JP2512126B2 - Liquid fuel combustion device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a liquid fuel combustion apparatus such as an oil fan heater.

2. Description of the Related Art Generally, a liquid fuel combustion apparatus in an indoor combustion device such as an oil fan heater is configured as shown in FIG. That is, in FIG. 4, 13 is a bottomed cylindrical vaporization cylinder for vaporizing the liquid fuel, in which the sheath heater 14 is embedded. Reference numeral 15 is a burner head in the shape of a heavenly cylinder which is attached to the upper opening of the vaporization cylinder 13, has a flame hole 16 all around, and is fixed by a screw to a column 17 protruding on the inner surface of the vaporization cylinder 13. . 18 is a flame hole 16
An ignition electrode 19 for igniting the fuel gas ejected from the fuel cell is a flame. 20 is a blower tube for sending combustion air into the vaporization cylinder 13,
The air port 21 at the tip is fixed to the wall surface of the vaporization cylinder 13. twenty two
Is a fuel supply nozzle arranged through the inside of the blower pipe 22,
It faces the inside of the vaporization cylinder 13. The nozzle 22 communicates with an oil supply pipe 24 from a fuel pump 23, and the blower pipe 20 communicates with a blower 25.

Regarding the liquid fuel combustion device configured as described above,
The operation will be described below.

First, when the vaporization cylinder 13 is heated to a predetermined temperature by the sheath heater 14, the combustion air sent by the blower 25 is sent from the air port 21 into the inside of the vaporization cylinder 13, and the fuel is supplied to the nozzle 22 by the fuel pump 23. Is ejected from inside the vaporization cylinder 13. The liquid fuel ejected inside the vaporization cylinder 13 is vaporized on the wall surface of the heated vaporization cylinder 13, mixed with combustion air, then introduced into the burner head 15, and ignited by spark discharge from the ignition electrode 18, A flame 19 is formed in the flame hole 16.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the above-described conventional configuration, when the fuel ejected from the nozzle 22 collides with the side surface inside the vaporization cylinder 13 and then jets along the inner peripheral surface of the vaporization cylinder, most of it is here. Although vaporized, when jetting along the inner peripheral surface of the vaporizing cylinder, the column 17 for mounting the burner head 15 protruding from the inner peripheral surface of the vaporizing cylinder 13 disturbs the flow of combustion air or ejects from the nozzle 22. There was a case where the liquid fuel collided with the pillar 17 due to the dispersion of the jetting and the normal vaporization was not performed. Therefore, the flame changes greatly from the lift state to the yellow fire generation state due to lack of air, and the flame formed around the entire circumference of the burner head 15 also has a bias of the flame in which the yellow fire state exists from the lift state, causing odor, There was a problem that soot and CO were generated.

The present invention solves such a conventional problem, and realizes a stable mixed gas concentration in a wide range of combustion states from a large flow rate to a small flow rate, and periodically generates incomplete combustion and uneven bias of the flame. The purpose is to prevent yellow fire, soot, odor, CO, etc. from occurring.

Means for Solving the Problems In order to solve the above problems, the present invention provides a bottomed tubular vaporization tube having a built-in heater, a burner head attached to an opening of the vaporization tube, and a side surface of the vaporization tube. It is equipped with a nozzle for ejecting fuel and a blower pipe for supplying combustion air arranged concentrically with the nozzle, and the vaporization cylinder is provided with an annular step portion on its inner peripheral surface so that the inner diameter of the upper portion becomes sharper than the inner diameter of the lower portion. Make it bigger,
In addition, the inner peripheral surface of the mixing section at the bottom of the vaporizing cylinder is an inner peripheral surface without a burner head mounting column, and the nozzle and the blower pipe for supplying combustion air are mounted in a slanting upward direction, where fuel jetted from the nozzle collides. Only the stepped portion of the above is configured to be tapered upward.

Effect According to the present invention, due to the above configuration, the fuel ejected from the nozzle reaches the high temperature portion of the inner peripheral wall of the vaporization cylinder together with the combustion air sent from the air port, and the strong swirling flow causes a long residence time on the inner peripheral wall and vaporization is instantaneous. To be done. Further, since the volume of the upper part of the vaporization cylinder is made suddenly larger than that of the lower part, the vaporized fuel and the combustion air are mixed better by the chamber effect in the upper part and the diffusion effect by the rapid volume expansion, The periodic pulsating combustion and flame bias as shown in the conventional example are eliminated. Therefore, the time delay of vaporization and insufficient mixing as described above are eliminated, and yellow fire, soot, odor, CO, etc. do not occur.

Embodiment A liquid fuel combustion apparatus according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a liquid fuel combustion apparatus according to a first embodiment of the present invention. In FIG. 1, reference numeral 1 is a vaporization cylinder for vaporizing liquid fuel, in which a sheathed heater 2 is embedded, and the diameter of the upper portion 1B where the mixing is promoted is larger than the diameter of the lower portion 1A where vaporization is performed. Has become. Reference numeral 3 is a burner head for burning a mixed gas of vaporized fuel and combustion air, and a large number of flame holes 4 are provided substantially evenly on the peripheral wall thereof. Reference numeral 5 is an ignition electrode for igniting the mixed gas ejected from the flame hole 4, and 6 is a flame. Reference numeral 7 is a blower pipe for sending combustion air into the vaporization cylinder 1, and the air port 8 at the tip is the vaporization cylinder 1
Is fixed to the wall surface of the fan, and the other end communicates with the blower 9. Reference numeral 10 denotes a nozzle communicating with an oil supply pipe 12 from a fuel pump 11, which is exposed to the inside of the vaporization cylinder 1 through the inside of the air blow pipe 7. Reference numeral 1'denotes a column for mounting the burner head mounted on the inner peripheral surface of the vaporization cylinder upper portion 1A.

In the above structure, when the sheath heater 2 is energized and the vaporization cylinder 1 is heated to a predetermined temperature, the blower 9 is started and combustion air is blown through the blower pipe 7 into the vaporization cylinder 1 through the air port 8. The fuel pump 11 is also started and fuel is sent to the oil pipe.
It is ejected from the nozzle 10 through the nozzle 12 into the vaporization cylinder 1. The liquid fuel ejected inside the vaporization cylinder 1 is heated by the vaporization cylinder 1.
After being vaporized on the side wall surface of and mixed with combustion air, it is sent to the burner head 3 and ejected from the flame holes 4. And this mixed gas is ignited by the spark discharge from the ignition electrode 5,
The flame 6 is formed.

Here, the fuel ejected from the nozzle into the vaporization cylinder 1 is
The vaporized fuel collides with the inner wall surface of the vaporization cylinder 1 and is vaporized, and the strong and smooth swirling of the combustion air in the small diameter portion of the lower portion 1A allows good mixture of the vaporized fuel and air, and When it reaches the part where the diameter of the upper part 1B suddenly increases,
Mixing is promoted by the diffusion effect and chamber effect due to the rapid volume expansion, and the pulsation is absorbed, and a uniform mixed gas is guided to the burner head 3, and a uniform and stable flame is formed on the entire circumference. Therefore, there is no periodical pulsating combustion and non-uniformity of flame, resulting in yellow fire, odor, soot, and CO.
Etc. will disappear.

Next, a second embodiment of the present invention will be described with reference to the drawings.

FIG. 2 is a configuration diagram of a vaporization cylinder and a nozzle portion showing a second embodiment of the present invention. The difference from the first embodiment is that the nozzle 10 and the blower pipe 7 for supplying combustion air are attached in an upwardly inclined shape, and the upper inner surface 1B 'of the vaporization cylinder 1 on which the fuel ejected from the nozzle 10 collides is tapered. That is the point.

The liquid fuel combustion device configured as described above can further obtain the following effects. That is, the fuel ejected from the nozzle 10 and the air flow ejected from the air port 8 together with the air flow ejected from the air port 8 have an upper inner peripheral surface 1B of the uppermost vaporization cylinder 1 near the sheath heater 2.
To reach. Since the collision surface is tapered upward, the ejected fuel spreads on the tapered surface without being scattered and is instantly vaporized. Due to the stronger swirling flow and the chamber effect in the upper part of the vaporizing cylinder 1, a stable mixed gas concentration can be obtained.

As described above, in this embodiment, a stable mixed gas concentration can be obtained in a wide range from a large flow rate to a small flow rate, and the occurrence of yellow fire, odor, soot, CO, etc. due to incomplete combustion can be more reliably prevented. .

EFFECTS OF THE INVENTION As is apparent from the description of the embodiments above, according to the present invention,
The fuel ejected from the nozzle is mixed by the strong and smooth swirling flow of the combustion air sent from the air port,
Moreover, the mixing is promoted by the diffusion effect and the chamber effect due to the volume expansion in the upper part of the vaporizing cylinder which is rapidly increased, and the vortex flow generated at the step portion further stirs the flow to further promote the mixing to obtain a uniform mixed gas. Further, since only the inner peripheral surface of the vaporizing cylinder at the portion where the fuel ejected from the nozzle mounted in the upward inclined shape collides is tapered upward, the effective area for vaporizing the fuel increases, and
It is possible to prevent fuel from scattering and maintain stable vaporization. Then, due to the synergistic effect thereof, pulsation due to vaporization or generation of yellow fire, soot, odor, CO, etc. due to scattering of fuel can be prevented, and complete combustion can be stably maintained.

[Brief description of drawings]

FIG. 1 is a sectional view showing the entire liquid fuel combustion apparatus according to the first embodiment of the present invention, FIG. 2 is an enlarged sectional view of a vaporization cylinder according to the second embodiment, and FIG. 3 is a conventional liquid fuel combustion. Sectional drawing which shows the whole apparatus, FIG. 4 is a perspective view of the conventional vaporization cylinder. 1 ... Vaporization cylinder, 1A ... Lower vaporization cylinder, 1B ... Upper vaporization cylinder,
2 ... Sheath heater, 3 ... Burner head, 7 ... Blower tube, 10 ... Nozzle.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-61-130715 (JP, A) JP-A-59-195332 (JP, A) Actually open 56-80427 (JP, U) Actual-open Sho 61- 53630 (JP, U)

Claims (1)

(57) [Claims] 1. A bottomed cylindrical vaporization cylinder having a built-in heater, a burner head attached to the opening of the vaporization cylinder, a fuel ejection nozzle facing the side surface of the vaporization cylinder, and a concentric outer circumference of the nozzle. And a blower pipe for supplying combustion air,
The vaporization cylinder is provided with an annular step on its inner peripheral surface to make the upper inner diameter sharply larger than the lower inner diameter, and the inner peripheral surface of the mixing portion of the lower part of the vaporization cylinder is an inner peripheral surface without a burner head mounting column, A liquid fuel combustion device in which a nozzle and a blower pipe for supplying combustion air are attached in an upwardly inclined shape, and only a step portion of a portion where fuel ejected from the nozzle collides is upwardly tapered.