JPS6157975B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hot water supply control device suitable for a hot water supply device that heats water to be heated in a water heater using a heater that uses electricity late at night to supply hot water.

In conventional water heaters of this type, a heater is installed at the bottom of the water heater to heat the entire water to be heated, and power is supplied to the heater during the late-night power-on period (22:00 to 6:00) to heat the water by early morning. The entire water is heated to around 85 degrees Celsius in preparation for the next day's bathing. By the way, city water is supplied to the water heater for the amount of hot water used, and when there is little hot water left, the temperature of the upper layer of the water to be heated has dropped considerably, so late night electricity is used. Even when the heater is energized, it takes several hours or more until high-temperature water can be dispensed, and it has drawbacks such as unexpected access to hot water in the middle of the night and the inability to reheat the bathtub. In addition, in recent years, solar water heaters are often used in combination with water heaters, and in summer, when a large amount of hot water is obtained from a solar water heater, or when the city water temperature is high, it is necessary to minimize the energization of the heater. , it was desired to be able to save electricity.

The present invention has been made in view of the above-mentioned facts, and it is possible to maintain the upper layer of the heated water in the water heater at a high temperature during late-night power hours, regardless of the amount of hot water used on the previous day, thereby preventing unexpected hot water from being released. To provide a hot water supply control device capable of saving power by selecting a hot water temperature in accordance with the city water temperature which changes depending on the season while preparing for reheating a bathtub.

Hereinafter, one embodiment of the present invention will be described based on the drawings. In FIG. 1, 1 is a water heater, 2 and 3 are a main heater and an auxiliary heater, which are housed in the water heater 1 and heat the water to be heated 4 using late-night electricity, respectively. is attached to the lower part of the side wall so as to heat the entire heated water 4 in the water heater 1, and the auxiliary heater 3 is attached to the upper layer 4' of the heated water 4 in the water heater 1.
It is mounted above the side wall so that it only heats the area. A water supply pipe 5 is connected to the lower part of the water heater 1 and supplies city water to a lower tank 6 in the water heater 1, and a pressure reducing check valve 7 is interposed therein. Reference numeral 8 denotes a hot water outlet pipe connected to the upper end of the water heater 1 and communicated with the upper part 4' within the water heater 1. The hot water pipe 8 is provided with a mixing valve 9 that mixes the hot water from the water heater 1 with city water and adjusts the temperature to hot water at a constant temperature (42 to 44° C.). Karan 1, which supplies hot water to
1 and 12 are connected. Reference numeral 13 denotes a heat exchanger 14 installed in the upper layer 4' of the water heater 1 and the bathtub 10.
It is a circulation circuit that connects the outgoing pipe 16 which is branched from the outlet pipe 8 and connected to one end of the heat exchanger 14, and in which the circulation pump 15 is interposed, the other end of the heat exchanger 14, and the water heater 1. A return pipe 17 is provided which connects the lower part of the upper layer part 4'. 18 is a solar heat collector, which includes the lower part 6 of the water heater 1 and the circulation pump 19.
They are connected through a circulation circuit 20 with an intervening circuit.

21 is a control device for the main heater 2 and the auxiliary heater 3, and as shown in FIG. A circuit breaker 24, a thermo switch 25 and a safety thermo switch 26 mounted above the side wall to sense the temperature of the upper layer 4' of the water to be heated 4, and a safety thermo switch 26 to sense the temperature of the lower part of the water to be heated 4. A high-temperature side thermoswitch 27, a low-temperature side thermoswitch 28, a safety thermoswitch 29, a relay 30, and a relay 30 installed on the lower side wall.
relay switch 301, auxiliary heater control relay 31, main heater control relay 32, and relay switches 311, 311, 3 of both relays 31, 32.
21, 321 and two changeover switches 33, 3
3' and are connected as shown.
Furthermore, the thermo switch 25 and the high temperature side thermo switch 27 are turned on at 75°C or lower and turned off at 85°C or higher, and the low temperature side thermoswitch 28 is turned on at 50°C or lower and turned off at 65°C or higher, and the safety thermoswitches 26 and 29 turns on at temperatures above 92°C.

To explain the operation of this device, first, when the city water temperature is high and high temperature water can be obtained from the solar heat collector 1, such as in summer, the changeover switches 33 and 33' are turned to the A position. In this way, relay 3
0 is no longer energized and the relay switch 301 enters the normally closed side b, so the main heater control relay 32 is connected between the busbars 22 and 23 via the two thermoswitches 27 and 28, and the auxiliary heater control Relay 31 is no longer energized. Therefore bus line 2
When power is supplied late at night between 2 and 23, the main heater control relay 32 is substantially energized by the low-temperature side thermoswitch 28, which has a low set temperature, and the main heater 2 heats the water heater 1. Heating water temperature is 65
It can be raised up to ゜. Of course, solar heat collector 1 during the day
If sufficient heat collection is performed at step 8, the time for energizing the main heater 2 is short, and late-night power is saved. In the summer, the city water temperature is high and the amount of hot water used is small, so even if the boiling temperature of water heater 1 is kept low, it is possible to supply hot water at a constant temperature from Karan 11 and 12, which saves electrical energy. I can figure it out.

Next, when switching the changeover switches 33 and 33' to the low position, the relay 30 is connected to the busbars 22 and 23 via the thermo switch 25, and the main heater control relay 32 is connected to the high temperature side thermo switch 27 and the low temperature side thermo switch 28. It is connected to busbars 22 and 23 via. Therefore, when power is supplied late at night and the temperature of the upper layer 4' of the water to be heated 4 in the water heater 1 is lower than 75 DEG C., the thermoswitch 25 is closed and the relay 30 is energized. For this reason,
The relay switch 301 is switched to the normally open side a, the auxiliary heater control relay 31 is energized, and the auxiliary heater 3
is powered. Since the auxiliary heater 3 heats only the upper layer 4' of the water to be heated 4, the upper layer 4' boils up to 85° C. in a short time (within 30 minutes). When the thermo switch 25 is turned off, the relay 30 is de-energized, and the main heater control relay 32 is then energized via the normally closed side b of the relay switch 301, the high-temperature side thermoswitch 27, and the low-temperature side thermoswitch 28. , power is supplied to the main heater 2, and the heated water 4 is heated until the temperature sensed by the low temperature side thermoswitch 28 reaches 65°C. Of course, if the thermo switch 25 is turned on while power is being supplied to the main heater 2, the relay 30
is energized, and the auxiliary heater 3 replaces the main heater 2.
The temperature of the upper layer 4' of water heater 1 is 75℃.
and 85°C. In this way,
Even when it is necessary to reheat the bathtub 10 during the night, the hot water in the bathtub 10 can be heated by guiding the high temperature water in the upper layer 4' of the water heater 1 to the heat exchanger 14 using the circulation circuit 13. The upper tank part 4' is connected to the auxiliary heater 3.
Since the water heater 1 is heated to a high temperature with priority over other parts, it can be used even when there is only a small amount of hot water left in the water heater 1 and a large amount of hot water needs to be dispensed at night. In addition, most of the water to be heated 4 is maintained at a low temperature (50°C to 65°C),
As with the A position, power can be saved.

When the changeover switches 33 and 33' are turned on to the C position, the power supply to the auxiliary heater 3 is controlled by the thermo switch 25 as in the B position, but the main heater 2 is controlled by the low temperature side thermoswitch 28 and the changeover switch 33'.
The high temperature side thermo switch 27 is short-circuited at
The power supply is controlled by In this case as well, the auxiliary heater 3
is given priority over the main heater 2, and the water to be heated 4
The upper part 4' of the bathtub 10 is quickly maintained at high temperature water (75° C. to 85° C.), and the bathtub 10 can be reheated at any time during the night. In addition, the auxiliary heater 3 is energized for a very short time, and during most of the late-night energization hours, power is supplied to the main heater 2, and the water to be heated 4 is boiled up to 85°C. Suitable when a large amount of high-temperature water is required and the city water temperature is low.

In addition, the safety thermo switches 26 and 29 are unable to turn off the heaters 2 and 3 due to a circuit failure.
If the hot water temperature rises abnormally, the earth leakage circuit breaker 24
The earth leakage circuit breaker 24 detects the apparent earth leakage current.
can be activated to turn off the electricity to the heaters 2 and 3. Furthermore, since the main heater 2 and the auxiliary heater 3 are not energized at the same time, the contracted power is only needed for one heater, which is economical.

As described above, the present invention supplies power to the main heater in the water heater that uses late-night electricity to heat the entire water to be heated, and the main heater that uses late-night electricity to heat only the upper layer of the water to be heated. , a means for adjusting the temperature of the entire water to be heated to a low water temperature, a means for supplying power to either of the two heaters with priority given to the auxiliary heater, and a means for controlling the temperature of the entire water to be heated to a high water temperature; A device selectively equipped with means for supplying power to either of the two heaters preferentially to adjust the temperature of only the upper layer of the water to be heated to a high temperature and the other portion of the water to be heated to a low temperature. Therefore, it is possible to supply hot water at a temperature suitable for the city water temperature throughout the year, and in the summer, it is possible to supply relatively low-temperature hot water to save electricity late at night, and solar heat collectors can be installed. The connected equipment will make effective use of solar heat, and will be able to supply high-temperature hot water in the winter to meet the large demand for hot water.
This system is designed to deal with reheating the bathtub at night and unexpected hot water. Moreover, since power is not supplied to both heaters at the same time, and the main heater and auxiliary heater are automatically switched and used, power consumption can always be kept below a certain amount, and there is no need to increase the power contract amount. It is also economical.

[Brief explanation of the drawing]

FIG. 1 is a system diagram showing an example of a hot water supply device to which the present invention can be applied, and FIG. 2 is an electric circuit diagram of a hot water supply control device showing an embodiment of the present invention. 1... Water heater, 2... Main heater, 3... Auxiliary heater, 4... Water to be heated, 4'... Upper layer, 21...
…Control device.

Claims (1)

[Claims] 1 The water heater is equipped with a main heater that uses late-night electricity to heat the entire water to be heated, and an auxiliary heater that uses late-night electricity to heat only the upper layer of the water to be heated, and supplies power to the main heater. , a means for adjusting the temperature of the entire water to be heated to a low water temperature, a means for supplying power to either of the two heaters with priority given to the auxiliary heater, and a means for controlling the temperature of the entire water to be heated to a high water temperature; Priority is given to powering one of the two heaters,
A hot water supply control device characterized by selectively comprising a means for controlling only the upper layer of the water to be heated to a high temperature and the other portion of the water to be heated to a low temperature.