Aerosol nozzle

Abstract

This invention provides a mixing nozzle that can utilize swirling flow more efficiently than ever before to achieve micronization of bubbles in a liquid flow. [Solution] The mixing nozzle 12 comprises a first cylindrical body 42 that forms a first cylindrical liquid passage 41 with a minimum diameter Da that opens at the outlet end, a second cylindrical body 44 connected to the outlet end of the first cylindrical body 42 and forming a second cylindrical liquid passage 43 with a second diameter Db that is larger than the minimum diameter Da and coaxially connected to the first cylindrical liquid passage 41, a groove formed on the end face of the second cylindrical body 44 that extends centrifugally while being inclined in a specific direction circumferentially from the diameter and 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 partitions 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 Art

[0002] Patent Document 1 discloses an air - mixing nozzle that partitions a first cylindrical water passage having a first diameter and a second cylindrical water passage having a second diameter larger than the first diameter. In the second cylindrical water passage, a passage for injecting air from an atmospheric - pressure air chamber into the water flow opens according to the diameter expansion from the first diameter to the second diameter. The passage extends in a centrifugal direction while inclining in a specific direction in the circumferential direction from the diameter of the water passage. Therefore, at the time of injection, the air swirls in the opposite direction to the specific direction.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] A longitudinal groove extending in the axial direction is formed on the inner wall surface of the second cylindrical water passage. The air passage opens into the second cylindrical water passage within the longitudinal groove. It was considered that the corner at the end of the longitudinal groove greatly contributed to the refinement of bubbles entrained in the water flow compared to the swirl of air.

[0005] An object of the present invention is to provide an air - mixing nozzle that can more efficiently utilize a swirling flow to achieve bubble refinement in a liquid flow.

Means for Solving the Problems

[0006] According to one embodiment of the present invention, a mixing nozzle is provided comprising: a first cylindrical body that forms a first cylindrical liquid passage of the smallest diameter that opens at the outlet end; a second cylindrical body connected to the outlet end of the first cylindrical body and coaxially connected to the first cylindrical liquid passage, forming a second cylindrical liquid passage of a second diameter larger than the smallest diameter; a groove formed on the end face of the second cylindrical body that extends centrifugally while being inclined in a specific direction circumferentially from the diameter and opening into the second cylindrical liquid passage; and an outer cylinder that surrounds the first cylindrical body and the second cylindrical body and partitions a gas chamber connected to the groove on the outer surface of the second cylindrical body. [Effects of the Invention]

[0007] As described above, according to the disclosed concept, a mixing nozzle is provided that can utilize swirling flow more efficiently than ever before to achieve bubble miniaturization in a liquid flow. [Brief explanation of the drawing]

[0008] [Figure 1] This is a conceptual diagram illustrating the configuration of an aeration device 11 according to an embodiment of the present invention. [Figure 2] This is a conceptual diagram of the liquid pump as seen from arrow 2 in Figure 1. [Figure 3] This is an enlarged cross-sectional view illustrating the structure of the mixing nozzle. [Figure 4] This diagram shows the passageway partitioned between the first and second cylindrical bodies. [Figure 5] This diagram shows the passageway partitioned between the second and third cylindrical bodies. [Figure 6] This diagram shows the passage partitioned between the third cylinder and the injection cylinder. [Figure 7] This is an enlarged cross-sectional view showing a passage according to another embodiment. [Figure 8] This is a conceptual diagram showing the flow-rectifying shape arranged within the slit. [Figure 9] This is a conceptual diagram showing a modified example of the passageway, corresponding to Figure 7. [Figure 10] This is a conceptual diagram corresponding to Figure 1, illustrating a rotation mechanism according to another embodiment. [Modes for carrying out the invention]

[0009] One embodiment of the present invention will be described below with reference to the attached drawings.

[0010] Figure 1 schematically shows an aeration device 11 according to an embodiment of the present invention. The aeration device 11 comprises a mixing nozzle 12 that mixes gas with a liquid and ejects the liquid, a liquid pump 13 connected to the mixing nozzle 12 and supplying liquid to the mixing nozzle 12, and a supply pipe 14 that supplies gas to the mixing nozzle 12. The liquid pump 13 is located inside a strainer 15. The nozzle 12a of the mixing nozzle 12 opens in the space outside the strainer 15. The strainer 15 is submerged in water, for example. The upper end of the supply pipe 14 is located in the atmosphere.

[0011] The liquid pump 13 draws in surrounding liquid from the suction port 16 into the strainer 15. The strainer 15 removes solid matter from the liquid. The drawn-in liquid is discharged from the discharge pipe 17 under a predetermined pressure. The discharge pipe 17 is positioned horizontally.

[0012] The discharge pipe 17 of the liquid pump 13 and the inlet end of the aeration nozzle 12 are connected by a pipe 18. The pipe 18 includes an inlet pipe 22 that is coupled to the inlet end of the aeration nozzle 12 and forms a flow path 21 coaxially with the central axis 19 of the aeration nozzle 12. The flow path 21 in the inlet pipe 22 is continuous with the liquid passage in the aeration nozzle 12 and forms a straight area for a predetermined length Ls from the liquid passage in the aeration nozzle 12. The axis 23 of the inlet pipe 22 is positioned horizontally. The inlet end of the inlet pipe 22 is connected to an intermediate pipe 25 by an elbow joint 24. The intermediate pipe 25 has an axis 26 perpendicular to the axis 23 of the inlet pipe 22. The intermediate pipe 25 is upright. The inlet end of the intermediate pipe 25 is connected to the discharge pipe 17 of the liquid pump 13 by an elbow joint 27.

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

[0014] As shown in FIG. 3, the air-fuel mixture nozzle 12 includes a first cylindrical body 42 that forms a first cylindrical liquid passage 41 with a first diameter Da that opens at the outflow end, a second cylindrical body 44 connected to the outflow end of the first cylindrical body 42 and forming a second cylindrical liquid passage 43 with a second diameter Db that is continuous from the first cylindrical liquid passage 41, a third cylindrical body 46 connected to the outflow end of the second cylindrical body 44 and forming a third cylindrical liquid passage 45 with a third diameter Dc that is continuous from the second cylindrical liquid passage 43, and an injection cylindrical body 48 connected to the outflow end of the third cylindrical body 46 and forming a fourth cylindrical liquid passage 47 with a fourth diameter Dd that is continuous from the third cylindrical liquid passage 45. The inflow 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 introduction pipe 22 to the injection port 12a.

[0015] The first diameter Da of the first cylindrical liquid passage 42 is set to the minimum diameter. The second cylindrical liquid passage 43 is coaxially connected to the first cylindrical liquid passage 41. The second diameter Db is set larger than the first diameter Da. The second diameter Db is determined based on the flow velocity of the liquid (for example, water) flowing out from the first cylindrical body 42. The second diameter Db has a size that generates a negative pressure along the cylindrical surface according to the diameter expansion.

[0016] The third cylindrical liquid passage 45 is coaxially connected to the second cylindrical liquid passage 43. The third diameter Dc is set larger than the second diameter Db. The third diameter Dc is determined based on the flow velocity of the liquid (for example, water) flowing out from the second cylindrical body 44. The third diameter Dc has a size that generates a negative pressure along the cylindrical surface according to the diameter expansion.

[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 velocity of the liquid (e.g., water) flowing out from the third cylindrical body 46. The fourth diameter Dd has a size that generates a negative pressure along the cylindrical surface according to the diameter expansion.

[0018] The second cylindrical body 44 is in liquid-tight contact with the outflow end of the first cylindrical body 42 at the first mating surface 51. At the outflow end of the first cylindrical body 42, a cylindrical body 52 that coaxially surrounds the first mating surface 51 is fixed to the first cylindrical liquid passage 41. The cylindrical body 52 may be integrally formed with the first cylindrical body 42. At the inflow end of the second cylindrical body 44, a fitting cylinder 53 that fits into the cylindrical body 52 is formed. An annular step 54 that surrounds the first mating surface 51 is formed on the fitting cylinder 53. The step 54 forms a small-diameter cylinder 55 having an outer shape smaller than the inner surface of the cylindrical body 52. An annular chamber 56 is partitioned between the cylindrical body 52 and the small-diameter cylinder 55. A groove 57 that opens to the second cylindrical liquid passage 43 is formed on the end face of the second cylindrical body 44. As shown in FIG. 4, the groove 57 extends linearly in the centrifugal direction while inclining at an inclination angle θ in a specific direction DR in the circumferential direction from the diameter Dm. The groove 57 opens to the annular chamber 56. The groove 57 forms a passage that connects the annular chamber 56 to the second cylindrical liquid passage 43 between the first cylindrical body 42 and the second cylindrical body 44.

[0019] The third cylindrical body 46 is in liquid-tight contact with the outlet end of the second cylindrical body 44 at the second mating surface 59. A cylindrical body 61 surrounding the second mating surface 59 is fixed to the outlet end of the second cylindrical body 44, coaxially with the second cylindrical liquid passage 43. The cylindrical body 61 may be integrally formed with the second cylindrical body 44. A fitting cylinder 62 that fits into the cylindrical body 61 is formed at the inlet end of the third cylindrical body 46. An annular step 63 surrounding the second mating surface 59 is formed in the fitting cylinder 62. The step 63 forms a small-diameter cylinder 64 having an outer diameter smaller than the inner surface of the cylindrical body 61. An annular chamber 65 is partitioned between the cylindrical body 61 and the small-diameter cylinder 64. A groove 66 opening into the third cylindrical liquid passage 45 is formed on the end face of the third cylindrical body 46. As shown in Figure 5, the groove 66 extends linearly in the centrifugal direction, inclined circumferentially at an angle θ in a specific direction DR from a diameter Dm. The groove 66 opens into the annular chamber 65. Between the second cylindrical body 44 and the third cylindrical body 46, the groove 66 forms a passage 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, coaxially with the third cylindrical liquid passage 45 and surrounding the third mating surface 68. The cylindrical body 69 may be integrally formed with the third cylinder 46. A fitting cylinder 71 is formed at the inlet end of the injection cylinder 48, which fits into the cylindrical body 69. An annular step 72 is formed in the fitting cylinder 71, surrounding the third mating surface 68. The step 72 forms a small-diameter cylinder 73 having an outer diameter smaller than the inner surface of the cylindrical body 69. An annular chamber 74 is partitioned between the cylindrical body 69 and the small-diameter cylinder 73. A groove 75 opening to the fourth cylindrical liquid passage 47 is formed on the end face of the injection cylinder 48. As shown in Figure 6, the groove 75 extends linearly in the centrifugal direction, inclined circumferentially at an angle θ in a specific direction DR from a diameter Dm. The groove 75 opens into the annular chamber 74. The groove 75 forms a passage between the third cylinder 46 and the injection cylinder 48, connecting the annular chamber 74 to the fourth cylindrical liquid passage 47.

[0021] The gas mixing nozzle 12 comprises an outer cylinder 76 surrounding a first cylinder 42, a second cylinder 44, a third cylinder 46, and an injection cylinder 48. A gas chamber 77 is partitioned 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 are formed in the individual cylinders 52, 61, and 69, extending centrifugally from annular chambers 56, 65, and 74. The through holes 78a, 78b, and 78c connect the gas chamber 77 to the annular chambers 56, 65, and 74 for each cylinder 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 individual grooves 57, 66, and 75.

[0022] The first cylindrical body 42 is fixed to the outer cylinder 76 so as not to be displaced in the axial direction. For fixing, a fastener 79 such as a bolt is used. The bolt is screwed radially into the outer surface of the outer cylinder 76 and exerts 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 instead of a bolt for the fastener 79.

[0023] The injection cylinder 48 is screwed 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. Due to the fastening force, the end face of the second cylinder 44 is in close contact with the first cylinder 42 at the first mating surface 51. Similarly, the end face of the third cylinder 46 is in close contact with the second cylinder 44 at the second mating surface 59. Similarly, the end face of the injection cylinder 48 is in close contact with 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, separating the end of the male screw groove 81 in the axial direction. The male screw groove 81 of the injection cylinder 48 is securely engaged with the female screw 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 in close contact with each other.

[0024] The outer surface of the injection cylinder 48 is chamfered 83 parallel to the central axis 19. When a tool is engaged with the parallel faces of the chamfered 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. The outer surface of the first cylinder 42 is chamfered 84 parallel to the central axis 19. When a tool is engaged with the parallel faces of the chamfered 84, the first cylinder 42 is screwed into the introduction pipe 22 by the action of the tool. Since the chamfered 84 is positioned outside the outer cylinder 76 in the axial direction, relative rotation between the first cylinder 42 and the outer cylinder 76 is avoided during screwing. A male screw groove 85 is engraved on the outer surface of the first cylinder 42 between the outlet end and the chamfered 84.

[0025] Next, the operation of the aeration device 11 will be explained. The aeration device 11 is installed in water, such as in a pond or aquarium. The upper end of the supply pipe 14 is above the water surface and open to the atmosphere. When the liquid pump 13 is activated, water is supplied from the piping 18 to the mixing nozzle 12. The water then flows through 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. The water is then injected into the water from the nozzle 12a of the injection cylinder 48.

[0026] As water flows successively through the first cylindrical liquid channel 41 and the second cylindrical liquid channel 43, a negative pressure is generated along the cylindrical surface at the inlet end of the second cylindrical liquid channel 43 as its diameter expands. In response to the generation of the negative pressure, air is drawn into the second cylindrical liquid channel 43 from the groove 57. The air is ejected into the water flow. As the water flow shears the air, finely divided bubbles (microbubbles) are mixed into the water flow. The groove 57 on the end face extends centrifugally while inclined circumferentially in a specific direction DR from its diameter Dm, so when the air is mixed into the water flow, it swirls in the opposite direction RV to the specific direction DR. The cylindrical surface of the second cylindrical liquid channel 43 guides the swirl of the air well. Since the water flow velocity is fastest in the first cylindrical liquid channel 41, which has the smallest diameter, the effect of the swirl is maximized. The micronization of bubbles in the water flow is achieved more than ever before. From there, the swirl of the water is generated downstream.

[0027] Here, the liquid pump 13 and piping 18 function as a swirling mechanism that generates a swirling flow in the second cylindrical liquid channel 43 in a specific direction DR and in the opposite direction RV. Prior to its inflow into the second cylindrical liquid channel 43, the water flow is given a swirling motion around the central axis 19. The swirling of the water, in combination with the swirling of the air, contributes to the miniaturization of bubbles. Furthermore, bubble miniaturization is achieved more efficiently in the water flow. Moreover, since the inflow end of the first cylinder 42 is connected to an introduction pipe 22 that forms a straight section with a predetermined length Ls coaxially with the first cylindrical liquid channel 41, the swirling of the water is well maintained in the straight section. Prior to its inflow into the third cylindrical liquid channel 45, the water flow is effectively given a swirling motion around the central axis 19.

[0028] As water flows successively through the two cylindrical liquid channels 43 and the third cylindrical liquid channel 45, a negative pressure is generated along the cylindrical surface at the inlet end of the third cylindrical liquid channel 45 as its diameter expands. In response to the generation of negative pressure, air is drawn from the groove 66 into the third cylindrical liquid channel 45. The air is ejected into the water flow. As the water flow shears the air, finely divided bubbles (microbubbles) are mixed into the water flow. The groove 66 on the end face extends centrifugally while inclined circumferentially in a specific direction DR from its diameter Dm, so when the air is mixed into the water flow, it swirls in the opposite direction RV to the specific direction DR. The cylindrical surface of the third cylindrical liquid channel 45 guides the swirl of the air well. The air ejected at the end of the second cylindrical liquid channel 43 maintains the swirl of the water well in the third cylindrical liquid channel 45. The micronization of bubbles in the water flow is made more efficient.

[0029] As water flows successively through the three cylindrical liquid channels 45 and the fourth cylindrical liquid channel 47, a negative pressure is generated along the cylindrical surface at the inlet end of the fourth cylindrical liquid channel 47 as its diameter expands. In response to the generation of the negative pressure, air is drawn from the groove 75 into the fourth cylindrical liquid channel 47. The air is ejected into the water flow. As the water flow shears the air, finely divided bubbles (microbubbles) are mixed into the water flow. The groove 75 on the end face extends centrifugally while inclined circumferentially in a specific direction DR from its diameter Dm, so when the air is mixed into the water flow, it swirls in the opposite direction RV to the specific direction DR. The cylindrical surface of the fourth cylindrical liquid channel 47 guides the swirl of the air well. The air ejected at the end of the fourth cylindrical liquid channel 47 maintains the swirl of the water well in the fourth cylindrical liquid channel 47. The micronization of bubbles in the water flow is made more efficient.

[0030] In this embodiment, since the injection cylinder 48 is screwed into the outer cylinder 76, the position of the injection cylinder 48 is adjusted axially with respect to the outer cylinder 76. Dimensional errors of the first cylinder 42, second cylinder 44, third cylinder 46, injection cylinder 48, and outer cylinder 76 are absorbed axially. Thus, 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. Except for injection through the passages, air leakage from the air chamber 77 to the second cylindrical liquid passage 43, the third cylindrical liquid passage 45, and the fourth cylindrical liquid passage 47 is prevented. Conversely, leakage of liquid from the second cylindrical liquid passage 43, the third cylindrical liquid passage 45, and the fourth cylindrical liquid passage 47 into the air chamber 77 is prevented. In particular, since the first cylinder 42 is fixed to the outer cylinder 76 with a fastener 79 and the injection cylinder 48 is screwed into the outer cylinder 76, the screw-in position on the outer cylinder 76 is furthest from the first mating surface 51. The effect of misalignment of the screw on the surface contact between the first cylinder 42 and the second cylinder 44 is minimized.

[0031] As shown in Figure 7, between the first cylinder 42 and the second cylinder 44, the gas chamber 77 may be connected to the second cylindrical liquid passage 43 based on a slit St instead of the groove 57 described above. The slit St is demarcated by the end face of the first cylinder 42 and the inlet end of the second cylinder 44. The inlet end of the second cylinder 44 is aligned with the end face of the first cylinder 42 at regular intervals. The slit St is continuous 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 outlet 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 outlet end of the first cylindrical body 42. At the inlet end of the second cylindrical body 44, a fitting cylinder 88 is formed that protrudes from the plane including the mating surface 86 and is fitted into the cylindrical body 87. An annular step 89 is formed in the fitting cylinder 88, extending coaxially with the central axis 19. The step 89 forms a small-diameter cylinder 91 having an outer diameter smaller than the inner surface of the cylindrical body 87. An annular chamber 92 is partitioned between the cylindrical body 87 and the small-diameter cylinder 91. The slit St forms a passage between the first cylindrical body 42 and the second cylindrical body 44 that connects the annular chamber 92 to the second cylindrical liquid channel 43.

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

[0034] As shown in Figure 8, a shape 94 is formed on the end face of the second cylindrical body 44, extending centrifugally while being inclined circumferentially from the diameter Dm in a specific direction DR at an angle θ. Here, the shape 94 is formed by a projection protruding from the end face of the second cylindrical body 44. The shape 94 rectifies the gas injected into the second cylindrical liquid channel 43. Due to the action of the shape 94, the liquid flow is swirled around the central axis 19 in the opposite direction RV in the specific direction DR.

[0035] As the liquid flows successively through the first cylindrical liquid channel 41 and the second cylindrical liquid channel 43, a negative pressure is generated along the cylindrical surface at the inlet end of the second cylindrical liquid channel 43 as its diameter expands. In response to the generation of the negative pressure, gas is drawn into the second cylindrical liquid channel 43 from the slit St. Gas is ejected into the liquid over a wide area in the circumferential direction. As the liquid flow shears the gas, finely divided bubbles (microbubbles) are mixed into the liquid. Within the slit St, a shape 94 is formed that extends centrifugally while inclined in a specific direction DR circumferentially from a diameter Dm. Therefore, when the gas mixes into the liquid, it swirls in the opposite direction RV to the specific direction DR. The cylindrical surface of the second cylindrical liquid channel 43 guides the swirling of the gas well. Since the liquid flow velocity is fastest in the first cylindrical liquid channel 41, which has the smallest diameter, the effect of the swirl is maximized. The swirl of the liquid is generated downstream.

[0036] Furthermore, shape 94 may be formed on the end face of the first cylinder 42 instead of the second cylinder 44. As shown in Figure 9, when forming the slit St, the cylindrical body 87 may be fixed to the second cylinder 44, while the fitting cylinder 88 may be formed on the first cylinder 42. In addition, slit St may be formed in place of grooves 66 and 75 between the second cylinder 44 and the third cylinder 46, and between the third cylinder 46 and the injection cylinder 48. A groove may be used in place of a projection for shape 94.

[0037] In addition, as shown in Figure 10, an axial flow pump 95 may be used in the swirling mechanism of the aeration device 11. The axial flow pump 95 is equipped with 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 imparts not only an axial thrust force to the liquid but also a swirling force around the rotation axis 96. The axial flow pump 95 generates a swirling flow in the second cylindrical liquid passage 43 in a specific direction DR and in the opposite direction RV. The swirling of the liquid, in combination with the swirling of the gas, contributes to the refinement of bubbles. Furthermore, bubble refinement is achieved more efficiently in the liquid flow. Moreover, since an introduction pipe 22 that forms a straight section with a predetermined length Ls coaxially with the first cylindrical liquid passage 41 is connected to the inlet end of the first cylindrical body 42, the swirling of the liquid flow is well maintained in the straight section. Prior to its inflow into the third cylindrical liquid channel 45, the liquid flow is effectively given a swirling motion around the central axis 19. [Explanation of Symbols]

[0038] 12. Mixing nozzle 13. Liquid pump (one component of the swivel mechanism) 18. Piping (one component of the swivel mechanism) 22 Inlet Piping 41. First cylindrical liquid channel 42 First cylinder 43. Second cylindrical liquid channel 44 Second cylinder 45. Third cylindrical liquid channel 46 Third cylinder 48 Injection cylinder 51. Machining 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 1st diameter (minimum diameter) Db (2nd diameter) Dc (3rd diameter) DR specific direction Ls (Determined length) RV facing the wrong way St Slit

Claims

1. A first cylindrical body that forms the first cylindrical liquid channel with the smallest diameter that opens at the outlet end, A second cylindrical body is connected to the outlet end of the first cylindrical body and forms a second cylindrical liquid passage having a second diameter larger than the minimum diameter, which is coaxially connected to the first cylindrical liquid passage. A groove formed on the end face of the second cylindrical body, extending centrifugally while being inclined in a specific direction from the diameter in the circumferential direction, and opening into the second cylindrical liquid passage, An outer cylinder enclosing the first cylinder and the second cylinder, and partitioning the gas chamber connected to the groove on the outer surface of the second cylinder, A mixing nozzle equipped with the following features.

2. The system includes a swirling mechanism positioned upstream of the first cylindrical body, which generates a swirling flow in the second cylindrical liquid channel in the opposite direction to the specific direction. The mixing nozzle according to claim 1.

3. An inlet pipe is connected to the inlet end of the first cylindrical body, forming a straight section of a predetermined length coaxial with the first cylindrical liquid passage. The mixing nozzle according to claim 2.

4. A third cylindrical body is connected to the outlet end of the second cylindrical body within the outer cylinder and forms a third cylindrical liquid passage having a third diameter larger than the second diameter, which is coaxially connected to the second cylindrical liquid passage. The end face of the third cylindrical body is formed with a groove that extends centrifugally while being inclined in a specific direction circumferentially from the diameter, and connects the air chamber to the third cylindrical liquid passage. The mixing nozzle according to claim 3.

5. A first cylindrical body that forms the first cylindrical liquid channel with the smallest diameter that opens at the outlet end, A second cylindrical body is coaxially connected to the outlet end of the first cylindrical body, forming a second cylindrical liquid passage with a second diameter larger than the minimum diameter coaxially connected to the first cylindrical liquid passage, and having an end face that is continuous around the entire circumference with respect to the outlet end and forms a slit that opens into the second cylindrical liquid passage. The apparatus comprises an outer cylinder that surrounds the first cylinder and the second cylinder, and that partitions the gas chamber connected to the slit on the outer surface of the second cylinder, The end face of the second cylindrical body is formed with a shape that extends centrifugally while being inclined in a specific direction from the diameter in the circumferential direction. Aerosol nozzle.

6. The system includes a swirling mechanism positioned upstream of the first cylindrical body, which generates a swirling flow in the second cylindrical liquid channel in the opposite direction to the specific direction. The mixing nozzle according to claim 5.

7. An inlet pipe is connected to the inlet end of the first cylindrical body, forming a straight section of a predetermined length coaxial with the first cylindrical liquid passage. The mixing nozzle according to claim 6.

8. A third cylindrical body is coaxially connected to the outlet end of the second cylindrical body within the outer cylinder and forms a third cylindrical liquid passage having a third diameter larger than the second diameter, which is coaxially connected to the second cylindrical liquid passage. The end face of the third cylindrical body is formed with a groove that extends centrifugally while being inclined in a specific direction circumferentially from the diameter, and connects the air chamber to the third cylindrical liquid passage. The mixing nozzle according to claim 7.

9. A first cylindrical body that forms a first cylindrical liquid channel with a first diameter that opens at the outlet end and guides the flow of liquid, A second cylindrical body is connected to the outlet end of the first cylindrical body at a mating surface and forms a second cylindrical liquid passage having a second diameter larger than the first diameter, which is coaxially connected to the first cylindrical liquid passage. A passage formed in the second cylindrical body and opening into the second cylindrical liquid passage, which injects gas into the liquid flow based on the diameter expansion from the first diameter to the second diameter, An outer cylinder enclosing the first cylinder and the second cylinder, and partitioning the gas chamber connected to the passage on the outer surface of the second cylinder, The system includes an injection cylinder connected to the outer cylinder, which generates a holding force to hold the first cylinder and the second cylinder at the mating surface, Either the first cylinder or the injection cylinder is fixed to the outer cylinder by a fastener so as not to be displaced in the axial direction, and the other of the first cylinder or the injection cylinder is screwed axially into the outer cylinder to exert a fastening force that fixes the first cylinder and the second cylinder together. Aerosol nozzle.

10. The first cylinder is fixed to the outer cylinder with the fastener, and the injection cylinder is screwed into the outer cylinder. The mixing nozzle according to claim 9.

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