JPS6138769B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to reducing noise during combustion in a gun type burner.

Conventionally, this type of gun type burner has a flame holding plate 31 for the nozzle 8 provided in the blower tube 5 as shown in FIG. A circular hole 32 through which the injected spray passes, and an air hole 33 for supplying combustion air to the outer periphery of the flame stabilizing plate 31 are provided to create a negative pressure area on the flame stabilizing plate 31 to form flame stabilization. In order to prevent soot from adhering to the flame-holding part and to improve combustion performance, a cut-and-raised part 34 was provided. However, the conventional gun-type burner configured in this manner has the disadvantage that the negative pressure area generated on the flame holding plate 31 becomes turbulent, and turbulent flame is generated during combustion, resulting in extremely loud noise. . Furthermore, the particle size of the spray particles injected from the nozzle 8 varies from several microns to 200 microns, and this variation in particle size causes a change in the combustion reaction rate, leading to an increase in the density change of the combustion gas and a large combustion noise. It was becoming the cause.

In addition, in order to completely burn the fuel with large particle size, it was necessary to have a negative pressure area on the flame stabilizing plate 31 where a strong turbulent flow was created.

The present invention eliminates the drawbacks of the conventional gun type burner, and one embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

In FIG. 1, reference numeral 1 denotes a burner base, and the burner base 1 is provided with a fan case 3 in which a fan 2 is installed, and a motor 4 for driving the fan 2 is attached to the fan case 3. 5 is a blower tube installed on the burner base 1, and this blower tube 5
A flame stabilizer 7 having a substantially conical shape and having a plurality of steps 6 is provided inside. Reference numeral 8 denotes a nozzle whose end is inserted from the small-diameter portion of the flame stabilizer 7 to inject fuel, and is held by a nozzle adapter 9 . 10 is an ignition electrode used as an example of an ignition means for igniting the fuel injected from the nozzle 8; 11 is a small hole provided in a single row or in multiple rows in the stepped portion 6 of the flame stabilizer 7; The combustion air is configured to be supplied substantially perpendicularly to the extension line of the shaft. Reference numeral 12 denotes a small hole provided in the small diameter tapered portion 13 of the flame stabilizer 7, which is formed coarser and with the same pitch as the small hole 11 provided in the stepped portion 6, and is designed to prevent extreme pressure inside the flame stabilizer 7. Combustion air is supplied into the flame stabilizer 7 from this small hole 12 so that no difference occurs, and it is configured to intersect at right angles on the extension line of the central axis of the nozzle 8. One end of the small diameter tapered portion 13 is connected to the stepped portion 6 of the flame stabilizer 7, and the other end faces the outer periphery of the nozzle 8. Reference numeral 14 denotes a rectifying plate located upstream of the small hole 12 provided in the small diameter tapered portion 13 of the flame stabilizer 7 and provided between the blower tube 5 and the flame stabilizer 7;
2, the combustion air is uniformly supplied to the nozzles 1 and 12, and the combustion air intersects at right angles on the extension of the central axis of the nozzle 8. 1
Reference numeral 5 designates a cover of a hole 16 provided in the fan case 3 that is substantially coaxial with the nozzle 8, through which the nozzle adapter 9 and the lead wire 17 of the ignition electrode 10 pass.

In the gun type burner of this embodiment configured as described above, the fuel is injected in a mist form from the fuel nozzle 8 sent from the oil pump (not shown), and the ignition electrode 10 is connected to the ignition transformer (not shown). When the fuel is ignited, the fan 2 rotates, and combustion air passes through the ventilation path formed between the fan case 3 and the burner base 1, passes through the blower tube 5, and then exits from the small holes 11 and 12 of the flame stabilizer 7. It is supplied to the flame stabilizer 7 and combustion continues.

A small hole 12 provided in the small diameter tapered portion 13 of this flame stabilizer 7 and a small hole 1 provided in the negative pressure portion of the stepped portion 6.
1 is formed with strong flame holding according to the amount of air supplied so as not to interfere with each other, and the atomized fuel injected from the nozzle 8 is preheated by the flame holding of the small holes 11 and 12, and a combustion reaction occurs. is accelerated and burns as particulate fuel, so the change in combustion reaction rate becomes extremely small.

Furthermore, since most of the combustion air is supplied into the flame stabilizer 7 through the small holes 11 provided in the stepped portion 6, the flame holding formed in the small holes 12 in the small diameter tapered portion 13 is disturbed. Since it is possible to maintain stable flame stability without any disturbance, stable combustion performance can be obtained even if the amount of combustion air or oil varies slightly. In addition, small holes 11 and 12 provided in the small diameter tapered part 13 and the step part 6 of the flame stabilizer 7
The combustion air supplied into the flame stabilizer 7 from the nozzle 8 is supplied substantially perpendicularly to the extension of the central axis of the nozzle 8, so that it is uniformly mixed with the atomized fuel and flows in the circumferential direction of the flame stabilizer 7. Since the flow is laminar, the flame formed outside the small holes 11 does not become turbulent, and therefore the noise during combustion is extremely low. Further, the small diameter tapered portion 13 has one end connected to the stepped portion 6 and the other end facing the outer periphery of the nozzle 8, and a plurality of small holes 12 are provided in the small diameter tapered portion 13 near the nozzle 8. Therefore, no turbulent flow is generated inside the small diameter tapered part 13, including the vicinity of the nozzle 8, and flame holding is performed only in the small hole 12, and combustion noise is generated in the small diameter tapered part 13. No extra flames are formed that would connect.

In addition, the atomized fuel injected from the nozzle 8 is preheated by flame stabilization formed in the small holes 11 and 12 of the flame stabilizer 7, and each particle size becomes small and uniform, so that the combustion reaction rate and combustion gas are reduced. Changes in density are also reduced, and noise during combustion can be further suppressed.

As described above, a plurality of small holes having a substantially conical shape and having a plurality of steps and supplying combustion air from the steps;
A small diameter tapered part with one end connected to the stepped part and the other end facing the outer periphery of the nozzle, and a plurality of small holes provided in the vicinity of the nozzle of this small diameter tapered part to supply combustion air. The gun-type burner of the present invention is constructed by providing a rectifying plate between the flame holder and the blower tube located upstream of the small hole in the small diameter taper part of the flame holder, and the gun type burner of the present invention In this case, the flame is stabilized only in the small hole provided in the small diameter taper part, and there is no extra flame that may lead to combustion noise in the small diameter taper part, and the mist sprayed from the nozzle is The fuel is preheated by the above-mentioned flame stabilization process and becomes particulate fuel, and the fuel flows in a laminar flow state to the small holes provided in the stepped portion of the flame stabilizer. Combustion air is supplied into the flame stabilizer through the small hole provided in this stepped part, and is supplied at a substantially right angle to the extension of the central axis of the nozzle, so that the fuel and combustion air are evenly mixed. At the same time, it is further preheated by the flame stabilization formed in the small holes in the stepped portion, resulting in complete combustion. Therefore, even if there is some variation in the particles of fuel injected from the nozzle, there is little change in the combustion reaction rate or change in the density of the combustion gas, so a turbulent flame does not occur, resulting in a gun-type burner with extremely low noise during combustion.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the main parts of a gun type burner showing an embodiment of the present invention, Fig. 2 is a perspective view showing the rectifying plate shown in Fig. 1, and Fig. 3 is a conventional one corresponding to Fig. FIG. 4 is a front view showing the flame holding plate of the gun type burner shown in FIG. 3, and FIG. 5 is a perspective view of the flame holding plate shown in FIG. 4. . 5...Blower cylinder, 6...Stepped section, 7...Flame stabilizer, 8
... Nozzle, 10 ... Ignition electrode, 11, 12 ...
Small hole, 13... small diameter taper part, 14... rectifier plate.

Claims (1)

[Claims] 1. A blower tube, a flame stabilizer provided in the blower tube and having a substantially conical shape and having one or more steps on the circumference, and a nozzle inserted from the small diameter part of the flame stabilizer to inject fuel. an ignition means for igniting the fuel injected from the nozzle; a plurality of small holes provided in the step of the flame holder; one end connected to the step of the flame holder and the other end connected to the nozzle; a small diameter tapered part facing the outer periphery of the flame holder, a plurality of small holes provided near the nozzle of the small diameter tapered part, and a plurality of small holes provided in the small diameter tapered part of the flame stabilizer on the upstream side. 1. A gun-type burner comprising: a rectifier plate located between the blower tube and the flame stabilizer;