JP4258632B2 - Combustion equipment - Google Patents

Description

  The present invention relates to a combustion apparatus using a liquid fuel, and more particularly to an apparatus for improving combustibility and reducing running cost.

  In hot water heaters, heaters, and the like, in order to reduce running costs, combustion apparatuses that use inexpensive liquid fuel such as kerosene are frequently used. Patent Document 1 discloses a combustion apparatus that uses such a liquid fuel. The combustion apparatus disclosed in Patent Document 1 is used as a so-called normal combustion type that ejects a flame upward and a so-called reverse combustion type that ejects a flame downward.

  FIG. 18 is a cross-sectional view showing the structure of the vaporization unit 500 of the combustion apparatus disclosed in Patent Document 1. As shown in FIG. In this example, the vaporizing unit 500 has a configuration in which a rotating member 504 is rotatably accommodated inside a bottomed cylindrical vaporizing chamber 502, and is provided at the center of the combustion unit 501. An electric heater 503 is built in the bottom of the vaporizing chamber 502, and the inner wall of the vaporizing chamber 502 can be heated. The rotating member 504 is a member in which a stirring blade is formed around the disk, and is fixed to the rotating shaft 505 and rotated at a high speed by a motor (not shown). Further, a fuel pipe 506 is disposed on the rotating member 504.

  During combustion, the electric heater 503 is energized to heat the vaporizing chamber 502, the rotating member 504 is rotated by a motor (not shown), and air is supplied from the primary air introduction cylinder 507 to the inside of the vaporizing chamber 502, while the fuel pipe Kerosene is injected from 506 to the rotating member 504. Then, the kerosene injected to the rotating member 504 is scattered toward the inner wall of the vaporizing chamber 502 by centrifugal force, is vaporized by receiving heat from the heated inner wall of the vaporizing chamber 502, and the vaporized fuel is a primary air introduction cylinder. The air is mixed with the air supplied from 507 into the vaporizing chamber 502. And this mixed gas is sent to the combustion part 501 from the upper opening 508, and is used for combustion. In other words, in this type of combustion apparatus, liquid energy is vaporized by giving thermal energy while giving kinetic energy to the liquid fuel.

By the way, in the combustion apparatus disclosed in Patent Document 1, as shown in FIG. 19, the combustion section 501 is formed in a rectangular shape in accordance with the shape of a hot water supply apparatus or the like in which the combustion apparatus is built, and a vaporization section is formed at the center thereof. The structure provided with 500 is adopted. Thus, the fuel gas amount ejected from the combustion unit 501 is ensured to increase the maximum combustion amount.
JP 2002-327908 A

  However, as described above, the combustion apparatus disclosed in Patent Document 1 has a structure in which the vaporization unit 500 is arranged at the center of the rectangular combustion unit 501, so that the fuel from the vaporization unit 500 to each part of the combustion unit 501 is used. The gas flow path lengths differ greatly, the amount of fuel gas supplied to each part of the combustion unit 501 tends to be uneven, and the flame tends to be unbalanced.

  Further, the flame hole member 511 constituting the combustion part 501 has a structure in which a large number of flame holes 510 are arranged in a portion protruding in a bowl shape in a direction away from the flame hole base 509, and the flame hole member 511 is a flame hole. The combustion part 501 was formed by being mounted on the base 509. For this reason, the space between the flame ejected from the flame hole 510 and the flame hole base 509 is large, the recovery rate of the heat generated by the flame to the flame hole base 509 side is reduced, and it takes time to raise the temperature of the flame hole base 509. Was necessary. For this reason, it is necessary to energize the electric heater 503 for a long time from the start of combustion in order to prevent the re-liquefaction of the fuel gas flowing through the flame hole base 509, which increases power consumption and cannot reduce the running cost. It was.

  Further, since the fuel gas flow path leading to the flame hole member 511 is lengthened, the opening area of the flame hole 510 is increased to reduce the flow resistance, so that the flame is directed toward the fuel gas flow path side of the flame hole base 509. A separate member for preventing the so-called backfire that travels is required, resulting in an increase in manufacturing cost.

  This invention is proposed in view of the said situation, and it aims at providing the combustion apparatus which aimed at reduction of running cost and manufacturing cost, ensuring the stable combustion.

  The invention according to claim 1, which is proposed to achieve the above object, has a vaporizing section for generating a fuel gas by vaporizing a liquid fuel, and the generated fuel gas or a mixed gas of fuel gas and air is used. In the combustion apparatus that is sent to the combustion unit and combusts, at least a part of the vaporization unit is disposed so as to be exposed to the combustion unit, and the combustion unit includes a flame hole base including a fuel gas flow path that communicates with the vaporization unit, Composed of a flame hole member equipped with a flame hole base and having a plurality of flame holes for ejecting fuel gas or mixed gas flowing in the fuel gas flow path, the flame hole base and the flame hole member of the combustion part are vaporized parts It is set as the structure formed in the substantially regular polygonal shape more than the hexagon centering on.

  According to the present invention, since the flame hole base and the flame hole member are formed in a substantially regular polygonal shape having a hexagonal shape or more centered on the vaporization part, the flame holes are uniformly arranged around the vaporization part so as to surround the vaporization part. Can be arranged. This makes it possible to equalize the fuel gas flow path length from the vaporization section to the flame hole as compared with the configuration in which the vaporization section is provided in a portion where the combustion section is biased, and the mixed gas is directed from the vaporization section to the flame hole. It can be sent evenly. Thereby, the amount of fuel gas or mixed gas ejected from the flame hole becomes uniform, and stable combustion can be performed while maintaining the balance of the flame.

  In addition, since the flame holes can be arranged evenly around the vaporization part so as to surround the vaporization part, the entire vaporization part can be uniformly heated by the flame ejected from the flame hole, and the liquid fuel can be stably stabilized in the vaporization part. It becomes possible to vaporize.

Here, as a pattern for arranging the flame holes on the flame hole member, a rectangular arrangement, a circular arrangement, an arrangement in a block shape, or the like can be considered. However, the flame holes can be arranged at the highest density by arranging the flame holes having the same diameter in parallel with each side of a substantially regular polygon of hexagon or more at equal intervals.
That is, according to the present invention, the flame hole base and the flame hole member of the combustion part are formed in a substantially regular polygonal shape with a hexagonal shape or more centered on the vaporization part. When the flame holes are arranged at equal intervals, the flame holes can be arranged with the highest density, and the total opening area of the flame holes can be maximized. Thereby, the central vaporization part can be efficiently heated by the flame ejected from the flame hole, and the vaporization efficiency of the liquid fuel can be improved.

  In the present invention, when the flame hole base and the flame hole member have a regular polygonal shape of pentagon or less, the intervals between the vaporization part and the outer edge of the flame hole base and the flame hole member are greatly different around the vaporization part. It becomes difficult to arrange the flame holes evenly around. The flame hole base and the flame hole member are preferably formed in a substantially regular polygonal shape having a hexagonal shape or more. In particular, in consideration of manufacturability, it is preferable to form a substantially regular polygonal shape in a range of about hexagonal to decagonal.

  The invention according to claim 2 has a vaporizing section that vaporizes liquid fuel to generate fuel gas, and combusts the generated fuel gas or a mixed gas of fuel gas and air to the combustion section for combustion. In this case, at least a part of the vaporization part is disposed so as to be exposed to the combustion part, and the combustion part is provided with a flame hole base having a fuel gas flow path communicating with the vaporization part, and a fuel gas flow is attached to the flame hole base. The fuel gas flow path is composed of a flame hole member having a plurality of flame holes for ejecting fuel gas or mixed gas flowing through the passage, and the fuel gas flow path includes a plurality of basic flow paths that extend radially from the vaporization section side, and the basic flow path A branch flow path extending toward the adjacent main flow path side, a plurality of the branch flow paths are arranged in a direction away from the vaporization section, and fuel gas flowing through the branch flow path is ejected from the flame hole It is said that.

  According to the present invention, the basic flow path provided in the flame hole base extends radially from the vaporization section side. Therefore, the amount of fuel gas or mixed gas flowing out from the vaporization section to each basic flow path can be made substantially uniform as compared with a configuration in which the basic flow path extends from a portion where the vaporization section is biased. As a result, a substantially equal amount of fuel gas or mixed gas can be flowed from the vaporization section to the branch flow channel side via each basic flow channel, and variation in the amount of fuel gas or mixed gas ejected from each flame hole is suppressed. It becomes possible.

  In the present invention, the number of branch channels branched from each basic channel may be the same or different depending on the basic channel. If the same number of branch flow paths branch from each main flow path, the flow resistance of each main flow path becomes substantially equal, and the amount of fuel gas or mixed gas branching to each branch flow path is made more uniform. Is possible.

  In the present invention, the length of each branch channel extending from the basic channel may be the same for each basic channel or may be different. By making the length of each branch channel extending from the main channel the same for each main channel, the flow resistance of each main channel and branch channel can be made more uniform, The amount of the fuel gas or mixed gas to be made can be made more uniform.

  According to a third aspect of the present invention, in the combustion apparatus according to the second aspect, the vaporizing portion is positioned at a substantially central portion of the combustion portion, and the flame-hole-based fuel gas flow path includes the central portion of the vaporizing portion and the central portion thereof. A plurality of basic flow paths that extend radially from the vaporization section side in the direction connecting the vertices of the substantially regular polygon centered on the section, and an adjacent basic flow that is arranged in parallel to each side of the substantially regular polygon A plurality of branch flow paths communicating between the paths are provided, and a plurality of the branch flow paths are arranged in a direction away from the vaporization section.

  The present invention further limits the configuration of the fuel gas passage according to claim 2. According to the present invention, each basic flow channel extends radially from the vaporization unit side in a state where the angles formed by adjacent basic flow channels are substantially equal. Therefore, the amount of fuel gas or mixed gas flowing out from the vaporization section to each main flow path is made more uniform than the configuration in which the main flow paths extend radially in the state where the angles formed between adjacent main flow paths are different. Can do.

  In addition, since a plurality of branch channels communicate between adjacent main channels, even if there is a difference in the amount of fuel gas or mixed gas flowing in the adjacent main channels, the branch channels are uniformly connected. It becomes. As a result, the amount of the fuel gas or mixed gas ejected from the flame hole can be made more uniform.

  In the present invention, the number of branch flow paths provided between adjacent basic flow paths may all be the same, or may be different for each adjacent basic flow path. Also, the position where the branch flow path is provided may be the same for all the basic flow paths, or may be different for each adjacent basic flow path. By making all the numbers and positions of the branch flow paths provided between the adjacent basic flow paths the same, the flow resistance of each basic flow path and the branch flow paths arranged in the same part can be equalized, It becomes possible to further equalize the amount of fuel gas or mixed gas ejected from each flame hole.

  According to a fourth aspect of the present invention, in the combustion apparatus of the third aspect, the regular polygon that serves as a reference when arranging the fuel gas flow path is a substantially regular polygon that is a hexagon or more. Yes.

  When a pentagonal shape or less is employed as the regular polygon, the number of main flow paths extending from the vaporization section is small, and an unbalance is likely to occur in the amount of fuel gas or mixed gas flowing out from the vaporization section to each basic flow path. In addition, when a pentagonal shape or less is employed, it becomes difficult to arrange the flame holes evenly around the vaporization portion in accordance with the shapes of the main flow channel and the branch flow channel that form the fuel gas flow channel. For this reason, the amount of the fuel gas or mixed gas ejected from the flame hole is likely to vary, and it becomes difficult to uniformly heat the vaporization portion from the surroundings by the flame.

  The regular polygon that serves as a reference when the fuel gas flow path is arranged is preferably a regular polygon that is a hexagon or more. By adopting a hexagonal shape or more as the regular polygon, it is possible to equalize the amount of the fuel gas or mixed gas flowing out from the vaporizing section to each basic flow path. In addition, by adopting a hexagonal shape or more, it is possible to arrange the flame holes evenly around the vaporizing portion. Thereby, the variation of the flame ejected from the flame hole can be suppressed, and the vaporization part can be heated uniformly from the surroundings by the flame, so that the liquid fuel can be stably vaporized.

  In the present invention, the regular polygon serving as a reference when arranging the fuel gas flow path is preferably a regular polygon in the range of hexagonal to decagonal in consideration of manufacturability. Moreover, even if it is a regular polygon in this range, by adopting an even number of regular polygons such as hexagons, octagons, or decagons, the shapes of the flame hole member and the flame hole base can be made symmetric. Can be designed and manufactured easily. Further, since the casing of the combustion section is usually rectangular, by adopting, for example, a regular hexagon or a regular octagon as a regular polygon as a reference when arranging the fuel gas flow path, the flame hole member and the flame hole base Can be accommodated in the casing of the combustion section with the opposing parallel surfaces aligned with the wall of the casing. Thereby, it is possible to reduce the space required for storage compared to the case where a circle is adopted as a reference shape when the fuel gas flow path is arranged.

  Further, by arranging the fuel gas flow path with reference to the regular polygon as described above, the flame hole member and the flame hole base can be formed in the same regular polygon shape. Thereby, for the reason described in the first aspect, the flame holes having the same diameter can be arranged at high density at equal intervals, and the total opening area of the flame holes can be increased.

  According to a fifth aspect of the present invention, in the combustion device according to the third or fourth aspect, the flame hole-based fuel gas flow path is disposed on the surface opposite to the surface on which the flame hole member is mounted with respect to the vaporizing portion. Branch formed between ribs projecting substantially in parallel so as to bridge between the main flow passage formed radially and the main flow passage adjacent to the surface on which the flame hole member is mounted It has a flow path, and the basic flow path and the branch flow path are configured to communicate with each other through a communication portion provided in the flame hole base.

The present invention defines a specific configuration in which the fuel gas flow path is arranged in the flame hole base, and the configuration according to claim 3 or 4 can be easily implemented.
According to the present invention, the fuel gas or mixed gas that is generated in the vaporization section and flows in the main flow path flows into each branch flow path via the communication section. In other words, the fuel gas or the mixed gas flows from the basic flow channel into the branch flow channel through the communication portions located at both ends of one branch flow channel. And the fuel gas or mixed gas which flowed into the branch flow path is ejected from the flame hole of a flame hole member.

  The invention according to claim 6 is the combustion apparatus according to any one of claims 2 to 5, wherein the flame hole member is formed by providing an opening to be a flame hole in a flat plate material, When the flame hole member is mounted on the flame hole base, a large number of flame hole members are arranged along the branch flow path.

  According to the present invention, since the flame hole member is a flat plate material, the interval between the generated flame and the flame hole base is reduced, and the recovery rate of the heat generated in the flame to the flame hole base side is increased. Accordingly, the temperature of the flame hole base can be raised in a short time at the beginning of combustion, and the occurrence of re-liquefaction of the fuel gas or mixed gas flowing in the fuel gas passage is effectively prevented. As a result, the fuel gas or the mixed gas flowing in the branch channel can be stably ejected from the flame hole, and the flame can be stably combusted.

  Further, according to the present invention, the flame hole member itself has a simple structure in which an opening to be a flame hole is provided in a flat plate material, and can be manufactured very easily. In addition, by appropriately setting the inner diameter of the opening serving as a flame hole, so-called backfire in which the flame runs to the fuel gas flow path side can be effectively prevented while maintaining a stable flame. This eliminates the need for a separate mesh member for preventing backfire and further improves the productivity.

  According to a seventh aspect of the present invention, in the combustion device according to any one of the second to sixth aspects, the flame hole base and the flame hole member are penetrated between the adjacent branch flow paths of the flame hole base. The secondary air flow path is provided.

According to the present invention, since the supply of secondary air around the flame through the secondary air passage, it is possible to perform stable combustion with reduced emissions of the NO _X flame by cooling.
In the present invention, the secondary air flow path is provided between adjacent branch flow paths of the flame hole base. Therefore, the present invention is applied to the configuration according to claim 5, and the ribs forming the branch flow passages are provided with through holes, and the flame hole members are provided with through holes corresponding to the through holes, so that they are adjacent to each other. It is possible to easily form a secondary air flow path that penetrates the flame hole base and the flame hole member between the branched flow paths.

  According to an eighth aspect of the present invention, in the combustion apparatus according to any one of the first to seventh aspects, the vaporization section has an independent heat source and mainly receives heat from the heat source to raise the temperature by the preliminary heat generation section. In addition, a self-heating unit that mainly raises the temperature by receiving heat from the combustion unit is provided.

  According to the present invention, since the temperature of the self-heating unit is not raised at the beginning of the combustion operation, the liquid fuel is vaporized only by the heating of the preliminary heating unit and burns. When the combustion time elapses and the temperature of the self-heating part is increased by receiving the heat of the flame of the combustion part to reach a temperature at which the liquid fuel can be vaporized, combustion is continued by vaporization by the self-heating part alone. Thereby, it is possible to suppress the energy consumption of the preliminary heat generating part while maintaining the combustion stability in the early stage of combustion.

  In the present invention, for example, an electric heater heating method or an electromagnetic induction heating method can be adopted for the preliminary heat generating portion. The electromagnetic induction heating method can raise the temperature of the heating target in a shorter time than the electric heater heating method. Therefore, by adopting the electromagnetic induction heating method for the preliminary heat generation part, the preliminary heat generation part can be rapidly heated at the beginning of combustion to vaporize the liquid fuel in a short time, improving usability while maintaining stable combustion. It is possible to make it.

According to the first aspect of the present invention, it is possible to provide a combustion apparatus that can suppress variations in flames and can uniformly heat the vaporizing portion from the surroundings by the flames, thereby performing stable combustion.
According to the second to fourth aspects of the present invention, the dispersion of the flame can be suppressed by the appropriate arrangement of the fuel gas flow path, and the vaporization portion can be uniformly heated from the surroundings by the flame, thereby performing stable combustion. A combustion apparatus can be provided.
According to the invention described in claim 5, the configuration described in claim 3 or 4 can be easily implemented.
According to the combustion apparatus of the sixth aspect, the configuration of the flame hole member can be simplified, and another member for preventing backfire is not required, so that the productivity can be improved and the cost can be reduced. it can. Also, heat from the flame can be effectively recovered in the flame hole base, the flame hole base can be heated in a short time at the beginning of combustion, and stable combustion is prevented while preventing re-liquefaction of the fuel gas. Is possible.
According to invention of Claim 7, the combustion apparatus which performs the stable combustion which suppressed discharge | emission of noxious gas by simple structure can be provided.
According to the eighth aspect of the present invention, it is possible to provide a combustion apparatus that improves the usability and suppresses the running cost by stably vaporizing the liquid fuel.

Next, specific examples of the present invention will be described. In the following description, the upper and lower relationships are based on the state where the combustion device is installed in a hot water supply device or the like.
FIG. 1 is a perspective view showing a combustion apparatus according to an embodiment of the present invention in an inverted state. FIG. 2 is a cross-sectional view of the combustion apparatus according to the embodiment of the present invention. FIG. 3 is an exploded perspective view showing an overall component configuration of the combustion apparatus according to the embodiment of the present invention.

1 and 2, reference numeral 1 denotes a combustion apparatus according to an embodiment of the present invention (however, FIG. 1 is shown upside down). The combustion apparatus 1 of the present embodiment is built in the hot water supply apparatus 2 with the flame hole facing downward as shown in FIG. 17. As shown in FIG. 2, the blower 3, the drive machine section 5, The air amount adjusting unit 6 is laminated, and a combustion unit 7 and a vaporizing unit 8 are provided below the air amount adjusting unit 6.
The vaporization unit 8 includes an induction heat source unit 10 and a self-heating unit 11 as described later. The induction heat source unit 10 is located between the air amount adjusting unit 6 and the combustion unit 7 described above, and the self-heating unit 11 is located in the combustion unit 7.

  If it demonstrates sequentially from an upper side, the air blower 3 will arrange | position the fan 13 rotatably in the concave housing 12 made by bending a steel plate. An opening 15 is provided at the center of the housing 12.

  The drive machine unit 5 has a box 16, and a motor 18 is attached to the center of the top plate 17. As for the motor 18, the rotating shafts 20 and 21 protrude from the both ends, and the rotating shafts 20 and 21 penetrate the substantially full length of the combustion apparatus 1 in the height direction. An upper rotating shaft 20 of the motor 18 is connected to the fan 13, and a lower rotating shaft 21 is connected to the first rotating member 23 and the second rotating member 25 of the vaporizing unit 8.

  As shown in FIG. 3, the air amount adjusting unit 6 is formed by stacking a disk-shaped moving side plate member 26 on a fixed side plate member 27. The moving-side plate-like member 26 has a plurality of substantially triangular openings 30 provided radially around a central shaft insertion hole 28. The fixed side plate member 27 is provided with a shaft insertion hole 35 and an opening 33 at positions corresponding to the shaft insertion hole 28 and the opening 30 of the moving side plate member 26. The fixed side plate member 27 is provided with a large number of small holes 36 at positions where they do not overlap when the movable side plate member 26 is overlapped.

As shown in FIG. 2, when the rotary shaft 40 of the step motor 38 attached to the box 16 rotates, the air amount adjusting unit 6 swings the drive piece 37 engaged with the rotary shaft 40 and the moving plate member 26. Move. As a result, the moving side plate member 26 rotates relatively on the fixed side plate member 27 around the central shaft insertion hole 28.
The rotation of the moving plate member 26 changes the area of the opening that communicates the moving plate member 26 and the fixed plate member 27, thereby adjusting the amount of air.

  As shown in FIGS. 3, 9, and 14, the combustion section 7 is formed by a flow dividing member 41, a flame hole base 43, and a flame hole member 45, and these components are housed inside the housing 42 as shown in FIG. 2. It has been done.

FIG. 4 is a plan view of the flow dividing member 41 that forms the combustion section 7.
As shown in FIGS. 4 and 9, the flow dividing member 41 is a substantially rectangular plate-like member, and has a large opening 46 at the center. In addition, a large number of oblong openings 47, 48, and 50 are provided in the peripheral portion.
The openings 47, 48 and 50 all form a substantially octagon as shown in FIG. That is, the long hole-shaped openings 47, 48, 50 are arranged around the central opening 46 in a substantially octagonal shape. Specifically, sixteen openings 47 are arranged around the central opening 46 in a substantially octagonal shape, and sixteen openings 48 are arranged in a substantially octagonal shape on the outer side, and further 16 on the outer side. The individual openings 50 are arranged so as to surround a substantially octagonal shape.

FIG. 5 is a front view of the flame hole side of the flame hole base 43 employed in the combustion apparatus of FIG. 6 is a front view of the flow path constituting surface side of the flame hole base 43 shown in FIG. FIG. 7 is a cross-sectional perspective view of the main part of the flame hole base 43 of FIG. 5, showing the state viewed from the flame hole side upside down.
The flame hole base 43 is made of aluminum die casting and has an octagonal shape as shown in FIGS. The flame hole base 43 is provided with a complicated frame, openings and grooves. The upper surface side of the flame hole base 43 mainly functions as a flow path constituting surface of fuel gas and secondary air, and the lower surface side functions as a flame hole mounting surface.
As shown in FIGS. 2 and 5, the flame hole base 43 has an outer combustion wall 49 surrounding the outer periphery. The inside of the outer combustion wall 49 is a part where a flame is actually generated and functions as the combustion part 7.

  A large opening 52 is provided at the center of the flame hole base 43 as shown in FIGS. The opening 52 is provided to attach the vaporizing unit 8 (self-heating unit 11). Further, convex rib portions 53 and concave groove portions 54 are alternately provided in the outer combustion wall 49 as shown in FIGS. That is, each of the convex rib portions 53 is formed in an octagonal shape as shown in FIG. The convex rib portion 53 is tripled, and a concave groove portion 54 is formed between the convex rib portions 53.

  In addition, two long holes 55 are provided on each side (one side of the octagon) of the convex rib portion 53 described above. The long hole 55 passes through the front and back of the flame hole base 43. The long hole 55 functions as the secondary air channel 55.

Further, as shown in FIGS. 7 and 15, a plate-like portion 56 is provided on one surface of the flame hole base 43, and the plate-like portion 56 has a radially extending groove 62, and a part of the groove 62 is a part. An opening 57 is provided by being omitted, and the groove 62 and the recessed groove portion 54 communicate with each other through the opening 57. As shown in FIG. 15, the radially extending grooves 62, openings 57, and recessed groove portions 54 of the flame hole base 43 each form a part of the fuel gas flow channel 51. That is, the groove 62 functions as the main flow path 62 of the fuel gas flow path 51, and the concave groove portion 54 functions as the branch flow path 54 of the fuel gas flow path. Further, the opening 57 functions as a communication part 57 that communicates the basic flow path 62 and the branch flow path 54.
A temperature sensor 59 is attached to the flame hole base 43 as shown in FIG.

  FIG. 8 is a front view of the flame hole member 45. The flame hole member 45 is substantially octagonal as shown in FIG. 9, and has a large opening 58 that matches the outer shape of the self-heating portion 11 at the center. A large number of round holes 60 and small holes 61 are provided around the opening 58. It is what was done. The round hole 60 is a hole through which secondary air flows out, and the small hole 61 is a hole through which fuel gas flows out. Both of the round holes 60 and the small holes 61 are arranged in an octagon. More specifically, the opening 58 for the central self-heating portion 11 is surrounded in an octagon, and a row of round holes 60 for secondary air is arranged in an octagon. Small holes 61 for fuel gas outflow are arranged in an octagon on the outside. Further, a row of round holes 60 for outflow of secondary air and a row of small holes 61 for outflow of fuel gas continue to the outside. In this embodiment, the flame hole member 45 is made using a heat resistant stainless steel plate.

  In the present embodiment, the flame hole member 45 has the small holes 61 as the flame holes arranged in an octagon, but this is a device for arranging the flame holes at a high density to increase the total opening area of the flame holes. . As the arrangement pattern of the flame holes, it is possible to arrange them in a rectangular shape, in a circular shape, or in a block shape. However, if the flame holes are arranged in a substantially regular polygon of hexagon or more, the flame is arranged with the highest density. The holes can be arranged. In particular, when adopting a configuration in which the self-heating part 11 protrudes in the center of the combustion part as in this embodiment, it is recommended to arrange the flame holes from a regular hexagon to a regular decagon. In other words, if the flame holes are arranged from a hexagonal shape to a decagonal regular polygon, the central self-heating portion 11 can be uniformly heated while increasing the total opening area of the flame holes, and the effect of high vaporization efficiency is achieved. There is.

  In this embodiment, the small hole 61, which is a flame hole of the flame hole member 45, has an extremely small inner diameter (1 mmφ in this embodiment). As a result, the so-called backfire in which the flame ejected from the flame hole 61 runs toward the fuel gas flow path 51 can be effectively suppressed, and another net member for preventing the backfire is unnecessary.

  Further, by combining the flame hole base 45 with the flame hole base 43, the vapor hole 8 reaches the flame hole (small hole) 61 via the fuel gas flow path 51 formed by the basic flow path 62 and the branch flow path 54. The flow length of the fuel gas is made uniform over the entire circumference of the vaporization section. Therefore, as compared with the conventional rectangular flame hole base (see FIG. 19), the variation in the amount of fuel gas ejected from the flame hole 61 can be eliminated, and stable combustion with suppressed flame imbalance can be performed. It is.

FIG. 9 is an exploded perspective view of the vicinity of the flame hole base 43.
The above-described flame hole member 45 is attached to one surface (the lower surface in the use state) of the flame hole base 43 as shown in FIGS.
In the state in which the flame hole member 45 and the flame hole base 43 are coupled, as shown in FIG. 15, the fuel hole flowing out of the flame hole member 45 is directly below the branch flow path (concave groove portion) 54 of the flame hole base 43. A row of small holes 61 is located. On the other hand, as shown in FIG. 16, a row of secondary air round holes 60 of the flame hole member 45 is positioned directly below the long holes 55 provided on each side of the convex rib portion 53 of the flame hole base 43. .

As shown in FIGS. 2, 9, and 16, the flow dividing member 41 is attached to the back surface of the flame hole base 43. The large opening 46 at the center of the flow dividing member 41 communicates with the opening 52 provided at the center of the flame hole base 43. Further, the other long hole-shaped openings 47, 48, 50 of the flow dividing member 41 coincide with the positions of the long holes 55 provided on each side of the convex rib portion 53 of the flame hole base 43.
The flame hole base 43 and the flow dividing member 41 are combined in the above-described state and are disposed in the housing 42.

  Next, the vaporization unit 8 will be described. FIG. 10 is an exploded perspective view of the vicinity of the vaporizing section 8 of the combustion apparatus 1 shown in FIG. FIG. 11 is a perspective view of the fuel passage cylinder constituting the induction heating unit of the vaporization unit 8. FIG. 12 is a front view, a plan view, a left and right side view, and a bottom view of a fuel passage cylinder constituting the induction heating unit of the vaporization unit 8. FIG. 13 is a partial cross-sectional perspective view of the induction heating unit of the vaporization unit 8. FIG. 14 is a perspective view of the vicinity of the combustion unit of the combustion apparatus 1 of FIG. 2 as viewed from above. FIG. 15 is an explanatory diagram showing the flow of fuel gas. FIG. 16 is an explanatory diagram showing the flow of secondary air.

  The vaporization part 8 employ | adopted with the combustion apparatus 1 of a present Example has two types of heat sources. That is, the vaporization unit 8 employed in this embodiment includes an induction heat source unit 10 and a self-heating unit 11 as shown in FIG. A first rotating member 23 and a second rotating member 25 are provided in the vicinity of each of the heat generating units 10 and 11. An air introduction cylinder 71 for supplying appropriate primary air to the induction heat source unit 10 and the self-heating unit 11 is provided.

That is, as shown in FIG. 10, the vaporizing unit 8 includes a first rotating member 23, a donut-shaped heat insulating material 73, a fuel passage cylinder (induction heat generating portion, preliminary heat generating portion) 75, a cylindrical heat insulating material 76, a coil member 77, The first air introduction cylinder 78, the second air introduction cylinder 80, the second rotating member 25, and the self-heating unit 11 are formed.
The induction heat source unit 10 is constituted by the fuel passing cylinder 75, the cylindrical heat insulating material 76, the donut-shaped heat insulating material 73, and the coil member 77, and the first air introducing cylinder 78 and the second air introducing cylinder 80 provide air. An introduction cylinder 71 is configured.

To explain sequentially, the fuel passage cylinder 75 functions as an induction heat generating part and a preliminary heat generating part, and is a cylinder made of a material having electrical conductivity and a certain degree of electrical resistance. More specifically, the fuel passage cylinder 75 is made of a thin stainless steel material.
The fuel passage cylinder (induction heat generating portion, preliminary heat generating portion) 75 is open at both ends, but has a special shape as shown in FIGS. 10 to 12, and the shape is greatly different between the upper side and the lower side. . In other words, the region 81 on the upper half side of the fuel passage cylinder 75 has a cylindrical shape with a substantially constant diameter. The opening end (opening on the upper side) of the fuel passage cylinder 75 opens in the direction of the axis XX (see FIG. 12c) of the fuel passage cylinder 75. A flange portion 83 is formed at the opening end (upper side opening) of the fuel passage cylinder 75.

On the other hand, the region 82 on the lower side of the fuel passage cylinder 75 has a conical shape. The opening 85 on the lower side of the fuel passage cylinder 75 opens in an inclined direction with respect to the axis XX (see FIG. 12c) of the fuel passage cylinder 75 as shown in FIG.
That is, the fuel passage cylinder 75 has the lower opening 85 inclined with respect to the posture during use, and there is a difference in height at the lower opening end.
Further, the opening 85 on the lower side has its opening edge folded inward to form a bowl-shaped groove 87 inside the opening end. In other words, the inner surface of the fuel passage cylinder 75 functions as the preliminary heat generating peripheral wall 64. In this embodiment, a bowl-shaped groove 87 is formed in the lower portion of the inner surface of the fuel passage cylinder 75 as the preliminary heat generating peripheral wall 64. Structure.
An opening 88 is formed in the groove 87 at the lowest position of the opening 85. The opening 88 is specifically a small hole and is provided for collecting fuel and dropping it to the lower self-heating part 11 side.

The cylindrical heat insulating material 76 is a cylindrical body made of a material having both heat resistance and heat insulating properties. The inner diameter of the cylindrical heat insulating material 76 is equal to the outer diameter of the region 81 on the upper side of the fuel passage cylinder 75 described above. The height of the cylindrical heat insulating material 76 is equal to the length of the region 81 on the upper side of the fuel passage cylinder 75.
As described above, the cylindrical heat insulating material 76 is made of a material having both heat resistance and heat insulating properties. Specifically, glass wool, ceramic, or the like is employed.

  The donut-shaped heat insulating material 73 is disk-shaped and has a large opening at the center. The donut-shaped heat insulating material 73 is also made of a material having both heat resistance and heat insulating properties such as glass wool and ceramic.

  The coil member 77 is configured by a bobbin 90 and a coil wire 91 as shown in FIG. The bobbin 90 itself has a function as a heat insulating member, and is made of unsaturated polyester having both heat insulating properties and heat resistance. The shape of the bobbin 90 is such that flange portions 93 and 94 are provided at both ends of the cylindrical body portion 92 as shown in FIG.

  The coil wire 91 is a normal copper wire and is wound in a spiral shape. The shape of the coil wire 91 is not limited to a spiral shape, and may be, for example, a hook shape. The coil wire 91 is a litz wire, is wound around the outer periphery of the cylindrical body portion 92 of the bobbin 90, and is further hardened with silicon varnish or the like so that the coil wire 91 is not unwound. In addition, several (8 in this embodiment) ferrite guides 95 are fixed to the outer peripheral portion of the coil wire 91 in order to concentrate the magnetic field generated by energization on the fuel passage cylinder 75 to be heated.

The induction heat source unit 10 includes four members, the fuel passage cylinder 75, the cylindrical heat insulating material 76, the donut-shaped heat insulating material 73, and the coil member 77, and the cylindrical heat insulating material 76 is disposed on the outer periphery of the fuel passage cylinder 75. Further, a coil member 77 is provided on the outer periphery thereof (in FIG. 13, the cylindrical heat insulating material 76 is omitted for the purpose of drawing). Therefore, a cylindrical heat insulating material 76 and a bobbin 90 having a function as a heat insulating material are interposed between the coil wire 91 and the fuel passage cylinder 75, and the coil wire 91 and the fuel passage cylinder 75 are separated by both. Heavyly insulated.
Further, a donut-shaped heat insulating material 73 is interposed between the flange portion 83 at the opening end (upper side opening) of the fuel passage cylinder 75 and the flange portion 93 of the bobbin 90 (in FIG. 13, for the sake of drawing, The donut-shaped heat insulating material 73 is abbreviated).

The induction heat source unit 10 is provided with a temperature sensor 100 that detects the temperature of the fuel passage cylinder 75 that is a heat generating member. The temperature sensor 100 is specifically a thermistor and has a flat plate-shaped temperature detection unit 101.
In this embodiment, as shown in FIG. 13, a through hole 102 is provided in the flange portion 93 of the bobbin 90 to hold a part of the temperature sensor 100 and lead out a signal line or the like from the through hole 102. Further, a cushion material 103 is provided between the temperature detection unit 101 and the flange portion 93 of the bobbin 90, and presses the temperature detection unit 101 against the flange portion 83 of the fuel passage cylinder 75. Specifically, the cushion material 103 is a disc spring or a leaf spring made of silicon rubber or stainless steel. Alternatively, a small-diameter O-ring or the like can be used as a cushioning material.

  In other words, in this embodiment, the temperature sensor 100 is held by a bobbin 90 having a function as a heat insulating material. Furthermore, the temperature detection unit 101 receives a reaction force from the bobbin 90 having a function as a heat insulating material and is pressed against the outer surface of the fuel passage cylinder 75. Further, it is desirable to apply a paste having excellent thermal conductivity, such as silicon, on the surface of the temperature detection unit 101.

The self-heating part 11 is a cylindrical body having a bottom part 96 and a peripheral part 97, as shown in FIGS. 2, 3, and 14. The bottom part 96 is closed and the upper part is opened. That is, the self-heating part 11 has a recessed shape, the bottom 96 and the peripheral part 97 are closed, airtight and watertight, and the upper part is open.
The self-heating part 11 has the bottom part 96 and the peripheral part 97 as described above, and has a cup-like shape. As shown in FIGS. 2 and 3, the self-heating part 11 is formed at the central opening 52 part of the flame hole base 43. It is attached. The position of the self-heating portion 11 is in the center of the flame hole base 43, is surrounded by the flame holes (small holes) 61 and is located close to the combustion part 7. Moreover, most of the self-heating part 11 is exposed to the combustion part 7 side. More specifically, the entire bottom portion 96 of the self-heating portion 11 and most of the peripheral portion 97 are exposed to the combustion portion 7 side. Therefore, as will be described later, the self-heating unit 11 is beaten and heated from the outside by a flame generated from the flame hole (small hole) 61 during combustion. As a result, the inner peripheral surface (self-heating peripheral wall) 66 and the back surface portion 67 of the self-heating portion 11 are heated to raise the temperature.
A temperature sensor 115 is embedded in the self-heating unit 11 (FIG. 2).

  In order to efficiently vaporize the liquid fuel inside the fuel passage cylinder 75, the first rotating member 23 makes the liquid fuel (used in this embodiment kerosene) injected from the fuel pipe 116 into fine particles, and the fuel passage cylinder (Induction heat generating portion, preliminary heat generating portion) The air is scattered toward the preliminary heat generating peripheral wall 64 of 75, and the vaporized fuel gas and primary air are agitated and mixed uniformly.

  On the other hand, the second rotating member 25 is for scattering the liquid fuel dropped from above toward the self-heating peripheral wall 66 of the self-heating unit 11 and stirring and mixing the fuel gas and the primary air.

As shown in FIG. 10, the first air introduction cylinder 78 and the second air introduction cylinder 80 constitute an air introduction cylinder 71.
The first air introduction cylinder 78 is formed by bending a thin plate, and includes an outer flange portion 127, a cylindrical portion 128, and an inner flange portion 129 as shown in FIG. That is, the outer flange portion 127 is at one open end of the cylindrical portion 128. The outer flange portion 127 is positioned on the upper side when in use.
The cylindrical portion 128 has an inner diameter larger than the outer diameter of the induction heat source unit 10 described above, and the inner diameter is slightly reduced on the distal end side in the air flow direction.

An inner flange portion 129 is provided on the front end side of the air flow of the cylindrical portion 128.
On the other hand, the second air introduction cylinder 80 has a conical shape. The opening at the top of the second air introduction cylinder 80 is equal to the diameter of the opening 130 at the tip of the first air introduction cylinder 78 described above. Moreover, the opening diameter of the lower part of the 2nd air introduction cylinder 80 is smaller than the opening diameter of the above-mentioned self-heating part 11. FIG.
The first air introduction cylinder 78 and the second air introduction cylinder 80 are overlapped to form a series of air flow paths. A packing (not shown) is interposed at the joint portion of the first air introduction cylinder 78.

The vaporization unit 8 has the induction heat source unit 10 and the self-heating unit 11 as described above. The induction heat source unit 10 is located between the air amount adjusting unit 6 and the combustion unit 7, and the self-heating unit 11 is located in the combustion unit 7.
As described above, the vaporizing unit 8 includes the first rotating member 23, the donut-shaped heat insulating material 73, the fuel passage cylinder 75, the cylindrical heat insulating material 76, the coil member 77, the first air introduction cylinder 78, and the second air introduction cylinder 80. The second rotating member 25 and the self-heating unit 11 are all arranged side by side on the same axis. That is, the fuel passage cylinder 75, the cylindrical heat insulating material 76, the donut-shaped heat insulating material 73, and the coil member 77 are provided in the air introduction cylinder 71 constituted by the first air introduction cylinder 78 and the second air introduction cylinder 80. The induction heat source unit 10 is arranged, and the central axis of the air introduction cylinder 71 coincides with the central axis of the induction heat source unit 10.

The self-heating unit 11 is provided below the air introduction tube 71 and the induction heat source unit 10, and the tip of the air introduction tube 71 is open toward the opening (back side) of the self-heating unit 11. Further, a fuel passage cylinder (induction heat generating part, preliminary heat generating part) 75 constituting the induction heat source part 10 is also opened toward the back side of the self-heating part 11.
The first rotating member 23 is located inside the induction heat source unit 10, and the second rotating member 25 is located inside the self-heating unit 11. More specifically, the first rotating member 23 is in the fuel passage cylinder (preliminary heat generating portion) 75 constituting the induction heat source unit 10 and is located in a space surrounded by the preliminary heat generating peripheral wall 64. The second rotating member 25 is located in a space surrounded by the self-heating peripheral wall 66 of the self-heating unit 11.

Further, a fuel pipe 116 is inserted into the induction heat source unit 10, and the fuel pipe 116 reaches the upper portion of the first rotating member 23 as shown in FIG.
More specifically, the fuel pipe 116 hangs straight from the upper opening of the induction heat source unit 10 and reaches the upper portion of the first rotating member 23 from above. Then, liquid fuel such as kerosene is dropped from the fuel pipe 116 onto the disc body (plate body) 23 a of the first rotating member 23.

  In addition, the induction heat source unit 10 has the groove 87 inclined to the opening 85 as described above, and the opening 87 is formed in the groove 87, and the opening 88 is located above the second rotating member 25. . That is, the opening 88 is in the upper part near the center of the second rotating member 25.

Next, the assembly structure of each part of the combustion apparatus 1 of the present embodiment will be described.
The combustion apparatus 1 according to the present embodiment includes a blower 3, a drive machine unit 5, an air amount adjustment unit 6, and a vaporization unit 8, which are sequentially stacked with their central axes aligned with each other. The blower 3 is directly screwed. In other words, in this embodiment, the rotation center of the blower 3, the shaft insertion holes 28 and 35 of the air amount adjusting unit 6, and the central axis of the vaporizing unit 8 are linearly arranged on the same axis. In addition, since the components of the vaporizing unit 8 itself are also arranged side by side in the same axis, the rotation center of the blower 3, the shaft insertion holes 28 and 35 of the air amount adjusting unit 6, and the central axis of the vaporizing unit 8 are arranged. On the other hand, the rotation center axes of the two rotating members 23 and 25 of the vaporizing section 8 also coincide.

  An air amount adjusting unit 6 is screwed to the upper part of the driving machine unit 5. A vaporization unit 8 is located below the air amount adjustment unit 6. In other words, the larger opening of the air introduction cylinder 71 is attached to the center of the air amount adjusting unit 6 via a packing.

The central axis of the air introduction cylinder 71 coincides with the shaft insertion holes 28 and 35 of the moving side plate-like member 26 and the fixed side plate-like member 27 of the air amount adjusting unit 6, and the air introduction cylinder 71 is the center side of the fixed-side plate-like member 27. It will be located so as to cover the area. Therefore, the air discharged from the area on the center side of the air amount adjusting unit 6 is captured by the air introduction cylinder 71.
In addition, the induction heat source section 10 is provided in the air introduction cylinder 71 as described above, and the induction heat source section 10 has a fuel passage cylinder 75 at the center and communicates with the upper and lower sides. The air discharged from the area is captured by the air introduction cylinder 71 and is divided into air flowing through the fuel passage cylinder 75 at the center and air flowing around the induction heat source section 10.

That is, since there is a fuel passage cylinder 75 in the air introduction cylinder 71, a part of the air passes through the fuel passage cylinder 75 and reaches the self-heating unit 11.
Further, since an annular space 131 is provided between the inner surface of the air introduction cylinder 71 and the outer periphery of the induction heat source unit 10, the remaining air enters the self-heating unit 11 directly through the space 131.
The air that has entered the air introduction cylinder 71 contributes to combustion as primary air regardless of which route is taken.

The rotating shaft 21 of the motor 18 of the drive machine unit 5 communicates with the central shaft insertion holes 28 and 35 of the air amount adjusting unit 6 and passes through the air introduction cylinder 71 and the induction heat source unit 10. To the inside.
The rotating shaft 21 of the motor 18 is engaged with the first rotating member 23 in the induction heat source unit 10, more specifically in the fuel passage cylinder 75. The rotating shaft 21 of the motor 18 is engaged with the second rotating member 25 inside the self-heating unit 11.
That is, the rotating shaft 21 of the motor 18 of the drive machine unit 5 has a tip portion engaged with the second rotating member 25 and an intermediate portion engaged with the first rotating member 23. The first rotating member 23 is located in the fuel passage cylinder 75 of the induction heat source unit 10, and the second rotating member 25 is located in the self-heating unit 11, both of which are rotated by the motor 18.

Further, since the rotating shaft 20 on the rear end side of the motor 18 is also connected to the fan 13, in this embodiment, the two rotating members 23 and 25 of the vaporizing unit 8 and the three of the fan 13 are operated by the single motor 18. Is driven.
Since the shaft insertion holes 28 and 35 are also the rotation center of the moving side plate member 26, they do not move when the moving side plate member 26 rotates. Therefore, even if the shaft insertion holes 28 and 35 have the rotation shaft 21 of the motor 18, the rotation of the moving side plate member 26 is not hindered.

The combustion apparatus 1 of the present embodiment is used with the flame hole facing downward. Hereinafter, the mounting direction of the combustion apparatus 1 will be described.
FIG. 17 is a piping system diagram of a hot water supply device 2 that employs the combustion device 1 shown in FIG. 2.
The combustion apparatus 1 of a present Example is used for the hot water supply apparatus 2 like FIG. And the combustion apparatus 1 is installed in the upper part of the can 136 in which the heat exchanger 135 was incorporated, and generates a flame toward the lower heat exchanger 135.

  As shown in FIG. 17, the hot water supply device 2 includes a heat exchanger 135, a flowing water circuit 141, and a heat exchanger 135 for exchanging heat between the combustion device 1 of this embodiment and the combustion gas generated in the combustion device 1 and a heat medium such as hot water. The fuel supply unit 142 is configured. The flowing water circuit 141 includes an inflow side channel 143 that supplies hot water from the outside, and an outflow side channel 145 that flows out the hot water heated in the heat exchanger 135 to the outside. The inflow side channel 143 is connected to the water inlet 146 of the heat exchanger 135, and the outflow side channel 145 is connected to the water outlet 147 of the heat exchanger 135.

  In the middle of the inflow side channel 143, a flow rate sensor 150 and an incoming water temperature sensor 151 are provided. The flow rate sensor 150 detects the amount of hot water supplied via the inflow side flow path 143. When the flow rate sensor 150 detects a predetermined amount of water, the combustion device 1 starts an ignition operation. The incoming water temperature sensor 151 detects the temperature of hot water supplied from the outside.

The outflow side channel 145 supplies hot hot water heated by heat exchange with the combustion gas in the heat exchanger 135 to the hot water tap 152. In the middle of the outflow side flow path 145, a temperature sensor 153, a stirring unit 154, a water amount adjustment valve 155, and a tapping temperature sensor 156 are provided. The water amount adjustment valve 155 regulates the total amount of hot water discharged from the hot water tap 152 by opening and closing the flow path of the outflow side flow path 145.
Further, the temperature sensor 153 detects the temperature of hot hot water heated in the heat exchanger 135.

  The stirring unit 154 is provided at a connection portion between the outflow side channel 145 and a bypass channel 158 described later. In the stirring unit 154, the hot hot water heated in the heat exchanger 135 and the relatively low temperature hot water flowing in via the bypass channel 158 are mixed. A hot water temperature sensor 156 is provided on the downstream side of the stirring unit 154. The hot water temperature sensor 156 detects the temperature of the hot water stirred in the stirring unit 154.

The inflow side channel 143 and the outflow side channel 145 are bypassed by a bypass channel 158. The end of the bypass channel 158 on the outflow side channel 145 side is connected to the agitation unit 154 described above. A bypass flow rate adjustment valve 159 is provided in the middle of the bypass flow path 158. The bypass flow rate adjustment valve 159 adjusts the amount of water flowing into the stirring unit 154.
In addition, a can body temperature sensor 160 is provided in the vicinity of the heat exchanger 135 or in the flow path in the heat exchanger 135, and an air temperature sensor 161 that measures the outside air temperature (intake air temperature) in the vicinity of the intake port of the combustion apparatus 1. Is provided. Further, the hot water supply device 2 is provided with a freeze prevention sensor 162.

Next, the function of the combustion apparatus 1 of the present embodiment will be described.
In the combustion apparatus 1 of the present embodiment, the motor 18 is activated to rotate the fan 13, the first rotating member 23, and the second rotating member 25.
With the rotation of the fan 13, air is sucked from the opening 15 provided in the central portion of the housing 12 of the blower 3 as indicated by the arrow in FIG. The air flows from the drive machine unit 5 to the vaporization unit 8 and the combustion unit 7 through the upper air amount adjustment unit 6. In this embodiment, the flow rate is adjusted by the air amount adjustment unit 6. That is, the amount of air flowing to the vaporization unit 8 and the combustion unit 7 side is adjusted by operating the step motor 38 and rotating the moving side plate member 26 relative to the fixed side plate member 27 to change the opening area. The

  The air that has passed through the air amount adjusting unit 6 is divided into one that contributes to combustion as primary air and one that contributes to combustion as secondary air. In other words, the air that has passed through the central area of the air amount adjusting unit 6 is directly captured by the air introduction cylinder 71, a part of which enters the fuel passage cylinder 75 and is mixed with the fuel gas, and the remaining part is directly Into the self-heating part 11 is mixed with fuel gas.

  Further, as shown in FIG. 14, the remaining portion of the blast flows across the flame hole base 43 from the elongated holes 47, 48, and 50 provided in a row in the flow dividing member 41, and the round holes 60 of the flame hole member 45. To the combustion section 7.

As described above, a large amount of primary air is introduced into the vaporization unit 8 by the blower 3 so that the inside of the fuel passage cylinder 75 of the induction heat source unit 10 and the self-heating unit 11 are ventilated.
A high-frequency current is supplied to the coil wire 91 of the induction heat source unit 10 from a high-frequency inverter (not shown), and the fuel passage cylinder 75 of the induction heat source unit 10 is heated by high-frequency induction heating.

That is, when a high-frequency current is passed through the coil wire 91, a variable magnetic field is generated inside the coil, and the magnetic field lines that fluctuate the fuel passage cylinder 75 placed in the variable magnetic field penetrate. Here, since the fuel passage cylinder 75 is made of stainless steel as a magnetic material and has conductivity, an eddy current is generated inside the fuel passage cylinder 75. As described above, since the fuel passage cylinder 75 is made of stainless steel and has a considerable electric resistance, the fuel passage cylinder 75 generates heat due to Joule heat caused by eddy current.
The heat generated by high frequency induction heating has high thermal efficiency and rises quickly. Therefore, the temperature of the fuel passage cylinder 75 is raised in an extremely short time compared to the case where a conventional electric heater is used, and reaches a temperature at which the liquid fuel can be vaporized.

In this embodiment, when the fuel passage cylinder 75 is heated by high frequency induction heating, the coil wire 91 is devised so as not to increase the temperature.
That is, when the coil wire 91 for induction heating is provided inside the combustion apparatus 1 as in the present embodiment, the coil wire 91 is heated by the internal heat, which may cause a disconnection or the like. Therefore, in this embodiment, the coil wire 91 is devised so as not to be heated excessively.
That is, in this embodiment, the coil wire 91 is wound around the bobbin 90. However, the bobbin 90 is made of resin and does not generate heat because it is not conductive. The bobbin 90 is made of unsaturated polyester having heat insulation and heat resistance. Therefore, the bobbin 90 functions as a heat insulating material and does not transmit the heat of the fuel passage cylinder 75 to the coil wire 91.

Further, a heat insulating material (cylindrical heat insulating material 76) that does not generate heat and has excellent heat insulating properties is interposed between the bobbin 90 and the fuel passage cylinder 75.
The fuel passage cylinder 75 has a flange portion 83, and a donut-shaped heat insulating material 73 and a flange portion 93 of the bobbin 90 exist between the flange portion 83 and the coil wire 91, and the temperature of the coil wire 91 is increased. Is preventing.
Further, in this embodiment, since the primary air flows outside the induction heat source unit 10 as will be described later, the coil wire 91 is also cooled by the primary air.

As described above, the coil wire 91 is energized, the fuel passage cylinder 75 is heated by high frequency induction heating, and the entire inner wall of the fuel passage cylinder 75 is heated. In this state, kerosene is dropped from the fuel pipe 116 onto the first rotating member 23.
The dropped kerosene receives a centrifugal force from the first rotating member 23 and scatters toward the preliminary heat generating peripheral wall 64 of the fuel passage cylinder (induction heat generating portion, preliminary heat generating portion) 75. The first rotating member 23 employed in the present embodiment is formed by extending the stirring blades radially from the outer edge of the plate body that rotates integrally with the rotary shaft extending in the vertical direction. A plurality of parts are provided along the outer periphery of the body over the entire circumference, and are inclined by a predetermined angle with respect to the plate body.

Therefore, the liquid fuel sprayed on the surface of the plate body of the first rotating member 23 flows on the surface of the plate body by centrifugal force, and partly flows along the surface of the inclined stirring blade and from the tip of the stirring blade. It scatters toward the preliminary heat generating peripheral wall 64 of the fuel passage cylinder 75.
Therefore, if the tip of the stirring blade is positioned in the rotational axis direction (vertical direction) with respect to the plate body, the liquid fuel can be dispersed and scattered from the portion located above or below the plate body. In addition, the thermal energy of the inner peripheral wall of the vaporization part can be efficiently added to the scattered liquid fuel to promote vaporization.

Then, the scattered kerosene comes into contact with the inner surface of the fuel passage cylinder 75 disposed around the first rotating member 23 and is vaporized by receiving heat. At this time, the kerosene that has come into contact with the fuel passage cylinder 75 is almost 100% vaporized, and no kerosene remains without being vaporized.
Further, as described above, a part of the air trapped in the air introduction cylinder 71 passes through the inside of the fuel passage cylinder 75, so that the fuel vaporized by receiving heat from the inner surface of the fuel passage cylinder 75 passes through the fuel passage cylinder 75. Mixed with passing air.

Here, in this embodiment, the first rotating member 23 is provided with a stirring blade, and the air in the fuel passage cylinder 75 is stirred by the stirring blade, and the mixing of the fuel gas and the air is promoted.
In the present embodiment, since the fuel passage cylinder 75 is cylindrical, the scattered fuel and the vaporized fuel continue to be heated while passing through the cylindrical portion. In other words, in this embodiment, since the preliminary heat generating portion is cylindrical, the temperature of the fuel is raised when the fuel passes through the cylindrical portion. For this reason, the combustion apparatus of this embodiment has a long contact distance and contact time between the fuel and the heating element, which not only ensures the vaporization of the fuel, but also the temperature of the vaporized fuel gas is high.

The mixed gas thus generated passes through the fuel passage cylinder 75 and enters the self-heating unit 11.
On the other hand, as described above, the remaining portion of the air trapped in the air introduction tube 71 passes through the space 131 formed between the inner surface of the air introduction tube 71 and the outer periphery of the induction heat source unit 10, and thus the self-heating unit. Enter 11.
In this embodiment, a rotating member is also provided in the self-heating unit 11. In other words, in this embodiment, the rotating member is provided in two stages, and the second rotating member 25 as one of them rotates in the self-heating unit 11. Therefore, the mixed gas of fuel gas and air that has entered the self-heating unit 11 is again stirred and mixed by the second rotating member 25.

In particular, in this embodiment, the tip end side of the fuel passage cylinder 75 is narrowed, and the fuel gas mixed and stirred by the first rotating member 23 collides violently with each other when passing through the tip of the narrow fuel passage cylinder 75. , Mixing proceeds. Then, the fuel gas is blown into the second rotating member 25 from a narrow portion and is stirred again by the second rotating member 25. In addition, the fuel gas passes through a space 131 formed between the inner surface of the air introduction cylinder 71 and the outer periphery of the induction heat source unit 10 in the self-heating unit 11 and is newly introduced into the self-heating unit 11. Also mixed.
The fuel gas thus generated and further mixed with the primary air flows through a gap 138 formed by the outer wall of the second rotating member 25 and the inner peripheral surface 66 of the self-heating portion 11 as shown by the arrow in FIG. Head downstream. That is, the mixed gas once flows upward along the cylindrical inner peripheral surface 66 of the self-heating portion 11. Here, since the outlet side of the air introduction cylinder 71 is near the opening of the self-heating unit 11, the flow path of the mixed gas is extremely narrow. Therefore, the stirring of the mixed gas further proceeds at the site.

  The air thus supplied from the air introduction cylinder 71 to the inside of the self-heating unit 11 is mixed with the scattered fuel, becomes a high temperature state, and is discharged from the opening 140 at the top of the self-heating unit 11. The mixed gas exiting the self-heating unit 11 flows into the flame hole base 43.

As shown in FIG. 15, the mixed gas (fuel gas) flowing into the flame hole base 43 flows toward the outside through the main flow paths 62 provided radially in the fuel gas flow path 51, and the plate of the flame hole base 43. It flows into the branch flow path (concave groove portion) 54 through a communication portion (opening) 57 provided in the shape portion 56.
Then, the fuel gas flowing through each branch channel 54 flows out from a flame hole (small hole) 61 provided in the flame hole member 45.

In the combustion apparatus 1 of the present embodiment, the liquid fuel is vaporized in the vaporization unit 8 and flows through the flame hole base 43 and is released from the flame hole (small hole) 61. The temperature of the fuel gas when leaving the vaporization unit 8 Therefore, it does not re-liquefy until it reaches the flame hole (small hole) 61.
Further, as described above, the flame hole member 45 has a configuration in which a large number of flame holes (small holes) 61 are provided on a flat plate, and the flame hole member 45 is directly attached to the flame hole base 43. As a result, as will be described later, the recovery rate of the heat of the flame ejected from the flame hole 61 toward the flame hole base 43 increases, and the temperature of the entire flame hole base 43 is raised in a short time even at the beginning of combustion. Can do. Thereby, it becomes possible to prevent re-liquefaction of the fuel gas in the fuel gas channel 51.

On the other hand, the air that has flowed downstream from other parts flows directly into the combustion unit 7 without being mixed with the mixed gas, and contributes to combustion as secondary air. That is, as shown in FIG. 16, the secondary air flows from a large number of openings 47, 48, and 50 provided in the flow dividing member 41 to the long holes 55 of the convex rib portion 53 of the flame hole base 43. It goes directly to the combustion section 7 through the 45 round holes 60 without being mixed with the mixed gas.
When the fuel gas is ignited by an ignition device (not shown), a flame is ejected downward from the flame hole (small hole) 61.

  Here, in the combustion apparatus 1 of the present embodiment, the vaporization unit 8 is directly exposed at the center of the combustion unit 7, and therefore, when combustion is started, the self-heating unit 11 is heated by the flame. Therefore, the temperature in the self-heating part 11 rises and fuel vaporization is further promoted.

  When the combustion is performed for a predetermined time and the temperature of the self-heating unit 11 is sufficiently increased, the energization to the coil wire 91 of the induction heat source unit 10 is stopped and the induction heating is ended. Thereafter, the fuel is vaporized by relying solely on the heat generated by the self-heating portion.

In other words, when the induction heating is stopped, the temperature of the fuel passage cylinder 75 decreases, the vaporization in the induction heat source unit 10 is hardly performed, and the fuel is vaporized only in the self-heating unit 11 substantially.
The liquid fuel that is not vaporized in the induction heat source unit 10 travels along the inner surface of the fuel passage cylinder 75 and reaches downward due to gravity. Here, in the present embodiment, a bowl-shaped groove 87 is formed at the lower end of the fuel passage cylinder 75. Therefore, the fuel that has fallen along the inner surface of the fuel passage cylinder 75 is collected in the lower groove 87. Further, in this embodiment, since the opening 85 on the lower side is inclined, the groove 87 at the end is also inclined, and the collected fuel flows in the groove 87 and collects further downward. In this embodiment, since the opening 88 is provided at the lowermost part of the groove 87, the fuel that has flowed through the groove 87 finally drops from the opening 88 formed at the lowermost part of the groove 87.

  Here, since the opening 88 provided in the fuel passage cylinder 75 is open above the second rotating member 25 and in the vicinity of the center of the second rotating member 25, the fuel dropped from the opening 88 is always constant. It falls to the position and comes into contact with the second rotating member 25. More specifically, all the fuel that has not been vaporized is dripped intensively onto the central portion of the second rotating member 25, and is caught and scattered by the second rotating member 25.

  The scattered fuel collides with the inner wall surface of the self-heating unit 11 and is vaporized by receiving heat from the self-heating unit 11. In addition, it is mixed with the air that flows in and out of the air introduction cylinder 71 and enters the self-heating unit 11. Further, a part of the fuel spills from the second rotating member 25 before being scattered by the centrifugal force, but the fuel that has fallen in this way comes into contact with the bottom 96 of the self-heating unit 11 and is vaporized by receiving heat.

  And the air in the self-heating part 11 is stirred by the blade | wing part provided in the inner surface of the 1st rotation member 23, and mixing with fuel gas and air is accelerated | stimulated. The subsequent flow of the fuel gas is as described above, and is discharged from the opening 140 at the top of the self-heating unit 11 in a high temperature state. The mixed gas that has exited the self-heating portion 11 once flows into the passage on the upper side of the flame hole base 43, is discharged from the flame hole (small hole) 61 through the groove 54 of the flame hole base 43, and burns.

  In the above embodiment, the induction heat source unit 10 is provided in the vaporization unit 8 and the liquid fuel is heated and vaporized by the electromagnetic induction heating method. However, the present invention is not limited to such a configuration. For example, an electric heater may be provided in the vaporizing unit 8 to heat and vaporize the liquid fuel.

It is a perspective view shown in the state where the combustion device of the example of the present invention was turned upside down. It is sectional drawing of the combustion apparatus of the Example of this invention. It is a disassembled perspective view showing the whole component structure of the combustion apparatus of the Example of this invention. It is a front view of the flow dividing member employ | adopted with the combustion apparatus of FIG. It is a front view by the side of the flame hole of the flame hole base employ | adopted with the combustion apparatus of FIG. FIG. 6 is a front view of the flame hole base flow path configuration surface side of FIG. 5. It is a cross-sectional perspective view of the principal part of the flame hole base of FIG. 5, and shows the state seen from the flame hole side upside down. It is a front view of a flame hole member. It is a disassembled perspective view of the flame hole base vicinity. It is a disassembled perspective view of the vaporization part periphery of the combustion apparatus of FIG. It is a perspective view of the fuel passage cylinder which comprises the induction heating part of a vaporization part. (A)-(e) is the front view, top view, left-right side view, and bottom view of a fuel passage cylinder which comprise the induction heating part of a vaporization part. It is a partial cross section perspective view of the induction heating part of a vaporization part. It is the perspective view which looked at the combustion part vicinity of the combustion apparatus of FIG. 2 from the top. It is explanatory drawing which shows the flow of fuel gas. It is explanatory drawing which shows the flow of secondary air. It is a piping system diagram of the hot water supply apparatus which employ | adopted the combustion apparatus of FIG. It is sectional drawing which shows the structural example around the vaporization part employ | adopted with the combustion apparatus of a prior art. It is a perspective view which shows the structural example of the combustion part periphery employ | adopted with the combustion apparatus of a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Combustor 7 Combustion part 8 Vaporization part 10 Induction heat source part 11 Self-heating part 43 Flame hole base 45 Flame hole member 51 Fuel gas flow path 53 Rib (convex rib part)
54 Branch channel (concave groove)
55 Secondary air flow path (long hole)
57 Communication part (opening)
61 Flame hole (small hole)
62 Basic channel (groove)

Claims (8)

  In a combustion apparatus having a vaporization unit that vaporizes liquid fuel to generate a fuel gas, and sends the generated fuel gas or a mixed gas of fuel gas and air to the combustion unit for combustion, at least a part of the vaporization unit Is exposed to the combustion section, and the combustion section includes a flame hole base having a fuel gas flow path communicating with the vaporization section, and a fuel that is attached to the flame hole base and flows through the fuel gas flow path. It is composed of a flame hole member having a plurality of flame holes for ejecting gas or mixed gas, and the flame hole base and flame hole member of the combustion part have a substantially regular polygonal shape of a hexagon or more centered on the vaporization part. Combustion device formed. In a combustion apparatus having a vaporization unit that vaporizes liquid fuel to generate a fuel gas, and sends the generated fuel gas or a mixed gas of fuel gas and air to the combustion unit for combustion, at least a part of the vaporization unit Is exposed to the combustion section, and the combustion section includes a flame hole base having a fuel gas flow path communicating with the vaporization section, and a fuel that is attached to the flame hole base and flows through the fuel gas flow path. It is composed of a flame hole member having a plurality of flame holes for ejecting gas or mixed gas,
The fuel gas flow path includes a plurality of basic flow paths that extend radially from the vaporization section side, and a branch flow path that extends from the basic flow path toward the adjacent main flow path side, and the branch flow path includes the vaporization section. A combustion apparatus, wherein a plurality of fuel gases arranged in a direction away from the fuel flow and flowing through the branch flow path are ejected from the flame holes.   The vaporization part is located at a substantially central part of the combustion part, and the flame-hole-based fuel gas flow path connects the central part of the vaporization part and each vertex of a substantially regular polygon centered on the central part. A plurality of basic flow paths extending radially from the vaporization portion side in the direction, and a plurality of branch flow paths arranged parallel to each side of the substantially regular polygon and communicating between adjacent basic flow paths The combustion apparatus according to claim 2, wherein a plurality of the branch flow paths are arranged in a direction away from the vaporizing section.   The combustion apparatus according to claim 3, wherein the regular polygon that serves as a reference when the fuel gas flow path is arranged is a substantially regular polygon that is a hexagon or more.   The flame-hole-based fuel gas flow path is mounted on the main flow path formed radially with respect to the vaporizing portion on the surface opposite to the surface on which the flame hole member is mounted, and the flame hole member is mounted. The branch channel formed between the ribs projecting substantially in parallel so as to bridge between the main channels adjacent to the surface to be formed, and the basic channel and the branch channel The combustion apparatus according to claim 3 or 4, wherein the combustion chambers communicate with each other through a communication portion provided in the flame hole base.   The flame hole member is formed by providing an opening to be a flame hole in a flat plate material, and a plurality of the flame holes are arranged at portions along the branch flow path when the flame hole member is mounted on the flame hole base. The combustion apparatus according to any one of claims 2 to 5, wherein:   The secondary air flow path which penetrates a flame hole base and a flame hole member was provided between the branch flow paths which the said flame hole base adjoins, The any one of Claim 2 thru | or 6 characterized by the above-mentioned. Combustion equipment.   The vaporization section includes an auxiliary heat generation section that has an independent heat source and mainly receives heat from the heat source and raises the temperature, and a self-heating section that mainly raises the temperature by receiving heat from the combustion section. The combustion apparatus according to any one of 1 to 7.

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