JPH02275204A - Burner - Google Patents

Abstract

PURPOSE:To reintroduce unburnt gas into a combustion chamber for combustion and reduce the CO/CO2 sharply during weak combustion by installing an inhibiting cylinder which extends upward from the lower part of a red hot section outside an outside flame cylinder and has a ventilation hole on a wall surface, and installing a plate between outside flame cylinders at a position lower than the red hot section. CONSTITUTION:When a wick 1 is ignited, high temperature combustion gas produced by combustion rises in a combustion chamber 8 and hence produces heat draft so that the air supplied from a space between an outside flame cylinder 7 and an outside cylinder A9 is divided into a stream marked with the arrow (a) supplied to the combustion chamber 8 from an air hole 11 of a vaporizer 16b and a stream marked with the arrow (b) supplied to an air passage 20 by way of a reducing part 15. The fuel vaporized from the wick 1 by the air stream (a) rises as indicated by the arrow (c) in the combustion chamber 8 while a part of the fuel spreads and flows out into an inhibited area 25 as marked with the arrow (d), but unburnt gas is inhibited to spread and flow out into a space between an inhibiting cylinder 24 and an outside cylinder B18, thereby introducing the gas into the combustion chamber 8 from the air passage 20 between the inhibiting cylinder 24 and the outside cylinder B18 by way of a ventilation hole 26 for the inhibiting cylinder 24. The unburnt gas which flows out into the inhibited area is arranged to be introduced into the combustion chamber again, which makes it possible to sharply reduce the amount of CO discharged into the atmosphere.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to a combustion device used for home heating and the like.

Conventional technology Conventionally, as a combustion device of this type, there is a suction vaporization type combustion device used in kerosene stoves, etc., but this is used for boat fishing as shown in Figure 4. 6,
The lamp wick 1 is exposed inside the combustion chamber 8 formed between the outer flame tubes 7.
Fuel supplied from below (not shown) is vaporized and combusted by air supplied from the air holes 11 of the inner flame tube 6 and the outer flame tube 7, and the red-hot part 16 is made red hot to obtain radiant heat.

In normal strong combustion, the secondary flame f1 appears above the inner flame tube 6 and the outer flame tube 7.
is formed, and the unburned components rising in the combustion chamber 8 are almost completely combusted, thus exhibiting good exhaust gas characteristics. but,
When the exposed height of the lamp wick 1 is lowered to reduce the amount of combustion, the flame descends into the combustion chamber 8 and is formed as shown at f2.

Conventionally, under such conditions, exhaust gas characteristics, especially CO/CO
□ was rapidly deteriorating. As a result of measuring the exhaust gas inside the combustion device, the above phenomena were found to be caused by the leakage of unburned gas from the combustion chamber 8 into the inner flame cylinder 6 and the air passage 20 (a) and (b).
), and this unburned gas containing a high concentration of CO flows into the pores 13, the air holes 11 above the flame f2, and the through holes 17.
It turns out that this is because it is released more directly into the atmosphere.

Therefore, the flame f! The amount of combustion could only be adjusted within a narrow range formed above the combustion chamber 8.

Therefore, as a means to improve the above-mentioned drawbacks, the fifth
Something like the one shown in the figure has been proposed. In FIG. 5, only the points different from the above-mentioned conventional example will be explained. Reference numeral 21 denotes a flow control tube installed inside the inner flame tube 6, and a flow control region 22 is provided between the inner flame tube 6 and the inner flame tube 6.
form. 23 is an air introduction path formed inside the flow control tube 21. Reference numeral 29 denotes a plate section installed horizontally in the control area 22. Reference numeral 30 denotes a ventilation hole provided on the wall surface of the flow restriction tube 21 below the plate portion 29, and 31 represents a ventilation portion having a constant interval between the flow restriction tube 21 and the inner flame tube top plate 12. With the above configuration, the flow control tube 21 is provided inside the inner flame tube 6 to prevent unburned gas from flowing into the air introduction path 23 and to supply the gas to the control region 22 from the ventilation section 31 or the vent hole 30. The unburned gas that has flowed into the control area 22 is re-introduced into the combustion chamber 8 by the air (white arrow), where it is burned (black arrow), making it possible to significantly improve the CO/C02 characteristics during weak combustion. Ta.

Problems to be Solved by the Invention However, in the above configuration, although the deterioration of the C○/C02 characteristics caused by the inside of the inner flame tube 6 has been improved, the air passage 2
Almost no countermeasures have been taken against the deterioration of characteristics caused by CO/CO□, and the effect of improving CO/CO□ characteristics is still not fully satisfactory.

Means for Solving the Problems In order to solve the above problems, the combustion device of the present invention has a combustion device located outside the outer flame tube, extending upward from a position lower than at least the lower end of the incandescent part, and having ventilation holes in its wall surface. a plate section provided between the lower part of the suppression tube and the outer flame tube at a position lower than the lower end of the incandescent part, and a flange part from which the upper end of the suppression tube projects outward. .

Effect of the present invention With the above-described configuration, the suppression cylinder suppresses the diffusion and outflow of unburned gas into the air passage, and the air supplied from between the outer cylinder and the suppression part directs the unburned gas flowing into the suppression area into the combustion chamber. At the same time, a narrow part is formed between the outer cylinder and the upper ends of the suppression cylinder by the collar part where the upper end of the suppression cylinder projects outward, so that the direction of the air flow between the outer cylinder and the suppression part is directed toward the combustion chamber. (inside) and promotes the above action, preventing the diffusion and outflow of unburned gas into the air passage, and reintroducing the unburnt gas that has flowed into the suppression area into the combustion chamber and burning it, allowing the atmosphere to c released into.

amount is significantly reduced.

Embodiments Hereinafter, embodiments of the present invention will be described based on the accompanying drawings. Here, a commonly used cylindrical combustion device will be explained.

In FIGS. 1 and 2, reference numeral 1 denotes a lamp wick, which is a fuel supply section, and is set between an inner wick tube 2 and an outer wick tube 3 so as to be vertically movable. The upper ends of the inner core cylinder 2 and the outer core cylinder 3 are each connected to an inner fire plate 4.
, forming an outer fire pan 5, on which an inner flame tube 6 and an outer flame tube 7 are placed, respectively. During combustion, the tip of the wick I is exposed in a combustion chamber 8 formed between an inner flame tube 6 and an outer flame tube 7, where the fuel is vaporized. Reference numeral 9 denotes an outer cylinder A, and the inner flame cylinder 6, the outer flame cylinder 7, and the outer cylinder A9 are arranged approximately concentrically in order from the inside, and are integrated by a fixing pin 10. Reference numeral 11 indicates a large number of air holes provided in the inner flame tube 6 and the outer flame tube 7.

Reference numeral 12 denotes an inner flame tube top plate that closes the upper end opening of the inner flame tube 6, and has an air hole 13 that communicates from the inside of the inner flame tube 6 upward. I
4 is a flame expansion plate placed on the top plate 12 of the inner flame tube. A constriction part 15 is formed at the upper end of the outer cylinder A9, and a glowing part 16a is formed in the outer flame cylinder 7 above the constriction part 15, and a through hole 17 with a large opening is provided. red hot part 16
A vaporization section 16b is formed below a. Reference numeral 18 denotes an outer cylinder B made of a transparent material such as glass, which is placed on the outer cylinder A9. 19 is the top frame and the red hot part 16a
R is placed on the upper end of the red-hot part 16a so as to close the upper end of the air passage 20 between the outer cylinder B18 and the outer cylinder B1B, and fixes the outer cylinder B1B. Reference numeral 21 denotes a flow control tube installed inside the inner flame tube 6, and forms a flow control region 22 between it and the inner flame tube 6. 23 is flow control tube 2
This is an air introduction path formed inside the 1. Reference numeral 24 denotes a suppressor tube set outside the outer flame tube 7, which suppresses at least the red-hot part 16a.
A suppressing region 25 is formed between the lower end and the red-hot portion 16a. An arbitrary ventilation hole 26 is provided in the wall surface of this suppression tube 24 . Reference numeral 27 denotes a plate portion provided below the suppression tube 24 and between it and the outer flame tube 7. The upper end of the suppressing tube 24 is provided with a flange portion 28 that projects outward. 29 is a narrow portion formed between the collar portion 28 and the outer cylinder 818.

In the above configuration, when the wick is ignited, combustion starts, and the high-temperature combustion gas from the combustion rises in the combustion chamber 8, creating a thermal draft, and the air necessary for combustion flows into the inner flame tube 6 and outer flame tube 7. The fuel is supplied into the combustion chamber 8 through the hole 11 and the through hole 17 of the red-hot part 16a, and combustion continues. The air supplied from the space between the outer flame cylinder 7 and the outer cylinder A9 is transferred to the vaporization part 16b.
The arrow (a) indicates that the air is supplied from the air hole 11 to the combustion chamber 8, and the arrow (b) indicates that the air is supplied to the air passage 20 via the throttle section 15.
It can be divided into two streams. On the other hand, the fuel vaporized from the lamp wick 1 by the air flow (a) rises in the combustion chamber 8 as shown by the arrow (C), but a part of it diffuses and flows out into the suppression area 25 as shown by the arrow (d). However, since the suppression tube 24 is provided outside the outer flame tube 7, the diffusion and outflow of unburned gas between the suppression tube 24 and the outer tube B18 is suppressed. Although this diffusion suppression effect is greater when the suppression tube 24 is not provided with the ventilation holes 26, the same diffusion suppression effect can be obtained even with the ventilation holes 26 provided as long as the aperture ratio is not excessively increased. Further, the shape of the ventilation hole 26 may be any shape such as a round hole, a square hole, or an elongated hole. In addition, if the ventilation hole 26 is provided, from the ventilation hole 26 arrow (e)
Since air is supplied as shown in the figure, there is no air shortage and high-quality combustion can be obtained, and since the red heat of the red-hot part 16a can be seen through the vent hole 26, the appearance is not spoiled. Next, in the vicinity of the suppression area 25 directly above the plate portion 27, the pressure is lowered due to the draft force within the combustion chamber 8 than in the case where the plate portion 27 is not provided. Therefore, the amount of unburned gas that diffuses from the combustion chamber 8 to the suppression zone 25 increases, and the concentration of unburned gas near the lower end of the suppression zone 25 increases. However, in addition to suppressing the diffusion of unburned gas between the suppression cylinder 24 and the outer cylinder 8 by the suppression cylinder 24, the air passage 20 between the suppression cylinder 24 and the outer cylinder 818 is The amount of air introduced into the combustion chamber 8 through the combustion chamber 8 increases. That is, since a sufficient amount of air is supplied into the combustion chamber 8 while suppressing the diffusion and outflow of unburned gas into the air passage 20, high-quality combustion can be ensured and exhaust gas characteristics can be significantly improved. Further, referring to FIG. 2, the upper end of the restraining cylinder 24 is provided with a flange 28 that projects outward, and a narrow part 29 is formed at the upper end of the outer cylinder B18 and the restraining cylinder 24, so that the outer cylinder B18 and the restraining cylinder are The direction of the air flow between 24 and 24 is changed closer to the -N combustion chamber side (inner side), and the above-mentioned effect can be promoted. The air in the outer cylinder B18 and the suppression cylinder 24 is further supplied into the combustion chamber 8 from the ventilation hole 26 of the suppression cylinder 24 through the suppression area 25 (white arrow (e)
), and at the same time, the unburned gas that has flowed into the suppression area 25 can be reintroduced into the combustion chamber 8 (black arrow (d')), and from the suppression area 25 to between the outer cylinder B18 and the suppression cylinder 24. In addition, even if unburned gas flows out between the outer cylinder B1B and the suppression cylinder 24, the unburned gas can be removed from the combustion chamber 8 by the above-mentioned air flow.
can be re-introduced and burned. Therefore, the exhaust gas characteristics (CO/CO2) can be further improved.

FIG. 3 shows the results of measuring CO/CO□ with respect to the amount of combustion for the combustion apparatus of this example. 4th for reference
The conventional example shown in the figure (conventional example 1) and the conventional example shown in Fig. 5 (conventional example 2)
As shown in the results, this example shows better characteristics than any of the conventional examples, and the effects of the present invention are clear. In this embodiment, a cylindrical combustion device has been described, but a planar or other shape may be used, and the present invention can be applied not only to a combustion device using liquid fuel but also to a combustion device using gaseous fuel.

Effects of the Invention As described above, according to the combustion apparatus of the present invention, since the suppression tube is located outside the outer flame tube and extends upward from a position lower than at least the lower end of the red-hot part, the combustion chamber is It is possible to significantly suppress unburned gas that diffuses and flows from the air passage into the air passage.
A combustion device with good exhaust gas characteristics can be obtained in a wide combustion amount adjustment range. In addition, by providing a ventilation hole on the wall of the suppression cylinder and providing a plate between the suppression cylinder and the outer flame cylinder below the lower end of the red-hot part, air can be supplied from the ventilation hole into the combustion chamber, resulting in high quality. You can get a good combustion. Furthermore, by providing the upper end of the suppression tube with a flange that protrudes outward, the direction of the airflow between the outer tube and the suppression tube is changed further toward the combustion chamber, promoting the above effect, and the air is The vent can be fed into the combustion chamber through the suppression zone, and at the same time unburned gas that has flowed into the suppression zone can be reintroduced into the combustion chamber. In addition, it prevents unburned gas from diffusing and flowing out from the suppression zone between the outer cylinder and the suppression cylinder, and even if unburned gas flows out between the outer cylinder and the suppression cylinder, it is returned to the combustion chamber. It can be introduced and combusted, and the exhaust gas characteristics can be further improved.

Cylinder, 8... Combustion chamber, 9... Outer cylinder, 11
...Air hole, 16a...Red hot part, 16
b... Vaporization section, 24... Suppression tube, 26
...Vent hole, 27...Plate part, 28...
...Tsubabe.

Name of agent: Patent attorney Shigetaka Awano (1 person)

[Brief explanation of drawings]

FIGS. 1 and 2 are sectional views of essential parts of a combustion device according to an embodiment of the present invention, FIG. 3 is a characteristic diagram showing the effects of the same device, and FIG. 4 is a sectional view of essential parts of a conventional combustion device. , FIG. 5 is a sectional view of a main part of another conventional example. 1...Fuel supply section, 6...Inner flame tube, 7
・・・・・・Outer flame q---Dato Tube 11- Ken Qi Xiang" Joy 2 figure"/coz ω

Claims (1)

[Claims] an outer flame tube having a large number of air holes and consisting of a vaporization section and a red-hot section formed above the vaporization section; an inner flame tube having a large number of air holes disposed inside the outer flame tube; an outer cylinder located on the outside of the outer flame cylinder; a fuel supply section configured to be vertically movable at a lower part of the combustion chamber formed between the outer flame cylinder and the inner flame cylinder; and an outer side of the outer flame cylinder. between a suppression tube located at least at a position lower than the lower end of the red-hot part and upwardly extending upward from a position lower than the lower end of the red-hot part and having a ventilation hole in its wall, and an outer flame cylinder located below the suppression cylinder and lower than the lower end of the red-hot part. A combustion device comprising: a plate portion provided therein; and a flange portion from which an upper end of the suppression cylinder projects outward.