JPH0349002B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a combustor that achieves clean combustion and energy saving.

Conventional configurations and their problems Combustors that use a lighting wick as a fuel supply means are often used as household heaters such as kerosene stoves. However, most of them consist of cylindrical wicks and combustion tubes, so they are either installed in the center of the room or equipped with a reflector to redirect the radiant energy in one direction and direct the radiant energy toward the wall of the room. However, it had the disadvantage of requiring a large installation area due to its large depth. In order to overcome this drawback, a flat burner using a linear wick and incandescent plate has been proposed, but conventional burners have drawbacks such as a narrow adjustable range of combustion amount and poor radiation efficiency. There is.

A conventional planar burner is constructed as shown in FIG. That is, numeral 1 is a lamp wick whose lower end is immersed in the fuel in the fuel tank, although not shown in the figure, and whose upper end is exposed in the combustion chamber. 2 is a large number of small holes 2
A front perforated plate 3 is a rear perforated plate having a large number of small holes 3a, and a combustion chamber is formed in the gap between the front perforated plate 2 and the front perforated plate 2. Reference numeral 4 is an incandescent plate that is continuously installed on the front perforated plate 2 and is made of lath punched metal, wire mesh, etc.; 5 is a transparent plate made of a heat-resistant light-transmitting material such as glass; 6 is a front outer plate that covers the front surface; 7 is the rear skin covering the rear surface.

In the above configuration, the fuel gas vaporized from the tip of the lamp wick 1 in the steady combustion state is transferred to the small holes 2a, 3a of the front perforated plate 2 and the rear perforated plate 3 and to the incandescent body 4.
It mixes with the air supplied by natural draft through the opening of the combustion chamber, gradually burns, and is discharged from the top of the combustion chamber to the outside of the appliance. In this type of combustion method, the air is supplied in an extremely dispersed state (because it is supplied from small holes), so there is a large amount of unburned gas at the bottom of the combustion chamber, and as it moves toward the top, there is a large amount of unburned gas. The gas component becomes diluted, making complete combustion difficult. Therefore, complete combustion (2
(second combustion). According to the configuration of the conventional example, the air for secondary combustion is supplied from the opening of the incandescent body 4, so if air is supplied in a concentrated manner, only the incandescent plate in the vicinity becomes red hot, making it difficult to secure a wide incandescent area. This is not possible, and if air is supplied in a distributed manner to ensure a red-hot area, incomplete combustion will occur.
The drawback was that CO and odor were more likely to be generated, and it was not possible to simultaneously expand the red-hot area and reduce CO and odor. Furthermore, even if an appropriate air supply could be achieved at a constant combustion rate, adjusting the amount of fuel vaporized from the wick to adjust the combustion rate would disrupt the balance between air and fuel, making it impossible to obtain good combustion conditions. Nakatsuta.

Purpose of the invention The present invention solves these problems.
The purpose is to provide a combustor that secures a wide radiating area, generates little CO and odor due to uniform combustion, and allows a wide adjustment range of combustion amount.

Structure of the Invention In order to achieve this object, the present invention provides a rectifier plate which faces above the incandescent plate and reduces the amount of air flowing between the incandescent plate and the translucent plate in the lateral direction at the central portion and increases at both ends. It was established.

In the above configuration, by setting the secondary air supply position to an appropriate position, complete combustion is achieved by secondary combustion before the vaporized gas reaches a lean state when the combustion amount is low, and a strip-shaped lamp wick is provided. In a combustor, a good combustion state and a uniform red-hot state can be obtained by changing the distribution of the amount of air between the center and both ends of the combustion chamber in the lateral direction, which causes deterioration of combustion.

DESCRIPTION OF EMBODIMENTS Next, embodiments of the present invention will be described based on FIGS. 2 and 3.

In FIG. 2, reference numeral 1 denotes a linear lamp wick, the lower end of which is not shown in the figure, but immersed in the fuel in the fuel tank, and the upper end exposed in the combustion chamber. 2 is a front perforated plate having a large number of small holes 2a; 3 is a large number of small holes 3a;
This is a rear perforated plate having a rear perforated plate, and a combustion chamber is formed in the gap between the rear perforated plate and the front perforated plate 2. Reference numeral 4 denotes an incandescent plate which is arranged continuously on the front perforated plate 2 and is made of lath, punched metal, wire mesh, etc. The incandescent plate 4 may be integrated with the front perforated plate 2. Reference numeral 5 denotes a light-transmitting plate made of a light-transmitting material such as glass, which is provided to emit the radiant heat of the incandescent body 4 to the front side, 6 is a front outer plate that covers the front surface, 7 is a rear outer plate that covers the rear surface, and 8 is a rear outer plate. A partition plate is fixed to the outer panel and forms a secondary air port 9 in a gap with the upper end of the rear perforated plate 3, and 10 is a rectifying plate provided in the gap formed between the incandescent plate 4 and the transparent plate 5. be. The rectifying plate 10 is fixed at a position approximately in the middle of the height of the incandescent plate 4 and at approximately the same height as the partition plate 8, so that the longitudinal direction of the rectifying plate 10 is horizontal, so that air flows as shown in FIG. The substantial gap in the gap is narrow at the center in the transverse direction and wide at both ends.

In the above configuration, when the tip of the lamp wick 1 is ignited, the fuel is vaporized by the combustion heat and the air flow supplied by natural draft through the small holes at the bottom of the front perforated plate 2 and the rear perforated plate 3, It burns while mixing with air supplied from all the pores of the rear perforated plate 3 and the openings of the incandescent plate 4 below the partition plate 8. At this time, part of the vaporized gas vaporized from the lamp wick 1 is combusted by the air, and part of it is mixed gas (unburned gas).
The concentration of vaporized gas gradually decreases as the temperature rises. When the mixed gas reaches the vicinity of the secondary air port 9, air is intensively supplied and the gas is rapidly combusted, so that the combustion temperature rises and almost complete combustion occurs.

The exhaust gas after combustion rises along the top of the incandescent plate 4, heats the incandescent plate 4 to become red-hot, and converts the retained thermal energy into radiant energy. When the amount of vaporized gas is large (high combustion amount), combustion does not end near the secondary air port 9 and the flame length becomes long.
Since the flame rises while contacting the incandescent plate 4, mixing of the unburned gas and air in the flame is promoted by the local vortices, resulting in almost complete combustion.

Unlike a cylindrical combustor, a linear combustor has walls at both ends, so the draft at the center in the transverse direction, which is not affected by the walls, is stronger than at both ends. It has the property of being easy to concentrate on. As a result, the amount of vaporized gas at both ends of the combustion chamber is smaller than that at the center, resulting in an excess of air, which causes abnormal combustion that produces CO and odor, as well as low red heat temperature and uneven appearance. It gives rise to

During combustion, air is supplied into the combustion chamber formed by the gap between the front perforated plate 2 and the rear perforated plate 3. The air is supplied through the small holes 2a and 3a due to the pressure difference between the combustion chamber and the space formed by the gap between the rear perforated plate 3 and the rear outer plate 7, and the combustion chamber. In the gaps between the front perforated plate 2, the front outer plate 6, and the transparent plate 5, the pressure in the center of the gap is high because the upper part is closed by the rectifying plate 10, and the rectifying plate 10 is open at both ends. Because of this, air flows upward and the pressure decreases. Therefore, the pressure difference between the gap and the combustion chamber via the front perforated plate 2 is large at the center and small at both ends, and the amount of air supplied into the combustion chamber is large at the center and small at both ends.

As mentioned above, the amount of vaporized gas is large in the center of the combustion chamber and small in both ends. Therefore, in the structure of the present invention, the amount of air flowing above the incandescent plate 4 is small in the center in the lateral direction, and increases in both ends. By using a baffle plate whose aperture ratio is regulated, an amount of air corresponding to the amount of vaporization can be supplied to the combustion chamber.

As a method of changing the amount of air in the center and both ends, there is a method of reducing the aperture ratio of both ends of the incandescent plate 4, but this method is not preferred because it causes non-uniformity in appearance.

Further, the air flow flowing upward from the rectifying plate 10 creates an air layer between the red-hot plate 4 and the transparent plate 5. Furthermore, since the aperture ratio of the holes drilled in the incandescent plate 4 is larger than that of the front perforated plate 2, the fluid resistance is reduced and the flow velocity of the air flowing upward becomes correspondingly faster. Therefore, by this, the temperature rise of the light-transmitting plate 5 can be suppressed, devitrification can be prevented, and the durability of the light-transmitting plate 5 can also be improved.

FIG. 4 shows another embodiment of the current plate 10, in which the distance between the holes 10a in the center is larger than that on both sides.

Effects of the Invention As explained above, according to the present invention, the amount of air flowing above the incandescent plate is reduced in the lateral direction at a position approximately midway between the vertical height of the incandescent plate, and the amount of air is reduced in the center and increased in both ends. By providing the plate, the pressure difference between the gap between the transparent plate and the front perforated plate and the combustion chamber is large in the center and small at both ends, and the amount of air supplied into the combustion chamber from the small holes in the front perforated plate is reduced. (1) By providing a rectifying plate in the center of the incandescent plate, it can serve both to strengthen the incandescent plate, which is easily distorted by heat, and to have a rectifying effect. Therefore, the flatness of the incandescent plate is maintained over a long period of time, and the area of the incandescent plate can be increased, making it possible to ensure uniformity in the appearance of the glowing state and a wide glowing surface.

(2) Since the tip of the rear perforated plate and the secondary air supply position are located at the height of approximately the middle of the incandescent plate, the flame rises while contacting the incandescent plate after supplying the secondary air. Mixing of the unburned gas and air in the flame is locally promoted by the eddies, facilitating complete combustion.

(3) Preventing abnormal combustion due to excess air at both ends,
Low CO and odor.

(4) By forming a secondary combustion flame even when the amount of combustion is small, less CO and odor are generated, and the combustion amount can be adjusted over a wide range.

The following effects can be obtained.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a conventional example, FIG. 2 is a partially sectional perspective view of an embodiment of the present invention, and FIGS. 3 and 4 are perspective views of a rectifier plate of an embodiment of the present invention. 1... Light wick, 2... Front perforated plate, 3... Rear perforated plate, 4... Red-hot plate, 5... Translucent plate, 8... Partition plate, 9... Secondary air passage, 10... Rectification Board.

Claims (1)

[Claims] 1. A strip-shaped lamp wick, a front perforated plate provided on the front surface of the lamp wick and having a plurality of holes, a rear perforated plate provided on the rear surface of the lamp wick and having a plurality of holes and a secondary air passageway in the upper part; an incandescent plate provided on the upper part of the perforated plate and having a hole aperture ratio larger than that of the front perforated plate; a transparent plate that transmits radiant heat, and a height approximately at the same height as the secondary air passage at approximately the middle of the vertical height of the incandescent portion of the gap formed by the incandescent plate and the transparent plate; A combustor provided with a rectifier plate that controls the amount of air flowing through the center portion of the gap portion in a lateral direction to be smaller and the amount of air flowing through the both ends portions to be larger.