JP3125591B2 - Hot water storage water heater - Google Patents

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 power supply state of a hot water storage means 1, a boiling means 2 for boiling stored water in the hot water storage means 1 by an electric heater, and a power supply 5 connected to the boiling means 2. Hot water of a desired temperature is stored in hot water storage means 1 by the configuration of power supply detection means 4 and control means 3 for controlling boiling means 2. This type of hot water storage type water heater is roughly classified into two types depending on the type of power supply to be supplied. One is that power is supplied only at midnight by a time switch and the hot water is heated only at midnight (hereinafter referred to as “midnight power type”), and the other is 2
The power is supplied continuously for four hours, and the hot water can be heated not only in the middle of the night but also in the daytime (hereinafter, referred to as “time zone type”). Because the electricity rate system set by the electric power company sets the electricity rate at midnight cheaper than during the day, the time zone type mainly boiles hot water at midnight, and the hot water in hot water storage means 1 is used during the daytime when the electricity rate is high. Only when the amount is low, boil water by a predetermined amount.

[0003] In the time zone type, since the boiling operation differs between daytime and midnight, the control means 3 has a clock and operates based on the time. On the other hand, the midnight type performs boiling while power is supplied to the boiling means 2 regardless of time. As described above, since the operation differs between the time zone type and the midnight type, the control means 3 for controlling the operation must be provided in a dedicated manner 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. Switching from the type or the late night type to the type according to the time zone is desired. For this reason, 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 be able to handle both the time zone type and the late night type.

[0004]

The operation of the changeover switch 7 is performed by a contractor when the equipment is installed or when the type is switched at midnight according to time zone. 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, the original operation may not be 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 continues to be boiled during the day and the electricity bill increases. Conversely, if the control means 2 operates as a time zone type even if it is installed as a late night type, if the clock time of the control means 2 is different from the true time and indicates daytime at midnight, power is supplied. However, the boiling operation is restricted, and the amount of hot water stored is insufficient.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a hot water supply type water heater that does not make a mistake in the type of the night time and the type of the night time, that is, no waste of electricity and no shortage of hot water.

[0006]

In order to achieve the second object, a hot water storage type water heater according to the present invention controls a hot water storage means, a boiling means for boiling the water stored in the hot water storage means, and a boiling means. The control means and the heating means are connected to either the late-night power supplied only during the late-night power time zone by the time switch or the daytime power supplied continuously for 24 hours to detect the power supply to the heating means. Power detection means for outputting a power detection signal, and when the power detection signal is continuously detected for a first predetermined time or more, it is determined that daytime power is connected to the heating means, and the power detection signal is continuously output. A power supply automatic determination means for determining that midnight power is connected to the heating means when the detection is not possible for the second predetermined time or more and outputting a signal indicating a power supply form determination result and a power supply state to the control means; It was

[0007]

According to the present invention, the power supply automatic determination means automatically determines whether power is supplied for 24 hours or only at midnight by the above configuration. It can operate without any problem.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the hot water storage type water heater of the present invention will be described below with reference to FIG. FIG. 1 shows a configuration of a hot water storage type water heater as one embodiment of the present invention. Reference numeral 1 denotes a hot water storage means, and reference numeral 2 denotes a boiling means for boiling the water stored in the hot water storage means 1 by an electric heater. The boiling means 2 has a configuration in which an electric heater is disposed inside the hot water storage means 1, or the water stored in the lower part 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. It is configured to return to the upper part of the hot water storage means 1. The control means 3 operates the boiling means 2 so as to store hot water having a desired hot water temperature in the hot water storage means 1. Reference numeral 5 denotes a power supply connected to the boiling means 2. When used as a midnight type, the power supply 5 is supplied only at midnight by a time switch. When using as a time zone type, power supply 5
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, 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 is not supplied for the remaining 16 or 15 hours. . In addition, according to the regulations of the electric power company, when a power outage occurs due to electrical work, the maximum is 4 hours. Therefore, when the power is not supplied for more than 4 hours, it can be determined that the power is not supplied by the time switch. When the power is supplied for more than 10 hours in consideration of the error of the time switch, the power is continuously supplied for 24 hours. It can be determined that it has been supplied.

The automatic power source judging means 6 inputs a power source detection signal and measures a time during which power is supplied or a time during which power is not supplied. When the power is supplied, the automatic power supply determination unit 6 determines that the power supply 5 is the daytime power supplied continuously for 24 hours when the measurement time exceeds 10 hours. When power is not supplied, the automatic power supply determination means 6 determines that the power supply 5 is midnight power supplied only at midnight when the measurement time exceeds 4 hours. Until the measurement time reaches a predetermined value, the content determined last time is held. The automatic power source discriminating means 6 constantly outputs the content of the power source type judgment and the power supply state to the control means 3 as a signal.

The control means 3 determines the operation based on the content of the signal input from the automatic power supply determination means 6. Since two kinds of information of the power supply type and the power supply state are sent from the automatic power supply discriminating means 6, it operates as a time zone type or a midnight type depending on the contents of the power supply form, and the boiling or stop of the boiling depending on the power supply state. I do.

A specific example of the operation will be described with an example in which the power supply 5 is switched from midnight power to daytime power. First, it is assumed that the power source automatic determination means 6 has already determined that the power source 5 is midnight power. Since the power supply 5 is supplied with power only at midnight by the time switch, the automatic power supply discriminating means 6 outputs a signal to the control means 3 in the daytime in such a manner that the power supply mode is midnight power and the power is not supplied. If the power is not supplied to the heating means 2, the heating is impossible, so the control means 3 instructs the heating means 2 to stop the heating operation. When the power is supplied by the time switch at midnight, the power automatic determination means 6 starts measuring the power supply time, and the control means 3 has a power supply mode of midnight power and power supply. Output signal.
When the power supply is midnight power, the heating operation is always performed while the power is supplied to the heating device 2.
Instructs the boiling means 2 to start the boiling operation. In the morning, the power supply is stopped by the time switch. Since power is supplied by the time switch for 8 to 9 hours, the power supply time measured by the automatic power supply determination means 6 does not exceed 10 hours, which is the daytime power determination condition. The automatic power source discriminating means 6 holds information that the power mode is midnight 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 indicating that the power supply mode is midnight power and the power is not supplied. . The control means 3 instructs the heating means 2 to stop the heating operation. Since the power supply is stopped by the time switch for 15 to 16 hours, the automatic power supply discriminating means 6 re-determines that the power supply mode is midnight power when 4 hours which is a condition for determining the power supply at midnight has elapsed since the power supply was stopped. Determine.

It is assumed that while the power supply is stopped by the time switch, the power supply 5 is changed from midnight power to daytime power and power supply is started. At this point, the automatic power supply determining means 6 cannot distinguish whether the power supply is midnight power or daytime power. Since the power was supplied, the automatic power supply determining means 6 starts measuring the power supply time,
A signal is output to the control means 3 in such a manner that the power supply mode is midnight power and power is supplied. The control means 3 instructs the boiling means 2 to start a boiling operation. Since the power supply 5 has been 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 a daytime power determination condition, has elapsed since the start of power supply. From this point on, the power mode for the control means 3 is daytime power,
It outputs a signal that power is being supplied. The control unit 3 switches the operation from the midnight type operation to the time zone type operation since the power supply mode is daytime electric power.

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

Since the power source 5 is a daytime power source,
Power is supplied continuously for 4 hours, but power outages may occur due to electrical work, lightning, etc. When a power failure occurs, the power supply is not stopped. Therefore, the automatic power supply determination unit 6 starts measuring the power supply stop time, and the control unit 3 receives a signal indicating that the power supply mode is daytime power and the power supply is not performed. Output. The control means 3 instructs the heating means 2 to stop the heating operation. Since there is a regulation of the electric power company that the power outage due to the electric work is up to 4 hours, the automatic power source determination means 6
Does not exceed 4 hours, which is the midnight power confirmation condition. Therefore, it is not erroneously determined that the power is late at night due to a power failure.

[0016]

As described above, according to the hot water supply type water heater of the present invention, the automatic power supply determining means measures the power supply time and the power supply stop time, and automatically determines the power supply form from the measured time, thereby controlling the control means. Therefore, a changeover switch for setting the contents of the power supply form can be eliminated. Since operation of the changeover switch is unnecessary, there is no mistake in setting of the changeover switch, incorrect setting, and error in power supply form information due to failure of the changeover switch. Since there is no error in the power supply form information, the power supply operates reliably as a late-night type or a time-based type, and does not suffer from problems such as wasting of electricity bills and shortage of hot water storage. 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 becomes unnecessary. Further, the cost can be reduced by the material cost of the changeover switch.

[Brief description of the drawings]

FIG. 1 is a block diagram of a hot water storage type water heater according to one 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

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-4-347455 (JP, A) JP-A-5-215400 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F24H 1/18 301-302

Claims (1)

(57) [Claims] 1. A hot water storage means, a boiling means for boiling stored water of the hot water storage means, a control means for controlling the boiling means, and the boiling means are supplied only by a time switch to a midnight power time zone. Power supply means for detecting power supply to the heating means and outputting a power supply detection signal, and connecting the power supply detection signal continuously. When it is detected for a first predetermined time or more, it is determined that daytime power is connected to the boiling means, and when the power detection signal is not continuously detected for a second predetermined time or more, the boiling is performed. A hot-water storage type water heater comprising automatic power source determining means for determining that midnight power is connected to the means and outputting a signal indicating a power mode determination result and a power supply state to the control means.