JPH08583Y2 - Combustor - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a combustor applicable to a heating device, a drying device, a boiler, a water heater, a greenhouse, and the like.

[Conventional technology]

Conventionally, as a structure of a combustor, for example, JP-A-62-69009
There are combustors such as those disclosed in the publication. JP-A-62-6
The combustor disclosed in Japanese Patent No. 9009 will be outlined with reference to FIG. The combustor 50 shown in FIG.
Baffle plate 52 having a plurality of cutout passages 53 in the periphery of the inside of the
The vaporization chamber 54 and the combustion chamber 56 having the air introduction hole 55 in the peripheral wall.
Disclosed is a combustor 50 having a fuel vaporizer 60 having a nozzle 57 for ejecting vaporized fuel, which is divided into two parts, and which opens to the vaporization chamber 54, and has fins 58 on the outer peripheral surface. In the figure, 59 indicates a cover plate.

Further, there is a combustor disclosed in Japanese Patent Laid-Open No. 1-179810. The combustor divides a combustion cylinder having an air introduction hole into a combustion chamber and a vaporization chamber by a partition plate having an air flow opening, and a vaporization chamber forming cylinder is provided between the combustion cylinder and the combustion cylinder. Arranged to form an air-conducting gap, further, a large number of micro air introduction holes are formed in the vaporization chamber forming cylinder to introduce air along the inner wall surface of the vaporization chamber through the micro air introduction holes, A cooling air introduction hole is formed at an end of the combustion cylinder so that cooling air is introduced into the air communication gap.

[Problems to be solved by the device]

However, regarding the above-mentioned combustor 50 disclosed in the above-mentioned JP-A-62-69009, it cannot be said that the introduction of the combustion air into the combustion cylinder 51 is sufficient with respect to the introduction of the combustion air. , Mist carbon may be generated in the flow of the vaporized fuel ejected into the vaporization chamber 54, and the vaporized fuel is liquefied and adheres to the inside of the combustion cylinder 51 or is blown up in the combustion cylinder 51 to generate carbon. However, it is not sufficient to generate a preferable air-fuel mixture or prevent carbon from being generated in the mixed state of the combustion air and the vaporized fuel after the introduction.

Further, the combustor disclosed in the above-mentioned JP-A-1-179810 is a solution to the above problems, but combustion in the combustion cylinder of the combustor becomes a high temperature region near the heat receiving portion of the fuel vaporizer, In some cases, it does not have the technical idea of displacing the high temperature region of combustion due to changes in the combustion state. If the combustion state in the combustor does not reach the high temperature region near the heat receiving part, the radiant heat in the combustion chamber can be sufficiently given to the fuel vaporizer when the fire is displaced to the downstream side in the combustion cylinder during the active combustion state. In some cases, the liquid fuel cannot be vaporized sufficiently.

An object of the present invention is to solve the above-mentioned problems, and in a combustor in which fuel is vaporized at a high speed and the vaporized fuel is mixed with combustion air for combustion, a combustion cylinder is used as a primary combustion chamber and a secondary combustion chamber. A guide fin is provided in the communication hole formed in the plate divided into the chamber and the jet direction of the air-fuel mixture jetted from the primary combustion chamber to the secondary combustion chamber to the heat receiving part of the fuel vaporizer arranged in the secondary combustion chamber. Directing and promoting the vaporization of liquid fuel in the fuel vaporizer, and in some cases, the guide fins are made of shape memory alloy, and in response to the operating condition of the combustor, that is, the combustion state, the jetting of the mixture gas of the guide fins The direction is automatically changed and adjusted, the combustion region where the heat receiving part of the fuel vaporizer is located is always maintained at a high temperature, the radiant heat of the fuel vaporizer is sufficiently received, and the liquid fuel inside the fuel vaporizer is Promotes vaporization and fuel vaporization equipment It suppresses the accumulation of carbon on the wall surface of the combustion cylinder and the wall surface of the primary combustion chamber that closes the ends of the combustion cylinder, by introducing the primary air into the primary combustion chamber and igniting the fuel ejected from It is an object of the present invention to provide a combustor that ideally mixes vaporized fuel and combustion air in a secondary combustion chamber to vigorously combust and completely combust.

[Means for solving the problem]

The present invention is configured as follows in order to achieve the above object. That is, the present invention is directed to a combustion cylinder having a large number of air introduction holes divided into a primary combustion chamber and a secondary combustion chamber by a plate, a fuel vaporizer having a heat receiving portion arranged in the secondary combustion chamber, and the primary combustion chamber. The present invention relates to a combustor including a communication port formed in the plate that communicates with the secondary combustion chamber, and a guide fin that directs the direction of the air-fuel mixture jet from the communication port toward the heat receiving portion.

Alternatively, in this combustor, the guide fins are made of a shape memory alloy, and the jet direction of the air-fuel mixture in the communication holes is changed and adjusted in response to the combustion state.

Alternatively, in this combustor, a large number of air introduction holes formed in the primary combustion chamber are opened in the direction along the inner peripheral wall surface of the primary combustion chamber and in the direction along the end inner wall surface.

[Action]

The combustor according to the present invention is configured as described above and operates as follows. In this combustor, a combustion cylinder is divided into a primary combustion chamber and a secondary combustion chamber by a plate, the primary combustion chamber and the secondary combustion chamber are communicated with each other through a communication port formed in the plate, and the combustion chamber is provided at the communication port. Since the direction of jetting the air-fuel mixture from the communication port is directed to the heat receiving portion of the fuel vaporizer by the guide fin, the air-fuel mixture from the primary combustion chamber to the secondary combustion chamber is guided by the guide fin and the fuel vaporizer. Toward the heat receiving part, the combustion point in the secondary combustion chamber is maintained at the heat receiving part, and combustion is performed there to bring the vicinity of the heat receiving part into a high temperature region. Therefore, the vaporization of the liquid fuel in the fuel vaporizer is promoted, good vaporized fuel is generated, and it can be ejected to the primary combustion chamber. Therefore,
It is possible to prevent carbon from being deposited in the fuel vaporizer, the wall surface of the combustion cylinder, the wall surface of the primary combustion chamber forming body, etc. due to insufficient vaporization in the fuel vaporizer.

Alternatively, since the guide fin is made of a shape memory alloy, the inflow direction of the air-fuel mixture from the primary combustion chamber to the secondary combustion chamber can be changed by the guide fin according to the operating state of the combustor, and the air-fuel mixture is constantly mixed. The optimum flow direction can be secured, the combustion point in the secondary combustion chamber can be maintained in the heat receiving part of the fuel vaporizer, and vaporization of the liquid fuel in the fuel vaporizer can be promoted. . That is, when the combustor is in a high operation, the jet direction of the air-fuel mixture can be changed by the guide fins toward the central portion of the combustion tube, the displacement of the combustion region to the downstream side of the combustion tube is suppressed, and the high temperature of combustion is constantly maintained. The region can be maintained in the heat receiving portion of the fuel vaporization device, and vaporization of the liquid fuel in the fuel vaporization device can be always maintained well.

Alternatively, since a large number of air introduction holes formed in the primary combustion chamber are opened in a direction along the inner peripheral wall surface and the end inner wall surface of the primary combustion chamber, the primary combustion chamber is cooled by the supplied primary air, and The primary combustion chamber can be maintained at a low temperature without being heated to a high temperature, and moreover, by causing the air flow along all the wall surfaces to flow into the primary combustion chamber, the fuel does not adhere to the wall surfaces and the fuel is not carbonized, The air-fuel mixture can be satisfactorily generated, and the fuel is not carbonized in the primary combustion chamber to generate carbon.

〔Example〕

An embodiment of a combustor according to the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view showing an embodiment of a combustor according to the present invention. This combustor can be applied to, for example, a heating device, a drying device, a boiler, a water heater, a greenhouse, etc., and the combustion gas generated in the combustor is sent to a heat exchanger or the like installed downstream. It is what is done. As shown in FIG. 1, the combustor according to the present invention is mainly composed of a ceramic combustion cylinder 1 and a combustion cylinder 1 which are divided into a primary combustion chamber 7 and a secondary combustion chamber 6 by a plate 22 having a communication port 15. The outer cylinder 14 disposed on the outer periphery of the outer cylinder 14 to form the annular air introduction passage 20, the primary combustion chamber forming body 5 attached to one end of the combustion cylinder 1, and the heat receiving portion of the secondary combustion chamber 6 of the combustion cylinder 1 as the heat receiving portion. fin
The fuel vaporizer 2 in which 12 is arranged, the combustion cylinder 1 and the primary combustion chamber forming body 5, and the air introduction passage 20 outside the combustion cylinder 1 communicates with the primary combustion chamber 7 and the secondary combustion chamber 6, respectively. Of the fuel vaporization device 2 along the air introduction holes 11, 13, 27, and the communication port 15 formed in the plate 22 in communication with the primary combustion chamber 7 and the secondary combustion chamber 6 and in response to the combustion state. The guide fins 8 are oriented to the heat receiving fins 12 of FIG. The interior of the combustion cylinder 1 is divided into a primary combustion chamber 7 and a secondary combustion chamber 6 by a plate 22 having a plurality of openings 15 in the peripheral portion and a communication port 15 such as a cutout passage. The tubular body 9 connected to the other end of the combustion tube 1 communicates with the secondary combustion chamber 6 through the outlet 18 formed in the combustion tube 1. An outer cylinder 14 is attached to the outer peripheral side of the combustion cylinder 1 so as to form an annular air introduction passage 20. A current plate 25 is arranged in the middle of the air introduction path 20, and a large number of communication holes 31 are formed in the current plate 25.
An air intake 4 is formed in the outer cylinder 14, and the air intake 4 communicates with an outlet of a scroll of a blower such as a turbo fan. Thereby, the combustion air sent from a blower such as a turbo fan is introduced into the air introduction passage 20 through the air intake 4, and a good swirl is formed in the air introduction passage 20.

A large number of air introduction holes 11 are formed in the peripheral wall of the combustion cylinder 1 forming the secondary combustion chamber 6, and the secondary air is supplied from the air introduction passage 20 to the secondary combustion chamber 6 through the air introduction holes 11. It
In addition, a large number of air introduction holes 13 and 27 are formed in the primary combustion chamber forming body 5 that closes the end of the primary combustion chamber 7, and the air introduction passages 20 to the primary combustion chamber 7 are formed through the air introduction holes 13 and 27. Primary air is supplied.

Further, the air introduction hole 11 formed in the combustion cylinder 1 for introducing air from the air introduction passage 20 into the secondary combustion chamber 6 has a circumferential direction so as to promote the flow of the swirling flow formed in the combustion cylinder 1. It can also be formed with an inclination. Further, the air introduction hole formed in the combustion cylinder 1 which is introduced into the primary combustion chamber 7 from the air introduction passage 20 has an inner peripheral wall surface 28 of the primary combustion chamber forming body 5 in the combustion cylinder 1.
A plurality of air introduction holes 13 formed in the outer peripheral portion of the primary combustion chamber forming body 5 so as to open in the direction along the line, and the combustion cylinder 1 so as to open in a direction along the end inner wall surface 29 of the primary combustion chamber forming body 5. And a large number of air introduction holes 27 formed in the peripheral wall of the end portion of. By introducing the primary air introduced from the air introduction holes 13 and 27 into the primary combustion chamber 7 in the intersecting direction, the temperature inside the primary combustion chamber 7 is maintained at the most suitable temperature for the vaporized fuel, and the fuel is introduced into the air. By mixing with the primary air introduced from the holes 13 and 27, an ideal air-fuel mixture can be created, carbon does not easily reach a high temperature, and the carbon does not become an inner wall surface of the primary combustion chamber 7, that is, the primary air. It is prevented from adhering to the inner peripheral wall surface 28 and the end inner wall surface 29 of the combustion chamber forming body 5,
Moreover, the primary air introduced into the primary combustion chamber 7 has a function of vaporizing the liquid fuel and a function of forming an ideal air-fuel mixture. Furthermore, the air introduction hole 13 also has a function of moving and burning carbon that may be generated in the primary combustion chamber forming body 5.

The fuel vaporizer 2 penetrating the side wall of the combustion cylinder 1 is installed obliquely through the secondary combustion chamber 6 toward the communication hole 19 formed in the central portion of the plate 22. The fuel injection port 23 is opened to the primary combustion chamber 7. Further, in the primary combustion chamber 7, an ignition glow plug 3 which is a heating plug is installed. Regarding the fuel vaporizer 2,
Although not shown, a vaporization glow plug is built in a metal vaporization pipe 26. At one end of the vaporization pipe 26, a terminal 17 for supplying a current to a resistance wire made of tungsten or the like embedded in a silicon nitride member of a vaporization glow plug which is a heating plug is located. At the other end of the vaporizing pipe 26, a jetting pipe 21 having a diameter smaller than that of the vaporizing pipe 26 is attached, and a fuel jetting port 23 is formed at the tip of the jetting pipe 21. Further, the vaporization pipe 26 is provided with a fuel supply pipe 16. Furthermore, the vaporizing pipe 26
Heat receiving fins 12 are formed on a portion of the outer peripheral surface located in the secondary combustion chamber 6. A jet pipe 21 extends from the tip of the vaporization pipe 26, and the jet pipe 21 is a plate.
The fuel injection port 23 formed at the tip of the injection pipe 21 is located near the ignition glow plug 3 installed in the primary combustion chamber 7 It is open.

In the combustor according to the present invention, in the above-mentioned configuration, in particular, the heat receiving fins 12 which are the heat receiving portions of the fuel vaporizer 2 are arranged in the secondary combustion chamber 6 so that the primary combustion chamber 7 and the secondary combustion chamber 6 communicate with each other. It is characterized in that a guide fin 8 is provided which directs the direction of the air-fuel mixture ejection from the communication port 15 formed in the plate 22 to the heat receiving fin 12. With this configuration, this combustor guides the ejection direction of the air-fuel mixture ejected from the primary combustion chamber 7 to the secondary combustion chamber 6 by the guide fins 8 provided in the communication holes 15 of the plate 22 and is indicated by the arrow A. Fuel vaporizer 2
Of the heat-receiving fins 12, the combustion in the heat-receiving part becomes active, and the heat-receiving part becomes a high temperature region, whereby
The radiant heat of the secondary combustion chamber 6 can be sufficiently received by the heat receiving fin 12 which is the heat receiving portion of the fuel vaporizer 2.

Next, the operation of the combustor according to the present invention will be described. In order to operate this combustor, first, the resistance wire of the vaporization glow plug arranged so as to form the fuel passage in the vaporization pipe 26 of the liquid fuel vaporization device 2 is energized to heat the vaporization glow plug. At the same time, the fuel supply pump is operated to supply the liquid fuel from the fuel supply pipe 16. The liquid fuel is vaporized by the vaporization glow plug in the liquid fuel vaporization device 2, and the vaporized fuel is vaporized from the fuel injection port 23 of the ejection pipe 21 through the space between the vaporization pipe 26 and the vaporization glow plug, that is, the fuel passage. Fuel is ejected into the primary combustion chamber 7. On the other hand, due to the operation of the blower, the combustion air is blown into the air introduction path 20 between the outer cylinder 14 and the combustion cylinder 1 through the air intake 4, and the large amount of the air blown into the air introduction path 20. The portion swirls in the secondary combustion chamber 6 from the air introduction hole 11 of the combustion cylinder 1 to the entire inside of the secondary combustion chamber 6 in an extremely ideal state while swirling in the air introduction passage 20 through the communication hole 31 of the straightening plate 25. Is ideally mixed with the vaporized fuel ejected from the primary combustion chamber 7 in the secondary combustion chamber 6 to generate an air-fuel mixture, but part of the air blown into the secondary combustion chamber 6 is a plate. It is blown into the primary combustion chamber 7 from the communication port 15 of 22 and becomes primary air. Further, a part of the air blown into the air introduction passage 20 is swirled in the air introduction passage 20 and blown into the primary combustion chamber 7 through the air introduction holes 13 and 27 formed in the primary combustion chamber forming body 5 as primary air. Be done.

Therefore, the vaporized fuel ejected from the fuel ejection port 23 into the primary combustion chamber 7 is discharged from the communication port 15 of the plate 22 into the primary combustion chamber 7.
The primary air blown into the interior and the primary air blown from the air introduction holes 13 and 27 formed in the primary combustion chamber forming body 5 are mixed to generate a good air-fuel mixture, and the fuel injection port 23 is slightly generated.
The ignition glow plug 3 ignites and burns due to the presence of oil droplets blown out from. Then, the air-fuel mixture in the primary combustion chamber 7 is guided by the guide fins 8 arranged in the communication port 15 formed in the plate 22 and is guided into the secondary combustion chamber 6 by the arrow A.
In the secondary combustion chamber 6, the air introduction hole 11
The secondary air introduced from the above is mixed with a more homogeneous air-fuel mixture, and the high temperature region of combustion is maintained by the heat receiving fins 12 of the fuel vaporization device 2 so that the combustion is more complete and vigorous. The vaporized fuel is combusted to form combustion gas, which is sent out from the combustion gas outlet 18 formed at the downstream end of the combustion cylinder 1 to the cylinder 9.

Next, when the combustion state in the secondary combustion chamber 6 becomes active,
Radiant heat is received via the vaporization pipe 26 of the fuel vaporization device 2 and the heat receiving fins 12 provided on the vaporization pipe 26. In this state, the power supply to the vaporization glow plug of the fuel vaporization device 2 is stopped. After that, the liquid fuel in the fuel vaporizer 2 receives radiant heat from the secondary combustion chamber 6, in other words, is vaporized by receiving vaporization heat, becomes vaporized fuel, is blown out to the primary combustion chamber 7, and is mixed well with the combustion air. Generates Qi and continues burning. This air-fuel mixture is guided from the primary combustion chamber 7 to the guide fins 8 and is constantly ejected to the secondary combustion chamber 6 in the direction of arrow A,
Combustion in the area of the heat receiving fins 12 of the fuel vaporizer 2 is actively performed to raise the temperature of the area. Therefore, the fuel vaporizer 2 can sufficiently receive the radiant heat in the secondary combustion chamber 6 through the heat receiving fins 12 to further promote the vaporization of the liquid fuel in the fuel vaporizer 2.

In this combustion action, the liquid fuel is heated and vaporized by the vaporizing glow plug, and the vaporized fuel is ejected from the fuel ejection port 23. At this time, the vaporization of the liquid fuel is incomplete or vaporized from the fuel ejection port 23. Oil drops are mixed in the fuel,
When carbon mist is ejected, carbon may be generated and accumulated on the inner wall surface of the lower part of the combustion cylinder 1. In this combustor, the primary combustion chamber forming body 5 forming the primary combustion chamber 7 is formed. Since the air introduction holes 13 and 27 are formed in the primary combustion chamber 7, the temperature inside the primary combustion chamber 7 is less likely to generate carbon, that is, the temperature is lower than the temperature at which the fuel is carbonized, and the fuel is kept inside the primary combustion chamber 7. Therefore, carbonization does not occur and carbon does not become carbon. Therefore, carbon does not adhere to or accumulate on the wall surfaces in the primary combustion chamber 7 and the secondary combustion chamber 6.

Next, another embodiment of the combustor according to the present invention will be described with reference to FIG. FIG. 2 is an enlarged explanatory view showing another embodiment of this combustor taken along the line II in FIG. The guide fin 8 in this embodiment is made of a shape memory alloy and deforms in response to the combustion temperature. That is, since the guide fins 8 provided on the plate 22 that divides the inside of the combustion cylinder 1 into the primary combustion chamber 7 and the secondary combustion chamber 6 are made of a shape memory alloy, the combustor is started or supplied. As shown by the solid line in FIG. 2, during low operation by adjusting the fuel and the combustion air fed in,
It has been transformed into a standing state. That is, at the start of operation of the combustor or at the time of low operation, the heating plug in the fuel vaporization device 2 is turned on and vaporization of the liquid fuel is constituted by the heating plug, or the flame is on the downstream side in the combustion tube 1. In this state, the combustion temperature in the combustion cylinder 1 is low. Therefore, from the primary combustion chamber 7 to the secondary combustion chamber 6
Since the jet direction of the air-fuel mixture ejected to the direction is as shown by the arrow C, the combustion is stabilized, and the radiant heat of the secondary combustion chamber 6 is sufficiently received by the heat receiving fins 12 which are the heat receiving portion of the fuel vaporization device 2. Can be made. On the other hand, during high operation of the combustor, the guide fin 8 is at a high temperature and
As shown by the dotted line in the figure, it deforms to a state of inclining toward the center side. That is, during high operation of the combustor, the combustion temperature in the combustion tube 1 becomes high, and unless the guide fin 8 changes the jet direction of the air-fuel mixture to the center side, the flame extends to the downstream side of the combustion tube 1. The high temperature region is the heat receiving fin of the fuel vaporizer 2.
It will come off to the downstream side of 12. Therefore, by changing the guide fins 8 in response to the temperature, the ejection direction of the air-fuel mixture ejected from the primary combustion chamber 7 to the secondary combustion chamber 6 is changed so as to face the heat receiving fins 12 as shown by an arrow B. The high temperature region of the flame can be maintained at the installation position of the heat receiving fins 12 of the fuel vaporizer 2. Therefore, combustion is the heat receiving fin
It becomes active in the vicinity of 12, and the radiant heat of the secondary combustion chamber 6 can be sufficiently received by the heat receiving fins 12 which are the heat receiving portion of the fuel vaporization device 2, and the vaporization of the liquid fuel in the fuel vaporization device 2 is promoted. As a result, vaporized fuel can be satisfactorily generated and injected into the primary combustion chamber 7.

Further, another embodiment of the combustor according to the present invention will be described with reference to FIG. The combustor of this embodiment has a first
Compared with the combustor of the embodiment shown in the drawings, the components are substantially the same except that the configurations of the plates and the guide fins that partition the primary combustion chamber 7 and the secondary combustion chamber 6 are different. Are denoted by the same reference numerals and redundant description will be omitted.
In FIG. 3, a guide fin 30 for changing and adjusting the jet direction of the air-fuel mixture is integrally formed on the plate 24 that divides the combustion cylinder 1 of the combustor into the primary combustion chamber 7 and the secondary combustion chamber 6. ing. The guide fin 30 is composed of a portion protruding toward the primary combustion chamber 7 side and a portion protruding toward the secondary combustion chamber 6 side. Further, the entire plate 24 may be formed of a shape memory alloy, or only the guide fins 30 may be manufactured of a shape memory alloy and integrally fixed to the plate 24. The function of the guide fins 30 is to guide the flow of fluid when air is introduced from the secondary combustion chamber 6 to the primary combustion chamber 7 and when the air-fuel mixture is ejected from the primary combustion chamber 7 to the secondary combustion chamber 6. The function of performing smoothly is achieved, and the function similar to that of the guide fin 8 in the combustor of the above-described embodiment is achieved.

[Effect of device]

The combustor according to the present invention is configured as described above and has the following effects. That is, the combustor includes a combustion cylinder having a large number of air introduction holes divided into a primary combustion chamber and a secondary combustion chamber by a plate, a fuel vaporizer having a heat receiving portion arranged in the secondary combustion chamber, and the primary combustion chamber. And a communication port formed in the plate that communicates with the secondary combustion chamber, and a guide fin that directs the air-fuel mixture jetting direction of the communication port to the heat receiving portion, so that the primary combustion chamber is communicated through the communication port. The air-fuel mixture ejected into the secondary combustion chamber is guided by the guide fins toward the heat receiving portion of the fuel vaporizer and maintains a combustion point in the secondary combustion chamber at the heat receiving portion, Combustion becomes vigorous, and the vicinity of the heat receiving part becomes a high temperature region. Therefore, the vaporization of the liquid fuel in the fuel vaporizer is promoted, vaporized fuel is satisfactorily generated, and jetted into the primary combustion chamber. Therefore, vaporization in the fuel vaporizer becomes insufficient, and carbon is prevented from being deposited in the fuel vaporizer, the wall surface of the combustion cylinder, the wall surface of the primary combustion chamber, and the like.

Alternatively, in this combustor, the guide fins are made of a shape memory alloy, and the guide fins are responsive to the combustion temperature because the guide fins are configured to be changed and adjusted in response to the combustion state. As a result, the desired direction of the air-fuel mixture can be immediately changed and adjusted, and the structure is simple and the temperature can be easily adjusted.
That is, the flow direction of the air-fuel mixture from the primary combustion chamber to the secondary combustion chamber can be changed by the guide fins according to the operating state of the combustor, and the optimum flow direction of the air-fuel mixture can be always secured, The combustion point in the combustion chamber can be maintained in the heat receiving portion of the fuel vaporizer, and vaporization of the liquid fuel in the fuel vaporizer can be promoted. That is, when the combustor is in a high operation, the jet direction of the air-fuel mixture can be changed by the guide fins toward the central portion of the combustion tube, the displacement of the combustion region to the downstream side of the combustion tube is suppressed, and the high temperature of combustion is constantly maintained. The region can be maintained in the heat receiving portion of the fuel vaporization device, and vaporization of the liquid fuel in the fuel vaporization device can be always maintained well.

Alternatively, in this combustor, since a large number of air introduction holes formed in the primary combustion chamber are opened in the direction along the inner peripheral wall surface of the primary combustion chamber and the direction along the end inner wall surface, the primary combustion chamber is Is maintained at a temperature below the temperature at which the fuel is carbonized, and the fuel is not carbonized to generate carbon in the primary combustion chamber. Moreover, by introducing the air flow along each of the inner wall surfaces, the fuel does not adhere to the wall surfaces of the primary combustion chamber to carbonize the fuel, and the air-fuel mixture is satisfactorily generated. There is no possibility of carbonization of fuel and generation of carbon.

Therefore, the liquid fuel is immediately and rapidly vaporized by the fuel vaporizer to be vaporized fuel and is jetted to the primary combustion chamber, and combustion air is introduced from the air introduction passage around the combustion cylinder. It is easy to enter the combustion cylinder smoothly and in a low resistance state through the holes, and further, the vaporized fuel and the combustion air are mixed well in the secondary combustion chamber to generate an ideal air-fuel mixture. A part of the combustion air can be introduced into the combustion chamber to ignite the vaporized fuel very well and reliably, and the combustion can be vigorously activated. Moreover, even if the combustion state changes, the vaporization always occurs in the fuel vaporizer. Can be satisfactorily achieved, and combustion gas can be vigorously ejected from the secondary combustion chamber to the downstream, and then sent to a predetermined place, for example, a heat exchanger or the like.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the combustor according to the present invention, FIG. 2 is an enlarged explanatory view showing another embodiment of the combustor taken along line II in FIG. 1, and FIG. 3 is according to the present invention. Sectional drawing which shows another Example of a combustor, and FIG. 4 are sectional drawings which show an example of the conventional combustor. 1 ... Combustion cylinder, 2 ... Fuel vaporizer, 4 ... Air inlet, 5 ... Primary combustion chamber forming body, 6 ... Secondary combustion chamber, 7 ...
… Primary combustion chamber, 8,30 …… Guide fins, 11,13,27 …… Air inlet hole, 14 …… Outer cylinder, 15 …… Communication port, 20 …… Air inlet passage, 22,24 …… Plate, 28,29 …… Wall.

Claims (3)

[Scope of utility model registration request] 1. A combustion cylinder having a large number of air introduction holes divided into a primary combustion chamber and a secondary combustion chamber by a plate, a fuel vaporizer having a heat receiving portion arranged in the secondary combustion chamber, the primary combustion chamber and the A combustor comprising: a communication port formed in the plate that communicates with a secondary combustion chamber; and a guide fin that directs the direction of the air-fuel mixture jet from the communication port toward the heat receiving portion. 2. The combustor according to claim 1, wherein the guide fin is made of a shape memory alloy, and the direction in which the air-fuel mixture is ejected from the communication port is changed and adjusted in response to a combustion state. 3. The combustor according to claim 1, wherein a large number of air introduction holes formed in the primary combustion chamber are opened in a direction along the inner peripheral wall surface of the primary combustion chamber and in a direction along the end inner wall surface.