JPS60140008A - Atomization nozzle device - Google Patents

Abstract

PURPOSE:To make always a stable performance of producing fine particles by a method wherein a second air feeding pipe is arranged to be movable in an axial direction and to have a desired space in respect to the extremity end of the first air feeding pipe. CONSTITUTION:In a chamber 4 for producing fine particles arranged at the extremity end of a first air feeding pipe 3, fuel from the fuel feeding pipe 5 is struck, agitated and made uniformly as fine particles by air in the first air feeding pipe 3, they are injected inwardly in a radial direction at the extremity end of the first air feeding pipe 3 and further injected outwardly from the clearance 7 formed between the extremity end of the first air feeding pipe 3 and the second air feeding pipe 6 through the air passed through the first air feeding pipe 3, and the clearance 7 is adjusted properly in response to a variation of air flow for producing fine particles. With this arrangement, it is possible to keep always a specified flow rate of air passing through the clearance and further to make a stable fine particl producing characteristic.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a spray nozzle device for spraying and burning liquids such as heavy oil and kerosene.

[Prior art]

Among conventional spray nozzle devices, for example, liquid is blown off with gas to atomize it.

The structure of a so-called two-fluid spray nozzle device is as follows.

The structure shown in FIG. 1 is known. That is, in the one shown in FIG. 1, the tip 1b of the oil outlet 1a of the nozzle part 1 is formed into a lat-9 shape, and the kernel oil outlet 1
A swirling hole 1d is bored in the side wall 1C of the oil outlet 1a, and air is introduced through the hole 1d to generate a swirling airflow A inside the oil outlet portion 1a. With such a configuration, the oil sent from the oil inlet pipe (not shown) is scattered from the tip 1b of the kernel oil outlet 1a while swirling along the inner wall surface of the oil outlet 1a. With respect to this oil droplet, an air flow is sent through the outside of the oil outlet part 1a from the hole 1f of the cylindrical outer wall 1θ located around the oil outlet part 1a of the nozzle part 1. By colliding with B, the oil droplets are atomized.

However, in the above configuration, the interval of the gap 2 formed between the outer wall of the tip 1b of the oil outlet portion 1a and the inner wall surface 1g of the tip of the cylindrical outer wall 1e is adjustable. is adjusted in conjunction with the combustion air.1 For example, when you want to change the spray amount, the flow rate ratio (ratio of spray air to spray liquid) will not be constant, and the atomization performance of the liquid will depend on the spray amount. As the amount of fuel decreases, there is a problem in that if the amount of spray is small, short flame combustion occurs and the aperture ratio cannot be increased.

[Purpose of the invention]

The purpose of the present invention was made in view of the above-mentioned problems,
An object of the present invention is to provide a spray nozzle device that can always obtain stable atomization performance.

[Structure of the invention]

In order to achieve such an object, the present invention has been made.

A first air introduction pipe and a first air introduction pipe arranged movably in the axial direction inside the first air introduction pipe and with a predetermined gap provided between the tip of the first air introduction pipe. 2 air introduction pipes, and at the tip of the first air introduction pipe, the fuel from the fuel introduction pipe is atomized with a part of the air sent from the first air introduction pipe. , has an atomization chamber for injecting the atomized fuel radially inward at the tip end position of the first air introduction pipe, and the gap is filled by moving the second air introduction pipe in the axial direction. It is configured to be variable.

The present invention will be described in detail below using an example shown in FIG.

[Embodiments of the invention]

FIG. 2 is a sectional view of essential parts showing an embodiment of the spray nozzle device according to the present invention. In the figure, reference numeral 3 denotes a cylindrical first air introduction pipe through which air for fuel atomization is sent, and an annular shape is formed at the tip of the first air introduction pipe 6. A primary atomization chamber 4 is provided. On the outer peripheral wall of this secondary atomization chamber 4, a fuel introduction pipe, in this embodiment, an oil introduction pipe 5, is provided outside the first air introduction pipe B.
An oil spout 4a through which oil is sent is formed on the inner circumferential wall of the secondary atomization chamber 4.

An air introduction port 4b is formed into which a part of the atomization air that has passed through the first air introduction pipe 3 is sent.

Further, the tip wall 4C of the -order atomization chamber 4 has a structure that is bent inward toward the second air introduction pipe 6 side, and the inner circumferential end surface of the tip wall 4C (in other words, the tip The inner wall surface 4d) is inclined so as to widen outward.

Therefore, the rear end side of the inner wall surface 4d of the tip end has a structure formed at an acute angle. Furthermore, the second
The air introduction pipes 6 are arranged inside the first air introduction pipe 3 so that their axes coincide with each other, and the outer circumferential surface 6a near the tip thereof is an inclined surface that spreads out in a circular shape. It has a shape. And the outer circumferential surface 6a of the rattan 4 shape and the -
A predetermined gap 7 is formed between the tip wall 4C of the secondary atomization chamber 4 and the tip inner wall surface 4d. As a result, the air that has passed through the first air introduction pipe 6 passes through this gap 7, becomes a high-speed airflow, and is ejected to the outside of the first air introduction pipe 3. Here, the gap 7 can be changed by moving the position of the second air introduction pipe 6 in the axial direction (in the direction of the arrow AB). That is, by moving the second air introduction pipe 6 in the direction of arrow A, the interval between the gaps 70 can be reduced, and by moving it in the direction of arrow B, the interval between the gaps 7 can be increased. By changing the interval between the gaps 7 in this way, it becomes possible to respond to changes in the amount of air for fuel atomization, and thereby the flow rate of the air passing through the gaps 7 can always be kept constant. In other words, if the amount of air for atomization is small, the interval between the gaps 7 can be adjusted to be small, and if the amount of air for atomization is large, the interval between the gaps 70 can be adjusted to be large. Regardless of the amount of air used for conversion, the flow velocity of the air ejected through the gap 7 can always be kept constant,
This makes it possible to obtain stable atomization performance.

Next, the operation of the spray nozzle device configured as described above will be explained. First, the oil that has been led to the outside position of the primary atomization chamber 4 through the oil introduction pipe 5 is
The oil is ejected into the primary atomizer 4 through an oil ejection port 4a provided on the outer peripheral wall of the oil.

On the other hand, air for atomization passes through the first air introduction pipe 3,
A part of the air is introduced into the primary atomization chamber 4 through an air introduction port 4b provided on the inner circumferential wall of the primary atomization chamber 4. At this time, the air passing through the air inlet 4b collides with the oil ejected from the oil ejection port 4a to atomize it. Although it is not clear in the figure, the air inlet 4b is formed so as to cause a strong swirling flow to the air that has entered the primary atomization chamber 4 through the air inlet 4b. The oil jetted out from the oil spout 4a due to the swirling flow has a uniform particle size. Then, the atomized oil collides with the surface of the tip wall 4C located on the tip side of the primary atomization chamber 4, and forms a uniform liquid film on the surface of the tip wall 4C. Then, the liquid film is formed on the tip wall 4C.
At the position of the inner circumferential end of the air, the particles are blown away and atomized by the high-speed airflow supplied through the first air introduction pipe 6. Note that the high-speed airflow at this time is the second
This can be adjusted by moving the air introduction pipe 6 in the directions of arrows A and B, thereby changing the interval dimension of the gap 70.

Incidentally, it is known that the atomization performance of the spray nozzle device according to the present principle is closely related to the air velocity passing through the gap 7. That is, the lower the speed of air passing through the gap 7, the lower the atomization performance. Therefore, if the amount of spray decreases and you want to reduce the amount of air for atomization accordingly, move the second air introduction pipe 6 to the direction indicated by the arrow A.
By moving in the direction, the gap 70 dimension is reduced,
Furthermore, when the amount of spray increases, the size of the gap 70 can be adjusted to be larger by moving the second air introduction pipe 6 in the direction of arrow B, thereby keeping the air velocity passing through the gap 7 constant. Can be done. As a result, even if the spray amount changes, good atomization performance can always be maintained by adjusting the position of the second air introduction pipe 6.Furthermore, depending on the structure of this embodiment, it is possible to maintain good atomization performance. Since it is possible to supply the combustion air that has passed through the second air introduction pipe 6 from the center, short flame and high load combustion are possible, and the flame can still be adjusted freely. This effect is achieved.

For example, as shown by the dotted line in FIG.
If the structure is such that a swirling vane 8 is installed on the inner periphery of the tip, the shape of the flame can be arbitrarily adjusted by adjusting the angle of the swirling vane 8.

FIG. 6 shows another embodiment of the spray nozzle device according to the present invention. This embodiment differs from the above-described first embodiment in that an inner cylinder 1° is disposed inside the first air introduction pipe 6 so that its axis coincides with the inner cylinder 10, and the inner cylinder 10 is positioned at its tip. It is formed so that it becomes hollow from a position halfway toward the end, and the hollow portion 10a constitutes a second air introduction pipe. A part of the air sent through the first air introduction pipe 6 from the air introduction port 10b provided on the outer peripheral wall of the hollow portion 10a is sent into the hollow portion 10a. There is. Further, a rod 11 is disposed within the hollow portion 10a, and the rod 1
A threaded portion 11a is screwed onto the tip of the adjusting member 1 for adjusting the air wave angle.
2 is attached movably in the axial direction of the inner cylinder 10.

That is, when the adjustment member 12 is moved toward the inner cylinder 10 side, the hollow portion i
Since the spreading angle of the air after passing through the OA and colliding with the adjustment member 12 can be made larger, flame holding performance can be improved by the circulating flow generated behind the adjustment member 12. Further, in this embodiment as well, the inner cylinder 10 disposed inside the first air introduction pipe 6 is moved in the axial direction of the first air introduction pipe 3 (arrow A
-B direction) by moving the inner cylinder 10 in the arrow A and B directions.

The interval of the gap 7 formed between the truncated conical member 13 provided on the open end side of the hollow portion 10a and the inner wall surface 4d of the tip end of the primary atomization chamber 4 can be varied.

Therefore, it goes without saying that even with the configuration of this embodiment, the same effects as those of the first embodiment described above can be achieved.

FIG. 4 shows still another embodiment of the spray nozzle device according to the present invention. In this embodiment, the oil introduction pipe 5 for supplying oil into the -order atomization chamber 4 is connected to the first air introduction pipe 3.
At the same time, the tip of the second air introduction pipe 6 arranged inside the first air introduction pipe 3 is formed into a so-called trumpet shape, and the trumpet-shaped part 6b and the above-mentioned -order fine particles are formed. A gap 7 is formed between the distal end portion of the conversion chamber 4 and the inner wall surface 4d. Further, the second air introduction pipe 6 is connected to the first air introduction pipe 6.
It is possible to move the second air introduction pipe 6 in the axial direction (in the direction of arrow A-B), so that the second air introduction pipe 6 can be moved in the direction of arrow A.
, the gap 7 can be changed by moving it in the directions B. Furthermore, a rod 14 is disposed inside the second air introduction tube B so that its axis coincides with that of the second air introduction tube B, and a damper member is attached to the tip of the rod 14 via a nut 15. 16 is fixed. The damper member 16 is configured to be able to adjust the spreading angle and flow velocity of the air that has passed through the second air introduction pipe 6. Note that the other configurations of this embodiment are the same as those of the first embodiment described above.

Even with such a configuration, it goes without saying that effects similar to those of the first embodiment described above can be achieved.

〔Effect of the invention〕

As explained above, according to the spray nozzle device according to the present invention, the fuel from the fuel introduction pipe is used with the air of the first air introduction pipe in the atomization chamber provided at the tip of the first air introduction pipe. Collision stirring is performed to uniformly atomize the particles, which are ejected inward in the radial direction at the tip of the first air introduction pipe.
In the structure, the air that has passed through the air introduction tube is blown outward from a gap formed between the tip of the first air introduction tube and the second air introduction tube.

Since the gap is configured to be able to be adjusted to an appropriate interval according to changes in the air flow for atomization, the flow velocity of the air passing through the gap can always be kept constant,
This provides the excellent effect of always being able to obtain stable atomization performance. Also, according to the device of the present invention.

Since it is now possible to supply air for combustion from the center of the sprayed fuel, short flame, high load combustion is possible, and the flame adjustment range can be widened. This also prevents the generation of soot due to complete combustion and reduces the amount of 0.
It is also effective as an energy-saving measure by adjusting the flame shape to an appropriate flame shape in consideration of chemical combustion and heat transfer.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view showing an embodiment of a conventional spray nozzle device, FIG. 2 is a sectional view of essential parts showing an embodiment of the spray nozzle device according to the present invention, and FIGS. 6 and 4 are FIG. 7 is a cross-sectional view of a main part showing other embodiments of the spray nozzle device according to the present invention. 3...First air introduction pipe, 4...-Nth atomization chamber, 4d...Inner wall surface of the tip. 5... Oil introduction pipe, 6... Second air introduction pipe. 7...Gap, 10...Inner cylinder. ioa...Hollow part. Figure 1

Claims (1)

[Claims] A first air introduction pipe and a first air introduction pipe arranged movably in the axial direction inside the first air introduction pipe and having a predetermined gap between the first air introduction pipe and the distal end of the first air introduction pipe. and a second air introduction pipe, and at the tip of the first air introduction pipe, the fuel from the fuel introduction pipe is atomized with a part of the air sent from the first air introduction pipe. , has an atomization chamber for injecting the atomized fuel radially inward at the tip end position of the first air introduction pipe, and the gap is filled by moving the second air introduction pipe in the axial direction. A spray nozzle device characterized in that it is configured to be variable.