JP6480850B2 - Heat exchanger, secondary heat exchanger and heat source machine - Google Patents

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 that the heat exchange efficiency of the entire heat exchanger can be improved and the combustion exhaust discharged to the outside air can be cooled.

  For secondary heat exchangers, preheat the water before heat exchange in the primary heat exchanger with the latent heat of the combustion exhaust, or preheat the heat medium used as the 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, in the secondary heat exchanger, the combustion exhaust after the primary heat exchange is guided on the combustion chamber side, and the heat of this combustion exhaust is entangled in the secondary heat exchange pipe to perform heat exchange, thereby realizing efficient heat exchange Is assumed.

  However, since the combustion exhaust flows to the low-flow-path side of the casing ceiling side where the heat exchange pipes are not dense, there is a problem that the high-temperature exhaust flow flows downstream and the exhaust temperature distribution becomes uneven. is there. 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.

  When a high-temperature exhaust flow flows downstream and a heat exchange pipe used for heating water supply or the like is provided on the downstream side, the heated fluid such as residual water is overheated during non-water supply, causing partial boiling. There is also.

  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.

In view of the above problems, an object of the present invention is to increase 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 are disposed in the casing. A first heat exchange section for flowing a first heated fluid upstream of the combustion exhaust gas, and a second heat receiving section having a circulation path different from that of the first heated fluid downstream of the combustion exhaust gas. A heat exchanging part including a second heat exchanging part through which the heating fluid flows, and the combustion exhaust gas flowing to the second heat exchanging part from the second heat exchanging part to the first heat exchanging part side. A flow-changing piece that changes the direction of the heat-exhaust gas. The heat-exhaust gas flowed through the casing is collected or dispersed in the heat-exchange pipe to exchange heat between the heat-exchange pipe and the combustion exhaust gas. What is necessary is just to provide the 1 or 2 or more current transformation member to make.

  In the heat exchanger, the current changing member includes a collision member that collides the combustion exhaust to change a flow direction of the combustion exhaust, a flow direction changing member that changes the flow direction of the combustion exhaust in one direction, and the heat Any of the surrounding members surrounding a portion of the exchange tube or a combination thereof may be included.

In the heat exchanger, the current transformation member may change the direction of the combustion exhaust gas that has flowed to the second heat exchange section from the second heat exchange section to the first heat exchange section. With flakes,
And a second current changing piece for changing the direction of the combustion exhaust gas flowing to the first heat exchange section from the first heat exchange section to the second heat exchange section.

In order to achieve the above object, according to one aspect of the secondary heat exchanger of the present invention, a casing portion for flowing combustion exhaust after primary heat exchange, and the combustion exhaust and the fluid to be heated are heated in the casing portion. A plurality of heat exchange tubes to be exchanged are arranged, and a first heat exchange section that allows the first heated fluid to flow upstream of the combustion exhaust, and the first heated fluid downstream of the combustion exhaust And a second heat exchanging part that allows a second heated fluid having a different circulation path to flow therethrough, and the second heat exchanging part that converts the combustion exhaust gas flowing through the second heat exchanging part to the second heat exchanging part From the first heat exchanging portion to the first heat exchanging portion, and the combustion exhaust gas flowing through the housing portion is diverted to gather or disperse in the heat exchanging pipe, thereby exchanging the heat. You may provide a pipe | tube and the 1 or 2 or more current transformation member which performs the heat exchange of the said combustion exhaust gas.

  In the secondary heat exchanger, the above-described heat exchanger may be provided in the above-described casing portion.

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 or the secondary heat exchanger, and the heated fluid is used. Hot water supply or heating may be performed.

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

  (1) Combustion exhaust in the housing is gathered by a current transformation member or divided into multiple exhaust flows to make the exhaust flow uniform, and heat exchange between the combustion exhaust and the fluid to be heated for each exhaust flow Can be performed.

  (2) Since a current transformation member is provided 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 transformed and heat exchange between the heat exchange tube and the combustion exhaust is performed. The combustion exhaust can be made uniform to exchange heat, the heat recovery of the combustion exhaust becomes good, 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 downstream, and to avoid partial boiling of the heated fluid in the downstream heat exchange pipe.

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 modification of a secondary heat exchange unit. 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 secondary heat exchange unit which concerns on the 4th Embodiment of this invention. It is a figure which shows the secondary heat exchange unit which concerns on the 5th Embodiment of this invention. It is a figure which shows the secondary heat exchange unit which concerns on the 6th Embodiment of this invention. It is a figure which shows the secondary heat exchange unit which concerns on the 7th Embodiment of this invention. It is a figure which shows the heat-source equipment which concerns on the 8th Embodiment of this invention. It is sectional drawing which shows the heat exchanger which concerns on the 1st Example of this invention. It is sectional drawing which shows the heat source machine 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. 1A shows a secondary heat exchange unit according to the first embodiment. The configuration example shown in the figure is an example of the heat exchanger or the secondary heat exchanger of the present invention, and the present invention is not limited to such a configuration. The same applies to each embodiment below.

  For example, the secondary heat exchange unit 2 includes a cylindrical housing 4 as an exhaust space for the combustion exhaust EG after the primary heat exchange. The housing 4 is provided with an exhaust introduction portion 6 on the bottom surface side, and a discharge portion 8 on a side surface spaced from the exhaust introduction portion 6. The combustion exhaust EG introduced from the exhaust introduction part 6 passes through the housing 4 and is released from the exhaust part 8 to the outside air.

  For example, the housing 4 is provided with a single heat exchange unit 10, and a plurality of heat exchange tubes 12 included in the heat exchange unit 10 are arranged. These heat exchange pipes 12 constitute a continuous circulation path, and allow one system of heated fluid M to flow. This heated fluid M may be water supply W provided for hot water supply, or may be heating water hW provided for heating as an example of a heat medium.

  The inner wall of the housing 4 is provided with baffle plates 14-1, 14-2, 14-3 as an example of one or more current transformation members. The baffle plates 14-1 and 14-2 are disposed on the ceiling plate 16 of the housing 4, and the baffle plate 14-3 is disposed on the bottom plate 18. The baffle plates 14-1 and 14-2 are vertical plates suspended from the ceiling plate 16 toward the bottom plate 18, and the baffle plates 14-3 are vertical plates erected from the bottom plate 18 toward the ceiling plate 16. It is. The baffle plates 14-1 and 14-2 are arranged, for example, at equal intervals in the flow direction of the combustion exhaust EG, and the baffle plate 14-3 is arranged within the interval between the baffle plates 14-1 and 14-2. . If the height of the baffle plate 14-1 is h1, the height of the baffle plate 14-2 is h2, and the height of the baffle plate 14-3 is h3, these may be h1 = h2 = h3, and h1 ≠ h2 ≠. It may be h3, h1 <h2, or h1> h2. In this example, h1 and h2 are, for example, large enough to reach the tube diameter of the uppermost heat exchange tube 12, and h3 is large enough to reach the tube diameter of the lowermost heat exchange tube 12, for example. Yes.

  In such a secondary heat exchange unit 2, as shown in FIG. 1B, the combustion exhaust EG that has entered from the exhaust introduction portion 6 forms a laminar flow, and moves from the ceiling plate 16 side toward the bottom plate 18 side. For example, an exhaust flow EG1 can be defined on the upper layer side, an exhaust flow EG2 on the middle layer side, and an exhaust flow EG3 on the lower layer side. These laminar flows are affected by the flow velocity of the combustion exhaust EG, and when the flow velocity is high, the exhaust flow EG1 side is dominant.

  If the transitional laminar flow change is overviewed, the exhaust flow EG1 collides with the baffle plates 14-1 and 14-2 and reverses, and intersects the exhaust flow EG2 to change the laminar flow. That is, the exhaust flow EG1 and the exhaust flow EG2, and the exhaust flow EG1 and the exhaust flow EG3 are agitated. Further, the exhaust flow EG3 collides with the baffle plate 14-3 and reverses, and intersects the exhaust flows EG1 and EG2 to change the laminar flow. As a result, the exhaust flow EG3 and the exhaust flow EG2, and the exhaust flow EG3 and the exhaust flow EG1 are agitated.

  Due to such agitation, the exhaust flow EG1, EG2, EG3 of the combustion exhaust EG is entangled with elements such as the laminar flow direction and the laminar flow speed, and each laminar flow is disturbed. As a result, the combustion exhaust EG is biased in the laminar flow. However, the exhaust gas EG that has flowed into the housing 4 is used for heat exchange of the fluid M to be heated.

  The baffle plates 14-1, 14-2 and 14-3 for causing such laminar flow changes are a single straddle across the heat receiving portion width of the heat exchange pipe 12 (width in the direction crossing the combustion exhaust EG). Although it may be a plate, it may have a partial width within the width. For example, as shown in FIG. 2, the baffle plate 14-1 is divided within the width in parallel with the heat exchange pipe 12 straddling the headers 20-1 and 20-2, and the plurality of current-transforming pieces 14. -11, 14-12 may be used. This configuration is the same for the baffle plates 14-2 and 14-3. If a plurality of current transformation pieces such as each of the current transformation pieces 14-11 and 14-12 are provided, the positions of the current transformation pieces are different between the ceiling plate 16 and the bottom plate 18, and are alternately arranged, for example, in a staggered manner. It may be a form that causes a complicated change in the laminar flow of the combustion exhaust gas EG. Further, the baffle plates 14-1, 14-2, 14-3 may be configured to contact the heat exchange pipe 12 which is shaded to transfer the heat of the exhaust flow to the heat exchange pipe 12.

  If the heights h1 and h2 of the baffle plates 14-1 and 14-2 are set to h1 <h2, the exhaust flow EG1 that has passed through the baffle plate 14-1 collides with the baffle plate 14-2, and the laminar flow change is caused. Can be promoted.

<Effect of the first embodiment>

  (1) According to the secondary heat exchange unit 2 of the first embodiment, it can be used as a secondary heat exchanger such as a single hot water supply machine or a bath water heater.

  (2) The heat exchange pipe 12 of the heat exchange unit 10 can be used for heating the heated fluid M of one system.

  (3) For example, baffle plates 14-1, 14-2, 14-3 are provided as single or plural current transformation members provided in the exhaust path constituted by the casing 4, and the flow of the exhaust flows EG1, EG3 The path is changed in the vertical direction, and in particular, the exhaust flow flowing through the uppermost part and the lowermost part can be prevented from coming out to the discharge part 8 side without being subjected to heat exchange.

  (4) As a result of the laminar flow of the combustion exhaust EG flowing in the exhaust space of the casing 4 being disturbed, it is possible to prevent the combustion exhaust EG from slipping through and being biased, and the combustion exhaust EG flowing into the casing 4 All the heat exchange tubes 12 can be entangled and used for heat exchange, and the heat exchange efficiency can be improved.

  (5) The heat exchanging unit 10 is, for example, a unit composed of headers 20-1, 20-2 and a plurality of heat exchanging pipes 12, and this unit is a separate member from the casing 4, and the baffle plates 14-1, 14-2 , 14-3 can be configured as a member on the housing 4 side, so that the structure of the heat exchanging unit 10 can be prevented from being complicated, the manufacturing process can be separated, and an efficient manufacturing process of the secondary heat exchange unit 2 can be realized. .

[Second Embodiment]

  FIG. 3A shows a secondary heat exchange unit according to the second embodiment. In the secondary heat exchange unit 2 according to the second embodiment, for example, a plurality of baffle plates 24-1, 24-2, 24- 3 is provided. The baffle plates 14-1, 14-2, 14-3 of the first embodiment are vertical plates, whereas the baffle plates 24-1, 24-2, 24-3 are angled from upstream to downstream. It is an inclined plate inclined at θ1, θ2, and θ3. The baffle plates 24-1 and 24-2 are disposed on the ceiling plate 16 of the housing 4, and the baffle plate 24-3 is disposed on the bottom plate 18.

  The baffle plate 24-1 is an inclined plate having an inclination of the angle θ1 from the ceiling plate 16 toward the discharge portion 8, and the baffle plate 24-2 is also inclined at the angle θ2 from the ceiling plate 16 toward the discharge portion 8. The inclined plate and baffle plate 24-3 having a gradient are inclined plates having a gradient of an angle θ3 from the bottom plate 18 toward the discharge unit 8. The baffle plates 24-1 and 24-2 are arranged, for example, at equal intervals in the flow direction of the combustion exhaust EG, and the baffle plate 24-3 is arranged within the interval between the baffle plates 24-1 and 24-2. . The angles θ1, θ2, and θ3 may be θ1 = θ2 = θ3, θ1 ≠ θ2 ≠ θ3, θ1 <θ2, or θ1> θ2.

  The length of the baffle plate 24-1 is L1, its height is h1, the length of the baffle plate 24-2 is L2, its height is h2, the length of the baffle plate 24-3 is L3, and its height is h3 Then, these may be L1 = L2 = L3, L1 ≠ L2 ≠ L3, L1 <L2, or L1> L2. Similarly to the first embodiment, h1 = h2 = h3, h1 ≠ h2 ≠ h3, h1 <h2, or h1> h2. In this example, h1 and h2 are, for example, higher than the uppermost heat exchange pipe 12, and h3 is, for example, higher than the lowermost heat exchange pipe 12. θ1, θ2, and θ3 are, for example, 45 degrees.

  In such a secondary heat exchange unit 2, as shown in FIG. 3B, the combustion exhaust EG that has entered from the exhaust introduction portion 6 forms a laminar flow, and moves from the ceiling plate 16 side toward the bottom plate 18 side. The exhaust flows EG1, EG2, and EG3 are included. These laminar flows are affected by the flow velocity of the combustion exhaust EG, and the exhaust flow EG1 side is dominant as in the first embodiment.

  If an overview of the transient laminar flow change is given, the exhaust flow EG1 collides with the baffle plates 24-1 and 24-2 and reverses, crosses the exhaust flow EG2, changes the laminar flow, and the exhaust flow EG3. Has collided with the baffle plate 24-3 and reversed to change the laminar flow by crossing the exhaust flows EG1 and EG2. As a result, the exhaust flow EG3 and the exhaust flow EG2, and the exhaust flow EG3 and the exhaust flow EG1 are agitated.

  In this laminar flow diffusion, the baffle plates 24-1, 24-2, and 24-3 have gradients of angles θ1, θ2, and θ3, so that the resistance function to each laminar flow is relaxed and the direction of the laminar flow is changed gently. And stirring between laminar flows can be performed.

  As a result of such agitation, the exhaust flow EG1, EG2, EG3 of the combustion exhaust EG is entangled with elements such as the laminar flow direction and the laminar flow velocity, and each laminar flow is disturbed. The combustion exhaust gas EG that has spread widely to the heat exchange pipes 12 and has flowed into the housing 4 is used for heat exchange of the heated fluid M.

  Also in this embodiment, the baffle plates 24-1, 24-2, and 24-3 are configured as a single plate that spans the heat receiving portion width of the heat exchange pipe 12 (width in the direction intersecting with the combustion exhaust EG). In addition, the baffle plate 24-1 is divided in parallel with the heat exchange pipe 12 extending over the headers 20-1 and 20-2, for example, as shown in FIG. It may be a current piece. When a plurality of current transformation pieces are provided, the positions of the current transformation pieces are different between the ceiling plate 16 and the bottom plate 18 and may be alternately arranged, for example, in a staggered manner, or the laminar flow of the combustion exhaust EG. Can cause complex changes.

  If the heights h1 and h2 of the baffle plates 24-1 and 24-2 are h1 <h2, the exhaust flow EG1 that has passed through the baffle plate 24-1 collides with the baffle plate 24-2, and the laminar flow change is caused. The same can be said for this embodiment.

<Effects of Second Embodiment>

  (1) According to the secondary heat exchange unit 2 according to the second embodiment, it can be used in a secondary heat exchanger such as a single hot water supply machine or a bath water heater.

  (2) In this embodiment as well, a system of heated fluid M is allowed to flow through the heat exchange pipe 12 and can be used for heat exchange of sensible heat and latent heat of the combustion exhaust EG.

  (3) Since the baffle plates 24-1, 24-2, and 24-3 of this embodiment are inclined from the upstream side to the downstream side of the combustion exhaust EG, the baffle plates 24-1, 24-2, and 24-3 are inclined with respect to the exhaust flows EG1, EG2, and EG3. Exhaust resistance can be lowered, and a reduction in exhaust efficiency can be prevented.

  (4) The heat exchange pipe 12 covered with the baffle plates 24-1, 24-2 and 24-3 can cause the baffle plates 24-1, 24-2 and 24-3 to function as heat transfer fins and receive heat. Efficiency can be increased.

  (5) By setting the angles θ1, θ2, and θ3 to the baffle plates 24-1, 24-2, and 24-3, a gentle reflected flow corresponding to the angles θ1, θ2, and θ3 is generated, and these laminar flows are By crossing the exhaust flow EG2, the laminar flow can be disturbed to prevent the combustion exhaust EG from slipping through and being biased.

  (6) The combustion exhaust EG flowing into the housing 4 can be entangled with all the heat exchange pipes 12 in the housing 4 for heat exchange, and the heat exchange efficiency can be improved.

[Third Embodiment]

  FIG. 4A is an example of a secondary heat exchange unit according to the third embodiment. In this secondary heat exchange unit 2, instead of the baffle plate of the first or second embodiment, a plurality of baffle plates 34-1 34-2, 34-3 and 34-4 are provided as current transformation members. The baffle plates 34-1, 34-2, 34-3, and 34-4 are arranged at regular intervals from the exhaust introduction part 6 of the housing 4 toward the discharge part 8, and the baffle plates 34-1 and 34-3 are arranged. Are arranged on the bottom plate 18 side, and the baffle plates 34-2 and 34-4 are arranged on the ceiling plate 16 side.

  The baffle plate 34-1 has a position in the height direction that is different on the bottom plate 18 side, and is covered with a pair of heat exchange pipes 12 that move back and forth toward the discharge portion 8, and has an angle θ1 with respect to the ceiling plate 16. It has an inclined surface.

  The baffle plate 34-2 is covered with a pair of heat exchange pipes 12 that are different from each other in the height direction on the ceiling plate 16 side on the discharge unit 8 side than the baffle plate 34-1 and back and forth toward the discharge unit 8. The bottom plate 18 is inclined with an angle θ2.

  The baffle plate 34-3 is covered with a pair of heat exchange tubes 12 that are different from each other in the height direction on the bottom plate 18 side on the discharge unit 8 side than the baffle plate 34-2 and back and forth toward the discharge unit 8. It forms an inclined surface with respect to the ceiling plate 16 at an angle θ3.

  The baffle plate 34-4 has a different position in the height direction on the ceiling plate 16 side on the discharge unit 8 side than the baffle plate 34-3, and is covered with a pair of heat exchange tubes 12 back and forth toward the discharge unit 8. The bottom plate 18 is inclined with an angle θ4.

  These angles θ1, θ2, θ3, and θ4 may be θ1 = θ2 = θ3 = θ4, or may be θ1 ≠ θ2 ≠ θ3 ≠ θ4.

  The width Lx of each baffle plate 34-1, 34-2, 34-3, 34-4 depends on the diameter and interval of the heat exchange pipe 12 to be attached. The width Lx may be different for each baffle plate 34-1, 34-2, 34-3, 34-4, or may be matched.

  If such baffle plates 34-1, 34-2, 34-3, and 34-4 are provided, the combustion exhaust gas EG converts the exhaust flows EG1, EG2, and EG3, as in the first or second embodiment. Thus, laminar flow changes can be brought about, and the heat exchange of the first or second embodiment can be performed.

  As shown in FIG. 4B, the exhaust flow EG1 collides with the baffle plates 34-1 and 34-2 and reverses, crosses the exhaust flow EG2, changes the laminar flow, and the exhaust flow EG3 interferes. As described above, the plate 34-3 collides with the plate 34-3, reverses, and crosses the exhaust flows EG1 and EG2 to change the laminar flow. As a result, the exhaust flow EG3 and the exhaust flow EG2, and the exhaust flow EG3 and the exhaust flow EG1 are agitated.

  In this laminar flow diffusion, the baffle plates 34-1, 34-2, 34-3, and 34-4 have gradients of angles θ1, θ2, θ3, and θ4. It is possible to gently change between the directions of the laminar flows.

  As a result of such agitation, the exhaust flow EG1, EG2, EG3 of the combustion exhaust EG is entangled with elements such as the laminar flow direction and the laminar flow velocity, and each laminar flow is disturbed. The combustion exhaust gas EG that has spread widely to the heat exchange pipes 12 and has flowed into the housing 4 is used for heat exchange of the heated fluid M.

  Also in this embodiment, the baffle plates 34-1, 34-2, 34-3, and 34-4 are single over the heat receiving portion width of the heat exchange pipe 12 (width in the direction crossing the combustion exhaust EG). In addition to the configuration of the plate, the baffle plate 34-1 is disposed within the width in parallel with the heat exchange pipe 12 extending over the headers 20-1 and 20-2, for example, as shown in FIG. It may be divided into a plurality of current-transforming pieces 14-11 and 14-12. When a plurality of current transformation pieces are provided, the positions of the current transformation pieces are different between the ceiling plate 16 and the bottom plate 18 and may be alternately arranged, for example, in a staggered manner, or the laminar flow of the combustion exhaust EG. Can cause complex changes.

  If the heights h1 and h2 of the baffle plates 34-1 and 34-2 are set to h1 <h2, the exhaust flow EG1 that has passed through the baffle plate 34-1 collides with the baffle plate 34-2, and the laminar flow change is caused. The same can be said for this embodiment.

<Effect of the third embodiment>

  (1) The secondary heat exchange unit 2 according to this embodiment can also be used in a secondary heat exchanger such as a single hot water supply machine or a bath water heater.

  (2) In this embodiment as well, as in the first or second embodiment, a single heated fluid M is caused to flow through the heat exchange pipe 12 to exchange heat of sensible heat or latent heat of the combustion exhaust EG. It can be performed.

  (3) The baffle plates 34-1, 34-2, 34-3, 34-4 are provided with a flat plate portion that bridges from the upstream side to the downstream side of the combustion exhaust EG, and the edges are curved to exchange heat. Attached to the tube 12. For this reason, the assembly of each baffle plate 34-1, 34-2, 34-3, 34-4 is easy.

  (4) In each baffle plate 34-1, 34-2, 34-3, 34-4, the flow path of the combustion exhaust EG of the exhaust flow can be changed through the bridge portion, and a plurality of heat exchange tubes Since it adheres to the surface of 12, it can be made to function as a heat-transfer fin, and heat exchange efficiency can be improved. That is, since the baffle plates 34-1, 34-2, 34-3, and 34-4 are in close contact with the heat exchange tube 12, the heat transfer is improved.

  (5) By setting the inclination angles θ1, θ2, and θ3, it is possible to generate a gentle reflected flow according to the angles θ1, θ2, and θ3, and to disrupt the laminar flow by crossing these laminar flows with the exhaust flow. Further, the exhaust gas EG can be prevented from slipping through and being biased, and the exhaust flow colliding with the inclined surface can be reflected and entangled with the laminar flow, and the combustion exhaust EG can be diffused according to the laminar flow velocity. This diffusion can improve the heat exchange efficiency.

  (6) The combustion exhaust EG flowing into the housing 4 can be entangled with all the heat exchange tubes 12 in the housing 4 to be used for heat exchange.

  (7) Since the baffle plates 34-1, 34-2, 34-3, 34-4 are attached to the heat exchange pipe 12, the baffle plates 34-1, 34-2, 34-3, 34- 4 can be supported by the heat exchange pipe 12, and the support strength of the baffle plates 34-1, 34-2, 34-3, 34-4 can be increased. The baffle plates 34-1, 34-2, 34-3, and 34-4 can be formed of, for example, a thin member having a small thickness, and the weight can be reduced.

  (8) The ratio of the baffle plates 34-1, 34-2, 34-3, 34-4 to the secondary heat exchange unit 2 can be reduced, and the volume occupation rate by the baffle plates can be reduced.

  (9) If the edge sides of the baffle plates 34-1, 34-2, 34-3, 34-4 are formed concentrically with the outer periphery of the heat exchange tube 12, the fluid resistance can be reduced.

[Fourth Embodiment]

  FIG. 5A shows a secondary heat exchange unit according to the fourth embodiment. In the first to third embodiments, there is only a single system heat exchanging section, whereas the casing 4 has a first system heat exchanging section 10-1 upstream of the combustion exhaust EG, and its downstream side. Is provided with a second system heat exchange section 10-2. A plurality of heat exchange pipes 12-1 that flow through the first heated fluid M1 through the heat exchange unit 10-1, and a plurality of heats through the second heated fluid M2 through the heat exchange unit 10-2. An exchange tube 12-2 is provided.

  In this embodiment, the ceiling plate 16 is provided with a single baffle plate 44-1, and this baffle plate 44-1 is installed in a suspended state between the heat exchange unit 10-1 and the heat exchange unit 10-2. ing.

  According to such a configuration, as shown in B of FIG. 5, the baffle plate 44-1 functions as a reflecting plate with respect to the exhaust flow EG1 side of the combustion exhaust EG. The exhaust flow EG1 colliding with the baffle plate 44-1 rebounds at the baffle plate 44-1, collides with the exhaust flow EG2 or the exhaust flow EG3, and diffuses the combustion exhaust EG.

<Effect of the fourth embodiment>

  (1) According to the secondary heat exchange unit 2 of the fourth embodiment, the secondary heat exchange unit 2 can be used for a secondary heat exchanger such as a single-can three-water type heating water heater.

  (2) For example, heating medium M1 for heating and radiating heat is circulated in the heat exchange pipe 12-1 of the heat exchange unit 10-1, and water supply W is provided in the heat exchange pipe 12-2 of the heat exchange unit 10-2. Can be circulated and used for preheating hot water.

  (3) By providing the baffle plate 44-1 between the heat exchanging unit 10-1 and the heat exchanging unit 10-2, the exhaust flow EG1 of the combustion exhaust EG is collided mainly, and this exhaust flow EG1 is used as the exhaust flow EG2. Alternatively, the exhaust gas EG3 can be pushed down and intersected to promote the diffusion of the combustion exhaust gas EG.

  (4) Due to the diffusion of the combustion exhaust EG, the combustion exhaust EG hits the entire heat exchange pipe 12-1 of the heat exchange unit 10-1 on the upstream side, and the heat exchange of the combustion exhaust EG in the entire heat exchange unit 10-1. It can be performed. Since this heat exchange can be performed regardless of the displacement of the combustion exhaust EG, the heat exchange efficiency can be improved.

  (5) Since the combustion exhaust EG is diffused and hits the heat exchange pipe 12-2 of the heat exchange unit 10-2 on the downstream side, the heat exchange efficiency can be increased also in the heat exchange unit 10-2.

  (6) The bias of the high-temperature combustion exhaust EG can be prevented with respect to the heat exchange pipe 12-2 of the heat exchange section 10-2 on the downstream side, and the heat exchange pipe 12-2 on the upstream side of the heat exchange section 10-2 It is possible to prevent partial boiling of the heated fluid circulating in the tank.

[Fifth Embodiment]

  FIG. 6A shows a secondary heat exchange unit according to the fifth embodiment. In this secondary heat exchange unit 2, in addition to the baffle plate 44-1 in the secondary heat exchange unit 2 according to the fourth embodiment, the baffle plates 44-2, 44-3 on the heat exchange unit 10-2 side. Is provided.

  The baffle plate 44-2 is erected on the bottom plate 18 side of the housing 4, and the baffle plate 44-3 is erected on the ceiling plate 16 side of the housing 4. In this example, the baffle plate 44-2 is disposed at an intermediate position between the baffle plates 44-1 and 44-3.

  In such a configuration, as shown in FIG. 6B, the exhaust flow EG1 of the combustion exhaust EG mainly collides with the baffle plate 44-1, and the flow path is changed. The exhaust flow EG3 of the combustion exhaust EG mainly collides with the baffle plate 44-2, and the flow path is changed. The exhaust flow EG1 of the combustion exhaust EG mainly collides with the baffle plate 44-3, and the flow path is changed. It is the same as in the fourth embodiment that the exhaust flow EG1 is entangled with the heat exchange pipe 12-1 of the heat exchange unit 10-1 by such a change in the flow path. The exhaust flows EG2 and EG3 are entangled with the heat exchange pipe 12-2 of the heat exchange unit 10-2. Further, the exhaust flows EG1, EG2, and EG3 whose flow paths are changed are diffused and entangled with the heat exchange tubes 12-1 and 12-2, thereby contributing to heat exchange with the heated fluid.

<Effect of Fifth Embodiment>

  (1) According to the heat exchange unit 2 of the fifth embodiment, as in the fourth embodiment, the heat exchange unit 2 can be used for a secondary heat exchanger such as a single-can three-water heating water heater. .

  (2) In the heat exchanging unit 10-1, the effect of changing the flow path of the exhaust flow EG1 by the baffle plate 44-1 is obtained as in the fourth embodiment, and further, in the heat exchanging unit 10-2, the combustion exhaust EG Can be prevented, and the heat exchange efficiency can be improved.

[Sixth Embodiment]

  FIG. 7A shows a secondary heat exchange unit according to the sixth embodiment. In the secondary heat exchange unit 2, a baffle plate 54-1 is provided at the same position as the baffle plate 44-1 of the secondary heat exchange unit 2 of the fourth embodiment. The baffle plate 44-1 is a vertical plate that hangs down from the ceiling plate 16 toward the bottom plate 18, whereas the baffle plate 54-1 hangs down from the ceiling plate 16 toward the bottom plate 18, and the combustion exhaust EG A circular arc plate having a surface curved in a direction opposite to the flow direction is used.

  If such a baffle plate 54-1 is provided, as shown in FIG. 7B, the exhaust flow EG1 that has collided with the baffle plate 54-1 has its flow path bent along its curved surface, and a vertical plate. Compared to the above, the stagnation or vortex of the exhaust flow EG1 can be generated, and the diffusion mainly due to the intersection with the exhaust flow EG2 can be promoted.

<Effect of the sixth embodiment>

  (1) According to the heat exchange unit 2 of the sixth embodiment, as in the fifth embodiment, the heat exchange unit 2 is used for a secondary heat exchanger such as a single-can three-water type heating water heater. The effect is obtained.

  (2) Since the baffle plate 54-1 has a curved surface, the colliding exhaust flow EG1 is bent along the curved surface, and the heat exchange of the heat exchanging unit 10-1 does not pass through the exhaust flow EG1. The tube 12-1, that is, the heat exchange tube 12-1 on the ceiling plate 16 side and the bottom plate 18 side is entangled without distinction and contributes to heat exchange of the fluid to be heated.

  (4) The heat exchange between the high-temperature exhaust gas of the combustion exhaust EG and the heat exchange unit 10-1 can be promoted, and the combustion exhaust EG after the heat exchange is diffused and the heat exchange pipe 12-2 of the downstream heat exchange unit 10-2 Can be entangled with.

  (5) Since the combustion exhaust EG that has undergone heat exchange with the heat exchange pipe 12-1 of the heat exchange unit 10-1 can flow to the heat exchange unit 10-2 on the downstream side, upstream of the heat exchange unit 10-2 It is possible to prevent partial boiling of the heated fluid circulating in the heat exchange pipe 12-2 on the side.

[Seventh Embodiment]

  FIG. 8A shows a secondary heat exchange unit according to the seventh embodiment. In this secondary heat exchange unit 2, in addition to the baffle plate 54-1 in the secondary heat exchange unit 2 according to the sixth embodiment shown in FIG. 7A, on the inlet side of the heat exchange unit 10-1. A baffle plate 54-2 is provided.

  The baffle plate 54-2 is a circular arc plate having a curved surface like the baffle plate 54-1, and the curved direction faces the baffle plate 54-1. That is, a convex curved surface is provided on the back side of the baffle plate 54-2, and this curved surface is opposed to the exhaust introduction part 6.

  Thus, if the baffle plate 54-2 is provided on the exhaust introduction part 6 side, as shown in FIG. 8B, the exhaust flow EG2, EG3 of the combustion exhaust EG mainly hits the curved surface of the baffle plate 54-2, The flow path is changed. The exhaust flows EG2 and EG3 accompanied by the flow path change reach the baffle plate 54-1 from the ceiling plate 16 and the back surface on the exhaust introduction portion 6 side. As a result, the exhaust flows EG2 and EG3 are diffused with the exhaust flow EG1, and are entangled with the heat exchange pipe 12-1 of the heat exchange unit 10-1, so that the combustion exhaust EG after the heat exchange is diffused and the heat exchange unit It flows to 10-2.

<Effect of the seventh embodiment>

  (1) According to the secondary heat exchange unit 2 according to the seventh embodiment, a secondary heat exchanger such as a single can three-water type heating water heater as in the secondary heat exchange unit of the above embodiment. Can be used as

  (2) By providing both the baffle plates 54-1 and 54-2, the combustion exhaust EG introduced from the combustion chamber is used as the heat exchange pipe 12-1 of the heat exchange unit 10-1 on the exhaust introduction unit 6 side. And the agitation, and sufficient heat exchange is performed on the heat exchange unit 10-1 side, and the combustion exhaust after the heat exchange can be guided to the heat exchange unit 10-2 side.

[Eighth Embodiment]

  FIG. 9 shows a heat source machine according to the eighth embodiment. The heat source unit 60 is an example of a can-and-water type heat source unit. In the heat source device 60, the secondary heat exchange unit 2 (FIG. 1) according to the first embodiment is installed on the upper side of the casing 62 on the primary heat exchanger side.

  The casing 62 is provided with a combustion chamber 64, and the combustion chamber 64 is provided with a burner 66 and a primary heat exchanger 68. An air supply fan 70 is installed below the burner 66, and combustion air is supplied to the burner 66 from below the combustion chamber 64.

  The heat exchange pipe 12 of the secondary heat exchange unit 10 is connected to the heat exchange pipe 72 of the primary heat exchanger 68. A fluid to be heated, such as heating water M, preheated by the latent heat of the combustion exhaust gas EG in the heat exchange pipe 12 flows.

  According to such a configuration, the combustion exhaust EG generated in the burner 66 by the combustion of the fuel gas G passes through the primary heat exchanger 68 by the supply of the supply fan 70, and then passes through the exhaust introduction unit 6 from the combustion chamber 64. It is introduced into the secondary heat exchange unit 2 through.

  The heat exchange pipe 72 of the primary heat exchanger 68 receives the upstream combustion exhaust EG, and performs primary heat exchange between the sensible heat of the combustion exhaust EG and the fluid to be heated, for example, the heating water M. The combustion exhaust gas EG that has undergone the primary heat exchange flows into the secondary heat exchange unit 2, undergoes secondary heat exchange in the heat exchange unit 10, and is then discharged from the discharge unit 8 to the outside air.

  Since the flow path change and diffusion of the combustion exhaust EG in the secondary heat exchange unit 2 are described in detail in the first embodiment, the description thereof is omitted.

<Effect of the eighth embodiment>

  According to the heat source unit 60, the heat exchange efficiency between the combustion exhaust EG and the fluid to be heated can be increased, the thermal efficiency of the heat source unit 60 can be increased, and the size reduction can be achieved.

<First embodiment>

  FIG. 10A shows the secondary heat exchange unit according to the first embodiment. This secondary heat exchange unit 80 embodies the secondary heat exchange unit 2 (FIG. 7) according to the sixth embodiment.

  The secondary heat exchange unit 80 is provided with a unit case 82, a ceiling plate 84 is provided on the upper surface of the unit case 82, and a bottom plate 86 parallel to the ceiling plate 84 is provided. An exhaust space 88 is formed between the ceiling plate 84 and the bottom plate 86.

  An exhaust introduction portion 90 is opened in the bottom plate 86, and an exhaust guide 92 is formed above the exhaust introduction portion 90. The combustion exhaust EG hits the exhaust guide 92 and is guided to the exhaust space 88.

  In the exhaust space 88, a first heat exchange section 94-1 and a second heat exchange section 94-2 are arranged with the first heat exchange section 94-1 on the upstream side of the combustion exhaust EG. The ceiling plate 84 is provided with a bulging portion 96 that protrudes downward on the heat exchanging portion 94-2 side, and the bottom plate 86 forms an inclined surface that is inclined on the exhaust portion 98 side, and a drain reservoir on the exhaust portion 98 side. 100 is formed by a bottom plate 86.

  An assembly of heat exchange tubes 102-1 is disposed in the heat exchange unit 94-1, and an assembly of heat exchange tubes 102-2 is disposed in the heat exchange unit 94-2. A baffle plate 104 that separates the heat exchange unit 94-2 and the heat exchange unit 94-1 is provided toward the exhaust guide 92.

  According to such a configuration, as shown in FIG. 10B, the flow direction of the combustion exhaust EG introduced from the combustion chamber side into the exhaust introduction section 90 is changed by the exhaust guide 92, and the heat of the heat exchange section 94-1 is obtained. Passing through the exchange pipe 102-1, the exhaust flow EG1 mainly bounces off by the baffle plate 104, and is entangled with the heat exchange pipe 102-1 of the heat exchange section 94-1 again. Thereby, the combustion exhaust gas EG is retained and diffused, and heat exchange with the heated fluid flowing through the heat exchange pipe 102-1 is performed.

<Effect of the first embodiment>

  (1) The combustion exhaust EG after this heat exchange flows to the heat exchange section 94-2 side, and heat exchange is performed before heat exchange in the heat exchange pipe 102-1 by changing the flow path of the combustion exhaust EG by the baffle plate 104. Contact with the heat exchange pipe 102-2 on the upstream side of the section 94-2 is avoided.

  (2) Partial boiling of the fluid to be heated on the heat exchange pipe 102-2 side on the upstream side can be prevented.

<Second embodiment>

  FIG. 11 shows a heat source apparatus according to the second embodiment. In this heat source unit, the same parts as those of the heat source unit 60 of the eighth embodiment and the secondary heat exchange unit 80 of the first example are denoted by the same reference numerals, and description thereof is omitted.

  The primary heat exchanger 68 is provided with a plurality of heat exchange tubes 72, and each heat exchange tube 72 is provided with a plurality of common heat absorbing fins 106. Each heat exchange pipe 72 absorbs the heat of the combustion exhaust EG, and the heat absorbed by the heat absorption fins 106 is transmitted to each heat exchange pipe 72. Each heat absorption fin 106 has a heat conduction function for making the heating state of each heat exchange tube 72 uniform.

  A secondary heat exchange unit 80 is installed on the top of the housing 62, and a seating frame portion 108 is provided between the secondary heat exchange unit 80 and the housing 62. The seating frame portion 108 has a function of adjusting the height of the secondary heat exchange unit 80. In this embodiment, the drain reservoir 100 side of the casing 62 of the secondary heat exchange unit 80 is lowered, and the exhaust introduction portion 90. The side is set high. Thereby, the drain produced by heat exchange flows and accumulates on the drain reservoir 100 side.

<Effect of the second embodiment>

  According to the case 62, the effects of the secondary heat exchange unit 2 described above can be obtained, and the heat source device 60 can be made smaller and more robust.

<Third embodiment>

  FIG. 12 shows a hot water supply apparatus according to the third embodiment. In FIG. 12, the same parts as those of FIG.

  This hot water supply apparatus 200 includes a heat source device 60 (FIG. 11) and has a hot water supply function, a heating function, and a bathtub water replenishment function. This hot water supply device 200 uses the above-described one-can three-water type heat source unit 60, exchanges heat between the heating water M and the combustion exhaust EG, uses the heating water M as a heat medium, and exchanges heat with the supply water W. The hot water supply of the hot water HW, the water supply of the bathtub water BW by the heat exchange with the heating water M, and the bathtub water BW, and the memorial function are implement | achieved.

  A hatched portion attached to the circulation circuit 202 of the heating water M is a circulation path portion for circulating the heat medium when performing continuous combustion for a predetermined time for gas consumption. When the burner 66 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 202 is provided with a heating water tank 204, and the heating water M is stored in the heating water tank 204.

  A water supply path 208 is connected to the water supply port 206 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 210. The water supply path 208 and the supplemental circulation path 212 are connected by a pouring pipe line 214, and at the time of bath pouring, hot water HW flows from the water supply path 208 to the memorial circuit 212 and flows into the bathtub 216. 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 218-1, 218-2, and 218-3 of the circulation circuit 202 are connected to a low-temperature terminal 220-1 and a high-temperature terminal 220-2 that radiate the heat of the heating medium HM as an example of the heating and radiating terminal 220. ing.

  The heat source unit 60 includes a primary heat exchanger 68, and a heating secondary heat exchanger 222-1 and a hot water supply secondary heat exchange 222-2 on the secondary heat exchange unit 80 side. Since these details are as described above, the description is omitted.

  The circulation circuit 202 includes a primary heat exchanger 68, a heating secondary heat exchanger 222-1, a hot water supply heat exchanger 224-1, and a bathtub water heat exchanger 224-2. Heating water M heat-exchanged in the heating secondary heat exchanger 222-1 is heat-exchanged with the combustion exhaust gas EG by the primary heat exchanger 68. The hot water supply heat exchanger 224-1 is, for example, a plate heat exchanger, and water supply W that has been preheated in the hot water supply secondary heat exchanger 222-2 of the secondary heat exchange unit 80, and heating water M as a heat medium, Heat exchange. Hot water supply heat exchanger 224-2 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 226 includes, for example, a bathroom remote control 226-1 and a kitchen remote control 226-2.

<Effect of the third embodiment>

  (1) According to the hot water supply device 200, the same effects as those of the secondary heat exchange unit 80 and the heat source device 60 described above can be obtained, and the hot water supply device 200 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 embodiment and the third embodiment, a single primary heat exchanger 68 is provided and used for heating water. However, a plurality of primary heat exchangers 68 are provided, and heating water and bathtub water are used. It is good also as a structure which implement | achieves both by primary heating.

  b) The circulation circuit 202 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.

In the present invention, since a current-transforming member is provided in a housing having a plurality of heat exchange tubes for exchanging heat between the combustion exhaust and the fluid to be heated, stagnation and diffusion are caused in the combustion exhaust. Exchange is possible, heat recovery of combustion exhaust is improved, heat exchange efficiency is improved, and useful.

2 Secondary heat exchange unit 4 Case 6 Exhaust introduction part 8 Discharge part 10, 10-1, 10-2 Heat exchange part 12, 12-1, 12-2 Heat exchange pipe 14-1, 14-2, 14- 3 Baffle plate 14-11, 14-12 Current transformer 16 Ceiling plate 18 Bottom plate 20-1, 20-2 Header 24-1, 24-2, 24-3 Baffle plate 34-1, 34-2, 34- 3 baffle plates 54-1, 54-2 baffle plates 44-1, 44-2, 44-3 baffle plates 60 heat source machine 62 housing 64 combustion chamber 66 burner 68 primary heat exchanger 70 air supply fan 72 heat exchange pipe 80 Secondary heat exchange unit 82 Unit housing 84 Ceiling plate 86 Bottom plate 88 Exhaust space 90 Exhaust introduction part 92 Exhaust guide 94-1 First heat exchange part 94-2 Second heat exchange part 98 Exhaust part 100 Drain reservoir 102 -1,102-2 Heat exchange tube DESCRIPTION OF SYMBOLS 104 Baffle plate 106 Endothermic fin 200 Hot-water supply apparatus 202 Circulation circuit 204 Heating water tank 206 Water supply port 208 Water supply path 210 Hot water outlet 212 Recruitment circulation path 214 Pouring pipe line 216 Bathtub 218-1, 218-2, 218-3 Branch pipe 220 Heating / radiating terminal 220-1 Low temperature terminal 222-1 Heating secondary heat exchanger 222-2 Hot water supply secondary heat exchange 224-1 Hot water supply heat exchanger 224-2 Bathtub water heat exchanger 226 Remote control device 226-1 Bathroom remote control 226 -2 Kitchen remote control EG Combustion exhaust

Claims (6)

A casing for flowing combustion exhaust;
A plurality of heat exchange pipes for exchanging heat between the combustion exhaust and the fluid to be heated in the housing, and a first heat exchange section for allowing the first fluid to be heated to flow upstream of the combustion exhaust; A heat exchanging section including a second heat exchanging section for passing a second heated fluid different in circulation path from the first heated fluid downstream of the combustion exhaust ;
The combustion flow that is a current-transforming piece that changes the direction of the combustion exhaust gas that has flowed to the second heat exchanging portion from the second heat exchanging portion to the first heat exchanging portion, and is passed through the casing. One or two or more current-transforming members that collect or disperse the exhaust gas in the heat exchange pipe to exchange heat between the heat exchange pipe and the combustion exhaust gas;
A heat exchanger comprising:   The current transformation member includes a collision member that changes the flow direction of the combustion exhaust by causing the combustion exhaust to collide, a flow direction changing member that changes the flow direction of the combustion exhaust in one direction, and a part of the heat exchange pipe. The heat exchanger according to claim 1, comprising any of the surrounding members or a combination thereof. The current-transforming member has a first current-transforming piece that changes the direction of the combustion exhaust gas that has flowed to the second heat exchange part from the second heat exchange part to the first heat exchange part;
A second current changing piece for changing the direction of the combustion exhaust gas that has flowed to the first heat exchange section from the first heat exchange section to the second heat exchange section;
The heat exchanger according to claim 1 , comprising: A casing for flowing combustion exhaust after primary heat exchange;
A plurality of heat exchange pipes for exchanging heat between the combustion exhaust and the fluid to be heated in the casing, and a first heat exchange portion for passing the first fluid to be heated upstream of the combustion exhaust; A heat exchanging section including a second heat exchanging section for flowing a second heated fluid different in circulation path from the first heated fluid downstream of the combustion exhaust ;
The current-flowing piece that changes the direction of the combustion exhaust gas that has flowed to the second heat exchanging portion from the second heat exchanging portion to the first heat exchanging portion, and is passed through the housing portion. One or two or more current transformation members that collect or disperse the combustion exhaust gas in the heat exchange pipe to exchange heat between the heat exchange pipe and the combustion exhaust;
A secondary heat exchanger comprising: Secondary heat exchanger according to claim 4, characterized in that it comprises a heat exchanger according to claim 2 or claim 3 in the housing part. A heat exchanger according to any one of claims 1 to 3 is provided, or a secondary heat exchanger according to any one of claims 4 and 5 is provided to heat a fluid to be heated, and A heat source machine that performs hot water supply or heating using a heating fluid.

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