JPH0512582Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a fuel supply component that supplies liquid fuel and primary air to a liquid fuel combustion device having a horizontal annular passage for swirling and mixing the fuel and primary air. It is something.

[Prior Art] A liquid fuel combustion apparatus in which liquid fuel is mixed with primary air for combustion, gasified, and burned is disclosed, for example, in Japanese Utility Model Application Laid-Open Publication No. 58-189429. This type of liquid fuel combustion apparatus includes the following:
A fuel supply part is attached to the horizontal annular passage that swirls and mixes the fuel and primary air. The outer periphery of this annular passage receives heat from the combustion section and serves to vaporize the fuel discharged into the annular passage. As shown in the above publication, the conventional fuel supply part is composed of a sleeve-shaped holder whose base is formed as a mounting part and whose tip is formed in a nozzle shape, and a needle that is integrally provided in the center line direction within the holder and sprays fuel from its tip, and the tip of the needle protrudes slightly beyond the tip of the holder to ensure smooth spraying of fuel.

[Problems to be solved by the invention] In the conventional fuel supply parts described above, the tip of the needle protrudes slightly from the tip of the holder and is exposed to the annular passage, so it is easily affected by swirling airflow in the annular passage. In some cases, the flow of fuel fluctuated, leading to pulsating combustion and the generation of smoke and CO.

By the way, FIG. 5 is an enlarged cross-sectional view of the main part of a syringe needle that has a thin cylinder with an oblique cut surface at the tip, and there is a passage 6a in the center through which water and fuel pass.
A fine needle-like object such as the above-mentioned needle 6
When the cut surface 7 is provided, the liquid such as water or fuel that seeps out to the cut surface 7 side in the A direction through the passage 6a is moved to the cut surface due to surface tension as shown in the liquid 9 in FIG. When the movement of the liquid in the A direction is large, for example, when the excess medicine in the syringe is released from the syringe needle, the liquid that comes out to the cut surface not only spreads due to surface tension, but also the force of the release. The fifth
It is known that the liquid 10 in the figure is discharged in the direction B, which is the cutting direction of the cutting surface 7.

This invention solves the above-mentioned conventional problems by effectively utilizing the phenomenon shown in Figure 5, and can widen the range of stable combustion that is less susceptible to the effects of swirling airflow in the annular passage. The purpose is to obtain fuel supply parts for liquid fuel combustion devices.

[Means for Solving the Problems] The fuel supply component of the liquid fuel combustion device according to this invention includes a sleeve-shaped holder whose base is formed as a mounting portion and whose tip is formed into a nozzle shape, and a sleeve-shaped holder in which the tip is formed into a nozzle shape. It consists of a needle that is integrally installed in the direction of the center line, cut diagonally, and injects fuel from the tip that is housed in the holder, above the horizontal annular passage that swirls and mixes the fuel and primary air. The needle is mounted such that the oblique cut surface of the tip of the needle faces downward in the annular passage.

[Function] In this invention, the holder is provided above the annular passage and the cut surface of the tip of the needle is mounted facing downward with respect to the annular passage, so that the fuel released along the cut surface of the needle The outer peripheral wall surface of the annular passage, which is the vaporization surface, is placed in the direction of release of the fuel, which promotes the vaporization of the fuel released from the cut surface of the needle, and ensures that the vaporized fuel flows into the annular passage. The swirling flow created by the swirling flow mixes air and complete combustion, and since the tip of the needle does not protrude from the tip of the holder, fluctuations on the annular passage side are large enough to cause unstable combustion. The range of stable combustion can be widened.

[Embodiment] FIG. 1, FIG. 2, and FIG. 3 all show fuel supply parts of a liquid fuel combustion apparatus as an embodiment of the present invention. The structure of the combustion device main body 1 of the liquid fuel combustion device is as disclosed in Japanese Utility Model Application Publication No. 189429/1989, which has a horizontal annular passage 2 for swirling and mixing fuel and primary air, and a combustion section is provided at the tip side of the annular passage 2. It is no different from what is shown in the official bulletin. The fuel supply component 3 is a component that injects fuel and primary air into the annular passage 2 at the upper part of the base side of the annular passage 2, and is a sleeve whose base is formed as a mounting part 4 and whose tip is formed into a nozzle shape. It consists of a shaped holder 5 and a needle 6 that is integrally provided in the direction of the center line inside the holder 5 and spouts fuel from its tip. Since this needle 6 has a cut surface 7 at its tip, surface tension acts on this needle 6 in the same way as shown in FIG. 5, and a similar phenomenon of liquid fuel release along the cut surface appears. . And the holder 5 is connected to the annular passage 2 as shown in FIG.
The cut surface 7 at the tip of the needle 6 faces downward with respect to the horizontal annular passage 2 that swirls and mixes the fuel in the combustion device main body 1 and the primary air when the needle 6 is attached to the combustion device main body 1. and is configured obliquely so as not to protrude from the tip of the holder 5. Therefore, needle 6
Since the cut surface 7 faces downward, the fuel coming out on the cut surface 7 is blown upward along the cut surface 7 and is sprayed against the outer peripheral wall surface of the annular passage 2, promoting vaporization of the fuel. The holder 5 has an air intake hole 8 formed on the base side, which takes in primary air for combustion from an air passage configured outside the annular passage 2 of the combustion device main body 1, and a nozzle-shaped opening at the tip. The annular channel 2 can be fed from the end.

The needle 6 is attached to the holder 5 as shown in FIG.
The needle 6 is provided parallel to the center line of the holder 5 at a position eccentric to the lower left of the drawing with respect to the open end of the holder 5, and the positional relationship of the cutting surface 7 at its tip to the tip of the holder 5 is such that, assuming the outer diameter of the needle 6 to be d, the cutting surface 7 is set back by a dimension from O to d. In other words, the tip of the needle 6 does not protrude from the holder 5.

Thus, the fuel supply component 3 is attached to the combustion apparatus main body 1 as shown in FIG. 3, and is used for supplying fuel and primary air. The diagonally cut cutting surface 7 of the needle 6 is set back from the tip of the holder 5 by a dimension from 0 to d, and is directed downward. Therefore, it is susceptible to the effects of swirling airflow in the annular passage 2, and the fuel is blown out smoothly, but fluctuations on the annular passage 2 side do not act so greatly as to cause unstable combustion, and the range of stable combustion is wide. (See the solid line range in Figure 4). In other words, fluctuations in fuel blowout, resulting in pulsating combustion, and the generation of smoke and CO are reduced. Note that the dotted line range in FIG. 4 shows the conventional example.

[Effects of the invention] As is clear from the above description of the embodiments, the fuel supply component of the liquid fuel combustion device of the invention is a sleeve-shaped holder whose base is formed as a mounting part and whose tip is formed into a nozzle shape. and a needle that is integrally provided in the direction of the center line within this holder and injects fuel from its tip, and the holder is provided above the annular passage and the cut surface of the tip of the needle faces downward with respect to the annular passage. Since it is installed,
The outer circumferential wall surface of the annular passage, which is a vaporization surface, is arranged in the direction in which fuel is released along the cut surface of the needle, thereby promoting the vaporization of the fuel released from the cut surface of the needle, and ensuring that The fuel after naturalization is formed in the annular passage, where it is agitated by the swirling flow and mixed with air, resulting in complete combustion.Furthermore, since the tip of the needle does not protrude from the tip of the holder, the fuel on the annular passage side The range of stable combustion can be widened without the fluctuation being so large as to cause unstable combustion.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a fuel supply component showing an embodiment of the present invention, Fig. 2 is a right side view of Fig. 1, Fig. 3 is an explanatory view showing its installation state, and Fig. 4 is a combustion state. FIG. 5 is an enlarged sectional view of a main part showing how liquid is discharged from a fine needle. In the figure, 1 is a combustion device main body, 2 is an annular passage, 3 is a fuel supply component, 4 is a mounting portion, 5 is a holder, 6 is a needle, and 7 is a cut surface. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims for Utility Model Registration] (1) A sleeve-shaped holder whose base is formed as a mounting part, an air intake port is opened on the base side, and a nozzle-shaped tip, and a center line inside this holder. The needle is integrally installed in the direction of the holder and injects fuel from an obliquely cut tip located inside the tip side of the holder, and the holder is above a horizontal annular passage that swirls and mixes the fuel and primary air. 1. A fuel supply component for a liquid fuel combustion device, characterized in that the needle is installed such that the oblique cut surface of the tip of the needle faces downward in the annular passage. (2) Utility model registration claim No. (1) characterized in that the tip of the needle is set back from the tip of the holder by a dimension within the outer diameter of the needle from 0.
Fuel supply parts for the liquid fuel combustion device described in .