JP4889101B2 - Water discharge device - Google Patents

Description

The present invention relates to a water discharge device, and more particularly to a water discharge device that can be suitably used as a cleaning nozzle of a sanitary cleaning device that discharges supplied wash water from a predetermined water discharge port.

A conventional water discharging apparatus, for example, a human body hygiene cleaning apparatus that cleans a local part of a human body, discharges water from the water outlet to the human body and removes dirt with the cleaning water. The water flow of the washing water can be adjusted, and the user can raise the water flow to quickly remove the dirt or perform washing with a stimulating and strong water discharge. In addition, the water flow can be lowered and washing can be performed with soft water discharge, and the desired water discharge can be selected by changing the water flow in this way.

In addition, some pulsation is applied to the wash water to discharge water, increasing the detergency and saving water by reducing the amount of water used compared to discharging water without pulsation. There is a human body cleaning device that saves heat and saves energy. In this case, the user may want to wash with a strong water flow at a low flow rate. In order to realize water discharge that meets these requirements, it is necessary to pass a small flow rate of washing water at an increased flow rate. For example, a pulsating electromagnetic pump is used, which increases the cost. It was.

There is also known a water discharge device that periodically changes the water discharge position without using electrical drive. A swirling chamber into which the cleaning water flows into the cleaning nozzle, a water supply unit to which the cleaning water is supplied along the peripheral surface of the swirling chamber, an opening provided at the upper end of the swirling chamber, and one end thereof A water discharge body in which a water discharge flow path is formed so that the wash water supplied to the swirl chamber can be discharged from one end side, and a flexible gripping body that holds the water discharge body. Equipped with the kinetic energy of the wash water supplied to the water supply unit and the lift and centrifugal force generated by this kinetic energy to swing the water spouting body in the swirl chamber and to concentrate the wash water in one place However, there is a cleaning nozzle that discharges cleaning water over a certain range and performs cleaning with a small amount of cleaning water and ensuring a cleaning strength and a wide cleaning area. (For example, refer to Patent Document 1.)

In this case, for example, the user seeks a strong feeling of washing with stimulation, and when the washing flow rate is increased, the period of the swing motion (hereinafter referred to as the revolution frequency) is also accelerated, and the washing flow rate is increased. Regardless of this, there is a problem that the amount of deformation of the skin is not sufficient due to the short landing time in the human body, and the user cannot obtain a sufficient feeling of cleaning desired by the user.
JP 2003-176560 A

In the conventional water discharge device, for example, the cleaning nozzle having the above-described structure, the following adjustments have been made in order to achieve the feeling of cleaning desired by the user.
When the user desires a strong washing feeling with stimulation, in order to achieve the washing feeling at the set maximum water force, the period of the swing motion (hereinafter referred to as the revolution frequency) is set to a low speed. For example, as a result of experiments, it has been found that when the revolution frequency with respect to the set water flow is set to about 100 Hz or less, a stimulating cleaning strength is achieved. In this case, as means for adjusting the revolution frequency, the kinetic energy imparted to the water spouting body can be increased by increasing the area of the water supply section and reducing the flow rate of the washing water flowing into the swirl chamber, The revolution frequency is adjusted by increasing the specific gravity and increasing the lift and centrifugal force generated by the kinetic energy.

However, the revolution frequency depends on the set water flow rate, the specific gravity of the water spouting body and the shape of the water supply unit that generates kinetic energy, and the washing flow rate. There was a problem that it could not be controlled independently.

For example, FIG. 8A showing the relationship between the revolution frequency and the cleaning strength and FIG. 8B showing the relationship between the set flow rate of the sanitary washing apparatus and the revolution frequency will be described below.
As shown in FIG. 8 (a), the relationship between the revolution frequency and the cleaning strength is such that when the revolution frequency is high, the cleaning strength is reduced (weak), and when it is small, the cleaning strength is increased (strong). Yes. In addition, as shown in FIG. 8B, the relationship between the set flow rate and the revolution frequency is known to increase as the set flow rate increases.

Considering the setting of the water flow and the feeling of cleaning according to the user's request, it is desirable that the revolution frequency is minimized when the cleaning flow rate is maximum, and the revolution frequency is minimized when the cleaning flow rate is minimum. However, since the revolution frequency is the minimum when the set flow rate is the minimum and the revolution frequency is the maximum when the maximum is the maximum, as is understood from the relationship of FIGS. Could not be used.

In addition, when the target revolution frequency is set at the maximum set flow rate with the revolution frequency adjusting means (for example, the specific gravity of the water spouting body), the kinetic energy is insufficient at the minimum set flow rate, and stable swing motion can be secured. In addition, there has been a problem of intensive cleaning of one place.

The present invention has been made to solve the above-described problem, and it is an object of the present invention to provide a water discharger that can independently control the revolution frequency and the flow rate of cleaning water.

In order to achieve the above object, according to the first aspect of the present invention, there is provided a water discharge device that includes a nozzle and that discharges the supplied cleaning water from the nozzle, the nozzle including a swirling chamber into which the cleaning water flows, A first water supply unit that supplies cleaning water along the circumferential surface of the swirl chamber, an opening provided at an upper end of the swirl chamber, and one end portion disposed on the opening side, and the swirl inside A water discharge body formed with a water discharge flow passage that allows water to be discharged from one end side of the washing water supplied to the chamber, and a flexible grip body that holds the water discharge body, and is supplied from the first water supply section In the water spouting device in which the water spouting body swings in an inclined posture in the swirl chamber by the kinetic energy of the washed water, the water spouting body has a water supply port for supplying the swirl chamber wash water to the water discharge channel. Formed and opened at a position facing the water inlet of the water spouting body. Has a part, by having a second water supply unit for supplying water to the washing water in the swirling chamber from said opening, provided in a state in which water has been cleaned water is distributed to the second water supply unit and the first water supply unit It is, since the water discharge body is to supply wash flow rate necessary for generating the oscillating motion to the first water supply unit and configured to supply the second water supply unit which does not impart other cleaning flow to swinging motion, neck The period of the swing motion (hereinafter referred to as revolution frequency) can be controlled independently of the cleaning flow rate.

Moreover, it has a flow rate adjustment part which adjusts the flow rate ratio of said 1st water supply part and said 2nd water supply part by having a flow rate adjustment part which adjusts the flow rate ratio of said 1st water supply part and said 2nd water supply part. By adjusting the flow rate ratio between the first water supply port and the second water supply port, the revolution frequency can be set independently of the cleaning flow rate.

In addition, the first water supply unit and the second water supply unit are provided at different height positions of the swirl chamber, so that the swirl chamber circle that swings the water spouting body generated in the first water supply unit. It is possible to form a flow that does not interfere with the flow generated along the circumference.

According to the present invention, by making the cleaning flow rate and the revolution frequency independent, the user desires a strong and clean feeling of stimulation, and without increasing the revolution frequency at the same time when the cleaning flow rate is increased (each water flow By setting the revolution frequency (optimal for setting), it becomes possible to achieve a strong washing feeling with stimulation at the time of the maximum water flow, and the water spouting body that has been used as the means for adjusting the revolution frequency in the conventional water spouting device By reducing the specific gravity of the first water supply section or by reducing the cross-sectional area of the first water supply part, the revolution frequency of the low water force is increased, and while achieving a feeling of washing and a feeling of washing with softness and volume, the above means, An effect is obtained that it is possible to achieve a strong washing feeling with stimulation at the time of maximum water.

In addition, according to the present invention, it is possible to vary the feeling of cleaning at a certain cleaning flow rate, so that there is no need for a flow rate adjusting means for changing each water flow, and the heat exchanger for warming the cleaning water Since this control becomes easy, there are effects such as space saving and cost reduction.

Next, an embodiment of a water discharge device and a human body hygiene cleaning device according to the present invention will be described based on examples. FIG. 1: shows the perspective view at the time of installing the human body hygiene washing | cleaning apparatus 300 provided with the water discharging apparatus of this invention in the toilet bowl. The user performs cleaning with the cleaning water discharged from the cleaning nozzle, and operates the human body cleaning apparatus 300 at the remote control operation unit 7 shown in the drawing. FIG. 2 is a block diagram showing a schematic configuration of the local cleaning device 300 of the present embodiment.

As shown in FIG. 2, the local cleaning apparatus 300 includes a water supply unit 302, a heat exchange unit 304, a flow control valve 306, and a cleaning nozzle 308 in order from the external water supply source side. The cleaning nozzle 308 is configured to move back and forth between a standby position in the apparatus main body and each of the buttocks or bidet cleaning positions by a nozzle drive motor 310.

The flow control valve 306 is connected to the rear end of the cleaning nozzle 308. A flow path / flow rate ratio switching mechanism 71 is incorporated in the rear end portion of the cleaning nozzle 308. The flow path / flow rate ratio switching mechanism 71 is mounted integrally with the nozzle end. A nozzle head 200 is attached to the tip of the cleaning nozzle 308, and a butt cleaning water discharge hole 31 and a bidet cleaning water discharge hole 33 are formed in the nozzle head 200.

The local cleaning device 300 sends the cleaning water whose flow rate is adjusted by the flow control valve 306 to the cleaning nozzle 308 via the flow path / flow rate ratio switching mechanism 71, and the butt cleaning water discharge hole 31 and the bidet cleaning water discharge hole 33. Water is discharged from.

As shown in FIG. 2, the local cleaning device 300 includes an electronic control device 312. The electronic control unit 312 adjusts the cleaning flow of the human body cleaning device, the buttocks cleaning button 91 and the bidet cleaning button 93 provided on the remote control operation unit 7, the flow rate adjustment button (Δ, ▽ on the upper side of the remote control 7 in FIG. 2). Can send and receive electrical signals to and from the water button (△, ▽ on the lower side of the remote control 7 in FIG. 2), the water supply unit 302, the heat exchange unit 304, the flow control valve 306, the cleaning nozzle 308, and the nozzle drive motor 310. It is connected to the.

The electronic control device 312 adjusts the forward / backward drive of the cleaning nozzle 308, the supply and stop of the cleaning water, the warming of the cleaning water, the adjustment of the cleaning water flow, and the cleaning strength according to the operation of each operation button. Performs control such as flow ratio switching adjustment.

Washing water (tap water) sent from a water supply source (water pipe) is guided to the water supply unit 302 and reaches a downstream heat exchange unit 304 through trapping of dust or the like with a strainer included in the unit 302. The water supply unit 302 includes a check valve (not shown), a pressure regulating valve for regulating pressure, and an electromagnetic valve for opening and closing the pipeline in the pipeline. Therefore, when the circuit is opened by the electromagnetic valve, the washing water flows into the instantaneous heating type heat exchange unit 304 in a state of being regulated to a predetermined pressure by the pressure regulating valve. In addition, a relief valve (not shown) is provided in the pipe line from the water supply unit 302 to the heat exchange unit 304, so that an inadvertent increase in the pressure in the pipe line is avoided.

The heat exchange unit 304 is configured to instantaneously warm the wash water that passes through the energization of the built-in heater. Note that a bimetal switch or a thermal fuse (not shown) for preventing the abnormal heating is mounted on or near the built-in heater. In addition, a float switch for preventing idling and a vacuum breaker for preventing backflow of cleaning water from the cleaning nozzle side are installed.

In this case, the heat exchanging unit 304 detects the temperature of the inflow / outflow wash water with a water temperature sensor (not shown), and warms the wash water to the set temperature wash water with the built-in heater. The washing water heated in this way is subjected to flow adjustment to a predetermined flow rate by the flow control valve 306 and then sent to the washing nozzle 308 via the flow path / flow rate ratio switching mechanism 71.

Next, the configuration of the cleaning nozzle 308 will be described with reference to FIGS. 3A is a cross-sectional view of the nozzle head 200 when water is not passed, FIG. 3B is a cross-sectional view of the nozzle head 200 when water is passed, and FIGS. 4A and 4B are FIG. It is AA sectional drawing.

When the cleaning water is supplied to the cleaning nozzle 1, it passes through the water passage 62 in the nozzle head 200, the swirl chamber inflow passage 63, and the lower swirl chamber 64 a in the swirl chamber 64 in this order.

The swirl chamber inflow passage 63 is configured to have a smaller water flow cross-sectional area than the water flow passage 62, and is configured to be eccentric with respect to the center of the swirl chamber 64 and to supply cleaning water.

Further, a cleaning water flow path different from the water flow path 62 is formed in the nozzle head 200. In the water passage 82 in the nozzle head 200, the opening 84 for supplying the supplied wash water to the upper swirl chamber 64 b in the swirl chamber 64 has a cross-sectional area of the water passage 82 in the member 91 having the opening 84. One or more larger openings are formed, and the openings 84 are supplied to the upper swirl chamber 64b. The opening 84 is opposed to a water supply port 73 of the water spouting body 70 described later, and the opening 84 and the force receiving portion 72 of the water spouting body 70 have a difference in positional relationship. For this reason, the wash water from the opening 84 does not impart kinetic energy that causes the swinging motion described later to the spouting body 70.
Here, the water passage 62 corresponds to the “first water supply section”, and the water passage 82 corresponds to the “second water supply section”.

A water spouting body 70 is provided inside the swirl chamber 64, and the water spouting body 70 communicates with a water supply port 73 to which the cleaning water is supplied to discharge the spout water, and the cleaning in the lower swirl chamber 64 a. It is comprised by the force receiving part 72 which receives the flow energy from water. The water supply port 73 opened on the side surface of the water discharge body 70 and the water discharge port 71 opened on the upper surface of the water discharge body 70 communicate with each other through the water discharge flow path.

A retaining member 75 having a through hole 75a in the center is provided integrally with the cleaning nozzle 61 on the upper part of the swirl chamber 64b. The retaining member 75 is inclined and revolved with respect to the central axis in the swirl chamber 64b. The upper part of the turning member 70 is supported by the through hole 75a so as to be possible.

Accordingly, the wash water is supplied into the swirl chamber 64 from the swirl chamber inflow path 63 and the centrifugal force generated by swirling the wash water inside the swirl chamber 64 and the kinetic energy of the wash water are received by the force receiving portion 72 of the water spouting body 70. The water discharger 70 is configured to revolve (swing motion) while being inclined with respect to the central axis of the swirl chamber 64, and the water supply that is not applied to the centrifugal force and kinetic energy from the swirl inflow path 84. Is made.

The trajectory of the cleaning water discharged with the above configuration will be described with reference to FIG. 5. The water discharging body 70 was discharged by jetting and discharging the cleaning water while performing a revolving motion around the central axis of the swirl chamber 64. The trajectory of the washing water expands and discharges in a conical shape while drawing a spiral.

Here, the period of the cleaning trajectory obtained by jetting and discharging the cleaning water while performing the revolving motion of the cleaning water is defined as the revolution frequency, and the revolution frequency and the water discharge form will be described.

6 (a), 6 (b), and 6 (c), the revolution frequency was adjusted under the condition of a constant flow rate, and washing water was discharged toward the skin (palm) to confirm the deformation state of the skin. It is an experimental result. 6A shows a case where the revolution frequency is 30 Hz, FIG. 6B shows a case where the revolution frequency is 80 Hz, and FIG. 6C shows a case where the revolution frequency is 100 Hz. From this experiment, it was confirmed that the skin deformation was large when the revolution frequency was low, and that the deformation was small when the revolution frequency was low. This indicates that when the revolution frequency is high, the water discharge moves before the skin deformation of the water landing portion occurs, and the skin does not deform. When the revolution frequency is low, sufficient skin deformation occurs.

In addition, according to the interviews with the subjects, it was confirmed that the lower the revolution frequency, the stronger the feeling of washing, and the higher the revolution frequency, the less the feeling of washing. This is presumably because the skin deformation is caused by the feeling of washing as described above.

Next, the relationship between the feed water flow rate and the revolution frequency in the present invention is shown in FIG. The flow rate Q supplied to the nozzle 308 is distributed, the flow rate supplied to the water passage 62 is Q1, the flow rate supplied to the water passage 82 is Q2, and the flow rate and flow ratio supplied to each water passage. Is adjusted, the revolution frequency is proportional to the flow rate of the supply water from the water passage 62 contributing to the revolution frequency. For example, the revolution frequency is fa for the low water washing flow rate Qa and fb for the high water washing flow rate Qb. Revolution frequency. Moreover, since the flow velocity of the washing water supplied to the swirling inflow portion is increased by reducing the cross-sectional area of the swirling inflow passage 63 connected to the water flow passage 62 that forms kinetic energy, the motion that governs the revolving motion. The energy increases, and the revolution frequency can be increased to fc and fd even at the same flow rate. Further, since it is known that the revolution frequency fc can be secured by setting the flow rate Q1 supplied to the water passage 62 to Qa, let's obtain the revolution frequency of fe at the high water flow rate Qb. In this case, the flow rate Q2 supplied by the water passage 82 may be Q2 = Qb−Qa.

Further, the cleaning flow rate shown in FIG. 7 is adjusted to a predetermined flow rate by a flow control valve, which will be described later, but by having the configuration of the present invention, it is supplied to the water passage 62 and the water passage 82 even under a constant flow rate condition. The same result can be obtained simply by controlling the flow rate and the flow rate ratio using the flow rate ratio switching mechanism 72 described later.

The flow rate ratio switching mechanism 72 supplies cleaning water to the water passage 62 and the water passage 82 of the cleaning nozzle 1 as described above, and can supply water to both the passage 62 and the water passage 82 simultaneously. Yes, when the water is supplied, the flow rate ratio between the flow rates Q1 and Q2 for each path is adjusted.

As shown in FIG. 9, the flow rate ratio switching mechanism 71 selects, from the nozzle side, a stator 2a having a communication hole communicating with each path in the nozzle, and each communication hole of the stator 2a that rotates for channel switching. The rotor 2b is opened, the coupling 2d is for transmitting rotation to the rotor 2b, and the spring 2c is used to bias the rotor 2b toward the stator 2a.

FIG. 10 is a view showing an open state of each communication hole when the flow rate ratio switching mechanism 71 is viewed from the lower side of the stator 2a (the side not in contact with the rotor 2b). In the stator 2a, as shown in FIG. 10A, the first communication hole 2f communicating with the water passage 62 in the cleaning nozzle 1 in order in the direction of the arrow L, the second communication hole 2g communicating with the water passage 82, the bidet A third communication hole 2h communicating with the path 207 is opened.

As shown in FIG. 10B, the rotor 2b has a notch 2i that can selectively open the communication holes 2f, 2g, and 2h that are opened in the stator 2a, and the notch 2i is connected to the communication holes 2f, 2g, The communication holes 2f, 2g, and 2h are opened by overlapping with the opening of 2h. The notch 2i can be in a state where both the first communication hole 2f and the second communication hole 2g overlap and communicate with each other, and at the same time, the first communication hole 2f and the second communication hole 2g do not overlap. Furthermore, it has a width that allows communication with only the third communication hole 2h.

In such a structure of the stator 2a and the rotor 2b, the rotor 2b is rotated in the direction of the arrow R with respect to the stator 2a, and the notch 2i of the rotor 2b, the first communication hole 2f, and the opening of the second communication hole 2g are formed. When the overlapping state is continuously changed, the area where the opening of the first communication hole 2f is opened is increased, and conversely, the area where the opening of the second communication hole 2g is opened is reduced. At this time, the water supply flow rate Q1 to the water passage 62 increases, and the water supply flow rate Q2 to the water passage 82 decreases. On the other hand, when the rotor 2b is rotated in the direction of the arrow L, the area where the opening of the first communication hole 2f is opened is reduced, and accordingly, the area of the opening of the second communication hole 2g is increased.

At this time, the water supply flow rate Q1 to the water passage 62 decreases, and the water supply flow rate Q2 to the water passage 82 increases. This makes it possible to continuously adjust the water supply flow rates Q1 and Q2 to the water passage 62 and the water passage 82. Specifically, as shown in FIG. 10 (c), when the center of the notch 2i is located in the middle between the first communication hole 2f and the second communication hole 2g, the rotation angle is 0 °. When the shapes of the communication hole 2f and the second communication hole 2g are the same, when the rotor 2b is rotated in the arrow R direction with respect to the stator 2a as shown in FIG. 10 (d), the first communication hole 2f Since the open area of the second communication hole 2g and the open area of the second communication hole 2g become small at the same time, the feed water flow rate to the water passage 62 can be increased and the feed water flow rate to the water passage 82 can be decreased. In addition, the part which is painted black on a figure is a site | part which the communicating holes 2f, 2g, 2h and the notch 2i communicate. When the rotor 2b is rotated in the direction of arrow L with respect to the stator 2a as shown in FIG. 10 (e), the water supply flow rate to the water passage 62 decreases and the water supply flow rate to the water passage 82 increases.

Further, as shown in FIG. 10 (f), the rotor 2b can make all of the notches thereof not overlap any of the communication holes of the stator 2a, thereby supplying cleaning water to the nozzles. You can also stop.

For the convenience of discharging (draining) the water remaining in the nozzle, the rotor 2b has a notch 2j that can overlap all the communication hole openings as shown in FIG. 10 (g). When draining, all the communication holes 2f, 2g, and 2h can be opened by the notches 2i and 2j as shown in FIG. 10 (h).

As shown in FIG. 9, the coupling 2d is attached to the rotation shaft of the drive motor 2e of the flow rate ratio switching mechanism 71, and the rotation shaft pin 2k is positioned in the slit 21. The coupling 2d engages the rotary key 2m with the slit 2n of the rotor 2b. Therefore, when the drive motor 2e rotates forward and backward, the rotation is transmitted to the coupling 2d by the rotation shaft pin 2k and to the rotor 2b by the rotation key 2m. Then, by the rotation of the rotor 2b, the notch 2i selectively opens the communication holes 2f, 2g, 2h as described above, and adjusts the flow rate of the cleaning water fed to each path of the nozzle. That is, the electronic control unit 6 controls the rotation of the drive motor 2e and adjusts the flow rate ratio of the cleaning water fed into each path of the nozzle as described above.

The flow rate ratio switching mechanism 71 and the flow rate adjustment valve 306 described above can be used to control the flow rate ratio with respect to a predetermined flow rate, which is necessary for securing a desired revolution frequency in the water passage 62. The revolving frequency can be controlled independently of the feed water flow rate.

It is a perspective view at the time of installing the human body hygiene washing | cleaning apparatus 300 in a toilet bowl. 2 is a block diagram illustrating a schematic configuration diagram of a human body hygiene cleaning apparatus 300. FIG. It is the longitudinal cross-sectional view of the nozzle head 200 installed in the nozzle apparatus 308 of an Example, (a) is a non-water-permeable state, (b) is sectional drawing in a water-permeable state. It is AA sectional drawing shown by sectional drawing of the nozzle head 200 installed in the nozzle apparatus 308 of an Example. It is a figure which shows the water discharge form in an Example. The experimental result which investigated the revolution frequency and the deformation state of the skin is shown. (A) is a revolution frequency 30Hz, (b) is a revolution frequency 80Hz, (c) is a figure which shows the skin deformation | transformation state at the time of water discharge of the revolution frequency 180Hz. It is a figure which shows the relationship between the flow volume of the wash water and revolution frequency in an Example. (A) is a figure which shows the relationship between the revolution frequency and the washing | cleaning flow volume in the conventional water discharging apparatus, (b) is a figure which shows the relationship between the revolution frequency and the washing | cleaning flow volume. The disassembled schematic perspective view of a flow-path flow ratio switching mechanism is shown. It is a figure which shows the open state of each communicating hole seeing the flow-path flow ratio switching mechanism 71 from the lower side (side which does not contact the rotor 2b) of the stator 2a.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Nozzle 62 1st water supply part 64 Swirling chamber 64a Upper swirl chamber 64b Lower swirl chamber 70 Water spouting body 71 Flow path / flow rate ratio switching mechanism (flow rate adjusting unit)
72 Grasping body 82 Second water supply portion 84 Opening portion

Claims (3)

A water discharge device that includes a nozzle and discharges supplied cleaning water from the nozzle, the nozzle supplying a cleaning water along a swirling chamber into which the cleaning water flows and a circumferential surface of the swirling chamber. A water supply unit, an opening provided at the upper end of the swirl chamber, and one end portion are disposed on the opening portion side, and the cleaning water supplied to the swirl chamber can be discharged from the one end side inside. A water discharge body in which a water discharge flow path is formed; and a flexible gripping body that holds the water discharge body. The water discharge body is moved in the swirl chamber by the kinetic energy of the cleaning water supplied from the first water supply section. In a water discharge device that swings in an inclined posture,
The water spouting body is formed with a water supply port for supplying the cleaning water of the swirl chamber to the water discharge channel, and has an opening at a position facing the water supply port of the water spouting body. A water discharge device having a second water supply unit for supplying cleaning water.   The water discharging apparatus according to claim 1, further comprising a flow rate adjusting unit that adjusts a flow rate ratio between the first water supply unit and the second water supply unit.   The water discharging apparatus according to claim 1, wherein the first water supply section and the second water supply section are provided at different height positions of the swirl chamber.

Images