JP2004144423A - Liquid fuel combustor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid fuel combustor capable of promoting shortening of a height size of the device, and capable of respectively rotating a fan of a blower and a vaporizing tube at optimum rotational frequencies. <P>SOLUTION: A burner 10 is provided with a combustion disk 15 formed with a combustion chamber 11 in an interior, the vaporizing tube 39 arranged in the combustion chamber 11, a motor 47 for the vaporizing tube rotating the vaporizing tube 39, the blower 14 supplying air into the vaporizing tube 39, and a combustion control part 17 controlling combustion in the combustion chamber 11. The blower 14 comprises the fan F, and a motor 47 for the blower rotating the fan F. The combustion control part 17 is provided so that it can control each drive of the motor 47 for the vaporizing tube and the motor 51 for the blower, and by this, each rotational frequency of the vaporizing tube 39 and the fan F is controlled in response to a burning capacity in vaporizing combustion. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a liquid fuel combustion device, and more specifically, can promote a reduction in height of the device, and can rotate a fan and a carburetor of a blower at optimal rotation speeds. The present invention relates to a liquid fuel combustion device.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as a liquid fuel combustion device used for a water heater or the like, for example, a liquid fuel combustion device disclosed in Japanese Utility Model Publication No. 1-4022 is known. This liquid fuel combustion device includes a combustion plate that internally forms a combustion chamber in which fuel such as kerosene burns, a vaporizing cylinder provided substantially at the center of the combustion disk, and a liquid provided below the vaporizing cylinder. A scattering ring that scatters fuel into the combustion chamber, a blower that is disposed below the vaporizing cylinder and supplies air into the vaporizing cylinder, and rotates a fan of the blower and the vaporizing cylinder through a common rotation shaft. And a motor.
[0003]
In this liquid fuel combustion apparatus, liquid fuel is scattered into a combustion chamber from a gap between the vaporizing cylinder and the scattering ring by rotation of the vaporizing cylinder, and spray combustion is performed by igniting the liquid fuel. By heating the vaporizing cylinder with the combustion heat, the liquid fuel in the vaporizing cylinder is vaporized, and the vaporized fuel is mixed with air supplied from the blower into the vaporizing cylinder to form the air-fuel mixture on the combustion plate. Vaporized combustion is performed by ejecting the fuel into the combustion plate from the flame hole.
[0004]
[Problems to be solved by the invention]
However, in the liquid fuel combustion device, since the vaporizing cylinder and the fan are configured to be rotated by a single motor, the blower must be disposed below the vaporizing cylinder. This is a factor for increasing the size. Further, since the vaporizing cylinder and the fan cannot be rotated at different rotational speeds, there is a case where appropriate rotation control cannot be performed on the vaporizing cylinder and the fan. For example, if the rotation frequency of the vaporization cylinder is synchronized with the drive frequency of the oil supply pump that supplies liquid fuel into the vaporization cylinder, combustion failure during combustion may occur. It is necessary to rotate the vaporizing cylinder at a rotational speed other than that. However, in this case, the fan cannot rotate at a rotation speed synchronized with the drive frequency of the oil feed pump, and an optimum rotation speed of the fan may not be set. When the combustion amount is increased, the rotation speed of the fan must be increased. However, the rotation speed of the vaporizing cylinder also inevitably increases, and the amount of heat transferred to the vaporizing cylinder increases, and the vaporizing cylinder increases. Is excessively heated, so that it becomes impossible to maintain an appropriate vaporization efficiency. Therefore, when the amount of combustion increases, it is required that the rotation speed of the vaporizing cylinder be lower than the fan rotation speed.
[0005]
[Object of the invention]
The present invention has been devised in view of such inconvenience, and an object of the invention is to promote a reduction in the height of the device, and to optimize a fan and a vaporizing cylinder of a blower, respectively. It is an object of the present invention to provide a liquid fuel combustion device that can be rotated at a rotation speed to obtain an appropriate combustion state and can avoid excessive heating of a vaporization cylinder.
[0006]
Further, another object of the present invention is to approve the thermal deformation of members that can occur around the vaporizing cylinder even if the optimal combustion state can be maintained, and evenly distribute even when the thermal deformation occurs. It is an object of the present invention to provide a liquid fuel combustion device capable of realizing deformation and contributing to a stable combustion state.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a combustion plate in which a combustion chamber is formed, a rotatable vaporizer disposed in the combustion chamber, and a liquid fuel provided below the vaporizer to burn liquid fuel. A scatter ring that scatters indoors, and a blower that supplies air into the vaporization cylinder by rotation of a fan,
By rotating the vaporizing cylinder, the liquid fuel scattered into the combustion chamber from the gap between the vaporizing cylinder and the scattering ring is ignited to perform spray combustion, and the vaporizing cylinder is heated by the combustion heat of the spray combustion to perform the spray combustion. The liquid fuel supplied into the vaporization cylinder is vaporized, the vaporized fuel is mixed with the air supplied into the vaporization cylinder, and the mixture is ejected from a flame hole formed in the combustion plate to perform vaporization combustion. In the liquid fuel combustion device to be performed,
The vaporizing cylinder and the fan are configured to be rotatable independently of each other by separate driving devices. According to such a configuration, the layout of the blower can be set relatively freely, and it is not necessary to arrange the blower below the vaporizing cylinder. The height dimension can be made smaller than the conventional structure. Further, the rotation speed that cannot be set on the vaporization cylinder side can be set on the blower side, so that the vaporization cylinder and the fan can be rotated at the optimum rotation speed according to each situation.
[0008]
DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, it is preferable to adopt a configuration in which the respective rotation speeds of the vaporizing cylinder and the fan are controlled in accordance with the amount of combustion during combustion. With such a configuration, the rotation control of the vaporizing cylinder and the fan can be effectively performed.
[0009]
Further, it is preferable to adopt a configuration in which the rotation speed of the vaporization cylinder is controlled so as to be asynchronous with the rotation frequency of the oil supply pump that supplies the liquid fuel into the vaporization cylinder. According to such a configuration, it is possible to prevent poor combustion that occurs when the rotation frequency of the oil pump and the rotation speed of the vaporizing cylinder are synchronized without affecting the rotation of the blower.
[0010]
Further, the rotation speed of the vaporizing cylinder may be controlled to be constant regardless of the amount of combustion.
[0011]
Further, the rotation speed of the vaporizing cylinder can be controlled so as to increase as the amount of combustion during combustion increases.
[0012]
Furthermore, it is also possible to adopt a configuration in which the rotation speed of the vaporizing cylinder is controlled to be lower than the rotation speed of the fan at least at the time of combustion near the maximum. With such a configuration, when the combustion amount during combustion is small, the rotation speed of the vaporizing cylinder can be sufficiently increased to secure the heat transfer amount of the vaporizing cylinder, while when the combustion amount is large, the rotation speed of the vaporizing cylinder can be increased. Since the heat transfer amount of the vaporizing cylinder can be appropriately maintained by lowering the rotation speed of the fan, the overheating of the vaporizing cylinder, which tends to occur when the combustion amount is large, can be effectively prevented.
[0013]
Further, in the present invention, an air supply guide ring forming a predetermined air supply gap is provided on the outer peripheral side of the scattering ring, and the air supply guide ring is fixed to the combustion plate via a plurality of fixing means, It is also possible to adopt a configuration in which the fixing means are provided at positions substantially equidistant from each other. With such a configuration, even if an appropriate combustion state is obtained by controlling the rotation speed described above, thermal deformation that may occur in the air supply guide ring can be substantially equally distributed in the circumferential direction, It is possible to contribute to a stable combustion state obtained by controlling the rotation speed.
[0014]
Further, the combustion chamber is provided in a polygonal shape in a plan view, and an air supply guide ring that forms a predetermined air supply gap is provided on an outer peripheral side of the scatter ring, and the air supply guide ring includes a plurality of fixed air supply guide rings. The fixing means is fixed to the combustion plate via a means, and the fixing means is a positive multiple of the number of sides determining the polygon of the combustion chamber, and is provided at positions substantially equidistant from each other, The configuration described above can also be adopted.
[0015]
In this specification, "spray combustion" means combustion performed by igniting liquid fuel, and "vaporization combustion" is obtained by mixing liquid fuel with air after vaporizing the liquid fuel. It means that the mixture is burned.
[0016]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0017]
FIG. 1 is a schematic plan view of a burner as a liquid fuel combustion device according to the present embodiment, and FIG. 2 is a plan view of the burner with parts removed from FIG. ing. 3 is a schematic end view taken along the line XX of FIG. 1, and FIG. 4 is a partially enlarged view of FIG. In these figures, a burner 10 includes an upper structure 12 including a combustion chamber 11 having a substantially square shape in a plan view, and a combustion chamber having a bottomed container shape that supports the upper structure 12 from below and opens an upper part. Air box 13 (see FIGS. 3 and 4), a blower 14 for supplying air to a combustion air chamber 13A in the combustion air box 13, and a combustion control unit 17 for controlling combustion in the combustion chamber 11. It is comprised including.
[0018]
As shown in FIG. 4, the upper structural body 12 includes a combustion chamber outer cylinder 15 having a bottom and a substantially square cylindrical shape located on the outside, and a bottomed substantially square cylindrical shape provided inside the combustion chamber outer cylinder 15. A combustion plate 16, a gas mixture forming unit 18 located at substantially the center inside the combustion plate 16, and vaporizing a liquid fuel such as kerosene to form a mixture with air, and a lower portion of the mixture formation unit 18. And an air introduction section 19 for introducing air from the combustion air chamber 13A into the combustion chamber 11. In the present embodiment, the space formed between the combustion platen 16 and the mixture forming means 18 is the combustion chamber 11.
[0019]
The combustion chamber outer cylinder 15 includes a bottom wall 15A having a substantially square outer shape in plan view, and four side walls 15B rising upward from the outer periphery of the bottom wall 15A. In the bottom wall 15A, a first central through-hole 21 is formed in a substantially central region, and at a plurality of locations along the circumferential direction of the first central through-hole 21, in the present embodiment, at approximately 90-degree intervals in the circumferential direction. A first outer through hole 22 having a smaller diameter than the first central through hole 21 is formed.
[0020]
The combustion plate 16 is disposed inside the combustion chamber outer cylinder 15 with a gap therebetween, and the gap forms a gas chamber 24 through which the air-fuel mixture formed by the air-fuel mixture forming means 18 passes. Further, the combustion plate 16 includes a bottom wall 16A having a substantially square outer shape in plan view, and four side walls 16B rising upward from the outer periphery of the bottom wall 16A. At the center of the bottom wall 16A, a second central through hole 26 and a second outer through hole 27 are formed above the first central through hole 21 and the first outer through hole 22, respectively. Further, a large number of flame holes 29 are formed in the side wall 16B so that the air-fuel mixture from the gas chamber 24 can be injected into the combustion chamber 11, and a cylindrical member 33 is provided above the side wall 16B. ing. The tubular member 33 has an inner / outer double wall structure, and an air chamber 35 is formed therebetween. The air chamber 35 communicates with one end (upper end) of an air communication path 34 that partially branches the air passing through the air supply path 17 (see FIG. 3), and from an air supply hole 37 formed in the upper part of the air chamber 35. By blowing the air upward, dew condensation or the like on the wall surface of a heat exchanger (not shown) provided above the tubular member 33 is prevented.
[0021]
As shown in FIG. 4, the air-fuel mixture forming means 18 includes a bell-shaped vaporizing cylinder 39 having an open lower part, and a scatter ring arranged with a minute gap S1 between the lower end of the vaporizing cylinder 39. And a substantially cylindrical blower cylinder 41 supported by the formation edge region of the first center through hole 21 and having an upper end side open to the vaporization cylinder 39 side and a lower end side open to the combustion air chamber 13A side. The fuel diffuser 42 is located above the blower cylinder 41, and an oil pump 45 that supplies liquid fuel to the combustion diffuser 42 via a fuel supply pipe 44.
[0022]
The fuel diffuser 42 has a substantially cylindrical side portion 42A whose upper and lower sides are open, an outward flange portion 42B connected to the upper end of the side portion 42A, and a inverted hook-shaped portion connected to the lower end side of the side portion 42A. And a top portion 42D fixed to the upper surface side of the flange portion 42B with a small gap S2 therebetween, which can receive the liquid fuel from the fuel supply pipe 44. The vaporizing cylinder 39 and the fuel diffuser 42 are supported by a common rotating shaft 46 located at the center thereof, and are integrally rotated by driving a vaporizing cylinder motor 47 as a driving device having the rotating shaft 46 as an output shaft. It is provided as possible. At this time, the liquid fuel supplied to the receiving portion 42C of the fuel diffuser 42 is ejected from the gap S2 toward the upper portion of the inner wall 39B of the vaporizing cylinder 39 by the centrifugal force caused by the rotation.
[0023]
An air introduction portion 19 for sending air into the combustion chamber 11 includes an air supply cylinder 49 connecting the first and second outer through holes 22 and 27, an upper end open side of the air supply cylinder 49, and a scattering ring 40. And an air supply guide ring 50 that can form an air supply gap P with the scattering ring 40. The air introduction section 19 can supply the air that has passed from the blower 14 through the combustion air chamber 13A to the combustion chamber 11 through the air supply gap P through the air supply passage 49A formed by the air supply cylinder 49. .
[0024]
As shown in FIG. 3, the air supply guide ring 50 includes a lower member 55 having a substantially crank-shaped cross section, and an upper member fixed to the lower member 55 and having a substantially L-shaped cross section. 56. The lower member 55 includes a base piece 55A, an upright piece 55B directed upward from the inner peripheral edge of the base piece 55A, and a top piece 55C directed inward from the upper edge of the upright piece 55B. The member 56 includes a joining piece 56A joined to the upper surface of the top piece 55C, and a gap forming piece 56B that is directed upward from the outer peripheral edge of the joining piece 56A to form the air supply gap P with the scattering ring 40. It consists of: As shown in FIG. 1, the air supply guide ring 50 has the base piece 55A fixed to the bottom wall 16A of the combustion plate 16 using eight screws 57 each forming a fixing means. That is, in this embodiment, the combustion chamber 11 is fixed by the screw 57 which is twice the number of sides of the combustion chamber 11 which is substantially rectangular in a plan view. These screws 57 are arranged at substantially equal intervals along the circumferential direction of the base piece 55A, whereby the air supply guide ring 50 is thermally deformed by combustion heat, and the screws 57 are connected to the air supply guide ring 50. Even if a gap is formed between the bottom wall 16A of the combustion plate 16 and the bottom wall 16A, the gap is formed equally, and the air from the air supply cylinder 49, that is, the secondary air is equally dispersed in the combustion chamber 11. And the combustion state can be stably maintained. When the combustion chamber 11 has a polygonal shape in plan view, the number of the screws 57 may be a positive multiple of the number of sides thereof, and is not necessarily limited to twice.
[0025]
As shown in FIG. 1 to FIG. 3, the fan F (see FIG. 3) is rotated by the drive of the blower motor 51 as a driving device, and the combustion formed in the combustion air box 13 is started. It can be directly sent to the air chamber 13A. The blower 14 may be of an axial flow type, a centrifugal type, a mixed flow type, a cross flow type, or the like.
[0026]
The combustion control unit 17 is provided so as to be capable of independently controlling the drive of the vaporizing cylinder motor 47 and the blower motor 51 independently of each other. The combustion control unit 17 controls the rotation speeds of the vaporizing cylinder 39 and the fan F according to the amount of combustion during combustion. It can be controlled independently.
[0027]
That is, for example, as shown in FIG. 5A, the vaporizing cylinder motor 47 controls the rotation speed of the vaporizing cylinder 39 to be constant irrespective of the combustion amount, as shown in FIG. As shown in B), the drive control can be performed so that the combustion amount and the rotation speed of the carburetor 39 have a substantially proportional relationship. Further, as shown in FIG. 6 (A), it is also possible to perform drive control so that the rotation speed of the vaporizing cylinder 39 increases stepwise as the combustion amount increases. Even in this case, it is possible to adjust the heat transfer amount to the vaporizing cylinder according to the change in the combustion amount. However, compared to the case of FIG. 5B, the vaporizing cylinder motor has a simpler circuit configuration and the like. 47 can be controlled. Further, as shown in FIG. 6B, when the combustion amount is near the maximum, the rotation speed of the vaporizing cylinder can be lower than the rotation speed of the fan. Here, in each of FIGS. 5A and 5B and FIGS. 6A and 6B, the vaporizing cylinder motor 47 is asynchronous with the drive frequency of the oil pump 45 (see FIG. 4). The driving control is performed so that the vaporizing cylinder 39 is rotated at the rotation speed. That is, the vaporizing cylinder 39 rotates at a rotation speed other than a rotation speed (for example, 2460 rpm) that is an integral multiple of the drive frequency (for example, 20.5 Hz) of the oil feed pump 45.
[0028]
On the other hand, the blower motor 47 is driven and controlled so that the rotation speed of the vaporization cylinder 39 increases with an increase in the amount of combustion. In the present embodiment, for example, as shown in FIG. In such a manner, the drive is controlled such that the combustion amount and the rotation speed of the fan F are substantially proportional to each other.
[0029]
Next, the combustion operation of the burner 10 will be described with reference to FIG.
[0030]
First, when a switch (not shown) is turned on, the vaporizing cylinder motor 47 and the blower motor 51 are simultaneously driven. By the rotation of the fan F, air is supplied from the blower 14 toward the combustion air chamber 13A, and the air is supplied into the vaporization cylinder 39 through the interior of the ventilation cylinder 41 and the ventilation passage 49A. The air is supplied into the combustion chamber 11 through the air supply gap P. On the other hand, when the vaporizing cylinder motor 47 is driven, the vaporizing cylinder 39 and the fuel diffuser 42 rotate simultaneously. Then, by the operation of the oil feed pump 45, liquid fuel such as kerosene is supplied from the fuel supply pipe 44 to the receiving portion 42C of the fuel diffuser 42. The liquid fuel is ejected from the minute gap S2 formed in the fuel diffuser 42 toward the inner wall 39B of the vaporizer cylinder 39 by the rotation of the fuel diffuser 42, and further, between the vaporizer cylinder 39 and the scattering ring 40. The gas is scattered into the combustion chamber 11 from the formed gap S1. The scattered liquid fuel is ignited by a spark of an ignition device (not shown) such as an igniter extending into the combustion chamber 11, and spray combustion starts.
[0031]
When the spray combustion is started, the vaporization cylinder 39 is heated by the combustion heat, and the liquid fuel ejected to the inner wall 39B of the vaporization cylinder 39 is vaporized. Then, the vaporized fuel is mixed with the air jetted from the air jet passage 54 to form an air-fuel mixture, and the air-fuel mixture passes through the gas chamber 24 and is jetted from the flame holes 29 of the combustion platen 16 into the combustion chamber 11. Then, vaporization combustion is performed by the flame of the spray combustion that has already been generated.
[0032]
Therefore, according to such an embodiment, since the vaporizing cylinder 39 and the fan F of the blower 14 have a structure that can be independently rotated by the separate motors 47 and 51, the blower 14 is There is no need to dispose it below, and the height of the device can be reduced, and the carburetor cylinder 39 and the fan F can be rotated at optimal rotational speeds according to the amount of combustion during combustion. The effect that can be obtained.
[0033]
In each of the above embodiments, the burner 10 including the combustion chamber 11 having a substantially square shape in a plan view has been described. However, the present invention is not limited to this, and is exemplified by a substantially circular or substantially rectangular shape in a plan view. As described above, the present invention is also applicable to burners provided with other polygonal combustion chambers.
[0034]
In the above embodiment, the air supply guide rings 50 are fixed to the bottom wall 16A of the combustion plate 16 by eight screws 57. However, for example, as shown in FIG. An alternative is to apply spot welding 60 at spaced locations. In this modification, the spot welding 60 is applied on an imaginary line connecting the substantially central portions of the opposite sides constituting the combustion chamber 11, but at a position similar to the position of each screw 57 shown in the above embodiment. Spot welding may be used.
[0035]
【The invention's effect】
As described above, according to the present invention, since the vaporizing cylinder and the fan can be rotated independently of each other by a separate driving device, the height of the device can be reduced, and The vaporizing cylinder and the fan can be rotated at an optimum rotational speed according to the situation.
[0036]
Further, since the respective rotation speeds of the vaporizing cylinder and the fan are controlled in accordance with the combustion amount, the rotation control of the vaporizing cylinder and the fan can be effectively performed.
[0037]
Furthermore, since the rotation speed of the vaporization cylinder is asynchronous with the rotation frequency of the oil pump that supplies the liquid fuel into the vaporization cylinder, poor combustion can be prevented without affecting the blower side.
[0038]
Further, when fixing the air supply guide ring to the combustion plate via a plurality of fixing means, a configuration in which fixing means are arranged at positions substantially equidistant from each other, or when the combustion chamber is polygonal, In the configuration using the fixing means of an integral multiple of the number of the sides, thermal deformation that can occur in the air supply guide ring can be distributed substantially equally in the circumferential direction, and from this point, a stable combustion state is maintained. It becomes possible.
[Brief description of the drawings]
FIG. 1 is a schematic plan view of a burner according to an embodiment.
FIG. 2 is a plan view of the burner in a state where a vaporizing cylinder and a scattering ring are removed from FIG.
FIG. 3 is a schematic end view taken along line XX of FIG. 1;
FIG. 4 is a partially enlarged view of FIG. 3;
FIGS. 5A and 5B are graphs showing the relationship between the amount of combustion and the number of revolutions of a carburetor with different control methods.
6 (A) and 6 (B) are graphs showing the relationship between the amount of combustion and the number of revolutions of the vaporizing cylinder in a method different from the control method of FIG. 5;
FIG. 7 is a schematic plan view similar to FIG. 1 showing a modification.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Burner (liquid fuel combustion apparatus), 11 ... Combustion chamber, 14 ... Blower, 16 ... Combustion board, 29 ... Flame hole, 39 ... Vaporization cylinder, 40 ... Scattering ring, 45: oil pump, 47: vaporizing cylinder motor (drive device), 51: blower motor (drive device), F: fan, S1: gap, 50: Air supply guide ring, 57 ... screw (fixing means)

Claims (8)

A combustion plate in which a combustion chamber is formed; a rotatable vaporizer disposed in the combustion chamber; a scatter ring provided below the vaporizer to scatter liquid fuel into the combustion chamber; and rotation of a fan. A blower that supplies air into the vaporization cylinder by
By rotating the vaporizing cylinder, the liquid fuel scattered into the combustion chamber from the gap between the vaporizing cylinder and the scattering ring is ignited to perform spray combustion, and the vaporizing cylinder is heated by the combustion heat of the spray combustion to perform the spray combustion. The liquid fuel supplied into the vaporization cylinder is vaporized, the vaporized fuel is mixed with the air supplied into the vaporization cylinder, and the mixture is ejected from a flame hole formed in the combustion plate to perform vaporization combustion. In the liquid fuel combustion device to be performed,
The liquid fuel combustion device according to claim 1, wherein the vaporizing cylinder and the fan are rotatably provided independently of each other by separate driving devices. 2. The liquid fuel combustion apparatus according to claim 1, wherein each rotation speed of the vaporizing cylinder and the fan is controlled according to a combustion amount during combustion. 3. The liquid fuel combustion apparatus according to claim 1, wherein the rotation speed of the vaporization cylinder is controlled to be asynchronous with a rotation frequency of an oil feed pump that supplies liquid fuel into the vaporization cylinder. 4. 4. The liquid fuel combustion apparatus according to claim 1, wherein the rotation speed of the vaporization cylinder is controlled to be constant regardless of the amount of combustion. 4. The liquid fuel combustion apparatus according to claim 1, wherein the rotation speed of the vaporization cylinder is controlled so as to increase as the amount of combustion during combustion increases. 6. The liquid fuel combustion apparatus according to claim 1, wherein the rotation speed of the vaporizing cylinder is controlled to be lower than the rotation speed of the fan at least at the time of combustion near the maximum. . An air supply guide ring that forms a predetermined air supply gap is provided on the outer peripheral side of the scattering ring, the air supply guide ring is fixed to the combustion plate via a plurality of fixing means, and the fixing means are mutually connected. The liquid fuel combustion device according to any one of claims 1 to 6, wherein the liquid fuel combustion device is provided at substantially equally spaced positions. The combustion chamber is provided in a polygonal shape in a plan view, and an air supply guide ring that forms a predetermined air supply gap is provided on the outer peripheral side of the scattering ring, and the air supply guide ring includes a plurality of fixing means. The fixing means is fixed at a positive multiple of the number of sides that determine the polygon of the combustion chamber, and is provided at positions substantially equidistant from each other. The liquid fuel combustion device according to any one of claims 1 to 6, wherein

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