JPS63238314A - Liquid fuel burner - Google Patents

Abstract

PURPOSE:To speed up the vaporization start-up of the liquid fuel, to make uniform vaporization and mixing to carry out a complete combustion and to realize thinning and miniaturization of the burner by annularly forming a vaporizing chamber, a mixing chamber and a combustion chamber, concentrically and annularly in sequence around the outer circumference of a heating element used as an axial core with which a fuel nozzle and a primary air port are faced. CONSTITUTION:A vaporizing chamber 12, a mixing chamber 13 and a combustion chamber 16 are constituted substantially concentrically around the outer circumference of a heating element 6 as an axial core. A liquid fuel injected through a fuel nozzle 9 to a vaporizing plate 8 is guided by primary air and vaporized by receiving a high-temperature heat of a vaporizing plate 8 through a fuel nozzle 9 and is filled within the vaporizing chamber 12. Then, the liquid fuel is injected into the mixing chamber 13, and converted to a dense mixed gas by receiving primary air from a mixed air hole 14. Further, the liquid fuel is uniformly distributed over the entire circumference of the mixing chamber 13 by a smoothing plate 15, and is supplied into the combustion chamber 16 via the smoothing plate 15. Then, the liquid fuel is ignited by an igniter 13 and secondary air is supplied in a concentrated manner in a large amount through numberless secondary air holes formed in the right and left walls, and forms a combustion flame 20 in a short, annular blue flame state, thus performing complete combustion.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to improving the characteristics of a combustor and making it thinner and smaller by burning liquid fuel.

Conventional f! ,η.

Conventionally, this type of combustion device has either a Bunsen type in which the vaporizing section is separate and particularly linear, or a cylindrical all-primary type combustor 1, as shown in Fig. 2, which has been made thinner or smaller in diameter. Alternatively, as shown in Figure 3, the diameter of the round, outward-flame Bunsen type or full-order combustor 2 can be made smaller to increase the combustion load and improve the flame-holding effect and supply of secondary air. He was ingenious. Note that this was a liquid fuel combustion device in which heat exchangers 3 and 4 were arranged on the upper half portions of the combustors 1 and 2. 5 and 6 are combustion flames.

Problems to be Solved by the Invention However, in the above configuration, in the conventional example shown in FIG. Due to this relationship, there is a limit to overall thinness and miniaturization, and the rise of vaporization and the turbulence of flames at both ends of the length, which is a linear flame form, cause odor, C.
The generation of O was not completely eliminated, and there were many problems in terms of combustion characteristics.

On the other hand, in the case of a combustor 2 similar to that shown in FIG. 3, the outward flame type combustor 2 has much more problems in terms of size reduction than the one shown in FIG. still,
If the one in Figure 3 is simply turned 90 degrees and placed sideways, the configuration will be in the -plane thinner direction, but a draft effect will occur up and down on the combustion surface, making it impossible to ensure sufficient flame holding and the flame will move left and right. This was problematic, resulting in odor, CO production, and extreme non-distribution of flame length.

Means for Solving the Problems In order to solve the above-mentioned problems, the liquid fuel combustion device of the present invention has the heating body facing the fuel nozzle and the primary air port as the axis, and the outer periphery of the heating body. Sequentially, vaporization chamber, mixing chamber,
The combustion chamber is configured in a concentric ring shape.

Effect The present invention has the above-described configuration, in which there is a vaporization chamber surrounding the heating body in the center of the combustion chamber, and the vaporization chamber, the mixing chamber,
Because the combustion chamber is annular in shape, the liquid fuel vaporizes rapidly, and vaporization and mixing are performed effectively and uniformly.Furthermore, the combustion flames are formed in an unbroken annular shape facing each other. It is possible to construct a thin and compact combustion device that achieves complete combustion without producing odors, odors, or cobalt.

EXAMPLE Hereinafter, an example of the present invention will be described based on the accompanying drawings. In Fig. 1, reference numeral 6 denotes a heating body made of a ceramic material or the like by molding or baking a hollow cylindrical heating wire 7, and a vaporizer made of a porous member of a heat-resistant material or a wick, etc. The plate 8 also has a fuel nozzle 9 for liquid fuel and a primary air port 10 facing the negative side. On the other hand, the other end surrounds the entire heating body 6 and communicates with a vaporizing chamber 12 having a vaporized gas ejection hole 11 at the center of the outer periphery.

Reference numeral 13 denotes a mixing chamber disposed around the outer periphery of the vaporization chamber 12, which has a plurality of mixing air holes 14 on one or both walls, and whose upper outer part is narrowed from the left and right side walls, and a heat-resistant material is provided at the smallest diameter part. A rectifier plate 15 made of a wire mesh, a punched plate, or the like is attached. 16 is a plurality of secondary air holes 1 on the left and right side walls.
7 is a substantially V-shaped combustion chamber with a secondary air hole 1 formed therein.
Basically, it is desirable that the electrodes 7 face each other, but various forms of facing may be considered depending on the characteristics of combustibility and combustion noise. 18 is a pressure equalizing and flame stabilizing plate provided at the top end of the combustion chamber 16;
19 is an igniter, and 20 is a blue flame-shaped combustion flame formed above the secondary air hole 17. 21 is a heat exchanger having an exhaust port 22 on one outer peripheral side, and air supply ports 2 on the left and right side walls in the center.
3, communicates with the air supply port 23, and surrounds the vaporization chamber 12, the mixing chamber 13, and the combustion chamber 16.
4. Note that the air supply port 23 may be provided only on either the right side or the left side in the figure. However, this can be achieved by providing one or more air communication pipes 25 on a portion of the left and right side walls of the mixing chamber 13. It goes without saying that the heating element 6 may be a hollow cylindrical cartridge type sheathed heater instead of a ceramic type heater, but in the case of the ceramic type heaters, at least the inner periphery It is preferable to provide a cylindrical metal cover on the surface to prevent the heater from being damaged by direct contact with liquid fuel particles.

Particularly, the aim of the present invention is to form a vaporizing chamber 12, a mixing chamber 13, a combustion chamber 16 approximately concentrically around the heating body 6 as an axis.
The reason lies in the fact that it has been constructed.

In the above configuration, first, the heating element is energized, and on the other hand, a fuel pump (not shown) supplies an appropriate amount of liquid fuel to the fuel nozzle 9.
from the already heated vaporization plate 8, and the combustion air is supplied by a blower (not shown) from the air supply ports 10, one as primary air to the primary air port 10 and the mixing air hole 14, and the other as primary air to the mixing air hole 14. The secondary air is divided and supplied to the plurality of secondary air holes 17 as secondary air. Next, the liquid fuel that was first injected from the fuel nozzle 9 to the vaporization plate 8 is guided by a small amount of primary air to the vaporization plate 8.
It is heated to a high temperature and vaporized, filling the vaporization chamber 12, injected into the mixing chamber 12 from the vaporized gas injection hole 11, and receiving primary air from the mixing air hole 14 to become a rich mixed gas. 15, the mixture is uniformly distributed over the entire circumference of the mixing chamber 13, passes through the baffle plate 15, and is supplied into the combustion chamber 16. At that point, when a spark or the like is generated by the igniter 19, the rich mixed gas is ignited, and secondary air is directed toward the rich mixed gas from the countless secondary air holes drilled in the left and right walls, and is directed toward the rich mixed gas. Since a large amount of finely divided air is supplied intensively, a short annular gastritis-like combustion flame 2o is formed without soot, odor, CO, etc., and complete combustion is achieved. Moreover, even when the combustion amount is varied, the combustion flames 20 in several stages become annular combustion flames facing each other, so the flame holding power is strong, and breaks in the combustion flame 2o are less likely to occur, so that extremely local lift can be achieved. The phenomenon is unlikely to occur. As a result, soot, odor, co
It is a clean and complete combustion method for short gastritis with extremely low occurrence of gastritis. Further, a wide combustion variable range (ie, T, D, R) can be obtained. Furthermore, as described above, even with the draft action occurring above and below the combustion flame 20, the combustion flame 20 burns without being divided vertically or horizontally, so that stable combustion can be obtained against disturbance effects.

On the other hand, when extinguishing a fire, the fire is instantly extinguished by cutting off the power to the fuel pump.

Effects of the Invention As described above, according to the liquid fuel combustion apparatus of the present invention, the following effects can be obtained.

(1) By configuring the combustion section in a concentric ring shape with the heating body as the axis and the vaporization chamber, mixing chamber, and combustion chamber, the heating and vaporization of the liquid fuel at the initial stage of combustion is effective, so that Start-up time is fast.

(2) Since the structure expands from the vaporization chamber to the combustion chamber, vaporization and mixing can be carried out smoothly.Also, the secondary air holes are arranged in an annular shape facing each other. The combustion flame is uniform all around and has a strong flame-holding ability, so there is no soot.
Complete combustion with a short blue flame was achieved in a clean manner with no odor or CO generation. In addition, by strengthening the above-mentioned flame holding power, the combustion flame is less likely to be divided vertically or horizontally against tract action or disturbance caused by the combustion flame itself, so the combustion variable width (i.e. T, D, R) is reduced. Can be widely secured.

(3) Since the number of combustion members is small and most of the parts other than the heating element can be made of pressed sheet metal parts, light weight and low cost can be expected.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a combustion device showing an embodiment of the present invention, and FIGS. 2 and 3 are vertical cross-sectional views showing conventional combustion devices. 7... Heating body, 8... Vaporizing plate, 9... Fuel nozzle, 10...-Next air port, 11...
・Vaporization gas outlet, 12... Vaporization chamber, 13...
・Mixing chamber, 14... Mixing air hole, 15... Rectifying plate, 16... Combustion chamber, 17... Secondary air hole,
24...Air chamber. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 7--Heating 1-3--1 Higi at once (

Claims (1)

[Claims] A hollow cylindrical heating body with a fuel nozzle and a primary air port facing on one side; a vaporization chamber having a vaporized gas ejection hole around the heating body; and a plurality of mixing air holes on at least one side wall. a mixing chamber having a mixing chamber; a rectifying plate provided outside the mixing chamber; a combustion chamber having a plurality of secondary air holes formed in opposite sides above and on both side walls of the rectifying plate; A liquid fuel combustion device in which surrounding air chambers are arranged in substantially concentric circles.