JP2017225961A - Fine bubble generation nozzle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fine bubble generation nozzle having a significantly enhanced generation rate of fine bubbles at micro- and nano-levels.SOLUTION: The present invention provides a fine bubble generation nozzle 1 comprising a flow passage 11 into which liquid L flows, a turning turbulent flow generating portion 40 for turning the liquid L in the flow passage 11 and generating a turbulent flow in the turning liquid L, and an injection port 31 for injecting the turned liquid L. A turning flow passage 43 of the turning turbulent flow generating portion 40 is formed in a step shape. Since the turbulent flow is generated in the turning liquid L by such a configuration, a large quantity of vortexes are generated. Thus, fine bubbles of micro-level and nano-level are generated in large quantities by injecting the turning liquid L that contains a large quantity of vortexes.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a fine bubble generating nozzle that generates fine bubbles by a swirling flow method.

  Conventionally, as an example of a swirl flow type fine bubble generating nozzle, there is one disclosed in Patent Document 1. A conventional fine bubble generating nozzle has an inlet for introducing liquid at one end and a gas from an intake port opened on the peripheral wall of the casing body into a cylindrical casing body having an outlet for discharging liquid at the other end. The gas-liquid mixing part which introduces and mixes with the liquid and the swirl flow formation part which makes a gas-liquid mixture turn into a swirl flow are provided. The gas-liquid mixture that has turned into a swirl is subjected to a force that is repelled sideways by the influence of strong rotation when released, and the gas is divided by the action of twisting and pulling as the vortex breaks down. By being divided in this manner, fine bubbles are generated.

Japanese Patent Publication No. 20 07-7 1 3 4 3

  However, the conventional fine bubble generating nozzle has a low generation rate of micro-level (several tens to several hundreds of μm) and nano-level (less than 1 μm) bubbles, and cannot be utilized in industrial fields where bubbles below the micro level are required. Had.

  The present invention has been created in view of the above problems, and an object of the present invention is to provide a fine bubble generating nozzle that greatly increases the generation ratio of micro-level and nano-level fine bubbles.

  Microbubble generation comprising: a flow channel into which liquid flows, a swirling turbulent flow generating unit that swirls the liquid in the flow channel and generates turbulent flow in the swirling liquid, and an ejection port that ejects the swirling liquid By nozzle.

  In addition, it is preferable that the swirl turbulent flow generation part is a core disposed inside the flow path, and a swirl flow path is formed on the surface thereof.

  In addition, it is preferable that the said core is a substantially cone shape, and the turning flow path is formed in the side surface and the bottom face, and it arrange | positions inside the flow path toward the upstream.

  The inner surface of the swirling channel is preferably stepped.

  In addition, it is preferable that a bubble cutting part is connected to the ejection port, and the bubble cutting part has a plurality of holes through which the liquid ejected from the ejection port can pass.

  ADVANTAGE OF THE INVENTION According to this invention, the micro bubble production | generation nozzle which can generate | occur | produce a large quantity of micro level and nano level micro bubbles can be provided.

It is a longitudinal cross-sectional view of the front view of the fine bubble generation | occurrence | production nozzle which showed embodiment of this invention. It is a top view of the core of a fine bubble generating nozzle showing an embodiment of the present invention. It is a perspective view from the plane side of the core of the fine bubble generating nozzle showing the embodiment of the present invention. It is a bottom view of a core of a fine bubble generating nozzle showing an embodiment of the present invention. It is a perspective view from the bottom face side of the core of the fine bubble generating nozzle showing the embodiment of the present invention. It is a longitudinal cross-sectional view of the front view which shows the state which removed the core of the fine bubble generation | occurrence | production nozzle which showed embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In FIG. 1, reference numeral 1 denotes a fine bubble generating nozzle having a nozzle body 10 in which a flow path 11 communicating from an inlet 21 to an injection port 31 is formed. The nozzle body 10 is formed by connecting an inflow pipe 20 and an injection pipe 30.

  The inflow pipe 20 includes an inlet 21 and a connection port 22 at both ends, and an inflow chamber 23 whose inner diameter gradually becomes smaller from the inflow port 21 toward the connection port 22 is formed.

  The injection pipe 30 is provided with a connection port 32 and an injection port 31 at both ends. The inner diameter gradually increases from the connection port 32 toward the injection port 31 and gradually increases from the middle. A swirl chamber 33 having a diameter is formed.

  The flow path 11 connects the connection port 21 of the inflow pipe 20 and the connection port 31 of the injection pipe 30 so that the inflow chamber 23 and the swirl chamber 33 communicate with each other. Is ejected from the ejection port 31. The fluid L is a pressurized solution in which a gas such as oxygen or ozone is sufficiently dissolved. Further, the nozzle body 10 has an intake hole 2 that intersects the flow path 11, and is configured to mix the gas G with the liquid L before flowing into the swirl chamber 33.

  Inside the swirl chamber 33 of the injection pipe 30, a core 40 is disposed as a swirl turbulence generator. The core 40 is formed in a substantially conical shape (specifically, a chestnut shape), and the side surface 41 is formed along a portion 33 a that gradually increases in diameter on the inner wall of the swirl chamber 33. In addition, the bottom surface 44 is formed along a portion 33 b that gradually decreases in diameter on the inner wall of the swirl chamber 33. For this reason, the core 40 is disposed so that the top portion 42 faces the upstream side and is fitted into the inside of the swirl chamber 33.

  As shown in FIGS. 2 and 3, in a plan view, an upstream blade portion 43 d that changes the direction clockwise at a predetermined turning angle protrudes from the side surface 41 of the core 40. Six blade portions 43a are arranged at equal intervals. And the upstream turning flow path 43 is formed of the clearance gap between the adjacent upstream blade | wing parts 43d.

  The upstream swirl flow path 43 includes a bottom surface 43b, an inner side surface 43c, and an outer side surface 43d, and when the core 40 is disposed inside the swirl chamber 33, the upstream swirl facing the bottom surface 43b. The opening portion of the flow path 43 is closed by the inner wall 33 a of the swirl chamber 33 of the injection pipe 30. In short, the inner surface of the upstream-side swirl flow path 43 is constituted by four surfaces: a bottom surface 43 b, an inner side surface 43 c, an outer side surface 43 d, and an inner wall 33 a of the swirl chamber 33. For this reason, the liquid L flows through the upstream swirling flow path 43 as shown by a two-dot chain line in FIG. 3, and the upstream swirling flow path 43 swirls with respect to the liquid L flowing through the inflow chamber 23. It is configured to generate a velocity component in the direction.

  Further, among the inner surface of the upstream swirl flow path 43, the bottom surface 43b and the outer side surface 43d are formed in a step shape having a plurality of step portions so as to have a step with respect to the direction in which the liquid L flows. The vortex is generated by generating a turbulent flow in the liquid L flowing through. Note that the inner side surface 43c of the upstream side swirl passage is located inside the swirl direction of the liquid L, and therefore has a low flow rate and cannot be expected to generate a vortex. Therefore, the inner side surface 43c is formed in a step shape in consideration of the machining efficiency of the core. Absent.

  As shown in FIG. 6, the inner wall 33a of the swirl chamber 33 of the injection pipe 30 (that is, the upper surface of the upstream swirl flow path 43), among the inner surfaces of the upstream swirl flow path 43, has a bottom surface 43b and an outer side surface 43d. Similarly, it is formed in a step shape having a plurality of step portions so as to have a step in the flowing direction of the liquid L.

  Further, as shown in FIG. 3, the inlet A and outlet B of the upstream side swirl flow path 43 are such that the groove depth of the inlet A is deeper than the groove depth of the outlet B, and the opening area of the inlet A is the opening of the outlet B. It is comprised so that it may become larger than an area.

  As shown in FIGS. 4 and 5, when viewed from the bottom, on the bottom surface 44 of the core 40, downstream blade portions 45a and 45b that project clockwise at a predetermined turning angle project. The downstream blade portion 45a and the downstream blade portion 45b have different turning angles, and the downstream blade portions 45a and 45b having different turning angles are alternately arranged at predetermined intervals. A downstream swirl flow path 45 as a flow path for the liquid L is formed by a gap between the adjacent downstream blade section 45a and the downstream blade section 45b.

  When the core 40 is disposed inside the swirl chamber 33, the downstream swirl passage 45 is configured such that the opening portion facing the bottom surface 44 is closed by the inner wall 33 b of the swirl chamber 33. For this reason, the liquid L flows through the downstream swirl flow path 45 as shown by the two-dot chain line in FIG. 5, and the downstream swirl flow path 45 flows into the liquid L flowing through the upstream swirl flow path 43. On the other hand, it is further configured to generate a velocity component in the turning direction.

  In addition, a recess 46 is formed in the central portion of the bottom surface 44 of the core 40, and a negative pressure is generated by the recess 46 so that the turning force of the liquid L is increased. Thus, the upstream swirl flow path 43 formed on the side surface 41 of the core 40 and the downstream swirl flow path 45 formed on the bottom surface 44 of the core 40 cause a swirl flow on the surface of the core 40. A road is constructed.

  As shown in FIG. 1, a bubble cutting part 50 is connected to the injection port. The bubble cutting part 50 has a cylindrical shape with openings at both ends, and a plurality of holes are formed in the side surface. The liquid L ejected from the ejection port 31 passes through the inside of the bubble cutting unit 50, but since the one end of the bubble cutting unit 50 is closed by the lid 51, the liquid L is the side surface of the bubble cutting unit 50. It flows out through the hole formed in the outside. And it ejects from the discharge port 52 drilled in the cover body 51.

  The basic operation of the nozzle for generating fine bubbles as described above will be described.

  The liquid L flowing in from the inflow port 21 flows through the inflow chamber 23, and the air G is mixed from the intake port 2 in the vicinity of the connection portion between the inflow tube 20 and the injection tube 30. The liquid L that has flowed into the swirl chamber 23 flows into the upstream swirl flow path 43 and the downstream swirl flow 45 to become a swirl flow. Here, since the inner surface of the upstream side swirl flow path 43 has a step shape, a turbulent flow is generated. At this time, a large amount of vortices are generated. Moreover, since the cross-sectional area of the upstream-side swirl passage 43 gradually decreases from the inlet A to the outlet B, the size of the generated vortex becomes very small. Such a configuration makes it possible to generate a swirling flow containing a large amount of small vortices. Thus, the liquid L that has become a swirling flow is ejected from the ejection port 31. At this time, when it is released, it receives a force that is blown sideways by the influence of strong rotation, and the gas is divided by the action of twisting and pulling as the vortex breaks down. By dividing, fine bubbles are generated. Furthermore, since the bubble cutting part 50 is connected to the injection port 31, the fine bubbles are further refined. Thus, by ejecting the liquid L that swirls in a state including a large amount of vortices, a large amount of micro-level and nano-level fine bubbles are generated.

  In addition, the inner surface of the upstream swirl flow path 43 is not limited to a step shape, and may be a configuration including a timple shape having a plurality of depressions and a plurality of protrusions, for example. Even with such a configuration, it is possible to generate a turbulent flow in the liquid L flowing through the upstream-side swirl passage 43 to generate a large amount of vortex. Moreover, the surface formed in a step shape on the inner surface of the upstream-side swirl passage 43 is not limited to the above-described embodiment, and any one of the four surfaces may be formed in a step shape.

DESCRIPTION OF SYMBOLS 1 Fine bubble generation | occurrence | production nozzle 10 Nozzle main body 11 Flow path 21 Inlet 31 Injection port 40 Core (rotating turbulent flow generation part)
43 Upstream swirl flow path 45 Downstream swirl flow path 50 Bubble cutting part

Claims (5)

A flow path for the liquid to flow in;
A swirl turbulence generator that swirls the liquid in the flow path and generates turbulence in the swirling liquid;
An ejection port for ejecting the swirling liquid;
A fine bubble generating nozzle comprising:   2. The fine bubble generating nozzle according to claim 1, wherein the swirling turbulent flow generation portion is a core disposed inside a flow path, and a swirling flow path is formed on a surface thereof.   The core has a substantially conical shape, and a swirl flow path is formed on a side surface and a bottom surface of the core, and the core is disposed inside the flow path with the top portion facing the upstream side. 2. A fine bubble generating nozzle according to 2.   4. The fine bubble generating nozzle according to claim 2, wherein an inner surface of the swirl passage has a step shape. 5. The bubble cutting part is connected to the injection port, and the bubble cutting part has a plurality of holes through which the liquid injected from the injection port can pass. Fine bubble generating nozzle.

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