JP6118536B2 - Drain neutralizer and combustion apparatus equipped with the drain neutralizer - Google Patents

Description

  The present invention relates to a drain neutralizer for neutralizing drain generated in a latent heat recovery heat exchanger and a combustion apparatus equipped with the drain neutralizer.

  FIG. 8 shows a conventional example of a bath apparatus installed in a bathroom. In this conventional bath apparatus, a bathtub 26 and a balance bath 45 are provided side by side in a bath installation space 52, and a supply / exhaust tube 50 of the balance bath 45 is installed in a wall hole 16 of the bathroom wall 10. However, when the balance bath 45 and the bathtub 26 are arranged in parallel in the relatively small bath installation space 52 as described above, the bathtub 26 must be made small in size, so that the bathtub 26 is bathed in a tight posture. I had to do it and I couldn't enjoy bathing in a relaxed mood.

  Therefore, at the time of replacement of the balance bath 45, the user purchases, for example, a water heater having an automatic hot water filling function as a combustion device instead of the balance bath 45, and as shown in FIG. The chamber 17 is fitted and installed in the wall hole 16 where the air supply / exhaust tube 50 has been installed so far, and the bathtub 26 that is as large as the space of the balance bath 45 is installed in the bath installation space 52 to improve the living environment. It has been done. In addition, the code | symbol 18 in FIG. 7 shows the mixing faucet attached to the apron of the bathtub 26. FIG.

  Various configurations of such a water heater have been proposed and put into practical use, and an example thereof is schematically shown in FIG. In the figure, a burner 1 is arranged in a combustion chamber 20 provided in a case (instrument case) 40, and a combustion fan 5 for supplying and exhausting combustion of the burner 1 is provided in the case 40. As shown by the arrow in FIG. 6, the water heater 17 sends air (combustion air) sucked from the outside by rotation of the combustion fan 5 to the burner 1 through the blower chamber 25, and this air and the gas pipe The burner 1 is combusted by the gas supplied to the burner 1 (not shown), and the combustion gas generated by the combustion of the burner 1 is discharged from the combustion chamber 20 by the rotation of the combustion fan 5. Send to 8 side and exhaust.

  Above the burner 1, a main heat exchanger (primary heat exchanger) 4 that recovers sensible heat in the combustion gas of the burner 1, and a flow of the combustion gas downstream from the main heat exchanger 4. Latent heat recovery heat exchangers (secondary heat exchangers) 6 that are provided on the side and recover sensible heat and latent heat of the combustion gas are arranged side by side with a space therebetween.

  For simplification of the drawing, although not shown in the drawing, a water supply pipe for leading water from the water supply source to the latent heat recovery heat exchanger 6 is provided on the inlet side of the latent heat recovery heat exchanger 6. Are connected, and the outlet side of the latent heat recovery heat exchanger 6 and the inlet side of the main heat exchanger 4 are connected via a connecting pipe. A hot water supply pipe is connected to the outlet side of the main heat exchanger 4. Normally, the water supply pipe includes a water thermistor that detects the temperature of water supplied from the water supply pipe and flows into the latent heat recovery heat exchanger 6, and a water amount sensor that detects the flow rate of water flowing into the latent heat recovery heat exchanger 6. The hot water supply pipe is provided with a hot water thermistor that can detect the temperature of the hot water flowing out.

  When a hot water filling pipe is connected to the hot water supply pipe so that the hot water filling can be performed on the bathtub 26, a hot water heater 17 capable of automatic hot water filling to the bathtub 26 can be formed. If a bathtub hot water replenishment function is provided, a composite water heater capable of retreating a bathtub can be formed. In addition, in FIG. 6, the code | symbol 30 has shown the bathroom, Although various things are proposed as the said automatic hot water filling structure and the reheating composition of bathtub hot water, it is well-known and the detailed description is here. Is omitted.

  In the water heater 17, the combustion control of the burner 1 is performed according to a sequence program determined in advance by a combustion control means (not shown), and the high-temperature combustion gas generated by the combustion of the burner 1 is the upper side of the burner 1. In this example, the main heat exchanger 4 enters the arrangement area side of the latent heat recovery heat exchanger 6 from the horizontal direction side. And the combustion gas which passed the arrangement | positioning area | region of the heat exchanger 6 for latent heat collection | recovery is exhausted from the exhaust port 8 side.

  Then, while the combustion gas passes through the main heat exchanger 4, heat exchange is performed between the combustion gas and water supplied to the main heat exchanger 4, and sensible heat of the combustion gas is recovered. . Further, while the combustion gas that has passed through the main heat exchanger 4 passes through the latent heat recovery heat exchanger 6, heat exchange is performed between the combustion gas and water supplied to the latent heat recovery heat exchanger 6. Thus, the sensible heat and latent heat of the combustion gas are recovered.

  The latent heat recovery of the combustion gas by the latent heat recovery heat exchanger 6 is performed by bringing the combustion gas containing water vapor into contact with the low temperature heat transfer surface below the saturation temperature to condense the water vapor in the combustion gas. That is, it recovers the latent heat of condensation that occurs when water vapor condenses, and usually recovers the enthalpy of the water vapor of the combustion gas that is discharged out of the combustion system such as a water heater as the combustion gas. is there.

  Thus, in the water heater 17 provided with the latent heat recovery heat exchanger 6, when the combustion gas generated by the combustion of the burner 1 passes through the latent heat recovery heat exchanger 6, the water pipe in the latent heat recovery heat exchanger 6. The water passing through the steam takes away the latent heat possessed by the water vapor in the combustion gas (recovers the latent heat) to increase the temperature, and further heats with the combustion thermal power of the burner 1 when passing through the main heat exchanger 4 Since hot water having a set temperature is produced, the burner 1 can perform efficient heating. That is, by providing the latent heat recovery heat exchanger 6, for example, in the water heater 17, the thermal efficiency reaches about 90% or more, for example, 95% on a high heating value (total heating value) basis. Higher thermal efficiency is achieved as compared to a normal water heater without the exchanger 6.

  In the combustion apparatus such as the hot water heater 17 equipped with the latent heat recovery heat exchanger 6, acidic drain (drain condensate) generated in the latent heat recovery heat exchanger 6 is recovered, neutralized, and discharged. In this example, drain recovery means (drain tray in this figure) 43 for recovering drain is provided below the latent heat recovery heat exchanger 6 so that drain can be recovered. In order to place the combustion device in the wall hole 16 of the bathroom wall 10, the height of the combustion device must be reduced. For this reason, it is difficult to provide a drain neutralizer in the case 40 that can appropriately neutralize the drain during the period of use of the combustion apparatus, for example, 10 years, and the drain neutralizer is provided outside the case 40 and connected. The structure which connects to the case 40 via a tool and neutralizes the drain recovered by the drain recovery means 43 to the drain neutralizer outside the case 40 has been proposed (see, for example, Patent Document 1). .

JP 2008-275296 A

  By the way, since the drain is generated as a result of taking the heat of the combustion exhaust gas by the latent heat recovery heat exchanger 6, the drain is generated in the region where the latent heat recovery heat exchanger 6 is provided (the exhaust top close to the exhaust port 8. Side). Therefore, in order to introduce the drain into the drain neutralizer by the natural fall at the shortest distance, the drain neutralizer is disposed on the lower side of the latent heat recovery heat exchanger 6 (for example, the position indicated by C in FIG. 6). Desirably, this location is the lower tip of the combustion device.

  However, the drain neutralizer that has been used conventionally has a weight of about 2 kg combined with the container and the neutralizer of the drain and is heavy, and the drain is neutralized by accumulating the drain in the neutralizer filling area. Since the drain neutralizer always accumulates about 1 kg of drain in the drain neutralizer, the total weight is 3 kg. Therefore, this heavy drain neutralizer is placed at the lower end of the combustion device. If provided, a large stress (see arrow F) based on the lever principle is applied to the case 40 of the combustion apparatus. For this reason, the case 40 needs to be remarkably increased in strength, resulting in an increase in cost.

  The present invention has been made in order to solve the above-described problems. The object of the present invention is to provide a combustion apparatus case for which there is no need to significantly increase the strength of the combustion apparatus case even if it is provided at the lower end of the combustion apparatus. It is an object of the present invention to provide a drain neutralizer capable of suppressing an increase in cost and a combustion apparatus using the neutralizer.

In order to achieve the above object, the present invention has the following configuration as means for solving the problems. That is, the drain neutralizer according to the first aspect of the invention introduces a drain introduction part for introducing drain generated by the latent heat recovery heat exchanger for recovering the exhaust heat of the burner, and the drain introduced from the drain introduction part passes therethrough. A drain passage chamber; and a drain outlet portion for leading the drain that has passed through the drain passage chamber to the outside. The drain passage chamber is provided in communication with the drain inlet portion, and the latent heat recovery heat exchanger An exhaust water sealing chamber that seals exhaust gas flowing together with the drain from the side by drain, and a drain neutralization chamber that is provided in communication with the water sealing chamber and neutralizes the drain flowing from the water sealing chamber The drain neutralization chamber is filled with a plurality of solid neutralizing agents through gaps, and a bottom wall side of the drain neutralization chamber is provided with a passage wall rising from the bottom surface side, The drain is a bottom surface of the drain neutralization chamber By passing through the region along the direction of extension of the passage wall, a drain passage passage is formed which passes while meandering the bottom side of the drain neutralization chamber, and the bottom surface of the drain passage passage passes through the drain passage passage. The drain neutralization chamber is formed so that the downstream side is lower than the upstream side through which the water flows, and the drain introduced into the drain passage chamber passes through the water seal chamber and then passes through the drain passage passage. When the water passes through the bottom side of the water, the water is neutralized by the neutralizing agent and led to the outside from the drain outlet, and the water sealing chamber and the drain neutralizing chamber are the drain passage chamber. and from the bottom are floor plan arranged side by side in the horizontal direction by the standing barrier rib formed upward, the drain flow direction of the passage width of the drain passage path, the drain passage passage Along which a means for solving the problems with the arrangement towards the downstream side than the upstream side flows the drain is continuously or stepwise formed so as to wider.

Further, the drain neutralizer according to the second aspect of the invention includes, in addition to the configuration of the first aspect, the bottom side of the drain neutralization chamber from the bottom side of the drain neutralization chamber in a direction crossing the longitudinal direction of the passage wall. A standing obstacle wall is provided, and drainage passes between the obstacle wall and the passage wall while meandering.

Furthermore, the combustion apparatus of the third invention is provided with a burner, a latent heat recovery heat exchanger for recovering the exhaust heat of the burner, and a first or a first heat exchanger in a case installed in a wall hole formed in the bathroom wall. 2 drain neutralizers are provided.

  According to the drain neutralizer of the present invention, the drain generated by the latent heat recovery heat exchanger that recovers the exhaust heat of the burner is introduced from the drain introduction part into the drain passage chamber and passed through the drain lead-out part. However, the drain passage chamber is provided in communication with the drain introduction portion and has an exhaust water sealing chamber for sealing the exhaust gas flowing together with the drain from the latent heat recovery heat exchanger side with the drain. Therefore, the exhaust gas can be sealed with water, and the exhaust gas can be prevented from being led to the outside through the drain neutralizer.

  In the drain neutralizer of the present invention, the drain passage chamber has a drain neutralization chamber communicating with the water seal chamber, and a plurality of solid neutralizing agents for neutralizing the drain are contained in the drain neutralization chamber. The drain neutralization chamber is filled with a gap between each other, but the drain neutralization chamber is not configured to store and neutralize the drain as in the conventional drain neutralizer, but the drain passes through the drain formed in the drain neutralization chamber. Unlike the configuration in which the drain is stored and neutralized because the neutralization is performed when passing through the passage, passing through the gap between the neutralizing agents, and passing through the drain neutralization chamber, Can be prevented from becoming heavy.

  In the drain neutralizer of the present invention, a passage wall standing from the bottom surface side is provided on the bottom surface side of the drain neutralization chamber, and the drain extends through the bottom surface side region of the drain neutralization chamber. By passing along the direction, a drain passage passage is formed that passes through the bottom surface side of the drain neutralization chamber while meandering, and the bottom surface of the drain passage passage is downstream of the upstream side through which the drain flows through the drain passage passage. An inclination is formed so that the side becomes a low position, and the drain introduced into the drain passage chamber passes through the water seal chamber and then meanders the bottom side of the drain neutralization chamber through the drain passage passage. pass.

  In other words, in a configuration in which the drain passes in the height direction as in the conventionally used drain neutralizer, the drain flows fast because gravity is applied to the drain, so that the drain is neutralized with the neutralizing agent. However, in the present invention, as described above, the drain slowly flows through the drain passage passage while meandering the bottom surface of the drain neutralization chamber (for example, zigzag). Therefore, by passing the drain passage formed in a meandering manner in a substantially horizontal direction, the drain is neutralized sufficiently (appropriately) by the neutralizing agent even if the drain neutralizer is low. be able to.

  Therefore, even if the height of the combustion device is low, the drain neutralizer can be provided in the case of the combustion device, and the weight of the drain neutralizer can also be lighter than conventionally used drain neutralizers. . In addition, in the conventional drain neutralizer configured to seal the drain with the drain while accumulating the drain, a partition extending from the upper side to the lower side of the drain neutralizer having a high height is required. However, in the present invention, since no partition is required in the drain neutralization chamber, the weight of the partition can be reduced, and a neutralizing agent can be added to the partition space. Since it can be filled, the drain neutralizer can be further miniaturized.

  And even if such a small and light drain neutralizer is provided on the lower end side in the case of the combustion device, it is possible to suppress the stress based on the lever principle from being applied to the case of the combustion device. There is no need to make the case much stronger, and the cost of the combustion apparatus can be prevented from increasing.

  Note that, for example, in a combustion apparatus provided outdoors, when the wind is too strong, a function of automatically stopping burner combustion in the combustion apparatus is often provided. In such a combustion apparatus, the wind is strong. If it is too much, drainage will not occur. Even in such a combustion apparatus, in the drain neutralizer configured to accumulate drain as in the prior art, the drain accumulated before the burner combustion stop is in a state accumulated in the drain neutralizer, which is heavy. , The stress due to the drain neutralizer and the stress due to the strong wind are applied to the combustion device. However, when the present invention is applied, if the wind is too strong, no drain is generated, so the inside of the drain neutralization chamber The neutralizer is in a dry state, and the drain neutralizer can make the drain generated by burner combustion even lighter than when it passes through the drain neutralization chamber, so the stress on the case of the combustion device is further reduced. Because it can, even if the wind is too strong, it will not cause any trouble.

In addition, when the liquid flows, since the size in the width direction (direction intersecting the flow direction) tends to become wider toward the downstream side, the passage through which the liquid flows is more downstream than the upstream side of the flow. It is easier to flow smoothly if the passage width is wide. Therefore, drain neutralizer of the present invention, the direction of the passage width drainage flow of the drain passage passage, downstream side continuously or stepwise wider towards the upstream side through which the drain along the drain passage passage formed to so as to, it is possible to perform more efficiently neutralize the drain than neutralizing the drain through the drain passage path of the drain in the Japanese style.

  Further, in the drain neutralizer, an obstacle wall standing from the bottom surface side of the drain neutralization chamber is provided in an area on the bottom surface side of the drain neutralization chamber in a direction crossing a longitudinal direction of the passage wall, and the obstacle wall and the passage wall are provided. If the drain is formed so that it passes while meandering, the path through which the drain passes can be made longer, and the neutralization of the drain with the neutralizing agent can be performed even better.

  Furthermore, by installing the combustion apparatus of the present invention in a wall hole formed in the bathroom wall instead of the balance bath, for example, the bath space can be used effectively. In addition, the combustion apparatus of the present invention can be an inexpensive combustion apparatus in which an increase in cost is suppressed, and can also perform combustion with high efficiency by including a latent heat recovery heat exchanger. Drain generated in the heat exchanger for recovery can be efficiently neutralized by the drain neutralizer, and the exhaust gas flowing with the drain can be sealed with water, making it an excellent combustion device that can be used safely and comfortably. It can be.

  The combustion device provided in the wall hole of the bathroom is a horizontal type combustion device whose lateral length is larger than the height. In such a combustion device, the burner is burned into the device from the outside of the device. The intake port for introducing the air is often provided on the lower side of the heat exchanger for recovering latent heat, and in the area where the intake port is disposed, rain or the like is prevented from entering the combustion device. Although a rain protection plate is provided, if the drain neutralizer of the present invention is provided on the lower side of the latent heat recovery heat exchanger and is arranged near the intake port, the drain neutralizer container causes rain from the intake port. Etc. can be prevented from entering the apparatus, and it is also possible to omit the rain-preventing plate, thereby simplifying the apparatus.

The perspective view (a) which shows typically one Example of the drain neutralizer which concerns on this invention, and the typical perspective view which shows the drain neutralizer from the figure which looked from the direction of arrow A (from the diagonally upper side) (B). It is explanatory drawing (a) which shows the drain passage operation | movement of the drain neutralizer of the Example shown in FIG. 1 with a top view, and B-B 'sectional drawing (b) of FIG.1 (b). It is typical plane explanatory drawing which shows the structure and drain passage operation | movement of the other Example of the drain neutralizer which concerns on this invention. It is a typical system figure which shows one Example of the combustion apparatus provided with the drain neutralizer which concerns on this invention. It is the figure which looked at part of the case wall through the example of the combustion apparatus provided with the drain neutralizer according to the present invention. It is typical explanatory drawing for demonstrating the system structural example of the combustion apparatus provided with the conventional heat exchanger for latent heat collection | recovery. It is explanatory drawing which shows the bathroom structure which removed the balance bath and installed the large bathtub only in the installation space in the bath installation space. It is explanatory drawing which shows the bathroom structure which provided the balance bath pot and the bathtub side by side in the bath installation space.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the description of the present embodiment, the same reference numerals are assigned to the same names as those in the conventional example, and the duplicate description is omitted or simplified.

  FIG. 1 is a schematic perspective view showing an embodiment of a drain neutralizer according to the present invention. The drain neutralizer 2 is formed of, for example, a resin such as polypropylene. As shown in the figure, the drain neutralizer 2 introduces drain that is generated in the heat exchanger 6 for recovering latent heat of the combustion apparatus, and the drain. It has a drain passage chamber 7 through which the drain introduced from the introduction portion 3 passes, and a drain outlet portion 9 for leading the drain that has passed through the drain passage chamber 7 to the outside. The upper side of the drain passage chamber 7 is an opening, and the length L in FIG. 1A is 18 cm, the length W is 11 cm, and the height H is 11 cm. In addition, the magnitude | size of the drain neutralizer 2 is not limited to these values, It sets suitably.

  The drain passage chamber 7 has an exhaust water sealing chamber 11 and a drain neutralization chamber 12 provided in communication with the water sealing chamber 11. The partition walls 13 are formed so as to stand upward from the bottom surface of the passage chamber 7 and are arranged next to each other in the horizontal direction. The height of the partition wall 13 is, for example, 7 cm. The water seal chamber 11 is provided in communication with the drain introduction part 3 and is an exhaust water seal chamber for sealing the exhaust gas flowing together with the drain from the latent heat recovery heat exchanger 6 side with the drain. The neutralization chamber 12 is a neutralization chamber that neutralizes the drain that flows from the water seal chamber 11.

  The drain neutralization chamber 12 is filled with a plurality of solid neutralizing agents (not shown in FIG. 1) formed of, for example, calcium carbonate at intervals. In addition, the kind etc. of a neutralizing agent are not specifically limited, It sets suitably. As shown in FIG. 2B, a filter portion 33 (for example, a mesh-like plate) 33 through which the drain passes but the neutralizing agent 34 does not pass is inserted into the slit 32 shown in FIG. 1B. In order to prevent the neutralizing agent 34 filled up to the height (11 cm) of the drain neutralizing chamber 12 in a state where the interior of the Japanese chamber 12 is filled, from entering the water sealed chamber 11 beyond the partition wall having a height of about 7 cm. It is configured. 2B shows a state in which the drain is sealed by the water seal chamber 11, a drain passage pipe 35 connecting the drain recovery means 43 (see FIGS. 4 and 6) and the drain neutralizer 2. The shaded portion in the figure is a state filled with drain. Moreover, although the neutralizing agent 34 is filled so that the drain neutralization chamber 12 may be filled, only a part is shown.

  Further, as shown in FIG. 1, a passage wall 14 having a height of, for example, 5 cm standing from the bottom surface side is provided on the bottom surface side of the drain neutralization chamber 12, and the drain is located on the bottom surface side of the drain neutralization chamber 12. Drain passage passages 15 (15a, 15b, 15c) are formed which pass through the region along the extending direction of the passage wall 14 while meandering the bottom surface side of the drain neutralization chamber 12. The bottom surface of the drain passage 15 is inclined so that the downstream side is lower than the upstream side through which the drain flows through the drain passage 15.

  Then, as shown by the arrow in FIG. 2A, the drain introduced into the drain passage chamber 7 passes through the water seal chamber 11 and then passes through the drain passage passage 15 to move the bottom surface side of the drain neutralization chamber 12. When passing while meandering, it is neutralized by the neutralizing agent and led out from the drain lead-out portion 9. The drain passage passage 15 has a width of the drain passage passage 15a <the width of the drain passage passage 15b <the width of the drain so that the downstream side is wider than the upstream side along which the drain flows along the drain passage passage 15. The width of the passage 15c is formed.

  FIG. 4 shows an embodiment of a combustion apparatus (hot water heater 17) provided with the drain neutralizer 2 of this embodiment in a schematic system configuration diagram. FIG. 5 shows this hot water heater. 17 shows a partial cross-sectional structure. This water heater 17 is installed in the wall hole 16 formed in the bathroom wall 10, for example, as in the conventional example, and in the case 40, the burner 1, the combustion fan 5, the main heat exchanger 4, and the heat for latent heat recovery. Although the exchanger 6 is provided, in this embodiment, the drain neutralizer 2 shown in FIG. 1 is further provided in the case 40. The drain neutralizer 2 is provided outside the combustion chamber 20 below the latent heat recovery heat exchanger, and is disposed in the vicinity of the intake port 19. In FIG. 4, the drain neutralizer 2 is shown using the cross-sectional view shown in FIG. 2B, and therefore the drain outlet 9 of the drain neutralizer 2 is not shown. For example, the drain outlet 9 is disposed on the front side of the figure, and the drain that has passed through the drain neutralizer 2 is led out of the case 40.

In addition, this invention is not limited to the said Example, Various aspects can be taken. For example, in the above embodiment, the drain passage 15 of the drain neutralization chamber 12 is formed so that the downstream side becomes wider stepwise than the upstream side along which the drain flows. The drain passage 15 may be formed so that the downstream side is continuously wider than the upstream side where the drain flows . Further, as a reference example , all the widths may be the same, and as a reference example, the width is appropriately set.

  Further, for example, as shown in FIG. 3, an obstacle wall 21 erected from the bottom surface side of the drain neutralization chamber 7 is provided in the region on the bottom surface side of the drain neutralization chamber 7 in a direction crossing the longitudinal direction of the passage wall 14. As indicated by the arrows in the figure, the drain may pass between the obstacle wall 21 and the passage wall 14 while meandering.

  Furthermore, although the upper side of the drain passage chamber 7 is opened in the above embodiment, for example, a lid may be provided to prevent dust or the like from entering the drain passage chamber 7 from the upper side. In order to reduce the weight of the drain neutralizer 2, the lid may be a mesh-like or slit-formed one, a film-like lid, or a plate-like lid. It is preferable to make the thickness thin.

  Furthermore, although the said Example demonstrated the gas combustion type water heater 17 as a combustion apparatus, if the combustion apparatus of this invention is not restricted to a water heater and has a heat exchanger for latent-heat recovery, it will be a bath. An appropriate combustion device such as a kettle can be applied. Also, the combustion method may be an oil combustion type, and the system configuration of the combustion apparatus is not particularly limited, and is set as appropriate.

  Furthermore, although the example which installed the water heater 17 in the wall hole 16 of the bathroom 30 was described in the said Example, the arrangement position of combustion apparatuses, such as the water heater 17, etc. is set suitably.

  The present invention can form a lightweight drain neutralizer, and even if the drain neutralizer is provided at the lower end of the tip of the combustion device, it is not necessary to significantly increase the strength of the case of the combustion device, thereby reducing the cost of the combustion device. Therefore, for example, it can be applied to a household combustion apparatus.

DESCRIPTION OF SYMBOLS 1 Burner 2 Drain neutralizer 3 Drain introduction part 4 Main heat exchanger 5 Combustion fan 6 Heat exchanger for latent heat recovery 7 Drain passage room 9 Drain outlet part 10 Bathroom wall 11 Water seal room 12 Drain neutralization room 13 Bulkhead 14 Passage Wall 15 Drain passage 16 Wall hole 21 Obstacle wall 26 Bathtub 40 Case

Claims (3)

A drain introduction part for introducing drain generated in a heat exchanger for recovering latent heat of the burner, a drain passage chamber through which the drain introduced from the drain introduction part passes, and a drain that has passed through the drain passage chamber The drain passage chamber is provided in communication with the drain introduction portion, and the exhaust gas flowing together with the drain from the latent heat recovery heat exchanger side is drained by the drain. An exhaust water sealing chamber for sealing, and a drain neutralizing chamber that is provided in communication with the water sealing chamber and neutralizes the drain flowing from the water sealing chamber. The solid neutralizing agent is filled with a gap between each other, and a passage wall standing from the bottom surface side is provided on the bottom surface side of the drain neutralizing chamber, and the drain passes through the bottom surface side region of the drain neutralizing chamber. Pass along the extension direction of the passage wall As a result, a drain passage passage that passes while meandering the bottom surface side of the drain neutralization chamber is formed, and the bottom surface of the drain passage passage is positioned lower on the downstream side than the upstream side through which the drain flows through the drain passage passage. And when the drain introduced into the drain passage chamber passes through the drain passage and passes through the drain passage passage while meandering the bottom side of the drain neutralization chamber. The water sealing chamber and the drain neutralizing chamber are neutralized by a neutralizing agent and led out to the outside from the drain outlet, and the water sealing chamber and the drain neutralizing chamber are horizontally formed by a partition wall that stands upward from the bottom surface of the drain passage chamber. are floor plan arranged side by side in the direction, the drainage flow direction of the passage width of the drain passage passages, than the upstream side of the drain flows along the drain passage passage Drain neutralizer, wherein the direction of flow side is continuously or stepwise formed so as to wider. In the region on the bottom side of the drain neutralization chamber, an obstacle wall is provided standing from the bottom side of the drain neutralization chamber in a direction crossing the longitudinal direction of the passage wall, and the drain meanders between the obstacle wall and the passage wall. drain neutralizer of claim 1 Symbol mounting, characterized in that it is formed so as to pass while. In the installed case the wall hole formed in the bathroom walls, and the burner, and a latent heat recovery heat exchanger for recovering exhaust latent heat of the burner, a drain neutralizer of claim 1 or claim 2 Symbol placement Is provided with a combustion apparatus.

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