JP3368843B2 - 1 can 2 circuit heat source device - Google Patents

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-circuit heat source device used for hot water supply and heating, or hot water supply and bath.

[0002]

2. Description of the Related Art Heretofore, a one-can, two-circuit type heat source device of this type has generally been disclosed in JP-A-63-38852. As shown in FIG. 9 and FIG. 10, this device branches a gas conduit 4 into a dual-purpose combustor 1 and combustors 2 and 3, and separates the gas shut-off valves 5 and 6 and the inlet of the gas conduit 4, respectively. Is equipped with a gas proportional valve 7. The box-shaped can body 8 is provided on the downstream side of the combined combustion section 1 and the combustion sections 2 and 3. The first heat transfer tube 9 and the second heat transfer tube 10 penetrate the can body 8 and are joined to the downstream sides of the dual-purpose combustion section 1 and the combustion sections 2 and 3, and are provided in two stages. The heat receiving fins 11 penetrate the first heat transfer tube 9 and the second heat transfer tube 10. Combustion fan 1
2 communicates with the dual-use combustion section 1 and the combustion sections 2 and 3.

Next, the first isolated operation will be described. When water is passed through the first heat transfer tube 9, the combustion fan 12 is driven, the gas proportional valve 7 is opened at the same time, and the dual-purpose combustion unit 1 starts combustion. Then, the combustion heat is transferred from the heat receiving fins 11 to the first heat transfer tube 9, and the first hot water is discharged from the first heat transfer tube 9. At that time, the gas proportional valve 7 adjusts the combustion amount so as to reach the required first hot water temperature. Also, a large ability (first
(Capacity) is required, the gas cutoff valves 5 and 6 are opened, the combustion sections 2 and 3 start combustion, and the gas proportional valve 7 adjusts the combustion amount (about 36 to 60 ° C.). Next, considering the heat balance of the residual water in the second heat transfer tube 10, the second heat transfer tube 10 itself and the second heat transfer tube 10
The heat receiving fins 11 on the heat transfer tube 10 side are directly heated by the flame and exhaust gas formed in the dual-purpose combustion section 1 and the combustion sections 2, 3. On the other hand, heat is radiated by heat conduction from the residual water in the second heat transfer tube 10 to the first hot water flowing in the first heat transfer tube 9 via the joint between the first heat transfer tube 9 and the second heat transfer tube 10. In particular, most of the combustion heat generated from the dual-purpose combustion section 1 and the combustion sections 2 and 3 is taken from the heat receiving fins 11 to the first heat transfer tube 9, so that the second heat transfer tube 10 receives a relatively small amount of heat, and The heat balance is balanced without the residual water in the heat transfer tube 10 boiling.

Next, the first and second simultaneous operations will be described. When water is passed through the first heat transfer tube 9 and the second hot water is sucked by the second heat transfer tube 10 by a pump (not shown), the dual-use combustion section 1 and the combustion sections 2, 3 are operated as in the first independent operation.
Starts combustion (first priority control).

Then, the heat of combustion is transferred from the heat receiving fins 11 to the first
Since it is transmitted to the heat transfer tube 9, the first hot water of the required temperature is discharged from the first heat transfer tube 9. In addition, since the remaining combustion heat is transferred from the heat receiving fins 11 to the second heat transfer pipes 10, the second hot water whose temperature has risen circulates from the second heat transfer pipes 10 to the heat terminals (about 60 to 80 ° C.) although it is a natural process. ).

[0006]

DISCLOSURE OF THE INVENTION Problem to be Solved by the Invention
In the circuit heat source device, when the second islanding operation is requested,
The gas proportional valve 7 opens and the combined-use combustion unit 1 starts combustion. At that time, the gas proportional valve 7 adjusts the combustion amount so as to reach the required second hot water temperature. Generally, the required capacity (second capacity) for bathing or heating is smaller than the required capacity (first capacity) for hot water supply, so that it is not necessary to additionally operate the combustion units 2, 3. Next, the combustion heat is transferred from the heat receiving fins 11 to the second heat transfer tubes 10.
The second hot water whose temperature has risen is transmitted to the second heat transfer pipe 10.
To the heat terminal. Next, considering the heat balance of the residual water in the first heat transfer tube 9, the first heat transfer tube 9 itself and the heat receiving fins 11 on the first heat transfer tube 9 side directly heat the flame or exhaust gas formed in the dual-purpose combustion section 1. To be done. On the other hand, from the residual water of the first heat transfer tube 9 to the second heat transfer tube 9 through the joint between the second heat transfer tube 10 and the first heat transfer tube 9,
There is heat dissipation due to heat conduction to the second hot water flowing in the heat transfer tube 10. In particular, since a relatively large amount of combustion heat generated from the dual-purpose combustion section 1 is transferred from the heat receiving fins 11 to the first heat transfer tube 9, the temperature of the residual water in the first heat transfer tube 9 rises until the heat balance is balanced, and finally boiling occurs. Had the problem of doing. Although the first heat transfer tube 9A in the downstream stage is not directly heated by the flame or exhaust gas formed in the dual-purpose combustion section 1, it flows from the residual water in the first heat transfer tube 9A through the second heat transfer tube 10A. Since the amount of heat released by the heat conduction to the second warm water whose temperature has risen is also small, there is a problem that the residual water in the first heat transfer tube 9A also becomes high in temperature.

Further, since the dual-purpose combustion section 1 is always burning during operation, the dual-purpose combustion section 1 itself and the second heat transfer tube 10, the first heat transfer tube 9 and the heat receiving fin located downstream of the dual-purpose combustion section 1 No. 11 had a problem that it was thermally deteriorated intensively and was corroded by the condensation of exhaust gas. Further, there is a problem that the side surface of the can body 8 close to the dual-purpose combustion section 1 is constantly heated by the dual-purpose combustion section 1 and cracks due to thermal expansion.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve these problems described above and to provide a one-can two-circuit heat source device which does not boil even during the second independent operation and has a high first thermal efficiency.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention penetrates a can body and joins the first upstream side.
A heat transfer tube, a second heat transfer tube on the downstream side, the first heat transfer tube and the
A heat receiving fin fixed through the second heat transfer tube;
The first heat transfer tube and the second heat transfer tube so that they are sandwiched between
The first transfer is fixed by penetrating and compared with the heat receiving fin.
Combined heat-receiving fins with a small heat-receiving area on the heat pipe side,
A combustion unit that heats the heat receiving fins and the heat receiving fins that also serve as the heat receiving fins.
Combustion unit that heats the engine, and the combustion unit and the combustion unit
And a combustion fan in communication with the first heat transfer tube,
Have residual water and circulate hot water in the second heat transfer tube
At times, only the dual-purpose combustion unit is burned .

[0010] Then, if it is requested a second alone operation,
Combustion heat generated from the dual-purpose combustion section is transferred to the second heat transfer tube via the dual-purpose heat receiving fin, and the temperature of the second hot water rises and circulates from the second heat transfer tube to the heat terminal. Next, considering the heat balance of the residual water in the first heat transfer tube, the heat transfer fins that also serve as the first heat transfer tube are directly heated by the flame or exhaust gas formed in the dual-purpose combustion section. However, since the heat receiving area of the combined heat receiving fin on the side of the first heat transfer tube is formed small, the combustion heat generated from the combined combustion section is not so much transferred to the first heat transfer tube. Further, heat is dissipated from the residual water in the first heat transfer tube to the second hot water through the joint between the first heat transfer tube and the second heat transfer tube.

Further, since the combustion fan communicates with the combustion section and the combined combustion section, air is ejected from the combustion section, and the first
Cool the heat transfer tubes and heat receiving fins. That is, the residual water in the first heat transfer tube that is heated directly to the dual-purpose combustion section is cooled by the first water.
Heat is radiated from both sides via the heat transfer tubes and heat receiving fins. As a result of the above heat balance, the residual water in the first heat transfer tube does not boil. On the other hand, since the side surface of the can body is not directly heated by the flame or exhaust gas formed in the dual-use combustion section, cracking of the can body due to thermal expansion is suppressed.

Next, when the first isolated operation is requested,
Both the firing section and the dual-use combustion section start combustion, and the combustion heat is received
It is transmitted to the first heat transfer tube through the fins that also serve as heat receiving fins,
The first hot water is discharged from the first heat transfer tube. In that case, combined heat reception
Since the heat receiving area of the fin on the side of the first heat transfer tube is made small
The amount of heat received by the first heat transfer tube via the dual heat receiving fins is small
However, since the heat receiving fins receive enough heat,
It can be compensated by the amount of heat received by the first heat transfer tube, and the first independent operation
The thermal efficiency of is improved.

[0013]

DETAILED DESCRIPTION OF THE INVENTION The present invention has can be implemented in the form described in each claim, the can body as claimed in claim 1, wherein
The first heat transfer tube on the upstream side that penetrates and is joined to the first heat transfer tube on the downstream side
Penetrating the second heat transfer tube, the first heat transfer tube and the second heat transfer tube
Between the fixed heat receiving fin and the heat receiving fin
Is fixed to the first heat transfer pipe and the second heat transfer pipe by
Heat receiving area on the side of the first heat transfer tube as compared with the heat receiving fins
The heat-receiving fins that have a small
Combustion part for heating and also for heating the dual-purpose heat receiving fin
Combustion that communicates with the combustion section and the combustion section and the dual-purpose combustion section
A fan and residual water in the first heat transfer tube,
When the hot water is circulated in the second heat transfer tube, the dual-purpose combustion
It is configured to burn only part . And the second
When prompted islanding operation, combustion heat generated from the combined combustion unit is transmitted to the second heat transfer tube through a combined heat fins, the second hot water is circulated from the temperature rise and second heat transfer tubes to the thermal terminal.
Next, considering the heat balance of the residual water in the first heat transfer tube, the heat transfer fins that also serve as the first heat transfer tube are directly heated by the flame or exhaust gas formed in the dual-purpose combustion section. However, since the heat receiving area of the combined heat receiving fin on the side of the first heat transfer tube is formed small, the combustion heat generated from the combined combustion section is not so much transferred to the first heat transfer tube. Further, there is heat dissipation from the residual water of the first heat transfer tube to the second hot water flowing in the second heat transfer tube via the joint portion between the first heat transfer tube and the second heat transfer tube. In addition, the combustion fan
Since it communicates with the combustion section and the dual-use combustion section, it does not burn.
Air blows out from the first combustion section and the first heat transfer tube and heat receiving fins.
To cool. That is, the dual combustion section is directly heated.
Residual water in the heat transfer tube
Radiates heat from both sides via

As a result of the above heat balance, the residual water in the first heat transfer tube is at a relatively low temperature and the heat balance is balanced. In other words, the residual water in the first heat transfer tube is maintained at a temperature slightly higher than the second hot water, so that the residual water in the first heat transfer tube does not boil. On the other hand, since the side surface of the can body is not directly heated by the flame or exhaust gas formed in the dual-use combustion section, cracking of the can body due to thermal expansion is suppressed.

Next, when the first isolated operation is requested,
The firing section and the dual-use combustion section start combustion, and the combustion heat is transferred to the heat receiving fins.
Is transmitted to the first heat transfer tube via the heat receiving fins that also serve as
Water comes out from the first heat transfer tube. In that case, dual-purpose heat receiving fin
The heat receiving area on the first heat transfer tube side of
Although the amount of heat received by the first heat transfer tube via the heat fins is small,
Since the heat receiving area of the fin is sufficient,
Since the amount of heat received by the first heat transfer tube is compensated for,
Efficiency is improved.

Further, the present invention has a dual-purpose heat receiving fin provided on the downstream side of a portion of the combusting portion adjacent to the dual-purpose burning portion. When the second capacity is required and, in particular, the flame or exhaust gas formed in the dual-purpose combustion section is unevenly distributed, the dual-purpose combination of the flame and the exhaust gas provided downstream of the dual-purpose combustion section of the combustion section is provided. Heat the heat-receiving fins.

Therefore, even if the flame or exhaust gas formed in the dual-purpose combustion section is biased for some reason, the previous flame or exhaust gas does not heat the heat-receiving fins, so the residual water in the first heat transfer tube does not boil. Absent.

Further, the present invention has a first heat transfer tube and a second heat transfer tube which are provided in multiple stages as described in claim 3, and a dual purpose heat receiving fin which is formed with a small heat receiving area near the first heat transfer tube in the downstream stage. . Then, when the second capacity is required, the combustion heat generated from the dual-purpose combustion section is transferred to the second heat transfer tube via the dual-purpose heat receiving fin, and the temperature of the second hot water rises and circulates from the second heat transfer tube to the heat terminal. Next, considering the heat balance of residual water in the downstream first heat transfer tube, the downstream first heat transfer tube and combined heat receiving fins are heated by the flame and exhaust gas formed in the combined combustion section. In particular, since the dual-purpose heat receiving fin is formed to have a small heat receiving area in the vicinity of the downstream first heat transfer tube, the combustion heat generated from the dual combustion section is not transferred to the downstream first heat transfer tube so much.
As a result, the residual water temperature of the downstream first heat transfer tube can be suppressed.

Further, as described in claim 4, when the first isolated operation is requested, the operation of the combustion section is prioritized, or when the second isolated operation is requested, the dual operation control is operated. Parts. Then, when the first islanding operation is requested, the islanding operation control unit preferentially starts the operation of the combustion unit and adjusts the combustion amount so that the requested first temperature is reached. Therefore, since the heat receiving area of the heat receiving fin on the side of the first heat transfer tube is formed larger than that of the combined heat receiving fin, the combustion heat generated from the combustion section is efficiently generated by the first heat transfer tube.
The heat transfer tube can be heated, and the first heat efficiency is improved. Then the second
Consider the heat balance of residual water in a heat transfer tube. The second heat transfer tube itself and the heat receiving fins on the downstream side of the combustion section are heated by the flame and exhaust gas formed in the combustion section. However, the first through the heat receiving fin
Since the heat transfer tubes receive most of the combustion heat, the amount of heat received by the second heat transfer tubes is small, and the heat balance can be balanced at a low temperature of the residual water in the second heat transfer tubes. In other words, the residual water in the second heat transfer tube does not boil.

Next, consider the heat balance of the residual water in the first heat transfer tube when the second islanding operation is required. The first heat transfer tube itself on the downstream side of the dual-purpose combustion section and the dual-purpose heat receiving fins are heated by the flame and exhaust gas formed in the dual-purpose combustion section. But,
Since the heat receiving area of the combined heat receiving fin on the side of the first heat transfer tube is formed small, heat conduction through the combined heat receiving fin is small, and the amount of heat received by the first heat transfer tube is small. As a result, the residual water in the second heat transfer tube does not boil.

Further, when simultaneous heating of the first heat transfer tube and the second heat transfer tube is requested as described in claim 5, when the first required capacity is small and the second required capacity is large, it is also used. It has a simultaneous operation control unit that preferentially starts the operation of the combustion unit. Then, the combustor burns so as to reach the required first temperature, and the amount of combustion is adjusted. At that time, when the second capacity is smaller than the required value (second hot water temperature), the simultaneous operation control unit stops the operation of the combustion unit and preferentially starts the operation of the dual-use combustion unit. Since the heat receiving area of the combined heat receiving fin on the side of the first heat transfer tube is formed small, the amount of heat received by the first heat transfer tube is suppressed, and the amount of combustion increases to maintain the first temperature at the target value. Furthermore, the combustion heat generated from the dual-purpose combustion section is efficiently transmitted to the second heat transfer tube, and the temperature of the second hot water further rises. As a result, the second capacity is improved, the second warm water temperature rises, and approaches the target value.

Further, when simultaneous heating of the first heat transfer tube and the second heat transfer tube is requested as described in claim 6, when the first required capacity is large and the second required capacity is small, the combustion is performed. The present invention has a simultaneous operation control unit that preferentially starts the operation of the parts. Then, the dual-purpose combustion section burns to reach the required first hot water temperature, and the combustion amount is adjusted. At that time, when the second capacity is larger than the required value (second hot water temperature), the simultaneous operation control unit stops the operation of the dual-use combustion unit and preferentially starts the operation of the combustion unit. Therefore, since the heat receiving area of the heat receiving fin on the side of the first heat transfer tube is formed larger than that of the dual purpose heat receiving fin, the amount of heat received by the first heat transfer tube increases and combustion is performed in order to maintain the first temperature at the target value. The amount decreases. vice versa,
The amount of heat received by the second heat transfer tube is suppressed (first priority control). As a result, the temperature of the second hot water is suppressed and approaches the target value.

[0023]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a front view of a one-can, two-circuit heat source device according to a first embodiment of the present invention. 2 and 3 are configuration diagrams of the same apparatus as viewed from the side. In the figure, 13 is a dual-purpose combustion section, and combustion sections 14 and 15 are provided on both sides of the dual-purpose combustion section 13.

Further, 16 and 17 are branched gas conduits 18
Is a gas cutoff valve provided in the. Reference numeral 19 is a gas proportional valve provided on the inlet side of the gas conduit 18. Reference numeral 20 denotes a box-shaped can body provided downstream from the outer periphery of the combined combustion section 13 and the combustion sections 14 and 15. Reference numeral 21 is a first heat transfer tube. 22 is a second heat transfer tube. The first heat transfer tubes 21 are arranged on the upstream side of the second heat transfer tubes 22, and the first heat transfer tubes 21 are brazed to each other and penetrate the can body 20 in an integrally joined structure. The first heat transfer tube 21 and the second heat transfer tube 22 that are integrally configured are provided in two staggered steps through the U bend 23 across the downstream side of the combined combustion section 13 and the combustion sections 14 and 15. . Reference numeral 24 denotes a heat receiving fin, which is fixed (brazed) through the first heat transfer pipe 21 and the second heat transfer pipe 22 located on both downstream sides of the combustion sections 14 and 15. Reference numeral 25 denotes a dual-purpose heat receiving fin which is formed with a small heat receiving area on the side of the first heat transfer tube 21 in the lower stage, and which is located on the downstream side of the first heat transfer tube 21.
2 and the first heat transfer tube 21 are fixed by passing through (brazing).
Specifically, the combined heat receiving fins 25 are the first heat transfer tubes 2 in the lower stage.
The fin length extending from 1 to the combined combustion section 13 is formed to be short. The combustion fan 26 is also used as the combustion unit 13 and the combustion unit 1.
It communicates with 4 and 15.

Next, the second isolated operation will be described. When the second hot water is sucked into the second heat transfer pipe 22 by the pump (not shown), the combustion fan 26 is driven, and at the same time, the gas proportional valve 19 is opened and the combined combustion unit 13 is burned by the spark plug (not shown). To start. After that, the gas proportional valve 19 adjusts the combustion amount to a constant amount (the temperature of the second hot water gradually changes). When the second islanding operation is heating, the gas proportional valve 19 adjusts the combustion amount so that the second hot water reaches the required temperature.
Then, the combustion heat generated from the dual-purpose combustion section 13 is efficiently transmitted to the second heat transfer tube 22 via the dual-purpose heat receiving fins 25,
The temperature of the second hot water rises and circulates from the second heat transfer pipe 22 to the heat terminal.

Next, consider the heat balance of the residual water in the first heat transfer tube 21. First, the first heat transfer tube 21 itself located on the downstream side of the dual-purpose combustion unit 13 and the dual-purpose heat receiving fin 25 are combined with the dual-purpose combustion unit 1.
It is directly heated by the flame and exhaust gas formed in 3. However, since the heat receiving area on the side of the first heat transfer tube 21 on the lower stage of the dual purpose heat receiving fin 25 is formed to be small, heat conduction through the dual purpose heat receiving fin 25 is small, and the amount of heat received by the first heat transfer tube 21 is small. Secondly, heat from the residual water in the first heat transfer tube 21 to the second hot water flowing in the second heat transfer tube 22 via the joint (the brazing material) between the first heat transfer tube 21 and the second heat transfer tube 22. There is heat dissipation due to conduction. Thirdly, the first heat transfer tube 21 itself and the heat receiving fins 24 on the downstream side of the combustion units 14 and 15 are blown from the combustion fan 26 and cooled by the air ejected from the combustion units 14 and 15.

As a result, the first heat transfer tube 21 located on the downstream side of the combined combustion section 13 is also indirectly cooled, but strongly cooled by the combustion sections 14 and 15 on both sides. Therefore, the third heat radiation is improved and the first heat reception is suppressed, so that the heat balance can be balanced at a temperature at which the residual water in the first heat transfer tube 21 is low. In other words, since the residual water in the first heat transfer tube 21 is maintained at a temperature slightly higher than that of the second hot water, the first heat transfer tube 2
The residual water of 1 does not boil. However, the first heat transfer tube 21A in the downstream stage is not directly heated by the flame or exhaust gas formed in the dual-purpose combustion section 13, but the first heat transfer tube 21A
Since the amount of heat radiation from the residual water to the second warm water whose temperature has risen flowing in the second heat transfer tube 22A is also small, the residual water in the first heat transfer tube 21A is at a high temperature.

On the other hand, the side surface of the can body 20 is not directly heated by the flame or exhaust gas formed in the dual-purpose combustion section 13, and the combustion section 1
Since the cans 20 are cooled by the air jetted from Nos. 4 and 15, cracks due to thermal expansion of the can 20 are suppressed. The front and rear surfaces of the can body 20 are heated by both ends of the dual-purpose combustion section 13, but there is no problem because the heating area is small.

Next, the first isolated operation will be described. When water is passed through the first heat transfer tube 21 by opening a currant,
The combustion fan 26 is driven, the gas proportional valve 19 is opened at the same time, and the dual-purpose combustion unit 13 starts combustion. Then, the combustion heat is transferred from the combined heat receiving fins 25 to the first heat transfer tube 21, and the first hot water is discharged from the first heat transfer tube 21. At that time, the gas proportional valve 19 adjusts the combustion amount so as to reach the required first temperature. When a large first capacity is required, the gas cutoff valves 16 and 17 are opened to start combustion in the combustion units 14 and 15, and the gas proportional valve 19 adjusts the combustion amount (about 38).
~ 60 ° C). And, the combined heat receiving fins 25 are the first lower
Since the heat receiving area on the heat transfer tube 21 side is formed small, the heat receiving amount of the first heat transfer tube 21 via the combined heat receiving fins 25 is small, but the heat receiving amount of the first heat transfer tube 21 via the heat receiving fins 24 is correspondingly small. Since it compensates, the thermal efficiency of the first isolated operation is improved.
Next, considering the heat balance of the second heat transfer tube 22, the first heat transfer tube 21 cannot sufficiently receive the heat with the combined heat receiving fins 25, and conversely, the amount of heat received by the second heat transfer tube 22 increases. Therefore,
The residual water in the second heat transfer tube 22 does not boil but inevitably has a relatively high temperature.

(Embodiment 2) FIG. 4 is a front view of a one-can, two-circuit type heat source device according to a second embodiment of the present invention. The difference from the first embodiment is that a dual-purpose heat receiving fin 30 is added on the downstream side of the portions of the combustion units 27 and 28 that are close to the dual-purpose combustion unit 29. Specifically, the dual-purpose heat receiving fins 25 and 30 are provided up to the width B of the dual-purpose combustion part 29. The same reference numerals as those of the first embodiment have the same structure, and the description thereof will be omitted.

Next, when the second isolated operation is required, and particularly when the flame or exhaust gas formed in the dual-purpose combustion section 29 is biased due to soot or disorder of the dual-purpose heat receiving fins 25,
The combined heat receiving fins 25 and the additional combined heat receiving fins 30 are heated by the flame and exhaust gas. Therefore, even if the flame or exhaust gas formed in the dual-purpose combustion section 28 is biased for some reason, the previous flame or exhaust gas does not come out of the width B, and the heat receiving fins 24 are not directly heated. 1
The residual water in the heat transfer tube does not boil.

(Third Embodiment) FIG. 5 is a side view of a one-can, two-circuit type heat source device according to a third embodiment of the present invention. The difference from the first embodiment is that the cutout 32 is provided around the downstream first heat transfer tube 31A, and the cut 33 is formed up to the vicinity of the first heat transfer tube 31A to reduce the heat receiving area of the dual-purpose heat receiving fin 34. It is provided. The same reference numerals as those of the first embodiment have the same structure, and the description thereof will be omitted.

Next, when the second islanding operation is requested, the combustion heat generated from the dual-purpose combustion section 13 is transmitted to the second heat transfer pipe 22 via the dual-purpose heat receiving fins 34, and the temperature of the second hot water rises and the second transfer occurs. It circulates from the heat pipe 22 to the heat terminal. Next, considering the heat balance for the residual water in the first heat transfer tube 31A in the downstream stage,
The downstream first heat transfer tube 31A and the combined heat receiving fins 34 are heated by the flame and exhaust gas formed in the combined combustion section 13. In particular, the first heat transfer tube 3 in the downstream stage of the combined heat receiving fin 34
Since the notch 32 is provided and the notch 33 is formed so as to reduce the heat receiving area in the vicinity of 1 A, the dual-purpose combustion unit 1
Combustion heat generated from No. 3 is too much and the first heat transfer tube 31 at the downstream stage
It does not reach A. As a result, the downstream first heat transfer tube 13A
The temperature of the residual water is suppressed. However, the amount of heat received by the first heat transfer tube 31 via the combined heat receiving fins 34 is very small, but the amount of heat received by the first heat transfer tube 21 via the heat receiving fins 24 is compensated for that amount, so the thermal efficiency of the first independent operation is increased. Can be maintained almost. Even if a cutout is provided in the second heat transfer tube 22 of the combined heat receiving fin 34 and the first heat transfer tube 31A in the downstream stage, there is no great difference in the effect of preventing boiling.

(Embodiment 4) FIG. 6 is a front view of a one-can, two-circuit heat source device according to a fourth embodiment of the present invention. The difference from Example 1 is that
By providing the isolated operation control unit 38 that prioritizes the operation of the combustion units 35 and 36 when the first isolated operation is requested, or operates the combined combustion unit 37 when the second isolated operation is requested. is there. Further, flowing water detectors 41 and 42 are provided at the inlets of the first heat transfer pipe 39 and the second heat transfer pipe 40, respectively, and the gas cutoff valves 44 to 42 are provided in the gas conduit 43 so as to correspond to the combustion units 35 and 36 and the combined use combustion unit 37. 46 is provided.
The same reference numerals as those of the first embodiment have the same structure, and the description thereof will be omitted.

Next, the first isolated operation will be described. When the currant or the like is opened and water is passed through the first heat transfer pipe 39, and the water flow detector 41 sends an ON signal, the islanding operation control unit 38
First, the gas proportional valve 19 and the gas cutoff valve 46 are simultaneously opened, and the combined combustion section 37 starts combustion. Subsequently, the islanding control unit 38 opens the gas cutoff valve 44 and the combustion unit 35 starts combustion. When a flame detector (not shown) detects a flame, the gas cutoff valve 46 is closed and only the combustion section 35 continues combustion. After that, the gas proportional valve 19 adjusts the combustion amount so that the required first temperature is reached.

When a large first capacity is required, the gas cutoff valve 45 is opened and the combustion section 36 also starts combustion. Therefore, since the combined heat receiving fins 24 having a small heat receiving area on the first heat transfer tube 39 side are not used, the combustion portion 35,
The combustion heat generated from 36 can efficiently heat the first heat transfer tube 39, and the first heat efficiency is improved. However, when the maximum first capacity is required, the gas cutoff valve 46 is opened again and the dual-purpose combustion section 37 starts combustion, so that the dual-purpose heat receiving fin 25 is used, and the first thermal efficiency is slightly reduced.

Next, the second independent operation will be described. When a pump or the like is driven to pass water through the second heat transfer pipe 40 and the water flow detector 42 sends an ON signal, the islanding operation control unit 38
Simultaneously opens the gas proportional valve 19 and the gas cutoff valve 46, and the combined combustion section 37 starts combustion.

At this time, the gas proportional valve 19 controls the combustion amount to be constant. This effect is the same as in Examples 1 to 3.

(Fifth Embodiment) FIG. 7 is a partial cross-sectional side view of a one-can, two-circuit heat source device according to a fifth embodiment of the present invention. The difference from the fourth embodiment is that the first
When the simultaneous heating of the heat transfer tube and the second heat transfer tube is requested, the first
When the required capacity of No. 2 is small and the second required capacity is large, the simultaneous operation control unit 48 that preferentially starts the operation of the combined combustion unit 47 is provided. Also, the first heat transfer tube 4
9 and the outlets of the second heat transfer tube 50, temperature detectors 51,
52 is provided. The same reference numerals as those in the fourth embodiment have the same structure, and the description thereof will be omitted.

Then, the transition from the first independent operation to the simultaneous first and second (mainly heating) operations will be described. For example, when the second hot water is sucked into the second heat transfer pipe 40 by the pump (not shown) while the combustors 35 and 36 are burning, the flowing water detectors 41 and 42 both send ON signals,
The gas proportional valve 19 adjusts the combustion amount so that the first hot water temperature detected by the temperature detector 51 reaches a target value. Then, if the second hot water temperature detected by the temperature detector 52 does not reach the target value, the gas cutoff valve 46 is opened and the dual-purpose combustion unit 37 starts combustion. Immediately after that, the gas cutoff valve 45 is closed to stop the combustion of the combustion section 36. Even then, the temperature detector 5
The gas proportional valve 19 adjusts the combustion amount so that the first hot water temperature detected by 1 reaches a target value. Since the heat receiving area of the combined heat receiving fins 25 on the side of the first heat transfer tube 39 is formed small, the amount of heat received by the first heat transfer tube 39 is suppressed, and the gas proportionality is maintained in order to maintain the first hot water temperature at the target value. The valve 19 increases the combustion amount (first priority control). Further, the first heat transfer tube 3
As the amount of heat received by 9 decreases, the combustion heat generated from the dual-purpose combustion section 37 is efficiently transferred to the second heat transfer tube 40, and the temperature of the second hot water further rises and circulates from the second heat transfer tube 63 to the heat terminal. To do. As a result, the second capacity is improved and the second warm water temperature rises, and the target value can be approached.

(Sixth Embodiment) FIG. 8 is a partial cross-sectional side view of a one-can, two-circuit heat source device according to a sixth embodiment of the present invention. The difference from the fifth embodiment is that the first
When the simultaneous heating of the heat transfer tube and the second heat transfer tube is requested, the first
When the required capacity of No. 2 is large and the second required capacity is small, the simultaneous operation control unit 55 that preferentially starts the operation of the combustion units 53 and 54 is provided. The same reference numerals as those in the fourth embodiment have the same structure, and the description thereof will be omitted.

The transition from the second independent operation to the simultaneous first and second (mainly heating) operation will be described. When the dual-purpose combustion unit 37 is burning, the current detectors 41 and 42 are immediately detected by the temperature detector 51 when the currant or the like is opened and water is passed through the first heat transfer pipe 39, and the water flow detectors 41 and 42 both send ON signals. Gas proportional valve 19 so that the first warm water temperature reaches the target value
Adjusts the amount of combustion. If the second hot water temperature detected by the temperature detector 52 exceeds the target value, the gas shutoff valve 4
4 is opened, and the combustion unit 53 starts combustion. Shortly thereafter,
The gas cutoff valve 46 is closed to stop the combustion of the dual-purpose combustion section 37. Even at that time, the gas proportional valve 19 adjusts the combustion amount so that the first hot water temperature detected by the temperature detector 51 reaches the target value. Then, the first heat transfer pipe 39 is formed by the heat receiving fins 24.
Since the amount of heat received by the gas increases, the gas proportional valve 19 decreases the combustion amount in order to maintain the first hot water temperature at the target value (first
Priority control). Furthermore, the combustion heat generated from the combustion section 53 is efficiently transmitted to the first heat transfer tube 39, and conversely the second heat transfer tube 40.
The second hot water temperature further decreases by the amount of heat received by the second heat transfer pipe 40 and is circulated from the second heat transfer pipe 40 to the heat terminal. As a result, the second capacity is suppressed and the second warm water temperature is lowered, so that the target value can be approached.

[0044]

As described above, according to the present invention, the second single
During operation, only the dual-use combustion section burns and the heat receiving area is small.
Since the heat receiving fins for heating are heated, the residual water in the first heat transfer tube
It can prevent rising and can suppress thermal deterioration of the can. Also, the first
Since there is sufficient heat received by the heat receiving fins when operating alone,
The first heat exchange rate can be improved.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a one-can, two-circuit heat source device according to a first embodiment of the present invention viewed from the front.

FIG. 2 is a cross-sectional view of the dual-use combustion section of the same device seen from the side.

FIG. 3 is a configuration diagram of a cross-section of a combustion unit when the device is viewed from the side.

FIG. 4 is a front view of a one-can, two-circuit heat source device according to a second embodiment of the present invention.

FIG. 5 is a side view of a one-can two-circuit heat source device according to a third embodiment of the present invention.

FIG. 6 is a configuration diagram of a one-can two-circuit heat source device according to a fourth embodiment of the present invention as viewed from the front.

FIG. 7 is a configuration diagram of a one-can, two-circuit heat source device according to a fifth embodiment of the present invention as seen from the front.

FIG. 8 is a configuration diagram of a one-can two-circuit heat source device according to a sixth embodiment of the present invention as seen from the front.

FIG. 9 is a front view of a conventional one-can-two-time type heat source device.

FIG. 10 is a configuration diagram of the same apparatus seen from the side.

[Explanation of symbols]

13, 29, 37 Combined use combustion section 14, 15, 27, 28, 35, 36, 53, 54 Combustion section 20 Can body 21, 31 First heat transfer tube 22, 32 Second heat transfer tube 24 Heat receiving fins 25, 30, 34 Combined heat-receiving fin section 26 Combustion fan 38 Single operation control section 48, 55 Simultaneous operation control section

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Koichi Kanazaki 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Masatomo Yoshimura 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd. Company (72) Inventor Hiroyuki Funabashi 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) Reference JP 10-132388 (JP, A) JP 10-185326 (JP, A) ) JP-A-10-103767 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) F24H 1/00 303 F24H 9/00

Claims (6)

(57) [Claims] 1. An upstream-side first member which penetrates a can body and is joined
1 heat transfer tube and second heat transfer tube on the downstream side, and the first heat transfer tube and front
The heat receiving fins penetratingly fixed to the second heat transfer tube and the heat receiving fins.
The first heat transfer tube and the second heat transfer tube so as to be sandwiched between the two.
Fixed to the first heat receiving fin and compared with the first heat receiving fin.
Combined heat receiving fins with a small heat receiving area on the heat transfer tube side
And a combustion section for heating the heat receiving fins, and the combined heat receiving
Combustion part that also heats fins
A first heat transfer tube having a combustion fan communicating with a combustion section,
Has residual water, and hot water is circulated through the second heat transfer pipe.
1 can configured to burn only the dual-purpose combustion section
Two-circuit heat source device. 2. The one-can, two-circuit heat source device according to claim 1, further comprising a dual-purpose heat receiving fin provided on the downstream side of a portion of the combustion section adjacent to the dual-purpose combustion section. 3. A first heat transfer tube and a second heat transfer tube provided in multiple stages,
The one can 2 according to claim 1 or 2, further comprising: a dual-purpose heat receiving fin having a small heat receiving area near the first heat transfer tube on the downstream side.
Circuit type heat source device. 4. An isolated operation control unit for operating the combined combustion unit when the first isolated operation is requested, or when the second isolated operation is requested. 3. A 1-can 2-circuit type heat source device according to any one of 3 above. 5. When the first heat transfer tube and the second heat transfer tube are requested to be simultaneously heated, when the first required capacity is small and the second required capacity is large, the operation of the dual-purpose combustion section is prioritized. The one-can two-circuit heat source device according to any one of claims 1 to 3, further comprising: a simultaneous operation control unit that is started. 6. When the first heat transfer tube and the second heat transfer tube are requested to be simultaneously heated, when the first required capacity is large and the second required capacity is small, the operation of the combustion section is prioritized. The one-can two-circuit heat source device according to any one of claims 1 to 3, further comprising a simultaneous operation control unit for starting.