JP5673966B2 - Tint burning burner - Google Patents

Description

  The present invention relates to a concentration combustion burner having a concentration flame hole and an emission flame hole, and in particular, in a concentration combustion burner in which the emission flame holes are arranged on both sides across the concentration flame hole at the center position, the concentration flame at the center position. Improved the mutual assembly structure of the forming member for forming the hole and the pair of forming members for forming the two rows of pale flame holes on both sides, especially the central concentrated flame hole and the both sides sandwiching this The present invention relates to a technique for accurately positioning each pale flame hole at a predetermined relative position while reliably maintaining the predetermined relative positional relationship.

  Conventionally, as a method for manufacturing a gas burner, for example, in Patent Document 1, a predetermined uneven shape is formed on a metal plate by pressing, and the metal plate is folded vertically or horizontally and overlapped. It has been proposed to fix using means such as spot welding. Patent Document 2 proposes forming a flame hole structure by forming a predetermined uneven shape on a metal plate by pressing and then bending the metal plate, and mounting the formed flame hole structure in the combustion tube. ing.

Japanese Patent No. 3177088 Japanese Patent Laid-Open No. 7-127819

  By the way, in order to reduce NOx, a light mixture having an air ratio larger than 1 is burned in the light flame hole, while in order to stabilize the combustion flame, a rich mixture having an air ratio smaller than 1 is burned. A concentration burning burner has been proposed in which a concentration flame hole for burning is adjoined to the emission flame hole. Also in such a method for manufacturing a light and dark combustion burner, a light and dark combustion burner having a flat overall shape is obtained by joining or welding together various forming members formed into a predetermined shape by press forming or the like. Is considered to form.

  In the present applicant, as shown in FIG. 21 as an example, for example, each of three types of a pair of plate members 400, 400, 500, 500, 600, 600 and a pair of flame hole forming members 700, 700 are provided. Used, by joining the pair of plate members 6 and 6 facing each other, joining the plate member 400 with the flame hole forming member 700 sandwiched between both sides, and further joining the plate member 500 to both outsides, Development of a light and dark combustion burner with a flat configuration as a whole. In this case, a row of central concentrated flame holes is formed on the upper end surfaces of the pair of central plate members 600, 600, and the rich air-fuel mixture is supplied from between the opposing surfaces. Pale flame holes are formed by the flame hole forming member between the members 400, and a deep flame hole is formed on the upper end surface of each plate member 400 and the outer plate member 500, and so on. In the width direction, the deep flame holes and the pale flame holes are alternately arranged in an arrangement of dark-light-dark-light-dark.

  In this case, in order to form two rows of pale flame holes sandwiching the central dense flame hole, it is necessary to assemble the pale flame hole forming members on both sides of the central dense flame hole. Due to the accumulation of position errors, the relative positions with respect to the vertical direction and the longitudinal direction may deviate from those originally designed. If the mutual positional relationship between the rich flame hole and the pale flame hole shifts, the flame holding property may be impaired, and problems such as vibration combustion may occur. Moreover, not only the accuracy of the relative positions of the rich flame hole and the pale flame hole, but also misalignment due to, for example, repetition of the combustion state and the non-combustion state, or a change in the combustion state due to a change in capacity. In addition, an integral holding function of an accurate relative position is also required without causing the above.

  The present invention has been made in view of such circumstances, and the object of the present invention is to provide a concentration combustion burner in which each of the light flame holes is formed on both sides across the center flame flame hole, or In the concentration burning burner in which the concentration flame holes are formed outside both the emission flame holes, particularly, the central concentration flame hole and the emission flame holes on both sides can be accurately positioned at predetermined relative positions when assembled. Another object is to provide a light and dark combustion burner that can reliably maintain a predetermined relative positional relationship during use.

In order to achieve the above object, a concentrated flame hole forming body for forming a central concentrated flame hole arranged so as to extend in the longitudinal direction at a central position in the lateral direction, and the central concentrated flame hole from both sides in the lateral direction A pale flame hole forming body for forming two rows of pale flame holes arranged so as to be sandwiched, and the dense flame hole forming body and the pale flame hole forming body are formed into a predetermined shape by press molding. A single-piece plate-shaped molding material is bent and formed as an integral component, and the plate-shaped molding material is a first molding portion for forming the dense flame hole-forming body, and the light flame. A pair of second molding portions for forming the hole forming body are connected to each other via a bent portion . In addition, an outer plate member having an upper end opened and having a predetermined gap defined between the opposing surfaces in the short-side direction is provided, and the integrated structure has an upper end relative to the opposing surfaces of the outer plate member. It was made to assemble | attach by being inserted from opening (Claim 1).

In the case of the present invention, it is possible to form an integral structure simply by pressing a single plate-shaped molding material, and the dense flame hole forming body and the light flame hole forming body are separately divided and pressed. Compared with the case of forming the mold, the number of molds can be greatly reduced, the processing effort and the cost can be reduced. In addition, compared with the case where the deep flame hole forming body and the pale flame hole forming body are formed separately and assembled to each other, the assembly man-hours can be greatly reduced. On top of that, since the rich flame hole forming body and the pale flame hole forming body are formed as an integral structure, the relative position between the rich flame hole forming body and the pale flame hole forming body is fixed. In addition, the effort required for relative positioning and the conventionally required measures such as holding the relative position are unnecessary or alleviated and can be reliably held at a predetermined relative position. Moreover, in particular a high temperature state due to the combustion, disadvantages of positional shift of concentrated fire hole forming member and a light flame hole formation member repeating the state in which the cold due to stop combustion also that obtained easily eliminated. In addition, an outer plate member having an upper end opened and a predetermined gap defined between the opposing surfaces in the short direction is provided, and as an integrated structure, an upper end opening is provided between the opposing surfaces of the outer plate member. As a result, it is possible to construct a light and dark combustion burner using the outer plate member as the main body casing. On top of that, it is possible to assemble by simply inserting the integrated structure from the upper end opening of the outer plate member.

  As the plate-shaped molding material in the light and dark combustion burner of the present invention, the first molded portion and the second molded portion are formed so as to be connected to each other via one or two or more strip-shaped bridging portions, The bridging portion includes a portion corresponding to a hole edge of a central rich flame hole formed on the upper end surface of the dense flame hole forming body, and a hole edge of the pale flame hole formed on the upper end surface of the pale flame hole forming body. And a short side on one or both of the side surface of the dense flame hole forming body and the side surface of the pale flame hole forming body opposite to the dense flame hole forming body. The convex part which protrudes in a direction and positions the short direction relative position between both sides | surfaces can be formed (Claim 2). By doing so, the dense flame hole opened on the upper end surface and the pale flame hole opened on both sides of the dense flame hole are surely arranged at a predetermined relative position by the bridging portion, and the dense flame is formed by forming the convex portion. The relative position in the short direction between the hole and the pale flame hole is also reliably held at a predetermined value, and a gap of a predetermined dimension can be easily secured between them.

Furthermore, it is possible to form the monolithic combustion burner according to the present invention using a material having a thicker plate thickness than the outer plate member (claim 3 ). By doing in this way, even if the rich flame hole of the rich flame hole formation body is heated to high heat by combustion, the durability can be ensured.

As described above, according to the light and dark combustion burner of the present invention, the thick flame hole forming body and the light flame hole forming body are configured as a single body by simply pressing one plate-shaped molding material. A unitary structure can be formed. As a result, compared with the case where the deep flame hole forming body and the light flame hole forming body are separately formed by press processing, the number of molds can be greatly reduced, and the labor and cost of processing can be reduced. It becomes like this. Further, compared to the case where the dense flame hole forming body and the pale flame hole forming body are separately formed and assembled to each other, the number of assembling steps can be greatly reduced. On top of that, since the rich flame hole forming body and the pale flame hole forming body are formed as an integral structure, the relative position between the rich flame hole forming body and the pale flame hole forming body is fixed. Therefore, it is possible to eliminate or alleviate the trouble of relative positioning and the conventionally required measures such as maintaining the relative position, and it is possible to reliably hold at a predetermined relative position. Moreover, in particular a high temperature state due to combustion, it Contact misalignment occurrence of concentrated fire hole forming member and a light flame hole formation member repeating the state in which the cold due to stop combustion even Ru can be easily eliminated is. In addition, an outer plate member having an upper end opened and having a predetermined gap defined between the opposing surfaces in the lateral direction is provided, and as the integrated structure, between the opposing surfaces of the outer plate member By being assembled by being inserted from the upper end opening, it is possible to configure a light and dark combustion burner with the outer plate member as the main body casing, and further, from the upper end opening of the outer plate member. It is possible to assemble by simply inserting the components.

  In particular, according to claim 2, as the plate-shaped molding material, the first molded portion and the second molded portion are formed so as to be connected to each other via one or two or more strip-shaped bridging portions. And the bridging portion is formed at a portion corresponding to a hole edge of the central rich flame hole formed on the upper end surface of the rich flame hole forming body, and a pale flame hole formed on the upper end surface of the pale flame hole forming body. It arrange | positions so that it may connect between the site | parts corresponding to a hole edge, and on either or both of the side surface of the said rich flame hole formation body, and the side surface of the said pale flame hole formation body which opposes this, By forming a convex portion that protrudes in the short direction and positions the relative position in the short direction between both side surfaces, the rich flame hole that opens on the upper end surface and the pale flame hole that opens on both sides thereof are bridged. Can be surely placed at a predetermined relative position, and by forming the convex portion, the relative position in the short direction between the rich flame hole and the pale flame hole Can be reliably held at a predetermined one, it is possible to also easily performed to ensure a clearance of a predetermined size therebetween.

Furthermore, according to the third aspect , the thick flame hole of the dense flame hole forming body is heated by combustion by forming the integral structure using a material thicker than the outer plate member. Even if heated, the durability can be ensured.

The example of the combustion apparatus incorporating the light and dark combustion burner of this invention is shown, FIG. 1 (a) is explanatory drawing shown in a perspective view state, FIG.1 (b) is explanatory drawing shown in a sectional view state. It is a perspective view of the light and dark combustion burner of the embodiment of the present invention. 3A is a plan view of the burner of FIG. 2, and FIG. 3B is an enlarged view of the FF portion of FIG. 3A. The first plate member constituting the light burner portion, the second plate member constituting the outer dark burner portion, the third plate member constituting the central dark burner portion, and the light disposed on both sides of the central dark burner portion It is a disassembled perspective view which shows the integral structure of the flame hole formation member which comprises a flame hole row | line | column in the decomposed | disassembled state. It is a reference figure shown in an exploded state about the procedure which inserts the integral composition consisting of a flame hole formation member and the 3rd plate member into the opening between the 2nd plate members. It is an enlarged view of the G section of FIG. It is an enlarged view which abbreviate | omits and shows a pair of flame hole formation member about the integrated structure of FIG. It is a perspective view of the state cut | disconnected by the AA line of FIG. It is a front view of the state cut | disconnected by the AA line of FIG. It is a fragmentary perspective view of the light and dark combustion burner when it cut | disconnects in the position corresponding to the BB line of FIG. It is a fragmentary perspective view of the light and dark combustion burner when it cut | disconnects in the position corresponding to CC line of FIG. It is a fragmentary perspective view of the light and dark combustion burner when it cut | disconnects in the position corresponding to the DD line | wire of FIG. FIG. 10 is a partially enlarged cross-sectional explanatory view in a state cut along a line EE in FIG. 9. FIG. 10 is an enlarged cross-sectional explanatory view of the light and dark combustion burner when cut at a position corresponding to the line BB in FIG. 9. FIG. 6 is a plan view of a press-formed product made of a single metal plate material used for assembling the integrated structure of FIG. 5. FIG. 16 is a reference diagram illustrating a procedure until the integrated structure of FIG. 5 is manufactured by bending the press-processed product of FIG. 15 from the state of arrows HH in FIG. It is a perspective view which shows the state of the bending process of the 1st step of FIG. FIG. 6 is a partially enlarged cross-sectional explanatory diagram in a state in which the integrated structure is assembled along the line II in FIG. 5. FIG. 6 is a partially enlarged cross-sectional explanatory view showing a state in which the integrated structure in the line JJ of FIG. 5 is assembled. FIG. 6 is a partially enlarged cross-sectional explanatory view in a state in which an integrated structure is assembled in the KK line of FIG. 5. It is a disassembled perspective view which shows the example of the manufacturing method contrasted with this invention.

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

  FIG. 1 shows a combustion apparatus 2 to which a light and dark combustion burner according to an embodiment of the present invention is applied. This combustion apparatus 2 has a fixed burner set in a state where a predetermined number of light and dark combustion burners 3, 3,. The upper space of the can 21 is a combustion space 22, and combustion air from the blower fan 24 is supplied to the lower space 23, while a gas manifold 25 (see FIG. 1B) is provided on one side of each of the light and dark combustion burners 3. 2), and two gas nozzles 26, 27 protrude from the gas manifold 25 for each of the light and dark combustion burners 3. One (lower) gas nozzle 26 is directed toward the first supply port 31 of the concentration combustion burner 3, and the other (upper) gas nozzle 27 is injected toward the second supply port 32 of the concentration combustion burner 3. To get. Then, the air from the lower space 23 is pushed in from the surroundings of the gas nozzles 26 and 27 by the discharge pressure of the blower fan 24 so that both the fuel gas and the air can be supplied to the first and second supply ports 31 and 32. It has become. At this time, the first supply port 31 is set to have a considerably larger diameter than the second supply port 32, and more air is pushed in, while the second supply port 32 is set to a relatively small diameter, The amount of air to be pushed in is reduced. In this way, in addition to the fuel gas supplied from the first supply port 31, an amount of air having a predetermined air ratio larger than 1.0 times the amount of the fuel gas is supplied to the inside. On the other hand, in addition to the fuel gas similarly supplied from the second supply port 32, an amount of air having a predetermined air ratio smaller than 1.0 times the amount of the fuel gas is supplied to the inside. It has become. A large number of small holes are formed in the rectifying plate 28 (see FIG. 1B) arranged so as to partition the lower space 23 and the light and dark combustion burners 3, 3,... Secondary air is supplied between the light and dark combustion burners 3 and 3.

  As shown in FIG. 2, the light and dark combustion burner 3 is processed into a predetermined shape by pressing and bending using a metal plate material. That is, the concentration burner 3 includes a central concentration burner portion 3a composed of one row of rich flame hole rows 33, a light burner portion 3b composed of two rows of pale flame hole rows 34, 34, and two rows of rich flame hole rows. The outer thick burner portion 3c made of 35, 35 is formed in a flat shape as a whole, and these are three types of plate members 4, 4, 5, 5, 6 and a flame hole forming member 7. It is formed using. If the up-down direction in FIG. 3 is the longitudinal direction (front-rear direction) and the left-right direction in FIG. 3 is the short direction (width direction), the first supply port is located at the lower position on one side in the longitudinal direction (left side in FIG. 2). 31 is opened, a second supply port 32 having a smaller diameter than the first supply port 31 is opened at the upper position, and a plurality of flame hole arrays in which a combustion flame is formed on the upper end surface is formed in the longitudinal direction as shown in FIG. It is formed to extend. As the flame hole array, as shown in FIGS. 3A and 3B, a narrow flame hole array 33 having a narrow width extends in the longitudinal direction at the central position in the short direction, and this dense flame hole array 33 is formed. A relatively wide pale flame hole row 34 extends in the entire length in the longitudinal direction at each of both sides in the short direction, and a narrow deep flame hole row 35 is located at the outer side of the pale flame hole rows 34, 34 on both sides. It extends in the entire direction. Then, the light flame mixture supplied and mixed from the first supply port 31 (see FIG. 2) is guided to each of the pale flame holes 341 of the pale flame hole rows 34 and 34, and the pale flame is caused by each of the pale flames. A second supply port 32 (FIG. 2) is formed in each of the concentrated flame holes 331 of the concentrated flame hole array 33 at the center position and each of the concentrated flame hole arrays 351 of the two concentrated flame hole arrays 35, 35 at both outer positions. The rich mixture supplied and mixed from the reference is introduced, and a rich flame is formed by each of the rich mixtures.

  Such a light and dark combustion burner 3 can be formed as follows, for example. That is, as shown in FIG. 4, the first plate members 4, 4 that form the main casing of the light burner portion 3 b are joined to each other in an opposed state, and both outer sides with respect to the first plate members 4, 4. Second plate members 5 and 5 which are covered from above to form an outer dark burner portion 3c which will be described later, and an integrated structure 8 which is inserted from the upper end opening of the first plate members 4 and 4 and is mounted and fixed inside. Constructed using. The integral structure 8 (see also FIGS. 5 and 6) includes a third plate member 6 constituting a later-described central dark burner portion 3a and a pair of flame holes each forming a later-described pale flame hole array 34. The forming portions 71, 71 are constituted by a flame hole forming member 7 integrally connected to the third plate member 6 by at least a pair of bridging portions 72, 72 (two pairs in the illustrated example). Each flame hole forming portion 71 constitutes a pale flame hole forming body. The third plate member 7 and the flame hole forming member 7 constituting the integrated structure 8 are thicker than the other first plate members 4 and 4 and second plate members 5 and 5. (Plate material). If the first plate members 4 and 4 and the second plate members 5 and 5 are made of a material having a thickness of 0.3 mm, for example, the integrated structure 8 is made of a material having a thickness of 0.4 mm, for example. By doing so, protection of the vicinity of the central concentrated flame hole array 33 that is most distant from the secondary air supplied from the lower space 23 through the rectifying plate 28 (see FIG. 1B) and tends to be hot due to combustion is achieved. I am doing so.

  As shown in FIG. 7, the third plate member 6 is configured such that the plate portion 65 on one side and the plate portion 65 on the other side face each other inwardly with the lower end portions 60 a and 60 b as folding lines. The rear end edges 651 and 651 and the front end edges 652 and 652 are brought into close contact with each other. Accordingly, the plate portions 65 and 65 on both sides are opposed to each other at a predetermined narrow interval, and a rich gas mixture supply passage is formed between the inner surfaces of the plate portions 65 and 65, thereby forming the rich flame hole 331 constituting the rich flame hole row 33 on the upper end surface. 331, ... are communicated. A first communication hole 61 is formed through the plate portions 65 and 65 on both sides at the lower end 60a at the front end side position, and a notch recess 60c is formed at the rear side position of the first communication hole 61. Yes. Further, first bulging portions 654 bulging outward in the lateral direction are formed on both sides in the lateral direction at the lower side of the dense flame hole row 33 so as to extend in the entire length in the longitudinal direction. Fitting projections 655 and 655 projecting outward in the lateral direction from the intermediate positions in the vertical direction of the portion 654 and the dense flame hole array 33 are formed at positions separated in the longitudinal direction. In this way, the central dark burner portion 3a is formed by the third plate member 6, and the deep flame hole forming body is formed. In addition, the second bulges bulging inward in the lateral direction from the vertical position similar to the bulging portion 654 are respectively formed on the short side facing surfaces of the upper positions of the first plate members 4 and 4. The protruding portion 44 is formed to extend the entire length in the longitudinal direction.

  An integrated structure 8 composed of the central dark burner 3a (third plate member 6) and the flame hole forming member 7 (see FIGS. 4 and 5) extends downward from the upper end opening 44 between the pair of first plate members 4 and 4. By being inserted and fixed inside, the central dark burner portion 3a is arranged at the center position between the opposing sides of the pair of first plate members 4, 4 in the short direction (see FIG. 2 or FIG. 3), The pair of flame hole forming portions 71, 71 constituting the flame hole forming member 7 is assembled in a state of surrounding the rich flame hole row 33 of the central dark burner portion 3a from both sides in the short direction. Each of the flame hole forming portions 71 forms the pale flame hole row 34, and the pale burner portion 3b is formed by the two rows of the pale flame hole rows 34 and 34. The first plate member 4 constitutes a plate member for partitioning the pale flame hole row 34 and the outer rich flame hole row 35 from each other. The central deep burner portion 3a and the flame hole forming member 7 assembled to the first plate members 4 and 4 are fixed as follows. That is, a predetermined interval is provided between the longitudinal side edges 42, 42, 43, 43 (see also FIGS. 3A and 3B) of the first plate members 4, 4 (see FIG. 5). A slit portion is formed. By pushing the rear end edges 651 and 651 and the front end edges 652 and 652 of the central dark burner portion 3a into the slit portion from above, the rear end edges 651 and 651 The front edge 652, 652 is sandwiched between the side edges 42, 42, 43, 43, and the third plate member 6 constituting the central dark burner portion 3a is fixed to the first plate members 4, 4. It has come to be. The rear end edges 651 and 651 and the side edges 42 and 42 sandwiched between the side edges 42 and 42 are welded (for example, spot welding), or the front end edges 652 and 652 are connected to the side edges. 43 and 43 may be welded or reinforced. Thus, since the third plate member 6 is fixed to the first plate members 4 and 4 and the flame hole forming member 7 is integrally assembled with the third plate member 6, the flame hole forming member 7 is also the first one. The three plate member 6 and the first plate members 4 and 4 are assembled together. Details of the manufacturing method of the integrated structure 8 and the mutual structure of the flame hole forming member 7 and the third plate member 6 will be described later.

  The second plate members 5 and 5 are placed on the outside of the first plate members 4 and 4 (see, for example, FIG. 4), and the outer dense flame hole rows 35 and 35 (see FIG. 3) are formed on the upper end side. In addition, a supply passage through which the rich air-fuel mixture is supplied to each thick flame hole row 35 is defined between the inner surface of each second plate member 5 and the outer surface of the first plate member 4 facing each other. The outer dark burner portion 3c (see FIGS. 2 and 3) is formed.

  Next, the supply structure portion of the light mixture and the rich mixture will be described with reference to FIGS. 8 and 9, the hatched portions are meshed surfaces that are brought into close contact with each other by intimate contact or pressure welding, and in addition, linear welding, spot welding, or the like is added, and the contact state is maintained. Maintained. In the light burner portion 3b, the fuel gas and air supplied from the first supply port 31 opened to one side are mixed in the cylindrical portion 36 to become a light mixture, and this light mixture is the cylindrical portion 36 ( The space between the pair of first plate members 4 and 4 is sent to the other side through the other side (refer to the dotted arrow in FIG. 12). Is supplied to each of the light flame hole rows 34 at the upper end through the two internal spaces 37, 37 partitioned (divided) by the lower end portion 60b of the third plate member 6. The cylinder portion 36 and the internal spaces 37, 37 constitute a light mixture supply passage for supplying the light mixture to the two rows of the thin flame hole rows 34, 34, and the cylinder portion 36 has a first supply port 31. It also serves as a mixing chamber and an introduction passage (a light mixture introduction passage) for fuel gas and air supplied from the air. The third plate member 6 constitutes a forming member for partitioning and forming a first rich mixture supply passage, which will be described later, and the third plate member 6 bisects the downstream side of the light mixture introduction passage (2 The two fresh air-fuel mixture supply passages (internal spaces 37, 37) are partitioned.

  As for the rich air-fuel mixture, the fuel gas and air supplied to the second supply port 32 on the upstream end side are mixed in the cylinder portion 38 to become a rich air-fuel mixture. The mixture is further mixed while being led to the back (rear) closed end 381 side which is the downstream end side through (see also FIG. 13). The rich air-fuel mixture is supplied to each of the central dark burner portion 3a and the left and right outer dark burner portions 3c (see FIG. 10 or FIG. 11). That is, the lower end portion 60a on the front end side of the central dark burner portion 3a is inserted into the cylinder portion 38 from above and floats in a state of floating in the cylinder portion 38 (see also FIG. 10 or FIG. 14). The first communication holes 61, 61 are opened at positions above the mixing chamber (upper position), which is the internal space of the cylindrical portion 38, in the protruding portion (lower end portion 60 a). And the inner space 62 of the central dark burner portion 3a communicate with each other. As a result, the rich air-fuel mixture in the cylinder portion 38 is supplied to the rich flame hole row 33 through the first communication holes 61 and 61 and the internal space 62.

  In addition, at a position downstream of the opening positions of the first communication holes 61 and 61 (on the closed end 381 side), the pair of first plate members 4 and 4 constituting the cylindrical portion 38 are connected to the second and third pairs. The communication holes 41 and 41 (see also FIG. 11 or FIG. 13) are formed through, and the mixing chamber in the cylinder portion 38 is formed by the second communication hole 41 on one side (the right side in FIG. 11 and the upper side in FIG. 13). Is communicated with the internal space 51 between the first plate member 4 on the one side and the second plate member 5 on the same side, and is connected to the third communication hole 41 on the other side (left side in FIG. 11, lower side in FIG. 13). The mixing chamber in the tubular portion 38 is communicated with the internal space 52 between the first plate member 4 on the other side and the second plate member 5 on the same side. As a result, the rich air-fuel mixture in the cylinder portion 38 is supplied to the rich flame hole array 35 on one side through the second communication hole 41 and the internal space 51, while the rich air-fuel mixture in the cylinder portion 38 is similarly supplied to the other side. The concentrated flame hole array 35 on the other side is supplied through the third communication hole 41 and the internal space 52. In addition, the second communication hole 41 and the third communication hole 41 are set so as to open opposite to each other in the short direction at a position facing the notch recess 60c (see FIG. 9) of the third plate member 6. The pair of second and third communication holes 41 and 41 are configured to open to face each other through a space in the cylindrical portion 38 that does not block anything in the short direction (width direction) (see FIG. 11 or FIG. 13).

  In addition, the said cylinder part 38 comprises the mixing chamber for mixing the fuel gas and air which are supplied from the 2nd supply port 32, and the rich mixture introduction channel | path for introducing the mixed concentrated mixture On the other hand, the internal spaces 51, 62, 52 also serve to form a rich mixture supply passage for supplying the rich mixture to the corresponding rich flame hole rows 35, 33, 35. . That is, the internal space 51 that communicates with the second communication hole 41 constitutes the second rich mixture supply passage, and the internal space 52 that communicates with the third communication hole 41 constitutes the third rich mixture supply passage. The internal space 62 communicating with the holes 61, 61 constitutes a first rich mixture supply passage.

  Next, a manufacturing method of the integrated structure 8 shown in FIG. 4 or 5 will be described with reference to FIG. The unitary structure 8 is formed by forming a predetermined uneven shape by press molding on a single metal plate material and cutting the plate-shaped molding material 8a in an unfolded state and bending it into an accordion shape. A unitary structure 8 is formed. The plate-shaped molding material 8a includes a first molding section 6a in a state in which the plate sections 65 and 65 are developed in line symmetry with a center folding line T interposed therebetween, and a pair of second molding sections that respectively become the flame hole forming sections 71. 71a, 71a, and each second molding portion 71a is connected to the first molding portion 6a via a strip-shaped bridging portion 72, 72, and is symmetrical with respect to the folding line T. It is formed in the state of one sheet unfolded. When the plate portions 65 and 65 on both sides are folded inwardly with the fold line T as the center, the fold portions along the fold line T become lower end portions 60a and 60b (see FIG. 5), which are substantially the same. The diamond-shaped notch opening 601 becomes the notch recess 60c, and the rear end edges 651 and 651 and the front end edges 652 and 652 are in close contact with each other. The plate-shaped forming material 8a is made of a thick metal plate material that is thicker than the first plate member 4 and the second plate member 5 as described above.

  The second molding portion 71a includes at least two strip plate-like rectifying plates 76a, 76b, 76c, and 76d each having a predetermined concavo-convex shape by narrow strip-shaped connecting portions 77, 78, and 79. Molded to be connected together. The connecting portions 77, 78, and 79 may each be an appropriate number of 1 or more, but it is preferable that each of the connecting portions 77, 78, and 79 is 2 or more in consideration of the accuracy of the bending direction in the bending process described later. And it folds in an accordion shape at predetermined fold lines b1, b2, b3, and b4 set in parallel to each other from the bridging portions 72 and 72 to the respective molding portions 71a, and adjacent strip-shaped rectifying plates 76a and 76b. , 76b, 76c, 76c, and 76d are joined together to form the flame hole forming member 7 that is connected to the third plate member 6 by the bridging portions 72, 72, 72, 72.

  The above-described plate-shaped forming material 8a may be bent as follows. As shown in FIG. 16, first, the second molding parts 71a and 71a at both sides are bent to form a pair of flame hole forming parts 71 and 71, and then the first molding part 6a is bent and the third plate part 6 is bent. Finally, a predetermined part is pressed and joined from both sides in the short direction. First, in each of the second forming portions 71a, the folds are alternately bent in an accordion shape at the positions of the fold lines b1, b2, b3, and b4 (see P1, P2, P3 and FIG. 17 in the same figure), and adjacent belt-shaped rectifying plates 76a. , 76b, 76b, 76c, 76c, 76d are joined together to form the flame hole forming portion 71. Here, FIG. 17 shows the situation of the second forming portion bending process P2 of FIG. Thereafter, the flame hole forming portions 71 and 71 on both sides are respectively bent at the position of the bridging portion 72 and arranged at positions closer to the outer surface of each plate portion 65. Then, after folding the plate portions 65 and 65 on both sides around the fold line T so as to face each other inward (see P4 and P5 in FIG. 16), the lower end portions 60a and 60b are short. By pressing from both sides in the direction, the rear end edges 651 and 651 and the front end edges 652 and 652 are brought into close contact with each other, and the both sides of the flame hole forming portions 71 and 71 are also pressed from both sides in the short direction. Thus, each flame hole forming portion 71 is brought into close contact with the outer surface of the third plate member 6. Thus, the formation of the integrated structure 8 is completed. The close contact of the inner surface of each flame hole forming portion 71 with the outer surface of the third plate member 6 is also ensured by a process of inserting the integrated structure 8 between the pair of second plate members 4 and 4 as will be described later. Will be.

  In the state in which the integrated structure 8 is formed as described above and is then inserted between the pair of second plate members 4 and 4 as shown in FIGS. That is, the flame hole forming portions 71 are supported in a state where the flame hole forming portions 71 are connected via the bridging portions 72 to both sides in the short direction of the third plate member 6 (see FIG. 18) constituting the central dark burner portion 3a. Will be. Each flame hole forming portion 71 has the connecting portion 77 bent at the intermediate position and brought into close contact with each other so that the belt-like rectifying plates 76c and 76d are joined together, and the connecting portion 78 is bent at the intermediate position and brought into close contact with each other. The plates 76b and 76c are joined to each other, and the connecting portion 79 is bent at the intermediate position and brought into close contact with each other, whereby the strip-like rectifying plates 76a and 76b are joined to each other. Since the third plate member 6 is fixed to the second plate members 4 and 4 as described above, the flame hole forming member 7 is also fixed via the third plate member 6. On the other hand, in the integrated structure 8, the inner surfaces 711 of the flame hole forming portions 71 and 71 are in close contact with the first bulging portion 654 above the central dark burner portion 3a formed by the third plate member 6, while The outer surfaces 710 of the flame hole forming portions 71, 71 are in close contact with the inner surfaces of the second bulging portions 44, 44 above the first plate members 4, 4, so that the air-fuel mixture does not pass upward between them. It becomes a sealed state. Along with this, the pair of flame hole forming portions 71, 71 are reliably positioned at symmetrical positions with respect to the short direction across the third plate member 6, so that the third plate member 6 and the first plate members 4, 4 On the other hand, it is securely assembled at a predetermined short-side position. It should be noted that due to the presence of the metal-sealed bulging portions 44, 654, 654, 44, there is a light flame formed in each light flame hole array 34 (see, for example, FIG. 14), and a central rich flame sandwiching the light flame. Between the rich flames formed in the hole row 33 and the outer dense flame hole 35, the length of the bulging portions 44, 654, 654, 44 corresponding to the width of a short width corresponding to the bulging amount of each bulging portion 44 is long. A non-spout zone 39, 40, 40, 39 of the air-fuel mixture extending in the entire length in the direction is formed.

  Further, it is formed to protrude from the engaging convex portions 73 projecting from the outer surfaces 710 and 710 on both sides of the pair of flame hole forming portions 71 and 71 (see FIG. 19) and from the inner surfaces 711 and 711 on opposite sides. The engaging projection 74 is used to position the flame hole forming member 7 in the vertical direction with respect to the third plate member 6 and the second plate members 4 and 4, and the flame hole forming member 7 is connected to the third plate member 6 and the second plate member 4. , 4 with the relative position in the vertical direction being maintained in a state where the positional deviation is prevented downward. That is, the engagement convex portions 73 and 73 are formed so as to protrude to both outer sides in the short direction at one or more positions (two in the illustrated example) in the longitudinal direction with respect to each outer surface 710, Similarly, one or more positions (two positions corresponding to the engagement protrusion 73 in the illustrated example) are formed so that the engagement protrusions 74 and 74 protrude to opposite sides in the short direction. Further, the outer engaging convex portion 73 is a concave step portion on the upper side of the bulging portion 44 of the second plate member 4, and the inner engaging convex portion 74 is a concave portion on the upper side of the bulging portion 654 of the third plate member 6. The stepped portions are brought into contact with and engaged with each other, and further downward relative movement of the flame hole forming member 7 is prevented. Furthermore, fitting convex portions 655 and 655 (FIG. 3A) formed on the upper side positions of the first bulging portions 654 and 654 at the both lateral positions of the third plate member 6 (see FIG. 20). Is in a state of being fitted from the short direction into the recessed step portions at the bottom of the recessed grooves 75 and 75 formed in the opposed inner surfaces 711 and 711 of the flame hole forming portions 71 and 71, respectively. .

  In the case of the above-described concentration burner 3, the following basic effects can be obtained. That is, since each of the two pale flame hole rows 34, 34 is sandwiched from both sides by the rich flame hole rows 35, 33 or the rich flame hole rows 33, 35, it is formed in both pale flame hole rows 34, 34. Each of the light flames can be surrounded by a thick flame from both sides. That is, the flame structure in the short direction can be arranged in the order of rich flame-light flame-rich flame-light flame-rich flame. As a result, even if the number of the light flame hole rows 34 is increased to increase the area of the light flame hole rows, the combustion of the combustion chamber 22 (see FIG. 1) is avoided while avoiding an increase in the flame length of the light flame. The chamber height can be kept low, while the combustion chamber height can be kept low, and the area (ratio) of the flare holes can be increased to further reduce NOx, and combustion can be further stabilized. Can be planned. In addition, compared with a case where one burner hole row is sandwiched between the dense flame hole rows from both sides to form one burner, the burner can be made more lightweight in terms of realizing the same pale flame hole area. become. Further, the rich air-fuel mixture introduced and mixed into the cylindrical portion 38 from one fuel gas and air supply port (second supply port 32) is communicated with the closed end side region of the cylindrical portion 38 and opened. Corresponding interior through the first communication holes 61, 61 of the central dark burner portion 3a, the second communication hole 41 of the outer dark burner portion 35 on one side, or the third communication hole 41 of the outer dark burner 35 on the other side. It is possible to divert (branch supply) the spaces 62, 51, 52. Thereby, even when three rich flame hole rows 35, 33, 35 are formed at the center and both outer sides, the rich mixture is smoothly and surely diverted with a simple structure so that each of the rich flame hole rows 35 is formed. , 33, 35. As described above, the central thick burner portion 3a is realized by a relatively thin thickness in the short direction, and is compact as a light and dark combustion burner that realizes an arrangement of rich flame-light flame-dark flame-light flame-rich flame. It can be realized with.

  Further, a first molding portion 6a for forming the third plate member 6 constituting the central dark burner portion 3a and a second for forming the pair of flame hole forming portions 71, 71 disposed on both outer sides thereof. Since the integrated structure 8 is formed by using the single plate-shaped molding material 8a that is continuous with the forming portions 71a and 71a through the bridging portion 72, the central concentrated flame of the central concentrated burner portion 3a is formed. It is possible to accurately position the relative position in the short direction, the longitudinal direction, and the vertical direction between the hole row 33 and the pale flame hole rows 34, 34 of the light burner portion 3b, and the predetermined relative position is determined. It can be reliably maintained. That is, since each flame hole forming portion 71 is assembled in close contact with the first bulging portion 654 of the third plate member 6 while being connected via the bridging portion 72, in addition to the longitudinal direction, The relative positioning in the short direction is easily performed and can be reliably maintained. Further, the integral connection by the bridging portion 72 enables easy and reliable relative positioning and maintenance in the vertical direction. Further, in addition to the integral connection by the bridging portion 72, the presence of the engagement convex portions 73 and 74 and the fitting convex portion 655 can further reliably maintain the relative position. Thereby, for example, due to the repetition of the combustion state and the non-combustion state, the change in the combustion state accompanying the change in capacity, and the like, the flame hole forming member 7 is relatively upward in relation to the central burner portion 3a. Even if a force to lift is applied, each flame hole forming portion 71 can be held at a predetermined relative position so as not to escape upward. In addition, the integrated structure 8 can be formed simply by pressing a single plate-shaped molding material 8a, and a plurality of (for example, portions corresponding to the third plate member 6 and each flame hole forming portion 71). Compared to the case of separate press forming, the number of dies can be greatly reduced, and the labor and cost of processing can be reduced. In addition, for example, the number of assembling steps can be greatly reduced as compared with the case where the third plate member 6 and each flame hole forming portion 71 are formed for each portion.

<Other embodiments>
The integrated structure 8 according to the present embodiment includes at least a central rich flame hole row 33 made up of central rich flame holes 331 and a pair of pale flame hole rows 34 made up of pale flame holes 341 sandwiching this from both sides in the short direction, 34 is applicable.

  Instead of the first bulging portion 654 and the second bulging portion 44, the third plate member 6 and each flame are formed by forming projecting convex portions protruding in the short direction from positions separated from each other in the longitudinal direction. You may make it position and hold | maintain the relative position of the transversal direction between the hole formation parts 71. FIG. In addition, the bulging portions 654 and 44 may be formed only in a part in the longitudinal direction with the same purpose as the convex portion. As a specific example of the convex portion, instead of the first bulging portion 654, a convex portion may be formed so as to protrude from the inner surface 711 of the flame hole forming portion 71 toward the third plate member 6, or Instead of the two bulging portions 44, a convex portion may be formed so as to protrude from the outer surface 710 of the flame hole forming portion 71 to the second plate member 4 side. The above convex part and the above-mentioned bulging part 654 constitute a convex part that protrudes from one or both of the third plate member 6 and the flame hole forming part 71 and positions the relative position in the short direction.

  As the plate-shaped forming material 8a for forming the integrated structure 8, the first forming portion 6a is made of a thick plate material (for example, 0.4 mm) (metal plate material), and the second forming portions 71a and 71a. Can be formed using a thin plate material (for example, 0.3 mm) (metal plate material). In this case, with the bridging portions 72, 72, 72, 72 as boundaries, the first molding portion 6a side is a thick metal plate material, and the second molding portion 71a side is a thin metal plate material. Laser welding is performed along the boundary line of the material, and the welding trace is smoothly cut to obtain a single metal plate material, which is then subjected to press forming to form the plate-shaped material 8a.

4 First plate member (outer plate member)
6 Third plate member (rich flame hole forming body)
6a 1st shaping | molding part 8 Integrated structure 8a Plate-shaped shaping | molding raw material 33 Center rich flame hole row | line | column (central rich flame hole)
34 Pale flame hole train (Pale flame hole)
35 Outer deep flame hole train (outer rich flame hole)
71 Flame hole forming part (pale flame hole forming body)
71a 2nd shaping | molding part 72 Bridging part 654 1st bulging part (convex part)

Claims (3)

A concentrated flame hole forming body for forming a central concentrated flame hole arranged so as to extend in the longitudinal direction at a central position in the lateral direction, and two rows arranged so as to sandwich the central concentrated flame hole from both sides in the lateral direction A flare hole forming body for forming a flare hole of
The thick flame hole forming body and the pale flame hole forming body are formed as an integral structure by bending using a single plate-shaped molding material formed into a predetermined shape by press molding,
In the plate-shaped molding material, a first molding part for forming the dense flame hole forming body and a pair of second molding parts for forming the pale flame hole forming body are connected to each other via a bent part. While
An outer plate member having an upper end opened and defined with a predetermined gap between opposing surfaces in the short direction,
The integral structure is ing assembled by being charged from the top opening to between opposing surfaces of said outer plate member,
Dark pale combustion burner, characterized in that. The light and dark combustion burner according to claim 1,
The plate-shaped molding material is formed such that the first molding part and the second molding part are connected to each other via one or more strip-shaped bridging parts,
The bridging portion includes a portion corresponding to a hole edge of a central rich flame hole formed on an upper end surface of the rich flame hole forming body, and a hole edge of the pale flame hole formed on the upper end surface of the pale flame hole forming body. Is arranged so as to be connected to a portion corresponding to
One or both of the side surface of the dense flame hole forming body and the side surface of the pale flame hole forming body opposite to the convex surface projecting in the short direction and positioning the relative position in the short direction between both side surfaces Concentration burning burner in which the part is formed The light and dark combustion burner according to claim 1 or 2 ,
The monolithic combustion burner is formed using a material having a thicker thickness than the outer plate member.

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