JP2015068507A - Heat exchanger and latent heat recovery type heat source machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger and a latent heat recovery type heat source machine capable of preventing scattering of drainage from an exhaust port of the heat source machine to the external, and preventing intrusion of rain water from the exhaust port to the inside of a secondary heat exchanger.SOLUTION: In a heat exchanger, a louver 2 is disposed between a heat transfer tube 31 and an exhaust port EP. The louver 2 includes a bent portion 2a, one end portion 2b, and the other end portion 2c. The bent portion 2a is formed to be projected upward in the vertical direction, and has inclined faces having downward gradients respectively toward one end portion 2b and the other end portion 2c. The louver 2 is disposed so that the inside of a case 30 at an inner side with respect to the louver 2, cannot be seen from the exhaust port EP when observed from a direction vertical to a front face.

Description

  The present invention relates to a heat exchanger for recovering latent heat of combustion gas and a latent heat recovery type heat source apparatus including the same.

  In heat source machines, highly efficient condensing (latent heat recovery) type heat source machines have become mainstream. In addition, there is an increasing need for downsizing from the viewpoint of installation space and workability.

  As a latent heat recovery type heat source machine, in order to improve thermal efficiency, a heat exchanger that recovers sensible heat and latent heat of the exhaust gas (latent heat held by water vapor in the combustion exhaust gas) has been put into practical use. Yes. When this secondary heat exchanger capable of recovering latent heat is used, the water vapor in the combustion exhaust gas is condensed and condensed due to the removal of latent heat, so that a large amount of drain (condensation water) is generated in the heat exchanger. Since the combustion exhaust gas contains nitrogen oxides, etc., it dissolves in the drain and the drain becomes acidic. A neutralizer is used to neutralize this acidic drain.

  Before this drain is neutralized by the neutralizer, it may be scattered from the exhaust port of the heat exchanger. A technique capable of preventing the drain from scattering is described in, for example, Japanese Patent Application Laid-Open No. 2007-232289 (Patent Document 1). This publication describes that the drain is prevented from scattering from the exhaust port of the heat exchanger by preventing the drain from entering the exhaust passage obliquely connected to the exhaust port.

JP 2007-232289 A

  In the above-mentioned latent heat recovery type heat source machine, it is necessary to newly add a secondary heat exchanger for recovering latent heat and a neutralizer for neutralizing drain generated in the secondary heat exchanger. It is required to make the secondary heat exchanger compact. When the secondary heat exchanger is made compact, the distance between the exhaust port and the heat transfer tube becomes short, and therefore, there is a problem that drain is scattered outside from the exhaust port by the combustion exhaust gas. In addition, since the distance between the exhaust port and the inside of the secondary heat exchanger becomes short, there is a problem that rainwater enters the inside of the secondary heat exchanger from the exhaust port.

  In the technology described in the above publication, when the distance between the exhaust port and the heat transfer tube becomes short due to the compactness of the secondary heat exchanger, the drain is scattered from the exhaust port by the combustion exhaust gas. Can not be prevented. In addition, it is impossible to prevent rainwater from entering the secondary heat exchanger from the exhaust port.

  The present invention has been made in view of the above problems, and its purpose is to prevent the drain from splashing from the exhaust port of the heat exchanger to the outside, and from the exhaust port to the inside of the secondary heat exchanger. A heat exchanger capable of preventing rainwater from entering, and a latent heat recovery type heat source apparatus including the heat exchanger.

  The heat exchanger of the present invention is for recovering the latent heat of combustion gas. The heat exchanger includes a heat transfer tube, a case, and a louver. The case has a front surface provided with an exhaust port that houses the heat transfer tube and connects the inside and the outside so that the combustion gas whose latent heat has been recovered by the heat transfer tube can be discharged to the outside. The louver is disposed between the heat transfer tube and the exhaust port. The louver includes a bent portion, one end portion located on the heat transfer tube side with respect to the bent portion, and the other end portion located on the opposite side to the one end portion. The bent portion is formed so as to protrude upward in the vertical direction, and has an inclined surface with a downward slope toward one end and the other end. The louver is provided so that the inside of the case inside the louver cannot be seen from the exhaust port when viewed from a direction perpendicular to the front surface.

  According to the heat exchanger of the present invention, the bent portion of the louver disposed between the heat transfer tube and the exhaust port is formed so as to protrude upward in the vertical direction, and at each of the one end portion and the other end portion. It has an inclined surface with a downward slope. The louver is provided so that the inside of the case inside the louver cannot be seen from the exhaust port when viewed from a direction perpendicular to the front surface of the housing. For this reason, the movement of the drain from the heat exchanger tube side to the exhaust port side can be prevented by the inclined surface on the one end portion side of the louver. Moreover, the intrusion of rainwater from the exhaust port into the secondary heat exchanger can be prevented by the inclined surface on the other end side of the louver. Therefore, it is possible to prevent the drain from scattering from the exhaust port of the heat exchanger to the outside, and to prevent rainwater from entering the secondary heat exchanger from the exhaust port.

  In the above heat exchanger, the louver includes first and second louver members. The first louver member and the second louver member are arranged side by side in the vertical direction. Thereby, since combustion gas passes between the 1st and 2nd louver members, exhaust resistance of combustion gas can be reduced.

  In said heat exchanger, the bending part of the 1st louver member is located upwards in the perpendicular direction rather than at least any one of the one end part and other end part of a 2nd louver member. For this reason, it is possible to prevent drain and rain water from passing between the first and second louver members by the bent portion of the first louver member.

  In the above heat exchanger, the louver is formed such that the horizontal distance from the bent portion to the other end is longer than the horizontal distance from the bent portion to the one end. Since rainwater entering from the exhaust port may have a higher flow rate than the drain carried by the combustion gas, the horizontal distance from the folded part to the other end is made longer than the horizontal distance from the folded part to one end. This effectively prevents rainwater from entering.

  The latent heat recovery type heat source apparatus of the present invention includes the above heat exchanger and a combustor for supplying combustion gas to the heat exchanger. As a result, the latent heat of the combustion gas generated in the combustor can be recovered, and it is possible to prevent the drain from scattering from the exhaust port of the heat exchanger to the outside, and the rainwater from the exhaust port to the inside of the secondary heat exchanger. It is possible to obtain a latent heat recovery type heat source device that can prevent the intrusion of water.

  As described above, according to the present invention, it is possible to prevent the drain from scattering from the exhaust port of the heat exchanger to the outside, and to prevent rainwater from entering the inside of the secondary heat exchanger from the exhaust port. A heat exchanger and a latent heat recovery type heat source apparatus including the heat exchanger can be obtained.

It is a perspective view showing roughly the composition of the latent heat recovery type heat source machine in one embodiment of the present invention. It is the schematic which shows roughly the structure of the latent-heat-recovery type heat source machine in one embodiment of this invention. It is a perspective view which shows roughly the structure of the heat exchanger in one embodiment of this invention from the bottom part side. It is a perspective view which shows roughly the structure of the heat exchanger in one embodiment of this invention from the ceiling part side. It is a top view which shows roughly the structure of the heat exchanger in one embodiment of this invention. It is a partially broken perspective view which shows roughly the structure of the heat exchanger in one embodiment of this invention. It is sectional drawing which follows the VII-VII line of FIG. It is an enlarged view of the P section of FIG. It is a top view which shows roughly the structure of the exhaust port periphery seen from the arrow A direction of FIG. It is a top view which shows roughly the structure of the louver periphery seen from the arrow B direction of FIG.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
First, the configuration of the latent heat recovery type heat source machine according to the embodiment of the present invention will be described.

  With reference to FIG. 1 and FIG. 2, the latent heat recovery type heat source machine of the present embodiment is a latent heat recovery type heat source machine, and is configured to be able to collect and discharge drain generated in the heat source machine. The latent heat recovery type heat source machine of the present embodiment includes a housing 1, a secondary heat exchanger (heat exchanger) 3, a primary heat exchanger 4, a combustor 5, a blower 6, and an exhaust collecting cylinder 7. The silencer 8, the neutralizer 9, the pipe 10, the water supply pipe 11, the water inlet 11a, the hot water supply pipe 12, the hot water outlet 12a, the header 13, the first holding member 14, and the second holding member. 15 and the drainage member 16 are mainly included.

  The housing 1 is configured such that the secondary heat exchanger 3, the primary heat exchanger 4, the combustor 5, the blower 6, the exhaust collecting cylinder 7, the silencer 8, the neutralizer 9, and the like can be accommodated therein. The housing 1 has a substantially rectangular parallelepiped outer shape. The housing 1 has a wide front surface 1a and a narrow side surface 1b. The front surface 1a of the housing 1 is formed by a lid member CO. The exhaust top ET of the secondary heat exchanger 3 is formed so as to protrude outward from the lid member CO. An exhaust port EP is provided in the exhaust top ET. The exhaust port EP is configured to be able to exhaust the combustion gas from which latent heat has been recovered by the secondary heat exchanger 3 to the outside of the housing 1. Further, the side surface 1b of the housing 1 is provided with a water inlet 11a for water supply and a hot water outlet 12a for hot water supply.

  The secondary heat exchanger 3 is a latent heat recovery type heat exchanger. The combustion gas after heat exchange that has been discharged conventionally is passed through the secondary heat exchanger 3 so that the water in the secondary heat exchanger 3 is preheated. In this process, the temperature of the combustion gas is lowered to about 60 ° C., so that moisture contained in the combustion gas is condensed and latent heat can be obtained.

  The primary heat exchanger 4 is a sensible heat recovery type heat exchanger. Hot water in the primary heat exchanger 4 is heated by heat exchange with the high-temperature combustion gas. One end of the primary heat exchanger 4 and one end of the secondary heat exchanger 3 are connected to each other by a pipe 10. A water supply pipe 11 is connected to the other end of the secondary heat exchanger 3, and a hot water supply pipe 12 is connected to the other end of the primary heat exchanger 4. The primary heat exchanger 4 is disposed closer to the combustor 5 than the secondary heat exchanger 3.

  The combustor 5 generates combustion gas for performing heat exchange between the primary heat exchanger 4 and the secondary heat exchanger 3 and supplies the combustion gas to the primary heat exchanger 4 and the secondary heat exchanger 3. Is. The combustor 5 is a reverse combustion type device in which fuel such as atomized kerosene supplied from a fuel supply source (not shown) is sprayed downward and burned. The combustor 5 is specifically a burner, for example. The blower 6 is for supplying air necessary for combustion to the combustor 5. The blower 6 is configured to be able to supply combustion air downward from above the combustor 5. The blower 6 is specifically a fan, for example.

  The exhaust collecting cylinder 7 and the silencer 8 constitute a combustion gas flow path connected in series. The exhaust collecting cylinder 7 is located on the downstream side of the primary heat exchanger 4. The silencer 8 is located on the downstream side of the exhaust collecting cylinder 7. As shown by arrows in FIG. 2, the combustion gas generated in the combustor 5 passes through the periphery of the primary heat exchanger 4 and exchanges heat with water in the primary heat exchanger 4, and then passes through the exhaust collecting cylinder 7. After being sent to the silencer 8, it is supplied to the secondary heat exchanger 3.

  As described above, drainage of the drain is necessary because condensed water (drain) is generated due to the structure in which the water vapor of the combustion gas is condensed in the secondary heat exchanger 3. A tubular drain member 16 for draining the drain is attached to the bottom of the secondary heat exchanger 3. A neutralizer 9 is disposed below the secondary heat exchanger 3, and the secondary heat exchanger 3 and the neutralizer 9 are connected by a drainage member 16. Drain is drained from the secondary heat exchanger 3 to the neutralizer 9 through the drainage member 16. Since the combustion gas contains nitrogen oxides and the like, it dissolves in the drain and the drain becomes acidic. The neutralizer 9 is for neutralizing the acidic drain. The neutralizer 9 is filled with a neutralizing agent for neutralizing acidic drain. The drain neutralized by the neutralizer 9 is discharged out of the housing 1 through a drainage channel (not shown).

  The water inlet 11 a is connected to the water supply pipe 11 and configured to be able to supply water to the secondary heat exchanger 3 via the water supply pipe 11. The hot water outlet 12a is connected to the hot water supply pipe 12, and is configured to be able to supply hot water heated by the primary heat exchanger 4. Thereby, the water supplied from the water inlet 11a is heated by the combustion gas when passing through the secondary heat exchanger 3 and the primary heat exchanger 4, and is supplied from the hot water outlet 12a.

  The header 13 has a pair of headers 13a and 13b. The header 13a is connected to a heat transfer tube and a pipe 10 of the secondary heat exchanger 3 described later. The header 13b is connected to the heat transfer pipe and the water supply pipe 11 of the secondary heat exchanger 3 to be described later. The first holding member 14 holds the secondary heat exchanger 3 on the inner wall of the housing 1, and the second holding member 15 holds the secondary heat exchanger 3 on the upper end portion of the silencer 8.

  Next, the configuration of the secondary heat exchanger according to the present embodiment will be described in detail with reference to FIGS. For convenience of explanation, in FIGS. 4 to 6, a part is indicated by a broken line so that the internal structure can be easily seen. The secondary heat exchanger of the present embodiment is a heat exchanger for recovering the latent heat of the combustion gas.

  3 to 5, secondary heat exchanger 3 mainly includes louver 2, case 30, heat transfer tube 31, and spacer 32. The case 30 houses the louver 2, the heat transfer tube 31, the spacer 32, the holder 33, the prevention member 34, and the like. An exhaust top ET is provided on the front surface of the case 30. The exhaust top ET is formed so as to protrude to the front side of the case 30. An exhaust port EP for connecting the inside and the outside is provided on the front surface of the case 30 so that the combustion gas whose latent heat has been recovered by the heat transfer tube 31 can be exhausted to the outside. The exhaust top ET is configured to project outward from the lid member CO in a state of being attached to the housing 1 shown in FIG. 1 from the inside.

  The case 30 has an intake port IP for intake of combustion gas. The intake port IP is formed in the bottom BP on one side of the case 30. The intake port IP is configured to be supplied with combustion gas from the silencer 8 shown in FIG. A heat transfer tube 31 is disposed on the other side surface of the case 30 so as not to overlap with the intake port IP in a plan view. In other words, the heat transfer tubes 31 are arranged so as to be shifted from the intake port IP in the width direction of the case 30 in plan view.

  The heat transfer tube 31 is for exchanging heat between the combustion gas, which is a heating gas, and the fluid to be heated, and has an internal flow path for circulating the fluid to be heated. The heat transfer tube 31 has a plurality of spiral tubes. The plurality of spiral tubes are stacked by being spirally wound with a gap in the facing direction in which the ceiling portion RP and the bottom portion BP of the case 30 face each other.

  In plan view, the heat transfer tube 31 has a substantially rectangular shape, and the intake port IP is disposed along the short side of the heat transfer tube 31, and the exhaust port EP extends along the long side of the heat transfer tube 31. Has been placed. The dimension on the long side of the intake port IP is substantially the same as the dimension on the short side of the heat transfer tube 31. As indicated by the arrows in FIG. 5, the combustion gas supplied from the intake port IP to the secondary heat exchanger 3 flows around the heat transfer tube 31 in the longitudinal direction of the heat transfer tube 31 and flows through the heat transfer tube 31. After exchanging heat, the air is exhausted from the exhaust port EP.

  Each of the plurality of spiral tubes penetrates the other side surface of the case 30 and is connected to the pair of headers 13a and 13b. A plurality of spiral pipes can be easily connected to the pipe 10 and the water supply pipe 11 by the pair of headers 13a and 13b. The pair of headers 13 a and 13 b are attached to the outer wall on the other side surface of the case 30. Since the pair of headers 13a and 13b are attached together on the other side surface, the connection work of the pipe 10 and the water supply pipe 11 is facilitated.

  The spacer 32 is inserted into a part of the gap in the stacking direction of the plurality of spiral tubes. The spacer 32 holds a plurality of spiral tubes. The spacer 32 extends in the front-rear direction of the case 30. In plan view, the spacer 32 extends from the outside to the center of the plurality of spiral tubes. The spacer 32 is disposed at a position overlapping the exhaust port EP in the front-rear direction of the case 30.

  The louver 2 is intended to prevent the drain from scattering from the exhaust port EP to the outside and to prevent rainwater from entering the inside of the secondary heat exchanger 3 from the exhaust port EP. The louver 2 is disposed between the heat transfer tube 31 and the exhaust port EP. The louver 2 has first and second louver members 21 and 22. Note that the number of louver members is not limited to two and may be one or more. That is, the number of louvers 2 may be one.

  Referring to FIG. 6, louver 2 is held in case 30 by holder 33. The holder 33 has a central portion 33a and both end portions 33b provided at both ends of the central portion 33a. A central portion 33 a of the holder 33 is fixed to the inner wall of the case 30. Both end portions 33 b of the holder 33 hold the louver 2 by sandwiching both ends in the width direction of the louver 2. Grooves are formed in both end portions 33b of the holder 33. Projections formed at both ends of the louver 2 in the width direction are fitted into the groove. Further, the prevention member 34 is fixed to both end portions 33 b of the holder 33. The prevention member 34 is disposed below the louver 2.

  7 and 8, louver 2 has an L shape in a cross-sectional view. The louver 2 has a bent portion 2a, one end portion 2b, and the other end portion 2c. The one end 2b is located on the heat transfer tube 31 side with respect to the bent portion 2a. The other end 2c is located on the opposite side to the one end 2b. The bent portion 2a is formed so as to protrude upward in the vertical direction, and has an inclined surface with a downward slope toward each of the one end portion 2b and the other end portion 2c.

  In the present embodiment, the first louver member 21 and the second louver member 22 are arranged side by side in the vertical direction. The first louver member 21 and the second louver member 22 may have the same shape.

  The bent portion 2a of the first louver member 21 is located above the one end portion 2b and the other end portion 2c of the second louver member 22 in the vertical direction. In the present embodiment, the bent portion 2a of the first louver member 21c is positioned above the other end portion 2c of the second louver member 22 by a vertical distance DA in the vertical direction.

  In the horizontal direction, the first louver member 21 is disposed closer to the exhaust port EP than the second louver member 22. In the horizontal direction, the first louver member 21 and the second louver member 22 may be arranged at an equal distance from the exhaust port EP.

  In both the first louver member 21 and the second louver member 22 of the louver 2, the horizontal distance DC from the bent portion 2a to the other end portion 2c is longer than the horizontal distance DB from the bent portion 2a to the one end portion 2b. It is formed as follows. Specifically, the horizontal distance DB from the bent portion 2a to the one end portion 2b is a horizontal distance from the apex of the bent portion 2a to the one end portion 2b. Similarly, the horizontal distance DC from the bent portion 2a to the other end 2c is a horizontal distance from the apex of the bent portion 2a to the other end 2c.

  Further, both the first louver member 21 and the second louver member 22 of the louver 2 have the other end portion from the apex of the bent portion 2a to the length dimension of the inclined surface from the apex of the bent portion 2a to the one end portion 2b. The length of the inclined surface up to 2c is formed to be long.

  The prevention member 34 is formed so as to protrude upward in the vertical direction. The vertex of the prevention member 34 is located above the other end 2c of the first louver member 21 in the vertical direction.

  Referring to FIGS. 8 and 9, louver 2 is provided such that the interior of case 30 inside louver 2 cannot be seen from exhaust port EP when viewed from a direction perpendicular to the front surface of case 30. ing. Here, the inner side than the louver 2 means the inner side of the innermost portion of the louver 2. The first louver member 21 and the second louver member 22 are arranged so as to overlap the exhaust port EP when viewed from the direction of arrow A in FIG. Specifically, the second louver member 22 is disposed in a region between the upper end of the exhaust port EP and the lower end of the second louver member 22. The first louver member 21 is disposed in a region between the lower end of the second louver member 22 and the lower end of the first louver member 21. A prevention member 34 is disposed in a region between the lower end of the first louver member 21 and the lower end of the exhaust port EP. The other end 2 c of the first louver member 21 is disposed below the upper end of the prevention member 34.

  Referring to FIGS. 8 and 10, louver 2 is provided such that exhaust port EP is not visible when viewed from the inside of case 30 in a direction perpendicular to the front surface. When viewed from the direction of arrow B in FIG. 8, the first louver member 21 and the second louver member 22 are provided so as to cover the exhaust port EP.

  In the present embodiment, since the exhaust port EP is formed by one opening, wind noise when the combustion gas passes through the exhaust port EP can be suppressed. In other words, for example, when the exhaust port EP is formed by two openings by the beam disposed in the center of the exhaust port EP, a loud wind noise is generated by the beam. Since no beams are provided, wind noise can be suppressed.

  In the present embodiment, the other end 2c of the louver 2 is formed by a portion where a plate material that is a material of the louver 2 is bent. Thereby, the wind noise when combustion gas passes the other end part 2c can be suppressed. Furthermore, since the other end 2c is rounded, it is possible to prevent the operator from cutting his / her hand at the other end 2c.

Next, the effect of this Embodiment is demonstrated.
According to the secondary heat exchanger 3 of the present embodiment, as shown in FIG. 8, the bent portion 2a of the louver 2 disposed between the heat transfer tube 31 and the exhaust port EP protrudes upward in the vertical direction. And has an inclined surface with a downward slope toward each of the one end 2b and the other end 2c. As shown in FIG. 9, the louver 2 is provided so that the inside of the case 30 inside the louver 2 cannot be seen from the exhaust port EP when viewed from a direction perpendicular to the front surface of the housing 1. Yes. For this reason, the movement of the drain from the heat exchanger tube 31 side to the exhaust port EP side can be prevented by the inclined surface on the one end 2b side of the louver 2. Further, the inclined surface on the other end 2c side of the louver 2 can prevent rainwater from entering the secondary heat exchanger 3 from the exhaust port EP. Therefore, it is possible to prevent the drain from being scattered from the exhaust port EP of the secondary heat exchanger 3 to the outside, and to prevent rainwater from entering the inside of the secondary heat exchanger 3 from the exhaust port EP. By preventing intrusion of rainwater, algae can be prevented from being generated by rainwater in the secondary heat exchanger 3.

  Moreover, since the movement of the drain from the heat transfer tube 31 side to the exhaust port EP side can be prevented by the bent portion 2a on the one end portion 2b side of the louver 2, the one end portion 2b of the louver 2 is disposed close to the heat transfer tube 31. However, it is possible to prevent the drain from scattering from the exhaust port EP of the secondary heat exchanger 3 to the outside. Therefore, compactness can be realized by arranging the one end portion 2 b of the louver 2 close to the heat transfer tube 31.

  Further, since the bent portion 2a of the louver 2 is formed so as to protrude upward in the vertical direction, the drain and rain water adhering to the louver 2 move downward along the bent portion 2a. For this reason, it is possible to prevent drain and rainwater from staying in the louver 2.

  According to the secondary heat exchanger 3 of the present embodiment, as shown in FIG. 8, the first louver member 21 and the second louver member 22 are arranged side by side in the vertical direction. Thereby, since combustion gas passes between the 1st and 2nd louver members 21 and 22, exhaust resistance of combustion gas can be reduced. Further, the rotational speed of the blower 6 can be reduced by reducing the exhaust resistance. Thereby, the sound which the air blower 6 generate | occur | produces can be made small.

  According to the secondary heat exchanger 3 of the present embodiment, as shown in FIG. 8, the bent portion 2 a of the first louver member 21 has the one end 2 b and the other end 2 c of the second louver member 22. It is located above in the vertical direction at least. Therefore, the bent portion 2a of the first louver member 21 can prevent drain and rain water from passing between the first and second louver members 21 and 22.

  According to the secondary heat exchanger 3 of the present embodiment, as shown in FIG. 8, the louver 2 has a horizontal distance DB from the bent portion 2a to the one end portion 2b that is longer than the bent portion 2a to the other end portion 2c. The horizontal distance DC is formed to be long. Since rainwater entering from the exhaust port EP may have a higher flow rate than the drain carried by the combustion gas, the bent portion 2a to the other end portion 2c are more than the horizontal distance DB from the bent portion 2a to the one end portion 2b. Intrusion of rainwater can be effectively prevented by increasing the horizontal distance DC.

  According to the latent heat recovery type heat source machine of the present embodiment, as shown in FIG. 2, the secondary heat exchanger 3 and the combustor 5 for supplying combustion gas to the secondary heat exchanger 3 are provided. I have. Thereby, the latent heat of the combustion gas generated in the combustor 5 can be recovered, and the scattering of drain from the exhaust port EP of the secondary heat exchanger 3 to the outside is prevented, and the secondary heat exchange from the exhaust port EP. A latent heat recovery type heat source device that can prevent rainwater from entering the inside of the vessel 3 can be obtained.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  DESCRIPTION OF SYMBOLS 1 Housing, 1a Front surface, 1b Side surface, 2 Louver, 2a Bending part, 2b One end part, 2c Other end part, 3 Secondary heat exchanger, 4 Primary heat exchanger, 5 Combustor, 6 Blower, 7 Exhaust collecting cylinder, 8 silencer, 9 neutralizer, 10 pipe, 11 water supply pipe, 11a water inlet, 12 hot water supply pipe, 12a hot water outlet, 13, 13a, 13b header, 14 first holding member, 15 second holding member, 16 drainage member , 21 1st louver member, 22 2nd louver member, 30 case, 31 heat transfer tube, 32 spacer, 33 holder, 34 prevention member, BP bottom, CO lid member, EP exhaust port, ET exhaust top, IP intake Mouth, RP ceiling.

Claims (5)

A heat exchanger for recovering the latent heat of combustion gas,
A heat transfer tube,
A case having a front surface in which the heat transfer tube is housed and provided with an exhaust port connecting the inside and the outside so that the combustion gas whose latent heat has been recovered by the heat transfer tube can be exhausted to the outside;
A louver disposed between the heat transfer tube and the exhaust port;
The louver includes a bent portion, one end portion located on the heat transfer tube side with respect to the bent portion, and the other end portion located on the opposite side to the one end portion,
The bent portion is formed so as to protrude upward in the vertical direction, and has an inclined surface with a downward slope toward each of the one end portion and the other end portion,
The louver is provided such that the interior of the case inside the louver cannot be seen from the exhaust port when viewed from a direction perpendicular to the front surface. The louver includes first and second louver members;
The heat exchanger according to claim 1, wherein the first louver member and the second louver member are arranged side by side in the vertical direction.   The bent portion of the first louver member is located above the at least one of the one end and the other end of the second louver member in the vertical direction. Heat exchanger.   The louver is formed such that a horizontal distance from the bent portion to the other end is longer than a horizontal distance from the bent portion to the one end. The described heat exchanger. A latent heat recovery type heat source device comprising the heat exchanger according to any one of claims 1 to 4 and a combustor for supplying the combustion gas to the heat exchanger.

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