JP2022096114A - Fine air bubble generator - Google Patents

Abstract

To provide a fine air bubble generator which enables downsizing and can generate fine air bubbles.SOLUTION: A fine air bubble generator 1 is a device for generating fine air bubbles and includes: a fine air bubble generating body 2; and a housing 3 which houses the fine air bubble generating body 2. The fine air bubble generating body 2 includes: a columnar shaft 5 extending in an axial direction; and blades 6 protruding in a radial direction from the columnar shaft 5 and each having a prismatic shape. A radial length of the blade 6 is longer than a radius of the columnar shaft 5. The blades 6 are disposed so as to be along a spiral line.SELECTED DRAWING: Figure 1

Description

The present invention relates to a microbubble generator.

In recent years, nanobubble water in which nanobubbles, which are minute bubbles of 1 μm or less, are generated in a large amount in water has been verified to have various effects such as detergency and beauty effect, and is attracting attention. The nanobubble water generator has been improved in size, convenience, and ease of installation, and a device that can be used for home use is provided. As such a generator, a shower head built-in type in which a micro-bubble generator is built in the shower head (for example, Patent Document 1), and a type in which the micro-bubble generator is attached between the shower head and the hose as a hose joint (for example, Patent Document 1). For example, Patent Document 2) and the like are known.

Japanese Unexamined Patent Publication No. 2020-11134 Japanese Patent No. 6205099

By the way, the nanobubble generator is not limited to the shower head, and there are various needs depending on the mounting location and application. Among them, for example, if there is a type that is attached to the tip of a faucet in a kitchen or a washbasin, it is convenient because it has a wide range of uses.

However, the nanobubble generator of Patent Document 2 may be too long to be attached to the tip of a kitchen faucet and may be difficult to use. On the other hand, if it is shortened, the generation of nanobubbles may not be sufficient.

The present invention provides a microbubble generator capable of miniaturization and generating microbubbles.

The present invention [1] is a device for generating microbubbles, which includes a microbubble generator and a housing for accommodating the microbubble foam, and the microbubble generator extends in the axial direction. It comprises a cylindrical shaft and a plurality of blades radially protruding from the cylinder shaft and having a prismatic shape, the radial length of the blades being longer than the radius of the cylinder shaft, and the plurality of blades having a spiral shape. Includes a micro-bubble generator, located along the line of.

According to such an invention, since a plurality of blades having a prismatic shape are arranged, the water flowing into the microbubble generator can be made to collide with the blades a plurality of times. Further, since the radial length of the plurality of blades is larger than the radius of the cylindrical axis and the plurality of blades are arranged in a spiral shape, a sufficient space (flow path) through which water flows can be secured between the blades. At the same time, a smooth spiral water flow can be obtained. From these, a large amount of smooth water flow can be continuously brought into contact with a plurality of blades, and as a result, a large amount of nanobubbles can be generated. In addition, since a large amount of fine bubbles can be generated, a sufficient amount of fine bubbles can be generated even if the axial length (water flow direction) of the generator is shortened, so that the size can be reduced. As a result, even if it is attached to the tip of a faucet or the like, excessive pressure on the work space can be suppressed.

The present invention [2] includes the micro bubble generator according to the item [1], wherein the spiral spiral angle with respect to the axial direction is 45 degrees or less.

According to such an invention, more microbubbles can be generated.

In the present invention [3], the blade is a square pillar protruding in a substantially parallel quadrilateral shape, and the blade has an orthogonal plane orthogonal to the axial direction and a slope intersecting the orthogonal plane in the diagonal direction. The microbubble generator according to item [1] or [2], which has an axial length of the blade shorter than the orthogonal length of the orthogonal plane.

According to such an invention, since the blade has an orthogonal plane and a slope, microbubbles can be surely generated by the collision of the orthogonal plane and the slope, and water is smoothly guided in the spiral direction along the slope. can. Therefore, a larger amount of minute bubbles can be generated. Further, since the axial length of the blade is shorter than the orthogonal length of the orthogonal plane, the microbubble generator can be shortened in the axial direction, and the size can be reduced.

The present invention [4] includes the micro bubble generator according to any one of Items [1] to [3], wherein the axial length of the cylindrical axis is shorter than the spiral spiral period.

According to such an invention, since the axial length can be shortened, further miniaturization can be achieved.

In the present invention [5], the minute amount according to any one of the items [1] to [4], wherein the pitch between blades is longer than the circumferential length of the blades on the outer peripheral edge of the fine bubble generator. Includes bubble generator.

According to such an invention, since the width of the water flow path can be sufficiently secured, it is possible to suppress a decrease in water pressure discharged from the microbubble generator.

The present invention [6] includes the micro bubble generator according to any one of Items [1] to [5], wherein the housing has a fixing portion for fixing to the tip of the faucet.

According to such an invention, it can be easily attached to the faucet without the need for an attachment tool of a separate part.

The microbubble generator device of the present invention can be miniaturized and can generate a large amount of microbubbles.

FIG. 1 shows a schematic diagram of a usage state of the first embodiment of the microbubble generator of the present invention. FIG. 2 shows an exploded perspective view of the embodiment shown in FIG. FIG. 3 shows a perspective projection view of the microbubble generator of the embodiment shown in FIG. 1 when viewed from the side surface direction. FIG. 4 shows a perspective projection view of the microbubble generator of FIG. 3 when viewed from one side in the axial direction. FIG. 5 shows a perspective projection view of the microbubble generator used in the second embodiment of the microbubble generator of the present invention when viewed from the side surface direction. FIG. 6 shows a perspective projection view of the microbubble generator of FIG. 5 when viewed from one side in the axial direction.

<First Embodiment>
A first embodiment as an example of the microbubble generator of the present invention will be described with reference to FIGS. 1 to 4.

The micro-bubble generator 1 of the first embodiment (hereinafter, may be abbreviated as "generator") is a device attached to a faucet 20 to generate micro-bubbles as shown in FIGS. 1 to 2. Therefore, it includes a bubble generator (hereinafter, may be abbreviated as "generator") 2, a housing 3, and a mesh 4.

The generator 2 is a member for generating minute bubbles in water flowing from one side (upstream side) in the axial direction, and as shown in FIGS. 3 to 4, a cylindrical shaft 5 and a plurality of blades 6 are formed. And a crown 7.

The columnar shaft 5 is a portion that supports a plurality of blades 6 and has a columnar shape extending in the axial direction (vertical direction).

The plurality of blades 6 are portions that generate minute bubbles in water, and are arranged so as to project radially from the peripheral side surface of the cylindrical shaft 5. The plurality of blades 6 have the same shape as each other and are parallelepipeds. That is, the blade 6 is a quadrangular prism having a substantially parallel quadrilateral shape in a side view. Further, in the cross-sectional view orthogonal to the axial direction, the rectangular shape has a long rectangular shape in the radial direction, and the rectangular shape rotates in the circumferential direction (counterclockwise) of the cylindrical axis 1 toward the other side in the axial direction. It is formed like this. The outer peripheral edge of the blade 6 is curved along the inner peripheral edge of the main body 12 of the housing 3 when viewed from the axial direction. That is, the radial outer surface (the surface forming the parallel quadrilateral shape) of the blade 6 is formed in an arc shape. The blade 6 has an orthogonal surface 8 and a slope 9 extending radially from the cylindrical axis 7 to the radial outer surface.

The orthogonal plane 8 is a plane that is orthogonal to the axial direction and faces one end side (upper side) in the axial direction. The orthogonal plane 8 has a substantially rectangular shape that is long in the radial direction when viewed from the axial direction. The orthogonal length L1 of the orthogonal plane 8 is shorter than the axial length L2 of the blade 6.

The slope 9 is a surface that extends in an oblique direction (intersection direction) with the orthogonal surface 8 and faces one side in the axial direction. That is, the slope 9 is a surface that is continuous with the orthogonal surface 8 and forms an obtuse angle together with the orthogonal surface 8 in the side view.

A plurality (35 pieces) of blades 6 are provided on the peripheral side surface of the cylindrical shaft 5, and the blades 6 are regularly arranged from one end to the other end in the axial direction of the cylinder shaft 5. Specifically, a plurality of (five) blades radially protruding from the cylindrical shaft 5 constitute a set of propeller-shaped blade groups 10, and the propeller-shaped blade groups 10 are spaced apart in the axial direction. , Multiple (7 sets) are arranged. The plurality of propeller-shaped blade groups 10 are arranged at equal intervals in the axial direction so as to be parallel to each other.

The plurality of blades 6 are provided on the side surface of the cylindrical shaft 5 so as to be along a spiral line Y having the axial direction of the cylindrical shaft 5 (particularly, an axial straight line passing through the center of the cylindrical shaft 5) as the spiral axis X. Have been placed. In particular, the plurality of blades 6 are arranged on a spiral having a gentle spiral angle θ ₁ . Specifically, in the positional relationship between two blades 6 adjacent to each other at an axial distance from each other, one blade 6 and the other blade 6 are visually viewed from one side in the axial direction toward the other side. It is located so that it overlaps with each other and is slightly offset in the circumferential direction. That is, when viewed from the axial direction, the other blades 6 arranged on the other side in the axial direction are counterclockwise with respect to one blade 6 located on the other side in the axial direction (orthogonal surface 8 of the blade 6). Slightly offset (in the circumferential direction from to slope 9).

In the generator 2, there are a plurality of sets of blade groups arranged in a spiral shape. That is, when viewed from the radial direction, a plurality of (seven) blades 6 that are close to each other in the axial direction constitute a row of spiral blade groups 11, and the spiral blade groups 11 are equal in the circumferential direction. Multiple rows (5 rows) are arranged at intervals. In other words, a plurality of sets (7 sets) of propeller-shaped blade groups 1 are arranged at equal intervals in the axial direction so as to rotate in the circumferential direction (spiral). As a result, a plurality of (five) large spiral flow paths are formed between the spiral blade groups 11 while arranging a large number (35) of the blades 6.

The crown 7 is a portion for guiding the water flowing into the generator 1 to the blade 6 located on the outer side in the circumferential direction of the generator 2 and the flow path between them, and is one end in the axial direction of the cylindrical shaft 5. Is located in. The crown 7 has a conical shape with one end in the axial direction as the apex and the diameter increases toward the other side in the axial direction.

The axial length T of the cylindrical axis 5 is shorter than the spiral period λ (the axial length until the spiral goes around the circumferential axis 5). That is, one spiral blade group 11 does not go around the cylindrical shaft 5. Specifically, the axial length T of the cylindrical shaft 5 is, for example, 10 mm or more, preferably 25 mm or more, and for example, 50 mm or less, preferably 40 mm or less. The radius r of the cylindrical shaft 5 is, for example, 2 mm or more, preferably 4 mm or more, and for example, 10 mm or less, preferably 8 mm or less. In FIG. 4, the spiral period λ is shown as a quarter length.

As shown by the alternate long and short dash line in FIG. 3, the spiral angle θ ₁ is an angle formed by the spiral axis X and the spiral line Y, and is 45 degrees or less, preferably 30 degrees or less, and for example, for example. It is 5 degrees or more, preferably 10 degrees or more.

The angle θ ₂ of the circumferential deviation of the two blades 6 adjacent to each other in the axial direction is, for example, 5 degrees or more, preferably 10 degrees or more, and for example, 30 degrees or less, preferably 20 degrees or less. Is.

The radial length (height of the prism) L3 of each blade 6 is longer than the radius r of the cylindrical shaft 5, for example, 1.3 times or more, preferably 1.5 times or more the radius r, and also. For example, it is 5 times or less, preferably 3 times or less. Specifically, the radial length L3 of the blade 6 is, for example, 4 mm or more, preferably 6 mm or more, and for example, 15 mm or less, preferably 12 mm or less.

The orthogonal length L1 of the orthogonal surface 8 and the slope length L4 of the slope 9 in each blade 6 are, for example, 2 mm or more, preferably 3 mm or more, and for example, 10 mm or less, preferably 8 mm, respectively. It is as follows.

The axial length (height of the parallelogram) L2 of the blade 6 is shorter than the orthogonal length L1 of the orthogonal plane 8, for example, 0.9 times or less and 0.5 times or more the orthogonal length L1. Is. Specifically, the axial length L2 is, for example, 2 mm or more, preferably 3 mm or more, and for example, 10 mm or less, preferably 5 mm or less.

At the outer peripheral edge of the generator 2, the blade-to-blade pitch p in the circumferential direction is longer than the circumferential length L5 of the blade 6. Specifically, the pitch p is, for example, 1.5 times or more, preferably 2.0 times or more, preferably 5.0 times or more, preferably 5.0 times or less, preferably 3. It is 0 times or less.

The axial length of the crown 7 is, for example, 1 mm or more, preferably 3 mm or more, and for example, 10 mm or less, preferably 5 mm or less.

Examples of the material of the generator 2 include polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), ethylene vinyl acetate copolymer (EVA), polyvinyl chloride (PVC), polyvinylidene chloride (PVDC), and the like. Examples thereof include resins such as polyacetal (POM), silicone rubber and ABS resin, for example, metals such as aluminum, stainless steel and brass, and resin is preferable. Further, the cylindrical shaft 5, the plurality of blades 6, and the crown 7 are integrally molded from these materials.

The housing 3 is a container for accommodating the generator 2 and attached to a faucet or the like, and includes a main body portion 12 and a lid portion 13.

The main body 12 can accommodate the generator 2 inside and has a bottomed cylindrical shape. The inner side surface of the main body 12 substantially coincides with the virtual circumference formed by the outer peripheral edge of the generator 2, and the axial length of the main body 12 is slightly longer than the axial length T of the generator 2.

A circular opening 14 for allowing water to pass through is formed at the bottom of the main body 12. The opening 14 is formed so as to be larger than the cylindrical shaft 5. Further, an internal screw 15 is formed inside the upper end portion of the main body portion 12, so that the internal screw 15 can be fixed to the lid portion 13.

The lid portion 13 can be fixed to the main body portion 12, and the generator 2 is housed inside together with the main body portion 12. The lid portion 13 has a cylindrical shape that opens upward and downward. An internal screw 15 as an example of the fixing portion is formed inside the upper end portion of the lid portion 13 so as to be able to be fixed to the faucet 20. Further, an external screw 16 is formed on the outside of the lower end portion of the lid portion 13, and can be fixed by fitting with the internal screw 17 of the main body portion 12.

Examples of the material of the housing 3 include the same resin or metal as those exemplified in the generator 2.

The mesh 4 is a member for allowing water to pass through and supporting the generator 2. The outer shape of the mesh 4 coincides with the inner side surface of the main body portion 12. The mesh 4 is arranged at the bottom of the main body 12.

The generator 1 is attached to the tip of a faucet (faucet) 20 such as a kitchen or a washbasin, for example, as shown in FIG. That is, the internal screw 17 of the poetry portion 13 is fixed to the faucet 20 so that the axial direction and the vertical direction of the generator 2 coincide with each other. As a result, the water discharged downward from the faucet 20 passes through the generator 1 to generate nanobubbles (microbubbles having a diameter of 1000 nm or less) in the water flow, resulting in a large amount of nanobubbles. The nanobubble water contained in can be easily obtained.

At this time, the water discharged from the faucet 20 flows in from the upper opening of the lid portion 13, collides with the crown portion 7, and diffuses and moves outward in the circumferential direction. After that, the water collides with the orthogonal plane 8 and the slope 9 of the blade 6 at the uppermost stage (one end in the axial direction) of the blade 6, and then falls spirally along the plurality of slopes 9 located on the lower side. And it is released from the opening 14.

In particular, in this microbubble generator 1, since the plurality of blades 6 are arranged in a spiral shape, the water flow can be continuously collided with the plurality of blades 6 in multiple stages. Further, since the radial length L3 of the plurality of blades 6 is longer than the radius r of the cylindrical shaft 5, the width of the space (flow path) through which water flows between the blades can be widened, and a sufficient flow path can be secured. In addition, since the plurality of blades 6 are arranged in a spiral shape, a smooth spiral water flow can be obtained as compared with the case where the blades 6 are randomly arranged. That is, a large amount of smooth water flow can be continuously brought into contact with the plurality of blades 6. Therefore, a large amount of nanobubbles can be generated.

Further, since a large amount of nanobubbles can be generated, a sufficient amount of nanobubbles can be generated even if the axial (water flow direction) length T of the generator 2 is shortened, so that the size can be reduced. Therefore, even if it is attached to the tip of a faucet or the like, excessive pressure on the work space can be suppressed.

Further, since a large amount of water flow can be smoothly discharged to the outside, it is possible to suppress a large decrease in water pressure and water amount due to the installation of the microbubble generator 2 in the water path.

Further, in the generator 1, the spiral spiral angle θ ₁ of the blade 6 with respect to the axial direction is 45 degrees or less. Therefore, more nanobubbles can be generated.

Further, in the generator 1, the blade 6 is a quadrangular prism projecting in a substantially parallel quadrilateral shape, has an orthogonal surface 8 and a slope, and the axial length L2 of the blade 6 is an orthogonal surface 8. Is shorter than the orthogonal length L1. Therefore, nanobubbles can be reliably generated by the collision of the orthogonal plane 8 and the slope 9, and water can be smoothly guided in the spiral direction along the slope. Therefore, a larger amount of nanobubbles can be generated. Further, since the axial length L2 of the blade 6 is shorter than the orthogonal length L1 of the orthogonal plane 8, the axial length T of the generator 2 can be shortened, and the size can be reduced. At the same time, since the slope length L4 of the slope 9 is longer than the axial length L2, the area in contact with the water flow can be increased, so that nanobubbles are efficiently generated with a shorter axial length. Can be made to.

Further, in the generator 1, the axial length T of the cylindrical shaft 5 is shorter than the spiral period λ. Therefore, further miniaturization can be achieved. Further, since the water is discharged from the generator 1 before making one round of the spiral, smooth drainage is possible, and a large decrease in water pressure and water amount can be suppressed.

Further, in the generator 1, since the circumferential length L5 of the blade 6 is longer than the blade-to-blade pitch p at the outer peripheral edge of the generator 2, the width of the water flow path can be sufficiently secured. Therefore, it is possible to suppress a decrease in the water pressure extracted from the opening 14 of the generator 1.

Further, in the generator 1, since the housing 3 has the internal screw 17, it can be easily attached to the faucet 20 without the need for an attachment tool of another part.

<Second Embodiment>
A second embodiment of the microbubble generator of the present invention will be described with reference to FIGS. 5 to 6. The same members as those in the first embodiment are designated by the same reference numerals as those in the first embodiment, and the description thereof will be omitted.

The plurality of blades 6 are arranged along the spiral line Y with the axial direction of the cylindrical shaft 5 as the spiral axis X. In particular, the plurality of blades 6 are arranged on a spiral having a steep spiral angle θ ′ ₁ . Specifically, in the positional relationship between two blades 6 adjacent to each other at an axial distance from each other, one blade 6 and the other blade 6 are viewed from one side in the axial direction toward the other side. It is located so that it deviates significantly in the circumferential direction (counterclockwise). That is, when viewed from the axial direction, the other blades 6b arranged on the other side in the axial direction are counterclockwise with respect to one blade 6 located on the other side in the axial direction (orthogonal surface 8 of the blade 6). There is a large deviation (in the circumferential direction from to the slope 9).

The spiral angle _θ'1 exceeds 45 degrees and is, for example, 50 degrees or more, and is, for example, 85 degrees or less, preferably 65 degrees or less. The angle θ'2 of the circumferential deviation of the _two blades 6 adjacent to each other in the axial direction is, for example, more than 30 degrees, preferably 40 degrees or more, and for example, 60 degrees or less, preferably preferably. It is 50 degrees or less.

Similar to the first embodiment, the generator 1 of the second embodiment can be miniaturized and can generate a large amount of nanobubbles. Further, since the spiral angle θ'1 of the generator ₁ exceeds 45 degrees, nanobubbles having a smaller bubble size can be generated.

<Modification example>
The microbubble generator 1 of the present invention is not limited to the first embodiment and the second embodiment, and examples of other embodiments are shown below.

For example, the number of blades 6 constituting one propeller-shaped blade group 1, that is, the number of radially extending blades 6 existing in the circumferential direction at a specific axial position is five in the first and second embodiments. However, the present invention is not limited to this, and can be, for example, in the range of 4 to 6. 5 is most preferable from the viewpoint of the water pressure of the water discharged from the generator 1 and the amount of nanobubbles.

Further, the number of blades 6 constituting one spiral blade group 11, that is, the number of blades 6 existing in the axial direction is seven in the first and second embodiments, but is not limited thereto. For example, it can be in the range of 5-10. 7 is most preferable from the viewpoint of the water pressure of the water discharged from the generator 1 and the amount of nanobubbles.

Further, in the first and second embodiments, the internal screw 17 is provided as an example of the fixing portion, but depending on the type of the tip of the faucet, for example, an external screw type fixing portion may be provided. Other attachments such as fixing rings may be provided. Further, another member such as a shower changeover switch may be provided at the other end of the housing 2 in the axial direction.

Further, in the first and second embodiments, the type is attached near the most downstream side (water discharge portion) of the water path, but for example, the microbubble generator 1 may be attached in the middle of the water path. good. In this case, fixing portions (for example, internal screws and external screws) that can be attached to other members are provided at both ends of the housing 3 in the axial direction. Specific examples of such types include a hose joint for installation between the faucet and the hose, an adapter for the discharge nozzle for installation between the discharge device (shower head, etc.) and the hose, and the use of water. Examples include adapters for electrical appliances to be installed between electrical appliances (washing machines, dishwashers, etc.) and hoses.

<Example>
Hereinafter, the microbubble generator of the present invention will be described in more detail with reference to examples. However, the microbubble generator of the present invention is not limited to the following examples.

(Example 1)
The microbubble generators shown in FIGS. 1 to 4 were manufactured. In addition, in the microbubble generator, the following sizes and materials were used.

The orthogonal plane 8 has an orthogonal length L1: 4 mm, the blade 6 has an axial length L2: 3 mm, the blade 6 has a radial length L3: 8 mm, the slope 9 has a slope length L4: 5 mm, and the circumference at the outer peripheral edge. Ratio of blade pitch p to directional length L5 (p / L5): 2.5 times, axial length T of generator 2: 33 mm, radius r of columnar shaft 5: 4 mm, spiral angle θ ₁ : 15 degrees, Angle of deviation θ ₂ : 12 degrees, apex length: 4 mm, material: polypropylene

(Example 2)
A microbubble generator was produced in the same manner as in Example 1 except that the spiral angle ( _θ'1 ) was about 50 degrees and the deviation angle ( _θ'2 ) was about 45 degrees (see FIGS. 5 to 6). ).

(evaluation)
The micro-bubble generators of Example 1 and Example 2 were attached to the tips of the faucets of the kitchen, respectively, and water was allowed to flow through the micro-bubble generator. The minute bubbles contained in the water were measured under the following conditions.
Measuring device: Nanosight LM10V-HS (Malvern, CMOS camera, purple laser 405 nm)
Analysis software: NTA3.4
Water temperature: Approximately 20 degrees Standard particles that can be used as a reference for bubble particle size: Polystyrene latex particles 100 nm (manufactured by Thermoscientific)

The sample water that had passed through the microbubble generator was injected into the module cell of the device using a syringe. Subsequently, the laser was examined, scattered light was observed, and the observed image was processed by tracking analysis (NTA analysis) to prepare a particle size distribution map.

As a result, in the sample water of Example 1, the amount of bubbles having a particle size of 1000 nm or less was 4.99 × 10 ⁸ cells / mL, and the particle size was D ₁₀ : 80.4 nm and D ₅₀ : 132.0 nm. rice field.

In the sample water of Example 2, the amount of bubbles having a particle size of 1000 nm or less was 3.78 × 10 ⁸ cells / mL, and the particle size was D ₁₀ : 69.4 nm and D ₅₀ : 102.6 nm.

In the sample water that did not pass through the generator, the amount of bubbles having a particle size of 1000 nm or less was 2.77 × ₁₀ ⁸ cells / mL, and the particle size was D10: 78.3 nm and _D50 : 118.8 nm. rice field.

1 Micro bubble generator, 2 Bubble generator, 3 Housing, 4 mesh, 5 Cylindrical axis, 6 blades, 7 crown, 8 orthogonal planes, 9 slopes, 10 propeller-shaped blades, 11 spiral blades, 12 main bodies Part, 13 lid, 14 opening, 15 internal thread, 16 external thread, 17 internal thread, 20 faucet, θ ₁ spiral angle, θ ₂ angle of deviation between blades

The present invention relates to a microbubble generator.

In recent years, nanobubble water, which is a large amount of nanobubbles that are microbubbles of 1 μm or less, has been verified to have various effects such as detergency and beauty effect, and is attracting attention. The nanobubble water generator has been improved in size, convenience, and ease of installation, and a device that can be used for home use is provided. As such a generator, a shower head built-in type (for example, Patent Document 1) in which a micro bubble generator is built in the shower head, and the micro bubble generator is attached between the shower head and the hose as a hose joint. Types (eg, Patent Document 2) and the like are known.

The present invention provides a microbubble generator capable of miniaturization and generating microbubbles.

The present invention [1] is a device for generating microbubbles, which includes a microbubble generator and a housing for accommodating the microbubble generator , and the microbubble generator includes the microbubble generator. A cylindrical shaft extending in the axial direction and a plurality of blades protruding radially from the cylinder shaft and having a prismatic shape, the radial length of the blades being longer than the radius of the cylinder shaft, and the plurality of blades. The blades include microbubble generators that are arranged along a spiral line.

According to such an invention, since a plurality of blades having a prismatic shape are arranged, water flowing into the microbubble generator can be made to collide with the blades a plurality of times. Further, since the radial length of the plurality of blades is larger than the radius of the cylindrical axis and the plurality of blades are arranged in a spiral shape, a sufficient space (flow path) through which water flows can be secured between the blades. At the same time, a smooth spiral water flow can be obtained. From these, a large amount of smooth water flow can be continuously brought into contact with a plurality of blades, and as a result, a large amount of nanobubbles can be generated. In addition, since a large amount of microbubbles can be generated, a sufficient amount of microbubbles can be generated even if the axial length (water flow direction) of the generator is shortened, so that the size can be reduced. As a result, even if it is attached to the tip of a faucet or the like, excessive pressure on the work space can be suppressed.

The present invention [2] includes the microbubble generator according to the item [1], wherein the spiral spiral angle with respect to the axial direction is 45 degrees or less.

According to such an invention, more microbubbles can be generated.

In the present invention [3], the blade is a square pillar protruding in a substantially parallel quadrilateral shape, and the blade has an orthogonal plane orthogonal to the axial direction and a slope intersecting the orthogonal plane in the diagonal direction. The microbubble generator according to item [1] or [2], which has an axial length of the blade shorter than the orthogonal length of the orthogonal plane.

According to such an invention, since the blade has an orthogonal plane and a slope, microbubbles can be surely generated by the collision of the orthogonal plane and the slope, and water can be smoothly spiraled along the slope. Can be guided. Therefore, a larger amount of fine bubbles can be generated. Further, since the axial length of the blade is shorter than the orthogonal length of the orthogonal plane, the microbubble generator can be shortened in the axial direction, and the size can be reduced.

The present invention [4] includes the microbubble generator according to any one of Items [1] to [3], wherein the axial length of the cylindrical axis is shorter than the spiral spiral period. ..

The present invention [5] is described in any one of Items [1] to [4], wherein the pitch between blades is longer than the circumferential length of the blades on the outer peripheral edge of the microbubble generator. Includes a microbubble generator.

According to such an invention, since the width of the water flow path can be sufficiently secured, it is possible to suppress a decrease in water pressure discharged from the microbubble generator.

The present invention [6] includes the micro bubble generator according to any one of Items [1] to [5], wherein the housing has a fixing portion for fixing to the tip of the faucet.

The microbubble generator device of the present invention can be miniaturized and can generate a large amount of microbubbles .

FIG. 1 shows a schematic diagram of a usage state of the first embodiment of the microbubble generator of the present invention. FIG. 2 shows an exploded perspective view of the embodiment shown in FIG. FIG. 3 shows a perspective projection view of the microbubble generator of the embodiment shown in FIG. 1 when viewed from the side surface direction. FIG. 4 shows a perspective projection view of the microbubble generator of FIG. 3 when viewed from one side in the axial direction. FIG. 5 shows a perspective projection view of the microbubble generator used in the second embodiment of the microbubble generator of the present invention when viewed from the side surface. FIG. 6 shows a perspective projection view of the microbubble generator of FIG. 5 when viewed from one side in the axial direction.

<First Embodiment>
A first embodiment as an example of the microbubble generator of the present invention will be described with reference to FIGS. 1 to 4.

As shown in FIGS. 1 and 2, the microbubble generator 1 of the first embodiment (hereinafter, may be abbreviated as “generator”) is attached to the faucet 20 to generate microbubbles . The device includes a bubble generator (hereinafter, may be abbreviated as "generator") 2, a housing 3, and a mesh 4.

The generator 2 is a member for generating fine bubbles in water flowing from one side (upstream side) in the axial direction, and as shown in FIGS. 3 to 4, a cylindrical shaft 5 and a plurality of blades are used. 6 and a crown 7 are provided.

The plurality of blades 6 are portions at which fine bubbles are generated in water, and are arranged so as to project radially from the peripheral side surface of the cylindrical shaft 5. The plurality of blades 6 have the same shape as each other and are parallelepipeds. That is, the blade 6 is a quadrangular prism having a substantially parallel quadrilateral shape in a side view. Further, in the cross-sectional view orthogonal to the axial direction, the rectangular shape has a long rectangular shape in the radial direction, and the rectangular shape rotates in the circumferential direction (counterclockwise) of the cylindrical axis 1 toward the other side in the axial direction. It is formed like this. The outer peripheral edge of the blade 6 is curved along the inner peripheral edge of the main body 12 of the housing 3 when viewed from the axial direction. That is, the radial outer surface (the surface forming the parallel quadrilateral shape) of the blade 6 is formed in an arc shape. The blade 6 has an orthogonal surface 8 and a slope 9 extending radially from the cylindrical axis 7 to the radial outer surface.

The generator 1 is attached to the tip of a faucet (faucet) 20 such as a kitchen or a washbasin, for example, as shown in FIG. That is, the internal screw 17 of the lid portion 13 is fixed to the faucet 20 so that the axial direction and the vertical direction of the generator 2 coincide with each other. As a result, the water discharged downward from the faucet 20 passes through the generator 1 to generate nanobubbles ( microbubbles having a diameter of 1000 nm or less) in the water flow, and as a result, nanobubbles are generated. Nanobubble water containing a large amount can be easily obtained.

In particular, in this microbubble generator 1, since the plurality of blades 6 are arranged in a spiral shape, the water flow can be continuously collided with the plurality of blades 6 in multiple stages. Further, since the radial length L3 of the plurality of blades 6 is longer than the radius r of the cylindrical shaft 5, the width of the space (flow path) through which water flows between the blades can be widened, and a sufficient flow path can be secured. In addition, since the plurality of blades 6 are arranged in a spiral shape, a smooth spiral water flow can be obtained as compared with the case where the blades 6 are randomly arranged. That is, a large amount of smooth water flow can be continuously brought into contact with the plurality of blades 6. Therefore, a large amount of nanobubbles can be generated.

Further, since a large amount of water flow can be smoothly discharged to the outside, it is possible to suppress a large decrease in water pressure and water amount due to the installation of the microbubble generator 2 in the water path.

Further, in the generator 1, the blade 6 is a quadrangular prism projecting in a substantially parallel quadrilateral shape, has an orthogonal surface 8 and a slope 9 , and the axial length L2 of the blade 6 is an orthogonal surface 8. Is shorter than the orthogonal length L1. Therefore, nanobubbles can be reliably generated by the collision of the orthogonal plane 8 and the slope 9, and water can be smoothly guided in the spiral direction along the slope. Therefore, a larger amount of nanobubbles can be generated. Further, since the axial length L2 of the blade 6 is shorter than the orthogonal length L1 of the orthogonal plane 8, the axial length T of the generator 2 can be shortened, and the size can be reduced. At the same time, since the slope length L4 of the slope 9 is longer than the axial length L2, the area in contact with the water flow can be increased, so that nanobubbles are efficiently generated with a shorter axial length. Can be made to.

<Second Embodiment>
A second embodiment of the microbubble generator of the present invention will be described with reference to FIGS. 5 to 6. The same members as those in the first embodiment are designated by the same reference numerals as those in the first embodiment, and the description thereof will be omitted.

<Modification example>
The microbubble generator 1 of the present invention is not limited to the first embodiment and the second embodiment, and examples of other embodiments are shown below.

Further, in the first and second embodiments, the type is attached near the most downstream side (water discharge portion) of the water path, but for example, the microbubble generator 1 is a type attached in the middle of the water path. May be good. In this case, fixing portions (for example, internal screws and external screws) that can be attached to other members are provided at both ends of the housing 3 in the axial direction. Specific examples of such types include a hose joint for installation between the faucet and the hose, an adapter for the discharge nozzle for installation between the discharge device (shower head, etc.) and the hose, and the use of water. Examples include adapters for electrical appliances to be installed between electrical appliances (washing machines, dishwashers, etc.) and hoses.

<Example>
Hereinafter, the microbubble generator of the present invention will be described in more detail with reference to examples. However, the microbubble generator of the present invention is not limited to the following examples.

(Example 1)
The microbubble generators shown in FIGS. 1 to 4 were manufactured. In addition, in the microbubble generator, the following sizes and materials were used.

(Example 2)
Microbubble generators were produced in the same manner as in Example 1 except that the spiral angle (θ ′ ₁ ) was about 50 degrees and the deviation angle (θ ′ ₂ ) was about 45 degrees (FIGS. 5 to 6). reference).

(evaluation)
The microbubble generators of Example 1 and Example 2 were attached to the tips of the faucets of the kitchen, respectively, and water was allowed to flow through the microbubble generators. The micro bubbles contained in the water were measured under the following conditions.
Measuring device: Nanosight LM10V-HS (Malvern, CMOS camera, purple laser 405 nm)
Analysis software: NTA3.4
Water temperature: Approximately 20 degrees Standard particles that can be used as a reference for bubble particle size: Polystyrene latex particles 100 nm (manufactured by Thermoscientific)

The sample water that had passed through the microbubble generator was injected into the module cell of the above device using a syringe. Subsequently, the laser was examined, scattered light was observed, and the observed image was processed by tracking analysis (NTA analysis) to prepare a particle size distribution map.

1 Micro bubble generator, 2 Bubble generator, 3 Housing, 4 mesh, 5 Cylindrical axis, 6 blades, 7 crown, 8 orthogonal planes, 9 slopes, 10 propeller-shaped blades, 11 spiral blades, 12 Main body, 13 lid, 14 openings, 15 internal threads, 16 external threads, 17 internal threads, 20 faucets, θ ₁ spiral angle, θ ₂ angle of deviation between blades

( Reference example 1 )
A microbubble generator was produced in the same manner as in Example 1 except that the spiral angle ( _θ'1 ) was about 50 degrees and the deviation angle ( _θ'2 ) was about 45 degrees (see FIGS. 5 to 6). ).

(evaluation)
The micro-bubble generators of Example 1 and Reference Example 1 were attached to the tips of the faucets of the kitchen, respectively, and water was allowed to flow through the micro-bubble generator. The minute bubbles contained in the water were measured under the following conditions.
Measuring device: Nanosight LM10V-HS (Malvern, CMOS camera, purple laser 405 nm)
Analysis software: NTA3.4
Water temperature: Approximately 20 degrees Standard particles that can be used as a reference for bubble particle size: Polystyrene latex particles 100 nm (manufactured by Thermoscientific)

In the sample water of Reference Example 1 , the amount of bubbles having a particle size of 1000 nm or less was 3.78 × 10 ⁸ cells / mL, and the particle size was D ₁₀ : 69.4 nm and D ₅₀ : 102.6 nm.

Claims (6)

It is a device for generating minute bubbles,
With a micro bubble generator,
It is provided with a housing for accommodating the microbubble foam.
The micro bubble generator is
A cylindrical axis extending in the axial direction and
It is provided with a plurality of blades having a prismatic shape protruding radially from the columnar axis.
The radial length of the blade is longer than the radius of the cylindrical axis.
The microbubble generator, characterized in that the plurality of blades are arranged along a spiral line. The microbubble generator according to claim 1, wherein the spiral spiral angle with respect to the axial direction is 45 degrees or less. The blade is a quadrangular prism protruding in a substantially parallel quadrilateral shape.
The blade
Orthogonal planes orthogonal to the axial direction and
It has an orthogonal plane and a slope that intersects in an oblique direction.
The microbubble generator according to claim 1 or 2, wherein the axial length of the blade is shorter than the orthogonal length of the orthogonal plane. The microbubble generator according to any one of claims 1 to 3, wherein the length of the cylindrical axis in the axial direction is shorter than the spiral period of the spiral. The microbubble generator according to any one of claims 1 to 4, wherein the pitch between the blades on the outer peripheral edge of the microbubble generator is longer than the circumferential length of the blades. The microbubble generating device according to any one of claims 1 to 5, wherein the housing has a fixing portion for fixing to the tip of the faucet.

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