JP2023170213A - heat source device - Google Patents

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

The present invention relates to a heat source device.

An example of a conventional heat source device is disclosed in Patent Document 1. This heat source device includes a burner, a sensible heat exchanger, a latent heat exchanger, an exhaust port, a fan, and a drain receiver.

Burners burn fuel. The sensible heat exchanger absorbs sensible heat from the combustion exhaust of the burner. The latent heat exchanger is disposed downstream of the combustion exhaust gas from the sensible heat exchanger, and absorbs latent heat from the combustion exhaust gas 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 combustion exhaust from the burner to the exhaust port through an exhaust passage in which a sensible heat exchanger and a latent heat exchanger are arranged in sequence. The drain receiver receives drain generated by condensation in the latent heat exchanger.

Further, in this heat source device, the drain receiving portion is arranged in the air chamber. The air chamber is connected to an air passage through a nozzle, and is provided with a drain outlet separate from the combustion exhaust outlet. The air passage is provided in parallel with the exhaust passage, and air not containing combustion exhaust is directly supplied to the air passage from the fan. The drain received by the drain receiver is evaporated by contact with air from the air passage ejected from the nozzle, and is turned into drain vapor and discharged to the outside of the device from the drain outlet.

In this heat source device, 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. Thereby, the water in the water supply pipe can be heated by the latent heat exchanger, and the water heated by the latent heat exchanger can be further heated by the sensible heat exchanger and then supplied to the hot water supply pipe. By recovering latent heat from the combustion exhaust gas that has passed through the sensible heat exchanger, heat can be recycled and fuel consumption can be reduced. Therefore, this heat source device can achieve high thermal efficiency and low CO ₂ emissions.

Japanese Patent Application Publication No. 2005-61792

According to the above-mentioned conventional heat source device, there is no need for a drain pipe that requires construction costs. However, in the conventional heat source device described above, condensate is evaporated using air that is considerably lower in temperature than the combustion exhaust gas. Therefore, there is a possibility that the evaporation of the condensate is insufficient and the evaporation of the condensate cannot keep up with the generation of the condensate.

Furthermore, in the conventional heat source device described above, drain steam is directly discharged from the drain outlet to the outside of the device. For this reason, there are safety concerns regarding the exhaust gas from the conventional heat source device.

The present invention has been made in view of the above-mentioned conventional situation, and an object of the present invention is to provide a heat source device that does not require an expensive drain drain pipe and can improve the reliability and safety of drain discharge. This is an issue that should be addressed.

The heat source device of the present invention includes a burner that burns fuel;
a sensible heat exchanger that absorbs sensible heat from the combustion exhaust of the burner;
a latent heat exchanger that is disposed downstream of the combustion exhaust of the sensible heat exchanger and absorbs latent heat from the combustion exhaust after passing through the sensible heat exchanger;
an exhaust port for discharging combustion exhaust gas to the outside after passing through the latent heat exchanger;
a fan that supplies combustion air to the burner and sends combustion exhaust from the burner to the exhaust port via the sensible heat exchanger and the latent heat exchanger;
A heat source device comprising a drain receiver for receiving drain generated by condensation in the latent heat exchanger,
The present invention is characterized in that it includes a breathable water-absorbing member that is disposed on the downstream side of the combustion exhaust of the latent heat exchanger, is immersed in the drain received by the drain receiver, and has a large number of pores.

In the heat source device of the present invention, combustion exhaust from the burner is sent to the exhaust port through the sensible heat exchanger and the latent heat heat exchanger in order by the blowing force of the fan that supplies combustion air to the burner.

A breathable water-absorbing member disposed on the downstream side of the combustion exhaust of the latent heat exchanger is immersed in the drain generated by condensation in the latent heat exchanger and received by the drain receiver. As a result, the drain water is absorbed by the breathable water absorbing member. Combustion exhaust gas after passing through the latent heat exchanger flows through this breathable water absorbing member. Therefore, the drain water absorbed by the breathable water-absorbing member can be heated with high-temperature combustion exhaust and efficiently evaporated.

Further, since the drain water absorbed by the breathable water absorbing member exists in a large number of pores, the contact area between the drain and combustion exhaust gas is increased. As a result, evaporation of the drain is promoted.

The drain vapor generated within the breathable water-absorbing member is reliably mixed with the combustion exhaust gas passing through the breathable water-absorbing member. As a result, a gas mixture of drain steam and combustion exhaust flows out of the breathable water-absorbing member and is discharged to the outside of the device from the exhaust port. Therefore, the drain steam is not directly discharged to the outside of the device, and there are few safety concerns.

Furthermore, the exhaust gas components discharged from the exhaust port of the heat source device of the present invention are similar to the exhaust gas components of a sensible heat recovery type heat source device that does not have a latent heat exchanger and only has a sensible heat exchanger. Safety is also guaranteed in this respect.

Therefore, the heat source device of the present invention does not require an expensive drain pipe, and can improve the reliability and safety of drain discharge.

It is preferable that a guide part is provided upstream of the breathable water-absorbing member for guiding the combustion exhaust gas after passing through the latent heat exchanger to the breathable water-absorbing member. It is preferable that this guide part has a constriction part with a narrowed flow path cross-sectional area at the downstream end of the combustion exhaust in the guide part. Preferably, the breathable water-absorbing member is disposed adjacent to the constriction portion.

In this case, the pressure of the combustion exhaust gas is reduced at the constriction section where the cross-sectional area of the flow path is narrowed in the guide section, so the location where the breathable water-absorbing member is arranged becomes a low-pressure environment. As a result, the boiling point of the condensate in the breathable water-absorbing member is lowered, and evaporation of the condensate is further promoted.

It is preferable that the breathable water-absorbing member integrally has a circulation part forming part on the upstream side of the combustion exhaust gas, in which a plurality of circulation parts are formed to circulate the combustion exhaust gas after passing through the latent heat exchanger. Preferably, this flow section has an internal constriction section with a narrowed cross-sectional area at the downstream end of the combustion exhaust in the flow section.

In this case, the pressure of the combustion exhaust gas is reduced at the internal constriction section where the cross-sectional area of the flow path is narrowed in the flow section, so the pressure at the location where the breathable water-absorbing member is arranged becomes low. As a result, the boiling point of the condensate in the breathable water-absorbing member is lowered, and evaporation of the condensate is further promoted.

The heat source device of the present invention does not require an expensive drain pipe, and can improve the reliability and safety of drain discharge.

FIG. 1 is a schematic configuration diagram of a water heater according to a first embodiment. FIG. 2 is a schematic configuration diagram of a water heater according to a second embodiment. FIG. 3 is a schematic cross-sectional view of a breathable water-absorbing member in the water heater of Example 3.

Embodiments 1 to 3 embodying the present invention will be described below with reference to the drawings.

(Example 1)
The hot 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 hot water supply device 1 seen from the front, and the front side of the paper in FIG. 1 is defined as the front of the water heater 1, the left side of the paper in FIG. 1 is defined as the left side of the water heater 1, The upper side of the paper in FIG. 1 is defined as the upper side of the water heater 1.

<Housing>
As shown in FIG. 1, the water heater 1 includes a housing 10. As shown in FIG. The housing 10 defines an internal space having a substantially rectangular parallelepiped shape.

<Can body and fan>
The water heater 1 includes a can body 12 and a fan 14.

The can body 12 is arranged at the upper part of the housing 10 . A combustion chamber 16 and an exhaust passage 18 extending above the combustion chamber 16 are formed within the can body 12 . A burner 20 is arranged in the combustion chamber 16.

An exhaust pipe 22 is provided on the upper end side of the left side wall of the can body 12 and projects leftward from the can body 12. One end of the exhaust pipe 22 communicates with the exhaust passage 18. The exhaust port 22a, which is the other end of the exhaust pipe 22, passes through 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 exhausted from the combustion chamber 16 to the outside via the exhaust passage 18, the exhaust pipe 22, and the exhaust port 22a.

The fan 14 is arranged below the can body 12 within the housing 10. Fan 14 supplies combustion air to burner 20 within combustion chamber 16 . Further, the fan 14 raises the combustion exhaust from the burner 20 within the can body 12, and sends it to the exhaust port 22a through the combustion chamber 16, the exhaust passage 18, and the exhaust pipe 22 in this order.

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) outside the casing 10. In the gas supply pipe 24, a source gas solenoid valve 26, a gas proportional valve 28, and a gas solenoid valve 30 are arranged in this order. Thereby, fuel gas such as city gas or propane gas is supplied to the burner 20 from an external gas supply source via the original gas solenoid valve 26, the gas proportional valve 28, and the gas solenoid valve 30.

The source gas solenoid valve 26 controls supply and stop of fuel gas to the burner 20 . The gas proportional valve 28 controls the amount of fuel gas supplied to the burner 20 by controlling the valve opening. The gas solenoid valve 30 controls supply and stop of fuel gas to the burner 20 . The burner 20 discharges fuel gas from its flame port and burns it. Thereby, the burner 20 generates high temperature combustion exhaust gas.

<Sensible heat exchanger and latent heat exchanger>
The water heater 1 includes 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 at the upper part of the can body 12 . The sensible heat exchanger 32 is located above the burner 20 and is disposed in the lower part of the exhaust passage 18 . The latent heat exchanger 34 is located above the sensible heat exchanger 32 and is disposed in the upper part of the exhaust passage 18 . The sensible heat exchanger 32 and the latent heat exchanger 34 extend almost entirely within the can body 12 in the left-right direction of the water heater 1 .

The high-temperature combustion exhaust gas generated by the burner 20 rises from the combustion chamber 16 and flows into the exhaust passage 18, and flows toward the exhaust pipe 22 while rising inside the exhaust passage 18. That is, the combustion exhaust gas from the burner 20 rises in the exhaust passage 18 while passing through the sensible heat exchanger 32 and the latent heat exchanger 34 in this order. The combustion exhaust gas is cooled by heat exchange in the sensible heat exchanger 32, and then further cooled by heat exchange in the latent heat exchanger 34, and is then discharged from the exhaust port 22a of the exhaust pipe 22 to the outside of the housing 10. be discharged.

The sensible heat exchanger 32 has heat transfer tubes 36 . The heat exchanger tube 36 is meandering, including a plurality of straight portions and a plurality of folded portions that are folded back in an arc shape to connect the straight portions. Each straight section of the heat transfer tube 36 has a plurality of heat transfer fins.

The sensible heat exchanger 32 exchanges heat between the water flowing through the heat transfer tubes 36 and the high-temperature combustion exhaust gas generated by the burner 20, and absorbs the sensible heat of the combustion exhaust gas.

The latent heat exchanger 34 includes heat transfer tubes 38. The heat exchanger tube 38 is a meandering corrugated tube including a plurality of straight portions and a plurality of folded portions that are folded back in an arc shape to communicate the straight portions.

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 that has passed through the sensible heat exchanger 32. The combustion exhaust is cooled to below the dew point temperature and the latent heat of the combustion exhaust is absorbed.

In this way, the sensible heat exchanger 32 and the latent heat exchanger 34 each heat the water passing therethrough with the high-temperature combustion exhaust and convert it into hot water.

<Water supply pipes, communication pipes, hot water supply pipes, and bypass pipes>
The hot water supply device 1 includes a water supply pipe 40, a communication pipe 42, a hot water supply pipe 44, and a bypass pipe 46. The water supply pipe 40, the communication pipe 42, the hot water supply pipe 44, and the bypass pipe 46 are housed within the housing 10.

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 pipe 38 of the latent heat exchanger 34 .

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

A hot water supply high limit switch 48 is provided near the inlet of the heat transfer tube 36 of the sensible heat exchanger 32 in the communication pipe 42 . The hot water supply high limit switch 48 detects overheating of the sensible heat exchanger 32.

The upstream end of the hot water supply pipe 44 is connected to the outlet of the heat transfer pipe 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 a hot water supply connecting member 58, which will be described later.

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 hot water flowing from the sensible heat exchanger 32 into the hot water supply pipe 44 . A hot water thermistor 54 is provided on the downstream side of the junction of the hot water pipe 44 with a bypass pipe 46 near a hot water connection member 58 (described later). The hot water supply thermistor 54 detects the temperature of hot water sent from the hot water supply pipe 44 to an external hot water supply path 66, which will be described later.

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

<Water supply connection member, hot water supply connection member, and water flow 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 amount control section 60.

A water supply channel 62 located outside the housing 10 is connected to the water supply connection member 56 . The water supply connection member 56 has a water filter/drain plug 64.

The hot water supply connection member 58 is connected to a hot water supply path 66 located outside the housing 10 . The hot water supply connection member 58 has an overpressure relief valve/drain plug 68 that operates to release the pressure when the pressure within the hot water supply pipe 44 becomes excessive.

The water amount control unit 60 is provided near the water supply connecting member 56 in the water supply pipe 40. The water amount control section 60 includes a water amount sensor 70, a water amount 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 .

The water flow sensor 70 detects the flow rate of water flowing through the water supply pipe 40 . The water amount servo 72 adjusts the flow rate of water flowing through the water supply pipe 40. The bypass servo 74 adjusts the opening degree to the bypass pipe 46 to control the flow rate of water sent to the latent heat exchanger 34 via the water supply pipe 40 and the flow rate of water sent from the water supply pipe 40 to the bypass pipe 46. Adjust the proportion of In addition, the bypass servo 74 operates in a bypass closed state in which water supplied to the water amount control section 60 is guided only to the water supply pipe 40, and in a bypass closed state in which water supplied to the water amount control section 60 is guided not only to the water supply pipe 40 but also to the bypass pipe 46. Guide the bypass to the open state, and switch to. 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 path 66 .

<Drain receiving part and breathable absorbing member>
The water heater 1 includes a drain tray 76 that receives drain 82 generated by condensation in the latent heat exchanger 34. The drain tray 76 is an example of a drain receiving portion of the present invention.

The drain tray 76 is disposed 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 tray 76 is placed in the combustion exhaust flow caused by the air force of the fan 14 . The drain tray 76 extends for approximately the same length as the latent heat exchanger 34 in the left-right direction and the front-back direction of the water heater 1 .

The upper surface of the bottom wall 78 of the drain tray 76 is an inclined surface that is inclined downward toward the combustion exhaust downstream side, that is, from the right side to the left side of the housing 10. As a result, a drain reservoir portion 84 in which the drain 82 is collected is formed on the left end side of the bottom wall 78 of the drain tray 76.

The hot water supply device 1 includes a breathable absorbing member 86. The breathable absorbing member 86 is disposed in the exhaust passage 18 on the combustion exhaust downstream side of the latent heat exchanger 34 and adjacent to the latent heat exchanger 34 . The breathable absorbent member 86 is sized to close the exhaust passage 18 . The breathable absorbent member 86 is arranged in the drain reservoir 84 of the drain tray 76. When the drain 82 accumulates in the drain reservoir 84, the lower end of the breathable absorbent member 86 is immersed in the drain 82.

The breathable absorbing member 86 is made of a porous resin material that has heat resistance and acid resistance against combustion exhaust gas. The breathable absorbing member 86 has a continuous pore structure having a large number of micropores so that when it is immersed in the drain 82, it can absorb water from the drain 82 by capillary action, and can also allow combustion exhaust to flow through it.

The breathable absorbent member 86 is immersed in the drain 82 and absorbs water from the drain 82 . The combustion exhaust gas that has passed through the latent heat exchanger 34 flows through the breathable absorbing member 86, so that the drain 82 that has absorbed water in the breathable absorbing member 86 is heated by the combustion exhaust gas and evaporates.

<Hot water supply operation>
When the hot water supply device 1 supplies hot water to the external hot water supply path 66, the fan 14 is operated to supply combustion air to the burner 20, and fuel gas is supplied to the burner 20 from an external gas supply source. to combust the fuel gas. At this time, water supplied from an external water supply source to the water supply channel 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 an external hot water supply path 66 via the hot water supply pipe 44 . At this time, high-temperature hot water flowing into the hot water supply pipe 44 from the sensible heat exchanger 32 and low-temperature water flowing into the hot water supply pipe 44 from the water supply pipe 40 via the bypass pipe 46 are mixed and supplied to the hot water supply pipe 66. The temperature of the hot water is adjusted. By adjusting the combustion amount of the burner 20 and the degree of opening of the bypass servo 74 to the bypass pipe 46, the temperature of the hot water supplied to the hot water supply path 66 can be adjusted to a desired temperature.

<Effect>
In the water heater 1 of the first embodiment, the combustion exhaust from the burner 20 flows through the exhaust passage 18 from the combustion chamber 16 due to the blowing force of the fan 14 that supplies combustion air to the burner 20, and the exhaust gas flows through the sensible heat exchanger 32. and the latent heat exchanger 34, and then sent to the exhaust pipe 22.

The lower end of the breathable absorbing member 86 disposed on the downstream side 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 received by the drain tray 76 . As a result, the water from the drain 82 is absorbed by the breathable absorbent member 86 . The combustion exhaust gas that has passed through the latent heat exchanger 34 flows through the breathable absorbing member 86 . Therefore, the drain 82 that the breathable absorbing member 86 has absorbed can be heated with high-temperature combustion exhaust and efficiently evaporated.

Further, since the drain 82 absorbed by the breathable water absorbing member 86 exists in a large number of pores, the contact area between the drain 82 and the combustion exhaust gas is increased. As a result, evaporation of the drain 82 is promoted.

The drain vapor generated within the breathable water-absorbing member 86 is reliably mixed with the combustion exhaust gas passing through the breathable water-absorbing member 86. As a result, a mixed gas of drain steam and combustion exhaust flows out of the breathable water absorbing member 86 and is discharged to the outside of the water heater 1 from the exhaust port 22a via the exhaust pipe 22. Therefore, the drain steam is not directly discharged to the outside of the hot water supply device 1, and there are few safety concerns.

Furthermore, the exhaust gas components discharged from the exhaust port 22a of this heat source device 1 are similar to the exhaust gas components of a sensible heat recovery type heat source device that does not have a latent heat exchanger and only has a sensible heat exchanger. Safety is also guaranteed in this respect.

Therefore, the water heater 1 of Example 1 does not require an expensive drain pipe, and can improve the reliability and safety of drain discharge.

In this water heater 1, the drain 82 received in the drain tray 76 is immediately absorbed by the breathable absorbing member 86 in the drain reservoir 84, and is also heated by the combustion exhaust gas passing through the breathable absorbing member 86 and quickly Evaporate. Therefore, the amount of drain 82 stored in the drain tray 76 can be reduced. Therefore, this hot water supply device 1 can easily cope with a case where a large amount of drain 82 is generated.

Further, since the drain 82 that collects in the drain tray 76 is not neutralized, generation of Legionella bacteria can be suppressed.

(Example 2)
In the hot water supply device 2 of the second embodiment, the exhaust passage 18 of the hot water supply device 1 of the first embodiment is provided with a guide portion and a constriction portion.

As shown in FIG. 2, the water heater 2 includes a guide section 88 and a throttle section 90. The guide portion 88 guides the combustion exhaust gas after passing through the latent heat exchanger 34 to the breathable absorbing member 86 . The guide portion 88 is formed by arranging a plate member 88a within the exhaust passage 18 so that the cross-sectional area of the exhaust passage 18 gradually narrows toward the downstream side of the combustion exhaust gas. In the second embodiment, the downstream end of the combustion exhaust gas in the guide section 88 is the constricted section 90 where the cross-sectional area of the flow path is the narrowest. The breathable absorbent member 86 is disposed adjacent to the constriction portion 90 .

Note that the throttle section 90 is not limited to the downstream end of the combustion exhaust of the guide section 88, but may be provided at an intermediate portion of the guide section 88.

In the water heater 2 of the second embodiment, the pressure of the combustion exhaust is reduced at the constriction section 90 in which the cross-sectional area of the flow path is narrowed in the guide section 88, so the breathable absorption member 86 disposed in the constriction section 90 is placed in a low-pressure environment. becomes. As a result, the boiling point of the drain 82 in the breathable absorbent member 86 is lowered, and evaporation of the drain 82 is further promoted.

The other configurations and effects of the second embodiment are the same as those of the first embodiment.

(Example 3)
The water heater of the third embodiment is obtained by changing the configuration of the breathable absorbing member 86 of the water heater 1 of the first embodiment.

As shown in FIG. 3, the breathable absorbing member 86 according to the water heater of Example 3 integrally has a flow section forming section 92 on the upstream side of the combustion exhaust gas.

The flow section forming section 92 is formed with a large number of first flow sections 94a and second flow sections 94b through which combustion exhaust gas flows. The first circulation portion 94a and the second circulation portion 94b are formed alternately in the upper and lower longitudinal directions of the circulation portion forming portion 92. The cross-sectional area of each first flow section 94a is narrowed toward the downstream side of the combustion exhaust gas. The downstream end of the combustion exhaust gas in each first circulation section 94a is an internal constriction section 96 having the narrowest cross-sectional area of the flow path. Each of the second flow portions 94b has a flow passage cross-sectional area widened toward the downstream side of the combustion exhaust gas.

The breathable absorbing member 86 also integrally has a flow forming portion 92 on the downstream side of the combustion exhaust gas.

The flow forming part 92 is made of a resin material. The flow forming part 92 is formed by resin molding, and is integrated with the breathable absorbent member 86 by heat welding or bonding with an adhesive.

In the water heater of the third embodiment, a flow section forming section 92 in which a large number of first flow sections 94a are formed is integrated on the upstream side of the combustion exhaust gas of the breathable absorbing member 86. An internal constriction part 96 having the narrowest flow path cross-sectional area is formed at the downstream end of the combustion exhaust gas of the plurality of first circulation parts 94a. This allows the breathable absorbent member 86 to be adjacent to a number of internal constrictions 96 . Since the pressure of the combustion exhaust gas is reduced at this internal constriction portion 96, the pressure at the location where the breathable water-absorbing member 86 is arranged becomes low. As a result, the boiling point of the drain 82 in the breathable water-absorbing member 86 is lowered, and evaporation of the drain 82 is further promoted.

In this water heater, the evaporation of the drain 82 can be further promoted without providing the guide portion 88 in the exhaust passage 18, so that the structure can be simplified compared to the second embodiment.

In the above, the present invention has been explained based on Examples 1 to 3, but the present invention is not limited to Examples 1 to 3, and can be applied with appropriate changes without departing from the spirit thereof. Needless to say.

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.

The present invention is applicable to, for example, a water heater that has only a hot water supply function, a water heater that has a hot water supply function and a bath reheating function, a hot water heater that has a hot water supply function and a heating function that circulates hot water between it and a heating device, etc. Can be used as a heat source device.

1, 2... Water heater (heat source device)
14... Fan 20... Burner 22a... Exhaust port 32... Sensible heat exchanger 34... Latent heat exchanger 76... Drain tray (drain receiver)
82... Drain 84... Drain reservoir part 86... Breathable water absorption member 88... Guide part 90... Squeezed part 92... Flow part forming part 94a... First circulation part (flow part)
96...Internal throttle part

Claims (3)

A burner that burns fuel;
a sensible heat exchanger that absorbs sensible heat from the combustion exhaust of the burner;
a latent heat exchanger that is disposed downstream of the combustion exhaust of the sensible heat exchanger and absorbs latent heat from the combustion exhaust after passing through the sensible heat exchanger;
an exhaust port for discharging combustion exhaust gas to the outside after passing through the latent heat exchanger;
a fan that supplies combustion air to the burner and sends combustion exhaust from the burner to the exhaust port via the sensible heat exchanger and the latent heat exchanger;
A heat source device comprising a drain receiver for receiving drain generated by condensation in the latent heat exchanger,
A heat source device comprising: a breathable water absorbing member that is disposed on the downstream side of the combustion exhaust of the latent heat exchanger, is immersed in the drain received by the drain receiver, and has a large number of pores. . A guide portion is provided on the upstream side of the combustion exhaust of the breathable water-absorbing member to guide the combustion exhaust after passing through the latent heat exchanger to the breathable water-absorbing member,
The guide part has a constricted part with a narrowed cross-sectional area of the flow path,
The heat source device according to claim 1, wherein the breathable water absorbing member is arranged in the constriction section. The breathable water-absorbing member integrally has a circulation part forming part on the upstream side of the combustion exhaust gas, in which a plurality of circulation parts are formed through which the combustion exhaust gas after passing through the latent heat exchanger is formed,
2. The heat source device according to claim 1, wherein the flow section has an internal constriction section with a narrowed flow path cross-sectional area at a combustion exhaust downstream end of the flow section.

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