JPH0268409A - Liquid fuel burning device - Google Patents

Abstract

PURPOSE:To improve anti-tar performance dispensing with the exchange of a filter by adsorbing tar by the filter while making a fuel passage hardly stopped by the tar even if the tar adheres to a gasification part. CONSTITUTION:A liquid fuel fed from an oil feeding opening 5 to a gasification pipe 4 flows to drop downward and tar efficiently gasified by an inlet filter 25 is made hardly produced. Further, because there is a space layer 26 upward thereof even if the tar is produced to clog the filter 25, the gasification pipe 4 which is a fuel passage is hardly blocked. Furthermore, because a fuel gas gasified once is jetted from a nozzle hole 8 through an outlet filter 27, but the tar is adsorbed by the outlet filter 27, the tar is made hardly to adhere to the nozzle hole 8.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a liquid fuel combustion device for burning liquid fuel, and in particular to a vaporizer tube.

[Prior Art] FIG. 4 is a sectional view showing a conventional liquid fuel combustion device.
In the figure, (1) is a fuel tank, and an electromagnetic pump (2) is installed on its upper surface, and one end of a fuel supply pipe (3) is connected to the electromagnetic pump (2). Refueling pipe (3
) is connected to a fuel filler port (5) that protrudes inside the annular vaporizing pipe (4).

(7) is a nozzle located at the lower center of the annular carburetor (15), which has a nozzle hole (8) at one end of its upper end, and one end of a return pipe (10) is connected to the other end. .

The other end of the return pipe (10) is connected to an electromagnetic solenoid (9), and the other end of the electromagnetic solenoid (9) opens into the fuel tank (1). (11) is the nozzle (7)
It is a communication pipe that communicates the inside of the vaporizer pipe (4) with (
13) is a throat portion located coaxially above the nozzle hole (8). (12) is a preheater disposed outside the vaporizing tube (4). Also, vaporizer pipe (4), nozzle (7)
), etc. and the heater (12) are integrally molded by A, ill die-casting having a throat portion (13) and a heat recovery wall (14) concentrically to form a vaporizer (15).

The heat recovery wall (14) has a flame hole (16) on the inner circumferential side, and a burner head (18) which is either a metal mesh (17) or seam welded is arranged on the outer circumference of the flame hole (16). There is.

The burner head (18) is covered by a burner head gap (19), and the heat recovery wall (14) and the burner head (15) are connected by bolts (20) and nuts (21) cast in AF die-casting. Attach the rad cap (19) to the lower part and the upper part of the burner head (18) and the burner.
) are compressed to maintain airtightness.

(22) is a thermistor screwed into the carburetor (15) near the nozzle (7), and (23) is an electromagnetic solenoid (9) located in the return pipe (10) to open and close the nozzle hole (8). ) is the needle driven by the needle.

A conventional liquid fuel combustion device is configured as described above. For example, when the heater (12) is energized, the vaporizer (15) is heated, and when the vaporization pipe (4) reaches 200 to 300°C, the thermistor (22) is heated. ) detects the temperature and activates the electromagnetic pump (2
) starts operation, and the liquid fuel in the fuel tank (1) passes through the fuel supply pipe (3) or from the fuel supply port (5) to the vaporization pipe (4).
It is supplied inside and heated and vaporized.

At the same time, the needle (
23) is driven, and the nozzle hole (8) of the nozzle (7) is opened. As a result, vaporized fuel is ejected from the nozzle hole (8) toward the inlet of the throat portion (13).

The kinetic energy of this jet causes the throat part (1
At the same time, air is sucked in from the inlet portion of 3), and this sucked air is guided along with the vaporized fuel through the throat portion (13) to the burner head (18) and mixed to form an air-fuel mixture. The air-fuel mixture thus formed is passed through the flame hole (1B) of the burner head (18) through the metal mesh (17).
If it is ignited by an appropriate means, a flame (
24) and burns. From then on, combustion is maintained by the continuously supplied air-fuel mixture. Also, during digestion, the electromagnetic pump (2) stops, and the electromagnetic solenoid (9)
As a result, the nozzle hole (8) is closed by the needle (23), the jetting of the vaporized fuel is stopped, and the flame (24) outside the flame hole (16) is extinguished. At the same time, the vaporized fuel in the vaporization pipe (4) passes through the return pipe (10) to the fuel tank (
Returns to 1).

[Problems to be Solved by the Invention] In the conventional liquid fuel combustion device as described above, the vaporizer (15) having the annular vaporizing pipe (4) is heated by the heater (12>), and the vaporizing pipe (4) A nozzle that heats and vaporizes the liquid fuel supplied from the fuel tank (1) through the fuel filler port (5) into the interior of the tank and connects the vaporized fuel to the vaporization pipe (4) via the communication pipe (]1). (7) is ejected from the nozzle hole (8) toward the inlet of the throat part (13). (hereinafter referred to as "tar")
However, there was a problem in that the liquid directly flows into the nozzle hole (8) and the nozzle is likely to become clogged.

In addition, in order to prevent tar from flowing into the nozzle (7),
As described in Publication No. 17, if the filter is installed so as to completely fill the vaporizing pipe (4), tar tends to adhere to the part of the filter located around the fuel filler port where vaporization takes place, making it difficult to replace the filter. There were some problems, such as the need for

This invention was made in order to solve this problem, and the tar content is adsorbed by the filter, and even if the tar content adheres to the vaporization part, the fuel system path is clogged with tar, and the filter must be replaced. The objective is to obtain a liquid fuel combustion device that eliminates the need for tar and has improved tar resistance.

[Means for Solving the Problems] A liquid fuel combustion device according to the present invention includes an inlet filter located at a predetermined portion of the vaporization pipe at a lower part around the fuel supply port in an annular vaporization pipe that vaporizes liquid fuel. established,
A space layer is formed above the space layer, a fuel supply port is opened in the space layer, and an outlet filter is provided around the communication pipe that communicates with the vaporization pipe.

[Function] In this invention, an inlet filter is provided at a lower part of a predetermined portion of the vaporization pipe around the fuel supply port in the annular vaporization pipe that vaporizes liquid fuel, and the vaporization conditions such as increasing the vaporization area are provided. In order to improve the flow rate and generate tar content, a space layer is formed above which the fuel filler port is opened, and the structure is designed to prevent tar from clogging no matter how many tars land on the inlet filter. Once the tar contained in the vaporized fuel gas is adsorbed by an outlet filter provided around a communicating pipe that communicates with the vaporizing pipe, the tar will not adhere to the nozzle.

[Example] Fig. 1 is a sectional view showing an embodiment of the present invention, Fig. 2 is a sectional view taken along the line A-A in Fig. 1, and Fig. 3 is a sectional view taken along the line B-B in Fig. 1. . In the figure, the same components as those in the conventional example are given the same reference numerals as those in the conventional example, and the explanation of the redundant components will be omitted. (2
5) is located around the fuel filler port (5) in the vaporizer pipe (4).
The inlet filter is provided at the lower part of a predetermined portion of the vaporizing tube (4) extending half way around the circumference of the vaporizing tube (4) with the point 5) at the center, and is made of a metal material such as stainless steel with low activity. (26) is a space layer formed around the fuel filler port (5) in the vaporizer tube (4) at the upper part of a predetermined portion spanning half the circumference of the vaporizer tube (4) with the fuel filler port (5) as the center. . A fuel filler port (5) opens in this space layer (26). (27
) is the entire circumference of the communication pipe (11) on the opposite side of the fuel filler port (5) in the vaporization pipe (4), and extends half around the circumference of the vaporization pipe (4) with the communication pipe (11) as the center. This is an outlet filter provided in the filter, and is made of a highly active metal material such as Cu mesh.

Next, the operation of the above embodiment will be explained.

The combustion operation is the same as before, but the liquid fuel supplied from the fuel filler port (5) into the vaporization pipe (4) flows downward and is efficiently vaporized by the inlet filter (25), making it difficult to generate tar. It has become. That is, the vaporizer tube (4)
The temperature at which the fuel supplied to the inlet vaporizes is approximately 250°C, but even normal kerosene contains components with high boiling points or components that are difficult to vaporize, so these remain as a residual fragrance in the inlet filter (250°C). ). Also, exposed to sunlight,
In the case of degraded and inferior kerosene, the polymerization progresses and there is a large amount of high boiling point content, so there is a large amount of residual fragrance. However, when the inlet filter (25) is provided, the contact area with the fuel increases, the vaporization rate increases, and the amount of residual fragrance is minimized, that is, it becomes difficult to generate tar. Also,
Even if the inlet filter (25) is clogged due to the generation of tar, since there is a space layer (26) above it, the inside of the vaporization pipe (4), which is the fuel system path, is unlikely to be clogged.

Further, the vaporized fuel gas passes through the outlet filter (27) and is ejected from the nozzle hole (8).
27), it becomes difficult for tar to adhere to the nozzle hole (8). In this case, compared to the inlet filter (25), the outlet filter (27)
Because the amount of tar adhesion is small, the outlet filter (27)
There is no need to provide a spatial layer above. The reason for this is that when the vaporized gas passes through the outlet filter (27), the high boiling point components contained in it are adsorbed, but as mentioned above, the inlet filter (25) adsorbs a considerable amount of the high boiling point components in advance. Therefore, the high boiling point content contained in the vaporized gas is small. Therefore, the exit filter (27
), the amount of tar adhering to the outlet filter (2) will be reduced.
7) There is no need to provide a space layer above.

Furthermore, the reason why the inlet filter (25) is made of a metal material with low activity and the outlet filter (27) is made of a metal material with strong activity is that the vaporization rate is increased by providing the inlet filter (25). This is because, in addition to wanting to reduce the vaporized residual fragrance as much as possible, it also reduces polymerization during vaporization, which leads to less clogging of the nozzle (7). That is, the inlet filter (2
By using a metal material with low activity in 5), polymerization is suppressed and vaporized residual fragrance is reduced, and by using a metal material with strong activity in the Hadero filter (27), the residual odor contained in the vaporized gas is reduced. The nozzle (
This is to prevent high boiling point components from being included in the vaporized gas supplied to step 7).

In the above embodiment, the inlet filter (25) and the outlet filter (27) are made of metal mesh, but they may also be made of metal mesh with a surface coating, or they may be made of metal mesh instead of mesh. It may be a sintered metal, a foamed metal, a wool-like metal, a porous ceramic, or the like.

In addition, although a system in which primary air is sucked in using the energy of fuel gas has been shown, even in a system in which primary air is forcibly blown, if the fuel vaporization section has a similar configuration, it is possible to The same action and effect can be obtained.

[Effects of the Invention] As explained above, the present invention provides an inlet filter at the lower part of a predetermined portion of the vaporization pipe around the fuel supply port around the fuel supply port for vaporizing liquid fuel, and improves the vaporization conditions such as increasing the vaporization area. In order to improve the flow rate and generate tar content, a space layer is formed above the area around the fuel filler port to open the fuel filler port, so that even if tar adheres to the inlet filter, the tar will not clog the filter. The tar contained in the fuel gas once vaporized in the vaporization pipe is adsorbed by the outlet filter installed around the communication pipe that communicates with the vaporization pipe, making it difficult for tar to adhere to the nozzle and making it more durable. This has the effect of improving the barrel performance.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an embodiment of the present invention, Fig. 2 is a sectional view taken along the line A-A in Fig. 1, Fig. 3 is a sectional view taken along the line B-B in Fig. 1, and Fig. 4 is a sectional view taken along the line B-B in Fig. 1. 1 is a cross-sectional view showing a liquid fuel combustion device of FIG. In the figure, (4) is the vaporizer pipe, (5) is the fuel filler port, (25)
) is the inlet filter, (26) is the spatial layer, and (27) is the outlet filter. In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] A liquid comprising: a vaporization pipe that vaporizes liquid fuel supplied from a fuel tank through a fuel filler port; a communication pipe that supplies fuel gas vaporized in the vaporization pipe to a nozzle; and a nozzle that injects the vaporized fuel gas. In the fuel combustion device, an inlet filter is provided at a lower portion of a predetermined portion of the vaporizer pipe around the fuel filler port in the vaporizer pipe;
A liquid fuel combustion device characterized in that a space layer is formed above the space layer, a fuel filler port is opened in the space layer, and an outlet filter is provided in a peripheral portion of the communication pipe that communicates with the vaporization pipe.