JP6236751B1 - Water discharge device - Google Patents

Abstract

Disclosed is a water discharge device that can be configured compactly with a simple structure and can obtain water discharge that is easy to use. The present invention provides a water discharge device (1) for discharging hot water while reciprocatingly vibrating hot water and a water discharge device main body (2) and a vibration generating element (4) provided in the water discharge device main body. The vibration generating element is disposed at the water supply passage (10a) and the downstream end of the water supply passage, and the hot water guided by the water supply passage collides with the vortex alternately opposite to the downstream side. A hot water collision part (14) to be generated, a vortex passage (10b) that is provided downstream of the water supply passage and guides the vortex to grow, and is provided on the downstream side of the vortex passage, and the flow passage cross-sectional area is downstream A pair of wall surfaces facing each other of the vortex street passage, at least in the downstream portion, the flow passage cross-sectional area toward the downstream side. It is characterized by being tapered so as to reduce. [Selection] Figure 4A

Description

  The present invention relates to a water discharge device, and more particularly to a water discharge device that discharges hot water (hot water or water) from a water discharge port while reciprocally vibrating.

  There is known a shower head in which the direction of hot water discharged from a water discharge port changes in a vibrational manner. In a water discharge device such as this shower head, the nozzle is driven oscillating by the supply pressure of hot water supplied to change the direction of hot water discharged from the discharge port. In such a type of water discharge device, since hot water can be discharged from a single water discharge port to a wide range, it is expected that a water discharge device capable of discharging water over a wide range can be configured compactly.

  On the other hand, Japanese Patent Application Laid-Open No. 2000-120141 (Patent Document 1) describes a warm water cleaning toilet seat device. In this warm water cleaning toilet seat device, self-excited oscillation is induced by using a fluid element nozzle, and the ejection direction of the cleaning water is changed in an oscillating manner. Specifically, in this warm water washing toilet seat apparatus, as shown in FIG. 11, feedback flow paths 104 are provided on both sides of the injection nozzle 102. Each feedback flow path 104 is a loop-shaped flow path communicating with the injection nozzle 102, and is configured such that a part of the cleaning water flowing through the injection nozzle 102 flows in and circulates. Moreover, the injection nozzle 102 is comprised in the shape which spreads in the taper shape toward the injection port 102a of an elliptical cross section.

  When the cleaning water is supplied, the cleaning water sprayed from the spray nozzle 102 is attracted to the wall surface on either side of the spray port 102a having an elliptical cross section by the Coanda effect, so as to follow this. (State a in FIG. 11). When the cleaning water is jetted along one wall surface, the cleaning water also flows into the feedback channel 104 on the side where the cleaning water is jetted, and the pressure in the feedback channel 104 increases. Due to this pressure increase, the sprayed cleaning water is pushed, and the cleaning water is attracted to the opposite wall surface and sprayed along the opposite wall surface (state a → b → c in FIG. 11). . Further, when the cleaning water is made along the opposite wall surface, the pressure in the feedback channel 104 on the opposite side increases and the jet cleaning water is pushed back (state c → b → a in FIG. 11). . By repeating this action, the direction of the sprayed wash water changes in vibration between states a and c in FIG.

  Japanese Unexamined Patent Application Publication No. 2004-275985 (Patent Document 2) describes a pure fluid element. In this pure fluid element, a connecting duct is provided so as to cross the fluid ejection nozzle, and the pressure on the upper side or the lower side in the fluid ejection nozzle alternately rises due to the action of this coupling duct. The jet pushed by this pressure increase becomes a jet along the upper plate of the fluid jet nozzle or a jet along the lower plate due to the Coanda effect, and these states are repeated at a constant cycle, and the jet direction is oscillated. It becomes a changing flow.

  Further, Japanese Patent Publication No. 58-49300 (Patent Document 3) describes a vibration spray device. This vibration spray device has the configuration shown in FIG. 12 and uses the Karman vortex generated in the front chamber 110 to change the direction of the jet flow ejected from the outlet 112 in a vibrational manner. First, the fluid flowing into the front chamber 110 from the inlet hole 114 collides with an obstacle 116 having a triangular cross section provided in an island shape in the front chamber 110. When the fluid collides, Karman vortices are alternately generated on the upper and lower sides of the obstacle 116 on the downstream side of the obstacle 116 to form a vortex street.

  The Karman vortex street reaches the outlet 112 while growing. In the vicinity of the outlet 112, the flow velocity on the side where the vortex of the vortex row exists is fast, and the flow velocity on the opposite side is slow. In the example shown in FIG. 12, Karman vortices are alternately generated on the upper side and the lower side of the obstacle 116, and the vortex streets sequentially reach the outlet 112. The state where the lower flow velocity is fast appears alternately. In a state where the upper flow velocity is high, the fluid having a high flow velocity collides with the wall surface 110a on the upper side of the outlet 112 and changes its direction, and the fluid ejected from the outlet 112 becomes a jet flow directed obliquely downward as a whole. On the other hand, in a state where the lower flow velocity is high, the fluid having a high flow velocity collides with the wall surface 110b below the outlet 112, and a jet directed obliquely upward is ejected from the outlet 112. By repeating such a state alternately, the jet flow from the outlet 112 is jetted while reciprocating.

  As described above, it is conceivable that the fluid elements described in Patent Documents 1 to 3 are applied to a water discharge device such as a shower head to discharge hot water while reciprocally vibrating.

JP 2000-120141 A JP 2004-275985 A Japanese Patent Publication No.58-49300

  First, a water discharge device that changes the direction of hot water discharged by oscillating the water spray nozzle needs to drive the nozzle, so the structure around the nozzle becomes complicated, and a plurality of nozzles are compactly discharged. There is a problem that it is difficult to store. Further, in this type of water discharge device, since the nozzle physically moves, the movable part is likely to be worn, and in order to avoid wear, there is a problem that the selection of the material of the member constituting the movable part is restricted. There is. Furthermore, since it is necessary to form the movable part of a complicated structure with the material which is hard to wear, there exists a problem that cost becomes high.

On the other hand, the ejection devices of the types described in Patent Documents 1 to 3 utilize an oscillation phenomenon caused by a fluid element, and can change the fluid ejection direction without providing a movable member. Thus, there is an advantage that the nozzle portion can be configured in a compact manner.
However, when the fluid elements described in Patent Documents 1 and 2 are applied to a water discharge device such as a shower head, the present inventors have found a problem that the comfort of spraying hot water is not good. Here, the good bathing comfort targeted by the inventor means a state where large droplets of hot and cold water are uniformly discharged over a wide area. That is, when the droplets of hot water discharged from the shower head are excessively small, the hot water becomes mist-like, and even if the same amount of hot water is taken, it is impossible to obtain the feeling of taking a shower. Moreover, if the hot water discharged is uneven within the water discharge range, the user's intentional showering portion cannot be washed out uniformly, resulting in poor usability.

  Here, since the fluid element described in Patent Documents 1 and 2 uses a phenomenon in which the ejected fluid flows along the wall surface due to the Coanda effect, the fluid ejected into the discharge range is uneven. Can be done. That is, in the warm water toilet seat device shown in FIG. 11, the wash water to be jetted transitions between the states a, b, and c, but in reality, the state a and the state where the jet is attracted to the wall surface. The period of c is long, and the period between them (near state b) is negligible. For this reason, when the fluid element described in Patent Documents 1 and 2 is applied to a water discharge device such as a shower head, the water discharge amount in the peripheral portion of the water discharge range is large, and the water discharge amount in the vicinity of the center is small. It will be in a state and will become uncomfortable.

  On the other hand, since the fluid element described in Patent Document 3 applies Karman vortex, the phenomenon that the jet flows while being attracted to the wall surface hardly occurs. For this reason, a substantially uniform water discharge amount can be obtained within a water discharge range formed by vibrationally changing the water discharge direction. However, when the fluidic element shown in FIG. 12 is applied to a water discharge device such as a shower head, the problem that the range in which the injected hot water reciprocates vibrates strongly depends on the flow rate of the hot water to be ejected is the present invention. Found by a person. That is, in the fluid element shown in FIG. 12, when the flow rate is increased and the flow rate of the hot water sprayed from the outlet 112 is increased, the hot water collides with the wall surface 110a (or 110b) at a large speed and is largely redirected. For this reason, when the flow rate is large, the hot water sprayed from the outlet 112 spreads over a wide range, whereas when the flow rate becomes small, the water discharge range becomes narrow. Thus, if the water discharge range changes greatly with the change in the flow rate, the water discharge device becomes inconvenient.

  Accordingly, an object of the present invention is to provide a water discharge device that can be configured compactly with a simple structure and can obtain water discharge that is easy to use.

In order to solve the above-described problem, the present invention provides a water discharge device that discharges hot water from a water discharge port while reciprocatingly vibrating the water supply device main body and the water supply device provided in the water discharge device main body and reciprocatingly vibrates the supplied hot water. A vibration generating element that discharges while supplying water to the water supply passage through which hot water supplied from the water discharge device main body flows and a part of the cross section of the water supply passage. Located at the downstream end of the passage, the hot water guided by the water supply passage collides with the hot water collision portion that alternately generates the opposite vortex on the downstream side, and provided on the downstream side of the water supply passage, A vortex street passage that guides the vortex formed by the hot water collision portion while growing, and a pair of opposing wall surfaces provided on the downstream side of the vortex street passage so that the cross-sectional area of the flow path increases toward the downstream side. Tapered rectification Has a road, and the small without even part of the downstream side of the vortex passage, the flow path cross-sectional area is opposed to reduced toward the downstream side, a pair of tapered walls are constituted, vortex A separation portion that separates the flow along the inner wall surface of the vortex passage from the wall surface is formed between the tapered wall surface of the row passage and the rectification passage, and the separation portion is more than the downstream end of the tapered wall surface of the vortex passage. The cross-sectional area of the flow path is configured to decrease toward the downstream side , and the angle formed by the wall surface constituting the separation portion and the central axis is larger than the angle formed by the tapered wall surface of the vortex street passage and the central axis. It is characterized by being.

  According to the present invention configured as described above, since the hot water discharged from the water discharging device can be reciprocally vibrated by the vibration generating element, the hot water is distributed over a wide range from one water outlet with a compact and simple structure. It can be discharged. In addition, since the direction of water discharge can be changed without moving the nozzle to be discharged, there is no problem such as wear of movable parts, and a highly durable water discharge device can be configured at low cost. In addition, since the vortex street of the vibration generating element is tapered so that the cross-sectional area of the flow path is reduced, the water discharge range does not change greatly depending on the water discharge flow rate, and it is easy to use. A water discharging device can be configured. That is, since the hot water flowing in the vortex passage flows along the tapered wall surface, the direction in which the hot water is ejected is generally defined as the direction along the tapered wall surface, which is caused by the change in flow rate. Thus, the water discharge range becomes difficult to change, and the water discharge range can be made almost constant.

  However, although it has become possible to improve the dependency of the water discharge range on the water discharge flow rate by making the flow of hot water flow along the tapered wall surface, a new technical problem has arisen with this configuration. That is, the water discharge obtained in this way was “slow out” with a large amount of water in the peripheral portion of the water discharge range and a small amount of water discharged near the center, resulting in unpleasant water discharge. It is considered that this is because the Coanda effect occurs due to the hot water flowing along the tapered wall surface, and the water discharge is concentrated around the water discharge range. Therefore, in order to solve this new technical problem, the present inventor has a pair of opposed rectifying passages provided on the downstream side of the vortex passage so as to separate the flow of hot water along the wall surface of the vortex passage. The wall surface was tapered, and the cross-sectional area of the flow path was increased toward the downstream side. Thereby, when the flow along the wall surface of the vortex passage formed so as to reduce the cross-sectional area of the flow path flows into the rectification path formed so that the cross-sectional area of the flow path expands, it is separated from the wall surface. The Coanda effect at the exit portion of the vibration generating element can be suppressed. As described above, the present inventor suppresses the Coanda effect when hot water is injected from the rectifying passage by configuring the rectifying passage such that the flow passage cross-sectional area expands toward the downstream side, and the water discharge range. We succeeded in suppressing the change in the water discharge range due to the change in flow rate while distributing the droplets uniformly.

Furthermore, according to this invention, since the peeling part is provided between the vortex street passage and the rectification passage, the flow of hot water flowing into the rectification passage can be more strongly separated from the wall surface. Thereby, the Coanda effect when hot water is injected from the rectifying passage can be further suppressed, and the droplets can be distributed uniformly in the water discharge range.

In the present invention, preferably, a pair of wall surfaces pair direction is provided with a taper, and a passage connecting the vortex passage rectifying passage.

  According to the present invention configured as described above, the peeling portion is configured by a passage in which a pair of opposing wall surfaces are tapered, so that the oscillation angle due to the flow rate change is promoted while promoting the peeling from the wall surface. Can be stabilized.

  In the present invention, it is preferable that the ratio of the width W of the hot water collision portion to the distance Y from the hot water collision portion to the upstream end of the rectifying passage is Y / W = 1.6 to 16 in the vortex street passage. Is formed.

  According to the present invention configured as above, the ratio Y / W of the width W of the hot water collision portion and the distance Y from the hot water collision portion to the upstream end of the rectifying passage is set to 1.6 or more. The vortex street formed by the collision portion can be sufficiently grown, and the hot and cold water discharged from the water discharge port can be stably reciprocated. Moreover, by forming the ratio Y / W to 16 or less, hot water is discharged in a state where Karman vortices generated in the hot water collision portion are not excessively attenuated by flow path resistance, etc. The vibration generating element can be reduced in size while reciprocating.

In the present invention, preferably, the water supply passage, the hot water collision portion, the vortex street passage, and the rectifying passage are constituted by an integrally formed elastic member.
According to the present invention configured as described above, the water supply passage, the hot water collision portion, the vortex street passage, and the rectifying passage are integrally formed, so that a decrease in dimensional accuracy and shape accuracy due to the combination of a plurality of members is avoided. And the performance of the vibration generating element can be stabilized.

In the present invention, preferably, the water supply passage is configured so that the cross section of the flow passage is constant.
According to the present invention configured as described above, since the flow passage section of the water supply passage is configured to be constant, the hot water flowing into the vibration generating element collides with the hot water collision portion in a rectified state. Thereby, the variation of the vortex formed by the hot water collision part can be reduced, and the hot water discharged from the water discharge port can be reciprocally oscillated more uniformly. In addition, since the flow passage cross section of the water supply passage is configured to be constant, the mold for molding is also provided on the upstream side of the vibration generating element when the water supply passage, the hot water collision portion, the vortex street passage, and the rectifying passage are integrally formed. Can be removed relatively easily, and can be easily integrally formed.

  ADVANTAGE OF THE INVENTION According to this invention, it is possible to provide a water discharge device that can be configured compactly with a simple structure and can obtain water discharge that is easy to use.

It is a perspective view which shows the external appearance of the shower head by 1st Embodiment of this invention. It is a whole sectional view of the shower head by a 1st embodiment of the present invention. It is a perspective view which shows the external appearance of the vibration generating element with which the shower head by 1st Embodiment of this invention is equipped. It is a plane sectional view of a vibration generating element in a 1st embodiment of the present invention. It is a vertical sectional view of the vibration generating element in the first embodiment of the present invention. It is a figure which shows the result of the fluid simulation which analyzed the flow of the hot water in the vibration generating element with which the shower head by embodiment of this invention is equipped. As a comparative example, it is a figure which shows the result of the fluid simulation which analyzed the flow of the hot water in the vibration generating element of the structure shown in FIG. An example of a strobe photograph showing the flow of hot water discharged from a single vibration generating element provided in the shower head according to the first embodiment of the present invention is shown in the column (a), and as a comparative example, shown in FIG. It is the figure which showed an example of the flash photograph which shows the flow of the hot water discharged from the vibration generating element of a structure in the (b) column. In the vibration generating element, a strobe indicating the state of the discharged hot water when the ratio Y / W of the width W of the hot water collision portion and the distance Y from the hot water collision portion to the upstream end of the rectifying passage is changed to various values. It is an example of a photograph. It is a plane sectional view of a vibration generating element in a 2nd embodiment of the present invention. It is a plane sectional view of a vibration generating element in a 3rd embodiment of the present invention. It is a figure which shows the effect | action of the fluid element described in patent document 1. FIG. It is a figure which shows the structure of the fluid element described in patent document 3. FIG.

Next, a shower head which is a water discharge device according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings.
First, a shower head according to a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view showing an appearance of a shower head according to a first embodiment of the present invention. FIG. 2 is a full sectional view of the shower head according to the first embodiment of the present invention. FIG. 3 is a perspective view showing the appearance of the vibration generating element provided in the shower head according to the first embodiment of the present invention. 4A is a plan sectional view of the vibration generating element in the present embodiment, and FIG. 4B is a vertical sectional view of the vibration generating element.

As shown in FIG. 1, a shower head 1 according to this embodiment includes a shower head main body 2 that is a substantially cylindrical water discharge device main body, and seven embedded in the shower head main body 2 so as to be aligned in a straight line in the axial direction. A vibration generating element 4.
In the shower head 1 of the present embodiment, when hot water is supplied from a shower hose (not shown) connected to the base end portion of the shower head body 2, the hot water reciprocates from the water outlet 4 a of each vibration generating element 4. While being discharged. In the present embodiment, hot water is discharged from each water outlet 4a so as to form a sector having a predetermined central angle in a plane generally orthogonal to the central axis of the shower head body 2.

Next, the internal structure of the shower head 1 will be described with reference to FIG.
As shown in FIG. 2, in the shower head main body 2, a water passage forming member 6 that forms a water passage and a vibration generating element holding member 8 that holds each vibration generating element 4 are incorporated.
The water flow path forming member 6 is a substantially cylindrical member, and is configured to form a flow path of hot water supplied to the inside of the shower head main body 2. A shower hose connecting member 6 a is connected to the base end portion of the water passage forming member 6 in a watertight manner. Moreover, the front-end | tip part of the water flow path formation member 6 is notched by semicircular cross-sectional shape, and the vibration generation element holding member 8 is arrange | positioned at this notch part.

  The vibration generating element holding member 8 is a substantially semi-cylindrical member, and is arranged in a notch portion of the water passage forming member 6 so that a cylindrical shape is formed. Further, a packing 6b is disposed between the water flow path forming member 6 and the vibration generating element holding member 8, and water tightness between them is ensured. Furthermore, seven element insertion holes 8a for inserting and holding each vibration generating element 4 are formed in the vibration generating element holding member 8 so as to be aligned in a straight line in the axial direction at substantially equal intervals. Thereby, the hot water flowing into the water passage forming member 6 flows into the back side of each vibration generating element 4 held by the vibration generating element holding member 8, and is discharged from the water discharge port 4a provided on the front surface. . Further, each element insertion hole 8a is provided so as to be slightly inclined with respect to a plane orthogonal to the central axis of the shower head main body 2, and the hot water sprayed from each vibration generating element 4 is entirely taken as a shower head. It is discharged so as to spread slightly in the axial direction of the main body 2.

Next, with reference to FIG. 3, FIG. 4A and FIG. 4B, the structure of the vibration generating element 4 built in the shower head of this embodiment is demonstrated.
As shown in FIG. 3, the vibration generating element 4 is a substantially thin rectangular parallelepiped member. A rectangular water discharge port 4 a is provided on the end surface on the front side, and a flange portion 4 b is formed on the end portion on the back side. ing. Further, a groove 4 c is provided in parallel with the flange 4 b so as to make a round around the vibration generating element 4. An O-ring (not shown) is fitted in the groove 4c, and watertightness between the vibration generating element holding member 8 and the element insertion hole 8a is ensured. Further, the vibration generating element 4 is positioned with respect to the vibration generating element holding member 8 by the flange portion 4b, and is prevented from dropping from the vibration generating element holding member 8 due to water pressure. In the present embodiment, the vibration generating element 4 is an elastic member such as an integrally molded synthetic rubber.

4A is a cross-sectional view taken along line AA in FIG. 3, and FIG. 4B is a cross-sectional view taken along line BB in FIG.
As shown in FIG. 4A, a passage having a rectangular cross section is formed inside the vibration generating element 4 so as to penetrate in the longitudinal direction. This passage is formed in order from the upstream side as a water supply passage 10a, a vortex street passage 10b, and a rectification passage 10c.
The water supply passage 10a is a straight passage having a rectangular cross section with a constant cross-sectional area extending from the inlet 4d on the back side of the vibration generating element 4.
The vortex street passage 10b is a passage having a rectangular cross section provided on the downstream side of the water supply passage 10a so as to be continuous with the water supply passage 10a (without a step). That is, the downstream end of the water supply passage 10a and the upstream end of the vortex passage 10b have the same size and shape. A pair of opposing wall surfaces (both side surfaces) of the vortex street passage 10b are formed in parallel on the upstream side and tapered on the downstream side so that the flow path cross-sectional area decreases toward the downstream end. A tapered portion 10d is provided. That is, the vortex street passage 10b is configured to extend from the upstream end with a constant cross-sectional area and then gradually narrow toward the downstream side.

  The rectifying passage 10c is a passage having a rectangular cross section provided on the downstream side so as to communicate with the vortex street passage 10b, and is configured to taper such that the cross-sectional area of the flow passage increases toward the downstream side. Hot water containing the vortex street guided by the vortex street passage 10b is rectified by the rectification passage 10c and discharged from the water outlet 4a. Since the rectifying passage 10c is provided so as to be continuous with the downstream end of the vortex passage 10b (without a step), the flow passage cross-sectional area at the upstream end of the rectifying passage 10c and the flow passage at the downstream end of the vortex passage 10b. The cross-sectional area is the same. The rectifying passage 10c has a minimum flow path cross-sectional area at the upstream end, and the flow path cross-sectional area increases toward the downstream end.

  On the other hand, as shown in FIG. 4B, the wall surfaces (ceiling surface and floor surface) facing the height direction of the water supply passage 10a, the vortex passage 10b, and the flow straightening passage 10c are all provided on the same plane. That is, the heights of the water supply passage 10a, the vortex street passage 10b, and the rectification passage 10c are all the same and constant.

  Next, a hot water collision portion 14 is formed at the downstream end of the water supply passage 10a (near the connection portion between the water supply passage 10a and the vortex passage 10b), and the hot water collision portion 14 is a cross-sectional view of the flow path of the water supply passage 10a. It is provided so as to block a part of. The hot water collision portion 14 is a triangular prism-shaped portion extending so as to connect the wall surfaces (ceiling surface and floor surface) facing the height direction of the water supply passage 10a, and has an island shape at the center in the width direction of the water supply passage 10a. Is arranged. The cross section of the hot water collision part 14 is formed in a right-angled isosceles triangle shape, the hypotenuse is arranged so as to be orthogonal to the central axis of the water supply passage 10a, and the right-angled part of the right-angled isosceles triangle is on the downstream side. It is arranged to face. By providing this hot / cold water collision part 14, a Karman vortex is generated on the downstream side thereof, and hot water discharged from the water discharge port 4a is reciprocated. Moreover, in this embodiment, the hot water collision part 14 is located on the upstream side of the upstream end of the vortex passage 10b, and the oblique side part of the right angled isosceles triangle (upstream end of the hot water collision part 14) is an isosceles right angle. The triangular right-angled part (the downstream end of the hot / cold water impinging portion 14) is disposed downstream of the upstream end of the vortex street passage 10b.

  In the present embodiment, in the tapered portion of the vortex street passage 10b, the angle formed by the side wall surface and the central axis (angle α in FIG. 4A) is about 7 °. Preferably, the angle formed between the side wall surface and the central axis is set to about 3 ° to about 25 °. Furthermore, the angle (angle γ in FIG. 4A) formed by the wall surface of the rectifying passage 10c and the central axis is about 20 °. The angle γ formed by the wall surface of the rectifying passage 10c and the central axis is preferably set to be larger than the angle of reciprocating vibration of hot water discharged from the water discharge port 4a (angle A in FIG. 4A). The angle γ is preferably set to about 3 ° or more. By setting the angle in this way, it is possible to suppress the occurrence of the Coanda effect while suppressing the change in the water discharge range accompanying the change in the discharge flow rate. In addition, the flow path cross-sectional area of a portion of the downstream end of the supply passage 10a partially blocked by the hot water collision portion 14 is configured to be larger than the flow path cross-sectional area of the rectifying passage 10c.

  Further, in the present embodiment, the vibration generating element 4 has a ratio of the maximum width W of the hot water collision portion 14 to the distance Y from the upstream end of the hot water collision portion 14 to the upstream end of the rectifying passage 10c. It is configured to be about 5. Preferably, the vibration generating element 4 is configured so that the ratio of the width W of the hot water collision portion 14 and the distance Y from the hot water collision portion 14 to the upstream end of the rectifying passage 10c is Y / W = 1.6-16. To do. By forming the vibration generating element 4 with such a dimensional ratio, the hot water discharged from the vibration generating element 4 can be stably oscillated.

Next, the action of the shower head 1 according to the embodiment of the present invention will be described with reference to FIGS.
FIG. 5 is a diagram showing a fluid simulation result obtained by analyzing the flow of hot water in the vibration generating element 4 provided in the shower head 1 according to the embodiment of the present invention. FIG. 6 is a diagram showing a fluid simulation result obtained by analyzing the flow of hot water in the vibration generating element having the structure shown in FIG. 12 as a comparative example. The (a) column of FIG. 7 is an example of a stroboscopic photograph showing the flow of hot water discharged from the single vibration generating element 4 provided in the shower head 1 according to the embodiment of the present invention. The column (b) of FIG. 7 is an example of a stroboscopic photograph showing the flow of hot water discharged from the vibration generating element having the structure shown in FIG. 12 as a comparative example. (A) column to (f) column in FIG. 8 is a case where the ratio Y / W of the width W of the hot water collision portion and the distance Y from the hot water collision portion to the upstream end of the rectifying passage is changed to various values. It is an example of the flash photograph which shows the state of the discharged hot water.

  First, hot water supplied from a shower hose (not shown) flows into the water passage forming member 6 (FIG. 2) in the shower head body 2 and further generates each vibration held by the vibration generating element holding member 8. It flows into the inlet 4d of the element 4. The hot water flowing into the water supply passage 10a from the inlet 4d of each vibration generating element 4 collides with the hot water collision portion 14 provided so as to block a part of the flow path. As a result, a vortex row of Karman vortices that are alternately opposite to each other is formed on the downstream side of the hot water / impact portion 14. The Karman vortex formed by the hot water / water impinging portion 14 grows while being guided by the vortex street 10b tapered from the middle and reaches the rectifying passage 10c.

  The results of analyzing the flow of hot water in the vortex street passage 10b by fluid simulation are shown in the columns (a) to (c) of FIG. As shown in the fluid simulation, a vortex is generated on the downstream side of the hot water / impact portion 14 and the flow velocity is high at that portion. The high flow velocity portions (the dark portions in FIG. 5) appear alternately on both sides of the hot water collision portion 14, and the vortex train advances toward the water discharge port 4a along the wall surface of the vortex train passage 10b. The hot water flowing into the rectification passage 10c on the downstream side of the vortex street passage 10b is rectified here. Hot water discharged from the spout 4a through the rectifying passage 10c is bent based on the flow velocity distribution at the spout 4a, and the discharge direction changes as the portion with the higher flow velocity moves in the vertical direction in FIG. That is, in a state where the high flow rate portion is located at the upper end of the spout 4a in FIG. 5, the hot water is jetted downward, and in a state where the high flow rate portion is located at the lower end of the spout 4a, Injected upward. In this way, by generating Karman vortices alternately on the downstream side of the hot water collision portion 14, a flow velocity distribution is generated at the spout 4a, and the jet is deflected. In addition, since the position of the portion having a high flow velocity reciprocates as the vortex train advances, the injected hot and cold water also vibrates reciprocally.

  Further, the vortex street passage 10b is tapered at the downstream end so that the cross-sectional area of the flow path is minimized, and the rectifying passage 10c connected to the vortex passage 10b expands toward the downstream side. For this reason, the flow along the tapered wall surface (tapered portion wall surface) of the vortex street passage 10b is separated when it flows into the rectifying passage 10c. When the flow is separated from the wall surface by the inflow to the rectifying passage 10c, the Coanda effect generated on the wall surface of the rectifying passage 10c is suppressed. By suppressing the Coanda effect, the hot water discharged from the water discharge port 4a is smoothly reciprocated without being biased toward the end of the water discharge range.

  On the other hand, as a comparative example, as shown in columns (a) to (c) of FIG. 6, in the vibration generating element having the structure shown in FIG. 12, a Karman vortex vortex is generated downstream of the collision portion. However, the hot water sprayed at the spout is largely deflected, and the water discharge range of the sprayed hot water is too wide. In addition, it was confirmed that when the simulation was performed with the flow rate of hot water to be discharged reduced, the injected hot water was not deflected so much and the water discharge range was narrowed. On the other hand, in the vibration generating element 4 in the present embodiment, it has been confirmed that a water discharge range of an appropriate size can be obtained with a relatively wide flow rate.

  Next, as is apparent from the stroboscopic photograph shown in the column (a) of FIG. 7, the hot water discharged from the vibration generating element 4 in the present embodiment has a flow rate of the discharged hot water of 2 m / s to 5 m / s. Even when it is changed between, the deflection angle of the injected hot water is substantially constant. For this reason, in the vibration generating element 4 in this embodiment, even when the flow rate of the discharged hot water is changed, the hot water discharge range is maintained substantially constant. In addition, since the direction of water discharge is smoothly reciprocating, a neat sine wave flow is obtained. For this reason, according to the vibration generating element 4 in the present embodiment, it is possible to obtain shower water that is comfortable to bathe, in which large droplets are discharged uniformly over a wide range.

  On the other hand, in the vibration generating element having the structure shown in FIG. 12 shown in the column (b) of FIG. 7 as a comparative example, as the flow rate of discharged hot water is increased in the range of 2 m / s to 5 m / s, The deflection angle of the injected hot water is large. For this reason, in the vibration generating element having the structure shown in FIG. 12, as the flow rate of the discharged hot water is increased, the hot water discharge range is expanded, and the shower head is inconvenient. In the vibration generating element having the structure shown in FIG. 12, the discharged hot water is reciprocally vibrated, but is curved in an arcuate shape. This is because the change in the discharge direction of hot water is not smooth, the time during which the deflection angle is maximum is long, and the time during which the jet moves between the maximum deflection angles is short. That is, in the vibration generating element having the structure shown in FIG. 12, the amount of water landing around the water discharge range is large, and the amount of hot water is uneven within the water discharge range, resulting in a shower with poor comfort.

Next, referring to the columns (a) to (f) of FIG. 8, various ratios Y / W of the width W of the hot water collision portion 14 and the distance Y from the hot water collision portion 14 to the upstream end of the rectifying passage 10c are variously set. The behavior of the injected hot water when changing to the value of will be described.
First, in the case of Y / W = 1.2 shown in the column (a) of FIG. 8, the injected hot water does not regularly reciprocate, and various large and small droplets are scattered randomly. This is presumably because when Y / W = 1.2, the vortex street passage 10b is too short, so the Karman vortex does not grow sufficiently in the vortex street passage 10b and does not function sufficiently as a vibration generating element. In such a water discharge state, it cannot be used as a comfortable shower. Next, in the case of Y / W = 1.6 shown in the column (b) of FIG. 8, regular reciprocating vibrations appear in the injected hot water. This is thought to be because the Karman vortex grows in the vortex street passage 10b and the hot and cold water vibrates reciprocally because the vortex street passage 10b has a certain length. If it is in such a water discharge state, it can be practically used as a shower.

Furthermore, when Y / W = 2.8 shown in the column (c) of FIG. 8 and Y / W = 7 shown in the column (d) of FIG. 8, Karman vortices are sufficiently grown in the vortex street 10b. Therefore, a clear reciprocating vibration appears in the injected hot water. If it is such a water discharge state, it can be used as a shower with good bathing comfort.
Next, in the case of Y / W = 16 shown in the column (e) of FIG. 8, regular reciprocal vibrations are seen in the injected hot water, but in the columns (c) and (d) of FIG. The amplitude of vibration is smaller than the case. This is probably because the Karman vortex generated in the hot water collision portion 14 is attenuated by the flow resistance or the like while flowing in the vortex street 10b because the vortex street 10b becomes longer. If it is in such a water discharge state, it can be practically used as a shower.

Finally, in the case of Y / W = 17 shown in the column (f) of FIG. 8, almost no reciprocal vibration is observed in the hot water. This is because the vortex street passage 10b has become too long, so that the Karman vortex generated in the hot water collision portion 14 is attenuated by the flow resistance or the like while flowing in the vortex street passage 10b, and the Karman vortex at the spout 4a. It is thought that the influence of is no longer seen. In such a water discharge state, it is considered that there is no practical value as a shower.
From the above, in the vibration generating element 4, the ratio Y / W of the width W of the hot water collision portion 14 and the distance Y from the hot water collision portion 14 to the upstream end of the rectifying passage 10c is about 1.6 or more and about 16 or less. It is preferable to set to.

Next, a shower head according to a second embodiment of the present invention will be described with reference to FIG.
The shower head of this embodiment is different from the first embodiment described above only in the configuration of the passage of the built-in vibration generating element. Accordingly, here, only the points of the present embodiment that are different from the first embodiment will be described, and descriptions of similar configurations, operations, and effects will be omitted.

FIG. 9 is a plan sectional view of a vibration generating element according to the second embodiment of the present invention.
As shown in FIG. 9, the vibration generating element 30 in the present embodiment is different from the first embodiment in that a peeling portion is provided between the vortex street passage and the rectifying passage. Inside the vibration generating element 30, a passage having a rectangular cross section is formed so as to penetrate in the longitudinal direction. The passages are formed as a water supply passage 32a, a vortex passage 32b, and a rectification passage 32c in order from the upstream side.

The water supply passage 32a is a straight passage having a rectangular cross section with a constant cross-sectional area extending from the inlet 30d on the back side of the vibration generating element 30.
The vortex street passage 32b is a rectangular cross-section passage provided downstream of the water supply passage 32a so as to be continuous with the water supply passage 32a. That is, the downstream end of the water supply passage 32a and the upstream end of the vortex street passage 32b have the same size and shape. A pair of opposing wall surfaces (both side surfaces) of the vortex street passage 32b are formed in parallel on the upstream side and tapered on the downstream side so that the cross-sectional area of the flow path decreases toward the downstream end. A tapered portion 32d is provided. That is, the vortex street passage 32b is configured to extend from the upstream end with a constant cross-sectional area and then gradually narrow toward the downstream side.

  The rectifying passage 32c is a rectangular cross-sectional passage provided on the downstream side so as to communicate with the vortex street passage 32b (tapered portion 32d), and is configured to taper so that the flow passage cross-sectional area increases toward the downstream side. Has been. The rectifying passage 32c rectifies hot water including the vortex train guided by the vortex train passage 32b and discharges it from the water outlet 30a. The flow passage cross-sectional area at the upstream end of the rectifying passage 32c is configured to be smaller than the flow passage cross-sectional area at the downstream end of the vortex passage 32b (tapered portion 32d). A step portion 36 which is a peeling portion is formed therebetween. The wall surface of the step portion, which is the surface of the step portion 36, is oriented in a direction orthogonal to the central axis of the vortex street passage 32b. Accordingly, the angle formed between the tapered wall surface (tapered wall surface) and the stepped wall surface of the vortex street passage 32b is greater than 90 ° (90 ° + α °). That is, the peeling portion has a larger angle between the wall surface (step wall surface) constituting the peeling portion and the central axis than the angle formed between the wall surface of the tapered portion 32d of the vortex passage 32b and the central axis line, and The channel cross-sectional area is formed smaller than the downstream end of the vortex street passage 32b. Further, the length of the stepped wall surface is configured to be shorter than the length of the tapered portion wall surface.

  On the other hand, as in the first embodiment, the wall surfaces (ceiling surface and floor surface) facing the height direction of the water supply passage 32a, the vortex passage 32b, and the rectification passage 32c are all provided on the same plane. That is, the heights of the water supply passage 32a, the vortex street passage 32b, and the rectification passage 32c are all the same and constant.

  Next, a hot water collision portion 34 is provided at the downstream end of the water supply passage 32a (near the connection portion between the water supply passage 32a and the vortex passage 32b) so as to close a part of the cross section of the water supply passage 32a. It has been. Since the configuration of the hot water collision unit 34 is the same as that of the first embodiment, the description thereof is omitted. Moreover, since the structure of the collar part 30b and the groove | channel 30c is the same as that of 1st Embodiment, description is abbreviate | omitted.

  By forming the length in the axial direction of the tapered portion 32d of the vortex passage 32b to be longer than the length in the axial direction of the rectifying passage 32c, the change in the discharge range due to the flow rate of the discharged hot water can be sufficiently suppressed. Has been confirmed. Preferably, the length of the taper portion 32d in the axial direction is four times or more than the length of the rectifying passage 32c in the axial direction. Further, the angle formed by the side wall surface of the vortex street passage 32b and the central axis (angle α in FIG. 9) is about 7 °. Preferably, the angle formed between the side wall surface and the central axis is set to about 3 ° to about 25 °. Further, the angle formed by the wall surface of the rectifying passage 32c and the central axis (angle γ in FIG. 9) is about 20 °. The angle γ formed by the wall surface of the rectifying passage 32c and the central axis is preferably set to be larger than the angle of reciprocating vibration of hot water discharged from the water outlet (angle A in FIG. 9). The angle γ is preferably set to about 3 ° or more. By setting the angle in this way, it is possible to suppress the occurrence of the Coanda effect while suppressing the change in the water discharge range accompanying the change in the discharge flow rate.

Furthermore, the flow passage cross-sectional area (the area obtained by subtracting the projected area of the hot water collision portion 34 from the flow passage cross-sectional area of the water supply passage 32a) at the downstream end of the water supply passage 32a partially blocked by the hot water collision portion 34 is The flow passage cross-sectional area of the rectifying passage 32c is larger.
In the present embodiment, a step portion 36 having a channel cross-sectional area smaller than the downstream end of the vortex street passage is formed as a separation portion between the vortex street passage 32b and the rectifying passage 32c. The flow along the wall surface of the row passage 32b can be more effectively separated. As a result, the amount of water discharged within the water discharge range can be made more uniform, and shower water discharged with a comfortable feeling can be obtained.

Next, a shower head according to a third embodiment of the present invention will be described with reference to FIG.
The shower head of this embodiment is different from the first embodiment described above only in the configuration of the passage of the built-in vibration generating element. Accordingly, here, only the points of the present embodiment that are different from the first embodiment will be described, and descriptions of similar configurations, operations, and effects will be omitted.

FIG. 10 is a plan sectional view of a vibration generating element according to the third embodiment of the present invention.
As shown in FIG. 10, the vibration generating element 40 in this embodiment is different from the above-described embodiment in the configuration of the vortex street passage and the configuration of the peeling portion, and the upstream side of the vortex street passage is a passage having a constant cross-sectional area. The angle of the step portion between the vortex street passage and the rectifying passage is different from that of the second embodiment. That is, a passage having a rectangular cross section is formed inside the vibration generating element 40 so as to penetrate in the longitudinal direction. This passage is formed in order from the upstream side as a water supply passage 42a, a vortex street passage 42b, and a rectification passage 42c.

The water supply passage 42 a is a straight passage having a rectangular cross section with a constant cross-sectional area extending from the inlet 40 d on the back side of the vibration generating element 40.
The vortex street passage 42b is a rectangular cross-section passage provided downstream of the water supply passage 42a so as to be continuous with the water supply passage 42a. That is, the downstream end of the water supply passage 42a and the upstream end of the vortex street passage 42b have the same size and shape. A pair of opposing wall surfaces (both side surfaces) of the vortex passage 42b are formed in parallel on the upstream side and tapered on the downstream side so that the cross-sectional area of the flow path decreases toward the downstream end. A tapered portion 42d is provided. In other words, the vortex street passage 42b is configured to extend from the upstream end with a constant cross-sectional area and then gradually narrow toward the downstream side.

  The rectifying passage 42c is a passage having a rectangular cross section provided on the downstream side so as to communicate with the vortex street passage 42b (tapered portion 42d), and is configured to taper so that the flow passage cross-sectional area increases toward the downstream side. Has been. Further, a step portion 46 is provided between the tapered portion 42d of the vortex passage 42b and the rectifying passage 42c, and the step portion wall surface which is the surface of the step portion 46 is constituted by a tapered wall surface. Further, the angle β with respect to the central axis of the stepped wall surface is larger than the angle α with respect to the central axis of the wall surface (tapered wall surface) of the tapered portion 42d, and the flow passage cross-sectional area of the stepped wall surface rapidly decreases toward the downstream side. Tapered to do. Therefore, the downstream end of the tapered portion 42d has the same size and shape as the upstream end of the step portion 46, and the upstream end of the rectifying passage 42c has the same size and shape as the downstream end of the step portion 46. Yes. Further, the length of the stepped wall surface is configured to be shorter than the length of the tapered portion wall surface.

  On the other hand, as in the first embodiment, the wall surfaces (ceiling surface and floor surface) facing the height direction of the water supply passage 42a, the vortex passage 42b, and the rectifying passage 42c are all provided on the same plane. That is, the heights of the water supply passage 42a, the vortex passage 42b, and the rectification passage 42c are all the same and constant.

  Next, a hot water collision portion 44 is provided at the downstream end of the water supply passage 42a (near the connection portion between the water supply passage 42a and the vortex passage 42b) so as to block a part of the cross section of the water supply passage 42a. It has been. Since the configuration of the hot water collision portion 44 is the same as that of the first embodiment, the description thereof is omitted. Moreover, since the structure of the collar part 40b and the groove | channel 40c is the same as that of 1st Embodiment, description is abbreviate | omitted.

  Similarly to the second embodiment, by forming the axial length of the tapered portion 42d of the vortex passage 42b longer than the axial length of the rectifying passage 42c, the discharge range depending on the flow rate of discharged hot water. It has been confirmed that this change can be sufficiently suppressed. Preferably, the length of the tapered portion 42d is formed to be four times or more the length of the rectifying passage 42c. The angle formed between the side wall surface of the vortex passage 42b and the central axis (angle α in FIG. 10) is about 7 °, and the angle formed between the step 46 and the central axis (angle β in FIG. 10) is about 45.゜. Preferably, the angle formed between the side wall surface of the vortex passage 42b and the central axis is set to about 3 ° to about 25 °, and the angle formed between the step portion 46 and the central axis is set to about 40 ° to about 90 °. . Furthermore, the angle formed by the wall surface of the rectifying passage 42c and the central axis (angle γ in FIG. 10) is about 20 °. The angle γ formed by the wall surface of the rectifying passage 42c and the central axis is preferably set to be larger than the angle of reciprocating vibration of hot water discharged from the water outlet (angle A in FIG. 10). The angle γ is preferably set to about 3 ° or more. By setting the angle in this way, it is possible to suppress the occurrence of the Coanda effect while suppressing the change in the water discharge range accompanying the change in the discharge flow rate. Furthermore, the flow passage cross-sectional area (the area obtained by subtracting the projected area of the hot water collision portion 44 from the flow passage cross-sectional area of the water supply passage 42a) at the downstream end of the supply passage 42a partially blocked by the hot water collision portion 44 is The flow passage cross-sectional area of the rectifying passage 42c is larger.

  In the vibration generating element 40 according to the present embodiment, the separation portion is formed by a passage in which a pair of opposing wall surfaces are tapered so that the flow path cross-sectional area is sharply narrowed. Therefore, the vibration generating element 30 according to the second embodiment. The angle at which the side wall surface constituting the passage is bent becomes gentler. According to the experiments by the present inventors, the behavior of hot water injected from the vibration generating element is extremely sensitive to the dimensional accuracy and shape accuracy of the portion where the vortex street passage and the rectifying passage are connected. In particular, it has been clarified that when the peeling portion is formed by bending the wall surface of the passage at a steep angle, the performance of the vibration generating element greatly changes due to variations in the size and shape of the bent wall surface portion.

  In the vibration generating element 40 according to the present embodiment, since the peeling portion is configured by a path in which a pair of opposing wall surfaces are tapered, the molding is relatively easy even when the vibration generating element is integrally formed with an elastic member. The peeling portion can be configured with high dimensional accuracy and shape accuracy. Thereby, the dispersion | variation in the performance of a vibration generation element can be suppressed. Further, by configuring the peeling portion with a path in which a pair of opposing wall surfaces are tapered and avoiding a wall surface bent at a steep angle, the performance of the vibration generating element 40 is less affected by dimensional accuracy and shape accuracy, The vibration generating element 40 having stable performance can be easily manufactured.

  According to the shower head (1) of the embodiment of the present invention, the vibration generating element (4, 30, 40) can reciprocate the hot water discharged from the shower head, so that it has a compact and simple structure. Hot water can be discharged over a wide range from one water outlet. Further, since the water discharge direction can be changed without moving the nozzle to be discharged, there is no problem such as wear of the movable part, and a low-cost and highly durable shower head can be configured. Further, since the vortex passages (10b, 32b, 42b) of the vibration generating element are provided with taper portions (10d, 32d, 42d) in which the cross-sectional area of the flow path is reduced, it greatly depends on the discharged water flow rate of hot water. The shower head can be constructed without changing the water discharge range. Further, since the pair of opposing wall surfaces of the rectifying passages (10c, 32c, 42c) are tapered so that the channel cross-sectional area increases toward the downstream side, the channel cross-sectional area is formed to be reduced. When the flow along the wall surface of the vortex passage flows into the rectifying passage formed so that the cross-sectional area of the flow path is enlarged, the flow is separated from the wall surface. Accordingly, the Coanda effect at the outlet portion of the vibration generating element can be suppressed, the Coanda effect when flowing out from the rectifying passage is suppressed, and the droplets can be distributed uniformly in the water discharge range.

  As mentioned above, although preferable embodiment of this invention was described, a various change can be added to embodiment mentioned above. In particular, in the above-described embodiment, the present invention is applied to a shower head. However, an arbitrary water discharge device such as a faucet device used in a kitchen sink, a wash basin or the like, a hot water washing device provided in a toilet seat, etc. The present invention can be applied to. Further, in the above-described embodiment, the shower head is provided with a plurality of vibration generating elements, but the water discharge device can be provided with an arbitrary number of vibration generating elements according to the application, so that a single vibration is generated. It is also possible to configure a water discharge device including an element.

  In the embodiment of the present invention described above, the shape of the passage in the vibration generating element has been described using terms such as “width” and “height” for convenience, but these terms refer to the vibration generating element. The direction in which it is provided is not specified, and the vibration generating element can be used in any direction. For example, the vibration generating element can be used with the “height” direction in the above-described embodiment oriented in the horizontal direction.

DESCRIPTION OF SYMBOLS 1 Shower head which is the water discharging apparatus of 1st Embodiment of this invention 2 Shower head main body (water discharging apparatus main body)
DESCRIPTION OF SYMBOLS 4 Vibration generating element 4a Water discharge port 4b Gutter part 4c Groove 4d Inflow port 6 Water flow path formation member 6a Shower hose connection member 6b Packing 8 Vibration generation element holding member 8a Element insertion hole 10a Water supply path 10b Vortex array path 10c Rectification path 10d Taper part DESCRIPTION OF SYMBOLS 14 Hot water collision part 30 Vibration generating element 30a Water outlet 30d Inlet 32a Water supply path 32b Vortex line path 32c Rectification path 32d Tapered part 34 Hot water collision part 36 Step part (peeling part)
DESCRIPTION OF SYMBOLS 40 Vibration generating element 40a Water discharge port 40d Inflow port 42a Water supply path 42b Vortex line path 42c Rectification path 42d Tapered part 44 Hot water collision part 46 Step part 102 Injection nozzle 102a Injection port 104 Feedback flow path 110 Front chamber 110a Wall surface 110b Wall surface 112 Outlet 114 Entrance hole 116 Obstacle

Claims (5)

A water discharge device that discharges hot water from a water discharge port while reciprocating,
A water discharge device body;
A vibration generating element that is provided in the water discharge device main body and discharges the supplied hot and cold water while reciprocatingly vibrating,
The vibration generating element is
A water supply passage through which hot water supplied from the water discharge device body flows, and
It is arranged at the downstream end of the water supply passage so as to close a part of the cross section of the water supply passage, and the hot water guided by the water supply passage collides with the downstream side alternately. Hot water collision part that generates vortex of
A vortex street passage that is provided downstream of the water supply passage and guides the vortex formed by the hot water collision portion while growing;
Provided downstream of the vortex street passage, so the flow channel cross-sectional area is enlarged toward the downstream side, it has a rectifier path in which a pair of walls provided with taper faces, the,
The small without even part of the downstream side of the vortex passage, the flow path cross-sectional area is opposed to reduced toward the downstream side, a pair of tapered walls are configured,
Between the tapered wall surface of the vortex street passage and the rectifying passage, a peeling portion is formed for peeling the flow along the inner wall surface of the vortex street passage from the wall surface,
The release unit, the flow path cross-sectional area than the downstream end of the wall described above taper of the vortex passage is configured so as to reduce towards the downstream side,
The water discharging device according to claim 1, wherein an angle formed between a wall surface constituting the peeling portion and a central axis is configured to be larger than an angle formed between the tapered wall surface of the vortex passage and the central axis .   The water discharge device according to claim 1, wherein the peeling portion includes a passage connecting the vortex street passage and the rectifying passage, wherein a pair of opposing wall surfaces are tapered.   The vortex passage is formed such that the ratio of the width W of the hot water collision portion to the distance Y from the hot water collision portion to the upstream end of the rectifying passage is Y / W = 1.6 to 16. The water discharging apparatus according to claim 1 or 2.   The water discharge device according to any one of claims 1 to 3, wherein the water supply passage, the hot water collision portion, the vortex street passage, and the rectifying passage are configured by an integrally formed elastic member.   The water supply device according to any one of claims 1 to 4, wherein the water supply passage is configured to have a constant cross-section.