JPH0663617B2 - Vaporizer - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a vaporizer of a vaporization type liquid fuel combustion apparatus.

2. Description of the Related Art A conventional combustion apparatus of this type is constructed as shown in FIG. 3 (for example, Japanese Utility Model Laid-Open No. 54-14933).

In the figure, 1 is a vaporization cylinder in which a heater 2 is embedded, 3 is a mixing plate, 4 is a first flame port formed integrally with the mixing plate 3 and radially arranged, and 5 is a second multi-hole. The burner head with the flame outlet 6 opened, and the blower outlet 7 around the tip of the burner head 8
Is a secondary air supply pipe that is radially opened, 9 is a secondary air chamber that is provided at the upper opening edge of the vaporization cylinder 1 and has a large number of inward air ports 10, 11 is a fuel nozzle 12 in the center It is the arranged primary air nozzle. The secondary air supply pipes 7 and 2
The secondary air chamber 9 and the primary air nozzle 11 are each connected to a blower fan (not shown), and the fuel nozzle 12
Is connected to an oil supply device (not shown).

In the above configuration, when the vaporization cylinder 1 is heated by the heater 2 and primary air and liquid fuel are supplied into the vaporization cylinder 1 from the primary air nozzle 11 and the fuel nozzle 12, the fuel is heated to the inner wall of the vaporization cylinder 1. Is vaporized and mixed with primary air,
It becomes a mixture and is jetted from the first flame port 4 and the second flame port 6 and burned. At this time, 2 is directed outward from the outlet 8 of the secondary air supply pipe 7 and 2 inward from the air port 10 of the secondary air chamber 9.
Secondary air is supplied and complete combustion is performed.

When combustion is started, the vaporizing cylinder 1 is heated by the outward flame formed in the first flame port 4, and heat is recovered in the vaporizing cylinder 1.

Problems to be Solved by the Invention However, in the above-mentioned conventional example, the flame opening area (particularly the second flame opening 6) is insufficient due to the downsizing of the combustion part accompanying the downsizing of the equipment or the increase in the combustion amount, and the premixed gas There was a drawback that the flow velocity was too high, causing blowout. In addition, since the flame spreads outward due to the outward combustion by the first flame port 4, and the outer diameter of the flame becomes large, it is difficult to downsize the device.

In addition, when inward combustion is performed to reduce the diameter of the flame, it is difficult to recover heat to the vaporization cylinder 1.

The present invention solves the above-mentioned problems of the conventional example, and makes it possible to sufficiently recover heat while making the vaporizer compact.

Means for Solving the Problems With respect to the above problems, the present invention relates to a cylindrical burner head for inward combustion, an upper end connected to the central lower part of the burner head, and an integral structure from the bottom part of the vaporization cylinder. An upright middle cylinder is provided, and a center air nozzle for ejecting center secondary air in the axial direction of the middle cylinder and the burner head is provided at the center of the lower portion of the middle cylinder.

Action With the above-described configuration, the present invention can reduce the outer diameter of the flame because the combustion is performed by the inward flame, and the length of the flame can be shortened by the action of the center secondary air, so that the device can be downsized. it can. Further, since the high temperature exhaust gas is guided to the lower part of the middle cylinder by the attracting action of the center secondary air, the inner surface of the middle cylinder is heated and heat can be recovered to the vaporization cylinder.

Embodiment Next, one embodiment of the vaporizer of the present invention will be described with reference to FIGS. 1 and 2. In the figure, 13 is a heater, 14 is a vaporization cylinder in which the heater 13 is embedded, 15 is a middle cylinder integrally projected from the central bottom of the vaporization cylinder 14, 16 is a center air nozzle, 17 is a diffusion plate, 18 is a mixing plate, Reference numeral 19 is an air-fuel mixture guide, 20 is a burner head, 21 is a small hole provided in the burner head 20, 22 is a first air supply port provided in the vaporization cylinder 14, and 23 is a second air supply port. 24 is a fuel nozzle, 25 is a fuel pump, 26 is a fuel tank, 27 is a blower fan, 28 is a control valve, 29 is an outer cylinder, and 30 is an outer peripheral air port.

In the above configuration, when the heater 13 is energized to heat the vaporization cylinder 14 to a predetermined temperature, the fuel pump 25 and the blower fan
27 is operated, liquid fuel is supplied from the fuel tank 26 through the fuel nozzle 24 into the vaporization cylinder 14, and a part of the combustion air is used as primary air for the first air supply port 22 and the second air supply. mouth
Enter the vaporization cylinder 14 from 23. At this time, most of the primary air enters the vaporization tube 14 from the first air supply port 22 in the swirling direction, and a small amount of the remaining air cools the fuel nozzle 24 from the second air supply port 23 while fuel is supplied. Along with entering the vaporization cylinder 14. The fuel that has entered the vaporization cylinder 14 collides with the outer wall surface of the heated middle cylinder 15 and splits into small droplets that are scattered in the vaporization cylinder 14 and swirl air from the first air supply port 22. While being swirled in the vaporization cylinder 14 by the flow, it is mainly vaporized on the inner peripheral surface of the side wall of the vaporization cylinder.
At this time, the amount of air that collides with the middle cylinder together with the fuel is small, so local cooling of the collision surface in the middle cylinder 15 is prevented, and fuel splitting is promoted and tar generation is prevented. Further, since the split fuel vaporizes while swirling in the vaporization cylinder 14, the vaporization area is widened, the generation of tar can be suppressed, and the mixture of vaporized gas of fuel and primary air is promoted.

Thus, the fuel vaporized and mixed in the vaporization cylinder 14 to become the air-fuel mixture is guided by the air-fuel mixture guide 19 while being evenly mixed by the mixing plate 18, and the small holes of the cylindrical burner head 20. Ejects inward from 21. Here, it is ignited by an igniter (not shown), and combustion is performed while forming an inward flame. On the other hand, a part of the combustion air supplied from the blower fan 27 is branched by the control valve 28, and a part of it is a middle cylinder.
A center air nozzle 16 arranged at the lower part of 15 blows out in the axial direction of the middle cylinder 15 and the burner head 20 as center secondary air, and the remaining air is guided into the outer cylinder 29 and the outer 2
The next air is ejected inward from the outer peripheral air port 30. The center secondary air from the center air nozzle 16 becomes outward secondary air by the diffusion plate 17, and the flame at the burner head 20 is wrapped with the outer secondary air ejected inward from the outer peripheral air port 30. Therefore, the supply of air to the flame is promoted, and the flame can be shortened. At this time, the burner head 20 is blown by the center secondary air ejected from the center air port 16 at high speed.
The high-temperature exhaust gas due to the combustion at 1 is attracted into the middle cylinder 15, and the inner surface of the middle cylinder 15 is heated to recover heat to the vaporization cylinder 14.
Due to the heat recovery in the vaporization cylinder 14 by the heat reception in the middle cylinder 15, the temperature of each part in the vaporization cylinder gradually decreases from the middle cylinder to the bottom and then to the side wall. It is possible to simultaneously obtain an advantageous high-temperature collision surface on the middle cylinder 15 and a relatively low-temperature vaporization surface on the side wall of the vaporization cylinder, which is advantageous for rapid vaporization of fuel particles after splitting.

EFFECTS OF THE INVENTION As is clear from the above description, according to the vaporization device of the present invention, the middle cylinder integrally erected from the bottom of the vaporization cylinder and the burner head connected to the upper end of the middle cylinder to generate an inward flame, With the center air nozzle arranged in the lower part of the middle cylinder,
The flame is shortened and the device can be made compact, and heat can be recovered to the vaporization cylinder through the middle cylinder by the high-temperature exhaust gas attracted into the middle cylinder. Further, due to the temperature distribution of each part generated by heat recovery, fuel collision and splitting in the high temperature middle cylinder and rapid vaporization in the relatively low temperature vaporization cylinder side wall are performed, and the effect of dispersion of fuel particles by swirling air is included. By increasing the vaporization area and preventing local cooling, tar can be suppressed.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a liquid fuel combustion apparatus adopting an embodiment of the vaporizer of the present invention, FIG. 2 is a horizontal sectional view taken along the line AA in FIG. 1, and FIG. 3 is a conventional combustion apparatus. FIG. 14 …… vaporization cylinder, 15 …… middle cylinder, 16 …… center air nozzle,
20 …… Burner head, 13 …… Heater.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshifumi Moriya 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) Reference JP-A-63-251709 (JP, A) JP-A-63-238316 (JP, A) JP-A-63-238317 (JP, A) Actually developed Shou 55-95016 (JP, U)

Claims (1)

[Claims] 1. A vase-shaped vaporization cylinder in which a heater is embedded, a middle cylinder standing upright with the vaporization cylinder from the bottom in the vaporization cylinder, and a flame disposed inside and inside the middle cylinder. A vaporizer comprising: a burner head to be formed; and a center air nozzle which is arranged in the lower part of the middle cylinder at a substantially concentric center of the middle cylinder and ejects secondary air in the middle cylinder axial direction.