JP2008149038A - Microbubble generator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a microbubble generator improving white turbidity of bathwater or the like. <P>SOLUTION: This microbubble generator releases a pressure of gas-liquid dissolved fluid formed by pressurizingly dissolving gas in liquid by a decompression means to generate microbubbles and jettingly discharge the microbubbles from a discharge nozzle 30, the discharge nozzle 30 has the decompression means (a venturi tube 12b or a disk nozzle 48), a mesh 43 formed of a netted body is disposed between the decompression means and an outlet 3 of the discharge nozzle 30 at a prescribed interval W apart from the decompression means. This constitution can form a pressure retention space 45 between the decompression means and the mesh 43 by distribution resistance of the mesh 43 so as to prevent coalition of microbubbles generated by the decompression means in the pressure retention space 45 and improve the white turbidity of the bathwater or the like. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a fine bubble generating device that improves white turbidity such as bath water.

2. Description of the Related Art Conventionally, there is a fine bubble generating device in which a gas-liquid dissolved fluid in which a gas is pressurized and dissolved in a liquid is released by a decompression unit and ejected and discharged from a discharge nozzle into a bathtub while generating fine bubbles ( Patent Document 1).
JP-A-11-33071

  When pressure reducing means (Venturi tube, disk nozzle, etc.) is provided in the nozzle body of the discharge nozzle of the fine bubble generator as described above, fine bubbles are caused by variations in the tube diameter in the Venturi tube and in the disk gap in the disk nozzle. There was a problem that the white turbidity of the water fluctuated and the white turbidity of the bath water deteriorated.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a fine bubble generating device that improves white turbidity such as bath water.

  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. In the apparatus, the discharge nozzle is provided with the pressure reducing means, and a mesh made of a wire mesh is disposed between the pressure reducing means and the discharge port of the discharge nozzle with a certain distance from the pressure reducing means. The present invention provides a microbubble generator characterized by the above.

  The decompression means may be a venturi tube or a venturi tube group as in claim 2 or a disk nozzle as in claim 3.

  According to the present invention, since the mesh made of the wire mesh body is arranged at a predetermined interval from the pressure reducing means of the discharge nozzle, a pressure maintaining space is formed between the pressure reducing means and the mesh due to the flow resistance of the mesh. As a result, coalescence of fine bubbles generated by the decompression means is prevented in the pressure maintaining space, so that fine bubbles that do not coalesce are ejected from the discharge port of the nozzle body, improving the cloudiness of bath water and the like To come.

  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 pump 6 through the connection pipe 5, and the discharge side of the pump 6 is connected to the injection port 9 on the suction side of the gas dissolving device 8 through 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 an inflow pipe 7 between the pump 6 and the gas dissolving device 8 via a connection pipe 14, and a check valve 15 is provided in the connection pipe 14.

  And when the hot water which gas melt | dissolved is discharged in the bath water in the bathtub 1 from the discharge outlet 3, dissolved gas will precipitate in bath water and a fine bubble will come to be generated.

  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 (refer to the one-dot chain line in FIG. 2) of the side wall portion 21 that is formed of the cylindrical body 23 and has a longitudinal direction, that is, substantially cylindrical, is 10 to 45 degrees with respect to the horizontal direction (see the arrow in FIG. 2). It is arrange | positioned with the attitude | position which inclines with the inclination-angle (theta) of this.

  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. It becomes the liquid storage part 26 to be performed.

  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.

  The side wall 21 of the cylindrical body 23 is formed with an air vent 27 provided with a valve (not shown). The position of the air vent 27 is stored in the gas reservoir 25 and the gas reservoir 26. 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 jetted from the jet port 9, they collide with the inner wall surface on the upper side of the side wall portion 21 facing the jet 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 ejected, 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 accelerated.

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

  5 and 6 are microbubble generators embodying the basic configuration shown in FIGS. 1 to 4. The same configuration as the basic configuration is given the same number, and the detailed description is omitted.

  A discharge nozzle 30 is attached to the side wall 1a (see FIG. 6) of the bathtub 1, and the above-described suction port 2, discharge port 3, venturi tube 12 (12a, 12b) and the like are incorporated into the discharge nozzle 30 as a unit. ing.

  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.

  As shown in detail in FIGS. 9 (a) and 9 (b), the nozzle body 29 has a cylindrical fitting portion for fitting into the outlet side (lateral portion) of the nozzle case 31 via the O-ring 33. 29a, a cylindrical protruding portion 29b protruding forward (discharge direction) from the fitting portion 29a, and a plate-like blocking portion 29c formed between the cylindrical protruding portion 29b and the fitting portion 29a. The inner and outer double concentric circles are set in 29c, and a plurality of (six in this example) downstream venturi tubes 12b are formed at equal circumferential intervals along the inner small-diameter circle. A plurality (10 in this example) of the downstream venturi pipes 12b are formed along the radial circle 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.

  Returning to FIG. 6, referring to FIG. 7, a cylindrical sound absorbing sheet 35 is fitted on the inner peripheral surface of the protruding portion 29 b of the nozzle body 29, and on the inner peripheral surface of the sound absorbing sheet 35, A cylindrical silent mesh (metal mesh) 36 is fitted inside, and the female screw 37a of the cylindrical mesh holder 37 is screwed into the male screw 29d at the front end of the protruding portion 29b, whereby the sound absorbing sheet 35 and the silent sound are inserted into the protruding portion 29b. The mesh 36 is held so as not to move.

  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 periphery of the mesh 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 along the inner small-diameter circle at equal angular intervals on the circumference, and along the outer large-diameter circle, the inner small-diameter circle through-holes 41e are shifted by a half pitch, 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 blocking portion 41 d and the outer peripheral surface of the mesh 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. A mesh (metal mesh body ... see chain line) 43 is attached to the suction port 2 and the discharge port 3 of the nozzle cover 42.

  The mesh 43 of the discharge port 3 of the nozzle cover 42 is sandwiched and held between the rear end of the nozzle cover 42 and the tip of the mesh holder 37, and the mesh 43 of the suction port 2 of the nozzle cover 42 is It can be formed by bending backward from the portion so as to cover the suction port 2. Note that meshes 43 may be individually attached to the suction port 2 and the discharge port 3 of the nozzle cover 42.

  In the case of the discharge nozzle 30 configured as described above, as shown in FIG. 6, the hot and cold water in which the gas is dissolved flows from the outflow pipe 11 to the upstream side venturi pipe 31a 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 through 12a and the downstream venturi pipe 12b, dissolved gas 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 pump 6 is sucked from the connecting pipe 5 connected to the outer side of the nozzle case 31.

  In the configuration of the discharge nozzle 30 described above, the venturi tube 12b is spaced from the venturi tube 12b at a constant interval between the venturi tube 12b which is a decompression means provided in the nozzle body 29 of the discharge nozzle 30 and the discharge port 3 of the nozzle cover 42 of the discharge nozzle 30. A mesh 43 made of a wire mesh body is arranged across W.

  The mesh 43 is preferably, for example, 20 to 40 mesh, particularly about 30 mesh and a SUS wire mesh having a wire diameter of 0.29 mm, and may be punched metal.

  In this way, the mesh 43 made of a wire mesh body is arranged at a predetermined interval W from the venturi tube 12b of the nozzle body 29, so that the pressure between the venturi tube 12b and the mesh 43 is caused by the flow resistance of the mesh 43. By forming the maintenance space 45, coalescence of the fine bubbles generated in the venturi tube 12b is prevented in the pressure maintenance space 45, so that the fine bubbles that do not coalesce are ejected from the ejection port 3 of the ejection nozzle 30. As a result, the cloudiness of the bath water and the like is improved. Note that the mesh 43 is also provided in the suction port 2 of the nozzle cover 42 of the nozzle body 30, thereby preventing dust from being sucked in, but may not be particularly required.

  In the above embodiment, the mesh 43 is provided between the nozzle cover 42 and the mesh holder 37. Instead of this, as shown by the arrow C in FIG. The mesh 43 can be sandwiched and held between the rear end of the mesh holder 37.

  In the above embodiment, the pressure reducing means is the venturi tube 12b, but it may be a disk nozzle. That is, as shown in FIG. 10, instead of the venturi tube 12, a supply-side nozzle 46 having a decompression opening 46a at the center is provided. The decompression opening 46a is for discharging hot water with dissolved gas and releasing the pressure.

  In addition, a discharge-side nozzle 47 is provided in front of the supply-side nozzle 46, and a pressure release surface 47a is formed at the rear end of the discharge-side nozzle 47 so as to face the decompression opening 46a with a predetermined gap therebetween. Around the surface 47a, a plurality of discharge holes 47b are formed at equal angular intervals on the circumference. The discharge hole 47b is for ejecting fine bubbles generated in the gap into the bathtub 1.

  The supply-side nozzle 46 and the discharge-side nozzle 47 constitute a disk nozzle 48, and the mesh 43 can be provided between the nozzle cover 42 and the mesh holder 37 in the disk nozzle 48. Alternatively, a mesh 43 may be provided at the tip of the discharge side nozzle 47 as indicated by the arrow D in FIG.

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 the venturi pipe | tube of FIG. It is a disassembled perspective view of a nozzle body, a sound absorbing sheet, a silent mesh, and a mesh holder. It is a fixed flange, (a) is a front view, (b) is a side sectional view. It is a nozzle body, (a) is a perspective view, (b) is a side sectional view. It is sectional drawing of the discharge nozzle which has a disk nozzle.

Explanation of symbols

1 Bathtub 2 Suction Port 3 Discharge Port 8 Gas Dissolving Device 12a Upstream Venturi Tube 12b Downstream Venturi Tube 12c Discharge Port 29 Nozzle Main Body 29b Tubular Projection 30 Discharge Nozzle 31 Nozzle Case 41 Fixed Flange 42 Nozzle Cover 43 Mesh 45 Pressure Maintenance Space 48 Disc nozzle W Fixed interval

Claims (3)

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 generator that ejects and discharges from a discharge nozzle while generating fine bubbles,
The discharge nozzle is provided with the pressure reducing means, and a mesh made of a wire mesh is arranged between the pressure reducing means and the discharge port of the discharge nozzle at a predetermined interval from the pressure reducing means. Bubble generator.   The microbubble generator according to claim 1, wherein the decompression means is a Venturi tube or a Venturi tube group.   2. The fine bubble generating apparatus according to claim 1, wherein the decompression means is a disk nozzle.

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