JP2713090B2 - Hot water storage type 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 a hot water storage type electric water heater in which a heater is separated from a hot water tank and hot water is stored from above the hot water tank.

[0002]

2. Description of the Related Art Conventionally, this type of hot water storage type electric water heater is shown in FIG.
As shown in FIG. 1, a hot water tank 1, a circulation pump 2, a heater 3, a first temperature detector 5 provided upstream of the heater 3, a second temperature detector 6 provided downstream of the heater 3, and the circulation Pump 2
Alternatively, it comprises a control unit 20 for controlling the input of the heater 3. Then, hot water heated to a predetermined temperature by controlling the flow rate of the circulation pump 2 or the input of the heater 3 is gradually stored from the upper part of the hot water storage tank 1 and the first temperature detector At the signal of 5, the heating operation is stopped.

[0003]

However, in the above-described conventional configuration, (1) hot water is always stored in the entire hot water storage tank. On the other hand, only about half of the hot water storage tank is used on days when the hot water supply is little or in summer or the like. Therefore, heat loss from the hot water storage tank increases, which is a problem from the viewpoint of energy saving.

(2) Further, it is not possible to detect the amount of remaining hot water in the hot water storage tank and reheat only the required amount of hot water.

A first object of the present invention is to solve the above-mentioned problems, and a second object is to heat the required amount of hot water to reduce energy loss and to know the remaining amount of hot water and reheat only the required amount of hot water. Is what you do.

[0006]

In order to achieve the above object, the present invention provides: (1) a hot water supply circuit in which a hot water storage tank, a circulation pump, and a heater with a built-in heater are sequentially connected, and a hot water supply circuit provided upstream of the heater. 1
Temperature detecting means, second temperature detecting means provided downstream of the heater, hot water quantity detecting means for detecting the hot water quantity in the hot water storage tank, hot water quantity setting means for presetting the hot water quantity to be stored in the hot water storage tank, 1 temperature detecting means, the second temperature detecting means,
Calculating a heating circulation flow rate from the input of the heater, calculating a heating hot water flow rate, integrating the calculated heating circulation flow rate, and controlling the heating hot water flow rate calculating section with a signal from the hot water flow rate detecting means; The control unit controls the circulation pump and the heater based on a signal from the hot water amount calculation unit.

(2) A hot water supply circuit in which a hot water storage tank, a circulation pump, and a heater with a built-in heater are sequentially connected, a first temperature detecting means provided upstream of the heater, and a second temperature detection means provided downstream of the heater. Temperature detecting means, hot water quantity detecting means for detecting the hot water quantity of the hot water storage tank, hot water quantity setting means for presetting the hot water quantity to be stored in the hot water storage tank, and water supply amount detecting means provided in a water supply pipe or tapping pipe of the hot water storage tank; A tapping amount calculating unit for integrating a water supply amount based on a signal from the water supply amount detecting unit; and a heating flow rate for calculating a heating flow rate from inputs of the first temperature detecting unit, the second temperature detecting unit, and the heater, and integrating the heating flow amount. A flow rate calculating unit, and controlling the hot water amount calculating unit and the heating flow rate calculating unit with a signal from the hot water amount detecting means,
It comprises a control unit for controlling the circulation pump and the heater based on signals from the hot water amount detecting means, the heating flow rate calculating unit, and the hot water amount calculating unit.

[0008]

According to the present invention, when the hot water is stored up to the position of the hot water amount detecting means in which the hot water amount is previously defined, a signal is sent to the heated hot water amount calculating section, and the first hot water amount is calculated.
From the inputs of the temperature detecting means, the second temperature detecting means, and the heater, the heating flow rate and its integration are calculated. Then, the amount of hot water to be heated is calculated from the signal of the hot water amount setting means and the signal of the hot water amount detecting means, and the operation is performed until the calculated result becomes the same as the calculation result of the hot water amount calculating section.

(2) When hot water is discharged from the hot water tank during the boiling operation, low-temperature water is supplied from the lower part of the hot water tank. Then, when the hot water is discharged to the position of the hot water amount detecting means in which the hot water amount is known in advance, the hot water supply amount calculating unit for integrating the water supply amount by the water supply amount detecting means calculates. At the same time, the amount of hot water is calculated by the hot water amount calculation unit from the inputs of the first temperature detecting means, the second temperature detecting means, and the heater. Then, the current hot water storage amount (remaining hot water amount) can be determined from the input of the hot water amount detection means, the hot water amount calculation result, and the heating water amount calculation result.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS.

1 is a hot water storage tank, 2 is a circulation pump, 3 is a heater, and has a heater 4 built therein. The lower part of the hot water tank 1, the circulating pump 2, the heater 3, and the upper part of the hot water tank 1 are sequentially connected to form a hot water supply circuit. 5
Is a first temperature detecting means for detecting an upstream temperature of the heater 3. 6 is a second temperature detecting means,
The downstream temperature of the Numeral 7 is a pump flow rate control means, which controls the flow rate of the circulating pump 2 by a signal of the second temperature detector 6. Reference numeral 8 denotes hot water amount detection means, which is provided in the hot water storage tank 1, and the hot water storage amount at that position is known in advance. 9 is a hot water amount setting means, 10 is a heating water amount calculating unit,
Activated by the signal from the hot water amount detecting means 8, the heating circulating flow rate is calculated from the input of the heater 4, the first temperature detector 5 and the second temperature detector 6, and integrated. Reference numeral 11 denotes a control unit which controls the heating water amount calculating unit 10 based on the signal of the water amount detecting unit 8 and calculates the water amount detecting unit 8, the water amount setting unit 9 and the calculation result of the heating water amount calculating unit 10. The circulation pump 2 and the heater 4
Control the operation of Reference numeral 12 denotes a water supply amount detecting means, which is provided in the water supply pipe 13 or the tapping pipe 14 of the hot water storage tank 1. Reference numeral 15 denotes a hot water supply amount calculation unit which receives a signal from the water supply amount detection means 12 and integrates the flow rate.

In the above configuration, the low-temperature water flowing out of the lower part of the hot water storage tank 1 is sent to the heater 3 by the operation of the circulation pump 2 and is heated by the heater 4. Then, the temperature of the heated hot water is detected by the second temperature detecting means 6 and a signal thereof is sent to the pump flow rate control means 7 so that the flow rate of the circulating pump 2 becomes constant at the outlet hot temperature of the heater 3. Control. Then, hot water of a predetermined temperature is stored from above the hot water storage tank 1. The required amount of hot water is stored in the upper part of the hot water storage tank 1 while continuing this operation. At this time, when the hot water is stored up to the position of the hot water amount detecting means 8, a signal is sent to the hot water amount calculating unit 10. Then, from the input of the heater 4 and the inputs of the first temperature detecting means 5 and the second temperature detecting means 6, calculation and integration of the heating circulation flow rate are started, and the amount of hot water is calculated. Thereafter, the heating water amount calculating section 10 repeats the integration until there is no difference between the setting value of the water amount setting means 9 and the water amount whose water amount is previously defined by the signal of the water amount detecting means 8. Then, when the set value is reached, a signal is sent to the control unit 11, and the operation of the circulation pump 2 and the heater 4 is stopped from the control unit 11. Therefore, since the required amount of hot water can be stored with a simple device, the device becomes an energy saving device corresponding to the hot water supply load.

A case where the current remaining hot water amount is grasped will be described. When the hot water is discharged while being stored, low-temperature water is supplied from the lower part of the hot-water storage tank 1, and the level of the low-temperature water gradually rises. And when it reaches the position of the hot water amount detecting means 8, the signal is sent to the water supply amount detecting means 12,
The hot water amount calculation unit 15 integrates the water supply amount. After that, when the hot water is stopped, the flow rate of the hot water amount calculation unit 15 is subtracted from the hot water amount of the hot water amount detecting means 8 which has become clear in advance. Therefore, the amount of new hot water can be determined.

A description will be given of the storage of the required amount of hot water and the determination of the remaining amount of hot water when hot water is generated during operation. In this case, it can be easily achieved by combining the above-described operation of boiling the set amount of hot water and the operation of determining the amount of remaining hot water. That is, the flow rate of the hot water amount calculating unit 15 is subtracted from the integrated result of the hot water amount calculating unit 10 at the time of the boiling operation, and when the value becomes the hot water amount at the start of the initial operation, the circulation pump 2, The operation of the heater 4 is stopped. The hot water storage amount at that time becomes the set hot water amount. Also,
The remaining hot water amount after the operation is stopped during hot water supply and the hot water is further continued can be found from the integration of the hot water amount calculation unit 10 and the integration of the hot water amount calculation unit 15.

[0015]

As described in the above embodiments, the electric water heater of the present invention comprises a hot water supply circuit in which a hot water tank, a circulation pump, and a heater with a built-in heater are sequentially connected, and a first water heater provided upstream of the heater. A temperature detecting means, and a second means provided downstream of the heater.
Temperature detecting means, hot water quantity detecting means for detecting the hot water quantity in the hot water tank, hot water quantity setting means for presetting the hot water quantity to be stored in the hot water tank, the first temperature detecting means, the second temperature detecting means, and the heater A heating circulating flow rate is calculated from an input, and a hot water amount calculating section for integrating the heating circulating flow rate, and the hot water amount calculating section are controlled by a signal from the hot water amount detecting means. By providing a control unit for controlling the circulation pump and the heater with a signal from the unit, in the boiling operation, when the hot water is stored up to the position of the hot water amount detecting means provided at a position where the hot water amount is known in advance, the signal is output. Is sent to the heating water amount calculation unit, where the heating circulation flow rate is calculated from the inputs of the first temperature detection means, the second temperature detection means, and the heater, and is integrated to calculate the heating water amount. Then, the operation is continued until the set value of the hot water amount setting means is reached. Therefore, the set amount of hot water can be stored in the hot water tank, and an energy saving device corresponding to the hot water supply load can be realized with a simple device.

[0016] A water supply amount detecting means provided in a water supply pipe or a tapping pipe of a hot water storage tank, a water supply amount calculating unit for integrating a water supply amount by a signal of the water supply amount detection means, and a heating water amount calculation by a signal of the water amount detection means. Controlling the section and the hot water amount calculating section, the hot water amount setting means, the hot water amount detecting means, the hot water amount calculating section, the circulation pump by the signal of the hot water amount calculating section,
By providing a control unit for controlling the heater, when hot water is generated during operation, the hot water amount calculating unit and the hot water amount calculating unit operate based on a signal from the hot water amount detecting means, and calculate a difference in the amount of hot water between the respective calculating units. I do. Then, the operation is continued until the value becomes equal to the difference between the set value of the hot water amount setting means and the hot water amount of the hot water amount detecting means. Therefore, also in this case, the set amount of hot water can be stored in the hot water storage tank, and the amount of hot water stored at that time becomes the new remaining amount of hot water. Further, when hot water is discharged after the boiling operation is stopped, the heated hot water amount calculation unit does not operate, so that the remaining hot water amount can be determined from the hot water amount of the hot water amount detection means and the calculation result of the hot water amount calculation unit.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an electric water heater according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of an electric water heater according to another embodiment of the present invention.

FIG. 3 is a configuration diagram of an embodiment of a conventional electric water heater.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hot water storage tank 2 Circulation pump 3 Heater 4 Heater 5 1st temperature detection means 6 2nd temperature detection means 7 Pump flow control means 8 Hot water quantity detection means 9 Hot water quantity setting means 10 Heating water quantity calculation part 11 Control part 12 Water supply quantity detection means 13 Water supply pipe 14 Hot water pipe 15 Hot water quantity calculation unit

 ────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-2-203151 (JP, A) JP-A-60-216145 (JP, A) JP-A-60-295464 (JP, A)

Claims (2)

(57) [Claims] 1. A hot water supply circuit in which a hot water storage tank, a circulation pump, and a heater with a built-in heater are sequentially connected, a first temperature detection means provided upstream of the heater, and a second temperature detection means provided downstream of the heater.
Temperature detecting means, hot water quantity detecting means for detecting the hot water quantity in the hot water tank, hot water quantity setting means for presetting the hot water quantity to be stored in the hot water tank, the first temperature detecting means, the second temperature detecting means, and the heater Calculating a heating circulation flow rate from an input, and calculating a heating hot water amount calculating unit for integrating the heating circulation flow rate; controlling the heating hot water amount calculating unit with a signal from the hot water amount detecting means; A hot water storage type electric water heater comprising the circulation pump and a control unit for controlling the heater with the signal of (1). 2. A hot water supply circuit in which a hot water tank, a circulating pump, and a heater with a built-in heater are sequentially connected, a first temperature detection means provided upstream of the heater, and a second temperature detection means provided downstream of the heater.
Temperature detecting means, hot water quantity detecting means for detecting the hot water quantity of the hot water storage tank, hot water quantity setting means for presetting the hot water quantity to be stored in the hot water storage tank, and water supply amount detecting means provided in a water supply pipe or tapping pipe of the hot water storage tank; A tapping amount calculating unit for integrating a water supply amount based on a signal from the water supply amount detecting unit; and a heating flow rate for calculating a heating flow rate from inputs of the first temperature detecting unit, the second temperature detecting unit, and the heater, and integrating the heating flow amount. A flow rate calculator, and a controller that controls the hot water amount calculating section and the heating flow rate calculating section with a signal from the hot water quantity detecting section, and that the hot water amount setting section, the hot water amount detecting section, the heating flow rate calculating section, and the hot water amount calculating section A hot-water storage type electric water heater comprising: a circulating pump; and a control unit for controlling the heater by a signal.