JPS63302207A - Combustion apparatus - Google Patents

Abstract

PURPOSE:To widely maintain the width of combustion and improve durability by arranging a flame hole ring adhering to the lower part of the inner wall of a burner body and forming the upper end thereof overlapped with a part of the lower part of flame holes. CONSTITUTION:Since flame shaped in flame holes 17 shows that the velocity of the mixed gas of the lower part of the flame holes is slower than that of the upper part thereof by the existence of a flame hole ring 24, the lower part of the flame being small in size adheres to porous bodys 18 and is firmly stable, while the upper part of the flame interferes with the upper part thereof, the flame is maintained, projected outward and is stable free of lifting. The flame adheres to porous body 16 during weak combustion, but the flame of the upper part of the flame holes accelerates the velocity of the mixed gas by the presence of the flame hole ring 24, temperature interference with the upper part thereof is lessened because of small flame quantity of the lower part of the flame holes with the flame being formed in the area away from the porous bodys and the temperature rise of the porous bodys 18 is considerably lessened.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a combustor used in a heater or the like.

Conventional technology In general, this type of combustor vaporizes liquid fuel supplied from a nozzle in a vaporization cylinder, mixes it with combustion air supplied from an air supply pipe, and vaporizes a premixed gas of this air and fuel. The flame was ejected from a vertically elongated flame hole 2 provided in the circumferential wall of a burner head 1 as shown in FIG. 4 at the top of the cylinder for combustion.

Problems to be Solved by the Invention However, when the burner port 2 of the combustor performs combustion with a small amount of combustion, flames are generated in the gap between the burner port 2 and the porous pipe 3, such as a wire mesh, provided on the outer periphery of the burner head. Since the porous tube 3 is formed and continues to burn, the porous tube 3 becomes red hot and its durability is uncertain. For this purpose, expensive high-grade heat-resistant materials are used, but from a long-term perspective, it cannot be said to be perfect.

Therefore, in order to lower the temperature of the porous tube 3, we considered increasing the flow rate of the mixed gas ejected from the flame port 2 to form a flame outside the porous tube a to lower the temperature. However, when this method is used, a slight disturbance in the air-fuel ratio leads to lifting combustion, and the flame current of the flame rond rapidly decreases, resulting in a very narrow combustion range in which combustion stops. This is because if the flame current value that stops combustion is set lower than before, the combustion width can be kept wide, but because the flame opening is made smaller, the flame stability is poor, so if the flame current setting value is lowered. This method could not be used in practice because it caused combustion noise due to lifting combustion, carbon monoxide due to incomplete combustion, and odor.

The present invention has been made in view of the above points, and aims to provide a highly reliable combustor that maintains a wide combustion width while improving durability.

Means for Solving the Problems In order to achieve the above object, the present invention has a structure in which a flame hole ring is disposed in close contact with the lower part of the inner wall of the burner body, and its upper end overlaps a part of the lower end of the flame hole. .

Function The present invention has the above-described configuration, so that the flow velocity of the mixed gas ejected from the flame nozzle is faster at the upper part of the flame nozzle and slower at the lower part of the flame nozzle. Therefore, the amount of flame at the bottom of the flame nozzle is reduced, resulting in good flame holding properties, and as a result, the lifting of the upper flame is prevented by the lower flame, and since the amount of lower flame is small, heat is transferred to the top of the nozzle. The temperature increase in the porous tube is also significantly reduced.

Embodiment Below, one embodiment of the present invention will be described with reference to FIGS. 1 and 2. Reference numeral 11 is a bottomed cylindrical vaporizing/mixing cylinder, and a fuel supply nozzle 12 is installed at an eccentric position on a part of its peripheral wall. An air supply pipe 13 for supplying combustion air is exposed. 14 is a heater embedded in the vaporization/mixing cylinder 11; 15 is the vaporization/mixing cylinder 11;
The burner body covers the upper opening of the vaporizing and mixing cylinder 1.
It has a narrow part 16 at the bottom that protrudes into the inside. Reference numeral 17 denotes a flame hole formed in the peripheral wall of the burner body 15, and as is clear from the drawing, a flame hole ring 24 is disposed in close contact with the lower part of the inner wall of the burner body, and its upper end is a part of the lower end of the flame hole 17. There is an over ramp. In this embodiment, it is inclined in a direction intersecting the swirling flow of the premixed gas in the vaporizing/mixing cylinder 11 caused by the air jet from the air supply pipe 13. Reference numeral 18 denotes a porous tube such as a wire mesh attached to the inside and outside of the peripheral wall of the burner body 15, and is fixed to the burner body 15 by spot welding 19 between each flame hole.

20 is a pressure equalizing plate provided inside the burner body 15, 21 is a double burner cap covered over the upper opening of the burner body 15, 22 is a nut for fixing the double burner cap 21, and 23 is a flame hole 17. A frame rod 24 provided opposite to one of the two is a burner case surrounding the vaporizing/mixing cylinder 11. The porous cylinder 18 installed on the outer periphery of the side wall of the burner body 15 has its lower end connected to the flange 11m of the vaporizing cylinder 11, and its upper end connected to the bent edge 21 of the burner cap 21.
1, and is supported in close contact with the burner body 15.

In the above configuration, the vaporizing/mixing cylinder 11 is
The fuel injected inside is vaporized in the vaporization/mixing cylinder 11 which is heated to a high temperature by the sheathed heater 14, and is premixed with combustion air sent into the vaporization/mixing cylinder 11 by a blower or the like.

This premixed vaporized gas flows inside the burner body 15 through the narrow part 16 of the burner body 15 and the small hole 20a of the pressure equalizing plate 20 while swirling in the vaporization/mixing cylinder 11, and is ejected from the flame hole in the outer peripheral wall. . When the flame is ignited using an appropriate ignition means, combustion starts and a flame is formed that is in close contact with the porous cylinder 18 around the flame hole 17.

Here, as shown in FIG. 3, the flame formed in the flame hole 17 is small and tightly adheres to the porous body 18 because the flow rate of the mixed gas in the lower part of the flame hole is slower than in the upper part due to the existence of the flame hole ring 24. The part of the upper flame that becomes a very strong and stable flame interferes with the lower flame and protrudes outward while being flame-holding, resulting in a stable flame without lifting. This situation is the same during weak combustion, and the flame is in close contact with the porous body 16, but the flame above the flame hole is faster than the conventional flame because the mixed gas flow velocity is accelerated by the flame hole ring 24. Compared to this, the flame is formed further away from the porous body 18 and the amount of flame at the lower part of the flame mouth is small, so there is less temperature interference with the upper part, and the temperature rise in the porous body 18 is significantly smaller.

Furthermore, in this embodiment, the upper part of each flame hole 17 is set to overlap with the lower part of the flame hole 17 in the pond, so the flames interfere with each other, resulting in even higher and more stable flame retention. . Therefore, even if the ratio of fuel and air changes slightly, lift combustion will no longer occur.
Problems such as flapping noise and carbon monoxide generation due to lift combustion are eliminated, and the combustion range becomes stable even where lift combustion was conventionally performed, resulting in a wider combustion range. Also, as mentioned above, flame hole 1
Since the flame formed at 7 is highly stable and stable, the detection output of the flame rod 23 is naturally stable, and there is little variation in detection when there is a lack of oxygen, air shortage, or excess air, for example. An accurate sake cup. Moreover, since the premixed gas ejected from each flame hole 17 overlaps at the time of ignition, the ignition progresses quickly.

Effects of the Invention As is clear from the description of the embodiments, according to the present invention, the temperature of the porous body can be significantly lowered while maintaining a wide combustion range, and stable combustion performance is guaranteed under long-term use. It has great effects, such as being highly reliable and having a simple configuration, it can be provided at low cost.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of essential parts of a combustor according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of the entire combustor, FIG. FIG. 3 is a cross-sectional view showing a flame formation state. 11... Mixing part, 15... Burner body, 17... Flame hole, 18... Porous cylinder, 24
... Flame hole ring. Name of agent: Patent attorney Toshio Nakao and 1 other person/l
--Mixed smell 15---Barb-claw de 4 17---Moxibustion hole 7g ---y/l hole Figure 3 Figure 4

Claims (1)

[Claims] The burner body includes a mixing part that mixes air and fuel, a burner body that burns the mixed gas from the mixing part through a plurality of flame holes provided in the outer peripheral wall of the burner body, and a perforated cylinder arranged on the inner and outer peripheries of the peripheral wall of the burner body. , a combustor comprising a flame hole ring that is in close contact with the lower part of the inner wall of the burner body, the upper end of which overlaps a part of the lower end of the flame hole;