JPH01139908A - Combustor - Google Patents

Abstract

PURPOSE:To prevent the deterioration of waste gas characteristics, improve combustion characteristics and widen an adjustable range of combustion by providing a flow control cylinder having a nearly covered bottom within an inner flame cylinder and disposing a second throttle part above a first throttle part of an outer cylinder. CONSTITUTION:As the height of the exposed part of a wick 1 is decreased so as to reduce a combustion rate, the flame becomes gradually smaller in the combustion chamber 8, and the amount of unburnt fuel gas flowing into control zones 25a, 25b, 25c is also reduced. The unburnt fuel gas is obstructed to flow above the flame FL by the air supplied from an air hole 27 and an air passage 29. Because of the obstruction effect, the air emitted from air holes 11 and an opening 13 in the inner flame cylinder above the flame is clean. The unburnt fuel gas flowing into a circulation zone 20 is also introduced into a combustion chamber 8 by a second throttle part 19, and almost of the gas is burnt with the flame FL. Therefore, little unburnt gas flows through an air passage 23, and the air discharged from through-holes 16 of the outer flame cylinder 7 is relatively clean.

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Application The present invention relates to a combustion device used for home heating and the like.

BACKGROUND OF THE INVENTION Conventionally, combustion devices in this column include suction vaporization type combustion devices used in kerosene stoves and the like. As shown in FIG.
The wick 5, which is a fuel supply section, is placed in the combustion chamber 63 between the outer flame tube 52 and the outer flame tube 52.
4 The tip is exposed to vaporize and burn the fuel. Normally, the outer flame cylinder 52 is connected to the constricted part 55 of the outer cylinder 55.
Above m, there is a red-hot part 5 having a through hole with a large opening area.
6, the fuel vaporized from the lamp wick 64 and the air introduced into the combustion chamber 53 through the through hole were mixed and combusted, causing the red-hot part 66 to become red-hot and obtain radiated heat.

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

In other words, in normal strong combustion, the inner flame cylinder 51
A secondary flame f1 is formed above between the combustion chamber 53 and the outer flame cylinder 52, and the unburned gas components rising in the combustion chamber 53 are completely combusted, so that good characteristics are exhibited. However, when the exposed height of the lamp wick 54 is lowered to reduce the amount of combustion, the flame descends into the combustion chamber 5a and is formed as shown at f2. The flow of air and unburned gas within the combustion device at this time is as follows. In other words, in Fig. 4, the solid arrow indicates the flow of air,
Broken line arrows indicate the flow of unburned gas, and unburned gas in an incompletely combusted state flows into a flow 58 leaking from the combustion chamber 53 to the air passage 57 outside the outer flame 52, and from the combustion chamber 53 to the inner flame tube 51.
This creates an inward ronin flow 59. During weak combustion, the flame falls into the combustion chamber 53 as shown at t2, and since no flame is formed above it, the unburned gas 58,59 leaking out from the combustion chamber 6a is caused by the flame f2. The unburnt gas containing a high concentration of co2 is not completely combusted, and is directly released into the atmosphere through the through hole of the red-hot part 56 above the outer flame tube 52, the air hole 50- and the ventilation section 60 at the upper part of the inner flame tube 51. will be released. Therefore, during weak combustion, the exhaust gas characteristics (c
o/co2) deteriorated, which made it impossible to widen the combustion amount adjustment range.

The present invention has been made in view of these points, and it prevents high concentration of CO from being directly released into the atmosphere during weak combustion, suppresses rapid deterioration of exhaust gas characteristics, and improves combustion characteristics. The purpose of this invention is to obtain a combustion device with a large combustion amount adjustment range.

Means for Solving the Problems In order to solve the above problems, in the combustion device of the present invention, the inner flame tube extends inward from the vicinity of the position facing the lamp wick to the vicinity of the upper end of the inner flame tube. A flow control cylinder is provided that substantially shields the control area formed between the outer cylinder and the bottom surface of the flow control cylinder, and a throttle part is provided near the position of the outer cylinder facing the red-hot lower end of the outer flame cylinder, and a flow control cylinder is further provided above the throttle part. It has a configuration in which two aperture parts are provided.

Effect of the present invention With the above-described configuration, the unburnt gas flowing inside the inner flame tube is removed by clean air supplied from above the flow control tube.
It prevents unburned gas from flowing upwards from the flame, promotes combustion by creating a good mixing state at a position according to the amount of combustion, and prevents unburned gas from flowing above the flame. In addition, unburned gas leaking outward from the outer flame tube is guided into the combustion chamber through a large through hole in the red-hot section of the outer flame tube by the second constriction part, thereby preventing the unburned gas from flowing upward from the flame. . In other words, most of the unburned gas containing CO that flows inward into the inner flame tube or leaks out to the outside of the outer flame tube re-enters the combustion chamber and burns, making it possible to control the amount of combustion over a wide range. Good exhaust gas characteristics can be maintained.

Example An embodiment of the present invention will be described below based on the accompanying drawings.

FIG. 1 shows a strong combustion state, and FIG. 2 shows a weak combustion state. In the figure, reference numeral 1 denotes a lamp wick which is a fuel supply section, and 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 a 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. wick 1
During combustion, the tip of the flame tube is exposed in the combustion chamber 8 formed between the inner flame tube 6 and the outer flame tube 7, where combustion and vaporization occur.

Reference numeral 9 denotes an outer cylinder, and the inner flame cylinder 6, outer flame cylinder 7, and outer cylinder 9 are sequentially arranged approximately 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 opening 13 that communicates upward from the inside of the inner flame tube 6. 141 is a flame expansion plate placed on the inner flame tube top plate 12. The outer flame tube 7 is formed with a pore section 15 having a small air hole 11 and a glowing section 17 having a large through hole 16 above the pore section 15.
A constricted portion 18 of the outer cylinder 9 is provided outwardly between the outer tubes 7 and 7 and has a constant gap S1. Reference numeral 19 denotes a second constriction section provided above the constriction section 18 with a constant gap S2 between the incandescent section 17 of the outer flame cylinder 7, and the gap s2 being larger than the gap s1; A circulation area 2o is formed between the constriction part 18 and the constriction part 18. Reference numeral 21 denotes a transmission tube made of a transparent material such as glass, and is placed on the second constriction portion 19 of the outer tube 9.

A top frame 22 is placed on the upper end of the red-hot part 17 so as to cover the upper end of the air passage 23 between the red-hot part 17 and the transparent cylinder 21, and fixes the transparent cylinder 21. Reference numeral 24 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 25 formed between the inner flame tubes 6. It is provided so that it is substantially shielded by its bottom surface. 26 is an air introduction path.

27 is a ventilation hole provided in a plurality of places in the flow control cylinder 24, and 2B is directly above the ventilation hole 27, and the control area 25 is 25 m.

This is a shielding portion that is divided into 25b and 25o, and is formed by applying beading processing, flaring processing, etc. to make the flow control cylinder 24 protrude in the outer circumferential direction. Reference numeral 29 denotes a ventilation section that is set to have a constant interval between the flow control tube 24 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 supplied to the air holes in the inner flame tube 6 and outer flame tube 7. 11 and the through hole 16 of the red-hot part 17 into the combustion chamber 8, and combustion continues. At this time, the inner flame tube 6
The air supplied from inside is directed to the lamp wick 1 from below the flow control tube 24.
The air is divided into air that is supplied nearby and air that ascends through the air introduction path 26. A portion of the rising air passes through the vent 27 and is supplied to the combustion chamber 8. Further, the air supplied above the inner flame tube 6 is supplied to the combustion chamber 8 and above from the air hole 11 and the opening 13. A part of the air also descends to the control area at 25° and is also supplied to the combustion chamber 8 from the air holes 11 located below the air.

On the other hand, the vaporized fuel becomes a mixed gas with air and mainly rises in the combustion chamber 8. However, the controlled area is 25m, 25b
, 25Sa becomes a negative pressure, so a part of the mixed gas flows into the control area 2.
Ronin within 5m, 25b, 25o. Therefore, the control areas 25m, 25b, and 250 are filled with unburned gas. This unburned gas is mixed with the air flow in the vent hole 27 and the vent section 29, and is again supplied to the combustion chamber 8. Therefore, during strong twist firing, unburned gas and air are supplied from near the upper end of the inner flame tube 6 to the upper end of the combustion chamber 8 in a well-mixed state, resulting in efficient combustion near area A, and furthermore, the unburned gas and air are not completely burned here. The unburnt gas is combusted by the flame FH formed above. Also,
Air supplied from below the outer cylinder 9 is divided into air 31 that is supplied into the combustion chamber 8 from the air hole 11 of the air hole section 15 located below the constriction section 18, and air 32 that passes through the constriction section 8 and rises. It will be done. Since the circulation area 2o has a negative pressure due to the throttle part 18, similar to the control area 25 inside the inner flame cylinder 6, a part of the unburnt gas leaks into the circulation area 20 and into the air passage 23 as a flow 33.
occurs. The unburnt gas leaked into the circulation area 20 is guided into the combustion chamber e through the through hole 16 of the outer flame tube 6 by the second constriction part 19, and into a flow 34 which passes through the second constriction part 19 and becomes air. A flow 35 is generated which enters the passage 23, passes through the through hole 16, and flows back into the combustion chamber 8. Therefore, during strong twist firing, combustion occurs outside the red-hot part 17 of the outer flame cylinder 7, improving the brightness of the red-hot part, and unburned gas that cannot be completely burned here is released into the flame FH formed above. is burned. Therefore, the exhaust gas characteristics are good in strong combustion.

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 the flame is formed as shown in FL shown in FIG. The flow in this case is the same as that during strong twist firing, but since the vaporized gas has decreased greatly, the control areas 25a, 25b, 25o
The amount of unburned gas flowing into the air also decreases. The unburned gas is mixed by the air supplied through the vent hole 27 or the vent section 29, and most of it is supplied to the combustion chamber 8 where it is combusted by the flame FL.

In other words, the unburned gas is blocked from flowing upward from the flame FL by the air supplied through the vent hole 27 and the vent portion 29. Due to this shielding effect, almost no unburnt gas is contained in the control areas 25m, 25b, 250 and the air introduction passage 26 above the flame FL, and the air holes 11 and openings of the inner flame cylinder 6 above the flame The air discharged from 13 is clean.

Further, the unburned gas leaked into the circulation area 20 is also guided into the combustion chamber e by the second throttle part 19, and most of it is transferred to the flame F.
It is burned with L. That is, when the upward ventilation forces of the combustion chamber 8 and the air passage 23 are compared during weak combustion, the upward ventilation force of the combustion chamber 8 is higher. Therefore, the second constriction section 19 reduces the gap S2 to S
l (However, most of the unburned gas flows into the combustion chamber 8. Therefore, almost no unburned gas flows into the air passage 23, and the outer flame tube 7 above the flame FL
The air discharged from the through holes 16 is relatively clean.

In other words, relatively clean air is discharged even during weak combustion, resulting in good exhaust gas characteristics (Co/C02). Therefore, the amount of combustion can be reduced to a considerably low level, and the amount of combustion is wide during combustion adjustment.

FIG. 3 shows a conventional example
In addition, when the second throttle part 19 is provided outside the outer flame cylinder 7, 2
This figure shows the exhaust gas characteristics (Co/C02) with respect to the combustion amount. Compared to the conventional example I understand what is shown.

In addition, in this embodiment, the second throttle part 19 and the outer flame tube 7
Since the gap S2 is wider than the gap $2 between the constriction part 18 and the outer flame tube 7, a large amount of air is sent into the combustion chamber 8 at the second constriction part 19 during strong twist firing, and the combustion There is also the effect that the flame in the chamber 8 is moved closer to the inner flame tube 6 and that no yellow flame is generated in the combustion chamber 8.

Further, since the constricted portion 18 and the second constricted portion 19 are integrally formed in the outer cylinder 9, this is advantageous in terms of cost, assembly, and processing.

As described above, according to the combustion apparatus of the present invention, a flow restricting tube whose bottom surface is substantially shielded is provided inside the inner flame cylinder, and a second restricting portion is further provided above the restricting portion of the outer cylinder. This prevents the unburned gas inside the inner flame cylinder from flowing upwards from the flame,
A good mixing state is formed at a position according to the amount of combustion to promote combustion.

Further, unburned gas leaking outward from the outer flame cylinder is also guided into the combustion chamber by the second constriction part, thereby preventing the unburned gas from flowing upward from the flame. As a result, unburned gas containing high concentrations of co2 is no longer directly released into the atmosphere, and the exhaust gas characteristics (co
/co2), thereby providing a combustion device with excellent usability, safety, and comfort.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part of a combustion device according to an embodiment of the present invention, and shows the state of hard twist firing. FIG. 2 is a cross-sectional view of the main part of the combustion device, showing the state of weak combustion. FIG. 3 is a characteristic diagram for explaining the effect of the combustion apparatus, and shows the combustion amount-co/co2 characteristic. FIG. 4 is a sectional view of a main part of a conventional combustion device. 1...Light wick, 6...Inner flame cylinder, 7...
...Outer flame tube, 8... Combustion chamber, 9...
Outer cylinder, 11... air hole, 18... constriction section, 19... second constriction section, 24... flow control tube, 25m, 25b, 25o... control area. Name of agent: Patent attorney Toshio Nakao and one other person
One light Figure 3 J actual amount (twtlh)

Claims (3)

[Claims] (1) 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; A wick for fuel supply set at the lower end of the combustion chamber formed between the outer flame tube and the inner flame tube, and a wick disposed outside the outer flame tube and facing between the air hole part of the outer flame tube and the red-hot part. and an outer cylinder provided with a constriction part, and a control area formed between the inner flame cylinder and the inner flame cylinder, extending inside the inner flame cylinder from near a position facing the lamp wick to near the upper end of the inner flame cylinder. A combustion device that is provided with a flow control tube that substantially shields the flow control cylinder with a bottom surface, and a second throttle part is provided above the throttle part. (2) The combustion device according to claim 1, wherein the gap S_2 between the second throttle part and the outer flame tube is larger than the gap S_1 between the throttle part and the outer flame tube. (3) The combustion device according to claim 1 or 2, wherein the second constriction portion and the constriction portion are constituted by an outer cylinder.