JP4915602B2 - 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 a discharge nozzle into a bathtub (an example of a watering facility) by releasing the pressure of the air-water dissolved fluid in which water was pressurized and dissolved in water using decompression means. 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 provides a microbubble generator that discharges air-dissolved fluid, in which air is pressurized and dissolved in water, with a decompression unit and discharges it from a discharge nozzle while generating microbubbles. The discharge nozzle is provided with the pressure reducing means, the pressure reducing means is constituted by a venturi tube, and a recess having a substantially V-shaped cross section in a side view and a downstream of the recess at the discharge side end of the venturi tube. The present invention provides a fine bubble generating device characterized in that an edge formed by a projecting portion having a substantially right-angled cross section projecting into a flow path is formed.

As claim 2, the discharge nozzle, the pressure reducing means nozzle body in which a plurality of venturi is formed a is provided at an end portion of the discharge side of the nozzle body, extending in the discharge direction the holder A cylindrical portion surrounding the outermost periphery of the inner diameter portion of the plurality of venturi tubes at the center portion is formed in the holder, and an end portion on the nozzle body side of the cylindrical portion is on the discharge side of the venturi tube. The diameter of the end on the nozzle body side of the cylindrical part is set smaller than the circumscribed circle of the end part on the discharge side of the plurality of venturi pipes in the center part, while being close to the end part. It is preferable that the edge is formed at the discharge side end of the plurality of venturi pipes in the portion.

According to the present invention, the discharge nozzle end of the venturi tube on the discharge side is provided with a recess having a substantially V-shaped cross section in a side view and a protrusion at a right angle in cross section that protrudes into the flow path. By forming an edge consisting of a part , microbubbles are forcibly split and further refined by the edge and the vortex generated downstream of the edge, and the amount of microbubbles generated is greatly increased. To come. In this way, without using a large-scale device or a long path, the amount of microbubbles generated can be greatly increased with a simple configuration in which an edge is formed at the discharge side end of the venturi tube of the discharge nozzle. And the cloudiness can be improved.

According to claim 2 , it is composed of two parts, a nozzle body formed with a venturi tube and a holder formed with a cylindrical portion, and the discharge side of a plurality of venturi tubes is simply assembled by assembling the nozzle body and the holder. A minute edge can be easily formed at the end of the substrate.

It is a basic lineblock diagram of the bathtub apparatus provided with 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 bathtub apparatus provided with the fine bubble generator which concerns on embodiment of this invention. It is sectional drawing of the discharge nozzle which has a venturi pipe. It is the assembly body of a nozzle main body and a holder, (a) is the perspective view seen from the holder side, (b) is the perspective view seen from the nozzle main body side. It is a fixed flange, (a) is a front view, (b) is a side sectional view. (A) is an expanded sectional view which shows the relationship between the cylindrical part of a holder and the downstream venturi pipe of a nozzle main body, (b) is an expanded sectional view of a modification. It is the assembly of the nozzle main body and holder of a modification, (a) is the II-II sectional view of (b), (b) is side sectional drawing, (c) is a front view, (d) is the principal part It is an expanded sectional view.

  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 bathtub device provided with a fine bubble generating device of one embodiment of the present invention, and is configured to generate fine bubbles in bath water used in the bathtub 1. A suction port 2 and a discharge port 3 are provided on the inner surface of the bathtub 1, and an 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.

  When hot water in which air is dissolved is discharged from the discharge port 3 into the bath water in the bathtub 1, the dissolved air is precipitated in the bath water and fine bubbles are generated.

  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 outlet 10 through which water flows out from the cylindrical body 23 is formed on the downstream side B.

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

  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. In this way, by providing a plurality of downstream venturi tubes 12b in parallel, the bubbles in the gas-water mixture are crushed into small bubbles to some extent by the upstream venturi tubes 12a, and then the downstream venturi tubes 12b. Since smaller bubbles can be formed, a larger amount of smaller bubbles can be generated.

  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 outlet pipe 11 is connected to the inlet side (vertical portion) via an O-ring 32, and the central upstream venturi pipe 12a is fitted into the inlet-side flow path 31a. .

  A nozzle body 29 in which the plurality of downstream venturi pipes 12b are formed is fitted into an outlet side (laterally directed portion) flow path 31a via an O-ring 33.

  The nozzle body 29 has a cylindrical fitting portion 29a for fitting into a flow path 31a on the outlet side (lateral portion) of the nozzle case 31 via an O-ring 33, and projects forward (discharge direction) from the fitting portion 29a. A cylindrical projecting portion 29b, and a plate-shaped closing portion 29c formed between the cylindrical projecting portion 29b and the fitting portion 29a, and an inner and outer double concentric circle are set in the closing portion 29c. A plurality of (six in this example) downstream venturi tubes 12b are formed along the circle at equal angular intervals on the circumference, and a plurality of downstream venturi tubes 12b are formed along the outer large-diameter circle at equal angular intervals on the circumference. (10 in this example) downstream venturi tubes 12b are formed (in this example, 16 downstream venturi tubes 12b in total). The plurality of venturi tubes 12b can be referred to as a venturi tube group.

  A cylindrical holder 37 extending in the discharge direction is provided at the discharge side end of the nozzle body 29, and the female screw 37a of the holder 37 is screwed into the male screw 29d at the front end of the protruding portion 29b of the nozzle body 29. Thus, the holder 37 can be attached to the nozzle body 29. The specific structure of the downstream venturi tube 12b of the nozzle body 29, the specific structure of the holder 37, and the assembly relationship between the nozzle body 29 and the holder 37 will be described in detail later.

  A packing 40 having a U-shaped cross-section is fitted into the mounting hole 1b of the side wall 1a of the bathtub 1 and the flange portion 31b on the outlet side (sideways portion) of the nozzle case 31 is applied to the packing 40 from the outside of the bathtub 1. In addition, the external thread 41a at the rear end portion of the cylindrical fixing flange 41 is screwed into the internal thread 31c of the flange portion 31b of the nozzle case 31 from the inside of the bathtub 1 so that the flange portion 41b at the front end portion of the fixing flange 41 becomes the packing 40. The flange portion 31b of the nozzle case 31 comes into close contact with the packing 40 in a water tight manner. 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 detail in FIG. 8, the fixing flange 41 is formed with a plate-like closing portion 41 d that closes the outer peripheral surface of the holder 37, and inner and outer double concentric circles are set in the closing portion 41 d. A large number of through-holes 41e are formed at equal angular intervals on the circumference of the small-diameter circle, and the circular holes are shifted by a half pitch from the inner small-diameter through-hole 41e along the outer large-diameter circle. A large number of through holes 41e are formed at equal circumferential intervals. 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.

  As shown in FIGS. 5 and 6, a plurality of the suction ports 2 are formed at equal circumferential intervals on the outer circumference of the nozzle cover 42.

  As shown in detail in FIG. 9A, each downstream venturi tube 12b of the nozzle body 29 has an upstream inlet portion 12c formed in an outward trumpet shape, and a short straight portion 12d formed immediately downstream thereof. On the downstream side, a long tapered portion 12e whose diameter is increased from the upstream side toward the downstream side is formed. An end portion (exit portion) 12f on the discharge side of the tapered portion 12e is formed in an outward trumpet shape.

Further, as shown in FIGS. 6 and 7A, the holder 37 is formed with a cylindrical portion 37b surrounding each of the inner diameter portions of all the venturi tubes 12b. The cylindrical portion 37b is formed in a tapered hole whose diameter increases from the upstream side toward the downstream side. Note that the holder 37, is necessary to form a cylindrical portion 37b surrounding the inner diameter of all of the venturi tube 12b not necessarily, a cylindrical portion 37b surrounding the inner diameter of at least one Venturi tube 12b What is necessary is just to form.

The end portion of the cylindrical portion 37b of the holder 37 on the nozzle body 29 side is brought into contact with the discharge-side end portion 12f of the downstream venturi tube 12b in contact with the end portion of the cylindrical portion 37b on the nozzle body 29 side. The diameter D1 of the portion is set to a smaller diameter (D1 <D2) than the diameter D2 of the discharge-side end portion 12f of the downstream venturi tube 12b, so that an edge is formed at the discharge-side end portion 12f of the downstream venturi tube 12b. 12g is formed ( consisting of a recess having a substantially V-shaped cross section in a side view and a projecting portion provided on the downstream side of the recess and projecting into the flow path) .

  In the case of the discharge nozzle 30 configured as described above, as shown in FIG. 6, the hot water in which the air has been dissolved flows from the outflow pipe 11 to the upstream side venturi pipe of the nozzle case 31 as indicated by an arrow a. By discharging into the bath water in the bathtub 1 from the discharge port 3 of the nozzle cover 42 via 12a and the downstream venturi pipe 12b, dissolved air precipitates in the bath water and fine bubbles are generated.

  Further, 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, and passes through the through hole 41e of the closing portion 41d of the fixing flange 41, as shown in FIG. As described above, the electric pump 6 is sucked from the connecting pipe 5 connected to the outer side of the nozzle case 31.

  Then, by forming an edge 12g at the end 12f on the discharge side of the downstream venturi pipe 12b of the discharge nozzle 30, as shown in FIG. 9A, the edge 12g and the eddy current generated on the downstream side of the edge 12g. As a result, the fine bubbles are forcibly divided and further refined, so that the generation amount of the fine bubbles is greatly increased.

  In this way, the amount of fine bubbles generated can be reduced with a simple configuration in which the edge 12g is formed at the discharge-side end 12f of the downstream venturi pipe 12b of the discharge nozzle 30 without using a large-scale device or a long path. It can be greatly increased and the cloudiness can be improved.

  Further, the nozzle body 29 having the downstream side venturi tube 12b and the holder 27 having the cylindrical portion 27b are configured, and the downstream side venturi tube 12b is simply assembled by assembling the nozzle body 29 and the holder 27. A minute edge 12g can be easily formed on the discharge-side end 12f.

Further, by surrounding each of the cylindrical portions 37b of the holder 37 around the inner diameter portion of all the downstream venturi tubes 12b, the number of edges 12g is increased, so that the generation amount of fine bubbles is further increased.

  Further, by gradually depressurizing the cylindrical portion 37b of the holder 37 as a tapered hole that expands from the upstream side toward the downstream side, the finer fine bubbles are further reduced in outer diameter required for white turbidity. It can be gradually grown (larger).

  In the embodiment of FIG. 9B, the diameter D3 of the end portion on the nozzle body 29 side of the cylindrical portion 37b is made smaller than the diameter D1 of the embodiment of FIG. 9A (D3 <D1 <D2). As a result, the edge 12g of the discharge-side end portion 12f of the downstream side venturi tube 12b is formed deeper, so that the generation amount of fine bubbles is further increased.

In each of the above embodiments, the cylindrical portion 37b that surrounds the circumference of the inner diameter portion of all the venturi tubes 12b (the cylindrical portion 37b that surrounds the circumference of the inner diameter portion of at least one venturi tube 12b may be formed). Although formed in the holder 37, as shown in FIGS. 10A to 10D, the plate-like closing portion 37c of the holder 37 has a plurality of (in this example, six) downstream sides of the central portion. A large-diameter cylindrical portion 37b surrounding the outermost periphery of the inner diameter portion of the venturi tube 12b can also be formed.

  In this case, the diameter D4 of the end portion of the cylindrical portion 37b on the nozzle body 29 side is smaller than the circumscribed circle D5 of the discharge-side end portions 12f of the plurality of downstream venturi tubes 12b in the central portion (D4 < By setting to D5), the edge 12g can be formed at the discharge-side end portions 12f of the plurality of downstream venturi tubes 12b in the central portion. Further, the outer diameter D6 of the end portion of the cylindrical portion 37b on the nozzle body 29 side is larger than the inscribed circle D7 of the discharge-side end portions 12f of the plurality of downstream venturi tubes 12b in the outer peripheral portion (D7 < By setting to D6), the edge 12g can be formed at the discharge-side end portions 12f of the plurality of downstream-side venturi tubes 12b in the outer peripheral portion. In order to secure a plurality of (in this example, 10) downstream venturi pipes 12b in the outer peripheral portion, a plurality of (in this example, 4) circles are provided in the plate-like closed portion 37c of the holder 37. An arc-shaped opening 37d is opened.

  Even in this configuration, the nozzle main body 29 formed with the downstream venturi tube 12b and the holder 37 formed with the tubular portion 37b are configured with two parts, and the nozzle main body 29 and the holder 39 are assembled. A minute edge 12g can be easily formed at the discharge-side end portion 12f of the plurality of downstream venturi tubes 12b.

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

DESCRIPTION OF SYMBOLS 1 Bathtub 2 Suction port 3 Discharge port 8 Air dissolution apparatus 12b Downstream venturi pipe (pressure reduction means)
12f End portion 12g on discharge side Edge 30 Discharge nozzle 37 Holder 37b Tubular portion

Claims (2)

A fine bubble generating device that discharges pressure from a discharge nozzle while releasing pressure with a decompression unit and generating a fine bubble by releasing air-water dissolved fluid in which air is pressurized and dissolved in water,
The discharge nozzle is provided with the pressure-reducing means, and the pressure-reducing means is constituted by a venturi tube, and is provided at a discharge-side end portion of the venturi tube at a substantially V-shaped cross section in a side view and downstream of the recess. The fine bubble generating device is characterized in that an edge made of a protruding portion having a substantially right-angle cross section protruding into the flow path is formed. To the discharge nozzle, the pressure reducing means plurality of nozzle body venturi is formed is provided a an end portion of the discharge side of the nozzle body, a holder extending in the discharge direction is provided on the holder A cylindrical portion surrounding the outermost periphery of the inner diameter portion of the plurality of venturi tubes in the central portion is formed, and an end portion of the cylindrical portion on the nozzle body side is brought close to an end portion on the discharge side of the venturi tube The diameter of the end portion on the nozzle body side of the cylindrical portion is set to be smaller than the circumscribed circle of the discharge side end portions of the plurality of venturi tubes in the central portion, so that the plurality of venturi tubes in the center portion 2. The fine bubble generating device according to claim 1 , wherein an edge is formed at an end of the discharge side of the liquid.

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