WO2010076843A1 - Microbubble generation device - Google Patents

Abstract

A device which introduces thereinto gas having a higher pressure than atmospheric pressure and discharges the gas as microbubbles into liquid. A microbubble generation device (1) has an introduction tube (10) having at one end (11) thereof a gas introduction section (20) into which gas supplied under pressure is introduced and at the other end (12) thereof a discharge section (70) placed in liquid and discharging the introduced gas into the liquid; a liquid introduction section (30) for introducing the liquid into the introduction tube; a mixing section (40) placed in the introduction tube at a place between the liquid introduction section and the discharge section and mixing the gas and the liquid; a gas intake section (50) for taking gas outside the introduction tube into the introduction tube to a place between the mixing section and the discharge section; and a collision plate (60) placed in the introduction tube at a place between the mixing section and the discharge section and with which the gas and liquid mixed by the mixing section collide.

Description

Microbubble generator

The present invention relates to an apparatus for making a gas having a pressure higher than that of the atmosphere into fine bubbles and releasing it into a liquid.

Conventionally, when a gas is released into a liquid for the purpose of efficiently dissolving the gas in the liquid or promoting a biological or chemical reaction between the gas and the liquid, the bubbles are made into fine bubbles (microbubbles). A fine bubble generator is used.
As such an apparatus, for example, Patent Document 1 proposes a prior art including a casing, a liquid supply cylinder that introduces liquid into the casing, and a gas supply cylinder that introduces gas. In this prior art, the liquid supplied from the liquid supply cylinder into the casing is swung, and the liquid supplied into the casing is swirled in the casing, whereby a negative pressure is generated near the center by the centrifugal force of swirling. generate. In this configuration, a configuration is disclosed in which the gas inlet of the gas supply cylinder is arranged in the portion that becomes the negative pressure, and the gas outside the casing is introduced into the negative pressure portion generated inside the casing.
At this time, in the swirling mixed liquid, a pressurized portion is generated in the vicinity of the outer periphery of the swirling, and the pressure changes when the mixed liquid passes through the negative pressure portion and the pressure increasing portion. Thus, it is considered that fine bubbles are generated by the shearing force generated by the swirling flow.

In the above-described conventional fine bubble generator, liquid is pumped into the casing to create a swirl flow, and the negative pressure generated by the swirl flow is used to take in gas from the outside of the device. The amount of gas that can be released into the casing is limited by the amount of liquid pumped into the casing. Therefore, when a large amount of gas requires fine bubbles, there is a problem that the device becomes large, such as a device capable of pumping a large amount of liquid and a large casing capable of storing the large amount of liquid. .
Therefore, it has been desired to develop a device capable of making a large amount of gas into fine bubbles and discharging it into the liquid without pumping the liquid into the casing. At present, such a device is known. Absent.
JP 2006-142300 A

An object of the present invention is to solve the above-mentioned problems. By introducing a gas having a pressure higher than atmospheric pressure, an apparatus capable of making the gas into fine bubbles and releasing it into a liquid is provided. Is to provide.

The technical means made by the present invention in order to achieve the above object is a fine bubble generating device that discharges compressed gas into fine bubbles and discharges it into the liquid, and introduces the pressurized gas into the gas introduction unit. Is provided on one end side, is disposed in the liquid, and has a cylindrical introduction pipe provided on the other end side with a discharge portion that discharges the introduced gas into the liquid, and introduces the liquid into the introduction pipe A liquid introduction section, a mixing section disposed between the liquid introduction section and the discharge section in the introduction pipe and mixing the gas and the liquid introduced into the introduction pipe, and the mixing section and the discharge section in the introduction pipe The microbubble generator is characterized in that it is provided with a collision plate that is disposed between the units and that collides with the gas mixed in the mixing unit and the liquid.
In this case, the liquid introduction part is composed of a hole penetrating from the outer surface to the inner surface of the introduction pipe, and an introduction part that is arranged in the introduction pipe so as to communicate with the hole and that is opened at a position closer to the mixing part than the hole. The liquid may be taken into the introduction pipe from the introduction portion by a negative pressure generated when the gas passes through the introduction pipe.

The mixing unit is provided between a plurality of blade members that are divided into a region on the liquid introduction unit side and a region on the discharge unit side, and between each of the blade members, and the region on the liquid introduction unit side and the discharge unit side And a mixing path that communicates with the area of the liquid introduction section. The mixing path has a narrower cross-sectional area than the cross-sectional area of the introduction pipe on the liquid introduction section side, or the area on the liquid introduction section side and the discharge section side. In some cases, the cross-sectional area may be narrower than the cross-sectional area of the introduction pipe on the liquid introduction part side. In these cases, the gas and liquid introduced into the introduction pipe are efficiently mixed when passing through the mixing path having a narrow cross-sectional area.

Further, the fine bubble generating device may include a gas intake unit that takes in gas outside the introduction tube between the mixing unit and the discharge unit in the introduction tube, or the gas introduction of the introduction tube is introduced into the introduction tube. A gas introduction cylinder having a length extending from the discharge section to the discharge section is internally provided, and the gas introduction cylinder has a gas intake section at the same end as the gas introduction section side of the introduction pipe, and the discharge section side of the introduction pipe; Formed into a thin cylinder having a second discharge part at the same end, forming a gas introduction space extending from the gas introduction part to the discharge part between the outer surface of the gas introduction cylinder and the inner surface of the introduction tube, and mixing The portion may be disposed in a gas introduction space between the outer surface of the gas introduction tube and the inner surface of the introduction tube, and the second discharge portion may be opened between the mixing portion and the collision plate.

According to the present invention, by introducing a gas having a pressure higher than the atmospheric pressure, it is possible to provide a device that can make the gas into fine bubbles and discharge it into the liquid.

Hereinafter, a fine bubble generator according to an embodiment of the present invention will be described. In the present embodiment, it is assumed that the exhaust gas (gas) forcedly fed by an air conditioner from an industrial machine or the like at a high pressure from the atmosphere is made into fine bubbles and discharged into water (liquid).
The gas that the fine bubble generating device makes fine bubbles may be any gas as long as it is pumped at a higher pressure than the atmosphere, and the liquid that is released as fine bubbles is also selected. It may be a liquid
As an example, in order to prevent the harmful substances of exhaust gas discharged from an incinerator that incinerates waste from diffusing into the atmosphere, the exhaust gas is efficiently filtered in water, or a chemical manufacturing apparatus. In this case, the intermediate purified gas is discharged into the solution to cause an efficient chemical reaction, or a large amount of air is dissolved in water to prevent water pollution in rivers and lakes.

As shown in FIGS. 1 to 6, the fine bubble generating device 1 according to the first embodiment is provided with a gas introduction part 2 for introducing a pumped gas on one end 11 side (upstream side) and disposed in a liquid. A discharge part 70 for releasing the gas introduced by the gas introduction part 20 into the liquid is provided with a cylindrical introduction pipe 10 provided on the other end 12 side (downstream side), and the liquid is introduced into the introduction pipe 10. The liquid introduction unit 30, the mixing unit 40 disposed between the liquid introduction unit 30 and the discharge unit 70 in the introduction pipe 10, and the mixing unit in the introduction pipe 10 for supplying gas outside the introduction pipe 10. 40 and a gas intake part 50 to be taken in between the discharge part 70 and a collision plate 60 arranged between the mixing part and the discharge part in the introduction pipe.

As shown in FIGS. 2 to 4, the gas introduction unit 20 is provided as an opening of one end 11 of the introduction pipe 10 (the free end of the first member 13), and introduces gas into the introduction pipe 10.
A pressure feed pipe (not shown) that conveys the gas discharged from the air conditioner is directly connected to the gas introduction unit 20, or the pressure feed pipe is connected by a relay pipe, so that the pressure feed pipe has a higher pressure than the atmosphere. The gas sent out from is introduced into the introduction pipe 10 from the gas introduction part 20.

The discharge part 70 is provided as an opening at the other end 12 of the introduction tube 10 as shown in FIGS. 2, 3, and 5. The discharge part 70 is disposed in the liquid and is supplied from the discharge part 70 to the gas introduction part 20. The gas introduced from is turned into fine bubbles and released into the liquid.

As shown in FIGS. 2 and 3, the introduction pipe 10 of the first embodiment is provided with a circular tubular first member 13 having both ends open and the first member 13 in communication with each other, and both ends are open. The second member 14 is formed in a tubular shape, and the third member is provided in communication with the second member 14 and is open at both ends. Therefore, according to the present embodiment, a circular channel having an internal space communicating from the first member to the third member is formed, and the opening on the free end side of the first member serves as the gas introduction portion 20. The opening on the free end side of the three members is a discharge portion 70.

As shown in FIGS. 2 and 3, the first member 13 is formed in a linear shape having a shaft 13b in the horizontal direction.
The second member 14 is formed in a straight line having an axis 14b that intersects the axis 13b of the first member 13 at a right angle in the vertical direction. The third member 15 is formed in a straight line having an axis 15 b that intersects the axis 14 b of the second member 14 at a right angle and is parallel to the axis 13 b of the first member 13.
Thereby, the introduction pipe 10 has a so-called crank shape as shown in FIG.
In addition, the introduction tube 10 of the present embodiment is formed in a cylindrical shape having the same inner diameter. For example, the inner diameter of the introduction tube 10 is set to 60 mm.

As shown in FIGS. 3 and 4, the introduction pipe 10 has an upper portion of the first member 13 and the second member 14 positioned above the liquid surface W of the liquid, and a lower portion of the second member 14. The third member 15 is installed so as to be immersed below the liquid surface W of the liquid. By being installed in this manner, the other end 12 of the introduction tube 10, that is, the discharge portion 70 provided at the end of the third member 15 is arranged so as to be immersed in the liquid.

In the first embodiment, the first member 13, the second member 14, and the third member 15 each formed in a circular tube shape are integrally connected in a crank shape to constitute the outer shape of the introduction tube 10. Although cases have been mentioned, the outer shape of the introduction tube 10 is not limited to the above shape.
For example, the first member 13, the second member 14, and the third member 15 may be integrally connected in a straight line to constitute the introduction tube 10. The first member 13, the second member 14, and the third member 15 may be formed in an S shape.
Furthermore, although the introduction pipe 10 is configured by three members in the present embodiment, the number of components may be two or four or more, and is not limited. Moreover, it is not comprised from several members like this embodiment, The thing formed in the shape of one continuous elongate tube may be sufficient, and it is in the scope of the present invention. Even in this case, the overall external shape may be linear, crank or S-shaped, and is not limitedly interpreted.
In addition, the inner diameter of the introduction tube 10 is not limited to the above numerical setting, and may be set freely according to demands such as the purpose of use and usage environment of the fine bubble generating device 1. In this case, the inner diameter of the introduction tube 10 is not constant from the one end 11 to the other end 12 but may be changed by setting a portion having a large diameter or a small diameter.
In the present embodiment, the cross-sectional shape of the introduction tube 10 is circular, but the present invention is not limited to this, and the cross-sectional shape of other shapes may be provided as long as the introduction tube 10 is formed in a tubular shape. . For example, a rectangular cross-sectional shape may be used.

As shown in FIGS. 2 and 3, the liquid introduction part 30 is arranged on the upstream side of the mixing part described later, and communicates with the hole 31 penetrating from the outer surface to the inner surface of the introduction pipe 10. And an introduction part 32 arranged in the introduction pipe 10.
As shown in FIGS. 3 and 4, the hole 31 is on the gas introduction part 20 side of the second member 14, and at a position where the second member 14 is submerged in the liquid when the microbubble generator 1 is installed. It is formed so as to penetrate from the outer surface to the inner surface of (introducing tube 10).
In the present embodiment, the hole diameter of the hole 31 is set to 21 mm. The hole diameter of the hole 31 is not limited to this, and may be set freely according to the demand for the amount of liquid introduced into the introduction tube 10.

As shown in FIG. 3, the introduction part 32 is connected to the hole 31 without a gap, and intersects the axis 14 b of the second member 14 from the hole 31 to the inner space of the second member 14 at a right angle. A hollow cylindrical first cylindrical portion 34a provided to project, and a hollow cylindrical shape that communicates with the first cylindrical portion 34a and that is disposed in parallel with the shaft 14b toward the downstream side (downward in the drawing). The second cylindrical portion 34b is provided, and an opening 33 is provided on the free end side of the second cylindrical portion 34b. Further, the introduction part 32 is arranged so that the opening 33 is closer to the mixing part 40 described later than the hole 31.

In the present embodiment, as shown in FIG. 3, the second cylindrical portion 34 b is formed so that the opening 33 is positioned near the shaft 15 b of the third member 15.
Accordingly, when the gas passes through the introduction pipe 10, the pressure around the liquid introduction portion 30 becomes negative due to the flow velocity, so that the liquid outside the introduction pipe 10 is introduced into the second member 14 (introduction from the hole 31. The air is drawn into the inner space of the pipe 10) and discharged from the opening 33 on the downstream side of the hole 31 into the inner space of the introduction pipe 10.
Further, in the present embodiment, the opening 33 is formed so as to be positioned near the shaft 15b of the third member 15, and the opening 33 opens near the shaft 15b, so that the liquid introduced into the introduction pipe 10 Is pulled by a gas stream sent in the direction of the mixing unit 40, which will be described later, and proceeds in the direction of the mixing unit 40 efficiently.

The liquid introduction unit 30 is not construed as being limited to the configuration described in the present embodiment, and can be changed in design within the scope of the present invention.
Further, in the present embodiment, one embodiment in which the hole 31 is provided at a predetermined position of the second member 14 that is submerged in the liquid is described. However, the hole 31 is located outside the liquid. It may be a form. That is, as long as the outer pipe (not shown) arranged in the liquid is connected to the hole 31 located outside the liquid, the same effects as the present invention can be achieved. The outer pipe is required to have a length that allows the liquid to be drawn into the introduction pipe 10 by the negative pressure generated in the introduction pipe 10.

As shown in FIG. 2, the mixing unit 40 is formed in a propeller shape with three blade members 42 a, 42 b, 42 c, and the blade members 42 a, 42 b, 42 c are connected by a connecting member 53, respectively. Yes.
Specifically, as shown in FIGS. 2 and 3, the connecting member 53 includes a hollow inner region 53 a in which one surface (a surface that becomes a so-called triangular pyramid-shaped bottom surface) is a triangular opening 53 e. The introduction pipe is formed such that the axis connecting the opening 53e and the apex 55a of the triangular pyramid facing the opening 53e is the same as the axis 15b of the third member 15. 10 is arranged in the center of the cross-sectional direction.
The opening 53 e of the connecting member 53 is located closest to the discharge unit 70 of the mixing unit 40.

As shown in FIGS. 2A and 2B, the blade members 42a, 42b, and 42c are inclined surfaces (opening portions from the apex 55a of the triangular pyramid to the bottom surface) except for the opening 53e of the connecting member 53. 53c, 53d, and 53e (inclined toward 53e) and the inner surface of the third member 15 are arranged in a substantially fan shape.
The blade member 42a has a surface 53c extending from a triangular vertex 55b of the opening 53e to a position 45a that is a predetermined distance away from the other vertex 55c on the side 43a connecting the other vertex 55c of the triangle and the vertex 55a of the triangular pyramid. The base end portion 44a is integrally fixed to the base member 44, and the base end portion 44a and the inner surface of the third member 15 are formed with a rising portion 46a formed in an expanded shape. The upper end of the rising portion 46 a is formed in the same arc shape as the inner surface of the third member 15 and is fixed integrally with the inner surface of the third member 15. That is, the blade member 42 a has a shape of an inclined blade to which an inclination is added when viewed in the radial direction of the third member 15.
The blade member 42b has a surface 53d extending from a triangular vertex 55c of the opening 53e to a position 45b that is a predetermined distance away from the other vertex 55d on the side 43b connecting the other vertex 55d of the triangle and the vertex 55a of the triangular pyramid. A base end portion 44b fixed integrally with the base end portion 44b, and a rising portion 46b formed between the base end portion 44b and the inner surface of the third member 15 so as to expand. The upper end of the rising portion 46 b is formed in the same arc shape as the inner surface of the third member 15 and is fixed integrally with the inner surface of the third member 15. In other words, the blade member 42 b has a shape of an inclined blade to which an inclination is added as viewed in the radial direction of the third member 15.
The blade member 42c has a surface 53e extending from a triangular vertex 55d of the opening 53e to a position 45c at a predetermined distance from the other vertex 55b on the side 43c connecting the other vertex 55b of the triangle and the vertex 55a of the triangular pyramid. The base end portion 44c is integrally fixed to the base member 44, and the base end portion 44c and the inner surface of the third member 15 are provided with a rising portion 46c formed in an expanded shape. The upper end of the rising portion 46 c is formed in the same arc shape as the inner surface of the third member 15 and is fixed integrally with the inner surface of the third member 15. That is, the blade member 42c has a shape of an inclined blade to which an inclination is added in the radial view of the third member 15.

As shown in FIG. 2 (b), the blade members 42a, 42b, 42c formed in this way are adjacent to each other between the blade members 42a and 42b, 42b and 42c, and 42c and 42a, respectively. Thus, overlapping regions that are separated from each other by a predetermined distance are formed, and in each of the overlapping regions, the mixing paths 41a, 41b, and 41c that respectively connect the region on the liquid introduction unit 30 side and the region on the discharge unit 70 side. Is formed.
Accordingly, with the above-described configuration, the liquid mixture that has reached the mixing unit 40 passes only through the mixing paths 41a, 41b, and 41c, and is located upstream of the mixing unit 40 (on the liquid introduction unit 30 side with the mixing unit 40 as a boundary). ) And the downstream area (area on the discharge section 70 side of the mixing section 40).

The mixing paths 41a, 41b, and 41c have a cross-sectional area that is narrower than the cross-sectional area of the introduction pipe 10 on the liquid introduction part 30 side. Thereby, the liquid mixture in which the gas introduced from the gas introduction part 20 and the liquid introduced from the liquid introduction part 30 coexist along the inclination of the three surfaces 53c, 53d, and 53e of the connecting member 53. The third member 15 is gradually guided in the direction toward the inner surface side of the third member 15, and the flow rate becomes faster when passing through the mixing paths 41a, 41b, 41c. A spiral turning motion along the axis of.

In addition, when the mixed liquid in which gas and liquid are mixed makes a swirling motion, centrifugal force directed to the outer peripheral side of the swirling (the side where the inner surface of the introduction pipe 10 is located) acts on the mixed liquid. In the pressure distribution of the mixed liquid, the pressure on the outer peripheral side is high, and the pressure on the center side (side where the axis of the third member 15 is located) is low.
For this reason, since the pressure is high on the outer peripheral side, the bubbles are dissolved in the liquid, and on the central side, the pressure is low, so that bubbles are generated by cavitation. In this way, by repeating the dissolution and generation of bubbles, the gas becomes fine bubbles.

In the present embodiment, the case where the connecting member 53 is formed in a triangular pyramid shape has been described as an example. However, the shape of the connecting member 53 is not limited to this, and the flow resistance in the inner region of the introduction pipe 10 is not limited thereto. Other shapes may be used as long as a shape that is difficult to form is employed. For example, it may be formed in a shell-shaped conical shape, and the bottom of the conical shape may be an opening.
Further, in the present embodiment, the description has been given by using the connecting member 53 as the configuration of the mixing unit 40. However, the connecting member 53 is not an essential constituent element in the present invention, but only the blade members 42a, 42b, and 42c. It may be configured.

In addition, in this embodiment, although it is set as the blade member structure mentioned above, it is not limited to this and a design change is possible within the scope of the present invention. For example, the embodiment in which the base end portions 44a, 44b, and 44c are provided from the respective triangular vertices 55b, 55c, and 55d of the opening 53e has been described, but from a position away from each of the vertices 55b, 55c, and 55d. Even the provided form is within the scope of the present invention. Further, the base end portions 44a, 44b, and 44c may be provided in parallel with the triangular sides of the opening 53e. That is, when the mixed liquid of gas and liquid upstream of the mixing unit 40 is sent to the discharge unit 70 downstream of the mixing unit, the mixing paths 41a, 41b, and 41c through which the mixed liquid passes are introduced pipes The configuration is not particularly limited as long as a configuration having a cross-sectional area narrower than 10 is adopted.

As shown in FIGS. 1 to 3 and 5, the gas intake unit 50 includes a tube 52 that introduces a gas from the outside of the introduction tube 10 and takes it closer to the discharge unit 70 than the mixing unit 40.
The tube 52 intersects the shaft 15b of the third member 15 at a right angle from the connecting member 53 of the mixing unit 40 through a through hole 54 provided in the upper portion of the third member 15, and one end of the tube 52 The opening 52c of 52a is arranged so as to be positioned above the liquid surface W of the liquid.

2 and 3, the other end 52b of the tube 52 is inserted into the internal region of the third member 15 through the through hole 54, and the opening 52d of the other end 52b is formed as a blade member. It communicates with the hollow inner region 53a of the connecting member 53 on the upstream side (the liquid introduction part 30 side) with respect to 42a, 42b, and 42c.
Although the through hole 54 is formed to have a diameter slightly larger than the outer diameter of the tube 52, the gap between the through hole 54 and the tube 52 is closed, so that the third member extends from the through hole 54. The liquid outside 15 does not enter the inner region of the third member 15.

Thereby, the gas outside the introduction pipe 10 is introduced from one end 52a of the pipe 52, and taken into the internal region 53a of the connecting member 53 from the other end 53b. In this case, since the opening 53 e of the connecting member 53 is positioned closest to the discharge unit 70 of the mixing unit 40, the gas outside the introduction pipe 10 is taken closer to the discharge unit 70 than the mixing unit 40. become.
In the first embodiment, an air pump (not shown) is connected to one end 52a of the pipe 52 of the gas intake unit 50, and outside air is forcibly introduced from the air pump. Therefore, the amount of gas discharged from the connecting member 53 of the gas intake unit 50 can be changed according to the operating amount of the air pump.

The outer diameter of the pipe 52 of this embodiment is set to 6 mm, and the inner diameter is set to 4 mm. The outer diameter and inner diameter of the pipe 52 are not limited to this, and may be set freely according to the demand for the amount of gas introduced outside the introduction pipe 10.

On the downstream side of the mixing unit 40, a swirl of the mixed liquid is formed by the mixing unit 40 along the shaft 15 b of the third member 15, and is taken in from the gas intake unit 50 at a substantially central portion of the swirl. The gas discharged from the opening 53b of the connecting member 53 joins.
At this time, the pressure in the substantially central portion of the spiral is lower than that in the outer diameter side portion of the spiral, and the gas in the gas introduction unit 20 is higher than the atmospheric pressure. The gas from the gas intake unit 50 is efficiently sucked into the introduction pipe 10 without the mixed liquid flowing backward. And the gas from the gas taking-in part 50 becomes a fine bubble by repeating a turning motion with the liquid mixture in which the gas and the liquid were mixed.

2 and 3, the collision plate 60 is a plate disposed between the mixing unit 40 and the discharge unit 70, and extends from the inner surface of the introduction tube 10 along the axis 15 b of the third member 15. It is extended.
In the present embodiment, the collision plate 60 is raised from the lower inner surface of the third member 15 toward the shaft 15b to a height that is half the inner diameter of the introduction tube 10, and the upstream side of the collision plate 60 is It is formed in an arc shape.
The swirled mixed liquid takes in the gas from the gas take-in portion 50 and collides with the collision plate 60 as a swirl while continuing swirling. At this time, relatively large bubbles that did not become fine bubbles when passing through the mixing unit 40 and gas from the gas intake unit 50 are sheared to become fine bubbles. In addition, the flow in the swirling direction of the mixed liquid is rectified by the collision plate 60 into a flow in a direction in which the mixed liquid is discharged into the liquid.

According to the first embodiment, the gas introduced into the introduction pipe 10 from the gas introduction part 20 causes the liquid outside the introduction pipe 10 to enter the introduction pipe 10 due to the negative pressure when passing through the liquid introduction part 30. While being introduced, the gas introduced into the introduction pipe 10 and the liquid introduced from the liquid introduction part 30 are efficiently mixed when passing through the mixing paths 41a, 41b, 41c of the mixing part 40. . The gas and the liquid mixed through the mixing unit 40 collide with the collision plate 60 while forming fine bubbles, thereby generating a large amount of fine bubbles (microbubbles) and releasing them into the liquid. . Furthermore, the amount of fine bubbles can be increased by additionally introducing outside air from the gas intake unit 50.

Thus, the fine bubble generating device 1 according to the first embodiment is economical because it does not need to pump the liquid into the casing (inside the device) when generating fine bubbles. In addition, since fine bubbles can be generated according to the amount of outside air introduced, the exhaust from a factory or internal combustion engine can be dissolved in liquid and purified, or the biological or chemical of gas and liquid This is suitable for promoting a typical reaction.

Further, in the present embodiment, the configuration in which the liquid introduction unit 30 is disposed at a position where the liquid introduction unit 30 is submerged in the liquid has been described, but the liquid introduction unit 30 is not submerged in the liquid and is positioned above the liquid surface W of the liquid. It can also be set as the structure arranged so.
In this case, on the outer surface of the introduction tube 10, the liquid is supplied to the hole 31, such as providing an introduction tube that extends from the hole 31 of the liquid introduction part 30 without a gap and whose tip side is submerged in the liquid. Just do it.

In the present embodiment, the configuration including the gas intake unit 50 has been described. However, the configuration is not limited thereto, and a configuration without the gas intake unit 50 may be used. In the case of a configuration that does not include the gas intake unit 50, only the pressurized gas from the gas introduction unit 20 is introduced into the introduction pipe 10, and thus the fine bubbles released from the discharge unit 70 include gas. Since only the pressurized gas from the introduction part 20 is included and the gas outside the introduction pipe 10 is not included, it may be selected according to the demand for generating fine bubbles of only the pressurized gas from the gas introduction part 20. .

Even if the microbubble generator 1 has a different configuration, the same effects as those of the first embodiment described above can be obtained. Below, the structure of the microbubble generator 1 by Example 2 is demonstrated.
In the fine bubble generating apparatus 1 according to the second embodiment, the gas introduction unit 20 for introducing the pumped gas is provided on the one end 11 side (upstream side), and the gas introduced into the liquid is introduced in the gas introduction unit 20. A cylindrical introduction pipe 10 provided with a discharge part 70 for discharging the liquid into the other end 12 (downstream side), a liquid introduction part 30 for introducing the liquid into the introduction pipe 10, and the introduction pipe 10, the mixing unit 40 disposed between the liquid introduction unit 30 and the discharge unit 70, and the mixing unit 40 in the introduction tube 10, which is incorporated in the introduction tube 10, is connected to the mixing unit 40 in the introduction tube 10. A gas introduction cylinder 80 to be taken in between the discharge section 70 and a collision plate 60 disposed between the mixing section 30 and the discharge section 70 in the introduction pipe 10 are provided (see FIGS. 7 to 14).

Further, in this embodiment, the schematic shape of the introduction pipe 10 and the configuration of the gas introduction section 20 and the discharge section 70 are the same as those in the first embodiment, so that the description thereof will be omitted. The configurations of the liquid introduction unit 30, the mixing unit 40, the gas introduction cylinder 80, and the collision plate 60, which are characteristic configurations of the above, will be described.
In the present embodiment, the introduction pipe 10 is configured such that the upper parts of the first member 13 and the second member 14 are located above the liquid surface W of the liquid, and the middle part of the second member 14 and the third member 15 are provided. The liquid introduction part 30 is disposed so as to be submerged below the liquid surface W of the liquid, and thereby the liquid introduction part 30 disposed in the middle part of the second member 14 and the discharge part provided at the end part of the third member 15. 70 is submerged in the liquid.

As shown in FIGS. 8 and 9, the gas introduction cylinder 80 according to the present embodiment is disposed and arranged from the gas introduction part 20 to the discharge part 70 of the introduction pipe 10.
The gas introduction cylinder 80 has a gas intake part 81c at the same end 81a as the gas introduction part 20 side of the introduction pipe 10 and a second end 81b same as the discharge part 70 side of the introduction pipe 10 at the second end 81b. It is formed in a thin cylindrical shape having two discharge portions 81d.
Specifically, the gas introduction cylinder 80 is formed along the shafts 13b, 14b, and 15b in the extending directions of the first member 13, the second member 14, and the third member 15 of the introduction pipe 10, and is a gas intake portion. 81 c opens in the same plane as the gas introduction part 20 of the introduction pipe 10, and the second discharge part 81 d opens between the mixing part 40 and the collision plate 60.

By arranging the gas introduction cylinder 80 in this way, a part of the gas introduced into the introduction pipe 10 from the gas introduction part 20 is introduced into the gas introduction cylinder 80 from the gas intake part 81c, and the first It is discharged between the mixing part 40 and the collision plate 60 via the two discharge parts 81d.
In this embodiment, since the gas intake part 81c of the gas introduction cylinder 80 is open on the same surface as the gas introduction part 20 of the introduction pipe 10, the amount of gas discharged from the second discharge part 81d is , And changes depending on the amount of gas introduced by being pumped to the gas introduction unit 20.

A gas introduction space 10 a extending from the gas introduction part 20 of the introduction pipe 10 to the discharge part 80 is formed between the outer surface of the gas introduction cylinder 80 and the inner surface of the introduction pipe 10. In this gas introduction space 10a, there is a path for conveying the gas introduced into the introduction pipe 10 from the gas introduction part 20 through the periphery of the liquid introduction part 30 along the introduction pipe 10 to the mixing part 40. Become.
Therefore, the outer diameter of the gas introduction cylinder 80 is set to a sufficiently smaller diameter than the inner diameter of the introduction pipe 10 in order to leave a gas introduction space 10a through which gas can sufficiently pass in the inner region of the introduction pipe 10. There is a need. In the present embodiment, the diameter of the introduction tube 10 is 60 mm, whereas the outer diameter of the gas introduction tube 80 is set to 17 mm and the inner diameter is set to 15 mm. The outer diameter of the gas introduction cylinder 80 is not limited to the above numerical setting, and may be set freely according to the demand for the amount of gas introduced by the gas introduction cylinder 80.

Further, as shown in FIGS. 8 to 10 and 12 to 13, the gas introduction cylinder 80 is provided by a thin rod-shaped support member 80 a provided from the inner wall surface of the introduction pipe 10 toward the gas introduction cylinder 80. A cross-sectional view of the introduction tube 10 is supported at a substantially central portion. In the present embodiment, the support member 80a includes the vicinity of the gas introduction part 20 of the first member 13 (introduction pipe 10), the downstream side 13a of the first member 13 (introduction pipe 10), and the third member 15 (introduction pipe 10). ) On the upstream side. Specifically, each support member 80 a is provided with four support members 80 a at intervals of 90 ° in cross-sectional view of the introduction pipe 10 in the vicinity of the gas introduction part 20 of the first member 13. On the downstream side 13a and the upstream side of the third member 15, three support members 80a are provided at intervals of 90 ° in a sectional view of the introduction tube 10.

As shown in FIGS. 7 to 13, the liquid introduction part 30 includes a hole 31 for sucking the liquid on the outer surface side of the introduction pipe 10 toward the inner surface side, and a mixing part for sucking the liquid sucked from the hole 31 through the hole 31. It is comprised with the introduction part 32 which discharge | releases to the inner side area | region of the 2nd member 14 near 40.

The hole 31 is the second member 14 positioned on the downstream side of the gas introduction unit 20, and penetrates from the outer surface of the introduction tube 10 to the inner surface at a position where it is submerged in the liquid when the fine bubble generating device 1 is installed. Is formed.
In the second embodiment, the hole 31 includes four holes 31a, a hole 31b, a hole 31c, and a hole 31d.
In this case, the two holes 31a and 31c are formed so as to oppose each other in the radial direction of the second member 14 of the introduction tube 10 as shown in FIGS.
Further, as shown in FIGS. 10 and 11, the holes 31b are formed so as to be arranged in the vertical direction with the holes 31a.
Furthermore, as shown in FIGS. 10 to 14, the holes 31 d are arranged in the longitudinal direction with respect to the holes 31 b and are formed so as to face the radial direction of the holes 31 b and the second member 14.
The holes 31a and 31b have an inner diameter of 8 mm, and the holes 31c and 31d have an inner diameter of 10 mm.
The vertical positions of the holes 31a and 31b and the holes 31c and 31d facing each other in the radial direction of the second member 14 are not positioned at the same height in the second embodiment, but from the top, the holes 31a and 31d are positioned at the same height. , Holes 31c, holes 31b, and holes 31d are alternately arranged in this order.

In the second embodiment, the inner diameters of the holes 31a and 31b and the holes 31c and 31d are the above-described inner diameters. However, the hole diameter can be freely set according to the use environment and the demand for performance to generate fine bubbles. It ’s fine.
In the second embodiment, the case where the four holes 31a, 31b, 31c, and 31d are provided as the holes 31 of the liquid introduction unit 30 has been described. However, the number of the holes 31 is not limited thereto. The amount of gas introduced from the gas introduction unit 20 and the diameter of the introduction tube 10 may be set freely. Further, the positions of the hole 31a, the hole 31c, the hole 31b, and the hole 31d are not limited and may be set freely according to the use environment.

As shown in FIGS. 8 and 12, the introduction portion 32 is a box-shaped member formed so as to be in close contact with the inner surface of the second member 14 and to cover the hole 31 from the inner region side of the second member 14. In addition, an opening 33 is provided on the downstream side of the hole 31.
In the configuration according to the second embodiment, since the four holes 31a, 31b, 31c, and 31d are provided as the holes 31, an introduction portion 32a is provided in each hole 31a, and an introduction portion 32b is provided in each hole 31b. Each hole 31c is provided with an introduction portion 32c, and each hole 31d is provided with an introduction portion 32d.
Specifically, as shown in FIG. 8, the introduction part 32a (introduction part 32b, introduction part 32c, introduction part 32d) is formed in the same shape, and is upstream of the hole 31a (holes 31b, 31c, 31d). Side (upper side in the figure) and both lateral sides, and has an opening 33a (opening parts 33b, 33c, 33d) directed toward the downstream side (lower side in the figure). The two members 14 are formed so as to protrude toward the shaft 14b. Thereby, each cover 32a (32b, 32c, 32d) communicates with the hole 31a (holes 31b, 31c, 31d) and the opening 33a (openings 33b, 33c, 33d) and the inner surface of the introduction pipe 10 It is integrally formed.

Further, since the holes 31a, 31b, 31c, and 31d of the liquid introduction part 30 are submerged in the liquid, the gas that is vigorously introduced into the gas introduction part 20 is the second member 14 of the introduction pipe 10. When passing through, the vicinity of the introduction portions 32a, 32b, 32c, 32d becomes negative pressure. At this time, the liquid outside the second member 14 (introducing pipe 10) is drawn into and introduced into the introducing pipe 10 having a negative pressure from the holes 31a, 31b, 31c, and 31d.
In this embodiment, the case where the openings 33a, 33b, 33c, and 33d of the introduction portions 32a, 32b, 32c, and 32d are arranged toward the downstream side (the lower side in the figure) has been described. , 33b, 33c, and 33d are not limited to the opening directions, and the holes 31a, 31b, 31c, and 31d may be used in order to prevent the gas inside the introduction pipe 10 from flowing backward when the liquid is introduced. The opening is not particularly limited as long as the opening is further downstream. For example, the openings 33a, 33b, 33c, and 33d may be arranged in the direction along the inner peripheral surface of the introduction pipe 10 on the downstream side of the holes 31a, 31b, 31c, and 31d.

As shown in FIGS. 8 and 9, the mixing unit 40 is between the liquid introduction unit 30 and the discharge unit 70 in the third member 15 positioned on the downstream side of the liquid introduction unit 30, and includes a gas introduction cylinder 80. Is disposed in the gas introduction space 10 a between the outer surface of the gas and the inner surface of the introduction pipe 10.
Specifically, as illustrated in FIG. 8, the mixing unit 40 has a spiral shape (spiral winding) that is divided into a region on the liquid introduction unit 30 side and a region on the discharge unit 70 side in the gas introduction space 10 a. The continuously arranged wall 41 is formed integrally with the inner surface of the introduction tube 10 to form a spiral mixing path 41a that connects the region on the liquid introduction unit 30 side and the region on the discharge unit 70 side. is doing.

The cross-sectional area of the mixing path 41a is set to be narrower than the cross-sectional area of the introduction pipe 10 on the liquid introduction part 30 side. As a result, a mixed liquid in which the gas introduced from the gas introducing part 20 and the liquid introduced from the liquid introducing part 30 are mixed is increased in flow velocity when passing through the mixing path 41a, and is efficiently mixed. In addition, a spiral turning motion along the axis 15b of the third member 15 is performed.

When the mixed liquid in which the gas and the liquid are mixed makes a swivel motion, as described in the first embodiment, the centrifugal force toward the outer periphery side of the swirl (the side where the inner surface of the introduction pipe 10 is located). The pressure on the outer peripheral side increases, and the pressure on the center side (the side where the shaft 15b of the third member 15 is present) decreases. The bubbles become fine bubbles by dissolving bubbles generated at this time and generating bubbles due to cavitation.

On the downstream side of the mixing unit 40, a spiral of the mixed liquid is formed by the mixing unit 40 along the axis 15 b in the extending direction of the third member 15, and the gas intake unit is formed at a substantially central portion of the spiral. The gas discharged from the 80 second discharge part 81d merges.
At this time, the pressure in the substantially central portion of the spiral is lower than that in the outer diameter side portion of the spiral, and the gas in the gas introduction unit 20 is higher in pressure than the atmospheric pressure, so that it is mixed into the second discharge unit 81d. The gas passing through the gas intake part 80 is efficiently sucked into the introduction pipe 1 without the liquid flowing backward.
The gas sucked into the introduction pipe 1 from the gas intake part 80 is taken into the spiral by the mixing part 40. At this time, since the tube 81 of the gas intake unit 80 is formed with a small diameter, the gas discharged from the second discharge unit 81d of the gas intake unit 580 is a relatively small bubble, and the small bubble is swirled. It becomes a fine bubble by being taken in.

As shown in FIGS. 7 to 9 and 11, the collision plate 60 is a plate disposed between the second discharge portion 81 d of the gas intake portion 80 and the discharge portion 70, and is an inner surface of the introduction pipe 10. To the third member 15 along the axis 15b.
In the present embodiment, the collision plate 60 is raised from the inner side surface of the third member 15 toward the shaft 15b.
The swirled mixed liquid takes in the gas from the gas intake unit 80 and collides with the collision plate 60 as a swirl while continuing swirling. At this time, a relatively large bubble that has not become a fine bubble or a gas from the gas intake unit 80 is sheared to become a fine bubble. In addition, the flow in the swirling direction of the mixed liquid is rectified by the collision plate 60 into a flow in a direction in which the mixed liquid is discharged into the liquid.

In the present embodiment, the configuration including the gas intake unit 80 has been described. However, the configuration is not limited thereto, and a configuration without the gas intake unit 80 may be used. In the case of a configuration that does not include the gas intake unit 80, only the pressure-feed gas from the gas introduction unit 20 is introduced into the introduction pipe 10, so that the fine bubbles released from the discharge unit 70 include gas Since only the pressurized gas from the introduction part 20 is included and the gas outside the introduction pipe 10 is not included, it may be selected according to the demand for generating fine bubbles of only the pressurized gas from the gas introduction part 20. .

(Modification 1)
In the microbubble generator 1, the gas introduction tube 80 of the second embodiment may be combined with the mixing unit 40 of the first embodiment. Even with such a configuration, the same effects as those of the first and second embodiments can be obtained.
That is, the gas introduction cylinder 80 is arranged from the gas introduction part 20 to the discharge part 70 of the introduction pipe 10, and is further formed between the outer surface of the gas introduction cylinder 80 and the inner surface of the introduction pipe 10. Propeller-like blade members 42a, 42b, and 42c may be formed in the gas introduction space 10a to have a mixing path 41a between the blade members 42a, 42b, and 42c.
Since other configurations are the same as those of the first and second embodiments, the description thereof is omitted.

(Modification 2)
In the microbubble generator 1, the gas intake section 50 of the first embodiment may be combined with the mixing section 40 of the second embodiment. Even with such a configuration, the same effects as those of the first and second embodiments can be obtained.
That is, the wall 41 continuously arranged in a spiral shape (spiral winding) divided into a region on the liquid introduction unit 30 side and a region on the discharge unit 70 side is formed integrally with the inner surface of the introduction tube 10. Thus, a spiral mixing path 41a that connects the region on the liquid introduction unit 30 side and the region on the discharge unit 70 side is formed, and the introduction is performed between the mixing unit 40 and the discharge unit 70 having such a configuration. The opening 52d of the other end 52b of the pipe 52 of the gas intake part 50 for taking in the gas outside the pipe 10 may be communicated.
Since other configurations are the same as those of the first and second embodiments, the description thereof is omitted.

1 is an external perspective view of a fine bubble generator according to Embodiment 1. FIG. (A) is a perspective view which shows the internal structure of the microbubble generator by Example 1, (b) is a perspective view which shows the structure of a blade member and a connection member. FIG. 1 is a longitudinal sectional view taken along line AA in FIG. FIG. 3 is an end view taken along line BB in FIG. FIG. 3 is an end view taken along the line CC in FIG. FIG. 3 is a longitudinal sectional view taken along line DD in FIG. It is an external appearance perspective view of the microbubble generator by Example 2. FIG. It is a perspective view which shows the internal structure of the microbubble generator by Example 2. FIG. FIG. 7 is a longitudinal sectional view taken along line EE. FIG. 9 is an end view taken along line FF. FIG. 9 is an end view taken along line GG. FIG. 9 is a longitudinal sectional view taken along line HH. FIG. 9 is a longitudinal sectional view taken along line II. FIG. 9 is a sectional view taken along line JJ.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fine bubble generator 10 Introducing pipe 11 One end 12 of introducing pipe 13 Other end 13 of introducing pipe First member 13b First member shaft 14 Second member 14b Second member shaft 15 Third member 15b Third member shaft 20 Gas introduction part 30 Liquid introduction part 31 Liquid introduction part hole 32 Introduction member 33 Opening 40 Mixing part 41a, 41b, 41c Mixing path 42a Blade member 42b Blade member 42c Blade member 50 Gas intake part 53 Connecting member 53a Internal region 53b Opening 53c Surface 53d Surface 53e Surface 60 Collision plate 70 Discharge part

Claims (8)

A fine bubble generating device that discharges compressed gas into a liquid into fine bubbles,
A cylindrical introduction pipe provided with a gas introduction part for introducing the pumped gas on one end side, disposed in the liquid and having a discharge part for releasing the introduced gas into the liquid on the other end side; ,
A liquid introduction part for introducing the liquid into the introduction tube;
In the introduction tube, a mixing unit that is disposed between the liquid introduction unit and the discharge unit, and mixes the gas and the liquid introduced into the introduction tube;
A fine bubble generating apparatus, comprising: a collision plate disposed between a mixing unit and a discharge unit in the introduction pipe and colliding with a gas and a liquid mixed in the mixing unit. The liquid inlet is
A hole penetrating from the outer surface to the inner surface of the introduction tube, and an introduction portion that is arranged in the introduction tube in communication with the hole and opens at a position closer to the mixing portion than the hole,
The fine bubble generating device according to claim 1, wherein a liquid is taken into the introduction pipe from the introduction section due to a negative pressure generated when a gas passes through the introduction pipe. The mixing section
A plurality of blade members that are divided into a region on the liquid introduction unit side and a region on the discharge unit side;
It is provided between each blade member, and is composed of a mixing path that communicates the region on the liquid introduction part side and the region on the discharge part side,
The mixing path has a cross-sectional area narrower than the cross-sectional area of the introduction pipe on the liquid introduction part side,
The fine bubble generator according to claim 1, wherein the gas and the liquid introduced into the introduction pipe are efficiently mixed when passing through a mixing path having a narrow cross-sectional area. The mixing section
While communicating in a spiral shape divided into a region on the liquid introduction unit side and a region on the discharge unit side,
Having a cross-sectional area narrower than the cross-sectional area of the introduction pipe on the liquid introduction part side,
The fine bubble generator according to claim 1, wherein the gas and the liquid introduced into the introduction pipe are efficiently mixed when passing through a mixing path having a narrow cross-sectional area. The mixing section
A plurality of blade members that are divided into a region on the liquid introduction unit side and a region on the discharge unit side;
It is provided between each blade member, and is composed of a mixing path that communicates the region on the liquid introduction unit side and the region on the discharge unit side,
The mixing path has a cross-sectional area narrower than the cross-sectional area of the introduction pipe on the liquid introduction part side,
The fine bubble generator according to claim 2, wherein the gas and the liquid introduced into the introduction pipe are efficiently mixed when passing through a mixing path having a narrow cross-sectional area. The mixing section
While communicating in a spiral shape divided into a region on the liquid introduction unit side and a region on the discharge unit side,
Having a cross-sectional area narrower than the cross-sectional area of the introduction pipe on the liquid introduction part side,
The fine bubble generator according to claim 2, wherein the gas and the liquid introduced into the introduction pipe are efficiently mixed when passing through a mixing path having a narrow cross-sectional area. The fine bubble generator according to any one of claims 1 to 6, further comprising a gas intake unit that takes in gas outside the introduction tube between the mixing unit and the discharge unit in the introduction tube. In the introduction pipe, a gas introduction cylinder having a length extending from the gas introduction part to the discharge part of the introduction pipe is internally provided,
The gas introduction cylinder has a gas intake part at the same end as the gas introduction part side of the introduction pipe, and a thin cylinder shape having a second discharge part at the same end as the discharge part side of the introduction pipe. Formed,
Forming a gas introduction space extending from the gas introduction part to the discharge part between the outer surface of the gas introduction cylinder and the inner surface of the introduction pipe;
The mixing portion is disposed in a gas introduction space between the outer surface of the gas introduction tube and the inner surface of the introduction tube, and the second discharge portion is opened between the mixing portion and the collision plate. The fine bubble generator according to any one of claims 1 to 6.

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