JP5110354B2 - Drain discharge system, neutralizer, and hot water heater - Google Patents

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 high acidity and corrosivity. 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.

  In view of this, the present inventors have provided a storage means having an inflow tank and an exhaust tank communicating with each other on the bottom side, and hot water or liquid for this in order to prevent leakage of the combustion gas generated during the combustion operation. A liquid replenishing means that can be replenished, and having a structure that can be in a water-sealed state by storing a liquid such as a drain in the liquid replenishing means has been studied. In such a configuration, when a gas such as combustion gas flows into the inflow tank of the storage means during the combustion operation, the liquid level on the inflow tank side decreases and the liquid level on the discharge tank side rises accordingly. It is assumed that the liquid is discharged from the discharge tank side.

  Here, in a known hot water heater, when the combustion state becomes abnormal (hereinafter also referred to as abnormal combustion state), the wind pressure is detected by utilizing the fact that the reverse wind pressure of the exhaust part flowing through the combustion gas passage becomes high. Some have a wind pressure sensor or the like. In the case of such a configuration, there are problems that the manufacturing cost of the hot and cold water heating device is increased by the provision of the wind pressure sensor and the device configuration becomes complicated.

  Further, the combustion gas passage is a portion through which the combustion gas passes and is therefore a portion that tends to become high temperature. Therefore, in the case where the wind pressure sensor is provided in the combustion gas passage, there is a problem that the wind pressure sensor may easily deteriorate over time or break down.

  Accordingly, in order to solve the above-described problems, the present invention is a drain discharge system that has a simple apparatus configuration, can accurately determine whether or not it is in an abnormal combustion state, and has a low risk of failure or the like. The purpose was to provide a Japanese apparatus and a hot water heater.

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 means capable of replenishing the liquid with respect to the storage means, wherein the storage means is an inflow side storage section located on the drain inflow side, an outflow side storage section located on the drain discharge side, A communication portion in which the inflow side storage portion and the outflow side storage portion communicate with each other, and a liquid level detection means capable of detecting a liquid level in the storage portion, so that the liquid level in the storage means is equal to or higher than a predetermined liquid level. To store liquid Thus, the communication portion is sealed with the liquid stored in the storage means, and can be in a water-sealed state capable of preventing the passage of combustion gas, and the liquid level detected by the liquid level detection means Based on this, the liquid replenishing means can replenish the storage means with liquid, and the position of the liquid level when the combustion means is in the combustion operation and the liquid level before the combustion means starts the combustion operation. The drain discharge system is characterized in that it can be determined that the combustion state of the combustion means is abnormal on the condition that the difference from the position exceeds a predetermined range.

  In the drain discharge system of the present invention, since the storage means communicates with the combustion gas passage, the storage means is affected by the generation state of the combustion gas such as the wind speed and the air volume of the combustion gas flowing through the combustion gas passage and is stored in the storage means. The liquid level of the drain, etc. that is changing. Further, the amount of fluctuation of the liquid level fluctuates reflecting the generation state of the combustion gas flowing through the combustion gas passage. Based on such characteristics, in the drain discharge system of the present invention, it is determined that the combustion state is abnormal on the condition that the fluctuation of the liquid level in the storage means before and after the start of the combustion operation exceeds a predetermined range. . Therefore, in the drain discharge system of the present invention, it is possible to detect whether or not the combustion state is abnormal without separately providing a pressure sensor or the like as in the conventional hot water heater. Therefore, according to the drain discharge system of the present invention, it is possible to accurately determine whether or not the combustion state is abnormal while the configuration is simple.

  Further, since the drain discharge system of the present invention monitors fluctuations in the liquid surface position in the storage means in which drain or the like is stored, the sensor or the like is exposed to a position exposed to a high temperature like a conventional pressure sensor. There is no need to provide a member. Therefore, according to the present invention, it is possible to provide a drain discharge system that not only can accurately determine whether or not the combustion state is abnormal, but also has fewer problems such as failure due to exposure to high-temperature combustion gas.

  According to the second aspect of the present invention, when the combustion state of the combustion means is normal, the position of the liquid level when the combustion means is in the combustion operation and the liquid level before the combustion means starts the combustion operation. The difference between the position of the liquid level when the combustion means is in the combustion operation and the position of the liquid level before the combustion means starts the combustion operation, assuming that the maximum value of the difference from the position is the maximum fluctuation range However, it is possible to determine that the combustion state of the combustion means is abnormal on the condition that the maximum fluctuation range is exceeded, the drain discharge system according to claim 1.

  According to such a configuration, it is possible to provide a drain discharge system that can accurately grasp whether or not the combustion state is abnormal.

  In the drain discharge system according to the second aspect, the maximum fluctuation range is the maximum value of the pressure acting on the liquid level in the storage means due to the influence of the combustion gas generated by the combustion operation of the combustion section, and the combustion section Based on the maximum value of the pressure acting on the liquid level in the storage means due to the influence of the back wind flowing into the combustion gas passage by exposing the hot water heating device to the back wind of the maximum wind speed within the allowable range of combustion operation It may be characterized by being set (Claim 3).

  According to such a configuration, it is possible to provide a drain discharge system that can more accurately grasp whether or not the combustion state is abnormal.

  In the invention according to claim 4, the gas flows from the combustion gas passage side to the storage means side, so that pressure acts on the liquid stored in the inflow side storage portion and the liquid level of the inflow side storage portion is lowered. The drain discharge according to any one of claims 1 to 3, wherein the storage means is replenished with liquid by the liquid replenishment means so as to be equal to or higher than a water injection reference liquid level capable of maintaining the water seal state in a state. It is a system.

  According to such a configuration, it is possible to provide a drain discharge system that can reliably maintain a water-sealed state even if a combustion failure occurs and the liquid level in the storage means varies greatly.

  According to the fifth aspect of the present invention, the liquid level detection means is provided in either the inflow side storage section or the outflow side storage section, and the liquid replenishment means is based on the liquid level detected by the liquid level detection means. 5. The drain discharge system according to claim 1, wherein a liquid can be replenished to a storage portion on a side where the liquid level detection means is not provided.

  Moreover, the invention according to claim 6 provided based on similar findings is that the storage means has one or a plurality of sub storage parts communicating with the outflow side storage part, and the liquid level detection means The liquid replenishing means based on the liquid level detected by the liquid level detecting means, provided in one reservoir selected from the inflow side reservoir, the outflow side reservoir, and the sub reservoir. The drain discharge system according to any one of claims 1 to 4, wherein a liquid can be replenished to a storage part different from the storage part provided with the detection means.

  In the case of adopting the configuration as in the above-described fifth or sixth aspect, even if the liquid splashes when the liquid is replenished by the liquid replenishing means, the liquid splashed at the time of replenishment directly reaches the liquid level detecting means. The possibility of adhering to is low. Further, when the above-described configuration is adopted, 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. This makes it difficult for the liquid level to be erroneously detected. Therefore, if the structure of the said Claim 4 or Claim 5 is employ | adopted, it will grasp | ascertain correctly the quantity of the liquid currently stored by the storage part, and it will become a quantity suitable for forming a water seal state. A drain discharge system capable of adjusting the replenishment amount of the liquid can be provided.

  Moreover, if the structure of the said Claim 5 or Claim 6 is employ | adopted, a liquid level will be stabilized in a short time in the storage part by which the liquid level detection means is installed at the time of the replenishment of the liquid to a storage means. Therefore, according to the configuration described above, the liquid level detection process can be completed in a short time.

  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.

  The neutralization apparatus of the present invention has the above-described drain discharge system configuration. Therefore, according to the neutralization device of the present invention, the combustion state can be accurately grasped based on the fluctuation of the liquid level in the storage means.

  According to an eighth aspect of the present invention, there is provided heat exchange between a combustion means for burning fuel, a combustion gas passage through which combustion gas generated by the 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 are provided. It 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, it is possible to accurately grasp whether or not the combustion operation is abnormal. Further, in the hot water heating apparatus of the present invention, 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, and the combustion gas is connected to the drain discharge system and the neutralizing device. Can be prevented from being discharged.

  According to the ninth aspect of the present invention, the drain discharge system or the neutralization device communicates with the combustion gas passage, and the inflow side storage portion and the outflow side storage portion of the drain discharge system or neutralization device are connected via the communication portion. On the condition that the liquid level has reached the liquid level that can maintain the water seal even if the liquid level in the inflow side storage part or the outflow side storage part is reduced to the maximum by the combustion operation. The combustion operation can be performed, and the combustion operation is prohibited under a condition that the liquid level in the storage means falls below a liquid level set for detecting abnormal combustion during the combustion operation. Item 9. The hot water heater according to Item 8.

  According to such a configuration, it is possible to accurately detect whether or not the combustion state in the combustion means is abnormal.

  The invention according to claim 10 is provided with a liquid level detecting means capable of detecting the liquid level in the inflow side reservoir, and the fluctuation range of the liquid level which fluctuates with the combustion operation when the combustion state is normal. The liquid level detected by the liquid level detection means is stored in the inflow side storage section by gas flowing from the combustion gas passage side to the storage means side. A position shifted to the lower side more than the normal liquid level fluctuation range with respect to the water injection reference liquid level capable of maintaining the water seal state in a state where the liquid level of the inflow side reservoir is lowered due to pressure acting on the liquid being The hot water heater according to claim 8 or 9, wherein the combustion means is in a combustion prohibited state on condition that

  In the hot water heater of the present invention, the liquid level in the inflow side reservoir is detected by the liquid level detecting means. Further, in the hot water heater of the present invention, since the inflow side reservoir is in communication with the combustion gas passage, the liquid level in the inflow side reservoir is excessively reduced when the combustion means is in an abnormal combustion state. That is, when the combustion state becomes an abnormal combustion state, the liquid level is lowered to a position shifted downward from the reference water level for water injection by more than the normal liquid level fluctuation range.

  Based on such knowledge, in the hot water heating apparatus of the present invention, the combustion means is provided on the condition that the liquid level in the inflow side storage section is shifted to the lower side with respect to the water injection reference liquid level by more than the normal liquid level fluctuation range. Is in a combustion-inhibited state. Therefore, in the hot water heater of the present invention, it is possible to reliably prevent the combustion operation from continuing when the combustion state is abnormal.

  In the invention according to claim 11, the combustion prohibited state is set on condition that the liquid level in the storage means has reached the water injection reference liquid level after the combustion means is in a combustion prohibited state where the combustion operation cannot be performed. The hot and cold water heating device according to claim 10, wherein the hot water heating device is released.

  According to this configuration, it is possible to reliably prevent the combustion operation from being performed in a situation where the storage means is not in the water-sealed state.

  According to the present invention, there is provided a drain discharge system, a neutralization device, and a hot water heating device that have a simple device configuration, can accurately determine whether or not an abnormal combustion state is present, and have a low risk of failure or the like. 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. Further, the above-described 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 part 5 functions as a part that allows the combustion gas flowing downward in the combustion case 3 to flow in and flows out the combustion gas 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 also referred to as 37a, 37b, and 37c) 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. The ground electrode 36 and the water level electrode 37a are respectively higher by a height H (hereinafter also referred to as the maximum fluctuation width H) than 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. Is located. 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 larger than the position corresponding to at least the lower end of the water level electrode 37a, that is, the upper end of the communicating portion 35. The communication portion 35 is in a position above the fluctuation width H and is in a state where the communication portion 35 is sealed with drain or hot water (hereinafter, this state is also referred to as a water seal state).

  Here, the above-described maximum fluctuation range H is influenced by the combustion gas flowing through the exhaust collecting unit 5 within a range (normal level fluctuation range) in which the combustion unit 2 can normally burn in the hot water supply device 1. Is adjusted to the maximum value of the liquid level drop when the liquid level of the inflow tank 31 is lowered. Specifically, in the hot water supply device 1 of the present embodiment, when the combustion unit 2 performs the combustion operation with the maximum combustion amount, the most combustion gas is generated, and the greatest pressure acts on the liquid level in the inflow tank 31. The maximum fluctuation range H is set in accordance with the liquid level lowering amount when burning with the maximum combustion amount. In addition, when the largest pressure acts on the liquid level in the inflow tank 31 except when the combustion part 2 burns with the maximum combustion amount, the maximum fluctuation range H is set in accordance with the liquid level decrease amount assumed under these conditions. Is set.

  In addition, when the combustion state of the combustion unit 2 is abnormal, a larger pressure acts on the liquid level in the inflow tank 31 than when the combustion operation is performed with the maximum combustion amount, and the liquid level in the inflow tank 31 Will be greatly reduced. Therefore, in the present embodiment, the maximum fluctuation range H is set based on the liquid level lowering amount in the inflow tank 31 when the combustion unit 2 performs a normal combustion operation with the maximum combustion amount. Therefore, when the combustion unit 2 is in a combustion operation and drain or the like cannot be detected by the water level electrode 37a, the combustion state in the combustion unit 2 may be abnormal combustion. Therefore, the detection result by the water level electrode 37a is used as a reference for determining the combustion state in the combustion section 2.

  Further, when the presence of drain or the like cannot be detected by the water level electrode 37a, the water seal state has been eliminated, and the combustion gas may leak through the neutralization device 7. Therefore, the hot water supply device 1 of the present embodiment is configured such that the control device 50 stops the combustion operation of the combustion unit 2 when the presence of drain or the like is not confirmed by the water level electrode 37a. Therefore, the detection result by the water level electrode 37a is also used as a reference for determining whether or not the combustion operation in the combustion unit 2 is possible.

  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 water level electrode 37b is disposed in the inflow tank 31 when the combustion is stopped when a sufficient amount of drainage is stored in the storage container 30 even when the liquid level fluctuates during normal combustion operation. It is attached so that it can be detected whether there is a liquid level at a position where the liquid level is assumed to exist.

  The water level electrode 37c is provided for detecting whether or not the water level has reached a level at which drain or the like in the storage container 30 overflows. 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 drainage or the like may overflow from the top surface 30b instead of from the discharge port 34a due to a drainage abnormality in the storage container 30. The lower end portion is at a position higher than the above-described water level electrodes 37a and 37b (position on the top surface 30b side).

  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 discharge tank 32 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 overflow reference water levels Lx defined by a horizontal plane passing through the lower end of the opening 39 communicating the discharge tank 32 and the discharge portion 34. 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 the discharge tank 32 is provided via an opening 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. Communicating with A discharge port 34 a for discharging drain or the like overflowing from the discharge tank 32 through the opening 39 is provided at the lower portion of the discharge unit 34.

  Here, the storage container 30 described above has an opening 39 that functions as a discharge port for discharging the size (internal volume) of the inflow tank 31 and the discharge tank 32, drain, and the like from the discharge tank 32 to the discharge unit 34. The provided position is adjusted by taking into account fluctuations in the liquid level assumed in the inflow tank 31 and the exhaust tank 32 when the combustion operation is performed in a normal combustion state. More specifically, in the hot water supply device 1 of the present embodiment, the combustion gas generated by performing the combustion operation in the combustion unit 2 flows from the exhaust collecting unit 5 into the inflow tank 31 of the storage container 30. Along with this, pressure acts on the liquid level of the drain or the like in the inflow tank 31, the liquid level on the inflow tank 31 side is lowered, and the liquid level on the discharge tank 32 side is raised.

  Therefore, for example, as shown in FIG. 2A, when water injection is performed until the liquid level reaches the overflow reference water level Lx when the combustion operation is stopped, the liquid level in the inflow tank 31 decreases after the start of combustion. As shown in FIG. 2 (b), drain or the like on the discharge tank 32 side overflows to the discharge portion 34 side through the opening 39 and is discharged. Therefore, if the water injection is performed up to the overflow reference water level Lx when the combustion is stopped, the water injection must be frequently performed to replenish the overflowed drain or the like.

  Therefore, in this embodiment, the volume of the space surrounded by the liquid surface on the discharge tank 32 side and the horizontal plane assumed at the position corresponding to the overflow reference water level Lx in the combustion stopped state is such that the combustion gas or the like is in the inflow tank 31. When the water level is lowered with the inflow, the position (height) of the opening 39 or when the water is injected by the water injection means 40 so that the volume of the drain or the like is pushed from the inflow tank 31 side to the discharge tank 32 side. The water level is adjusted.

  That is, in the present embodiment, the value when the liquid level drop amount in the inflow tank 31 is maximum during the combustion operation (hereinafter also referred to as the maximum liquid level drop amount X1) is experimentally or based on a predetermined mathematical formula or the like. Derived and set. Then, when the liquid level is lowered by the maximum liquid level drop amount X1, the maximum liquid level drop is based on the capacity of drain or the like pushed to the discharge tank 32 side through the communication portion 35 and the cross-sectional area of the discharge tank 32. The amount of liquid level rise on the discharge tank 32 side (hereinafter also referred to as the maximum liquid level rise amount X2) when the liquid level drop on the inflow tank 31 side occurs by the amount X1 is derived. Based on X1 and the like, the amount of drain to be stored in the non-burning state and the position of the opening 39 of the discharge tank 32 are adjusted.

  In the present embodiment, as shown in FIG. 2 (c), in a situation where drain or the like is present up to the water level in the water-sealed state in the storage container 30, only the maximum liquid level rise amount X2 during the combustion operation is on the discharge tank 32 side. As the liquid level rises, an opening 39 serving as a discharge port is provided at a height higher than the position where the liquid level reaches. Moreover, while being able to maintain a water-sealed state, the liquid level by the side of the inflow tank 31 falls only by the maximum liquid level fall amount X1, and after that, even if it stops combustion, only the quantity which does not need to perform rehydration operation in the storage container 30 When drain or the like is present, it is detected whether or not drain or the like is present at a position where the liquid level in the inflow tank 31 is assumed to exist when the combustion is stopped (hereinafter also referred to as a water injection reference water level Lc). A water level electrode 37b is attached at a possible position.

  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 device 1, for example, the flow rate is detected by the control device 50 from a flow rate sensor (not shown) provided in the middle of the water inlet pipe 26 and on the downstream side (heat exchanger side) from the connection position of the water injection pipe 41. When the signal is input, the combustion unit 2 starts the combustion operation. 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.

  Here, in the hot water supply device 1 of the present embodiment, the neutralizing device 7 is put in a water-sealed state to prevent the combustion gas from leaking through the neutralizing device 7, and the storage container 30 of the neutralizing device 7. The combustion state in the combustion unit 2 is grasped based on the transition of the liquid level of the drain stored in the cylinder and it is determined whether or not the combustion operation is possible. Hereinafter, the operation of the neutralizer 7 and the relationship between the water level in the neutralizer 7 and the combustion operation in the combustion unit 2 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. Therefore, in such a state, the combustion unit 2 is in a state where the combustion operation is prohibited.

  In addition, there is a case where only a very small amount of drain or hot water remains in the storage container 30, and the water level of the drain or the like does not reach the horizontal line passing through the lower end portion of the water level electrode 37a (hereinafter also referred to as the judgment reference water level Lj). . In this case, there is a high possibility that the communication portion 35 is not in a water-sealed state as in the case where there is no drain or hot water in the storage container 30 at all. Therefore, also in this case, the combustion unit 2 is in a state where the combustion operation is prohibited.

  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, in this case, before the combustion operation is started in the combustion section 2, the water injection means 40 is operated to perform a replenishment operation for replenishing the storage container 30 with hot water. The replenishment operation is performed until the liquid level of the drain in the storage container 30 reaches the above-described water injection reference water level Lc. That is, the replenishment operation is performed until conduction between the water level electrode 37b and the ground electrode 36 is confirmed. When the replenishment operation is completed, the storage container 30 is in a water-sealed state, and the combustion operation in the combustion unit 2 can be started.

  When hot water is supplied from an external water supply source via the water intake pipe 26 when the storage container 30 is in a water-sealed state, the control means 50 determines that there has been a hot water supply request from the output signal of the flow sensor described above. The combustion operation is started in the combustion section 2. The combustion gas generated by the combustion operation passes through the primary heat exchanger 20 and the secondary heat exchanger 25 arranged in the combustion case 3 and then flows through the exhaust collecting portion 5.

  Here, as described above, when the combustion gas passes through the exhaust collecting portion 5 in accordance with the combustion operation, a part of the inflow tank of the storage container 30 that constitutes the neutralizing device 7 together with the drain through the drain discharge port 27. 31 flows from the top surface 30b side. Along with this, a pressure acts on the liquid surface such as drain in the inflow tank 31. For this reason, during the combustion operation, the liquid level in the inflow tank 31 decreases and the liquid level in the discharge tank 32 increases.

  Further, when the combustion operation in the combustion section 2 is in an abnormal state (abnormal combustion state), the liquid level decrease amount in the inflow tank 31 becomes equal to or greater than the liquid level decrease amount assumed in the normal combustion state. Specifically, when the combustion state in the combustion unit 2 becomes an abnormal combustion state, as shown in FIG. 2D, the determination reference water level Lj () in which the liquid level in the inflow tank 31 is lower than the water injection reference water level Lc. The liquid level for detecting abnormal combustion) falls below the level), and the presence of drain or the like is not detected by the water level electrode 37a. Therefore, the control device 50 stops the combustion operation in the combustion section 2 and prohibits the combustion operation in the combustion section 2 on condition that the presence of drain or the like cannot be confirmed by the water level electrode 37a during the combustion operation. Set the combustion prohibited state.

  As described above, in the neutralization device 7 of the present embodiment, when liquid such as drain is accumulated in the storage container 30 capable of storing drain at the time of combustion stop so that the liquid level becomes equal to or higher than the water injection reference water level Lc. It is possible to prevent the combustion gas that has flowed into the inflow tank 31 from passing through the storage container 30 and discharged to the outside because the portion 35 is in a water-sealed state. 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.

  As described above, in the present embodiment, since the storage container 30 communicates with the combustion gas passage 4, the generation state of the combustion gas such as the wind speed and the air volume of the combustion gas flowing through the combustion gas passage 4 and the silencer 6 are used. Whether or not the combustion state of the combustion section 2 is in an abnormal combustion state using the fact that the liquid level of drain or the like stored in the inflow tank 31 of the storage container 30 is affected by the back wind pressure of I am going to judge. Specifically, whether or not the combustion state of the combustion unit 2 is in an abnormal combustion state is determined based on whether or not the liquid level in the inflow tank 31 is lower than the determination reference water level Lj during the combustion operation. Therefore, in the hot water supply device 1 of the present embodiment, it is possible to detect whether or not the combustion state in the combustion unit 2 is abnormal without separately providing a pressure sensor or the like.

  Moreover, in this embodiment, the structure which judges a combustion state by monitoring the fluctuation | variation of the liquid level position in the storage container 30 using the water level electrode 37a installed in the storage container 30 is employ | adopted. There is no need to provide a sensor or the like for detecting abnormal combustion at a position exposed to a high temperature like a sensor. Therefore, in the hot water supply device 1 of the present embodiment, the configuration for detecting a combustion failure is not exposed to the high-temperature combustion gas, and malfunctions such as failure are unlikely to occur.

  As described above, in the present embodiment, the fluctuation range of the liquid level (normal level fluctuation range) before and after the start of the combustion operation when the combustion state in the combustion unit 2 is normal is equal to or less than the maximum fluctuation range H. In view of this, it is configured to determine whether or not the combustion state of the combustion section 2 is abnormal depending on whether or not there is a fluctuation in the liquid level position exceeding this. However, the present invention is not limited to this. For example, in addition to the above-described normal liquid level fluctuation range, the maximum fluctuation range H is taken into account, for example, by adding other factors such as an error in the liquid level fluctuation range. It is good also as determining whether it is an abnormal combustion state by setting whether this fluctuation range is exceeded.

  Moreover, in the said embodiment, although the combustion state of the combustion part 2 was judged based on the fluctuation range of the liquid level before and behind a combustion action, this invention is not limited to this, Furthermore, a liquid level A configuration may be adopted in which the combustion state is determined in consideration of the rate of change in position, the rate of change, and the like.

  In the above-described embodiment, the combustion operation is started in a state where there is a drain or the like that reaches the liquid injection reference water level Lc or higher in the storage container 30, and the liquid level in the storage container 30 is changed after the combustion operation is started. On the condition that it becomes lower than the determination reference water level Lj, it is determined that there has been a change in the liquid level position that is equal to or greater than the difference between the water injection reference water level Lc and the determination reference water level Lj. That is, in the present embodiment, a configuration is adopted in which fluctuations in the liquid level are detected with reference to two locations, the water injection reference water level Lc and the determination reference water level Lj. However, the present invention is not limited to this. For example, a configuration in which the fluctuation of the liquid level position can be grasped by using a pressure sensor, an optical sensor, etc., and the abnormality of the combustion state is detected by detecting the fluctuation range of the liquid level. It is good also as a structure to detect.

  In the neutralization device 7 described above, a configuration in which a combination of the ground electrode 36 and the water level electrodes 37a to 37c is adopted as a configuration for detecting the water level is shown, but the present invention is not limited to this. . That is, as described above, instead of the water level detection means such as the combination of the ground electrode 36 and the water level electrode 37, a configuration using a pressure sensor, an optical sensor, or the like, or a conventionally known float sensor or ball tap is used. It is good also as a structure.

  Moreover, in the said embodiment, the pressure fluctuation which acts on the liquid level in the storage container 30 is detected based on the fall amount of the liquid level by the side of the inflow tank 31, and it detects whether a combustion state is abnormal. However, the present invention is not limited to this. Specifically, for example, liquid level detection means is provided in the discharge tank 32 to detect the amount of increase in the liquid level on the discharge tank 32 side, and that the combustion state is abnormal on the condition that this is greater than or equal to a predetermined fluctuation range. It is good also as a structure which judges these.

  As described above, in the hot water supply apparatus 1 of the present embodiment, the combustion section 2 is in a combustion prohibited state when it is detected that the combustion operation state of the combustion section 2 is abnormal. Can be prevented from continuing.

  In the above embodiment, the ground electrode 36 and the water level electrodes 37a to 37c are provided on the inflow tank 31 side, and the water injection pipe 41 of the water injection means 40 is connected to the discharge tank 32 side. It is good also as a structure which connected the water injection line 41 of the water injection means 40 to the tank 31 side, and provided the ground electrode 36 and the water level electrodes 37a-37c in the discharge tank 32 side. In addition, when it is set as the structure which connected the water injection pipe line 41 to the top | upper surface 30b side of the storage container 30 as mentioned above, hot water (water supply) falls from the top | upper surface 30b side at the time of the water injection to the storage container 30. Become. At this time, there is a possibility that drain or the like splashes in the storage container 30 or the liquid level undulates, causing the water level electrodes 37a to 37c to erroneously detect the water level. Therefore, in order to prevent such a malfunction, the ground electrode 36 and the water level electrodes 37a to 37c are provided on one side of the inflow tank 31 and the discharge tank 32 as described above, and the water injection conduit of the water injection means 40 is provided on the other side. 41 is preferably connected.

  The neutralization device 7 described above includes two tanks, an inflow tank 31 and an exhaust tank 32, in which drain is stored. However, the present invention is not limited to this, and for example, the inflow tank 31. A separate tank (sub-reservoir) that can store drainage or the like is provided between the tank and the discharge tank 32, or the position upstream of the inflow tank 31 in the drain flow direction or the drain flow with respect to the discharge tank 32. It is good also as a structure which provided another tank (sub storage part) in the position of the direction downstream side. Also, in the case of such a configuration, as described above, when water is poured into the storage container 30, drainage or the like splashes in the storage container 30 or the liquid level undulates, causing the water level to be incorrect. In order to prevent detection, a ground electrode 36 and water level electrodes 37a to 37c are provided in a tank selected from the inflow tank 31, the discharge tank 32, and one or a plurality of sub-reservoir parts, and water is poured into another tank. It is desirable that the water injection pipe 41 of the means 40 be connected.

  In the said embodiment, although the example which comprised the system | strain for discharging | emitting drain outside by the neutralization apparatus 7 which can form a water seal state by storing drain or hot water was illustrated, this is one implementation of this invention. It is only what showed the form, Even if it is the structure which combined the drain discharge system and the neutralization apparatus etc. which formed the drain discharge system provided with the same structure in parts other than the neutralization apparatus 7 Good. 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 water state, (b) is a combustion gas infiltrating into a storage container, and in an inflow tank. The state in which the liquid level has decreased, (c) shows the state in which water injection into the storage container is unnecessary, and (d) shows the state in which the combustion state of the combustion section is abnormal.

1 Hot water supply device (hot water heating device)
2 Combustion section (combustion means)
3 Combustion case 4 Combustion gas passage 5 Exhaust collecting part 6 Silencer part (exhaust part)
7 Neutralizer 20 Primary heat exchanger 25 Secondary heat exchanger 30 Storage container (storage means)
31 Inflow tank (inflow side reservoir)
32 Discharge tank (outflow side storage part)
33 Bulkhead 35 Communication part 36 Ground electrode (Liquid level detection means)
37a to 37c Water level electrode (Liquid level detection means)
40 Water injection means (liquid replenishment means)
41 Water injection line 50 Control device Lj Judgment reference water level Lc Water injection reference water level H Maximum fluctuation range (normal level fluctuation range)

Claims (11)

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 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, a communication section in which the inflow side storage section and the outflow side storage section communicate with each other, and in the storage section Liquid level detecting means capable of detecting the liquid level in
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
Based on the liquid level detected by the liquid level detection means, the liquid replenishment means can replenish liquid to the storage means ,
The combustion state of the combustion means on condition that the difference between the position of the liquid level when the combustion means is in a combustion operation and the position of the liquid level before the combustion means starts the combustion operation exceeds a predetermined range A drain discharge system characterized in that it is possible to determine that is abnormal. When the combustion state of the combustion means is normal, the maximum value of the difference between the position of the liquid level when the combustion means is in the combustion operation and the position of the liquid level before the combustion means starts the combustion operation is maximized. Assuming fluctuation range,
The combustion state of the combustion means on condition that the difference between the position of the liquid level when the combustion means is in the combustion operation and the position of the liquid level before the combustion means starts the combustion operation exceeds the maximum fluctuation range The drain discharge system according to claim 1, wherein the drainage system can be determined to be abnormal.   The maximum fluctuation range is the maximum value of the pressure acting on the liquid level in the storage means due to the influence of the combustion gas generated by the combustion operation of the combustion section, and the maximum wind speed within the range where the combustion operation of the combustion section can be tolerated. 3. The maximum value of the pressure acting on the liquid level in the storage means due to the influence of the back wind flowing into the combustion gas passage when the hot water heater is exposed to the back wind. The drain discharge system described in 1.   When the gas flows from the combustion gas passage side to the storage means side, pressure is applied to the liquid stored in the inflow side storage portion, and the water seal state can be maintained in a state where the liquid level of the inflow side storage portion is lowered. The drain discharge system according to any one of claims 1 to 3, wherein the storage means is replenished with liquid by the liquid replenishment means so as to be equal to or higher than a proper water injection reference liquid level. The liquid level detection means is provided in either the inflow side storage part or the outflow side storage part,
The liquid can be replenished to the storage portion on the side where the liquid level detecting means is not provided by the liquid replenishing means based on the liquid level detected by the liquid level detecting means. 4. The drain discharge system according to any one of 4. The storage means has one or a plurality of sub storage parts communicating with the outflow side storage part,
The liquid level detecting 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 liquid to a storage part different from the storage part provided with the liquid level detection means based on the liquid level detected by the liquid level detection means. The drain discharge system in any one of 1-4.   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. 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 heating apparatus comprising either or both of the drain discharge system according to any one of claims 1 to 6 and the neutralization apparatus according to claim 7. A drain discharge system or neutralizer communicates with the combustion gas passage,
The inflow side storage part and the outflow side storage part of the drain discharge system or the neutralization device communicate with each other via a communication part,
Even if the liquid level in the inflow side reservoir or the outflow side reservoir decreases as much as possible with the combustion operation, the combustion operation can be performed on the condition that the liquid level has reached a level that can maintain the water seal state. Yes,
The hot and cold water heating apparatus according to claim 8, wherein the combustion operation is prohibited under a condition that a liquid level in the storage means falls below a liquid level set for detecting abnormal combustion during the combustion operation. . Liquid level detection means capable of detecting the liquid level is provided in the inflow side reservoir,
When the maximum value of the fluctuation range of the liquid level that fluctuates with the combustion operation when the combustion state is normal is the normal level fluctuation range,
The liquid level detected by the liquid level detection means is such that when gas flows from the combustion gas passage side to the storage means side, pressure acts on the liquid stored in the inflow side storage section, and the liquid in the inflow side storage section. Combustion means is in a combustion-inhibited state on the condition that it is a position that is shifted to the lower side over the normal liquid level fluctuation range with respect to the water injection reference liquid level that can maintain the water-sealed state when the surface is lowered The hot water heater according to claim 8 or 9, characterized in that.   The combustion prohibited state is canceled on the condition that the liquid level in the storage means has reached a reference water injection level after the combustion means enters a combustion prohibited state where the combustion operation cannot be performed. Item 11. A hot water heater according to Item 10.

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