JP2589869B2 - Electric water heater - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric water heater for supplying water to a water heater main body, heating and storing the main body with an electric heater, and supplying hot water to the outside as needed.

[Conventional technology]

A conventional electric water heater that supplies water to the water heater body, heats it with an electric heater, stores the water, and supplies hot water to the outside at any time. Hot water can be used at any time.

[Problems to be solved by the invention]

However, in the conventional electric water heater, even if the daytime usage exceeds the hot water storage capacity and the hot water runs out, it is not possible to perform additional boiling by daytime electric power, and the supplied water is supplied from the main body of the water heater. Alternatively, the supply of hot water from the water heater body is stopped by the control device.

For this reason, a large-sized electric water heater having a capacity sufficient for the amount of hot water used in the daytime is required, and there is a problem in securing an installation space. Alternatively, there is a problem that the amount of hot water used is limited.

The present invention has been made in order to solve the above-mentioned problems of the prior art, and it is not necessary to store the entire amount of hot water used during the daytime, and it is easy to secure an installation space, and there is little restriction on the amount of hot water used. SUMMARY OF THE INVENTION It is an object of the present invention to provide an electric water heater that can be controlled so as to have a relatively low power rate.

[Means for solving the problem]

For this reason, the electric water heater according to the present invention is provided with a water heater main body that supplies hot water to the outside by heating and storing feed water by an electric heating means, and a sensor for detecting a temperature of the hot water in the water heater main body. When the sensor detects a hot water temperature lower than a set heating start temperature, a control unit that supplies power to the electric heating unit to increase the temperature of the hot water in the water heater body to a preset boiling temperature; and the electric heating unit. An electric water heater having a power receiving facility capable of supplying both nighttime power and daytime power to the electric water heater, wherein the control means heats hot water in the water heater body by nighttime power at night to maintain the boiling temperature, During the daytime power time, when the sensor detects that the water temperature in the water heater body has dropped below the set heating start temperature by the sensor, the hot water in the water heater body is heated to the preset boiling temperature by daytime power. An electric water heater controlled to be capable of supplying hot water by heating, wherein a set heating start temperature at which heating of hot water in the water heater body is started by daytime power is lower than a set heating start temperature at which heating is started by nighttime power. The above object is achieved by a configuration characterized by the following.

Further, in the above configuration, the above-described object is achieved by setting the set heating start temperature by daytime power lower than a temperature reached by natural cooling.

(Operation)

With the above configuration, the water supply in the water heater main body is heated and the temperature is increased and stored, and when necessary, the hot water can be supplied to the outside.

In the nighttime, the hot water in the water heater body is heated by the nighttime electric power to maintain the boiling temperature at all times and hot water can be supplied, and the hot water in the water heater body is heated by the use of the hot water in the daytime power time. When the temperature falls below the starting temperature, the hot water in the water heater main body is heated to the boiling temperature by daytime electric power and stored therein, so that hot water can be supplied.

Furthermore, when the set heating start temperature at which the hot water in the water heater body is started to be heated by daytime power is lower than the set heating start temperature at which heating is started by nighttime power, use of relatively expensive daytime power is required. Can save money.

〔Example〕

Hereinafter, a hot water supply system according to the present invention will be described with reference to embodiments.

FIG. 1 is a main block diagram showing the configuration of an embodiment of the present invention. The configuration and operation of the embodiment will be described together with reference to FIG.

The water heater main body 1 is composed of a first water heater main body 1a and a second water heater main body 1b, and tap water is taken in from a water tap 2 to supply water downward inside the first water heater main body 1a. First water heater body 1a
When the water is full, water is supplied from the upper part of the first water heater main body 1a to the lower part of the second water heater main body 1b.
1b is also full.

Electric power is supplied to electric heaters 3a and 3b, which are attached to relatively lower portions of the first and second water heater main bodies 1a and 1b, to heat the water supply in the water heater main bodies 1a and 1b.
Boil to 8 ° C or 65 ° C and store inside the water heater main body 1a, 1b.

Hot water to the outside is taken out from the upper part of the second water heater main body 1b, and tap water of the amount of the hot water taken out is automatically fed from the water tap 2 into the water heater main bodies 1a, 1b as described above. It is always filled with water.

Above the water heater main body 1a, 1b, sensors 4a, 4b for detecting remaining hot water
Is attached, so that the temperature of the hot water relatively high in the water heater main body can be detected. Water heater body 1a, 1
At the bottom of b, sensors 5a and 5b for temperature control are attached,
The temperature of the hot water relatively lower in the water heater main body can be detected.

As the hot water supply line to the outside, a high-temperature hot water line 6 for directly supplying high-temperature hot water boiled in the water heater main body 1 is provided from the second water heater main body 1b to a required location. An automatic hot water supply line 13 for supplying hot water at a constant temperature of, for example, 42 ° C. to a hot water tank 7 such as a bath, instead of directly supplying high-temperature hot water boiled in the water heater body 1, is provided. A mixing valve 8 having a variable mixing ratio for mixing high-temperature hot water and tap water from the water tap 2 to obtain a predetermined temperature of hot water is provided. The mixed hot water is supplied to a cistern 10 via an electric valve 9.
Once accepted. The cistern 10 is necessary for preventing backflow of mixed hot water to the water heater main body side and the like, and is provided with a plurality of sensors 14 for detecting an internal water level.

Then, from the cistern 10, the water is pumped by the hot water supply pump 11 and the automatic hot water supply line is passed through the flow control valve 12 with a variable opening.
13 allows hot water to be supplied to the hot water tank 7 and the like.

The hot water tank 7 is provided with a sensor 14 for detecting the level of hot water and the temperature of the hot water in the tank.

The control device 15 sets the boiling temperature of the water supply in the water heater main body 1, the temperature of the hot water in the hot water tank 7 supplied from the automatic hot water supply line 13 and the same amount of hot water supply, and the various valves and valves, pumps, electric heaters and the like. And the like, and execution and output of a display signal. And the control device 15
In addition to the setting operation and display performed by the main operation remote control device 16 of the above, an on-site remote control device 17 capable of performing a setting operation from a place receiving hot water such as a bathroom is attached. Reference numeral 18 denotes a control board of the control device 15, which incorporates an arithmetic processing unit (CPU) and a storage device.

A 200V commercial power supply is drawn in as a power supply facility for the electric heaters 3a and 3b, and is connected via a timer 19 and an integrating wattmeter 20 to turn on and off while measuring time under the control of the controller 15. Is done.

A 100 V power supply is connected to the control device 15 for control. A signal transmission path 2 is provided between each sensor / operation control unit and the remote control devices 16 and 17 and the control device 15.
1 is connected to transmit a control electric signal or optical signal or the like.

With the above configuration, the main operation remote control device
The hot water temperature in the water heater body 1, the temperature of the hot water to be supplied to the hot water tank 7, and the amount of hot water are set by the on-site remote control device 16 or the on-site remote control device 17, and the control device 15 controls the set values and the information from the sensors related thereto. Then, automatic control is performed to supply desired hot water.

The control device 15, the electric heaters 3a, 3b, the sensors 4a, 4b, 5
The control means for raising the hot water in the water heater main body to the set heating temperature is formed by a and 5b.

 Next, the characteristic control of this embodiment will be described.

The control device 15 detects the amount and temperature of hot water stored in the water heater main body 1 by sensors 4a, 4b, 5a, 5b in the water heater main bodies 1a, 1b, and controls on / off of the electric heaters 3a, 3b. I do.

Then, in order to make use of the cheap electricity at midnight as much as possible and to reduce the boiling during the day, first, set the temperature to start the boiling at midnight electricity rate time zone (hereinafter referred to as night), for example, 85 ° C, and then the boiling In a time zone other than at night (hereinafter, referred to as daytime), a set temperature at which reheating is started is set to, for example, 50 ° C.
Then, the temperature at which the reheating is completed is set to, for example, 88 ° C. Note that the set temperature at which the above-mentioned reheating is started
85 ° C is an example of a temperature that is lowered by natural cooling at night, and 50 ° C during the day is a temperature that can be used as hot water and cannot be reached by natural cooling.

The determination of the plurality of sensors 4a, 4b, 5a, and 5b and the set temperature and the combination thereof are determined based on the storage capacity of the hot water, the expected use amount of the hot water, the time zone, the temperature of the used hot water, and the like.

Next, the above control will be described with reference to the flowchart of FIG.

First, if it is nighttime power time in step S1, the process proceeds to step S2.If the sensor detects a temperature equal to or lower than the heating start temperature in the nighttime, the process proceeds to step S3 to turn on the electric heater and turn on the hot water. The heating of the hot water in the vessel body 1 is started. Then, when the hot water temperature rises to the nighttime heating end temperature in step S4, the process proceeds to step S5, where the electric heater is turned off, and returns to step S1.

If it is not the nighttime power time in step S1, the process proceeds to step S6, and if permission for daytime reheating is set, the process proceeds to step S7.
If the temperature has dropped to the nighttime boiling start temperature, the process proceeds to step S8, where the electric heater is turned on to start heating the hot water in the water heater main body 1. When the hot water temperature rises to the daytime heating end temperature in step S9, the process proceeds to step S10, where the electric heater is turned off, and the process returns to step S1.

In addition, when the nighttime heating start temperature has not been reached in Step S2, the daytime heating start temperature has not been reached in Step S7, and when the permission of daytime boiling is not set in Step S6, the process returns to Step S1. .

According to the above control, the hot water supply system of this embodiment can perform normal hot water supply control and also perform hot water supply during the daytime. By setting the start temperature of reboiler low during the daytime and high at nighttime, hot water can be supplied while suppressing the use of expensive electric power in the daytime.

〔The invention's effect〕

As described above, according to the present invention, in the nighttime power hours, since the electricity bill is cheap, the hot water in the tank is kept at a high temperature, for example, the hot water has a preset boiling temperature of 88 ° C. By setting the heating start temperature at which the heating is started to 85 ° C., the hot water is kept at a high temperature. When natural cooling or hot water is used, the temperature in the tank decreases and the heating starts as soon as the set heating start temperature is reached, so the hot water is hot, for example, 85 ° C.
By maintaining the above, high-temperature hot water used in the daytime can be secured, and the maximum amount of daytime usage can be obtained. In the case of normal use, a sufficient hot water temperature can be obtained as the daytime usage.

In the daytime power time, the set heating start temperature at which heating is started is set to, for example, 50 ° C. in order to lower the temperature at night, and the time to reach the temperature is almost determined by the amount used during the day.

That is, the amount of hot water used is supplied to the tank and cooled. For example, if the temperature of hot water reaches 50 ℃, repeat
Heat to 85 ° C.

However, this is not always the case and special hot water is needed, usually the amount heated at night is sufficient. Moreover, for example, hot water at 50 ° C. is not used at 50 ° C., but is likely to be buried and used. That is, heating is set as little as possible in the daytime, and expensive daytime electric power is not used, which is economical. In addition to performing normal hot water supply control,
Even in the daytime, the water can be reheated to supply hot water, eliminating the need to store hot water for the entire amount of hot water used during the day. In addition, by setting the set heating start temperature at which the heating is started to be lower than the temperature reached by natural cooling, boiling is not required during the daytime, at least when hot water is not used during the daytime, which is economical.

[Brief description of the drawings]

FIG. 1 is a main block diagram showing the configuration of one embodiment of the present invention, and FIG. 2 is a flowchart showing characteristic control of the above embodiment. 1, (1a, 1b) ... water heater body 2 ... water tap 3a, 3b ... electric heaters 4a, 4b ... sensors for remaining hot water detection 5a, 5b ... sensors for temperature control 6 ... high temperature hot water Line 7 hot water tank 8 mixing valve 9 electric valve 10 cistern 11 hot water supply pump 12 flow control valve 13 automatic hot water supply line 14 sensor 15 control device 16 Operation remote control device 17 Remote control device on site 18 Control board 19 Timing device (power receiving equipment) 20 Integrated power meter (power receiving equipment) 21 Signal transmission path

Claims (2)

(57) [Claims] 1. A water heater main body for heating and storing feed water by an electric heating means and supplying hot water to the outside, a sensor for detecting a temperature of the hot water in the water heater main body, and a hot water lower than a set set heating start temperature. When the temperature is detected by the sensor, control means for supplying power to the electric heating means to raise the temperature of the hot water in the water heater main body to a preset boiling temperature, and both nighttime power and daytime power to the electric heating means Power supply equipment capable of supplying water, and heating the hot water in the water heater main body at the night power time by the electric heating means to maintain the boiling temperature, and the water temperature in the water heater main body by the sensor in the daytime power time. An electric water heater that controls the hot water in the water heater main body to the preset boiling temperature by daytime electric power when it detects that the temperature has dropped below the set heating start temperature. Set the heating start temperature for the start of heating the hot water in the water heater main body by the daytime power electric water heater, characterized in that the nighttime power is at a temperature lower than the set heating start temperature to start heating. 2. The set heating start temperature by daytime electric power is as follows:
The electric water heater according to claim 1, wherein the temperature is lower than a temperature reached by natural cooling.