JPS6091155A - Hot water supplying device - Google Patents

Abstract

PURPOSE:To maintain the effect as an auxiliary heat source as much as the best state by providing a sub tank separately from a hot water storage tank, providing the auxiliary heat source in the lower portion, and providing an automatic switching valve between the connectors. CONSTITUTION:When the rising value of water temperature is low, an electric heater 17 disposed in the lower portion of a sub tank 18 is energized to heat water 12. When a hot water temperature detector 22 detects the prescribed temperature, the heater 17 is deenergized. Simultaneously, an automatic switching valve 21 is opened, the water 12 having heavy specific weight at low temperature in the tank 11 moves from the lower portion to the tank 18 side by the difference of the specific weight due to the difference of the temperature between the water 12 in the tank 11 and the hot water 23 in the tank 18, and the hot water 24 having light specific weight is circulated to the upper portion of the tank 11 side by the high temperature of the tank 18 side. When the water 12 of low temperature is detected, the heater 17 is energized, the valve 21 is closed at the time difference, thereby preventing the convection during the boiling.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a water heater using an auxiliary heat source that effectively stores heat from solar heat or other main heat sources.

The configuration of the conventional example and its problems The first example of a conventional hot water storage device for this type of auxiliary heat source
As shown in the figure, a heat collector that collects solar heat or atmospheric heat 1. Accumulator 2. Compressor 3° Heat exchanger 4. A circulation circuit 8 for the refrigerant 7 is configured by the expansion valve 5 and the refrigerant pipe 6, and the secondary side connection ports 9, 10 of the heat exchanger 4 and the hot water storage tank 1 are connected to each other.
1 constitutes a heat exchange circulation circuit 13 for water 12, a circulation pump 14 is provided in this heat exchange circulation circuit 13, a water supply port 15 is provided at the bottom of the hot water storage tank 11, a hot water outlet 16 is provided at the top of the hot water storage tank 11, and electricity is provided in the hot water storage tank 11. A heater 17 was provided.

In the above configuration, the refrigerant 7 is FFC (R-12
) is turned into high-temperature, high-pressure waste by the compressor 3 and sent to the heat exchanger 4, where it exchanges heat with the water 12 in the hot water storage tank 11, which is sent to the circulation pump 14, and the refrigerant 7 becomes liquid and is depressurized by the expansion valve 5. Heat collector 1 that collects solar heat or atmospheric heat
It passes through the vaporization accumulator 2 and is sent to the compressor 3, and this cycle is repeated to warm the water 12 in the storage tank 11. When the amount of heat collected is small, etc. Since the water temperature in the tank 11 is low, the water 12 above the electric heater basin in the hot water storage tank 11 is almost uniformly heated by natural convection using an electric heater 17 as an external auxiliary heat source to raise it to the target temperature.

Figure 2 shows the temperature rise situation of a hot water storage tank without an auxiliary heat source.
"a" indicates good weather, and "b" indicates bad weather. In this case, heating by solar heat or atmospheric heat raises the temperature of the water in the entire tank from the bottom of the tank, so the rate of temperature rise is slow and it takes a considerable amount of time to reach the required temperature. Figure 3 shows the temperature rise situation when an auxiliary heat source is used. In this case, if the electric heater is installed approximately in the middle of the tank, the water above the electric heater will be further heated. There are problems in that it takes a long time to reach the desired high temperature and requires a large-capacity electric heater.

OBJECTS OF THE INVENTION The present invention solves these conventional problems and aims to maintain the effectiveness as an auxiliary heat source in the best possible state.

Structure of the Invention In order to achieve this object, the present invention provides a sub-tank separately from a hot water storage tack having a main heat source, and an auxiliary heat source is provided at the bottom of the hot water storage tack, and the bottom and top of both the hot water storage tank and the sub-tank are separated from each other. They are connected by piping, and an automatic opening/closing valve is provided between the upper connections. With this configuration, when the water in the sub-tank is boiled to a predetermined temperature by the auxiliary heat source, the boiling point is detected and the automatic on-off valve opens, replacing the low-temperature water in the hot water tank from the bottom and the high-temperature water from the top based on the difference in specific gravity. When the hot water temperature sensor detects that the cold water is being replaced in the sub-tank, the automatic opening/closing valve closes and the water changes between tanks.

In this way, a predetermined high temperature water is stored in the upper part of the hot water storage tank. On the other hand, water is also heated from the main heat source and stored in a hot water storage tank.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described using FIG. 4. In FIG. 4, the same numbers as mentioned above indicate the same members. Heat collector 1, accumulator 2, compressor 3 for solar heat and atmospheric heat
, the heat exchanger 4 and the expansion valve 5, and the refrigerant 7 is connected to the refrigerant pipe 6.
This heat exchanger 4 and hot water storage tank 1 constitute a circulation circuit 8.
A reciprocating pipe 9.10 is provided between the lower part of the sub-tank 18, a water circulation pump 14 is interposed in this pipe, and an electric heater 17 for an auxiliary heat source is provided at the lower part of the sub-tank 18.
Piping 1 connects the lower part and the upper and lower parts of the hot water storage tack 11, respectively.
9.20, an automatic on-off valve 21 is interposed in the upper connection pipe 19, a hot water temperature sensor 22 is provided on the side wall of the sun tank 18, and based on the signal from the hot water temperature sensor 22,
The automatic on-off valve 21 is controlled by a controller 23.

In the second configuration, when the increase in water temperature in the hot water storage tank 11 is low because the amount of heat collected from the sun is small, the electric heater 17 on the side of the sub tank 18 is heated due to being energized, and the temperature inside the sub tank 18 is heated. of water 12 is heated. When the hot water temperature detector 22 detects a predetermined temperature, the electricity to the electric heater 17 is stopped, and the automatic opening/closing valve 21 is opened to determine the specific gravity due to the difference in temperature between the water 12 in the hot water storage tank 11 and the hot water 24 in the sub tank 18. Due to the difference, the low temperature and heavy water 12 in the hot water storage cooker 11 moves from the lower part to the sub tank 18 side, and the high temperature and light specific gravity hot water 24 in the sub tank 18 side circulates to the upper part of the hot water storage tank 11 side. Detecting that low-temperature water 12 has flowed into the electric heater 17
energize, close the automatic on-off valve 21 with a time difference, and d
To prevent convection between a sub tank 18 and a hot water storage tank 11 during pumping up. By repeating this cycle, hot water 24 is sequentially stored in the hot water storage tank 11 from above.

FIG. 5 shows changes in the water temperature within the hot water storage tank 11, and it can be seen that hot water at a constant temperature is maintained between the hot water storage tanks 11. It can be seen that as time passes, the boundary layer between the high-temperature field and the low-temperature water gradually moves to the bottom, and the temperature of the low-temperature water also rises due to solar heat and atmospheric heat.

This embodiment has the following effects.

(1) Since it uses a temperature stratification method, a high temperature field can be constantly extracted.

(2) The upper part of the hot water storage tank is hot and the lower part is cold, and the temperature difference is large, making it easy to maintain temperature stratification.

(3) Heater energization 1ヾ1; stirring of the weak water mixture during heating does not occur, and no temporary drop in the overall high temperature occurs.

(4) Since the low-temperature water in the hot water storage tank is not heated half-heartedly by an electric heater, solar heat can be collected only for the low-temperature water.

Next, another embodiment of the present invention will be described with reference to FIG. The difference from the previous embodiment is that a circulation pump 25 is provided in the connecting pipe 2o between the lower part of the hot water storage tank 11 and the lower part of the sun tank 18. According to this configuration, the high temperature hot water 24 in the safukunku 11 is forcibly removed. Water is sent to the hot water storage tack 11 and automatic opening/closing valve 2
1 and the circulation pot 25 are interlocked, and as the heat transfer cycle is repeated several times, as the high temperature field 24 at the top of the hot water storage tank 11 increases, the amount of water transferred decreases, and the number of times the automatic opening/closing valve operates decreases. Since the amount increases little by little, it is possible to reduce the heater energization stop time and perform efficient boiling.

Effects of the Invention As described above, according to the water heater of the present invention, (1) quick boiling and quick discharging are possible.

(2) It is possible to maintain high temperatures.

(3) Boiling can be achieved using an auxiliary heat source using an electric heater without interference from the unstable and low-level main heat source such as solar heat or atmospheric heat.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram of a conventional water heater with an auxiliary heat source, and Fig. 2 is a relational diagram showing the hot water temperature state without an auxiliary heat source in Fig. 1.
FIG. 3 is a relationship diagram showing the hot water temperature state when the auxiliary heat source in FIG. FIG. 6 is a diagram illustrating a partial configuration of another embodiment of the present invention. 1... Heat collector (main heat source), 4... Heat exchange section, 11... Storage θ tank, 15... Water supply port, 16... ... Hot water outlet, 17 ... Electric heater (auxiliary heat source), 18 ... Saf tank, 21
...Automatic opening/closing valve, 22...Water temperature detector, 2
3...Controller, 25...Name of circulation bottle agent Patent attorney Toshio Nakao and one other person Figure 1. Figure 5

Claims (3)

[Claims] (1) It has a water supply port at the bottom and a hot water outlet at the top, and
It consists of a hot water storage tank having a heat exchange section for the main heat source, and a sub-tank provided with an auxiliary heat source, and the two parts and lower parts of the sub-tank and the hot water storage cook are connected respectively, and the upper part of the hot water storage tank and the sub-tank are connected to each other. A water heater with an automatic on-off valve interposed between connections. (2) The water heater according to claim 1, wherein a high temperature detector is provided on the side wall of the sub-tank, and the automatic opening/closing valve is controlled by this hot water temperature detector. (3) A circulation pump is provided in a circulation circuit between a hot water storage tank and a sub-tank, and a hot water temperature sensor attached to a side wall of the sub-tank controls the nitrification of the circulation pump. Water heater.