JP4689629B2 - 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 pipe part, the flow of the mixed gas inside the mixing pipe part is hindered, and there is a risk that sufficient primary air may not be sucked from the suction port. Even if the primary air is excessively sucked, the amount of air cannot be restricted, and the primary air amount may become excessive or insufficient, and it may be 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 impeding the flow inside the mixing tube, and can stabilize the flow rate of the primary air. An object of the present invention is to provide a burner device capable of obtaining a good combustion by relatively increasing the diameter of the suction port and the flow cross-sectional area of the throat portion.

  In order to achieve this object, the present invention provides a suction port through which a gas ejection nozzle faces in the axial direction and sucks primary air together with fuel gas, and the suction port through a throat portion having a smaller flow cross-sectional area than the suction port. In the burner device comprising: a mixing pipe section that generates a mixed gas of fuel gas and primary air; and a flame hole that forms a flame by the mixed gas generated in the mixing pipe section. A rectifying member provided at a position between the nozzle and the upper rectifying member, the upper rectifying member being located above the suction port axis and extending in a direction crossing a part of the suction port; A side wall plate that extends downward from a part of the lower edge and is located on both sides or one side of the axis of the suction port and faces a part of the suction port is provided.

  According to the present invention, the rectifying member is located between the suction port and the gas ejection nozzle, and the upper wall plate and the side wall plate disturb the flow of primary air sucked from the suction port. Can be formed. 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 rectifying member is outside the suction port, the flow of the fuel gas and the primary air is not hindered as in the case where the obstacle is provided inside the mixing pipe portion, and the suction is sucked from the suction port. Since there is almost no decrease in the amount of primary air produced, a sufficient amount of 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.

  Further, by extending the side wall plate to both sides or any one side of the axis of the suction port, a large amount of primary air is temporarily sucked from the suction port even if a situation occurs toward the suction port. The amount of primary air can be moderately limited, and a reduction in combustion efficiency due to an excessive amount of primary air can be prevented.

  The side wall plate will be described in more detail. For example, when the burner device of the present invention is employed as a heat source for a warm air heater, the air inlet and the filter on the back side of the warm air heater are provided. The primary air sent from one side (filter side) as viewed from the inlet of the burner device greatly fluctuates due to removal of the filter and clogging. At this time, if the side wall plate is provided on one side (filter side) or both sides of the axis of the suction port, fluctuations in the amount of primary air are suppressed by the side wall plate, and suction is performed from the suction port. Since the amount of primary air can be stabilized, a good combustion state can be maintained. Alternatively, even when the front plate of the hot air heater is removed, the amount of primary air sent from the other side (front plate side) as viewed from the inlet of the burner device varies greatly. If the side wall plate is provided on the other side (front plate side) or both sides of the axis of the suction port, the side wall plate suppresses fluctuations in the amount of primary air, so that a good combustion state is maintained. be able to.

  In the present invention, a lower edge of the upper wall plate positioned on the axis side of the suction port, a side edge of the side wall plate positioned on the axis side of the suction port, and a lower edge of the side wall plate It is preferable to provide an extending piece extending toward the suction port. By providing the extending piece, it is possible to form more turbulence in the flow of the primary air while maintaining a smooth flow of the primary air from the periphery of the gas ejection nozzle to the suction port, and to achieve good combustion. You can definitely get it.

  In the present invention, it is preferable that the rectifying member includes a plate-like protruding portion that covers an upper portion between the suction port and the upper wall plate. 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 upper wall board is located under the overhang | projection part, the air guided by the overhang | projection part can be abutted against an upper wall board 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 matter such as dust is blocked by the upper surface of the overhanging portion, and the intrusion from the suction port is prevented. As a result, foreign matter combustion inside the burner device can be prevented, and the durability of the burner device can be improved.

  In the present invention, it is preferable that the upper wall plate has a hole through which primary air directed toward the suction port can pass. The primary air going to the suction port collides with the upper wall plate before being sucked into the suction port, but at this time, it becomes severely disturbed 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. Also, for example, even if the flow rate of the primary air toward the upper wall plate temporarily decreases, the flow of the primary air can be ensured smoothly by passing through the hole, so that the fuel gas and the primary air Good mixing with 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 rectifying member 22 includes an upper wall plate 23 that is located above the axis of the suction port 4 and extends in a direction crossing a part of the suction port 4. A plurality of hole portions 24 are formed through the upper wall plate 23, and a connection portion 25 that is screwed and connected to the frame body 14 is continuously provided at one end edge thereof. The rectifying member 22 is fixed at a position between the suction port 4 and the gas ejection nozzle 12 by the connecting portion 25.

  A part of the lower edge of the upper wall plate 23 is provided with a pair of side wall plates 26. The side wall plates 26 are located on both sides of the axis of the suction port 4 and face a part of the suction port 4. The upper wall plate 23 and the both side wall plates 26 are formed by notching a portion corresponding to a position where the suction port 4 and the gas ejection nozzle 12 face each other when punching from one metal plate. The portion surrounded by the upper wall plate 23 and the both side wall plates 26 becomes an open portion 27 through which the fuel gas ejected from the gas ejection nozzle 12 passes.

  Further, the lower edge of the upper wall plate 23 located on the axis line side of the suction port 4, the side edges of the side wall plates 26 located on the axis line side of the suction port 4, and the lower edge of the side wall plates 26 The extending piece 28 extending toward the suction port 4 is continuously provided.

  Further, as shown in FIGS. 2 and 3, the rectifying member 22 is provided with a plate-like protruding portion 29 that is bent horizontally from the upper end edge of the connecting portion 25. As shown in FIGS. 1 and 2, the overhang portion 29 is located outside the suction port 4 from the upper connecting tongue piece 16 of the frame body 14 and covers the upper portion between the suction port 4 and the upper wall plate 23. .

  Next, the effect | action of the rectification | straightening member 22 in the burner apparatus 1 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 29 of the rectifying member 22 projecting above the suction port 4, the air is surely directed toward the suction port 4.

  Further, air can enter the periphery of the suction port 4 from the outside of the overhanging portion 29 (arrow A1), and a sufficient amount of air can enter the periphery of the suction port 4 also from below the gas ejection nozzle 12. Since it is possible (arrow A2), the air flow toward the inlet 4 can be obtained constantly.

  The air toward the suction port 4 together with the fuel gas collides with the upper wall plate 23 and the side wall plate 26 of the rectifying member 22 before the suction port 4 and is surrounded by the upper wall plate 23 and the side wall plate 26. The opening part 27 which is a part is removed. At this time, the air flow A3 in contact with the extension piece 28 is disturbed, and in this state, it is taken into the inlet 4 as primary air and further toward the throat portion 5. At the same time, the air that collides with the upper wall plate 23 passes through the hole 24, thereby causing severe disturbance in the air flow A4. As a result, the turbulence of the air flowing through the open portion 27 becomes more severe, and mixing with the fuel gas is promoted when traveling toward 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.

  At this time, not only a sufficient turbulence is formed in the turbulence of the air flowing through the opening 27, but also the air flow rate is moderately limited by the side wall plate 26, so that an excessive The air flow is suppressed and a good combustion state can be maintained. That is, for example, although not shown, a filter is provided at the intake port on the back side of the hot air heater, and the flow path and flow rate of air greatly fluctuate due to the removal or clogging of the filter. Since an excessive amount of air is restricted by the plate 26 and fluctuations in the air flow are suppressed, an appropriate amount of air can be stably led to the inlet 4 as primary air. Similarly, even if the front plate of the hot air heater is removed and excessive air is about to flow into the inlet 4, the side wall plate 26 restricts the amount of air to an appropriate amount, so that an appropriate amount of air is stable as primary air. Then, it can be led to the suction port 4. Thus, by providing the said side part wall board 26, a favorable combustion state can be maintained, without being influenced by the fluctuation | variation of the air which arises inside a warm air heater.

  Further, since the overhanging portion 29 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 dammed by the overhanging portion 29, and prevents dust from entering the burner body 2. can do. As a result, adverse effects on the combustion caused by dust can be avoided.

  In the present embodiment, the pair of side wall plates 26 are provided on both sides of the axis of the suction port 4, but the side wall plates 26 are provided only on one side depending on the arrangement in the hot air heater. May be provided.

  Moreover, in this embodiment, although the example which employ | adopted the rectification | straightening member 22 provided with the said extension piece 28 and the overhang | projection part 29 was shown, both the extension piece 28 and the overhang | projection part 29 have attachment space, , Can be selectively provided according to 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 ... Inlet, 5 ... Throat part, 7 ... Mixing pipe part, 11 ... Flame hole, 12 ... Gas ejection nozzle, 22 ... Rectification member, 23 ... Upper wall board, 24 ... Hole part, 26 ... Side wall plate, 28 ... extension piece, 29 ... overhang part.

Claims (4)

A gas injection nozzle faces in the axial direction and sucks the primary air together with the fuel gas, and a mixed gas of the fuel gas and the primary air is connected to the suction port through a throat portion having a smaller flow cross-sectional area than the suction port. In a burner device comprising a mixing pipe section to be generated and a flame hole that forms a flame with the mixed gas generated in the mixing pipe section,
A rectifying member is provided at a position between the suction port and the gas ejection nozzle,
The rectifying member is located above the suction port axis and extends in a direction crossing a part of the suction port, and extends downward from a part of the lower edge of the upper wall plate. A burner device comprising: a side wall plate located on both sides or any one side of the axis of the mouth and facing a part of the suction port.   The lower wall of the upper wall plate located on the axis side of the suction port, the side edge of the side wall plate located on the axis side of the suction port, and the lower edge of the side wall plate include the suction port. The burner device according to claim 1, further comprising an extending piece extending toward the surface.   The burner device according to claim 1, wherein the rectifying member includes a plate-like overhanging portion that covers an upper portion between the suction port and the upper wall plate.   The burner apparatus according to any one of claims 1 to 3, wherein the upper wall plate includes a hole through which primary air toward the suction port can pass.

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