JP5061009B2 - Latent heat recovery type heat source machine - Google Patents

Description

  The present invention relates to a latent heat recovery type heat source machine that takes measures against noise.

Conventionally, a water heater has a disadvantage that noise from combustion of a gas burner, driving sound of an air supply fan, exhaust sound of exhaust gas, etc. leaks to the outside through an exhaust port. Therefore, various noise countermeasures are taken for the water heater (Patent Document 1, Patent Document 2, Patent Document 3, etc.). For example, according to the water heater shown in FIG. 6, the duct rectifying plate 606 is provided by bending the exhaust passage from the exhaust outlet 603 of the heat exchanger 602 to the exhaust port 604 of the appliance, and the lower rectifying portion of the duct rectifying plate 606 is provided. A sound absorbing material 616 is provided between 612 and the upper rectifying unit 613, and the sound absorbing material 616 absorbs sound to reduce noise (Patent Document 1). Further, according to the water heater shown in FIG. 7, the exhaust passage extending from the exhaust outlet of the heat exchanger 701 to the exhaust outlet 703 of the appliance is divided into a front exhaust passage 704 and a rear exhaust passage 705 having different passage lengths. The merging portion 707 in front of the exhaust port 703 is combined, and the phase of the noise wavelength is given by the exhaust passages 704 and 705, and the noise is reduced by canceling the combustion noise by interfering with each other at the merging portion 707. (Patent Document 2 and Patent Document 3).
JP 2000-227213 A Japanese Utility Model Publication No. 8-10742 Japanese Utility Model Publication No. 2-144366

  By the way, there is a latent heat recovery type water heater that recovers latent heat from water vapor in combustion exhaust as a water heater (heat source device). This latent heat recovery type water heater is equipped with a latent heat exchanger that absorbs latent heat from the combustion exhaust at a position downstream of the exhaust of the sensible heat exchanger. It is possible to improve.

  Each of the conventional examples shown in FIGS. 6 and 7 is a water heater that does not include a latent heat exchanger. However, it is conceivable to take the same noise countermeasures as described above in the latent heat recovery type water heater. However, in the case of a latent heat recovery type water heater, strong acid drain is always generated on the latent heat exchanger, so if a sound absorbing material is provided in the exhaust passage, the sound adheres to the sound absorbing material and lowers the sound absorption rate. The sound absorbing material may corrode and reduce durability. On the other hand, if the exhaust passage is divided into two and the auxiliary exhaust passage is provided, there is a possibility that the drain caught by the exhaust flow is scattered outside the instrument through the auxiliary exhaust passage.

  This invention is made | formed in view of the said situation, and makes it a subject to provide the latent-heat-recovery-type heat-source machine which suppresses the noise which leaks outside, without scattering drain from an exhaust port.

The latent heat recovery type heat source machine according to the present invention is:
Latent heat in which a secondary heat exchange chamber equipped with a latent heat exchanger that absorbs latent heat from the combustion exhaust is disposed downstream of the primary heat exchange chamber equipped with a sensible heat exchanger that absorbs sensible heat from the combustion exhaust. In the recovery heat source machine,
The secondary heat exchange chamber
A casing that is formed in a box and has an exhaust port that opens combustion exhaust to the outside of the instrument on its front plate;
The exhaust heat guide plate attached to the upper region in the casing and the drain guide plate attached to the lower region in the casing surround the upper and lower sides of the latent heat exchanger, and the primary heat exchange at the rear of the drain guide plate An exhaust inlet for allowing combustion exhaust from the chamber to flow in, and a heat exchange chamber in which an exhaust outlet for discharging combustion exhaust is formed by an opening between the exhaust guide plate and the front end of the drain guide plate;
Upper and lower walls are formed by an exhaust rectification upper plate and an exhaust rectification lower plate that are inclined upwardly from the exhaust outlet to the exhaust outlet, and combustion exhaust in the heat exchange chamber is exhausted from the exhaust outlet to the exhaust outlet. An exhaust duct that forms a main exhaust passage that flows to the mouth,
The exhaust guide plate that forms the heat exchange chamber is provided with a bypass inlet hole, and the exhaust rectification upper plate that forms the exhaust duct is provided with a bypass outlet hole so that the combustion exhaust in the heat exchange chamber is bypassed by the bypass. A sub exhaust passage is formed that flows from the inlet hole through the space between the heat exchange chamber and the casing into the exhaust duct from the bypass outlet hole,
A cover portion of a size that hides the bypass outlet hole from the exhaust port is formed so as to stand out inside the exhaust duct or outside the exhaust duct in front of the bypass outlet hole .

From the above configuration, the secondary heat exchange chamber is provided with two exhaust passages for combustion exhaust, a main exhaust passage and a sub exhaust passage, and these main exhaust passage and sub exhaust passage are joined by an exhaust duct. Thus, the noise transmitted separately to the main exhaust passage and the sub exhaust passage can be canceled by interfering with each other at the exhaust merging portion of the exhaust duct provided with the bypass outlet hole. Accordingly, noises such as burner combustion noise and exhaust noise can be canceled to reduce noise leaking from the exhaust port to the outside of the appliance.
Moreover, since the cover portion having a size hidden from the exhaust port is formed in front of the bypass outlet hole in the exhaust duct, the combustion exhaust gas flowing out from the bypass outlet hole into the exhaust duct is formed. Even if the drain is caught in the cover, the drain can be prevented from falling on the cover portion and being scattered from the exhaust port to the outside of the instrument.

The exhaust port dimension is formed smaller than the outlet dimension of the exhaust duct,
The bypass outlet holes are formed on the left and right sides of the upper plate for exhaust rectification by cutting out both front corners of the inclined plate portion that is inclined upwardly from the exhaust outlet to the exhaust outlet, You may comprise a bypass exit hole so that the dimension of the magnitude | size hidden in the front-plate part of the right-and-left both sides of the said exhaust port used as the said cover part formed outside the said exhaust duct may be set.
Thereby, since the said exhaust-port dimension is formed small with respect to the exit dimension of the said exhaust duct, it can suppress further that noise leaks out of an instrument. In addition, since the front plate portions on both the left and right sides of the exhaust port become cover portions that stand in front of the bypass outlet hole, the front plate portion is caught in the combustion exhaust gas flowing out from the bypass outlet hole into the exhaust duct. It is possible to prevent the drain from being scattered from the exhaust port to the outside of the instrument.

The bypass inlet hole is preferably disposed on the exhaust downstream side in the heat exchange chamber.
Thereby, the ratio of the combustion exhaust gas flowing out from the bypass inlet hole without exchanging heat with the latent heat exchanger can be reduced, and the thermal efficiency is not lowered.

  As described above, according to the present invention, noise that leaks to the outside can be reduced as a latent heat recovery type heat source device without scattering drain from the exhaust port.

Hereinafter, embodiments of the present invention will be described.
As shown in the overall configuration diagram of FIG. 1, a latent heat recovery type water heater (heat source machine) 1 is provided with a combustion chamber 3, a primary heat exchange chamber 4, and a secondary heat exchange chamber 5 in an exterior case 10. Yes.

  The combustion chamber 3 includes a rectangular burner box 30 that opens upward, and a gas burner 31 disposed in the burner box 30. An air supply fan 2 that supplies combustion air to the gas burner 31 is connected to the bottom plate of the burner box 30.

  The primary heat exchange chamber 4 includes a rectangular barrel body frame 40 that opens upward and downward, and a sensible heat exchanger 41 disposed in the trunk frame 40. The body frame 40 is connected to the upper end of the burner box 30 at the lower end. The sensible heat exchanger 41 includes a first endothermic fin group 42 in which a large number of fins are arranged in parallel, and a first endothermic tube 43 that passes through the first endothermic fin group 42 in a meandering manner. The first heat absorption pipe 43 is formed of a copper pipe or the like.

  The secondary heat exchange chamber 5 includes a rectangular casing 50 that opens downward, and a latent heat exchanger 51 disposed in the casing 50. The casing 50 has a lower end portion connected to the upper end portion of the trunk frame 40. The latent heat exchanger 51 is configured by a second heat absorption pipe 52 disposed in a meandering manner in the casing 50. The second heat absorption pipe 52 is formed of an acid-resistant titanium pipe, stainless steel pipe, or the like. A drain receiving portion 11 is provided at the bottom of the secondary heat exchange chamber 5, and a drain discharge pipe 12 connected to a drain neutralizing device 13 is connected to the drain receiving portion 11.

  The second endothermic pipe 52 is connected at its upstream end to a water supply pipe (not shown) for guiding cold water such as a water pipe or a return pipe of a hot water heater, and at its downstream end upstream from the first endothermic pipe 43. The ends are connected. And, the downstream end of the first heat absorption pipe 43 is connected to a hot water pipe (not shown) that guides hot water to a bathroom, a kitchen currant, a hot water heater or the like.

Next, the configuration of the secondary heat exchange chamber 5 will be described in detail.
As shown in FIGS. 2 to 4, the casing 50 includes a front plate 501, a rear plate 502, a left side plate 503, a right side plate 504, and a ceiling plate 505, and is formed in a rectangular box that opens downward. Yes. A horizontally elongated exhaust port 53 is provided at a substantially central portion of the front plate 501. An exhaust top 54 is attached to the exhaust port 53 (see FIG. 2). In the casing 50, an exhaust guide plate 61 is attached to the upper region, and a drain guide plate 62 is attached to the lower region. Accordingly, the inside of the casing 50 surrounded by the exhaust guide plate 61, the drain guide plate 62, the left side plate 503 and the right side plate 504 of the casing 50 is the heat exchange chamber 60. A latent heat exchanger 51 is disposed in the heat exchange chamber 60 (see FIG. 2).

  The exhaust guide plate 61 has a rear portion connected to the ceiling plate 505 of the casing 50 by welding or the like, and is disposed so as to be inclined downward toward the front plate 501 having the exhaust port 53. A front portion 611 connected to the front end of the intermediate portion 610 of the exhaust guide plate 61 is bent downward. The left and right ends of the exhaust guide plate 61 are in close contact with the left side plate 503 and the right side plate 504 of the casing 50, respectively. On the other hand, the drain guide plate 62 has a rear end connected to the rear plate 502 of the casing 50 by welding or the like, and is inclined and inclined downward toward the front plate 501 having the exhaust port 53. The left and right ends of the drain guide plate 62 are also in close contact with the left side plate 503 and the right side plate 504 of the casing 50, respectively.

  In addition, a horizontally long exhaust inlet 63 for introducing combustion exhaust gas from the primary heat exchange chamber 4 into the heat exchange chamber 60 is formed at the rear portion of the drain guide plate 62, and a front portion 611 of the exhaust guide plate 61 is provided. An exhaust outlet 64 for discharging the combustion exhaust from the heat exchange chamber 60 is formed by an opening between the lower end and the front end of the drain guide plate 62. The exhaust outlet 64 is disposed at a position lower than the exhaust port 53 provided in the front plate 501 facing the exhaust outlet 64. An exhaust rectification upper plate 7 and an exhaust rectification lower plate 8 are disposed between the exhaust outlet 64 and the exhaust outlet 53. A funnel-shaped drain receiving portion 11 is disposed below the exhaust rectifying lower plate 8.

  The upper plate 7 for exhaust rectification is provided upright from an inclined plate portion 71 inclined upwardly from the lower end of the front portion 611 of the exhaust guide plate 61 to the exhaust port 53 and from the front end of the inclined plate portion 71. The mounting plate portion 72 is attached to the back surface of the front plate 501 by welding or the like, and the flange portion 73 is provided continuously with the rear end of the inclined plate portion 71 and is bent upward. On the other hand, the exhaust rectifying lower plate 8 is attached to the front end of the drain guide plate 62 by welding or the like, and has a first inclined plate portion 82 inclined downward so as to extend to the drain receiving portion 11, and a first inclined The second inclined plate portion 81 is inclined upwardly from the front end of the plate portion 82 to the lower side of the exhaust port 53. Accordingly, the exhaust rectifying upper plate 7, the exhaust rectifying lower plate 8, the left side plate 503 and the right side plate 504 of the casing 50 communicate with the exhaust from the exhaust outlet 64 of the heat exchange chamber 60 to the exhaust port 53 of the casing 50. A duct 9 is formed. As a result, the combustion exhaust in the heat exchange chamber 60 passes through the exhaust outlet 64 and flows into the exhaust duct 9, and this passage serves as the main exhaust passage R1.

On the other hand, the exhaust guide plate 61 constituting the heat exchange chamber 60 is formed with a bypass inlet hole 65 for introducing the combustion exhaust in the heat exchange chamber 60 into the space A between the heat exchange chamber 60 and the casing 50. The exhaust rectification upper plate 7 constituting the exhaust duct 9 is formed with a bypass outlet hole 74 for discharging combustion exhaust gas from the space A into the exhaust duct 9 (see FIGS. 2 and 4). That is, apart from the main exhaust passage R 1, the combustion exhaust in the heat exchange chamber 60 passes from the bypass inlet hole 65 through the space A between the heat exchange chamber 60 and the casing 50 and from the bypass outlet hole 74 to the exhaust duct 9. This passage is a sub exhaust passage R2.
In this way, the exhaust passage of combustion exhaust is divided into two parts, the main exhaust passage R1 and the sub exhaust passage R2, and the main exhaust passage R1 and the sub exhaust passage R2 are joined by the exhaust duct 9 to interfere with each other.

  The bypass inlet hole 65 includes a plurality of through holes formed through the exhaust guide plate 61. The bypass inlet holes 65 made of these through holes are preferably arranged as much as possible on the exhaust downstream side in the heat exchange chamber 60, and are bent at the intermediate portion 610 of the exhaust guide plate 61 in the one shown in FIGS. It is formed in the vicinity of the front part 611. Thereby, the ratio of the combustion exhaust gas which flows out from the bypass inlet hole 65 without being heat-exchanged by the latent heat exchanger 51 can be reduced, and a decrease in thermal efficiency can be prevented. The bypass inlet hole 65 may be formed on the inclined surface of the front portion 611 of the exhaust guide plate 61.

  On the other hand, the bypass outlet holes 74 are formed on the left and right sides by cutting out both corners of the front end of the inclined plate portion 71 of the exhaust rectifying upper plate 7. The lateral width of the outlet 91 of the exhaust duct 9 by the exhaust rectifying upper plate 7 and the exhaust rectifying lower plate 8 is set to be approximately equal to the lateral width of the front plate 501, whereas it is opened on the front plate 501. The width of the exhaust port 53 is set to be shorter than the width of the front plate 501 (see FIG. 3). That is, the lateral width dimension of the exhaust port 53 is shorter than the lateral width dimension of the outlet 91 of the exhaust duct 9. The left and right bypass outlet holes 74 are formed by notching ranges that do not enter the exhaust port 53 from the left and right ends of the inclined plate portion 71 of the exhaust rectifying upper plate 7. The size is set so as to be hidden by the portion 501. Note that the bypass outlet hole 74 shown in FIGS. 3 and 4 is cut out to a length that reaches the left and right sides of the exhaust port 53. As a result, the front plates 501 on both the left and right sides of the exhaust port 53 stand up in front of each bypass outlet hole 74 in the exhaust duct 9 to become a cover portion K. Therefore, even if the drain is caught in the combustion exhaust gas flowing out from the bypass outlet hole 74 into the exhaust duct 9, the drain hits the portion of the front plate 501 (the cover portion K) on the left and right sides of the exhaust port 53. It can be prevented from being dropped and scattered from the exhaust port 53.

  In the latent heat recovery type water heater 1 having the above configuration, high-temperature combustion exhaust is generated in the combustion chamber 3 by the combustion of the gas burner 31, and this combustion exhaust is supplied to the primary heat exchange chamber 4 and the secondary heat by the supply fan 2. It is sent to the exchange room 5 in order. Then, in the primary heat exchange chamber 4 to which the combustion exhaust is sent from the combustion chamber 3, the low-temperature water flowing in the first heat absorption pipe 43 through the first heat absorption fin group 42 absorbs sensible heat from the combustion exhaust and generates heat. Exchange heat. Next, when the combustion exhaust gas that has passed through the primary heat exchange chamber 4 is sent to the latent heat exchanger 51 of the secondary heat exchange chamber 5, the water flowing in the second heat absorption pipe 52 absorbs the latent heat from the water vapor in the combustion exhaust gas. Then, heat exchange is performed. Then, the combustion exhaust after the latent heat is absorbed is discharged from the exhaust top 54 to the outside of the instrument.

  By the way, in the secondary heat exchange chamber 5, as described above, the main exhaust passage through which the exhaust duct 9 is connected to the exhaust outlet 64 and the combustion exhaust in the heat exchange chamber 60 is sent from the exhaust outlet 64 to the exhaust duct 9. R1 and the exhaust guide plate 61 are provided with a bypass inlet hole 65 and the exhaust rectification upper plate 7 constituting the exhaust duct 9 is provided with a bypass outlet hole 74 to heat the combustion exhaust in the heat exchange chamber 60 from the bypass inlet hole 65. A sub exhaust passage R <b> 2 that is introduced into the space A between the exchange chamber 60 and the casing 50 and is sent from the bypass outlet hole 74 to the exhaust duct 9 is formed. That is, the exhaust passage is divided into the main exhaust passage R1 and the sub exhaust passage R2, and the location of the exhaust duct 9 provided with the bypass outlet hole 74 is the main exhaust passage R1 and the sub exhaust passage R2. The exhaust gas merging portion is configured.

  Therefore, the combustion exhaust gas sent to the rear part in the heat exchange chamber 60 through the exhaust inlet 63 is caused to flow forward along the exhaust guide plate 61 and pass through the latent heat exchanger 51, and then the exhaust guide plate 61. It is guided along the front part 611 to the lower exhaust outlet 64 and flows into the exhaust duct 9 through the exhaust outlet 64. At the same time, the combustion exhaust guided upward through the latent heat exchanger 51 is guided to the space A between the heat exchange chamber 60 and the casing 50 through the bypass inlet hole 65, and the ceiling plate of the casing 50. 505 and the front plate 501 are guided downward and flow into the exhaust duct 9 through the bypass outlet hole 74 provided in the exhaust rectification upper plate 7.

  Thus, in the secondary heat exchange chamber 5, the exhaust passage of combustion exhaust is divided into two passages, the main exhaust passage R1 and the sub exhaust passage R2, and the main exhaust passage R1 and the sub exhaust passage R2 are joined by the exhaust duct 9. With this configuration, the noise transmitted separately to the main exhaust passage R1 and the sub exhaust passage R2 can be made to interfere with each other at the exhaust confluence of the exhaust duct 9 provided with the bypass outlet hole 74 and cancel each other. . That is, the phase of the noise wavelength is provided by the exhaust passages R1 and R2, and the noise is canceled by causing the noise wavelengths to interfere with each other at the exhaust merging portion of the exhaust duct 9. Therefore, noises such as burner combustion noise and exhaust noise can be canceled and noise leaking from the exhaust port 53 to the outside of the appliance can be reduced. The experimental machine was particularly effective for reducing the noise value on the low frequency side (100 Hz).

  On the other hand, in the latent heat exchanger 51, when the latent heat is absorbed from the combustion exhaust, water vapor in the combustion exhaust is condensed to generate strongly acidic drain on the latent heat exchanger 51. Most of this drain is dripped onto the lower drain guide plate 62, flows forward along the inclination of the drain guide plate 62, and is collected in the drain receiving portion 11 through the slit 83 of the lower plate 8 for exhaust rectification. After being collected in the drain neutralizer 13 through the drain discharge pipe 12 and neutralized, it is drained to sewage outside the instrument.

  However, part of the drain adhering to the latent heat exchanger 51 may get into the combustion exhaust and enter the space A between the heat exchange chamber 60 and the casing 50 from the bypass inlet hole 65. In addition, the combustion exhaust introduced into the space A from the bypass inlet hole 65 may be cooled by the ceiling plate 505 and the front plate 501, so that drain may be generated in the space A. Even in such a case, the front plate 501 on both the left and right sides of the exhaust port 53 stands in front of each bypass outlet hole 74 to form a cover portion K. Therefore, the bypass outlet hole 74 enters the exhaust duct 9. Even if drain is entrained in the discharged exhaust gas, the drain falls on the front plate 501 portions (cover portions K) on both the left and right sides of the exhaust port 53 and is scattered from the exhaust port 53 to the outside of the instrument. Can be prevented.

  From the above, according to the latent heat recovery type water heater 1 according to the present embodiment, it is possible to reduce noise leaking to the outside without scattering the drain from the exhaust port 53. Further, since the bypass inlet hole 65 is formed in front of the bent front portion of the exhaust guide plate 61 so as to be disposed as much as possible on the exhaust downstream side of the heat exchange chamber 60, the bypass inlet hole 65 is not subjected to heat exchange. The ratio of the combustion exhaust gas flowing out from the fuel can be reduced, and the thermal efficiency is not lowered.

  In addition, by arranging the exhaust duct 9 so as to be inclined upward, it is possible to suppress the noise transmitted from the exhaust outlet 64 from leaking out of the instrument from the open end of the exhaust top 54. In addition, the extension passage 55 following the exhaust duct 9 of the exhaust top 54 is also inclined in an upward slope, so that the flow of combustion exhaust to the open end of the exhaust top 54 becomes smoother, and noise leaking outside the instrument is further suppressed. The Further, since the exhaust duct 9 has a predetermined inclination angle of the exhaust rectification upper plate 7 and the exhaust rectification lower plate 8 so that the downstream end is narrower than the upstream end, noise leaks outside the appliance. Can be suppressed. Furthermore, noise can be prevented from leaking outside the appliance by forming the exhaust port 53 to be narrower than the outlet 91 of the exhaust duct 9.

  Further, the lower end of the front portion 611 of the exhaust guide plate 61 is disposed in a non-contact state in the flange 73 of the exhaust rectification upper plate 7. Accordingly, the drain adhering to the inner surface of the exhaust guide plate 61 is dropped into the flange 73 from the lower end of the front portion 611 of the exhaust guide plate 61 and is accumulated in the flange 73. Therefore, the drain adhering to the inner surface of the exhaust guide plate 61 is prevented from being caught in the combustion exhaust flowing into the exhaust duct 9 from the exhaust outlet 64 and being scattered outside the instrument.

  The length in the width direction of the exhaust rectification upper plate 7 is set such that a slight gap is formed between the left side plate 503 and the right side plate 504 of the casing 50 at both ends. Both end portions in the width direction of the plate 8 are set to have a length in close contact with the left side plate 503 and the right side plate 504. Therefore, when the drain accumulated in the flange 73 reaches the clearance between both ends, the drain flows down on the lower exhaust flow straightening lower plate 8 through the left side plate 503 and the right side plate 504 of the casing 50.

  Further, since the exhaust duct 9 is disposed so as to be inclined upward from the exhaust outlet 64, the exhaust rectifying lower plate 8 is not standing against the combustion exhaust flowing into the exhaust duct 9 from the exhaust outlet 64. It becomes. Therefore, even if the drain is caught in the combustion exhaust flowing into the exhaust duct 9 from the exhaust outlet 64, the drain can be prevented from being dropped by the lower plate 8 for exhaust rectification and scattered from the exhaust port 53. . Moreover, since the extension passage 55 of the exhaust top 54 is extended from the exhaust port 53, it is possible to more reliably prevent the drain from being scattered outside the instrument.

  The exhaust rectification lower plate 8 has a first inclined plate portion 82 formed in a downward gradient and a second inclined plate portion 81 formed in an upward gradient, and a plurality of slits 83 at the front end of the first inclined plate portion 82. Is formed. Accordingly, the drain that has flowed onto the exhaust rectification lower plate 8 flows into the drain receiving portion 11 through the slit 83. In this way, the drain generated in the heat exchange chamber 60 is collected in the drain receiver 11 and is prevented from being scattered from the exhaust port 53 to the outside of the instrument.

In addition, this invention is not limited only to the said embodiment, A various design change is possible within the scope of the present invention.
For example, as shown in FIG. 5, the bypass outlet hole 74 is formed by notching the left and right end portions of the exhaust rectifying upper plate 7, and covering the notch piece vertically to the front plate 501 side. The portion K ′ may be configured.

It is sectional drawing which shows the whole structure of the latent-heat-recovery type water heater by embodiment. It is an expanded sectional view expanding and showing a portion of a secondary heat exchange room in a latent heat recovery type water heater by an embodiment. It is a front view which shows the part of the secondary heat exchange chamber in the latent-heat-recovery type water heater by embodiment. It is a perspective view which shows typically the internal structure of the secondary heat exchange chamber in the latent-heat-recovery type water heater by embodiment. It is a perspective view which shows typically the internal structure of the secondary heat exchange chamber in the latent-heat-recovery type water heater by other embodiment. It is sectional drawing which shows the structure of the conventional water heater in which the countermeasure against noise was taken. It is sectional drawing which shows the structure of the conventional water heater in which the other noise countermeasure was taken.

Explanation of symbols

1 Latent heat recovery type water heater (heat source machine)
4 Primary heat exchange chamber 5 Secondary heat exchange chamber 7 Exhaust rectification upper plate 8 Exhaust rectification lower plate 9 Exhaust duct 41 Sensible heat exchanger 50 Casing 51 Latent heat exchanger 53 Exhaust port 60 Heat exchange chamber 61 Exhaust guide plate 62 Drain guide plate 63 Exhaust inlet 64 Exhaust outlet 65 Bypass inlet hole 71 Inclined plate portion 74 Bypass outlet hole 501 Front plate A Space K Cover portion R1 Main exhaust passage R2 Sub exhaust passage

Claims (3)

Latent heat in which a secondary heat exchange chamber equipped with a latent heat exchanger that absorbs latent heat from the combustion exhaust is disposed downstream of the primary heat exchange chamber equipped with a sensible heat exchanger that absorbs sensible heat from the combustion exhaust. In the recovery heat source machine,
The secondary heat exchange chamber
A casing that is formed in a box and has an exhaust port that opens combustion exhaust to the outside of the instrument on its front plate;
The exhaust heat guide plate attached to the upper region in the casing and the drain guide plate attached to the lower region in the casing surround the upper and lower sides of the latent heat exchanger, and the primary heat exchange at the rear of the drain guide plate An exhaust inlet for allowing combustion exhaust from the chamber to flow in, and a heat exchange chamber in which an exhaust outlet for discharging combustion exhaust is formed by an opening between the exhaust guide plate and the front end of the drain guide plate;
Upper and lower walls are formed by an exhaust rectification upper plate and an exhaust rectification lower plate that are inclined upwardly from the exhaust outlet to the exhaust outlet, and combustion exhaust in the heat exchange chamber is exhausted from the exhaust outlet to the exhaust outlet. An exhaust duct that forms a main exhaust passage that flows to the mouth,
The exhaust guide plate that forms the heat exchange chamber is provided with a bypass inlet hole, and the exhaust rectification upper plate that forms the exhaust duct is provided with a bypass outlet hole so that the combustion exhaust in the heat exchange chamber is bypassed by the bypass. A sub exhaust passage is formed that flows from the inlet hole through the space between the heat exchange chamber and the casing into the exhaust duct from the bypass outlet hole,
A latent heat recovery type heat source machine , wherein a cover portion having a size such that the bypass outlet hole is hidden from the exhaust port is formed inside the exhaust duct or outside the exhaust duct in front of the bypass outlet hole . In the latent heat recovery type heat source machine according to claim 1,
The exhaust port dimension is formed smaller than the outlet dimension of the exhaust duct,
The bypass outlet holes are formed on the left and right sides of the upper plate for exhaust rectification by cutting out both front corners of the inclined plate portion that is inclined upwardly from the exhaust outlet to the exhaust outlet, The bypass outlet hole is a latent heat recovery type heat source machine that is set to a size that is concealed by front plate portions on both the left and right sides of the exhaust port serving as the cover portion formed outside the exhaust duct . In the latent heat recovery type heat source machine according to claim 1 or 2,
The bypass inlet hole is a latent heat recovery type heat source device disposed on the exhaust downstream side in the heat exchange chamber.

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