Microbubble generating device

Abstract

To provide a tool capable of generating a large amount of fine bubbles and removing chlorine, which can be miniaturized while suppressing a drop in water pressure. [Solution] The microbubble generator (1) comprises a cylindrical housing (2) having a water supply opening (12) on the upper side and a discharge opening (14) on the lower side, a bottomed cylinder (3) arranged inside the cylindrical housing (2), a microbubble generator (5) arranged inside the bottomed cylinder (3), and a chlorine removal unit arranged inside the cylindrical housing (2) and outside the bottomed cylinder (3). The bottomed cylinder (3) has a cylindrical opening (15) at its upstream end that communicates with the water supply opening (12), and a bottom at its downstream end that is spaced apart from the discharge opening. A plurality of through-holes (18) are formed in the side surface of the bottomed cylinder (3). The microbubble generator (5) comprises a shaft (22) extending in the water flow direction and a plurality of rectangular pillars (23) formed on the side surface of the shaft (22). The chlorine removal unit (6) comprises a plurality of chlorine removal particles (24).

Description

[Technical Field]

[0001] The present invention relates to a microbubble generating device. [Background technology]

[0002] In recent years, nanobubble water, which is water containing a large amount of nanobubbles—microbubbles with a diameter of 1 μm or less—has been attracting attention due to its various verified effects, including cleansing ability and beauty benefits. Nanobubble water generators have been improved, including by being made smaller, and devices for home use, such as shower heads, are now available. Known examples of such generators include a showerhead-integrated type in which a microbubble generator is built into the showerhead (see Patent Document 1) and a type in which a microbubble generator is attached as a hose connector between the showerhead and hose (see Patent Document 2). Also known is a shower water purifier equipped with activated carbon that can remove chlorine, with the aim of reducing damage to skin and hair (see Patent Document 3). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-11034 [Patent Document 2] Japanese Patent Application Laid-Open No. 2018-34133 [Patent Document 3] Japanese Patent Application Laid-Open No. 2005-052818 Summary of the Invention [Problem to be solved by the invention]

[0004] However, when we investigated devices that can remove chlorine while generating nanobubbles, we found that simply combining the shower head or generator described in Patent Documents 1 and 2 with the shower water purifier described in Patent Document 3 would result in a long length in the direction of water flow, which is disadvantageous in terms of miniaturization. Also, if many components, such as micro-device generators and chlorine removal components, are placed in the water supply system in the direction of water flow, there is a possibility that water pressure will decrease.

[0005] An object of the present invention is to provide a device that can generate a large amount of microbubbles and remove chlorine, and that can be made smaller while suppressing a drop in water pressure. [Means for solving the problem]

[0006] In order to solve the above problems, the present invention includes the following inventions.

[0007] The present invention [1] comprises a cylindrical casing extending in a first direction, having a water supply opening on one side in the first direction and a discharge opening on the other side in the first direction, a bottomed cylinder arranged inside the cylindrical casing and extending in the first direction, a microbubble generator arranged inside the bottomed cylinder, and a chlorine removal unit arranged inside the cylindrical casing and outside the bottomed cylinder, wherein the bottomed cylinder has an opening at one end of the bottomed cylinder on the one side in the first direction that communicates with the water supply opening, and the bottomed cylinder has a bottom at the other end of the bottomed cylinder in the first direction that is positioned at an interval from the discharge opening, and a plurality of through holes are formed in the side of the bottomed cylinder, the microbubble generator has a shaft extending in the first direction and a plurality of rectangular pillars formed on the side of the shaft, and the chlorine removal unit includes a microbubble generating device having a plurality of chlorine removal particles.

[0008] With this microbubble generator, water flowing in through the water supply opening of the cylindrical housing collides with the microbubble generator located inside the bottomed cylinder, which shares the opening, generating a large amount of microbubbles in the water. Furthermore, the water containing a large amount of microbubbles (microbubble water) passes through the through-holes in the side of the bottomed cylinder and reaches the chlorine removal unit, where chlorine is removed from the microbubble water. Since at least a portion of the chlorine removal unit is located on the side of the microbubble generator (i.e., at a position perpendicular to the first direction), the length in the first direction can be shortened compared to when the microbubble generator and the chlorine removal unit are directly connected in the first direction, allowing for miniaturization. Furthermore, since the chlorine removal unit includes multiple chlorine-removing particles, the microbubble water can smoothly move through the gaps between the particles, which have a large degree of freedom, to reach the discharge opening, thereby preventing a decrease in water pressure. Furthermore, since the chlorine removal unit includes chlorine-removing particles with a large surface area, chlorine removal is efficient.

[0009] The present invention [2] includes the microbubble generator according to [1], wherein the average particle size of the plurality of chlorine-removing particles is 1 mm or more and 5 mm or less.

[0010] With this microbubble generator, the chlorine-removing particles have an appropriate size, which increases the surface area of ​​contact between the microbubble water and the chlorine-removing particles, while preventing the particles from dissolving in the water and becoming smaller, leading to the leakage of particles to the outside. This improves the chlorine-removing effect and maintains that effect for a long period of time.

[0011] The present invention [3] includes the microbubble generator according to [1] or [2], wherein the chlorine-removing particles are calcium sulfite particles.

[0012] According to such a microbubble generating device, the water containing a large amount of microbubbles can suppress the surface denaturation of calcium sulfite particles, thereby allowing the chlorine removal effect to be maintained for a longer period of time.

[0013] The present invention [4] includes the microbubble generator according to any one of [1] to [3], wherein the volume of the chlorine removing section is larger than the volume of the bottomed cylinder.

[0014] Such a microbubble generating device can further improve the effect of removing chlorine.

[0015] The present invention [5] includes the microbubble generator according to any one of [1] to [4], wherein the plurality of through holes are formed to extend in a first direction, and the circumferential length of the plurality of through holes is smaller than the average particle diameter of the plurality of chlorine removal particles.

[0016] With this type of microbubble generator, water that collides with the microbubble generator can be efficiently moved to the outside of the bottomed cylinder, i.e., to the chlorine removal section. This prevents a drop in water pressure. Furthermore, because the chlorine removal particles cannot pass through the through-holes of the bottomed cylinder and penetrate into its interior, microbubble generation by the microbubble generator inside the bottomed cylinder is not hindered, allowing for more reliable microbubble generation.

[0017] The present invention [6] includes the microbubble generator according to any one of [1] to [5], wherein the plurality of rectangular pillars are arranged in a spiral.

[0018] With this type of microbubble generator, water that collides with the microbubble generator inside the bottomed cylinder passes smoothly in a vortex-like pattern through the spiral passages (gaps) between the spirally arranged rectangular pillars while colliding with the rectangular pillars. This allows a large amount of microbubbles to be generated. Furthermore, the bottomed cylinder makes it easier to generate vortices along the spirally arranged rectangular pillars, allowing water to move smoothly to the outside of the bottomed cylinder. This more reliably prevents a drop in water pressure.

[0019] The present invention [7] includes a microbubble generating device according to any one of [1] to [6], wherein the plurality of through holes are formed so as to intersect with the radial and circumferential directions of the bottomed cylinder.

[0020] In this microbubble generator, the through-holes are formed so as to intersect the radial and circumferential directions, i.e., so as to penetrate obliquely when observed from the first direction, so that water that collides with the microbubble generator inside the bottomed cylinder can smoothly move along the oblique direction of the through-holes to the outside of the bottomed cylinder, thereby more reliably suppressing a drop in water pressure. [Effects of the Invention]

[0021] The microbubble generating device of the present invention can be made compact, and can generate a large amount of microbubbles and remove chlorine while suppressing a drop in water pressure. [Brief explanation of the drawings]

[0022] [Figure 1] 1 shows an exploded perspective view of a first embodiment. [Figure 2] 2 shows a perspective view of FIG. 1. [Figure 3] This shows the set of cylindrical housing and bottomed cylinder in Figure 1, with the upper left figure being a plan view, the right figure being an end view of the AA cross section of the left figure, and the lower left figure being an end view of the BB cross section of the right figure (however, the chlorine removal particles are omitted). [Figure 4] 2 shows the set of the cylindrical housing and the bottomed cylinder of FIG. [Figure 5] 2 shows the vortex generating member of FIG. 1, with the left figure being a plan view and the right figure being a perspective view. [Figure 6] The microbubble generator of FIG. 1 is shown in plan view on the left and in front view on the right. [Figure 7] 10A and 10B show a set of a cylindrical casing and a bottomed cylinder according to a second embodiment, the left figure being a perspective view seen from the upstream side, and the right figure being a perspective view seen from the downstream side. [Figure 8] 1 shows a cross-sectional end view of a second embodiment (the cross-section corresponds to the lower left view of FIG. 3, and the chlorine-removing particles are also omitted). DETAILED DESCRIPTION OF THE INVENTION

[0023] First Embodiment A microbubble generating device 1 according to a first embodiment will be described as an example of the present invention with reference to FIGS. 1 to 6. FIG.

[0024] The microbubble generator 1 (hereinafter simply referred to as "the device") of the first embodiment is a device that is placed in a water supply system, i.e., a flow path through which water flows, to generate a large amount of nanobubbles, which are microbubbles, in the water and remove chlorine from the water. As shown in FIGS. 1 to 3, the device comprises a cylindrical casing 2, a bottomed cylinder 3, a vortex generator 4, a microbubble generator 5, a chlorine remover 6, and a particle fall prevention member 7. In the first embodiment, the first direction is the water flow direction (the direction in which water flows from the water supply system toward the device 1), one side of the first direction is the upstream side, and the other side of the first direction is the downstream side. The direction perpendicular to the water flow direction is the radial direction or the circumferential direction.

[0025] The cylindrical housing 2 accommodates the bottomed cylinder 3, vortex generator 4, microbubble generator 5, chlorine removal unit 6, and particle fall prevention member 7 inside, and is a component for placement in the middle or end of a water supply system. The cylindrical housing 2 has a cylindrical shape extending in the water flow direction. In other words, the cylindrical housing 2 is a cylindrical housing. The interior of the cylindrical housing 2 forms a columnar shape. The cylindrical housing 2 is composed of a housing main body 8 and a housing lid 9, which are manufactured by joining these together using adhesives, thermal fusion, or the like. A circular through-hole 10 is formed in the bottom surface (top plate) located on the upstream side of the housing main body 8 in a plan view (when viewed from the upstream side toward the downstream side). A substantially annular first mounting portion 11 protruding toward the upstream side is formed on the bottom surface of the housing main body 8 so that it can be attached to a water supply system. The first mounting portion 11 is formed to surround the through hole 10, and the inner diameter of the first mounting portion 11 is formed slightly larger than the through hole 10. The outer surface of the first mounting portion 11 is formed with spiral irregularities to form an external thread. The inside of the first mounting portion 11 forms the water supply opening 12. The housing lid portion 9 is formed with a circular through hole 10 in a plan view. The through hole 14 in the housing lid portion 9 forms the discharge opening 14. The housing lid portion 9 is formed with a second mounting portion 13 that protrudes in a substantially annular shape toward the downstream side so that it can be attached to a water supply system. The second mounting portion 13 is formed to surround the through hole 14, and the inner diameter of the second mounting portion 13 is formed larger than the through hole 13. The inner surface of the second mounting portion 13 is formed with spiral irregularities to form an internal thread. The inner diameter of the housing 2 is, for example, 20 mm or more and 60 mm or less, preferably 30 mm or more and 50 mm or less, and the inner length in the upstream direction is, for example, 30 mm or more and 80 mm or less, preferably 45 mm or more and 65 mm or less.

[0026] The bottomed cylinder 3 separates the microbubble generator 5 and the chlorine removal section 6. In other words, it prevents the chlorine removal particles 26 from coming into contact with the microbubble generator 5. As shown in FIG. 4 , the bottomed cylinder 3 is cylindrical and extends in the water flow direction. It has an opening (cylindrical opening) 15 on the upstream side and a bottom surface 16 on the downstream side. The bottomed cylinder 3 is disposed inside the cylindrical housing 2, and the cylindrical opening 15 is disposed so as to open toward the upstream side (i.e., the water supply opening 12). Specifically, the bottomed cylinder 3 is fixed to the downstream side of the bottom of the housing main body 8 so that the cylindrical opening 15 surrounds or overlaps the through-hole 10 of the housing main body 8 in a plan view. The shape of the cylindrical opening 15 matches the shape of the through-hole 10 of the housing main body 8, and they are integrally continuous. As a result, the cylindrical opening 15 of the bottomed cylinder 3 communicates with the water supply opening 12. The bottom surface 16 of the bottomed cylinder 3 is located at a distance from the discharge opening 14 in the water flow direction, and specifically, is located midway between the through hole 10 of the housing main body 8 and the discharge opening 14.

[0027] The sidewall 17, which is the side surface of the bottomed cylinder 3, is disposed radially apart from the cylindrical housing 2. The sidewall 17 is formed with a plurality of (10) through-holes 18 penetrating the sidewall 17 in the radial direction. Each through-hole 18 has the same shape and is provided at equal intervals in the circumferential direction. Each through-hole 18 is formed linearly (slit-like) along the water flow direction from the middle of the sidewall 17 in the water flow direction to the bottom surface 16. The circumferential length (width) of each through-hole 18 is smaller than the average particle diameter of the chlorine removal particles 26 described below. To ensure a sufficient volume for the chlorine removal unit 6 outside the microbubble generator 5 and ensure more reliable chlorine removal, the diameter of the bottomed cylinder 3 at its outer surface is preferably half or less of the diameter of the cylindrical housing 2 at its inner surface. The bottomed cylinder 3 can be manufactured by integral molding with the housing main body 8. The inner diameter of the bottomed cylinder 3 is, for example, 5 mm or more and 20 mm or less, preferably 10 mm or more and 15 mm or less, and the inner length in the upstream direction is, for example, 15 mm or more and 40 mm or less, preferably 20 mm or more and 30 mm or less.

[0028] The vortex generator 4 is a component that swirls water flowing from the water supply system opening 12 and guides the vortex toward the micro-bubble generator 5 located downstream. The vortex generator 4 is disposed inside the first mounting portion 11 of the housing main body 8. As shown in FIG. 5 , the vortex generator 4 includes a helical portion 19. The helical portion 19 is a plate-like component that is generally annular in plan view and is formed to rotate counterclockwise as it moves downstream. That is, it is formed to slope downstream as it moves counterclockwise. An opening 20 is formed in the circumferential direction between one circumferential edge of the helical portion 19 (e.g., a clockwise edge; one of the radially extending edges) and the other circumferential edge of another helical plate adjacent to that helical plate (e.g., a counterclockwise edge; one of the radially extending edges). The opening 20 serves as an entrance / exit for water to pass through when it flows into the vortex generator 4 and flows out to the micro-bubble generator 5. As a result, a vortex-like water current that rotates counterclockwise as it moves downstream is introduced into the microbubble generator 5 through the opening 20. A plurality of triangular prism-shaped protrusions 21 extending in the radial direction are formed on the upstream side (the surface on one side in the first direction) and downstream side (the surface on the other side in the first direction) of the spiral portion 19 to make it easier to generate nanobubbles.

[0029] The micro-bubble generator 5 generates a large amount of nanobubbles in the water flowing from the vortex generator 4. The micro-bubble generator 5 is disposed inside the bottomed cylinder 3. The micro-bubble generator 5 integrally comprises a shaft 22 and a plurality of rectangular pillars 23.

[0030] The shaft 22 is a part that supports a plurality of rectangular columns 23. The shaft 22 is a cylindrical shaft that extends in the water flow direction (axial direction). The upstream end of the shaft 22 contacts the vortex generator 4.

[0031] The multiple rectangular pillars 23 are components that reduce the size of bubbles contained in the water flowing from the vortex generator 4 to nanobubbles. The multiple rectangular pillars 23 are formed so as to protrude radially outward from the circumferential side surface of the shaft 22. The multiple rectangular pillars 23 are identical in shape and are substantially parallelepipeds. That is, the rectangular pillars 23 are quadrangular pillars having a substantially parallelogram shape in side view (when viewed from the radially outer side toward the radially inner side). In a cross-sectional view perpendicular to the water flow direction, they have a rectangular shape that is elongated in the radial direction, and are formed so that the rectangular shape rotates in the circumferential direction of the shaft 22 (specifically, counterclockwise) as they move downstream. The outer peripheral edge of the rectangular pillars 23 is curved so as to be convex radially outward in plan view. That is, the radially outer surface of the rectangular pillars 23 (the surface forming the parallelogram shape) is formed in an arc shape.

[0032] A plurality (30) of rectangular pillars 23 are provided on the circumferential side surface of the shaft 22, and are regularly arranged from the upstream end to the downstream end of the shaft 22. Specifically, a plurality (five) of rectangular pillars protruding radially from the shaft 22 constitute a set of radial rectangular pillar groups 24, and a plurality (six sets) of radial rectangular pillar groups 24 are arranged at intervals in the water flow direction. The plurality of sets of radial rectangular pillar groups 24 are arranged at equal intervals in the water flow direction and so as to rotate in the circumferential direction (i.e., spirally). That is, as shown in FIG. 6, the plurality of rectangular pillars 23 are arranged on the side surface of the shaft 22 so as to follow a spiral line Y whose spiral axis X is the axial direction of the shaft 22 (particularly, a straight line in the axial direction passing through the center of the shaft 22). The plurality of rectangular pillars 23 are arranged in a spiral with a gentle spiral angle θ (e.g., 5 degrees or more and 45 degrees or less). In terms of the positional relationship between two adjacent rectangular pillars 23 spaced apart in the axial direction, one rectangular pillar 23 and the other rectangular pillar 23 overlap each other in a plan view and are slightly offset in the circumferential direction. That is, the other rectangular pillar 23 arranged on the other axial side is slightly offset counterclockwise relative to the one rectangular pillar 23 located on one axial side. There are multiple sets of such spirally arranged rectangular pillar groups. That is, in a side view, multiple (six) rectangular pillars 23 adjacent to each other in the axial direction form a single row of spiral rectangular pillar groups 25, and the spiral rectangular pillar groups 25 are arranged in multiple rows (five rows) at equal intervals in the circumferential direction. As a result, multiple (five) spiral flow paths are defined between the spiral rectangular pillar groups 25 while arranging the numerous rectangular pillars 23.

[0033] The chlorine removal unit 6 removes chlorine from water that has passed through the through-holes 18 of the bottomed cylinder 3. The chlorine removal unit 6 is disposed inside the cylindrical casing 2 and outside the bottomed cylinder 3. In other words, the chlorine removal unit 6 is disposed to the side and downstream of the micro-bubble generator 5.

[0034] The chlorine removing section 6 includes a large amount of chlorine removing particles 26. That is, the chlorine removing section 6 is substantially composed of only a plurality of chlorine removing particles 26. Specifically, the chlorine removing particles 26 fill the entire space inside the cylindrical casing 2 and outside the bottomed cylinder 3.

[0035] Examples of the chlorine-removing particles 26 include calcium sulfite particles and activated carbon particles, with calcium sulfite being preferred. This allows for more reliable chlorine removal. Furthermore, when calcium sulfite particles are exposed to water for a long period of time, their surfaces are denatured (for example, they turn pale blue), reducing their chlorine-removing function. However, the device 1 causes water that generates a large amount of nanobubbles to collide with the calcium sulfite particles. This prevents the particle surfaces from denaturing, allowing the chlorine-removing function to be maintained for a long period of time.

[0036] The average particle diameter of the chlorine-removing particles 26 is, for example, 1 mm or more, preferably 2 mm or more, and, for example, 5 mm or less, preferably 3 mm or less. This increases the surface area of ​​the microbubble water that comes into contact with the chlorine-removing particles, thereby improving the chlorine-removing effect. Furthermore, the chlorine-removing particles 26 are prevented from dissolving in water, becoming smaller, and flowing out of the discharge opening 14, so the chlorine-removing effect can be maintained for a long period of time.

[0037] The particle fall prevention member 7 allows water to pass through while preventing the chlorine removal particles 26 from being discharged through the discharge opening 14. The particle fall prevention member 7 is disposed on the housing lid 9 so as to cover the discharge opening 14. The particle fall prevention member 7 is a mesh member with a mesh size finer than the particle diameter of the chlorine removal particles 26.

[0038] The cylindrical housing 2, the bottomed cylinder 3, the vortex generator 4, the microbubble generator 5 and the particle fall prevention member 7 may each be made of a resin such as polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), ethylene vinyl acetate copolymer (EVA), polyvinyl chloride (PVC), polyvinylidene chloride (PVDC), polyacetal (POM), silicone rubber or ABS resin, or a metal such as aluminum, stainless steel or brass.

[0039] The device 1 is used by being placed in the middle or at the end of a water supply system. Examples include the end of a faucet pipe (tap pipe) located in a kitchen, bathroom, outdoors, etc., between such a faucet pipe and a hose, or in the middle of a water pipe or hose. More specific uses include the end of a kitchen faucet pipe, between a laundry hose and a washing machine, or between a shower head and a shower hose. It is particularly suitable for use as a device to be attached between a shower head and a shower hose. In this case, the device can be attached by threading the first attachment portion 11 of the cylindrical housing 2 onto a component located upstream of the water flow (e.g., a shower hose, a washing machine, etc.) and threading the second attachment portion 13 of the cylindrical housing 2 onto a component located downstream of the water flow (e.g., a shower head, a washing machine, etc.).

[0040] This device 1 can be miniaturized, generates a large amount of nanobubbles, and removes chlorine while suppressing a drop in water pressure. Specifically, water flowing from the upstream side of the water supply system passes through the water supply opening 12 of the cylindrical casing 2, collides with the vortex generating member 4, and becomes a vortex-like water flow, moving downstream. The vortex-like water collides with the multiple rectangular pillars 23 of the microbubble generator 5 in multiple stages within the bottomed cylinder 3. Because the rectangular pillars 23 are arranged in a spiral and are surrounded by the bottomed cylinder 3, the vortex-like water moves more smoothly downstream in a vortex shape and comes into contact with the multiple rectangular pillars 23 with force. This causes bubbles in the water to be broken down into nanobubbles (microbubbles with a diameter of 1000 nm or less). The vortex-like water, containing a large amount of nanobubbles, then diffuses through the through-holes 18 of the bottomed cylinder 3 to the chlorine removal unit 6 on the side. In this case, because the chlorine removal section 6 is filled with granular chlorine removal particles, the swirling water can move smoothly through the gaps between the chlorine removal particles while coming into contact with the chlorine removal particles, which have a large surface area. This allows for efficient chlorine removal while suppressing a drop in water pressure. In addition, because the microbubble generator 5 and the chlorine removal section 6 overlap in the water flow direction and the device 1 uses chlorine removal particles with a large surface area and high chlorine removal efficiency, the length in the water flow direction can be shortened, allowing the device to maintain a compact size.

[0041] Furthermore, according to this device 1, the multiple through-holes 18 are formed to extend in the water flow direction, and the circumferential length of the through-holes 18 is smaller than the average particle diameter of the multiple chlorine-removing particles 26. Therefore, water that collides with the microbubble generator 5 can be efficiently moved to the outside of the bottomed cylinder 3, i.e., to the chlorine removal section 6. This further suppresses a decrease in water pressure. Furthermore, since the chlorine-removing particles 26 cannot pass through the through-holes 18 of the bottomed cylinder 3 and enter its interior (particularly the water flow paths between the rectangular columns 23), the generation of nanobubbles by the microbubble generator 5 inside the bottomed cylinder 3 is not hindered, and a large amount of nanobubbles can be generated more reliably.

[0042] Furthermore, according to this device 1, the volume of the chlorine removing portion 6 is larger than the volume of the bottomed cylinder 3. This makes it possible to further improve the effect of removing chlorine.

[0043] Second Embodiment 7 and 8, a microbubble generator 1 according to a second embodiment of the present invention will be described as an example. The same components as those in the first embodiment are designated by the same reference numerals, and a description thereof will be omitted. The device 1 according to the second embodiment includes a cylindrical housing 2, a bottomed cylinder 3, a vortex generator 4, a microbubble generator 5, a chlorine remover 6, and a particle fall prevention member 7.

[0044] In the second embodiment, the side wall 17 of the bottomed cylinder 3 has a plurality (10) of through holes 18. The through holes 18 are identical in shape and are arranged at equal intervals in the circumferential direction. Each through hole 18 is linearly (slit-like) formed along the water flow direction from the middle of the side wall 17 in the water flow direction to the bottom surface 16. In a cross-sectional view perpendicular to the underwater direction, each through hole 18 is formed so as to intersect with the radial and circumferential directions of the bottomed cylinder 31. That is, the through holes 18 are formed so as to intersect (be inclined) with respect to a straight line (center line) drawn radially from the center of the bottom surface 16. In other words, in a cross-sectional view, the same plurality (10) of through holes 18 are arranged at equal intervals in the circumferential direction, and each of the through holes is formed so that one end on the counterclockwise side (or clockwise side) is inclined inward in the circumferential direction at the same angle. In particular, the through holes are inclined in a direction that facilitates the passage of vortex-like water flow through the bottomed cylinder 3. Specifically, when a counterclockwise vortex is generated, the through-holes 18 are formed so that the outer openings of the through-holes 18 are tilted more counterclockwise than the inner openings in a planar cross-sectional view.

[0045] The device 1 of the second embodiment also achieves the same effects as the device 1 of the first embodiment. The device of the second embodiment is preferable. When water that has collided with the micro-bubble generator 5 passes through the through-holes 18 of the bottomed cylinder 3 and moves to the chlorine removal section 6, it is more likely to pass through the through-holes 18 formed in the intersecting direction, which further suppresses a drop in water pressure.

[0046] <Other embodiments> Although not shown, the instrument 1 of the first embodiment and the instrument 1 of the second embodiment do not necessarily have to include the vortex generator 4. From the viewpoint of more reliably exerting the function of the microbubble generator 5 and more reliably generating a large amount of nanobubbles, it is preferable to include the vortex generator 4.

[0047] Although not shown, if the device 1 is attached only to the end of the water supply system, the device 1 of the first embodiment and the device 1 of the second embodiment do not need to be provided with a second attachment portion 13 for attachment to the downstream side of the water supply system. [Explanation of symbols]

[0048] 1 Microbubble generating device 2 Cylindrical housing 3 Bottomed cylinder 4 Vortex generator 5 Microbubble generator 6 Chlorine removal unit 7 Particle fall prevention member 8 Housing main body 9 Housing cover 10 Through hole in housing main body 11 first mounting portion 12 water supply opening 13 Second mounting portion 14 Through hole (discharge opening) in housing lid portion 15 Cylindrical opening 16 Bottom surface 17 Side wall 18 Through hole of bottomed cylinder 19 Spiral section 20 Opening 21 protrusion 22 axis 23 Prism 24 Radial Prism Group 25 Spiral prisms 26 Chlorine removal particles

Claims

1. a cylindrical housing extending in a first direction and having a water supply opening on one side in the first direction and a water discharge opening on the other side in the first direction; a bottomed cylinder disposed inside the cylindrical housing and extending in a first direction; a microbubble generator disposed inside the bottomed cylinder; a chlorine removal unit disposed inside the cylindrical housing and outside the bottomed cylinder; Equipped with the bottomed cylinder has an opening at one end of the bottomed cylinder in a first direction that communicates with the water supply opening, the bottomed cylinder has a bottom surface at an end on the other side in the first direction of the bottomed cylinder, the bottom surface being spaced apart from the discharge opening; A plurality of through holes are formed in the side surface of the bottomed cylinder, the microbubble generator comprises a shaft extending in a first direction and a plurality of rectangular pillars formed on a side surface of the shaft; The microbubble generating device is characterized in that the chlorine removal section comprises a plurality of chlorine removal particles.

2. 2. The microbubble generator according to claim 1, wherein the average particle diameter of the plurality of chlorine-removing particles is 1 mm or more and 5 mm or less.

3. The microbubble generator according to claim 1, wherein the chlorine-removing particles are calcium sulfite particles.

4. 2. The microbubble generator according to claim 1, wherein the volume of the chlorine removing section is larger than the volume of the bottomed cylinder.

5. The plurality of through holes are formed to extend in a first direction, 2. The microbubble generator according to claim 1, wherein the circumferential length of the plurality of through holes is smaller than the average particle diameter of the plurality of chlorine-removing particles.

6. The microbubble generator according to claim 1, wherein the plurality of rectangular pillars are arranged in a spiral pattern.

7. 2. The microbubble generator according to claim 1, wherein the plurality of through holes are formed so as to intersect with the radial and circumferential directions of the bottomed cylinder.

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