JP2019000837A - Mixed bubble generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably and easily form a gas-liquid mixed flow containing bubbles having a high cleaning effect in a mixing bubble generator. SOLUTION: A shower head 1 has an inflow port portion 2c, a rotary flow forming path forming a rotary flow rotating around a central axis O by water W0, and a first nozzle portion for injecting the rotary flow from an injection port 7c. A gas introduction chamber that airtly connects the gas inlet and the gas outlet arranged facing the negative pressure formation region due to the rotary flow, and a state in which the gas flowing out from the gas outlet is mixed in the rotary flow. The dispersion plate 8 is arranged so as to face the injection port 7c so that the gas-liquid mixed flow collides with each other and disperses the gas-liquid mixed flow, and the gas-liquid mixed flow dispersed by the dispersion plate 8 is injected to the outside. A plate-shaped portion 4b having an outlet nozzle 4a and a plate-shaped portion 4b are provided, and the bubble diameter distribution of the gas-liquid mixed flow ejected from the plate-shaped portion 4b is bimodal. [Selection diagram] Fig. 3

Description

  The present invention relates to a mixed bubble generator.

2. Description of the Related Art A cleaning device is known that includes a faucet that performs cleaning by jetting a fluid in which bubbles are mixed into a cleaning target, a bubble shower, and the like.
For example, Patent Document 1 describes a scrubber that includes two air introduction passages and that forms air-water mixed flows having different bubble diameters by switching the air introduction passage system using an operation lever.

Utility Model Registration No. 3190442

However, the prior art as described above has the following problems.
According to the technique described in Patent Document 1, it is necessary to select a bubble diameter by an operation lever when performing cleaning. For this reason, the user has to switch the operation lever according to the contamination of the object to be cleaned.
Patent Document 1 discloses that bubbles having a bubble diameter of “0.18 to 0.68 mm” “vibrates vigorously and overcomes the viscosity of water, and its vibration energy is very strong”. It is described that bubbles are confined and solidified by the viscosity of water, and in water, vibrations and levitation effects, which are the characteristics of bubbles, are suppressed, and they become almost stationary.
On the other hand, Patent Document 1 describes “the purpose of removing dirt and foreign matters adhering to the surface for washing food such as vegetables and fruits”. However, in the above description of Patent Document 1, it is unclear how the air / water mixed flow having a small bubble diameter cleans the dirt and foreign matter.
For this reason, since it is necessary for the user to switch the operation lever by trial and error each time cleaning is performed, the cleaning device is inconvenient.

  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 two types of bubble diameters by switching the operation lever. It turned out to be difficult.

  Thus, there is a strong demand for a cleaning apparatus that can stably and easily form a gas-liquid mixed flow containing bubbles having a high cleaning effect. As a result of intensive studies by the present inventors, it has been found that a gas-liquid mixed flow having a high cleaning effect is a gas-liquid mixed flow including at least two types of bubbles having different cleaning characteristics due to different bubble diameters. is there.

  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-described problems, a mixed bubble generator according to an aspect of the present invention is connected to a liquid inlet through which a pressurized liquid is introduced, and the liquid inlet is airtightly connected to the liquid inlet. A rotating flow forming path that forms a rotating flow that rotates around the first axis by the liquid, and is connected to the rotating flow forming path in an airtight manner, accelerates the rotating flow, and converts the rotating flow to the first axis. A first nozzle portion that is injected from a first injection port provided coaxially, a gas inflow port through which gas flows, and a negative pressure formation region due to the rotational flow accelerated by the first nozzle portion. A gas inlet chamber connected in a gas-tight manner, and a gas-liquid mixed flow in which the gas flowing out from the gas outlet is mixed with the rotating flow, Arranged to face the first injection port A second nozzle having a dispersion member that disperses the gas-liquid mixed flow in a radial direction with respect to the first axis, and a second injection port that injects the gas-liquid mixed flow dispersed by the dispersion member to the outside. A bubble diameter distribution of the gas-liquid mixed flow ejected from the second nozzle portion has a bimodal property.

  In the mixed bubble generating device of the above aspect, the bubble diameter distribution includes a first dominant peak at a first bubble diameter at which a stable bubble diameter is maintained in a state confined in the liquid, and the first And a second dominant peak at a second bubble diameter that is larger than the bubble diameter and has greater sonic vibration energy.

  In the mixed bubble generator of the above aspect, the first bubble diameter may be 5 μm or more and 50 μm or less, and the second bubble diameter may be 0.18 mm or more and 0.68 mm or less.

  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. May account for 80% or more of the total.

  In the mixed bubble generating apparatus of the above aspect, the flow path cross-sectional area of the liquid flow path from the liquid inlet to the rotary flow forming path is equal to the flow path cross-sectional area at the end near the liquid inlet. In comparison, the cross-sectional area of the flow path at the portion facing the inlet to the rotational flow forming path may be smaller.

  In the mixed bubble generating device of the above aspect, the rotational flow forming path includes a plurality of inflow openings through which the liquid that has flowed in from the liquid inflow port is introduced at different positions in the circumferential direction with respect to the first axis. Also 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 typical top view showing an example of the mixed bubble generating device of a 1st embodiment of the present invention. It is a typical bottom view showing an example of the mixed bubble generating device of a 1st embodiment of the present invention. It is AA sectional drawing in FIG. It is a typical bottom view which shows an example of the rotational flow formation path in the mixed bubble generator of the 1st Embodiment of this invention. It is a typical longitudinal cross-sectional view which shows an example of the plug member of the gas introduction chamber in the mixed bubble generator of the 1st Embodiment of this invention. It is a typical fragmentary sectional view showing an example of the 2nd nozzle part in the mixed bubble generating device of a 1st embodiment of the present invention. It is a typical longitudinal cross-sectional view explaining the flow of the gas and liquid in the mixed bubble generator of the 1st Embodiment of this invention. It is a typical graph which shows an example of bubble diameter distribution of the gas-liquid mixed flow generated with the mixed bubble generator of the 1st Embodiment of this invention. It is a schematic diagram explaining the effect | action of the washing water containing a microbubble. It is a schematic diagram explaining the effect | action of the gas-liquid mixed flow in the mixed bubble generator of the 1st Embodiment of this invention. It is a typical longitudinal section showing an example of a mixed bubble generating device of a 2nd embodiment of the present invention. It is a B view in FIG.

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

[First Embodiment]
A mixed bubble generator according to a first embodiment of the present invention will be described.
FIG. 1 is a schematic plan view showing an example of the mixed bubble generator according to the first embodiment of the present invention. FIG. 2 is a schematic bottom view showing an example of the mixed bubble generator according to the first embodiment of the present invention. 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 mixed bubble generator according to the first embodiment of the present invention. FIG. 5 is a schematic longitudinal sectional view showing an example of a plug member of a gas introduction chamber in the mixed bubble generator according to the first embodiment of the present invention. FIG. 6 is a schematic partial cross-sectional view showing an example of the second nozzle portion in the mixed bubble generator of the first embodiment of the present invention.
In addition, since each drawing is a schematic diagram, the shape and dimension are exaggerated (the following drawings are also the same).

A shower head 1 (mixed bubble generator) of the present embodiment shown in FIG. 1 is connected to an appropriate pressurized liquid supply source such as a water pipe, for example, so that a gas-liquid containing micro bubbles and techno bubbles, which will be described later. Inject the mixed flow. For example, the shower head 1 may be installed in a bathroom or the like, or connected 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. Hereinafter, as an example, the liquid component is water and the gas component is air.

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

As shown in FIG. 1, a water injection pipe 2a through which water W ₀ (liquid), which is a pressurized liquid, circulates 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 this embodiment, the water injection pipe 2a is connected to a hose (not shown) connected to the end of the grip 2B opposite to the head 2A. The hose not shown is connected to the water pipe via a valve that can be opened and closed by an appropriate operation lever, for example. For this reason, in the following description, as an example, the water W ₀ is assumed to be tap water. The water W ₀ may be warm water or cold water.

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

Below, when explaining each structural member of the shower head 1, unless otherwise indicated, it demonstrates based on arrangement | positioning in the assembly state shown in FIG.
Furthermore, in the description of the positional relationship between the constituent members, an XYZ orthogonal coordinate system shown in FIG. 3 may be referred to. In the XYZ orthogonal coordinate system, the Z axis is parallel to an axis extending from the center of the outlet cap 4 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 that is orthogonal to the Z-axis and the Y-axis and extends from the front of the paper toward the back of the paper. The positive direction in each axis is the extending direction of each axis as described above. The negative direction in each axis is the direction opposite to the positive direction.

A detailed configuration of the main body 2 will be described.
FIG. 4 shows a bottom view of the main body 2 in which the later-described revolving cylinder 5 is assembled in the positive Z-axis direction. As shown in FIG. 4, a cylindrical portion 2 i centering on the central axis O (first axis) protrudes in the Z-axis negative direction on the outer peripheral portion of the head portion 2A.
On the outer peripheral portion of the cylindrical portion 2i, an uneven fitting portion 2s for fitting with an outlet cap 4 described later is formed. For example, the concave / convex fitting portion 2s may be configured with a male screw or the like.
On the inner peripheral part of the cylindrical part 2i, a stepped locking part 2r is formed over the entire circumference. The locking portion 2r is configured by a plane orthogonal to the central axis O in order to lock an outer peripheral portion of a partition plate 7 (see FIG. 3) described later with a rubber packing 11 (see FIG. 3) described later interposed therebetween. .
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 a later-described partition plate 7 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, a stepped O-ring attachment portion 2t that protrudes radially outward is formed on the entire outer periphery of the cylindrical portion 2i on the positive side in the Z-axis direction relative to the concave-convex fitting portion 2s. .

An O-ring 6B is attached to the O-ring attachment portion 2t.
The O-ring 6B is a seal member that seals the gap between the main body 2 and the outlet cap 4 in an air-tight and liquid-tight manner by contacting the O-ring attachment portion 2t and an outlet cap 4 described later.
As the material of the O-ring 6B, a rubber material that does not interfere with the main body 2 and the outlet cap 4 is used.

Inside the cylindrical portion 2i and the locking portion 2r, an inlet 2c (liquid inlet) that is a hole extending in the Z-axis direction is formed at a portion facing the water injection pipe 2a. A water injection conduit 2a communicates with the end of the inflow port portion 2c on the Z axis positive direction side.
In the inflow port portion 2c, the inner peripheral surface on the Y axis positive direction side (the right side in FIG. 3) is formed by the outer peripheral surface of a spiral partition wall 2b described later.
As shown in FIG. 4, in the inlet portion 2c, the inner peripheral surface on the X axis negative direction side (the upper side in FIG. 4) is formed by the side wall portion 2m, and the inner peripheral surface on the X axis positive direction side is formed by the side wall portion 2k. , Each is formed.
As shown in FIG. 3, the height from the bottom face part 2h of the spiral-shaped partition wall 2b mentioned later and the side wall parts 2k and 2m is the same.
A rectangular opening 2n extending from the bottom surface 2h to the tip of the side wall 2k passes through the side wall 2k in the X-axis direction.

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

The outer peripheral edge P1 of the spiral partition wall 2b is connected to the edge on the opening 2n side in the side wall 2k. The spiral partition wall 2b is gradually reduced in diameter from the first intermediate portion P2, which is a position that is rotated about ¾ of the counterclockwise direction along the circumference centered on the central axis O. Yes. The spiral partition wall 2b is connected to the end portion of the side wall portion 2m in the positive Y-axis direction at the second intermediate portion P3. The spiral partition wall 2b extends from the second intermediate portion P3 so as to further rotate in the clockwise direction in the figure along a circumference centered on the central axis O. Thereby, the spiral partition wall 2b extending between the side wall portions 2m and 2k forms the side surface on the Y axis positive direction side in the inflow port portion 2c.
The opening 2n described above is formed between the end of the side wall 2k on the Y axis positive direction side and the spiral partition wall 2b in the third intermediate portion P4.
Further, the spiral partition wall 2b further includes an outer peripheral surface of the swivel cylinder 5 at a fourth intermediate portion P5 that is a position that is turned about ¾ of the counterclockwise direction along the circumference centered on the central axis O. It is bent toward 5m. The inner peripheral end P6 of the spiral partition wall 2b is in contact with the outer peripheral surface 5m of the swivel cylinder 5 without any gap.

By such a spiral partition wall 2b, 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 are formed. The first flow path 2d and the second flow path 2e constitute a liquid flow path from the liquid inflow port to a rotational flow forming path described later.
The first flow path 2d includes 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. , And sandwiched between.
The second flow path 2e is constituted by a spiral partition wall 2b from the second intermediate portion P3 to the outer peripheral end portion P6 and an outer peripheral surface 5m of the swivel cylinder 5 on the bottom surface portion 2h.
Each of the first flow path 2d and the second flow path 2e includes a groove portion that opens in the Z-axis negative direction.
In the present embodiment, the channel cross-sectional area in the second channel 2e is narrower than the channel cross-sectional area in the first channel 2d. Specifically, the groove width of the second flow path 2e is narrower than the groove width of the first flow path 2d. For this reason, in the flow path formed by the first flow path 2d and the second flow path 2e, compared to the flow path cross-sectional area of the end (opening 2n) near the inflow port portion 2c, the rotation flow forming path described later The flow path cross-sectional area of the second end facing the inlet (inflow openings 5b, 5b described later) is smaller.
Here, the channel cross-sectional area is a cross-sectional area in a cross section orthogonal to the liquid flow direction.

  Although the material of the main-body part 2 is not specifically limited, In this embodiment, the synthetic resin material is used as an example. The type of the 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 part 5g, an outer cylinder part 5a, and an inner cylinder part 5d.
The bottom surface portion 5g is formed in a disk shape with a circular hole passing through 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 protrudes.
The outer cylinder portion 5a is a cylindrical member that extends from the outer edge of the bottom surface portion 5g to the side opposite to the protruding direction of the fixing pin 5e along the central axis of the bottom surface portion 5g.
As shown in FIG. 4, in the outer cylinder part 5a, inflow openings 5b and 5c made of penetrating through holes are formed at positions that are 180 ° rotationally symmetric with respect to the central axis of the outer cylinder part 5a.
As shown in FIG. 3, the inner cylinder part 5d is a cylindrical member that extends in the same direction as the outer cylinder part 5a from the inner edge of the circular hole of the bottom part 5g along the central axis of the bottom part 5g. For this reason, the outer diameter of the inner cylinder part 5d is smaller than the inner diameter of the outer cylinder part 5a. The height of the inner cylinder part 5d from the bottom face part 5g is higher than the height of the outer cylinder part 5a from the bottom face part 5g. For this reason, the front-end | tip part of the inner cylinder part 5d protrudes outside the front-end | tip surface 5n of the outer cylinder part 5a in the axial direction.
A hollow portion 5h (gas introduction chamber) that penetrates the entire swivel tube 5 along the central axis of the swirl tube 5 is formed inside the inner tube portion 5d.

As shown in FIG. 3, the end portion on the Z axis positive direction side of the swivel cylinder 5 is fitted into the recess 2p of the main body 2 with the O-ring 6A sandwiched between the bottom surface 5g and the recess 2p. ing. The fixing pin 5 e of the swivel cylinder 5 is engaged with the engagement hole 2 q in the main body 2. Thereby, the turning cylinder 5 is positioned around the central axis O.
The O-ring 6A is a seal member that seals the gap between the main body 2 and the bottom surface 5g in an airtight and liquid-tight manner by contacting the main body 2 and the bottom surface 5g.
In this specification, “air-tight and liquid-tight” means a positive pressure or a negative pressure that can be generated by a liquid flow, a gas flow, and a gas-liquid mixed flow flowing inside the mixed bubble generating device when the mixed bubble generating device is used. Means airtight and liquid-tight.
As the material of the O-ring 6A, a rubber material that does not interfere 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 engagement hole 2q and fitted into the recess 2p, the central axis of the swivel cylinder 5 is coaxial with the central axis O. Furthermore, the front end surface 5n of the outer cylinder part 5a is located on the same plane as the front end part 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 in the assembled state, as shown in FIG. It is the position which becomes 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 to 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 opens at a substantially central portion of 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 The direction is inclined in the turning 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 3 </ b> A, an air supply pipe 3 </ b> B, and a dust 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 dust 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 housing portion 3c, which is a circular hole in which a dustproof filter 9 described later is disposed, is formed. A concave portion 3d coaxial with the filter housing portion 3c is formed in the hole bottom of the filter housing portion 3c. The inner diameter of the recess 3d is smaller than the inner diameter of the filter housing portion 3c and larger than the outer diameter of the air supply pipe 3B described later. The bottom of the recess 3d enters the shaft 3b.

The outer shape of the shaft portion 3b is a cylindrical shape coaxial with the disc portion 3a. A part of the concave portion 3d penetrates the center of the end portion (illustrated upper end portion) of the shaft portion 3b connected to the disc portion 3a. An attachment hole 3e, which is a cylindrical hole coaxial with the recess 3d, passes through the bottom of the recess 3d in the axial direction. The inner diameter of the attachment hole 3e is smaller than the inner diameter of the recess 3d. The inner diameter of the mounting hole 3e has a dimension capable of press-fitting the air supply pipe 3B.
As a material of the holder 3A, a synthetic resin material similar to that of the main body 2 may be used.

The air supply pipe 3 </ b> B is provided to allow external air to flow into the shower head 1.
The air supply pipe 3B is configured by a cylindrical pipe having a through hole 3f (gas inlet) having an inner diameter d1 at the center. The outer diameter of the air supply pipe 3B has a dimension capable of being press-fitted into the attachment 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 supply pipe 3B is approximately 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 the shaft portion 3b as long as the necessary length for the through hole 3f is secured. If the supply pipe 3B is too short, assembly workability may be reduced in the manufacturing process.
The air supply pipe 3B in the present embodiment is press-fitted into the attachment hole 3e so that the first end portion (the lower side in the drawing) reaches the end portion on the opposite side of the disc portion 3a of the shaft portion 3b. For this reason, a circular exit port 3g having an inner diameter d1, which is an opening of the through hole 3f, is exposed at the end of the shaft portion 3b opposite to the disc portion 3a.
In this embodiment, the 2nd end part (illustration upper side) in the air supply pipe | tube 3B protrudes inside the recessed part 3d. Therefore, a circular suction port 3h having an inner diameter d1 that is an opening of the through hole 3f is exposed inside the recess 3d.
However, if the suction port 3h communicates with the recess 3d, the second end of the air supply pipe 3B may be disposed so as not to protrude into the recess 3d.
As described above, the supply pipe 3B is built in the shaft portion 3b, whereby the supply pipe 3B can be prevented from being bent or broken. However, the air supply pipe 3B may protrude from the shaft portion 3b as long as the air supply pipe 3B can be assembled to the shower head 1 without bending or breaking.

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 is 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 has bimodality. 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, each dominant peak has a first bubble diameter of 5 μm to 50 μm and 0.18 mm. More preferably, it appears in the second bubble diameter of 0.68 mm or less. For this reason, 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 the respective inner diameters 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 in a state of 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 terms of easy processing and excellent stability of the inner diameter d1. In particular, it is more preferable that a stainless steel pipe is used as the air supply pipe 3B in that rust is hardly generated even when it is in 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 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 or the like having a size that may block the suction port 3h.
Specific examples of the dust filter 9 include urethane foam and sintered metal.
A method for fixing the dust filter 9 to the filter housing 3c is not particularly limited.
For example, in the present embodiment, a locking projection 3i that forms an opening slightly narrower than the outer shape of the dustproof filter 9 is formed at the inner edge of the opening of the filter housing portion 3c in the disc portion 3a. The dustproof filter 9 is fitted into the filter housing 3c through the opening between the locking projections 3i and fixed. The dustproof filter 9 fitted in the filter housing portion 3c is prevented from coming off by the locking projection 3i.
Thus, it is more preferable that the dustproof filter 9 is fixed by fitting and fixing, because a part of the dustproof filter 9 is not clogged as in the case of being fixed by an adhesive or an adhesive.

As shown in FIG. 3, the opening plug 3 having such a configuration is airtight and liquid tightly fixed to the mounting hole 2 g in a state where the disc portion 3 a is exposed to the outside of the main body 2. In a state where the opening plug 3 is fixed, the emission port 3g is disposed on the central axis O and exposed to the hollow portion 5h.
The method for fixing the opening plug 3 to the attachment hole 2g is not particularly limited as long as the airtight and liquid tight states 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 liquid tight. 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 as an example.

For example, as a method for 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 tends to occur between the male screw and the female screw. Furthermore, the gap between the male screw and the female screw also varies depending on component variations and assembly variations. For this reason, the necessary airtight state cannot often be obtained by fixing by screwing. If the required airtight state cannot be obtained, the inner diameter d1 of the through hole 3f is apparently increased, and the bubble diameter distribution may change.
However, for example, the opening plug 3 may be fixed by screwing as long as a necessary airtight state can be stably obtained by using a seal member together.

As shown in FIG. 3, the partition plate 7 is formed in a substantially disc shape that covers the locking portion 2 r, the inlet port 2 c, the spiral partition wall 2 b, and the outer cylinder portion 5 a of the swivel cylinder 5 inside the cylindrical portion 2 i. 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 that is orthogonal to the central axis O and faces in the negative Z-axis direction. The second plate surface 7e is a plane that is orthogonal to the central axis O and faces in the positive direction of the Z axis.
An insertion projection 7a that fits into the inner peripheral part of the outer cylinder part 5a of the swivel cylinder 5 protrudes from the center of the second plate surface 7e.
In the central portion of the partition plate 7 including the insertion protrusion 7a, a through hole including an injection port 7c and a tapered portion 7b passes through the first plate surface 7d in the plate thickness direction.
The injection port 7 c is a circular hole extending from the first plate surface 7 d to the middle portion of the partition plate 7 in the plate thickness direction. The inner diameter of the injection port 7 c is larger than the outer diameter of the inner cylinder portion 5 d of the swivel cylinder 5.
The taper portion 7 b is configured by a tapered surface that gradually increases in diameter from an end portion of the injection port 7 c that extends into the partition plate 7.
Although not shown in FIG. 3, through-holes through which the tapping screws of the countersunk heads are respectively inserted at positions corresponding to the tap holes 2 f of the main body 2 on the outer peripheral side of the insertion projection 7 a in the partition plate 7. ing.

The partition plate 7 having such a configuration has an engaging portion 2r, an inflow port portion 2c, a spiral partition wall 2b, and an outer cylinder of the swivel cylinder 5 with the rubber packing 11 stacked on the second plate surface 7e interposed therebetween. It arrange | positions so that the part 5a may be covered.
The rubber packing 11 may be provided separately from the partition plate 7, or may be formed on the second plate surface 7 e of the partition plate 7. The material of the rubber packing 11 is not particularly limited as long as necessary sealing performance can be obtained. For example, the rubber packing 11 may be made of natural rubber, silicon rubber or the like having excellent sealing properties and durability.
The partition plate 7 and the rubber packing 11 arranged in this manner are inserted into a through hole of the partition plate 7 (not shown) and fixed to the head portion 2A by a not-shown tap screw screwed into the tap hole 2f (see FIG. 4). The Thereby, since the rubber packing 11 is urged by the contact part with the latching | locking part 2r, the spiral partition wall 2b, and the outer cylinder part 5a, all the contact parts with the rubber packing 11 are airtight and watertight. It is.
For this reason, in the inflow port portion 2c, the first flow path 2d, and the second flow path 2e, the respective Z-axis negative direction side openings are closed in an airtight and watertight manner by the partition plate 7 and the rubber packing 11.
Furthermore, when the outer cylinder part 5a is pressed from the partition plate 7 via the rubber packing 11, the turning cylinder 5 is pressed against the recess 2p. Thereby, since the O-ring 6A is deformed, the space between the concave portion 2p and the bottom surface portion 5g is also airtight and watertight.
For this reason, between the 2nd flow path 2e and the hollow part 5h, it is prevented that a liquid or gas distribute | circulates between the recessed part 2p and the bottom face part 5g.

As shown in FIG. 3, in the state where the partition plate 7 is assembled, the tip of the inner cylinder portion 5d of the swivel cylinder 5 does not protrude from the injection port 7c in the negative Z-axis direction and is located inside the injection port 7c. Have entered the market.
A cylindrical flow path 5i (rotational flow forming path) is formed between the inner peripheral surface of the outer cylindrical portion 5a and the outer peripheral surface of the inner cylindrical portion 5d. A cross section perpendicular to the central axis O of the cylindrical flow path 5i (hereinafter referred to as a cross section perpendicular to the axis) is annular.
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 ring in the cross section perpendicular to the axis gradually decreases due to the gap between the tapered portion 7b and the outer peripheral surface of the inner cylindrical portion 5d. A path 5j is formed. Further, a gap portion between the injection port 7c and the outer peripheral surface of the inner cylinder portion 5d forms a slit portion 5q in which the cross-sectional area of the ring in the cross section perpendicular to the axis constitutes the minimum flow path.
A circular channel 5r having a circular cross section perpendicular to the axis is formed inside the injection port 7c in the negative direction of the Z-axis with respect to the tip 5p of the inner cylinder 5d.
The tapered diameter portion 5b, the narrow gap portion 5q, and the tapered portion 7b that forms the circular flow passage 5r, the inner cylinder portion 5d, and the injection port 7c are hermetically connected to the rotary flow forming passage, which will be described later. The first nozzle portion that accelerates the rotating flow W ₂ (see FIG. 7) and injects the rotating flow W ₂ from the injection port 7 c provided coaxially with the central axis O is configured.

On the first plate surface 7d of the partition plate 7, a decorative plate 10 is laminated in a range excluding the opening by the injection port 7c.
For example, the decorative plate 10 is provided so that the flow of the gas-liquid mixed flow, which will be described later, becomes smooth by leveling the unevenness of the surface generated by the screw head of the tapping screw, the insertion hole of the tapping screw, and the like. For example, a resin may be used as the material of the decorative board 10. As a fixing means for the decorative board 10, for example, an adhesive, a 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 an outlet cap 4 described later, the decorative plate 10 may be decorated with an appearance taken into consideration. For example, resin plating may be applied to the surface of the decorative board 10.

The outlet cap 4 includes a plate-like portion 4b and a side surface portion 4c.
The plate-like portion 4b (second nozzle portion) is a disc member that can cover the cylindrical portion 2i of the head portion 2A. The plate-like portion 4b is arranged to face the partition plate 7 with a gap opened in the Z-axis direction.
At the center of the plate-like portion 4b, a dispersion plate fixing portion 4d for fixing a dispersion plate 8 described later protrudes in the positive Z-axis direction. 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 Z-axis negative direction side. In this embodiment, as an example, it is configured by an annular boss (see FIG. 6) having a fitting hole at the center.

As shown in FIGS. 2 and 3, in the plate-like portion 4b, a plurality of outlets for injecting the gas-liquid mixed flow formed inside the shower head 1 to the outer side of the dispersion plate fixing portion 4d. The nozzle 4a (second injection port) is penetrated.
The cross-sectional diameter of each outlet nozzle 4a is gradually reduced toward the Z-axis negative direction. The minimum inner diameter of each outlet nozzle 4a may be 0.2 mm or greater and 1.0 mm or less. The minimum inner diameter of each outlet nozzle 4a is more preferably 0.5 mm or greater and 1.0 mm or less. More preferably, the minimum inner diameter of each outlet nozzle 4a is 0.7 mm or greater 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, even if the minimum inner diameter of the outlet nozzle 4a is smaller than the bubble diameter, not all are crushed. However, if the minimum inner diameter of the outlet nozzle 4a is too small, there is an increased possibility that bubbles contained in the gas-liquid mixed flow injected from the outlet nozzle 4a will be crushed during the injection. For this reason, it is more preferable that the minimum inner diameter of the outlet nozzle 4a is larger than the maximum diameter of 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 rate of the gas-liquid mixed flow injected from the outlet nozzle 4a becomes too low at the water pressure of tap water supplied for household use, resulting in a decrease in cleaning efficiency. There is a risk.

As shown in FIG. 3, the side surface portion 4c extends in the positive Z-axis direction from the outer edge of the plate-like portion 4b. A concave / convex fitting portion 4e that fits with the concave / convex fitting portion 2s formed on the outer peripheral portion of the cylindrical portion 2i is formed on the inner peripheral surface at the distal end portion in the extending direction of the side surface portion 4c. For example, the concave / convex fitting portion 4e may be configured with 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 constituted by a female screw, and the concave / convex fitting portion 4e may be constituted by a male screw.
A stepped O-ring presser 4f that presses the O-ring 6B in the radial direction and the axial direction with respect to the O-ring mounting part 2t is formed on the inner peripheral surface of the side part 4c on the tip side of the concave-convex fitting part 4e. ing.

In a state where 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 and compressed between the O-ring attachment portion 2t and the O-ring pressing portion 4f. Thereby, leakage of the airflow, the liquid flow, and the gas-liquid mixed flow from the gap between the O-ring attachment portion 2t and the O-ring pressing portion 4f is prevented.
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 opened to the outside is formed between the partition plate 7 and the plate-like portion 4b. .

  The dispersion plate 8 is configured such that a fixing protrusion 8a that fits into 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 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 bonded and fixed to the dispersion plate fixing portion 4d.

In such an assembled state, the surface 8b in the positive Z-axis direction of the dispersion plate 8 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.
Thereby, the dispersion plate 8 is arrange | positioned in the position facing the below-mentioned negative pressure area | region formed in the vicinity of the injection port 7c.
Further, a gas-liquid mixed flow, which will be described later, ejected from the ejection 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 passes through the plate-like portion. 4b is reached.
The dispersion plate 8 has an action of crushing bubbles by an 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. A preferable size of the diameter D will be described later together with an 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. In order to make the bubble diameter distribution bimodal so that the cleaning effect is particularly high, the distance h is more preferably 2.0 mm or more and 3.0 mm or less.

Next, the operation of the shower head 1 will be described.
FIG. 7 is a schematic longitudinal sectional view for explaining the flow of gas and liquid in the mixed bubble generator of the first embodiment of the present invention.

As shown in FIG. 3, in the shower head 1, the pressurized water W ₀ is injected into the water injection conduit 2a, the gas-liquid mixed flow W ₅ to be described later from the outlet nozzle 4a is injected. First, the principle of gas-liquid mixed flow W ₅ is formed 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 turns counterclockwise in the drawing 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 rotate counterclockwise in the drawing along the second flow path 2e.
When the water _{W 0} reaches the inlet opening 5c, which is a part of the water _{W 0} water _{W 1c} it is, flows from the inlet opening 5c inside the outer tubular portion 5a. The water W ₀ that does not flow in from the inflow opening 5c flows into the outer cylinder portion 5a as water W _1b from the inflow opening 5b at the end of the second flow path 2e.
Both the water W _1b and W _1c are flows that branch obliquely in the inner circumferential direction from the water W ₀ swirling around the outer periphery of the outer cylindrical portion 5a, and therefore the inner cylindrical portion 5d and the inner cylindrical portion 5d In the range of the annular gap with the outer cylinder part 5a, each turns counterclockwise as shown in FIG.

As shown in FIG. 7, a cylindrical flow path 5i is formed between the outer cylinder part 5a and the inner cylinder part 5d. A reduced diameter flow path 5j is formed between the taper part 7b and the inner cylinder part 5d. A slit 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 in the injection port 7c on the Z-axis negative direction side with respect to the tip 5p.
A hollow portion 5h extends on the Z axis positive direction side of 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 water W _1b and W _1c flowing in from the inflow openings 5b and 5c move toward the injection port 7c while rotating around the inner cylinder portion 5d in a spiral shape in the same direction 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 rotating flow W ₂ is formed.

In the present embodiment, the water W ₀ flowing into the swivel cylinder 5 faces the second flow path 2 e and flows in from two locations of the inflow openings 5 b and 5 c facing each other with the central axis O interposed therebetween. As shown in FIG. 4, the flow rate of the water W ₀ before flowing into the swivel cylinder 5 increases as it flows from the inlet 2c to the first flow path 2d and the second flow path 2e. This is because, in the present embodiment, the channel cross-sectional area of the second channel 2e is smaller than the channel cross-sectional area of the first channel 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.
Furthermore, the water W ₀ rotates counterclockwise in the figure with respect to the central axis O by flowing through the spiral first flow path 2 d and the second flow path 2 e.
Water _{W 0} is the inflow opening 5b, along the slope of 5c, while maintaining the velocity component in the rotational direction, the water _{W 1b,} as _{W 1c,} flows into the cylindrical channel 5i of the swivel tube 5. The water W _1b and W _1c are further accelerated according to the change in the flow path cross-sectional area due to the inflow openings 5b and 5c.
In this way, the water W _1b and W _1c flow into the cylindrical flow path 5i as a flow having a rotational component in the same direction from two places separated in the circumferential direction, compared with the case where the inflow opening is one place. Te is enhanced rotational speed of the rotating flow W _2.
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 and then merges with the subsequent water W _1b . The preceding water W _1b is decelerated due to the flow path resistance during one round. Therefore, subsequent water W _1b, in order to merge with the water W _1b preceding decelerated, the flow rate is reduced as a whole.
However, when the inflow opening 5c is provided as in the present embodiment, the water W _1b merges with the water W _1c flowing in from the inflow opening 5c in a state where the speed decrease is less than that in the case of one round in the half-turned position. To do. Therefore, the turning cylinder 5 as compared to the case not having the inlet opening 5c, faster rotational flow W ₂ is formed.
Thus, in the present embodiment, the cross-sectional area of the first flow path 2d and the second flow path 2e is reduced toward the inflow opening 5b, and the swivel cylinder 5 has two openings. and it is, but I coupled with a high-speed rotary flow W ₂ is formed.

Cylindrical channel 5i is connected to the inlet portion 2c and airtight, constitute a rotating flow forming passage for forming a rotating flow W ₂ that rotates about axis O direction by the water W ₀ flowing in from the inlet portion 2c Yes.
For example, the rotational speed of the rotating flow W ₂ in the cylindrical channel 5i is more preferably 1000 times / min or more.

In the rotating flow formation path, the water W _1b and the water W _1c rotate at a high speed and mix while colliding with each other. Therefore, in the rotating flow W ₂ formed thereby, clusters of water molecules are subdivided. In rotating flow W _2, by clusters by water molecules is reduced, easily penetrates the inside of the dirt components in the cleaned object. That is, rotational flow W _2, the penetration force of the soil components is improved.
When the cluster of water molecules in the rotating flow W ₂ becomes small, there is an effect that bubbles described later are easily dispersed in the rotating flow W ₂ .

By rotating flow formed passage, fragmentation of clusters generated, an effect of raising the pH of the rotating flow W _2. This is because the reaction between hypochlorite ions (free residual chlorine) contained in tap water and water is promoted by the progress of mixing and stirring so that the water molecule clusters are subdivided. This is probably because the ion concentration increases.
Therefore, rotational flow W ₂ will water free residual chlorine component is reduced to a weak alkaline.

Rotating flow W ₂ while rotating, by advancing a reduced diameter channel 5j in the Z-axis negative direction, the flow velocity is increased. Rotating flow W _2, the flow rate becomes maximum at the slit portion 5q. Rotating flow W ₂ is injected into the circular passage 5r through the slit 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, the negative pressure region extends from the gas outlet 5k toward the center of the surface 8b of the dispersion plate 8.
For this reason, 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 larger than the filter diameter of the dustproof filter 9. Therefore, the air G is sucked without the suction port 3h being blocked by 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 passes through the through hole 3f and is jetted from the emission port 3g into the hollow portion 5h. 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.
Air 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, with subdivision of the water molecule cluster is further promoted, to be ejected from the gas outlet port 5k G is taken inside. Therefore, rotational flow W ₂ are mixed vapor and liquid stream W ₃ becomes having a central axis O around the rotational component, it is injected toward the Z-axis negative direction from the injection port 7c.

Bubble diameter of the bubbles contained in the mixed vapor and liquid stream W ₃ being the inner diameter d1 of the through hole 3f, the magnitude of the negative pressure in the vicinity of the gas outlet 5k, defined by. As the flow rate of the water W ₀ increases, the negative pressure increases as the flow rate increases. However, according to the present inventors' diligent study based on experiments, when the magnitude of the negative pressure is increased to some extent, the size of the generated bubble diameter is almost determined by the size of the inner diameter d1. As described above, the smaller the inner diameter d1, the smaller the generated bubble diameter. Further, according to the study of the present inventor, the number of bubbles increases as the flow rate of the water W ₀ increases in the flow velocity region in which the size of the generated bubble is substantially determined by the size of the inner diameter d1.

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.
If bubbles bubble diameter contained in the gas-liquid mixed flow W ₃ is small, the gas-liquid mixed flow W _4, then includes air bubbles 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 turns from the outer peripheral portion of the dispersion plate 8 into the outlet cap 4 and enters each outlet nozzle 4 a in the plate-like portion 4 b. 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 radially outward along the dispersion plate 8, the gas-liquid mixed flow W ₅ emitted from each outlet nozzle 4 a is emitted radially around the central axis O. Is 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 ° to 90 °.
For example, in the shower head 1 of the present embodiment, when the inner diameter of the injection port 7c is 4.4 mm and the distance h between the decorative plate 11 and the surface 8b is 2.5 mm, the spread angle of the gas-liquid mixed flow W ₄ is In order to set this range, the diameter D of the dispersion plate 8 may be 30 mm or more and 32 mm or less.

Since the flow path from the outer edge of the dispersion plate 8 to the outlet nozzle 4a has a larger cross-sectional area than the flow path between the first plate surface 7d and the dispersion plate 8, there is less interaction between bubbles. Become. For this reason, the gas-liquid mixed flow W ₅ does not vary too greatly from the bubble size distribution of the gas-liquid mixture flow W _4.

Next, a description will be given of bubble size distribution of the gas-liquid mixed flow W _5.
FIG. 8 is a schematic graph showing an example of the bubble diameter distribution of the gas-liquid mixed flow generated by the mixed 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 Is done.
Foam size distribution of the gas-liquid mixed flow W _5, as schematically shown in FIG. 8, with a bimodal.
First bubble group B _m includes a first dominant peak number of bubbles is N _m in bubble diameter m _p. 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.
Second bubble group B _t has a second prominent peak number of bubbles is N _t in bubble size t _p. 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, 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 It is more preferable.

Bubbles in the liquid are formed to have a constant bubble diameter by the balance between the pressure of the gas forming the bubbles and 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 acoustic vibration energy due to vibration at the natural frequency.
As the bubble diameter of the bubble decreases, the natural frequency of the bubble increases, but the vibration tends to attenuate due to the effect of the viscosity of the liquid. For this reason, bubbles with a small bubble diameter have less flexibility (softness) to contract and expand, float in the liquid with a stable bubble diameter, penetrate into the gaps between dirt components, Or adsorb. Even if such bubbles are adsorbed to the dirt component, the sound vibration energy is hardly given to the dirt component.
For example, in the case of a gas-liquid mixed flow of water and air, the bubble diameter of the fine bubbles in which such properties are particularly remarkable is 5 μm or more and 50 μm or less. In the present specification, such fine bubbles are referred to as “micro bubbles”.
When the gas-liquid mixed flow is jetted onto the object to be cleaned, the microbubbles easily penetrate into the dirt component. First bubble group B _m contained in the gas-liquid mixed flow W ₅ of the shower head 1 includes a large amount of microbubbles.

On the other hand, when the bubble diameter is increased, the influence of the viscosity of the liquid is relatively reduced. Therefore, the flexibility is increased, so that the sound vibration energy is increased and the bubble diameter is easily changed. For this reason, the bubble vibrates violently at the natural frequency. When such bubbles are destroyed in an impact, the bubbles are repelled and a shock wave is generated.
Such bubble properties are suppressed whether the bubble diameter is too large or too small. For this reason, the sound wave vibration energy of the bubbles is lowered even if the bubble diameter is too large or too small.
For example, in the case of a gas-liquid mixed flow of water and air, the bubble diameter of the bubbles where the acoustic vibration energy is particularly high is 0.18 mm or more and 0.68 mm or less. In the present specification, such bubbles are referred to as “techno bubbles”.
Since technobubbles in liquids are not easily affected by the viscosity of water, they have a high activity of floating and expanding while vibrating. Furthermore, technobubbles may burst in the liquid or at the liquid surface.
Such a techno bubble is likely to cause adsorption to the dirt component and peeling of the dirt component when the gas-liquid mixed flow is jetted onto the object to be cleaned. Furthermore, since the techno bubble bursts and generates a shock wave, when it bursts in a state where it adheres to the dirt component, it acts to crush or decompose the dirt component. Even if the techno bubble bursts at a position away from the dirt component, the shock wave propagates in the liquid and hits the dirt component, so that the shock is transmitted to the dirt component.
The second bubble group B _t included in the gas-liquid mixed flow W ₅ of the shower head 1 contains a lot of techno bubbles.

According to the studies of the present inventors, in the shower head 1, the first bubble group B _m are mainly in injection port 7c, considered a rotating flow W ₂ and the air G to be generated when the commingled. That is, the gas-liquid mixed flow W ₃ being considered most bubbles composed of the first bubble groups B _m. For this reason, it is particularly preferable that the inner diameter d1 of the through hole 3f be an inner diameter capable of forming microbubbles.
As described above, in order to stably form microbubbles, it is necessary to reduce the opening area of the inner diameter d1.
For this reason, it is important to ensure 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 through a route other than the through hole 3f. In the present embodiment, assembly is performed such 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 between the main body 2 and the swivel cylinder 5, an O-ring. By providing 6A, invasion of the air G is prevented.
For this reason, the hollow portion 5h constitutes a gas introduction chamber that hermetically connects the suction port 3h and the gas outlet 5k. Since the hollow part 5h has a channel cross-sectional area larger than the through hole 3f, for example, even if the splash of the water W ₀ enters from the gas outlet 5k, the flow of the air G does not stagnate.

  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 rubber packing 11 is sandwiched between the revolving cylinder 5 and the partition plate 7 to prevent the air G from entering.

According to the study by the present inventor, in the shower head 1, the second bubble group B _t flows vigorously when the gas-liquid mixed flow W ₃ ejected from the ejection port 7 c collides with the dispersion plate 8. It is considered that some of the fine bubbles are generated when they start to coalesce.
Therefore, the gas-liquid mixed flow W _4, included bubbles relatively large diameter as a second bubble group B _t is. Furthermore, in the process in which the pressure of the gas-liquid mixed flow W ₄ is gradually released in the flow path between the partition plate 7 and the outlet cap 4, the bubble diameter of the combined bubbles grows, and further the combination and splitting are repeated. By doing so, the bubble diameter of the bubbles is considered to be bipolar.
In the outlet nozzle 4a, since the bubbles too large are crushed, mixed vapor and liquid stream W ₅ ejected from the outlet nozzle 4a is considered to indicate a bimodal as shown in Figure 8.
According to the studies of the present inventors, in order to increase the content of techno bubble in the second bubble group B _t is the distance 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 set h appropriately. In the case of the shower head 1 of the present embodiment, the technobubble content is particularly good by setting the distance h to 2.0 mm or more and 3.0 mm or less.

As described above, the gas-liquid mixed flow W ₅ is injected from the shower head 1, a first bubble group B _m rich microbubbles, a second bubble group B _t including many techno bubble, but Have been mixed. For this reason, the shower head 1 is a mixed bubble generator in which micro bubbles and techno bubbles are mixed. Bubbles contained in the mixed vapor and liquid stream W ₅ is more preferably made of microbubbles and Techno 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 for explaining the action of cleaning water containing microbubbles. FIG. 10 is a schematic diagram for explaining the action of the gas-liquid mixed flow in the mixed 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.
Gas-liquid mixed flow W _m is comprised first bubble b _m belonging to the first bubble groups B _m tap water L is mixed number. Examples of the dirt 51 include solid components such as food waste and liquid components such as oil.
Even if the gas-liquid mixed flow W _m hits the dirt 51, the first bubbles b _m do not burst easily and penetrate into the gaps of the dirt 51 or adsorb to the surface of the dirt 51 like fine particles. To do. The reason why the first bubbles b _m adhere to the dirt 51 is that the surface of the first bubbles b _m is negatively charged during the formation of bubbles.
Therefore, dirt 51 is in a state where the first bubble b _m is filled in the surface and gaps. Since the substance of the first bubble b _m is air, a large number of gaps are generated 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 bubbles b _m are stable, the dirt 51 itself is not immediately crushed or removed. 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. For this reason, even if the dirt 51 is cleaned, it takes time to completely remove it. Furthermore, if the dirt 51 is dirt that makes it difficult for the first bubbles b _m to permeate, 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 cleaning object 50 and the dirt 51 are the same as in the cleaning example in FIG.
The gas-liquid mixed flow W ₅ is mixed with a large number of the first bubbles b _m belonging to the first bubble group B _m and the second bubbles b _t belonging to the second bubble group B _t in the water W ₀ . Composed.
The first bubbles b _m have the same action as in the comparative example described above.
On the other hand, since the second bubble b _t has a large bubble diameter, it is difficult to penetrate into the dirt 51 like the first bubble b _m . However, since the surface of the second bubble b _t is also negatively charged in the formation process of the bubble, it is likely to be adsorbed on the surface of the dirt 51 (surface adsorbing action) like the first bubble b _m .
For example, as shown on the left side of FIG. 10, when the second bubble b _t comes into contact with the dirt 51, a part of the surface of the dirt 51 may be peeled off as a peeling piece 52 by the surface adsorption action. .
The second bubbles b _t adsorbed on the surface of the dirt 51 vibrate vigorously at the natural frequency in response to the pressure change from the water W ₀ that is jetted one after another. Thereby, since the sound wave vibration energy propagates to the surface of the dirt 51 and the surface of the dirt 51 becomes weak, 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 through the water W ₀ accumulated in the cleaning target object 50 and acts on the dirt 51 as well.
Thus, the second bubble b _t has a dynamic cleaning action different from that of the first bubble b _m due to its physical characteristics.

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, when the second bubble b _t adheres to the vicinity of the dirt 51 that is weakened by the penetration of the first bubble b _m (see the left portion of the dirt 51 in FIG. 10), the second bubble b _The cleaning effect by vibration and shock wave due to _t is remarkably enhanced.

Such a cleaning action by the shower head 1 has been verified by various experiments. For example, a test sample that was applied to lard on a seto dish and left in a refrigerator for 10 minutes, a shower head 1 in which a gas-liquid mixed flow W ₅ is jetted, a water shower in which only tap water is jetted, The cleaning performance was compared. However, none of the water contains detergent.
In any of the washings, the conditions of a water amount 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 cleaning with the shower head 1, about 95% of lard was removed after 37 seconds. On the other hand, in washing with a water shower, only about 20% of lard was removed after 37 seconds.
Therefore, the gas-liquid mixed flow W _5, can be verified to have a high cleaning capability even for grease with high viscosity, 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 from only the suction port 3h. Therefore, the first bubble group B _m containing microbubbles can be formed stably. At that time, since the inner diameter d1 of the suction port 3h is fixed, it is possible to form bubbles more easily than when performing valve control or the like.
Further, opposite to the injection port 7c, by placing the dispersion plate 8 in place, the gas-liquid mixed flow W ₅ of the second bubble group B _t containing techno bubbles can be incorporated stably.

Furthermore, the shower head 1 can also subdivide the water molecule cluster in the gas-liquid mixed flow W ₅ by forming the rotary flow W ₂ by the rotary flow forming path, and also has a high cleaning efficiency. ₅ can be formed.
Since the free residual chlorine in the water in the rotating flow W ₂ is reduced by the rotating action by the rotating flow forming path, and the rotating flow W ₂ becomes weakly alkaline, it can be suitably used for human skin.

[Second Embodiment]
The mixed bubble generator of the 2nd Embodiment of this invention is demonstrated.
FIG. 11 is a schematic longitudinal sectional view showing an example of the mixed bubble generator according to the second embodiment of the present invention. 12 is a view as seen from B in FIG.

The shower faucet 21 (mixed bubble generator) of the present embodiment shown in FIG. 11 is connected to an appropriate pressurized liquid supply source such as a water pipe, for example, so that the microbubbles similar to those of the first embodiment are used. And a gas-liquid mixed stream containing technobubbles. 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 regarding 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 cylindrical outer shape extending along the central axis C (first axis). The shower faucet 21 is attached to the faucet 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 faucet 20 with respect to an appropriate faucet faucet 20. The faucet faucet 20 supplies water W ₀ similar to that in the first embodiment.
The shower faucet 21 injects a gas-liquid mixed flow in a direction along the central axis C. For this reason, in the first embodiment, air G is introduced along the rotation center axis of the rotating flow, whereas in the present embodiment, 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 attachment portion 23, a swivel cylinder 24, a main body portion 25, a partition plate 26, an opening plug 3, and a water spray plate 28 (second nozzle portion). Prepare.
Below, when demonstrating each structural member of the shower faucet 21, unless otherwise indicated, it demonstrates based on arrangement | positioning in the assembly state shown in FIG.
Furthermore, in the description of the positional relationship between the constituent members, an XYZ orthogonal coordinate system shown in FIG. 11 may be referred to. In the XYZ orthogonal coordinate system, the Z-axis is an axis extending upward from below in the drawing along the central axis C at the outlet of the faucet 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 that is orthogonal to the Z-axis and the Y-axis and extends from the front of the paper toward the back of the paper. The positive direction in each axis is the extending direction of each axis as described above. The negative direction in each axis is the direction opposite to the positive direction.

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

The inner cylinder member 22B is formed in a cylindrical shape through which the faucet faucet 20 can be inserted. On the outer peripheral surface of the inner cylinder member 22B, a male screw 22e that is screwed with the inner peripheral surface of the outer cylinder member 22A is formed.
On the inner periphery of the distal end portion of the inner cylinder member 22B, a groove portion is formed that is engaged with the convex portion 20a of the faucet faucet 20 and the Z-axis negative direction.

On the inner peripheral surface of the outer cylindrical member 22A, a female screw 22d is formed for screwing the male screw of the inner cylindrical member 22B. The screw diameter of the female screw 22d coincides with the screw diameter of a faucet faucet (hereinafter referred to as a threaded faucet faucet) of a type in which a female screw is cut on the outer peripheral portion. For this reason, by removing the inner cylinder member 22B from the faucet fixture 22, the outer cylinder member 22A can be directly screwed into the threaded faucet faucet.
A flange portion 22b connected to a faucet mounting portion 23, which will be described later, protrudes radially outward at an end portion on the Z-axis positive direction side of the outer cylindrical member 22A. At the end of the outer cylinder member 22A on the negative side in the Z-axis direction, a bottom surface portion 22c through which a through hole 22a (liquid inlet) is passed is formed at the center.
The through hole 22 a allows the water W ₀ supplied from the faucet faucet 20 to flow into the shower faucet 21. The inner diameter d10 of the through hole 22a is smaller than the pipe inner diameter of the faucet faucet 20.

The rubber packing 27 is formed in an annular shape that comes into contact with the tip end portion of the faucet faucet 20 and the end portion on the Z-axis negative direction side of the inner cylinder member 22B screwed into the outer cylinder member 22A. 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 of the faucet faucet 20, and is equal to or larger than the inner diameter of the through hole 22a.
The rubber packing 27 is a seal member that hermetically and liquid-tightly seals the faucet faucet 20 and the shower faucet 21.

The faucet mounting portion 23 is a cylindrical member that accommodates the outer cylindrical member 22A inside.
A fixing groove 23a for fixing the flange portion 22b of the outer cylinder member 22A is formed at an end portion of the faucet attachment portion 23 on the positive side in the Z-axis direction. The fixing groove 23a and the flange portion 22b of the outer cylinder member 22A are fixed in an airtight and liquid-tight manner. The fixing method of faucet attachment part 23 and outer cylinder member 22A is not specifically limited. For example, the faucet attachment 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, a step-like locking portion 23 b for positioning the main body portion 25, which will be described later, and a step shape for locking the O-ring 29 in a pressed state are provided on the inner peripheral portion on the Z-axis negative direction side. The locking portion 23c is formed.
The O-ring 29 is a seal member for connecting the faucet mounting portion 23 and a main body portion 25 described later in an airtight and liquid tight manner.

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.
Stator blades 24c is by the water _{W 0} flowing through the through hole 22a, a member that forms a rotating flow _{W 11} that rotates about axis C direction. The stationary blade 24c is arranged such that a plurality of plate-like blade portions are inclined in a fixed direction with respect to a plane perpendicular to the central axis C. The shape of each vane 24c from the water W ₀ flowing along the central axis C, for example, if forming the rotating flow W ₁₁ of rotating in a predetermined direction when viewed in the Z-axis negative direction is not particularly limited. The shape of each stationary blade 24c may be a flat surface or a curved surface.
In the following, as an example, the stator blade 24c will be described in examples in the case of forming the rotating flow W ₁₁ rotating in the clockwise when viewed in the Z-axis negative direction.
Rotating flow W ₁₁ is the inside of the inner circumferential surface 24b, while rotating clockwise as viewed in the Z-axis negative direction, flows in the Z-axis negative direction. Rotating flow W ₁₁ is the inside of the inner circumferential surface 24b, the process proceeds helically in the Z-axis negative direction.

The main body portion 25 is a substantially cylindrical member that forms an outer shape on the Z-axis negative direction side of the faucet attachment 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 toward the Z-axis negative direction side.
The first tubular portion 25e is fitted into the faucet mounting portion 23 from the Z-axis negative direction side. A swivel cylinder 24 inserted from the Z-axis positive direction side is fixed to the inner peripheral part of the first cylindrical part 25e.

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

  The third cylindrical portion 25g is a cylindrical member having a larger diameter than the second cylindrical portion 25f. A water spray plate 28 (to be described later) is inserted into and fixed to the Z-axis negative direction side opening of the third cylindrical portion 25g.

Inside the main body 25, a reduced diameter portion 25i and a tubular portion 25j are provided.
The reduced diameter portion 25i is formed in a cone shape having a tapered surface 25a gradually decreasing in diameter from the end on the Z axis positive direction side of the second cylindrical portion 25f toward the Z axis negative direction. ing.
The tubular portion 25j protrudes radially outward from the surface of the reduced diameter portion 25i on the Z axis negative direction side. The outer peripheral surface of the tubular portion 25j is configured by 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 cylindrical portion 25f.
The end surface of the tubular portion 25j in the negative Z-axis direction is a flat portion 25d that 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. On the inner peripheral side of the end portion of the tubular portion 25j on the Z-axis negative direction side, a liquid ejection port 25b made of a cylindrical surface smoothly connected to the tapered surface 25a is formed.
The inner diameter d11 of the liquid injection port 25b, the flow rate of rotational flow _{W 11} is determined depending on the inner diameter d10 of the through hole 22a so as to properly pass through the liquid injection port 25b.

The partition plate 26 is a substantially disk-shaped member disposed along a plane orthogonal to the central axis C on the inner side of the end portion on the Z-axis negative direction side of the second cylindrical portion 25f. The partition plate 26 has a first plate surface 26a and a second plate surface 26b. The first plate surface 26a is a plane that is orthogonal to the central axis C and that faces in the negative Z-axis direction. The second plate surface 26b is a plane that is orthogonal to the central axis C and faces in the positive direction of the Z axis.
The outer peripheral part of the partition plate 26 is fixed to the inner peripheral surface of the second cylindrical part 25f in an airtight and liquid-tight manner. Examples of a method for fixing the partition plate 26 and the second cylindrical portion 25f include press-fitting, adhesion, and fusion.
At the center portion of the second plate surface 26b, a tubular protrusion 26c protrudes at a position facing the tubular portion 25j of the second tubular portion 25f. An end face 26e in the positive Z-axis direction of 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 that increases in diameter in the negative Z-axis direction 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 26d of the enlarged inner peripheral surface 26d of the end surface 26e of the tubular protrusion 26c is larger than the inner diameter d11 of the liquid ejection port 25b. For this reason, when viewed in the positive direction of the Z-axis, an annular stepped portion 25k is formed on the inner side of the enlarged inner peripheral surface 26d so that the flat portion 25d on the outer periphery of the liquid ejection port 25b is exposed.
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 face 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 airtight and liquid-tightly fixed to the fixing hole 25c in a state where the shaft portion 3b is inserted from the outside into the fixing hole 25c of the second cylindrical portion 25f. The method for fixing the shaft portion 3b and the fixing hole 25c is not particularly limited as long as the shaft portion 3b and the fixing hole 25c 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, bonding, or the like. For example, the shaft portion 3b and the fixing hole 25c may be fixed in an airtight and liquid-tight manner by using a concave-convex fitting such as screwing together with a seal member (not shown).
In a state where the opening plug 3 is fixed to the second cylindrical portion 25f, at least the dustproof filter 9 is exposed to the outside of the disc portion 3a.

The water spray plate 28 includes a plate-like portion 28b, a side surface portion 28e, and a dispersion member 28c.
The plate-like portion 28b (second nozzle portion) is a disc member that can cover the opening on the Z-axis negative direction side of the third tubular portion 25g. The plate-like portion 28b is arranged to face the partition plate 26 with a gap in the Z-axis direction.
As shown in FIG. 12, in the plate-like portion 28b, a plurality of outlet nozzles 28a for injecting a gas-liquid mixed flow formed inside the shower faucet 21 to the outer peripheral side of the dispersion member 28c described later. (Second injection port) is penetrated.
The configuration of the outlet nozzle 28a is the same as that of the outlet nozzle 4a in the first embodiment.

  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-like portion 28b. The side surface portion 28e is fixed in an airtight and liquid-tight manner to the inner peripheral surface of the third cylindrical portion 25g. The fixing method of the side part 28e and the inner peripheral surface of the third cylindrical part 25g is not particularly limited as long as it can be fixed in an airtight and liquid-tight manner. For example, the side surface portion 28e and the inner peripheral surface of the third cylindrical portion 25g may be fixed by press-fitting, bonding, or the like. For example, the side surface portion 28e and the inner peripheral surface of the third cylindrical portion 25g are fixed in an airtight and liquid-tight manner by using an uneven fitting such as screwing together with a seal member (not shown). Also good.

The dispersion member 28c is constituted by a truncated cone-shaped protrusion that protrudes in the positive direction of the Z-axis from the center of the plate-like portion 28b. The central axis of the dispersion member 28 c is coaxial with the central axis C.
A flat portion 28d perpendicular 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 portion 28d is larger than the inner diameter d11 of the liquid ejection port 25b and smaller than the inner diameter of the ejection port 26f. For this reason, a substantially cone-shaped flow path is formed between the dispersion member 28 c and the enlarged inner peripheral surface 26 d of the partition plate 26.
Further, a gas-liquid mixed flow, which will be described later, ejected from the ejection port 26f flows along the inclination of the side surface of the dispersion member 28c after colliding with the flat portion 28d.
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 the 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.
Furthermore, the diameter d12 of the flat portion 28d is set so that the gas-liquid mixed flow can be dispersed in a range of radiation angles suitable for the application 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 the bubbles bimodal so that the cleaning effect is particularly high.

In the shower faucet 21 having such a configuration, a rotating flow forming path for forming the rotating flow W ₁₁ is formed inside the inner peripheral surface 24 b of the swivel cylinder 24.
A first nozzle portion is formed by a tapered surface 25a, a liquid ejection port 25b, and an enlarged inner peripheral surface 26d on the Z axis negative direction side of the rotational flow forming path. 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 in the present embodiment, rotating flow W ₁₁ is, by flowing rotated along the tapered surface 25a, passes through the liquid injection port 25b while gradually flow rate is increased. At this time, since the negative pressure is caused by the rotational flow W ₁₁ that passes through the liquid injection port 25b, near the stepped portion 25k is a negative pressure formation region.
On the outer periphery of the first nozzle portion, a substantially cylindrical shape surrounded by a second cylindrical portion 25f, a reduced diameter portion 25i, a tubular portion 25j, a tubular projection 26c, and a second plate surface 26b of the partition plate 26. A gas introduction chamber 25m is formed.
The gas introduction chamber 25m is an air-tight and liquid-tight space except for a through hole 3f (see FIG. 5) that is a gas inlet opening to the outside and a gap S that opens facing the negative pressure forming region. For this reason, the gap S that opens in the vicinity of the stepped portion 25k is a gas outlet from 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 differences from the first embodiment.
As shown in FIG. 11, in the shower faucet 21, when pressurized water W ₀ is injected from the faucet faucet 20 attached via the faucet fixture 22, the outlet nozzle 28 a is as follows. gas-liquid mixture flow W ₁₄ is injected from.
Water W ₀ injected from the faucet faucet 20 enters the center of the swivel cylinder 24 through the through hole 22a. The water W ₀ collides with the stationary blade 24 c and flows along the stationary blade 24 c, thereby changing to a rotating flow W ₁₁ that rotates clockwise as viewed in the negative Z-axis direction. 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 the same manner as in the first embodiment, the water molecules of the cluster in the rotating flow W ₁₁ is subdivided Is done. Thus, in the rotating flow W ₁₁ is, as in the first embodiment, the free residual chlorine is reduced, pH is raised.

Rotating flow W _11, by rotating along the tapered surface 25a in the first nozzle portion, the flow velocity is accelerated. Rotating flow _{W 11} is injected into the interior of the upset inner peripheral surface 26d from the liquid injection port 25b. 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. The decompressed gas introduction chamber 25m is replenished with air G from the through hole 3f of the air supply pipe 3B that opens to the outside.

Therefore, inside the upset inner peripheral surface 26 d, the rotational flow W ₁₁ and the gas-liquid mixed flow W ₁₂ and the air G is mixed is formed. Upon mixing of the air G, it is considered that scattered partially radially outside the rotational flow W _11, a gap S is open over the entire circumference of the stepped portion 25k, the scattered water gap S is not blocked. For this reason, the inflow of the air G does not stagnate.
Gas-liquid mixed flow W ₁₂ thus formed, while rotating the central axis C around flows in the Z-axis negative direction.
In the present embodiment, as the gas inlet of the air G, because it is used in the first embodiment and similar to the through hole 3f is, it bubbles contained in the mixed vapor and liquid stream W _12, 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.
Gas-liquid mixed flow _{W 13} from the outer peripheral portion of the dispersion member 28c, the partition plate 26, a space surrounded by the third cylindrical portion 25 g, and the sprinkler plate 28, through the outlet nozzle 28a of the plate-like portion 28b, the gas-liquid The mixed flow W ₁₄ is injected outside. At this time, similarly to the first embodiment, the radiation angle from the outlet nozzle 28a varies depending on the size of the diameter d12 of the flat portion 28d of the dispersion member 28c.
For example, when the shower faucet 21 is used for dish washing, it is more preferable that the gas-liquid mixed flow is radiated straight. Therefore, the spread angle of the gas-liquid mixed flow W ₁₄ in the cross section including the center axis line C, and more preferably substantially a 0 °.

The flow path from the outer peripheral portion of the dispersion member 28c to the outlet nozzle 28a has a larger cross-sectional area than the flow path between the enlarged inner peripheral surface 26d and the dispersion member 28c. Less. For this reason, the gas-liquid mixed flow W ₁₄ does not vary too greatly from the bubble size distribution of the gas-liquid mixed flow W _13.

As described above, according to the shower faucet 21 of the present embodiment, except that the rotating flow W ₁₁ is the direction in which the direction for introducing air G perpendicular to the central axis C, a in the first embodiment Similarly, a rotational flow forming path, a first nozzle part, a gas introduction chamber, a dispersion member, and a second nozzle part are provided. Therefore, it bubbles size distribution of the mixed vapor and liquid stream W ₁₄ ejected from the shower faucet 21 has a similar bimodal as in the first embodiment.
Furthermore, according to the shower faucet 21, the gas introduction chamber 25m is provided with a gas inlet by the opening plug 3 similar to that of the first embodiment. Therefore, the flat portion 28d of the diameter d12 in the dispersion member 28c, by setting the distance H between the planar portion 28d and the injection port 26f, as appropriate, to the gas-liquid mixed flow _{W 14,} as in the first embodiment Similarly, the first bubble group B _m containing many microbubbles and the second bubble group B _t containing many techno bubbles can be included.

As described above, the gas-liquid mixed flow W ₁₄ ejected from the shower faucet 21 includes a first bubble group B _m rich microbubbles, a second bubble group B _t including many techno bubble, but Have been mixed. For this reason, the shower faucet 21 is a mixed bubble generating device in which micro bubbles and techno bubbles are mixed. Bubbles contained in the mixed vapor and liquid stream W ₁₄ is more preferably formed of microbubbles and Techno bubbles.

  As described above, the shower faucet 21 of the present embodiment is a mixed bubble generator similar to that of the first embodiment, so that a gas-liquid mixed flow containing bubbles having a high cleaning effect can be stably generated. It can be formed easily.

In the description of each of the above embodiments, an example in which the gas inlet in the gas introduction chamber is formed by the supply pipe 3 </ b> B provided in the opening plug 3 has been described. According to such a configuration, it becomes easy to form a small diameter gas inlet for forming a necessary bubble diameter. Furthermore, when manufacturing various mixed bubble generators having different bubble diameter distributions, parts other than the air supply pipe 3B of the opening plug 3 can be shared.
However, when a gas inlet having a required inner diameter can be easily formed, the gas inlet may be formed by processing through holes in the main body portions 2 and 25 in the above embodiments. Specifically, for example, the gas inflow port may be formed by milling the main body portions 2 and 25. In this case, since the number of parts can be reduced, the cost of the mixed bubble generator can be reduced.

  In the description of each of the above embodiments, an example in which 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. Also good.

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

  In the description of each of the above embodiments, the example in which the inner diameter of the gas inlet is constant has been described. However, 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 rotational flow forming path, the inflow openings 5b and 5c including through-holes penetrating at positions that are 180 ° rotationally symmetric with respect to the central axis of the outer cylinder portion 5a. An example in the case of having In this case, the inflow openings 5b and 5c are in a positional relationship facing each other with the central axis O therebetween.
However, the plurality of inflow openings provided in the rotational 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, an example in which 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 is preliminarily rotated in the same direction as the rotation direction in the rotational flow forming path by flowing through the spiral flow path. By such preliminary rotation, the liquid flowing into the rotation flow formation path increases the circumferential velocity component with respect to the first axis, so that the flow velocity of the rotation flow can be increased.
However, the preliminary rotation is not necessary if the necessary rotational flow speed can be obtained without performing the preliminary rotation.
For example, in the shower head 1, a flow path through which the water W ₀ flows directly into the inflow openings 5b and 5c from the inflow port portion 2c may be formed. 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 5 b and 5 c, a rotating flow can be formed in the swivel cylinder 5.
Moreover, 2nd Embodiment is an example in case 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 all compared with the flow path cross-sectional area of the opening 2n. As described in the case of a small case.
However, it is only necessary that the flow rate of the water W ₀ is faster than the flow rate of the opening 2n at the portion facing the inflow openings 5b and 5c in the second flow path 2e.
For example, the channel cross-sectional area of the second channel 2e may gradually decrease from the connection with the first channel 2d toward the end of the second channel 2e. In this case, the flow velocity at the portion facing the inflow opening 5b is higher than the flow velocity at 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 channel cross-sectional area may be constant toward the end. In this case, the flow velocity at the portion facing the inflow opening 5c and the flow velocity at the portion facing the inflow opening 5b are equal when the speed reduction due to the channel resistance can be ignored.
Furthermore, the channel cross section of the first channel 2d may also gradually decrease from the opening 2n toward the connection with the second channel 2e.

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

Although the preferred embodiment of the present invention has been described above, the present invention is not limited to this embodiment. Additions, omissions, substitutions, and other modifications can be made without departing from the spirit of the present invention.
Further, the present invention is not limited by the above description, and is limited only by the appended claims.

1 Shower head (mixed bubble generator)
2, 25 Main body part 2a Water injection pipe line 2A Head part 2b Spiral partition wall 2c Inlet part (liquid inlet)
2d 1st flow path 2e 2nd flow path 3 Opening plug 3B Air supply pipe 3f Through-hole (gas inflow port)
3g Outlet 3h Inlet 4 Outlet cap 4a, 28a Outlet nozzle (second injection port)
4b, 28b Plate-like part (second nozzle part)
5, 24 Revolving cylinder 5a Outer cylinder part 5b, 5c Inflow opening 5d Inner cylinder part (first nozzle part)
5h Hollow part (gas introduction chamber)
5i Cylindrical channel (rotating flow forming path)
5j Reduced diameter flow path 5k Gas outlet 5q Narrow slit part 5r Circular flow paths 6A, 6B, 29 O-rings 7, 26 Partition plate 7b Tapered part (first nozzle part)
7c injection port (1st injection port, 1st nozzle part)
8 Dispersion plate (dispersion member)
9 Dust-proof filter 11, 27 Rubber packing 20 Faucet faucet 21 Shower faucet (mixed bubble generator)
22 Faucet fixture 22a Through hole (liquid inlet)
23 Faucet mounting portion 24c Stator blade 25a Tapered surface (first nozzle portion)
25b Liquid injection port (first nozzle part)
25d Plane portion 25f Second cylindrical portion 25g Third cylindrical portion 25i Reduced diameter portion 25j Tubular portion 25k Stepped portion 25m Gas introduction chamber 26c Tubular projection 26d Expanded inner peripheral surface (first nozzle portion)
26e End face 26f Injection port (first injection port)
28 Sprinkling plate 28c Dispersing member 28d Flat part 50 Object 51 to be cleaned 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 Clearance (gas outlet)
_{W 0,} W 1b, W _1c water (liquid)
W ₂ , W ₁₁ rotating flow W ₃ , W ₄ , W ₅ , W ₁₂ , W ₁₃ , W ₁₄ gas-liquid mixed flow

Claims (6)

A liquid inlet for injecting pressurized liquid;
A rotating flow forming path that is airtightly connected to the liquid inlet and forms a rotating flow that rotates around the first axis by the liquid flowing in from the liquid inlet;
A first nozzle portion that is airtightly connected to the rotational flow forming path, accelerates the rotational flow, and injects the rotational flow from a first injection port provided coaxially with the first axis;
A gas inlet chamber that hermetically connects a gas inlet into which gas flows and a gas outlet disposed facing a negative pressure formation region by the rotating flow accelerated by the first nozzle portion;
The gas-liquid mixed flow is disposed 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 with the rotating flow collides with the rotary flow. A dispersion member that disperses in the radial direction with respect to the first axis;
A second nozzle part having a second injection port for injecting the gas-liquid mixed flow dispersed by the dispersion member to the outside;
With
The bubble diameter distribution of the gas-liquid mixed flow injected from the second nozzle part has bimodality,
Mixed bubble generator. The bubble size distribution is:
A first dominant peak at a first bubble diameter that maintains a stable bubble diameter when confined in the liquid;
A second dominant peak at a second bubble diameter that is larger than the first bubble diameter and has greater sonic vibration energy;
Having
The mixed bubble generator according to claim 1. 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,
The mixed bubble generator according to claim 2. The bubble size 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 of any one of Claims 1-3. The flow path cross-sectional area of the liquid flow path from the liquid inlet to the rotational flow forming path is smaller than the flow path cross-sectional area at the end near the liquid inlet. The channel cross-sectional area at the part facing the inlet is smaller,
The mixed bubble generator of any one of Claims 1-4. The rotational flow forming path is
A plurality of inflow openings through which the liquid that has flowed in from the liquid inflow port is introduced at different positions in the circumferential direction with respect to the first axis;
The mixed bubble generator of any one of Claims 1-5.

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