JPS6251380B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention provides a low input type and large capacity (e.g.
The purpose of this hot water storage type water heater, which has a hot water storage capacity of 200 or more), is to achieve the following points with a single heat source.

(1) High temperature hot water can be obtained in a short time. (Take hot water quickly).

(2) The amount of heat dissipated from the can can be extremely reduced.

(3) It can be used in an energy-saving manner. (frugal use).

Generally speaking, hot water storage type water heaters can be classified as “hot water storage type”.
They can be roughly divided into "semi-hot water storage type" and "instant hot water storage type."

The latter two types have a large input capacity (for example, 16,000 to 18,000 kcal/h or more) and a small hot water storage capacity (for example, 60 to 80 kcal/h or less), so they are close to instantaneous water heaters and are therefore out of the question. The present invention relates to a "hot water storage type" hot water storage type water heater with low input capacity and large capacity.

This hot water storage type water heater had the following drawbacks.

(1) Since the amount of hot water stored is large, it takes a long time to boil the water.

(2) Even if only a small amount of hot water (eg 40 to 50 liters) is used, the entire stored amount of hot water (eg 200 liters) must be boiled.

(3) When the entire amount of hot water is used up in a short period of time, even if you want hot water, you cannot get hot water right away because it takes a long time to boil the water.

(4) In large-capacity hot water storage systems, the amount of heat radiated from the hot water storage can is large. In the case of hot water storage type, the hot water temperature is 80 to 85.
It is common to boil the water until it reaches ℃. Therefore, the amount of natural heat dissipation increases due to the length of time it is left unused, making it uneconomical compared to instantaneous water heaters.

Currently, there is no hot water storage type water heater that can overcome these drawbacks with a "single heat source."

Next, technical means (conventional example) for solving the above drawbacks will be described.

(1) As shown in Fig. 5, there is a configuration in which two heat sources are provided above and below, and the upper and lower heat sources are switched and operated to achieve the purpose.

(2) As shown in FIG. 6, there is a configuration in which one heat source is disposed at the top and controlled by another means (for example, a pump) to achieve the purpose.

(3) As shown in Figure 7a, there is a configuration in which a single heat source is used and a riser pipe is placed at the top.

In the above configuration, 1 and 2 are extremely difficult to put into practical use in terms of cost and control. The purpose of method 3 can be achieved if only the quick access to high-temperature hot water is considered, but as shown in Figure 7b, the temperature distribution inside the hot water storage can becomes extreme, resulting in a lack of stability in the hot water temperature when hot water is tapped. It was hot.

Furthermore, in the case of a large-capacity hot water storage type water heater, as a means for reducing the amount of heat dissipated, there are configurations such as adding a heat insulating material to the outer surface or cutting the outer surface with foamed urethane. All of these measures were taken as follow-up measures and were not fundamental configurations, and the reduction in heat dissipation and cost were at odds with each other.

The present invention is based on a circuit configuration in which the hot water temperature inside the hot water storage can is set low and the hot water temperature is 80 to 85 degrees Celsius, and by using the same heat exchanger as the boiling circuit and the reboiling circuit, After fully considering the cost and control aspects, we ensured that the water temperature was stable with a single heat source.
The present invention provides a hot water storage type water heater that achieves the above object of low heat radiation loss.

Hereinafter, one embodiment of the present invention will be described based on FIG. 1. Reference numeral 1 denotes a hot water storage can with a cylindrical cross section, the upper and lower ends of which are sealed with mirror plates 2 and 2'. This hot water storage can body 1 is equipped with a circuit 3 for quickly drawing hot water at the upper part and a circuit 4 for full boiling at the lower part, and also has a hot water outlet 5 at the upper end and a water supply opening 6 at the lower end.

Reference numeral 7 denotes a heat source section (heat exchanger section), which includes a water supply side circuit 8 and a hot water supply side circuit 9. One side of this water supply side circuit 8 is connected to the lower part of the hot water storage can 1 via a solenoid valve 10, and the other side is connected to a hot water tap circuit 11. Next, the hot water supply side circuit 9 connects the quick draw circuit 3 and full boiling circuit 4 to the three-way switching valve 12.
It also communicates with the tap water outlet 5 through a water pressure responsive valve 13.

This hydraulic pressure responsive valve 13 is linked to the electromagnetic valve 10.

Further, a thermistor 14 for controlling full boiling is set at the lower part of the hot water storage can 1, and a thermistor 15 for controlling early draw is set at the upper part of the hot water storage can 1.

As described above, the heat source section 7 is provided outside the hot water storage can body 1, and the configuration includes the quick draw circuit section 3 and the full boiling circuit section 4. Furthermore, the hot water outlet 5 circuit is connected to the hot water supply via the heat source section. By using the tap circuit 11, it is possible to achieve stable hot water supply (full boiling) and rapid hot water withdrawal using one heat source. Furthermore, boiling and re-boiling can be performed using one heat source by controlling the hydraulic valve 13 and the electromagnetic valve 10, thereby realizing a storage type water heater with low heat radiation loss.

Next, we will discuss the operating aspects separately during full boiling, early water heating, and hot water supply.

(1) In the case of full boiling (boiling the full capacity of the water storage can) The three-way switching valve during full boiling is on the full boiling circuit side. Furthermore, since the hot water tap is not opened, the solenoid valve 10 is in an open state. Therefore, when heating is started in a state filled with low-temperature water, high-temperature hot water heated by the heat exchanger 7 is sent from the entire boiling circuit in the lower part of the hot water storage can 1. The temperature of the hot water inside the hot water storage can 1 gradually increases with the heating time. In this case, since the draft is not large, the convection speed is slow, and the temperature of the hot water inside the hot water storage can 1 increases uniformly. Furthermore, hot water will be fed from the bottom of the storage can body 1,
As shown in FIG. 2, the temperature of the entire stored hot water becomes uniform.
This is the most important aspect of the performance of a hot water storage type water heater and is satisfactory.

(2) In the case of early release In this case, the three-way valve 12 is on the early release circuit side. Furthermore, since the hot water tap is not opened, the solenoid valve 10 is in an open state. Therefore, when heating starts in a state filled with low-temperature water, the heat exchanger 7
High-temperature hot water heated in is sent from the upper part of the hot water storage can body 1 through a quick draw circuit in a draft. As the heating continues, high-temperature hot water will be stored in the upper layer of the hot water storage can. Therefore, as shown in FIG. 3, hot water can be obtained in a short time.

As described above, it is possible to provide a system that can quickly obtain high-temperature hot water and has excellent hot water output stability when the entire stored amount of hot water is boiled.

(3) When supplying hot water When the hot water tap is opened, water is supplied from the water supply port 6, and the hydraulic valve 13 is operated to close the solenoid valve 10. At this time, the high-temperature hot water is reheated by the heat exchanger 7 from the tap 5 and is discharged from the hot water tap. One of the features of hot water storage type water heaters is that the hot water temperature is high (usually 80 to 85 degrees Celsius). This means that the water temperature inside the can is kept at 80 to 85 degrees Celsius, which is a disadvantage compared to the instant type in terms of heat radiation loss.

Therefore, as in the present invention, the hot water temperature inside the can body is set to 60°C or less while maintaining the characteristic of a hot water storage type water heater, that is, the hot water temperature is 80 to 85°C.

This is when boiling with one heat source (60℃)
This was made possible by establishing a system in which natural convection is used for heating, and forced convection is used for reboiling (80 to 85°C). The above is shown in Figure 4.
Shows the difference in heat dissipation between 85℃ and 60℃ settings.

We have talked about full boiling, early drawing, and hot water supply, but by realizing early drawing of high-temperature water, it is possible to increase both the total amount of hot water storage (e.g. 200 ml) and economical usage (e.g. 40 to 50 ml) in conjunction with thermistor control. It is possible to use it.

As is clear from the above description, according to the present invention, boiling and reboiling can be performed using one heat source by controlling a water pressure responsive valve and a solenoid valve.
By controlling the distribution of high-temperature hot water from individual heat sources to the upper and lower parts of the hot water storage can, the following effects can be obtained.

(1) High-temperature hot water can be taken quickly, which greatly improves usability.

(2) By making boiling and reboiling possible with one heat source, the set water temperature of the hot water storage can can be lowered and heat radiation loss can be reduced.

(3) The ability to quickly draw high-temperature hot water allows for economical use in conjunction with thermistor control.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram showing the principle of a hot water storage type water heater according to an embodiment of the present invention, Fig. 2 is a characteristic diagram showing the hot water temperature performance during full boiling, and Fig. 3 is a diagram showing the hot water temperature performance during early drawing. Characteristic diagram showing hot water temperature performance, Figure 4 shows the set hot water temperature of 85℃ and 60℃
Figure 5 is a cross-sectional view of a conventional hot water storage water heater with a heat source at the top and bottom, and Figure 6 is a characteristic diagram showing the comparative performance of the heat radiation amount. FIG. 7a is a cross-sectional view of a conventional hot water heater in which only quick draw is taken into consideration, and FIG. 7b is a hot water output performance diagram of FIG. 7a. 1... hot water storage type can body, 3... quick draw circuit, 4...
...All boiling circuit, 5...Tail outlet, 6...Water inlet,
7...Heat source part (heat exchanger), 8...Water supply side circuit,
9... Hot water supply side circuit, 10... Solenoid valve, 12... Three-way switching valve, 13... Water pressure responsive valve, 14, 1
5...Thermistor.

Claims (1)

[Claims] 1. A hot water storage type can, a water supply port that supplies water to the lower part of the hot water storage type can, and a water supply side circuit that supplies water led from the hot water storage type can to one end of the heat source section via a solenoid valve. and two circuits that supply hot water from the other end of the heat source section to the upper and lower parts of the hot water storage type can, and a circuit that supplies hot water taken out from above the hot water storage type can to the other end of the heat source section. and a hot water tap circuit that guides hot water from one end of the heat source section to the hot water tap.