JPH0260923B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an oil combustor using a straight wick and a combustion tube.

Conventional structure and its problems Oil burners using a straight wick and combustion tube are suitable as home heaters because of their short depth and small installation space indoors, but they are not stable from ignition. The drawbacks were that the start-up process leading to combustion took a long time and had a strong odor.

This is because after the flame ignites at the tip of the wick and spreads along the entire length of the wick, the flame concentrates in the longitudinal center where the passage resistance is lowest, which delays the temperature rise near both ends of the wick and generates more vaporized gas. This is because it takes a long time to reach the amount of vaporized gas generated during stable combustion, and because the vaporized gas is temporarily concentrated in the center, resulting in a partial air shortage and incomplete combustion.

OBJECT OF THE INVENTION The present invention eliminates these drawbacks and provides a compact combustor that has a short rise time, produces less odor and toxic CO, and provides uniform combustion over the entire length of the wick. The purpose is to

Structure of the Invention In order to achieve this object, the present invention has a structure in which small holes having a larger diameter than other parts are provided near both ends of the lamp wick of a perforated plate.

In the above configuration, when the tip of the wick is ignited and the flame propagates along the entire length of the wick, a flame is formed in the small holes with a large diameter near both ends of the wick in the perforated plate (flame holding).
This promotes temperature rise at both ends of the wick, increases the rate of vaporization rise, suppresses concentration of flame in the center, and shortens combustion rise time.

DESCRIPTION OF EMBODIMENTS Next, embodiments of the present invention will be described based on FIGS. 1 and 2.

In Fig. 1, reference numeral 1 denotes a lamp wick, which is not shown in the figure, but its lower end is immersed in the fuel in the fuel tank, and its upper part is exposed in the combustion chamber. Reference numeral 2 designates a front perforated plate having a large number of small holes 2a, and numeral 3 designates a rear perforated plate having a large number of small holes 3a.A combustion chamber is formed in the gap between the front perforated plate 2 and the front perforated plate. Reference numeral 4 denotes an incandescent plate provided continuously on the front perforated plate 2, and the incandescent plate 4 may be integrated with the front perforated plate 2. Reference numeral 5 denotes a transparent body provided to emit radiant heat generated from the incandescent plate 4 to the front, and is made of a light-transmissive material such as glass. 6 is the anterior external body that covers the front surface;
7 is a rear outer body that covers the rear surface. In Fig. 2, 2b indicates a small hole near the center of the lamp wick of the perforated plate, and 2c indicates a small hole near both ends of the lamp wick of the perforated plate. A feature of the present invention is that it is large.

In the above configuration, when the tip of the lamp wick 1 is lit, the flame propagates along the lamp wick in the longitudinal direction, and the fuel contained in the lamp wick 1 is vaporized by the heat, and combustion continues. The amount of vaporized fuel gas gradually increases, and the lower part of the perforated plate is heated, and a flame is formed in the small holes of the perforated plate (flame holding), which becomes a heat source for vaporizing the fuel in the wick.

In this process, in a straight combustor, the flame is concentrated in the center because the flow path resistance is lowest in the center, and the temperature rises faster than at both ends, so the draft force generated by the combustion heat is As the size increases, the flame tends to become more concentrated in the center.

As a result, the flame was cooled in the upper part of the combustion tube, which had not been sufficiently preheated, and incomplete combustion due to partial lack of air caused odor and CO emissions. Furthermore, due to the concentration of the flame, the temperature rise at both ends was delayed, and it took a long time for uniform combustion to occur over the entire body.

According to the structure of the present invention, the diameter of the small holes at both ends is larger than the diameter of the small holes at the center, so the flame holding ability of the small holes at both ends is stronger than that of the small holes at the center. Since the pores are stable and the pore diameter is large, the flame holding has a large amount of heat, and the temperature of the wick in the vicinity of the wick increases quickly, shortening the rise time of the amount of vaporization. In other words, when the diameter of the small hole is large, the size of the flame holding generated in the small hole is large and the amount of heat is large, so the temperature near the flame holding increases and the combustion rate becomes faster, and the heat is supplied from the small hole. Since the contact area (reaction area) between the air and the vaporized gas in the combustion chamber is increased, stable flame holding can be achieved.

By strengthening and stabilizing the flame holding at both ends and increasing the amount of heat, the rate of vaporization rise at both ends becomes faster than that at the center, and the rate of increase in the draft force generated by combustion at the ends becomes faster at the center. This makes it possible to prevent flame concentration.

Experiments have shown that if the small pore diameters at both ends are too large, the flame may rise first at both ends and slightly later at the center, but compared to when the flame is concentrated at the center, less odor and CO are generated. Further, although the effect is greater when the small holes 2c at both ends are provided in both the front perforated plate 2 and the rear perforated plate 3, the effect can be obtained even if provided in either one.

Also, during steady combustion, heat dissipates from the side walls at both ends of the combustion chamber, and the amount of vaporized gas generated from the wick tends to decrease compared to the center, but according to the configuration of the present invention, the amount of heat at both ends increases. This has the effect of supplementing the amount of heat dissipated, making it possible to obtain a uniform amount of vaporization.

Effects of the Invention As explained above, according to the combustor of the present invention,
The diameter of the small holes provided near both ends of the wick of the perforated plate is
By making the holes larger than other parts of the same height, the flame holding ability of the small holes near both ends of the wick will be stronger than that of the small holes near the center of the wick. This increases the flame holding that occurs at the time of ignition, suppressing the concentration of flame in the center at the time of ignition, promoting the temperature rise at both ends of the wick, and increasing the rate of vaporization. Therefore, the following effects can be obtained.

(1) Less odor and less toxic CO when ignited.

(2) The rise time from ignition to stable combustion is short.

In addition, since the flame stability at both ends of the lamp wick is large, the amount of heat at both ends can be increased during steady combustion, and the amount of heat released from the ends is replenished, making it possible to obtain a sufficient amount of vaporization. Therefore, the following effects can be obtained.

(3) Uniform combustion can be obtained from the entire length of the wick by making full use of both ends of the wick.

(4) Sufficient air can be supplied to both ends of the wick without providing extra space on the outside of both ends of the wick, resulting in a compact combustor.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional perspective view of a combustor showing one embodiment of the present invention, and FIG. 2 is a small hole layout diagram of the combustor. 1...Lamp wick, 2...Front perforated plate, 3...Rear perforated plate, 2b...Central small hole, 2c...Both end small holes.

Claims (1)

[Claims] 1. It is composed of a linear lamp wick and a perforated plate with a large number of small holes, and has a combustion chamber formed by providing a pair of perforated plates in front and behind the lamp wick, facing the lamp wick in the longitudinal direction. A small hole is provided in the vicinity of both ends of the lamp wick of one or both of the pair of perforated plates, the hole diameter of which is larger than that of the small holes in other parts of the same height to enhance flame holding ability. A combustor consisting of