JPH079284B2 - Combustion device - Google Patents

Description

Description: (a) Field of Industrial Application The present invention relates to a wick type combustion device used for an oil stove or the like, and more particularly to a combustion device capable of increasing a combustion amount adjustment range.

(B) Conventional Technology Conventionally, as a combustion apparatus of this type, for example, Japanese Patent Laid-Open No. 62-218
As disclosed in Japanese Patent No. 704, an inner flame cylinder is provided at an inner space of an outer flame cylinder having a red-heated portion formed at an upper portion thereof, and the diameter of the upper portion of the inner flame cylinder is smaller than that of the lower portion thereof. There is known a combustion apparatus in which the combustion amount adjusting width is widened by making the space between both the inner and outer flame cylinders large at the upper part.

(C) Problems to be Solved by the Invention In the above-described conventional combustion apparatus, since the passage resistance in the combustion chamber rapidly changes at the large interval above the combustion chamber,
At the time of normal strong combustion, the flow of the combustion gas rising at the boundary with the large gap portion is disturbed, and the combustion becomes unstable, resulting in red hot unevenness in the red hot portion.

The present invention has been made in view of the above-mentioned problems, and it is possible to obtain a stable combustion state over a wide range from normal strong combustion to weak combustion, and to further suppress unburned gas from being directly emitted into the atmosphere. The purpose is to do so.

(D) Means for Solving the Problems The present invention is directed to an inner flame cylinder having a large number of ventilation holes, an outer flame cylinder having a large number of ventilation holes arranged outside the inner flame cylinder, and the outer flame. In a combustion device comprising an outer cylinder arranged outside the cylinder and a wick provided at a lower end of a combustion chamber formed between the inner and outer flame cylinders and vertically movable, the inner flame cylinder is truncated frustoconical. On the other hand, while having a shape, an air control plate and a rectifying cylinder extending above the air control plate are incorporated therein, and a space formed between the rectifying cylinder and the internal flame cylinder is provided with the air control plate. This is a configuration in which combustion air is introduced through air holes.

(E) Action The internal flame tube (6) is frustoconical in shape, so that the passage resistance of the combustion chamber (A) does not suddenly change from the middle, and combustion that rises in the combustion chamber (A) It is possible to prevent turbulence of the gas flow, and to obtain a stable combustion state over a wide range from normal strong combustion to weak combustion, while expanding the combustion control range. In addition, the air control plate (18) and the rectifying cylinder (19) are installed inside the frustoconical internal flame cylinder (6), and between the rectifying cylinder (19) and the internal flame cylinder (6). Forming a space (D) with higher passage resistance in the upper part than in the lower part,
By introducing the combustion air into the space (D) through the air holes (20) of the air control plate (18), the unburned gas leaking into the space (D) is mixed with the combustion air to mix the combustion chamber. It can be supplied to (A), and the unburned gas can be further suppressed from being directly released into the atmosphere during combustion.

(F) Example An example of the present invention will be described below with reference to FIGS. 1 to 4.

In the figure, (1) is a wick that sucks up fuel such as kerosene, which is vertically movably provided in a gap formed by an air supply tube (2) and a core frame (3) outside the air supply tube (2). A vertical movement operation can be performed by (not shown). An inner fire tray portion (4) and an outer fire tray portion (5) are formed on the upper ends of the air supply cylinder (2) and the core frame (3), respectively.
An inner flame tube (6) is placed on the inner fire tray part (4), and an outer flame tube (7) placed outside the inner flame tube (6) is placed on the outer fire tray part (5). It is placed. And, at the lower end of the combustion chamber (A) formed between the inner and outer flame cylinders (6) and (7),
The upper end of the wick (1) is exposed during combustion. Outside the outer flame cylinder (7), there is a space between it and the upper outer cylinder (8).
The outer cylinder (8) composed of A) and the lower outer cylinder (8B) is arranged, and the inner flame cylinder (6), the outer flame cylinder (7) and the lower outer cylinder (8B) are
A combustion pin (10) is formed by being concentrically connected by a cross pin (9). A large number of ventilation holes (11) (11) of about 1.3 mmφ to 1.6 mmφ are formed in substantially the entire area of the inner flame cylinder (6) and the lower part of the outer flame cylinder (7), and the inner flame cylinder (6) The inside of is an inner air passage (B) through which the air from the air supply cylinder (2) passes. Further, the inner flame cylinder (6) is formed in a truncated cone shape so that the diameter thereof gradually decreases from the lower end portion to the upper end portion, and the inner flame cylinder is formed in this truncated cone shape. By (6), both inner and outer flame cylinders (6) (7)
The interval (T) between them gradually increases from the lower part to the upper part. (12) is an inner flame canopy that closes the upper end opening of the inner flame cylinder (6), and its central portion is upwardly protruded (12A) with a large number of passages through which air in the inner air passageway (B) is passed. Holes (13)
(13) ... is provided. (14) is the internal flame canopy (12)
It is a trumpet-shaped flame spreading plate attached to the central part of the upper surface of the above, and serves to guide the air rising from the through holes (13) (13) to above the combustion chamber (A). Also, the lower outer cylinder (8B)
The upper end of is bent inward to form an air control part (15), and the outer flame cylinder (7) located above the air control part (15) has a lower air hole (11) than the lower vent hole (11). A large number (3.8 mmφ in the example) of a large number of through holes (16) (16) are bored,
A red heating part (7A) is formed in the upper part of the outer flame tube (7). (C) is an outer air passage formed between the outer flame cylinder (7) and the outer cylinder (8), and (17) is a ring-shaped outer canopy that closes the upper end of the outer air passage (C), The outer air passage (C) has a large number of air holes (17A) through which the air can pass, and the outer edge of the outer canopy (17) is located above the air control section (15) of the lower outer cylinder (8B). It holds the upper end of a heat-resistant glass cylinder as an upper outer cylinder (8A) placed on the. In addition, a ring-shaped air control plate (18) and a cylindrical rectifying cylinder (19) extending above the air control plate (18) are incorporated inside the inner flame cylinder (6). , And this rectifier (1
Space (D) formed between 9) and the inner flame tube (6)
Includes a large number of air holes (20) (2) in the air control plate (18).
Combustion air is introduced via 0). The air control plate (18) is arranged below the inside of the inner flame tube (6), and as shown in FIG. 4, the air hole (20) is provided outside the large-diameter air hole (21) provided in the central portion thereof. ) (20) is provided in a ring. As shown in FIG. 3, the straightening cylinder (19) has a plurality of (four in the embodiment) support legs (22) at the lower part thereof.
(22) is provided to open between the support legs (22) and (22), and is fixed to the air control plate (18) by a locking claw (23) provided at the lower end of the support leg (22). (24) and (24) are holes through which the cross pin (9) passes.

In the above structure, during normal strong combustion, the flame (FX) is formed above the upper end of the combustion chamber (A) as shown by the chain double-dashed line in FIG. 2, and combustion with good exhaust gas characteristics can be maintained.
Next, if the exposed height of the wick (1) is lowered to make the combustion amount about 35 to 40% lower than the normal strong combustion, the combustion is weakly burned.
The flame (FX) gradually becomes lower, and as shown by the solid line in FIG. 2, a flame (FY) that has entered the combustion chamber (A) is formed and combustion is continued. At the time of this weak combustion, as shown by the broken line arrow (a) in FIG. 2, the unburned gas leaked from the through hole (16) in the lower part of the red heat part (7A) to the outside air passage (C) is Since the through-hole (16) of the red heat part (7A) of the outer flame tube (7) is largely opened, it reflows into the combustion chamber (A) near the tip of the flame (FY) from this through-hole (16). Then
At that time, it is burned by a flame (FY) and then released into the atmosphere.

On the other hand, as shown by the arrow (b) in FIG. 2, the lower outer cylinder (8
B) A small amount of unburned gas leaks into the inside of the inner flame tube (6) through the ventilation hole (11) at a height position substantially corresponding to the air control section (15) at the upper end. The slightly leaked unburned gas mixes with the combustion air introduced through the air hole (20) in the air (D) between the inner flame cylinder (6) and the rectifying cylinder (19), Ascend in the space (D). At this time, the passage resistance of the space (D) gradually increases from the lower part to the upper part, and the unburned gas and the combustion air rise in the space (D) from the ventilation hole (11) to the combustion chamber. It is supplied to (A), and after being burned by a flame (FY), it is released into the atmosphere.

According to the above-mentioned embodiment, by making the inner flame tube (6) into the truncated cone shape, the passage resistance of the combustion chamber (A) can be gradually reduced from the lower part to the upper part, and the combustion chamber (A) can be reduced. The passage resistance of does not change suddenly from the middle, and the turbulence of the combustion gas flow rising in the combustion chamber (A) can be prevented.
Almost all unburned gas leaking to the outside air passage (C) is re-injected into the combustion chamber (A) and burned even during weak combustion in which the combustion amount is reduced by 35-40% from normal strong combustion. Therefore, the combustion control range can be expanded, and a stable combustion state can be obtained over a wide range from normal strong combustion to weak combustion.

In addition, an air control plate (18) and a rectifying cylinder (19) extending above the air controlling plate (18) are incorporated in the inner flame cylinder (6) having a truncated cone shape. Since the combustion air is introduced into the space (D) formed between the (19) and the inner flame tube (6) through the air hole (20) of the air control plate (18), the space As shown in FIG. 2, (D) is formed so that the passage resistance of the upper part is larger than that of the lower part thereof. Therefore, the unburned gas leaked to this space (D) is Since the combustion air introduced through the air hole (20) of 18) is sufficiently mixed in this space (D) and is supplied to the combustion chamber (A) near the upper part of the flow straightening cylinder (19), It is possible to further prevent the combustion gas from being directly emitted into the atmosphere.

(G) Effect of the Invention Since the combustion apparatus according to the present invention is configured as described above, it is possible to prevent most of the unburned gas leaked from the combustion chamber during weak combustion from being directly discharged into the atmosphere. The combustion adjustment range can be expanded, the passage resistance of the combustion chamber does not suddenly change from the middle, and the turbulence of the combustion gas flow rising in the combustion chamber is prevented, and a wide range of normal strong combustion to weak combustion is achieved. A stable combustion can be obtained, and a good combustion device with less uneven red heat can be provided. Further, between the inner flame cylinder and the rectifying cylinder, a space with a larger passage resistance is formed in the upper part than in the lower part, and the unburned gas leaking into this space is mixed with the combustion air to be supplied to the combustion chamber. Therefore, it is possible to further suppress the direct release of unburned gas into the atmosphere, obtain good exhaust gas characteristics, and further expand the combustion control range.

[Brief description of drawings]

1 to 4 show an embodiment of the present invention,
FIG. 1 is a front view of a half section of the combustion device, FIG. 2 is a half cross section of the combustion device in a weak combustion state, FIG. 3 is a front view of the rectifying cylinder and the air control plate, and FIG. It is an AA 'sectional view of a figure. (1) ...... wick, (6) …… inner flame cylinder, (7) …… outer flame cylinder, (8) …… outer cylinder, (11) (11) …… vent hole, (18)
...... Air control plate, (19) …… Rectifier, (20) (20) ……
Air holes.

Claims (1)

[Claims] 1. An inner flame cylinder having a large number of ventilation holes, and an outer flame cylinder having a large number of ventilation holes arranged outside the inner flame cylinder,
In a combustion device including an outer cylinder arranged outside the outer flame cylinder and a wick vertically movable at a lower end of a combustion chamber formed between the inner and outer flame cylinders, the inner flame cylinder is cut off. While having a frustoconical shape, an air control plate and a rectifying cylinder extending above the air control plate are incorporated therein, and the air is provided in a space formed between the rectifying cylinder and the internal flame cylinder. A combustion device characterized in that combustion air is introduced through an air hole of a control plate.