JP2013231559A - Combustion device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a combustion device capable of appropriately preventing or controlling the heating of a partition member that partitions two flame initiation regions of burners and a heat shield panel to a high temperature by a simple means.SOLUTION: A heat shield panel 8 provided in a combustion device C1 has a second air outlet 84b positioned higher than each of first and second burners 5A and 5B which a lower standing panel 83 faces and approaches and a lower horizontal panel 82, the outlet functioning as an air outlet for making a part of air which has flowed into an air flow channel 27 formed between the heat shield panel 8 and the partition member 29 out to the facing region of the heat shield panel 8 from a position lower than a first air outlet 84a at an upper end.

Description

  The present invention relates to a combustion apparatus configured as a hot water supply apparatus and the like, and more particularly, to a combustion apparatus having a configuration in which a plurality of burners are accommodated in one burner case and partitioned between them using a partition member.

  When two burners are accommodated in one burner case and the two burners are partitioned by a partition member, the partition member may be heated to a considerably high temperature to cause thermal damage. Therefore, conventionally, as a means for protecting the partition member, the partition member is covered with a heat shield plate, and an air flow path is formed between the partition member and the heat shield plate. There is means for circulating a part of the combustion air supplied from the fan to the burner case. As an example of such means, there is a means described in Patent Document 1, which is shown in FIG.

In the means shown in FIG. 9, heat shield plates 92 are provided on both sides of the partition member 91 provided between the first and second burners 9A and 9B. An air passage 93 having an air outlet 93 a at the upper end is formed between the heat shield plate 92 and the partition member 91, and cooling air flows through the air passage 93. Further, a lower horizontal plate portion 92a and a lower standing plate portion 92b are provided in a lower region of the heat shield plate 92, and an air outlet 93b is provided in the lower horizontal plate portion 92a.
According to such a configuration, the heat shield plate 92 and the partition member 91 are cooled by the air flowing through the air flow path 93. In addition, due to the action of air flowing out from the air outlet 93b, the flame and combustion gas of the first and second burners 9A and 9B are also prevented from contacting or approaching the heat shield plate 92.

  However, the prior art still has room for improvement as described below.

That is, the lower horizontal plate portion 92a is set to be substantially the same height as the first and second burners 9A and 9B so as to avoid contact with the flame, and the air outlet 93b is also the same height. Therefore, the height of the air outlet 93b is low, and the air flowing upward from the air outlet 93b does not reach the same height as the upper ends of the heat shield plate 92 and the partition member 91 in the airflow state. Easy to diffuse. As a result, the flames of the first and second burners 9A and 9B and the high-temperature combustion gas approach the upper region of the heat shield 92 and the partition member 91, and this region may be heated to a high temperature to cause thermal damage. is there.
When the combustion device is configured as a hot water supply device provided with a heat exchanger and the heat exchanger is arranged on the upper side of the first and second burners 9A and 9B, the heat exchanger is caused by secular change or the like. , Exhaust obstruction may occur. When such a phenomenon occurs, the high-temperature combustion gas generated by the first and second burners 9A and 9B also becomes stagnant and its volume increases, and it becomes easier to act on the heat shield plate 92. The above-described problems become more prominent.

Japanese Patent No. 4718593

The present invention has been conceived under the circumstances as described above, and it is possible to appropriately heat the partition member and the heat shield plate that partition the flame generation areas of the two burners to high temperatures by simple means. It is an object of the present invention to provide a combustion device that can be prevented or suppressed.

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

  A combustion apparatus provided by the present invention includes first and second burners accommodated side by side in a burner case that receives an upward air supply from a fan, and each of the first and second burners. A partition member provided in an upright state in the burner case so as to partition the upper flame generation regions, and a heat shield provided along the side surface so as to cover the side surface of the partition member; A first air outlet is provided at the upper end between the partition member and the heat shield, and a part of the air supplied from the fan is allowed to flow upward. A lower horizontal plate portion that protrudes in a direction away from the partition member from the upper side region of the heat shield plate, and a lower horizontal plate formed in the lower side region of the heat shield plate. Downward from the tip edge A combustion apparatus provided with a lower upright plate portion that is bent and faces and approaches one of the side surfaces of the first and second burners, wherein the heat shield plate is air that has flowed into the air flow path. A first or second burner in which the lower upright plate portion faces and approaches as an air outlet for allowing a part of the lower outlet plate to flow out from a position lower than the first air outlet to the facing region of the heat shield plate, And it has the 2nd air outflow port provided in the position higher than each of the said lower horizontal board part, It is characterized by the above-mentioned.

In the present invention, each of the first and second burners includes a plurality of burner bodies arranged in a horizontal direction at a predetermined arrangement pitch, and the lower standing plate portion of the heat shield plate is opposed to the lower burner plate portion. An interval between the approaching first or second burner and the partition member may be smaller than the arrangement pitch.
Further, in the present invention, unlike the above, the burner case is used for mounting a plurality of burners capable of mounting a plurality of burner bodies constituting the first and second burners side by side at a predetermined arrangement pitch. The first or second burner having an area and the lower upright plate portion of the heat shield plate facing and approaching the burner mounting area closer to the partition member among the plurality of burner mounting areas The main body is not mounted, and the interval between the first or second burner where the lower upright plate portion opposes and the partition member is larger than the predetermined arrangement pitch.

  According to the present invention, since the position of the second air outlet is higher than the position of the conventional air outlet, the air flow generated by discharging from the second air outlet is changed to the heat shield plate. It can effectively advance to the upper area of the partition member, or it can function as an air flow that effectively prevents the approach of the flame or high-temperature combustion gas toward the upper area of the heat shield or the partition member. It becomes. Accordingly, it is preferable to appropriately prevent the heat shield plate and the upper region of the partition member from being heated to a high temperature, which has been difficult in the prior art, and to prevent thermal damage to the heat shield plate and the like.

  In the present invention, it is preferable that the lower horizontal plate portion of the heat shield plate is provided with a third air outlet for allowing the air flowing into the air flow path to pass upward.

  According to such a configuration, an air layer is formed along the surface layer portion of the region below the second air outlet in the upper side region of the heat shield plate, and flame or high-temperature combustion gas is formed in that region. It is also possible to appropriately prevent such an approach. When the distance between the upper side region of the heat shield plate and the first or second burner is short, the flame easily approaches the upper side region of the heat shield plate, but the above configuration is more suitable in such a case. is there.

  In this invention, Preferably, the said 2nd air outflow port is provided in the standing-like part of the said heat insulation board, and is opened in the horizontal direction.

  According to such a configuration, air basically flows out from the second air outlet in a substantially horizontal direction. Therefore, for example, when the flame of the burner is generated at a location near the upper side region of the heat shield plate, there is a risk that this flame may approach the heat shield plate in a substantially horizontal direction. This is preferable in preventing this efficiently.

  In the present invention, preferably, the heat shield plate is provided with an additional horizontal plate portion that exists at a position higher than the lower horizontal plate portion, and the second outlet is provided on the additional horizontal plate portion. It is provided and opens in the vertical direction.

  According to such a configuration, since the air layer can be formed along the surface layer portion of the upper region of the heat shield plate above the second air outlet, the heat shield plate This is preferable for protecting a wide range of the upper region. When the distance between the upper region of the heat shield and the burner is relatively large, high-temperature combustion gas stays in the region between them, and a wide range of the upper region of the heat shield is heated to a high temperature. Although there is a possibility, according to the said structure, it is preferable in order to eliminate such a fear.

  In the present invention, preferably, the width of the additional horizontal plate portion is smaller than the width of the lower horizontal plate portion in a direction in which the heat shield plate and the partition member face each other.

  According to such a configuration, in the heat shield plate, the region between the additional horizontal plate portion and the lower horizontal plate portion is prevented from coming close to the burner side, and this region is heated to a high temperature. This is advantageous for prevention.

  In the present invention, preferably, the height of the upper edge of the lower upright plate portion of the heat shield plate is higher than that of the first or second burner with which the lower upright plate portion faces and approaches.

  According to such a configuration, since the lower upright plate portion of the heat shield plate rises above the burner along the burner, the combustion gas and flame rising upward from the burner are directed to the heat shield plate side. It is possible to suppress the phenomenon spreading toward. As a result, the region where the heat shield plate is heated to a relatively high temperature shifts upward, and air is concentratedly applied to the region and its peripheral region from the second air outlet, It is possible to efficiently suppress the temperature of the region of the region from becoming high temperature. Even if the lower standing plate portion of the heat shield plate rises upward along the burner, if the standing height is moderate (for example, about 3 mm or less), a high-temperature flame directly touches the lower standing plate portion. This can be suppressed, and this part can be appropriately avoided from being overheated.

  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 front sectional drawing which shows an example of the combustion apparatus which concerns on this invention. It is II-II sectional drawing of FIG. It is a principal part expanded sectional view of FIG. FIG. 2 is a perspective view of a heat shield plate used in the combustion apparatus shown in FIG. 1. It is a plane sectional view of the primary heat exchanger used with the combustion device shown in FIG. It is front sectional drawing which shows the other example of the combustion apparatus which concerns on this invention. It is a principal part expanded sectional view of FIG. FIG. 7 is a perspective view of a heat shield plate used in the combustion apparatus shown in FIG. 6. It is explanatory drawing which shows an example of a prior art.

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

  The combustion device C1 shown in FIGS. 1 and 2 is configured as a hot water device capable of hot water heating. The combustion apparatus C1 includes first and second burners 5A and 5B that generate combustion gas, a burner case 2 that accommodates them, a fan 30 for supplying combustion air into the burner case 2, first and second burners. The primary heat exchanger HE1 and the secondary heat exchanger HE2 that recover heat from the combustion gas generated by the two burners 5A and 5B are provided.

  The primary heat exchanger HE1 and the secondary heat exchanger HE2 are both of a one-can two-circuit system, and the heat transfer tubes T1 and T2 are accommodated in the can body 6 in the primary heat exchanger HE1. In the secondary heat exchanger HE2, heat transfer tubes T3 and T4 are accommodated in the case 7. The heat transfer tubes T1, T3 are for performing hot water heating for general hot water supply, for example, and the heat transfer tubes T2, T4 are for performing hot water heating for bath hot water supply or for heating, for example. The first and second burners 5A and 5B correspond to such a configuration.

  The primary heat exchanger HE1 is a sensible heat recovery heat exchanger, and a plurality of fins 18a and 18b are attached to the heat transfer tubes T1 and T2. As shown in FIG. 5, the heat transfer tubes T <b> 1 and T <b> 2 are a plane in which a plurality of straight tubular body portions 11 to which fins 18 a and 18 b are attached are connected in series through a substantially U-shaped coupling tubular body portion 12. Visually meandering. Such meandering heat transfer tubes T1 and T2 are provided in a single stage (one stage) in the vertical height direction. As a result, the primary heat exchanger HE1 can be thinned. A partition member 19 is provided between the heat transfer tubes T1 and T2. Tubes 12a and 12b having water inlets 15a and 15b are connected to the straight tube part 11 located on the outer end side of the heat transfer tubes T1 and T2. The hot water that has entered the water inlets 15a and 15b flows in one direction through each of the heat transfer tubes T1 and T2, and then the end as the outlet of the straight tube portion 11 near the center in the width direction of the can 6 Hot water is discharged from 16a and 16b.

  1 and 2, the secondary heat exchanger HE2 is for further recovering latent heat from the combustion gas that has passed through the primary heat exchanger HE1. Each of the plurality of heat transfer tubes T3, T4 is formed as a spiral tube having a different size and is arranged in an overlapping manner, and both upper and lower end portions thereof are drawn out of the case 7 to be header 75a. To 75d. Incoming water from the outside to the combustion device C1 is made to the headers 75b and 75d, and hot water individually passing through the heat transfer tubes T2 and T4 is supplied from the headers 75a and 75c to the inlets 15a and 15b of the heat transfer tubes T1 and T2. .

  As shown in FIG. 2, the case 7 of the secondary heat exchanger HE2 has, for example, an air supply port 71 on the bottom wall portion 70a and an exhaust port 72 on the front wall portion 70b. The combustion gas whose sensible heat has been recovered by the heat transfer tube T1 of the primary heat exchanger HE1 flows into the case 7 from the air supply port 71, passes through the gap of the heat transfer tube T3, and reaches the exhaust port 72. In such a process, latent heat is recovered from the combustion gas by the heat transfer tube T3. Although not shown in the drawings, the combustion gas that has been subjected to sensible heat recovery by the heat transfer tube T2 of the primary heat exchanger HE2 acts on the heat transfer tube T4, and the latent heat recovery is performed by the heat transfer tube T4. Has been. The heat transfer tubes T3 and T4 are partitioned by a partition member 74 (see FIG. 1).

1st and 2nd burner 5A, 5B is a gas burner, for example, and is comprised using the some burner main body 50 (combustion pipe). As each burner main body 50, the same one as in the past can be used, and the details thereof are omitted. However, the whole is relatively flat, and a fuel gas inlet 51 is provided at the lower part of one end in the longitudinal direction. And has an elongated rectangular flame hole 52 in plan view. An opening 22 facing the fuel gas inlet 51 is provided in the front wall of the burner case 2, and a part of the air discharged from the fan 30 is supplied to the opening 22. It has become. On the other hand, a fuel gas supply header 31 is attached to the front side of the burner case 2, and the fuel gas can be ejected from the gas ejection nozzle 32 of the header 31 into the opening 22. Fuel gas and combustion air (primary air) are mixed and supplied into the burner body 50 from the opening 22 and the fuel gas inlet 51, and this burns in the flame hole 52. The plurality of burner bodies 50 are provided side by side at a predetermined arrangement pitch in the left and right lateral width direction of the burner case 2.

  A partition member 29 and a pair of heat shield plates 8 are provided in the burner case 2. The partition member 29 is configured using, for example, a thin metal plate, and stands up so as to partition between the first and second burners 5A and 5B and between the flame generation regions above them. Is provided.

  The pair of heat shield plates 8 are members for protecting both side surfaces of the partition member 29. In the present embodiment, each of the pair of heat shield plates 8 has the same shape and size. Further, the distance between each of the first and second burners 5 </ b> A and 5 </ b> B and the partition member 29 is relatively small, and the distance is smaller than the arrangement pitch of the burner main bodies 50.

  3 and 4, the heat shield plate 8 is formed by pressing a thin metal plate, and the uppermost horizontal plate portion 80 is formed on one side edge thereof. It has a connected main upright plate portion 81, a lower horizontal plate portion 82 connected to the lower end edge of the main upright plate portion 81, and a lower upright plate portion 83 connected so as to bend downward from the leading edge. . The heat shield plate 8 is also provided with first to third air outlets 84a to 84c.

  The uppermost horizontal plate portion 80 can be supported on the upper end of the partition member 29, and the heat shield plate 8 is attached in a standing state along the partition member 29 by this support. The main upright plate portion 81 is provided with a plurality of protruding portions 85 a that protrude toward the partition member 29, and by contacting these protruding portions 85 a against the side surfaces of the partition member 29, the heat shield plate 8. An air flow path 27 is formed between the partition member 29 and the partition member 29 as a gap. As shown in FIG. 1, a rectifying plate 26 is provided below the first and second burners 5A and 5B, and the air discharged from the fan 30 passes through the vent holes 26a of the rectifying plate 26. Then proceed upward in the burner case 2. This air is used as secondary air for driving the combustion of the first and second burners 5A and 5B, and part of the air enters the air flow path 27 from below. The uppermost horizontal plate portion 80 is provided with a first air outlet 84a, so that the air that has entered the air flow path 27 travels upward without stagnation in the air flow path 27. And passes through the first air outlet 84a. This air then flows along the side surface of the partition member 19 of the primary heat exchanger HE1, and exhibits the effect of cooling this portion.

  The height of the upper surface of the lower horizontal plate portion 82 is substantially the same as the height of the first and second burners 5A and 5B. The lower upright plate portion 83 faces and approaches one of the side surfaces of the first and second burners 5A and 5B. However, the lower upright plate portion 83 has a protruding portion 85b having a relatively small protruding dimension, and the protruding portion 85b is in contact with one of the side surfaces of the first and second burners 5A and 5B. . Thus, a gap is formed between the first and second burners 5 </ b> A and 5 </ b> B and the lower upright plate portion 83 so that air can flow. A plurality of third air outlets 84 c are provided in the lower horizontal plate portion 82. Since the third air outlet 84c is provided to open in the vertical height direction, a part of the air that has entered the lower portion of the air flow path 27 is directed upward from the third air outlet 84c. leak.

  As shown well in FIG. 4, a plurality of second air outlets 84 b are provided at positions near the upper portion of the main upright plate portion 81. In the present embodiment, in order to avoid interference with the protrusion 85a, some of the second air outlets 84b are provided above the protrusion 85a. In the present embodiment, the second air outlet 84 b is not provided over the entire length of the heat shield plate 8 in the lateral width direction, and is not provided in the vicinity of the left and right side edges of the heat shield plate 8. This is because the central portion of the heat shield plate 8 in the width direction is more easily heated to a higher temperature than both side edges. Of course, unlike the present embodiment, the second air outlet 84b may be provided over substantially the entire length of the heat shield plate 8 in the lateral width direction. The second air outlet 84b opens in the horizontal direction. Therefore, basically, air can be ejected from the second air outlet 84b in a substantially horizontal direction. An inclined portion 81d is provided at the upper portion of the main upright plate portion 81, which partitions the first air outlet 84a from the partition member 29 while separating it from other portions of the main upright plate portion 81. It helps to reduce the distance between the member 29.

  The combustion apparatus C1 is also provided with a side plate 24 as means for preventing the side wall 20 of the burner case 2 from being heated to a high temperature. The side plate 24 has a cross-sectional shape as shown in FIG. 3, but the configuration is that the second air outlet 84 b is not provided as compared with the heat shield plate 8 described above. It is different. This is because the side wall 20 of the burner case 2 is less likely to be heated to a high temperature as compared with the partition member 29 disposed closer to the center in the burner case 2. Since the basic configuration of the side plate 24 other than the above is the same as that of the heat shield plate 8, its detailed description is omitted. The air supplied from the fan 30 flows between the side wall 20 of the burner case 2 and the side plate 24, and this air flows upward from the air outlets 24a and 24b. Therefore, the side plate 24 can be air-cooled. Further, the effect of forming an air layer along the surface layer portion of the side plate 24 can also alleviate the action of the flame and high-temperature combustion gas contacting the side plate 24. The air that has traveled upward from the air outlet 24a exhibits the action of cooling the side wall of the can 6 of the primary heat exchanger HE1.

  Next, the operation of the above-described combustion apparatus C1 will be described.

  First, the effect that the back surface of the heat shield plate 8 and the outer surface of the partition member 29 are cooled by the air flowing through the air flow path 27 formed between the heat shield plate 8 and the partition member 29 is obtained. Further, since air is flowing upward from the third air outlet 84 c, an air layer is formed in the vicinity of the surface layer portion of the main upright plate portion 81. In the present embodiment, as described above, the distance between the first and second burners 5A and 5B and the partition member 29 is short, and the main upright plate of the first and second burners 5A and 5B and the heat shield plate 8 is used. The part 81 is relatively close. Therefore, the air layer formed by the air flowing out from the third air outlet 84c is useful for protecting the lower side of the main upright plate portion 81 and the intermediate height region. However, like the prior art described with reference to FIG. 9, the third air outlet 84 c is at a low height, and the air flowing out from here is above the main upright plate portion 81 and at a height in the vicinity thereof. It is difficult to reach as a proper air flow.

  On the other hand, in the present embodiment, since the second air outlet 84b is provided in a portion near the upper portion of the main upright plate portion 81, the air that flows out from the second air outlet 84b is used. Thus, it is possible to appropriately suppress the upper portion of the main upright plate portion 81 and the vicinity thereof from being heated to a high temperature. In particular, the second air outflow port 84b basically discharges air in the horizontal direction. If such air outflow is performed, for example, a flame generated at a position close to the main upright plate portion 81. As a result, it is possible to efficiently suppress the movement in the horizontal direction as it is and approach the main upright plate portion 81. For this reason, in this combustion apparatus C1, it is possible to appropriately prevent the heat shield plate 8 from being overheated and to protect the partition member 29 accurately.

  6 to 8 show other embodiments of the present invention. In these drawings, elements that are the same as or similar to those in the above embodiment are denoted by the same reference numerals as those in the above embodiment, and redundant description is omitted.

  In the combustion apparatus C2 shown in FIG. 6, the number of burner bodies 50 of the second burner 5B is reduced by one as compared with the previous combustion apparatus C1, and the second burner 5B and the partition member 29 The interval is large. Corresponding to this, a heat shield plate 8A is used as a heat shield plate on the second burner 5B side. The other basic configuration is the same as that of the previous combustion device C1.

  More specifically, the burner case 2 has a plurality of burner mounting areas in which a plurality of burner bodies 50 can be mounted side by side at a predetermined arrangement pitch. In this case, the burner body 50 is not intentionally mounted, so that the heating power (ability) of the second burner 5B is lowered, and the second burner 5B is set so as to correspond to the actual load. Therefore, in this combustion device C2, if one burner body 50 is added, the combustion device C1 of the previous embodiment can be manufactured, and the main parts of the combustion devices C1 and C2 can be shared, and their manufacturing costs can be reduced. It is possible to reduce. Since the burner body 50 is reduced by one, the interval between the second burner 5B and the partition member 29 is larger than the arrangement pitch of the burner bodies 50. This is because the flame of the second burner 5B is far from the partition member 29 and the heat shield plate 8A, but the space S1 between the heat shield plate 8A and the upper area of the second burner 5B is increased, Hot combustion gas tends to stay. In particular, this phenomenon becomes more prominent when the gap between the fins 18b of the primary heat exchanger HE1 becomes clogged.

  As best shown in FIGS. 7 and 8, the heat shield plate 8A has an additional horizontal plate portion 81c at an intermediate height position of the main upright plate portion 81, and the additional horizontal plate portion 81c. In addition, a plurality of second air outlets 84d are provided. The second air outlet 84d is open in the vertical direction. The second air outlet 84d is provided so that the opening ratio of the heat shielding plate 8A near the center in the left-right width direction is larger than the opening near both side edges. This is the same as the reason why the second air outlet 84b described above is provided only in the central portion. The second air outlet 84d may also be provided so that the aperture ratios at various locations in the width direction of the heat shield plate 8A are substantially uniform.

  The width La of the lower horizontal plate portion 82 is increased, which corresponds to the large interval between the partition member 29 and the second burner 5B. On the other hand, the additional horizontal plate portion 81c is formed to be narrower than the lower horizontal plate portion 82, and the width is required to form the second air outlet 84d with a predetermined opening area. The minimum width or a width close thereto. The heat shield plate 8A is not provided with a portion corresponding to the third air outlet 84c of the above embodiment.

The main upright plate portion 81 is provided with a plurality of projections 85a that protrude toward the partition member 29 side, but the lower portion 81b of the additional horizontal plate portion 81c is second than the upper portion 81a. It is located near the burner 5B. For this reason, the partition member 29 is provided with a convex portion 29a for contacting the protruding portion 85a of the lower portion 81b so that the heat shield plate 8A does not tilt. Unlike the present embodiment, for example, a configuration in which only the protruding portion 85a having a large protruding dimension and a large size is provided without providing the protruding portion 29a, or the protruding dimension without providing the protruding portion 85a is employed. In the case of adopting means such as providing only the enlarged protrusion 29a as a whole, these portions are factors that greatly impede the air flow in the air flow path 27. The size of the part 85a and the convex part 29a can be reduced, and such a problem can be suppressed. The heat shield plate 8A is inserted after the burner main body 59 constituting the second burner 5B is assembled. Therefore, when a means for providing a protruding portion having a large protruding dimension is adopted, the protruding portion easily comes into contact with another member when the heat insulating plate 8A is inserted, and the heat insulating plate 8A is deformed by this contact. Alternatively, the burner body 50 may be damaged. On the other hand, if the structure of this embodiment is employ | adopted, such a problem can also be solved.

  The heat shield plate 8A is set so that the upper edge portion of the lower upright plate portion 83 is higher than the second burner 5B by a predetermined height H1 (see FIG. 7). The height H1 is about 3 mm, for example. With such a height, in the normal combustion drive of the second burner 5B, the lower upright plate portion 83 is prevented from being directly exposed to the high-temperature flame or is difficult to be exposed, and this portion is improperly overheated. It is possible to avoid becoming a state.

  Next, the operation of the above-described combustion apparatus C2 will be described.

  First, since a relatively large space portion S1 exists between the second burner 5B and the main upright plate portion 81 of the heat shield plate 8A, the flame of the second burner 5B is transferred to the heat shield plate 8A. There is little possibility of direct contact. On the other hand, when the gap between the fins 18b of the primary heat exchanger HE1 becomes clogged, high-temperature combustion gas stays in the space S1, and this combustion gas stays above the heat shield plate 8A and its upper part. It becomes easy to act on the vicinity region. On the other hand, since the heat shield plate 8A allows air to flow upward from the second air outlet 84d provided at the intermediate height of the main upright plate portion 81, the above-described combustion gas is likely to act. Air can be efficiently supplied to the region, and an air layer can be formed along the surface layer portion of the region. As a result, it is possible to appropriately prevent the upper portion of the heat shield plate 8A and the vicinity thereof from being overheated.

  Since the upper edge part of the lower upright plate part 83 is higher than the second burner 5B by the height H1, it is suppressed that the flame of the second burner 5B spreads to the heat shield plate 8A side at a low position. Then, the region where the high-temperature combustion gas acts on the heat shield plate 8A shifts upward. If the region where the high-temperature combustion gas acts in this way shifts upward, the height of the second air outlet 84d is increased correspondingly, and cooling air is efficiently concentrated in the region. Thus, it is possible to obtain an advantage that it is possible to more accurately prevent the region from becoming high temperature.

  The heat shield plate 8A is not provided with the third air outlet 84c. However, as described above, in this combustion device C2, the high-temperature combustion gas and flame are located below the main upright plate portion 81. It is difficult to act on the portion 81b. Therefore, there is no particular problem due to the absence of the third air outlet 84c. However, the third horizontal air outlet 84c may be further provided in the lower horizontal plate portion 82.

  The present invention is not limited to the contents of the above-described embodiment. The specific configuration of each part of the combustion apparatus according to the present invention can be modified in various ways within the intended scope of the present invention.

  It is desirable to provide a pair of left and right heat shield plates so as to protect both the left and right side surfaces of the partition member. However, if either one of the pair of heat shield plates is a configuration intended by the present invention. Even if the other is not, it is included in the technical scope of the present invention. The heat shield plate can be manufactured by pressing a metal plate, but the manufacturing method is not limited. It is also possible to provide a heat resistant coating layer on the surface of the heat shield plate. Moreover, the heat shield plate does not necessarily have to be formed using a single member, and may be configured by connecting a plurality of members. A partition member can also be made into the form different from thin plate shape.

  The combustion apparatus which concerns on this invention can be comprised as a combustion apparatus of the aspect different from the hot water supply apparatus (hot water apparatus) provided with the heat exchanger. For example, it can be configured as a combustion apparatus for heating. The burner is not limited to a gas burner, and for example, an oil burner can also be used.

C1, C2 Combustion device HE1 Primary heat exchanger HE2 Secondary heat exchanger 2 Burner cases 5A, 5B First and second burners 8, 8A Heat shield plate 27 Air flow path 29 Partition member 30 Fan 50 Burner body 82 Lower part Horizontal flat plate portion 83 Lower upright plate portions 84a to 84c First to third air outlets 84d Second air outlet

Claims (8)

First and second burners housed side by side horizontally in a burner case receiving an upward air supply from a fan;
A partition member provided in an upright state in the burner case so as to partition between the flame generation regions above each of the first and second burners;
A heat shield provided along the side surface so as to cover the side surface of the partition member;
With
An air flow path that has a first air outlet at the upper end between the partition member and the heat shield plate and that allows a part of the air supplied from the fan to flow upward. Formed,
The lower side region of the heat shield plate is bent downward from the lower horizontal plate portion projecting in a direction away from the partition member than the upper side region of the heat shield plate, and the leading edge of the lower horizontal plate portion. A lower standing plate portion facing and approaching one of the side surfaces of the first and second burners,
The heat shield plate serves as an air outlet for allowing a part of the air flowing into the air flow path to flow out from a position lower than the first air outlet to the facing region of the heat shield plate. A combustion apparatus comprising: a first or second burner in which the plate portions oppose each other, and a second air outlet provided at a position higher than each of the lower horizontal plate portions. The combustion device according to claim 1,
The combustion apparatus, wherein the lower horizontal plate portion of the heat shield plate is provided with a third air outlet for allowing the air flowing into the air flow path to pass upward. The combustion apparatus according to claim 1 or 2,
The second air outlet is a combustion apparatus that is provided in an upright portion of the heat shield plate and opens in a horizontal direction. The combustion apparatus according to claim 2 or 3,
Each of the first and second burners is composed of a plurality of burner bodies arranged in a horizontal direction at a predetermined arrangement pitch,
The combustion apparatus, wherein an interval between the partition member and the first or second burner in which the lower upright plate portion of the heat shield plate faces and approaches is smaller than the arrangement pitch. The combustion apparatus according to claim 1 or 2,
The heat shield plate is provided with an additional horizontal plate portion present at a position higher than the lower horizontal plate portion,
The second outlet is a combustion device that is provided in the additional horizontal plate portion and opens in a vertical direction. A combustion apparatus according to claim 5, wherein
The combustion apparatus, wherein a width of the additional horizontal plate portion is smaller than a width of the lower horizontal plate portion in a direction in which the heat shield plate and the partition member face each other. The combustion device according to claim 5 or 6,
The burner case has a plurality of burner mounting areas capable of mounting a plurality of burner bodies constituting the first and second burners side by side at a predetermined arrangement pitch,
As for the 1st or 2nd burner which the said lower standing board part of the said heat shield plate opposes, the burner main body is mounted | worn in the burner mounting area near the said partition member among the said several burner mounting areas. It is not configured and
The combustion apparatus, wherein an interval between the first or second burner that the lower upright plate portion faces and approaches and the partition member is larger than the predetermined arrangement pitch. A combustion apparatus according to any one of claims 1 to 7,
The combustion apparatus, wherein a height of an upper edge of the lower upright plate portion of the heat shield plate is higher than that of the first or second burner to which the lower upright plate portion faces and approaches.

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