Heat source device

Abstract

To provide a heat source device capable of dispensing with a costly drain discharge pipe, and capable of enhancing reliability and safety of drain discharge.SOLUTION: A water heater 1 includes a sensible heat exchanger 32 absorbing sensible heat from combustion exhaust of a burner 20, a latent heat exchanger 34 disposed in a combustion exhaust downstream side of the sensible heat exchanger 32 and absorbing latent heat from the combustion exhaust after passing through the sensible heat exchanger 32, an exhaust port 22a for discharging the combustion exhaust to the outside, a fan 14 supplying combustion air to the burner 20 and sending the combustion exhaust from the burner 20 to the exhaust port 22a through the sensible heat exchanger 32 and the latent heat exchanger 34, a drain receiving tray 76 for receiving drain 82 generated by condensation in the latent heat exchanger 34, and an air-permeable water absorption member 86 immersed in the drain 82 received by the drain receiving tray 76 and having a large number of fine pores.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a heat source device.

Background Art

[0002] Patent Document 1 discloses an example of a conventional heat source device. This heat source device includes a burner, a sensible heat exchanger, a latent heat exchanger, an exhaust port, a fan, and a drain receiver.

[0003] The burner burns fuel. The sensible heat exchanger absorbs sensible heat from the combustion exhaust of the burner. The latent heat exchanger is disposed on the downstream side of the combustion exhaust of the sensible heat exchanger and absorbs latent heat from the combustion exhaust after passing through the sensible heat exchanger. The exhaust port discharges the combustion exhaust after passing through the latent heat exchanger to the outside of the device. The fan supplies combustion air to the burner and sends the combustion exhaust from the burner to the exhaust port through an exhaust passage in which the sensible heat exchanger and the latent heat exchanger are arranged in sequence. The drain receiver receives the drain generated by condensation in the latent heat exchanger.

[0004] Also, in this heat source device, the drain receiver is disposed in an air chamber. An air passage is connected to the air chamber via a nozzle, and a drain discharge port different from the exhaust port of the combustion exhaust is provided. The air passage is provided in parallel with the exhaust passage, and air not containing combustion exhaust is directly supplied from the fan to the air passage. The drain received by the drain receiver evaporates by contact with the air from the air passage ejected from the nozzle, becomes drain vapor, and is discharged to the outside of the device from the drain discharge port.

[0005] In this heat source system, for example, a water supply pipe is connected to a latent heat exchanger, and a hot water supply pipe is connected to a sensible heat exchanger. This allows the water in the water supply pipe to be heated in the latent heat exchanger, and the water heated in the latent heat exchanger to be further heated in the sensible heat exchanger before being supplied to the hot water supply pipe. Furthermore, by recovering latent heat from the combustion exhaust after it has passed through the sensible heat exchanger, heat can be recycled, reducing fuel consumption. Therefore, this heat source system can achieve high thermal efficiency and low CO2 emissions. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Japanese Patent Publication No. 2005-61792 [Overview of the Initiative] [Problems that the invention aims to solve]

[0007] The conventional heat source system described above eliminates the need for drain pipes, which incur additional construction costs. However, this conventional heat source system evaporates condensate using air that is considerably colder than the combustion exhaust. As a result, there is a risk that condensate evaporation may be insufficient, and the evaporation rate may not keep up with the rate at which condensate is generated.

[0008] Furthermore, in the conventional heat source devices described above, the condensate steam is discharged directly to the outside of the device through the drain outlet. Therefore, there are safety concerns regarding the exhaust from these conventional heat source devices.

[0009] This invention has been made in view of the above-mentioned conventional circumstances, and aims to solve the problem of providing a heat source device that does not require costly drain pipes and can improve the reliability and safety of drain discharge. [Means for solving the problem]

[0010] The heat source device of the present invention comprises a burner for burning fuel, A sensible heat exchanger that absorbs sensible heat from the combustion exhaust of the burner, A latent heat exchanger is positioned downstream of the combustion exhaust of the sensible heat exchanger and absorbs latent heat from the combustion exhaust after it has passed through the sensible heat exchanger. An exhaust port for discharging combustion exhaust gas to the outside after it has passed through the latent heat exchanger, A fan supplies combustion air to the burner and sends the combustion exhaust from the burner through the sensible heat exchanger and the latent heat exchanger to the exhaust port. In a heat source device comprising a drain receiving section for receiving condensate generated by condensation in the latent heat exchanger, It is characterized by being positioned downstream of the combustion exhaust of the latent heat exchanger, being immersed in the drain received by the drain receiving section, and having a large number of pores, and comprising a breathable water-absorbing member.

[0011] In the heat source device of the present invention, the exhaust gas from the burner is sent to the exhaust port via a sensible heat exchanger and a latent heat exchanger in sequence, by the airflow force of a fan that supplies combustion air to the burner.

[0012] The condensate generated by condensation in the latent heat exchanger and collected in the drain collection section is immersed in a permeable water-absorbing member located downstream of the combustion exhaust of the latent heat exchanger. As a result, the condensate is absorbed by the permeable water-absorbing member. The combustion exhaust that has passed through the latent heat exchanger flows through this permeable water-absorbing member. Therefore, the condensate absorbed by the permeable water-absorbing member can be heated by the high-temperature combustion exhaust and evaporated efficiently.

[0013] Furthermore, since the condensate absorbed by the breathable water-absorbing material resides within numerous pores, the contact area between the condensate and the combustion exhaust is increased. As a result, the evaporation of the condensate is promoted.

[0014] The condensate generated within the permeable water-absorbing material is then reliably mixed with the combustion exhaust passing through the material. As a result, the mixture of condensate and combustion exhaust flows out of the permeable water-absorbing material and is discharged to the outside of the device through the exhaust port. Therefore, the condensate is not discharged directly to the outside of the device, minimizing safety concerns.

[0015] Furthermore, the exhaust components discharged from the exhaust port of the heat source device of the present invention are the same as those of a sensible heat recovery type heat source device that does not have a latent heat exchanger and only has a sensible heat exchanger; therefore, safety is also guaranteed in this respect.

[0016] Therefore, the heat source device of the present invention eliminates the need for costly drain pipes and can improve the reliability and safety of drain discharge.

[0017] It is preferable that a guide section is provided upstream of the combustion exhaust of the permeable water-absorbing member to guide the combustion exhaust, after it has passed through the latent heat exchanger, to the permeable water-absorbing member. It is preferable that this guide section has a constricted section at the downstream end of the combustion exhaust where the flow path cross-sectional area is narrowed. It is preferable that the permeable water-absorbing member is positioned adjacent to the constricted section.

[0018] In this case, the pressure of the combustion exhaust decreases in the constricted section where the flow path cross-sectional area is narrowed in the guide section, so the location of the permeable water-absorbing member becomes a low-pressure environment. As a result, the boiling point of the drain in the permeable water-absorbing member is lowered, and the evaporation of the drain is further promoted.

[0019] The permeable water-absorbing member preferably has an integral flow section forming section on the upstream side of the combustion exhaust, through which multiple flow sections are formed for the combustion exhaust that has passed through the latent heat exchanger. Preferably, the flow section has an internal throttling section at the downstream end of the combustion exhaust in the flow section, where the flow path cross-sectional area is narrowed.

[0020] In this case, in the flow path section, the pressure of the combustion exhaust gas decreases at the internal throttle section where the flow path cross-sectional area is narrowed, so the location where the breathable water absorption member is arranged becomes a low pressure area. As a result, the boiling point of the drain in the breathable water absorption member decreases, and the evaporation of the drain is further promoted.

Advantages of the Invention

[0021] The heat source device of the present invention does not require a costly drain drain pipe, and can enhance the certainty and safety of drain discharge.

Brief Description of the Drawings

[0022] [Figure 1] FIG. 1 is a schematic configuration diagram of the water supply device of Example 1. [Figure 2] FIG. 2 is a schematic configuration diagram of the water supply device of Example 2. [[ID=第十九]] [Figure 3] FIG. 3 is a schematic cross-sectional view of the breathable water absorption member related to the water supply device of Example 3.

Modes for Carrying Out the Invention

[0023] Hereinafter, Examples 1 to 3 embodying the present invention will be described while referring to the drawings.

[0024] (Example 1) The water supply device 1 of Example 1 is an example of a specific embodiment of the heat source device of the present invention. FIG. 1 is a schematic configuration diagram of the water supply device 1 viewed from the front. The front side of the paper surface of FIG. 1 is defined as the front of the water supply device 1, the left side of the paper surface of FIG. 1 is defined as the left side of the water supply device 1, and the upper side of the paper surface of FIG. 1 is defined as the upper side of the water supply device 1.

[0025] [Housing] As shown in FIG. 1, the water supply device 1 includes a housing 10. The housing 10 partitions a substantially rectangular parallelepiped-shaped internal space.

[0026] [Cylinder body and fan] The water supply device 1 includes a cylinder body 12 and a fan 14.

[0027] The boiler body 12 is located at the top of the casing 10. Inside the boiler body 12, there is a combustion chamber 16 and an exhaust passage 18 extending above the combustion chamber 16. A burner 20 is located in the combustion chamber 16.

[0028] An exhaust pipe 22 is provided at the upper end of the left side wall of the boiler body 12, protruding to the left from the boiler body 12. One end of the exhaust pipe 22 is in communication with the exhaust passage 18. The other end of the exhaust pipe 22, the exhaust port 22a, penetrates the left side wall of the housing 10 and is exposed to the outside of the housing 10. Combustion exhaust from the burner 20 is discharged to the outside from the combustion chamber 16 through the exhaust passage 18, the exhaust pipe 22, and the exhaust port 22a.

[0029] The fan 14 is located inside the housing 10, below the boiler body 12. The fan 14 supplies combustion air to the burner 20 in the combustion chamber 16. The fan 14 also causes the combustion exhaust from the burner 20 to rise inside the boiler body 12 and sends it sequentially through the combustion chamber 16, exhaust passage 18, and exhaust pipe 22 to the exhaust port 22a.

[0030] One end of a gas supply pipe 24 is connected to the burner 20. The other end of the gas supply pipe 24 is connected to a gas supply source (not shown) located outside the housing 10. A main gas solenoid valve 26, a gas proportional valve 28, and a gas solenoid valve 30 are arranged in this order on the gas supply pipe 24. As a result, fuel gas such as city gas or propane gas is supplied to the burner 20 from the external gas supply source via the main gas solenoid valve 26, the gas proportional valve 28, and the gas solenoid valve 30.

[0031] The main gas solenoid valve 26 controls the supply and cessation of fuel gas to the burner 20. The gas proportional valve 28 controls the amount of fuel gas supplied to the burner 20 by its valve opening. The gas solenoid valve 30 controls the supply and cessation of fuel gas to the burner 20. The burner 20 discharges the fuel gas from the flame port and burns it. As a result, the burner 20 generates high-temperature combustion exhaust.

[0032] <Sensible heat exchangers and latent heat exchangers> The hot water supply system 1 is equipped with a sensible heat exchanger 32 and a latent heat exchanger 34. The sensible heat exchanger 32 and the latent heat exchanger 34 are housed in the exhaust passage 18 in the upper part of the boiler body 12. The sensible heat exchanger 32 is located above the burner 20 and is positioned in the lower part of the exhaust passage 18. The latent heat exchanger 34 is located above the sensible heat exchanger 32 and is positioned in the upper part of the exhaust passage 18. The sensible heat exchanger 32 and the latent heat exchanger 34 extend almost the entire length of the boiler body 12 in the left-right direction of the hot water supply system 1.

[0033] The high-temperature combustion exhaust generated by the burner 20 rises from the combustion chamber 16 and flows into the exhaust passage 18, and while rising within the exhaust passage 18, it flows toward the exhaust pipe 22. That is, the combustion exhaust from the burner 20 rises within the exhaust passage 18 while passing sequentially through the sensible heat exchanger 32 and the latent heat exchanger 34. The combustion exhaust is cooled by heat exchange in the sensible heat exchanger 32, and then further cooled by heat exchange in the latent heat exchanger 34 before being discharged to the outside of the housing 10 from the exhaust port 22a of the exhaust pipe 22.

[0034] The sensible heat exchanger 32 has heat transfer tubes 36. The heat transfer tubes 36 meander, including multiple straight sections and multiple folded sections that are folded in an arc shape to connect the straight sections. Each straight section of the heat transfer tubes 36 has multiple heat transfer fins.

[0035] The sensible heat exchanger 32 performs heat exchange between the water flowing through the heat transfer tubes 36 and the high-temperature combustion exhaust generated by the burner 20, and absorbs the sensible heat of the combustion exhaust.

[0036] The latent heat exchanger 34 has heat transfer tubes 38. The heat transfer tubes 38 are corrugated tubes that meander, including multiple straight sections and multiple folded sections that are folded in an arc shape to connect the straight sections.

[0037] The latent heat exchanger 34 exchanges heat between the water flowing through the heat transfer tubes 38 and the high-temperature combustion exhaust generated by the burner 20, which has passed through the sensible heat exchanger 32, thereby cooling the combustion exhaust to below the dew point temperature and absorbing its latent heat.

[0038] In this way, the sensible heat exchanger 32 and the latent heat exchanger 34 each heat the water passing through them with high-temperature combustion exhaust, converting it into hot water.

[0039] <Water supply pipes, connecting pipes, hot water pipes, and bypass pipes> The hot water supply system 1 includes a water supply pipe 40, a connecting pipe 42, a hot water supply pipe 44, and a bypass pipe 46. The water supply pipe 40, the connecting pipe 42, the hot water supply pipe 44, and the bypass pipe 46 are housed within the casing 10.

[0040] The upstream end of the water supply pipe 40 is connected to a water supply connection member 56, which will be described later. The downstream end of the water supply pipe 40 is located above the upstream end of the water supply pipe 40 and is connected to the inlet of the heat transfer tube 38 of the latent heat exchanger 34.

[0041] The upstream end of the connecting pipe 42 is connected to the outlet of the heat transfer tube 38 of the latent heat exchanger 34. The downstream end of the connecting pipe 42 is located below the upstream end of the connecting pipe 42 and is connected to the inlet of the heat transfer tube 36 of the sensible heat exchanger 32.

[0042] A hot water high-limit switch 48 is provided near the inlet of the heat transfer tube 36 of the sensible heat exchanger 32 in the connecting pipe 42. The hot water high-limit switch 48 detects overheating of the sensible heat exchanger 32.

[0043] The upstream end of the hot water supply pipe 44 is connected to the outlet of the heat transfer tube 36 of the sensible heat exchanger 32. The downstream end of the hot water supply pipe 44 is located below the upstream end of the hot water supply pipe 44 and is connected to the hot water supply connection member 58, which will be described later.

[0044] A heat exchanger outlet thermistor 52 is provided near the outlet of the heat transfer tube 36 of the sensible heat exchanger 32 in the hot water supply pipe 44. The heat exchanger outlet thermistor 52 detects the temperature of the hot water flowing from the sensible heat exchanger 32 into the hot water supply pipe 44. A hot water thermistor 54 is provided downstream of the point where the hot water supply pipe 44 merges with the bypass pipe 46 near the hot water supply connection member 58, which will be described later. The hot water thermistor 54 detects the temperature of the hot water sent from the hot water supply pipe 44 to the external hot water supply line 66, which will be described later.

[0045] The upstream end of the bypass pipe 46 is connected to the water supply pipe 40. The downstream end of the bypass pipe 46 is connected to the hot water supply pipe 44. A bypass servo 74 of the water volume control unit 60, which will be described later, is provided at the connection point between the water supply pipe 40 and the bypass pipe 46.

[0046] <Water supply connection member, hot water connection member, and water volume control unit> The hot water supply device 1 includes a water supply connection member 56, a hot water supply connection member 58, and a water volume control unit 60.

[0047] The water supply connection member 56 is connected to a water supply channel 62 located outside the housing 10. The water supply connection member 56 has a water filter and drain plug 64.

[0048] The hot water supply connection member 58 is connected to the hot water supply passage 66 located outside the housing 10. The hot water supply connection member 58 has an overpressure relief valve / drain valve 68 that operates to release pressure when the pressure inside the hot water supply pipe 44 becomes excessive.

[0049] The water flow control unit 60 is located near the water supply connection member 56 in the water supply pipe 40. The water flow control unit 60 includes a water flow sensor 70, a water flow servo 72, and a bypass servo 74. The water flow control unit 60 controls the flow rate of water flowing through the water supply pipe 40 and the bypass pipe 46.

[0050] The water flow sensor 70 detects the flow rate of water flowing through the water supply pipe 40. The water flow servo 72 adjusts the flow rate of water flowing through the water supply pipe 40. The bypass servo 74 adjusts the ratio of the flow rate of water sent to the latent heat exchanger 34 via the water supply pipe 40 to the flow rate of water sent from the water supply pipe 40 to the bypass pipe 46 by adjusting the degree of opening to the bypass pipe 46. The bypass servo 74 also switches between a bypass closed state, which directs the water supplied to the water flow control unit 60 only to the water supply pipe 40, and a bypass open state, which directs the water supplied to the water flow control unit 60 to both the water supply pipe 40 and the bypass pipe 46. The water flow servo 72 controls the total flow rate of hot water sent from the hot water supply pipe 44 to the external hot water supply line 66.

[0051] <Drain receiving section and breathable absorbent material> The hot water supply device 1 is equipped with a drain pan 76 that receives the drain 82 generated by condensation in the latent heat exchanger 34. The drain pan 76 is an example of a drain receiving part of the present invention.

[0052] The drain pan 76 is located within the exhaust passage 18, between the sensible heat exchanger 32 and the latent heat exchanger 34, and below the latent heat exchanger 34. The drain pan 76 is positioned within the combustion exhaust flow caused by the airflow of the fan 14. The drain pan 76 extends in the left-right and front-back directions of the hot water supply unit 1 to a length approximately equal to that of the latent heat exchanger 34.

[0053] The upper surface of the bottom wall 78 of the drain pan 76 is an inclined surface that slopes downward toward the downstream side of the combustion exhaust, that is, from the right to the left of the housing 10. As a result, a drain reservoir 84 is formed on the left end side of the bottom wall 78 of the drain pan 76, where the drain 82 accumulates.

[0054] The hot water supply device 1 is equipped with a breathable absorbent member 86. The breathable absorbent member 86 is located within the exhaust passage 18, downstream of the combustion exhaust of the latent heat exchanger 34, and adjacent to the latent heat exchanger 34. The breathable absorbent member 86 is sized to block the exhaust passage 18. The breathable absorbent member 86 is located in the drain reservoir 84 of the drain pan 76. When drain 82 accumulates in the drain reservoir 84, the lower end of the breathable absorbent member 86 is immersed in the drain 82.

[0055] The permeable absorbent member 86 is made of a porous resin material that has heat resistance and acid resistance to combustion exhaust. The permeable absorbent member 86 has a converging pore structure with numerous fine pores so that it can absorb the drain 82 by capillary action when immersed in the drain 82, and also allow combustion exhaust to flow through it.

[0056] The permeable absorbent member 86 is immersed in the drain 82 and absorbs the drain 82. As the combustion exhaust, after passing through the latent heat exchanger 34, flows through the permeable absorbent member 86, the drain 82 absorbed by the permeable absorbent member 86 is heated by the combustion exhaust and evaporates.

[0057] <Hot water supply operation> When the hot water heater 1 supplies hot water to the external hot water supply line 66, the fan 14 is activated to supply combustion air to the burner 20, and fuel gas is supplied to the burner 20 from an external gas supply source to burn the fuel gas. At this time, the water supplied from the external water supply source to the water supply line 62 is sent to the latent heat exchanger 34 via the water supply pipe 40. This water is heated by heat exchange in the latent heat exchanger 34, and then further heated by heat exchange in the sensible heat exchanger 32 to become high-temperature hot water. This hot water is supplied to the external hot water supply line 66 via the hot water supply pipe 44. At this time, the high-temperature hot water flowing from the sensible heat exchanger 32 into the hot water supply pipe 44 and the low-temperature water flowing from the water supply pipe 40 into the hot water supply pipe 44 via the bypass pipe 46 are mixed to adjust the temperature of the hot water supplied to the hot water supply line 66. By adjusting the combustion rate of the burner 20 and the opening degree of the bypass servo 74 to the bypass pipe 46, the temperature of the hot water supplied to the hot water supply line 66 can be adjusted to a desired temperature.

[0058] <Effects and Effects> In the hot water supply device 1 of Example 1, the exhaust gas from the burner 20 is blown by the fan 14 that supplies combustion air to the burner 20, flowing from the combustion chamber 16 through the exhaust passage 18, passing sequentially through the sensible heat exchanger 32 and the latent heat exchanger 34 before being sent to the exhaust pipe 22.

[0059] The lower end of a permeable absorbent member 86, positioned downstream of the combustion exhaust of the latent heat exchanger 34, is immersed in the drain 82 generated by condensation in the latent heat exchanger 34 and collected in the drain pan 76. As a result, the drain 82 is absorbed by the permeable absorbent member 86. Combustion exhaust that has passed through the latent heat exchanger 34 flows through this permeable absorbent member 86. Therefore, the drain 82 absorbed by the permeable absorbent member 86 can be heated by the high-temperature combustion exhaust and efficiently evaporated.

[0060] Furthermore, since the drain 82 absorbed by the breathable water-absorbing member 86 is located within numerous pores, the contact area between the drain 82 and the combustion exhaust is increased. As a result, the evaporation of the drain 82 is promoted.

[0061] The condensate generated within the permeable water-absorbing member 86 is then reliably mixed with the combustion exhaust passing through the permeable water-absorbing member 86. As a result, the mixed gas of condensate and combustion exhaust flows out of the permeable water-absorbing member 86 and is discharged to the outside of the hot water supply device 1 through the exhaust pipe 22 and exhaust port 22a. Therefore, the condensate is not discharged directly to the outside of the hot water supply device 1, minimizing safety concerns.

[0062] Furthermore, the exhaust components discharged from the exhaust port 22a of this heat source device 1 are the same as those of a sensible heat recovery type heat source device that does not have a latent heat exchanger and only has a sensible heat exchanger, thus ensuring safety in this respect as well.

[0063] Therefore, the hot water supply device 1 of Example 1 does not require a costly drain pipe, and can improve the reliability and safety of drain discharge.

[0064] In this hot water heater 1, the drain 82 collected in the drain pan 76 is immediately absorbed by the breathable absorbent member 86 in the drain reservoir 84, and is heated by the combustion exhaust passing through the breathable absorbent member 86, causing it to evaporate rapidly. As a result, the amount of drain 82 stored in the drain pan 76 can be reduced. Therefore, this hot water heater 1 can easily handle situations where a large amount of drain 82 is generated.

[0065] Furthermore, since the drain 82 that accumulates in the drain pan 76 is not neutralized, the growth of Legionella bacteria can be suppressed.

[0066] (Example 2) The hot water supply device 2 of Example 2 is provided with a guide section and a throttling section in the exhaust passage 18 related to the hot water supply device 1 of Example 1.

[0067] As shown in Figure 2, the hot water supply device 2 includes a guide section 88 and a throttling section 90. The guide section 88 guides the combustion exhaust after it has passed through the latent heat exchanger 34 to the permeable absorbent member 86. The guide section 88 is formed by arranging a plate material 88a in the exhaust passage 18 such that the flow path cross-sectional area of ​​the exhaust passage 18 gradually narrows toward the downstream side of the combustion exhaust. In Embodiment 2, the downstream end of the combustion exhaust in the guide section 88 is the throttling section 90, where the flow path cross-sectional area is narrowest. The permeable absorbent member 86 is arranged adjacent to the throttling section 90.

[0068] Furthermore, the throttling section 90 is not limited to the downstream end of the combustion exhaust of the guide section 88, but may also be provided in an intermediate part of the guide section 88.

[0069] In the hot water supply device 2 of Example 2, the pressure of the combustion exhaust decreases in the constricted section 90 where the flow path cross-sectional area is narrowed in the guide section 88. As a result, the permeable absorbent member 86 placed in this constricted section 90 is in a low-pressure environment. This lowers the boiling point of the drain 82 in the permeable absorbent member 86, and the evaporation of the drain 82 is further promoted.

[0070] The other configurations and effects of Example 2 are the same as those of Example 1.

[0071] (Example 3) The hot water supply system of Example 3 is a modified version of the hot water supply system 1 of Example 1, with a modified configuration of the breathable absorbent member 86.

[0072] As shown in Figure 3, the permeable absorbing member 86 of the hot water supply device of Embodiment 3 integrally has a flow-through section forming section 92 on the upstream side of the combustion exhaust.

[0073] The flow section forming section 92 has a number of first flow sections 94a and second flow sections 94b formed therein for circulating combustion exhaust. The first flow sections 94a and second flow sections 94b are formed alternately in the longitudinal direction of the flow section forming section 92. The flow path cross-sectional area of ​​each first flow section 94a is narrowed toward the downstream side of the combustion exhaust. The downstream end of the combustion exhaust in each first flow section 94a is an internal throttling section 96 where the flow path cross-sectional area is narrowest. The flow path cross-sectional area of ​​each second flow section 94b is widened toward the downstream side of the combustion exhaust.

[0074] The breathable absorbent member 86 also integrally has a flow-forming portion 92 on the downstream side of the combustion exhaust.

[0075] The flow-forming section 92 is made of a resin material. The flow-forming section 92 is formed by resin molding and is integrated with the breathable absorbent member 86 by heat welding or adhesive bonding.

[0076] In the hot water supply device of Example 3, a flow section forming section 92, which has a large number of first flow sections 94a formed thereon, is integrated with the combustion exhaust upstream side of the permeable absorbent member 86. At the downstream end of the combustion exhaust of the large number of first flow sections 94a, an internal throttling section 96 is formed, in which the flow path cross-sectional area is narrowest. As a result, the permeable absorbent member 86 is adjacent to the large number of internal throttling sections 96. Since the pressure of the combustion exhaust decreases in these internal throttling sections 96, the area where the permeable water-absorbing member 86 is located becomes low pressure. This lowers the boiling point of the drain 82 in the permeable water-absorbing member 86, and the evaporation of the drain 82 is further promoted.

[0077] In this hot water supply system, evaporation of the drain 82 can be further promoted without providing a guide section 88 in the exhaust passage 18, thus simplifying the structure compared to Example 2.

[0078] Although the present invention has been described above in reference to Examples 1 to 3, it goes without saying that the present invention is not limited to Examples 1 to 3, and can be applied with appropriate modifications without departing from its spirit.

[0079] For example, in Examples 1 to 3, a porous resin material was used for the breathable absorbent member 86, but the present invention is not limited to this, and porous materials such as paper, metal, or ceramics may also be used. [Industrial applicability]

[0080] The present invention can be used, for example, in heat source devices such as a hot water supply device having only a hot water supply function, a hot water supply device having a hot water supply function and a bath reheating function, and a hot water heater having a hot water supply function and a heating function that circulates hot water between the hot water supply device and a heating device. [Explanation of Symbols]

[0081] 1, 2... Hot water supply equipment (heat source equipment) 14…fan 20... Burner 22a... Exhaust port 32…Sensible heat exchanger 34...Latent heat exchanger 76... Drain pan (drain receiving section) 82... Drain 84... Drain reservoir 86... Breathable water-absorbing material 88…Information Department 90... Aperture section 92…Flow section forming section 94a…1st distribution department (distribution department) 96...Internal aperture section

Claims

1. A burner that burns fuel, A sensible heat exchanger that absorbs sensible heat from the combustion exhaust of the burner, A latent heat exchanger is positioned downstream of the combustion exhaust of the sensible heat exchanger and absorbs latent heat from the combustion exhaust after it has passed through the sensible heat exchanger. An exhaust port for discharging combustion exhaust gas to the outside after it has passed through the latent heat exchanger, A fan supplies combustion air to the burner and sends the combustion exhaust from the burner through the sensible heat exchanger and the latent heat exchanger to the exhaust port. In a heat source device comprising a drain receiving section for receiving condensate generated by condensation in the latent heat exchanger, It is positioned downstream of the combustion exhaust of the latent heat exchanger, is immersed in the drain received by the drain receiving section, and is equipped with a breathable water-absorbing member having numerous pores, A guide portion is provided on the upstream side of the permeable water-absorbing member for guiding the combustion exhaust, after it has passed through the latent heat exchanger, to the permeable water-absorbing member. The guide section has a constricted section in which the cross-sectional area of ​​the flow path is narrowed. The heat source device is characterized in that the breathable water-absorbing member is arranged in the constricted portion.

2. A burner for burning fuel, A sensible heat exchanger that absorbs sensible heat from the combustion exhaust of the burner, A latent heat exchanger is positioned downstream of the combustion exhaust of the sensible heat exchanger and absorbs latent heat from the combustion exhaust after it has passed through the sensible heat exchanger. An exhaust port for discharging combustion exhaust gas to the outside after it has passed through the latent heat exchanger, A fan supplies combustion air to the burner and sends the combustion exhaust from the burner through the sensible heat exchanger and the latent heat exchanger to the exhaust port. In a heat source device comprising a drain receiving section for receiving condensate generated by condensation in the latent heat exchanger, It is positioned downstream of the combustion exhaust of the latent heat exchanger, is immersed in the drain received by the drain receiving section, and is equipped with a breathable water-absorbing member having numerous pores, The aforementioned permeable water-absorbing member integrally has a flow section forming section on the upstream side of the combustion exhaust, which has a plurality of flow sections formed therein for the combustion exhaust that has passed through the latent heat exchanger to flow through, The heat source device is characterized in that the flow section has an internal throttling section at the downstream end of the combustion exhaust in the flow section, in which the cross-sectional area of ​​the flow path is narrowed.

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