JPH06201190A - Composite hot water supplying device and its temperature stabilizing method for hot water to be re-supplied after pause - Google Patents

Abstract

PURPOSE:To supply hot water at a stable temperature with a less temperature fluctuation when hot water is re-supplied by suppressing the cooling of hot water in a hot water supplying heat-exchanger by the wind of a combustion fan, when an additional heating burner performs a combustion during a hot water supplying burner stops its combustion. CONSTITUTION:The periphery of an exhaust air cylinder 20 on the additional heating functional side is surrounded by an air supplying pipe 22, and when an additional heating burner 12 burns, and a combustion fan 3 rotates, air is introduced to a suction port of the combustion fan 3 from the air supplying pipe 22 through an air passage 23. At this time, the temperature of the air is increased by absorbing the heat of the exhaust air cylinder 20, and additional heating heat-exchanger 11 and the burner case of the additional heating burner 12. This air with a high temperature is fed to a hot water supplying heat-exchanger 2 from the combustion fan 3, and the hot water supplying heat-exchanger 2 is back-up-heated, and the radiated portion of heat of the hot water supplying heat-exchanger 2 while a hot water supplying burner 1 stops its combustion is compensated. By this method, the cooling of hot water in the hot water supplying heat-exchanger 2 is suppressed, and hot water with a stable temperature can be re-supplied.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combined water heater provided with a means for stabilizing the hot water temperature at the time of re-hot water, and a method for stabilizing the hot water temperature at re-hot water.

[0002]

2. Description of the Related Art As is well known, a compound water heater having a hot water supply function and other functions such as reheating a bath is widely used. This type of combined water heater has a hot water supply and combustion system in the appliance,
For example, it is equipped with a reheating combustion system such as a bath. The hot water supply combustion system burns the hot water supply burner, heats the hot water supply heat exchanger, turns the water passing through the hot water supply heat exchanger into hot water, and supplies the hot water to a desired hot water supply place such as a kitchen.

On the other hand, the reheating combustion system is provided with a reheating burner, and by heating the reheating burner, the reheating heat exchanger is heated, and the circulating water flow of the hot water passing through the reheating heat exchanger is heated, It is used to reheat hot water. This type of combined water heater is provided with a separate or shared combustion fan for supplying / exhausting air that feeds air to the hot water supply burner and the reheating burner.

[0004]

In this type of combined water heater, when the hot water supply burner is burned to use the hot water of the hot water supply heat exchanger, the faucet is closed and the hot water discharge is stopped, the hot water supply burner stops burning. However, the inside of the hot water supply heat exchanger is filled with hot water. When the hot water in the bathtub is reheated by the combustion of the reheating burner of another function of the reheating combustion system while the hot water supply is stopped, the air is generated by the rotation of the combustion fan in the equipment using a common combustion fan. Is also supplied to the hot water supply heat exchanger and the temperature of the hot water in the hot water supply heat exchanger decreases.

Even in an appliance in which a hot water supply burner and a reheating burner are provided with individual combustion fans, when the reheating operation is performed while hot water supply is stopped, combustion on the hot water supply burner side is performed to prevent recirculation of exhaust gas. Since the fan also rotates, the air from the combustion fan passes through the hot water supply heat exchanger, so that a cooling action occurs and the temperature of the hot water in the hot water supply heat exchanger decreases. As described above, when the temperature of the hot water in the hot water supply heat exchanger cools due to the operation of the reheating combustion system, when the tap is opened again and hot water is re-exposed, the cold water in the hot water supply heat exchanger has a low temperature. After the discharge of hot water, the hot water of the set temperature changes due to the combustion of the hot water supply burner, and the fluctuation of the hot water temperature at the time of hot water re-discharging becomes large, causing a problem that the user of the hot water feels uncomfortable.

The present invention has been made in order to solve the above-mentioned conventional problems, and an object thereof is to prevent hot water in the hot water heat exchanger from rotating due to the rotation of the combustion fan accompanying the combustion of another function such as a reheating combustion system. It is an object of the present invention to provide a combined water heater that does not cause a large change in hot water temperature when it is cooled again, and a method for stabilizing the hot water discharge again.

[0007]

In order to achieve the above object, the present invention is constructed as follows. That is, a first aspect of the present invention is a composite water heater including a hot water heat exchanger heated by a hot water burner and a combustion system of a burner having a different function other than hot water, which absorbs heat accompanying combustion of the burner having a different function. It has a backup heating means for adding the absorbed heat to the hot water supply heat exchanger which is not in operation. A second aspect of the present invention is a hot water supply heat exchanger heated by a hot water supply burner, and a method for stabilizing re-outflow hot water temperature of a combined hot water supply device including a combustion system of a burner having a function other than hot water supply. When the burner burns while the other-function burner is not operating, it absorbs the heat associated with the combustion of the other-function burner, adds the absorbed heat to the hot water heat exchanger, and heats the hot water when the hot water heat exchanger is not operating. It is configured to suppress the cooling of hot water in the exchanger.

[0008]

In the present invention having the above-described structure, when the hot water from the hot water heat exchanger is stopped, if the burner of the other function burns, the heat from the combustion fan is received and the heat exchanger radiates heat.
The temperature of the hot water in the heat exchanger tends to decrease, but at this time, the heat generated by the combustion of the other function burner is added to the hot water heat exchanger by the operation of the backup heating means, and the heat released by the wind of the combustion fan is dissipated. Only by the heating of the backup heating means, the heat is supplemented, the cooling of the hot water in the hot water supply heat exchanger is suppressed, and the stable hot water with little fluctuation in hot water temperature can be discharged at the time of the next re-hot water heating.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a first embodiment of the composite water heater according to the present invention. In FIG. 1, this combined water heater is provided with a hot water supply function and a reheating function. A hot water supply heat exchanger 2 is arranged above the hot water supply burner 1 on the hot water supply function side and below the hot water supply burner 1. Is provided with a combustion fan 3 for supply and exhaust.

A water supply pipe 4 is provided on the inlet side of the hot water supply heat exchanger 2.
The water supply pipe 4 is provided with a water supply temperature sensor 5 for detecting the water supply temperature and a water amount sensor 6 for detecting the water supply amount. A hot water supply pipe 7 is connected to an outlet side of the hot water supply heat exchanger 2, and the hot water of the hot water supply heat exchanger 2 is guided to a desired place such as a kitchen by the hot water supply pipe 7. The hot water supply pipe 7 is provided with a hot water outlet temperature sensor 8 for detecting the hot water supply temperature. The hot water supply heat exchanger 2 is provided with a bypass passage 10 in parallel, and the hot water discharged from the hot water supply heat exchanger 2 is mixed with the water flowing through the bypass passage 10 and discharged from the faucet 9 of the hot water supply pipe 7. It is supposed to be done.

A reheating burner 12 is provided below the reheating heat exchanger 11 on the reheating function side, and air is sucked into the reheating burner 12 by the combustion fan 3 common to the hot water supply side. Alternatively, it is supplied by a push-in type (not shown).

A pipe line 13 is provided on the inlet side of the reheating heat exchanger 11.
Connected to the discharge side of the circulation pump 14 via
The suction side of 14 is connected to a bath 16 via a return pipe 15. Further, a forward pipe 17 is connected to the outlet side of the reheating heat exchanger 11, and a front end side of the forward pipe 17 is connected to the bath 16. The return pipe 15, circulation pump 14, reheating heat exchanger 11 and forward pipe
The pipeline that passes through 17 and reaches the bathtub 16 constitutes a reheating circulation pipeline 18.

The upper side of the reheating heat exchanger 11 is an exhaust port.
40, and the exhaust stack 20 is connected to this exhaust port 40,
Exhaust gas from the reburning burner 12 is exhausted to the outside through the exhaust stack 20.

A characteristic of this embodiment is that the backup heating means 21 is provided between the hot water supply function side and the reheating function side.
Is provided. This backup heating means 21
The exhaust pipe 20 is surrounded by an air supply pipe 22 to form a double pipe for exhaust gas and air supply. Further, the lower portion of the air supply pipe 22 is formed into a case, and a reheating heat exchanger 11 and a burner for a reheating burner 12 are provided. The case 19 is enclosed, the outlet side is made cylindrical and faces the suction port of the combustion fan 3, and the passage extending from the air supply pipe 22 to the combustion fan 3 serves as an air supply passage 23. A structure in which the air introduced from the trachea 22 is brought into contact with the exhaust stack 20, the reheating heat exchanger 11 and the burner case 19 to absorb the heat of the reheating combustion system and guide the warmed air to the suction side of the combustion fan 3. Has become.

The operation control of combustion of the hot water supply burner 1 and the reheating burner 12 and the rotation of the combustion fan 3 in this embodiment is performed by a control device (not shown).

This embodiment is constructed as described above. Next, the stabilizing operation of the temperature of the re-exposed hot water by the backup heating means 21 will be described. Hot water supply burner 1 during hot water supply operation
Of the water is introduced into the hot water supply heat exchanger 2 through the bypass passage 10 at the outlet side of the hot water supply heat exchanger 2. The water is mixed with the incoming water, and hot water having a set temperature, for example, 40 ° C. is produced by this mixing and is supplied to a desired hot water supply place via the hot water supply pipe 7. Then, when the faucet 9 is closed and the combustion of the hot water supply burner 1 is stopped, and in the standby state for the next re-hot water, the operation of the reheating function side starts, and the combustion fan burns with the combustion of the reheating burner 12. When 3 is rotated, the wind of this combustion fan 3 hits the hot water supply heat exchanger 2. The air introduced into the combustion fan 3 passes through the air supply pipe 22,
It absorbs the heat of the exhaust gas from the combustion of the reheating burner 12 from the exhaust stack 20, and further passes around the burner case 19 of the reheating heat exchanger 11 and the reheating burner 12 to absorb the heat and burn the combustion fan. Since it is guided to the suction port of 3,
The air introduced into this fan has been sufficiently warmed up by absorbing the heat from the reheating function side, and since this warmed air passes through the hot water supply heat exchanger 2, the backup heating of the hot water supply heat exchanger 2 is performed. Done. As a result, cooling of the hot water in the hot water supply heat exchanger 2 due to heat radiation from the hot water supply heat exchanger 2 while the hot water supply is stopped is suppressed.

In this embodiment, for example, when the water in the bypass passage 10 and the hot water discharged from the hot water supply heat exchanger 2 are mixed at a ratio of 2: 8, the temperature of the water entering through the water supply pipe 4 is set to 15 ° C.
In this case, the temperature of the hot water in the hot water supply heat exchanger 2 is about 46.2 ° C. in order to let the hot water having the set temperature of 40 ° C. exit from the faucet 9. While the operation of the hot water supply heat exchanger 2 is stopped, the decrease of the hot water temperature due to the cooling of the hot water supply heat exchanger 2 falls within the allowable temperature range, for example, the set temperature of 40 ° C.
On the other hand, in order to keep the temperature within the range of -3 ° C, it is necessary to keep the hot water supply heat exchanger 2 at 42.5 ° C or higher. For this purpose, it is necessary to set the supply air temperature of the combustion fan 3 to about 40 ° C. In the present embodiment, based on the above examination results, the air supply passage is controlled so that the temperature of the air introduced into the air supply port of the combustion fan 3 becomes about 40 ° C.
The supply air temperature of the combustion fan 3 is controlled by setting the passage area of 23 or providing a bumper (not shown) for opening and closing the passage area in the air supply passage 23 and controlling the opening / closing amount of the bumper. I'm trying to reach ℃.

According to this embodiment, even if the reheating function side operates while the operation of the hot water supply heat exchanger 2 is stopped and the combustion fan 3 is rotated, the cooling of the hot water supply heat exchanger 2 from the combustion fan 3 is performed. Cooling of the hot water in the hot water supply heat exchanger 2 is prevented by supplying the restrained warm air. As a result, when the faucet 9 is opened and hot water is discharged again, the hot water in the hot water supply heat exchanger 2 that has been kept warm is mixed with the water in the bypass passage 10 side, so that the temperature is within the allowable temperature range with respect to the set temperature. The hot water comes out, and then the hot water of the set temperature comes out by the combustion of the hot water supply burner 1, so that the fluctuation of the hot water temperature at the time of the hot water re-firing is very small, and the hot water user does not feel uncomfortable. You can comfortably use hot water.

FIG. 2 shows the experimental results showing the effect of stabilizing the temperature of the re-spout hot water of this embodiment in comparison with the conventional example. In this experiment, room temperature was 22 ° C, water temperature was 17 ° C, set temperature was 40 ° C, and hot water discharge rate was 12 liters / min. (B) shows the result of the conventional example, (a) of the same figure shows the temperature of the hot water supply pipe immediately after the outlet of the hot water supply heat exchanger, and (b) of the same figure shows the hot water supply temperature after mixing. . In addition, (c) and (d) in FIG.
Shows the result of this embodiment, (c) of the figure shows the temperature of the hot water supply pipe immediately after the outlet of the hot water supply heat exchanger 2, and (d) of the figure shows the hot water supply temperature after mixing.

As is clear from the results of this experiment, in this embodiment, the backup heating means 21 operates so that the temperature drop of the hot water supply pipe after the hot water supply is stopped is smaller than that in the conventional example. Although the undershoot of the hot water temperature at the time of re-hot water was large, the undershoot disappeared in this example, and it was possible to re-hot water with stable hot water temperature with small fluctuation of hot water temperature. It has been proved by experiments.

FIG. 3 shows a second embodiment of the present invention. In this embodiment, the upper heating chamber 21 of the reheating heat exchanger 11 and the lower hot water supply side combustion chamber of the hot water supply heat exchanger 2 are connected by a duct 25 to form a backup heating means 21. . The exhaust chamber 24 is provided with a bumper 26 that selectively opens and closes the inlet side of the exhaust pipe 20 and the inlet side of the duct 25. When the hot water supply burner 1 is burning, the bumper 26 is used to open the inlet side of the duct 25. Closed, hot water supply burner 1
When the reheating burner 12 burns when the combustion is stopped, the exhaust gas of the reheating burner 12 is passed through the duct 25 by closing the inlet of the exhaust stack 20 (or controlling the closing amount) by the bumper 26. The hot water supplied to the hot water heat exchanger 2 is guided to the hot water hot water heat exchanger 2 for back-up heating by this exhaust gas to prevent heat radiation from the hot water heat exchanger 2 during combustion stoppage of the hot water burner 1 to prevent hot water in the hot water heat exchanger 2 It is intended to suppress the coldness of.

The heating of the hot water in the hot water supply heat exchanger 2 is carried out by the heating by the exhaust gas, and when the hot water is next re-opened by opening the faucet 9, the setting is performed as in the first embodiment. Since hot water within a permissible range with respect to temperature comes out, hot water with a stable hot water temperature with a small fluctuation in hot water temperature can be discharged.

FIG. 4 shows a third embodiment of the present invention. In this embodiment, an air supply port 28 is provided on the wall surface of the appliance case 27 on the reheating function side, and when the combustion fan 3 rotates, the air taken in from the hot water supply port 28 is an exhaust port on the reheating function side, and a reheating heat exchange. The backup heating means 21 is configured so as to reach the suction port of the combustion fan 3 while absorbing the heat of the burner case 19 of the vessel 11 and the reheating burner 12. Also in this embodiment, when the reheating function side operates while the hot water supply burner 1 is in the combustion stopped state, the heat that accompanies the combustion of the reheating function burner 12 on the reheating function side is absorbed to burn the air introduced from the air supply port 28. Since it is guided to the fan 3, the hot water supply heat exchanger 2 is backed up and heated by the warm air sent from the combustion fan 3, and the cooling of the hot water in the hot water supply heat exchanger 2 while the combustion of the hot water supply burner 1 is stopped is suppressed,
Similar to each of the above-mentioned embodiments, it is possible to re-emit hot water of stable hot water temperature with small fluctuation of hot water temperature.

FIG. 5 shows a fourth embodiment of the present invention. In this embodiment, a heat conduction plate 30 for transmitting the heat of the exhaust gas of the exhaust pipe 20 to the hot water supply heat exchanger 2 is provided as a backup heating means 21 between the exhaust pipe 20 on the reheating function side and the hot water supply heat exchanger 2. It was done. Also in this embodiment, when the reheating side operates while the hot water supply burner 1 is stopped, the heat of the reheating function side is added to the hot water heat exchanger 2 to heat the combustion fan 3
It is possible to compensate for the amount of heat radiated by the hot water supply heat exchanger 2 in response to the wind caused by the rotation of the hot water, and to prevent fluctuations in the hot water temperature during re-hot water discharge, as in the above-described embodiments.

FIG. 6 shows a fifth embodiment of the present invention. In this embodiment, the reheating heat exchanger 11 and the hot water supply heat exchanger 2 serve as a backup heating means 21 and a heat conduction plate 31.
Are connected using. Also in this embodiment, even if the reheating function side operates while the combustion of the hot water supply burner 1 is stopped and the combustion fan 3 rotates, the heat that supplements the heat released from the hot water supply heat exchanger 2 by the wind of the combustion fan 3 is the reheating burner 12 Is added to the hot water supply heat exchanger 2 side from the reheating heat exchanger 11 side, so that the cooling of the hot water in the hot water supply heat exchanger 2 is suppressed,
As in each of the above-described embodiments, it is possible to suppress fluctuations in the re-outflow hot water temperature and to discharge hot water at a stable hot water temperature without undershoot.

The present invention is not limited to the above-mentioned embodiments, and various embodiments can be adopted. For example, in each of the above-described embodiments, the case of the reheating function is described as an example of another function, but the present invention is also applied to a combined water heater having a hot water supply function and a gas heating function in parallel.

Further, in each of the above-mentioned embodiments, the combined water heater using gas as fuel has been described, but the combined water heater using oil as fuel may be used.

Further, in each of the above embodiments, the bypass passage 10
Although the description has been given with an example in which the hot water on the hot water supply heat exchanger 2 side is mixed with the water on the bypass passage 10 side, a composite hot water supply device having a mixing device of another configuration may be used. Also,
A connection pipe connecting the hot water supply pipe 7 and the circulation pipe 18 may be provided, or another bypass passage connecting the water supply pipe 4 and the circulation pipe 18 may be provided.

Further, the bypass passage 10 in each of the above embodiments is omitted, and the hot water produced by the hot water heat exchanger 2 is directly supplied to the hot water supply pipe 7.
The hot water may be discharged from the faucet 9 through.

[0030]

The present invention is provided with a backup heating means for absorbing the heat generated by the combustion of the burner having another function and adding the absorbed heat to the hot water supply heat exchanger which is not in operation. The backup heating means compensates for the heat generated by the rotation of the combustion fan when the burner burns and the heat radiated by the hot-water supply heat exchanger due to natural air cooling, which makes it possible to suppress the cooling of the hot water in the hot-water supply heat exchanger. In addition, it is possible to suppress the undershoot of the hot water temperature at the time of re-hot water and to make hot water having a stable hot water temperature again.

[Brief description of drawings]

FIG. 1 is a configuration explanatory view showing a first embodiment of the present invention.

FIG. 2 is a graph of experimental results showing the effect of the present embodiment in comparison with the conventional example.

FIG. 3 is a configuration explanatory view showing a second embodiment of the present invention.

FIG. 4 is a structural explanatory view showing a third embodiment of the present invention.

FIG. 5 is a configuration explanatory view showing a fourth embodiment of the present invention.

FIG. 6 is a structural explanatory view showing a fifth embodiment of the present invention.

[Explanation of symbols]

 2 Hot water supply heat exchanger 3 Combustion fan 11 Reheating heat exchanger 12 Reheating burner 21 Backup heating means 23 Air supply passage 25 Duct 28 Air supply port 30, 31 Heat conduction plate

Claims (2)

[Claims] 1. A combined water heater comprising a hot water heat exchanger heated by a hot water burner and a combustion system of a burner having a different function other than hot water, and absorbs heat accompanying combustion of the burner having a different function, and absorbs the heat. A composite water heater having backup heating means for applying the generated heat to a hot water heat exchanger that is not operating. 2. A hot water supply heat exchanger heated by a hot water supply burner, and a method for stabilizing the hot water supply heat exchanger in which the hot water supply heat exchanger is provided with a combustion system for a burner having a function other than hot water supply. When the other-function burner is being burned in, the heat generated by the combustion of the other-function burner is absorbed, and the absorbed heat is added to the hot water heat exchanger, and the hot water heat exchanger inside the hot water heat exchanger is stopped. Method for stabilizing the temperature of re-outflow hot water of a compound water heater that suppresses the cooling of hot water.