JPS63210510A - Combustion device - Google Patents

Abstract

PURPOSE:To obtain a combustion device, prominent in burning characteristics, wide in the regulating width of the amount of combustion, and safe, by a method wherein stages of flow control tubes are provided in up-and-down direction so as to form venting sections, having the bottom surfaces thereof in flow control areas formed between an inner flame tube and communicating with a combustion chamber, while an interval between the flow control areas is specified. CONSTITUTION:A flow control tube B23 is provided so as to have the bottom surface thereof in a flow control area B24 in the same manner as the flow control tube A22 while an interval (1) between the flow control area A22 and the flow control area B24 is specified so as to be 20% or less of the inner diameter D of an inner flame tube 6. When the exposed height of a wick 1 is reduced to reduce the amount of combustion, flame descends gradually into a combustion chamber 8 and becomes the flame (fs). In this case, the amount of evaporated gas is reduced remarkably, therefore, the amount of unburnt gas, which flows into the flow control area B24, is also reduced. Accordingly, a mixing area, in which the unburnt gas is mixed with air shown by white arrow signs (e) in a diagram, descends to improve in the vicinity of an area D. Holding flame is formed in this part, and the wall surface of the inner flame tube 6 is brought into red-hot condition. Combustion is promoted and the combustion is finished in the flame (fs) formed above the wall surface of the inner flame tube 6. In this case, most of unburnt gas, flowing into the flow control area B24, is burnt in the flame (fs); therefore, exhaust gas characteristic (CO/CO2) will never become worse.

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 OF THE INVENTION Conventionally, as a combustion device of this type, there is a suction vaporization type combustion device used in kerosene stoves, etc., but as shown in Fig. 6, this type of combustion device has an inner flame tube with many air holes. The tip of the wick 1 is exposed in the combustion chamber 8 formed between the outer flame tube 6 and the outer flame tube 7 to vaporize and burn the fuel. Normally, the outer flame cylinder 7 has a through hole 1 with a large opening area above the constriction part 15 of the outer cylinder 9.
The fuel vaporized from the lamp wick 1 and the air introduced into the combustion chamber 8 from the through hole 17 are mixed and combusted, making the red-hot part 16 red-hot and obtaining radiant heat. .

Problems to be Solved by the Invention However, the above configuration has caused the following problems.

In normal strong combustion, as shown in Figure 5, the inner flame tube 6 and the outer flame tube 7
A secondary flame f1 is formed above, and the unburned components rising in the combustion chamber 8 are completely combusted, so that good exhaust gas characteristics are exhibited. However, 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. In this case, the flame f3 that was formed in the air holes 11 and through holes 17 in the inner flame part is no longer formed above the flame f2. Conventionally, under such conditions, exhaust gas characteristics, especially G
o/GO2 was rapidly deteriorating. Furthermore, if the combustion device is used for a long time in a well-sealed room, the amount of combustion will gradually decrease as the oxygen concentration decreases, but as mentioned above, if the flame descends into the combustion chamber 8, a large amount of CO will be generated. I was in a situation where I would. As a result of measuring the exhaust gas inside the combustion device, it became clear that the main cause of the above phenomenon was the flow inside the inner flame cylinder 6. That is, A in FIG.
-The CO concentration at line A' is 110 near the upper end during weak combustion (the state where the flame becomes f2 and descends into the combustion chamber 8).
There were more than 00pp. From this, it is clear that there is a flow inside the inner flame tube 6 that leaks from the combustion chamber 8 to the inside of the inner flame tube 6 as indicated by the broken line, and this mixed gas containing high concentration of CO flows into the vent hole 1. The Co/CO2 characteristics deteriorate rapidly as the Co/CO2 characteristics are directly released into the atmosphere from the air holes 11 above the flame f2. This phenomenon occurs even when the oxygen concentration decreases due to long-term combustion in a well-sealed room (oxygen deficient condition).

The present invention solves these conventional problems, and by preventing the rapid deterioration of exhaust gas characteristics during weak combustion or in oxygen-deficient conditions, the present invention achieves good combustion characteristics, a wide range of combustion amount adjustment, and safe combustion. The purpose is to obtain equipment.

Means for Solving the Problems In order to solve the above-mentioned problems, the combustion device of the present invention has a combustion device that extends upward from the vicinity of the position facing the lamp wick inwardly of the inner flame cylinder;
The control area formed between the inner flame cylinder and the inner flame cylinder is shielded by its bottom surface,
A plurality of flow control tubes are provided in the vertical direction to form a ventilation section communicating with the combustion chamber, and the interval between the flow control tubes is set to 20 inches or less with respect to the inner diameter of the inner flame tube.

Effect: With the above-described configuration, the present invention introduces unburned gas into the control area, and intensively burns the unburned gas from the ventilation area while mixing it with clean air supplied to the ventilation area above the flow restriction tube. supply to the chamber to promote combustion. Furthermore, since multiple flow restriction tubes are provided, the combustion gas that flows into the flow restriction tubes above the flame becomes gas in which combustion has progressed considerably, making it possible to prevent a large amount of CO from being released.

Embodiments Hereinafter, embodiments of the present invention will be described based on the accompanying drawings.

In FIG. 1, reference numeral 1 denotes a lamp wick, which 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 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 1 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, and the inner flame cylinder 6, the outer flame cylinder 7, and the outer cylinder 9 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 a ventilation 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 9, and a glowing 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.

18 is a transparent tube made of a transparent material such as glass, and the outer tube 9
is placed on top. 19 is the top frame and red hot part 1
It is placed on the upper end of the incandescent part 16 so as to cover the upper end of the air passage 2° between the transmitting tube 6 and the transmitting tube 18, and fixing the transmitting tube 18. Reference numeral 21 denotes a flow control tube A installed inside the inner flame tube 6, which extends upward from near a position facing the tip of the wick 1, and shields a control area A22 formed between the inner flame tubes 6 with its bottom surface. It is set up as follows. Reference numeral 23 denotes a flow restriction tube B set above the flow restriction tube, and is provided so as to shield the restriction area 824 with its bottom surface, similar to the flow restriction tube A22. The interval 1 between the control area A22 and the control area B24 is set to 20% or less with respect to the inner diameter of the inner flame tube 6.

Reference numeral 25 denotes a ventilation section A that is set to have a constant interval between the flow control tube A21 and the flow control tube 823.

Reference numeral 26 indicates a ventilation part set to have a constant interval between the flow control tube B24 and the inner flame tube top plate 12.

27 is an air introduction path.

In the above configuration, when the lamp wick 1 is ignited, combustion starts,
High-temperature combustion gas from combustion rises in the combustion chamber 8, creating a thermal draft, and the air necessary for combustion flows into the inner flame tube 6,
The air is supplied into the combustion chamber 8 through the air hole 11 of the outer flame tube 7 and the through hole 17 of the red-hot part 16, and combustion continues. The flow of combustion gas and air inside the inner flame cylinder 6 and the combustion chamber 8 at this time will be explained with reference to FIG. 2. Air supplied from inside the inner flame tube 6 is supplied from below the flow control tube A21 to the vicinity of the lamp wick 1 as indicated by the white arrow a.
The air introduction path 27 is divided into white arrows that ascend. A part of the rising air passes through the ventilation section A25 as indicated by the white arrow C and is supplied to the combustion chamber 8. Further, the air supplied above the inner flame cylinder 6 is supplied to the combustion chamber 8 and above from the air hole 11 and the vent hole 13 as shown by the white arrow d. A portion also descends to the control area mill 24 as shown by the white arrow e, and is also supplied to the combustion chamber 8 from the air hole 11 located relatively below. On the other hand, the fuel vaporized by the air flow port arrow a becomes a mixed gas with air and rises in the combustion chamber 8 mainly as shown by the black arrow f. However, because the air flow opening arrows C, d, and e create a negative pressure in the control area A22 and the control area mill 24, part of the mixed gas flows into the control area A22 and control area 824 as shown by black arrows g and h. do. Therefore, the control area A22 and the control area 824 are filled with unburned gas. This unburned gas is mixed with the air flow C and the air flows d and e in the ventilation part A25 and the ventilation part 26, and is mixed with the air flow d and e at the black arrow 1. It is again supplied to the combustion chamber 8 as shown in J. Therefore, during strong twist firing, unburned gas and air are well mixed and supplied to the vicinity of the upper end of the combustion chamber 8 near the upper end of the inner flame tube 8, so that combustion is efficient near the area C, and furthermore, the unburned gas and air are not completely combusted here. The unburned gas is combusted by the flame f2 formed above. Next, when the exposed height of the lamp wick 1 is lowered to reduce the amount of combustion, the flame gradually descends into the combustion chamber 8 and becomes a flame f3. The flow in this case is the same as that during strong twist firing, but since the amount of vaporized gas is significantly reduced, the amount of unburned gas flowing into the control area mill 24 is also reduced. Therefore, the mixing area with the air flow opening arrow e moves downward, and the area near the area becomes a good mixing area, and a flame holding state is formed in this area, causing the wall surface of the inner flame tube 6 to become red hot.
A flame f that promotes combustion and is formed above it.

complete the combustion. In this case, most of the unburned gas that has flowed into the control area 824 is supplied to the combustion chamber 8 by the air flows d and e, and is burned by the flame f, so in the control area mortar 24 facing above the flame f3, the unburned gas There are almost no components, and the air discharged from the air holes 11 and 13 above the flame f3 is clean, and the exhaust gas characteristics (Co/CO2) are not deteriorated.

By the way, the CO concentration near the ventilation section 826 is 30 to 50 pp.
It was found that this was significantly reduced compared to the conventional example at approximately m. However, if the combustion amount is further reduced and the flame descends further, the temperature above the inner flame cylinder 6 will drop, causing the air flow to decrease.
Although combustion is not promoted even though sufficient air is supplied to the control area 824 by worsens. However, if the combustion amount is further reduced and the flame is formed below the lower end of the flow control tube 23 like frn, the temperature near the flame frn will be high, and sufficient air will not be supplied by the air flow C from the ventilation part A25. Therefore, combustion is promoted near region E. In this case, the exhaust gas flows into the upper control region B24, but the combustion power of this exhaust gas component has considerably advanced in the flame fm, and the CO ratio in the exhaust gas component is not so high.

Therefore, the exhaust gas characteristics do not deteriorate.

The above has described the case where the exposure height of the lamp wick 1 is lowered to reduce the amount of combustion during normal combustion, but the same effect can be obtained when the lamp is burned for a long time in a well-sealed room. In other words, under oxygen-deficient conditions, the amount of combustion decreases as the oxygen concentration decreases, and a phenomenon similar to that observed when the exposed height of the wick 1 is lowered to reduce the amount of combustion is observed. Good characteristics too! bawl.

Figure 3 shows the amount of Co burnt versus the amount of combustion for the conventional example and this example.
/CO2 characteristics, and FIG. 4 shows the results of measuring oxygen deficiency characteristics. In addition, the oxygen deficiency characteristics are caI at about 1250 in the initial combustion 1.
/h. In this example, both the Co/CO2 characteristics and the oxygen deficiency characteristics were significantly improved, and the effects of the present invention are clear.

Furthermore, in order to make the most of the above effects, it is an extremely important component to optimally set the interval l between the control area A22 and the control area l324, and FIG. control area and combustion amount for 2,500 to 1
,000 cal/h over a wide range of Co/CO2
FIG. According to experiments, the interval of the control area with respect to the inner diameter of the inner flame tube 6 is 2.
When the temperature exceeds 0, Co/CO2 deteriorates rapidly and JIS
This significantly exceeds the standard value of Co/CO20,002.

This is the extent to which the effect of the control area is reduced. On the other hand, 20%
There was no sudden deterioration of the Co/CO2 value in the following cases, and the JIS standard value of Co/C: 020.90 in all cases.
2 or less. This is the range in which the effect of the control area can be maximized, and the control area A22 and control area B
It is extremely important to set the interval e of 24 to 20% or less of the inner diameter of the inner flame cylinder. Incidentally, this has a similar effect regarding oxygen deficiency characteristics.

In the above embodiment, the case where the control area is two stages has been described, but the same or better effect can be obtained even if a configuration with three or more stages is used.

Effects of the Invention As described above, according to the combustion apparatus of the present invention, the following effects can be obtained.

(1) Since the flow restriction tube is provided inside the inner flame cylinder, unburnt gas containing high concentration of CO flows into the restriction region due to the air flow rising through the air introduction path, but it is not supplied to the ventilation section. According to the amount of combustion, a good mixed state can be formed at a certain height of the inner flame cylinder, and combustion can be promoted.

(2) The flow of unburned gas leaking into the inner flame cylinder is blocked by the air supplied from the vent. Due to this shielding effect, the control area above the flame and the air introduction passage contain almost no unburnt gas, and high-concentration co2 is directly released into the atmosphere from the inner flame tube air vents and vents above the flame. Never.

(3) Even though sufficient air is introduced into the control area when the combustion amount decreases further and the flame descends further,
As the temperature above the flame decreases, combustion is not promoted sufficiently.
Cog gradually increases and the Co/CO2 characteristics tend to deteriorate gradually, but since multiple flow control tubes are provided, when the flame drops below the upper flow control tube, the flame is supplied from the ventilation section directly below it. Combustion is promoted again by the air flowing through the combustion chamber, and the exhaust gas flowing into the upper control area becomes gas with a low CO ratio that has undergone considerable combustion, so even if this combustion gas is released, it does not lead to deterioration of the combustion characteristics.

(4) Since the interval between the control areas is set to 2°0% or less with respect to the inner diameter of the inner flame cylinder, the effects of 1) to 3) above can be maximized, so the combustion amount is 2,500 to 1,000 yen. cs to OOO
To obtain good exhaust gas characteristics over a wide range of
I can do it.

The above effects prevent rapid deterioration of exhaust gas characteristics during weak combustion or in oxygen-deficient conditions, thereby providing a safe combustion device with good combustion characteristics and a wide range of combustion amount adjustment.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the essential parts of a combustion device according to an embodiment of the present invention, Fig. 2 is a sectional view of the flow inside the combustion device, and Figs. 3, 4, and 5 show the effects of the device. Characteristic diagram for explanation,
FIG. 6 is a sectional view of a main part of a conventional combustion device. 1...Light wick, 6...Inner flame cylinder, 7...
Outer flame cylinder, 8... Combustion chamber, 9... Outer cylinder, 11
...Air hole, 21゜23...Restrictor tube, 2
2.24... Control area, 25° 26... Ventilation area, l... Interval between control areas, D... Inner diameter of inner flame tube. Name of agent: Patent attorney Toshio Nakao and 1 other person
'' TT 疋6-Inner flame tube 7- Ruled flame 8- DafL engineering 9- Paper simple 11...-2 air valley, 26---excessive air strike!-Kiri flow relative interval D...-inside Inner diameter of flame section 2 Figure 3! Inside 02.1, actual (/,) Figure 5 OS II 75 m Inner diameter of flame tube 1: Spacing between side flow bars to be sealed (''/,) Figure 6

Claims (1)

[Claims] an outer flame tube having a large number of air holes, an inner flame tube having a large number of air holes arranged outside the outer flame tube, an outer tube located outside the outer flame tube, and the outer flame tube. a lamp wick that is vertically movable at the lower end of the combustion chamber formed between the inner flame tubes; A plurality of flow control cylinders are provided so as to shield a control area formed between the two with their bottom surfaces, and to form a ventilation section communicating with the combustion chamber between the upper and lower sides, and the interval between the control areas is 20 for the inner diameter of the inner flame cylinder
Combustion device installed below %.