JPH05296559A - Controller for electric hot water generator for bath - Google Patents

Abstract

PURPOSE:To automatically complete hot water filling in a bathtub at a reserved time. CONSTITUTION:A warm up time measured by timer means 5 is compared with a previous warm up time stored in memory means 3 only when a warm up times deciding means 10 makes a decision of warm up other than first or second time, and if a difference exists therebetween, a time obtained by correcting the previous predetermined warm up time is updated as a predetermined warm up time, and stored in the means 3. The means 3 does not update the predetermined warm up time if the means 10 decides a first warm up time, stores the warm up time measured by the means 5 as a predetermined warm up time as it is when the means 10 makes a decision of a second warm up time, and starts an operation by going back by a time obtained by adding a predetermined time to the predetermined warm up time stored in the means 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a controller for a bath electric water heater that automatically completes filling a bathtub at a reserved time.

[0002]

2. Description of the Related Art In recent years, a bath electric water heater using a heater as a heat source has a function of automatically filling and maintaining heat in a bathtub, and a function of having a reservation timer function to complete filling water at a reserved time. What is needed is requested.

Conventionally, there has been a control device for such a bath electric water heater as shown in FIGS. 4 and 5.
As shown in the figure, the operation starting means 1 is a reserved time setting means 2
The reservation time set in step 3 and the required boiling time stored in the storage means 3 are input, and the automatic bath control means 4 is entered.
And output to the timer means 5. The boiling detection means 6 detects that the thermistor 7 has reached the set temperature, and outputs a boiling signal to the timer means 5. Timer means 5
Starts a timer when a signal is input from the operation starting means 1 and inputs a boiling signal from the boiling detection means 6 to stop the timer means 5. The boiling time (T2) measured by the timer means 5 is output to the storage means 3. The residual water determination means 8 is a water level sensor 9 when the operation is started.
Detects the water level and outputs a storage prohibition signal to the storage means 3 when it judges that there is residual water in the bathtub (not shown). When the storage prohibition signal is not input from the residual water determination means 8, the boiling time (T
2) is stored in the storage means 3 as the required boiling time.

Next, the operation will be described with reference to FIG. When the reservation setting is started, first, in step 1, it is judged whether or not it is the time when the required boiling time goes back from the set time of the reservation, and if the current time is the time when the required boiling time goes back from the set time of the reservation, In step 2, the timer of the timer means 5 for starting the operation is started. If the residual water determination means 8 determines in step 3 that there is no residual water, the process proceeds to step 4, waits until the boiling detection means 6 detects boiling, and if boiling is detected, the timer means 5 in step 5 Stop the timer. The timer value at this time is the boiling time (T2).
In step 6, the boiling time (T
2) is updated as the required boiling time and stored in the storage means 3. If it is determined in step 3 that there is residual water, the required boiling time in the storage means 3 is not updated and the process ends. That is, when there is no residual water in the bathtub, the previous boiling time (T2) is stored, and the operation is started at a time earlier than the reserved set time by the boiling time (T2).

[0005]

However, according to the above-mentioned conventional configuration, 2 is set based on the first boiling time (T2).
Since the start time of the first operation is determined, when the installation work of the bath electric water heater is completed and the first operation is started in the trial operation, the hot water in the hot water tank is not sufficiently boiled, so the boiling time May take a long time. After such a situation, when the hot water of the bath electric water heater is boiled and the second operation is reserved, a very long time as the required boiling time is stored in the storage means 3, so the reserved time setting means 2
From the reservation time set in, the previous required boiling time (T
2) The operation will start at an earlier time. Since the first boiling time was very long, the operation start time will be earlier, but this time the boiling time (T
Since 2) is short, it will boil up earlier than the reserved time, and the heat dissipation loss will increase. If there is no remaining hot water, the operation is started based on the previous boiling time, but if the water level for filling is set extremely lower than normal during the previous operation, the boiling time (T2) will also be increased. It gets shorter. Therefore, next time when the reserved water level is returned to the normal water level and the reserved operation is performed, the boiling time (T2) from the reserved setting time
There was a problem that the hot water did not boil even at the reserved time because it started driving back only.

Further, when the boiling time (T2) is increased by using hot water before the completion of boiling in the previous operation, the boiling time (T2) which has become longer than the reservation set time at the next reserved operation is used. Since the operation is started retroactively, there was also a problem that it boils at an early time and the heat radiation loss thereafter increases.

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a control device for a bath electric water heater which is capable of automatically filling water at a reserved time with a simple structure.

[0008]

In order to achieve the above object, the present invention has a boiling number determining means for determining the number of boiling times, and the boiling number determining means is not the first or second boiling. Only when it is determined that the boiling time measured by the timer means and the previous required boiling time stored in the storage means are compared, and when a difference occurs, the previous required boiling time is corrected. A correction unit that updates the time as the required boiling time and stores it in the storage unit is provided, and the storage unit updates the required boiling time when the boiling number determination unit determines that it is the first boiling time. If the boiling number determination means determines that it is the second boiling, the boiling time measured by the timer means is stored as it is as the required boiling time. One in which has a configuration that.

[0009]

In the above construction, the boiling time measured by the timer means and the previous required boiling time stored in the storage means only when the boiling number determination means determines that it is not the first or second boiling. When the difference is generated by comparing with the boiling time, the time obtained by adding the correction to the previous required boiling time is updated as the required boiling time, and the correction means stores it in the storage means. Even if it takes a very long time, the storage means stores the standard time as the required boiling time as an initial value, so that it does not boil at a very early time with respect to the reserved time.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

In the present embodiment, the same components as those shown in the above-mentioned conventional example are designated by the same reference numerals, and the description thereof will be omitted. The characteristic configuration of the present embodiment is that the controller described in the conventional example is provided with the boiling number determination means 10 and the correction means 11. That is, the boiling time (T1) measured by the timer means 5 is output to the boiling frequency determination means 10, and when the boiling frequency determination means 10 determines the first boiling, the timer means 5 measures it. The generated boiling time (T1) is not output to the correction means 11 and the storage means 3. Also, the boiling frequency determination means 1
When 0 is the second boiling, the boiling time (T1) measured by the timer means 5 is output to the storage means 3 and 1
If it is neither the second boiling nor the second boiling, the boiling time (T1) is output to the correction means 11. When the water level sensor 9 detects the water level when the operation is started, the residual water determination means 8 determines that there is residual water and outputs a correction prohibition signal to the correction means 11. When the correction prohibiting signal is not inputted from the residual water judging means 8, the correcting means 11 requires the required boiling time stored in the storage means 3 and the timer means 5.
The boiling time (T1) measured in step 3 is compared, the required boiling time is corrected, and the corrected boiling time is output to the storage means 3.

FIG. 2 shows a system configuration diagram of the bath electric water heater of the embodiment. That is, the piping from the water supply source is the pressure reducing valve 1
2 is connected to a hot water storage tank 13 and a water valve 14 via
The discharge side of 3 is connected to a general hot water supply pipe 15 and a hot water valve 16. The outlet of the water valve 14 and the outlet of the hot water valve 16 are connected to each other, and a pouring electromagnetic valve 17, a first check valve 18, a vacuum valve 19, a second check valve 20, a thermistor 21, a heater 2 are provided.
2. It is connected to a bathtub 24 through a bathing pipe 23. The bath return pipe 25 connected to the bathtub 24 is connected to the second check valve 2 via the water level sensor 9, the pump 26, and the two-way valve 27.
It is connected between 0 and the thermistor 21. The pouring solenoid valve 17, the heater 22, the pump 26, etc. are the automatic bath control means 4
Controlled by. When the operation is started, the pouring electromagnetic valve 17 is opened, and the hot water mixed by the water valve 14 and the hot water valve 16 is poured into the bathtub 24. Two-way valve 2 at this time
7 is closed, and the pressure of the hot water in the bathtub 24 is detected by the water level sensor 9 through the bath return pipe 25. When the water level sensor 9 detects the set water level, the pouring electromagnetic valve 17 is closed, the two-way valve 27 is opened, the pump 26 is driven, the water in the bathtub 24 is circulated, and the water is heated by the heater 22. When it detects that the thermistor 21 has reached the set temperature, the heater 22 and the pump 26 are de-energized and the two-way valve 27 is closed to complete the boiling.

Next, the operation will be described with reference to FIG. That is, when the reservation setting starts, step 1
At 0, it is determined whether or not the current time is a time retroactive to the required boiling time plus a predetermined time (T0) from the reservation time. When the current time is a time retroactive to the required boiling time plus a predetermined time (T0) from the preset time, the automatic bath operation is started in step 11. At this time, the timer of the timer means 5 is started. When the residual water determination means 8 determines in step 12 that there is no residual water, the process proceeds to step 13 and waits until the boiling detection means 6 detects boiling, and if boiling is detected,
In step 14, the timer of the timer means 5 is stopped. The value of the timer at this time is the boiling time (T1). The boiling time (T1) is data in minutes, and the data of seconds or less is truncated. In step 15, the boiling number determination means 10 determines whether it is the first boiling, and when it determines that it is the first boiling, the operation proceeds to the end and the required boiling time is not updated. .. Therefore, the required boiling time remains the initial value. When it is determined in step 15 that the boiling-up determination means 10 is not the first boiling-up, the process proceeds to step 16. In step 16, the boiling number determination means 10 determines whether it is the second boiling, and if it is the second boiling, the process proceeds to step 17. In step 17, the boiling time (T1) is stored in the storage means 3 as the required boiling time. If it is not the second boiling, the process proceeds to step 18, the boiling time (T1) obtained in step 14 is compared with the required boiling time stored in the storage means 3, and the boiling time (T1) is required. If it is longer than the raising time, the process proceeds to step 19. In step 19, the required boiling time is lengthened by 1 minute and stored in the storage means 3 as a new required boiling time. If the boiling time (T1) is not longer than the required boiling time in step 18,
Proceeding to step 20, the boiling time (T1) obtained in step 14 is compared with the required boiling time stored in the storage means 3, and if the boiling time (T1) is smaller than the required boiling time, then proceed to step 21. move on. In step 21, the required boiling time is shortened by 1 minute and stored in the storage means 3 as a new required boiling time. If the boiling time (T1) is not shorter than the required boiling time in step 20, the required boiling time in the storage means 3 is not updated and the process ends. Also, when the residual water determination means 8 determines in step 12 that there is residual water in the bathtub 24, the process ends without updating the required boiling time of the storage means 3.

Next, an example of an actual reserved operation will be described based on (Table 1).

[0015]

[Table 1]

That is, the initial value of the required boiling time is 2
0 minutes, the predetermined time (T0) is 3 minutes, and the reservation time is 1
An example of the reservation operation at 9 o'clock is shown. In this example, the normal boiling time is 15 minutes, and since the first operation is a test operation after the installation work, the hot water in the hot water storage tank 13 is not sufficiently boiled and requires 30 minutes. At the time of the 7th operation, the water level was extremely lowered and the water was poured, so it boiled in 10 minutes. At the time of the 9th operation, the water was used while filling the water, so it took 18 minutes to boil. It takes time. Further, since the data of 20 minutes is stored in the storage means 3 as the initial value of the required boiling time at the time of the first operation, if the first operation is reserved, the operation start means 1 will be the automatic bath control means. The time when the operation start is output to 4 goes back 20 minutes from the reservation set time of 19:00 and further goes back to the predetermined time (T0) 3 minutes (18:37).
Minutes). However, the first operation is usually a trial operation, so no reservation is made. Although the boiling time at this time is 30 minutes, the required boiling time stored in the storage means 3 is not updated because the boiling number determination means 10 determines that it is the first boiling time. If the second operation is reserved, the time at which the operation start means 1 outputs the operation start to the automatic bath control means 4 goes back 20 minutes from the reserved set time 19:00 as in the case of the first time, and a predetermined time (T0). The time goes back 3 minutes (18:37). At this time, since the hot water in the hot water storage tank 13 is boiling, the boiling time (T1) is 15 minutes. At the time of boiling, the boiling number determination means 10 determines that it is the second boiling, so the boiling time (T1) 15 minutes measured by the timer means 5 is stored in the storage means 3 as it is.
The operation start time for the third time can be traced back from the reserved set time 19:00 to the required boiling time of 15 minutes and then to a predetermined time (T
0) It is 18:42, which goes back 3 minutes. Since the boiling time (T1) from the third time to the sixth time is also 15 minutes, the required boiling time 15 stored in the storage means 3 is 15 minutes.
The correction means 11 does not update the required boiling time, which is equal to the minute. During the reserved operation from the third time to the sixth time, the required boiling time is equal to the normal boiling time (T1).
Since the data of minutes is stored in the storage means 3, the operation start time is 18:42 and the boiling time is 1
It is 8:57. This is a margin time of 3 minutes with respect to the reserved set time, and the heat radiation loss after boiling is also small. Further, during the 7th reserved operation, the boiling water level was extremely lowered, so that the boiling time (T1) was 10 minutes. However, since the correction means 11 shortens the required boiling time by 1 minute to 14 minutes and stores it in the storage means 3, at the time of the eighth reserved operation, the required boiling time is set to 14 minutes and the operation is performed at 18:43. Start. Since the boiling time (T1) at this time is 15 minutes, the boiling time is 1
It will be 8:58. Therefore, the previous boiling time (T
Even though 1) was extremely short at 10 minutes compared to the usual 15 minutes, the boiling this time was reserved time 19
It can be boiled 2 minutes before time. During the 9th reserved operation, the user used hot water while filling water,
The boiling time (T1) is 18 minutes. The boiling time this time is 3 minutes longer than the normal boiling time, so the boiling time is 19:00.
Since the predetermined time (T0) is set to 3 minutes, it is boiling at the reservation set time. Since the correction means 11 increases the required boiling time by 1 minute to 16 minutes and stores it in the storage means 3, 1
At the time of the 0th reserved operation, the required boiling time is 16 minutes and the operation is started at 18:41. Since the boiling time (T1) at this time is 15 minutes, the boiling time is 18:56. Therefore, although the previous boiling time (T1) was 18 minutes longer than the normal 15 minutes, this time, the boiling time is 1 minute earlier.

As described above, according to the controller for the bath electric water heater of the embodiment, when the boiling number determining means 10 determines that the boiling is the first boiling, the required boiling stored in the storage means 3 is reached. 2 without updating the initial value of the raising time
When the boiling time is determined to be the second boiling time, the boiling time is stored as it is in the storage means 3 as the required boiling time. Therefore, even if the first operation is a trial operation and the boiling time is much longer than the normal boiling time, the boiling time is ignored and the required boiling time is not updated. Even if the driving is reserved, the starting time of the driving is prevented from becoming very early and the heat radiation loss is prevented from increasing. Further, if the operation is reserved for the third boiling, the operation is started based on the actual boiling time data, so that the heat radiation loss after the boiling can be reduced. In addition, at the time of the third and subsequent boiling, the correction means 11 compares the boiling time measured by the timer means 5 with the required boiling time stored in the storage means 3,
The required boiling time stored in the storage means 3 is corrected only for 1 minute per boiling. Further, the operation starting means 1
Starts the operation by going back from the preset set time to the required boiling time stored in the storage means 3 and a predetermined time, so that even in the next reserved operation of extremely short boiling, it is possible to boil at the preset time. In addition, even in the next reserved operation after long boiling, it is possible to minimize the increase in heat loss due to boiling at an early time. Further, the required boiling time is corrected by the correction means 11 every time the operation is performed.
Since it is corrected by, it is possible to respond to changes in the boiling time when the water temperature changes or when the water temperature changes. Further, in the embodiment, the predetermined time is set to 3 minutes, but it may be longer than the time (1 minute in this embodiment) corrected by the correction means 11. That is, even if the required boiling time changes once, a predetermined time longer than the time corrected by the correction unit 11 is required to boil at the preset time.
If the boiling time varies greatly, the predetermined time is lengthened. However, if the predetermined time is too long, even if the fluctuation of the required boiling time can be dealt with, the heat radiation loss after boiling will be large.

In the present embodiment, the time (minimum time) corrected by the correction means 11 is set to 1 minute, but if it is a fixed time from 1 second to 10 minutes depending on the length of the normal boiling time. Good.

In the present embodiment, the time (minimum time) for correction by the correction means 11 is addition or subtraction of a fixed time of 1 minute, but it is a fixed multiplication factor of the required boiling time stored in the storage means 3. May be For example, when the required boiling time is lengthened, the required boiling time is multiplied by 1.1 and stored in the storage means 3, and when the required boiling time is shortened, the required boiling time is multiplied by 0.9 and the storage means 3 is stored. May be stored in.

In the example of (Table 1), the reserved operation is performed every time, but when the operation is started by the operation switch instead of the reserved operation, the boiling time is measured as in the reserved operation, The required boiling time can be corrected by the correction means 11.

The operation starting means 1, the reserved time setting means 2, the storage means 3, the timer means 5, the boiling detection means 6, the correction means 11, the residual water determination means 8, and the boiling frequency determination means 10 are one-chip microcomputers. It goes without saying that it can be configured with.

The heater 22 for keeping the heat is 1 k
Since there is only about 5kW of heat flow from W, for example, 2kW
In case of the heater, it takes about 8 minutes to raise the temperature of 200 L of bath water by 1K. Therefore, in order to raise the temperature of 200 L of bath water from 20 ° C to 40 ° C, approximately 160
Since it requires a minute, it is not necessary to re-boil the remaining hot water of the previous day and use it like a gas water heater. In such a case, the remaining hot water is partially drained, and hot water is used as boiling water. Therefore, the residual water determination means 8 determines that there is residual water only in the following situations. That is, when the previous bather stops the operation of the bath electric water heater because the interval between the next bather is long, and then the next bather restarts the operation, the boiling time (T
Since 1) does not serve as a reference for the required boiling time, the required boiling time is not corrected as described in the explanation of the operation flowchart of FIG.

[0023]

As is apparent from the above-described embodiments, the controller for a bath electric water heater according to the present invention has a boiling number determining means for determining the number of boiling times, and this boiling number determining means is the first or second time. Only when it is determined that it is not the second boiling time, compare the boiling time measured by the timer means with the previous required boiling time stored in the storage means, and if a difference occurs, the previous required boiling time Update the corrected time to the required boiling time,
A correction means for storing in the storage means is provided, and the storage means does not update the required boiling time when the boiling number determination means determines the first boiling, and the boiling number determination means 2 When it is determined that it is the second boiling, the boiling time measured by the timer means is stored as it is as the required boiling time, and with this configuration, the reserved operation for extremely short boiling is performed. However, it is possible to boil at the reserved set time, do not boil at an early time even in the next reserved operation after a long boiling, it is possible to reduce the heat dissipation loss after boiling, and each time you drive Since the required boiling time is corrected, it can be changed practically depending on the season, such as changing the set temperature of the water filling or changing the boiling temperature when the water temperature changes. The value is remarkable.

[Brief description of drawings]

FIG. 1 is a block diagram of a controller for a bath electric water heater according to an embodiment of the present invention.

[Fig. 2] System configuration of the bath electric water heater

FIG. 3 is an operation flowchart regarding reservation of a control device for the bath electric water heater.

FIG. 4 is a block diagram of a conventional automatic bath electric water heater controller.

FIG. 5 is an operation flowchart regarding reservation of the control device.

[Explanation of symbols]

 1 Operation Start Means 2 Reserved Time Setting Means 3 Storage Means 4 Automatic Bath Control Means 5 Timer Means 6 Boiling Detection Means 7 Thermistors 8 Remaining Water Judging Means 9 Water Level Sensors 10 Boiling Frequency Judging Means 11 Correction Means 24 Bathtubs

Claims (1)

[Claims] 1. A reserved time setting means for setting a reserved boiling time, a water level sensor for detecting a water level in a bathtub, a boiling detection means for detecting a temperature of a thermistor and a boiling of a bath, and an operation. Storage means for storing the required boiling time from start to boiling, timer means for measuring the time from the start of operation until the boiling detection means detects boiling, and the water level sensor in the bath at the start of operation A residual water determination means for outputting a signal when it is detected that there is residual water, an automatic bath control means for outputting a drive signal, and an operation start means for outputting operation to the automatic bath control means to start operation. The boiling number determining means for determining the number of boiling times and the above-mentioned boiling number determining means are provided only when the boiling number determining means determines that it is not the first or second boiling. The boiling time measured by the timer means and the previous required boiling time stored in the storage means are compared, and when a difference occurs, the required boiling time is the time obtained by adding a correction to the previous required boiling time. A correction means for updating as the boiling time and storing it in the storage means is provided, and the storage means does not update the required boiling time when the boiling number determination means determines that it is the first boiling time. A controller for a bath electric water heater configured to store the boiling time measured by the timer as the required boiling time as it is when the boiling number determination means determines that it is the second boiling.