is ejected into the liquid over a wide area in the circumferential direction. The liquid flow shears the gas, resulting in fine bubbles (microbubbles) mixed into the liquid. Within the slit St, a shape 94 is formed that extends in the centrifugal direction from the diameter Dm, inclining in the circumferential direction toward the specific direction DR. Therefore, when the gas mixes with the liquid, it swirls in the direction RV opposite the specific direction DR. The cylindrical surface of the second cylindrical liquid path 43 effectively guides the swirling of the gas. Because the liquid flow velocity is fastest in the first cylindrical liquid path 41, which has the smallest diameter, the swirling effect is maximized. The liquid swirls downstream.

[0036] Note that the shape 94 may be formed on the end surface of the first cylindrical body 42 instead of the second cylindrical body 44. As shown in Fig. 9, when forming the slit St, the cylindrical body 87 may be fixed to the second cylindrical body 44, while the fitting tube 88 may be formed in the first cylindrical body 42. Similarly, the slit St may be formed instead of the grooves 66, 75 between the second cylindrical body 44 and the third cylindrical body 46 or between the third cylindrical body 46 and the injection cylindrical body 48. In the shape 94, a groove may be used instead of a protrusion.

[0037] Alternatively, the aeration device 11 may use an axial pump 95 as the swirl mechanism, as shown in FIG. 10 . The axial pump 95 includes an impeller 97 that rotates around a rotation axis 96. The rotation axis 96 coincides with the axis of the discharge pipe 17. The rotation of the impeller 97 not only imparts axial thrust to the liquid, but also imparts a swirling force around the rotation axis 96. The axial pump 95 generates a swirling flow in the second cylindrical liquid passage 43 in the direction RV opposite to the specific direction DR. The swirling of the liquid, in combination with the swirling of the gas, contributes to the atomization of bubbles. The atomization of bubbles within the liquid flow is further achieved efficiently. Furthermore, the inlet end of the first cylindrical body 42 is connected to the inlet pipe 22, which is coaxial with the first cylindrical liquid passage 41 and forms a linear region with a predetermined length Ls. This effectively maintains the swirling of the liquid flow in the linear region. Prior to entering the third cylindrical passage 45, the liquid flow is effectively forced to swirl about the central axis 19. [Explanation of symbols]

[0038] 12 Air mixing nozzle 13 Liquid pump (one component of the rotation mechanism) 18 Piping (one component of the rotation mechanism) 22 Inlet piping 41 First cylindrical liquid passage 42 First cylinder 43 Second cylindrical liquid passage 44 Second cylinder 45 Third cylindrical liquid passage 46 Third cylinder 48 Injection cylinder 51 Mating surface (first mating surface) 57 Groove (Passage) 66 Groove (Passage) 75 Groove (Passage) 76 Outer cylinder 77 Gas Chamber 79 Fixtures 86 Mating surface Da First diameter (smallest diameter) Db 2nd diameter Dc Third diameter DR specific direction Ls: the determined length RV facing the opposite direction St Slit

Claims

1. a first cylindrical body forming a first cylindrical liquid passage having a minimum diameter and opening at an outlet end; a second cylindrical body connected to an outlet end of the first cylindrical body and defining a second cylindrical liquid passage having a second diameter larger than the minimum diameter and coaxially connected to the first cylindrical liquid passage; a groove formed on an inlet end surface of the second cylindrical body, extending in a centrifugal direction while inclining in a specific direction from a diameter to a circumferential direction, and opening into the second cylindrical liquid passage; an outer cylinder that surrounds the first cylinder and the second cylinder and defines a gas chamber connected to the groove on an outer surface of the second cylinder, The second cylindrical liquid passage is bounded by a cylindrical surface that continues downstream from the opening of the groove. Mixing nozzle.

2. a swirl mechanism disposed upstream of the first cylindrical body and generating a swirling flow in the second cylindrical liquid path in a direction opposite to the specific direction; The air-mixing nozzle according to claim 1 .

3. An inlet pipe is connected to the inlet end of the first cylindrical body, and the inlet pipe is coaxial with the first cylindrical liquid passage and forms a linear region with a predetermined length. The air-mixing nozzle according to claim 2.

4. a third cylindrical body connected to the outlet end of the second cylindrical body within the outer cylinder, the third cylindrical body having a cylindrical surface with a third diameter larger than the second diameter and coaxially connected to the second cylindrical liquid passage, and forming a third cylindrical liquid passage; a groove formed on the end surface of the third cylindrical body, extending in the centrifugal direction while inclining in a specific direction from the diameter in the circumferential direction, and connecting the gas chamber to the third cylindrical liquid path; The air-mixing nozzle according to claim 3.

5. a first cylindrical body forming a first cylindrical liquid passage having a minimum diameter and opening at an outlet end; a second cylindrical body having an end surface that is coaxially connected to an outlet end of the first cylindrical body, and that defines a second cylindrical liquid passage having a second diameter larger than the minimum diameter and that is coaxially connected to the first cylindrical liquid passage, and that defines a slit that is continuous around the entire circumference of the axis between the second cylindrical body and the outlet end and that opens into the second cylindrical liquid passage; an outer cylinder that surrounds the first cylinder and the second cylinder and defines a gas chamber connected to the slit on an outer surface of the second cylinder, The second cylindrical liquid passage is partitioned by a cylindrical surface that continues downstream from the slit, and a shape that extends in the centrifugal direction while inclining in a specific direction from the diameter to the circumferential direction is formed on the inlet side end surface of the second cylindrical body. Mixing nozzle.

6. a swirl mechanism disposed upstream of the first cylindrical body and generating a swirling flow in the second cylindrical liquid path in a direction opposite to the specific direction; The air-mixing nozzle according to claim 5.

7. An inlet pipe is connected to the inlet end of the first cylindrical body, and the inlet pipe is coaxial with the first cylindrical liquid passage and forms a linear region with a predetermined length. The air-mixing nozzle according to claim 6.

8. a third cylindrical body that is coaxially connected to the outlet end of the second cylindrical body within the outer cylinder and that defines a third cylindrical liquid passage with a cylindrical surface having a third diameter that is larger than the second diameter and that is coaxially connected to the second cylindrical liquid passage; a groove formed on the end surface of the third cylindrical body, extending in the centrifugal direction while inclining in a specific direction from the diameter in the circumferential direction, and connecting the gas chamber to the third cylindrical liquid path; The air-mixing nozzle according to claim 7.

Images