JP5300580B2 - Burner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a burner capable of unifying a pressure distribution of a mixed gas at a burner port, and preventing vertical movement of flame by reducing vortex generated at a lower end section of the burner port. <P>SOLUTION: In a straightening section at a longitudinal end side of the straightening member where a pressure of the mixed gas flowing in from a distribution chamber is increased, a third flow channel 77C formed on a part just above a mixing gas inflow passage 88, is formed narrower than a second flow channel 77B, a first flow channel 77A, a forth flow channel 77D and a fifth flow channel 77E at an outer side of the third flow channel, thus a flow rate of the mixed gas in the third flow channel 77C at a central section is reduced, and a pressure of the mixed gas at the burner port can be unified. Further as a spatial section 102 is formed at lower end sections of the second flow channel 77B and the first flow channel 77A, and a spatial section 101 is formed at lower end sections of the forth flow channel 77D and the fifth flow channel 77E, the pressure of the mixed gas flowing into the first flow channel 77A, the second flow channel 77B, the forth flow channel 77D and the fifth flow channel 77E can be unified. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a burner, and more particularly, to a burner having a pale flame hole and a deep flame hole.

  Conventionally, in order to reduce NOx emissions in gas combustion equipment, a main flame is formed by burning a fuel-air mixture gas (hereinafter, referred to as a pale gas), which is leaner than the stoichiometric air-fuel ratio, in a central pale flame hole. In the rich flame holes on both sides of the pale flame hole, a low NOx burner is used that burns a fuel-air mixed gas (hereinafter referred to as rich gas) having a fuel richer than the stoichiometric air-fuel ratio to form a sleeve flame.

  For example, a low NOx burner including a burner unit in which a central pale flame hole and concentrated flame holes on both sides are integrally formed is known (see, for example, Patent Document 1). In this conventional low NOx burner, a flame port composed of a plurality of rectifying plates is formed above the distribution pipe portion. Further, in the longitudinal direction of the low NOx burner, a throttle portion is formed in order to make the pressure of the mixed gas jetted to the flame outlet uniform.

JP 2001-182910 A

  However, since the mixed gas having a high flow velocity that has passed through the throttle portion directly hits the lower portions of the plurality of rectifying plates forming the flame mouth, only the pressure at the center of the flame mouth is high, and in the direction perpendicular to the longitudinal direction of the low NOx burner. There was a problem that the pressure distribution of the was not uniform. Further, there is a problem that a vortex is generated in the vicinity of the lower end of the current plate, and the flame moves up and down.

  The present invention has been made in order to solve the above-mentioned problems. The pressure distribution of the mixed gas at the flame mouth is made uniform, and the vortex generated at the lower end of the flame mouth is reduced, so that the flame moves up and down. It aims at providing the burner which prevents doing.

In order to achieve the above object, a burner according to a first aspect of the present invention has an elongate flame opening at the upper end that opens upward, the longitudinal direction of the flame opening being the front-rear direction, and the flame opening A rectifying member having a burner body composed of a pair of side plates facing each other in the lateral direction, and a plurality of rectifying plates arranged in parallel in the lateral direction, with the short direction of the section as the lateral direction And a thick flame mouth formed at a position sandwiched between the straightening member and the side plate on both sides in the lateral direction of the pale flame mouth. A burner having a plurality of flaming units arranged in the front-rear direction, each of the flaming units provided outside the pair of rectifying plates constituting a central flaming port among the rectifying plates. The base plate of the current plate is cut to a predetermined length, The base of each end-side regulating plate provided outside the al is constructed in the same length as the pair of flow plates constituting the flame port of the central portion, and the base of the end-side regulating plate, the central portion Space portions are respectively provided between the base portions of the pair of rectifying plates constituting the flame outlet , and further, the outer side of the base portion of the end-side rectifying plate swells to the flow path side for sending the concentrated gas to the rich flame outlet. It is characterized in that a bulging portion which is a space is formed .

  In addition to the configuration of the invention according to claim 1, the burner of the invention according to claim 2 is configured such that the interval between the pair of rectifying plates constituting the flame port at the center of the plurality of rectifying plates is other rectifying It is characterized by being narrower than the distance between the plates.

  In addition to the configuration of the invention according to claim 1 or 2, the burner of the invention according to claim 3 is configured such that the interval between the plurality of rectifying plates is the same as the interval between the inner rectifying plates. It is characterized by being narrower than the distance between the plates.

  According to a fourth aspect of the present invention, there is provided a burner of the invention according to any one of the first to third aspects, in addition to a mixing pipe portion in which fuel gas and primary air are mixed at a base portion of the burner. A distribution pipe part that is connected to the mixing pipe part and extends in the front-rear direction of the flame port part on the upper side of the mixing pipe part, and the space part in the high-pressure portion of the mixed gas flow coming out of the distribution pipe part Is provided.

In the burner according to claim 1, the base of the rectifying plate provided outside each of the pair of rectifying plates constituting the central flaming port among the plurality of rectifying plates in the flaming unit is predetermined. A space portion is formed between the base portion of each end-side rectifying plate provided on the outer side of each of the rectifying plates and the base portion of the pair of rectifying plates constituting the central flame port. Since each is provided, the mixed gas flows into the flow path formed by each rectification through the space portion that becomes a wide flow path, so the flow of the mixed gas becomes gentle and outside the lower end of the flow path. Large swirl of mixed gas does not occur. Therefore, it is possible to prevent the flame formed in the flame port from vibrating up and down by stabilizing the flow of the mixed gas.

  Further, in the burner according to claim 2, in addition to the effect of the invention according to claim 1, the interval between the pair of rectifying plates constituting the flame port at the center of the plurality of rectifying plates is between the other rectifying plates. Since it is narrower than the interval, the pressure of the mixed gas at the flame outlet can be made uniform by reducing the flow rate of the mixed gas at the central flame outlet.

  Further, in the burner according to claim 3, in addition to the effect of the invention according to claim 1 or 2, the interval between the plurality of rectifying plates is the same as the interval between the inner rectifying plates. Therefore, the width of the flow path of the mixed gas becomes narrower toward the inner flame port, and the pressure of the mixed gas at the flame port can be made uniform.

  Further, in the burner according to claim 4, in addition to the effect of the invention according to any one of claims 1 to 3, the base portion of the burner includes a mixing tube portion in which fuel gas and primary air are mixed, and A distribution pipe part that is connected to the mixing pipe part and extends in the front-rear direction of the flame port part on the upper side of the mixing pipe part, and the space part is provided in a high-pressure portion of the mixed gas flow that exits from the distribution pipe part Therefore, the pressure of the mixed gas at the flame opening where the high pressure portion of the mixed gas flow collides can be made uniform.

1 is a perspective view of a burner 1. FIG. 1 is a plan view of a burner 1. FIG. FIG. 3 is a partially enlarged view of the vicinity of a flame opening unit 95 shown in FIG. 2. 3 is a perspective view of a light burner unit 20. FIG. 3 is a perspective view of a dark burner unit 40. FIG. It is the perspective view seen from the slanting upper side of rectification member 70. It is the perspective view seen from the slanting lower side of rectification member 70. FIG. 2 is a cross-sectional view taken along the line I-I in FIG. 1. FIG. 2 is a cross-sectional view taken along the line II-II in FIG. It is sectional drawing of the principal part of the burner 100 which is a modification.

  Hereinafter, the burner 1 which is one Embodiment of this invention is demonstrated with reference to drawings. In the following description, the lower left diagonal in FIG. 1 is the front of the burner 1, the upper right diagonal is the rear of the burner 1, the lower right diagonal is the right side of the burner 1, and the upper left diagonal is the left side of the burner 1.

  The burner 1 of this embodiment is mounted and used in the case of a water heater. The burner 1 burns a fuel-air mixed gas (hereinafter referred to as a light gas) whose fuel is thinner than the stoichiometric air-fuel ratio in the central light flame hole 87 to form a main flame, and the rich flame on both sides of the light flame hole 87. This is a low NOx burner that burns a fuel-air mixed gas whose fuel is richer than the stoichiometric air-fuel ratio in holes 97 and 98 (hereinafter referred to as a rich gas) to form a sleeve flame.

  First, the overall structure of the burner 1 will be schematically described with reference to FIGS. 1 to 3. The burner 1 includes a thin box-like burner main body 2 having an upper opening. At the upper part of the burner body 2, an elongated flame opening 30 is provided that opens upward. A rectifying member 70 having a plurality of rectifying plates for rectifying the fresh gas flowing from below is attached to the inside of the flame opening 30. The flame opening 30 is divided into six regions by five connecting pieces 54. In the region, flame unit 95 having various flame holes is formed. Therefore, a flame mouth group composed of six flame mouth units 95 is formed in the flame mouth portion 30 of the burner body 2.

  In each flame outlet unit 95, a light flame hole 87 including a plurality of slit flame holes is provided at the upper end portion of the rectifying member 70. On both sides of the light flame hole 87 in the left-right direction (lateral direction), elongated deep flame holes 97 and 98 are respectively provided. Between the light flame hole 87 and the rich flame holes 97 and 98, the circulation regions 13 and 14 (see FIGS. 2 and 3), which are predetermined gaps, are respectively provided. In the light flame hole 87, a light flame burns to form a main flame. In the rich flame holes 97 and 98, the rich gas burns to form a sleeve fire. The main flame can be held by sandwiching the main flame with a pair of sleeve fires.

  As shown in FIG. 1, a light gas inlet 25 having a vertically long oval shape in front view for opening a light gas is provided below the front end portion of the burner body 2 so as to take in light gas. Below the burner body 2, a substantially straight gas passage 26 that extends in the front-rear direction of the burner body 2 and communicates with the light gas inlet 25, and a downstream end toward the rear of the gas passage 26. A gas passage 27 bent upward is provided.

  A downstream end portion bent upward of the gas passage 27 is provided with a distribution chamber 28 (see FIG. 4) having an inverted triangular shape in side view in which the flow path width is enlarged in the front-rear direction of the burner body 2. The distribution chamber 28 communicates with the inside of the flame opening 30. A distribution chamber 50 having an inverted triangular shape in a side view is provided in the front-rear direction of the burner body 2 so as to cover the distribution chamber 28 from the outside. The distribution chamber 50 communicates with the concentrated gas inlet 45 described later and the inside of the flame port 30.

  As shown in FIG. 1, a concentrated gas inlet 45 having a substantially circular shape in front view for taking in concentrated gas is provided on the upper side of the light gas inlet 25. The rich gas inlet 45 communicates with a gas passage 46 that gradually increases in diameter from the front to the rear of the burner 1. A gas passage 47 bent upward is provided at the downstream end of the gas passage 46. The downstream side end portion folded back above the gas passage 47 communicates with the distribution chamber 50 described above.

  Therefore, in the burner 1, the light gas that has flowed into the light gas inlet 25 and the gas that has flowed into the rich gas inlet 45 flow through the gas passages described later, and flow into the flame port 30. The light gas is supplied to the light flame hole 87 of the rectifying member 70. The rich gas flows through a gap outside the rectifying member 70 in the flame opening 30 and is supplied to the rich flame holes 97 and 98.

  Next, the structure of the burner body 2 will be described. As shown in FIGS. 1 to 3, the burner body 2 includes a light burner unit 20 formed by press molding using sheet metal, spot welding, and the like, and both sides of the light burner unit 20 sandwiched by caulking and spot welding. The dark burner unit 40 is integrally connected, and is configured as one unit.

  First, the structure of the light burner unit 20 will be described with reference to FIG. The light burner unit 20 is formed in a concavo-convex shape by press molding using a single sheet metal, spot welding, or the like, and is formed in a substantially rectangular shape in side view. At the upper end of the light burner unit 20, the above-described flame opening 30 which is an elongated opening is provided. The flame opening 30 is formed on the inner side between a pair of side plates 21 and 22 arranged to face each other with a predetermined width. At the same position slightly below the upper ends of the side plates 21 and 22, recessed portions 29 (see FIGS. 4 and 8) recessed inwardly extend in the front-rear direction of the light burner unit 20. .

  The light gas inlet 25 described above is provided below the front end portion 33 of the light burner unit 20. On the lower end portion 34 side of the light burner unit 20, the above-described gas passage 26 and gas passage 27 communicating with the light gas inlet 25 are provided. The distribution chamber 28 described above is provided at a substantially interrupted position in the vertical direction of the light burner unit 20. The distribution chamber 28 diffuses the fresh gas flowing from the gas passage 27 uniformly in the front-rear direction of the burner body 2. The fresh gas that has flowed through the distribution chamber 28 flows into the flow straightening member 70 (see FIG. 1) assembled to the flame opening 30 from below. The main flame is formed by burning the light gas in the light flame hole 87 (see FIG. 1).

  Next, the structure of the dark burner unit 40 will be described with reference to FIG. The dark burner unit 40 is formed in a concavo-convex shape by press molding using a sheet metal, spot welding, or the like, and is formed in a substantially rectangular shape in side view. The dark burner unit 40 is provided with an elongated flame mouth opening 53 along substantially the center of one sheet metal, and both ends are folded downward so that the flame mouth opening 53 becomes the upper end. At the upper ends of the side plates 41 and 42 forming the opening 53 for the flame opening, the above-described five connecting pieces 54 are provided side by side in the front-rear direction of the dark burner unit 40 at a predetermined interval. .

  The concentrated gas inlet 45 described above is provided at the lower part of the front end portion 57 of the concentrated burner unit 40. The gas passage 46 and the gas passage 47 described above are provided on the lower end side of the dark burner unit 40, respectively. The distribution chamber 50 described above is provided in the approximate center of the dark burner unit 40. Behind the lower end portion of the dark burner unit 40, a bulging-shaped semicircular cross-sectional cover portion 48 communicating with the lowermost end portion of the distribution chamber 50 is provided.

  Next, the structure of the rectifying member 70 will be described with reference to FIGS. FIG. 6 is a perspective view of the rectifying member 70 as viewed obliquely from above, and FIG. 7 is a perspective view of the rectifying member 70 as viewed from obliquely below. The rectifying member 70 is a unit member having six horizontally long rectifying plates. In the rectifying member 70, six rectifying plates are arranged at a predetermined interval in the lateral direction, and both ends in the longitudinal direction are bent together and fixed by caulking. As shown in FIGS. 6 and 7, the six rectifying plates are each provided between a pair of end-side rectifying plates 91 and 92 disposed on both sides thereof, and between the end-side rectifying plate 91 and the end-side rectifying plate 92. The rectifying plates 71, 72, 73, and 74 are arranged. For convenience of explanation, the four rectifying plates arranged from the end rectifying plate 91 side to the end rectifying plate 92 are referred to as rectifying plates 71, 72, 73, 74 in order from the end side rectifying plate 91 side. The number of current plates is not limited to this.

  As shown in FIG. 6, five concave portions 77 having a substantially semicircular shape when viewed from the front are provided at the upper ends of the end-side rectifying plates 91, 92 at predetermined intervals in the longitudinal direction of the end-side rectifying plates 91, 92. Is provided. Five concave portions 78 having a substantially semicircular shape when viewed from the front are also provided at predetermined intervals in the longitudinal direction of the end-side rectifying plates 91, 92 on the lower ends of the end-side rectifying plates 91, 92. The recesses 77 and 78 provided in the end-side rectifying plate 91 and the recesses 77 and 78 provided in the end-side rectifying plate 92 are provided at the same position in the longitudinal direction of the rectifying member 70. In the recesses 77 and 78, the end-side rectifying plates 91 and 92 and the rectifying plates 71 to 74 are pressed without a gap. Between the recesses 77 and 78 positioned above and below each other, a gap between the current plates is secured. Thereby, the upper end part of the rectifying member 70 is divided into six sections. The position of each section corresponds to the position of the flame unit 95 (see FIGS. 1 and 2) configured at the upper end of the burner 1.

  Flange 91 </ b> A, 92 </ b> A extending in a direction away from each other is provided on the upper portion of the rear end portion 81 of the rectifying member 70. Flange 91 </ b> B, 92 </ b> B extending in a direction away from each other is provided on the upper portion of the front end portion 82 of the rectifying member 70. The flanges 91 </ b> A, 92 </ b> A, 91 </ b> B, and 92 </ b> B are engaged with the upper ends of the side plates 21 and 22 that form the flame opening 30, so that the flow regulating member 70 can be held inside the flame opening 30.

  As shown in FIGS. 6 to 8, in the two rectifying portions 70 </ b> A and 70 </ b> B at the central portion in the longitudinal direction of the rectifying member 70, all of the rectifying plates 71 to 74 are extended from the lower end portion to the upper end portion. On the other hand, the straightening portions 70C, 70D, 70E, and 70F on the both end sides in the longitudinal direction of the straightening member 70 are as shown in FIGS. However, the rectifying plates 71 and 74 provided on the outer sides thereof are cut off at the lower ends. Accordingly, as shown in FIGS. 7 and 9, a space 102 is formed between the end-side rectifying plate 91 and the rectifying plate 72, and a space 101 is provided between the end-side rectifying plate 92 and the rectifying plate 73. Is formed.

  Next, the flow path of the light gas and the slit flame holes 87A to 87E formed in the rectifying member 70 having the above structure will be described with reference to FIGS. A first flow path 77 </ b> A is formed between the end-side rectifying plate 91 and the rectifying plate 71. A second flow path 77B is formed between the rectifying plate 71 and the rectifying plate 72. A third flow path 77C is formed between the rectifying plate 72 and the rectifying plate 73. A fourth flow path 77 </ b> D is formed between the rectifying plate 73 and the rectifying plate 74. A fifth flow path 77E is formed between the rectifying plate 74 and the end-side rectifying plate 92. The central third flow path 77C is formed narrower than the outer second flow path 77B, first flow path 77A, fourth flow path 77D, and fifth flow path 77E. A space 102 is formed at the lower ends of the second flow path 77B and the first flow path 77A, and a space 101 is formed at the lower ends of the fourth flow path 77D and the fifth flow path 77E. Yes.

  A slit flame hole 87 </ b> A is formed between the upper end of the end-side rectifying plate 91 and the upper end of the rectifying plate 71. A slit flame hole 87 </ b> B is formed between the upper end of the rectifying plate 71 and the upper end of the rectifying plate 72. A slit flame hole 87 </ b> C is formed between the upper end of the rectifying plate 72 and the upper end of the rectifying plate 73. A slit flame hole 87 </ b> D is formed between the upper end of the rectifying plate 73 and the upper end of the rectifying plate 74. A slit flame hole 87 </ b> E is formed between the upper end of the rectifying plate 74 and the upper end of the end-side rectifying plate 92. The light flame hole 87 is constituted by the slit flame holes 87A to 87E.

  Next, the flow path of the concentrated gas formed between the light burner unit 20 and the concentrated burner unit 40 will be described with reference to FIGS. Between the side plate 21 of the light burner unit 20 and the side plate 41 of the rich burner unit 40, a sixth flow path 76A for supplying the rich gas from the distribution chamber 50 to the rich flame hole 97 is provided. Yes. Between the side plate 22 of the light burner unit 20 and the side plate 42 of the rich burner unit 40, a seventh flow path 76B for supplying rich gas from the distribution chamber 50 to the rich flame hole 98 is provided. Yes.

  In the middle of the sixth flow path 76 </ b> A, a pressure equalizing chamber 61 having a wide flow path width is formed in the recess 29 provided in the light burner unit 20. In the middle of the seventh flow path 76B, a pressure equalizing chamber 62 having a wide flow path width is formed in the recess 29 provided in the light burner unit 20. The rich gas flowing through the sixth flow path 76A and the seventh flow path 76B is uniformized in the front-rear direction of the burner 1 in the pressure equalizing chambers 61 and 62, and is supplied to the rich flame holes 97 and 98, respectively.

  Next, the circulation regions 13 and 14 formed between the pale flame hole 87 and the rich flame holes 97 and 98 will be described with reference to FIG. Between the upper end portion of the side plate 21 of the light burner unit 20 and the upper end portion of the end side rectifying plate 91 of the rectifying member 70, a circulating region 13 that is a predetermined gap is provided. The pale flame hole 87 and the rich flame hole 97 are separated from each other via the circulation region 13. Between the upper end portion of the side plate 22 of the light burner unit 20 and the upper end portion of the end side rectifying plate 92 of the rectifying member 70, a circulation region 14 that is a predetermined gap is provided. The pale flame hole 87 and the rich flame hole 98 are separated from each other via the circulation region 14. In the circulation regions 13 and 14, air circulation occurs due to the flow of the pale gas ejected from the pale flame hole 87. Due to this recirculation, the sleeve fire formed in each of the rich flame holes 97 and 98 is drawn into the main flame, so that the sleeve fire can interfere with the side surface of the main flame.

  Next, a method for assembling the burner 1 will be described. First, the rectifying member 70 shown in FIG. 6 is inserted into the inside of the flame opening 30 formed at the upper end of the light burner unit 20 shown in FIG. 4 from above. The flanges 91A, 92A, 91B, 92B formed at both ends of the rectifying member 70 are engaged with the upper ends of the side plates 21, 22 of the light burner unit 20 (see FIGS. 2 and 3). Thus, the rectifying member 70 is held in the flame opening 30.

  Next, the lower ends of the side plates 41 and 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. Then, the flame opening portion opening 53 of the dark burner unit 40 is positioned with respect to the flame opening portion 30 of the light burner unit 20. As shown in FIG. 2, when the flame opening 30 is viewed in a plan view, the plurality of connecting pieces 54 provided in the flame opening 30 are provided on the end flow straightening plates 91 and 92 of the flow regulating member 70. The plurality of recesses 77 (see FIG. 6) are arranged corresponding to the respective positions. That is, the connecting piece 54 does not block the light flame hole 87 formed in the rectifying member 70.

  On the other hand, as shown in FIG. 1, the cover portion 48 (see FIG. 5) of the dark burner unit 40 is put on the gas passage 27 (see FIG. 4) of the light burner unit 20 from the outside. At this time, the distribution chamber 50 of the dark burner unit 40 is positioned so as to cover the distribution chamber 28 (see FIG. 4) of the light burner unit 20. The distribution chamber 50 is formed by a gap between the outer surface of the light burner unit 20 and the inner surface of the dark burner unit 40. Further, the front end portion 33 of the light burner unit 20 is sandwiched between the side plates 41 and 42 that form the concentrated gas introduction port 45. Thus, the inside of the concentrated gas inlet 45 is divided into left and right at the front end 33 of the light burner unit 20. The same applies to the inside of the gas passages 46 and 47. As a result, the concentrated gas flowing into the concentrated gas inlet 45 is diverted to the left and right, so that the concentrated gas can be evenly supplied to the concentrated flame holes 97 and 98.

  Next, the elongated strip-shaped caulking pieces 57A, 57B, 57C, 57D (see FIG. 5) provided at the front end portion 57 of the dark burner unit 40 are bent so as to hold the front end portion 33 of the light burner unit 20 inside. Caulking is performed (see FIG. 1). In addition, the elongated strip-shaped caulking pieces 58A, 58B, 58C (see FIG. 5) provided at the rear end portion 58 of the dark burner unit 40 are bent so that the rear end portion 35 of the light burner unit 20 is held inside. Caulking is performed (see FIG. 1). Finally, the assembly of the burner 1 is completed by performing spot welding, pressing, or the like at places.

  Next, the mechanism of flame formation in the burner 1 will be described with reference to FIGS. 1, 3, 8, and 9. First, the process until the light gas flows through the burner 1 to form the main flame will be described. Inside the appliance of the water heater (not shown), a light gas nozzle (not shown) for jetting light gas is arranged to face the light gas inlet 25 of the burner 1. The light gas is ejected from the light gas nozzle to the light gas inlet 25. At this time, since the primary air is taken in from the surroundings by the light gas flow, the light gas and the primary air are fed into the light gas inlet 25. The sent fresh gas and primary air are mixed in the gas passage 26 and supplied to the distribution chamber 28 through the gas passage 27.

  In the distribution chamber 28, the light gas flows upward while diffusing in the front-rear direction of the burner 1, and flows into the flame outlet 30 from the lower side in each flame outlet unit 95. The fresh gas that has flowed into the flame opening 30 flows into the gas flow paths 77A to 77E from below with respect to the rectifying member 70 (see FIG. 8). The light gas that has flowed through the gas flow paths 77 </ b> A to 77 </ b> E burns in the slit flame holes 87 </ b> A to 87 </ b> E, thereby forming a main flame in the light flame hole 87. At this time, the third flow path 77C provided immediately above the mixed gas inflow path 88 in which the pressure of the mixed gas flowing in from the distribution chamber 28 is increased is the second flow path 77B and the first flow path on the outside thereof. 77A, the fourth flow path 77D, and the fifth flow path 77E are formed narrower, so that the flow rate of the mixed gas in the third flow path 77C in the central portion is decreased and an excessive amount of mixed gas flows. And the pressure of the mixed gas at the flame outlet can be made uniform.

  Further, as shown in FIG. 9, in the rectifying portions 70C, 70D, 70E, and 70F on the end side in the longitudinal direction of the rectifying member 70 where the pressure of the mixed gas flowing in from the distribution chamber 28 is increased, the second flow path 77B and A space 102 is formed at the lower end of the first channel 77A, and a space 101 is formed at the lower ends of the fourth channel 77D and the fifth channel 77E. The mixed gas flows into the first flow path 77A, the second flow path 77B, the fourth flow path 77D, and the fifth flow path 77E through the spaces 101 and 102. Accordingly, the flow of the mixed gas becomes gentle, and a large swirl of the mixed gas does not occur outside the lower ends of the first flow path 77A and the fifth flow path 77E. It is possible to prevent the fired flame from vibrating up and down.

  The present invention is not limited to the above-described embodiment, and various modifications can be made. For example, as shown in FIG. 10, the width of the third flow path 77C provided in the central portion of the rectifying member 70 of the burner 100 is the narrowest, and the second flow path 77B and the fourth flow path 77D on the outer side thereof. The width is wider than the width of the third flow path 77C, and the width of the first flow path 77A and the fifth flow path 77E outside thereof is wider than the width of the second flow path 77B and the fourth flow path 77D. Also good.

DESCRIPTION OF SYMBOLS 1 Burner 2 Burner main body 13 Circulation area 14 Circulation area 20 Light burner unit 21, 22 Side plate 30 Flame outlet 40 Dark burner unit 41, 42 Side plate 70 Rectification member 71-74 Rectification plate 85A Bottom surface 85B Side surface 87 Flare hole 88 Inflow path 91, 92 End-side rectifying plate 95 Flame unit 97, 98 Rich flame hole 100 Burner 101 Space portion 102 Space portion

Claims (4)

A pair of side plates confronting each other in the lateral direction, having an elongated flame mouth portion opening upward at the upper end portion, with the longitudinal direction of the flame mouth portion being the front-rear direction and the short direction of the flame mouth portion being the lateral direction. A burner body, a rectifying member having a plurality of rectifying plates arranged in the lateral direction and arranged in the lateral direction, a pale flame port formed at the upper end of the rectifying member, A burner having a plurality of flame mouth units arranged in the front-rear direction, each having a thick flame mouth formed at a position sandwiched between the rectifying member and the side plate on both sides of the pale flame mouth in the lateral direction,
In the flaming unit, among the plurality of rectifying plates, each of the rectifying plates provided on the outside of the pair of rectifying plates constituting the central flaming port has its base portion cut out by a predetermined length, The base of each end-side rectifying plate provided on the outer side of the rectifying plate is configured to have the same length as the pair of rectifying plates constituting the flame port of the central portion, and the base of the end-side rectifying plate and the center A space is provided between each of the bases of the pair of rectifying plates constituting the flame outlet of the part ,
Further, the burner is characterized in that a bulging portion which is a space bulging to the flow path side for sending the concentrated gas to the rich flame port is formed outside the base portion of the end side rectifying plate .   The burner according to claim 1, wherein an interval between a pair of rectifying plates constituting a central flame port among the plurality of rectifying plates is narrower than an interval between other rectifying plates.   3. The burner according to claim 1, wherein the interval between the plurality of rectifying plates is such that the interval between the inner rectifying plates is narrower than the interval between the immediately outer rectifying plates. At the base of the burner, a mixing pipe part in which fuel gas and primary air are mixed, and a distribution pipe part that is connected to the mixing pipe part and extends in the front-rear direction of the flame port on the upper side of the mixing pipe part And
The burner according to any one of claims 1 to 3, wherein the space portion is provided in a high-pressure portion of the mixed gas flow exiting from the distribution pipe portion.

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