JPH068445Y2 - Hot water storage type electric water heater - Google Patents

Description

[Detailed Description of the Invention] Purpose of the Invention (Field of Industrial Application) The present invention relates to an improvement of a hot water storage type electric water heater that boiles hot water to store hot water during the midnight power hours.

(Prior Art) Conventionally, the midnight power hours when power demand is low (for example,
There is a known hot water storage type electric water heater that boiles hot water to store hot water from 11:00 pm (23:00) to 7:00 am. In this conventional hot water storage type electric water heater, an electric heater is provided in the lower portion of the hot water storage tank, and power is supplied to the electric heater during the midnight power time period to boil the hot water.

However, this conventional hot water storage type electric water heater has a drawback that it cannot provide hot water having a capacity larger than the hot water storage capacity. Therefore, as shown in FIG. 3, an electric heater 3 for daytime electric power is provided in the hot water storage tank 1 above the electric heater 2 in addition to the electric heater 2 for midnight electric power provided in the lower portion of the hot water storage tank 1. A hot water storage type electric water heater has been proposed. The electric heater 2 is connected to a midnight power system 4 as shown in FIG. 4, 5 is a time switch provided in the midnight power system 4, 6 is an integrated watt hour meter, and 7 is a distribution line. A circuit breaker, 8 is an earth leakage circuit breaker, and 9 is a thermostat. The electric heater 3 is connected to the daytime power system 10, 11 is an integrated watt hour meter, 12 is a distribution line breaker, 13 is a daytime power selection switch, and 14 is a thermostat.

In the hot water storage type electric water heater of this configuration, when a hot water tap (not shown) connected to the hot water supply pipe 15 is opened, cold water flows from the water supply pipe 16 into the hot water storage tank 1 as shown by the arrow, and The hot water boiled by the electric heater 2 flows out from the hot water supply pipe 15. When it is desired to use additional hot water having a capacity larger than the hot water storage capacity, the daytime power selection switch 13 is turned on. Then, when the hot water falls below the set temperature, the thermostat 14 is closed, the electric heater 3 is supplied with electric power, the hot water is boiled, and the hot water exceeding the hot water storage capacity is compensated as an additional portion.

In addition, in FIG. 3, 17 is an electric water heater main body case, 18
Is a heat insulating material, and 19 is a current plate.

(Problems to be solved by the invention) However, in an electric water heater of a hot water storage type in which an electric heater 3 different from the electric heater 2 is provided in a hot water storage tank 1 above the electric heater 2 to boil hot water, Since the thermostat 14 will turn on when the amount of hot water remaining in the tank 1 becomes low, the amount of hot water to boil may not keep up with the amount of hot water used, and the hot water will run out. There is a problem that occurs. In order to avoid this, the electric heater 3 used for daytime electric power is provided in the lower portion of the hot water storage tank 1, and the electric heater 2 used for late night electric power is provided in the hot water storage tank 1 above the electric heater 3. However, with such a configuration, the hot water storage capacity during the midnight power hours will be reduced, and the amount of boiling water during the daytime power hours will increase accordingly, resulting in a low electricity rate. The advantage of storing hot water using late-night power is impaired.

In the first place, daytime electricity is used for a few days to several tens of days at most throughout the year because the electricity rate of daytime electricity is significantly higher than that of midnight electricity. Nevertheless, the hot water storage tank 1 is provided with the electric heater 2 and the electric heater 3, and the midnight power system 4 and the daytime power system 10 are provided.
It is not preferable to separately wire and from the viewpoint of practicality because it leads to an increase in construction cost.

(Purpose of the Invention) The present invention has been made in view of the above circumstances. The purpose of the present invention is to keep hot water in the daytime while keeping the advantage that hot water is boiled and stored using the midnight power hours. An object of the present invention is to provide a hot water storage type electric water heater that can provide additional hot water using the electric power time period without running out of hot water and can reduce the construction cost.

Configuration of the Invention (Means for Solving the Problems) The feature of the hot water storage type electric water heater according to the present invention is set by the time switch for supplying daytime electric power to an electric heater provided at the bottom of the hot water storage tank. A control circuit is provided for switching from the midnight power system to the daytime power system when it is out of time and preferentially supplying power through the midnight power system during the time set by the time switch. , The control circuit has a daytime power system selection switch for supplying electric power to the electric heater via the daytime power system, and the energization time through the daytime power system is adjusted. Where it is possible.

(Embodiment) An embodiment of a hot water storage type electric water heater according to the present invention will be described below with reference to the drawings.

In FIG. 1, 20 is an electric water heater body case, 21 is a heat insulating material, and 22 is a hot water storage tank. A water supply pipe 23 connected to a water pipe (not shown) is provided below the hot water storage tank 22, and a hot water supply pipe 24 connected to a hot water tap (not shown) is provided above the hot water storage tank 22. There is. The hot water storage tank 22 is provided with a current plate 25 facing the water supply port of the water supply pipe 23.

An electric heater 26 is provided below the hot water storage tank 1. Electric power is supplied to the electric heater 26 from either the late-night power system 28 or the daytime power system 29 under the control of a control circuit 27 described later.

The midnight power system 28 has a time switch 30, an integrated wattmeter 31, and a distribution line breaker 32, as shown in FIG. The daytime power system 29 has an integrating wattmeter 33 and a distribution line breaker 34.

The electric heater 26 is connected to the earth leakage breaker 36 via the thermostat 35.
It is connected to the. The thermostat 35 is an electric heater
The thermostat 35, which is provided above 26, is opened when the temperature of the hot water stored in the hot water storage tank 22 is equal to or higher than the set temperature, and is closed when the temperature is lower than the set temperature.

Two power supply lines 37, 38, 39, 40, 41, 42 are connected to the distribution line breaker 32, the distribution line breaker 34, and the earth leakage breaker 36, respectively. The power supply lines 37, 39 and the power supply line 41 are connected via a line 43, and the power supply lines 38, 40 and the power supply line 42 are connected via a line 44.
The power supply lines 37-42 are connected to fixed contacts 45-50. The lines 43 and 44 are connected to the movable contacts 51 and 52 and the fixed contacts 53 and 54.

A relay X ₁ is provided between the line 37 and the line 38. This relay X ₁ has a normally open contact X ₁ and movable contacts 51, 52. The lines 43 and 44 are connected to the primary side of a transformer 56 that forms a part of the control circuit 27. The secondary side of the transformer 56 is connected to the lines 57 and 58. Lines 59 to 62 are provided between the line 57 and the line 58. The line 59 is provided with a relay Y ₁ and a normally open contact X ₁ of the relay X ₁ .
The relay Y ₁ has a normally open contact Y ₁ and a normally closed contact ₁ . Time switch T ₁ is provided with normally closed contact Y ₁ in line 60. On line 61, a relay X ₂ is provided with a normally open contact Y ₁ . That relay X ₂ has a normally open contact X _2, function and line its normally open contact X ₂ is intermittently the line 43, 41 44, 42
Fulfill the function of intermittently.

A time switch T ₂ is provided in parallel with the time switch T ₁ between the line 60 and the line 58. The time switch T ₁ has a normally open time limit contact T ₁ . The time switch T ₂ has a normally closed time limit contact T ₂ . Its normally closed contact T ₂
Is provided on track 63. On the line 63, a relay Y ₂ is provided in series with the normally closed time limit contact T ₂ . The relay Y ₂ has normally open contacts Y ₂ , Y ₂ ′. The normally open contact Y ₂ is provided on the line 63. A self-resetting push button 64 as a daytime power selection switch is provided in parallel with the normally open contact Y ₂ . A self-resetting push button 63 is provided between the normally closed time limit contact T ₂ and the normally open contact Y ₂ .

The line 62 has a normally open contact Y ₂ , a normally open time limit contact T ₁ , and a relay Y ₃
Is provided. The relay Y ₃ has a normally open contact Y ₃ . The normally open contact Y ₃ is connected in parallel with the normally open contact Y ₁ .

The time switch 30 turns on at midnight power hours,
It is kept on for a certain period of time, and is set to turn on at 11 pm and turn off at 7 am, for example. Those time switch 30 is energized to turn on to the coil of the relay X _1, when the coil of the relay X ₁ is energized, the normally open contact X ₁ is closed, also the movable contact 51 and the fixed contact 48 The connection state of (4) is switched to the connection state of the fixed contact 46, and the movable contact 52 is switched from the connection state of the fixed contact 47 to the connection state of the fixed contact 45.

When the movable contacts 51 and 52 are connected to the fixed contacts 46 and 45,
Electric power is supplied to the primary side of the transformer 56 via the midnight power system 28. Then, since the normally open contact X ₁ of the relay X ₁ is closed, the power generated in the secondary side coil of the relay Y ₁ becomes energized, the normally open contact Y ₁ is closed. At the same time, the normally open contact Y ₁ is opened. When the normally open contact Y ₁ is closed, the coil of the relay X ₂ is energized and the normally open contact X ₂ is closed. Therefore, when the time switch 30 is turned on, when the thermostat 35 is in the closed state, electric power is supplied to the electric heater 26 via the midnight power system 28, and the electric heater 26 is boiled using the midnight power time zone. The hot water will be stored in the hot water storage tank 22. The thermostat 35 opens when the temperature of the hot water reaches or exceeds the set temperature (for example, 80 degrees or more).

When the time switch 30 is turned off after a predetermined time has passed,
The coil of the relay X ₁ becomes non-energized. Then, the normally open contact X ₁ is opened and the movable contacts 51, 52 are connected to the fixed contacts 47, 48, whereby the coil of the relay Y ₁ is de-energized and the normally open contact Y ₁ is opened. And
The normally closed contact Y ₁ is closed. When the normally open contact Y ₁ is opened, the coil of the relay X ₂ is de-energized, the normally open contact X ₂ is opened, and the electric heater 2 through the midnight power system 28 is opened.
Power supply to 6 becomes impossible.

The time switches T ₁ and T ₂ are turned on when the normally closed contact Y ₁ is closed. Here, the time switch T ₁ is set so as to close the normally open time limit contact T ₁ 6 hours after the closing of the normally closed contact Y ₁ , and the time switch T ₂ is set to the normally closed contact. It is set so that the normally closed time limit contact T ₂ is opened 10 hours after the closing of Y ₁ .
When the normally-closed contact Y ₁ is closed and the self-resetting push button 64 is pressed to close it, the electric power generated on the secondary side of the transformer 56 causes the relay Y _{2 to} be energized. When the relay Y ₂ is energized, the normally open contacts Y ₂ , Y ₂ ′ are closed. The relay Y ₂ is self-held because its normally open contact Y ₂ is closed.

Six hours after the normally closed contact Y ₁ is closed, the time switch T ₁ closes the normally open time limit contact T ₁ . When the normally open time limit contact T ₁ is closed, the normally open contact Y ₂ ′ is closed, so the coil of the relay Y ₃ is energized and the normally open contact Y ₃ is closed. The coil of the relay X ₂ is energized, the normally open contact X ₂ is closed, and power can be supplied to the electric heater 26 via the daytime power system 29.

In this case, when hot water is used, cold water equivalent to the used hot water is supplied from the water supply pipe 23 into the hot water storage tank 1,
When the temperature of the hot water falls below the set temperature, the thermostat 35 is closed, and the hot water used is boiled using the daytime power hours.

When 10 hours have passed from the time of closing the normally open contact Y _1, the normally closed time limit contact T ₂ is opened by the time switch T ₂ . When the normal閉限during contact T ₂ is opened, the coil of the relay Y ₂ is a non-energized state, the normally open contact Y _2, Y ₂ 'is opened. By opening the normally open contact Y ₂ , the self-holding of the relay Y ₂ is released. Further, since the normally open contact Y ₂ ′ of the coil of the relay Y ₃ is also opened, the non-energized state is established and the normally open contact Y ₃ is opened. Then, the coil of the relay X ₂ is de-energized, the normally open contact X ₂ is opened, and the electric power cannot be supplied to the electric heater 26 via the daytime electric power system 29.

Therefore, in this embodiment, the hot water used by 17:00 is additionally boiled by the daytime power, and from 17:00 to 23:00.
The hot water used up to that time is being boiled by using late-night power.

It should be noted that the electric heater forcibly using the daytime power hours
When it is desired to cancel the power supply to 26, the self-resetting push button 65 is pressed to cancel the self-holding of the relay Y ₂ .

As described above, in the embodiment, the control circuit 27 is configured by using the relay, but the control circuit 27 may be configured by using the electronic circuit. Further, in the embodiment, the time switches T ₁ and T ₂ are reset every day from the viewpoint of preventing the power charge from unexpectedly increasing by using daytime power having a high power charge. An electronic circuit can be used to make a reservation system for a plurality of days. Further, the time switches T ₁ and T ₂ can be set so as to avoid the peak time of daytime power demand. In addition, the amount of additional hot water can be adjusted by changing the set time of the time switches T ₁ and T ₂ .

Effect of the Invention As described above, the hot water storage type electric water heater according to the present invention switches from the midnight power system to the daytime power system when the time set by the time switch is outside and the time switch. The control circuit that preferentially supplies electric power through the midnight power system during the time set by the control circuit, and this control circuit is used during the daytime for supplying electric power to the electric heater through the daytime power system. Since it has a time switch for power system selection, power is preferentially supplied through the midnight power system during the midnight power time zone regardless of whether the time switch for daytime power system selection is operated. Therefore, it is possible to avoid non-economicity due to forgetting to switch, and it is economical.

In addition, since the control circuit according to the present invention can adjust the energization time through the daytime power system, it is possible to operate various home electric appliances such as air conditioners and electric rice cookers at the peak of daytime power demand. There is also an effect that the hot water storage type electric water heater can be operated while avoiding peak hours.

Further, since the hot water storage electric water heater according to the present invention can be configured so that the control circuit can be externally attached, it is possible to control the hot water storage electric water heater that is configured to boil hot water only by using the existing midnight power hours later. There is also an effect that a hot water storage type electric water heater according to the present invention can be configured by attaching a circuit.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a schematic structure of an electric water heater according to the present invention, FIG. 2 is a circuit diagram showing a wiring system of the electric water heater according to the present invention, and FIG. 3 is an electric water heater according to a prior art. FIG. 4 is a sectional view showing a schematic configuration, and FIG. 4 is a circuit diagram showing a wiring system of an electric water heater according to the prior art. 22 …… Hot water tank 26 …… Electric heater 27 …… Control circuit 28 …… Midnight power system 29 …… Daytime power system 64 …… Self-resetting pushbutton (Daytime power selection switch)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Bibliography Shou 63-55051 (JP, U) Sumi 43-17267 (JP, Y1)

Claims (1)

[Scope of utility model registration request] 1. A hot water storage tank in which cold water flows in from a lower part and hot water stored by being boiled from an upper part flows out,
In a hot water storage type electric water heater provided with an electric heater at a lower portion of the hot water storage tank, the electric heater being supplied with electric power through the midnight power system during a time set by a time switch of the midnight power system. A daytime power system for supplying to an electric heater is provided, and when the time set by the time switch is outside, the midnight power system is switched to the daytime power system and set by the time switch. A control circuit for supplying electric power preferentially through the midnight electric power system during time is provided, and the control circuit is for daytime electric power for supplying electric power to the electric heater through the daytime electric power system. A hot water storage type electric water heater having a system selection switch and capable of adjusting energization time through the daytime power system.