JPH02197703A - Burner - Google Patents

Abstract

PURPOSE:To prevent the diffusion and flow-out of an unburned gas to an air channel and at the same time reintroduce the unburned gas that has flown out to a combustion chamber and make it burn there and reduce the CO that is discharged to the atmosphere by providing a control cylinder located out of an external cylinder and extending upwards from a position lower than the lower end of a red hot section. CONSTITUTION:A wick 1 that is a combustion supply section is provided between the wick inner cylinder 2 and wick outer cylinder 3 in such a way that the wick 1 can move freely up and down. The end of the wick 1 is exposed during the combustion in a combustion chamber 8 which is formed between an inner flame cylinder 6 and outer flame cylinder 7, and the fuel is vaporized there. The inner flame cylinder 6 and outer flame cylinder 7 are provided with many air holes 11. Then an air channel 20 is formed between the outer flame cylinder 7 and outer cylinder B18. A suppression cylinder 24 is set up out of the outer flame cylinder 7 and it extends upwards from a position lower than at least the lower and of a red hot section 16a to form a suppression area 25 against the red hot section 16a. Further on the wall face of the suppression cylinder 24 an arbitrary vent hole 26 is provided. Furthermore, it is desirable to provide a plate section 27 below the suppression cylinder against the outer flame cylinder 7.

Description

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

BACKGROUND OF THE INVENTION Conventionally, as a combustion device of this type, there has been a suction vaporization type combustion device used in kerosene stoves, etc., and this was generally of the type shown in FIG. In FIG. 4, ``■'' is a lamp wick which is set between the inner wick tube 2 and the outer wick tube 3 so as to be able to move up and down.

The upper ends of the inner core tube 2 and the outer core tube 3 form an inner flame tray 4 and an outer flame tray 5, respectively, on which an inner flame tube 6 and an outer flame tube 7 are placed. During combustion, the tip of the wick l is exposed in a combustion chamber 8 formed between an inner flame tube 6 and an outer flame tube 7, where combustion is vaporized. 9 is outer cylinder A, inner flame cylinder 6, outer flame cylinder 7, outer cylinder A
9 are arranged in a substantially concentric circle sequentially from the inside and are integrated by a fixed bin 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 communicating upward from the inside of the inner flame tube 6. 14 is the inner flame tube top plate 1
It is a flame expansion plate placed R on 2. A constriction part 15 is formed at the upper end of the outer cylinder A9, and a red-hot part 16 is formed in the outer flame cylinder 7 above the constriction part 15, and a through hole 17 with a large opening is provided. 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 air passage 2 between the red-hot part 6 and the outer cylinder 818 in the top frame.
It is placed on the J two ends of the incandescent part 16 so as to close the upper end of the 0, and fixes the outer cylinder 18.

In the above configuration, when the wick l is ignited, combustion starts, and the high temperature combustion gas generated by combustion rises in the combustion chamber 8, creating a thermal draft, and the air necessary for combustion is transferred to the inner flame tube 6 and the outer flame tube. 7 air hole 11 and red-hot part 16 through hole 1
7 into the combustion chamber 8 to continue combustion, making the red-hot part 16 red-hot to obtain radiant heat. In normal strong combustion, a secondary flame rl is formed above the inner flame tube 6 and the outer flame tube 7, and the unburned components rising in the combustion chamber 8 are almost completely combusted, so that good exhaust gas characteristics are exhibited. However, if the exposed height of the wick 1 is lowered to reduce the amount of combustion, the flame will spread to the combustion chamber 8.
It descends inward to form a 12-like shape. Conventionally, under such conditions, exhaust gas characteristics, particularly Co/Co2, have deteriorated rapidly. As a result of measuring the exhaust gas inside the combustion device, it was found that the above phenomenon was caused by the flow of combustion gas inside the inner flame tube 6 and the air passage 20. FIG. 5 shows the results of measuring the 00 distribution in the height direction of the CC line (inside the inner flame tube 6) and the D-D' line (air passage 20) of the combustion device.

Near the upper end, 11000PP at C-C” position during weak combustion,
It showed a very high value of 3000 PPM or more at the D-D" position. During strong twist firing, the combustion is almost complete with flame f1, resulting in good exhaust gas characteristics, but during weak combustion, the flame reaches combustion chamber 8.
Since these high concentrations of CO are directly released into the atmosphere without passing through the flame zone, unburned gas flows from the combustion chamber 8 to the inner flame tube 6. Broken lines (a), (1)) leaking inside and into the air passage 20
It is clear that such a flow exists, and this unburned gas containing a high concentration of CO is directly released into the atmosphere from the pores 13, the air holes 11 above the flame r2, and the through holes 17. /CO□ characteristics deteriorate rapidly. Therefore, the flame f
The amount of combustion could only be adjusted within the range where No. 2 was formed above the combustion chamber 8.

Therefore, as an example of means for improving the above-mentioned drawbacks, a method as shown in FIG. 6 has been proposed.

In FIG. 6, only the points different from the above conventional example will be explained.
Reference numeral 21 denotes a flow control tube disposed inside the inner flame tube 6, and forms a flow control region 22 between it and the inner flame tube 6. 23 is an air introduction path formed inside the flow control tube 21. Reference numeral 28 denotes a plate section installed horizontally on the flow control tube 22. Reference numeral 29 denotes a ventilation hole provided on the wall surface of the flow restriction tube 21 below the plate portion 28, and 30 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, on the inside of the inner flame tube 6, the flow control tube 21 prevents unburned gas from flowing into the air introduction path 23, and the air is supplied to the flow control tube 22 from the ventilation section 30 and the vent hole 29. (white arrow), the unburned gas that has flowed into the flow control tube 22 is reintroduced into the combustion chamber 8 (black arrow) and burned, making it possible to significantly improve the Co/Co characteristics during weak combustion. .

Problems to be Solved by the Invention However, in the above configuration, C due to the inside of the inner flame tube 6
o/Co, although the deterioration of characteristics was improved, the air passage 20
Almost no countermeasures have been taken against the deterioration of characteristics caused by this. As a countermeasure for the air passage 20, a configuration as shown in FIG. 7 has been proposed. This has a flow control plate 31 provided inside the outer cylinder B1B. With this configuration, a portion of the unburned gas that has flowed into the air passage 20 is reintroduced into the combustion chamber 8 by the air flow, so that the Co/Co characteristics are improved. However, even with this configuration, C into the air passage 20
CO/C is not very effective in suppressing the diffusion and outflow of O.
The effect of improving O□ characteristics was also not fully satisfactory.

Means for Solving the Problems In order to solve the above problems, the combustion apparatus of the present invention has a suppressor tube located outside the outer flame tube and extending upward from a position lower than at least the lower end of the red-hot part. .

Effect of the Invention With the above-described configuration, the present invention prevents unburned gas from diffusing and flowing out into the air passage by the suppression tube, and also directs unburned gas flowing into the air passage into the combustion chamber by air supplied from between the outer tube and the suppression part. The amount of CO emitted into the atmosphere is significantly reduced.

Embodiments Hereinafter, embodiments of the present invention will be explained based on the attached drawings. Here, the cylindrical combustion device used in -C will be explained.

In Fig. 1, l is the wick which is the combustion supply part, and the wick inner cylinder 2
and the core outer cylinder 3 so as to be vertically movable. The upper ends of the inner core tube 2 and the outer core tube 3 form an inner flame tray 4 and an outer flame tray 5, respectively, and an inner flame tube 6 and an outer flame tube 7 are placed thereon, respectively. During combustion, the tip of the wick l is exposed in the combustion chamber 8 formed between the inner flame tube 6 and the outer flame tube 7, where the fuel r1 is vaporized. 9 is outer cylinder A, inner flame cylinder 6, outer flame cylinder 7, outer cylinder A
9 are arranged in a substantially concentric circle sequentially from the inside and are integrated by a fixed bin 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 communicating upward from the inside of the inner flame tube 6.

14 is a flame expansion plate placed on the inner flame tube top plate I2.

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. A vaporizing section 16b is formed below the red-hot section 16a. 18
An outer cylinder B made of a transparent material such as glass is placed on the outer cylinder A9. 19 is the top frame and red hot part 1
It is placed on the upper end of the glowing part 16 so as to close the upper end of the air passage 20 between the outer cylinder B1B and the outer cylinder B18, and fixes the outer cylinder B18. 21 is a flow control tube installed inside the inner flame tube 6,
A control area 22 is formed between the inner flame cylinder 6 and the inner flame cylinder 6. 23 is an air introduction path formed inside the flow control tube 21. Reference numeral 24 denotes a suppressor tube set outside the outer flame tube 7, which suppresses at least the red-hot part 16a.
It extends upward from a position lower than the lower end of and forms a suppression area 25 between it and the red-hot part 16a. Furthermore, an arbitrary ventilation hole 26 is provided in the wall surface of the suppression tube 24. Reference numeral 27 denotes a plate portion provided below the suppression tube and between it and the outer flame tube 7.

In the above configuration, when the lamp wick 1 is ignited, combustion starts, and high temperature combustion gas due to combustion rises in the combustion chamber 8, creating a thermal draft, and the air necessary for combustion is transferred to the inner flame tube 6 and the outer flame tube 7. The fuel is supplied into the combustion chamber 8 through the hole 11 and the through hole 17 of the glowing part 16a, and combustion continues.

The air supplied from the space between the outer flame cylinder 7 and the outer cylinder A9 is supplied from the air hole 11 of the vaporization part 1 (ib) to the combustion chamber 8, and is supplied to the air passage 20 via the arrow (al) and the throttle part 15. On the other hand, the air flow (a)
The fuel vaporized from the wick l rises in the combustion chamber 8 as shown by the arrow (C), but a part of it diffuses into the air passage 20 as shown by the arrow (d). However, there is a suppression tube 2 on the outside of the outer flame tube 7.
4 is set, the diffusion and outflow of unburned gas between the suppression cylinder 24 and the outer cylinder 818 is suppressed.

Although this diffusion prevention effect is greater when the suppression cylinder 24 is not provided with the ventilation holes 26, the same diffusion prevention 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 a round hole, a square hole, an elongated hole, or the like. In addition, if the ventilation hole 26 is provided, air is supplied from the ventilation hole 26 as shown by the arrow (e), so there is no shortage of air and a good combustion condition can be obtained. Since the red-hot state of the red-hot portion 16a can be seen, the appearance is also good. Further, in this embodiment, since the plate portion 27 is provided between the suppression tube 24 and the outer flame tube 7 located at a lower position than the lower end of the red-hot portion 16a, the characteristics are further improved. That is, the pressure in the vicinity directly above the plate portion 27 in the suppression region 25 is lower than that in the case where the plate portion 27 is not provided due to the draft force within the combustion chamber 8 . 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 becomes high. However, the suppression tube 2
4 suppresses the diffusion of unburned gas between the suppression tube 24 and the outer cylinder 8, and the combustion chamber 8 is also The amount of air introduced into increases. That is, since the diffusion and outflow of unburned gas into the air passage 20 is suppressed as much as possible, and a sufficient amount of air is supplied into the combustion chamber 8, a good combustion state can be maintained and the exhaust gas characteristics can be significantly improved. Plate part 2
Although this effect is greater when shielding between the suppression tube 24 and the outer flame tube 7 is provided, there may be some gap. Fig. 2 shows the effect of measuring the 604 degree distribution in the height direction at the positions A-A' and I3-B'' for this embodiment in Fig. 1.For comparison, the E-E of the conventional example in Fig. 6 is shown. The results for the 'position are also shown. At the A-A' position, a high concentration of CO is detected near the lower end of the control area 25, but it rapidly decreases as it goes upward, and above the upper part of the suppression tube 24, CO is detected at a high concentration. It is 4 degrees, which is almost the same as the 'position.At the B-B' position, the value is low from the bottom, and the value is almost constant in the height direction.
This result shows that the suppression tube 24 significantly suppresses the diffusion and outflow of unburned gas. In addition, the conventional example E
The value of 004 degrees is significantly reduced compared to the value at the -E' position, and the effect of this embodiment is obvious. FIG. 3 shows the results of measuring Co/Co□ with respect to the amount of combustion in the combustion apparatus of this example. For reference, the conventional example in Fig. 4 (conventional example 1)
The results for the conventional example (Conventional Example 2) shown in FIG. In this embodiment, a cylindrical combustion device has been described, but a planar or other shape may be used.

Furthermore, it is applicable not only to combustion devices using liquid fuel but also to combustion devices using gaseous fuel.

Effects of the Invention As described above, according to the combustion apparatus of the present invention, 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, so that combustion is suppressed. It is possible to suppress unburned gas diffusing and flowing out from the chamber to the air passage, and it is possible to obtain a combustion device with good exhaust gas characteristics in a wide combustion amount adjustment range. Furthermore, air can be efficiently supplied into the combustion chamber from the ventilation hole by providing a ventilation hole in the wall surface of the suppression cylinder and by providing a plate between the suppression cylinder and the outer flame cylinder below the lower end of the glowing body. Good combustion conditions can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the main part of a combustion device according to an embodiment of the present invention, Figs. 2 and 3 are characteristic diagrams showing the effects of the same device, and Fig. 4 is a sectional view of the main part of a conventional combustion device. , FIG. 5 is a characteristic diagram of a conventional combustion device, and FIGS. 6 and 7 are sectional views of main parts of other conventional examples. ■... Combustion supply section, 6... Inner flame tube, 7
...Outer flame tube, 8... Combustion chamber, 9...
...Outer cylinder, 11...Air hole, 16a...
・・Red hot part, 24・・・Suppression tube, 26・Old・・Vent hole, 27・・・Plate part. Name of agent: Patent attorney Shigetaka Awano, 1 name, 2 Figure 132 (PPtr - Funeral diagram)

Claims (3)

[Claims] (1) An outer flame tube having a large number of air holes and consisting of a vaporizing section and a red-hot section formed above the vaporizing section, and an inner flame tube having a large number of air holes arranged inside the outer flame tube. an outer cylinder located outside the outer flame cylinder; a combustion supply section that is vertically movable at a lower part of the combustion chamber formed between the outer flame cylinder and the inner flame cylinder; and the outer flame cylinder. A combustion device including a suppression tube located outside of the incandescent part and extending upward from a position lower than at least a lower end of the incandescent part. (2) The combustion device according to claim (1), wherein the suppression cylinder has a vent hole in its wall. (3) The combustion device according to claim (1) or (2), wherein a plate portion is provided between the lower part of the suppression cylinder and the outer flame cylinder at a position lower than the lower end of the red-hot part.