JPS618509A - Flame form adjusting mechanism of burner nozzle - Google Patents

Abstract

PURPOSE:To obtain a flame form adjusting mechanism of a burner nozzle which can retain the flame form in optimum condition by the variation of the size of an air flow out opening which is provided at the axis of a tip blow out opening of the burner nozzle by a turning operation thereof. CONSTITUTION:An air flow passage is provided at the axis of the blow out opening 11 of the tip of this burner nozzle, that is at the inside of an oil nozzle. A shaft 18 is projected to the outside of the tip opening of an air flow passage 13, and a circular collision plate 19 to which the air passed through the air flow passage 13 wound collide is provided. The clearance between the outer periphery or the circular collision plate 19 and the tip opening of the air flow passage 13 is formed as a ring shaped air blow out opening 20. An atomized fuel oil is sprayed from the blow out opening 11. In this case, the size of the clearance of the air flown out opening 20 is varied by the screwy displacement of a connection section 16 with an air supply pipe 15 being revolved, a dispersion of an air being blown out from the blow out opening 20 is changed, the flame is lengthen or shorten from its inside and an optimum flame shape is obtained according to a load.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a flame shape adjustment mechanism for a burner nozzle that atomizes and burns fuel oil using an atomizing medium such as air or steam.

[Background of the invention]

First, the prior art will be explained based on FIG. Air is fed as an atomizing medium into the burner nozzle 2 through the inflow pipe 1, and a part of this fed atomizing medium flows into the hole 3.
The fuel oil that passes through the air nozzle 4 and exits from the fuel outlet 5 of the oil nozzle 4 is supplied as a swirling flow so as to adhere to the inner surface 7 of the air nozzle 6. The remaining atomized medium passes through the hole 8 and is blown out through the ring-shaped tip injection port 11 formed as a gap between the tip of the main body 9 of the burner nozzle 2 and the shielding plate 1o. Reference numeral 12 indicates a fuel oil inflow pipe, and the inflow pipe 12 communicates with the inside of the air nozzle 6 via the fuel jet port 5 . Furthermore, an air jet port (not shown) is provided around the burner nozzle 2 for supplying combustion air to be mixed with the atomized combustion oil. The fuel oil that has flowed through the inflow pipe 12 then flows out into the air nozzle 2 from the fuel jet port 5, but this fuel oil is rotated by a part of the atomized medium that flows into the xy-/through 2 from the hole 3. At the same time as it hits the shielding plate 10, it is blown off by the atomizing medium jetted outward from the tip opening surface of the burner nozzle 2, and is atomized into atomized particles by the ring-shaped tip injection port 11 and is injected. If you ignite it, it will become a flame.

However, in the above-described conventional burner nozzle, the area of the tip injection port 110 is not variable, so if the size of the gap between the injection port J1 is set to provide an optimal flame shape when the burner is under high load, the flame shape will not be as large when the burner is under low load. becomes shorter and heating efficiency decreases. Conversely, if the size of the gap is set so as to provide an optimal flame shape when the burner is under low load, the flame becomes too long when the burner is under high load, and the heating efficiency also decreases.

[Purpose of the invention] The present invention was developed in view of the above circumstances, and is a burner that can maintain an optimal flame shape regardless of the burner load condition, thereby improving heating efficiency. The purpose is to provide a nozzle flame shape adjustment mechanism.

[Summary of the idea]

The feature of the present invention is that an air flow path is provided at the axial position of the tip injection port of the burner nozzle, and a connecting part with the air supply pipe is screwed on the base end side of the air flow path so that it can be moved in the axial direction. A shaft is formed to extend from the connecting portion to the outside of the opening surface at the tip of the air flow path, and a circular abutting portion against which air hits is provided at the tip of the shaft, and the circular abutting portion and the air flow By forming a gap with the opening surface at the tip of the channel as an air injection port, the air supply pipe is rotated to move the connecting portion in a spiral manner, thereby changing the size of the gap between the air injection port at the tip. The advantage is that the spread of the air injected from the air injection port is changed to make the flame longer or shorter depending on the load condition of the burner, thereby maintaining an optimal flame shape.

[Example of idea]

-Hereinafter, the present invention will be explained in detail based on the embodiments shown in the drawings. FIG. 1 shows a sectional view of a burner nozzle according to the present invention. An air flow path 13 is provided at the axial center of the injection port 11 at the tip, that is, within the oil nozzle 4 . The air flow path 13
is formed as a cylindrical cavity, and has a female thread 14 on the proximal end.
is engraved.

A connecting portion 16 with the air supply pipe 15 is provided at the female thread 14.
are screwed together. That is, a male thread 17 is formed on the outer circumferential surface of the connecting portion 16, and the connecting portion 16 is configured to be able to move in the axial direction by rotating the air supply pipe 15. A shaft 18 is formed to extend forward from the connecting portion 16. The tip of the shaft 18 protrudes outward from the opening surface of the tip of the air flow path 13, and the tip is provided with a circular impact portion 19 against which the air passing through the air flow path 13 hits. ing. An air injection port 20 is formed in the shape of a gap between the outer periphery of the circular abutting portion 19 and the opening surface at the tip of the air flow path 13 .

21 indicates a communicating hole. Further, 22 indicates a spacer, and the spacer 22 is for holding the shaft 18 on the axial center line, and has a through hole 23 formed therein. The rest of the configuration is similar to that of the conventional example, so the same parts are given the same reference numerals and the explanation will be omitted.

Next, the effect will be explained. As described above, fuel oil atomized by the atomite medium is injected forward from the injection port 11 at the tip. This point is similar to the conventional example. The air supply pipe 15 is rotated to spirally move the connecting portion 16 to change the size of the gap between the air injection ports 20.
By changing the spread of air injected from zero, the flame is made longer or shorter from inside the flame. That is, when the burner is under high load, the size of the gap between the air injection ports 20 is reduced to increase the spread of the air injected from the air injection ports 20, thereby shortening the flame and tilting the optimal flame shape. Conversely, when the burner is under low load, the size of the gap is increased to reduce the spread of the injected air, thereby making the flame longer and giving it an optimal flame shape.

[Effect of idea]

According to the present invention, an air injection port is provided at the axial center position of the tip injection port of the burner nozzle, and the size of the air injection port is changed by rotating the air supply pipe, so that the amount of air injected from the air injection port is changed. By changing the spread, the flame shape can be made longer or shorter depending on the burner load condition, so the flame shape can be maintained in the optimal state regardless of the burner load condition. can. Therefore, heating efficiency can be improved.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a burner nozzle according to the present invention, and FIG. 2 is a sectional view of a conventional burner nozzle. 2... Burner nozzle, 11... Tip injection port. 13... Air flow path, 15... Air supply pipe. 16...Connection part, 1B...Shaft, 19...
- Circular impact part, 20... air injection port.

Claims (1)

[Claims] In a burner nozzle that sprays atomized fuel from a ring-shaped injection port at the tip of the nozzle, an air flow path is provided at the axial position of the injection port, and the base end of the air flow path is connected to an air supply pipe. a circular abutting part in which the shaft is screwed together so as to be able to move in the axial direction, and a shaft is formed to extend from the connecting part to the outside of the opening surface at the tip of the air flow path, and air hits the tip of the shaft; A flame shape adjustment mechanism for a burner nozzle, characterized in that the gap between the circular abutting portion and the opening surface at the tip of the air flow path is formed as an air injection port.