JP2823425B2 - Combustion equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion apparatus such as a petroleum gasification type combustion apparatus mainly used for an oil fan heater.

[0002]

2. Description of the Related Art Conventionally, as disclosed in Japanese Patent Application Laid-Open No. Hei 3-20505, for example, a cylindrical burner head having a plurality of flame holes on a peripheral wall is provided on an upper portion of a burner main body. Attached, a burner ring having an annular wall facing the flame hole is provided on the outer periphery of the burner head, and the spread of the flame formed in the horizontal direction from the flame hole of the burner head is suppressed by the annular wall of the burner ring, At the time of strong combustion, the metal combustion cylinder constituting the combustion chamber is prevented from being heated to a heat-resistant temperature or higher, and NOx is reduced.

By the way, in the above-mentioned conventional apparatus,
At the time of strong combustion, the metal combustion cylinder can be reliably protected, but at the time of weak combustion, since the flame is formed small near the flame hole, the supply of fresh air to the flame is hindered by burner ring,
There has been a problem that CO is easily generated.

Therefore, if the annular wall of the burner ring facing the flame hole is formed in a comb shape, fresh air can be supplied also to a small flame formed near the flame hole, and the CO during the weak combustion can be supplied.
In this case, during the strong combustion, the insulator portion of the ignition plug facing the outside of the annular wall is roasted by the strong combustion flame passing through the comb-shaped vertical slit of the annular wall. Therefore, there was a concern that the temperature of the insulator portion would rise to a temperature higher than the heat-resistant temperature.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to prevent thermal damage to an insulator portion of a spark plug while improving combustion performance.

[0006]

According to the present invention, there is provided a burner main body, a burner head mounted on an upper portion of the burner main body and having a flame hole in a peripheral wall, and provided on an outer periphery of the burner head to face the flame hole. A burner ring having a comb-shaped annular wall, and a spark plug for igniting an air-fuel mixture ejected from a flame hole are provided. An insulator portion of the spark plug is provided outside the comb-shaped annular wall of the burner ring. In this configuration, a heat shield plate is provided between the insulator portion and the comb-shaped annular wall.

Further, in the present invention, a burner case, a burner main body accommodated in the burner case, a burner head mounted on an upper portion of the burner main body and having a flame hole in a peripheral wall, and provided on an outer periphery of the burner head A burner ring having a comb-shaped annular wall opposed to the flame hole, and a spark plug for igniting an air-fuel mixture ejected from the flame hole. The insulator portion of the ignition plug is formed of the comb-shaped annular wall of the burner ring. A heat shield is provided between the insulator portion of the ignition plug and the comb-shaped annular wall, and the heat shield plate and the insulator portion of the ignition plug are held by fixtures attached to the burner case.

Further, according to the present invention, there is provided a burner case, a burner main body housed in the burner case, a burner head mounted on an upper portion of the burner main body and having a flame hole in a peripheral wall, and an outer periphery of the burner head. A burner ring provided with a comb-shaped annular wall facing the flame hole; and a spark plug for igniting an air-fuel mixture ejected from the flame hole, wherein an insulator portion of the ignition plug is provided with a comb-shaped annular wall of the burner ring. The heat shield plate is provided between the insulator portion of the ignition plug and the comb-shaped annular wall, and the heat shield plate and the insulator portion of the ignition plug are held by a fixing bracket attached to the burner case, The heat shield plate is provided with heat conduction suppressing means for suppressing heat conduction to the insulator portion.

[0009]

With this configuration, the flame formed in the flame hole during weak combustion becomes small, and air flows into the comb-shaped annular wall through the slits of the comb-shaped annular wall. The combustion reaction of the flame is promoted by the air that has flowed into the inside of the wall, and good weak combustion with a small amount of generated CO can be performed. At the time of strong combustion, the flame formed in the flame hole increases and the heat of this flame is reduced. Since the comb-shaped annular wall is robbed, the flame temperature decreases, and the amount of generated NOx decreases. In addition, since the heat shield plate is provided between the insulator portion of the ignition plug and the comb-shaped annular wall facing the outside of the comb-shaped annular wall, the heat of the flame passing through the slit of the comb-shaped annular wall is provided. It is possible to suppress the temperature of the insulator portion of the spark plug from rising above the heat-resistant temperature, and to prevent thermal damage to the spark plug.

In the combustion apparatus of the present invention, since the heat shield plate and the insulator portion of the ignition plug are held by the fixing fitting attached to the burner case, a holding component for fixing and holding the heat shield plate and the spark plug is provided. Can be shared.

In the combustion apparatus according to the third aspect of the present invention, since the heat shield plate is provided with the heat conduction suppressing means for suppressing heat conduction to the insulator portion, the temperature of the insulator portion of the ignition plug can be increased while sharing the holding component. The rise can be further suppressed.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In the drawing, reference numeral 1 denotes a bottomed cylindrical vaporizing cylinder having an open top, 2 denotes a sheathed heater buried in the upper part of the vaporizing cylinder 1, and 3 denotes a primary air passage for supplying primary air for combustion into the vaporizing cylinder 1. , This primary air passage 3
Is in communication with the blower 4. Reference numeral 5 denotes a burner case which is provided on the outer periphery of the vaporizing cylinder 1 and accommodates the vaporizing cylinder 1. Reference numeral 6 denotes a secondary air passage which supplies secondary combustion air to the outside of the vaporizing cylinder 1 via the burner case 5. The secondary air passage 6 communicates with the blower 4 like the primary air passage 3. Reference numeral 7 denotes a fuel nozzle for supplying liquid fuel (kerosene) into the vaporizing cylinder 1. The fuel nozzle 7 communicates with a fuel tank 10 via a fuel supply pipe 8 and a fuel pump 9 such as an electromagnetic pump. The fuel tank 10 is provided with a detachable cartridge tank 11.

Reference numeral 12 denotes an aperture plate disposed at the upper opening of the vaporizing cylinder 1, reference numeral 13 denotes a burner head fitted and mounted on the upper opening of the vaporizing cylinder 1 above the aperture plate 12, and the burner head 13 is provided. The bottom wall has a large number of through holes 14, 14 on the bottom wall, a canopy 15 on the top, and inner and outer wire meshes 16 on the peripheral wall (the inner wire mesh is shown in the drawing). A large number of circular flame holes 17, 17
Is provided.

Reference numeral 18 denotes a heat-resistant steel burner ring arranged on the outer periphery of the burner head 13. The burner ring 18 abuts the horizontal portion 18A on the upper surface of the vaporizing cylinder 1 and fixes it by screws. The comb-shaped annular wall 18B integrally provided on the outer peripheral edge of the horizontal portion 18A is raised up.
7 and 17. Further, the comb-shaped annular wall 1
8B has a number of vertical slits 19, 19 as shown in FIG.
Are provided in a substantially vertical direction at substantially equal intervals, thereby forming a comb-like shape.
As shown in FIG. 2, the upper portion is provided from a position lower than the flame hole 17.

Reference numeral 20 denotes an ignition plug for igniting a mixture of vaporized gas and air ejected from the flame hole 17, and reference numeral 21 denotes a flame sensor which detects the flame F formed in the flame hole 17 and detects the oxygen concentration. The insulator portion 20A of the ignition plug 20 and the insulator portion 21A of the frame sensor 21 are attached to the upper flange portion 5A of the burner case 5 so as to be opposed to the outside of the comb-shaped annular wall 18B.

Reference numeral 22 denotes an insulator portion 20A of the ignition plug 20.
And the insulator 21A of the frame sensor 21 are fixedly held to the upper flange 5A of the burner case 5, and the fixture 22 is provided with the insulators 20A and 21A.
Is screwed into the upper flange 5A of the burner case 5 so as to be fastened to the upper flange 5A. In addition, the discharge unit 20B of the spark plug 20 and the detection unit 21 of the frame sensor 21
Both of B extend between the comb-shaped annular wall 18B of the burner ring 18 and the flame hole 17 of the burner head 13.

Reference numeral 24 denotes both insulator portions 20A, insulator portions 21A
1 is a heat-insulating plate made of a heat-resistant steel plate and provided between the comb-shaped annular wall 18B of the burner ring 18.
As shown in FIG. 4, the upper edge is formed higher than both the insulator portions 20A and 21A, and as shown in FIG. 4, a pair of insertion holes 25 and 2 through which the insulator portions 20A and 21A are inserted are formed at the lower portion.
5 and a fixing plate 27 having a small hole 26 through which the tightening screw 23 is inserted. The fixing plate 27 is integrally formed. The fixing plate 27 is sandwiched between the fixing bracket 22 and the upper flange 5A of the burner case 5. As a result, the heat shield plate 24 is
A is mounted on A. At the lower part of the heat shield plate 24, there is provided a horizontally elongated slit 28 for suppressing the heat of the heat shield plate 24 from being transmitted to the insulator portions 20A and 21A via the fixed plate portion 27. Reference numeral 29 in FIG. 2 denotes a metal combustion cylinder.

In the above-described configuration, when the vaporizing cylinder 1 rises to a temperature equal to or higher than the vaporizable temperature of the liquid fuel by energizing the sheath heater 2, the blower 4 and the fuel pump 9 operate, and the liquid fuel is discharged from the fuel nozzle 7. Primary air for combustion is supplied from the primary air passage 3 into the carburetor 1. Here, the fuel supplied into the vaporization cylinder 1 contacts the vaporization surface and is vaporized,
The mixture of the vaporized gas and the primary air for combustion is supplied to the throttle plate 1
2 and the burner head 1 through the through holes 14
3 and squirts from each of the flame holes 17. The jetted air-fuel mixture is ignited by a spark discharge generated from the discharge portion 20B of the ignition plug 20, forms a flame F, and starts combustion.

On the other hand, the combustion secondary air supplied into the burner case 5 through the secondary air passage 6 is supplied to the burner case 5.
Rises in the annular space between the peripheral wall and the vaporizing cylinder 1, flows near the outer periphery of the burner ring 18, and is supplied with the flame F to promote secondary combustion.

Thereafter, when the heat of the flame F is recovered by the vaporizing cylinder 1 and the temperature of the vaporizing portion of the vaporizing cylinder 1 is maintained at a temperature at which the fuel can be vaporized by the recovered heat, power is supplied to the sheath heater 2. Is stopped, but combustion continues.

According to this embodiment, a plurality of flame holes 1 are formed on the peripheral wall.
A cylindrical burner head 13 having the burners 7 and 17 is mounted on the upper portion of the vaporizing cylinder 1, and a burner ring 18 having a comb-shaped annular wall 18 </ b> B facing the flame holes 17 and 17 is provided on the outer periphery of the burner head 13. Since it is positioned and provided above the vaporizing cylinder 1, when the combustion apparatus is burning at a low combustion rate of about 700 Kcal / h, as shown in FIG. Is reduced and enters the inside of the comb-shaped annular wall 18B, and the secondary air for combustion, which has risen in the space between the burner case 5 and the vaporizing cylinder 1, is formed by the longitudinal slits 19, 19 of the comb-shaped annular wall 18B. And flows into the inside of the comb-shaped annular wall 18B. Therefore, even if the flame F is small due to weak combustion, the secondary air for combustion can be efficiently supplied, the combustion reaction is greatly promoted, and favorable weak combustion with little CO generation can be performed. At this time, since the flow of the secondary air for combustion supplied to the flame F through the vertical slits 19, 19 is laminar, the turbulence of the flame is extremely small and the combustion state is stabilized.

Further, the combustion device is about 4000 Kcal / h
In the case of burning with strong combustion of as shown in FIG.
The flame F formed in the flame hole 17 becomes large, and a part of the large flame F is directed upward at a tip portion thereof by hitting a wall between the vertical slits 19 of the comb-like annular wall 18B. The combustion tube 29 is protected. A part of the remaining flame F extends in the horizontal direction, and faces upward due to resistance when passing through the vertical slit 19. Here, the comb-shaped annular wall 18B is cooled by the secondary air for combustion flowing inside and outside, and effectively removes the heat of the flame F coming into contact with the cooled comb-shaped annular wall 18B. The temperature decreases, and the amount of generated NOx decreases.

Here, the insulator portion 20A of the spark plug 20 and the insulator portion 21A of the frame sensor 21 and the burner ring 1
The upper edge of each of the two insulator portions 2B is located between the two comb-shaped annular walls 18B.
Heat shield plate 2 formed higher than 0A and 21A and made of heat-resistant steel plate
4, the heat of the flame F passing through the vertical slit 19 of the comb-shaped annular wall 18B can be received by the heat shield plate 24, and the temperature of the insulator portions 20A and 21A rises to the heat-resistant temperature or higher. It is possible to prevent the spark plug 20 and the frame sensor 21 from being thermally damaged.

The heat shield 24, the insulator 20 A of the spark plug 20, and the insulator 21 A of the frame sensor 21 are fixed by a fixing bracket 22 attached to the upper flange 5 A of the burner case 5 with a tightening screw 23. Since it is held, it is possible to share a holding component for fixing and holding the heat shield plate 24, the spark plug 20 and the frame sensor 21.
It is possible to reduce the number of parts and the number of assembly work steps.

Further, below the heat shield plate 24,
The heat of the heat shield plate 24 is transferred via the fixed plate portion 27 to the two insulator portions 2.
Horizontal slit 28 that suppresses transmission to 0A and 21A
The insulators 20A and 2A of the spark plug 20 and the frame sensor 21 are used while sharing the holding parts.
The temperature rise of 1A can be further suppressed.

In the above-described embodiment, a vaporization type combustion apparatus for vaporizing and burning liquid fuel has been described. However, a gas combustion apparatus may be used. The heat shield plate 24 and the fixture 2
2 may be an integrally molded product.

[0027]

As described above, the present invention provides a burner main body, a burner head mounted on the upper part of the burner main body and having a flame hole in a peripheral wall, and provided on the outer periphery of the burner head to face the flame hole. A burner ring having a comb-shaped annular wall and a spark plug for igniting an air-fuel mixture ejected from a flame hole, to promote a combustion reaction during weak combustion and to reduce a flame temperature during strong combustion. In addition, it is possible to prevent the temperature of the insulator portion of the ignition plug from rising above the heat-resistant temperature due to the heat of the flame passing through the slit of the comb-like annular wall by the heat shield plate, and it is possible to reliably prevent the heat damage of the ignition plug.

In the combustion apparatus according to the second aspect, since the heat shield plate and the insulator portion of the spark plug are held by the fixing bracket attached to the burner case, a holding component for holding the heat shield plate and the spark plug fixedly. Can be shared, the number of parts can be reduced, and the number of assembling work steps can be reduced.

According to the third aspect of the present invention, since the heat shielding plate is provided with the heat conduction suppressing means for suppressing the heat conduction to the insulator portion, the temperature of the insulator portion of the ignition plug can be increased while sharing the holding parts. The rise can be further suppressed.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main part of a liquid fuel combustion device according to an embodiment of the present invention.

FIG. 2 is an overall configuration diagram.

FIG. 3 is an enlarged perspective view of a main part of the same.

FIG. 4 is a perspective view of a heat shield plate.

FIG. 5 is a half sectional view of a burner ring.

FIG. 6 is an explanatory diagram illustrating a combustion state during weak combustion.

FIG. 7 is an explanatory diagram illustrating a combustion state during strong combustion.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vaporization cylinder (burner main body) 5 Burner case 13 Burner head 17 Flame hole 18 Burner ring 18B Comb-like annular wall 20 Ignition plug 20A Insulator part of ignition plug 22 Fixture 24 Heat shield plate 28 Horizontal slit 28 (Heat conduction suppressing means ) F Flame

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Noboru Takahashi 2-18-18 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Yoichi Uchida 2--18-3 Keihanhondori, Moriguchi-shi, Osaka (56) References JP-A-5-223218 (JP, A) JP-A-4-278107 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) F23D 11 / 40 F23D 11/10

Claims (3)

(57) [Claims] 1. A burner main body, a burner head mounted on an upper part of the burner main body and having a flame hole in a peripheral wall, and a burner provided on an outer periphery of the burner head and having a comb-shaped annular wall facing the flame hole. A ring, and an ignition plug for igniting the air-fuel mixture ejected from the flame hole. An insulator portion of the ignition plug is provided outside the comb-shaped annular wall of the burner ring, and the insulator portion of the ignition plug and the comb-shaped annular wall are provided. A heat shield plate provided between the combustion device and the combustion device. 2. A burner case, a burner body accommodated in the burner case, a burner head mounted on an upper portion of the burner body and having a flame hole in a peripheral wall, and a flame hole provided on an outer periphery of the burner head. A burner ring having a comb-shaped annular wall opposed to the ignition plug, and an ignition plug for igniting an air-fuel mixture ejected from a flame hole, wherein an insulator portion of the ignition plug is provided outside the comb-shaped annular wall of the burner ring, A heat shield is provided between the insulator portion of the spark plug and the comb-shaped annular wall, and the heat shield plate and the insulator portion of the spark plug are held by fixtures attached to the burner case. apparatus. 3. A burner case, a burner main body accommodated in the burner case, a burner head mounted on an upper portion of the burner main body and having a flame hole in a peripheral wall, and a flame hole provided on an outer periphery of the burner head. A burner ring having a comb-shaped annular wall opposed to the ignition plug, and an ignition plug for igniting an air-fuel mixture ejected from a flame hole, wherein an insulator portion of the ignition plug is provided outside the comb-shaped annular wall of the burner ring, A heat shield plate is provided between the insulator portion of the spark plug and the comb-shaped annular wall, and the heat shield plate and the insulator portion of the spark plug are held by a fixing bracket attached to a burner case, and are attached to the heat shield plate. A combustion device provided with heat conduction suppressing means for suppressing heat conduction to an insulator portion.