JPH08145470A - Hot water storing type electrical hot water heater - Google Patents

Abstract

PURPOSE: To provide an instant hot water supplying of an electrical hot water heater, a stabilized fed-out hot water temperature and improve a convenience in use of the electrical hot water heater. CONSTITUTION: There are provided a hot water feeding circuit in which a hot water storing tank 1, a circulating pump 2 and a heater 3 are connected in sequence; a temperature sensor 4 arranged at a downstream side of the heater 3; the number-of-revolution control part 5 for controlling the number of revolution of the circulating pump 2 in response to a signal obtained from the temperature sensor 4; a hot water amount sensor 6 arranged in the hot water storing tank 1; and a controller 7 for controlling the circulating pump 2 and the heater 3 in response to a signal obtained from the hot water amount sensor. Accordingly, as hot water is fed out of the hot water storing tank 1 and a remained amount of hot water reaches a position of the hot water amount sensor 6, the hot water amount sensor 6 detects it and sends a signal to the controller 7, the heater 3 is operated to cause hot water of a predetermined temperature to be flowed into the upper part of the hot water storing tank 1. Accordingly, even in the case that the remained volume of hot water in the hot water storing tank 1 is reduced, the hot water temperature is not decreased and the hot water of the predetermined temperature can be automatically boiled up at once, resulting in that its convenience in use of the electrical hot water heater is improved.

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 storage tank and hot water is stored from the upper part of the hot water storage tank.

[0002]

2. Description of the Related Art Conventionally, a hot water storage type electric water heater of this type is known from Japanese Patent Application Laid-Open No. 2-169958, but a heating element is provided above the hot water storage tank to boil a small amount. Then, the hot water temperature measuring means provided in the vicinity of the heating element detects the hot water temperature, and when a predetermined temperature is reached, the energization is stopped.

[0003]

However, in the above configuration, when the boiling operation is started when a large amount of hot water is discharged and the hot water is less than the position of the upper heating element,
In order to uniformly boil the water above the heating element, the residual hot water and water are mixed and the temperature once drops, after which the whole is boiled,
It takes time to reach a predetermined temperature. Further, if hot water is discharged during the boiling operation, the hot water temperature changes, which is inconvenient.

[0004]

In order to solve the above-mentioned problems, the present invention solves the above-mentioned problems by providing a hot water storage tank for supplying water from the lower part and discharging hot water from the upper part, a heater provided separately from the hot water storage tank, and the hot water storage tank. A circulation pump that communicates with the lower part and allows the hot water that has passed through the heater to flow from the upper part of the hot water storage tank, a hot water amount detector provided in the hot water storage tank, and control of the circulation pump and the heater by a signal from the hot water amount detector And a controller for performing.

Further, a hot water storage tank which is supplied with water from a lower portion and tapped from an upper portion, and a heater which is provided separately from the hot water storage tank,
A circulation pump that communicates with the lower part of the hot water storage tank and allows the hot water that has passed through the heater to flow from the upper part of the hot water storage tank, a hot water amount detector provided in the hot water storage tank, and a signal from the hot water amount detector to measure the time. A timer and a controller for operating the circulation pump and the heater for a time set by the timer based on a signal from the hot water amount detector are provided.

Further, a hot water storage tank which is supplied with water from the lower part and is discharged from the upper part, a heater provided separately from the hot water storage tank, and a lower part of the hot water storage tank are communicated with each other, and the hot water passed through the heater is stored as hot water. A circulation pump that is introduced from the upper part of the tank, a first temperature detector provided downstream of the heater, and a second temperature detector provided below the hot water tank or upstream of the heater.
A rotation speed control unit that controls the rotation speed of the circulation pump with a signal from the first temperature detector, a hot water amount detector provided in the hot water storage tank, and a timer that receives a signal from the hot water amount detector and measures time. A timer changing means for switching the setting of the timer by a signal of the second temperature detector, and a control for operating the circulation pump and the heater at a time set by the timer based on a signal from the hot water amount detector It is equipped with a vessel.

Furthermore, a hot water storage tank which is supplied with water from the lower part and tapped from the upper part, a heater provided separately from the hot water storage tank, and a lower part of the hot water storage tank are communicated with each other, and the hot water passed through the heater is stored as hot water. A circulation pump that flows in from the upper part of the tank, a plurality of hot water amount detectors provided in the hot water storage tank, a hot water amount setting means, and the circulation pump and the heater are controlled by signals from the hot water amount setting means and the hot water amount detector. And a controller.

Further, a hot water tank supplied from the lower part and tapped from the upper part, a heater provided separately from the hot water tank, and a lower part of the hot water tank are communicated with each other to store hot water passed through the heater. A circulation pump that flows in from the upper part of the tank, a temperature detector that is provided downstream of the heater and that generates a first signal and a second signal that is a temperature lower than the first signal, and the first signal of the temperature detector causes the circulation. A second rotation speed control unit that controls the rotation speed of the pump and a controller that controls the rotation speed of the circulation pump by the second signal of the temperature detector immediately after the start of operation are provided.

[0009]

According to the present invention, the low temperature water flowing out of the hot water storage tank flows into the heater through the circulation pump and is heated. At this time, the rotation speed control unit receives the signal from the temperature detector and controls the rotation speed of the circulation pump so that the outlet temperature becomes a predetermined hot water temperature. Then, the hot water heated to a predetermined temperature flows into the upper part of the hot water storage tank and is stored from the upper part of the hot water storage tank as the operation progresses. When the hot water is discharged from the hot water storage tank, water is supplied from the lower part and the hot water layer rises to the upper part. Then, when the supplied water reaches the position of the hot water amount detector, the hot water amount detector detects it and sends a signal to the controller to operate the circulation pump and the heater to hot water of a predetermined temperature. To the upper part of the hot water storage tank. Therefore, even when the amount of remaining hot water in the hot water storage tank is low during hot water discharge, the hot water having a predetermined temperature can be immediately and automatically boiled.

When the amount of remaining hot water reaches the position of the hot water amount detector after the hot water is discharged from the hot water storage tank, the controller energizes the circulation pump and the heater by the signal of the hot water amount detector, and the signal of the timer. Drive the car until you receive it. Therefore, even when the amount of remaining hot water becomes small, the amount of hot water at the predetermined temperature can be automatically and immediately secured, and the hot water shortage can be eliminated.

Further, using the timer changing means,
The feed water temperature is detected by the signal of the second temperature detector, and when the feed water temperature is high, the set time of the timer is shortened, and conversely, when the feed water temperature is low, the set time is lengthened to increase the additional time. It is possible to switch the amount of boiling water according to the load, thus saving energy.

Next, during the boiling and reheating operations, the boiling water amount is set by the user by the hot water amount setting means. Then, in response to the signal, a detector for detecting the boiling water amount is selected from the plurality of hot water amount detectors, and when the boiling water at a predetermined temperature reaches that position, the controller causes the heater to Stop energizing. Therefore, it becomes possible to boil the required amount of hot water against the hot water supply load that changes daily.

In the start-up operation, the controller uses the second signal, which is lower than the boiling water temperature immediately after the start of operation, with respect to the boiling water temperature, which is the first signal of the temperature detector, of the circulating pump. Performs rotation speed control. Therefore, the hot water temperature does not overshoot at the time of start-up, the heater is not broken or the heater protection device is activated to stop the operation, and the hot water cannot be stored. Therefore, the durability of the heater and the reliability of the device are improved.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIG.

In FIG. 1, 1 is a hot water storage tank, 2 is a circulation pump, 3 is a heater, and a heater is a heat source. The lower part of the hot water storage tank 1, the circulation pump 2,
The heater 3 and the upper part of the hot water storage tank 1 are sequentially connected to form a hot water supply circuit. Reference numeral 4 is a temperature detector, which is provided downstream of the heater 3. 5 is a rotation speed control unit,
Based on the signal from the temperature detector 4, the circulation pump 2
Control the rotation speed of. A hot water amount detector 6 is provided in the hot water storage tank 1. A controller 7 controls the circulation pump 2 and the heater 3 based on a signal from the hot water amount detector 6.

In the above structure, the low temperature water in the lower portion of the hot water storage tank 1 flows into the heater 3 by the action of the circulation pump 2 and is heated. In that case, the temperature detector 4 detects the outlet temperature of the heater 3, sends a signal to the rotation speed control unit 5 so as to reach a predetermined temperature, and controls the rotation speed of the circulation pump 2. Then, the high-temperature water heated to a predetermined temperature flows into the upper portion of the hot water storage tank 1 and is sequentially stored from the upper portion. Here, when the hot water is discharged, low temperature water is supplied from the lower part of the hot water storage tank 1, and the hot water layer rises to the upper part. When the supplied water reaches the position of the hot water amount detector 6, the hot water amount detector 6 detects it and sends a signal to the controller 7 to operate the heater 2 to bring the hot water at a predetermined temperature. Is allowed to flow into the upper part of the hot water storage tank 1. Therefore, even if the amount of remaining hot water in the hot water storage tank 1 becomes small during hot water discharge, the hot water at the predetermined temperature can be automatically and immediately boiled without lowering the hot water discharge temperature, thus improving usability.

Next, a second embodiment will be described. In FIG. 2, the same functions and operations as those of the first embodiment are designated by the same reference numerals, and the description thereof will be omitted. Reference numeral 8 denotes a timer, which receives a signal from the hot water amount detector 6 and measures time. A controller 9 energizes the circulation pump 2 and the heater 3 with a signal from the hot water amount detector 6, and energizes the circulation pump 2 and the heater 3 based on a signal from the timer 8. Stop.

In the above construction, when the amount of remaining hot water reaches the position of the hot water amount detector 6 after the hot water is discharged from the hot water storage tank 1, the controller 9 energizes the heater 2 by a signal from the hot water amount detector 6. The additional heating operation is performed until the signal from the timer 8 is received. Therefore, even when the amount of remaining hot water becomes small, the amount of hot water at the predetermined temperature can be automatically boiled and secured, so that hot water shortage can be eliminated.

Next, a third embodiment will be described. In FIG. 3, the same functions and operations as those of the first and second embodiments are designated by the same reference numerals, and the description thereof will be omitted. 10
Is a second temperature detector, which is provided below the hot water tank 1 or upstream of the heater 3. Reference numeral 11 is a timer changing means, which switches the setting of the timer 8 by a signal from the second temperature detector 10. A controller 12 controls the circulating pump and the heater 3 based on signals from the hot water amount detector 6 and the timer 8.

In the above structure, when the amount of remaining hot water discharged from the hot water storage tank 1 reaches the position of the hot water amount detector 6, the controller 12 sends a signal from the hot water amount detector 6 to the circulation pump 2 and the heating device. Energize vessel 2. Then, the signal of the second temperature detector 10 is detected, and the additional heating operation is performed until the signal of the timer 8 is received. Here, when the signal of the second temperature detector 10 detects a low water temperature, the timer 8 is set long, and conversely, when a high water temperature is detected, the timer is changed to be short. The means 11 are switched. Therefore, it becomes possible to switch the amount of additional boiling water according to the load, and energy can be saved.

Next, a fourth embodiment will be described. In FIG. 4, those having the same functions and operations as those of the first, second and third embodiments are designated by the same reference numerals, and the description thereof will be omitted. Reference numeral 13 denotes a hot water amount detector, which is provided in plural in the hot water storage tank 1. A hot water amount setting means 14 sends a signal to the hot water amount detector 13. Reference numeral 15 is a controller, which stops the energization of the circulation pump 2 and the heater 3 based on signals from the hot water amount setting means 14 and the hot water amount detector 13.

In the above structure, the boiling water amount is set by the hot water amount setting means 14 by the user or the like. Then, in response to the signal, a detector for detecting the boiling water amount is selected from among the plurality of hot water amount detectors 13, and when the boiled hot water at a predetermined temperature reaches the hot water amount detector 13, the controller. Reference numeral 15 stops energization of the heater 3. Therefore, the required amount of hot water can be boiled every day or throughout the year.

Next, a fifth embodiment will be described. In FIG. 5, components having the same functions and operations as those of the first, second, third and fourth embodiments are designated by the same reference numerals, and the description thereof will be omitted. Reference numeral 16 denotes a temperature detector, which is provided downstream of the heater 3 and configured to generate a first signal and a second signal having a temperature lower than that of the first signal. A rotation speed control unit 17 controls the rotation speed of the circulation pump 2 by the first signal of the temperature detector 16. Reference numeral 18 denotes a controller, which controls the rotation speed of the circulation pump 2 by the second signal of the temperature detector 16 immediately after the start of operation.

In the above structure, the controller 18 responds to the boiling water temperature which is the first signal of the temperature detector 16,
Immediately after the start of operation, the rotation speed of the circulation pump 2 is controlled by the second signal that is lower than the boiling water temperature. Then, after that, the temperature detector 1 is controlled by the rotation speed control unit 17.
The rotation speed of the circulation pump 2 is controlled by the first signal 6 to boil. Therefore, the hot water temperature does not overshoot at the time of start-up, the heater is not broken or the heater protection device operates to stop the operation, and the hot water cannot be stored. Therefore, the durability of the heater and the reliability of the device can be prevented. The property is improved.

[0025]

As described above, the electric water heater of the present invention is supplied with water from the lower portion and tapped from the upper portion, a heater provided separately from the hot water storage tank, and a lower portion of the hot water storage tank. A circulation pump that communicates the hot water that has passed through the heater from the upper part of the hot water storage tank, a hot water amount detector provided in the hot water storage tank, and the amount of residual hot water discharged from the hot water storage tank reaches the position of the hot water amount detector. Then, the heater is operated to allow hot water having a predetermined temperature to flow into the upper part of the hot water storage tank. Since it is equipped with a controller, even if there is little remaining hot water in the hot water storage tank during hot water discharge, it is possible to automatically boil hot water at a predetermined temperature without lowering the hot water temperature. Also improves.

Further, a hot water storage tank to which water is supplied from the lower part and hot water is discharged from the upper part, and a heater provided separately from this hot water storage tank,
A circulation pump that communicates with the lower part of the hot water storage tank and allows the hot water that has passed through the heater to flow in from the upper part of the hot water storage tank; A timer and a controller that operates the heater for a predetermined time by a timer when the amount of remaining hot water discharged from the hot water tank reaches the position of the amount of hot water detector, so even if the amount of remaining hot water is low Since the amount of hot water at a predetermined temperature can be secured immediately, it is possible to eliminate hot water shortage.

Further, a hot water storage tank which is supplied with water from a lower part and is discharged from an upper part, a heater provided separately from the hot water storage tank, and a lower part of the hot water storage tank are communicated with each other, and the hot water passed through the heater is stored as hot water. A circulation pump that is introduced from the upper part of the tank, a first temperature detector provided downstream of the heater, and a second temperature detector provided below the hot water tank or upstream of the heater.
A rotation speed control unit that controls the rotation speed of the circulation pump with a signal from the first temperature detector, a hot water amount detector provided in the hot water storage tank, and a timer that receives a signal from the hot water amount detector and measures time. A timer changing means for switching the setting of the timer by a signal of the second temperature detector, and a controller for operating the circulation pump and the heater for a time set by the timer based on a signal from the hot water amount detector And the feed water temperature is detected by the signal of the second temperature detector using the timer changing means. When the feed water temperature is high, the set time of the timer is shortened, and conversely, the feed water temperature is low. In this case, by increasing the set time, it becomes possible to switch the amount of additional boiling water according to the load, and energy can be saved.

Furthermore, a hot water tank supplied from the lower part and tapped from the upper part, a heater provided separately from this hot water tank, and a lower part of the hot water tank are communicated with each other to store hot water passed through the heater. A circulation pump that flows in from the upper part of the tank, a plurality of hot water amount detectors provided in the hot water storage tank, a hot water amount setting means, and a control that controls the operation of the circulating pump and the heater based on signals from the hot water amount setting means and the hot water amount detector. The hot water amount detector for detecting the amount of boiling hot water set by the hot water amount setting means is selected, and when the heated hot water at a predetermined temperature reaches the hot water amount detector, the controller controls the heater. Stop energizing. Therefore, it becomes possible to boil the required amount of hot water in response to the hot water supply load every day or throughout the year.

Further, a hot water storage tank supplied with water from the lower part and tapped from the upper part, a heater provided separately from the hot water storage tank, and a heater provided downstream of the heater, the first signal and the first signal
A temperature detector for generating a second signal having a temperature lower than that of the signal; a rotation speed control unit for controlling the rotation speed of the circulation pump by the first signal of the temperature detector; and a controller, wherein the controller has the temperature With respect to the boiling water temperature which is the first signal of the detector, the rotation speed of the circulation pump is controlled by the second signal which is lower than the boiling water temperature immediately after the start of the operation. Therefore, the hot water temperature does not overshoot at the time of start-up, the heater is not broken or the heater protection device is activated to stop the operation, and the hot water cannot be stored. Therefore, the durability of the heater and the reliability of the device are improved.

[Brief description of 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 electric water heater according to another embodiment of the present invention.

FIG. 4 is a configuration diagram of an electric water heater according to another embodiment of the present invention.

FIG. 5 is a block diagram of an electric water heater according to another embodiment of the present invention.

[Explanation of symbols]

 1 Hot Water Tank 2 Circulation Pump 3 Heater 4 Temperature Detector 5 Rotation Speed Controller 6 Hot Water Detector 7 Controller 8 Timer 9 Controller 10 Second Temperature Detector 11 Timer Changing Means 12 Controller 13 Hot Water Detector 14 Hot Water Volume Setting means 15 Controller 16 Temperature detector 17 Rotation speed controller 18 Controller

Claims (5)

[Claims] 1. A hot water storage tank which is supplied with water from a lower part and is discharged from an upper part, a heater which is provided separately from the hot water storage tank, and a lower part of the hot water storage tank, which communicates with the hot water which has passed through the heater. Hot water storage type electric water heater provided with a circulation pump for inflowing from the upper part of the tank, a hot water amount detector provided in the hot water storage tank, and a controller for controlling the circulation pump and the heater by a signal from the hot water amount detector . 2. A hot water storage tank which is supplied with water from a lower part and is discharged from an upper part, a heater which is provided separately from the hot water storage tank, and a lower part of the hot water storage tank, which communicates with the hot water which has passed through the heater. A circulation pump that flows in from the upper part of the tank, a hot water amount detector provided in the hot water storage tank, a timer that measures the time by receiving a signal from the hot water amount detector, and a timer that is set based on the signal from the hot water amount detector A hot water storage type electric water heater provided with a controller for operating the circulation pump and the heater for a certain period of time. 3. A hot water tank supplied with water from the lower part and discharged from the upper part, a heater provided separately from this hot water tank, and a lower part of the hot water tank communicated with each other to store hot water passed through the heater. A circulation pump for inflowing from the upper part of the tank, a first temperature detector provided downstream of the heater, a second temperature detector provided at the lower part of the hot water storage tank or upstream of the heater, and the first temperature detector. A rotation speed control unit that controls the rotation speed of the circulation pump based on a signal from a temperature detector, a hot water amount detector provided in the hot water storage tank, and a timer that measures the time by receiving a signal from the hot water amount detector, Timer changing means for switching the setting of the timer by the signal of the second temperature detector, and control for operating the circulation pump and the heater for the time set by the signal of the timer based on the signal from the hot water amount detector. With a container Formula electric water heater. 4. A hot water storage tank supplied with water from the lower part and tapped from the upper part, a heater provided separately from this hot water storage tank, and a lower part of the hot water storage tank, which communicates with the hot water passed through the heater. A circulation pump to be introduced from the upper part of the bath, a plurality of hot water amount detectors provided in the hot water storage tank, a hot water amount setting means, and control of the circulation pump and the heater based on signals from the hot water amount setting means and the hot water amount detector. Hot water storage type electric water heater with a controller for performing. 5. A hot water storage tank which is supplied with water from a lower part and is discharged from an upper part, a heater which is provided separately from the hot water storage tank, and a lower part of the hot water storage tank, which communicates with the hot water which has passed through the heater. A circulation pump that flows in from the upper part of the tank, a temperature detector that is provided downstream of the heater and that generates a first signal and a second signal that is a temperature lower than the first signal, and the first signal of the temperature detector causes the circulation. A hot water storage electric water heater comprising a rotation speed control unit for controlling the rotation speed of the pump, and a controller for controlling the rotation speed of the circulation pump with a second signal of the temperature detector immediately after the start of operation.