JP6328943B2 - Tint burner - Google Patents

Description

  The present invention is directed to the upper end of the flared gas mixture having a leaner fuel concentration than the stoichiometric air-fuel ratio in the front-rear direction and the blind located on both sides of the flared port in the lateral direction. The present invention relates to a light and dark burner having a gap and a rich flame outlet that is located laterally outside each blind gap and that ejects a rich mixture having a fuel concentration higher than the stoichiometric air-fuel ratio.

  Although this type of light and dark burner can reduce NOx generated during combustion, vibration combustion tends to occur during high load combustion, and combustion noise becomes a problem. In view of this, conventionally, there has been known a configuration in which the pale flame mouth is divided into a plurality of front and rear blocks so that the fuel concentration of the pale air-fuel mixture varies within each block (see, for example, Patent Document 1). In this case, the frequency of vibration generated by the combustion of the pale air-fuel mixture ejected from the pale flame outlet is dispersed due to the variation in the fuel concentration, and the vibration combustion is suppressed.

  However, if the fuel concentration of the light mixture is varied as in the above conventional example, the combustibility is likely to deteriorate, and the good combustion range (the range in which good combustion is possible) becomes narrow, resulting in changes in the gas amount and the delivery of combustion air. There is a problem that the margin for air volume change is reduced.

Japanese Patent No. 3614745

  By the way, as a result of diligent efforts, the inventors of the present application have determined that the combustion frequency on one side in the lateral direction and the combustion frequency on the other side in the lateral direction of the light flame (flame formed by the combustion of the light mixture ejected from the light flame port). Are equal, and when this combustion frequency matches the natural frequency of the combustion housing, exhaust pipe, and the like housing the light and dark burner, it has been found that high-frequency resonance is generated.

  In view of the above points based on this knowledge, the present invention has as its object to provide a light and dark burner that can suppress the generation of high-frequency resonance noise during combustion without varying the fuel concentration of the light mixture. Yes.

In order to solve the above-mentioned problems, the present invention is located at the upper end of the flaming port that is longitudinal in the front-rear direction for injecting a light mixture whose fuel concentration is leaner than the stoichiometric air-fuel ratio, and on both sides of the flaming port in the lateral direction. A concentration burner having a blind gap where no air-fuel mixture is ejected and a rich flame outlet which is located laterally outside each blind gap and which emits a rich air-fuel mixture having a fuel concentration higher than the stoichiometric air-fuel ratio. The light flame deforms so that the shape of one side in the horizontal direction and the shape on the opposite side of the light flame formed by the combustion of the jet fuel mixture are asymmetric with respect to the longitudinal center line of the light flame mouth. It comprises flame deformation means, and the pale flame deformation means comprises the height of the upper end of the plate that partitions the pale flame mouth and the blind gap on one side in the lateral direction and the upper end of the plate that partitions the pale flame mouth and the blind gap on the opposite side in the lateral direction. Or a blind gap on one side of the flaming mouth in the lateral direction. The height of the top edge of the plate separating the thick flame outlet on the outside in the horizontal direction is different from the height of the top edge of the plate separating the blind gap on the opposite side of the pale flame mouth and the thick flame mouth on the outside in the horizontal direction. characterized Rukoto configured.

  According to the present invention, the combustion frequency on one side in the lateral direction of the light flame and the combustion frequency on the opposite side in the lateral direction are different due to the shape difference, and generation of high-frequency resonance noise during combustion is suppressed. The In the present invention, it is not necessary to vary the fuel concentration of the fresh air-fuel mixture, and inconvenience when the fuel concentration is varied, that is, the combustibility is likely to deteriorate, and a good combustion range (a range where good combustion is possible) is achieved. It becomes narrower, and it is possible to solve the problem that the margin for the change in the gas amount and the change in the blowing amount of the combustion air is reduced.

  Further, in the present invention, the pale flame mouth is divided into a plurality of front and rear blocks, and the pale flame deforming means is a pale flame formed by the combustion of the pale mixture that is ejected from the even-numbered pale flame mouth blocks from the front. The shape on the one side in the horizontal direction and the shape on the other side in the horizontal direction of the light flame formed by the combustion of the light mixture ejected from the odd-numbered light flame block from the front should be symmetrical. Is desirable. According to this, the shape of the same side in the horizontal direction of the light flame formed in the block of the light flame mouth adjacent to the front and rear can be made different from each other. For this reason, the combustion frequencies on the same side in the lateral direction of the light flame formed in the adjacent light flame opening blocks are different from each other, and the generation of high-frequency resonance noise during combustion is further suppressed.

The perspective view which shows the light and dark burner of 1st Embodiment of this invention. The perspective view of the state which removed the burner cap of the light and dark burner of 1st Embodiment. The top view of the light and dark burner of 1st Embodiment. Sectional drawing cut | disconnected by the IV-IV line of FIG. Sectional drawing of the principal part of the light and dark burner of 2nd Embodiment. Sectional drawing of the principal part of the light and dark burner of 3rd Embodiment. Sectional drawing of the principal part of the light and dark burner of 4th Embodiment. Sectional drawing of the principal part of the light and dark burner of 5th Embodiment. Sectional drawing of the principal part of the light and dark burner of 6th Embodiment. Sectional drawing of the principal part of the light and dark burner of 7th Embodiment. Sectional drawing of the principal part of the light and dark burner of 8th Embodiment. Sectional drawing of the principal part of the light and dark burner of 9th Embodiment.

  1 to 4, reference numeral 1 denotes a light and dark burner according to an embodiment of the present invention. The light and dark burner 1 has, at its upper end, a light flame outlet 2 that is long in the front-rear direction for injecting a light air mixture whose fuel concentration is less than the stoichiometric air-fuel ratio, and a gas mixture that is located on both lateral sides of the light flame mouth 2. Is located in a pair of blind gaps 4 and 4 where no gas is ejected, a laterally outer side of the blind gap 4 on one side in the lateral direction of the pale flame mouth 2, and a laterally outer side of the blind gap 4 on the other lateral side of the pale flame mouth 2 And a pair of rich flame ports 3 and 3 for ejecting a rich air-fuel mixture having a fuel concentration higher than the stoichiometric air-fuel ratio.

  The light and dark burner 1 has, as its constituent members, a burner body 5 having a pair of side plates 51 and 51 facing each other in the lateral direction, and a pair of covers covering the burner body 5 from the outside on one side in the lateral direction and the outside on the other side in the lateral direction. A burner cap 6 having side plates 61, 61 and a plurality of bridge portions 62 for connecting the both side plates 61, 61 at the upper edge thereof, and between the side plates 51, 51 of the burner body 5, is mounted between And a rectifying member 7 having a plurality of rectifying plates that divide 2 into a plurality of regions in the lateral direction.

  The both side plates 51, 51 of the burner body 5 are formed by bending one plate into a palmar state at a folding line that becomes the lower edge of the burner body 5. Further, the burner body 5 is formed by pressing both side plates 51, 51, and a light mixing tube portion 52 extending backward from an inflow port 52 a opened at the lower front end of the burner body 5, and a light mixing tube portion 52. And a light passage portion 53 that guides the light air-fuel mixture from the air to the light flame outlet 2. The opening area of the inlet 52a of the light mixing pipe portion 52 is relatively large, and a relatively large amount of primary air flows into the light mixing pipe portion 52 together with fuel gas from a light gas nozzle (not shown) facing the inlet 52a. Thus, a light mixture is generated. The light passage portion 53 extends from the rear end portion of the light mixing tube portion 52 so as to expand in the front-rear direction.

  Further, a thick mixing tube portion 54 formed by pressing both side plates 51, 51 is provided at a portion between the light mixing tube portion 52 and the light passage portion 53 of the burner body 5. The concentrated mixing pipe portion 54 is terminated slightly from the inflow port 54a opened at the front end of the burner body 5 to the rear, and an outflow hole 54b is formed on the outer surface of the rear portion. The opening area of the inlet 54a of the concentrated mixing pipe portion 54 is relatively small, and a relatively small amount of primary air flows into the concentrated mixing pipe portion 54 together with fuel gas from a concentrated gas nozzle (not shown) facing the inlet 54a. Thus, a rich mixture is generated.

  The rich air mixture flowing out from the outflow hole 54b of the rich mixing pipe portion 54 is sent to the rich flames via the rich passage portions 63 defined between the side plates 51 of the burner body 5 and the side plates 61 of the burner cap 6. Guided to mouth 3. Moreover, the recessed part 64 which divides the rich flame mouth 3 into several front and back blocks is formed in the front and rear several places of the upper part of each side plate 61 of the burner cap 6.

  The rectifying member 7 has a pair of inner rectifying plates 71 on the inner side in the horizontal direction and a pair of outer rectifying plates 72 located on both outer sides in the horizontal direction. There are five narrowed portions 73 at the front and rear portions that divide the pale flame mouth 2 into a plurality of front and rear blocks, specifically, six blocks 2a # 1 to # 6, in close contact with each other in the horizontal direction.

  On the upper part of each side plate 51 of the burner body 5, a longitudinal recess 55 is formed in the front-rear direction in contact with the outer rectifying plate 72, and the portion of the side plate 51 above the recess 55 and the outer rectifying plate 72 Between the side plates 51 of the burner body 5 and the side plates 61 of the burner cap 6, the rich flame port 3 is defined.

  Further, the light / dark burner 1 reduces the light flame Fa so that the shape on one side of the light flame Fa formed by the combustion of the light mixture ejected from the light flame port 2 and the shape on the opposite side in the horizontal direction are asymmetric. A light flame deformation means 8 for deformation is provided. Further, the light flame deforming means 8 is configured to control the light flame Fa formed by the combustion of the light air mixture ejected from the even-numbered light flame mouth 2 blocks, that is, the blocks 2a of # 2, # 4, and # 6. The shape of one side in the horizontal direction and the side of the light flame Fa formed by the combustion of the light mixture jetted from the odd-numbered light flame block 2 from the front, that is, the block 2a of # 1, # 3, and # 5 It arrange | positions so that the shape of a direction other side may become symmetrical.

  More specifically, a folded portion 8a that is folded back inward in the horizontal direction is formed at the upper end of the side plate 51 on one side in the horizontal direction of the burner body 5, and the lateral width of the blind gap 4 on one side in the horizontal direction of the light flame port 2 is reduced. The width of the blind space 4 on the opposite side of the flame mouth 2 is narrowed by the thickness of the folded portion 8a. Further, at the front-rear direction portion corresponding to the block 2a of # 2, # 4, and # 6, a folded portion 8a is formed at the upper end of the side plate 51 on one side in the horizontal direction (upper side in FIG. 3) of the burner body 5, and # 1 , # 3 and # 5, the folded portion 8a is formed at the upper end of the side plate 51 on the other side (lower side in FIG. 3) of the burner body 5 in the front-rear direction portion corresponding to the block 2a.

  As described above, when the width of the blind gap 4 on one side in the lateral direction of the pale flame mouth 2 is narrowed, the rich flame Fb formed by the combustion of the rich air mixture ejected from the thick flame mouth 3 outside the blind gap 4 becomes the pale flame. As approaching Fa, as shown in FIG. 4, the root portion on one side of the light flame Fa is pulled by the rich flame Fb and bulges outward, and the shape on one side of the light flame Fa and the shape on the opposite side are It becomes asymmetric. According to this, the combustion frequency on one side in the lateral direction of the light flame Fa and the combustion frequency on the opposite side in the lateral direction are different due to the shape difference, and the generation of high-frequency resonance noise during combustion is suppressed. The

  Further, the light flame Fa formed in the block 2a of # 2, # 4, and # 6 is formed in the block 2a of # 1, # 3, and # 5, with the root portion on one side in the horizontal direction bulging outward. As for the light flame Fa, the base part of the other side of the horizontal direction swells outside. That is, the shape of one side in the horizontal direction of the light flame Fa formed in the blocks 2a of # 2, # 4 and # 6 and the horizontal direction of the light flame Fa formed in the blocks 2a of # 1, # 3 and # 5 The shape on the other side is symmetrical. According to this, the shape of the same side in the horizontal direction of the light flame Fa formed in the block 2a of the adjacent light flame ports 2 is different from each other, and the combustion vibration of the same side in the horizontal direction of the light flame Fa. The numbers also differ, and the generation of high-frequency resonance noise during combustion is further suppressed.

  In addition, as a method of configuring the light flame deformation means 8 so that the width of the blind gap 4 on one side in the lateral direction of the light flame mouth 2 and the width of the blind gap 4 on the opposite side in the lateral direction of the light flame mouth 2 are different from each other, Besides the method of forming the folded portion 8a at the upper end of the side plate 51 on one side in the horizontal direction of the burner body 5 as in the first embodiment, the side plate on one side in the horizontal direction of the burner body 5 as in the second embodiment shown in FIG. A method of forming a bent portion 8b that bends inward in the lateral direction at the upper end of 51, a method of forming a folded portion 8c at the upper end of the outer rectifying plate 72 on one side in the horizontal direction, as in the third embodiment shown in FIG. As in the fourth embodiment shown in FIG. 7, a method of forming a bent portion 8d that bends outward in the lateral direction at the upper end of the outer side rectifying plate 72 on one side in the lateral direction, or a burner body as in the fifth embodiment shown in FIG. 5 above the concave strip 55 of the side plate 51 on one side (right side in FIG. 8). There is a method to approximate the amount outside the current plate 72.

  Further, the pale flame deformation means 8 includes the height of the upper end of the lateral rectifying plate 72 on one side in the lateral direction, which is a plate separating the pale flame mouth 2 and the blind gap 4 on one side in the lateral direction, the pale flame mouth 2 and the lateral direction thereof. You may comprise so that the height of the upper end of the outer side rectifying plate 72 of the horizontal direction opposite side which is a board which partitions off the blind gap 4 of the other side may differ. For example, as in the sixth embodiment shown in FIG. 9, the heights of the upper ends of the inner and outer rectifying plates 71 and 72 are sequentially directed toward the one side in the lateral direction so that the outer rectifying plate 72 on the one side in the lateral direction is the lowest. make low. According to this, the light flame is inclined toward one side in the lateral direction where the outer rectifying plate 72 having a low upper end is located, and the shape of the one side of the light flame Fa and the shape on the opposite side in the lateral direction are asymmetric. .

  As in the seventh embodiment shown in FIG. 10, only the height of the upper end of the lateral rectifying plate 72 on one side in the lateral direction may be lowered, and in one side in the lateral direction as in the eighth embodiment shown in FIG. In addition to the outer rectifying plate 72, the height of the upper end of the inner rectifying plate 71 adjacent thereto may be lowered.

  Further, as in the ninth embodiment shown in FIG. 12, the pale flame deforming means 8 is a burner body that is a plate that partitions the blind gap 4 on one side in the lateral direction of the pale flame port 2 and the thick flame port 3 on the lateral outside. 5 is opposite to the height of the upper end of the side plate 51 on one side in the horizontal direction and the burner body 5, which is a plate that separates the blind gap 4 on the opposite side in the horizontal direction of the pale flame port 2 and the thick flame port 3 on the outer side in the horizontal direction. You may comprise so that the height of the upper end of the side plate 51 of a side may differ. As shown in FIG. 12, if the upper end of the side plate 51 on one side in the horizontal direction of the burner body 5 is lowered, the inclination angle of the rich flame Fb formed in the thick flame port 3 outside the side plate 51 toward the inside in the horizontal direction becomes large. Become closer to a light flame. Therefore, the root portion on one side in the lateral direction of the light flame Fa is pulled by the rich flame Fb and bulges outward, and the shape on one side in the lateral direction of the light flame Fa and the shape on the opposite side in the lateral direction become asymmetric.

  In any of the second to ninth embodiments, as in the first embodiment, the shape of the one side of the horizontal direction of the light flame formed in the block of the even-numbered light flame opening 2 from the front, It is desirable to arrange the light flame deforming means 8 so that the shape of the other side of the light flame formed in the odd-numbered light flame block 2 is symmetrical.

  DESCRIPTION OF SYMBOLS 1 ... Dark burner, 2 ... Pale flame mouth, 2a ... Block, 3 ... Deep flame mouth, 4 ... Blind gap, 5 ... Burner main body, 51 ... Side plate (plate which divides blind gap and thick flame mouth), 72 ... Outside Rectifying plate (plate that separates the pale flame opening from the blind gap), 8...

Claims (3)

At the upper end, a pale flame mouth that is long in the front-rear direction for jetting a light mixture whose fuel concentration is leaner than the stoichiometric air-fuel ratio, a blind gap that is located on both sides of the pale flame mouth and in which the mixture does not jet, In a light and dark burner that is located laterally outside the blind gap and has a rich flame outlet that ejects a rich air-fuel mixture having a fuel concentration higher than the theoretical air-fuel ratio,
The pale flame is formed such that the shape of one side in the lateral direction and the shape on the opposite side of the pale flame formed by the combustion of the pale mixture ejected from the pale flame mouth are asymmetric with respect to the longitudinal center line of the pale flame mouth. A light flame deformation means for deforming ,
The pale flame deforming means makes the height of the upper end of the plate partitioning the pale flame mouth and the blind gap on one side in the lateral direction different from the height of the upper end of the plate separating the pale flame mouth and the blind gap on the opposite side in the lateral direction. configured shading burner, characterized in Rukoto as. At the upper end, a pale flame mouth that is long in the front-rear direction for jetting a light mixture whose fuel concentration is leaner than the stoichiometric air-fuel ratio, a blind gap that is located on both sides of the pale flame mouth and in which the mixture does not jet, In a light and dark burner that is located laterally outside the blind gap and has a rich flame outlet that ejects a rich air-fuel mixture having a fuel concentration higher than the theoretical air-fuel ratio,
The pale flame is formed such that the shape of one side in the lateral direction and the shape on the opposite side of the pale flame formed by the combustion of the pale mixture ejected from the pale flame mouth are asymmetric with respect to the longitudinal center line of the pale flame mouth. A light flame deformation means for deforming,
The pale flame deforming means includes the height of the upper end of the plate separating the blind gap on one side of the pale flame mouth and the thick flame mouth on the lateral side and the blind gap on the opposite side of the pale flame mouth and the laterally outer side. concentrated light burner, characterized in that it is configured so as to vary the dark flame hole of the the height of the upper end plate partitioning the. The pale flame mouth is divided into a plurality of front and rear blocks, and the pale flame deforming means is formed on the one side in the lateral direction of the pale flame formed by the combustion of the pale air mixture ejected from the even-numbered pale flame mouth block from the front. And the shape of the other side in the lateral direction of the light flame formed by the combustion of the light mixture ejected from the odd-numbered light flame block from the front is symmetric with respect to the longitudinal center line of the light flame mouth 3. The light and dark burner according to claim 1 or 2 , wherein the light and dark burner is arranged in a vertical direction.

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