JPH029217Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a liquid fuel vaporization type combustion device that vaporizes liquid fuel and burns it.

Conventionally, as shown in FIGS. 1(a) and 1(b), liquid fuel A in an oil storage tank 10 is fed to a vaporizer 11, the liquid fuel A is vaporized in the vaporizer 11, and the vaporized fuel is further vaporized. In a liquid fuel vaporization type combustion device in which liquid fuel is jetted from the tip of a jet nozzle 12 into a mixing pipe 13 and burned by a burner 14, a jet nozzle insertion plate 1 of the jet nozzle 12 is provided at one end of the mixing pipe 13.
5, an air suction port 16a, 16b is provided on the upper and lower sides, and a jet nozzle insertion hole 17 is formed in the center of the insertion plate 15 to have a diameter larger than that of the jet nozzle 12.
A liquid fuel vaporization type combustion device is known.

However, in such a liquid fuel vaporization type combustion device, the nozzle port 12a of the injection nozzle 12 is cooled by the air sucked in from the gap between the injection nozzle 12 and the injection nozzle insertion hole 17, so that when combustion is stopped, the liquid fuel is not vaporized. The liquid fuel A vaporized by preheating the vessel 11 turns into tar at the nozzle port 12a, and even during combustion, although in small amounts, it turns into tar at the jet port 12.
The problem was that 2a was blocked.

In view of the above-mentioned conventional problems, the present invention aims to provide a liquid fuel vaporization type combustion device in which the vaporized fuel does not turn into tar at the nozzle opening of the jet nozzle not only when combustion is stopped but also during combustion. It is. Embodiments of the present invention will be described below with reference to FIGS. 2 to 5.

FIGS. 2 and 3(a) show a first embodiment of the present invention, and the same components as in the conventional example are designated by the same reference numerals. That is, 10 is an oil storage tank storing liquid fuel A, 11 is a vaporizer for vaporizing liquid fuel A,
12 is an ejection nozzle that ejects the vaporized fuel; 12a;
is a nozzle port for vaporized fuel formed at the tip of the jet nozzle 12; 13 is a mixing tube for mixing vaporized fuel and air; it is formed in a ventilate shape; an insertion plate 15, which will be described later, is attached to one end; It is connected to the burner 14. Reference numeral 15 denotes an ejection nozzle insertion plate (hereinafter simply referred to as an insertion plate) into which the nozzle port 12a side of the ejection nozzle 12 is inserted, and is formed so as to cover one end opening of the mixing pipe 13. In addition to providing ports 16a and 16b, a jet nozzle insertion hole (hereinafter referred to as an insertion hole) 17 is provided in the center with a diameter larger than the diameter of the jet nozzle 12 on the nozzle port 12a side. Note that 18 is an electromagnetic pump that supplies liquid fuel A to the vaporizer 11, and 19 is a cleaning needle for the nozzle port 12a.

20 is a sealing member made of polybutene resin;
It is attached via the outer circumferential surface of the jet nozzle 12 near the tip and one side of the insertion plate 15 near the insertion hole 17, and the gap 21 formed between the jet nozzle 12 and the insertion hole 17 is closed. There is.

As described above, in the liquid fuel vaporization type combustion apparatus according to the first embodiment of the present invention, the seal member 20 made of polybutene resin connects the jet nozzle 12 and the insertion hole 17.
Since the gap 21 between the two is closed, air will not be sucked in from the gap 21 to cool the nozzle port 12a side of the jet nozzle 12. Therefore,
As shown in Fig. 4, as in the conventional liquid fuel vaporization type combustion device, the vaporizer 11 heats the fuel to around 280°C.
The temperature of the vaporized liquid fuel A does not drop to around 240°C on the nozzle opening 12a side of the jet nozzle 12 as shown in curve (a), but is maintained at around 260°C as shown in curve (b). Therefore, the adhesion of tar to the nozzle port 12a is reduced.

In addition, as shown in Figure 5, even in acceleration tests (tests in which the nozzle opening of the jet nozzle is forcibly blocked using kerosene with a high tar content), the lifespan has conventionally been approximately 25 hours (a). On the other hand, in the first embodiment, the life time is about 40 hours (b), which means that the life time is longer.

Furthermore, the temperature of the jet nozzle 12 is about 270°C due to the heat from the vaporizer 11, but this heat is blocked from moving to the insertion plate 15 and the mixing tube 13 by the seal member 20. The temperature of the nozzle port 12a does not drop that much.

FIG. 3(b) shows a second embodiment of the present invention, in which a seal member 30 is made of foamed asbestos having heat insulating properties, and is connected to the outer circumferential surface of the nozzle opening 12a of the jet nozzle 12. The injection nozzle 1 is installed through the insertion plate 15 near the insertion hole 17 and the other side surface.
2 and the insertion hole 17 is closed.

As described above, in the liquid fuel vaporization type combustion apparatus according to the second embodiment of the present invention, the gap 31 between the ejection nozzle 12 and the insertion hole 17 is provided by the sealing member 30 made of foamed asbestos having heat insulating properties. Since the nozzle port 12a side of the ejection nozzle 12 is closed, the nozzle port 12a side of the jet nozzle 12 is insulated and kept warm by the foamed asbestos seal member 30, and as shown in FIG. 4, the temperature at the nozzle port 12a side is also as shown by the curve (C). Since the temperature is maintained at about 280° C., the adhesion of tar to the nozzle port 12a is significantly reduced. Furthermore, as shown in FIG. 5, the acceleration test also results in a significantly longer service life of approximately 75 hours (c).

In addition, the foamed asbestos seal member 30 has better heat insulation and heat retention than the seal member 20 of the previous embodiment, so heat transfer to the insertion plate 15 is reliably suppressed, and the temperature drop at the nozzle port 12a is further reduced. .

As explained above, the present invention provides a jet nozzle insertion hole having a diameter larger than the outer diameter of the nozzle mouth side of the jet nozzle in the jet nozzle insertion plate that is attached to one end of the mixing pipe that sucks air and into which the nozzle mouth side of the jet nozzle is inserted. In the liquid fuel vaporization type combustion apparatus, the gap formed between the nozzle mouth side of the jet nozzle and the jet nozzle insertion hole is closed with a heat-insulating sealing member, so that the nozzle of the jet nozzle is closed. Since air is not sucked in from the gap between the mouth side and the jet nozzle insertion hole and the nozzle mouth side of the jet nozzle is not cooled, tar adhesion to the nozzle mouth of the jet nozzle is reduced. This has the advantage of ensuring stable combustion.

In addition, the metal parts of the jet nozzle and nozzle insertion plate are not in direct contact with each other, and the gap is closed with an insulating and heat-retaining sealing member, which prevents the heat from the nozzle opening from escaping to the nozzle insertion plate side. This also prevents a drop in temperature at the nozzle opening.

[Brief explanation of the drawing]

The drawings are for explaining the present invention, and are shown in Figure 1(a).
(b) shows a conventional liquid fuel vaporization type combustion device;
FIG. 1(a) is a partially sectional front view, FIG. 1(b) is a sectional view showing the main parts, and FIGS. 2 to 5 show the liquid fuel vaporization type combustion apparatus according to the present invention. The figure is a partially sectional front view, FIG. 3(a) is a sectional view of the main part showing the first embodiment of the present invention, and FIG. 3(b) is a sectional view of the main part showing the second embodiment of the invention. FIG. 4 is an explanatory diagram showing temperature changes of vaporized fuel between the carburetor and the nozzle port, and FIG. 5 is an explanatory diagram showing an acceleration test. In the figure, 12... Ejection nozzle, 12a... Nozzle opening, 13... Mixing tube, 15... Ejection nozzle insertion plate, 17... Ejection nozzle insertion hole, 20, 30...
Seal member, 21... gap.

Claims (1)

[Scope of utility model registration request] A liquid fuel vaporization type in which a jet nozzle insertion hole having a diameter larger than the outside diameter of the jet nozzle on the nozzle mouth side is provided in a jet nozzle insertion plate that is attached to one end of a mixing pipe that sucks air and into which the nozzle mouth side of the jet nozzle is inserted. 1. A liquid fuel vaporization type combustion device, characterized in that a gap formed between the nozzle mouth side of the jet nozzle and the jet nozzle insertion port is closed with a heat-insulating and heat-retaining sealing member.