JP2021041361A - Main body of fine bubble-generating nozzle - Google Patents

Main body of fine bubble-generating nozzle Download PDF

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JP2021041361A
JP2021041361A JP2019166602A JP2019166602A JP2021041361A JP 2021041361 A JP2021041361 A JP 2021041361A JP 2019166602 A JP2019166602 A JP 2019166602A JP 2019166602 A JP2019166602 A JP 2019166602A JP 2021041361 A JP2021041361 A JP 2021041361A
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pressure reducing
side opening
reducing pipe
pressurized water
opening
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JP7329397B2 (en
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拓也 岩▲崎▼
Takuya Iwasaki
拓也 岩▲崎▼
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Rinnai Corp
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Rinnai Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

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Abstract

To provide a technique capable of causing a gas-dissolved pressurized water flowing out to an outflow place to contain the large amount of fine bubbles.SOLUTION: A main body of a fine bubble-generating nozzle comprises: a pressure reducing pipe causing a gas-dissolved pressurized water to pass through from an upstream side end part toward a downstream side end part; an introduction port open on the upstream side end part of the pressure reducing pipe; an inlet side opening provided at the downstream side of the introduction port; and an outlet side opening opened on the downstream side of the pressure reducing pipe. An opening area of the inlet side opening is smaller than that of the introduction port, and that area of the outlet side opening is larger than that of the inlet side opening. In the pressure reducing pipe, at least one communication hole communicating an outer peripheral wall of the pressure reducing pipe with an inner peripheral wall thereof is open on a particular part near the inlet side opening at the downstream side of that opening.SELECTED DRAWING: Figure 2

Description

本明細書で開示する技術は、微細気泡発生ノズル本体に関する。 The technique disclosed herein relates to a fine bubble generating nozzle body.

特許文献１には、微細気泡発生ノズルが開示されている。この微細気泡発生ノズルは、微細な噴出孔を有する筒状部材であるノズル本体と、ノズル本体の先端に取り付けられるノズルカバーとを備える。ノズルカバーは、噴出孔に対向する壁と、噴出孔よりも微細な流出孔とを有する。 Patent Document 1 discloses a nozzle for generating fine bubbles. The fine bubble generating nozzle includes a nozzle body which is a tubular member having fine ejection holes, and a nozzle cover attached to the tip of the nozzle body. The nozzle cover has a wall facing the ejection hole and an outflow hole finer than the ejection hole.

特許文献１の微細気泡発生ノズルでは、気体（例えば空気、炭酸ガス、水素等）が水に溶解している気体溶解加圧水がノズル本体に供給されると、気体溶解加圧水は、ノズル本体を通って噴出孔から壁に向けて噴出される。噴出孔から噴出された気体溶解加圧水は、壁に衝突してノズルカバー内で迂回した後、流出孔から流出箇所（具体的には浴槽）に流出される。気体溶解加圧水は、微細な噴出孔、及び、さらに微細な流出孔を通過することにより、大気圧まで徐々に減圧される。気体溶解加圧水が減圧される過程において、気体溶解加圧水に溶解されていた気体が析出し、微細気泡が発生する。即ち、特許文献１の微細気泡発生ノズルでは、気体溶解加圧水の流通過程で気体溶解加圧水を減圧することにより、流出箇所（具体的には浴槽）に流出される気体溶解加圧水に微細気泡を含ませることができる。 In the fine bubble generating nozzle of Patent Document 1, when gas-dissolved pressurized water in which a gas (for example, air, carbon dioxide, hydrogen, etc.) is dissolved in water is supplied to the nozzle body, the gas-dissolved pressurized water passes through the nozzle body. It is ejected from the ejection hole toward the wall. The gas-dissolved pressurized water ejected from the ejection hole collides with the wall and detours in the nozzle cover, and then flows out from the outflow hole to the outflow point (specifically, the bathtub). The gas-dissolved pressurized water is gradually depressurized to atmospheric pressure by passing through a fine ejection hole and a finer outflow hole. In the process of depressurizing the gas-dissolved pressurized water, the gas dissolved in the gas-dissolved pressurized water is precipitated and fine bubbles are generated. That is, in the fine bubble generation nozzle of Patent Document 1, the gas dissolution pressurized water is depressurized in the flow process of the gas dissolution pressurized water, so that the gas dissolution pressurized water flowing out to the outflow point (specifically, the bathtub) contains the fine bubbles. be able to.

特開２００７−１６７５５７号公報JP-A-2007-167557

しかしながら、特許文献１の微細気泡発生ノズルでは、流出箇所に流出される気体溶解加圧水に含まれる微細気泡の量が不十分であるという状況が発生する。 However, in the fine bubble generating nozzle of Patent Document 1, a situation occurs in which the amount of fine bubbles contained in the gas-dissolved pressurized water flowing out to the outflow portion is insufficient.

本明細書では、流出箇所に流出される気体溶解加圧水に微細気泡を大量に含ませることができる技術を提供する。 The present specification provides a technique capable of containing a large amount of fine bubbles in the gas-dissolved pressurized water flowing out to the outflow point.

本明細書によって開示される微細気泡発生ノズル本体は、上流側端部から下流側端部に向けて、気体が水に溶解している気体溶解加圧水を通過させる減圧管と、前記上流側端部に開口され、外部から前記減圧管内に前記気体溶解加圧水を導入する導入口と、前記減圧管のうち前記導入口よりも下流側に設けられ、前記減圧管内に導入された前記気体溶解加圧水を通過させる入口側開口部と、前記入口側開口部よりも下流側である前記下流側端部に開口された出口側開口部と、を備えている。前記入口側開口部の開口面積は前記導入口の開口面積よりも小さく、前記出口側開口部の開口面積は前記入口側開口部の開口面積よりも大きく、前記減圧管のうち、前記入口側開口部よりも下流側であって前記入口側開口部近傍の特定部分に、前記減圧管の外周壁と内周壁とを連通する少なくとも１個の連通孔が開口されている。 The fine bubble generating nozzle main body disclosed by the present specification includes a pressure reducing pipe for passing gas-dissolved pressurized water in which a gas is dissolved in water from an upstream end to a downstream end, and the upstream end. And an introduction port for introducing the gas-dissolving pressurized water into the decompression pipe from the outside, and the gas-dissolving pressurized water provided in the decompression pipe on the downstream side of the introduction port and introduced into the decompression pipe. It is provided with an inlet-side opening to be allowed to be formed, and an outlet-side opening opened at the downstream-side end portion on the downstream side of the inlet-side opening. The opening area of the inlet side opening is smaller than the opening area of the introduction port, the opening area of the outlet side opening is larger than the opening area of the inlet side opening, and the inlet side opening of the pressure reducing pipe. At least one communication hole for communicating the outer peripheral wall and the inner peripheral wall of the pressure reducing pipe is opened in a specific portion on the downstream side of the portion and in the vicinity of the inlet side opening.

上記の構成によると、気体溶解加圧水は、外部から減圧管内に導入される際に入口側開口部を通過することによって流速が上昇し、その結果減圧される（ベンチュリー効果）。気体溶解加圧水が減圧されることにより、気体溶解加圧水に溶解していた気体が析出し、微細気泡の元になる気泡（気泡核とも言う）が発生する。その後、減圧管の出口側開口部から排出された気体溶解加圧水は、流出箇所に流出されるまでの間、所定の流通経路を流通されながら増圧される。減圧によって気泡が析出させられた後の気体溶解加圧水が増圧されると、気体溶解加圧水に含まれる気泡が分裂して微細気泡になる。 According to the above configuration, when the gas-dissolved pressurized water is introduced into the pressure reducing pipe from the outside, the flow velocity is increased by passing through the inlet side opening, and as a result, the pressure is reduced (Venturi effect). When the gas-dissolved pressurized water is depressurized, the gas dissolved in the gas-dissolved pressurized water is precipitated, and bubbles (also called bubble nuclei) that are the source of fine bubbles are generated. After that, the gas-dissolved pressurized water discharged from the outlet-side opening of the pressure reducing pipe is increased in pressure while being circulated through a predetermined distribution route until it is discharged to the outflow point. When the pressure of the gas-dissolving pressurized water after the bubbles are precipitated by the reduced pressure is increased, the bubbles contained in the gas-dissolving pressurized water are split into fine bubbles.

そして、上記の構成によると、減圧管の特定部分に少なくとも１個の連通孔が開口されているため、気体溶解加圧水が入口側開口部を通過することに伴うベンチュリー効果によって減圧管内に負圧が生じる場合に、その負圧によって、外部から連通孔を通って気体溶解加圧水が減圧管内に引き込まれる。連通孔から減圧管内に引き込まれた気体溶解加圧水は、減圧管内を入口側開口部から出口側開口部に向けて流れる気体溶解加圧水のうちの減圧管内周壁付近の気体溶解加圧水の流れと衝突する。その結果、内周壁付近の流速が径方向中心付近の流速よりも遅くなる。内周壁付近と中心付近の流速差が大きくなることで、より多くの気泡核が生じる。その結果、上記の微細気泡発生ノズル本体を用いることで、気泡核を元にする微細気泡を大量に発生させることができる。 According to the above configuration, since at least one communication hole is opened in the specific portion of the pressure reducing pipe, a negative pressure is generated in the pressure reducing pipe due to the Venturi effect caused by the gas-dissolved pressurized water passing through the opening on the inlet side. When it occurs, the negative pressure draws the gas-dissolved pressurized water into the pressure reducing pipe from the outside through the communication hole. The gas-dissolving pressurized water drawn into the decompression pipe from the communication hole collides with the flow of the gas-dissolving pressurized water near the inner peripheral wall of the decompression pipe among the gas-dissolving pressurized water flowing in the decompression pipe from the inlet side opening to the outlet side opening. As a result, the flow velocity near the inner peripheral wall becomes slower than the flow velocity near the radial center. As the difference in flow velocity between the vicinity of the inner peripheral wall and the vicinity of the center increases, more bubble nuclei are generated. As a result, by using the above-mentioned fine bubble generation nozzle main body, a large amount of fine bubbles based on the bubble nuclei can be generated.

ここで言う「気体」は、空気、炭酸ガス、水素等、水に溶解可能な任意の気体を含む。 The term "gas" as used herein includes any gas that is soluble in water, such as air, carbon dioxide, and hydrogen.

前記少なくとも１個の連通孔の合計開口面積は、前記入口側開口部の開口面積よりも小さくてもよい。 The total opening area of the at least one communication hole may be smaller than the opening area of the entrance side opening.

この構成によると、少なくとも１個の連通孔の合計開口面積が、入口側開口部の開口面積以上である構成を採用する場合に比べて、減圧管内で発生する負圧によって外部から連通孔を通って減圧管内に気体溶解加圧水が引き込まれ易くなる。即ち、減圧管内で発生する負圧を有効に働かせることができる。 According to this configuration, as compared with the case where the total opening area of at least one communication hole is equal to or larger than the opening area of the inlet side opening, the communication hole is passed from the outside by the negative pressure generated in the pressure reducing pipe. Therefore, the gas-dissolved pressurized water is easily drawn into the pressure reducing pipe. That is, the negative pressure generated in the pressure reducing tube can be effectively used.

前記特定部分における前記減圧管の開口面積は、前記入口側開口部の開口面積以上であって１１０％以内であってもよい。 The opening area of the pressure reducing pipe in the specific portion may be equal to or larger than the opening area of the inlet side opening and may be 110% or less.

この構成によると、減圧管のうち、少なくとも１個の連通孔が形成されている特定部分における開口面積は、入口側開口部の開口面積の１１０％以内である。即ち、減圧管のうち、入口側開口部から見た開口面積の増分が１０％以内である範囲内に連通孔が形成される。この範囲は、主に入口側開口部の通過直後の範囲であるため、この範囲を通過する気体溶解加圧水には比較的大きい負圧が生じる。そのため、上記の構成によると、連通孔を通って外部から減圧管内に気体溶解加圧水が引き込まれ易くなる。即ち、減圧管内で発生する負圧をより有効に働かせることができる。 According to this configuration, the opening area of the pressure reducing pipe in the specific portion where at least one communication hole is formed is within 110% of the opening area of the inlet side opening. That is, the communication hole is formed in the pressure reducing pipe within a range in which the increment of the opening area as seen from the inlet side opening is within 10%. Since this range is mainly the range immediately after passing through the inlet side opening, a relatively large negative pressure is generated in the gas-dissolved pressurized water passing through this range. Therefore, according to the above configuration, the gas-dissolved pressurized water is easily drawn into the pressure reducing pipe from the outside through the communication hole. That is, the negative pressure generated in the pressure reducing tube can be used more effectively.

微細気泡発生ノズル１０の斜視図。The perspective view of the fine bubble generation nozzle 10. 図１のＩＩ−ＩＩ線に沿った微細気泡発生ノズル１０の断面図。FIG. 2 is a cross-sectional view of the fine bubble generating nozzle 10 along the line II-II of FIG. ノズル本体２０の斜視図。The perspective view of the nozzle body 20. ノズル本体２０の入口側開口部２４近傍の拡大断面図。An enlarged cross-sectional view of the vicinity of the inlet side opening 24 of the nozzle body 20. ホルダ部４０の斜視図。The perspective view of the holder part 40.

（実施例）
（微細気泡発生ノズル１０の構成）
図１〜図５を参照して、第１実施例の微細気泡発生ノズル１０について説明する。微細気泡発生ノズル１０は、浴槽（図示省略）等の流出箇所に微細気泡を含む水を供給するためのノズルである。図１に示すように、微細気泡発生ノズル１０は、ノズル本体２０と、ホルダ部４０と、を備える。図１、図２において、ノズル本体２０は、ホルダ部４０に支持されている。 (Example)
(Structure of Fine Bubble Generation Nozzle 10)
The fine bubble generating nozzle 10 of the first embodiment will be described with reference to FIGS. 1 to 5. The fine bubble generating nozzle 10 is a nozzle for supplying water containing fine bubbles to an outflow point such as a bathtub (not shown). As shown in FIG. 1, the fine bubble generating nozzle 10 includes a nozzle body 20 and a holder portion 40. In FIGS. 1 and 2, the nozzle body 20 is supported by the holder portion 40.

（ノズル本体２０の構成）
図１〜図４を参照して、ノズル本体２０の構成について説明する。なお、以下の説明では、図２中のＸ軸方向を左右方向、Ｙ軸方向を上下方向、Ｚ軸方向を前後方向と呼ぶ場合がある。図３に示すように、ノズル本体２０は、減圧管２２と鍔部２８とを備える。 (Structure of nozzle body 20)
The configuration of the nozzle body 20 will be described with reference to FIGS. 1 to 4. In the following description, the X-axis direction in FIG. 2 may be referred to as a left-right direction, the Y-axis direction may be referred to as a vertical direction, and the Z-axis direction may be referred to as a front-back direction. As shown in FIG. 3, the nozzle body 20 includes a pressure reducing tube 22 and a flange portion 28.

図１〜図４に示すように、減圧管２２は、空気が水に溶解している空気溶解加圧水の圧力を減圧することができる管状部材である。図２に示すように、減圧管２２の内部には、減圧管２２内を２本の管部に区画する区画壁２５が設けられている。減圧管２２の後方側の上流側端部２２ａ（図中Ｚ軸の負方向側の端部）には、２個の導入口２３が開口されている。導入口２３には、空気が水に溶解している空気溶解加圧水を供給するための給水手段（図示しない）から、空気溶解加圧水が供給される。本実施例では、導入口２３及び連通孔３０（後述）を含む減圧管２２の後方側の部分（即ち、鍔部２８より後方側の部分）が、上記給水手段から水が供給される給水空間（図示しない）内に配置される。ここで、空気溶解加圧水は、流出箇所に供給される微細気泡を含む水の原料となる液体である。 As shown in FIGS. 1 to 4, the pressure reducing pipe 22 is a tubular member capable of reducing the pressure of air-dissolved pressurized water in which air is dissolved in water. As shown in FIG. 2, inside the pressure reducing pipe 22, a partition wall 25 for partitioning the inside of the pressure reducing pipe 22 into two pipe portions is provided. Two introduction ports 23 are opened at the upstream end 22a (the end on the negative direction side of the Z axis in the drawing) on the rear side of the pressure reducing pipe 22. Air-dissolved pressurized water is supplied to the introduction port 23 from a water supply means (not shown) for supplying air-dissolved pressurized water in which air is dissolved in water. In this embodiment, the portion on the rear side of the pressure reducing pipe 22 (that is, the portion on the rear side of the flange portion 28) including the introduction port 23 and the communication hole 30 (described later) is a water supply space to which water is supplied from the water supply means. It is placed inside (not shown). Here, the air-dissolved pressurized water is a liquid that is a raw material of water containing fine bubbles supplied to the outflow point.

減圧管２２のうち、上流側端部２２ａの近傍であって、２個の導入口２３よりもやや前方寄り（即ち、下流側寄り。Ｚ軸の正方向寄りとも言う）の位置には、２個の入口側開口部２４が開口されている。入口側開口部２４の開口面積は、導入口２３の開口面積よりも小さい。言い換えると、減圧管２２は、入口側開口部２４において縮径されている。区画壁２５は、減圧管２２の後方側の上流側端部２２ａ（図中Ｚ軸の負方向側の端部）から、減圧管２２の途中までの区間を２本の管部に区画している。そのため、減圧管２２の前方側の下流側端部２２ｂ（図中Ｚ軸の正方向側の端部）は、区画壁２５によって２本の管部に区画されていない。下流側端部２２ｂには、１個の出口側開口部２６のみが開口されている。本実施例では、出口側開口部２６の開口面積（即ちＸＹ平面上の面積）は、２個の入口側開口部２４の開口面積（即ちＸＹ平面上の面積）の合計面積よりも大きい。言い換えると、減圧管２２は、入口側開口部２４から出口側開口部２６に向かって拡径されている。 Of the pressure reducing pipe 22, 2 is located near the upstream end 22a and slightly forward of the two inlets 23 (that is, toward the downstream side, also referred to as the Z-axis in the positive direction). The entrance side openings 24 are opened. The opening area of the entrance side opening 24 is smaller than the opening area of the introduction port 23. In other words, the pressure reducing pipe 22 is reduced in diameter at the inlet side opening 24. The partition wall 25 divides the section from the upstream end 22a on the rear side of the pressure reducing pipe 22 (the end on the negative direction of the Z axis in the drawing) to the middle of the pressure reducing pipe 22 into two pipes. There is. Therefore, the downstream end 22b on the front side of the pressure reducing pipe 22 (the end on the positive direction side of the Z axis in the drawing) is not divided into two pipes by the partition wall 25. Only one outlet side opening 26 is opened in the downstream side end portion 22b. In this embodiment, the opening area of the outlet side opening 26 (that is, the area on the XY plane) is larger than the total area of the opening areas (that is, the area on the XY plane) of the two inlet side openings 24. In other words, the pressure reducing pipe 22 is expanded in diameter from the inlet side opening 24 toward the outlet side opening 26.

とくに図２、図４に示すように、減圧管２２のうち、各入口側開口部２４よりも下流側であって、各入口側開口部２４の通過直後の部分（即ち入口側開口部２４の近傍の部分。以下では「特定部分」と呼ぶ場合がある）に、減圧管２２の外周壁と内周壁とを連通する連通孔３０が１個ずつ開口されている。各連通孔３０の開口面積は、各入口側開口部２４の開口面積よりも小さい。また、本実施例では、連通孔３０が形成されている部分（即ち特定部分）における減圧管２２の開口面積は、入口側開口部２４の開口面積とほぼ等しい。即ち、本実施例では、入口側開口部２４から見た開口面積の増分がほぼない範囲内に連通孔３０が形成される。 In particular, as shown in FIGS. 2 and 4, the portion of the pressure reducing pipe 22 that is downstream of each inlet side opening 24 and immediately after passing through each inlet side opening 24 (that is, the inlet side opening 24). A communication hole 30 for communicating the outer peripheral wall and the inner peripheral wall of the pressure reducing pipe 22 is opened in a nearby portion (hereinafter, may be referred to as a “specific portion”). The opening area of each communication hole 30 is smaller than the opening area of each entrance side opening 24. Further, in this embodiment, the opening area of the pressure reducing pipe 22 in the portion where the communication hole 30 is formed (that is, the specific portion) is substantially equal to the opening area of the inlet side opening 24. That is, in this embodiment, the communication hole 30 is formed within a range in which there is almost no increase in the opening area as seen from the inlet side opening 24.

図２、図３に示すように、鍔部２８は、減圧管２２の前後方向中間部付近の外面に設けられている円板状部材である。図２に示すように、鍔部２８の外径は、減圧管２２の外径よりも大きい。 As shown in FIGS. 2 and 3, the flange portion 28 is a disk-shaped member provided on the outer surface of the pressure reducing pipe 22 near the intermediate portion in the front-rear direction. As shown in FIG. 2, the outer diameter of the flange portion 28 is larger than the outer diameter of the pressure reducing pipe 22.

（ホルダ部４０の構成）
続いて、図１、図２、図５を参照して、ホルダ部４０の構成について説明する。図５に顕著に示されるように、ホルダ部４０は、外側円筒部４２と、内側円筒部４４と、２個の連結部５２と、を備える。外側円筒部４２と２個の連結部５２とは連続して一体に成形されている。内側円筒部４４は、外側円筒部４２の内側に収容されて形成されている。 (Structure of holder portion 40)
Subsequently, the configuration of the holder portion 40 will be described with reference to FIGS. 1, 2, and 5. As is notably shown in FIG. 5, the holder portion 40 includes an outer cylindrical portion 42, an inner cylindrical portion 44, and two connecting portions 52. The outer cylindrical portion 42 and the two connecting portions 52 are continuously and integrally formed. The inner cylindrical portion 44 is formed by being housed inside the outer cylindrical portion 42.

外側円筒部４２は、円筒状の部材である。図２、図５に示すように、後方側の開口部には、上述のノズル本体２０の鍔部２８を収容するための段差４３が形成されている。 The outer cylindrical portion 42 is a cylindrical member. As shown in FIGS. 2 and 5, a step 43 for accommodating the flange portion 28 of the nozzle body 20 described above is formed in the opening on the rear side.

２個の連結部５２は、それぞれ、外側円筒部４２の外周面から外側に突出して形成されている。連結部５２には、ネジ穴Ｂが設けられている。連結部５２のネジ穴Ｂは、ホルダ部４０を浴槽接続具（図示省略）に取付けるためのネジ穴である。なお、浴槽接続具は、微細気泡発生ノズル１０を浴槽に取付けるための機具である。ホルダ部４０内に、ノズル本体２０を挿入した後に、浴槽接続具の取付穴（図示省略）と連結部５２のネジ穴Ｂを位置合わせし、ネジ部材（図示省略）をネジ穴Ｂに螺合させることで、微細気泡発生ノズル１０と浴槽接続具が連結される。 Each of the two connecting portions 52 is formed so as to project outward from the outer peripheral surface of the outer cylindrical portion 42. The connecting portion 52 is provided with a screw hole B. The screw hole B of the connecting portion 52 is a screw hole for attaching the holder portion 40 to the bathtub connector (not shown). The bathtub connector is a device for attaching the fine bubble generating nozzle 10 to the bathtub. After inserting the nozzle body 20 into the holder portion 40, the mounting hole (not shown) of the bathtub connector and the screw hole B of the connecting portion 52 are aligned, and the screw member (not shown) is screwed into the screw hole B. By doing so, the fine bubble generating nozzle 10 and the bathtub connector are connected.

内側円筒部４４は、外側円筒部４２の内側に収容されて形成されている筒状部材である。内側円筒部４４は、４個の接続部４８を介して外側円筒部４２の内面と接続されている。内側円筒部４４と外側円筒部４２との間の隙間により、４個の流出口５０が形成されている。 The inner cylindrical portion 44 is a tubular member formed inside the outer cylindrical portion 42. The inner cylindrical portion 44 is connected to the inner surface of the outer cylindrical portion 42 via four connecting portions 48. Four outlets 50 are formed by the gap between the inner cylindrical portion 44 and the outer cylindrical portion 42.

内側円筒部４４の前方側端部には、円板部４６が形成されている。円板部４６は、内側円筒部４４の前方側端部を閉塞している。円板部４６のＸＹ平面における中心部には、Ｙ軸に沿って突出部４９が形成されている。突出部４９は、円板部４６の後側の面から後方に向けて突出する略壁状の突起部材である。図５に顕著に示されるように、突出部４９によって、円板部４６の後側の面が左右に分断される。図２に示すように、突出部４９の先端付近は、後方から前方に向かう方向（即ち、空気溶解加圧水の流れ方向（図２中矢印参照））に沿って見た場合に、当該方向に対してやや傾斜している。言い換えると、突出部４９の先端付近は、後方に向かって丸く尖るように形成されている。 A disk portion 46 is formed at the front end portion of the inner cylindrical portion 44. The disk portion 46 closes the front end portion of the inner cylindrical portion 44. A protrusion 49 is formed along the Y axis at the center of the disk portion 46 in the XY plane. The protrusion 49 is a substantially wall-shaped protrusion member that protrudes rearward from the rear surface of the disk portion 46. As is notably shown in FIG. 5, the protruding portion 49 divides the rear surface of the disc portion 46 into left and right. As shown in FIG. 2, the vicinity of the tip of the protrusion 49 is relative to the direction when viewed along the direction from the rear to the front (that is, the flow direction of the air-dissolved pressurized water (see the arrow in FIG. 2)). It is slightly inclined. In other words, the vicinity of the tip of the protrusion 49 is formed so as to be rounded and pointed toward the rear.

（ノズル本体２０がホルダ部４０に支持される状態）
続いて、ノズル本体２０がホルダ部４０に支持される状態における各構成要素の位置関係について説明する。図１、図２に示すように、ノズル本体２０がホルダ部４０に支持されることにより、本実施例の微細気泡発生ノズル１０が形成される。この状態では、ノズル本体２０のうち、減圧管２２の下流側端部２２ｂ及び鍔部２８がホルダ部４０内に差し込まれている。具体的には、減圧管２２の下流側端部２２ｂは、ホルダ部４０の内側円筒部４４（後述）内に差し込まれている。また、鍔部２８は、外側円筒部４２の開口部に形成されている段差４３内に収容されている。この際、鍔部２８の前面２８ａは、段差４３と当接する。ノズル本体２０がホルダ部４０に支持されている状態では、減圧管２２の上流側端部２２ａは、ホルダ部４０の後方側に突出している。 (A state in which the nozzle body 20 is supported by the holder portion 40)
Subsequently, the positional relationship of each component in a state where the nozzle body 20 is supported by the holder portion 40 will be described. As shown in FIGS. 1 and 2, the nozzle body 20 is supported by the holder portion 40, so that the fine bubble generating nozzle 10 of this embodiment is formed. In this state, the downstream end portion 22b and the flange portion 28 of the pressure reducing pipe 22 of the nozzle body 20 are inserted into the holder portion 40. Specifically, the downstream end 22b of the pressure reducing pipe 22 is inserted into the inner cylindrical portion 44 (described later) of the holder portion 40. Further, the flange portion 28 is housed in a step 43 formed in the opening of the outer cylindrical portion 42. At this time, the front surface 28a of the flange portion 28 comes into contact with the step 43. In a state where the nozzle body 20 is supported by the holder portion 40, the upstream end portion 22a of the pressure reducing pipe 22 projects to the rear side of the holder portion 40.

図２に示すように、ノズル本体２０がホルダ部４０に支持される状態では、突出部４９の先端部分は、減圧管２２の下流側端部２２ｂに対向して配置される。さらに言うと、突出部４９の先端部分は、区画壁２５の前端部と対向している。そして、この状態では、減圧管２２の下流側端部２２ｂと円板部４６とが対向するように配置される。 As shown in FIG. 2, in a state where the nozzle body 20 is supported by the holder portion 40, the tip portion of the protruding portion 49 is arranged so as to face the downstream end portion 22b of the pressure reducing pipe 22. Furthermore, the tip portion of the protrusion 49 faces the front end portion of the partition wall 25. Then, in this state, the downstream end portion 22b of the pressure reducing pipe 22 and the disk portion 46 are arranged so as to face each other.

ノズル本体２０がホルダ部４０に支持されることにより、ノズル本体２０とホルダ部４０とによって、流路空間６２、通路６４、流路空間６６、及び、通路６８が形成される。流路空間６２、通路６４、流路空間６６、通路６８は、いずれも、空気溶解加圧水をこの順で流通させるための空間及び通路である。 When the nozzle body 20 is supported by the holder portion 40, the nozzle body 20 and the holder portion 40 form a flow path space 62, a passage 64, a flow path space 66, and a passage 68. The flow path space 62, the passage 64, the flow path space 66, and the passage 68 are all spaces and passages for flowing the air-dissolved pressurized water in this order.

流路空間６２は、減圧管２２の下流側端部２２ｂと円板部４６との間に形成される。流路空間６２の流路面積は、どの部分においても、上述の出口側開口部２６の流路面積の合計面積よりも大きい。詳しく言うと、減圧管２２の下流側端部２２ｂの前方における、下流側端部２２ｂの延長線と突出部４９との間の空間のＸＹ平面上の面積、および、下流側端部２２ｂと円板部４６との間の空間の面積（より詳しくは、円板部４６のＸＹ平面上の中心から垂直に伸びる軸線を中心軸とし、かつ、ＸＹ平面上における上記中心軸と下流側端部２２ｂの外側とを結ぶ線を半径とする仮想的な円柱のうち、下流側端部２２ｂと円板部４６との間の範囲の外側面部分の面積）のいずれもが、上述の出口側開口部２６の流路面積の合計面積よりも大きい。 The flow path space 62 is formed between the downstream end portion 22b of the pressure reducing pipe 22 and the disk portion 46. The flow path area of the flow path space 62 is larger than the total area of the flow path areas of the outlet side opening 26 described above in any portion. More specifically, the area on the XY plane of the space between the extension line of the downstream end 22b and the protrusion 49 in front of the downstream end 22b of the pressure reducing pipe 22, and the downstream end 22b and the circle. The area of the space between the plate portion 46 (more specifically, the axis extending vertically from the center of the disk portion 46 on the XY plane is the central axis, and the central axis and the downstream end portion 22b on the XY plane are the central axes. Of the virtual cylinders whose radius is the line connecting the outside of the above, all of the outer surface portions in the range between the downstream end portion 22b and the disk portion 46) are the above-mentioned outlet side openings. It is larger than the total area of the flow path areas of 26.

通路６４は、流路空間６２の下流側に形成される。通路６４は、内側円筒部４４の内面と、内側円筒部４４内に配置された減圧管２２の外面との間に形成される。ここで、通路６４の流路面積（即ちＸＹ平面上の面積）は、上述の流路空間６２のどの部分の流路面積よりも大きい。 The passage 64 is formed on the downstream side of the flow path space 62. The passage 64 is formed between the inner surface of the inner cylindrical portion 44 and the outer surface of the pressure reducing pipe 22 arranged in the inner cylindrical portion 44. Here, the flow path area of the passage 64 (that is, the area on the XY plane) is larger than the flow path area of any part of the above-mentioned flow path space 62.

流路空間６６は、通路６４の下流側に形成される。流路空間６６は、内側円筒部４４の後端と鍔部２８の前面２８ａとの間に形成される。流路空間６６は、内側円筒部４４の後端、外側円筒部４２の内面、減圧管２２の外面、及び、鍔部２８の前面２８ａによって画定される空間である。流路空間６６の流路面積は、どの部分においても、上述の通路６４の流路面積よりも大きい。詳しく言うと、内側円筒部４４の後端と減圧管２２の外面の間の空間のＸＹ平面上の面積、内側円筒部４４の後端と鍔部２８の前面２８ａとの間の空間の面積（より詳しくは、円板部４６のＸＹ平面上の中心から垂直に伸びる軸線を中心軸とし、かつ、ＸＹ平面上における上記中心軸と内側円筒部４４の外側とを結ぶ線を半径とする仮想的な円柱のうち、内側円筒部４４の後端と前面２８ａとの間の範囲の外側面部分の面積）、および、内側円筒部４４の後端と外側円筒部４２の内面との間の空間のＸＹ平面上の面積、のいずれもが、上述の通路６４の流路面積よりも大きい。 The passage space 66 is formed on the downstream side of the passage 64. The flow path space 66 is formed between the rear end of the inner cylindrical portion 44 and the front surface 28a of the flange portion 28. The flow path space 66 is a space defined by the rear end of the inner cylindrical portion 44, the inner surface of the outer cylindrical portion 42, the outer surface of the pressure reducing pipe 22, and the front surface 28a of the flange portion 28. The flow path area of the flow path space 66 is larger than the flow path area of the above-mentioned passage 64 in any portion. More specifically, the area of the space between the rear end of the inner cylindrical portion 44 and the outer surface of the pressure reducing tube 22 on the XY plane, the area of the space between the rear end of the inner cylindrical portion 44 and the front surface 28a of the flange portion 28 ( More specifically, a virtual axis whose central axis is an axis extending vertically from the center of the disk portion 46 on the XY plane and whose radius is a line connecting the central axis on the XY plane and the outside of the inner cylindrical portion 44. Area of the outer surface portion of the range between the rear end of the inner cylindrical portion 44 and the front surface 28a) and the space between the rear end of the inner cylindrical portion 44 and the inner surface of the outer cylindrical portion 42. Both of the areas on the XY plane are larger than the flow path area of the passage 64 described above.

通路６８は、流路空間６６の下流側に形成される。通路６８は、流路空間６６と流出口５０とを接続する通路である。通路６８は、外側円筒部４２の内面と内側円筒部４４の外面との間の隙間によって形成される。ここで、通路６８の流路面積（即ちＸＹ平面上の面積）は、上述の流路空間６６のどの部分の流路面積よりも大きい。 The passage 68 is formed on the downstream side of the flow path space 66. The passage 68 is a passage connecting the flow path space 66 and the outflow port 50. The passage 68 is formed by a gap between the inner surface of the outer cylindrical portion 42 and the outer surface of the inner cylindrical portion 44. Here, the flow path area of the passage 68 (that is, the area on the XY plane) is larger than the flow path area of any part of the above-mentioned flow path space 66.

（空気溶解加圧水の流れ）
図２、図４を参照して、微細気泡発生ノズル１０内における空気溶解加圧水の流れ、及び、それに伴って微細気泡が形成される過程について説明する。図２、図４において、実線矢印が空気溶解加圧水の流路を示している。 (Flow of air-dissolved pressurized water)
With reference to FIGS. 2 and 4, the flow of air-dissolved pressurized water in the fine bubble generating nozzle 10 and the process of forming fine bubbles accordingly will be described. In FIGS. 2 and 4, the solid arrow indicates the flow path of the air-dissolved pressurized water.

図２、図４に示すように、まず、ノズル本体２０の導入口２３を介して、外部から空気溶解加圧水が減圧管２２内に導入される。この時点における空気溶解加圧水の圧力は、大気圧よりも大きい。 As shown in FIGS. 2 and 4, first, air-dissolved pressurized water is introduced into the pressure reducing pipe 22 from the outside through the introduction port 23 of the nozzle body 20. The pressure of the air-dissolved pressurized water at this point is higher than the atmospheric pressure.

導入口２３から導入された空気溶解加圧水は、導入口２３よりも開口面積が小さい入口側開口部２４を通過する。これにより、空気溶解加圧水の流速が上昇し、空気溶解加圧水が大気圧よりも低い圧力まで減圧される（即ちベンチュリー効果による減圧）。空気溶解加圧水が減圧されることにより、空気溶解加圧水に溶解していた空気が析出し、微細気泡の元になる気泡（気泡核とも言う）が発生する。 The air-dissolved pressurized water introduced from the introduction port 23 passes through the inlet side opening 24 having an opening area smaller than that of the introduction port 23. As a result, the flow velocity of the air-dissolved pressurized water increases, and the air-dissolved pressurized water is depressurized to a pressure lower than the atmospheric pressure (that is, decompression due to the Venturi effect). When the air-dissolved pressurized water is depressurized, the air dissolved in the air-dissolved pressurized water is precipitated, and bubbles (also referred to as bubble nuclei) that are the source of fine bubbles are generated.

そして、本実施例では、減圧管２２に連通孔３０が開口されているため、空気溶解加圧水が入口側開口部２４を通過することに伴うベンチュリー効果によって減圧管２２内に負圧が生じる場合に、その負圧によって、外部から連通孔３０を通って空気溶解加圧水が減圧管２２内に引き込まれる。図４に示すように、連通孔３０から減圧管２２内に引き込まれた空気溶解加圧水は、減圧管２２内を入口側開口部２４から出口側開口部２６に向けて流れる空気溶解加圧水のうちの減圧管２２内周壁付近の空気溶解加圧水の流れと衝突する。その結果、内周壁付近の流速が径方向中心付近の流速よりも遅くなる。内周壁付近と中心付近の流速差が大きくなることで、微細気泡の元になる気泡核がより多く生じる。 Then, in the present embodiment, since the communication hole 30 is opened in the pressure reducing pipe 22, when the negative pressure is generated in the pressure reducing pipe 22 due to the Venturi effect caused by the air-dissolved pressurized water passing through the inlet side opening 24. Due to the negative pressure, air-dissolved pressurized water is drawn into the pressure reducing pipe 22 from the outside through the communication hole 30. As shown in FIG. 4, the air-dissolved pressurized water drawn into the pressure reducing pipe 22 from the communication hole 30 is among the air-dissolved pressurized water flowing in the pressure reducing pipe 22 from the inlet side opening 24 toward the outlet side opening 26. It collides with the flow of air-dissolved pressurized water near the inner peripheral wall of the pressure reducing pipe 22. As a result, the flow velocity near the inner peripheral wall becomes slower than the flow velocity near the radial center. As the difference in flow velocity between the vicinity of the inner peripheral wall and the vicinity of the center increases, more bubble nuclei, which are the sources of fine bubbles, are generated.

上記の通り、本実施例では、減圧管２２は、入口側開口部２４から出口側開口部２６に向けて流路面積が増加するように形成されている。そのため、入口側開口部２４を通過したことで減圧された減圧管２２内の空気溶解加圧水が入口側開口部２４から出口側開口部２６に向かって減圧管２２内を流れる間に、空気溶解加圧水の流速が低下する。流速が低下する結果、空気溶解加圧水が増圧される。空気溶解加圧水が増圧されることにより、空気溶解加圧水に含まれる気泡の一部が分裂して微細気泡になる。 As described above, in the present embodiment, the pressure reducing pipe 22 is formed so that the flow path area increases from the inlet side opening 24 toward the outlet side opening 26. Therefore, the air-dissolved pressurized water in the pressure reducing pipe 22 that has been decompressed by passing through the inlet side opening 24 flows through the pressure reducing pipe 22 from the inlet side opening 24 toward the outlet side opening 26. Flow velocity decreases. As a result of the decrease in the flow velocity, the pressure of the air-dissolved pressurized water is increased. When the pressure of the air-dissolved pressurized water is increased, some of the bubbles contained in the air-dissolved pressurized water are split into fine bubbles.

出口側開口部２６に向かって減圧管２２内を流れてきた空気溶解加圧水は、出口側開口部２６から流路空間６２内へと排出される。上記の通り、流路空間６２の流路面積は、出口側開口部２６の流路面積より大きい。そのため、出口側開口部２６を通って流路空間６２内へと排出された空気溶解加圧水の流速はさらに低下する。これにより、空気溶解加圧水はさらに増圧される。その結果、空気溶解加圧水に含まれる気泡の一部がさらに分裂して微細気泡になる。 The air-dissolved pressurized water that has flowed through the pressure reducing pipe 22 toward the outlet-side opening 26 is discharged from the outlet-side opening 26 into the flow path space 62. As described above, the flow path area of the flow path space 62 is larger than the flow path area of the outlet side opening 26. Therefore, the flow velocity of the air-dissolved pressurized water discharged into the flow path space 62 through the outlet side opening 26 is further reduced. As a result, the pressure of the air-dissolved pressurized water is further increased. As a result, some of the bubbles contained in the air-dissolved pressurized water are further divided into fine bubbles.

また、流路空間６２内へと排出された空気溶解加圧水は、円板部４６に衝突する。この際、流路空間６２内へと排出された空気溶解加圧水の一部は、突出部４９に衝突した後で円板部４６に衝突する。これにより、空気溶解加圧水が流れる向きが変更されるとともに、空気溶解加圧水の流速がさらに低下する。空気溶解加圧水がさらに増圧され、結果として、空気溶解加圧水に含まれる気泡の一部がさらに分裂して微細気泡になる。 Further, the air-dissolved pressurized water discharged into the flow path space 62 collides with the disk portion 46. At this time, a part of the air-dissolved pressurized water discharged into the flow path space 62 collides with the protruding portion 49 and then collides with the disc portion 46. As a result, the direction in which the air-dissolved pressurized water flows is changed, and the flow velocity of the air-dissolved pressurized water is further reduced. The pressure of the air-dissolved pressurized water is further increased, and as a result, some of the bubbles contained in the air-dissolved pressurized water are further divided into fine bubbles.

円板部４６に衝突した後の空気溶解加圧水は、通路６４を通過して流路空間６６内へと排出される。上記の通り、通路６４の流路面積は、流路空間６２のどの部分の流路面積よりも大きい。そして、流路空間６６の流路面積は、通路６４の流路面積よりも大きい。そのため、通路６４を通過して流路空間６６内へと排出された空気溶解加圧水の流速はさらに低下する。空気溶解加圧水がさらに増圧され、結果として、空気溶解加圧水に含まれる気泡の一部がさらに分裂して微細気泡になる。 The air-dissolved pressurized water after colliding with the disk portion 46 passes through the passage 64 and is discharged into the flow path space 66. As described above, the flow path area of the passage 64 is larger than the flow path area of any part of the flow path space 62. The flow path area of the flow path space 66 is larger than the flow path area of the passage 64. Therefore, the flow velocity of the air-dissolved pressurized water that has passed through the passage 64 and is discharged into the flow path space 66 is further reduced. The pressure of the air-dissolved pressurized water is further increased, and as a result, some of the bubbles contained in the air-dissolved pressurized water are further divided into fine bubbles.

そして、流路空間６６内へと排出された空気溶解加圧水は、鍔部２８の前面２８ａに衝突する。これにより、空気溶解加圧水が流れる向きが変更されるとともに、空気溶解加圧水の流速がさらに低下する。空気溶解加圧水もさらに増圧される。その結果、空気溶解加圧水に含まれる気泡の一部がさらに分裂して微細気泡になる。 Then, the air-dissolved pressurized water discharged into the flow path space 66 collides with the front surface 28a of the collar portion 28. As a result, the direction in which the air-dissolved pressurized water flows is changed, and the flow velocity of the air-dissolved pressurized water is further reduced. The pressure of air-dissolved pressurized water is further increased. As a result, some of the bubbles contained in the air-dissolved pressurized water are further divided into fine bubbles.

鍔部２８の前面２８ａに衝突した後の空気溶解加圧水は、通路６８を通過し、流出口５０から流出箇所（浴槽等）に向けて流出する。上記の通り、通路６８の流路面積は、流路空間６６のどの部分の流路面積よりも大きい。通路６８を通過する空気溶解加圧水の流速はさらに低下する。そして、流出箇所に空気溶解加圧水が流出されることにより、空気溶解加圧水の流速がさらに低下し、空気溶解加圧水はさらに増圧される。その結果、空気溶解加圧水に含まれる気泡の一部がさらに分裂して微細気泡になる。 The air-dissolved pressurized water after colliding with the front surface 28a of the flange portion 28 passes through the passage 68 and flows out from the outflow port 50 toward the outflow point (bathtub or the like). As described above, the flow path area of the passage 68 is larger than the flow path area of any part of the flow path space 66. The flow velocity of the air-dissolved pressurized water passing through the passage 68 is further reduced. Then, when the air-dissolved pressurized water flows out to the outflow location, the flow velocity of the air-dissolved pressurized water is further reduced, and the pressure of the air-dissolved pressurized water is further increased. As a result, some of the bubbles contained in the air-dissolved pressurized water are further divided into fine bubbles.

以上、本実施例の微細気泡発生ノズル１０の構成及び作用について説明した。上記の通り、本実施例では、ノズル本体２０の減圧管２２に連通孔３０が開口されているため、ベンチュリー効果によって減圧管２２内に生じる負圧によって連通孔３０を通って外部から空気溶解加圧水が減圧管２２内に引き込まれる。その結果、連通孔３０から引き込まれた空気溶解加圧水が、減圧管２２内を入口側開口部２４から出口側開口部２６に向けて流れる内周壁付近の空気溶解加圧水の流れと衝突し、内周壁付近の流速が径方向中心付近の流速よりも遅くなる（図４参照）。内周壁付近と中心付近の流速差が大きくなることで、微細気泡の元になる気泡核がより多く生じる。その結果、本実施例の微細気泡発生ノズル１０によると、流出箇所に流出される空気溶解加圧水には、微細気泡を大量に含ませることができる。 The configuration and operation of the fine bubble generating nozzle 10 of this embodiment have been described above. As described above, in this embodiment, since the communication hole 30 is opened in the pressure reducing pipe 22 of the nozzle body 20, the negative pressure generated in the pressure reducing pipe 22 due to the Venturi effect causes the air-dissolved pressurized water to pass through the communication hole 30 from the outside. Is drawn into the pressure reducing pipe 22. As a result, the air-dissolved pressurized water drawn from the communication hole 30 collides with the flow of the air-dissolved pressurized water near the inner peripheral wall flowing from the inlet side opening 24 toward the outlet side opening 26 in the pressure reducing pipe 22, and the inner peripheral wall. The flow velocity in the vicinity becomes slower than the flow velocity in the vicinity of the radial center (see FIG. 4). As the difference in flow velocity between the vicinity of the inner peripheral wall and the vicinity of the center increases, more bubble nuclei, which are the sources of fine bubbles, are generated. As a result, according to the fine bubble generating nozzle 10 of this embodiment, the air-dissolved pressurized water flowing out to the outflow portion can contain a large amount of fine bubbles.

また、本実施例では、連通孔３０の開口面積は、入口側開口部２４の開口面積よりも小さい。そのため、連通孔３０の開口面積が入口側開口部２４の開口面積以上である構成を採用する場合に比べて、減圧管２２内で発生する負圧によって外部から連通孔３０を通って減圧管２２内に空気溶解加圧水が引き込まれ易くなる。即ち、減圧管２２内で発生する負圧を有効に働かせることができる。 Further, in this embodiment, the opening area of the communication hole 30 is smaller than the opening area of the entrance side opening 24. Therefore, as compared with the case where the opening area of the communication hole 30 is equal to or larger than the opening area of the inlet side opening 24, the pressure reducing pipe 22 passes through the communication hole 30 from the outside due to the negative pressure generated in the pressure reducing pipe 22. Air-dissolved pressurized water is easily drawn into the inside. That is, the negative pressure generated in the pressure reducing pipe 22 can be effectively used.

また、本実施例では、連通孔３０が形成されている部分（即ち特定部分）における減圧管２２の開口面積は、入口側開口部２４の開口面積とほぼ等しい。即ち、本実施例では、入口側開口部２４から見た開口面積の増分がほぼない範囲内に連通孔３０が形成される。このような特定部分を通過する空気溶解加圧水には比較的大きい負圧が生じる。そのため、連通孔３０を通って外部から減圧管２２内に空気溶解加圧水が引き込まれやすくなる。減圧管２２内で発生する負圧をより有効に働かせることができる。 Further, in this embodiment, the opening area of the pressure reducing pipe 22 in the portion where the communication hole 30 is formed (that is, the specific portion) is substantially equal to the opening area of the inlet side opening 24. That is, in this embodiment, the communication hole 30 is formed within a range in which there is almost no increase in the opening area as seen from the inlet side opening 24. A relatively large negative pressure is generated in the air-dissolved pressurized water passing through such a specific portion. Therefore, the air-dissolved pressurized water is easily drawn into the pressure reducing pipe 22 from the outside through the communication hole 30. The negative pressure generated in the pressure reducing pipe 22 can be used more effectively.

以上、実施例について詳細に説明したが、これらは例示に過ぎず、特許請求の範囲を限定するものではない。特許請求の範囲に記載の技術には、以上に例示した具体例を様々に変形、変更したものが含まれる。 Although the examples have been described in detail above, these are merely examples and do not limit the scope of claims. The techniques described in the claims include various modifications and modifications of the specific examples illustrated above.

（変形例１）上記の実施例では、連通孔３０が形成されている部分（即ち特定部分）における減圧管２２の開口面積は、入口側開口部２４の開口面積とほぼ等しい。これに限られず、連通孔３０が形成されている部分（即ち特定部分）における減圧管２２の開口面積は、入口側開口部２４の開口面積以上であって１１０％以内であればよい。即ち、減圧管２２のうち、入口側開口部２４から見た開口面積の増分が１０％以内である範囲内に連通孔３０が形成されればよい。この範囲も、依然として入口側開口部２４の通過直後の範囲であるため、この範囲を通過する空気溶解加圧水には比較的大きい負圧が生じる。 (Modification 1) In the above embodiment, the opening area of the pressure reducing pipe 22 in the portion where the communication hole 30 is formed (that is, the specific portion) is substantially equal to the opening area of the inlet side opening 24. Not limited to this, the opening area of the pressure reducing pipe 22 in the portion where the communication hole 30 is formed (that is, the specific portion) may be equal to or larger than the opening area of the inlet side opening 24 and may be 110% or less. That is, the communication hole 30 may be formed in the pressure reducing pipe 22 within a range in which the increment of the opening area as seen from the inlet side opening 24 is within 10%. Since this range is still the range immediately after passing through the inlet side opening 24, a relatively large negative pressure is generated in the air-dissolved pressurized water passing through this range.

（変形例２）上記の実施例では、各入口側開口部２４よりも下流側であって、各入口側開口部２４の通過直後の部分（特定部分）に、減圧管２２の外周壁と内周壁とを連通する連通孔３０が１個ずつ開口されている。これに限られず、変形例では、特定部分において、減圧管２２の径方向に沿って複数個の連通孔３０が開口されていてもよい。その場合、複数個の連通孔３０の合計開口面積が入口側開口部２４の開口面積より小さければよい。 (Modification 2) In the above embodiment, the outer peripheral wall and the inner side of the pressure reducing pipe 22 are located on the downstream side of each inlet side opening 24 and immediately after passing through each inlet side opening 24 (specific portion). Communication holes 30 that communicate with the peripheral wall are opened one by one. Not limited to this, in the modified example, a plurality of communication holes 30 may be opened along the radial direction of the pressure reducing pipe 22 at a specific portion. In that case, the total opening area of the plurality of communication holes 30 may be smaller than the opening area of the inlet side opening 24.

（変形例３）さらに、変形例では、連通孔３０の開口面積が入口側開口部２４の開口面積以上であってもよい。 (Modified Example 3) Further, in the modified example, the opening area of the communication hole 30 may be equal to or larger than the opening area of the inlet side opening 24.

（変形例４）上記の各実施例では、微細気泡発生ノズルは、空気が水に溶解した空気溶解加圧水の供給を受け、空気溶解加圧水内の空気を析出させて微細気泡に変え、空気の微細気泡を含む水を流出箇所に供給する。これに限られず、微細気泡発生ノズルは、空気以外の他の気体（例えば、炭酸ガスや水素等）が水に溶解した気体溶解加圧水の供給を受け、当該気体溶解加圧水内の気体を析出させて微細気泡に変え、その期待の微細気泡を含む水を流出箇所に供給するようにしてもよい。即ち、「気体」は空気に限られず、炭酸ガスや水素等の任意の気体であってもよい。 (Modification 4) In each of the above embodiments, the fine bubble generating nozzle receives the supply of air-dissolved pressurized water in which air is dissolved in water, precipitates the air in the air-dissolved pressurized water and changes it into fine bubbles, and the air is fine. Supply water containing air bubbles to the outflow point. Not limited to this, the fine bubble generation nozzle receives the supply of gas-dissolved pressurized water in which a gas other than air (for example, carbon dioxide gas, hydrogen, etc.) is dissolved in water, and precipitates the gas in the gas-dissolved pressurized water. It may be changed to fine bubbles and water containing the expected fine bubbles may be supplied to the outflow point. That is, the "gas" is not limited to air, and may be any gas such as carbon dioxide or hydrogen.

本明細書または図面に説明した技術要素は、単独であるいは各種の組合せによって技術的有用性を発揮するものであり、出願時の請求項に記載の組合せに限定されるものではない。また、本明細書または図面に例示した技術は複数目的を同時に達成し得るものであり、そのうちの一つの目的を達成すること自体で技術的有用性を持つものである。 The technical elements described herein or in the drawings exhibit their technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the techniques illustrated in the present specification or drawings can achieve a plurality of purposes at the same time, and achieving one of the purposes itself has technical usefulness.

１０：微細気泡発生ノズル
２０：ノズル本体
２２：減圧管
２２ａ：上流側端部
２２ｂ：下流側端部
２３：導入口
２４：入口側開口部
２５：区画壁
２６：出口側開口部
２８：鍔部
２８ａ：前面
３０：連通孔
４０：ホルダ部
４２：外側円筒部
４３：段差
４４：内側円筒部
４６：円板部
４８：接続部
４９：突出部
５０：流出口
５２：連結部
６２：流路空間
６４：通路
６６：流路空間
６８：通路
Ｂ：ネジ穴 10: Fine bubble generation nozzle 20: Nozzle body 22: Pressure reducing pipe 22a: Upstream side end 22b: Downstream side end 23: Introducing port 24: Inlet side opening 25: Partition wall 26: Outlet side opening 28: Brim 28a: Front surface 30: Communication hole 40: Holder portion 42: Outer cylindrical portion 43: Step 44: Inner cylindrical portion 46: Disk portion 48: Connection portion 49: Protruding portion 50: Outlet 52: Connecting portion 62: Flow path space 64: Passage 66: Flow path space 68: Passage B: Screw hole

Claims (3)

上流側端部から下流側端部に向けて、気体が水に溶解している気体溶解加圧水を通過させる減圧管と、
前記上流側端部に開口され、外部から前記減圧管内に前記気体溶解加圧水を導入する導入口と、
前記減圧管のうち前記導入口よりも下流側に設けられ、前記減圧管内に導入された前記気体溶解加圧水を通過させる入口側開口部と、
前記入口側開口部よりも下流側である前記下流側端部に開口された出口側開口部と、
を備えており、
前記入口側開口部の開口面積は前記導入口の開口面積よりも小さく、
前記出口側開口部の開口面積は前記入口側開口部の開口面積よりも大きく、
前記減圧管のうち、前記入口側開口部よりも下流側であって前記入口側開口部近傍の特定部分に、前記減圧管の外周壁と内周壁とを連通する少なくとも１個の連通孔が開口されている、
微細気泡発生ノズル本体。 A decompression pipe that allows gas-dissolved pressurized water in which gas is dissolved in water to pass from the upstream end to the downstream end.
An introduction port that is opened at the upstream end and introduces the gas-dissolved pressurized water into the pressure reducing pipe from the outside.
An inlet side opening provided in the pressure reducing pipe on the downstream side of the introduction port and for passing the gas-dissolved pressurized water introduced into the pressure reducing pipe.
An outlet-side opening opened at the downstream end, which is downstream of the inlet-side opening,
Is equipped with
The opening area of the inlet side opening is smaller than the opening area of the introduction port.
The opening area of the outlet side opening is larger than the opening area of the entrance side opening.
At least one communication hole for communicating the outer peripheral wall and the inner peripheral wall of the pressure reducing pipe is opened in a specific portion of the pressure reducing pipe on the downstream side of the inlet side opening and in the vicinity of the inlet side opening. Has been,
Fine bubble generation nozzle body. 前記少なくとも１個の連通孔の合計開口面積は、前記入口側開口部の開口面積よりも小さい、請求項１に記載の微細気泡発生ノズル本体。 The fine bubble generating nozzle body according to claim 1, wherein the total opening area of the at least one communication hole is smaller than the opening area of the inlet side opening. 前記特定部分における前記減圧管の開口面積は、前記入口側開口部の開口面積以上であって１１０％以内である、請求項１又は２に記載の微細気泡発生ノズル本体。 The fine bubble generating nozzle body according to claim 1 or 2, wherein the opening area of the pressure reducing pipe in the specific portion is equal to or larger than the opening area of the inlet side opening and is within 110%.
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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06315654A (en) * 1993-04-30 1994-11-15 Nobuyuki Ishimatsu Water saving device for shower head
JPH1190275A (en) * 1997-09-17 1999-04-06 Hiroshi Saito Negative pressure fine-foam generator
JP2012176335A (en) * 2011-02-25 2012-09-13 Seiwa Kogyo Kk Microbubble generator
JP2014024012A (en) * 2012-07-27 2014-02-06 Mitsubishi Electric Corp Ejector
JP2015100720A (en) * 2013-11-21 2015-06-04 スプレーイングシステムスジャパン株式会社 Air-spraying microbubble nozzle
JP2019136648A (en) * 2018-02-09 2019-08-22 リンナイ株式会社 Cleaning liquid generator

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06315654A (en) * 1993-04-30 1994-11-15 Nobuyuki Ishimatsu Water saving device for shower head
JPH1190275A (en) * 1997-09-17 1999-04-06 Hiroshi Saito Negative pressure fine-foam generator
JP2012176335A (en) * 2011-02-25 2012-09-13 Seiwa Kogyo Kk Microbubble generator
JP2014024012A (en) * 2012-07-27 2014-02-06 Mitsubishi Electric Corp Ejector
JP2015100720A (en) * 2013-11-21 2015-06-04 スプレーイングシステムスジャパン株式会社 Air-spraying microbubble nozzle
JP2019136648A (en) * 2018-02-09 2019-08-22 リンナイ株式会社 Cleaning liquid generator

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