JP4706665B2 - Microbubble generator - Google Patents

Description

  The present invention relates to a fine bubble generating apparatus that is most suitable for a watering facility.

Conventionally, the gas-liquid dissolved fluid, in which gas is pressurized and dissolved in the liquid, is released by the decompression means, and ejected and discharged from the discharge nozzle into the bathtub (an example of a watering facility) while generating fine bubbles. There exists a fine bubble generator (refer patent document 1).
JP-A-11-33071

  When the fine bubble generator as described above is applied to a bathtub that is a watering facility, it is necessary to install the fine bubble generator in a narrow space such as a gap between the bathtub and the apron. There is a desire to greatly increase the amount of microbubbles generated with a simple configuration without using a route.

  The present invention has been made to meet the above-mentioned demand, and an object of the present invention is to provide a microbubble generator capable of improving the cloudiness by greatly increasing the amount of microbubbles generated with a simple configuration. It is what.

In order to solve the above problems, the present invention includes an electric pump, a gas dissolving device connected to the electric pump, and a decompression unit connected to the gas dissolving device, and the gas dissolving device is connected to the electric pump. The gas is dissolved in the liquid under pressure by the gas dissolving device to form a gas-liquid dissolving fluid, and the gas-liquid dissolving fluid in which the gas is pressurized and dissolved in the liquid is released by the decompression means. Te, a fine bubble generating device for ejecting the ejection from the ejection nozzle while generating fine bubbles, to the discharge nozzle, the pressure reducing means is provided, the pressure reducing means is formed of a venturi tube, the interior of the venturi The present invention provides a microbubble generator characterized in that vortex generating means for generating a vortex in a part of the gas-liquid dissolving fluid flowing through the venturi tube is provided.

  According to a second aspect of the present invention, it is preferable that the eddy current generating means is an edge for generating a vortex that protrudes from the inner peripheral wall of the venturi tube in the circumferential direction of the venturi tube and protrudes toward the inner peripheral side. .

  According to a third aspect of the present invention, it is preferable that the front surface on the upstream side of the edge for generating eddy currents is an inclined surface inclined toward the downstream side.

  According to a fourth aspect of the present invention, it is preferable that the eddy current generating edge is composed of a plurality of elements arranged at a distance in the axial direction of the venturi tube.

  According to the first aspect of the present invention, the gas-liquid dissolving fluid flowing through the venturi tube is released from the pressure to generate bubbles from the gas-liquid dissolving fluid, and the generated bubbles can be split. In addition, the vortex generation means can cause vortex flow in the gas-liquid dissolved fluid flowing through the venturi tube, and can generate bubbles by the low pressure part formed along with the vortex flow, and the vortex flow is formed by the venturi tube. Bubbles can be crushed and split. Thereby, a large number of fine bubbles can be formed by the venturi tube and the vortex generating means.

  Therefore, for example, when bubbles are generated only with a venturi tube and fine bubbles are formed on the basis of the bubbles, it is possible to prevent such cases that the number of fine bubbles is insufficient and difficult to be sufficiently clouded. A sufficient number of bubbles can be easily obtained.

  According to the invention of claim 2, the eddy current generating means is formed from the eddy current generating edge projecting on the inner peripheral side so as to extend to the inner peripheral wall of the venturi tube with a predetermined length along the circumferential direction. Therefore, the eddy current generating means can be simply configured and can be easily formed at low cost.

  According to the invention of claim 3, the upstream front surface of the eddy current generating edge is formed of an inclined surface inclined to the downstream side, so that, for example, the upstream front surface is viewed from a right angle surface substantially perpendicular to the axial direction. Compared with the case where it comprises, the pressure concerning the gas-liquid dissolution fluid which flows through a venturi pipe can be made small, and a vortex | eddy_current can be produced | generated while flowing gas-liquid dissolution fluid smoothly, and it can be made efficient.

  According to the fourth aspect of the present invention, bubbles can be formed along with the formation of the vortex flow by each of the plurality of eddy current generation edges arranged at a distance in the axial direction of the venturi tube, and the venturi can be formed by the vortex flow. It is also possible to break up the bubbles formed by the tube and break them into smaller bubbles. Therefore, more bubbles can be formed easily and efficiently.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a basic configuration diagram of a microbubble generator that generates microbubbles in bath water in a bathtub 1, for example, and a suction port 2 and a discharge port 3 are provided on the inner surface of the bathtub 1. An air inlet 4 is provided in the flange portion.

  The suction port 2 is connected to the suction side of the electric pump 6 via the connecting pipe 5, and the discharge side of the electric pump 6 is connected to the suction side injection port 9 of the gas dissolving device 8 via the inflow pipe 7. . The outlet 10 on the discharge side of the gas dissolving device 8 is connected to one end of a venturi pipe 12 serving as a pressure release portion via an outflow pipe 11, and the other end of the venturi pipe 12 is connected to the side surface of the bathtub 1 via a connection pipe 13. Is connected to the discharge port 3 installed in the. The air suction port 4 is connected to a connection pipe 5 near the inlet side of the electric pump 6 via a connection pipe 14, and a check valve 15 is provided in the connection pipe 14.

  As shown in detail in FIG. 2 and FIG. 3, the gas dissolving device 8 includes a side wall portion 21 having a straight cylindrical shape with a circular cross section, and end wall portions 22 that close both ends of the side wall portion 21. The center axis A (see the one-dot chain line in FIG. 2) of the side wall portion 21 which is configured by the tank-like cylindrical body 23 and has a substantially cylindrical shape is 10 in the horizontal direction (see the arrow in FIG. 2). It arrange | positions with the attitude | position which inclines with the inclination angle (theta) of -45 degree | times.

  The cylindrical body 23 in this inclined posture has an upper end serving as an upstream A end, and a lower end serving as a downstream B end. An injection port 9 for injecting into the cylindrical body 23 is formed, and an outflow port 10 through which liquid flows out from the cylindrical body 23 is formed on the downstream side B.

  In the cylindrical body 23, a gas such as air, which becomes a solute, and a liquid such as water, which becomes a solvent, are stored, and is approximately in the vicinity of the vertical center of the substantially cylindrical side wall portion 21. The interface 24 between the gas and the liquid is located, and the portion on the upstream side A above the interface 24 becomes the gas storage portion 25 where the gas is stored, and the portion on the downstream side B from the interface 24 stores the liquid. The liquid storage part 26 is made.

  The injection port 9 is located on the inner wall surface of the gas reservoir 25 (the inner wall surface of the side wall 21 or the end wall 22 on the upstream side A from the interface 24), at a position near the interface 24, or slightly below the interface 24. It is formed on the inner wall surface of the liquid reservoir 26 (inner wall surface of the side wall 21 on the downstream side B from the interface 24), and the outlet 10 is located on the inner wall surface near the end of the liquid reservoir 26 (on the downstream side B of the interface 24). The inner wall surface of the side wall portion 21 or the end wall portion 22 is formed.

  An air vent 27 provided with a valve (not shown) is formed in the side wall 21 of the cylindrical body 23, and the gas and liquid reservoir 26 are stored in the gas reservoir 25 at the position of the air vent 27. It becomes the level of the interface 24 of the liquid stored in.

  Next, the operation of the gas dissolving device 8 will be described. When the same liquid and gas stored in the cylindrical body 23 are ejected from the ejection port 9, they collide with the inner wall surface on the upper side of the side wall portion 21 facing the ejection port 9 and bounce off the inner wall surface. The liquid collides with the liquid stored in the liquid reservoir 26 at the interface 24 and is agitated. Further, the liquid stored in the liquid storage unit 26 is not only stirred by the gas-liquid mixed fluid colliding with the interface 24, but also by the gas-liquid mixed fluid injected into the cylindrical body 23 from the injection port 9. Stir.

  As described above, the gas stored in the cylindrical body 23 and the like by the agitation due to the collision with the inner wall surface of the side wall portion 21 of the gas-liquid mixed fluid, the collision at the interface 24, the agitation of the liquid when being jetted, and the like The liquid, the gas in the gas-liquid mixed fluid, and the liquid are mixed, and dissolution of the gas into the liquid is promoted. That is, the bubbles (gas) mixed in the liquid are subdivided by shearing by mixing and stirring, and the total surface area in contact with the liquid is increased. In addition, the dissolved concentration of the gas near the interface between the liquid and the gas is increased. Since it is reduced by homogenization by mixing and stirring, and the dissolution rate of the gas in the liquid increases, dissolution of the gas in the liquid is promoted.

  The liquid in which the dissolution of the gas has progressed is stored in the liquid storage portion 26 of the cylindrical body 23, but many undissolved bubbles are mixed in the stored liquid, and these bubbles become denser as they go upward. There are few bubbles near the lower end of the liquid reservoir 26, and there are almost no large bubbles. Then, the dissolution of the gas proceeds, and the liquid at the lower end of the liquid storage part 26 in which there are almost no large bubbles flows out from the tubular body 23 through the outlet 10.

  FIG. 4 is a basic configuration diagram of the venturi tube 12. The venturi pipe 12 of the outflow pipe 11 has a two-stage configuration including one upstream venturi pipe 12a in the center and a plurality (five in the example of FIG. 4) downstream venturi pipes 12b.

  FIGS. 5 and 6 are microbubble generators embodying the basic configuration of FIGS. 1 to 4, and the same configuration as the basic configuration is denoted by the same reference numeral, and detailed description thereof is omitted.

  A discharge nozzle 30 is attached to the side wall 1 a of the bathtub 1, and the above-described suction port 2, discharge port 3, venturi pipe 12 (12 a, 12 b) and the like are incorporated into the discharge nozzle 30 as a unit.

  The discharge nozzle 30 is provided with an L-shaped nozzle case 31 in a side view, and an L-shaped flow path 31a following the outer shape is formed inside the nozzle case 31. The outflow pipe 11 is connected to the inlet side (vertical portion) via an O-ring 32.

  The flow path 31 a includes a bubble generation / breakup flow path 131 and a vaporization flow path 132 disposed on the downstream side of the bubble generation / breakup flow path. The bubble generation / division channel 131 is a channel for generating bubbles from the gas-liquid dissolving fluid and generating the divided bubbles by dividing the generated bubbles. The bubble generating / breaking flow path 131 is provided with an upstream venturi pipe 12a and a downstream venturi pipe 12b as decompression means, and a vortex generating means.

  The upstream side venturi tube 12 a is vertically installed in FIG. 6 on the inlet side of the bubble generating / breaking channel 131 by being fitted into the upper part of the nozzle case 31. In this embodiment, the downstream side venturi pipe 12b is composed of a plurality of pipes formed in the nozzle body 29. Then, when the nozzle body 29 is fitted in the middle of the nozzle case 31 via the O-ring 33, the downstream venturi pipe 12b is disposed laterally in FIG. 6 on the downstream side of the upstream venturi pipe 12a. ing.

  Specifically, as shown in FIGS. 6 and 13, the nozzle body 29 has a cylindrical fitting portion 29 a for fitting into the outlet side (sideways portion) portion of the nozzle case 31 via an O-ring 33, and this A cylindrical projecting portion 29b projecting downstream (discharging direction) from the fitting portion 29a and a plate-like closing portion 29c are formed between the cylindrical protruding portion 29b and the fitting portion 29a. Two inner and outer concentric circles are set, and a plurality of (six in this example) downstream venturi tubes 12b are formed along the inner small-diameter circle at equal angular intervals on the circumference. A plurality of (10 in this example) downstream venturi pipes 12b are formed at equal angular intervals on the circumference (a total of 16 downstream venturi pipes 12b in this example). The plurality of venturi tubes 12b can be referred to as a venturi tube group.

  The upstream venturi tube 12a and the downstream venturi tube 12b have an upstream inlet portion formed in an outward trumpet shape, and a shortest shortest straight portion formed immediately downstream thereof. In addition, a long taper portion whose diameter is increased from the upstream side toward the downstream side is formed.

  The vortex generating means is for causing a vortex in part of the gas-liquid dissolving fluid flowing through the venturi tubes 12a and 12b. The vortex generating means of this embodiment is composed of an eddy current generating edge 12c provided in the upstream venturi tube 12a, and causes vortex flow to occur in a part of the gas-liquid dissolved fluid flowing through the upstream venturi tube 12a. It has become.

  As shown in FIG. 7, the eddy current generating edge 12 c is formed on the inner peripheral wall near the center of the upstream end and the downstream end of the upstream venturi tube 12 a over the entire circumference along the circumferential direction. It protrudes radially inward (inner circumferential side).

  Further, the upstream front surface 12d of the eddy current generating edge 12c is inclined downstream at a predetermined angle with respect to a plane orthogonal to the axial direction of the upstream venturi tube 12a from the base end 12f to the protruding tip 12g. It is configured as follows. Further, the downstream rear surface 12e is configured to incline upstream from the base end 12h to the protruding tip 12g with a predetermined angle with respect to a plane perpendicular to the axial direction of the upstream venturi tube 12a.

  Next, returning to FIG. 6, the vaporization channel 132 will be described. The vaporization channel 132 is a channel for growing (enlarging) the split bubbles generated in the bubble generation / split channel 131 to form fine bubbles having an outer diameter necessary and sufficient for white turbidity.

  The vaporization flow path 132 of this embodiment is formed on the downstream side of the downstream venturi pipe 12b in the nozzle body 29 (left side portion in FIG. 6). Further, the vaporization flow path 132 promotes vaporization of the dissolved gas dissolved in the gas-liquid dissolution fluid by the vaporization promoting means, and while the split bubbles flow through the vaporization flow path 132 together with the gas-liquid dissolution fluid, It can be formed into microbubbles with an outer diameter that is necessary and sufficient for conversion.

  In this embodiment, the vaporization promoting means includes the flow path narrowing member 38 that narrows the flow path by making the flow path cross-sectional area at the downstream end of the vaporization flow path 132 smaller than the flow path cross-sectional area of the upstream side. Compared to the case where the flow path narrowing member 38 is not provided, this flow path narrowing member 38 slows down the flow rate of the gas-liquid dissolving fluid flowing through the vaporization flow path 132, so that the gas-liquid dissolved fluid The time for flowing through the vaporizing flow path 132 is lengthened.

  Specifically, a cylindrical holder 37 that extends downstream (in the discharge direction) is disposed at the discharge side end of the nozzle body 29, and the male screw 29 d at the front end of the protrusion 29 b of the nozzle body 29 is connected to the female screw of the holder 37. 37a is attached by screwing, and a flow path narrowing member 38 is provided on the inner peripheral side of the holder 37.

  As shown in FIGS. 6 and 14, the channel narrowing member 38 of this embodiment is formed in a plate-like portion 38a disposed substantially orthogonal to the axis of the holder 37, and the plate-like portion 38a. It consists of four openings 38b. Then, the flow path narrowing member 38 configured as described above causes the flow channel cross-sectional area of the downstream end of the vaporization flow path 132 formed inside the nozzle body 29 to be the entire opening of the flow path narrowing member 38. This corresponds to a cross-sectional area of 38b, and the downstream end of the vaporization channel 132 is narrower than the other part of the vaporization channel 132.

  The channel cross-sectional area at the discharge side end in the vaporization channel 132 is not particularly limited and can be changed as appropriate. It is preferable to be in the range of approximately 60 to approximately 90%, more preferably approximately 75%.

  Continuing the description of the discharge nozzle 30, a packing 40 having a U-shaped cross section is fitted into the mounting hole 1 b of the side wall 1 a of the bathtub 1, and the outlet side (sideways portion) of the nozzle case 31 from the outside of the bathtub 1. The flange portion 31b is applied to the packing 40, and the male screw 41a at the rear end portion of the cylindrical fixing flange 41 is screwed into the female screw 31c of the flange portion 31b of the nozzle case 31 from the inside of the bathtub 1 to thereby fix the fixing flange 41. The flange portion 41 b at the front end portion is in watertight contact with the packing 40, and the flange portion 31 b of the nozzle case 31 is in watertight contact with the packing 40. As a result, the nozzle case 31 is fixedly attached to the side wall 1 a of the bathtub 1 with the fixing flange 41.

  The nozzle cover 42 is attached to the flange portion 41 b of the fixed flange 41 by screwing the female screw 42 a at the rear end portion of the cylindrical nozzle cover 42 into the male screw 41 c of the flange portion 41 b of the fixed flange 41 from the inside of the bathtub 1. become. The nozzle cover 42 has the discharge port 3 formed therein.

  The fixed flange 41 is formed with a plate-like closing portion 41d that closes the outer peripheral surface of the holder 37, and an inner and outer double concentric circle is set in the closing portion 41d. A large number of through-holes 41e are formed at upper equal angular intervals, and a large number of through-holes 41e are arranged at equal angular intervals on the circumference along the outer large-diameter circle with a half pitch shift from the inner small-diameter through-holes 41e. A through hole 41e is formed. Water-tightness can be improved by interposing a packing (not shown) between the inner peripheral surface of the closing portion 41 d and the outer peripheral surface of the holder 37.

  On the outer peripheral surface of the nozzle cover 42, as shown in FIG. 6, a plurality of the suction ports 2 are formed at equal angular intervals on the circumference.

  In the case of the discharge nozzle 30 configured as described above, as shown in FIG. 6, the hot water as the gas-liquid dissolving fluid in which the gas is dissolved is upstream of the nozzle case 31 from the outflow pipe 11 as indicated by the arrow a. Enter the venturi tube 12a. Then, when passing through the upstream venturi tube 12a, the hot water is depressurized by the upstream venturi tube 12a, and bubbles 100a are generated from the hot water and a part of the generated bubbles 100a is split. Further, as shown in FIG. 8, a part of the hot water generates a vortex by the eddy current generating edge 12c, and a bubble 100a is generated from the hot water by the low pressure portion formed by the generation of the eddy current. To break up bubbles already generated upstream.

  Accordingly, bubbles can be generated by both the pressure reduction by the upstream side venturi tube 12a and the edge 12c for generating the vortex flow, and a larger amount than the case of generating bubbles only by the pressure reduction of the upstream side venturi tube 12a. Bubbles can be generated.

  Thereafter, the hot water containing the generated bubbles 100a enters the downstream venturi tube 12b, and the bubbles 100a are further divided by the recovery of pressure at the tapered portion of the downstream venturi tube 12b to generate split bubbles 100b.

  Next, the hot water containing the split bubbles 100 b exiting the downstream venturi pipe 12 b enters the vaporization flow path 132. Since the downstream end of the vaporization flow path 132 is narrower than the upstream side, the hot water that has entered the vaporization flow path 132 together with the split bubbles 100b is allowed to flow slowly to the extent that the vaporization of the air is promoted. As a result, the split bubbles 100b grow (become large) and can be formed into fine bubbles 100c having an outer diameter necessary and sufficient for white turbidity.

  Therefore, the hot and cold water containing the fine bubbles 100c is sufficiently clouded. And the hot water containing the fine bubble 100c is discharged to the bathtub 1 from the discharge outlet 3 in this state.

  Also, the bath water in the bathtub 1 is sucked into the nozzle cover 42 from the suction port 2 of the nozzle cover 42 as shown by an arrow b shown in FIG. As shown in FIG. 5, the electric pump 6 is sucked from the connection pipe 5 connected to the outer side of the nozzle case 31.

  In the above embodiment, the front surface 12d on the upstream side and the rear surface 12e on the downstream side of the eddy current generating edge 12c are configured to be inclined, but the present invention is not limited to this configuration. Any device that causes a vortex in a part of the liquid-dissolved fluid may be used and can be changed as appropriate.

  For example, as shown in FIG. 9 (a), a vortex generating edge 120c having an upstream front surface 120d substantially perpendicular to the axial direction of the upstream venturi tube 120a may be used. At that time, the length from the base end 120h to the projecting tip 120g on the downstream rear surface 120e is longer than the length from the base end 120f to the projecting tip 120g on the front surface 120d as shown in FIG. 9A. Although the length may be longer, as shown in FIG. 9B, the edge 121c for generating eddy currents in which the length on the rear surface 121e is substantially the same as or shorter than the length on the front surface 121d may be used.

  Alternatively, as shown in FIG. 9C, the upstream front surface 122d is inclined downstream at a predetermined angle in a direction orthogonal to the axial direction of the upstream venturi tube 12a, and the downstream rear surface 122e is You may make it comprise from the edge 122c for a vortex | eddy_current generation | occurrence | production formed substantially orthogonally to the axial direction of the side venturi pipe 12a.

  Furthermore, the edge for generating the vortex is not limited to one, but may be formed from a plurality of edges arranged at a distance in the axial direction of the venturi tube. For example, as shown in FIG. 10, two edges for generating a vortex are arranged at a distance in the axial direction of the upstream venturi 122a. In this case, the edges for generating eddy currents having the same shape may be arranged. However, as shown in FIG. 10, on the downstream side of the edge 12c for generating eddy currents shown in FIG. The eddy current generating edges 120c shown in a) may be arranged, and the eddy current generating edges having different shapes may be arranged.

  In the above embodiment, the bubble generating / breaking channel 131 has two upstream venturi tubes 12a and downstream venturi tubes 12b arranged in the front and rear in the flow direction. Alternatively, only one of the upstream venturi pipe 12a and the downstream venturi pipe 12b may be provided, and the vortex generating means may be provided in any one of the venturi pipes. However, as in the above embodiment, the upstream venturi tube 12a provided with the vortex generating means and the plurality of downstream venturi tubes 12b having a diameter smaller than that of the upstream venturi tube 12a disposed below the upstream venturi tube 12a are provided. As a result, when the gas-liquid dissolving fluid passes through the upstream venturi tube 12a, many bubbles are generated by the vortex generating means and the pressure reduction of the upstream venturi tube 12a, and the bubbles are split in the downstream venturi tube 12b. This is preferable in that a large number of fine bubbles can be generated.

  In the above embodiment, the edge for generating the vortex is provided in the upstream venturi tube 12a. However, the present invention is not limited to this, and instead of the upstream venturi tube 12a, the edge is provided in the downstream venturi tube 12b. In addition to the upstream side venturi tube 12a, the downstream side venturi tube 12b may be provided and may be changed as appropriate.

  Moreover, in the said embodiment, although the edge for vortex | eddy_current generation | occurrence | production is provided in the perimeter in the inner peripheral wall of the upstream venturi pipe 12a, it is not restricted to the thing of this form, and is intermittent in the circumferential direction of the upstream venturi pipe 12a. However, it may be provided as appropriate.

  In the above embodiment, the water supply facility is a bathtub that injects fine bubbles for white turbidity, but the present invention can of course be applied to a flush toilet that injects fine bubbles for bowl cleaning. .

It is a basic lineblock diagram of a bathtub device provided with a gas dissolution device concerning an embodiment of the present invention. It is a perspective view of the gas dissolving apparatus of FIG. 1 is a gas dissolving device of FIG. 1, (a) is a cross-sectional view, (b) is a cross-sectional view taken along the line II of (a). It is sectional drawing of the venturi pipe | tube of FIG. It is the perspective view which actualized the bathtub apparatus provided with the gas dissolving apparatus which concerns on embodiment of this invention. It is sectional drawing of the discharge nozzle which has a venturi pipe. It is a principal part expanded sectional view of an upstream venturi pipe. It is explanatory drawing when a vortex | eddy_current is produced | generated by the edge for eddy current production | generation. (A) is an enlarged sectional view of another embodiment of an edge for generating eddy currents, (b) is an enlarged sectional view of still another embodiment of an edge for generating eddy currents, and (c) is an edge for generating eddy currents It is an expanded sectional view of another embodiment of. FIG. 6 is an enlarged cross-sectional view of still another embodiment of a vortex generating edge. It is the perspective view which assembled the nozzle main body and the holder. It is a front view of a holder. It is a fixed flange, (a) is a front view, (b) is a sectional view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bathtub 2 Suction port 3 Discharge port 8 Gas dissolution apparatus 12a Upstream venturi pipe (pressure reduction means)
12b Venturi pipe on the downstream side (pressure reduction means)
12c Edge for eddy current generation (eddy current generation means)
30 Discharge nozzle 37 Holder 38 Channel narrowing member (vaporization promoting means)
131 Bubble generation / division channel 132 Vaporization channel

Claims (4)

An electric pump; a gas dissolving device connected to the electric pump; and a decompression unit connected to the gas dissolving device. The liquid is sent to the gas dissolving device by the electric pump, and the liquid is supplied by the gas dissolving device. The gas is dissolved under pressure to form a gas-liquid dissolving fluid, and the gas-liquid dissolving fluid with the gas pressurized and dissolved in the liquid is released by the pressure reducing means to generate fine bubbles from the discharge nozzle. A fine bubble generating device for jetting and discharging,
To the discharge nozzle, the pressure reducing means is provided, the pressure reducing means is formed of a venturi tube, the interior of the Venturi tube, vortex generating means to cause a vortex formed in a portion of the gas-liquid dissolving fluid flowing venturi A microbubble generator characterized by being made.   The eddy current generating means is an edge for generating eddy currents that protrudes from the inner peripheral wall of the venturi pipe in the circumferential direction of the venturi pipe so as to protrude from the inner peripheral side. Fine bubble generator.   3. The fine bubble generating device according to claim 2, wherein the front surface on the upstream side of the eddy current generating edge is formed of an inclined surface inclined toward the downstream side.   The fine bubble generating device according to any one of claims 1 to 3, wherein the edge for generating the eddy current is composed of a plurality of edges arranged at a distance in an axial direction of the venturi tube.

Images