JPH0941466A - Sanitary washing device and washing method - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: To maintain washing water at an appropriate temperature and improve washing performance. SOLUTION: At the time of spouting mixed hot water, both the upper limit temperature and the lower limit temperature of the hot water are set to be high, the energization of the heater 21 is started early, and the decrease of the hot water in the hot water storage tank 20 is prevented, thereby mixing the hot water. Improves performance by allowing hot water to be maintained at a suitable temperature.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is designed to mix hot water in a hot water storage tank heated by a heater with water by a mixing valve, adjust the temperature of the hot water, spout the water locally from a nozzle, and wash the local area with the hot water. The present invention relates to a sanitary washing device and a washing method.

[0002]

2. Description of the Related Art It has been proposed to mix hot water in a hot water storage tank with cold water supplied by a mixing valve so as to adjust a wide range of target temperature and spout the mixed hot water. In a case where hot water and cold water are mixed to generate a mixed hot water having a target temperature, for example, a heating heater is provided in the hot water storage tank, and energization of the heating heater is controlled so that the hot water of the hot water storage tank has an upper limit temperature. Then, the energization of the heating heater is stopped, and when the hot water of the hot water storage tank reaches the lower limit temperature, the energization of the heating heater is started and the hot water is kept at a high temperature within a predetermined range.

[0003]

However, in the above technique, for example, after the power supply to the heater is stopped,
When water discharge is started, the heater is not energized until the temperature sensor detects the lower limit temperature, so the cold water taken in from the bottom of the hot water storage tank causes the temperature of the hot water to rise from the bottom to the top of the hot water storage tank. When hot water and cold water which are lowered and mixed are mixed, there is a problem that the time for which the hot water to be spouted can be maintained at an appropriate temperature is shortened. On the other hand, in order to prevent the temperature decrease of the hot water, it is possible to raise the lower limit temperature of the hot water, but if the lower limit temperature of the hot water is raised, the temperature range between the lower limit temperature and the upper limit temperature narrows,
Chattering may occur due to frequent repeated start and stop of energization of the heater. The present invention has been made by paying attention to the problems of the above-described conventional techniques, and sets both the upper limit temperature and the lower limit temperature of hot water to be high at the time of spouting the mixed hot water to accelerate the energization of the heater. It is an object of the present invention to provide a sanitary washing device that has improved performance by starting hot water prevention and maintaining the mixed hot water at an appropriate temperature.

[0004]

The gist of the present invention to achieve the above object lies in the following inventions.

1. Hot water in a hot water storage tank (20) heated by a heater (21) is mixed with water by a mixing valve (40) to adjust the temperature, and water is spouted locally from a nozzle (60). In a sanitary washing device designed to wash
At the time of water discharge of the mixed hot water, both the upper limit temperature value at which the heating heater (21) is de-energized and the lower limit temperature value at which the heating heater (21) is energized are set high, and the temperature of the hot water is controlled to be high. Then, the sanitary washing device is characterized by having a control unit (70) capable of maintaining the mixed hot water to be spouted at an appropriate temperature.

(2) The controller (70) opens the mixing valve (40) to the water side when the temperature of the hot water rises and corrects the temperature of the hot water when the hot water is discharged. The sanitary washing device according to claim 1, characterized in that. 3
Hot water storage tank (20) heated by heater (21)
In the sanitary washing method in which the hot water of (1) is mixed with water by the mixing valve (40), the temperature is adjusted, and the nozzle (60) locally discharges the water, and the local area is washed with the mixed hot water. The upper limit temperature value at which the heating heater (21) is de-energized and the lower limit temperature value at which the heating heater (21) starts energizing are both set high, and the temperature of the hot and cold water is controlled to be high, so that the mixture to be discharged. A sanitary washing method characterized in that hot water can be maintained at an appropriate temperature.

Next, the operation of the invention of each of the above items will be described. At the time of spouting the mixed hot water, the control unit (70) sets both the upper limit temperature value at which the heater (21) is de-energized and the lower limit temperature value at which the heater (21) is energized to be high. As a result, the heater (2
1) enters, and the temperature of the hot water in the hot water storage tank (20) becomes higher than that when no water is discharged. For example, after the power supply to the heater (21) is stopped, water discharge is started, and the cold water taken in from the bottom side of the hot water storage tank (20) lowers the hot water from the lower part to the upper part of the hot water storage tank (20). If it is left as it is, the lowered hot water and cold water are mixed by the time when the energization of the heater (21) is started, and the mixed hot water becomes an unsuitable temperature, but the lower limit temperature of the hot water is set to a high value when spouting water. Therefore, when the water discharge is started, the heating heater (21) is immediately energized, the hot and cold water does not decrease, and the hot and cold water can be mixed and the mixed hot water to be discharged can be maintained at an appropriate temperature. .

Water discharge is started and the heater (2
When energization to 1) is started and the temperature of the hot water rises to reach the upper limit temperature, the energization to the heater (21) is stopped, but the upper limit temperature is also set to a high value, so the energization is stopped immediately. Therefore, chattering can be prevented from occurring. On the other hand, the energization of the heater (21) may start and the temperature of the hot water may become high. In that case, the mixing valve (40) is opened to the cold water side to keep the hot water at an appropriate temperature. be able to.

According to another aspect of the sanitary washing device of the present invention, the control unit (70) controls the mixing valve (40) to open to the water side when the temperature of the hot water rises when the hot water is discharged.
It is possible to correct the mixed hot water to be discharged to an appropriate temperature. In the sanitary washing method according to claim 3, similarly, for example, the water discharge is started after the heating heater (21) is de-energized, and cold water taken in from the bottom side of the hot water storage tank (20) causes the hot water storage tank (20). Although the amount of hot and cold water decreases from the bottom to the upper part of the water, the temperature of the hot and cold water is high during spouting, so there is no significant decrease in the hot and cold water, and hot and cold water is mixed and the mixed hot water to be spouted is heated to the proper temperature. Can be maintained at

[0010]

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. The sanitary washing device 10 is detachably installed in the toilet bowl,
Hot water for cleaning is jetted locally from the nozzle.

The sanitary washing device 10 has a solenoid valve 30 and a pressure reducing valve 31 which receive water from the tap water upstream of the hot water storage tank 20.
And a mixing valve 40, a flow rate control valve 50, and a nozzle 60 are provided on the downstream side of the hot water storage tank 20.
Is provided. The electromagnetic valve 30 and the lower portion of the hot water storage tank 20 are connected by a cold water supply pipe 35, and the electromagnetic valve 30 and the mixing valve 4 are connected.
0 is a bypass cold water pipe 36 branched from the cold water supply pipe 35.
The upper end of the hot water storage tank 20 and the mixing valve 40 are 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 flow rate control valve 50 to the nozzle 60 are connected.
A hot and cold water supply pipe 55 extends. The cleaning includes pre-cleaning for cleaning the nozzle 60, main cleaning for cleaning the local area after the pre-cleaning, and post-cleaning for cleaning the nozzle 60 after the main cleaning.

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 part. 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 solenoid valve 30 is normally in the closed position and opens when the cleaning operation unit 71 provided in the control unit 70 is operated. The bypass cold water pipe 36 is provided with a cold water sensor 37 in the middle of the route, and the hot water pipe 45 is equipped with the mixed hot water sensor 4
6 are provided. The mixing valve 40 has a drive motor 41 for adjusting the mixing ratio, the flow rate adjusting valve 50 has a drive motor 51 for adjusting the flow rate, and a nozzle 60.
Has a drive motor 61 for retracting this during use.

The control unit 70 is mainly composed of a CPU of a microcomputer, and obtains data of the hot water of the hot water storage tank 20 from the high temperature sensor 23 so as not to rise above a predetermined upper limit temperature, and a predetermined temperature. The monitoring control unit 80 that controls the heater 21 so as not to drop below the lower limit temperature, the feedforward control unit (FF control unit) 85 that controls the mixing valve 40 based on previously obtained data, and the hot water to be discharged. Mixing valve 40 by feeding back temperature data
And a feedback control unit (FB control unit) 89 for controlling. As shown in FIGS. 1 and 2, the control unit 7
The FF control unit 85 of 0 operates while the cleaning operation unit 71 is operated and spouts the mixed hot water. When the mixed hot water is spouted, the hot water in the hot water storage tank 20 is programmed by a predetermined program. Taking the lower limit temperature as an example, from t1 (58 ° C) to T1
(62 ° C) and the upper limit temperature of hot and cold water is t2 (6
The temperature is changed from 0 ° C to T2 (64 ° C) to control hot water.

The predetermined program is recorded in the storage unit 92. The storage unit 92 stores the lower limit temperature information (t1,
T1), upper limit temperature information (t2, T2), cleaning operation unit 7
Spouting start operation and spouting stop information regarding 1, and
Target temperature information from the temperature control unit 72 is recorded. The FF control unit 85 of the control unit 70 includes the cleaning operation unit 7
When the water spouting start signal of 1 is output to the control unit 70, the lower limit temperature T1 (62 ° C.) of the hot water in the storage unit 92 is set to the calculation unit 9 described later.
1, and the upper limit temperature T2 (64 ° C.) of hot and cold water is taken into the calculation unit 91 described later. In the calculation unit 91, the data of the high temperature sensor 23 is compared with the lower limit temperature T1, and if the data is lower than the lower limit temperature T1, energization to the heater 21 is started, and the data of the high temperature sensor 23 and the lower limit temperature T2 are compared. If the data is higher than the lower limit temperature T2, the supply current is controlled so as to stop energizing the heater 21.

Further, the FF control unit 85, based on the detection signal of the high temperature sensor 23 when the hot water becomes high, the calculation unit 9
1 controls the valve opening information of the mixing valve 40 and outputs the valve opening information to the drive circuit 93. Also, similar control may be performed when the amount of hot water becomes low. The FB control unit 89 of the control unit 70, when the signals from the mixed hot water sensor 46 provided in the hot water pipe 45 and the temperature adjustment unit 72 are input to the storage unit 92, the calculation unit 91 causes the temperature of the mixed hot water and the target. Controlling the drive motor 41 of the mixing valve 40 by calculating the deviation from the temperature, performing proportional operation, differential operation or integral operation based on the deviation, adding the calculated numerical values and outputting to the drive circuit 93. Is.

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.

As shown in the flow chart of FIG. 3, when the toilet is not used, that is, when the electromagnetic valve 30 is off and closed, the heater 21 is turned on and the heater 21 is energized. For example, the monitoring control unit 80 detects the hot water temperature in the hot water storage tank 20 by the high temperature sensor 23, fetches the data of the high temperature sensor 23 and the upper limit temperature t2 from the storage unit 92 into the calculation unit 91, and the hot water temperature is the upper limit temperature t2. If it is higher, the heating heater 21 is turned off, and the energization to the heating heater 21 is cut off. If the hot water temperature is lower than the upper limit temperature t2, the heating heater 21 is kept on and the energization to the heating heater 21 is continued.

With the solenoid valve 30 turned off,
If the heater 21 is off, the monitoring controller 80
The temperature of the hot water in the hot water storage tank 20 is detected by the high temperature sensor 23, and the data of the high temperature sensor 23 and the lower limit temperature t1 from the storage unit 92 are taken into the calculation unit 91, and the hot water temperature is the lower limit temperature t.
If it is higher than 1, the heating heater 21 is kept off, and the energization to the heating heater 21 is continuously cut off. If the hot water temperature is lower than the lower limit temperature t1, the heating heater 21 is turned on,
Energization of the heater 21 is started. That is, if necessary, the heater 21 is energized or de-energized to maintain a predetermined hot water temperature (t1: 58 to t2: 60 ° C.), and 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. Solenoid valve 3
When 0 is turned on, the lower limit temperature T1 in the storage unit 92 is 58
℃ to 62 ℃, the upper limit temperature T2 is 6
It is set from 0 ° C to 64 ° C. If the heater 21 is turned on when the solenoid valve 30 is turned on, the monitor control unit 80 detects the hot water temperature in the hot water storage tank 20 by the high temperature sensor 23, and the data of the high temperature sensor 23 and the storage unit 92.
When the hot water temperature is higher than the upper limit temperature T2, the heating heater 21 is turned off,
If the hot water temperature is lower than the upper limit temperature T2 when the heating heater 21 is de-energized, the heating heater 21 is kept on and the heating heater 21 is continuously energized. Before the solenoid valve 30 is turned on, the upper limit temperature of hot and cold water is 60 ° C, so the solenoid valve 3
Immediately after 0 is turned on, hot water does not generally become higher than the newly set upper limit temperature of 64 ° C.

With the solenoid valve 30 turned on,
If the heater 21 is off, the monitoring controller 80
The high temperature sensor 23 detects the temperature of the hot water in the hot water storage tank 20, and the data of the high temperature sensor 23 and the lower limit temperature T1 from the storage unit 92 are fetched into the calculation unit 91 to determine the lower limit temperature T.
If it is higher than 1, the heating heater 21 is kept off, and electricity to the heating heater 21 is continuously cut off. If the hot water temperature is lower than the lower limit temperature T1, the heating heater 21 is turned on,
Energization of the heater 21 is started. Since the upper limit temperature of hot water is 60 ° C. before the solenoid valve 30 is turned on, the hot water is always lower than the newly set lower limit temperature 62 ° C. immediately after the solenoid valve 30 is turned on. As shown
When the solenoid valve 30 is turned on, the heater 21 is always turned on and the heater 21 is energized. On the other hand, as shown by a broken line in FIG. 4, in the related art, the solenoid valve 30 is turned on and the heater 21 is turned on after a long time has elapsed. As a result, as shown by the solid line in FIG. 4, in the present invention, the heater 21 is always turned on at the start of the water discharge, and the hot water in the hot water storage tank 20 is used, but there is an additional heating effect. Since the temperature in the tank 20 does not drop sharply, an appropriate temperature of hot water can be maintained for a long time as compared with the conventional case. When the heating heater 21 starts to be energized and the temperature of the hot water rises to reach the upper limit temperature of 64 ° C., the energization is stopped, but there is a temperature difference of 2 ° C. between the lower limit temperature and the upper limit temperature. Takes time,
The energization does not stop immediately and chattering does not occur.

The control unit 70 also considers the temperature instruction value of the high temperature sensor 23 and the cold water temperature indicated by the cold water sensor 37,
The feedforward control unit 85 operates the FF control to operate the drive motor 41, and the mixing valve 40 mixes hot water and cold water at an appropriate mixing ratio, and the hot water pipe 45
The mixed hot water is discharged to. The temperature of the mixed hot water is monitored by the mixed hot water sensor 46. When the heating heater 21 is energized after the start of water discharge and the amount of hot water is high, the feedback control unit 89 causes the drive motor 41 to operate.
Is controlled, the mixing valve 40 opens to the cold water side, and the temperature of the mixed hot water becomes appropriate. The flow rate 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).
To set the amount of hot water. The hot water enters the nozzle 60 from the hot water supply pipe 55, and the drive motor 61 discharges the mixed hot water locally from the tip of the nozzle 60 protruding to a proper position for cleaning.

When the cleaning operation section 71 performs a cleaning start operation, the nozzle 60 is first cleaned, and then the main cleaning is started. In the main cleaning, when the discharge of the mixed hot water is started, the signals from the mixed hot water sensor 46 and the temperature control unit 72 are input to the storage unit 92, and the calculation unit 91 calculates the deviation between the temperature of the mixed hot water and the target temperature. Based on the calculated deviation, PID control by proportional, differential, or integral is performed. Arithmetic unit 9
1, the calculated values are added and output to the drive circuit 93, the drive motor 41 of the mixing valve 40 is driven, and if the temperature of the mixed hot water does not reach the target temperature, the mixing valve 40 It is opened to the hot water side so that the temperature of the mixed hot water approaches the target temperature. When the cleaning operation unit 71 performs a cleaning stop operation, the process proceeds to post-cleaning. When the post-cleaning is completed, the electromagnetic valve 30 is closed and the water is closed, so that the jetting of the mixed hot water from the nozzle 60 is stopped, the nozzle 60 is retracted by the drive motor 61, and the sanitary washing device 10 is in the standby state. Further, when the post-cleaning is completed, the lower limit temperature and the upper limit temperature of the hot water change from T1 to t1, and
To t2.

In the above-described embodiment, the lower limit temperature (62 ° C.) at the time of water discharge is set to be higher by 2 ° C. than the upper limit temperature (60 ° C.) at the time of non-water discharge. It suffices that the energization of the heater 21 is started and the decrease in hot and cold water can be prevented. For example, it is the same as 60 ° C. or 6
Any near temperature higher than 0 ° C may be used. In the examples, t1, T1, t2 and T2 are 58 ° C. and 62, respectively.
Although the temperature was 60 ° C, 60 ° C, and 64 ° C, there is no particular limitation because it is a hot water mixing system. In the sanitary washing device according to the above-described embodiment, the heater 21 is energized intermittently when water is not spouted, and the heater 21 is immediately energized when water is spouted, so that a large amount of power is not required. effective.

[0024]

According to the sanitary washing device of the present invention,
When water is discharged from the hot water mixture, both the upper and lower temperature limits of the hot water are set high, the heater is turned on early to prevent the hot water from falling in the hot water storage tank, and the hot water mixture is maintained at an appropriate temperature. Performance can be improved. Also, in the conventional hot water storage system that discharges hot water from the hot water storage tank as it is, if both the upper limit temperature and the lower limit temperature are set high at the time of water discharge, high temperature water discharge occurs, which is impossible. As a result, there is an effect that it is possible to efficiently continue the appropriate temperature water discharge for a long time.

[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 conceptual diagram showing control of the sanitary washing device according to the embodiment of the present invention.

FIG. 3 is a flowchart of control of the sanitary washing device according to the embodiment of the present invention.

FIG. 4 is a timing diagram of control 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 ... Solenoid valve 31 ... Pressure reducing 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 ... Hot water sensor 47 ... Target temperature setting unit 50 ... Flow rate control valve 51 ... Drive motor 55 ... Hot water supply pipe 60 ... Nozzle 61 ... Drive motor 70 ... Control unit 71 ... Cleaning operation section 72 ... Temperature adjustment section 75 ... Limit sensor 80 ... Monitoring control section 85 ... Feedforward control section 89 ... Feedback control section 91 ... Calculation section 92 ... Storage section 93 ... Drive circuit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kyohiro Yanagawa 2-1-1 Nakajima, Kokurakita-ku, Kitakyushu, Fukuoka Prefecture Totoki Kikai Co., Ltd. (72) Inventor Shigeru Niki Maeda-cho, Totsuka-ku, Yokohama-shi, Kanagawa 100 Address Koito Industry Co., Ltd. (72) Inventor Motoki Moroi 100 Maeda-cho, Totsuka-ku, Yokohama, Kanagawa Prefecture Koito Industry Co., Ltd. (72) Eiji Nomoto 100 Maeda-cho, Totsuka-ku, Yokohama, Kanagawa Prefecture Small Inside Thread Industry Co., Ltd.

Claims (3)

[Claims] 1. A sanitary washing device in which hot water in a hot water storage tank heated by a heater is mixed with water by a mixing valve, temperature is adjusted, water is locally discharged from a nozzle, and the local area is washed with the mixed hot water, At the time of water discharge of the mixed hot water, both the upper limit temperature value for stopping energization to the heating heater and the lower limit temperature value for starting energization to the heating heater are set to be high, and the temperature of the hot water is controlled to be high. A sanitary washing device having a control unit capable of maintaining the mixed hot water to be spouted at an appropriate temperature. 2. The control unit opens the mixing valve to the water side when the temperature of the hot water rises during spouting of the mixed hot water,
The sanitary washing device according to claim 1, wherein the temperature of the mixed hot water is corrected. 3. A sanitary washing method in which hot water in a hot water storage tank heated by a heater is mixed with water by a mixing valve, temperature is adjusted, water is locally discharged from a nozzle, and the local area is washed with the mixed water. At the time of water discharge of the mixed hot water, both the upper limit temperature value for stopping energization to the heating heater and the lower limit temperature value for starting energization to the heating heater are set to be high, and the temperature of the hot water is controlled to be high. A sanitary washing method characterized in that the mixed hot water to be discharged can be maintained at an appropriate temperature.