JP4680880B2 - Burner equipment - Google Patents

Description

  The present invention relates to a burner apparatus, and more particularly, to a burner apparatus that takes in primary air together with fuel gas from an inlet provided in a burner body, and supplies a mixed gas of fuel gas and primary air to a combustion plate for combustion.

  Conventionally, as this type of burner device, for example, one that is used as a heat source of a warm air heater is known, and a suction port through which a gas ejection nozzle faces to allow fuel gas and primary air to flow, and the suction air A mixing pipe section that mixes the fuel gas flowing in from the mouth and the primary air to generate a mixed gas is provided. The mixing tube portion extends from the suction port in a substantially horizontal direction. Then, the mixed gas mixed by the mixing pipe part is sent from the downstream side of the mixing pipe part through the distribution chamber to a number of flame holes provided in the combustion plate and burned.

  The mixing tube portion is provided with a throat portion having a smaller flow cross-sectional area than the suction port in the vicinity of the suction port, and when the fuel gas and the primary air pass through the throat portion, both flows are disturbed. The fuel gas and the primary air are smoothly mixed in the mixing tube portion.

  By the way, it is desirable that the fuel gas and the primary air are sufficiently mixed in the mixing pipe portion. If the mixing of both is insufficient, the flame formed in the many flame holes becomes non-uniform. In addition, it is known that the mixing of the fuel gas and the primary air is performed better as the flow cross-sectional area of the throat portion is reduced. However, if the flow cross-sectional area of the throat portion is small, the fuel gas and the primary air are mixed. The passing flow rate is also reduced, and in particular, the amount of primary air sucked from the suction port is insufficient. In order to suck a large amount of primary air, the diameter of the suction port must be increased and the flow cross-sectional area of the throat portion must be made relatively large. Thus, it is difficult to achieve both good mixing and good combustion depending on the size of the flow cross-sectional area of the throat portion.

  In view of this, a burner in which an obstacle is disposed inside the mixing pipe portion so that the flow of the fuel gas and the primary air is violently disturbed inside the mixing pipe portion so that the fuel gas and the primary air are sufficiently mixed. An apparatus is known (see Patent Document 1). According to this, since the mixing of the fuel gas and the primary air is urged by the obstacle inside the mixing tube portion, both the diameter of the suction port and the flow sectional area of the throat portion can be increased.

However, by providing an obstacle inside the mixing tube portion, the flow of the mixed gas inside the mixing tube portion is hindered, and sufficient primary air may not be sucked from the suction port. For this reason, it is conceivable that the primary air amount is insufficient, which may make it difficult to obtain good combustion.
JP-A-7-63310

  By eliminating such inconvenience, the present invention can reliably mix the fuel gas and the primary air without hindering the flow inside the mixing tube portion, and further, the diameter of the suction port and the flow sectional area of the throat portion An object of the present invention is to provide a burner device capable of obtaining a good combustion with a relatively large size.

To achieve the above object, the present invention is seen extraordinary gas ejection nozzle in the axial direction, the suction port for sucking the ambient air as the primary air with the jet by the fuel gas in the fuel gas ejected from the gas ejection nozzle and A mixing pipe part that is connected to the suction port via a throat part having a smaller flow cross-sectional area than the suction port and generates a mixed gas of fuel gas and primary air, and a flame is generated by the mixed gas generated in the mixing pipe part. In the burner device having a flame hole to be formed, a rectifying member is provided outside the suction port, and the rectification member is located between the gas ejection nozzle and the suction port and spaced from the suction port. A diverting plate is provided that extends in a band shape in a direction that crosses a part of the suction port at a position, and abuts a part of the primary air toward the suction port to divert it.

  According to the present invention, since the rectifying member is outside the suction port and the flow dividing plate extends across a part of the suction port, prior to the primary air being sucked from the suction port, Disturbances can be formed in the flow of primary air by the flow dividing plate. Thereby, the turbulence of the flow of the fuel gas and the primary air in the throat portion can be increased, and the fuel gas and the primary air can be well mixed inside the mixing tube portion. In addition, since the flow dividing plate is outside the suction port, the flow inside the mixing pipe portion is not hindered by the flow dividing plate, and the amount of primary air sucked from the suction port is hardly decreased, so that a sufficient amount is obtained. Primary air can be mixed with the fuel gas. Therefore, the diameter of the suction port and the flow cross-sectional area of the throat portion can be made relatively large, and good combustion can be obtained.

  Moreover, in this invention, it is preferable to provide the plate-shaped protrusion part which protrudes above the said flow dividing plate from the outer side of the said inlet, and covers the upper direction of this inlet. The overhanging portion can suppress the diffusion of air around the suction port, and the air can be reliably sucked into the suction port as primary air. And since the said flow dividing plate is located under the overhang | projection part, the air guided by the overhang | projection part can be abutted against a diversion plate efficiently and reliably. Moreover, since the air flow from the outside of the overhanging portion toward the suction port is obtained constantly, for example, when the burner device of the present invention is used as the heat source of the hot air heater, the casing of the hot air heater It is possible to form an air flow toward the suction port with little influence from the internal air flow. Further, since the overhanging portion covers the upper portion of the suction port, foreign matters such as dust are blocked by the upper surface of the overhanging portion to prevent intrusion from the suction port, so that the durability of the burner device is improved.

  Further, in the present invention, the flow dividing plate includes a wall plate that stands on the upper surface side and faces a part of the suction port, and the wall plate has a hole portion through which primary air toward the suction port can pass. Preferably it is formed. By providing the wall plate, the primary air sucked from the suction port collides with the wall plate prior to that, and further becomes turbulent by passing through the hole. Thereby, the mixing of the fuel gas and the primary air inside the mixing pipe portion can be further promoted. In addition, for example, even if the air flow rate toward the wall plate temporarily decreases, the flow of the primary air can be reliably disturbed through the collision with the wall plate and the passage of the hole. , Good mixing of fuel gas and primary air can be maintained.

  An embodiment of the present invention will be described with reference to the drawings. The burner device 1 of this embodiment is an all primary air type used as a heat source of a hot air heater (not shown), and is attached to the burner body 2 and the upper part of the burner body 2 as shown in FIG. It is constituted by the combustion plate 3.

  The burner body 2 is integrally provided with a funnel-shaped suction port body 6 having a suction port 4 opened in a circular shape and a throat portion 5 having a smaller flow cross-sectional area than the suction port 4 at one side. The suction port body 6 is provided so that its throat portion 5 communicates with an upstream end portion of a cylindrical mixing tube portion 7 formed inside the burner body 2. A distribution chamber 8 communicating with the downstream end of the mixing tube portion 7 is formed in the upper portion of the mixing tube portion 7, and a distribution plate 10 having a plurality of through holes 9 is provided in the distribution chamber 8. The combustion plate 3 is a ceramic plate body in which a plurality of flame holes 11 are formed, and is provided horizontally above the distribution plate 10.

  A gas ejection nozzle 12 (see FIG. 4) faces the suction port 4 in the axial direction at the center thereof, and fuel gas is sent from the gas ejection nozzle 12. At this time, the primary air is taken in from the surroundings by the fuel gas flow, the fuel gas sucked from the suction port 4 and the primary air are mixed in the mixing pipe portion 7 and uniformly distributed in the distribution chamber 8, and the distribution plate 10 A flame is formed by the flame holes 11 of the combustion plate 3 through the through holes 9. In addition, what is shown with the code | symbol 13 is an oxygen deficiency detection burner.

  As shown in FIGS. 1 and 2, the suction port body 6 has an end edge of the suction port 4 integrally connected to a rectangular plate-shaped frame body 14. An opening 15 that matches the suction port 4 is formed in the frame body 14, and an upper connecting tongue piece 16 that is integrally connected to the burner body 2 is provided continuously at the upper end portion thereof. A side connection tongue piece 17 and a lower connection tongue piece 18 are connected to the one side edge and the lower edge of the frame body 14 by screws to connect to a casing of a hot air heater (not shown). Yes. Further, as shown in FIG. 4, a holder support piece 20 that supports a nozzle holder 19 to which the gas ejection nozzle 12 is attached is connected to the other side edge of the frame body 14. A plurality of vent holes 21 are formed in the holder support piece 20.

  Further, as shown in FIGS. 1 and 2, the frame body 14 is provided with a rectifying member 22 formed by bending a metal plate punched and formed in a predetermined shape. As shown in FIGS. 2 and 3, the flow regulating member 22 includes a flow dividing plate 23 that extends in a direction crossing a part of the suction port 4 at a position spaced from the suction port 4. In addition, a wall plate 24 is formed in the diverting plate 23 so as to stand up from one edge of the diverting plate 23 and extend along the diverting plate 23 to face the suction port 4, and the wall plate 24 has a plurality of holes 25 penetrating therethrough. Is formed. A connecting portion 26 that is connected to the frame body 14 by screws is connected to one end edge of the wall plate 24. The connecting portion 26 is connected to a part of the side connecting tongue piece 17 of the frame 14, and the gas distribution nozzle 23 and the wall plate 24 are separated from the suction port 4 at a position apart from the suction port 4 as shown in FIG. 12 is fixed at an upper position.

  As shown in FIGS. 2 and 3, the rectifying member 22 is formed with a plate-like protruding portion 27 that is bent horizontally from the upper end edge of the connecting portion 26. As shown in FIGS. 1 and 2, the overhanging portion 27 is located on the outside of the suction port 4 from the upper connecting tongue piece 16 of the frame body 14, and further overhangs above the flow dividing plate 23 to extend above the suction port 4. cover.

  Next, the effect | action of the rectification | straightening member 22 in the burner apparatus of this embodiment is demonstrated with reference to FIG. When the fuel gas is ejected from the gas ejection nozzle 12 toward the suction port 4, a flow is also generated in the air around the suction port 4 due to the jet G of the fuel gas, and the fuel gas flows toward the suction port 4 together with the fuel gas. At this time, since the air around the suction port 4 is prevented from being dispersed by the projecting portion 27 of the rectifying member 22 projecting above the suction port 4, the air is surely directed to the suction port 4. Further, air can enter the periphery of the suction port 4 from the outside of the overhanging portion 27 (arrow A1), and a sufficient amount of air can enter the periphery of the suction port 4 from below the gas ejection nozzle 12. (Arrow A2), the air flow toward the suction port 4 can be obtained constantly.

  The air which goes to the suction port 4 together with the fuel gas abuts on the flow dividing plate 23 and is branched before the suction port 4 above the gas ejection nozzle 12. At this time, in a state where the air flow A3 is disturbed, it is taken into the inlet 4 as primary air and further toward the throat portion 5. At the same time, the air collides with the wall plate 24 connected to the flow dividing plate 23, and further, through the hole 25, the air flow A4 is severely disturbed. Thereby, the turbulence of the air flow formed by the flow dividing plate 23 becomes more severe, and mixing with the fuel gas is promoted when heading to the throat portion 5 as primary air.

  As described above, air that is sucked into the suction port 4 as primary air is disturbed before it is sucked into the suction port 4 by the rectifying member 22, so that, for example, an obstacle or the like is introduced into the mixing pipe portion 7. It is not necessary to mix the fuel gas and the primary air, and the flow of the mixed gas inside the mixing pipe portion 7 is not hindered, so that a sufficient amount of primary air is taken in from the suction port 4. be able to.

  Further, since the flow turbulence has already occurred in the air sucked into the suction port 4 by the rectifying member 22, the mixing is sufficiently promoted even if the flow cross-sectional area of the throat portion 5 is relatively large. Generation of the mixed gas inside the portion 7 is performed smoothly and reliably. As a result, a mixed gas in which fuel gas and primary air are well mixed is supplied to the flame holes 11 of the combustion plate 3, and a flame can be formed well in the flame holes 11.

  Further, since the overhanging portion 27 covers the upper side of the suction port 4, dust from the upper side of the suction port 4 toward the suction port 4 is blocked by the overhanging portion 27, and the dust enters the burner body 2. Since it can prevent, the bad influence on the combustion by dust can be avoided.

  In this embodiment, the rectifying member 22 including the flow dividing plate 23, the wall plate 24, and the overhanging portion 27 is employed. However, for example, although not illustrated, only the flow dividing plate 23 may be provided, and the wall plate 24 is provided. Both the overhanging portion 27 and the overhanging portion 27 can be selectively provided according to the mounting space and the capacity of the hot air heater.

BRIEF DESCRIPTION OF THE DRAWINGS Explanatory sectional drawing which shows the burner apparatus of one Embodiment of this invention. Explanatory perspective view which shows the principal part of the burner apparatus of this embodiment. An explanatory perspective view showing a flow regulating member. Explanatory drawing which shows the effect | action of a baffle member.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Burner apparatus, 4 ... Suction port, 5 ... Throat part, 7 ... Mixing pipe part, 11 ... Flame hole, 12 ... Gas ejection nozzle, 22 ... Rectification member, 23 ... Shunt plate, 24 ... Wall board, 25 ... Hole Part, 27 ... overhang part.

Claims (3)

Axially seen gas ejection nozzle is extraordinary, suction port for sucking the ambient air as the primary air with the jet by the fuel gas in the fuel gas ejected from the gas ejection nozzle and the throat cross-sectional flow area than the suction inlet is small portion In a burner device comprising a mixing tube section that is connected to the suction port through which a mixed gas of fuel gas and primary air is generated, and a flame hole that forms a flame by the mixed gas generated in the mixing pipe section.
A rectifying member is provided outside the suction port,
The straightening member extends in a band shape in a direction crossing a part of the suction port at a position above the gas ejection nozzle and the suction port and away from the suction port, and is primary to the suction port. A burner device, characterized in that a flow dividing plate is provided which divides a part of the air against it. The burner device according to claim 1, wherein the rectifying member includes a plate-like projecting portion that projects from the outside of the suction port to above the flow dividing plate and covers the suction port. The flow dividing plate is provided with a wall plate standing on the upper surface side thereof and facing a part of the suction port,
The burner device according to claim 1 or 2, wherein the wall plate is formed with a hole through which primary air directed toward the suction port can pass.

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