JP2008298367A - Drain discharge system, neutralization device, and hot water heating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drain discharge system capable of preventing leakage of combustion gas generated along with combustion operation, a neutralization device equipped with the drain discharge system and a hot water heating device equipped with the drain discharge system and the neutralization device. <P>SOLUTION: The neutralization device 7 has a reservoir 30 having an inflow tank 31 and a discharge tank 32 separated from each other via a partition wall 33. In the reservoir 30, the inflow tank 31 and discharge tank 32 communicat with each other in a communication part 35 positioned below the partition wall 33, and when drain etc. is collected at a level exceeding a reference droughty water-level passing through a lower end part of the partition wall 33, the reservoir 30 becomes a water sealing state. During waiting for combustion, when a water level electrode 37b does not detect a water level of drain etc., the neutralization device 7 performs automatic water filling until the water level electrode 37b can detect the water level. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a drain discharge system for discharging drain generated in a hot water heater, a neutralizer for neutralizing the drain, and a hot water heater including the drain discharge system and the neutralizer.

  2. Description of the Related Art Conventionally, a so-called latent heat recovery type hot water heater as disclosed in Patent Document 1 below has been provided. In this kind of hot water heater, a heat exchanger is provided in the middle of the combustion gas passage through which the combustion gas passes, and not only sensible heat contained in the combustion gas but also latent heat is recovered in the heat exchanger. It can be configured. Therefore, in the latent heat recovery type hot / cold water heating device, drain is generated in the combustion gas passage along with the combustion operation.

Since the drain generated in the latent heat recovery type hot water heater is exposed to the combustion gas, it has a high acidity and is corrosive. For this reason, many of the conventional latent heat recovery type hot water heaters are provided with a drain discharge system for discharging drain so as to communicate with the combustion gas passage, and for neutralizing the drain in the middle of the drain discharge system. A neutralization device is provided to prevent drain from being discharged as it is.
JP 2003-74974 A

  The conventional hot water heater described above is configured to have a drain discharge system so as to communicate with the combustion gas passage. Therefore, there is a concern that not only the drain but also the combustion gas may be discharged through the drain discharge system.

  Here, in the case where the hot water heater is installed outdoors, it is assumed that there is no major problem even if the combustion gas is discharged to the outside through the combustion gas passage. However, in the case where the hot water heater is an indoor installation type, there is a problem that it is necessary to surely prevent a problem that combustion gas is discharged through the drain discharge system.

  Accordingly, the present invention provides a drain discharge system capable of preventing leakage of combustion gas generated in accordance with a combustion operation, a neutralizer provided with the drain discharge system, and hot water heating provided with the drain discharge system and the neutralizer. The purpose was to provide a device.

  According to the first aspect of the present invention, the heat exchange between the combustion means for burning the fuel, the combustion gas passage through which the combustion gas generated by the combustion operation in the combustion means flows, and the combustion gas flowing through the combustion gas passage is provided. A drain discharge system for discharging drain generated in a hot water heating apparatus provided with a heat exchange means capable of heating hot water or a heat medium, the storage means communicating with the combustion gas passage and capable of storing drain, A liquid replenishment unit capable of replenishing the storage unit with hot water or liquid, wherein the storage unit is located on the drain inflow side and the outflow side reservoir is located on the drain discharge side. And a communication part in which the inflow side storage part and the outflow side storage part communicate with each other, and the storage part stores the liquid so that the liquid level is equal to or higher than a predetermined liquid level. Stored in The liquid is sealed with a liquid and can be in a water-sealed state capable of preventing the passage of combustion gas, and the gas flows from the combustion gas passage side to the storage means side with the combustion operation of the combustion section Pressure is applied to the liquid stored in the inflow side reservoir, and the liquid in the storage means is maintained at a liquid level that can maintain the water-sealed state even when the liquid level of the inflow side reservoir is reduced to the maximum. Liquid level detecting means capable of detecting whether or not the liquid is present is provided, and liquid is supplied to the storage means by the liquid replenishing means up to a liquid level higher than the liquid level at which the presence of the liquid can be detected by the liquid level detecting means. A drain discharge system characterized by being replenished.

  In the drain discharge system of the present invention, a storage means capable of storing drain is provided, and when a liquid such as drain is accumulated above a predetermined liquid level, it becomes a water-sealed state and prevents discharge of combustion gas. can do. Further, the drain discharge system of the present invention is provided with a liquid replenishing means, whereby the storage means can be replenished with liquid. Therefore, according to the present invention, even if there is not enough drain to be in a water-sealed state in the storage means, the liquid replenishing means replenishes the storage means with liquid to form a water-sealed state. A drain discharge system capable of preventing the combustion gas from flowing out can be provided.

  Furthermore, in the drain discharge system of the present invention, even if a liquid level drop occurs in the inflow side storage section in a state where gas flows from the combustion gas passage side to the storage means side and pressure acts on the liquid stored in the storage means, The liquid is replenished by the liquid replenishing means so that the sealed state can be maintained. Therefore, according to the present invention, even if a pressure is applied to the liquid stored in the storage means during the combustion operation to the storage means, and the liquid level is lowered, the water sealing state is maintained and the leakage of the combustion gas is prevented. Possible drain discharge systems can be provided.

  According to the second aspect of the present invention, the liquid level detection means capable of detecting the liquid level is provided in one of the inflow side storage section and the outflow side storage section, and is detected by the liquid level detection means. 2. The drain discharge system according to claim 1, wherein the liquid can be replenished to the storage part on the other side of the storage part provided with the liquid level detection means by the liquid replenishment means based on the water level. is there.

  The invention according to claim 3 provided on the basis of the same knowledge has a liquid level detection means capable of detecting the liquid level, and the storage means includes a sub-storage part communicating with the outflow side storage part. The liquid level detection means is provided in one storage part selected from the inflow side storage part, the outflow side storage part, and the sub storage part, and the liquid replenishment means includes the liquid level. The drain discharge system according to claim 1 or 2, wherein a liquid can be replenished to a storage part different from the storage part provided with the liquid level detection means based on the water level detected by the detection means. It is.

  According to the configuration of the second or third aspect, even if the liquid splashes when the liquid is replenished by the liquid replenishing means, the splashed liquid is not directly applied to the liquid level detecting means. The possibility of adhesion is low. In addition, since the tank in which the liquid is replenished by the liquid replenishing means is different from the tank in which the liquid level detecting means is installed, the liquid replenishing means is different. Even if the liquid level undulates, an erroneous detection of the liquid level is less likely to occur. Therefore, if the structure of Claim 2 or Claim 3 is employ | adopted, the quantity of the liquid currently stored by the storage part will be grasped | ascertained correctly, and the replenishment of the liquid will be carried out so that it may become a suitable quantity for forming a water seal state The amount can be adjusted.

  According to a fourth aspect of the present invention, the communicating portion has a trap structure portion that rises upward from the bottom surface side of the inflow side storage portion, and the hot water or liquid that is on the inflow side storage portion side in the trap structure portion It is possible to make a water-sealed state by entering the state, and the combustion gas with respect to a horizontal line passing through the upper end of the opening formed at the connection position of the trap structure part and the inflow side storage part The inflow side reservoir is located above the amount of decrease in the liquid level of the inflow side reservoir, which is assumed when gas flows from the passage side to the storage means side and pressure acts on the liquid stored in the inflow side reservoir. The drain discharge system according to any one of claims 1 to 3, wherein the storage means is replenished with the liquid replenishing means so that the liquid level in the tank reaches.

  In the drain discharge system of the present invention, if there is a liquid level in the inflow side storage part up to a position exceeding the horizontal line passing through the upper end of the opening formed at the connection position between the trap structure part and the inflow side storage part, the flow path of the communication part Is blocked with drain or hot water and becomes water-sealed. On the other hand, in the drain discharge system of the present invention, when the gas flows from the combustion gas passage side to the storage means side and pressure acts on the liquid stored in the inflow side storage part, the liquid level of the inflow side storage part decreases. There is a possibility that drain or hot water in the communication part forming the water-sealed state will escape to the outflow side storage part side. However, the drain discharge system of the present invention is configured such that the liquid is replenished by the liquid replenishing means after assuming the liquid level lowering amount in the inflow side reservoir. Therefore, in the drain discharge system of the present invention, even if pressure acts on the liquid level in the inflow side reservoir due to the flow of gas, the water seal state can be maintained and the passage of the combustion gas can be prevented.

  Here, as described above, the drain discharge system described in each claim is configured to be able to replenish the storage means with the liquid replenishing means, but the liquid supply pressure by the liquid replenishing means is high, When a large amount of liquid is supplied per unit time, there is a possibility that problems such as overflow of liquid from the storage means occur due to the influence. In addition, when the liquid replenishing means forms a replenishment flow path through which liquid flows by a hose or piping for supplying liquid to the storage means, and this is connected to the storage means, the influence of the liquid supply pressure, etc. This may cause problems such as disconnection of hose and pipe connections.

  Accordingly, the invention according to claim 5 provided in consideration of such a problem is that the liquid replenishing means has a replacement fluid channel that is connected to the storage means from the outside and can supply liquid to the storage means. The drain discharge system according to any one of claims 1 to 4, wherein a flow rate adjusting means having an orifice is provided in the middle of the flow path.

  In the drain discharge system of the present invention, since the orifice is provided in the middle of the liquid replenishment flow path, the flow rate and pressure of the liquid supplied to the storage means can be adjusted to an appropriate state. Therefore, in the drain discharge system of the present invention, it is possible to prevent the occurrence of problems such as the liquid overflowing from the storage means or the connection portion of the liquid replenishing flow path being disconnected.

  In the invention according to claim 6, the liquid replenishing means is connected to the storage means from the outside, and has a replacement fluid flow path capable of supplying the liquid to the storage means, and the flow rate adjusting means is provided in the middle of the replacement fluid flow path. The flow rate adjusting means includes a flow rate adjusting valve and a flow rate detecting means, and the opening degree of the flow rate adjusting valve is adjusted based on the flow rate of the liquid detected by the flow rate detecting means. The drain discharge system according to any one of claims 1 to 5.

  The drain discharge system of the present invention has a flow rate adjusting means having a flow rate adjusting valve and a flow rate detecting means in the middle of the liquid replenishing flow path, and detects the flow rate of the liquid by the flow rate detecting means, and based on this, the flow rate It is set as the structure which can adjust the opening degree of an adjustment valve. Therefore, in the drain discharge system of the present invention, it is possible to prevent the liquid supply pressure by the liquid replenishing means from becoming excessively high and the liquid supply amount per unit time from becoming excessive. Therefore, in the drain discharge system of the present invention, it is possible to prevent the occurrence of problems such as the liquid overflowing from the storage means or the connection portion of the liquid replenishment flow path being disconnected.

  A seventh aspect of the present invention is a neutralization apparatus comprising the drain discharge system according to any one of the first to sixth aspects, wherein the drain can be neutralized and discharged.

  Since the neutralization device of the present invention has the above-described drain discharge system configuration, a water-sealed state is formed by the drain generated due to the heat exchange of the combustion gas and the liquid replenished by the liquid replenishing means. can do. Further, in the neutralization device of the present invention, assuming the fluctuation of the liquid surface position in the storage means due to the flow of gas such as combustion gas from the combustion gas passage side to the storage means side, the liquid is stored in the storage means as necessary. It is configured to be replenished. Therefore, according to this invention, the neutralization apparatus which can prevent the leakage of combustion gas can be provided.

  Here, in the neutralization apparatus of the present invention, drain is stored in the storage means, and it is assumed that this drain is exposed to the combustion gas or the like and is in a high acidity state. Therefore, it is preferable that the drainage is not discharged as it is when it is discharged from the storage means, but it is neutralized and discharged.

  Then, the invention of Claim 8 provided based on this knowledge is equipped with the drain discharge system | strain in any one of Claims 1-6, and the drain outlet is provided in the bottom part of the storage means. And a neutralizing agent capable of neutralizing the drain is arranged in the middle of the discharge path of the liquid discharged from the storage means through the drain port.

  When the neutralization device of the present invention is adopted, when the liquid in the storage means is discharged from the drain port, the liquid is always discharged after passing through the neutralizing agent. Therefore, according to the neutralization apparatus of the present invention, the acidity of the liquid discharged from the drain port can be reduced.

  According to the ninth aspect of the present invention, there is provided heat exchange between a combustion means for burning fuel, a combustion gas passage through which a combustion gas generated by a combustion operation in the combustion means flows, and a combustion gas flowing through the combustion gas passage. A heat exchanging means capable of heating hot water or a heat medium, and one or both of the drain discharge system according to any one of claims 1 to 6 and the neutralization device according to claim 7 or 8 are provided. This is a hot water heater.

  The hot water heating apparatus of the present invention is provided with either one or both of the drain discharge system and the neutralization apparatus described above. Therefore, a water seal is formed by the drain generated by the heat exchange of the combustion gas and the liquid replenished by the liquid replenishing means, and the combustion gas is prevented from being discharged through the drain discharge system and the neutralizer. can do. Further, in the hot water heating apparatus of the present invention, even if the liquid level position in the storage means fluctuates due to the influence of a gas such as combustion gas flowing from the combustion gas passage side to the storage means side during the combustion operation, The storage means is replenished with liquid so that the sealed state is not eliminated. Therefore, in the hot water heating apparatus of the present invention, there is no problem that the combustion gas is discharged through the drain discharge system or the neutralizer.

  ADVANTAGE OF THE INVENTION According to this invention, even if the combustion gas etc. which generate | occur | produce with combustion operation | movement flow in, the drainage system which maintains a water seal state and can prevent the leakage of combustion gas, and the neutralization provided with the said drainage system An apparatus, a hot water heating apparatus provided with the drain discharge system and the neutralization apparatus can be provided.

  Next, a hot water supply device 1 (hot water heater) according to an embodiment of the present invention will be described in detail with reference to the drawings. In the following description, the vertical / horizontal positional relationship will be described based on a normal installation state unless otherwise specified.

  The hot water supply apparatus 1 is a so-called latent heat recovery type hot water heating apparatus including a combustion section 2 (combustion means), a primary heat exchanger 20 and a secondary heat exchanger 25. The hot water supply device 1 includes a combustion case 3 and an exhaust collecting unit 5 below the combustion unit 2. As a result, the hot water supply device 1 is formed with a space communicating from the combustion case 3 through the exhaust collecting portion 5 to the silencer 6 so that the cross-sectional shape is substantially “U” -shaped. A silencer 6 is provided on the side of the combustion unit 2, and a neutralizer 7 is provided below the combustion case 3. The combustion case 3 and the silencer 6 communicate with an exhaust collecting part 5 provided on the bottom side of the hot water supply device 1.

  As shown in FIG. 1, the combustion unit 2 includes an air case 8, a fuel spray nozzle 10, a blower 11, a combustion cylinder 12, and the like. The combustion part 2 is comprised by what is called a reverse combustion type combustion apparatus, and can form a flame toward the downward direction. That is, the combustion unit 2 operates the blower 11 to introduce combustion air into the air case 8 and directs the liquid fuel supplied from a fuel supply source (not shown) downward from the fuel spray nozzle 10. It is set as the structure which can be sprayed and combusted in the combustion cylinder 12. FIG.

  The combustion case 3 is located on the lower side with respect to the combustion part 2 and is a part through which high-temperature combustion gas generated in accordance with the combustion operation in the combustion part 2 flows, and is combined with the exhaust collecting part 5 and the muffler part 6. Thus, a series of combustion gas passages 4 is formed. A primary heat exchanger 20 and a secondary heat exchanger 25 are provided inside the combustion case 3. The primary heat exchanger 20 is located on the upstream side in the flow direction of the combustion gas flowing through the combustion unit 2, that is, on the upper side in the illustrated state. On the other hand, the secondary heat exchanger 25 is located on the downstream side in the flow direction of the combustion gas flowing through the combustion unit 2, that is, on the lower side in the illustrated state.

  A water inlet (not shown) of the primary heat exchanger 20 and a water outlet (not shown) of the secondary heat exchanger 25 are connected by a pipe (not shown). Further, a pipe connected to a place (hot water supply destination) serving as a hot water supply destination such as a currant or a bathtub is connected to the water outlet 20 a of the primary heat exchanger 20. Further, a water inlet pipe 26 for supplying hot water to be heated from the outside is connected to the water inlet 25a of the secondary heat exchanger 25. Therefore, when there is a hot water supply request at the hot water supply destination and hot water is supplied from an external water supply source via the water inlet pipe 26, this hot water is supplied to the water inlet 25 a of the secondary heat exchanger 25. The hot water supplied to the water inlet 25a flows through the secondary heat exchanger 25, and then is sequentially heat exchange heated by flowing through the primary heat exchanger 20, and then the hot water supply destination from the water outlet 20a of the primary heat exchanger 20 Supplied towards

  The exhaust collecting portion 5 is a portion that is disposed below the combustion case 3 and communicates directly with the combustion case 3. Exhaust collecting portion 5 has an internal space that extends in the width direction (right and left direction in FIG. 1) of hot water supply device 1 on the bottom side of hot water supply device 1. Further, the exhaust collecting part 5 communicates with a muffler part 6 arranged on the side of the combustion case 3. Therefore, the exhaust collecting portion 5 functions as a portion that allows the combustion gas that flows downward in the combustion case 3 to flow in and flows out toward the silencer 6. In other words, the exhaust collecting portion 5 functions as a portion for turning upward the flow direction of the combustion gas flowing downward.

  A drain discharge port 27 is provided at the bottom of the exhaust collecting portion 5. The drain discharge port 27 functions as a discharge port for discharging the drain falling from the secondary heat exchanger 25 side to the outside of the exhaust collecting portion 5.

  A neutralizing device 7 is disposed below the exhaust collecting portion 5, accepts drain discharged from the drain discharge port 27, neutralizes it, and discharges it. That is, the neutralization device 7 has a function as a drain discharge system for discharging drain generated in the hot water supply device 1 and a function as a neutralizer for neutralizing the drain. As shown in FIG. 1, the neutralization device 7 includes a storage container 30 (storage means) that can store drain, and a water injection means 40 (liquid replenishment means) that can replenish hot water from the outside of the storage container 30. I have.

  The storage container 30 is roughly classified into two tanks, and communicates so that drains and hot water can pass back and forth. Specifically, the storage container 30 has an inflow tank 31 (inflow side storage part) and a discharge tank 32 (outflow side storage part), and the both are separated by a partition wall 33. In addition, a discharge portion 34 is provided at a position adjacent to the discharge tank 32, and both communicate with each other at a position above the discharge tank 32.

  The inflow tank 31 is a tank located on the inflow side of the drain flowing from the exhaust collecting portion 5 side, that is, on the upstream side in the drain flow direction. In the present embodiment, the inflow tank 31 is connected to the drain outlet 27 of the exhaust collecting portion 5. The discharge tank 32 is an inflow tank 31 when assuming the flow of drain discharged from the discharge side of the drain flowing into the storage container 30, that is, from the exhaust collecting portion 5 through the neutralization device 7 constituting the drain discharge system. Is a tank existing downstream in the drain flow direction. In the present embodiment, the discharge tank 32 is provided at a position adjacent to the inflow tank 31.

  A partition wall 33 disposed between the inflow tank 31 and the discharge tank 32 extends from above the storage container 30 downward. In a state in which a liquid such as drain or hot water is stored in the storage container 30, the partition wall 33 isolates both water surfaces between the inflow tank 31 and the discharge tank 32. On the other hand, the storage container 30 is in a state where the inflow tank 31 and the discharge tank 32 communicate with each other at a position below the partition wall 33 (hereinafter also referred to as a communication part 35). That is, the partition wall 33 does not reach the bottom surface 30a of the storage container 30, and between the lower end portion of the partition wall 33 and the bottom surface 30a, drain and hot water flow between the inflow tank 31 and the discharge tank 32. There is nothing to stop.

  The inflow tank 31 is provided with a ground electrode 36 and three water level electrodes 37 (hereinafter referred to as 37a, 37b, and 37c, respectively) for detecting the liquid level. The ground electrode 36 and the water level electrodes 37 a to 37 c are electrically connected to a control device 50 provided for controlling the operation of the hot water supply device 1.

  The ground electrode 36 and the water level electrode 37a are substantially suspended from the top surface 30b side of the storage container 30 toward the bottom surface 30a side in the inflow tank 31, respectively. Further, the ground electrode 36 and the water level electrode 37a reach the position corresponding to the lower end portion of the partition wall 33, in other words, the upper end portion of the communication portion 35, respectively. When it is detected that there is continuity between the ground electrode 36 and the water level electrode 37a, the liquid level in the inflow tank 31 is at least a position corresponding to the lower end of the water level electrode 37a, that is, the position corresponding to the upper end of the communicating portion 35. The communication portion 35 is sealed with drain or hot water (this state is hereinafter referred to as a water-sealed state). That is, the water level electrode 37a can exhibit a function as a water seal state detecting means for detecting whether or not the storage container 30 is in a water seal state.

  The water level electrode 37 b is an electrode that is substantially parallel to the water level electrode 37 a and is attached so as to substantially hang downward from the top surface 30 b side in the inflow tank 31 of the storage container 30. The lower end portion of the water level electrode 37b exists at a position higher than the lower end portion of the water level electrode 37a (position on the top surface 30b side), that is, a position on the side where the liquid level rises when drainage or the like flows into the storage container 30. ing.

  The attachment position of the water level electrode 37b is the maximum within the range assumed in the liquid level in the inflow tank 31 by the influence of the combustion gas generated in the combustion gas passage 4 in the combustion part 2 and the outside air flowing back through the silencer 6. Is attached at a position where it can be detected whether or not an amount of drainage or the like that can maintain a water-sealed state is accumulated even under a situation where the liquid level in the inflow tank 31 is lowered. More specifically, when the combustion unit 2 burns at the maximum combustion amount, the generation amount of the combustion gas reaches the maximum. Since the inflow tank 31 communicates with the combustion gas passage 4 through which the combustion gas flows, a pressure corresponding to the flow amount of the combustion gas acts on the liquid level in the inflow tank 31 as the combustion gas flows. . Therefore, when the combustion part 2 burns with the maximum combustion amount, it is assumed that the liquid level fall amount in the inflow tank 31 resulting from the flow of combustion gas reaches the maximum.

  In addition, when the hot water supply device 1 is exposed to a strong wind, the outside air may flow backward through the silencer 6. In this case, the external air that has flowed into the inflow tank 31 through the exhaust collecting portion 5 and the drain discharge port 27 causes pressure to act downward on the water surface on the inflow tank 31 side, and the liquid level decreases. When the wind speed of the back wind acting on the hot water supply device 1 is high enough to be unsuitable for performing the combustion operation, it is assumed that the water level in the inflow tank 31 is also greatly reduced by that amount.

  Therefore, assuming these situations, the combustion section 2 performed the combustion operation at the maximum combustion amount in the situation where the hot water supply device 1 was exposed to the maximum amount of headwind as long as the combustion operation could be performed in the combustion section 2. In order to maintain a water-sealed state even when pressure is applied to the liquid level in the inflow tank 31 and the liquid level is lowered in the inflow tank 31, a drain or the like that should be stored in the storage container 30 during combustion standby Liquid level (hereinafter also referred to as a water injection reference liquid level Lc). Therefore, in the present embodiment, the water level electrode 37b is attached at a position where it can be detected whether or not the liquid level of the drain or the like in the storage container 30 has reached the water injection reference liquid level Lc.

  The water level electrode 37c is attached so as to hang substantially downward from the top surface 30b side of the storage container 30 in the same manner as the water level electrodes 37a and 37b described above. The water level electrode 37c is provided to detect whether or not the storage container 30 is full, that is, whether or not there is a possibility of drain overflow from the storage container 30 other than the discharge port 34a. The part is at a position (position on the top surface 30b side) higher than the above-described water level electrodes 37a and 37b.

  The discharge tank 32 has a larger volume than the inflow tank 31 described above. The storage container 30 has a drain port 38 on the bottom surface on the discharge tank 32 side. In the drain tank 32, two partitions 32a and 32b are provided. The space in the discharge tank 32 is divided by the partitions 32a and 32b into three spaces including a space on the inflow tank 31 side, a space on the discharge unit 34 side, and a space in between the two spaces.

  The partitions 32 a and 32 b are provided so as to extend in the vertical direction in the discharge tank 32, and do not exist between the lower end portion and the bottom surface 30 a of the storage container 30. Therefore, the three spaces formed by dividing the space in the inflow tank 31 by the partitions 32a and 32b are in communication with each other. On the other hand, as shown in FIG. 1 and FIG. 2 and the like, the upper ends of the partitions 32a and 32b are lower than the lower end of the discharge port 39 that connects the discharge tank 32 and the discharge unit 34, that is, the above-described water injection completion water level Lm. It protrudes slightly upward. That is, the upper ends of the partitions 32a and 32b are in positions that protrude slightly upward from the liquid surface position when liquid such as drain or hot water overflows from the discharge tank 32 side to the discharge portion 34 side.

  The discharge part 34 is a part attached to the side of the discharge tank 32, and is discharged through a discharge port 39 provided at a position unevenly distributed on the upper end side of the discharge tank 32, that is, on the top surface 30 b side of the storage container 30. 32. A discharge port 34 a for discharging drain or the like overflowing from the discharge tank 32 through the discharge port 39 is provided at the lower portion of the discharge unit 34.

  As shown in FIG. 1, the water injection means 40 includes a water injection pipe 41 and a valve 42. The water injection pipe 41 is a pipe branched in the middle of the water inlet pipe 26 connected to the water inlet 25 a of the secondary heat exchanger 25 described above, and supplies hot water supplied from the outside toward the storage container 30. can do. The water injection pipe 41 is connected to the top surface 30b on the discharge tank 32 side of the storage container 30, and has a structure capable of pouring water on the discharge tank 32 side. The valve 42 is provided in the middle of the water injection pipe 41.

  A neutralizing agent C for neutralizing the drain is accommodated in the storage container 30 described above. As shown in FIG. 1, in this embodiment, the neutralizing agent C is accommodated in the entire discharge tank 32.

  As shown in FIG. 1, the silencer 6 has a cylindrical space 6 b that is surrounded in all directions and communicated in the vertical direction. The space 6b in the silencer 6 communicates with the exhaust collecting part 5 on the lower end side. The silencer 6 has an exhaust port 6c on the upper end side, and the space 6b communicates with the external atmosphere via the exhaust port 6c.

  Then, operation | movement of the hot water supply apparatus 1 is demonstrated. In the hot water supply apparatus 1, for example, in the middle of the water inlet pipe 26, the combustion unit 2 is in a combustion operation when a flow rate detection signal is input from a flow rate sensor (not shown) provided on the downstream side of the water injection pipe 41. To start. Combustion gas generated in the combustion cylinder 12 along with the combustion operation in the combustion unit 2 flows downward in the combustion case 3. Thereafter, the combustion gas flows into the exhaust collecting portion 5 provided on the bottom side of the hot water supply device 1.

  The combustion gas that has flowed into the exhaust collecting portion 5 flows in the exhaust collecting portion 5 in the horizontal direction, that is, toward the side connected to the silencer 6 (rightward in FIG. 1). Thereafter, the combustion gas flows toward the silencer 6 connected above the exhaust collecting part 5. That is, the combustion gas generated in the combustion section 2 and flowing downward in the combustion case 3 changes its flow direction in the exhaust collecting section 5 and flows upward in the muffler section 6 before being exhausted. It is discharged outside through the mouth 6c.

  On the other hand, hot water supplied from the outside via the water inlet pipe 26 flows into the secondary heat exchanger 25 via the water inlet 25 a of the secondary heat exchanger 25. The hot water flowing into the secondary heat exchanger 25 mainly recovers the latent heat contained in the combustion gas and is heated by this. Along with this, moisture contained in the combustion gas is aggregated and drainage is generated on the surface of the secondary heat exchanger 25 and the like.

  Hot water heated by the secondary heat exchanger 25 exits the water outlet (not shown) of the secondary heat exchanger 25 and enters the primary heat exchanger 20 from the water inlet (not shown) of the primary heat exchanger 20. Flow into. The hot water flowing into the primary heat exchanger 20 is heated by heat exchange with the combustion gas generated along with the combustion of fuel in the combustion section 2. In the primary heat exchanger 20, the sensible heat mainly contained in the combustion gas is recovered. The hot water heated in the primary heat exchanger 20 in this way flows out from the water outlet 20a of the primary heat exchanger 20, and is supplied toward a curan or a bathtub or the like as a hot water supply destination.

  As described above, in the hot water supply apparatus 1, drainage is generated along with heat exchange in the secondary heat exchanger 25. The drain generated here falls in the combustion case 3 and collects in the exhaust collecting portion 5. Thereafter, the drain flows into the inflow tank 31 of the storage container 30 of the neutralization device 7 provided below the exhaust collecting portion 5 through the drain discharge port 27 provided at the bottom of the exhaust collecting portion 5. The drain that has flowed into the inflow tank 31 is neutralized by the neutralizing agent accommodated in the storage container 30.

  Next, the operation of the neutralization device 7 and the relationship between the water level in the neutralization device 7 and the combustion operation in the combustion unit 3 will be described in detail with reference to the drawings. The hot water supply device 1 is in a state in which there is no drain or hot water in the storage container 30 after the initial stage immediately after installation or after drainage or hot water is discharged from the storage container 30 via the drain port 38. . Thus, in a state where there is no drain or hot water in the storage container 30, the communication part 35 existing below the partition wall 33 separating the inflow tank 31 and the discharge tank 32 is sealed with drain or hot water, that is, It is not water-sealed.

  In addition, as shown in FIG. 2D, there may be a case where very little drain or hot water remains in the storage container 30. If the water level of the drain or the like existing in the storage container 30 does not reach the horizontal line (hereinafter also referred to as the drought reference water level Ld) passing through the upper end part (the lower end part of the partition wall 33) of the communication part 35, As in the case where there is no drain or hot water, the communication part 35 is not in a water-sealed state.

  As described above, when the combustion operation is performed in the state where the communication portion 35 is not in the water-sealed state in the storage container 30, the combustion gas that has flowed into the storage container 30 from the exhaust collecting portion 5 passes through the storage container 30. The combustion gas will be discharged from a position unexpected by the user. Therefore, when the water level electrode 37b does not detect the water level at the time of combustion standby, automatic water injection is performed until the water level electrode 37b can detect the water level.

  Here, in the combustion stopped state, it is detected that the water level is higher than the drought reference water level Ld on the inflow tank 31 side of the storage container 30, and even if there is no risk of combustion gas leaking through the storage container 30, 1 is exposed to strong winds, and it may not be preferable to perform a combustion operation in the combustion section 2. In addition, as described above, when the hot water supply device 1 is exposed to a head wind that is not preferable to perform the combustion operation, the water level on the inflow tank 31 is lowered to a position below the lower end of the water level electrode 37b. is assumed. Therefore, the hot water supply device 1 does not operate the combustion unit 2 when the water level is not detected by the water level electrode 37b, that is, when continuity is not confirmed between the water level electrode 37b and the ground electrode 36.

  As described above, in the neutralization device 7 of the present embodiment, when the liquid level is higher than the drought reference water level Ld in the storage container 30 capable of storing the drain, the communication unit 35 is water It becomes a sealed state and can prevent that the combustion gas which flowed into the inflow tank 31 passes through the storage container 30, and is discharged | emitted outside. Moreover, in the neutralization apparatus 7 of this embodiment, the water injection means 40 is provided and the liquid can be replenished to the storage container 30 by this. Therefore, according to the present embodiment, the hot water supply apparatus 1 is used for a long period of time, such as immediately after installation of the hot water supply apparatus 1 or after draining water from the storage container 30, in a state where there is no drain or the like in the storage container 30. Even in a state where there is not enough drain to make the storage container 30 into a water-sealed state because the water in the storage container 30 evaporates due to the absence or the like, the combustion operation is performed in this state. It is possible to prevent a problem that gas leaks through the neutralizing device 7.

  Further, as described above, in this embodiment, the combustion gas flows from the exhaust collecting portion 5 side to the storage container 30 side, and the pressure acts on the liquid accumulated in the storage container 30 to reduce the water level in the inflow tank 31. In such a case, the combustion operation is performed after the storage container 30 is replenished with liquid by the water injection means 40 so that the water-sealed state can be maintained. Therefore, in the hot water supply device 1 of the present embodiment, even if the combustion gas flows into the inflow tank 31 and the water surface is lowered, the water seal state can be reliably maintained, and leakage of the combustion gas can be prevented.

  In the neutralization device 7 employed in the hot water supply device 1 of the present embodiment, the water level electrodes 37a to 37c are provided in the inflow tank 31, and the water injection pipe 41 of the water injection means 40 is connected to the discharge tank 32 side. It is said that. That is, the neutralization apparatus 7 differs in the tank in which the water level electrodes 37a-37c are provided, and the tank in which the water injection line 41 is connected. In other words, a tank (this embodiment) in which the liquid level stored in a tank (inflow tank 31 in the present embodiment) in which the water level electrodes 37a to 37c are provided and the water injection pipe 41 are connected. Then, the liquid level stored in the discharge tank 32) is divided by the partition wall 33. Therefore, according to the above-described configuration, even if water splashes or the water surface undulates when water is poured into the storage container 30, the water level electrodes 37a to 37c are used in the storage container 30 without being affected by this. It is possible to accurately grasp the water level and adjust the replenishment amount of water so that the water level is suitable for forming a water seal state.

  Here, when it is set as the structure which can replenish hot water to the storage container 30 by the water injection means 40 as mentioned above, the supply pressure of the hot water which flows through the water injection pipe line 41 is high, or it flows through the water injection pipe line 41 per unit time. A large amount of hot water may be supplied to the storage container 30. When such a situation occurs, there is a possibility that hot water supplied from the outside overflows from the storage container 30 or that a hose or a pipe connecting portion constituting the water injection pipe 41 is disconnected.

  Therefore, in the hot water supply apparatus 1 described above, the water injection means 40 employed in the neutralization apparatus 7 includes, for example, a flow rate adjustment means 45 provided with an orifice 43 in the middle of the water injection pipe 41 as shown in FIG. It is good also as a provided structure. In addition, as shown in FIG. 3B, the water injection means 40 includes a flow rate detection means 46 such as a conventionally known flow rate sensor in addition to the valve 42 in the middle of the water injection pipe 41, and this is detected. It is good also as a structure which adjusts the opening degree of the valve 42 so that the quantity and supply pressure of the hot water supplied to the storage container 30 may be in the optimal state based on the flow volume performed. With such a configuration, when the neutralizer 7 is replenished with hot water from an external water supply source, hot water overflows from the storage container 30 or a connection portion of the water injection pipe 41 is disconnected. Can be prevented.

  In the neutralization device 7 of the present embodiment, when the liquid in the storage container 30 is discharged from the drain port 38 provided on the bottom surface 30a of the storage container 30, drainage, water, or the like is discharged as shown by an arrow in FIG. Water passes through the storage container 30. Moreover, in the neutralization apparatus 7, the neutralizing agent is arranged in the middle of discharge routes, such as drain. Therefore, in the neutralization apparatus 7, even if drain having high acidity exists in the storage container 30, the drain passes through the neutralizing agent when draining water, so that the acidity of the waste water is extremely high. Low.

  In addition, in the said embodiment, the thing of the structure which installs the neutralizing agent in the middle of the drain discharge path | route in order to make it the structure which can also neutralize drain also in the drain at the time of draining water from the neutralization apparatus 7 is illustrated. However, the present invention is not limited to this, and may not have such a configuration.

  The present invention is not limited to the above-described embodiment. For example, instead of the storage container 30, a space between the inflow tank 71 corresponding to the inflow tank 31 of the storage container 30 and the discharge tank 72 corresponding to the discharge tank 32 is provided. You may employ | adopt the storage container 70 provided with the trap structure connected by the communication part 73 (trap structure part) which stands up toward the top | upper surface side of the discharge tank 72 from the bottom face side of the inflow tank 71. FIG. In the case of such a configuration, there is a possibility that combustion gas or outside air flows into the inflow tank 71 and the water seal state is canceled as the water level decreases. More specifically, when the storage container 70 is employed, as shown in FIG. 5 (a), a horizontal plane (hereinafter referred to as a drought reference water level) passing through the upper end of the opening at the communicating portion between the inflow tank 71 and the communicating portion 73. If there is a water surface above (referred to as Md), the flow path in the communication portion 73 is blocked with water, and the combustion gas or the like cannot pass between the inflow tank 71 and the discharge tank 72.

  However, for example, as shown in FIG. 5B, combustion gas or outside air may flow into the inflow tank 71 in a state where the water surface of the drain or the like in the inflow tank 71 has only the same level as the drought reference water level Md. The pressure may act on the liquid surface on the inflow tank 71 side in the direction toward the lower side of the inflow tank 71 due to the influence of the combustion gas flowing through the combustion gas passage 4 or the flow of outside air. In this case, as the liquid level in the inflow tank 71 decreases, the liquid level of drain or the like in the communication part 73 rises in the communication part 73. Along with this, a part of the drain or hot water that is on the inflow tank 71 side and is blocked so that the combustion gas cannot pass through the communication part 73 is pushed out to the discharge tank 72 side through the communication part 73. Sometimes.

  After the phenomenon as described above has occurred, when the pressure acting downward on the liquid surface in the inflow tank 71 is reduced or the pressure is released, as shown in FIG. The liquid level on the inflow tank 71 side is lowered by the amount of drain discharged to the discharge tank 72 side, and the water seal state is eliminated. Therefore, when the storage container 70 having the trap structure as used in the neutralization device 60 shown in FIG. 5 is used, the water level on the inflow tank 71 side is not less than the drought reference water level Md at the start of the combustion operation. Even so, there is a possibility that the water-sealed state may be eliminated with the inflow of combustion gas or outside air.

  Therefore, when the neutralization device 60 having a trap structure as shown in FIG. 5 is adopted, the maximum amount of water level drop in the inflow tank 71 due to the inflow of combustion gas or outside air is assumed, and a drought standard corresponding to this is assumed. It is desirable that the combustion operation is performed after pouring water into the storage container 70 so that the water surface in the inflow tank 71 reaches a position exceeding the position higher than the water level Md. More specifically, the maximum pressure (hereinafter also referred to as the maximum combustion exhaust gas pressure) acts on the liquid level in the inflow tank 71 of the neutralization device 60 within the range assumed in the normal combustion state in accordance with the combustion operation. In this situation, it is assumed that the liquid level in the inflow tank 71 is greatly reduced. In addition, even when exposed to the backflow of the air volume that defines that the combustion operation can be performed, it is assumed that the liquid level in the inflow tank 71 is greatly reduced by the outside air flowing into the inflow tank 71. The

  Here, the height of the water surface that is assumed to decrease due to the maximum combustion exhaust gas pressure acting on the liquid level in the inflow tank 71 is Hg, and the inflow is caused by exposure to the airflow of the air flow that defines that the combustion operation can be performed. Assuming that the height of the water surface, which is assumed to decrease due to the outside air flowing into the tank 71, is Ha, within the range in which the combustion operation can be performed, the sum of these (Hg + Ha) is the upper limit. The liquid level in the inflow tank 71 may be lowered. Therefore, when the neutralization device 60 having a trap structure as shown in FIG. 5 is adopted, water is poured so that the water surface reaches a position higher than the drought reference water level Md (hereinafter also referred to as the water injection reference water level Mm). It is desirable that the combustion operation be performed. In the case of such a configuration, as shown in FIG. 5, it is desirable to provide a water level detection means 80 or the like that can detect whether or not the liquid level has reached the water injection reference water level Mm. In the present embodiment, as shown in the above embodiment, as the water level detection means 80, a combination of the water level electrode 75 and the ground electrode 76 is adopted, and continuity between the two is detected. The liquid level electrode 75 is configured to detect whether or not the liquid level exists above the tip (lower end) position.

  In the above-described neutralization devices 7 and 60, a configuration in which the ground electrode 36 and the water level electrodes 37a to 37c are combined as a configuration for detecting the water level, or a combination of the water level electrode 75 and the ground electrode 76 is used. However, the present invention is not limited to this. That is, instead of the water level detecting means such as a combination of the ground electrode 36 and the water level electrode 37, a conventionally known float sensor, ball tap, pressure sensor, optical sensor, or the like may be used.

  In the said embodiment, it was the structure which provided the ground electrodes 36 and 76 and the water level electrodes 37a-37c and 75 in the inflow tanks 31 and 71 side, and connected the water injection line 41 of the water injection means 40 to the discharge tanks 32 and 72 side. However, conversely, the water injection pipe 41 of the water injection means 40 is connected to the inflow tanks 31 and 71, and the ground electrodes 36 and 76 and the water level electrodes 37a to 37c and 75 are provided to the discharge tanks 32 and 72. It is good. In addition, when it is set as the structure which connected the water injection pipe line 41 to the top | upper surface side of the storage containers 30 and 70 as mentioned above, hot water (water) falls from the top | upper surface side at the time of water injection to the storage containers 30 and 70. It will be. At this time, there is a possibility that drain or the like splashes in the storage containers 30 and 70, the liquid level undulates, and the water level electrodes 37a to 37c and 75 erroneously detect the water level due to this. Therefore, in order to prevent such a problem, the ground electrodes 36 and 76 and the water level electrodes 37a to 37c and 75 are provided on one side of the inflow tanks 31 and 71 and the discharge tanks 32 and 72 as described above, and the other side. It is desirable that the water injection pipe 41 of the water injection means 40 is connected to the water injection means 40.

  The neutralization devices 7 and 60 described above are provided with two tanks of the inflow tanks 31 and 71 and the discharge tanks 32 and 72, respectively, in which drain is stored, but the present invention is not limited to this. For example, another tank (sub-storage part) capable of storing drainage or the like is provided between the inflow tanks 31, 71 and the discharge tanks 32, 72, or upstream of the inflow tanks 31, 71 in the drain flow direction. It is good also as a structure which provided another tank (sub storage part) in the position of the flow direction of a drain with respect to this position and the discharge tank 32,72. Further, even in the case of such a configuration, as described above, when water is poured into the storage containers 30 and 70, drainage or the like splashes in the storage containers 30 or 70, or the liquid level undulates. In order to prevent erroneous detection of the water level, the ground electrodes 36 and 76 and the water level electrodes 37a to 37c are provided in the tank selected from the inflow tanks 31 and 71, the discharge tanks 32 and 72, and one or a plurality of sub reservoirs. 75 is provided, and it is desirable that the water injection pipe 41 of the water injection means 40 is connected to a tank different from this.

  In the said embodiment, although the example which comprised the system | strain for discharging | emitting drain outside by the neutralization apparatus 7 and 60 which can form a water seal state by storing drain or hot water was illustrated, this is this. It is only what showed one embodiment, what formed the drain discharge system provided with the same composition in parts other than neutralization devices 7 and 60, the drain discharge system and neutralization devices 7, 60, etc. A combined configuration may also be used. Moreover, in the said embodiment, although the example which applied the drain discharge system comprised by the neutralization apparatus 7 to what is called a latent-heat recovery type hot water supply apparatus 1 was illustrated, this invention is not limited to this, It is good also as a structure employ | adopted for the type of hot water supply apparatus and apparatus.

  Although the hot water supply device 1 shown in the above embodiment includes the so-called reverse combustion type combustion unit 2, the present invention is not limited to this, for example, a conventionally known vaporization type combustion device. As described above, any type of combustion may be employed, such as a type that burns liquid fuel vaporized or a type of combustion device that burns gas. The hot water supply device 1 is not limited to a type having only a so-called general hot water supply function, but instead of the general hot water supply function, a hot water supply function, a hot water heating function, or a combination of these functions. It may be a machine.

  The above-described hot water supply device 1 does not have a problem that the combustion gas is discharged through the neutralization device 7. Therefore, the hot water supply device 1 can be suitably installed indoors.

It is an apparatus block diagram which shows the structure of the hot water supply apparatus concerning one Embodiment of this invention. It is sectional drawing which shows typically storage conditions, such as a drain, in a storage container, (a) is a state in which a storage container is a full state, (b) is a liquid in an inflow tank in which a reverse wind infiltrates into a storage container. (C) shows a state where automatic water injection to the storage container is unnecessary, and (d) shows a state where almost no drain or the like is accumulated in the storage container. (A), (b) is sectional drawing which shows the modification of a neutralization apparatus, respectively. It is sectional drawing which showed typically flows, such as a drain at the time of draining water of a neutralizer. It is sectional drawing which shows typically the storage states, such as a drain, in the neutralization apparatus concerning a modification, (a) is a state in which a storage container is full, (b) is the liquid level, such as a drain, in a storage container. A state at the drought reference water level, (c) shows a state in which the water seal state is eliminated from the state shown in (b).

Explanation of symbols

1 Hot water supply device (hot water heating device)
2 Combustion section (combustion means)
3 Combustion case (combustion gas passage)
5 Exhaust collecting part 6 Silencer part (exhaust part)
7, 60 Neutralizer 20 Primary heat exchanger 25 Secondary heat exchanger 30, 70 Storage container (storage means)
31, 71 Inflow tank (inflow side storage part)
32,72 Discharge tank (outflow side storage part)
33 Bulkhead 35 Communication 36,76 Ground electrode (Liquid level detection means)
37a to 37c, 75 Water level electrode (liquid level detection means)
38 Drain port 40 Water injection means (liquid replenishment means)
41 Water injection line 42 Valve 43 Orifice (flow rate adjusting means)
45 Flow rate adjusting means 46 Flow rate detecting means 73 Communication part (trap structure part)

Claims (9)

Heat capable of heating hot water or a heat medium by heat exchange between a combustion means for burning fuel, a combustion gas passage through which combustion gas generated by a combustion operation in the combustion means flows, and a combustion gas flowing through the combustion gas passage A drain discharge system for discharging drain generated in a hot water heater provided with an exchange means,
A storage means communicating with the combustion gas passage and capable of storing drain;
Liquid replenishment means capable of replenishing hot water or liquid to the storage means,
The storage means includes an inflow side storage section located on the drain inflow side, an outflow side storage section located on the drain discharge side, and a communication section in which the inflow side storage section and the outflow side storage section communicate with each other. ,
A water-sealed state in which the communication unit is sealed with the liquid stored in the storage unit and the passage of the combustion gas can be prevented by storing the liquid in the storage unit so that the liquid level is equal to or higher than a predetermined liquid level. Is possible, and
When the gas flows from the combustion gas passage side to the storage means side with the combustion operation of the combustion section, pressure acts on the liquid stored in the inflow side storage section, and the liquid level of the inflow side storage section is maximized. Liquid level detection means capable of detecting whether or not the liquid of the storage means is present at the liquid level capable of maintaining the water seal state even in a lowered state,
A drain discharge system in which liquid is replenished to a storage means by a liquid replenishing means until a liquid level equal to or higher than a liquid level at which the presence of the liquid can be detected by the liquid level detecting means. A liquid level detection means capable of detecting the liquid level is provided in any one of the inflow side storage part and the outflow side storage part,
The liquid can be replenished to the reservoir on the other side of the reservoir provided with the liquid level detector by the liquid replenisher based on the water level detected by the liquid level detector. The drain discharge system according to 1. Having a liquid level detection means capable of detecting the liquid level;
The storage means has one or a plurality of sub storage parts communicating with the outflow side storage part,
The liquid level detection means is provided in one reservoir selected from the inflow side reservoir, the outflow side reservoir, and the sub reservoir,
The liquid replenishing means is capable of replenishing a liquid in a storage part different from the storage part provided with the liquid level detection means based on the water level detected by the liquid level detection means. Or the drain discharge system of 2. The communication portion has a trap structure portion that rises upward from the bottom surface side of the inflow side storage portion, and the hot water or the liquid on the inflow side storage portion side enters the trap structure portion, thereby causing water to enter. It can be sealed,
Liquid that flows from the combustion gas passage side to the storage means side and is stored in the inflow side storage portion with respect to a horizontal line passing through the upper end of the opening formed at the connection position of the trap structure portion and the inflow side storage portion Liquid is replenished to the storage means by the liquid replenishment means so that the liquid level in the inflow side storage section reaches a position above the amount of decrease in the liquid level of the inflow side storage section assumed by the pressure acting on The drain discharge system according to any one of claims 1 to 3. The liquid replenishment means is connected to the storage means from the outside, and has a replacement fluid flow path capable of supplying liquid to the storage means,
The drain discharge system according to any one of claims 1 to 4, wherein a flow rate adjusting means having an orifice is provided in the middle of the replacement fluid flow path. The liquid replenishment means is connected to the storage means from the outside, and has a replacement fluid flow path capable of supplying liquid to the storage means,
A flow rate adjusting means is provided in the middle of the replacement fluid flow path,
The flow rate adjusting means includes a flow rate adjusting valve and a flow rate detecting means, and the opening degree of the flow rate adjusting valve is adjusted based on the flow rate of the liquid detected by the flow rate detecting means. The drain discharge system according to any one of claims 1 to 5.   A neutralization apparatus comprising the drain discharge system according to any one of claims 1 to 6 and capable of neutralizing and discharging the drain.   A drain discharge system according to any one of claims 1 to 6, wherein a drainage opening is provided at the bottom of the storage means, and a liquid discharge path for discharging liquid from the storage means through the drainage opening. A neutralizing device, characterized in that a neutralizing agent capable of neutralizing drain is disposed in the middle. Combustion means for burning fuel;
A combustion gas passage through which combustion gas generated in association with the combustion operation in the combustion means flows;
Heat exchange means capable of heating hot water or a heat medium by heat exchange with the combustion gas flowing through the combustion gas passage;
A hot water heater comprising the drain discharge system according to any one of claims 1 to 6, or the neutralization device according to claim 7 or 8.

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