JP4858327B2 - Microbubble generator - Google Patents

Description

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

Conventionally, fine air bubbles were released from the discharge nozzle into a bathtub (an example of a watering facility) by releasing the pressure of the air-water dissolved fluid in which air was pressurized and dissolved in water using a decompression means, and generating fine bubbles. There exists a 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-mentioned problems, the present invention is a microbubble generator that discharges from a discharge nozzle while releasing a pressure of a gas-water-dissolved fluid in which air is pressurized and dissolved in water by a decompression means to generate microbubbles. In addition, the discharge nozzle is provided with a flow path for flowing the gas / water dissolved fluid, and a vaporized flow path area is formed in a part of the flow path to promote vaporization of dissolved air dissolved in the water / water dissolved fluid. Vaporization promoting means is provided, the vaporization promoting means for making the flow path cross-sectional area at the downstream end of the vaporization flow path region portion smaller than the upstream flow path cross-sectional area and narrowing the flow path. A flow path narrowing member, wherein the pressure reducing means is provided in the flow path of the discharge nozzle, and the flow path narrowing forming member is disposed on the downstream side of the pressure reducing means in the flow path. The vaporization channel region is provided downstream of the decompression means. And the flow passage cross-sectional area at the downstream end of the vaporization flow path region is 60% to 90% of the flow cross-sectional area upstream of the vaporization flow flow region. The gasification channel region portion is configured to include a closed portion that blocks a part of the flow path, and an opening provided adjacent to the closed portion, and the opening in the closed portion The boundary surface is composed of an inclined surface formed so that the opening area gradually increases from the upstream end portion of the boundary surface to the downstream side, and the downstream end portion of the boundary surface is formed on a curved surface. The present invention provides a fine bubble generating device.

According to a second aspect of the present invention, the closing portion preferably includes a plurality of beams having a predetermined width.

  According to the first aspect of the present invention, when a gas-water dissolving fluid in which air is supersaturated flows through the vaporization channel region formed by the vaporization promoting means, the vaporization of air from the gas-water dissolving fluid is promoted. It is possible to grow (increase the diameter) the bubbles flowing together with the gas-water dissolving fluid. Thereby, for example, bubbles having a size that is too small to be suitable for white turbidity can be formed into fine bubbles having an outer diameter that is necessary and sufficient for white turbidity.

Further, the vaporization flow channel region is made to flow through the vaporization flow channel region by a flow channel narrowing member in which the flow channel cross-sectional area on the downstream side of the vaporization flow channel region is made smaller than the flow channel cross-sectional area on the upstream side to narrow the flow channel. The flow rate of the gas / water dissolving fluid can be reduced as compared with the case where the channel narrowing member is not provided, and the time during which the gas / water dissolving fluid flows through the vaporization channel region can be increased. Thus, it is possible to promote the vaporization by giving a time margin for vaporizing the air to the air-water dissolved fluid in which the air is supersaturated. Further, at that time, the flow path narrowing member may be used to make the flow path cross-sectional area on the downstream side of the vaporization flow path area smaller than the flow path cross-sectional area on the upstream side. .

Further , since the vaporization channel region is formed on the downstream side of the decompression unit in the channel by the channel narrowing member, the split bubbles formed by the decompression unit are fine bubbles having an outer diameter necessary and sufficient for white turbidity. Can be formed. In addition, the channel narrowing member makes the channel cross-sectional area at the downstream end of the vaporization channel region part 60% to 90% of the upstream channel cross-sectional area. It is possible to efficiently form fine bubbles having an outer diameter necessary and sufficient for clouding.

Further, since the downstream end of the boundary surface with the opening in the closed portion of the flow path narrowing member is a curved surface, for example, when the downstream end of the boundary surface is configured from a corner (edge). It is possible to prevent the vortex from being generated by the corner portion at the downstream end and the bubbles from adhering to the corner portion, and the two or more bubbles from adhering to the corner portion and joining together. As a result, it is possible to prevent bubbles formed in the outer diameter necessary and sufficient for white turbidity in the vaporization flow path region from becoming unsuitable for white turbidity due to unification. It is possible to discharge from the discharge nozzle in a state where the outer diameter is necessary and sufficient for the formation.

According to the second aspect of the present invention, since the blocking portion includes a plurality of beams having a predetermined width, the flow path breakage of the flow path can be achieved by changing the number of beams or using beams having different widths. The area can be easily adjusted to an appropriate size and can be easily formed.

  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 according to an embodiment of the present invention. In this embodiment, the microbubble generator is used for a bathtub 1 and is configured to generate microbubbles in bath water in the bathtub 1. The suction port 2 and the discharge port 3 are provided on the inner surface of the bathtub 1, and the air suction port 4 is provided on the flange portion of the bathtub 1.

  The suction port 2 is connected to the suction side of the electric pump 6 through the connection pipe 5, and the discharge side of the electric pump 6 is connected to the injection port 9 on the suction side of the air dissolving device 8 through the inflow pipe 7. . The outlet 10 on the discharge side of the air 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 air 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 the 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 water flows out from the cylindrical body 23 is formed on the downstream side B.

  In the cylindrical body 23, air such as air serving as a solute and water such as water serving as a solvent are stored, and air is disposed in the vicinity of the substantially center of the substantially cylindrical side wall portion 21 in the vertical direction. The interface 24 with water is located, and the portion on the upstream side A above the interface 24 becomes an air storage portion 25 in which air is stored, and the portion on the downstream side B from the interface 24 is water in which water is stored. It becomes the storage part 26.

  The injection port 9 is located on the inner wall surface of the air reservoir 25 (the inner wall surface 21 on the upstream side A or the inner wall surface of the end wall portion 22 from the interface 24), at a position near the interface 24, or slightly below the interface 24. The water outlet 26 is formed on the inner wall surface (inner wall surface of the side wall 21 on the downstream side B from the interface 24), and the outlet 10 is connected to the inner wall surface near the end of the water reservoir 26 (on the downstream side B from 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 air and water reservoir 26 is stored in the air reservoir 25 at the position of the air vent 27. It becomes the level of the interface 24 of the water stored.

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

  As described above, the air 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 air-water mixed fluid or the collision at the interface 24, the agitation of water when jetted, and the like Water, air in the air-water mixed fluid, and water are mixed, and dissolution of air into water is promoted. That is, due to shearing by mixing and stirring, bubbles (air) mixed with water are subdivided and the total surface area in contact with water increases, and the dissolved concentration of air near the interface between water and air increases. Since it is reduced by homogenization by mixing and stirring and the dissolution rate of air in water increases, dissolution of air in water is promoted.

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

  In this embodiment, the flow channel 31a includes a bubble generation (foaming) flow channel region 131, a bubble splitting flow channel region 133 disposed on the downstream side of the bubble generation flow channel region 131, and the bubble splitting. And a vaporization channel region part 132 disposed on the downstream side of the channel region part 133.

  The bubble generation flow channel region 131 is a flow channel for generating bubbles from the gas-water dissolved fluid. The bubble generation flow path region 131 of this embodiment is provided with an upstream venturi pipe 12a as a decompression means, and from an upstream end of the upstream venturi pipe 12a to a downstream venturi pipe 12b described later. Formed in the region.

  The upstream side venturi pipe 12a is fitted in the upper part of the nozzle case 31, and is provided vertically in FIG. 6 on the inlet side of the bubble generation flow path region 131.

  The bubble generation flow channel region 131 is provided with a current generation means. The current generation means is for causing a vortex or a swirl flow in part or all of the gas-water dissolving fluid flowing through the upstream side venturi tube 12a. The current transformation generating means of this embodiment is constituted by an edge 12c for generating vortex flow provided in the upstream side venturi tube 12a, and causes vortex flow in a part of the gas-water dissolved fluid flowing in the upstream side venturi tube 12a. It has become.

  As shown in FIG. 7, the eddy current generating edge 12c is provided on the inner peripheral wall of the upstream venturi tube 12a so as to protrude radially inward (inner peripheral side) along the entire circumference. Yes.

  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.

  Note that the current transformation generating means is not limited to the form of the eddy current generating edge 12c as the eddy current generating means, and may be constituted by, for example, a swirling flow generating means for generating a swirling flow, and may be changed as appropriate.

  Returning to FIG. 6, the bubble splitting channel region part 133 is a channel that splits the bubbles generated in the bubble generating channel region part 131 to generate split bubbles. The bubble splitting flow channel region portion 133 of this embodiment is provided with a downstream venturi tube 12b as decompression means, and the downstream end from the upstream end of the flow channel formed inside the downstream venturi tube 12b. It is formed in a region that reaches the part.

  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 9, the nozzle body 29 has a cylindrical fitting portion 29a for fitting into the outlet side (sideways portion) portion of the nozzle case 31 via an O-ring 33, and 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.

  Further, these downstream venturi pipes 12b have an upstream inlet portion formed in an outward trumpet shape, a shortest straight portion having the smallest diameter is formed immediately downstream thereof, and the downstream side from the upstream side to the downstream side thereof. The long taper part which diameter-expanded toward the side is formed.

  Next, the vaporization channel region 132 will be described. The vaporization flow channel region 132 is a flow channel for growing the split bubbles (increasing the diameter) to form fine bubbles having an outer diameter necessary and sufficient for white turbidity.

  As shown in FIG. 6, the vaporization flow path region portion 132 of this embodiment is formed on the downstream side of the downstream venturi pipe 12 b in the nozzle body 29 (left side portion in FIG. 6). The vaporization channel region part 132 is formed by vaporization promoting means for promoting the vaporization of dissolved air dissolved in the gas-water dissolution fluid, and the split bubbles together with the gas-water dissolution fluid form the vaporization channel region unit 132. While flowing, it can be formed into fine bubbles having an outer diameter necessary and sufficient for whitening.

  In this embodiment, the vaporization promoting means is a channel narrowing member in which the channel cross-sectional area at the downstream end of the vaporization channel region 132 is made smaller than the upstream channel cross-sectional area to narrow the channel. 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-water dissolving fluid flowing through the vaporization flow path region 132, and The time during which the water-dissolving fluid flows through the vaporization channel region 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. 37 a is screwed in, and a flow path narrowing member 38 is provided on the inner peripheral side of the holder 37.

  As shown in FIGS. 6 and 10, the flow path narrowing member 38 of this embodiment is formed by a closed portion 38 a disposed so as to be substantially orthogonal to the axis of the holder 37, and the closed portion 38 a. And four openings 38b provided adjacent to 38a. Then, the channel narrowing member 38 configured in this way forms a vaporization channel region 132 on the downstream side of the downstream venturi 12b inside the nozzle body 29, and in the vaporization channel region 132. The flow path cross-sectional area at the downstream end is a cross-sectional area corresponding to the entire opening 38b of the flow path narrowing member 38, and the flow path at the downstream end in the vaporization flow path area 132 is the vaporization flow area section. It is narrower than other parts of 132.

  In this embodiment, the closed portion 38a of the flow path narrowing member 38 blocks the flow path formed inside the nozzle body 29 so as to be 10% to 40%, and the vaporization flow path area portion. The flow path cross-sectional area at the downstream end in 132 is set in a range of 60% or more and 90% or less with respect to the flow path cross-sectional area of the other part in the vaporization flow path region part 132.

  Further, in this embodiment, as shown in FIG. 11, the boundary surface 39 between the closed portion 38a and the opening 38b has a downstream end portion 39a (the boundary surface 39 and the downstream end surface on the left side of the closed portion 38a in the drawing). (Crossing part) is composed of a curved surface (R surface).

  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.

  As shown in FIGS. 13 (a) and 13 (b), the fixing flange 41 is formed with a plate-like closing portion 41d that closes the outer peripheral surface of the holder 37. A concentric circle is set, and a large number of through holes 41e are formed along the inner small diameter circle at equal angular intervals on the circumference. In a shifted state, a large number of through holes 41e are formed at equal angular intervals on the circumference. 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, hot water as an air-water dissolving fluid in which air is dissolved is upstream of the nozzle case 31 from the outflow pipe 11 as indicated by an arrow a. Enter the venturi tube 12a. 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. Further, as shown in FIG. 8, a part of the hot water generates a vortex by the edge 12c for generating the vortex, and bubbles 100a are generated from the hot water by the low-pressure portion formed by the generation of the vortex.

  Accordingly, bubbles can be generated by both the pressure reduction by the upstream venturi tube 12a and the edge 12c for generating the vortex flow. Compared to the case where bubbles are generated only by the pressure reduction of the upstream side venturi tube 12a, the upstream venturi tube is generated. A larger amount of bubbles can be generated in the bubble generation flow channel region 131 formed in the region from the upstream end of the tube 12a to the downstream venturi tube 12b.

  Thereafter, the hot water containing the generated bubble 100a enters the downstream venturi tube 12b, and the bubble 100a is further divided by the recovery of pressure at the tapered portion 122 of the downstream venturi tube 12a to generate a divided bubble 100b.

  Next, the hot water including the split bubbles 100 b exiting the downstream venturi tube 12 b enters the vaporization flow path region 132. Since the flow path at the downstream end of the vaporization flow channel region 132 is narrower than the upstream side, the hot water that has entered the vaporization flow channel region 132 together with the split bubbles 100b promotes the vaporization of air from the hot water. It is slowly washed away to the extent that 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.

  Further, since the downstream end 39a of the boundary surface 39 with the opening 38b in the closed portion 38a of the flow path narrowing member 38 is a curved surface, for example, the downstream end of the boundary surface is configured by a corner (edge). As in the case of, the eddy current is generated by the corner portion at the downstream end portion, and the bubbles easily adhere to the corner portion, so that two or more bubbles adhere to the corner portion and can be prevented from being united. .

  As a result, it is possible to prevent bubbles formed in the outer diameter necessary and sufficient for white turbidity in the vaporization channel region 132 from becoming unsuitable for turbidity due to coalescence, and necessary for white turbidity. It can be made to discharge from a discharge nozzle in the state formed in sufficient outside diameter. 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 channel cross-sectional area at the downstream end of the vaporization channel region 132 is set to 60% to 90% with respect to the channel cross-sectional area of the other part of the vaporization channel region 132. However, the present invention is not limited to this range and can be changed as appropriate. However, if it is the said range, a split bubble is preferable at the point which can be efficiently formed in the fine bubble of an outer diameter required and sufficient for white turbidity, More preferably, it is about 75%.

  Further, in the above embodiment, the flow path narrowing member 38 is composed of a cross-shaped blocking portion 38a and four openings 38b. However, the present invention is not limited to this configuration and can be changed as appropriate. obtain. For example, as shown in FIG. 12 (a), a channel narrowing member 380 is provided adjacent to the beam 380c and a blocking portion 380a composed of a plurality (four) of rod-shaped beams 380c arranged vertically and horizontally. And a plurality of (nine) openings 380b formed.

  Alternatively, as shown in FIG. 12B, the flow path narrowing member 381 is a rod-shaped beam 381c having a narrower width than the beam 380c shown in FIG. ) And a plurality of (16) openings 381b provided in the beam 381c.

  By forming the channel narrowing member by changing the number of beams or the beam width in this way, the channel narrowing member can be formed with a simple configuration and easily adjusting the aperture ratio. it can.

  As shown in FIG. 12C, the closed portion 382a of the flow path narrowing member 382 is composed of a ring-shaped beam 382c and a rod-shaped beam 382d that supports the ring-shaped beam 382c, and has an opening. The portion 382b may be configured by a portion formed inside the ring-shaped beam 382c and adjacent to the ring-shaped beam 382c and the rod-shaped beam 382d.

  The flow path narrowing member 38 may be formed separately from the holder 37 and attached to the holder 37. However, the flow path narrowing member 38 may be formed integrally with the holder 37, and can be implemented with appropriate modifications. .

  Further, the flow path narrowing member 38 is not limited to the one provided in the holder 37 but may be provided in the nozzle body 29. Even when the flow path narrowing member 38 is provided in the holder 37, the flow path narrowing member 38 is provided integrally with the holder 37, or the flow path narrowing member 38 is separated from the holder 37. It may be configured from a thing and attached to the holder 37, and can be changed as appropriate.

  The above embodiment is for a bathtub that discharges fine bubbles for whitening as a watering facility, but the present invention can also be applied to a flush toilet or the like that jets fine bubbles for bowl cleaning. Of course.

It is a basic lineblock diagram of the fine bubble generating device concerning the embodiment of the present invention. It is a perspective view of the air dissolving apparatus of FIG. 1. It is the air dissolving apparatus of FIG. 1, (a) is sectional drawing, (b) is the II sectional view taken on the line of (a). It is sectional drawing of the venturi pipe | tube of FIG. It is the perspective view which actualized the fine bubble generator concerning the embodiment of the present 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. It is the perspective view which assembled the nozzle main body and the holder. It is a front view of a holder. It is sectional explanatory drawing which follows the XI-XI line of FIG. It is related with explanatory drawing of other embodiment of a flow-path narrowing member, (a) is a front view of the holder which has a flow-path narrow formation member of other embodiment, (b) is a flow-path narrowing of further another embodiment. The front view of the holder which has a formation member, (c) is a front view of the holder which has the flow-path narrowing formation member of further another embodiment. 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 Air 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 (current generation means)
30 Discharge nozzle 37 Holder 38, 380, 381, 382 Channel narrowing member (vaporization promoting means)
38a, 380a, 381a, 382a Closure part 38b, 380b, 381b, 382b Opening part

Claims (2)

A micro-bubble generating device that discharges air-dissolved fluid in which air is pressurized and dissolved in water with a decompression means and discharges it from a discharge nozzle while generating micro-bubbles,
The discharge nozzle is provided with a flow path for flowing the gas-water dissolved fluid, and a vaporization flow area is formed in a part of the flow path to promote vaporization of dissolved air dissolved in the gas-water dissolved fluid. Means are provided,
The vaporization promoting means includes a channel narrowing member for narrowing the channel by making the channel cross-sectional area at the downstream end of the vaporization channel region smaller than the channel cross-sectional area on the upstream side,
The pressure reducing means is provided in the flow path of the discharge nozzle,
The channel narrowing member is disposed on the downstream side of the decompression unit in the channel, thereby forming the vaporization channel region portion on the downstream side of the decompression unit, and The flow path cross-sectional area at the downstream end is set to 60% to 90% with respect to the flow path cross-sectional area upstream of the vaporization flow path area. It is composed of a closed portion that blocks a portion of the road, and an opening provided adjacent to the closed portion,
The boundary surface of the closed portion with the opening portion is composed of an inclined surface formed so that the opening area gradually increases from the upstream end portion to the downstream side of the boundary surface, and downstream of the boundary surface. The microbubble generator characterized in that the side end is formed on a curved surface.   2. The fine bubble generating device according to claim 1, wherein the closing portion includes a plurality of beams having a predetermined width.

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