JPH074617A - Evaporation type burner - Google Patents

Abstract

PURPOSE:To improve combustion efficiencies by preventing a deposit of combustion residuals on a combustion absorbing body to extend the durability thereof and by uniformly mixing vaporized fuel with air. CONSTITUTION:An evaporation chamber 38 is formed between a holding case 32 having storage chambers 34 each provided with fuel absorbing bodies 40, 42, 44, 46 and a wall board 18. The storage chambers 34 storing therein the bodies 40, 42, 44, 46 are interconnected only by an equalizing chamber 36, and the chamber 36 is connected with the chamber 38. A combustion chamber 60 is formed in a body 28 and the chamber 60 communicates with the chamber 38 through a connection passage 62 and also the evaporation chamber 38 is made free from flames of the combustion chamber 60. A mixing pipe 64 wherein combustion air from an air swirling chamber 14 and vaporized fuel from the chamber 38 are mixed together to form a mixture is projected into the chamber 60. A large number of ejection holes 66 are formed on the mixing pipe 64. The mixture is ejected into the chamber 60 from the holes 66.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an evaporative burner used for a heating device such as a vehicle heater, a ship heater, a general-purpose portable heater and the like.

[0002]

2. Description of the Related Art Generally, for example, Japanese Unexamined Patent Application Publication No. Sho 5-
Evaporative burners for heating vehicles and ships, such as that shown in No. 9-60109, are provided. In this evaporative burner, a combustion chamber is formed inside a tubular body, and a fuel absorber is arranged directly in the combustion chamber, or a fuel absorber is provided facing the combustion chamber, and the heat inside the combustion chamber is reduced. To vaporize the fuel from the fuel absorber to produce vaporized fuel. On the other hand, an inflow hole for combustion air is formed on the wall surface of the body, the combustion air from the inflow hole and the vaporized fuel generated from the fuel absorber are mixed in the fuel chamber, and the vaporized fuel and the combustion air are mixed. Ignite the mixture with a spark plug.

[0003]

The conventional evaporative burner has a structure in which vaporized fuel and combustion air flow into the combustion chamber from different positions. For this reason, it is difficult to completely mix the vaporized fuel and the combustion air, and it is also difficult to set the inflow hole for the combustion air. Further, since the fuel absorber is arranged in the combustion chamber, over time, products of combustion are deposited on the fuel absorber, evaporation from the fuel absorber is impaired, and combustion failure occurs. It was easy to occur.
In particular, when the fuel used is heavy oil such as light oil or heavy oil, if the fuel is exposed to high heat as a liquid from the fuel absorber, the fuel partially decomposes and a carbide residue easily occurs. . On the other hand, when the fuel used is a fuel that is easily volatilized, such as gasoline, it is exposed to high heat and vaporizes immediately, so that the vaporized fuel is mixed in the region with a bias in the vaporized fuel in the region, and the air-fuel mixture becomes There is a risk of burning unevenly. Furthermore, when a volatile fuel such as gasoline is used, the fuel introduced into the fuel absorber becomes intermittent, and as a result, vaporization from the fuel absorber also becomes intermittent, resulting in burner flame There was a risk of causing fouling and pulsation of flames.

The present invention has been made in view of the above-mentioned circumstances. Regardless of what kind of fuel is used, the fuel is continuously vaporized and a uniform air-fuel mixture is produced to improve combustion efficiency. Moreover, it is an object of the present invention to provide an evaporative burner capable of preventing the accumulation of carbide residue on the fuel absorber and prolonging its life.

[0005]

In order to achieve the above object, the present invention introduces fuel into a fuel absorber through a fuel supply pipe, vaporizes the fuel contained in the fuel absorber, and In an evaporative burner in which combustion air is mixed with vaporized fuel to form an air-fuel mixture, and the air-fuel mixture is ignited by a heat generating means in a combustion chamber provided inside a tubular body, the fuel absorber is directly connected to the combustion chamber. A storage case having a storage chamber for storing the storage chamber in an unexposed state, a holding case facing the combustion chamber, and a storage case provided adjacent to the holding case and communicating with the combustion chamber and generated in the combustion chamber. A vaporization chamber adapted to introduce a part of the combustion gas in a flameless state, a pressure equalizing chamber communicating one with the storage chamber and the other with the vaporization chamber, and means for giving a swirling force to the combustion air. Equipped with an air swirl chamber, A mixing pipe having one end protruding into the combustion chamber and an opening at the other end communicating with the air swirl chamber and the vaporization chamber, and into the combustion chamber for connecting the inside of the mixing pipe and the combustion chamber. Having a plurality of injection holes formed in the mixing pipe at a protruding portion, the heat is introduced into the fuel absorber by the heat of the combustion gas generated in the combustion chamber and the heat of a part of the combustion gas passing through the vaporization chamber. The vaporized fuel is vaporized, and the vaporized fuel is made uniform in the pressure equalizing chamber and jetted to the vaporization chamber, and the vaporized fuel jetted to the vaporization chamber is generated by the combustion air given the swirling force in the air swirling chamber. The mixture is introduced into the mixing pipe, the vaporized fuel and the combustion air are mixed in the mixing pipe, and the mixture is injected into the combustion chamber through the injection holes provided in the mixing pipe.

[0006]

[Function] A vaporization chamber that communicates with the combustion chamber through a communication passage is provided, and a portion of the combustion gas in the combustion chamber is introduced into the vaporization chamber in the absence of flame, and the fuel absorber is partially absorbed by the combustion gas. It is heated to promote vaporization of the fuel from the fuel absorber.
The vaporized fuel vaporized from the fuel absorber is introduced into the pressure equalizing chamber, the vaporized fuel is kept at a uniform pressure in the pressure equalizing chamber, and the vaporized fuel at the uniform pressure is evenly distributed in the air chamber around the opening of the mixing pipe. Gush out at. As a result, the vaporized fuel is uniformly mixed with the combustion air in the mixing pipe, and a uniform air-fuel mixture can be created. Further, since the fuel absorber is exposed only to the pressure equalizing chamber, the fuel absorber does not directly face the combustion chamber or the high temperature vaporization chamber, and the accumulation of carbide residue on the fuel absorber is suppressed.

[0007]

First Embodiment Next, the present invention will be described with reference to the drawings. 1 is a sectional view showing an embodiment of an evaporative burner according to the present invention, and FIG. 2 is a sectional view taken along the line AA of FIG. This example relates to the case of using heavy oil such as light oil or heavy oil. The vertical direction of FIGS. 1 and 2 is the vertical direction when the evaporative burner is actually installed. An air swirl chamber 14 is formed inside the casing 10 by the casing 10 and the cover 12, and the air swirl chamber 1 is formed.
An air inlet 16 for introducing air to the 4 is also formed. The wall plate 18 constituting the casing 10 is provided with a plurality of spiral guide plates 20 on the air swirl chamber 14 side, and the plurality of spiral guide plates 20 are, as shown in FIG. The air swirl chamber 14 is set to have a shape such that air is directed to the center thereof. A tubular portion 22 projecting to the opposite side of the guide plate 20 is integrally formed in the center of the wall plate 18, and combustion is swirled in the air swirl chamber 14 in an air passage 24 which is an internal space of the tubular portion 22. The working air is guided and ejected from the outlet 26 of the air passage 24.

On a surface of the wall plate 18 of the casing 10 opposite to the guide plate 20, a cylindrical body 2 having both ends open.
8 is attached via the sealing material 30. This body 2
By fixing 8 and the casing 10, the wall plate 18 becomes one wall surface of the internal space of the body 28. This body 28
An annular holding case 32 having a large thickness is provided in the inside of the body with a slight gap between the body 28 and the wall plate 18. Inside the holding case 32, there are a storage chamber 34 which is an outer annular space and a pressure equalizing chamber 36 which is an annular space which is provided inside the storage chamber 34 and communicates therewith. A fuel absorber described later is provided in the storage chamber 34, and the storage chamber 34 is set so as to communicate only with the pressure equalizing chamber 36. A space between the wall plate 18 and the holding case 32 is a vaporization chamber 38. Since the method of attaching the holding case 32 with a slight distance from the wall plate 18 can be easily performed by known means, the description thereof will be omitted.

The fuel absorber accommodated in the accommodating chamber 34 of the holding case 32 is, in principle, from the side close to the wall plate 18, the first fibrous absorber 40, the first porous absorber 42, and the second fibrous absorber. The fibrous absorber 44 and the second porous absorber 46 are composed of four layers in this order. Of these four layers, the first fibrous absorbent body 40 and the second fibrous absorbent body 44 have a property in which the fuel does not easily permeate and retains the fuel.
The second and second porous absorbers 46 have good thermal conductivity and are easily permeable to fuel. The first fibrous absorber 40 prevents the fuel from leaking out of the holding case 32. The first porous absorber 42 serves as a passage for facilitating the passage of fuel downward. The second fibrous absorber 44 acts as a wall of the passage. Second porous absorber 4
Reference numeral 6 is for contacting the heat receiving portion 48 farthest from the wall plate 18 in the holding case 32, and serves to enhance the efficiency of receiving heat applied to the heat receiving portion 48.

A fuel supply pipe 50 is provided so as to penetrate the cover 12 and the casing 10 and locate an opening inside the holding case 32. The opening position of the fuel supply pipe 50 is within the first porous absorber 42. Alternatively, it may be located at a position facing the first porous absorbent body 42 and in contact with the second fibrous absorbent body 44. That is, the fuel supplied from the fuel supply pipe 50 is absorbed by the second fibrous absorber 44, and the first fibrous absorber 40 and the second fibrous absorber 44 are both the first porous absorber 42. The fuel introduced into the first porous absorber 42 is set so as to flow downward in the inside.

An annular partition wall 52 is provided between the accommodating chamber 34 and the pressure equalizing chamber 36 inside the storage chamber 34. As shown in FIGS. 1 and 3, the partition wall 52 is located below half the height of the partition wall 52. A plurality of primary vaporization holes 54 are provided, and the storage chamber 34 communicates with the pressure equalizing chamber 36 via only the plurality of primary vaporization holes 54. The position of the primary vaporization hole 54 communicating with the pressure equalizing chamber 36 is such that the fuel does not come out into the pressure equalizing chamber 36 in a liquid state where the fuel is not sufficiently vaporized, and the pressure equalizing is performed after the fuel is sufficiently vaporized. The chamber 36 is set to discharge vaporized fuel. The holding case 32 is provided with a jet port 58 on a wall surface 56 (a surface opposite to the heat receiving portion 48) separating the pressure equalizing chamber 36 and the vaporizing chamber 38. That is, the pressure equalizing chamber 36 communicates with the vaporizing chamber 38 through the ejection port 58, and the vaporizing chamber 38
Other than the above are not connected to the outside (the inner surface of the pressure equalizing chamber 36 is closed by a mixing pipe 64 for mixing air and vaporized fuel).

Inside the body 28, the main space facing the heat receiving portion 48 of the holding case 32 is a combustion chamber 60. The holding case 32 is arranged such that its annular axis is the same as the tubular axis of the body 28, and an annular outer wall of the holding case 32 and an inner wall of the body 28 have an annular shape. A communication passage 62, which is a gap between the two, is formed. One of the communication passages 62 is the combustion chamber 60.
And the other communicates with the vaporization chamber 38, and the vaporization chamber 38 is set so as not to directly face the combustion chamber 60.

A cylindrical mixing tube 6 which penetrates through the center of the heat receiving portion 48 of the holding case 32 and has one end opened and the other end closed.
4 is attached to the holding case 32. This mixing tube 6
The opening of No. 4 faces the wall plate 18, and the central axis of the mixing pipe 64 is set so as to coincide with the central axis of the tubular portion 22 formed on the wall plate 18.
The inner diameter of is larger than the outer diameter of the cylindrical portion 22. As shown in FIG. 1, the cylindrical portion 22 provided in the casing 10
It is preferable that the tip end opening of the above does not enter the opening of the mixing tube 64. The opening at the tip of the outlet 26 of the tubular portion 22 may be inside the opening of the mixing tube 64. The internal space of the mixing pipe 64 communicates with the vaporization chamber 38 through a gap between the opening of the mixing pipe 64 and the tip of the tubular portion 22. As shown in FIG. 3, a large number of jet nozzles 58 are evenly provided around the opening of the mixing tube 64 described later. The closed front end surface of the mixing pipe 64 is located at a position that sufficiently projects into the combustion chamber 60 from the position of the heat receiving portion 48 of the holding case 32, and the mixing pipe 64 has a cylindrical outer periphery that projects into the combustion chamber 60. A large number of injection holes 66 that serve as flame openings are provided. The injection hole 6 is provided near the opening of the mixing pipe 64.
6 is not provided, and the portion of the mixing pipe 64 where the injection hole 66 is not provided forms the inner wall surface of the pressure equalizing chamber 36.

A glow plug 68 is provided as an ignition means which penetrates the wall plate 18 and the holding case 32 and generates heat over the entire length thereof. That is, this glow plug 6
Reference numeral 8 penetrates the four-layer fuel absorber, and the tip thereof is the combustion chamber 6
It projects into 0. The glow plug 68 is provided in the storage chamber 3
It is set to be located on the lower side of 4. The glow plug 68 not only functions to ignite the air-fuel mixture ejected into the combustion chamber 60, but also functions to heat the fuel absorber 34. The glow plug typically consists of a ceramic such as silicon nitride and a tungsten wire embedded within the ceramic. The structure of the glow plug is not limited to this. Here, as shown in FIG. 4, in the fuel absorber facing the heat receiving portion 48 (where the second porous absorber 46 is provided), there is no fuel leakage from around the glow plug 68. Thus, the third fibrous absorbent body 70 is provided.

Next, the function of the evaporative burner will be described. The air that has entered the air swirl chamber 14 from the air introduction port 16 is swirled by the guide plate 20 and is collected in the center of the air swirl chamber 14, and thereafter enters the air passage 24 in a spiral shape, and the air While being maintained in a spiral shape from the outlet 26 of the passage 24, it is introduced from the opening of the mixing tube 64 toward the inside thereof. On the other hand, fuel is constantly supplied from the fuel supply pipe 50 to the four-layer fuel absorber provided in the holding case 32, and at the time of ignition, the four-layer fuel absorber is penetrated by the glow plug 68 penetrating the four-layer fuel absorber. The absorber is heated.

The fuel from the fuel supply pipe 50 is supplied to the first porous absorber 42 of the four-layer fuel absorber. Since the first porous absorbent body 42 is sandwiched between the walls of the first fibrous absorbent body 40 and the second fibrous absorbent body 44 that are difficult to permeate the fuel and retain the fuel, The fuel introduced into the porous absorbent body 42 moves inside the first porous absorbent body from top to bottom. The fuel moving downward in the first porous absorber 42 is heated by the glow plug 68 at the time of ignition, and after the ignition, the heat of conduction from the heat receiving portion 48 of the holding case 32 and the combustion gas reaching the vaporization chamber 38. It is heated by the glow plug 68 penetrating its inside. The fuel moving downward in the first porous absorber 42 is discharged as vaporized fuel from the primary vaporization hole 54 to the pressure equalizing chamber 36 in a sufficiently vaporized state.

When the fuel is heavy oil, the first fibrous absorber 40, the second fibrous absorber 44, and the third fibrous absorber 70 prevent the fuel from flowing out to the outside of the first porous body. The fuel is passed through only the absorbent material 42 to promote vaporization of the fuel. Further, the second porous absorber 46 improves the heat receiving efficiency and helps vaporize the fuel flowing through the first porous absorber 42. Thus, in the case of heavy oil,
By forming the fuel absorber into a plurality of layers, the region in which the heavy oil flows is narrowed to improve the vaporization efficiency of the heavy oil, and the second porous absorber 46 between which the heavy oil flows is sandwiched. The one fibrous absorber 40 and the second fibrous absorber 44 prevent the fuel from leaking.

The vaporized fuel vaporized in the accommodating chamber 34 containing the four-layer fuel absorber is discharged into the pressure equalizing chamber 36 through the primary vaporizing holes 54, and is temporarily stored in the pressure equalizing chamber 36. It is in a uniform state. The vaporized fuel homogenized in the pressure equalizing chamber 36 is then passed through a large number of ejection ports 58 and then vaporized in the vaporizing chamber 38.
Gushes into. Since the multiple jet outlets 58 are evenly arranged around the opening of the mixing pipe 64, the vaporized fuel is sucked by the flow of the combustion air flowing into the mixing pipe 64 from the outlet 26 of the air passage 24. It is uniformly supplied from the opening of the mixing tube 64 to the inside. In this way, the vaporized fuel is temporarily stored in the pressure equalizing chamber 36, and is further homogenized from a large number of ejection ports 58 and supplied to the vaporizing chamber 38. That is, since the fuel absorber is not directly exposed to the high temperature part (vaporization chamber 38 or combustion chamber 60), when heavy oil is used as a fuel, adhesion of carbide residue to the fuel absorber is suppressed. You can In addition, a large number of vaporized fuel injection ports 58 to the vaporization chamber 38 are provided.
Are evenly arranged around the opening of the mixing pipe 64, the air and vaporized fuel in the mixing pipe 64 are evenly mixed, and the combustion is performed radially from the injection holes 66 formed in the mixing pipe 64. The unevenness of the flame injected into the chamber 60 is eliminated.

The air-fuel mixture injected into the combustion chamber 60 is ignited by a glow plug 68 protruding right beside the mixing tube 64.
Is ignited by. In the conventional one in which the combustion air and the fuel are separately introduced into the combustion chamber, the flame is generated from the position where the combustion air and the vaporized fuel are mixed, but in the present invention, the combustion air and the fuel are When the air-fuel mixture is preliminarily set as the air-fuel mixture, and the air-fuel mixture is jetted into the combustion chamber 60, the air-fuel mixture immediately becomes a flame, and a flame train is radially formed in the combustion chamber 60. It can be shorter than that.

The heat receiving portion 48 of the holding case 32 is heated by the combustion gas generated by the combustion of the air-fuel mixture in the combustion chamber 60, and the conductive heat from the heat receiving portion 48 heats the four-layer fuel absorber. It On the other hand, a part of the combustion gas generated in the combustion chamber 60 is vaporized from the communication passage 62 between the cylindrical outer wall of the holding case 32 and the inner wall of the body 28 by the sucking action of the combustion air flowing in the mixing pipe 64. It is allowed to flow into the chamber 38. The heat of the circulating combustion gas toward the vaporization chamber 38 also heats the four-layer fuel absorber, and the fuel is continuously vaporized from the fuel absorber. Since oxygen is not present in the communication passage 62 and the vaporization chamber 38, the combustion gas ignited in the combustion chamber 60 is extinguished when entering the communication passage 62. That is, depending on the combustion gas flowing from the combustion chamber 60 into the vaporization chamber 38, the ejection port 58
The vaporized fuel ejected from the vaporization chamber 38 is not ignited.

Here, the holding case 32 may be replaced by the holding case 72 shown in FIG. 5 instead of the one shown in FIG. That is, the shape of the pressure equalizing chamber 74 may not be an annular shape as shown in FIG. 1, but a thick disk-shaped space may be integrally connected to the wall plate 18 side of the annular shape. Thereby, the vaporized fuel can be stored for a longer time in the pressure equalizing chamber 74, and the vaporized fuel can be made more uniform. Further, the holding case 32 may be configured as shown in FIG. 6 instead of that shown in FIG. 6 differs from FIG. 1 in that the partition wall 52 of FIG. 1 is a uniform annular body, whereas the annular partition wall 76 has a tapered axial height as shown in FIG. That is the point. That is, the fuel absorbers of the four layers are exposed in the pressure equalizing chamber 36 at the lower position, and the exposure ratio is set to be larger at the lower position. As a result, the fuel does not drip into the pressure equalizing chamber 36 in a liquid state, and vaporization of the fuel into the pressure equalizing chamber 74 is further promoted.

[0022]

[Second Embodiment] Next, FIG. 8 shows another embodiment of the present invention. This example relates to the case of using a highly volatile fuel such as kerosene or gasoline. This Figure 8
1 differs from the embodiment shown in FIG. 1 in that the number and layers of layers of the fuel absorber accommodated in the holding case 32, the thickness of the fuel supply pipe 50, and the heat insulating member pipe covered with the fuel supply pipe 50. Is. In this embodiment, the same reference numerals as those in the first embodiment indicate the same parts. Storage room 3 for holding case 32
A porous absorbent body 78 having good thermal conductivity and being easily permeated with fuel is provided in almost all of the area within 4. In the storage chamber 34 of the holding case 32, a first fibrous absorber 80 having a property of hardly permeating the fuel and holding the fuel is provided at the opening position of the fuel supply pipe 50. In addition, glow plug 68
The second fibrous absorbent body 82 having a property of hardly permeating the fuel and holding the fuel is provided at the penetrating position of. The second fibrous absorber 82 prevents fuel from leaking from the position of the glow plug 68.

When a highly volatile fuel is used, the fuel supply pipe 50 is vaporized while passing through the high temperature vaporization chamber 38, and the fuel is intermittently supplied to the fuel absorber. However, since the opening position of the fuel supply pipe 50 is surrounded by the first fibrous absorber 80, the fuel introduced from the fuel supply pipe 50 is received by the first fibrous absorber 80 having low permeability, There it is held once. Therefore, even if the fuel supplied from the fuel supply pipe 50 is intermittent, the fuel is temporarily held by the first fibrous absorber 80 in the holding case 32, and the fuel is evenly distributed to the porous absorber 78. Send out. As a result, the vaporization of the fuel from the porous absorber 78 in the holding case 32 to the pressure equalizing chamber 36 is continued, and as a result, the fading or pulsation of the flame due to the burner is suppressed.

In order to make the intermittent flow of the fuel as close as possible to the continuous flow, it is desirable to use a pipe having an inner diameter of 1 mm or less for the fuel supply pipe 50. By setting the inner diameter of the fuel supply pipe 50 to 1 mm or less, the velocity of the fuel flowing through the fuel supply pipe 50 is increased, so that even if the fuel passes through the high temperature vaporization chamber 38, the fuel is vaporized at that position. There is no such thing. Further, if a heat insulating pipe 84 is provided outside the fuel supply pipe 50 at a portion of the fuel supply pipe 50 exposed to the high temperature vaporization chamber 38, the fuel passing through the fuel supply pipe 50 is not heated. , The fuel is not vaporized at that position. In addition,
The shape of the pressure equalizing chamber 36 shown in FIG. 8 is not limited to that shape, and may be a shape corresponding to that of FIG.

[0025]

As described above, according to the evaporative burner according to the present invention, the fuel vaporized from the fuel absorber is temporarily stored in the pressure equalizing chamber and made uniform, and then uniformly introduced into the opening of the mixing tube. As a result, air and vaporized fuel can be mixed uniformly, and combustion efficiency can be improved. Further, since the fuel absorber is isolated from the high temperature vaporization chamber and the combustion chamber, the flame of the combustion chamber does not directly reach the fuel absorber, and the accumulation of carbide on the fuel absorber can be suppressed. Furthermore,
When the fuel used is heavy oil, the fuel absorber is made up of multiple layers of a material that does not easily permeate the fuel and a material that allows the fuel to easily permeate, and a narrow area where the fuel is easily permeated By introducing the fuel into the body, the vaporization property of the heavy oil can be improved and the leakage of the heavy oil can be prevented. Also,
When the fuel used is a highly volatile fuel such as gasoline, the fuel to the fuel absorber is covered by covering the opening of the fuel supply pipe in the fuel absorber with a material that does not allow the fuel to easily permeate and retains the fuel. Even if it is intermittent, it is possible to continuously evaporate the fuel and suppress the occurrence of flame pulsation and pulsation of the burner flame. In the case of highly volatile fuel such as gasoline, by further reducing the inner diameter of the fuel supply pipe and covering the outside of the portion exposed to the high temperature vaporization chamber with a heat insulating material, the fuel inside the fuel supply pipe Vaporization can be prevented and the continuity of fuel supply can be maintained.

[0026]

[Brief description of drawings]

FIG. 1 is a sectional view of an evaporative burner according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a side view of a holding case used in the evaporative burner according to the present invention.

FIG. 4 is a sectional view taken along line BB of the holding case used in the evaporative burner according to the present invention.

FIG. 5 is a sectional view of an essential part showing another embodiment of a holding case using an evaporative burner according to the present invention.

FIG. 6 is a cross-sectional view of essential parts showing another embodiment of the holding case using the evaporative burner according to the present invention.

FIG. 7 is a perspective view of a wall surface of a holding case using an evaporative burner according to the present invention.

FIG. 8 is a sectional view showing another embodiment of the evaporative burner according to the present invention.

9 is a cross-sectional view taken along the line CC of FIG.

10 is a cross-sectional view taken along line DD of FIG.

[Explanation of symbols]

 14 Air Swirling Chamber 20 Guide Plate 28 Body 32 Holding Case 36 Pressure Equalizing Chamber 38 Vaporizing Chamber 40 First Fibrous Absorber 42 First Porous Absorber 44 Second Fibrous Absorber 46 Second Porous Absorber 50 Fuel supply pipe 54 Primary vaporization hole 58 Jet port 60 Combustion chamber 62 Communication passage 64 Mixing pipe 66 Injection hole 68 Glow plug 72 Holding case 74 Pressure equalizing chamber 78 Porous absorber 80 First fibrous absorber 82 Second fibrous absorber Body 84 insulation tube

Claims (6)

[Claims] 1. A fuel is introduced into a fuel absorber through a fuel supply pipe, and the fuel contained in the fuel absorber is vaporized,
In the evaporative burner in which combustion air is mixed with the vaporized fuel to form an air-fuel mixture, and the air-fuel mixture is ignited by a heat generating means in a combustion chamber provided inside a tubular body, the fuel absorber is provided in the combustion chamber. A storage case having a storage chamber that is stored in a state where the storage chamber is not exposed directly, and a holding case facing the combustion chamber, and a storage case that is provided adjacent to the holding case and communicates with the combustion chamber and occurs in the combustion chamber. A vaporization chamber adapted to introduce a part of the combustion gas in a flameless state, a pressure equalizing chamber communicating one with the storage chamber and the other with the vaporization chamber, and means for giving a swirling force to the combustion air. An air swirl chamber provided with, a mixing pipe having one end protruding into the combustion chamber and an opening at the other end communicating with the air swirl chamber and the vaporization chamber, and the inside of the mixing pipe and the combustion chamber. To contact A plurality of injection holes formed in the mixing pipe at a portion protruding into the combustion chamber, and the fuel absorption by the heat of the combustion gas generated in the combustion chamber and the heat of a part of the combustion gas passing through the vaporization chamber. The fuel introduced into the body was vaporized, the vaporized fuel was made uniform in the pressure equalizing chamber and jetted into the vaporization chamber, and the vaporized fuel jetted in the vaporization chamber was given a swirling force in the air swirling chamber. Evaporation formula characterized by introducing into the mixing pipe by combustion air, mixing vaporized fuel and combustion air in the mixing pipe, and injecting the mixture into the combustion chamber through injection holes provided in the mixing pipe Burner. 2. A communication passage is formed between an inner peripheral wall of the body and an outer peripheral wall of the holding case so that one communicates with the combustion chamber and the other communicates with the vaporization chamber, and is injected into the combustion chamber for combustion. 2. The evaporative burner according to claim 1, wherein a part of the combustion gas is circulated from the communication passage to the inside of the mixing pipe through the vaporization chamber. 3. The heat generating means is a glow plug having a rod-shaped heat generating portion, the glow plug penetrates the fuel absorber, the tip of the glow plug is located in the combustion chamber, and the fuel supply pipe is arranged at a higher position. 2. The evaporative burner according to claim 1, wherein the heat generating means is arranged at a lower position, and a region communicating from the fuel absorber to the pressure equalizing chamber is made wider on a lower side than an upper side. 4. A plurality of jet outlets are provided at the connection points from the pressure equalizing chamber to the vaporizing chamber, and the plurality of jet outlets are evenly arranged around the opening of the mixing pipe. Item 1. The evaporative burner according to Item 1. 5. A pair of fibrous absorbers having a property that the fuel absorber housed in the holding case has a property of at least hardly permeating the fuel and holding the fuel, and heat conduction sandwiched between the pair of fibrous absorbers. 2. The evaporative burner according to claim 1, wherein the evaporative burner is composed of a porous absorbent body having good properties and easily permeating fuel, and a fuel supply pipe is opened in the porous absorbent body. 6. The evaporative burner according to claim 1, wherein the inner diameter of the fuel supply pipe is 1 mm or less, and the outside of the portion of the fuel supply pipe exposed to the vaporization chamber is covered with a heat insulating pipe. .