JP2008045760A - Burner unit, combustion device and hot water supply device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a combustion device having a high rigidity partitioning member, and preventing cracking and damage of the partitioning member even when thermal stress acts thereon, and to provide a hot water supply device comprising the combustion device. <P>SOLUTION: In a burner unit 30, air flow channel members 35, 35 are disposed at both sides of an intermediate member 36 formed by integrating a premixing member 32 and a burner port member 33. The air flow channel member 35 is constituted by combining two sheets of first and second partitioning wall components 80, 81, and the components 80, 81 are respectively provided with transverse recessed grooves 100, 101 extending toward the longitudinal direction of the components. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a burner unit capable of burning fuel gas by a so-called two-stage combustion method, a combustion apparatus provided with the burner unit, and a hot water supply apparatus provided with the burner unit or the combustion apparatus.

  Combustion devices are main components of water heaters and bath devices, and are widely used not only in factories but also in general households.

  In recent years, environmental destruction caused by acid rain has become a serious social problem, and there is an urgent need to reduce the total amount of NOx (nitrogen oxide) emissions. Therefore, in order to solve such a problem, a combustion apparatus that employs a combustion method called a so-called concentration combustion method as disclosed in Patent Documents 1 and 2 below has been provided.

  Further, as a combustion apparatus that generates a small amount of NOx accompanying the combustion operation, for example, a combustion apparatus called a so-called two-stage combustion method, such as a combustion apparatus disclosed in Patent Documents 2 and 3 below, is employed. Are known. In the two-stage combustion method, fuel gas is injected in an oxygen-deficient state, and the gas is ignited to generate a primary flame for combustion. This is a combustion type in which secondary air is supplied to generate a secondary flame.

Japanese Patent Laid-Open No. 5-118516 JP-A-6-126788 JP-A-52-143524

  Combustion devices employing the light and dark combustion method as in Patent Documents 1 and 2 have a low NOx generation amount and are well received in the market. However, this type of combustion apparatus has a disadvantage that the turn-down ratio (Turn Down Ratio TD) is small. In particular, a combustion apparatus that employs the light and dark combustion method has a drawback that it is difficult to burn in a region where the calorific value is small.

  More specifically, when the lean combustion method is adopted, as described above, the main flame is burned with a lean low-concentration mixed gas obtained by premixing about 1.6 times the theoretical air amount into the fuel gas. In addition, the combustion operation is performed by burning a high-concentration mixed gas having a high concentration of fuel gas in the vicinity thereof to generate a double flame.

  By the way, although the combustion apparatus which employs the light and dark combustion method includes a blower to send in air necessary for the combustion of the mixed gas, the amount of blown air may decrease due to aging of the blower, clogging of the filter, or the like. . When the amount of blown air decreases in this way, the amount of air in the mixed gas supplied for main flame formation decreases, and the combustion speed of the mixed gas tends to increase. For this reason, if the combustion operation is performed in a region where the heat generation amount is small in a situation where the blown air amount is reduced, the base end portion of the flame may approach the flame hole and damage the flame hole. Therefore, in the combustion apparatus adopting the light and dark combustion method, there is a problem that the combustion in a region where the calorific value is small must be limited in anticipation of the secular change, and the turndown ratio is accordingly reduced.

  On the other hand, a combustion apparatus that employs a two-stage combustion method has a feature that a turn-down ratio can be made higher than that of a combustion apparatus that employs a concentration combustion method. However, when the two-stage combustion method is employed as the combustion mode, the combustion state tends to become unstable because the fuel gas needs to be burned in a state where oxygen is insufficient when the primary flame is formed. For this reason, there are no practical hot water heaters that are currently on the market that employ the two-stage combustion method. Therefore, the present inventors made a prototype of a burner unit 200 as shown in FIG. 28 and repeated the experiment for the purpose of providing a combustion apparatus employing a two-stage combustion method.

  The burner unit 200 has a main part composed of a premixing member 201, a flame hole member 202, and a partition wall member 203 shown in FIG. A single burner unit 200 can be used, but a plurality of burner units 200 are often used side by side as shown in FIG. When the burner units 200 are used side by side as shown in FIG. 28A, the partition member 203 is shared by the adjacent burner units 200, 200, and the premixing member 201 and the flame hole member are interposed between the partition members 203, 203. An intermediate member 205 formed by combining 202 is disposed.

  The partition member 203 has a main part formed by bending a single steel plate or the like, and has an air flow path through which air introduced from the outside flows. The partition wall member 203 is disposed so as to extend toward the downstream side in the flow direction of the premixed gas (upward in FIG. 28) with respect to the intermediate member 205 with the bent portion as the leading end side. The partition member 203 includes an air supply port 203a on the tip side.

  The burner unit 200 has a combustion section 206 in a region surrounded by the intermediate member 205 and the partition members 203 and 203 arranged on both sides thereof. The region on the flame hole member 202 side of the combustion unit 206 is a region functioning as a first combustion region 207 for forming a primary flame, and the region on the tip side of the partition wall member 203 is a second combustion region 208. It is an area that functions as In the second combustion region 208, unburned fuel gas contained in the gas flowing from the first combustion region 207 using the air supplied from the air opening 203 a provided at the tip of the partition wall member 203. Is burned to form a secondary flame.

  Here, when the present inventors repeated a combustion experiment using the burner unit 200 described above, the partition member 203 is heated to a high temperature in accordance with the combustion operation, but the temperature of the partition member 203 tends to vary depending on the part. Turned out to be. Further, in the combustion experiment of the present inventors, the central portion in the longitudinal direction becomes higher than both longitudinal end portions of the partition wall member 203, and the thermal stress (stress) acting due to the temperature rise accompanying the combustion operation varies depending on the part. It has been found. That is, it has been found that when the partition member 203 is heated with the combustion operation of the burner unit 200, local stress concentration may occur in the partition member 203. Therefore, it has been found that when the burner unit 200 is used for a long period of time, the partition wall member 203 may be plastically deformed or the partition wall member 203 may be cracked.

  Further, when a plurality of burner units 200 are arranged as shown in FIG. 28A to create the combustion apparatus 210, only a part of the burner units 200 (hereinafter, referred to as the burner units 200a as necessary) is operated to burn, and the rest It is also possible to operate the combustion device 210 in a combustion mode in which the burner unit 200 (hereinafter referred to as the burner unit 200b as necessary) does not perform the combustion operation. In the case of such a configuration, a large thermal stress acts on the partition member 203 located at a position separating the combustion portions 206 (hereinafter referred to as the combustion portions 206a and 200b as necessary) of the burner units 200a and 200b, There was a possibility of plastic deformation and cracking.

  That is, when the burner units 200 are arranged side by side, the partition member 203 at the boundary between the combustion part 206a where the combustion operation is performed and the combustion part 206b where the combustion operation is not performed is heated on the surface on the combustion part 206a side. While the temperature is high, the surface on the combustion unit 206b side is in an unheated state. Therefore, the partition member 203 at the boundary between the combustion parts 206a and 206b has a large temperature difference between the surface on the combustion part 206a side and the surface on the combustion part 206b side, and there is a possibility of deformation or cracking. .

  Based on such knowledge, the present invention provides a burner unit that is unlikely to crack or damage the partition wall member even when thermal stress is applied to the partition wall member, a combustion apparatus including the burner unit, and the burner unit or combustion described above. An object of the present invention is to provide a hot water supply apparatus including the device.

  Accordingly, the invention according to claim 1, which is provided to solve the above-described problem, is a premixing member capable of premixing fuel gas and air to form a premixed gas, and the premixing member. A flame hole member disposed on the downstream side in the flow direction of the premixed gas, and a partition wall disposed on the side of the flame hole member and projecting toward the downstream side in the flow direction of the premixed gas supplied from the flame hole member And a combustion part surrounded by the partition member and the flame hole member and extending in a longitudinal direction of the partition member, and the combustion part flows in the flow direction of the premixed gas supplied from the flame hole member A first combustion region on the upstream side, and a second combustion region on the downstream side in the flow direction of the premixed gas with respect to the first combustion region and on the leading end side of the partition wall member; The supplied premixed gas is less than the theoretical air amount in the first combustion region. It is possible to burn under the amount of air, and to supply the second combustion region with air that is more than the amount of air that is insufficient to completely burn the premixed gas in the combustion in the first combustion region. The burner unit is characterized in that a step portion comprising a concave portion and / or a convex portion extending in the longitudinal direction of the partition wall member is provided in a portion facing the combustion portion of the partition wall member. .

  In the burner unit of the present invention, the partition wall member has a portion facing the combustion portion, and a step portion extending in the longitudinal direction of the partition wall member is provided at the portion. Therefore, the partition member employed in the burner unit of the present invention has high rigidity. Further, since the stepped portion as described above is provided, even if the partition member is heated during the combustion operation, the stress acting on the partition member along with this is dispersed in the longitudinal direction of the partition member, and the leveling is performed. can do. Therefore, the burner unit of the present invention can provide a burner unit that is less likely to cause cracks or damage to the partition member even when thermal stress associated with the combustion operation acts on the partition member.

  Here, as described above, the stress acting on the partition wall member may vary depending on the part of the partition wall member with the combustion operation. When such a phenomenon is assumed, the stepped portion is constituted by a plurality of concave portions and convex portions, and if these lengths are adjusted according to the magnitude of the stress assumed to act in accordance with the combustion operation, the partition member There is a high possibility that the stress acting on each part can be more accurately distributed and leveled.

  Therefore, in the invention according to claim 2 provided based on such knowledge, the step portion is provided so that a plurality of concave portions and / or convex portions having different lengths are intermittently arranged in the longitudinal direction of the partition wall member. It is a thing, It is a thing, The burner unit of Claim 1 characterized by the above-mentioned.

  According to such a configuration, it is possible to provide a burner unit that can disperse the stress acting on each part of the partition wall member with combustion operation more accurately and can be leveled.

  Here, according to the above-described combustion experiment by the present inventors, there is a high possibility that the central portion in the longitudinal direction becomes high temperature compared to the longitudinal end portion side of the partition wall member. Therefore, when the combustion operation is performed in the burner unit according to claim 1 or 2, the central part in the longitudinal direction of the partition wall member becomes hotter than the end part, and a larger stress than the end part acts on the central part in the longitudinal direction. There is a high possibility of doing.

  Therefore, in the invention according to claim 3 provided based on such knowledge, the length of the concave portion and / or the convex portion constituting the step portion provided on the longitudinal direction end portion side of the partition member is: 3. The burner unit according to claim 1, wherein the burner unit is longer than that provided on the center side in the longitudinal direction of the partition wall member.

  In the burner unit of the present invention, since the concave portion and the convex portion provided on the end portion side in the longitudinal direction of the partition member are longer than those provided on the end portion side, the partition member has particularly high rigidity in the vicinity of the center portion. Therefore, in the burner unit of the present invention, even when a larger stress is applied to the central part of the partition member than the end part due to the combustion operation, the partition member is cracked or the partition member is damaged. Can be reliably prevented.

  Here, in the burner unit described in each of the above claims, the step portion may be provided in only one row in the portion facing the combustion portion of the partition wall member, but is provided in a plurality of rows. (Claim 4).

  In the case of such a configuration, the rigidity of the partition member can be further improved as compared with the case where the stepped portion is only one row.

  In the burner unit of the present invention, the step portion may be provided over a plurality of rows over the entire length in the longitudinal direction of the partition wall member, or only a part may be provided over the plurality of rows. Further, the number of rows of the stepped portions can be appropriately changed depending on the position of the partition wall member.

  Here, as described above, the partition member included in the burner unit described in each claim has a portion facing the combustion portion, and is heated in accordance with the combustion operation. Therefore, when the partition member is provided with an air flow path like the partition member 203 of the combustion apparatus 200 prototyped by the inventors as described above, when the combustion operation is performed in the combustion section, the air flow path The air flowing through the air is heated and expanded more than before or immediately after the combustion operation, and the flow path resistance tends to increase. Therefore, when an opening for releasing the air supplied to the combustion section is provided on a surface that does not intersect the air flow flowing through the air flow path of the partition wall member, the opening is interposed through the opening depending on the heating state of the air. As a result, the amount of air supplied to the combustion section may fluctuate and the combustion state may become unstable.

  Therefore, in the invention according to claim 5 provided based on such knowledge, the partition member intersects the air flow path through which air can flow and the flow direction of the air introduced into the air flow path. And an opening capable of discharging air flowing through the air flow path is provided in the intersection surface, and the air discharged through the opening is supplied to the combustion unit. It is a burner unit given in any 1 paragraph of Claims 1-4.

  In the burner unit of the present invention, when air flows through the air flow path of the partition member, a part or all of this air hits the intersecting surface regardless of its heating state, and is discharged through the opening provided in the intersecting surface. And supplied to the combustion section. That is, the burner unit of the present invention is configured such that the intersecting surface is provided with dynamic pressure from the air flow flowing through the air flow path, and an opening is provided in the intersecting surface. For this reason, the burner unit of the present invention has a high temperature of the air flowing through the air flow path to a certain degree, such as when it has passed for a while after the start of combustion, even when the temperature of the air flowing through the air flow path is low at the initial stage of combustion. Thus, even when the air is inflated, the amount of air released toward the combustion section through the opening provided in the intersecting surface becomes substantially uniform. Moreover, since the burner unit of the present invention has a stable amount of air released to the combustion section, the combustion state is also stable regardless of the air temperature.

  In the invention according to claim 6, there is a premixed gas inflow space into which the premixed gas supplied from the premixed member can flow in between the premixed member and the flame hole member, and the premixed gas inflow space is in the premixed gas inflow space. On the other hand, it has an air mixing channel capable of introducing air and a side channel through which air supplied to the side of the premixed gas discharged from the flame hole member flows, and is in the middle of the air mixing channel A mixing channel crossing surface that intersects the flow direction of the air introduced into the air mixing channel is provided, and a side channel that communicates with the side channel at the mixing channel crossing surface. The burner unit according to any one of claims 1 to 5, wherein a communication opening is provided.

  In the burner unit of the present invention, an air mixing channel capable of introducing air into the premixed gas inflow space is provided, and a mixing channel crossing surface is provided in the middle. In addition, a side channel communication opening is provided on the crossing surface of the mixing channel, and the air mixing channel supplies air to the side of the premixed gas discharged from the flame hole member via the opening. Is in communication with the side flow path.

  Here, in the burner unit of the present invention, the mixing channel intersecting surface intersects the flow direction of the air introduced into the air mixing channel. In other words, the mixing channel crossing surface is at a position where the dynamic pressure due to the air flow introduced into the air mixing channel is received. For this reason, the burner unit of the present invention has a temperature of the air introduced into the air mixing channel, that is, regardless of the degree of expansion of the air, through the side channel communication opening provided in the air channel crossing surface. Part of the air flowing through the air mixing channel can be branched into the side channel, and the air necessary for the combustion of the premixed gas released from the flame hole member can be supplied. Therefore, the burner unit of the present invention is necessary for stably burning the premixed gas to the side of the premixed gas discharged from the flame hole member regardless of the temperature of the air flowing through the air mixing channel. A sufficient amount of air can be supplied.

  Here, the burner unit described in each of the above claims is disposed inside the case member, and is used in a state where the region of the combustion portion is defined by the wall surface of the case member and other members disposed along the wall surface. It can be configured. In this case, if the premixed gas released from the flame hole member is burned in the combustion part, the wall surface of the case member and the other member are heated to a high temperature, and the case member and the other member may deteriorate over time. I can't deny it.

  Therefore, the invention according to claim 7 provided based on such knowledge is arranged inside the predetermined case member, so that the wall surface of the case member or another member arranged along the wall surface, The region of the combustion portion is defined on the end side in the longitudinal direction of the partition wall member, and an air flow path through which air can flow and an air discharge port communicating with the air flow path are formed inside the partition wall member. A part or all of the air flowing through the air flow path is provided to the wall surface of the case member that defines the region of the combustion part or other members disposed along the wall surface through the air discharge port. The burner unit according to any one of claims 1 to 6, wherein the burner unit can be released.

  In the burner unit of the present invention, an air discharge port is provided in the burner unit, and air flowing through an air flow path provided inside the partition wall member can be discharged toward the wall surface of the case member via the burner unit. . In addition, when there is another member arranged along the wall surface of the case member, the air discharged through the air discharge port can be discharged toward the other member. Therefore, even when the burner unit of the present invention is housed in the case member in the above-described form and used, the case member and other members become excessively hot due to the combustion operation in the combustion part. It is possible to prevent the member of the material from aging.

  The invention according to claim 8 is a combustion apparatus having a case member and a blower means, wherein a plurality of burner units according to any one of claims 1 to 6 are arranged in the case member. A partition member disposed along the wall surface between one or both longitudinal sides of the burner unit and the wall surface of the case member, and the partition member is separated from the wall surface of the case member. And a cooling air passage is formed between the casing member and the wall surface of the case member, and the cooling air flow is activated by the operation of the blowing means. A combustion apparatus characterized in that outside air is introduced into a road.

  In the combustion apparatus of the present invention, the partition member disposed along the wall surface of the case member abuts at the longitudinal end of the burner unit, and a cooling air flow path is formed between the partition member and the wall surface of the case member. Has been. And the combustion apparatus of this invention becomes a structure by which external air is supplied to a cooling air flow path, if a ventilation means operates. Therefore, in the combustion apparatus of the present invention, even when each burner unit performs a combustion operation and the combustion part becomes high temperature, the case member and the partition member are heated by the outside air (air) flowing through the cooling air flow path. Can be prevented.

  In the combustion apparatus of the present invention, the partition member is urged in a direction away from the wall surface of the case member, and is in contact with the longitudinal end portion of the burner unit. Therefore, the combustion apparatus of the present invention can prevent the air flowing through the cooling air flow path from leaking to the burner unit side.

  In the invention according to claim 9, the case member is provided with a protrusion that protrudes toward the inside of the case member, and the protrusion can contact the partition member. The combustion apparatus according to claim 8, wherein a distance between the casing and the wall surface of the case member is a predetermined distance or more.

  In the combustion apparatus of the present invention, a protrusion is provided on the case member, the protrusion abuts on the partition member, and the distance between the wall surface of the case member and the partition member is equal to or greater than a predetermined interval. For this reason, in the combustion apparatus of the present invention, a space having a predetermined interval or more can be secured as a cooling air flow path between the wall surface of the case member and the partition member.

  The invention according to claim 10 includes a combustion means for burning fuel gas, and a heat exchange means capable of heating the liquid using the thermal energy generated by the combustion operation in the combustion means. A hot water supply apparatus comprising the burner unit according to any one of claims 1 to 7 or the combustion apparatus according to any one of claims 8 or 9 as means.

  Since the hot water supply apparatus of the present invention includes the burner unit according to each of the above claims or the combustion device as a combustion means, the partition member constituting the burner unit is cracked even if thermal stress acts on the partition member. It is difficult to cause or damage. Therefore, according to the present invention, it is possible to provide a hot water supply device that is less likely to fail or be damaged due to aging of the combustion means.

  According to the present invention, even when thermal stress is applied to the partition wall member, the partition wall member is not easily cracked or damaged, the combustion device including the burner unit, and the burner unit and the combustion device described above are provided. A hot water supply apparatus can be provided.

  Next, a hot water supply device 1 and a combustion device 10 according to an embodiment of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, the hot water supply device 1 is provided with a blower means 3, a heat exchange means 5, a combustion means 6, an exhaust means 7, and the like inside a box-shaped main body 2. The hot water supply apparatus 1 supplies the fuel introduced from the outside through a gas introduction pipe (not shown) to the combustion means 6 from the gas nozzle 8 and burns it. The heat generated thereby causes the hot water supplied to the heat exchange means 5 and The heating medium is heated.

  The hot water supply device 1 of the present embodiment is characterized by the configuration of the combustion device 10 that constitutes the combustion means 6. More specifically, as shown in FIG. 2, the combustion means 6 includes a case member 11 and a combustion device 10 disposed therein.

  The combustion apparatus 10 has a configuration in which a plurality of burner units 30 as shown in FIG. 3 are arranged side by side in the case member 11 so that a flame can be formed upward (to the heat exchange means 6 side). The burner unit 30 functions alone as a combustion device, and a main part is constituted by the premixing member 32, the flame hole member 33, and the air flow path member 35 (partition wall member).

  More specifically, the burner unit 30 (combustion device) can realize so-called two-stage combustion. As shown in FIGS. 2 to 6 and the like, the premixing member 32 and the flame hole member 33 are combined. The air flow path member 35 is disposed on both sides of the intermediate member 36 configured as described above, and the combustion portion 34 is formed in a region defined by the flame hole member 33 and the air flow path member 35 on both sides. Yes. In other words, in the burner unit 30, the intermediate member 36 and the combustion part 34 are sandwiched between the air flow path members 35 and 35.

  As will be described in detail later, the burner unit 30 is housed inside the case member 11 as shown in FIG. 22 and the like, and the portions on both ends in the longitudinal direction of the burner unit 30 are on the wall surface of the case member 11. It is obstructed by a set plate 180 inserted along. Therefore, the combustion unit 34 is partitioned by the set plate 180 at both ends in the longitudinal direction of the burner unit 30.

  Moreover, in the combustion apparatus 10 of this embodiment, as shown in FIG. 2, it is set as the structure which shared the air flow path member 35 between adjacent burner units 30. FIG. Therefore, the combustion apparatus 10 also has a configuration in which an air flow path member 35 is interposed between a plurality of intermediate members 36 and combustion portions 34 provided.

  The premixing member 32 has a stubborn appearance as shown in FIG. 7, and is provided for mixing fuel gas and air supplied via a gas introduction pipe (not shown). The premixing member 32 is pressed into a single steel plate to provide irregularities, and is bent to form a front wall 32a and a back wall 32b, and these outer peripheral portions are welded so that gas does not leak. Thus, a space (mixing flow path 37, opening row portion 38) in which fuel gas or air can flow is formed. That is, by bending the steel plate with the irregularities as described above so that the front wall 32a and the back wall 32b face each other, the front wall 32a and the back wall 32b are formed as shown in FIGS. A part that is almost in close contact with the front wall 32a and the back wall 32b can be separated with a gap, and the separated part functions as the mixing flow path 37 and the opening row part 38.

  As shown in FIG. 7, the premixing member 32 is roughly divided into a mixing channel 37 and an opening row portion 38. The mixing channel 37 is on the lower side of the premixing member 32, and one end communicates with a gas inlet 40 provided at the lower corner (lower left side in FIG. 7) of the premixing member 32, and the other end is preliminarily provided. The flow path communicates with the opening row portion 38 inside the mixing member 32. The mixing channel 37 has a constricted portion 41 whose channel cross-sectional area is temporarily constricted on the downstream side in the flow direction of the fuel gas or air with respect to the gas introduction port 40, and the cross-sectional area gradually decreases further on the downstream side. There is an enlarged diameter portion 43 that increases. Further, the mixing channel 37 has a uniform cross section 45 having a uniform cross section on the downstream side of the enlarged diameter portion 43.

  In the mixing channel 37, the channel linearly extends in a section from the gas inlet 40 to the uniform cross section 45 through the throttle portion 41 and the enlarged diameter portion 43. On the other hand, in the uniform cross section 45, the flow path is bent substantially vertically upward at the end portion, and is connected to the opening row portion 38 inside the premixing member 32.

  The opening row portion 38 is located at the upper end portion of the premixing member 32 and extends over the entire longitudinal direction as shown in FIG. The cross-sectional shape of the opening row portion 38 has a two-stage shape as shown in FIGS. 8 and 9, and is roughly divided into an upper step portion 38a and a lower step portion 38b. The upper step portion 38a is narrower than the lower step portion 38b, that is, the gap between the front wall 32a and the back wall 32b is narrower.

  The upper step part 38 a has a flat top part 46 and has vertical walls 47, 47 extending vertically downward from both sides of the top part 46. The vertical walls 47, 47 each have a lower end portion that extends toward the outside of the premixing member 32, and this end portion is connected to the lower step portion 38 b described above.

  As shown in FIG. 7, the vertical walls 47 and 47 are provided with a number of openings 48. The openings 48 are provided in a row in the longitudinal direction of the premixing member 32 with a certain interval. In the present embodiment, the opening 48 is provided only on the front side and the back side of the opening row portion 38, that is, on the front wall 32 a side and the back wall 32 b side, and is not provided on the top portion 46.

  The lower step portion 38b is a space that exists below the upper step portion 38a and extends in the longitudinal direction of the premixing member 32 in the same manner as the upper step portion 38a. As shown in FIGS. 8 and 9, the lower step portion 38b has vertical walls 49, 49 extending substantially vertically downward. The lower step portion 38b communicates with the rising portion of the uniform cross section 45 of the mixing channel 32 as shown in FIGS.

  Next, the configuration of the flame hole member 33 will be described. As shown in FIG. 5, the flame hole member 33 is a member that is mounted so as to cover the top portion 46 side of the premixing member 32 described above. As shown in FIG. 5 and FIG. 10, the flame hole member 33 has a configuration in which the main body member 50 is the center and a decompression wall 51 is welded and attached to both sides thereof.

  The main body member 50 is formed into a box shape by subjecting a single steel plate to press working to provide irregularities, and subjecting this to bending processing, spot welding, and the like. As shown in FIG. 10, the main body member 50 has a top surface 55, long side surfaces 56 and 57 perpendicular to the top surface 56, and short side surfaces 58 and 59, and a surface (part) facing the top surface 55 is open. Has been.

  As shown in FIGS. 5 and 10, the top surface 55 is long and elongated. Further, as shown in FIGS. 10 and 11, the top surface 55 has a shape in which the central ridge line portion 55 a is the highest, and is gently inclined downward toward the long side surfaces 56 and 57 with this as a boundary. It has become. The flame hole member 33 is formed by bending a steel plate as described above. As shown in FIG. 11, the steel plate is located inside the main body member 50 at the ridge line portion 55a of the top surface 55 (downward in FIG. 4 and the like). A vertical wall 55b is formed that is folded toward the inside and protrudes substantially vertically downward toward the internal space of the main body member 50.

  The top surface 55 of the main body member 50 is provided with a slit-like opening (hereinafter referred to as a flame hole 60) that functions as a flame hole of the combustion unit 34 described later in the burner unit 30. The flame hole 60 is opened to extend in the width direction of the top surface 55. A large number of flame holes 60 are provided throughout the top surface 55.

  Each flame hole 60 provided in the top surface 55 is arranged in parallel to the longitudinal direction of the top surface 55. Further, a flame hole group 61 is formed on the top surface 55 with a predetermined number (three in the present embodiment) of flame holes 60 provided in parallel as a set. Each flame hole group 61 is arranged on the top surface 55 at regular intervals.

  The long side surfaces 56 and 57 are formed by bending both end portions in the width direction (short direction) of the top surface 55 downward about 90 ° with respect to the top surface 55, and are long wall surfaces in the longitudinal direction of the main body member 50. It is.

  Focusing on the cross-sectional shape of the main body member 50, as shown in FIG. 11 and the like, the long side surfaces 56 and 57 are provided with two upper restricting portions 62 and 62 and lower restricting portions 63 and 63, respectively. ing. In other words, the long side surfaces 56 and 57 of the main body member 50 have two upper bulging portions 65 and lower bulging portions 66 except for the base end portion. The bulging portions 65 and 65 are provided in a portion continuous with the top surface 55 described above, and the bulging portions 66 and 66 are located on the proximal end side (lower end side) of the main body member 50 with respect to the bulging portions 65 and 65. ). Further, upper restricting portions 62, 62 exist between the bulging portions 65, 65 and the bulging portions 66, 66, and a lower restricting portion is provided between the bulging portions 66, 66 and the base end portion of the main body member 50. 63, 63 exist.

  The lower end side of the bulging portion 65 and the upper end side portion of the throttle portion 62, and the lower end side of the bulging portion 66 and the upper end side portion of the throttle portion 63 respectively extend toward the lower side of the main body member 50. It is gently connected through inclined surfaces 68 and 69 inclined inward. Further, the lower end side of the restricting portion 62 and the upper end side portion of the bulging portion 66, and the lower end side of the restricting portion 63 and the base end portion of the main body member 50 are respectively in the lower direction of the main body member 50. It is gently connected via inclined surfaces 70 and 71 that are inclined outward.

  As shown in FIG. 10 and the like, the upper bulging portion 65 and the lower bulging portion 66 described above are respectively provided over the entire longitudinal direction of the flame hole member 33. In addition, a plurality of openings 67 having a small opening area are provided in the upper bulging portions 65 and 65 in a row in the longitudinal direction of the flame hole member 33.

  A plurality of protrusions 64 are provided on the lower restricting portions 63 and 63. The protrusion 64 protrudes outward from the surface of the lower throttle parts 63 and 63 in a state where the main body member 50 is viewed from the surface side, and forms a groove on the inner side of the main body member 50. The protrusion 64 extends in the height direction of the flame hole member 33 (up and down direction in FIG. 10 and the like). And the groove | channel formed in the back side of the protrusion 64, ie, the inner side of the main body member 50, is formed so that the above-mentioned inclined surfaces 69 and 71 may be connected.

  Further, as shown in FIGS. 10 and 11, communication holes 73, 71 are formed on the inclined surfaces 71, 71 (mixing flow path intersecting surfaces) connecting the lower throttle parts 63, 63 and the base end side of the flame hole member 33. 73 (side channel communication port) is provided. As shown in FIG. 10, the communication holes 73, 73 are present at positions between the plurality of protrusions 64, 64 provided side by side in the longitudinal direction of the flame hole member 33 in the lower throttle portion 63.

  As shown in FIG. 11, the long side surfaces 56 and 57 are folded back by about 90 ° twice on the base end side (open end side) of the main body member 50, and are composed of a bottom wall 72 a and an outer wall 72 b. Concave grooves 72 and 72 are formed. The bottom wall 72 a protrudes outward of the main body member 50 substantially perpendicularly to the long side surfaces 56 and 57. Further, the outer wall 72 b rises substantially vertically upward with respect to the bottom wall 72 a and is substantially parallel to the long side surfaces 56 and 57.

  The outer walls 72b and 72b are provided with protrusions 72c and 72c protruding toward the long side surfaces 56 and 57 at positions on both ends in the longitudinal direction of the main body member 50. The long side surfaces 56 and 57 are provided with protrusions 72d and 72d protruding toward the outer walls 72b and 72b. These protrusions 72c and 72d are used to lock the air flow path member 35 described later in detail.

  The decompression wall 51 is fixed to the upper end portions of the long side surfaces 56 and 57 of the main body member 50. The decompression wall 51 is a long plate-like body as shown in FIGS. As shown in FIG. 11, the decompression wall 51 has a cross-sectional shape from the upper bulging portion 65 provided on the long side surface 56 or the long side surface 57 to the middle part of the lower bulging portion 66, that is, the upper bulging portion 65. The cross-sectional shape of the inclined surface 68, the throttle portion 62, the inclined surface 70, and the downward bulging portion 66 is approximated and fixed along these portions.

  In the flame hole member 33, a gap 75 (side flow path) exists between the long side surfaces 56 and 57 of the main body member 50 and the decompression wall 51. The gap 75 is open on the upper side in the state shown in FIG. This opening portion functions as a side flame hole 76. Note that a small protrusion 77 is formed on the inner surface of the decompression wall 51 as shown in FIG. 11, and the protrusion 77 is in contact with the long side surfaces 56 and 57. Thereby, the space | interval of the side flame hole 76 is ensured more than the protrusion part of the protrusion 77. FIG.

  Here, as described above, the upper bulging portion 65 is provided with a plurality of openings 67 arranged in a line, and the inside and outside of the main body member 50 communicate with each other through the openings 67. Further, as described above, the decompression wall 51 is attached to the outside of the upper bulging portion 65 via a predetermined gap 75. Further, the upper side of the gap 75 is opened via the side flame hole 76 and the lower side is closed. Therefore, when a gas flows into the internal space of the flame hole member 33, the gas flows out to the gap 75 side through the opening 67 as shown by a two-dot chain line in FIG. It will flow toward.

  Next, the air flow path member 35 will be described. The air flow path member 35 is a member having the most characteristic configuration in the present embodiment, and is a wall-like member having a thin external shape as shown in FIGS. The air flow path member 35 is disposed on the side of the premixing member 32 and the flame hole member 33 described above, and the air necessary for the combustion of the fuel gas supplied from the flame hole member 33 and the premixed gas containing the fuel gas, It serves as a flow path for supplying to a position suitable for combustion and as a partition that separates adjacent burner units 30.

  The air flow path member 35 is configured by combining a first partition wall structure 80 as shown in FIG. 14 and a second partition wall structure 81 as shown in FIG. As shown in FIGS. 12 and 13, the air flow path member 35 is a hollow member whose front end side (upper end side in FIG. 12 and the like) is closed and whose base end side (lower end side in FIG. 12 and the like) is opened. There is an air passage 82 which will be described later in detail.

  First, the first and second partition member structures 80 and 81 constituting the air flow path member 35 will be described in detail. The planar view is constituted by a substantially rectangular steel plate. In the state shown in FIGS. 14 and 15, the first and second partition members 80 and 81 become the tip side when the upper end side (hereinafter referred to as the upper end portions 80 a and 81 a) is assembled as the air flow path member 35. The lower end side (hereinafter referred to as the lower end portions 80b and 81b) is the portion that becomes the base end portion of the air flow path member 35. The first and second partition members 80 and 81 are roughly divided into three regions from the upper end portions 80a and 81a to the lower end portions 80b and 81b, respectively.

  More specifically, the first and second partition members 80 and 81 are roughly divided into regions A to C from the upper end portions 80a and 81a side. The region A is a region extending from the upper end portions 80a, 81a of the first and second partition members 80, 81 to about に in the height direction (vertical direction in FIGS. 12 and 13), and a tip region 130 described later. It is a part which constitutes. In addition, the region B is a region that is located approximately in the center of the first and second partition members 80 and 81 and is a part that configures an intermediate region 131 described later. The region C is a region that exists on the lower end side of the first and second partition members 80 and 81, and is a part that forms a base end region 132 described later.

  The first and second partition wall structures 80 and 81 are formed in the region A and valley folds L1 and peaks extending linearly in the width direction of the first and second partition wall structure bodies 80 and 81 (left and right direction in FIGS. 14 and 15). And a folded portion L2. The valley fold portion L1 is present on the upper end portions 80a and 81a side of the mountain fold portion L2. As shown in FIGS. 12 and 13, the first and second partition members 80 and 81 are valley-folded when viewed from the outside of the air flow path member 35 along the valley fold portion L1 when the air flow path member 35 is assembled. It is bent so as to be in a state, and is bent along the mountain fold portion L2 so as to be in a mountain fold state as viewed from the outside of the air flow path member 35.

  The portions on the upper end portions 80 a and 81 a side of the first partition member structures 80 and 81 on the side of the upper end portions 80 a and 81 a are the portions constituting the engaging portion 90 in the assembled state of the air flow path member 35. Further, the portion from the valley fold portion L1 to the mountain fold portion L2 is a portion constituting the inclined surfaces 91 and 94 in the assembled state of the air flow path member 35.

  The first and second partition members 80 and 81 are configured such that a large number of engagement pieces 85 and 86 and engagement notches 87 and 88 are provided at the upper end portions 80a and 81a of the region A. The engagement pieces 85 and the engagement notches 87 are provided alternately in the width direction (longitudinal direction) of the first partition wall structure 80. Similarly, the engagement pieces 86 and the engagement notches 88 are provided alternately in the width direction (longitudinal direction) of the second partition wall structure 81. The engagement pieces 85 and 86 are hatched portions in FIG. 14A and FIG. 15A, and before the air flow path member 35 is assembled, FIG. 14B and FIG. As shown in FIG. 2, the main parts of the first and second partition members 80 and 81 are bent in a substantially vertical direction.

  The engaging pieces 85 and 86 are piece-like portions that are bent from the upper end portions 80a and 81a of the first partition structure members 80 and 81 toward the back surface side, respectively. It is used to engage with each other at the distal end portion of the air flow path member 35. Further, the engagement notches 87 and 88 are notches provided on the upper end portions 80a and 81a side of the first partition members 80 and 81, respectively, and the engagement pieces 85 and 86 are formed when the air flow path member 35 is assembled. It is a part to be engaged. More specifically, the engagement piece 85 on the first partition wall structure 80 side engages with an engagement notch 88 provided on the second partition wall structure 81 side in the assembled state of the air flow path member 35. The engagement piece 86 on the second partition wall structure 81 side is a part that engages with an engagement notch 87 provided on the first partition wall structure 80 side. The width of the engagement notches 87 and 88 (the length in the left-right direction in FIGS. 14 and 15) is substantially the same as the width of the engagement pieces 85 and 86.

  Of the engagement pieces 85 and 86 described above, engagement pieces 85 and 86 (hereinafter referred to as engagement pieces 85a and 86a as required) that are present at substantially the center in the longitudinal direction of the first and second partition members 80 and 81. 14) is partially cut away as shown in FIG. 14 (c) and FIG. 15 (c), and is partially different in shape from those provided in other parts. More specifically, the other engagement pieces 85 and 86 except for the engagement pieces 85a and 86a have portions indicated by hatching H1 in FIGS. 14 (c) and 15 (c). The portion 86a is cut out to form cutouts 83 and 84. On the other hand, the engagement pieces 85a and 86a are provided with protrusions 83a and 84a that do not exist in the other engagement pieces 85 and 86, as indicated by hatching H2 in FIGS. 14C and 15C. It has been configured.

  When the first and second partition wall structures 80 and 81 are assembled into the air flow path member 35, the notches 83 and 84 arrive at the same place, that is, at substantially the center in the longitudinal direction of the air flow path member 35, A notch 89 for fire transfer is formed. The notch portion for fire transfer 89 communicates the space on the first partition wall structure 80 side and the space on the second partition wall structure 81 side separated by the air flow path member 35. As shown in FIG. 2, the notch 89 for fire transfer communicates the two combustion parts 34, 34 separated by the air flow path member 35 when a large number of burner units 30 are arranged in the case member 11. Yes, it is used to assist in the transfer of fire between the two combustion parts 34, 34.

  The protruding portions 83a and 84a protrude toward the upper end portions 80a and 81a to the same extent as the bending positions of the engaging pieces 85 and 86 described above, or to the extent that they do not reach this position slightly. As shown in FIG. 17 (b), the engagement piece 85b existing at a position adjacent to the notch 83 on the first partition wall structure 80 side is formed on the protrusion 84a provided on the second partition wall structure 80 side. It is folded to the first partition structure 80 side so as to be covered, and a so-called goblet folded state is obtained. Thereby, the protruding portion 84a is folded by the engagement piece 85b. And as shown in FIG.17 (b), most of the clearance gaps s formed inside the bent engagement piece 85b will be in the state obstruct | occluded in the edge part by the side of the notch 83. FIG.

  Similarly, the engagement piece 86b existing at a position adjacent to the notch 84 on the second partition wall structure 81 side is bent so as to cover the protrusion 83a provided on the first partition wall structure 80 side. Accordingly, the protruding portion 83a is folded by the engaging piece 86b, and the majority of the gap s formed inside the bent portion of the engaging piece 85b is closed by the protruding portion 83a.

  As shown in FIGS. 14 and 15, long slits 92 and 93 (openings) are provided in the region A described above. The long slits 92 and 93 are slits extending from substantially the center in the width direction of the engagement notches 87 and 88 to the lower side of the first and second partition members 80 and 81, respectively. The long slits 92 and 92 each extend to the extent that the ends slightly exceed the above-described mountain fold L2. That is, the long slits 92 and 92 linearly extend downward from the engaging portion 90 of the air flow path member 35 beyond the inclined surface 91 as shown in FIG.

  In a region sandwiched between the valley folds L1 and the mountain folds L2 of the first partition members 80 and 81, that is, in the portion constituting the inclined surface 91 in the air flow path member 35, a number of short slits 95 and 96 ( Opening) and openings 97, 98 are provided. As shown in FIG. 14C and FIG. 15C, the short slits 95 and 96 pass through substantially the center in the width direction of the portion where the engagement pieces 85 and 86 are provided, and the imaginary line V extending in the vertical direction. It exists above or in the vicinity. The short slits 95 and 96 extend linearly from the vicinity of the valley fold L1 to a position slightly beyond the mountain fold L2.

  As shown in FIGS. 12, 14, 15, etc., the openings 97 and 98 are formed in the region between the valley fold portion L <b> 1 and the mountain fold portion L <b> 2, i. A large number of first and second partition members 80 and 81 are provided in a row on the inclined surface 91 provided in the longitudinal direction. The openings 97 and 98 are provided so as to have a symmetrical positional relationship via the short slit 95 or the virtual line V in each region shifted downward from the portion where the engagement pieces 85 and 86 are provided.

  The openings 97 and 98 are not provided in the regions on the extensions of the notches 83 and 84 described above, that is, in the regions indicated by hatching H3 in FIG. 14C and FIG. In other words, the openings 97 and 98 are provided at positions outside the region on the extension of the notches 83 and 84.

  Further, in the region A, below the long slits 92 and 93 and the short slits 95 and 96 (on the base end side), a plurality of lateral concave grooves 100 and 101 (steps) and a large number of Longitudinal grooves 102 and 103, round recesses 105 and 106, and long recesses 107 and 108 are provided. The lateral grooves 100 and 101 extend linearly in the longitudinal direction (width direction) of the first and second partition member 80 and 81, respectively. A plurality of lateral concave grooves 100 and 101 are provided in a row at predetermined intervals in the width direction of the first and second partition wall constituting members 80 and 81, respectively. Further, each of the horizontal concave grooves 100 and 101 is recessed from the outer surface to the inner surface in the assembled state of the air flow path member 35.

  The horizontal concave grooves 100 and 101 will be described in more detail. These grooves 100 and 101 take into consideration that thermal stress acts on the air flow path member 35 when the burner unit 30 performs a combustion operation. , 2 is provided to increase the rigidity of the partition members 80, 81. The lateral concave grooves 100 and 101 are provided in the first and second partition wall constituting members 80 and 81 in the region A in a plurality of rows in the longitudinal direction, and are arranged in a row intermittently, but act on the air flow path member 35. Considering that the thermal stress differs for each part of the air flow path member 35 in the longitudinal direction, the length varies depending on the part provided.

  More specifically, when the burner unit 30 of the present embodiment performs a combustion operation, the vicinity of the center portion in the longitudinal direction of the air flow path member 35 tends to be higher than the vicinity of both end portions in the longitudinal direction. Therefore, in the burner unit 30 of the present invention, the stress applied to the vicinity of the central portion in the longitudinal direction of the air flow path member 35 during the combustion operation tends to be greater than the stress applied to the vicinity of both end portions. Therefore, in the burner unit 30 of the present embodiment, as shown in FIG. 14 and FIG. 15, the lateral groove 100 at the center in the longitudinal direction of the first and second partition wall constituting members 80 and 81 constituting the air flow path member 35. 101 (100a, 101a) and the length L1 to L3 of the lateral concave grooves 100 (100b, 100c, 101b, 101c) on both sides thereof, both longitudinal end portions of the first and second partition wall constituting members 80, 81 The lengths L4 and L5 of the lateral concave grooves 100 (100d, 100e, 101d, 101e) are longer.

  The round recess 105 and the long recess 107 described above are provided in the first partition wall constituting member 80, respectively, and the round recess 106 and the long recess 108 are provided in the second partition wall constituting member 81, respectively. The circular recesses 105 and 106 are substantially circular recesses in plan view provided in the first and second partition wall constituting members 80 and 81, and are recessed from the outside to the inside of the air flow path member 35. Two round recesses 105, 106 are provided on the lower end side of the region A of the first and second partition members 80, 81. The round recesses 105 and 106 extend from both longitudinal ends of the first and second partition wall constituting members 80 and 81 to the width of the first partition wall constituting member 80 (the length in the left-right direction in the state shown in FIGS. 14 and 15). On the other hand, it is provided at a position shifted about 1/3 to the center side.

  The long concave portions 107 and 108 are provided in the first and second partition member 80 and 81, and are concave portions having a streamline shape as shown in FIGS. The long recesses 107 and 108 are also recessed toward the inside of the air flow path member 35 in the same manner as the round recesses 105 and 106. The shape of the long concave portions 107 and 108 will be described in detail. The long concave portions 107 and 108 are formed by arranging a great circle and a small circle with their centers separated in the vertical direction and connecting the two with a common tangent. It has substantially the same planar shape as the extended shape. The long concave portions 107 and 108 are arranged so that the large circle side portion faces the lower side (base end side) of the air flow path member 35 and the small circle side portion faces the upper side (tip end side). Further, the common tangent line connecting the two circles constituting the outer extension of the long recesses 107 and 108 has an inclination of 30 ° or less with respect to the line connecting the centers of the circles.

  The longitudinal grooves 102 and 103 are provided in the first and second partition wall constituting members 80 and 81, respectively. In the height direction of the first and second partition wall constituting members 80 and 81, that is, in the state shown in FIGS. It extends linearly in the vertical direction and is provided below the lateral grooves 100 and 101. In addition, a large number of the longitudinal grooves 102 and 103 are provided so as to be arranged substantially in parallel at a predetermined interval in the longitudinal direction of the first and second partition members 80 and 81, respectively. Of the longitudinal grooves 102 and 103, those having the above-described round recesses 105 and 106 and long recesses 107 and 108 on their extensions are shorter than the others so that they only reach these recesses. ing.

  The first and second partition members 80 and 81 are in the region A, and the bulging portions 127a and 127b and the bulging portion 128a are located at both longitudinal ends of the first and second partition member members 80 and 81. , 128b. The bulging portions 127a and 127b and the bulging portions 128a and 128b are respectively formed on the surface side of the first and second partition wall constituting members 80 and 81, that is, the air flow path member 35 as shown in FIGS. 14 (d) and 15 (d). When it is assembled, it bulges out in the direction of the outside. As shown in FIG. 12 and FIG. 13B, the bulging portions 127 a and 128 a are combined in the assembled state of the air flow path member 35, and the air discharge port 145 is provided at one end in the longitudinal direction of the air flow path member 35. It is a part that forms. Similarly, the bulging portions 127 b and 128 b are also combined in the assembled state of the air flow path member 35, and an air discharge port 146 similar to the air discharge port 145 is formed on the other end side of the air flow path member 35. It is a part to do.

The first and second partition members 80 and 81 have stepped portions 110 and 111 as shown in FIG. 12 and FIGS. The step portions 110 and 111 are provided so as to extend linearly in the longitudinal direction of the first and second partition wall constituting members 80 and 81 as shown in FIGS. As shown in FIGS. 13 and 16, the first and second partition members 80 and 81 have portions corresponding to the region B with the stepped portions 110 and 111 as boundaries in the assembled state as the air flow path member 35. It is formed so as to bulge outward with respect to the portion corresponding to. Further, the stepped portions 110 and 111 are
As it goes to the outside of the air flow path member 35, it is gently inclined downward (base end side). Furthermore, as shown in FIGS. 12, 14, 15, etc., a large number of openings 112, 113 are arranged in rows in the longitudinal direction of the first and second partition members 80, 81 in the step portions 110, 111. Is provided.

  As shown in FIGS. 5 and 12, etc., a plurality of protrusions 115 and 116 are provided in the region B of the first and second partition members 80 and 81, respectively. As will be described later in detail, the protrusions 115 and 116 are in contact with the outer surface of the intermediate member 36 to form a gap therebetween. As shown in FIG. 12 and the like, the protrusions 115 and 116 linearly extend in the up-down direction in a state assembled as the air flow path member 35 and project outward.

  Under the protrusions 115 and 116, recesses 117 and 118 are provided. The recessed portions 117 and 118 are portions that are recessed toward the inner side (air channel 82 side) in the assembled state of the air channel member 35. The recesses 117 and 118 are recessed in a valley shape when viewed from the outside of the air flow path member 35.

  As shown in FIG. 13 and FIG. 16, the recesses 117, 118 are configured so that the surfaces constituting the upper side portions (hereinafter referred to as upper inclined surfaces 117 a, 118 a as necessary) are below the air flow path member 35 ( As it goes toward (upstream side), it inclines gently toward the inside, forming a surface facing downward. Further, the lower surfaces of the recesses 117 and 118 (hereinafter referred to as downward inclined surfaces 117b and 118b as necessary) are configured as the first and second partition walls toward the lower side (upstream side) of the air flow path member 35. It inclines so that it may go to the outer side of the bodies 80 and 81, and comprises the surface which faced upwards.

  As shown in FIG. 13B, the recesses 117 and 118 are formed inside the air flow path member 35 when the first and second partition wall constituting members 80 and 81 are assembled as the air flow path member 35. The air flow path 82 is narrowed. The lower inclined surfaces 117b and 118b (intersection surfaces) constituting the recesses 117 and 118 intersect with the streamlines of air (outside air) introduced from the air introduction port 133 formed at the lower end of the air flow path 82. To do.

  In the recesses 117 and 118, openings 119 and 120 are provided in the downward inclined surfaces 117b and 118b. Here, as described above, the lower inclined surfaces 117b and 118b of the recesses 117 and 118 are inclined upward. Therefore, the openings 119 and 120 are also opened upward in the state where the air flow path member 35 is installed as shown in FIG. Further, as described above, the lower inclined surfaces 117b and 118b of the recesses 117 and 118 intersect the streamlines of the air flow introduced into the air flow path 82 in the assembled state of the air flow path member 35, respectively. Therefore, a part of the air introduced into the air flow path 82 hits the lower inclined surfaces 117b and 118b and is discharged to the outside of the air flow path member 35 through the openings 119 and 120.

  As shown in FIGS. 14 and 15, longitudinal concave grooves 121 and 122 are provided in a region C corresponding to the lower end (base end) side of the first and second partition members 80 and 81. The longitudinal concave grooves 121 and 122 are grooves that extend linearly in the vertical direction of the first and second partition members 80 and 81, respectively. In addition, lateral concave grooves 123 and 125 are provided below the vertical concave grooves 121 and 122. The lateral grooves 123 and 125 extend over the entire length in the longitudinal direction of the first and second partition members 80 and 81, respectively. The lateral concave grooves 123 and 125 are used for alignment with these members when the burner unit 30 and the combustion apparatus 10 are combined with the premixing member 32 and the flame hole member 33, respectively. The vertical concave grooves 121 and 122 and the horizontal concave grooves 123 and 125 are both recessed inward from the surface side in the assembled state of the air flow path member 35.

  The first and second partition members 80, 81 have flange portions 80c, 80d and flange portions 81c, 81d at both ends in the longitudinal direction. Engagement portions 147a and 147b and engagement portions 148a and 148b are provided at substantially the center portions of the flange portions 80c and 80d and the flange portions 81c and 81d. The engaging portions 147a and 147b and the engaging portions 148a and 148b protrude outward in the longitudinal direction of the first and second partition members 80 and 81, respectively, but their substantially central portions are notched.

  As described above, the air flow path member 35 is configured by combining the first and second partition members 80 and 81. That is, as shown in FIG. 16, the air flow path member 35 is in a state where the first and second partition members 80 and 81 are opposed to each other, and the engagement pieces 85 and 86 provided on the respective upper end portions 80a and 80b are provided. The front end side is integrated by engaging with the notches 88 and 87 for engagement.

  More specifically, when the first and second partition members 80 and 81 are in a state where both ends in the longitudinal direction are aligned, the second partition member 80 and 81 are located at the positions where the engagement pieces 85 are provided in the first partition member 80. The engagement notch 88 provided in the partition wall structure 81 arrives, and the engagement notch 87 provided in the first partition wall structure 80 arrives at the position where the engagement piece 86 is provided in the second partition wall structure 81. . In this state, as shown in FIG. 12, the engagement piece 85 on the first partition wall configuration body 80 side is folded toward the second partition wall configuration body 81 side, and the upper end portion 81 a of the second partition wall configuration body 81 is folded. It is said. Similarly, the engagement piece 86 on the second partition wall structure 80 side is bent toward the first partition wall structure 80 side, and the upper end portion 80a of the first partition wall structure 80 is folded.

  The portion where the upper end portion 81a of the second partition wall constituting body 81 is folded by the engaging piece 85 and the portion where the upper end portion 80a of the first partition wall constituting body 80 is folded by the engaging piece 86 are caulked. . Thereby, the 1st engaging part 90a and the 2nd engaging part 90b are formed. Further, the first and second engaging portions 90a and 90b formed as described above are alternately arranged in the longitudinal direction of the air flow path member 35 as shown in FIG. And the front end side of the air flow path member 35 is closed.

  Further, the flanges 80c and 80d provided at both longitudinal ends of the first partition wall structure 80 are in surface contact with the flanges 81c and 81d provided on the second partition wall structure 81, respectively. Then, the hatched portions in FIG. 15A of the flanges 81c and 81d are bent toward the flanges 80c and 80d and caulked. As a result, the first and second partition members 80 and 81 are engaged at both longitudinal ends of the air flow path member 35.

  When the first and second partition members 80 and 81 are integrated as described above, as shown in FIG. 12 and FIG. A notch 89 for fire transfer is formed. The notch portion 89 for fire transfer is a notch 83 provided in the engagement pieces 85 and 86 (engagement pieces 85a and 86a) existing substantially at the center of the upper end portions 80a and 81a of the first and second partition members 80 and 81. , 84 are formed together, and serve to communicate the region facing the first partition member structure 80 divided by the air flow path member 35 and the region facing the second partition member structure 81. . In the present embodiment, as will be described in detail later, the air flow path member 35 is disposed between the combustion portions 34 and 34 of the burner units 30 and 30 disposed adjacent to each other in the combustion apparatus 10. Therefore, in the combustion apparatus 10, the notch portion for fire transfer 89 communicates the adjacent combustion portions 34, 34 with each other at the front end side of the air flow path member 35 and at the substantially central portion in the longitudinal direction of the air flow path member 35. It plays the role of assisting the transfer of fire between the combustion parts 34, 34.

  Further, as described above, the gaps s (see FIG. 17) formed in the bent portions of the engaging pieces 85 and 86 existing at positions adjacent to the fire transfer notch 89 are mostly formed by the protrusions 83 and 84. Is blocked.

  When the first and second partition structural members 80 and 81 are integrated as described above, a wall-shaped air flow path member 35 as shown in FIG. 12 is formed. Here, as described above, the first and second partition structural members 80 and 81 are bent at the valley fold portion L1 and the mountain fold portion L2, or have step portions 110 and 111, and the like. Therefore, when the first and second partition member 80, 81 are engaged and integrated by the upper end portions 80a, 81a, the flange portions 80c, 81c, and the flange portions 80d, 81d as described above, as shown in FIG. In addition, an air flow path 82 is formed inside the air flow path member 35.

  As shown in FIG. 13, the air flow path 82 is a space that extends from the base end (lower end) of the air flow path member 35 to the front end (upper end) and has a narrow front end. Is open downward. More specifically, as shown in FIG. 12 and FIG. 13, the air flow path member 35 is moved in the height direction from the distal end side to the proximal end side in the distal end region 130, the intermediate region 131, and the proximal end region 132. When classified into three regions, the distances W1 and W3 (channel cross-sectional areas) of the first and second partition wall structural members 80 and 81 in the distal end region 130 and the proximal end region 132 are both in the vertical direction, that is, the air channel in the illustrated state. The distance W1 between the distal end regions 130 is approximately 1/3 of the interval W3 between the proximal end regions 132.

  That is, the distal end region 130 is a portion corresponding to the region A on the upper end portions 80a and 81a side in the first and second partition members 80 and 81, and the proximal end region 132 is the region C on the lower end portions 80b and 81b side. It is a part corresponding to. As shown in FIG. 12 and FIG. 13 and the like, the first and second partition constituting members 80 and 81 bulge toward the outside of the air flow path member 35 at the valley fold portion L1 and the step portions 110 and 111. The channel cross-sectional area of the proximal end region 132 corresponding to the divided region C is smaller than that of the distal end region 130 corresponding to the region A. In the present embodiment, in the air flow channel 82, the interval W1 in the distal end region 130 is narrowed to about ３ of the interval W3 in the proximal end region 132.

  The intermediate region 131 is located between the above-described tip region 130 and the lower end region 132, and is a region formed by a portion corresponding to the region B in the first and second partition member 80, 81. The intermediate region 131 has a substantially tapered cross-sectional shape at the portion shown in FIG. 13A or the like, that is, at a position outside the position where the above-described protrusions 115 and 116 and the recesses 117 and 118 are provided. . That is, the intermediate region 131 has a tapered shape in which the cross-sectional shape is wide at the bottom (base end side) and the interval is narrowed toward the top (tip end side) in the portion shown in FIG. However, a bulging portion 135 is provided at the boundary portion between the tip end portion of the taper and the tip region 130. As for the outer wall part which comprises the bulging part 135, the front and back part is parallel.

  Further, as shown in FIG. 13B, in the intermediate region 131, the first and second partition constituting members 80 and 81 are substantially parallel at the positions where the above-described protrusions 115 and 116 are provided. And the air flow path 82 is narrowed in the position where the recessed parts 117 and 118 were provided. That is, in the intermediate region 131, the air flow path 82 is narrowed at the position where the recesses 117 and 118 are provided, and the air flow path is formed via the air introduction port 133 provided at the lower end of the air flow path member 35. The flow of air (outside air) introduced into 82 and the downward inclined surfaces 117b and 118b of the recesses 117 and 118 intersect with each other.

  In the air flow path member 35, the air flow path 82 is opened at the lower end portion of the proximal end region 132, and the open portion functions as an air inlet 133 for the air flow path 82 formed inside. The air flow path member 35 allows the air introduced into the air flow path 82 through the air introduction port 133 to pass through a large number of openings provided in the first and second partition wall structures 80 and 81. Separately, it can be supplied to three areas.

  More specifically, the air flow path member 35 has openings 97, 98 provided on the upper end portions 80a, 81a side of the first and second partition members 80, 81 on the front end side, long slits 92, 93, short The air flow path 82 communicates with the outside through the slits 95 and 96. The openings 97, 98, the long slits 92, 93, and the short slits 95, 96 are the combustion section 34 provided at a position adjacent to the air flow path member 35, and are on the front end side of the air flow path member 35. It functions as an air supply opening to a region (hereinafter referred to as a second combustion region 34b as required).

  In addition, the air flow path member 35 communicates with the outside through the openings 112 and 113 provided in the step portions 110 and 111 of the region B constituting the intermediate region 131. As shown in FIG. 4 and the like, the stepped portions 110 and 111 are combustion portions formed between the adjacent air flow path members 35 and 35 when the air flow path member 35 is assembled to the combustion device 10 or the burner unit 30. 34, it functions as an opening for supplying air to a region located on the flame hole member 33 side (hereinafter referred to as a first combustion region 34a as necessary).

  Further, the air flow path member 35 is connected to the air flow path 82 via the openings 119 and 120 provided in the recesses 117 and 118 in the vicinity of the boundary between the regions B and C of the first and second partition members 80 and 81. Is in communication with the outside. As shown in FIG. 4 and the like, the recesses 117 and 118 exist at positions facing the side surfaces of the intermediate member 36 when the air flow path member 35 is assembled to the combustion device 10 or the burner unit 30. The air flow path member 35 communicates with a gap 140 formed between the side surface of the intermediate member 36 and the air flow path member 35 through the openings 119 and 120.

  In addition, the air flow path member 35 is formed by assembling the first and second partition members 80 and 81 and combining the bulging portions 127a and 128a and the bulging portions 127b and 128b at both ends in the longitudinal direction. The air flow path 82 is communicated with the air discharge ports 145 and 146.

  Then, the structure of the combustion apparatus 10 and the burner unit 30 is demonstrated. The combustion device 10 and the burner unit 30 are configured by integrating the premixing member 32, the flame hole member 33, and the air flow path member 35 described above. As shown in FIGS. 3 and 4, the burner unit 30 has air flow path members 35, 35 arranged on both sides of an intermediate member 36 formed by integrating the premixing member 32 and the flame hole member 33. It has been configured.

  As shown in FIGS. 5 and 6, the intermediate member 36 is configured by inserting the premixing member 32 into the opening provided on the lower end side of the flame hole member 33 with the top portion 46 side as the head and integrating them. ing. As a result, the top 46 side of the premixing member 32 is inserted into the hollow portion formed in the flame hole member 33.

  Here, as shown in FIGS. 5 and 7, flange portions 42 are provided at both longitudinal ends of the premixing member 32. The flange portion 42 is cut out at a substantially central portion to form an engaging portion 42a. As shown in FIGS. 5 and 10, slits 52 extending from the lower end side of the flame hole member 33 to the middle portion in the height direction are provided at both ends in the longitudinal direction of the flame hole member 33. Therefore, when the premixing member 32 is inserted into the flame hole member 33, the flange portion 42 provided on the premixing member 32 fits into the slit 52 provided on the flame hole member 33. Then, when the premixing member 32 is inserted until the flange portion 42 comes into contact with the back end of the slit 52, the premixing member 32 and the flame hole member 33 are positioned in the insertion direction. When the premixing member 32 is inserted into the flame hole member 33 and integrated in this way, as shown in FIG. 4, the space 136 is located inside the flame hole member 33 and above the top 46 of the premixing member 32. (Premixed gas inflow space) is formed. The space 136 is formed in a portion corresponding to the throttle portion 62 and the downward bulging portion 66 of the flame hole member 33.

  As shown in FIG. 4, when the premixing member 32 is inserted into the flame hole member 33 to form the intermediate member 36, the vertical wall 49 constituting the lower step portion 38 b of the opening row portion 38 of the premixing member 32, 49 is in contact with the inner walls of the lower restrictors 63, 63 provided on the lower side of the flame hole member 33, and is positioned. In this state, of the opening row portion 38 of the premixing member 32, the upper step portion 38 a arrives at a position corresponding to the lower bulging portion 66 of the flame hole member 33. A gap 137 (air mixing flow path) is formed between the upper step portion 38 a and the downward bulging portion 66. The gap 137 communicates over substantially the entire length of the intermediate member 36 in the longitudinal direction. Further, the gap 137 communicates with the above-described space 136, that is, a region inside the throttle portion 62 and the downward bulging portion 66 of the flame hole member 33, and constitutes a flame hole upstream flow path 138.

  When attention is paid to the gap between the opening row portion 38 of the premixing member 32 and the flame hole member 33, the upper stage of the opening row portion 38 is formed in the lower bulging portion 66 of the side wall portions 31 and 32 of the flame hole member 33 as described above. There is a portion 38a. That is, in the state where the premixing member 32 and the flame hole member 33 are integrated to form the intermediate member 36, the openings 48 provided in a row in the opening row portion 38 of the premixing member 32 are located below the flame hole member 33. Arrives at a position corresponding to the bulging portion 66. Further, a gap 137 is formed between the upper step portion 38 a and the downward bulging portion 66. Therefore, in the intermediate member 36, the internal space of the premixing member 32 communicates with a gap 137 formed between the flame hole member 33 and the premixing member 32 through the opening 48.

  As shown in FIG. 4, most of the gap 137 is closed in the vicinity of the boundary portion between the throttle portion 63 and the downward bulging portion 66 of the flame hole member 33. That is, as described above, in the state where the premixing member 32 and the flame hole member 33 are integrated, the vertical wall 49 constituting the lower step portion 38b of the premixing member 32 constitutes the throttle portion 63 of the flame hole member 33. There is almost no gap between them.

  On the other hand, the gap 137 bulges on the base end side of the flame hole member 33 through a groove formed on the back side (air flow path 82 side) of the protrusion 64 provided in the throttle portion 63 of the flame hole member 33. It is in a state of communicating with the part. Further, there is a gap between the base end portion of the flame hole member 33 and the premixing member 32. Therefore, the above-described gap 137 communicates with the outside via a groove provided on the back side of the protrusion 64 and a gap formed on the base end side of the flame hole member 33, and through the communicating portion. Air can be taken in. That is, the gap formed on the base end side of the flame hole member 33 functions as an air inlet 143 for taking air into the gap 137.

  Here, paying attention to the positional relationship between the position of the protrusion 64 provided in the flame hole member 33 and the opening 48 provided in the opening row portion 38 of the premixing member 32, as shown in FIG. There is an opening 48 just above the strip 64. That is, the opening 48 is provided on the extension line of the position where the protrusion 64 is provided. Therefore, when a gas (premixed gas) is supplied from the inside of the premixing member 32 toward the gap 137 through the opening 48, the gas is supplied to the groove or the flame hole member 33 provided on the back side of the protrusion 64. It can be made to merge with the airflow taken in through the clearance gap formed in the base end part side.

  As shown in FIGS. 3 and 4, air flow path members 35, 35 are mounted on both sides of the intermediate member 36. The air flow path member 35 is fixed in a state of being positioned with respect to the intermediate member 36 by fitting the fitting concave grooves 72 and 72 of the flame hole member 33 to the air introduction port 133 on the proximal end side. Yes.

  More specifically, the air flow path member 35 is inserted until the base end side portion abuts on the bottom wall 72 a in the fitting groove 72. As a result, the base end portion of the air flow path member 35 is fitted into the fitting groove 72. That is, when the base end portion of the air flow path member 35 is inserted into the fitting concave groove 72, the base end portion of the air flow path member 35 is in surface contact with the outer wall portion of the base end portion of the flame hole member 33. At the same time, the inner surface of the lateral groove 123 provided on the proximal end side of the air flow path member 35 is in surface contact with the outer wall 72 b of the fitting groove 72. As a result, the air flow path member 35 is fixed to the intermediate member 36.

  When the air flow path member 35 is installed on both sides of the intermediate member 36 as described above, the air flow path member 35 has the protrusions 115 and 116 at the flame hole member 33 as shown in FIG. It will be in the state contacted partially. On the other hand, a gap 140 is formed between the air flow path member 35 and the flame hole member 33 at a portion excluding the contact portion, that is, at a position off the position where the protrusions 115 and 116 are provided.

  The gap 140 communicates with the combustion portion 34 formed above the top surface 55 of the flame hole member 33 in the posture shown in FIG. 4. On the other hand, the gap 140 is blocked by the bottom wall 72a of the fitting concave grooves 72, 72, and therefore does not communicate with the outside on the base end side. In addition, the air flow path 82 formed inside the air flow path member 35 communicates with the gap 140 via openings 119 and 120 provided in the intermediate region 131 of the air flow path member 35.

  Then, the assembly structure of the combustion apparatus 10 comprised using many above-mentioned burner units 30 is demonstrated. As shown in FIG. 2, in the combustion apparatus 10, a large number of air flow path members 35 and intermediate members 36 are alternately arranged on the case member 11, and the combustion apparatus 10 and the burner unit 30 are formed.

  More specifically, a support frame 170 for fixing the burner unit 30 is provided inside the case member 11 so as to face each other. As shown in FIG. 21, the support frame 170 includes an upper wall 171, a side wall 172, and a lower wall 173, and is formed by folding a single steel sheet twice. In the support frame 170, only the lower wall 173 is fixed to the case member 11, and the upper wall 171 and the side wall 172 are not fixed to the case member 11.

  Further, the inner surface of the case member 11 has a protruding portion 176 as shown in FIGS. In a state where the support frame 170 is fixed to the case member 11, a gap 177 having a predetermined width is formed between the side wall 172 and the protrusion 176 of the support frame 170.

  As shown in FIG. 21, a plurality of slits 175 are provided over the entire width of the upper wall 171 of the support frame 170 at regular intervals, and the slits 175 are similarly opposed in the opposite support frame 170. Is provided. The length d from the back end of the slit 175 to the back end of the opposing slit 175 is slightly shorter than the lengths of the air flow path member 35 and the intermediate member 36 in the longitudinal direction.

  The intermediate member 36 and the air flow path member 35 constituting the burner unit 30 are fitted into the slits 175 and 175 of the support frames 170 and 170 described above at both ends in the longitudinal direction. Here, as described above, the length d between the back ends of the opposing slits 175 and 175 is shorter than the length between both ends in the longitudinal direction of the intermediate member 36. However, only the lower wall 173 of the support frame 170 is fixed to the case member 11, and the upper wall 171 and the side wall 172 are not fixed. Further, the support frame 170 has a certain elasticity on the side wall 172. Therefore, when both ends of the air flow path member 35 and the intermediate member 36 are pushed into the opposing slits 175 and 175 from above, the support frame 170 is expanded between the side walls 172 and 172 by the air flow path member 35 and the intermediate member 36. To be spread.

  As described above, the air flow path member 35 is pushed in, and the upper wall 171 is engaged with the flange portions 80c, 80d of the first and second partition members 80, 81 and the engaging portions 147, 148 provided in the flange portions 81c, 81d. When it reaches, the support frame 170 returns to its original state due to its elasticity. At this time, the engaging portions 147 and 148 are engaged with the upper wall 171 of the support frame 170, and the air flow path member 35 is prevented from coming off. Further, when the intermediate member 36 is pushed in, the engaging portions 42 a provided at both ends in the longitudinal direction of the premixing member 32 constituting the intermediate member 36 are formed in the support frame 170 as in the case of the air flow path member 35 described above. Engage and the intermediate member 36 is prevented from coming off.

  When the air flow path member 35 and the intermediate member 36 are installed in the case member 11 as described above, the longitudinal direction of the burner unit 30 composed of the air flow path member 35 and the intermediate member 36 as shown in FIGS. A set plate 180 (partition member) is inserted between both ends in the direction, the side wall 172 of the support frame 170, and the wall surface 11 a of the case member 11.

  Here, the set plate 180 is a plate body having an external appearance as shown in FIG. 25D and a cross-sectional shape as shown in FIG. More specifically, the set plate 180 is formed by pressing a flat flat steel plate as shown in FIG. 25 (a) into a shape having irregularities as shown in FIG. 25 (b). As shown in FIG. 25 (c), it is folded to the surface 180a side to form a two-layer structure, and the end portions and the like are joined by spot welding.

  The set plate 180 has a main body wall 181 that extends in the vertical direction and a front wall 182 that is folded back to the surface 180a side of the steel plate at the lower end portion, with reference to the posture shown in FIG. The main body wall 181 has a step portion 183 at a substantially central portion in the vertical direction, and has a gap 186 between a lower portion (lower main body wall 185) and the front wall 182. The gap 186 is open upward. That is, the front wall 182 constituting the gap 186 has an opening 190 at a position above the gap 186, and the gap 186 is opened upward via the opening 190. The opening 190 functions as a first air ejection portion 195 (air discharge port).

  Further, a gap 188 is provided between a portion (upper main body wall 187) above the step portion 183 of the main body wall 181 and the upper end portion of the front wall 182. That is, the upper main body wall 187 has a protrusion 187 a that protrudes toward the surface 180 a of the steel plate that constitutes the set plate 180. The end portion (upper end portion in the illustrated state) of the front wall 182 is in contact with the protrusion 187a, and a gap 188 opened upward is formed between the upper main body wall 187 and the front wall 182. Yes. The open portion of the gap 188 functions as the second air ejection portion 196 (air discharge port).

  The gap 186 communicates with the back surface 180 b side of the steel plate constituting the set plate 180 through an opening 191 provided in the lower main body wall 185. Further, the gap 188 communicates with the back surface 180b side through an opening 192 provided in the upper main body wall 187.

  The set plate 180 has a piece-like biasing piece 189 (biasing means) that protrudes toward the back surface 180 b of the set plate 180 at an intermediate portion of the lower main body wall 185. The urging piece 189 has an elastic force in a direction approaching and separating from the main body wall 181 (lower main body wall 185), as indicated by an arrow in FIG. 24, the length from the surface 182a of the front wall 182 to the tip of the urging piece 189, that is, the thickness x at the position where the urging piece 189 is provided in the cross section shown in FIG. In FIG. 2, the gap X is slightly thinner than the gap X formed between the side wall 172 of the support frame 170 and the wall surface 11 a of the case member 11.

  In the state shown in FIG. 24, the set plate 180 has an upper end wall 198 bent at a position on the upper end side of the main body wall 181 substantially perpendicularly to the rear surface 180b side with respect to the main body wall 181.

  As shown in FIG. 22, the set plate 180 has a posture in which the front surface 180 a faces the burner unit 30 side from above the case member 11 and the back surface 180 b faces the wall surface 11 a side of the case member 11. And a gap 177 formed between the protruding portion 176 provided on the wall surface 11 a of the case member 11. Here, the interval of the gap 177 is substantially the same as the thickness of the lower end portion of the set plate 180, that is, the total thickness of the lower main body wall 185 and the front wall 182. Therefore, when the set plate 180 is inserted into the gap 177, the gap 177 formed between the side wall of the support frame 170 and the protruding portion 176 of the case member 11 is eliminated, and the set plate 180 is brought into close contact.

  22 and FIG. 23, when the set plate 180 is inserted, the urging piece 189 provided on the lower main body wall 185 comes into contact with the wall surface 11a of the case member 11. Here, as described above, the set plate 180 has a gap x between the side wall 172 of the support frame 170 and the wall surface 11a of the case member 11 having a thickness x at the position where the biasing piece 189 is provided. It is said to be slightly thinner than. Therefore, when the set plate 180 is inserted, the urging piece 189 is bent in a direction approaching the lower main body wall 185 of the set plate 180. In response to this reaction force, the set plate 180 is urged toward the air flow path member 35 and the intermediate member 36 and is pressed against the longitudinal ends of the air flow path member 35 and the intermediate member 36.

  When the set plate 180 is inserted, the upper end wall 198 provided on the upper end side comes into contact with the upper end portion of the case member 11. In this state, the upper end wall 198 is screwed to the upper end portion of the case member 11 and fixed to the case member 11. When the set plate 180 is attached in this way, as shown in FIG. 22, the upper main body wall 187 arrives at a position facing the air discharge port 145 of the air flow path member 35 installed in the case member 11. Further, the first air ejection portion 195 arrives slightly below the tip end portion of the air flow path member 35, that is, the region corresponding to the second combustion region 34b of the combustion portion 34, and the second air ejection portion 196 It reaches slightly above the hole member 33, that is, at a position corresponding to the first combustion region 34a.

  When the set plate 180 is attached to the case member 11 as described above, the bottom of the portion constituting the gap 186 of the set plate 180 is in close contact with the upper wall 171 of the support frame 170 as shown in FIG. Accordingly, as shown in FIG. 22, a cooling air flow path 199 that is connected to the bottom side of the case member 11 on the back surface 180 b side of the set plate 180 and into which the air introduced into the case member 11 can flow is formed.

  Then, the function of the hot water supply apparatus 1, the combustion apparatus 10, and the burner unit 30 is demonstrated. As shown in FIG. 2, in the hot water supply device 1, a large number of air flow path members 35 and intermediate members 36 are alternately arranged on the case member 11, and the combustion device 10 and the burner unit 30 are formed. As described above, each burner unit 30 shares the air flow path member 35 with the adjacent burner unit 30 in the state of being disposed in the case member 11. Therefore, the combustion apparatus 10 is configured such that the air flow path member 35 is disposed between the intermediate members 36 disposed in the case member 11.

  When the combustion apparatus 10 and the burner unit 30 are formed in the case member 11 as described above, the intermediate member 36 is placed between the adjacent air flow path members 35 and 35 as shown in FIG. The combustion part 34 is formed above the top surface 55 of the flame hole member 33 which comprises. As shown in FIG. 4, the combustion unit 34 is roughly divided into a first combustion region 34 a on the top surface 55 side and a second combustion region 34 b on the tip side of the air flow path member 35.

  The burner unit 30 is configured to realize so-called two-stage combustion. That is, the burner unit 30 combusts the premixed gas supplied from the flame hole member 33 to the combustion section 34 under the amount of air smaller than the theoretical amount of air in the first combustion region 34a, and the first combustion. In the combustion in the region 34a, the air is supplied to the second combustion region 34b and burned by supplying more air than the amount of air that is insufficient to completely burn the premixed gas. In the burner unit 30 of the present embodiment, air and fuel gas flow through various routes in order to realize two-stage combustion.

  More specifically, as shown in FIG. 1, the hot water supply device 1 has a blower unit 3 below the combustion device 10, and when the blower unit 3 is operated, air (outside air) from the bottom side of the case member 11. Is introduced into the case member 11. A part of the air introduced into the case member 11 passes through the cooling air flow path 199 formed between the wall surface 11a of the case member 11 and the set plate 180, as shown in FIG. It flows from the bottom side to the top side. Then, the air flows into the gaps 186 and 188 through the openings 191 and 192 provided in the set plate 180 as shown in FIG. 24, and the openings constituting the first air ejection portion 195 provided above these airs. 190 and the second air ejection part 196 are discharged along the set plate 180 from the gaps. The air discharged from the first and second air ejection portions 195 and 196 and the air flowing through the cooling air flow path 199 serve to prevent the set plate 180 and the case member 11 from becoming hot due to the combustion operation. .

  On the other hand, most of the air introduced into the case member 11 with the operation of the air blowing means 3 is supplied to the combustion device 10. Further, the fuel gas is supplied by the gas nozzle 8 provided at the position facing the case member 11, and supplied to the gas inlet 40 provided in the premixing member 32 of each burner unit 30.

  The air and fuel gas supplied to each burner unit 30 as described above flow as shown by arrows in FIGS. More specifically, the flow of air and fuel gas supplied to the burner unit 30 in accordance with the operation of the blower means 3 is roughly divided into three routes of first to third air flow routes P, Q, and R. The first air flow route P is further subdivided into three routes P1 to P3, and the second air flow route Q is subdivided into routes Q1 to Q3.

  That is, the first air flow route P is a route for supplying air to various parts of the burner unit 30 via the air flow path 82 formed in the air flow path member 35 as indicated by hatching or an arrow in FIG. is there. Further, the second air flow route Q is a route that mainly flows inside the intermediate member 36 as shown by hatching or an arrow in FIG. The third air flow route R is a route through which primary air and fuel gas flow, and is a route through which the gas flows from the gas inlet 40 of the premixing member 32 as indicated by arrows and hatching in FIG.

  As described above, the first airflow route P is roughly divided into routes P1 to P3. As shown by hatching or arrow P1 in FIG. 18, the route P1 passes through the air flow path member 35 and the openings 97, 98, long slits 92, 93, and short slits 95, 96 provided on the tip side. This is a flow path leading to the combustion unit 34. The route P1 is a route for mainly supplying the air introduced from the air inlet 133 of the air flow path member 35 to the second combustion region 34b of the combustion unit 34. That is, most of the air passing through the route P <b> 1 is supplied to the second combustion region of the combustion unit 34.

  Here, as shown in FIG. 4 and FIG. 18, in the burner unit 30 of the present embodiment, the air flow path member 35 has a substantially constant flow path cross-sectional area, but has an inclined surface 91, 94 and has a tapered shape. Therefore, in the burner unit 30, the air flowing through the air flow path member 35 stays at the tip portion or becomes in a turbulent state, and the air flow supplied to the combustion unit 34 through the air flow route P <b> 1. There is a possibility that the flame becomes unstable or the flame formed in the second combustion region 34b (hereinafter referred to as a secondary flame as necessary) fluctuates. Further, as described above, when the air flow or the secondary flame becomes unstable, there is a possibility that the noise generated with the combustion operation becomes high.

  However, in the air flow path member 35 employed in the burner unit 30 of this embodiment, the long slits 92 and 93 and the short slits 95 and 96 are provided over almost the entire area of the inclined surfaces 91 and 94. Therefore, in the burner unit 30, it is difficult for the air flowing in the air flow path member 35 to stay in the tip portion as described above or to be in a turbulent state. Therefore, in the burner unit 30, the air flow supplied to the combustion unit 34 via the route P1 and the secondary flame formed in the second combustion region 34b are stable, and the noise generated with the combustion operation is small.

  A part of the air passing through the route P <b> 1 is discharged to the outside of the air flow path member 35 through the air discharge ports 145 and 146 provided at both longitudinal ends of the air flow path member 35. Here, as shown in FIG. 22, the air discharge ports 145 and 146 provided at both ends in the longitudinal direction of the air flow path member 35 are formed on the set plate 180 inserted between the case member 11 and the burner unit 30. Opposite the upper body wall 187. Therefore, a part of the air passing through the route P1 is blown to the upper main body wall 187 of the set plate 180 through the air discharge ports 145 and 146 to prevent the set plate 180 and the case member 11 from being excessively heated. Used for.

  As shown by hatching or arrow P2 in FIG. 18, the route P2 flows through the air flow path 82, and the openings 112 and 113 provided in the inclined surfaces 110 and 111 at the upper end portion of the intermediate region 131 of the air flow path member 35. Through the first combustion region 34a of the combustion section 34. The air ejected from the openings 112 and 113 flows obliquely upward with respect to the axis of the burner unit 30 in the state shown in FIG.

  As shown by hatching and arrow P3 in FIGS. 18A and 18B, the route P3 passes through the air flow path 82 and is located in the middle of the air flow path 82, that is, the lower end of the intermediate region 131 of the air flow path member 35. A gap 140 formed between the air flow path member 35 and the intermediate member 36 (flame hole member 33) from the openings 119, 120 provided in the lower inclined surfaces 117b, 118b of the recesses 117, 118 on the side. This is the route. That is, in the route P3, the air flow flowing into the air flow path 82 hits the lower inclined surfaces 117b and 118b of the recesses 117 and 118, and a part of this air is provided outside the air flow path 82 from the openings 119 and 120. It is a route that flows out into the gap 140 formed. Here, as described above, the gap 140 communicates with the combustion unit 34 between the decompression wall 51 of the flame hole member 33 and the air flow path member 35. Therefore, the air flowing through the route P3 finally reaches the combustion unit 34 through the gap 140.

  Subsequently, the second air flow route Q will be described. The second airflow route Q is roughly divided into routes Q1 to Q3. As shown by hatching or arrow Q1 in FIG. 19, the route Q1 is inside the intermediate member 36, that is, the gap 137 via an air inlet 143 formed on the base end side of the flame hole member 33 constituting the intermediate member 36. To the space 136 formed inside the flame hole member 33 and above the top 46 of the premixing member 32, and through the flame hole 60 formed in the top 46 to the first combustion region 34 a of the combustion part 34. A route to reach. The route Q2 extends from the air inlet 143 through the gap 137 to the space 136, and is formed between the main body member 50 and the decompression wall 51 from the opening 67 provided in the main body member 50 of the flame hole member 33 forming the space 136. This is a route that reaches the combustion section 34 through the formed gap 75.

  In the route Q3, the air introduced from the air introduction port 143 is outside the intermediate member 36 via the communication holes 73, 73 provided in the inclined surfaces 71, 71 on the proximal end side of the flame hole member 33. It is a route that flows out. The air that flows out through the route Q3 flows into the gap 140 formed between the flame hole member 33 and the air flow path member 35. And this air is discharge | released to the combustion part 34 side with the air which flowed in the clearance gap 140 via the above-mentioned route P3.

  Here, in the cross section at the site shown in FIG. 19, in the routes Q1 and Q2, the premixing member 32 and the flame hole member 33 are in surface contact at the position of the throttle part 63 of the flame hole member 33, and the vertical direction Not communicating with However, as described above, the flame hole member 33 includes a plurality of protrusions 64 and 64 in which the base end side portion and the lower bulging portion 66 thereabove are provided at positions corresponding to the throttle portion 63. It communicates in the up-and-down direction through a groove formed on the back side. Therefore, the air supplied through the routes Q1 and Q2 is introduced from the air introduction port 143 on the proximal end side of the flame hole member 33, and then as shown by a two-dot chain line in FIG. , 64 through the groove on the back side to reach the gap 137.

  Next, the third air flow route R will be described. The third air flow route R is a route in which primary air and fuel gas flow inside the premixing member 32 and merge with the route Q described above in a gap 137 formed outside the premixing member 32. More specifically, the third air flow route R starts from the gas introduction port 40 of the premixing member 32 and is provided in the opening row portion 38 through the mixing flow path 37 and the opening row portion 38 of the premixing member 32. This is a route from many openings 48 to the gap 137. The primary air and fuel gas flowing through the third air flow route R are mixed while passing through the mixing flow path 37 and the like to become a premixed gas.

  Then, in this embodiment, the operation | movement in case the burner unit 30 which comprises the combustion apparatus 10 performs a combustion action is demonstrated. When the burner unit 30 performs a combustion operation in the combustion device 10, the blower unit 3 is activated, and outside air (air) is introduced into the case member 11 of the combustion device 10. In parallel with this, the fuel gas is introduced into the case member 11 from the gas nozzle 8.

  The air and fuel gas introduced into the case member 11 are supplied to various parts of the burner unit 3 through the first to third air flow routes P, Q, and R described above. That is, a part of the air introduced into the case member 11 flows into the air flow path 82 from the air introduction port 133 provided at the base end portion of the air flow path member 35. Then, a part of the air flowing into the air flow path 82 passes through the route P1 of the first air flow route P described above to the second combustion region 34b of the combustion unit 34, as indicated by an arrow P1 in FIG. Supplied. Further, a part of the air flowing into the air flow path 82 passes through the route P2 to the inclined surfaces 110 and 111 of the air flow path 35 located on the base side of the combustion section 34 as indicated by an arrow P2 in FIG. It is supplied to the first combustion region 34a from the provided openings 112 and 113. Further, the remaining portion of the air flowing into the air flow path 82 is supplied to a position adjacent to the side flame holes 76 and 76 provided in the flame hole member 33 via the route P3 as indicated by an arrow P3 in FIG. .

  A part of the air introduced into the case member 11 flows through the air flow route Q described above. A part of the air flowing through the air flow route Q is burned from the flame hole 60 or the side flame hole 76 of the flame hole member 33 through the space 136 formed inside the flame hole member 33 as in the routes Q1 and Q2 described above. Released to the part 34 side. On the other hand, the remaining portion of the air flowing through the air flow route Q flows into the gap 140 outside the intermediate member 36 through the communication holes 73 and 73 provided in the inclined surfaces 71 and 71 of the flame hole member 33, and through this. It is discharged to the combustion part 34 side at the side of the side flame hole 76.

  The remaining air and the fuel gas introduced into the case member 11 are premixed via the third air flow route R formed by the premixing member 32 to become a premixed gas. The premixed gas passes through the opening 48 provided in the opening row portion 38 of the premixing member 32, and the gap 137 formed between the premixing member 32 and the flame hole member 33, that is, the second airflow. Supplied to the path Q.

  The premixed gas supplied to the gap 137 flows in from the air introduction port 143 provided on the base end side of the flame hole member 33 and merges with the airflow flowing through the second airflow route Q. Thereafter, the premixed gas combined with the airflow flows into the space 136 formed above the premixing member 32 and spreads over the entire space 136. As a result, the premixed gas formed in the third airflow route R is further mixed with the air flowing through the second airflow route Q. A part of the premixed gas existing in the space 136 is discharged toward the combustion unit 34 from the flame hole 60 provided in the top surface 55 of the flame hole member 33 as shown by the route Q1 described above. . On the other hand, the remaining portion of the premixed gas existing in the space 136 flows out from the opening 67 provided in the main body member 50 constituting the flame hole member 33 into the gap 75 formed between the main body member 50 and the decompression wall 51. The gas is discharged from the side flame hole 76 toward the combustion unit 34.

  More specifically, air (primary air) or fuel gas introduced into the case member 11 is introduced from the gas introduction port 40 of the premixing member 32 and flows through the mixing flow path 37. Here, as shown in FIGS. 5 and 7, etc., there are a throttle portion 41, an enlarged diameter portion 43, etc. in the middle of the mixing flow path 37, and the flow path cross-sectional area advances in the flow direction of air or fuel gas. It is supposed to change. Therefore, air and fuel gas are gradually mixed while flowing through the mixing flow path 37, and eventually become premixed gas. Then, the premixed gas flows into the opening row portion 38 provided above the mixing channel 37. Here, in the example shown in the present embodiment, the mixing channel 37 does not have a portion that becomes a constriction between the uniform cross section 45 and the opening row portion 38, that is, a portion having a small channel cross-sectional area. Therefore, the premixed gas flowing through the mixing flow path 37 enters the opening row portion 38 at a substantially uniform flow rate and spreads substantially uniformly in the opening row portion 38 regardless of the flow site.

  The premixed gas that has entered the opening row portion 38 is discharged from each opening 48 substantially uniformly toward the outside of the premixing member 32. That is, the opening row portion 38 has a considerable internal volume. Therefore, even if a minute vortex is generated in the flow of the premixed gas when passing through the curved path of the premixing member 32, the vortex is generated when air or fuel gas flows into the opening row portion 38. Converged at. Further, since there is no portion to be throttled immediately before the opening row portion 38, variation in the flow velocity of the premixed gas introduced into the opening row portion 38 is small. Therefore, the premixed gas that has flowed into the opening row portion 38 has little pressure variation. Accordingly, the premixed gas is evenly discharged from each opening 48. The fuel gas discharged from each opening 48 enters the gap 137 formed by the lower bulging portion 66 of the flame hole member 33 and is mixed with the air flowing through the second gas route Q described above.

  On the other hand, the air flowing through the second gas route Q, that is, the gap 137 flows upward from the lower side of the drawing and is rectified. That is, the air flowing into the gap 137 and flowing through the second gas route Q is introduced from the air inlet 143 provided on the proximal end side of the flame hole member 33 as shown in FIG. The air passes through a concave groove formed on the back side of the protrusion 64 provided in the throttle portion 63 of the flame hole member 33 and linearly extending in the vertical direction. Therefore, the air taken in from the air inlet 143 side is rectified into the gap 137 and supplied in a laminar flow state from the lower side (base end side) to the upper side (tip end side).

  Here, as shown in FIG. 19, air flows in the vertical direction in the gap 137 constituting the second gas route Q, whereas the air flows through the opening 48 of the opening row portion 38 provided in the premixing member 32. The premixed gas that merges from the third gas route R to the second gas route Q crosses the air flow in the gap 137 of the second gas route Q (in the present embodiment, the direction that is substantially orthogonal). Flowing. Therefore, the premixed gas released from the opening 48 of the opening row portion 38 collides violently when joining the air flowing through the gap 137, and the premixed gas and the air flowing through the gap 137 are sufficiently mixed.

  Furthermore, in this embodiment, in a state where the premixing member 32 and the flame hole member 33 are integrated to form the intermediate member 36, an opening row is formed on the extension line of the protrusion 64 provided on the side of the flame hole member 33. The opening 48 of the part 38 is configured to arrive. Therefore, the air flow passing through the concave groove formed on the back side of the protrusion 64 surely intersects and collides with the flow of the premixed gas discharged from the opening 48 of the flame hole member 33, and the premixed gas and air Stream mixing is further promoted. Further, since the gap 137 communicates over the entire region in the longitudinal direction of the opening row portion 38, the pressure of the mixture of premixed gas and air (hereinafter collectively referred to as premixed gas) is also smoothed.

  The premixed gas flowing through the gap 137 flows further downstream, that is, upward in the illustrated state, and flows into a space 136 formed above the premixing member 32. When the premixed gas flows into the space 136, mixing is promoted. Most of the premixed gas flowing into the space 136 is discharged from the slits forming the flame holes 60 to the first combustion region 34a of the combustion unit 34 at a substantially uniform flow rate regardless of the part. On the other hand, the remaining portion of the air that has entered the space 136 is discharged from the opening 67 provided on the side of the main body member 50, enters the gap 75 between the main body member 50 and the decompression wall 51, and is opened upward. 76 is discharged into the first combustion region 34 a of the combustion section 34.

  When the premixed gas is released from the flame hole 60 or the side flame hole 76 as described above, the premixed gas is ignited. When the premixed gas discharged from the flame hole 60 is ignited, as shown in FIGS. 4 and 18 to 20, primary combustion is performed in the first combustion region 34 a of the combustion unit 34 to form a primary flame.

  Here, the premixed gas used for primary combustion is the amount of air required for complete combustion of the fuel gas contained in the premixed gas (hereinafter referred to as the theoretical air amount). ) In addition, air discharged from the openings 112 and 113 provided in the inclined surfaces 110 and 111 of the air flow path member 35 is supplementarily supplied to the primary flame side during the primary combustion, but the supply amount of the air is taken into consideration. Even so, the amount of air supplied for primary combustion does not reach the theoretical amount of air. Therefore, in the primary combustion in the first combustion region 34a, part of the fuel gas contained in the premixed gas is burned, and the remaining part is present in the unburned state downstream, that is, on the tip side of the burner unit 30. It flows toward the second combustion region 34b side.

  On the other hand, the primary flame formed by the primary combustion is held by the flame formed by the combustion of the premixed gas discharged from the side flame holes 76 and 76 provided on both sides of the flame hole 60. The premixed gas released from the side flame holes 76, 76 is completely burned in the presence of air supplied through the gap 140 opened toward the base end portion of the first combustion region 34 a of the combustion portion 34. A flame that is sufficiently smaller than the primary flame is formed at the base end of the primary flame.

  That is, in the present embodiment, a part of the premixed gas is released from the side flame holes 76 to the first combustion region 34 a, and the flow rate of the premixed gas is that of the premixed gas released from the flame holes 60. Slow enough compared to the flow rate. More specifically, the premixed gas discharged from the side flame hole 76 is formed by a gap formed between the main body member 50 and the decompression wall 51 from the opening 67 provided in the main body member 50 of the flame hole member 33. 75. Here, as shown in FIG. 11 and the like, the gap 75 is slit-shaped and very narrow, so the amount of the premixed gas that enters the gap 75 and is released from the side flame holes 76 is very small. Further, the side flame hole 76 extends in the longitudinal direction of the flame hole member 33. Therefore, the premixed gas discharged from the side flame holes 76 is sufficiently slower than the flow velocity of the premixed gas discharged from the flame holes 60. In addition, a sufficient amount of air to completely burn the premixed gas in the side flame hole 76 is released from the gap 140 to the side of the side flame hole 76. Therefore, a stable flame holding is formed in the side flame hole 76 in combination with the low flow rate of the premixed gas. Further, by this flame holding, the base end portion of the primary flame formed in the flame hole 60 is held, and the primary flame is stabilized.

  When primary combustion is performed in the first combustion region 34a of the combustion section 34, a part of the fuel gas remains in an unburned state without being burned in the combustion gas generated by the primary combustion. Combustion gas containing unburned fuel gas (hereinafter referred to as unburned residual gas as necessary) is a second gas located downstream of the burner unit 30, that is, on the upper end side (tip side) in the illustrated state. It flows to the combustion region 34b. The unburned residual gas that has flowed into the second combustion region 34b passes through the route P1 of the first gas route P described above, and the openings 97, 98 provided on the front end side of the air flow path member 35, the long slits 92, 93, secondary combustion is formed in the presence of air discharged from the short slits 95, 96 to form a secondary flame, and the unburned fuel gas contained in the unburned residual gas is completely burned. .

  Subsequently, operations of the hot water supply device 1, the combustion device 10, and the burner unit 30 of the present embodiment will be described. The hot water supply apparatus 1 burns fuel gas in each burner unit 30 constituting the combustion apparatus 10 based on a usage request from a user, and supplies the heat exchange means 5 with heat exchange with the high-temperature combustion gas generated thereby. Heat the hot and cold water.

  More specifically, the combustion apparatus 10 according to the present embodiment can perform a combustion operation on all or a part of the many burner units 30 arranged in the case member 11. When the combustion device 10 performs the combustion operation, the blower 3 is first activated, and the outside air is supplied to the burner unit 30 that performs the combustion operation. In parallel with this, fuel gas is supplied from the gas nozzle 8 to the burner unit 30 that performs the combustion operation. The air and fuel gas supplied to each burner unit 30 are distributed throughout the burner unit 30 in the same manner as described above. The fuel gas supplied to each burner unit 30 is premixed with air to become a premixed gas, and enters the combustion unit 34 from the flame hole 60 of the flame hole member 33 or the side flame holes 76 provided on both sides thereof. Released. In addition, the air supplied to each burner unit 30 includes a gap 140 provided beside the side flame hole 76, openings 97, 98, 112, 113 provided in the air flow path member 35, and long slits 92, 93. The gas is discharged from the short slits 95 and 96 to the combustion unit 34 side.

  As described above, when the premixed gas or air is distributed to each burner unit 30 to be used for combustion, the ignition device 12 (see FIGS. 1 and 2) provided above the burner unit 30 in the combustion device 10 performs the preheating. The mixed gas is ignited. As shown in FIG. 2, the ignition device 12 is positioned above the combustion section 34 included in one of the burner units 30 arranged side by side (the burner unit 30 a in FIG. 2). Therefore, when the ignition operation by the ignition device 12 is performed, first, the premixed gas starts to burn in the combustion section 34 of the burner unit 30a.

  When the premixed gas starts to burn in the burner unit 30a, as shown in FIG. 4 and the like, a primary flame is formed in the first combustion region 34a of the combustion section 34 of the burner unit 30a, and the side flames provided on both sides thereof. A small flame (flame holding) is formed in the hole 76. Further, in the second combustion region 34b provided on the downstream side in the flow direction of the premixed gas discharged from the flame hole 60 with respect to the first combustion region 34a, that is, on the tip side of the burner unit 30a, the first combustion region 34a In combustion (primary combustion), the fuel gas remaining in an unburned state burns (secondary combustion), and a secondary flame is formed. When the primary flame, the flame holding, and the secondary flame are formed in the burner unit 30a in this way, a fire transfer occurs from the burner unit 30a toward the burner unit 30 adjacent thereto.

  Here, the burner unit 30 employed in the hot water supply apparatus 1 and the combustion apparatus 10 of the present embodiment is provided at the front end side of each air flow path member 35, and has a notch 89 for fire transfer at a substantially central part in the longitudinal direction. And the combustion parts 34 of the burner units 30 and 30 adjacent to each other, more specifically, the second combustion regions 34b communicate with each other. Therefore, when a secondary flame is formed in the burner unit 30, the burner unit 30 adjacent to the burner unit 30 via the flame transfer cutout portions 89 and 89 of the air flow path members 35 and 35 constituting the burner unit 30, The fires are transferred smoothly and smoothly toward the 30 combustion parts 34, 34, and flames (primary flame, secondary flame, flame holding) are formed in all the combustion parts 34 of the burner unit 30 used for combustion.

  Further, as shown in FIG. 12 and the like, the air flow path member 35 is provided with openings 97 and 98, long slits 92 and 93, and short slits 95 and 96 in order to supply air to the combustion section 34 on the tip side. Although they are configured, they are provided at positions outside the extension of the region where the fire transfer notch 89 is provided. Further, in the air flow path member 35, as shown in FIG. 17, the gap s (see FIG. 17) formed in the bent portions of the engagement pieces 85 and 86 existing at the position adjacent to the notch 89 for fire transfer. Most of the protrusions 83a and 84a are closed, and almost no air flows into the notch 89 for fire transfer from the gap s. Therefore, in the combustion apparatus 10 of the present embodiment, there is a low possibility that the fire transfer in the fire transfer notch 89 is hindered by the air released from the openings 97, 98 and the like.

  Here, as described above, the combustion apparatus 10 includes a large number of burner units 30 in the case member 11, and the combustion operation can be performed in all or part of the combustion operation. It is. In the hot water supply apparatus 1 of the present embodiment, the combustion amount required for the combustion apparatus 10 based on the amount of thermal energy required to heat the hot water with the heat exchange means 5 according to the amount of hot water to be supplied and the set temperature (hereinafter referred to as the amount of combustion) (Referred to as a required combustion amount if necessary), and the number of burner units 30 that perform the combustion operation in the combustion apparatus 10 is changed in accordance with the required combustion amount.

  More specifically, the combustion apparatus 10 has a large number of burner units 30 arranged side by side in the case member 11 as described above. However, all the burner units 30 are operated by combustion depending on the required combustion amount. Only a part of the burner units 30 may be burned. More specifically, when the required combustion amount for the combustion device 10 is equal to or greater than a predetermined amount (hereinafter referred to as a large combustion amount as necessary), all the burner units 30 constituting the combustion device 10 are operated for combustion. .

  On the other hand, when the required combustion amount for the combustion apparatus 10 is less than a predetermined amount (hereinafter referred to as a small combustion amount as necessary), some of the many burner units 30 disposed in the case member 11 are burned. Operates but the remainder does not burn. In the present embodiment, of the burner unit 30 constituting the combustion apparatus 10, the case member 11 is separated from an air flow path member 35 (hereinafter referred to as an air flow path member 35 a as necessary) provided at a predetermined position. The burner unit 30 disposed on one side performs the combustion operation, but the burner unit 30 disposed on the other side does not perform the combustion operation.

  More specifically, when the air flow path member 35 arranged on the left side with respect to the third intermediate member 36 from the right in the state shown in FIG. 3 corresponds to the air flow path member 35a at the boundary position described above. Each burner unit 30 provided on the left side of the air flow path member 35a performs the combustion operation regardless of the required combustion amount, but the burner unit 30 existing on the right side of the air flow path member 35a is required. The combustion operation is not performed when the combustion amount is a small combustion amount. Therefore, in the state shown in FIG. 3, when the required combustion amount is a small combustion amount, the left surface of the air flow path member 35 a, that is, the second partition member structure 81 becomes high temperature, but the first partition member structure 80. Does not reach a high temperature, and the temperature difference between the first and second partition members 80 and 81 increases.

  That is, in the state shown in FIG. 2, the air flow path member 35a forms a flame in the combustion section 34 facing the left side (second partition wall component member 81 side), but the right side (first partition wall component member 80 side). A flame is not formed in the combustion part 34 facing the surface. Therefore, in the air flow path member 35a, the second partition wall constituting member 81 is heated by the flame and becomes high temperature, whereas the first partition wall constituting member 80 is not heated. Therefore, when the required combustion amount is a small combustion amount, a large temperature difference is formed between the first and second partition member 80 and 81, and the second partition member 81 side expands more than the first partition member 80. Or stretch. Accordingly, if the first and second partition wall constituting members 80 and 81 constituting the air flow path member 35a are firmly fixed by welding or the like, a large thermal stress acts on the fixed portion or the like. There is a possibility that problems such as cracks occur in the fixed portion and the first and second partition wall constituting members 80 and 81.

  However, in the burner unit 30 of the present embodiment, considering that the above-described thermal stress acts when the required combustion amount for the combustion apparatus 10 is a small combustion amount, Rather than fixing 81 by welding or the like, the first and second partition wall constituting members 80 and 81 are bent and engaged with each other at the front end portion and both longitudinal end portions of the air flow path member 35 and integrated by caulking. As a result, the occurrence of defects due to thermal stress as described above is prevented.

  More specifically, the engagement pieces 85 and 86 provided at the upper end portions 80a and 81a of the first and second partition member 80 and 81 are bent so that the first and second engagement portions 90a and 90b are the air flow path member 35. The engaging portions 90 alternately arranged in the longitudinal direction are formed, the first and second partition wall constituting members 80 and 81 are engaged on the upper end portions 80a and 81a side, and the engaging portions 90 are caulked and fixed. Yes. Further, by bending the flanges 81c and 81d at both ends in the longitudinal direction of the second partition member 81 to the first partition member 80 side, the first and second partition members 80 and 81 are engaged at both ends in the longitudinal direction. In addition, the engaging portion is caulked and fixed. Therefore, the first and second partition wall constituting members 80 and 81 are integrated in the engaging portion 90 and the like, but a restraining force (fixing force) acting between the first and second partition wall constituting members 80 and 81 at the portion. Is smaller than when fixed by welding or the like. Therefore, even if only one of the first and second partition constituting members 80 and 81 becomes high temperature and causes some expansion or deformation as compared with the other, the expansion or deformation is alleviated or offset by the engaging portion 90 or the like. Unreasonable stress does not act on the first and second partition members 80 and 81.

  Further, the air flow path member 35 employed in the present embodiment is provided with lateral grooves 100 and 101 in the longitudinal direction of the air flow path member 35 in the region A of the first and second partition wall constituting members 80 and 81. In addition, the rigidity of the first and second partition structural members 80 and 81 is enhanced. Furthermore, although the horizontal concave grooves 100 and 101 are configured by the horizontal concave grooves 100a to 100e and 101a to 101e, the lengths L1 to L5 of the horizontal concave grooves 100a to 101e are the air flow during the combustion operation of the combustion device 10 and the burner unit 30, respectively. The vicinity of the central portion in the longitudinal direction of the road member 35 is adjusted in consideration that the temperature is higher than that in the vicinity of both ends in the longitudinal direction. That is, the length L1 to L3 of the lateral concave grooves 100a to 100c and the lateral concave grooves 101a to 101c that arrive at a position corresponding to the central portion of the air flow path member 35 and the vicinity thereof are the longitudinal direction of the air flow path member 35. It is configured to be shorter than the lengths L4 and L5 of the lateral concave grooves 100d and 100e and the lateral concave grooves 101d and 101e located on both ends. Therefore, even if the air flow path member 35 has a higher temperature in the vicinity of the central portion in the longitudinal direction than the both end portions due to the combustion operation, an unreasonable stress does not act locally.

  The air flow path member 35 shown in the above embodiment has a configuration in which the horizontal concave grooves 100 and 101 are provided in each of the first and second partition wall structural members 80 and 81, but the present invention is not limited thereto. As shown in FIG. 26 (a), a structure corresponding to the horizontal concave grooves 100 and 101 may be arranged in a plurality of rows vertically (two rows in the example of FIG. 26 (a)). . With such a configuration, it is possible to further improve the rigidity of the first and second partition wall constituting members 80 and 81 and the air flow path member 35 formed using the same.

  Moreover, in the said embodiment, the structure which provided the horizontal concave groove 100a-100e and the horizontal concave groove 101a-101e from which length differs for every site | part considering the balance of the stress which acts on the air flow path member 35 at the time of combustion operation | movement. However, the present invention is not limited to this. That is, as shown in FIG. 26 (b), it is possible to provide a configuration in which lateral concave grooves 100, 101 extending in the longitudinal direction of the air flow path member 35 are provided.

  In the case of such a configuration, although the above-described stress balance is not taken into consideration, the rigidity of the air flow path member 35 is increased, and the creation of the air flow path member 35 is facilitated. Therefore, the balance of the stress acting on the air flow path member 35 in accordance with the combustion operation hardly changes in the longitudinal direction of the air flow path member 35, or the configuration as shown in FIG. When sufficient rigidity is obtained to the extent that it is not necessary to take into account the balance of stress, it is desirable to take the configuration as shown in FIG. In the case of forming the horizontal concave grooves 100 and 101 as shown in FIG. 26B, the horizontal concave grooves 100 and 101 are provided in a plurality of rows as in the example shown in FIG. May be.

  Further, as described above, the air flow path member 35 has a part or all of a convex shape, that is, a horizontal concave shape instead of providing a concave shape like the horizontal concave grooves 100a to 100e and the horizontal concave grooves 101a to 101e. It is also possible to provide a groove protruding in the opposite direction to the grooves 100a to 100e and the laterally concave grooves 101a to 101e.

  Further, the air flow path member 35 has a configuration in which irregularities such as a circular shape in a plan view are arranged in a row instead of being long and thin like the horizontal concave grooves 100a to 100e and the horizontal concave grooves 101a to 101e. Or it is good also as a structure which provided both these unevenness | corrugations and concave or convex things like the above-mentioned horizontal concave groove 100a-100e and horizontal concave groove 101a-101e.

  The air flow path member 35 used in the present embodiment has recesses 117 and 118, and the air flow path 82 in which the lower inclined surfaces 117 b and 118 b constituting the recesses 117 and 118 are provided inside the air flow path member 35. It inclines so that it may intersect with the streamline of the airflow that flows through In addition, openings 119 and 120 are provided in lower inclined surfaces 117b and 118b constituting the recesses 117 and 118, respectively. Therefore, the burner unit 30 has a substantially uniform amount of air in the gap 140 formed outside the air flow path member 35 via the openings 119 and 120 regardless of conditions such as the temperature of the air flowing through the air flow path 82. It can be discharged and supplied to the first combustion region 34 a of the combustion section 34.

  More specifically, since the air flow path member 35 is provided with the lower inclined surfaces 117b and 118b, the air flowing through the air flow path 82 just after the combustion operation is started in the combustion section 34 (initial stage of combustion). Even when the temperature of the air flow is low, the temperature of the air flowing through the air flow path 82 becomes high to some extent as when the combustion has started for a while, and even if the air is expanding, A part of the air passing through the path 82 always strikes the lower inclined surfaces 117b and 118b. Therefore, the air passing through the air flow path 82 has a lower inclined surface 117b regardless of conditions such as the temperature level, that is, the length of time elapsed after the start of the combustion operation or the temperature level of the air supplied from the outside. , 118b through the openings 119, 120 to flow into the gap 140 by a substantially constant amount.

  As described above, in the burner unit 30 employed in the combustion apparatus 10 in the present embodiment, the amount of air supplied to the combustion unit 34 via the gap 140 is stable. Therefore, the combustion device 10 and the burner unit 30 are always in a stable combustion state, and problems such as vibration combustion due to insufficient air supply amount do not occur.

  Further, in the burner unit 30 of the present embodiment, the communication holes 73 and 73 are provided in the inclined surfaces 71 and 71 on the base end side of the flame hole member 33, and premixing is performed at the base end portion of the flame hole member 33. Part of the air introduced through the air inlet 143 formed between the member 32 can be discharged into the gap 140 and supplied to the combustion unit 34. That is, the burner unit 30 has a route Q3 for supplying air to the gap 140 as indicated by an arrow Q3 in FIG. Therefore, the burner unit 30 of this embodiment can supply the air supplied through the route Q3 for the combustion operation in the combustion unit 34.

  In the above embodiment, the recesses 117 and 118 are provided, the openings 119 and 120 are provided in the downward inclined surfaces 117b and 118b, and the communication holes 73 and 73 are provided in the flame hole member 33. The present invention is not limited to this, and may have a configuration in which any of the openings 119 and 120 or the communication holes 73 and 73 is omitted.

  As described above, the burner unit 30 employed in the combustion apparatus 10 of the present embodiment has the air discharge ports 145 and 146 at both ends in the longitudinal direction of the air flow path member 35, and the air flow path is interposed therethrough. A part of the air flowing through 82 can be sprayed to the set plate 180 disposed along the case member 11. Therefore, in the combustion apparatus 10, even if the combustion operation is performed in the combustion part 34 of each burner unit 30, there is a low possibility that the set plate 180 defining the combustion part 34 becomes too hot.

  Furthermore, in the combustion apparatus 10 of the present embodiment, a set plate 180 is disposed between the burner unit 30 and the case member 11, and a cooling air flow path 199 through which air can flow between the set plate 180 and the case member 11. Is formed. Further, the combustion device 10 is configured to be able to supply a part of the air introduced into the case member 11 with the operation of the air blowing means 3 to the cooling air flow path 199. Further, the combustion apparatus 10 ejects the air introduced into the gaps 186 and 188 through the openings 191 and 192 provided in the main body wall 181 of the set plate 180 through the first and second air ejection portions 195 and 196. , And can flow along the surface 180 a of the set plate 180. Therefore, even if the combustion operation is performed in the combustion section 34 of each burner unit 30, the combustion apparatus 10 causes the set plate 180 and the case member 11 to be excessively heated by the air flow as described above, and deteriorates over time. Can be prevented.

  Further, in the combustion apparatus 10 of the present embodiment, the set plate 180 is urged toward the burner unit 30 by the urging force generated in the urging piece 189. Therefore, in the combustion apparatus 10, the air flowing through the cooling air flow path 199 does not leak to the burner unit 30 side.

  In the combustion apparatus 10 described above, the protruding portion 176 that protrudes inward is provided on the wall surface 11 a of the case member 11. Therefore, the combustion apparatus 10 can maintain the interval of the cooling air flow path 199 formed between the wall surface 11 and the set plate 180 at a certain interval or more.

  As described above, the combustion apparatus 10 of the present embodiment is provided with the fire transfer notch 89 at the front end of the air flow path member 35 constituting the burner unit 30, and is present at a position adjacent to the fire transfer notch 89. Although most of the gap s (see FIG. 17) formed in the bent portions of the engaging pieces 85, 86 to be closed is closed by the protruding portions 83a, 84a, the present invention is not limited to this. Alternatively, the protrusions 83 and 84 may not be provided.

  Although the combustion apparatus 10 of the present embodiment is configured to assist the fire transfer between the adjacent combustion sections 34 and 34 by providing the fire transfer notch 89, the present invention is not limited to this. The fire transfer notch 89 may be omitted. Further, as in the combustion apparatus 10 of the present embodiment, it is assumed that not all the air transfer notches 89 are provided in all the air flow path members 35 arranged in the case member 11, for example, the fire transfer is likely to be delayed. For example, the fire transfer notch 89 may be provided only in a part of the air flow path members 35, for example, the fire transfer notch 89 may be provided only in the air flow path member 35 existing in the portion.

  Further, as described above, even in the case where the air passage member 35 is not provided with the fire transfer notch portion 89, the region corresponding to the extension of the portion where the fire transfer notch portion 89 is provided in the above embodiment. As in the case where the openings 97 and 98, the long slits 92 and 93, and the short slits 95 and 96 are not provided, the openings 97 and 98 may not be provided in a predetermined region. In such a configuration, the airflow in the part where the openings 97, 98, etc. are not provided becomes gentler than in other parts, so that the fire transfer between the adjacent combustion parts 34, 34 proceeds smoothly in the part.

  The air flow path member 35 employed in the above-described burner unit 30 has an upper end than the valley fold portion L1 of the first and second partition wall structures 80 and 81 as shown in FIGS. The portions 80a and 81a are in surface contact with each other and have a portion that rises vertically upward (front end side) (hereinafter referred to as a rising portion if necessary). Was bent, and the engaging portion 90 was formed. However, if there is a rising portion as described above at the front end portion of the air flow path member 35, this may hinder the burning. Therefore, when there is such a concern, for example, a configuration in which there is no portion corresponding to the above-described rising portion, such as the air flow path member 151 of the burner unit 150 (combustion device) shown in FIG.

  In the burner units 30 and 150 described above, the air flow path members 35 and 151 have the first and second partition wall constituting members 80 and 81 and the first and second partition wall constituting members 160 and 170 engaged with each other on the distal end side. Therefore, even if the burner units 30 and 150 are both accompanied by the combustion operation and both the first and second partition wall structural members 80 and 81 and the first and second partition wall structural members 160 and 170 are heated, the extension and expansion of the both. Therefore, it is unlikely that any one of the first and second partition structural members 80 and 81 will be extremely greatly deformed or a large thermal stress will act on one of them. Therefore, even if the burner units 30 and 150 are used in a state where both the first and second partition wall constituting members 80 and 81 and the first and second partition wall constituting members 160 and 170 are heated, Problems such as cracks are unlikely to occur.

  In the burner unit 30 described above, the first engaging portions 90a and the second engaging portions 90b are alternately arranged in the longitudinal direction of the air flow path member 35, but the present invention is limited to this. Instead, the order of the first engaging portion 90a and the second engaging portion 90b may be changed as appropriate.

  In the above embodiment, in order to configure the engaging portion 90, the first and second partition structural members 80 and 81 are provided with a large number of engaging pieces 85 and 86, but the present invention is limited to this. For example, the entire upper end portion of one of the first and second partition wall constituting members 80 and 81 may be bent and the entire upper end portion of each other may be folded. Further, in the burner unit 30, the air flow path member 35 may be formed by bending a single steel plate like the air flow path member 203 employed in the burner unit 200 shown in FIG. Good. With this configuration, the manufacture of the burner unit 30 can be further simplified as compared with the case where a large number of engagement pieces 85 and 86 are provided.

  Further, in the burner unit 30 described above, the engaging portion 90 is caulked. Therefore, the burner unit 30 can firmly integrate them while ensuring the degree of freedom of expansion and deformation of the first and second partition structural members 80 and 81. In addition, in the said embodiment, although the structure which crimped the engaging part 90 was illustrated, it is good also as a structure which does not crimp the said part.

  The first and second partition wall structural members 80, 81, 160, and 170 exemplified in the above embodiment are each configured by forming irregularities or bending a single steel plate, but the present invention is not limited to this. For example, it is possible to combine a plurality of members provided for each part, or to superimpose two or more steel plates.

  In the above embodiment, the recesses 117 and 118 are provided in the air flow path member 35, and the openings 119 and 120 are provided in the lower inclined surfaces 117b and 118b constituting the recesses 117 and 118. However, the present invention is limited to this. It is not done. More specifically, the recesses 117 and 118 may not be provided in the air flow path member 35, and the corresponding portions may be flat, and those corresponding to the openings 119 and 120 may be provided in the flat portions. When such a configuration is adopted, there is no portion where the air flow that flows through the air flow path 82 abuts, such as the lower inclined surfaces 117b and 118b of the recesses 117 and 118 described above, that is, the surface that intersects the stream line of the air flow. Depending on the temperature of the air, the amount of air flowing out from the openings 119 and 120 may vary, but the configuration of the air flow path member 35 can be simplified. Therefore, when there is little variation in the air amount as described above, or when the necessity of considering the variation is low, the configuration of the air flow path member 35 is configured by not providing the recesses 117 and 118. It can be simplified.

  Moreover, in the said embodiment, by providing the communicating hole 73 in the inclined surfaces 71 and 71 in the base end side of the flame hole member 33, as shown by the route Q3 of the 2nd airflow route Q shown in FIG. Although a configuration in which a part of the air taken in from the mouth 143 can be supplied to the gap 140 is illustrated, the present invention is not limited to this. That is, a configuration in which the communication holes 73 are not provided in the inclined surfaces 71 and 71 and only the air flowing through the route P3 (see FIG. 18) of the first airflow route P described above may flow in the gap 140.

It is a conceptual diagram which shows typically the internal structure of the hot water supply apparatus concerning one Embodiment of this invention. It is a front view which shows the combustion apparatus concerning one Embodiment of this invention. It is a fracture perspective view showing the structure of the burner unit concerning one embodiment of the present invention. It is sectional drawing of the burner unit shown in FIG. It is a disassembled perspective view of the burner unit shown in FIG. It is sectional drawing which shows the decomposition | disassembly state of the burner unit shown in FIG. It is a perspective view which shows a pre-mixing member. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is a disassembled perspective view which shows a flame hole member. It is sectional drawing which shows a flame hole member. It is a perspective view which shows an air flow path member. (A) is AA sectional drawing of the air flow path member shown in FIG. 12, (b) is BB sectional drawing. (A) is a front view which shows the 1st partition structural member which comprises the air flow path member of FIG. 12, (b) is a side view of (a), (c) is the A section enlarged view of (a), (D) is the B section enlarged view of (a). (A) is a front view which shows the 2nd partition structural member which comprises the air flow path member of FIG. 12, (b) is a side view of (a), (c) is the A section enlarged view of (a), (D) is the B section enlarged view of (a). It is sectional drawing which shows the state before the assembly of the air flow path member shown in FIG. (A) is the A section enlarged view of FIG. 12, (b) is a front view of the part shown to (a), (c) is a B direction arrow directional view of (a). It is explanatory drawing of the airflow route P formed in the burner unit shown in FIG. It is explanatory drawing of the airflow route Q formed in the burner unit shown in FIG. It is explanatory drawing of the airflow route R formed in the burner unit shown in FIG. It is a perspective view which shows the positional relationship of a case member and a support frame. It is sectional drawing which shows the structure in the edge part vicinity of the burner unit in the combustion apparatus of this embodiment. It is the A section enlarged view of FIG. It is sectional drawing of a set plate. (A)-(d) is a perspective view explaining the assembly process of a set plate. It is a front view which shows the principal part of the modification of an air flow path member. It is a fracture | rupture perspective view which shows the structure of the burner unit concerning another embodiment of this invention. (A) is sectional drawing which shows the combustion apparatus of a prior art, (b) is a fracture | rupture perspective view which shows the burner unit which comprises the combustion apparatus of (a).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hot water supply apparatus 5 Heat exchange means 10 Combustion apparatus 30,150 Burner unit (combustion apparatus)
32 Premixing member 33 Flame hole member 34 Combustion part 34a First combustion region 34b Second combustion region 35, 151 Air channel member 36 Intermediate member 71 Inclined surface 73 Communication hole (side channel communication port)
75 Air gap (side channel)
80 First partition member 81 Second partition member 83, 84 Notch 83 a, 84 a Protruding part 85, 86 Engagement piece 87, 88 Engagement notch 89 Fire transfer notch part 90 Engagement part 90 a First engagement part 90 b Second engagement part 92, 93 Long slit (opening)
95,96 Short slit (opening)
97, 98, 112, 113, 119, 120 Opening 100, 101 Lateral groove (step)
117, 118 depression 117b, 118b downward inclined surface (crossing surface)
136 space (premixed gas inflow space)
137 Clearance (air mixing flow path)
145, 146 Air outlet 180 Set plate (partition member)
189 Energizing piece 195 1st air ejection part (air discharge port)
196 Second air outlet (air outlet)
199 Cooling air flow path

Claims (10)

A premixing member capable of premixing fuel gas and air to form a premixed gas;
A flame hole member disposed downstream of the premixing member in the flow direction of the premixed gas;
A partition wall member arranged on the side of the flame hole member and protruding toward the downstream side in the flow direction of the premixed gas supplied from the flame hole member,
A combustion part surrounded by the partition member and the flame hole member and extending in a longitudinal direction of the partition member;
The combustion section has a first combustion region on the upstream side in the flow direction of the premixed gas supplied from the flame hole member, and is on the downstream side in the flow direction of the premixed gas with respect to the first combustion region, and the partition wall Having a second combustion region on the tip side of the member;
The premixed gas supplied to the combustion section is burned in the first combustion region under an amount of air smaller than the theoretical air amount, and the premixed gas is completely burned in the combustion in the first combustion region. It is possible to supply the second combustion region with more air than the shortage of air and burn it,
A burner unit characterized in that a stepped portion comprising a concave portion and / or a convex portion extending in the longitudinal direction of the partition wall member is provided at a portion facing the combustion portion of the partition wall member.   The burner unit according to claim 1, wherein the step portion is provided with a plurality of concave portions and / or convex portions having different lengths so as to be intermittently arranged in the longitudinal direction of the partition wall member.   Of the concave portions and / or convex portions constituting the step portion, the length of the partition member provided on the longitudinal direction end side is longer than that provided on the longitudinal center side of the partition member. The burner unit according to claim 1 or 2.   The burner unit according to any one of claims 1 to 3, wherein the stepped portion is provided in a plurality of rows at a portion facing the combustion portion of the partition wall member. The partition member has an air flow path through which air can flow and an intersecting surface that intersects the flow direction of air introduced into the air flow path,
An opening capable of releasing the air flowing through the air flow path is provided on the intersecting surface,
The burner unit according to any one of claims 1 to 4, wherein the air discharged through the opening is supplied to the combustion section. Between the premixing member and the flame hole member, there is a premixed gas inflow space into which the premixed gas supplied from the premixed member can flow,
An air mixing channel capable of introducing air into the premixed gas inflow space;
A side flow path through which air supplied to the side of the premixed gas discharged from the flame hole member flows,
In the middle of the air mixing channel, a mixing channel crossing surface that intersects the flow direction of the air introduced into the air mixing channel is provided,
The burner unit according to any one of claims 1 to 5, wherein a side channel communication opening communicating with the side channel is provided on the crossing surface of the mixing channel. By being arranged inside a predetermined case member, the region of the combustion part is defined on the end side in the longitudinal direction of the partition wall member by the wall surface of the case member or other members arranged along the wall surface And
Inside the partition member, an air flow path through which air can flow and an air discharge port communicating with the air flow path are provided,
Through the air discharge port, a part or all of the air flowing through the air flow path can be discharged to the wall surface of the case member that defines the region of the combustion part or to other members arranged along the wall surface. The burner unit according to any one of claims 1 to 6, wherein A combustion apparatus having a case member and a blowing means, wherein a plurality of burner units according to any one of claims 1 to 6 are arranged in the case member,
Between the longitudinal direction one end side or both end sides of the burner unit, and the wall surface of the case member, a partition member arranged along the wall surface,
The partition member is urged in a direction away from the wall surface of the case member and is in contact with the longitudinal end of the burner unit, and a cooling air passage is formed between the wall surface of the case member, A combustion apparatus, wherein outside air is introduced into the cooling air flow path in accordance with the operation of the air blowing means. The case member is provided with a protrusion protruding toward the inside of the case member,
The combustion apparatus according to claim 8, wherein the protrusion is capable of contacting the partition member, and a distance between the partition member and the wall surface of the case member is equal to or greater than a predetermined interval. Combustion means for combusting fuel gas, and heat exchange means capable of heating the liquid using thermal energy generated by the combustion operation in the combustion means,
A hot water supply apparatus comprising the burner unit according to any one of claims 1 to 7 or the combustion apparatus according to any one of claims 8 or 9 as combustion means.

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