WO2016151941A1

WO2016151941A1 - Water discharging device

Info

Publication number: WO2016151941A1
Application number: PCT/JP2015/082762
Authority: WO
Inventors: 雄大朗大原; 健介村田; 政信金城; 仁中尾
Original assignee: Toto株式会社
Priority date: 2015-03-26
Filing date: 2015-11-20
Publication date: 2016-09-29
Also published as: CN107075844A; CN107075844B; JPWO2016151941A1; US20180044898A1; JP6641674B2

Abstract

A water discharging device 2 that is disposed to ensure a prescribed open space with a bowl 3 and that discharges water toward the bowl 3 comprises a water discharging unit 13 that emits water droplets from a water discharging port 13a so as to spread out at a prescribed angle θ, wherein the water discharging unit 13 is set to discharge water at a prescribed flow rate. The water droplets emitted from the water discharging unit 13 satisfy the conditional equation of Y ≤ 9300 × X^(−1.5), where X is the average flow speed (m/sec) and Y is the average particle size (μm).

Description

Water discharge device

The present invention relates to a water discharge device, and more particularly to a water discharge device that discharges water so that water spreads from a water discharge port.

Conventionally, various attempts have been made to realize water saving in a water discharge device. Among them, spray water discharge (water discharge in which water spreads from the water discharge port) that discharges water in a mist form at a low flow rate is effective for saving water. This spray water discharge is useful in that water can be discharged over a wide range while realizing water saving.

For example, Patent Document 1 discloses a configuration of a nozzle that performs spray water discharge as described above. For example, Patent Document 2 discloses a hand-washing machine that sprays and discharges electrolyzed water having a sterilizing function to sterilize hands.

JP 2004-050121 A JP 11-241381 A

Although the spray water discharge as described above is effective for water saving, the water flow is likely to occur because the flow velocity is larger than that of general water discharge (for example, foam water discharge or shower water discharge). For this reason, the inventor of the present invention has clarified the parameters involved in water splashing in spray water discharge, and has considered realizing spray water discharge that does not cause water splash.

The present invention has been made to solve the above-described problems, and an object thereof is to appropriately suppress water splashing in a water discharge device that discharges water so that water spreads from a water discharge port.

In order to achieve the above object, the present invention is a water discharge device that is installed with a predetermined open space between the water receiving portion and discharges water toward the water receiving portion, and is provided with a predetermined amount from the water outlet. A water discharge unit that sprays water droplets so as to spread at an angle, and has a water discharge unit set to discharge a predetermined flow rate, and the water droplets ejected from the water discharge unit have an average flow velocity X (m / m sec) and the average particle diameter Y (μm) satisfy the following conditional expression (1).
Y ≦ 9300 × X ^(-1.5) Formula (1)

In the present invention configured as described above, in the water spouting device that ejects water droplets toward the water receiving portion so as to spread at a predetermined angle from the water spouting port, the average flow velocity and the average particle diameter of the water droplets ejected from the water spouting portion. And satisfying the above conditional expression (1), it is possible to appropriately suppress water splashing due to water droplets ejected from the water discharge section while ensuring water saving and water discharge over a wide range.

In the present invention, preferably, the average flow velocity X and the average particle diameter Y of the water droplets ejected from the water discharger further satisfy the following conditional expression (2).
Y ≧ −360 × X + 1500 Formula (2)
In the present invention configured as above, since the average flow velocity and the average particle diameter of the water droplets ejected from the water discharger satisfy the above conditional expression (2), appropriate cleaning performance by water discharge of the water discharger (Hand washing performance, etc.) can be ensured.

In this invention, Preferably, the average flow velocity X of the water droplet injected from the water discharging part is 1.7 (m / sec) or more.
In the present invention configured as described above, since the average flow velocity of the water droplets ejected from the water discharge unit is set to 1.7 (m / sec) or more, the water droplets are ejected so as to spread at a predetermined angle from the water discharge port. It is possible to appropriately realize the water discharge form.

In this invention, Preferably, the average particle diameter Y of the water droplet injected from the water discharging part is 35 (micrometers) or more.
In the present invention configured as described above, since the average particle diameter of the water droplets ejected from the water discharger is 35 (μm) or more, the water droplets ejected from the water discharger can be appropriately lowered without floating. it can. Thereby, the water droplet injected from the water discharging part can be appropriately made to reach the object such as the user's hand that is presented toward the water discharging part, for example.

In this invention, Preferably, the average particle diameter Y of the water droplet injected from the water discharging part is 9000 (micrometers) or less.
In the present invention configured as described above, since the average particle diameter of the water droplets ejected from the water discharger is set to 9000 (μm) or less, it is appropriate that the water droplets ejected from the water discharger break up in the middle. Can be suppressed. Thereby, it becomes easy to control to suppress water splash.

In the present invention, preferably, the water discharger ejects water droplets so as to spread at an angle of 40 to 50 degrees as a predetermined angle.
In the present invention configured as described above, the angle (discharge angle) corresponding to the range when water is discharged from the water discharge port is set to 40 to 50 degrees. It can be covered and the hand washing performance can be improved.

According to the present invention, in a water discharge device that injects water droplets so as to spread from the water outlet, water splash can be appropriately suppressed by injecting water droplets having an appropriate flow velocity and particle diameter. .

It is the perspective view which looked at the hand-washing machine which applied the water discharging apparatus by embodiment of this invention from diagonally upward. It is a figure for demonstrating the structure of the water discharging apparatus by embodiment of this invention concretely, FIG. 2 (A) is the perspective view which looked at this water discharging apparatus from diagonally downward, FIG.2 (B) is It is sectional drawing which looked at this water discharging apparatus along the IIB-IIB line | wire in FIG. 2 (A). It is a longitudinal cross-sectional view of this water discharging part for demonstrating the principle of the spray water discharging of the water discharging part by embodiment of this invention. It is a whole block diagram of the measurement system used in order to measure water splash in the embodiment of the present invention. FIG. 5A and FIG. 5B are diagrams illustrating an example of measurement results obtained by the measurement system according to the embodiment of the present invention. 6 (A) and 6 (B) are diagrams showing other examples of measurement results obtained by the measurement system according to the embodiment of the present invention. It is explanatory drawing about the upper limit boundary line of the average flow velocity and average particle diameter of the water droplet injected from the water discharging apparatus by embodiment of this invention. It is explanatory drawing about the lower limit boundary line of the average flow velocity of the water droplet injected from the water discharging apparatus by embodiment of this invention, and an average particle diameter. It is a figure which shows the water discharging form by the said water discharging apparatus in the case of changing variously the flow volume applied to the water discharging apparatus by embodiment of this invention. It is explanatory drawing about the suitable range of the average flow velocity and average particle diameter of the water droplet injected from the water discharging apparatus by embodiment of this invention. It is the perspective view which looked at the kitchen which applied the water discharging apparatus by the modification in embodiment of this invention from diagonally upward.

Hereinafter, a water discharge device according to an embodiment of the present invention will be described with reference to the accompanying drawings.

<Device configuration>
First, with reference to FIG. 1 thru | or FIG. 3, the structure of the water discharging apparatus by embodiment of this invention is demonstrated.

FIG. 1 is a perspective view of a hand basin to which a water discharge device according to an embodiment of the present invention is applied, viewed obliquely from above. As shown in FIG. 1, the hand-washing machine 1 mainly includes a water discharge device 2 that performs water discharge (spray water discharge / mist water discharge) in a mist shape so that water spreads from a water discharge port as indicated by a symbol M. A bowl 3 serving as a water receiving portion that receives water discharged from the water discharging device 2 and drains it from a drain port (not shown).

FIG. 2 is a diagram for specifically explaining the configuration of the water discharger according to the embodiment of the present invention. 2A is a perspective view of the water discharger according to the embodiment of the present invention as seen obliquely from below, and FIG. 2B shows the water discharger along the line IIB-IIB in FIG. 2A. FIG.

2A and 2B, the water discharge device 2 has a water discharge pipe 11 that is a curved tubular member. The tip of the water discharge pipe 11 is covered with a nozzle-shaped water discharge unit 13 configured to perform spray water discharge (mist water discharge) in which water spreads at a predetermined angle from the water discharge port 13a, and infrared rays. A sensor 14 for detecting a detected object is disposed, and a flow path 15 that is connected to the water discharge unit 13 and supplies water to the water discharge unit 13 is provided inside the water discharge pipe 11. The water discharge device 2 detects an object to be detected such as a human body using the sensor 14 and switches between executing and stopping water discharge from the water discharge unit 13.

Next, with reference to FIG. 3, the principle of the spray water discharge of the water discharge part 13 by this embodiment is demonstrated. FIG. 3 is a schematic diagram showing an enlarged vertical section of the water discharger 13 viewed along the direction of water flow.

As shown in FIG. 3, in the water discharge part 13, the water flowing in from the inlet 13 b provided at the upper end part causes a straight flow (see arrow A <b> 11) in the internal flow path 13 d and the internal flow path 13 d. A swirling flow (see arrow A12) is generated in the internal flow path 13d by the water flowing in from the slit portion 13c formed on the outer peripheral surface of the upper end portion. By such a synergistic effect of the straight flow and the swirl flow, the spray water discharge is performed in a full cone shape from the water discharge port 13a at the lower end of the internal flow path 13d. Specifically, water is intermittently discharged over a range larger than the cross-sectional area (opening diameter) of the water discharge port 13a, in other words, water droplets are ejected. In this case, as shown in FIG. 3, water spreads and is discharged from the water outlet 13a at a predetermined discharge angle θ. For example, the discharge angle θ may be set to 40 to 50 degrees, and the entire hand of the user may be covered with the spray water discharged from the water discharge unit 13.

As described above, in the present specification, the term “spray water discharge” means that water is intermittently discharged so as to spread from the water discharge port 13a of the water discharge unit 13 at a predetermined angle θ, in other words, water droplets are discharged. It shall mean that it is jetted.

In addition, since the spout 13a of the spout unit 13 has a smaller cross-sectional area than a spout of a general spout unit (for example, a spout unit that performs foam water discharge or shower water discharge), the resistance is strong and a pressure reducing action is generated. Accordingly, at least one of a constant flow valve, a pressure regulating valve, and a constant pressure valve (not shown in FIG. 2) is provided on the upstream side of the flow path 15 of the water discharge device 2 described above, and a predetermined flow rate and / or a water discharge unit 13 is provided. It is preferable to supply water of a predetermined pressure. By appropriately adjusting these valves, each of the flow velocity and the particle diameter (strictly speaking, the average flow velocity and the average particle diameter) in the spray water discharged from the water discharge section 13 is set to a desired value.

Moreover, in the above-mentioned example, although the water discharging apparatus 2 detected the to-be-detected object, such as a human body, using the sensor 14, the automatic water discharging apparatus which switched the water discharge and water discharge stop automatically was shown (refer FIG. 2). The present invention is not limited to application to such an automatic water discharge device, but can also be applied to a water discharge device that manually stops water discharge and stops water discharge.

Next, the flow rate and particle diameter of the spray water discharged by the water discharger 13 of the water discharge device 2 in the embodiment of the present invention will be described. Specifically, the average flow velocity and the average particle diameter of water droplets to be ejected from the water discharger 13 to be applied to the water discharge device 2 according to the present embodiment will be described. The inventor of the present invention attempted to elucidate the range of the average flow velocity and the average particle diameter of water droplets to be ejected from the water discharge unit 13 of the water discharge device 2 by performing various measurements as described below.

Here, for the “average flow velocity” of the water droplets ejected from the water discharge unit 13 of the water discharge device 2, the average flow velocity at a position 100 (mm) away from the water discharge port 13 a of the water discharge unit 13 is used. The “average flow velocity” of the water droplets corresponds to the moving speed of the water droplets. On the other hand, the “average particle size” of the water droplets ejected from the water discharge unit 13 of the water discharge device 2 is the Sauter average value (total volume / total volume) based on the particle size distribution obtained by the Franchohel analysis method using a He—Ne laser. Total surface area) is used. The “average particle diameter” of the water droplet corresponds to the diameter of the water droplet.
The reason for using such “average flow velocity” and “average particle diameter” is that the flow speed and particle diameter of water droplets ejected from the water discharger 13 are distributed and not uniform.

(1) Upper limit boundary line of flow velocity and particle diameter First, the upper limit boundary line of the average flow velocity and the average particle diameter of water droplets ejected from the water discharger 13 of the water discharge device 2 according to the present embodiment will be described. This upper limit boundary line is determined from the viewpoint of suppressing water splash due to water droplets ejected from the water discharger 13 of the water discharger 2 according to the present embodiment.

FIG. 4 schematically shows an overall configuration diagram of a measurement system used to measure water splash in the embodiment of the present invention.

As shown in FIG. 4, the measurement system 50 ejects a water droplet WD and collides with a water discharge device 51 that can set various flow rates and particle diameters of the water droplet WD and the water droplet WD ejected from the water discharge device 51. A ground glass 52, a scale 53 placed on the ground glass 52, a high-speed camera 54 that captures at least a range including the surface of the ground glass 52 on which the water droplet WD collides, and light is irradiated toward the ground glass 52 from above. A light 56 that emits light toward the ground glass 52 from below, and a PC (personal computer) 57 that receives image data taken by the high-speed camera 54 and processes the image data.

Specifically, the ground glass 52 has a size of 300 (mm) × 300 (mm) × 5 (mm). Further, the water discharge port of the water discharge device 51 and the surface of the ground glass 52 are separated from each other by 100 (mm). The high-speed camera 54 performs high-speed shooting at 10,000 (frames / second) at a resolution of 1280 (pixels) × 800 (pixels). Furthermore, adjusting the pressure and flow rate of the water supplied to the water discharge device 51, changing the opening diameter of the water discharge port applied to the water discharge device 51, and changing the width of the slit applied in the water discharge device 51. As a result, the flow velocity and particle diameter of the water droplet WD ejected from the water discharge device 51 are changed. In addition, the incident angle of the water droplet WD ejected from the water discharging device 51 to the ground glass 52 is assumed to be constant.

Here, in this embodiment, the water film WF is formed on the ground glass 52, and the water splash when the water droplet WD collides with the water film WF is measured. This is not a hand in the dry state at the beginning of hand washing (that is, a state where no water film is formed on the surface of the hand), but a hand in a wet state after the middle of hand washing (that is, a water film is formed on the surface of the hand). In this case, the hand in the wet state is simulated by the ground glass 52 on which the water film WF is formed, and the water splash generated in the hand in the wet state is examined.

In addition, water splashing is more likely to occur in the dry state than in the wet state. The reason for this is as follows. When the collision object is in a dry state, that is, when a water film is not formed on the surface of the collision object, the frictional force between the water and the collision object, the water adsorption force, and the water surface tension are mainly used. By working, water splash is less likely to occur. On the other hand, when the collision object is in a wet state, that is, when a water film is formed on the surface of the collision object, the frictional force between water and the collision object (including the water film) is small. The pressure generated at the time of collision escapes to the outside air side (low pressure side), and the force that lifts the water film generated at this time is greater than the surface tension, so that the water film can rebound and water Bouncing easily occurs.

Next, a procedure for measuring water splash according to the present embodiment will be described. First, the water film WF is formed on the ground glass 52. In this case, since the ground glass 52 is hydrophilic, the water film WF is formed only by flowing water on the surface. Next, water droplets WD are ejected from the water discharge device 51 toward the ground glass 52. In this case, a slit of 5 (mm) × 10 (mm) is applied to the water discharge device 51 in order to adjust the focus on the ejection of the water droplet WD from the water discharge device 51 to the ground glass 52. Next, light is irradiated from both of the two

lights

55 and 56 toward the ground glass 52, and in this state, the vicinity of the collision point of the water droplet WD on the ground glass 52 is photographed by the high speed camera 54.

Next, the PC 57 processes the image taken by the high speed camera 54 to obtain the particle diameter of the water droplet WD. In this case, the PC 57 performs image analysis on the captured image including the water droplet WD and the scale 53, whereby the length on the captured image corresponding to 1 (mm) of the scale 53 and the particle diameter of the water droplet WD on the captured image. And the actual particle diameter of the water droplet WD is obtained from the ratio of these two values. Next, the PC 57 processes the image photographed by the high speed camera 54 to obtain the flow velocity of the water droplet WD (corresponding to the moving velocity of the water droplet WD). In this case, the PC 57 performs image analysis on the captured image including the water droplet WD and the scale 53, thereby obtaining an actual moving distance from the distance on the captured image where the water droplet WD has moved during a predetermined number of frames (described above). The flow velocity of the water droplet WD is obtained from the actual moving distance). Next, the measurer visually determines the water film WF and the water droplet WD included in the photographed image, and determines whether or not water splash has occurred due to the water droplet WD colliding with the water film WF. Here, “water splashing” means that the water film WF is lifted when the water droplet WD collides with the water film WF, and the raised water film WF is flipped (divided) and the water droplet jumps.

FIG. 5 is a diagram illustrating an example of a measurement result obtained by the measurement system 50 according to the embodiment of the present invention. Specifically, FIGS. 5A and 5B show an example of a captured image when the particle diameter of the water droplet WD is made constant and the flow velocity of the water droplet WD is varied. Specifically, FIG. 5A shows an example of a photographed image when the flow velocity of the water droplet WD is 3 (m / sec), and FIG. 5B shows the flow velocity of the water droplet WD of 5 (m / sec). An example of a photographed image is shown, and the particle diameter of the water droplet WD is fixed to 750 (μm) when these flow velocities are applied. In addition, the incident angle of the water droplet WD on the ground glass 52 (including the water film WF) is fixed to 90 degrees. In FIGS. 5A and 5B, the captured images are arranged in order from left to right in time series. For convenience of explanation, the image corresponding to the water droplet WD is circled, and water splash may occur. A bar is attached near the location on the image.

As shown in FIG. 5 (A), it can be seen that water splash does not occur when the flow velocity of the water droplet WD is 3 (m / sec) (see reference A21), as shown in FIG. 5 (B). When the flow velocity of the water droplet WD is 5 (m / sec), it can be seen that water splash has occurred (see reference A22). From this, it can be said that water splash is likely to occur when the flow velocity of the water droplet WD increases.

FIG. 6 is a diagram showing another example of the measurement result obtained by the measurement system 50 according to the embodiment of the present invention. Specifically, FIGS. 6A and 6B show an example of a photographed image when the flow velocity of the water droplet WD is made constant and the particle diameter of the water droplet WD is varied. Specifically, FIG. 6A shows an example of a photographed image when the particle diameter of the water droplet WD is 400 (μm), and FIG. 6B shows the particle diameter of the water droplet WD is 820 (μm). An example of a captured image is shown, and it is assumed that the flow velocity of the water droplet WD is fixed to 4 (m / sec) when these particle diameters are applied. In addition, the incident angle of the water droplet WD on the ground glass 52 (including the water film WF) is fixed to 90 degrees. In FIGS. 6A and 6B, the captured images are arranged in order from left to right in time series. For convenience of explanation, the image corresponding to the water droplet WD is circled, and water splash may occur. A bar is attached near the location on the image.

As shown in FIG. 6 (A), when the particle diameter of the water droplet WD is 400 (μm), it can be seen that no water splash occurs (see reference A31), and as shown in FIG. 6 (B), When the particle diameter of the water droplet WD is 820 (μm), it can be seen that water splashing occurs (see reference A32). From this, it can be said that when the particle diameter of the water droplet WD increases, water splash is likely to occur.

In this embodiment, each of the flow velocity and particle diameter of the water droplet WD ejected from the water discharge device 51 is set variously, and whether or not water splash occurs in the above-described method for various combinations of flow velocity and particle diameter. Was measured. The result is shown in FIG.

FIG. 7 is a diagram showing the presence or absence of water splash measured for various combinations of flow velocity and particle diameter applied to water droplets, and the average flow velocity and average particles of water droplets ejected from the water discharge device 2 according to the embodiment of the present invention. It is a figure for demonstrating the upper limit boundary line of a diameter.

In FIG. 7, the horizontal axis represents the flow velocity (m / sec) of the water droplet, and the vertical axis represents the particle size (μm) of the water droplet. Specifically, “◯” in FIG. 7 indicates the flow velocity and particle diameter when it is determined that no water splash has occurred by measurement, and “X” in FIG. 7 indicates water splash by measurement. The flow rate and particle size when it is determined that the occurrence of the From such a measurement result, using the curve L1 as shown in FIG. 7 as a boundary line, the regions defined by the flow velocity and the particle diameter are the region R1 where water splash occurs and the region R2 where water splash does not occur. Can be divided into The curve L1 can be expressed by the following approximate expression (3) using the flow velocity x (m / sec) and the particle diameter y (μm).
y = 9300 × x ^(−1.5) Formula (3)

In the present embodiment, the curve L1 represented by the above formula (3) is used as the upper limit boundary for the average flow velocity and the average particle diameter of water droplets ejected from the water discharge device 2. That is, the following formula (4) based on the formula (3) is used as a conditional formula to be satisfied by the average flow velocity X (m / sec) and the average particle diameter Y (μm) of water droplets ejected from the water discharge device 2. And If such conditional expression (4) is satisfied by the average flow velocity X (m / sec) and the average particle diameter Y (μm) of the water droplets ejected from the water discharging device 2, the water droplets ejected from the water discharging device 2 It will be possible to appropriately suppress water splashing due to.
Y ≦ 9300 × X ^(-1.5) Formula (4)

(2) Lower limit boundary line of flow velocity and particle diameter Next, the lower limit boundary line of the average flow velocity and average particle diameter of water droplets ejected from the water discharger 13 of the water discharge device 2 according to the present embodiment will be described. This lower limit boundary line is determined from the viewpoint of ensuring the cleaning performance (dirt removal performance / hand washing performance) by the water discharge device 2 of the present embodiment.

In the present embodiment, the following measurement procedure is performed in obtaining the above lower limit boundary line. First, a pseudo soil containing ethanol and Sudan Red at a mass ratio of “6: 1” is created. Next, the created 0.2 (cc) pseudo dirt is adhered to ground glass having a size of 80 (mm) × 80 (mm). Next, the ground glass to which pseudo-stain is adhered is left for 1 minute, and the pseudo-stain is spread on the whole ground glass by its own weight, and then the ground glass to which pseudo-stain is adhered is heated at 50 (° C.) for 2 minutes by a hot plate. And dry. Next, water discharge is performed for 5 seconds toward the center of the ground glass by the water discharge device. In this case, the water outlet of the water discharging device and the surface of the ground glass are separated by 80 (mm).

Next, the ground glass on which water has been discharged as described above is dried by heating at 50 (° C.) for 1 minute with a hot plate, and then placed in a Petri dish. Next, 20 (cc) of oleic acid is dropped into a Petri dish to separate the pseudo soil from the ground glass. Next, oleic acid and pseudo-fouling are collected, and these are put into a special container of the spectrophotometer and measured. Next, from the value obtained by the measurement using this spectrophotometer, the stain removal rate indicating the degree of removal of the pseudo dirt (assuming that the smaller the value, the higher the degree of removal of the pseudo dirt). Ask. Specifically, first, in order to perform zero correction of the spectrophotometer, a measurement value when only oleic acid is used is obtained in advance, and the above-described water discharge is not performed (that is, 0.2 ( The ground glass is measured in a state where 100% of cc) pseudo-stain remains, and the measured value when the stain removal rate is the maximum value (100%) is obtained. Then, based on the measurement values obtained in advance in this way, the stain removal rate (decrease rate) corresponding to the value obtained by the measurement using the spectrophotometer-dedicated container containing the oleic acid and pseudo soil collected this time )

Here, spray water discharged from the

water discharge device

2 and 2 liters of foam water discharged per minute are applied as water discharged to the ground glass to which pseudo dirt is adhered, and the measurement results are obtained according to the procedure described above under the same conditions for each. Obtained. More specifically, when spray water spouting was applied, the measurement was performed by changing the flow velocity and particle diameter of water droplets ejected by the water spouting device 2 in various ways. In this case, by applying various types of water discharger 13 to the water discharger 2 (which changes the flow rate of the water discharger 13), the flow velocity and particle diameter of the water droplets to be ejected were changed.

According to such a measurement, a soil removal rate of 22 (%) was obtained with 2 liters of foam spout. And from the measurement result when using spray water discharge, the flow rate and the particle diameter were obtained when the soil removal rate equivalent to the stain removal rate 22 (%) by 2 liters of foam water discharge was obtained. . The result is shown in FIG.

FIG. 8 is a diagram showing the results of the flow velocity and the particle diameter at which a stain removal rate of about 22 (%) was obtained by spray water discharge, and the average flow velocity of water droplets ejected from the water discharge device 2 according to the embodiment of the present invention It is a figure for demonstrating the minimum boundary line of an average particle diameter.

In FIG. 8, the horizontal axis represents the flow velocity (m / sec), and the vertical axis represents the particle diameter (μm). Specifically, “▲” in FIG. 8 indicates the flow velocity and particle diameter at which a stain removal rate of about 22% was obtained. From these results, the following approximate expression corresponding to the straight line L2 shown in FIG. 8 shows the relationship between the flow velocity x (m / sec) and the particle diameter y (μm) at which a stain removal rate of about 22 (%) is obtained. (5).
y = −360 × x + 1500 Formula (5)

In the present embodiment, the lower limit boundary line for the average flow velocity and the average particle diameter of the water droplets ejected from the water discharge device 2 is defined by the straight line L2 represented by the above formula (5). That is, the following formula (6) based on the formula (5) is used as a conditional formula to be satisfied by the average flow velocity X (m / sec) and the average particle diameter Y (μm) of water droplets ejected from the water discharge device 2. And If such conditional expression (6) is satisfied by the average flow velocity X (m / sec) of the water droplets ejected from the water discharger 2 and the average particle diameter Y (μm), It becomes possible to realize a stain removal rate comparable to the stain removal rate by 2 liters of foam spout water per minute. That is, it is possible to ensure appropriate cleaning performance by the spray water discharged from the water discharge device 2.
Y ≧ −360 × X + 1500 Formula (6)

(3) Lower limit value of flow velocity Next, the lower limit value of the average flow velocity of water droplets ejected from the water discharger 13 of the water discharge device 2 according to the present embodiment will be described. This lower limit is determined from the viewpoint of forming appropriate spray water discharge by the water discharge device 2 of the present embodiment.

As described above, in this embodiment, a water discharge form in which water is intermittently discharged in a range larger than the opening diameter of the water discharge port 13a of the water discharge unit 13 is applied as the spray water discharge. Whether or not such spray water discharge is appropriately formed depends on the flow velocity (uniquely corresponding to the flow rate) applied to the water discharge device 2. This will be specifically described with reference to FIG.

FIG. 9 is a diagram showing a specific example of the water discharge form by the water discharge device 2 when the flow rate applied to the water discharge device 2 according to the embodiment of the present invention is variously changed. FIG. 9 shows, sequentially from the left, a photographed image showing a water discharge form when a flow rate of 0.2 (L / min) is applied, and a photograph showing a water discharge form when a flow rate of 0.15 (L / min) is applied. An image, a photographed image showing a water discharge form when a flow rate of 0.1 (L / min) is applied, and a photographed image showing a water discharge form when a flow rate of 0.05 (L / min) is applied are shown. .

From FIG. 9, at a flow rate of 0.1 to 0.2 (L / min), appropriate spray water discharge is formed by the water discharge device 2, that is, water spreads over a range larger than the opening diameter of the water discharge port 13a. It turns out that it is discharging intermittently. On the other hand, at a flow rate of 0.05 (L / min), appropriate spray water discharge is not formed by the water discharge device 2, that is, the water is intermittently spread over a range larger than the opening diameter of the water discharge port 13a. It turns out that it is not discharged. This is because a swirling flow (see arrow A12 in FIG. 3) necessary for forming appropriate spray water discharge cannot be formed inside the water discharge section 13 at a small flow rate.

Therefore, in this embodiment, the flow velocity corresponding to the flow rate of 0.05 (L / min) is used as the lower limit value of the average flow velocity of the water droplets ejected from the water discharge unit 13 of the water discharge device 2. When the opening diameter of the water discharge port 13a of the water discharge section 13 is 0.8 (mm), it corresponds to an opening diameter of 0.8 (mm) using a theoretical formula of “flow rate = cross-sectional area × flow velocity”. A flow rate of about 1.7 (m / sec) is obtained from the cross-sectional area and the flow rate of 0.05 (L / min) described above. In the present embodiment, 1.7 (m / sec) is used as the lower limit value of the average flow velocity of water droplets ejected from the water discharge device 2. By applying 1.7 (m / sec) as described above and setting the average flow velocity of water droplets ejected from the water discharge device 2 to 1.7 (m / sec) or more, the water discharge device 2 forms appropriate spray water discharge. It becomes possible, that is, it spreads over a range larger than the opening diameter of the water discharge port 13a and can discharge water intermittently.

(4) Lower limit value of particle diameter Next, the lower limit value of the average particle diameter of water droplets ejected from the water discharger 13 of the water discharge device 2 according to the present embodiment will be described. This lower limit is determined from the viewpoint of appropriately lowering the water droplets ejected by the water discharging device 2 of the present embodiment without floating.

In the present embodiment, it is considered that the lower limit of the average particle diameter is defined using the following formula (7) obtained by modifying a general Stokes formula.

In equation (7), “d” indicates the particle size, “η” indicates the viscosity of water, “v” indicates the terminal velocity, “ρ _p ” indicates the density of water, and “ρ _f ” indicates The density of air is shown, and “g” shows the acceleration of gravity. The terminal velocity v is assumed to be a velocity when the force is balanced and stops changing when the object receives a body force such as gravity or centrifugal force and a drag force depending on the velocity. In this case, it is assumed that the object is moving alone, that is, even if another object is present, it is moving without being affected by it. In equation (7), it is assumed that the velocity of the particle traveling vector is zero, and actually the particle falls freely in the direction of gravity.

In the present embodiment, in the above equation (7), the particle diameter d when the terminal velocity v≈0 is used as the lower limit value of the average particle diameter. This is because the state where the terminal velocity v≈0 corresponds to the state where the water droplets ejected from the water discharging device 2 are floating without falling. Since the expression (7) does not hold when the terminal speed v is 0, 1 (mm / sec) is substituted into the expression (7) as the terminal speed v. Further, the values of the water viscosity η, the water density ρ _p , and the air density ρ _f when the water temperature and the air temperature are 5 ° C. are substituted into the equation (7), respectively. Then, a particle diameter d of about 35 (μm) is obtained.

In the present embodiment, 35 (μm) obtained in this way is used as the lower limit value of the average particle diameter of water droplets ejected from the water discharge device 2. If this 35 (μm) is applied and the average particle diameter of the water droplets ejected from the water discharging device 2 is 35 (μm) or more, the water droplets ejected from the water discharging device 2 can be appropriately lowered without floating. become able to. Thereby, for example, the water droplets ejected from the water discharge device 2 can appropriately reach the user's hand.

(5) Upper limit of particle diameter Next, the upper limit of the average particle diameter of the water droplet injected from the water discharging part 13 of the water discharging apparatus 2 by this embodiment is demonstrated.

According to the measurement performed by the inventors of the present invention, when the particle diameter of water droplets ejected from the water discharge device 2 exceeds 9000 (μm), the water droplets break up without being maintained even in a windless state. Turned out to be. As described above, when the water droplets ejected from the water discharging device 2 are split in the middle, it becomes difficult to control and water splash cannot be appropriately suppressed.

Therefore, in this embodiment, the upper limit value of the average particle diameter of the water droplets ejected from the water spouting device 2 is specified from the viewpoint of preventing the water droplets ejected by the water spouting device 2 from maintaining the particle diameter appropriately and not splitting. . Specifically, in the present embodiment, from the above measurement results, using 9000 (μm) as the upper limit value of the average particle diameter of water droplets ejected from the water discharge device 2, the average particle diameter of water droplets ejected from the water discharge device 2 is used. Is 9000 (μm) or less.

(6) Preferred Flow Rate and Range of Particle Size Next, referring to FIG. 10, from the water discharge unit 13 of the water discharge device 2 according to the present embodiment according to the contents described in (1) to (5) above. A suitable range of the average flow velocity and average particle diameter of the water droplets to be ejected will be described.

FIG. 10 is a diagram for explaining a preferable range of the average flow velocity and the average particle diameter of water droplets ejected from the water discharge device 2 according to the embodiment of the present invention. In FIG. 10, the horizontal axis represents the flow velocity (m / sec), and the vertical axis represents the particle diameter (μm). Specifically, in FIG. 10, in addition to the curves L1 and L2 described in (1) and (2) above (see FIGS. 7 and 8), the average flow velocity described in (3) above is shown. A straight line L3 corresponding to the lower limit of 1.7 (m / sec), a straight line L4 corresponding to the lower limit of 35 (μm) of the average particle diameter described in (4) above, and the above (5 And a straight line L5 corresponding to 9000 (μm) which is the upper limit value of the average particle diameter described in the above.

As shown in FIG. 10, in the present embodiment, the flow velocity and the particle diameter in the range R3 defined by the curve L1 and the straight lines L2 to L5 so as to satisfy all the conditions described in the above (1) to (5). Is applied as the average flow velocity and average particle diameter of water droplets ejected from the water discharge device 2.

<Operational effects of this embodiment>
Next, the effect of the water discharging apparatus by embodiment of this invention is demonstrated.

According to the present embodiment, in the water discharge device 2 that performs spray water discharge capable of realizing water saving and water discharge over a wide range, the average flow velocity and average particle diameter of water droplets ejected from the water discharge device 2 are the above conditional expressions ( By satisfy | filling 4), the water splash by the water droplet injected from the water discharging apparatus 2 can be suppressed appropriately.

Moreover, according to this embodiment, the average flow velocity and average particle diameter of the water droplets ejected from the water discharger 2 satisfy the above-described conditional expression (6), so that the water discharger 2 can be appropriately supplied with the spray water discharged. Cleaning performance (hand washing performance, etc.) can be ensured.

Further, according to the present embodiment, by setting the average flow velocity of the water droplets ejected from the water discharge device 2 to 1.7 (m / sec) or more, appropriate water spray can be formed by the water discharge device 2. In other words, it is possible to appropriately realize a water discharge mode in which water is intermittently discharged over a range larger than the opening diameter of the water discharge port 13a.

Moreover, according to this embodiment, the average particle diameter of the water droplets ejected from the water discharging device 2 is set to 35 (μm) or more, so that the water droplets ejected from the water discharging device 2 are appropriately lowered without floating. Can do. Thereby, for example, the water droplets ejected from the water discharge device 2 can appropriately reach the user's hand.

Moreover, according to this embodiment, it is appropriate that the water droplets ejected from the water spouting device 2 break up in the middle by setting the average particle diameter of the water droplets ejected from the water spouting device 2 to 9000 (μm) or less. Can be suppressed. Thereby, it becomes easy to control to suppress water splash.

In addition, according to the present embodiment, by setting the discharge angle θ (see FIG. 3) from the water discharge port 13a of the water discharge device 2 to 40 to 50 degrees, the entire user's hand is sprayed by the spray water discharged from the water discharge device 2. It can be covered and the hand washing performance can be improved.

<Modification>
In the embodiment described above, the average flow velocity and average particle diameter of the water droplets ejected from the water discharger 2 satisfy all the conditions (1) to (5) described in the section <Flow velocity and particle diameter of spray water discharge>. However, this is not a limitation. In another example, the average flow velocity and the average particle diameter of water droplets ejected from the water discharge device 2 are any one or more of the conditions (1) to (5) (various combinations of the conditions (1) to (5)) May also be satisfied).

Further, in the above-described embodiment, general tap water (city water) is discharged from the water discharge device 2, but instead, functional water having a sterilizing function, such as electrolyzed water (that is, sterilizing). Water) may be discharged. In one example, an electrolytic bath may be provided on the upstream side of the flow path 15 of the water discharging device 2, and the electrolytic water generated by the electrolytic bath may be discharged from the water discharging portion 13.

Moreover, although the example which applied this invention to the hand-washing machine was shown in above-described embodiment (refer FIG. 1), application of this invention is not limited to this. In another example, the present invention can be applied to a kitchen.
FIG. 11: is the perspective view which looked at the kitchen which applied the water discharging apparatus by the modification in embodiment of this invention from diagonally upward. The kitchen 5 shown in FIG. 11 mainly includes a water discharge device 6 that performs water discharge (spray water discharge / mist water discharge) in a mist shape so that water spreads from the water discharge port as indicated by reference numeral M, and the water discharge device 6. A sink 7 serving as a water receiving portion that receives the discharged water and drains it from a drain port (not shown). If the same structure as the water discharging apparatus 2 by embodiment mentioned above is applied with respect to the water discharging apparatus 6 of such a kitchen 5, the effect similar to the content described in the section of <the effect by this embodiment> is obtained. can get.

DESCRIPTION OF SYMBOLS 1

Washing machine

2, 6 Water discharging apparatus 3 Bowl 5 Kitchen 6 Sink 11 Water discharging pipe 13 Water discharging part 13a Water discharging port 15 Flow path

Claims

A water discharging device that is installed with a predetermined open space between the water receiving portion and discharges water toward the water receiving portion,
A water discharger that sprays water droplets so as to spread at a predetermined angle from the water discharge port, and has the water discharger set to discharge a predetermined flow rate,
The water droplets ejected from the water discharge part have a mean flow velocity X (m / sec) and a mean particle diameter Y (μm) satisfying the following conditional expression (1).
Y ≦ 9300 × X (-1.5) Formula (1)
The water discharge device according to claim 1, wherein the average flow velocity X and the average particle diameter Y of the water droplets ejected from the water discharge portion further satisfy the following conditional expression (2).
Y ≧ −360 × X + 1500 Formula (2)
The water discharge device according to claim 1 or 2, wherein an average flow velocity X of water droplets ejected from the water discharge unit is 1.7 (m / sec) or more.
The water discharge device according to any one of claims 1 to 3, wherein an average particle diameter Y of water droplets ejected from the water discharge portion is 35 (µm) or more.
The water discharge device according to any one of claims 1 to 4, wherein an average particle diameter Y of water droplets ejected from the water discharge portion is 9000 (µm) or less.
The water discharging device according to any one of claims 1 to 5, wherein the water discharging unit sprays water droplets so as to spread at an angle of 40 to 50 degrees as the predetermined angle.