Water discharge component

Abstract

To provide a water discharge component that can stably discharge water containing ultrafine bubbles and offers excellent flexibility in water discharge. [Solution] The water discharge member 16 includes a first water discharge section s1 having a first water discharge hole h1 which is the outlet of a first flow path f1, a second water discharge section s2 having a second water discharge hole h2 which is the outlet of a second flow path f2, an outlet switching section 52 that switches between water discharge from the first water discharge section s1 and water discharge from the second water discharge section s2, an ultrafine bubble generating section UF1 provided in the first flow path f1 that generates ultrafine bubbles, a bypass flow path b1 provided separately from the ultrafine bubble generating section UF1 within the first flow path f1, and a confluence section g1 provided inside the first water discharge section s1 where water that has passed through the ultrafine bubble generating section UF1 and water that has passed through the bypass flow path b1 merge.

Description

Technical Field

[0001] The present disclosure relates to a water discharging member.

Background Art

[0002] Various water discharging members such as faucets, shower heads, and sprinkler nozzles are known. Japanese Unexamined Patent Application Publication No. 2013-252396 discloses a shower head including a microbubble generating portion in which microbubble holes and large holes are formed, and a spraying portion having spraying holes for spraying the liquid that has passed through the microbubble generating portion to the outside. In this shower head, when increasing the discharge amount, the rotation operation portion is operated to open the closed large holes. By opening the large holes, the water that has passed through the microbubble holes and the water that has passed through the large holes are mixed and discharged in the form of shower water from the spraying portion.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The microbubble holes described in Patent Document 1 are through holes having a small diameter and a tapered shape, and generate microbubbles due to a pressure change. At the time of low flow rate when the large holes are closed, only the water flow from the microbubble holes is discharged inside the screen, so an imbalance in pressure easily occurs inside the screen. When an imbalance in pressure occurs inside the screen, the water shape is disturbed. Further, in the shower head described in Patent Document 1, the water discharge is only of one type from the shower screen.

[0005] An example of the object of the present disclosure is to provide a water discharging member that can stably discharge water containing ultrafine bubbles and has excellent freedom in water discharge.

Means for Solving the Problems

[0006] In one embodiment, the water discharge member includes a first water discharge section having a first water discharge hole which is the outlet of a first flow path, a second water discharge section having a second water discharge hole which is the outlet of a second flow path, an outlet switching section that switches between water discharged from the first water discharge section and water discharged from the second water discharge section, an ultrafine bubble generating section provided in the first flow path for generating ultrafine bubbles, a bypass flow path provided separately from the ultrafine bubble generating section in the first flow path, and a confluence section provided inside the first water discharge section for the water that has passed through the ultrafine bubble generating section and the water that has passed through the bypass flow path to merge. [Effects of the Invention]

[0007] In one respect, it is possible to provide a water discharge component that can stably discharge water containing ultrafine bubbles and offers excellent flexibility in water discharge. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a perspective view of a faucet device equipped with a water discharge member according to the first embodiment. [Figure 2] Figure 2 is a perspective view of the water outlet head in the faucet device shown in Figure 1. [Figure 3] Figure 3 is a cross-sectional view of the water outlet head shown in Figure 2. [Figure 4] Figure 4 is an exploded perspective view of the discharge section of the water outlet head shown in Figure 2. [Figure 5] Figure 5 is a cross-sectional view of the discharge section. [Figure 6] Figure 6, like Figure 5, is a cross-sectional view of the discharge section. The position of the cross-section differs between Figure 5 and Figure 6. [Figure 7] Figure 7 is a partial cross-sectional perspective view of the discharge section. [Figure 8] Figure 8(a) is a perspective view of the annular member according to the first embodiment, Figure 8(b) is a plan view of the annular member, Figure 8(c) is a bottom view of the annular member, and Figure 8(d) is a side view of the annular member. [Figure 9] Figure 9(a) is a perspective view of the lid member according to the first embodiment, Figure 9(b) is a plan view of the lid member, Figure 9(c) is a bottom view of the lid member, and Figure 9(d) is a side view of the lid member. [Figure 10] Figure 10(a) is a perspective view of the annular body comprising the annular member and the lid member, Figure 10(b) is a plan view of the annular body, Figure 10(c) is a bottom view of the annular body, and Figure 10(d) is a side view of the annular body. [Figure 11] Figure 11 is an enlarged view of Figure 8(b). [Figure 12] Figure 12(a) is a partially enlarged view of Figure 11, and Figure 12(b) is an explanatory diagram showing the configuration of the inflow channel shown in Figure 12(a). [Figure 13] Figure 13 is a cross-sectional view of the discharge section, similar to Figure 6. [Figure 14] Figure 14 is an enlarged cross-sectional view of the swirling flow formation section. [Figure 15] Figure 15(a) is a perspective view of the annular member according to the second embodiment, Figure 15(b) is a plan view of the annular member, Figure 15(c) is a bottom view of the annular member, and Figure 15(d) is a side view of the annular member. [Figure 16] Figure 16(a) is a perspective view of an annular member relating to a faucet device of the third embodiment, Figure 16(b) is a plan view of the annular member, Figure 16(c) is a bottom view of the annular member, and Figure 16(d) is a side view of the annular member. [Figure 17] Figure 17 is a schematic diagram showing the shower water pattern when the water pattern evaluation is "◎" or "○". [Figure 18] Figure 18 is a schematic diagram showing the shower water pattern when the water pattern evaluation is "×". [Figure 19] Figure 19(a) is a simulation image showing the pressure distribution at the confluence when a bypass channel is present. Figure 19(b) is a simulation image showing the pressure distribution at the confluence when a bypass channel is absent. [Modes for carrying out the invention]

[0009] Hereinafter, embodiments will be described in detail while appropriately referring to the drawings. In each embodiment, the same or common elements are denoted by the same reference numerals, and duplicate explanations are omitted as appropriate.

[0010] In this specification, "upper side", "lower side", and "vertical direction" mean the "upper side", "lower side", and "vertical direction" in the posture when the water discharge head of the following embodiments is used. These terms are interpreted according to the posture when the water discharge member is used.

[0011] Unless otherwise specified, in this specification, the "circumferential direction" means the circumferential direction of the annular body 84 in the embodiments described later. Unless otherwise specified, in this specification, the "radial direction" means the radial direction of the annular body 84 in the embodiments described later. Unless otherwise specified, in this specification, the "axial direction" means the direction of the center line of the annular body 84 in the embodiments described later.

[0012] Unless otherwise specified, in this specification, "plan view" means a plan view of the annular member 80, the lid member 82, or the annular body 84 described later.

[0013] FIG. 1 is a perspective view of a faucet device 10 including a water discharge member according to the first embodiment. The faucet device 10 has a faucet body 12, a handle 14, a water discharge head 16, a hot water introduction pipe 18, a cold water introduction pipe 20, and a discharge pipe 22. The water discharge head 16 has a head portion 24 and a spout portion 26. The head portion 24 has a water discharge hole 27.

[0014] The faucet device 10 is a hot and cold water mixing faucet. The faucet device 10 is a single lever type hot and cold water mixing faucet. By rotating the handle 14 left and right, the temperature of the discharged water can be adjusted. By rotating the handle 14 up and down, the amount of discharged water can be adjusted. Inside the faucet body 12, a valve mechanism that enables temperature adjustment and adjustment of the amount of discharged water is built in.

[0015] The water discharge components of this disclosure include, in addition to the water discharge head 16 in a sink faucet device such as the faucet device 10, the discharge part of a washbasin faucet device, the shower head of a bathroom faucet device, and a watering nozzle for gardening or cleaning.

[0016] Figure 2 is a perspective view of the water outlet head 16, and Figure 3 is a cross-sectional view of the water outlet head 16.

[0017] The faucet device 10 has a water purification function unit 32 that has a water purification function. In this embodiment, this water purification function unit 32 is contained in a water purification cartridge 30. The water purification cartridge 30 is provided on the water outlet head 16. As described above, the water outlet head 16 has a spout 26. As shown in Figure 3, a cartridge placement section 28 is provided inside the spout 26. The cartridge placement section 28 is a space that can accommodate the water purification cartridge 30. The water purification cartridge 30 is placed in the cartridge placement section 28. The head 24 is detachable from the spout 26. By removing the head 24 from the spout 26, the water purification cartridge 30 can be replaced.

[0018] As shown in Figure 3, a raw water channel GW is formed between the inner surface of the spout 26 and the outer surface of the water purification cartridge 30. A purified water channel JW is also formed inside the water purification cartridge 30. The spout head 16, with the water purification cartridge 30 built into the spout 26, constitutes a faucet-integrated water purifier. The faucet device 10 includes this faucet-integrated water purifier. Note that the faucet device 10 does not necessarily have a water purification function.

[0019] The water purification cartridge 30 has a water purification function unit 32 equipped with activated carbon and a connection end 34 located downstream of the water purification function unit 32. The water purification function unit 32 has activated carbon molded into a cylindrical shape. A raw water flow path GW is formed along the outer surface of the water purification function unit 32. A purified water flow path JW is formed inside the water purification function unit 32. Water permeates from the outer surface to the interior of the water purification function unit 32 and is purified by passing through the water purification function unit 32. The purified water passes through the purified water flow path JW and flows from the connection end 34 to the downstream flow path.

[0020] The head unit 24 (discharge head 16) has an operating unit 40 and a purified raw water switching unit 42. The purified raw water switching unit 42 is built into the head unit 24. The operating unit 40 and the purified raw water switching unit 42 are interlocked with each other. When the operating unit 40 is operated, the purified raw water switching unit 42 switches between discharging raw water and discharging purified water. The purified raw water switching unit 42 constitutes a switching mechanism including a switching valve 44. The switching valve 44 includes a raw water valve 44a that opens and closes the raw water flow path GW and a purified water valve 44b that opens and closes the purified water flow path JW. When the raw water valve 44a opens and the purified water valve 44b closes, raw water is discharged. When the raw water valve 44a closes and the purified water valve 44b opens, purified water is discharged.

[0021] The purified water switching unit 42 has an alternate-operating thrust lock mechanism 46. The purified water switching unit 42 is operated by an operating unit 40. The operating unit 40 is configured as a push button. The operating unit 40 performs alternate operation in conjunction with the purified water switching unit 42. Each time the operating unit 40 is pressed, the system switches between discharging raw water and purified water. When the operating unit 40 is pressed in the protruding position, the operating unit 40 moves to the retracted position via the pushed-in position. The pushed-in position is a position that is even further retracted than the retracted position. When the operating unit 40 is pressed in the retracted position, the operating unit 40 moves to the protruding position via the pushed-in position. The pushed-in position is passed through due to an overstroke during switching. In this embodiment, raw water is discharged when the operating unit 40 is in the protruding position, and purified water is discharged when the operating unit 40 is in the retracted position.

[0022] The head portion 24 (water discharge head 16) has a discharge portion 50. The discharge portion 50 is the part that includes the water discharge hole 27. Water is discharged from the water discharge hole 27 of the discharge portion 50.

[0023] As shown in Figure 2, the discharge port 27 has a first discharge port h1 and a second discharge port h2. The first discharge port h1 is positioned around the second discharge port h2. In this embodiment, the discharge port 27 is composed of the first discharge port h1 and the second discharge port h2. Other discharge ports besides the first discharge port h1 and the second discharge port h2 may be provided.

[0024] The first discharge port h1 differs from the second discharge port h2. In other words, the specifications of the holes differ between the first discharge port h1 and the second discharge port h2. These specifications include, for example, the diameter of the hole, the length of the hole, the shape of the vertical cross-section of the hole, and the shape of the cross-section of the hole.

[0025] The first water outlet h1 is provided in the first water outlet section s1. The second water outlet h2 is provided in the second water outlet section s2. The water pattern differs between the water discharged from the first water outlet section s1 and the water discharged from the second water outlet section s2. The first water outlet h1 is a plurality of shower holes. The water discharged from the first water outlet section s1 forms a shower pattern. That is, the first water pattern formed by the water discharged from the first water outlet section s1 is a shower pattern. The water discharged from the second water outlet section s2 forms a straight pattern. That is, the second water pattern formed by the water discharged from the second water outlet section s2 is a straight pattern. The water pattern of the water discharged from the first water outlet section s1 (first water pattern) is not limited. The water pattern of the water discharged from the second water outlet section s2 (second water pattern) is not limited.

[0026] The discharge section 50 (head section 24) constitutes the outlet switching section 52. The outlet switching section 52 has a switching operation section 54. The switching operation section 54 is a switching lever. By operating the switching operation section 54, the outlet switching section 52 can be rotated left or right by a predetermined angle. This rotation allows the switching operation section 54 to be switched between two alternate rotation positions. The outlet switching section 52 switches between water discharge from the first water discharge section s1 and water discharge from the second water discharge section s2. This switching is possible by operating (rotating) the switching operation section 54. This switching is alternate. When water is being discharged from the first water discharge section s1, water is not discharged from the second water discharge section s2. When water is being discharged from the second water discharge section s2, water is not discharged from the first water discharge section s1.

[0027] Figure 4 is an exploded perspective view of the discharge section 50 (outlet switching section 52). The discharge section 50 (outlet switching section 52) has a switching operation section 54, a screen member 56, and a switching plate 58. The switching operation section 54 is an annular member. The switching operation section 54 forms the outer circumferential surface of the discharge section 50 (outlet switching section 52). The screen member 56 has a central cylindrical section 60 formed in the center of the screen member 56, a screen 62, and an outer circumferential wall 63. The outlet of the flow path formed inside the central cylindrical section 60 forms the second discharge hole h2. The screen 62 extends in an annular shape. The screen 62 forms the first discharge hole h1 (shower hole h10). The central cylindrical section 60 functions as a partition wall separating the first flow path f1 and the second flow path f2. The first flow path f1 and the second flow path f2 will be described later.

[0028] A lever 64 is provided on the screen member 56. By fixing the screen member 56 to the switching operation unit 54, the lever 64 functions as part of the switching operation unit 54. The switching plate 58 has a plurality of communication holes 74. Furthermore, the discharge unit 50 (outlet switching unit 52) ​​has a flow straightening adapter 68, a flow straightening mesh 70, and a plurality of sealing members e1.

[0029] When the switching operation unit 54 is rotated, the entire outlet switching unit 52 rotates together with the switching operation unit 54. Therefore, when the switching operation unit 54 rotates, the switching plate 58 also rotates. The switching plate 58 has multiple communication holes 74, including a first communication hole 74a that communicates with the first flow path f1 and a second communication hole 74b that communicates with the second flow path f2. In the circumferential direction of the switching plate 58, the first communication holes 74a and the second communication holes 74b are arranged alternately. When the switching operation unit 54 (switching plate 58) is in the first rotation position, only the first communication hole 74a is connected to the upstream flow path, and water flows into the first flow path f1. As a result, water is discharged from the first discharge hole h1. When the switching operation unit 54 (switching plate 58) is in the second rotation position, only the second communication hole 74b is connected to the upstream flow path, and water flows into the second flow path f2. As a result, water is discharged from the second discharge port h2. In this way, the outlet switching unit 52 (switching plate 58) switches whether to let water flow into the first flow path f1 or the second flow path f2. The first flow path f1 and the second flow path f2 will be described later. The outlet switching unit 52 is located downstream of the purified water switching unit 42.

[0030] Figures 5 and 6 are enlarged cross-sectional views of the discharge section 50 (outlet switching section 52). Both Figures 5 and 6 are cross-sectional views along the rotational centerline of the outlet switching section 52, but the circumferential position of the cross-section differs between Figure 5 and Figure 6. This circumferential direction refers to the rotational direction of the outlet switching section 52. Figure 5 is a cross-sectional view at a position where the swirling flow forming section 116 (described later) is not present, and Figure 6 is a cross-sectional view at a position where the swirling flow forming section 116 is present. Figure 7 is a partial cross-sectional perspective view showing the same cross-section as Figure 6.

[0031] The discharge section 50 has a first water discharge hole h1 and a first flow path f1 that exits through the first water discharge hole h1. Water flowing into the first flow path f1 from the upstream side is discharged to the outside from the first water discharge hole h1. Water flowing into the first flow path f1 from the upstream side is discharged only from the first water discharge hole h1. In this embodiment, there are multiple first water discharge holes h1. In this embodiment, the first water discharge holes h1 are shower holes h10. The water discharged from the first water discharge holes h1 forms a shower stream.

[0032] The discharge section 50 has a first discharge section s1 equipped with a first discharge hole h1. In this embodiment, the first discharge section s1 is a screen 62.

[0033] The discharge section 50 has a second discharge hole h2 and a second flow path f2 that exits through the second discharge hole h2. The second flow path f2 is a separate flow path from the first flow path f1. The second flow path f2 is separated from the first flow path f1. Water flowing into the second flow path f2 from the upstream side is discharged to the outside through the second discharge hole h2. Water flowing into the second flow path f2 from the upstream side is discharged only through the second discharge hole h2. Water does not flow from the second flow path f2 to the first discharge hole h1, nor does it flow from the first flow path f1 to the second discharge hole h2. In this embodiment, there is one second discharge hole h2. In this embodiment, the second discharge hole h2 is a straight hole. The water discharged from the second discharge hole h2 forms a straight stream. The inner diameter (maximum diameter) of the second discharge hole h2 is larger than the inner diameter (maximum diameter) of the first discharge hole h1.

[0034] The discharge section 50 has a second discharge section s2 equipped with a second discharge hole h2. In this embodiment, the second discharge section s2 is a large hole equipped with a flow straightening mesh 70.

[0035] The discharge section 50 has an ultrafine bubble generating section UF1. As described later, the ultrafine bubble generating section UF1 is composed of an annular body 84. The ultrafine bubble generating section UF1 is located in the first flow channel f1. The annular body 84, which serves as the ultrafine bubble generating section UF1, is positioned with the central cylindrical section 60 inserted inside it. A portion of the water flowing through the first flow channel f1 flows into the ultrafine bubble generating section UF1. The water that flows into the ultrafine bubble generating section UF1 becomes a swirling flow. Ultrafine bubbles are generated as the water passes through the ultrafine bubble generating section UF1. The water discharged from the first discharge port h1 has a high concentration of ultrafine bubbles (particle number concentration).

[0036] As is well known, fine bubbles are bubbles with a particle size of less than 100 μm, and the concept includes microbubbles and ultrafine bubbles. Microbubbles are bubbles with a particle size of 1 μm or more and less than 100 μm, while ultrafine bubbles are bubbles with a particle size of less than 1 μm.

[0037] The second channel f2 does not have an ultrafine bubble generating unit UF1. In the second channel f2, no swirling flow that generates ultrafine bubbles is generated. The water discharged from the second discharge port h2 has a lower ultrafine bubble concentration (particle number concentration) compared to the water discharged from the first discharge port h1.

[0038] The particle number concentration may be measured in accordance with the Fine Bubble Industry Association's standards for fine bubble shower heads, "FBIA3-1-1:2019" and "Method for Measuring the Size and Number Concentration of Ultrafine Bubbles (FBIA3-1-1:2017)." The measurement conditions may be as follows. The measurement equipment may be Quantum Design's "NanoSight NS300," and the measurement may be performed using particle trajectory analysis. • Single pass (no loops) • Supply water: Ion-exchanged water (water conforming to the FBIA's definition of ultrapure water) ·Water temperature: normal temperature (28℃) ·Flow rate: 7.0L / min

[0039] The discharge section 50 has a bypass channel b1 provided separately from the ultrafine bubble generation section UF1. The bypass channel b1 is provided within the first channel f1. Within the first channel f1, the bypass channel b1 is provided separately from the channel that passes through the ultrafine bubble generation section UF1. In this embodiment, the bypass channel b1 is the gap 78 between the ultrafine bubble generation section UF1 (annular body 84) and the adjacent surface 76. The gap 78 is the gap between the outer peripheral surface 118 of the annular body 84 and the adjacent surface 76 facing it. The adjacent surface 76 is the surface of the adjacent part adjacent to the ultrafine bubble generation section UF1. The adjacent surface 76 is the surface that defines the first channel f1.

[0040] In Figures 5 and 6, the double arrow W1 indicates the width of the gap 78. The width W1 is the flow path width of the bypass flow path b1. In this embodiment, the width W1 is measured along the radial direction. By adjusting the width W1, the flow rate and the concentration of ultrafine bubbles in the water discharged from the first water discharge section s1 can be adjusted. Since the width W1 is easy to adjust, the flow rate and ultrafine bubble concentration from the first water discharge section s1 can be easily adjusted. From the viewpoint of the water discharge flow rate from the first water discharge section s1 and water shape improvement, the width W1 can be 0.05 mm or more, more preferably 0.06 mm or more, and more preferably 0.07 mm or more. From the viewpoint of ultrafine bubble concentration, the width W1 can be 0.3 mm or less, more preferably 0.2 mm or less, and more preferably 0.1 mm or less. In this first embodiment, the width W1 was set to 0.1 mm. The width W1 may be locally increased, as in the bypass flow path expansion section 172 in the annular member 170 of the second embodiment described later. The width W1 at the location where the bypass channel expansion section 172 is provided may be greater than the preferred upper limit value mentioned above. This bypass channel expansion section 172 is also an example of a structure that adjusts the width W1. This gap width W1 also contributes to facilitating the removal and replacement of the annular body 84.

[0041] The discharge section 50 has a confluence section g1 where water that has passed through the ultrafine bubble generation section UF1 and water that has passed through the bypass channel b1 merge. The confluence section g1 is part of the first channel f1. The confluence section g1 is separated from the second channel f2. The confluence section g1 is a space provided inside the first discharge section s1 (screen 62). This space is an annular space that forms a ring as a whole. The inner surface of the first discharge section s1 (screen 62) faces the confluence section g1. The outlet b10 of the bypass channel b1 faces the confluence section g1. The outlet of water that has passed through the ultrafine bubble generation section UF1 (annular body 84) faces the confluence section g1.

[0042] As described above, in this embodiment, the first water discharge section s1 is an annular screen 62 formed around the second water discharge section s2. The first water discharge holes h1 are a plurality of shower holes h10 provided in the screen 62. The confluence section g1 is an annular space formed along the inner surface of the screen 62. The ultrafine bubble generating section UF1 is an annular body 84 extending in an annular shape along the confluence section g1. The bypass channel b1 is formed radially outward of the annular body 84.

[0043] Figures 8(a) to 10(d) show the components related to the annular body 84, which is the ultrafine bubble generating unit UF1. The annular body 84 is composed of an annular member 80 and a lid member 82.

[0044] Figure 8(a) is a perspective view of the annular member 80, Figure 8(b) is a plan view of the annular member 80, Figure 8(c) is a bottom view of the annular member 80, and Figure 8(d) is a side view of the annular member 80. The annular member 80 has a plurality of swirling channel sections 90 and connecting sections 92 that connect adjacent swirling channel sections 90. Furthermore, the annular member 80 has an outer circumferential surface 94 and an inner circumferential surface 96. In this embodiment, there are 8 swirling channel sections 90. The plurality of swirling channel sections 90 are arranged along the circumferential direction. The plurality of swirling channel sections 90 are arranged at equal intervals in the circumferential direction. The swirling channel section 90 has a swirling hole 130 and an inlet passage 132 formed as the central hole of a cylindrical section projecting upward. The swirling hole 130 and the inlet passage 132 will be described later.

[0045] Figure 9(a) is a perspective view of the lid member 82, Figure 9(b) is a plan view of the lid member 82, Figure 9(c) is a bottom view of the lid member 82, and Figure 9(d) is a side view of the lid member 82. The lid member 82 is used in combination with the annular member 80. The lid member 82 has an annular base 100 and a plurality of water passage holes 102 that penetrate the base 100. Between adjacent water passage holes 102, a lid function portion 103 is formed as a portion without holes. Furthermore, the lid member 82 has an outer circumferential surface 104 and an inner circumferential surface 106. In this embodiment, the number of water passage holes 102 is 8. Therefore, the number of lid function portions 103 is the same as the number of water passage holes 102. The water passage holes 102 are arranged along the circumferential direction. The plurality of water passage holes 102 are arranged at equal intervals in the circumferential direction. Multiple lid functional parts 103 are also arranged at equal intervals in the circumferential direction.

[0046] The lid member 82 further has projections 110. Multiple projections 110 are provided. Each of the lid function parts 103 has a projection 110. The projections 110 are provided on the lower surface of the lid function part 103. The projections 110 protrude downward from the lower surface of the lid function part 103. As shown in Figure 9(d), each projection 110 has a tapered shape. Each projection 110 decreases in diameter as it approaches its tip. The projections 110 protrude downward. The number of projections 110 is the same as the number of lid function parts 103. Multiple projections 110 are arranged at equal intervals in the circumferential direction.

[0047] Figure 10(a) is a perspective view of the annular body 84, Figure 10(b) is a plan view of the annular body 84, Figure 10(c) is a bottom view of the annular body 84, and Figure 10(d) is a side view of the annular body 84. The annular body 84 is composed of an annular member 80 and a lid member 82. As shown in Figure 10(d), in the annular body 84, the lid member 82 is positioned above the annular member 80. In the annular body 84, the phase of the swirling channel section 90 of the annular member 80 and the lid function section 103 of the lid member 82 are aligned. Each lid function section 103 closes each swirling channel section 90 from above. The resin surface constituting the lower surface of each lid function section 103 and the resin surface constituting the upper end surface of each swirling channel section 90 are in contact. The contact between the resin surfaces creates a seal between the lid function section 103 and the swirling channel section 90. The contact between these resin surfaces prevents the swirling flow FL1 inside the swirling hole 130 from leaking out of the upper opening of the swirling hole 130. The swirling hole 130 will be described later. Each projection 110 is inserted into each swirling flow channel section 90 (see Figure 10(c)). The swirling flow forming section 116 is formed by the combination of the swirling flow channel section 90 and the lid function section 103. The number of swirling flow forming sections 116 is the same as the number of swirling flow channel sections 90 and lid function sections 103. The number of swirling flow forming sections 116 is the same as the number of swirling holes 130. Multiple swirling flow forming sections 116 are arranged at equal intervals in the circumferential direction. The annular body 84 constitutes the ultrafine bubble generating section UF1. The annular body 84 is formed by multiple swirling flow forming sections 116 connected in the circumferential direction.

[0048] The annular body 84 has dimensions that can be fitted to the discharge section of an existing faucet device. The outer diameter (maximum diameter) of the annular body 84 may be between 20 mm and 37 mm. The inner diameter (minimum diameter) of the annular body 84 may be between 17 mm and 29 mm. The thickness (axial height) of the annular body 84 may be between 6 mm and 9 mm. Of course, the dimensions of the annular body 84 are not limited.

[0049] The swirling flow forming section 116 has an inlet 117 and an outlet 119. Water flows into the swirling flow forming section 116 from the inlet 117 and out from the outlet 119. In this embodiment, the inlet 117 is a water passage hole 102. The outlet 119 is the lower opening 131 of the swirling hole 130. Ultrafine bubbles are generated as the water passes through the swirling flow forming section 116.

[0050] In the annular body 84, the connection portion 92 of the annular member 80 and the water passage hole 102 of the lid member 82 are in phase (see Figure 10(b)). As will be described later, the water passage hole 102 promotes the inflow of water into each swirling flow forming portion 116.

[0051] The annular body 84 has an outer circumferential surface 118 and an inner circumferential surface 120. The outer circumferential surface 118 is composed of the outer circumferential surface 94 of the annular member 80 and the outer circumferential surface 104 of the lid member 82. The inner circumferential surface 120 is composed of the inner circumferential surface 96 of the annular member 80 and the inner circumferential surface 106 of the lid member 82.

[0052] The annular body 84 has an upper surface 122 and a lower surface 124. The upper surface 122 is the upper surface of the lid member 82 (lid function part 103). A water passage hole 102 is formed in the upper surface 122. The lower surface 124 is the lower surface of the annular member 80 (connecting part 92). A lower opening 131 of the swivel hole 130 is formed in the lower surface 124.

[0053] The annular member 80 and the lid member 82 are positioned circumferentially by interlocking protrusions and recesses. As shown in Figures 8(a) and 8(d), the annular member 80 has engaging projections 133. The engaging projections 133 are provided at multiple locations (2 locations) in the circumferential direction. As shown in Figure 8(d), the engaging projections 133 protrude upward. As shown in Figures 9(b) and 9(c), the lid member 82 has engaging recesses 135. The engaging recesses 135 are provided at multiple locations (2 locations) in the circumferential direction. In the annular body 84, each of the engaging projections 133 is inserted into each of the engaging recesses 135.

[0054] The lid member 82 is attached to the annular member 80 solely by the aforementioned interlocking grooves. There is no sealing member between the annular member 80 and the lid member 82. As described above, a sealing state is formed between the annular member 80 and the lid member 82 by the contact of the resin surfaces. Separation of the annular member 80 and the lid member 82 is easy. A user who has removed the annular body 84 can separate the annular member 80 and the lid member 82. This separation allows the user to clean the annular body 84, for example.

[0055] The lid member 82 has an upper projection 137. The upper projection 137 protrudes upward from the upper surface of the base 100. The upper projection 137 is provided at multiple locations (2 locations) in the circumferential direction. In the annular body 84, the upper projection 137 protrudes upward. The lid member 82 has a lower projection 139. The lower projection 139 protrudes downward from the lower surface of the base 100. The lower projection 139 is provided at multiple locations (2 locations) in the circumferential direction. In the annular body 84, the lower projection 139 is housed inside the annular body 84. The lower projection 139 is housed between adjacent swirling flow channel sections 90.

[0056] The annular body 84 has a structure to prevent misassembly. Misassembly means assembling the parts in the wrong state. Figures 10(a) to (d) show the annular body 84 in the correct state. There are several possible incorrect assembly patterns that deviate from the normal state. These include: (1) when only the annular member 80 is assembled upside down; (2) when only the lid member 82 is assembled upside down; (3) when both the annular member 80 and the lid member 82 are assembled upside down; and (4) when both the annular member 80 and the lid member 82 are oriented correctly, but there is a phase difference between them. In case (1), the lower protrusion 139 of the lid member 82 abuts against the connection portion 92 of the upside-down annular member 80, increasing the vertical dimension of the annular body 84 compared to the normal state. As a result, the annular body 84 cannot be accommodated in the discharge portion 50 (inside the screen member 56), and the incorrect assembly is detected. In case (2), the upper protrusion 137 that protrudes downward on the upside-down lid member 82 abuts against the swirling flow path portion 90 or connection portion 92 of the annular member 80, increasing the vertical dimension of the annular body 84. As a result, the annular body 84 cannot be accommodated in the discharge section 50 (inside the screen member 56), and misassembly is detected. In case (3), the upper projection 137 that protrudes downward on the inverted lid member 82 abuts against the connection section 92 of the inverted annular member 80, increasing the vertical dimension of the annular body 84. As a result, the annular body 84 cannot be accommodated in the discharge section 50 (inside the screen member 56), and misassembly is detected. In case (4), the projection 110 of the lid member 82 abuts against the connection section 92 of the annular member 80, or the engaging projection 133 of the annular member 80 abuts against the base 100 of the lid member 82, or the lower projection 139 of the lid member 82 abuts against the swirling flow path section 90 of the annular member 80, increasing the vertical dimension of the annular body 84. As a result, the annular body 84 cannot be accommodated in the discharge section 50 (inside the screen member 56), and misassembly is detected. Thus, the annular body 84 has a structure in which the vertical dimension (maximum dimension in the vertical direction) increases if the annular member 80 and / or the lid member 82 are assembled incorrectly. This structure prevents incorrect assembly.

[0057] The annular body 84 constitutes a single, unified component. The annular body 84 is interchangeably mounted. The annular body 84 is positioned in the discharge section 50, resting on the screen member 56 with a central cylindrical portion 60 inserted through its central cavity. The annular body 84 is not sealed between adjacent parts. Due to the presence of the central cylindrical portion 60, the annular body 84 hardly moves radially. Also, due to space constraints, the annular body 84 does not move vertically (axially). When the screen member 56 is removed, the annular body 84 is removed along with the screen member 56. The annular body 84 can be easily separated from the screen member 56. That is, if the removed screen member 56 is inverted, the annular body 84 will separate from the screen member 56 due to its own weight. Alternatively, the annular body 84 can be separated from the screen member 56 by pulling it in the direction that separates it from the screen member 56. In other words, the annular body 84 can be separated from the screen member 56 by pulling it out of the central cylindrical portion 60 into which it is fitted. The screen member 56 is detachably attached to the discharge portion 50. Therefore, the screen member 56 is detachable and replaceable. When the screen member 56 is removed, the annular body 84 is also removed along with the screen member 56. The user can remove the annular body 84. The user can replace the annular body 84. An old annular body 84 can be replaced with a new one, or with an annular body 84 with higher functionality. By removing only the annular body 84, the faucet device 10 can be used as a normal faucet without the ultrafine bubble generating portion UF1.

[0058] As described above, the faucet device 10 can be used with the ultrafine bubble generating unit UF1 removed. Therefore, a faucet device 10 with the ultrafine bubble generating unit UF1 (annular body 84) removed can be sold as a standard specification faucet device. In this case, both faucet devices with an ultrafine bubble generating function and faucet devices without an ultrafine bubble generating function can be manufactured on the same production line.

[0059] As shown in Figure 6, the space in which the annular body 84 is installed is a space that extends upward and is continuous with the annular space of the confluence g1. The annular body 84 occupies a portion of the annular space formed above the annular first water outlet s1 (screen 62), and the remaining portion constitutes the confluence g1. Existing faucet devices that do not have an ultrafine bubble generation function include those that can switch between a straight water flow and a shower water flow. In this faucet device, the shower water flow is discharged from an annular screen. In this existing faucet device, an annular space exists inside the annular screen, but by expanding this annular space, the ultrafine bubble generation unit UF1 (annular body 84) can be installed. With the faucet device 10, the design changes from existing faucet devices can be minimized. In addition, parts can be standardized with existing faucet devices.

[0060] In this embodiment, the annular member 80 and the lid member 82 are separate components. However, the annular member 80 and the lid member 82 may be integrally molded.

[0061] Figure 11, like Figure 8(b), is a plan view of the annular member 80. Each of the swirling flow channels 90 (swirling flow forming sections 116) has a swirling hole 130 and an inlet passage 132. The cross-sectional shape of the swirling hole 130 is circular. The swirling hole 130 is located in the center of the swirling flow channel 90 (swirling flow forming sections 116). All of the swirling holes 130 have the same radial position. This radial direction is the radial direction of the annular member 80 (annular body 84). The swirling holes 130 penetrate the annular member 80 in the vertical direction. The upper opening of the swirling hole 130 is closed by the lid function section 103. The lower opening 131 of the swirling hole 130 is open to the confluence section g1 (described later).

[0062] The inflow passages 132 form a flow path into the swivel hole 130. Multiple inflow passages 132 are provided for each swivel hole 130. In a plan view of the swivel flow path section 90 (Figure 11), the multiple inflow passages 132 are arranged symmetrically. The center of this symmetry coincides with the center of the swivel hole 130. The multiple inflow passages 132 are arranged at equal intervals in the circumferential direction of the swivel hole 130. As shown in Figure 8(a), the swivel hole 130 is formed as a central hole in a cylindrical section that protrudes upward, and the inflow passages 132 are formed by cutting out a part of this cylindrical section. The number of inflow passages 132 per swivel hole 130 may be 1, 2, 3, 4, or 5 or more. The multiple inflow passages 132 can be arranged at equal intervals in the circumferential direction of the swivel hole 130. In this embodiment, the inlet passage 132 comprises a first inlet passage 132a and a second inlet passage 132b. The circumferential positions of the first inlet passage 132a and the second inlet passage 132b differ by 180°. All inlet passages 132 connected to a single swivel hole 130 generate water flow in the same rotational direction within the swivel hole 130.

[0063] In this embodiment, there are two inflow passages 132 per swirling hole 130. The number of inflow passages 132 is not limited. From the viewpoint of uniformity of water flowing into the swirling hole 130, it is preferable that there be two or more inflow passages 132. If the number of inflow passages 132 is excessive in a limited installation space, the flow path cross-sectional area of ​​one inflow passage 132 becomes insufficient, which may reduce the flow velocity flowing into the swirling hole 130. From this viewpoint, it is preferable that there be four or fewer inflow passages 132.

[0064] Each of the connection sections 92 has a bridge section 134. The bridge section 134 connects the first inlet passage 132a of one swirling flow section 90 (swirling flow forming section 116) to the second inlet passage 132b of another adjacent swirling flow section 90 (swirling flow forming section 116). The upper surface 134a of the bridge section 134 is flush with the bottom surface 144 of the inlet passage 132 (see Figure 12(a)).

[0065] Figure 12(a) is a partially enlarged view of Figure 11. Note that in Figure 12(a), lines other than the contour lines have been removed. In plan view (Figure 12(a)), the inflow passages 132 (first inflow passage 132a, second inflow passage 132b) are oriented tangentially to or close to the direction of the swivel hole 130. Each of the inflow passages 132 has a first side surface 140 and a second side surface 142. Furthermore, each of the inflow passages 132 has a bottom surface 144. The width of the inflow passages 132 narrows as they approach the swivel hole 130. The swivel hole 130 has a center line L1. That is, in plan view, the swivel hole 130 has a center point P1. The center line L1 is parallel to the vertical direction (axial direction). Figure 12(b) is a schematic diagram showing the first side surface 140, the second side surface 142 and the center point P1 in plan view. Circles C1 and C2 are circles centered at the central point P1. The radius of circle C1, to which the first side surface 140 is tangent, is greater than the radius of circle C2, to which the second side surface 142 is tangent. As the inlet passage 132 approaches the swivel hole 130, the second side surface 142 approaches the first side surface 140. The diameter of circle C1 is equal to the inner diameter of the swivel hole 130 at the point where the first side surface 140 reaches the inner surface of the swivel hole 130.

[0066] As shown in Figure 12(b), a tangent line V1 of circle C1 exists at the point of tangency CP1 between the first side surface 140 and circle C1. In this embodiment, in the plan view of Figure 12(a), the first side surface 140 is a straight line, and the tangent line V1 coincides with the first side surface 140. Note that the first side surface 140 may be curved, in which case the tangent line V1 does not coincide with the first side surface 140. A tangent line V2 of circle C2 exists at the point of tangency CP2 between the second side surface 142 and circle C2. In this embodiment, in the plan view of Figure 12(a), the second side surface 142 is a straight line, and the tangent line V2 coincides with the second side surface 142. Note that the second side surface 142 may be curved, in which case the tangent line V2 does not coincide with the second side surface 142.

[0067] In Figure 12(a), the dashed line represents the flow of water. In the swirling flow forming section 116, water that has passed through the water passage hole 102 flows along the bridge section 134 and into the inlet passage 132. The water flow that has flowed through the inlet passage 132 becomes a swirling flow within the swirling hole 130. Although the aforementioned projection 110 is not shown in Figure 12(a), the swirling is promoted by the projection 110 that protrudes into the swirling hole 130, as will be described later.

[0068] In Figure 12(b), the double arrow θ indicates the angle between tangents V1 and V2. From the viewpoint of balancing the flow rate and flow velocity of the water flowing into the swirling hole 130 within a limited space, the angle θ can be made large. From this viewpoint, the angle θ can be 8° or more, more than 10° or more, and more than 12° or more. From the viewpoint of flow rate, the angle θ can be 18° or less, more than 16° or less, and more than 14° or less. In the above embodiment, the angle θ is 13°.

[0069] As shown in Figure 12(a), in this embodiment, the direction of rotation of the swirling flow is clockwise when viewed from above. The direction of rotation of the swirling flow is the same in all of the multiple swirling flow forming sections 116 (see Figure 11).

[0070] Furthermore, the configuration of the swirling flow forming section 116 is not limited as long as a swirling flow is formed. For example, the swirling flow forming section 116 may be composed solely of the swirling flow channel section 90, which does not have a lid function section 103 or the like.

[0071] Figure 13, like Figure 6, is an enlarged cross-sectional view of the discharge section 50. A portion of the water flowing through the first channel f1 flows into the swirling flow forming section 116 of the ultrafine bubble generation section UF1. By passing through the swirling flow forming section 116, a swirling flow FL1 is generated. In Figure 13, the swirling flow FL1 is indicated by a dashed arrow. At the confluence section g1, the swirling flow FL1 is discharged downwards. The swirling flow FL1 becomes a spiral flow and is discharged into the confluence section g1 from the outlet (lower opening 131) of the swirling hole 130. On the other hand, another portion of the water flowing through the first channel f1 flows into the bypass channel b1. In Figure 13, the water flow (bypass flow) FL2 flowing through the bypass channel b1 is indicated by a thick solid arrow. The bypass channel b1 extends in the vertical direction. At the confluence section g1, the bypass flow FL2 is discharged downwards.

[0072] The swirling flow FL1 and the bypass flow FL2 flow into the confluence g1. The swirling flow FL1 and the bypass flow FL2 merge at the confluence g1. The swirling flow FL1 expands at the confluence g1 due to centrifugal force. At the confluence g1, the bypass flow FL2 collides with the swirling flow FL1.

[0073] Looking at the confluence g1 as a whole, it is an annular space, and the outlet b10 of the bypass channel b1 also extends in an annular shape. The bypass channel b1 is formed radially outward of the annular body 84 (ultrafine bubble generating section UF1). The lower end position of this bypass channel b1 is the outlet b10 of the bypass channel b1. Water flow is discharged from the swirling flow forming section 116 at multiple positions in the circumferential direction. The water flow that exits from the outlet 119 of the swirling flow forming section 116 spreads in all directions due to the centrifugal force of the swirling flow FL1. The water flow that exits from the outlet 119 of the swirling flow forming section 116 includes water flow directed toward the first wall surface 152 (described later). The water flow that exits from the outlet 119 of the swirling flow forming section 116 includes water flow directed toward the second wall surface 154 (described later). Radially outside these outlets 119 (lower opening 131 of the swirling hole 130), bypass flow FL2 is discharged in a cylindrical shape. This bypass flow FL2 collides with the water flow discharged from the outlet 119 of the swirling flow forming section 116 to the confluence section g1.

[0074] Substantially, no bypass flow FL2 is formed radially inward from the outlet of the swirling flow FL1. As shown in the enlarged view of Figure 13, the lower surface 124 of the annular body 84 (ultrafine bubble generating section UF1) is in contact with the opposing mating surface (stepped surface of the central cylindrical section 60) 150. This contact is between resin surfaces. The annular body 84 is pushed downward by the water pressure of the water flowing through the first channel f1. The pressure of the contact on the lower surface 124 is increased by this water pressure. A seal is formed by the contact between the resin surfaces. For this reason, no bypass channel b1 is formed radially inward from the annular body 84. The outlet b10 of the bypass channel b1 is provided only radially outward from the swirling hole 130.

[0075] As shown in the enlarged view of Figure 13, the wall surface defining the confluence g1 has a first wall surface 152 located away from the outlet 119 (lower opening 131) of the swirling flow forming section 116, and a second wall surface 154 located on the opposite side of the first wall surface 152 and closer to the outlet 119 (lower opening 131) of the swirling flow forming section 116 than the first wall surface 152. In this embodiment, the first wall surface 152 is located radially outward with respect to the center line L1 of the swirling hole 130, and the second wall surface 154 is located radially inward with respect to the center line L1 of the swirling hole 130. The first wall surface 152 and the second wall surface 154 face each other via the confluence g1.

[0076] The first wall surface 152 is located radially outward from the swirling hole 130. The first wall surface 152 is located radially outward from the center line L1 of the swirling hole 130. The first wall surface 152 defines the outer circumferential surface of the annular space which is the confluence g1. The second wall surface 154 is located radially inward from the center line L1 of the swirling hole 130. The second wall surface 154 defines the inner circumferential surface of the annular space which is the confluence g1. The first discharge section s1 (screen 62) defines the lower surface of the annular space which is the confluence g1. The outlet 119 (lower opening 131) of the swirling flow forming section 116 faces the confluence g1 from above.

[0077] In Figure 13, the double arrow Da indicates the distance between the center line L1 of the swirling hole 130 and the first wall surface 152. This distance Da is measured along the radial direction. In Figure 13, the double arrow Db indicates the distance between the center line L1 of the swirling hole 130 and the second wall surface 154. This distance Db is measured along the radial direction. Distance Db is smaller than distance Da. The second wall surface 154 is closer to the outlet 119 of the swirling flow forming section 116 than the first wall surface 152.

[0078] At the confluence g1, the water flow exiting the bypass channel b1 is discharged to a position between the outlet 119 (lower opening 131) of the swirling flow forming section 116 and the first wall surface 152. At the confluence g1, the water flow exiting the bypass channel b1 is discharged to a radial position between the outlet 119 (lower opening 131) of the swirling flow forming section 116 and the first wall surface 152. The water flow exiting the bypass channel b1 is discharged downwards.

[0079] Figure 14 is an enlarged cross-sectional view of the swirling flow forming section 116. As described above, in the swirling flow forming section 116, the projection 110 is inserted into the swirling hole 130. The projection 110 is inserted into the swirling hole 130 from the upper side (upstream side). The projection 110 is inserted with its tip facing downwards (downstream side).

[0080] The swirling hole 130 has an upper end portion 160 and a lower end portion 162. The upper end portion 160 has a cylindrical surface without a taper. The outlet of the inlet passage 132 (see Figure 12(a)) is formed at the upper end portion 160. A projection 110 is inserted into the upper end portion 160. Water that enters the swirling hole 130 from the inlet passage 132 strikes the projection 110. The water flow striking the projection 110, which has a circular cross-section, efficiently generates a swirling flow. The circular cross-section of the projection 110 makes the flow of the swirling flow smooth. Because the projection 110 has a tapered shape, the swirling flow efficiently becomes a spiral flow, which can improve the flow velocity within the swirling hole 130.

[0081] The lower end portion 162 has the aforementioned lower opening 131 as its lower end. The lower end portion 162 has an enlarged diameter portion 164 in which its inner diameter continuously increases as it approaches the lower opening 131. In the enlarged diameter portion 164, the rate of increase in the inner diameter continuously increases as it approaches the lower opening 131. The enlarged diameter portion 164 helps to effectively spread the water flow released from the lower opening 131 at the confluence g1.

[0082] The swivel hole 130 has a reduced diameter section 166 between its upper end 160 and lower end 162. In the reduced diameter section 166, the inner diameter decreases continuously as it moves downwards. The reduced diameter section 166 is adjacent to the upper end 160. The reduced diameter section 166 contributes to an increase in flow velocity.

[0083] The swirl hole 130 has a minimum diameter section 168 between the upper end 160 and the lower end 162. The minimum diameter section 168 is located between the reduced diameter section 166 and the lower end 162. The minimum diameter section 168 is adjacent to the reduced diameter section 166. The minimum diameter section 168 is adjacent to the lower end 162. At the minimum diameter section 168, the inner diameter of the swirl hole 130 is at its minimum. The minimum diameter section 168 constitutes a cylindrical surface without a taper. The minimum diameter section 168 contributes to an increase in flow velocity.

[0084] In the swirl hole 130, the above-mentioned parts are connected without any steps. The inner surface of the swirl hole 130 as a whole forms a continuous surface without any steps. This continuous surface contributes to an increase in flow velocity.

[0085] Figure 15(a) is a perspective view of the annular member 170 relating to the faucet device of the second embodiment, Figure 15(b) is a plan view of the annular member 170, Figure 15(c) is a bottom view of the annular member 170, and Figure 15(d) is a side view of the annular member 170. The annular member 170 has a bypass channel expansion portion 172. The bypass channel expansion portion 172 is a recess formed on the outer peripheral surface 94 of the annular member 170. The bypass channel expansion portions 172 are provided at multiple positions in the circumferential direction. The bypass channel expansion portions 172 are arranged at equal intervals in the circumferential direction. The bypass channel expansion portion 172 expands the bypass channel b1. Except for the presence or absence of the bypass channel expansion portion 172, the annular member 170 is the same as the annular member 80. The faucet device of the second embodiment is the same as the faucet device 10 of the first embodiment, except that the annular member 170 is used instead of the annular member 80.

[0086] Figure 16(a) is a perspective view of the annular member 180 relating to the faucet device of the third embodiment, Figure 16(b) is a plan view of the annular member 180, Figure 16(c) is a bottom view of the annular member 180, and Figure 16(d) is a side view of the annular member 180. The faucet device of the third embodiment is the same as the faucet device 10 of the first embodiment, except that the annular body 84 is replaced by the annular member 180.

[0087] The annular member 180 has an upper opening 182, a lower opening 184, an outer circumferential surface 186, an inner circumferential surface 188, and a sloped surface 190. Inside the annular member 180, a flow path is formed with the upper opening 182 as the inlet and the lower opening 184 as the outlet. The sloped surface 190 is formed by a vane 192. The sloped surface 190 is the upper surface of the vane 192. In the bottom view of Figure 16(c), the lower surface of the vane 192 is visible.

[0088] The inclined surface 190 (blade 192) is formed inside the annular member 180. The inclined surface 190 (blade 192) is inclined downwards as it moves toward one side in the circumferential direction (counterclockwise in Figure 16(b)). The inclined surface 190 (blade 192) forms an inclined flow channel inside the annular member 180.

[0089] Multiple inclined surfaces 190 (blades 192) are provided. The multiple inclined surfaces 190 (blades 192) are arranged at equal intervals in the circumferential direction. In this embodiment, eight inclined surfaces 190 (blades 192) are provided.

[0090] As shown in Figure 16(d), the annular member 180 is constructed by combining two members. The annular member 180 consists of an upper member 180a and a lower member 180b. The upper member 180a and the lower member 180b are completely identical. In the annular member 180, the upper member 180a and the lower member 180b are superimposed in the same phase. The upper member 180a has multiple blades 192a. The lower member 180b has multiple blades 192b. A single inclined flow path is formed by a blade 192a at a certain circumferential position and a blade 192b at a circumferential position adjacent to this blade 192a on one side in the circumferential direction. The combination of these blades 192a and 192b constitutes a blade 192 (inclined surface 190) that forms an inclined flow path that penetrates the annular member 180. Multiple (8) inclined surfaces 190 (vanes 192) that are inclined in the same direction with respect to the circumferential direction form multiple (8) inclined flow channels that are inclined in the same direction with respect to the circumferential direction. The water released from these inclined flow channels combines to form a swirling flow. A single swirling flow is formed by the annular member 180 as a whole.

[0091] In this way, the annular member 180 forms a swirling flow. The annular member 180 as a whole is a swirling flow forming section 116. Ultrafine bubbles are generated by this swirling flow. The annular member 180 is an ultrafine bubble generating section UF1.

[0092] The embodiments described above produce the following effects.

[0093] An ultrafine bubble generating unit UF1 and a bypass channel b1 are provided in the first flow path f1, which has a first discharge port h1 as its outlet. In addition, a confluence section g1 is provided inside (upstream side) of the first discharge section s1 where the water that has passed through the ultrafine bubble generating unit UF1 and the water that has passed through the bypass channel b1 merge. This ensures that the flow rate of water containing the generated ultrafine bubbles discharged from the first discharge section s1 can be secured.

[0094] The water discharge from the first discharge section s1 and the water discharge from the second discharge section s2 can be switched. Therefore, it is possible to selectively switch between water discharged from the first discharge section s1, which generates ultrafine bubbles, and water discharged from the second discharge section s2, which does not intentionally generate ultrafine bubbles. In addition, the water pattern of the discharged water can be made different for the first discharge section s1 and the second discharge section s2. The water discharged from the first discharge section s1 can be set to a water pattern suitable for water that has generated ultrafine bubbles. The water discharged from the second discharge section s2 can be set to a different water pattern. By selectively switching between water discharged from the first discharge section s1 and the second discharge section s2, the degree of freedom in water discharge can be increased.

[0095] The following four types of water discharge can be selectively switched between (a) and (d), offering excellent flexibility in water discharge. (a) Discharge of raw water containing ultrafine bubbles generated in the ultrafine bubble generation unit UF1 from the first discharge unit s1. (b) Discharge of purified water containing ultrafine bubbles generated in the ultrafine bubble generation unit UF1 from the first discharge unit s1. (c) Discharge from the second discharge section s2 of raw water that does not contain intentionally generated ultrafine bubbles. (d) Discharge from the second discharge section s2 of purified water that does not contain intentionally generated ultrafine bubbles.

[0096] The first water outlet h1 is a shower hole h10, and the water discharged from the first water outlet s1 is in a shower stream. The shower stream allows for a strong water flow to be discharged over a wide area. By incorporating the generated ultrafine bubbles into this shower stream, the cleaning power of the shower stream can be enhanced. The water discharged from the second water outlet s2 is in a straight stream. By not providing an ultrafine bubble generator UF1 in the second flow path f2, which exits from the second water outlet s2, the large flow rate required for the straight stream can be secured.

[0097] The ultrafine bubble generating unit UF1 has a swirling flow forming unit 116 that forms a swirling flow. The swirling flow causes cavitation and generates ultrafine bubbles, and by forming a swirling flow, ultrafine bubbles can be effectively generated. In the above embodiment, ultrafine bubbles are generated by cavitation from dissolved air in the water without drawing in air from the outside. Of course, the method of generating ultrafine bubbles in the ultrafine bubble generating unit UF1 is not limited.

[0098] The ultrafine bubble generating unit UF1 is an annular body 84. This annular body 84 can be suitably arranged in a faucet member whose first water discharge unit s1 is annular. Therefore, water with ultrafine bubbles generated can be discharged in an annular stream.

[0099] The ultrafine bubble generating section UF1 is an annular body 84, and this annular body 84 is provided within the first channel f1. By making the gap 78 between the annular body 84 and the adjacent surface 76 a bypass channel b1, the channel of the ultrafine bubble generating section UF1 and the bypass channel b1 can be easily formed within the first channel f1.

[0100] The ultrafine bubble generating unit UF1 has multiple swirling flow forming units 116. Furthermore, the annular body 84 constituting the ultrafine bubble generating unit UF1 is formed by multiple swirling flow forming units 116 connected in the circumferential direction. Therefore, while the ultrafine bubble generating unit UF1 is an annular body 84, ultrafine bubbles can be effectively generated by the multiple swirling flow forming units 116.

[0101] From the viewpoint of increasing the concentration of ultrafine bubbles, the number of swirling flow forming sections 116 is preferably 4 or more, more preferably 6 or more, and even more preferably 8 or more. However, excessively increasing the number of swirling flow forming sections 116 does not improve the ultrafine bubble concentration and increases manufacturing costs, including mold costs. From this viewpoint, the number of swirling flow forming sections 116 can be 16 or less, even 14 or less, and even 12 or less.

[0102] The ultrafine bubble generation unit UF1 is located downstream of the water purification function unit 32, which is equipped with activated carbon. The ultrafine bubbles generated in the ultrafine bubble generation unit UF1 do not reach the water purification function unit 32. Ultrafine bubbles can affect the adsorption of harmful substances by activated carbon. Ultrafine bubbles may detach harmful substances that have been adsorbed by activated carbon and cause them to leak out. Also, ultrafine bubbles may be adsorbed by activated carbon, potentially hindering the water purification functions of activated carbon, such as the adsorption of harmful substances and chlorine removal. Furthermore, harmful substances may be adsorbed on the surface of ultrafine bubbles, causing them to leak out without being adsorbed by activated carbon. By positioning the ultrafine bubble generation unit UF1 downstream of the water purification function unit 32, it is possible to prevent the ultrafine bubbles generated in the ultrafine bubble generation unit UF1 from affecting the water purification function of activated carbon.

[0103] The water discharged from the swirling flow forming section 116 to the confluence section g1 expands within the confluence section g1 due to the centrifugal force of the swirling flow FL1. This water flow creates a pressure (water pressure) imbalance within the confluence section g1. This water flow also spreads outward from the outlet 119 of the swirling flow forming section 116 and is therefore also called an outward expanding flow. The pressure becomes higher on the side farther from the outlet 119. When a pressure imbalance occurs within the confluence section g1, turbulence occurs in the water discharged from the first discharge section s1. In the above embodiment, the water pattern from the first discharge section s1 is a shower pattern, but this shower pattern becomes turbulent.

[0104] At the confluence section g1, water that has passed through the ultrafine bubble generation section UF1 and water that has passed through the bypass channel b1 merge. The outward expanding flow from the outlet 119 of the swirling flow forming section 116 collides with the water flow coming out of the bypass channel b1. As a result, the pressure imbalance within the confluence section g1 caused by the outward expanding flow is mitigated. Consequently, turbulence in the water discharged from the first discharge section s1 is suppressed. In the above embodiment, the shower water pattern from the first discharge section s1 is stabilized.

[0105] At the confluence g1, the water that has passed through the ultrafine bubble generation section UF1 and the water that has passed through the bypass channel b1 are mixed well. As a result, the water discharged from the first discharge section s1 maintains a consistent flow rate while suppressing variations in ultrafine bubble concentration.

[0106] The wall defining the confluence g1 has a first wall 152 that is far from the outlet 119 of the swirling flow forming section 116, and a second wall 154 that is located on the opposite side of the first wall 152 and is closer to the outlet 119 of the swirling flow forming section 116 than the first wall 152 (see Figure 13). The second wall 154 is located on the opposite side of the outlet 119 of the swirling flow forming section 116 from the first wall 152. Because the distance from the outlet 119 differs between the first wall 152 and the second wall 154, pressure imbalances within the confluence g1 are more likely to occur. The pressure becomes higher on the side of the first wall 152, which is further from the outlet 119.

[0107] In the above embodiment, at the confluence g1, the water flow from the bypass channel b1 is discharged to a position between the outlet 119 of the swirling flow forming section 116 and the first wall surface 152 (see enlarged view in Figure 13). The radial position of the outlet b10 of the bypass channel b1 is outside the outlet 119 of the swirling flow forming section 116 and inside the first wall surface 152. The water flow from the bypass channel b1 obstructs the water flow (outward expanding flow) from the outlet 119 of the swirling flow forming section 116 from flowing toward the first wall surface 152. The water flow from the bypass channel b1 suppresses the uneven distribution of high pressure on the first wall surface 152 side. As a result, pressure imbalance within the confluence g1 is suppressed, and water discharge from the first discharge section s1 is stabilized.

[0108] When the first discharge hole h1 of the first discharge section s1 has multiple shower holes h10, the pressure imbalance within the confluence section g1 manifests as differences in water pressure from each shower hole. Therefore, the pressure imbalance within the confluence section g1 tends to manifest as turbulence in the water pattern. Furthermore, the outside of the shower pattern forms the contour shape of the shower pattern, and this turbulence is noticeable. Suppressing the pressure imbalance within the confluence section g1 and stabilizing the water pattern is effective for the shower pattern.

[0109] The swirling flow FL1 can produce abnormal noise. The sound produced by the swirling flow FL1 is known as a vortex whistle. It has been found that this abnormal noise can be reduced by providing a bypass channel b1. It is thought that the water flow from the bypass channel b1 weakens the outward expanding flow from the outlet 119 of the swirling flow forming section 116, and this reduces the abnormal noise.

[0110] The diameter of the first water discharge hole h1 (shower hole h10) provided in the screen 62 is small. This shower hole h10 has a conical shape that continuously decreases in diameter from the inlet side to the outlet side. The diameter (minimum value) of the shower hole h10 is preferably 0.2 mm or more and 0.4 mm or less, more preferably 0.25 mm or more and 0.35 mm or less. The small diameter of the shower hole h10 increases the water pressure of the discharged water, improving cleaning power and also enhancing water saving performance. With a small diameter shower hole h10, the water discharge is easily affected by the pressure inside the screen 62. By suppressing pressure imbalance at the confluence g1 inside the screen 62 having the small diameter shower hole h10, the shower water pattern is effectively stabilized.

[0111] The material of the screen 62 equipped with shower holes h10 can be resin or metal. Etching can be used as a method for forming small holes. From the viewpoint of using etching, metal is preferred as the material of the screen 62. Also, from the viewpoint of forming small holes by etching, the thickness of the screen 62 is preferably 0.4 mm or less, and more preferably 0.35 mm or less. From the viewpoint of strength, the thickness of the screen 62 can be 0.15 mm or more, more preferably 0.2 mm or more, and more preferably 0.25 mm or more. In the above embodiment, the thickness of the screen 62 was 0.3 mm.

[0112] From the perspective of increasing the amount of ultrafine bubbles generated, the total opening area of ​​the bypass channel b1 is 10 mm². 2 Below, and even 8mm 2 The following may also be the case: From the viewpoint of the water discharge flow rate from the first discharge section s1, the total opening area of ​​the bypass channel b1 is 3 mm 2 Furthermore, 4mm 2 The above may also be used. In this embodiment, the total opening area of ​​the bypass channel b1 is 4 mm 2 8mm or more 2 The following was determined: The total opening area of ​​the bypass channel b1 can be defined as the minimum area (total area) of the bypass channel b1 in a cross section perpendicular to the axial direction. The total opening area of ​​the bypass channel b1 is smaller than the total opening area of ​​the first discharge port h1.

[0113] The material of the ultrafine bubble generating section UF1 (annular body 84) can be resin or metal. From the viewpoint of cost and moldability, resin is preferred. If the material is resin, a thermoplastic resin that is easy to mold is preferred. From the viewpoint of moldability and strength, polyoxymethylene (POM), polyphenylene sulfide (PPS), and acrylonitrile butadiene styrene copolymer (ABS) are preferred. From the viewpoint of heat resistance, polyoxymethylene (POM) or polyphenylene sulfide (PPS) is more preferred. Considering sliding properties, polyoxymethylene (POM) is more preferred. [Examples]

[0114] [Example 1] An annular body identical to the annular body 84 (Figure 10) according to the first embodiment described above was created and designated as Example 1.

[0115] [Example 2] The outer diameter of the annular body was adjusted to set the gap width W1 to 0.00 mm according to the design value. Due to molding errors, a minute gap width W1 actually existed, forming a bypass channel. It is thought that a gap width W1 less than the measurement limit (0.05 mm) existed in the circumferential direction, albeit unevenly. Except for this point, the annular body of Example 2 was made the same as Example 1. In Table 1 below, "minute" is indicated in the column for gap width W1.

[0116] [Example 3] An annular body of Example 3 was obtained by making the same as Example 2 except for providing a bypass channel expansion section 172 (see Figure 15). The width W2 of the bypass channel expansion section was set to 0.5 mm. The radial depth of the bypass channel expansion section was set to 0.5 mm.

[0117] [Examples 4-8] Except for setting the width W2 of the bypass channel expansion section 172 (see Figure 15(b)) as shown in Table 1 below, the same configuration as in Example 3 was used to obtain the annular bodies of Examples 4 to 8.

[0118] [Comparative Example 1] The annular body of Comparative Example 1 was obtained in the same manner as in Example 1, except that an annular flange projecting radially outward was added to the outer surface of the annular body. The annular body was pressed into the installation location while crushing the flange. As a result, the gap width W1 became substantially zero, and no bypass flow path was formed.

[0119] [Comparative Example 2] The annular body of Comparative Example 2 was obtained by filling all the swirling holes 130, otherwise the same procedure as in Example 2. In Comparative Example 2, no swirling flow was generated, and therefore, the generation of ultrafine bubbles caused by the swirling flow did not occur.

[0120] An annular body was set in the faucet device 10 of the first embodiment, and water was discharged from the first discharge section s1 at a dynamic water pressure of 0.2 MPa to check the water flow rate, the occurrence of abnormal noise, and the water pattern. The evaluation results are shown in Table 1 below.

[0121] [Table 1]

[0122] The evaluation methods for abnormal noise and water patterns are as follows:

[0123] [Evaluation of abnormal noises] An engineer who has been involved in the development of faucet devices and has evaluated abnormal noises from faucets evaluated the sound during water discharge. In a laboratory with no other sounds, the engineer stood directly facing the discharge part 50, positioning both ears vertically to the same position as the discharge part 50, and listened to the sound during water discharge. The distance from the discharge part 50 to both ears was set to 30 cm. If an abnormal noise (vortex whistle) was heard, it was marked as "×", and if it was not heard, it was marked as "○". The evaluation results are shown in the "Sound" column of Table 1 below.

[0124] [Evaluation of water patterns] The shower spray pattern obtained from the above water discharge was evaluated. The evaluation was based on four levels: "◎", "○", "△", and "×". "◎" was given when the radiation angle of the shower spray pattern was normal. "×" was given when the radiation angle of the shower spray pattern was wider than normal. In the "×" shower spray pattern, abnormal water discharge was observed from the shower holes located radially outside the first water discharge section s1 (screen 62). "○" was given when the radiation angle of the shower spray pattern was normal, but there was circumferential variation in the density of the shower spray pattern. "△" was given when the radiation angle of the shower spray pattern was slightly wider outward, though not as much as in "×", and there was no circumferential variation in the density of the shower. In the case of "◎", no circumferential variation in the density of the shower was observed. These evaluation results are shown in the "Water Pattern" column of Table 1 below. The water pattern k1 when the evaluation is "◎" or "○" is shown in Figure 17. Figure 18 shows the water shape k2 when the evaluation is "×".

[0125] As shown in Table 1, the provision of a bypass channel increased the water discharge flow rate and suppressed abnormal noise. The noise level in Example 2 was slightly lower than that in Comparative Example 1. Furthermore, it was confirmed that the presence of the bypass channel stabilized the water flow pattern.

[0126] [Pressure simulation] The pressure distribution at the confluence g1 was confirmed by simulation. A comparison was made between the case with a bypass channel, which has the same configuration as Example 1, and the case without a bypass channel, in which the gap width W1 of Example 1 was completely filled and the bypass channel was eliminated. The pressure distribution of the radial cross-section of the confluence g1 was calculated. The axial position of this radial cross-section was set to the position of the outlet 119 of the swirling flow forming section 116. As a calculation condition, the pressure at the inlet of the swirling flow forming section 116 was set so that the pressure at the outlet 119 of the swirling flow forming section 116 was equivalent. In the case with a bypass channel, the pressure at this inlet was set to 0.3 MPa. In the case without a bypass channel, the pressure at this inlet was set to 0.4 MPa. The simulation was performed using Siemens' CFD software, "Simcenter STAR-CCM+". Images of the calculation results obtained from this simulation are shown in Figures 19(a) and 19(b). Figure 19(a) shows the simulation results in the case with a bypass channel. Figure 19(b) shows the simulation results for the case without a bypass channel. In Figures 19(a) and 19(b), pressures from 0.15 MPa to 0.25 MPa are shown in a 10-step gradient, with darker colors indicating higher pressures.

[0127] Figure 19(a), showing the case with a bypass channel, exhibited less pressure imbalance compared to Figure 19(b), showing the case without a bypass channel. In the case without a bypass channel, a region of high pressure was observed on the radially outer side. This result is consistent with the results of water flow turbulence.

[0128] [Comparison between Example 1 and Example 9 (Third Embodiment)] An annular body identical to the annular member 180 (Figure 10) of the third embodiment described above was created and designated as Example 9. With the gap width W1 the same, the particle number concentration of ultrafine bubbles was compared between Example 1 and Example 9. The particle number concentration of ultrafine bubbles generated due to the swirling flow formation section was evaluated by subtracting the particle number concentration of blank water (reference water). The measurement method and measurement conditions for the particle number concentration were as described above. As a result, the particle number concentration of Example 1, after subtracting the particle number concentration of blank water, was 152% (approximately 1.5 times) of the particle number concentration of Example 9.

[0129] The following notes are part of the inventions included in this disclosure. [Note 1] A first discharge section equipped with a first discharge hole which is the outlet of the first flow path, A second discharge section equipped with a second discharge hole which is the outlet of the second flow path, An outlet switching unit that switches between water discharged from the first water discharge unit and water discharged from the second water discharge unit, An ultrafine bubble generating unit is provided within the first channel for generating ultrafine bubbles, Within the first channel, a bypass channel is provided separately from the ultrafine bubble generation section, A confluence section is provided inside the first water discharge section, where the water that has passed through the ultrafine bubble generation section and the water that has passed through the bypass channel merge, A water discharge component having the following features. [Note 2] The ultrafine bubble generating unit is an annular body installed in the first channel, The water discharge member according to Appendix 1, wherein the bypass channel is the gap between the annular body and the adjacent surface. [Note 3] The first water discharge section is an annular screen formed around the second water discharge section, The aforementioned confluence is an annular space formed along the inside of the screen, The ultrafine bubble generating section is an annular body that extends in an annular shape along the confluence section, The water discharge member according to Appendix 2, wherein the bypass channel is formed on the radially outer side of the annular body. [Note 4] The water discharge member according to Appendix 3, wherein the first water discharge hole is a plurality of shower holes provided in the screen. [Note 5] The ultrafine bubble generating unit has a swirling flow forming unit that forms a swirling flow, The water discharge member according to any one of the appendices 1 to 4, wherein, in the confluence section, the water flow coming out of the swirling flow forming section collides with the water flow coming out of the bypass channel. [Note 6] The ultrafine bubble generating unit has a swirling flow forming unit that forms a swirling flow, The wall defining the confluence portion has a first wall surface located away from the outlet of the swirling flow forming portion, and a second wall surface located on the opposite side of the first wall surface and closer to the outlet of the swirling flow forming portion than the first wall surface. The water discharge member according to any one of the appendices 1 to 5, wherein, in the confluence section, the water flow from the bypass channel is discharged to a position between the outlet of the swirling flow forming section and the first wall surface. [Note 7] The ultrafine bubble generating unit has a plurality of swirling flow forming units, The water discharge member according to any one of the appendices 2 to 4, wherein the annular body is configured such that a plurality of the swirling flow forming portions are connected in the circumferential direction. [Note 8] It further has a water purification function unit equipped with activated carbon. The water discharge member according to any one of the appendices 1 to 7, wherein the ultrafine bubble generating unit is located downstream of the water purification function unit.

[0130] This application also discloses other inventions not included in the claims (including independent claims). Each form, component, configuration, and combination thereof described in the claims and embodiments of this application is recognized as an invention based on the effects and advantages it has.

[0131] Each of the forms, components, and configurations shown in the above embodiments can be individually applied to all inventions described in this application, including the invention claimed in this application, even if not all of the forms, components, or configurations of these embodiments are present. [Explanation of Symbols]

[0132] 10. Faucet device 12. Faucet body 14. Handle 16. Water outlet head (water outlet component) 24. Head section 26... Spout section 27...Water hole 28. Cartridge placement section 30...Water filter cartridges 32...Water purification function unit 50...Discharge part 52...Outlet switching section 54. Switching operation unit 56...Screen components 60...Central cylinder part 62... screens 78. Gap between the ultrafine bubble generating section (ring-shaped body) and the adjacent surface. 80... Ring-shaped member 82... Lid component 84.. Ring-shaped body 90... Swirling flow channel section 92...Connection part 94. Outer surface of the annular member 102...Water passage hole 103...Lid function part 110...protrusion 116...Swirling flow forming part 117... Inlet of the swirling flow formation section 119...Outlet of the swirling flow forming section 130...Swivel hole 131...Lower opening of the swivel hole 132...Inflow channel 152...First Wall 154...Second Wall 170... Ring-shaped member 172... Bypass channel expansion section 180... Ring-shaped member 190... slope 192 feathers f1...First channel f2...Second channel h1...1st water discharge hole h10... Shower holes h2...Second water discharge hole s1...First water outlet s2...Second water discharge section b1... Bypass channel g1... Confluence FL1...Swirling flow FL2... Bypass flow UF1...Ultrafine bubble generation unit

Claims

1. A first discharge section equipped with a first discharge hole which is the outlet of the first flow path, A second discharge section equipped with a second discharge hole which is the outlet of the second flow path, An outlet switching unit that switches between water discharged from the first water discharge unit and water discharged from the second water discharge unit, An ultrafine bubble generating unit is provided within the first channel for generating ultrafine bubbles, Within the first channel, a bypass channel is provided separately from the ultrafine bubble generation section, A confluence section is provided inside the first water discharge section, where the water that has passed through the ultrafine bubble generation section and the water that has passed through the bypass channel merge, A water discharge component having the following features.

2. The ultrafine bubble generating unit is an annular body installed in the first channel, The water discharge member according to claim 1, wherein the bypass channel is the gap between the annular body and the adjacent surface.

3. The first water discharge section is an annular screen formed around the second water discharge section, The aforementioned confluence is an annular space formed along the inside of the screen, The ultrafine bubble generating section is an annular body that extends in an annular shape along the confluence section, The water discharge member according to claim 2, wherein the bypass channel is formed on the radially outer side of the annular body.

4. The water discharge member according to claim 3, wherein the first water discharge hole is a plurality of shower holes provided in the screen.

5. The ultrafine bubble generating unit has a swirling flow forming unit that forms a swirling flow, The water discharge member according to any one of claims 1 to 4, wherein, in the confluence section, the water flow coming out of the swirling flow forming section collides with the water flow coming out of the bypass channel.

6. The ultrafine bubble generating unit has a swirling flow forming unit that forms a swirling flow, The wall defining the confluence portion has a first wall portion located away from the outlet of the swirling flow forming portion, and a second wall portion located on the opposite side of the first wall portion and closer to the outlet of the swirling flow forming portion than the first wall portion. The water discharge member according to any one of claims 1 to 4, wherein, in the confluence section, the water flow from the bypass channel is discharged to a position between the outlet of the swirling flow forming section and the first wall surface.

7. The ultrafine bubble generating unit has a plurality of swirling flow forming units, The water discharge member according to any one of claims 2 to 4, wherein the annular body is configured such that a plurality of the swirling flow forming portions are connected in the circumferential direction.

8. It further has a water purification function unit equipped with activated carbon. The water discharge member according to any one of claims 1 to 4, wherein the ultrafine bubble generating unit is located downstream of the water purification function unit.

Images