JPS59219608A - Liquid fuel combustion device - Google Patents

Abstract

PURPOSE:To prevent formation of an excessive rising flame and to ensure a rated combustion amount, by a method wherein a flame uniformizing cylinder, which completely blocks the upper surface of a combustion cylinder and has a plurality of through-holes formed in the peripheral side, is mounted to the upper part of the outer cylinder of a combustion cylinder, and the opening rate of the through-hole in the peripheral side of the flame uniformizing cylinder is set to a value higher than a specified value. CONSTITUTION:An upper end surface 12 of a flame uniformizing cylinder 11 is completely blocked, and oblong through-holes 15 are bored in the upper part of a peripheral side 13. The fuel, evaporated by a wick evaporating part 10a, is burnt in a combustion chamber 5 to produce exhaust gas which is raised by a draft force, collides with the upper end surface 12, and is laterally spread over. The draft force is laterally dispersed by means of a flame uniformizing cylinder 11, whereby, after a flame is laterally spread once, the flame, extending upward, is formed. A central part 19b right above a combustion cylinder is pulled by the draft force to produce a negative pressure, and a flame Fb, which is going to extend upward, is drawn in the direction of a central part right above the combustion cylinder, and a flame extending to the vicinity of a top plate 20 is prevented from formation. The opening rate of the through- holes in the peripheral side 13, of the flame uniformizing cylinder 11 is set to more than 35%, and this enables ensuring of the draft force, permits sufficient supply of the air for combustion, ensures a rated combustion amount through prevention of reduction in a combustion amount, and prevents deterioration of exhaust gas properties.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a wick vaporization type liquid fuel combustion device used in oil stoves, oil stoves, and the like.

Conventional Structure and Problems Conventionally, the combustion tube of this type of liquid fuel combustion device, in which liquid fuel is sucked up by the capillary action of the lamp wick and vaporized at the tip and burned, is as shown in Fig. 1. In many cases, the opening 6a is provided almost directly above the combustion chamber 6; in this case,
A draft force acts in the direction directly above the combustion chamber 5 in the direction of the arrow A. Therefore, for example, when the combustion amount is suddenly changed from the lowest position to the highest position in the adjustment range, the amount of fuel vaporized from the lamp wick vaporizer 10a increases rapidly, causing an excessive rise in the direction directly above the combustion chamber 5 from the opening 6a. Flames Fa were observed, and in extreme cases, the flames could extend beyond the exterior top plate above the combustion tube 1, and there were safety problems such as fire outside the upper front of the appliance. In addition, when the earthquake-resistant automatic fire extinguishing system momentarily lowers the wick to extinguish the fire, air corresponding to the volume of the lowered wick is suddenly pushed into the combustion chamber 6, causing a momentary flame to rise from the opening 5a. was being watched. Furthermore, similar flames were observed when the cartridge tank (auxiliary tank) was replaced for refueling during combustion. In order to prevent such a flare-up, it is necessary to eliminate sudden pressure changes within the tank, and conventionally a pressure equalizing valve 18 or the like has been provided in a part of the tank. These pressure equalizing valves 1 and 8 normally shut off the inside of the tank and the outside air, but only when the tank internal pressure increases suddenly, they open momentarily in the direction of arrow B to eliminate the difference between the tank internal pressure and the outside pressure. This has the function of reducing pressure fluctuations in the combustion chamber and preventing flare-ups, but the structure is complicated, and manufacturing is time-consuming.

Purpose of the Invention The present invention solves the above-mentioned conventional drawbacks, and suppresses excessive standing flames that occur when changing the combustion amount, instantaneous extinguishing, or replacing the cartridge tank. The purpose of the present invention is to provide a liquid fuel combustion device that maintains clean combustion by ensuring a rated combustion amount, reduces the generation of harmful substances such as odor, nuss, and carbon oxide, and has excellent safety.

Structure of the Invention In order to achieve this object, the present invention provides a flame regulating tube in which the upper end surface of the combustion tube is completely closed and a plurality of through holes are bored in the circumferential side at the upper part of the row at the P boundary. The aperture ratio of the through holes on the peripheral side of the flame regulating tube is set to 35% or more. With this configuration, the combustion exhaust gas once hits the upper end surface of the flame regulating cylinder, and then spreads laterally and is discharged from the through hole bored in the peripheral side surface. In other words, the draft force acting in two straight directions is changed to the horizontal direction by the flame regulating tube. Therefore, when the combustion amount is suddenly changed from a low position to a high position in the adjustment range, even if a standing flame occurs, it can be spread laterally. Furthermore, if an even more excessive standing flame is generated (for example, when the combustion amount is changed from the lowest position to the highest position in the adjustment range), the flame will be drawn into the center directly above the flame regulating tube, so it is not possible to ” Excessive flames can be prevented from spreading in two directions. A similar effect can be obtained for standing flames caused by rapid fluctuations in tank internal pressure during emergency fire extinguishing or when cartridge tanks are replaced. Next, set the porosity of the through holes on the peripheral side of the flame regulating cylinder to 35.
% or more, it is possible to ensure the optimum draft force, and a sufficient supply of combustion air is possible, which prevents deterioration of exhaust gas characteristics when a standing flame occurs and during normal combustion. Odor and soot.

- It is possible to reduce the generation of carbon oxides, etc., maintain clean combustion, and prevent a decrease in combustion amount to ensure the rated combustion amount.

Description of examples An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 2, reference numeral 1 denotes a combustion tube, which has a large number of air holes, and includes an inner flame tube 2, an outer flame tube A3, and an outer flame tube A4 arranged substantially concentrically. 3' is an outer flame tube B made of lath steel, punched plate, etc., and is connected to the second part of the outer flame tube A3. 4
' is an outer cylinder B made of heat-resistant glass or the like. A combustion chamber 5 is formed between the inner flame tube 2 and the outer flame tube AB3.3'. 6 is the core inner cylinder, 7 is the core outer cylinder, and above each is the inner fire pan 8.
, an outer flame pan 9 is formed, and an inner flame tube 2 and an outer flame tube 3 are placed thereon. A lamp wick 10 is set between the inner wick tube 6 and the outer wick tube 7 so as to be movable up and down, and the vaporizing part 10a is exposed in the combustion chamber, so that the fuel is vaporized and combusted.

11 is a flame regulating cylinder provided in the second part of the outer cylinder, and its upper end surface 12
is completely closed, and a through hole 14 is bored in the circumferential side surface 13, and a horizontally elongated through hole 16 is bored in the upper part of the circumferential side surface 13. Flame regulating tube 1
The circumferential side surface 1 of the through holes 14 and 15 bored in the circumferential side surface 13 of 1
The open area ratio for No. 3 is set to 35% or more. (Open area ratio @) is the total area of through holes on the circumferential side/total area of the circumferential side x 10
In the above configuration, the upper end surface 12 of the flame regulating tube 11 is completely closed, and the oblong through hole 16 is bored in the circumferential side surface 13'', so that there is no flow from the lamp wick vaporizing section 10a. The vaporized fuel is combusted in the combustion chamber 5 and becomes exhaust gas, which rises due to draft force, collides with the upper end surface 12, and then spreads laterally. Therefore, for example, when the combustion amount is suddenly changed from a low position to a high position in the adjustment range, although the amount of fuel vaporized from the lamp wick vaporization section 10 & is suddenly increased, the draft force is increased by the flame regulating tube as shown by arrow C. Tayu diffused laterally by 11,
A dangerous situation can be avoided because a large flame is not generated directly above the combustion tube as in the conventional case.

Figure 3 shows an even more severe situation, for example, when the combustion amount is suddenly changed from the lowest position to the highest position in the adjustment range, resulting in a large standing flame.The conventional example is shown on the left, and the invention is shown on the right. The state of one embodiment is shown. The conventional one has combustion chamber 5.
Since the opening 6a is located almost directly above the combustion tube, the draft force acts upward, and in this case, the draft force causes a negative pressure in the portion 19& directly above the combustion tube. However, the upward trough I
- Due to the strong force, the flame was gathered in the center and converged above the combustion tube, causing a dangerous phenomenon in which a large flame Fa protruded above the top plate 20, which is a part of the exterior cake. In contrast, in the embodiment of the present invention, the draft force is spread laterally by the flame regulating cylinder 11, so that the flame is once spread laterally and then formed upward. At this time, the central portion 19b directly above the combustion tube is pulled by the draft force and becomes a negative pressure9, so the flame Fb that was about to extend upward is
The flame is not drawn up directly above the combustion tube toward the center, and no flame is formed in the vicinity 1 of the top plate 2o. Next, the through holes bored in the peripheral side surface 13 of the flame regulating tube 11 will be described. -1 through hole 14,1
The aperture ratio arranged on the circumferential side 13 of the combustion chamber 5 is related to the draft force of the combustion tube, and the draft force determines the amount of combustion air supplied to the combustion chamber 6, thereby maintaining high quality combustion. This is important in several ways. In other words, if the porosity is too small, the flow path resistance of the combustion tube will be excessive, resulting in a pressure drop and a significant drop in draft force. Therefore, the amount of combustion air supplied to the combustion chamber 5 will be This decreases the amount of air and causes a lack of air, which generates a large amount of odor, dust, and carbon oxide. In particular, when a standing flame occurs during combustion amount adjustment, the amount of fuel vaporized becomes large and the above phenomenon is exacerbated. However, since the draft force is significantly reduced, the amount of combustion is also reduced. FIG. 4 shows the relationship between the porosity @) of the peripheral side surface 13 of the flame regulating tube 11, the combustion amount, and the carbon monoxide concentration in the exhaust gas in an embodiment of the present invention. The curve a shows the combustion amount (-/μ) versus the porosity (@), and the curve (2) shows the carbon monoxide concentration (ppm) versus the porosity (@). In FIG. 4, as the porosity decreases, the combustion amount decreases and the carbon monoxide concentration in the exhaust gas increases.

Regarding the combustion amount (curve a), a decrease is seen from around 35% of the porosity, and the -carbon oxide concentration (ppm) (
Curve b) There is a tendency for holes to increase rapidly around the porosity of 30.
) is three times as large. Therefore, the flame regulating tube 1 according to the present invention
By setting the aperture ratio of the circumferential side 13 of 1 to 35 inches or more, it is possible to secure a draft force, and a sufficient supply of combustion air can be achieved, thereby preventing a decrease in the amount of combustion. This makes it possible to ensure the rated combustion amount and prevent deterioration of exhaust gas characteristics. Furthermore, FIG. 5 shows a case where a vertically elongated through hole 14 is bored in the circumferential side surface 13 of the flame regulating tube 11 up to the top.
However, in this case, the flame is not divided at many places between the through holes 14, that is, by the many divided parts 14a, and the flame is disturbed and a rift phenomenon occurs, leaving the flame unburned outside the combustion system. When unburned gas is discharged, large amounts of toxic components such as carbon monoxide and odors are generated. The same drawback as described above occurred when a circular hole was bored. FIG. 6 shows an embodiment of the present invention, in which a horizontally long through hole 15 is provided in the upper part of the peripheral side surface 13 of the flame regulating tube 11, so that when the flame is standing in the horizontal direction, the flame is transmitted through the horizontally long through hole. 15, the flame is not divided at many points, and therefore the flame turbulence and rift 1-
The phenomenon is greatly reduced, and the generation of odor, dust, carbon oxide, etc. can be prevented, and clean combustion can be maintained. Even if the fire is extinguished by momentarily lowering the wick using an earthquake-resistant automatic fire extinguishing system, or if the cartridge tank is replaced while the combustor is still burning, the air pushed into the combustion chamber 5 will still flow through the through hole 15. Since it spreads laterally from the beginning, there is virtually no instantaneous flare-up at this time. Therefore, the pressure equalizing valve 18, which was conventionally installed in a part of the tank to reduce sudden pressure changes inside the tank, is no longer necessary from a safety standpoint, and the manufacturing effort and costs are also reduced. can.

Effects of the Invention As described above, the liquid fuel combustion device of the present invention has a flame regulating tube on the upper part of the outer cylinder of the combustion tube, which completely closes the upper end surface of the combustion tube and has a plurality of through holes in the peripheral side. By setting the aperture ratio of the through holes on the circumferential side of the flame regulating tube to 35% or more, the draft force can be changed in the lateral direction, for example, when the combustion amount is suddenly changed from the lowest position to the highest position. Excessive standing flames or excessive standing flames that occur during emergency fire extinguishing or when cartridge tanks are replaced during combustion can be spread laterally, suppressing excessive upward standing flames that conventionally occur, and optimal trough 1. - It becomes possible to secure sufficient power and supply a sufficient amount of combustion air into the combustion chamber, which prevents deterioration of exhaust gas characteristics when a standing flame occurs and during normal combustion, and reduces odor and soot.

- It reduces the generation of carbon oxides, etc., maintains clean combustion, prevents a decrease in the combustion amount, secures the rated combustion amount, and provides excellent safety.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view of a combustion tube of a conventional liquid fuel combustion device, FIG. 2 is a partial sectional view of a combustion tube of a liquid fuel combustion device according to an embodiment of the present invention, and FIG. 3 is an explanation of the operation of the device. figure,
FIG. 4 is an operational characteristic diagram of the same device, and FIGS. 6 and 6 are explanatory diagrams of the operation of the same device, respectively. 1... Combustion tube, 2... Inner flame tube, 2...
...Outer flame tube A, 3'...Outer flame tube B14...
...Outer cylinder A, 4'...Outer cylinder B, 6...
... Combustion chamber, 10...Light wick, 11...
Flame regulating cylinder, 13... Circumferential side, 14... Through hole, 15... Oblong through hole. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Fig. 6 δ Fig. 2 Fig. 3 Fig. 4 Vertical moxibustion Kahiro 1 law direction open σ rate (%)

Claims (1)

[Claims] (1) A combustion tube is formed by sequentially arranging an inner flame tube, an outer flame tube, and an outer tube having a large number of small holes in a substantially concentric manner, and a combustion chamber formed between the inner flame tube and the outer flame tube. The vaporizing part of the wick is exposed and burned, and a flame regulating tube is provided in the upper part of the outer tube, the upper end surface of the combustion tube is closed, and a plurality of through holes are bored in the circumferential side. A liquid fuel combustion device in which the porosity of the perforations on the peripheral side is set to 35% or more. (b) The liquid fuel combustion device according to claim 1, wherein the flame regulating cylinder has a horizontally elongated through hole in the upper part of its circumferential side.