JPS6365853B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a combustion radiation stove that can provide uniform and high temperature radiation over the entire surface of the heat radiation section.

[Prior art]

This type of traditional stove belongs to the oil stove,
For example, the one that is commonly used is
Although disclosed in Japanese Patent No. 44277 and shown schematically in FIG. 5, only radiation heat transfer from the catalyst layer 21 as an inner cylinder disposed above the combustion section 4' in the combustion cylinder 5' is possible. heat exchange by the combustion tube 5'
Due to the active natural heat radiation from the surface to the surrounding air, the surface temperature of the combustion cylinder 5', which is the outer cylinder, is low, and therefore the amount of radiant heat radiation is small, and the heat transfer distance is short. That was the problem. On the other hand, as shown schematically in Figure 5 A and B, in a forced air supply/exhaust kerosene stove, the surface of the combustion tube 5'' naturally radiates heat to the surrounding air, and the flame in the combustion section 4'' Due to the unevenness of the combustion gas flow, it is difficult to heat the surface uniformly, so there are many areas where the surface temperature is as low as about 400 to 500℃, and the distance that the radiant heat reaches For example, the temperature range of 40 degrees Celsius is at most 1 to 1.5 meters away. Furthermore, in the case shown in Fig. 6A, the entire surface of the combustion tube 5'' is made of a metal plate that does not transmit light, and the surface is simply coated with a heat-resistant coating, so it is effective in collecting heat from the human body. On the other hand, in the case shown in Fig. 6(b), the side periphery of the skeleton 22, which is heated by the flame, is covered with a heat-resistant transparent glass tube. However, since heat-resistant glass is difficult to transmit far-infrared rays that are effective for warming the human body, even if the red-hot part can be seen from an external force, it is only a visual effect. This device is only slightly different from the device shown in Figure A.

[Purpose of the invention]

In response to the fact that the conventional combustion radiation stoves of this type have various defects, the present invention has been made to eliminate the above-mentioned defects. The main purpose is to improve heating efficiency by uniformly obtaining a large amount of high-temperature radiation over the entire surface.

[Structure of the invention]

However, in the present invention, in particular, small diameter portions and large diameter portions are arranged alternately and vertically, a sloped portion is continuous between the small diameter portion and the large diameter portion, and small holes for releasing combustion gas are provided. The radiant heat radiation part of the combustion cylinder in the combustion radiant stove is formed by the corrugated cylinders provided dispersedly on the slope part, and the small holes are close to the burner part when comparing the total hole area in each slope part. The lower side is smaller, and the two sides are located on both sides of the small diameter part and face each other on the concave side of the combustion tube, and the two sides are located on both sides of the large diameter part and face each other on the side of the convex part of the combustion tube. It is characterized by a structure in which the small holes are arranged in a staggered arrangement, and the combustion gas is released evenly from each small hole, which improves contact heat transfer and at the same time reduces the impact on the surrounding air. It is possible to reduce natural heat radiation, and in particular, by arranging the small holes in a staggered arrangement between opposing sides on the concave side of the combustion tube, the blown combustion gas is blown onto the opposing slopes. This promotes the accumulation of high-temperature gas in the concave portion, which promotes the high-temperature retention effect of the radiation heat dissipation section in the combustion tube. By arranging the arrangement in such a way that the combustion gas flows in the combustion cylinder evenly and the contact heat transfer effect is further promoted, the amount of radiated heat increases overall. The intended purpose has been fully achieved.

【Example】

Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying drawings. 1 and 2 illustrate an oil stove equipped with a gasification burner 3 among combustion radiation stoves. It also includes stoves and gas stoves equipped with gas burners. The illustrated kerosene stove includes a pedestal 1 that also serves as an oil tank, a burner cover 2, a gasification burner 3, a safety guard 4, a combustion tube 5, and a top plate 10, and in the case of a reflective type, a reflector plate 11.

[Dotted line] is added. The gasification burner 3 collects oil stored in the oil tank of the mount 1.

[Kerosene] is pumped up by an electromagnetic pump 13 through a filter 12 and sent into a pump chamber 15, and further sent to a vaporizer 16 by a pump in the pump chamber 15, where it is diffused into a mist, and the motor 1
4 through a fan 17 energized by the carburetor 16.
After mixing the air sent into the tank and the atomized oil, the mixture is combusted to form an upright combustion tube 5.
The flame can be ejected into the combustion tube 5 vigorously and with a long flame from the burner nozzle facing the center of the lower part of the burner. The surrounding body of the combustion tube 5 is formed of a corrugated tube, which serves as a radiation heat radiation section, and is connected to the upper part of the gasification burner 3 so as to surround the burner nozzle. As shown in an enlarged view in FIG. 3, this combustion tube 5 has small diameter portions 6 and large diameter portions 7 arranged alternately in the vertical direction, and small holes 9, 9 for releasing combustion gas are dispersed. The slope portion 8 having the same shape as the small diameter portion 6
and the large-diameter portion 7, and is formed into a round or polygonal tube. Then, the top of the cylinder is sealed with a heat insulating top plate formed by sandwiching the heat insulating material 18 between a heat shield plate 19 and a top plate 20 in a sandwich shape, while the gap between the lower end and the burner flame holding plate is treated with insulation, although not shown. The structure is designed to reduce heat dissipation to the lower part. The small holes 9, 9, . The gas 9,
By appropriately increasing or decreasing the total area of the holes in each slope portion 8, 8, small holes are formed that are commensurate with the gas flow loss in the combustion tube 5. It can be an array. As a means of increasing or decreasing the hole area as described above, increasing or decreasing the number of small holes 9, 9, etc. having the same diameter,
This can be easily done by making the same number of holes for each slope part 8, 8... and adjusting the size of the holes.
Each slope portion 8, 8... is divided into several upper and lower groups such as upper, middle, and lower, and small holes 9, 9... are divided into groups.
It is a preferred embodiment to vary the total pore area of the pores. In addition, in practical terms, the slope portions 8, 8 are approximately 1/3 of the total height on the top side of the combustion tube 5.
As a result of experiments, it has become clear that the purpose can be achieved by making the hole area of the small holes 9, 9 provided in the groove twice as large as the hole area of the slope portions 8, 8 in the other portions. Furthermore, the small holes 9, 9 are located in the sloped portions 8, 8 on both sides sandwiching the small diameter portion 6, and are not vertically opposed to each other on the concave side of the combustion tube 5, but are spaced apart from each other. They are arranged in a staggered arrangement, and the high-temperature gas airflows blown out from the upper small holes 9 and the lower small holes 9 cross each other, and after each blows against the slope portion 8 of the other side. , so as to allow turbulent diffusion. In this way, in order to ensure that the high-temperature gas flow blown out from the small holes 9 hits the opposing slope portion 8, the small holes 9, 9 are arranged along the center line extending in the circumferential direction of the slope portion 8. If provided, the small diameter portion 6
The large diameter part 7 is based on the radius difference △r between the large diameter part 7 and the large diameter part 7.
It is sufficient that the pitch P is 1.0 to 2.5×Δr, and the intersecting angle θ of the slope portions 8 facing each other on the inside of the cylinder is 10 to 50°. Further, the small holes 9, 9 are arranged on both sides of the large diameter portion 7 and facing each other on the convex side of the combustion tube 5, but are not aligned vertically but are arranged in a staggered manner. With this arrangement, the high-temperature combustion gas flow in the combustion tube 5 blown out from the upper small hole 9 and the lower small hole 9, respectively, has a gas flow layer. They are not the same, but are adjacent to each other. In the stove equipped with the combustion tube 5 having the above-described configuration, when the gasification burner 3 is operated for combustion while supplying heat, the entire circumference of the combustion tube 5 is red-hot by the high-temperature combustion gas rising from the burner flame opening. It gets hot. At this time, as shown in FIGS. 3 and 4, combustion gas is released around the combustion tube 5 through the small holes 9, 9, but inside the combustion tube 5, the upper small hole 9 and the lower small hole Since the holes 9 are arranged in a staggered pattern,
As a result, the flow layer in which the combustion gas rises along the inner wall of the combustion tube 5 becomes uniform, and the surface of the combustion tube 5 becomes almost uniformly high in temperature due to heat transfer through contact and conduction.
The amount of heat radiated increases. On the other hand, on the outside of the combustion tube 5, the small holes 9 on the upper stage and the small holes 9 on the lower stage are similarly arranged in a staggered arrangement, so that the gas released from these small holes 9, 9 into the recesses of the corrugated surface After blowing against the opposing slope part 8, the gas diffuses turbulently, and the high-temperature gas accumulates in the recess and forms a film in contact with the outside air, causing the surface of the combustion tube 5 to become in a high-temperature gas atmosphere. resides within,
In addition, since it is no longer affected by the cooling effect of outside air, the temperature becomes uniformly high and the amount of heat radiated increases. The effect exerted by the combustion tube 5 is as described above, but after sandblasting the outer surface of the heat-resistant steel plate of the combustion tube 5, the ceramic thin layer is coated or sprayed with ceramic. It is preferable to manufacture the heating element from a surface-treated steel sheet, which improves the radiation efficiency of far-infrared rays, has a large heat transfer distance, and further improves the heating performance. Furthermore, unlike the above example, even if the combustion tube 5 is made of a heat-resistant steel plate with an oxide film formed on the outer surface after sandblasting, it is possible to increase the radiation efficiency of far infrared rays. Another practical advantage is that the material cost can be reduced compared to the above-mentioned example having a layer on the surface.

【Effect of the invention】

Next, the effects of the present invention will be described as follows. (b) The gas released from the small holes 9, 9 into the recesses in the corrugated surface of the combustion tube 5 is transferred to the opposing sloped surface 8.
Since the gas blows onto the surface and diffuses along the slope part 8, the high-temperature gas tends to accumulate in the concave part, and this forms a barrier film with the outside air, so that the surface is in a high-temperature gas atmosphere and is exposed to the outside air. Since it is not cooled, the surface temperature becomes higher,
Furthermore, since the radiation efficiency is increased by the mutual reflection of the slope portions 8 in the recessed portions, the amount of radiation heat is increased, and with the same heating capacity, the height dimension can be reduced and a compact structure can be achieved. (b) Inside the convex part on the corrugated back surface of the combustion tube 5, the upper small holes 9 and the lower small holes 9 are arranged in a staggered manner, so that the high temperature gas rising along the cylinder wall flows uniformly. As a result, the wall surface is almost uniformly heated to a high temperature due to heat transfer through contact and conduction, further increasing the amount of heat radiated. (c) Even if the high-temperature gas blowing out from the small holes 9, 9 directly hits the opposing slope portion 8, it diffuses and is heated uniformly, so there is no risk of local overheating, and the surface treatment agent does not evaporate or deteriorate. It is expected to prevent this and improve durability. (d) Since the surface temperature of the combustion tube 5 is high, the distance that the radiant heat reaches is longer.
It becomes possible to maintain the temperature at 600°C and extend the 40°C temperature range to 1.5 to 2 meters, providing effective heating for the human body.

[Brief explanation of drawings]

1 and 2 are a partially sectional front view and a plan view taken along the - arrow line in FIG. 1 according to an embodiment of the present invention, and FIG. 3 is a partially enlarged view of the combustion tube in FIG. 1. 4 are exploded views showing essential parts of a combustion tube according to the present invention, and FIGS. 5 and 6 are schematic front views of each example of a conventional stove. 3...Burner part, 5...Combustion cylinder, 6...Small diameter part, 7...Large diameter part, 8...Slope part, 9...Small hole.

Claims (1)

[Claims] 1. The small diameter portions 6 and the large diameter portions 7 are arranged alternately and vertically, and the slope portion 8 is continuous between the small diameter portions 6 and the large diameter portions 7, and is used for releasing combustion gas. The small holes 9, 9 are formed in the sloping portion 8 by a corrugated cylinder, which forms the radiating heat radiation portion of the combustion tube 5. Comparing the total hole area, the lower side near the burner part 3 is smaller;
Either between the two sides that sandwich the small diameter part 6 and face each other on the concave side of the combustion tube 5, and the one that exists on both sides that sandwich the large diameter part 7 and face each other on the convex side of the combustion tube 5. A combustion radiation stove characterized by being arranged in a staggered arrangement with different shapes. 2. The small holes 9, 9 for releasing combustion gas are arranged on each slope part 8, 8 with a hole diameter and number of holes suitable for the combustion gas input.
A combustion radiation stove according to claim 1, which is provided in a combustion radiation stove. 3. The combustion according to claim 1 or 2, wherein the radiation heat dissipation part of the combustion tube 5 formed by a corrugated tube is made of a surface-treated steel plate having a thin ceramic layer adhered to the outer surface of a heat-resistant steel plate. Radiation stove. 4. The combustion radiation stove according to claim 1 or 2, wherein the radiation heat radiation part of the combustion tube 5 formed by a corrugated cylinder is made of a heat-resistant steel plate having an oxide film on its outer surface.