Microbubble generating mechanism for cleaning objects sprayed

Abstract

To provide a fine bubbles generating mechanism for washing an injection object that is capable of increasing a flow rate and a flow quantity of liquefied fluid including fine bubbles while a having simple structure.SOLUTION: A shower device as a fine bubbles generating mechanism for washing an injection object includes a body part 70A having a flow path inside. The flow path is provided with: a center flow passage part 75; a plurality of guide flow passage parts 77A, 77B in the center flow passage part 75; and a plurality of swirl flow forming parts 78A, 78B following ends on a downstream side of the guide flow passage parts 77A, 77B, respectively. When flowing water introduced into the center flow passage part 75 or an outer periphery flow passage part 80 enters the swirl flow forming parts 78A, 78B via the guide flow passage parts 77A, 77B, it becomes swirl flow while flowing to downstream in the swirl flow forming parts 78A, 78B and is jetted from jet opening parts 82A, 82B with microbubbles included, and swirl flows jetted from adjacent jet opening parts 82A, 82B interfere with each other.SELECTED DRAWING: Figure 12

Description

[Technical field]

[0001] The present invention relates to a fine-bubble generating mechanism for cleaning a target, which sprays a liquid fluid containing fine bubbles such as microbubbles toward a target in the air. [Background technology]

[0002] Conventionally, a mechanism using a swirling flow method has been known as a mechanism for spraying running water containing fine bubbles such as microbubbles (see, for example, Patent Document 1). The present inventor has also provided a fine bubble generating mechanism for cleaning a spray target that has a compact structure but generates a large amount of microbubbles to provide a high cleaning effect (see Patent Document 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2008-023435 A [Patent Document 2] Patent No. 6936357 Summary of the Invention [Problem to be solved by the invention]

[0004] However, while there is a demand for an even more compact overall structure, there is also a demand for an increase in the amount of fine bubbles such as microbubbles, and an increase in the amount and strength of the water flow.

[0005] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a micro-bubble generating mechanism for cleaning a target, which has a simple structure and allows for greater freedom in design. [Means for solving the problem]

[0006] The present invention provides a micro-bubble generating mechanism for cleaning a target, in which a liquid fluid containing micro-bubbles is sprayed into the air along a predetermined spray direction, and the liquid fluid is shot at a target in the air, the mechanism comprising a single main body having a flow path formed therein, the flow path being configured as a main central axis that is an axis determined along the spray direction, and an empty chamber having a cross section that includes a circle centered on the main central axis, the flow path being configured as a concave central flow path portion through which the liquid fluid flows from the outside of the main body along the main central axis, and a side peripheral wall formed around the main central axis of the central flow path portion. a plurality of first guide passage sections connected to a downstream end of the first guide passage section and continuous with the central passage section, the plurality of first swirl flow forming sections being radially arranged around the main central axis; and a plurality of first swirl flow forming sections each continuous with a downstream end of the first guide passage section and formed of a passage section including a tapered portion whose inner diameter decreases as it goes downstream with the ejection direction being the flow direction, the plurality of first swirl flow forming sections being arranged circumferentially around the central passage section around the main central axis within the single main body section, and a downstream end of each of the first swirl flow forming sections having an opening extending to the outside of the main body section and a downstream end of each of the first swirl flow forming sections being connected to a downstream end of the first guide passage section and continuous with the downstream end of the first swirl flow forming section. a first ejection opening portion formed in the central flow passage portion and arranged in a one-to-one correspondence with the first swirling flow forming portion, and a plurality of the first ejection opening portions are arranged in the single main body portion; when the liquid fluid introduced into the central flow passage portion flows into the first swirling flow forming portion via the first guide flow passage portion, the liquid fluid becomes a swirling flow while flowing toward the first ejection opening portion in the first swirling flow forming portion, and is ejected from the first ejection opening portion in a state containing fine bubbles; and the swirling flows ejected into the air from the first ejection opening portions adjacent to each other are mutually spaced apart by the first ejection opening portion. The liquid fluid flows through the first swirl flow forming section and interferes with the liquid fluid in the air downstream thereof, and the swirl direction of the swirl flow of the liquid fluid flowing through the first swirl flow forming section is made the same in all of the first swirl flow forming sections and is projected onto the target to clean the target in the air, and the single main body is a lower member, and the device further comprises an upper member which is superimposed on an upper surface which is the upstream surface of the lower member and fastened to the lower member, and an introduction section through which the liquid fluid is introduced is provided at the center of the upper surface which is the upstream surface of the upper member, and at the center of the upper member,A round hole-shaped upper member side flow passage portion communicating with the introduction portion is provided in a penetrating manner, and the lower member is provided with the central flow passage portion, the plurality of first guide flow passage portions, and the first swirl flow forming portion so as to be exposed on the upper surface of the lower member, and the upper member side flow passage portion and the central flow passage portion communicate with each other in a state where the upper member and the lower member are overlapped, and the first guide flow passage portions and the first swirl flow forming portions are covered by the lower surface which is the downstream surface of the upper member, and the downstream surface of the lower member is covered by the lower surface which is the downstream surface of the lower member. the first guide flow passage portions are arranged radially around the main central axis at equal intervals and independent of one another, and the first ejection openings are arranged along a circumferential direction of a first imaginary circle having a predetermined first radius and centered on the main central axis on the underside of the lower member; and the outer housing further includes an outer casing, in which the main body portion is arranged, the underside of the lower member at the main body portion is exposed at a tip portion of the outer housing, and the side peripheral surface of the lower member and the Between the inner circumferential surface of the outer casing, an outer circumferential flow passage portion is formed through which a part of the liquid fluid introduced from outside the main body portion can flow, and the flow passage further includes a plurality of second guide flow passage portions formed in the lower member at equal intervals and independently of each other radially around the main central axis so that an upstream end of the flow passage portion is continuous with the outer circumferential flow passage portion, and a plurality of second swirling flow forming portions each including a passage portion including a tapered portion whose inner diameter decreases toward the downstream side with the ejection direction as the flow direction. the plurality of second swirl flow forming portions are arranged circumferentially around the main central axis within the single main body portion, outside the first swirl flow forming portion, and at the downstream end of the second swirl flow forming portion, second ejection openings opened to the outside of the main body portion are formed in one-to-one correspondence with the second swirl flow forming portions, and a plurality of the second ejection openings are arranged in the single main body portion, and when the liquid fluid introduced into the outer circumferential flow passage portion flows into the second swirl flow forming portion via the second guide flow passage portion,In the second swirling flow forming section, the liquid fluid flows toward the second ejection opening, turns into a swirling flow, and is ejected from the second ejection opening in a state containing fine bubbles, and the swirling flows ejected into the air from the adjacent first ejection opening and the second ejection opening interfere with each other in the air at a position downstream of the second ejection opening, and the swirling direction of the swirling flow in the liquid fluid flowing through the second swirling flow forming section is set to the same direction as the swirling direction of the swirling flow in the liquid fluid flowing through the first swirling flow forming section and is shot at the ejection target, thereby cleaning the ejection target in the air, and the second ejection opening is arranged on the lower surface of the lower member along the circumferential direction of a second virtual circle having a second radius larger than the radius of the first virtual circle and centered on the main central axis.

[0007] This configuration is based on the so-called swirling flow method, in which premixed gas and liquid fluid are guided radially from the central flow passage toward the first swirling flow forming sections and are turned into swirling flows in each swirling flow forming section. Then, in addition to the shear force generated by the speed difference when the swirling flows are ejected from each swirling flow forming section (including during or after ejection), the shear force generated when the swirling flows ejected from the first swirling flow forming sections interfere with each other in the air synergistically generates an abundance of fine bubbles (e.g., microbubbles) in the liquid fluid, making it possible to eject a liquid fluid containing a high concentration of fine bubbles. Furthermore, in the present invention, the liquid fluid guided from the outer peripheral flow path portion is ejected from the second swirling flow forming portion, and the liquid fluid ejected from the first ejection opening in the first swirling flow forming portion and the liquid fluid ejected from the second ejection opening in the second swirling flow forming portion interfere with each other in the air, resulting in the generation of an even more abundant and high-concentration fine air bubbles.

[0008] Here, in the present invention, since an outer peripheral flow passage is formed between the main body and the outer casing, and the liquid fluid is guided from this outer peripheral flow passage to the second swirling flow forming portion, the guide flow passage portions are not unevenly concentrated in the main body, and the degree of freedom in design is improved. Also, by making the distances from the main central axis of the first ejection opening and the second ejection opening different, it becomes possible to arrange a large number of ejection openings, and it is possible to suppress, for example, the formation of a space where the liquid fluid is not ejected, resulting in a so-called hollow hole.

[0009] In addition, it is possible to ensure a sufficient distance between the first guide flow path section and the second guide flow path section, or between the first swirl flow forming section and the second swirl flow forming section, and it is possible to appropriately avoid congestion of flow paths in a single main body section. Therefore, the present invention has an advantage that there is more flexibility in the design layout and manufacturing (for example, casting) is easier.

[0010] However, in conventional mechanisms that spray a single swirling flow containing fine bubbles as a shower through a spray plate with many small holes, the spray plate creates a large resistance, making it difficult to ensure the water pressure difference required to generate fine bubbles. In addition, mechanisms that spray a single swirling flow as is as described above have the problem that they cannot be used as a shower. On the other hand, in the present invention, the surface of the main body on which multiple spray openings are formed becomes the spray surface, so the main body can be used as the shower body as is.

[0011] Also, a configuration is proposed in which the most upstream portion of the first guide passage portion and the most upstream portion of the second guide passage portion are relatively offset in the axial direction of the main central axis.

[0012] With this configuration, it is possible to prevent the guide flow passage portions from becoming crowded in the main body portion in the axial direction of the main central axis, and it is therefore possible to ensure sufficient dimensions and number of the swirl flow forming portions while keeping the main body portion compact, thereby significantly ensuring interference between the swirl flows. Effect of the Invention

[0013] The fine bubble generating mechanism for cleaning a spray target according to the present invention has an excellent effect of being able to form a large number of spray openings while having a simple structure. [Brief description of the drawings]

[0014] [Figure 1] FIG. 2 is a schematic side view of the shower device according to the first reference example. [Diagram 2] 1 is a schematic cross-sectional side view of a shower device according to a first reference example. [Diagram 3] 1A and 1B show a lower member according to Reference Example 1, in which (a) is a plan view and (b) is a bottom view. [Figure 4] FIG. 1(a) is a plan view of a lower member according to Reference Example 1, and FIG. 1(b) is a combined sectional view taken along line ABC of FIG. [Diagram 5] 1(a) is an explanatory diagram showing a schematic of flowing water passing through a lower member according to Reference Example 1, FIG. 1(b) is an explanatory diagram showing a schematic of flowing water passing through a central flow path section and a guide flow path section according to Reference Example 1, and FIG. 1(c) is an explanatory diagram showing a schematic of flowing water passing through a swirling flow forming section according to Reference Example 1. [Figure 6] FIG. 2 is an explanatory diagram showing a shower device according to a first reference example in use. [Figure 7] FIG. 13(a) is an explanatory diagram showing a main body of another example as Reference Example 1, and (b) is an explanatory diagram showing a shower device of the another example as Reference Example 1 in use. [Figure 8] FIG. 11 is a schematic side view of a shower device according to Reference Example 2. [Figure 9] 11A and 11B show a lower member according to Reference Example 2, where (a) is a plan view and (b) is a bottom view. [Figure 10]1 is a schematic side view of a shower device according to a first embodiment. [Figure 11] 1A and 1B show a lower member according to a first embodiment, in which FIG. [Figure 12] FIG. 2 is a partial cross-sectional perspective view of the shower device according to the first embodiment. [Figure 13] FIG. 11 is a schematic side view of a shower device according to a second embodiment. [Figure 14] FIG. 11 is a perspective view of a lower member according to a second embodiment. [Figure 15] FIG. 11 is a perspective view showing a state in which the first laminated member and the second laminated member of the lower member according to the second embodiment are separated. [Figure 16] FIG. 11 is a partially sectional perspective view of a shower device according to a second embodiment. [Figure 17] FIG. 11 is a schematic side view of a shower device according to a third embodiment. [Figure 18] FIG. 11 is a perspective view of a lower member according to a third embodiment. [Figure 19] FIG. 11 is a perspective view showing a state in which the first laminated member and the second laminated member of the lower member according to Example 3 are separated. [Figure 20] FIG. 11 is a bottom view of the lower member according to the third embodiment. [Figure 21] FIG. 11 is a partial cross-sectional perspective view of a shower device according to a third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, examples of the microbubble generating mechanism for cleaning a target to be sprayed according to the present invention will be described in detail. Note that the present invention is not limited to the examples shown below, and appropriate design changes are possible. Incidentally, microbubbles and nanobubbles are included in the microbubbles, and in this embodiment, microbubbles are used as an example. In addition, liquid fluids include various liquid fluids, and in this embodiment, water (tap water) is used as an example.

[0016] First, the basic technology of the fine bubble generating mechanism for cleaning a target object of the present invention will be described with reference to the following reference examples.

[0017] [Reference example 1] As shown in Fig. 1, shower device 1, which serves as a microbubble generating mechanism for cleaning a target, has the function of spraying running water containing microbubbles. Specifically, in Fig. 1, the spray direction is downward.

[0018] Shower device 1 has a hand-held part 10 that is held by a user, and a main body part 20A attached to the tip of the hand-held part 10. Running water supplied from a water source (not shown) passes through hand-held part 10, is introduced into main body part 20A, and is sprayed as running water containing microbubbles from spray opening 32 formed on the lower surface (bottom surface) of main body part 20A.

[0019] A gas mixer 40 is disposed upstream of the hand-held portion 10. This gas mixer 40 has a function of mixing air into water, and publicly known technology such as that disclosed in JP 2014-057915 A and the like can be suitably adopted. Details of the gas mixer 40 are omitted because they are publicly known technology.

[0020] 1 and other figures, main body 20A is made up of upper member 21, which is substantially disc-shaped and disposed on the upstream side, and lower member 22, which is disposed on the downstream side of upper member 21 and has substantially the same dimensional shape as upper member 21. Upper member 21 and lower member 22 are fastened together in a stacked state by fastening members 30 such as bolts.

[0021] 2, an introduction section 23 to which the tip of the handle 10 is connected is provided in the center of the top surface of the upper member 21, and the handle 10 can be screwed onto the outer periphery of the introduction section 23. In addition, a round hole-shaped upper member side flow path section 24 is provided in the center of the upper member 21 so as to penetrate therethrough.

[0022] In contrast, a central flow passage portion 25 having a circular shape in a plan view is provided in a concave shape on the upper surface of the lower member 22. This central flow passage portion 25 has the same inner diameter as the upper member side flow passage portion 24, and is configured as an empty chamber portion whose cross section is a plane including a circle intersecting the main central axis L1 determined along the above-mentioned ejection direction. In other words, the central flow passage portion 25 is configured as a space surrounded by a side peripheral wall portion 26 formed around the main central axis L1.

[0023] As shown in Figs. 3 and 4, a plurality (12) of guide passage sections 27 are connected to the side peripheral wall section 26 of the central passage section 25 at equal intervals and independently of each other. More specifically, the guide passage sections 27 are arranged radially around the main central axis L1, and each is composed of a narrow, linear passage section. The central passage section 25 and the guide passage section 27 are continuous, allowing water to flow from upstream to downstream. In this reference example, the depths of the guide passage sections 27 are equal to each other, and the central passage section 25 is deeper than the guide passage sections 27.

[0024] Further, swirl flow forming sections 28 serving as nozzles are provided at the downstream ends of the guide flow passage sections 27. Here, the swirl flow forming sections 28 are circular in plan view, and at the portions where each guide flow passage section 27 and each swirl flow forming section 28 are connected, a positional relationship is established in which the guide flow passage section 27 is located on a tangent to the swirl flow forming section 28. In this manner, all the guide flow passage sections 27 are offset to one side with respect to the center of each swirl flow forming section 28, and are all connected in a manner in which they are offset in the same direction.

[0025] 2, a sub-central axis L2 is defined along the flow direction in the swirl flow forming section 28. A cross section intersecting the sub-central axis L2 is circular, and the sub-central axis L2 gradually approaches the main central axis L1 downstream, and each swirl flow forming section 28 is inclined toward the main central axis L1 on the downstream side.

[0026] The upstream side of the swirl flow forming section 28 is formed by a straight portion 29A, and the downstream side is formed by a tapered portion 29B whose inner diameter decreases toward the downstream side. The downstream end of the tapered portion 29B corresponds to the lower surface (bottom surface) of the lower member 22, and the lower surface (bottom surface) has an ejection opening 32 that is open to the outside.

[0027] The flow path of the main body according to this embodiment is constituted by the central flow path section 25, the guide flow path section 27, and the swirl flow forming section 28 of this embodiment.

[0028] In the configuration described above, when flowing water containing air is introduced into main body portion 20A, this flowing water is introduced into central flow path portion 25 of lower member 22 via upper member-side flow path portion 24 of upper member 21. Then, as shown in Fig. 5, the flowing water introduced into central flow path portion 25 is blocked by bottom surface 31 of central flow path portion 25 and guided to a plurality of guide flow path portions 27 formed radially.

[0029] Then, the flowing water guided to each guide flow passage section 27 reaches the swirling flow forming section 28 connected to each tip end, and flows downward in a spiral shape to generate a swirling flow in the swirling flow forming section 28. Specifically, as the flowing water flows toward the jetting opening 32, a swirling flow is formed in all the swirling flow forming sections 28 in the right direction in a plan view.

[0030] Then, when the flowing water passes through tapered portion 29B of swirl flow forming portion 28, it is jetted out all at once from jetting opening 32 as flowing water containing microbubbles, as shown in FIG.

[0031] Here, the multiple swirling flow forming parts 28 are arranged circumferentially on the same plane, so to speak, around the main central axis L1, and the swirling flows ejected from each ejection opening 32 interfere with at least adjacent swirling flows. Therefore, due to the interference between the swirling flows, the swirling flow becomes cloudy, and mist is scattered around the swirling flow.

[0032] That is, in addition to the shear force generated by the difference in speed when the swirling flows are ejected from each swirling flow forming section 28, the shear force generated when the swirling flows ejected from the multiple swirling flow forming sections 28 interfere with each other in the air synergistically generates an abundant amount of microbubbles in the flowing water, making it possible to eject flowing water containing a high concentration of microbubbles.

[0033] Furthermore, the above configuration has multiple swirling flow forming sections 28 within a single main body section 20A, and the swirling directions of the swirling flows generated in all of the swirling flow forming sections 28 are the same, so the swirling strength of the ejected swirling flow is further improved compared to conventional products that form a single swirling flow.

[0034] Here, the cause of microbubble generation in this configuration will be considered. The liquid fluid is ejected from the ejection opening 32 into the air as a swirling flow, and interacts in the air to hit the target in the air. When the liquid fluid is ejected from the ejection opening 32 into the air, it is considered that countless droplets are instantaneously formed into spheres due to the decompression effect caused by being ejected under atmospheric pressure. In these spherical droplets, there are areas where friction occurs with the edge of the ejection opening 32 when the droplets are ejected from the ejection opening 32, and areas where the effect of friction is relatively small because the droplets are in contact with the outside air. It is presumed that the difference in frictional force causes the droplets to roll on the inner wall of the edge of the ejection opening 32 and to be ejected while rotating. This makes effective use of the shear force generated by the collision of the swirling flows ejected from the ejection opening 32 and the microscopic action caused by the rotation of the droplets of the liquid fluid.

[0035] As shown in FIG. 3, since a plurality of ejection openings 32 are arranged on the lower surface (bottom surface) of main body 20A, it is possible to make main body 20A function as a shower with a predetermined ejection pattern without making the dimensions of main body 20A excessively large.

[0036] Furthermore, since the swirling flow forming sections 28 are configured to be inclined toward the main central axis L1 on the downstream side as described above, the swirling flows ejected from each swirling flow forming section 28 can be efficiently gathered at the center and caused to interfere with each other.

[0037] In addition, the position of the swirling flows can be adjusted by the following procedure. That is, by making the inclination angle α (see FIG. 2) of each sub-center axis L2 with respect to the main center axis L1 large, the interference position between the swirling flows can be positioned closer to the main body portion 20A. On the other hand, by making the inclination angle α small, the interference position between the swirling flows can be positioned farther from the main body portion 20A. In this way, by changing the inclination angle α, the interference position between the swirling flows can be appropriately changed along the main center axis L1.

[0038] This makes it possible to optimize the distance between the body (target of spray) and main body 20A (shower head) during use of shower device 1, for example.

[0039] Furthermore, the number of swirl flow forming sections 28 provided can be changed as appropriate, and a configuration including at least two swirl flow forming sections 28 is conceivable.

[0040] Furthermore, the guide channel portion 27 does not need to be linear in plan view, and may be curved in plan view.

[0041] Furthermore, for example, the main body 20A may be made of metal or resin.

[0042] Another example will be described below.

[0043] 7(a) and 7(b), the main body 20B may be configured such that the sub-central axis L2 is also inclined in the circumferential direction about the main central axis L1. For example, the sub-central axis L2 may be inclined in the opposite direction to the swirling direction of the water flow in the swirling flow forming portion 28.

[0044] With this configuration, it is possible to form a so-called leftward “twist” in the entire right-swirling liquid fluid ejected from each ejection opening 43 formed on the underside of the lower member 42, as shown in Figure 7(b), and it is possible to form a uniform ejection pattern that matches the arrangement of each ejection opening 43.

[0045] [Reference example 2] 8, the shower device 2 of Reference Example 2 is a fine-bubble generating mechanism for cleaning a spray target, equipped with a main body 50A that uses a lower member 50 instead of the lower member 22 of Reference Example 1. Note that descriptions of parts common to Reference Example 1 will be omitted as appropriate.

[0046] 9 and other figures, the lower member 50 has a circular central flow passage portion 55 formed in a concave shape on its upper surface in a plan view. This central flow passage portion 55 is configured as an empty chamber portion having the same inner diameter as the upper member side flow passage portion 24 and a circular cross-sectional shape intersecting the main central axis L1. In other words, the central flow passage portion 55 is configured as a space surrounded by a side peripheral wall portion 56 formed around the main central axis L1.

[0047] 9 and 10, a plurality (12) of guide flow passage sections 57A are connected independently at equal intervals to the side peripheral wall section 56 of the central flow passage section 55. Separately, a plurality (12) of guide flow passage sections 57B having a length different from that of the guide flow passage sections 57A are connected independently at equal intervals to the side peripheral wall section 56.

[0048] Specifically, the overall length of the guide passage section 57A is shorter than the overall length of the guide passage section 57B, and the downstream end of the guide passage section 57B is located farther from the main central axis L1 than the downstream end of the guide passage section 57A.

[0049] Further, a swirling flow forming portion 58A serving as a nozzle is provided at the downstream end of each of the relatively short guide flow passage portions 57A. The downstream end of the swirling flow forming portion 58A is located on the lower surface (bottom surface) of the lower member 50, and an ejection opening portion 62A that is open to the outside is formed on the lower surface (bottom surface).

[0050] Furthermore, swirl flow forming portions 58B serving as nozzles are provided at the downstream ends of the relatively long guide flow passage portions 57B. The downstream ends of the swirl flow forming portions 58B are located on the lower surface (bottom surface) of the lower member 50, and the lower surface (bottom surface) has an ejection opening 62B that is open to the outside.

[0051] The configurations and functions of the guide channel sections 57A, 57B and the swirl flow forming sections 58A, 58B are similar to those of the guide channel section 27 and the swirl flow forming section 28 in the first embodiment, and therefore will not be described.

[0052] Meanwhile, as shown in FIG. 9(b), the ejection opening 62A is arranged along the circumferential direction of a first imaginary circle C1 having a first radius R1 centered on the main central axis L1 on the lower surface (bottom surface) of the lower member 50.

[0053] Similarly, the ejection opening 62B is disposed along the circumferential direction of a second imaginary circle C2 having a second radius R2 centered on the main central axis L1 on the lower surface (bottom surface) of the lower member 50. Here, a relationship is established in which the radius R2 of the second imaginary circle C2 is larger than the radius R1 of the first imaginary circle C1 (R1 <R2)。

[0054] With this configuration, it is possible to form multiple groups of ejection openings at different distances from the main central axis L1, thereby increasing the number of ejection openings and ejecting a large amount of running water containing a high concentration of microbubbles from the ejection surface.

[0055] In addition, in the reference example 2, although the injection amount is improved overall, the degree of freedom of layout in the guide flow passage parts 57A, 57B and the swirl flow forming parts 58A, 58B is limited. Specifically, if the number of the outer swirl flow forming parts 58B is increased, it becomes necessary to widen the interval of the inner swirl flow forming parts 58A to secure the guide flow passage parts 57B, and it becomes necessary to reduce the number of the inner swirl flow forming parts 58A. For this reason, the present inventor proposes the following embodiment.

[0056] Example 1 As shown in FIG. 10 etc., shower device 3 as a fine bubble generating mechanism for cleaning a spray target includes a main body 70A including a lower member 70, and a cover member 71 incorporating main body 70A.

[0057] More specifically, as shown in Fig. 12, the cover member 71 is composed of a member having an inner hollow portion, and the main body portion 70A is disposed in this inner hollow portion. The cover member 71 is attached in a state in which the lower surface of the main body portion 70A is exposed at the tip of the cover member 71. In addition, a gap is formed between the inner peripheral surface of the cover member 71 and the side peripheral surface 81 of the main body portion 70A in the inner hollow portion, and a part of the running water supplied through the handle portion 10 can flow in this gap. The gap forms the outer peripheral flow path portion 80.

[0058] Next, the lower member 70 of the main body portion 70A will be described. 11 and other figures, the lower member 70 has a circular central flow passage portion 75 formed in a concave shape on its upper surface in a plan view. This central flow passage portion 75 is configured as an empty chamber portion having the same inner diameter as the upper member side flow passage portion 24 and having a circular cross-sectional shape intersecting the main central axis L1. In other words, the central flow passage portion 75 is configured as a space surrounded by a side peripheral wall portion 76 formed around the main central axis L1.

[0059] 11(a), a plurality (12) of first guide flow passage sections 77A are connected independently at equal intervals to the side peripheral wall section 76 of the central flow passage section 75. A first swirl flow forming section 78A as a nozzle is provided at the downstream end of each of the first guide flow passage sections 77A. The downstream end of the first swirl flow forming section 78A is located on the lower surface (bottom surface) of the lower member 70, and a first ejection opening 82A that is open to the outside is formed on the lower surface (bottom surface).

[0060] Further, as shown in Fig. 11(a), a plurality (12) of second guide channel portions 77B are formed at equal intervals and independently of each other along the radial direction of the lower member 70. More specifically, the upstream end of each second guide channel portion 77B opens to the side peripheral surface 81 of the lower member 70 and faces the outer peripheral channel portion 80, so that the second guide channel portion 77B and the outer peripheral channel portion 80 are continuous. Also, second swirling flow forming portions 78B as nozzles are respectively provided at the downstream ends of the second guide channel portions 77B. The downstream ends of the second swirling flow forming portions 78B are located on the lower surface (bottom surface) of the lower member 70, and as shown in Fig. 11(b), second ejection openings 82B corresponding to the second swirling flow forming portions 78B are formed on the lower surface (bottom surface) so as to open to the outside.

[0061] Here, as shown in Fig. 11(b), the first ejection openings 82A are arranged along the circumferential direction of a first virtual circle C3 having a first radius R3 centered on the main central axis L1 on the lower surface (bottom surface) of the lower member 70 to form a first ejection opening group 85.

[0062] On the other hand, the second ejection openings 82B are arranged along the circumferential direction of a second virtual circle C4 having a second radius R4 centered on the main central axis L1 on the lower surface (bottom surface) of the lower member 70 to form a second ejection opening group 86. And a positional relationship is established in which the radius R4 of the second virtual circle C4 is larger than the radius R3 of the first virtual circle C3 (R3 < R4).

[0063] In this configuration, the liquid fluids ejected from the adjacent first ejection openings 82A, 82A interfere with each other, and similarly, the liquid fluids ejected from the adjacent second ejection openings 82B, 82B also interfere with each other. In addition, the liquid fluids ejected from the adjacent first ejection openings 82A and second ejection openings 82B also interfere with each other. The relative position of the tapered portion with respect to each ejection opening 82A, 82B is the same for both ejection openings 82A, 82B, and the tapered portion is structured to be as close as possible to each ejection opening 82A, 82B in consideration of the resistance when the swirling flow passes through the extremely narrow flow path (i.e., the portion near the ejection openings 82A, 82B).

[0064] According to the configuration of this embodiment, a plurality of ejection opening groups 85, 86 are formed at different distances from the main central axis L1, thereby increasing the number of ejection openings 82A, 82B, and making it possible to eject a large number of running water containing a high concentration of microbubbles.

[0065] Furthermore, since the first guide passage portion 77A is disposed at a position close to the main central axis L1, and the second guide passage portion 77B is disposed at a position close to the outer circumferential passage portion 80, and they are arranged in a layout where they are not crowded with each other, the degree of freedom in design is increased when manufacturing the lower member 70, and the shape is prevented from becoming complicated. Therefore, it is possible to provide a product in which the number of ejection openings 82A, 82B in the lower member 70 is efficiently increased, for example.

[0066] The configuration of the first swirling flow forming section 78A and the configuration of the second swirling flow forming section 78B are similar to those of the swirling flow forming section 28 in the above-mentioned Reference Example 1, and therefore a description thereof will be omitted. The flow path of the main body section according to the present invention is composed of the central flow path section 75, the outer circumferential flow path section 80, the first guide flow path section 77A, the second guide flow path section 77B, the first swirling flow forming section 78A, and the second swirling flow forming section 78B of the above-mentioned embodiment.

[0067] Example 2 Next, a shower device 4 according to a second embodiment will be described. 13 and other figures, shower device 4 as a fine bubble generating mechanism for cleaning a spray target comprises a main body 90A equipped with a lower member 90, and a cover member 91 that covers main body 90A. In the inner space of cover member 91, an outer circumferential flow path 100 is formed between the inner circumferential surface of cover member 91 and the outer circumferential surface of main body 90A.

[0068] As shown in Figure 15, the lower member 90 is composed of a first laminate member 92A having an approximately circular plate shape that is arranged on the downstream side and forms the ejection surface, and a second laminate member 92B having a circular plate shape that is arranged on top of the upstream surface of the first laminate member 92A.

[0069] First, the second laminated member 92B will be described with reference to FIG. 15a.

[0070] A circular central flow passage portion 95 is provided in the second laminated member 92B in a concave shape on the upper surface in a plan view. This central flow passage portion 95 is configured as a hollow portion having the same inner diameter as the upper member side flow passage portion 24 and a circular cross-sectional shape intersecting the main central axis L1, and is surrounded by a side peripheral wall portion 96. In addition, a plurality (12 pieces) of first guide flow passage portions 97A are connected to the side peripheral wall portion 96 at equal intervals independently of each other.

[0071] Furthermore, a first swirl flow forming portion 98A serving as a nozzle is provided at the downstream end of each of the first guide flow passage portions 97A. The downstream end of the first swirl flow forming portion 98A will be described later.

[0072] Next, the first laminated member 92A will be described with reference to FIG. 15b. The first laminate member 92A consists of a disk member having approximately the same outer shape as the first laminate member 92B, and the upstream end of a second guide flow path portion 97B formed along the radial direction of the laminate member 92A opens onto the side peripheral surface 101 of the first laminate member 92A.

[0073] Further, a second swirl flow forming portion 98B serving as a nozzle is provided at the downstream end of the second guide flow path portion 97B. The downstream end of the second swirl flow forming portion 98B is located on the lower surface (bottom surface) of the first laminated member 92A, and a second ejection opening portion 102B that is open to the outside is formed on the lower surface (bottom surface) as shown in FIG.

[0074] Incidentally, in the first laminated member 92A, the tapered portion of the first swirl flow forming portion 98A formed in the above-mentioned second laminated member 92B and the first jetting opening portion 102A are provided.

[0075] 16, when the first laminated member 92A and the second laminated member 92B are stacked to form the main body 90A and are built into the cover member 91, the first swirl flow forming portion 98A is continuous vertically, and the second guide flow path portion 97B and the second swirl flow forming portion 98B formed in the first laminated member 92A are covered by the second laminated member 92B.

[0076] The flow path of the main body portion according to the present invention is constituted by the central flow path portion 95, the outer peripheral flow path portion 100, the first guide flow path portion 97A, the second guide flow path portion 97B, the first swirling flow forming portion 98A, and the second swirling flow forming portion 98B of the above-mentioned embodiment.

[0077] Here, as described above, if the first guide channel portion 97A, into which the liquid fluid is introduced from the inside of the main body portion 90A, and the second guide channel portion 97B, into which the liquid fluid is introduced from the outside of the main body portion 90A, are formed separately in separate laminated members 92A and 92B, it is possible to prevent the guide channel portions 97A and 97B from being crowded together. In addition, it is possible to increase the number of the swirl flow forming portions 98A and 98B, which function as chambers, while minimizing the distance between them. This increases the degree of freedom in design when manufacturing the lower member 90, making manufacturing significantly easier.

[0078] Here, the lower member 90 may be composed of two members, a first laminated member 92A and a second laminated member 92B, but it may also be composed of three or more members, and conversely, it is not intended to actively exclude members composed of a single member.

[0079] In addition, a first guide flow path portion 97A and a first swirling flow forming portion 98A may be formed on the first laminated member 92A side, and a second guide flow path portion 97B and a second swirling flow forming portion 98B may be formed on the second laminated member 92B side.

[0080] Example 3 Third Embodiment Next, a shower device 4 according to a third embodiment will be described with reference to FIG. Shower device 5 as a fine bubble generating mechanism for cleaning a target to be sprayed has a main body 110A equipped with a lower member 110, and main body 110A is built into a cover member 111. In the inner space of cover member 111, an outer circumferential flow path 120 is formed between the inner circumferential surface of cover member 111 and main body 110A.

[0081] Moreover, as shown in FIG. 19 etc., the lower member 110 is composed of a first laminate member 112A having an approximately circular disk shape and arranged on the downstream side, and a second laminate member 112B having an approximately circular disk shape and arranged on the upstream side, stacked on the first laminate member 112A.

[0082] A circular central flow passage portion 115 is provided in a concave shape on the upper surface of the first stacked member 112A exposed at the lower surface of the cover member 111 in a plan view. On the other hand, a through hole of the same inner diameter that communicates with the central flow passage portion 115 is formed in the second stacked member 112B, and the through hole also constitutes the central flow passage portion 115. The central flow passage portion 115 is surrounded by a side peripheral wall portion 116.

[0083] Furthermore, a plurality (12 pieces) of first guide flow passage portions 117A are connected independently to a side peripheral wall portion 116 of the central flow passage portion 115 of the first laminate member 112A at equal intervals.

[0084] Further, a first swirl flow forming section 118A serving as a nozzle is provided at the downstream end of each of the first guide flow path sections 117A, and a first ejection opening 122A is formed on the lower surface (bottom surface) of the first laminate member 112A.

[0085] 20 and other drawings, the upstream ends of a plurality of (12) second guide flow passage portions 117B are connected to the side peripheral surface 121A of the first laminated member 112A. As a result, the upstream ends of the second guide flow passage portions 117B are continuous with the outer circumferential flow passage portion 120.

[0086] Further, a second swirl flow forming section 118B serving as a nozzle is provided at the downstream end of the second guide flow path section 117B, and a second ejection opening 122B is formed on the lower surface (bottom surface) of the first stacked member 112A.

[0087] Furthermore, in the second laminated member 112B, a plurality (12 pieces) of third guide flow passage portions 117C are connected to the side peripheral wall portion 116 of the central flow passage portion 115 at equal intervals and independently of one another.

[0088] Further, a third swirl flow forming portion 118C serving as a nozzle is provided at the downstream end of the third guide flow path portion 117C, and a third ejection opening 122C is formed on the lower surface (bottom surface) of the first stacked member 112A.

[0089] 20 and other drawings, the upstream ends of a plurality of (12) fourth guide flow passage portions 117D are connected to the side peripheral surface 121B of the second laminated member 112B. As a result, the upstream ends of the fourth guide flow passage portions 117D are continuous with the outer circumferential flow passage portion 120.

[0090] Furthermore, a fourth swirling flow forming section 118D as a nozzle is provided at the downstream end of the fourth guide flow path section 117D, and a fourth ejection opening 122D continuous with a flow path penetrating the first stack member 112A is formed on the lower surface (bottom surface) of the first stack member 112A.

[0091] The flow path of the main body portion according to the present invention is constituted by the central flow path portion 115 of the above-mentioned embodiment, the outer peripheral flow path portion 120, the first guide flow path portion 117A, the second guide flow path portion 117B, the third guide flow path portion 117C, the fourth guide flow path portion 117D, the first swirling flow forming portion 118A, the second swirling flow forming portion 118B, the third swirling flow forming portion 118C, and the fourth swirling flow forming portion 118D.

[0092] Here, as shown in FIG. 20, the first ejection openings 122A are arranged along the circumferential direction of a first virtual circle C5 having a first radius R5 centered on the main central axis L1 on the lower surface (bottom surface) of the first laminated member 112A to form a first ejection opening group 135.

[0093] Similarly, the second ejection opening 122B and the fourth ejection opening 122D are arranged along the circumferential direction of a second virtual circle C6 having a second radius R6 centered on the main central axis L1 on the lower surface (bottom surface) of the first laminated member 112A to form a second ejection opening group 136.

[0094] Furthermore, the third ejection openings 122C are arranged along the circumferential direction of a third virtual circle C7 having a third radius R7 centered on the main central axis L1 on the lower surface (bottom surface) of the first laminated member 112A to form a third ejection opening group 137.

[0095] Here, the radius R7 of the third imaginary circle C7 is larger than the radius R5 of the first imaginary circle C5, and the radius R6 of the second imaginary circle C6 is even larger than the radius R7 (R5 <R7<R6)。

[0096] With this configuration, it is possible to form a plurality of groups of ejection openings at different distances from the main central axis L1, increase the number of ejection openings, and eject a large amount of running water containing a high concentration of microbubbles.

[0097] Furthermore, as shown in FIG. 21, by adopting a "multi-layer structure with internal and external water supply structure" including a first laminated member 112A and a second laminated member 112B, it is possible to ensure a sufficient amount of spray over a wide range by arranging multiple groups of spray openings concentrically while fully ensuring the functionality of the swirling flow forming section.

[0098] In this embodiment, it is of course possible to add further laminated members to form a multi-layer structure, and to form a guide flow path portion and a swirling flow forming portion in each laminated member.

[0099] Furthermore, the fine bubble generating mechanism for cleaning a spray target according to the present invention may be used in a dishwasher or a water purifier, and may of course also be used for other purposes. [Explanation of symbols]

[0100] 1,2,3,4,5 Shower device (fine bubble generating mechanism for spray cleaning of target) 10 Handle 20A, 20B, 50A, 70A, 90A, 110A Main unit 21 Upper member 22,42,50,70,90,110 Lower part 23 Introduction 24 Upper member side channel section 25,55,75,95,115 Central passage 26,56,76,96,116 Side peripheral wall 27, 57A, 57B Guide passage section 28,58A,58B Swirling flow forming part 30 Fastening members 31 Bottom 32,43 Spout opening 40 Gas Mixer 62A,62B Spout opening 71, 91, 111 Cover parts 77A, 97A, 117A First guide passage section 77B, 97B, 117B Second guide passage section 78A, 98A, 118A First swirl flow forming section 78B, 98B, 118B Second swirl flow forming section 80,100,120 Outer periphery flow passage 81,101,121A,121B Side surface 82A, 102A, 122A First jet opening 82B, 102B, 122B Secondary jet opening 85,135 First group of erupting openings 86,136 Secondary eruptive orifices 92A, 112A First laminated member 92B, 112B Second laminated member 117C Third guide channel section 117D Fourth guide channel section 118A First swirl flow forming section 118B Second swirl flow forming section 118C Third swirl forming section 118D 4th swirl forming section 122C Third jet opening 122D Fourth Spout Orifice 137 Third group of eruptions C1, C3, C5 First virtual circle C2, C4, C6 Second virtual circle C3, C7 Third imaginary circle L1 Main central axis L2 Sub-center axis R1, R3, R5 First radius R2, R4, R6 Second radius R7 Third Radius α Incline angle

Claims

1. A microbubble generating mechanism for cleaning a target, in which a liquid fluid containing microbubbles is ejected into the air along a predetermined ejection direction, and the liquid fluid is projected onto a target in the air, comprising: A single body portion having a flow passage formed therein, The flow path is a central flow passage portion having a concave shape, the central flow passage portion being configured with a chamber portion having a cross section that includes a plane including a circle centered on the main central axis, the central flow passage portion being configured with a main central axis that is an axis line that is determined along the ejection direction, and a liquid fluid flows in from the outside of the main body portion along the main central axis; a plurality of first guide passage portions connected to a side peripheral wall portion formed around the main central axis of the central passage portion, the first guide passage portions being continuous with the central passage portion and radially arranged around the main central axis; a plurality of first swirl flow forming sections each of which is continuous with a downstream end of the first guide flow passage section and which is configured with a passage section including a tapered portion whose inner diameter decreases toward the downstream with the jetting direction being the flow direction; Equipped with the plurality of first swirl flow forming portions are arranged circumferentially around the central flow passage portion with the main central axis as the center within the single main body portion, and first ejection openings that are open to the outside of the main body portion are formed at downstream ends of the first swirl flow forming portions so as to correspond one-to-one with the first swirl flow forming portions, and a plurality of the first ejection openings are arranged in the single main body portion; When the liquid fluid introduced into the central flow path portion flows into the first swirling flow forming portion via the first guide flow path portion, the liquid fluid becomes a swirling flow while flowing toward the first ejection opening in the first swirling flow forming portion, and is ejected from the first ejection opening in a state containing fine bubbles, and the swirling flows ejected into the air from adjacent first ejection openings interfere with each other in the air at a position downstream of the first ejection opening, and the swirling directions of the swirling flows of the liquid fluid flowing through the first swirling flow forming portion are made the same in all of the first swirling flow forming portions and are shot at a target to be ejected, thereby cleaning the target to be ejected in the air, The single main body is a lower member, and an upper member is overlapped on an upper surface of the lower member that is an upstream surface and fastened to the lower member, an inlet through which a liquid fluid is introduced is provided at the center of an upper surface of the upper member, the upper surface being the upstream surface of the upper member; and a circular hole-shaped upper member-side flow path portion communicating with the inlet is provided in a penetrating manner at the center of the upper member, On the other hand, the lower member has the central flow passage portion, the plurality of first guide flow passage portions, and the first swirl flow forming portion provided so as to be exposed on an upper surface of the lower member, and when the upper member and the lower member are superimposed, the upper member side flow passage portions and the central flow passage portion are connected to each other, and the first guide flow passage portions and the first swirl flow forming portions are covered by the lower surface which is the downstream surface of the upper member, and the first ejection opening portions are arranged on the lower surface which is the downstream surface of the lower member, The first guide passage portions are arranged radially around the main central axis at equal intervals and independently of one another, the first ejection openings are disposed on the lower surface of the lower member along a circumferential direction of a first virtual circle having a predetermined first radius centered on the main central axis, The device further includes an outer housing, the main body is disposed within the outer housing, a lower surface of the lower member of the main body is exposed at a tip of the outer housing, and an outer peripheral flow path is formed between a side peripheral surface of the lower member and an inner peripheral surface of the outer housing, through which a portion of a liquid fluid introduced from outside the main body can flow, Further, the flow path includes: a plurality of second guide passage portions formed in the lower member at equal intervals and radially around the main central axis so that upstream ends of the second guide passage portions are continuous with the outer circumferential passage portion; a plurality of second swirl flow forming sections each of which is continuous with a downstream end of the second guide flow passage section and which is configured with a passage section including a tapered portion whose inner diameter decreases toward the downstream with the jetting direction being the flow direction; Equipped with the plurality of second swirl flow forming portions are arranged circumferentially around the main central axis in the single main body portion, outside the first swirl flow forming portion, and at the downstream end of the second swirl flow forming portion, second ejection openings that are open to the outside of the main body portion are formed in one-to-one correspondence with the second swirl flow forming portions, and the second ejection openings are arranged in plurality in the single main body portion; When the liquid fluid introduced into the outer peripheral flow path portion flows into the second swirling flow forming portion through the second guide flow path portion, the liquid fluid in the second swirling flow forming portion becomes a swirling flow while flowing toward the second ejection opening, and is ejected from the second ejection opening in a state containing fine bubbles, and the swirling flows ejected into the air from the first ejection opening and the second ejection opening adjacent to each other interfere with each other in the air at a position downstream of the second ejection opening, and the swirling direction of the swirling flow in the liquid fluid flowing through the second swirling flow forming portion is set to the same direction as the swirling direction of the swirling flow in the liquid fluid flowing through the first swirling flow forming portion and is shot at a spray target, thereby cleaning the spray target in the air, The second ejection openings are arranged along the circumferential direction of a second imaginary circle having a second radius larger than the radius of the first imaginary circle and centered on the main central axis on the lower surface of the lower member. A fine bubble generating mechanism for cleaning a target.

2. In the axial direction of the main central axis, a most upstream portion of the first guide passage portion and a most upstream portion of the second guide passage portion are relatively offset from each other. The microbubble generating mechanism for cleaning a target according to claim 1.

Images