JPS6099912A - Linear combustion appliance - Google Patents

Abstract

PURPOSE:To provide a linear combustion appliance having a stable and superior combustion characteristic by a method wherein some slits having such a shape of three dimensional components in a vertical axis and a horizontal axis in an opening are arranged in combustion plates having several small air holes therein. CONSTITUTION:A front lower combustion plate 7 is provided with several small air holes 71 and slits 72 and a front upper combustion plate 8 is provided with several small air holes 81 and slits 82. At a part of low temperature indicated by a dotted line, slits 72 and 82 are not provided. Each of the slits 72 and 82 is arranged in its slant direction, that is, shaped to include a two-dimensional component of a vertical axis and a horizontal axis of an opening. Due to arrangement of some slits having a shape of two-dimensional components in a direction of inclination, i.e. a vertical axis and a horizontal axis in an opening, no partial difference in volume of supplied air is produced, optimal volume of air can be supplied to all the parts. Even if any deformations are found in the unit, the cause of deformations is accommodated in the clearances in the slits, thereby it is possible to eliminate completely the disadvantages of deformation which are specific to the linear combustion unit.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to improvements in linear combustors used for heating and other applications.

Conventional structure and problems Conventionally, in this type of combustor, the combustion plate is heated to a high temperature during combustion and deforms due to thermal stress and thermal expansion, and structural changes due to deformation are caused by combustion. This has the drawback of deteriorating the quality of fuel and causing incomplete combustion, resulting in the emission of a large amount of bad odor and harmful gases.

One of the methods proposed to improve these drawbacks is to provide several vertical cuts in the combustion plate, and use these cuts to absorb thermal stress and thermal expansion caused by combustion. Although this method is effective in applying heat from combustion and absorbing thermal expansion, it causes the airflow to become thick and thin, which adversely affects the combustion itself, resulting in bad odors, soot, and This has the drawback of producing harmful gases, etc.

Furthermore, the causes of characteristic deformation in a linear combustor are as follows. For example, if the combustion plate is made of 5TJS430 and the planar combustion plate is fixed at both ends, and the temperature rise of the combustion plate due to combustion causes a temperature difference of 400"C between the fixed part and the fixed part. The length of the combustion plate is 200171+
It will be 8 gifts. Therefore, if we consider that the combustion plate deforms into an arc shape, the straight line (20 ohm = ) connecting the fixed parts at both ends,
The maximum distance between the circular arc (2o0.8M) passing through both end fixing parts is 7.8 meters. In other words, a kind of width increase phenomenon occurs in which a slight difference in the lengths of O and Bwyn appears as a deformation slope of 7.8 degrees in the perpendicular direction. On the other hand, in a cylindrical combustor, the circumference increases from 200 m to 200.8 m, and the diameter only changes at the same rate, so the widening phenomenon that occurs in a linear combustor does not occur.

On the other hand, since the temperature difference between the inside (combustion chamber side) and the outside of the combustion plate is such that the inside is inevitably warmer than the outside, the above deformation occurs inward.

ShimaNen: This kind of deformation is repeated during combustion and extinguishing, resulting in permanent deformation.

Next, the disadvantages of the conventional method of providing only one-dimensional notches in the longitudinal direction, that is, the vertical direction, in the combustion plate will be explained in more detail as follows. The flow direction of gas in the combustion chamber of this type of combustor moves vertically from the bottom to the top, but in this case, the air supplied to the combustion chamber from the vertical notch is a side flow of the notch. The supply will be concentrated in certain areas. On the other hand, for a flow that does not match the notch, air is simply supplied from the small pores of the combustion plate, so a significantly smaller amount of air is supplied to the notch compared to the flow that does not match the notch. If the air supply amount is designed to be the optimum amount for a flow that does not match the notch, it is inevitable that an extremely excessive amount of air will be supplied for a flow that does not match the notch. Such an abnormal deviation in the amount of air supplied may occur in the design, regardless of whether the design is designed so that the optimum amount is supplied to the flow in the notch, or the optimum amount is supplied as the total amount in the combustion chamber. This is an essential problem that cannot be solved even by design.

The above-mentioned large deviations in the partial air supply amount naturally lead to partial malfunctions in the combustion state, resulting in unburned gas being discharged in the air-deficient areas, and abnormally active activity in the relatively lower part of the air-excess areas. As a result, the fuel in the adjacent air-deficient part is thermally decomposed in an oxygen-deficient state, generating a large amount of soot, and the relatively upper part cools the flame in the final stage of combustion by supplying excess air. This has the disadvantage of emitting a large amount of harmful components such as carbon oxide poison and malodorous components.

OBJECTS OF THE INVENTION It is an object of the present invention to eliminate the above-mentioned drawbacks and provide a linear combustor having stable and high-quality combustion characteristics.

Structure of the Invention The present invention is characterized in that a combustion plate having a large number of small pores is provided with a slit having a three-dimensional component of a vertical axis and a horizontal axis in the frontage direction.

DESCRIPTION OF EMBODIMENTS In FIG. 1, 1 is a fuel tank, 2 is a wick guide tube, 3 is a lamp wick, 4 is a saucer part forming a part of the wick guide tube, 5 is an outer plate, 6
7 is a front lower combustion plate, 8 is a front upper combustion plate, 9 is a rear combustion plate, 1o is a rear outer plate, 11 is a combustion chamber, and 12 is an exhaust port.

In operation of the combustor shown in FIG. 1, the lamp wick 3 is first placed in the position shown in FIG. 1, and is ignited by an igniter (not shown) to bring it into a combustion state. By combustion, at least a portion of each combustion plate 7, 8.9 is heated to a high temperature.

Next, when extinguishing the fire, the lamp wick 3 is lowered and the tip end is pulled into the sliding part of the wick guide tube 2 to extinguish the fire.

Note that the arrows in Figure 1 indicate the direction of air flow, and the dotted lines indicate the direction of each combustion plate 7, 8, 9 during combustion.
This figure shows the part that is kept at a relatively low temperature.

Next, FIG. 2 is a partial view showing the surfaces of the front lower combustion plate 7 and the front upper combustion plate 8 facing the combustion chamber 11.

As seen here, the front lower combustion plate 7 is provided with a large number of small pores 71 and slits 72, and the front upper combustion plate 8 is provided with a large number of small pores 81 and slits 82, so that the two-dimensional component of the horizontal axis is The inclusion of a hole in a shape that includes the structure is a feature of the structure. Furthermore, although a detailed view of the partial combustion plate 9 is not shown, the concept is similar to that of FIG. 2.

In the present invention, since the slit is provided with a two-dimensional component in the diagonal direction, that is, the vertical axis and the horizontal axis in the frontage direction, it is optimal for all parts without causing local deviations in air supply amount as in the conventional example. By being able to supply an amount of air and absorbing the cause of deformation into the gap between the slits, it is possible to completely eliminate the deformation defects peculiar to linear combustors.

Although the example shows a linear oblique slit,
Various shapes are possible, such as a meandering curved shape that combines multiple straight lines, and the key is to properly create a slit in the combustion plate that has a two-dimensional component of a vertical axis and a horizontal axis in the frontage direction. By arranging it, the essence of the book 'IE'U can be realized. Note that the horizontal axis component in the depth direction can be freely selected depending on the necessity for cutting the combustion plate itself.

Effects of the Invention In the present invention, even in a linear combustor, the expansion of the material due to heating is absorbed and the air flow is improved.

Since the combustion gas flow is averaged, good combustion conditions can be obtained.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of a linear combustor according to an embodiment of the present invention;
FIG. 2 is a partial view of the front lower combustion plate and the front upper combustion plate shown in FIG. 1 on their surfaces facing the combustion chamber. 7.9... Combustion plate, 71, 81... Small pore, 72°82... Slit, 11...
・Combustion chamber. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2

Claims (1)

[Claims] Flat-shaped combustion plates having a large number of small pores are opposed to each other through a combustion chamber, and a fuel supply part is provided at the lower end of the combustion chamber and a discharge part is provided at the upper end. A linear combustor characterized by providing a slit having a two-dimensional horizontal axis component.