JPH0672682B2 - 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 this type of combustion apparatus, there is a suction vaporization type combustion apparatus used in oil stoves and the like, but as shown in FIG. 5, this is an internal flame having a large number of air holes 11. The tip of the wick 1 is exposed in the combustion chamber 8 formed between the cylinder 6 and the outer flame cylinder 7 to vaporize and burn the fuel. Normal outer flame cylinder 7
Is a through hole having a large opening area above the narrowed portion 15 of the outer cylinder 9.
The red-heated portion 16 having 17 is formed, and the fuel vaporized from the wick 1 is burned in the combustion chamber 8 to red-heat the red-heated portion 16 to obtain radiant heat.

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

In normal strong combustion, as shown in FIG. 5, the inner flame cylinder 6 and the outer flame cylinder 7
Since the secondary flame f ₁ is formed above and the unburned components rising in the combustion chamber 8 are completely burned, excellent exhaust gas characteristics are exhibited. However, when the exposed height of the wick 1 is reduced and the amount of combustion is reduced, the flame falls 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
The characteristics deteriorated sharply. It has become clear that this is due to the flow of combustion gas and air as shown below.

FIG. 6 is a line AA ′ of the conventional combustion device of FIG. 5, that is, the air passage 2 between the outer cylinder 9 or the permeation cylinder 18 and the outer flame cylinder 7.
0) and the BB ′ line (that is, the inside of the inner flame cylinder 6) at the positions where CO distribution in the height direction was measured during strong and weak combustion. At the position A-A ', the CO concentration sharply increases above the throttle portion 15 of the outer cylinder 9 during strong combustion, reaches the maximum in the middle upper part, and decreases again near the upper end, but shows a high value of 500 ppm or more. However, during strong combustion, the flame f _{1 is used} for almost complete combustion, so the exhaust gas characteristics are good. The same behavior is exhibited even during weak combustion, and CO
The concentration is about 250 ppm near the upper end, but in this case, since the flame becomes f ₂ and drops downward, CO is released directly into the atmosphere from the through hole 17 near the upper end of the red heat section 16. . At the position of the line BB ', the same behavior is exhibited both during strong combustion and during weak combustion, and at the upper end, a very high value of 1000 ppm or more is exhibited even during weak combustion, which is directly emitted into the atmosphere.

From the above results, the flow of air and combustion gas in the combustion device is as follows. That is, as shown in FIG. 5, there is a main flow indicated by a black arrow and a flow indicated by a broken arrow. That is, the combustion gas in the incomplete combustion state is converted into the combustion chamber 8
Flow a from the combustion chamber 8 to the inside of the inner flame tube 6 and flow b from the combustion chamber 8 to the air passage 20. Therefore, if the flame at the time of weak combustion falls into the combustion chamber 8 like f ₂ and the flame is not formed thereabove, from the air hole 11 and the vent hole 13 at the upper part of the inner flame tube 6 and from the red heat part 16 Combustion gas containing high-concentration CO is directly discharged into the atmosphere through the upper through hole 17. As described above, the rapid deterioration of CO / CO ₂ at the time of weak combustion is due to the high concentration of the leaked gas inside the inner flame tube 6 and the air passage 20.
It was clarified that this is because the combustion gas containing CO was released directly into the atmosphere.

As described above, in order to prevent the deterioration of the exhaust gas characteristics when the combustion amount is reduced, conventionally, from the lower part of the outer flame cylinder 7 to the combustion chamber 8
Although a method of relatively suppressing the amount of air supplied to the inside has been taken, in this case, since the amount of air from the lower portion of the outer flame cylinder 7 into the combustion chamber 8 is reduced, the ignition characteristic is deteriorated. However, there is a problem that a yellow fire is generated in the combustion chamber 8. Further, in such a method, if the flame finally falls into the combustion chamber, the exhaust gas characteristics deteriorate, and it is not a fundamental measure.

The present invention solves such a conventional problem, suppresses the rapid deterioration of the combustion characteristics during weak combustion, improves the exhaust gas characteristics and increases the combustion amount adjustment range, and also improves the ignition characteristics, the combustion state, and the like. The purpose is to obtain a stable combustion 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 flow restricting cylinder that forms a flow restricting area between the heat restricting cylinder and the inner flame cylinder, and a plate portion laterally installed in the flow restricting area between the heat restricting cylinder and the inner flame cylinder, and inside the pore of the outer flame cylinder, A combustion control cylinder is provided that extends from above the fuel supply section to a position below the red heat section of the outer flame cylinder and forms an air chamber between the outer flame cylinder and the pores of the outer flame cylinder.
The wall surface of the combustion control cylinder is provided with a communication hole that communicates with the combustion chamber from the air chamber.

Effect The present invention has the above-described structure, introduces unburned gas into the control flow area, mixes the unburned gas with the clean air supplied above the control flow tube, and the inner flame tube air hole near the upper end of the control flow tube. It is possible to intensively supply the gas from the inside to the combustion chamber for combustion and to keep the inside of the upper end of the inner flame cylinder in a clean state with a small amount of unburned gas components. Further, it is possible to supply air into the combustion chamber through the communication hole provided in the combustion control cylinder wall, change the flow in the combustion chamber, and improve the combustion gas composition in the air passage.

Embodiment One embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, reference numeral 1 denotes a wick which is a fuel supply unit and an inner core tube 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.
At the time of combustion, the tip of the wick 1 is exposed in the combustion chamber 8 formed between the inner flame cylinder 6 and the outer flame cylinder 7, and the fuel is vaporized there. Reference numeral 9 denotes an outer cylinder. 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 has a vent hole 13 that communicates upward from the inside of the inner-flame cylinder 6. Reference numeral 14 is a flame spreading plate placed on the inner flame cylinder top plate 12. A red heat section 16 is formed in the outer flame tube 7 above the throttle section 15 of the outer tube 9, and a through hole 17 having a large opening is provided. A transparent cylinder 18 made of a transparent material such as glass is placed on the outer cylinder 9. 19 is the top frame and the red heat part 16
The transmission tube 18 is mounted on the upper end of the red heat section 16 so as to shield the upper end of the air passage 20 between the transmission tube 18 and the transmission tube 18. Reference numeral 21 denotes a flow restricting cylinder installed inside the inner flame cylinder 6, which is located above the position facing the wick 1 and forms a restriction flow region 22 with the inner flame cylinder 6. And the flow control area between the flow control cylinder 21 and the inner flame cylinder 6
A plate portion 21a provided horizontally on 22 is provided. 23 is an air introduction path. Reference numeral 24 denotes a combustion control tube set inside the pores 25 of the outer flame tube 7 below the red heat section 16 of the outer flame tube 7, from a position near the upper side of the wick 1 to a position below the red heat section 16 of the outer flame tube 7. Extended,
The air chamber so that there is a gap between it and the pores 25 of the outer flame cylinder 7.
26 are formed. Reference numeral 27 denotes a communication hole provided on the wall surface of the combustion control cylinder, and a large number of communication holes 27 are uniformly provided so as to connect the air chamber 26 and the combustion chamber 8.

In the above configuration, when the wick 1 is ignited, combustion starts,
A high temperature combustion gas generated by combustion rises in the combustion chamber 8 to generate a thermal draft, and the air required for combustion is generated in the inner flame cylinder 6,
The combustion is continued by being supplied into the combustion chamber 8 through the air holes 11 of the outer flame cylinder 7 and the through holes 17 of the red heat section 16, and during strong combustion, a flame fr is formed as shown in FIG. The flow of combustion exhaust gas and air at this time will be described with reference to FIG. The air supplied from the inner side of the inner flame cylinder 6 is divided into a white arrow a supplied from below the control cylinder 21 to the vicinity of the wick 1 and a white arrow b rising in the air introduction path 23. The white arrow b reaches the upper side of the inner flame cylinder and is supplied to the combustion chamber 8 and the upper side thereof through the air holes 11 and the vent holes 13 as shown by the white arrow c. Further, a part thereof descends to the restricted region 22 as indicated by a white arrow d, 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 white arrow a becomes a mixed gas with air and mainly rises in the combustion chamber 8 as shown by the black arrow e. However, since the air flow white arrows c and d cause a negative pressure in the air flow control area, a part of the mixed gas is in the air flow control area 22 as indicated by a black arrow f.
It flows in and rises. Therefore, the uncontrolled gas fills the restricted area 22. This unburned gas rises in the flow control region 22, is mixed with the air flow white arrows c and d as shown by the black arrow g in the vicinity of the upper end of the flow control cylinder 21, and is supplied from the air hole 11 to the combustion chamber 8. Therefore, at the time of strong combustion, unburned gas and air are mixed well near the upper end of the inner flame cylinder 8 and supplied to the vicinity of the upper end of the combustion chamber 8, so that the combustion is efficiently performed in the vicinity of the area A, and the combustion cannot be completed here. The fuel gas is burned by the flame fr formed above. Next, when the exposed height of the wick 1 is lowered to make the combustion weak, the flame gradually falls into the combustion chamber 8 and becomes the flame fs. The flow in this case is similar to that in the strong combustion, but the amount of vaporized gas is greatly reduced, so that the amount of unburned gas flowing into the restricted region 22 is also reduced. Therefore, the mixing area with the air flow white arrow d is lowered downward, and the vicinity of the area B becomes a good mixing area, and flame holding is formed in this part, and the wall surface of the inner flame tube 6 is red-heated to promote combustion. , And the combustion is completed by the flame fs formed thereabove. Therefore, air containing almost no unburned components is discharged from the air holes 11 above the flame fs. Also, the plate part
Due to 21a, it is also possible to suppress unburned gas from merging with the air flow flowing upward from the combustion chamber 8 through the lower end of the flow restricting cylinder 21 and the air introduction path 23 surrounded by the restricting cylinder 21.

Further, since the pressure in the restriction region 22 is lowered by the draft action of the combustion chamber 8, when the air flow flowing upward in the air introduction path 23 reaches the upper end of the restriction cylinder 21, it suddenly changes its direction toward the restriction region 22. It merges with the rising unburned gas in this restricted region 22 and promotes the flow into the combustion chamber 8. Next, look at the flow on the side of the outer flame cylinder 7. When the combustion control tube 24 is not provided as in the conventional example, the combustion gas rises using the entire width of the combustion chamber 8 and therefore, when it reaches the red heat section 16, it immediately leaks to the air passage 20. However, in the present embodiment, since the combustion control cylinder 24 is present, the flow of the combustion gas is directed toward the inner flame cylinder 6 side by the width of the air chamber 26, and the combustion exhaust gas rising from below the combustion chamber 8 is discharged. Leakage to the air passage 20 is suppressed. In addition, the combustion control cylinder 24
A certain amount of air supplied from the air hole 11 of the outer flame cylinder pore portion 25 facing the air chamber 26 to the air chamber 26 as shown by the white arrow h is ejected from the outlet of the air chamber 23 into the combustion chamber 8 to generate vaporized gas. As they are mixed, they burn here, forming a flame ft, and the combustion gas rises as shown by the black arrow h. Therefore, a layer of this combustion gas is formed in the vicinity of the inner wall of the red heat section 16, and the leakage of unburned gas rising from below the combustion chamber 8 to the air passage 20 is suppressed. Since the flow layer of the black arrow h rises in the vicinity of the red heat section 16, the leakage to the air passage 20 naturally occurs like the black arrow i, but the black arrow i
Is a combustion gas in a state where combustion is considerably advanced by the flame ft formed at the outlet of the air chamber 23, and contains a large amount of CO ₂ , and even if it is released from the air passage 20 to the atmosphere, CO / C
It does not lead to a sharp deterioration of O ₂ . Combustion control cylinder 24
Since the communication hole 27 that connects the air chamber 26 and the combustion chamber 8 is provided on the wall surface, air is supplied as shown by the white arrow j, and mixing with the combustion gas flow bent by the combustion control cylinder 24 is good. Becomes
Little yellow fire is generated in the combustion chamber 8. Further, in the conventional example, in order to improve the exhaust gas characteristics at the time of weak combustion, the outer flame cylinder pores 25
Although a method of suppressing the amount of air supplied from the inside to the combustion chamber 8 to prevent the flame from falling has been adopted, in this case,
Since the air introduced into the combustion chamber 8 from the outer flame cylinder pore portion 25 is suppressed, the air supply becomes insufficient at the time of ignition, and CO and odor may be generated. When the combustion control cylinder 24 is not provided with the communication hole 27, a similar phenomenon may occur.However, in the present embodiment, since the communication hole 27 is provided on the wall surface of the combustion control cylinder 24, the supply of air is sufficient. As a result, the ignition characteristics are improved, and the amount of CO generated is reduced to about 1/2.

FIG. 3 is a line AA '(air passage) of the embodiment in FIG.
20), the C-C 'line (inside the restricted area 22) and the D-D' line (air introduction path 23) at the positions of CO and CO ₂ concentration distributions measured during weak combustion. For comparison, the conventional example A-
The values at the A'line position are also shown. At the position of the line AA ′, the CO value was almost the same as that of the conventional example, but the CO ₂ example of the present invention showed a considerably high value for CO ₂ , which does not lead to deterioration of CO / CO ₂ characteristics. Consistent with the above description. At the C-C 'line position, a very high concentration of CO is detected from the lower end of the flow restricting cylinder 21, but it gradually becomes thinner near the upper end of the flow restricting cylinder 21, and is considerably diluted at the upper end of the inner flame cylinder 6. It can be seen that the upper part of the inner flame cylinder 6 is in a clean state with low CO concentration. At the DD ′ line position inside the flow control cylinder 21, the entire area is
It can be seen that the CO concentration is low and clean air is supplied. The above results are also consistent with the above description.

FIG. 4 shows the results of measuring the combustion amount-CO / CO ₂ characteristics of this example and the conventional example. In the conventional example (broken line), the CO / CO ₂ value sharply rises as the combustion amount decreases, and the exhaust gas characteristics deteriorate. However, in this example (example), the CO / CO ₂ value decreases even if the combustion amount decreases. CO ₂ shows a low value, the characteristics are significantly improved, and the effect of the present invention is clear.

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

(1) By installing a flow restrictor, the clean air in the air inlet is separated from the combustion gas introduced into the restrictive zone, and it is possible to supply clean air above the inner flame cylinder. CO ₂ properties are improved.

(2) In the vicinity of the upper end of the flow control cylinder, a high concentration of CO is included in order to promote combustion by forming a good mixed state of combustion gas and air at a certain height position of the inner flame cylinder according to the amount of combustion. Combustion gas does not flow out, and CO / CO ₂ characteristics can be reduced.

(3) The clean air flow supplied from the air introduction path to the upper side of the inner flame cylinder blocks the flow of combustion gas to the upper side of the inner flame cylinder, and due to this shielding effect, the upper part of the inner flame cylinder contains almost all combustion gas. Even if the flame during weak combustion falls into the combustion chamber, high-concentration CO is not released directly to the atmosphere, and CO / CO ₂ can be reduced.

(4) Since the combustion load in the combustion chamber is reduced by the combustion control cylinder, the flame drop during weak combustion is suppressed, and the combustion gas released from the air passage to the atmosphere through the red heat section is suppressed. / CO ₂ can be reduced.

(5) The flow control effect of the combustion control cylinder suppresses the outflow of the combustion gas rising from the lower part of the combustion chamber into the air passage, and suppresses the deterioration of CO / CO ₂ .

(6) Combustion is promoted by the air ejected from the air chamber to the combustion chamber in the vicinity of the inner wall of the red heat section to form a combustion gas layer containing a large amount of CO ₂ , so that the outflow from the lower part of the combustion chamber to the unburned gas air passage rising. Suppress the deterioration of CO / CO ₂ .

(7) Since the exhaust gas layer formed near the inner wall of the red heat section contains a large amount of CO ₂ , even if it flows out into the air passage and is released from the upper part of the red heat section into the atmosphere, the CO / CO ₂ characteristics will rapidly deteriorate. it dose not connect.

(8) Since the combustion control cylinder wall surface has a communication hole that communicates the air chamber and the combustion chamber, the air supplied from the communication hole into the combustion chamber promotes good mixing and promotes combustion. There is no yellow fire.

(9) Since the air is supplied from the communication hole into the combustion chamber, the ignition characteristic becomes good.

With the above effects, it is possible to improve the exhaust gas characteristics during weak combustion, increase the combustion amount adjustment range, and obtain a combustion device with good ignition characteristics, combustion conditions, and the like.

[Brief description of drawings]

FIG. 1 is a sectional view of a main part of a combustion apparatus according to an embodiment of the present invention, FIG. 2 is a sectional view of a flow in the combustion apparatus, and FIGS. 3 and 4 are for explaining effects of the combustion apparatus. Characteristic diagram of No.5
FIG. 6 is a sectional view of a main part of a conventional combustion device, and FIG. 6 is a characteristic diagram of the conventional combustion device. 1 ... wick, 6 ... inner flame cylinder, 7 ... outer flame cylinder, 8 ... combustion chamber, 9 ... outer cylinder, 15 ... outer cylinder throttle, 21 ... flow restricting cylinder, 21
a …… Plate part, 22 …… Restricted area, 24 …… Combustion control tube, 26 ……
Air chamber, 27 ... Communication hole.

Claims (1)

[Claims] Claim: What is claimed is: 1. An outer flame cylinder comprising a pore portion having a large number of air holes and a red heat portion formed above the pore, and an inner flame cylinder having a large number of air holes arranged inside the outer flame cylinder. An outer cylinder arranged outside the outer flame cylinder, a fuel supply unit set at the lower end of the combustion chamber formed between the outer flame cylinder and the inner flame cylinder,
A flow restricting cylinder that is disposed inside the inner flame cylinder, is located above a position facing the fuel supply unit, and forms a restriction flow region between the inner flame cylinder and the inner flame cylinder; A plate portion laterally provided in a restricted region between the flame tube and the inside of the pore of the outer flame tube, from near the upper portion of the fuel supply section to a position below the red heat section of the outer flame tube. A combustion control cylinder that extends and forms an air chamber between the outer flame cylinder and a pore portion, and a communication hole that is provided on a wall surface of the combustion control cylinder so as to communicate with the combustion chamber from the air chamber. Combustion equipment.