JPH05296558A - Controller for electric hot water generator for bath - Google Patents

Abstract

PURPOSE:To automate hot water filling at a reserved time by providing means for deciding first warm up time, and means for comparing a warm up time set in a timer means with a predetermined warm up time stored in a memory means only when a decision of warm up other than first time is made. CONSTITUTION:A warm up time measured by timer means 5 is output to first time warm up deciding means 10. As a result, if first time warm up is decided, a warm up time of the means 5 is output to memory means 3. On the other hand, in case of warm up other than first time, the warm up time is output to correcting means 11. Residual water deciding means 8 decides presence of residual water if a water level sensor 9 detects a water level at the time of starting an operation, and outputs a correction inhibit signal to the means 11. The means 11 compares a predetermined warm up time of the means 3 with that of the means 5 if the means 8 does not output the inhibit signal, corrects the predetermined warm up time and outputs it to 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, in the above-described conventional configuration, when there is no remaining hot water, the operation is started based on the previous boiling time. When it is set low, the boiling time (T2) also becomes short. Therefore, next time when the reserved water level is returned to the normal water level and the reserved operation is performed, the operation starts backward from the reserved set time by the boiling time (T2), so that the hot water does not boil even at the reserved time. was there.

Further, if the boiling time (T2) is increased by using hot water before the completion of boiling in the previous operation, the boiling time (T2) that has become longer than the reserved set time at the next reserved operation will be 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 provides a first boiling-up determination means for determining whether it is the first boiling-up, and this first boiling-up determination means is the first boiling-up determination means. Only when it is judged that it is not boiling, compare the boiling time measured by the timer means with the previous required boiling time stored in the storage means, and if there is a difference, correct it to the previous required boiling time Is added as a required boiling time, and a correction means for storing the updated boiling time in the storage means is provided. The storage means uses the timer means when the first boiling determination means determines the first boiling. The measured boiling time is stored as it is as the required boiling time.

[0009]

In the above construction, when the first boiling-up determination means determines that it is the first boiling, the boiling time is stored as it is in the storage means as the required boiling time. When a reservation for the automatic bath operation is made, the operation is started from the reserved time set by the reserved time setting means by a predetermined time added to the required boiling time stored in the storage means. Further, at the second and subsequent boiling times, the correction means compares the boiling time measured by the timer means with the required boiling time stored in the storage means, and the required boiling time stored in the storage means is the minimum time. to correct. Furthermore, since the operation start means starts the operation by tracing back the required boiling time and the predetermined time stored in the storage means from the preset set time, even if the next reserved operation with extremely short boiling is boiled at the reserved set time. In addition, even in the case of a reserved driving after a long boiling, the boiling does not occur very early in time with respect to the reserved time. Therefore, heat dissipation loss after boiling can be reduced.

[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 control unit described in the conventional example is provided with the first boiling-up determination means 10 and the correction means 11. That is, the boiling time (T1) measured by the timer means 5 is output to the first boiling-up determination means 10, and the first boiling-up determination means 10 is output.
When it is determined that the first boiling has occurred, the boiling time (T1) measured by the timer means 5 is output to the storage means 3. If it is not the first boiling, the boiling time (T1) is output to the correction means 11. Residual water determination means 8
When the water level sensor 9 detects the water level at the time of starting operation, it judges that there is residual water and outputs a correction prohibition signal to the correction means 11. The correction means 11 compares the required boiling time stored in the storage means 3 with the boiling time (T1) measured by the timer means 5 when the correction prohibition signal is not input from the residual water determination means 8. , The required boiling time is corrected and 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 is started, it is determined in step 10 whether the current time is a time backward from the preset time of the reservation by adding a predetermined time (T0) to the required boiling 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. Step 1
If the residual water determination means 8 determines in step 2 that there is no residual water, the process proceeds to step 13, waits until the boiling detection means 6 detects boiling, and if boiling is detected, the timer means 5 of the timer means 5 is determined in step 14. Stop the timer. 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 first time determination means 10 determines whether or not it is the first boiling, and when it is determined that it is the first boiling, the process proceeds to step 16 and the required boiling time (T1) is raised. The time is stored in the storage means 3. In Step 17, Step 14
The boiling time (T1) obtained in step 1 is compared with the required boiling time stored in the storage means 3, and the boiling time (T1)
Is larger than the required boiling time, the process proceeds to step 18. In step 18, 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 17, the process proceeds to step 19, and the boiling time (T1) obtained in step 14 is compared with the required boiling time stored in the storage means 3. And boiling time (T
If 1) is shorter than the required boiling time, the process proceeds to step 20. In step 20, 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 smaller than the required boiling time in step 19, the required boiling time of 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 the water level is extremely low during the 7th operation, so boiling is completed in 10 minutes. While using hot water, it took 18 minutes to boil.
Further, since the data of 20 minutes is stored in the storage means 3 as the initial value of the required boiling time during the first reserved operation, the time when the operation start means 1 outputs the operation start to the automatic bath control means 4 is The time (18:37) goes back 20 minutes from the reserved time 19:00 and further goes back 3 minutes by a predetermined time (T0). 1 when boiling
Since there is the second boiling, the boiling time (T1) of 15 minutes measured by the timer means 5 is stored in the storage means 3 as it is. The operation start time of the second time is 18:42, which is traced back from the reserved set time 19:00 to the required boiling time of 15 minutes and further to the predetermined time (T0) of 3 minutes. Two
Since the boiling time (T1) from the sixth time to the sixth time is also 15 minutes, it is equal to the required boiling time of 15 minutes stored in the storage means 3, and the correction means 11 does not update the required boiling time. During the second to sixth reserved driving,
Since the required boiling time is 15 minutes, which is equal to the normal boiling time (T1), is stored in the storage means 3, the operation start time is 18:42 and the boiling time is 18:57. Become. 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 8th reserved operation, the required boiling time is 14 minutes and the operation is started at 18:43. Since the boiling time (T1) at this time is 15 minutes, the boiling time is 18:58. Therefore, even though the previous boiling time (T1) was extremely short, 10 minutes compared to the usual 15 minutes, this boiling should be done 2 minutes before the reserved time 19:00. You can During the ninth reserved operation, the user used hot water while filling water, so the boiling time (T1) was 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 stores the required boiling time in the storage means 3 by increasing the required boiling time by 1 minute to 16 minutes, the required boiling time is set to 1 during the 10th reserved operation.
The operation will start at 18:41 as 6 minutes. 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 first boiling-up determination means 10 determines that the first boiling-up is performed, the required data stored in the storage means 3 is stored. Without updating the initial value of boiling time,
When the boiling time is determined to be the first boiling time, the boiling time is stored as it is in the storage means 3 as the required boiling time.
Therefore, if you book the driving for the second boiling,
Since the operation is started based on the actual boiling time data, the heat radiation loss after boiling can be reduced. Further, at the second and subsequent boiling times, 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, and compares the required boiling time stored in the storage means 3 with each other. Correct only 1 minute per boiling. In addition, since the operation starting means 1 starts the operation by tracing back the required boiling time and the predetermined time (T0) stored in the storage means 3 from the reserved set time, even in the next reserved operation of extremely short boiling, It is possible to boil up at the reserved set time, and it is possible to minimize the increase in heat dissipation loss due to boiling up at an early time even in the next reserved operation after long boiling. Further, the required boiling time is corrected by the correction means 11 each 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.

In the embodiment, the predetermined time (T0) is set to 3 minutes, but the time to be corrected by the correction means 11 (1 in this embodiment).
Minutes). That is, even if there is a change in the required boiling time once, in order to boil at the reserved set time, a predetermined time (T
0) is required. Further, when the fluctuation of the boiling time is large, the predetermined time (T0) is lengthened. However, if the predetermined time (T0) is too long, the heat dissipation loss after boiling becomes large even if the fluctuation of the required boiling time can be dealt with. Further, the time (minimum time) corrected by the correction means 11 is set to 1 minute, but it may be a fixed time from 1 second to 10 minutes depending on the length of the normal boiling time. Further, in the present embodiment, the time (minimum time) to be corrected by the correction means 11 is addition or subtraction of a fixed time of 1 minute, but it may be a fixed multiple of the required boiling time stored in the storage means 3. .. 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 addition, 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 case of the reserved operation, and the correction means 1
The required boiling time can be corrected with 1. Further, 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 first boiling determination means 10 are configured by a one-chip microcomputer. It goes without saying that you can do it. Further, since the heater 22 for keeping heat has only a heat flow of about 1 kW to 5 kW, for example, if the heater of 2 kW is 200 L
It takes about 8 minutes to raise the temperature of the bath water of 1K by 1K.
Therefore, it takes about 160 minutes to raise the temperature of 200 L of bath water from 20 ° C to 40 ° C. Therefore, unlike the gas water heater, it is not necessary to re-boil the remaining hot water of the previous day. .. 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, since the interval between the first bather and the next bather is long, the boiling time (T1) is required when the operation of the bath electric water heater is stopped and then the next bather restarts the operation. Since the boiling time is not referred to, the required boiling time is not corrected as described in the explanation of the operation flowchart of FIG.

[0019]

As is apparent from the above embodiments, the controller for the bath electric water heater of the present invention has the first boiling-up determination means for determining whether it is the first boiling-up and the first boiling-up determination. Only when the means determines that it is not the first boiling, the boiling time measured by the timer means is compared with the previous required boiling time stored in the storage means, and when a difference occurs, the previous required time is compared. When the time obtained by adding the correction to the boiling time is updated as the required boiling time and the correction means for storing it in the storage means is provided, and the storage means determines that the first boiling time determination means is the first boiling time. In, the boiling time measured by the timer means is stored as it is as the required boiling time, and with this configuration, even in the reserved operation at the time of extremely short boiling, It can be boiled at about the set time, and it does not boil at an early time even in the next reserved operation after long boiling, and it is possible to reduce the heat loss after boiling and the required boiling is done each time it is run. Since the boiling time is corrected, it can respond to changes in the boiling water filling temperature when the water temperature changes, or changes in the boiling time when the water temperature changes, which is of great practical value.

[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 Starting 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 Sensor 10 First Boiling Means 11 Compensation Means 24 Bathtub

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 first boiling determination means for determining whether it is the first boiling and only when the first boiling determination means determines that it is not the first boiling The boiling time measured by the timer means and the previous required boiling time stored in the storage means are compared with each other, and when a difference occurs, the time required for correction is added to the previous required boiling time. A correction means for updating the boiling time and storing it in the storage means is provided,
A bath electric water heater configured such that the storage means stores the boiling time measured by the timer means as the required boiling time as it is when the first boiling determination means determines that it is the first boiling. Control device.