JPS6119291Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a liquid fuel combustion device such as a gun-type burner.

(Prior Art) As shown in FIG. 3, a conventional liquid fuel combustion device includes a spray nozzle A, a burner tube B that surrounds the nozzle A and guides combustion air from a blower, and is installed in front of the nozzle A. It consists of a flame holding plate C that mixes the combustion air with the oil sprayed by the nozzle A. However, in this conventional example, the flame anchoring surface is formed only on the front surface of the flame holding plate C, and since the secondary air to the flame is supplied from outside of the flame holding plate C, the secondary air is not sufficiently supplied to the flame. It wasn't done. Therefore, in order to shorten the flame, the diameter of the flame-holding plate C must be increased, and accordingly, the burner tube must also have a large diameter in order to secure the secondary air supply path. In addition, a large-capacity blower is required, and the combustion equipment becomes larger.

Moreover, in order to solve this conventional problem, as shown in FIG.
It has been proposed that an inner cylinder D is provided inside the burner tube B, an inner cylinder D is provided at the tip of the burner tube B, and secondary air is supplied to the flame through a gap E between the inner cylinder D and the tip of the burner tube B. However, in such conventional examples,
The supply of secondary air is carried out in a direction perpendicular to the axial direction of the burner tube B, and since the pressure and air volume of the secondary air are lower than that of the primary air sent inside the inner tube D, the secondary air is Since the fuel was flowed in the axial direction of the burner tube B, it was not sufficiently supplied to the flame, and as a result, shortening of the flame could not be expected.

(Means for Solving the Problems) In order to solve the problems of the conventional example, the present invention provides a tube with openings at both ends, which is placed concentrically with the burner and has an air outlet at its tip, with a gap between the burner tube and the burner tube. A spray nozzle and a flame holding plate are provided inside the cylinder, and the opening at the tip of the burna tube has an opening in the center with a larger diameter than the flame holding plate, with the center facing into the cylinder. In addition to installing an inclined air cone, a resistance plate is provided inside the tube with a gap between the tube and the cylinder, and the resistance plate closes the center part and connects the air outlet facing the gap between the tube and the cylinder on the outer periphery. The configuration includes the following.

(Operation) Air from the blower is sent to the front of the burner tube through the air port of the resistance plate, and is divided into primary air within the cylinder and secondary air between the burner tube and the cylinder, which has a higher pressure than the primary air. The primary air becomes the primary air of the flame formed in front of the flame stabilizing plate, and the secondary air flows out from the air outlet at the tip of the cylinder and is guided by the air cone tilted toward the center of the cylinder, causing the flame to ignite. It is supplied from the direction opposite to the direction in which it extends.

(Embodiment) Reference numeral 1 denotes a burner tube to which combustion air is sent from a blower (not shown). Inside the tube 1, a cylindrical body 3 with openings at both ends is disposed concentrically with a gap 2 between the tube 1 and the tube 1. Inside the cylinder 3 is a liquid fuel spray nozzle 4.
A flame-holding plate 8 is provided in front of the nozzle 4 and has an opening 6 in the center and a swirling blade 7 cut and raised around the periphery. Reference numeral 9 denotes an air cone attached to the opening at the tip of the burner tube 1. The air cone 9 closes the gap 2 between the tube 1 and the cylindrical body 3, and the air cone 9 has an opening in the center with a larger diameter than the flame stabilizing plate 8. 10 is provided, and the center portion is inclined toward the inside of the cylinder 3, and a certain gap a is provided between the opening 10 and the flame stabilizing plate 8. An air outlet 12 facing the inclined surface 11 of the cylindrical body 3 is formed at the tip of the cylindrical body 3 by cutting the end portion or the like.
A resistance plate 14 is attached to the upstream side of the tube 1 with a gap 13 between it and the cylindrical body 3. This resistance plate 1
4 closes the center and includes tube 1 and cylinder 3 around the outside.
An air port 15 is provided facing the gap between the two.

In the above configuration, the combustion air sent from the blower into the burner tube 1 passes through the air port 15 provided in the resistance plate 14, flows through the tube 1, and is divided into the cylindrical body 3, and some of the air flows into the gap 2. The remaining air is supplied to the flame holding plate 8 and its surroundings. The combustion air supplied to the flame-holding plate 8 mixes with oil droplets sprayed from the nozzle 4 in front of the flame-holding plate 8, and this mixture is ignited by the spark of the igniter 5 and combusts. The air that enters the air outlet 1 at the tip.
2 and is supplied to the flame as secondary air.

By the way, according to the present invention, the resistance plate 14 closes the center part and has the air port 15 facing the gap 2 between the cylinder 3 and the tube 1 on the outer periphery, so that the air pressure P2 flowing in the gap 2 is greater than the pressure P2. Moreover, since the outlet 12 of the secondary air flowing through the gap 2 faces the inclined part 11 of the air cone 9, the secondary air flowing out from the outlet 12 into the cylinder 3 is flame-stabilized as shown in FIG. Since the flame extending from the plate 8 is directed from the opposite direction, the secondary air from the air outlet 12 is directed toward the flame holding plate 8.
The fuel is supplied to the air-fuel mixture flowing in front of the air-fuel mixture and is agitated and mixed with the air-fuel mixture, so the flame is suppressed and becomes a short flame, ensuring good combustion.

(Effects of the invention) Therefore, according to the invention, in order to shorten the flame and improve combustibility, a large-diameter flame-holding plate is used, the burner tube is made large in diameter, and There is no need to increase the size of the blower, and an extremely compact combustion device can be provided.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a liquid fuel combustion apparatus according to the present invention, FIG. 2 is a cross-sectional view of the main parts, and FIG. 3 is a longitudinal cross-sectional view of a conventional example. FIG. 4 is a longitudinal sectional view showing another conventional example. 1... burn tube, 2... gap, 3... cylinder, 4... spray nozzle, 8... flame holding plate, 9... air cone, 10... opening, 12... air outlet,
13...Gap, 14...Resistance plate, 15...Air port.

Claims (1)

[Scope of utility model registration request] Inside the burner tube to which combustion air is supplied from the blower, a cylindrical body with openings at both ends and an air outlet at the tip is disposed concentrically spaced apart from the burner tube, and liquid fuel is stored inside the burner tube. A spray nozzle and a flame-holding plate are attached in front of the nozzle, and the tip opening of the burner tube has an opening in the center with a larger diameter than the flame-holding plate, and an air cone with the center inclined toward the inside of the cylinder. At the same time, a resistance plate is provided inside the tube with a gap between the tube and the cylinder, and the resistance plate closes the center and has an air port facing the gap between the tube and the cylinder at the outer periphery. Fuel combustion equipment.