JP2017044437A - Heat exchanger and heat source machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase a heat recovery rate of combustion exhaust by enhancing heat exchange efficiency of the combustion exhaust.SOLUTION: A heat exchanger (secondary heat exchange unit 2) for using latent heat of fuel exhaust and the like for heat exchange includes: a casing (4) that makes combustion exhaust flow; a plurality of heat exchange tubes (first and second heat exchange tubes 12-1 and 12-2) for performing heat exchange of combustion exhaust and a heated fluid within the casing; and an exhaust diversion member (16) that diverts the combustion exhaust into a plurality of exhaust flows to make the heat exchange of the heat exchange tube and the combustion exhaust performed for each exhaust flow.SELECTED DRAWING: Figure 1

Description

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

  The hot water supply device is provided with a heat exchanger for exchanging heat of the combustion exhaust gas of the fuel gas. The heat exchanger includes a primary heat exchanger that exchanges sensible heat of the combustion exhaust and a secondary heat exchanger that exchanges latent heat of the combustion exhaust after heat exchange by the primary heat exchanger. Since the secondary heat exchanger recovers latent heat from the combustion exhaust, there are advantages such as improving the heat exchange efficiency and reducing the temperature of the combustion exhaust discharged to the outside air.

  In the secondary heat exchanger, preheating the water before heat exchange in the primary heat exchanger with the latent heat of the combustion exhaust, or preheating the heat medium used as a heat source with the latent heat of the combustion exhaust before the primary heat exchange, etc. There are usage forms.

With respect to improving the heat efficiency of such heat exchange, a configuration is known in which a ceiling wall of a passage space through which combustion exhaust flows is provided with a convex wall that disturbs the flow of combustion exhaust (for example, Patent Document 1). Furthermore, in a heat exchanger provided with a plurality of heat exchange tubes, one in which the heat exchange tubes are partitioned by a rectifying plate and the drain discharge side is inclined downward is known (for example, Patent Document 2).

JP 2014-70800 A JP 2014-119225 A

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

  However, because the flow of combustion exhaust flows to the low flow resistance side of the casing ceiling where the heat exchange tubes are not dense, a high-temperature exhaust flow flows downstream, and the exhaust temperature distribution becomes non-uniform There are challenges. There is a tendency that the amount of exhaust heat becomes higher at the upper part of the exhaust flow through the exhaust passage. If the exhaust flow passing through the exhaust passage becomes non-uniform, the heat exchange between the heat exchange pipes varies, and even a single heat exchange pipe has a heat exchange having a deviation in temperature distribution within the width. As a result, there is a problem that the heat exchange varies and the expected heat exchange efficiency cannot be obtained.

  If a high-temperature exhaust flow flows downstream and a heat exchange pipe used for heating such as feed water is provided on the downstream side, when heated, the fluid to be heated such as feed water is overheated, causing partial boiling. is there.

  If such an exhaust flow is left unattended, there is a problem that the heat exchange efficiency by the secondary heat exchanger is low, the heat recovery from the combustion exhaust is insufficient, and the exhaust temperature cannot be lowered.

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

  In order to achieve the above object, according to one aspect of the heat exchanger of the present invention, a casing for flowing combustion exhaust, and a plurality of heat exchange tubes for exchanging heat between the combustion exhaust and the fluid to be heated in the casing, The combustion exhaust gas may be divided into a plurality of exhaust streams, and the heat exchange pipe and an exhaust gas distribution member that performs heat exchange of the combustion exhaust gas may be provided for each exhaust stream.

  In the heat exchanger, the exhaust gas diversion member diverts the combustion exhaust gas flowing through the housing into at least two systems of exhaust gas flows, and performs heat exchange between the heat exchange pipe and the combustion exhaust gas for each exhaust gas flow. And a duct portion for flowing the exhaust flow after heat exchange in the diversion portion to the outside air.

  In the heat exchanger, the first heat exchanging unit includes a first heat exchanging unit having a plurality of heat exchanging tubes, and a second heat exchanging unit having a circulation system different from the first heat exchanging unit, The diversion unit may be provided, and the duct unit may be provided in the second heat exchange unit.

  In the heat exchanger, the heat exchanging unit includes a first heat exchange pipe that allows a first heated fluid to flow upstream of the combustion exhaust, and a first heated target downstream of the combustion exhaust. You may provide the 2nd heat exchange pipe | tube which lets the 2nd to-be-heated fluid from which a fluid and a circulation path differ flow.

  In the heat exchanger, the exhaust gas diversion member includes the detachable diversion portion and the duct portion, the diversion portion is disposed on the first heat exchange pipe side, and the duct portion is the second heat exchange pipe. It may be arranged on the heat exchange pipe side and connected to the flow dividing section.

In order to achieve the above object, according to one aspect of the heat source apparatus of the present invention, the fluid to be heated is provided with the heat exchanger, and at least hot water supply, bath 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 distribution member divides the combustion exhaust in the housing into a plurality of exhaust flows, and this split flow can make the exhaust flow uniform, and heat exchange between the combustion exhaust and the heated fluid for each exhaust flow can be achieved. It can be carried out.

  (2) By providing an exhaust gas diversion member in a housing having a plurality of heat exchange tubes for exchanging heat between the combustion exhaust and the fluid to be heated, the combustion exhaust is divided into a plurality of exhaust flows, and the heat exchange tubes for each exhaust flow. Since the heat exchange of 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 improved.

(3) It is possible to prevent the exhaust flow 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 which shows the secondary heat exchange unit which concerns on the 1st Embodiment of this invention. It is a figure which shows the secondary heat exchange unit which concerns on the 2nd Embodiment of this invention. It is a figure which shows the secondary heat exchange unit which concerns on the 3rd Embodiment of this invention. It is a figure which shows the heat-source equipment which concerns on the 4th Embodiment of this invention. It is sectional drawing which shows the heat exchanger which concerns on the 1st Example of this invention. It is a perspective view which shows a 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 gas distribution plate, and an exhaust duct. It is a perspective view which shows a part of exhaust flow distribution plate of a secondary heat exchange unit. It is a perspective view which shows the modification of the connection part of an exhaust gas distribution plate. It is a figure which shows the heat-source equipment which concerns on the 2nd Example of this invention. It is a figure which shows the hot water supply apparatus which concerns on the 3rd Example of this 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 according to 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 that forms an exhaust space for the combustion exhaust EG. The bottom surface of the casing 4 is provided with an exhaust introduction section 6, and the combustion exhaust EG guided from the exhaust introduction section 6 into the casing 4 flows through the casing 4 to the discharge section 8 and is released to the outside air. Is done.

  A first heat exchange unit 10-1 is provided on the upstream side of the combustion exhaust 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 heat exchange units. The heat exchange unit 10-1 includes a plurality of second heat exchange tubes 12-11 and 12-12, and the heat exchange unit 10-2 includes a plurality of first heat exchange tubes 12-2. In the heat exchange pipes 12-11 and 12-12, the first heated fluid is allowed to flow, and the heated fluid M and the combustion exhaust EG are subjected to heat exchange. A second heated fluid is passed through the heat exchange unit 10-2 to exchange heat between the heated fluid and the combustion exhaust EG. If the heat exchanging unit 10-1 is, for example, a heating heat exchanger, the fluid to be heated is, for example, 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.

  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 flow diverting member 16 is arranged, and a plurality of independent diversion channels are formed in the housing 4 for the exhaust flow. In this example, a first diversion channel is formed above the exhaust diversion member 16; A second diversion channel is formed below the exhaust diversion 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, the exhaust gas flow EG1 is a shunt path on the upper side of the exhaust gas distribution member 16, and the exhaust gas flow EG2 is on the lower side of the exhaust gas distribution member 16 It flows in the diversion channel.

  As an example, the exhaust diversion member 16 includes a diversion part 16-1 on the heat exchange part 10-1 side and a duct part 16-2 on the heat exchange part 10-2 side. The diversion unit 16-1 separates the heat exchange pipe 12-1 into the heat exchange pipe 12-11 and the heat exchange pipe 12-12, and also divides the combustion exhaust EG into the exhaust flow EG1 and the exhaust flow EG2, and the exhaust flow EG1. In this configuration, heat exchange with the heated fluid is performed for each EG2. In this example, since there are 14 heat exchange tubes 12-1, the heat exchange tubes 12-11 are 11 heat exchange tubes that are a part of all 14 tubes, and the heat exchange tubes 12-12 are Although it is three heat exchange pipes which are a part in all 14 pieces, it is not limited to this.

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

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

  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 side, and is inclined downward toward the discharge unit 8 side. Similarly, the face plate 4-3 is inclined downward toward the discharge portion 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 formed or installed at the terminal side of the bottom plate 4-3. .

<Effect of the first embodiment>

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

  (1) Since a plurality of flow channels are formed in the exhaust space of the casing 4 by the exhaust flow dividing member 16, the combustion exhaust EG is divided into a plurality of exhaust flows EG1, EG2 and rectified, and heat exchange can be performed for each exhaust flow. In addition, uneven temperature distribution of combustion exhaust gas and variations in heat exchange efficiency can be prevented, and heat exchange efficiency can be improved.

  (2) The combustion exhaust EG guided from the exhaust introduction part 6 to the housing 4 can be divided into at least two systems by the exhaust diversion member 16 and can flow out from the discharge part 8 to the outside air. The upper part of the exhaust space tends to have a higher amount of exhaust heat.On the other hand, by dividing the combustion exhaust gas into a plurality of exhaust streams, the part with a small amount of heat only performs heat exchange with some heat exchange tubes. The other exhaust can be diffused as much as the exhaust is reduced by the passage shape and the diversion, and the heat exchange efficiency in other heat exchange pipes can be increased, and the heat exchange efficiency can be improved as a whole.

(3) The exhaust gas flow EG1 that is diverted to the upper side of the exhaust gas diverting member 16 with respect to the combustion exhaust gas EG on the heat exchanging portion 10-1 side is exhausted through the heat exchanging portion 10-2. The exhaust flow EG2 that has been branched to the lower side of the exhaust flow dividing member 16 flows out to the outside air through the duct portion 16-2 without intersecting the exhaust flow EG1. For this reason, the exhaust flow EG1 flowing through the heat exchange unit 10-2 can be reduced by the amount of the exhaust flow EG2 with respect to the combustion exhaust EG on the heat exchange unit 10-1 side. The exhaust gas EG1 on the heat exchange pipe 12-11 and heat exchange section 10-2 side of the heat exchange section 10-1
EG = EG1 + EG2 (1)
Because
EG1 = EG-EG2 (2)
It becomes. The flow rate of the exhaust flow EG1 can be reduced by the amount that the exhaust flow EG2 is divided. Thereby, the opening cross section of the heat exchange part 10-2 which flows the exhaust flow EG1 by the side of the heat exchange part 10-2 can be reduced, and a heat exchange rate can be raised with the size reduction of the secondary heat exchange unit 2. FIG.

  (4) The exhaust flow EG2 divided by the exhaust flow dividing member 16 can be reliably brought into contact with the heat exchange pipe 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 dividing the exhaust flow EG2 by the exhaust flow dividing member 14, the flow rate of the exhaust flow EG1 can be reduced, and the crossing rate between the heat exchange pipe 12-11 on the heat exchange section 10-1 side and the combustion exhaust EG1 is increased. And the heat exchange efficiency in the heat exchange part 10-1 can be improved.

  (6) By reducing the flow velocity of the exhaust flow EG1 that has passed through the heat exchanging section 10-1, the rate of intersection of the heat exchanging section 10-2 with the heat exchange pipe 12-2 increases, and the recovery rate of latent heat of the combustion exhaust EG1 is increased. Enhanced.

  (7) In the exhaust flow EG2 branched by the exhaust flow dividing member 16, the flow dividing portion 16-1 is inclined downward from the inlet side toward the heat exchanging portion 10-2, and the duct portion 16-2 is opened to the outside air. Therefore, the exhaust flow EG2 can be discharged to the outside air without reducing the flow velocity, and the exhaust resistance of the combustion exhaust EG is not increased.

  (8) Since the diversion part 16-1 protrudes toward the exhaust introduction part 6, the exhaust flow EG2 of the combustion exhaust EG guided into the housing 4 can be efficiently led to the lower side of the diversion part 16-1. The heat exchange rate can also be increased on the lower side of the flow dividing section 16-1.

  (9) The exhaust flow diverting 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 diverting member 16 expands in the downstream heat exchange section 10-2, and as a result of the decrease in fluid resistance, the entanglement of the combustion exhaust with respect to the heat exchange pipe 12-2 is promoted. Higher heat exchange effect 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 flow diverting member 16 is installed on the bottom plate 4-3 side of the casing 4, but as shown in FIG. -2 may be arranged parallel to the ceiling plate 4-1.

  Even with this configuration, the same effects as those of the first embodiment can be obtained.

[Third Embodiment]

  FIG. 3 shows a secondary heat exchange unit according to the third embodiment. In FIG. 3, the same parts as those in FIG.

  In the above embodiment, the exhaust flow dividing member 16 is installed in the vicinity of 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. Formed. On the other hand, as shown in FIG. 3, by arranging the exhaust gas diverting member 16 in the middle part of the housing 4, the heating secondary heat exchange pipe 12-1 is moved to the first secondary heat by the diverting part 16-1. The exchange pipe 12-11 and the second secondary heat exchange pipe 12-12 are bisected, and the duct 16-2 replaces the heat exchange pipe 12-2 with the first hot water supply secondary heat exchange pipe 12-21 and the second secondary heat exchange pipe 12-21. It is good also as a structure which bisects to the hot water supply secondary heat exchange pipe 12-22. It is good also as a structure which performs the independent heat exchange by each of the exhaust flow EG1 and EG2 which flow into the shunt flow path isolate | separated into two systems by the duct part 16-2 side. Also in this embodiment, a plurality of exhaust flow dividing members 16 are provided and separated 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 apparatus according to the fourth embodiment. This heat source unit 18 is an example of a can-three-water type heat source unit according to the first embodiment. In the heat source device 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 pipe 26 of the secondary heat exchange unit 10-1 is connected to the heat exchange pipe 26 of the primary heat exchanger 24, and the heating water M that has passed through the heat exchange pipe 12-1 flows therethrough. Let An air supply fan 28 for supplying combustion air to the burner 22 is provided below the combustion chamber 20.

  In this heat source unit 18, the combustion exhaust EG generated by burning the fuel gas G with 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. The When the combustion exhaust 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 in the heat exchange pipe 26 is performed. The combustion exhaust EG that has passed through the heat exchange pipe 26 flows into the housing 4 from the exhaust introduction part 6 of the secondary heat exchange unit 2, and secondary heat exchange is performed in the secondary heat exchange unit 2. Since the heat exchange in the secondary heat exchange unit 2 has already been described, it is omitted.

According to such a configuration, the effects of the secondary heat exchange unit described above can be obtained, the thermal efficiency of the heat source unit 18 can be increased, and the size reduction can be achieved.

<First embodiment>

  FIG. 5 shows a cross section of the secondary heat exchange unit 2 according to the first embodiment. About this secondary heat exchange unit 2, the same code | symbol is attached | subjected to FIG. 1 and an identical part.

  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 a protruding portion 36 that is inclined downward toward the exhaust port 34. The projecting portion 36 is formed on an inclined surface parallel to the bottom surface portion of the housing 30 by varying the height.

  An exhaust introduction port 38 is formed in the bottom surface portion of the housing 30, and a surrounding wall 40 is formed inside the housing 30 and an exhaust guide portion 42 is provided in the exhaust introduction port 38. The exhaust guide part 42 is a member for guiding the combustion exhaust EG entering the exhaust introduction port 38 to the space part 43 of the housing 30. Therefore, the exhaust introduction port 38, the circumferential standing wall portion 40, and the exhaust guide portion 42 are examples of the exhaust introduction portion 6.

  As an example of the heat exchange section, a heating secondary heat exchanger 44-1 is disposed upstream of the flow of the combustion exhaust EG, and a hot water supply secondary heat exchanger 44-2 is disposed downstream of the casing 30. Yes. 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 air distribution plate 46-1 is provided on the heating secondary heat exchanger 44-1 side, and an exhaust duct 46-2 is connected to the exhaust air distribution plate 46-1 to the hot water supply secondary heat exchanger 44-2 side. is set up. The exhaust flow dividing plate 46-1 and the exhaust duct 46-2 are an example of the exhaust flow dividing member 16, and are formed of a metal plate such as a stainless plate, for example. The exhaust flow dividing plate 46-1 and the exhaust duct 46-2 may be formed of a noncombustible material plate instead of the metal plate. The exhaust flow dividing 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 combustion The flow of the exhaust EG is divided into the exhaust 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 hot water supply secondary heat exchange pipe 48-2 side on the hot water supply secondary heat exchanger 44-2 side.

<Heating Secondary Heat Exchanger 44-1, Exhaust Flow Divider 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. Between the heating secondary heat exchange pipes 48-11 and 48-12, an exhaust distribution plate 46-1 is installed, and the exhaust distribution plate 46-1 is bent downward from the inclined surface portion 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 portion of FIG. The insertion part 54 and the leg part 56 in the front wall part 52 of the exhaust gas distribution plate 46-1 are inserted in the front part of the exhaust duct 46-2, the exhaust gas distribution plate 46-1 is connected, and the exhaust gas distribution plate 46- 1 lower exhaust flow EG2 is led to the exhaust duct 46-2.

  FIG. 7 shows the housing 30 in which the heating secondary heat exchanger 44-1, the exhaust flow dividing 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 that is connected to the exhaust distribution plate 46-1. The tube portion 58 forms a flat rectangular tube body with the bottom surface portion of the housing 30. The cylindrical portion 58 is opened to the drain reservoir 60 side of the housing 30. Each side wall portion 62 of the cylindrical portion 58 is formed with a support portion 64 that is parallel to the bottom surface of the housing 30, and each support portion 64 is fixed to the bottom surface of the housing 30 with a screw or the like.

  As shown in FIG. 8A, the side wall portion 62 of the cylinder portion 58 is extended and is in close contact with the side surface portion of the header 50L. As described above, the side wall portion 62 of the cylinder portion 58 is brought into close contact with the side surface portion of the header 50L, so that the connectivity between the exhaust flow dividing plate 46-1 and the exhaust duct 46-2 is improved, and the exhaust flow diverting plate 46-1 and the exhaust duct 46 are increased. -2 maintains the airtightness of the connecting portion.

  FIG. 8B is an enlarged view of the portion VIIIB in FIG. When this connection structure is viewed from the upper side of the header 50L, the end of the exhaust flow dividing plate 46-1 is surrounded by the exhaust duct 46-2. An exhaust introduction port 38 is opened below the heating secondary heat exchanger 44-1, and the combustion exhaust EG guided from the exhaust introduction port 38 flows into the heating secondary heat exchanger 44-1.

  As shown in FIG. 9, the exhaust flow dividing 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 side. In this case, in order to maintain the airtightness of the connecting portion of the exhaust duct 46-2, a close-contact wall portion for improving the close contact with the exhaust flow dividing plate 46-1 may be provided on the exhaust duct 46-2 side. .

<Effect of the 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 flow dividing plate 46-1, and the upper open cross section of the exhaust flow diverting plate 46-1 is the hot water supply In other words, the opening cross section on the hot water supply secondary heat exchanger 44-2 side is expanded from the opening cross section on the upper side of the exhaust flow dividing plate 46-1. As a result, the exhaust flow EG1 that is branched to the upper side of the exhaust flow dividing plate 46-1 has a flow velocity that is higher than that of the combustion exhaust EG that is the source flow and that of the space 43 on the heating secondary heat exchanger 44-1 side. The passage time on the side of the exhaust flow 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 the upper side and the lower side of the exhaust flow dividing plate 46-1, the upper open cross section of the exhaust diversion plate 46-1 is It can be narrowed from the hot water supply secondary heat exchanger 44-2 side, whereby the opening cross section on the hot water supply secondary heat exchanger 44-2 side is narrowed by the overhanging portion 36 of the ceiling plate 32. That is, the volume on the hot water supply secondary heat exchanger 44-2 side can be reduced, which contributes to making the secondary heat exchange unit 2 compact.

  (3) The exhaust flow EG2 that is diverted to the lower side of the exhaust flow dividing plate 46-1 is compared with the combustion exhaust EG that is the source flow, and compared with the space 43 side on the heating secondary heat exchanger 44-1 side. 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 flow dividing plate 46-1, the flow velocity resistance against 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 pipe 48-12 side can be increased.

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

  (5) By providing the exhaust flow dividing 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 reference numerals are given to 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 example.

  The heat source unit 18 includes a burner 22, a primary heat exchanger 24, and an air supply fan 28 in a casing 66 of the combustion chamber 20. The primary heat exchanger 24 is provided with a plurality of heat exchange tubes 26, and each heat exchange tube 26 is provided with a plurality of common heat absorption fins 68. The heat of the combustion exhaust EG is absorbed by each heat exchange pipe 26, and the heat absorbed by the heat absorption fins 68 is transmitted to each heat exchange pipe 26. Each heat absorption fin 68 has a heat conduction function for making the heating state of each heat exchange tube 26 uniform.

  The secondary heat exchange unit 2 is installed on the top of the housing 66, and a seating frame portion 70 is provided between the secondary heat exchange unit 2 and the housing 66. This seating frame portion 70 has a function of adjusting the height of the secondary heat exchange unit 2. In this embodiment, the drain reservoir 60 side of the casing 66 of the secondary heat exchange unit 2 is lowered and its exhaust introduction port 38. The side is set high. As a result, the drain generated by heat exchange flows and accumulates on the drain reservoir 60 side.

<Effect of the second embodiment>

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

<Third embodiment>

  FIG. 11 shows a piping system of a hot water supply apparatus according to the third embodiment. In FIG. 11, the same parts as those in FIG.

  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 replenishment function. This hot water supply device 72 uses a so-called one-can three-water type heat source unit 18, heat exchange between the heating water M and the combustion exhaust EG, heating water M as a heat medium, and hot water HW by heat exchange with the water supply W The hot water supply, the hot water M and the hot water supply of the bathtub water BW by the heat exchange with the bathtub water BW and the memorial function are realized.

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

  A water supply path 80 is connected to the water supply port 78 and water supply W such as clean water is supplied. With this water supply W, hot water HW can be discharged from the hot water outlet 82. The water supply path 80 and the supplementary circulation path 84 are connected by a pouring pipe line 86, and hot water HW flows from the water supply path 80 through the pouring pipe line 86 to the memorial circulation path 84 and flows into the bathtub 88 during bath pouring. It is poured. Since this pouring is water supply of water W, which is an example of clean water, like hot water supply, it is an aspect of hot water supply.

  The branch pipes 90-1, 90-2, and 90-3 of the circulation circuit 74 are connected to a low temperature terminal 92-1 and a high temperature terminal 92-2 that radiate the heat of the heating medium HM as an example of the heating and radiation terminal 92. ing.

  The heat source unit 18 includes 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 bathtub water heat exchanger 94-2. Heating water M heat-exchanged in the heating secondary heat exchanger 44-1 is heat-exchanged with the combustion exhaust gas EG by the primary heat exchanger 24. The hot water supply heat exchanger 94-1 is, for example, a plate heat exchanger, and water supply W that has been preheated in the hot water supply secondary heat exchanger 44-2 of the secondary heat exchange unit 2 and heating water M as a heat medium, 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, the remote control device 96 includes, for example, a bathroom remote control 96-1 and a kitchen remote control 96-2.

<Effect of the third embodiment>

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

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

[Other Embodiments]

  a) In the second and third embodiments, a single primary heat exchanger 24 is provided and used for heating water. However, a plurality of primary heat exchangers 24 are used to provide heating water and bathtub water. It is good also as a structure which implement | achieves both by primary heating.

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

As described above, the most preferable embodiment of the present invention has 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.

  According to the present invention, an exhaust gas diverting member is provided in a housing having a plurality of heat exchange pipes for exchanging heat between combustion exhaust gas and a fluid to be heated, thereby dividing the combustion exhaust gas into a plurality of exhaust gas flows, and the heat exchange pipes for each exhaust gas flow. Therefore, the heat exchange of the combustion exhaust gas is performed, so that 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 improved, which is useful.

2 Secondary heat exchange unit 4 Case 4-1 Ceiling plate 4-2 Step 4-3 Bottom plate 6 Exhaust introduction part 8 Discharge part 10-1 First heat exchange part 10-2 Second heat exchange part 12- DESCRIPTION OF SYMBOLS 1 1st heat exchange pipe 12-11, 12-12, 12-21, 12-22 Heat exchange pipe 12-2 2nd heat exchange pipe 14 Drain reservoir 16 Exhaust flow diverting member 16-1 Diversion part 16-2 Duct Part 18 Heat source machine 20 Combustion chamber 22 Burner 24 Primary heat exchanger 26 Heat exchange pipe 28 Air supply fan 30 Housing 32 Ceiling plate 34 Exhaust port 36 Overhang part 38 Exhaust introduction port 40 Circumferential standing wall part 42 Exhaust guide part 43 Space part 42-1 Heating secondary heat exchanger 44-2 Hot water supply secondary heat exchanger 46-1 Exhaust flow dividing plate 46-2 Exhaust duct 48-1, 48-11, 48-12 Heating secondary heat exchange pipe 48-2 Hot water supply Secondary heat exchange pipe 50R, 50L Header portion 52 Front wall portion 54 Insertion portion 56 Leg portion 58 Tube portion 60 Drain reservoir 62 Side wall portion 64 Support portion 66 Housing 68 Heat absorption fin 70 Seating frame portion 72 Hot water supply device 72
74 Circulating circuit 76 Heating water tank 78 Water supply port 80 Water supply channel 82 Hot water outlet 84 Remembrance circulation channel 86 Pouring hot water channel 88 Bathtub 90-1, 90-2, 90-3 Branch pipe 92 Heating heat radiation terminal 92-1 Low temperature terminal 92-2 High temperature terminal 94-1 Hot water supply heat exchanger 94-2 Bathtub water heat exchanger 96 Remote control device 96-1 Bathroom remote control 96-2 Kitchen remote control

Claims (6)

A casing for flowing combustion exhaust;
A plurality of heat exchange tubes for exchanging heat between the combustion exhaust and the fluid to be heated in the housing;
An exhaust gas diversion member that diverts the combustion exhaust gas into a plurality of exhaust gas flows, and performs heat exchange between the heat exchange pipe and the combustion exhaust gas for each exhaust gas flow;
A heat exchanger comprising: The exhaust gas diverting member diverts the combustion exhaust gas flowing through the casing into at least two systems of exhaust gas flows, and a flow dividing unit that performs heat exchange between the heat exchange pipe and the combustion exhaust gas for each exhaust gas flow;
A duct portion for flowing the exhaust flow after heat exchange in the diversion portion to the outside air;
The heat exchanger according to claim 1, comprising: A first heat exchange section having a plurality of heat exchange tubes;
A second heat exchange part of a circulation system different from the first heat exchange part;
3. The heat exchanger according to claim 2, wherein the first heat exchange unit includes the flow dividing unit, and the second heat exchange unit includes the duct unit. The heat exchange part is
A first heat exchange pipe for flowing a first heated fluid upstream of the combustion exhaust;
A second heat exchange pipe for passing a second heated fluid having a circulation path different from that of the first heated fluid downstream of the combustion exhaust;
The heat exchanger according to any one of claims 1 to 3, further comprising:   The exhaust flow dividing member includes the detachable flow dividing portion and the duct portion, the flow dividing portion is disposed on the first heat exchange pipe side, and the duct portion is disposed on the second heat exchange pipe side. The heat exchanger according to any one of claims 1 to 4, wherein the heat exchanger is connected to the flow dividing section. A heat source apparatus comprising the heat exchanger according to claim 1 to heat a heated fluid, and performs hot water supply or heating using the heated fluid.

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