Microbubble generation mechanism for cleaning target surfaces.

Abstract

To provide a fine bubble generating mechanism, regardless of a simple configuration, capable of increasing a flow rate of liquid fluid containing fine bubbles.SOLUTION: A shower device as a fine bubble generating mechanism comprises a body part having a flow passage therein. The flow passage includes a central flow passage 75, first guide flow passages 77A radially disposed around a main central axis in the central flow passage 75, first swirl flow forming parts 78A continuous with downstream-side ends of the first guide flow passages 77A, second guide flow passages 77B connected to a side peripheral wall of the first swirl flow forming parts 78A, and second swirl flow forming parts 78B continuous with downstream-side ends of the second guide flow passage 77B. Running water containing microbubbles is ejected from a first spout opening and a second spout opening, and swirl flows ejected from at least adjacent spout openings interfere with each other.SELECTED DRAWING: Figure 11

Description

Technical Field

[0001] The present invention relates to a microbubble generation mechanism for cleaning an injection target, which injects a liquid fluid containing fine bubbles such as microbubbles toward an injection target in the air.

Background Art

[0002] Conventionally, as a mechanism for ejecting running water containing fine bubbles such as microbubbles, a mechanism using a swirling flow method is known. (See, for example, Patent Document 1). Further, the present inventor has provided a microbubble generation mechanism for cleaning an injection target that generates a large amount of microbubbles and has a high cleaning effect while having a compact structure (see Patent Document 2).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, while a more compact overall structure is required, it is also further required to increase the amount of fine bubbles such as microbubbles or to increase the amount and strength of the water flow.

[0005] Therefore, an object of the present invention is to provide a microbubble generation mechanism for cleaning an injection target that has a simple structure and an improved degree of design freedom.

Means for Solving the Problems

[0006] The present invention relates to a microbubble generation mechanism for spraying target cleaning, in which a liquid fluid containing microbubbles is sprayed into the air along a predetermined spraying direction, and the liquid fluid is sprayed onto a target in the air, comprising a single main body having a flow path formed inside, the flow path being composed of a void portion whose cross-section includes a plane containing a circle centered on the main central axis, and a concave central flow path portion into which the liquid fluid flows in from outside the main body along the main central axis, and the main central The device comprises: a plurality of first guide channel sections connected to the side circumferential wall sections formed around the axis and continuous with the central channel section, and arranged radially and independently at equal intervals around the main central axis; and a plurality of first swirling flow forming sections, each continuous with the downstream end of the first guide channel sections, and comprising passage sections including tapered sections whose inner diameter decreases as they proceed downstream with the ejection direction as the flow direction, wherein the plurality of first swirling flow forming sections are arranged circumferentially around the central channel section with the main central axis within the single main body section. The first swirling flow forming section is arranged in a row, and at the downstream end of the first swirling flow forming section, a first ejection opening is formed that is open to the outside of the main body, and a plurality of the first ejection openings are arranged in a single main body, and furthermore, the upstream ends of the plurality of the first swirling flow forming sections are connected to the side peripheral walls and are continuous with the first swirling flow forming section, and the downstream end of the second guide channel section is continuous with the main central axis and the ejection openings are continuous with the first swirling flow forming section The apparatus comprises a second swirling flow forming section, which is composed of a passage section including a tapered portion whose inner diameter decreases as it moves downstream with the outlet direction as the flow direction, and a second ejection opening, which is open to the outside of the main body, is formed at the downstream end of the second swirling flow forming section in a one-to-one correspondence with the second swirling flow forming section, and a plurality of the second ejection openings are arranged in the single main body, and the flow rate per unit time of the liquid fluid ejected from the first ejection opening is approximately equal to the flow rate per unit time of the liquid fluid ejected from the second ejection opening.The liquid fluid introduced into the central flow channel flows into the first swirling flow forming section via the first guide channel, a portion of the liquid fluid that has flowed into the first swirling flow forming section flows into the second guide channel and flows into the second swirling flow forming section via the second guide channel, in the first swirling flow forming section the liquid fluid flows toward the first ejection opening and becomes a swirling flow, which is ejected from the first ejection opening containing fine bubbles, and in the second swirling flow forming section the liquid fluid flows toward the second ejection opening The fluid is ejected from the second ejection opening as a swirling flow containing fine bubbles, and in the swirling flow ejected into the air from the first ejection opening and the swirling flow ejected into the air from the second ejection opening, at least adjacent swirling flows interfere with each other in the air downstream of the first and second ejection openings, and the swirling directions of the swirling flows in the liquid fluid flowing through the first and second swirling flow forming sections are made to be the same direction and directed at the target object, thereby cleaning the target object in the air. Furthermore, the single main body is a lower member, and an upper member is further provided which is superimposed on the upper surface of the lower member, which is the upstream surface, and fastened to the lower member, with an introduction section for introducing liquid fluid provided in the center of the upper surface of the upper member, which is the upstream surface, and a circular hole-shaped upper member side flow channel section communicating with the introduction section provided through the center of the upper member, and the lower member has the central flow channel section, the first guide flow channel section, the first swirling flow forming section, the second guide flow channel section, and the second swirling flow forming section exposed on the upper surface of the lower member. This is a microbubble generation mechanism for cleaning a target by spraying, characterized in that it is provided such that, when the upper member and the lower member are superimposed, the upper member side flow path and the central flow path are in communication, the first guide flow path, the first swirling flow forming section, the second guide flow path, and the second swirling flow forming section are covered by the lower surface of the upper member which is the downstream side, the inner diameter of the upper member side flow path and the inner diameter of the central flow path are the same, and the first ejection opening and the second ejection opening are arranged on the lower surface of the lower member which is the downstream side.

[0007] This configuration is based on a so-called swirling flow method, in which a pre-mixed gas and liquid fluid are guided radially from the central flow channel toward the first swirling flow forming section, where they are transformed into a swirling flow. Then, in addition to the shear force generated by the velocity difference when the swirling flow is 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 section interfere with each other in the air synergistically generates a rich amount 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, the present invention includes a second swirling flow forming section, which allows for a compact overall structure while substantially doubling the number of ejection openings. As the liquid fluid ejected from nearby ejection openings interferes with each other in the air, an even richer concentration of fine bubbles is generated.

[0008] Furthermore, by making the flow rate per unit time of the liquid fluid ejected from the first ejection port approximately equal to the flow rate per unit time of the liquid fluid ejected from the second ejection port, the liquid fluid can be ejected almost uniformly and without unevenness.

[0009] Here, it is desirable that the first and second ejection openings are not aligned linearly from the main central axis, but rather offset in the circumferential direction, in a so-called staggered arrangement. This allows for a compact configuration while preventing uneven distribution of the liquid fluid ejected from the ejection openings.

[0010] However, in conventional mechanisms that spray a single swirling flow containing fine bubbles as a shower through a spray plate equipped with numerous small-diameter holes, this spray plate creates significant resistance, making it difficult to secure the water pressure difference necessary to generate fine bubbles. Furthermore, mechanisms that spray a single swirling flow as described above cannot be used as a shower. On the other hand, in the present invention, since the surface of the main body part, which has multiple ejection openings, becomes the spray surface, it is possible to use the main body part as a shower body. [Effects of the Invention]

[0011] The microbubble generation mechanism for cleaning targets using spray, according to the present invention, has the excellent effect of being able to form a large number of ejection openings while having a simple structure. [Brief explanation of the drawing]

[0012] [Figure 1] This is a schematic side view of the shower device according to Reference Example 1. [Figure 2] This is a cross-sectional overview of the shower device according to Reference Example 1. [Figure 3] The lower member of Reference Example 1 is shown, with (a) being a plan view and (b) being a bottom view. [Figure 4] (a) is a plan view of the lower member according to Reference Example 1, and (b) is a cross-sectional view of the combination of lines A, B, and C in (a). [Figure 5] (a) is a schematic diagram illustrating the flow of water passing through the lower member according to Reference Example 1, (b) is a schematic diagram illustrating the flow of water passing through the central channel section and the guide channel section according to Reference Example 1, and (c) is a schematic diagram illustrating the flow of water passing through the swirling flow forming section according to Reference Example 1. [Figure 6] This is an explanatory diagram showing the shower device in use as described in Reference Example 1. [Figure 7] (a) is an explanatory diagram showing the main body of another example as Reference Example 1, and (b) is an explanatory diagram showing the shower device in use as another example as Reference Example 1. [Figure 8] This is a schematic side view of the shower device according to Reference Example 2. [Figure 9] The lower member of Reference Example 2 is shown, with (a) being a plan view and (b) being a bottom view. [Figure 10] This is a schematic side view of the shower device according to Example 1. [Figure 11] This is a plan view of the lower member according to Example 1. [Figure 12] This is a bottom view of the lower member according to Example 1. [Figure 13] It is a partial cross-sectional perspective view of a shower device according to Example 1.

Mode for Carrying Out the Invention

[0013] Hereinafter, embodiments in which the microbubble generation mechanism for cleaning an injection target of the present invention is embodied will be described in detail. Note that the present invention is not limited to the embodiments shown below, and design changes can be made as appropriate. By the way, microbubbles include microbubbles, nanobubbles, etc. In this embodiment, microbubbles will be described as an example. Also, liquid fluids include various liquid fluids. In this embodiment, water (tap water) will be described as an example.

[0014] First, the basic technology of the microbubble generation mechanism for cleaning an injection target of the present invention will be described along the following reference examples.

[0015] As shown in FIG. 1, a shower device 1 as a microbubble generation mechanism for cleaning an injection target has a function of ejecting running water containing microbubbles. Specifically, in FIG. 1, the downward direction is the ejection direction.

[0016] The shower device 1 also has a hand-held portion 10 that a user holds and a main body portion 20A attached to the tip of the hand-held portion 10. After the running water supplied from a water source (not shown) passes through the hand-held portion 10, it is introduced into the main body portion 20A and ejected from an ejection opening 32 formed on the lower surface (bottom surface) of the main body portion 20A as running water containing microbubbles.

[0017] A gas mixer 40 is disposed on the upstream side of the hand-held portion 10. This gas mixer 40 has a function of mixing air with water, and a known technique such as that disclosed in JP-A-2014-057915 can be preferably employed. Details of the gas mixer 40 are omitted because they are known techniques.

[0018] ​Furthermore, as shown in Figure 1, the main body 20A is composed of an upper member 21 which is roughly disc-shaped and positioned on the upstream side, and a lower member 22 which is positioned downstream of the upper member 21 and has roughly the same dimensions and shape as the upper member 21. The upper member 21 and the lower member 22 are fastened together by fastening members 30 such as bolts, overlapping each other.

[0019] As shown in Figure 2, an introduction section 23 is provided in the center of the upper surface of the upper member 21 to which the tip of the handle 10 is connected, and the handle 10 can be screwed onto the outer circumference of the introduction section 23. In addition, a circular hole-shaped upper member side flow channel section 24 is provided through the center of the upper member 21.

[0020] In contrast, the upper surface of the lower member 22 is provided with a concave central channel section 25, which is circular in plan view. This central channel section 25 has the same inner diameter as the upper member side channel section 24 and is composed of a void section whose cross-section includes a circle that crosses the main central axis L1, which is determined to be aligned with the ejection direction described above. In other words, the central channel section 25 is composed of a space surrounded by side circumferential wall sections 26 formed around the main central axis L1.

[0021] Furthermore, as shown in Figures 3 and 4, multiple (12) guide channel sections 27 are connected to the side circumferential wall section 26 of the central channel section 25 at equal intervals and independently of each other. More specifically, the guide channel sections 27 are arranged radially around the main central axis L1, and each consists of a narrow, straight channel section. The central channel section 25 and the guide channel sections 27 are continuous, allowing water to flow from upstream to downstream. In this reference example, the depth of each guide channel section 27 is equal to that of the other guide channel sections 27, and the central channel section 25 is deeper than the depth of the guide channel sections 27.

[0022] Furthermore, each guide channel section 27 is provided with a swirling flow forming section 28, which acts as a nozzle, at its downstream end. Here, the swirling flow forming section 28 is circular in plan view, and at the point where each guide channel section 27 and each swirling flow forming section 28 are connected, the guide channel section 27 is located tangent to the swirling flow forming section 28. In this way, all guide channel sections 27 are offset to one side with respect to the center of each swirling flow forming section 28, and are connected in a manner in which they are all offset in the same direction.

[0023] Furthermore, the swirling flow forming section 28 is composed of a flow path section with the ejection direction as the flow direction, and as shown in Figure 2, a sub-central axis L2 is defined along the flow direction in the swirling flow forming section 28. The cross-section that crosses the sub-central axis L2 is circular in shape, and the sub-central axis L2 asymptotically approaches the main central axis L1 as it moves downstream, so that each swirling flow forming section 28 is inclined towards the main central axis L1 on the downstream side.

[0024] Furthermore, the upstream side of the swirling flow forming section 28 is formed as a straight-shaped section 29A, while the downstream side is formed as a tapered-shaped section 29B whose inner diameter decreases as it moves downstream. The downstream end of the tapered-shaped section 29B corresponds to the lower surface (bottom surface) of the lower member 22, and an open ejection opening 32 is formed on this lower surface (bottom surface).

[0025] Furthermore, the flow path of the main body of this reference example is composed of the central flow path section 25, the guide flow path section 27, and the swirling flow forming section 28 described above.

[0026] In the configuration described above, when flowing water containing air is introduced into the main body 20A, this flowing water is introduced into the central flow channel 25 of the lower member 22 via the upper member side flow channel 24 of the upper member 21. Then, as shown in Figure 5, the flowing water introduced into the central flow channel 25 is dammed by the bottom surface 31 of the central flow channel 25 and guided into a plurality of radially formed guide channel sections 27.

[0027] The water flowed through each guide channel section 27 then reaches the swirling flow forming section 28 connected to each tip, where it flows spirally downwards to generate a swirling flow. Specifically, as the water flows toward the ejection opening 32, a swirling flow is formed in a rightward direction in a plan view at all of the swirling flow forming sections 28.

[0028] Then, as the water passes through the tapered portion 29B of the swirling flow forming section 28, it is ejected all at once from the ejection opening 32 as water containing microbubbles, as shown in Figure 6.

[0029] Here, the multiple swirling flow forming sections 28 are arranged circumferentially on the same plane, so to speak, with respect to the main central axis L1, and the swirling flows ejected from each ejection opening 32 interfere with at least adjacent swirling flows. As a result of this interference between the swirling flows, the swirling flows become cloudy, and a mist-like dispersion occurs around the swirling flows.

[0030] In other words, in addition to the shear force generated by the velocity difference when the swirling flow is ejected from each swirling flow forming section 28, the shear force generated when the swirling flows ejected from multiple swirling flow forming sections 28 interfere with each other in the air synergistically generates a rich amount of microbubbles in the flowing water, making it possible to eject flowing water containing a high concentration of microbubbles.

[0031] Furthermore, the above configuration includes multiple swirling flow forming units 28 within a single main body 20A, and the swirling direction of the swirling flows generated by all swirling flow forming units 28 is the same. As a result, the swirling intensity of the ejected swirling flow is further improved compared to conventional products that form a single swirling flow.

[0032] Here, we consider the factors that cause microbubbles to be generated in this configuration. The liquid fluid is ejected into the air from the ejection port 32 as a swirling flow, and after interfering in the air, it is directed at the target object in the air. When the liquid fluid is ejected into the air from the ejection port 32, it is thought that countless spherical droplets are instantaneously formed due to the depressurization effect caused by being released under atmospheric pressure. In these spherical droplets, there are parts where friction occurs with the opening edge of the ejection port 32 as it is ejected, and parts where the effect of friction is relatively small because it is in contact with the outside air. It is estimated that due to the difference in frictional force, the droplets rotate as they are ejected, rolling along the inner wall of the opening edge of the ejection port 32. Thus, unlike configurations that send liquid fluid containing microbubbles into a liquid (e.g., water), this configuration effectively utilizes the shear force generated by the collision of swirling flows ejected from the ejection port 32 and the microscopic effects of the rotation of the liquid fluid droplets.

[0033] Furthermore, as shown in Figure 3, since multiple ejection openings 32 are arranged on the lower surface (bottom surface) of the main body 20A, it is possible to make the main body 20A function as a shower with a predetermined spray pattern without making its dimensions excessively large.

[0034] Furthermore, as described above, since the swirling flow forming section 28 is inclined toward the main central axis L1 on the downstream side, the swirling flows ejected from each swirling flow forming section 28 can be efficiently collected at the center and allowed to interfere with each other.

[0035] Furthermore, the position of the swirling flow can be adjusted by following the procedure below. Specifically, by setting a large inclination angle α (see Figure 2) of each sub-central axis L2 with respect to the main central axis L1, the interference point between the swirling flows can be moved closer to the main body 20A. On the other hand, by setting a small inclination angle α, the interference point between the swirling flows can be moved further away from the main body 20A. In this way, by changing the inclination angle α, the interference point between the swirling flows can be appropriately changed along the main central axis L1.

[0036] This makes it possible to optimize the distance between the body (target of spraying) and the main body 20A (shower head) during use in the shower device 1.

[0037] Furthermore, the number of swirling flow forming units 28 can be changed as appropriate, and a configuration with at least two or more swirling flow forming units 28 is conceivable.

[0038] Furthermore, the guide channel section 27 does not need to be straight in plan view; it may be curved in plan view.

[0039] Furthermore, for example, the main body 20A may be made of metal or resin.

[0040] Further examples are explained below.

[0041] As shown in Figures 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 around the main central axis L1. For example, the direction in which the sub-central axis L2 is inclined may be opposite to the direction of rotation of the water flow in the swirling flow forming section 28.

[0042] With this configuration, as shown in Figure 7(b), it becomes possible to create a so-called leftward "twist" in the entire rightward-swirling liquid fluid ejected from each ejection opening 43 formed on the lower surface of the lower member 42, and to form a uniform injection pattern that matches the arrangement of each ejection opening 43.

[0043] [Reference example 2] As shown in Figure 8, the shower device 2 of Reference Example 2 is a fine bubble generation mechanism for cleaning the target of spraying, which includes a main body 50A that uses a lower member 50 instead of the lower member 22 of Reference Example 1. Note that explanations of parts common to Reference Example 1 will be omitted as appropriate.

[0044] As shown in Figure 9, the lower member 50 has a circular central channel section 55 concavely formed on its upper surface in a plan view. This central channel section 55 has the same inner diameter as the upper member side channel section 24 and is composed of a void section with a circular cross-sectional shape that crosses the main central axis L1. In other words, the central channel section 55 is composed of a space surrounded by side circumferential wall sections 56 formed around the main central axis L1.

[0045] Furthermore, as shown in Figures 9 and 10, multiple (12) guide channel sections 57A are connected to the side circumferential wall section 56 of the central channel section 55 at equal intervals and independently of each other. In addition, multiple (12) guide channel sections 57B, which are of different lengths from the guide channel sections 57A, are connected to the side circumferential wall section 56 at equal intervals and independently of each other.

[0046] Specifically, the total length of the guide channel section 57A is shorter than the total length of the guide channel section 57B, and the downstream end of the guide channel section 57B is further from the main central axis L1 than the downstream end of the guide channel section 57A.

[0047] Furthermore, a swirling flow forming section 58A, which acts as a nozzle, is provided at the downstream end of the relatively short guide channel section 57A. The downstream end of the swirling flow forming section 58A is located on the lower surface (bottom surface) of the lower member 50, and an outlet opening 62A that is open to the outside is formed on this lower surface (bottom surface).

[0048] Furthermore, a swirling flow forming section 58B, which functions as a nozzle, is provided at the downstream end of the relatively long guide channel section 57B. The downstream end of the swirling flow forming section 58B is located on the lower surface (bottom surface) of the lower member 50, and an outlet opening 62B that is open to the outside is formed on this lower surface (bottom surface).

[0049] The configuration and function of the guide channel sections 57A and 57B, and the swirling flow forming sections 58A and 58B are the same as those of the guide channel section 27 and swirling flow forming section 28 in Reference Example 1, so their explanation will be omitted.

[0050] Incidentally, as shown in Figure 9(b), the ejection opening 62A is positioned along the circumferential direction of a first virtual circle C1 with a first radius R1 centered on the main central axis L1 on the lower surface (bottom surface) of the lower member 50.

[0051] Similarly, the ejection opening 62B is positioned along the circumferential direction of a second virtual circle C2 with a second radius R2 centered on the main central axis L1 on the lower surface (bottom surface) of the lower member 50. Here, the relationship holds that the radius R2 of the second virtual circle C2 is larger than the radius R1 of the first virtual circle C1 (R1 <R2)。

[0052] This configuration allows for the formation of multiple groups of ejection openings at different distances from the main central axis L1, thereby increasing the number of ejection openings and enabling the ejection of a large number of streams of water containing high concentrations of microbubbles from the ejection surface.

[0053] In Reference Example 2, although the overall injection volume is improved, there are limitations to the layout flexibility of the guide channel sections 57A and 57B, and the swirling flow forming sections 58A and 58B. Specifically, if the number of outer swirling flow forming sections 58B is increased, it becomes necessary to widen the spacing of the inner swirling flow forming sections 58A in order to secure the guide channel section 57B, which necessitates a reduction in the number of inner swirling flow forming sections 58A. For this reason, the inventor proposes the following embodiment.

[0054] [Example 1] As shown in Figure 10, the shower device 3, which serves as a microbubble generation mechanism for cleaning the target of spraying, includes a main body 70A that includes a lower member 70.

[0055] As shown in Figures 11 and 12, the lower member 70 has a circular central channel section 75 concavely formed on its upper surface in a plan view. This central channel section 75 has the same inner diameter as the upper member side channel section 24 and is composed of a circular empty chamber with a cross-sectional shape that crosses the main central axis L1. In other words, the central channel section 75 is composed of a space surrounded by side circumferential wall sections 76 formed around the main central axis L1.

[0056] Furthermore, as shown in Figure 11, a plurality (12) of first guide channel sections 77A are connected to the side circumferential wall section 76 of the central channel section 75 at equal intervals and independently of each other. In addition, a first swirling flow forming section 78A, which acts as a nozzle, is provided at the downstream end of each first guide channel section 77A. Specifically, all openings located at the downstream end of the first guide channel section 77A face the interior of the first swirling flow forming section 78A. The downstream end of the first swirling flow forming section 78A is located on the lower surface (bottom surface) of the lower member 70, and a first ejection opening 82A, which is open to the outside, is formed on this lower surface (bottom surface). Note that the first swirling flow forming section 78A and the first ejection opening 82A are formed to correspond one-to-one.

[0057] Furthermore, a second guide channel section 77B is formed from the side circumferential wall of the first swirling flow forming section 78A, independently of the first guide channel section 77A. That is, all openings located at the upstream end of the second guide channel section 77B face the interior of the first swirling flow forming section 78A. In this way, the second guide channel section 77B is continuous with the first swirling flow forming section 78A and is positioned outside the first swirling flow forming section 78A with respect to the main central axis L1. Note that the first swirling flow forming section 78A and the second guide channel section 77B are formed to have a one-to-one correspondence.

[0058] The first guide channel section 77A and the second guide channel section 77B are each linear in shape along their longitudinal direction and are indirectly connected with the first swirling flow forming section 78A in between. The axis of the first guide channel section 77A along the flow direction and the axis of the second guide channel section 77B along the flow direction are not aligned on the same straight line, and are formed to be positioned at a predetermined angle with respect to the first swirling flow forming section 78A as the base point.

[0059] Furthermore, a second swirling flow forming section 78B, which functions as a nozzle, is provided at the downstream end of the second guide channel section 77B.

[0060] The downstream end of the second swirling flow forming section 78B is located on the lower surface (bottom surface) of the lower member 70, and a second ejection opening 82B, which is open to the outside, is formed on this lower surface (bottom surface). The second swirling flow forming section 78B and the second ejection opening 82B are formed to correspond one-to-one.

[0061] Here, the second swirling flow forming section 78B is positioned at a required location so that the first ejection opening 82A and the second ejection opening 82B are not aligned on the same radial line with respect to the main central axis L1.

[0062] Furthermore, the dimensions of each part are set so that the flow rate per unit time of the liquid fluid ejected from the first ejection opening 82A is approximately equal to the flow rate per unit time of the liquid fluid ejected from the second ejection opening 82B. This is determined appropriately by factors such as the difference in cross-sectional area between the first guide channel section 77A and the second guide channel section 77B, the angle between the axis in the first guide channel section 77A and the axis in the second guide channel section 77B, and the viscosity of the liquid fluid flowing through it. Alternatively, the width of the second guide channel section 77B may be made narrower or the depth shallower compared to the first guide channel section 77A so that the flow rate per unit time of the liquid fluid ejected from the first ejection opening 82A is approximately equal to the flow rate per unit time of the liquid fluid ejected from the second ejection opening 82B.

[0063] Incidentally, it is desirable that the angle between the axis in the first guide channel section 77A and the axis in the second guide channel section 77B be an obtuse angle of 90 degrees or more.

[0064] As a result, in the first swirling flow forming section 78A, the liquid fluid flows toward the first ejection opening 82A, forming a swirling flow which is then ejected from the first ejection opening 82A containing fine bubbles.

[0065] Furthermore, in the second swirling flow forming section 78B, the liquid fluid flows toward the second ejection opening 82B, forming a swirling flow which is then ejected from the second ejection opening 82B containing fine bubbles.

[0066] In this configuration, in the swirling flow ejected into the air from the first ejection opening 82A and the swirling flow ejected into the air from the second ejection opening 82B, at least adjacent swirling flows interfere with each other in the air downstream of the first ejection opening 82A and the second ejection opening 82B.

[0067] In other words, the liquid fluids ejected from adjacent first ejection openings 82A, 82A interfere with each other, and similarly, the liquid fluids ejected from adjacent second ejection openings 82B, 82B also interfere with each other. In addition, the liquid fluids ejected from 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 all ejection openings 82A, 82B, and the structure is designed so that the tapered portion is as close as possible to each ejection opening 82A, 82B, taking into consideration the resistance when a swirling flow passes through an extremely narrow flow path (i.e., the area near the ejection openings 82A, 82B).

[0068] According to the configuration of this embodiment, the same number of second ejection openings 82B can be arranged outside the first ejection opening 82A as the number of first ejection openings 82A, thereby doubling the number of ejection openings. This makes it possible to eject a large number of streams of water containing high-concentration microbubbles.

[0069] Here, the first ejection opening 82A and the second ejection opening 82B are positioned circumferentially offset from each other so as not to lie on the same radial line with respect to the main central axis L1, thereby enabling the liquid fluid to be ejected almost uniformly and without unevenness.

[0070] Furthermore, by structuring the second guide channel section 77B to be connected to the first swirling flow forming section 78B, the structure of each part arranged in the lower member 70 does not become overcrowded, and the complexity of the shape is suppressed. Therefore, for example, it becomes possible to provide a product in which the number of ejection openings 82A and 82B in the lower member 70 is efficiently increased.

[0071] Furthermore, the microbubble generation mechanism for cleaning targets using spray according to the present invention has a small number of parts and can generate highly effective microbubbles at low cost.

[0072] Note that the configuration of the first swirling flow forming section 78A and the configuration of the second swirling flow forming section 78B are the same as the swirling flow forming section 28 in the above-described reference example 1, so their explanation will be omitted. Furthermore, the flow path of the main body according to the present invention is composed of the central flow path section 75 of this embodiment described above, 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.

[0073] Here, for example, the configuration may include a third guide channel section being further connected to the second swirling flow forming section 78B to form a third swirling flow forming section, and a number of further swirling flow forming sections may be formed by a similar structure.

[0074] Furthermore, the microbubble generation mechanism for cleaning targets by spraying according to the present invention does not necessarily have to include a gas mixer 40. This is because it is conceivable that air may flow back into the liquid fluid at the ejection openings 32, 43, 62A, 62B, 82A, and 82B.

[0075] Furthermore, the microbubble generation mechanism for cleaning targets by spraying according to the present invention may be used in dishwashers and water purifiers, and of course may be used in other applications as well. [Explanation of Symbols]

[0076] 1,2,3 Shower device (microbubble generation mechanism for cleaning the target object) 10. Handle 20A, 20B, 50A, 70A Main Unit 21 Upper member 22,42,50,70 Lower part 23 Introduction 24 Upper member side channel section 25, 55, 75 Central channel section 26,56,76 Side peripheral wall 27, 57A, 57B Guide channel section 28,58A,58B Swirling flow forming part 30 Fastening members 31 Bottom 32,43 Spout opening 40 Gas mixer 62A,62B Spout opening 77A First guide channel section 77B Second guide channel section 78A First swirling flow forming section 78B Second swirling flow forming section 82A First ejection opening 82B Second ejection opening L1 Main central axis L2 Sub-center axis α Incline angle

Claims

[Claim 1] A microbubble generation mechanism for cleaning a target by spraying a liquid fluid containing microbubbles is sprayed into the air along a predetermined spraying direction, and the liquid fluid is sprayed onto a target in the air, It has a single main body with a flow path formed inside, The aforementioned flow path is The main central axis is defined along the ejection direction, and the chamber is composed of a space whose cross-section includes a circle centered on the main central axis, and the liquid fluid flows in from outside the main body along the main central axis, Multiple first guide channel sections are connected to the side circumferential wall sections formed around the main central axis in the central channel section and are continuous with the central channel section, and are arranged radially and independently at equal intervals with respect to the main central axis, Each of the first swirling flow forming sections is continuous with the downstream end of the first guide channel section and is composed of a passage section that includes a tapered shape in which the inner diameter decreases as it moves downstream with the ejection direction as the flow direction, It is equipped with, The plurality of first swirling flow forming sections are arranged circumferentially around the central flow path section with respect to the main central axis within the single main body section, and a first ejection opening, open to the outside of the main body section, is formed at the downstream end of each first swirling flow forming section in a one-to-one correspondence with each first swirling flow forming section, so that a plurality of these first ejection openings are arranged within the single main body section. moreover, A second guide channel is connected to the side circumferential wall of a plurality of the first swirling flow forming sections, with its upstream end connected to the side circumferential wall of the first swirling flow forming section, and is positioned outside the first swirling flow forming section with respect to the main central axis, A second swirling flow forming section is formed by a passage section which is continuous with the downstream end of the second guide channel section and includes a tapered section whose inner diameter decreases as it moves downstream with the ejection direction as the flow direction, It is equipped with, At the downstream end of the second swirling flow forming section, a second ejection opening is formed that is open to the outside of the main body, and such a number of the second ejection openings are arranged in a single main body, corresponding one-to-one with the second swirling flow forming section. The flow rate per unit time of the liquid fluid ejected from the first ejection port is approximately equal to the flow rate per unit time of the liquid fluid ejected from the second ejection port. The liquid fluid introduced into the central flow channel flows into the first swirling flow forming section via the first guide channel, and a portion of the liquid fluid that has flowed into the first swirling flow forming section flows into the second guide channel and flows into the second swirling flow forming section via the second guide channel. In the first swirling flow forming section, the liquid fluid flows toward the first ejection opening, forming a swirling flow, and is ejected from the first ejection opening containing fine bubbles. In the second swirling flow forming section, the liquid fluid flows toward the second ejection opening, forming a swirling flow, and is ejected from the second ejection opening containing fine bubbles. In the swirling flow ejected into the air from the first ejection opening and the swirling flow ejected into the air from the second ejection opening, at least adjacent swirling flows interfere with each other in the air downstream of the first and second ejection openings. The swirling direction of the swirling flow in the liquid fluid flowing through the first swirling flow forming section and the second swirling flow forming section is set to the same direction and directed at the target to be sprayed, thereby cleaning the target to be sprayed in the air. Furthermore, the single main body is used as the lower member, and the upper member is further provided which is superimposed on the upper surface of the lower member, which is the upstream surface, and fastened to the lower member. An introduction section for introducing liquid fluid is provided in the center of the upper surface, which is the upstream surface of the upper member, and a circular hole-shaped upper member side flow channel is provided through the center of the upper member, communicating with the introduction section. In contrast, the lower member is provided with the central flow channel, the first guide channel, the first swirling flow forming section, the second guide channel, and the second swirling flow forming section exposed on the upper surface of the lower member, and the upper member side flow channel and the central flow channel are in communication when the upper member and the lower member are superimposed, and the first guide channel, the first swirling flow forming section, the second guide channel, and the second swirling flow forming section are covered on the lower surface which is the downstream surface of the upper member, and the inner diameter of the upper member side flow channel and the inner diameter of the central flow channel are the same, and the first ejection opening and the second ejection opening are arranged on the lower surface which is the downstream surface of the lower member. A microbubble generation mechanism for cleaning targets by spraying, characterized by the above features.

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