JPH0136005B2 - - Google Patents

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.

Conventional configuration and its problems A conventional vaporizer of this type is shown in FIG. 1 and will be described. A fuel pump 3 and a combustion fan 4 are installed on the side wall of the pot-shaped vaporization cylinder 2 heated by the heater 1.
A fuel supply port 5 and an air supply port 6, which are respectively connected to the fuel supply port 5 and the air supply port 6, are open. Further, a mixing plate 8 in which a mixture passage 7 is formed and a burner head 10 in which a burner port 9 is formed are arranged at the upper opening of the vaporizing cylinder 2. A vaporizing chamber 11 is defined between the mixing plate 8 and the burner head 10, and a mixing chamber 12 is defined between the mixing plate 8 and the burner head 10. 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. The liquid fuel that has entered the vaporization chamber 11 is vaporized on the inner wall surface of the vaporization cylinder 2, mixed with combustion air, and passed through the mixture passage 7 to the mixing chamber 12.
to go into. The air-fuel mixture that has entered the mixing chamber 12 is further mixed uniformly 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 as low as about 230°C to 280°C, and when fuel that easily turns into tar, such as denatured oil or heavy oil, is vaporized, tar adheres to the inner wall of the vaporizing cylinder 2, causing ignition. The drawback was that it was difficult to use, and the odor was strong after the fire was 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 is transferred to the vaporizer cylinder 2.
The fuel collides with the side wall surface 13 (hereinafter referred to as the landing surface) opposite to the fuel filler port 5, but because the wall surface is high temperature, only a part of it vaporizes, and most of it disperses as fine particles. It falls to the bottom and vaporizes in the form of fine particles. However, the combustion air is not only blown out toward the side wall of the vaporization cylinder together with the liquid fuel, but also tries to flow toward the mixture passage at the top of the vaporization chamber 11, causing the combustion air to flow upward, causing the liquid fuel to flow upward. There was only a weak air current at the bottom of the vaporizer cylinder where fuel vaporization took place. As a result, 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 the fuel particles become longer, but also they vaporize irregularly after coalescing with each other to form giant particles. As a result, stable vaporization was not performed, and combustion in the burner head 10 was also unstable, resulting in flame formation or, in extreme cases, misfire.

Purpose of the Invention The present invention is intended to eliminate the above-mentioned drawbacks of the conventional example, and 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 having a plurality of air outlets opened in the side wall for blowing out combustion air along the bottom surface of the carburetor cylinder, and an air guide arranged in the air guide to blow out fuel horizontally. It is composed of a plurality of oil supply nozzles that discharge oil in different directions.

With this configuration, the 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 absorbed by the scavenging effect of the combustion air that flows along the bottom of the carburetor and is sent out from the air guide. Stable vaporization is performed. 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.

A refueling pump 3 and a combustion fan 4 are installed at the center of the bottom surface of the pot-shaped vaporizer cylinder 2 heated by the heater 1.
A fuel filler port 5 and a blower tube 6 are provided, which are respectively connected to the fuel filler port 5 and the blower tube 6, respectively. Further, a mixing plate 8 with a mixture passage 7 is provided at the upper opening of the vaporizing cylinder 2, and a rectifying cylinder 10 with a large number of small holes 9 is provided in the upper part thereof, and a rectifying space 11 is provided around the mixing plate 8. The combustion tube 12 made of wire mesh is further connected to the rectifier tube 1.
A combustion section is provided, which is comprised of a fuel-air mixture cap 13 that closes the upper end of a combustion tube 12. Further, around the combustion tube 12, a glass outer tube 16 whose upper end is closed by an exhaust cap 14 and forms a combustion space 15 between the combustion tube 12 and the combustion tube 12 is provided.
The lower end of the outer tube 16 is supported by an exhaust tube 18 which is disposed around the outer periphery of the carburetor tube 2 and has an exhaust port 17 in its side wall. On the other hand, the vaporization chamber 19 partitioned by the vaporization tube 2 and the mixing plate 8 includes a shielding plate 21 disposed facing the combustion air supply port 20 opened at the center of the bottom surface of the vaporization tube 2, and a shielding plate 21 that is integrated with the shielding plate 21. An air guide is provided, which includes a side wall 22 extending from the outer periphery of the shielding plate 21 to the bottom surface of the vaporization cylinder 2, and a heat shielding plate 23 provided inside the sidewall 22. The shielding plate 21 is larger than the combustion air supply port 20 and has a surface facing the combustion air supply port 20 formed into an upwardly convex shape, so that the upper end of the plurality of combustion air outlets 24 opened in the side wall 22 of the shielding plate 21 is larger than the combustion air supply port 20 . Also, the convex portion of the shielding plate 21 is raised. Further, inside the air guide, as shown in FIG.
5 and the lower guide plate 26 is formed, and a plurality of refueling nozzles 28 connected to the refueling pipe 5 are arranged horizontally and open along the revolving passage 27. .

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 combustion air is supplied to the blow tube 6, the combustion air supply port 20, and the combustion air outlet of the air guide. At the same time, the liquid fuel is supplied to the vaporization chamber 19 through the fuel supply pipe 5 and the fuel supply nozzle 28, and collides with the side wall of the vaporization cylinder 2. Since the landing surface of the fuel on the side of the vaporization cylinder is high temperature, most of the liquid fuel splits into fine particles and falls to the bottom of the vaporization cylinder 2, and since there are multiple landing surfaces, the fuel fine particles fall into the vaporization cylinder. It will spread over the entire bottom of 2. Combustion air enters the air guide upward from the combustion air supply port 20 on the bottom of the carburetor, but is located outside of the convex shielding plate 21 and the combustion air supply port 20 and lower than the convex portion of the shielding plate 21. Combustion air is rectified into a downward flow by the combustion air outlet opened at the position, and is sent out along the bottom surface of the carburetor cylinder as a downward swirling flow through the swirl passage 27. For this reason,
Liquid fuel particles that have fallen to the bottom of the vaporization cylinder can be strongly scavenged by the combustion air, so even if the wall surface temperature is high, the fuel particles can rapidly move along the bottom of the vaporization cylinder due to swirling flow. Vaporizes and provides stable vaporization. The heat shield plate 23 prevents the shield plate 21 and side wall 22, which are kept at a relatively high temperature in order to prevent re-liquefaction of the air-fuel mixture on the shield plate 21 and side wall 22 of the air guide, from being cooled by the combustion air. It serves as a heat insulating material to protect and prevent the fuel nozzle from becoming hot, and in this embodiment, it is integrated with the guide vane 25. The vaporized liquid fuel is mixed with combustion air, passes through the mixing plate 8, and is further uniformly mixed and rectified in a mixing chamber 29 formed inside the combustion section. Further, the air-fuel mixture is ejected from the small hole 9 of the straightening tube 10, is ignited (the ignition device is not shown), and 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 from the exhaust port 17 of the exhaust pipe 18. The vaporizer cylinder 2 is heated by contact with the vaporizer cylinder 2, 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 description, according to the present 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 a plurality of combustion air blowers provided on the side wall of the air guide are made larger than the combustion air supply port. By making the surface of the air guide facing the combustion air supply port higher than the upper end of the outlet, combustion air can be sent out along the bottom of the vaporizer cylinder as a downward flow. vaporization occurs rapidly and stably. 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 fuel is supplied over a wide area by multiple fuel supply nozzles, vaporization takes place over the entire bottom of the vaporization cylinder, reducing the vaporization load on the vaporization wall and minimizing the drop in wall temperature, which suppresses tar formation. can do.

[Brief explanation of drawings]

Fig. 1 is a vertical cross-sectional view showing a conventional vaporization device;
The figure is a longitudinal cross-sectional view of a vaporizer showing one embodiment of the present invention, FIG. 3 is a cross-sectional view taken along the line A-A in FIG. 2, and FIG. 4 is a cross-sectional view taken along the line A-A of another embodiment. be. 1... Heater, 2... Evaporation tube, 3... Refueling pump, 4... Combustion fan, 6... Blower tube, 21...
Shielding plate, 22... side wall, 23... heat shielding plate, 24...
...Combustion air outlet, 25... Guide vane, 26...
Lower guide plate, 27... turning passage.

Claims (1)

[Scope of Claims] 1. A vaporizing cylinder which is heated by a heater and has a cylindrical shape with a bottom and whose central axis is arranged vertically, and a combustion air supply port connected to a combustion air supply port opened at the bottom of the vaporizing cylinder and which is connected to a combustion air supply port opened at the bottom of the vaporizing cylinder. a blower tube provided with means, and a plurality of air outlet ports disposed on the bottom surface of the carburetor tube opposite to the combustion air supply port, and on the side wall thereof for blowing out combustion air from the blower tube along the bottom surface of the carburetor tube. A vaporizer equipped with an open air guide and a plurality of refueling nozzles that are disposed within the air guide from within the blow cylinder, with their tips facing the air outlet and facing approximately horizontally or slightly downward. 2. The air outlet opened in the air guide side wall is located outside the combustion air supply port, and
The vaporizer according to claim 1, wherein the central portion of the air guide is higher than the upper end of the air outlet. 3. The vaporizer according to claim 1, further comprising a swirl passage formed by a guide vane and a lower guide plate within the air guide so as to blow out combustion air into the vaporizer cylinder in a swirling direction.