JPS60200011A - Liquid fuel burner - Google Patents

Abstract

PURPOSE:To control accumulation of tar on an evaporation surface, by a method wherein fuel is evaporated under being swirled, while a projected part is provided on a part of the evaporation surface and the fuel is made to collide directly against the evaporation surface in a swirling direction side from the projected part. CONSTITUTION:Fuel is injected into a vaporization chamber 1 from a fuel nozzle 6 under being turned. The fuel is turned into evaporation gas through influence of the temperature of an evaporation surface 7 and flows out into a burner part 8 by passing through a narrowed part of a mixing plate provided on the upper part. In this instance, the evaporation fuel gas is mixed with combustion gas, and a combustion flame is formed in a combustion part 8 as an air-fuel premixture. In this instance, although the evaporation is performed on the evaporation surface 7, the whole fuel swirling direction through the combustion air and a swirling flow as there is a projected part 9 on the evaporation surface 7, an evaporation state of the fuel is stabilized and a variation in evaporation is eliminated. With this construction, accumulation of tar on the evaporation surface can be controlled.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a combustion device for vaporization premix combustion using petroleum as fuel, which is applied to household heaters and the like.

Conventional Structure and its Problems A conventional liquid fuel combustion apparatus of this type is constructed as shown in FIG. That is, a heater 2 is installed in the circumferential direction of the bottom of a cylindrical bottomed vaporizing chamber 1, and a mixing plate 3 having a constricted shape is installed on the open surface. Further, a blower pipe 4 is connected to a part of the vaporizing chamber 1, and combustion air is sent into the vaporizing chamber 1 from the blower fan 5, and a fuel nozzle 6 is passed through the blower tube 4 and directed into the vaporizing chamber 1. ing. The fuel is vaporized together with combustion air on the vaporization surface 7 provided on the inner wall of the vaporization chamber 1, and is supplied to the upper combustion section 8 while being mixed, where it is combusted.

In this configuration, during steady combustion, the temperature of the vaporization surface 7 is high due to the influence of heat conduction from the heater 2 and the combustion section 8 which is at a high temperature due to the combustion flame. In this vaporized m17, fuel and combustion air are heated to the inner periphery of the vaporizing chamber and ejected, and are vaporized while swirling. However, the vicinity of the vaporization surface 1 where the fuel ejected into the vaporization chamber 1 directly collides, that is, the collision surface 7a, is likely to lose heat due to the direct collision of the ejected fuel and combustion air, and is in this low temperature range. In the vicinity of the collision UIJi7a, the fuel turned into tar due to the influence of air, and the accumulation of tar caused the generation of toxic oxides. Furthermore, after colliding with the collision surface 7a, most of the fuel and combustion air scatter in the direction of the swirling flow;
Since the fuel and combustion air are scattered in other directions, there are many problems such as dispersion of the fuel, disturbance of vaporization, pulsation of the combustion flame, and the risk of generation of carbon oxide.

OBJECTS OF THE INVENTION The present invention solves these conventional problems, and aims to provide high-quality combustion by suppressing tar accumulation on the vaporizing surface.

Structure of the Invention In order to achieve this object, the present invention makes the fuel and combustion air in the vaporization chamber live on the inner circumferential vaporization surface of the vaporization chamber, and vaporizes them while swirling. A portion is provided, and the fuel is made to directly impinge on the vaporization surface on the side of the turning direction from this convex portion.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.

Reference numeral 1 denotes a cylindrical vaporization chamber with a bottom. A heater 2 is installed in the inner peripheral direction of the bottom surface, and a mixing plate 3 having a diaphragm shape is installed in the open surface. Further, a blower pipe 4 is connected to a part of the vaporizing chamber 1, and combustion air is sent into the vaporizing chamber 1 from the blower fan 5, and a fuel nozzle 6 is passed through the blower tube 4 and directed into the vaporizing chamber 1. ing. The fuel, together with the combustion air,
It is jetted cleanly from the blast pipe 4 to the inner periphery of the vaporization chamber 1, vaporized while swirling on the vaporization surface 7 provided on the inner wall of the vaporization chamber 1, and supplied to the upper combustion section 8 while being mixed, where it is combusted. . At this time, a convex portion 9 is provided in a part of the vaporizer m17, and a collision surface 7a with which fuel directly collides with the vaporizer surface 7 on the side of the turning direction from the convex portion 9 is provided.

With this configuration, the vaporization chamber 1 is heated by supplying electricity to the heater 2 in the vaporization chamber 1. Thereafter, combustion air is introduced into the vaporization chamber 1 by driving a blower fan 5 provided through the blower pipe 4 . Next, fuel nozzle 6
As a result, the fuel is injected into the vaporization chamber 1 while swirling. The fuel becomes a vaporized gas due to the influence of temperature on the vaporizing surface 7,
” It passes through the constriction part of the mixing plate 3 arranged in the second part and flows out to the combustion part 8. At this time, the fuel vaporized gas is mixed with combustion air to form a combustion flame in the combustion section 8 as a premixture.

At this time, the fuel is vaporized at the vaporization surface 7, but the fuel ejected to the collision surface 7a is caused by the swirling flow caused by the combustion air.
Because of the convex portions 9, everything dispersed in the direction of rotation, and the vaporization form of fuel 1 became stable, eliminating fluctuations in vaporization.

Here, the flow of fuel and combustion air will be explained in detail in comparison with the conventional example. In the conventional example, as shown in FIG. 3, after the fuel and combustion air ejected into the vaporization chamber 1 collide with the collision surface 7a,
Most of the fuel and combustion air are scattered in the direction of the swirling flow, but fuel and combustion air are also scattered in other directions, so a flow opposite to the swirling flow is generated on the opposite side of the swirling direction, and in this counter-swirling flow. The scattered fuel reconcentrates without being sufficiently dispersed and becomes large particles that accumulate on the vaporization surface 7'', causing disturbances in vaporization and creating a great danger of generating carbon oxides and the like. However, as shown in FIG. 4, according to this embodiment, the fuel ejected into the vaporization chamber 1 does not collide with the collision surface 7a, but is all dispersed in the swirling direction by the convex portions 9, and flows into a counter-swirling flow. Since the fuel vaporizes without scattering, the vaporization form of the fuel becomes stable and fluctuations in vaporization are eliminated. Since the fuel does not scatter in the anti-swirling flow and re-aggregate into large particles, tar formation and accumulation occurs due to local cooling phenomenon caused by the heat of vaporization that is instantly taken away when large particles of fuel vaporize. Not only is it not easy to move by 1 degree, the existence of the convex portion 9 creates a slight gap in the flow of combustion air, which reduces the cooling of the collision surface 7a by the combustion air, and prevents tar 41 mm from colliding with the collision surface 7a. Furthermore, by directing the jetting direction of the combustion air downwards rather than the jetting direction of the fuel, the vaporization of the fuel at the bottom of the vaporizing chamber 1 can be promoted, resulting in more stable vaporization. I can do it.

Effects of the Invention According to the liquid fuel combustion device of the present invention, fuel and combustion air are jetted out along the inner circumferential vaporization surface of the vaporization chamber, vaporized while swirling, and a convex portion is provided on a part of the vaporization surface. By causing the fuel to directly impinge on the vaporization surface on the side of the turning direction from this convex portion, the following effects can be obtained.

(1) By making the scattering direction of the fuel constant, the fuel will no longer aggregate into large particles and remain on the vaporization surface, so the vaporization form of the fuel will be stable and fluctuations in vaporization will be eliminated. The generation of carbon monoxide due to combustion flame pulsations and air-fuel ratio disturbances can be prevented, and combustion characteristics can be improved.

(2) The local cooling phenomenon of the vaporization surface caused by large fuel particles and combustion air is alleviated, and the entire vaporization surface becomes effective in vaporizing the fuel without being affected by air and turning into tar in a low fuel temperature range. By this action, tar formation and accumulation on the vaporizing surface are almost eliminated, and ignition, extinguishing, and combustion odor and generation of toxic substances such as carbon oxide are significantly reduced.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a conventional liquid fuel combustion device, FIG. 2 is a sectional view showing a liquid fuel combustion device according to an embodiment of the present invention,
FIG. 3 is a sectional view of the vaporization chamber of a conventional liquid fuel combustion device, FIG. 4 is a sectional view of the vaporization chamber of this embodiment, and FIG. 5 is a sectional view of the vaporization chamber of another embodiment of the present invention. . 1... Vaporization chamber, 4... Air pipe, 6...
... Fuel nozzle, 7... Evaporation surface, 7a...
...Collision surface, 9. Old... Convex part. Name of agent: Patent attorney Toshio Nakao (1st person)
Figure 2

Claims (2)

[Claims] (1) Fuel and combustion air are injected into a cylindrical bottomed vaporization chamber equipped with a heating means along the inner circumferential vaporization surface of the vaporization chamber, vaporized while swirling, and have a convex part on the vaporization surface. A liquid fuel combustion device in which fuel is directly impinged on the vaporization surface on the side of the swirling direction from the convex part. (2) The liquid fuel combustion device according to claim 1, wherein the direction in which the combustion air is ejected is directed downward than the direction in which the fuel is ejected.