JPS6138768B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to reducing the noise of a gun-type burner.

Conventionally, in order to ensure combustion performance, gun type burners have a flame holding plate 7 in front of the nozzle 2 installed inside the blower tube 6 as shown in Fig. Generally, flame stabilization was achieved by creating a negative pressure area on the flame stabilizing plate by providing circular holes 8 and air holes 9 around the outer periphery so that the spray could pass through. In order to prevent soot from adhering to the flame-holding portion of the flame-holding plate and to improve combustion performance, a raised cut 10 is usually formed. Note that 15 is an ignition electrode. In such a conventional example, the negative pressure region generated on the flame stabilizing plate 7 is in a turbulent state and generates a turbulent flame, resulting in extremely loud combustion noise. In addition, the particle size of the spray particles from the nozzle 2 ranges from a few microns to as large as 200 microns or more, and this non-uniformity causes non-uniformity in the combustion reaction rate.
This increases combustion noise by increasing the density change of the combustion gas, and this is a major reason why gun-type burners are generally said to have high combustion noise. Furthermore, in order to completely burn the large particles, it is necessary to form a negative pressure region with strong turbulence on the flame stabilizing plate 7, as described above.

The present invention improves upon these conventional drawbacks, and one embodiment thereof will be described below with reference to the drawings.

In FIG. 1, a fan case 13 having a fan 12 provided therein is attached to a burner base 11, and a motor 14 for driving the fan 12 is attached to this fan case 13. A blower tube 1 is attached to the burner base 11 on the side opposite to the fan case 13, a nozzle 2 is provided inside the blower tube, and a conical flame stabilizer 5 is provided between the blower tube and the nozzle.
is provided. 15 is the ignition electrode, 16 is the nozzle 2
A fixing nozzle adapter 17 is a cover for a hole 18 made in a part of the fan case 13 substantially coaxially with the nozzle, and a lead wire 19 from the nozzle adapter 16 and the ignition electrode 15 is passed through it. .
The flame stabilizer 5 has a large number of small holes 4 arranged in one or more rows at close intervals in the conical tip part furthest from the nozzle, and the small diameter part on the nozzle side allows the opening part 3 to be placed near the nozzle to prevent the flame from flowing. The flame stabilizer 5 is provided with a size that allows a sufficient amount of air to pass through so that the flame holder 5 does not return, that is, so as not to create an extremely uneven pressure area inside the flame stabilizer 5. Further, between the blow tube 1 and the flame stabilizer 5, the air is uniformly blown in the circumferential direction of the flame stabilizer 5,
In addition, a secondary rectifying plate 20 is provided so that the air flow blown out from the small hole 4 of the flame stabilizer 5 is rectified so as to be directed toward the nozzle center axis. Note that a perspective view of the secondary current plate 20 is shown in FIG. Further, the nozzle-side open part 3 of the flame stabilizer 5 is provided with a valve located on the outer periphery of the nozzle 2 so that the air flow passing from the open part 3 does not become a swirling flow but becomes a flow parallel to the center axis of the nozzle. A primary rectifying plate 21 is provided to rectify the current. A perspective view of the primary rectifying plate 21 is shown in FIG.

In the above configuration, oil sent from an oil pump (not shown) is sprayed from the nozzle 2, ignited by an ignition electrode 15 connected to an ignition transformer (not shown), and then sent from the blower fan 12. Combustion is continued by air that passes between the fan case 13 and the burner base 11, passes through the blower tube 1, and is blown out from the small holes 4 of the flame stabilizer 5. At this time, the flame holder 5
The amount of air coming out of the opening 3 may be an amount that prevents the flame from returning to the vicinity of the nozzle, and may be about 10 to 20% of the total amount of air.

The air flow blown out from the small holes 4 of the flame stabilizer 5 is uniform in the circumferential direction and directed toward the center axis of the nozzle, so that it is almost perpendicular to the flow direction of the fuel sprayed from the nozzle, so mixing is very good. This improves combustion performance. In addition, since the position where the flame is formed is the small hole 4 which is far from the nozzle, the oil particles sprayed from the nozzle receive the heat of the flame and become atomized as a whole by the time they reach the part where the flame is formed. By preheating, the particle size of each particle of the spray becomes small and uniform throughout, which equalizes the combustion reaction rate of each particle, reduces the density change of combustion gas, and reduces combustion noise. make it lower. Furthermore, as mentioned above, the air flow blown out from the opening 3 is made parallel to the nozzle center axis by the primary rectifying plate 21, so that it does not disturb the flame, and the flame stabilizer 5
Since the shape is conical, the air is not disturbed between the open part 3 and the small hole 4 of the flame stabilizer 5, and therefore no flame is formed in this part. Furthermore, as described above, the air flow blown out from the small holes 4 is directed toward the nozzle center axis by the secondary baffle plate 20 and becomes a uniform laminar flow in the circumferential direction, so the flame formed is also a laminar flow. The combustion noise is only generated from the laminar flame and is extremely low.

As described above, the present invention can reduce combustion noise by preheating the spray by receiving the heat of the flame and by forming a laminar flame.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a burner in an embodiment of the present invention, Fig. 2 is a perspective view of a secondary rectifying plate used in the present invention, and Fig. 3 is a primary rectifying plate used in the present invention and its vicinity. FIG. 4 is a cross-sectional view of a conventional burner. 1... Blower tube, 2... Nozzle, 3... Opening part,
4...Small hole, 5...Flame holder, 11...Burner base, 12...Fan, 13...Fan case,
14... Motor, 15... Ignition electrode, 16... Nozzle adapter, 19... Lead wire, 20... Secondary rectifier plate, 21... Primary rectifier plate.

Claims (1)

[Claims] 1 In a gun type burner with a nozzle 2 provided in a blower tube 1, between the blower tube and the nozzle, the small diameter part on the nozzle side is an open part 3, and the tip part away from the nozzle has a single row at small intervals. Alternatively, a conical flame holder 5 having a large number of small holes 4 arranged in multiple rows is provided, and air is blown into the flame holder 5 from the small holes 4 between the blower tube 1 and the flame holder 5. A secondary baffle plate 20 that makes the flow uniform in the circumferential direction and directs it in the direction of the nozzle center axis is further provided in the nozzle side opening 3, so that the air flow passing through this opening 3 is made to flow parallel to the nozzle center axis. This gun type burner is characterized in that it is provided with a primary rectifier plate 21 that allows the