JP2001091057A - Single-boiler two-circuit heat source unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure high efficiency at individual operation, while preventing heating tubes from being clogged with scales. SOLUTION: This heat source unit comprises first heating tubes 26 laid on the downstream side of a first combustion section 16, while penetrating a can body 25 disposed on the downstream side of first and second adjacent combustion sections 16, 19, second heating tubes 17 provided on the downstream side of the second combustion section 19, pair heating tubes 28 provided in the vicinity of the boundary of the first and second combustion sections 16, 19 while abutting against the first and second heating tubes 26, 27, and slits 30 formed in heat receiving fins 29 to separate the pair heating tubes 28 from the first and second heating tubes 26, 27. Since radiation loss due to air ejecting from the second combustion section 19 is suppressed, high efficiency can be sustained at the individual operation of the first combustion section 16. Furthermore, the second heating tubes 27 are prevented from being clogged with scales at the part of heat receiving fin 29B, located on the downstream side of the second adjacent combustion sections 19.

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 combined use of hot water supply and heating or hot water supply and bath.

[0002]

2. Description of the Related Art Conventionally, this type of one-can, two-circuit heat source device has been generally described in JP-A-9-243166. As shown in FIG. 8, the apparatus comprises a first combustion unit 1 and a second combustion unit 2 which are branched from a gas conduit 3 and respectively provided with gas shut-off valves 4 and 5 and a gas conduit 3 at the inlet side of the gas conduit 3. A proportional valve 6 was provided. Box-shaped can 7
Was provided downstream of the first combustion unit 1 and the second combustion unit 2. The first heat transfer tubes 8 penetrate the can body 7 and are provided in two stages on the downstream side of the first combustion unit 1. Each first heat transfer tube 8 is bent (not shown) so as to form a single passage in the figure. They were connected like arrows. Similarly, the second heat transfer tube 9 penetrates the can body 7 and is provided in one in the first combustion part 1 and in the vicinity of the second combustion part 2, and further provided in two stages downstream of the second combustion part 2, and is provided in two stages. The two heat transfer tubes 9 were connected so as to form a single passage. In particular, the first combustion unit 1
On the downstream side of the second combustion part 2, the paired heat transfer tubes 10 are configured by contacting the first heat transfer tube 8 </ b> A on the upstream side and the second heat transfer tube 9 </ b> A on the downstream side. A return tube (not shown) was provided. The shared heat receiving fins 11 were fixed through the first heat transfer tube 8 and the second heat transfer tube 9 by welding. At the downstream side of the boundary between the first combustion unit 1 and the second combustion unit 2, a square hole 12 opens to the heat receiving fin 11, and the first heat transfer tube 8
And the second heat transfer tube 9 is not provided. The combustion fan 13 is the first
The combustion unit 1 and the combustion unit 2 were in communication. Ignition means 14, 1
5 were provided downstream of the first combustion unit 1 and the second combustion unit 2, respectively.

Next, the isolated operation of the first combustion section will be described. When water is passed through the first heat transfer tube 8, the combustion fan 1
3 is driven, the gas shutoff valve 4 and the gas proportional valve 6 are opened, and the first
The combustion section 1 starts combustion by the ignition means 14. Then, the heat of combustion is transferred to the heat receiving fins 11A on the downstream side of the first combustion unit 1.
The heat is transmitted from the portion to the first heat transfer tube 8 and the first hot water flows out.
At that time, the gas proportional valve 6 adjusts the combustion amount so as to reach the required first hot water temperature.

Next, the isolated operation of the second combustion section will be described. When the second hot water is sucked from the return pipe into the second heat transfer pipe 9A by a pump (not shown), the gas shutoff valve 5 and the gas proportional valve 6 are opened, and the second combustion part 2 starts combustion by the ignition means 15. I do. At this time, the gas proportional valve 6 adjusts the combustion amount so as to achieve the required second hot water temperature or the second required capacity. Then, since the heat of combustion is transmitted from the heat receiving fins 11B on the downstream side of the second combustion part 2 to the second heat transfer pipe 9, the second hot water whose temperature has risen circulates to a heat terminal (not shown).

Next, the simultaneous operation of the first and second combustion units will be described. When water is passed through the first heat transfer tube 8 and the second hot water is sucked into the second heat transfer tube 9A by the pump,
The first combustion unit 1 and the second combustion unit 2 start burning by the ignition means 14 and 15. At that time, the heat of combustion of the first combustion unit 1 is transmitted from the heat receiving fins 11A to the first heat transfer tube 8 in the same manner as in the independent operation of the first combustion unit, so that the first hot water at the required temperature is discharged (first water). Priority control). On the other hand, since the gas proportional valve 6 is also used, the second combustion part 2 burns with the same combustion load as the first combustion part 1, and as a result, the amount of combustion in the second combustion part 2 becomes higher. Therefore, the heat of combustion of the second combustion part 2 is
The second hot water is transmitted from the portion 1B to the second heat transfer pipe 9, and the temperature of the second hot water is circulated to the heat terminal although the temperature rises gradually.

[0006]

The above-described conventional one can 2
In the circuit-type heat source device, when the first operation of the first combustion unit is required, a part of the heat received by the heat receiving fins 11 </ b> A is partly received by the heat receiving fins 11 </ b> A even though the square hole 12 serving as the heat resistance is opened. Heat was also conducted to the 11B portion. Thereafter, the heat conducted to the heat receiving fins 11B is radiated to the air ejected from the second combustion part 2, so that the first heat is transferred to the first fin 11B.
There was a problem that the efficiency of the single operation of the combustion section was greatly reduced. Further, the heat conducted to the heat receiving fins 11B heats the second heat transfer pipe 9B downstream of the second combustion part 2, so that the residual water in the second heat transfer pipe 9B has a high temperature (about 110 ° C.).
And the clogging of the scale (for example, calcium carbonate) becomes very likely to occur. Further, the heat received by the heat receiving fins 11A also heats the second heat transfer tube 9A, and the first heat transfer tube 8A receives heat even though there is heat radiation from the second heat transfer tube 9A to the first heat transfer tube 8A. Heat transfer tube 8A
There is a problem that the residual water in the inside becomes high temperature (about 100 ° C.) and scale clogging becomes relatively easy to occur.

Further, when the isolated operation of the second combustion section is required, the heat received by the heat receiving fins 11B is also conducted to the heat receiving fins 11A even though the square holes 12 are opened. After that, the heat conducted to the heat receiving fins 11A is also recovered to the second heat transfer tube 9A of the paired heat transfer tubes 10, but most of the heat is radiated to the air ejected from the first combustion unit 1, so that There is a problem that the efficiency of the independent operation of the second combustion unit is reduced by the heat radiation loss. Although the heat conducted to the heat receiving fins 11A also heats the first heat transfer tube 8A, there is heat radiation from the first heat transfer tube 8A to the second heat transfer tube 9A. 8A
The temperature of the residual water in the inside becomes low (about 90 ° C.), and the clogging of the scale can be suppressed.

Accordingly, the present invention has been made to solve the above-mentioned problems, and to provide a one-can, two-circuit heat source device capable of ensuring the efficiency of the first and second combustion sections during independent operation and suppressing scale clogging. Aim.

[0009]

According to the present invention, there is provided a first combustion section and a second combustion section provided adjacently to solve the above-mentioned problems, a can body provided downstream of both combustion sections, and a can body. And a plurality of second heat transfer tubes penetrating the can body and provided downstream of the second combustion unit.
A heat transfer tube, a pair of heat transfer tubes provided in contact with the first heat transfer tube and the second heat transfer tube in the vicinity of a boundary between the first combustion portion and the second combustion portion, and a through heat fixed to the first heat transfer tube and the second heat transfer tube And a slit formed in the heat receiving fin so as to separate the paired heat transfer tube and the first heat transfer tube or the paired heat transfer tube and the second heat transfer tube.

Then, when water is passed through the first heat transfer tube and the first combustion section starts burning, the heat receiving fin portion downstream of the first combustion section receives heat of combustion generated from the first combustion section, Next, the first heat transfer tube and the first heat transfer tube of the paired heat transfer tubes recover heat.

At this time, since the slit is formed so as to separate the paired heat transfer tube and the second heat transfer tube, the heat received by the heat receiving fin portion on the downstream side of the first combustion portion is transferred to the downstream side of the second combustion portion. A little heat conduction to the heat receiving fins. That is, since the heat radiation loss due to the air ejected from the second combustion portion at the heat receiving fin portion on the downstream side of the second combustion portion is suppressed, the efficiency of the single operation of the first combustion portion can be maintained. Further, the second heat transfer tube fixed to the heat receiving fin portion on the downstream side of the second combustion portion is hardly heated, so that clogging of the scale in the second heat transfer tube can be suppressed.

Next, even when water is passed through the second heat transfer tube and the second combustion unit starts combustion, the efficiency of the single operation of the second combustion unit can be maintained as in the case of the single operation of the first combustion unit. . Also,
Scale clogging in the first heat transfer tube fixed to the heat receiving fin portion on the downstream side of the first combustion section can be suppressed.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention can be embodied in the form described in each claim. The invention described in claim 1 is characterized in that a first combustion section and a second combustion section provided adjacent to each other and both combustion sections are provided. A can body provided downstream of the unit, a plurality of first heat transfer tubes provided downstream of the first combustion unit through the can body, and a second heat transfer tube penetrating the can body.
A plurality of second heat transfer tubes provided downstream of the combustion unit, and a pair of heat transfer tubes provided in contact with the first heat transfer tube and the second heat transfer tube near a boundary between the first combustion unit and the second combustion unit. A heat receiving fin penetrating through the first heat transfer tube and the second heat transfer tube, and a slit formed in the heat receiving fin so as to separate the paired heat transfer tube and the first heat transfer tube or the paired heat transfer tube and the second heat transfer tube. Things.

Then, when water is passed through the first heat transfer tube and the first combustion section starts combustion, the heat receiving fin portion downstream of the first combustion section receives heat of combustion generated from the first combustion section, Next, the first heat transfer tube and the first heat transfer tube of the paired heat transfer tubes recover heat.

At this time, since the slit is formed so as to separate the paired heat transfer tube and the second heat transfer tube, the heat received by the heat receiving fin portion on the downstream side of the first combustion portion is transferred to the downstream side of the second combustion portion. A little heat conduction to the heat receiving fins. That is, since the heat radiation loss due to the air ejected from the second combustion portion at the heat receiving fin portion on the downstream side of the second combustion portion is suppressed, the efficiency of the single operation of the first combustion portion can be maintained. Further, the second heat transfer tube fixed to the heat receiving fin portion on the downstream side of the second combustion portion is hardly heated, so that clogging of the scale in the second heat transfer tube can be suppressed.

Next, even when water is passed through the second heat transfer tube and the second combustion unit starts combustion, the efficiency of the single operation of the second combustion unit can be maintained as in the case of the single operation of the first combustion unit. . Also,
Scale clogging in the first heat transfer tube fixed to the heat receiving fin portion on the downstream side of the first combustion section can be suppressed.

The invention according to claim 2 is such that the heat receiving fin is provided with a sub-slit substantially in parallel with the vicinity of the end of the slit.

In the case of the single operation of the first combustion section, the heat receiving fin portion on the downstream side of the first combustion section receives the combustion heat generated from the first combustion section, and then the first heat transfer tube and the paired heat transfer tube. The first heat transfer tube recovers heat.

At this time, a sub-slit formed substantially in parallel near the end of the slit is formed so as to further separate the paired heat transfer tube and the second heat transfer tube, so that the downstream side of the first combustion portion is provided. A part of the heat received by the heat receiving fin portion is slightly conducted to the heat receiving fin portion downstream of the second combustion section. That is, the heat loss due to the air ejected from the second combustion portion at the heat receiving fin portion on the downstream side of the second combustion portion is prevented, and the efficiency of the single operation of the first combustion portion can be secured. Further, since the second heat transfer tube fixed to the heat receiving fin portion on the downstream side of the second combustion portion is not heated, clogging of the scale in the second heat transfer tube can be prevented.

The invention according to claim 3 is characterized in that the first combustion section and the second combustion section provided adjacent to each other, the can body provided downstream of both the combustion sections, and the first combustion section penetrate through the can body. A plurality of first heat transfer tubes provided downstream of the first combustion unit, a plurality of second heat transfer tubes provided through the can body and provided downstream of the second combustion unit,
A pair of heat transfer tubes provided in contact with the first heat transfer tube and the second heat transfer tube near the boundary between the combustion portion and the second combustion portion, a heat receiving fin penetrating and fixed to the first heat transfer tube and the second heat transfer tube, The fin is provided with a large number of openings that are closely attached to the gaps between the paired heat transfer tubes and the first heat transfer tube or between the paired heat transfer tubes and the second heat transfer tube.

In the case of the single operation of the first combustion section, the heat receiving fin portion on the downstream side of the first combustion section receives the heat of combustion generated from the first combustion section, and then the first heat transfer tube and the paired heat transfer tube. The first heat transfer tube recovers heat.

At this time, since the heat receiving fins have a large number of openings which are in close contact with the gaps between the paired heat transfer tubes and the second heat transfer tubes, a part of the heat received by the heat receiving fins on the downstream side of the first combustion portion is reduced. A small amount of heat is conducted to the heat receiving fin portion on the downstream side of the second combustion portion. That is, since the heat radiation loss due to the air ejected from the second combustion portion at the heat receiving fin portion on the downstream side of the second combustion portion is suppressed, the efficiency of the single operation of the first combustion portion can be maintained. Further, the second heat transfer tube fixed to the heat receiving fin portion on the downstream side of the second combustion portion is hardly heated, so that clogging of the scale in the second heat transfer tube can be suppressed.

On the other hand, since the heat receiving fins are intermittently connected in the gap between the paired heat transfer tubes and the first heat transfer tube, the strength of the heat receiving fins themselves is high, and the first heat transfer tubes to the heat receiving fins and the second heat transfer fins are connected to each other.
Insertion, assembly, and expansion of heat transfer tubes can be performed relatively easily.

According to a fourth aspect of the present invention, there is provided a first combustion section and a second combustion section provided adjacent to each other, a can body provided downstream of both combustion sections, and a first body penetrating the can body. A plurality of first heat transfer tubes provided downstream of the combustion unit; a plurality of second heat transfer tubes provided through the can body and provided downstream of the second combustion unit; a first combustion unit and a second combustion unit A pair of heat transfer tubes provided in contact with the first heat transfer tube and the second heat transfer tube in the vicinity of the boundary between the first heat transfer tube and the second heat transfer tube;
The heat receiving fin includes a heat receiving fin penetrated and fixed to the heat transfer tube, and the heat receiving fin includes a thin portion in which a gap between the paired heat transfer tube and the first heat transfer tube or the paired heat transfer tube and the second heat transfer tube is formed to be thin.

In the case of the single operation of the first combustion section, the heat receiving fin portion on the downstream side of the first combustion section receives the heat of combustion generated from the first combustion section, and then the first heat transfer tube and the pair of heat transfer tubes. The first heat transfer tube recovers heat.

At this time, since the thin portion where the thickness of the gap between the pair of heat transfer tubes and the second heat transfer tube is formed has a very large thermal resistance, the heat receiving fin portion on the downstream side of the first combustion portion receives heat. A part of the heat conducts a little heat to the heat receiving fin part downstream of the second combustion part. That is, since the heat radiation loss due to the air ejected from the second combustion portion at the heat receiving fin portion on the downstream side of the second combustion portion is suppressed, the efficiency of the single operation of the first combustion portion can be maintained. Further, the second heat transfer tube fixed to the heat receiving fin portion on the downstream side of the second combustion portion is hardly heated, so that clogging of the scale in the second heat transfer tube can be suppressed.

On the other hand, since the heat receiving fin is not provided with a slit or an opening, the strength of the heat receiving fin is ensured. As a result, the insertion, assembly, and expansion of the first and second heat transfer tubes into the heat receiving fins can be easily performed.

According to a fifth aspect of the present invention, there is provided a first combustion unit and a second combustion unit provided adjacent to each other, a can body provided downstream of both combustion units, and a first combustion unit penetrating the can body. A plurality of first heat transfer tubes provided downstream of the combustion unit; a plurality of second heat transfer tubes provided through the can body and provided downstream of the second combustion unit; a first combustion unit and a second combustion unit Excluding the paired heat transfer tubes, the first heat transfer fins fixed through the first heat transfer tubes except for the paired heat transfer tubes, and the paired heat transfer tubes, It comprises a second heat receiving fin penetratingly fixed to the second heat transfer tube and a pair heat receiving fin penetratingly fixed to the paired heat transfer tube.

In the case of the single operation of the first combustion unit, the first heat receiving fin and the paired heat receiving fin receive the heat of combustion generated from the first combustion unit, and then the first heat transfer fin and the first heat transfer fin of the paired heat transfer tube. Heat transfer tubes recover heat.

At this time, since the paired heat receiving fins and the second heat receiving fins are separated from each other, the heat received by the paired heat receiving fins has no heat conduction to the second heat receiving fins, and the first combustion unit is operated independently. Efficiency can be secured. Naturally, clogging of the scale in the second heat transfer tube of the second heat receiving fin portion can also be prevented.

Next, even when water is passed through the second heat transfer tube and the second combustion unit starts combustion, the efficiency of the second operation of the second combustion unit can be ensured as in the case of the single operation of the first combustion unit. . Also,
Scale clogging of the first heat receiving fin in the first heat transfer tube can be prevented.

In the invention according to claim 6, the thickness of the pair of heat receiving fins is made smaller than that of the first heat receiving fin or the second heat receiving fin.

In the case of the single operation of the first combustion section, the first heat receiving fin and the pair heat receiving fin receive the heat of combustion generated from the first combustion section, and then the first heat transfer fin and the first heat transfer fin of the pair heat transfer pipe. Heat transfer tubes recover heat.

At this time, since the thickness of the paired heat receiving fins is made smaller than that of the first heat receiving fins, the heat received by the paired heat receiving fins is smaller than the heat received by the first heat receiving fins. Since the amount of heat received by the pair of heat receiving fins is small, the heating of the pair of heat transfer tubes to the second heat transfer tube is small,
The clogging of the scale in the heat transfer tube can be prevented.

Next, when water is passed through the second heat transfer tube and the second combustion unit starts combustion, the scale clogging in the first heat transfer tube of the paired heat transfer tube is performed in the same manner as in the single operation of the first combustion unit. Can be prevented.

In the invention according to claim 7, the number of paired heat receiving fins is smaller than that of the first heat receiving fin or the second heat receiving fin.

In the case of the single operation of the first combustion section, the first heat receiving fin and the paired heat receiving fin receive the heat of combustion generated from the first combustion section, and then the first heat transfer fin and the first heat transfer fin of the paired heat transfer pipe. Heat transfer tubes recover heat.

At this time, since the number of paired heat receiving fins is smaller than that of the first heat receiving fins, the heat received by all paired heat receiving fins is smaller than the heat received by all first heat receiving fins. Since the amount of heat received by all of the paired heat receiving fins is small, heating of the paired heat transfer tubes to the second heat transfer tube is small, and it is possible to prevent scale clogging in the second heat transfer tubes of the paired heat transfer tubes.

Next, when water is passed through the second heat transfer tube and the second combustion unit starts combustion, the scale clogging in the first heat transfer tube of the paired heat transfer tube is performed in the same manner as in the independent operation of the first combustion unit. Can be prevented.

[0040]

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

(Embodiment 1) FIG. 1 is a configuration diagram of a one-can, two-circuit heat source device according to Embodiment 1 of the present invention. In the figure, reference numeral 16 denotes a first combustion unit, which comprises a first burner 17 and a common burner 18. Reference numeral 19 denotes a second combustion unit, which includes a second burner 20 and a common burner 18. Reference numerals 21 and 22 denote gas shut-off valves provided in the branched gas conduit 23, and the first burner 17 and the second burner 2 are provided respectively.
Corresponds to 0. Reference numeral 24 denotes a gas proportional valve provided on the inlet side of the gas conduit 23. 25 is the first combustion unit 16 and the second combustion unit
It is a box-shaped can body provided downstream of the outer periphery of the combustion section 19.

Reference numeral 26 denotes a first heat transfer tube, which penetrates the can body 25 and is downstream of a part of the first combustion part 16 and a part of the second burner 20.
The first heat transfer tubes 26 are connected to each other by bends (not shown) as shown by arrows in the drawing so as to form a single passage. Reference numeral 27 denotes a second heat transfer tube, which is provided in two stages through the can body 25 and downstream of a part of the second combustion part 19 and the first burner 17, so that each second heat transfer tube 27 becomes a single passage. Are connected by a bend as shown by arrows in the figure. In particular, 28 is a paired heat transfer tube mainly located on the downstream side of the shared burner 18, and includes a second heat transfer tube 27A deformed to increase the joining length on the upstream side and a first heat transfer tube 26A on the downstream side. It is brazed to form an integrated joint.

Reference numeral 29 denotes a heat receiving fin, and the first heat transfer tube 26
And the second heat transfer tube 27 is fixed by penetration welding. 30A,
A slit 30B is cut into the heat receiving fin 29 so as to separate the paired heat transfer tube 28 and the first heat transfer tube 26 and the paired heat transfer tube 28 and the second heat transfer tube 27 from the upstream end to the downstream end of the heat receiving fin 29. It is formed as follows. The heat receiving fins 29 are fixed to the first heat transfer tube 26, the second heat transfer tube 27, and the paired heat transfer tubes 28, respectively.
Heat receiving fins 29B and heat receiving fins 29C are largely divided into three regions, each of which is maintained in an integrated configuration by joints 31A and 31B. Reference numeral 32 denotes an ignition means provided downstream of the common burner 18. The combustion fan 33 communicates with the first combustion unit 16, the second combustion unit 19, and the common burner 18.

Next, the isolated operation of the first combustion section 16 will be described. When the curan is opened and water is passed through the first heat transfer tube 26, the combustion fan 33 is driven to blow air from the first burner 17, the common burner 18, and the second burner 20,
At the same time, the ignition means 32 starts discharging. Subsequently, the gas proportional valve 24 is opened, the common burner 18 is ignited, and combustion starts. Next, the gas shut-off valve 21 is opened, and the fire burns from the shared burner 18 to the first burner 17, and the first combustion unit 16 starts burning. The first heat transfer tube 26 and the first heat transfer tube 26A of the paired heat transfer tube 28 recover the heat of combustion generated from the first combustion unit 16 via the heat receiving fins 29A and 29C on the downstream side of the first combustion unit 16. Then, the first warm water flows out. that time,
The gas proportional valve 24 adjusts the combustion amount so as to obtain the required first hot water (about 38 to 60 ° C.).

At this time, the slits 30B are formed in the heat receiving fins 29.
Are formed so as to separate the paired heat transfer tubes 28 and the second heat transfer tubes 27, a part of the heat received by the heat receiving fins 29C is divided into the heat receiving fins 29B and the heat receiving fins 29C.
Heat is conducted from the joint 31B to the heat receiving fin 29B. Further, since the joining portion 31B is provided at the downstream end of the heat receiving fin 29, most of the heat received by the heat receiving fin 29C portion is mainly the first heat transfer tube 2 of the upstream paired heat transfer tube 28.
Heat is recovered in 6A. That is, the amount of heat escaping to the heat receiving fins 29B is small, and the heat loss due to the air ejected from the second burner 20 is small, so that the efficiency of the single operation of the first combustion unit 16 can be maintained.

On the other hand, the amount of heating of the heat receiving fins 29B to the second heat transfer tube 27 is small, and conversely, the temperature of the residual water in the second heat transfer tube 27 is low due to the cooling by the air jetted from the second burner 20, and the scale is reduced. Clogging can be suppressed. The second heat transfer tube 27A of the paired heat transfer tubes 28 is heated by the heat received by the heat receiving fins 29C. However, the second heat transfer tube 27A
Is deformed to form a large contact surface between the first heat transfer tube 26A and the second heat transfer tube 27A, so that the second heat transfer tube 27A
The heat radiation to the first heat transfer tube 26A through which water flows is large, the temperature of the residual water in the second heat transfer tube 27A is low, and the clogging of the scale can be suppressed.

Further, compared to the conventional example, the combustion load can be reduced by burning the common burner 18 in addition to the first burner 17 without changing the size of the combustion section, so that noise can be reduced. Further, since the heat receiving fins 29C can be used as a heat receiving area, high efficiency can be achieved.

Next, the independent operation of the second combustion section 19 will be described. When the second hot water is sucked into the second heat transfer tube 27 by a pump (not shown), the combustion fan 33 is driven to blow air from the first burner 17, the common burner 18, and the second burner 20, and at the same time, The ignition means 32 starts discharging. Subsequently, the gas proportional valve 24 is opened, the common burner 18 is ignited, and combustion starts. Next, the gas shutoff valve 22 opens,
The fire burns from the common burner 18 to the second burner 20, and the second combustion unit 19 starts burning. The second heat transfer tube 27 and the second heat transfer tube 27A of the paired heat transfer tube 28 recover the heat of combustion generated from the second combustion unit 19 via the heat receiving fins 29B and 28C on the downstream side of the second combustion unit 19. Then, the second hot water circulates to a thermal terminal (not shown). At that time, the requested second
The gas proportional valve 24 adjusts the amount of combustion so as to obtain hot water.

At this time, as in the case of the single operation of the first combustion section 16, the slit 30 A is formed in the heat receiving fin 29 by the pair of heat transfer tubes 28.
And the first heat transfer tube 26, a part of the heat received by the heat receiving fin 29C is transferred from the joint 31A between the heat receiving fin 29A and the heat receiving fin 29C to the heat receiving fin 29A. Conduct. Also,
Since the joint portion 31A is provided at the downstream end of the heat receiving fin 29, most of the heat received by the heat receiving fin 29C is mainly recovered to the second heat transfer tube 27A of the upstream paired heat transfer tubes 28. That is, the amount of heat escaping to the heat receiving fins 29A is small, and the heat radiation loss due to the air ejected from the first burner 17 is small, so that the efficiency of the independent operation of the second combustion section 19 can be maintained.

On the other hand, the amount of heating of the heat receiving fins 29A to the first heat transfer tube 26 is small, and conversely, the temperature of the residual water in the first heat transfer tube 26 is low due to the cooling by the air ejected from the first burner 17, and the scale is reduced. Clogging can be suppressed. The first heat transfer tube 26A of the paired heat transfer tubes 28 is heated by the heat received by the heat receiving fins 29C. However, the second heat transfer tube 27A
Is deformed to form a large contact surface between the first heat transfer tube 26A and the second heat transfer tube 27A, so that the first heat transfer tube 26A
The heat radiation to the second heat transfer tube 27A through which water flows is large, the temperature of the residual water in the first heat transfer tube 26A is low, and the clogging of the scale can be suppressed.

The same effect can be obtained when the second heat transfer tube is provided on the upstream side. Also, slits 30A, 30B
Is not always necessary (the effect is halved).

(Embodiment 2) FIG. 2 is a partially enlarged sectional view of a one-can, two-circuit heat source device according to Embodiment 2 of the present invention. The difference from the first embodiment is that the sub-slit 34A is
And the sub-slit 34B is formed substantially in parallel with the vicinity of the end of the slit 35B toward the downstream end of the heat receiving fin 36. The components having the same reference numerals as those in the first embodiment have the same structure, and the description will be omitted.

Next, the independent operation of the first combustion section 16 will be described. When water is passed through the first heat transfer tube 26, the first combustion unit 16 starts burning. The first heat transfer tube 26 and the first heat transfer tube 26A of the paired heat transfer tube 28 recover the heat of combustion generated from the first combustion unit 16 via the heat receiving fins 36A and 36C on the downstream side of the first combustion unit 16. Then, the first warm water flows out.

At this time, since the sub-slit 34B is formed substantially in parallel with the vicinity of the end of the slit 35B toward the downstream end of the heat-receiving fin 36, a part of the heat received by the heat-receiving fin 36C is reduced by the sub-slit. 34B and slit 35
A very small and narrow joint 31B in the gap B
(Large heat resistance) and slightly conducts heat to the heat receiving fins 36B. That is, the amount of heat escaping to the heat receiving fins 36B is very small, and the heat radiation loss due to the air ejected from the second burner 20 is also very small, so that the efficiency of the single operation of the first combustion section 16 can be ensured. On the other hand, the heating amount of the heat receiving fins 36B to the second heat transfer tube 27 is extremely small, and conversely, the temperature of the residual water in the second heat transfer tube 27 is low due to the cooling by the air ejected from the second burner 20, so that the scale clogging occurs. Can be prevented.

Next, the independent operation of the second combustion section 19 will be described. When the second hot water is sucked into the second heat transfer tube 27 by a pump (not shown), the second combustion unit 19 starts burning. The second heat transfer tube 27 and the second heat transfer tube 27A of the paired heat transfer tube 28 recover the heat of combustion generated from the second combustion unit 19 via the heat receiving fins 36B and 36C on the downstream side of the second combustion unit 19. Then, the second hot water circulates to a thermal terminal (not shown).

At this time, as in the case of the single operation of the first combustion section 16, the auxiliary slit 34A is formed substantially in parallel with the vicinity of the end of the slit 35A toward the downstream end of the heat receiving fin 36, so that the heat receiving fin 36 is formed. A part of the heat received by the portion 36C is slightly conducted to the heat receiving fin 36A from the joining portion 31A (large thermal resistance) formed very small and narrow in the gap between the sub-slit 34A and the slit 35A. That is, the amount of heat escaping to the heat receiving fin 36A is very small,
Since the radiation loss due to the air ejected from the burner 17 is also very small, the efficiency of the independent operation of the second combustion section 20 can be secured. On the other hand, the amount of heating of the heat receiving fins 36A to the first heat transfer tube 26 is extremely small, and conversely, the temperature of the residual water in the first heat transfer tube 26 is low due to the cooling by the air ejected from the first burner 17, and the scale is clogged. Can be prevented.

(Embodiment 3) FIG. 3 is a partially enlarged cross-sectional view of a one-can, two-circuit heat source device according to Embodiment 3 of the present invention. The difference from the first embodiment is that a large number of round hole-shaped openings 37 are tightly opened in the gaps between the paired heat transfer tubes 39 and the first heat transfer tubes 40 and between the paired heat transfer tubes 39 and the second heat transfer tubes 41 of the heat receiving fins 38. is there. The components having the same reference numerals as those in the first embodiment have the same structure, and the description will be omitted.

Next, the isolated operation of the first combustion section will be described. When water is passed through the first heat transfer tube 40, the first combustion unit 1
6 starts burning. The first heat transfer tube 40 and the first heat transfer tube 40A of the paired heat transfer tube 39 are connected to the first combustion unit 1 via the heat receiving fins 38A and 39C on the downstream side of the first combustion unit 16.
The combustion heat generated from 6 is recovered, and the first hot water is discharged.

At this time, since a large number of openings 37B are formed in the heat receiving fins 38 in close contact with the gaps between the paired heat transfer tubes 39 and the second heat transfer tubes 41, a portion of the heat received by the heat receiving fins 38C has a full length. Heat is conducted to the heat receiving fin 38B from the joining group 42B of the heat receiving fin 38B and the heat receiving fin 38C formed small. That is, the heat receiving fins 3
Since the amount of heat escaping to the portion 8B is small and the heat loss due to the air ejected from the second burner 20 is small, the first combustion section 1
6 can maintain the efficiency of independent operation. On the other hand, heat receiving fin 3
The heating amount of the 8B portion to the second heat transfer tube 41 is small, and conversely, the temperature of the residual water in the second heat transfer tube 41 is low due to the cooling by the air ejected from the second burner 20, and the clogging of the scale can be suppressed.

Note that the same operation as the single operation of the first combustion unit 16 can be obtained also in the single operation of the second combustion unit 19. In addition, the opening does not need to have a round hole shape, and may have an elliptical shape or a rectangular shape. Further, both the openings 37A and 37B are not necessarily required (the effect is halved).

On the other hand, the heat receiving fins 38A and the heat receiving fins 38
Since the C portion and the heat receiving fins 38B and 38C are intermittently connected, the strength of the heat receiving fins 38 themselves is increased. As a result, insertion and insertion of the first heat transfer tube 40 and the second heat transfer tube 41 into the heat receiving fins 38 as compared with the first and second embodiments.
Assembly and expansion can be easily performed.

(Embodiment 4) FIG. 4 is a partially enlarged sectional view of a one-can, two-circuit type heat source device according to Embodiment 4 of the present invention. The difference from the first embodiment is that the heat receiving fin 43 is provided with a thin portion 47 in which the thickness of the gap between the paired heat transfer tube 44 and the first heat transfer tube 45 and the gap between the paired heat transfer tube 44 and the second heat transfer tube 46 is reduced by pressing. It is that you are. The components having the same reference numerals as those in the first embodiment have the same structure, and the description will be omitted.

Next, the independent operation of the first combustion section 16 will be described. The first heat transfer tubes 45 and the first heat transfer tubes 45 </ b> A of the paired heat transfer tubes 44 are connected to the heat receiving fins 43 on the downstream side of the first combustion unit 16.
The heat of combustion generated from the first combustion section 16 is recovered through the portions A and 43C, and the first hot water is discharged.

At this time, the paired heat transfer tubes 44 and the second heat transfer tubes 46
Since the thin portion 47B in which the thickness of the gap between the thin portion 47B and the heat receiving fin 43C is received has a very large thermal resistance, a part of the heat received by the heat receiving fin 43C has less heat conduction from the thin portion 47B to the heat receiving fin 43B. That is, since the amount of heat escaping to the heat receiving fins 43B is small and the heat radiation loss due to the air ejected from the second burner 20 is also small, the efficiency of the single operation of the first combustion unit 16 can be maintained. On the other hand, the amount of heating of the heat receiving fin 43B to the second heat transfer tube 46 is small, and conversely, the second heat transfer tube 4 is cooled by the air ejected from the second burner 20.
The temperature of the residual water in 6 is low, and the clogging of the scale can be suppressed.

Note that the same operation as that of the first operation of the first combustion unit 16 can be obtained also in the operation of the second combustion unit 19 alone. Further, both the thin portions 47A and 47B are not necessarily required.

On the other hand, since the heat receiving fins 43 are not provided with slits or openings as in the conventional example, the strength of the heat receiving fins 43 is ensured. As a result, the insertion, assembly, and expansion of the first heat transfer tube 45 and the second heat transfer tube 46 into the heat receiving fins 43 can be performed more easily than in the third embodiment.

(Embodiment 5) FIG. 5 is a partially enlarged cross-sectional view of a one-can, two-circuit heat source device according to Embodiment 5 of the present invention. The difference from the first embodiment is that the first heat receiving fin 48 is connected to the first heat transfer tube 4.
9 is that the second heat receiving fins 50 are fixed to the second heat transfer tubes 51 and the pair heat receiving fins 52 are fixed to the pair heat transfer tubes 53 respectively. The components having the same reference numerals as those in the first embodiment have the same structure, and the description will be omitted.

Next, the independent operation of the first combustion section 16 will be described. When water is passed through the first heat transfer tube 49, the first combustion unit 16 starts burning. Then, the first heat transfer tube 49 and the first heat receiving fin 48 are connected to the first heat transfer tube 4 of the pair of heat transfer tubes 53.
9A recovers the heat of combustion generated from the first combustion section 16 via the pair of heat receiving fins 52, and the first hot water flows out.

At this time, since the paired heat receiving fins 58 and the second heat receiving fins 50 are independent, the paired heat receiving fin portions 58
The received heat does not conduct heat to the second heat receiving fin portion 50, and naturally does not generate heat radiation loss. Therefore, the efficiency of the single operation of the first combustion unit 16 can be ensured. In addition, since the second heat transfer tube 51 of the second heat receiving fin unit 50 is not heated, scale clogging in the second heat transfer tube 51 does not occur.

Note that the same operation as that of the first operation of the first combustion unit 16 can be obtained also in the operation of the second combustion unit 19 alone. Further, the paired heat receiving fins 52 may be formed integrally with the first heat receiving fins 48 or the second heat receiving fins 50 (the effect is reduced by half).

(Embodiment 6) FIG. 6 is a partially enlarged view of the upstream end heat receiving fin side of a one-can, two-circuit heat source device according to Embodiment 6 of the present invention. The difference from the fifth embodiment is that the first heat receiving fins 54 and the second heat receiving fins 55 are made thicker, and conversely, the paired heat receiving fins 56 are made thinner. The components having the same reference numerals as those of the fifth embodiment have the same structure, and the description is omitted.

Next, the isolated operation of the first combustion section 16 will be described. When water is passed through the first heat transfer tube 49, the first combustion unit 16 starts burning. Then, the first heat transfer tube 49 connects the first heat receiving fin 54 to the first heat transfer tube 49 of the paired heat transfer tube 53.
A is in the first combustion unit 1 via the pair of heat receiving fins 56, respectively.
The combustion heat generated from 6 is recovered, and the first hot water is discharged.

At this time, since the thickness of the paired heat receiving fins 56 is made smaller than that of the first heat receiving fins 54, the fin efficiency of the paired heat receiving fins 56 is lower than the fin efficiency of the first heat receiving fins 54. Therefore, since the heat received by the paired heat receiving fins 56 is smaller than the heat received by the first heat receiving fins 54, the amount of heating of the second heat transfer tubes 51A of the paired heat transfer tubes 53 is also reduced. As a result, the temperature of the residual water in the second heat transfer tube 51A is low, and clogging of the scale can be prevented. Although the heat received by the pair of heat receiving fins 56 is small,
Since the heat received by the heat receiving fins 54 is large, the efficiency of the single operation of the first combustion unit 16 can be maintained.

The same effects as those of the first operation of the first combustion unit 16 can be obtained also in the operation of the second combustion unit 19 alone.

(Embodiment 7) FIG. 7 is a partially enlarged view of the upstream end heat receiving fin side of a one-can, two-circuit heat source device in Embodiment 7 of the present invention. The difference from the fifth embodiment is that the number of the pair of heat receiving fins 57 is reduced,
That is, the number of heat receiving fins 59 is increased. Example 5
Those having the same reference numerals have the same structure, and a description thereof will be omitted.

Next, the independent operation of the first combustion section 16 will be described. When water is passed through the first heat transfer tube 49, the first combustion unit 16 starts burning. Then, the first heat transfer tube 49 connects the first heat receiving fin 58 to the first heat transfer tube 49 of the paired heat transfer tube 53.
A is connected to the first combustion unit 1 via the pair of heat receiving fins 57, respectively.
The combustion heat generated from 6 is recovered, and the first hot water is discharged.

At this time, since the number of the paired heat receiving fins 57 is smaller than that of the first heat receiving fins 58, the heat receiving area of all the paired heat receiving fins 57 is small, and
Is smaller than the heat received by all the first heat receiving fins 58. As a result, the amount of heating of the second heat transfer tube 51A of the paired heat transfer tubes 53 is also reduced, so that the second heat transfer tube 51A
The temperature of residual water in the inside is low, and scale clogging can be prevented.

Note that the same operation as the single operation of the first combustion unit 16 can be obtained also in the single operation of the second combustion unit 19.

[0079]

As described above, the present invention has the following advantageous effects.

According to the first aspect of the present invention, the slit is formed in the heat receiving fin so as to separate the paired heat transfer tube and the first heat transfer tube or the paired heat transfer tube and the second heat transfer tube. It is possible to maintain the efficiency of the single operation of the combustion unit and to suppress clogging of the scale in the first heat transfer tube or the second heat transfer tube.

According to the second aspect of the present invention, since the sub-slit is provided near the end of the slit, the first combustion section or the second combustion section is provided.
Ensuring the efficiency of the single operation of the combustion section and the first heat transfer tube or the second
The clogging of the scale in the heat transfer tube can be prevented.

According to the third aspect of the present invention, the openings are closely opened in the gap between the paired heat transfer tubes and the first heat transfer tube or between the paired heat transfer tubes and the second heat transfer tube, so that the first combustion portion or the second combustion portion is provided. , The efficiency of independent operation of the first heat transfer tube or the suppression of scale clogging in the first heat transfer tube or the second heat transfer tube can be improved. Further, since the heat receiving fins are intermittently connected in the gap between the paired heat transfer tubes and the first heat transfer tubes or between the paired heat transfer tubes and the second heat transfer tubes, the strength of the heat receiving fins themselves is high, and the first heat transfer tubes to the heat receiving fins are strong. And the insertion, assembly, and expansion of the second heat transfer tube can be easily performed.

According to the fourth aspect of the present invention, the thin portion is provided by forming the gap between the paired heat transfer tube and the first heat transfer tube or the gap between the paired heat transfer tube and the second heat transfer tube to be thin. It is possible to maintain the isolated operation efficiency of the section or the second combustion section and to suppress the clogging of the scale in the first heat transfer pipe or the second heat transfer pipe. Further, since the heat receiving fin is not provided with a slit or an opening, the strength of the heat receiving fin is secured, and the first heat receiving fin is not provided with the heat receiving fin.
Insertion, assembly, and expansion of the heat transfer tube and the second heat transfer tube can be easily performed.

According to the fifth aspect of the present invention, the first heat receiving fin, the second heat receiving fin, and the paired heat receiving fin are made independent of each other, so that the efficiency of independent operation of the first combustion section or the second combustion section can be ensured and the first heat reception fin and the second combustion section can be operated independently. Scale clogging in the heat transfer tube or the second heat transfer tube can be prevented.

According to the sixth aspect of the present invention, the thickness of the pair of heat receiving fins is formed to be thinner than the thickness of the first heat receiving fin or the second heat receiving fin. Scale clogging in the heat tube can be prevented.

According to the seventh aspect of the present invention, since the number of the pair of heat receiving fins is smaller than that of the first or second heat receiving fins, the scale in the first and second heat transfer tubes of the pair of heat transfer tubes is reduced. Clogging can be prevented.

[Brief description of the 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.

FIG. 2 is a partially enlarged cross-sectional view of a one-can, two-circuit heat source device according to a second embodiment of the present invention.

FIG. 3 is a partially enlarged cross-sectional view of a one-can, two-circuit heat source device according to a third embodiment of the present invention.

FIG. 4 is a partially enlarged cross-sectional view of a one-can, two-circuit heat source device according to a fourth embodiment of the present invention.

FIG. 5 is a partially enlarged cross-sectional view of a one-can, two-circuit heat source device according to a fifth embodiment of the present invention.

FIG. 6 is a partially enlarged view of an upstream end heat receiving fin side of a one-can two-circuit heat source device according to a sixth embodiment of the present invention.

FIG. 7 is a partially enlarged view of an upstream end heat receiving fin side of a one-can two-circuit heat source device according to a seventh embodiment of the present invention.

FIG. 8 is a configuration diagram of a conventional one-can, two-circuit heat source unit.

[Explanation of symbols]

 16 First combustion unit 19 Second combustion unit 25 Can body 26, 40, 45, 49 First heat transfer tube 27, 41, 46, 51 Second heat transfer tube 28, 39, 44, 53 Pair heat transfer tube 29, 36, 38 , 43 Heat receiving fins 30, 35 Slits 34 Sub slits 37 Openings 47 Thin portions 48, 54, 58 First heat receiving fins 50, 55, 59 Second heat receiving fins 52, 56, 57 Pair heat receiving fins

Continued on the front page (72) Inventor Kazuya Ariyama 1006 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. F-term (reference) 3L034 BA27 BA29 BB03 3L036 AA06 AA07

Claims (7)

[Claims] A first combustion section and a second combustion section provided adjacent to each other; a can body provided downstream of the two combustion sections; and a downstream side of the first combustion section passing through the can body. Multiple first
A heat transfer tube, a plurality of second heat transfer tubes penetrating the can body and provided on the downstream side of the second combustion portion, and the first heat transfer tube near a boundary between the first combustion portion and the second combustion portion. A pair of heat transfer tubes provided in contact with the heat tube and the second heat transfer tube, a heat receiving fin penetratingly fixed to the first heat transfer tube and the second heat transfer tube,
A one-can-two-circuit heat source device, wherein the heat receiving fins include slits formed to separate the paired heat transfer tubes and the first heat transfer tubes or the paired heat transfer tubes and the second heat transfer tubes. 2. The one-circuit two-circuit heat source device according to claim 1, wherein a sub-slit is provided in the heat receiving fin substantially in parallel with the vicinity of the end of the slit. 3. A first combustion section and a second combustion section provided adjacent to each other, a can body provided downstream of the two combustion sections, and a downstream side of the first combustion section passing through the can body. Multiple first
A heat transfer tube, a plurality of second heat transfer tubes penetrating the can body and provided on the downstream side of the second combustion portion, and the first heat transfer tube near a boundary between the first combustion portion and the second combustion portion. A pair of heat transfer tubes provided in contact with the heat tube and the second heat transfer tube, a heat receiving fin penetratingly fixed to the first heat transfer tube and the second heat transfer tube,
A one-can, two-circuit heat source device, wherein the heat receiving fins include a plurality of openings that are closely opened in a gap between the paired heat transfer tube and the first heat transfer tube or the gap between the paired heat transfer tube and the second heat transfer tube. 4. A first combustion section and a second combustion section provided adjacent to each other, a can body provided downstream of the two combustion sections, and a downstream side of the first combustion section passing through the can body. Multiple first
A heat transfer tube, a plurality of second heat transfer tubes penetrating the can body and provided on the downstream side of the second combustion portion, and the first heat transfer tube near a boundary between the first combustion portion and the second combustion portion. A pair of heat transfer tubes provided in contact with the heat tube and the second heat transfer tube, a heat receiving fin penetratingly fixed to the first heat transfer tube and the second heat transfer tube,
A one-can, two-circuit heat source device, comprising: the heat receiving fins; and a thin portion in which a thickness of a gap between the paired heat transfer tube and the first heat transfer tube or the gap between the paired heat transfer tube and the second heat transfer tube is reduced. 5. A first combustion section and a second combustion section provided adjacent to each other, a can body provided downstream of the two combustion sections, and a downstream side of the first combustion section passing through the can body. Multiple first
A heat transfer tube, a plurality of second heat transfer tubes penetrating the can body and provided on the downstream side of the second combustion portion, and the first heat transfer tube near a boundary between the first combustion portion and the second combustion portion. A paired heat transfer tube provided in contact with the heat tube and the second heat transfer tube, a first heat receiving fin penetratingly fixed to the first heat transfer tube except for the paired heat transfer tube, and a second heat transfer fin except for the paired heat transfer tube. A one-can, two-circuit heat source device comprising: a second heat receiving fin penetratingly fixed to a heat pipe; and a pair of heat receiving fins penetratingly fixed to the paired heat transfer tubes. 6. The pair of heat receiving fins according to claim 5, wherein the thickness of the pair of heat receiving fins is smaller than that of the first heat receiving fin or the second heat receiving fin.
Can two-circuit heat source device. 7. The one-can, two-circuit heat source device according to claim 5, wherein the number of paired heat receiving fins is smaller than that of the first heat receiving fin or the second heat receiving fin.