JP3635009B2 - 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 to a liquid fuel combustion apparatus capable of preventing a flame during vaporization combustion from being lifted or blown off by air from a feed cylinder that sends air into a combustion chamber. .
[0002]
[Prior art]
A known liquid fuel combustion apparatus used for a water heater or the like is provided in a combustion chamber for burning kerosene or the like as fuel and a central portion of the combustion chamber as disclosed in, for example, Japanese Utility Model Publication No. 63-24328. A vaporizing cylinder and a cylindrical feeding cylinder that is provided at the bottom of the combustion chamber and feeds air into the combustion chamber, and is formed at a lower portion of the vaporizing cylinder by supplying liquid fuel to the inside of the vaporizing cylinder. The fuel is ejected from the gap and ignited, and the vaporized fuel in the vaporized cylinder heated by this is mixed with air, and is vaporized and combusted by being ejected from the flame hole through the gas chamber into the combustion chamber. Are known. Here, in the liquid fuel combustion apparatus, the combustion chamber has a substantially flat shape having a longitudinal direction and a short direction in a plan view, and the feed cylinder is in the short direction side, that is, in a plan view. The structure arranged in parallel along the long side wall of the combustion board along a longitudinal direction is employ | adopted.
[0003]
[Problems to be solved by the invention]
However, in the liquid fuel combustion apparatus disclosed in the Japanese Utility Model Publication No. 63-24328, since the feed cylinder is arranged along the long side wall of the combustion disc, the air supplied from the feed cylinder to the combustion chamber The amount is biased toward the short side, causing a disadvantage that the flame ejected from the flame hole on the long side wall is lifted or blown off in some cases.
[0004]
In addition, since the feed cylinder is located in the gas chamber serving as a gas mixture passage for performing vaporization combustion, the presence of the feed cylinder becomes a resistance and obstructs the flow of the gas mixture during vaporization combustion, A predetermined amount of air-fuel mixture cannot be ejected from the flame holes of the combustion disk formed on the long side wall located in the short direction. Therefore, the flame ejected from the long side wall is reduced, and the vaporization cylinder cannot be heated sufficiently, resulting in inconvenience that the supplied fuel cannot be completely vaporized.
[0005]
OBJECT OF THE INVENTION
The present invention has been devised by paying attention to such inconveniences, and its object is generated from the long side wall along the longitudinal direction in plan view when air is supplied into the combustion chamber through the feed cylinder. It is an object of the present invention to provide a liquid fuel combustion apparatus that can prevent a flame from being lifted or blown out.
[0006]
Another object of the present invention is to sufficiently supply the air-fuel mixture toward the side wall on the long side, enlarge the flame ejected from the flame hole formed in the side wall near the vaporizing cylinder, and An object of the present invention is to provide a liquid fuel combustion apparatus that can sufficiently perform heating.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the present invention is provided with a substantially flat combustion chamber having a longitudinal direction and a short direction in a plan view, and a liquid fuel that is provided at a lower portion of a vaporization cylinder disposed in the combustion chamber. A scattering ring that scatters into the chamber, an air supply guide ring that is arranged to form an air supply gap between the scattering ring, and a gas chamber that is formed outside the combustion chamber and that is A plurality of feed cylinders for supplying air into the combustion chamber through an air gap, igniting the liquid fuel scattered from the vaporization cylinder to the combustion chamber to perform spray combustion, and heating the vaporization cylinder with the combustion heat of the spray combustion In the liquid fuel combustion apparatus for vaporizing combustion by vaporizing the liquid fuel supplied into the vaporizing cylinder and ejecting the vaporized fuel from the flame holes of the combustion plate forming the combustion chamber,
The flow passage cross-sectional area of the feed cylinder located on the short side of the combustion chamber is set to be smaller than the flow passage cross-sectional areas of the feed cylinders at other portions. According to such a configuration, it is possible to reduce the amount of air supplied into the combustion chamber from the air supply gap on the short side in the combustion chamber. Accordingly, during vaporization combustion, the lift of the flame or the blow-off of the flame that is blown out from the flame hole on the combustion side wall on the short side, that is, the long side wall, by the air supplied into the combustion chamber from the air supply gap through the supply cylinder Can be prevented.
[0008]
The present invention also provides a substantially flat combustion chamber having a longitudinal direction and a short direction in a plan view, and scattering that is provided in a lower portion of a vaporization cylinder disposed in the combustion chamber and that disperses liquid fuel into the combustion chamber. An air supply guide ring disposed so as to form an air supply gap between the ring and the scattering ring, and a gas chamber formed outside the combustion chamber and being disposed in the combustion chamber through the air supply gap. A plurality of cylinders for supplying air to the gas cylinder, igniting the liquid fuel scattered from the vaporization cylinder to the combustion chamber, performing spray combustion, and heating the vaporization cylinder with the combustion heat of the spray combustion In a liquid fuel combustion apparatus for vaporizing and burning a liquid fuel supplied into a cylinder, and evaporating the vaporized fuel from a flame hole of a combustion disc forming the combustion chamber,
There is also adopted a configuration in which the outer shape of the feed cylinder located on the short side of the combustion chamber is set smaller than the outer shape of the feed cylinder at the other part. According to such a configuration, the air-fuel mixture flows smoothly in the short direction in the gas chamber, and a large flame is ensured from the side wall of the combustion plate on the short side, that is, the flame hole on the long side wall. be able to. Therefore, it becomes difficult to be affected by the air supplied into the combustion chamber through the air supply gap, and flame lift and blowout can be prevented. In addition, such a large flame also sufficiently heats the vaporizing cylinder.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
The present invention has a configuration in which a flow passage cross-sectional area of a sending cylinder located on the short side of the combustion chamber is set smaller than a flow passage cross-sectional area of a sending cylinder in another portion, and a short side of the combustion chamber It is also possible to employ a configuration in which the flow passage cross-sectional area of the feed cylinder located at the position is set to be smaller than the flow passage cross-sectional area of the feed cylinder of other parts, thereby combining the above-described functions and effects. It will be possible to demonstrate.
[0010]
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.
[0011]
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.
[0012]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
[0013]
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. ing.
[0014]
The combustion section 11 includes a bottomed cylindrical combustion chamber outer cylinder 14 positioned outside, a bottomed square cylindrical combustion disk 15 provided inside the combustion chamber outer cylinder 14, and an inner side of the combustion disk 15. A bell-shaped vaporization cylinder 16 provided substantially in the center, and a spatter that is disposed below the vaporization cylinder 16 so as to form a fine gap C1 between the vaporization cylinder 16 and enables liquid fuel to be scattered. An air supply guide ring 19 that forms an air supply gap S between the ring 18 and the scattering ring 18, and an ignition device 20 that extends in the vicinity of the vaporizing cylinder 16 are provided. Here, the internal space of the combustion plate 15 excluding the vaporizing cylinder 16 functions as a combustion chamber 22 for burning liquid fuel. The combustion chamber 22 has a substantially rectangular shape having a longitudinal direction and a short direction in plan view. It has become.
[0015]
A blower cylinder 24 extending toward the inside of the vaporization cylinder 16 is connected to a substantially center of the bottom wall 14A of the combustion chamber outer cylinder 14. A tubular feed cylinder 23 for supplying air to the feed gap S through the bottom wall 14 </ b> A of the combustion chamber outer cylinder 14 and the bottom wall 15 </ b> A of the combustion disc 15 is vaporized on the outer peripheral side of the base of the blower cylinder 24. Air is fed into the blower cylinder 24 and the feed cylinder 23 by the blower 12 disposed below.
[0016]
As shown in FIG. 4, the feed cylinders 23 are provided at eight locations around the vaporization cylinder 16 at substantially equal intervals in a gas chamber to be described later. Among these feed cylinders 23, the feed cylinders 23 located on the short side, that is, the two feed cylinders 23 and 23 located closest to the respective long side walls 15B and 15B are the other six feed cylinders. The outer shape and the channel cross-sectional area are set smaller than the cylinder 23. In other words, the inner and outer diameter dimensions of the two feeding cylinders 23 located on the shortest direction side are set smaller than the other feeding cylinders 23.
[0017]
The combustion plate 15 includes the bottom wall 15A, a long side wall 15B along the longitudinal direction in plan view, and a short side wall 15C along the short side in plan view. The bottom wall 15A and the side walls 15B and 15C are disposed with a gap slightly inward 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. The gas chamber 25 is configured to allow gas to pass therethrough. Further, a plurality of flame holes 26A, 26B, and 26C that allow the air-fuel mixture from the gas chamber 25 to be ejected into the combustion chamber 22 are formed in the bottom wall 15A and the side walls 15B and 15C, respectively. In order to make the drawing easy to see, only some of the flame holes 26A to 26C are shown in FIG. 1, and all of the flame holes are omitted in FIG.
[0018]
The vaporizing 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 is opened, and a fuel diffuser to which liquid fuel is supplied from a fuel supply pipe 32 on the inner upper side. 33 is provided. The vaporizing cylinder 16 and the fuel diffuser 33 are supported by a common rotating shaft 35 and are rotatably provided by a motor 36 connected to the rotating shaft 35.
[0019]
The fuel diffuser 33 is provided with a liquid fuel receiving portion 33A on the lower end side thereof, and receives the liquid fuel from the fuel supply pipe 32 by the receiving portion 33A. A fine gap C <b> 2 is formed between the upper end of the fuel diffuser 33 and the vaporizing cylinder 16, so that when the fuel diffuser 33 rotates together with the vaporized cylinder 16, The liquid fuel can be ejected to the outside through the gap C2.
[0020]
The blower 12 is configured such that the fan 38 can be rotated by driving the motor 36 described above, and the outside air sucked by the rotation of the fan 38 can be sent into the vaporizing cylinder 16. 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.
[0021]
Next, the operation of the burner 10 according to the present embodiment will be described.
[0022]
First, when a switch (not shown) is turned on, the motor 36 is driven, the fan 38 of the blower 12 is rotated to start supplying air to the combustion unit 11 side, and the vaporizing cylinder 16 and the fuel diffuser 33 are simultaneously rotated. . Then, the liquid fuel is supplied from the fuel supply pipe 32 to the receiving portion 33 </ b> A of the fuel diffuser 33. The supplied liquid fuel is ejected from the fine gap C2 formed between the upper end of the fuel diffuser 33 and the vaporizing cylinder 16 by the rotation of the fuel diffuser 33, and further, propagates along the inner periphery of the vaporizing cylinder 16. Liquid fuel is scattered into the combustion chamber 22 through a gap C <b> 1 formed between the scattering ring 18. The scattered liquid fuel is ignited by the ignition device 20 and spray combustion is performed.
[0023]
When spray combustion starts, the vaporizing cylinder 16 is heated by the combustion heat, 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 from each flame hole 26 </ b> A to 26 </ b> C of the combustion plate 15. Vaporization combustion is performed by the flame of the spray combustion which has been ejected into the combustion chamber 22 and has already occurred.
[0024]
The air from the blower 12 is directly supplied to the combustion chamber 22 through the air supply gap S, thereby lowering the flame temperature in the combustion chamber 22 and generating amount of nitrogen oxides (NOx) generated by combustion. And the air-fuel ratio can be partially adjusted. At this time, the inner diameter dimension of the sending cylinder 23 in the portion closest to the long side wall 15B is made smaller than that in the other portion and the flow passage cross-sectional area is set to be small, so that the vaporizing cylinder 16 is opposed to this. The amount of air ejected from the air supply gap S through the air supply cylinder 23 is suppressed relative to the region of the combustion chamber 22 between the central portion of the long side wall 15B and the other regions. The amount of air with respect to the flame formed inside is reduced, and flame lift and blowout are prevented.
[0025]
Further, since the outer diameter of the feed cylinder 23 closest to the long side wall 15B is made small and the external shape is set small, the gas chamber 25 is directed in the short side, that is, toward the long side wall 15B. The air-fuel mixture flowing in this way is not subject to much resistance by the feed cylinder 23, and a large amount of air-fuel mixture is ejected from the central portion of the long side wall 15B. Accordingly, the flame generated in the central portion becomes large, and it is difficult to be affected by the air from the air supply gap S through the supply cylinder 23, thereby preventing the flame from being lifted or blown out. Furthermore, since the flame in the said area | region which becomes the vicinity of the vaporization cylinder 16 becomes large, the heating of the vaporization cylinder 16 at the time of vaporization combustion is also performed effectively.
[0026]
In addition, in the said Example, although the external shape and flow-path cross-sectional area of two feeding cylinders 23 were made smaller than the other sending cylinders 23, this invention is not restricted to this, At least the said external shape or flow-path cross-sectional area It is sufficient to make either one smaller than the other cylinders 23. In short, the present invention provides the outer shape or flow path of the feed cylinder 23 on the short side so that the lift and blowout of the flame formed by the air-fuel mixture ejected from the flame hole 26B of the long side wall 15B can be prevented. As long as the cross-sectional area is reduced, various forms can be adopted.
[0027]
Further, the arrangement of the feed cylinders 23 is not necessarily limited to eight, and may be arranged more or less than that. For example, as shown in FIG. 5, in the case of being arranged at six equal intervals, the outer shape and the flow path cross-sectional area of a total of four feeding cylinders 23 at two locations on one side close to the long side wall 15B. It can be exemplified that it is smaller than the other two feeding cylinders 23.
[0028]
Further, it is not necessary to make the feeding cylinder 23 cylindrical as in the above-described embodiment, and it may be, for example, a rectangular tube. Further, the feed cylinder located on the short side may be cylindrical, and the feed cylinders at other parts may be rectangular. In short, it is sufficient that the feed cylinder 23 has a flow path through which air from the blower 12 can pass and that does not hinder the flow of the air-fuel mixture flowing in the gas chamber 25.
[0029]
In addition, 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.
[0030]
【The invention's effect】
As described above, according to the present invention, the flow passage cross-sectional area of the feed cylinder located on the short side in the plan view is set smaller than the flow passage cross-sectional areas of the feed cylinders of other portions. It is possible to reduce the amount of air supplied into the combustion chamber from the air supply gap on the short side. Therefore, during vaporization combustion, the air supplied into the combustion chamber from the air supply gap prevents the lift of the flame that blows out from the side wall of the combustion disk on the short side, that is, the flame hole on the long side wall, or the blow-off of the flame. It becomes possible.
[0031]
In addition, since the outer shape of the feed cylinder located on the short side of the combustion chamber is set smaller than the outer shape of the feed cylinder of the other part, the air-fuel mixture tends to flow in the short direction in the gas chamber. A large flame can be secured from the side hole. This makes it less susceptible to the influence of air supplied into the combustion chamber through the air supply gap. From this point, it is possible to prevent the flame from being lifted and blown out, and the vaporization cylinder is sufficiently heated by the formation of a large flame. You can also
[Brief description of the drawings]
FIG. 1 is a schematic perspective view of a burner according to an embodiment.
FIG. 2 is a schematic plan view of FIG.
3 is a cross-sectional view taken along the line AA in FIG.
FIG. 4 is a schematic plan view of a combustion disc.
FIG. 5 is a schematic plan view of a combustion plate of a burner according to a modification.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Burner (liquid fuel combustion apparatus), 15 ... Combustion board, 15B ... Long side wall, 15C ... Short side wall, 16 ... Vaporization cylinder, 18 ... Scattering ring , 19 ... Air supply guide ring, 22 ... Combustion chamber, 23 ... Cylinder, 25 ... Gas chamber, 30 ... Cylinder, 26A, 26B, 26C ... Flame hole, S ... Air supply gap

Claims (3)

A substantially flat combustion chamber having a longitudinal direction and a short direction in plan view, a scattering ring provided at a lower portion of a vaporization cylinder disposed in the combustion chamber, and for scattering liquid fuel into the combustion chamber, and the scattering ring A plurality of air supply guide rings arranged so as to form an air supply gap, and a plurality of air supply guide rings arranged in a gas chamber formed outside the combustion chamber and supplying air into the combustion chamber through the air supply gap And is supplied to the vaporization cylinder by igniting the liquid fuel scattered from the vaporization cylinder into the combustion chamber to perform spray combustion, and heating the vaporization cylinder with the combustion heat of the spray combustion. In a liquid fuel combustion apparatus for vaporizing and burning a liquid fuel, and evaporating the vaporized fuel from a flame hole of a combustion disc forming the combustion chamber,
The liquid fuel combustion apparatus according to claim 1, wherein a flow passage cross-sectional area of a feed cylinder located on a short side of the combustion chamber is set to be smaller than a flow passage cross-sectional area of a feed cylinder of another portion. A substantially flat combustion chamber having a longitudinal direction and a short direction in plan view, a scattering ring provided at a lower portion of a vaporization cylinder disposed in the combustion chamber, and for scattering liquid fuel into the combustion chamber, and the scattering ring A plurality of air supply guide rings arranged so as to form an air supply gap, and a plurality of air supply guide rings arranged in a gas chamber formed outside the combustion chamber and supplying air into the combustion chamber through the air supply gap And is supplied to the vaporization cylinder by igniting the liquid fuel scattered from the vaporization cylinder to the combustion chamber to perform spray combustion, and heating the vaporization cylinder with the combustion heat of the spray combustion. In a liquid fuel combustion apparatus for vaporizing and burning a liquid fuel, and evaporating the vaporized fuel from a flame hole of a combustion disc forming the combustion chamber,
The liquid fuel combustion apparatus according to claim 1, wherein an outer shape of the feed cylinder located on the short side of the combustion chamber is set smaller than an outer shape of the feed cylinder of another portion. 3. The liquid fuel combustion apparatus according to claim 2, wherein a flow path cross-sectional area of a feed cylinder located on a short side of the combustion chamber is set smaller than a flow path cross-sectional area of a feed cylinder of another portion. .

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