JPH0238182Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to a liquid fuel combustion device that sequentially vaporizes and burns liquid fuel through a lamp wick.

[Technical background of the invention and its problems]

This type of liquid fuel combustion device is used, for example, as a kerosene stove for indoor heating, in which the lower end of a cylindrical wick is immersed in liquid fuel, and the wick sequentially sucks up and vaporizes the liquid fuel.
This vaporized gas is combusted through a combustion tube placed above the lamp wick. The combustion power is adjusted by moving the wick up and down, but this type of adjustment means has the disadvantage that it is difficult to adjust the combustion power over a wide range.

Recently, the wick has been divided vertically and separated into a pair of wicks, and the combustion power can be adjusted over a wider range by selecting between using only one wick and using both wicks. A system that can be set is provided, which will be described in more detail with reference to FIGS. 2 and 3.
1 is a core guide tube, a burner basket 2 is arranged around the outer periphery of the core guide tube 1, and a lamp wick 3 is inserted into the gap between the core guide tube 1 and the burner basket 2. For example, the arc length of this wick 3 is 6:4.
It is vertically divided into a first core 3a having a larger ratio and a second core 3b having a smaller ratio. The first core body 3a is disposed at the front side of the liquid fuel combustion device, and the second core body 3b is disposed at the rear side, and each is supported so as to be able to move up and down independently along the core guide tube 1. .

The upper edge of the wick guide tube 1 is bent inward, and the upper edge of the burner basket 2 is bent outward in a step-like manner.The bent portions of these two form a fire tray 4, and the lamp wick 3 is inserted through the fire tray 4. A combustion tube 5 is removably mounted on the upper part of the combustion chamber. This combustion tube 5 is integrally composed of an inner flame tube 6 and an outer flame tube 7 arranged concentrically, an outer tube 8 facing the lower outer periphery of the outer flame tube 7, and a glass tube 9 also facing the upper outer periphery. The lower edges of the inner flame tube 6 and the outer flame tube 7 are fitted into the fire pan 4 and supported. The inner flame tube 6, the outer flame tube 7, and the outer tube 8 are integrally connected via cross pins 5a, 5a, and the glass tube 9 is connected to the outer tube 8 and the glass retainer 7a at the upper end of the outer flame tube 7. It is held in place by being held in place.

Partition plates 10 and 11 are interposed between the inner flame tube 6 and the outer flame tube 7, and these partition plates 10 and 1
1, the interior between the inner flame tube 6 and the outer flame tube 7 is a first combustion chamber 12a corresponding to the first core body 3a.
and a second combustion chamber 12 corresponding to the second core body 3b.
It is divided with b. Furthermore, inside the inner flame cylinder 6, this interior is connected to the first and second combustion chambers 12.
A partition plate 13 is provided which is divided into sections corresponding to the sections a and 12b. Inner flame tube 6 and outer flame tube 7
There are many ventilation holes 14..., 1 on the circumferential surface of each
5... are drilled, and these ventilation holes 14..., 1
Combustion air is supplied to each combustion chamber 12a, 12b through the combustion chambers 12a, 12b. In addition, 16
is a rectifying plate attached to the upper end of the outer flame tube.

However, during strong combustion, the first and second
The cores 3a, 3b are both protruded into the fire pan 4 and exposed to the respective combustion chambers 12a, 12b. In this state, the upper ends of each core 3a, 3b are ignited. Liquid fuel such as kerosene is vaporized from the upper ends of the bodies 3a, 3b, and this vaporized gas rises into each combustion chamber 12a, 12b and mixes with the combustion air flowing in from each ventilation hole 14..., 15... and burn. When the second core 3b is lowered from this state and its upper end is submerged below the fire pan 4, combustion in the second combustion chamber 12b based on this core 3b disappears, and the first core body 3a
Based on this, only combustion occurs in the first combustion chamber 12a, and the amount of combustion is reduced to approximately 1/2, switching to weak combustion. Of course, if combustion is started with only the first core body 3a protruding into the fire pan 4 at the start of combustion, weak combustion can be set from the beginning.

In this way, combustion power can be adjusted with large differences. However, when looking at the peripheral surface temperature of the outer flame tube 7 during weak combustion, it is naturally lower at approximately the half-circumferential portion corresponding to the second combustion chamber 12b in a non-combustion state, and
The boundary with the combustion chamber 12b, that is, the partition plate 10,1
An extreme temperature gradient occurs in the part where 1 is arranged, and a large thermal stress σ expressed by the following equation is applied to the material of the outer flame tube 7 in this part.

σ=E×ρ(T1−t2) In this formula, E: elastic modulus of the outer flame tube 7 ρ: Coefficient of thermal expansion of outer flame cylinder 7 T1−T2: Temperature difference of outer flame tube 7 It is.

Ferrite heat-resistant steel is usually used as the material for the outer flame tube 7 and the inner flame tube 8, but this type of material is characterized by low mechanical strength at high temperatures. In addition, especially in the outer flame tube 7, the glass tube 9
In order to increase the radiation effect on the glass tube 9, ventilation holes 15 are closely formed in the upper half portion facing the glass tube 9, so that the heat capacity is made as small as possible. Therefore, if a large thermal stress σ as described above is applied to a part of the outer flame tube 7, that part will be deformed, leading to damage or deterioration of combustion.

Therefore, measures are sometimes taken to prevent the generation of thermal stress by dividing the outer flame tube 7 into front and rear parts at the portions where the partition plates 10 and 11 are arranged. The structure is complicated and expensive, and the combustion force at the divided portions is reduced, resulting in insufficient red heat to the outer flame cylinder 7, resulting in a decrease in efficiency.

[Purpose of invention]

This idea was made with attention to these points, and its purpose is to have a simple configuration,
Another object of the present invention is to provide a liquid fuel combustion device that can prevent deformation of the outer flame cylinder due to thermal stress without substantially reducing efficiency.

[Summary of the idea]

In other words, this idea consists of dividing a cylindrical lamp wick in the vertical direction and cutting it into multiple wicks, which are arranged concentrically above the wick and each having a large number of ventilation holes perforated on its circumferential surface. A combustion tube including a flame tube and an outer flame tube is provided, a partition plate is interposed inside the inner flame tube and the outer flame tube, and this interior is divided into a plurality of combustion chambers corresponding to each of the core bodies. In a device in which the vaporized gas of liquid fuel vaporized from the core is combusted by partitioning the core and selectively facing its corresponding combustion chamber, the aperture ratio of the vent in the outer flame tube is determined by the partition. The part where the plate is placed is made smaller than the other parts.

[Example of idea]

An embodiment of this invention will be described below.
FIG. 1 shows a state in which the outer flame tube 7 is unfolded. Almost the lower half of the outer flame tube 7 is the combustion area a facing the outer tube 8 in FIG. 1, and the upper half is the glass tube 9.
In the radiant area b, which faces the Radiant heat is radiated into the cylinder 9. In the combustion zone a, the ventilation holes 15a are sparsely formed.
In the radiation region b, the ventilation holes 15b are closely spaced in order to suppress the heat capacity and increase the radiation effect. However, in the part where the partition plates 10 and 11 that partition the inside of the outer flame tube 7 into the first combustion chamber 12a and the second combustion chamber 12b are arranged, the ventilation holes 15b are sparse, The aperture ratio of these parts is smaller than that of other parts.

According to such a configuration, even if large thermal stress occurs in the portions where the partition plates 10 and 11 are arranged on the peripheral surface of the combustion tube 7 during weak combustion as described above, the aperture ratio of these portions is small; Its mechanical strength is strong, so it can withstand thermal stress well.
Deformation is prevented from occurring. The structure is not such that the outer flame cylinder 7 is divided, but simply the ventilation hole 15b...
Since the aperture ratio of the partition plates 10 and 11 is only reduced, it can be constructed easily and inexpensively.
There is almost no reduction in the red heat of the outer flame tube 7 in the area where the flame tube 7 is placed.

In addition, in the above embodiment, the partition plates 10, 1
Ventilation hole 15 of outer flame tube 7 in the part where 1 is arranged
Although the opening ratio is reduced by reducing the number of holes 15b, . . ., the opening ratio may be reduced by reducing the diameter of the ventilation holes 15b. In addition, separate reinforcing plates are attached to the outer flame tube 7 in advance by spot welding or the like in the areas where the partition plates 10 and 11 are arranged, and in this state, the opening ratio is smaller in these areas than in other areas. Stomata 1
5b... may be drilled. In such a case, the portion where thermal stress occurs is further reinforced by the reinforcing plate, so that deformation of the outer flame tube 7 can be further reliably prevented. Can be done. On the other hand, in the inner flame tube 6, the opening ratio of the ventilation holes 14 is small from the beginning, and therefore deformation due to thermal stress occurs much less than in the outer flame tube 7. Regarding the flame tube 6, the opening ratio of the ventilation holes 14 in the portions where the partition plates 10 and 11 are arranged may be made smaller than in other portions.
Furthermore, in the above embodiment, the lamp wick 3 is divided into two parts, but it is also possible to divide it into three or more parts so that the combustion power can be adjusted in multiple stages.

[Effect of idea]

As explained above, according to this invention, the opening ratio of the vent hole of the outer flame tube is made smaller in the part where the partition plate is placed than in other parts, which allows the deformation of the outer flame tube due to thermal stress. It is possible to reliably prevent this, and the outer flame tube can be made sufficiently red hot even in the part where the partition plate is arranged, so that a decrease in efficiency can be avoided.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an expanded outer flame tube according to an embodiment of the invention, FIG. 2 is a vertical sectional view of a liquid fuel combustion device, and FIG. 3 is a horizontal sectional view. 3... Light wick, 3a, 3b... Core body, 5... Combustion tube, 6... Inner flame tube, 7... Outer flame tube, 10, 11...
...Partition plate, 12a, 12b...Combustion chamber, 14,1
5, 15b...Vent hole.

Claims (1)

[Scope of utility model registration request] A cylindrical lamp wick is divided vertically and separated into multiple wick bodies, and an inner flame tube and an outer flame are arranged concentrically above the wick and each has a number of ventilation holes perforated on its circumferential surface. A combustion tube including a cylinder is provided, and a partition plate is interposed inside the inner flame tube and the outer flame tube to divide the inside into a plurality of combustion chambers corresponding to each of the cores, and each core is In a device that burns vaporized gas of liquid fuel vaporized from the core body by selectively facing its corresponding combustion chamber, the opening ratio of the vent hole in the outer flame tube is determined by the portion where the partition plate is arranged. A liquid fuel combustion device characterized in that it is smaller than other parts.