JPH01134104A - Burning apparatus - Google Patents

Abstract

PURPOSE:To improve the ignition characteristics and burning characteristics and widen adjustable range of burning intensity in a burning apparatus such as kerosene stove by disposing communicating holes in the wall of the burning control tube, the opening area of said communicating holes being greater than the sectional area of the air chamber. CONSTITUTION:The wick 1 is vertically movable between the wick inner cylinder 2 and the wick outer cylinder 3. The top end of the wick outer cylinder 3 has an inner firing tray 4 and an outer firing tray 5 on which an inner flame cylinder 6 and an outer flame cylinder 7 are respectively placed. At the time of combustion, the end of the wick 1 is exposed to the combustion chamber which is formed by the inner flame cylinder 6 and outer flame cylinder 7, where the fuel is vaporized. The heat transmitting cylinder 18 made of heat transmitting material is placed on the outer flame cylinder 9. The burning control shell 24 is disposed in the upper part inside the drilled outer cylinder 25, and they form an air chamber 26 inbetween. There are multiple communicating holes 27 uniformly distributed in the wall of the burning control shell 24 so that the air chamber 26 and combustion chamber 8 may be communicated to each other. The total opening area B of the communicating holes 27 is made greater than the section area A of the air chamber 26.

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.

2. Description of the Related Art Conventionally, as this type of combustion device, 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. 6, 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 air holes 11 of the air hole 11 and the through hole 17 of the red-hot part 16, and combustion continues, making the red-hot part 16 red-hot and obtaining radiant heat. In normal strong combustion, as shown in FIG. 6, a secondary flame f1 is formed above the inner flame tube 6 and the outer flame tube 7, and the combustion chamber 8
It shows good exhaust gas characteristics because the unburned components that have risen inside are completely combusted. However, the exposure height of wick 1 was reduced (
When the combustion amount is reduced by doing this, the flame descends into the combustion chamber 8 and is formed as shown at f2. In this case, the flame f3 formed in the air hole 11 and the through hole 17 of the inner flame cylinder 6 is replaced by the flame f3.
It is no longer formed above 2. Conventionally, under such conditions, exhaust gas characteristics, particularly Co/CO2, have deteriorated rapidly. Furthermore, if the combustion device is used for a long time in a poorly 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. It was in a similar state. The above phenomenon was confirmed as a result of measuring the exhaust gas inside the combustion equipment.
It became clear that the cause was due to the flow of

That is, the Go concentration on line AA' (air passage 20) of the combustion apparatus shown in FIG. 6 is 500 ppm or more near the upper end during strong combustion, and approximately 250 ppm during weak combustion. During strong combustion, the flame f1 burns almost completely, resulting in good exhaust gas characteristics, but
During weak combustion, these high concentrations of CO are directly released into the atmosphere. From the above, it is clear that there is diffusion from the combustion chamber 8 to the air passage 20 as shown by the broken line a, and this mixed gas containing high concentration of CO is directly released into the atmosphere, resulting in CO/CO2 Characteristics deteriorate rapidly. Therefore, the combustion amount could only be adjusted within the range where the flame f2 was formed above the combustion chamber.

A combustion device as shown in FIG. 7 has already been proposed as a solution to such problems. That is, in FIG. 7, reference numeral 24 denotes a combustion control tube, which is set at the upper part of the inner side of the outer flame tube air hole portion 25, and whose upper end extends to the vicinity of a position facing the throttle portion 15 of the outer cylinder 9, and which has a gap between it and the air hole portion 25. An air chamber 26 is formed. With the above configuration, the CO/CO2 characteristics during weak combustion could be significantly improved by locally burning the unburned gas in the air chamber 26 and reducing the amount of leakage of the unburned gas.

Problems to be Solved by the Invention However, in the above-described configuration, the air supplied to the combustion chamber is suppressed by the combustion control cylinder, so that ignition characteristics and oxygen deficiency characteristics tend to deteriorate. The present invention solves such conventional problems, and aims to provide a safe and comfortable combustion device with good combustion characteristics and a wide range of combustion amount adjustment by improving ignition characteristics and oxygen deficiency characteristics. shall be.

Means for Solving the Problems In order to solve the above problems, in the combustion device of the present invention, a communication hole is provided in the wall surface of the combustion control cylinder, and the opening area of the communication hole is made larger than the cross-sectional area of the air chamber. There is.

Effects According to the present invention, air can be efficiently supplied into the combustion chamber from the communication hole due to the above-described configuration, so that ignition characteristics and oxygen deficiency characteristics can be significantly improved.

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

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 end portions 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 a self-flame tube 6 and an outer flame tube 7 are placed thereon.

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, outer flame cylinder 7, and 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 a stoma 1 that communicates from the inside of the inner flame tube 6 to the top.
It has 3.

14 is a flame expansion plate placed on the top plate 12 of the inner flame tube. A constricted part 15 is formed at the upper end of the outer cylinder 9, and a red-hot part 16 is formed in the outer flame cylinder 7 above the constricted part 15.
A through hole 17 with a large opening is provided. 1B is a transmission tube made of a transparent material such as glass, and is placed on the outer flame tube 9. A top frame 19 is placed on the upper end of the incandescent part 16 so as to cover the upper end of the air passage 20 between the incandescent part 16 and the transmission cylinder 18, and fixes the transmission cylinder 18. 2
Reference numeral 1 denotes a flow control tube installed inside the inner flame tube 6, which extends upward from near the position facing the tip of the wick 1 to near the tip of the inner flame tube 6, and has a control area 22 formed between the inner flame tubes 6. It is provided so that it has a bottom surface. 23 is an air introduction path. 2
Reference numeral 4 denotes a combustion control tube, which is set at the inner upper part of the outer flame tube air hole portion 25, and its upper end extends to the vicinity of a position facing the throttle portion 15 of the outer flame tube 9, and an air chamber 26 is formed between it and the air hole portion 25. ing. Reference numeral 27 denotes communication holes provided in the wall of the combustion control tube 24, which are uniformly provided in large numbers so as to communicate the air chamber 26 and the combustion chamber 8. Reference numeral 28 denotes a vent hole provided in the middle lower wall surface of the flow control tube 21 . Reference numeral 29 denotes a flange portion that divides the restriction area 22 into the royal area 3o and the upper area 31 directly above the ventilation hole 28, and is formed by applying beading, flaring, etc. to make the flow restriction tube 21 protrude toward the outer circumference. are doing. Reference numeral 32 denotes a ventilation section that is set to have a constant interval between the flow control tube 21 and the inner flame tube top plate 12.

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 red-hot section 16, and combustion continues. The flow of combustion gas and air within the air passage 20 and within the combustion chamber 8 at this time will be explained with reference to FIG. Air supplied from the outside of the outer flame tube 7 is divided into flows shown by the white arrow (a), which is supplied from below the combustion control tube 24 to the vicinity of the lamp wick 1, and a flow shown by the white arrow (b), which is supplied upward. A part of the rising air passes through the air hole 11 as indicated by the white arrow (0) and is supplied to the air chamber 26.

Furthermore, the air supplied above the outer flame tube 7 is indicated by the white arrow (dl).
It is supplied to the combustion chamber 8 from the through hole 17 as shown in FIG. - On the other hand, the fuel vaporized according to the air flow white arrow (a) becomes a mixed gas with air and rises in the combustion chamber 8 as shown by the black arrow (e). The rising mixed gas tries to flow out into the air passage 2o by diffusion, but since the combustion control tube 24 is provided in the middle and upper part of the outer flame tube air hole section 25, the flow measurement effect of this combustion control tube 24 causes the black arrow to flow out. This suppresses leakage of the mixed gas into the air passage 20 as shown in (f). That is, in the absence of the combustion control tube 24, the combustion gas rises using the entire width of the combustion chamber 8, so as soon as it reaches the red-hot part 16, the combustion gas flows through the air passage 2o.
leak to. However, according to this embodiment, the flow of combustion gas is moved toward the inner flame tube 6 by the width of the air chamber 26, and leakage of combustion exhaust gas rising from below the combustion chamber 8 into the air passage 20 is suppressed. be done. Further, a certain amount of air supplied from the air hole 11 of the air hole portion 25 facing the combustion control tube 24 to the air chamber 26 as shown by the white arrow (0) is transferred to the air chamber 26.
The combustion gas is ejected from the outlet of 6 into the combustion chamber 8 and mixed with vaporized gas, where it is combusted to form a flame ft, and the combustion gas rises as shown by the black arrow (9). Therefore, a layer of this combustion gas is formed near the inner wall of the red-hot section 16, thereby suppressing leakage into the air passage 20 as indicated by the black arrow (f). black arrow (
Since the layer of flow g) rises near the red-hot part 16, some of it naturally leaks into the air passage 20 as shown by the black arrow fh), but the flow shown by the black arrow (g) is formed at the outlet of the air chamber 26. The combustion gas is in a state where combustion has progressed considerably due to the flame fi, and it contains a lot of CO2, so even if it is released into the atmosphere from the air passage 20 as shown by the black arrow, CO/CO2
does not lead to rapid deterioration.

In particular, this combustion tube has the advantage that the flow control tube 21 is provided inside the inner flame tube 6, so that the CO/CO2 characteristics are further improved.

In other words, some unburned gas is also diffused inside the inner flame tube 6, and when the amount of combustion is reduced, this unburned gas is directly discharged from the upper part of the inner flame tube 6, resulting in worsening of CO/CO2. do. In order to prevent this, the flow control tube 21 is installed to: ■ Separate the air flow and the diffused unburned gas ■ Prevent diffusion to the inside of the inner flame tube This realizes gas re-combustion and prevents deterioration of G O/CO2.

FIG. 3 shows the results of measuring CO/CO2 characteristics with respect to combustion amount for the conventional example shown in FIG. 6 and the present example. It can be seen that this example has been significantly improved.

Next, we will discuss the ignition characteristics and oxygen deficiency characteristics. Since the combustion control tube 24 is originally intended to suppress the amount of air supplied to the combustion chamber, the amount of air is insufficient during ignition and the like. To compensate for this, a communication hole 27 is provided in the combustion control tube 24, but the opening area of the communication hole 27 greatly affects the ignition characteristics and oxygen deficiency characteristics. That is, since air flows mainly upward in the combustion chamber due to thermal draft, more of the air flowing into the air chamber 26 is supplied from above than from the communication hole 27 to the combustion chamber 8 . Therefore, in order to efficiently supply air to the combustion chamber 8, the opening of the communication hole 27 needs to be enlarged to some extent. FIG. 6 shows the measurement of CO at the time of ignition with respect to the ratio B/A of the section A of the air chamber and the total opening area B of the communication holes.

Moreover, FIG. 7 shows the measured value of the CO concentration in the room when the oxygen concentration reached 15% after conducting the oxygen deficiency test.

The CO peak at the time of ignition tends to decrease as the opening area of the communication hole 27 becomes larger, but becomes almost constant when B/A>1. The oxygen deficiency characteristic increases once near a/A=0.5 (i. This is because if the opening area of the communication hole 27 is small, the communication hole 2
This is because the unburnt gas is cooled by the supplied air and the combustion reaction is suppressed, since no flame is formed in the combustion chamber 7. B/A≧
In No. 1, a flame is formed in the communication hole to make the combustion control tube 24 red-hot to promote combustion, so that the oxygen deficiency property is improved. From the results shown in FIGS. 6 and 7, B/A≧1, that is, it is necessary to make the total opening area of the communication hole 27 larger than the cross section of the air chamber 26. This allows for efficient air flow from the communication hole 27. Since air is supplied to the lower part of the combustion chamber 8, combustion is rapidly promoted, less CO1 odor is generated, and ignition characteristics and oxygen deficiency characteristics can be significantly improved.

Effects of the Invention As described above, the combustion apparatus of the present invention provides the following effects.

■ The flow measurement effect of the combustion control tube suppresses the flow of combustion gas rising from the lower part of the combustion chamber into the air passage, reducing the CO/CO
Suppress the deterioration of 2.

■ Air ejected from the air chamber to the combustion chamber promotes combustion near the inner wall of the red-hot section, forming a layer of combustion gas containing a large amount of CO2, which prevents unburned gas rising from the bottom of the combustion chamber from flowing into the air passage. and suppress the deterioration of Co/CO2.

(2) The exhaust gas layer formed near the inner wall of the red-hot part contains a large amount of CO2, so even if it flows into the air passage and is released from the upper part of the red-hot part, it will not lead to deterioration of the CO/CO2 characteristics.

■ By making the opening area of the communication hole larger than the cross-sectional area of the air chamber, the efficiency is increased (air is supplied from the communication hole to the combustion chamber and combustion is promoted).

The above effects prevent rapid deterioration of exhaust gas characteristics during weak combustion or in oxygen-deficient conditions, and improve ignition characteristics, resulting in safe and comfortable combustion with good combustion characteristics and a wide range of combustion amount adjustment. You can get the equipment.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of the main parts of a combustion device according to an embodiment of the present invention, Fig. 2 is a cross-sectional view of the flow inside the combustion device, and Figs. 3, 4, and 5 are effects of the combustion device. Fig. 6 is a sectional view of the main part of a combustion device showing a conventional example, Fig. 7 is a characteristic diagram for explaining the
The figure is a sectional view of a main part of another conventional combustion device. 1...Light wick, 6...Inner flame cylinder, 7...
...Outer flame tube, 8... Combustion chamber, 9...
Outer cylinder, 11・mountain・air hole, 18・・・・transmission cylinder,
24... Combustion control tube, 25... Air hole portion, 26... Air chamber, 27... Communication hole. Name of agent: Patent attorney Toshio Nakao and 1 other person/-
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Claims (1)

[Claims] an outer flame tube consisting of a pore section having a large number of air holes and a red-hot section formed above the pore section, an inner flame tube having a large number of air holes disposed inside the outer flame tube, and the outer flame tube. an outer cylinder located outwardly, a transmission cylinder placed above the outer cylinder, and a fuel supply unit configured to be vertically movable at a lower end of a combustion chamber formed between the outer flame cylinder and the inner flame cylinder. a combustion control tube disposed above the inner side of the pore portion of the outer flame tube and forming an air chamber between the pore portion and a communication hole provided in a wall surface of the combustion control tube; The opening area of the combustion device is larger than the cross-sectional area of the air chamber.