JPS61208414A - Combustion cylinder - Google Patents

Abstract

PURPOSE:To keep almost constant the ratio of the air in the primary combustion chamber and the fuel in a wide variable range of combustion amount and reduce the odor and the carbon monoxide by lifting up and down a secondary combustion cylinder provided with an air inlet which projects into the upper section of an inner flame cylinder and partly directed in its outer circumferential direction with the movement of the secondary combustion cylinder interlinked with the up-and-down movement of the flame wick. CONSTITUTION:The air is increased or reduced by the variation in pressure loss applied in a combustion chamber by changing the gap between the inner circumference of a secondary flame ring 7 and the outer circumference of a secondary combustion cylinder 8. The secondary combustion cylinder 8 is interlinked with the up-and-down mechanism of a flame wick 1 to be lifted up and down correspondingly. It is possible, therefore, to keep the ratio of combustion amount (vaporization amount) and air amount substantially constant by giving an appropriate relation between the height of exposure for a flame wick 1 and the gap between the secondary flame ring 7 and secondary combustion cylinder 8, and also to prevent abnormal combustion due to excess or shortage of the air. The secondary air is supplied substantially perpendicularly to the unburned gas that rises from a primary combustion chamber by providing an air inlet 8a on the side of outer circumference of the secondary cylinder 8, improving the mixture of the unburned gas in the secondary combustion section with the secondary air.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a combustion tube for a double-tube oil combustor having an inner flame tube having a large number of small holes and an outer flame tube.

Conventional technology The combustor, which forms a combustion chamber with an inner flame tube with many small holes and an outer flame tube, can be used as a home heater such as a portable kerosene stove, and does not require a power source, is small and lightweight, is convenient to move, and is less likely to break down. It has many advantages and is the mainstream of home heaters.

Conventionally, this type of combustion tube has been often used with the configuration shown in FIG. That is, 1 is a lamp wick whose lower end is not shown in the figure, but is immersed in fuel in a fuel tank provided at the bottom, and its upper end is exposed in the combustion chamber. Reference numeral 2 denotes an inner flame tube having a large number of small holes, and 3 an outer flame tube having a large number of small holes.A combustion chamber is formed in the gap between the inner flame tube and the inner flame tube. Reference numeral 4 is an incandescent tube that is connected to the outer flame tube 3 and is made of lath, punched metal, wire mesh, etc. and has a larger opening ratio than that of the outer flame tube, and 5 is an outer flame tube made of a heat-resistant light-transmitting material such as glass. The cylinder, 6 is a metal outer cylinder that holds the outer cylinder 5, 7 is an upper lid that is connected to the inner flame cylinder 2 and has an air hole, and 8 is a flame plate that is fixed to the upper lid 7.

In the above configuration, in a steady combustion state, the fuel gas vaporized from the tip of the wick 1 is transferred to the small hole of the inner flame tube 2 and the outer flame tube 3.
The mixture is mixed with air supplied by natural draft into the combustion chamber through the small holes and the opening of the incandescent cylinder 4, and while partially combusted, the air (secondary air) supplied from the air hole in the final upper cover 7 causes complete combustion. . In this type of combustion method, 2
The supply of air (primary air) at 1 that runs to the next combustion position (the position where secondary air is supplied) is supplied in a very dispersed state (because it is supplied from small holes and distributed openings). As a result, there is a large amount of unburned gas in the lower part of the combustion chamber, and the higher the part, the more diluted the unburned gas becomes, making complete combustion difficult. Therefore, a method has been used in which air is intensively supplied to the secondary combustion section to achieve complete combustion while leaving a suitable amount of unburned gas components.

Problems to be Solved by the Invention However, with such means, even if the exposed height of the lamp wick 1 is increased or decreased to adjust the amount of combustion, and the amount of vaporization is changed, the amount of air supplied is almost negligible. For example, if the exposed height of the lamp wick 1 is reduced, the amount of fuel vaporized will be reduced, but the amount of air will not change and the amount of air will be excessive, and the unburned gas will be diluted by the time it reaches the secondary combustion section. This results in incomplete combustion, producing carbon oxides and odors, which poses a problem in that the range for adjusting the amount of combustion is extremely narrow.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a secondary combustion system which is provided with an air port in the upper part of the inner flame cylinder that protrudes toward the combustion chamber side and at least a part of which is perforated in the outer circumferential direction. A tube is provided, and the secondary combustion tube is moved up and down in conjunction with the rise of the wick.

For production The effect of this technical means is as follows.

When the exposed height of the wick is high, that is, when the amount of vaporization is large, the secondary combustion tube is located at a high position, and the gap between the outer wall of the combustion chamber and the secondary combustion tube is wide, resulting in low pressure loss. The amount of air supplied into the combustion chamber is large, but lowering the exposed height of the lamp wick reduces the amount of vaporization, and at the same time, the position of the secondary combustion tube is lowered, causing the outer wall of the combustion chamber and the secondary combustion tube to be As the interval between υ narrows and the pressure drop increases, the amount of air supplied into the combustion chamber also decreases. Therefore, by setting an appropriate relationship between the height of the lamp wick and the vertical height of the secondary combustion tube, it is possible to prevent excess air in the primary combustion chamber even when the combustion amount is low. Since combustion can be obtained, the amount of combustion can be adjusted for a longer period of time.

Embodiment Hereinafter, one embodiment of the present invention will be described based on the accompanying drawings. In FIG. 1, reference numeral 1 denotes a lamp wick whose lower end is not shown in the figure, but is immersed in fuel in a combustion tank provided at the bottom, and its upper end is exposed in the combustion chamber.

Reference numeral 2 denotes an inner flame tube having a large number of small holes, and numeral a denotes an outer flame tube having a large number of small holes.A combustion chamber is formed in the gap between the inner flame tube and the inner flame tube. 4 is an incandescent tube connected to the outer flame tube 3 and made of lath, punched metal, wire mesh, etc. I) has an aperture ratio larger than that of the outer flame tube; 5 is an outer tube made of a heat-resistant light-transmitting material such as glass; ,
6 is a metal outer cylinder that holds the outer cylinder 5; 7 is two flame rings provided at the upper end of the incandescent cylinder 4; 8 is a secondary combustion cylinder, which is a feature of the present invention; The secondary combustion tube is larger than the diameter and equipped with an air hole 8a on the outer periphery, and the secondary combustion tube is linked with the elevator groove (circle) of the lamp wick 1 by a connecting shaft 9, so that when the lamp wick 1 descends, the secondary combustion tube 8 also descends. It has a structure.

In the above configuration, fuel is vaporized from the exposed portion of the lamp wick 1 by combustion heat during steady combustion and air supplied from the small holes at the bottom of the inner flame tube 2 and the outer flame tube 3. The same vaporized gas mixes with the air supplied from the small holes of the inner flame tube 2, the outer flame tube 3, and the opening of the incandescent tube 4, rises while partially burning, and passes through the air hole 8a of the secondary combustion tube 8. Complete combustion is achieved by supplied air. Since the air supplied to the combustion chamber is supplied by a draft generated within the combustion cylinder, the amount of air can be adjusted by adjusting the pressure drop applied to the flow path within the combustion chamber.

That is, in the embodiment, 2
By changing the gap between the inner periphery of the flame ring 7 and the outer periphery of the secondary combustion cylinder 8, the pressure loss in the combustion chamber changes and the amount of air increases or decreases. When the exposed height of the lamp wick 1 is maximized, the evaporation area increases and the amount of evaporation becomes maximum. The secondary combustion tube 8 is raised by the connecting shaft 9 that interlocks with the elevator groove of the lamp wick 1, and the gap between the secondary combustion tube 8 and the two flame rings 7 is maximized, and the pressure loss applied to the combustion chamber is minimized, so that the amount of air is increased. becomes maximum. On the other hand, when the wick height is set to the minimum, the position of the secondary combustion tube is lowered, the gap between the secondary combustion tube 8 and the two flame rings 7 is minimized, and the amount of air is also minimized. Therefore, the exposed height of wick 1 and 2 flame rings,
By optimizing the relationship between the gaps between the secondary combustion cylinders, the ratio between the amount of combustion (vaporization) and the amount of air in the primary combustion chamber can be made almost constant, and abnormal combustion due to excess or deficiency of air can be prevented. Also, an air port 8a is provided on the outer circumferential side of the secondary combustion tube 8.
By providing the secondary air, the secondary air is supplied almost perpendicularly to the unburned gas rising from the primary combustion chamber, and the mixing of the unburned gas and the secondary air in the secondary combustion section is improved.

DETAILED DESCRIPTION OF THE INVENTION As described in detail, the present invention includes a secondary combustion tube, which has an outer diameter larger than the inner flame tube, has an air port in the outer circumferential direction, and is raised and lowered in conjunction with the exposed height of the wick, at the upper part of the inner flame tube. As a result, the ratio of air and fuel in the primary combustion chamber remains approximately constant over a wide variable range of combustion amount, resulting in combustion with less sea oxide carbon and less odor.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of the main part of a combustion tube according to an embodiment of the present invention;
The figure is a sectional view of a main part of a conventional combustion cylinder. 1...Light wick, 2...Inner flame tube, 3...
...Outer flame tube, 8...Secondary combustion tube. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2

Claims (1)

[Claims] A combustion chamber is formed in the gap between the inner flame tube and the outer flame tube, each having a large number of small holes, and the outer diameter of the inner flame tube is larger than that of the inner flame tube, and at least a part of the air port is provided on the outer circumferential side. , a combustion tube equipped with a secondary combustion tube that moves up and down in conjunction with the lifting and lowering of the lamp wick.