JP2996039B2 - Electric 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 an electric water heater, and more particularly, to an electric water heater, which is provided with a two-time heater for heating and boiling water in a hot water storage tank. The present invention relates to an electric water heater in which the heater capacity can be switched in the midnight power time zone.

[0002]

2. Description of the Related Art FIG. 2 is a schematic diagram for explaining the structure of a conventional electric water heater. In FIG. 2, reference numeral 1 denotes a tank for storing hot water, reference numerals 2 and 3 denote heaters for heating water in the tank 1, and reference numeral 4 denotes a heater disposed below the outside of the tank 1. This is a thermostat that controls the boiling temperature of the water inside.

[0003] In a conventional late-night power electric water heater, which is a conventional electric water heater having the above-described configuration, the temperature of the heaters 2 and 3 for heating the water in the tank 1 is raised to an unnecessarily high temperature. In order not to reduce the watt density of the heater by using two heaters 2 and 3 for heating the water in the tank 1 as described above, the required rated power consumption is obtained. Is common.

FIG. 3 is a circuit diagram showing an electric circuit of the conventional electric water heater of FIG. In FIG. 3, reference numerals 2 and 3 represent FIG.
, A heater for heating the water in the tank 1, a thermostat 4 for controlling the boiling temperature of the water in the tank 1,
Reference numeral 5 denotes a power supply, and 6 denotes a time switch used in a midnight power time zone.
It operates (closes) so that power is supplied from the power supply 5 to the electric water heater from 0:00 to 7:00 of the next morning. Heater 2
And the heater 3 are connected in parallel, and are connected to a power source 5 via a thermostat 4 and a time switch 6.

[0005] A method for boiling water in the tank 1 in the conventional electric water heater configured as described above will be described. First, at 23:00 at midnight, the time switch 6 is operated (closed) to turn on the heaters 2 and 3 from the power supply 5.
The water in the tank 1 is heated by the heaters 2 and 3 and boiled.

When the water in the tank 1 is heated to a predetermined temperature, the thermostat 4 operates and the power supply 5
The power supply to the heaters 2 and 3 is stopped, and the time switch 6 returns (opens) at 7:00 am of the next morning when the midnight power time zone ends. The power supply to 3 is stopped.

In addition to the above-described conventional electric water heater, as disclosed in Japanese Patent Application Laid-Open No. 2-217747, a tank for storing hot water, an upper heater and a lower heater for heating water in the tank are disclosed. An electric water heater provided with a heater has been proposed in which the power supply to the upper heater is prioritized to the lower heater to boil water in the tank, and Japanese Patent Application Laid-Open No. 2-217748. And as disclosed in JP-A-2-219948,
In a tank for storing hot water and an electric water heater having an upper heater and a lower heater for heating water in the tank, appropriately controlling the automatic boiling means and the manual boiling means using the upper heater and the lower heater, There has been proposed one configured to boil water in a tank.

[0008]

The above-described conventional electric water heater is constructed as described above. When the water in the tank 1 is heated by the heaters 2 and 3 to be boiled, the rated power consumption of the water is reduced. Boiling was performed by the heater capacity.
However, when using an electric water heater that uses the largest amount of electric energy in a general household at the same time as other electric appliances, the temporary electric consumption sometimes becomes larger than necessary. However, there has been a problem that the contracted power (contract amperage) in the dwelling unit may be exceeded and a breaker (power breaker) may be dropped.

Further, in order not to exceed the contract power in the dwelling unit, the contract power must be increased more than necessary. As a result, an excessive power receiving facility must be installed in an apartment house. There was a problem of fear.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems. When an electric water heater is used at the same time as another electric device, the water in the tank of the electric water heater when boiling water is raised. An object of the present invention is to provide an electric water heater having a circuit configuration capable of switching a heater capacity of a heater for heating water in a tank in power consumption, that is, in a daytime power period and a midnight power time period.

[0011]

Means for Solving the Problems An electric water heater according to the present invention, the heating tank for the hot water storage, the water in the tank
Two heaters, common terminal COM and switching terminal
Two switching units having children A and B,
Time zone identification means for identifying the midnight power time zone,
One end of each of the two heaters has the two switching portions.
From the switching terminal B of one of the switching units to the common terminal CO.
M connected to one end of the power supply, one end of one heater
Is directly connected to the other end of the power supply, and the other end of the other heater is connected to the other end.
From the common terminal COM of the other switching unit via the switching terminal A
To the other end of the power supply or to the common terminal CO of the other switching unit.
Switching of one of the switching units from M via the switching terminal B
Connected from terminal A to one end of the power supply via common terminal COM
And the time zone identification means identifies that it is a midnight power time zone.
Power consumption in the daytime
If it is identified as a band, the power consumption of the heater will decrease.
The switching unit is switched as described above .

[0012]

The electric water heater according to the present invention has two switches.
Since the heating capacity can <br/> switch between the four levels from "OFF" to "Maximum" by parts, frequency of use of other electrical equipment
The power consumption of the heater is large in the late night power hours when
So that it can be used during the daytime
The switching section to reduce the power consumption of the heater.
Alternatively , the water in the tank can be boiled.

[0013]

[0014]

[Embodiment 1] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a circuit diagram showing an electric circuit of an electric water heater according to Embodiment 1 of the present invention. In FIG. 1, reference numerals 2 and 3 denote heaters for heating water in a tank 1 (not shown), reference numeral 4 denotes a thermostat for controlling the boiling temperature of water in the tank 1, reference numeral 5 denotes a power source, reference numeral 24 denotes a time switch, and reference numerals 10 and 11 denote electric power. Each of the switching units 10 and 11 has a common terminal COM and switching terminals A and B.

As shown in FIG. 1, the heater 3 is connected in parallel with the heater 2 through the common terminal COM of the switching section 10 and the switching terminal A. Thus, one of the parallel circuits of the heater 2 and the heater 3 is provided. Is through the thermostat 4 and the time switch 24, and the other is the switching terminal B of the switching unit 11.
Is connected to the power supply 5 via the common terminal COM.

In FIG. 1, reference numeral 20 denotes a control device having a time zone identification means for a daytime power time zone and a late-night power time zone in a "time-based light rate" system, and switching means for switching units 10 and 11. , 21 control the time of the daytime power zone and the midnight power time zone of the “time-based light rate” system by the control device 20.
Time zone setting means for inputting to the Reference numeral 22 denotes an additional heating setting means for performing additional heating during the daytime power hours.
23 is a power consumption setting means for selecting the connection method of the switching units 10 and 11 and changing the power consumption of the heaters 2 and 3;
Boiling setting means 22 and power consumption setting means 23 are connected to control device 20. 24 is a time switch controlled by the control device 20, and this time switch 24
It operates (closes) during the set midnight power time zone and during the daytime power time when the boiling setting in the daytime power time is set by the boosting setting means 22, and the power supply 5 supplies the heater 2, 3 is a time switch for supplying power to the power switch 3.

In the electric water heater according to the first embodiment of the present invention configured as described above, a combination of the connection methods of the switching units 10 and 11 of the connection circuit in the electric circuit is used.
For the power supply from the power source 5 to the heaters 2 and 3, the following combinations can be selected.

[0018]

[Table 1]

Therefore, when an electric water heater for boiling water in the tank 1 is used simultaneously with other electric equipment, the combination of the switching units 10 and 11 of the connection circuit is appropriately selected, so that the heater 2 can be used. , 3 can be changed. The operation method of boiling water in the tank 1 during the midnight power hours is as described in the above-described conventional example. At this time, other electric devices are disconnected while the water in the tank 1 is boiling. When using, the switching unit 1
By operating the heaters 0 and 11 so as to reduce the power consumption of the heaters 2 and 3, it is possible to prevent the breaker from dropping beyond the contract power.

In the electric water heater according to the first embodiment of the present invention configured as described above, the time of the daytime power zone and the time of the nighttime power zone set by the time zone setting means 21 are input to the control device 20. As a result, the control device 20 normally operates (closes) the time switch 24 to start power supply from the power supply 5 when the set midnight power time zone is reached,
At this time, the water in the tank 1 is boiled by the power consumption of the heaters 2 and 3 set by the switching units 10 and 11 set by the power consumption setting means 23, and when the midnight power time period ends, a time switch is set. 24 is restored (opened), and the power supply from the power supply 5 is cut off. In addition, boiling setting means 2
2, the control device 20 sets the time switch 2 in the daytime power time zone.
4 is operated (closed) to increase the boiling of water in the tank 1 by daytime electric power.

In a conventional electric water heater, the power consumption of the heaters 2 and 3 for boiling water in the tank 1 during the midnight power time zone and increasing the water boiling in the tank 1 during the daytime power time zone is as follows. In the electric water heater according to the first embodiment of the present invention configured as described above, when the electric water heater and other electric devices are used at the same time, the power consumption setting means 23 is used.
The power consumption of the heaters 2 and 3 can be changed between the daytime power zone and the midnight power time zone.

Embodiment 2 FIG. A circuit configuration diagram illustrating an electric circuit of the electric water heater according to the second embodiment of the present invention is the same as the circuit configuration diagram of the electric circuit of the electric water heater according to the first embodiment of the present invention illustrated in FIG. The electric water heater according to the second embodiment of the present invention shown in FIG.
In the “time-based lamp fee” system, when the water in the tank 1 is to be boiled in the late-night power time when the frequency of use of other electric equipment used simultaneously with the electric water heater is low, the power consumption setting means 23 is connected to the heater 2. , 3 are set to be “maximum”, and the power is increased during daytime power hours when the frequency of use of other electric equipment used simultaneously with the electric water heater is high. Power consumption of heaters 2 and 3 is "medium" or "minimum"
Set to be. By selecting the above setting conditions, the possibility of dropping the breaker exceeding the contracted power can be minimized.

[0023]

As described above, according to the electric water heater of the present invention, the heater capacity can be switched in four stages from "off" to "maximum" by the two switching portions.
If the identification means identifies that it is in the midnight power time zone, the heater
During the daytime power hours, power consumption will increase.
Switch to reduce power consumption of heater when identified
Daytime power hours when other electrical devices are frequently used
Even if an electric water heater is used simultaneously with other electric equipment in the belt, the water in the tank can be boiled without exceeding the contracted electric power. It has excellent effects such as eliminating the risk of having to be eliminated.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing an electric circuit of an electric water heater according to Embodiments 1 and 2 of the present invention.

FIG. 2 is a schematic diagram for explaining a configuration of a conventional electric water heater.

FIG. 3 is a circuit diagram showing an electric circuit of the conventional electric water heater of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tank 2, 3 Heater 4 Thermostat 5 Power supply 6 Time switch 10, 11 Switching part 20 Controller 21 Time zone setting means 22 Boiling setting means 23 Power consumption setting means 24 Time switch

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁶ , DB name) F24H 1/18 302

Claims (1)

(57) [Claims] A tank according to claim 1] for hot water storage, a heater composed of two heating water in the tank, and two switching portions having a common terminal COM and the switching terminal A, B, Day power
Time zone identification means for identifying a time zone and a midnight power time zone;
And both ends of the two heaters are the two heaters.
Via the common terminal COM from the switching terminal B of one switching unit of the switching unit is connected to one end of the power, one heating
The other end of the capacitor is connected to the other end directly the power supply, the other end of the power source via a switching terminal A from the common terminal COM of the other end of the other heaters other switching unit, or, the other change-over
Further forward from the common terminal COM of the replacement unit via the switching terminal B
The common terminal COM is connected from the switching terminal A of one of the switching units.
Connected to one end of the power supply via the
Is identified as the midnight power time zone,
Identifies daytime power hours as power increases
Then, turn off the heater so that the power consumption of the heater is reduced.
An electric water heater characterized by switching a replacement unit .