JPH05203256A - Automatic bath electric water heater - Google Patents

Abstract

PURPOSE:To prevent the loss of heat dissipation due to the shortage of the filling of hot water and the time of too-early hot-water filling by automatically conducting the filling of hot water at a reserved optimum time in automatic hot-water filling to a bathtub. CONSTITUTION:A correction means 34 compares a heating-up time measured by a timer means 32 and a required heating-up time stored in a storage means 30, and corrects the required heating-up time stored in the storage means 30 only by a minimum time. Since the required heating-up time stored in the storage means 30 and a fixed time go back to a reserved set time and a startup means starts automatic bath operation, heating-up is performed at the reserved set time even in the next reserved operation of extremely short heating-up while heating-up is carried out at an early time even in the next reserved operation of long-time heating-up, thus minimizing the increase of the loss of heat dissipation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic bath electric water heater which is completed at the time when a reserved hot water bath is reserved.

[0002]

2. Description of the Related Art In recent years, the function of water heaters has been remarkably improved,
There has been progress in automatic bath water heaters that automatically fill the bathtub with hot water from a water heater with a hot water supply function and keep warm.
Further, an automatic bath water heater has also been invented in which an automatic bath water heater has a reservation timer function to complete automatic hot water beaming at a set reservation time. However, compared to a water heater using gas or oil as a heat source, an automatic water heater for an electric water heater using electricity as a heat source has been delayed.

Conventionally, a circuit block diagram for reservation of this type of automatic bath water heater has been constructed as shown in FIG.
The reservation start time set by the reservation time setting means 2 and the required boiling time stored in the storage means 3 are input to the operation starting means 1. The output of the operation start means is output to the automatic bath control means 4 and the timer means 5. The boil-up detection means 6 detects that the thermistor 7 has reached the set temperature,
A boiling signal is output to the timer means 5. The timer means 5 starts the timer when a signal is input from the operation starting means 1, and stops the timer when a boiling signal is input from the boiling detection means 6. The boiling time T1 measured by the timer means 5 is output to the storage means 3. The residual water determination means 8 outputs a storage prohibition signal to the storage means 3 when the water level sensor 9 detects the water level at the start of the automatic bath operation and determines that there is residual water. The storage means 3 stores the boiling time T1 measured by the timer means 5 in the storage means 3 as the required boiling time when the storage prohibition signal is not input from the residual water determination means 8.

The above operation will be described with reference to FIG. FIG. 5 is an operation flowchart regarding reservation of a conventional automatic bath water heater. First, in process 10, the current time is
It is determined whether it is a time retroactive to the required boiling time from the set time of the reservation. If the current time reaches the time required for boiling up from the set time of the reservation, the process 11
Then, the timer of the timer means 5 for the automatic bath operation is started. When the residual water determination means 8 determines in step 12 that there is no residual water, the procedure proceeds to step 13 and waits until the boiling detection means 6 detects boiling. If the boiling detection means 6 detects the boiling, the timer of the timer means 5 is stopped in step 14. The value of the timer at this time is T1. In process 15, T1 obtained in process 14 is updated as the required boiling time and stored in the storage means 3. When it is determined in the process 12 that there is residual water, the process ends without updating the required boiling time in the storage means 3.

That is, when there is no residual water in the bathtub, the time T1 required for the previous boiling is stored and the automatic bath operation is started at a time T1 earlier than the preset time.

[0006]

In the conventional example, when there is no remaining hot water, the automatic bath operation is started based on the previous boiling time. When set extremely low, boiling time T1
Also becomes shorter. Therefore, next time when the hot water level is returned to the normal water level and the reserved operation is performed, the automatic bath operation starts T1 backward from the reserved set time, so that there is a problem that the bath does not boil even at the reserved time. Was there.

In addition, when hot water is used before the boiling is completed during the previous automatic bath operation and the boiling time T1 becomes long, the automatic operation is performed by going back to the time T1 which is longer than the reserved time at the next reserved operation. Since I will start bathing,
There was also a problem that it boiled up at an early time and the heat radiation loss thereafter increased.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and provide an automatic bath electric water heater which has a simple structure and completes the automatic hot water beam at the reserved time.

[0009]

To achieve this object, the present invention provides a reserved time setting means for setting a reserved boiling time, a water level sensor for detecting a water level in a bath, and a boiling water for a bath. Boiling detection means, storage means for storing the required boiling time from the start of automatic bath operation to boiling, and timer means for measuring the time from the start of automatic bath operation until the boiling detection means detects boiling Then, when the boiling time measured by the timer means at the time of boiling and the previous required boiling time stored in the storage means are compared and a difference occurs, the previous required boiling time is corrected. Correcting means for updating the time as the required boiling time and storing it in the storage means, and when the water level sensor detects that there is residual water in the bathtub at the start of the automatic bath operation, Remaining water determination means for prohibiting correction by the correction means, and automatic bath operation traced back from the reserved time set by the reserved time setting means to the required boiling time stored in the storage means plus a predetermined time Is to start.

[0010]

According to the present invention, 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. Only correct. Furthermore, since the operation start means starts the automatic bath operation by going back a predetermined time and the required boiling time stored in the storage means from the reserved set time, the reserved set time will be set even in the next reserved operation with extremely short boiling. It minimizes the increase in heat loss due to boiling and boiling at an early time even in the next reserved operation after long boiling.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is a system configuration diagram of the automatic bath electric water heater according to the embodiment of the present invention. The pipe from the water supply source is connected to the hot water storage tank 12 and the water valve 13 via the pressure reducing valve 11. The water guided to the hot water storage tank 12 pushes up the hot water in the hot water storage tank 12, and is connected to the general hot water supply pipe and the hot water valve 14. Water valve 1
The outlet of 3 and the outlet of the hot water valve 14 are connected, and the pouring solenoid valve 1
5, first check valve 16, vacuum valve 17, second check valve 1
8, thermistor 19, heat insulation heater 20, bath piping 2
1 to be connected to the bathtub 22. The bath return pipe 23 connected to the bathtub 22 includes a water level sensor 25 and a pump 2.
6. A two-way valve 27 is connected between the second check valve 18 and the thermistor 19.

The automatic bath operation of the automatic bath electric water heater having such a configuration will be described. First, when the automatic bath operation is started, the pouring solenoid valve 15 is opened and the water valve 1
3. Hot water mixed at an appropriate temperature by the hot water valve 14 is poured into the bathtub 22. At this time, the two-way valve 27 is closed and the bath return pipe 2
Through 3, the pressure of the hot water in the bathtub 22 is detected by the water level sensor 25. When the water level sensor 25 detects the set water level, the pouring electromagnetic valve 15 is closed, the two-way valve 27 is opened, the pump 26 is turned on, the bath water is circulated, and the water is heated by the heater 20. When it detects that the thermistor 19 has reached the set temperature, the heat insulation heater 20 and the pump 26 are turned off, and the two-way valve 27
Close to complete boiling. Such control is performed by the automatic bath control means (not shown).

Next, the control circuit configuration will be described with reference to FIG. FIG. 1 is a circuit block diagram relating to reservation of an automatic bath operation according to an embodiment of the present invention. The reservation start time set by the reservation time setting means 29 and the required boiling time stored in the storage means 30 are input to the operation starting means 28. The output of the operation starting means 28 is the automatic bath control means 31.
Is output to the timer means 32. Boiling detection means 3
3 detects that the thermistor 19 has reached the set temperature,
A boiling signal is output to the timer means 32. The timer means 32 starts the timer when a signal is input from the operation starting means 28, and stops the timer when a boiling signal is input from the boiling detection means 33. Timer means 32
The boiling time T1 measured at is output to the correction means 34.

The remaining water determination means 35 determines that there is remaining water when the water level sensor 25 detects the water level at the start of the automatic bath operation, and outputs a correction prohibition signal to the correction means 34.
The correction unit 34 compares the required boiling time stored in the storage unit 30 with the boiling time T1 measured by the timer unit 32 when the correction prohibition signal is not input from the residual water determination unit 35, and the required The boiling time is corrected and output to the storage means 30.

The operation at the time of reservation will be described below with reference to FIG. FIG. 3 is an operation flowchart regarding reservation according to the embodiment of the present invention. First, in process 36, it is determined whether or not the current time is a time backward from the set time of the reservation by adding the predetermined boiling time T0 to the required boiling time. The current time is a predetermined time T from the set time of the reservation to the required boiling time.
When the time goes back by adding 0, the process 37
Then, start the automatic bath operation. At this time, the timer means 32
To start the timer. When the residual water determination means 35 determines in step 38 that there is no residual water, the procedure proceeds to step 39 and waits until the boiling point detection means 33 detects boiling. When the boil-up detecting means 33 detects the boil-up, the timer of the timer means 32 is stopped in process 40. The value of the timer at this time is T1. T1 is data in minutes, and data less than seconds is truncated.

In process 41, T1 obtained in process 40 is compared with the required boiling time stored in the storage means 30, and T1 is calculated.
If 1 is larger than the required boiling time, the process 42 is proceeded to.
In process 42, the required boiling time is lengthened by 1 minute and stored in the storage means 30 as a new required boiling time. Process 4
If T1 is not greater than the required boiling time in step 1, the process proceeds to step 43, and T1 obtained in step 40 is compared with the required boiling time stored in the storage means 30, and if T1 is less than the required boiling time. Go to processing 44. In process 44, the required boiling time is shortened by 1 minute and is stored in the storage means 30 as a new required boiling time. If T1 is not smaller than the required boiling time in the process 43, the process ends without updating the required boiling time in the storage unit 30. In addition, processing 38
Even when the residual water determination means 35 determines that there is residual water in step 3, the processing ends without updating the required boiling time in the storage means 30.

An example of an actual reserved operation will be described with reference to Table 1. Table 1 shows an example of the reservation operation in the case where the initial value of the required boiling time is 20 minutes, the predetermined time T0 is 3 minutes, and the reservation set time is 19:00. In the example in Table 1, the normal boiling time is 15 minutes, and during the 7th reserved operation, the water level was extremely low and the water level was extremely low. Since I used hot water while boiling, it took 18 minutes to boil.

[0018]

[Table 1]

In Table 1, since data of 20 minutes is stored in the storage means 30 as the initial value of the required boiling time at the time of the first reserved operation, the operation start means 1 starts the operation in the automatic bath control means 4. Is 20 minutes after the reserved time 19:00, and is 18:37, which is 3 minutes after the preset time (T0). Since the time (T1) until the first boiling is measured by the timer means 32 is 15 minutes, it is shorter than the required boiling time 20 minutes stored in the storage means 30. Therefore, the correction unit 34 shortens the required boiling time by 1 minute to 1
It is set to 9 minutes and stored in the storage means 30. In this way
At the time of the sixth reserved operation, since the data that the required boiling time is 15 minutes, which is equal to the normal boiling time (T1), is stored in the storage means 30, the automatic bath operation start time is 18:42, and the boiling is started. The rising time is 18:57. 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.

At the time of the 7th reserved operation, the boiling water level was extremely low, so that the boiling time (T1) was 10 minutes. However, since the correction means 34 shortens the required boiling time by 1 minute to 14 minutes and stores it in the storage means 30, the required boiling time is set to 14 at the time of the eighth reserved operation.
As a minute, the automatic bath operation is started at 18:43. Since the boiling time (T1) at this time is 15 minutes, the boiling time is 18:58. Therefore, although the previous boiling time (T1) was extremely short, 10 minutes compared to the normal 15 minutes, this boiling is 2 minutes before the reserved time 19:00. be able to.

During the ninth reserved operation, the boiling time (T1) is 1 because the user used hot water while boiling water.
It's been 8 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 is set to 3 minutes, it is boiling up at the reservation set time. Correction means 3
In No. 4, the required boiling time is increased by 1 minute to 16 minutes and is stored in the storage means 30. Therefore, during the 10th reserved operation, the required boiling time is 16 minutes and the automatic bath operation is started at 18:41. The boiling time (T1) at this time is 15
Since it is a minute, the boiling time is 18:56. Therefore, although the previous boiling time (T1) was 18 minutes longer than the normal 15 minutes, this time, it only boils 1 minute earlier, and the increase in heat radiation loss is reduced.

As described above, in the automatic bath electric water heater of the embodiment of the present invention, the correction means 34 compares the boiling time measured by the timer means 32 with the required boiling time stored in the storage means 30, The required boiling time stored in the storage means 30 is corrected only for 1 minute per boiling.
Further, since the operation starting means 28 starts the automatic bath operation by going back from the preset set time to the required boiling time stored in the storage means 30 and a predetermined time, the reservation is made even in the next reserved operation of extremely short boiling. In addition to being able to boil at the set time, it is possible to minimize the increase in heat dissipation loss due to boiling at an early time even in the next reserved operation after long boiling.

Further, since the required boiling time is corrected by the correcting means 34 every time the automatic bath operation is performed, the boiling time changes when the hot water beam set temperature is changed or the water temperature is changed depending on the season. Can handle.

In the present embodiment, the predetermined time is set to 3 minutes, but the time to be corrected by the correction means 34 (1 minute in the present embodiment).
The longer the better. That is, a predetermined time longer than the time to be corrected by the correction means 34 is required to boil at the reserved set time even if the required boiling time changes once. 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 this embodiment, the correction time by the correction means 34 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.

In the present embodiment, the correction time by the correction means 34 is addition or subtraction of a fixed time of 1 minute, but it may be a fixed multiplication factor of the required boiling time stored in the storage means 30. For example, when the required boiling time is lengthened, the required boiling time is multiplied by 1.1 and stored in the storage means 30, and when the required boiling time is shortened, the required boiling time is multiplied by 0.9 and the storage means 30. 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 (not shown) instead of the reserved operation, the boiling time is set in the same manner as the reserved operation. It goes without saying that the required boiling time is corrected by the measurement by the measuring means 34.

Needless to say, the operation starting means 28, the reserved time setting means 29, the storage means 30, the timer means 32, the boiling detection means 33, the correction means 34, and the residual water determination means 35 can be constituted by a one-chip microcomputer.

In an automatic bath electric water heater that uses electricity as a heat source, the warming heater for circulating the hot water in the bathtub to keep it warm has only a heat flow of about 1 kW to 5 kW. For example, it takes about 8 minutes to raise the temperature of 200 L of bath water 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 high-temperature hot water is used for boiling.

Therefore, in the automatic bath electric water heater, the remaining water determination means 35 determines that there is remaining water only in the following situations. In a certain family, my father thought that he would not take a bath because he came home late that day, and after stopping the automatic bath driving on that day, his father went home and he restarted the automatic bath driving because he wanted to take a bath. Such is the case. In such a case, since the boiling time (T1) does not serve as a reference for the required boiling time, the required boiling time is not corrected as described in the operation flowchart of FIG.

[0031]

As is apparent from the above embodiments, in the present invention, the correction means compares the boiling time measured by the timer means with the required boiling time stored in the storage means and stores it in the storage means. Correct the required boiling time by the minimum time. Furthermore, since the operation start means starts the automatic bath operation as early as the required boiling time stored in the storage means from the preset setting time, the automatic bath operation is started earlier, so that the reservation setting is made even for the next reserved operation with an extremely short boiling time. In addition to being able to boil at the time, it is possible to minimize the increase in heat dissipation loss due to boiling at an early time even in the next reserved operation after long boiling.

[Brief description of drawings]

FIG. 1 is a circuit block diagram related to reservation of automatic bath operation of an automatic bath electric water heater according to an embodiment of the present invention.

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

FIG. 3 is an operation flowchart regarding the reservation.

FIG. 4 is a circuit block diagram for reservation of a conventional automatic bath water heater.

FIG. 5 is an operation flowchart for the same reservation.

[Explanation of symbols]

 25 Water Level Sensor 28 Operation Starting Means 29 Reserved Time Setting Means 30 Storage Means 32 Timer Means 33 Boiling Detection Means 34 Correcting Means 35 Remaining Water Judging Means

Claims (1)

[Claims] Claims: 1. A reserved time setting means for setting a reserved boiling time, a water level sensor for detecting the water level in the bathtub, a boiling detection means for detecting the boiling of the bath, and from the start of the automatic bath operation to the boiling. The storage means for storing the required boiling time, the timer means for measuring the time from the start of the automatic bath operation until the boiling detection means detects boiling, and the boiling measured by the timer means when boiling When the time is compared with the previous required boiling time stored in the storage means and a difference occurs, the time obtained by correcting the previous required boiling time is updated as the required boiling time and stored in the storage means. Correction means and residual water determination means for prohibiting correction by the correction means when the water level sensor detects that there is residual water in the bathtub at the start of automatic bath operation. Automatic bath electric hot water provided with operation start means for starting the automatic bath operation by going back a predetermined time from the reserved time set by the reserved time setting means to the required boiling time stored in the storage means vessel.