JP4706664B2 - Fine bubble generating apparatus and fine bubble generating method - Google Patents

Description

  The present invention relates to a fine bubble generating apparatus and a fine bubble generating method that are most suitable for watering equipment.

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-mentioned problems, the present invention provides a method for generating fine bubbles in which a gas-liquid dissolved fluid in which a gas is pressurized and dissolved in a liquid is depressurized by a decompression unit and ejected and discharged from a discharge nozzle while generating fine bubbles. The apparatus includes a bubble generating channel region, a bubble splitting channel region disposed downstream of the bubble generating channel region, and a downstream of the bubble splitting channel region. A gas flow passage region portion disposed on the side, an upstream venturi tube as the pressure reducing means is provided in the bubble generation flow channel region portion, and the upstream venturi tube includes the upstream side By providing a current generating means for causing a vortex or swirl flow in the gas-liquid dissolving fluid flowing in the venturi tube, it is possible to generate bubbles from the gas-liquid dissolving fluid in the bubble generating flow path region, and the current generation Means for the upstream side The inner peripheral wall of the Churi tube is composed in the radial direction of the projection of the edge or swirling flow for the generation of inside projecting a vortex for generating, in the bubble dividing flow channel region part, by the pressure reducing means is provided, wherein The bubble generated in the bubble generation channel region can be split to generate a split bubble, and the vaporization channel region promotes vaporization of the dissolved gas dissolved in the gas-liquid dissolution fluid by the vaporization promoting means. by being configured so as to obtain, the division bubble, it der those so can be grown on an outer diameter of larger than its division bubbles, downstream end of the vaporization flow path region portion The microbubble generator is characterized by comprising a flow path narrowing member for narrowing the flow path by making the cross sectional area smaller than the upstream flow path cross sectional area .

In order to solve the above-mentioned problem, the present invention uses the fine bubble generating device according to claim 1 to release the pressure of a gas-liquid dissolving fluid in which a gas is pressure-dissolved in a liquid to remove the fine bubbles. A method of generating fine bubbles, which is ejected and discharged from a discharge nozzle while being generated, in a bubble generation region formed by an upstream venturi tube provided in a bubble generation flow channel region provided in the discharge nozzle, wherein the upstream side The gas-liquid dissolved fluid flowing through the upstream-side venturi pipe is swirled by the flow-generating means configured by the vortex-generating edge or the swirl-flow generating protrusion projecting radially inward from the inner peripheral wall of the venturi pipe. by causing the swirling flow, the gas-liquid dissolving fluid so that a bubble from the gas-liquid dissolving fluid when flowing through the upstream venturi, then the generated air bubbles, to the discharge nozzle In the bubble splitting region formed by the bubble splitting channel region provided downstream of the bubble generating channel region, the generated bubbles are split to generate split bubbles, and then the discharge On the downstream side of the bubble splitting channel region in the nozzle, the channel cross-sectional area at the downstream end of the vaporization channel region is made smaller than the upstream channel cross-sectional area by the channel narrowing member. In the vaporization region formed by the vaporization flow channel region provided so that the vaporization of the dissolved gas dissolved in the gas-liquid dissolution fluid can be promoted by the vaporization promotion means narrowing the flow channel, Provided is a method for generating fine bubbles, characterized in that, while flowing in a road region, the microbubbles are grown to have a larger outer diameter than the split bubbles.

According to the first and second aspects of the present invention, the vortex flow or the swirl flow is caused in a part or the whole of the gas-liquid dissolving fluid flowing in the bubble generation (or foaming) flow path region portion by the current generation means, and the vortex Alternatively, bubbles can be generated by the low-pressure part formed with the swirling flow. Thereby, a large amount of bubbles can be generated, for example, compared to a case where bubbles are generated only by the venturi tube.

  In addition, the generated bubbles can be split in the bubble splitting channel region to generate split bubbles. Thereby, a larger number of split bubbles can be generated.

  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.

  Further, the vaporization promoting means can promote the vaporization of air from the gas-liquid dissolved fluid in which the air is supersaturated when the broken bubbles flow in the vaporization flow path region, and grow (larger) the broken bubbles. Can be made. Thereby, it can form in the fine bubble of an outer diameter required and sufficient for white turbidity.

Further, the gas-liquid flowing in the vaporization channel is formed by the channel narrowing member that narrows the channel by making the channel cross-sectional area on the downstream side of the vaporization channel region smaller than the channel cross-sectional area on the upstream side. The flow rate of the dissolved fluid can be reduced as compared with the case where the channel narrowing member is not provided, and the time during which the gas-liquid dissolved fluid flows through the vaporization channel region can be increased. Thereby, the time-liquid margin which vaporizes air can be given to the gas-liquid dissolution fluid which understood air to supersaturation, and vaporization can be promoted. Accordingly, the split bubbles can be formed into fine bubbles having an outer diameter necessary and sufficient for whitening. 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 smaller than the flow path cross-sectional area on the upstream side.

  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 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 flow channel region 133. And a vaporizing flow path region portion 132 disposed on the downstream side.

  The bubble generation flow channel region 131 is a flow channel for generating (foaming) bubbles from the gas-liquid dissolving fluid. The bubble generation flow channel region 131 of this embodiment is provided with an upstream venturi tube 12a as decompression means, and a downstream venturi tube 12b described later from an upstream end inside the upstream venturi tube 12a. It is formed in the area up to.

  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 a part or the whole of the gas-liquid dissolving fluid flowing in the upstream side venturi tube 12a. The current transformation generating means of this embodiment is constituted by an eddy current generating edge 12c provided in the upstream side venturi pipe 12a, and causes a part of the gas-liquid dissolved fluid flowing in the upstream side venturi pipe 12a to generate a vortex flow. 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.

  The bubble splitting channel region 133 is a channel that splits the bubbles generated in the bubble generating channel region 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, from the entire flow channel of the downstream venturi tube 12b, that is, from the upstream end of the flow channel. It is formed in a region that reaches the downstream end.

  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.

  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 downstream from the upstream side. The long taper part which diameter-expanded toward the side is formed.

  Next, returning to FIG. 6, the vaporization channel region 132 will be described. The vaporization flow channel region 132 is a flow channel for growing (enlarging) the split bubbles to form fine bubbles having an outer diameter necessary and sufficient for whitening.

  The vaporization channel region portion 132 of this embodiment is formed on the downstream side of the downstream venturi tube 12b in the nozzle body 29 (left side portion in FIG. 6). Further, the vaporization flow path region portion 132 promotes vaporization of the dissolved gas dissolved in the gas-liquid dissolution fluid by the vaporization promoting means, and the split bubbles flow through the vaporization flow passage region portion 132 together with the gas-liquid dissolution fluid. In the meantime, fine bubbles having an outer diameter necessary and sufficient for whitening can be formed.

  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-liquid dissolving fluid flowing in the vaporization flow path region portion 132, thereby reducing the gas flow. The time during which the liquid-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. 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. The flow path narrowing member 38 configured in this manner allows the flow path cross-sectional area of the downstream end portion of the vaporization flow path region portion 132 formed inside the nozzle body 29 to be the entire flow path narrowing member 38. This corresponds to the cross-sectional area of the opening 38 b, and the downstream end of the vaporization channel region 132 is narrower than other portions of the vaporization channel region 132.

  The channel cross-sectional area of the discharge side end in the vaporization channel region 132 is not particularly limited and can be changed as appropriate. It is preferable to be in the range of about 60 to about 90% with respect to the area, more preferably about 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. 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 of generating bubbles by only the pressure reduction of the upstream venturi tube 12a, the upstream venturi tube 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 bubbles 100 a generated in the bubble generation channel region 131 enters the downstream venturi tube 12 b constituting the bubble division channel region 133, and the bubbles formed by the bubble division channel region 133 In the split region, at the taper portion of the downstream venturi tube 12b, the bubble 100a is split and the split bubble 100b is generated by the pressure recovery.

  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 downstream end of the vaporization channel region 132 is narrower than its upstream side, the hot water that has entered the vaporization channel region 132 together with the split bubbles 100b promotes the vaporization of air from the hot water. Slowly washed away. As a result, fission bubbles 100b grow (the outer shape becomes larger) 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.

  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.

  Further, in the above embodiment, the current generating means is constituted by an edge for generating eddy current that causes the Venturi tube to generate eddy current, but the current changing means is constituted by an edge for generating eddy current. Not limited, but can be changed as appropriate.

  For example, instead of the eddy current generating edge, for example, as shown in FIGS. 11 (a), 11 (b) and 12, a swirl flow generation projection 221 and 222 for generating a swirl flow in the venturi tube 220c is provided. It is also good. More specifically, as shown in FIGS. 11 and 12, protrusions 221 and 222 for generating swirl flows are provided on the rear side and the front side of the upstream side venturi tube 220c, respectively.

  The rear-side and front-side swirl flow generation projections 221 and 222 are inclined at a predetermined angle with respect to a plane parallel to the axial direction of the upstream venturi tube 220c and a plane orthogonal to the axial direction, respectively. The upstream venturi tube 220c protrudes radially inward.

  Then, when the swirl flow generating projections 221 and 222 cause hot water as a gas-liquid dissolving fluid that has entered the upstream side venturi tube 220c of the nozzle case 31 from the outflow tube 11 to pass through the upstream side venturi tube 220c. While the pressure is reduced and the swirl flow generating protrusions 221 and 222 on the rear side and the front side generate a swirl flow in the counterclockwise direction in FIG. 11A, the swirl flow is generated as the swirl flow is generated. Bubbles are generated in the low-pressure part formed in the central part of the gas, and the generated bubbles are split to generate split bubbles.

  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 explanatory drawing of the upstream venturi pipe which has the current transformation production | generation means of other embodiment, (a) is the top view, (b) is the XI-XI sectional view taken on the line of (a). It is the XII-XII sectional view taken on the line of Fig.11 (a). 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 (current generation means)
30 Discharge nozzle 37 Holder 38 Channel narrowing member (vaporization promoting means)
131 Bubble generation channel region 132 Vaporization channel region 133 Bubble splitting channel region

Claims (2)

A gas-liquid dissolving fluid in which a gas is pressurized and dissolved in a liquid is released by a decompression means, and a fine bubble generating device that ejects and discharges from a discharge nozzle while generating fine bubbles,
The discharge nozzle is provided with a bubble generating channel region, a bubble splitting channel region disposed downstream of the bubble generating channel region, and downstream of the bubble splitting channel region. Vaporization flow path region portion is provided,
The bubble generation flow path region is provided with an upstream venturi pipe as the pressure reducing means, and the upstream venturi pipe causes a vortex or a swirl flow in the gas-liquid dissolved fluid flowing in the upstream venturi pipe . By providing the current generation means, it is possible to generate bubbles from the gas-liquid dissolved fluid in this bubble generation flow path region,
The current generating means is composed of a vortex generating edge or a swirling flow generating protrusion projecting radially inwardly on the inner peripheral wall of the upstream venturi tube,
The bubble splitting channel region is provided with a decompression means, so that the bubbles generated in the bubble generating channel region can be split to generate split bubbles.
The vaporization channel region is configured to be capable of promoting the vaporization of the dissolved gas dissolved in the gas-liquid dissolution fluid by the vaporization promoting means, so that the split bubbles have an outer diameter larger than that of the split bubbles. what der that to be able to grow into larger, to narrow the flow path is made smaller than the flow path cross-sectional area of the upstream cross-sectional area at the downstream end of the vaporization flow path region portion A microbubble generator characterized by comprising a flow path narrowing member . A fine bubble generating method using the fine bubble generating device according to claim 1 to release the pressure of a gas-liquid dissolving fluid in which a gas is pressurized and dissolved in a liquid, and ejecting and discharging from the discharge nozzle while generating fine bubbles. There,
In the bubble generation region formed by the upstream venturi tube provided in the bubble generation flow channel region provided in the discharge nozzle, the vortex flow projecting radially inwardly on the inner peripheral wall of the upstream venturi tube The gas-liquid dissolving fluid is caused to flow into the upstream side by causing a vortex or a swirling flow in the gas-liquid dissolving fluid flowing through the upstream venturi pipe by the current generating means constituted by the edge or the swirling flow generating projection. When flowing through the Venturi tube , bubbles are generated from the gas-liquid dissolving fluid,
Thereafter, the generated bubbles are split in a bubble splitting region formed by a bubble splitting channel region provided downstream of the bubble generating channel region in the discharge nozzle. To generate split bubbles,
Next, on the downstream side of the bubble splitting flow channel region in the discharge nozzle, the flow channel cross-sectional area at the downstream end of the vaporization flow channel region is separated by a flow channel narrowing member. In the vaporization region formed by the vaporization flow channel region provided so as to promote the vaporization of the dissolved gas dissolved in the gas-liquid dissolution fluid by the vaporization promoting means smaller than the area and narrowing the flow channel, A method of generating fine bubbles, characterized in that bubbles are grown to have a larger outer diameter than the split bubbles while flowing in the vaporization flow path region.

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