JP4098463B2 - Liquid fuel combustion equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a liquid fuel combustion apparatus, and more particularly, a liquid fuel that suppresses the amount of air jetted from the side wall portion side along the substantially longitudinal direction in a plan view among the side wall portions of the combustion chamber at the start of spray combustion. The present invention relates to a combustion apparatus.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as a liquid fuel combustion apparatus used for a water heater or the like, a burner having a combustion chamber having a substantially circular shape in plan view is known. However, such a burner has a disadvantage that heat transfer to the heat exchanger becomes insufficient when the heat exchanger arranged around the burner has a substantially rectangular shape in plan view. Therefore, in order to improve such inconvenience, the present applicant has proposed a burner 50 in which the combustion chamber has a substantially flat shape, that is, a substantially rectangular shape in plan view, as illustrated in FIGS. Application No. 2000-180041). The burner 50 is provided on the outer side of the combustion chamber outer cylinder 52, a bottomed cylindrical combustion disk 53 provided inside the combustion chamber outer cylinder 52 with a gap therebetween, and substantially in the center of the combustion disk 53. The vaporization cylinder 55 formed, a scattering ring 56 provided below the vaporization cylinder 55 with a minute gap C therebetween, an ignition device 57 extending in the vicinity of the vaporization cylinder 55, and air inside the vaporization cylinder 55 And a blower 58 to be supplied. Here, the internal space of the combustion disc 53 excluding the vaporizing cylinder 55 functions as a combustion chamber 60 for burning liquid fuel. Further, the gap formed between the combustion chamber outer cylinder 52 and the combustion disk 53 becomes a gas chamber 62 through which the air-fuel mixture obtained by mixing the liquid fuel vaporized inside the vaporization cylinder 55 and the air from the blower 58 passes. . In addition, a hole 63 is formed in the approximate center of the bottom wall 53 </ b> A of the combustion disk 53, and this hole 63 allows the air-fuel mixture from the inside of the vaporizing cylinder 55 to pass through the gas chamber 62. It has become. Furthermore, a large number of flame holes 65A, 65B, 65C are formed in the bottom wall 53A of the combustion plate 53, the long side wall 53B along the longitudinal direction in plan view, and the short side wall 53C along the short side. The air-fuel mixture that is formed and passes through the gas chamber 62 from these flame holes 65 </ b> A to 65 </ b> C is ejected into the combustion chamber 60.
[0003]
When the liquid fuel is supplied from the fuel supply pipe 67 into the rotating vaporization cylinder 55, the burner 50 is directed toward the combustion chamber 60 from the gap C between the vaporization cylinder 55 and the scattering ring 56. Spray combustion is performed by igniting the scattered liquid fuel by the ignition device 57. Then, the vaporizing cylinder 55 is heated by the combustion heat of this spray combustion, whereby the liquid fuel inside the vaporizing cylinder 55 is vaporized. The vaporized liquid fuel is mixed with air ejected from the blower cylinder 69 connected to the blower 58 into the vaporization cylinder 55. This air-fuel mixture is ejected from the flame holes 65A to 65C of the combustion disc 53 into the combustion chamber 60 through the gas chamber 62, and vaporization combustion is performed by the spray combustion flame.
[0004]
[Problems to be solved by the invention]
However, in the burner 50, the combustion chamber 60 has a substantially rectangular shape in plan view, so that the spray combustion flame formed in the vicinity of the vaporizing cylinder 55 is easily diffused, and the inside of the vaporizing cylinder 55 There is a problem that it takes time to vaporize the liquid fuel. That is, at the start of spray combustion, the liquid fuel in the vaporizing cylinder 55 is not yet vaporized, and the air from the blower 58 is ejected from the flame holes 65A to 65C through the gas chamber 62 without containing fuel. Will be. However, the area near the vaporizing cylinder 55 in the long side wall part 53B of the combustion chamber 60 is near the vaporizing cylinder 55 in the long side wall part 53B because the distance from the blower cylinder 69 is shorter than the short side wall part 53C. The amount of air ejected from the flame hole 65B in the region increases, and as a result, the spray combustion flame formed in the vicinity of the vaporizing cylinder 55 is diffused. As a result, there is a problem that the vaporization cylinder 55 is difficult to be heated, the vaporization of the liquid fuel supplied to the vaporization cylinder 55 is prevented from being accelerated, and it takes time to shift from spray combustion to vaporization combustion.
[0005]
OBJECT OF THE INVENTION
The present invention is a further improvement in view of the previously proposed structural problems, and its purpose is to prevent the diffusion of flames during spray combustion formed in the vicinity of the vaporization cylinder, from vapor combustion to vaporization combustion. An object of the present invention is to provide a liquid fuel combustion apparatus that can shorten the transition time to.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention ignites and sprays liquid fuel scattered in a combustion chamber from a vaporization cylinder provided in a substantially flat combustion chamber having a longitudinal direction and a short direction in a plan view. By performing combustion and heating the vaporization cylinder with the combustion heat of this spray combustion, the liquid fuel in the vaporization cylinder was vaporized, and the vaporized fuel was formed outside the bottomed cylindrical combustion disk. A liquid fuel combustion apparatus for performing vaporization combustion by ejecting into a combustion disk from a number of flame holes formed in a side wall of the combustion disk through a gas chamber,
The gas chamber has a configuration in which a baffle member that obstructs the flow of air that passes during spray combustion in a generally short direction is provided. According to such a configuration, the baffle member inhibits the flow of the air that passes during spray combustion in a substantially short direction in a plan view, so that the flame hole formed in the side wall portion along the longitudinal direction in the plan view of the combustion chamber Among these, the amount of air at the time of spray combustion ejected from the flame hole located in the vicinity of the vaporization cylinder into the combustion chamber can be reduced, and the diffusion of the flame of the spray combustion formed around the vaporization cylinder can be prevented. Accordingly, the vaporization cylinder can be heated in a short time at the start of spray combustion, and the vaporization of the liquid fuel inside the vaporization cylinder can be promoted to shorten the transition time from spray combustion to vaporization combustion.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
In this invention, it is good also as a structure which can arrange the flow direction of the air which passes the said baffle member at the time of spray combustion in a substantially longitudinal direction.
[0008]
In the present specification, “spray combustion” means combustion performed by igniting liquid fuel, and “vaporization combustion” refers to an air-fuel mixture obtained by mixing vaporized liquid combustion with air. It means the combustion performed by igniting.
[0009]
Further, in this specification, the “flat shape” is used as a concept including shapes exemplified by a rectangular shape in plan view, an elliptical shape, an oval shape, a rhombus shape, a cognate shape, and the like. It is used as a concept excluding shapes such as a circular shape and the same n-square shape.
[0010]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
[0011]
FIG. 1 is a schematic perspective view of a burner as a liquid fuel combustion apparatus according to this embodiment, and FIG. 2 is a schematic plan view of FIG. 3 is a cross-sectional view taken along line AA in FIG. In these drawings, the burner 10 includes a combustion unit 11 that burns liquid fuel such as kerosene, and a blower 12 that is provided below the combustion unit 11 and supplies air to the combustion unit 11. .
[0012]
The combustion section 11 is provided at the outer side of the bottomed combustion chamber outer cylinder 14 located on the outer side, the bottomed cylindrical combustion disk 15 provided inside the combustion chamber outer cylinder 14, and the substantially inner center of the combustion disk 15. The bell-shaped vaporizing cylinder 16 is provided, a scattering ring 18 provided below the vaporizing cylinder 16, and an ignition device 20 extending in the vicinity of the vaporizing cylinder 16. Here, the internal space of the combustion disc 15 excluding the vaporizing cylinder 16 functions as a combustion chamber 22 for burning liquid fuel, and the combustion chamber 22 has a substantially rectangular shape having a longitudinal direction and a short direction in plan view. ing.
[0013]
A blower cylinder 24 extending toward the inside of the vaporization cylinder 16 is connected to a substantially center of the bottom wall 14 </ b> A of the combustion chamber outer cylinder 14, and air from the blower 12 connected to the lower side of the blower cylinder 24 is supplied to the vaporization cylinder 16. It can be sent to the inside. The combustion disc 15 is disposed with a gap slightly inwardly from the bottom wall 14A and the peripheral wall 14B of the combustion chamber outer cylinder 14, and this gap is a mixture of vaporized liquid fuel and air as will be described later. The gas chamber 25 passes through. The combustion plate 15 includes a bottom wall 15A, a long side wall 15B along the longitudinal direction of the plan view, and a short side wall 15C along the short side of the plan view. A large number of flame holes 26A, 26B, and 26C are formed in the side wall portions 15B and 15C, respectively. Each of the flame holes 26 </ b> A to 26 </ b> C is provided so that the air-fuel mixture from the gas chamber 25 can be ejected into the combustion chamber 22. In FIGS. 1 and 3, it should be understood that the description of each of the flame holes 26 </ b> A to 26 </ b> C is partially or wholly omitted in order to avoid complication of the drawings. Further, a hole 27 through which the air blowing cylinder 24 passes and an air-fuel mixture or the like from the inside of the vaporizing cylinder 16 is fed into the gas chamber 25 is formed substantially at the center of the bottom wall 15A of the combustion plate 15.
[0014]
The gas chamber 25 has a baffle member that hinders the flow of the air A that passes during spray combustion between the bottom wall 15A of the combustion disc 15 and the bottom wall 14A of the combustion chamber outer cylinder 14 in a generally short direction in plan view. The baffle plate 28 is partially provided. As shown in FIG. 2, the baffle plate 28 is provided in a curved shape having an arc shape substantially along the outer peripheral surface of the vaporizing cylinder 16, and the air blowing cylinder 24 in the gas chamber 25 and each of the long sides. A pair is provided between the side wall portions 15B and 15B. Further, the upper and lower ends of the baffle plate 28 are connected to the bottom walls 15A and 14A, respectively, as shown in FIG. 3, and the air A traveling from the inside of the vaporizing cylinder 16 to the baffle plate 28 through the blower cylinder 24 is The outer side, that is, the long side side wall portion 15B is prevented from flowing directly. In this embodiment, the baffle plate 28 has an arcuate curved shape. However, the baffle plate 28 has a linear shape as long as the flow of the air A passing during spray combustion is obstructed, that is, the flow path resistance can be imparted. Other plate-like bodies such as extending shapes, or other baffle members such as block shapes can also be used.
[0015]
The vaporization cylinder 16 is disposed with a gap with respect to the bottom wall 15A of the combustion disk 15 in a direction in which the lower part opens, and a fuel to which liquid fuel is supplied from a fuel supply pipe 32 is provided on the inner upper side thereof. A diffuser 33 is provided. The vaporizing cylinder 16 and the fuel diffuser 33 are supported by a common rotating shaft 35 and can be rotated together by a motor 36 connected to the rotating shaft 35. The fuel diffuser 33 is provided with a liquid fuel receiving portion 33A on the lower end side thereof, and the liquid fuel from the fuel supply pipe 32 is once received by the receiving portion 33A. Note that a fine gap C1 is formed between the upper end of the fuel diffuser 33 and the vaporizing cylinder 16, so that when the fuel diffuser 33 rotates, the liquid fuel inside the fuel diffuser 33 becomes a gap. It is designed to spray outward through C1. The scattering ring 18 is disposed on the lower side of the vaporizing cylinder 16 with a minute gap C2 therebetween, and the liquid fuel in the vaporizing cylinder 16 can be ejected toward the combustion chamber 22 from the gap C2. .
[0016]
Although the detailed structure of the blower 12 is omitted here, when a switch (not shown) is turned on, the fan 38 is rotated by driving the motor 36 and the sucked air can be directly sent into the vaporizing cylinder 16 or the like. ing. The blower is not limited to the above-described axial flow type, but may be a centrifugal type, a diagonal flow type, or a cross flow type. In the present embodiment, the fan 38 and the vaporizing cylinder 16 are rotationally driven by the common motor 36, but each may be rotated by a separate motor.
[0017]
Next, the operation of the burner 10 according to the present embodiment will be described.
[0018]
First, when a switch (not shown) is turned on, the motor 36 is driven, the fan 38 of the blower 12 is rotated, the supply of air to the combustion unit 11 side is started, and the vaporizing cylinder 16 and the fuel diffuser 33 are simultaneously rotated. To do. Then, by the rotation of the fuel diffuser 33, the liquid fuel supplied from the fuel supply pipe 32 to the receiving portion 33A of the fuel diffuser 33 is ejected from a minute gap C1 formed between the upper end of the fuel diffuser 33 and the vaporizing cylinder 16. Then, the gas is scattered into the combustion chamber 22 through a gap C2 formed between the vaporizing cylinder 16 and the scattering ring 18 along the inner circumference. The scattered liquid fuel is ignited by the ignition device 20 and spray combustion starts. At the start of spray combustion, since the liquid fuel inside the vaporizing cylinder 16 has not yet been vaporized, the air A supplied from the blower 12 remains as it is inside the vaporizing cylinder 16 as indicated by the one-dot chain line in FIG. The gas flows through the gas chamber 25 and ejects from each of the flame holes 26A to 26C. At this time, the air A flowing into the gas chamber 25 is obstructed by the baffle plate 28 in a substantially short direction in plan view, and the flow direction of the air A is adjusted to a substantially longitudinal direction as shown by a broken line in FIG. It is done. For this reason, the flow rate of the air A toward the generally short direction in plan view is smaller than the flow rate of the air A toward the approximately longitudinal direction, and the distance from the blower cylinder 24 in the long side wall portion 15B in the combustion plate 15. The amount of air A ejected from the flame hole 26 </ b> B formed in the short region is smaller than that in the prior art.
[0019]
The vaporizing cylinder 16 is heated by the combustion heat of the spray combustion, and the liquid fuel inside the vaporizing cylinder 16 is vaporized. The vaporized fuel is mixed with the air supplied from the blower 12 to the inside of the vaporizing cylinder 16 to become an air-fuel mixture, and the air-fuel mixture passes through the gas chamber 25 through the flame holes 26 </ b> A to 26 </ b> C of the combustion plate 15. Evaporation combustion is performed by the spray combustion flame which has been ejected to 22 and has already occurred. Here, at the time of vaporization combustion, the liquid fuel inside the vaporization cylinder 16 is vaporized by the combustion heat.
[0020]
Therefore, according to such an embodiment, at the start of spray combustion, the spray combustion flame formed around the vaporizing cylinder 16 is diffused by the air A from the flame hole 26B formed in the long side wall portion 15B. Instead, the vaporizing cylinder 16 can be heated in a short time. As a result, it is possible to promote the vaporization of the liquid fuel in the vaporizing cylinder 16 and to accelerate the transition from the spray combustion to the vaporized combustion.
[0021]
In the above embodiment, the shape of the combustion chamber 22 is a substantially rectangular shape in plan view. However, the present invention is not limited to this, and the shape of the combustion chamber 22 is not limited to this. You may apply to the burner which has the combustion chamber of the other planar view flat shape illustrated.
[0022]
4 and 5, the baffle plate 28 is connected to only one of the bottom wall 15A of the combustion plate 15 or the bottom wall 14A of the combustion chamber outer cylinder 14, and the lower or upper side May be penetrable. In addition, the baffle plate 28 has a band shape when viewed from the front, but may also have a comb shape, a mesh shape, or a porous shape. In short, various shapes of baffle plates can be employed in the gas chamber 25 below the combustion plate 15 as long as a predetermined resistance can be given to the flow of the air A in a generally short direction in plan view.
[0023]
Furthermore, the configuration of each part of the apparatus according to the present invention is not limited to the illustrated configuration example, and various modifications are possible as long as substantially the same operation is achieved.
[0024]
【The invention's effect】
As described above, according to the present invention, since the baffle member that obstructs the flow in the substantially short direction of the air that passes during spray combustion is provided in the gas chamber, the side wall portion along the substantially longitudinal direction in a plan view of the combustion chamber. The amount of air ejected from the side into the combustion chamber can be reduced, the diffusion of the spray combustion flame formed around the vaporization cylinder 16 can be prevented, and the transition time from spray combustion to vaporization combustion can be shortened can do.
[Brief description of the drawings]
FIG. 1 is a schematic perspective view of a burner in an embodiment.
FIG. 2 is a schematic plan view of FIG.
3 is a longitudinal sectional view taken along line AA in FIG.
4 is a partial enlarged cross-sectional view according to a modified example in which the arrangement of baffle plates is changed with respect to the burner of FIG. 1;
5 is a partially enlarged cross-sectional view according to another modification of FIG.
FIG. 6 is a schematic sectional front view of a burner according to a conventional example.
FIG. 7 is a schematic plan view of a burner according to a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Burner (liquid fuel combustion apparatus), 15 ... Combustion board, 16 ... Vaporization cylinder, 22 ... Combustion chamber, 25 ... Gas chamber, 26B ... Flame hole, 26C ... -Flame hole, 28 ... baffle plate (baffle member)

Claims (2)

The liquid fuel scattered in the combustion chamber is ignited from a vaporization cylinder provided in a substantially flat combustion chamber having a longitudinal direction and a short direction in a plan view, and spray combustion is performed. By heating the vaporization cylinder, the liquid fuel in the vaporization cylinder is vaporized, and the vaporized fuel passes through a gas chamber formed outside the bottomed cylindrical combustion disk to the side wall portion of the combustion disk. A liquid fuel combustion apparatus for performing vaporization combustion by ejecting into a combustion disk from a number of formed flame holes,
The liquid fuel combustion apparatus according to claim 1, wherein the gas chamber is provided with a baffle member that inhibits the flow of air that passes during spray combustion in a substantially short direction. The liquid fuel scattered in the combustion chamber is ignited from a vaporization cylinder provided in a substantially flat combustion chamber having a longitudinal direction and a short direction in a plan view, and spray combustion is performed. By heating the vaporization cylinder, the liquid fuel in the vaporization cylinder is vaporized, and the vaporized fuel passes through a gas chamber formed outside the bottomed cylindrical combustion disk to the side wall portion of the combustion disk. A liquid fuel combustion apparatus for performing vaporization combustion by ejecting into a combustion disk from a number of formed flame holes,
The gas chamber is provided with a baffle member for adjusting the flow direction of air passing during spray combustion in a substantially longitudinal direction.

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