JPH0214612B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a combustion tube for a burner, and can be used in grain dryers and the like.

[Prior art and problems to be solved by the invention]

In the combustion tube of the burner in the grain dryer described above, a heater for ignition is usually provided in the combustion tube where the combustion action of the fuel jetted out while gasifying is performed.

By the way, in order to ensure steady combustion, a ventilation hole is formed in the combustion tube to supply secondary air to the gasified fuel ejected from the nozzle hole of the combustion plate. This inhibits the diffusion of water into the heater section.

[Means to solve the problem]

The present invention attempts to eliminate the above-mentioned drawbacks, and is provided with a vaporizing tube 12 located within the blower tube 19 and approximately in the center thereof, which approaches the flame and gasifies the liquid fuel flowing inside.
In the combustion tube 2 which burns the gasified fuel ejected from the nozzle hole 1 of the combustion disk 9,
This combustion tube 2 has ventilation holes 7 for supplying secondary air located on the outer circumferential side of the nozzle holes 1 of the combustion disk 9 and around the entire circumference.
At the same time, the outer diameter part of this combustion tube 2 has a
The combustion cylinder of the burner is configured such that an ignition heater 5 is provided with an atomized fuel passage space through which the secondary air from the vent hole 7 does not pass.

[Operation and effect of the invention]

The atomized fuel leached from the outer periphery of the vaporization cylinder 12 is scattered around the outer periphery by the rotation of the vaporization cylinder 12,
The atomized fuel passes through the interrupted atomized fuel passage space C of the vent hole 7 and reaches the ignition heater 5, where it is ignited. Sequential carburetor 1
2 The fuel supplied to the inner periphery is the combustion flame vaporizing tube 12
It is gasified by heating and ejected from the nozzle holes 1 of the combustion disk 9 by receiving air, and continues combustion together with the supply of secondary air from the ventilation holes 7.

In this way, the secondary air flow from the vent hole 7, which should continue steady combustion, does not prevent the atomized fuel from scattering to the ignition heater 5 during ignition at the initial stage of combustion, and ignition is successful. On the other hand, after steady combustion, the ignition heater 5 is located further outside the secondary air supply vent 7 and away from the center, so overheating damage caused by combustion flames is reduced. .

〔Example〕

An embodiment of this invention will be described based on the drawings.

The combustion tube 2 includes an outer diameter portion 3 forming an outer peripheral wall, a bottom plate portion 8 forming a ventilation hole 7, and a combustion plate 9 having an injection hole 1.
It is provided at the front end of the air blower cover 11 in which the motor 10 is housed. At the center of this combustion tube 2, a vaporization tube 12 projecting forward in a mountain shape is attached to a shaft 13 rotated by the motor 10, and the outer peripheral edge 14 of the vaporization tube 12 extends toward the center of the bottom plate 9 to atomize the particles. It has a configuration that allows fuel to be leached out. Reference numeral 15 designates a nozzle for ejecting the fuel sent from the pump 16, which is located at the center of the inner circumference of the vaporizer cylinder 12 and extends toward the outer circumference of the diffuser 24 which is fixed to the shaft 13.
Reference numeral 17 denotes a blower fan for supplying combustion air, which communicates with the blower cover 11 via a pipe 18. Reference numeral 19 denotes an air blower cylinder whose front side is communicated with the dryer side, and can receive the suction action of a suction fan (not shown) to allow air to pass through the outer peripheral portion of the burner. 20 is the ventilation fan 1
7 intake port. 21 is a flame sensor, and 22 is a drain pipe.

The ventilation holes 7 of the combustion tube 2 are provided in an annular shape at narrow intervals so as to surround the outer periphery of the combustion disk 9,
Some of these spaces are formed with slightly wider intervals to form an atomized fuel passage space C in which no air wall is formed due to ventilation. An ignition heater 5 is provided on the outer periphery of the combustion tube 2 across the atomized fuel passage space C so as to approach the outer diameter line 3 of the bulging portion 4 and protrude from the front surface of the combustion tube 2. Therefore, the fuel sent from the pump 16 is injected from the tip of the nozzle 15 to the outer periphery of the diffuser 24 at the center of the vaporizer cylinder 12, but since the diffuser 24 is rotated by the motor 10, the fuel is While being atomized and diffused, it migrates along the inner circumferential surface of the vaporizing cylinder 12, which rotates at high speed, reaches the outer circumferential edge 14, and oozes out from the gap,
A part of the fuel that moves in the radial direction of the combustion tube 2 passes through the atomized fuel passage space C and is ignited by the outer ignition heater 5 to emit a flame.

Once the flame is emitted, the central vaporizing cylinder 12 is heated and gasifies the fuel passing through it. The fuel can be ejected from the nozzle holes 1 and the like into the 2 parts of the front combustion cylinder to continue combustion. The flame spreads completely within the outer diameter portion 3 of the combustion tube 2, and is sent forward by the air flowing inside the blast tube 19 on the outer periphery of the combustion tube 2.

As mentioned above, at the time of ignition, the atomized fuel passes through the atomized fuel passage space C, which is a slightly wider space between the vent holes 7, and moves to the ignition heater 5. The secondary air that is introduced easily reaches the ignition heater 5 without being affected by the introduced secondary air, but after steady combustion, the ignition heater 5 is located far from the combustion disk 9 and may be damaged by heating. There is less risk of

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 is a partially sectional side view, Fig. 2 is a rear view thereof, Fig. 3 is an enlarged side sectional view of a part thereof, and Fig. 4 is its side view. It is a partially enlarged front view. In the figure, reference numeral 1 indicates a nozzle hole, 2 indicates a combustion tube, 3 indicates an outer diameter portion, 4 indicates a bulging portion, and 5 indicates an ignition heater.

Claims (1)

[Scope of Claims] 1 Inside the blower tube 19, a vaporizer tube 12 is located approximately at the center to gasify the liquid fuel that approaches the flame and circulates inside, and is ejected from the nozzle hole 1 of the combustion disk 9. In the combustion tube 2 for burning the gasified fuel, the combustion tube 2 is provided with ventilation holes 7 for supplying secondary air around the entire circumference, located on the outer circumferential side of the nozzle holes 1 of the combustion disk 9. At the same time, an ignition heater 5 is provided on the outer diameter of the combustion tube 2, with an atomized fuel passage space C through which the secondary air from the vent hole 7 does not pass.