JPS6143048Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of the vaporization pot structure in a liquid fuel combustion device that vaporizes liquid fuel and mixes and burns the vaporized gas with combustion air.

As shown in Fig. 1, this type of combustion device sprays liquid fuel under pressure from a nozzle 3 into a vaporizer pot 1 by a pressure pump 2, and at the same time supplies combustion air from a blower 4 through a blower circuit 5. Then, they were sufficiently vaporized and premixed in the vaporizing pot 1 and burned on the burner flame port 6.

Therefore, before starting combustion, it is necessary to preheat the vaporizing pot 1 to the optimum vaporizing temperature using the heater 7 installed inside the vaporizing pot 1.
Also, during combustion, it is possible to turn off the power to the heater 7 and continue combustion by recovering heat through the heat transfer effect of the vaporizer pot 1, but in the latter case, blue clean combustion occurs during combustion, and this Although the heater 7 currently has the characteristic that it is not energized, the fatal flaw of this type of combustion device is that it requires a considerably long preheating time for the vaporization pot 1, especially at the start of combustion, and this makes it difficult for the user to perform the ignition operation. However, the inconvenience and inconvenience of not being able to combust easily occurred even after the heating, and the problem of the power consumed by the heater 7 could not be ignored.

Therefore, shortening the preheating time of the vaporization pot 1 has been a major concern and development theme for those who use and develop this liquid fuel combustion device.

Therefore, conventional methods of shortening the preheating time of the vaporizer pot 1 have been considered to reduce the heat capacity of the vaporizer pot 1 and reduce the heat capacity of the vaporizer pot 1.
However, the above-mentioned method does not solve the problem of power consumption at all, and the diameter of the mixing chamber 12 of the vaporizer 1 is increased in order to reduce the heat capacity of the vaporizer pot 1. If the design is to adjust the height without impairing the heat transfer effect from the burner flame port 6, that is, to make the height h of the mixing chamber 12 of the vaporizing pot 1 as low as possible, then the second
As shown in the figure, a part of the kerosene sprayed from the nozzle 3 and spread over a wide area sometimes passes through the burner flame port 6 in an unvaporized state, and as a result, the kerosene in the vaporizing pot 1 There was a tendency for unstable combustion to occur due to poor vaporization premixing, red flames occurring in some areas, one-sided combustion with lift, and uneven flow.

In contrast, in the present invention, even if the height h of the mixing chamber 12 of the vaporization pot 1 is designed to be as low as possible, it is possible to improve vaporization premixing and expand the stable combustion range. As a result, the preheating time of the vaporizing pot 1 can be shortened and the power consumption can be reduced.An embodiment thereof will be described below with reference to the drawings.

1 is a vaporizing pot, and a nozzle 3 that faces into the vaporizing pot 1 and pressure-sprays the liquid fuel discharged from the pressure pump 2 is at an angle α with respect to the bottom surface of the vaporizing pot 1.
However, combustion air is supplied from the circumferential surface of the nozzle 3 through a blower circuit 5 from a blower 4.
A separate or integral guide plate 9 is provided on the distal end side 8 of the air blowing circuit 5 in the vicinity of the fuel combustion air supply port 11 of the vaporizing pot 1, which is continuous with the air blowing circuit 5.

As shown in FIG. 4, the guide plate 9 is constituted by a cylindrical body having an inclined surface 91 at its tip, so that the tip of the upper wall 92 is closer to the vaporizer pot 1 than the tip of the lower wall 93. It is a long object that protrudes inward. Such a structure of the guide plate 9 controls the spray direction of the pressure-sprayed liquid fuel so that it comes into contact with the optimal position of the inner wall surface of the vaporizing pot by force by air flow, and unvaporized kerosene flows into the mixing ring part 10. This is to ensure sufficient vaporization premixing within the vaporization pot 1 so as not to collide or pass through as is.

Now, when the fuel is sprayed from the nozzle 3, the sprayed fuel is not obstructed by the lower wall 93 of the guide plate 9, and therefore easily spreads over the entire lower part of the vaporizing pot 1. On the other hand, since the air flow near the lower surface of the upper wall 92 is blown out while being guided by the upper wall 92, it is relatively well directed even near the center of the vaporizing pot 1, and exhibits a horizontal flow. As a result, the rise of the atomized fuel spread at the lower part of the vaporization pot 1 is suppressed by the horizontal air flow. Therefore, the sprayed fuel is reliably vaporized and premixed in the inner lower part of the vaporizing pot 1.

In this case, the capacity of the vaporizer pot 1 can be reduced while maintaining good vaporization mixing, that is, the height of the vaporizer pot 1 can be lowered, thereby achieving improved preheating performance, expansion of stable combustion, and miniaturization of the burner itself with a simple structure. It is possible.

In addition, the guide plate 9 is made of a cylindrical body with a tip having an inclined surface 91.
With this configuration, the sprayed fuel is once narrowed down and sprayed at a wide angle in the target direction, but various conditions such as the size of the vaporizing pot 1, the amount of liquid fuel sprayed, the capacity of the heater 7, etc. differ. In this case, it goes without saying that the protruding lengths of the upper wall 92 and lower wall 93 of the guide plate 9 will be changed accordingly.

Furthermore, if the nozzle 3 is placed in the vaporization pot 1 so that it faces slightly downward from the horizontal direction, the fuel to be sprayed will not collide with the mixing ring part 10 while remaining unvaporized, and will not pass through as it is, resulting in a small volume. Although it is a vaporizer pot of 1, it is really efficient,
It is completed in a short time, and since the height h of the mixing chamber 12 of the vaporizing pot 1 is low, the heat transfer effect from the burner flame port 6 can be taken in extremely efficiently even during combustion.

Based on the above configuration, when the heater 7 attached to the vaporizer pot 1 is preheated to the optimum vaporization temperature, combustion air and liquid fuel are sprayed, a vaporized mixed gas is generated in the vaporizer pot 1, and it is combusted on the burner nozzle 6. During combustion, the heater 7 is turned off and combustion is continued by recovering heat from the combustion heat on the burner nozzle 6.

Therefore, the present invention has high practical value as it can reduce the height of the mixing chamber of the vaporization pot while maintaining good vaporization premixing, thereby improving preheating performance, expanding stable combustion, and making it more compact with an extremely simple configuration. It is something.

[Brief explanation of the drawing]

Figure 1 shows a conventional example of a liquid fuel combustion device;
The figure shows a liquid fuel combustion device equipped with a mixing chamber having a height h lower than the height h of the mixing chamber of the vaporization pot in FIG. 1, and FIG. 3 shows a liquid fuel combustion device of the present invention.
FIG. 4 is a perspective view showing the brim-shaped guide plate, which is the main part of the present invention. 1... vaporizing pot, 2... pressure pump, 3...
Nozzle, 4...Blower, 5...Blower circuit, 7...
Heater, 9...Guide plate, 11...Air supply port for fuel combustion, 12...Mixing chamber.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A nozzle for pressure-spraying liquid fuel into the vaporizer pot is exposed through a fuel and combustion air supply port provided in a part of the vaporizer pot having a vaporizer wall at the bottom, Supplying combustion air from around the nozzle,
In a liquid fuel combustion device that performs vaporization, premixing, and combustion in a vaporization pot, the fuel and combustion air supply port is provided with a tip of the upper wall that is longer inward of the vaporization pot than a tip of the lower wall. The protruding guide plate is continuously inserted into the blower circuit of the blower, either integrally or separately, and between the upper wall and the lower wall, a nozzle for spraying liquid fuel under pressure is installed horizontally to the bottom of the vaporizing pot. A liquid fuel combustion device characterized by being installed so as to face slightly downward. 2. The liquid fuel combustion device according to claim 1, wherein the nozzle for spraying the liquid fuel under pressure is provided so as to be directed slightly downward from the horizontal direction with respect to the bottom surface of the vaporizing pot.