JPH0670482B2 - Combustion device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion device used for household heating or the like.

2. Description of the Related Art Conventionally, as a combustion device of this kind, there is a suction vaporization type combustion device used in an oil stove or the like, which is an inner flame tube 6 having a large number of air holes 11 as shown in FIG.
The tip of the wick 1 is exposed in the combustion chamber 8 formed between the outer flame cylinder 7 and the outer flame cylinder 7 to vaporize and burn the fuel. Normally, the outer flame cylinder 7 forms a red heat portion 16 having a through hole 17 having a large opening area above the throttle portion 15 of the outer cylinder 9, and the fuel vaporized from the wick 1 and the through hole 17 into the combustion chamber 8 The radiant heat was obtained by mixing and burning the air introduced to the red heat section 16 to make it red heat.

Problems to be Solved by the Invention However, the above-described configuration causes the following problems.

In normal strong combustion, as shown in FIG. 5, a secondary flame f ₁ is formed above the inner flame cylinder 6 and the outer flame cylinder 7, and the unburned components rising in the combustion chamber 8 are completely burned. Shows good exhaust gas characteristics. However, when the exposed height of the wick 1 is reduced to reduce the amount of combustion, the flame drops into the combustion chamber 8 and is formed like f ₂ . In this case, the flame f ₃ which has been formed air holes 11 and holes 17 of the inner flame tube 6 will not be formed above the flame f _2. Conventionally, in such a state, exhaust gas characteristics, especially CO
/ CO ₂ was deteriorating sharply. Also, when the combustion device is used for a long time in a well-sealed room, the combustion amount gradually decreases as the oxygen concentration decreases, but as described above, a large amount of CO is generated when the flame falls into the combustion chamber 8. It was in a bad state. The above phenomenon is the result of measuring the exhaust gas in the combustion device. It was revealed that the main cause is the flow inside the inner flame cylinder 6. That is, the position of line AA 'in FIG.
The CO concentration was 1000 ppm or more near the upper end when the combustion was weak (the state where the flame was f ₂ and went down into the combustion chamber 8). From this, it is clear that a flow leaking from the combustion chamber 8 into the inner flame cylinder 6 exists inside the inner flame cylinder 6 as indicated by the wavy line a. 13 or flame
The CO / CO ₂ characteristics are rapidly deteriorated because they are directly emitted into the atmosphere through the air holes 11 above f ₂ . This phenomenon is the same even when the oxygen concentration is reduced (oxygen deficient state) by burning for a long time in a well-sealed room.

The present invention solves such a conventional problem, by preventing a sharp deterioration of the exhaust gas characteristics during weak combustion or in an oxygen-deficient state, good combustion characteristics, a large combustion amount adjustment range, and safe combustion The purpose is to obtain the device.

Means for Solving the Problems In order to solve the above-mentioned problems, in the combustion apparatus of the present invention, the inner flame cylinder is disposed inside the inner flame cylinder and is located above the position facing the fuel supply portion. A control pipe having a plate portion laterally provided at the bottom of the control flow region formed between the control flow control region and the control flow control region is provided, and a communication hole communicating with the control flow control region is provided on the wall surface of the control flow channel, and further above this communication hole. A plate part is provided to divide the restricted area into upper and lower parts.

Effect The present invention, by the above-mentioned configuration, introduces unburned gas into the control region, and while mixing this unburned gas with the clean air supplied above the control cylinder, the unburned gas is concentrated from the upper end of the inner flame cylinder. It is supplied to the combustion chamber to promote combustion. In addition, a communication hole is provided on the wall of the flow control cylinder, and a plate portion that divides the flow control region into upper and lower parts is provided above the communication hole, so that combustion gas that flows into the flow control cylinder above the flame will burn considerably. It becomes a gas in this state, and it is possible to prevent a large amount of CO from being released.

Embodiments Embodiments of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, reference numeral 1 designates a wick which is a fuel supply portion, and a wick inside 2
It is set to be vertically movable between the outer core tube 3 and the outer core tube 3. The upper ends of the inner core tube 2 and the outer core tube 3 respectively form an inner fire tray 4 and an outer fire tray 5, on which an inner flame barrel 6 and an outer flame barrel 7 are placed.
The tip of the wick 1 is exposed to the inside of the combustion chamber 8 formed between the inner flame cylinder 6 and the outer flame cylinder 7 in the combustion chamber, 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 sequentially arranged from the inside in a substantially concentric shape and are integrated by a fixing pin 10. Reference numeral 11 denotes air holes provided in the inner flame cylinder 6 and the outer flame cylinder 7. Reference numeral 12 denotes an inner flame cylinder top plate that closes the upper end opening of the inner flame cylinder 6, and a ventilation hole that communicates from the inside of the inner flame cylinder 6 to the upper side.
Have 13. Reference numeral 14 is a flame spreading plate placed on the inner flame cylinder top plate 12. A throttle portion 15 is formed at the upper end of the outer flame cylinder 9, and a red heat portion 16 is formed in the outer flame cylinder 7 above the throttle portion 15 and a through hole 17 having a large opening is provided. Reference numeral 18 denotes a transparent cylinder made of a transparent material such as glass, which is placed on the outer flame cylinder 9. 19 is a top frame, the red heat part 16 and the transparent tube
It is placed on the upper end of the red heat section 16 so as to shield the upper end of the air passage 20 between the 18 and fixes the transmission tube 18. Reference numeral 21 denotes a flow restricting cylinder placed inside the inner flame cylinder 6, which is located above the position facing the wick 1 and is laterally provided at the bottom of a restriction flow region 22 formed between the inner flame cylinder 6 and the inner flame cylinder 6. A plate portion 21a is provided. 23 is a control pipe 2
1 It is a communication hole provided on the middle and lower wall surfaces. 24 is a communication hole 23
It is a plate part that divides the restricted area 22 directly above (lowered area A22) and above (limited area B25). Reference numeral 26 is a ventilation part that is set so as to have a constant space between the flow restricting cylinder 21 and the inner flame cylinder top plate 12. 27 is an air introduction path. In the above configuration, the wick 1
Starts combustion when ignited, and a high temperature combustion gas due to combustion rises in the combustion chamber 8 to generate a heat draft, and air required for combustion is generated by the air holes 11 of the inner flame cylinder 6, the outer flame cylinder 7 and the red heat part. It is supplied into the combustion chamber 8 through 16 through holes 17 and combustion is continued. The flow of combustion gas and air in the inner flame cylinder 6 and the combustion chamber 8 at this time will be described with reference to FIG. The air supplied from the inside of the inner flame cylinder 6 is supplied from the lower side of the flow restricting cylinder 21 to the vicinity of the wick 1 and the white arrow b rising from the air introduction path 27.
It is divided into the flow of. Part of the rising air passes through the communication hole 23 as shown 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 from the air holes 11 and the air holes 13 to the combustion chamber 8 and above it as shown by the white arrow d. Further, as shown by a part of the white arrow e, it descends to the restricted region B25 and is also supplied to the combustion chamber 8 from the air holes 11 located relatively below. On the other hand, the fuel vaporized by the air flow white arrow a becomes a mixed gas with the air and mainly rises in the combustion chamber 8 as shown by the black arrow f. However, the air flow white arrows c and d, e
Because the restricted area A22 and restricted area B25 become negative pressure,
A part of the mixed gas flows into the restricted areas A22 and B25 as indicated by black arrows g and h. Therefore, restricted area A22, restricted area B25
Is filled with unburned gas. This unburned gas is mixed with the air flow white arrow c and the air flow white arrows d and e in the communication hole 23 and the ventilation portion 26, and is again supplied to the combustion chamber 8 as indicated by black arrows i and j. Therefore, at the time of strong combustion, unburned gas and air are mixed well from near the upper end of the inner flame cylinder 6 and are supplied to near the upper end of the combustion chamber 8, so that they are efficiently burned near the region c, and the unburned gas that could not be burned up further here. The gas is burned in the fire fr formed above. Next, when the exposed height of the wick 1 is reduced to reduce the combustion amount, the flame gradually descends into the combustion chamber 8 and becomes the flame fs. The flow in this case is similar to that in the case of strong combustion, but the amount of vaporized gas is greatly reduced, so the amount of unburned gas flowing into the restricted region B25 is also reduced. Therefore, the mixing area with the air flow white arrow e is lowered downward, and the vicinity of the area D is a good mixing area, and flame holding is formed in this part, the wall surface of the inner flame tube 6 is red-heated, and further formed above it. Flame fs
To complete the combustion. In this case, most of the unburned gas that has flowed into the restricted flow area B25 is supplied into the combustion chamber 8 by the air flow white arrows d and e and burned in the flame fs. Therefore, in the restricted flow area B25 facing above the flame fs, There are almost no unburned gas components, the air discharged from the air holes 11 and the ventilation holes 13 above the flame fs is clean, and the exhaust gas characteristics (CO / SO ₂ ) do not deteriorate. By the way, it was found that the CO concentration in the vicinity of the vent hole 26 was about 30 to 50 ppm, which was significantly lower than that of the conventional example. However, when the amount of combustion is further reduced and the flame is further lowered, the temperature above the inner flame cylinder 6 is lowered, so that combustion is performed despite sufficient supply of air into the restriction region B25 by the air flow white arrow e. Since it is not promoted, the air discharged from above the flame fs will gradually contain a large amount of CO components, and the exhaust gas characteristics will gradually deteriorate. However, when the combustion amount is further reduced and the flame is formed below the plate portion 24 like fm, the temperature near the flame fm is high and the communication hole 23
Since sufficient air is supplied from the air flow arrow c, combustion is promoted in the vicinity of the area E. In this case, control area B25
Although the exhaust gas also flows into the exhaust gas component, this exhaust gas component is in a state where combustion has progressed considerably in the flame fm, and the CO ratio in the exhaust gas component does not become so high. Therefore, the exhaust gas characteristics do not deteriorate.

Further, the plate portions 21a and 24 allow unburned gas to flow from the combustion chamber 8 to the flow control cylinder.
It is also possible to suppress merging with the air flow flowing upward through the air introduction passage 27 surrounded by the flow control cylinder 21 via the lower end of 21 and the communication hole 23.

That is, even if a gap or the like is formed in the plate portion due to assembly or the like, the amount of unburned gas leaking from this is limited, so that the flow of unburned gas can be reduced accordingly.

Further, since the pressure in the restricted flow area A22 and the restricted flow area B25 is lowered by the draft action of the combustion chamber 8, when the air flow flowing upward in the air introduction passage 27 reaches the communication hole 23 and the upper end of the restriction cylinder 21, it is suddenly restricted. Turn to the direction of the basin A22, the control basin B25, join the unburned gas rising in the basin A22, the control basin B25,
Helps to flow into the combustion chamber 8.

The case where the exposed height of the wick 1 is decreased in the normal combustion to reduce the amount of combustion has been described above, but the same effect can be obtained even when the wick 1 is burned for a long time in a well-sealed room. That is, in the oxygen-deficient state, the amount of combustion decreases as the oxygen concentration decreases, and a phenomenon similar to the case where the exposed height of the wick 1 is decreased to decrease the amount of combustion is observed. The defect characteristics are also improved.

Fig. 3 shows the CO vs. combustion amount for the conventional example and this example.
/ CO ₂ characteristics, and FIG. 4 shows the result of measurement of oxygen deficiency characteristics. The oxygen deficiency property was measured at an initial combustion amount of about 1250 Kcal / hr. In this example, the CO / CO ₂ characteristic and the oxygen deficiency characteristic were greatly improved, and the effect of the present invention is clear.

In the above embodiments, the case where the communication hole and the plate portion are provided at one place has been described, but even if the configuration has two or more places, the same or higher effect can be obtained.

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

Since a flow restricting cylinder is provided inside the inner flame cylinder, unburned gas containing high concentration of CO flows into the restrictive flow area by the air flow rising in the air introduction path, but by the air supplied to the ventilation part As a result of being mixed, a good mixed state can be formed at a certain height position of the inner flame cylinder according to the amount of combustion, and combustion can be promoted.

The flow of unburned gas leaking into the inner flame cylinder is blocked by the air supplied from the ventilation part. Due to this shielding effect, the uncontrolled gas in the restricted area above the flame and the air introduction path contains almost no unburned gas, and high-concentration CO is released directly into the atmosphere from the inner flame cylinder air holes and vent holes above the flame. There is no such thing.

A plate that divides the flow control region into upper and lower parts is provided above the ventilation part that connects the inside of the flow control region and the inside of the flow control cylinder, so when the flame falls below the plate part, it is efficiently supplied from the ventilation part below it. Combustion is promoted again by the generated air, and the exhaust gas flowing into the upper control area becomes a gas with a considerably low combustion rate of CO, so even if this combustion gas is released, the combustion characteristics are not deteriorated.

Due to the above effects, it is possible to obtain a safe combustion device having good combustion characteristics, a wide range of adjustment of the combustion amount, and preventing a rapid deterioration of exhaust gas characteristics even during weak combustion or in an oxygen-deficient state.

[Brief description of drawings]

FIG. 1 is a sectional view of a main part of a combustion apparatus in one embodiment of the present invention, FIG. 2 is a sectional view of the flow in the combustion apparatus, and FIGS. 3 and 4 are for explaining the effect of the apparatus. FIG. 5 is a sectional view of a main part of a conventional combustion device. 1 ... wick, 6 ... inner flame cylinder, 7 ... outer flame cylinder, 8 ... combustion chamber, 9 ... outer flame cylinder, 11 ... air hole, 21 ... restrictor cylinder, 22,2
5 …… Restricted area, 23 …… Communication hole (ventilation part), 24 …… Plate part.

Claims (1)

[Claims] 1. An outer flame cylinder having a large number of air holes, an inner flame cylinder having a large number of air holes arranged inside the outer flame cylinder, and an outer cylinder positioned outside the outer flame cylinder. And a fuel supply section that is set at the lower end of the combustion chamber formed between the outer flame cylinder and the inner flame cylinder, and above the position that is arranged inside the inner flame cylinder and that faces the fuel supply section. A flow restricting cylinder having a plate portion laterally provided at the bottom of the flow restricting area formed between the inner flame cylinder and the inner flame cylinder, and a ventilation part that communicates the inside of the restricting cylinder with the flow restricting area, A combustion device including a plate part that divides the restricted region into upper and lower parts above the ventilation part.