JPH0642716A - Combustion device - Google Patents

Abstract

PURPOSE:To reliably protect simply constituted insulator parts for an ignition plug, a flame sensor and the like while enhancing combustion performance and expanding the range of combustion. CONSTITUTION:This device comprises: a burner body; a burner head 13 mounted on the upper part of the burner body and having burner ports 17 on the peripheral wall thereof; a burner ring 18 provided on the outer periphery of the burner head 13 and having a comb-toothlike annular wall 18B opposed to the burner ports 17; an ignition plug 20 for igniting fuel-air mixed gas ejected from the burner ports 17; and an insulator part of the ignition plug 20, which is provided on the outside of the comb-toothlike annular wall 18B. Further, the comb- toothlike annular wall 18B has an insulator protecting part 22 having no slits or having slits shallower than those at other portions, which is formed on a portion opposed to the insulator part of the ignition plug 20.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Conventionally, in this type of combustion apparatus, for example, as disclosed in Japanese Patent Laid-Open No. 3-20505, a cylindrical burner head having a plurality of flame holes in its peripheral wall is provided above the burner body. With mounting, 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 horizontally from the flame hole of this burner head is suppressed by the annular wall of the burner ring. It is intended to prevent the metal combustion cylinders constituting the combustion chamber from being heated to a temperature higher than the heat resistant temperature at the time of strong combustion and to reduce NOx.

By the way, in the conventional device described above,
While the metal combustion cylinder can be prevented from being heated above the heat resistant temperature during strong combustion, the flame is formed small near the flame hole during weak combustion, so burner ring hinders the supply of fresh air to the flame and CO There was a problem in that

Therefore, if the annular wall of the burner ring facing the flame hole is formed in a comb-like shape, fresh air can be supplied even to a small flame formed near the flame hole, and CO at the time of weak combustion.
Can be suppressed and combustion performance can be improved. However, in that case, at the time of strong combustion, the insulator of the spark plug and the frame sensor located outside the annular wall are roasted by the strong combustion flame passing through the vertical slit of the annular wall formed in a comb shape. There was a concern that the temperature of the insulator would rise above the heat resistant temperature.

[0005]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and improves the combustion performance and expands the combustion width while at the same time providing insulators such as spark plugs and flame sensors. The purpose is to ensure protection with a simple configuration.

[0006]

According to the present invention, a burner body, a burner head mounted on an upper portion of the burner body and having a flame hole in a peripheral wall thereof, and a burner head provided on the outer periphery of the burner head, the flame hole of the burner head are provided. And a burner ring having a comb-shaped annular wall in which a number of slits are opened from the upper end toward the root, and a spark plug for igniting the mixture gas ejected from the burner head flame holes. An insulator portion of the spark plug is provided outside the comb-teeth annular wall, and the comb-teeth annular wall has no slit at a portion facing the insulator portion of the ignition plug or has a slit more than other portions. This is a structure in which a shallow insulator protection part is formed.

Further, according to the present invention, the burner body, the burner head mounted on the upper portion of the burner body and having the flame hole in the peripheral wall, and the burner head provided on the outer periphery of the burner head, facing the flame hole of the burner head, and A burner ring having a comb-shaped annular wall in which a number of slits are opened from the upper end toward the root, an ignition plug for igniting a mixture gas ejected from the flame holes of the burner head, and a frame sensor,
The insulator part of the spark plug and the frame sensor is provided outside the comb tooth-shaped annular wall, and the comb tooth-shaped annular wall has no slits or other parts in the part facing the insulator part of the spark plug and the frame sensor. This is a structure in which an insulator protection portion having a slit shallower than the portion is formed.

[0008]

With this configuration, the fire formed in the flame holes becomes small during weak combustion, and air flows into the inside of the comb-teeth annular wall from the slit of the comb-teeth 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 CO is generated, and at the time of strong combustion, the flame formed in the flame hole becomes large and the heat of this flame is transferred. Since the comb-shaped annular wall robs the flame, the flame temperature is lowered and the amount of NOx generated is reduced. In addition, since the insulator protection portion is formed on the comb tooth-shaped annular wall at the portion facing the insulator portion of the ignition plug, the insulator protection portion can receive the flame and direct the flow of the flame upward. The temperature of the insulator portion of the spark plug does not rise above the heat resistant temperature, and heat damage to the spark plug is reliably prevented with a simple configuration.

In the combustion device of the second aspect, the insulator protection portion formed on the comb-shaped annular wall can receive the flame and direct the flow of the flame upward, and the insulator portion of the ignition plug and the flame sensor can be Since there is no concern that the temperature will rise above the heat resistant temperature, heat damage to the spark plug and flame sensor will be prevented with a simple configuration.

[0010]

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

Reference numeral 12 denotes a diaphragm plate arranged in the upper opening of the vaporizing cylinder 1, and 13 denotes a burner head fitted and attached to the upper end opening of the vaporizing cylinder 1 on the diaphragm plate 12. The burner head 13 is provided. It is formed in the shape of a bottom cylinder, has a large number of through holes 14, 14 in the bottom wall thereof, has a canopy 15 at the upper portion, and has a wire mesh 16 inside and outside the peripheral wall (the inner wire mesh is not shown). A large number of circular flame holes 17, 17
Is provided.

Reference numeral 18 denotes a burner ring made of heat-resistant steel arranged on the outer periphery of the burner head 13. The burner ring 18 has a horizontal portion 18A abutting on the upper surface of the vaporizing cylinder 1 and fixed by screws. The comb-teeth annular wall 18B provided integrally with the outer peripheral edge of the horizontal portion 18A is provided to the flame hole 1
It faces 7 and 17. The comb-shaped annular wall 1
8B, as shown in FIG. 4, has a large number of vertical slits 19, 19
The slits 19 are formed in a comb-teeth shape by arranging the slits at substantially equal intervals in a substantially vertical direction, and the slits 19 are formed in
As shown in FIG. 4, the upper end portion is provided so as to reach a position (root portion) lower than the flame hole 17.

Reference numeral 20 is a spark plug for igniting a mixture of vaporized gas and air ejected from the flame hole 17, and 21 is a flame sensor for detecting the flame F formed in the flame hole 17 and for detecting the oxygen concentration. The insulator portion 20A of the spark 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 face the outside of the comb-shaped annular wall 18B.

Further, as shown in FIG. 1, the comb-shaped annular wall 18B of the burner ring 18 has a slit 19 at a portion facing the insulator portion 20A of the ignition plug 20 and the insulator portion 21A of the frame sensor 21. The non-comb-tooth-shaped portion 22 (insulator protection portion) is formed in a predetermined width.

Reference numeral 23 denotes an insulator portion 20A of the spark plug 20.
And the insulator portion 21A of the frame sensor 21 are fixed metal fittings for fixing and holding them to the upper flange portion 5A of the burner case 5, and the fixing metal fitting 23 is the both metal insulator portions 20A, 21A.
The tip of one tightening screw 24 inserted in the intermediate position of A is screwed to the upper flange portion 5A of the burner case 5 so as to be fastened to the upper flange portion 5A. Further, both the discharge portion of the ignition plug 20 and the detection portion of the frame sensor 21 are extended between the comb-teeth annular wall 18B of the burner ring 18 and the flame hole 17 of the burner head 13. Reference numeral 25 in FIG. 2 denotes a metal combustion cylinder. In the above-described configuration, when the vaporization cylinder 1 rises above the vaporizable temperature of the liquid fuel due to the energization of the sheath heater 2, the blower 4 and the fuel pump 9 are operated, the liquid fuel from the fuel nozzle 7 and the primary air passage Primary air for combustion is supplied into the vaporization cylinder 1 from 3.
Here, the fuel supplied into the vaporization cylinder 1 is vaporized by contacting the vaporization surface, and the mixture of the vaporized gas and the primary air for combustion passes through the passage of the throttle plate 12 and the through holes 14, 14. It passes through and enters the burner head 13, and is ejected from each flame hole 17, 17. The jetted air-fuel mixture is ignited by the spark discharge generated from the discharge portion of the spark plug 20, forms a flame F, and starts combustion.

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

After that, the heat of the flame F is recovered by the vaporizing cylinder 1, and when the temperature of the vaporizing portion of the vaporizing cylinder 1 is maintained at the vaporizable temperature of the fuel by the recovered heat, the sheath heater 2 is energized. Is stopped and combustion continues.

According to this embodiment, a plurality of flame holes 1 are formed on the peripheral wall.
A cylindrical burner head 13 having Nos. 7 and 17 is attached to the upper portion of the vaporizing cylinder 1, and a burner ring 18 having a comb-shaped annular wall 18B facing the flame holes 17 and 17 is provided on the outer circumference of the burner head 13. Since it is positioned and provided on the upper part of the vaporization cylinder 1, when the combustion device burns with a weak combustion of about 500 Kcal / h, the flame F formed in the flame hole 17 is shown in FIG. Becomes smaller and enters the inside of the comb-shaped annular wall 18B, and the secondary air for combustion that has risen in the space between the burner case 5 and the vaporization cylinder 1 becomes the vertical slits 19 and 19 of the comb-shaped annular wall 18B. Through and flows into the inside of the comb-shaped annular wall 18B. Therefore, even with a small flame F due to weak combustion, the secondary air for combustion can be efficiently supplied, the combustion reaction is significantly promoted, and good weak combustion with a small amount of CO generated can be performed. At this time, the flow of the secondary air for combustion supplied to the flame F through the vertical slits 19, 19 is a laminar flow, so that the turbulence of the flame is extremely small and the combustion state is stable.

In addition, the combustion device is approximately 2500 Kcal / h.
When 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 hits the wall between the vertical slits 19 and 19 of the comb-shaped annular wall 18B so as to face upward, and The combustion cylinder 24 is protected. A part of the remaining flame F extends in the horizontal direction and faces upward due to the resistance when passing through the vertical slit 19. Here, the comb-teeth annular wall 18B is cooled by the secondary air for combustion flowing inside and outside, and effectively removes the heat of the flame F that comes into contact with the cooled comb-teeth annular wall 18B. The temperature decreases and the amount of NOx generated decreases.

Here, the comb-shaped annular wall 18B at a portion facing the insulator portion 20A of the spark plug 20 and the insulator portion 21A of the frame sensor 21 is formed with a non-comb tooth portion 22 having no slit 19 over a predetermined width. Therefore, the combless tooth portion 22 can receive the hot air of the flame F and direct the flow of the flame F upward. Therefore, there is no concern that the temperatures of the two insulators 20A and 21A will rise above the heat resistant temperature, and thermal damage to the spark plug 20 and the frame sensor 21 can be prevented.

Further, it is not necessary to provide a special component for protecting both the insulator portions 20A and 21A from overheating due to the flame F, the structure can be simplified, and the number of components and the number of assembling steps can be prevented from increasing.

In the above embodiment, the comb-shaped annular wall 1 is used.
The combless tooth portion 22 without the slit 19 is formed in the portion of the 8B facing the both insulator portions 20A and 21A.
A shallow slit that does not affect the thermal influence of the flame F on 0A, 21A may be opened at the upper end of the portion facing both insulator portions 20A, 21A, and that portion may be used as the insulator protection portion. Further, in the above-mentioned embodiment, the vaporization type combustion device for vaporizing and burning the liquid fuel has been described, but it may be a gas combustion device.

[0023]

As described above, according to the present invention, the burner body, the burner head mounted on the upper portion of the burner body and having the flame holes in the peripheral wall, and the burner head provided on the outer periphery of the burner head are provided. A burner ring having a comb-shaped annular wall facing the hole and an ignition plug for igniting a mixture gas ejected from the flame hole are provided to accelerate the combustion reaction during weak combustion and decrease the flame temperature during strong combustion. In the case where the combustion width is expanded, the temperature of the insulator portion of the spark plug rising above the heat resistant temperature by the heat of the flame can be reliably suppressed by the insulator protection portion formed in the comb-shaped annular wall, Moreover, heat damage to the ignition plug, such as the need for no special parts, can be efficiently and inexpensively prevented with a simple configuration.

In the combustion device of the second aspect, thermal damage to both the spark plug and the flame sensor can be prevented efficiently and inexpensively with a simple structure.

[Brief description of drawings]

FIG. 1 is a perspective view of a main part of a liquid fuel combustion apparatus according to an embodiment of the present invention.

FIG. 2 is likewise an overall configuration diagram.

FIG. 3 is also an enlarged cross-sectional view of an essential part.

FIG. 4 is a half sectional view of a burner ring.

FIG. 5 is an explanatory diagram illustrating a state during weak 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-shaped annular wall 20 Spark plug 20A Spark plug insulator 21 Frame sensor 21A Frame sensor insulator 22 Combless insulator (insulator) Protective part) F flame

Claims (2)

[Claims] 1. 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 thereof, and provided on an outer periphery of the burner head, facing the flame hole of the burner head and having an upper end portion. From the burner ring having a comb-shaped annular wall with a large number of slits from the root to
An ignition plug for igniting a mixture gas ejected from a burner head flame hole is provided, and an insulator portion of the ignition plug is provided outside the comb-teeth annular wall, and the comb-teeth annular wall has an insulator for the ignition plug. A combustion device, characterized in that an insulator protection portion having no slit or having a slit shallower than other portions is formed in a portion facing the portion. 2. 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 a burner head provided on an outer periphery of the burner head, facing the flame hole of the burner head and having an upper end portion. From the burner ring having a comb-shaped annular wall with a large number of slits from the root to
An ignition plug for igniting an air-fuel mixture ejected from a burner head flame hole and a frame sensor are provided, and insulators of the ignition plug and the frame sensor are provided outside the comb-shaped annular wall, and the comb-shaped annular wall is provided. In the combustion device, an insulator protection portion having no slit or a slit shallower than other portions is formed in a portion of the spark plug and the flame sensor facing the insulator portion.