JP6974046B2 - Mixing bubble generator - Google Patents

Description

The present invention relates to a mixing bubble generator.

A cleaning device provided with a faucet, a foam shower, or the like for injecting a fluid mixed with air bubbles into an object to be cleaned is known.
For example, Patent Document 1 describes a washer that is provided with two air introduction paths and that forms an air-water mixed stream having different bubble diameters by switching the system of the air introduction path with an operation lever.

Utility Model Registration No. 3190442 Gazette

However, the above-mentioned conventional techniques have the following problems.
According to the technique described in Patent Document 1, it is necessary to select the foam diameter by the operation lever when performing cleaning. Therefore, the user has to switch the operation lever according to the dirt of the object to be cleaned, and there is a problem that the workability of cleaning is inferior.
According to Patent Document 1, a bubble having a bubble diameter of "0.18 to 0.68 mm""overcomes the viscosity of water and vigorously vibrates, and its vibration energy is very strong", and a bubble having a bubble diameter of "10 to 50 μ". It is stated that the bubbles are "trapped and solidified by the viscosity of water, and in water, the vibration and levitation action that are the characteristics of the bubbles are suppressed and the bubbles become almost stationary".
On the other hand, Patent Document 1 describes "the purpose of removing stains and foreign substances adhering to the surface for cleaning foods such as vegetables and fruits". However, in the above description of Patent Document 1, it is unclear what kind of dirt and foreign matter are washed by the air-water mixed flow having a particularly small diameter of bubbles.
For this reason, the user needs to switch the operation lever by trial and error every time the washing is performed, which makes the washing device inconvenient to use.

Furthermore, when the present inventor manufactured a washer based on the information described in Patent Document 1 and conducted various experiments, it is extremely difficult to stably produce the above-mentioned two types of foam diameters by switching the operation lever. It turned out to be difficult.

As described above, there is a strong demand for a cleaning device capable of stably and easily forming a gas-liquid mixed flow containing bubbles having a high cleaning effect. As a result of diligent studies by the present inventor, it has been found that the gas-liquid mixed stream having a high cleaning effect is a gas-liquid mixed stream containing at least two types of bubbles having different cleaning characteristics due to different bubble diameters. be.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a mixed bubble generator capable of stably and easily forming a gas-liquid mixed flow containing bubbles having a high cleaning effect. And.

In order to solve the above problems, the mixing bubble generator according to the embodiment of the present invention is airtightly connected to the liquid inlet for flowing the pressurized liquid and the liquid inlet, and flows in from the liquid inlet. A rotating flow forming path that forms a rotating flow that rotates around the first axis by the liquid is airtightly connected to the rotating flow forming path to accelerate the rotating flow, and the rotating flow is combined with the first axis. Facing a first nozzle portion to inject from a first injection port provided coaxially, a gas inlet into which a liquid flows, and a negative pressure forming region due to the rotational flow accelerated by the first nozzle portion. The gas introduction chamber for airtightly connecting the gas outlets arranged in the air and the gas-liquid mixed flow in which the gas flowing out from the gas outlet is mixed with the rotating flow so as to collide with each other. A dispersion member arranged so as to face the first injection port and dispersing the gas-liquid mixed flow in the radial direction with respect to the first axis, and the gas-liquid mixed flow dispersed by the dispersion member to the outside. A second nozzle portion having a second injection port for injection is provided, and the minimum value of the inner diameter of the gas inlet is 0.20 mm or more and 0.30 mm or less, and the liquid is injected from the second nozzle portion. It was and have a foam diameter distribution bimodal said gas-liquid mixed flow, the bubble size distribution, first in the first bubble diameter that a stable bubble diameter is maintained in a state trapped in the liquid It has a predominant peak of 1 and a second predominant peak in a second bubble diameter having a diameter larger than that of the first bubble diameter and having a larger sonic vibration energy, and the first bubble diameter. Is 5 μm or more and 50 μm or less, and the second bubble diameter is 0.18 mm or more and 0.68 mm or less .

In the mixing bubble generator of the above aspect, the flow path of the liquid between the liquid inlet and the rotary flow forming path revolves around the first axis more than once in a plurality of spirals. It may be formed in.

In the mixed bubble generator of the above aspect, the bubble diameter distribution is the sum of the number of bubbles having a bubble diameter of 5 μm or more and 50 μm or less and the number of bubbles having a bubble diameter of 0.18 mm or more and 0.68 mm or less. , 80% or more of the whole may be occupied.

In the mixing bubble generator of the above aspect, the flow path cross-sectional area of the liquid flow path between the liquid inflow port and the rotary flow forming path is the flow path cross-sectional area at the end near the liquid inflow port. In comparison, the cross-sectional area of the flow path at the portion facing the inlet to the rotary flow forming path may be smaller.

In the mixing bubble generator of the above aspect, the rotary flow forming path is provided with a plurality of inflow openings for flowing the liquid flowing from the liquid inlet at different positions in the circumferential direction with respect to the first axis. May be good.

The mixed bubble generator of the present invention can stably and easily form a gas-liquid mixed flow containing bubbles having a high cleaning effect.

It is a schematic plan view which shows an example of the mixing bubble generator of 1st Embodiment of this invention. It is a schematic bottom view which shows an example of the mixing bubble generator of 1st Embodiment of this invention. FIG. 3 is a cross-sectional view taken along the line AA in FIG. It is a schematic bottom view which shows an example of the rotation flow formation path in the mixing bubble generator of 1st Embodiment of this invention. It is a schematic vertical sectional view which shows an example of the plug member of the gas introduction chamber in the mixing bubble generator of 1st Embodiment of this invention. It is a schematic partial sectional view which shows an example of the 2nd nozzle part in the mixing bubble generator of 1st Embodiment of this invention. It is a schematic vertical sectional view explaining the flow of gas and liquid in the mixing bubble generator of 1st Embodiment of this invention. It is a schematic graph which shows an example of the bubble diameter distribution of the gas-liquid mixed flow generated by the mixing bubble generator of the 1st Embodiment of this invention. It is a schematic diagram explaining the action of the washing water containing the type 1 bubble. It is a schematic diagram explaining the action of the gas-liquid mixed flow in the mixing bubble generator of the 1st Embodiment of this invention. It is a schematic vertical sectional view which shows an example of the mixing bubble generator of the 2nd Embodiment of this invention. It is a B view in FIG.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In all the drawings, even if the embodiments are different, the same or corresponding members are designated by the same reference numerals, and common description will be omitted.

[First Embodiment]
The mixed bubble generator of the first embodiment of the present invention will be described.
FIG. 1 is a schematic plan view showing an example of a mixed bubble generator according to the first embodiment of the present invention. FIG. 2 is a schematic bottom view showing an example of the mixing bubble generator according to the first embodiment of the present invention. FIG. 3 is a cross-sectional view taken along the line AA in FIG. FIG. 4 is a schematic bottom view showing an example of a rotating flow forming path in the mixing bubble generator according to the first embodiment of the present invention. FIG. 5 is a schematic vertical sectional view showing an example of a plug member of a gas introduction chamber in the mixing bubble generator according to the first embodiment of the present invention. FIG. 6 is a schematic partial cross-sectional view showing an example of a second nozzle portion in the mixing bubble generator according to the first embodiment of the present invention.
Since each drawing is a schematic drawing, the shape and dimensions are exaggerated (the same applies to the following drawings).

The shower head 1 (mixing bubble generator) of the present embodiment shown in FIG. 1 is connected to an appropriate pressurized liquid supply source such as a water pipe, so that the type 1 bubble and the type 2 bubble described later will be described. Inject a gas-liquid mixed stream containing. The shower head 1 may be installed in a bathroom or the like, or may be used by connecting to an appropriate cleaning device.
The liquid component and the gas component in the gas-liquid mixed flow formed by the shower head 1 are not particularly limited. In the following, as an example, the case where the liquid component is water and the gas component is air will be described.

As shown in FIG. 1, the shower head 1 includes a main body portion 2 and an opening plug 3.
The main body 2 includes a head portion 2A that injects a gas-liquid mixed flow, and a rod-shaped grip portion 2B that is smoothly connected to the head portion 2A.
The head portion 2A is formed in a dome shape having a substantially circular shape in a plan view, and an opening plug 3 is fixed to the central portion. As shown in the lower surface view in FIG. 2, an outlet cap 4 described later is attached to the lower surface side of the head portion 2A facing the opening plug 3.

As shown in FIG. 1, a water injection pipeline 2a through _{which water W 0 (liquid), which is a pressurized liquid, flows is formed inside the grip portion 2B.} As the water W ₀ , for example, tap water, pure water, a cleaning liquid containing a cleaning agent component, or the like may be used.
In the present embodiment, the water injection pipeline 2a is connected to a hose (not shown) connected to an end portion of the grip portion 2B opposite to the head portion 2A. The hose (not shown) is connected to the water pipe via a valve that can be opened and closed by an appropriate operating lever, for example. Therefore, in the following, as an example, water W ₀ will be described as tap water. The water W ₀ may be hot water or cold water.

As shown in FIG. 3 showing the internal structure of the shower head 1, the shower head 1 further includes a swivel cylinder 5, a partition plate 7, and a dispersion plate 8 (dispersion member).

Hereinafter, when each component of the shower head 1 is described, it will be described based on the arrangement in the assembled state shown in FIG. 3 unless otherwise specified.
Further, in the explanation of the positional relationship of each constituent member, the XYZ Cartesian coordinate system shown in FIG. 3 may be referred to. In the XYZ Cartesian coordinate system, the Z axis is parallel to the axis extending from the center of the outlet cap 4, which will be described later, toward the opening plug 3 (from the lower side to the upper side in the drawing). The Y-axis is an axis that is orthogonal to the Z-axis and extends from the grip portion 2B toward the head portion 2A (from the left side to the right side in the drawing). The X-axis is an axis line orthogonal to the Z-axis and the Y-axis and extending from the front side of the paper surface toward the back side of the paper surface. The positive direction in each axis is the extension direction of each axis as described above. The negative direction on each axis is the opposite of the positive direction.

The detailed configuration of the main body 2 will be described.
FIG. 4 shows a bottom view of the main body 2 in which the swivel cylinder 5, which will be described later, is assembled, as viewed in the positive direction of the Z axis. As shown in FIG. 4, on the outer peripheral portion of the head portion 2A, a cylindrical portion 2i centered on the central axis O (first axis) protrudes in the negative direction of the Z axis.
An uneven fitting portion 2s for fitting with the outlet cap 4, which will be described later, is formed on the outer peripheral portion of the cylindrical portion 2i. For example, the uneven fitting portion 2s may be composed of a male screw or the like.
A stepped locking portion 2r is formed on the inner peripheral portion of the cylindrical portion 2i over the entire circumference. The locking portion 2r is formed of a plane orthogonal to the central axis O in order to lock the outer peripheral portion of the partition plate 7 (see FIG. 3) described later with the rubber packing 11 (see FIG. 3) described later. ..
The locking portion 2r is provided with a plurality of tap holes 2f extending in the positive direction of the Z axis in order to fix the partition plate 7 described later with a tapping screw. The number of tap holes 2f is not particularly limited, but in the example shown in FIG. 4, the tap holes 2f are formed at four locations on the circumference centered on the central axis O.
As shown in FIG. 3, on the outer peripheral portion of the cylindrical portion 2i, on the Z-axis positive direction side of the uneven fitting portion 2s, a stepped O-ring mounting portion 2t protruding outward in the radial direction is formed over the entire circumference. ..

An O-ring 6B is attached to the O-ring attachment portion 2t.
The O-ring 6B is a sealing member that airtightly and liquid-tightly seals the gap between the main body portion 2 and the outlet cap 4 by contacting the O-ring mounting portion 2t and the outlet cap 4 described later.
As the material of the O-ring 6B, a rubber material that does not hinder contact with the main body 2 and the outlet cap 4 is used.

Inside the cylindrical portion 2i and the locking portion 2r, an inflow port portion 2c (liquid inflow port), which is a hole extending in the Z-axis direction, is formed at a portion facing the water injection pipeline 2a. A water injection pipe 2a communicates with the end of the inflow port 2c on the positive direction side of the Z axis.
In the inflow port portion 2c, the inner peripheral surface on the Y-axis positive direction side (right side in the drawing of FIG. 3) is formed by the outer peripheral surface of the spiral partition wall 2b described later.
As shown in FIG. 4, in the inflow port portion 2c, the inner peripheral surface on the negative direction side of the X axis (upper side in the drawing of FIG. 4) is formed by the side wall portion 2m, and the inner peripheral surface on the positive direction side of the X axis is formed by the side wall portion 2k. , Each is formed.
As shown in FIG. 3, the heights of the spiral partition wall 2b, which will be described later, and the side wall portions 2k and 2m from the bottom surface portion 2h are the same.
A rectangular opening 2n extending from the bottom surface 2h to the tip of the side wall 2k penetrates the side wall 2k in the X-axis direction.

As shown in FIG. 3, in the head portion 2A, a hole portion having a bottom surface portion 2h as a bottom surface is formed inside the inner peripheral surface 2j of the cylindrical portion 2i. At the center of the bottom surface portion 2h, a swivel cylinder 5 having a cylindrical outer shape is fitted in a recess 2p formed in the bottom surface portion 2h. At the bottom of the recess 2p, an engaging hole 2q for positioning the swivel cylinder 5 described later around the central axis O is provided.
At the center of the recess 2p, a mounting hole 2g for fitting and fixing the opening plug 3 described later is formed.
On the outer peripheral side of the swivel cylinder 5, a spiral partition wall 2b extending from the bottom surface portion 2h in the negative direction of the Z axis is provided.
When viewed in the positive direction of the Z axis as shown in FIG. 4, the spiral partition wall 2b orbits counterclockwise in the figure around the central axis O from the outer peripheral end portion P1 connected to the side wall portion 2k at the inflow port portion 2c. It extends in a spiral shape. The number of laps of the spiral partition wall 2b is not particularly limited. The number of laps may be one lap or less, or two or more laps. In the present embodiment, the number of laps of the spiral partition wall 2b is less than two laps as an example.
The position of the end portion of the spiral partition wall 2b from the bottom surface portion 2h in the negative direction of the Z axis is located on the same plane orthogonal to the central axis O.

The outer peripheral end portion P1 of the spiral partition wall 2b is connected to the end edge on the opening 2n side in the side wall portion 2k. The radius of the spiral partition wall 2b is gradually reduced from the first intermediate portion P2, which is a position that is rotated counterclockwise by about 3/4 of the circumference along the circumference centered on the central axis O. There is. The spiral partition wall 2b is connected to the end of the side wall portion 2m in the positive direction of the Y axis at the second intermediate portion P3. The spiral partition wall 2b extends from the second intermediate portion P3 along the circumference centered on the central axis O so as to further rotate clockwise in the figure. As a result, the spiral partition wall 2b extending between the side wall portions 2m and 2k forms the side surface of the inlet portion 2c on the positive direction side of the Y axis.
The above-mentioned opening 2n is formed between the end portion of the side wall portion 2k on the positive direction side of the Y axis and the spiral partition wall 2b in the third intermediate portion P4.
The spiral partition wall 2b is further formed on the outer peripheral surface of the swirl cylinder 5 at the fourth intermediate portion P5, which is a position in which the spiral partition wall 2b is rotated counterclockwise in the figure by about 3/4 turn along the circumference centered on the central axis O. It is bent toward 5 m. The inner peripheral end portion P6 of the spiral partition wall 2b is in contact with the outer peripheral surface 5m of the swirl cylinder 5 without a gap.

Such a spiral partition wall 2b forms a first flow path 2d and a second flow path 2e extending in a continuous spiral shape when viewed in the positive direction of the Z axis. The first flow path 2d and the second flow path 2e form a liquid flow path between the liquid inflow port and the rotary flow forming path described later.
The first flow path 2d has a spiral partition wall 2b from the outer peripheral end portion P1 to the second intermediate portion P3 and a spiral partition wall 2b from the third intermediate portion P4 to the outer peripheral end portion P6 on the bottom surface portion 2h. , Is sandwiched between them.
The second flow path 2e is composed of a spiral partition wall 2b from the second intermediate portion P3 to the outer peripheral end portion P6 on the bottom surface portion 2h, and an outer peripheral surface 5m of the swivel cylinder 5.
Both the first flow path 2d and the second flow path 2e are formed of a groove portion that opens in the negative direction of the Z axis.
In the present embodiment, the flow path cross-sectional area in the second flow path 2e is narrower than the flow path cross-sectional area in the first flow path 2d. Specifically, the groove width of the second flow path 2e is narrower than the groove width of the first flow path 2d. Therefore, in the flow path formed by the first flow path 2d and the second flow path 2e, the rotary flow forming path to be described later is compared with the flow path cross-sectional area of the end portion (opening portion 2n) closer to the inflow port portion 2c. The flow path cross-sectional area of the second end facing the inlet (inflow opening 5b, 5b described later) is smaller.
Here, the flow path cross-sectional area is a cross-sectional area in a cross section orthogonal to the flow direction of the liquid.

The material of the main body 2 is not particularly limited, but in the present embodiment, a synthetic resin material is used as an example. The type of synthetic resin material is not particularly limited.

Next, the configuration of the swivel cylinder 5 will be described. As shown in FIG. 3, the swivel cylinder 5 includes a bottom surface portion 5g, an outer cylinder portion 5a, and an inner cylinder portion 5d.
The bottom surface portion 5 g is formed in the shape of a disk through which a circular hole penetrates in the center. On one surface of the bottom surface portion 5g, a fixing pin 5e for positioning a fixing position around the central axis O axis with respect to the main body portion 2 projects.
The outer cylinder portion 5a is a cylindrical member extending from the outer edge of the bottom surface portion 5g along the central axis of the bottom surface portion 5g in the direction opposite to the protruding direction of the fixing pin 5e.
As shown in FIG. 4, the outer cylinder portion 5a is formed with inflow openings 5b and 5c having through holes penetrating at positions that are 180 ° rotationally symmetric with respect to the central axis of the outer cylinder portion 5a.
As shown in FIG. 3, the inner cylinder portion 5d is a cylindrical member extending from the inner edge of the circular hole of the bottom surface portion 5g along the central axis of the bottom surface portion 5g in the same direction as the outer cylinder portion 5a. Therefore, the outer diameter of the inner cylinder portion 5d is smaller than the inner diameter of the outer cylinder portion 5a. The height of the inner cylinder portion 5d from the bottom surface portion 5g is higher than the height of the outer cylinder portion 5a from the bottom surface portion 5g. Therefore, the tip portion of the inner cylinder portion 5d projects outward from the tip surface 5n of the outer cylinder portion 5a in the axial direction.
Inside the inner cylinder portion 5d, a hollow portion 5h (gas introduction chamber) is formed so as to penetrate the entire swivel cylinder 5 along the central axis of the swivel cylinder 5.

As shown in FIG. 3, the end portion of the swivel cylinder 5 on the Z-axis positive direction side is fitted into the recess 2p of the main body portion 2 with the O-ring 6A sandwiched between the bottom surface portion 5g and the recess 2p. ing. The fixing pin 5e of the swivel cylinder 5 is engaged with the engaging hole 2q in the main body 2. As a result, the swivel cylinder 5 is positioned around the central axis O.
The O-ring 6A is a sealing member that airtightly and liquid-tightly seals the gap between the main body portion 2 and the bottom surface portion 5g by contacting the main body portion 2 and the bottom surface portion 5g.
As used herein, "airtight and liquidtight" means a positive or negative pressure that can be generated by a liquid flow, a gas flow, and a gas-liquid mixed flow that flows inside the mixed bubble generator when the mixed bubble generator is used. It means that it is airtight and liquidtight in the range of.
As the material of the O-ring 6A, a rubber material that does not hinder contact with the main body 2 and the swivel cylinder 5 is used.

In the assembled state in which the swivel cylinder 5 is positioned by the engaging hole 2q and fitted into the recess 2p, the central axis of the swivel cylinder 5 is coaxial with the central axis O. Further, the tip surface 5n of the outer cylinder portion 5a is located on the same plane as the tip portion of the spiral partition wall 2b.
The positions of the inflow openings 5b and 5c in the axial direction of the swivel cylinder 5 are on the Z-axis positive direction side of the bottom surface portion 2h in the assembled state and the bottom surface portion 2h as shown in FIG. It is a position near.
As shown in FIG. 4, the position of the inflow opening 5b in the circumferential direction with respect to the central axis O is positioned so as to open at the end of the second flow path 2e in the circumferential direction with respect to the central axis O in the assembled state. The position of the inflow opening 5c in the circumferential direction with respect to the central axis O is substantially central to the second flow path 2e in the circumferential direction with respect to the central axis O.
Inlet opening 5b, 5c through direction of, as water W ₀ is so easy to flow into the interior of the outer tubular portion 5a, toward the inner peripheral surface from the outer peripheral surface of the outer tubular portion 5a, with respect to the radial direction, the counterclockwise It is said to be inclined in the clockwise direction. Therefore, in the second flow path 2e, it is possible to water W ₀ to be rotated in the counterclockwise flows resistance less inlet opening 5b, the 5c.

Next, the configuration of the opening plug 3 will be described.
As shown in FIG. 5, the opening plug 3 includes a holder 3A, an air supply pipe 3B, and a dustproof filter 9.

The holder 3A is a member formed in a cylindrical shape as a whole in order to hold the air supply pipe 3B and the dustproof filter 9. The holder 3A includes a disk portion 3a and a shaft portion 3b in this order along the axial direction.
At the center of the disk portion 3a, a filter accommodating portion 3c, which is a circular hole for arranging a dustproof filter 9 described later, is formed. A recess 3d coaxial with the filter accommodating portion 3c is formed at the bottom of the hole of the filter accommodating portion 3c. The inner diameter of the recess 3d is smaller than the inner diameter of the filter accommodating portion 3c and larger than the outer diameter of the air supply pipe 3B described later. The bottom portion of the recess 3d penetrates into the shaft portion 3b.

The outer shape of the shaft portion 3b is a columnar shape coaxial with the disc portion 3a. A part of the recess 3d penetrates into the center of the end portion (upper end portion in the drawing) of the shaft portion 3b connected to the disk portion 3a. A mounting hole 3e, which is a cylindrical hole coaxial with the recess 3d, penetrates the bottom of the recess 3d in the axial direction. The inner diameter of the mounting hole 3e is smaller than the inner diameter of the recess 3d. The inner diameter of the mounting hole 3e has a dimension that allows the air supply pipe 3B to be press-fitted.
As the material of the holder 3A, the same synthetic resin material as that of the main body 2 may be used.

The air supply pipe 3B is provided inside the shower head 1 to allow outside air to flow in.
The air supply pipe 3B is composed of a cylindrical pipe having a through hole 3f (gas inlet) having an inner diameter d1 in the central portion. The outer diameter of the air supply pipe 3B has a dimension that can be press-fitted into the mounting hole 3e.
The length of the through hole 3f in the air supply pipe 3B may be 3 mm or more and 20 mm or less. The length of the through hole 3f is more preferably 5 mm or more and 10 mm or less. In the present embodiment, the length of the air supply pipe 3B is about the same as the length of the shaft portion 3b. However, the length of the air supply pipe 3B may be longer or shorter than that of the shaft portion 3b as long as the required length of the through hole 3f is secured. If the air supply pipe 3B is too short, the assembly workability may decrease in the manufacturing process.
The air supply pipe 3B in the present embodiment is press-fitted into the mounting hole 3e so that the first end portion (lower side in the drawing) reaches the end portion of the shaft portion 3b opposite to the disk portion 3a. Therefore, at the end of the shaft portion 3b opposite to the disc portion 3a, a circular hole-shaped exit port 3g having an inner diameter d1, which is an opening of the through hole 3f, is exposed.
In the present embodiment, the second end portion (upper side in the drawing) of the air supply pipe 3B protrudes into the recess 3d. Therefore, inside the recess 3d, a circular suction port 3h having an inner diameter d1 which is an opening of the through hole 3f is exposed.
However, as long as the suction port 3h communicates with the recess 3d, the second end portion of the air supply pipe 3B may be arranged so as not to protrude into the recess 3d.
By incorporating the air supply pipe 3B in the shaft portion 3b in this way, it is possible to prevent the air supply pipe 3B from bending or breaking. However, the air supply pipe 3B may protrude from the shaft portion 3b as long as it can be assembled to the shower head 1 so that the air supply pipe 3B does not bend or break.

The inner diameter d1 of the through hole 3f greatly contributes to the bubble diameter distribution of bubbles in the gas-liquid mixed flow described later. If the inner diameter d1 is too small, the bubble diameter of the bubbles becomes too small. If the inner diameter d1 becomes too large, the bubble diameter of the bubbles becomes too large.
The inner diameter d1 is determined so that at least the bubble diameter distribution of the gas-liquid mixed flow is bimodal. For example, the inner diameter d1 may be 0.1 mm or more and 0.4 mm or less.
Further, in the bimodal distribution, for example, when the liquid is water and the gas is air as in the present embodiment, the respective predominant peaks are the first bubble diameter of 5 μm or more and 50 μm or less and 0.18 mm. It is more preferable that it appears in the second bubble diameter of 0.68 mm or more. Therefore, the inner diameter d1 is more preferably 0.20 mm or more and 0.30 mm or less. In order to further increase the sum of the number of bubbles having the first bubble diameter and the number of bubbles having the second bubble diameter, the inner diameter d1 is more preferably 0.22 mm or more and 0.28 mm or less.
The characteristics of the bubble diameter distribution obtained by each inner diameter d1 will be described later together with the action of the shower head 1.

The material of the air supply pipe 3B is not particularly limited as long as the inner diameter d1 of the through hole 3f is maintained at a required size while being attached to the shower head 1 together with the holder 3A. For example, a metal pipe may be used as the air supply pipe 3B in that the processing is easy and the stability of the inner diameter d1 is excellent. In particular, it is more preferable to use a stainless steel pipe as the air supply pipe 3B in that rust is unlikely to occur even if it comes into contact with water.

The dust filter 9 is provided so that the suction port 3h is not blocked by dust or the like contained in the air flowing in from the outside. The configuration of the dustproof filter 9 is not particularly limited as long as it has an appropriate filter diameter that can remove dust and the like having a size that may block the suction port 3h.
Specific examples of the dustproof filter 9 include urethane foam, a boiled metal, and the like.
The method of fixing the dustproof filter 9 to the filter accommodating portion 3c is not particularly limited.
For example, in the present embodiment, a locking projection 3i is formed at the inner edge of the opening of the filter accommodating portion 3c in the disk portion 3a to form an opening slightly narrower than the outer shape of the dustproof filter 9. The dustproof filter 9 is fitted and fixed in the filter accommodating portion 3c through the opening between the locking projections 3i. The dustproof filter 9 fitted in the filter accommodating portion 3c is prevented from coming off by the locking projection 3i.
As described above, it is more preferable that the dust-proof filter 9 is fixed by fitting and fixing because a part of the dust-proof filter 9 is not clogged as in the case where the dust-proof filter 9 is fixed by an adhesive or an adhesive.

As shown in FIG. 3, the opening plug 3 having such a configuration is hermetically and liquidtightly fixed to the mounting hole portion 2g in a state where the disk portion 3a is exposed to the outside of the main body portion 2. In the state where the opening plug 3 is fixed, the exit port 3g is arranged on the central axis O and is exposed to the hollow portion 5h.
The method of fixing the opening plug 3 to the mounting hole 2g is not particularly limited as long as the airtightness and the liquidtight state are maintained.
The method for fixing the opening plug 3 is not particularly limited as long as the space between the outer peripheral portion of the holder 3A and the head portion 2A is kept airtight and liquidtight. For example, in the present embodiment, the opening plug 3 is fixed by press fitting into a through hole formed in the head portion 2A, for example.

For example, as a method of fixing the opening plug 3, it is also conceivable to fix the opening plug 3 by screwing by forming a male screw and a female screw in the opening plug 3 and the mounting hole 2g, respectively. However, a fine gap is likely to occur between the male screw and the female screw. Furthermore, the gap between the male screw and the female screw also changes due to the variation in parts and the variation in assembly. For this reason, it is often the case that the required airtight state cannot be obtained by fixing by screwing. If the required airtight state cannot be obtained, the inner diameter d1 of the through hole 3f apparently becomes large, so that the bubble diameter distribution may change.
However, the opening plug 3 may be fixed by screwing as long as the required airtight state can be stably obtained by, for example, using a sealing member together.

As shown in FIG. 3, the partition plate 7 has a substantially disk shape that covers the locking portion 2r, the inflow port portion 2c, the spiral partition wall 2b, and the outer cylinder portion 5a of the swivel cylinder 5 inside the cylindrical portion 2i. It is a member. The partition plate 7 has a first plate surface 7d and a second plate surface 7e. The first plate surface 7d is a plane orthogonal to the central axis O and oriented in the negative direction of the Z axis. The second plate surface 7e is a plane orthogonal to the central axis O and oriented in the positive direction of the Z axis.
An insertion protrusion 7a that fits into the inner peripheral portion of the outer cylinder portion 5a of the swivel cylinder 5 is projected from the central portion of the second plate surface 7e.
In the central portion of the partition plate 7 including the insertion protrusion 7a, a through hole composed of an injection port 7c and a tapered portion 7b penetrates from the first plate surface 7d in the plate thickness direction.
The injection port 7c is a circular hole extending from the first plate surface 7d to the intermediate portion of the partition plate 7 in the plate thickness direction. The inner diameter of the injection port 7c is larger than the outer diameter of the inner cylinder portion 5d of the swivel cylinder 5.
The tapered portion 7b is composed of a tapered surface whose diameter gradually increases from the end portion of the injection port 7c extending inside the partition plate 7.
Although not shown in FIG. 3, a through hole is provided on the outer peripheral side of the partition plate 7 from the insertion protrusion 7a at a position corresponding to the tap hole 2f of the main body 2 to insert the tapping screw of the countersunk head. ing.

The partition plate 7 having such a configuration sandwiches the rubber packing 11 laminated on the second plate surface 7e, the locking portion 2r, the inflow port portion 2c, the spiral partition wall 2b, and the outer cylinder of the swivel cylinder 5. It is arranged so as to cover the portion 5a.
The rubber packing 11 may be provided separately from the partition plate 7, or may be formed on the second plate surface 7e of the partition plate 7. The material of the rubber packing 11 is not particularly limited as long as the required sealing performance can be obtained. For example, as the material of the rubber packing 11, natural rubber, silicon rubber, or the like having excellent sealing properties and durability may be used.
The partition plate 7 and the rubber packing 11 arranged in this way are inserted into the through holes of the partition plate 7 (not shown) and fixed to the head portion 2A by the tapping screw (not shown) screwed into the tap hole 2f (see FIG. 4). NS. As a result, the rubber packing 11 is urged to the contact portion with the locking portion 2r, the spiral partition wall 2b, and the outer cylinder portion 5a, so that the contact portion with the rubber packing 11 is in an airtight and watertight state. Is.
Therefore, in the inflow port portion 2c, the first flow path 2d, and the second flow path 2e, the openings on the negative side of the Z axis are closed airtightly and watertightly by the partition plate 7 and the rubber packing 11.
Further, the outer cylinder portion 5a is pressed from the partition plate 7 via the rubber packing 11, so that the swivel cylinder 5 is pressed against the recess 2p. As a result, the O-ring 6A is deformed, so that the space between the concave portion 2p and the bottom surface portion 5g becomes airtight and watertight.
Therefore, it is possible to prevent liquid or gas from flowing between the second flow path 2e and the hollow portion 5h through the recess 2p and the bottom surface portion 5g.

As shown in FIG. 3, in the state where the partition plate 7 is assembled, the tip end portion of the inner cylinder portion 5d of the swivel cylinder 5 does not protrude from the injection port 7c in the negative direction of the Z axis and is inside the injection port 7c. We are advancing.
A cylindrical flow path 5i (rotary flow forming path) is formed between the inner peripheral surface of the outer cylinder portion 5a and the outer peripheral surface of the inner cylinder portion 5d. The cross section orthogonal to the central axis O of the cylindrical flow path 5i (hereinafter referred to as a cross section perpendicular to the axis) is an annular shape.
On the negative side of the Z-axis with respect to the cylindrical flow path 5i, a reduced diameter flow in which the outer diameter of the annulus in the cross section perpendicular to the axis is gradually reduced due to the gap between the tapered portion 7b and the outer peripheral surface of the inner cylinder portion 5d. Road 5j is formed. Further, the gap between the injection port 7c and the outer peripheral surface of the inner cylinder portion 5d forms a gap portion 5q in which the cross-sectional area of the annulus in the cross section perpendicular to the axis forms the minimum flow path.
In the negative direction of the Z axis with respect to the tip portion 5p of the inner cylinder portion 5d, a circular flow path 5r having a circular cross section perpendicular to the axis is formed inside the injection port 7c.
The portions of the tapered flow path 5j, the narrow gap portion 5q, and the tapered portion 7b, the inner cylinder portion 5d, and the injection port 7c forming the circular flow path 5r are airtightly connected to the rotary flow forming path and will be described later. It constitutes a first nozzle portion that accelerates the rotary flow W ₂ (see FIG. 7) and _{injects the rotary flow W 2} from an injection port 7c provided coaxially with the central axis O.

On the first plate surface 7d of the partition plate 7, the decorative plate 10 is laminated in the range excluding the opening by the injection port 7c.
The decorative plate 10 is provided so that the flow of the gas-liquid mixed flow described later becomes smooth by, for example, smoothing the unevenness of the surface generated by the screw head of the tapping screw, the insertion hole of the tapping screw, and the like. As the material of the decorative plate 10, for example, resin may be used. As the fixing means of the decorative plate 10, for example, an adhesive, double-sided tape, or the like may be used.
For example, when at least a part of the decorative plate 10 is visible from the outside through the outlet cap 4 described later, the decorative plate 10 may be decorated in consideration of the appearance. For example, the surface of the decorative plate 10 may be resin-plated.

The outlet cap 4 includes a plate-shaped portion 4b and a side surface portion 4c.
The plate-shaped portion 4b (second nozzle portion) is a disk member capable of covering the cylindrical portion 2i of the head portion 2A. The plate-shaped portion 4b is arranged so as to face the partition plate 7 with a gap open in the Z-axis direction.
At the center of the plate-shaped portion 4b, a dispersion plate fixing portion 4d for fixing the dispersion plate 8 described later projects in the positive direction of the Z axis. The shape of the dispersion plate fixing portion 4d is not particularly limited as long as the dispersion plate 8 described later can be fixed from the negative direction side of the Z axis. In this embodiment, as an example, it is configured by an annular boss (see FIG. 6) having a fitting hole in the center.

As shown in FIGS. 2 and 3, in the plate-shaped portion 4b, on the outer peripheral side of the dispersion plate fixing portion 4d, a large number of outlets for injecting the gas-liquid mixed flow formed inside the shower head 1 to the outside. The nozzle 4a (second injection port) is penetrated.
The cross-sectional diameter of each outlet nozzle 4a is gradually reduced in the negative direction of the Z axis. The minimum inner diameter of each outlet nozzle 4a may be 0.2 mm or more and 1.0 mm or less. The minimum inner diameter of each outlet nozzle 4a is more preferably 0.5 mm or more and 1.0 mm or less. It is more preferable that the minimum inner diameter of each outlet nozzle 4a is 0.7 mm or more and 1.0 mm or less.
Since the bubbles contained in the gas-liquid mixed flow are elastically deformed to some extent in the liquid, not all of them are crushed even if the minimum inner diameter of the outlet nozzle 4a is smaller than the bubble diameter. However, if the minimum inner diameter of the outlet nozzle 4a is too small, the possibility that the bubbles contained in the gas-liquid mixed flow ejected from the outlet nozzle 4a will be crushed at the time of injection increases. Therefore, it is more preferable that the minimum inner diameter of the outlet nozzle 4a is larger than the maximum diameter of the bubbles to be included in the gas-liquid mixed flow injected to the outside of the outlet cap 4.
If the minimum inner diameter of the outlet nozzle 4a exceeds 1.0 mm, the flow velocity of the gas-liquid mixed flow ejected from the outlet nozzle 4a becomes too low under the water pressure of tap water supplied for home use, and the cleaning efficiency is lowered. There is a risk of

As shown in FIG. 3, the side surface portion 4c extends in the positive direction of the Z axis from the outer edge of the plate-shaped portion 4b. An uneven fitting portion 4e that fits with the uneven fitting portion 2s formed on the outer peripheral portion of the cylindrical portion 2i is formed on the inner peripheral surface of the front end portion of the side surface portion 4c in the extending direction. For example, the uneven fitting portion 4e may be composed of a female screw or the like. However, unlike the illustrated example of FIG. 3, the side surface portion 4c of the outlet cap 4 may be inserted and fixed to the inner peripheral portion of the head portion 2A. In this case, the concave-convex fitting portion 2s may be composed of a female screw and the concave-convex fitting portion 4e may be composed of a male screw.
A stepped O-ring pressing portion 4f that presses the O-ring 6B in the radial and axial directions with respect to the O-ring mounting portion 2t is formed on the inner peripheral surface of the side surface portion 4c on the tip side of the uneven fitting portion 4e. ing.

When the outlet cap 4 is fitted to the concave-convex fitting portion 2s of the cylindrical portion 2i in the concave-convex fitting portion 4e, the outlet cap 4 is fixed coaxially with the cylindrical portion 2i. At this time, the O-ring 6B is sandwiched between the O-ring mounting portion 2t and the O-ring holding portion 4f and compressed. This prevents leakage of airflow, liquid flow, and gas-liquid mixed flow from the gap between the O-ring mounting portion 2t and the O-ring holding portion 4f.
In such an assembled state, a disk-shaped space having a certain thickness in the Z-axis direction and having only the outlet nozzle 4a opening to the outside is formed between the partition plate 7 and the plate-shaped portion 4b. ..

The dispersion plate 8 is configured such that a fixing protrusion 8a fitted to the dispersion plate fixing portion 4d is erected at the center of a disk having a diameter D. The dispersion plate 8 is fixed to the main body portion 2 together with the outlet cap 4 in a state where the fixing protrusion 8a is fitted to the dispersion plate fixing portion 4d. For example, the fixing protrusion 8a may be press-fitted into the dispersion plate fixing portion 4d. For example, the fixing protrusion 8a may be adhesively fixed to the dispersion plate fixing portion 4d.

In such an assembled state, the surface 8b of the dispersion plate 8 in the positive direction of the Z axis is orthogonal to the central axis O. The dispersion plate 8 is fixed so as to be coaxial with the central axis O.
The diameter D of the dispersion plate 8 is larger than the inner diameter d2 (see FIG. 7) of the injection port 7c and smaller than the inner diameter of the cylindrical portion 2i.
As a result, the dispersion plate 8 is arranged at a position facing the negative pressure region described later, which is formed in the vicinity of the injection port 7c.
Further, the gas-liquid mixed flow described later, which is injected from the injection port 7c, collides with the dispersion plate 8. The gas-liquid mixed flow that collides with the dispersion plate 8 flows radially outward along the surface 8b, passes through the gap between the inner peripheral surface of the side surface portion 4c and the outer edge of the dispersion plate 8, and is a plate-shaped portion. Reach 4b.
The dispersion plate 8 has an action of crushing bubbles by the impact force when the gas-liquid mixed flow collides. The diameter D of the dispersion plate 8 and the distance h between the dispersion plate 8 and the injection port 7c are appropriately set according to the required bubble diameter distribution of the gas-liquid mixed flow.
Further, the diameter D of the dispersion plate 8 is set so that the gas-liquid mixed flow can be dispersed in a range of radiation angles suitable for the use of the shower head 1. The preferable size of the diameter D will be described later together with the explanation of the action.
For example, the distance h between the surface 8b of the dispersion plate 8 and the surface of the decorative plate 11 facing the surface 8b may be 2.0 mm or more and 3.5 mm or less. The distance h is more preferably 2.0 mm or more and 3.0 mm or less in order to make the bubble diameter distribution of the bubbles bimodal so that the cleaning effect is particularly high.

Next, the operation of the shower head 1 will be described.
FIG. 7 is a schematic vertical sectional view illustrating the flow of gas and liquid in the mixing bubble generator according to the first embodiment of the present invention.

As shown in FIG. 3, in the shower head 1, when the pressurized water W _{0 is injected into the water injection pipe line 2a, the gas-liquid mixed flow W 5} described later is injected from each outlet nozzle 4a. First, the principle of forming the gas-liquid mixed flow W ₅ will be described based on the flow of _{water W 0.}
When the water _{W 0} is flowed into the water injection conduit 2a, the water _{W 0} enters the opening 2n from the inlet section 2c.
As shown in FIG. 4, the water W ₀ flowing into the opening 2n swirls counterclockwise as shown along the first flow path 2d. Further, the water W ₀ enters the second flow path 2e from the first flow path 2d and continues to turn counterclockwise as shown along the second flow path 2e.
When the water W ₀ reaches the inflow opening 5c _{, the water W 1c,} which is a part of the _{water W 0} , flows into the inside of the outer cylinder portion 5a from the inflow opening 5c. _{The water W 0} that does not flow in from the inflow opening 5c flows into the inside of the outer cylinder portion 5a as the _{water W 1b} from the inflow opening 5b at the end of the second flow path 2e.
Since both the water W _1b and W _1c are flows that diverge diagonally in the inner peripheral direction from _{the water W 0} that swirls around the outer cylinder portion 5a, even inside the outer cylinder portion 5a, the water W 1b and the inner cylinder portion 5d Within the range of the annular gap between the outer cylinder portion 5a and the outer cylinder portion 5a, each turns counterclockwise as shown in FIG.

As shown in FIG. 7, a cylindrical flow path 5i is formed between the outer cylinder portion 5a and the inner cylinder portion 5d. A reduced diameter flow path 5j is formed between the tapered portion 7b and the inner cylinder portion 5d. A narrow gap portion 5q is formed between the inner peripheral surface of the injection port 7c and the inner cylinder portion 5d. A circular flow path 5r is formed inside the injection port 7c on the negative direction side of the Z axis with respect to the tip portion 5p.
The hollow portion 5h extends on the positive direction side of the Z axis with respect to the circular flow path 5r. The hollow portion 5h communicates with the outside of the shower head 1 through the through hole 3f of the air supply pipe 3B.
_{The waters W 1b} and W _1c flowing in from the inflow openings 5b and 5c move toward the injection port 7c while spirally rotating in the same direction around the inner cylinder portion 5d due to water pressure. Since the water W _1b and the water W _1c are mixed while colliding with each other as they proceed in the negative direction of the Z axis, a rotary flow W ₂ is formed.

In the present embodiment, the water W ₀ flowing into the swivel cylinder 5 faces the second flow path 2e and flows in from two locations of the inflow openings 5b and 5c facing each other across the central axis O. _{As shown in FIG. 4, the flow velocity of the water W 0} before flowing into the swirl cylinder 5 increases as it flows from the inlet portion 2c to the first flow path 2d and the second flow path 2e. This is because, in the present embodiment, the flow path cross-sectional area of the second flow path 2e is smaller than the flow path cross-sectional area of the first flow path 2d.
Therefore, the water W ₀ flowing inlet opening 5b, from 5c to the inside of the turning cylinder 5 has a faster flow than the flow velocity in the inlet section 2c.
Further, the water W ₀ rotates counterclockwise as shown with respect to the central axis O by flowing through the spiral first flow path 2d and the second flow path 2e.
The water W ₀ flows into the cylindrical flow path 5i of the swivel cylinder 5 as the _{water W 1b} and W _1c while maintaining the velocity component in the rotational direction along the inclination of the inflow openings 5b and 5c. The waters W _1b and W _1c are further accelerated in response to changes in the flow path cross-sectional area due to the inflow openings 5b and 5c.
In this way, water W _1b and W _1c flow into the cylindrical flow path 5i as a flow having rotational components in the same direction from two locations separated in the circumferential direction, as compared with the case where the inflow opening is one location. Therefore, the rotation speed of the rotary flow W _{2 is improved.}
For example, when the swivel cylinder 5 does not have the inflow opening 5c, the water W _1b goes around the cylindrical flow path 5i once and then joins the _{subsequent water W 1b.} The preceding water W _1b decelerates due to the flow path resistance during one round. Therefore, the succeeding water W _1b merges with the decelerated preceding water W _1b , so that the flow velocity decreases as a whole.
However, as in the present embodiment, when the inflow opening 5c is provided, the water W _1b merges _{with the water W 1c} flowing in from the inflow opening 5c at a position where the inflow opening 5c is in a state where the speed decrease is smaller than in the case of making one round. do. _{Therefore, a higher speed rotating flow W 2} is formed as compared with the case where the swivel cylinder 5 does not have the inflow opening 5c.
As described above, in the present embodiment, the flow path cross-sectional area in the first flow path 2d and the second flow path 2e is reduced toward the inflow opening 5b, and the swivel cylinder 5 has a plurality of openings at two locations. and it is, but I coupled with a high-speed rotary flow W ₂ is formed.

The cylindrical flow path 5i is airtightly connected to the inlet portion 2c, and constitutes a rotary flow forming path that forms a rotary flow _{W 2} that is rotated around the central axis O by _{the water W 0 flowing from the inlet portion 2c.} There is.
For example, the rotational speed of the rotating flow W ₂ in the cylindrical channel 5i is more preferably 1000 times / min or more.

The rotational flow forming passage, water W _1b, while water W _1c is rotated at high speed, to mix while clash with each other, the rotational flow W ₂ thereby formed, easily penetrates the inside of the dirt components in the wash object Become. That is, the rotary flow W ₂ has an improved penetrating power to the dirt component.
All the rotating flow W ₂ information, that air bubbles, which will be described later in the rotating flow W ₂ is easy to disperse.

The rotational flow forming passage is also effective to raise the pH of the rotating flow W _2. This is because the hypochlorite ions contained in tap water (free residual chlorine) and the water reaction is accelerated, it is considered that the hydroxide ion concentration is because increases.
Therefore, the rotary flow W ₂ becomes water that is weakly alkaline and has a reduced free residual chlorine component.

While the rotary flow W ₂ rotates, the flow velocity increases by advancing the reduced diameter flow path 5j in the negative direction of the Z axis. The flow velocity of the rotary flow W ₂ is maximized at the narrow gap portion 5q. The rotary flow W ₂ is ejected into the circular flow path 5r through the narrow gap portion 5q. At this time, the ambient gas outlet 5k, since the flow speed rotating flow W _2, near the gas outlet 5k of the inner cylinder portion 5d facing the circular passage 5r becomes negative pressure. Since the dispersion plate 8 is arranged below the gas outlet 5k in the drawing, the negative pressure region extends from the gas outlet 5k toward the center of the surface 8b of the dispersion plate 8.
Therefore, the external air G (gas) is sucked through the suction port 3h communicating with the gas outlet 5k. Since the air G passes through the dustproof filter 9 when sucked from the suction port 3h, the air G does not contain dust having a diameter larger than the filter diameter of the dustproof filter 9. Therefore, the air G is sucked in without the suction port 3h being blocked by the dust. Suction amount of air G is the magnitude of the negative pressure due to rotational flow W _2, and the inner diameter d1 of the inlet 3h, it depends.

The air G sucked from the suction port 3h is injected into the hollow portion 5h from the exit port 3g through the through hole 3f. Air G in the hollow portion 5h from the gas outlet port 5k enter the circular passage 5r, mixed in rotating flow W _2.
Air G, when mixed into rotating flow W _2, to form a bubble in the rotary flow W _2.
Rotating flow W ₂ to be injected into the annular from a slit portion 5q, since collide with each other inside the injection port 7c, taking in air G ejected from the gas body outlet 5k therein. Therefore, the rotary flow W _{2 becomes a gas-liquid mixed flow W 3} having a rotational component around the central axis O, and is injected from the injection port 7c in the negative direction of the Z axis.

The bubble diameter of the bubbles contained in the gas-liquid mixed flow W ₃ is defined by the inner diameter d1 of the through hole 3f and the magnitude of the negative pressure in the vicinity of the gas outlet 5k. As the flow rate of water W ₀ increases, the negative pressure also increases as the flow velocity increases. However, according to a diligent study by the present inventor based on an experiment, when the magnitude of the negative pressure becomes large to some extent, the size of the generated bubble diameter is substantially determined by the size of the inner diameter d1. As described above, the smaller the inner diameter d1, the smaller the size of the generated bubble diameter. Further, according to the study of the present inventor, in the region of the flow velocity in which the size of the generated bubble diameter is substantially determined by the size of the inner diameter d1, the number of bubbles increases as the flow rate of _{water W 0 increases.}

Gas-liquid mixed flow W ₃ injected from the injection port 7c impinges on the surface 8b of the distribution plate 8 which faces the injection port 7c. By striking the surface 8b, a result of acting impact force on bubbles in gas-liquid mixed flow W _3, or bubbles coalesce, or crushed. Therefore, from the gas-liquid mixed flow W _3, the gas-liquid mixed flow W ₄ is a gas-liquid mixed flow W ₃ having different bubble diameter distribution is formed.
When the bubble diameter of the bubbles contained in the gas-liquid mixed flow W ₃ is small, the gas-liquid mixed flow W ₄ contains bubbles having a larger bubble diameter. However, in the present embodiment, even if the bubble diameter is large, it does not exceed the inner diameter of the outlet nozzle 4a.

As shown in FIG. 3, the gas-liquid mixed flow W ₄ rotates from the outer peripheral portion of the dispersion plate 8 to the inside of the outlet cap 4 and enters each outlet nozzle 4a in the plate-shaped portion 4b. Each outlet nozzle 4a, the flow rate of the gas-liquid mixed flow W ₄ is accelerated. Since the gas-liquid mixed flow W ₄ has a velocity component that goes outward in the radial direction along the dispersion plate 8, the gas-liquid mixed flow W ₅ emitted from each outlet nozzle 4a emits radially around the central axis O. Will be done.
For example, in the shower head 1, _{the spread angle of the gas-liquid mixed flow W 4 in} the cross section including the central axis O is more preferably about 45 ° or more and 90 ° or less.
For example, the shower head 1 of this embodiment, the inner diameter of the injection port 7c is 4.4 mm, the distance h is 2.5mm and decorative plate 11 and the surface 8b, when the spread angle of the gas-liquid mixed flow _{W 4} above In order to set the range of, the diameter D of the dispersion plate 8 may be 30 mm or more and 32 mm or less.

The flow path from the outer edge of the dispersion plate 8 to the outlet nozzle 4a has a wider flow path cross-sectional area than the flow path between the first plate surface 7d and the dispersion plate 8, so that the interaction between bubbles is smaller. Become. Therefore, the gas-liquid mixed flow W ₅ does not change much from the bubble diameter distribution of the gas-liquid mixed flow W _4.

Next, the bubble diameter distribution of the gas-liquid mixed flow W _{5 will be described.}
FIG. 8 is a schematic graph showing an example of the bubble diameter distribution of the gas-liquid mixed flow generated by the mixing bubble generator according to the first embodiment of the present invention. In the graph of FIG. 8, the horizontal axis represents the bubble diameter and the vertical axis represents the number of bubbles.

Bubble diameter measurements of the gas-liquid mixed flow W ₅ may acquire a bubble image of injecting mixed vapor and liquid stream W ₅ at the top of the tank under atmospheric pressure, distributed in a range of forward 10cm~20cm plate portion 4b It is done by doing.
The bubble diameter distribution of the gas-liquid mixed flow W ₅ is bimodal as schematically shown in FIG.
The first bubble group B _m has a first predominant peak in which the bubble diameter is m _p and the number of bubbles is N _m. Bubble diameter of the first bubble group _{B m} is, m1 or m2 (although, _m2> m _p> m1) distributed in the following range. For example, m1 and m2 are more preferably 5 μm and 50 μm, respectively.
The second bubble group B _t has a second predominant peak in which the bubble diameter is t _p and the number of bubbles is N _t. Bubble diameter of the second bubble group _{B t} is, t1 or t2 _{(However, t2> t p>t1>} m2) distributed in the following range. For example, t1 and t2 may be 0.1 mm and 1.0 mm, respectively. For example, t1 and t2 are more preferably 0.18 mm and 0.68 mm, respectively.

For example, the number of bubbles first bubble group B _m is the total number of bubbles in the gas-liquid mixed flow W _5, it may be 30% to 60%. For example, the number of bubbles first bubble group B _m is the total number of bubbles in the gas-liquid mixed flow W _5, and more preferably 60% or less than 50%.
For example, the number of bubbles second bubble group B _t is the total number of bubbles the gas-liquid mixed flow W _5, may be 20% or more 50% or less. For example, the number of bubbles second bubble group B _t is the total number of bubbles the gas-liquid mixed flow W _5, and more preferably 50% or less than 30%.
For example, the sum of the number of bubbles first bubble group B _m and the number of bubbles and second bubbles group B _t is the total number of bubbles the gas-liquid mixed flow W _5, a 100% or more and 60% or less May be. For example, the sum of the number of bubbles first bubble group B _m and the number of bubbles and second bubbles group B _t is the total number of bubbles the gas-liquid mixed flow W _5, is 80% or more and 100% or less Is more preferable.

Bubbles in a liquid are formed into a constant bubble diameter by balancing the pressure of the gas forming the bubbles with the pressure of the liquid surrounding the gas. However, since the bubbles in the liquid have a natural frequency corresponding to the bubble diameter, they have sonic vibration energy by vibrating at the natural frequency.
As the bubble diameter becomes smaller, the natural frequency of the bubble increases, but the vibration tends to be attenuated due to the influence of the viscosity of the liquid. For this reason, bubbles with a small bubble diameter have less flexibility (soft swelling) to contract and expand, and float in the liquid with a stable bubble diameter, permeate into the gaps of dirt components, and dirt components. It sticks to. Even if such bubbles are adsorbed on the dirt component, sonic vibration energy is hardly given to the dirt component.
The bubble diameter of the fine bubbles in which such a property becomes particularly remarkable is, for example, 5 μm or more and 50 μm or less in the case of a gas-liquid mixed flow of water and air. In the present specification, such microbubbles composed of microbubbles of 5 μm or more and 50 μm or less are referred to as “ type 1 bubbles”.
When the gas-liquid mixed flow is sprayed onto the object to be cleaned, the first-class bubble easily permeates the dirt component. The first bubble group B _m contained in the gas-liquid mixed flow W ₅ of the shower head 1 contains a large amount of first-class bubbles.

On the other hand, when the bubble diameter of the bubble is large, the influence of the viscosity of the liquid is relatively reduced, so that the soft swelling property is increased, so that the sonic vibration energy is increased and the bubble diameter is likely to change. Therefore, the bubbles vibrate violently at the natural frequency. When such bubbles are impactfully destroyed, the bubbles burst and generate a shock wave.
Such a bubble property is suppressed whether the bubble diameter is too large or too small. Therefore, the sound wave vibration energy of the bubble will decrease if the bubble diameter is too large or too small.
The bubble diameter of the bubbles in which the sonic vibration energy is particularly high is, for example, 0.18 mm or more and 0.68 mm or less in the case of a gas-liquid mixed flow of water and air. In the present specification, such bubbles having a bubble diameter of 0.18 mm or more and 0.68 mm or less are referred to as " type 2 bubbles".
Since the second-class bubble in a liquid is not easily affected by the viscosity of water, it is highly active in ascending and expanding while vibrating. In addition, Type 2 bubbles can burst in or on the surface of a liquid.
When the gas-liquid mixed flow is sprayed onto the object to be cleaned, such a type 2 bubble tends to be adsorbed to the dirt component and peeled off from the dirt component. Further, since a shock wave is generated when a second-class bubble bursts, it has an action of crushing or decomposing the dirt component when it bursts while adhering to the dirt component. Even if the second-class bubble bursts at a position away from the dirt component, its shock wave propagates in the liquid and hits the dirt component, so that the impact is transmitted to the dirt component.
Second bubble group B _t contained in the gas-liquid mixed flow W ₅ of the shower head 1 includes a number of the second kind bubble.

According to the study of the present inventor, in the shower head 1, the first bubble group B _m is considered to be generated mainly at the injection port 7c when the rotary flow W ₂ and the air G are mixed. That is, it is considered that most of the gas-liquid mixed flow W ₃ is composed of the first bubble group B _m. Therefore, it is particularly preferable that the inner diameter d1 of the through hole 3f is an inner diameter capable of forming a first-class bubble.
As described above, it is necessary to reduce the opening area of the inner diameter d1 in order to stably form the first-class bubble.
Therefore, it is important to ensure the airtightness of the flow path from the suction port 3h to the gas outlet 5k so that the air G does not enter the hollow portion 5h by a path other than the through hole 3f. In the present embodiment, the assembly is made so that there is no gap between the opening plug 3 and the mounting hole 2g, and between the air supply pipe 3B and the mounting hole 3e, and an O-ring is provided between the main body 2 and the swivel cylinder 5. By providing 6A, the intrusion of air G is prevented.
Therefore, the hollow portion 5h constitutes a gas introduction chamber that airtightly connects the suction port 3h and the gas outlet 5k. The hollow portion 5h, since having a flow path cross-sectional area than the through-hole 3f, for example, even if the splash of the water W ₀ from the gas outlet port 5k invade, not the flow of air G stagnates.

Similarly, it is important to ensure the airtightness of the flow path so that the air G does not enter the cylindrical flow path 5i and the reduced diameter flow path 5j from other than the hollow portion 5h. In the present embodiment, the intrusion of air G is prevented by sandwiching the rubber packing 11 between the swivel cylinder 5 and the partition plate 7.

According to the studies of the present inventors, in the shower head 1, the second bubble group B _t as wake that has been gas-liquid mixed flow W ₃ injected from the injection port 7c collides with the dispersion plate 8, vigorous stream It is thought that it is generated when some of the fine bubbles begin to coalesce.
Therefore, the gas-liquid mixed flow W _4, included bubbles relatively large diameter as a second bubble group B _t is. Further, in the process in which the gas-liquid mixed flow W ₄ is gradually released from the pressure in the flow path between the partition plate 7 and the outlet cap 4, the bubble diameter of the coalesced bubbles grows, and further coalescing and splitting are repeated. By doing so, it is considered that the bubble diameter of the bubbles is polarized.
Since the bubbles that have become too large are crushed at the outlet nozzle 4a, it is considered that the gas-liquid mixed flow W ₅ ejected from the outlet nozzle 4a exhibits bimodality as shown in FIG.
According to the studies of the present inventors, in order to increase the content of the second type bubble in the second bubble group B _t is between the decorative plate 11 is an outlet of the gas-liquid mixed flow W ₄ and the dispersion plate 8 It is also important to properly set the distance h. In the case of the shower head 1 of the present embodiment, by setting the distance h to 2.0 mm or more and 3.0 mm or less, the content rate of the second type bubble becomes particularly good.

As described above, the gas-liquid mixed flow W ₅ ejected from the shower head 1 has a _{first bubble group B m} containing a large amount of type 1 bubbles and a second bubble group B containing a large amount of type 2 bubbles. _t and are mixed. Therefore, the shower head 1 is a mixed bubble generator in which the first-class bubbles and the second-class bubbles coexist. It is more preferable that the bubbles contained in the gas-liquid mixed flow W ₅ are composed of type 1 bubbles and type 2 bubbles.

Next will be described in comparison with Comparative Example the cleaning action of the gas-liquid mixed flow W _5.
FIG. 9 is a schematic diagram illustrating the action of the washing water containing the first-class bubble. FIG. 10 is a schematic diagram illustrating the action of a gas-liquid mixed flow in the mixing bubble generator according to the first embodiment of the present invention.

In the washing example shown in FIG. 9, the dirt 51 adhering to the cleaning target object 50 such as a dish, the gas-liquid mixed flow W _m is a comparative example in which washing is injected is carried out.
The gas-liquid mixed flow W _m is composed of tap water L mixed with a large number of _{first bubbles b m} belonging to the first _{bubble group B m.} Examples of the stain 51 include solid components such as food scraps and liquid components such as oil.
The first bubble b _m does not easily burst even when the gas-liquid mixed flow W _m hits the dirt 51, and permeates into the gaps of the dirt 51 like fine particles or is adsorbed on the surface of the dirt 51. do. The reason why the first bubble b _m adheres to the dirt 51 is that _{the surface of the first bubble b m} is negatively charged in the process of forming the bubble.
Therefore, dirt 51 is in a state where the first bubble b _m is filled in the surface and gaps. For entities of the first bubble b _m is air, a state in which a large number of gap is formed in the dirt 51. As a result, dirt 51 is easily peeled off from the region where the first bubble b _m is dense. In particular, when the liquid component in the dirt 51, since the first bubble b _m penetrates, a state equivalent to that wettability is improved apparent is formed.

However, since the first bubble b _m are stable, does not stain 51 itself or removed immediately crushed. Therefore, dirt 51, the injection pressure of the tap water L, the first bubble b _m is gradually washed by like is peeled off from the gap entering. Therefore, even if the dirt 51 is washed, it takes time to completely remove it. Furthermore, dirt 51, if it is permeated difficult such contamination in the first bubble b _m, it is difficult to remove the dirt 51.

In contrast, in FIG. 10, the cleaning examples are shown by gas-liquid mixed flow W _5. The object to be cleaned 50 and the stain 51 are the same as the cleaning example in FIG.
Gas-liquid mixed flow _{W 5} is in the water _{W 0} first and bubble _{b m} belonging to the first bubble group _{B m,} and a second bubble _{b t} belonging to the second bubble groups _{B t,} is mixed number It is composed.
The first bubble b _m, has the same as the comparative example described above action.
In contrast, the second bubble b _t, since a large bubble diameter, as in the first bubble b _m, it is difficult to penetrate into the dirt 51. However, in the second bubble b _t even bubble formation process, the surface is negatively charged, as in the first bubble b _m, adsorption easily (surface adsorption) to the surface of the dirt 51.
For example, as shown in the left side of FIG. 10, the second bubble b _t, when in contact with dirt 51, by surface adsorption, there is also a case of peeling the portion of the surface of the dirt 51 as release strip 52 ..
Second bubble b _t adsorbed on the surface of the dirt 51 receives a pressure change from the water W ₀ to be injected one after the other, to vibrate violently at the natural frequency. As a result, sound wave vibration energy propagates to the surface of the dirt 51 and the surface of the dirt 51 is weakened, so that peeling and crushing of the dirt 51 are promoted.
Further, when the second bubble b _t ruptures, also by the shock wave propagates in the dirt 51, further dirt 51 is likely to collapse.
Rupture of the second bubble b _t is the case caused by injection pressure of the gas-liquid mixed flow W ₅ which corresponds to the second bubble b _t, the second bubble floating in the interior of the water W ₀ accumulated in the cleaning target object 50 by b _t floats, and a case of explosion (floating rupture). When the levitation burst occurs, the shock wave _{propagates the water W 0} accumulated in the cleaning object 50 and acts on the dirt 51 as well.
Thus, the second bubble b _t from its physical properties, has a dynamic cleaning action different from the first bubble b _m.

Further, the gas-liquid mixed flow W ₅ has a first bubble b _m, a second bubble b _t, because are mixed, the cleaning effect due to synergy. For example, the second bubble b _t is the first bubble b _m adheres to the vicinity of the stain 51 that weakened to penetrate (see left portion of dirt 51 in FIG. 10), the second air bubble b _{The vibration due to t and the} cleaning effect due to the shock wave are significantly enhanced.

The cleaning action of the shower head 1 has been verified by various experiments. For example, the left and the test sample by applying a lard to crockery tableware dish for 10 minutes in the refrigerator, the shower head 1, the gas-liquid mixed flow W ₅ is injected, and the water flow shower only tap water is injected, Compared the cleaning performance. However, neither water contains detergent.
In each of the washings, the conditions of a water volume of 4 L / min, a water temperature of 30 °, a washing time of 37 seconds, and a washing distance of 20 cm were used.
In this case, in the washing with the shower head 1, about 95% of lard was removed after 37 seconds. On the other hand, in the washing with a water shower, only about 20% of lard was removed after 37 seconds.
Therefore, it was verified that the gas-liquid mixed flow W ₅ has a high cleaning ability even for highly viscous oil stains such as lard.

As described above, the shower head 1 of the present embodiment can stably and easily form a gas-liquid mixed flow containing bubbles having a high cleaning effect.
In the present embodiment, the air G enters the through-hole 3f from the intake port 3h, through the hollow portion 5h, is emitted from the gas outlet port 5k, is mixed into the rotating flow W _2. Since the flow path from the suction port 3h to the gas outlet 5k is in an airtight state, the air G flows in only from the suction port 3h. Therefore, the first bubble group B _m including the first type bubble can be stably formed. At that time, since the inner diameter d1 of the suction port 3h is fixed, bubbles can be easily formed as compared with the case where valve control or the like is performed.
Further, opposite to the injection port 7c, by placing the dispersion plate 8 in place, be contained in the mixed vapor and liquid stream W ₅ of the second bubble group B _t containing second type bubble stably can.

Further, the shower head 1, the rotating flow formed passage, by forming the rotating flow W _2, can form a highly gas-liquid mixed flow W ₅ of washing efficiency.
By the rotation action of the rotating flow forming passage is reduced free residual chlorine in water in a rotating flow W ₂ is the rotation flow W ₂ becomes weakly alkaline, it can be suitably used in the human skin.

[Second Embodiment]
The mixed bubble generator of the second embodiment of the present invention will be described.
FIG. 11 is a schematic vertical sectional view showing an example of a mixed bubble generator according to a second embodiment of the present invention. FIG. 12 is a view of B in FIG.

The shower faucet 21 (mixing bubble generator) of the present embodiment shown in FIG. 11 is connected to an appropriate pressurized liquid supply source such as a water pipe, so that the first embodiment is the same as that of the first embodiment. injecting the gas-liquid mixture stream containing seed bubbles and the two bubbles. The liquid component and the gas component in the gas-liquid mixed flow formed by the shower faucet 21 are not particularly limited as in the first embodiment.
Hereinafter, in the description of the gas-liquid mixed flow and the flow path forming the gas-liquid mixed flow, the description common to the first embodiment may be omitted.

The shower faucet 21 as a whole has a substantially columnar outer shape extending along the central axis C (first axis). The shower faucet 21 is attached to the faucet 20 so that the central axis C of the shower faucet 21 is coaxial with the central axis of the tip of the faucet 20 with respect to the appropriate faucet 20. The faucet 20 supplies _{water W 0} similar to that of the first embodiment.
The shower faucet 21 injects a gas-liquid mixed flow in a direction along the central axis C. Therefore, in the first embodiment, the air G is introduced along the rotation center axis of the rotating flow, whereas in the present embodiment, the air G intersects the rotation center axis of the rotating flow described later. Introduced along the direction.

As shown in FIG. 11, the shower faucet 21 includes a faucet fixture 22, a faucet mounting portion 23, a swivel cylinder 24, a main body portion 25, a partition plate 26, an opening plug 3, and a sprinkler plate 28 (second nozzle portion). Be prepared.
Hereinafter, when each component of the shower faucet 21 is described, it will be described based on the arrangement in the assembled state shown in FIG. 11 unless otherwise specified.
Further, in the explanation of the positional relationship of each constituent member, the XYZ Cartesian coordinate system shown in FIG. 11 may be referred to. In the XYZ Cartesian coordinate system, the Z axis is an axis extending from the lower side to the upper side in the drawing along the central axis C at the outlet of the faucet 20. The Y-axis is an axis that is orthogonal to the Z-axis and extends from the left side to the right side in the figure. The X-axis is an axis line orthogonal to the Z-axis and the Y-axis and extending from the front side of the paper surface toward the back side of the paper surface. The positive direction in each axis is the extension direction of each axis as described above. The negative direction on each axis is the opposite of the positive direction.

The faucet fixture 22 is a device portion for fixing the shower faucet 21 to the tip of the faucet faucet 20. As the configuration of the faucet fixture 22, a well-known configuration is used according to the shape of the tip of the faucet faucet 20.
For example, the faucet fixture 22 shown in FIG. 1 fixes a faucet 20 of a type in which the outer peripheral surface of the faucet 20 is cylindrical and a convex portion 20a is formed on the outer periphery of the tip of the faucet 20. The faucet fixture 22 includes an inner cylinder member 22B inserted into the side surface of the faucet 20, a tubular outer cylinder member 22A into which the inner cylinder member 22B is screwed inside, and an outer peripheral portion of the tip of the faucet 20. It is provided with a rubber packing 27 that is pressed against the surface.

The inner cylinder member 22B is formed in a tubular shape through which the faucet 20 can be inserted. On the outer peripheral surface of the inner cylinder member 22B, a male screw 22e screwed with the inner peripheral surface of the outer cylinder member 22A is formed.
A groove portion that engages with the convex portion 20a of the faucet 20 in the negative direction of the Z axis is formed on the inner circumference of the tip portion of the inner cylinder member 22B.

A female screw 22d for screwing a male screw of the inner cylinder member 22B is formed on the inner peripheral surface of the outer cylinder member 22A. The thread diameter of the female thread 22d is the same as the thread diameter of a faucet faucet (hereinafter referred to as a threaded faucet faucet) having a female thread on the outer peripheral portion. Therefore, by removing the inner cylinder member 22B from the faucet fixing tool 22, the outer cylinder member 22A can be directly screwed into the threaded faucet faucet.
At the end of the outer cylinder member 22A on the positive direction side of the Z axis, a flange portion 22b connected to the faucet mounting portion 23, which will be described later, protrudes outward in the radial direction. At the end of the outer cylinder member 22A on the negative direction side of the Z axis, a bottom surface portion 22c through which a through hole 22a (liquid inlet) is penetrated is formed in the central portion.
_{The through hole 22a allows water W 0} supplied from the faucet 20 to flow into the shower faucet 21. The inner diameter d10 of the through hole 22a is smaller than the inner diameter of the pipe of the faucet 20.

The rubber packing 27 is formed in an annular shape in contact with the tip end portion of the faucet 20 and the end portion of the inner cylinder member 22B screwed to the outer cylinder member 22A on the negative direction side of the Z axis. The inner diameter of the through hole 27a penetrating the central portion of the rubber packing 27 is smaller than the inner diameter of the pipe line of the faucet 20, and is equal to or larger than the inner diameter of the through hole 22a.
The rubber packing 27 is a sealing member that seals the faucet 20 and the shower faucet 21 in an airtight and liquidtight manner.

The faucet mounting portion 23 is a tubular member that houses the outer cylinder member 22A inside.
A fixing groove 23a for fixing the flange portion 22b of the outer cylinder member 22A is formed at the end portion of the faucet mounting portion 23 on the positive direction side of the Z axis. The fixing groove 23a and the flange portion 22b of the outer cylinder member 22A are airtightly and liquidtightly fixed to each other. The fixing method between the faucet mounting portion 23 and the outer cylinder member 22A is not particularly limited. For example, the faucet mounting portion 23 and the outer cylinder member 22A may be fixed by adhesion, fusion, insert molding, or the like.
In the faucet mounting portion 23, on the inner peripheral portion on the negative direction side of the Z axis, a stepped locking portion 23b for positioning the main body portion 25 in the axial direction, which will be described later, and a stepped shape for locking the O-ring 29 in a pressed state. The locking portion 23c of the above is formed.
The O-ring 29 is a sealing member for airtightly and liquid-tightly connecting the faucet mounting portion 23 and the main body portion 25 described later.

The swivel cylinder 24 includes a cylindrical portion 24a and a stationary blade 24c.
The cylindrical portion 24a has a cylindrical inner peripheral surface 24b arranged coaxially with the central axis C. The inner diameter of the inner peripheral surface 24b is larger than the inner diameter of the through hole 22a of the outer cylinder member 22A.
The stationary blade 24c is a member that forms a _{rotary flow W 11} that rotates around the central axis C by _{the water W 0 that} flows in from the through hole 22a. The stationary blade 24c is arranged so that a plurality of plate-shaped blade portions are inclined in a certain direction with respect to a plane orthogonal to the central axis C. The shape of each of the stationary blades 24c is not particularly limited as long _{as a rotating flow W 11} that rotates in a certain direction when viewed in the negative direction of the Z axis _{can be formed from the water W 0 flowing along the central axis C.} The shape of each stationary blade 24c may be a flat surface or a curved surface.
In the following, as an example, the stationary blade 24c will be described with an example of forming _{a rotary flow W 11 that rotates clockwise when viewed in the negative direction of the Z axis.}
The rotary flow W ₁₁ flows in the negative direction of the Z axis while rotating clockwise when viewed in the negative direction of the Z axis inside the inner peripheral surface 24b. The rotary flow W ₁₁ spirals in the negative direction of the Z axis inside the inner peripheral surface 24b.

The main body portion 25 is a substantially cylindrical member that constitutes an outer shape on the negative direction side of the Z axis with respect to the faucet mounting portion 23 in the axial direction of the shower faucet 21. The main body portion 25 includes a first tubular portion 25e, a second tubular portion 25f, and a third tubular portion 25g from the Z-axis positive direction side to the Z-axis negative direction side.
The first tubular portion 25e fits inside the faucet mounting portion 23 from the negative direction side of the Z axis. A swivel cylinder 24 inserted from the positive direction side of the Z axis is fixed to the inner peripheral portion of the first tubular portion 25e.

The second tubular portion 25f is a cylindrical member having a larger diameter than the first tubular portion 25e. A stepped locking portion 25h for locking the O-ring 29 is formed at the boundary between the first tubular portion 25e and the second tubular portion 25f. The second tubular portion 25f has an outer diameter that can be inserted into the inner peripheral surface on the negative direction side of the Z axis with respect to the locking portion 23c in the faucet mounting portion 23.
The distance between the tip of the first tubular portion 25e and the locking portion 25h is between the locking portion 23c and the locking portion 25h when the first tubular portion 25e is locked to the locking portion 23b. The O-ring 29 is set to be properly compressed by the gap.
In the second tubular portion 25f, a fixing hole 25c to which the shaft portion 3b of the opening plug 3 can be fixed is penetrated on the side surface on the positive direction side of the Y-axis.

The third tubular portion 25g is a cylindrical member having a diameter larger than that of the second tubular portion 25f. A sprinkler plate 28, which will be described later, is inserted and fixed in the opening on the negative direction side of the Z axis in the third tubular portion 25 g.

A reduced diameter portion 25i and a tubular portion 25j are provided inside the main body portion 25.
The reduced diameter portion 25i is formed in a cone shape having a tapered surface 25a whose diameter is gradually reduced from the end portion of the second cylindrical portion 25f on the positive direction side of the Z axis toward the negative direction of the Z axis. ing.
The tubular portion 25j projects radially outward from the surface of the reduced diameter portion 25i on the negative direction side of the Z axis. The outer peripheral surface of the tubular portion 25j is composed of a cylindrical surface coaxial with the central axis C. The outer diameter of the outer peripheral surface of the tubular portion 25j is smaller than the inner diameter of the second tubular portion 25f.
The end face of the tubular portion 25j in the negative direction of the Z axis is composed of a flat surface portion 25d which is a plane orthogonal to the central axis C.
A tapered surface 25a of the reduced diameter portion 25i extends on the inner peripheral side of the tubular portion 25j. A liquid injection port 25b formed of a cylindrical surface that smoothly connects to the tapered surface 25a is formed on the inner peripheral side of the end portion of the tubular portion 25j on the negative direction side of the Z axis.
The inner diameter d11 of the liquid injection port 25b is determined according to the inner diameter d10 of the through hole 22a so that the flow velocity of the _{rotary flow W 11 passing through the liquid injection port 25b becomes appropriate.}

The partition plate 26 is a substantially disk-shaped member arranged along a plane orthogonal to the central axis C inside the end portion of the second cylindrical portion 25f on the negative direction side of the Z axis. The partition plate 26 has a first plate surface 26a and a second plate surface 26b. The first plate surface 26a is a plane orthogonal to the central axis C and oriented in the negative direction of the Z axis. The second plate surface 26b is a plane orthogonal to the central axis C and oriented in the positive direction of the Z axis.
The outer peripheral portion of the partition plate 26 is airtightly and liquidtightly fixed to the inner peripheral surface of the second tubular portion 25f. Examples of the fixing method between the partition plate 26 and the second tubular portion 25f include press-fitting, bonding, and fusion.
In the central portion of the second plate surface 26b, the tubular protrusion 26c is projected at a position facing the tubular portion 25j of the second tubular portion 25f. The end face 26e in the positive direction of the Z axis in the tubular protrusion 26c is a plane orthogonal to the central axis C.
In the central portion of the partition plate 26 including the tubular protrusion 26c, an enlarged inner peripheral surface 26d whose diameter increases toward the negative direction of the Z axis penetrates in the plate thickness direction. The central axis of the enlarged inner peripheral surface 26d is coaxial with the central axis C.
The inner diameter of the enlarged inner peripheral surface 26d at the end surface 26e of the tubular protrusion 26c is larger than the inner diameter d11 of the liquid injection port 25b. Therefore, when viewed in the positive direction of the Z axis, an annular stepped portion 25k in which the flat surface portion 25d on the outer periphery of the liquid injection port 25b is exposed is formed inside the enlarged inner peripheral surface 26d.
At the center of the first plate surface 26a, a circular injection port 26f (first injection port) is formed by the enlarged inner peripheral surface 26d.
A gap S (gas outlet) is formed between the end face 26e and the tubular portion 25j over the entire circumference of the end face 26e. The opening area of the gap S at the position of the inner edge of the end surface 26e is larger than the opening area of the through hole 3f of the opening plug 3.

The opening plug 3 is configured in the same manner as in the first embodiment. However, the opening plug 3 of the present embodiment is airtightly and liquidtightly fixed to the fixing hole 25c in a state where the shaft portion 3b is inserted into the fixing hole 25c of the second tubular portion 25f from the outside. The fixing method between the shaft portion 3b and the fixing hole 25c is not particularly limited as long as it can be fixed in an airtight and liquid-tight manner. For example, the shaft portion 3b and the fixing hole 25c may be fixed by press fitting, adhesion, or the like. For example, the shaft portion 3b and the fixing hole 25c may be fixed in an airtight and liquidtight manner by using a concavo-convex fitting such as screwing and a sealing member (not shown) in combination.
In a state where the opening plug 3 is fixed to the second tubular portion 25f, at least the dustproof filter 9 is exposed to the outside of the disk portion 3a.

The sprinkler plate 28 includes a plate-shaped portion 28b, a side surface portion 28e, and a dispersion member 28c.
The plate-shaped portion 28b (second nozzle portion) is a disk member capable of covering the opening on the negative side of the Z axis of the third cylindrical portion 25 g. The plate-shaped portion 28b is arranged so as to face the partition plate 26 with a gap open in the Z-axis direction.
As shown in FIG. 12, in the plate-shaped portion 28b, on the outer peripheral side of the dispersion member 28c described later, a large number of outlet nozzles 28a for injecting a gas-liquid mixed flow formed inside the shower faucet 21 to the outside. (Second injection port) is penetrated.
As the configuration of the outlet nozzle 28a, the same configuration as the outlet nozzle 4a in the first embodiment is used.

As shown in FIG. 11, the side surface portion 28e extends in the positive direction of the Z axis from the outer edge of the plate-shaped portion 28b. The side surface portion 28e is airtightly and liquidtightly fixed to the inner peripheral surface of the third tubular portion 25g. The method of fixing the side surface portion 28e to the inner peripheral surface of the third tubular portion 25g is not particularly limited as long as it can be fixed airtightly and liquidtightly. For example, the side surface portion 28e and the inner peripheral surface of the third tubular portion 25g may be fixed by press fitting, adhesion, or the like. For example, the side surface portion 28e and the inner peripheral surface of the third tubular portion 25g are airtightly and liquidtightly fixed by the combined use of uneven fitting such as screwing and a sealing member (not shown). May be good.

The dispersion member 28c is composed of a truncated cone-shaped protrusion protruding in the positive direction of the Z axis from the central portion of the plate-shaped portion 28b. The central axis of the dispersion member 28c is coaxial with the central axis C.
A flat surface portion 28d orthogonal to the central axis C is formed at the tip of the dispersion member 28c in the protruding direction. The diameter d12 of the flat surface portion 28d is larger than the inner diameter d11 of the liquid injection port 25b and smaller than the inner diameter of the injection port 26f. Therefore, a substantially cone-shaped flow path is formed between the dispersion member 28c and the enlarged inner peripheral surface 26d of the partition plate 26.
Further, the gas-liquid mixed flow injected from the injection port 26f, which will be described later, collides with the flat surface portion 28d and then flows along the inclination of the side surface of the dispersion member 28c.
Similar to the dispersion plate 8 in the first embodiment, the dispersion member 28c has an action of crushing bubbles by an impact force when a gas-liquid mixed flow collides. The diameter d12 of the flat surface portion 28d and the distance H between the flat surface portion 28d and the injection port 26f in the dispersion member 28c are appropriately set according to the required bubble diameter distribution of the gas-liquid mixed flow.
Further, the diameter d12 of the flat surface portion 28d is set so that the gas-liquid mixed flow can be dispersed in a range of radiation angles suitable for the use of the shower faucet 21.
For example, the distance H is more preferably 2.5 mm or more and 3.5 mm or less in order to make the bubble diameter distribution of bubbles bimodal so that the cleaning effect is particularly high.

In the shower faucet 21 having such a configuration, a rotary flow forming path for forming the _{rotary flow W 11} is formed inside the inner peripheral surface 24b of the swivel cylinder 24.
A first nozzle portion is formed on the Z-axis negative direction side of the rotation flow forming path by a tapered surface 25a, a liquid injection port 25b, and a diameter-expanded inner peripheral surface 26d. The first nozzle portion is connected to the rotating flow forming passage airtight, accelerating the rotational flow W _11, is injected from the injection port 26f provided a rotating flow W ₁₁ to the central axis C coaxial.
In the first nozzle portion of the present embodiment, the rotary flow W ₁₁ rotates and flows along the tapered surface 25a, so that the rotary flow W 11 passes through the liquid injection port 25b in a state where the flow velocity is gradually increased. _{At this time, since a negative pressure is generated by the rotary flow W 11} passing through the liquid injection port 25b, the vicinity of the stepped portion 25k is a negative pressure forming region.
The outer periphery of the first nozzle portion has a substantially cylindrical shape surrounded by a second tubular portion 25f, a reduced diameter portion 25i, a tubular portion 25j, a tubular protrusion 26c, and a second plate surface 26b of the partition plate 26. A gas introduction chamber of 25 m is formed.
The gas introduction chamber 25m is an airtight and liquidtight space except for the through hole 3f (see FIG. 5), which is a gas inflow port that opens to the outside, and the gap S that opens facing the negative pressure forming region. Therefore, the gap S that opens in the vicinity of the stepped portion 25k is a gas outlet through which the air G in the gas introduction chamber 25m flows out toward the first nozzle.

Next, the operation of the shower faucet 21 will be described focusing on the differences from the first embodiment.
As shown in FIG. 11, in the shower faucet 21, when the pressurized water W ₀ is injected from the faucet faucet 20 attached via the faucet fixture 22, the outlet nozzle 28a is as follows. The gas-liquid mixed flow W ₁₄ is jetted from.
_{The water W 0} injected from the faucet 20 enters the central portion of the swivel cylinder 24 through the through hole 22a. The water W ₀ collides with the stationary blade 24c and flows along the stationary blade 24c, so that the water W 0 changes to _{a rotating flow W 11 that rotates clockwise when viewed in the negative direction of the Z axis.} And impact force upon impact with the stationary blade 24c, and the stirring effect due to clash water flow after passing through stationary blade 24c, by, as in the first embodiment, the Yu away residual chlorine is reduced, pH is To rise.

The flow velocity of the rotary flow W ₁₁ is accelerated by rotating along the tapered surface 25a in the first nozzle portion. The rotary flow W ₁₁ is injected from the liquid injection port 25b into the inside of the enlarged inner peripheral surface 26d. At this time, since a negative pressure is formed in the vicinity of the stepped portion 25k, the air G in the gas introduction chamber 25m is sucked from the gap S. Air G is supplied to the decompressed gas introduction chamber 25 m from the through hole 3f of the air supply pipe 3B that opens to the outside.

Therefore, inside the enlarged inner peripheral surface 26d, the rotary flow W ₁₁ and the air G are mixed to form the gas-liquid mixed flow W ₁₂ . _{It is conceivable that a part of the rotary flow W 11} is scattered outward in the radial direction when the air G is mixed, but since the gap S is open over the entire circumference of the stepped portion 25k, the gap S is caused by the scattered water. S is not blocked. Therefore, the inflow of air G is not delayed.
The gas-liquid mixed flow W ₁₂ thus formed flows in the negative direction of the Z axis while rotating around the central axis C.
In the present embodiment, the same through hole 3f as in the first embodiment is used as the gas inlet of the air G, so that the bubbles contained in the _{gas-liquid mixed flow W 12 are the first embodiment.} it is the same as of the bubble and the gas-liquid mixture flow W ₃ in.

Gas-liquid mixed flow _{W 3} injected from the injection port 26f collides with the flat portion 28d of the dispersion member 28c that faces the injection port 26f. Thus, in the same manner as in the first embodiment, the gas-liquid mixed flow W _12, the gas-liquid mixed flow W ₁₃ is a gas-liquid mixed flow W ₁₂ having different bubble diameter distribution is formed.
The gas-liquid mixed flow W ₁₃ passes through the outlet nozzle 28a in the plate-shaped portion 28b from the outer peripheral portion of the dispersion member 28c, from the space surrounded by the partition plate 26, the third tubular portion 25 g, and the sprinkler plate 28, and the gas-liquid mixture. It is injected to the outside as a mixed flow W _14. At this time, as in the first embodiment, the radiation angle from the outlet nozzle 28a changes depending on the size of the diameter d12 of the flat surface portion 28d of the dispersion member 28c.
For example, when the shower faucet 21 is used for dishwashing, it is more preferable that the gas-liquid mixed flow is radiated straight. Therefore, it is more preferable that the spread angle of the gas-liquid mixed flow W _{14 in the cross section including the central axis C is approximately 0 °.}

Since the flow path from the outer peripheral portion of the dispersion member 28c to the outlet nozzle 28a has a wider flow path cross-sectional area than the flow path between the enlarged inner peripheral surface 26d and the dispersion member 28c, the interaction between bubbles is more favorable. Less. Therefore, the gas-liquid mixed flow W ₁₄ does not change much from the bubble diameter distribution of the gas-liquid mixed flow W _13.

As described above, according to the shower faucet 21 of the present embodiment, it is the same as the first embodiment except that the direction of introducing the air G into the _{rotary flow W 11 is orthogonal to the central axis C.} Similarly, it includes a rotary flow forming path, a first nozzle portion, a gas introduction chamber, a dispersion member, and a second nozzle portion. Therefore, the bubble diameter distribution of the gas-liquid mixed flow W ₁₄ ejected from the shower faucet 21 also has the same bimodal property as that of the first embodiment.
Further, according to the shower faucet 21, the gas introduction chamber 25 m is provided with a gas inflow port by an opening plug 3 similar to that of the first embodiment. Therefore, by appropriately setting the diameter d12 of the flat surface portion 28d in the dispersion member 28c and the distance H between the flat surface portion 28d and the injection port 26f, the gas-liquid mixed flow W ₁₄ can be combined with the first embodiment. Similarly, a _{first bubble group B m} containing a large amount of the first type _{bubble and a second bubble group B t} containing a large amount of the second type bubble can be included.

As described above, the gas-liquid mixed flow W ₁₄ ejected from the shower faucet 21 has a _{first bubble group B m} containing a large amount of type 1 bubbles and a second bubble group B containing a large amount of type 2 bubbles. _t and are mixed. Therefore, the shower faucet 21 is a mixed bubble generator in which a first-class bubble and a second-class bubble are mixed. It is more preferable that the bubbles contained in the gas-liquid mixed flow W ₁₄ are composed of type 1 bubbles and type 2 bubbles.

As described above, since the shower faucet 21 of the present embodiment is the same mixing bubble generator as that of the first embodiment, the gas-liquid mixed flow containing bubbles having a high cleaning effect can be stably performed. It can be easily formed.

In the description of each of the above embodiments, the case where the gas inlet in the gas introduction chamber is formed by the air supply pipe 3B provided in the opening plug 3 has been described. With such a configuration, it becomes easy to form a gas inlet having a small diameter for forming a required bubble diameter. Further, when manufacturing various mixed bubble generators having different bubble diameter distributions, it is possible to standardize parts other than the air supply pipe 3B of the opening plug 3.
However, if a gas inlet having a required inner diameter can be easily formed, the gas inlet may be formed by forming a through hole in the main body portions 2 and 25 in each of the above embodiments. Specifically, for example, a gas inlet may be formed by milling the main bodies 2 and 25. In this case, since the number of parts can be reduced, the cost of the mixing bubble generator can be reduced.

In the description of each of the above embodiments, the case where the air supply pipe 3B is press-fitted into the holder 3A has been described. However, when the holder 3A is manufactured by resin molding, the air supply pipe 3B is fixed to the holder 3A by insert molding. May be good.

In the description of each of the above embodiments, the case where the mixing bubble generator is a shower head and a shower faucet has been described. However, the mixing bubble generator may be used as part of a device or mechanical system of appropriate use that can use a gas-liquid multiphase flow having a bimodal bubble diameter distribution. For example, examples of the device or mechanical system suitable for the mixing bubble generator include a semiconductor cleaning device, a pollen countermeasure cleaning device, an infant cleaning device, and the like.
Furthermore, the use of the mixing bubble generator is not limited to the cleaning device. For example, the mixing bubble generator may be used as a water supply device in a mechanical system that promotes plant growth.

In the description of each of the above embodiments, the case where the inner diameter of the gas inlet is constant has been described, but the inner diameter of the gas inlet may be changed in the longitudinal direction. In this case, the inner diameter suitable for the gas inlet described above is applied to the minimum inner diameter of the gas inlet.

In the description of the first embodiment, as the plurality of inflow openings provided in the rotary flow forming path, the inflow openings 5b and 5c formed by penetrating through holes at positions that are 180 ° rotationally symmetric with respect to the central axis of the outer cylinder portion 5a. Has been described in the example of having. In this case, the inflow openings 5b and 5c are in a positional relationship facing each other with the central axis O in between.
However, the plurality of inflow openings provided in the rotary flow forming path are not limited to two locations, and may be provided at three or more locations separated in the circumferential direction with respect to the first axis.

In the description of the first embodiment, the case where the flow path from the liquid inlet to the rotary flow forming path is a spiral flow path around the first axis has been described. In this case, the liquid flows through the spiral flow path, so that the liquid is pre-rotated in the same direction as the rotation direction in the rotation flow forming path. Due to such preliminary rotation, the liquid flowing into the rotary flow forming path increases the velocity component in the circumferential direction with respect to the first axis, so that the flow velocity of the rotary flow can be increased.
However, if the required rotational flow velocity can be obtained without performing preliminary rotation, preliminary rotation is not necessary.
For example, in the shower head 1, _{a flow path may be formed in which water W 0} directly flows into the inflow openings 5b and 5c from the inflow port 2c. _{In this case, since a velocity component in the circumferential direction is generated in the water W 0} according to the inclination angle of the inflow openings 5b and 5c, a rotational flow can be formed in the swirl cylinder 5.
Further, the second embodiment is an example in which a rotational flow is formed without performing preliminary rotation.

In the description of the first embodiment, the flow path cross-sectional area of the second flow path 2e is constant, and the flow path cross-sectional area of the entire second flow path 2e is compared with the flow path cross-sectional area of the opening 2n. , I explained with the example of the small case.
However, at a site facing the inlet opening 5b, 5c in the second passage 2e, the flow rate of the water W _0, respectively, it is sufficient that faster than the flow velocity at the opening 2n.
For example, the flow path cross-sectional area of the second flow path 2e may gradually decrease from the connection portion with the first flow path 2d toward the end of the second flow path 2e. In this case, the flow velocity of the portion facing the inflow opening 5b is higher than the flow velocity of the portion facing the inflow opening 5c.
For example, the flow path cross-sectional area of the second flow path 2e gradually decreases from the connection portion with the first flow path 2d to the portion facing the inflow opening 5c, and from the portion facing the inflow opening 5c to the second flow path 2e. The cross-sectional area of the flow path may be constant toward the end. In this case, the flow velocity of the portion facing the inflow opening 5c and the flow velocity of the portion facing the inflow opening 5b are equal when the speed decrease due to the flow path resistance is negligible.
Further, the cross section of the flow path of the first flow path 2d may also gradually decrease from the opening 2n toward the connection portion with the second flow path 2e.

In the description of the first embodiment, the case where the flow path cross-sectional areas of the first flow path 2d and the second flow path 2e are changed by the respective groove widths has been described.
However, the flow path cross-sectional areas in the first flow path 2d and the second flow path 2e may be changed depending on the depth of the groove portion. The flow path cross-sectional area in the first flow path 2d and the second flow path 2e may be changed by the groove width of the groove portion and the depth of the groove portion.

Although the preferred embodiment of the present invention has been described above, the present invention is not limited to this embodiment. It is possible to add, omit, replace, and make other changes to the configuration without departing from the spirit of the present invention.
Further, the present invention is not limited by the above description, but is limited only by the appended claims.

1 Shower head (mixed bubble generator)
2,25 Main body 2a Water injection pipeline 2A Head 2b Spiral partition wall 2c Inflow port (liquid inlet)
2d 1st flow path 2e 2nd flow path 3 Opening plug 3B Air supply pipe 3f Through hole (gas inlet)
3g Outlet 3h Intake port 4 Outlet caps 4a, 28a Outlet nozzle (second injection port)
4b, 28b Plate-shaped part (second nozzle part)
5, 24 Swivel cylinder 5a Outer cylinder 5b, 5c Inflow opening 5d Inner cylinder (first nozzle)
5h hollow part (gas introduction chamber)
5i Cylindrical flow path (rotary flow formation path)
5j Reduced diameter flow path 5k Gas outlet 5q Gap part 5r Circular flow path 6A, 6B, 29 O-ring 7,26 Partition plate 7b Tapered part (first nozzle part)
7c injection port (first injection port, first nozzle part)
8 Dispersion plate (dispersion member)
9 Dustproof filters 11, 27 Rubber packing 20 Faucet 21 Shower faucet (mixing bubble generator)
22 Faucet fixture 22a Through hole (liquid inlet)
23 Faucet mounting part 24c Static blade 25a Tapered surface (first nozzle part)
25b Liquid injection port (first nozzle)
25d Flat surface part 25f Second cylindrical part 25g Third tubular part 25i Reduced diameter part 25j Tubular part 25k Stepped part 25m Gas introduction chamber 26c Tubular protrusion 26d Enlarged diameter inner peripheral surface (first nozzle part)
26e End face 26f Injection port (first injection port)
28 Sprinkler plate 28c Dispersion member 28d Flat surface 50 Cleaning object 51 Dirt b _m First bubble B _m First bubble group b _t Second bubble B _t Second bubble group C, O Central axis (first) Axis)
G air (liquid)
S gap (gas outlet)
W _0, W _1b , W _1c Water (liquid)
W ₂ , W ₁₁ rotary flow W ₃ , W ₄ , W ₅ , W ₁₂ , W ₁₃ , W ₁₄ gas-liquid mixed flow

Claims (5)

A liquid inlet that allows pressurized liquid to flow in, and
A rotary flow forming path that is airtightly connected to the liquid inlet and forms a rotary flow that is rotated around the first axis by the liquid that has flowed in from the liquid inlet.
A first nozzle portion that is airtightly connected to the rotary flow forming path, accelerates the rotary flow, and injects the rotary flow from a first injection port provided coaxially with the first axis.
A gas introduction chamber that airtightly connects a gas inlet into which a gas flows and a gas outlet arranged facing a negative pressure forming region due to the rotary flow accelerated by the first nozzle portion.
The gas-liquid mixed flow is arranged so as to face the first injection port so that the gas-liquid mixed flow in which the gas flowing out from the gas outlet is mixed collides with the rotating flow. With a dispersion member that disperses the gas in the radial direction with respect to the first axis.
A second nozzle portion having a second injection port for injecting the gas-liquid mixed flow dispersed by the dispersion member to the outside, and a second nozzle portion.
Equipped with
The minimum value of the inner diameter of the gas inlet is 0.20 mm or more and 0.30 mm or less.
Foam size distribution of the gas-liquid mixed flow jetted from the second nozzle portion is to have a bimodal,
The bubble diameter distribution is
The first predominant peak at the first foam diameter, in which a stable foam diameter is maintained while confined in the liquid,
The second predominant peak at the second bubble diameter, which is larger than the first bubble diameter and has a larger sonic vibration energy,
Have and
The first bubble diameter is 5 μm or more and 50 μm or less.
The second bubble diameter is 0.18 mm or more and 0.68 mm or less.
Mixed bubble generator. The flow path of the liquid from the liquid inlet to the rotary flow forming path is formed in a plurality of spirals around the first axis, which is more than one round.
The mixed bubble generator according to claim 1. The bubble diameter distribution is
The sum of the number of bubbles having a bubble diameter of 5 μm or more and 50 μm or less and the number of bubbles having a bubble diameter of 0.18 mm or more and 0.68 mm or less occupies 80% or more of the whole.
The mixed bubble generator according to claim 1 or 2. The flow path cross-sectional area of the liquid flow path from the liquid inlet to the rotary flow forming path is to the rotary flow forming path as compared with the flow path cross-sectional area at the end near the liquid inflow port. The cross-sectional area of the flow path at the part facing the entrance is smaller,
The mixed bubble generator according to any one of claims 1 to 3. The rotary flow forming path is
A plurality of inflow openings for flowing the liquid flowing in from the liquid inlet at different positions in the circumferential direction with respect to the first axis are provided.
The mixed bubble generator according to any one of claims 1 to 4.

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