JP2010007929A - Hot water supply device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hot water supply device for miniaturizing a device as a whole while preventing occurrence of problems in constituting a latent heat recovery system by disposing a secondary heat exchanger for recovering latent heat, and a neutralizer for processing drainage. <P>SOLUTION: Latent heat is recovered by supplying an exhaust gas passing through a primary heat exchanger 3 to the secondary heat exchanger 7 in an exhaust collection cylinder 5. The generated drainage is collected in an exhaust sealing section 8a from a lead-in pipe 84, and neutralized in a neutralization tank section 8b while preventing leakage of the exhaust gas by water seal. The exhaust sealing section is preliminarily disposed on a bottom section of an outer shell casing 9 by being assembled in a factory, and a lead-out pipe section 86 is projected to the external, so that the neutralization tank section is connected therewith on site in installing the hot water supply device. The connection is detected by conduction of electricity, and a combustion operation is permitted only when a connection detecting signal is output. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention further recovers the latent heat of the combustion exhaust gas after heating in the secondary heat exchanger when the incoming water (water or low temperature water) is heated by the sensible heat of the combustion heat in the primary heat exchanger to supply hot water. With regard to the latent heat recovery type hot water supply device designed to increase the efficiency of heat utilization by using a hot water supply without inconvenience, particularly when a neutralizer for neutralizing drain water generated during the recovery of latent heat is attached. The present invention relates to a technology capable of realizing a compact apparatus as a whole.

  In general, the latent heat recovery type hot water supply apparatus is also referred to as a so-called condensing type hot water supply apparatus or a highly efficient hot water supply apparatus. In such a latent heat recovery type hot water supply device, when the combustion exhaust gas after passing through the primary heat exchanger for sensible heat recovery is introduced into the secondary heat exchanger for latent heat recovery and the latent heat is recovered, When the combustion exhaust gas comes into contact with the secondary heat exchanger, the water vapor in the combustion exhaust gas is condensed and condensed to generate drain water (condensation water). Since this drain water contains nitrogen oxides (NOx) and sulfur oxides (SOx) taken from combustion exhaust gas and is strongly acidic, it is necessary to at least neutralize it to drain it to the outside. Usually, in order to collect drain water and perform neutralization treatment, a neutralizer is built in and installed in a hot water supply device.

  As such a hot water supply device, conventionally, a secondary heat exchanger is installed in an exhaust collecting cylinder downstream of the primary heat exchanger, and the drain water generated in the secondary heat exchanger is disposed below the exhaust collecting cylinder. One in which water is introduced to a neutralizer installed at a position is known (see, for example, Patent Document 1). Also, the secondary heat exchanger is installed at the upper position of the primary heat exchanger, and the drain water generated by the secondary heat exchanger is introduced to the neutralizer installed at the front position of the primary heat exchanger. The thing is also known (for example, refer patent document 2).

JP 2006-105467 A JP 2000-161788 A

  By the way, in order to configure the hot water supply apparatus to be a latent heat recovery type, it is necessary to newly add a secondary heat exchanger and a neutralizer to a hot water supply apparatus of the other type. For this reason, in the example disclosed in the above-mentioned Patent Document 1, the vertical dimension (height) of the outer casing of the hot water supply device becomes larger by the neutralizer installed at the lower position of the exhaust collecting cylinder, In the example disclosed in Document 2, the front-rear direction dimension (depth dimension) of the outer casing of the hot water supply device becomes larger. For example, the hot water supply apparatus illustrated in FIG. 6 is a configuration example of the one disclosed in the above-mentioned document 1, but in this configuration example, the secondary heat exchanger 101 is installed in the exhaust collecting cylinder 102, and the neutralizing agent is installed. A neutralizer 103 in which a filled neutralization tank portion 103 a and an exhaust seal portion 103 b for preventing leakage of combustion exhaust gas are integrated with each other is installed at a lower position of the exhaust collecting cylinder 101, and these are placed on the gantry 104. It is placed. The lower space 105 of the gantry 104 is used as an installation space for piping systems such as a water inlet pipe 106 and a hot water outlet pipe 107, and electrical equipment. In this case, the outer casing 108 expands in the vertical direction by an amount corresponding to the additional elements of the secondary heat exchanger 102 and the neutralizer 103 as compared with a non-latent heat recovery type hot water supply apparatus. The overall size will be larger.

  Therefore, in order to reduce the size and size of the hot water supply device itself, the drain water treatment system, that is, the neutralizer 103 is installed outside the outer casing 108 to reduce the number of elements installed in the outer casing 108. It is possible to do. However, when such a configuration is adopted, the externally installed neutralizer installs and fixes the outer casing constituting the hot water supply device at the target site, and then connects the neutralizer together with the pipe connection of the water supply piping etc. It will be done in. In other words, the neutralizer is connected by individual connection work at each site, not by a homogeneous assembly in the assembly process at the manufacturing factory. As a result, in the unlikely event that a sealing failure occurs at the connection site due to work variation or the like, it may lead to a situation where combustion exhaust gas leaks out.

  This invention is made | formed in view of such a situation, The place made into the objective is for processing the drain water which generate | occur | produces in the secondary heat exchanger for a latent heat recovery, and a secondary heat exchanger. It is an object of the present invention to provide a hot water supply apparatus that can reduce the overall size of the apparatus while avoiding the possibility of inconvenience when a neutralizer is installed to configure a latent heat recovery type.

  In order to achieve the above object, in the invention according to claim 1, a burner that burns fuel to generate combustion gas, a primary heat exchanger that recovers sensible heat from the combustion gas generated by combustion of the burner, A secondary heat exchanger that recovers latent heat from the flue gas after passing through the primary heat exchanger, a neutralizer that conducts a neutralization treatment by introducing drain water generated in the secondary heat exchanger, and an outer casing; The following specific items were provided for a hot water supply apparatus equipped with That is, as the neutralizer, a neutralization tank section for neutralizing drain water, and a state in which inflow of combustion exhaust gas from the secondary heat exchanger is blocked by a water seal at the inlet side of the neutralization tank section And an exhaust seal portion for introducing drain water. And as the said exhaust seal part, it is previously installed in the said exterior casing, and the drain pipe | tube part of drain water is extended below, and the connection end part was provided in the lower end part. Further, the lead-out pipe is formed by penetrating the outer casing in and out between the neutralizing tank portion and the connection end portion of the exhaust seal portion while being disposed outside the outer casing. A connection end portion that can be connected in communication with the portion.

  In the invention according to claim 2, a burner that burns fuel downward to generate combustion gas, and a primary heat exchanger that is disposed below the burner and recovers sensible heat from the combustion gas generated by the combustion. An exhaust collecting cylinder that collects the flue gas after passing downward through the primary heat exchanger, a secondary heat exchanger that is disposed in the exhaust collecting cylinder and collects latent heat from the flue gas, and An exhaust pipe that extends upward from the exhaust tube and discharges the combustion exhaust gas after passing through the secondary heat exchanger; and a neutralizer that conducts neutralization treatment by introducing drain water generated in the secondary heat exchanger; The following specific items are provided for a hot water supply device including an exterior casing. That is, as the neutralizer, a neutralization tank section for neutralizing drain water, and a state in which inflow of combustion exhaust gas from the secondary heat exchanger is blocked by a water seal at the inlet side of the neutralization tank section And an exhaust seal portion for introducing drain water. And as the said exhaust seal part, it is previously installed in the said exterior casing, and the drain pipe | tube part of drain water is extended below, and the connection end part was provided in the lower end part. Further, the lead-out pipe is formed by penetrating the outer casing in and out between the neutralizing tank portion and the connection end portion of the exhaust seal portion while being disposed outside the outer casing. A connection end portion that can be connected in communication with the portion.

  In the invention according to claim 3, a burner that burns fuel downward to generate combustion gas, and a primary heat exchanger that is disposed below the burner and recovers sensible heat from the combustion gas generated by the combustion. An exhaust collecting cylinder for collecting the combustion exhaust gas after passing downward through the primary heat exchanger, an exhaust pipe communicating with the exhaust collecting cylinder and extending upward from the exhaust collecting cylinder to discharge the combustion exhaust gas, and the exhaust A secondary heat exchanger that is disposed inside the pipe and recovers latent heat from the flue gas supplied into the exhaust pipe, and a neutralizer that conducts neutralization treatment by introducing drain water generated in the secondary heat exchanger The following specific items are provided for a hot water supply device including an outer casing. That is, as the neutralizer, a neutralization tank section for neutralizing drain water, and a state in which inflow of combustion exhaust gas from the secondary heat exchanger is blocked by a water seal at the inlet side of the neutralization tank section And an exhaust seal portion for introducing drain water. And as the said exhaust seal part, it is previously installed in the said exterior casing, and the drain pipe | tube part of drain water is extended below, and the connection end part was provided in the lower end part. Further, the lead-out pipe is formed by penetrating the outer casing in and out between the neutralizing tank portion and the connection end portion of the exhaust seal portion while being disposed outside the outer casing. A connection end portion that can be connected in communication with the portion.

  In the invention according to claim 4, a burner that burns fuel downward to generate combustion gas, and a primary heat exchanger that is disposed below the burner and recovers sensible heat from the combustion gas generated by the combustion. An exhaust collecting cylinder that collects the combustion exhaust gas after passing downward through the primary heat exchanger, an exhaust pipe that communicates with the exhaust collecting cylinder and extends upward from the exhaust collecting cylinder, and an upper end side position of the exhaust pipe. A secondary heat exchanger that is disposed at the upper position of the burner and receives supply of combustion exhaust gas from the exhaust pipe and recovers latent heat; and a neutralization treatment by introducing drain water generated in the secondary heat exchanger The following specific matters were provided for a hot water supply device including a neutralizer to be operated and an outer casing. That is, as the neutralizer, a neutralization tank section for neutralizing drain water, and a state in which inflow of combustion exhaust gas from the secondary heat exchanger is blocked by a water seal at the inlet side of the neutralization tank section And an exhaust seal portion for introducing drain water. And as the said exhaust seal part, it is previously installed in the said exterior casing, and the drain pipe | tube part of drain water is extended below, and the connection end part was provided in the lower end part. Further, the lead-out pipe is formed by penetrating the outer casing in and out between the neutralizing tank portion and the connection end portion of the exhaust seal portion while being disposed outside the outer casing. A connection end portion that can be connected in communication with the portion.

  In the case of each of the above inventions, since the neutralization tank that occupies the main part of the neutralizer can be disposed outside the outer casing, the size of the outer casing, that is, the size of the hot water supply device, compared to the case where it is installed inside Can be reduced. In particular, by installing an exhaust seal part that is more compact than the neutralization tank part in an empty space such as the position of the bottom side of the outer casing, an extra outer casing is required for the entire vertical size of the conventional neutralizer. Compared with the increase in the vertical dimension, the vertical dimension of the outer casing can be greatly reduced. In addition, the neutralization tank part is integrated with the exhaust seal part by connection work at the installation site of the hot water supply device, and the neutralizer is completed. Since the seal portion is installed in advance in the outer casing, there is no possibility that the combustion exhaust gas leaks from the poorly connected portion, and the occurrence of the situation of leakage of the combustion exhaust gas can be reliably avoided. As described above, there is a risk of inconvenience in configuring a latent heat recovery type by installing a secondary heat exchanger for recovering latent heat and a neutralizer for treating drain water generated in the secondary heat exchanger. Therefore, it is possible to provide a hot water supply apparatus that can achieve the compactness of the entire apparatus while avoiding the above.

  In each of the above inventions, the connection detection means for detecting that the connection end of the exhaust seal part and the connection end of the neutralization tank part are connected to each other, and from the connection detection means Control means for monitoring the presence or absence of the output of the connection detection signal and permitting or prohibiting the combustion operation of the burner can be provided. By doing so, in the unlikely event that both the connection end portions are in a poor connection state, there is no connection detection signal from the connection detection means, and the combustion operation can be prohibited, while being securely connected. If so, the combustion operation is permitted by the output of the connection detection signal. Thereby, even if the exhaust seal part and the neutralization tank part are separated from each other, and the neutralization tank part is disposed outside the outer casing and integrated with the neutralizer by on-site connection work, Double fail-safety can be secured.

  As described above, according to the hot water supply device of any one of claims 1 to 5, the neutralization tank portion occupying the main part of the neutralizer can be disposed outside the exterior casing, Compared to the installation, the size of the outer casing, that is, the size of the hot water supply device can be reduced. In particular, the vertical dimension of the outer casing can be greatly reduced as compared with the case where the required vertical dimension of the outer casing has been increased by an extra vertical dimension of the entire conventional neutralizer. In addition, if the neutralization tank is integrated with the exhaust seal part by connecting work at the installation site of the hot water supply device to complete the neutralizer, even if connection failure occurs, the exhaust Since the seal portion is installed in the exterior casing in advance, there is no possibility that the combustion exhaust gas leaks from the poorly connected portion, and the occurrence of the situation of leakage of the combustion exhaust gas can be reliably avoided. As described above, there is a risk of inconvenience in configuring a latent heat recovery type by installing a secondary heat exchanger for recovering latent heat and a neutralizer for treating drain water generated in the secondary heat exchanger. Thus, it is possible to provide a hot water supply apparatus that can reduce the size of the entire apparatus while avoiding the above.

  In particular, according to claim 5, by providing the connection detection means and the control means for performing the monitoring control, if both the connection end portions are in a poor connection state, they are connected. While there is no connection detection signal from the detection means, the combustion operation can be prohibited. On the other hand, if it is securely connected, the combustion operation can be permitted by the output of the connection detection signal. Thereby, even if the exhaust seal part and the neutralization tank part are separated from each other, and the neutralization tank part is disposed outside the outer casing and integrated with the neutralizer by on-site connection work, Double fail-safety can be secured.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<First Embodiment>
FIG. 1 shows a hot water supply apparatus according to a first embodiment of the present invention. This hot water supply apparatus is configured as a latent heat recovery type that achieves high efficiency by recovering latent heat from combustion exhaust gas in the secondary heat exchanger 7 in addition to sensible heat recovery from the combustion gas in the primary heat exchanger 3. ing. In addition, although the structural example called reverse combustion type is shown in the same figure, this invention can be applied even if it is not necessarily reverse combustion type. FIG. 1 shows a single-function type hot water supply device having only a hot water supply function. However, the present invention is not limited to this, and in addition to the hot water supply function, any one of a hot water circulation heating function, a bath replenishment function, and a bath hot water filling function 1 The present invention can be applied to a composite heat source machine having the above functions. Further, the present invention is applied to a hot water supply apparatus configured as a hot water circulation heating apparatus in which low temperature water is introduced, high temperature water after heating is supplied (hot water supply) to a heating terminal, and low temperature water after heat radiation is reentered. The present invention can be applied to a hot water supply apparatus configured as a bath tub that circulates and recirculates, such as taking in bathtub water by a pump and supplying the hot water to the bathtub water (hot water supply). You can also

  The hot water supply apparatus of FIG. 1 includes a can body 4 including a combustion system 2 including a burner 21 and a primary heat exchanger 3, an exhaust collecting cylinder 5 connected in communication with a lower end opening of the can body 4, and an exhaust collecting cylinder 5. An exhaust pipe 6 that is connected to one end side and extends upward, a secondary heat exchanger 7 disposed inside the exhaust collecting cylinder 5, and drain water generated in the secondary heat exchanger 7 It is equipped with a neutralizer 8 that drains after the sum treatment.

  The exhaust collecting cylinder 5 is integrally joined to the can body 4 at a lower position of the can body 4 and is placed and supported on the gantry 91 in this state. A lower space of the gantry 91 is an arrangement space for a piping system, which will be described later, and the controller 10 constituting the control means. And among the exhaust seal part 8a and the neutralization tank part 8b which comprise the neutralizer 8, while the exhaust seal part 8a is installed in the exterior casing 9, the neutralization tank part 8b is outside the exterior casing 9 It is to be installed. Hereinafter, each component will be described in detail.

  The burner 21 of the combustion system 2 is arranged so as to inject a flame downward at the upper part in the can 4. The burner 21 burns vaporized fuel such as gas and liquid fuel such as petroleum (kerosene). In the present embodiment, the burner 21 uses a burner that sprays and burns liquid fuel petroleum (kerosene). Yes. In addition, a silent type vaporizing burner can be used. Then, a fuel supply pipe, a fuel pump, and a blower fan 22 (not shown) are provided as the combustion system 2, and oil supplied by pressure through the fuel supply pipe is sprayed by the operation of the fuel pump to spray combustion air from the blower fan 22. The air-fuel mixture is mixed and jetted downward from the flame hole of the burner 21 to burn.

  The primary heat exchanger 3 is configured, for example, in a fin-and-tube format, and is disposed so as to cross the lower portion in the can 4. An internal space of the can body 4 between the burner 21 and the primary heat exchanger 3 is configured as a combustion chamber, and an inlet pipe for water entering the primary heat exchanger 3 is formed on the outer wall surface of the can body 4 at this portion. 31 is wound in a wound state. The primary heat exchanger 3 receives the combustion gas from the burner 21, mainly heats the incoming water from the inlet pipe 11 by heat exchange heating with the sensible heat, and discharges the heated hot water to the outlet pipe 12. It is like that. At this time, the incoming water from the inlet pipe 11 is first passed through the secondary heat exchanger 7 before entering the primary heat exchanger 3, and the secondary heat exchanger 7 burns the water. After being preheated by recovering latent heat from the exhaust gas, the water is introduced into the primary heat exchanger 3 through the incoming water connection pipe 13 and the inlet pipe 31 and is mainly heated. Then, the hot water heated to the predetermined hot water pipe 12 after being heated to a predetermined temperature passes through an external hot water supply pipe 14 connected to the connection port 121, and is supplied with a predetermined pipe such as a hot water tap in a kitchen or a bathroom or a supply pipe to a bathtub. Hot water is supplied to hot water supply points. Note that tap water or the like is supplied to the water intake pipe 11 from an external pipe 15 such as a water pipe connected to the connection port 111 at a predetermined water supply pressure.

  The exhaust collecting cylinder 5 collects the combustion exhaust gas after passing through the primary heat exchanger 3 downward, and then flows it to the exhaust pipe 6 to make the flow of the combustion exhaust gas U-turn upward. That is, the combustion gas injected downward by the combustion operation of the burner 21 flows from the top to the bottom in the can body 4 constituting the combustion chamber and the flow path of the combustion gas, and passes downward through the primary heat exchanger 3. Then, the exhaust gas after flowing into the collective exhaust pipe 5 is brought into contact with the secondary heat exchanger 7, and the exhaust gas after passing through the secondary heat exchanger 7 passes through the exhaust pipe 6 from the exhaust pipe 61 to the outer casing 9. Will be released to the outside.

  The exhaust pipe 6 has a downstream opening end joined to the upper surface of one side of the exhaust collecting cylinder 5 and extends upward in the side space of the can body 4 and communicates with the outside of the outer casing 9 in an exhaust cylinder 61 which is an upstream end. ing. The outer periphery of the exhaust pipe 6 is covered with a sound absorbing material 62 or the like, and the passage noise of the combustion exhaust gas is insulated and silenced. In other words, it also has a function and role as a silencer. In the case of a silent type such as a vaporizing burner, the sound absorbing material 62 and the like in the exhaust pipe 6 can be omitted.

  As the secondary heat exchanger 7, for example, a multi-tube type is accommodated in the exhaust collecting cylinder 5, brought into contact with the combustion exhaust gas after passing through the primary heat exchanger 3, and recovered from the inlet pipe 11 by recovering its latent heat. Incoming water is preheated. Then, the combustion exhaust gas whose temperature has decreased after the latent heat recovery is discharged to the outside through the exhaust pipe 6.

  As shown in FIG. 2, the neutralizer 8 is connected to an exhaust seal portion 8a and a neutralization tank portion 8b that is configured as a sealed container and filled with a neutralizing agent Z such as calcium carbonate. It is configured in the assembled state. The exhaust seal portion 8a is located below the exhaust collecting cylinder 5 in the exterior casing 9 and at a side position of the gantry 91, and the neutralization tank portion 8b is located below the exhaust seal portion 8a. The casing 9 is installed at an outer position across the constituent wall.

  The exhaust seal portion 8a is provided to prevent leakage of combustion exhaust gas. In short, the exhaust seal portion 8a is formed as a water-sealed seal portion W by forming, for example, a U-shaped channel on the inlet side of the neutralizer 8a that can be filled with drain water, and this water-sealed seal portion. By W, passage of the combustion exhaust gas to the downstream side is prevented. Specifically, the internal space 82 of the main body container 81 is divided into left and right parts by leaving a communication opening 82a having a predetermined size only on the bottom surface side by a partition wall 83 suspended from above. Drain water flows into the first chamber 82b on one side across the partition wall 83 from the introduction pipe 84 connected to the bottom surface of the exhaust collecting cylinder 5, and the second chamber 82c on the other side A lead-out pipe portion 86 extending downward through the overflow opening 85 is communicated. A connection end portion 861 is formed at the lower end portion of the lead-out pipe portion 86, and the connection end portion 861 extends through the bottom wall surface of the outer casing 9 and faces downward. The drain water level in the internal space 82 is always maintained higher than the position of the lower end surface of the partition wall 83. When the water level of the drain water exceeds the overflow surface position of the overflow opening 85, the internal drain water flows over the overflow opening 85 and flows into the neutralization tank portion 8b through the outlet pipe portion 86. Therefore, the water seal part W is constituted by the drain water from the lower end surface position of the partition wall 83 to the overflow surface position of the overflow opening 85.

  Regarding the maintenance of the water seal part W, a water replenishing port 87 is provided on the second chamber 82c, and water is automatically replenished by a water conduit (not shown) connected to the water replenishing port 87. That is, the water guide pipe is extended from the water inlet pipe 11 through a control valve (not shown), and a low water level electrode 88a and a high water level electrode 88b are provided in the internal space 82 as water level detecting means. The control valve is automatically opened and closed by the water replenishment control of the controller 10, and water is replenished so that the water level in the main body container 81 is always maintained within the range of the water seal seal portion W. For example, the exhaust seal portion 8a is emptied before the use of the hot water supply device and before the start of use, or after reuse after draining water to prevent freezing, so the low water level electrode 88a. By detecting that the current water level is below the lower end surface of the partition wall 83 and opening the control valve to replenish water, the high water level electrode 88b closes if the rise of the water level is detected up to the position of the overflow opening 85. It is designed to stop rehydration.

  Further, the neutralization tank 8b is supplied with drain water from a connection end 89 on the upper end side connected to the connection end 861 on the exhaust seal portion 8a side, and the drain water thus introduced flows into the drain port 90 on the lower end side. The neutralization treatment is performed by bringing into contact with the neutralizing agent Z filled inside and causing a neutralization reaction. When the hot water supply apparatus is installed as a wall-mounted type, the neutralization tank portion 8b is provided in the piping space of the external pipes 14 and 15 for hot water supply or water supply formed below the installation fixing position of the outer casing 9. It will be arranged against. The neutralization tank portion 8b may be supported by being fixed to a wall surface or the like on which the exterior casing 9 is installed through an appropriate bracket or the like in addition to the suspension support by connection to the connection end portion 861.

  Then, the connection end 89 on the neutralization tank portion 8b side and the connection end portion 861 on the exhaust seal portion 8a side are connected to each other so that a detection signal indicating that both are connected to the controller 10. An output connection detection means 16 is provided, and monitoring control is executed in the controller 10 based on a detection signal from the connection detection means 16. In this monitoring control, since the connection work of the neutralization tank 8b to the exhaust seal part 8a is an on-site work, the use of the hot water supply device is confirmed after confirming that the neutralization tank 8b is securely connected. (Combustion operation of the burner 21) is permitted, and when it is not connected, the use of the hot water supply device is prohibited (combustion operation is prohibited). The connection detection means 16 illustrated in FIG. 2 is configured to obtain electrical continuity when connected, and a pair of terminals 161 and 161 that interrupt the middle of the line at the connection end 861 on the exhaust seal 8a side. On the other hand, the connection end 89 on the side of the neutralization tank 8b is provided with a pair of terminals 162 and 162 connected in line with each other. When the connection end 89 is connected to the connection end 861, the terminals 162 and 162 on the neutralization tank portion 8 b side are coupled to the terminals 161 and 161 on the exhaust seal portion 8 a side and become conductive and connected to the controller 10. A detection signal is output.

  As shown in FIG. 3, the monitoring control using the connection detecting means 16 is started when the hot water supply device is installed and started to use and turned on, or the operation switch is turned on. It is determined whether or not there is a detection (step S1). If both connection end portions 89 and 861 are connected to each other and a connection detection signal is output (YES in step S1), a signal permitting combustion operation is output to a control unit such as a hot water supply control unit (step S1). Thereafter, the normal hot water supply control provided in the controller 10 is continued. If no connection detection signal is output (NO in step S1), a signal prohibiting the combustion operation is output to a control unit such as a hot water supply control unit (step S3), and the neutralization tank unit 8b is connected. A process of notifying the user that the combustion operation has been forcibly prohibited due to the abnormality is performed (step S4). This notification processing may be performed by displaying text information on the display unit of the remote controller 10a (see FIG. 1) or by voice guidance through a voice output circuit. Of course, you may combine flashing warning lights and sounding warning buzzers.

  In the case of the hot water supply apparatus described above, in the secondary heat exchanger 7, cold water is passed from the inlet pipe 11 as a heating medium, while the combustion exhaust gas flows from the can 4 into the exhaust collecting cylinder 5. While the incoming water is preheated by the latent heat recovery from the water, drain water is generated along with the latent heat recovery. The drain water flows through the bottom surface of the exhaust collecting cylinder 5 and is introduced into the first chamber 82b of the exhaust seal portion 8a through the introduction pipe 84. When the water level exceeds the overflow surface position of the overflow opening 85, it flows along the U-shaped flow path from the first chamber 82b to the second chamber 82c through the communication opening 82a. It flows down to 86 and flows into the neutralization tank part 8b through the connection end parts 861 and 89. The drain water comes into contact with the neutralizing agent Z while flowing through a relatively long path leading to the drain port 90, causing a neutralization reaction to be neutralized.

  And in this embodiment, since the neutralization tank part 8b which occupies the principal part of the neutralizer 8 is installed outside the exterior casing 9, when installing in the exterior casing 108 (refer FIG. 6), In comparison, the size of the outer casing 9 can be reduced. In particular, in the case of this embodiment, the required vertical dimension of the outer casing 9 can be greatly reduced. Further, the neutralization tank portion 8b is integrated with the exhaust seal portion 8a by connection work at the installation site of the hot water supply apparatus to complete the neutralizer 8, but even if a connection failure or the like occurs, Since the exhaust seal portion 8a is installed in the outer casing 9, there is no fear that the combustion exhaust gas leaks from the poorly connected portion, and the occurrence of the situation of leakage of the combustion exhaust gas can be reliably avoided. In addition, when the connection is in a poor state, the combustion operation can be prohibited by monitoring control by the controller 10 using the connection detection means 16, and double fail-safe can be ensured. In addition, since the neutralization tank portion 8b can be arranged by utilizing the empty space of the installation space of the external pipes 14 and 15, it is not necessary to prepare a special installation space outside the outer casing 9.

Second Embodiment
FIG. 4 shows a hot water supply apparatus according to the second embodiment of the present invention. In the second embodiment, the secondary heat exchanger 7a is disposed at the uppermost position of the outer casing 9a on the upper side of the can body 4 so that the combustion exhaust gas is supplied from the downstream end of the exhaust pipe 6. It is a thing. Therefore, the drain water introduction pipe 84 to the exhaust seal portion 8a is also arranged so as to extend from the bottom surface of the heat exchanger case 71 of the secondary heat exchanger 7a. The other components of the second embodiment are the same as those of the first embodiment, including the exhaust seal portion 8a and the neutralization tank portion 8b (FIG. 2) constituting the neutralizer 8, and are the same. Components will be assigned the same reference numerals and detailed description thereof will be omitted.

  The secondary heat exchanger 7a of the second embodiment is configured such that, for example, a multi-tube type is accommodated in a heat exchanger case 71. One end of the heat exchanger case 71 is communicated with the downstream end (upper end opening) of the exhaust pipe 6, and the flue gas supplied from the exhaust pipe 6 is brought into contact with the secondary heat exchanger 7 a, and the water intake pipe is obtained by collecting the latent heat. 11 is preheated, and the flue gas whose temperature has decreased after the recovery of latent heat is discharged to the outside through the exhaust pipe 72.

  In the case of this second embodiment, as the exhaust collecting cylinder 5a, the thickness in the vertical direction can be reduced by the amount not including the secondary heat exchanger 7 as in the first embodiment. Although an installation space for the heat exchanger 7a is required, the neutralization tank portion 8b is installed outside the outer casing 9a as compared with the case of FIG. 6, and therefore the outer casing 9a is more than the outer casing 108 of FIG. The vertical dimension of can be reduced. In addition, other operational effects can be obtained as in the case of the first embodiment.

<Third Embodiment>
FIG. 5 shows a hot water supply apparatus according to a third embodiment of the present invention. In the third embodiment, the secondary heat exchanger 7b is disposed in the exhaust pipe 6a at a side position of the can body 4 so that the combustion exhaust gas is supplied from the exhaust collecting cylinder 5a. Therefore, the drain water introduction pipe 84 to the exhaust seal portion 8a is disposed so as to extend from the bottom surface of the exhaust pipe 6a in which the secondary heat exchanger 7b is disposed, and the exhaust seal portion 8a is also connected to the exhaust pipe 6a. The neutralization tank portion 8b is disposed at a lower position on the left end side of the outer casing 9b as the exhaust seal portion 8a moves. . The other components of the third embodiment are the same as those of the first embodiment, including the exhaust seal portion 8a and the neutralization tank portion 8b (FIG. 2) constituting the neutralizer 8, and are the same. Components will be assigned the same reference numerals and detailed description thereof will be omitted.

  The secondary heat exchanger 7b of the third embodiment is configured such that, for example, a multi-tube type is accommodated in the exhaust pipe 6a. The secondary heat exchanger 7b is provided with an inlet header 73 connected to the downstream end of the inlet pipe 11 on the downstream side (upper side in FIG. 5) of the exhaust pipe 6, and on the upstream side (lower side in FIG. 5) of the exhaust pipe 6b. ) Is provided with an outlet header 74 to which the upstream end of the water inlet connecting pipe 13 is connected. Then, the flue gas flowing in from the exhaust collecting cylinder 5a comes into contact with the secondary heat exchanger 7b and preheats the water from the water intake pipe 11 by recovering its latent heat, and the flue gas whose temperature has decreased after the recovery of latent heat is sent downstream of the exhaust pipe 6a. The gas is discharged to the outside through the exhaust pipe 61 at the end.

  In the case of this third embodiment, as the exhaust collecting cylinder 5a, the thickness in the vertical direction can be reduced by the amount not incorporating the secondary heat exchanger 7 as in the first embodiment, and the outer casing 9b is smaller than in the case of the first embodiment. The vertical dimension of can be reduced. In addition, as other operational effects, the same effects as those of the first embodiment can be obtained.

<Other embodiments>
In addition, this invention is not limited to the said 1st-3rd embodiment, Other various embodiments are included. That is, in each said embodiment, what showed the neutralization tank part 8b directly connected with respect to the exhaust seal part 8a was shown, but it is not restricted to this, For example, extension connection pipes, such as an extension hose, are connected with respect to the exhaust seal part 8a. Alternatively, the neutralization tank 8b may be connected in communication.

  Moreover, in each embodiment, as the neutralization tank part 8b, for example, a synthetic resin molded tank may be used, a hard resin pipe may be used, or a soft resin hose may be used. You may make it form using.

It is explanatory drawing which shows the hot water supply apparatus of 1st Embodiment of this invention. It is expansion explanatory drawing of an exhaust seal part and a neutralization tank part. It is a flowchart which concerns on monitoring control. It is a FIG. 1 corresponding view which shows the hot water supply apparatus of 2nd Embodiment. It is a FIG. 1 corresponding view which shows the hot water supply apparatus of 3rd Embodiment. It is explanatory drawing which shows the conventional hot-water supply apparatus.

Explanation of symbols

3 Primary heat exchangers 5, 5a Exhaust collecting cylinders 6, 6a Exhaust pipes 7, 7a, 7b Secondary heat exchanger 8 Neutralizer 8a Exhaust seal part 8b Neutralization tank parts 9, 9a, 9b Exterior casing 10 Controller (control) means)
16 Connection detection means 21 Burner 86 Lead pipe parts 89 and 861 Connection end part

Claims (5)

Burner that burns fuel to generate combustion gas, primary heat exchanger that recovers sensible heat from combustion gas generated by combustion of this burner, and recovers latent heat from combustion exhaust gas after passing through this primary heat exchanger A hot water supply device comprising a secondary heat exchanger, a neutralizer for neutralizing the drain water generated in the secondary heat exchanger, and an outer casing,
The neutralizer includes a neutralization tank section for neutralizing drain water, and a drain in a state in which inflow of combustion exhaust gas from the secondary heat exchanger is blocked by a water seal at the inlet side of the neutralization tank section. And an exhaust seal portion for introducing water,
The exhaust seal portion is installed in advance in the outer casing, and a drain water discharge pipe portion is extended downward and includes a connection end portion at a lower end portion thereof.
The neutralization tank portion is disposed outside the outer casing, and is connected to the connecting end portion of the exhaust seal portion so as to penetrate the outer casing into and out of the outer casing and to connect to each other. A hot water supply apparatus comprising a connection end portion that can be connected in communication. A burner that burns fuel downward to generate combustion gas, a primary heat exchanger that is disposed below the burner and recovers sensible heat from the combustion gas generated by the combustion, and the primary heat exchanger An exhaust collecting cylinder that collects the flue gas after passing downward, a secondary heat exchanger that is disposed in the exhaust collecting pipe and recovers latent heat from the flue gas, and extends upward from the exhaust collecting cylinder Hot water supply comprising an exhaust pipe for exhausting combustion exhaust gas after passing through the secondary heat exchanger, a neutralizer for neutralizing the drain water generated in the secondary heat exchanger, and an outer casing A device,
The neutralizer includes a neutralization tank section for neutralizing drain water, and a drain in a state in which inflow of combustion exhaust gas from the secondary heat exchanger is blocked by a water seal at the inlet side of the neutralization tank section. And an exhaust seal portion for introducing water,
The exhaust seal portion is installed in advance in the outer casing, and a drain water outlet pipe portion is extended downward and includes a connection end portion at a lower end portion thereof.
The neutralization tank portion is disposed outside the outer casing, and is connected to the connecting end portion of the exhaust seal portion so as to penetrate the outer casing into and out of the outer casing, thereby connecting the lead-out pipe portion to the neutralization tank portion. A hot water supply apparatus comprising a connection end portion that can be connected in communication. A burner that burns fuel downward to generate combustion gas, a primary heat exchanger that is disposed below the burner and recovers sensible heat from the combustion gas generated by the combustion, and the primary heat exchanger An exhaust collecting cylinder that collects the combustion exhaust gas after passing downward, an exhaust pipe that communicates with the exhaust collecting cylinder and extends upward from the exhaust collecting cylinder and discharges the combustion exhaust gas, and is disposed inside the exhaust pipe. A secondary heat exchanger that recovers latent heat from the flue gas supplied into the exhaust pipe, a neutralizer that conducts neutralization treatment by introducing drain water generated in the secondary heat exchanger, and an outer casing are provided. A water heater,
The neutralizer includes a neutralization tank section for neutralizing drain water, and a drain in a state in which inflow of combustion exhaust gas from the secondary heat exchanger is blocked by a water seal at the inlet side of the neutralization tank section. And an exhaust seal portion for introducing water,
The exhaust seal portion is installed in advance in the outer casing, and a drain water discharge pipe portion is extended downward and includes a connection end portion at a lower end portion thereof.
The neutralization tank portion is disposed outside the outer casing, and is connected to the connecting end portion of the exhaust seal portion so as to penetrate the outer casing into and out of the outer casing and to connect to each other. A hot water supply apparatus comprising a connection end portion that can be connected in communication. A burner that burns fuel downward to generate combustion gas, a primary heat exchanger that is disposed below the burner and recovers sensible heat from the combustion gas generated by the combustion, and the primary heat exchanger An exhaust collecting cylinder for collecting the combustion exhaust gas after passing downward; an exhaust pipe communicating with the exhaust collecting cylinder and extending upward from the exhaust collecting cylinder; and an upper end side position of the exhaust pipe at an upper position of the burner. A secondary heat exchanger arranged to receive supply of combustion exhaust gas from the exhaust pipe and recovering latent heat; a neutralizer that conducts neutralization treatment by introducing drain water generated in the secondary heat exchanger; and an outer casing A water heater with
The neutralizer includes a neutralization tank section for neutralizing drain water, and a drain in a state in which inflow of combustion exhaust gas from the secondary heat exchanger is blocked by a water seal at the inlet side of the neutralization tank section. And an exhaust seal portion for introducing water,
The exhaust seal portion is installed in advance in the outer casing, and a drain water discharge pipe portion is extended downward and includes a connection end portion at a lower end portion thereof.
The neutralization tank portion is disposed outside the outer casing, and is connected to the connecting end portion of the exhaust seal portion so as to penetrate the outer casing into and out of the outer casing and to connect to each other. A hot water supply apparatus comprising a connection end portion that can be connected in communication. The hot water supply device according to any one of claims 1 to 4,
A connection detection means for detecting that the connection end of the exhaust seal part and the connection end of the neutralization tank part are connected to each other;
A hot water supply apparatus comprising: control means for monitoring the presence or absence of a connection detection signal output from the connection detection means and permitting or prohibiting the combustion operation of the burner.

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