JPS60200009A - Liquid fuel burner - Google Patents

Abstract

PURPOSE:To prevent an increase in carbon monoxide and lowering in red-hot brightness, by a method wherein a small opening sphere whose opening ratio is made smaller than that of the lower part is provided on the upper part of an external flame cylinder and a crowded void part is provided on an ineternal flame cylinder of a part opposing to the small opening sphere. CONSTITUTION:Fall-in of flame into a combustion chamber 5 at the time of a low heating value and eliminating of flame retention at a void on the upper part of a red-hot unit are prevented by forming a small opening sphere 9 having a void 4 whose opening area is smaller than that of the lower part on the upper part of a red-hot part 7 of an external flame cylinder 2. Then the temperature in the vicinity of an internal flame cylinder 1 of a part opposing to the small opening sphere 9 is made to rise by making a large number of stable flames form here by providing a crowded void part 10 here further. With this construction, waste gas properties are prevented from deteriorating by a method wherein the flame and the red-hot unit are cooled and it is possible to contrive prevention of cooling of the flame and deterioration of red-hot brightness.

Description

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

Conventional separation and its problems Conventionally, in a wick type liquid fuel combustion device, as shown in Fig. 1, a combustion chamber is formed between an inner flame tube A and an outer flame tube 8 having a large number of air holes a. The tip of the wick is exposed at C to vaporize and burn the fuel. Normally, the outer flame cylinder B has a red-hot part G in which the opening area of the air hole a is considerably enlarged above the constricted part F of the outer cylinder E, and a large amount of air is introduced into the combustion chamber C from this air hole. Then, it was mixed with the fuel vaporized from the lamp wick and burned, making the red-hot part G red-hot and obtaining radiant heat.

In such a liquid fuel combustion device, in normal combustion, a flame f1 is formed between the upper end of the flame expansion plate H and the secondary flame ring I, and the combustion is completed at the tip of the flame f1. Exhaust gases, especially carbon oxide emissions, are small and combustion is relatively clean.However, if the exposed height of the wick is lowered to reduce the amount of heat generated, the flame will fall into the combustion chamber and the f2 Normally, a flame fr is formed in the air holes of the inner and outer flame tubes A and B, but when the lower part goes down to f2, no flame is formed in the air holes above it, and the resistance becomes smaller, and a large amount of air is guided in the direction of the arrow.As a result, the tip of the flame 12 and the area near the contact point between the inner and outer flame cylinders and the flame are cooled, so the combustion reaction here is suppressed and the reaction is reduced. The combustion exhaust gas is released before the combustion is completed, and the amount of carbon oxide emissions increases rapidly.Furthermore, the brightness of the red heat near the upper end of the red hot part decreases, which is a problem.

Purpose of the Invention The present invention improves the above-mentioned problems, suppresses the fall of the flame into the combustion chamber even when the calorific value is reduced, and prevents a drop in temperature near the upper ends of the inner and outer flame tubes. The purpose is to improve the characteristic of low calorific value 1.7 by preventing an increase in carbon monoxide emissions and a decrease in red glow brightness.

In order to achieve the second object of the invention, the present invention provides a small aperture area with a smaller aperture ratio than the lower part in the upper part of the red hot part formed above the outer flame tube, and also has a small aperture area. A dense pore portion is provided in the inner flame cylinder in the portion facing the C1 region.

DESCRIPTION OF EMBODIMENTS 1. An embodiment of the present invention will be described with reference to the drawings. In Fig. 2, 1 is the inner flame tube, 2 is the outer flame tube, and 3 is the outer flame tube, and the champions are arranged in a substantially concentric circle in order. The inner flame tube 1 and the outer flame tube 2 have a large number of air holes 4, and air is introduced into a combustion chamber 5 formed between them. The outer flame cylinder 2 forms a red-hot part 7 above the constriction part 6 formed on the upper blade of the outer cylinder 3. The air holes 8a provided in the red-hot part 7 are set to have a fairly large opening area, but the upper part of the red-hot part 7 has a small opening area 9 that has an air hole 8b having a smaller opening area than the lower part. is formed. Further, a dense pore portion 10 having more air holes 4 than other portions of the inner flame tube 1 is formed in a portion of the inner flame tube 1 that faces the small opening area 9 of the outer flame tube 2. 11 is inner flame tube 1
The camp placed on the upper end has a plurality of ventilation holes 12. 12 is a flame expansion plate. 13 is a glass cylinder placed above the outer cylinder 3; 14 is a secondary flame ring placed above the outer flame cylinder 2 and the glass cylinder 14. An exhaust gas passage 15 is formed between the flame expansion plate 12 and the secondary flame ring 14.

Reference numerals 16 and 17 designate inner and outer core housing cylinders, the upper ends of which form an inner fire pan 18 and an outer fire pan 19, respectively. It is placed on 19. Reference numeral 20 denotes a lamp wick which is housed between inner and outer core housing tubes 16 and 17 so as to be vertically movable.

In the above U4 formation, when the lamp wick 21 is ignited, combustion starts, and the high-temperature combustion gas due to combustion rises in the combustion chamber 5 and passes through the exhaust gas path 15, creating a thermal draft, and the air necessary for combustion flows as shown in the arrow. The liquid fuel is evaporated by the heat of the combustion flame i□ that flows in through the air holes 4 of the inner flame tube 1, the outer flame tube 2, and the air holes 8a and 8b of the red-hot part 7, and is held in each air hole as shown in FIG. and continue combustion. During normal combustion, 1 between the flame expansion plate 12 and the secondary ring 14 as in the conventional example
A flame fa is formed above the gas path 16, and the amount of carbon monoxide emitted is small because combustion is completed at the tip of the flame. If the exposed height of the wick is lowered to reduce the amount of heat generated, the flame will be inside the combustion chamber in the conventional example, and the flame that was formed in the air hole at the upper end of the incandescent body will disappear, allowing the air to flow in from here. This caused the flame and red-hot body to cool down, worsening the combustion exhaust gas. However, in this embodiment, a small opening region 9 having an air hole 8b having a smaller opening area than the lower air hole 8a is provided above the red-hot part 7, so that air flows into the combustion chamber 5 from above the red-hot part 7. Since combustion is suppressed here by suppressing the air, combustion can be maintained above the red-hot part 7, and it is possible to prevent the flame ■ from going down into the combustion chamber, and to maintain the flame fr. Therefore, the upper part of the red-hot part is not cooled, and therefore, it is possible to prevent the exhaust gas from deteriorating and also to prevent the red-hot brightness from decreasing. In addition, by providing the inner flame tube 1 with a dense pore portion at a position facing the small opening region 9, a large number of stable flames 1s are formed there, and the temperature in this vicinity is increased, so that the temperature above the incandescent body is increased. It is possible to prevent cooling and maintain red-hot brightness, which is further effective in preventing deterioration of exhaust gas characteristics.

Figure 3 shows the exhaust gas characteristics of the conventional example (dashed line) and the example of the present invention (solid line). Even when the calorific value is small, the exhaust gas characteristics are quite good, and the effect of the present invention is clear. It is.

Effects of the Invention In the present invention, the upper part of the red-hot part of the outer flame tube is opened more than the lower part.
By forming a small opening region with air holes with a small area, it is possible to prevent the flame from falling into the combustion chamber when the calorific value is low, and to prevent the air holes above the incandescent body from breaking out of flame stability. This makes it possible to prevent the exhaust gas characteristics from deteriorating due to cooling of the incandescent body. Furthermore, by providing a dense pore part in the inner flame cylinder in the part facing the small opening area,
Since a large number of stable flames are formed here and the temperature in the vicinity is increased, it is effective in preventing flame cooling and deterioration of incandescent brightness, thus improving exhaust gas characteristics at low calorific value. be able to.

[Brief explanation of the drawing]

Figure 9iS1 is a sectional view of the main part of a conventional liquid fuel combustion device,
FIG. 2 is a sectional view of a main part of a liquid fuel combustion device according to an embodiment of the present invention, and FIG. 3 is a characteristic diagram showing the effects of the present invention. 1. Inner flame tube, 2... Outer flame tube, 3... Outer tube, 4... Air hole, 5... Combustion chamber, 7... Red-hot part, 9. Small pore area, 10... Dense pore area. Figure 1 Figure 2 Figure 3 □ Calorific value

Claims (1)

[Claims] The combustion tube is separated by arranging an inner flame tube and an outer flame tube having a large number of air holes in a substantially concentric circle from the inside to the outside, and air with a large opening area is placed above the outer flame tube. A red-hot part with equal holes is provided above the red-hot part than the lower part, and a small opening area having a small area of air holes is formed above the red-hot part, and an inner flame cylinder of the part in the row in the small opening area is formed. A liquid fuel combustion device in which a dense pore section has a larger number of air holes than other sections.