JPH02225903A - combustion device - Google Patents

Abstract

PURPOSE:To shield the diffusion of unburnt gas to the air passage of the unburnt gas and at the same time attempt to reduce CO by providing a suppression cylinder which extends upwards from the lower end of a red hot section outside of an outer flame cylinder and has vent holes in its wall face, a plate section between the lower section of the suppression cylinder and the outer flame cylinder, and a section with no hole in the wall face of the suppression cylinder. CONSTITUTION:The fuel that is vaporized from a wick 1 by the air flow (a) that is supplied from the space between an outer flame cylinder 7 and outer cylinder 9 and also supplied from air holes 11 of a vaporization section 16b to a combustion chamber 8 ascends as shown by the arrow mark (c) in the combustion chamber 8, but the pressure of the vaporized fuel is lowered near the section right above a plate section 27 by the draft force in the combustion chamber 8 because of the provision of the plate section 27 between a suppression cylinder 24 and the outer flame cylinder 7 at a position lower than the lower end of a red hot section 16a. Accordingly the unburned gas that diffuses to the suppression zone 25 from the combustion chamber 8 as shown by the arrow mark (d) increases. With this arrangement while the diffusion and flow-out of the unburnt gas to an air channel 20 are suppressed as much as possible, air is sufficiently supplied to the combustion chamber 8 through vent holes 26 and the state of combustion is kept good. Further, because of the provision of a section 28 with no hole the direct diffusion of unburnt gas in a high concentration to the air channel 20 is prevented so that the concentration of the unburnt gas can be kept low.

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.

BACKGROUND ART Conventionally, as this type of combustion device, there is a suction vaporization type combustion device used in kerosene stoves, etc., but this generally involves connecting the tip of the wick 1 to the inner flame tube 6 and the outer flame tube 6, as shown in Fig. 4. The fuel exposed in the combustion chamber 8 formed between the flame tubes 7 and supplied from below the lamp wick 1 (not shown) is vaporized by the 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 was 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.
, and almost completely burns the unburned components that have risen in the combustion chamber 8, so it exhibits good exhaust gas characteristics.However,
When the exposed height of the wick l 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, the characteristics of wandering gas, especially Co/C
As a result of measuring the exhaust gas in the combustion device, the phenomenon of 0 or more where ot was rapidly deteriorating was found to be due to the broken lines (a) and (a) where unburned gas leaks from the combustion chamber 8 to the inside of the inner flame tube 6 and the air passage 20.
A flow like b) exists, and this unburned gas containing high concentration of CO flows into the pores 13, the air holes 11 above the flame r2, and the through holes 1.
7, it was found that this was due to direct release into the atmosphere. Therefore, the combustion amount could only be adjusted within the range where the flame f2 was 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. 30 is a ventilation hole provided on the wall surface of the flow control tube 21 below the plate part 29, and 31 is a ventilation portion having a constant interval between the flow control tube 21 and the inner flame tube top plate 12. flame cylinder 6
Regarding inward deviation, the provision of the flow control tube 21 prevents unburned gas from flowing into the air introduction path 23, and also prevents the air (
Since the unburnt gas that has flowed into the control area 22 by the white arrow) is reintroduced into the combustion chamber 8 (black arrow) and combusted, the Co/Co characteristics during weak combustion can be significantly improved.

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 has been improved, the air passage 20
Almost no countermeasures have been taken against the deterioration of characteristics caused by Co/Co! The effect of improving characteristics was still not fully satisfactory.

Above are the means to solve the problem! In order to solve the problem III, the combustion apparatus of the present invention includes a suppression tube located outside the outer flame tube, extending upward from a position lower than at least the lower end of the red-hot part, and having a ventilation hole in its wall surface, and this suppression tube. A plate part is provided between the lower part and the outer flame cylinder at a position lower than the lower end of the red-hot part, and a non-porous part of a predetermined height is provided on the wall surface of the suppression cylinder above the plate part.

Function: With the above-described configuration, the plate part lowers the pressure between the outer flame cylinder and the suppression part, so unburned gas flows out, but the non-porous part prevents direct diffusion into the air passage outside the suppression part. shielded. In addition, the suppression tube prevents unburned gas from diffusing and outflowing into the air passage, and the air supplied between the outer tube and the suppression section reintroduces the unburned gas that has flowed into the suppression area into the combustion chamber and burns it. C released into the atmosphere
The amount of O 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 Fig. 1, 1 is the wick which is the fuel supply part, and 2 is the wick inner cylinder.
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 within the combustion chamber 8 formed between the inner flame tube 6 and the outer flame tube 7, where the fuel is vaporized. 9 is outer cylinder A, inner flame cylinder 6, outer flame cylinder 7, outer cylinder A9
are sequentially arranged substantially concentrically 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 communicating upward from the inside of the inner flame tube 6.

14 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. 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 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 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, and at least the red-hot part 16
It extends upward from a position lower than the lower end of a and forms a suppression region 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. Reference numeral 28 denotes a non-porous portion provided at a predetermined height directly above the plate portion 27 on the wall surface of the suppressing cylinder 24, and is provided at least to a position opposite to the first stage of the through hole 17 or higher.

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 to the combustion chamber 8 from the air hole 11 of the vaporization part 16b via the arrow (a) and the constriction part 15 to the air passage 20. The flow is divided into the flows shown by arrow (b). - 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 in this embodiment, the suppressor cylinder 24 and the red-hot part 1
Since the plate part 27 is provided between the outer flame cylinder 7 and the lower end of the combustion chamber 6a, the plate part 27 is not provided in the vicinity directly above the plate part 27 in the suppression area 25 due to the draft force within the combustion chamber 8. The pressure will be lower than in the case. Therefore, as shown by arrow (d), 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. but,
In addition to suppressing the diffusion of unburned gas between the suppression tube 24 and the outer tube 818 by the suppression tube 24, the suppression tube 24 and the outer tube B
The amount of air introduced into the combustion chamber 8 from the air passage 20 between the combustion chambers 18 and 18 through the vent hole 26 of the suppression tube 24 increases. That is, since the diffusion and outflow of unburned gas into the air passage 20 is suppressed by vibration and sufficient air is supplied into the combustion chamber 8, a good combustion state can be maintained and exhaust gas characteristics can be significantly improved. Furthermore, since the non-porous part 28 is provided, direct diffusion of highly concentrated unburned gas from the lower end of the suppression area 25 into the air passage 20 is prevented, so if the non-porous part 28 is not provided, Diffusion of unburned gas into the air passage 20 can be suppressed, and the concentration of unburned gas can be kept low. Therefore, the exhaust gas characteristics (Co/Co□) can also be further improved. This effect is greater if the suppression tube 24 and the outer flame tube 7 are shielded, but there may be some gap.Also, the shape of the ventilation hole 26 may be a round hole, a square hole, or a square hole, as long as the opening is not extremely large. It can be any birch shape such as a long hole.
In addition, since air is supplied into the combustion chamber 8 from the ventilation hole 26 to the oak indicated by the arrow (e), a good combustion condition can be obtained without running out of air. It is good for the appearance because the red-hot state can be seen.
This is the result of measuring the CO concentration distribution in the height direction at position B (solid line).
8 (dashed line) and the results for the conventional example shown in FIG. 6 at the E-E' position (-dotted chain line) 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 below the upper part of the suppression tube 24, the concentration is almost the same as at the B-B'' position. At the B-B' position, the value is low starting from the lower end, and the value is almost constant in the height direction.This result shows that the diffusion and outflow of unburned gas is significantly suppressed by the suppression tube 24. It can be seen that the CO14 degree is significantly reduced compared to the value of the E-E' position in the conventional example, and the CO concentration is also reduced compared to the case without a non-porous part, which shows the effect of this example. It is clear that. Figure 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 (conventional example 1) in Figure 4 and the conventional example (conventional example 1) in Figure 5 are shown. Although the results for the conventional example (Conventional Example 2) are also shown, this example shows better characteristics than the conventional example, and the effects of the present invention are clear. Although the present invention has been described, it may have a planar shape or other shapes, and can be applied 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, since the suppression tube is provided which 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 the unburned gas that diffuses and flows out from the air passage into the air passage, and it is possible to obtain a combustion device with good exhaust gas characteristics in a wide range of combustion amount adjustment. Further, by providing a plate portion between the suppression tube and the outer flame tube below the red-hot lower end, air can be efficiently supplied into the combustion chamber from the ventilation hole, so that good combustion conditions can be obtained. In addition, since the suppression cylinder wall surface directly above the plate part has a plate part of a predetermined height, the diffusion and outflow of high concentration unburned gas from the lower end of the suppression area to the air passage is suppressed, and the unburned gas in the air passage is The concentration can be reduced and the exhaust gas characteristics can be further improved.

[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 sectional view of a main part of another conventional example. 1...Fuel 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 ...
-Vent hole, 27...Plate part, 28...Non-porous part. Agent's name: Patent attorney Shigetaka Awano 1 fool 2 Figure CO key figure / -m-rimmer? -141 Toidemi #Setsu Otsu・-Inner Flame Palace 7・-yF Moxibustion Snow 8-・Burning! 9 ・-1 Dato table-If・-existing pores

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. a suppression cylinder located at least at a position lower than the lower end of the incandescent part and extending upward from a position lower than the lower end of the incandescent part, and having a ventilation hole in its wall surface; A combustion device comprising: a plate portion having a fixed height, and a non-porous portion having a predetermined height provided on the wall surface of the suppression cylinder above the plate portion.