JP2005118542A - Microbubble generator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a delivery valve for a bubble generator having a simple structure, without forming bubble coalescence, without generating an abnormal sound, easy in removal and maintenance. <P>SOLUTION: This delivery valve 21 is composed of a supply side nozzle part 32 forming a substantially columnar shape, and a delivery side nozzle part 33. At this time, opposed parallel surfaces of the supply side nozzle part 32 and the delivery side nozzle part 33 are threadedly engaged with a distance of clearance S. A U-shaped groove 41 having an inner diameter L3 and a width L4 is formed around a central shaft in the supply side nozzle part 32. A recessed groove 46 is formed around the central shaft in a position (an inner diameter L3 and a width L4) corresponding to the U-shaped groove 41 on a bottom surface of an inside hollowed-out part of the delivery side nozzle part 33 facing the supply side nozzle part 32. In this delivery valve 21, eight tapered delivery holes 47 are arranged on the circumference to reach one end part of the delivery side nozzle part 33 from a bottom surface of the recessed groove 46 (the depth L7). <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention is used in a bubble generating device that circulates a liquid in a liquid tank (tub), mixes and dissolves gas (air) and supplies fine bubbles in the liquid, and pressurizes and dissolves the gas in the liquid. The present invention relates to a structure of a discharge valve that ejects fine bubbles into a liquid tank.

  In recent years, there has been an increasing need to enjoy a comfortable bath by jetting a liquid containing air into a bathtub and enjoying a comfortable bath with a jet stream containing fine bubbles, and also expecting a thermal effect, a massage effect, and a cleaning effect in terms of health. Yes. Therefore, there is a demand for a bubble generating device that can generate bubbles stably by using an inexpensive, low-pressure, and quiet pump.

  In such a bubble generating device, after the liquid in the bathtub is circulated to mix and dissolve the gas, the gas is pressurized and dissolved in the liquid, and then the jet flow containing fine bubbles is discharged to the bathtub by the pressure reducing valve as the discharge valve. It is configured to erupt inside. The configuration of the pressure reducing valve includes a method in which a fine mesh is passed through the metal mesh while increasing the flow velocity, a method using a venturi tube, a method using a disk valve, and the like.

  In addition, in order to prevent clogging of the pressure reducing valve for generating fine bubbles, a control device that controls the cleaning of the pressure reducing valve by changing the flow of water at the end of the generation of fine bubbles is provided. Regardless of the presence or absence of clogging foreign matter or the like, automatic cleaning is also considered, and Patent Document 1 is disclosed as such a bubble generating device.

As a result, fine bubbles can be stably generated during re-operation.
Japanese Patent Laid-Open No. 6-169962

However, as a method of the pressure reducing valve of the conventional bubble generating device, the method of passing the fine holes and colliding with the metal mesh while increasing the flow velocity is effective when used at a high pressure, but the pump is expensive and conversely inexpensive. Sufficient cloudiness cannot be obtained with a low-pressure pump.
Although the venturi system is effective even at low pressure, a high jet noise in the venturi section (when the gas-liquid melt passes through the pressure reducing valve, depending on the throttle region of the pressure reducing valve, the fluid may be There is a disadvantage that a peculiar noise) occurs.
In addition, the disc valve method is excellent in that it can handle low pressures and has low noise, but it has a high cost, and there are problems of manual adjustment to obtain optimal cloudiness while adjusting the pressure. .

  Further, since it is difficult to adjust the gap between the disks, there is a problem that adjacent bubbles are combined into large bubbles immediately after the gas-liquid melt passes through the pressure reducing valve and fine bubbles are generated.

  In addition, when any of the above methods is used as a bathing facility, there is a problem that when the clogged portion is clogged with dust, the work space is limited and maintenance is difficult.

  And, when the pressure reducing valve is automatically cleaned to eliminate the trouble of maintenance, a pipe and a switching valve for switching the flow of water are necessary, and further, since it is necessary to provide a cleaning control device, there is a problem that the cost increases. there were.

  Furthermore, even with an automated cleaning control device, there is a problem that clogging or the like is inevitably generated when used for a long period of time, and it becomes necessary to perform disassembly and cleaning.

  The present invention has been made in consideration of the above-described circumstances. The discharge valve of the bubble generating device has a simple structure with a low cost, has no bubble coalescence, and stably stabilizes the bubbles to a certain size. An object is to provide a discharge valve that does not occur and is easy to remove and easy to maintain.

In order to achieve the above object, a first aspect of the present invention is directed to a vortex for generating a vortex in a fluid after depressurization in a microbubble generator having a discharge valve for generating a microbubble by depressurizing a gas-liquid mixed fluid. A generation region is provided in the discharge valve.
With this fine bubble generating device, a vortex is generated in the gas-liquid mixed fluid, whereby a small bubble of a certain size or less is discharged from the outside of the vortex. Here, the gas-liquid mixed fluid includes not only a fluid (gas-liquid two-phase fluid) in which a gas and a liquid coexist, but also a fluid in which a gas is dissolved in a liquid (gas-liquid dissolved fluid). .

  A second aspect of the present invention is the fine bubble generating device according to the first aspect, wherein the gas-liquid mixed fluid is a gas-liquid dissolving fluid. With this fine bubble generating device, the gas dissolved in the liquid is generated as bubbles by decompression, so that fine bubbles can be generated efficiently, and the small size below a certain size due to the generation of vortices Bubbles are ejected from the outside of the vortex.

  A third aspect of the present invention is the fine bubble generating device according to the first or second aspect, wherein the vortex generating region includes an inlet and an outlet, and the gas-liquid communicates with the inlet and the outlet. The inflow direction and the outflow direction of the mixed fluid are not in a straight line, and the width corresponding to the vortex surface of the vortex generation region is provided wider than the widths of the inlet and outlet of the gas-liquid mixed fluid. Yes. In this fine bubble generating device, the inflow direction and the outflow direction are not linear, and the vortex generation region is wider than the widths of the inflow port and the outflow port, so vortices are easily generated.

  A fourth aspect of the present invention is the microbubble generator according to the third aspect, wherein the inflow direction and the outflow direction of the gas-liquid mixed fluid communicating with the inflow port and the outflow port of the vortex generation region are substantially perpendicular to each other. The vortex generation region includes a main vortex generation region that extends in the outflow direction including the extension region of the inflow port, and a sub-vortex generation that extends in the direction opposite to the outflow direction from the end opposite to the outflow port of the inflow port It is characterized by consisting of a region. With this fine bubble generating device, since there is no wall on the extension line of the end portion on the opposite side to the outlet of the inflow port, resistance to vortices in the vortex generation region can be reduced.

  A fifth aspect of the present invention is the fine bubble generating device according to any one of the first to fourth aspects, wherein the vortex generating region is provided in an annular shape. With this fine bubble generating device, the vortex generation region is provided in an annular shape, so that the vortex can be stably formed in an annular shape.

  A sixth aspect of the present invention is the fine bubble generating device according to the fourth or fifth aspect, wherein corners of the inlet of the annular vortex generating region are cut off. With this fine bubble generator, the pressure loss at the inlet can be reduced.

  A seventh aspect of the invention is the fine bubble generating device according to the fifth or sixth aspect, wherein the outflow port communicating with the vortex generation region is an annular slit. With this fine bubble generating device, the gas-liquid mixed fluid can be discharged from the outside of the vortex generated in the vortex generating region.

  The invention according to claim 8 is the fine bubble generating device according to claim 5 or 6, wherein the outlets communicating with the vortex generating region are a plurality of outlets arranged in an annular shape. It is said. With this fine bubble generating device, the vortex generated in the vortex generating region once becomes an annular vortex and then discharged to a plurality of outlets, so that the rotational speed of the vortex is accelerated.

A ninth aspect of the present invention is the fine bubble generating device according to any one of the first to eighth aspects, wherein the fine bubble generating device is configured such that the liquid in the liquid tank is circulated and gas is contained in the liquid. The supply side nozzle from which the gas-liquid dissolved fluid is discharged is provided with the discharge valve for releasing the pressure and dissolving the gas-liquid mixed fluid into the liquid tank and generating fine bubbles. And a discharge-side nozzle portion that discharges fine bubble water containing the generated fine bubbles into the liquid tank, and the supply-side nozzle portion includes a substantially cylindrical supply-side nozzle body and one surface of the nozzle body. The discharge nozzle is composed of a decompression opening that is provided at the center of the pressure side and discharges the gas-liquid dissolved fluid that is pressurized and dissolved, and the pressure is released, and an opening peripheral surface that is provided at the opening periphery of the decompression opening. The part is a substantially cylindrical discharge side nozzle body and this discharge side nozzle book A pressure release surface provided on the body and facing the decompression opening and provided through a predetermined gap with the peripheral edge surface of the opening, and a concave groove (the vortex generation region) disposed around the pressure release surface. )
A discharge hole (the outlet) through which the fine bubbles formed between the peripheral edge surface of the opening and the pressure release surface (the inlet) are discharged into the liquid tank is a concave groove (the above-mentioned outlet). It is formed at the bottom of the vortex generation region.

  With this fine bubble generator, a vortex can be easily generated in the gas-liquid mixed fluid, and small bubbles of a certain size or less can be reliably discharged from the outside of the vortex.

  A tenth aspect of the present invention is the fine bubble generating device according to the ninth aspect, wherein a concave groove (around the pressure reducing opening of the supply side nozzle portion is provided at a position facing the concave groove of the discharge side nozzle portion. The sub-vortex generation region) is formed.

  With this fine bubble generating device, the resistance in the middle portion of the vortex generating region and the sub vortex generating region can be reduced, so that the initial velocity of the vortex generated in the gas-liquid mixed fluid can be maintained.

  The invention of claim 11 is the fine bubble generating device according to claim 9 or claim 10, wherein the concave grooves facing the discharge side nozzle part and the supply side nozzle part are respectively U-shaped curves. It is formed by an inner wall. With this fine bubble generating device, resistance in each of the vortex generating region and the sub-vortex generating region can be reduced by the U-shaped curved inner wall, so that the initial velocity of the vortex generated in the gas-liquid mixed fluid is maintained. be able to.

  A twelfth aspect of the invention is the fine bubble generating device according to any one of the ninth to eleventh aspects, wherein an L-shaped concave groove is formed on an outer periphery of the supply side nozzle body, and the discharge The inner peripheral wall of the side nozzle main body is provided with a convex portion that engages with the concave groove when the supply side nozzle main body is inserted inside the discharge side nozzle main body. With this fine bubble generator, the discharge valve can be easily removed.

  A thirteenth aspect of the present invention is a discharge valve used in the fine bubble generating device according to any one of the first to twelfth aspects. With this discharge valve, a vortex is generated in the gas-liquid mixed fluid, whereby small bubbles of a certain size or less are discharged from the outside of the vortex.

  According to the first aspect of the present invention, vortices are generated in the gas-liquid mixed fluid, whereby small bubbles of a certain size or less are discharged from the outside of the vortex. Therefore, it is possible to stably discharge the bubbles to a certain size.

  According to the second aspect of the present invention, vortices are generated in the gas-liquid dissolving fluid, whereby small bubbles of a certain size or less are discharged from the outside of the vortex. Therefore, it is possible to stably discharge the bubbles to a certain size.

  According to the invention of claim 3, vortices are easily generated. Therefore, it is possible to stably discharge the bubbles to a certain size.

  According to the invention of claim 4, the resistance in the vortex generation region can be reduced. Therefore, the rotational speed of the vortex can be increased efficiently, so that the bubbles can be stably discharged to a certain size.

  According to the invention of claim 5, the vortex can be stably formed in an annular shape. For this reason, it is possible to stably discharge bubbles in a certain size from the center of the discharge valve, which is the annular center.

  According to invention of Claim 6, the pressure loss of an inflow port can be decreased. Therefore, the generation of abnormal noise can be prevented. Moreover, since the corner | angular part of an inflow port is shaved, it can prevent that an adjacent bubble merges and becomes a big bubble. Since pressure loss is reduced, the load on the pump can be reduced.

  According to the seventh aspect of the invention, the gas-liquid mixed fluid can be discharged from the outside of the vortex. Therefore, it is possible to stably discharge the bubbles to a certain size.

  According to invention of Claim 8, the rotational speed of a vortex is accelerated and a bubble can be stably discharged to a fixed magnitude | size.

  According to the ninth aspect of the present invention, a vortex is generated in the gas-liquid mixed fluid, so that small bubbles having a certain size or less are reliably discharged from the outside of the vortex. Therefore, it is possible to eliminate the possibility that adjacent fine bubbles merge and grow into large bubbles. In addition, it has a simple structure with low cost, can be easily removed and attached, and can be easily maintained.

  According to the invention of claim 10, the initial velocity of the vortex generated in the gas-liquid mixed fluid can be maintained. For this reason, small bubbles of a certain size or less are reliably discharged from the outside of the vortex. Generation of abnormal noise in the discharge valve can be eliminated.

  According to the eleventh aspect of the present invention, the initial velocity of the vortex generated in the gas-liquid mixed fluid can be maintained. For this reason, small bubbles of a certain size or less are reliably discharged from the outside of the vortex. Further, the generation of abnormal noise in the discharge valve can be eliminated.

  According to the twelfth aspect of the present invention, it is easy to remove and attach the discharge valve and to perform maintenance.

  According to the thirteenth aspect of the present invention, a vortex is generated in the gas-liquid mixed fluid, whereby small bubbles of a certain size or less are discharged from the outside of the vortex. Therefore, it is possible to stably discharge the bubbles to a certain size.

<First Embodiment of the Present Invention>
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1, 2A, 2B, 3A, and 3B.

<Configuration of microbubble generator>
As shown in FIG. 1, a microbubble generator 70 according to the present invention includes a discharge valve 21 that depressurizes a gas-liquid mixed fluid to generate microbubbles. A vortex generating region (concave groove 46) for generating the discharge valve 21 is provided.

As described above, the gas-liquid mixed fluid is not only a fluid in which gas and liquid coexist (gas-liquid two-phase fluid) but also a liquid in which gas is dissolved (gas-liquid dissolving fluid). Is also included.
Now, the gas-liquid mixed fluid will be described as being used after the gas-liquid mixed fluid is converted into a gas-liquid dissolved fluid using a gas-liquid dissolving tank.

  The discharge valve 21 has a supply-side nozzle portion 32 through which gas-liquid dissolved fluid is discharged through the flow paths P1 and P2, and a discharge side through which fine bubble water containing the generated fine bubbles is discharged into the liquid tank 12a through the flow path P3. The nozzle portion 33 is formed.

  And the supply side nozzle part 32 is provided in the center of the substantially cylindrical supply side nozzle main body 32a and the one surface side of this supply side nozzle main body 32a, and while the gas-liquid dissolved fluid pressurized and dissolved is discharged. The pressure reducing opening 32b is opened from the pressure, and the opening peripheral surface 32c provided on the opening peripheral edge of the pressure reducing opening 32b.

  Further, the discharge nozzle portion 33 is provided in a substantially cylindrical discharge-side nozzle main body 33a, and is provided on the discharge-side nozzle main body 33a so as to face the decompression opening 32b and through the opening peripheral surface 32c and a predetermined gap S. The pressure release surface 33b and a concave groove 46 (vortex generating region) disposed around the pressure release surface 33b.

  Furthermore, a plurality of discharge holes 47 through which fine bubbles formed between the opening peripheral surface 32c and the pressure release surface 33b are discharged to the bathtub (liquid tank) 12a are formed at the bottom of the concave groove 46 of the pressure release surface 33b. ing. A U-shaped groove 41 is formed around the decompression opening 32 b of the supply side nozzle portion 32 at a position facing the concave groove 46 of the discharge nozzle portion 33.

  The substantially cylindrical discharge valve 21 is formed by the supply-side nozzle portion 32 and the discharge-side nozzle portion 33, and is further screwed integrally with the nozzle cover 34 to be built in the discharge mouthpiece 30. .

 The discharge port metal 30 is composed of a discharge port 90 degree elbow 31, a Z-shaped sleeve 35 and a cover 36. And the one end part of the discharge port 90 degree elbow 31 is provided in the outer peripheral side of the female screw 31a provided in the inner peripheral side of the one end part, and the one end part of the Z-shaped sleeve 35 inserted in the discharge port 22 from the bathtub inner side. The discharge port 22 of the bathtub 12a is clamped to the bathtub 12a by screwing with the male screw 35a. At this time, since the periphery of the discharge port 22 is covered with the rubber ring 37, the discharge port 90 degree elbow 31 and the bathtub 12a are connected in a waterproof state.

  Furthermore, the other end of the discharge port 90 degree elbow 31 is waterproofly fixed to the discharge pipe 18 in order to guide the gas-liquid dissolved fluid from the discharge pipe 18 to the bathtub 12a. Therefore, the gas-liquid dissolved fluid from the discharge pipe 18 is guided to the bathtub 12a through the discharge valve 21 covered with the discharge fitting 30 without leaking.

Here, one end portion of the discharge valve 21 includes a tip end portion 34 a of the nozzle cover 34 and a flange 43 on the outer side surface of the discharge side nozzle portion 33, a flange inner surface 35 b of one end portion of the Z-shaped sleeve 35, and the other end portion of the cover 36. It is fixed by being pinched by 36b. (The female screw 36a at one end of the cover 36 is screwed into the male screw 35c at the other end of the Z-shaped sleeve 35, and the other end of the cover 36 moves the tip 34a of the nozzle cover 34 by the screwing force. Press.)
Further, the other end portion of the discharge valve 21 is held in a watertight manner with the discharge port 90 degree elbow 31 through an O-ring 38 provided on the outer periphery of one end portion of the supply side nozzle portion 32.

  In this manner, the discharge valve 21 (the supply side nozzle portion 32 and the discharge side nozzle portion 33) and the nozzle cover 34 are integrally configured, and one end portion is fixed and the other end portion is held, and the discharge mouthpiece 30 is held inside. It is held stably.

  Then, when the fine bubble water is discharged from the flow path P3, the fine bubble water is discharged to the liquid tank (tub) 12a through the opening 34b of the tip end portion 34a of the nozzle cover 34 and the opening 36c of the cover 36.

  As shown in FIG. 2, the supply-side nozzle portion 32 has a substantially cylindrical shape having a flange 40 (diameter L8) at the bottom, and a groove 40a is formed in the center of the flange 40 over the circumference. As described above, the O-ring 38 is inserted. A male screw 42 is machined on the outer peripheral portion (diameter L9) other than the flange 40. Further, a taper hole 39 having a diameter L1 at one end and a diameter L2 near the other end facing the discharge side nozzle portion 33 is machined at the center of the supply side nozzle portion 32. At this time, L1> L2. Further, a U-shaped groove 41 having an inner diameter L3 and a width L4 is formed in an annular shape around the central axis on the upper surface.

  As shown in FIG. 3, the discharge-side nozzle portion 33 has a substantially cylindrical shape (diameter L8) having a flange 43 (diameter L10) in the vicinity of one end, and the flange 43 is formed over the circumference. A male screw 44 is machined between one end of the discharge side nozzle portion 33. Further, a female screw 45a is machined on the inner peripheral surface of the center turning portion 45 at the other end of the discharge side nozzle portion 33 (diameter L9). A concave groove 46 is annularly formed around the central axis at a position corresponding to the U-shaped groove 41 (inner diameter L3 and width L4) on the bottom surface of the centered portion 45 at the other end facing the supply-side nozzle portion 32. Is formed. Furthermore, eight tapered discharge holes 47 are provided on the circumference from the bottom surface of the concave groove 46 (depth L7) to one end of the discharge side nozzle portion 33 (L7> L6, L4> L6). .

  Thus, the substantially cylindrical discharge valve 21 is formed on the outer peripheral surface of the substantially cylindrical supply-side nozzle portion 32 and on the inner peripheral surface of the intermediate portion 45 of the discharge-side nozzle portion 33. The female screw 45a thus screwed together is integrated. At this time, the opposing parallel surfaces of the supply side nozzle part 32 and the discharge side nozzle part 33 are set to the distance of the gap S.

  Further, one end surface of the nozzle cover 34 is screwed into a female screw 34 c formed on the inner peripheral surface of the nozzle cover 34 and a male screw 44 formed on the outer peripheral surface of the discharge side nozzle portion 33, so that it is integrated with the discharge valve 21. It has become. At this time, the other end surface of the nozzle cover 34 on the bathtub 12 a side is formed in a flange shape 34 b in order to receive a pressing force from one end portion of the cover 36.

Next, it demonstrates along the flow of the liquid of the discharge valve 21. FIG. The liquid is discharged from the discharge pipe 18 through the flow paths P1 to P2 to P3. If the positions where the cross sections of the flow paths in the discharge valve 21 change are A, B, C, D, and E, respectively, A The cross-sectional area at the position is formed to have the same area as the total cross-sectional area at the eight positions at the E position. The internal pressure at position A is set to approximately 2 kg / cm ² .

Here, the position B is the place where the internal pressure is the highest. Therefore, in the region where the supply-side nozzle portion 32 and the discharge-side nozzle portion 33 face each other, the relationship between the cross-sectional area of the position A where the tapered hole 39 is opened and the position B where the tapered hole 39 is opened is Let S be the gap between the parallel surfaces of the side nozzle portion 32 and the discharge side nozzle portion 33 facing each other.
S <{π (L2 × L2) / 4} / (πxL2) = L2 / 4
The gap S is set so that the following relationship is obtained.

In the embodiment, L2 = 6.7 mm and S = 0.65 mm.
Note that L3 = 14 mm.

<System of microbubble generator>
The system of the fine bubble generator will be described with reference to FIG.

  As shown in FIG. 4, the inside of the bathtub main body 12 is all except that the ON / OFF control panel 26 of the circulation pump 17 as the gas-liquid mixed pressure feeding means is disposed at a position where the hand of the bathtub main body 12 is easily accessible. Is stored compactly. FIG. 4 shows a state in which the liquid 27b is sucked from the suction port 13 in the bathtub 12a by the operation of the circulation pump 17, and is then again ejected from the discharge port 22 into the bathtub 12a as the fine bubble water 28. Therefore, the user can use the fine bubble water 28 by starting and stopping the ejection of the fine bubble water 28 by turning on and off the switch of the control panel 26 as necessary.

  Here, when the user turns on the switch of the control panel 26, the driving motor 24 of the circulation pump 17 starts rotating and the circulation pump 17 rotates. This circulation pump 17 is a small centrifugal pump, and the principle that water that has entered each chamber in the pump is continuously discharged in the centrifugal direction by the centrifugal force generated by the rotation of the pump. .

  When the circulation pump 17 starts rotating, the liquid 27b is sucked into the circulation pump 17 through the suction pipe 14 from the suction port 13 of the bathtub 12a. At this time, air 27a is mixed into the pipe in the middle of the suction pipe 14. An air suction part 15 is arranged on the front side. The air suction part 15 has an ejector mechanism, and when water (liquid 27b) passes through the ejector center at a high speed, the air pressure in the direction perpendicular to the water flow is drawn into a negative pressure. No special power is required. The circulation pump 17 has a structure that sucks 3% as the minimum necessary air because air is locked and air does not flow if extreme air is sucked during operation (flow rate ratio 5%).

  The air suction unit 15 is connected to the air adjustment unit 23 by a connecting pipe 16, and the air adjustment unit 23 includes a check valve 23a, a throttle valve 23b, and a filter 23c in order from the air suction unit 15 side. Therefore, the check valve 23a does not cause the liquid 27b to flow backward from the connecting pipe 16 and flow out to the atmosphere side. Further, clean air is sucked in by the effect of the filter 23c having a desired mesh in the filter 23c, and a desired set amount of air is sucked by adjusting the degree of vacuum generated by the flow velocity in the ejector by the throttle valve 23b. The Since the required mixing ratio of the air 27a to the required flow rate of the liquid 27b to be used is preset in advance, it is not necessary for the user to change the setting of the throttle valve 23b.

Then, the circulation pump 17 causes the gas-liquid mixed fluid 29a in which the liquid 27b and the air 27a are mixed to pass through the discharge pipe 18 from the spray nozzle 19 of the gas-liquid dissolution tank 1 to the primary tank 3 in the gas-liquid dissolution tank 1 at high speed. Erupt. The generated gas-liquid dissolution fluid 29b is communicated from the discharge port 9 of the secondary side tank 5 of the gas-liquid dissolution tank 1 through the discharge pipe 18 to the discharge port 22 of the bathtub 12a through the discharge valve 21. At this time, since the gas-liquid dissolving fluid 29b pressurizes and dissolves air, when the gas passes through the discharge valve 21, the internal pressure is released, and the dissolved air rapidly expands so that the liquid 27b in the bathtub 12a is finely expanded. Bubble water 28 can be generated.
The gas-liquid dissolution tank 1 is divided into a primary tank (bubbling tank) 3 and a secondary tank (water level detection tank) 5 by a partition wall 6, and the primary tank 3 and the secondary tank 5 are located above the partition wall 6. The gas circulation part and the bubble passage part below the partition wall 6 communicate with each other. The spray nozzle 19 is arranged at the upper part of the primary tank 3, and an air vent valve 20 is provided on the side wall of the secondary tank via the branch part 4.
And the discharge part 10 is formed below the bubble passage part of the partition wall lower part.

  The spray nozzle 19 in the primary side tank 3 is a fan type spray nozzle having a low pressure loss and a strong spray hitting force. The air vent valve 20 of the secondary side tank 5 automatically discharges air and a gas-liquid dissolution tank. It has the role of a water level detection tank that can detect the water level in 1.

  Therefore, since the liquid level in the primary side tank is kept constant by integrally providing the secondary side tank to keep the liquid level of the liquid level of the primary side tank constant, the gas in the gas-liquid dissolution tank The amount can be kept substantially constant, and the amount of dissolved gas is stabilized, so that stable bubbles can be obtained.

<Operation of microbubble generator>
The operation of the discharge valve 21 for generating fine bubbles provided in the fine bubble generating apparatus 70 will be described.

  The change in the cross-sectional area during the movement of the liquid from position B to position C (position where the U-shaped groove 41 and the concave groove 46 face each other) increases from πxL2xS to πxL3xS. Is reduced to (πxL2xS) / (πxL3xS) = L2 / L3.

Therefore, since the liquid is rapidly depressurized while flowing from position B to position C, the depressurization valve effect (including cavitation) starts depressurization boiling in the gas in the liquid, and fine bubbles are generated.

  At this time, since the flow spreads radially from the position B to the position C, the distance between the generated adjacent fine bubbles increases. And even if the microbubbles grow gradually while moving from the position B to the position C, the flow velocity is sufficiently faster than the size and speed of the growing microbubbles, and the adjacent microbubbles do not merge. No large bubbles are generated.

  Here, vortices are generated in the U-shaped groove 41 and the concave groove 46. First, the action of the vortex will be described with reference to FIGS. 5 (a), (b), and (c). The generation of vortices and their effects and actions have been confirmed by experiments.

  As shown in FIG. 5A, when the inflow direction T1 (width W2) and the outflow direction T2 (width W3) of the gas-liquid mixed fluid are arranged in a straight line, in the vortex generation region 48 (diameter W1) Two symmetrical vortices T3 are generated on both sides of the gas-liquid mixed fluid that travels straight. Here, the relationship is W1> (W2, W3).

    Here, since there is a gas-liquid mixed fluid that goes straight from T1 to T2 without becoming the vortex T3, the ratio of the gas-liquid mixed fluid flowing into the vortex is small.

  As shown in FIG. 5 (b), when the inflow direction T1 and the outflow direction T2 are not in a straight line, the direction of the gas-liquid mixed fluid that has flowed into the vortex generating region 48 is inevitably changed, so the gas-liquid mixture that flows in All of the fluid becomes vortex T3.

  Here, the width W1 corresponding to the vortex surface of the vortex generation region is provided wider than the widths W2 and W3 of the gas-liquid mixed fluid inlet R1 and outlet R2, and the inlet R1, outlet R2, and vortex are provided. If the height (the depth direction in the drawing) of the generation region 48 is substantially the same, when the gas-liquid mixed fluid is discharged from the inflow port R1 to the vortex generation region 48, the fluid is transferred from a narrow place to a wide place. Bubbles are generated inside. At this time, since the flow velocity is lower in the central portion of the vortex than the outer peripheral portion of the vortex, the pressure is reduced and large bubbles accumulate in the central portion of the vortex.

 In addition, since shear force acts on the vortex due to the velocity gradient generated in the radial direction of the vortex, when a large bubble at the center of the vortex moves to the outer periphery of the vortex by centrifugal force, it is divided by the vortex shear force It turns into a small bubble.

 And although the central part of the vortex is stagnant, the outer periphery of the vortex is preferentially discharged by the centrifugal force caused by the rotation of the vortex, so that small bubbles of a certain size or less are continuously discharged from the outer periphery of the vortex. be able to.

  As described above, the gas-liquid mixed fluid that passes through the vortex generation region 48 in a straight line cannot sufficiently obtain the effect of the vortex, but the inflow direction R1 and the outflow direction R2 of the gas-liquid mixed fluid are not aligned. When arranged, 100% of vortices can be generated, which is effective for generating fine bubbles.

  In FIG. 5C, the inflow direction T1 and the outflow direction T2 of the gas-liquid mixed fluid are perpendicular to each other. Here, when one end J of the inflow port R1 extends and the wall H exists, the flow velocity decreases due to the frictional resistance for the inflowing gas-liquid mixed fluid to flow along the wall H. The effect of decreases. Therefore, it is preferable that there is no wall H.

  When there is no wall H, a sub-vortex generation region is formed as a partial region of the vortex generation region 48 that extends from one end J of the inflow port R1 in the direction opposite to the outflow direction R2. And since there is no wall H, the initial velocity of the vortex at the inlet R1 can be maintained, so that the effect of the vortex in the main vortex generation region which is the main region of the vortex generation region 48 is further improved.

 FIG. 6 shows a vortex state in the first embodiment of the present invention.

 As shown in FIG. 6, a vortex generating region 48 including a U-shaped groove 41 as a sub vortex generating region and a concave groove 46 as a main vortex generating region is provided in an annular shape around the central axis continuously from position C. A vortex T3 is generated in the concave groove 46 as indicated by an arrow. As described above, since the central portion of the vortex T3 has a lower flow velocity than the outer peripheral portion of the vortex and the pressure is low, the “large bubble 71” accumulates at the center of the vortex T3. When it moves to the outer periphery of the vortex T3 by force, it is divided by the shearing force of the vortex T3 to become “small bubbles (fine bubbles) 72” and flows in the direction indicated by the arrow T4.

 And since the outer peripheral part of a vortex is discharged preferentially by the centrifugal force by rotation of the vortex T3, the "small bubble 72" below a fixed magnitude | size can be discharged from the outer peripheral part of the vortex T3.

 Here, a vortex T5 indicated by an arrow is also generated in the U-shaped groove 41, but this vortex T5 merges with the vortex T3 with a time delay.

 As described above, the concave groove 46 is formed in an annular shape around the central axis, and eight discharge holes 47 are provided in an annular shape on the bottom surface of the concave groove 46. For this reason, since the vortex generated in the concave groove 46 stays in the concave groove 46 for a short time and then is discharged from the discharge hole 47, the staying vortex is energized by the continuously flowing gas-liquid dissolving fluid. Therefore, since it flows into the discharge hole 47 without decelerating, the “small bubble 72” having a certain size or less can be discharged from the outer periphery of the vortex more stably.

 Further, since the U-shaped groove 41 having a curve is provided immediately after the position C, the turbulent flow in the U-shaped groove 41 can be reduced, so that an abnormal noise is generated when the gas-liquid mixed fluid is discharged at the position C. The effect of disappearing is obtained.

  The discharge valve 21 has a simple structure with a low cost. The discharge valve 21 can be easily taken out simply by removing the cover 36, and the entire discharge mouthpiece 30 can be disassembled. Therefore, the inside can be easily cleaned and maintenance is easy. It is.

<Second Embodiment of the Present Invention>
Below, the 2nd Embodiment of this invention is described based on figures.

  As shown in FIG. 7, the discharge side nozzle portion 33 is provided with a concave groove 46, but the supply side nozzle portion 32 is not provided with a concave groove. According to this configuration, since the flow spreads radially from the position B to the position C, it is possible to prevent the adjacent fine bubbles from being combined into a large bubble as described above.

<Third Embodiment of the Present Invention>
Below, the 3rd Embodiment of this invention is described based on figures.

  As shown in FIG. 8, the corners on the A side of the concave grooves (46, 50) of the discharge side nozzle portion 33 and the supply side nozzle portion 32 facing each other are each cut into a tapered shape 51. According to this configuration, it is possible to prevent adjacent fine bubbles from being combined into a large bubble, and since the fine bubble water spreads and flows in a tapered shape, there is little pressure loss and the generation of abnormal noise can be prevented. Also, the load on the circulation pump is reduced.

<Fourth Embodiment of the Present Invention>
Below, the 4th Embodiment of this invention is described based on figures.

  As shown in FIG. 9, both corners 52a of the concave groove 52 of the supply-side nozzle portion 32 are each formed with a curve. In this configuration, it is possible to prevent adjacent fine bubbles from being combined into a large bubble. Moreover, since the inside of the concave groove 52 is changed to a laminar vortex, it is possible to prevent the generation of abnormal noise called so-called whistling.

<Fifth Embodiment of the Present Invention>
Below, the 5th Embodiment of this invention is described based on figures.

 As shown in FIG. 10, an annular slit 47a is formed at the bottom 46a of the concave groove 46, and the sectional area of the annular slit 47a is the same as the total sectional area of the eight positions described with reference to FIG. It is formed to become. In this configuration, since the discharge is preferentially performed from the outer periphery of the vortex, small bubbles having a certain size or less can be stably discharged.

<Sixth Embodiment of the Present Invention>
Below, the 6th Embodiment of this invention is described based on figures.

  As shown in FIG. 11, two sets of L-shaped concave vertical grooves 53 and horizontal grooves 54 are formed on the outer periphery of the supply-side nozzle main body 32 a of the supply-side nozzle section 32, and the discharge-side nozzle main body 33 a of the discharge-side nozzle section 33 is formed. Two sets of projections 55 are provided on the inner peripheral wall of the center turning portion 33c. Then, when the supply-side nozzle body 32a is assembled into the inner peripheral wall of the center turning portion 33c, the protrusion 55 is inserted from the vertical groove 53 and then rotated rightward to engage with the horizontal groove 54. At this time, a convex portion (not shown) is disposed at the inner corner of the lateral groove 54, and the protrusion 55 is engaged and fixed to the convex portion.

  In addition, when the discharge side nozzle main body 33a is engaged and fixed to the supply side nozzle main body 32a by the above rotation operation, the rib 56 is provided on the discharge side nozzle main body 33a side so that the concave end portion 53a of the vertical groove 53 is not exposed. Is formed so that the recess end 53a can be closed.

  With the discharge valve 21 having this configuration, the removal can be easily performed with one touch, and the maintenance can be easily performed.

  Further, since the concave end portion 53a of the vertical groove 53 is not exposed, the concave end portion 53a does not become an internal resistance during the operation of fine bubbles, so that no whistling noise is generated.

  It should be noted that all of the above-described embodiments are examples of the present invention, and the present invention should not be limited to these.

  Instead of providing eight tapered discharge holes 47 on the circumference from the bottom surface of the concave groove 46 (depth L7) of the discharge side nozzle portion 33 to one end of the discharge side nozzle portion 33, the internal resistance does not increase. A straight hole of a degree may be used. Furthermore, instead of the eight holes provided on the circumference, four sets of substantially long circular holes having two holes combined may be arranged at equal intervals.

  The dimension settings of the position A, the position B, and the position C regarding the supply side nozzle portion and the discharge side nozzle portion are appropriately determined based on the situation.

FIG. 2 is a cross-sectional view of a discharge valve in the first embodiment of the present invention. FIG. 2A is a side cross-sectional view of the supply side nozzle portion of the discharge valve according to the first embodiment of the present invention, and FIG. It is a discharge side nozzle part of a discharge valve in a 1st embodiment of the present invention, (a) is a side sectional view and (b) is a BB sectional view of (a). It is a systematic diagram of the bubble generator in the 1st Embodiment of this invention. It is explanatory drawing of the vortex of the vortex generating area | region of a discharge valve, (a) is the case where the inflow direction and the outflow direction are in a straight line, (b) is the case where the inflow direction and the outflow direction are not in a straight line, (c) is an inflow This is the case where the direction and the outflow direction are at right angles. It is explanatory drawing of the vortex of the vortex generating area | region in the 1st Embodiment of this invention. FIG. 5 is a cross-sectional view of a discharge valve in a second embodiment of the present invention. It is sectional drawing of the discharge valve in the 3rd Embodiment of this invention. It is sectional drawing of the discharge valve in the 4th Embodiment of this invention. It is sectional drawing of the discharge side nozzle part of the discharge valve in the 5th Embodiment of this invention. It is an assembly perspective view of a supply side nozzle part and a discharge side nozzle part of a discharge valve in a 6th embodiment of the present invention.

Explanation of symbols

12 Bathtub body 12a Liquid tank (bathtub)
18 Discharge pipe 21 Discharge valve 22 Discharge port 30 Discharge port metal 31 Discharge port 90 degree elbow 31a Female screw 32 Supply side nozzle part 32a Supply side nozzle body 32b Depressurization opening 32c Opening peripheral surface 33 Discharge side nozzle part 33a Discharge side nozzle body 33b Pressure release surface 34 Nozzle cover 34a Tip 34b Opening 34c Female screw 35 Z-shaped sleeve 35a Male screw 35b Flange inner surface 35c Male screw 36 Cover 36a Female screw 36b Other end 36c Opening 37 Rubber ring 38 O-ring 39 Taper hole 41 U-shaped Groove 43 鍔 44 Female screw 45 Middle wound portion 45a Female screw 46 Concave groove 47 Discharge hole 48 Vortex generation region 70 Fine bubble generator

Claims (13)

  A fine bubble generating apparatus having a discharge valve that generates a fine bubble by decompressing a gas-liquid mixed fluid, wherein the discharge valve is provided with a vortex generating region for generating a vortex in the fluid after the pressure reduction Bubble generator.   2. The fine bubble generating apparatus according to claim 1, wherein the gas-liquid mixed fluid is a gas-liquid dissolving fluid.   The fine bubble generating device according to claim 1 or 2, wherein the vortex generating region includes an inflow port and an outflow port, and an inflow direction and an outflow direction of the gas-liquid mixed fluid communicating with the inflow port and the outflow port. A microbubble generator characterized in that the direction is not linear, and the width corresponding to the vortex surface of the vortex generation region is wider than the widths of the inlet and outlet of the gas-liquid mixed fluid. The fine bubble generating device according to claim 3, wherein an inflow direction and an outflow direction of the gas-liquid mixed fluid communicating with the inflow port and the outflow port of the vortex generation region are substantially perpendicular,
The vortex generation region includes a main vortex generation region including an extension region of the inflow port and extending in the outflow direction, and a sub vortex generation region extending in the direction opposite to the outflow direction from an end opposite to the outflow port of the inflow port. A microbubble generator characterized by comprising:   5. The fine bubble generating device according to claim 1, wherein the vortex generating region is provided in an annular shape. 6.   6. The fine bubble generating device according to claim 4 or 5, wherein a corner portion of the inlet of the annular vortex generating region is cut off.   The fine bubble generating device according to claim 5 or 6, wherein the outlet communicating with the vortex generating region is an annular slit.   The fine bubble generator according to claim 5 or 6, wherein the outlets communicating with the vortex generating region are a plurality of outlets arranged in an annular shape. It is a microbubble generator of any one of Claim 1 thru | or 8, Comprising:
The fine bubble generator is configured to release the pressure of the gas-liquid mixed fluid in which the liquid in the liquid tank is circulated and the gas is pressurized and dissolved in the liquid, and discharge the liquid into the liquid tank, thereby generating the fine bubbles. With a valve,
The discharge valve is formed by a supply-side nozzle portion from which the gas-liquid dissolved fluid is discharged and a discharge-side nozzle portion that discharges fine bubble water containing the generated fine bubbles into the liquid tank,
The supply-side nozzle portion is provided in a substantially cylindrical supply-side nozzle main body, and a decompression opening that is provided at the center of one surface side of the nozzle main body and discharges the gas-liquid dissolved fluid that is dissolved under pressure and releases the pressure. And an opening peripheral surface provided on the opening peripheral edge of the decompression opening,
The discharge nozzle portion is a substantially cylindrical discharge-side nozzle main body, and a pressure release surface provided in the discharge-side nozzle main body so as to face the pressure-reducing opening and through the opening peripheral surface and a predetermined gap. And a concave groove (the vortex generation region) disposed around the pressure release surface,
A discharge hole (the outlet) through which the fine bubbles formed between the peripheral edge surface of the opening and the pressure release surface (the inlet) are discharged into the liquid tank is a concave groove (the above-mentioned outlet). A microbubble generator characterized by being formed at the bottom of a vortex generating region). The fine bubble generator according to claim 9,
A fine bubble generating device, wherein a concave groove (the sub vortex generating region) is formed around a decompression opening of the supply side nozzle portion at a position facing the concave groove of the discharge side nozzle portion. The fine bubble generating device according to claim 9 or 10,
The concave-shaped groove | channel where the said discharge side nozzle part and the said supply side nozzle part oppose is each formed with the U-shaped curve inner wall, The microbubble generator characterized by the above-mentioned. A microbubble generator according to claim 9 or claim 11,
An L-shaped groove is formed on the outer periphery of the supply-side nozzle body, and the supply-side nozzle body is inserted into the inner peripheral wall of the discharge-side nozzle body on the inner side of the discharge-side nozzle body. A fine bubble generator characterized by providing convex portions to be joined.   The discharge valve used for the microbubble generator of any one of Claim 1 thru | or 12.

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