JP5532312B2 - Water discharge device - Google Patents

Description

  The present invention relates to a water discharge device capable of discharging air-bubble mixed water.

  Conventionally, as a water discharging device, in order to reduce the sound of water landing on the sink or sink bowl of the water discharge destination, or to suppress water splashing at that time, bubbles are mixed into the water discharge to discharge the bubble mixed water. Proposed. In particular, as described in Patent Document 1 below, a water discharge device has been proposed that increases the mixing rate of bubbles from a low flow rate stage with a low flow rate, in order to increase the amount of water discharge.

  The water discharge device described in the following Patent Document 1 includes a foam water discharge member provided with an air mixing mechanism and a rectifying mechanism in this order from the upstream side in a flow path extending between an inflow port and a discharge port. It is provided at the water outlet end of the faucet. The air mixing mechanism includes a pressure reducing plate, a flow path surrounding wall formed downstream of the pressure reducing plate, and a backflow prevention unit formed downstream of the flow path surrounding wall. The decompression plate is a circle concentric with the discharge port and has a plurality of small holes disposed on the circumference of a circle having a larger diameter than the discharge port, and is disposed so as to block the flow path. Yes. An air hole is formed in the flow path wall downstream of the decompression plate. A backflow prevention unit is disposed downstream of the region where the air holes are formed. The rectifying mechanism includes an inclined portion, a rectifying portion, a rectifying grid, and a rectifying path. The inclined portion has a flow path that has a diameter reduced to a funnel shape downstream of the backflow prevention portion. The rectifying unit has a flow path concentric with the discharge port extending from the downstream end of the inclined portion toward the discharge port. The rectifying grid is a grid-like portion disposed so as to block the rectifying unit of the flow path. The rectification path is a flow path connected to the rectification unit downstream of the rectification grid. Further, a throttle portion having a channel cross-section smaller than the channel cross-sectional area of the joint is provided upstream of the decompression plate.

  The water discharge device described in the following Patent Document 1 has the above-described configuration, so that when washing water passes through the small hole of the decompression plate, the pressure energy is converted into kinetic energy, and the jet from the small hole increases the flow velocity. The jet entrains the surrounding air due to viscosity. The water flow generated by entraining air in this way becomes a high-speed water flow containing relatively large bubbles and collides with a funnel-shaped inclined portion. The high-speed water flow that collides with the inclined portion becomes turbulent, breaks up relatively large bubbles contained therein, and is converted into a bubble-containing water flow containing fine bubbles. The bubble-mixed water stream converges along the inclined portion, is rectified by the rectifying grid, is collected by the rectifying path, and is discharged from the discharge port.

JP 2002-275969 A

  Since the water discharge device described in Patent Document 1 generates bubble-containing water by a so-called ejector effect, it effectively generates bubble-containing water containing fine bubbles at a low flow rate stage, and a sink or a wash surface from the discharge port. Can be discharged toward the bowl.

  By the way, when the bubble-mixed water is generated by the ejector effect, it is generated by the effect of entrainment of air by increasing the flow velocity of the jet flow from the small hole of the decompression plate. Therefore, if the amount of water increases and the flow rate increases, the amount of air mixed in as bubbles with respect to water tends to increase according to the increased flow rate. Therefore, even when the flow rate shifts to the high flow rate stage where the flow velocity is high, the bubble mixed water having a high bubble mixing rate is generated and discharged.

  In the low-flow stage, the water containing bubbles is basically increased by increasing the bubble mixing rate, thereby reducing the sound of water landing on the sink and sink bowl of the water discharge destination, and suppressing water splashing at that time. Without impairing the purpose, the amount of water discharged can be increased, and water can be saved. Therefore, the arrangement and shape of each member are devised in the direction of increasing the bubble mixing rate as much as possible in the low flow rate stage.

  However, in an actual use situation, not only such a low flow rate water supply but also a high flow rate water supply is required. For example, when water is stored in a cup or vase, there is a scene where it is necessary to increase the amount of water supplied in order to quickly fill the water. In the water discharge device described in Patent Document 1, since the mixing rate of bubbles increases when the flow rate is high, as a result, the increase in the total amount due to the increase in the mixing rate of bubbles has an effect rather than the increase in the amount of water intended by the user. However, a large flow rate of bubble-containing water exceeding the expected sensation is discharged. In particular, as described above, the more the device for increasing the bubble mixing rate at the low flow rate stage is, the more noticeable these events appear at the high flow rate stage.

  If you are washing dishes or washing your hands, if there is a sense of volume and the cleaning power does not change, it is preferable to use low-flow water discharge from the viewpoint of practical use and water saving. One should also use this low flow rate water discharge. However, when water is stored in a glass or vase, the psychology of wanting to store water works quickly, so it is natural for the user to operate the water discharge device so that the flow rate is high.

  In this way, as a result of the user operating the water discharge device so that the flow rate becomes high according to the sensation, the total amount of bubbles (corresponding to the actual amount of water and the amount of bubbles) that the user feels greatly exceeds the intended amount of water When water is discharged, the volume of water discharged will surely increase, but even if you try to collect water in a cup or vase, it will overflow with a folded flow due to the strong momentum of the water, and only about half the capacity of the cup will be stored. Things can't happen. Furthermore, even if you intend to store about half of the water in a glass or vase, you will actually pour the mixed water that is increased by the amount of bubbles, so even if you recognize that the user has collected about half of the water. It can happen that less water is actually collected. In addition to the situation where water is stored in a cup or vase, there is a risk that the basic purpose of reducing the sound of water landing on the sink or wash bowl at the water discharge destination or suppressing water splashing at that time may be impaired. is there.

  In order to avoid these problems, if the user has to finely adjust the amount of discharged water, the operation is complicated and requires a delicate sensation. is there. In addition, it is conceivable to manually adjust the opening of the air hole according to the increase in the amount of discharged water and to increase the bubble mixing rate in the case of a low flow rate, while suppressing the bubble mixing rate in the case of a high flow rate, This also imposes troublesome work on the user, and the usability is extremely poor in actual use.

  The present invention has been made in view of such a problem, and the purpose of the present invention is to incorporate air bubbles with an increased bubble mixing rate at a low flow rate stage even if the user adjusts the flow rate in the same manner as a conventional water discharge device. It is an object of the present invention to provide a water discharging device capable of discharging water and capable of preventing discharge of a total amount of bubble-containing water that feels that a user has greatly exceeded the amount of water intended by the user at a high flow rate stage. .

  In order to solve the above-described problem, a water discharge device according to the present invention is a water discharge device capable of discharging bubble-mixed water, and supplies a discharge port for discharging water and water discharged from the discharge port. An inflow port for inflow from the source, a main body part in which an internal flow path from the inflow port to the discharge port is formed, and water that has flowed in from the inflow port is jetted toward the downstream side of the internal flow path An orifice part and an opening part for introducing air into the internal flow path are formed, and the air introduced from the opening part is mixed into water jetted from the orifice part to form bubble mixed water, and the discharge port And a mixing rate adjusting unit that adjusts a mixing rate of bubbles mixed in the bubble mixing water in the bubble mixing unit. The mixing rate adjusting unit increases the mixing rate until the water flowing in from the inflow port reaches a predetermined flow rate, and suppresses the increase in the mixing rate when the water flowing in from the inflow port exceeds a predetermined flow rate.

  In the water discharge device according to the present invention, in the bubble mixing section, the air introduced from the opening is mixed into the water jetted from the orifice section to form the bubble mixed water and discharged from the discharge port. As a result, it is possible to easily generate water containing bubbles. The mixing rate adjustment unit increases the mixing rate of bubbles mixed in the bubble mixed water until the water flowing in from the inlet reaches a predetermined flow rate. Can be supplied. Therefore, it is possible to discharge water with a sense of volume even at a low flow rate stage, and it is possible to do dishwashing and hand washing with a small amount of water compared to water discharged without air bubbles, contributing to water saving and suppressing water splashing. You can also.

  When the water flowing in from the inflow port exceeds a predetermined flow rate, the mixing rate adjusting unit suppresses an increase in the mixing rate of bubbles mixed in the bubble mixed water. The rate can be maintained, or the bubble mixing rate can be reduced. Therefore, even if the setting is made to raise the bubble mixing rate to the limit at the low flow rate stage, the increase in the bubble mixing rate is suppressed with the increase in the flow rate from there, and the optimum in the region where the predetermined flow rate is exceeded. Mixing rate can be achieved. Therefore, as a result of the user's operation to increase the flow rate according to his / her sense, a total amount of bubble-containing water (corresponding to the actual amount of water and the amount of bubbles) that feels that the amount of water intended by the user has been greatly exceeded is discharged. Can be avoided.

  Specifically, when trying to store water in a cup or vase, it overflows with a return flow due to the strong momentum of the water (the total amount of water discharged is more than necessary), and only about half the capacity of the cup. You can avoid things that cannot be saved. Furthermore, when about half of the water is stored in the glass or vase, the increase in the amount of bubbles can be suppressed, so that the target amount of water can be stored. Further, since unnecessary bubbles can be subtracted from the total amount of water discharged at the high flow rate stage, the difference between the low flow rate stage and the high flow rate stage can be reduced in terms of the total amount of water discharge. Therefore, a large increase or decrease in the flow rate of the water discharge flow can be suppressed, and a large fluctuation in the water discharge momentum can also be suppressed, so that fluctuations in the water discharge trajectory such as when discharging water obliquely can be suppressed. Water discharge to the position becomes easy.

  As described above, according to the present invention, the user can adjust the amount of discharged water more finely or manually adjust the amount of air introduced, and the optimum air bubbles in both the low flow rate stage and the high flow rate stage. It is possible to enjoy water discharge with the mixing rate of. Therefore, even if the user adjusts the flow rate in the same way as a conventional water discharge device, it is possible to discharge the bubble mixed water with an increased bubble mixing rate at the low flow rate stage, and the user intends at the high flow rate stage. Therefore, it is possible to provide a water discharging device capable of preventing the total amount of bubble-mixed water that feels that the amount of water greatly exceeded has been discharged.

  Moreover, in the water discharging apparatus which concerns on this invention, the said mixing rate adjustment part suppresses the quantity of the said mixing rate by suppressing the quantity of the air introduce | transduced into the said bubble mixing part, when the water which flows in from the said inflow port exceeds predetermined flow volume. It is also preferable to suppress the increase.

  In this preferred embodiment, since the increase in the mixing rate is suppressed by suppressing the amount of air introduced into the bubble mixing unit, the mixing rate is reliably suppressed by suppressing the amount of air itself introduced into the bubble mixing unit. Can be suppressed.

  Further, in the water discharge device according to the present invention, the mixing rate adjusting unit is introduced by suppressing a force of drawing air from the opening to the bubble mixing unit when the water flowing in from the inflow port exceeds a predetermined flow rate. It is also preferable to suppress the amount of air.

  In this preferred embodiment, since the amount of air introduced into the bubble mixing portion is suppressed by suppressing the force that draws air from the opening to the bubble mixing portion, a separate pump such as a pump that can vary the force for forcibly feeding air. Since there is no need to provide this device, an increase in the mixing rate can be reliably suppressed with a simpler configuration.

  Further, the water discharge device according to the present invention includes a pressure reducing plate provided so as to block the internal flow path and formed with a plurality of holes constituting the orifice portion, and the bubble mixing portion is ejected from the plurality of holes. The negative pressure is generated by the generated water, and the air is drawn from the opening by the action of the negative pressure, and the mixing rate adjusting unit is configured so that the water flowing in from the inflow port exceeds a predetermined flow rate. It is also preferable to suppress the force of drawing air from the opening by suppressing an increase in the flow rate of water injected from the plurality of holes.

  In this preferred embodiment, the pressure reducing plate having a plurality of holes forming the orifice portion is provided so as to block the internal flow path, so that the water flowing in from the inlet can be surely passed through the plurality of holes. The bubble mixing part is configured to generate a negative pressure by water sprayed from a plurality of holes, and to draw air from the opening by the action of this negative pressure, so it is simple without providing a separate device for feeding air It is possible to generate bubble-containing water with a simple configuration. Further, when the water flowing in from the inlet exceeds a predetermined flow rate, the flow rate of the water to be injected is suppressed by suppressing the increase in the flow rate of the water injected from the plurality of holes, thereby suppressing the force to draw air from the opening. A single operation of suppressing the increase can also suppress the amount of air introduced incidentally.

  Moreover, in the water discharging apparatus which concerns on this invention, when the water which flows in from the said inflow port exceeds the predetermined flow volume, the said mixing rate adjustment part expands the opening area of these holes, and is sprayed from these holes. It is also preferable to suppress an increase in the flow rate.

  In this preferred embodiment, when the water flowing in from the inlet exceeds a predetermined flow rate, the increase in the flow velocity of the water ejected from the plurality of holes is suppressed by widening the opening area of the plurality of holes. With a simple configuration of increasing the area, it is possible to easily suppress an increase in the flow rate of water ejected from a plurality of holes.

  Moreover, in the water discharging apparatus which concerns on this invention, the said mixing rate adjustment part forms the path | route which water reaches downstream from the said pressure-reduction plate other than the said several hole, when the water which flows in from the said inflow port exceeds predetermined flow volume. It is also preferable to suppress an increase in the flow rate of water ejected from the plurality of holes.

  In this preferred embodiment, when the water flowing in from the inflow port exceeds a predetermined flow rate, a bypass route that does not relate to air drawing in the bubble mixing portion is not routed through the pressure reducing plate as a route that leads water downstream from the pressure reducing plate. Or a sub-path related to air drawing in the bubble mixing part is provided in the decompression plate. Therefore, if nothing is done, the water passing through the plurality of holes constituting the orifice portion is passed through a path other than the plurality of holes, thereby suppressing an increase in the amount of water passing through the plurality of holes and sprayed from the plurality of holes. An increase in the flow rate of water can be reliably suppressed.

  Moreover, in the water discharging apparatus which concerns on this invention, the said mixing rate adjustment part suppresses the mixing efficiency of the bubble with respect to the water in the said bubble mixing part, when the water which flows in from the said inflow port exceeds predetermined flow volume, The said mixing rate It is also preferable to suppress the increase of.

  In this preferable aspect, when the water flowing in from the inlet exceeds a predetermined flow rate, the increase in the mixing rate is suppressed by suppressing the bubble mixing efficiency with respect to the water in the bubble mixing portion. Since the mixing rate is adjusted only by adjusting the mixing efficiency, which is the ease of mixing water and air, without adjusting the supply amount, an increase in the mixing rate can be suppressed more easily.

  In the water discharge device according to the present invention, a gas-liquid interface is formed by temporarily storing water between the air outlet and the discharge port by the water jetted from the orifice portion in the bubble mixing portion, and the orifice The water jetted from the section rushes into the gas-liquid interface while entraining the air introduced from the opening, and generates bubble-mixed water. It is also preferable to suppress the mixing efficiency by suppressing an increase in the flow rate of water entering the gas-liquid interface when the water to be discharged exceeds a predetermined flow rate.

  In this preferred embodiment, the water jetted from the orifice part enters the gas-liquid interface while entraining the air, so that the air is entrained and the air is taken in by deformation of the gas-liquid interface. Water is produced. When the water flowing in from the inlet exceeds the specified flow rate, the increase in the flow rate of the water entering the gas-liquid interface is suppressed, so that the amount of entrained air is reduced and the deformation of the gas-liquid interface is suppressed, thereby suppressing the mixing efficiency. can do. Thus, mixing efficiency can be easily suppressed with a simple configuration of adjusting the flow velocity.

  In the water discharge device according to the present invention, a gas-liquid interface is formed by temporarily storing water between the air outlet and the discharge port by the water jetted from the orifice portion in the bubble mixing portion, and the orifice The water jetted from the section rushes into the gas-liquid interface while entraining the air introduced from the opening, and generates bubble-mixed water. When the amount of water exceeds a predetermined flow rate, it is also preferable to suppress the mixing efficiency by reducing the total length of contact between the outer periphery of the water flow entering the gas-liquid interface and the gas-liquid interface.

  In this preferred embodiment, the water jetted from the orifice part enters the gas-liquid interface while entraining the air, so that the air is entrained and the air is taken in by deformation of the gas-liquid interface. Water is produced. Therefore, using the fact that the amount of air taken in varies according to the outer peripheral length of the water flow entering the gas-liquid interface, if the water flowing in from the inlet exceeds a predetermined flow rate, the water flow entering the gas-liquid interface The mixing efficiency is suppressed by reducing the total length of contact between the outer periphery and the gas-liquid interface.

  According to the present invention, even if the user adjusts the flow rate in the same way as a conventional water discharge device, it is possible to discharge the bubble mixed water with an increased bubble mixing rate at the low flow rate stage, and at the high flow rate stage. It is possible to provide a water discharger capable of preventing the total amount of bubble-mixed water from being felt to greatly exceed the amount of water intended by the user.

It is a perspective view showing a faucet device which attached a spout cap which is a first embodiment of the present invention. It is a cross-sectional perspective view which shows the cross section in the centerline of the spout cap shown in FIG. It is sectional drawing for demonstrating the behavior of the spout cap shown in FIG. It is sectional drawing for demonstrating the behavior of the spout cap shown in FIG. It is a figure which shows the relationship between the amount of water and bubble mixing rate at the time of using the spout cap shown in FIGS. It is sectional drawing which shows the spout cap which concerns on the 1st modification of 1st embodiment of this invention. It is sectional drawing which shows the spout cap which concerns on the 1st modification of 1st embodiment of this invention. It is sectional drawing which shows the spout cap which concerns on the 2nd modification of 1st embodiment of this invention. It is sectional drawing which shows the spout cap which concerns on the 2nd modification of 1st embodiment of this invention. It is sectional drawing which shows the spout cap which concerns on 2nd embodiment of this invention. It is sectional drawing which shows the spout cap which concerns on 2nd embodiment of this invention. It is sectional drawing which shows the spout cap which concerns on the 1st modification of 2nd embodiment of this invention. It is sectional drawing which shows the spout cap which concerns on the 1st modification of 2nd embodiment of this invention. It is sectional drawing which shows the spout cap which concerns on the 2nd modification of 2nd embodiment of this invention. It is sectional drawing which shows the spout cap which concerns on the 2nd modification of 2nd embodiment of this invention. It is sectional drawing which shows the spout cap which concerns on the 3rd modification of 2nd embodiment of this invention. It is sectional drawing which shows the spout cap which concerns on the 3rd modification of 2nd embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In order to facilitate the understanding of the description, the same constituent elements in the drawings will be denoted by the same reference numerals as much as possible, and redundant description will be omitted.

  A water discharge cap (a water discharge device) according to a first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a perspective view showing a faucet device FC as a water discharge device. The faucet device FC is attached to a wash basin, a hand basin, a sink or the like, and is used to discharge water toward a bowl portion for storing water or receiving water. The faucet device FC is attached to the periphery of the bowl portion and connected to a water pipe that is a water supply source.

  The faucet device FC includes a standing portion B1, a spout portion B2, a water discharge handle HL, and a water discharge cap BC. The standing portion B1 is a portion that is fixed to the attachment surface, and is a portion that is attached and fixed in a state of being inclined perpendicularly or toward the near side from the attachment surface.

  The spout part B2 connected to the standing part B1 is a part that discharges water from the water outlet at the tip. The spout part B2 is provided in the vicinity of the upper end of the standing part B1 so as to protrude along the substantially horizontal direction.

  A faucet handle HL is provided at the upper end of the standing portion B1. By operating the faucet handle HL up and down, water discharge and water stop can be switched, and the water discharge amount can also be adjusted. It is also possible to change the temperature of the discharged water by operating the faucet handle HL left and right.

  Next, the spout cap BC attached to the spout of the spout B2 will be described with reference to FIG. FIG. 2 is a cross-sectional perspective view showing a cross section taken along the center line CL of the spout cap BC shown in FIG. In FIG. 2, the direction along the center line CL shown in FIG. 1 is the y-axis direction, and the horizontal direction perpendicular to the y-axis and along the paper surface is the x-axis direction.

  As shown in FIG. 2, the spout cap BC includes a first cylinder part 10 (main body part), a second cylinder part 20, a decompression part 30 (mixing rate adjustment part, air amount adjustment part), and an upper throttle. A diameter portion 40 (attenuation portion), a packing 50, a spring 60, a lower reduced diameter portion 70, and a rectifying portion 80 are provided.

  The first cylindrical portion 10 is a substantially cylindrical member, and a second cylindrical portion 20, a pressure reducing portion 30, an upper reduced diameter portion 40, a packing 50, and a spring 60 are provided inside the cylindrical shape. It functions as a main body part. A mounting screw portion 103 is provided on the upper end side (the negative end side in the y-axis direction) of the first cylindrical portion 10 in the figure. The attachment screw portion 103 is a female screw for attaching the spout cap BC to the spout of the spout portion B2. Below the mounting screw portion 103 (in the positive direction in the y-axis direction), the packing 50 is provided in an annular shape along the inner wall of the first tube portion 10. The packing 50 is a close contact member for preventing water leakage when the water outlet cap BC is attached to the water outlet of the spout part B2.

  When the mounting screw portion 103 of the first tube portion 10 is screwed and attached to the male screw of the spout port of the spout portion B2, the water Wa supplied from the faucet device FC is supplied from the inflow port 101. The water Wa that has entered the first tube portion 10 as the main body portion from the inflow port 101 has an internal flow path (details will be described later, but the second tube portion 20, the pressure reducing portion 30, the upper reduced diameter portion 40, the lower reduced diameter portion). Through the section 70 and the flow path passing through the rectifying section 80, the water is mixed with bubbles or rectified water (water substantially free of bubbles) and discharged from the discharge port 102 to the outside (bowl section). Water Wb.

  The upper reduced diameter portion 40 is disposed on the downstream side of the packing 50 (the discharge port 102 side, the positive direction in the y-axis direction). The upper narrowed portion 40 includes an annular collar 401 that forms an outer periphery in the shape of a hat collar, and an annular protrusion 402 that is surrounded by the collar 401 and formed in a region including the center. The flange 401 is closely fixed to the decompression unit 30, and as a result, the upper reduced diameter portion 40 and the decompression unit 30 are configured to move integrally.

  The annular convex portion 402 is formed so as to protrude upstream from the flange portion 401 (inlet 101 side, negative direction in the y-axis direction). An inflow hole 403 is formed in a region including the center of the annular protrusion 402. The water that has entered from the inflow port 101 hits the upper narrowed diameter portion 40, whereby the pressure fluctuation of the water is attenuated and flows out from the inflow hole 403 to the downstream side. The water flowing out from the inflow hole 403 to the downstream side flows into the water reservoir 404 formed between the upper throttle part 40 and the pressure reducing part 30.

  The decompression unit 30 is disposed on the downstream side of the upper reduced diameter portion 40. The decompression unit 30 includes a decompression plate 301 (pressure receiving plate), an upper protrusion 302, and a shielding wall 305 (mixing rate adjustment unit, air amount adjustment unit). The decompression plate 301 is a circular plate member. An upper protrusion 302 is provided near the outer periphery of the decompression plate 301.

  The upper protrusion 302 is formed so as to protrude to the upstream side over the entire outer periphery of the decompression plate 301. The flange 401 of the upper reduced diameter portion 40 is disposed so as to contact the upstream surface of the decompression plate 301, and is positioned by the upper protrusion 302. The annular convex portion 402 of the upper reduced diameter portion 40 is provided so as to be separated from the decompression plate 301. Accordingly, a space between the annular convex portion 402 and the decompression plate 301 is formed as a water storage portion 404.

  The decompression plate 301 has a plurality of injection holes 304 (orifice portions) formed in an annular shape. The plurality of injection holes 304 are formed at positions corresponding to the water reservoir 404. Accordingly, the plurality of injection holes 304 are provided so as not to be blocked by the flange portion 401 of the upper reduced diameter portion 40.

  A recess 303 is provided in a region including the center of the decompression plate 301. The recess 303 is formed on the upstream surface of the decompression plate 301. Accordingly, the water flowing out from the inflow hole 403 of the upper narrowed diameter portion 40 to the downstream side is concentrated and centered by the concave portion 303, and acts to push down the decompression plate 301 along the y-axis direction. The water that has flowed downstream from the inflow hole 403 of the upper narrowed diameter portion 40 spreads in the outer circumferential direction and is jetted downstream from the plurality of jet holes 304.

  A shielding wall 305 is provided on the downstream surface of the decompression plate 301. The shielding wall 305 is provided in the vicinity of the outer periphery of the decompression plate 301 so as to protrude over the entire outer periphery. The shielding wall 305 acts to close or open an air hole 204 (opening), which will be described later, as the decompression unit 30 moves up and down (advancing and retreating along the y-axis direction). If attention is paid to this action, the decompression unit 30, particularly the shielding wall 305, functions as an air amount adjusting unit that adjusts the amount of air introduced into the internal flow path, and the mixing rate for adjusting the mixing rate of bubbles into the bubble mixed water. Functions as an adjustment unit.

  A second cylinder portion 20 is provided between the upper reduced diameter portion 40 and the decompression portion 30 and the first cylinder portion 10. The second cylinder part 20 includes an upstream first guide part 201 and a downstream second guide part 205.

  An outer protrusion 202 is provided at the upper end of the first guide portion 201 (the end portion on the inflow port 101 side, the end portion in the negative direction in the y-axis direction) so as to protrude toward the first tube portion 10 side. . The outer protrusion 202 is engaged with the engagement protrusion 104 provided on the inner side of the first cylinder part 10, whereby the second cylinder part 20 is positioned and held at a predetermined position with respect to the first cylinder part 10. It is formed as follows.

  An inner periphery of the first guide portion 201 is disposed so that the outer periphery of the decompression plate 301 contacts. The decompression plate 301 of the decompression unit 30 is configured to move in the vertical direction (the direction along the y-axis) along the inner wall surface of the first guide unit 201.

  An inner protrusion 203 is provided at the lower end of the first guide portion 201 (the end on the discharge port 102 side, the end in the positive direction in the y-axis direction) so as to protrude toward the internal flow path. The inner protrusion 203 is disposed so that the outer surface of the shielding wall 305 of the decompression unit 30 contacts. The shielding wall 305 is configured to move in the vertical direction (direction along the y-axis) while contacting the inner protrusion 203.

  Between the 1st guide part 201 and the 2nd guide part 205, the air hole 204 (opening part) which introduces air in an internal flow path is provided. The air holes 204 are provided so as to be scattered over the entire circumference of the second cylindrical portion 20 between the first guide portion 201 and the second guide portion 205. Since the air hole 204 is formed immediately below the inner protrusion 203 of the first guide portion 201, the air hole 204 is configured to be closed or opened by the movement of the shielding wall 305 described above.

  A space is provided between the first cylinder portion 10 and the second cylinder portion 20, and is formed as an air flow path 802. A space between the downstream end of the first cylindrical portion 10 and the downstream end of the second cylindrical portion 20 is open, and is formed as an air inlet 803. Air introduced from the air inlet 803 is introduced from the air hole 204 to the internal flow path through the air flow path 802.

  A lower reduced diameter portion 70 is disposed inside the second guide portion 205. The lower reduced diameter portion 70 is a cylindrical member provided with a reduced diameter tapered portion 701 and an enlarged diameter tapered portion 702. The reduced diameter taper portion 701 is provided on the upstream side of the enlarged diameter taper portion 702, and is formed so as to narrow the internal flow path from the upstream side toward the downstream side. The enlarged diameter taper portion 702 is provided on the downstream side of the reduced diameter taper portion 701, and is formed so as to widen the internal flow path from the upstream side toward the downstream side.

  An inclined surface 701 a that is an inner side surface of the reduced diameter tapered portion 701 is formed at a position corresponding to the plurality of injection holes 304 of the decompression portion 30. Therefore, the water sprayed from the plurality of spray holes 304 of the decompression plate 301 strikes the inclined surface 701a and is directed inward.

  When water is supplied from the inflow port 101 and water is injected from the plurality of injection holes 304 of the decompression plate 301, the water accumulates from the downstream side, and a gas-liquid interface is formed at a position corresponding to the lower throttle portion 70. The Since the water flow directed by the inclined surface 701a enters the gas-liquid interface while entraining air, bubble-containing water is generated. Due to the action of the decompression plate 301, a negative pressure is generated between the decompression plate 301 and the lower diameter portion 70, so that air is drawn from the air holes 204 and enters the gas-liquid interface together with water ejected from the plurality of ejection holes 304. To do. Due to the rush of water flow to the gas-liquid interface, the gas-liquid interface is disturbed and air bubbles are more likely to be mixed. Therefore, a region from the decompression plate 301 to the lower reduced diameter portion 70 is formed as the bubble mixing portion 703.

  The bubble mixed water generated by the bubble mixing unit 703 is rectified by the rectifying grid 801 of the rectifying unit 80 provided on the downstream side of the second guide unit 205 and discharged from the discharge port 102 to the outside.

  A spring 60 as an urging means is disposed between the pressure reducing unit 30 and the lower diameter reducing unit 70. The spring 60 is arranged so as to be wound around the outside of the reduced diameter taper portion 701 of the lower diameter reducing portion 70 and is arranged so as to be wound inside the shielding wall 305 of the decompression portion 30.

  Therefore, when water is supplied from the inflow port 101 and hits the decompression plate 301 of the decompression unit 30 through the inflow hole 403 of the upper throttle portion 40, the decompression unit 30 has a force that is pushed down from the upstream side to the downstream side. receive. Since the spring 60 is arranged to oppose this force, the movement of the shielding wall 305 does not move until a predetermined flow rate of water is supplied from the inflow port 101 (or even if it moves, the air hole 204 is not moved). It can be adjusted so as to move and shield the air hole 204 when water exceeding a predetermined flow rate is supplied from the inlet 101.

  The movement of the shielding wall 305 will be described with reference to FIGS. 3 and 4. FIG. 3 is a cross-sectional view showing the spout cap BC until the water flowing from the inlet 101 reaches a predetermined flow rate. FIG. 4 is a cross-sectional view illustrating the spout cap BC when water flowing from the inflow port 101 exceeds a predetermined amount of water.

  As shown in FIG. 3, until the water flowing in from the inflow port 101 reaches a predetermined flow rate, the flowing water Wa pushes the pressure reducing plate 301 (pressure receiving plate) in the downstream direction (y-axis positive direction). However, since the force with which the spring 60 pushes the decompression plate 301 in the upstream direction (the negative y-axis direction) is superior, the decompression plate 301 is maintained without moving from the initial position. Therefore, the shielding wall 305 does not block the air hole 204, and air continues to be supplied into the bubble mixing portion 703 that has a negative pressure.

  Therefore, water injected from the plurality of injection holes 304 enters the gas-liquid interface formed in the bubble mixing unit 703 with air, disturbs the gas-liquid interface, and takes in air to generate bubble mixed water. . Therefore, the water Wb discharged from the discharge port 102 is bubble mixed water.

  On the other hand, as shown in FIG. 4, when the water flowing in from the inflow port 101 exceeds a predetermined flow rate, the flowing water Wa pushes the pressure reducing plate 301 (pressure receiving plate) in the downstream direction (y-axis positive direction). The force overcomes the force by which the spring 60 pushes the pressure reducing plate 301 in the upstream direction (negative y-axis direction), so that the pressure reducing plate 301 moves downward from the initial position. Therefore, the shielding wall 305 is gradually lowered, and the supply of air into the bubble mixing portion 703 is restricted. Eventually, as shown in FIG. 4, the air hole 204 is moved to a position to be blocked, and the supply of air into the bubble mixing unit 703 is stopped.

  Therefore, the water injected from the plurality of injection holes 304 enters the gas-liquid interface formed in the bubble mixing part 703 without accompanying air, so that the bubble mixed water is not generated. Therefore, the water Wb discharged from the discharge port 102 is rectified water in which bubbles are not mixed.

  Bubble mixing rate when the flow rate of the water Wa supplied to the inflow port 101 is increased using the water discharge cap BC described above, and bubble mixing rate when the water discharge port cap that does not move the decompression plate 301 is used. FIG. 5 shows a comparison of FIG. In FIG. 5, Example 1 uses a spout cap BC. In FIG. 5, the comparative example 1 uses what fixed the pressure reducing plate 301 of the spout cap BC so that it might not move. The bubble mixing rate in the present embodiment indicates the ratio of the sum of the volume of bubbles in the bubble-containing water to the volume of water in the bubble-containing water. Specifically, the bubble-containing water is separated into water and bubbles (air), and the respective volumes are measured and calculated.

  In Comparative Example 1, when the flow rate of the supplied water is increased, the bubble mixing rate is also increasing in proportion to the increment. On the other hand, in the first embodiment, the decompression plate 301 is configured not to move up to a predetermined flow rate (about 4.2 L / min). Therefore, when the flow rate of the supplied water is increased, the pressure is proportional to the increment. As a result, the mixing rate of bubbles is increasing. However, if the flow rate exceeds a predetermined flow rate (about 4.2 L / min), the pressure reducing plate 301 starts to move downstream, so that the bubble mixing rate is gradually suppressed. Since the air hole 204 is blocked by the shielding wall 305 when the flow rate is about 5 L / min, the mixing rate of bubbles is remarkably suppressed.

  As described above, the water discharge cap BC (water discharge device) of the present embodiment is a water discharge device capable of discharging bubble-mixed water, and includes a discharge port 102 for discharging water Wb and a discharge port 102. From the inlet 101 for allowing water Wa to be discharged from the water supply source, the first cylinder portion 10 (main body portion) in which the internal flow path from the inlet 101 to the outlet 102 is formed, and from the inlet 101 A plurality of injection holes 304 (orifice portions) for injecting the inflowing water toward the downstream side of the internal flow path, and air holes 204 (openings) for introducing air into the internal flow path are formed. The air introduced from the air is mixed into the water jetted from the plurality of injection holes 304 to form the bubble mixed water and is supplied to the discharge port 102, and the bubble mixed portion 703 is mixed with the bubble mixed water. Adjust the bubble mixing rate A shielding wall 305 (mixing ratio adjustment unit), and a. The shielding wall 305 functioning as a mixing rate adjusting unit increases the mixing rate until the water flowing from the inlet 101 reaches a predetermined flow rate, and increases the mixing rate when the water flowing from the inlet 101 exceeds the predetermined flow rate. It acts to suppress.

  In the spout cap BC as the water discharge device according to the present embodiment, the air introduced from the air holes 204 as the openings is mixed in the water injected from the plurality of injection holes 304 as the orifices in the bubble mixing portion 703. Then, since it is formed as bubble-mixed water and discharged from the discharge port 102, the bubble-mixed water can be easily generated using the ejector effect. The shielding wall 305 functioning as a mixing rate adjusting unit increases the mixing rate of bubbles mixed in the bubble mixed water until the water flowing in from the inlet 101 reaches a predetermined flow rate. It is possible to supply high-rate bubbling water. Therefore, it is possible to discharge water with a sense of volume even at a low flow rate stage, and it is possible to do dishwashing and hand washing with a small amount of water compared to water discharged without air bubbles, contributing to water saving and suppressing water splashing. You can also.

  The shielding wall 305 functioning as a mixing rate adjusting unit suppresses an increase in the mixing rate of bubbles mixed in the bubble mixed water when the water flowing from the inlet 101 exceeds a predetermined flow rate, and therefore flows in from the inlet 101. Depending on the amount of water, the mixing rate of bubbles can be maintained or the mixing rate of bubbles can be reduced. Therefore, even if the bubble mixing rate is set to the maximum at the low flow rate stage, the bubble mixing rate does not increase with the increase of the flow rate from there, and it is optimal in the region where the predetermined flow rate is exceeded. The mixing rate can be reduced (see FIG. 5). Therefore, as a result of the user's operation to increase the flow rate according to his / her sense, a total amount of bubble-containing water (corresponding to the actual amount of water and the amount of bubbles) that feels that the amount of water intended by the user has been greatly exceeded is discharged. Can be avoided.

  Specifically, when trying to store water in a cup or vase, it overflows with a return flow due to the strong momentum of the water (the total amount of water discharged is more than necessary), and only about half the capacity of the cup. You can avoid things that cannot be saved. Furthermore, when about half of the water is stored in the glass or vase, the increase in the amount of bubbles can be suppressed, so that the target amount of water can be stored. Further, since unnecessary bubbles can be subtracted from the total amount of water discharged at the high flow rate stage, the difference between the low flow rate stage and the high flow rate stage can be reduced in terms of the total amount of water discharge. Therefore, a large increase or decrease in the flow rate of the water discharge flow can be suppressed, and a large fluctuation in the water discharge momentum can also be suppressed, so that fluctuations in the water discharge trajectory such as when discharging water obliquely can be suppressed. Water discharge to the position becomes easy.

  As described above, when the spout cap BC according to the present embodiment is used, the user does not need to finely adjust the water discharge amount or manually adjust the air introduction amount, and even at a low flow rate stage, Even at the flow rate stage, water discharge with an optimum bubble mixing rate can be enjoyed. Therefore, even if the user adjusts the flow rate with the faucet device FC (water discharge device) to which the water outlet cap BC is attached in the same manner as a conventional water faucet device (water discharge device), the bubble mixing rate is reduced at the low flow rate stage. It is possible to discharge the increased bubble-containing water, and at the high flow rate stage, it is possible to prevent the discharge of the total amount of bubble-containing water that feels that the amount of water intended by the user is greatly exceeded.

  As described above, the decompression unit 30 including the shielding wall 305 of the present embodiment functions as a mixing rate adjusting unit that adjusts the mixing rate of bubbles in the bubble mixed water. More specifically, it functions to suppress an increase in the mixing rate by suppressing the flow of air. As described above, since the flow of air is suppressed by adjusting the ease of entering the air into the bubble mixing unit 703, the amount of water supplied to the bubble mixing unit 703 and the air conveyance force to the bubble mixing unit The increase in the mixing rate is suppressed with a simple configuration regardless of sophisticated means such as adjusting the level.

  In addition, the decompression unit 30 functioning as a mixing rate adjusting unit in the present embodiment suppresses the amount of air introduced into the bubble mixing unit 703 when the water flowing from the inlet 101 exceeds a predetermined flow rate, thereby reducing the mixing rate. It also suppresses the increase of. In this way, since the increase in the mixing rate is suppressed by suppressing the amount of air introduced into the bubble mixing unit 703, it is reliably mixed by suppressing the amount of air itself introduced into the bubble mixing unit 703. An increase in rate can be suppressed.

  In addition, the decompression unit 30 that functions as a mixing rate adjustment unit in the present embodiment increases the flow resistance in the air hole 204 that functions as an opening when the water flowing in from the inlet 101 exceeds a predetermined flow rate, thereby increasing the air flow resistance. It also suppresses the flow and suppresses the increase in the mixing rate. In this way, by increasing the flow resistance at the air hole 204 as an opening, the flow of air is suppressed with a simple configuration of increasing the pressure loss of the air passing through the air hole 204, thereby suppressing an increase in the mixing rate. Therefore, the bubble mixing rate can be adjusted with a simple configuration.

  As one of the techniques for increasing the pressure loss of air passing through the air holes 204, the decompression unit 30 functioning as a mixing rate adjusting unit suppresses the flow of air by narrowing the opening area with respect to the internal flow path of the air holes 204, The increase in the mixing rate is suppressed. In other words, the flow path resistance in the air hole 204 is increased by narrowing the opening area of the air hole 204 with respect to the internal flow path. As described above, since the pressure loss of the air passing through the air hole 204 is increased by increasing the flow path resistance in the air hole 204, the mixing ratio of bubbles can be adjusted with a simple configuration.

  Moreover, in this embodiment, the upper diameter reducing part 40 which functions as an attenuation | damping part which attenuates the pressure fluctuation of the water which flows in from the inflow port 101, and flows out into the downstream of an internal flow path is provided. The decompression unit 30 that functions as a mixing rate adjustment unit includes a decompression plate 301 that functions as a pressure receiving plate that receives water flowing out from the upper throttle portion 40 that functions as an attenuation unit in a region including the center thereof. It is configured to be able to advance and retreat along the internal flow path by the force applied from the water received by 301. When the amount of water received by the pressure reducing plate 301 functioning as a pressure receiving plate exceeds the threshold amount of water, the pressure reducing portion 30 (the shielding wall 305) moves so as to narrow the opening area of the air hole 204.

  Thus, the decompression unit 30 has the decompression plate 301 as a pressure receiving plate that receives the water flowing out from the upper reduced diameter portion 40 as the attenuation unit in a region including the center thereof, and the decompression plate 301 as the pressure receiving plate receives the pressure receiving plate 301. It is configured to be able to advance and retract along the internal flow path by the force acting from the water. Therefore, even if there is a fluctuation in the pressure of water entering from the inlet 101, it is received in the region including the center of the decompression plate 301, so that it can move stably along the internal flow path without tilting. When the amount of water received by the decompression plate 301 exceeds the threshold amount of water, the decompression unit 30 moves so as to narrow the opening area of the air hole 204, so the bubble mixing rate can be adjusted with a simple and stable configuration.

  Further, when the viewpoint is changed, the pressure reducing plate 301 functioning as a pressure receiving plate receives water flowing out from the upper reduced diameter portion 40 functioning as an attenuation portion, and the self acting force received by the pressure reducing plate 301 functioning as the pressure receiving plate. Therefore, it can be seen that the decompression unit 30 functioning as an air amount adjusting unit is configured to be movable back and forth along the internal flow path. If grasped in this way, an air hole that functions as an opening by advancing and retreating along the internal flow path (part of which is defined by the inner wall of the second cylindrical portion 20) of the decompression unit 30 (air amount adjustment unit). The opening area with respect to the internal flow path 204 is configured to change. The opening area is maintained until the water flowing from the inlet 101 reaches a predetermined flow rate, and the opening area is reduced when the water flowing from the inlet 101 exceeds the predetermined flow rate.

  In other words, the upper throttle part 40 that functions as an attenuation part that attenuates the pressure fluctuation of the water flowing in from the inlet 101 and flows out to the downstream side of the internal flow path is received, and the water that flows out from the upper throttle part 40 is received. The pressure reducing plate 301 functioning as a pressure receiving plate is provided, and the pressure reducing portion 30 (shielding wall 305) functioning as an air amount adjusting portion along the internal flow path can be moved forward and backward by force acting from water received by the pressure reducing plate 301. It is configured. Therefore, even if there is a fluctuation in the pressure of water entering from the inflow port 101, it is attenuated by the upper throttle part 40 that functions as an attenuation part and is received by the pressure reducing plate 301. ) Can move stably along the internal flow path without tilting.

  In this embodiment, the pressure reducing plate 301 functioning as a pressure receiving plate is configured to receive water that has flowed out from the upper reduced diameter portion 40 as an attenuation portion in a region including the center thereof. As described above, the pressure reducing plate 301 as the pressure receiving plate can be received in a region including the center even if there is a pressure fluctuation of water entering from the inflow port 101. Therefore, the behavior of the pressure reducing plate 301 as the pressure receiving plate is more stable, and the pressure reducing portion 30 (shielding wall 305) as the air amount adjusting portion can be stably moved along the internal flow path without being inclined. .

  A recessed portion 303 is formed in a region including the center of the pressure reducing plate 301 as a pressure receiving plate, and the recessed portion 303 is configured to receive water flowing out from the upper reduced diameter portion 40 as an attenuation portion. Thus, since the recessed part 303 is formed in the area | region including the center of the pressure-reduction plate 301 as a pressure receiving plate, the force of the water which hits the pressure-reduction plate 301 and goes to a horizontal direction can be concentrated in the recessed part 303, and can be made to go below. it can. Therefore, the behavior of the decompression unit 30 (shielding wall 305) as the air amount adjusting unit can be made to be more along the internal flow path, and the decompression unit 30 (shielding wall 305) can be stably stabilized without tilting. It can move along the internal flow path.

  Between the upper reduced diameter portion 40 as the attenuation portion and the pressure reducing plate 301 as the pressure receiving plate, a water storage portion 404 for temporarily storing water is provided. As described above, the water storage portion 404 for temporarily storing water is provided between the upper reduced diameter portion 40 as the attenuation portion and the pressure reducing plate 301 as the pressure receiving plate. The produced water exhibits a buffering action, and the wobbling of the pressure reducing plate 301 as the pressure receiving plate is made small, so that the movement along the internal flow path can be performed stably.

  In addition, the internal flow path in the present embodiment has a circular cross-sectional portion where the cross-section of the flow path is substantially circular at least at a portion where the air hole 204 is formed, and the decompression unit 30 as the air amount adjustment unit is a pressure receiving plate. The decompression plate 301 is formed so that the outer periphery of the decompression plate 301 is substantially circular along the circular cross section, and a plurality of air holes 204 as openings are provided so as to surround the internal flow path along the cross section of the flow path. Yes.

  As described above, in the present embodiment, the decompression unit 30 as the air amount adjustment unit moves stably, and the opening area with respect to the internal flow path of the air hole 204 as the opening can be changed stably. is there. Therefore, the outer periphery of the pressure reducing plate 301 as the pressure receiving plate is formed to be a disk shape along the circular cross-section portion of the internal flow path, and the air hole 204 as the opening portion extends along the flow path cross section of the internal flow path. Are provided so that the opening area corresponding to each air hole 204 arranged so as to surround the internal flow path can be adjusted to be constant, and the generation of bubble-containing water is more stable. Become.

  Subsequently, a spout cap BCa as a first modification of the spout cap BC according to the present embodiment will be described with reference to FIGS. 6 and 7. 6 and 7 are cross-sectional views of a spout cap BCa as a first modification. In the spout cap BC, the decompression unit 30 is provided with a shielding wall 305 that shields the air holes 204, and by moving the decompression unit 30, the opening area of the air holes 204 is changed to adjust the mixing rate. However, the mixing rate adjusting unit that changes the mixing rate of bubbles in the bubble mixing water is not limited to this, and it is also preferable to suppress an increase in mixing rate by suppressing the mixing efficiency of bubbles. is there. The spout cap BCa is an example configured to suppress the bubble mixing efficiency in this way.

  As shown in FIG. 6, the spout cap BCa includes a first cylinder part 10 (main body part), a second cylinder part 20a, a decompression part 30a (mixing rate adjustment part, air amount adjustment part), an upper throttle A diameter portion 40 (attenuation portion), a packing 50, a spring 60, a lower reduced diameter portion 70, and a rectifying portion 80 are provided.

  The first cylindrical portion 10 is a substantially cylindrical member, and a second cylindrical portion 20a, a pressure reducing portion 30a, an upper reduced diameter portion 40, a packing 50, and a spring 60 are provided inside the cylindrical shape. It functions as a main body part. A mounting screw portion 103 is provided on the upper end side (the negative end side in the y-axis direction) of the first cylindrical portion 10 in the figure. The attachment screw portion 103 is a female screw for attaching the spout cap BCa to the spout of the spout portion B2. Below the mounting screw portion 103 (in the positive direction in the y-axis direction), the packing 50 is provided in an annular shape along the inner wall of the first tube portion 10. The packing 50 is a close contact member for preventing water leakage when the water outlet cap BCa is attached to the water outlet of the spout portion B2.

  When the mounting screw portion 103 of the first tube portion 10 is screwed and attached to the male screw of the spout port of the spout portion B2, the water Wa supplied from the faucet device FC is supplied from the inflow port 101. The water Wa that has entered the first cylinder portion 10 as the main body portion from the inflow port 101 has an internal flow path (the details will be described later, but the second cylinder portion 20a, the pressure reducing portion 30a, the upper reduced diameter portion 40, the lower reduced diameter portion). Through the section 70 and the flow path passing through the rectifying section 80, the water is mixed with bubbles or rectified water (water substantially free of bubbles) and discharged from the discharge port 102 to the outside (bowl section). Water Wb.

  The upper reduced diameter portion 40 is disposed on the downstream side of the packing 50 (the discharge port 102 side, the positive direction in the y-axis direction). The upper narrowed portion 40 includes an annular collar 401 that forms an outer periphery in the shape of a hat collar, and an annular protrusion 402 that is surrounded by the collar 401 and formed in a region including the center. The flange portion 401 is fixed to the second cylindrical portion 20a, and the upper reduced diameter portion 40 and the pressure reducing portion 30a do not move integrally, and only the pressure reducing portion 30a moves independently.

  The annular convex portion 402 is formed so as to protrude upstream from the flange portion 401 (inlet 101 side, negative direction in the y-axis direction). An inflow hole 403 is formed in a region including the center of the annular protrusion 402. The water that has entered from the inflow port 101 hits the upper narrowed diameter portion 40, whereby the pressure fluctuation of the water is attenuated and flows out from the inflow hole 403 to the downstream side. The water flowing out from the inflow hole 403 to the downstream side flows into a water reservoir 404 formed between the upper throttle portion 40 and the decompression portion 30a.

  The decompression unit 30 a is disposed on the downstream side of the upper reduced diameter portion 40. The decompression unit 30a is configured by a decompression plate 301a (pressure receiving plate). The decompression plate 301a is a circular plate member.

  A plurality of injection holes 304a (orifice portions) are formed in the decompression plate 301a so as to form an annular shape. The plurality of injection holes 304 a are formed at positions corresponding to the water reservoir 404. Accordingly, the plurality of injection holes 304 a are provided so as not to be blocked by the flange 401 of the upper narrowed diameter portion 40.

  A recess 303a is provided in a region including the center of the decompression plate 301a. The recess 303a is formed on the upstream surface of the decompression plate 301a. Accordingly, the water flowing out from the inflow hole 403 of the upper narrowed diameter portion 40 to the downstream side is concentrated and centered by the concave portion 303a, and acts to push down the decompression plate 301a along the y-axis direction. Water that has flowed out downstream from the inflow hole 403 of the upper narrowed diameter portion 40 spreads in the outer circumferential direction and is jetted downstream from the plurality of jet holes 304a.

  Between the upper reduced diameter portion 40 and the decompression portion 30a and the first cylinder portion 10, a second cylinder portion 20a is provided. The second cylinder portion 20a includes an upstream first guide portion 201a and a downstream second guide portion 205a.

  A recess for engaging the upper reduced diameter portion 40 is provided at the upper end 206a of the first guide portion 201a (the end on the inlet 101 side, the end in the negative direction in the y-axis direction). It arrange | positions so that the outer periphery of the pressure-reduction board 301a may contact inside the 1st guide part 201a. The decompression plate 301a of the decompression unit 30a is configured to move in the vertical direction (direction along the y-axis) along the inner wall surface of the first guide unit 201a.

  Between the 1st guide part 201a and the 2nd guide part 205a, the air hole 204a (opening part) which introduces air in an internal flow path is provided. The air holes 204a are provided so as to be scattered over the entire circumference of the second cylindrical portion 20a between the first guide portion 201a and the second guide portion 205a.

  A space is provided between the first cylinder portion 10 and the second cylinder portion 20a, and is formed as an air flow path 802. A space between the downstream end of the first cylindrical portion 10 and the downstream end of the second cylindrical portion 20a is open, and is formed as an air inlet 803. The air introduced from the air introduction port 803 is introduced from the air hole 204a to the internal flow path through the air flow path 802.

  A lower reduced diameter portion 70 is disposed inside the second guide portion 205a. The lower reduced diameter portion 70 is a cylindrical member provided with a reduced diameter tapered portion 701 and an enlarged diameter tapered portion 702. The reduced diameter taper portion 701 is provided on the upstream side of the enlarged diameter taper portion 702, and is formed so as to narrow the internal flow path from the upstream side toward the downstream side. The enlarged diameter taper portion 702 is provided on the downstream side of the reduced diameter taper portion 701, and is formed so as to widen the internal flow path from the upstream side toward the downstream side.

  The inclined surface 701a, which is the inner side surface of the reduced diameter taper portion 701, is formed at a position corresponding to the plurality of injection holes 304a of the decompression portion 30a. Accordingly, the water flow WFa injected from the plurality of injection holes 304a of the decompression plate 301a is directed inward by hitting the inclined surface 701a, and enters the gas-liquid interface as the water flow WFb.

  When water is supplied from the inflow port 101 and water is injected from the plurality of injection holes 304a of the decompression plate 301a, the water accumulates from the downstream side, and a gas-liquid interface is formed at a position corresponding to the lower throttle portion 70. The Since the water flow WFb directed by the inclined surface 701a enters the gas-liquid interface while entraining air, bubble-containing water is generated. Due to the action of the decompression plate 301a, a negative pressure is generated between the decompression plate 301a and the lower throttle portion 70, so that air is drawn from the air holes 204a and enters the gas-liquid interface together with water ejected from the plurality of ejection holes 304a. To do. Due to the rush of water flow to the gas-liquid interface, the gas-liquid interface is disturbed and air bubbles are more likely to be mixed. Therefore, a region from the decompression plate 301a to the lower reduced diameter portion 70 is formed as the bubble mixing portion 703.

  The bubble mixed water generated by the bubble mixing unit 703 is rectified by the rectifying grid 801 of the rectifying unit 80 provided on the downstream side of the second guide unit 205a, and discharged from the discharge port 102 to the outside.

  Between the decompression part 30a and the lower diameter reducing part 70, a spring 60 as an urging means is disposed. The spring 60 is disposed so as to wind the outside of the reduced diameter tapered portion 701 of the lower reduced diameter portion 70.

  Accordingly, when water is supplied from the inflow port 101 and the water hits the decompression plate 301a of the decompression unit 30a through the inflow hole 403 of the upper narrowed diameter part 40, the decompression unit 30a has a force to be pushed down from the upstream side to the downstream side. receive. Since the spring 60 is disposed so as to counteract this force, the pressure reducing plate 301a does not move until a predetermined flow rate of water is supplied from the inflow port 101 (or the air hole 204 does not move even if it moves). When water exceeding a predetermined flow rate is supplied from the inflow port 101, it moves downward.

  FIG. 7 shows a state where the decompression plate 301a has moved downward. As shown in FIG. 7, when the water flowing in from the inlet 101 exceeds a predetermined flow rate, the water Wa that flows in has a force that pushes the pressure reducing plate 301a (pressure receiving plate) in the downstream direction (y-axis positive direction). The spring 60 overcomes the force pushing the decompression plate 301a in the upstream direction (y-axis negative direction), so that the decompression plate 301a moves downward from the initial position. Further, since the straightness of the water flow WFa injected from the plurality of injection holes 304a is also improved, the water flow WFa does not hit the inclined surface 701a of the reduced diameter taper portion 701 and enters the gas-liquid interface as it is.

  Comparing FIG. 6 and FIG. 7, in the state shown in FIG. 6, the water flow WFa injected from the plurality of injection holes 304a hits the inclined surface 701a and is divided into increased water flow WFb and enters the gas-liquid interface. doing. On the other hand, in the state shown in FIG. 7, the water flow WFa injected from the plurality of injection holes 304a directly enters the gas-liquid interface. Therefore, in this spout cap BCa, when the amount of water flowing in from the inflow port 101 exceeds a predetermined amount of water, the total extension length in which the outer periphery of the water flow entering the gas-liquid interface comes into contact with the gas-liquid interface decreases. It is configured.

  As described above, in the spout cap BCa, the water injected from the plurality of injection holes 304a as the orifice portion enters the gas-liquid interface while entraining the air, so that the air generated by the entrainment of the air and the deformation of the gas-liquid interface Incorporation is performed, and bubble mixed water is generated by their action. Therefore, using the fact that the amount of air taken in varies according to the outer peripheral length of the water flow entering the gas-liquid interface, the water flow entering the gas-liquid interface when the water flowing from the inlet 101 exceeds a predetermined flow rate. The mixing efficiency is suppressed by reducing the total length of contact between the outer periphery of the gas and the gas-liquid interface.

  As described above, when the water flowing in from the inlet 101 exceeds a predetermined flow rate, an increase in the mixing rate is suppressed by suppressing the bubble mixing efficiency with respect to the water in the bubble mixing unit 703. Since the mixing rate is adjusted only by adjusting the mixing efficiency, which is the ease of mixing water and air, without adjusting the supply amount of water, the increase in the mixing rate can be more easily suppressed.

  Subsequently, a spout cap BCb as a second modification of the spout cap BC according to the present embodiment will be described with reference to FIGS. 8 and 9. FIG.8 and FIG.9 is sectional drawing of the spout cap BCb as a 2nd modification. In the spout cap BC, the decompression unit 30 is provided with a shielding wall 305 that shields the air holes 204, and by moving the decompression unit 30, the opening area of the air holes 204 is changed to adjust the mixing rate. However, the mixing rate adjustment unit that changes the mixing rate of bubbles in the bubble mixing water is not limited to this, and it is also preferable to suppress an increase in the mixing rate by increasing the internal pressure of the bubble mixing unit. is there. The spout cap BCb is an example configured to suppress the bubble mixing efficiency by increasing the internal pressure of the bubble mixing portion.

  As shown in FIG. 8, the spout cap BCb includes a first cylinder part 10 (main body part), a second cylinder part 20b, a decompression part 30b (mixing rate adjustment part, air amount adjustment part), and an upper throttle. A diameter portion 40 (attenuation portion), a packing 50, a spring 60, a lower reduced diameter portion 70, and a rectifying portion 80 are provided.

  The first cylindrical portion 10 is a substantially cylindrical member, and a second cylindrical portion 20b, a pressure reducing portion 30b, an upper reduced diameter portion 40, a packing 50, and a spring 60 are provided inside the cylindrical shape. It functions as a main body part. A mounting screw portion 103 is provided on the upper end side (the negative end side in the y-axis direction) of the first cylindrical portion 10 in the figure. The attachment screw portion 103 is a female screw for attaching the spout cap BCb to the spout of the spout portion B2. Below the mounting screw portion 103 (in the positive direction in the y-axis direction), the packing 50 is provided in an annular shape along the inner wall of the first tube portion 10. The packing 50 is a close contact member for preventing water leakage when the water outlet cap BCb is attached to the water outlet of the spout portion B2.

  When the mounting screw portion 103 of the first tube portion 10 is screwed and attached to the male screw of the spout port of the spout portion B2, the water Wa supplied from the faucet device FC is supplied from the inflow port 101. The water Wa that has entered the first cylinder portion 10 as the main body portion from the inflow port 101 has an internal flow path (details will be described later, but the second cylinder portion 20b, the decompression portion 30b, the upper reduced diameter portion 40, the lower reduced diameter diameter). Through the section 70 and the flow path passing through the rectifying section 80, the water is mixed with bubbles or rectified water (water substantially free of bubbles) and discharged from the discharge port 102 to the outside (bowl section). Water Wb.

  The upper reduced diameter portion 40 is disposed on the downstream side of the packing 50 (the discharge port 102 side, the positive direction in the y-axis direction). The upper narrowed portion 40 includes an annular collar 401 that forms an outer periphery in the shape of a hat collar, and an annular protrusion 402 that is surrounded by the collar 401 and formed in a region including the center. The flange portion 401 is fixed to the second cylindrical portion 20a, and the upper reduced diameter portion 40 and the pressure reducing portion 30b do not move integrally, and only the pressure reducing portion 30b moves independently.

  The annular convex portion 402 is formed so as to protrude upstream from the flange portion 401 (inlet 101 side, negative direction in the y-axis direction). An inflow hole 403 is formed in a region including the center of the annular protrusion 402. The water that has entered from the inflow port 101 hits the upper narrowed diameter portion 40 to attenuate the water pressure, and flows out from the inflow hole 403 to the downstream side. The water flowing out from the inflow hole 403 to the downstream side flows into a water reservoir 404 formed between the upper throttle portion 40 and the decompression portion 30a.

  The decompression unit 30 b is disposed on the downstream side of the upper reduced diameter portion 40. The decompression unit 30b includes a decompression plate 301b (pressure receiving plate), a connection portion 306b, and a large diameter portion 307b. The decompression plate 301a is a circular plate member. The connecting portion 306b is a portion provided to connect the decompression plate 301b and the large diameter portion 307b, and extends from the downstream surface of the decompression plate 301b toward the rectifying unit 80. The large-diameter portion 307b is for increasing the flow resistance in the rectifying portion 80, and is a disk-shaped portion having a larger diameter than the connection portion 306b.

  A plurality of injection holes 304b (orifice portions) are formed in the decompression plate 301b so as to form an annular shape. The plurality of injection holes 304 b are formed at positions corresponding to the water reservoir 404. Therefore, the plurality of injection holes 304b are provided so as not to be blocked by the flange 401 of the upper reduced diameter portion 40.

  A recess 303b is provided in a region including the center of the decompression plate 301b. The recess 303b is formed on the upstream surface of the decompression plate 301b. Therefore, the water flowing out from the inflow hole 403 of the upper narrowed diameter portion 40 is concentrated and centered by the concave portion 303b, and acts to push down the decompression plate 301b along the y-axis direction. The water flowing out from the inflow hole 403 of the upper reduced diameter portion 40 to the downstream side spreads in the outer peripheral direction and is jetted downstream from the plurality of jet holes 304b.

  A second cylindrical portion 20 b is provided between the upper reduced diameter portion 40 and the decompression portion 30 b and the first cylindrical portion 10. The second cylinder portion 20b includes an upstream first guide portion 201b and a downstream second guide portion 205b.

  A recess for engaging the upper reduced diameter portion 40 is provided at the upper end 206b (the end on the inflow port 101 side, the end in the negative direction in the y-axis direction) of the first guide portion 201b. It arrange | positions so that the outer periphery of the pressure-reduction board 301b may contact the inner side of the 1st guide part 201b. The decompression plate 301b of the decompression unit 30b is configured to move in the vertical direction (the direction along the y axis) along the inner wall surface of the first guide unit 201b.

  Between the first guide part 201b and the second guide part 205b, an air hole 204b for introducing air into the internal flow path is provided. The air holes 204b are provided so as to be scattered over the entire circumference of the second cylindrical portion 20b between the first guide portion 201b and the second guide portion 205b.

  A space is provided between the first cylinder part 10 and the second cylinder part 20b, and is formed as an air flow path 802. A space between the downstream end of the first cylindrical portion 10 and the downstream end of the second cylindrical portion 20b is open, and is formed as an air inlet 803. The air introduced from the air introduction port 803 is introduced from the air hole 204b to the internal flow path through the air flow path 802.

  A lower reduced diameter portion 70 is disposed inside the second guide portion 205b. The lower reduced diameter portion 70 is a cylindrical member provided with a reduced diameter tapered portion 701 and an enlarged diameter tapered portion 702. The reduced diameter taper portion 701 is provided on the upstream side of the enlarged diameter taper portion 702, and is formed so as to narrow the internal flow path from the upstream side toward the downstream side. The enlarged diameter taper portion 702 is provided on the downstream side of the reduced diameter taper portion 701, and is formed so as to widen the internal flow path from the upstream side toward the downstream side.

  The inclined surface 701a, which is the inner side surface of the reduced diameter taper portion 701, is formed at a position corresponding to the plurality of injection holes 304b of the decompression portion 30b. Accordingly, the water flow injected from the plurality of injection holes 304b of the decompression plate 301b is directed inward against the inclined surface 701a, and enters the gas-liquid interface as a divided water flow.

  The upper end 701b of the reduced diameter taper portion 701 is formed so as to be able to come into contact when the decompression plate 301b is lowered. Therefore, when the decompression plate 301b descends and comes into contact with the upper end 701b of the diameter-reduced taper portion 701, supply of air introduced from the air hole 204b to the bubble mixing portion 703 is restricted.

  When water is supplied from the inflow port 101 and water is injected from the plurality of injection holes 304b of the decompression plate 301b, the water accumulates from the downstream side, and a gas-liquid interface is formed at a position corresponding to the lower throttle portion 70. The Since the water flow directed by the inclined surface 701a enters the gas-liquid interface while entraining air, bubble-containing water is generated. Due to the action of the pressure reducing plate 301b, a negative pressure is generated between the pressure reducing plate 301b and the lower throttle portion 70, so that air is drawn from the air holes 204b and enters the gas-liquid interface together with water jetted from the plurality of jet holes 304b. To do. Due to the rush of water flow to the gas-liquid interface, the gas-liquid interface is disturbed and air bubbles are more likely to be mixed. Therefore, a region from the decompression plate 301b to the lower reduced diameter portion 70 is formed as the bubble mixing portion 703.

  The bubble mixed water generated by the bubble mixing unit 703 is rectified by the rectifying grid 801 of the rectifying unit 80 provided on the downstream side of the second guide unit 205b, and discharged from the discharge port 102 to the outside.

  A spring 60b as an urging unit is disposed between the decompression unit 30b and the lower diameter reducing unit 70. The spring 60b is disposed so as to wind around the outside of the reduced diameter tapered portion 701 of the lower reduced diameter portion 70.

  Therefore, when water is supplied from the inflow port 101 and passes through the inflow hole 403 of the upper reduced diameter portion 40 and hits the pressure reducing plate 301b of the pressure reducing portion 30b, the pressure reducing portion 30b has a force to be pushed down from the upstream side to the downstream side. receive. Since the spring 60b is arranged so as to oppose this force, the pressure reducing plate 301b does not move until a predetermined flow rate of water is supplied from the inlet 101 (or the air hole 204b does not move even if it moves). When water exceeding a predetermined flow rate is supplied from the inflow port 101, it moves downward.

  FIG. 9 shows a state where the decompression plate 301b has moved downward. As shown in FIG. 9, when the water flowing in from the inlet 101 exceeds a predetermined flow rate, the water Wa that flows in has a force to push the pressure reducing plate 301b (pressure receiving plate) in the downstream direction (y-axis positive direction). The spring 60b overcomes the force pushing the decompression plate 301b in the upstream direction (y-axis negative direction), so that the decompression plate 301b moves downward from the initial position. Along with the movement of the decompression plate 301b, the large diameter portion 307b also moves, and a part of the rectifying unit 80 is closed to increase the flow path resistance in the rectifying unit 80. Further, when the decompression plate 301b comes into contact with the upper end 701b of the reduced diameter tapered portion 701, the supply of air is stopped.

  In this spout cap BCb, the rectifying unit 80 for converging and rectifying the bubble mixed water generated in the bubble mixing unit 703 is provided between the bubble mixing unit 703 and the discharge port 102, so that it is neat and clean. Foam water discharge can be performed. Moreover, since the internal pressure in the bubble mixing part 703 is increased by increasing the flow path resistance of the rectifying unit 80, it is possible to adjust the bubble mixing rate with a simple configuration without providing a separate device for increasing the flow path resistance. it can.

  In this spout cap BCb, the decompression unit 30b functioning as a mixing rate adjustment unit has a decompression plate 301b as a pressure receiving plate that receives water flowing out from the attenuation unit 40 in a region including the center thereof, and the decompression plate 301b is It is configured to be able to advance and retract along the internal flow path by the force acting from the received water. Therefore, even if there is a fluctuation in the pressure of water entering from the inflow port 101, it is received in the region including the center of the decompression plate 301b, so that it can move stably along the internal flow path without tilting. When the amount of water received by the decompression plate 301b exceeds the threshold amount of water, the decompression unit 30b as the mixing rate adjustment unit moves so as to narrow the cross-sectional area of the internal flow path in the rectifying unit 80, so that air bubbles are mixed in with a simple and stable configuration. The rate can be adjusted.

  Subsequently, a water outlet cap BD according to a second embodiment of the present invention will be described with reference to FIGS. 10 and 11. FIG.10 and FIG.11 is sectional drawing of the spout cap BBD as 2nd embodiment.

  As shown in FIG. 10, the spout cap BD includes a first cylinder part 11 (main body part), a second cylinder part 21 (main body part), and a decompression part 31 (mixing rate adjustment part, air amount adjustment part). And an upper reduced diameter portion 41 (attenuating portion), a packing 51, a spring 61, a lower reduced diameter portion 71, and a rectifying portion 81 (main body portion).

  The 1st cylinder part 11 is a substantially cylindrical member, Comprising: Packing 51 is accommodated in the inside of the cylinder shape, and the 2nd cylinder part 21 and the rectification | straightening part 81 are provided so that it may extend in the downstream. . Therefore, in the case of this embodiment, the main body part is comprised by the 1st cylinder part 11, the 2nd cylinder part 21, and the rectification | straightening part 81. FIG. An attachment screw portion 113 is provided on the upper end side (the negative end side in the y-axis direction) of the first cylindrical portion 11 in the drawing. The attachment screw portion 113 is a female screw for attaching the spout cap BD to the spout of the spout portion B2. Below the mounting screw portion 113 (in the positive direction in the y-axis direction), the packing 51 is provided in an annular shape along the inner wall of the first cylindrical portion 11. The packing 51 is a close contact member for preventing water leakage when the water outlet cap BD is attached to the water outlet of the spout portion B2.

  When the attachment screw portion 113 of the first cylinder portion 11 is attached by being screwed with the male screw of the water outlet of the spout portion B 2, the water Wa supplied from the faucet device FC is supplied from the inflow port 111. The water Wa that has entered the first cylinder portion 11 as the main body portion from the inflow port 111 has an internal flow path (details will be described later, but the second cylinder portion 21, the pressure reducing portion 31, the upper reduced diameter portion 41, the lower reduced diameter portion). Through the section 71 and the flow path passing through the rectifying section 81) and becomes bubble mixed water or rectified water (water substantially free of bubbles) and is discharged from the discharge port 112 to the outside (bowl section). Water Wb.

  The upper reduced diameter portion 41 is disposed on the downstream side of the packing 51 (the discharge port 112 side, the positive direction in the y-axis direction). The upper reduced diameter portion 41 includes an annular collar portion 411 that forms an outer periphery in the shape of a hat collar, and an annular convex portion 412 that is surrounded by the collar portion 411 and formed in a region including the center. The flange part 411 is fixed to the second cylinder part 21, and the upper reduced diameter part 41 and the pressure reducing part 31 do not move integrally, and only the pressure reducing part 31 moves independently.

  The annular convex portion 412 is formed so as to protrude from the flange portion 411 to the upstream side (the inlet 111 side, the negative direction in the y-axis direction). An inflow hole 413 is formed in a region including the center of the annular convex portion 412. The water that has entered from the inflow port 111 strikes the upper narrowed diameter portion 41 to attenuate the water pressure, and flows out from the inflow hole 413 to the downstream side. The water flowing out from the inflow hole 413 to the downstream side flows into the water reservoir 414 formed between the upper throttle part 41 and the decompression part 31.

  The decompression unit 31 is disposed on the downstream side of the upper reduced diameter portion 41. The decompression unit 31 includes a decompression plate 311 (pressure receiving plate), a large-diameter projection 316, and a small-diameter projection 317. The decompression plate 311 is a circular plate member. The large-diameter protrusion 316 is a portion that extends from the downstream surface of the decompression plate 311 toward the rectifying unit 80. The small-diameter protrusion 317 is a part that extends toward the rectifying unit 80 on the downstream side of the large-diameter protrusion 316. Therefore, the large diameter protrusion 316 and the small diameter protrusion 317 are configured to protrude from the decompression plate 311 as stepped bars.

  A plurality of injection holes 314 (orifice portions) are formed in the decompression plate 311 so as to form an annular shape. The plurality of injection holes 314 are formed at positions corresponding to the water reservoir 414. Accordingly, the plurality of injection holes 314 are provided so as not to be blocked by the flange portion 411 of the upper narrowed diameter portion 41.

  A second cylinder portion 21 is provided outside the upper reduced diameter portion 41 and the decompression portion 31 and downstream of the first cylinder portion 11. The second cylinder part 21 includes an upstream first guide part 211 and a downstream second guide part 215.

  A recess for engaging the upper reduced diameter portion 41 is provided at the upper end 212 of the first guide portion 211 (the end on the inflow port 111 side, the end in the negative direction in the y-axis direction). An inner periphery of the first guide portion 211 is disposed so that the outer periphery of the decompression plate 311 contacts. The decompression plate 311 of the decompression unit 31 is configured to move in the vertical direction (the direction along the y-axis) along the inner wall surface of the first guide unit 211.

  Between the first guide part 211 and the second guide part 215, an air hole 211a for introducing air into the internal flow path is provided. The air holes 211 a are provided so as to be scattered over the entire circumference of the second cylindrical portion 21 between the first guide portion 211 and the second guide portion 215.

  A lower reduced diameter portion 71 is disposed inside the second guide portion 215. The lower reduced diameter portion 71 is a cylindrical member provided with a reduced diameter tapered portion 711 and an enlarged diameter tapered portion 712. The reduced diameter tapered portion 711 is provided on the upstream side of the enlarged diameter tapered portion 712, and is formed so as to narrow the internal flow path from the upstream side toward the downstream side. The enlarged diameter tapered portion 712 is provided on the downstream side of the reduced diameter tapered portion 711, and is formed so as to widen the internal flow path from the upstream side toward the downstream side.

  The inclined surface 711 a that is the inner side surface of the reduced diameter tapered portion 711 is formed at a position corresponding to the plurality of injection holes 314 of the decompression portion 31. Accordingly, the water flow injected from the plurality of injection holes 314 of the decompression plate 311 strikes the inclined surface 711a and is directed inward to enter the gas-liquid interface.

  The upper end 711b of the reduced diameter taper portion 711 is formed so as to be able to come into contact when the decompression plate 311 descends. Therefore, when the decompression plate 311 descends and comes into contact with the upper end 711b of the reduced diameter taper portion 711, the supply of air introduced from the air hole 211a to the bubble mixing portion 713 is restricted. Therefore, in this embodiment, the gap 214 between the upper end 711b of the reduced diameter tapered portion 711 and the pressure reducing plate 311 also functions as an opening.

  When water is supplied from the inflow port 111 and water is injected from the plurality of injection holes 314 of the decompression plate 311, the water accumulates from the downstream side, and a gas-liquid interface is formed at a position corresponding to the lower throttle portion 71. The Since the water flow directed by the inclined surface 711a enters the gas-liquid interface while entraining air, the bubble-containing water is generated. Due to the action of the decompression plate 311, a negative pressure is generated between the decompression plate 311 and the lower diameter reducing portion 71. Plunge into the interface. Due to the rush of water flow to the gas-liquid interface, the gas-liquid interface is disturbed and air bubbles are more likely to be mixed. Therefore, the region from the decompression plate 311 to the lower reduced diameter portion 71 is formed as the bubble mixing portion 713.

  The bubble mixed water generated by the bubble mixing unit 713 is rectified by the rectifying grid 811 of the rectifying unit 81 provided on the downstream side of the second guide unit 215, and discharged from the discharge port 112 to the outside.

  A spring 61 as an urging unit is disposed between the decompression unit 31 and the rectification unit 81. The spring 61 is disposed so as to wind around the small-diameter protrusion 317 of the decompression unit 31. The small diameter protrusion 317 is inserted through a guide hole 814 provided in the center of the rectifying unit 81.

  Therefore, when water is supplied from the inflow port 111 and water hits the decompression plate 311 of the decompression unit 31 through the inflow hole 413 of the upper narrowed diameter part 41, the decompression unit 31 has a force to be pushed down from the upstream side to the downstream side. receive. Since the spring 61 is arranged so as to oppose this force, the pressure reducing plate 311 does not move until a predetermined flow rate of water is supplied from the inlet 111 (or even if it moves, the gap 214 is closed). When water exceeding a predetermined flow rate is supplied from the inflow port 111, it moves downward.

  FIG. 11 shows a state where the decompression plate 311 moves downward. As shown in FIG. 11, when the water flowing in from the inflow port 111 exceeds a predetermined flow rate, the water Wa flowing in has a force to push the pressure reducing plate 311 (pressure receiving plate) in the downstream direction (y-axis positive direction). The spring 61 overcomes the force pushing the decompression plate 311 in the upstream direction (y-axis negative direction), so that the decompression plate 311 moves downward from the initial position. As the decompression plate 311 moves, the gap 214 is narrowed and the supply of air into the bubble mixing part 713 is restricted. Further, when the decompression plate 311 comes into contact with the upper end 711b of the reduced diameter tapered portion 711 and the gap 214 is closed, the supply of air is stopped.

  As described above, the water discharge cap BD (water discharge device) of the present embodiment is a water discharge device capable of discharging bubble-mixed water, and includes a discharge port 112 for discharging water Wb and a discharge port 112. The first cylinder part 11, the second cylinder part 21, and the rectification part 81 in which an inlet 111 for allowing water Wa to be discharged from the water supply source and an internal flow path from the inlet 111 to the outlet 112 are formed. (Main body part), a plurality of injection holes 314 (orifice parts) for injecting water flowing in from the inlet 111 toward the downstream side of the internal flow path, and air holes 211a and gaps for introducing air into the internal flow path Air bubbles mixed in the air holes 211a and the gaps 214 are formed in the air holes 211a and the gaps 214 and mixed into the water sprayed from the plurality of spray holes 314 to form the bubble mixed water and are supplied to the discharge port 112. Part 713 and bubbles It includes a pressure reducing unit 31 for adjusting the mixing ratio of the bubbles mixed into bubbly water (mixing ratio adjustment unit), the at join the club 713. The decompression unit 31 functioning as a mixing rate adjusting unit increases the mixing rate until the water flowing from the inlet 111 reaches a predetermined flow rate, and increases the mixing rate when the water flowing from the inlet 111 exceeds the predetermined flow rate. It acts to suppress. Therefore, there exists an effect equivalent to the spout cap part BC which concerns on 1st embodiment.

  Subsequently, a spout cap BDa as a first modification of the spout cap BD according to the present embodiment will be described with reference to FIGS. 12 and 13. FIG.12 and FIG.13 is sectional drawing of the spout cap BDa as a 1st modification. In the spout cap BD, a gap 214 is provided between the pressure reducing part 31 and the lower diameter reducing part 71, and by moving the pressure reducing part 31, the opening area of the gap 214 as an opening is changed to adjust the mixing rate. Met. However, the mixing rate adjusting unit that changes the mixing rate of bubbles in the bubble mixing water is not limited to this, and it is also preferable to suppress an increase in the mixing rate by suppressing the force of drawing air. is there. The spout cap BDa is an example configured to suppress the mixing efficiency of bubbles as described above.

  As shown in FIG. 12, the spout cap BDa includes a first cylinder part 11 (main body part), a second cylinder part 21a (main body part), and a decompression part 31a (mixing rate adjustment part, air amount adjustment part). And an upper reduced diameter portion 41 (attenuating portion), a packing 51, a lower reduced diameter portion 72, and a rectifying portion 81 (main body portion).

  The 1st cylinder part 11 is a substantially cylindrical member, Comprising: The packing 51 is accommodated in the inside of the cylindrical shape, and the 2nd cylinder part 21a and the rectification | straightening part 81 are provided so that it may extend in the downstream. . Therefore, in the case of this embodiment, the main body part is comprised by the 1st cylinder part 11, the 2nd cylinder part 21a, and the rectification | straightening part 81. FIG. An attachment screw portion 113 is provided on the upper end side (the negative end side in the y-axis direction) of the first cylindrical portion 11 in the drawing. The attachment screw portion 113 is a female screw for attaching the spout cap BDa to the spout of the spout portion B2. Below the mounting screw portion 113 (in the positive direction in the y-axis direction), the packing 51 is provided in an annular shape along the inner wall of the first cylindrical portion 11. The packing 51 is a close contact member for preventing water leakage when the water outlet cap BDa is attached to the water outlet of the spout part B2.

  When the attachment screw portion 113 of the first cylinder portion 11 is attached by being screwed with the male screw of the water outlet of the spout portion B 2, the water Wa supplied from the faucet device FC is supplied from the inflow port 111. The water Wa that has entered the first cylinder portion 11 as the main body portion from the inflow port 111 has an internal flow path (details will be described later, but the second cylinder portion 21a, the pressure reducing portion 31a, the upper reduced diameter portion 41, the lower reduced diameter portion Through the section 72 and the flow path passing through the rectifying section 81) and becomes bubble mixed water or rectified water (water in which bubbles are not substantially mixed) and discharged from the discharge port 112 to the outside (bowl section). Water Wb.

  The upper reduced diameter portion 41 is disposed on the downstream side of the packing 51 (the discharge port 112 side, the positive direction in the y-axis direction). The upper reduced diameter portion 41 includes an annular collar portion 411 that forms an outer periphery in the shape of a hat collar, and an annular convex portion 412 that is surrounded by the collar portion 411 and formed in a region including the center. The collar part 411 is fixed to the second cylinder part 21a.

  The annular convex portion 412 is formed so as to protrude from the flange portion 411 to the upstream side (the inlet 111 side, the negative direction in the y-axis direction). An inflow hole 413 is formed in a region including the center of the annular convex portion 412. The water that has entered from the inflow port 111 strikes the upper narrowed diameter portion 41 to attenuate the water pressure, and flows out from the inflow hole 413 to the downstream side. The water flowing out from the inflow hole 413 to the downstream side flows into a water storage portion 414 formed between the upper throttle portion 41 and the decompression portion 31a.

  The decompression unit 31 a is disposed on the downstream side of the upper reduced diameter portion 41. The decompression unit 31a includes a decompression plate 311a (pressure receiving plate) and a lower protrusion 312a. The decompression plate 311a is a circular plate member. The lower protrusion 312a is a protrusion extending downstream from the outer peripheral portion of the decompression plate 311a. The lower protrusion 312a is in contact with the second cylinder portion 21a and the lower reduced diameter portion 72, and forms a gap 214a between the lower reduced diameter portion 72 and the decompression plate 311a.

  A plurality of injection holes 314a (orifice portions) are formed in the decompression plate 311a so as to form an annular shape. The plurality of injection holes 314a are formed at positions corresponding to the water reservoir 414. Accordingly, the plurality of injection holes 314 a are provided so as not to be blocked by the flange portion 411 of the upper reduced diameter portion 41.

  In the case of this example, a duckbill 315a is provided in a part of the plurality of injection holes 314a. The duckbill 315a is formed of a deformable member (for example, resin), and is formed so that the water is opened when the amount of water increases. The duckbill 315a is attached to the downstream surface of the decompression plate 311a.

  A second cylinder part 21 a is provided outside the upper reduced diameter part 41 and the decompression part 31 a and on the downstream side of the first cylinder part 11. The second cylinder portion 21a includes an upstream first guide portion 216a and a downstream second guide portion 215a.

  A recess for engaging the upper reduced diameter portion 41 is provided at the upper end 212a of the first guide portion 216a (the end on the inlet 111 side, the end in the negative direction in the y-axis direction). Inside the first guide portion 216a, the outer periphery of the decompression plate 311a and the lower protrusion 312a are disposed so as to contact each other.

  An air hole 216aa for introducing air into the internal flow path is provided between the first guide part 216a and the second guide part 215a. The air holes 216aa are provided between the first guide part 216a and the second guide part 215a so as to be scattered over the entire circumference of the second cylinder part 21a.

  A lower reduced diameter portion 72 is disposed inside the second guide portion 215a. The lower reduced diameter portion 72 is a cylindrical member provided with a reduced diameter tapered portion 721 and an enlarged diameter tapered portion 722. The reduced diameter tapered portion 721 is provided on the upstream side of the enlarged diameter tapered portion 722, and is formed so as to narrow the internal flow path from the upstream side toward the downstream side. The enlarged diameter tapered portion 722 is provided on the downstream side of the reduced diameter tapered portion 721, and is formed so as to widen the internal flow path from the upstream side toward the downstream side.

  An inclined surface 721a that is an inner side surface of the reduced diameter tapered portion 721 is formed at a position corresponding to the plurality of injection holes 314a of the decompression portion 31a. Accordingly, the water flow injected from the plurality of injection holes 314a of the decompression plate 311a strikes the inclined surface 721a and is directed inward to enter the gas-liquid interface.

  When water is supplied from the inflow port 111 and water is injected from the plurality of injection holes 314a of the decompression plate 311a, the water accumulates from the downstream side, and a gas-liquid interface is formed at a position corresponding to the lower throttle part 72. The Since the water flow directed by the inclined surface 721a enters the gas-liquid interface while entraining air, bubble-containing water is generated. Due to the action of the decompression plate 311a, a negative pressure is generated between the decompression plate 311a and the lower throttle portion 72, so that air is drawn from the air holes 216aa and the gap 214a, and the gas and liquid together with water ejected from the plurality of ejection holes 314a. Plunge into the interface. Due to the rush of water flow to the gas-liquid interface, the gas-liquid interface is disturbed and air bubbles are more likely to be mixed. Therefore, the region from the decompression plate 311a to the lower reduced diameter portion 72 is formed as the bubble mixing portion 713.

  The bubble mixed water generated by the bubble mixing unit 713 is rectified by the rectifying grid 811 of the rectifying unit 81 provided on the downstream side of the second guide unit 215a, and discharged from the discharge port 112 to the outside.

  In the case of this embodiment, the duckbill 315a is attached to some injection holes 314a of the plurality of injection holes 314a. Accordingly, when water is supplied from the inflow port 111 and reaches the injection hole 314a formed in the pressure reducing plate 311a of the pressure reducing part 31a through the inflow hole 413 of the upper narrowed diameter part 41, the duck bill 315a receives a force to be expanded. . The movement of the duckbill 315a does not open until a predetermined flow rate of water is supplied from the inflow port 111, but opens when water exceeding a predetermined flow rate is supplied from the inflow port 111.

  FIG. 13 shows a state where the duckbill 315a is opened. As shown in FIG. 13, when the water flowing in from the inlet 111 exceeds a predetermined flow rate, the water Wa that flows in wins the force to push and spread the duck bill 315 a, and the duck bill 315 a opens to open the duck bill. Water also passes through the injection hole 314a to which the 315a is attached. As a result, if the whole of the plurality of injection holes 314a is viewed, the opening area is increased, so that an increase in the flow rate of water injected from the plurality of injection holes 314a is suppressed.

  In this example, the duckbill 315a is attached to some of the injection holes 314a. However, it is also preferable to provide an opening in advance at the tip of the duckbill 315a and attach it to all of the injection holes 314a. If it does in this way, it can comprise so that the opening area of each injection hole 314a may be expanded with the increase in the amount of water.

  Thus, when the water flowing in from the inflow port 111 exceeds a predetermined flow rate, the increase in the flow velocity of the water injected from the plurality of injection holes 314a is suppressed by widening the opening area of the plurality of injection holes 314a. With a simple configuration in which the total area of the entire injection hole 314a is increased, an increase in the flow rate of water injected from the plurality of injection holes 314a can be easily suppressed.

  In other words, when the water flowing in from the inflow port 111 exceeds a predetermined flow rate, the air flow from the air holes 216aa and the gaps 214a as the openings is suppressed by suppressing an increase in the flow velocity of the water injected from the plurality of injection holes 314a. Since the pulling-in force is suppressed, the amount of air introduced can be additionally suppressed by one operation of suppressing the increase in the flow velocity of the injected water. Therefore, there is no need to provide a separate device such as a pump that can vary the force for forcibly sending in air, so that an increase in the mixing rate can be reliably suppressed with a simpler configuration.

  From the viewpoint of suppressing the force of drawing air from the air hole 216aa and the gap 214a as the opening, it is also preferable to form a path from the decompression plate 311a to the downstream side in addition to the plurality of injection holes 314a. It is. An example of this preferred embodiment will be described with reference to FIGS. 14 and 15 are cross-sectional views of a water discharge cap BDb as a second modification.

  As shown in FIG. 14, the spout cap BDb includes a first cylinder part 11 (main body part), a second cylinder part 21 b (main body part), and a decompression part 31 b (mixing rate adjustment part, air amount adjustment part). And an upper reduced diameter portion 41 (attenuating portion), a packing 51, a lower reduced diameter portion 72, and a rectifying portion 81 (main body portion).

  The 1st cylinder part 11 is a substantially cylindrical member, Comprising: The packing 51 is accommodated in the inside of the cylinder shape, and the 2nd cylinder part 21b and the rectification | straightening part 81 are provided so that it may extend in the downstream. . Therefore, in the case of this embodiment, the main body part is comprised by the 1st cylinder part 11, the 2nd cylinder part 21b, and the rectification | straightening part 81. FIG. An attachment screw portion 113 is provided on the upper end side (the negative end side in the y-axis direction) of the first cylindrical portion 11 in the drawing. The attachment screw portion 113 is a female screw for attaching the spout cap BDb to the spout of the spout portion B2. Below the mounting screw portion 113 (in the positive direction in the y-axis direction), the packing 51 is provided in an annular shape along the inner wall of the first cylindrical portion 11. The packing 51 is a close contact member for preventing water leakage when the water outlet cap BDb is attached to the water outlet of the spout portion B2.

  When the attachment screw portion 113 of the first cylinder portion 11 is attached by being screwed with the male screw of the water outlet of the spout portion B 2, the water Wa supplied from the faucet device FC is supplied from the inflow port 111. The water Wa that has entered the first cylindrical portion 11 as the main body portion from the inflow port 111 has an internal flow path (details will be described later, but the second cylindrical portion 21b, the decompression portion 31b, the upper reduced diameter portion 41, the lower reduced diameter) Through the section 71 and the flow path passing through the rectifying section 81) and becomes bubble mixed water or rectified water (water substantially free of bubbles) and is discharged from the discharge port 112 to the outside (bowl section). Water Wb.

  The upper reduced diameter portion 41 is disposed on the downstream side of the packing 51 (the discharge port 112 side, the positive direction in the y-axis direction). The upper reduced diameter portion 41 includes an annular collar portion 411 that forms an outer periphery in the shape of a hat collar, and an annular convex portion 412 that is surrounded by the collar portion 411 and formed in a region including the center. The collar part 411 is fixed to the second cylinder part 21b.

  The annular convex portion 412 is formed so as to protrude from the flange portion 411 to the upstream side (the inlet 111 side, the negative direction in the y-axis direction). An inflow hole 413 is formed in a region including the center of the annular convex portion 412. The water that has entered from the inflow port 111 strikes the upper narrowed diameter portion 41 to attenuate the water pressure, and flows out from the inflow hole 413 to the downstream side. The water flowing out from the inflow hole 413 to the downstream side flows into a water storage part 414 formed between the upper throttle part 41 and the decompression part 31b.

  The decompression unit 31 b is disposed on the downstream side of the upper reduced diameter portion 41. The decompression unit 31b includes a decompression plate 311b (pressure receiving plate) and an opening adjustment unit 32b. The decompression plate 311b is a circular plate member. The opening adjusting portion 32b serves to expand the opening area of the decompression plate 311b when the amount of water entering from the inlet 111 increases.

  The decompression plate 311b has a plurality of injection holes 314b (orifice portions) formed in an annular shape. The plurality of injection holes 314b are formed at a position corresponding to the water reservoir 414. Accordingly, the plurality of injection holes 314 b are provided so as not to be blocked by the flange portion 411 of the upper reduced diameter portion 41.

  In the case of this example, a water passage hole 316b is provided in addition to the plurality of injection holes 314b. An adjustment plate 321b of the opening adjustment portion 32b is provided so as to cover the downstream side of the water passage hole 316b. When the flow rate of water entering from the inflow port 111 exceeds the flow rate, a gap is formed between the adjustment plate 321b and the decompression plate 311b, and water is also passed through the water passage hole 316b.

  A second cylinder part 21 b is provided outside the upper reduced diameter part 41 and the decompression part 31 b and downstream of the first cylinder part 11.

  The second cylindrical portion 21b is provided with an air hole 211b for introducing air into the internal flow path. The air holes 211b are provided so as to be scattered over the entire circumference of the second cylindrical portion 21b.

  A lower reduced diameter portion 71 is disposed inside and downstream of the second cylindrical portion 21b. The lower reduced diameter portion 71 is a cylindrical member provided with a reduced diameter tapered portion 711 and an enlarged diameter tapered portion 712. The reduced diameter tapered portion 711 is provided on the upstream side of the enlarged diameter tapered portion 712, and is formed so as to narrow the internal flow path from the upstream side toward the downstream side. The enlarged diameter tapered portion 712 is provided on the downstream side of the reduced diameter tapered portion 711, and is formed so as to widen the internal flow path from the upstream side toward the downstream side.

  The inclined surface 711a that is the inner side surface of the reduced diameter tapered portion 711 is formed at a position corresponding to the plurality of injection holes 314b of the decompression portion 31b. Therefore, the water flow injected from the plurality of injection holes 314b of the decompression plate 311b strikes the inclined surface 711a and is directed inward to enter the gas-liquid interface.

  When water is supplied from the inflow port 111 and water is injected from the plurality of injection holes 314b of the decompression plate 311b, the water accumulates from the downstream side, and a gas-liquid interface is formed at a position corresponding to the lower throttle part 71. The Since the water flow directed by the inclined surface 711a enters the gas-liquid interface while entraining air, the bubble-containing water is generated. Due to the action of the decompression plate 311b, a negative pressure is generated between the decompression plate 311b and the lower throttle portion 71, so that air is drawn from the air holes 211b and enters the gas-liquid interface together with water ejected from the plurality of ejection holes 314b. To do. Due to the rush of water flow to the gas-liquid interface, the gas-liquid interface is disturbed and air bubbles are more likely to be mixed. Therefore, the region from the decompression plate 311b to the lower reduced diameter portion 71 is formed as the bubble mixing portion 713.

  The bubble mixed water generated by the bubble mixing unit 713 is rectified by the rectifying grid 811 of the rectifying unit 81 provided on the downstream side, and discharged from the discharge port 112 to the outside.

  FIG. 15 shows a state where a gap is formed between the adjustment plate 321b and the decompression plate 311b. As shown in FIG. 15, when the water flowing in from the inflow port 111 exceeds a predetermined flow rate, the force that the inflowing water Wa tries to push and spread the adjusting plate 321b wins, and the adjusting plate 321b becomes the decompression plate 311b. The water also passes through the water passage hole 316b. As a result, a path to reach the downstream side of the decompression plate 311b is formed in addition to the plurality of injection holes 314a, so that the opening area increases as a whole, and the water injected from the plurality of injection holes 314b Increase in flow rate is suppressed.

  In this way, when the water flowing in from the inlet 111 exceeds a predetermined flow rate, the flow rate of water injected from the plurality of injection holes 314b is suppressed by forming a path through which water passes in addition to the plurality of injection holes 314b. I am going to do it. Therefore, if nothing is done, water passing through the plurality of injection holes 314b constituting the orifice portion is passed through a path other than the plurality of injection holes 314b, and an increase in the amount of water passing through the plurality of injection holes 314b is suppressed. An increase in the flow rate of water injected from the hole 314b can be reliably suppressed.

  From the viewpoint of suppressing the increase in the mixing rate by suppressing the mixing efficiency of the bubbles into the bubble-containing water, it is also preferable to suppress the increase in the flow rate of water entering the gas-liquid interface. An example of this preferred embodiment will be described with reference to FIGS. FIG.16 and FIG.17 is sectional drawing of the spout cap BDc as a 3rd modification.

  As shown in FIG. 16, the spout cap BDc includes a first cylinder part 11 (main body part), a second cylinder part 21c (main body part), and a decompression part 31c (mixing rate adjustment part, air amount adjustment part). And an upper reduced diameter portion 41c (attenuating portion), a packing 51, a lower reduced diameter portion 74, and a rectifying portion 81 (main body portion).

  The 1st cylinder part 11 is a substantially cylindrical member, Comprising: The packing 51 is accommodated in the inside of the cylindrical shape, and the 2nd cylinder part 21c and the rectification | straightening part 81 are provided so that it may extend in the downstream. . Therefore, in the case of this embodiment, the main body part is comprised by the 1st cylinder part 11, the 2nd cylinder part 21c, and the rectification | straightening part 81. FIG. An attachment screw portion 113 is provided on the upper end side (the negative end side in the y-axis direction) of the first cylindrical portion 11 in the drawing. The attachment screw portion 113 is a female screw for attaching the spout cap BDc to the spout of the spout portion B2. Below the mounting screw portion 113 (in the positive direction in the y-axis direction), the packing 51 is provided in an annular shape along the inner wall of the first cylindrical portion 11. The packing 51 is a close contact member for preventing water leakage when the water outlet cap BDc is attached to the water outlet of the spout portion B2.

  When the attachment screw portion 113 of the first cylinder portion 11 is attached by being screwed with the male screw of the water outlet of the spout portion B 2, the water Wa supplied from the faucet device FC is supplied from the inflow port 111. The water Wa that has entered the first cylindrical portion 11 as the main body portion from the inflow port 111 has an internal flow path (the details will be described later, but the second cylindrical portion 21c, the pressure reducing portion 31c, the upper reduced diameter portion 41c, the lower reduced diameter). Through the portion 74 and the flow passage passing through the rectifying unit 81) and becomes bubble mixed water or rectified water (water substantially free of bubbles) and is discharged from the discharge port 112 to the outside (bowl portion). Water Wb.

  The upper reduced diameter portion 41 c is disposed on the downstream side of the packing 51 (the discharge port 112 side, the positive direction in the y-axis direction). The upper reduced diameter portion 41c includes an annular collar portion 411c that forms an outer periphery in the shape of a hat collar, and an annular convex portion 412c that is surrounded by the collar portion 411c and formed in a region including the center. The collar part 411c is fixed to the decompression part 31c.

  The annular convex portion 412c is formed so as to protrude from the flange portion 411c to the upstream side (the inlet 111 side, the negative direction in the y-axis direction). An inflow hole 413c is formed in a region including the center of the annular convex portion 412c. The water that has entered from the inflow port 111 hits the upper narrowed diameter portion 41c, so that the water pressure is attenuated and flows out from the inflow hole 413c to the downstream side. The water flowing out from the inflow hole 413c to the downstream side flows into a water storage portion 414c formed between the upper throttle portion 41c and the decompression portion 31c.

  The decompression unit 31c is disposed on the downstream side of the upper reduced diameter portion 41c. The decompression unit 31c includes a decompression plate 311c (pressure receiving plate), an upper holding unit 318c, and a lower holding unit 317c. The decompression plate 311c is a circular plate-like member, and is formed of a flexible material such as resin or rubber. The upper holding portion 318c and the lower holding portion 317c are members for sandwiching the decompression plate 311c and the flange portion 411c and fixing them to the second cylindrical portion 21c.

  The decompression plate 311c has a plurality of injection holes 314c (orifice portions) formed in an annular shape. The plurality of injection holes 314c are formed at a position corresponding to the water reservoir 414c. Accordingly, the plurality of injection holes 314c are provided so as not to be blocked by the flange portion 411c of the upper reduced diameter portion 41c.

  A second cylinder portion 21 c is provided outside the upper reduced diameter portion 41 c and the decompression portion 31 c and downstream of the first cylinder portion 11.

  The second cylinder portion 21c is provided with an air hole 211c for introducing air into the internal flow path. The air holes 211c are provided so as to be scattered over the entire circumference of the second cylindrical portion 21c.

  A lower reduced diameter portion 74 is disposed inside and downstream of the second cylindrical portion 21c. The lower reduced diameter portion 74 is a cylindrical member provided with a reduced diameter tapered portion 741 and an enlarged diameter tapered portion 742. The reduced diameter taper portion 741 is provided on the upstream side of the enlarged diameter taper portion 742, and is formed so as to narrow the internal flow path from the upstream side toward the downstream side. The enlarged diameter tapered portion 742 is provided on the downstream side of the reduced diameter tapered portion 741, and is formed so as to widen the internal flow path from the upstream side toward the downstream side.

  The inclined surface 741a that is the inner side surface of the reduced diameter taper portion 741 is formed at a position corresponding to the plurality of injection holes 314c of the decompression portion 31c. Accordingly, the water flow injected from the plurality of injection holes 314c of the decompression plate 311c strikes the inclined surface 741a and is directed inward to enter the gas-liquid interface.

  When water is supplied from the inflow port 111 and water is injected from the plurality of injection holes 314c of the decompression plate 311c, the water accumulates from the downstream side, and a gas-liquid interface is formed at a position corresponding to the lower throttle portion 74. The Since the water flow directed by the inclined surface 741a enters the gas-liquid interface while entraining air, bubble-containing water is generated. Due to the action of the decompression plate 311c, a negative pressure is generated between the decompression plate 311c and the lower throttle part 74, so that air is drawn from the air holes 211c and enters the gas-liquid interface together with water ejected from the plurality of ejection holes 314c. To do. Due to the rush of water flow to the gas-liquid interface, the gas-liquid interface is disturbed and air bubbles are more likely to be mixed. Therefore, the region from the decompression plate 311c to the lower reduced diameter portion 74 is formed as the bubble mixing portion 713.

  The bubble mixed water generated by the bubble mixing unit 713 is rectified by the rectifying grid 811 of the rectifying unit 81 provided on the downstream side, and discharged from the discharge port 112 to the outside.

  In the case of this example, the decompression plate 311c is formed so as to have flexibility, so that when the water flowing in from the inflow port 111 exceeds a predetermined flow rate, the decompression plate 311c is deformed so as to expand downstream. A state in which the decompression plate 311c is deformed is shown in FIG. As shown in FIG. 17, when the water flowing in from the inlet 111 exceeds a predetermined flow rate and the pressure reducing plate 311c is deformed so as to expand downstream, the direction in which the water jetted from the jet hole 314c heads changes. Then, it comes into contact with the upper side of the inclined surface 741a. Accordingly, the distance that water flows through the inclined surface 741a increases, and as a result, the flow rate of water when entering the gas-liquid interface is reduced.

  As described above, when the water flowing in from the inlet 111 exceeds a predetermined flow rate, the increase in the flow velocity of the water entering the gas-liquid interface is suppressed, so that the amount of entrained air is reduced and the deformation of the gas-liquid interface is suppressed. , Mixing efficiency can be suppressed. Thus, mixing efficiency can be easily suppressed with a simple configuration of adjusting the flow velocity.

  The embodiments of the present invention have been described above with reference to specific examples. However, the present invention is not limited to these specific examples. In other words, those specific examples that have been appropriately modified by those skilled in the art are also included in the scope of the present invention as long as they have the characteristics of the present invention. For example, the elements included in each of the specific examples described above and their arrangement, materials, conditions, shapes, sizes, and the like are not limited to those illustrated, but can be changed as appropriate. Moreover, each element with which each embodiment mentioned above is provided can be combined as long as technically possible, and the combination of these is also included in the scope of the present invention as long as it includes the features of the present invention.

FC: faucet device (water discharge device)
B1: Standing portion B2: Spout portion HL: Water discharge handle BC: Water discharge cap (water discharge device)
10: 1st cylinder part (body part)
20: Second cylinder part 30: Decompression part (mixing rate adjustment part, air amount adjustment part)
40: Upper narrowing part (attenuation part)
50: Packing 60: Spring 70: Lower reduced diameter portion 80: Rectification portion 101: Inlet 102: Discharge port 103: Mounting screw portion 104: Engagement protrusion 201: First guide portion 202: Outer protrusion 203: Inner protrusion 204: Air hole (opening)
205: Second guide portion 301: Pressure reducing plate (pressure receiving plate)
302: Upper protrusion 303: Recess 304: Injection hole (orifice portion)
305: Shielding wall (mixing rate adjusting unit, air amount adjusting unit)
401: collar portion 402: annular convex portion 403: inflow hole 404: reservoir portion 701: reduced diameter taber portion 701a: inclined surface 702: enlarged diameter tapered portion 703: bubble mixing portion 801: rectifying grid 802: air flow path 803: Air intake

Claims (9)

A water discharger capable of discharging bubble-containing water,
A discharge port for discharging water, an inflow port for allowing water discharged from the discharge port to flow in from a water supply source, and a main body portion formed with an internal flow path from the inflow port to the discharge port,
An orifice for injecting water flowing in from the inlet toward the downstream side of the internal flow path;
An opening for introducing air is formed in the internal flow path, and the air introduced from the opening is mixed with water jetted from the orifice to form bubble-mixed water and supplied to the discharge port The mixing part;
A mixing rate adjusting unit that adjusts the mixing rate of bubbles mixed in the bubble mixed water in the bubble mixing unit,
The mixing rate adjusting unit increases the mixing rate until the water flowing from the inlet reaches a predetermined flow rate, and suppresses the increase of the mixing rate when the water flowing from the inlet exceeds a predetermined flow rate. A water discharge device characterized by the above.   The mixing rate adjusting unit is configured to suppress an increase in the mixing rate by suppressing an amount of air introduced into the bubble mixing unit when water flowing from the inflow port exceeds a predetermined flow rate. The water discharging apparatus according to claim 1.   When the water flowing in from the inflow port exceeds a predetermined flow rate, the mixing rate adjusting unit suppresses the amount of air introduced by suppressing the force to draw air from the opening to the bubble mixing unit. The water discharge device according to claim 2, wherein A pressure reducing plate provided to block the internal flow path and having a plurality of holes forming the orifice portion;
The bubble mixing part is configured to generate a negative pressure by water sprayed from the plurality of holes, and to draw air from the opening by the action of the negative pressure,
When the water flowing in from the inflow port exceeds a predetermined flow rate, the mixing rate adjusting unit suppresses an increase in a flow rate of water ejected from the plurality of holes, thereby suppressing a force for drawing air from the opening. The water discharging apparatus according to claim 3.   The mixing rate adjusting unit suppresses an increase in a flow rate of water ejected from the plurality of holes by expanding an opening area of the plurality of holes when water flowing from the inlet exceeds a predetermined flow rate. The water discharging apparatus according to claim 4.   When the water flowing in from the inflow port exceeds a predetermined flow rate, the mixing rate adjusting unit ejects from the plurality of holes by forming paths other than the plurality of holes to reach the downstream side of the decompression plate. The water discharging apparatus according to claim 4, wherein an increase in the flow rate of water is suppressed.   The mixing rate adjusting unit suppresses an increase in the mixing rate by suppressing bubble mixing efficiency with respect to water in the bubble mixing unit when the water flowing in from the inlet exceeds a predetermined flow rate. The water discharging apparatus according to claim 1. In the bubble mixing portion, water is temporarily stored between the discharge port and the water jetted from the orifice portion to form a gas-liquid interface, and the water jetted from the orifice portion is the opening. The bubble mixed water is generated by entering the gas-liquid interface while entraining the air introduced from the section,
The said mixing rate adjustment part suppresses the said mixing efficiency by suppressing the flow rate increase of the water which rushes into the said gas-liquid interface, when the water which flows in from the said inflow port exceeds predetermined flow volume. The water discharging apparatus according to 7. In the bubble mixing portion, water is temporarily stored between the discharge port and the water jetted from the orifice portion to form a gas-liquid interface, and the water jetted from the orifice portion is the opening. The bubble mixed water is generated by entering the gas-liquid interface while entraining the air introduced from the section,
When the water flowing in from the inlet exceeds a predetermined flow rate, the mixing rate adjusting unit reduces the total extension length in which the outer periphery of the water flow entering the gas-liquid interface contacts the gas-liquid interface, thereby reducing the mixing efficiency. The water discharging device according to claim 7, wherein the water discharging device is suppressed.