JPH11182812A - Burner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain the generation of soot in a combustion rate variable type burner. SOLUTION: A burner is provided with an end unit open type nozzle receiving tube 3, accommodating a fuel injection nozzle, an end unit open type combustion tube, connected to the open end of the nozzle receiving tube 3, and a fan, for supplying air into the combustion tube, while the burner is capable of regulating a fuel supplying amount and a ventilating amount. The combustion tube is constituted of a first combustion tube 6a, connected to the open end of the nozzle receiving tube 3, and a second combustion tube 6b, connected to the first combustion tube 6a and provided with a larger diameter than that of the first combustion tube 6a. The first combustion tube 6a is provided with a first flange unit, connected to the open end of the nozzle receiving tube 3 and equipped with a first air stream whirler, while the second combustion tube 6b is provided with a second flange unit, connected to the first combustion tube 6a and equipped with a second air stream whirler. A plurality of air outlet ports, arrayed circumferentially on the second air stream whirler, are provided at positions nearer to the internal periphery than the center of inner and outer periphery of the second flange so that an area, in which oxygen is insufficient, will hardly be generated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a burner, and more particularly, to a variable burner which can change a combustion amount using kerosene or the like as a fuel.

[0002]

2. Description of the Related Art A variable combustion rate gun type burner using a so-called two-stage combustion cylinder for burning liquid fuel in an oil water heater or the like has been conventionally known. An example of such a burner according to the prior art is shown in FIGS. This burner is provided with a heat exchanger 5 provided thereunder.
For heating 0, the airflow in the burner is almost downward. Such a configuration may include a silencer (not shown)
Is often used to save space by providing a compact. In this burner, the fuel injected from the nozzle 7 is mixed with the air from the blower 1, ignited by the spark plug 8, and burns mainly in the combustion cylinder 6. Nozzle storage tube 3 containing fuel injection nozzle 7 and spark plug 8
Is a nozzle housing inner cylinder 3 directly incorporating the fuel injection nozzle 7
a and a nozzle housing outer cylinder 3b provided outside thereof.

The combustion cylinder 6 comprises a first combustion cylinder 6a connected to the open end of the nozzle housing cylinder 3, and a second combustion cylinder 6b further connected to the cylinder 6a and having a larger diameter than the cylinder 6a. The first combustion cylinder 6 a has a first flange portion 13 connected to the open end of the nozzle housing cylinder 3 and a first combustion cylinder main body 14 connected to the first flange portion 13. The air swirler 15 and the first combustion cylinder main body 14 have a plurality of air holes 1.
2a, the second combustion cylinder 6b includes a second flange portion 23 connected to the first combustion cylinder main body 14, and the second flange portion 23
The second flange portion 23 has a second airflow swirler 25, and the second combustion cylinder body 24 has a plurality of air holes 12b. First airflow swirler 15
And the second airflow swirler 25 are provided with swirling blades 16 and 26, respectively, and transfer air flowing from the air case 2 into the first combustion cylinder 6a and the second combustion cylinder 6b in the circumferential direction (tangential direction) of each cylinder. It is to be introduced toward.
Usually, the swirl vanes 16, 26 are manufactured by a simple method such as cutting and raising or pressing.

[0004] After the air from the blower 1 is sent to the air case 2, it is used for combustion as described below. The air that has entered the inside of the nozzle housing inner cylinder 3a from the air hole 10 provided on the side surface of the nozzle housing inner cylinder 3a passes around the fuel injection nozzle 7, mixes with the fuel injected from the nozzle 7 and burns. It flows into the cylinder 6. Although the combustion starts near the spark plug 8, the combustion is mainly performed inside the combustion cylinder 6 because the airflow is directed to the combustion cylinder 6. Also,
The air that has flowed into the nozzle housing outer cylinder 3b from the air holes 11 provided on the side surface of the nozzle housing outer cylinder 3b is sent from the first airflow swirler 15 into the first combustion cylinder 6a and is converted into gas in the same cylinder 6a. Adds a flame holding effect. That is, the air flowing in from the first airflow swirler 15 is given a circumferential velocity by the first swirler 16 and swirls inside the first combustion cylinder 6 a, so that a negative pressure region is provided in front of the first swirler 16. The liquid fuel particles and combustible gas are attracted to this negative pressure region, and are newly mixed with air and burned. The air that has flowed into the cylinder 6a from the air holes 12a provided on the side surface of the first combustion cylinder 6a agitates the gas in the cylinder 6a and converts the liquid fuel particles and combustible gas remaining in the gas into oxygen. Supply and burn. Similarly to the first airflow swirler 15, the second combustion cylinder 6b
The air flowing into the cylinder also adds a flame holding effect to the gas in the cylinder 6b. This air is given a circumferential velocity by the second swirling vanes 26 and swirls inside the second combustion cylinder 6b,
A negative pressure region is generated in front of the second swirling blade 26, and the liquid fuel particles and combustible gas that cannot be completely burned in the first combustion cylinder 6a are attracted to the negative pressure region, and are newly mixed with air and burned. . The air flowing into the cylinder 6b from the air holes 12b provided on the side surface of the second combustion cylinder 6b agitates the gas in the cylinder 6b and converts oxygen into liquid fuel particles and combustible gas remaining in the gas. Supply and burn.

The number of revolutions of the fan motor of the blower 1 is controlled in accordance with an input (fuel supply amount) by a known control method such as proportional control. In this type of burner, when the input is small, the amount of air is reduced and the combustion is performed only inside the first combustion cylinder 6a having a small diameter. On the other hand, when the input is large, the amount of air is increased and the combustion is reduced. Since it is performed not only inside the one combustion cylinder 6a but also inside the large-diameter second combustion cylinder 6b,
A relatively good combustion state is obtained from a small input range to a large input range. Further, the flame is shortened even in the large input range, so that the distance to the heat exchanger is shortened, and the water heater can be downsized.

[0006]

However, in the burner according to the prior art, the problem that soot is easily generated at the boundary between the first combustion cylinder 6a and the second combustion cylinder 6b has not been sufficiently overcome. That is, in the burner of the related art, soot is generated in the portion, and the soot is generated in the first combustion cylinder
It grows by adhering to the inner peripheral surface of a. This is thought to be due to the lack of air supply to the inside, resulting in an oxygen-deficient region, in which fuel that could not be burned produces soot, but no solution has been found.

In order to simplify the manufacturing method, the swirl vanes 16 and 26 are often manufactured by cutting and raising the first flange portion 13 and the second flange portion 14 by a method such as pressing. In these manufacturing methods, the processing accuracy is poor, the processing variation is large, the air passage area and air resistance are not constant, the flame holding state and the combustion state in the airflow swirler are not stable, and this also causes soot generation. I was invited.

The present invention has been made in view of the above-mentioned problems of the prior art,
An object of the present invention is to provide a variable combustion burner that suppresses the generation of soot and has a stable combustion state.

[0009]

According to a first aspect of the present invention, there is provided a first burner including an open-end nozzle housing cylinder having a built-in fuel injection nozzle, and an end portion connected to an open end of the nozzle housing cylinder. In a burner provided with an open-type combustion cylinder and burning by receiving air supplied from a blower, the combustion cylinder is further connected to a first combustion cylinder connected to an open end of the nozzle storage cylinder and the first combustion cylinder. The first combustion cylinder has a first flange portion connected to the open end of the nozzle housing cylinder and a first combustion cylinder body connected to the first flange portion. The first flange portion includes a first airflow swirler, and the second combustion cylinder has a second flange portion connected to the first combustion cylinder main body and a second combustion cylinder main body connected to the second flange portion. , The second flange portion is provided with a second airflow swirler, A burner having a plurality of outlets arranged in a circumferential shape, wherein a blowing direction from the outlet is directed inward from a tangential direction of a trajectory in which the outlets are arranged. .

In the burner according to the prior art, since the airflow blown into the second combustion cylinder from the outlet of the second airflow swirler goes tangentially, air is supplied to the inside, especially to the boundary side with the first combustion cylinder. Insufficient oxygen caused an oxygen-deficient region, and the fuel that could not be burned in this region became soot. On the other hand, in the burner of the present invention, the outlet of the second airflow swirler is directed inward, and the air flowing into the second combustion cylinder is also supplied inward from the outlet, so that the conventional An oxygen-deficient region is unlikely to occur in the portion where soot has been generated, and soot generation is suppressed. In the present invention, since the airflow blown into the second combustion cylinder is directed toward the center, the unburned gas and the burned gas that have passed through the first combustion cylinder and flowed into the center of the second combustion cylinder are centrifuged. Spread by airflow. Therefore, not only the occurrence of the above-mentioned soot is further suppressed, but also the shortening of the flame is promoted, and the size of the combustion chamber up to the heat exchanger in front of the combustion cylinder can be reduced.

The tangential direction of the trajectory in which the outlets are arranged refers to the tangential direction of a circle when the second airflow swirler is arranged in a circle. When the outlet is non-circular such as an ellipse, the direction is perpendicular to the radius of curvature.

[0012] A second burner for solving the above-mentioned problems includes an open-ended nozzle housing cylinder having a built-in fuel injection nozzle, and an open-ended combustion cylinder connected to the open end of the nozzle housing cylinder. In a burner that receives and supplies air from a blower and burns, the combustion cylinder has a first combustion cylinder connected to an open end of the nozzle storage cylinder and a large-diameter second combustion cylinder further connected to the first combustion cylinder. The first combustion cylinder has a first flange portion connected to the open end of the nozzle housing cylinder and a first combustion cylinder main body connected to the first flange portion. Has a first airflow swirler, the second combustion cylinder has a second flange portion connected to the first combustion cylinder main body and a second combustion cylinder main body connected to the second flange portion, and the second flange portion Comprises a second airflow swirler, the second airflow swirler being arranged in a A plurality of air outlet has, the air outlet is a burner, characterized in that provided at a position of the inner peripheral nearer the center of the inner periphery of the second flange portion.

In the burner of the present invention, the outlet is provided on the inner side as compared with the conventional one. Therefore, in the burner of the present invention, an oxygen-deficient region is unlikely to occur in a portion where soot has conventionally occurred, and the occurrence of soot is suppressed. Also in this burner, since the air flow blown into the second combustion cylinder goes to the vicinity of the center, unburned gas and burned gas that have passed through the first combustion cylinder and flowed into the center of the second combustion cylinder are discharged. Entangled in a centrifugal airflow and diffused. Therefore, not only the occurrence of the above-mentioned soot is further suppressed, but also the shortening of the flame is promoted, and the size of the combustion chamber up to the heat exchanger in front of the combustion cylinder can be reduced.

[0014] A third burner for solving the above-mentioned problem is to provide an open-ended nozzle housing cylinder having a built-in fuel injection nozzle, and an open-ended combustion cylinder connected to the open end of the nozzle housing cylinder. In a burner that receives and supplies air from a blower and burns, the combustion cylinder has a first combustion cylinder connected to an open end of the nozzle storage cylinder and a large-diameter second combustion cylinder further connected to the first combustion cylinder. The first combustion cylinder has a first flange portion connected to the open end of the nozzle housing cylinder and a first combustion cylinder main body connected to the first flange portion. Has a first airflow swirler, the second combustion cylinder has a second flange portion connected to the first combustion cylinder main body and a second combustion cylinder main body connected to the second flange portion, and the second flange portion Has a second airflow swirler, and the second airflow swirler has a plurality of outlets. The blow-out port is formed in a shape that blows air supplied from the blower to the second combustion cylinder in a circumferential direction in the second flange portion, and the first combustion cylinder is expanded forward with the enlarged-diameter flange portion. Having a diameter tube portion, the inner surface of the diameter expansion tube portion is fitted with the outer surface of the second combustion cylinder, and the front surface of the diameter expansion flange portion overlaps the rear surface of the second flange portion of the second combustion tube. Connected, the enlarged-diameter flange portion is formed with an enlarged-diameter flange air hole corresponding to the position of the outlet of the second airflow swirler, and the blower is blown from the blower via the enlarged-diameter flange air hole. A burner characterized in that air is supplied to a mouth.

In this burner, while the second airflow swirler is manufactured by a simple method, the amount of swirling air by the second airflow swirler can be determined by drilling such as punching with high processing accuracy. In addition, the processing variation for each burner is reduced, and the flame holding state and the combustion state in the second airflow swirler are stabilized. That is, in the burner of the present invention,
The enlarged-diameter flange air hole is arranged in accordance with the position of the outlet, and air is supplied to the outlet through the enlarged-diameter flange air hole. Therefore, in the burner of the present invention, the amount of air blown out from each outlet is determined by the opening area of the air hole. The holes can be formed with high precision by punching or the like. Therefore, in the burner of the present invention, the amount of air blown out from each outlet is ideal, and stable combustion is ensured. As a result, the occurrence of soot is suppressed. In addition, the front surface of the enlarged diameter flange portion refers to the front surface of the flame injected from the fuel injection nozzle, and when the flame is injected downward, the lower surface of the enlarged diameter flange portion.

According to a fourth aspect of the present invention, there is provided a burner including an open-ended nozzle housing cylinder having a built-in fuel injection nozzle and an open-ended combustion cylinder connected to an open end of the nozzle housing cylinder. In a burner that receives and supplies air from a blower and burns, the combustion cylinder has a first combustion cylinder connected to an open end of the nozzle storage cylinder and a large-diameter second combustion cylinder further connected to the first combustion cylinder. The first combustion cylinder has a first flange portion connected to the open end of the nozzle housing cylinder and a first combustion cylinder main body connected to the first flange portion. Has a first airflow swirler, the second combustion cylinder has a second flange portion connected to the first combustion cylinder main body and a second combustion cylinder main body connected to the second flange portion, and the second flange portion Has a second airflow swirler, and the second airflow swirler has a plurality of outlets. The outlet is formed in such a manner that air supplied from the blower to the second combustion cylinder is blown out in a circumferential direction in the second flange portion, and is further supplied from the blower to the second airflow swirler. A swirling air adjusting means for adjusting the amount of air to be supplied to the second flange portion.

In this burner, since the amount of air blown out from each outlet is determined by the swirling air adjusting means provided in the second flange portion, the amount of air blown out from each outlet is ideal. Stable combustion is ensured. As a result, the occurrence of soot is suppressed. As the swirling air adjusting means, for example, two annular plates having a hole slightly larger in diameter than the first combustion cylinder main body at the center and having air holes are superposed concentrically, and the relative The effective area of the air hole is maximized when the air holes of both annular plates match, and the effective area of the air hole decreases as the two annular plates are shifted. In this way, a device that can determine the amount of air blown from each outlet by changing the setting of the effective area of the air hole may be used. Also, just 1
It is also possible to use one that determines the air supply amount by using a perforated annular plate.

According to a fifth aspect of the present invention, there is provided a burner including an open-ended nozzle housing cylinder having a built-in fuel injection nozzle, and an open-ended combustion tube connected to an open end of the nozzle housing tube. In a burner that receives and supplies air from a blower and burns, the combustion cylinder has a first combustion cylinder connected to an open end of the nozzle storage cylinder and a large-diameter second combustion cylinder further connected to the first combustion cylinder. The first combustion cylinder has a first flange portion connected to the open end of the nozzle housing cylinder and a first combustion cylinder main body connected to the first flange portion. Has a first airflow swirler, the second combustion cylinder has a second flange portion connected to the first combustion cylinder main body and a second combustion cylinder main body connected to the second flange portion, and the second flange portion Has a second airflow swirler, and the second airflow swirler has a plurality of outlets. The blowout port is formed in a shape that blows air supplied from the blower to the second combustion cylinder in a circumferential direction at a second flange portion, and the combustion cylinder further has an annular swirling air adjustment plate. Is connected so that the front surface thereof overlaps with the rear surface of the second flange portion of the second combustion cylinder, and the swirling air adjustment plate air is adjusted to the position of the outlet of the second airflow swirler on the swirling air adjustment plate. A burner, wherein a hole is formed, and air is supplied from the blower to the outlet through the swirling air adjusting plate air hole.

Also in this burner, while the second airflow swirler is manufactured by a simple method, the amount of air blown out from each outlet of the second airflow swirler by hole machining such as punching with high processing accuracy. Can be determined. Therefore, the processing variation of each burner is reduced, the flame holding state and the combustion state in the second airflow swirler are stabilized, and the generation of soot is suppressed. In addition, the front surface of the swirling air adjustment plate refers to the front surface of the flame injected from the fuel injection nozzle, and refers to the lower surface of the swirling air adjustment plate when the flame is injected downward.

A sixth burner for solving the above-mentioned problems has a feature of a fifth burner, and the turning air adjusting plate has bent portions at an outer peripheral end and an inner peripheral end, respectively. The burner is characterized in that the inner surface of the bent portion at the outer peripheral end is fitted to the outer surface of the second combustion cylinder, and the inner surface of the inner peripheral end is fitted to the outer surface of the first combustion cylinder.

In this burner, the sealing performance of the joint surface between the combustion cylinder and the swirling air adjusting plate is improved. Further, the strength is improved by the presence of the bent portion, and the swirling air adjustment plate is less likely to be thermally deformed even when the temperature of the combustion cylinder becomes high.

[0022]

1 to 6 show an embodiment of a burner according to the present invention. In this burner, the same or similar parts as those in the conventional burner shown in FIGS. The burner according to the present invention is, like the conventional burner, an open-ended nozzle housing cylinder 3 having a built-in fuel injection nozzle 7 and an open-ended combustion tube 6 connected to the open end of the nozzle housing tube 3. And a blower 1 that supplies air to the combustion cylinder 6, and is capable of adjusting the amount of fuel supplied to the fuel injection nozzle 7 and the amount of air blown from the blower 1. As shown in FIGS. 1, 2, and 3, the combustion cylinder 6 includes a first combustion cylinder 6a connected to the open end of the nozzle housing cylinder 3 and a cylinder 6a further connected to the first combustion cylinder 6a. The first combustion cylinder 6a is composed of a large-diameter second combustion cylinder 6b, and the first combustion cylinder 6a is connected to the open end of the nozzle housing cylinder 3 and the first combustion cylinder main body 14 connected to the first flange 13 The first flange portion 13 is provided with a first airflow swirler 15, the first combustion cylinder main body is provided with a plurality of air holes 12 a, and the second combustion cylinder 6 b is connected to the first combustion cylinder main body 14. It has a second flange portion 23 and a second combustion cylinder main body 24 connected to the second flange portion 23, a second airflow swirler 25 in the second flange portion 23, and a plurality of air holes 12b in the second combustion cylinder main body. It has. The first airflow swirler 15 has a plurality of air holes 17 arranged circumferentially, and the second airflow swirler 25 has a plurality of air holes 27 arranged circumferentially.

As shown in FIGS. 2, 3 and 4, the outlet 27 of the second airflow swirler 25 is provided with a long hole 28 in the second flange portion 23 in the radial direction. 2
3 is manufactured by bending a part of the sheet 3 by press working to form a curved portion 26 corresponding to the swirling blade. Here, the reason why the pores 28 are opened is to make it difficult for burrs to appear during processing. Note that the outlet 27 is preferably formed by cutting and raising or press working from the viewpoint of easy processing.

Here, in the present embodiment, the direction of air flow from the air outlet 27 of the second airflow swirler 25 is inward (combustion) from the tangential direction of the circle in which the air outlets 27 are arranged as shown in FIG. (The direction of the center of the cylinder 6). That is, as in the present embodiment, the second airflow swirler 25
If the air outlet 27 is slightly inwardly directed, the air is well supplied to the center side of the second combustion cylinder 6b, and the generation of soot is suppressed. The inclination angle θ between the blowing direction from the outlet 27 and the tangential direction of the circle is preferably about 10 ° to 45 °, and most preferably about 25 ° to 35 °.

Further, in this embodiment, the outlet 27 of the second airflow swirler 25 is provided at a position closer to the inner periphery than the center of the inner periphery of the second flange portion 23.
Therefore, a region with insufficient air hardly occurs inside the second combustion cylinder 6b, and the occurrence of soot is suppressed.

In addition, in the present embodiment, as shown in FIG.
However, the front surface (lower surface) of the swirling air adjustment plate is the second combustion cylinder 6
It is attached so as to be in close contact with the rear surface (upper surface) of the second flange portion 23 of b. The swirling air adjusting plate 30 has a swirling air adjusting plate air hole 31 formed by punching or drilling a hole in accordance with the position of the outlet 27 of the second airflow swirler. The air is supplied to the outlet 27 through the port. As shown in FIG. 3, the airflow blown into the second combustion cylinder 6 b from the outlet 27 substantially follows the front surface of the second flange portion 23. Since the size of the swirling air adjusting plate air hole 31 is sufficiently smaller than the outlet 27, the amount of air flowing from the second airflow swirler 25 is mainly determined by the size of the swirling air adjusting plate air hole 31. Therefore, by appropriately designing the size of the swirling air adjusting plate air holes 31, it is possible to make the amount of air flowing from the second airflow swirler 25 ideal.

The swirling air adjusting plate 30 is shown in FIG.
The swirling air adjusting plate air holes 31 are attached so as not to overlap the small holes 28 as shown in FIG. This is supposed to be
When the swirling air adjusting plate air holes 31 overlap the fine holes 28 as in (b), the air flow blows in the axial direction of the second combustion cylinder 6 b without following the front surface of the second flange portion 23, This is because an air-deficient region is generated along the front surface of the flange portion 23 and causes soot. In addition, when the small holes 28 are opened in the second flange portion 23, if there is a gap S between the front surface of the swirling air adjusting plate 30 and the rear surface of the second flange portion 23 as shown in FIG. The axial component of the second combustion cylinder 6b is generated in the air flowing through the port 27, which is not preferable. On the other hand, as shown in FIG. 4 (d), in the case where the outlet 27 is manufactured by making a simple notch without opening the small hole 28 in the second flange portion 23 and then bending a part of the second flange portion 23. There may be a gap S between the front surface of the swirling air adjustment plate 30 and the rear surface of the second flange portion 23.

Conventionally, the amount of air flowing in from the second airflow swirler 25 is determined by the size of the outlet 27, but a part of the second flange portion 23 is deformed by cutting and raising the outlet 27 and pressing. If manufactured, the processing accuracy was poor due to the temperature, the degree of wear of the mold, the presence of burrs, and the like, and the variation in the amount of inflow air from burner to burner was large. That is, in the related art, since the blowout portion is formed only by the cut-and-raised portion, a substantial air passage area changes due to a variation in the cut-and-raised angle and the like. On the other hand, in the burner of the present embodiment, while the second airflow swirler 25 is manufactured by a simple method, the amount of swirling air by the second airflow swirler 25 is determined by the punching hole 31 with high processing accuracy. Therefore, the processing variation of each burner is reduced, and the flame holding state and the combustion state in the second airflow swirler 25 are stabilized. As a result, the occurrence of soot is suppressed.

In the burner of this embodiment, the swirling air adjusting plate 30 has bent portions 30a and 30b at the inner and outer peripheral ends. The inner surface of the bent portion 30a at the inner peripheral end is fitted to the outer surface of the small diameter first combustion cylinder 6a, and the inner surface of the bent portion 30b at the outer peripheral end is fitted to the outer surface of the large diameter second combustion tube 6b. doing. With this configuration, the sealing performance of the joint surface between the combustion cylinder 6 and the swirling air adjustment plate 30 is improved. Further, the bent portions 30a, 30
The strength is improved by the presence of b, and the swirling air adjustment plate 30 is less likely to be thermally deformed even when the temperature of the combustion cylinder 6 becomes high.

Instead of providing the swirling air adjusting plate 30 as described above, as shown in FIGS. 5A to 5C, the first combustion cylinder 6a is moved downward with the enlarged flange 41 and the enlarged cylinder. Part 4
2 and the front face of the enlarged diameter flange portion 41 is the second combustion cylinder 6b.
Of the second air flow swirler 25 is overlapped with the rear surface of the second flange portion, and the inner surface of the enlarged diameter cylinder portion 42 is connected so as to fit with the outer surface of the second combustion cylinder 6b. The air hole 4 of the enlarged flange portion according to the position of the outlet 27
3 may be formed by punching, and air may be supplied from the blower 1 to the outlet 27 via the enlarged-diameter flange air hole 43. This corresponds to an embodiment in which the swirling air adjusting plate 30 is integrated with the first combustion cylinder 6a. Also in this embodiment, the second airflow swirler 25
Is manufactured by a simple method, but the amount of swirling air by the second airflow swirler 25 can be determined by the punched holes 43 with high processing accuracy. Therefore, the processing variation for each burner is reduced, and the second airflow swirl is reduced. The flame holding state and the combustion state in the vessel 25 are stabilized. As a result, the occurrence of soot is suppressed.

[0031]

In the burner according to the first and second aspects of the present invention, an oxygen-deficient region is unlikely to occur in a portion where the soot has been generated conventionally, and the generation of soot is suppressed. Further, the shortening of the flame is promoted, and the size of the combustion chamber up to the heat exchanger in front of the combustion cylinder can be reduced. In the burner according to the third, fourth, and fifth aspects of the present invention, although it can be manufactured by a simple method, variation in processing is reduced, and stable combustion is ensured. As a result, generation of soot is suppressed. In the burner according to the sixth aspect of the present invention, in addition to the effect of the burner according to the fifth aspect, the sealing performance of the joint surface between the combustion cylinder and the swirling air adjusting plate is improved. Further, the strength is improved by the presence of the bent portion, and the swirling air adjustment plate is less likely to be thermally deformed even when the temperature of the combustion cylinder becomes high. As described above, in the variable combustion amount burner according to the present invention, effects such as stabilization of the combustion state, shortening of the flame, suppression of soot generation, and improvement of the strength can be obtained with a simple configuration.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part of a burner according to an embodiment of the present invention.

FIG. 2 is a partial perspective view of the burner.

FIG. 3 is a partial perspective view of the burner.

FIG. 4 is an explanatory diagram illustrating a state of air flowing in from an outlet.

FIG. 5 is a partially cutaway elevation view of a burner according to another embodiment of the present invention.

FIG. 6 is a bottom view of the burner of the present invention.

FIG. 7 is a partially cutaway elevation view of a conventional burner.

FIG. 8 is a partially broken elevation view of a main part of the conventional burner.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Blower 2 Air case 3 Nozzle accommodating cylinder 6 Combustion cylinder 7 Nozzle 8 Spark plug 10, 11, 12a, 12b Air hole 13 First flange part 14 First combustion cylinder main body 15 First airflow swirler 16 Swirl vane 23 Second flange Part 24 second combustion cylinder main body 25 second air flow swirler 26 curved part 27 outlet 28 pore

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hideo Ueda 93 Edocho, Chuo-ku, Kobe-shi, Hyogo Pref.

Claims (6)

[Claims] An open-ended nozzle housing cylinder having a built-in fuel injection nozzle, an open-ended combustion tube connected to an open end of the nozzle housing tube, and supplied with air from a blower for combustion In the burner, the combustion cylinder comprises a first combustion cylinder connected to the open end of the nozzle storage cylinder and a large-diameter second combustion cylinder further connected to the first combustion cylinder,
The first combustion cylinder has a first flange portion connected to the open end of the nozzle housing cylinder and a first combustion cylinder main body connected to the first flange portion, and the first flange portion has a first airflow swirler. The second combustion cylinder has a second flange portion connected to the first combustion cylinder body and a second combustion cylinder body connected to the second flange portion, and the second flange portion has a second airflow swirler. The second airflow swirler has a plurality of outlets arranged in a circumferential shape, and a blowing direction from the outlet is directed more inward than a tangential direction of a trajectory in which the outlets are arranged. A burner characterized by that: 2. An open-end nozzle housing cylinder having a built-in fuel injection nozzle, an open-end combustion tube connected to the open end of the nozzle housing tube, and supplied with air from a blower for combustion. In the burner, the combustion cylinder comprises a first combustion cylinder connected to the open end of the nozzle storage cylinder and a large-diameter second combustion cylinder further connected to the first combustion cylinder,
The first combustion cylinder has a first flange portion connected to the open end of the nozzle housing cylinder and a first combustion cylinder main body connected to the first flange portion, and the first flange portion has a first airflow swirler. The second combustion cylinder has a second flange portion connected to the first combustion cylinder body and a second combustion cylinder body connected to the second flange portion, and the second flange portion has a second airflow swirler. The second airflow swirler has a plurality of outlets arranged in a circumferential shape, and the outlet is provided at a position closer to the inner periphery than the center of the inner periphery of the second flange portion. Features burner. 3. An open-end nozzle housing cylinder having a built-in fuel injection nozzle, and an open-end combustion tube connected to the open end of the nozzle housing tube. In the burner, the combustion cylinder comprises a first combustion cylinder connected to the open end of the nozzle storage cylinder and a large-diameter second combustion cylinder further connected to the first combustion cylinder,
The first combustion cylinder has a first flange portion connected to the open end of the nozzle housing cylinder and a first combustion cylinder main body connected to the first flange portion, and the first flange portion has a first airflow swirler. The second combustion cylinder has a second flange portion connected to the first combustion cylinder body and a second combustion cylinder body connected to the second flange portion, and the second flange portion has a second airflow swirler. The second airflow swirler has a plurality of outlets, the outlets are formed in a shape that blows air supplied from the blower to the second combustion cylinder in a circumferential direction in the second flange portion, The first combustion cylinder has a large-diameter flange portion and a large-diameter cylinder portion at the front, an inner surface of the large-diameter cylinder portion is fitted with an outer surface of the second combustion cylinder, and a front surface of the large-diameter flange portion is the second. It is connected so as to overlap the rear surface of the second flange portion of the combustion cylinder, and the second airflow A burner, wherein an enlarged-diameter flange portion air hole is formed in accordance with the position of the outlet of the circulator, and air is supplied from the blower to the outlet via the enlarged-diameter flange portion air hole. . 4. An open-end nozzle housing cylinder having a built-in fuel injection nozzle, an open-end combustion tube connected to the open end of the nozzle housing tube, and supplied with air from a blower to perform combustion. In the burner, the combustion cylinder comprises a first combustion cylinder connected to the open end of the nozzle storage cylinder and a large-diameter second combustion cylinder further connected to the first combustion cylinder,
The first combustion cylinder has a first flange portion connected to the open end of the nozzle housing cylinder and a first combustion cylinder main body connected to the first flange portion, and the first flange portion has a first airflow swirler. The second combustion cylinder has a second flange portion connected to the first combustion cylinder body and a second combustion cylinder body connected to the second flange portion, and the second flange portion has a second airflow swirler. Provided, the second airflow swirler has a plurality of outlets, the outlet is formed in a shape that blows air supplied from the blower to the second combustion cylinder in a circumferential direction in the second flange portion, The burner further comprises swirling air adjusting means for adjusting the amount of air supplied from the blower to the second airflow swirler. 5. An open-end nozzle housing cylinder having a built-in fuel injection nozzle, an open-end combustion tube connected to the open end of the nozzle housing tube, and receiving air supplied from a blower for combustion. In the burner, the combustion cylinder comprises a first combustion cylinder connected to the open end of the nozzle storage cylinder and a large-diameter second combustion cylinder further connected to the first combustion cylinder,
The first combustion cylinder has a first flange portion connected to the open end of the nozzle housing cylinder and a first combustion cylinder main body connected to the first flange portion, and the first flange portion has a first airflow swirler. The second combustion cylinder has a second flange portion connected to the first combustion cylinder body and a second combustion cylinder body connected to the second flange portion, and the second flange portion has a second airflow swirler. Provided, the second airflow swirler has a plurality of outlets, the outlet is formed in a shape that blows air supplied from the blower to the second combustion cylinder in a circumferential direction in the second flange portion, The combustion cylinder is further connected to an annular swirling air adjusting plate such that a front surface thereof overlaps a rear surface of the second flange portion of the second combustion cylinder, and the swirling air adjusting plate has a second airflow swirler. A swirling air adjusting plate air hole is formed in accordance with the position of the outlet. Are burners, characterized in that air is supplied to the swirling air adjustment plate air hole the air outlet via the said blower. 6. The swirling air adjusting plate has a bent portion at an outer peripheral end and an inner peripheral end, and the inner surface of the bent portion at the outer peripheral end is fitted to the outer surface of the second combustion cylinder. The burner according to claim 5, wherein an inner surface of the peripheral end is fitted with an outer surface of the first combustion cylinder.