JP2019141828A - Fine bubble generation nozzle - Google Patents

Abstract

To provide a fine bubble generation nozzle for largely enhancing a generation quantity of fine bubbles of a micro level and a nano level.SOLUTION: The present invention is by a fine bubble generation nozzle 1 having a nozzle body 10 forming a bottomed cylindrical shape and discharging a gas-liquid mixed body L from a derivation port 21 bored in this bottom part 11, a core 40 arranged in the nozzle body and having a flow passage on an outer surface for turning the gas-liquid mixed body flowing in the nozzle body, a recessed part 49 provided in a bottom part 47 of the core opposed to the bottom part of the nozzle body and a shear part 60 for generating a fine bubble by shearing the gas-liquid mixed body discharged from the derivation port of the nozzle body. Since negative pressure is generated in a place provided with the recessed part, a turbulent flow is generated in the gas-liquid mixed body, so that the content of the bubble is enhanced. The fine bubble generated by shearing such gas-liquid mixed body includes much of the fine bubble of a micro level and a nano level.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.

  Further, as shown in Patent Document 2, it is known that in a swirling flow type fine bubble generating nozzle, the flow velocity of swirling flow is increased as a method of increasing the generation amount of micro bubbles of nano and nano levels.

JP 2007-21343 A JP 2014-28340 A

  However, as a matter of fact, in the swirl flow type fine bubble generating nozzle, when the flow velocity of the swirl flow is increased, the generation amount of micro and nano level fine bubbles cannot be significantly increased.

  The present invention was created in view of the above problems, and an object of the present invention is to provide a fine bubble generating nozzle in which the generation amount of fine bubbles at the micro level and nano level is increased.

  A nozzle body that has a bottomed cylindrical shape and discharges a gas-liquid mixture from an outlet port formed in the bottom, and a gas-liquid mixture that is arranged in the nozzle body and flows in the nozzle body Microbubbles are generated by shearing the core having the flow path on the outer surface, the recess provided at the bottom of the core facing the bottom of the nozzle body, and the gas-liquid mixture discharged from the outlet of the nozzle body. By a fine bubble generation nozzle provided with a shearing part.

  In addition, it is preferable that the recessed part provided in the bottom part of the core is located in the location remove | deviated from the center part of the said bottom part.

  According to this invention, the recessed part is provided in the point where a gas-liquid mixture joins. Since a negative pressure is generated by the recess, a turbulent flow is generated in the gas-liquid mixture, so that the bubble content is increased. The fine bubbles generated by shearing such a gas-liquid mixture contain many micro-level and nano-level fine bubbles. Moreover, since the amount of turbulent flow is increased compared to the case where the concave portion is provided in the central portion by providing the concave portion away from the central portion of the core, the micro-level and nano-level fine bubbles are provided. Will contain more of.

It is a longitudinal cross-sectional view of the front view in the fine bubble generating nozzle of this invention. It is a perspective view from the plane side showing the internal structure of the swirl chamber in the fine bubble generating nozzle of the present invention. It is a perspective view from the bottom side showing the internal structure of the swirl chamber in the fine bubble generating nozzle of the present invention. It is a perspective view from the plane side which shows the internal structure of the shear chamber in the fine bubble generation | occurrence | production nozzle 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, which has a bottomed cylindrical nozzle body 10. Inside the nozzle body 10, an introduction chamber 20 for introducing the gas-liquid mixture L, a swirl chamber 30 for turning the gas-liquid mixture L in a swirl flow, and the gas-liquid mixture L in a swirl flow are sheared. A shear chamber 50 for generating fine bubbles is formed.

  The introduction chamber 20 is provided with an introduction port 21 at one end, from which the gas-liquid mixture L is introduced. The introduction chamber 20 communicates with the swirl chamber 30, and the inner diameter of the flow path connecting the introduction chamber 20 and the swirl chamber 30 is smaller than the inner diameters of the introduction chamber 20 and the swirl chamber 30. .

  A discharge port 31 is formed in the center portion of the bottom 11 of the nozzle body 10 located downstream of the swirl chamber 30, and the gas-liquid mixture that has swirled in the swirl chamber 30 from the discharge port 31 is formed. To derive.

  A core 40 is disposed inside the swirl chamber 30. The core 40 is formed in a substantially conical shape (specifically, a chestnut shape) and has an outer shape along the inner wall of the swirl chamber 30. The core 40 is disposed so that the top portion 42 faces the upstream side, and the bottom portion 43 is disposed so as to face the bottom portion 11 of the nozzle body 10 toward the downstream side.

  As shown in FIG. 2, the side surface 41 of the core 40 is provided with protruding blade portions 44 that change direction at a predetermined turning angle, and four similar blade portions 44 are arranged at equal intervals. A swirl flow path is formed by a gap between adjacent blade portions 44. With such a configuration, the swirl flow path generates a velocity component in the swirl direction for the gas-liquid mixture L that has flowed into the swirl chamber 30, as indicated by a two-dot chain line in FIG.

  The bottom surface 45 and the side surface 46 of the swirl flow path are formed in a step shape so as to descend in the direction in which the gas-liquid mixture L flows, and are configured to generate a vortex at this step portion. Similarly, the inner wall of the swirl chamber 30 is also formed in a step shape.

  Further, the swirl flow path 43 is configured such that the opening area of the inlet is larger than the opening area of the outlet.

  As shown in FIG. 3, on the bottom surface 47 of the core 40, there are projecting blade portions 48 that change direction at a predetermined turning angle, and four similar blade portions 48 are arranged at equal intervals. A swirl flow path is formed by a gap between adjacent blade portions 48. With such a configuration, the swirl flow path generates a velocity component in the swirl direction for the gas-liquid mixture L that has flowed into the swirl chamber 30, as indicated by a two-dot chain line in FIG. As described above, the gas-liquid mixture L becomes a swirl flow in the swirl chamber 30 by the swirl flow path formed on the outer surface (the side surface 41 and the bottom surface 47) of the core 40.

  A recess 49 is provided on the bottom surface 47 of the core 40. In addition, it is preferable to provide this recessed part 49 in the location remove | deviated from the center part of the bottom face 47 of the core 40. FIG.

  As shown in FIGS. 1 and 4, a shearing member 60 that is an example of a shearing portion is disposed inside the shearing chamber 50. The shearing member 60 is formed in a bottomed hollow cylindrical shape, and the bottomed hollow hole is a lead-out flow path 61, and the opening portion communicates with the lead-out port 31 of the swirl chamber 30. The shearing member 60 is formed with a branching channel 62 that branches from the outlet channel 61 and extends to the outer peripheral surface of the shearing member 60.

  The branch passages 62 are formed in a total of 18 in six rows in the circumferential direction of the shearing member 60 and three rows in the longitudinal direction. In the drawings, for convenience, the part numbers of all the branch flow paths are indicated as 62. As shown in FIG. 4, the branch channel 62 includes an inlet 62 a that communicates with the outlet channel 61 and an outlet 62 b that opens to the outer peripheral surface of the shear member 60. Is configured to gradually expand from the inlet 62a to the outlet 62b.

  As shown in FIG. 1, the shearing member 60 is disposed inside the shearing chamber 50 with a predetermined interval between the outer peripheral surface thereof and the inner wall of the shearing chamber 50. A discharge channel 63 is formed by a gap with the outer peripheral surface of the shearing member 60. A bubble cutting panel 64 having a plurality of holes is wound around the outer peripheral surface of the shearing member 60. Further, the shearing member 60 is held by a lid 70, and the lid 70 is attached to the end of the nozzle body 10. The lid 70 has a large number of discharge holes 71 communicating with the discharge flow path 63. For this reason, the gas-liquid mixture L flowing out from the outlet 62 b of the branch flow path 62 passes through the hole of the bubble cutting panel 64, flows into the discharge flow path 63, and is ejected from the discharge hole 71.

  On the other hand, a circulation pipe 65, which is a hollow cylindrical tubular member that opens at both ends, is inserted into the outlet channel 61. This hollow hole is the circulation channel 66. However, the circulation pipe 65 has one end closed by the bottom surface of the bottomed hollow hole of the shearing member 60 (that is, the most downstream portion of the outlet channel 61) and the other end closed by the bottom surface of the core 40. It is disposed in the path 61. Further, the circulation pipe 65 is disposed inside the outlet channel 61 with a gap between the outer peripheral surface thereof and the inner wall of the outlet channel 61, and the gas-liquid mixture L flows through this gap.

  In the circulation pipe 65, four inlet holes 66a are formed at equal intervals on the outer peripheral surface of the downstream end, and similarly, four outlet holes are formed on the outer peripheral surface of the upstream end at equal intervals. 66b is formed. The inlet hole 66 a and the outlet hole 66 b communicate the outlet channel 61 and the circulation channel 66.

  The basic operation and effects of the fine bubble generating nozzle 1 configured as described above will be described.

  The gas-liquid mixture L introduced from the introduction port 21 flows through the introduction chamber 20 and flows into the swirl chamber 30. At this time, the gas-liquid mixture L becomes a high-speed swirl flow by flowing through the swirl flow path. Furthermore, since the inner surface of the swirling channel has a step shape, a small vortex is generated. Since the frictional resistance with the gas-liquid mixture L is reduced by this vortex flow, the gas-liquid mixture L becomes a higher-speed swirl flow. In addition, since the swirling flow path is configured so that the opening area gradually decreases from the inlet to the outlet, the size of the vortex generated in the swirling flow path becomes very small, and the effect of reducing frictional resistance can be enhanced. it can.

  Further, a negative pressure is generated at a location where the concave portion 49 is provided on the bottom surface 47 of the core 40. For this reason, since a turbulent flow is generated in the gas-liquid mixture L, the bubble content is increased. The fine bubbles generated by shearing such a gas-liquid mixture L contain many micro-level and nano-level fine bubbles. The central portion of the bottom surface 47 of the core 40 is a point where the gas-liquid mixture L flowing from the four flow paths formed on the outer surface of the core 40 joins, but the concave portion 49 is located slightly away from the center. By providing the turbulent flow, the content of microbubbles at the micro level and nano level can be further increased.

  The gas-liquid mixture L that has become a high-speed swirling flow flows from the outlet 31 into the outlet passage 61, and in the outlet passage 61, the outlet pipe 61 turns around its circumference around the circulation pipe 65. It flows downstream. However, not all of the gas-liquid mixture L flows from the upstream to the downstream of the outlet channel 61, but the outer gas-liquid mixture L flows into the branch channel 62 by centrifugal force due to the swirl.

  The gas-liquid mixture L flowing through the branch channel 62 has the highest flow velocity in the vicinity of the inlet 62a, and bubbles expand due to the reduced pressure. And when flowing through the branch channel 62, the bubbles collapse and contract by being sheared, and a large amount of fine bubbles are generated at this time. In particular, since the cross-sectional area of the branch channel 62 gradually increases from the inlet 62a to the outlet 62b, the collapse and contraction of the bubbles are promoted.

  Subsequently, the gas-liquid mixture L flowing out from the outlet 62 b of the branch channel 62 is subdivided by the bubble cutting panel 64, passes through the discharge channel 63, and is ejected from the discharge port 71.

  On the other hand, the gas-liquid mixture L that has reached the most downstream side of the outlet channel 61 without flowing into the branch channel 62 flows into the circulation channel 66 in the circulation pipe 65 from the inlet hole 66 a, and in the outlet channel 61. It flows in the opposite direction to the flow of and flows out from the outlet hole 66b to the outlet channel 61. Thus, the circulation channel 66 of the circulation pipe 65 circulates a part of the gas-liquid mixture L in the outlet channel 61 from downstream to upstream. Of the gas-liquid mixture L swirling around the circulation pipe 65 in the outlet channel 61, the gas-liquid mixture L located inside reaches the most downstream portion of the outlet channel 61. Thus, it can be said that the gas-liquid mixture L swirling inside has a high gas mixing ratio, and even if it passes through the branch flow path 62, it is difficult to generate fine bubbles. According to the fine bubble generating nozzle 1 of the present invention, such a gas-liquid mixture L is repeatedly circulated to the upstream side, thereby allowing the gas and liquid mixing ratio to be appropriate and passing through the branch channel 62. The generation ratio of bubbles can be increased.

  The specific configuration of each part of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Fine bubble generation nozzle 10 Nozzle main body 11 Bottom surface 20 Introducing chamber 21 Introducing port 30 Swirling chamber 31 Outlet port 40 Core 47 Bottom surface 49 Recess 50 Shear chamber 60 Shearing member

Claims (2)

A nozzle body that forms a bottomed cylindrical shape and discharges a gas-liquid mixture from an outlet port formed in the bottom;
A core disposed in the nozzle body and having a flow path on the outer surface for turning the gas-liquid mixture flowing in the nozzle body;
A recess provided at the bottom of the core facing the bottom of the nozzle body;
A shearing section that generates fine bubbles by shearing the gas-liquid mixture discharged from the outlet of the nozzle body;
A fine bubble generating nozzle comprising:   2. The fine bubble generating nozzle according to claim 1, wherein the concave portion provided in the bottom portion of the core is located at a location deviated from the center portion of the bottom portion.

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