JP2008136931A - Liquid discharge apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid discharge apparatus which can easily cause activation action by fine bubbles by generating the fine bubbles efficiently and highly densely. <P>SOLUTION: This liquid discharge apparatus 10 comprises a liquid flow storage part 11B with a ring-like cross section formed in the rear part to which a liquid flow is introduced from a liquid introduction port 11c and an outer aperture 13a communicated with the outside, a gas flow introduction channel 13A penetrating the inside of the liquid flow storage part from the rear side to the front side and having an inner aperture 13b facing forward in the front part of the liquid flow storage part, an eddy current formation channel 13A communicated with the liquid flow storage part, extended forward to the surrounding of the gas flow introduction channel while the diameter is reduced more than that of the liquid flow storage part and having a ring-like cross-section up to the inner aperture of the gas flow introduction part and a circular cross-section form the portion facing to the inner aperture, and a liquid discharge port 16a formed in the most front part and communicated with the eddy current formation channel. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a liquid discharge device, and more particularly, to a water discharge structure of a liquid discharge device configured to be able to discharge a foam flow.

  In general, a liquid discharge device configured to be able to discharge a foam flow into the atmosphere is known, and such a liquid discharge device is, for example, a shower head used in a bathroom or the like, a faucet attached to a faucet, It is used as a cleaning instrument attached to the tip of a hose.

  In order to discharge the foam flow, for example, the liquid discharge device described above sucks air from the intake port adjacent to the discharge port while ejecting the water flow from the rear toward the front discharge port, and the air flows into the water flow. It is known that a foam flow is generated by entraining. (For example, see Patent Documents 1 to 3 below). There is also known a shower head in which an air intake is opened on the back side of the head and air is introduced from behind a switching valve provided therein to generate a foam flow (for example, the following patent documents) 4). Furthermore, a sleeve that engages with the front main body via a spline and is screwed with a rear switching handle is provided, and a swirl flow is formed by a swirl flow chamber provided in the sleeve, and this swirl flow is formed into the sleeve. Sprinkling holes provided around the concentrated water discharge holes by injecting the air drawn from the concentrated water discharge holes for discharging the rectification provided at the center of the front end while spraying so as to spread in a conical shape toward the front of the There has also been proposed a shower head configured to discharge more foam flow (see, for example, Patent Document 5 below).

  However, in the liquid ejecting apparatus described in the above-mentioned conventional document, although the cleaning effect can be somewhat enhanced by the foam flow, for example, the bubble diameter (the equivalent spherical diameter of bubbles, the same applies hereinafter) is 50 μm or less (preferably 10 μm or less). ) Cannot be formed, and the bubble diameter increases and the bubble density decreases as the distance from the discharge port increases, so that a sufficient cleaning effect is obtained. There is a problem that it is difficult.

On the other hand, as a structure for generating fine bubbles, various nozzle structures configured so that air bubbles are sheared by introducing air into a swirling flow to generate fine bubbles include fine bubbles in water such as a bathtub. It has been proposed for the purpose of ejecting a water flow (see, for example, Patent Documents 6 to 9 below). In particular, as shown in Patent Document 9, as a suction washer that enhances the skin cleaning effect using the above principle, while generating a swirling flow by introducing a water flow into the apparatus from the side, The negative pressure generated by this swirling flow causes air to be self-sucked from the gas self-suction port on the back, and a foam flow containing fine bubbles is generated and applied to the skin in the expanded gas-liquid jet guide provided at the tip of the device. What can be done is known. Such an apparatus is based on the apparatus structure which generate | occur | produces a microbubble in water described also in the nonpatent literature 1, for example. In addition, by introducing air while forming a swirling flow with turbine blades arranged in water, and by providing a nozzle that expands the diameter after reducing the diameter by reducing the inner diameter, the diameter of the tip that has passed through the small diameter portion There is also known a method of generating fine bubbles by causing vortex breakdown (a phenomenon in which the structure of the vortex changes abruptly) in a portion (see Non-Patent Document 2 below).
International publication pamphlet WO2003 / 040481 JP-A-2005-290686 Japanese Utility Model Publication No. 51-134 Utility Model Registration Gazette No. 2590832 JP-A-4-306331 JP 2003-181258 A JP 2003-225546 A JP 2006-142300 A JP 2003-38382 A Written by Hirofumi Taisei, “All About Micro Bubbles”, Nippon Jitsugyo Publishing Co., Ltd., October 20, 2006, p. 144-164 Tosatsu Kyoto (Graduate School of Systems and Information Engineering, University of Tsukuba), “Airfoil bubble generator using vortex breakdown”, [online], [searched on November 24, 2006], Internet <http: // surface. kz.tsukuba.ac.jp/~kyotoh/MicroBubbleHome.pdf>

  However, in the devices described in Patent Documents 6 to 9 and Non-Patent Documents 1 and 2, after forming a swirling flow in water, air is introduced into the center of the flow to generate fine bubbles, which are When the foam flow is jetted into the atmosphere, it cannot be applied as it is. This is because, in the above device, a large amount of fine bubbles are generated when the swirling flow is discharged from the nozzle into the water. Therefore, when a foam flow containing fine bubbles is ejected into the atmosphere, the generation of fine bubbles is generated. This is because the efficiency is very low and fine bubbles with sufficiently small diameter and high density cannot be generated. For example, in the apparatus described in Non-Patent Document 2, a vortex flows in water up to the small diameter portion, but since the water flow is released into the atmosphere at the expanded diameter portion that follows, the It is difficult to cause vortex breakdown as in water. It is also predicted that when a water flow is discharged into the atmosphere, the fine bubbles disappear within a very short time by entraining the atmosphere, and the desired action cannot be obtained.

  Therefore, the present invention solves the above-mentioned problems, and the problem is to generate fine bubbles efficiently and with high density. As a result, a foam flow containing fine bubbles is released into the atmosphere. Another object of the present invention is to realize a liquid ejection device that can easily enjoy the activation effect of fine bubbles, such as being able to maintain a certain amount of fine bubbles.

  In view of such a situation, the liquid ejection device of the present invention includes a liquid flow accommodating portion having an annular cross section provided at a rear portion where a liquid flow is introduced from a liquid introduction port, and an external opening communicating with the outside. An air flow introduction path that penetrates the inside of the housing portion from the rear to the front and has an internal opening facing forward in front of the liquid flow housing portion, and communicates with the liquid flow housing portion and is smaller than the liquid flow housing portion. An eddy current forming path having a circular cross section from a portion facing the internal opening, and having an annular cross section extending around the air flow introduction path to the front and reaching the internal opening of the air flow introduction path; And a liquid discharge port provided in the foremost part in communication with the vortex forming path.

  According to the present invention, a process in which a liquid flow is introduced from the liquid introduction port and is stored in the liquid flow storage portion having the annular cross section to generate a swirling flow, and then proceeds to the vortex forming path having a further reduced diameter in the circular cross section. The swirl flow velocity and swirl frequency are increased at this time, and air flow is introduced from the internal opening of the air flow introduction path into this high-speed swirl flow. After that, fine bubbles are gradually generated by the shearing action of the airflow by the swirling flow. Then, the vortex generated in the vortex forming path is destabilized and collapsed while being discharged from the vortex forming path to the liquid discharge port, and a foam flow in which fine bubbles of sufficiently small diameter and high density are mixed is formed. The In the case of the present invention, a high-speed swirling flow is generated by proceeding from the large-diameter liquid flow accommodating portion to the small-diameter vortex forming passage, and an air flow is generated only at the center of the vortex forming passage where the high-speed swirling flow is formed. By being introduced, the vortex is formed in a stable state in the circular section ahead of it, so that the miniaturization of the bubbles proceeds efficiently and exits from the vortex formation path to the atmosphere through the liquid discharge port. Since the vortex breaks up rapidly in the process of jetting, the bubbles become even finer, making it easier to maintain the bubbles even when they are released into the atmosphere, resulting in a higher activation effect than conventional foam flows. (Cleaning action, bioactive action, etc.) can be easily obtained.

  Note that the swirling flow in the liquid flow accommodating portion is sufficiently generated basically only by introducing the liquid flow into the liquid flow accommodating portion having an annular cross section. By setting the introduction direction obliquely in the tangential direction on the outer peripheral side of the annular cross-sectional shape as in the embodiment described later, it can be generated more efficiently. Further, it is preferable that the inlet side portion of the vortex forming portion is tapered and the outlet side portion is configured to have the same diameter in order to achieve both high speed swirling flow and stabilization of the vortex flow.

  In the present invention, a liquid discharge chamber that communicates with the vortex formation path, has a diameter larger than the vortex formation path in front of the vortex formation path, and communicates with the liquid discharge port, and faces the liquid discharge chamber It is preferable that a liquid flow scattering unit that is disposed to face the outlet of the vortex forming path and that scatters the liquid flow derived from the vortex forming path to the surroundings in the liquid discharge chamber is further provided. According to this, the swirl flow derived from the swirl flow path is discharged into the large-diameter liquid discharge chamber, resulting in instability of the swirl flow and sudden vortex collapse, and the swirl flow Since the vortex breakdown is promoted by being scattered by the surroundings, it is possible to further reduce the diameter and formation density of the fine bubbles in the foam flow discharged from the liquid discharge port. Maintenance performance can be further enhanced.

  In the present invention, it is preferable that liquid flow swirling means for swirling the liquid flow is provided in the liquid flow accommodating portion or the vortex flow forming path located upstream of the internal opening in the vortex flow forming path. . According to this, the flow velocity and the swirling frequency of the swirling flow can be increased by the liquid swirling means, but the bubble diameter is proportional to approximately the sixth power of the swirling frequency at the time of vortex breakdown (Non-Patent Document 2 above). Therefore, the bubble diameter can be further reduced by increasing the turning frequency. Examples of the liquid flow swirling means include a liquid flow guiding structure itself such as fins (turbine blades) and spiral grooves arranged in the flow path for swirling the liquid flow, or a member having the structure. In addition to the liquid flow guide structure, the liquid flow swirl means may be capable of supplying swirl energy separately, for example, a turbine connected to a rotational drive source.

  In the present invention, it is preferable that the liquid flow swirl means supports a pipe material constituting the air flow introduction path in the vortex flow formation path. Although the pipe material which comprises the said airflow introduction path is arrange | positioned in a vortex | eddy_current formation path, there exists a possibility that a vibration may generate | occur | produce in the said pipe material when a high-speed swirl flow flows through the circumference | surroundings. However, by supporting the tube material in the vortex forming path via the liquid flow swirl means, the substantial rigidity of the tube material can be increased, and vibration of the tube material can be prevented. Examples of the liquid flow swirl means that can support the pipe material include a liquid flow guide structure having a continuous structure part from the outer peripheral surface of the pipe material to the inner peripheral surface of the vortex forming path, or a member having the structure. .

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic longitudinal sectional view showing a liquid ejection apparatus according to a first embodiment of the present invention. The liquid discharge device (shower head) 10 includes a liquid introduction part 11a having a liquid introduction path 11A for introducing a liquid such as water and hot water, and a liquid flow storage part 11B connected to the liquid introduction part 11a. The rear case portion 11b is configured, and the inside of the liquid introduction portion 11a and the rear case portion 11b communicate with each other through the liquid introduction port 11c and are configured to have an opening portion 11d at the center of the back surface. A case 11 that covers the internal structure from the rear is provided. A tube support member 12 screwed into the case 11 is fitted and disposed in the opening 11d of the case 11, and an airflow introduction tube 13 extending in the direction of the axis 10x is fixed to the tube support member 12. The air flow introduction tube 13 has an external opening 13a communicating with the outside, extends in the direction of the axis 10x in the case 11, and has an internal opening 13b at the tip thereof. Here, by changing the screwing depth of the tube support member 12 with respect to the case 11, the position along the axis 10x of the internal opening 13b can be adjusted back and forth.

  Inside the case 11, an inner member 14 having a cylindrical portion 14a along the axis 10x and a flange portion 14b projecting in a flange shape from the outer periphery of the rear end of the cylindrical portion 14a is disposed at the center. . As for this inner member 14, the outer periphery of the flange part 14b is closely_contact | adhered to the inner surface of case 11 via sealing members, such as packing. Further, a fixing member 15 configured in a ring shape having an L-shaped cross section is disposed in front of the inner member 14. The fixing member 15 contacts the inner member 14 from the front, and holds and fixes the inner member 14 to the case 11.

  A discharge member 16 having one or a plurality of liquid discharge ports 16a is disposed in front of the case 11, and the discharge member 16 is held by a holding frame 17 that is screwed to the front end portion of the case 11, and a seal such as packing. The case 11 and the fixing member 15 are in close contact with each other through the members. The fixing member 15 holds the inner member 14 with a pressing force received from the discharge member 16. On the central inner surface side of the discharge member 16, a liquid flow scattering portion 18 that is formed integrally with the discharge member 16 or is configured separately and fixed by bonding or the like is provided. The liquid flow scattering portion 18 is provided with a conical liquid flow scattering surface 18a that faces the outlet 14d of the cylindrical portion 14a of the inner member 14 and is tapered around the axis 10x. In addition, you may comprise the discharge member 16 and the holding frame 17 integrally.

  In the liquid discharge device 10 configured as described above, a liquid introduction path 11A is formed inside the liquid introduction portion 11a of the case 11, and the liquid introduction path 11A communicates with the liquid introduction port 11c. The liquid inlet 11c is open to a liquid flow accommodating portion 11B formed inside the rear case portion 11b of the case 11. The liquid inlet 11c is opened obliquely from the outer peripheral side toward the direction around the axis 10x with respect to the liquid flow accommodating portion 11B, thereby making it easy to generate a swirling flow in the liquid flow accommodating portion 11B. . The liquid flow accommodating portion 11B has an annular cross section as a whole because the tube support member 12 and the air flow introduction tube 13 penetrate along the axis 10x.

  Inside the airflow introduction pipe 13 forms an airflow introduction path 13A for introducing the airflow from the outside (the back of the case 11). This air flow introduction path 13A is a straight path extending from the external opening 13a to the internal opening 13b. The cylindrical portion 14a of the inner member 14 constitutes a vortex forming path 14A. This vortex forming path 14A has a smaller diameter than the liquid flow accommodating portion 11B, and the inlet 14c opens to the liquid flow accommodating portion 11B. In this case, it is preferable that the inner diameter of the vortex forming path 14A is gradually reduced from the inlet 14c toward the front.

  Further, the air flow introduction pipe 13 is introduced along the axis 10x into the vortex forming path 14A, and the internal opening 13b is opened in the middle. That is, the inlet side portion of the vortex forming path 14A has an annular cross section due to the presence of the air flow introduction pipe 13, and the outlet side portion has a circular cross section due to the absence of the air flow introduction pipe 13. In the case of the illustrated example, the vortex forming path 14A is configured to be tapered so that the diameter gradually decreases from the inlet 14c, and is configured to have substantially the same diameter on the way to the outlet 14d. The tapered portion substantially corresponds to the inlet side portion, and the same diameter portion substantially corresponds to the outlet side portion. In this manner, it is preferable that the inlet side portion of the vortex forming path is formed in a tapered shape and the outlet side portion is formed in the same diameter in order to achieve both a high speed swirling flow and a stable vortex flow. The position along the axis 10x of the internal opening 13b can be adjusted as described above, and this adjustment changes the position where the air flow in the vortex forming path 14A is introduced. It becomes possible to set to.

  The outlet 14d of the vortex forming path 14A opens to the liquid discharge chamber 16A surrounded by the fixing member 15 and the discharge member 16. The liquid discharge chamber 16A has a cross section whose diameter is larger than that of the vortex forming path 14A, and communicates with the outside through a liquid discharge port 16a provided in the discharge member 16. In the liquid discharge chamber 16A, the outlet 14d of the vortex forming path 14A is disposed to face the liquid flow scattering surface 18a of the liquid flow scattering portion 18. A plurality of liquid discharge ports 16A are formed in a dispersed manner on the outer peripheral side of the liquid flow scattering surface 18a.

  In the liquid ejection device 10 of the first embodiment configured as described above, the liquid is introduced from the liquid introduction path 11A through the liquid introduction port 11c into the liquid flow accommodating portion 11B, and in the liquid flow accommodating portion 11B having an annular cross section. A swirling flow is generated. The swirling flow in the liquid flow accommodating portion 11B is introduced into the vortex forming path 14A from the inlet 14c, and the flow velocity and the swirling frequency are increased by being introduced into the small-diameter vortex forming path. Here, as shown in FIG. 2, the air current is sucked into the swirl flow X through the air flow introduction path 13 </ b> A by the pressure reducing action caused by the liquid swirl flow X passing through the inner opening 13 b. Y is introduced. Since the high-speed swirling flow X generates a decompression region in the central portion along the axis 10x due to centrifugal force, the airflow Y initially becomes an air columnar shape along the axis 10x and gradually flows while flowing inside the swirling flow X. It is separated by the shearing force of and generates fine bubbles. In this way, the vortex flow Z formed by the airflow Y and the surrounding fine bubbles is formed in the swirl flow X in the vortex flow formation path 14A. The vortex Z is in a relatively stable state due to the high-speed swirl flow X in the small-diameter vortex formation path 14A, and initially flows through the center of the swirl flow X along the axis 10x and is sheared by the swirl flow X. Although fine bubbles are gradually formed, vortex collapse occurs due to the destabilization of the swirl flow X from the vicinity of the outlet 14d of the vortex forming path 14A to the liquid discharge chamber 16A. The airflow in the vortex Z ′ destabilized by this vortex breakdown is rapidly refined, and small diameter and high density microbubbles are formed.

  The swirling flow X exiting into the liquid discharge chamber 16A collides with the liquid flow scattering surface 18a together with the vortex Z ', where the vortex Z' is completely destroyed and further fine bubbles are formed. In this way, the foam flow formed in the liquid discharge chamber 16A is discharged to the outside from the liquid discharge port 16a while the fine bubbles having a small diameter (50 μm or less, preferably 10 μm or less) are contained in the water. .

  In the present embodiment, the swirling flow generated in the liquid flow accommodating portion 11B becomes a high-speed swirling flow X in the reduced-diameter small-eddy vortex forming path 14A, and an air flow is introduced into the swirling flow X from the internal opening 13b. Since the vortex flows Z and Z ′ are formed here, a stable vortex flow Z can be formed, and vortex collapse occurs thereafter, so that further reduction in the diameter and density of the fine bubbles is further promoted. . Therefore, since fine bubbles having a smaller diameter are included in a higher density than the foam flow discharged from a conventional shower head or the like, the fine bubbles are not easily lost even after being discharged from the liquid discharge port 16a, and thus are in the atmosphere. Even in the released foam flow, the fine bubbles are maintained longer than before, so that it is possible to achieve a sufficient activation action, for example, a washing action, a blood flow increasing action, and the like.

  FIG. 3 is a longitudinal sectional view showing the structure of the liquid ejection device 20 according to the second embodiment in which the details are improved while following the basic configuration of the first embodiment. The liquid ejection device 20 according to the second embodiment includes a liquid introduction part 21a and a rear case part 21b, and a case 21 including therein a liquid introduction path 21A, a liquid introduction port 21c, and a liquid flow accommodating part 21B. The tube support member 22 attached to the opening 21d of the case 21, the air support pipe 23 provided with the external opening 23a, the air flow introduction path 23A and the internal opening 23b, the cylindrical portion 24a, An inner member 24 constituting a vortex forming path 24A having a flange portion 24b and having a cylindrical portion 24a provided with an inlet 24c and an outlet 24d, a fixing member 25 for fixing the inner member 24, and a discharge provided with a liquid discharge hole 26a A member 26, a holding frame 27 for holding the discharge member 26, and a liquid flow scattering portion 28 having a liquid flow scattering surface 28a are provided, all of which are basically the same except as described below. Since 1 is the same as the embodiment, the description thereof is omitted for the same point. Note that the discharge member 26 and the holding frame 27 may be configured integrally.

  In the present embodiment, a recessed hole 22a is provided in the rear portion of the tube support member 22, and an external opening 23a of the airflow introduction tube 23 is opened inside the recessed hole 22a. An airflow adjusting screw 29 is screwed into the concave hole 22a, and the adjusting end 29a provided at the tip of the airflow adjusting screw 29 can adjust the amount of airflow introduced by increasing or decreasing the opening area of the airflow suction port 23a. It is like that. Specifically, the adjustment end 29a has a conical shape, and the airflow passage area increases or decreases depending on the insertion depth of the tip end into the external opening 23a. The through hole 29b provided in the airflow adjusting screw 29 constitutes an airflow inlet.

  Further, a liquid flow swirl member 31 that is a liquid flow swirl means is disposed in the vortex forming path 24A configured in the cylindrical portion 24a of the inner member 24, and is held and fixed by a holding member 32 attached by a bayonet structure or the like. Has been. The liquid flow swirling member 31 has a spiral groove 31a that spirally guides the liquid flow that flows in from the upstream side. The liquid flow is guided by the spiral groove 31a and swirls along the spiral groove 31a. To do.

  As the liquid flow swirling means, a liquid flow swirling member 31 'shown in FIG. 4 having a turbine-shaped fin 31a' may be used. Since the liquid flow swirling member 31 ′ has a continuous structural portion from the outer peripheral surface of the air flow introduction tube 23 to the inner peripheral surface of the cylindrical portion 24 a, The air flow introduction pipe 23 is supported from the outside. As a result, vibrations can be prevented from occurring in the airflow introduction tube 23, and the possibility that the airflow introduction tube 23 is damaged when subjected to an impact can be reduced.

  In this embodiment, the liquid flow swirl member 31 increases the flow velocity and swirl frequency of the swirl flow introduced into the vortex flow formation path 24A. Further, the vortex forming path 24A can be further reduced in diameter at the portion exiting from the liquid flow swirl member 31, and the flow velocity and swirl frequency of the swirl flow can be further increased. As a result, the air flow derived from the internal opening 23b of the air flow introduction path 23A flows into the central portion of the swirling flow faster than in the first embodiment, so that the generation efficiency of fine bubbles can be further increased.

  FIG. 5 is a longitudinal sectional view showing another discharge member 36 that can be exchanged and attached to the liquid discharge devices 10 and 20 of the first embodiment or the second embodiment, and an extension adapter 37 that can be additionally attached. . The discharge member 36 is basically configured to be held and fixed by the holding frames 17 and 27 with respect to the cases 11 and 21 of the above-described embodiments. A cylindrical portion 36a is formed in close contact with the front ends of the cylindrical portions 14a and 24a of the inner members 14 and 24, and the discharge port 36b of the cylindrical portion 36a is opened to the outside. The outlets 14d and 24d of 24A are configured to directly communicate with the outside through the cylindrical portion 36a.

  By using this discharge member 36 in each of the above-described embodiments, the swirl flow and vortex flow in the vortex forming paths 14A and 24A are discharged to the outside as they are, and vortex collapse occurs during discharge, thereby generating fine bubbles. In this structure, when the bubble flow is discharged into the atmosphere, the fine bubbles disappear in a relatively short time by entraining the atmosphere. Nevertheless, the vortex formation paths 14A and 24A and the internal openings of the air flow introduction pipes 13 and 23 are still present. By the positional relationship with 13b and 23b, it is possible to exhibit the effect | action by a fine bubble more effectively than before.

  An extension adapter 37 shown in FIG. 5 is used for holding and fixing the discharge members 16, 26, and 36 to the cases 11 and 21 instead of the holding frames 17 and 27 of the above embodiments. By attaching the extension adapter 37 to the cases 11 and 21, the front end of the extension adapter 37 can be brought into contact with the object, thereby fixing the distance between the discharge members 16, 26, and 36 and the object. Therefore, the foam flow discharged from the discharge members 16, 26, and 36 can be reliably applied to the object at a predetermined distance.

  FIG. 6 is a longitudinal cross-sectional view of a third embodiment that is based on the configuration of the first embodiment and is configured so that the foam flow and the rectification can be switched and discharged with respect to the configuration. The liquid discharge device 40 of this embodiment has a liquid introduction part 41a and a rear case part 41b that are basically the same as those of the first embodiment, and a liquid introduction path 41A and a liquid introduction port 41c are provided therein. And a case 41 having a liquid flow accommodating portion 41B, a tube support member 42 attached to the opening 41d of the case 41, a support member fixed to the tube support member 42, and an external opening 43a, an air flow introduction path 43A, and an internal opening 43b. An inner member 44 having an air flow introduction pipe 43, a cylindrical portion 44a and a flange portion 44b, and an eddy current forming path 44A provided with an inlet 44c and an outlet 44d by the cylindrical portion 44a, and a fixing member for fixing the inner member 45, a discharge member 46 having a liquid discharge hole 46a, a holding frame 47 for holding the discharge member 46, and a liquid flow scattering portion 48 having a liquid flow scattering surface 48a. Because basically, except as described below is the same as the first embodiment, the description thereof is omitted for the same point. Note that the discharge member 46 and the holding frame 47 may be configured integrally.

  In the present embodiment, the airflow introduction pipe 43 is configured integrally with the pipe support member 42 to form an airflow introduction member, and a support member 49A provided with an airflow introduction passage 49a is fitted in the opening of the rear part thereof, and this support is provided. An airflow adjusting screw 49B is screwed into the member 49A. The air flow adjusting screw 49B is provided with an adjustment end 49b similar to the above, and is configured so that the amount of air flow introduced can be adjusted according to the screwing depth. Such a configuration can be similarly applied to the above embodiments.

  The inner member 44 is guided by the guide portion 45A of the fixed member 45 so as to be movable along the axis 40x. Here, the guide portion 45A has a fitting hole 45h drilled along the axis 40x so as to be fitted with a convex portion 44p projecting along the axis 40x of the inner member 44, and the inner member 44 is moved along the axis. The inner member 44 is configured not to rotate around the axis 40x while being configured to be movable along 40x. The inner member 44 is screwed to the driving portion 45B of the fixing member 45 through a screw structure formed around the axis 40x. Furthermore, the drive unit 45B is fixed and integrated with the discharge member 46 and the holding frame 47, and is attached to the case 41 and the guide unit 45B so as to be rotatable about the axis 40x.

  When the holding frame 47 is rotated with respect to the case 41, the integrally attached drive unit 45A rotates together, so that the inner member 44 moves along the axis 40x. Specifically, the inner member 44 is driven by the screw structure of the drive unit 45B and guided by the guide unit 45A, so that a front end position indicated by a solid line in the drawing and a rear end position indicated by a two-dot chain line in the drawing are provided. Move between. Here, when the inner member 44 is at the position indicated by the solid line in the drawing, a foam flow containing fine bubbles is discharged from the liquid discharge port 46a in the same process as in the first embodiment. On the other hand, when the inner member 44 is at the position of the two-dot chain line in the figure, the flow of the liquid flow from the liquid flow accommodating portion 41B to the vortex forming path 41A is interrupted, and instead, provided around the inner member 44. As a whole, the liquid flow passes through the liquid flow passage 45S having an annular cross section to reach the liquid discharge chamber 46A, and finally the rectification is discharged from the liquid discharge port 46a.

  In the above configuration, the inner member 44 moves back and forth along the axis 40x, thereby forming a foam flow that travels from the liquid flow accommodating portion 41A to the liquid discharge chamber 46A via the vortex flow formation path 44A, It is possible to switch the path that forms the rectification that proceeds from the liquid flow accommodating portion 41A to the liquid discharge chamber 46A via the liquid flow passage 45S. In this case, even if the holding frame 47 is rotated around the axis 40x, only the position of the inner member 44 along the axis 40x changes, and there is no change in other configurations. Stable discharge performance can be set without changing the characteristics. In addition, although said 3rd Embodiment becomes a structure which added the switching function of foam flow and rectification to 1st Embodiment, it is good also as a structure which added the said switching function to 2nd Embodiment.

  The liquid ejection device 10 of the first embodiment was configured as a shower head, and the cleaning performance was compared with the foam flow of a normal shower head. With each shower head, the surface of the skin of the same person after applying oil-based ink, the part where lipstick was applied, and the surface of the scalp after applying foam flow at the same temperature to the predetermined part of the scalp for the same time A magnified image of 50 times was taken and observed with a scope. When the shower head of this embodiment is used, all of the oil-based ink, lipstick, and sebum are significantly removed compared to the case of using a normal shower head. The residue of ink, lipstick, and sebum was clearly recognized, but when the shower head of the embodiment was used, the residue was slightly visible in the enlarged image, but was hardly visible with the naked eye.

  In addition, the liquid discharge apparatus of the present invention is not limited to the illustrated examples described above, and it is needless to say that various changes can be made without departing from the gist of the present invention.

FIG. 3 is a longitudinal sectional view of the liquid ejection device according to the first embodiment. Explanatory drawing which shows typically the generation | occurrence | production of vortex | eddy_current of a liquid discharge apparatus, and the process of vortex breakdown. The longitudinal cross-sectional view of the liquid discharge apparatus of 2nd Embodiment. The perspective view of the different liquid flow turning member of 2nd Embodiment. The longitudinal cross-sectional view which shows the different discharge member and extension adapter which can be used in each embodiment. The longitudinal cross-sectional view of the liquid discharge apparatus of 3rd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10, 20, 40 ... Liquid discharge apparatus 11, 21, 41 ... Case, 11a, 21a, 41a ... Liquid introduction part, 11b, 21b, 41b ... Rear side case part, 11c, 21c, 41c ... Liquid introduction port, 11B , 21B, 41B ... Liquid flow accommodating portion, 12, 22, 42 ... pipe support member, 13, 23, 43 ... Air flow introduction pipe, 13b, 23b, 43b ... Internal opening, 14, 24, 44 ... Inner member, 14A, 24A, 44A ... Eddy current forming path, 15, 25, 45 ... Fixing member, 45A ... Guide part, 45B ... Drive part, 16, 26, 36, 46 ... Discharge member, 17, 27, 47 ... Holding frame, 18, 28 48 ... Liquid splash part, 18a, 28a, 48a ... Liquid splash surface, 19, 29, 49B ... Air flow adjusting screw, 37 ... Extension adapter

Claims (4)

A liquid flow accommodating portion having an annular cross section provided at the rear portion where the liquid flow is introduced from the liquid introduction port;
An air flow introduction path provided with an external opening communicating with the outside, penetrating the inside of the liquid flow accommodating portion from the rear to the front, and having an internal opening directed forward in front of the liquid flow accommodating portion;
Communicating with the liquid flow storage section and being reduced in diameter from the liquid flow storage section, extending forward around the air flow introduction path, and having an annular cross section until reaching the internal opening of the air flow introduction path, A vortex flow path having a circular cross section from the portion facing the internal opening;
A liquid discharge port that communicates with the vortex formation path and is provided at the forefront;
A liquid ejection apparatus comprising:   A liquid discharge chamber that communicates with the liquid discharge port and communicates with the liquid discharge port and has a spread that is larger in diameter than the vortex flow formation path in front of the vortex flow formation path. 2. The liquid according to claim 1, further comprising a liquid flow scattering portion that is disposed to face an outlet of the path and that scatters the liquid flow led out from the vortex forming path to the surroundings in the liquid discharge chamber. Discharge device.   The liquid flow swirling means for swirling the liquid flow is provided in the liquid flow accommodating portion or the vortex flow forming path located upstream of the internal opening in the vortex flow forming path. 3. The liquid ejection device according to 1 or 2.   The liquid discharge device according to claim 3, wherein the liquid flow swirl means supports a pipe constituting the air flow introduction path in the vortex flow formation path.

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