JPS6020009A - vaporizer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a vaporizer that vaporizes liquid fuel, mixes it with combustion air, and supplies an air-fuel mixture to a combustion section.

A conventional vaporizer of this type is shown in FIG. 1 and will be described below. On the side wall of the vase-shaped vaporizer cylinder 2 heated by the heater 1,
A fuel inlet 5 and an air inlet 6 connected to the fuel pump 3 and combustion fan 4, respectively, are open. Also, vaporizer cylinder 2
a mixing plate 8 with a mixture passage 7 in its upper opening;
A throat 10 is disposed in a burner in which a flame opening 9 is formed, a vaporizing chamber 11 is defined by a vaporizing tube 2 and a mixing plate 8, and a mixing chamber is provided between the mixing plate 8 and the burner head 10. 12 are divided. In the above configuration, the heater 1
is energized to heat the vaporization cylinder 2, and when the temperature reaches a predetermined temperature, the fuel pump 3 and combustion fan 4 are activated to supply liquid fuel and combustion air to the vaporization chamber 11. Vaporization chamber 1
The liquid fuel that has entered 1 is vaporized on the inner wall surface of the vaporization cylinder 2, mixed with combustion air, and enters the mixing chamber 12 through the mixture passage 7.

The air-fuel mixture that has entered the mixing chamber 12 is further uniformly mixed there, is ejected from the flame port 9 of the burner head 10, and is ignited by an ignition device (not shown) to cause combustion.

However, in the above conventional example, the vaporization wall temperature is 230
When fuels that are low (about 280°C to 280°C) and tend to turn into tar, such as denatured oil or heavy oil, are vaporized, tar adheres to the inner wall of the vaporizer cylinder 2, making it difficult to ignite and creating a strong odor after the fire is extinguished. . In general, the components contained in fuel that easily turn into tar are high boiling point components, and the formation and adhesion of tar can be prevented by increasing the vaporization wall temperature, but in the conventional example above, increasing the vaporization wall temperature does not allow stable vaporization. Ta. That is, the liquid fuel sent out from the fuel filler port 5 collides with the side wall surface 13 (hereinafter referred to as the landing surface) of the vaporizer tube 2 facing the fuel filler port 5, but because the wall surface is high temperature, a portion of the liquid fuel is vaporized. As a result, most of the particles are dispersed and fall to the bottom of the vaporization cylinder, where they are vaporized in the form of fine particles. However,
Either the combustion air is blown out toward the side wall of the vaporization cylinder together with the liquid fuel, or it tries to flow toward the air-fuel mixture passage at the top of the vaporization chamber 11, causing the combustion air to flow upwards, causing the liquid fuel to flow upward. There was only a weak air current at the bottom of the vaporizer cylinder where the electrification took place.

Therefore, the vaporization promotion effect (scavenging effect) by removing the fuel vapor layer from the bottom of the vaporization cylinder is not sufficient, and not only does the vaporization time of fuel particles become longer, but also they vaporize irregularly after coalescing into giant particles. As a result, stable vaporization was not performed, and the combustion in the burner head 10 was also unstable, causing flames to form or, in extreme cases, misfires.

Purpose of the Invention The present invention solves the above-mentioned drawbacks of the conventional example, and aims to extend the life of the vaporizer by preventing the formation and adhesion of tar even when vaporizing denatured oil or heavy oil. The purpose is to obtain a vaporized state.

Structure of the Invention In order to achieve this object, the present invention provides an air guide on the bottom surface of the vaporization cylinder for sending combustion air together with liquid fuel into the vaporization chamber, and also provides a means for the combustion air sent from this air guide to flow into the bottom surface of the vaporization cylinder. The air guide is configured to flow along the air.

With this configuration, fuel particles that are split and scattered on the high-temperature side wall of the carburetor cylinder and fall to the bottom of the carburetor are rapidly vaporized and stabilized by the scavenging effect of the combustion air that flows along the bottom of the carburetor sent out from the air guide. A lot of C conversion is done. Further, since vaporization is performed by the high-temperature vaporization wall surface, generation and adhesion of tar are prevented.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to FIGS. 2 to 4.

At the center of the bottom surface of the pot-shaped vaporizer cylinder 2 heated by the heater 1, a fuel supply pipe 5 and a blower pipe 6 are arranged, which are connected to a fuel pump 3 and a combustion fan 4, respectively. Further, a mixing plate 8 with a mixture passage 7 is provided at the upper opening of the vaporizing cylinder 2, and a large number of small holes 9 are provided in the upper part of the mixing plate 8.
A rectifying tube 10 provided with a rectifying tube 10 and a rectifying space 11 surrounding it
A wire mesh combustion tube 12 and a rectifier tube 10 are arranged through the
A combustion section is provided, which is constituted by a mixture gap 13 that closes the upper end of the combustion tube 12. Further, a glass outer cylinder 16 whose upper end is closed by an exhaust gap 14 and forms a combustion space 15 with the combustion cylinder 12 is disposed around the combustion cylinder 12, and a lower end of the outer cylinder 16 is arranged to form a combustion space 15 with the exhaust gap 14. It is supported by an exhaust pipe 18 which is installed on the outer periphery of the cylinder 2 and has an exhaust port 17 in its side wall. - In the vaporizing chamber 19 divided by the vaporizing cylinder 2 and the mixing plate 8, there is a shielding plate 21 disposed facing the combustion air supply port 20 opened at the center of the bottom of the vaporizing cylinder 2, and a shielding plate integrally provided therewith. An air guide is provided, which includes a side wall 22 extending from the outer periphery of the plate 21 to the bottom surface of the vaporizing cylinder 2, and a heat shield plate 23 provided inside the side wall 22. Also, the shielding plate 21 provides combustion air! #] The surface of the shielding plate 21 is larger than that of the shielding plate 20, and the surface facing the combustion air supply port 20 is formed into an upwardly convex shape. part is high. Furthermore, there is a combustion air outlet 2 in the air guide as shown in Figure 3.
A swirl passage 27 is formed by the guide vanes 25 and the lower guide plate 26 so that the combustion air blown from the combustion air 4 swirls and is blown into the vaporization chamber 19. Refueling nozzle 28 connected to
are placed horizontally and open.

Next, the operation will be explained. When the heater 1 is energized and the vaporization tube 2 is heated to a predetermined temperature, the combustion fan 4 and the fuel pump 3 are activated, and the combustion air is sent to the combustion air tube 6, the combustion air supply l-120, and the combustion air blower of the air guide. Exit 24
At the same time, the liquid fuel is delivered to the vaporization chamber 19 through the fuel supply pipe 5 and the fuel nozzle 28, and collides with the side wall of the vaporization cylinder 2. Since the landing surface of the fuel on the side surface of the vaporization cylinder is high temperature, most of the liquid fuel splits into fine particles and falls to the bottom surface of the vaporization cylinder 2. On the other hand, combustion air enters the air guide upward from the combustion air supply port 2o at the bottom of the carburetor, but the convex shielding plate 21 and the combustion air supply port 2o are also located outside and the convexity of the shielding plate 21 is Combustion air is rectified into a downward flow by the combustion air outlet opening at a lower position, and is sent along the bottom surface of the vaporizer cylinder as a downward swirling flow through the swirling passage 27. For this reason, liquid fuel particles that have fallen to the bottom of the vaporization cylinder are strongly affected by the scavenging effect of the combustion air, so even if the wall surface temperature is high, the fuel particles can move quickly on the bottom of the vaporization cylinder due to swirling flow. , and stable vaporization can be obtained. The heat shield plate 23 is the air guide shield plate 21
and protecting the shielding plate 21 and the side wall 22, which are kept at a relatively high temperature in order to prevent re-liquefaction of the air-fuel mixture on the side wall 22, from being cooled by the combustion air;
It plays the role of a heat insulating material to prevent the fuel supply nozzle from becoming hot, and is integrated with the guide vane 25 in this embodiment. The vaporized liquid fuel is mixed with combustion air, and the mixture plate 8
The mixture is further uniformly mixed and rectified in a mixing chamber 29 formed inside the combustion section. Furthermore, the air-fuel mixture is ejected through the small hole 9 of the rectifier tube 10 and is ignited (the ignition device is not shown).
Combustion occurs on the surface of the combustion tube 12, and the combustion tube 12 becomes red hot due to the combustion heat. Radiant heat due to red heat is dissipated through the glass outer cylinder 16, and high-temperature exhaust gas flows to the lower part through the combustion space 15 and is exhausted through the exhaust port 17 of the exhaust pipe 18. The vaporizer cylinder 2 is heated by contacting the wall, and heat is recovered to the vaporizer cylinder.

In this embodiment, a swirling passage 27 is provided in the air guide to swirl the combustion air and send it to the vaporization chamber 19, but it is not necessary to create a swirling flow as in the embodiment shown in FIG.

Effects of the Invention As is clear from the above explanation, according to the dumb invention, the air guide provided at the center of the bottom of the carburetor cylinder is made larger than the combustion air supply port, and the combustion air outlet is provided on the side wall of the air guide. By raising the surface of the air guide facing the combustion air supply port at the upper end, the combustion air can be sent out along the bottom surface of the carburetor cylinder as a downward flow.
The liquid fuel vaporizes rapidly and stably on the hot wall surface. Further, since vaporization is performed on the high-temperature wall surface, even if liquid fuel that easily turns into tar, such as altered oil, is vaporized, generation and adhesion of tar on the vaporization wall surface can be prevented. Furthermore, since the vaporization is carried out on the entire bottom surface of the vaporization cylinder, the vaporization load on the vaporization wall surface is small, and the decrease in wall surface temperature is small, so that tar formation can be suppressed.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing a conventional vaporizer, FIG. 2 is a longitudinal cross-sectional view of a vaporizer according to an embodiment of the present invention, and FIG.
FIG. 4 is a sectional view taken along line AA in the figure, and FIG. 4 is a sectional view taken along line AA of another embodiment. 1... Heater, 2... Vaporizer cylinder, 3...
...Refueling pump, 4... Combustion fan, 6.
...Blower tube, 21...Block plate, 22...
... Side wall, 23 ... Heat shield plate, 24 ...
... Combustion air outlet, 25 ... Guide vane, 26
...Lower guide plate, 27...Swivel passage. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3

Claims (3)

[Claims] (1) A pot-shaped vaporization tube heated by a heater, a blower tube connected to a combustion air supply port opened at the bottom of the vaporization tube and equipped with a combustion air supply means and a fuel supply means, and an inside of the vaporization tube. and an air guide provided on the bottom surface of the vaporizer cylinder for blowing out combustion air supplied from the blower cylinder along the bottom surface of the vaporizer cylinder. (2) The air guide is constituted by a shielding plate disposed opposite to the combustion air supply port and a side wall extending from the outer periphery of the shield plate to the bottom surface of the carburetor cylinder, and the combustion air outlet provided in this side wall is connected to the combustion air supply port. 2. The vaporizer according to claim 1, wherein the shielding plate is located on the outside, and the portion of the shielding plate facing the combustion air supply port is higher than the upper end of the combustion air outlet. (3) The vaporizer according to claim 2, wherein a swirling passage formed by a guide vane and a lower guide plate is formed in the air guide so as to blow out combustion air into the vaporizing cylinder in a swirling direction.