JPH0297808A - Combustion device for liquid fuel - Google Patents

Abstract

PURPOSE:To enable the setting of a filter at an accurate position inside a vaporizer tube by forming a vaporizer tube comprising an upper outer casing and a lower outer casing each in the shape of a ring and with a U-shaped cross section and joined to the other at the inner and outer circular ends fitting together. CONSTITUTION:A vaporizer tube 5A forming a vaporizing chamber 4A is formed of an upper outer casing 51, which is ring-shaped and has a U-shaped cross section, and a lower outer casing 52 having a similar shape. The two outer casings 51, 52 are fitted one on the other at the opposing ends and welded at the inner and outer circular ends as welds 53, 54 for jointing and sealing. A combustion device for liquid fuel equipped with the vaporizing chamber 4A is free of dislocation of an inlet filter 8 and an outlet filter 9 so that liquid fuel fed by a feed oil pipe 6 evenly permeates the inlet filter 8, uniformly heated, and vaporizes at the interfacial area between the lower outer casing 52 and the inlet filter 8. Since there is no gap between the inlet filter 8 and the lower outer casing 52, it does not occur for liquid fuel to stand in the vaporization process so that the vaporization can be stabilized without involving a pulsation, bumping, and the like.

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to a liquid fuel combustion device for burning liquid fuel, and particularly to an improvement in the structure of its vaporization chamber. [Prior Art] Fig. 5 is a sectional view showing a conventional liquid fuel combustion device.
7 are a plan view and a sectional view showing the structure of the vaporization chamber. In these figures, 1 is a fuel tank, and an electromagnetic pump 2 is installed on the upper surface of the fuel tank, and one end of a refueling vibrator 3 is connected to the electromagnetic pump 2. The other end of the refueling vibrator 3 is connected to a refueling lobe 6 that protrudes into the inside of a hollow annular vaporizing tube 5 that constitutes the vaporizing chamber 4 . As shown in detail in FIGS. 6 and 7, around the refueling robot 6, an inlet filter 8 made of metal mesh or the like is spread over about half the circumference of the vaporizer tube 5 and has a space 7 in the upper part of the vaporizer tube 5. It is being An outlet filter 9 such as a metal mesh is spread all over the other half of the vaporizing tube 5 . A communication vibrator 11 is connected from the center of the outlet filter 9 to the nozzle 10 . Nozzle 10
is located at the lower center of the annular vaporizing chamber 4, and has a nozzle hole 12 at one end of its upper end, and one end of a return pipe 13 is connected to the other end. The other end of the return pipe 13 is connected to an electromagnetic solenoid 15 having a needle 14 , and the other end of the electromagnetic solenoid 15 opens into the fuel tank 1 . 16 is a throat portion coaxially located above the nozzle hole 12. 17 is a preheating heater arranged outside the vaporization chamber 4, and the vaporization chamber 4, nozzle 10, etc., and the heater 17 are concentrically connected to the throat portion 16 for heat recovery! The carburetor 19 is integrally molded by aluminum die-casting having a diameter of 18. The heat recovery wall 18 has a flame hole 20 on the inner peripheral side, and the flame hole 20
A burner head 22 to which a metal mech L21 is seam-welded is disposed on the outer periphery of the burner head 22. This burner head 22 is covered with a burner head cap 23, and is fitted with bolts 24 and nuts 25 cast into aluminum die-casting.
, the vaporizer 1 is connected via the burner head cap 23.
It is fixed on 9. 26 is a thermistor screwed into the vaporizer 19 near the nozzle 10. Next, the operation will be explained. When the heater 17 is energized, the vaporizer 19 is heated, and the vaporization chamber 4 is heated to 200 to 300
When the temperature reaches ℃, the temperature is detected by the thermistor 26, the electromagnetic pump 2 starts operating, and the liquid fuel in the fuel tank 1 is supplied from the refueling robot 6 to the inside of the vaporizing pipe 5 through the refueling pipe 3, and the inlet filter 8 and is dispersed and heated and vaporized. Furthermore, tar contained in the vaporized fuel gas is captured by an outlet filter 9 and sent to a nozzle 10. At the same time, the electromagnetic solenoid 15 causes the needle 1 to
4 is driven, and the nozzle hole 12 of the nozzle 10 is opened. This allows vaporized fuel to flow from the nozzle hole 12 to the throat portion 1.
The air is ejected toward the center of the inlet of the fuel cell 6, and air is sucked in from the surrounding area by the kinetic energy of this ejection, and is guided to the burner head 22 through the throat portion 16 to form a uniform air-fuel mixture. This air-fuel mixture is ejected to the outside from the flame hole 20 of the burner head 22 through the metal mech L21, and is ignited by an appropriate means to form a flame 27 and burn. From then on, combustion is maintained by the continuously supplied air-fuel mixture. Also, during digestion, the electromagnetic pump 2 stops, and
The nozzle hole 12 is closed by the needle 14 by the electromagnetic solenoid 15, the ejection of vaporized fuel is stopped, and the flame hole 2 is closed by the electromagnetic solenoid 15.
The flame 27 around 0 is extinguished. At the same time, the vaporized fuel in the vaporization chamber 4 is returned to the fuel tank 1 through the return pipe 13. By the way, in manufacturing the vaporization chamber 4 in the conventional liquid fuel combustion device mentioned above, first, as shown in FIG. Insert the inlet filter 8 and the outlet filter 9 to the center, then bend them into a circular shape as shown in FIG. The refueling lever 6 and the communication pipe 11 were brazed together to produce a vaporizing pipe 5 as shown in FIG. 6, which was integrally molded by aluminum die casting.

[Problem to be solved by the invention]

However, in the configuration of the vaporization chamber as described above, it is difficult to accurately insert the inlet filter 8 and the outlet filter 9 into the straight pipe 5a, and it is also difficult to confirm the insertion state thereof. In particular, the inlet filter 8 is not spread over the entire surface, but has a certain amount of space at the top in order to stabilize the vaporization of the liquid fuel and to prevent as much as possible the filter from clogging due to adhesion of tar contained in the liquid fuel. The inlet filter 8 must be inserted leaving the part 7 intact, and the inlet filter 8 tends to shift up and down during this insertion, making the mounting position unstable. Moreover, when this straight pipe 5a is bent into a circular shape, the inlet filter 8
Also, the outlet filter 9 may be displaced in the circumferential direction, and such positional displacement causes the problem that vaporization becomes unstable. Furthermore, for this reason, it takes a lot of effort to insert the filter 8.9, and the straight pipe 5a
There were problems such as high cost because it required bending. The present invention has been made to solve the above-mentioned conventional problems, and its first purpose is to provide a liquid fuel combustion device in which it is easy to install a filter in an accurate position in a vaporizing pipe. It's about getting. A second object of the present invention is to obtain a liquid fuel combustion device in which the position of a filter installed in a vaporizing pipe is more reliably prevented from shifting both in the vertical direction and in the circumferential direction. [Means for Solving the Problems] A liquid fuel combustion device that achieves the first object of the present invention includes a vaporization chamber for vaporizing liquid fuel, a hollow ring-shaped vaporization pipe as described above, and this vaporization pipe. An inlet filter is laid out so that there is a space above it on the fuel filler side, and an outlet filter is laid all over the inside of the vaporization pipe on the fuel gas outlet side, which supplies the vaporized fuel in the vaporization pipe to the nozzle. In the liquid fuel combustion apparatus, the vaporizing tube is constructed from a ring-shaped upper shell and lower shell, each having a U-shaped cross section and having the mating ends of the inner and outer peripheries joined together. Furthermore, in order to achieve the second object, a constricted portion for pressing the inlet filter is provided in the portion of the upper outer shell on the fuel filler port side. [Function] In the present invention, when assembling the inlet filter and the outlet filter, since the vaporizing pipe is separated into an upper outer shell and a lower outer shell, it is easy to attach the filter, and the attachment position can be confirmed. can. Furthermore, since the filter is in close contact with the inner wall of the outer shell, no displacement occurs due to frictional force. As described above, since there is no displacement of the filter, stable vaporization is performed in the main vaporization chamber. Furthermore, since the inlet filter is held down by the constricted portion of the upper outer shell, displacement of the inlet filter in the vertical direction is more reliably prevented, and displacement of the inlet filter and the outlet filter in the circumferential direction is also prevented. [Example] Hereinafter, an example of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view of a liquid fuel combustion device according to this embodiment.
2 is a plan view showing the structure of the vaporization chamber shown in FIG. 1, FIG. 3 is a sectional view taken along the line AA in FIG. 2, and FIG. 4 is a sectional view taken along the line BB in FIG. 2. In these figures, No. 5 shows the conventional example.
Components that are the same as those shown in FIGS. 7 to 7 are designated by the same reference numerals, and explanations thereof will be omitted. 4A indicates an improved vaporization chamber, and a vaporization pipe 5A forming this vaporization chamber 4A is composed of a ring-shaped upper outer shell 51 having a U-shaped cross section and a lower outer shell 52 having a similar shape. Then, the outer shells 51 and 52 are faced and butted, and the inner and outer peripheries of the butted ends are welded 53.
．． 54 and is sealed and joined. The outer shells 51 and 52 are usually made by pressing (drawing). Therefore, the lower outer shell 52 is refueled by the refueling robot 6.
and the communication vibrator 11 are brazed, and the inlet filters 8 are laid in the lower outer shell 52 over about half the circumference around the refueling donkey vibe 6, and stacked up to the extent that the height thereof is slightly higher than the upper end of the lower outer shell 52. Furthermore, outlet filters 9 are stacked on the remaining half circumference of the lower outer shell 52 to a height approximately twice or more than the depth of the lower outer shell 52, with the communication vibe 11 as the center. Next, in this state, the upper outer shell 51 is placed on top, and the inner and outer peripheries of the abutted ends are welded as described above. As a result, a space 7 exists above the inlet filter 8, and the outlet filter 9 is placed entirely inside the upper outer shell 51 and the lower outer shell 52. By integrally molding the vaporizing tube 5A manufactured in this manner by aluminum die casting, a vaporizing chamber 4A as shown in FIG. 1 is formed. Since the vaporization chamber 4A is configured as described above, the inlet filter 8. Assembly of the outlet filter 9 is easy. Moreover, the position can be confirmed before welding the outer shell 51, 52. Further, since the inlet filter 8 and the outlet filter 9 are in close contact with the inner wall of the outer shell, they do not move due to the frictional force with the inner wall of the outer shell, so that no displacement occurs in the vertical direction or the circumferential direction. The operation of the present liquid fuel combustion apparatus equipped with the vaporization chamber 4A is the same as that of the conventional example described above, but since the inlet filter 8 and the outlet filter 9 are not displaced, the refueling lobe 6
The supplied liquid fuel evenly permeates the inlet filter 8 and is heated uniformly, and vaporizes near the interface between the lower outer shell 52 and the inlet filter 8. During this vaporization, the inlet filter 8
Since there is no gap between the lower shell 52 and the lower shell 52, stable vaporization without pulsation, bumping, etc. is possible without causing accumulation of liquid fuel. Even if the upper outer shell 51 and the lower outer shell 52 have the same cross-section at any position in the circumferential direction, they exhibit the above-mentioned effects, but as shown in FIGS. 2 to 4, If a constriction part 55 is provided at an appropriate location around the refueling donkey vibe 6 on the part of the upper shell 51 on the inlet filter 8 side, the constriction part 55 presses the inlet filter 8, thereby preventing vertical displacement of the inlet filter 8. prevent it more reliably. At the same time, displacement of the inlet filter 8 and the outlet filter 9 in the circumferential direction is also prevented. In the above embodiment, the inlet filter 8 and the outlet filter 9 are made of metal mesh.
Other porous metals, foam metals, wool-like metals, etc. may also be used. In addition, outer shells 51 and 52. Although welding and brazing are used to join the outer shell 52, the refueling lever 6, and the communication pipe 11, other joining methods such as caulking may be used. [Effects of the Invention] As described above, according to the present invention, when assembling the inlet filter and the outlet filter, the vaporizing pipe is separated into the upper outer shell and the lower outer shell, so it is extremely difficult to attach the filter. It's easy. Moreover, you can also check the mounting position. Furthermore, since the filter is in close contact with the inner wall of the outer shell, no displacement occurs. As a result, stable vaporization without pulsation, bumping, etc. is carried out in the main vaporization chamber. In addition, the structure of the vaporizing tube is simple and easy to assemble, so costs can be reduced. Furthermore, since the inlet filter is held down by the constriction of the upper shell, vertical displacement of the inlet filter is more reliably prevented, and this also reliably prevents circumferential displacement of the inlet and outlet filters. There is an effect that it can be done.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing one embodiment of the present invention, and FIG.
A plan view showing the configuration of the vaporization chamber in the figure, Figure 3 is A- in Figure 2.
4 is a sectional view taken along line B-B in FIG. 2, FIG. 5 is a sectional view showing a conventional liquid fuel combustion device, and FIGS. 6 and 7 are views of the vaporization chamber shown in FIG. 5. A plan view and a sectional view showing the configuration,
FIGS. 8(a) and 8(b) are explanatory diagrams showing the manufacturing process of a conventional vaporizing tube. 4A... Vaporization chamber 5A... Vaporization tube 6... Refueling vibrator 7... Space section 8... Inlet filter 9... Outlet filter 10... Nozzle 11... Communication vibe 51... - Upper outer shell 52...lower outer shell 55...constriction portion In the drawings, the same reference numerals indicate the same or equivalent parts. Figure Agent Patent Attorney Muneharu Sasaki Figure Figure Figure Figure Figure (b)

Claims (2)

[Claims] (1) A vaporization chamber for vaporizing liquid fuel includes a hollow ring-shaped vaporization pipe, an inlet filter arranged so as to have a space above the fuel filler port side of the vaporization pipe, and a vaporization chamber in the vaporization pipe. In a liquid fuel combustion device comprising an outlet filter spread throughout the interior of the vaporization pipe at a fuel gas outlet side portion for supplying fuel gas to a nozzle, A liquid fuel combustion device comprising a ring-shaped upper outer shell and a lower outer shell having a letter-shaped cross section. (2) The liquid fuel combustion device according to claim 1, wherein a constricted portion for pressing the inlet filter is provided in a portion of the upper shell on the side of the fuel filler port.