JPS6345003B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a combustion device used in oil fan heaters and the like.

Conventional structure and problems thereof Conventionally, in this type of combustion apparatus, as shown in FIG.
In order to prevent the outer shell portions of the fireworks and the like from being heated to high temperatures, an annular wall 4 was provided opposite the flame hole 2 to reduce the spread of the flame F. However, with this configuration,
Even if secondary air 5 (arrow in the figure) is introduced in order to widen the combustion range, it passes through the outside of the annular wall 4, flows in from the upper end of the annular wall 4, and comes into contact with the flame F, so that the combustion reaction is almost impossible. The effect of improving the combustion characteristics was not so great. In addition, since the annular wall 4 causes the primary air (flowing in the direction in which the flame F is formed) and the secondary air 5 to flow in parallel, mixing is poor, and the effect of improving the combustion characteristics is similar to that described above. was difficult to obtain, and the flammability range was narrow. For this reason, there has been a problem, particularly in indoor open-type combustion machines such as fan heaters, that even a small imbalance in the air-fuel ratio causes the emission of unburned components such as carbon monoxide that are harmful to the human body.

OBJECTS OF THE INVENTION The present invention was made in view of the above points, and aims to improve combustion characteristics and expand the flammability range.

Structure of the Invention In order to achieve the above object, the present invention provides a small hole for introducing secondary air on the inside of the annular wall facing the flame hole, that is, in the area from the flame hole to the annular wall, so that the flame of the secondary air This is designed to speed up contact with the liquid and improve mixing. In addition, secondary air flows both inside and outside the annular wall to cool the ground plate and improve durability.

DESCRIPTION OF EMBODIMENTS One embodiment will be described below with reference to FIGS. 2 to 4. In the figure, 6 is a vaporization cylinder with an open top, 7 is a sheathed heater embedded in this vaporization cylinder, and 8
is a primary air passage that supplies combustion air to the vaporization cylinder 6, and is in communication with the blower 9. A secondary air passage 10 supplies secondary air 11 to the outside of the vaporization cylinder 6 and communicates with a blower 9 similarly to the primary air passage 8. A fuel pipe 12 supplies fuel to the carburetor cylinder 6, and communicates with a fuel tank 14 via a pump 13. A burner case 15 surrounds the outer periphery of the vaporization cylinder 6 and guides the secondary air 11 upward. Reference numeral 16 indicates a guide provided at the upper opening of the vaporizer cylinder 6, and reference numeral 17 indicates the guide member 16 from above the vaporizer cylinder 6.
The burner head is covered with the upper opening of the burner head, and is formed in the shape of a ceiling cylinder, and a plurality of flame holes 19 with wire mesh 18 lined inside are formed in the peripheral wall of the burner head. Reference numeral 20 denotes a grounding plate fitted around the opening of the vaporizer cylinder 6, and an annular wall 20b surrounding the outer periphery of the flame hole 19 is formed on the outer periphery of the horizontal portion 20a. The earth plate 2
A plurality of small holes 21 for introducing secondary air are provided in the horizontal part 20a of the flame hole 19 and the annular wall 20b.
Secondary air 11 is configured to flow into the gap. 22 is an ignition electrode that ignites the mixture of fuel and air ejected from the flame hole 19, and 23 is a flame rod that detects the ignited flame F.

In the above configuration, the fuel supplied from the fuel pipe 12 is vaporized in the vaporization cylinder 6, mixed with the primary air supplied from the primary air passage 8, and
6 through the flame hole 19 in the peripheral wall of the burner head 17
erupts from. And this mixed gas is the ignition electrode 2
It is ignited by the spark discharge from 2, forms a flame F, and starts combustion.

On the other hand, the secondary air 11 supplied from the secondary air passage 10 is guided upward through the outside of the carburetor 6, that is, through the inside of the burner case 15, and a part of it is provided on the horizontal part 20a of the ground plate 20. The secondary air flows into the gap between the flame hole 19 and the annular wall 20b through the secondary air introduction small hole 21. Therefore, the secondary air 11 will flow into a position quite close to the flame hole 19 of the flame F formed in the flame hole 19, and the secondary air 11 will be obtained in the middle of the combustion reaction, promoting the combustion reaction. is,
More complete combustion can be achieved.

In addition, in this embodiment, the flow of the mixed gas (flame F) ejected from the flame hole 19 is horizontal, whereas the secondary air flows in through the secondary air introduction small hole 21. Since the flow of air 11 is vertical, the flame F and the secondary air 11 are mixed very well, and the combustion reaction is carried out even more efficiently. Therefore, the combustion range is greatly expanded, and even if the air-fuel ratio balance between fuel and air changes slightly, complete combustion always occurs and no harmful carbon monoxide or the like is emitted.

In the above embodiment, the ground plate 20 is connected to the vaporizer cylinder 6.
(burner body), but it goes without saying that the same effect can be obtained even if the portion up to the annular wall is integrally molded with the vaporizing tube 6 (burner body). Furthermore, although the above embodiments have been described using a combustion device that uses liquid fuel, the same applies to a combustion device that uses gaseous fuel.

Effects of the Invention As is clear from the above explanation, according to the present invention,
Since secondary air can be introduced into the flame formed by igniting a mixed gas of primary air and fuel during the combustion reaction and in a state where it is easy to mix, the combustion reaction can be carried out more efficiently. , the combustion range can be expanded. Therefore, even if the air-fuel ratio balance changes somewhat, incomplete combustion does not occur, and a safe combustion device can be provided. Furthermore, by flowing secondary air both inside and outside the annular wall, the flame is drawn closer to the inside, and the annular wall is cooled from both sides, making it possible to reduce the temperature considerably and increase the durability of the ground plate. The quality is greatly improved.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a conventional combustion device, FIG. 2 is a sectional view of a combustion device in an embodiment of the present invention,
FIG. 3 is a perspective view of the combustion section, and FIG. 4 is a sectional view of the combustion section. 6... Burner main body (vaporizing cylinder), 15... Burner case, 17... Burner head, 19... Flame hole,
20... Earth plate, 20b... Annular wall, 21...
Small hole for introducing secondary air.

Claims (1)

[Claims] 1. A cylindrical burner head having a flame hole in its peripheral wall, a grounding plate having an annular wall located on the outer periphery of the burner body and facing the flame hole, and a burner case surrounding the outer periphery of the burner body; A blower for blowing air is provided between the burner body and the burner case, and a gap is provided between the upper part of the burner case and the ground plate for flowing secondary air, and a plurality of secondary air blowers are provided at the base of the ground plate. A combustion device having a structure in which a small hole for introducing secondary air is provided to allow secondary air from the blower to flow inside and outside the annular wall.