JP2542902Y2 - 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 supply apparatus in which a hot water tank and a heat source are separately provided.

[0002]

2. Description of the Related Art A typical prior art is shown in FIG. Tap water or the like is pumped into a hot water storage tank 1 from a pipe 2, and the water in the hot water storage tank 1 is heated by a heat source device 5, which is a hot water boiler, from a pipe 3 via a pump 4, and is supplied from a pipe 6 to a hot water storage tank. It is led to 1 and circulated. The hot water in the hot water storage tank 1 is supplied from above to a hot water tank 1 via a pipe 7, which is connected to the hot water storage tank 1 via a pump 9.

[0003]

In the prior art shown in FIG. 4, when a large amount of hot water is discharged from the curran 8, low-temperature water that is not sufficiently heated by the heat source 5 is discharged. 8 will be discharged.

[0004] An object of the present invention is to provide a hot water supply apparatus capable of supplying a desired high temperature of hot water as much as possible.

[0005]

SUMMARY OF THE INVENTION The present invention is directed to a hot water storage tank to which water to be heated is pumped from below, a heat source for heating water, a thermometer for detecting the temperature of the upper part of the hot water storage tank, and a hot water storage tank. A first pump for supplying water at a lower portion of the hot water supply to the heat source device, a second pump for supplying water at an upper portion of the hot water storage device to the heat source device, a hot water supply pipe for guiding heated water from the heat source device, and an upper portion of the hot water storage device And a hot water supply pipe, a communication pipe having an electromagnetic valve interposed therebetween, an operation state in which the first pump is driven, the second pump is stopped and the electromagnetic valve is opened, and the first pump is stopped and the second pump is opened. A hot water supply device characterized by including control means for driving and switching the operation state of closing the solenoid valve according to the temperature of the upper part of the hot water tank.

[0006]

According to the present invention, water to be heated, such as tap water, is supplied to the hot water tank from the lower portion thereof, and the lower water in the hot water tank is guided to the heat source device by the first pump. Since it is heated and the solenoid valve is in the open state, it is supplied from the hot water supply pipe to the upper part of the hot water storage tank via the communication pipe, and the water in the hot water storage tank is heated in this way. In the hot water storage tank, water having a high temperature is sequentially increased from bottom to top.
It is stored in layers such as hot water at 80 ° C. Hot water is supplied from the hot water supply pipe directly from the heat source device or from the top of the hot water storage tank via the connecting pipe. As the high-temperature hot water in the hot water tank is used, water is supplied from the lower part, the low-temperature hot water layer rises, and the water temperature in the upper part of the hot water tank decreases. The water temperature in the upper part of the hot water tank is constantly monitored by a thermometer, and the first pump is limited to a high-temperature water layer in which the water temperature in the upper part of the hot water tank is 60 ° C. or higher.

When the water temperature in the upper part of the hot water storage tank becomes lower than 60 ° C. due to the rise of the low-temperature hot water layer, the first pump is stopped, the second pump is operated, and the solenoid valve provided on the communication pipe is closed at the same time. The second pump heats the low-temperature hot water in the upper part of the hot water storage tank with a heat source device and guides it to the hot water supply pipe. The water heated by the heat source is high-temperature hot water, which is supplied without being mixed with the low-temperature hot water in the upper part of the hot water storage tank. Further, the second pump guides the low-temperature hot water in the upper portion of the hot water tank higher than the cold water in the lower portion of the hot water tank to the heat source device, so that the hot water supply capability of the heat source device increases. Thus, a large amount of high-temperature hot water can be used.

[0008]

FIG. 1 is an overall system diagram of an embodiment of the present invention. Water to be heated is pressure-fed from a water storage tank 13 to a lower part 12 of a sealed hot water storage tank 11 which is formed to be elongated vertically. The water storage tank 13 is disposed above the hot water storage tank 11, and for example, tap water is supplied to the water storage tank 13 from a pipe 15.

The heat source unit 16 is, for example, an instantaneous water heater. Water to be heated is supplied to the heat source unit 16 from the lower part 12 of the hot water tank 11 via a pipe 17 and a first pump 18, furthermore, a pipe 19, a check valve 20 and a pipe 21.

[0010] Hot water consuming equipment such as curran 22 is supplied with desired high-temperature hot water via a hot water supply pipe 23. The hot water heated to a high temperature from the heat source unit 16 is guided to the hot water supply pipe 23.

A pipe 25 is connected to the upper part 24 of the hot water storage tank 11, and the hot water from the pipe 25 is led to the heat source 16 via the pipe 21 via the second pump 26 and the check valve 27. I will The upper part of the hot water storage tank 24 is also connected to a conduit 28 communicating with the hot water supply pipe 23, and an electromagnetic valve 29 is interposed in the conduit 28. The opening and closing of the solenoid valve 29 is controlled by the control circuit 30. In the upper part 24 of the hot water storage tank 11, a temperature detecting element 31 is provided, and an output of the temperature detecting element 31 is given to a control circuit 30, and the control circuit 30 opens and closes the electromagnetic valve 29 and operates the first pump and the second pump. Controls operation stop.

FIG. 2 is a simplified system diagram for explaining the operation of the embodiment shown in FIG. 1, and FIG.
9 is a flowchart for explaining the operation of the “0”. The process proceeds from step a1 to step a2. If the temperature T1 detected by the temperature detecting element 31 is lower than a predetermined temperature, for example, less than 40 ° C. and the temperature is low, the process proceeds to step a3, as shown in FIG. Then, the first pump 18 is driven, the second pump 26 is stopped, and the solenoid valve 2
9 is opened and heat source 16 heats the water from line 21. Thus, water from the lower part 12 in the hot water tank 11 is
7 through a first pump 18, a pipe 19, a check valve 20 and a pipe 21 to be heated by the heat source 16, and the heated hot water is passed through a pipe 28 and a solenoid valve 29 to the hot water storage tank 11.
Of the hot water storage tank 11 is circulated. Thus, the temperature of water in hot water storage tank 11 rises. Such an operation is performed in a range where the temperature detected by the temperature detecting element 31 is less than 80 ° C. in Step a4. At this time, when the curan 22 is opened, the heat source 1
High-temperature hot water from 6 is supplied through a hot water supply pipe 23, and high-temperature hot water is obtained from the curran 22.

In step a4, the temperature detecting element 31
When it is determined that the temperature T1 detected by the controller has become equal to or higher than 80 ° C., in the next step a5, the pump 1
8 and 26 are shut off, the solenoid valve 29 is opened, and the heat source 16
Operation is suspended. Thus, FIG.
In the state where the high-temperature hot water is stored as shown in (2), the high-temperature hot water in the upper part of the hot water storage tank 11 is passed through the conduit 28, the solenoid valve 29 and the hot water supply pipe 23, and
Can be supplied from In FIG. 2 (2), 4
High temperature hot water between 0 ° C. and 80 ° C. is indicated by reference A and
Low-temperature hot water of less than 0 ° C. is indicated by reference numeral B, and water at normal temperature, for example, about 5 ° C., is indicated by reference numeral C. In hot water storage tank 11,
Water is stored in such layers A, B, and C.

When the high-temperature hot water A in the hot water storage tank 11 is used from its upper portion 24, and the temperature detection element 31 determines in step a6 that the detected temperature T1 has become less than 60 ° C. Move to step a7. In step a7, the pump 18 is stopped, the pump 26 is driven, the solenoid valve 29 is closed, and therefore, as shown in simplified form in FIG. The water C is supplied to the heat source 16 from the pipe 21 via the pipe 28 via the pump 26 and the solenoid valve 27 and is heated, and the high-temperature hot water thus obtained is supplied to the hot water supply pipe 2.
3 through a curan 22. In this way,
The low-temperature hot water or the like in the upper part 24 of the hot water storage
And the hot water is supplied from the hot water supply pipe 23 to the curran 22. Therefore, even when the high-temperature hot water A is not stored in the hot water storage tank 11, the high-temperature hot water can be easily used. .

[0015]

As described above, according to the present invention, cold water is guided from the lower part of the hot water tank to the heat source by the first pump and heated, and the high-temperature hot water obtained in this way returns to the upper part of the hot water tank via the solenoid valve. Thus, high-temperature hot water can be stored in the upper part of the hot water tank, and the high-temperature hot water can be taken out from the upper part of the hot water tank and used. If the use of the high-temperature hot water in the upper part of the hot water storage tank is detected by a thermometer provided in the upper part of the hot water storage tank, the first pump is stopped and the second pump is driven, and at the same time, the electromagnetic wave provided in the communication pipe is provided. Valve closes. Thus, the low-temperature hot water in the upper part of the hot water storage tank is guided to the heat source device by the second pump and heated, and can be used as high-temperature hot water.
In this case, the solenoid valve of the connecting pipe is closed, so that low-temperature hot water does not mix with high-temperature hot water, and low-temperature hot water has a higher temperature than cold water, so the temperature rise by the heat source unit may be small, and the desired temperature High temperature hot water can be obtained in large quantities.

[Brief description of the drawings]

FIG. 1 is an overall system diagram of an embodiment of the present invention.

FIG. 2 is a simplified system diagram for explaining the operation of the embodiment shown in FIG. 1;

FIG. 3 is a flowchart for explaining an operation of a control circuit 30 shown in FIG. 1;

FIG. 4 is a system diagram showing the prior art of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Hot water storage tank 16 Heat source device 18 1st pump 22 Karan 23 Hot water supply pipe 26 2nd pump 29 Solenoid valve

Claims (1)

(57) [Scope of request for utility model registration] 1. A hot water storage tank to which water to be heated is pumped from a lower part, a heat source device for heating water, a thermometer for detecting a temperature of an upper part of the hot water storage tank, and a water source at a lower part of the hot water storage tank to a heat source device. A first pump for supplying, a second pump for supplying water from an upper portion of the hot water tank to the heat source device, a hot water supply pipe for guiding heated water from the heat source device, and a communication between the upper portion of the hot water storage tank and the hot water supply pipe; A communication pipe having an electromagnetic valve interposed therebetween, an operation state in which the first pump is driven, the second pump is stopped and the electromagnetic valve is opened, and the first pump is stopped and the second pump is driven,
Control means for switching between an operation state of closing the electromagnetic valve and a temperature of an upper part of the hot water storage tank.