JPH02290407A - Combustion cylinder for petroleum burner - Google Patents

Abstract

PURPOSE:To enable execution of stable microcombustion without lowering combustion gas performance by a method wherein the size of the through-hole of an outer flame cylinder positioned facing a heat resistant heat transmission cylinder is set to a value higher than that of a through-hole positioned facing a lower non-transmission cylinder, and a distance between adjoining through-holes of the outer flame cylinder in the vicinity of the support part of the heat resistant heat transmission cylinder is lower than that between adjoining through-holes positioned facing the non-transmission cylinder. CONSTITUTION:An outer cylinder 3 has an upper and a middle part formed with a heat resistant heat transmission cylinder 3', and a lower part formed with a non-transmission cylinder 3''. When combustion is effected in the middle between inner and outer flame cylinders 1 and 2 in a state that a wick is extremely lowered, a distance between adjoining through-holes 2'' of the outer cylinder 2 in the vicinity of a support part 4 of the heat resistant heat transmission cylinder 3' situated to the upper part of the non-transmission cylinder 3'' is lower than that between through-holes 2'' formed in a lower part. Thus, even when leak gas is raised, a coarse is narrowed by the support part 4 and the leak gas is pressed against the outer flame cylinder 2 side. Since the through-holes 2'' at a part against which the gas is pressed are densely formed (an numerical aperture is high), the gas is sucked in a gap between the inner and outer flame cylinders 1 and 2 again to perform recombustion. Since combustion in a state that the wick is lowered is stable, even when the wick is rapidly raised from the wick-lowered state, a state in which a combustion flame rises up extremely is prevented from production.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a mechanism for improving combustion performance at low calorific value in a double-tube combustion tube of an oil combustor.

[Conventional technology]

Conventional oil combustors with twin-tube combustion tubes adjust the firepower by moving the wick up and down.In order to improve combustion performance, the hole position, number, and hole diameter of the inner and outer flame tubes can be varied to improve combustion performance. Describe the characteristics of each device.

[Problem to be solved by the invention] In order to maintain good performance of the oil combustor, the thermal power adjustment range should not be too large;
Single-point adjustment used to be common sense, but recently consumers have been requesting wider adjustment ranges, and efforts are being made to achieve this, but when the firepower is reduced to low combustion, the draft The balance will be disrupted, causing problems such as incompletely combusted gas being released. Therefore, in the past, stable combustion could not be achieved with such a reduced combustion amount.

[Means for solving problems]

This invention allows the incompletely combusted gas to be brought back into the combustion zone (
This improvement was made by focusing on the fact that it can be re-burned by returning it to the inner and outer flame tubes (between the inner and outer flame tubes).

〔Example〕

Groove formation will be explained below with reference to figures showing examples.

Reference numeral 1 designates an inner flame tube constituting a dual-tube combustion tube, 2 an outer flame tube, and 3 an outer tube. It is formed of an opaque tube 3".4
5 is the outer cylinder receiving part of the opaque cylinder 3'' which is visible from the upper part of the outer flame cylinder 2 toward the outer flame cylinder 2, 5 is the flame expansion device installed above the top plate of the inner flame cylinder 1, and 6 is the outside of the flame expansion device 5. The upper flame tube that covers both sides forms a secondary combustion chamber. In 7, an upper flame tube 6 is mounted on the outer end, and the inner edge is seen above the gap between the inner and outer flame tubes 1 and 2. The secondary combustion chamber bottom plate 7 is attached to the upper end of the outer flame tube 2 and holds the upper end of the heat-resistant heat transmitting tube 3' forming the outer tube 3. 8 is a bottom plate of the secondary combustion chamber. This is an air hole drilled in the bottom plate 7 of the secondary combustion chamber near the upper flame tube 6. If necessary, it forms an air flow along the inner surface of the upper flame tube 6, and the flame formed by the flame spreader 5 is connected to the upper flame. The inner surface of the tube 6 is made not to touch.The small hole drilled in the outer flame tube 2 is located in the portion facing the heat-resistant heat permeable tube 3' rather than the small hole 2'' in the portion facing the impermeable tube 3''. The small holes 2' at the center and top of the are made large in diameter, and the top row of small holes 2' with small diameters has a large number of small holes 2' at a fine pitch.
9 is a wick whose tip is exposed to the gap between the inner and outer flame tubes 1 and 2, and 10 is a wick housing tube that supports the wick 9.
The inner and outer flame tubes 1 and 2 are mounted on a core housing tube 10.

Reference numeral 11 denotes an air baffle plate that covers the lower end of the gap between the outer cylinder 3 and the outer flame cylinder 2 and has a large number of small holes.

[Explanation of action]

In this invention, which has the above structure, when the wick 9 is ignited by an appropriate method, the petroleum gas vaporized from the wick 9 ascends through the gap between the inner and outer flame tubes 1 and 2 while thermally decomposing and burning. Combustion is carried out by absorbing the air necessary for combustion through the holes provided in the flame tube.

As in the embodiment, when the secondary combustion chamber is formed, the gap between the outer cylinder 2 and the outer flame cylinder 3 is raised, and a large amount of air supplied from the small hole 2' in the upper part and from inside the flame expander 5 are A large amount of air is supplied, resulting in white-yellow flame combustion and complete combustion.

In normal maximum combustion, the flame extends into the secondary combustion chamber and burns, but when you want to reduce the power, lower the wick 9 so that the tip of the flame falls between the inner and outer flame tubes 1 and 2. The minimum adjustment range was 50%. Of these...
When combustion occurs in the upper part between the outer flame tubes 1 and 2, there is no incomplete combustion, but users often lower the wick to the extreme and burn in the middle between the inner and outer flame tubes 1 and 2. In such a case, the draft by the inner and outer flame tubes 1 and 2 will decrease, and some unburned gas will leak to the outside of the lower part of the outer flame tube 2, and this leaked gas However, in this invention, the temperature of the outer flame tube 2 near the receiving part 4 of the heat-resistant heat permeable tube 3' provided at the upper part of the opaque tube 3'' is increased. Since the through hole 2M is made denser than the lower through hole 2'', even if the leaking gas rises, its path is pinched by the receiving part 4 and it is pushed toward the outer flame cylinder 2, and the pressed part is Through hole 27
is dense (large aperture ratio), so the inner and outer flame tubes 1 and 2 are
It is sucked into the gap and reburned. In addition, since combustion is stable with the wick lowered in this way, even if the wick is suddenly raised from the lowered state, the combustion flame will not rise significantly.

〔effect〕

As described above, according to the present invention, even if the draft in the combustion cylinder falls due to weak combustion and unburned gas leaks, the through holes 2n' are made dense at the position facing the outer cylinder receiving part 4, so that the receiving part If the gap between the gas cylinder 4 and the outer flame tube 2 is set in advance based on a design standard, the flow path of the leaked gas is constricted and flowed toward the outer flame tube 2 side. The gas flowing to the outer flame tube 2 side easily passes through the through holes 2'' because they are dense (large aperture ratio), and flows into the gap between the inner and outer flame tubes 1 and 2 again to be re-burned. It does not generate odor and therefore does not degrade combustion gas performance, making stable micro-combustion possible.

In the embodiment, the invention has been described as one that performs white-yellow flame combustion (two-stage combustion), but regardless of the combustion method, the invention has a wide range of application to mechanisms with a wide range of firepower adjustment.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part of an oil combustor according to an embodiment of the present invention, and FIG. 2 is a detailed view of the main part. 1... Inner flame tube, 2... Outer flame tube, 3...
...Outer cylinder 4...Receptacle, 2', 2", 2"
...Through hole 3'...Heat-resistant heat-transmissive cylinder, 3''...impermeable cylinder. 167 years old 1 child

Claims (2)

[Claims] (1) A dual-tube combustion tube is provided in which an inner flame tube 1, an outer flame tube 2, and an outer tube 3 are arranged concentrically, and the outer tube 3 has an upper part as a heat-resistant heat permeable tube, and a lower part as an opaque tube. In the combustion tube of an oil combustor configured with 3", the through hole 2' of the outer flame tube 2 facing the heat-resistant heat permeable tube 3' is larger than the through hole 2" facing the lower opaque tube 3''. The diameter of the through holes 2'' of the outer flame tube 2 near the receiving part 4 of the heat-resistant heat permeable tube 3' provided at the top of the opaque tube 3'' are denser than the through holes 2'' of the oil combustor. combustion tube. (2) A combustion tube for an oil combustor according to claim 1, wherein the through hole 3'' is bored below the portion facing the receiving portion 4.