JP2020142219A - Micro bubble generating nozzle - Google Patents

Abstract

To provide a micro bubble generating nozzle which can suppress an outer shape in a compact size while simplifying a structure.SOLUTION: A micro bubble generating nozzle includes a cylindrical body 11 which has a central axis O and extends in an axial direction of the central axis O, an interior body 12 arranged inside the cylindrical body 11, and a flow channel 15 formed inside the cylindrical body 11. The flow channel 15 includes an inflow side flow channel part 30 positioned on an end part at one side of the cylindrical body 11 in the axial direction, an outflow side flow channel part 31 positioned on an end part at the other side of the cylindrical body 11 in the axial direction, a micro bubble generating flow channel part 32 positioned between the inflow side flow channel part 30 and the outflow side flow channel part 31 in the axial direction. The micro bubble generating flow channel part 32 is formed of an inner circumferential surface of the cylindrical body 11 and an outer circumferential surface of the interior body 12. The micro bubble generating flow channel part 32 includes an enlarged-diameter flow channel part 32a of which a diameter is enlarged toward the other side in the axial direction, and a reduced-diameter flow channel part 32 which is arranged at the other side of the enlarged-diameter flow channel part 32a and communicates with the enlarged-diameter flow channel part 32a and of which a diameter is reduced toward the other side in the axial direction.SELECTED DRAWING: Figure 2

Description

The present invention relates to a microbubble generating nozzle.

The micro-bubble generating nozzle is provided at the end of a pipe through which liquid flows. The micro-bubble generation nozzle generates micro-bubbles in the liquid flowing inside. The liquid containing microbubbles has a function such as a cleaning effect.
Conventionally, for example, the fine bubble generator of Patent Document 1 is known. In this fine bubble generator, the through hole of the tubular body is twisted in the circumferential direction as it advances in the longitudinal direction of the tubular body, and extends spirally.

Japanese Patent No. 6312768

The conventional micro-bubble generating nozzle has room for improvement in that the outer shape is kept compact while simplifying the structure.

In view of the above circumstances, one of the objects of the present invention is to provide a micro-bubble generating nozzle capable of keeping the outer shape compact while simplifying the structure.

One aspect of the present invention is a microbubble generating nozzle provided in a tube through which a liquid flows, which has a central axis and is arranged inside the tubular body and a tubular body extending in the axial direction of the central axis. The internal body and the flow path formed inside the cylinder are provided, and the flow path includes an inflow side flow path portion located at one end of the cylinder in the axial direction and the cylinder. An outflow side flow path portion located at the other end in the axial direction, and an inflow side flow path portion and the outflow side flow path portion located between the inflow side flow path portion and the outflow side flow path portion in the axial direction. It has a micro bubble generation flow path portion that communicates with a side flow path portion, and the micro bubble generation flow path portion is formed by an inner peripheral surface of the cylinder body and an outer peripheral surface of the interior body, and the micro is formed. The bubble generation flow path portion is arranged on the other side of the diameter-expanded flow path portion in the axial direction and communicates with the diameter-expanded flow path portion so as to increase the diameter toward the other side in the axial direction. It has a diameter-reduced flow path portion that shrinks in diameter toward the direction.

In this micro-bubble generation nozzle, the micro-bubble generation flow path portion has a diameter-expanded flow path portion and a diameter-reduction flow path portion. For this reason, the liquid flows through the micro-bubble generation flow path from the enlarged-diameter flow path to the reduced-diameter flow path, so that the pressure of the liquid in the flow path changes or centrifugal force acts on the liquid, resulting in the liquid. Micro bubbles are generated inside.

In the present invention, it is possible to generate microbubbles while simplifying the structure without forming the flow path in a spiral shape as in the conventional structure. Therefore, it is easy to manufacture the micro-bubble generating nozzle. Further, as compared with the conventional structure, in the present invention, it is easy to keep the total length in the axial direction particularly small. Therefore, the outer shape of the micro-bubble generating nozzle can be suppressed to be compact.

In the micro-bubble generation nozzle, the micro-bubble generation flow path portion preferably has an annular shape extending in the circumferential direction around the central axis.

In this case, the structure of the micro-bubble generation flow path portion can be further simplified, and the manufacture of the micro-bubble generation nozzle becomes easier.

In the micro bubble generation nozzle, the cylinder forms a part of the inner peripheral surface of the cylinder, and the diameter-expanded inner peripheral surface portion whose diameter increases toward the other side in the axial direction and the inner peripheral surface of the cylinder. The interior body comprises a diameter-reduced inner peripheral surface portion which is arranged on the other side in the axial direction of the diameter-expanded inner peripheral surface portion and whose diameter is reduced toward the other side in the axial direction. A part of the outer peripheral surface of the body is formed and the diameter is expanded toward the other side in the axial direction, and a part of the outer peripheral surface of the interior body is formed and the other side of the outer peripheral surface in the axial direction is formed. The diameter-expanded flow path portion is formed by the diameter-expanded inner peripheral surface portion and the diameter-expanded outer peripheral surface portion, and has a diameter-reduced outer peripheral surface portion that is arranged in the above and decreases in diameter toward the other side in the axial direction. The reduced diameter flow path portion is preferably formed by the reduced diameter inner peripheral surface portion and the reduced diameter outer peripheral surface portion.

In this case, since the liquid flows from the enlarged diameter channel portion to the reduced diameter channel portion, the pressure change and the centrifugal force can be stably applied to the liquid in the flow path, and the microbubbles are more stable in the liquid. Occurs.

In the micro-bubble generating nozzle, the diameter-expanded inner peripheral surface portion has a first diameter-expanded concave-convex portion in which a concave-convex shape is repeated along the axial direction, and the enlarged-diameter outer peripheral surface portion has a concave-convex shape along the axial direction. It is preferable to have a second enlarged uneven portion that is repeated.

In this case, since the enlarged inner peripheral surface portion and the enlarged outer peripheral surface portion forming the enlarged diameter flow path portion each have a portion in which the uneven shape is repeated in the axial direction, the liquid flowing inside the enlarged diameter flow path portion is subjected to pressure. It is possible to make it easier for changes and centrifugal forces to act. Further, the cross-sectional shape and cross-sectional area of the enlarged diameter flow path portion change at each position in the axial direction. Therefore, microbubbles are more likely to be generated more stably in the liquid flowing through the enlarged flow path portion.

In the micro-bubble generating nozzle, the convex portion of the first diameter-expanded uneven portion and the convex portion of the second diameter-expanded concave-convex portion are arranged so as to face each other, and the concave portion of the first diameter-expanded concave-convex portion and the concave portion. It is preferable that the recesses of the second diameter-expanded uneven portion are arranged so as to face each other.

In this case, the cross-sectional shape and cross-sectional area of the enlarged diameter flow path portion change more greatly at each position in the axial direction. Therefore, microbubbles are more stably generated in the liquid flowing through the expanded flow path portion.

In the micro-bubble generating nozzle, the reduced-diameter inner peripheral surface portion has a first reduced-diameter concavo-convex portion in which a concavo-convex shape is repeated along the axial direction, and the reduced-diameter outer peripheral surface portion has a concavo-convex shape along the axial direction. It is preferable to have a second reduced-diameter uneven portion that is repeated.

In this case, since the reduced-diameter inner peripheral surface portion and the reduced-diameter outer peripheral surface portion forming the reduced-diameter flow path portion each have a portion in which the concave-convex shape is repeated in the axial direction, pressure is applied to the liquid flowing inside the reduced-diameter flow path portion. It is possible to make it easier for changes and centrifugal forces to act. Further, the cross-sectional shape and cross-sectional area of the reduced diameter flow path portion change at each position in the axial direction. Therefore, microbubbles are more likely to be generated more stably in the liquid flowing through the reduced diameter flow path portion.

In the micro-bubble generating nozzle, the convex portion of the first reduced-diameter concavo-convex portion and the convex portion of the second reduced-diameter concavo-convex portion are arranged so as to face each other, and the concave portion of the first reduced-diameter concavo-convex portion and the concave portion. It is preferable that the recesses of the second reduced diameter uneven portion are arranged so as to face each other.

In this case, the cross-sectional shape and cross-sectional area of the reduced-diameter flow path portion change more greatly at each position in the axial direction. Therefore, microbubbles are more stably generated in the liquid flowing through the reduced diameter flow path portion.

In the micro-bubble generation nozzle, the inflow-side flow path portion is located at the end of the inflow-side flow path portion on the other side in the axial direction, and has a plurality of connection flow path portions connected to the micro-bubble generation flow path portion. It is preferable that the plurality of connection flow path portions are arranged at equal pitches in the circumferential direction around the central axis.

In this case, the liquid is evenly dispersed in the circumferential direction and flows into the microbubble generation flow path from the plurality of connection flow paths of the inflow side flow path. Therefore, the microbubbles can be generated evenly in the circumferential direction in the liquid flowing through the microbubble generation flow path portion.

In the micro-bubble generation nozzle, the outflow side flow path portion has a plurality of ejection flow path portions connected to the micro-bubble generation flow path portion, and the plurality of ejection flow path portions are in the circumferential direction around the central axis. It is preferable to arrange them at equal pitches.

In this case, the liquid is evenly dispersed and flows into the plurality of ejection flow paths from the microbubble generation flow path to the outflow side flow path. Therefore, the liquid containing the microbubbles can be evenly ejected in the circumferential direction from a plurality of ejection flow paths in a shower shape.

According to the micro-bubble generating nozzle of one aspect of the present invention, the outer shape can be kept compact while simplifying the structure.

It is a front view which shows the microbubble generation nozzle of one Embodiment of this invention. It is a side sectional view (vertical sectional view) which shows the II-II cross section of FIG. It is a back view which shows the microbubble generation nozzle of one Embodiment of this invention.

The micro-bubble generating nozzle 10 according to the embodiment of the present invention will be described with reference to the drawings.
The micro-bubble generating nozzle 10 of the present embodiment is provided in a pipe (piping) (not shown) through which a liquid flows. Specifically, the micro-bubble generating nozzle 10 is provided at the downstream end of the pipe, the faucet, the middle of the pipe (a portion other than the end of the pipe), and the like. The micro-bubble generating nozzle 10 is provided in a pipe through which water flows, for example, in a can manufacturing factory, and constitutes a part of the pipe. The micro-bubble generating nozzle 10 is made of, for example, resin.

As shown in FIGS. 1 to 3, the micro-bubble generating nozzle 10 has a central axis O, and has a tubular body 11 extending in the axial direction of the central axis O, an interior body 12, a connecting cylinder 13, and a seal member 14. And a flow path 15 formed inside the tubular body 11.
The liquid flows through the inside of the flow path 15 from one end of the cylinder 11 to the other end in the direction in which the central axis O of the cylinder 11 extends.

In the present embodiment, the direction in which the central axis O of the tubular body 11 extends is referred to as an axial direction. Of the axial directions, the upstream side of the liquid flowing in the flow path 15 of the tubular body 11 is referred to as one axial side, and the downstream side is referred to as the other axial direction. In this embodiment, one side in the axial direction is the right side in FIG. 2, and the other side in the axial direction is the left side in FIG.
The direction orthogonal to the central axis O is called the radial direction. Of the radial directions, the direction approaching the central axis O is called the radial inner side, and the direction away from the central axis O is called the radial outer side.
The direction of orbiting around the central axis O is called the circumferential direction.

The tubular body 11 has an outer cylinder 16, an upstream inner cylinder 17, a downstream inner cylinder 18, and a nozzle cap 19.
The outer cylinder 16 has a multi-stage tubular shape extending in the axial direction about the central axis O. The outer cylinder 16 has a small diameter cylinder portion 16a, a large diameter cylinder portion 16b, an annular plate portion 16c, and an annular recess 16e.

The small-diameter tubular portion 16a has a cylindrical shape extending in the axial direction. The small diameter cylinder portion 16a is located at one end of the outer cylinder 16 on one side in the axial direction. The small-diameter tubular portion 16a has a pipe connecting screw portion 16d on the outer peripheral surface of the small-diameter tubular portion 16a. The small diameter tubular portion 16a is connected to an end portion of a pipe (not shown) or the like by using a pipe connecting screw portion 16d.

The large-diameter tubular portion 16b has a cylindrical shape extending in the axial direction. The large-diameter cylinder portion 16b is located at a portion of the outer cylinder 16 other than the end portion on one side in the axial direction. The outer diameter of the large diameter tubular portion 16b is larger than the outer diameter of the small diameter tubular portion 16a. The inner diameter of the large diameter cylinder portion 16b is larger than the inner diameter of the small diameter cylinder portion 16a. The large-diameter tubular portion 16b has a female screw portion 16f at the end on the other side of the inner peripheral surface of the large-diameter tubular portion 16b in the axial direction.

The annular plate portion 16c has an annular plate shape centered on the central axis O, and a pair of plate surfaces face in the axial direction. Each plate surface of the annular plate portion 16c has a planar shape extending in a direction perpendicular to the central axis O. The inner peripheral portion of the annular plate portion 16c is connected to the end portion on the other side in the axial direction of the small diameter tubular portion 16a. The outer peripheral portion of the annular plate portion 16c is connected to the end portion on one side in the axial direction of the large diameter tubular portion 16b.

The annular recess 16e is arranged at a corner where the inner peripheral surface of the small diameter tubular portion 16a and the plate surface of the annular plate portion 16c facing the other side in the axial direction are connected. The annular recess 16e is located at the end of the inner peripheral surface of the small-diameter tubular portion 16a on the other side in the axial direction. The annular recess 16e is recessed radially outward from the inner peripheral surface of the small diameter tubular portion 16a and extends in the circumferential direction. The annular recess 16e is located at the inner end in the radial direction of the plate surface of the annular plate 16c facing the other side in the axial direction. The annular recess 16e is recessed in the axial direction from the plate surface of the annular plate portion 16c facing the other side in the axial direction, and extends in the circumferential direction. The annular recess 16e is a circular ring centered on the central axis O.

The upstream inner cylinder 17 has a tubular shape extending in the axial direction about the central axis O. The upstream inner cylinder 17 is arranged inside the outer cylinder 16. The upstream inner cylinder 17 is fitted in the large diameter cylinder portion 16b. The outer diameter of the upstream inner cylinder 17 is substantially constant along the axial direction. The inner diameter of the inner cylinder 17 on the upstream side gradually increases toward the other side in the axial direction. The end face of the upstream inner cylinder 17 facing one side in the axial direction is a flat surface extending in a direction perpendicular to the central axis O. The end surface of the upstream inner cylinder 17 facing one side in the axial direction comes into contact with the plate surface of the annular plate portion 16c facing the other side in the axial direction. The end face of the upstream inner cylinder 17 facing the other side in the axial direction is a flat surface extending in a direction perpendicular to the central axis O.

The upstream inner cylinder 17 has a diameter-expanded inner peripheral surface portion 20 on the inner peripheral surface of the upstream inner cylinder 17. That is, the tubular body 11 has a diameter-expanded inner peripheral surface portion 20 that forms a part of the inner peripheral surface of the tubular body 11. The enlarged inner peripheral surface portion 20 is arranged over the entire inner peripheral surface of the upstream inner cylinder 17. The diameter of the inner peripheral surface portion 20 is increased toward the other side in the axial direction.

The diameter-expanded inner peripheral surface portion 20 has a first diameter-expanded concave-convex portion 21 in which the concave-convex shape is repeated along the axial direction. The first diameter-expanded concave-convex portion 21 has a plurality of convex portions 21a and a plurality of concave portions 21b. In the cross-sectional view (longitudinal cross-sectional view) along the central axis O shown in FIG. 2, the convex portions 21a and the concave portions 21b are alternately arranged side by side on the first enlarged diameter uneven portion 21.

The downstream inner cylinder 18 has a tubular shape extending in the axial direction about the central axis O. The downstream inner cylinder 18 is arranged inside the outer cylinder 16. The downstream inner cylinder 18 is fitted in the large diameter cylinder portion 16b. The outer diameter of the downstream inner cylinder 18 is substantially constant along the axial direction. The inner diameter of the downstream inner cylinder 18 is gradually reduced toward the other side in the axial direction. The end face of the downstream inner cylinder 18 facing one side in the axial direction is a flat surface extending in a direction perpendicular to the central axis O. The end face of the downstream inner cylinder 18 facing one side in the axial direction comes into contact with the end face of the upstream inner cylinder 17 facing the other side in the axial direction. The end face of the downstream inner cylinder 18 facing the other side in the axial direction is a flat surface extending in a direction perpendicular to the central axis O.

The downstream inner cylinder 18 has a seal groove 18a on an end surface facing the other side in the axial direction. The seal groove 18a is recessed in the axial direction from the end face of the downstream inner cylinder 18 facing the other side in the axial direction, and extends in the circumferential direction. The seal groove 18a is a circular ring centered on the central axis O.

The downstream inner cylinder 18 has a reduced diameter inner peripheral surface portion 22 on the inner peripheral surface of the downstream inner cylinder 18. That is, the tubular body 11 has a reduced diameter inner peripheral surface portion 22 that forms a part of the inner peripheral surface of the tubular body 11. The reduced diameter inner peripheral surface portion 22 is arranged over the entire inner peripheral surface of the downstream inner cylinder 18. The reduced diameter inner peripheral surface portion 22 is arranged on the other side in the axial direction of the expanded inner peripheral surface portion 20, and the diameter is reduced toward the other side in the axial direction.

The reduced-diameter inner peripheral surface portion 22 has a first reduced-diameter uneven portion 23 in which the concave-convex shape is repeated along the axial direction. The first reduced-diameter concavo-convex portion 23 has a plurality of convex portions 23a and a plurality of concave portions 23b. In the vertical cross-sectional view shown in FIG. 2, the convex portions 23a and the concave portions 23b are alternately arranged side by side on the first reduced diameter uneven portion 23.

The nozzle cap 19 has a substantially columnar shape or a substantially plate shape centered on the central axis O. The nozzle cap 19 has a cap main body portion 19a, a protruding portion 19b, a fitting shaft 19c, and a ejection hole 19d.

The cap body 19a has a substantially disk shape centered on the central axis O. The plate surface of the cap body 19a facing one side in the axial direction is a flat surface extending in a direction perpendicular to the central axis O. The plate surface of the cap body 19a facing one side in the axial direction comes into contact with the end surface of the inner cylinder 18 on the downstream side facing the other side in the axial direction. The cap main body 19a has a male screw portion 19e on the outer peripheral surface of the cap main body 19a. The male threaded portion 19e is screwed to the female threaded portion 16f of the large diameter tubular portion 16b.

The projecting portion 19b projects from the plate surface of the cap body 19a facing the other side in the axial direction to the other side in the axial direction. The protruding portion 19b has a substantially conical shape centered on the central axis O and extends in the axial direction. The outer diameter of the protruding portion 19b decreases toward the other side in the axial direction. The protruding portion 19b protrudes to the other side in the axial direction from the opening on the other side in the axial direction of the ejection hole 19d.

The fitting shaft 19c projects from the plate surface of the cap body 19a facing one side in the axial direction to one side in the axial direction. The fitting shaft 19c has a columnar shape centered on the central shaft O and extends in the axial direction.

The ejection hole 19d penetrates the nozzle cap 19 in the axial direction. The ejection hole 19d has a circular hole shape. The ejection hole 19d has an opening on one side in the axial direction and an opening on the other side in the axial direction. The opening on one side of the ejection hole 19d in the axial direction is located radially outside the fitting shaft 19c. The opening on one side of the ejection hole 19d in the axial direction expands in diameter toward one side in the axial direction. The opening on the other side of the ejection hole 19d in the axial direction is located radially outside the protrusion 19b.
A plurality of ejection holes 19d are provided in the nozzle cap 19. The plurality of ejection holes 19d are arranged at equal pitches in the circumferential direction around the central axis O. In this embodiment, 12 ejection holes 19d are arranged at equal intervals in the circumferential direction.

The interior body 12 is arranged inside the tubular body 11. The interior body 12 is arranged inside the upstream inner cylinder 17 and the downstream inner cylinder 18 in the radial direction. The interior body 12 has a substantially columnar shape or a substantially plate shape centered on the central axis O. The outer diameter of the interior body 12 increases from both end portions in the axial direction toward the center portion. The end face of the interior body 12 facing one side in the axial direction is a flat surface extending in a direction perpendicular to the central axis O. The end face of the interior body 12 facing the other side in the axial direction is a flat surface extending in a direction perpendicular to the central axis O. The end face of the interior body 12 facing the other side in the axial direction comes into contact with the plate surface of the cap body 19a facing the other side in the axial direction.

The interior body 12 has an expanded outer peripheral surface portion 24, a reduced diameter outer peripheral surface portion 25, a protruding portion 12a, a fitting hole 12b, and an annular groove portion 12c.
The enlarged diameter outer peripheral surface portion 24 constitutes a portion on one side in the axial direction of the outer peripheral surface of the interior body 12. That is, the enlarged outer peripheral surface portion 24 constitutes a part of the outer peripheral surface of the interior body 12. The enlarged diameter outer peripheral surface portion 24 is arranged on one side of the outer peripheral surface of the interior body 12 in the axial direction over the entire circumference in the circumferential direction. The diameter of the outer peripheral surface portion 24 is increased toward the other side in the axial direction. The enlarged diameter outer peripheral surface portion 24 is arranged so as to face the enlarged diameter inner peripheral surface portion 20 with a gap.

The diameter-expanded outer peripheral surface portion 24 has a second diameter-expanded concave-convex portion 26 in which the concave-convex shape is repeated along the axial direction. The second diameter-expanded concave-convex portion 26 has a plurality of convex portions 26a and a plurality of concave portions 26b. In the vertical cross-sectional view shown in FIG. 2, the convex portions 26a and the concave portions 26b are alternately arranged side by side on the second enlarged diameter uneven portion 26.
The convex portion 21a of the first diameter-expanded concave-convex portion 21 and the convex portion 26a of the second diameter-expanded concave-convex portion 26 are arranged so as to face each other. The recess 21b of the first diameter-expanded uneven portion 21 and the recess 26b of the second diameter-expanded uneven portion 26 are arranged so as to face each other.

The reduced diameter outer peripheral surface portion 25 constitutes a portion of the outer peripheral surface of the interior body 12 on the other side in the axial direction. That is, the reduced diameter outer peripheral surface portion 25 constitutes a part of the outer peripheral surface of the interior body 12. The reduced diameter outer peripheral surface portion 25 is arranged on the other side of the outer peripheral surface of the interior body 12 in the axial direction over the entire circumference in the circumferential direction. The reduced diameter outer peripheral surface portion 25 is arranged on the other side in the axial direction of the expanded outer peripheral surface portion 24, and the diameter is reduced toward the other side in the axial direction. The reduced diameter outer peripheral surface portion 25 is arranged to face the reduced diameter inner peripheral surface portion 22 with a gap.

The reduced-diameter outer peripheral surface portion 25 has a second reduced-diameter concavo-convex portion 27 in which the concave-convex shape is repeated along the axial direction. The second reduced-diameter concavo-convex portion 27 has a plurality of convex portions 27a and a plurality of concave portions 27b. In the vertical cross-sectional view shown in FIG. 2, the convex portions 27a and the concave portions 27b are alternately arranged side by side on the second reduced diameter uneven portion 27.
The convex portion 23a of the first reduced-diameter concavo-convex portion 23 and the convex portion 27a of the second reduced-diameter concavo-convex portion 27 are arranged so as to face each other. The recess 23b of the first reduced-diameter concavo-convex portion 23 and the recess 27b of the second reduced-diameter concavo-convex portion 27 are arranged so as to face each other.

The protruding portion 12a projects from the end surface of the interior body 12 facing one side in the axial direction to one side in the axial direction. The protrusion 12a has a substantially conical shape centered on the central axis O, and extends in the axial direction. The outer diameter of the protruding portion 12a becomes smaller toward one side in the axial direction.

The fitting hole 12b is recessed from the end face of the interior body 12 facing the other side in the axial direction to one side in the axial direction. The fitting hole 12b has a circular hole shape centered on the central axis O and extends in the axial direction. The fitting shaft 19c is fitted in the fitting hole 12b.

The annular groove portion 12c is recessed from the end surface of the interior body 12 facing one side in the axial direction to the other side in the axial direction, and extends in the circumferential direction. The annular groove portion 12c is a circular ring centered on the central axis O. The annular groove portion 12c is located radially outside the protrusion 12a. The annular groove portion 12c is located on the other side of the annular recess 16e in the axial direction and faces the annular recess 16e at a distance in the axial direction.

The connecting cylinder 13 has a cylindrical shape extending in the axial direction about the central axis O. The connecting cylinder 13 connects the cylinder 11 and the interior body 12. One end of the connecting cylinder 13 in the axial direction is fitted in the annular recess 16e. In the present embodiment, the end portion on one side in the axial direction of the connecting cylinder 13 is also fitted to the inside in the radial direction of the end portion on one side in the axial direction of the upstream inner cylinder 17. The end of the connecting cylinder 13 on the other side in the axial direction fits into the annular groove portion 12c.

The connecting cylinder 13 has a connecting hole 13a that penetrates the peripheral wall of the connecting cylinder 13 in the radial direction. A plurality of connection holes 13a are provided in the connecting cylinder 13. The plurality of connection holes 13a are arranged at equal pitches in the circumferential direction around the central axis O. In the present embodiment, 12 connection holes 13a are arranged at equal intervals in the circumferential direction.

The seal member 14 has a circular ring shape centered on the central axis O. The seal member 14 is an elastic member such as an O-ring. The seal member 14 is arranged in the seal groove 18a. The seal member 14 comes into contact with the plate surface of the cap body 19a facing one side in the axial direction.

The flow path 15 is arranged inside the tubular body 11 and penetrates the tubular body 11 in the axial direction. Liquid flows into the flow path 15 from a tube (not shown). The liquid flows in the flow path 15 from one end in the axial direction to the other end in the axial direction.
The flow path 15 includes an inflow side flow path portion 30 located at one end of the tubular body 11 in the axial direction, an outflow side flow path portion 31 located at the other end of the tubular body 11 in the axial direction, and a shaft. It has a microbubble generation flow path portion 32 that is located between the inflow side flow path portion 30 and the outflow side flow path portion 31 in the direction and communicates with the inflow side flow path portion 30 and the outflow side flow path portion 31.

The inflow side flow path portion 30 is formed by an inner peripheral surface of the small diameter cylinder portion 16a, an inner peripheral surface of the connecting cylinder 13 and a connection hole 13a, and an end surface and a protrusion 12a facing one side in the axial direction of the interior body 12. Will be done. The inflow side flow path portion 30 has a plurality of connection flow path portions 30a located at the end on the other side in the axial direction of the inflow side flow path portion 30 and connected to the microbubble generation flow path portion 32. Each connection flow path portion 30a is formed by each connection hole 13a. The plurality of connection flow path portions 30a are arranged at equal pitches in the circumferential direction around the central axis O. In this embodiment, 12 connecting flow path portions 30a are arranged at equal intervals in the circumferential direction.

The outflow side flow path portion 31 has a plurality of ejection flow path portions 31a connected to the microbubble generation flow path portion 32. Each ejection flow path portion 31a is formed by each ejection hole 19d. The plurality of ejection flow path portions 31a are arranged at equal pitches in the circumferential direction around the central axis O. In the present embodiment, twelve ejection flow path portions 31a are arranged at equal intervals in the circumferential direction.

The micro-bubble generation flow path portion 32 is formed by an inner peripheral surface of the tubular body 11 and an outer peripheral surface of the interior body 12. The micro-bubble generation flow path portion 32 is an annular shape extending in the circumferential direction around the central axis O. The micro-bubble generation flow path portion 32 is arranged between the upstream inner cylinder 17, the downstream inner cylinder 18, and the interior body 12 in the radial direction.
The micro-bubble generation flow path portion 32 has a diameter-expanded flow path portion 32a and a diameter-reduced flow path portion 32b.

The diameter-expanded flow path portion 32a expands in diameter toward the other side in the axial direction. The enlarged diameter flow path portion 32a is located on one side in the axial direction of the micro bubble generation flow path portion 32. The diameter-expanded flow path portion 32a is formed by the diameter-expanded inner peripheral surface portion 20 and the diameter-expanded outer peripheral surface portion 24.

The diameter-reduced flow path portion 32b is arranged on the other side of the diameter-expanded flow path portion 32a in the axial direction, communicates with the diameter-expanded flow path portion 32a, and is reduced in diameter toward the other side in the axial direction. The reduced diameter flow path portion 32b is located on the other side in the axial direction of the micro bubble generation flow path portion 32. The reduced diameter flow path portion 32b is formed by a reduced diameter inner peripheral surface portion 22 and a reduced diameter outer peripheral surface portion 25.

In the micro-bubble generation nozzle 10 of the present embodiment described above, the micro-bubble generation flow path portion 32 has a diameter-expanded flow path portion 32a and a diameter-reduced flow path portion 32b. Therefore, when the liquid flows through the micro-bubble generation flow path portion 32 from the diameter-expanded flow path portion 32a to the diameter-reduced flow path portion 32b, the pressure of the liquid in the flow path 15 changes or centrifugal force acts on the liquid. Then, microbubbles are generated in the liquid.

In the present embodiment, microbubbles can be generated while simplifying the structure without forming the flow path in a spiral shape as in the conventional structure described in, for example, Patent Document 1 (Patent No. 6312768). Therefore, it is easy to manufacture the micro-bubble generating nozzle 10. Further, as compared with the conventional structure, in the present embodiment, it is easy to keep the total length in the axial direction particularly small. Therefore, the outer shape of the micro-bubble generating nozzle 10 can be suppressed to be compact.

Further, in the present embodiment, the microbubble generation flow path portion 32 is an annular shape extending in the circumferential direction around the central axis O.
In this case, the structure of the micro-bubble generation flow path portion 32 can be further simplified, and the production of the micro-bubble generation nozzle 10 becomes easier.

Further, in the present embodiment, the enlarged diameter flow path portion 32a is formed by the enlarged diameter inner peripheral surface portion 20 and the enlarged diameter outer peripheral surface portion 24, and the reduced diameter flow path portion 32b is the reduced diameter inner peripheral surface portion 22 and the reduced diameter outer peripheral surface portion 24. Formed by 25.
In this case, since the liquid flows from the expanded flow path portion 32a to the reduced diameter flow path portion 32b, it is possible to stably act on the liquid in the flow path 15 with a change in pressure and centrifugal force, and microbubbles can be formed in the liquid. Occurs more stably.

Further, in the present embodiment, the diameter-expanded inner peripheral surface portion 20 has a first diameter-expanded concavo-convex portion 21 in which the concave-convex shape is repeated along the axial direction, and the diameter-expanded outer peripheral surface portion 24 has a concave-convex shape along the axial direction. It has a second enlarged uneven portion 26 that is repeated.
That is, since the enlarged inner peripheral surface portion 20 and the enlarged outer peripheral surface portion 24 forming the enlarged diameter flow path portion 32a each have a portion in which the uneven shape is repeated in the axial direction, the liquid flowing inside the enlarged diameter flow path portion 32a can be used. , It is possible to make it easier for pressure changes and centrifugal force to act. Further, the cross-sectional shape and cross-sectional area of the enlarged diameter flow path portion 32a change at each position in the axial direction. Therefore, microbubbles are more likely to be generated more stably in the liquid flowing through the diameter-expanded flow path portion 32a.

Further, in the present embodiment, the convex portion 21a of the first enlarged diameter concavo-convex portion 21 and the convex portion 26a of the second enlarged diameter concavo-convex portion 26 are arranged so as to face each other, and the concave portion 21b of the first enlarged diameter concavo-convex portion 21. And the recess 26b of the second diameter-expanded uneven portion 26 are arranged so as to face each other.
In this case, the cross-sectional shape and cross-sectional area of the enlarged diameter flow path portion 32a change more greatly at each position in the axial direction. Therefore, microbubbles are more stably generated in the liquid flowing through the enlarged diameter flow path portion 32a.

Further, in the present embodiment, the reduced-diameter inner peripheral surface portion 22 has a first reduced-diameter concavo-convex portion 23 in which the concave-convex shape is repeated along the axial direction, and the reduced-diameter outer peripheral surface portion 25 has a concave-convex shape along the axial direction. It has a second reduced-diameter uneven portion 27 that is repeated.
That is, since the reduced-diameter inner peripheral surface portion 22 and the reduced-diameter outer peripheral surface portion 25 forming the reduced-diameter flow path portion 32b each have a portion in which the concave-convex shape is repeated in the axial direction, the liquid flowing inside the reduced-diameter flow path portion 32b , It is possible to make it easier for pressure changes and centrifugal force to act. Further, the cross-sectional shape and cross-sectional area of the reduced diameter flow path portion 32b change at each position in the axial direction. Therefore, microbubbles are more likely to be generated more stably in the liquid flowing through the reduced diameter flow path portion 32b.

Further, in the present embodiment, the convex portion 23a of the first reduced-diameter concavo-convex portion 23 and the convex portion 27a of the second reduced-diameter concavo-convex portion 27 are arranged so as to face each other, and the concave portion 23b of the first reduced-diameter concavo-convex portion 23. And the recess 27b of the second diameter-reduced uneven portion 27 are arranged so as to face each other.
In this case, the cross-sectional shape and cross-sectional area of the reduced-diameter flow path portion 32b change more greatly at each position in the axial direction. Therefore, microbubbles are more stably generated in the liquid flowing through the reduced diameter flow path portion 32b.

Further, in the present embodiment, the plurality of connecting flow path portions 30a of the inflow side flow path portion 30 are arranged at equal pitches in the circumferential direction around the central axis O.
In this case, the liquid is evenly dispersed in the circumferential direction and flows into the microbubble generation flow path portion 32 from the plurality of connection flow path portions 30a of the inflow side flow path portion 30. Therefore, the microbubbles can be uniformly generated in the circumferential direction in the liquid flowing through the microbubble generation flow path portion 32.

Further, in the present embodiment, the plurality of ejection flow path portions 31a of the outflow side flow path portion 31 are arranged at equal pitches in the circumferential direction around the central axis O.
In this case, the liquid is evenly dispersed and flows in the circumferential direction from the micro-bubble generation flow path portion 32 to the plurality of ejection flow path portions 31a of the outflow side flow path portion 31. Therefore, the liquid containing the microbubbles can be evenly ejected from the plurality of ejection flow paths 31a in a shower shape in the circumferential direction.

The present invention is not limited to the above-described embodiment, and the configuration can be changed without departing from the spirit of the present invention, for example, as described below.

In the above-described embodiment, an example in which the liquid flows out in a shower shape from the plurality of ejection flow paths 31a of the outflow side flow path 31 is given, but the present invention is not limited to this. For example, when the micro-bubble generating nozzle 10 is provided in the middle of the pipe, the configuration of the inflow side flow path portion 30 may be reversed in the axial direction for the outflow side flow path portion 31.

In addition, each configuration (component) described in the above-described embodiments, modifications, and notes may be combined as long as it does not deviate from the gist of the present invention, and addition, omission, replacement, and other configurations may be added. It can be changed. Further, the present invention is not limited by the above-described embodiments, but is limited only by the scope of claims.

According to the micro-bubble generating nozzle of the present invention, the outer shape can be kept compact while simplifying the structure. Therefore, it has industrial applicability.

10 ... Micro bubble generation nozzle, 11 ... Cylinder body, 12 ... Interior body, 15 ... Flow path, 20 ... Diameter-expanded inner peripheral surface portion, 21 ... First diameter-expanded uneven portion, 21a, 23a, 26a, 27a ... Convex portion, 21b, 23b, 26b, 27b ... Recessed, 22 ... Reduced inner peripheral surface, 23 ... First reduced diameter unevenness, 24 ... Expanded outer peripheral surface, 25 ... Reduced outer peripheral surface, 26 ... Second enlarged uneven surface, 27 ... 2nd reduced diameter uneven portion, 30 ... Inflow side flow path portion, 30a ... Connection flow path portion, 31 ... Outflow side flow path portion, 31a ... Ejection flow path portion, 32 ... Micro bubble generation flow path portion, 32a ... Expanded diameter flow path, 32b ... Reduced diameter flow path, O ... Central axis

Claims (9)

A micro-bubble generating nozzle provided in a pipe through which liquid flows.
A cylinder having a central axis and extending in the axial direction of the central axis,
An interior body arranged inside the cylinder and
A flow path formed inside the cylinder is provided.
The flow path is
An inflow side flow path portion located at one end of the cylinder in the axial direction and
The outflow side flow path portion located at the end on the other side in the axial direction of the cylinder,
It has a microbubble generation flow path portion that is located between the inflow side flow path portion and the outflow side flow path portion in the axial direction and communicates with the inflow side flow path portion and the outflow side flow path portion. ,
The micro-bubble generation flow path portion is formed by an inner peripheral surface of the tubular body and an outer peripheral surface of the interior body.
The micro-bubble generation flow path portion is
A diameter-expanded flow path that increases in diameter toward the other side in the axial direction,
It has a diameter-reduced flow path portion that is arranged on the other side in the axial direction of the diameter-expanded flow path portion, communicates with the diameter-expanded flow path portion, and decreases in diameter toward the other side in the axial direction.
Micro bubble generation nozzle. The micro-bubble generation flow path portion is an annular shape extending in the circumferential direction around the central axis.
The microbubble generating nozzle according to claim 1. The cylinder is
A diameter-expanded inner peripheral surface portion that forms a part of the inner peripheral surface of the cylinder and expands in diameter toward the other side in the axial direction.
It has a diameter-reduced inner peripheral surface portion that constitutes a part of the inner peripheral surface of the tubular body, is arranged on the other side in the axial direction of the enlarged diameter inner peripheral surface portion, and is reduced in diameter toward the other side in the axial direction.
The interior body is
A diameter-expanded outer peripheral surface portion that forms a part of the outer peripheral surface of the interior body and expands in diameter toward the other side in the axial direction.
It has a reduced outer peripheral surface portion that constitutes a part of the outer peripheral surface of the interior body, is arranged on the other side in the axial direction of the enlarged outer peripheral surface portion, and is reduced in diameter toward the other side in the axial direction.
The enlarged diameter flow path portion is formed by the enlarged inner peripheral surface portion and the enlarged outer peripheral surface portion.
The reduced diameter flow path portion is formed by the reduced diameter inner peripheral surface portion and the reduced diameter outer peripheral surface portion.
The microbubble generating nozzle according to claim 1 or 2. The enlarged-diameter inner peripheral surface portion has a first enlarged-diameter concavo-convex portion in which a concavo-convex shape is repeated along the axial direction.
The diameter-expanded outer peripheral surface portion has a second diameter-expanded uneven portion in which a concave-convex shape is repeated along the axial direction.
The microbubble generating nozzle according to claim 3. The convex portion of the first diameter-expanded concavo-convex portion and the convex portion of the second diameter-expanded concavo-convex portion are arranged so as to face each other.
The concave portion of the first enlarged diameter uneven portion and the concave portion of the second enlarged diameter uneven portion are arranged so as to face each other.
The microbubble generating nozzle according to claim 4. The reduced-diameter inner peripheral surface portion has a first reduced-diameter concavo-convex portion in which a concavo-convex shape is repeated along the axial direction.
The reduced-diameter outer peripheral surface portion has a second reduced-diameter uneven portion in which the concave-convex shape is repeated along the axial direction.
The microbubble generating nozzle according to any one of claims 3 to 5. The convex portion of the first reduced-diameter concavo-convex portion and the convex portion of the second reduced-diameter concavo-convex portion are arranged so as to face each other.
The concave portion of the first reduced-diameter uneven portion and the concave portion of the second reduced-diameter uneven portion are arranged so as to face each other.
The microbubble generating nozzle according to claim 6. The inflow side flow path portion has a plurality of connection flow path portions located at the end of the inflow side flow path portion on the other side in the axial direction and connected to the microbubble generation flow path portion.
The plurality of connection flow paths are arranged at equal pitches in the circumferential direction around the central axis.
The microbubble generating nozzle according to any one of claims 1 to 7. The outflow side flow path portion has a plurality of ejection flow path portions connected to the micro bubble generation flow path portion.
The plurality of ejection flow paths are arranged at equal pitches in the circumferential direction around the central axis.
The microbubble generating nozzle according to any one of claims 1 to 8.

Images