JP2014004553A - Gas-liquid mixing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas-liquid mixing device capable of achieving excellent miniaturization of air bubbles by increasing the velocity of an air flow while effectively preventing clogging.SOLUTION: A gas-liquid mixing device includes: an outer cylinder 11 provided with a plurality of projections 30 on a downstream side of an internal surface 11b; an inner cylinder 12 housed in the outer cylinder 11 with a space W1 from the internal surface 11b on an upstream side of a region where the projections 30 are arranged; and a ventilation port 16 supplying gas to a gap space S1 made of the space W1. A plurality of protrusions 50 protruding toward the internal surface 11b of the outer cylinder 11 are provided on an external surface of the inner cylinder 12 and on a downstream side of the ventilation port 16. The protrusions 50 include upstream protrusions 51 on the upstream side and downstream protrusions 52 on the downstream side. The upstream protrusions 51 have wider widths from the upstream side toward the downstream side while the downstream protrusions 52 have narrower widths from the upstream side toward the downstream side. The projections 30 are arranged on the downstream side of the downstream protrusions 52.

Description

  The present invention relates to a gas-liquid mixing apparatus that mixes generated bubbles and a liquid.

Conventionally, gas-liquid mixing devices have been used for water purification, chemical reaction promotion, and the like. For example, a device 1 shown in FIG. 7 is known (see, for example, Patent Document 1).
The apparatus 1 shown in FIG. 7 includes an outer cylinder 2 and an inner cylinder 3 that is shorter than the outer cylinder 2, and the inner cylinder 3 is accommodated on the upstream side of the outer cylinder 2. A plurality of protrusions 4 are provided on the downstream inner surface of the outer cylinder 2 where the inner cylinder 3 is not disposed.
The inner cylinder 3 has a smaller outer diameter than the outer cylinder 2, and a gap 5 is formed between the outer cylinder 2 and the inner cylinder 3, and gas is sent to the gap 5 from the air blowing port 6. Yes.

  Since the apparatus 1 in FIG. 7 has such a configuration, the gas is ejected from the blower opening 6 through the gap 5 into the internal space S on the downstream side of the outer cylinder 2 and hits the plurality of protrusions 4 to form fine bubbles. Generated. On the other hand, the liquid is drawn from the bottom side 3a of the inner cylinder 3 and supplied to the internal space S on the downstream side, and is mixed with fine bubbles generated by the plurality of protrusions 4 so that the top of the outer cylinder 2 It comes to come out of. In this way, the internal space S on the downstream side of the outer cylinder 2 becomes a mixed region where the liquid and the bubbles are mixed, thereby improving the oxygen dissolution efficiency. The liquid is smoothly supplied to the mixing region through the inner cylinder 3 without any obstacles. Furthermore, since the liquid and the gas flow in different paths in the same direction, the liquid flow It is an excellent device without clogging and without clogging.

Table 2008-139728

By the way, the apparatus 1 in FIG. 7 creates fine bubbles by utilizing the phenomenon of airflow separation. That is, when the velocity of the airflow is increased, a separation phenomenon occurs between the high velocity airflow and the slow airflow around the protrusion 4, and this separation causes a vortex due to a pressure difference between the high velocity airflow and the slow airflow. Is refined. For this reason, in order to refine | miniaturize a bubble, a quick airflow is required.
However, in the apparatus 1, since the gap 5 is on the entire outer peripheral surface of the inner cylinder 3, the gas spreads over the entire outer peripheral surface of the inner cylinder 3 and is supplied to the mixing region. For this reason, depending on the state of the fluid and the installation conditions, there is a possibility that the speed of the air current cannot be increased and the bubbles cannot be refined.
The present invention solves such problems, and an object thereof is to provide a gas-liquid mixing apparatus that can effectively prevent clogging and increase the speed of the air flow to achieve excellent micronization of bubbles. And

  The above-mentioned problem has a cylindrical outer cylinder and an inner cylinder in which a through hole is formed along a central axis, and the outer cylinder has a plurality of protrusions on the downstream side of the inner surface, The gas-liquid mixing device is arranged to be accommodated in the outer cylinder at a distance from the inner surface on the upstream side of the region where the protrusion is disposed, A plurality of protrusions projecting from the outer cylinder and / or the inner cylinder are disposed on the downstream side of the air outlet so as to close the gap, and the air outlet for supplying gas faces. The portion includes an upstream upstream convex portion and a downstream convex portion formed downstream of the upstream convex portion, and the upstream convex portion becomes wider from the upstream side toward the downstream side. In contrast, the width of the downstream convex portion becomes narrower from the upstream side toward the downstream side. Ri, the protrusion is solved by the gas-liquid mixing device is disposed downstream of the downstream convex portion.

According to the gas-liquid mixing apparatus, the outer cylinder and the inner cylinder are provided, and the inner cylinder is located in the outer cylinder at a distance from the inner surface at an upstream side of the region where the protrusions on the inner surface of the outer cylinder are disposed. It is accommodated, and a blower opening for supplying gas faces the gap space formed by the interval. For this reason, the gas supplied from a blower opening passes through the gap space which is the outer side of an inner cylinder, and is sent to the downstream side with a projection part in an outer cylinder. In addition, as the gas flows downstream, the liquid is drawn into the inner side of the cylindrical inner cylinder in which a through hole is formed along the central axis, and the downstream side where the protrusion in the outer cylinder is located. Sent to.
In this way, both the gas and the liquid are sent to the downstream side in the outer cylinder, but since there are a plurality of projections there, the gas hits the projections to become fine bubbles and mixes with the liquid. Fit. That is, the region where the protrusions in the outer cylinder are located is a mixed region where the generated bubbles and liquid are mixed. Then, the liquid flows inside the inner cylinder and the gas flows outside the inner cylinder in the same direction to the mixing region through different paths. Therefore, at the time of driving, the liquid flows in the opposite direction and does not enter the gas path (that is, the gap space), and clogging can be prevented.

Here, since the gas flows over the entire outer circumference of the inner cylinder constituting the gap space and flows into the mixing region, there are places where the speed of the airflow cannot be increased depending on the installation state or the like. In particular, in order to prevent clogging, it is preferable to increase the space in the inner cylinder and allow the liquid to pass smoothly. For this reason, the inner cylinder is a thick tube. If it does so, the gas sent from a ventilation port will pass the big outer surface of an inner cylinder, and there exists a possibility that the speed | rate of an airflow may become slow.
However, in the present invention, in the gap space, a plurality of protrusions protruding from the outer cylinder and / or the inner cylinder are arranged on the downstream side of the air blowing port so as to close the gap, and upstream of the protrusions. The upstream convex portion on the side increases in width from the upstream side toward the downstream side. If it does so, the width | variety will become narrow as the distance of the some upstream convex part adjacent to each other goes to the downstream from the upstream. Accordingly, the gas increases the velocity of the airflow as it goes from the upstream side to the downstream side, whereby the gas strikes the protrusions vigorously and effectively exerts a peeling effect, thereby effectively miniaturizing the gas.

Further, since the protrusion is arranged downstream of the downstream protrusion formed downstream of the upstream protrusion, the narrow path and the protrusion where the gas passage is narrowest by the upstream protrusion. A predetermined space is provided between the two. For this reason, it is possible to prevent a situation in which the airflow that has become faster in the narrow road directly collides with the protrusions, disturbs the airflow in the vicinity of the narrow road, and decreases the speed of the airflow.
And since the width | variety of a downstream convex part becomes narrow as it goes downstream, the gas path | route between the some downstream convex parts which adjoin mutually mutually spreads conversely as it goes downstream. Therefore, the downstream convex portion does not disturb the airflow in the vicinity of the narrow path, and a part of the gas flows along the downstream convex portion, and the once narrowed airflow is expanded. For this reason, it can guide | invade so that gas may spread over the whole mixing area | region where the projection part is arrange | positioned. Therefore, a large number of protrusions can be provided over the entire inner surface of the outer cylinder, and fine bubbles can be generated at a number of locations.

Preferably, the end surface on the downstream side of the inner cylinder is disposed in the vicinity of a narrow path where the distance between the plurality of adjacent convex portions is the narrowest.
Then, since there is no outer surface of the inner cylinder (also referred to as “outer peripheral side surface”) from the vicinity of the narrow path to the downstream side, it is possible to effectively prevent a situation in which the velocity of the airflow decreases near the outer surface of the inner cylinder due to viscosity. As described above, in this configuration, it is possible to achieve the problem of how to make the gas flow over the entire mixing region without dropping the flow velocity once increased at the upstream convex portion as much as possible.
If the end surface on the downstream side of the inner cylinder is arranged upstream of the vicinity of the narrow path, the air passage narrows in the width direction between the plurality of upstream protrusions, but the air passage in the thickness direction becomes narrower. Since the passage is widened and the airflow cannot be accelerated as expected, it is preferable that the end face on the downstream side of the inner cylinder is disposed near the narrow path.

  Preferably, both end surfaces in the width direction of the downstream convex portion are inclined surfaces in which the gas rising along the respective end surfaces of the both end surfaces is joined. Therefore, even if the airflow decreases in the vicinity of the end face in the width direction of the downstream convex portion due to the viscosity, the airflow merges on the downstream side, and the speed can be increased again.

  Preferably, the protrusion is arranged corresponding to a narrow path in which the distance between the plurality of adjacent convex portions is the narrowest, or the position where the protrusions meet, thereby being fast. Air bubbles can be effectively applied to the protrusions to generate fine bubbles.

Preferably, the outer cylinder and the inner cylinder are separately detachable, the plurality of convex portions are provided on an outer surface of the inner cylinder, and the outer cylinder is exposed to the outside. It has a cylindrical main body and a ring-shaped portion provided on the inner surface of the outer cylindrical main body, and the protrusion is disposed on the inner surface. The outer cylindrical main body and the ring-shaped portion are detachable separate bodies. And when the inner cylinder and the ring-shaped part are accommodated in the outer cylinder main body, the upstream end of the ring-shaped part and the downstream end of the downstream convex part come into contact with each other It is characterized by.
Then, in the worst case where maintenance is necessary, the outer cylinder and the inner cylinder are detachable separate parts, so that the gap between the outer cylinder and the inner cylinder is disassembled. Maintenance for the space becomes easy. At this time, since the plurality of convex portions are provided on the outer surface of the inner cylinder, the maintenance is easy as compared with the case where the convex portions are provided on the inner side of the outer cylinder.
Moreover, since the outer cylinder main body and ring-shaped part which comprise an outer cylinder are also a separate body which can be attached or detached, this can be decomposed | disassembled and the protrusion part provided many can be maintained easily.
And even if each part is made a separate body in this way, when combined, the upstream end of the ring-shaped part and the downstream end of the downstream convex part come into contact with each other. It is possible to secure a space between the narrow path where the distance between the convex portions is the narrowest and the protrusion, and to prevent the turbulence of the air current in the vicinity of the narrow path.

  As described above, according to the present invention, it is possible to provide a gas-liquid mixing apparatus that can effectively prevent clogging and increase the speed of the air flow to achieve excellent micronization of bubbles.

The schematic perspective view which shows preferable embodiment of the gas-liquid mixing apparatus of this invention. The top view of the gas-liquid mixing apparatus of FIG. The bottom view of the gas-liquid mixing apparatus of FIG. FIG. 3 is a cross sectional view taken along the line A-B-C in FIG. The conceptual diagram of the convex part near the ventilation opening of FIG. 4, and the projection part vicinity adjacent to this. The disassembled perspective view of the gas-liquid mixing apparatus of FIG. Schematic of the conventional gas-liquid mixing apparatus.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
The embodiments described below are preferred specific examples of the present invention, and thus various technically preferable limitations are given. However, the scope of the present invention is particularly limited in the following description. Unless otherwise stated, the present invention is not limited to these embodiments.
1 is a schematic perspective view showing a preferred embodiment of a gas-liquid mixing apparatus 10 of the present invention, FIG. 2 is a plan view thereof, FIG. 3 is a bottom view thereof, and FIG. 4 is a sectional view taken along the line A-B-C in FIG. It is. In FIG. 1, for convenience of understanding, a part of the outer cylinder is notched and illustrated, but there is no notch on the outer peripheral side surface of the outer cylinder.

  The gas-liquid mixing apparatus (hereinafter referred to as “the present apparatus”) 10 in these drawings includes, for example, a treatment tank as an aeration nozzle for a sludge method, an aeration nozzle for various contact carrier filling tanks, a stirring apparatus for neutralization reaction, and the like. It can be used in a liquid to refine the gas to dissolve oxygen in the liquid and stir the inside of the treatment tank, and is also referred to as a gas-liquid mixing and circulation device, a diffuser tube, or the like. In addition, as shown in FIG. 1, this apparatus 10 is installed so that the discharge port which becomes the discharge port of the mixed gas and the liquid is on the upper side, the upper side in FIGS. 1 and 4 is the downstream side, and the lower side is the upstream side. It becomes.

[Outline of this device]
First, the outline | summary of this apparatus 10 is demonstrated, referring FIG.1 and FIG.4.
As shown in FIG. 4, the apparatus 10 includes an outer cylinder 11 and an inner cylinder 12 that are formed with a through hole along the central axis BB and are generally cylindrical.
The inner cylinder 12 is shorter and smaller in outer diameter than the outer cylinder 11, and is accommodated at a predetermined interval W1 from the inner surface 11b of the outer cylinder 11 on the upstream side in the outer cylinder 11. This interval W1 is the interval of the passage of gas sent from a gas supply device (not shown) such as a blower. The interval W1 between the inner surface 11b of the outer cylinder 11 and the outer surface 12a of the inner cylinder 12 is small, and the interval W1 in this embodiment is about 5 mm. In this way, the interval W1 becomes the gap space S1, which can be called a gap, and the flow velocity of the gas passing therethrough is increased.

The inner cylinder 12 is not disposed on the downstream side in the outer cylinder 11, and is a mixed region S <b> 2 in which gas and liquid are mixed, and the gas sent from a gas supply device such as a blower has a narrow gap. It passes through the space S1 and jets into the mixing region S2 above it.
On the other hand, the inner space surrounded by the inner cylinder 12 is a liquid passage S3 through which liquid passes, and is spatially connected to the mixing region S2. Then, due to the rising force of the gas passing through the gap space S1, the liquid is drawn from the opening 25a on the upstream side of the inner cylinder 12, and enters the mixing region S2 through the liquid passage S3 and the opening 25b on the downstream side. It will be.
In this way, the gas passes through the gap space S1 outside the inner cylinder 12 to the mixing area S2, and the liquid passes through the liquid passage S3 inside the inner cylinder 12 to the mixing area S2, respectively (the same direction (FIG. 4) and mixes in the mixing region S2. Then, the gas and liquid mixed in the mixing region S2 are discharged from the opening 20b on the downstream side.

  A plurality of protrusions 30 are evenly arranged on the inner surface 11 b exposed in the mixing region S <b> 2 of the outer cylinder 11. As a result, the air that has risen in the gap space S1 along the inner surface 11b of the outer cylinder 11 strikes the plurality of protrusions 30 and branches, and exhibits a peeling effect, thereby generating finer bubbles. Therefore, in the mixed region S2, the finely divided bubbles are melted in the liquid, and high oxygen dissolution efficiency can be realized.

[About outer cylinder 11]
Next, the outer cylinder 11 and the like will be described.
Since the outer cylinder 11 is used in a liquid, it is preferable that the outer cylinder 11 is formed of a resin such as polypropylene which is not easily rusted or a metal such as stainless steel. The outer cylinder 11 of the present embodiment has a large cross-sectional area of the through-hole 20 along the central axis (BB in FIG. 4), the upstream side thereof serves as a housing space for the inner cylinder 12, and the downstream side serves as the mixing region S2. Become.

In the region where the inner cylinder 12 of the outer cylinder 11 is disposed, and on the upstream side thereof, as shown in FIG. 4, an air blowing port 16 penetrating in the thickness direction of the peripheral side surface 11a opens toward the gap space S1. ing. The blower port 16 is a hole for supplying air to the gap space S <b> 1 and is connected to the inner space of the tubular member 22 protruding from the peripheral side surface 11 a of the outer cylinder 11. An end portion of the tubular member 22 has a spiral groove 22a. By screwing a pipe PP or the like into the groove 22a, the apparatus 10 can be attached to and detached from a gas supply device such as a blower. In addition, the opening area of the ventilation port 16 is about 3 cm < ² >, and the flow volume of the gas sent to the ventilation port 16 from a gas supply apparatus is about 150 liters per second in this embodiment.

A plurality of protrusions 30 are arranged on the downstream side of the inner surface 11b of the outer cylinder 11 (that is, the mixing region S2) as described above. The protrusions 30 will be described in detail.
The protrusion 30 has a droplet shape or an almond shape when viewed from the front in order to efficiently generate fine bubbles. That is, as shown in the enlarged view of the protrusion 30 surrounded by the alternate long and short dash line in FIG. 1, in the front view, the protrusion 30 is greatly curved with the upstream side 30b rounded. The downstream side 30a has an acute tapered shape, and a bending point is formed at a contact point 30c between the upstream side 30b and the downstream side 30a. Note that the protrusion 30 that is visible by cutting out the outer cylinder 11 in FIG. 1 (the protrusion 30 that is the object of the drawing surrounded by the one-dot chain line) is the inner surface in front of the outer cylinder 11 in FIG. It is the protrusion part which protruded from, Comprising: It has illustrated in the state which floated in the air.
In this way, the airflow that collided with the upstream side 30b of the protrusion 30 is branched into two, and further, the airflow AR1 whose speed decreases along the wall surface of the downstream side 30a of the protrusion 30 while facing the downstream side , It becomes easy to be separated from the air current AR2 in which the decrease in speed is not so much observed (that is, the peeling phenomenon is likely to occur). Therefore, fine bubbles are easily generated due to the difference in atmospheric pressure between the two air currents AR1 and AR2.
Further, as shown in FIG. 4, each protrusion 30 protrudes toward the central axis BB, and the protruding length L <b> 1 is such that the gas that has passed through the gap space S <b> 1 is effective (the peeling phenomenon described above). It is the length until collision (in order to effectively occur), and in the case of the figure, it is about 11 mm.

The plurality of protrusions 30 are stepped in the vertical direction so as to shift the phase in the circumferential direction of the inner surface 11 b of the outer cylinder 11. In FIG. 4, the plurality of protrusions 30 are upstream protrusions 30-1, downstream protrusions 30-3, and intermediate protrusions between the protrusions 30-1 and 30-3. 30-2. The middle protrusion 30-2 is positioned between two adjacent upstream protrusions 30-1 and 30-1, and the downstream protrusion 30-3 is adjacent to each other. Between the two adjacent middle projections 30-2 and 30-2, they are respectively arranged.
The plurality of protrusions 30 at each stage are arranged at equal intervals in the circumferential direction, and in the present embodiment, the above-described interval W1 and length L1, the speed of the airflow, the circumferential length of the inner surface 11b, and a later-described direction. The relationship with the convex portion 50 is comprehensively determined, and six are arranged at each stage.

[About inner cylinder 12 etc.]
Next, the inner cylinder 12 and the like will be described.
The inner cylinder 12 is formed of the same material as that of the outer cylinder 11 and is generally cylindrical. In particular, the inner surface 12b of the inner cylinder 12 has a circular shape with substantially the same radius r in any cross-sectional shape in the vertical direction, and the liquid passage S3 surrounded by the inner surface 12b is a straight passage.
Further, there are no protrusions inside the inner cylinder 12 that obstruct the flow of the liquid, and the radius r of the liquid passage S3, which is also the radius of the inner surface 12b, is formed as large as about 25 mm in the figure, Has been.
In this way, a large amount of liquid smoothly passes through the liquid passage S3.

The inner cylinder 12 is detachably connected to the outer cylinder 11 at the upstream end. Specifically, a flange-like portion 14 extending in the horizontal direction is formed at the upstream end portion of the inner cylinder 12, and a hole continuous to the flange-like portion 14 and the outer cylinder 11 is formed. A connecting member 49 such as a pin or a screw is inserted into and connected.
As shown in FIGS. 1 and 3, a part of the hook-shaped portion 14 of the present embodiment is a notch-shaped portion 14 a. The shaded portion in FIG. 3 is shown for convenience of understanding, and represents the opening 20a exposed from the notch 14a of the bowl-like portion 14, and this unopened opening 20a is It is connected to the gap space S1 shown in FIG. In addition, although the notch-shaped part 14a of FIG. 3 is made into three places at equal intervals, this invention is not limited to this.

  The above-described hook-like portion 14 maintains the interval W1 of the gap space S1 shown in FIG. 4 (the interval W1 in the drawing is the same in any part), and in the driving state in which air is supplied to the apparatus 10, the liquid Is effectively prevented from entering the gap space S1. That is, when the apparatus 10 is driven, the pressure in the narrow gap space S1 is increased, so that the liquid enters the gap space S1 from a part of the opening 20a that is not blocked by the flange-like member 14. There is nothing. Further, when the apparatus 10 is not driven, when sludge or the like enters the gap space S1 through the upper opening 20b and the mixing region S2, the opening 20a that is not blocked (that is, a notch shape). The sludge can be removed from the part 14a).

Here, as shown in FIGS. 1 and 4, the gap space S <b> 1 has a plurality of protrusions protruding from the outer cylinder 11 and / or the inner cylinder 12 so as to close the gap W <b> 1 on the downstream side of the air blowing port 16. Part 50 is arranged. In the case of the figure, a plurality of convex portions 50 protrude from the inner cylinder 12 toward the inner surface 11 b of the outer cylinder 11. The convex portion 50 will be described mainly with reference to FIG. 5 with reference to FIGS. 1 and 4 as appropriate.
FIG. 5 is a conceptual diagram of the vicinity of the protrusion 50 near the air outlet 16 and the protrusion 30 adjacent to the protrusion 50. In FIG. 5, only the protruding portion 30 is left (floating in the air), and the outer peripheral side surface of the outer cylinder 11 is cut in half vertically. Moreover, the ring-shaped part 63 (refer FIG. 6) which is a component of the outer cylinder 11 is abbreviate | omitted and illustrated.
The convex portions 50 in the figure are arranged at equal intervals at four locations near the downstream end portion of the inner cylinder 12. The main surface 50a of the convex portion is a curved surface corresponding to the shape of the inner surface 11b of the outer cylinder 11, and the thickness (projecting width) D of the convex portion 50 is made to be in contact with the inner surface 11b in the same manner as the interval W1. It has become. Thereby, the inner cylinder 12 is positioned by both the convex part 50 and the collar part 14 of the upstream edge part shown in FIG. 4, and the space | interval W1 of gap | interval space S1 is hold | maintained.

And each convex part 50 consists of the upstream convex part 51 of the upstream, and the downstream convex part 52 formed in the downstream from this upstream convex part 51, and the upstream convex part 51 is downstream from the upstream. While the width W2 gradually increases toward the side, the downstream convex portion 52 has a width W3 that gradually decreases from the upstream side toward the downstream side. Here, the upstream and downstream are relative to each other. Further, the upstream convex portion 51 and the downstream convex portion 52 are integrally formed.
The convex portion 50 in the figure is shaped so that the frontal view has a flat surface 50c by cutting the upper end of a substantially diamond shape or rhombus in the horizontal direction.
Specifically, both end surfaces 51a and 51a in the width direction of the upstream convex portion 51 (the main surface 50 of the present embodiment is a curved surface corresponding to the inner surface 11b and are also referred to as the circumferential direction) are both angle θ1 with respect to the horizontal direction. Is inclined to be about 50 degrees. Further, both end surfaces 52a and 52a in the width direction of the downstream convex portion 52 (the main surface 50 of the present embodiment is a curved surface corresponding to the inner surface 11b and therefore also referred to as a circumferential direction) have an angle θ2 with respect to the horizontal direction of about 55. It is inclined to be a degree.

  The plurality of convex portions 50 are configured as described above. For this reason, the distance W4 between the upstream convex portions 51 and 51 adjacent to each other gradually becomes narrower from the upstream side toward the downstream side. Therefore, the airflow AR3 sandwiched between the upstream convex portions 51 and 51 adjacent to each other increases in speed from the upstream to the downstream side, and accordingly, the protrusion 30α corresponding to the distance W4 (particularly, the plurality of adjacent protrusions 30α). The projections 51 and 51 project the projections 30α facing the narrow path NR where the distance between the projections 51 and 51 is the narrowest, and effectively exert a peeling effect as shown in the diagram surrounded by the one-dot chain line in FIG. Thus, fine bubbles can be generated.

  The protrusion 30 is disposed further downstream than the downstream end (the flat surface 50c in the present embodiment) of the downstream protrusion 52, and a predetermined distance L2 is provided between the narrow path NR and the protrusion 30. Is provided. In this embodiment, the distance L2 is set to about 16 mm. For this reason, by arranging the protrusion immediately above the narrow path NR, the accelerated airflow directly collides with the protrusion, disturbing the airflow near the narrow path NR, and the speed of the airflow decreases. This situation is effectively prevented.

A part of the airflow AR3 passing through the narrow path NR becomes an airflow AR4 rising along the end surface 52a of the downstream convex portion 52 due to viscosity. Then, since the end surface 52a of the downstream convex portion 52 is inclined so that the width W3 of the downstream convex portion 52 becomes gradually narrower from the upstream side toward the downstream side, the air flow AR4 is along the inclined end surface 52a. Is expanded in the width direction (circumferential direction in the present embodiment), and the airflow AR4 can be effectively applied to the protrusion 30β that does not correspond to the distance W4.
Furthermore, both end surfaces 52a and 52a in the width direction of the downstream convex portion 52 in the figure are inclined surfaces that allow the airflows AR4 and AR4 that have risen along each of them to join. Therefore, even if the airflow AR4 drops in the vicinity of the end face 52a due to viscosity, the two airflows AR4 and AR4 merge on the downstream side and increase the speed again. Then, a protrusion 30β is arranged corresponding to the position where the two airflows AR4 and AR4 merge (in the case of the figure, at the position where the two airflows merge), and thereby the airflow that has become faster after the merge is transferred to the protrusion 30β. By applying this, fine bubbles can be generated.
In FIG. 5, the upper end portion of the downstream convex portion 52 is a horizontal flat surface 50 c, but the present invention is not limited to such a shape, and is formed so that the frontal view is a substantially triangular shape. The substantially triangular downstream apex may correspond to the protrusion 30β.

Furthermore, it is preferable that the downstream end surface (upper end surface of the cylindrical portion excluding the convex portion 50 in the drawing) 12c of the inner cylinder 12 is disposed in the vicinity of the narrow path NR (in other words, the downstream convex portion 52 is It is preferable that the protruding portion protrudes downstream from the end surface 12c of the inner cylinder 12). Accordingly, only the downstream convex portion 52 exists on the downstream side from the vicinity of the narrow path NR within the range of the distance L2, and the outer surface 12a of the inner cylinder 12 does not exist. Therefore, the air current is near the outer surface 12a of the inner cylinder 11 due to viscosity. It is possible to effectively prevent a situation where the speed is reduced.
In addition, it is not preferable to arrange this end surface 12c in the up-down direction (Y direction in FIG. 5) upstream from the vicinity of the narrow path NR. When arranged on the upstream side of the vicinity of the narrow path NR, the air passage is narrowed in consideration of the width direction (the X direction in FIG. 5) between the plurality of adjacent upstream convex portions 51 and 51, but the thickness direction ( This is because the air passage is widened in the Z direction in FIG. 5 and cannot be strengthened as desired.

  Further, as shown in FIG. 5, each narrow path NR formed by a plurality of convex portions 50 (in this embodiment, since there are four convex portions 50 as shown in FIG. 6, there are four narrow path NRs). In order to effectively spread the airflow from the blower port 16, between the two upstream convex portions 51, 51 adjacent to the blower port 16, a protruding portion is formed on the outer surface 12 a of the inner cylinder 12. 27 is provided. As shown in the enlarged view of the vicinity of the protrusion 27 surrounded by a two-dot chain line in FIG. 5, the protrusion 27 is formed to have a width W5 larger than the height h1 in the vertical direction, and gas passes through both sides. Space S5 is secured. Further, the tip end surface 27 a has a thickness D <b> 2 so as to contact the inner surface 11 b of the outer cylinder 11.

The present embodiment is configured as described above, and the flow rate of the gas is controlled by the arrangement of the plurality of convex portions 50, the position of the end surface 12c of the inner cylinder 12, the protruding portion 27, and the protruding portion 30 spaced from the narrow path NR by the distance L2. While speeding up, the air current was made to flow around the entire circumference of the mixing region S2.
Further, in the present embodiment, the outer cylinder 11 and the inner cylinder 12 can be disassembled to enable maintenance assuming the worst state.
Hereinafter, this decomposition function will be described mainly with reference to FIG. 6 with reference to FIG. 4 as appropriate.

[Disassembly function of the device 10]
FIG. 6 is an exploded perspective view of the apparatus 10. In FIG. 6, for convenience of understanding, a part of an outer surface 63 c of a ring-shaped portion 63 described later is cut away to show a side cross section.
As shown in FIG. 6, the outer cylinder 11 and the inner cylinder 12 are detachable separate bodies, and the outer cylinder 11 is also formed by combining a plurality of members.
First, the configuration of the outer cylinder 11 will be described.
The outer cylinder 11 includes an outer cylinder main body 61 and a ring-shaped portion 63 exposed to the outside.
The outer cylinder main body 61 has the long rail part 19 along the up-down direction in the inner surface 61a. Further, as shown in FIG. 4, a downward stepped portion 55 is formed on the entire inner surface 61a of the upper end portion 61b of the outer cylinder main body 61 (which becomes a downstream end portion when installed). .

The ring-shaped part 63 of FIG. 6 can be accommodated inside the outer cylinder main body 61, and the outer surface 63 c comes into contact with the inner surface 61 a of the outer cylinder main body 61 when accommodated.
The plurality of protrusions 30 described above are formed on the inner surface 63a of the ring-shaped portion 63 (the inner surface 63a becomes the inner surface 11b of the outer cylinder 11 in FIG. 4). The ring-shaped portion 63 is composed of a plurality, and in the case of this embodiment, three ring-shaped portions 63 are used, and when they are accommodated in the outer cylinder main body 61, as shown in FIG. Part 63-1, an upstream ring-shaped part 63-3, and a middle ring-shaped part 63-2 between the ring-shaped part 63-1 and the ring-shaped part 63-3.
Further, on the outer surface 63c of the ring-shaped portion 63 in FIG. 6, an upward stepped portion 56 is formed on the upper end portion 63b over the entire circumference, and a groove 44 is formed along the vertical direction.
Further, a downward stepped portion 70 is formed at the lower end 63 d of the inner surface 63 a of the ring-shaped portion 63.

The outer cylinder main body 61 and the ring-shaped portion 63 of the present embodiment are configured as described above, and the three ring-shaped portions 63 are placed under the outer cylinder main body 61 so that the groove 44 and the rail portion 19 are locked. If it inserts in order from the opening part 20a of the side, it can arrange | position, preventing the rotation of the ring-shaped part 63 in the circumferential direction. As a result, as shown in FIG. 4, projections 30-1, 30-2, and 30-3 that are stepped in the vertical direction are formed so as to shift the phase in the circumferential direction of the inner surface 11 b of the outer cylinder 11. The
Further, as shown in FIG. 4, the downward stepped portion 55 of the outer cylinder main body 61 and the upward stepped portion 56 of the downstream ring-shaped portion 63-1 collide with each other so that the ring-shaped portion 63-1 is outside. The cylinder main body 61 is prevented from coming off.
Further, as shown in FIG. 4, the lower end portion of the ring-shaped portion 63-1 and the upper end portion of the ring-shaped portion 63-2 below the step-like portions 56 and 70 are formed so as not to wobble. Is in contact with

Next, the attachment / detachment structure of the outer cylinder 11 and the inner cylinder 12 will be described.
The inner cylinder 12 has the above-described configuration. As shown in FIG. 6, the plurality of convex portions 50 protrude from the outer surface 12 a and have a bowl-shaped portion at the lower end (upstream end when installing). 14. A groove 14b is formed in the bowl-shaped portion 14 along the vertical direction. Moreover, the hole 14c is opened in the flange-shaped part 14 along the overhanging direction.
On the other hand, on the inner surface 61a of the outer cylinder main body 61, the elongate rail portion 19 is provided along the vertical direction as described above. The rail portion 19 is formed on the opposite side of the air blowing port 16. Further, a through hole 28 penetrating in the thickness direction is formed at the lower end portion of the outer cylinder main body 61.

Therefore, as described above, after the plurality of ring-shaped parts 63 are sequentially inserted from the lower opening 20a of the outer cylinder main body 61, the inner cylinder 12 is locked to the groove 14b and the rail part 19. Then put it in the same way. Thereby, the inner cylinder 12 is prevented from rotating in the circumferential direction, and a favorable arrangement relationship between the convex portion 50 and the protruding portion 30 is determined as shown in FIG. Moreover, the rail part 19 of FIG. 6 passes between the two convex parts 50 and 50 (the front side and the right side of FIG. 6) farthest from the air outlet 16 in the vertical direction. Note that the rail portion 19 is not so large as to block the narrow path NR. On the contrary, the air flow in the narrow path NR farthest from the blower port 16 can be accelerated.
Then, as shown in FIG. 4, a connecting member 49 such as a pin or a screw is continuously inserted from the through hole 28 (see FIG. 6) of the outer cylinder main body into the hole 14c (see FIG. 6) of the bowl-shaped portion 14. Then, the inner cylinder 12 is fixed as shown in FIG.
Then, as shown in FIG. 4, the downstream end portion (flat surface) 50c of the downstream convex portion 52 comes into contact with the upstream end portion (lower end portion in FIG. 6) 63d of the ring-shaped portion 63-3, and the ring Thus, the distance L2 between the narrow path NR and the protrusion 30 shown in FIG. 5 can be maintained.

  Since the present apparatus 10 is configured as described above and the outer cylinder 11 and the inner cylinder 12 are detachable separate bodies, the apparatus can be disassembled to facilitate maintenance of the narrow gap space S1. Moreover, since the outer cylinder main body 61 and the ring-shaped part 63 are also a detachable separate body, it can be disassembled and maintenance of the many projecting parts 30 provided can be facilitated. And even if each site | part is made into a separate body in this way, the space between the narrow path NR and the projection part 30 can be ensured, and the disturbance of the airflow near the narrow path NR can be prevented.

By the way, the present invention is not limited to the above-described embodiments, and various modifications and changes can be made to the present invention, and various modifications can be made within the scope described in the claims.
For example, although the convex part 50 protrudes from the inner cylinder 12 in this embodiment, it may be a convex part protruding from the outer cylinder 11, or may protrude from both the outer cylinder 11 and the inner cylinder 12.
In addition, the protrusion 30 is not limited to the above-described embodiment, and the number and arrangement are appropriately set according to the nature of the gas or liquid, the size of the gas-liquid mixing device, and the shape thereof is also It may be a mushroom shape, a substantially hemispherical shape, a substantially cylindrical shape, a substantially prismatic shape, a substantially conical shape, a substantially pyramidal shape, or the like.
Further, in the present embodiment, in order to facilitate maintenance, the members 61, 63, and 12 shown in FIG. 6 can be separated in order to facilitate maintenance. However, the present invention replaces the members 61, 63, and 12 with each other. You may form integrally.

  DESCRIPTION OF SYMBOLS 10 ... Gas-liquid mixing apparatus, 11 ... Outer cylinder, 12 ... Inner cylinder, 16 ... Blower, 30 ... Projection part, 50 ... Convex part, 51 ... Upstream convexity Part, 52 ... downstream convex part, S1 ... gap space, NR ... narrow path

Claims (5)

A cylindrical outer cylinder and an inner cylinder each having a through hole formed along a central axis; the outer cylinder having a plurality of protrusions on a downstream side of an inner surface thereof; and the inner cylinder includes the protrusions Is a gas-liquid mixing device that is accommodated in the outer cylinder at a distance from the inner surface on the upstream side of the region where
In the gap space formed by the gap, a blower port for supplying a gas faces, and a plurality of protrusions projecting from the outer cylinder and / or the inner cylinder so as to close the gap on the downstream side of the blower port. Are arranged,
The convex portion is composed of an upstream convex portion on the upstream side and a downstream convex portion formed downstream from the upstream convex portion,
The upstream convex portion is wider in width from the upstream side toward the downstream side, whereas the downstream convex portion is narrower in width from the upstream side toward the downstream side,
The gas-liquid mixing device, wherein the protrusion is disposed downstream of the downstream protrusion.   2. The gas-liquid mixing device according to claim 1, wherein an end face on the downstream side of the inner cylinder is disposed in the vicinity of a narrow path where a distance between the plurality of adjacent convex portions is the narrowest.   The both end surfaces in the width direction of the downstream convex portion are inclined surfaces that allow the gas rising along the respective end surfaces of the both end surfaces to merge. Gas-liquid mixing device.   The gas-liquid mixing according to claim 3, wherein the protrusion is disposed corresponding to a narrow path in which a distance between the plurality of adjacent convex portions is the shortest or the position where the protrusions meet. apparatus. The outer cylinder and the inner cylinder are detachable separate bodies,
The plurality of convex portions are provided on the outer surface of the inner cylinder,
The outer cylinder includes an outer cylinder main body exposed to the outside, and a ring-shaped portion provided on the inner side of the outer cylinder main body, the protrusion being disposed on the inner surface, and the outer cylinder main body and the ring-shaped main body. It is considered as a separate body that can be attached and detached,
When the inner cylinder and the ring-shaped part are accommodated in the outer cylinder main body, the upstream end of the ring-shaped part and the downstream end of the downstream convex part come into contact with each other. The gas-liquid mixing device according to any one of claims 1 to 4.

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