JPH0875247A - Hot water storage type water heater - Google Patents

Abstract

(57) [Summary] [Object] An object of the present invention is to provide a hot water storage water heater that reliably operates in accordance with the power source mode regardless of whether late-night power or daytime power is connected as a power source. [Structure] The power supply automatic determination means 6 measures the power supply time and the power supply stop time of the power supply 5, automatically determines the power supply form from the measured time, and outputs the determination result to the control means 3, so that the control means 3 becomes the power supply form. Perform a boiling operation according to.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water storage type water heater.

[0002]

2. Description of the Related Art A conventional hot water storage type water heater will be described with reference to FIG. The hot water storage type water heater shown in FIG. 2 detects a hot water storage means 1, a boiling means 2 for boiling up stored water in the hot water storage means 1 by an electric heater, and a power supply state of a power source 5 connected to the boiling means 2. Hot water of a desired temperature is stored in the hot water storage means 1 by the configuration of the power supply detection means 4 and the control means 3 that controls the boiling means 2. This type of hot water storage type water heater is roughly classified into two types depending on the form of the power supply. One is that the power is supplied only at midnight by the time switch and the hot water is boiled only at midnight (hereinafter referred to as "midnight power type"), and the other is 2
Power is supplied continuously for 4 hours, and hot water can be boiled not only at midnight but also during the daytime (hereinafter referred to as "time zone type"). Since the electricity rate system set by the electric power company sets the electricity rate at midnight to be cheaper than that at daytime, the type by time of day mainly heats the water at midnight, and the hot water of the hot water storage means 1 is used during the day when the electricity rate is high. Only when it becomes low, boil hot water for a specified amount.

Since the time zone type has different boiling operations in the daytime and late at night, the control means 3 has a clock and operates based on the time. On the other hand, the midnight type performs boiling regardless of the time while the power is being supplied to the boiling means 2. Since the time zone type and the midnight type have different operations as described above, the control means 3 for controlling the type must be prepared according to the type. However, whether to use the time zone type or the late night type is determined by the user's family structure and lifestyle, so if there is a change in the user's family structure and lifestyle, the time zone type or the midnight type is used. It is desired to switch from the night type or the late night type to the hourly type. Therefore, the control means 2 is set to the time zone type or the late night type by the changeover switch 7.
It is configured to support both time zone type and late night type.

[0004]

The operation of the change-over switch 7 is performed by the contractor when the equipment is installed or when the type is changed by the time zone or at midnight. At this time, if the contractor forgets or makes a mistake in setting the changeover switch 7 or if the changeover switch 7 is out of order, there is a possibility that the original operation is not performed. That is, if the control means 2 operates as a late-night type even if it is installed as a time zone type, hot water will continue to be boiled during the day and the electricity rate will increase. On the contrary, if the control means 2 operates as a time zone type even if it is installed as a midnight type, when the clock time of the control means 2 is different from the true time and indicates the daytime at midnight, power is supplied. However, the boiling operation is limited and the amount of hot water stored is insufficient.

[0005] Therefore, an object of the present invention is to provide a hot water storage type water heater which does not confuse the type of time zone and late night type, and which does not waste electric charges and lack hot water.

[0006]

In order to achieve the above-mentioned first object, the hot water storage type water heater of the present invention controls hot water storage means, boiling means for boiling up the water stored in the hot water storage means, and boiling means. The control means and the boiling means are connected by a time switch to either midnight power which is supplied only during the midnight power time zone or daytime power which is continuously supplied for 24 hours, and detects the power supply to the boiling means. When the power supply detection means that outputs the power supply detection signal and the power supply detection signal are continuously detected for the first predetermined time or more, it is determined that the daytime power is connected to the boiling means, and the power supply detection signal is continuously output. When it is not detected for a second predetermined time or longer, it is determined that late-night power is connected to the boiling means, and a power source automatic determination means for outputting a signal indicating the power supply form determination result and the power supply state to the control means Is what

[0007]

According to the present invention, with the above-described structure, the automatic power source determination means automatically determines whether the power source is being supplied for 24 hours or only at midnight. It can operate without fail.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the hot water storage type water heater of the present invention will be described below with reference to FIG. FIG. 1 shows the configuration of a hot water storage type water heater as an embodiment of the present invention. Reference numeral 1 is a hot water storage means, and 2 is a boiling means for boiling up the stored water of the hot water storage means 1 with an electric heater. The boiling means 2 has a structure in which an electric heater is provided inside the hot water storage means 1, or the water stored in the lower portion of the hot water storage means 1 is guided to the outside of the hot water storage means 1 by a circulation pump or the like and is heated by the electric heater. The hot water storage means 1 is returned to the upper part. The control means 3 controls the boiling means 2 and operates to store the hot water having a desired hot water temperature in the hot water storage means 1. Reference numeral 5 denotes a power source connected to the boiling means 2. When used as a late-night type, the power supply 5 is supplied only at midnight by a time switch. In addition, power supply 5 when used as a time zone type
Is supplied for 24 hours. The supply state of the power supply 5 is detected by the power supply detection means 4 and the power supply detection means 4 outputs a power supply detection signal to the automatic power supply determination means 6.

Normally, the midnight power is supplied by a time switch for 8 hours from 11:00 pm to 7:00 am or 9 hours from 11:00 pm to 8:00 am depending on the area, and the remaining 16 or 15 hours is not supplied with power. . In addition, according to the regulations of the electric power company, if there is a power outage due to electrical work, the maximum is 4 hours. Therefore, if the power is not supplied for 4 hours or more, it can be determined that the power is not being supplied by the time switch. Considering the error of the time switch, if the power is supplied for 10 hours or more, the power is continuously supplied for 24 hours. It can be determined that it is being supplied.

The automatic power source determination means 6 inputs a power source detection signal and measures the time when the power source is supplied or the time when the power source is not supplied. When the power is being supplied, when the measurement time exceeds 10 hours, the power automatic determination means 6 determines that the power 5 is the daytime power continuously supplied for 24 hours. When the power is not supplied, when the measurement time exceeds 4 hours, the automatic power supply discrimination means 6 determines that the power supply 5 is the midnight power supplied only at the midnight. The previously determined content is retained until the measurement time reaches a predetermined value. The automatic power source discriminating means 6 constantly outputs the contents of the power source mode determination and the power supply state to the control means 3 as signals.

The control means 3 determines the operation according to the content of the signal input from the automatic power source discrimination means 6. Two pieces of information, that is, the type of power supply and the state of power supply are sent from the automatic power source discrimination means 6, so that it operates as a time zone type or a midnight type depending on the content of the power source, and boil or stop boiling depending on the state of power supply. To do.

A specific example of the operation will be described by taking the case where the power source 5 is switched from the midnight power to the daytime power as an example. First, it is assumed that the automatic power source discrimination means 6 has already determined that the power source 5 is a midnight power source. Since the power source 5 is supplied with power only at midnight by the time switch, the automatic power source discriminating means 6 outputs a signal to the control means 3 in the daytime in the form of power source at midnight and no power is being supplied. Since the boiling is impossible unless the power is supplied to the boiling means 2, the control means 3 instructs the boiling means 2 to stop the boiling operation. When the power is supplied by the time switch at midnight, the automatic power supply discriminating means 6 starts measuring the power supply time, and the control means 3 is in the form of power supply at midnight and power is being supplied. Output a signal.
When the power supply form is midnight power, since the boiling operation is always performed while the power is being supplied to the boiling means 2, the control means 3
Instructs the boiling means 2 to start the boiling operation. In the morning, the time switch stops the power supply. Since the power is supplied by the time switch from 8 hours to 9 hours, the power supply time measured by the automatic power supply discrimination means 6 does not exceed the daytime power confirmation condition of 10 hours. The automatic power source discrimination means 6 holds information that the power source type is late-night power. Therefore, when the power supply is stopped, the automatic power supply determination means 6 starts measuring the power supply stop time, and outputs a signal to the control means 3 with the content that the power supply mode is midnight power and no power is supplied. . The control means 3 instructs the boiling means 2 to stop the boiling operation. Since the power supply is stopped by the time switch for 15 to 16 hours, the automatic power supply discrimination means 6 re-establishes that the power supply mode is the midnight power when 4 hours, which is the condition for confirming the midnight power after the power supply is stopped. Determine.

It is assumed that the power supply 5 is changed from the midnight power to the daytime power and the power supply is started while the power supply of the power supply 5 is stopped by the time switch. At this point of time, the automatic power source discriminating means 6 cannot distinguish whether the power source mode is late-night power or daytime power. Since the power is supplied, the automatic power supply discrimination means 6 starts measuring the power supply time, and
A signal is output to the control means 3 in the form of power supply of late night power supply. The control means 3 instructs the boiling means 2 to start the boiling operation. Since the power supply 5 is continuously energized for 24 hours, the automatic power supply determination means 6 determines that the power supply mode is daytime power when 10 hours, which is the daytime power determination condition, has elapsed from the start of power supply. From this point, the power supply mode for the control means 3 is daytime power,
A signal is output indicating that power is being supplied. The control means 3 switches from the midnight type operation to the time zone type operation because the power source is daytime power.

In the midnight type, the boiling operation is performed while the power is being supplied, whereas in the time zone type, the boiling operation is mainly performed in the middle of the night, and the electricity charge is high in the daytime, so the boiling operation is auxiliary. I do. That is, in the daytime, when the user operates a switch or when the amount of hot water stored in the hot water storage unit 1 becomes small, the boiling is performed for a predetermined time, and after the boiling for a predetermined time, the power is supplied even if the power is supplied. Stop raising operation. Whether it is midnight or daytime is determined by the time of the clock of the control means 3.

Since the power source 5 is daytime power, it is basically 2
It will be energized for 4 hours continuously, but there may be a power outage due to electrical work and lightning strikes. When a power failure occurs, the power supply is not stopped, so the automatic power supply discrimination means 6 starts measuring the power supply stop time, and the control means 3 is signaled that the power supply is in the daytime power supply and the power supply is not supplied. Output. The control means 3 instructs the boiling means 2 to stop the boiling operation. Since there is a stipulation by the electric power company that a power failure will occur up to 4 hours due to electrical work, automatic power source discrimination means 6
The power supply stoppage time measured by does not exceed 4 hours, which is the condition for determining the midnight power. Therefore, the power failure does not cause a false determination that it is midnight power.

[0016]

As described above, according to the hot water storage type hot water supply apparatus of the present invention, the automatic power source discrimination means measures the power source supply time and the power source supply stop time and automatically determines the power source form from the measured time, thereby controlling means. On the other hand, it is possible to eliminate the need for a changeover switch for setting the contents of the power source form. Since the operation of the changeover switch is not necessary, there is no mistaken setting of the changeover switch, erroneous setting, or error in the power supply form information due to failure of the changeover switch. Since there is no error in the power supply form information, it operates reliably as a late-night type or a time zone type, and problems such as waste of electricity charges and shortage of hot water storage do not occur. Since the setting of the changeover switch is performed at the time of construction, the workability can be improved because the setting of the changeover switch is unnecessary. Further, the cost of the material of the changeover switch can be reduced.

[Brief description of drawings]

FIG. 1 is a block diagram of a hot water storage water heater according to an embodiment of the present invention.

FIG. 2 is a block diagram of a conventional hot water storage type water heater.

[Explanation of symbols]

 1 hot water storage means 2 boiling means 3 control means 4 power supply detection means 5 power supply 6 power supply automatic discrimination means

Claims (1)

[Claims] 1. A hot water storage means, a boiling means for boiling up the water stored in the hot water storage means, a control means for controlling the boiling means, and a time switch for supplying only the midnight power time zone to the boiling means. Connected to either the midnight power or the daytime power that is continuously supplied for 24 hours, and continuously connects the power supply detection signal with the power supply detection means that detects the power supply to the boiling means and outputs a power supply detection signal. If it is detected for a first predetermined time or longer, it is determined that daytime electric power is connected to the boiling means, and if the power supply detection signal cannot be continuously detected for a second predetermined time or longer, the boiling is performed. A hot water storage type hot water supply device comprising a power source automatic determination means for determining that late-night power is connected to the means and outputting a signal indicating a power source form determination result and a power supply state to the control means.