JPH08319653A - Sanitary washing device and control method thereof - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a sanitary washing device having improved performance by being able to supply hot and cold water having an appropriate temperature to a nozzle even when used under severe conditions. [Composition] A sanitary washing device (10) installed in a toilet bowl, which mixes high-temperature hot water heated by a heater (21) with water and jets it locally from a nozzle (60) for washing. When the switch 71 is turned on, hot water is generated in the mixing valve 40 based on the data obtained in advance in the pre-cleaning process, and the data is updated when the hot water temperature data is higher than the maximum temperature data of the previous operation. And the feedforward control unit 85 in the main cleaning process in which hot water for cleaning is jetted.
The mixing valve 40 in cooperation with the temperature of the hot water produced.
Feedback control unit 89 for controlling the temperature of hot water by
A sanitary washing device and a washing method having.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is to wash a local area where a hot water in a hot water storage tank installed in a toilet and heated by a heater is mixed with water by a mixing valve and the temperature is adjusted and jetted locally from a nozzle. And a control method thereof.

[0002]

2. Description of the Related Art It has been proposed to use hot and cold water having a predetermined high temperature discharge temperature, and mix the high temperature hot water and cold water to be supplied separately with a mixing valve so as to obtain a desired temperature and discharge the hot water.

In the case of mixing hot water and water to generate a desired hot water, feedback control (FB) is performed from the beginning when hot water and hot water stored are mixed.
However, since the delay time will occur and the response will be delayed, control to make the preset mixing ratio suitable for reaching the target temperature from the temperature of hot and cold water (FF, feedforward control) Some are used together with.

That is, since the FF control determines the opening degree of the mixing valve depending on the conditions of high temperature hot water, cold water and the target temperature, the FB control has a quick response, and the FB control opens the mixing valve based on the deviation between the mixed hot water temperature and the target temperature. The degree of accuracy is high because it determines the degree, and by using both control methods together, it is possible to obtain hot and cold water at the target temperature quickly and appropriately.

Further, a hot water storage tank for making and storing high temperature hot water is provided, hot water is taken out from the upper part of the hot water storage tank, and cold water is supplied from the bottom of the hot water storage tank without lowering the temperature of the hot water. It is possible to take it out. In the hot water storage tank, a high temperature sensor for detecting the temperature of high-temperature hot water is provided at the tank outlet at the top of the hot water storage tank, in the vicinity thereof, or at the outlet path.

[0006]

However, in the above technique, when cold water is supplied from the bottom into the hot water storage tank,
Hot water and cold water mix inside, so if one user uses a lot of hot and cold water for washing, or if washing is performed repeatedly under severe conditions such as repeated washing, hot and cold water The temperature data detected by the high temperature sensor may fluctuate due to the turbulent flow. Further, due to the flow velocity time delay between the high temperature sensor and the mixing valve, the proper temperature may not be transmitted to the mixing valve. At this time, if the FF control is performed, the temperature data fluctuates, so that the data after the FF calculation also fluctuates, and there is a problem that the mixing valve repeats a fine opening / closing operation and the discharge water temperature becomes unstable. It was

Further, there is a problem that the high temperature sensor detects a turbulent cold water temperature and the FF control causes the mixing valve to open too much to the hot water side, resulting in a high discharge water temperature.

Further, the cleaning operation is carried out by a set of a pre-cleaning for cleaning around the nozzle with a small amount of hot water, a main cleaning for spraying hot and cold water locally on the nozzle, and a post-cleaning similar to the pre-cleaning. Is common. For example, when the water is once discharged, the hot water in the hot water storage tank is almost used up, and the water is again discharged, the temperature of the high-temperature water at the start of water discharge is low, so the FF calculation is performed assuming that the temperature of the hot water remains low even in the main cleaning.

At this time, when the water discharge amount in the pre-wash or the main wash is small, the heat amount supplied by the heater exceeds the heat amount used in the water discharge during the main wash, and the hot water temperature in the hot water storage tank rises. In some cases, if the FF calculation of the main cleaning is performed with the low temperature data in the pre-cleaning at the start of water discharge in the main cleaning as it is, the mixing valve is operated to the high temperature side, so an overshoot may occur to the user. There was a problem that it might make you feel hot.

The present invention has been made by paying attention to the problems of the prior art as described above, and it is possible to supply hot and cold water having an appropriate temperature to the nozzle even when the method is used under severe conditions. Thus, it is an object of the present invention to provide a sanitary washing device having improved performance.

[0011]

The gist of the present invention for achieving the above object resides in the inventions of the following items.

1. A heater (21) installed in a toilet bowl
The high temperature hot water in the hot water storage tank (20) heated by the above is mixed with water by the mixing valve (40), the temperature is adjusted, and the nozzle (60) ejects the hot water locally to wash the sanitary washing device (10). ), When the cleaning operation switch (71) is turned on, first, in the pre-cleaning process in which hot water in the pipe is discharged, the mixing valve (40) based on the data obtained in advance.
A feed-forward control unit (85) that controls the hot water to be generated when the hot water temperature data is higher than the maximum temperature during the previous operation and updates the data when it is low In the main washing process of blowing hot water for
A feedback control unit (89) that cooperates with the feedforward control unit (85) and controls the temperature of the hot water by the mixing valve (40) in relation to the temperature of the generated hot water.
A sanitary washing device (10) comprising:

2. The apparatus according to claim 1, further comprising a device user detecting means, wherein the feedforward control section (85) clears the maximum temperature data when the detecting means detects that the device user is away from the seat. Sanitary washing device.

2 Hot water storage tank (20) installed in the toilet bowl
In the control method of the sanitary washing device (10), the hot operating hot water is mixed with water by the mixing valve (40), the temperature of the hot water is adjusted and the nozzle (60) jets the water locally to wash the local area. When (71) is turned on, there is a pre-cleaning process in which hot water in the pipe is first discharged, and a main cleaning process in which hot water for cleaning is jetted. Hot water is generated based on previously obtained data, and When the hot water temperature data is higher than the maximum temperature in the previous operation, the data is updated, and when it is low, the data is updated, and the feed-forward control for controlling the mixing valve (40) is performed to perform the cleaning. In the main washing process in which hot water is ejected, the mixing valve (4) cooperates with the feedforward control and is associated with the temperature of the hot water produced.
0) The method for controlling the sanitary washing device (10), characterized in that feedback control is performed to control the temperature of the hot water according to 0).

[0015]

The sanitary washing device (10) is used to wash hot water by jetting hot water for washing from the nozzle (60) as needed. Hot water for cleaning ejected from the nozzle (60) is obtained by mixing hot hot water and cold water in the hot water storage tank (20) with the mixing valve (40).

When the cleaning operation switch (71) is turned on, first, the area around the nozzle (60) is cleaned in the pre-cleaning process for discharging hot and cold water in the pipe, and then the main cleaning in which hot water for cleaning is jetted locally is performed. Done.

The feedforward control unit (85) operates in the initial stage of cleaning, and the feedforward control unit (85)
Performs FF calculation of the mixing ratio based on the data obtained in advance, and causes the mixing valve (40) to generate hot water at an appropriate mixing ratio. At this time, when the hot water temperature data of the hot water is higher than the maximum temperature data of the previous operation, the data is updated, and when it is low, the FF calculation is performed without updating.

That is, when the same user needs to rewash and turns on the washing operation switch (71) again, the feedforward control section (85) causes the hot water temperature data of the hot water detected this time. When is higher than the data of the maximum temperature during the previous operation, the data is updated and the FF operation is performed based on the data.

Therefore, when the hot water temperature data detected this time due to the turbulent flow of the incoming water is lower than the maximum temperature data at the previous operation, the data is not updated, so there is no malfunction that causes the mixing valve to open too much on the hot water side. However, since the data is updated when the hot water temperature is high, the high temperature water discharge at the time of the low water discharge amount is eliminated. In this way, since the FF calculation is always performed based only on the high-temperature hot water data, the mixing ratio is not determined so as to increase the high-temperature hot water, and high-temperature hot water is jetted from the nozzle (60). There is no.

The feedback control unit (89) operates in cooperation with the feedforward control unit (85) to take over, and relates to the temperature of the hot water generated in the main cleaning process in which hot water for cleaning is jetted. Determine the mixing ratio by FB control,
The temperature of the hot water is controlled by the mixing valve (40), and hot water of an appropriate temperature is ejected from the nozzle (60).

When the use of the toilet bowl is over and a person is replaced,
The detection means of the user of the apparatus detects the leaving of the seat, and the feedforward control section (85) clears the maximum temperature data.
After that, since the above operation is always performed, the sanitary washing device (10) is appropriately controlled, and the sanitary washing device (10) with good performance is obtained.

When the local cleaning is stopped and the user leaves the toilet seat, the hot water storage tank (20) is often filled with cold water, and when the next user performs the local cleaning. Since the temperature of the hot water is low, the feedforward control unit (85) operates based on the new detected temperature of the hot water, and accurate FF control is performed.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. Each drawing shows an embodiment of the present invention. FIG. 1 is a conceptual diagram of the configuration of the sanitary washing device 10. Sanitary washing device 10
Is a device which is detachably installed in a toilet bowl and sprays hot and cold water for cleaning from a nozzle to a local portion.

The sanitary washing device 10 is provided with an electromagnetic valve 30 for receiving water from the tap water on the upstream side of the hot water storage tank 20, and a mixing valve 40, a flow rate control valve 50 and a nozzle 60 on the downstream side of the hot water storage tank 20. A control unit 70 is provided. The electromagnetic valve 30 and the lower part of the hot water storage tank 20 are connected by a cold water supply pipe 35, the electromagnetic valve 30 and the mixing valve 40 are connected by a bypass cold water pipe 36 branched from the cold water supply pipe 35, and the upper end of the hot water storage tank 20. The mixing valve 40 is connected by the hot water pipe 25, the mixing valve 40 and the flow rate control valve 50 are connected by the hot water pipe 45, and the hot water supply pipe 5 is connected from the flow rate control valve 50 to the nozzle 60.
5 is extended.

The hot water storage tank 20 is equipped with a heater 21, a water drain valve 22 is provided at the lower end, and a high temperature sensor 23 and a float switch 24 are provided at the upper portion. The float switch 24 is for detecting the amount of hot water in the hot water storage tank 20, and has a float 24b loosely fitted to the base body 24a so as to be able to move up and down.
It is switched on and off by raising and lowering b.

The electromagnetic valve 30 is normally in the closed position and opens when the cleaning operation switch 71 provided in the control unit 70 is operated. In addition, bypass cold water pipe 36
A cold water sensor 37 is provided in the middle of the route, and the cold water sensor 4
5, a mixed hot water sensor 46 is provided. Mixing valve 4
0 has a drive motor 41 for adjusting the mixing ratio,
The flow rate adjusting valve 50 is a drive motor 5 for adjusting the flow rate.
1 and the nozzle 60 has a drive motor 61 for projecting and retracting the nozzle 60 during use.

The control unit 70 is mainly composed of a CPU of a microcomputer, and controls the heater 21 so that the hot water in the hot water storage tank 20 does not rise above a predetermined high temperature by obtaining data from the high temperature sensor 23. The monitoring control unit 80, the feedforward control unit (FF control unit) 85 that controls the mixing valve 40 based on previously obtained data, and the mixing valve 40 by feeding back the temperature data of the hot water to be discharged.
And a feedback control unit (FB control unit) 89 for controlling.

The control unit 70 generally comprises the hot water storage tank 20.
A high temperature sensor 23, a float switch 24,
And cold water sensor 3 provided in the bypass cold water pipe 36
7. Further, the mixed hot water sensor 46 provided in the hot and cold water pipe 45
The control data is obtained from the above to control the amount of water supplied to the hot water storage tank 20 and the heating by the heater 21, and the solenoid valve 3
0, the drive motor 41 of the mixing valve 40, the drive motor 51 of the flow rate control valve 50, the drive motor 61 of the nozzle 60,
Further, the solenoid valve 30 is operated by operating the cleaning operation switch 71.
The operation of is controlled according to a predetermined program.

The feed-forward control unit 85 controls the mixing valve 40 based on previously obtained data in a pre-cleaning process in which hot water in the pipe is discharged to clean the area around the nozzle 60 when the cleaning operation switch 71 is turned on. The hot water for cleaning is generated, and when the hot water temperature data of the hot water is higher than the maximum temperature of the previous operation, the data is updated, and when it is low, it is not updated.

The feedback control unit 89 operates so as to take over in cooperation with the feedforward control unit 85 at the beginning in the main cleaning process in which hot water for cleaning is ejected, and the mixing valve is related to the temperature of the generated hot water. 40 controls the temperature of hot water.

Although not shown, the sanitary washing device 10
Is equipped with a device user's detection means, and the feedforward control section 85 clears the maximum temperature data when the detection means detects the device user's leaving the seat. As the detecting means, various means of cultivated land such as detecting the electrostatic capacity of the user, detecting body pressure, and using a proximity switch can be adopted.

Next, the operation will be described. The control unit 70 controls the sanitary washing device 10 so that the sanitary washing device 10 may be used at any time even when the sanitary washing device 10 is properly mounted and the toilet is not used. Then, when the toilet bowl is used, hot water for cleaning is jetted from the nozzle 60 according to the user's need, and it is used for cleaning the local area.

Regardless of whether the toilet bowl is used or not, the monitor control section 80 detects the hot water temperature in the hot water storage tank 20 by the high temperature sensor 23, and energizes or deenergizes the heater 21 as required to turn on the predetermined hot water temperature. Is maintained and the temperature is monitored so as not to exceed a predetermined temperature. The nozzle 60 is retracted, and the sanitary washing device 10 stands by in such a state. Further, when the float switch 24 is not turned on, the hot water storage tank 20 may be empty, so that the heater 21 is not energized in order to prevent empty heating.

When the flush operation switch 71 is pushed using a toilet bowl, if the float switch 24 is on, the solenoid valve 30
The cold water of the tap water flows into the hot water storage tank 20 from the cold water supply pipe 35, and the hot water of the upper layer in the hot water storage tank 20 flows into the mixing valve 40 from the hot water pipe 25. Cold water simultaneously flows into the mixing valve 40 from the bypass cold water pipe 36.

The control unit 70 cooperates the FF control by the feedforward control unit 85 and the FB control by the feedback control unit 89 in consideration of the temperature instruction value of the high temperature sensor 23 and the cold water temperature indicated by the cold water sensor 37. Then, the drive motor 41 is operated, and the hot water and the cold water are mixed at an appropriate mixing ratio by the mixing valve 40, and the hot water having a just right temperature is discharged to the hot water pipe 45. This temperature is the mixed hot water sensor 46.
Is being monitored by.

The flow control valve 50 downstream of the mixing valve 40 determines the amount of hot water discharged from the nozzle 60, and is determined by a setting switch (not shown).
1 is operated to obtain the amount of hot water. Hot water is hot water supply pipe 55
From the nozzle 60 into the nozzle 60, the driving motor 61 ejects hot water from the tip of the nozzle 60 protruding to a proper position to the local portion for cleaning.

When the cleaning operation switch 71 is operated to stop the operation, the solenoid valve 30 is closed and the water is closed, so that the hot water is stopped from being ejected from the nozzle 60, and the drive motor 61 retracts the nozzle 60 to perform sanitary cleaning. The device 10 is in a standby state.

When the mixed hot water sensor 46 detects an abnormal temperature for some reason during use, the solenoid valve 30 or the like stops the outflow of the hot water having the abnormal temperature from the nozzle 60.
If the amount of hot water in the hot water storage tank 20 is low,
Since the float 24b of the float switch 24 is lowered and turned off, the solenoid valve 30 is opened and water is supplied without flowing hot water from the hot water pipe 25 of the hot water storage tank 20.

The cleaning operation will be described in more detail with reference to FIG. When the cleaning operation switch 71 is turned on in step 1, the area around the nozzle 60 is first cleaned in step 2 in the pre-cleaning process of discharging hot water from the pipe. Next, main cleaning is performed by spraying hot water for cleaning locally. The feedforward control unit 85 operates at the initial stage of cleaning, and the feedforward control unit 85 performs FF calculation of the mixing ratio based on the data obtained in advance, and causes the mixing valve 40 to generate hot water at an appropriate mixing ratio. At that time, it is determined whether or not the hot water temperature data of the hot water is higher than the maximum temperature data of the previous operation.
When it is high, the data is updated in step 4, and when it is low, the FF operation is performed in step 5 without updating. Next, in step 6, main cleaning is performed by spraying hot water for cleaning from the nozzle 60 to the local area.

For example, when the same user needs to rewash and turns on the washing operation switch 71 again, the feedforward control section 85 causes the hot water temperature data of the hot water detected this time to indicate the previous operation. When the temperature is higher than the maximum temperature data, the data is updated and FF is updated based on the data.
Calculate.

As described above, when the hot water temperature data of the hot water detected this time is lower than the maximum temperature data of the previous operation, the data is not updated, so that the high temperature sensor 23 is caused by the turbulent flow of water.
Does not erroneously detect, high temperature water is not discharged due to low temperature erroneous detection, and data is updated when the temperature rises, so F
Since the F calculation is performed, the mixing ratio is not determined so as to increase the high-temperature hot water, and the high-temperature hot water does not spout from the nozzle 60.

The user of the apparatus finishes the local cleaning,
The maximum temperature data is cleared when the seating detection means (not shown) detects that the seat is separated from the toilet seat.

In steps 7 and 8, the feedback control unit 89 first operates in cooperation with the feedforward control unit 85 so as to take over, and the temperature of the hot water generated in the main cleaning process in which hot water for cleaning is ejected. In connection with the above, the mixing ratio is determined by FB control, the temperature of the hot water is controlled by the mixing valve 40, and hot water of an appropriate temperature is ejected from the nozzle 60.

FIG. 3 shows a time chart of the operation of the sanitary washing device 10, showing the operation of each part in the pre-washing, main washing and post-washing.

When the use of the toilet bowl is over and a person is replaced,
As described above, the detection means of the apparatus user detects the leaving of the seat, and the feedforward control unit 85 always performs the above operation after clearing the maximum temperature data. Therefore, the sanitary washing apparatus 10 is properly controlled. As a result, the sanitary washing device 10 with good performance is obtained.

Since the sanitary washing device 10 is removable,
When cleaning, you can easily remove it from the toilet bowl to clean the surrounding area. In the correct mounting state, as described above, hot water having a proper temperature is properly ejected from the nozzle 60. When it is not used for a long time or when there is a risk of freezing in cold regions, the water drain valve 22 can be opened to drain the hot water in the hot water storage tank 20 to empty it.

[0047]

According to the sanitary washing device of the present invention,
In the FF control, when the hot water temperature data of the hot water is higher than the maximum temperature data of the previous operation, the data is updated, and when it is low, the data is controlled not to be updated. In this case, hot and cold water at an appropriate temperature can be supplied to the nozzle, and the supply temperature is stable and the sanitary washing device has improved performance.

[Brief description of drawings]

FIG. 1 is a conceptual diagram of a sanitary washing device according to an embodiment of the present invention.

FIG. 2 is a flowchart showing the operation of the sanitary washing device according to one embodiment of the present invention.

FIG. 3 is a time chart showing the operation of the sanitary washing device according to the embodiment of the present invention.

[Explanation of symbols]

 10 ... Sanitary washing device 20 ... Hot water storage tank 21 ... Heater 22 ... Drain valve 23 ... High temperature sensor 24 ... Float switch 25 ... Hot water pipe 30 ... Electromagnetic valve 35 ... Cold water supply pipe 36 ... Bypass cold water pipe 37 ... Cold water sensor 40 ... Mixing valve 41 ... Drive motor 45 ... Hot water pipe 46 ... Mixed hot water sensor 50 ... Flow control valve 51 ... Drive motor 55 ... Hot water supply pipe 60 ... Nozzle 61 ... Drive motor 70 ... Control unit 71 ... Washing operation switch 80 ... Monitoring control unit 85 ... Feedforward control unit 89 ... Feedback control unit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshihisa Haraguchi 2-1, 1-1 Nakajima, Kokurakita-ku, Kitakyushu, Fukuoka Totoki Equipment Co., Ltd. (72) Inventor Shigeru Niki 100 Maeda-cho, Totsuka-ku, Yokohama-shi, Kanagawa Address Koito Industry Co., Ltd. (72) Inventor Toshio Kobayashi 100 Maeda-cho, Totsuka-ku, Yokohama-shi, Kanagawa Koito Industry Co., Ltd. (72) Motoki Moroi 100 Maeda-cho, Totsuka-ku, Yokohama-shi, Kanagawa Koito Industrial Co., Ltd. (72) Inventor Keiichi Sekizawa 100 Maeda-cho, Totsuka-ku, Yokohama-shi, Kanagawa Koito Industry Co., Ltd.

Claims (3)

[Claims] 1. A sanitary cleaning in which hot water in a hot water storage tank installed in a toilet bowl and heated by a heater is mixed with water by a mixing valve, the temperature is adjusted, and the water is jetted locally from a nozzle to wash the local area. In the device, when the washing operation switch is turned on, first, hot water is generated in the mixing valve based on the data obtained in advance in the pre-washing process in which hot water in the pipe is discharged. When the temperature is higher than the maximum temperature of the data, the data is updated, and when it is lower, the data is controlled not to be updated, and in the main cleaning process in which hot water for cleaning is ejected, the feedforward controller cooperates with the data. And a feedback control unit that controls the temperature of the hot water by the mixing valve in relation to the temperature of the generated hot water. 2. The sanitary washing according to claim 1, further comprising a device user detecting means, wherein the feedforward control section clears maximum temperature data when the detecting means detects that the device user is away from the seat. apparatus. 3. A sanitary cleaning in which hot water in a hot water storage tank installed in a toilet bowl and heated by a heater is mixed with water by a mixing valve, temperature is adjusted and jetted locally from a nozzle to wash the local area. The control method of the device has a pre-cleaning process in which hot water in the pipe is first discharged when the cleaning operation switch is turned on, and a main cleaning process in which hot water for cleaning is jetted. When the hot water temperature data of the hot water is higher than the highest temperature data of the previous operation, the data is updated, and when it is low, the feed forward control is performed to control the mixing valve without updating, In the main cleaning process in which hot water for cleaning is jetted, a feedback control that cooperates with the feedforward control and controls the temperature of the hot water by the mixing valve in relation to the temperature of the generated hot water is performed. The method of the sanitary washing device, characterized in that Nau.