JPH0133930Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The invention sprays liquid fuel, premixes the sprayed liquid fuel and primary air in a first chamber, and vaporizes the liquid fuel. The liquid fuel combustion device completely mixes the premixed gas in the second chamber, turns the completely mixed gas into a flame, and completely burns the flame with secondary air. This invention relates to an improvement in the structure of a plate-shaped vaporization wall having a plurality of communication ports opened around a central axis for partitioning the gas from the second chamber and guiding vaporized premixed gas to the second chamber. be.

[Conventional technology]

Conventionally, this type of liquid fuel combustion apparatus has a structure as shown in FIG.

That is, from a fuel tank (not shown) containing liquid fuel such as kerosene, the electromagnetic pump 1 supplies the liquid fuel to the pressure spray nozzle 2 located at the top. A rectifier tube 5 is arranged around the pressure spray nozzle 2 into which primary air 4 forcedly blown by the combustion blower 3 is introduced. The pressure spray nozzle 2 directs the supplied liquid fuel into the inner circumferential wall of the vaporizer cylinder main body 7 located below the vaporizer cylinder orifice 6 through the vaporizer cylinder orifice 6 having a conical tip located at the lower part of the rectifier cylinder 5. Sprays in a mist. The vaporization cylinder main body 7 is preheated by a preheater 8 embedded in a thick peripheral wall, and has a flat vaporization wall 9 at the inner bottom of the vaporization cylinder main body 7, facing the pressure spray nozzle 2. , made of aluminum alloy casting. Pressure spray nozzle 2
A vaporizing chamber 10 is formed by a portion surrounded by the vaporizing cylinder main body 7 and the vaporizing wall 9 on the side. This vaporization chamber 1
The atomized liquid fuel ejected by the pressure spray nozzle 2 into the interior of the room collides with the vaporization wall 9 and vaporizes, and is forced into the vaporization chamber 10 through the vaporization tube orifice 6 inside the rectifier tube 5. The primary air is mixed with the primary air to form a gaseous premixed gas. As will be described in detail later, a plurality of communication ports 11 are opened around the central axis of the vaporization wall 9. A mixing ring 12 faces the communication port 11 on the lower side of the vaporization wall 9, and a burner flame port 13 on the lower side is screwed into a screw hole 14 provided in a protrusion projecting downward from the center of the vaporization wall 9. Fixing screw 1
5, it is fixed to the vaporizer cylinder main body 7. A mixing chamber 16 is formed by a portion surrounded by the burner flame port 13 and the vaporizing wall 9. The vaporized premixed gas in the vaporization chamber 10 flows into the mixing chamber 16 through the communication port 11, collides with the mixing ring 12, and is completely mixed. This completely mixed gas is ejected from the burner flame port 13 into the combustion chamber 17 to form a flame.

On the other hand, an annular secondary air passage 1 formed between the carburetor main body 7 and a blower pipe 18 located on the outside thereof.
The air sent by the combustion blower 3 flows into the burner 9 as secondary air 21 through a large number of secondary air holes 20 opened at the upper end of the blower tube 18 , and flows into the outer periphery of the burner flame port 13 . The burner outlet 13 is guided by the conical secondary air guide ring 22 located therein.
The flames that were gushing out were completely burnt out.

In addition, 23 in the figure is a screw that connects the carburetor main body 7 and the carburetor orifice 6 with a heat insulating packing 24 in between.
and the rectifying cylinder 5 are integrated. A thermistor 25 is embedded in the vaporizing cylinder main body 7, and maintains the temperature of the main body 7 at an optimum vaporizing temperature. 26 is a spark plug whose tip is located at the burner nozzle 13. 27 is a water-cooled wall that contains water 28 and prevents heat conduction to the outside of the combustion chamber 17. Reference numeral 29 denotes a flange-shaped guide tube around the upper end of the carburetor main body 7 of the secondary air passage 19, which is inclined toward the outer circumference downward, and forcibly guides the secondary air 21 toward the inner circumferential wall of the blower tube 18. .

By the way, in the above-mentioned liquid fuel combustion device, the axis of the pressure spray nozzle 2 is not aligned with the central axis of the vaporization wall 9 corresponding to the position of the fixing screw 15, but is in a bent positional relationship. Or, if it was misaligned, the balance of the vaporized premixed gas ejected from the flame port would be lost, causing a side-burning phenomenon.

In addition, after the atomized liquid fuel collides with the center of the substantially circular vaporization wall 9 and is vaporized, it becomes a vaporized premixed gas and passes through the numerous communication ports 11, so that the center of the vaporization wall 9 absorbs heat of vaporization. This caused the temperature to drop and tar to adhere to the area. Then, some of the vaporized premixed gas that has passed through a large number of communication ports 11 is not completely vaporized and remains liquid fuel, which collides with the mixing ring 12 and lowers the temperature of the mixing ring 12. , tar sometimes adhered to that part as well.

Therefore, as a structure to solve these problems,
Two types of structures were adopted as shown in Figs. 4 and 5.

FIG. 4 is an exploded perspective view of the first conventional structure viewed from the burner nozzle 13 side. A mixing ring 12 and a burner flame port 13 are fixed by fixing screws 15 to a vaporizing cylinder main body 7 having a preheater 8 and a vaporizing wall 9 having a large number of communication ports 11. A punched metal or wire mesh 30 is provided on the inner peripheral surface of the burner flame port 13.

Further, FIG. 5 shows a second conventional structure, which differs from the first conventional structure in that a plurality of swivel vanes 40 are formed near the center of the mixing ring 12 in the form of a cut-and-raised shape that is inclined in the circumferential direction. It's what I did.

[Problem that the invention attempts to solve]

By the way, in the above-mentioned first conventional structure, since the thickness of the mixing ring 12 is thick, the heat capacity is large;
As mentioned above, even if the liquid fuel that has not yet vaporized collides, the temperature will not drop and no tar will adhere. However, the vaporized premixed gas could not be made uniform within the burner flame port 13, and one-sided combustion was likely to occur.

Further, in the second conventional structure, the vaporized premixed gas is uniformly stirred within the burner flame port 13 by the swirling vanes 40, so that the phenomenon of one-sided combustion is prevented. However, in order to facilitate the formation of the swirl vanes 40, the mixing ring 20 has a thin plate thickness, so when unvaporized liquid fuel collides with it, the heat capacity is small and the temperature drops, causing tar to form in that area. There was some adhesion.

This invention was made to solve the above-mentioned conventional problems, and by improving the vaporization wall,
To provide a liquid fuel combustion device capable of preventing one-sided combustion and tar adhesion to a mixing ring and a vaporizing wall even if the mounting position of a pressure spray nozzle is somewhat eccentric with respect to the central axis of the vaporizing wall.

[Means for solving problems]

According to the invention, means for spraying liquid fuel;
means for premixing and vaporizing the atomized liquid fuel and primary air in a first chamber; means for completely mixing the vaporized premixed gas in a second chamber; the first chamber and the second chamber are configured to turn the vaporized premixed gas into a flame, and means to completely burn the flame with secondary air; In a liquid fuel combustion device partitioned by a plate-shaped vaporization wall having a plurality of communication ports opened around a central axis to lead to the second chamber, a second chamber is provided on the flame side surface of the vaporization wall. There is obtained a liquid fuel combustion device characterized in that a plurality of ribs are formed from the inner wall of the chamber No. 2, passing between the communication ports and extending obliquely inward from the vaporization wall, facing in the same direction.

〔Example〕

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be explained based on embodiments with reference to the drawings, with respect to portions different from conventional ones.

Figure 1 shows a carburetor main body 50, which is the main part of the present invention.
FIG. 2 is a plan view of the burner as seen from the burner mouth side, and FIG. 2 is a perspective view thereof. The vaporization wall 51 of this embodiment has the communication ports 11 arranged in the same manner as in FIG.
A plurality of reinforcing ribs 52 are provided in between, extending obliquely from the inner wall of the vaporizing cylinder main body 50 to the center of the vaporizing wall 51.

In the above structure, the atomized liquid fuel ejected from the pressure spray nozzle 2 is mixed with the primary air forcedly blown by the combustion blower 3 in the vaporization chamber 10, and is converted into a gaseous vaporized premixed gas. Become. and,
The vaporized premixed gas impinges on the mixing ring 12 through the communication port 11 and is collected in the center. At that time, after being forcibly swirled and mixed by the ribs 52, it is fed into the burner flame port 13. Finally, the vaporized premixed gas is ejected from the burner flame port 13 into the combustion chamber 17, mixed with secondary air, and completely combusted.

According to the above flow of vaporized premixed gas, rib 5
2 forcibly swirls and mixes, the concentration is made uniform, the vaporization and mixing properties are greatly improved, and the phenomenon of one-sided flame burning at the burner nozzle 13 is greatly prevented. Furthermore, since many ribs 52 extend from the inner peripheral wall of the vaporizer cylinder main body 50 to the vaporizer wall 51 through the communication ports 11, heat transferred from the flame to the inner peripheral wall of the vaporizer cylinder main body 50 (so-called recovery Since the heat is efficiently conducted to the vaporization wall 51 through the ribs 52, the temperature of the vaporization wall 51 is prevented from decreasing, and tar adhesion is reduced. In addition, the mixing ring 12
Also, thick material can be used, so the carburetor body 1
Heat conduction from the inner circumferential wall of the mixing ring 12 is improved, a drop in temperature is prevented, and tar is prevented from adhering to the mixing ring 12.

Incidentally, since the vaporizer cylinder main body 50 can be manufactured from aluminum alloy casting, for example, aluminum die casting, the ribs can be easily formed.

[Effect of idea]

As described above, according to the present invention, since the vaporized premixed gas is swirl-mixed by the ribs, it is possible to prevent the phenomenon of one-sided combustion.

In addition, since heat is efficiently conducted to the vaporizing cylinder body by the ribs, tar is prevented from adhering to the vaporizing wall.

Furthermore, since a mixing ring with a thick inner thickness can be used, tar is also prevented from adhering to the mixing ring.

[Brief explanation of the drawing]

Figures 1 and 2 show an embodiment of the present invention, Figure 1 is a plan view, Figure 2 is a perspective view of Figure 1, and Figure 3 is a sectional view showing the overall structure of a conventional liquid fuel combustion device. ,
FIG. 4 shows a conventional example, an exploded perspective view of a vaporizing cylinder body having a vaporizing wall, a mixing ring, and a burner mouth;
FIG. 5 is a diagram similar to FIG. 4 in another conventional example. In the figure, 2 is a pressure spray nozzle, 4 is primary air, and 7 is a pressure spray nozzle.
is the vaporization cylinder body, 9 is the vaporization wall, 10 is the vaporization chamber, 11
12 is a communication port, 12 is a mixing ring, 13 is a burner flame port, 16 is a mixing chamber, 17 is a combustion chamber, 21 is a secondary chamber air, 50 is a vaporization cylinder body, 51 is a vaporization wall, and 52 is a reinforcing rib. .

Claims (1)

[Scope of utility model registration request] means for atomizing liquid fuel; means for premixing and vaporizing the atomized liquid fuel and primary air in a first chamber; and completely mixing the vaporized premixed gas in a second chamber. means for combusting the completely mixed gas into a flame, and means for completely combusting the flame with secondary air; In a liquid fuel combustion device partitioned by a plate-shaped vaporization wall having a plurality of communication ports opened around a central axis to guide the premixed gas into the second chamber, Liquid fuel combustion characterized in that a plurality of ribs are formed on the flame side surface from the inner wall of the second chamber, passing between the communication ports and diagonally inward of the vaporization wall and facing in the same direction. Device.