JP2010007983A - Hot water supply device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hot water supply device capable of being miniaturized and promoting neutralizing treatment in constituting a latent heat recovering system by disposing a secondary heat exchanger for recovering latent heat, and a neutralizer for treating drainage. <P>SOLUTION: An exhaust pipe 6 for supplying a combustion exhaust gas passing through a primary heat exchanger to the secondary heat exchanger of an upper position, is held by the neutralizer 8. The neutralizer 8 is formed into the U-shape in cross-section by a front face section 84 and both side projecting sections 85, 85. By internally fitting the exhaust pipe 6 into a recessed groove section 86 between the side projecting sections, a clearance space near the exhaust pipe can be effectively utilized as a neutralizer installation space. As the drainage in the neutralizer is heated by receiving the heat conducted from the combustion exhaust gas in the exhaust pipe, a neutralizing reaction can be promoted. <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. Acceleration of neutralization treatment, particularly when installing a neutralizer for neutralizing drain water generated during latent heat recovery And a technology that can realize the downsizing of the entire hot water supply apparatus.

  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. Alternatively, as illustrated in FIG. 6, when the secondary heat exchanger 101 is installed on the upper side and the neutralizer 102 is installed on the side, the lateral dimension (lateral width) of the outer casing 103 of the hot water supply device is more It will be bigger.

  On the other hand, as the neutralization treatment in the neutralizer 102, for example, a neutralizer such as calcium carbonate is usually used, and the neutralization treatment is performed by bringing the neutralizer into contact with drain water. The necessary amount of the neutralizing agent is determined substantially corresponding to the amount of drain water generated. For this reason, since the neutralizer 102 itself needs to have a predetermined size corresponding to the amount of drain water generated, a countermeasure capable of promoting the neutralization treatment is required.

  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. To provide a hot water supply device that can reduce the size of the entire case when installing a neutralizer and configure it as a latent heat recovery type, or a hot water supply device that can also promote neutralization in addition to downsizing. It is in.

  In order to achieve the above object, in the first invention, 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, and the primary An exhaust pipe that extends upward from a downstream position of the heat exchanger and exhausts the combustion exhaust gas after passing through the primary heat exchanger, a secondary heat exchanger that recovers latent heat from the combustion exhaust gas, and the secondary heat The following specific matters were provided for a hot water supply apparatus provided with a neutralizer that neutralizes the drain water generated in the exchanger. That is, the neutralizer is configured to extend in the vertical direction along the exhaust pipe and to be disposed close to the exhaust pipe so as to receive heat transfer from the internal combustion exhaust gas. (Claim 1). Here, the hot water supply device means that the incoming water is heated to a predetermined temperature by recovering latent heat in the secondary heat exchanger or sensible heat recovery in the primary heat exchanger, and the hot water is discharged from the hot water to the hot water supply destination. Heating tap water as incoming water and supplying hot water to a hot water tap (simple hot water supply), heating low temperature water as incoming water and supplying hot water to a hot water heating terminal (hot water supply), for example (Circulation type hot water heating), what supplies low temperature bathtub water (hot water) heated as the incoming water to supply (hot water supply) to the bathtub, or a combination thereof. The definition regarding this hot water supply apparatus is the same as follows.

  In the case of the first aspect of the invention, the neutralizer is disposed so as to extend in the vertical direction along the exhaust pipe extending upward, so that the neutralizer is installed by effectively utilizing the gap space in the vicinity of the exhaust pipe. This makes it possible to reduce the size of the entire hot water supply apparatus when the neutralizer is installed to configure the latent heat recovery type. In addition, since the neutralizer is disposed close to the exhaust pipe so as to receive heat transfer from the combustion exhaust gas in the exhaust pipe, the drain water introduced into the neutralizer is heated by the heat transfer, and this heating is performed. As a result, the speed of the neutralization reaction by the neutralizing agent in the neutralizer increases, and the neutralization treatment is promoted and efficient. As a result, it becomes possible to reduce the amount of neutralizing agent necessary for the neutralization treatment with respect to the same amount of drain water generation amount, which can contribute to the downsizing of the entire hot water supply device by downsizing the overall size of the neutralizer In addition, even if the amount of the neutralizing agent is reduced as compared with the case of not heating, the reliable neutralization performance can be continuously maintained.

  In the second invention, 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, 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 to discharge the combustion exhaust gas; and The following specific matters are provided for a hot water supply device including a secondary heat exchanger that recovers latent heat and a neutralizer that conducts neutralization treatment by introducing drain water generated in the secondary heat exchanger. did. That is, the secondary heat exchanger is interposed in the downstream portion of the exhaust pipe, while the neutralizer extends in the vertical direction along the upstream portion of the exhaust pipe and is internal to the exhaust pipe. In order to receive the heat transfer from the combustion exhaust gas, it is arranged in the vicinity (claim 2).

  In the case of the second invention, a much more compact size can be obtained than in the case of the first invention. That is, a secondary heat exchanger is interposed in the downstream part of the exhaust pipe that extends upward and discharges combustion exhaust gas, that is, the upper half part of the exhaust pipe, and the upstream part of the exhaust pipe, that is, below the exhaust pipe. Since the neutralizer is installed in the half-side part, there is no need to increase the vertical dimension in order to install the secondary heat exchanger, and the gap space in the vicinity of the remaining exhaust pipe in the lower half part is effective. It is possible to install a neutralizer by using it. As described above, when the secondary heat exchanger and the neutralizer are installed to configure the latent heat recovery type, the entire hot water supply apparatus can be effectively made compact. In addition, the neutralization treatment is promoted by heat transfer from the combustion exhaust gas in the exhaust pipe as in the case of the first invention. That is, since the neutralizer is disposed close to the exhaust pipe so as to receive heat transfer from the combustion exhaust gas in the exhaust pipe, the drain water introduced into the neutralizer is heated by the heat transfer, This heating increases the speed of the neutralization reaction with the neutralizing agent in the neutralizer, thereby promoting the neutralization treatment and increasing the efficiency. As a result, it becomes possible to reduce the amount of neutralizing agent necessary for the neutralization treatment with respect to the same amount of drain water generation amount, which can contribute to the downsizing of the entire hot water supply apparatus by downsizing the overall size of the neutralizer. In addition, even if the amount of the neutralizing agent is reduced as compared with the case of not heating, the reliable neutralization performance can be continuously maintained.

  In the first or second invention described above, an outer casing including a main body case having a front surface opened and a front cover for closing the front surface of the main body case so as to be openable and closable is provided. In a state where the concave groove portion opened to the side has a U-shaped cross section so as to extend in the vertical direction, and the front cover is opened with respect to the exhaust pipe installed in the body case, By inserting the one side opening toward the exhaust pipe, the exhaust pipe can be accommodated in the concave groove portion and disposed in a state of being sandwiched from both the left and right sides (Claim 3). In this way, by adopting a structure that can accommodate the exhaust pipe in the concave groove and sandwich it from both the left and right sides as a neutralizer, it is possible to efficiently receive heat transfer from the combustion exhaust gas in the exhaust pipe On the other hand, it is possible to further increase the degree of effective utilization of the gap space in the vicinity of the exhaust pipe and further promote the downsizing of the hot water supply apparatus. Furthermore, since the neutralizer is inserted into the exhaust pipe with the front cover open, it is necessary to remove the neutralizer in the course of use of the hot water supply device, or the neutralizer inside the neutralizer Even if maintenance is required, such as when it is necessary to replace it, the front cover can be removed and the neutralizer can be pulled out and inserted from the front side. It can be done easily.

  As described above, according to the hot water supply apparatus of claim 1 or claim 3, the neutralizer can be installed by effectively utilizing the gap space in the vicinity of the exhaust pipe, and the neutralizer is installed. In configuring the latent heat recovery type, the entire hot water supply apparatus can be made compact. In addition, the drain water introduced into the neutralizer can be heated by heat transfer from the combustion exhaust gas in the exhaust pipe, and by heating, the speed of the neutralization reaction by the neutralizing agent in the neutralizer is increased, The neutralization treatment can be promoted and efficient. As a result, by reducing the amount of the neutralizing agent, it is possible to reduce the size of the entire neutralizer, thereby contributing to the overall compactness of the hot water supply device and reducing the amount of the neutralizer. Even if it is the amount of a summing agent, reliable neutralization performance can be continuously maintained.

  According to the hot water supply device of claim 2 or 3, the secondary heat exchanger is interposed in the downstream portion of the exhaust pipe extending upward, and the neutralizer is installed in the upstream portion of the exhaust pipe. Therefore, it is possible to install a neutralizer without effectively increasing the vertical dimension to install a secondary heat exchanger and effectively utilizing the gap space near the exhaust pipe of the remaining part. In addition, when the secondary heat exchanger and the neutralizer are installed to configure the latent heat recovery type, the entire hot water supply apparatus can be greatly downsized. In addition, the drain water introduced into the neutralizer can be heated by heat transfer from the combustion exhaust gas in the exhaust pipe, and the rate of neutralization reaction by the neutralizing agent in the neutralizer can be increased by heating. It will be possible to increase the neutralization treatment efficiency and efficiency. As a result, by reducing the amount of the neutralizing agent, it is possible to reduce the size of the entire neutralizer, thereby contributing to the overall compactness of the hot water supply device and reducing the amount of the neutralizer. Even if it is the amount of a summing agent, reliable neutralization performance can be continuously maintained.

  In particular, according to the third aspect, the heat transfer from the combustion exhaust gas in the exhaust pipe can be efficiently received, and the degree of effective utilization of the gap space existing in the vicinity of the exhaust pipe is further increased to make the hot water supply compact. Can be further promoted. Further, the neutralizer can be easily attached and detached from the front side with the front cover opened, and maintenance work such as removal or replacement of the neutralizer can be easily performed. In addition, by adopting such a structure, the neutralizer covers the periphery of the exhaust pipe, and noise generated from the exhaust pipe can be prevented.

  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, as long as it is equipped with the exhaust pipe 6 extended upwards and supplying a combustion exhaust gas to the secondary heat exchanger 7 as mentioned later, it is not necessarily required. The present invention can be applied even if it is not a 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 in which an upper end opening of the exhaust pipe 6 is connected to a heat exchanger case 71, and a secondary heat exchanger 7 are generated. The neutralizer 8 that drains the drain water after neutralizing it and a piping system that will be described later are installed in a main body case 91 that constitutes a part of the outer casing 9.

  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 92 in this state. The lower space of the gantry 92 is an arrangement space for a piping system and a controller (not shown), which will be described later. The exhaust pipe 6 whose downstream opening end is joined to the upper surface of one side of the exhaust collecting cylinder 5 extends upward in the side space of the can body 4, and is a secondary heat exchanger installed in the upper space of the can body 4. Combustion exhaust gas is supplied to 7. A neutralizer 8 is detachably attached to the exhaust pipe 6 as will be described later. 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 gaseous fuel such as gas and liquid fuel such as petroleum (kerosene). In this embodiment, a spray-type burner that sprays and burns liquid fuel petroleum (kerosene) is used. be able to. As another example, a vaporizing burner can be used as a type that can achieve quietness. A fuel supply pipe, a fuel pump, and a blower fan 22 (not shown) are provided as the combustion system 2, and the oil supplied by pressure through the fuel supply pipe is vaporized by the operation of the fuel pump, and 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 a predetermined temperature and discharged to the hot water discharge pipe 12 passes through a hot water supply pipe (not shown) connected to the connection port 121, and a predetermined hot water supply such as a hot water tap in a kitchen or a bathroom or a supply pipe to a bathtub. Hot water is supplied to the location. Note that tap water or the like is supplied to the water intake pipe 11 from a water pipe or the like (not shown) 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 flue gas is collected in the collective exhaust tube 5, and then the flue gas flows into the exhaust pipe 6 and flows upward from the bottom to be supplied to the secondary heat exchanger 7.

  The exhaust pipe 6 has an upstream end (lower end opening) 61 communicated with the upper surface of one side of the exhaust collecting cylinder 5, and a downstream end (upper end opening) 62 communicated with the lower surface of the heat exchanger case 71 of the secondary heat exchanger 7. They are connected and arranged so as to extend in the vertical direction. The exhaust pipe 6 has a long length in the front-rear direction (depth direction) of the outer casing 9 as illustrated in FIG. 2 in order to ensure a large cross-sectional area of the flow path as much as possible in consideration of space efficiency in the outer casing 9. It is formed to have a circular cross-sectional shape. For the same purpose, it is also possible to select a rectangular or elliptical cross-sectional shape. And the neutralizer 8 is arrange | positioned so that the outer wall surface of the exhaust pipe 6 may be pinched | interposed through the heat insulation packing 63 in between. The exhaust pipe 6 through which such combustion exhaust gas passes is preferably formed of a metal having high corrosion resistance such as stainless steel.

  The secondary heat exchanger 7 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 communicates with the exhaust pipe 6, and the combustion exhaust gas supplied from the exhaust pipe 6 is brought into contact with the secondary heat exchanger 7 to preheat the incoming water from the inlet pipe 11 by recovering the latent heat. The flue gas whose temperature has decreased after the latent heat recovery is discharged to the outside through the exhaust pipe 72.

  As shown in FIG. 2 or FIG. 3, the neutralizer 8 has a main body container 81 configured as a sealed container filled with a neutralizing agent Z such as calcium carbonate, and has an inlet 82 on the upper end side (FIG. 3). While the drain water introduced from (refer to FIG. 4) flows to the outlet 83 on the lower end side, the neutralization treatment is performed by bringing into contact with the neutralizing agent Z and causing a neutralization reaction. The inlet 82 is opened at the bottom of the heat exchanger case 71 of the secondary heat exchanger 7 (see FIG. 1) so that drain water can be collected and introduced. The outlet 83 is connected to the drain pipe 14 and is drained to the outside through a pipe (not shown) connected to the connection port 141.

  The main body container 81 is formed by synthetic resin molding so that the laterally projecting portions 85 and 85 are integrally projected toward the rear side from the left and right positions of the front surface portion 84 so that the cross-sectional shape becomes a U-shape. A concave groove 86 is formed by being surrounded by the front surface portion 84 and the laterally extending portions 85, 85 on both sides. The recessed groove portion 86 opens to the rear side and penetrates in the vertical direction, and the inner surface shape of the recessed groove portion 86 is such that the exhaust pipe 6 can be fitted inside the recessed groove portion 86 with the heat insulating packing 63 interposed therebetween. Is formed. Such assembling of the neutralizer 8 is performed as follows. That is, with the front cover 93 (see FIG. 3) constituting a part of the outer casing 9 removed from the main body case 91 and the front surface opened, the opening of the concave groove 86 is opposed to the exhaust pipe 6 and The exhaust pipe 6 is accommodated in the recessed groove portion 86 by inserting the sump 8 from the front to the rear, and the exhaust pipe 6 is sandwiched between the front surface portion 84 and the side projecting portions 85 and 85 on both sides. In this state, for example, it is fixed by the mounting piece 87 or the like. In order to remove the neutralizer 8 from the exhaust pipe 6, the main body container 81 may be pulled out in the opposite direction.

  The heat insulating packing 63 is necessary for promoting the neutralization reaction while suppressing the heat transfer from the exhaust pipe 6 to the neutralizer 8 side to be equal to or lower than the heat resistant temperature based on the forming material of the main body container 81. It is provided so as to allow heat transfer to the extent that heating is performed. That is, the main body container 81 is formed of a synthetic resin such as polypropylene in the present embodiment, and the combustion that passes through the exhaust pipe 6 in consideration of the heat resistance and durability of the main body container 81 due to this material. Heat transfer from exhaust gas (for example, 160 ° C.) is suppressed to, for example, about 100 ° C. or less. Therefore, the heat insulating packing 63 can be omitted depending on the material for forming the main body container 81 of the neutralizer 8 (for example, a metal such as stainless steel), and the exhaust pipe 6 and the neutralizer 8 are brought into contact with each other. Or may be arranged close to each other through a minute gap.

  In the case of the present embodiment described above, in the secondary heat exchanger 7, cold water is passed from the inlet pipe 11 as a heating medium, while combustion exhaust gas is caused to flow from the exhaust pipe 6 into the heat exchanger case 71. While the incoming water is preheated by the recovery of latent heat from the combustion exhaust gas, drain water is generated along with the recovery of the latent heat. The drain water flows through the bottom surface of the heat exchanger case 71, collects water at the inlet 82 of the neutralizer 82, and is introduced into the main body container 81 of the neutralizer 8 from the inlet 82. Then, while flowing through a relatively long path from the inlet 82 to the outlet 83, the drain water comes into contact with the neutralizing agent Z and causes neutralization to be neutralized. At this time, since the heat transfer from the combustion exhaust gas in the exhaust pipe 6 is received through the heat insulating packing 63, the drain water in the main body container 81 can be heated, and the rate of the neutralization reaction is accompanied by this heating. As a result, the neutralization treatment can be promoted. Since the neutralization treatment can be promoted, the amount of neutralizing agent required in the neutralizer 8 can be further reduced, and the required internal volume of the main body container 81 can be made smaller and more compact. become. Of course, even if the neutralizer 8 has a reduced amount of neutralizer, it is possible to reliably maintain the neutralization treatment.

  In this embodiment, the neutralizer 8 has a U-shaped cross-sectional shape and can be disposed along the exhaust pipe 6 so that the gap space near the exhaust pipe 6 can be used effectively. Therefore, even if the neutralizer 8 is installed, it is possible to hardly increase the size of the outer casing 9, and the size can be greatly reduced as compared with the case where it is disposed on the side of the can body in FIG. Will be able to. This compactness can further increase the degree of heat transfer from the combustion exhaust gas in the exhaust pipe 6 to promote neutralization. In addition, since the periphery of the exhaust pipe 6 is covered with the neutralizer 8 clogged with the neutralizing agent Z, the neutralizer 8 effectively prevents the passage noise when the combustion exhaust gas passes through the exhaust pipe 6. Sound can be insulated. For this reason, it is not necessary to cover the outer periphery with the sound absorbing material 105 or the punching metal 106 for the sound insulation / muffling of the passage noise of the combustion exhaust gas as in the exhaust pipe 104 in the conventional hot water supply apparatus (see FIG. 6). It is possible to omit the sound absorbing materials 105, 106 and the like which are necessary for the sound insulation / muffling. That is, the neutralizer 8 can function and serve as a silencer. As a result, the outer size of the exhaust pipe 6 can be further reduced, and the portion can be effectively utilized as a space for installing the neutralizer 8, and the above-described compactification can be further advanced. become able to.

  In addition, when maintenance such as inspection or replacement of the neutralizer 8 is necessary, if the front cover 93 is opened, the neutralizer 8 can be pulled out or inserted from the exhaust pipe 6 from the front side and attached or detached. Therefore, the above maintenance can be easily performed.

Second Embodiment
FIG. 4 shows a hot water supply apparatus according to the second embodiment. In the hot water supply apparatus of the second embodiment, the lower half part (upstream part) of the exhaust pipe 6 of the first embodiment is used as the exhaust pipe 16 of the second embodiment, and a neutralizer 18 is disposed around the exhaust pipe 16. The secondary heat exchanger 17 is installed in place of the upper half part (downstream part) of the exhaust pipe 6 (see FIG. 1) of the first embodiment, and is further compacted than the first embodiment. It is possible to obtain the operational effects as described above. In addition, since the other component of 2nd Embodiment is the structure similar to the thing of 1st Embodiment, the same code | symbol is attached | subjected to the same component and the detailed description is abbreviate | omitted.

  The exhaust pipe 16 and the neutralizer 18 and the secondary heat exchanger 17 of the second embodiment are arranged so as to extend in the vertical direction at the side position of the can body 4. The structure of the exhaust pipe 16 and the neutralizer 18 is the same as that of the first embodiment except that the vertical dimension of the exhaust pipe 6 and the neutralizer 8 of the first embodiment is shortened.

  That is, the exhaust pipe 16 has the same cross-sectional shape as the exhaust pipe 6 of the first embodiment, the upstream end (lower end opening) 61a is connected to the upper surface of one side of the exhaust collecting cylinder 5, and the downstream end (upper end opening) 62a. Are connected in communication with the lower surface of the heat exchanger case 71a of the secondary heat exchanger 17, and are arranged so as to extend in the vertical direction therebetween.

  As shown in FIG. 5, the neutralizer 18 is a container in which a main body container 81a configured as a sealed container is filled with a neutralizing agent such as calcium carbonate, and drain water introduced from an inlet 82a on the upper end side. Is neutralized by contacting the neutralizing agent and causing a neutralization reaction while flowing to the outlet 83 on the lower end side. The inlet 82a is opened at the bottom of the heat exchanger case 71a of the secondary heat exchanger 17 so that drain water can be collected and introduced. The outlet 83a is connected to the drain pipe 14, and drained to the outside through a pipe (not shown) connected to the connection port 141.

  The main body container 81a is formed by synthetic resin molding so that the laterally projecting portions 85a and 85a integrally project toward the rear side from both the left and right positions of the front surface portion 84a so that the cross-sectional shape becomes a U-shape. A concave groove 86a is formed by being surrounded by the front surface portion 84a and the laterally protruding portions 85a and 85a on both sides. The recessed groove portion 86a opens to the rear side and penetrates in the vertical direction, and the inner surface of the recessed groove portion 86a has an insulating packing 63 (see FIG. 2) similar to that of the first embodiment interposed therebetween. Is formed so as to be able to be fitted inside the concave groove 86a. As with the first embodiment, the neutralizer 18 is assembled in the exhaust pipe 16 with the front cover 93 constituting a part of the outer casing 9a removed from the main body case 91 and the front surface opened. The exhaust pipe 16 is accommodated in the concave groove portion 86a by inserting the neutralizer 18 from the front to the rear with the openings of the concave groove portion 86a facing each other, and the exhaust pipe 16 is connected to the front surface portion 84a and the side projecting portions on both sides. The state is sandwiched between 85a and 85a. In this state, it is fixed by, for example, the mounting piece 87a. In order to remove the neutralizer 18 from the exhaust pipe 16, the main body container 81a may be pulled out in the reverse direction.

  In addition, the secondary heat exchanger 17 is configured, for example, as a multi-tube type housed in a heat exchanger case 71a. The heat exchanger case 71a communicates with the downstream end (upper end opening) 62a of the exhaust pipe 16 at its lower end surface, and the exhaust cylinder 72 extends from the upper end surface to communicate with the outside. Combustion exhaust gas supplied from the exhaust pipe 16 is brought into contact with the secondary heat exchanger 7 to recover the latent heat, and preheated water from the water intake pipe 11a. To be released. The drain water generated in the heat exchanger case 71a due to the latent heat recovery is collected at the inlet 82a of the neutralizer 18 along the inclined surface of the bottom surface and led out to the neutralizer 18.

  The water to be heated in the case of the second embodiment is passed through the water inlet pipe 11a to the secondary heat exchanger 17, and the water after being preheated by the secondary heat exchanger 17 is led to the water inlet connecting pipe 13a. This water is supplied to the primary heat exchanger 3 through the introduction pipe 31. The primary heat exchanger 3 is heated to the set temperature, and then hot water is supplied through the hot water discharge pipe 12 and a hot water supply pipe (not shown).

  In the case of the second embodiment described above, it is possible to obtain the same operational effects as those obtained by the first embodiment, and in addition to the secondary heat exchanger 7 installed in the upper space in the first embodiment. Instead, since the secondary heat exchanger 17 is disposed in the side space of the can body 4, the size of the hot water supply device (that is, the outer casing 9a) is further reduced and made compacter than the first embodiment. Will be able to.

<Other embodiments>
The present invention is not limited to the first and second embodiments described above, but includes other various embodiments. That is, in the first and second embodiments, the main body containers 81 and 81a of the neutralizers 8 and 18 have a U-shaped cross-sectional shape, but the present invention is not limited to this. It can be inserted into a gap extending vertically between the pipes 6 and 16 and the can body 4 or a gap extending vertically between the exhaust pipes 6 and 16 and the outer casings 9 and 9a (main body case 91). The main body container may be constituted by a thin flat plate-shaped airtight container having a thickness, and the main body container may be inserted from the front side with the front cover 93 opened to be detachably disposed. At this time, heat transfer from the internal combustion exhaust gas is received as a proximity arrangement with respect to the exhaust pipes 6 and 16.

It is explanatory drawing which shows the hot water supply apparatus of 1st Embodiment of this invention. It is an expanded sectional explanatory view in the AA line of FIG. It is explanatory drawing which shows a neutralizer and an exhaust pipe with a disassembled perspective view. It is explanatory drawing which shows the hot water supply apparatus of 2nd Embodiment. It is explanatory drawing which shows the secondary heat exchanger of FIG. 4, an exhaust pipe, and a neutralizer with a disassembled perspective view. It is explanatory drawing which shows the example of the hot water supply apparatus for demonstrating the conventional problem.

Explanation of symbols

3 Primary heat exchanger 5 Exhaust collecting cylinders 6, 16 Exhaust pipes 7, 17 Secondary heat exchangers 8, 18 Neutralizer 9 Exterior casing 21 Burner 86 Concave groove 91 Main body case 93 Front cover

Claims (3)

A burner for combusting fuel to generate combustion gas; a primary heat exchanger for recovering sensible heat from the combustion gas generated by combustion of the burner; and the primary heat exchanger extending upward from a downstream position of the primary heat exchanger. An exhaust pipe for discharging the combustion exhaust gas after passing through the heat exchanger, a secondary heat exchanger for recovering latent heat from the combustion exhaust gas, and neutralizing treatment by introducing drain water generated in the secondary heat exchanger A water heater equipped with a neutralizer,
The neutralizer extends in the vertical direction along the exhaust pipe, and is disposed close to the exhaust pipe so as to receive heat transfer from the internal combustion exhaust gas. Hot water supply device. 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 to discharge the combustion exhaust gas, and a secondary that recovers latent heat from the combustion exhaust gas A hot water supply device comprising a heat exchanger and a neutralizer for neutralizing the drain water generated in the secondary heat exchanger,
The secondary heat exchanger is interposed in the downstream portion of the exhaust pipe, while the neutralizer extends in the vertical direction along the upstream portion of the exhaust pipe, and is internal to the exhaust pipe. A hot water supply apparatus, wherein the hot water supply apparatus is disposed in close proximity to receive heat transfer from combustion exhaust gas. The hot water supply device according to claim 1 or 2,
It has an exterior casing composed of a main body case with the front surface opened and a front cover that closes the front surface of the main body case so that it can be opened and closed.
The neutralizer has a U-shaped cross-sectional shape so that a concave groove opening on one side extends in the vertical direction, and the front cover is attached to the exhaust pipe installed in the main body case. In the open state, the one side opening is inserted toward the exhaust pipe so that the exhaust pipe can be accommodated in the concave groove and disposed between the left and right sides. apparatus.

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