JP2018044700A - Flat burner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flat burner having, at its upper end part, longitudinal fine-shaped flame holes 61 in a forward/rearward direction in which a flame transfer protrusion 68 positioned at a specified location in a forward/rearward direction at an upper part of an outer side surface of each of the sides of the flat burner in its lateral direction is arranged, a flame transfer protrusion at one flat burner and a flame transfer protrusion at the other flat burner that are adjacent to each other in a lateral direction are abutted to each other, a clearance between the adjoining flat burners is partially closed by the flame transfer protrusions so as to perform a local prevention against ascending of secondary air flowing into the clearance from below and to promote the flame transfer between the adjoining flat burners and then enable the flat burners to be stacked up under a stable state in a vertical direction.SOLUTION: An outside surface of each of the sides of the flat burner in a lateral direction is provided with at least two lower protrusions 69 while being positioned more downward than the flame transfer protrusion 68. Positions of the two lower protrusions 69 are set in such a way that a figure connecting these lower protrusions 69 and flame transfer protrusion 68 may enclose a center of gravity of the flat burner.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a flat burner used in a combustion apparatus such as a hot water supply heat source machine.

  In general, in a hot water supply heat source machine, a plurality of flat burners having an elongated flame outlet at the upper end are arranged in parallel in a combustion housing that forcibly supplies combustion air by a combustion fan.

  Conventionally, as a flat burner of this type, it is located at a predetermined position in the front-rear direction (longitudinal direction of the flame port) on the outer surface of each side of the flat burner in the lateral direction (width direction of the flame port). By providing protrusions, bringing the flattening burner of one flat burner adjacent in the horizontal direction into contact with the flattening burners of the other flat burner, and locally closing the gap between the adjacent flat burners with the hot transfer protrusions In addition, there is known a technique in which the secondary air flowing into the gap from below is locally prevented from rising, and the fire transfer between adjacent flat burners is promoted (see, for example, Patent Document 1).

  The flat burner includes a burner body having a pair of side plates facing each other in the lateral direction, and a burner cap having a pair of side plates covering the upper part of the burner body from both sides in the lateral direction. There is also known a main flame opening provided at the upper end between the plates and a sleeve flame opening provided at the upper end between each side plate of the burner body and each side plate of the burner cap. In this flat burner, a fire transfer protrusion is provided on each side plate of the burner cap.

  By the way, at the end of the burner production line, the manufactured flat burners are picked up one by one by a robot, transported to a place on the side of the line, stacked up and down, and a predetermined number of stacked flat burners are transported by another robot. May be transferred to the basket. In this case, if a fire transfer protrusion is provided on the upper part of the outer surface of the flat burner, the flat burner is stacked in a state inclined by the amount of the fire transfer protrusion from the horizontal posture, and the flat burner is stabilized. It becomes difficult to stack in a state.

JP 2007-278622 A

  In view of the above points, an object of the present invention is to provide a flat burner that can be stacked in a stable state despite the provision of a burning projection on the outer surface.

  In order to solve the above-mentioned problem, the present invention is a flat burner having an elongated flame mouth part at the upper end, where the longitudinal direction of the flame mouth part is the front-rear direction and the width direction of the flame mouth part is the lateral direction. Fire transfer protrusions are provided on the outer surface of each side of the flat burner on each side in the front-rear direction, and are arranged at predetermined positions in the front-rear direction, and one of the flat burners adjacent in the horizontal direction and the other heat transfer protrusions of the flat burner , And the gap between adjacent flat burners is locally blocked by the burn-out projection, thereby locally preventing the secondary air flowing into the gap from below, and adjacent flat burners. In the structure that promotes the fire transfer between them, a plurality of lower protrusions are provided on the outer surface of each side of the flat burner in the lateral direction so as to be positioned below the fire transfer protrusions. The position of the two lower protrusions of the Wherein the graphic connecting the transfer protrusion is set so as to form a triangle which surrounds the center of gravity of the flat burner.

  According to the present invention, when the flat burners are stacked up and down, it is possible to suppress the flat burners from being inclined from the horizontal posture by the amount of the fire transfer protrusion by the lower protrusion. Therefore, even if the burn-out protrusion is provided on the outer surface of the flat burner, the flat burner can be stacked in a stable state.

  In the present invention, it is desirable that the protrusion height of each lower protrusion is lower than the protrusion height of the fire transfer protrusion by a predetermined amount. According to this, even if there is a manufacturing error, the actual protrusion height of the lower protrusion does not become higher than the actual protrusion height of the fire transfer protrusion. As a result, the adjacent one burner and the other flat burner can be securely in contact with each other, and the gap between the adjacent flat burners can be reliably closed by the fire transfer protrusion, resulting in poor fire transfer performance. There is nothing to do.

  The flat burner includes a burner body having a pair of side plates facing each other in the lateral direction, and a burner cap having a pair of side plates covering the upper part of the burner body from both sides in the lateral direction. In the case where it is composed of a main flame opening provided at the upper end between the plates, and a sleeve flame opening provided at the upper end between each side plate of the burner body and each side plate of the burner cap, It is desirable to provide all of the heat transfer protrusions and the lower protrusions on each side plate of the burner cap. According to this, the fire transfer protrusion and the lower protrusion are formed by the same press die for forming the burner cap, and the correlation between the protrusion height of the fire transfer protrusion and the protrusion height of the lower protrusion is out of order. Can be prevented.

  Further, generally, a plurality of indentations that are recessed inward in the lateral direction are formed on the upper part of each side plate of the burner cap, dividing the sleeve flame opening into a plurality of front and rear direction portions. And it is desirable for at least some of the plurality of lower protrusions to be located directly below any of the depressions. According to this, even if the secondary air collides with the lower protrusion and the secondary air flow toward the upper side of the lower protrusion is disturbed, the sleeve flame opening is divided at the recessed portion above the lower protrusion. Since no flame is formed, adverse effects on combustion due to turbulent secondary air flow can be avoided.

A cut side view of a combustion device provided with a flat burner of an embodiment of the present invention. The side view of the flat burner of embodiment. III-III sectional view taken on the line of FIG. The perspective view of the flat burner of embodiment. The perspective view of the decomposition | disassembly state of the flat burner of embodiment.

  Referring to FIG. 1, reference numeral 1 denotes a combustion casing constituting a combustion apparatus such as a hot water supply heat source machine. The upper surface of the combustion casing 1 is open, and an object to be heated such as a heat exchanger (not shown) is installed on the combustion casing 1. In the combustion housing 1, a partition plate 4 that partitions the space in the combustion housing 1 into a combustion chamber 2 and an air supply chamber 3 below the combustion chamber 2 is provided. A combustion fan (not shown) is connected to the bottom surface of the air supply chamber 3 via a duct 5 so that air is supplied from the combustion fan to the air supply chamber 3. A number of distribution holes 4a are formed in the partition plate 4, and the air supplied to the air supply chamber 3 is supplied as secondary air to the combustion chamber 2 through these distribution holes 4a.

  In the combustion chamber 2, a plurality of flat burners 6 according to the embodiment of the present invention having an elongated flame mouth portion 61 at the upper end are arranged in parallel. A rising portion 41 is bent at the front edge of the partition plate 4, and a manifold 7 is mounted on the front side of the rising portion 41 so as to close the lower front surface of the combustion housing 1. The manifold 7 is provided with gas nozzles 71 and 72 facing inlets 64a and 66a of mixing pipe portions 64 and 66, which will be described later, of each flat burner 6. The fuel gas injected from the gas nozzles 71 and 72 is supplied to the inflow ports 64a and 66a, and each air gap is defined between the rising portion 41 and the manifold 7 from the air supply chamber 3. Primary air is supplied to the inflow ports 64a and 66a.

  Hereinafter, the structure of the flat burner 6 will be described in detail with reference to FIGS. 2 to 5, where the longitudinal direction of the flame opening 61 is the front-rear direction and the width direction of the flame opening 61 is the lateral direction.

  The flat burner 6 includes a burner body 62 having a pair of side plates 62a and 62a facing each other in the lateral direction, and a burner cap 63 having a pair of side plates 63a and 63a covering the upper part of the burner body 62 from both sides in the lateral direction. . The both side plates 62 a and 62 a of the burner main body 62 are formed by bending one plate into a palmar state at a folding line that becomes the lower edge of the burner main body 62. Also, the burner cap 63 has a plurality of bridge portions 63b at the front and rear portions that connect the side plates 63a and 63a at their upper edges.

  The flame opening 61 is a main flame opening 61a provided at the upper end between both side plates 62a, 62a of the burner main body 62, and the upper end between each side plate 62a of the burner main body 62 and each side plate 63a of the burner cap 63. It is comprised with the sleeve flame opening part 61b provided in this. Then, a light air-fuel mixture having a leaner fuel concentration than the stoichiometric air-fuel ratio is ejected from the main flame opening 61a, and a fuel-rich mixture having a fuel concentration higher than the stoichiometric air-fuel ratio is ejected from the sleeve flame opening 61b, so-called light / dark combustion. Like to do.

  The burner body 62 is provided with a mixing pipe portion 64 extending rearward from an inlet 64a located at the lower front end thereof, and a distribution chamber portion 65 extending upward while extending forward from the upper rear end of the mixing pipe portion 64. Yes. And the light air-fuel mixture from the mixing pipe part 64 is led to the main flame opening part 61a through the distribution chamber part 65. Further, another mixing tube portion 66 is provided at the front portion of the burner body 62 so as to be positioned between the mixing tube portion 64 and the distribution chamber portion 65. The mixing tube portion 66 terminates slightly backward from the inlet 66a located at the front end of the burner body 62, and a vent hole 66b is formed on the side surface of the rear end portion. Then, the rich air-fuel mixture from the mixing pipe portion 66 passes through the ventilation holes 66b and the passage portions defined between the side plates 62a of the burner body 62 and the side plates 63a of the burner cap 63, and the sleeve flame opening portion. 61b is guided.

  A rectifying member 67 having a plurality of rectifying plates 67a arranged side by side is attached to the main flame opening 61a. On the upper side of each side plate 62 a of the burner main body 62, longitudinal recesses 62 b are formed in the front-rear direction that are recessed inward in the lateral direction and abut against the rectifying plate 67 a outside the rectifying member 67. Then, a blind gap 61c is formed between the upper end of the side plate 62a above the recess 62b and the outer rectifying plate 67a so that no air-fuel mixture is ejected, and the air-fuel mixture ejected from the main flame opening 61a is above the blind air gap 61c. In order to obtain a flame-holding effect.

  The rectifying member 67 has the inner and outer rectifying plates 67a in contact with a plurality of front and rear portions that coincide with the bridge portion 63b of the burner cap 63, and the flame channel defined between the rectifying plates 67a is moved forward and backward. A pair of upper and lower contact portions 67b that divide in the direction is provided. In addition, a plurality of recessed portions 63 c that are recessed inward in the lateral direction are provided on the upper portions of the side plates 63 a of the burner cap 63, dividing the sleeve flame opening 61 b into a plurality of portions in the front-rear direction. These recess portions 63 c are provided at front and rear positions that match the bridge portion 63 b of the burner cap 63.

  Further, on the upper part of the lateral side of the flat burner 6 on each side, that is, on the upper part of each side plate 63a of the burner cap 63, a fire transfer projection 68 is provided at the center in the front-rear direction. Then, one flat burner 6 adjacent in the horizontal direction and the fire transfer protrusions 68 of the other flat burner 6 are brought into contact with each other, and a gap between the adjacent flat burners 6, 6 is formed by the fire transfer protrusion 68. By locally blocking, the secondary air flowing into the gap from below is prevented from rising locally. When the secondary air is prevented from rising as described above, the air-fuel mixture ejected from the sleeve flame opening 61b of the flat burner 6 is easily diffused in the lateral direction, and the fire transfer between the adjacent flat burners 6 and 6 is promoted. The

  However, when the fire transfer protrusion 68 is provided, when the flat burner 6 is picked up and stacked up and down at the end of the flat burner production line, the flat burner 6 is inclined by the amount of the fire transfer protrusion 68 from the horizontal posture, so that the flat burner It becomes difficult to stack 6 in a stable state.

  Therefore, in the present embodiment, the front and rear two lower projections 69 are provided on the outer side surface of each side of the flat burner 6 so as to be positioned below the fire transfer projection 68. The positions of the two lower protrusions 69 and 69 are set so that the figure connecting the two lower protrusions 69 and 69 and the fire transfer protrusion 68 forms a triangle T surrounding the center of gravity G of the flat burner 6. The According to this, when the flat burners 6 are stacked up and down, the flat burners 6 are inclined from the horizontal posture by the amount of the fire transfer protrusions 68, and the lower protrusions 69 and 69 of the upper and lower flat burners 6 and 6 are in contact with each other. Can be suppressed. Therefore, even if the fire transfer protrusion 68 is provided on the outer surface of the flat burner 6, the flat burner 6 can be stacked in a stable state.

  If the protrusion height of each lower protrusion 69 is made equal to the protrusion height of the fire transfer protrusion 68, the actual protrusion height of the lower protrusion 69 becomes higher than the actual protrusion height of the fire transfer protrusion 68 due to manufacturing errors. May end up. In this case, one adjacent flat burner 6 and the fire transfer protrusions 68 of the other flat burner 6 do not contact each other, and the gap between the adjacent flat burners 6, 6 can be closed by the fire transfer protrusion 68. However, the secondary air flows upward, resulting in poor fire transfer performance.

  Therefore, in the present embodiment, the projecting height of each lower projection 69 is made a predetermined amount lower than the projecting height of the fire transfer projection 68. According to this, even if there is a manufacturing error, the actual protrusion height of the lower protrusion 69 does not become higher than the actual protrusion height of the fire transfer protrusion 68. As a result, the one adjacent flat burner 6 and the fire transfer projections 68 of the other flat burner 6 abut on each other, and the gap between the adjacent flat burners 6 and 6 is surely secured by the fire transfer protrusion 68. The fire transfer performance is not deteriorated.

  By the way, the lower protrusion 69 can be provided on the side plate 62 a of the burner main body 62 located below the side plate 63 a of the burner cap 63. However, in this case, the fire transfer protrusion 68 and the lower protrusion 69 are formed by separate press dies for forming the burner cap and the burner body, and the protrusion height of the fire transfer protrusion 68 and the lower protrusion 69 are formed. There is a possibility that the correlation with the projecting height of the head will be out of order.

  Therefore, in the present embodiment, all of the fire transfer protrusions 68 and the lower protrusions 69 are provided on each side plate 63 a of the burner cap 63. According to this, the fire transfer protrusion 68 and the lower protrusion 69 are formed by the same press die for forming the burner cap, and the protrusion height of the fire transfer protrusion 68 and the protrusion height of the lower protrusion 69 are the same. It is possible to prevent the correlation from being distorted.

  Further, in the present embodiment, the rear lower protrusion 69 of the two lower protrusions 69, 69 is positioned directly below the rearmost recessed portion 63 c of the side plate 63 a of the burner cap 63. According to this, even if the secondary air collides with the lower protrusion 69 to cause a disturbance in the secondary air flow directed upward of the lower protrusion 69, the sleeve flame opening at the position above the lower protrusion 69 is formed by the recess 63 c. Since 61b is divided and no flame is formed, adverse effects on combustion due to the disturbance of the secondary air flow can be avoided.

  The front lower protrusion 69 is slightly rearwardly shifted from the position immediately below the foremost recess 63c of the side plate 63a of the burner cap 63. This is because the lower protrusion 69 is disposed immediately below the foremost recess 63c. This is because the space could not be secured, and if the installation space can be secured, it is desirable to position the front lower protrusion 69 directly below the foremost recess 63c.

  As mentioned above, although embodiment of this invention was described with reference to drawings, this invention is not limited to this. For example, as long as the two lower protrusions 69 are positioned at the remaining two vertices of the triangle T surrounding the gravity center G of the flat burner 6 where the fire transfer protrusion 68 is positioned at one vertex, another position can be set at any position. A lower protrusion may be provided. Moreover, although the flat burner 6 of the said embodiment is a density combustion type burner provided with the burner cap 62, this invention is applicable similarly to the flat burner which is not the density combustion type which abbreviate | omitted the burner cap.

6 ... Flat burner, 61 ... Flame port, 61a ... Main flame port, 61b ... Sleeve flame port, 62 ... Burner body, 62a ... Burner body side plate, 63 ... Burner cap, 63a ... Burner cap side plate, 63c ... recessed portion, 68 ... fire-transfer protrusion, 69 ... lower protrusion.

Claims (4)

A flat burner having an elongated flame mouth at the upper end, the longitudinal direction of the flame mouth being the front-rear direction and the width direction of the flame mouth being the lateral direction, the upper part of the outer surface on each side of the flat burner In addition, a fire transfer protrusion is provided at a predetermined position in the front-rear direction, and one of the flat burners adjacent in the lateral direction and the fire transfer protrusions of the other flat burner are brought into contact with each other, and the adjacent flat burners are By locally closing the gap with the projection for fire transfer, the rise of the secondary air flowing into the gap from the lower side is locally prevented to promote the fire transfer between adjacent flat burners. In
A plurality of lower projections are provided on the outer surface of each side of the flat burner on the lateral side of the flat burner so as to be positioned below the fire transfer projections. A flat burner characterized in that the figure connecting the lower protrusion and the fire transfer protrusion is set to form a triangle surrounding the center of gravity of the flat burner.   2. The flat burner according to claim 1, wherein the protrusion height of each lower protrusion is made a predetermined amount lower than the protrusion height of the fire transfer protrusion.   3. The flat burner according to claim 1, comprising a burner body having a pair of side plates facing each other in the lateral direction, and a burner cap having a pair of side plates covering the upper part of the burner body from both sides in the lateral direction. The mouth portion is composed of a main flame mouth portion provided at an upper end portion between both side plates of the burner body, and a sleeve flame mouth portion provided at an upper end portion between each side plate of the burner body and each side plate of the burner cap. In the present invention, the flat burner is characterized in that each of the side projections of the burner cap is provided with all of the projections for fire transfer and the lower projections. 4. The flat burner according to claim 3, wherein a plurality of hollow portions recessed inward in the lateral direction are formed in the upper portion of each side plate of the burner cap, the sleeve flame opening being divided into a plurality of front and rear direction portions. The flat burner according to claim 1, wherein at least a part of the plurality of lower protrusions is located immediately below any of the recesses.

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