JP2003096882A - Washing nozzle and sanitary washing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sanitary washing nozzle in which a water flow with a pulsation feeling can be obtained, and moreover, comfortability can be obtained by relieving a concentration feeling, and a sanitary washing device. SOLUTION: Since a jet 30 is provided at a position parallel to a rotating shaft 27 of a rotating means 29 having a plurality of water receiving blades 28, washing water discharged from the jet 30 forms an intermittent flow by a chopper action from the rotation of the rotating means 29, and as a result, the water flow with the pulsation feeling can be obtained, and at the same time, the washing water forms an inverted conical jet stream around the axial center of the jet 30, thereby, the concentration feeling is relieved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning nozzle used for a sanitary cleaning toilet seat or the like for cleaning a human body part and a sanitary cleaning device suitable for the cleaning nozzle.

[0002]

2. Description of the Related Art Conventionally, as a sanitary washing device of this type for washing a human body, one for washing hot water from a washing nozzle having a single or a plurality of nozzle holes, or as shown in FIG. There is an intermittent control valve provided in the above to intermittently eject the cleaning water to obtain a massage-like cleaning feeling (for example, Japanese Utility Model Laid-Open No. 60-130883).

In FIG. 1, reference numeral 1 is a hot water tank for storing wash water heated by a heater 2. A cleaning nozzle 3 is provided with a movable nozzle body 6 that is moved into the cylinder 4 by water pressure and can be stored in a retracted position by a spring 5, and an ejection hole 7 is provided at the tip of the movable nozzle body 6. Has been.

On the other hand, the water passage 8 is provided with an on-off valve 9 and an intermittent control valve 10 for intermittently ejecting washing water, and an output from a pulse generator 12 connected to a power source via a switch 11. The cleaning water can be intermittently discharged according to the level.

In the above structure, the pulse generator 12 controls the intermittent control valve 10 to eject a cleaning jet whose intensity pulsates intermittently from the ejection hole 7 to obtain a massage-like feeling of cleaning.

[0006]

However, in the above-mentioned conventional sanitary washing device, a special intermittent control valve and pulse generator are required to improve the comfort associated with the feeling of massage, which makes the device large and complicated. It was connected.

Further, since a single nozzle hole discharges intermittently,
A concentrated strong water flow was discharged intermittently, which was a problem that lacked comfort.

The present invention solves the above-mentioned problems of the prior art. A pulsating water flow can be obtained without the need for a special member such as an intermittent control valve. To provide a cleaning nozzle and a sanitary cleaning device that can be used.

[0009]

In order to solve the above-mentioned conventional problems, a sanitary washing device of the present invention has a plurality of water receiving blades, a rotating means for rotating by a water flow from a water supply channel, and the rotating means. The cleaning nozzle has an ejection hole provided in a position parallel to the rotation axis, and the rotation of the rotating means causes the water receiving wall to intermittently close the ejection hole to a substantially closed state.

As a result, the water flow acts on the plurality of water receiving blades to rotate the rotating means, and the plurality of water receiving blades sequentially block the ejection holes provided at positions parallel to the rotation axis of the rotating means. By the chopper action, the cleaning water discharged from the ejection holes becomes an intermittent flow, and a pulsating water flow is obtained.

Further, in the process in which one water receiving blade blocks the jet hole, the jet flow is deflected by the end face of the water receiving blade to form a reverse conical jet flow centered on the axial center of the jet hole, thus alleviating the feeling of concentration. This improves the comfort during cleaning.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 has a plurality of water receiving blades, and is provided at a position parallel to a rotating means for rotating by a water flow from a water supply passage and a rotating shaft of the rotating means. Since it has an ejection hole and is configured such that the ejection hole can be intermittently closed by the water receiving wall by the rotation of the rotating means, the water flow acts on the plurality of water receiving blades to rotate the rotating means,
The plurality of water receiving blades sequentially block the jet holes provided in the position parallel to the rotation axis of the rotating means, and the chopper action causes the wash water discharged from the jet holes to be an intermittent flow, resulting in a pulsating water flow. can get.

Further, the amount of water per unit time is reduced by intermittently closing the jet holes intermittently, and the internal pressure of the washing nozzle is intermittently increased, so that the jetting speed is increased and a predetermined amount of water can be obtained with a small amount of water. A feeling of cleansing can be obtained.

Furthermore, in the first process until one end surface of the water receiving blade reaches the center of the jet hole, the discharged water flow is deflected in the direction opposite to the advancing direction of the water receiving blade, and the center of the jet hole and the water receiver. In the second process in which the centers of the blades are substantially coincident with each other, the ejection holes are in a substantially closed state to limit water discharge, and in the third process in which the other end surface of the water receiving blade is far from the center of the ejection holes, the water flow discharged is It is deflected in the same direction as the advancing direction of the water receiving blade. That is, these processes are continuously repeated by a plurality of water receiving blades to form a reverse conical jet flow centered on the axial center of the jet hole, which reduces the feeling of concentration and improves comfort during cleaning. .

According to a second aspect of the present invention, in the cleaning nozzle configuration according to the first aspect, since the water is intermittently discharged from the ejection holes at a frequency proportional to the number of water receiving blades and / or the water amount, the adjustment range of the water amount is determined. By adjusting the number of water receiving blades accordingly, a suitable discharge frequency range can be set easily and perceptually. The lower the discharge frequency, the easier it is to perceive, and the higher the discharge frequency, the closer to a continuous flow.However, as the strong water pressure, that is, the amount of water increases, the number of rotations of the rotating means increases proportionally and the discharge frequency increases. , The feeling of strong water is alleviated. In addition, the discharge frequency is preferably 1 Hz to 60 Hz, and more preferably 5 Hz to 20 Hz.

According to a third aspect of the present invention, in the cleaning nozzle structure according to the first aspect, the number of water receiving blades is 3 to 8. When the number of water receiving blades is 3 or less, a smooth rotation operation is performed. If the number of sheets is 8 or more, a good rotation operation can be realized, but in this type of sanitary washing device, the ejection frequency becomes too high, and a suitable sensation cannot be obtained.

According to the fourth aspect of the present invention, since the predetermined gap g is provided between the ejection hole and the end surface of the water receiving blade, if the rotating means stops in a state of blocking the ejection hole due to foreign matter or the like. Also in this case, it is possible to prevent the gap g from functioning as a passage and discharging a predetermined amount of cleaning water from the ejection hole to make cleaning impossible.

According to the fifth aspect of the invention, since the air suction port is provided in the vicinity of the ejection hole, air is mixed into the cleaning water by the ejector action by the water discharged from the ejection hole. As a result, the feeling of flow rate is increased, and washing with a small amount of water becomes possible.

The invention according to claim 6 has a water supply means, a heating means for heating the wash water, and a water supply passage communicating with the water supply means, and jets the wash water toward the human body part. The cleaning nozzle according to any one of claims 1 to 5, a nozzle driving unit that drives the cleaning nozzle to move forward and backward, and a control unit. Therefore, the rotating unit is rotated by the water flow, and the plurality of water receiving blades sequentially pass through the ejection holes. As a result of the blockage, the washing water discharged from the ejection holes becomes an intermittent flow due to the chopper action, and a pulsating water flow is obtained.By intermittently closing the ejection holes, the amount of water per unit time is reduced. Then
In addition, since the internal pressure of the cleaning nozzle increases intermittently, the ejection speed increases, and a sanitary cleaning device capable of obtaining a predetermined cleaning feeling with a small amount of water can be realized.

According to a seventh aspect of the invention, the heating means in the sixth aspect is of an instantaneous type in which the heater is energized only when in use, and intermittent water discharge is achieved by the chopper action by the rotation of the rotating means provided with the water receiving blade. By realizing the above, the flow rate can be reduced and instantaneous heating with a commercial 100v power source becomes possible.

The current value that can be obtained with a commercial 100v power source is 12A
The flow rate of water at 5 ° C. at this current value that can be instantaneously boiled in a water-flowing state to a temperature suitable for human body part cleaning at 40 ° C. is about 0.5 l / min. The hot water storage type requires a maximum amount of washing water of 1 l / min or more, and by using the washing nozzle, a washing feeling equivalent to that of the hot water storage type can be realized with a water amount of about 0.5 l / min.

As a result, the hot water will not run out even if it is used continuously, and the hot water storage tank will not be required, so the overall size of the device can be reduced, and further, the electric energy loss for keeping the hot water stored can be prevented to save energy. Can be achieved.

According to the eighth aspect of the present invention, since the pump capable of intermittently pressurizing and discharging water is used as the water supply means in the sixth aspect, in addition to the intermittent discharge using the rotating means having the water receiving blades, the intermittent supply is performed. Since the pressurized cleaning water is supplied to the cleaning nozzle, the jet speed of the cleaning water is further increased, and the same cleaning feeling can be obtained with a smaller amount of water.

According to a ninth aspect of the present invention, the nozzle driving means in the sixth aspect is a hydraulic drive type in which the cleaning nozzle is advanced to the position of the portion to be cleaned by water pressure and retracted to the storage position by the elastic member when the water pressure is released. Therefore, a special driving member for moving the cleaning nozzle forward and backward is not required, and simplification of the configuration and cost reduction can be realized.

According to a tenth aspect of the present invention, the nozzle driving means in the sixth aspect comprises a motor and a conversion means for converting a rotational movement of the motor into a linear movement. Instead, it is possible to realize a cleaning mode in which the cleaning nozzle is moved in small increments in the front-rear direction to perform cleaning in a wide range in the front-rear direction, and multi-functionality can be achieved.

[0026]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a sectional view of a sanitary washing device showing an embodiment of the present invention, FIG. 2 is an upper sectional view of a washing nozzle, FIG. 3 is an enlarged top view of a main portion of the washing nozzle, FIG. 4 is an enlarged side sectional view of a main part of the cleaning nozzle. 13 in the figure
Is a water supply means composed of a pump or the like, and 14 is a heating means for heating the washing water, and is an instantaneous heating means for energizing the heater 15 to heat it in a water-passing state only when in use. Numeral 16 is a butt washing nozzle for jetting washing water toward the anus of the human body for washing, and 17 is a bidet washing nozzle for washing the female part. The washing water is a desired washing nozzle 16, 17 by a nozzle switching valve 18. It is configured to be able to selectively discharge from. Here, the nozzle switching valve 18 also has a nozzle selection function and a flow rate adjustment function for the selected cleaning nozzles 16 and 17. A control unit 19 receives signals from the operation unit 20 and controls the water supply unit 13, the heating unit 14, and the nozzle switching valve 18.

2, FIG. 3, and FIG. 4, reference numeral 21 denotes a nozzle cylinder having a water supply port 22 and a valve portion 21a. The nozzle cylinder 21 is advanced into the interior by water pressure, and when the water pressure is released, the elastic member 23 retracts the storage position (see FIG. A movable nozzle body 24 (not shown) is provided, and the seal member 24
a. The movable nozzle body 24 includes a water supply passage 25,
A rotation means 29 that is provided in a nozzle chamber 26 that communicates with the water supply passage 25, has a plurality of water receiving blades 28 around a rotation shaft 27 that is orthogonal to the axis of the hip cleaning nozzle 16, and that rotates by water flow. It has an ejection hole 30 provided at a predetermined position parallel to the rotation shaft 27 of the means 29. The water supply passage 25a in the vicinity of the rotating means 29 is configured to cause a water flow to act on the outer peripheral portion of the water receiving blade 28, and is configured to be smaller than the water supply passage 25 to improve the flow velocity. .
A gap g is formed between the ejection hole 30 and the upper end surface of the rotating means 29.
Is provided. Further, in the vicinity of the ejection hole 30, an air suction port 31 for mixing air into the cleaning water by an ejector effect caused by the ejection of the cleaning water is provided, and a second ejection hole 32 is provided coaxially with the ejection hole 30. Has been.

The bidet washing nozzle 17 is composed of the same member as the hip washing nozzle 16, but the washing nozzle is advanced to a position suitable for the female local position, and the bidet washing nozzle 17 is positioned farther than the ejection hole 30 of the buttocks washing nozzle 16. It is configured to have a large pore size and a relatively soft feeling of washing.

Next, the operation of the present embodiment having the above-mentioned structure will be described.
The operation will be described. When the cleaning request signal is detected by operating the operation unit 20, the water supply unit 13 is operated by the control unit 19 to supply water to the heating unit 14. Heating means 1
In 4, when the water flow detection means (not shown) detects water entry, the heater 15 is energized to instantaneously heat the water. The heated hot water is selectively switched by the nozzle switching valve 18 to the hip cleaning nozzle 16 or the bidet cleaning nozzle 17. When the supplied hot water reaches the inside of the nozzle cylinder 21, water pressure acts on the end surface of the movable nozzle body 24, and the movable nozzle body 24 advances against the force of the elastic member 23 to move the valve portion 21.
The seal member 24a comes into contact with a and stops at the cleaning position.
Next, the cleaning water flows from the water supply passage 25a of the movable nozzle body 24 into the water supply passage 25a and is jetted from the water supply passage 25a to increase the flow velocity, so that the water flow is received by the rotation means 29 provided in the nozzle chamber 26. The rotating means 29 is rotated by acting on the outer peripheral portion of the blade 28. When the rotating means 29 rotates, the ejection hole 3
0 is intermittently closed by the upper end surfaces of the plurality of water receiving blades 28, and the washing water is intermittently ejected from the ejection holes 30 by the chopper action, and a pulsating water flow is obtained. In addition, the amount of water per unit time is reduced by intermittently closing the nozzle holes 26 by intermittently closing the nozzle holes 26 as shown in FIG.
Since the internal pressure (nozzle internal pressure) intermittently rises to Pn1, the ejection speed increases, and a predetermined washing feeling can be obtained with a small amount of water.

Further, by rotating the rotating means 29, an inverted conical jet flow centered on the axis of the jet hole 30 can be obtained. This point will be described in detail with reference to FIG. As shown in FIG. 6A, in the first process until one end surface of the water receiving blade 28 reaches the center of the ejection hole 30, the water flow discharged is in the traveling direction of the water receiving blade 28 as indicated by the arrow. It is deflected in the opposite direction, and as shown in FIG.
In the second process in which the center of the water receiving blade 28 and the center of the water receiving blade 28 are substantially coincident with each other, the ejection holes 30 are in a substantially closed state and the water discharge is limited. Further, as shown in FIG. In the third process, which is far from the center of the jet hole 30, the discharged water flow is deflected in the same direction as the advancing direction of the water receiving blade 28. That is, these processes are continuously repeated by the plurality of water receiving blades 28 to form a reverse conical jet flow centered on the axial center of the jet hole 30, reducing the feeling of concentration and improving comfort during cleaning. It will be improved.

Further, when the cleaning water is ejected from the ejection holes 30, the air is entrained from the air suction port 31 by the ejector action, and as a result, the feeling of flow rate is increased and the cleaning can be performed with a smaller amount of water.

As described above, the same cleaning feeling can be obtained with a smaller amount of cleaning water, so that the heating means 14 can be of the instantaneous type. That is, the current value that can be obtained with a commercial 100v power source is around 12A, and with this current value, the water temperature in winter is 5
The flow rate of water capable of being instantaneously boiled at 40 ° C., which is suitable for cleaning human body parts, is about 0.5 l / min. The hot water storage type requires a maximum wash water amount of 1 l / min or more, and in this embodiment, a washing feeling equivalent to that of the hot water storage type was achieved with a water amount of 0.45 l / min. As a result, hot water will not run out even if it is used continuously, and the hot water storage tank will not be needed, so the overall size of the device can be reduced, and further, energy loss can be saved by preventing loss of electrical energy for keeping hot water. Become.

Further, in this embodiment, since the water is intermittently discharged from the ejection holes 30 at a frequency proportional to the number of the water receiving blades 28 and / or the amount of washing water, the number of the water receiving blades 28 is correspondingly determined when the adjustment range of the water amount is determined. By adjusting the, it is possible to easily and sensibly set a suitable ejection frequency range. The lower the discharge frequency, the easier it is to perceive visually, and the higher the discharge frequency, the closer to a continuous flow. However, when the strong water pressure, that is, the amount of water increases, the number of rotations of the rotating means 29 increases in proportion and the discharge frequency increases. Therefore, the sensation of strong water is relieved. On the contrary, when the water pressure becomes weak, the discharge frequency also decreases, and it becomes easier to perceive it perceptually. Therefore, the amount of water in the weak water can be reduced. As a result, the water pressure adjustment range is expanded. In addition, according to a feeling experiment, the discharge frequency is 1 Hz to 60 Hz, preferably 5
The range of Hz to 20 Hz was suitable.

Here, the number of water receiving blades 28 is preferably 3 to 8, and if the number of water receiving blades is 3 or less, a smooth rotating operation cannot be obtained, and if it is 8 or more, a good rotating operation is realized. However, in this type of sanitary washing device, the ejection frequency becomes too high, and a suitable sensation cannot be obtained.

Further, in this embodiment, the ejection hole 30 and the water receiving blade 28
Since a predetermined gap g is provided between the end faces of the nozzles, even if the rotating means 29 is stopped in a state where it blocks the ejection hole 30 due to foreign matter or the like, the gap g serves as a passage and a predetermined amount from the ejection hole 30. It is possible to prevent the cleaning water from being discharged and becoming unable to be cleaned.

As described above, according to this embodiment, the following effects can be obtained.

(1) Since the jetting hole 30 is provided at a position parallel to the rotating shaft 27 of the rotating means 29 having a plurality of water receiving blades 28, the rotating means 29 is rotated and the water is discharged from the jetting hole 30 by the chopper action. The washing water becomes an intermittent flow and a pulsating water flow is obtained.

(2) Since the amount of water per unit time is reduced and the internal pressure of the nozzle chamber 26 is intermittently increased, the jetting speed is increased and a predetermined washing feeling can be obtained with a small amount of water. This makes it possible to employ the instantaneous heating means 14. As a result, the hot water does not run out even if it is continuously used, and the hot water storage tank is not required, so that the entire apparatus can be downsized, and further, the electric energy loss for keeping the hot water can be prevented to save energy.

(3) As the plurality of water receiving blades 28 rotate, a jet flow of an inverted conical shape centering on the axis of the jet hole 30 is formed, and the feeling of concentration is alleviated and the comfort during washing is improved.

(4) Since the predetermined gap g is provided between the jet holes 30 and the end faces of the water receiving blades 28, even if the rotating means 29 is stopped in a state of blocking the jet holes 30, the gap g will pass through the passage. And a predetermined amount of cleaning water is discharged from the ejection hole 30,
Prevents inability to wash.

(5) Since the air suction port 31 is provided in the vicinity of the ejection hole 30, air is mixed into the cleaning water by the ejector action, the feeling of flow rate is increased and cleaning with a smaller amount of water is possible.

(6) Since the nozzle drive means is hydraulically driven, no special drive member for moving the cleaning nozzles 16 and 17 back and forth is required, and the structure can be simplified and the cost can be reduced.

In the present embodiment, the hydraulic type has been described as the nozzle driving means, but a motor driving type composed of a motor and a converting means for converting the rotational movement into a linear movement (neither is shown) may be used. According to this method, not only the forward / backward movement of the cleaning nozzle but also a cleaning mode in which the cleaning nozzle is moved in small increments in the front-rear direction to perform cleaning in a wide range in the front-rear direction, and the like, can be made multifunctional.

(Embodiment 2) FIG. 7 is a block diagram of a water supply means 13 showing another embodiment of the present invention. The difference from the embodiment shown in FIG. 1 is that a gear 3 rotated by a motor 33 is used.
4, a link 37 that is connected to the gear 34 and is provided in the cylinder 35 to convert a piston 36 into a reciprocating motion, and a check valve 38 form a piston pump capable of intermittently pressurized discharge. Other structures are the same as those of the embodiment shown in FIG. 1 and have the same function and effect, and detailed description thereof will be omitted.

The operation and action of the sanitary washing device constructed as above will be described below. When the motor 33 rotates, the piston 36 is passed through the gear 34 and the link 37.
Is reciprocated, and the wash water is intermittently pressurized and discharged by the check valve 38. That is, as shown in FIG. 8, when the piston 36 advances, it is pressurized and discharged (Pm), and when it retracts, the cylinder 3 is discharged.
Water is absorbed in 5. By making the water supply means 13 capable of intermittently pressurizing and discharging, in addition to intermittently discharging by using the rotating means 29 having the water receiving blades 28 in the cleaning nozzles 16 and 17, the cleaning in the intermittently pressurized state is performed. Water cleaning nozzle 1
Since it is supplied to Nos. 6 and 17, the jet speed of the washing water is further increased, and the same washing feeling can be obtained with a smaller amount of water.

[0047]

As described above, according to the invention described in claims 1 to 10 of the present invention, since the ejection hole is provided at a position parallel to the rotation axis of the rotating means having a plurality of water receiving blades, This is because the rotating means rotates.

The washing water discharged from the jet holes by the chopper action becomes an intermittent flow, and a pulsating water flow is obtained. Also, in the process of blocking one jet with one jet,
The jet flow is deflected by the end surface of the water receiving blade to form an inverted conical jet flow centered on the axial center of the jet hole, which reduces the feeling of concentration and improves comfort during washing. Further, since the amount of water per unit time is reduced and the internal pressure of the nozzle is intermittently increased, the ejection speed is increased, and a predetermined washing feeling can be obtained with a small amount of water. This makes it possible to use a momentary heating means, and even if it is continuously used, the hot water will not run out, and the hot water storage tank will not be needed, so the overall size of the device can be reduced and the hot water storage will be kept warm. Energy loss can be achieved by preventing the loss of electric energy.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a sanitary washing device showing an embodiment of the present invention.

FIG. 2 is an upper sectional view of the cleaning nozzle.

FIG. 3 is an upper sectional view of the tip of the cleaning nozzle.

FIG. 4 is a side sectional view of the tip of the cleaning nozzle.

FIG. 5 is a characteristic diagram showing a relationship between time and nozzle internal pressure in the cleaning nozzle.

FIG. 6 is an enlarged cross-sectional view of the main part of the jet hole and the water receiving wall.

FIG. 7 is a configuration diagram of a water supply means showing another embodiment of the present invention.

FIG. 8 is a characteristic diagram showing the relationship between the same time and pump discharge pressure.

FIG. 9 is a configuration diagram of a conventional sanitary washing device.

[Explanation of symbols] 13 Water supply means 14 Heating means 16, 17 Cleaning nozzle 19 Control unit 25 water supply channels 27 rotation axis 28 Water intake wing 29 rotation means 30 ejection holes 31 Air suction hole

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Shiro Takeshita             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. (72) Inventor Shigeru Shirai             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. (72) Inventor Masaaki Inaki             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. F-term (reference) 2D038 JA06 JB04 JH12

Claims (10)

[Claims] 1. A rotating means having a plurality of water receiving blades, rotating means for rotating by a water flow from a water supply passage, and an ejection hole provided in a position parallel to a rotation axis of the rotating means. The cleaning nozzle is configured to intermittently substantially close the ejection hole by the water receiving wall. 2. The cleaning nozzle according to claim 1, wherein the cleaning nozzle intermittently discharges from the ejection hole at a frequency proportional to the number of water receiving blades and / or the amount of water. 3. The sanitary washing nozzle according to claim 1, wherein the number of water receiving blades is 3 to 8. 4. A predetermined gap g between the jet hole and the end face of the water receiving blade.
The cleaning nozzle according to claim 1, wherein the cleaning nozzle is provided. 5. The cleaning nozzle according to claim 1, wherein an air suction port is provided in the vicinity of the ejection hole. 6. A water supply means for supplying wash water, a heating means for heating the wash water, and a water supply passage communicating with the water supply means, and jetting the wash water toward a human body part. A sanitary washing device comprising the washing nozzle according to any one of items 1 to 3, a nozzle driving unit that drives the washing nozzle to move forward and backward, and a control unit. 7. The sanitary washing device according to claim 6, wherein the heating means is of an instantaneous type in which the heater is energized only when in use. 8. The sanitary washing device according to claim 6, wherein the water supply means is composed of a pump capable of intermittently pressurized water discharge. 9. The hydraulic drive system as set forth in claim 6, wherein the nozzle driving means is a hydraulic drive type in which the cleaning nozzle is advanced to the position of the portion to be cleaned by water pressure and retracted to the storage position by an elastic member when the water pressure is released. The sanitary washing device described. 10. The sanitary washing device according to claim 6, wherein the nozzle driving means is composed of a motor and a conversion means for converting a rotational movement of the motor into a linear movement.