JPS58158414A - Combustion device - Google Patents

Abstract

PURPOSE:To enable a holding of sufficient aperture combustion even under a strong draft at the combustion part by a method wherein an open type stove, etc. having a fan is made such that a volume of air required for combustion is of such an air passage arrangement for enabling an introduction of air accompanied by the combustion more than a natural draft. CONSTITUTION:An inner flame cylinder 5 and an outer flame cylinder 6 which have several air holes therein are concentrically arranged in a burner 1 so as to constitute a combustion cylinder 4, an outer cylinder 7 is concentrically arranged around an outer circumference of the combustion cylinder, and then a cap 8 for closing these cylinders 5 to 7 is arranged. Said outer cylinder 7 is formed to have a higher height than that of the inner and outer flame cylinders 5 and 6, and a front air passage wall 10 and a back wall 11 are arranged with a clearance 9 being made at an outer circumference thereof. The clearance 9 is closed at a lower end of the outer cylinder 7 by the partition plate 13 having a draft adjusting opening 12 so as to form an air bypassing passage. Thereby, during burning, the air is fed by fan 18 as shown by an arrow shown with a solid line, fed to the combustion cylinder 4 and the air other than that required for combustion is released from the passage hole 12 to the bypassing air passage 9.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an open type stove using a fan, particularly one using a multi-tube combustion method such as a kerosene stove.

Conventionally, open stoves using fans have adopted an air passage configuration that does not disturb combustion in the combustion section A, as shown in FIG. In particular, the multi-tube combustion method is useful as an open stove due to its quiet combustion sound, wide fuel adjustment range, and low NOx properties as it is a small flame split combustion mainly based on diffuse combustion. It was said that he was weak against such things. Therefore, the combustion air was drawn in by the draft accompanying the combustion, and the air flow by the fan did not impede this draft, but was designed to create an air passage structure that would control the draft.

Therefore, as shown in Figure 1, the air passage configuration was designed to maximize the natural combustion ability of the combustor. However, on the other hand, multi-tube combustors that mainly use diffusion combustion have a low natural combustion capacity and have the disadvantage of not being able to obtain a high combustion rate. For example, a combustion tube of φ120 x 230" has a maximum of 25
It was possible to burn the fuel only up to about 00KcaR/h.

However, in our experiments, we discovered that by appropriately selecting the arrangement of the pores in the inner and outer flame cylinders, it is possible to achieve very stable combustion even in the presence of a strong air flow from below. In other words, it was discovered that if the air supplied to the inner and outer flame tubes is balanced, pore combustion can be maintained sufficiently even if a strong draft is applied to the combustion section by a fan, and the above-mentioned combustion tube can achieve a combustion rate of over 4000 Kcaj2/h. We were able to ensure combustion.

Embodiments of the present invention will be described below with reference to FIG.

Reference numeral 1 denotes a burner, which has a plurality of ejection ports 2 for ejecting gas uniformly, and supplies fuel from a gas supply pipe 3. Reference numeral 4 denotes a combustion cylinder, in which an inner flame cylinder 5 and an outer flame cylinder 6 having a large number of pores are placed concentrically on the burner 1, and an outer cylinder 7 having no pores on the outer periphery.
are arranged concentrically, and a cap 8 is placed to close off both the inner flame tube 5 and the outer flame tube 6 and outer tube 7.

This outer cylinder 7 is set sufficiently higher than the inner and outer flame cylinders 5 and 6, and is surrounded by a front air duct wall 10 and a back plate 11 with a gap 9 left in its outer periphery. The gap 9 is closed at the lower end of the outer cylinder 7 by a partition 13 provided with a draft (pressure) adjusting hole 12 to form an air bypass passage. 14 is an indoor air intake provided on the back plate 11; 16 is a burner stand; 16
18 is a fan, and 19 is a hot air outlet.

In the above structure, as the ignition is performed, exhaust gas is formed in the pores of the fan 18 and the inner and outer flame tubes 6, 6, and rises as indicated by the broken line arrow. On the other hand, air is supplied as shown by the solid line arrow, and is supplied as combustion air from the inner periphery of the inner flame cylinder 5 and between the outer flame cylinder 6 and the outer cylinder 7 to each pore.

Air in excess of that required for combustion is allowed to escape into the air passage 9 in a bypass manner through a through hole 12 provided in the partition body 13, thereby preventing more than necessary air from entering the combustion section. These air flows are generated by the fan 18, and the combustion exhaust gas and the air from the bypass air passage 9 are mixed and blown into the room from the outlet as shown by the white arrow. In other words, the air passage structure is such that the necessary amount of air required for combustion can be introduced in excess of the natural draft that accompanies combustion, and this is combined with the effect of rectifying the supplied air resulting from the arrangement of the air holes in the inner and outer flame tubes and the structure of the combustion tube. It is thought that this allows air to be supplied without turbulence, forming a stable flame with small flame holes. In addition, this method has overturned the conventional wisdom that kerosene heaters are weak against wind and can cause the flame to move and create a flapping sound just by passing by, and has achieved stable combustion that enables nearly double the flame hole load. .

Figure 3 shows a simple application example to the conventional example,
Between the outer cylinder 7 of the combustion tube 4 and the rear air duct wall 2o and the front air duct wall 1
0 and the outer cylinder 7 is provided with a partition 13'. By providing a bypass air passage opening 12' in an air intake port 14' provided in the back plate 11, air supply to the combustion section is controlled by adjusting this area. The other operations are the same and the same effects can be expected.

As described above, by providing a partition between the combustion tube and the air passage wall and increasing the amount of air supplied to the combustion section, it is possible to take advantage of the characteristics of the combustion tube configuration and provide optimal combustion conditions.
This provides a simple and stable combustor that takes advantage of the effects of the diffusion combustion method and eliminates its drawbacks.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a conventional basic configuration, FIG. 2 is a sectional view of a combustor according to an embodiment of the present invention, and FIG. 3 is a sectional view of the same embodiment. 4... Combustion tube, 6... Inner flame tube, 6...
...Outer flame cylinder, 7...Outer cylinder, 9...
Air passage (air) (for A, <S), 1゜...Front air passage wall, 12...Pressure (draft) adjustment vent, 1
3, 13'... Partition body, 16... Air path (for hot air). Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2

Claims (2)

[Claims] (1) A combustion tube configured by concentrically arranging an inner flame tube having a large number of pores, an outer flame tube, and an outer flame tube having no pores; an air path surrounding this combustion tube; A combustor comprising an air blower that generates airflow in an air passage, and provided with a partition that closes a gap between the outer cylinder side wall and the air passage wall. (2) The combustor according to claim 1, wherein the partition body is provided with a pressure adjustment port.