JPS6242247Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention provides a combustion device that increases the recirculation of the generated flue gas by swirling combustion air and obtains good combustion characteristics.

Conventional configuration and problems thereof Conventionally, in this type of combustion device, as shown in FIG.
All of them were installed so that air was blown out tangentially and directly to the side of the outer circumference of the middle cylinder.

In this configuration, once the size of the combustion chamber 3 and the flow rate of air from the air nozzle 2 are determined, the swirling flow generated within the combustion chamber 3 causes recirculation of the combustion exhaust gas generated above the middle cylinder 1. The amount was approximately fixed and it was not possible to increase the recirculation amount enough to improve the combustion characteristics.

Purpose of the invention The present invention is intended to solve the problems of the conventional technology, and to increase the amount of recirculation and improve the combustion characteristics sufficiently under the same combustion chamber size and air flow velocity from the air nozzle. With the goal.

Structure of the Invention In order to achieve the above object, the present invention includes a means for supplying fuel to the combustion chamber, and a middle cylinder provided in the central part of the combustion chamber and having a large number of air injection holes in the side wall. The air jet hole provided in the upper part of the cylinder has its opening tangentially to the middle cylinder and facing downward.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings.

In FIG. 1, 1 is a nozzle as an atomizing means, and oil sent from an oil tank is sprayed from the tip of the nozzle 1 by an electromagnetic pump 2.

Reference numeral 3 denotes a middle cylinder provided in the center of the combustion chamber 4, and a large number of air injection holes 5 are provided in the side wall of the middle cylinder. 6 is a blower motor, 7 is a blower fan, and combustion air sent from the blower fan 7 passes through a blower guide 8 and is ejected from the air outlet 5 of the middle cylinder 3.

9 is a cylindrical auxiliary combustion cylinder arranged around the middle cylinder 3 so as not to contact the wall of the combustion chamber 4, and provided with an opening 10 to prevent particles ejected from the nozzle 1 from colliding with each other; It is erected so as to form a vaporization and mixing chamber with the middle cylinder 3. 11 is a ring that controls the flow of combustion exhaust gas in the combustion chamber 4.

In the above configuration, oil sent from the electromagnetic pump 2 is atomized by the nozzle 1 and sent into the auxiliary combustion cylinder 9. Combustion air is ejected from the air ejection holes 5 of the middle cylinder 3, and is ignited by the ignition device to perform combustion.

The air jet holes 5 of the middle cylinder 3 facing the auxiliary combustion cylinder 9 act for vaporization and mixing, and the air jet holes provided in the upper part of the middle cylinder 3 that do not face the auxiliary combustion cylinder 9 act for combustion. . Further, the air jet holes 5 are configured to jet air in a tangential direction to the outer circumference of the middle cylinder 3, so that a swirling flow is formed in the combustion chamber 4. The swirling flow creates a forced vortex at the center of the combustion chamber 4, so that the pressure at the center of the combustion chamber 4 is more negative than the pressure above the ring 11. Therefore, when the combustion exhaust gas flows outside the ring 11, a recirculation phenomenon occurs in which a part of the exhaust gas flows into the combustion chamber 4 again. In the present invention, the opening of the air jet hole 5 provided at the upper part of the middle cylinder 3 is formed in the tangential direction of the middle cylinder 3 and downward, so the air jetted from the air jet hole 5 is directed downward. The pressure in the center of the combustion chamber 4 becomes even lower, increasing the amount of recirculation.

Effects of the invention As described above, according to the invention, the amount of recirculation can be increased under the same conditions as the size of the combustion chamber and the air flow rate from the air nozzle.

When the amount of recirculation increases, unused gas in the combustion exhaust gas is re-burned, resulting in clean exhaust gas, which improves combustion characteristics.

[Brief explanation of the drawing]

FIG. 1 is a front sectional view of a combustion device showing an embodiment of the present invention, and FIG. 2 is a sectional view of a conventional example. 1... Nozzle, 2... Electromagnetic pump, 3... Middle cylinder, 4... Combustion chamber, 5... Air jet hole.

Claims (1)

[Scope of utility model registration request] It is equipped with means for supplying fuel to the combustion chamber, and a middle cylinder provided in the central part of the combustion chamber and having a large number of air injection holes on the side wall, and the air injection holes provided in the upper part of the middle cylinder have an opening. A combustion device formed tangentially to the middle cylinder and facing downward.