JP7329341B2 - discharge device - Google Patents

Description

The present invention relates to an ejection device.

Conventionally, a discharge device capable of jetting a jet stream has been proposed for the purpose of massaging a bathing person or the like. As an example, Patent Literature 1 proposes a discharge device that includes a jetting water channel for jetting a jet flow and a discharge water channel for discharging an annular film-like flow. In this ejection device, by surrounding the jet stream with an annular film of water, scattering of droplets of the jet stream is prevented.

JP-A-9-103381

In the technology disclosed in Patent Document 1, the film-like flow is annular. Therefore, as the flight distance of the film-like flow increases, the film-like flow narrows due to the influence of surface tension, and the annular film-like flow joins the inner jet flow at an early stage. For this reason, there is a problem that the area directly exposed to the injection flow is narrow.

An aspect of the present invention has been made in view of such a problem, and one of the objects thereof is a technology that can widen the range directly exposed to the jet flow while preventing the droplets of the jet flow from being scattered by the film-like flow. is to provide

A first aspect of the present invention for solving the aforementioned problems is a discharge device. A discharge device according to a first aspect includes a jet water channel capable of forwardly injecting a jet flow, and a discharge water channel capable of forwardly discharging a film-like flow passing above the jet flow. The cross section perpendicular to the direction forms a closed membrane shape.

According to the first aspect, even if the film-like flow narrows, the film-like flow does not approach the jet flow, and early merging of the film-like flow and the jet flow can be avoided. Accordingly, it is possible to widen the area directly exposed to the jet flow while preventing the droplets of the jet flow from being scattered by the film-like flow.

1 is a configuration diagram of a discharge system according to a first embodiment; FIG. 3 is another configuration diagram of the discharge system of the first embodiment; FIG. FIG. 2 is a schematic front view showing the ejection device of the first embodiment together with the peripheral structure; FIG. 2 is a schematic plan view showing the ejection device of the first embodiment together with the peripheral structure; FIG. 5A is a schematic diagram showing the operation of the ejection device of the reference embodiment, and FIG. 5B is a cross-sectional view taken along the line AA of FIG. 5A. It is a figure which shows the ejection direction and ejection direction of the ejection device of 1st Embodiment. FIG. 6 is a schematic side view showing the ejection device of the second embodiment together with the peripheral structure; FIG. 6 is a schematic front view showing the ejection device of the second embodiment together with the peripheral structure; FIG. 11 is a schematic side view showing the discharge device of the third embodiment together with the peripheral structure; FIG. 10 is a schematic front view showing the ejection device of the third embodiment together with the peripheral structure;

An example of an embodiment of the present invention will be described below. The same reference numerals are given to the same components, and overlapping descriptions are omitted. In each drawing, for convenience of explanation, some of the components are omitted or the dimensions thereof are enlarged or reduced as appropriate. The drawings should be viewed according to the orientation of the symbols. The shape referred to in this specification includes not only a shape that exactly matches the shape referred to, but also a shape that deviates due to errors such as dimensional errors and manufacturing errors.

Please refer to FIGS. 1 is a schematic side view of the ejection device 10, and FIG. 2 is also a schematic front view of the ejection device 10. As shown in FIG. The discharge device 10 of this embodiment is used in a plumbing facility 12 . The plumbing equipment 12 of this embodiment is a bathroom equipment. The plumbing equipment 12 of the present embodiment includes, in addition to the discharge device 10, a bathtub 14 and a wall 16 that partitions an indoor space serving as a bathroom space. In addition, the plumbing facility 12 includes a washing space floor adjacent to the bathtub 14, and the like. The bathtub 14 is an example of a tank body through which a film-like flow F3 (described later) discharged from the discharge device 10 passes.

The ejection device 10 of this embodiment is used in an ejection system 18 . The discharge system 18 includes a storage tank 20 for storing water, a water supply channel 22 for supplying water from the storage tank 20 to the discharge device 10, a valve device 24 and a pump 26 provided in the water supply channel 22, and a valve device 24. and a controller 28 that controls the pump 26 .

The storage tank 20 of this embodiment is a bathtub 14 that stores water. Bathtub water (not shown) in the bathtub 14 is supplied to the discharging device 10 through the water supply path 22 .

The water supply channel 22 includes an upstream water channel 22 a provided upstream from the valve device 24 and a plurality of downstream water channels 22 b and 22 c provided downstream from the valve device 24 . A pump 26 is provided in the middle of the upstream water channel 22a. The plurality of downstream water channels 22b and 22c include a jet water channel 22b that supplies water to a jet water channel 34 (described later) of the discharge device 10, and a membrane that supplies water to a discharge water channel 36 (described later) of the discharge device 10. 22c is included.

The valve device 24 can switch between communication between each of the plurality of downstream water passages 22b and 22c and the upstream water passage 22a. The valve device 24 is configured using, for example, a switching valve such as a multi-way valve or a plurality of on-off valves. The valve device 24 can, through control by the control device 28 or manual operation, perform at least a first operation mode in which both the jet flow channel 22b and the film flow channel 22c are in communication with the upstream channel 22a. At this time, by pumping the water sucked from the storage tank 20 by the pump 26, the water is supplied to the jet water channel 34 and the discharge water channel 36 of the discharge device 10 through the jet water channel 22b and the film-like water channel 22c of the water supply channel 22. be. As a result, the jet flow F<b>1 is jetted from the jet water passage 34 and the film-like flow F<b>3 is discharged from the discharge water passage 36 .

The discharge device 10 includes a device main body 32 fixed to a base 30 provided in the plumbing equipment 12 . The apparatus main body 32 of this embodiment is fixed to the base 30 using a fixing structure (not shown). This fixing structure is, for example, a screw structure, a pawl and a pawl receiver, or the like. The base 30 of this embodiment is constituted by a flange portion of the bathtub 14 provided at the peripheral edge of the top opening of the bathtub 14 .

The discharge device 10 includes a jet water channel 34 and a discharge water channel 36 formed inside the device main body 32 . In this embodiment, water is supplied to the jet water passage 34 and the discharge water passage 36 from below in the vertical direction through the water supply passage 22 . An injection hole 38 is formed at the downstream end of the injection water passage 34 . A discharge hole 40 is formed at the downstream end of the discharge water channel 36 . In this specification, the direction along the center line CL2 (see FIG. 6) of the discharge hole 40 is referred to as the front-rear direction X, and the horizontal direction orthogonal to the front-rear direction X is referred to as the left-right direction Y in plan view. Of the two sides in the front-rear direction X, the discharge direction of the discharge water channel 36 is called the front side (front side), and the opposite side is called the rear side.

The injection hole 38 opens in the front part of the device main body 32 . The discharge device 10 of the present embodiment includes a plurality of (two in the illustrated example) jet water passages 34 . The injection holes 38 of the plurality of injection water passages 34 are provided at positions spaced apart in the left-right direction Y when viewed from the front. A discharge hole 40 of the discharge water channel 36 opens in the front part of the device main body 32 . The discharge hole 40 has a slit shape extending in the left-right direction Y. As shown in FIG. Here, “front view” means viewing from the front side in the front-rear direction X, and is synonymous with viewing from the viewpoint in FIG. 2, for example.

The injection hole 38 is provided below the discharge hole 40 in a front view. The injection holes 38 of the present embodiment are provided at positions vertically overlapping the discharge holes 40 in a front view. Further, the injection hole 38 of the present embodiment is provided at a position within a range Sa in the left-right direction Y in which the discharge hole 40 is provided when viewed from the front. This means that the injection hole 38 is not provided at a position protruding outside the range Sa.

Please refer to FIGS. 1, 3 and 4. FIG. The jet water channel 34 can jet the water supplied from the jet water channel 22b of the water supply channel 22 as the jet flow F1. Each figure shows the injection range of the injection flow F1. The jet water passage 34 can jet the jet flow F1 forward from the jet hole 38 . The injection flow F1 of this embodiment is a water jet F2. The term "water jet" as used herein includes not only a single-phase flow jet of water, but also a multi-phase flow jet in which water is a continuous phase and air is dispersed.

The discharge water channel 36 can discharge water supplied from the film flow channel 22c of the water supply channel 22 as a film flow F3. Each figure shows the ejection range of the film-like flow F3. The illustrated example shows a state in which the jet flow F1 collides with the film-like flow F3 (see range S1). The discharge water channel 36 can discharge the film-like flow F3 passing above the jet flow F1 so as to project forward from the discharge hole 40 .

The film-like flow F3 can limit the scattering range of the droplets by interrupting the flow of the droplets of the jet flow F1. In this embodiment, droplets are generated by collision between the injection flow F1 of the water jet F2 and an object such as a user. In this embodiment, the discharge water passage 36 discharges the film-like flow F3 so as to hit the user's neck, and the jet water passage 34 injects the jet flow F1 so as to hit the user's shoulder below the user's neck. As a result, it is possible to restrict the scattering of the droplets of the jet flow F1 above the film-like flow F3, and prevent the splashing of the droplets on the user's face above the film-like flow F3.

The water jet passage 34 of this embodiment injects the water jet F2 so that the direction of flow and the flow rate are constant over time. Further, the discharge water passage 36 of the present embodiment discharges the film-like flow F3 such that the flow direction and the flow rate are constant over time. "Constant over time" here means that when a constant flow rate of water is supplied to the water channel, the flow direction and flow rate when exiting the water channel do not change much over time. means that

The jet flow F1 and the film-like flow F3 are sprayed from the back side on the user's body, particularly the user's neck, shoulders, etc., who are in a sitting posture while bathing in the bathtub 14 . Thereby, the user can be provided with a massage effect and a relaxing effect. In addition, by using hot water for the jet flow F1 and the film-like flow F3, it is possible to provide the user with a warm bath effect and a heat retaining effect. In addition, by using the jet flow F1 and the film-like flow F3, it is possible to give the user different feeling of hitting.

Here, the film-like flow F3 forms an end-ended film in a cross section orthogonal to the flow direction. The hatching in FIG. 3 indicates the cross section of the film-like flow F3 orthogonal to the flow direction when exiting the discharge water channel 36 . Here, the term "film-like with ends" means a film-like shape in which both ends 50a and 50b are separated from each other in a cross section perpendicular to the flow direction. It can be said that the film-like flow F3 has a non-circular shape in this cross section. This condition should be satisfied at least in the cross section perpendicular to the flow direction when exiting the discharge water channel 36 . It can also be said that the film-like flow F3, when exiting the discharge water passage 36, forms a film-like shape with ends in a cross section perpendicular to the center line CL2 (see FIG. 6) of the discharge hole 40. FIG. The film-like flow F3 of the present embodiment has a straight-ended film shape in such a cross section, but it may have a curved shape such as an arc shape, and its specific shape is not particularly limited.

The film-like flow F3 is discharged from the discharge water channel 36 so as to form a parabolic shape extending downward as the distance from the discharge water channel 36 increases in a side view. The jet flow F1 of the water jet is jetted from the water jet passage 34 so as to form a parabola that is gentler than the parabola drawn by the film-like flow F3 or a straight line, as viewed from the side. Further, the film-like flow F3 is discharged from the discharge water passage 36 so as to pass only above the jet flow F1 until it merges with the jet flow F1 or is received by the water in the bathtub 14 in a side view. Here, "side view" means viewing from the horizontal direction Y, and is synonymous with viewing from the viewpoint in FIG. 1, for example.

Effects of the ejection device 10 described above will be described.

Please refer to FIG. FIG. 5 shows a discharge device 110 of a reference form. The discharge device 110 of the reference embodiment includes a jet water channel 134 for jetting a jet flow F1 and a discharge water channel 136 for jetting an annular film flow F3. In this figure, for convenience of explanation, an example in which water is discharged downward from the jet water channel 134 and the discharge water channel 136 is shown.

The discharge device 110 of the reference embodiment differs from the discharge water passage 36 of the embodiment in that it discharges an annular film-like flow F3. In this case, when the film-like flow F3 narrows due to the effect of surface tension as the flight distance of the film-like flow F3 increases, the annular film-like flow F3 deforms so as to approach the inner jet flow F1. . As a result, the annular film flow F3 joins the injection flow F1 early (see range S2). In particular, when the jet flow F1 is a water jet, when the jet flow F3 and the jet flow F1 are combined with the flow F4, the scattering of the droplets cannot be interrupted by the film flow F3, and some users may feel discomfort. I am afraid to feel.

(A) In this regard, the discharge water passage 36 of the present embodiment discharges a film-like flow F3 having an end film. Accordingly, even if the film-like flow F3 narrows, the film-like flow F3 does not approach the injection flow F1, and early merging of the film-like flow F3 and the injection flow F1 can be avoided. Along with this, the film-like flow F3 prevents the droplets of the jet F1 from being scattered, and the range directly exposed to the jet F1 can be widened.

In addition, when the jet flow F1 is the water jet F2, the water jet F2 can be directly applied over a wide range, while the film-like flow F3 can block the scattering of droplets generated in the exposed area. Therefore, for example, while the user's body is directly exposed to the water jet F2 over a wide area, the film-like flow F3 can prevent droplets from splashing onto the user's face, thereby providing the user with a good feeling of use.

Other features of the ejection device 10 will now be described.

Please refer to FIG. The ejection range of the jet flow F1 is set so as to be within the ejection range of the film-like flow F3 when viewed from the front. This injection range is set so as not to protrude from this ejection range when viewed from the front.

The injection range here refers to the range in which the jet flow F1 actually passes from the time it exits the water jet passage 34 until it hits the film-like flow F3 or the fixed structure 42, and is represented by the trajectory drawn by the jet flow F1. be. Further, the discharge range refers to the range through which the film-like flow F3 actually passes from the discharge water channel 36 to the time it hits the fixed structure 42, and is represented by the trajectory drawn by the film-like flow F3. Both are based on the premise that there is no object to be showered with the film-like flow F3 or the jet flow F1, and a constant flow rate of water is supplied to the water channel. The "object" here is a user in this embodiment. The "fixed structure" here refers to a structure around the jet flow F1 or the film-like flow F3, which is the bathtub 14 in this embodiment.

(C) As a result, forward and upward scattering of the droplets of the jet flow F1 is intercepted by the film-like flow F3, so that the scattering of the droplets over a wide range can be reliably prevented.

Please refer to FIG. The jetting direction D1 of the jetting water channel 34 is set downward from the discharging direction D2 of the discharging water channel 36 in a side view. The injection direction D1 here refers to the direction along the center line CL1 of the injection hole 38 of the water injection passage 34 . The discharge direction D2 refers to the direction along the center line CL2 of the discharge hole 40 of the discharge water channel 36 . Both the ejection direction D1 and the ejection direction D2 are forward.

Explain this advantage. Since the jet flow F1 tends to have stronger momentum than the film-like flow F3, it tends to fly straighter than the film-like flow F3. Therefore, when the jetting direction D1 and the discharging direction D2 are parallel, the jetting flow F1 (the jetting flow F1 of the two-dot chain line) is likely to collide with the parabolic film flow F3 at a point P1 near the water jetting passage 34. Become.

(B1) On the other hand, according to the present embodiment, compared to the case where the injection direction D1 and the discharge direction D2 are parallel, the injection flow is caused at the point P1 near the injection water passage 34 with respect to the parabolic film flow F3. F1 crashes can be avoided. Along with this, it becomes easier for the jet flow F1 to reach places far from the jet water passage 34, and it becomes easier to further widen the range where the jet flow F1 is directly exposed. In this embodiment, an example is shown in which the jet flow F1 collides with the film-like flow F3 at a point P2 far from the jet water passage 34, but the water in the bathtub 14 may receive the jet flow F1.

(B2) In addition, compared to the case where the ejection direction D1 and the ejection direction D2 are parallel, it becomes easier for the jet flow F1 to reach locations that the film-like flow F3 cannot reach. This assumes, for example, a case where the jet flow F1 reaches the user's back or the like, which is not reached by the film-like flow F3.

The water jet passage 34 injects the jet flow F1 so as to reach forward from the intersection point P1 between the horizontal line passing through the outlet of the water jet passage 34 (F1 in FIG. 6) and the film flow F3. It can also be taken as Further, as shown in FIGS. 3 and 4, the injection directions D1 of the adjacent water injection passages 34 are set so as to approach each other toward the front side.

(Second embodiment)
7 and 8 are referred to. The discharge device 10 of the present embodiment differs from that of the first embodiment in the jet water passage 34 . The device body 32 includes a fluidic element 44 that is incorporated into the device body 32 . A jet water passage 34 is provided inside the fluid element 44 .

The jet water channel 34 of the fluid element 44 can jet the water supplied from the jet water channel 22b of the water supply channel 22 as the jet flow F1. The water jet passage 34 is capable of injecting a water jet F2 as the jet flow F1 so that the direction of flow of the water jetting out from the water jet passage 34 changes with time. The water jet passage 34 can temporally change the flow direction of the jet flow F1 when it emerges from the water jet passage 34 without changing the direction of the apparatus main body 32 . The water jet passage 34 of the present embodiment can be changed with time so that the direction of flow when jumping out of the water jet passage 34 is swung in the left-right direction Y. As shown in FIG. As a result, a wave-like jet flow F<b>1 is radially jetted from the jet water passage 34 . In FIG. 8, an injection range S3 of the wavy injection flow F1 is indicated by a dashed line.

A specific example of the fluid element 44 for realizing such a function is not particularly limited. For example, as described in Japanese Unexamined Patent Application Publication No. 2008-517762, a fluid element 44 capable of swinging the flow direction of the jet flow F1 by causing a pair of jet streams to collide in a confluence chamber provided in the jet water passage 34 is provided. may be used. In addition, the fluid element 44 that can swing the flow direction of the jet F1 using Karman vortices may be used, or the flow direction of the jet F1 can swing using the Coanda effect. A fluidic device 44 may be used.

When the direction of flow of the water jet F2 changes with time in this way, the portion exposed to the water jet F2 also changes with time. For this reason, compared to the case where the direction of flow is constant over time, the water film formed at the location exposed to the water jet F2 becomes thinner, and droplets of the water jet F2 are more likely to scatter from there.

(D) According to the present embodiment, even in such a situation where droplets of the water jet F2 are likely to scatter, the film-like flow F3 can block the droplets of the water jet F2, effectively preventing the droplets from scattering. can be prevented.

In particular, when the flow direction of the water jet F2 changes over time, the injection range of the water jet F2 becomes wider than when the flow direction is constant over time. Even when the injection range of the water jet F2 is widened in this way, by forming the film-like flow F3 in the shape of a film with ends, it is possible to avoid merging with the film-like flow F3 and reduce the range where the jet flow F1 can be directly bathed. can be wider.

Also in this embodiment, as in the first embodiment, the jetting direction D1 of the jetting water passage 34 is set downward from the jetting direction D2 of the jetting water passage 36 in a side view. Therefore, similar to the first embodiment, the effects (B1) and (B2) described above can be obtained.

Also in this embodiment, as in the first embodiment, the injection range S3 of the jet flow F1 is set so as to fall within the ejection range of the film-like flow F3. Therefore, the aforementioned effect (C) can be obtained as in the first embodiment.

(Third Embodiment)
9 and 10 are referred to. The discharge device 10 of the present embodiment differs from that of the first embodiment in the jet water passage 34 . The device main body 32 includes a mist nozzle 46 incorporated in the device main body 32 . A jet water passage 34 is provided inside the mist nozzle 46 .

The jet water channel 34 of the mist nozzle 46 can mist the water supplied from the jet water channel 22b of the water supply channel 22 and can jet the mist flow F5 as the jet flow F1. The mist flow F5 here refers to a plurality of mist flows. In this figure, the injection range of the mist flow F5 is indicated by a dashed line. The jet water passage 34 can jet the mist flow F5 so as to spread radially from the jet hole 38 . The mist nozzle 46 of this embodiment is a one-fluid nozzle, but may be a two-fluid nozzle. Since the one-fluid nozzle does not require a compressor other than the pump 26, the size and cost of the discharge system 18 can be reduced.

In the first embodiment, droplets generated by collision between the jet flow F1 of the water jet F2 and an object such as a user have been described as the droplets of the jet flow F1 to be blocked by the film-like flow F3. In the present embodiment, the mist of the mist flow F5 constitutes the droplets of the jet flow F1. The film-like flow F3 can limit the scattering range of the mist by interrupting the flow of droplets of the jet flow F1, that is, the flow of mist.

Effects of the present embodiment will be described. The discharge water channel 36 of the present embodiment also discharges a film-like flow F3 having an end film. Therefore, the aforementioned effect (A) can be obtained as in the first embodiment.

Further, when the jet flow F1 is the mist flow F5, the film-like flow F3 can block scattering of the mist flow F5 while being directly exposed to the mist flow F5 over a wide range. Therefore, for example, while a wide range of the body is directly exposed to the mist flow F5, scattering of the mist flow F5 to the user's face can be prevented by the film-like flow F3, and a good usability can be given to the user.

Also in this embodiment, as in the first embodiment, the jetting direction D1 of the jetting water passage 34 is set downward from the jetting direction D2 of the jetting water passage 36 in a side view. Therefore, similar to the first embodiment, the effects (B1) and (B2) described above can be obtained.

Also in the present embodiment, the injection range of the jet flow F1 (mist flow F5) is set so as to be within the ejection range of the film-like flow F3 when viewed from the front. When the jet flow F1 is the mist flow F5, the “injection range” is defined as the range in which the jet flow F1 actually reaches the film-like flow F3 or the fixed structure 42 from when it emerges from the jet water passage 34 to when it hits the fixed structure 42, based on the following assumptions. refers to the range that passes through This premise is that there is no object to be showered with the film-like flow F3 or the jet flow F1, a constant flow rate of water is supplied to the jet water passage 34, and there is no wind. In the present embodiment as well, the aforementioned effect (C) can be obtained as in the first embodiment.

Another modified example of each component will be described.

A specific example of the plumbing equipment 12 is not particularly limited, and may be, for example, kitchen equipment, washbasin equipment, toilet equipment, and the like. A specific example of the bathtub 14 of the plumbing equipment 12 is not particularly limited. A specific example of the base 30 of the plumbing equipment 12 is not particularly limited, and for example, it may be a wall body that partitions an indoor space.

The reservoir 20 of the discharge system 18 is not limited to the bathtub 14 of the plumbing equipment 12, and may be provided separately from the bathtub 14, for example. Also, the valve device 24 of the discharge system 18 may be omitted.

In addition to the first operation mode, the valve device 24 may be capable of performing the following second operation mode and third operation mode. In the second operation mode, the water sucked from the storage tank 20 is pumped by the pump 26 so that the water is supplied only to the jet water channel 34 of the discharge device 10 through the jet water channel 22b of the water supply channel 22 . As a result, only the injection flow F1 is injected from the injection water passage 34 . In the case of the third operation mode, the water sucked from the storage tank 20 is pumped by the pump 26, so that the water is supplied only to the discharge water channel 36 of the discharge device 10 through the film-like water channel 22c of the water supply channel 22. As a result, only the film-like flow F3 is discharged from the discharge water passage 36 .
・Second operation mode: A mode in which the injection flow channel 22b and the upstream water channel 22a are communicated and the communication between the film flow channel 22c and the upstream water channel 22a is cut off ・Third operation mode: The film flow channel 22c and the upstream water channel 22a, and cuts off the communication between the jet stream channel 22b and the upstream channel 22a.

A specific example of the ejection device 10 is not particularly limited, and for example, it may be configured as a shower device, a faucet device, or the like.

An example has been described in which the base 30 to which the device main body 32 is fixed is the rim portion of the bathtub 14 . The base 30 may be configured by the inner peripheral wall portion of the bathtub 14 provided below the top opening of the bathtub 14 , or may be configured by the wall body 16 of the plumbing equipment 12 . This means that the film-like flow F3 or the jet flow F1 may be discharged from the apparatus main body 32 fixed to the inner peripheral wall portion of the bathtub 14 or the wall body 16 .

Although an example in which the jet water channel 34 and the discharge water channel 36 are formed in the common device main body 32 has been described, they may be formed in separate device main bodies 32 .

The jetting direction D1 of the water jet passage 34 may be set parallel to the jetting direction D2 of the jetting hole 40, or may be set upward from the jetting direction D2.

The ejection range of the jet flow F1 may protrude outside the ejection range of the film-like flow F3 when viewed from the front.

When the fluidic element 44 is used as in the second embodiment, the specific example is not particularly limited as long as the fluidic element 44 can temporally change the flow direction of the jet flow F1. For example, a flow having an axial velocity component along a given axis and a radial velocity component perpendicular to the axis, where the radial velocity component changes in time to rotate about the axis. may be used. As a result, a spiral jet flow F1 is radially jetted from the water jet passage 34 .

The water jet passage 34 of the second embodiment has explained an example in which the water jet F2 is jetted such that the flow direction changes with time. In addition, the water jet passage 34 may inject the water jet F2 so that the flow rate of the jet water passage 34 changes with time. This can be realized, for example, by providing an air bubble supply unit capable of intermittently supplying air bubbles to the water flowing through the jet water passage 34 . As a result, a region with a low flow rate and a region with a high flow rate can be formed in the flow direction of the water jet F2.

In this case, the thickness of the water film formed at the location exposed to the water jet changes with time. Therefore, if the water jet F2 with a large flow rate is applied at the timing when the thickness of the water film becomes thin, the droplets of the water jet F2 are likely to scatter from there.

According to this modification, as in the case of (D) above, even under conditions in which droplets of the water jet F2 are likely to scatter, the film-like flow F3 can block the droplets of the water jet F2, effectively preventing the droplets from scattering. can be effectively prevented.

In order to obtain the same effect, the water jet passage 34 may jet the jet flow F1 so that the flow rate when it jumps out of the water jet passage 34 changes with time between zero and a positive value. The injection water passage 34 intermittently injects the injection flow F1. This can be realized, for example, by providing a plurality of injection holes 38 at the downstream end of the water injection passage 34 and opening and closing the plurality of injection holes 38 with an impeller arranged in the water injection passage 34 (Japanese Patent Laid-Open No. 2014-140599). (see publication).

The embodiments and modifications of the present invention have been described in detail above. All of the above-described embodiments and modifications merely show specific examples for carrying out the present invention. The contents of the embodiments and modifications do not limit the technical scope of the present invention, and many design changes such as alterations, additions, and deletions of constituent elements are possible without departing from the spirit of the invention. In the above-described embodiment, the description of "embodiment" is added to emphasize the content that allows such design change, but the design change is permitted even for content that does not have such a description. The hatching attached to the cross section of the drawing does not limit the material of the hatched object. Any combination of the above components is also effective as an aspect of the present invention.

Generalizing the inventions embodied by the above embodiments and modifications leads to the following technical ideas. Hereinafter, description will be made using the embodiments described in the problems to be solved by the invention.

In the discharge device of the second aspect, in the first aspect, the water jet passage may be capable of injecting a water jet such that the flow direction or flow rate when exiting the water jet passage changes with time. According to this aspect, even in a situation where the droplets of the water jet are likely to scatter, the film-like flow can block the droplets of the water jet and effectively prevent the droplets from scattering.

In the discharge device of the third aspect, in the first or second aspect, the jetting direction of the water jetting channel may be set downward from the jetting direction of the water jetting channel in a side view. According to this aspect, it becomes easier for the jet flow to reach a place far from the jet water channel, and it becomes easier to further widen the range where the jet flow is directly exposed.

In any one of the first to third aspects, the ejection device of the fourth aspect may be such that the ejection range of the jet flow is set so as to fall within the ejection range of the film-like flow when viewed from the front. According to this aspect, by blocking forward and upward scattering of the droplets of the jet flow by the film-like flow, it is possible to reliably prevent the droplets from scattering over a wide range.

F1... Jet flow, F2... Water jet, F3... Film flow, 10... Discharge device, 34... Jet water channel, 36... Discharge water channel.

Claims (4)

a jet water channel capable of jetting the jet flow forward;
a discharge water passage capable of discharging forward a film-like flow passing above the jet flow,
The jet water channel and the discharge water channel are provided at a position higher than the upper surface of the tank body through which the film-like flow passes,
The film-like flow is an ejection device in which a cross section perpendicular to the flow direction has a shape of a film with ends. 2. The discharge device according to claim 1, wherein the water jet passage is capable of injecting a water jet such that the flow direction or the flow rate when exiting the water jet passage changes with time. The ejection device according to claim 1 or 2, wherein the ejection direction of the water jet passage is set downward from the ejection direction of the water discharge passage in a side view. 4. The ejection device according to any one of claims 1 to 3, wherein the ejection range of the jet flow is set so as to be within the ejection range of the film-like flow when viewed from the front.

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