JP6887757B2 - Nozzle and fine bubble generator - Google Patents

Description

The present invention relates to a fine bubble generator provided with a nozzle for generating fine bubbles in a gas-liquid dissolved liquid and discharging the generated fine bubbles to the outside.

The pressurization / depressurization method is known as a method for generating fine bubbles (microbubbles, nanobubbles, etc.). In this pressurized and depressurized method, a gas is pressure-dissolved in a liquid under high pressure to generate a gas-liquid dissolved liquid, and the gas-liquid-dissolved liquid that has been pressure-dissolved is boiled under reduced pressure to rebubble the liquid. Generates fine bubbles in the dissolved liquid.

As a device using this pressurization / depressurization method, after a gas is pressurized and dissolved in a liquid in a dissolution tank, it is boiled under reduced pressure with a nozzle to generate fine bubbles in an external liquid tank (such as a bathtub). A fine bubble generator that ejects fine bubbles into a liquid is known (for example, Patent Document 1).

The purpose of the fine bubble generator of Patent Document 1 is to stabilize the generation of fine bubbles for a long period of time while generating fine bubbles by the decompression mechanism of the nozzle. In particular, the nozzle is provided with a rectifying path (in Patent Document 1, a flow control space) for adjusting the flow of the gas-liquid dissolved liquid containing fine bubbles on the downstream side of the generation portion for generating fine bubbles. ing. By providing the rectifying path, the flow of fine bubbles in the gas-liquid molten liquid flowing through the rectifying path can be adjusted in one direction, and as a result, the fine bubbles in the gas-liquid dissolved liquid generated at the generating part are combined. This prevents the bubbles from increasing in diameter. Further, by setting the length of this rectifying path (rectifying path length) to be long, it becomes easy to arrange the flow of fine bubbles in one direction, and the fine bubbles are sent to the outside in a state where the flow of fine bubbles is stabilized in one direction. It can be discharged.

Japanese Unexamined Patent Publication No. 2009-82841

By the way, at present, in the fine bubble generator installed in a bathtub or the like, the device is being made more compact. In particular, the nozzles that are directly attached to the bathtub are being made more compact.

On the other hand, as described above, for example, in the nozzle as shown in Patent Document 1, a rectifying path for adjusting the flow of fine bubbles is provided in order to prevent the diameter from being increased due to the coupling of fine bubbles. , The nozzle (especially the nozzle length, which is the depth dimension of the nozzle) becomes long, and it is difficult to make the nozzle compact. On the other hand, if the rectifying path is eliminated or the rectifying path length is set short in order to make the nozzle compact, the flow of fine bubbles becomes poor, leading to an increase in the diameter of the bubbles.

Therefore, in order to solve the above problems, it is an object of the present invention to provide a nozzle and a fine bubble generator that regulate the flow of fine bubbles to prevent the diameter of the fine bubbles from increasing even if the nozzle length is short. ..

In order to achieve the above object, the nozzle according to the present invention generates fine bubbles in the gas-liquid dissolved liquid, and the nozzle that discharges the generated fine bubbles to the outside generates fine bubbles in the gas-liquid dissolved liquid. A generating unit, a rectifying unit arranged on the downstream side of the generating unit to regulate the flow of fine bubbles, and a discharging unit arranged on the downstream side of the rectifying unit to discharge fine bubbles to the outside are provided. The rectifying section is characterized in that the length of the rectifying path through which fine bubbles flow (rectifying path length) is longer than the total length of the rectifying section. Further, in order to achieve the above object, the fine bubble generator according to the present invention for generating fine bubbles is characterized in that the nozzle according to the present invention is provided.

According to the present invention, in the rectifying unit, the length of the rectifying path is longer than the total length of the rectifying unit, so that the flow of the fine bubbles is adjusted so as to prevent the fine bubbles from being bonded to each other, while the rectifying unit is used. The total length of the can be shortened. As described above, according to the present invention, since the total length of the rectifying unit can be shortened, the nozzle length (nozzle depth) can be shortened, and the nozzle can be made compact. That is, according to the present invention, the long rectifying path length can be secured even if the nozzle length is shortened, and as a result, even if the nozzle length is short and compact, the flow of fine bubbles is adjusted and the fine bubbles are arranged. It is possible to prevent the increase in diameter.

In the above configuration, the rectifying unit may be provided with a changing wall which is arranged at an angle with respect to the flow direction of the fine bubbles coming from the upstream and changes the flow direction of the fine bubbles.

In this case, since the changing wall is provided, the flow direction of the fine bubbles can be changed, and as a result, the rectifying path can be bent and formed. Therefore, the length of the rectifying path can be made longer than that of the conventional rectifying path in which the rectifying path is limited to only one direction of a straight line.

In the above configuration, the rectifying unit is provided with a rectifying plate for rectifying fine bubbles, and both sides (one side and the other side) of the rectifying plate are used as wall surfaces of the rectifying path, and the rectifying plate is along both sides. The flow direction of the fine bubbles may be opposite.

In this case, since the straightening vane is provided in the straightening vane, the fine bubbles flowing along one surface of the straightening vane are changed in the flow direction of the fine bubbles by the changing wall, and then the other surface of the straightening vane is changed. Fine bubbles can flow along the. That is, the changing wall and the rectifying plate can make the rectifying path a folded path, which contributes to lengthening the rectifying path length.

As described above, according to the nozzle and the fine bubble generator of the present invention, it is possible to improve the flow of fine bubbles and prevent the diameter of the fine bubbles from increasing even if the nozzle length is short.

It is a schematic block diagram of the fine bubble generator which concerns on Embodiment 1 of this invention. FIG. 5 is a schematic plan view of the nozzle according to the first embodiment of the present invention as viewed from the exposed surface side of the first nozzle component. It is schematic cross-sectional view which showed the structure of the nozzle which concerns on Embodiment 1 of this invention. It is a schematic plan view which showed only the upstream end side of the turning space part provided in the nozzle which concerns on Embodiment 1 of this invention. It is a schematic perspective view of the 3rd nozzle constituent part which concerns on Embodiment 1 of this invention. FIG. 5 is a schematic plan view of the nozzle according to the second embodiment of the present invention as viewed from the exposed surface side of the first nozzle component. It is schematic cross-sectional view which showed the structure of the nozzle which concerns on Embodiment 2 of this invention. FIG. 5 is a schematic plan view of the nozzle according to the third embodiment of the present invention as viewed from the exposed surface side of the first nozzle component. It is schematic cross-sectional view which showed the structure of the nozzle which concerns on Embodiment 3 of this invention. FIG. 5 is a schematic plan view of the nozzle according to the fourth embodiment of the present invention as viewed from the exposed surface side of the first nozzle component. It is schematic cross-sectional view which showed the structure of the nozzle which concerns on Embodiment 4 of this invention. FIG. 5 is a schematic plan view of the nozzle according to the fifth embodiment of the present invention as viewed from the exposed surface side of the first nozzle component. It is schematic cross-sectional view which showed the structure of the nozzle which concerns on Embodiment 5 of this invention. It is schematic cross-sectional view which showed the structure of the nozzle which concerns on Embodiment 6 of this invention.

Hereinafter, embodiments of the present invention (the present embodiments) will be described with reference to the drawings. In the present embodiment shown below, the case where the present invention is applied to a household bathtub as a liquid tank is shown. However, the liquid tank is not limited to the bathtub for home use, and may be a bathtub or pool for business use, a farm used for aquaculture and installed in Lake Kaikawa, or the like.

The schematic configuration of the fine bubble generator 2 of the first embodiment will be described with reference to FIG. FIG. 1 is a schematic configuration diagram showing the configuration of the fine bubble generator 2 according to the first embodiment of the present invention.

As shown in FIG. 1, a nozzle 3 for sucking / discharging the liquid (water) stored in the liquid tank 1 is attached (installed) to the tank wall 11 of the liquid tank 1. A pressure pump 23 is connected to a suction portion 31 (see FIGS. 2 and 3) of the nozzle 3 via a suction pipe 21 and a gas introduction portion 22.

The liquid sucked from the suction portion 31 of the nozzle 3 passes through the suction pipe 21 and flows to the gas introduction portion 22. The gas introduction unit 22 has a gas introduction port 24 for sucking a gas having an atmosphere such as air, and introduces the gas from the gas introduction unit 22 into the suction pipe 21. The gas introduction unit 22 has an ejector mechanism and is a naturally aspirated system that does not require special power.

A pressure pump 23 is connected to the downstream side of the gas introduction unit 22, and the gas is sucked from the gas introduction unit 22 by the pumping action of the pressure pump 23, and the sucked gas is mixed with the liquid (gas-liquid mixing). The pressurizing pump 23 and the dissolution tank 25 are connected by an inflow pipe 26 that sends a liquid in a gas-liquid mixed state (gas-liquid mixed liquid) to the dissolution tank 25. The gas-liquid mixture liquid referred to here is pressurized by the pressurizing pump 23 and is in a high pressure state.

To elaborate on the above gas-liquid mixing, in the first embodiment, when the pressurizing pump 23 is driven, the liquid in the liquid tank 1 flows from the suction unit 31 through the suction pipe 21 to the suction port of the pressurizing pump 23. Is inhaled. At that time, since the gas is sucked from the gas introduction port 24 of the gas introduction unit 22 installed in the middle of the suction pipe 21, the liquid sucked into the pressurizing pump 23 is in a gas-liquid mixed state.

In the gas-liquid mixed liquid that has flowed into the dissolution tank 25, the gas is pressure-dissolved in the liquid in the dissolution tank 25 (for example, pressure-dissolved at a gauge pressure of 0.2 MPa), and the liquid in a gas-liquid dissolved state (gas-liquid dissolution). It becomes a liquid).

A nozzle 3 is arranged on the downstream side of the dissolution tank 25, and the dissolution tank 25 and the nozzle 3 are connected by a discharge pipe 27 that sends a gas-liquid dissolution liquid to the nozzle 3. The gas-liquid dissolving liquid flowing through the nozzle 3 is boiled under reduced pressure in the nozzle 3, and fine bubbles are generated in the gas-liquid dissolving liquid. The fine bubbles generated in the nozzle 3 are discharged from the nozzle 3 to the liquid tank 1 (outside).

As described above, in the fine bubble generator 2, the nozzle 3 is connected to the gas introduction unit 22 and the pressurizing pump 23 by the suction pipe 21, the pressurizing pump 23 is connected to the melting tank 25 by the inflow pipe 26, and the melting tank 25 is connected. Is constructed by a circulation system connected to the nozzle 3 by a discharge pipe 27. Then, in this circulation system, the pressure pump 23 is used to suck the liquid in the liquid tank 1 from the nozzle 3 and suck the gas from the gas introduction port 24 to generate a gas-liquid mixed liquid to generate the gas-liquid mixed liquid. Send to the melting tank 25. In the dissolution tank 25, a gas is pressurized and dissolved in the liquid to generate a gas-liquid dissolved liquid, and the generated gas-liquid dissolved liquid is boiled under reduced pressure with a nozzle 3 to generate fine bubbles in the gas-liquid dissolved liquid. Fine bubbles are discharged from the nozzle 3 to the liquid tank 1.

Next, the nozzle 3 according to the first embodiment will be described with reference to the drawings. FIG. 3 is a schematic configuration diagram showing the configuration of the nozzle 3 in the first embodiment.

As shown in FIGS. 1 and 3, the nozzle 3 is attached (installed) to the tank wall 11 of the liquid tank 1 via a cushioning material 91 (annular packing or the like). The nozzle 3 installed in the liquid tank 1 sucks the liquid of the liquid tank 1 from the suction portion 31, sends the sucked liquid to the suction pipe mounting port 33 through the suction guide flow path 32, and sucks the liquid from the suction pipe mounting port 33. Discharge to the pipe 21. The suction pipe 21 is attached to the nozzle 3 (suction pipe attachment port 33) via the O-ring 92.

On the other hand, the liquid gas-liquid dissolved in the dissolution tank 25 (gas-liquid dissolution liquid) flows to the nozzle 3 through the discharge pipe 27 as shown in FIGS. 1 and 3. As shown in FIG. 3, the discharge pipe 27 is attached to the nozzle 3 (discharge pipe attachment port 34) via the O-ring 92. In the nozzle 3, the gas-liquid dissolution liquid guided from the discharge pipe mounting port 34 to the nozzle 3 is sent to the generation unit 35 arranged downstream of the discharge pipe attachment port 34, and the generation unit 35 puts the gas-liquid dissolution liquid into the gas-liquid dissolution liquid. Generates fine bubbles. The gas-liquid dissolution liquid containing the fine bubbles generated in the generation unit 35 is flowed to the rectifying unit 4 arranged downstream of the generation unit 35, and the flow of the fine bubbles is adjusted by the rectifying unit 4. After adjusting the flow of fine bubbles in the rectifying unit 4, the gas-liquid dissolved liquid containing the fine bubbles is sent to the discharge unit 38 arranged downstream of the rectifying unit 4, and the discharge unit 38 is finely divided into the liquid tank 1 (outside). Bubbles (specifically, a gas-liquid dissolved liquid containing fine bubbles) are discharged. The discharge direction of the fine bubbles in the discharge unit 38 and the flow direction of the fine bubbles flowing from the generation unit 35 to the rectifying unit 4 are the same direction, and the discharge unit 38 is located downstream of the rectifying path 41 and is located in the rectifying unit 4. It is continuously provided in.

The generation unit 35 is provided with a decompression swivel portion 30, a decompression guide flow path 36, and a swirl space portion 37. In the generation unit 35, the gas-liquid dissolution liquid conducted from the discharge pipe attachment port 34 is flowed through the decompression guide flow path 36 to reduce the pressure of the increased pressure gas-liquid dissolution liquid.

In the decompression guide flow path 36, a tapered flow path 361 (so-called Venturi tube shape) in which the diameter is gradually narrowed is formed, and the pressure is kept constant on the downstream side of the tapered flow path without changing the diameter. A flow path 362 is formed. In the decompression guide flow path 36, the pressure loss is suppressed when passing through the decompression guide flow path 36 by gradually changing the diameter of the tapered flow path 361. The degree of reduction of the diameter of the decompression guide flow path 36 may be set to a certain degree or more, and the decompression guide flow path 36 may also be subjected to decompression boiling to generate fine bubbles. After passing through the tapered flow path 361, the gas-liquid dissolving liquid passes through the flow path 362 to stabilize the pressure of the gas-liquid dissolving liquid. Then, the gas-liquid dissolution liquid that has passed through the decompression guide flow path 36 flows to the decompression swirl section 30 arranged downstream of the decompression guide flow path 36, and flows through the decompression swirl section 30 to reduce the pressure of the gas-liquid dissolution liquid. , Generates fine bubbles in the gas-liquid dissolved liquid. At this time, a swirling force is applied to the gas-liquid dissolved liquid by swirling at the decompression swirl unit 30. After generating fine bubbles in the gas-liquid dissolved liquid in the decompression swirl section 30, the gas-liquid dissolution liquid flows into the swirl space section 37 arranged downstream of the decompression swirl section 30, and the fine bubbles are sheared in the swirl space section 37. Therefore, the fine bubbles are further refined. After that, the gas-liquid dissolved liquid containing fine bubbles flows into the rectifying unit 4 (rectifying path 41). If the gas-liquid dissolution liquid conducted from the discharge pipe mounting port 34 is directly flowed into the swirling space 37 without providing the decompression guide flow path 36, the flow becomes messy and a desired amount of fine bubbles are generated. Difficult to get.

As shown in FIGS. 3 to 5, a conical portion 371 formed in a substantially conical shape is arranged in the swivel space portion 37. The circular central portion (circular central portion) of the conical portion 371 in a plan view serves as a connecting portion with the decompression guiding flow path 36, and the decompression swivel portion 30 is provided on the downstream side of this portion. The decompression swivel portion 30 is composed of a plurality of (three in the present embodiment) notch grooves 72 that are radiated while rotating in one direction (clockwise in the present embodiment) from the central portion of the circular shape in a plan view. .. In the decompression swirl portion 30, the circular central portion is upstream, the circular outer edge portion is downstream, and three flow paths are formed from the upstream of the central portion to the downstream of the outer edge portion along the three notch grooves 72. .. In this way, the flow path composed of these three notch grooves 72 is formed so as to swirl clockwise from the central portion of the circular shape in a plan view, and the groove width is gradually widened (or the groove width is kept constant). There is). Here, the notch grooves 72 are connected to the swirling space 37 in a swirling manner, so that the swirling direction is added to the flow direction of the gas-liquid dissolved liquid containing fine bubbles. In each notch groove 72, the outer wall 74 affected by the centrifugal force is formed, whereas in the inner wall 75, the radius is a small arc. Further, in the notch groove 72, the radius of the outer wall 74 gradually increases from the upstream to the downstream, or the radius of the inner wall 75 gradually decreases from the upstream to the downstream.

Then, in the swirling space portion 37, the gas-liquid dissolving liquid containing fine bubbles that has flowed to the circular outer edge portion flows while swirling along the outer peripheral surface of the conical shape portion 371, and is connected to the rectifying portion 4. Flow to. A plurality of guide holes 73 are formed concentrically with the conical portion 371 at intervals (six in the first embodiment).

Further, in a gas-liquid dissolved liquid containing swirling fine bubbles, a shearing force acts due to a velocity gradient generated in the radial direction of the swirling flow, so that the fine bubbles generated from the above-mentioned decompression boiling become fine bubbles due to this swirling. Is sheared to be further refined. In this way, the fine bubbles generated in the gas-liquid dissolved liquid in the generating section 35 flow to the rectifying section 4 arranged downstream of the generating section 35, and the swirling flow is attenuated or extinguished in the rectifying section 4 to cause the flow of the fine bubbles. Arrange. The rectifying unit 4 is provided to arrange the flow of the fine bubbles to prevent the fine bubbles from binding to each other (enlarge the size of the bubbles) and to impart outflow resistance to the swirling space 37. .. That is, since the rectifying unit 4 is present between the swirling space portion 37 and the discharging portion 38, the flow resistance of the gas-liquid dissolved liquid is increased as compared with the case where the swirling space portion 37 is not provided between them. Therefore, the staying time of bubbles in the swirling space 37 can be lengthened. As a result, the bubbles are further miniaturized.

As shown in FIG. 3, the rectifying unit 4 is provided with a changing wall 42 and a rectifying plate 43, and the modified wall 42 and the rectifying plate 43 form a bent rectifying path 41. The length of the rectifying path 41 (rectifying path length) is longer than the total length L of the rectifying section 4 because the rectifying path 41 is bent.

The changing wall 42 is arranged at an angle (for example, 90 °) with respect to the flow direction of the fine bubbles coming from the upstream in the space of the rectifying path 41, and by providing the changing wall 42 in the rectifying unit 4, the fine bubbles Change the flow direction of. Since the flow direction of the fine bubbles is changed by providing the changing wall 42, a plurality of fine bubble flow directions can be created in the space of the rectifying path 41. In the first embodiment, the changing wall 42 is arranged so as to be perpendicular to the discharge direction of the fine bubbles in the discharge unit 38 and the flow direction of the fine bubbles flowing from the generation unit 35 to the rectifying unit 4.

By the way, in the rectifying unit 4, there is a possibility that collisions between fine bubbles may occur due to the existence of a plurality of flow directions of the fine bubbles. Therefore, in order to prevent the collision between the fine bubbles, further adjust the flow of the fine bubbles in one direction, and stabilize the flow of the fine bubbles, a cylindrical rectifying plate 43 is provided in the rectifying unit 4 in the flow direction of the fine bubbles. Arranged along. In the straightening vane 43, both sides (one side 44, the other side 45) are the wall surfaces of the straightening path 41. By providing the straightening vane 43 in the straightening vane 4, fine bubbles flow along both sides 44 and 45 of the straightening vane 43. In the first embodiment, the flow directions of the fine bubbles flowing along the both sides 44 and 45 of the straightening vane 43 are opposite to each other. Specifically, the flow direction of the fine bubbles flowing along one surface 44 of the rectifying plate 43 is the flow direction of the fine bubbles flowing from the generating unit 35 to the rectifying unit 4. On the other hand, the flow direction of the fine bubbles flowing along the other surface 45 of the straightening vane 43 is opposite to the flowing direction of the fine bubbles flowing from the generating section 35 to the straightening section 4. By providing the rectifying plate 43 in the rectifying unit 4, it is possible to prevent collisions between fine bubbles and further regulate the flow of fine bubbles to stabilize the flow.

As described above, in the first embodiment, by providing the changing wall 42 and the rectifying plate 43 in the rectifying unit 4, the rectifying path length can be lengthened with respect to the total length L of the rectifying unit 4. Specifically, the fine bubbles flowing through the rectifying path 41 according to the first embodiment flow along one surface 44 of the rectifying plate 43. Then, the fine bubbles flowing along one surface 44 of the straightening vane 43 change the flow direction of the fine bubbles by the changing wall 42. After that, the fine bubbles whose flow direction is changed flow along the other surface 45 of the straightening vane 43. In this way, the changing wall 42 and the rectifying plate 43 can make the rectifying path 41 a folded path, and as a result, the rectifying path length becomes long. Therefore, the length of the rectifying path in the rectifying unit 4 can be increased with respect to the total length of the rectifying unit 4, while contributing to the short length of the nozzle.

As shown in FIGS. 2 and 3, the discharge unit 38 is provided with a discharge hole 53, and the discharge hole 53 is continuously provided in the rectifying unit 4 on the downstream side of the rectifying unit 4.

Next, the structure of the nozzle 3 will be described with reference to the drawings. As shown in FIG. 3, the nozzle 3 is provided with four nozzle components: a first nozzle component 5, a second nozzle component 6, a third nozzle component 7, and a fourth nozzle component 8. The first nozzle constituent portion 5 is formed by integrally molding a suction portion 31 and a discharge portion 38 that are exposed to the liquid tank 1 and suck / discharge the liquid (water) stored in the liquid tank 1. It becomes a cover. The second nozzle component 6 fixes the nozzle 3 to the tank wall 11 from the liquid tank 1 side. The third nozzle component 7 generates fine bubbles from the gas-liquid dissolved liquid, and further stabilizes the generation of the fine bubbles. The fourth nozzle component 8 fixes the nozzle 3 to the tank wall 11 from the outer surface of the liquid tank 1, and attaches the suction pipe 21 and the discharge pipe 27 to the nozzle 3.

The first nozzle component 5 is a cup member (cover member) having a circular shape in a plan view arranged in the liquid tank 1, and the outer peripheral wall 52 is formed so as to rise from the outer peripheral edge of the exposed surface 51 for discharging / sucking the liquid. There is.

On the exposed surface 51, as shown in FIGS. 2 and 3, in a plan view, a discharge portion 38 for discharging fine bubbles into the liquid tank 1 is arranged in the center, and the discharge portion 38 is arranged outside the plane view (along the outer edge). ) A suction unit 31 for sucking the liquid in the liquid tank 1 is arranged.

The discharge portion 38 is arranged in the central portion of the exposed surface 51, and a circular changing wall 42 (see above) is arranged in the center thereof, and six changing walls 42 are arranged outside the plane view (along the outer edge). Fan-shaped discharge holes 53 are formed so as to be arranged at equal intervals. In the first embodiment, the discharge portion 38 is provided with a discharge hole 53 and a changing wall 42.

The suction portion 31 is formed by forming 16 suction holes 54 (along the outer edge) of the discharge portion 38 outside the plan view at equal intervals. All the suction holes 54 are formed by integrally forming a notch groove 56 in the through hole 55, and the notch groove 56 starts at the through hole 55 and is located at the center of the exposed surface 51 shown in FIG. On the other hand, it has a shape that extends radially. By forming the notch groove 56, it is possible to induce the suction of the liquid from a wide range, and it is possible to increase the suction amount from the suction portion 31.

In the first nozzle component 5, as shown in FIG. 3, a part of the free end 57 of the outer peripheral wall 52 is bent and formed, and the bent free end 57 is formed on the peripheral wall of the second nozzle component 6. The structure is such that it is engaged with the flange 61.

Further, as shown in FIG. 3, inside the exposed surface 51, the first nozzle constituent portion 5 is configured with a third nozzle in the same direction as the protruding direction of the outer peripheral wall 52 from the position between the discharge portion 38 and the suction portion 31. Engagement pieces 58 for engaging with the portion 7 and the fourth nozzle constituent portion 8 are projected, and these engaging pieces 58 are a part of the outer circumference of the rectifying path 41 or one of the inner circumferences of the suction guide flow path 32. Become a department.

As shown in FIG. 3, the second nozzle component 6 fixes the nozzle 3 from the liquid tank 1 side to the tank wall 11 via a cushioning material 91 (annular packing or the like). The second nozzle component 6 is a ring-shaped member having a hollow shape, and the flange 61 engages the free end 57 of the outer peripheral wall 52 of the first nozzle component 5 with a part of the peripheral wall serving as the outer peripheral edge of the ring. Is molded. Further, the inner peripheral wall 62 is formed so as to rise from the inner peripheral edge of the ring, and the inner peripheral wall 62 becomes the outer periphery of the suction guide flow path 32. Further, a holding portion 63 for attaching to the liquid tank 1 is provided on the outer peripheral side of the surface on which the inner peripheral wall 62 is raised and molded, and the holding portion 63 of the second nozzle constituent portion 6 and the sandwiching portion 8 of the fourth nozzle constituent portion 8 are sandwiched. The nozzle 3 is sandwiched and installed on the tank wall 11 of the liquid tank 1 via the cushioning material 91 (annular packing or the like) by the portion 81 (see below).

As shown in FIG. 3, the third nozzle component 7 generates fine bubbles from the gas-liquid dissolved liquid, and further stabilizes the generation of the fine bubbles, and the conical portion 371 fitted in the cylindrical space and the conical portion 371. A cylindrical protrusion 71 formed concentrically protruding toward the tip of the conical portion 371, a cylindrical rectifying plate 43 arranged concentrically with the protrusion 71, a swirling space portion 37, and a rectifying portion 4 The partition wall that separates the partition wall, the flow guide hole 73 formed in the partition wall, and the male screw formed on the outer peripheral portion of the partition wall are integrally formed. The male screw is screwed into and fixed to the female screw formed in the fourth nozzle component 8 (female screw).

In the first embodiment, the tip of the protrusion 71 is in contact with the changing wall 42 of the first nozzle constituent portion 5, and the length of the protrusion 71 corresponds to the total length L of the rectifying portion 4. However, the tip of the protrusion 71 may be slightly separated from the change wall 42, and in this case, the total length L corresponds to the distance from the base end portion of the protrusion 71 to the change wall 42.

Further, in the rectifying unit 4, the rectifying plate 43 projects outward along the same projection direction as the projection piece 71 while maintaining a constant distance from the projection piece 71. Further, a flow guide hole 73 is formed between the base end portion of the protrusion piece 71 and the base end portion of the straightening vane 43. By providing the rectifying plate 43 and the changing wall 42 in the rectifying unit 4, the length of the rectifying path 41 through which fine bubbles flow in the space of the rectifying unit 4 becomes longer than the total length of the rectifying unit 4.

As shown in FIG. 3, the fourth nozzle component 8 fixes the nozzle 3 to the tank wall 11 from the outer surface of the liquid tank 1, and attaches the suction pipe 21 and the discharge pipe 27 to the nozzle 3. In the fourth nozzle component 8, a decompression guide flow path 36 is provided in the central portion, and a suction guide flow path 32 is provided around the decompression guide flow path 36.

A suction pipe attachment port 33 for attaching the suction pipe 21 is provided at the downstream end of the suction guide flow path 32, and the liquid sucked from all the suction portions 31 flows to the suction pipe 21 via the suction guide flow path 32. A suction pipe 21 is sealed and fitted to the suction pipe attachment port 33 with an O-ring 92.

Further, a holding portion 81 for attaching to the liquid tank is provided on the outer periphery of the downstream end of the suction guide flow path 32, and the holding portion 81 (see above) of the second nozzle constituent portion 6 and the fourth nozzle constituent portion 8 are provided. The nozzle 3 is sandwiched and installed on the tank wall 11 of the liquid tank 1 via the cushioning material 91 (annular packing or the like) by the sandwiching portion 81.

Further, a discharge pipe attachment port 34 for attaching the discharge pipe 27 is provided at the upstream end of the decompression guide flow path 36, and the gas-liquid dissolved liquid flowing from the discharge pipe 27 is discharged to the generating unit 35 (the decompression guide flow path 36 and the swirl). Send to space 37). A discharge pipe 27 is sealed and fitted to the discharge pipe attachment port 34 with an O-ring 92. The suction pipe mounting port 33 and the discharge pipe mounting port 34 have the same diameter, making it easy to attach the general-purpose suction pipe 21 and the discharge pipe 27.

The fourth nozzle component 8 is used on the entire circumference (outer circumference and inner circumference) of the suction guide flow path 32 and on the outer circumference of the swirl space portion 37. Further, a female screw (not shown) for screwing into a spiral groove formed on the outer peripheral wall of the cylindrical body of the third nozzle constituent portion 7 is formed on the downstream side of the swirling space portion 37.

According to the first embodiment, in the rectifying unit 4, since the rectifying path length is longer than the total length L of the rectifying unit 4, the flow of the fine bubbles is adjusted so as to prevent the fine bubbles from being bonded to each other. The total length of the rectifying unit 4 can be shortened. As described above, according to the first embodiment, since the total length of the rectifying unit 4 can be shortened, the nozzle length (nozzle depth) can be shortened, and the nozzle 3 can be made compact. .. That is, according to the first embodiment, a long rectifying path length can be secured even with a short nozzle length, and as a result, even with a nozzle 3 having a short nozzle length and a compact size, the flow of fine bubbles flows in one direction. It is possible to prevent the diameter of the fine bubbles from increasing by adjusting the size (improving the flow of the fine bubbles).

Further, according to the first embodiment, since the changing wall 42 is provided, the flow direction of the fine bubbles can be changed, and as a result, the rectifying path 41 can be bent and formed. Therefore, the length of the rectifying path can be made longer than that of the conventional rectifying path in which the rectifying path is limited to only one direction of a straight line.

Further, according to the first embodiment, since the straightening vane 43 and the changing wall 42 are provided in the straightening vane 4, the fine air bubbles flowing along one surface 44 of the straightening vane 43 are separated by the changing wall 42. The flow direction can be changed, and then fine bubbles can flow along the other surface 45 of the straightening vane 43. That is, according to the first embodiment, the changing wall 42 and the rectifying plate 43 can make the rectifying path 41 a folded path, which contributes to lengthening the rectifying path length. Further, even in the rectifying path 41 which is bent by the changing wall 42, the rectifying plate 42 can rectify the fine bubbles.

In the first embodiment, the shape of the discharge hole 53 is fan-shaped, but the shape is not limited to this, and any shape may be used.

Further, in the first embodiment, the changing wall 42 is provided in the first nozzle constituent portion 5, but the present invention is not limited to this, and the flow direction of fine bubbles coming from the upstream in the space of the rectifying path 41 is not limited to this. If it is arranged at an angle with respect to the water and changes the flow direction of the fine bubbles, the change wall 42 is formed only in the third nozzle constituent portion 7, and the change wall 42 of the third nozzle constituent portion 7 is formed. The first nozzle constituent part 5 may be arranged so as to cover it.

Further, in the first embodiment, the changing wall 42 is arranged so as to be perpendicular to the discharge direction of the fine bubbles in the discharge unit 38 and the flow direction of the fine bubbles flowing from the generation unit 35 to the rectifying unit 4. However, the present invention is not limited to this, and is not limited to vertical as long as it has an angle with respect to these discharge directions and flow directions and changes the flow direction of fine bubbles in the rectifying unit 4. May be good.

Further, in the first embodiment, a part of the free end 57 of the outer peripheral wall 52 of the first nozzle constituent portion 5 is engaged with the flange 61 formed on the peripheral wall of the second nozzle constituent portion 6. However, the shape of a part of the bent free end 57 here is not limited, and may engage with the flange 61 formed on the peripheral wall of the second nozzle component 6. If possible, any shape may be used. Similarly, the flange 61 formed on the peripheral wall of the second nozzle constituent portion 6 may have any shape as long as it can engage with the bent free end of the first nozzle constituent portion 5.

Further, in the first embodiment, the suction hole 54 has a notch groove 56 continuously integrally molded in the through hole 55, but this is a preferable example, and the suction hole 54 is not limited to this. The suction hole 54 may be formed only by the through hole 55. Further, the through hole 55 of the suction hole 54 has a circular shape in a plan view, but the shape is not limited to this, and any shape may be used. Further, the notch groove 56 of the suction hole 54 has a rectangular parallelepiped shape extending radially with respect to the center of the exposed surface 51 starting from the through hole 55, but this is a preferable example and is limited to this. For example, it may have a fan shape that extends radially from the center of the exposed surface 51 starting from the through hole 55. Alternatively, as shown in FIGS. 6 and 7, the width of the notch groove 56 may be the same as the diameter of the suction hole 54.

The nozzle 3 according to the second embodiment shown in FIGS. 6 and 7 has the same other configurations and shapes as the nozzle 3 according to the first embodiment except that the shape of the first nozzle component 5 is different. It has become. Therefore, only the configuration different from the nozzle 3 according to the first embodiment will be described below, and the description of the same configuration and the same action and effect will be omitted.

In the nozzle 3 according to the second embodiment, as shown in FIGS. 6 and 7. Compared to the nozzle 3 according to the first embodiment, the suction portion 31 of the first nozzle constituent portion 5 is projected and molded. Therefore, the length of the notch groove 56 is set short.

In the first and second embodiments described above, the outer peripheral wall 39 of the swirling space 37 is formed into a cylindrical shape (cylindrical body). However, the outer peripheral wall 39 of the swirling space portion 37 is not limited to this, and has a shape that gradually expands in a tapered shape from the upstream to the downstream as in the nozzle 3 according to the third embodiment shown in FIG. May be good. In this way, by forming the outer peripheral wall 39 of the swirling space 37 so as to gradually expand in a tapered shape from the upstream to the downstream, the resistance to the liquid in the swirling space 37 is reduced, and the swirling flow is more likely to occur, which is fine. Bubbles are efficiently miniaturized.

Further, in the above-described first to third embodiments, the straightening vane 43 is provided in the space of the straightening path 41, which is a preferable example. However, in order to increase the length of the rectifying path 41 through which fine bubbles flow in the rectifying unit 4 with respect to the total length of the rectifying unit 4, for example, the nozzle 3 according to the fourth embodiment shown in FIGS. Like the nozzle 3 according to the fifth embodiment shown in 12 and 13, the flow direction of the fine bubbles flowing from the generating unit 35 (specifically, the flow guide hole 73) to the rectifying unit 4 without providing the rectifying plate 43. The discharge hole 53 may not be arranged on the extension line. According to the nozzle 3 shown in FIGS. 10 to 13, the fine bubbles hit the changing wall 42, the flow direction of the fine bubbles changes, and the fine bubbles flow into the discharge hole 53. Alternatively, the fine bubbles circulate in the space of the rectifying path 41 and flow into the discharge hole 53. Alternatively, since the fine bubbles flow diagonally from the flow guide hole 73 toward the discharge hole 53 as shown by the arrows in FIGS. 11 and 13, the rectifying unit 4 is transmitted from the generation unit 35 (specifically, the flow guide hole 73). The total length of the rectifying unit 4 can be shortened by increasing the length of the rectifying path with respect to the total length of the rectifying unit 4 with respect to the nozzle in which the discharge hole 53 is arranged on the extension line in the flow direction of the fine bubbles flowing in. As a result, the nozzle length (nozzle depth) can be shortened, and the nozzle 3 can be made compact.

Further, for example, as in the nozzle 3 according to the fifth embodiment shown in FIG. 14, the rectifying plate 43 has an L-shaped vertical cross section, and fine bubbles are flowed in a direction orthogonal to the total length direction of the rectifying unit 4. May be good. In this case as well, the fine bubbles hit the changing wall 42, the flow direction of the fine bubbles changes, and the fine bubbles flow into the discharge hole 53. The total length of the rectifying unit 4 can be shortened by increasing the length of the rectifying path with respect to the total length of the rectifying unit 4 for the nozzle in which the discharge hole 53 is arranged on the extension line in the direction. The view of the first nozzle component of the nozzle 3 according to the fifth embodiment as viewed from the exposed surface side is the same as that of FIG. 2, and is therefore omitted.

It should be noted that the present invention can be implemented in various other forms without departing from its spirit, gist or main features. Therefore, the above embodiments are merely exemplary in all respects and should not be construed in a limited way.

The present invention can be applied to a fine bubble generator.

2 Fine bubble generator 3 Nozzle 30 Decompression swivel part 35 Generation part 36 Decompression guide flow path 361 Tapered flow path 37 Swirling space part 38 Discharge part 4 Rectifier part 41 Rectifier path 42 Change wall 43 Rectifier plate 44 One side of rectifier plate 45 The other side of the current plate
71 Projection piece 73 Conduction hole

Claims (3)

In a nozzle that generates fine bubbles in a gas-liquid dissolved liquid and discharges the generated fine bubbles to the outside.
A generator that generates fine bubbles in the gas-liquid dissolved liquid,
A rectifying section that is arranged on the downstream side of the generating section and regulates the flow of fine bubbles flowing out from the generating section through the flow hole.
A discharge unit, which is arranged on the downstream side of the rectifying unit and discharges fine bubbles to the outside, is provided.
In the rectifying section, the length of the rectifying path through which fine bubbles flow is longer than the total length of the rectifying section.
The rectifying unit includes a changing wall that is arranged at an angle with respect to the flow direction of the fine bubbles coming from the upstream to change the flow direction of the fine bubbles, and a cylindrical rectifying plate that rectifies the fine bubbles. Cylindrical protrusions arranged concentrically with the straightening vane are provided inside the straightening vane .
Both sides of the straightening vane are the wall surfaces of the straightening path, and the fine bubbles flowing out from the flow hole flow along the inner surface of the straightening vane and the outer peripheral surface of the protrusions, and then flow in the flow direction by the changing wall. Is changed in the opposite direction and flows along the outer surface of the current plate,
A nozzle characterized in that the discharge direction of fine bubbles in the discharge section and the flow direction of fine bubbles flowing from the generation section to the rectifying section are the same direction. In the nozzle according to claim 1,
The generating part is
A decompression guiding flow path that suppresses the pressure loss of the gas-liquid dissolved liquid by having a tapered flow path whose diameter gradually narrows from the upstream side to the downstream side.
A decompression swirl unit that applies a swirling force to the gas-liquid dissolved liquid arranged downstream of the decompression guide flow path,
A nozzle characterized by having a swirling space portion, which is a space in which a gas-liquid dissolved liquid to which a swirling force is applied by the decompression swirling portion flows while swirling. In a fine bubble generator that generates fine bubbles,
A fine bubble generator according to claim 1 or 2, wherein the nozzle is provided.

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