JP4033071B2 - Manufacturing method of metal press burner - Google Patents

Description

  The present invention relates to a metal press burner formed by pressing a metal plate, which is supplied with an air-fuel mixture in which fuel gas and air are mixed in advance and burned to a flame hole, and a method for manufacturing the same.

  Conventionally, a metal press burner is known in which a thin metal plate is pressed and bent to form a flat burner unit having an air-fuel mixture passage and a burner head continuous with the air-fuel mixture passage (for example, (See Patent Document 1 or Patent Document 2). In this apparatus, a number of slit hole-shaped flame holes are formed on the tip surface of the burner head.

  The technique disclosed in Patent Document 1 is that the tip surface of the burner head is formed into a mountain shape composed of two slopes, and the above-described slit hole-shaped flame holes are formed on each slope, and the technique disclosed in Patent Document 2 is The point is that a rectifying plate parallel to the gas flow is installed immediately below the slit-shaped flame hole formed on the tip surface of the burner head.

Japanese Utility Model Publication No. 1-144616 Japanese Utility Model Publication No. 3-64314

  Here, in order to develop a new metal press burner, the current plate of Patent Document 2 is combined with the chevron-shaped burner head of Patent Document 1, and the current plate is used by using the reinforcing ribs of Patent Document 1. It is conceivable to form. For example, it is conceivable to form a metal press burner as shown in FIGS. 6 to 8 and 9A. FIG. 6 shows a metal press burner in which a burner head 230 is formed on the downstream side (upper end side in FIG. 6) of the air-fuel mixture passage 240 continuing from the throat 210. As shown in FIG. 7, the cross-sectional shape of the burner head is formed in a mountain shape including a first inclined surface 231 and a second inclined surface 232, and a slit hole-shaped flame hole 261 is formed on each inclined surface. That is, the flame hole surface 250 is formed in a mountain shape. Reference numeral 30 in FIG. 8 denotes a decompression wall member, and the decompression wall member 30 is attached to the metal press burner so as to cover the burner head 230 portion from the outside as shown in FIG. In such a chevron burner head 230, as shown in FIG. 8, the air-fuel mixture supplied in parallel to the rectifying plate 270 has both flame holes 261 on both sides of the chevron burner head in the width direction (left and right direction in FIG. 8). It is ejected from 261 diagonally in the left-right direction. As a result, as shown in FIG. 9A, two independent inner flames 510 and 510 are formed so as to extend slightly from the left and right sides from each flame hole, and the outer flame 520 includes these two inner flames 510 and 510. In this way, it extends upward in a state where it swells slightly wider in the left-right direction. That is, the outer flame 520 does not simply extend in the straight direction parallel to the current plate, but the air-fuel mixture is ejected obliquely in the left-right direction from each flame hole 261, 261, so that the air-fuel mixture and the secondary air As a result, the outer flame 520 extends upward in a state in which it expands in the left-right direction.

  Further, while forming the rectifying plate using the reinforcing ribs of Patent Document 1, the burner head is not formed in a mountain shape but is formed in a flat shape, and a flame having two slit holes is formed on the flat burner head. It is also conceivable to form holes. That is, the flame hole surface is formed as a flat surface. In this case, as shown in FIG. 9B, two independent inner flames 511 and 511 extend from the flame holes 262 and 262 in the straight traveling direction (upward) of the air-fuel mixture parallel to the rectifying plate 270, 521 simply extends upward while including these two inner flames 511 and 511. In this case, the bulge of the base of the outer flame 521 is smaller than that of the mountain shape of FIG. 9A, and the width of the outer flame 521 in the left-right direction is narrower.

  However, the following disadvantages can be considered in the metal press burners of these development plans. That is, these metal press burners are installed in various combustion devices (for example, gas water heaters), but a wide combustion range is required with an increase in the size of the combustion devices. Combustion at maximum capacity results in higher gas jet velocity, resulting in lifting and vibrational combustion problems, and combustion at minimum capacity causes red heat and deformation problems due to overheating of the flame. In particular, in the above two development proposals, the two inner flames 510, 510, 511, and 511 are in contact with each other at the base, but are independent from each other on the tip side. It is in. Therefore, in both of the above development plans, when the combustion amount is changed in a wide combustion range, if the conditions such as the air-fuel mixture fluctuate slightly, the inner flames 510 and 511 cannot be held and the flame becomes unstable. There is an inconvenience of doing. If the mixing ratio between the fuel gas and the primary air is changed temporarily and varies from the steady state, it causes a disadvantage that it is difficult to maintain the stable formation of the flame because the blow-off easily occurs. . In addition, due to the variation in the mixing ratio, the two inner flames 510, 510, 511, and 511 interfere with each other to deteriorate their holding, resulting in instability of the flame. As a result, the entire burner resonates. There is also an inconvenience that vibration combustion that generates noise is likely to occur.

  In order to solve these inconveniences, measures such as adding special parts for absorbing vibration and developing software to reduce the occurrence of inconveniences by combustion control as much as possible can be considered. New parts need to be added, and software development / implementation is required, resulting in a rise in manufacturing costs.

The present invention has been made in view of such circumstances, it is an object of production of metal press burners for such blowout by increasing the binding force of the inner flame can form hard stable flame generated It is to provide a method . In addition, an object of the present invention is to provide such a metal press burner without causing an increase in manufacturing cost.

In order to achieve the above object, in the present invention, as a method for manufacturing a metal press burner, an inward fold line extending in a straight line is set at the center position of a metal plate material, and the inward fold line is sandwiched between the same. An outward fold line is set at each of the separated positions, and a slit hole-like flame hole portion is formed through the pair of outward fold lines. Thereafter, the metal plate material is folded and overlapped at the inward folding line position, while being folded outward at right angles at the pair of outward folding line positions, each outward from the inward folding line position. The metal plate material portions up to the folding line position are brought into close contact with each other to form a pair of hanging wall portions, and a continuous flame hole is also formed in a part of the pair of hanging wall portions. 1). According to the production method, it is formed by bending a metallic plate material pressing to, slit-like flame apertured so as to extend in the widthwise direction with respect to the distal end surface of the burner head constituting the burner port surface A metal press burner , wherein the flame hole surface is formed by a pair of flat wall portions positioned on the same plane, and the joint side of the pair of flat wall portions is bent at a right angle to the inside of the burner head. A pair of drooping wall portions that hang down in close contact with the space, and continue as a flame hole. The flame holes extend opposite to each other from an outer position of the pair of flat wall portions toward the joint portion, and the burner. towards the inside of the head opening so as to extend continuously to a part of the pair of hanging wall portion, that metal press burner by forming a rectifying plate by other portions of the pair of hanging wall portion is manufactured That.

For this metal stamping burner, burner port surface is formed as an identical plane by a pair of flat wall portions, drilled burner ports to the burner port surface is continuous in the width direction, and the fire holes of the burner head Since it is formed continuously to a part of the hanging wall portion toward the inside, even if a rectifying plate constituted by the other portion of the hanging wall portion is present, it is apparently one of the integrally coupled pieces. A flame is formed on the flame hole surface. In other words, since the flame hole is continuously formed up to a part of the drooping wall portion and further to the inner side of the burner head than the flame hole surface, the mixture is divided into two by the current plate in the inner space of the burner head. When the gas is ejected from the flame hole surface, the ejection direction is changed variously, and a flow velocity difference is generated in the flow of the air-fuel mixture ejected in the various directions. As a result, even if the air-fuel mixture is ejected from both sides of the current plate toward the flame hole surface, two independent internal flames are not formed on the flame hole surface as in the prior art, but are integrated in the width direction of the burner head. A single internal flame connected to is formed. For this reason, even if the mixture ratio of the air-fuel mixture temporarily varies, unlike the case where the two independent internal flames are formed by the air-fuel mixture uniformly ejected as in the prior art, it is difficult for the air to blow off. This will increase the flame holding power. As a result, even if the combustion operation is performed in a wide combustion range, vibration combustion is difficult to occur, and generation of combustion noise can be avoided. In addition, compared with the conventional chevron-shaped flame hole surface, the outer flame base has less bulge and has a narrow and sharp flame shape. The length is also shortened. As a result, the distance between the combustion heating object and the flame front is also shorter than that of the conventional one, and the completion of the reliable combustion reaction can be expected, so that the CO emission amount can be reduced. In addition, a metal press burner that exhibits such effects can be formed by pressing and bending using a metal plate material, and there is no need to add special separate parts. It can be provided without incurring a surge.

The above-mentioned metal stamping burner, gas burner for gaseous fuel (gas) as fuel and liquid fuel (oil, etc.) may be applied to any of the vaporizing type oil burner as fuel. Further, the metal press burner of the present invention is applied to the bunsen combustion method and the semi-bunsen combustion method with a primary air rate of less than 100%, but may be applied to the all primary air combustion method with a primary air rate of 100% or more. Good.

Oite the above metal press burner, the air-fuel mixture to said burner ports from the inside space of the upper Symbol burner head in parallel to flow and the current plate, the flame hole equal to or less than the inner width of the inner space of the burner head The hanging wall portion is suspended from the flame hole surface by the length of at least half of the outer width of the burner head obtained by adding the thickness of the metal plate material to both sides of the inner width as the hanging wall portion. Ru can be. By doing so, the air-fuel mixture ejected from both sides of the current plate toward the center in the width direction of the flame hole surface is ejected to such an extent that an internal flame is formed by combining the flame holes with each other. Although the direction is diversified to cause a flow velocity difference, it is possible to make the state suppressed so as not to be excessively disturbed. In addition, the flame hole, Ru can also be opened in succession from the burner ports surface located toward the inside of the burner head to a position in the range of up to half of droop length of the depending wall portion. By doing so , the diversification of the ejection direction and the difference in the flow rate of the air-fuel mixture can be more reliably generated, and the integral connection of the internal flame and the increase in the holding force of the flame can be further ensured. become. Furthermore, the cooling effect can be sufficiently obtained by the presence of the rectifying plate formed by the hanging wall portion other than the flame hole forming portion.

Then, Oite the method for producing a metal press burner of the present invention, while superimposed by folding above Symbol inward folding line position, Ri by the folding at right angles to respectively the pair of outward folding lines located outward, A pair of hanging wall portions are formed in close contact with each other by the portions up to both outward folding lines across the inward folding line, and the pair of hanging wall portions in a state straddling the outward folding line on each side. A flame hole is formed by the slit hole-like flame hole portions on each side passing through continuously to a part of each other.

For this method of manufacturing metal press burner, it is possible to fire hole is produced reliably metal press burner you continuously until a part of the depending wall portion not each flat wall portion only.

As described above, according to the method for manufacturing a metal press burner according to claim 1 , the metal press burner is folded at the inward folding line position and overlapped, while being bent outward at right angles at the pair of outward folding line positions. The pair of hanging wall portions can be formed in close contact with each other by the portions up to both outward folding lines across the inward folding line, and the pair of hanging walls in a state straddling the outward folding line on each side The slit hole-like flame hole portions on each side that penetrate so as to be continuous with a part of the wall part can form a flame hole continuously with each other. In other words, it is possible to reliably manufacture a metal press burner in which the flame holes are continuously formed not only on each flat wall portion but also on a part of the hanging wall portion. And the metal press burner manufactured by this manufacturing method forms the flame hole surface as a same plane by a pair of flat wall portions, and the flame holes opened in the flame hole surface are continuous in the width direction and the drooping wall portion. because it is formed continuously towards the inside of the burner head up to a portion of the width direction center portion of the mixture to burner ports face divided by the rectifying plate which is constituted by another portion of the downward wall portion On the other hand, it can be ejected in various states with different ejection directions and different flow velocities, thereby forming a single internal flame that is apparently coupled to the flame hole surface. For this reason, even if the mixture ratio of the air-fuel mixture temporarily varies, unlike the case where the two independent internal flames are formed by the air-fuel mixture uniformly ejected as in the prior art, it is difficult for the air to blow off. It is possible to increase the holding power of the flame. As a result, even if the combustion operation is performed in a wide combustion range, vibration combustion is difficult to occur, and generation of combustion noise can be avoided. In addition, compared with the conventional chevron-shaped flame hole surface, the flame base is less swelled and the flame shape is narrow and sharp, and the overall flame length is shortened. Complete combustion reaction can be expected, and CO emissions can be reduced. In addition, a metal press burner that exhibits the effects as described above can be easily manufactured by press working and bending using a metal plate material without applying special separate parts or applying complicated combustion control.

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

FIG. 1 shows a metal press burner manufactured according to an embodiment of the present invention. In this metal press burner, a pressure reducing wall member 3 is attached and fixed to a press burner body 2.

  The press burner body 2 is formed by pressing and bending using a metal plate material as will be described later, and is formed in a flat box shape as a whole. The breath burner main body 2 has a bulging portion 22 extending from the throat 21 that opens to one side of the lower end portion so that the V shape is turned sideways, and a burner head 23 is formed on the upper end portion side. An air-fuel mixture passage 24 that communicates from the throat 21 to the inner space of the burner head 23 is defined in the bulging portion 22.

  A flame hole surface 25 is formed on the front end surface of the burner head 23, and a plurality of flame holes 26, 26 in the form of slit holes extending in the width direction (short direction) as shown in FIG. Are opened at predetermined intervals in the longitudinal direction of the flame hole surface 25. That is, a large number of flame holes 26 are formed penetrating inward and outward. The flame hole surface 25 is formed so that the flat wall portions 41 and 41 on both sides in the width direction are arranged on the same plane so as to constitute a flat surface as a whole, and the pair of flat wall portions 41 and 41 are formed on the joint side. The hanging wall portions 42 are formed by being bent at right angles to the air-fuel mixture passage 24 side, which is the inner space of the burner head 23, at a certain center in the width direction. The pair of hanging wall portions 42 and 42 are connected to each other by a bent portion 42a at the lower end position in a state of being in close contact with each other.

  The flame holes 26, 26,... Are arranged in such a way that two types of long and short ones in the width direction are alternately arranged, whereby flame from each flame hole 26 and external secondary air are arranged. The contact area with the is increased. The long flame hole 26 in the width direction is the main, and the short flame hole 26 is the sub. Further, as shown in FIG. 3, each flame hole 26 extends oppositely from the width direction outer side position of each flat wall portion 41 to the center position in the width direction, and a part of each hanging wall portion 42. To extend continuously. That is, each flame hole 26 is formed not only to open on the flame hole surface 25 but also to continuously open to a predetermined position toward the inside of the burner head 23 in the depth direction (downward direction in FIG. 3). Has been. A rectifying plate 27 is formed by the other portions of the pair of hanging wall portions 42, 42, that is, other portions excluding the portions where the flame holes 26 are formed. In addition, the code | symbol 43 in FIGS. 1-3 is a trunk | drum wall part, 431 is a small communication hole opened in the trunk | drum wall part 43. FIG.

  More specifically, the dimension setting of each flame hole 26 will be described. The drooping length (length in the depth direction from the flame hole surface 25) B of the drooping wall portion 42 is represented by the following equation (1). Equal to or greater than half of the width W of the surface 25 (the dimension obtained by adding the inner thickness of the inner space of the burner head 23 constituting a part of the air-fuel mixture passage 24 to the thickness t of the body wall portions 43 and 43) Is set to

B ≧ (W / 2) (1)
Further, the formation depth A (the dimension from the arc surface 25 to the bottom of each flame hole 26) A of each flame hole 26 on the hanging wall parts 42, 42 is at least the plate of the flat wall part 41 as shown in the following equation (2). It is set to be larger than the thickness t and smaller than half of the hanging length B of the hanging wall portion 42.

t <A <(B / 2) (2)
Further, the distance between the width direction edge position of each flame hole 26 and the outer end position of the flame hole surface 26 that defines the width direction length (W-2C) of each flame hole 26 (the outer edge of the flame hole surface 26). The dimension from the position to the edge position of the flame hole 26) C is set to a dimension equal to or larger than the plate thickness t of the body wall 43 as shown in the following equation (3).

C ≧ t (3)
Here, specific dimensions are exemplified as follows. That is, B = 5.0 mm, W = 6.0 mm, t = 0.4 mm, A = 2.0 mm, and C = 0.7 mm.

  The above dimension setting is determined by the following criteria. That is, the expression (1) is a condition required for exerting a cooling function for preventing the temperature overheating from the flame hole surface 25 by the hanging wall part 42 or the current plate 27, and the expression (2) is the condition of the flame hole 26. This is a condition required for changing the jet direction of the air-fuel mixture with respect to the center position in the width direction and causing a difference in flow velocity so as to exhibit a function of increasing the holding force of the flame by integral coupling of the inner flame 51 described later. Both of the above formulas (1) and (2) can exert the function of increasing the holding power of the flame by the integral connection of the inner flame 51, but do not give any excessive turbulence to the mixture, and The conditions for realizing the cooling function of the air-fuel mixture are determined. Further, the expression (3) is a condition required for increasing the holding force of the flame base by a negative pressure region generated between the upper end edge of the decompression wall member 3 and the outer end of the flame hole surface 25.

  The above metal press burner uses a metal plate material of a predetermined size (for example, a stainless steel plate), and is subjected to press processing to form a primary processed product having irregular shapes and through holes of a predetermined shape as shown in FIG. 4 is formed. This primary processed product 4 has a halved portion 40 of the throat 21, a bulging portion 22, small communication holes 431, 431,..., And a predetermined number of through holes 44, 44,. It is formed on both side portions with the inward folding line X of the position in between. The through holes 44, 44,... On the respective sides are positioned so as to straddle the outward folding lines Y, Y set in advance with a predetermined dimension therebetween with the inward folding line X interposed therebetween. . Further, other outward folding lines Z, Z are set at predetermined positions outside the through holes 44, 44,. In addition, bending joint edges 451 to 455 are additionally formed on one side portion for joining.

  Next, it is folded inward along the inward fold line X of the primary processed product 4, and then folded outwardly at both the outward fold lines Y and Y. As a result, the pair of hanging wall portions 42 and 42 are formed in close contact with each other by the portions up to the both outward folding lines Y and Y across the inward folding line X, and the through holes 44 and 44 on each side described above. ,... Are continuous with each other to form each flame hole 26. Further, after bending outwardly at both outward folding lines Z, Z and overlapping the surroundings, the bent joint edges 451 to 455 are bent (see FIG. 1). As a result, the periphery is joined to form the press burner body 2, and finally the decompression wall member 3 is attached to complete the metal press burner.

  In the case of the metal press burner having the above configuration, the mixture supplied in parallel to the rectifying plate 27 as shown by the arrows in FIG. 3 shows the flow of the air-fuel mixture from the upper end of the rectifying plate 27 to the central portion of each flame hole 26. The air jet direction is changed, and a flow velocity difference is generated in the air-fuel mixture in each changed jet direction. As a result, as shown in FIG. 9C, the internal flames 51 are integrally formed in each flame hole 26 even if the air-fuel mixture is divided by the rectifying plate 27. Therefore, the holding force is less likely to blow off. A high flame 5 is formed. In addition, the outer flame 52 also has a sharp shape with less swelling than the case of FIGS. 9A and 9B, and the flame length is also shortened. As a result, the vibration combustion generation region (vibration generation region) according to the present embodiment is more than the vibration combustion generation region (vibration generation region) in FIG. 9A or 9B as shown in FIG. Furthermore, it becomes possible to set the region where the gas amount fluctuation is severe. As a result, even if a temporary change in the mixing ratio occurs, vibration combustion is less likely to occur, and generation of combustion noise can be avoided. In addition, it is possible to reduce the CO emission amount (CO value). And, as a burner that exhibits the above effects, it can be manufactured by pressing and bending using a metal plate material like the above-mentioned metal press burner, adding special parts and complicated software for combustion control. Application is also unnecessary.

<Other embodiments>
In addition, this invention is not limited to the said embodiment, Various other embodiments are included. That is, in the above-described embodiment, two types of the long and short flame holes 26 are alternately arranged. However, the present invention is not limited to this, and one type of the main long one may be used. Further, auxiliary flame holes such as small-diameter circular holes may be added.

  In the above embodiment, it is bent at a right angle from the flat wall portion 41 to the hanging wall portion 42 at the position of the outward fold line Y. However, if the flame hole surface 25 and the current plate 27 are orthogonal to each other, the corners are rounded. Alternatively, it may be bent at a right angle, a right angle with a bending radius, or a stepwise bending through a slope.

  The present invention can be used as a combustion burner for various combustion apparatuses. For example, it can be used as a combustion burner in a gas water heater, an oil water heater, or the like.

It is a perspective view which shows embodiment of this invention. It is the elements on larger scale of the burner head of FIG. It is an expanded cross-sectional view of a burner head. FIG. 2 is a plan view of a primary processed product after being pressed on a metal plate material to produce the metal press burner of FIG. 1 and before being bent. It is a figure showing the relationship between the amount of gas fluctuations, CO value, and the vibration generation area in there. It is a perspective view of the burner of the 1st development plan using a prior art. It is the elements on larger scale of the burner head of the burner of FIG. FIG. 7 is an enlarged cross-sectional view of the burner head of the burner of FIG. 6. FIGS. 9A and 9B are cross-sectional explanatory views showing the situation of internal flame and external flame on the flame hole surface, FIG. 9A shows the situation in the first development plan, FIG. 9B shows the situation in the second development plan, FIG. 9C shows the situation in the embodiment of the present invention.

Explanation of symbols

23 Burner head 24 Mixture passage 25 Flame hole surface 26 Flame hole 27 Rectifier plate 41 Flat wall part 42 Drooping wall part 44 Through hole (flame hole part)
X Inward fold line Y Outward fold line

Claims (1)

Set an inward fold line that extends in a straight line at the center position of the metal plate material, and set an outward fold line at both sides equally spaced across the inward fold line,
After forming a slit hole-like flame hole part in a state straddling the pair of outward fold lines,
The metal plate material is folded and overlapped at the inward folding line position, while being folded outward at right angles at the pair of outward folding line positions, respectively, the outward folding line position from the inward folding line position. The metal plate material parts up to are closely adhered to each other to form a pair of hanging wall portions and to form a continuous flame hole in a part of the pair of hanging wall portions,
Manufacturing method of metal press burner.

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