JP6626662B2 - Heat exchanger and heat source equipment - Google Patents

Description

The present invention relates to a heat exchange technique using, for example, latent heat of fuel exhaust for heat exchange.

  The hot water supply device is provided with a heat exchanger that exchanges heat of the combustion exhaust gas of the fuel gas. The heat exchanger includes a primary heat exchanger for exchanging sensible heat of the combustion exhaust gas and a secondary heat exchanger for exchanging latent heat of the combustion exhaust gas after heat exchange in the primary heat exchanger. Since the secondary heat exchanger recovers latent heat from the combustion exhaust gas, it has the advantages of increasing the heat exchange efficiency and lowering the temperature of the combustion exhaust gas discharged to the outside air.

  In the secondary heat exchanger, the feed water before heat exchange in the primary heat exchanger is preheated by the latent heat of the combustion exhaust, and the heat medium used as the heat source is preheated by the latent heat of the combustion exhaust before the primary heat exchange. There are usage forms.

In order to improve the heat efficiency of such heat exchange, a configuration is known in which a convex wall that disturbs the flow of combustion exhaust is provided at the ceiling of a passage space through which combustion exhaust flows (for example, Patent Document 1). Further, in a heat exchanger including a plurality of heat exchange tubes, there is known a heat exchanger in which a heat exchange tube is partitioned by a straightening plate and a drain discharge side is inclined downward (for example, Patent Document 2).

JP 2014-70800 A JP 2014-119225 A

  By the way, the combustion exhaust gas after the primary heat exchange is led to the secondary heat exchanger on the combustion chamber side, and it is assumed that the heat of the combustion exhaust gas is entangled with the secondary heat exchange pipe to perform efficient heat exchange. ing.

  However, since the flow of the combustion exhaust gas flows to the lower side of the flow path resistance on the case ceiling side where the heat exchange tubes are not densely packed, the high-temperature exhaust flow flows to the downstream side, and the exhaust gas temperature distribution becomes uneven. There are issues. Exhaust heat tends to be higher at the upper part of the exhaust flow flowing through the exhaust passage. When the exhaust flow passing through the exhaust passage becomes uneven, the heat exchange among the heat exchange tubes varies, and even one heat exchange tube has a variation in the temperature distribution within the width. As a result, there is a problem that heat exchange varies, and the expected heat exchange efficiency cannot be obtained.

  If a high-temperature exhaust stream flows downstream and a heat exchange pipe is used downstream for heating water supply, there will be problems such as overheating of the fluid to be heated such as water supply when water is not supplied, causing partial boiling. is there.

  If such an exhaust gas stream is left, the heat exchange efficiency of the secondary heat exchanger is low, the heat recovery from the combustion exhaust gas is insufficient, and the exhaust gas temperature cannot be lowered.

Then, in view of the above-mentioned problems, the present invention is to improve the heat exchange efficiency of the combustion exhaust gas and improve the heat recovery rate of the combustion exhaust gas.

In order to achieve the above object, according to one aspect of the heat exchanger of the present invention, a housing through which combustion exhaust gas flows , a first heat exchange unit having a plurality of heat exchange tubes, and the first heat exchange unit And a second heat exchange section of a circulation system different from the heat exchange section, wherein a plurality of heat exchange tubes for exchanging heat between the combustion exhaust and the fluid to be heated are arranged in the housing, and the heat exchange section is at least Separated into two branches, the combustion exhaust flowing through the casing is divided into a plurality of exhaust streams, and flows into each of the branch paths. A branching section for performing heat exchange, and in one of the branching paths, the exhaust stream after heat exchange in the branching section is subjected to heat exchange between the heat exchange pipe and the combustion exhaust, and then flows to the outside air; A duct section for flowing the exhaust gas flow after the heat exchange in the branch flow section to the outside air in the branch flow path. And a mood flow member, provided with the diverter to the first heat exchange unit, Re with the duct portion to the second heat exchanger.

In the heat exchanger, the exhaust gas diverting member includes the detachable diverting portion and the duct portion, and the diverting portion is arranged on the first heat exchange portion side, and the duct portion is the first heat exchanging portion. It may be arranged on the heat exchange part side and connected to the branch part .

In order to achieve the above object , according to one aspect of the heat exchanger of the present invention, there is provided a housing for flowing combustion exhaust, and a first heat exchanger for flowing a first heated fluid upstream of the combustion exhaust. A pipe, and a second heat exchange pipe that allows a second heated fluid having a different circulation path from the first heated fluid to flow downstream of the combustion exhaust, and that the combustion exhaust and the second A heat exchange section in which a plurality of heat exchange tubes for exchanging heat with the heated fluid are arranged, and the heat exchange section is separated into at least two branches, and the combustion exhaust gas flowing through the housing is converted into a plurality of exhaust streams. Dividing and flowing into each of the branch channels, a branching portion for performing heat exchange between the heat exchange pipe and the combustion exhaust for each exhaust flow flowing through each branching channel, and after heat exchange in the branching portion in one of the branching channels The exhaust gas is subjected to heat exchange between the heat exchange tube and the combustion exhaust gas, and then flows to the outside air. Good lever and an exhaust diversion member and a duct portion flowing the exhaust stream after the heat exchange with the outside air by the diverter in the branch passage.

  In the heat exchanger, the exhaust gas diverting member includes the detachable diversion portion and the duct portion, the diversion portion is disposed on the first heat exchange tube side, and the duct portion is the second diversion portion. It may be arranged on the heat exchange tube side and connected to the branch part.

In order to achieve the above object, according to one aspect of the heat source device of the present invention, the heat source is provided to heat a fluid to be heated, and at least hot water supply, bathtub water heating or heating is performed using the fluid to be heated. .

  According to the present invention, the following effects can be obtained.

  (1) The exhaust gas diverting member divides the combustion exhaust gas in the housing into a plurality of exhaust gas flows, and the divided air flow can be used to make the exhaust gas flow uniform. It can be carried out.

  (2) By providing an exhaust diverting member in a housing including a plurality of heat exchange tubes that exchange heat between the combustion exhaust and the fluid to be heated, the combustion exhaust is divided into a plurality of exhaust flows, and a heat exchange tube is provided for each exhaust flow. And heat exchange of the combustion exhaust is performed, so that heat exchange is possible by dispersing the combustion exhaust, heat recovery of the combustion exhaust is improved, and heat exchange efficiency is improved.

(3) It is possible to prevent the exhaust stream that has not undergone heat exchange on the upstream side from flowing to the downstream side, and to avoid partial boiling of the fluid to be heated in the heat exchange pipe on the downstream side.

It is a figure showing the secondary heat exchange unit concerning a 1st embodiment of the present invention. It is a figure showing a secondary heat exchange unit concerning a 2nd embodiment of the present invention. It is a figure showing a secondary heat exchange unit concerning a 3rd embodiment of the present invention. It is a figure showing a heat source machine concerning a 4th embodiment of the present invention. It is a sectional view showing the heat exchanger concerning a 1st example of the present invention. It is a perspective view which shows the heating secondary heat exchanger provided with an exhaust gas distribution plate. It is a perspective view which shows the housing | casing provided with a heating secondary heat exchanger, an exhaust distribution plate, and an exhaust duct. It is a perspective view which shows a part of exhaust distribution plate of a secondary heat exchange unit. It is a perspective view which shows the modification of the connection part of an exhaust distribution plate. It is a figure showing a heat source machine concerning a 2nd example of the present invention. It is a figure showing a hot water supply device concerning a 3rd example of the present invention.

[First Embodiment]

  FIG. 1 shows a secondary heat exchange unit according to the first embodiment. The configuration according to FIG. 1 is an example of the heat exchanger of the present invention, and is not limited to the configuration according to the present invention.

  The secondary heat exchange unit 2 is provided with a housing 4 forming an exhaust space for the combustion exhaust EG. An exhaust introduction unit 6 is provided on the bottom of the housing 4, and the combustion exhaust EG guided into the housing 4 from the exhaust introduction unit 6 flows through the housing 4 to the discharge unit 8, and is discharged to the outside air. Is done.

A first heat exchange unit 10-1 is provided on the upstream side of the combustion exhaust gas EG, and a second heat exchange unit 10-2 is provided on the downstream side thereof. The heat exchange units 10-1 and 10-2 are examples of a heat exchange unit. The heat exchange unit 10-1 includes a plurality of first heat exchange tubes 12-11 and 12-12, and the heat exchange unit 10-2 includes a plurality of second heat exchange tubes 12-2. The first fluid to be heated flows through the heat exchange tubes 12-11 and 12-12 to exchange heat between the fluid M to be heated and the combustion exhaust gas EG. The second fluid to be heated flows through the heat exchange section 10-2, and the fluid to be heated and the combustion exhaust gas EG exchange heat. If the heat exchange unit 10-1 is, for example, a heating heat exchanger, the fluid to be heated is, for example, the heating water M. If the heat exchange unit 10-2 is, for example, a hot water supply heat exchanger, the fluid to be heated is, for example, hot water W.

  A single or a plurality of exhaust gas distribution members 16 are arranged in the heat exchange units 10-1 and 10-2. In this example, a single exhaust shunt member 16 is arranged and a plurality of independent shunt channels are formed for the exhaust flow in the housing 4. In this example, a first shunt channel is provided above the exhaust shunt member 16, A second branch channel is formed below the exhaust branch member 16. In this example, the combustion exhaust gas EG is divided into a first exhaust gas flow EG1 and a second exhaust gas flow EG2, and the exhaust gas flow EG1 is divided above the exhaust gas dividing member 16, and the exhaust gas EG2 is divided below the exhaust gas dividing member 16. Flows into the branch channel.

  As an example, the exhaust flow dividing member 16 includes a flow dividing section 16-1 on the heat exchange section 10-1 side and a duct section 16-2 on the heat exchange section 10-2 side. The branching section 16-1 separates the heat exchange pipe 12-1 into a heat exchange pipe 12-11 and a heat exchange pipe 12-12, divides the combustion exhaust EG into an exhaust stream EG1 and an exhaust stream EG2, and separates the exhaust stream EG1. , EG2 to perform heat exchange with the fluid to be heated. In this example, since the number of the heat exchange tubes 12-1 is 14 in total, the heat exchange tubes 12-11 are 11 heat exchange tubes which are a part of the total of 14 tubes, and the heat exchange tubes 12-12 are The three heat exchange tubes, which are a part of the total of 14 tubes, are not limited thereto.

  The duct part 16-2 discharges the exhaust EG2 flowing into the lower surface side of the branch part 16-1 to the discharge part 8 independently of the duct part 16-2 without intersecting with the exhaust flow EG1 on the heat exchange part 10-2 side. Let it.

  Instead of a single exhaust gas dividing member 16, two or more exhaust gas dividing members 16 may be provided to divide the combustion exhaust gas EG into a plurality of systems of exhaust gas flow. If a plurality of exhaust flow dividing members 16 are provided, a plurality of exhaust flows EG1, EG2,.

  The ceiling plate 4-1 on the heat exchange unit 10-2 side is provided with a step 4-2 between the ceiling plate 4-1 and the heat exchange unit 10-1, and is inclined downward toward the discharge unit 8 side. Similarly, the face plate 4-3 is inclined downward toward the discharge unit 8 side. Drain generated by latent heat recovery by heat exchange of the heat exchange units 10-1 and 10-2 flows along the bottom plate 4-3 and is stored in the drain reservoir 14 that forms or is located at the end of the bottom plate 4-3. .

<Effect of First Embodiment>

  According to such a configuration, the following effects can be obtained.

  (1) Since a plurality of branch channels are formed in the exhaust space of the housing 4 by the exhaust branch member 16, the combustion exhaust EG is split into the plurality of exhaust streams EG1 and EG2, rectified, and heat exchange can be performed for each exhaust stream. In addition, it is possible to prevent unevenness in the temperature distribution of the combustion exhaust gas and variations in the heat exchange efficiency, thereby improving the heat exchange efficiency.

  (2) The combustion exhaust gas EG guided from the exhaust gas introduction unit 6 to the housing 4 can be divided into at least two systems by the exhaust gas distribution member 16 and can be discharged from the discharge unit 8 to the outside air. While the exhaust heat quantity tends to be higher in the upper part of the exhaust space, by dividing the combustion exhaust into a plurality of exhaust streams in this way, the portion having a small heat quantity only performs heat exchange with some heat exchange tubes, The other exhaust gas can be diffused in the passage by the amount of the reduced exhaust gas due to the passage shape and the branch flow, and the heat exchange efficiency in the other heat exchange tubes can be increased, and the heat exchange efficiency can be increased as a whole.

(3) With respect to the combustion exhaust gas EG on the heat exchange unit 10-1 side, the exhaust gas flow EG1 diverted above the exhaust gas distribution member 16 is exhausted through the heat exchange unit 10-2. The exhaust gas flow EG2 that has diverted to the lower side of the exhaust gas distribution member 16 flows out to the outside air through the duct portion 16-2 without crossing the exhaust gas flow EG1. Therefore, the exhaust gas flow EG1 flowing to the heat exchange unit 10-2 can be reduced by the amount of the exhaust gas flow EG2 with respect to the combustion exhaust gas EG on the heat exchange unit 10-1 side. The heat exchange pipe 12-11 of the heat exchange unit 10-1 and the exhaust gas flow EG1 on the heat exchange unit 10-2 side have a combustion exhaust EG.
EG = EG1 + EG2 (1)
Because
EG1 = EG−EG2 (2)
It becomes. The flow velocity of the exhaust flow EG1 can be reduced by the amount of the divided exhaust flow EG2. Thereby, the opening cross section of the heat exchange unit 10-2 through which the exhaust gas flow EG1 on the heat exchange unit 10-2 side flows can be reduced, so that the secondary heat exchange unit 2 can be reduced in size and the heat exchange rate can be increased.

  (4) The exhaust gas flow EG2 divided by the exhaust gas dividing member 16 can be reliably brought into contact with the heat exchange tube 12-12 below the heat exchange unit 10-1 on the lower surface side of the flow dividing unit 16-1. The heat exchange efficiency on the heat exchange tube 12-12 side can be improved.

  (5) As a result of diverting the exhaust flow EG2 by the exhaust diverting member 14, the flow velocity of the exhaust flow EG1 can be reduced, and the intersection rate between the heat exchange pipe 12-11 on the heat exchange section 10-1 side and the combustion exhaust EG1 increases. The heat exchange efficiency in the heat exchange unit 10-1 can be improved.

  (6) By reducing the flow rate of the exhaust gas flow EG1 passing through the heat exchange unit 10-1, the intersection rate of the heat exchange unit 10-2 with the heat exchange tube 12-2 is increased, and the recovery rate of the latent heat of the combustion exhaust gas EG1 is increased. Enhanced.

  (7) In the exhaust gas flow EG2 divided by the exhaust gas dividing member 16, the flow dividing portion 16-1 is inclined downward from the inlet side toward the heat exchange portion 10-2, and the duct portion 16-2 is opened to the outside air. Therefore, the exhaust flow EG2 can be released to the outside air without decreasing the flow velocity, and the exhaust resistance of the combustion exhaust EG does not increase.

  (8) Since the branching section 16-1 protrudes toward the exhaust introduction section 6, the exhaust flow EG2 of the combustion exhaust EG guided into the housing 4 can be efficiently guided to the lower side of the branching section 16-1. Also, the heat exchange rate can be increased below the branching section 16-1.

  (9) The exhaust flow dividing member 16 can be integrally attached to the bottom surface side of the housing 4, and the rigidity and strength of the housing 4 can be increased.

  (10) The exhaust path narrowed by the exhaust flow dividing member 16 is expanded in the heat exchange section 10-2 on the downstream side, and the fluid resistance is reduced. As a result, the entanglement of the combustion exhaust with the heat exchange pipe 12-2 is promoted. Higher heat exchange efficiency can be realized.

[Second embodiment]

  FIG. 2 shows a secondary heat exchange unit according to the second embodiment. 2, the same parts as those in FIG. 1 are denoted by the same reference numerals.

  In the first embodiment, the exhaust gas diverting member 16 is installed on the bottom plate 4-3 side of the housing 4, but is installed near the ceiling plate 4-1 side as shown in FIG. -2 may be arranged in parallel with the ceiling plate 4-1.

  With such a configuration, the same effect as in the first embodiment can be obtained.

[Third Embodiment]

  FIG. 3 shows a secondary heat exchange unit according to the third embodiment. 3, the same parts as those in FIG. 1 are denoted by the same reference numerals.

  In the above-described embodiment, the exhaust air diverting member 16 is installed near the ceiling plate 4-1 or the bottom plate 4-3 of the housing 4, and the exhaust space in which the heat exchange pipe 12-2 is not installed in the duct portion 16-2. Was formed. On the other hand, as shown in FIG. 3, by arranging the exhaust diverting member 16 in the middle part of the housing 4, the diverting section 16-1 connects the heating secondary heat exchange pipe 12-1 to the first secondary heat exchange pipe. An exchange pipe 12-11 and a second secondary heat exchange pipe 12-12 are bisected, and the heat exchange pipe 12-2 is divided by the duct portion 16-2 into a first hot water supply secondary heat exchange pipe 12-21 and a second secondary heat exchange pipe 12-21. It is good also as composition which divides into hot water supply secondary heat exchange pipes 12-22. It is also possible to adopt a configuration in which each of the exhaust flows EG1 and EG2 flowing in the two divided channels on the duct section 16-2 side performs independent heat exchange. Also in this embodiment, a plurality of exhaust flow dividing members 16 are provided and divided into three or more heat exchange pipe groups, and the combustion exhaust EG is divided into three or more exhaust flows EG1, EG2,. Heat exchange may be performed individually.

[Fourth Embodiment]

  FIG. 4 shows a heat source device according to the fourth embodiment. The heat source unit 18 is an example of a one-can, three-water type heat source unit according to the first embodiment. In the heat source unit 18, the secondary heat exchange unit 2 is provided on the ceiling of the combustion chamber 20. The combustion chamber 20 is provided with a primary heat exchanger 24 together with a burner 22. For example, the heat exchange tube 26 of the primary heat exchanger 24 is connected to the heat exchange tube 12-1 of the secondary heat exchange unit 10-1, and the heating water M that has passed through the heat exchange tube 12-1 flows therethrough. Let it. An air supply fan 28 for supplying combustion air to the burner 22 is provided below the combustion chamber 20.

  In the heat source unit 18, the combustion exhaust gas EG generated by burning the fuel gas G by the burner 22 is discharged from the combustion chamber 20 through the secondary heat exchange unit 2 to the outside air by the supply of the supply fan 28. You. When the combustion exhaust gas EG passes through the heat exchange pipe 26 of the primary heat exchanger 24, primary heat exchange with, for example, the heating water M flowing through the heat exchange pipe 26 is performed. The combustion exhaust gas EG that has passed through the heat exchange pipe 26 flows into the housing 4 from the exhaust gas inlet 6 of the secondary heat exchange unit 2, and the secondary heat exchange unit 2 performs secondary heat exchange. The heat exchange in the secondary heat exchange unit 2 has been described above and will not be described.

According to such a configuration, the effect of the secondary heat exchange unit described above can be obtained, the heat efficiency of the heat source device 18 can be increased, and the size can be reduced.

<First embodiment>

  FIG. 5 shows a cross section of the secondary heat exchange unit 2 according to the first embodiment. In the secondary heat exchange unit 2, the same parts as those in FIG. 1 are denoted by the same reference numerals.

  The housing 30 is formed of, for example, a highly rigid metal plate such as a stainless steel plate. The ceiling plate 32 of the housing 30 is formed with an overhang portion 36 which is inclined downward toward the exhaust port 34. The overhang portion 36 is formed on an inclined surface parallel to the bottom portion of the housing 30 by changing the height.

  An exhaust inlet 38 is formed on the bottom surface of the housing 30. The exhaust inlet 38 has an orbiting wall 40 formed inside the housing 30 and an exhaust guide 42. The exhaust guide section 42 is a member for guiding the combustion exhaust EG entering the exhaust inlet 38 to the space 43 of the housing 30. Therefore, the exhaust introduction port 38, the orbiting wall 40, and the exhaust guide section 42 are examples of the exhaust introduction section 6.

  Inside the housing 30, a heating secondary heat exchanger 44-1 is arranged on the upstream side of the flow of the combustion exhaust gas EG and a hot water supply secondary heat exchanger 44-2 is arranged on the downstream side as an example of a heat exchange section. I have. The heating secondary heat exchanger 44-1 is an example of the first heat exchange unit 10-1, and the hot water supply secondary heat exchanger 44-2 is an example of the second heat exchange unit 10-2.

  An exhaust distribution plate 46-1 is provided on the side of the heating secondary heat exchanger 44-1. The exhaust duct 46-2 connected to the exhaust distribution plate 46-1 is connected to the hot water supply secondary heat exchanger 44-2. is set up. The exhaust distribution plate 46-1 and the exhaust duct 46-2 are examples of the exhaust distribution member 16, and are formed of, for example, a metal plate such as a stainless steel plate. The exhaust distribution plate 46-1 and the exhaust duct 46-2 may be formed of a nonflammable material plate instead of a metal plate. The exhaust gas distribution plate 46-1 separates the heating secondary heat exchange pipe 48-1 into a first heating secondary heat exchange pipe 48-11 and a second heating secondary heat exchange pipe 48-12, and burns. The flow of the exhaust gas EG is divided into the exhaust gas flows EG1 and EG2. The exhaust duct 46-2 guides the exhaust flow EG2 to the exhaust port 34 without intersecting with the exhaust flow EG1 flowing on the side of the hot water supply secondary heat exchange pipe 48-2 of the hot water supply secondary heat exchanger 44-2.

<Heating secondary heat exchanger 44-1, exhaust distribution plate 46-1 and exhaust duct 46-2>

  As shown in FIG. 6A, the heating secondary heat exchanger 44-1 is provided with a pair of header portions 50R and 50L, and a plurality of heating secondary heat exchange tubes 48- are provided between the header portions 50R and 50L. 11, 48-12 are provided. An exhaust distribution plate 46-1 is provided between the heating secondary heat exchange tubes 48-11 and 48-12, and the exhaust distribution plate 46-1 is bent downward from the inclined surface of the exhaust distribution plate 46-1. A front wall portion 52 is formed, and an insertion portion 54 and a leg portion 56 to be inserted into the exhaust duct 46-2 are formed on the front wall portion 52.

  FIG. 6B shows an enlarged cross section of the VIB part in FIG. At the front of the exhaust duct 46-2, an insertion portion 54 and a leg 56 on the front wall 52 of the exhaust distribution plate 46-1 are inserted, and the exhaust distribution plate 46-1 is connected to the exhaust distribution plate 46-1. The lower exhaust stream EG2 is guided to the exhaust duct 46-2.

  FIG. 7 shows the housing 30 in which the heating secondary heat exchanger 44-1, the exhaust gas distribution plate 46-1, and the exhaust duct 46-2 are installed.

  The exhaust duct 46-2 is formed of, for example, a single metal plate such as stainless steel, and includes a cylindrical portion 58 connected to the exhaust distribution plate 46-1. The cylindrical portion 58 forms a flat rectangular cylindrical body with the bottom surface of the housing 30. The cylindrical portion 58 is open to the drain reservoir 60 side of the housing 30. A support portion 64 is formed on each side wall portion 62 of the cylindrical portion 58 so as to form a plane parallel to the bottom surface of the housing 30, and each support portion 64 is fixed to the bottom surface of the housing 30 by a screw or the like.

  As shown in FIG. 8A, the side wall portion 62 of the cylindrical portion 58 is extended and closely attached to the side surface portion of the header 50L. By closely attaching the side wall portion 62 of the cylindrical portion 58 to the side surface portion of the header 50L in this manner, the connectivity between the exhaust distribution plate 46-1 and the exhaust duct 46-2 is increased, and the exhaust distribution plate 46-1 and the exhaust duct 46 are provided. The airtightness of the connection between -2 is maintained.

  FIG. 8B is an enlarged view of the portion VIIIB of FIG. 8A viewed from above. When this connection structure is viewed from above the header 50L, the end of the exhaust distribution plate 46-1 is surrounded by the exhaust duct 46-2. An exhaust inlet 38 is opened below the heating secondary heat exchanger 44-1. The combustion exhaust EG guided from the exhaust inlet 38 flows into the heating secondary heat exchanger 44-1.

  As shown in FIG. 9, the exhaust distribution plate 46-1 may have a simple structure in which an insertion portion 54 is formed in the front wall portion 52 and the insertion portion 54 is inserted into the exhaust duct 46-2. In this case, in order to maintain the airtightness of the connecting portion of the exhaust duct 46-2, a close wall portion or the like for increasing the close contact with the exhaust distribution plate 46-1 may be provided on the exhaust duct 46-2 side. .

<Effects of First Embodiment>

  According to the secondary heat exchange unit 2, the following effects can be obtained.

  (1) The opening cross section of the exhaust space on the side of the heating secondary heat exchanger 44-1 is divided into an upper side and a lower side of the exhaust distribution plate 46-1. It is narrower than the secondary heat exchanger 44-2 side, in other words, the opening cross section on the hot water supply secondary heat exchanger 44-2 side is wider than the opening cross section on the upper side of the exhaust gas distribution plate 46-1. As a result, the exhaust gas flow EG1 diverted to the upper side of the exhaust gas distribution plate 46-1 has a flow velocity higher than that of the combustion exhaust EG that is the source flow and that of the exhaust flow EG1 that is closer to the space 43 side of the heating secondary heat exchanger 44-1. And the passage time of the exhaust gas EG1 and the hot water supply secondary heat exchanger 44-2 becomes longer, and the heat exchange efficiency can be increased accordingly.

  (2) Since the opening cross section of the exhaust space on the heating secondary heat exchanger 44-1 side is divided into an upper side and a lower side of the exhaust distribution plate 46-1, the upper opening cross section of the exhaust distribution plate 46-1 is The hot water supply secondary heat exchanger 44-2 side can be made narrower, whereby the opening cross section on the hot water supply secondary heat exchanger 44-2 side is narrowed by the overhang portion 36 of the ceiling plate 32. That is, the volume of the hot water supply secondary heat exchanger 44-2 can be reduced, which contributes to the downsizing of the secondary heat exchange unit 2.

  (3) The exhaust gas flow EG2 diverted to the lower side of the exhaust gas distribution plate 46-1 is compared with the combustion exhaust EG which is the source flow, and compared with the space 43 side of the heating secondary heat exchanger 44-1. Since the flow velocity is reduced and the opening cross section on the exhaust duct 46-2 side is narrower than the opening cross section on the lower side of the exhaust distribution plate 46-1, the flow velocity resistance to the exhaust flow EG2 on the exhaust duct 46-2 side is reduced. The heat exchange efficiency between the exhaust flow EG2 and the heat exchange tube 48-12 can be increased.

  (4) Since the exhaust flow EG1 obtained by subtracting the exhaust flow EG2 diverted from the combustion exhaust EG to the lower side of the exhaust distribution plate 46-1 flows to the hot water supply secondary heat exchanger 44-2, the exhaust distribution plate 46-1. Can prevent partial boiling on the side of the hot water supply secondary heat exchanger 44-2 due to the combustion exhaust gas EG flowing before the installation.

  (5) By providing the exhaust gas distribution plate 46-1 and the exhaust duct 46-2, the housing 30 can be made compact and the robustness of the housing 30 can be enhanced.

<Second embodiment>

  FIG. 10 shows a heat source device 18 according to the second embodiment. In this heat source unit, the same parts as those of the heat source unit 18 of the second embodiment and the secondary heat exchange unit 2 of the first embodiment are denoted by the same reference numerals.

  The heat source device 18 includes a burner 22, a primary heat exchanger 24, and an air supply fan 28 in a housing 66 of the combustion chamber 20. A plurality of heat exchange tubes 26 are installed in the primary heat exchanger 24, and each heat exchange tube 26 is provided with a plurality of common heat absorbing fins 68. The heat of the combustion exhaust EG is absorbed by each heat exchange tube 26, and the heat absorbed by the heat absorbing fins 68 is transmitted to each heat exchange tube 26. Each of the heat absorbing fins 68 has a heat conducting function for equalizing the heating state of each of the heat exchange tubes 26.

  The secondary heat exchange unit 2 is installed on the upper part of the housing 66, and a seat frame 70 is provided between the secondary heat exchange unit 2 and the housing 66. The seat frame 70 has a function of adjusting the height of the secondary heat exchange unit 2. In this embodiment, the drainage reservoir 60 side of the housing 66 of the secondary heat exchange unit 2 is lowered, and the exhaust inlet 38 is provided. The side is set high. As a result, the drain generated by the heat exchange flows toward the drain reservoir 60 and accumulates.

<Effect of Second Embodiment>

  According to the heat source unit 18, the effect of the secondary heat exchange unit 2 described above can be obtained, and the heat source unit 18 can be reduced in size and robustness.

<Third embodiment>

  FIG. 11 shows a piping system of a water heater according to the third embodiment. 11, the same parts as those in FIG. 1 are denoted by the same reference numerals.

  The hot water supply device 72 includes the heat source device 18 (FIG. 10) and has a hot water supply function, a heating function, and a bathtub water reheating function. The hot water supply device 72 uses a so-called three-water type heat source unit 18 for heat exchange between the heating water M and the combustion exhaust gas EG, uses the heating water M as a heat medium, and exchanges heat with the feed water W to generate hot water HW. Hot water supply, heating water M, and heat exchange between the bath water BW and the bath water BW, and a reheating function are realized.

  The hatched portion attached to the circulation circuit 74 for the heating water M is a circulation path for circulating the heat medium when performing continuous combustion for a predetermined time for gas consumption. When the burner 22 burns, the circulation path of the circulating heat medium HM is lengthened, so that the capacity of the heating water M is large and the combustion continuation time until boiling by heat exchange of the combustion heat is extended. A heating water tank 76 is provided in the circulation circuit 74, and the heating water M is stored in the heating water tank 76.

  A water supply passage 80 is connected to the water supply port 78, and a water supply W such as tap water is supplied. With this water supply W, hot water HW can be discharged from the tap hole 82. The water supply channel 80 and the reheating circuit 84 are connected by a pouring line 86. During pouring of the bathtub, hot water HW flows from the water supply line 80 to the reheating circuit 84 from the pouring line 86 and flows into the bathtub 88. It is poured. This pouring is a mode of hot water supply because it is water supply of water W which is an example of clean water similarly to hot water supply.

  A low-temperature terminal 92-1 or a high-temperature terminal 92-2 that radiates heat of the heat medium HM is connected to the branch pipes 90-1, 90-2, and 90-3 of the circulation circuit 74, as an example of the heating and radiating terminal 92. ing.

  The heat source unit 18 is provided with a primary heat exchanger 24, a heating secondary heat exchanger 44-1 and a hot water supply secondary heat exchange 44-2 on the secondary heat exchange unit 2 side. Since these details are as described above, the description is omitted.

  The circulation circuit 74 includes a primary heat exchanger 24, a heating secondary heat exchanger 44-1, a hot water supply heat exchanger 94-1 and a bath tub water heat exchanger 94-2. The heating water M heat-exchanged in the heating secondary heat exchanger 44-1 is heat-exchanged with the combustion exhaust EG by the primary heat exchanger 24. The hot water supply heat exchanger 94-1 is, for example, a plate heat exchanger. The hot water supply W that has been preheated by the hot water supply secondary heat exchanger 44-2 of the secondary heat exchange unit 2 and the heating water M as a heat medium are used. Heat exchange. Hot water supply heat exchanger 94-2 is, for example, a plate heat exchanger, and performs heat exchange between bathtub water BW and heating water M as a heat medium.

  In this embodiment, remote control device 96 includes, for example, bathroom remote control 96-1 and kitchen remote control 96-2.

<Effect of Third Embodiment>

  (1) According to the hot water supply device 72, the same effects as those of the above-described secondary heat exchange unit 2 and the heat source device 18 can be obtained, and the hot water supply device 72 can be downsized.

  (2) Partial boiling can be prevented during hot water supply, bath water reheating and heating water heating, and highly reliable hot water supply, heating and reheating operations can be obtained.

[Other embodiments]

  a) In the second embodiment and the third embodiment, a single primary heat exchanger 24 is provided and used for heating the heating water. May be realized by primary heating.

  b) The circulation circuit 74 may include another liquid-liquid heat exchanger, and may use the heat of the heating water M as a heat source for performing heat exchange with another medium to be heated, in addition to hot water supply.

As described above, the most preferred embodiments of the present invention have been described. The present invention is not limited to the above description. Various modifications and changes can be made by those skilled in the art based on the gist of the invention described in the claims or disclosed in the specification. It goes without saying that such modifications and changes are included in the scope of the present invention.

  The present invention provides an exhaust branching member in a housing including a plurality of heat exchange tubes for exchanging heat between a combustion exhaust and a fluid to be heated. Since the heat exchange between the combustion exhaust gas and the combustion exhaust gas is performed, the heat exchange can be performed by dispersing the combustion exhaust gas, the heat recovery of the combustion exhaust gas is improved, and the heat exchange efficiency is enhanced, which is useful.

2 Secondary heat exchange unit 4 Housing 4-1 Ceiling plate 4-2 Step 4-3 Bottom plate 6 Exhaust introduction unit 8 Exhaust unit 10-1 First heat exchange unit 10-2 Second heat exchange unit 12- DESCRIPTION OF SYMBOLS 1 1st heat exchange tube 12-11, 12-12, 12-21, 12-22 Heat exchange tube 12-2 2nd heat exchange tube 14 Drain reservoir 16 Exhaust distribution member 16-1 Distribution part 16-2 Duct Unit 18 Heat source device 20 Combustion chamber 22 Burner 24 Primary heat exchanger 26 Heat exchange tube 28 Air supply fan 30 Housing 32 Ceiling plate 34 Exhaust port 36 Overhanging part 38 Exhaust inlet 40 Circulating upright wall part 42 Exhaust guide part 43 Space part 44-1 Heating secondary heat exchanger 44-2 Hot water supply secondary heat exchanger 46-1 Exhaust air distribution plate 46-2 Exhaust duct 48-1, 48-11, 48-12 Heating secondary heat exchange pipe 48-2 Hot water supply Secondary heat exchange tube 50R, 50L Header section 52 Front wall section 54 Insertion section 56 Leg section 58 Tube section 60 Drain reservoir 62 Side wall section 64 Support section 66 Housing 68 Heat absorbing fins 70 Seating frame section 72 Hot water supply device 72
74 Circulation circuit 76 Heating water tank 78 Water supply port 80 Water supply path 82 Hot water outlet 84 Reheating circuit 86 Pouring pipe line 88 Bathtub 90-1, 90-2, 90-3 Branch pipe 92 Heating / radiating terminal 92-1 Low temperature terminal 92-2 High temperature terminal 94-1 Hot water supply heat exchanger 94-2 Bath tub water heat exchanger 96 Remote control device 96-1 Bathroom remote control 96-2 Kitchen remote control

Claims (5)

A housing for flowing combustion exhaust,
A first heat exchange section having a plurality of heat exchange pipes; and a second heat exchange section having a circulation system different from the first heat exchange section, and heats the combustion exhaust gas and the fluid to be heated in the housing. A heat exchange section in which a plurality of heat exchange tubes to be exchanged are arranged;
The heat exchange section is separated into at least two branch channels, the combustion exhaust flowing through the housing is split into a plurality of exhaust streams, and flows into each branch channel, and the heat exchange is performed for each exhaust stream flowing through each branch channel. A pipe and a branching section for exchanging heat between the combustion exhaust gas, and in one of the flow paths, the exhaust flow after the heat exchange in the branching section is subjected to heat exchange between the heat exchange pipe and the combustion exhaust gas and then to the outside air. And an exhaust diverting member comprising: a duct portion for flowing the exhaust flow after heat exchange in the diverting portion to the outside air in the other diverting channel;
The provided, comprising the diverter to the first heat exchanger, the heat exchanger, characterized in Rukoto with the duct portion to the second heat exchanger. The exhaust gas dividing member includes the detachable dividing portion and the duct portion, the dividing portion being arranged on the first heat exchange portion side, and the duct portion being arranged on the first heat exchange portion side. The heat exchanger according to claim 1, wherein the heat exchanger is connected to the branch part. A housing for flowing combustion exhaust,
A first heat exchange pipe that allows a first heated fluid to flow upstream of the combustion exhaust gas, and a second heated fluid that has a different circulation path from the first heated fluid downstream of the combustion exhaust gas A second heat exchange tube through which heat flows, and a heat exchange unit in which a plurality of heat exchange tubes for exchanging heat between the combustion exhaust and the fluid to be heated in the housing are arranged;
The heat exchange section is separated into at least two branch channels, the combustion exhaust flowing through the housing is split into a plurality of exhaust streams, and flows into each branch channel, and the heat exchange is performed for each exhaust stream flowing through each branch channel. A pipe and a branching section for exchanging heat between the combustion exhaust gas, and in one of the flow paths, the exhaust flow after the heat exchange in the branching section is subjected to heat exchange between the heat exchange pipe and the combustion exhaust gas and then to the outside air. And an exhaust diverting member comprising: a duct portion for flowing the exhaust flow after heat exchange in the diverting portion to the outside air in the other diverting channel ;
Heat exchanger you comprising: a. The exhaust gas diversion member includes the detachable diversion part and the duct part, the diversion part is arranged on the first heat exchange pipe side, and the duct part is arranged on the second heat exchange pipe side. The heat exchanger according to claim 3 , wherein the heat exchanger is connected to the branch part.   A heat source device comprising the heat exchanger according to claim 1, heating a fluid to be heated, and supplying or heating water using the fluid to be heated.

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