JPH10115406A - Rotary burner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the generation of soot and carbon monoxide without increasing operation noises by connecting a rotary fish tail which extends flames by the combustion of a splashed fuel of a rotary splash body toward a secondary air feeding part side, to the leading end of the rotary splash body. SOLUTION: A primary air feeding part 11 is provided on a bottom wall 12A, and at the same time, a rotary splash body 18 which splashes a liquid fuel being fed from a fuel feeding pipe 19 by a centrifugal force, is fitted on the leading end of a rotating shaft 3 which is inserted in a combustion cylinder 9 having secondary air feeding parts 15 on the peripheral wall 13B. Then, an igniting device 14 is arranged at a fuel splashing location of the rotary splash body 18, and also, to the upper end of the rotary splash body 18, a rotary fish tail 20 which extends flames by the combustion of a splashed fuel of the rotary splash body 18, toward the peripheral wall 13B of a larger diameter part 13 of the combustion cylinder 9 on which a large number of the secondary air feeding holes 15 are provided, is connected. By doing so, the generation of soot and carbon monoxide is suppressed, and the operation noise can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary burner in which liquid fuel such as kerosene supplied from a fuel supply pipe is atomized and dispersed by centrifugal force of a rotating scatterer, and the scattered fuel is ignited and burned. Things.

[0002]

2. Description of the Related Art Conventionally, a rotary burner of this type has a primary air supply section on a bottom wall and a secondary air section on a peripheral wall, as disclosed in Japanese Patent Publication No. 56-16844, for example. A rotating shaft is inserted into the combustion cylinder, and a rotating scatterer that scatters the liquid fuel supplied from the fuel supply pipe by centrifugal force is attached to the tip of the rotating shaft, and the rotating scatterer is scattered from the rotating scatterer. By igniting the finely scattered fuel with the ignition device, combustion can be started immediately after the start of the operation without requiring much ignition waiting time.

[0003]

However, in the conventional rotary burner described above, the primary air supply from the primary air supply unit and the air flow due to the secondary air supply from the secondary air supply unit cause the air to flow. , Because the combustion flame is focused on the central part in the combustion cylinder downstream of the rotating scatterer,
Mixing with secondary air was poor, and there was a problem that a large amount of soot and carbon monoxide was generated. In order to reduce the amount of soot and carbon monoxide generated, if a strong swirling airflow is generated inside the combustion cylinder to improve the mixing property between the flame and the secondary air, there is a problem that the blowing noise increases. It was a mess.

The present invention has been made in view of the above circumstances, and has as its object to provide a rotary burner capable of suppressing the generation of soot and carbon monoxide without increasing the operation noise.

[0005]

According to the first aspect of the present invention, a combustion cylinder having a primary air supply section on a bottom wall and a secondary air supply section on a peripheral wall is inserted into the combustion cylinder. A rotary scatterer attached to the tip of the rotary shaft and scatters the liquid fuel supplied from the fuel supply pipe by centrifugal force; an ignition device disposed at a fuel scatter position of the rotary scatterer; and a rotary scatterer. A rotary flame spreader that is connected to the distal end and that spreads the flame generated by the combustion of the scattered fuel from the rotary flyer toward the secondary air supply unit.

According to the second aspect of the present invention, the rotary flame expander is formed in a divergent cup shape having a tip portion having a diameter larger than that of the rotary scatterer.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In FIG. 1, reference numeral 1 denotes a motor, 2 denotes a blower fan mounted at an intermediate position of a rotating shaft 3 of the motor 1, and 4 denotes a fan case in which the blower fan 2 is provided. The motor 1 is mounted on the outer surface, and an air supply port 5 is formed at an appropriate position. An air supply pipe (not shown) is connected to the air supply port 5.

A bottomed cylindrical outer cylinder 7 is connected to the upper wall 4A of the fan case 4 via a seal member 6, and inside the outer cylinder 7, a combustion chamber having an open upper surface is provided. A tube 9 is fixedly supported concentrically with the outer tube 7 via a ring plate 8. The space between the outer cylinder 7 and the combustion cylinder 9 is separated from the blower fan 2 through a plurality of air inlets 10 and 10 provided in a central portion and an outer peripheral portion of a bottom wall 7A of the outer cylinder 7. An air storage chamber X to which combustion air is supplied is provided.

[0010] The combustion cylinder 9 is directed toward the tip of the outer cylinder 7.
It has a cylindrical shape with a bottom, which is enlarged in a stepwise manner, and a rotary shaft 3 of the motor 1 is inserted into the center of the bottom wall 12A of the small-diameter portion 12 in the lower stage, and primary air supply for sending primary air is performed. The mouth 11 is provided, and the peripheral wall 1 of the small diameter portion 12 is provided.
An ignition device 14 is provided in 2B, and a large number of secondary air supply holes 15 for supplying secondary air to the combustion chamber Y in the combustion cylinder 9 are provided in a peripheral wall 13B of the large diameter portion 13 in the upper stage. I have. Reference numeral 16 denotes an annular diaphragm plate attached to the upper surface of the step wall 17 between the small diameter portion 12 and the large diameter portion 13.

Reference numeral 18 denotes a rotary scatterer fixed to the tip of the rotary shaft 3 inserted into the small-diameter portion 12 of the combustion cylinder 9. The rotary scatterer 18 is formed in a downwardly expanding tapered cup shape. The liquid fuel such as kerosene supplied from the fuel supply pipe 19 is scattered by the centrifugal force in the form of fine particles from the swing-off portion 18A on the lower edge toward the peripheral wall 12B of the small diameter portion 12. Further, at the upper end of the rotating scatterer 18, a combustion cylinder 9 provided with a number of secondary air supply holes 15, is provided with a flame caused by the combustion of the scattered fuel of the rotating scatterer 18.
Rotating flame spreader 2 spreading toward the peripheral wall 13B of the large diameter portion 13 of FIG.
0s are connected continuously.

The rotary flame spreader 20 is formed by drawing a heat-resistant steel plate into a divergent cup shape having two upper and lower stages having a large-diameter tapered portion 20B continuously on a small-diameter tapered portion 20A. A step wall 20C between the small-diameter tapered portion 20A and the large-diameter tapered portion 20B is located at substantially the same height as the throttle plate 16, and the small-diameter tapered portion 20A is
Of the large-diameter tapered portion 20
B is located at a lower portion in the large diameter portion 13 of the combustion cylinder 9. The outer diameter of the upper end of the large-diameter tapered portion 20B is about 1.1 times the outer diameter of the swing-out portion 18A of the rotary scatterer 18.
It is set to 6 to 2 times, and is set to be larger than the diameter of the central opening 16A of the diaphragm plate 16.

The igniter 14 includes a small-diameter portion 1 of the combustion cylinder 9.
The insertion tube 14A has a tip opening slightly projecting into the small-diameter portion 12 through the second peripheral wall 12B, and a spark is generated between the insertion tube 14A and the insertion tube 14A to cause ignition. A large number of ventilation holes 21 are formed at the tip end of the insertion auxiliary cylinder 14A protruding into the small-diameter portion 12, and the ignition device 14 Is located at the fuel scattering position. Reference numeral 22 denotes a frame sensor.

In the above configuration, when the combustion operation is started, first, the motor 1 is driven to rotate the blower fan 2, the rotating scatterer 18 and the rotary flame spreader 20. Combustion air is supplied to the air storage chamber X through the ports 10 and 10, and the combustion air supplied to the air storage chamber X passes through the primary air supply port 11 as primary air in the small diameter portion 12 of the combustion cylinder 9. And blows into the combustion chamber Y as secondary air through a number of secondary air supply holes 15.

In this way, when the igniter 14 is driven almost simultaneously with driving the fuel pump (not shown) at the time when the pre-purge of about 20 seconds has been completed from a few seconds at the beginning of the combustion operation, the liquid fuel The liquid fuel is supplied from the supply pipe 19 to the inside of the rotating scattered body 18, and the supplied liquid fuel is shaken off by the centrifugal force of the scattered body 18.
A becomes the fine particles from A, and the peripheral wall 1 of the small diameter portion 12 of the combustion cylinder 9
At this time, the air scatters toward the main air inlet 2B, is mixed with the primary air from the primary air supply port 11, is ignited by the ignition device 14, and combustion is started. Here, the flame caused by the combustion of the scattered fuel passes through the space between the throttle plate 16 and the rotary flame expander 20 and extends into the large-diameter portion 13 of the combustion cylinder 9. The flame is expanded by the tapered portion 20B, and is guided to the vicinity of the peripheral wall 13 of the large-diameter portion 13 of the combustion cylinder 9 provided with a number of secondary air supply holes 15, 15.

Therefore, the flame is supplied to the secondary air supply holes 15, 1
The mixture with the secondary air ejected from 5 becomes good, and a good combustion state is achieved in which the generation of soot and carbon monoxide is greatly improved.

According to this embodiment, the primary air supply port 11 is provided on the bottom wall 12A of the small diameter portion 12, and a large number of secondary air supply holes 15, 15 are provided on the peripheral wall 13B of the large diameter portion 13. Combustion cylinder 9 and combustion cylinder 9 through primary air supply port 11
A downwardly-spreading tapered cup-shaped rotary scatterer fixed to the tip of the rotary shaft 3 of the motor 1 inserted into the small-diameter portion 12 and scatters the liquid fuel supplied from the fuel supply pipe 19 at the shake-off portion 18A by centrifugal force. 18 and this rotating scattered body 18
An ignition device 14 having an ignition plug 14B disposed at a fuel scatter position, and an upper end portion of a rotary scatterer 18;
A rotary flame spreader that spreads the flame generated by the combustion of the scattered fuel from the rotary flyer 18 toward the peripheral wall 13B of the large-diameter portion 13 of the combustion cylinder 9 provided with a number of secondary air supply holes 15,15. 18, the mixture of the flame and the secondary air ejected from the secondary air supply holes 15 and 15 becomes good, and the generation of soot and carbon monoxide can be greatly reduced. In addition, since it is not necessary to generate a strong swirling air flow in the combustion cylinder 9 in order to suppress the generation of soot and carbon monoxide, it is possible to prevent the blowing noise and the combustion noise from increasing.

[0017]

According to the present invention, a combustion cylinder having a primary air supply section on the bottom wall and a secondary air supply on the peripheral wall, and a shaft mounted on the tip of a rotary shaft inserted into the combustion cylinder. A rotary scatterer that scatters the liquid fuel supplied from the fuel supply pipe by centrifugal force, an ignition device disposed at the fuel scatter position of the rotary scatterer, and a rotary scatterer that is connected to the tip of the rotary scatterer and rotates. A rotary flame spreader that spreads the flame generated by the burning of the scattered fuel toward the secondary air portion side, so that the flame is mixed with the secondary air supplied from the secondary air supply unit. Is good, and not only can the generation of soot and carbon monoxide be suppressed, but also it is not necessary to use excessive air such as a strong swirling air flow to suppress the generation of soot and carbon monoxide.
Not only can the operating noise be reduced, but also the heat dissipation loss,
It is possible to provide a high-efficiency rotary burner that does not require a vaporization heater and has a quiet operation sound.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a rotary burner showing one embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a main part of the same.

[Explanation of symbols]

 3 Rotary shaft 9 Combustion cylinder 11 Primary air supply unit (primary air supply port) 12A Bottom wall of combustion cylinder 13B Peripheral wall of combustion cylinder 14 Ignition device 15 Secondary air supply unit (secondary air supply hole) 18 Rotary scattered body 19 Fuel Supply tube 20 rotating flame spreader

Claims (2)

[Claims] 1. A combustion cylinder having a primary air supply section on a bottom wall and a secondary air supply section on a peripheral wall, and is mounted on a tip of a rotating shaft inserted into the combustion cylinder and supplied from a fuel supply pipe. A rotating scatterer that scatters the liquid fuel to be sprayed by centrifugal force, an igniter disposed at the fuel scattering position of the rotating scatterer, and A rotary flame spreader for spreading a flame due to combustion toward the secondary air supply unit. 2. The rotary burner according to claim 1, wherein the rotary flame spreader is formed in a divergent cup shape having a tip end portion larger in diameter than the rotary scatterer.