JP2001201179A - Hot water supplier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hot water supplier which can fully make the its use even at additional stoking of a bath. SOLUTION: A hot water supply water pipe 42 and a bath additional stoking water pipe 43 are arranged, meandering as shown each in figure on a hot water supplier 41. These are twined as shown in figure (c), and the space is filled up with a brazing material having superior thermal conductivity. Therefore, even if the hot water supply pipe 42 is heated at additional stoking of the bath, the heat is conducted to the bath additional stoking water pipe 43, and is taken away by bath water. Therefore, the hot water supply pipe 42 is not overheat, so this hot water supplier can raise the additional stoking capacity of the bath by that amount.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a one-can, two-channel hot water supply system in which a hot water supply and a reheating of a bath are performed by a heat exchanger with a heat source, and a reheating and heating of a hot water supply and a bath by one heat source. The present invention relates to a one-can-three-channel hot water supply system performed by an attached heat exchanger.

[0002]

2. Description of the Related Art A one-can-two-canal hot-water supply system uses a single heat source heat exchanger for heating water for supplying water to a bath or a hot water supply system and heating for reheating a bath. In the one-can-three-channel hot water supply system, hot water supply, reheating of a bath and heating are shared by one heat exchanger with a heat source. These are increasingly used for the purpose of cost reduction and downsizing of facilities. Here, the heat exchanger with a heat source exchanges heat with a heat source such as combustion heat of gas or the like, or electric heating.

[0003] Fig. 8 shows a system configuration diagram of an example of a one-can, two-channel hot water supply system. When supplying hot water to a hot water supply pipe such as a kitchen in addition to a hot water supply pipe 1 and a shower 2 used in a bath, when the faucet is opened, water is supplied from the water supply source pipe into the heat exchanger 3 via the hot water supply pipe 4. Is done. Then, the water amount sensor 5 detects the flow of the water and ignites the gas burner 6 of the heat exchanger 3. The heated hot water is supplied through a flow control valve 7 to a hot water outlet pipe 1, a shower 2, or another hot water supply pipe. A fixed bypass 8 is provided to cool the hot water heated by the heat exchanger 3 to an appropriate temperature.

[0004] A bypass control valve 9 and a flow rate control valve 7 are provided for finally controlling the temperature of the supplied hot water. The supply water temperature is detected by the incoming water thermistor 10, and the temperature of hot water at the outlet of the heat exchanger 3 is detected by the heat exchange thermistor 11. Then, the temperature of the finally supplied hot water is detected by the tapping thermistor 12. The control device in the electrical board 13 adjusts the flow control valve 7 and the bypass control valve 9 based on the detected temperature of each of these thermistors, and further operates the switching electromagnetic valve 14 of the gas burner 6, thereby The temperature of the supplied hot water is controlled to a set temperature.

When hot water is supplied to the bathtub 15, the pouring solenoid valve 1
6 is open. Then, the water from the water supply source pipe is heated to the set temperature by the same mechanism as that described above for supplying hot water to the tapping pipe 1, the shower 2, and the hot water supply pipe. The recirculating piping 18 for the bath is supplied to the recirculating piping 18 via the pipe 17, and is supplied to the bathtub 15 through the recirculating piping 18 for the reheating by flowing backward from the water flow switch 19 to the circulation pump 20. (Some are circulation piping 1 for reheating.
After flowing through the heat exchanger 3 again to the heat exchanger 3 side, the water is supplied to the bathtub 15 after passing through the heat exchanger 3. Then, when the amount of hot water measured by the water amount sensor 5 reaches the set value, the hot water supply is stopped.

When the bath is to be reheated, the circulation pump 20 is operated, and the hot water in the bathtub 15 is reheated.
Circulate through 8. The hot water in the circulation pipe 18 for reheating is
It is heated in the heat exchanger 3 and returns to the bathtub 15 again. The temperature of the hot water in the bathtub 15 is detected by the bath thermistor 21,
Reheating is performed until this reaches the set temperature. The ignition control of the gas burner 6 in the heat exchanger 3 is performed after confirming the operation of the circulation pump 20. The check valve 17 is provided to prevent the hot water in the additional heating circulation pipe 18 from flowing to the hot water supply pipe 4 side.

The ignition control of the gas burner 6 in the heat exchanger 3 is performed as follows. When the amount of flowing water detected by the water amount sensor 10 is equal to or more than a predetermined value, or when the circulation pump 20 is activated and the water flow switch 19 is turned on, after confirming safety in a predetermined safety circuit, the combustion fan 22 Is activated, the main solenoid valve 23 is opened, and ignition control by the spark plug is performed. The proportional valve 24 adjusts and controls the gas amount according to the required hot water supply amount. Thereby, the gas is burned in the gas burner 6.

The switching solenoid valve 14 is used to burn only a part of the gas burners 6 when the temperature of the hot water becomes too high when burning the gas corresponding to the burner capacity.
The combustion exhaust gas is discharged outside the heat exchanger by the combustion fan 22. A CO sensor 25 is provided in the exhaust path,
It is used to detect incomplete combustion of the gas burner 6 and shut off the combustion.

The hot water supply to the bathtub 15 and the reheating are performed by the control device in the electric board 13 in accordance with the set values set by the remote control device 26. Note that 2 in FIG.
7 is a check valve for preventing water in the hot water supply pipe 4 from flowing back to the water supply source pipe side, 28 is a pouring confirmation switch, 29 is a faucet-
Shower switching lever, 30 is a nozzle holder, 31 is a blow valve.

There are various types of one-can three-channel hot water supply systems, and a typical one is a hot water supply pipe in a heat exchanger (heat exchanger with a heat source) in which gas combustion is performed. Heating of the heating water pipe and heating of the water pipe for heating, the heating of the water pipe for bath reheating is performed by using a heat exchanger (heat exchanger without a heat source) separate from the heat exchanger in which gas combustion is performed. This is a method in which the heat is exchanged in the piping for bath reheating.

In such a system, when only the reheating of the bath is performed without heating, the hot water in the piping for heating is circulated without supplying the heating equipment, and only the heating of the reheating bath is performed. In addition, a system in which each of a hot water supply pipe, a heating pipe, and a bath reheating pipe is heated in a heat exchanger in which gas combustion is performed may be considered. In any case, when supplying hot water to the bath,
As in the can-two-channel hot water supply system, the hot water in the hot water supply pipe is supplied to the reheating pipe through a pouring valve.

In such a hot water supply apparatus for reheating a bath and supplying hot water with a single heat exchanger, a water pipe for supplying hot water and a water pipe for reheating the bath are usually arranged in parallel in the heat exchanger. Water pipes arranged in two stages and supplying hot water are arranged on the side close to a heat source (for example, a gas burner). This is because the degree of temperature rise for hot water supply is greater than that for reheating the bath. In particular, in the case of heating by combustion of gas or the like, fins are attached to the water pipe in order to increase the efficiency of heat transfer to the water pipe, and usually, the reheating water pipe of the bath and the hot water supply pipe are common fins. Are combined.

[0013]

In the hot water supply apparatus having the above-described structure, both water pipes are heated even when only one of the additional heating and the hot water supply is performed.
Even if the reheating water pipe of the bath is heated when the hot water is supplied and the reheating of the bath is not performed, no problem occurs because the heat escapes into the bath through the reheating water pipe of the bath. The water tube of the vessel is designed so that even if the bath is empty and the reheating water tube is empty, there is no problem in terms of heat resistance.)

[0014] However, when the reheating of the bath is performed and hot water is not supplied, the water in the hot water supply pipe is overheated, and then when the hot water tap is opened, there is a possibility that the hot water blows out of the hot water tap. is there. Therefore, in order to prevent such a situation, when performing reheating of the bath, measures such as reducing the amount of gas combustion are taken. Therefore, there is a problem that the reheating capacity of the bath is limited, and the capacity of the hot water supply device cannot be fully utilized.

The present invention has been made in view of such circumstances, and it is an object of the present invention to provide a hot water supply apparatus that can make full use of its ability even when reheating a bath.

[0016]

A first means for solving the above-mentioned problem is a hot water supply apparatus for performing hot water supply and reheating of a bath in one heat exchanger, wherein at least a bath is provided in the heat exchanger. Hot water supply having a structure in which a water pipe in the last row of a reheating water pipe and a hot water supply pipe are tied together, and a gap formed when the water pipes are tied is filled with a substance having a good heat transfer coefficient. An apparatus (claim 1).

Although the reheating water pipe and the hot water supply pipe of the bath are provided in parallel in the upper and lower stages as described above, it has been conventionally practiced to tie these water pipes to improve the heat transfer between them. I have. However, since both water tubes are circular or elliptical, the contact area is small and the heat transfer coefficient is small. In this means, the gap formed when the two water pipes are joined together is filled with a substance having a high heat transfer rate, so that the heat transfer rate between the two water pipes is increased.

Therefore, even if the hot water supply pipe is overheated during the reheating of the bath, the heat is transmitted to the reheating water pipe of the bath and is carried by the reheating water. Therefore,
The degree of overheating of the hot water supply pipe is reduced, and the heat from the heat source can be increased accordingly. The hot water pipe is most likely to be overheated in a portion where the temperature of the hot water pipe of the bath is the highest, that is, in the heat exchanger, the hot water pipe near the water pipe in the last row of the hot water pipe of the bath. Therefore, when tying only a part of the water pipe, it is preferable to give priority to this part.

Needless to say, in the claims and in the section of the means for solving the problems, the term "bath reheating water pipe" refers to a one-can three-water-channel type. This includes water pipes shared for bath reheating and heating.

A second means for solving the above-mentioned problem is as follows.
This is a hot water supply device that performs hot water supply and bath reheating with a single heat exchanger, and has a structure in which a single reheating water pipe and two hot water supply pipes are tied in a heat exchanger. A hot water supply device (Claim 2).

In this means, since the reheating water pipe of one bath and the two hot water supply pipes are tied together, the amount of heat transfer from the hot water supply pipe to the reheating water pipe of the bath is increased. Therefore, the degree of overheating of the hot water supply pipe is reduced, and the heat from the heat source can be increased accordingly.

A third means for solving the above-mentioned problem is:
A hot water supply apparatus for performing hot water supply and bath reheating with a single heat exchanger, wherein the flow of hot water in the last row of the reheating water pipe of the bath and the flow of hot water in the hot water supply pipe are reversed in the heat exchanger. A hot water supply apparatus having a structure in which a water pipe in a last row of a reheating water pipe and a water pipe in a first row of hot water supply pipes are joined together (claim 3).

In this means, the hottest part of the bath reheating water pipe is tied to the coldest part of the hot water supply pipe, and the coldest part of the bath reheating water pipe is connected to the hottest water pipe. It is tied to the hottest part of the hot water pipe. Therefore, since the temperature gradient of the most heated portion of the hot water supply pipe and the temperature of the reheating water pipe of the bath corresponding to that part is large, the heat transfer coefficient increases, and the amount of heat transfer from the hot water supply pipe to the reheating water pipe of the bath is increased. More. Further, since the water temperature in the hot water supply pipe is low, the temperature does not increase even if the water is heated. Therefore, the degree of overheating of the hot water supply pipe is reduced, and the heat from the heat source can be increased accordingly.

A fourth means for solving the above-mentioned problem is:
The second means or the third means, wherein a portion of a gap formed when the water pipes are tied is filled with a substance having a high heat transfer coefficient (Claim 4).

In the present means, for the same reason as described in the description of the first means, the heat transfer rate from the hot water supply pipe to the reheating water pipe of the bath is increased, and the heat transfer rate from the hot water supply pipe to the reheating water pipe of the bath is increased. The amount of heat transfer increases. Therefore, the degree of overheating of the hot water supply pipe is reduced, and the heat from the heat source can be increased accordingly.

A fifth means for solving the above-mentioned problem is a hot water supply apparatus for performing hot water supply and bath reheating with a single heat exchanger, wherein a two-stage bath reheating water pipe and a hot water supply pipe are provided in the heat exchanger. And the fins are connected by fins, wherein the height of the fins on the water tube side of the last row of the reheating water pipe of the bath is smaller than the height of the fins on the first row side. Claim 5).

In this means, since the height of the fins on the water pipe side in the last row of the reheating water pipe of the bath is made smaller than the height of the fins on the first row, the temperature of the reheating water pipe in the bath is the highest. The heat transfer from the heat source in this high portion is reduced. Therefore, the degree of overheating of the hot water supply pipe is reduced. Therefore, the degree to which the hot water pipe is overheated is reduced,
The heat from the heat source can be increased accordingly.

Sixth means for solving the above-mentioned problems is as follows.
In a hot water supply apparatus for performing hot water supply and bath reheating with a single heat exchanger, in which a bath reheating water pipe and a hot water supply pipe are arranged in two stages in a heat exchanger and connected by fins, A hot water supply apparatus (claim 6), wherein the diameter of the reheating water pipe of the bath in the exchanger is increased as it goes to the last row.

In this means, since the diameter of the reheating water pipe of the bath in the heat exchanger is increased as it goes to the last row, the hot water supply pipe is heated as the temperature of the reheating water pipe of the bath rises. The heat transfer area can be increased. Therefore, since the amount of heat transfer from the hot water supply pipe to the reheating water pipe of the bath increases, the degree of overheating of the hot water supply pipe is reduced, and the heat from the heat source can be increased accordingly.

A seventh means for solving the above-mentioned problem is as follows.
In a hot water supply apparatus for performing hot water supply and bath reheating with a single heat exchanger, in which a bath reheating water pipe and a hot water supply pipe are arranged in two stages in a heat exchanger and connected by fins, A hot water supply apparatus according to claim 7, wherein the diameter of the hot water supply pipe in the exchanger is reduced toward the last row of the reheating water pipe in the bath.

In this means, the diameter of the hot water supply pipe in the heat exchanger is reduced as it goes to the last row side of the reheating water pipe of the bath. Even if the amount of heat transfer from the hot water supply pipe to the reheating water pipe of the bath is small, the hot water supply pipe will not be overheated. Therefore, the heat from the heat source can be increased accordingly. This means is more effective when used in combination with the sixth means.

Eighth means for solving the above-mentioned problem is:
A hot water supply apparatus for performing hot water supply and bath reheating with a single heat exchanger, in which a bath reheating water pipe and a hot water supply pipe are arranged in two stages in the heat exchanger,
A hot water supply apparatus according to claim 8, wherein at least a water pipe in the last row of the reheating water pipe of the bath is arranged on a side close to the heat source.

As described in the section of the prior art, the hot water supply pipe is usually arranged closer to the heat source. However, in this means, at least the water pipe in the last row of the reheating water pipe of the bath is arranged on the side close to the heat source.
Therefore, since the hot-water supply pipe is far from the heat source at a position where the temperature of the reheating water pipe in the bath is high, the degree of overheating of the hot-water supply pipe is reduced, and the heat from the heat source can be increased accordingly. Of the reheating water pipes for the bath, only one in the last row may be arranged close to the heat source, or several rows before it may be arranged. However, since a hot water supply pipe requires more heat, it is not preferable to install a reheating water pipe of a majority of baths close to a heat source.

A ninth means for solving the above-mentioned problem is:
A gas water heater that performs hot water supply and bath reheating with a single heat exchanger, in which the reheating water pipe for the bath and the hot water supply pipe are arranged in two stages in the heat exchanger, and the water pipe and the burner are arranged in parallel. And a function of reducing the amount of combustion of a predetermined number of burners on the last row side of the reheating water pipe of the bath during the reheating combustion of the bath (Claim 9). .

In the conventional gas hot water supply apparatus, the arrangement of the water pipes and the arrangement of the burners are arranged so as to be orthogonal to each other. In this means, the water pipe and the burner are arranged in parallel, so that the amount of combustion of a predetermined number of burners on the last row side of the reheating water pipe of the bath during the reheating combustion of the bath is reduced. Therefore, on the hot water supply pipe side, which is most likely to be overheated and corresponds to the last row of reheating water pipes in the bath, the amount of combustion of the burner is reduced, so that overheating of this portion can be prevented. As a method of reducing the amount of combustion, the amount of gas supplied to the burner in this portion may be reduced, or the burner in this portion may be intermittently burned. It is needless to say that the term “at the time of post-combustion combustion of a bath” includes a time when heating is performed in a one-can three-channel water heater.

[0036]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings. The target of this embodiment is
This is a hot water supply device having a structure as shown in FIG. 8, and its operation is the same as that described in the prior art. In the following figures, the water pipe part of the heat exchanger provided at the upper part of the water heater will be described. FIG. 1 is a view showing a first embodiment of the present invention, in which (a) is a plan sectional view (BB sectional view) of a hot water supply apparatus, and (b) is a longitudinal sectional view (A- A) It is sectional drawing, (c) is a detailed explanatory view of a water pipe. In FIG.
41 is a hot water supply device, 42 is a hot water supply pipe, 43 is a hot water supply pipe, 44 is a fin, and 45 is a brazing material.

Above the hot water supply device 41, a hot water supply pipe 42 and a hot water supply pipe 43 are arranged in a horizontal direction by folding back as shown in the figure. On the lower side, that is, on the side closer to the burner, a hot water supply pipe 42 is provided, and on the upper side, a bath water heating pipe 43 is provided. These are tied together as shown in FIG. is there.
Fins 44 are provided in common for the hot water supply pipe 42 and the hot water supply pipe 43, so that the heat of combustion from the burner can be efficiently transmitted to these water pipes.

This embodiment differs from the conventional example in that
As shown in (c), the brazing material 45 is provided in the gap between the hot water supply pipe 42 and the hot water supply pipe 43. In this example, a metal brazing material 45 is used.
However, any material may be used as a material for filling the gap, as long as it has heat resistance, is not easily deformed by heat, and has a good thermal conductivity. Thereby, even if the hot water supply pipe 42 is heated during the bath reheating operation, the heat is efficiently transmitted to the bath reheating water pipe, and is removed by the bath water. Therefore, overheating of the hot water supply pipe 42 can be prevented, and the amount of combustion of the burner at the time of bath reheating can be increased by that amount, and the reheating capability can be increased.

In this embodiment, all the hot water supply pipes 42 in the hot water supply apparatus and the bath reheating water pipe 43 are tied together and the gap is filled with the brazing material 45. The gap may be filled with the brazing material 45 by tying only the last row of water pipes having the highest temperature. How many water pipes including the last row of bath water pipes are tied together and the gap is filled with the brazing material 45 is a design matter of the hot water supply apparatus and can be appropriately determined by a person skilled in the art.

FIG. 2 shows an example of how the hot water supply pipe 42 and the hot water supply pipe 43 are tied together. In each of these, the hot water supply pipe 42 is divided into two pipes, and the heat transfer area is increased by that amount. In the following drawings, the same reference numerals are given to the components shown in the preceding drawings in the section of the embodiment of the invention, and the description thereof may be omitted.

(A) is a diagram in which two hot water supply pipes 42 are provided vertically above and below a bath water pipe 43, and the space between them is filled with a brazing material 45. (b) combines two hot water supply pipes 42 and one bath reheating water pipe into a triangle,
A gap formed at the center thereof is filled with a brazing material 45. It is more effective to fill not only the gap formed at the center but also the gap formed on the outside of the hot water supply pipe 42 and the hot water supply pipe 43 as in FIG.

(C) is a diagram in which the hot water supply pipe 42 is deformed into a crescent shape as shown in the figure, and the two hot water supply pipes 42 are brazed to the bath post-heating water pipe 43 with a brazing material 45. The heat transfer coefficient is increased by increasing the contact area between the water pipe 43 and the bath water. (d) is similar to (c), in which the hot water supply pipe 42 is deformed into a crescent shape as shown in the figure, and the two hot water supply pipes 42 are brazed to the bath reheating water pipe 43 with a brazing material 45. Hot water supply pipe 42 and hot water supply pipe 4
The heat transfer coefficient is increased by increasing the contact area of No. 3.

FIG. 3 is a view showing a second embodiment of the present invention, and is a sectional view of a water pipe. A hot water supply pipe 42 and a hot water supply pipe 43 are arranged in two stages, and a common fin 44 is provided. In the figure, the left side corresponds to the entrance side of hot water from the bath, and the right side corresponds to the exit side of hot water from the bath.
As shown in the figure, the height of the fins is set so as to decrease toward the right side, that is, toward the exit side of the bath water pipe. That is, the amount of heat transfer from the burner is large on the left side of the figure and becomes smaller toward the right side.

Since the temperature of the bath water pipe 43 becomes higher as going to the right side of the figure, when only bath water heating is performed, the heat flow from the hot water supply pipe 42 to the bath water pipe 43 as going to the right side. Becomes smaller.
However, in this embodiment, since the amount of heat input to the hot water supply pipe 42 also decreases toward the right side, the right hot water supply pipe 42 can be prevented from being overheated. In the drawing, the hot water supply pipe 42 and the bath water pipe 43 are separated, but they may be tied together to increase the amount of heat transfer. Further, between the fins, the first embodiment is performed. The structure shown in the embodiment may be adopted.

The height of the fins does not necessarily need to be changed sequentially as shown in the figure. For example, a portion corresponding to the last row of the bath water pipe 43 (the rightmost water pipe in the figure). May be lowered, or only a predetermined number of rows from the right may be lowered.

FIG. 4 is a view showing a third example of the embodiment of the present invention, and is a cross-sectional view of a water pipe similarly to FIG.
A hot water supply pipe 42 and a hot water supply pipe 43 are arranged in two stages, and a common fin 44 is provided. In the figure, the left side corresponds to the entrance side of hot water from the bath, and the right side corresponds to the exit side of hot water from the bath.

As shown in FIG.
Are thicker toward the right side, and the corresponding hot water supply pipe 42 is thinner toward the right side in the figure. Therefore, when only the reheating of the bath is performed,
As described in the description of FIG. 3, the rightmost hot water supply pipe 42 is heated most. However, since the pipe diameter is small, the amount of heat transfer to the bath reheating water pipe 43 necessary to prevent overheating is Since the diameter of the small and corresponding bath reheating water pipe 43 is large, the amount of heat that can be received is large. Therefore, overheating of the hot water supply pipe 42 on the right side can be prevented.

It is not always necessary to change the thickness of both the hot water supply pipe 42 and the hot water supply pipe 43, and only one of them may be changed. Further, the thickness of the water pipe does not necessarily need to be sequentially changed as shown in the figure. For example, only the thickness of the portion corresponding to the last row of the bath water pipe 43 (the rightmost water pipe in the figure) is increased. (If necessary, the thickness of the corresponding hot water supply pipe 42 may be reduced), or only a predetermined number of rows from the right may be increased in thickness.

FIGS. 5A and 5B show an example of the fourth embodiment of the present invention, wherein FIG. 5A is a view of a water pipe section viewed from above, and FIG. 5B is a longitudinal sectional view. In this embodiment, the hot water supply pipe 4
2 and the entrance and exit of the bath water pipe are reversed left and right in the figure. That is, in the conventional hot water supply apparatus, as shown in FIG. 1, for example, if the entrance of the hot water supply pipe 42 is on the left side and the exit is on the right side, the entrance of the bath water pipe 43 is also on the left side and the exit is on the right side. However, in the present embodiment, for example, if the entrance of the hot water supply pipe 42 is on the right side and the exit is on the left side, the entrance of the bath reheating water pipe 43 is provided on the left side, and the exit is provided on the right side.

Therefore, the hot water supply pipe 4 corresponding to the hot water supply pipe 43 having the highest temperature at the time of hot water supply.
Since the initial temperature of 3 is low, it is difficult for the hot water supply pipe 42 to be overheated. In addition, since the temperature gradient becomes large, the amount of heat transfer from the hot water supply pipe 42 to the hot water supply pipe 43 also increases. Therefore, overheating of the hot-water supply pipe 42 can be avoided, and the bath reheating capacity can be increased accordingly. Of course, also in this case, it is effective to use the means shown in the first to third embodiments together.

FIGS. 6A and 6B show an example of the fifth embodiment of the present invention, wherein FIG. 6A is a view of a water pipe section viewed from above, and FIG. 6B is a longitudinal sectional view. In this embodiment, in the last row of the bath reheating water pipe 43, the bath reheating water pipe 43 is on the lower side near the burner, and the hot water supply pipe 42 is on the upper side far from the burner. It is upside down. Therefore, since the position of the hot water supply pipe 43 is far from the heat source in the portion where the temperature of the bath reheating water pipe 43 is the highest, overheating of this part can be prevented. As described above, the lower side of the bath reheating water pipe 43 can be selected from a predetermined number of rows including the last row.
Since the hot water supply pipe 42 requires a larger amount of heat, it is not preferable to adopt such a configuration in a majority row.

FIGS. 7A and 7B show an example of the sixth embodiment of the present invention. FIG. 7A is a view of a water pipe section viewed from above, and FIG. 7B is a longitudinal sectional view. 7, the outline of the burner 6 omitted in FIGS. 1, 5, and 6 is also shown. In the conventional gas hot water supply apparatus, the direction of the hot water supply pipe 42 and the hot water supply pipe 43 (vertical direction in the figure) is perpendicular to the length direction of the burner 6. However, in the present embodiment, the directions of the hot water supply pipe 42 and the hot water supply pipe 43 and the length direction of the burner 6 are parallel.

During the bath post-burning combustion, one to three burners on the last row side (right side in the figure) of the bath post-heating water pipe 43 are intermittently burned from the last row side. As described above, the overheating is most likely to occur at the time of bath reheating, but the hot water supply pipe 42 corresponding to the last row of the bath reheating water pipe 43. In this part, the intermittent combustion of the burner 6 is performed, so that the overheating is performed. Can be prevented from occurring. Instead of intermittently burning these burners, the supply gas amount may be reduced only during the bath-burning combustion.

[0054]

As described above, in any one of the claimed inventions, the last row of the hot water supply pipes (exit side) is likely to overheat the hot water supply pipes during the hot water supply operation. ), The amount of heat output from the hot water supply pipe is increased, the amount of heat input is reduced, or the temperature of water is low. Therefore, overheating in this part can be prevented, and the reheating capacity of the bath can be increased accordingly.

[Brief description of the drawings]

FIG. 1 is a diagram showing a first embodiment of the present invention.

FIG. 2 is a diagram showing an example of a method of tying a hot water supply pipe and a hot water supply pipe.

FIG. 3 is a diagram showing a second embodiment of the present invention.

FIG. 4 is a diagram showing a third embodiment of the present invention.

FIG. 5 is a diagram showing a fourth embodiment of the present invention.

FIG. 6 is a diagram showing a fifth embodiment of the present invention.

FIG. 7 is a diagram showing a sixth embodiment of the present invention.

FIG. 8 is a diagram showing the structure of a conventional hot water supply device and a hot water supply device as an example of an embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Hot water pipe, 2 ... Shower, 3 ... Heat exchanger, 4 ... Hot water supply pipe, 5 ... Water amount sensor, 6 ... Gas burner, 7 ... Flow control valve, 8 ... Fixed bypass, 9 ... Bypass control valve, 10 ...
Inlet thermistor, 11: heat exchange thermistor, 12: hot water thermistor, 13: electrical board, 14: switching solenoid valve,
Reference numeral 15: bathtub, 16: pouring solenoid valve, 17 check valve, 18: circulation pipe for reheating, 19: water flow switch, 20: circulation pump, 21: bath thermistor, 22: combustion fan, 2
3 ... Main solenoid valve, 24 ... Proportional valve, 25 ... CO sensor, 2
6 remote control device, 27 check valve, 28 pouring confirmation switch, 29 faucet-shower switching lever, 30 nozzle holder, 31 blow valve, 41 hot water supply device, 42
… Hot water supply pipe, 43… bath additional water pipe, 44… fin,
45 ... brazing material

Claims (9)

[Claims] 1. A hot water supply apparatus for performing hot water supply and bath reheating with a single heat exchanger, wherein at least a last row of water tubes and a hot water supply pipe of a bath reheating water pipe are joined together in the heat exchanger. A hot water supply apparatus characterized in that a gap formed when the water pipes are tied together is filled with a substance having a high heat transfer coefficient. 2. A hot water supply apparatus for performing hot water supply and bath reheating with a single heat exchanger, in which a single bath reheating water pipe and two hot water supply pipes are joined in the heat exchanger. A hot water supply device comprising: 3. A hot water supply apparatus for performing hot water supply and bath reheating with a single heat exchanger, wherein the heat exchanger reverses the flow of hot water in the last row of the bath reheating water pipes and the hot water supply pipe. A hot water supply apparatus characterized in that it has a structure in which at least a water pipe in a last row of a reheating water pipe of a bath and a water pipe in a first row of a hot water supply pipe are joined. 4. The hot water supply apparatus according to claim 2, wherein a gap formed when the water pipes are tied is filled with a substance having a high heat transfer coefficient. 5. A hot water supply apparatus for performing hot water supply and bath reheating with a single heat exchanger, wherein a bath reheating water pipe and a hot water supply pipe are arranged in two stages in the heat exchanger and connected by fins. A hot water supply apparatus, wherein the height of the fins on the water pipe side in the last row of the reheating water pipe of the bath is smaller than the height of the fins on the first row side. 6. A hot water supply apparatus for performing hot water supply and bath reheating with a single heat exchanger, wherein a bath reheating water pipe and a hot water supply pipe are arranged in two stages in the heat exchanger and connected by fins. A hot water supply apparatus characterized in that the diameter of the reheating water pipe of the bath in the heat exchanger is increased as going to the last row. 7. A hot water supply apparatus for performing hot water supply and bath reheating with a single heat exchanger, wherein a bath reheating water pipe and a hot water supply water pipe are arranged in two stages in the heat exchanger and connected by fins. The diameter of the hot water pipe in the heat exchanger
A hot water supply device characterized in that it is tapered as it goes to the last row of the reheating water pipe of the bath. 8. A hot water supply apparatus for performing hot water supply and bath reheating with a single heat exchanger, wherein a bath reheating water pipe and a hot water supply pipe are arranged in two stages in the heat exchanger.
A hot water supply apparatus, wherein at least a water pipe in a last row of a reheating water pipe of a bath in the heat exchanger is arranged on a side close to a heat source. 9. A gas type hot water supply apparatus for performing hot water supply and bath reheating with a single heat exchanger, wherein a bath reheating water pipe and a hot water supply pipe are arranged in two stages in the heat exchanger. A hot water supply apparatus, wherein a water pipe and a burner are arranged in parallel, and have a function of reducing the amount of combustion of a predetermined number of burners on the last row side of the hot water pipe of the bath during reheating combustion of the bath.