JP5283568B2 - Burner and combustor using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a burner, and a combustor using the same capable of forming stable flame by evenly mixing fuel gas and primary air. <P>SOLUTION: In the burner 1, protrusions 24 swelling in right and left directions are formed on a right side plate 21 and a left side plate 22 forming a lean gas mixing passage 26. Since a passage cross-sectional area of lean gas flowing through the lean gas mixing passage 26 becomes temporarily wide in right and left directions and then narrow again in a swelling part 240 formed on a portion between the protrusions 24, a flow of the lean gas is disturbed, and mixing of the lean gas is promoted in the swelling part 240. By this, the lean gas of evenly mixing the fuel gas and the primary air can be blown out from a lean flame port communicated with the lean gas mixing passage 26, and stable main flame can be formed. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a burner used in a combustion apparatus such as a water heater and a combustor using the burner.

  2. Description of the Related Art Conventionally, in a burner used in a plurality of juxtaposition devices such as a water heater, a burner is known in which a mixed gas in which a fuel gas ejected from a gas nozzle and primary air are mixed is ejected from a flame port and burned. ing. In order to form a stable flame at the flame outlet, it is necessary to uniformly mix the fuel gas and the primary air. In order to promote the mixing of the fuel gas and the primary air, in general, the mixing flow path for mixing the fuel gas and the primary air may be lengthened, but in this case, the size of the burner itself becomes large. There was a problem that the device could not be made compact.

  Thus, for example, there is known a gas burner that includes a gas introduction passage inside and has an obstacle projecting toward the gas introduction passage in the vicinity of the entrance of the gas introduction passage (see, for example, Patent Document 1). According to this gas burner, the fuel gas and the primary air introduced into the gas introduction passage collide with the obstacle near the entrance and diffuse. Thereby, mixing with fuel gas and primary air is accelerated | stimulated.

JP-A-7-243620

  However, in the gas burner described in Patent Document 1, since the mixed gas collides with the obstacle and diffuses, the flow of the mixed gas toward the flame port becomes unstable. Therefore, there has been a problem that the mixed gas is not stably supplied to the flame mouth, and a stable flame is not formed at the flame mouth.

  The present invention has been made to solve the above problems, and provides a burner capable of forming a stable flame by uniformly mixing fuel gas and primary air and a combustor using the burner. With the goal.

In order to achieve the above object, the burner of the invention according to claim 1 is formed with a mixing flow path for allowing the fuel gas ejected from the gas nozzle and the primary air to flow while mixing in a gap between a pair of opposing side walls. The mixed gas composed of the fuel gas and the primary air mixed in the mixing flow path is jetted from the flame port formed at the upper end portion and burned, and a plurality of the mixed gas is formed in a direction perpendicular to the side wall surface. in burners which are used side by side, in a position facing each other at each portion forming the mixing channel of the pair of side walls, a convex portion which bulges convexly outward are respectively formed, the said burner sidewall When a plurality of the projections are used side by side in a direction perpendicular to the surface, a predetermined gap is formed between the outer surface of the convex portion and the other burner by contacting the outer surface of the convex portion of another adjacent burner. Rukoto There is formed And features.

Further, the burner of the invention according to claim 2, in addition to the configuration of the invention according to claim 1, wherein the convex portion, in the side wall, characterized in that formed in plural along the mixing flow path .

According to a third aspect of the present invention, in addition to the configuration of the first or second aspect of the invention, the burner is a position facing each other at each part of the pair of side walls forming the mixing channel, and the convex Recesses that are recessed toward the mixing channel side are formed at positions excluding the portion , respectively.

According to a fourth aspect of the present invention, there is provided the burner according to the fourth aspect of the present invention , wherein a mixing flow path is formed in the gap between a pair of side walls facing each other to mix and distribute the fuel gas ejected from the gas nozzle and the primary air. In the burner used by arranging a plurality of the mixed gas composed of the fuel gas and the primary air in a flame outlet formed at the upper end portion and burning the gas mixture, in a direction perpendicular to the side wall surface, Of the pair of side walls, formed on a portion of the one side wall forming the mixing flow path, a convex portion bulging outward, and a portion forming the mixing flow path on the other side wall, In the case of using a plurality of the burners arranged in a direction orthogonal to the surface of the side wall, provided with a concave portion that is formed at a position facing the convex portion formed on the one side wall and is depressed on the mixing channel side, Outside the convex part There by contacting with an outer surface of the concave portion of the other burners adjacent, characterized in that a predetermined gap is formed between the other burner.

According to a fifth aspect of the present invention, in addition to the configuration of the fourth aspect of the present invention, the protruding dimension of the convex part is larger than the depth dimension of the concave part .

The combustor of claim 6, the burner according to any one of claims 1 to 5, characterized in that it is arranged more in the direction perpendicular to the plane of the side wall.

  In the burner according to the first aspect, the mixing flow path for allowing the fuel gas ejected from the gas nozzle and the primary air to flow while mixing is formed in the gap between the pair of side walls facing each other. A mixed gas composed of fuel gas and primary air is mixed in the mixing flow path, ejected from the flame opening, and burned. By forming a convex portion that bulges outward in the part of one of the pair of side walls that forms the mixing channel, the cross-sectional area of the mixing channel is The bulging part which spreads in the direction orthogonal to a surface is formed. A swirl of the mixed gas is generated at the bulging portion where the flow passage cross-sectional area of the mixed gas composed of the fuel gas and the primary air becomes wide. As a result of the swirling of the mixed gas, the flow of the mixed gas is disturbed, and the mixing of the mixed gas is promoted. Therefore, the mixed gas in which the fuel gas and the primary air are uniformly mixed can be stably supplied to the flame port, and a stable flame can be formed at the flame port.

  In addition, since the mixed gas is promoted by forming the convex portion on the side wall and forming the bulging portion in the mixing channel, a dedicated member for promoting the mixed gas may not be provided. Therefore, the mixing of the mixed gas can be promoted easily and inexpensively to form a stable flame.

  Further, in a state where a plurality of burners are arranged side by side, the outer surface of the convex portion abuts on the outer surface of the side wall of the adjacent burner, thereby forming a gap between the adjacent burners. Therefore, even if a plurality of burners are arranged side by side, it is possible to prevent the flame ports formed at the upper ends of the adjacent burners from approaching each other and to prevent the flame from interfering between the adjacent flame ports. Therefore, the combustion performance at each flame outlet can be improved.

  Moreover, since a clearance can be secured between adjacent burners, even when secondary air is required for combustion of the burner, the secondary air is supplied to each flame opening from the clearance between the burners. Since secondary air can be reliably supplied to each flame mouth, a stable flame can be formed in each flame mouth.

Also, when using burners arranged plurality in a direction perpendicular to the plane of the side wall, the outer surface of the convex portion is in contact with the outer surface of the convex portion of the other burners adjacent in a direction perpendicular to the side walls of each burner Positioning can be performed reliably. Therefore, the arrangement accuracy of the burner can be improved. Further, since it is possible to prevent rattling in a direction orthogonal to the side wall of the burner, it is possible to prevent the burner from being displaced even when transported in a state where a plurality of burners are arranged side by side. Further, it is possible to prevent the burner from rattling and causing noise during the combustion operation.

Moreover , since the convex part is formed in the position which a pair of side wall mutually opposes, the bulging part is formed in the mixing flow path in the part pinched | interposed into the convex part. Since the flow of the mixed gas is disturbed in the bulging portion where the flow channel cross-sectional area of the mixed flow channel extends in the direction perpendicular to the surface of the side wall, mixing of the mixed gas can be further promoted. Therefore, a more stable flame can be formed at the flame outlet. Also, when using burners arranged plurality in a direction perpendicular to the plane of the side wall, the outer surface of the convex portion is in contact with the outer surface of the convex portion of the other burners adjacent, between the adjacent burner, A gap is reliably formed. Therefore, even when secondary air is required for burning the burner, the secondary air can be reliably supplied to each flame port formed at the upper end of the burner. Further, it is possible to prevent the flame from interfering between adjacent flame openings.

In addition, in the burner according to claim 2 , in addition to the effect of the invention according to claim 1 , a plurality of convex portions are formed along the mixing flow path on the side wall, so that the mixed gas flows in the mixing flow path. Certainly the flow is disturbed. Therefore, mixing of the mixed gas can be further promoted.

In addition, in the burner according to claim 3 , in addition to the effect of the invention according to claim 1 or 2 , the recesses recessed on the mixing channel side face each other at each part forming the mixing channel of the pair of side walls. And since it forms in the position except a convex part, the flow-path cross-sectional area of a mixing flow path can be once narrowed, and the flow of mixed gas can be disturbed further. That is, the mixed gas flowing through the mixing channel collides with the inner surface on the upstream side of the side wall where the recess is formed, and forms a vortex. And the mixed gas which passed the part in which the recessed part was formed forms a vortex again in the part where the flow-path cross-sectional area of a mixing flow path becomes large. Thus, since the vortex can be generated on the upstream side and the downstream side of the portion where the recess is formed, the flow of the mixed gas can be further disturbed, and the mixing of the mixed gas can be further promoted.

Further, the concave portion, so are respectively formed in mutually opposing positions of the pair of side walls, it can be a mixing channel provided and contraction portion and拡流portion. In the portion sandwiched between the recesses, the cross-sectional area of the mixing channel is narrowed in the direction perpendicular to the side wall surface, so that the mixed gas flow is disturbed in the portion sandwiched between the recesses. Therefore, the mixed gas flow can be reliably disturbed to further promote the mixing of the mixed gas.

In the burner according to 請 Motomeko 4, and the concave portion and the convex portion, since it is formed at positions facing each other, the gas mixture flowing in the mixing flow path can be tortuous. By changing the flow direction of the mixed gas, the flow of the mixed gas is disturbed, and the mixing of the mixed gas can be promoted. In addition, the mixing channel can be lengthened while maintaining the burner dimensions. Therefore, mixing of the mixed gas can be promoted while achieving compactness of the burner.
Further, in the burner according to claim 5, in addition to the effect of the invention according to claim 4, the projecting dimension of the convex part is larger than the depth dimension of the concave part. Since the outer surface of the convex part comes into contact with the outer surface of the concave part of another adjacent burner, a predetermined gap is secured between the flame openings. It can be the sum of the depth dimensions. Therefore, it is possible to determine the protrusion dimension of the convex portion to an optimum value while maintaining a suitable gap dimension.

A combustor according to a sixth aspect is configured by arranging a plurality of burners according to any one of the first to fifth aspects in a direction perpendicular to the surface of the side wall. Therefore, the outer surface of the convex part formed in each burner contacts the outer surface of the side wall, and a gap is secured between the adjacent burners. Since it can prevent that each flame mouth formed in the upper end part of each burner approaches too much, interference of the flame between each flame mouth can be prevented. Moreover, the combustibility in each burner can be improved.

  Further, even when secondary air is required for burning the burner, the secondary air is supplied to each flame port from the gap between the flame ports. Since the outer surface of the convex part comes into contact with the outer surface of the adjacent convex part and a gap can be ensured between the adjacent flame ports, secondary air is surely supplied to each flame port. Can do. Therefore, a stable flame can be formed at each flame outlet.

  Moreover, since the convex part formed in each burner is arrange | positioned in the clearance gap formed between adjacent flame opening parts, a convex part can be provided in a burner, maintaining the dimension of a combustor. Therefore, the combustor which can improve combustibility can be provided, achieving compactness.

  Moreover, since the outer side surface of the convex part comes into contact with the outer side surface of the side wall of the adjacent burner, each burner to be arranged can be positioned with certainty. Therefore, the arrangement accuracy of the burner can be improved. Moreover, since the rattling in the direction orthogonal to the side wall of the burner can be prevented, the burner can be prevented from being displaced even when the combustor is transported. Further, it is possible to prevent the burner from rattling and causing noise during the combustion operation.

1 is a perspective view of a combustor 100. FIG. 1 is a perspective view of a burner 1. FIG. 1 is an exploded perspective view of a burner 1. FIG. 1 is an exploded perspective view of a combustor 100. FIG. FIG. 5 is a partially enlarged view of a cross-section in the direction of arrow II in FIG. 4. It is explanatory drawing of the flow of the light gas in the light gas mixing channel | path 26. FIG. It is a perspective view of the burner 201 which is a 1st modification. FIG. 6 is a cross-sectional view along a light gas mixing passage 228 of a plurality of burners 201 arranged side by side. It is a perspective view of the burner 301 which is a 2nd modification. It is sectional drawing along the light gas mixing channel | path 328 of the burner 301 arranged in multiple numbers. It is a perspective view of the burner 401 which is a 3rd modification. It is sectional drawing along the light gas mixing channel | path 428 of the burner 401 arranged in multiple numbers.

  Hereinafter, a combustor 100 and a burner 1 according to an embodiment of the present invention will be described with reference to the drawings. A combustor 100 shown in FIG. 1 is mounted and used in a housing such as a gas water heater. The combustor 100 includes a burner case 101 having an upper opening, and a plurality of burners 1 are arranged in parallel inside the burner case 101.

  Next, the structure of the burner 1 provided in parallel with the combustor 100 will be described with reference to FIGS. 2 and 3. 2 will be described as the front side of the burner 1, the upper right side as the rear of the burner 1, the lower right side as the right side of the burner 1, and the upper left side as the left side of the burner 1.

  The burner 1 is a low NOx burner having a flame mouth portion 30 including a central pale flame mouth 87 and a right rich flame mouth 97 and a left rich flame mouth 98 sandwiching both sides of the pale flame mouth 87. The main flame is formed by burning a fuel-air mixture (hereinafter, referred to as “light gas”) having a fuel lower than the stoichiometric air-fuel ratio at the light flame port 87 to form a main flame. A fuel / air mixture (hereinafter, referred to as rich gas) having a fuel richer than the stoichiometric air-fuel ratio is burned at the flame port 98 to form a sleeve fire.

  As shown in FIG. 2 and FIG. 3, the burner 1 is integrated with a thin burner unit 20 formed in a thin box shape with an opening at the top, and by caulking and spot welding so as to sandwich both sides of the light burner unit 20. And a dark burner unit 40 connected to each other. A rectifying member 70 is disposed inside the upper portion of the light burner unit 20.

  First, the structure of the light burner unit 20 will be described with reference to FIG. The light burner unit 20 is formed by folding and stacking a substantially rectangular sheet metal having a concavo-convex shape formed by press molding at the center. The light burner unit 20 includes a right side plate 21 and a left side plate 22 facing the right side plate 21, and is formed in a thin box shape having a substantially rectangular shape in a side view with an upper portion opened. A pale flame port 87 is formed between the upper end portion of the right side plate 21 and the upper end portion of the left side plate 22. The right side plate 21 and the left side plate 22 are fixed by caulking at the front end portion 33 and the rear end portion 34 except for the light gas inlet 25 and the notch portion 36 provided at the lower portion of the front end portion of the light burner unit 20. . The light gas inlet 25 opens forward and has an oblong shape when viewed from the front. The notch 36 is notched at the lower part of the rear end 34 and has a triangular shape in side view.

  When the light burner unit 20 is viewed from the front, the right side plate 21 and the left side plate 22 have a bilaterally symmetric shape except for the peripheral end portion. By overlapping the right side plate 21 and the left side plate 22, a flow path of the light gas from the light gas inlet 25 to the light flame port 87 is formed in the gap between them.

  The right side plate 21 is formed in a substantially rectangular shape in side view. The right side plate 21 is formed with a light gas passage forming portion 23 bulging in the right direction. The light gas passage forming portion 23 is provided at a front portion near the lower end portion of the right side plate 21 and is formed substantially parallel to the lower end portion, and a light gas mixing passage forming portion 126 is formed. 126, a light gas communication passage forming portion 127 bent upward from the rear end portion thereof, and a light gas distribution provided above the light gas communication passage forming portion 127 and formed in a substantially inverted triangular shape when viewed from the side. The chamber forming unit 128 and the pale gas distribution chamber forming unit 128 are provided above the pale gas distribution chamber forming unit 128, and the pale flame mouth forming unit 135 is formed in a substantially rectangular shape in a side view. A convex portion 24 having a substantially elliptical shape in a side view projecting outward is provided at the approximate center of the light gas mixing passage forming portion 126. A groove portion 29 that is recessed inwardly extends in the light flame outlet forming portion 135 in the front-rear direction of the light burner unit 20. When the burner 1 is also viewed from the front, the left plate 22 also has a light gas mixing passage forming portion 126, a light gas communication passage forming portion 127, a light gas distribution chamber forming portion 128, and a light flame outlet forming portion of the right plate 21. 135 and each formation part which is right-and-left object shape are each provided.

  And the light gas flow path is formed in the clearance gap between the right side board 21 and the left side board 22 when the right side board 21 and left side board 22 provided with each said formation part mutually overlap. The light gas flow path extends in the front-rear direction of the burner 1 in order from the upstream side, and is a substantially straight light gas mixing passage 26 communicating with the light gas inlet 25 and the downstream end of the light gas mixing passage 26. A communication gas passage 27 bent upward from the downstream side, a light gas distribution chamber 28 having an inverted triangular shape in a side view in which the flow path width is expanded in the front-rear direction of the burner 1 from the downstream end of the communication passage 27, and the light gas distribution chamber 28 And a pale flame mouth portion 35 having a substantially rectangular shape in side view and communicating with the pale flame mouth 87.

  As described above, the right side plate 21 and the left side plate 22 that form the light gas mixing passage 26 are respectively formed with convex portions 24 that protrude outward. A bulging portion 240 (see FIG. 6) in which the flow gas cross-sectional area of the light gas flowing through the light gas mixing passage 26 extends in the left-right direction is formed at a portion sandwiched between the convex portions 24 in the light gas mixing passage 26. .

  A rectifying member 70 is disposed in the pale flame mouth portion 35. As shown in FIG. 3, the rectifying member 70 is a unit member having six horizontally long rectifying plates 71, 72, 73, 74, 75, and 76 in which irregularities are formed by pressing. In the rectifying member 70, the rectifying plates 71 to 76 are arranged at predetermined intervals in the horizontal direction, and both ends in the longitudinal direction are bent together and fixed by caulking. At the upper part of the front end portion and the rear end portion of the rectifying member 70, flanges 77 and 78 extending in the left-right direction are provided, respectively. In the light flame opening portion 35, the light gas flows through each gap formed between the six rectifying plates 71, 72, 73, 74, 75, and 76.

  Next, the dark burner unit 40 will be described with reference to FIG. The dark burner unit 40 is formed by press forming or spot welding a sheet metal, and is formed in a substantially rectangular shape in side view. The dark burner unit 40 includes a right side plate 41 that covers the outer side surface of the right side plate 21 of the light burner unit 20 and a left side plate 42 that covers the outer side surface of the left side plate 22 of the light burner unit 20. When the dark burner unit 40 is viewed from the front, the right side plate 41 and the left side plate 42 have a symmetrical shape except for the peripheral end portion. At the upper end portions of the right side plate 41 and the left side plate 42, five connecting pieces 54 for connecting the two are provided side by side in the front-rear direction of the dark burner unit 40 at a predetermined interval. Since the right side plate 41 and the left side plate 42 are bilaterally symmetric, only the right side plate 41 will be described here, and the description of the left side plate 42 will be omitted.

  The right side plate 41 having a substantially rectangular shape in side view is formed with a concentrated gas passage forming portion 43 bulging in the right direction. The rich gas passage forming portion 43 is folded upward from the throat-like rich gas introduction passage forming portion 146 provided substantially parallel to the lower end portion of the right side plate 41 and the rear end portion of the rich gas introduction passage forming portion 146. A concentrated concentrated gas communication passage forming section 147, a concentrated gas distribution chamber forming section 150 provided above the concentrated gas communication path forming section 147 and having a flow path width expanded in the front-rear direction of the concentrated burner unit 40, and a concentrated gas distribution It is composed of a thick flame mouth forming portion 153 having a substantially rectangular shape in a side view provided above the chamber forming portion 150.

  As shown in FIG. 2, the dark burner unit 40 is fixed to the light burner unit 20 by caulking at the front end portion and the rear end portion except for the concentrated gas inlet 45, and fixed by spot welding or the like at the lower end portion. ing. The concentrated gas inlet 45 opens forward and has a circular shape when viewed from the front. The opening area of the rich gas inlet 45 is smaller than the opening area of the light gas inlet 25. By fixing the dark burner unit 40 to the light burner unit 20, the gap between the right side plate 41 of the dark burner unit 40 and the right side plate 21 of the light burner unit 20, and the left side plate 42 of the dark burner unit 40 A concentrated gas flow path is formed in the gap between the light burner unit 20 and the left side plate 22. The flow path of the concentrated gas formed in the gap between the right side plate 21 and the right side plate 41 and the flow path of the concentrated gas formed in the gap between the left side plate 22 and the left side plate 42 are the same. Now, only the former will be described, and the description of the latter will be simplified.

  The concentrated gas passage formed in the gap between the right side plate 21 and the right side plate 41 extends in the front-rear direction of the burner 1 in order from the upstream side, and is connected to the concentrated gas passage 46 communicating with the concentrated gas introduction port 45. The concentrated gas passage 46 is bent upward from the downstream end thereof, and the concentrated gas having an inverted triangular shape in a side view whose channel width is expanded from the downstream end of the communicating passage 27 in the front-rear direction of the burner 1. It consists of a distribution chamber 50 and a thick flame port 53 that is located above the rich gas distribution chamber 50 and has a substantially rectangular shape in side view. A right rich flame port 97 is formed in a gap between the upper end portion of the right side plate 21 and the upper end portion of the right side plate 41.

  Since the left side plate 42 of the dark burner unit 40 covers the left side plate 22 of the light burner unit 20 from the left side, a flow path through which concentrated gas flows is similarly formed in the gap between the left side plate 22 and the left side plate 42. . A left rich flame port 98 is formed in the gap between the upper end portion of the left side plate 22 and the upper end portion of the left side plate 42. As described above, the flow path of the rich gas is partitioned by the light burner unit 20 at the center in the left-right direction of the burner 1.

  Next, a method for assembling the burner 1 will be described with reference to FIGS. First, as shown in FIG. 3, the rectifying member 70 is inserted into the light flame opening 35 of the light burner unit 20 from above and fixed. The flanges 77 and 78 formed at the front end portion and the rear end portion of the rectifying member 70 are engaged with the upper end portions of the right side plate 21 and the left side plate 22 of the light burner unit 20. In this way, the rectifying member 70 is held in the pale flame mouth portion 35.

  Next, the lower end portions of the right side plate 41 and the left side plate 42 of the dark burner unit 40 are opened on both sides, and the light burner unit 20 is covered from above and sandwiched inside. The connecting piece 54 of the rich burner unit 40 is brought into contact with the upper end of the light burner unit 20, and the rich gas inlet 45 is positioned above the light gas inlet 25. In this state, the strip-shaped caulking piece provided at the front end portion 57 of the dark burner unit 40 is bent so as to hold the front end portion 33 of the light burner unit 20 inside, and caulking is performed. Further, the strip-shaped crimping piece provided at the rear end portion 58 of the dark burner unit 40 is bent so as to hold the rear end portion 34 of the light burner unit 20 inward, and then crimped. Finally, the assembly of the burner 1 is completed by performing spot welding, pressing, or the like at places.

  As shown in FIG. 2, in the assembled burner 1, the light gas inlet 25 opens forward at the lower part of the front end portion, and the concentrated gas inlet 45 is forward of the upper part of the light gas inlet 25. Open toward. A pale flame mouth 87 is formed at the center in the left-right direction of the upper end portion of the burner 1, and a right rich flame mouth 97 and a left rich flame mouth 98 are formed on both sides of the pale flame mouth 87, respectively. The width dimension (the dimension in the left-right direction) of the burner 1 is the largest in the part where the convex part 24 is formed. That is, the outer side surface of the convex portion 24 formed on the right side plate 21 is the right end of the burner 1, and the outer side surface of the convex portion 24 formed on the left side plate 22 is the left end of the burner 1.

  Next, the combustor 100 in which the burner 1 is disposed will be described with reference to FIGS. 1 and 4. 1 and 4, the diagonally upper right is the front of the combustor 100, the diagonally lower left is the rear of the combustor 100, the diagonally upper left is the right side of the combustor 100, and the diagonally lower left is the combustor 100. The following description will be made on the left side. The combustor 100 includes a burner case 101 having a substantially rectangular parallelepiped shape whose upper part is open. Inside the burner case 101, a plurality of the above-described burners 1 are arranged in parallel at a predetermined center distance in the left-right direction of the combustor 100.

  First, the burner case 101 will be described. As shown in FIG. 4, the burner case 101 has a bottom plate 104 having a substantially rectangular shape in plan view, a right plate 105 erected on the upper surface of the right end portion of the bottom plate 104, and an upper surface of the left end portion of the bottom plate 104. A left plate 106 provided, a front plate 110 erected from the front end portion of the bottom plate 104, and a rear plate 120 provided between the upper half of each rear end portion of the right plate 105 and the left plate 106. I have.

  The bottom plate 104 will be described. As shown in FIG. 4, the bottom plate 104 is provided with a plurality of through holes 107 arranged in a lattice pattern. Combustion air blown from a blower (not shown) provided below the burner case 101 is taken into the burner case 101 through these through holes 107.

  The front plate 110 will be described. As shown in FIG. 4, the front plate 110 includes a front rectangular gas introduction portion 111 erected on the front end side of the bottom plate 104 and a right angle from the upper end portion of the gas introduction portion 111 toward the outside of the burner case 101. A bent portion 112 that is bent and an upright portion 113 that rises from a front end portion of the bent portion 112 are provided. A concentrated gas supply port 114 that is an opening for supplying concentrated gas to the burner 1 from the outside of the burner case 101 is formed in the upper part of the gas introduction part 111 side by side with a predetermined interval. The opening shape of the concentrated gas supply port 114 is circular. The concentrated gas supply port 114 includes an annular portion 115 that is formed by burring and rises annularly from the periphery of the opening.

  Below the concentrated gas supply port 114, a light gas supply port 116 that is an opening for supplying light gas to the burner 1 from the outside of the burner case 101 is provided. The opening shape of the light gas supply port 116 is a vertically long ellipse. The opening area of the light gas supply port 116 is larger than the opening area of the concentrated gas supply port 114. The light gas supply port 116 of the light gas supply port 116 is formed by burring and includes an annular portion 117 that rises in an annular shape from the periphery of the opening. The positions of the center of the rich gas supply port 114 and the center of the light gas supply port 116 in the left-right direction are the same.

  The rear plate 120 will be described. As shown in FIG. 4, the rear plate 120 includes a cross-sectionally extending portion 121 having a substantially rectangular shape when viewed from the front, an upper positioning portion 122 bent at a right angle from the upper end portion of the extending portion 121 toward the inside of the burner case 101, And a lower positioning portion 123 bent at a right angle from the lower end portion of the delivery portion 121 toward the inside of the burner case 101. The right end portion of the passing portion 121 is screwed to the rear end portion of the right plate 105. The left end portion of the passing portion 121 is screw-fixed to the rear end portion of the left plate 106. In the upper positioning portion 122, slits 124 each having a substantially triangular shape in plan view are formed with a predetermined distance therebetween. The lower positioning portion 123 is also formed with slits (not shown) having a substantially triangular shape in plan view with a predetermined distance therebetween. The positions of the slit 124 provided in the upper positioning portion 122 and the slit (not shown) provided in the lower positioning portion 123 in the left-right direction are the same.

  Next, a procedure for attaching the burner 1 to the burner case 101 will be described with reference to FIG. First, in the burner case 101, the rear plate 120 is removed, and the burner 1 is moved in a horizontal direction in a standing posture from the rear to the inside of the burner case 101. Then, the rich gas inlet 45 (see FIG. 2) is extrapolated to the annular portion 115 of the dense gas supply port 114, and the light gas inlet 25 (see FIG. 2) is extrapolated to the annular portion 117 of the pale gas supply port 116. Let At this time, the lower end of the burner 1 is placed on the upper surface of the bottom plate 104.

  After all the burners 1 are disposed on the bottom plate 104, the rear plate 120 is attached. At this time, the upper part of the rear end of the burner 1 is inserted into the slit 124 of the upper positioning part 122, and the notch 36 is inserted into the slit (not shown) of the lower positioning part 123. Thus, the attachment of the burner 1 to the burner case 101 is completed. As described above, in the burner 1, the burner 1 is disposed in the burner case 101 by the annular portion 115, the annular portion 117, the slit 124 of the upper positioning portion 122, and the slit (not shown) of the lower positioning portion 123. Positioning with respect to the case 101 is made.

  As shown in FIG. 5, in each burner 1 disposed in the burner case 101, the outer surface of the convex portion 24 formed on the right side plate 21 of the light burner unit 20 is on the left side plate 22 of the adjacent burner 1. The outer surface of the convex part 24 formed is in contact. Further, as described above, the dimension in the width direction (left-right direction) of the burner 1 is the largest in the portion where the convex portion 24 is formed. Therefore, a gap 10 is formed between the right side plate 21 and the left side plate 22 of the adjacent burners 1 except for the portion where the adjacent convex portions 24 are in contact with each other. In the burner 1, not only is the positioning with respect to the burner case 101 being arranged in the burner case 101, but the center-to-center distance between adjacent burners 1 is maintained by the convex portion 24.

  Next, flame formation in each burner 1 will be described. First, the flame formation of the main flame formed in the pale flame mouth 87 will be described with reference to FIGS. 3 and 6. In front of the burner case 101 (see FIG. 1), a light gas nozzle (not shown) for jetting fuel gas is arranged to face the light gas inlet 25 shown in FIG. Fuel gas is jetted from the light gas nozzle to the light gas inlet 25 through the light gas supply port 116 (see FIG. 4). At this time, primary air is taken in from the surroundings by the fuel gas flow, and fuel gas and primary air are fed into the light gas inlet 25.

  As shown in FIG. 3, the fuel gas and primary air sent to the light gas inlet 25 are supplied to a light gas mixing passage 26 communicating with the light gas inlet 25. The mixture of the fuel gas and the primary air (fresh gas) supplied to the fresh gas mixing passage 26 reaches the communication passage 27 via the bulging portion 240 formed in the portion sandwiched between the convex portions 24. And supplied to the light gas distribution chamber 28. In the light gas distribution chamber 28, the light gas flows upward while diffusing in the front-rear direction of the burner 1, and flows into the light flame opening 35 from below. The pale gas that has flowed into the pale flame mouth portion 35 flows through the gap between the rectifying plates 71 to 76, is ejected from the pale flame mouth 87, and burns. In this way, a main flame is formed at the pale flame port 87.

  Here, the flow of the light gas in the portion sandwiched between the convex portions 24 will be described in detail with reference to FIG. The lower part of FIG. 6 is described as the front of the light gas mixing passage 26 (upstream side in the direction in which the light gas flows). Fuel gas is supplied from the front of the burner 1 to the rear from a gas nozzle (not shown) to the light gas inlet 25 (see FIG. 3). Therefore, in the vicinity of the light gas inlet 25, the light gas flows almost linearly through the light gas mixing passage 26 from the front to the rear and reaches the bulging portion 240.

  The cross-sectional area of the flow path of the light gas flowing through the light gas mixing passage 26 once widens in the left-right direction at the bulging portion 240 and then becomes narrow again. At this time, as a flow of the light gas, a flow along the inner surface of the convex portion 24 is formed in addition to a flow linearly moving from the front (lower side in FIG. 6) to the rear. A negative pressure region having a gas pressure lower than that of other regions is formed between the flow linearly moving from the front to the rear and the flow along the inner surface of the convex portion 24.

  The light gas that has flowed along the inner surface of the convex portion 24 is drawn into the negative pressure region and once flows backward from the rear toward the front. The counterflowing light gas collides with the light gas flowing from the front toward the rear and the light gas flowing along the inner surfaces of the right side plate 21 and the left side plate 22 and flows again from the front toward the rear. Thus, a swirl of light gas is formed in the bulging portion 240. Due to the formation of the vortex, the flow of the light gas is disturbed in the bulging portion 240. As a result of the turbulence in the flow, the mixing of the light gas is promoted in the bulging portion 240.

  In this way, the fuel gas and the primary air are reliably mixed in the light gas mixing passage 26, and the light gas passes through the communication passage 27, the light gas distribution chamber 28, and the light flame opening 35 as shown in FIG. , And ejected from the flaming port 87. Since the pale gas in which the fuel gas and the primary air are uniformly mixed is ejected from the pale flame port 87, a stable main flame can be formed.

  Next, the formation of the flame of the sleeve fire formed at the right rich flame port 97 and the left rich flame port 98 will be described with reference to FIG. In addition, since the mechanism of the flame formation of the sleeve flame formed in the right dense flame opening 97 and the left flame opening 98 is the same, only the flame formation of the sleeve flame formed in the right flame opening 97 will be described.

  In front of the burner case 101 (see FIG. 1), a rich gas nozzle (not shown) for jetting fuel gas is arranged to face the rich gas inlet 45 shown in FIG. Fuel gas is ejected from the rich gas nozzle to the rich gas inlet 45. At this time, since the primary air is taken in from the surroundings by the fuel gas flow, the fuel gas and the primary air are sent into the concentrated gas inlet 45. Here, since the opening area of the rich gas inlet 45 is smaller than the opening area of the light gas inlet 25 as described above, the amount of primary air fed into the rich gas inlet 45 is the light gas inlet 25. Less than the amount of primary air fed into the. Therefore, the mixture of the fuel gas and the primary air (concentrated gas) sent to the rich gas inlet 45 is more than the mixture of the fuel gas and the primary air (pure gas) sent to the pale gas inlet 25 as a pale gas. Even fuel gas concentration is high.

  As described above, since the rich burner unit 40 sandwiches the light burner unit 20, the rich gas sent to the rich gas inlet 45 is diverted by the light burner unit 20. Specifically, the dark burner unit 20 right side plate 21 and the dark burner unit 40 right side plate 41 and the light burner unit 20 left side plate 22 and the dark burner unit 40 left side plate 42 are dark. A gas flow path is formed.

  The rich gas supplied between the right side plate 21 and the right side plate 41 is mixed in the rich gas passage 46 and supplied to the rich gas distribution chamber 50 through the rich gas communication passage 47. In the rich gas distribution chamber 50, the rich gas flows upward while diffusing in the front-rear direction of the burner 1, and is ejected from the right rich flame port 97 via the rich flame port 53. The rich gas ejected from the right rich flame port 97 takes in the secondary air flowing upward from below through the gap 10 (see FIG. 5) between the adjacent burners 1 and burns. In this way, a sleeve fire is formed at the right rich flame outlet 97. Similarly, the rich gas supplied between the left side plate 22 and the left side plate 42 also flows between the left side plate 22 and the left side plate 42 and is ejected from the left rich flame port 98 to form a sleeve fire.

  Here, the flow of the secondary air used for forming the sleeve fire will be described. A blower (not shown) that blows combustion air is provided below the combustor shown in FIG. A part of the combustion air blown from a blower (not shown) passes through a plurality of through holes 107 (see FIG. 4) provided in the bottom plate 104 of the burner case 101 as secondary air. Captured inside. The secondary air taken into the burner case 101 flows upward from below through the gaps 10 (see FIG. 5) between the plurality of burners 1 disposed in the burner case 101, and the right rich flame port 97 and the left It is supplied to the rich flame port 98.

  As shown in FIG. 5, in the burner 1 disposed in the burner case 101, the outer surface of the convex portion 24 provided on the right side plate 21 of the light burner unit 20 is provided on the left side plate 22 of the adjacent burner 1. The outer surface of the projected portion 24 is in contact. Thereby, since the clearance gap 10 is reliably ensured between the adjacent burners 1, the flow path of secondary air is ensured reliably. Therefore, secondary air can be reliably supplied to the right rich flame port 97 and the left rich flame port 98, and stable sleeve fires can be formed at the right rich flame port 97 and the left rich flame port 98, respectively. .

  As described above, in the burner 1 of the present embodiment, the right side plate 21 and the left side plate 22 that form the light gas mixing passage 26 are formed with convex portions 24 that bulge outward in the left-right direction. The cross-sectional area of the light gas flowing through the light gas mixing passage 26 once widens in the left-right direction at the bulging portion 240 and then becomes narrow again. As described above, a vortex flow of light gas is formed in the bulging portion 240. Due to the formation of the vortex, the flow of the light gas is disturbed in the bulging portion 240. As a result of the turbulence in the flow, the mixing of the light gas is promoted in the bulging portion 240. Therefore, the pale flame in which the fuel gas and the primary air are uniformly mixed can be ejected from the pale flame port 87, and a stable main flame can be formed.

  In addition, in order to promote the mixing of the light gas, the convex portion 24 is provided, the bulging portion 240 is formed in the light gas mixing passage 26, and the flow path of the light gas is disturbed, thereby promoting the mixing of the light gas. It is not necessary to provide a dedicated member. And since the convex part 24 is formed by expanding the right side board 21 and the left side board 22 by press work, it is not necessary to provide the manufacturing process for forming the convex part 24 purposely. Therefore, the mixing of the light gas can be promoted easily and inexpensively to form a stable main flame.

  Further, in a state where the burner 1 is disposed in the burner case 101, the outer surface of the convex portion 24 is in contact with the outer surface of the adjacent convex portion 24. As a result, the gap 10 is reliably secured between the adjacent burners 1, so that the secondary air supplied from below the burner 1 flows through the gap 10, and the right rich flame port 97 and the left rich flame port 98. Surely supplied. Therefore, stable sleeve fires can be formed at the right rich flame port 97 and the left rich flame port 98, respectively.

  Moreover, since the clearance gap 10 is ensured between adjacent burners 1, the interference of the flame between each burner 1 can be prevented. Therefore, the combustibility of the combustor 100 can be further improved.

  Further, in a state where the burner 1 is disposed in the burner case 101, the outer surface of the convex portion 24 contacts the outer surface of the adjacent convex portion 24, so that the burner 1 can be prevented from rattling in the left-right direction. Therefore, the position shift of the burner 1 at the time of transportation of the combustor 100 or the water heater equipped with the combustor 100 can be prevented. Further, it is possible to prevent the burner 1 from rattling and making noise during the combustion operation of the water heater.

  Next, the burner 201 which is the 1st modification of this embodiment is demonstrated with reference to FIG. 7 and FIG. In the above embodiment, one convex portion 24 is provided on each of the right side plate 21 and the left side plate 22 of the light burner unit 20, whereas in the burner 201 which is the first modification, a plurality of convex portions are provided on each side plate. Is provided. In addition, since the burner 201 has substantially the same structure as that of the above embodiment, the same reference numerals as those of the above embodiment are given to the same structural portions, and description thereof is omitted or simplified.

  As shown in FIG. 7, the light burner unit 220 of the burner 201 includes a right side plate 221 and a left side plate 222 that are substantially rectangular in a side view and are symmetrical to each other. A light gas flow path is formed in the gap between the right side plate 221 and the left side plate 222.

  The right side plate 221 includes a light gas mixing passage forming portion 226 formed in the vicinity of the lower end portion of the right side plate 221 and bulging in the right direction substantially parallel to the lower end. A convex portion 224 and a convex portion 225 are formed on the front side and the rear side of the light gas mixing passage forming portion 226 in front of and behind the center in the front-rear direction so as to protrude in the right direction.

  As shown in FIG. 8, the left side plate 222 is formed with a light gas mixing passage forming portion 227 formed to bulge leftward at a position facing the light gas mixing passage forming portion 226. In the light gas mixing passage forming portion 227, a convex portion 234 is provided at a position facing the convex portion 224 of the light gas mixing passage forming portion 226, and a convex portion 235 is formed at a position facing the convex portion 225. The size of each burner 201 (see FIG. 7) in the width direction (left-right direction) is the largest in the portion where the convex portions 224, 225, 234, 235 are formed.

A light gas mixing passage 228 is formed in the gap between the light gas mixing passage formation portion 226 and the light gas mixing passage formation portion 227. The light gas mixing passage 228 is formed in the vicinity of the lower end portion of the light burner unit 220 (see FIG. 7) substantially parallel to the lower end portion. As shown in FIG. 8, the flow of the light gas flow path is in the portion sandwiched between the convex portions 224 and 234 of the fresh gas mixing passage 228 and the portion sandwiched between the convex portions 225 and 235. The bulging part which a road cross-sectional area spreads in the left-right direction is each formed.

  According to the burner 201 of the first modification, the fresh gas flowing through the fresh gas mixing passage 228 is sandwiched between the convex portions 224 and the convex portions 234 of the fresh gas mixing passage 228 formed at two locations, and Disturbed at the portion sandwiched between the convex portion 225 and the convex portion 235. Therefore, mixing of the light gas can be promoted more reliably.

  Further, as shown in FIG. 8, when a plurality of burners 201 are used in parallel in a burner case, the outer surface of the convex portion 224 of the adjacent burner 201 and the outer surface of the convex portion 234 come into contact with each other. The outer surface of the convex portion 225 and the outer surface of the convex portion 235 are in contact with each other. As described above, the size of the burner 201 in the width direction (left-right direction) is the largest in the portion where the convex portions 224, 225, 234, and 235 are formed, so that the convex portion is between the adjacent burners 201. A gap 11 is formed at a portion other than the portion where 224, 225, 234, and 235 are formed. At this time, since the convex portions 224, 225, 234, and 235 function as spacers for securing the gap 11, the gap 11 can be reliably formed. As in the above embodiment, the secondary air flows through the gap 11 between the adjacent burners 201 and is supplied to the flame opening 30 of the burner 201. Secondary air can be reliably supplied. In addition, since the gap 11 can be secured, it is possible to suppress the interference of the flame between the adjacent flame openings 30.

  Next, the burner 301 which is the 2nd modification of this embodiment is demonstrated with reference to FIG. 9 and FIG. In the first modified example, a plurality of convex portions are provided on the right side plate 221 and the left side plate 222 of the light burner unit 220, respectively, whereas in the second modified example, a plurality of convex portions and concave portions are provided. ing. In addition, since the burner 301 is provided with the structure substantially the same as the 1st modification mentioned above, the same code | symbol as a 1st modification is attached | subjected and description is abbreviate | omitted or simplified.

  As shown in FIG. 9, the light burner unit 320 of the burner 301 includes a right side plate 321 and a left side plate 322 that are substantially rectangular in a side view and are symmetrical to each other. The right side plate 321 includes a light gas mixing passage forming portion 326 formed in the vicinity of the lower end portion of the right side plate 321 so as to bulge substantially parallel to the lower end portion. The light gas mixing passage forming portion 326 is formed in order from the front end side to the rear end side, a convex portion 324 bulging in a convex shape, a concave portion 327 concave in a concave shape, a convex portion 325 bulging in a convex shape, and a concave shape in a concave shape. A recess 329 is provided.

  As shown in FIG. 10, the left side plate 322 is formed with a light gas mixing passage forming portion 356 formed to bulge leftward at a position facing the light gas mixing passage forming portion 326. In the light gas mixing passage forming portion 356, a convex portion 334 is provided at a position facing the convex portion 324 of the light gas mixing passage forming portion 246, and a convex portion 335 is formed at a position facing the convex portion 325. Further, in the light gas mixing passage forming portion 356, a recess 337 is provided at a position facing the recess 327 of the light gas mixing passage forming portion 246, and a recess 339 is formed at a position facing the recess 329. The dimension of the burner 301 (see FIG. 9) in the width direction (left-right direction) is the largest in the portion where the convex portions 324, 325, 334, and 335 are formed.

  A light gas mixing passage 328 is formed in the gap between the light gas mixing passage forming portion 326 and the light gas mixing passage forming portion 356. The light gas mixing passage 328 is formed in the vicinity of the lower end portion of the light burner unit 320 (see FIG. 9) substantially parallel to the lower end portion. As shown in FIG. 10, the flow of the light gas flow path is located in the portion sandwiched between the projections 324 and 334 of the fresh gas mixing passage 328 and the portion sandwiched between the projections 325 and 335. The bulging part which a road cross-sectional area spreads in the left-right direction is each formed. Further, in the portion sandwiched between the concave portion 327 and the concave portion 337 of the light gas mixing passage 328 and the portion sandwiched between the concave portion 329 and the concave portion 339, the narrow cross-sectional area of the light gas passage narrows in the left-right direction. Each part is formed.

  According to the burner 301 of the second modified example, the light gas flows through the light gas mixing passage 328 while repeating the expansion and contraction. The fresh gas flowing through the light gas mixing passage 328 is disturbed in the convex portion 324, the bulging portion sandwiched by the convex portion 334, and the bulging portion sandwiched by the convex portion 325 and the convex portion 335, and in the concave portions 327 and 337. It is disturbed in the narrowed part sandwiched and the narrowed part sandwiched between the concave part 329 and the concave part 339. Therefore, mixing of the light gas can be promoted more reliably.

  Next, a burner 401 that is a third modification of the present embodiment will be described with reference to FIGS. 11 and 12. In the second modified example, convex portions and concave portions are alternately provided on the right side plate 321 and the left side plate 322 of the light burner unit 320, whereas the convex portions and the concave portions are arranged so as to face each other. In the burner 401 of the third modified example, the convex portion and the concave portion are arranged at positions facing each other. Since the burner which is the third modification has a structure substantially similar to that of the first modification described above, the same structural parts are denoted by the same reference numerals as those used in the first modification, and the description will be given. Omitted or simplified.

  As shown in FIG. 11, the light burner unit 420 of the burner 401 includes a right side plate 421 and a left side plate 422 that are substantially rectangular in a side view. The right side plate 421 includes a light gas mixing passage forming portion 426 formed substantially parallel to the lower end portion in the vicinity of the lower end portion of the right side plate 421. The light gas mixing passage forming portion 426 includes a convex portion 424 that protrudes in a convex shape in the right direction slightly forward from the front / rear direction center, and a concave portion recessed in the left direction slightly rearward from the front / rear direction center. 425.

  As shown in FIG. 12, the left side plate 422 is formed with a light gas mixing passage forming portion 436 formed to bulge leftward at a position facing the light gas mixing passage forming portion 426. A light gas mixing passage 428 is formed in the gap between the light gas mixing passage forming portion 426 and the light gas mixing passage forming portion 436. The light gas mixing passage forming portion 436 is provided with a concave portion 434 at a position facing the convex portion 424 of the light gas mixing passage forming portion 426, and a convex portion 435 is formed at a position facing the concave portion 425.

  The protruding dimensions of the convex portions 424 and 435 are the same as each other. The depth dimensions of the recesses 425 and 434 are the same as each other. Further, the projecting dimensions of the convex parts 424 and 435 are larger than the depth dimensions of the concave parts 425 and 434. The dimension of the burner 401 (see FIG. 11) in the width direction (left and right direction) is the largest in the portion where the convex portions 424 and 435 are formed.

  As shown in FIG. 12, when a plurality of burners 401 are used side by side in a burner case, the outer surface of the convex portion 424 of the adjacent burner 401 and the outer surface of the concave portion 434 come into contact with each other, and the convex portion 435. And the outer surface of the recess 425 come into contact with each other. Since the protrusion dimensions of the protrusions 424 and 435 are larger than the depth dimensions of the recesses 425 and 434, the protrusions 424 and 434 and the protrusions 435 and 425 are adjacent to each other between adjacent burners 401 except for the portions where they contact each other. A gap 13 is formed.

  As shown in FIG. 12, according to the burner 401 of the third modified example, the fresh gas flowing through the fresh gas mixing passage 428 is the portion sandwiched between the convex portion 424 and the concave portion 434, the portion sandwiched between the convex portion 435 and the concave portion 425. Circulate via Since the light gas flows while meandering in the light gas mixing passage 428 in the left-right direction, it is possible to substantially lengthen the flow path through which the light gas flows while maintaining the longitudinal dimension of the burner 401. Therefore, the light gas can be stably supplied to the light flame opening of the burner 401, and a stable main flame can be formed at the light flame opening of the burner 401.

  Further, the convex portion 424 and the concave portion 434 are brought into contact with each other, and the convex portion 435 and the concave portion 425 are brought into contact with each other to form the gap 13 between the adjacent burners 401. Therefore, the height dimension of the convex parts 424 and 435 can be the sum of the gap dimension of the gap 13 and the depth dimension of the concave parts 434 and 425. Therefore, an arbitrary value can be determined as the height dimension of the convex portions 424 and 435 while maintaining the gap dimension of the gap 13 between the adjacent burners 401 at an optimum value. In other words, in a combustor in which a plurality of burners 401 are disposed, even if the height dimension of the convex portions 424 and 435 is increased, the depth dimensions of the concave portions 434 and 425 are increased to be adjacent to each other. Since the gap size of the gap 13 between the burners 401 can be maintained, the size of the combustor can be maintained. Therefore, it is possible to provide the burner 401 capable of forming a stable main flame by mixing light gas well while reducing the size of the combustor.

  The present invention is not limited to the above-described embodiment, and various modifications can be made. For example, although the so-called concentration burner has been described in the above-described embodiments and modifications, any burner that mixes and burns primary air and fuel gas may be used, and is not limited to the concentration burner. Moreover, a combustor is not limited to what is mounted in a water heater, For example, you may mount in combustion apparatuses, such as a fryer.

  Further, in the burner 301 of the second modified example, the light gas mixing passage forming portion 326 is provided with a convex portion 324, a concave portion 327, a convex portion 325, and a concave portion 329 in order from the front end side to the rear end side. However, the order of the convex part and the concave part from the front end toward the rear end is not limited to this order. Instead of providing the convex portion 324, the concave portion 327, the convex portion 325, and the concave portion 329 in the light gas mixing passage forming portion 326, the concave portion, the convex portion, the concave portion, and the convex portion are provided in order from the front end side to the rear end side. Also good.

  Further, in the first embodiment described above, the convex portions 24 are formed at positions where the right side plate 21 and the left side plate 22 face each other, but are formed on at least one of the right side plate 21 and the left side plate 22. It only has to be. Furthermore, the shape and number of the convex portions and the concave portions are not limited to the above-described embodiments, and various changes can be made.

DESCRIPTION OF SYMBOLS 1 Burner 20 Light burner unit 21 Right side plate 22 Left side plate 24 Convex part 25 Light gas introduction port 26 Mixing passage 30 Flame port part 40 Burner unit 87 Pale flame port 97 Right rich flame port 98 Left rich flame port 100 Combustor 240 Expansion Outing

Claims (6)

A mixing flow path is formed in the gap between the pair of side walls facing each other while the fuel gas ejected from the gas nozzle and the primary air are mixed and circulated, and the fuel gas and the primary air mixed in the mixing flow path are formed. a mixed gas consisting of, is ejected from the formed flame hole on the upper end by burning, in a burner to be used side by side a plurality in a direction perpendicular to the plane of the side wall,
In a position facing each other at each portion forming the mixing channel of the pair of side walls, a convex portion which bulges convexly outward are respectively formed,
When a plurality of the burners are used side by side in a direction perpendicular to the surface of the side wall, the outer surface of the convex portion comes into contact with the outer surface of the convex portion of another adjacent burner, thereby burner characterized by Rukoto predetermined gap is formed between. 2. The burner according to claim 1 , wherein a plurality of the convex portions are formed on the side wall along the mixing flow path . Recesses that are recessed toward the mixing channel are formed at positions that are opposed to each other in the portions that form the mixing channel of the pair of side walls and that exclude the projections. The burner according to claim 1 or 2. A mixing flow path is formed in the gap between the pair of side walls facing each other while the fuel gas ejected from the gas nozzle and the primary air are mixed and circulated, and the fuel gas and the primary air mixed in the mixing flow path are formed. In a burner that is used by arranging a plurality of mixed gases in a direction orthogonal to the surface of the side wall, to be ejected from a flame mouth formed at the upper end portion and burned.
A convex portion that is formed on a portion of the pair of side walls that forms the mixing channel, and bulges outward.
A portion of the other side wall that forms the mixing channel, and is formed at a position opposite to the convex portion formed on the one side wall;
With
When a plurality of burners are used side by side in a direction perpendicular to the surface of the side wall, the outer surface of the convex portion is in contact with the outer surface of the concave portion of another adjacent burner so that features and to Luba over Na that a predetermined gap is formed. The burner according to claim 4 , wherein a protruding dimension of the convex part is larger than a depth dimension of the concave part . Combustor you, characterized in that the burner according to any one of claims 1 to 5, were arranged plurality in a direction perpendicular to the plane of the side wall.

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