JP5585774B2 - Hot water unit - Google Patents

Description

  The present invention relates to a hot water unit of a type in which an exhaust top is provided on an outer surface portion of an outer case in which hot water related equipment is housed.

  As the hot water unit, for example, there is a unit that has a device for heating hot water using combustion gas generated by a burner and accommodates the device in an outer case. In such a hot water unit, it is necessary to discharge the combustion gas after being used for hot water heating to the outside of the outer case. For this reason, conventionally, an exhaust top is provided on an outer surface portion such as a front surface portion or a top surface portion of an exterior case, and means for discharging combustion gas from an exhaust port of the exhaust top is employed (for example, Patent Document 1, 2).

However, simply providing the exhaust top on the outer surface of the outer case may cause the following problems.
That is, when a hot water unit is installed in a general home or the like, there are many cases where the location and orientation of the hot water unit are limited, and the hot water unit may be inevitably installed along the wall surface of a house, for example. In this case, for example, even if it is set so that the exhaust port of the hot water unit does not face the wall surface of the house, if the exhaust port is close to the wall surface of the house, the relatively high temperature exhaust gas discharged from the exhaust port This should be avoided because of the possibility of acting on the wall. To keep the exhaust outlet away from the wall surface of the house, the hot water unit should be placed away from the wall surface of the house, but such a state of installation of the hot water unit is not good and the hot water unit and the house Since a large dead space is generated between the wall surface and the wall surface, it is not preferable. Also, depending on the conditions of the installation location, it may be difficult to arrange the hot water unit away from the wall surface of the house.

Therefore, the applicant of the present application has previously proposed the means described in Patent Document 3 as means for solving the above-described problems.
In the means described in the document, when the hot water unit is installed along the wall surface of the house, one end side region near the wall surface of the house is closed using a closing member among the exhaust ports of the hot water unit. . According to such a means, the opening part which is not obstruct | occluded by the obstruction | occlusion member among exhaust outlets becomes a substantial exhaust outlet, the distance between the said opening part and the wall surface of a house is enlarged, and exhaust gas is added to the wall surface of a house. It is possible to make it difficult to act.

  However, when the above-described means is adopted, a phenomenon occurs in which a part of the exhaust gas collides with the closing member inside the exhaust top and proceeds directly from the rear side region of the closing member toward the opening portion of the exhaust port. The traveling direction of the exhaust gas is different from the traveling direction of other exhaust gas that directly passes through the opening portion of the exhaust port from the back of the exhaust top. For this reason, a relatively large disturbance occurs in the flow of the entire exhaust gas discharged from the exhaust port to the outside. If such a disturbance is generated, the exhaust gas easily diffuses in a wide area around the exhaust port, which may cause a situation in which the exhaust gas is blown to an area not intended by the user. In addition, if the exhaust gas contains condensed water (condensed water generated when latent heat is recovered from combustion gas using a heat exchanger), a wide area around the exhaust port is contaminated by condensed water. It is also easy to cause problems. Therefore, it is desired to appropriately eliminate such a problem.

Japanese Patent Laid-Open No. 5-187721 JP 2006-84147 A JP 2009-236468 A

  The present invention has been conceived under the circumstances as described above, and avoids exhaust gas being exhausted at a position close to a desired site such as a wall surface of a house. An object of the present invention is to provide a hot water unit capable of appropriately suppressing the flow state and spreading widely around the exhaust port.

  In order to solve the above problems, the present invention takes the following technical means.

  The hot water unit provided by the present invention is provided with an outer case housing hot water heating means for heating hot water using a heating gas, and provided on the outer surface of the outer case, and the hot water heating means. An exhaust top that forms an exhaust port for exhausting the heating gas used in the above as an exhaust gas to the outside of the outer case, and the exhaust top is attached to the exhaust top so as to close a region near one end in the width direction of the exhaust port A hot water unit, wherein the closing member is attached to the exhaust top, and, of the closing member, an end portion near the center in the width direction of the exhaust port or the vicinity thereof From the back side region of the closing member in the exhaust top to the opening of the exhaust port directly The restricting plate portion for restricting the flow of the exhaust gas so as to suppress Rukoto is characterized in that it comprises further.

According to such a configuration, the lateral width dimension of the exhaust port is substantially shortened by closing the region near the one end in the width direction of the exhaust port with the closing member, and the hot water unit is placed near a predetermined site such as a wall surface of the house. In the case of installation, in addition to being able to discharge exhaust gas at a position away from this predetermined part, the following effects can be obtained.
That is, part of the exhaust gas traveling from the inside of the exhaust top toward the exhaust port collides with the closing member, and directly proceeds from the rear side region of the closing member toward the exhaust port due to the presence of the restriction plate portion. It is suppressed. Exhaust gas that travels directly from the back side region of the closing member toward the exhaust port is a factor that causes a large disturbance in the flow of the entire exhaust gas discharged from the exhaust port to the outside. In the present invention, this factor It is possible to prevent a large disturbance from occurring in the exhaust gas discharged from the exhaust port. As a result, it becomes difficult for the exhaust gas to diffuse to a wide area around the exhaust port, and it is possible to appropriately prevent a situation where the exhaust gas is unreasonably blown to an area not intended by the user or the like. In addition, even when condensed water is contained in the exhaust gas, it is difficult for the condensed water to diffuse to a wide area around the exhaust port, so that the problem of contamination of the periphery of the exhaust port with the condensed water is also appropriately suppressed. Is done.

  In the present invention, it is preferable that the closing member can selectively close either the left end side region or the right end side region in the width direction of the exhaust top so that the left end side and the right end side of the exhaust top can be selectively closed. It is set as the structure which can be attached also to any of these.

  According to such a configuration, when a predetermined part such as a wall surface of a house is disposed close to the left side of the exhaust top, the predetermined part and the exhaust port are closed by closing the left end region of the exhaust port with the closing member. The distance from the opening can be increased. In contrast, in the case where the predetermined portion is arranged close to the right side of the exhaust top, the right end side region of the exhaust port is closed with a closing member, thereby reducing the distance between the predetermined portion and the opening portion of the exhaust port. It can be taken big. As described above, even when the wall surface of the house is arranged on either the left side or the right side of the exhaust top, it is possible to cope with it appropriately.

  In the present invention, preferably, the restriction plate portion includes first and second restriction plate portions that are configured separately from the closing member and are arranged at intervals in a lateral width direction of the exhaust port. And when the closing member is provided so as to close the left end side region, the first restriction prevents the exhaust gas from directly proceeding from the back side region of the closing member toward the opening of the exhaust port. When the closing member is provided so as to close the right end side region, the exhaust gas directly proceeds from the back side region of the closing member toward the opening of the exhaust port. It is set as the structure which can be suppressed by the 2nd control board part.

  According to such a configuration, even if the closing member is attached to either the state where the left end side region of the exhaust port is closed or the state where the right end side region is closed, the exhaust port is discharged from the rear side region of the closing member. It is possible to suppress the exhaust gas from proceeding directly toward the opening using one of the first and second restricting plate portions. Therefore, it becomes more preferable for suppressing the exhaust gas discharged from the exhaust port from being in a turbulent state.

  In the present invention, preferably, the restriction plate portion is configured to be connected to the closing member.

  According to such a configuration, it is not necessary to separately attach the restricting plate portion and the closing member to the exhaust top, and it is possible to reduce the number of parts and simplify the structure for attaching them.

  In the present invention, preferably, the exhaust top is disposed on the top surface portion of the exterior case, is provided to be rotatable in a substantially horizontal direction, and exhaust gas discharged to the outside from the exhaust port faces upward. It has a louver that deflects.

  According to such a configuration, by rotating the exhaust top and changing the direction of the exhaust port, it is possible to easily and appropriately prevent the exhaust gas from hitting a portion where it is not preferable to hit the exhaust gas. In addition, when an exhaust top is provided on the top surface of the exterior case, a part of the exhaust gas discharged from the exhaust port of the exhaust top is blown to the top surface or condensed water contained in the exhaust gas. However, according to the above configuration, the exhaust gas is deflected upward, and as described above, turbulence can be suppressed. For this reason, it is possible to appropriately prevent the above-described problems.

  Other features and advantages of the present invention will become more apparent from the following description of embodiments of the present invention with reference to the accompanying drawings.

It is a schematic explanatory drawing which shows an example of the whole structure of the hot water unit which concerns on this invention. It is a partially-omission perspective view of the hot water unit shown in FIG. It is a principal part perspective view of FIG. It is a principal part perspective view which shows the state before attaching the closure member of FIG. It is a perspective view which shows the whole structure of the auxiliary member which one part has appeared in FIG. 2 and FIG. It is VI-VI sectional drawing of FIG. It is a VII-VII plane sectional view of Drawing 6. FIG. 3 is a partially omitted perspective view showing a state in which the direction of the exhaust top of the hot water unit shown in FIGS. 1 and 2 is changed. It is a partially-omission perspective view of the state which changed the position of the obstruction | occlusion member of the hot water unit shown to FIG. 1 and FIG. FIG. 10 is a plan sectional view of FIG. 9. It is a principal part perspective view which shows the other example of this invention. FIG. 12 is an exploded perspective view of FIG. 11. (A) is XIIIa-XIIIa sectional drawing of FIG. 11, (b) is XIIIb-XIIIb sectional drawing of FIG. It is XIV-XIV sectional drawing of FIG.

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

  1 to 10 show an example of a hot water unit according to the present invention or a configuration related thereto. As shown in FIG. 1, the hot water unit U1 of this embodiment includes a hot water storage tank 10, an expansion tank 11, a heat exchanger 12, a hot water heating device 2 as an auxiliary heat source device, a controller unit 13 having a control board, and these. An exterior case 3 is provided. An exhaust top 4 is provided on the top surface portion 30 of the outer case 3.

  This hot water unit U1 uses, for example, a solar collector (not shown) as a main heat source, and a heating medium circulation circuit (shown) circulates a heating medium between this solar collector and this hot water unit U1. Abbreviation) is provided. The expansion tank 11 is for absorbing the expansion of the heat medium to stabilize the pressure of the heat medium circulation circuit, and the heat exchanger 12 is for heating hot water using the heat medium. is there. Hot water generated by heating using the heat exchanger 12 is stored in the hot water storage tank 10.

  The hot water heating device 2 corresponds to an example of hot water heating means in the present invention, and is for heating hot water when the hot water temperature in the hot water storage tank 10 is less than the target hot water supply temperature. The hot water heater 2 has a configuration similar to, for example, a general gas water heater, and a burner 20 and a primary heat exchanger 21 for sequentially recovering sensible heat and latent heat from the combustion gas generated by the burner 20. And a secondary heat exchanger 22.

  The exhaust top 4 is for performing an exhaust guide of the combustion gas used in the hot water heater 2. The exhaust top 4 has an internal hollow body portion 41 having an exhaust port 40 on one surface, and a cylindrical portion 42 connected to the lower portion of the body portion 41. As shown in FIGS. 3 to 7, the exhaust member 4 is attached to the exhaust top 4, and the auxiliary member 8 having the first and second restricting plate portions 81 and 82 is closed. ing.

  As shown in FIGS. 1 and 6, the cylindrical portion 42 of the exhaust top 4 is relative to the cylindrical exhaust guide 23 provided upright on the secondary heat exchanger 22 in an airtight seal state. It is fitted so that it can rotate. As a result, the combustion gas after heat exchange flows into the exhaust top 4, and this combustion gas is discharged from the exhaust port 40 as exhaust gas. Further, the exhaust top 4 can rotate in a substantially horizontal direction around the cylindrical portion 42. The exhaust port 40 faces substantially in the horizontal direction, and the direction thereof can be changed within an angle range of 360 degrees based on the rotational operation of the exhaust top 4. Therefore, it can be set in a desired direction as shown in FIGS. 2 and 8, for example.

As shown in FIGS. 2 to 4, the closing member 5 is a rectangular flat metal plate, for example, for closing a part of the exhaust port 40. If it demonstrates in detail, the exhaust port 40 will be formed in the horizontally long shape where the width is larger than the length. On the other hand, the closing member 5 has a width that is, for example, less than 1/2 of the width of the exhaust port 40, and selectively closes either the left end side region 40L or the right end side region 40R of the exhaust port 40. It can be attached to the exhaust top 4 as possible. As a means for attaching the closing member 5, a plurality of screw holes 61 provided in the peripheral portion of the exhaust port 40 and a screw body 60 that is screwed into the screw holes 61 are used. There is also one for attaching the closing member 5 to the right end side region 40R as well as the side region 40L. As shown in FIG. 3, the exhaust port 40 is provided with a net-like member 62 for preventing dust and other foreign matter from entering the exhaust top 4.

  The auxiliary member 8 has a form as shown in FIG. 5, and includes a metal main plate portion 80 having an upright plate portion 80 b erected upward from the front end edge of the lower plate portion 80 a, and the upright plate portion 80 b. The first and second restricting plate portions 81 and 82 are provided on the front surface portion of the. A plurality of louvers 85 are formed on the upright plate portion 80b by so-called cutting and raising processing. Each louver 85 is inclined upward and plays a role of upwardly deflecting the exhaust gas discharged from the exhaust port 40 to the outside, as shown in FIG.

  The first and second restricting plate portions 81 and 82 are portions for preventing the exhaust gas discharged from the exhaust port 40 from being disturbed to the outside, and both protrude in the vertical direction while projecting forward from the upright plate portion 80b. It is a standing plate. These first and second restricting plate portions 81 and 82 are made of metal, for example, and are welded or brazed to the upright plate portion 80b. In the present embodiment, the lower ends of the first and second restricting plate portions 81 and 82 are integrally connected via the plate portion 84. According to such a configuration, there is an advantage that the number of parts is reduced as compared with the case where the first and second regulating plate portions 81 and 82 are formed of separate members, and the auxiliary member 8 can be easily manufactured.

  As shown in FIGS. 6 and 7, the auxiliary member 8 is provided on the back side of the net-like member 62 in the exhaust top 4, and the first and second regulating plate portions 81 and 82 are The exhaust ports 40 are arranged at intervals in the width direction. As shown in FIGS. 3 and 7, when the closing member 5 is attached so as to close the left end side region 40 </ b> L of the exhaust port 40, the inside of the exhaust top 4 from the vicinity of one end portion 5 a in the width direction of the closing member 5. The first restricting plate 81 extends toward the back. Unlike this, as shown in FIGS. 9 and 10, when the closing member 5 is attached so as to close the right end side region 40R of the exhaust port 40, the other end portion 5b of the closing member 5 in the width direction. The second restricting plate portion 82 extends from the vicinity of the exhaust gas toward the back of the exhaust top 4.

  Next, the operation of the hot water unit U1 will be described.

  First, when the hot water unit U1 is installed and used in a general household, for example, as shown in FIGS. 2 and 8, the hot water unit U1 is often installed close to the wall surface 70 of the house. On the other hand, since the exhaust top 4 is rotatable in a substantially horizontal direction, for example, as shown in FIG. 8, the exhaust port 40 is set so as not to face the wall surface 70 so that the exhaust gas does not hit the wall surface 70. Is possible. In FIG. 8, the closing member 5 is shown attached to the exhaust top 4, but in the case of FIG. 8, the closing member 5 can be used while being removed from the exhaust top 4.

On the other hand, depending on the conditions of the place where the hot water unit U1 is installed, the setting as shown in FIG. 8 may not be preferable, and the exhaust top 4 must be set in the direction as shown in FIG. 2, for example. There is. However, even in such a case, the exhaust gas exhausting operation from the exhaust port 40 should be avoided at a position that is quite close to the wall surface 70 of the house because the exhaust gas is somewhat hot. It is. In this case, if the left end side region 40L of the exhaust port 40 is closed by the closing member 5, the shortest portion between the opening portion 40 'of the exhaust port 40, that is, the portion that is substantially the exhaust port and the wall surface 70 of the house. The distance L2 can be increased. Unlike the present embodiment, when the closing member 5 is not used, if the shortest distance between the original exhaust port 40 and the wall surface 70 is L1, the relationship of L1 <L2 can be established. This is preferable for avoiding the exhaust gas from acting on the wall surface 70 by placing the substantial hot water unit U1 close to the wall surface 70 of the house and placing the substantial exhaust port 40 ′ far from the wall surface 70. It will be a thing.

  When the left end side region 40L of the exhaust port 40 is closed by the closing member 5, as shown in FIG. 7, a part of the exhaust gas traveling from the inner part of the exhaust top 4 toward the exhaust port 40 is partly closed. Collide with 5 If such exhaust gas advances directly from the back surface side region Be of the closing member 5 to the opening portion 40 ′ of the exhaust port 40 as indicated by the broken line arrow N1, the entire exhaust gas passing through the opening portion 40 ′ will be described. Will be greatly disturbed. However, in the present embodiment, due to the presence of the first restricting plate portion 81, it is appropriately suppressed that the exhaust gas directly proceeds from the back surface region Be toward the opening portion 40 '. As a result, it is avoided that the flow of the exhaust gas passing through the opening portion 40 ′ due to the provision of the closing member 5 is greatly disturbed. As a result, it becomes difficult for the exhaust gas to diffuse to a wide area around the exhaust port 40, and for example, the possibility that the exhaust gas is sprayed on the top surface portion 30 of the exterior case 3 can be reduced. Since the hot water heating device 2 performs latent heat recovery from the combustion gas, the exhaust gas may contain condensed water generated by the latent heat recovery. However, as described above, it is difficult to diffuse the exhaust gas. In this case, the problem that the top surface portion 30 of the outer case 3 is contaminated with condensed water can be reduced. Since the louver 85 provided in the exhaust top 4 advances the exhaust gas upward, the top surface portion 30 is more reliably prevented from being contaminated by the exhaust gas or condensed water in the exhaust gas.

  Unlike the above, it may be necessary to set the exhaust top 4 and the wall surface 70 of the house to the relationship shown in FIGS. 9 and 10. In this case, the position of the closing member 5 may be changed to close the right end side region 40R of the exhaust port 40. With this setting, the shortest distance L3 between the opening 40 ″ of the exhaust port 40, that is, the portion that is substantially the exhaust port, and the wall surface 70 of the house can be increased, and the relationship of L1 <L3 can be established. This makes it difficult for the exhaust gas to act on the wall surface 70 of the house.In this case, as indicated by the arrow N2 in FIG. The direct progression of the exhaust gas is appropriately suppressed by the second restriction plate portion 82. For this reason, it is prevented appropriately that the flow of the exhaust gas discharged from the opening 40 ″ to the outside is greatly disturbed, and the top surface portion 30 of the outer case 3 is also prevented from being contaminated. In order to ensure a sufficient opening area even in a state where a part thereof is closed by the closing member 5, it is formed larger than the originally required size. Even if any of the right end side region 40R is closed, there is no problem that the exhaust resistance becomes abnormally large due to this.

  11 to 14 show another embodiment of the present invention. In these drawings, elements that are the same as or similar to those in the above embodiment are given the same reference numerals as in the above embodiment.

  In the hot water unit U2 shown in FIG. 11, the exhaust top 4A is fixedly attached to the front surface 39 of the outer case 3A. The basic configuration of the hot water equipment housed in the outer case 3A is the same as that of the above embodiment, and the combustion gas generated by the burner (not shown) and finished with heat recovery passes through the exhaust top 4A. It is configured to be discharged to the outside of the outer case 3A.

The exhaust top 4A forms a horizontally long oval or rectangular exhaust port 40, and a closing member 5A is attached to the left end side region 40L of the exhaust top 4A. Of course, instead of this, it is also possible to attach the closing member 5A to the right end side region 40R of the exhaust top 4A. As means for attaching the closing member 5A to the exhaust top 4A, an auxiliary tool 9 shown in FIGS. 12 and 13A is used. This auxiliary tool 9 has the same configuration as the auxiliary tool described in Patent Document 3. The exhaust top 4A is provided with a bar-shaped member 48 extending linearly from one end to the other end, and the auxiliary tool 9 is provided with the bar-shaped member 48.
It is possible to be hooked on the bar-like member 48 so as to sandwich the pin. The closing member 5 </ b> A is fixedly attached to the exhaust top 4 </ b> A by fastening to the auxiliary tool 9 using the screw body 59.

  The restricting plate portion 55 is integrally connected to the closing member 5A. The restriction plate portion 55 has a bent shape so as to protrude from one end of the closing member 5 </ b> A toward the inner portion of the exhaust port 40. However, as shown in FIG. 13 (b), the restriction plate portion 55 is formed with a groove portion 55 a for avoiding interference with the bar-shaped member 48.

  Also in this embodiment, the same effect as that of the above embodiment can be obtained as a basic effect. That is, as shown in FIG. 11, when the distance L1 between the left end of the exhaust port 40 and the wall surface 70 of the house is short, the left end side region 40L of the exhaust port 40 is closed by the closing member 5A. The distance L4 between the opening 40 'and the wall surface 70 of the house can be made long. In this case, as shown by an arrow N3 in FIG. 14, the restriction plate portion 55 can suppress the exhaust gas from directly proceeding from the back surface region Be of the closing member 5A toward the opening portion 40 ′. It is possible to prevent a large disturbance in the flow of the exhaust gas discharged from the mouth 40 to the outside. Although not shown in the drawings, unlike the above, when the wall surface of the house is on the right side of the exhaust port 40, the right end region 40R of the exhaust port 40 is closed by the closing member 5A, which is the same as described above. The effect is obtained. As a result, also in this embodiment, it is possible to prevent the exhaust gas discharged to the outside from the exhaust port 40 or the condensed water contained in the exhaust gas from diffusing into a wide area around the exhaust port 40.

  The present invention is not limited to the contents of the above-described embodiment. The specific configuration of each part of the hot water unit according to the present invention can be varied in design in various ways.

  The exhaust top referred to in the present invention is a member that forms an exhaust port for exhausting the heating gas used in the hot water heating means provided in the exterior case as an exhaust gas to the outside of the exterior case. The shape, material, and size are not limited. As understood from the two embodiments described above, the exhaust top may be provided on the front surface portion or other side surface portion of the exterior case instead of being provided on the top surface portion of the exterior case.

  The closing member only needs to be attachable to the exhaust top so as to close the one end side region in the width direction of the exhaust port, and the specific shape, material, and size are not limited. Moreover, the specific attachment means to an exhaust top is not ask | required. As a means for attaching to the exhaust top, instead of screwing means, for example, a means for locking the closure member to the exhaust top, a suitable closure member so that the closure member can be moved from the left end side region to the right end side region. Various means such as a means for rotatably supporting the shaft portion and a means for slidably providing the closing member in the lateral width direction of the exhaust port can be adopted. Moreover, the specific size of the area | region obstruct | occluded by the obstruction | occlusion member among exhaust ports, or the area ratio which occupies for the whole exhaust port is not limited.

  In short, the restriction plate portion is configured to prevent the exhaust gas from directly traveling from the back side region of the closing member in the exhaust top toward the opening of the exhaust port. What is necessary is just to have the structure extended toward the innermost part in an exhaust top from the one end part near the center of the width direction, or its vicinity. It does not matter whether the closure member is integrated or separated.

The hot water heating means referred to in the present invention performs hot water heating using a heating gas, and the heating gas is not limited to the combustion gas generated using a burner, for example, a fuel cell, a gas engine, etc. It is also possible to use high-temperature exhaust gas discharged from The present invention can be applied to various hot water units in which the hot water heating means is accommodated in the outer case. Therefore, the hot water unit according to the present invention is not limited to that for the solar system, and may be configured as a constituent element of a hot water system using a heat pump, a cogeneration system using a gas engine or a fuel cell, for example. Moreover, it can also comprise as what does not have a hot water storage tank.

U1, U2 Hot water unit 2 Hot water heating device (hot water heating means)
3, 3A Exterior case 4, 4A Exhaust top 5, 5A Closing member 30 Top surface (outer case)
40 Exhaust port 40L Left end side area (exhaust port)
40R Right end side area (exhaust port)
55 Restriction plate portions 81 and 82 First and second restriction plate portions (restriction plate portions)

Claims (5)

An exterior case that contains hot water heating means for heating hot water using a heating gas;
An exhaust top that is provided on the outer surface of the outer case and forms an exhaust port for discharging the heating gas used in the hot water heating means to the outside of the outer case; and
A closing member attached to the exhaust top so as to close a region near one end in the width direction of the exhaust port;
A hot water unit comprising:
In the state in which the closing member is attached to the exhaust top, the exhaust member extends from the end of the exhaust port near the center in the width direction or the vicinity thereof toward the inner portion of the exhaust top, and the exhaust It further comprises a regulating plate portion that regulates the flow of the exhaust gas so as to prevent the exhaust gas from directly proceeding from the rear side region of the closing member in the top toward the opening of the exhaust port. A warm water unit.   The closing member is attached to both the left end side and the right end side of the exhaust top so as to selectively close either the left end side region or the right end side region in the width direction of the exhaust top. The hot water unit according to claim 1, which is configured to be possible. As the restricting plate portion, there are provided first and second restricting plate portions that are configured separately from the closing member and are arranged at intervals in the lateral width direction of the exhaust port,
When the blocking member is provided so as to block the left end side region, the first restriction plate unit prevents the exhaust gas from directly proceeding from the back side region of the blocking member toward the opening of the exhaust port. Is possible,
When the blocking member is provided so as to block the right end side region, the second restriction plate unit prevents the exhaust gas from directly traveling from the back side region of the blocking member toward the opening of the exhaust port. The hot water unit according to claim 2, which is configured to be possible.   The hot water unit according to claim 1 or 2, wherein the restriction plate portion is configured to be connected to the closing member.   The exhaust top is disposed on the top surface portion of the exterior case, is provided to be rotatable in a substantially horizontal direction, and includes a louver that deflects upward the exhaust gas discharged from the exhaust port to the outside. The hot water unit according to any one of claims 1 to 4.

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