JPH0116907Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to an improvement of a liquid fuel combustion device that vaporizes and burns atomized liquid fuel within a combustion cylinder.

[Technical background of the invention and its problems]

In the case of a liquid fuel combustion device, an atomization system for supplying atomized liquid fuel into the combustion cylinder is provided in a combustion cylinder having a large number of air outlet holes on the inner peripheral surface, and an atomization system is provided for supplying atomized liquid fuel into the combustion cylinder. There is one in which a combustion air introduction path communicating with the air outlet hole is formed on the top. This type of combustion device mixes atomized liquid fuel with combustion air flowing out of an air outlet in a combustion cylinder, and combusts the mixture.

In recent years, in order to make this type of combustion apparatus more compact, a method has been considered in which combustion air is supplied to the entrance of the combustion air introduction passage from a direction perpendicular to the axis of the combustion cylinder.

By the way, in a device that mixes and burns liquid fuel and combustion air, it is considered most important to mix the liquid fuel and combustion air well.

However, with the above structure in which combustion air is introduced into the combustion air introduction passage from a direction perpendicular to the axis of the combustion tube, uneven flow inevitably occurs at the entrance of the combustion air introduction passage because the air flow directions are different. Put it away. If such a drift occurs, the air amount will be unevenly distributed throughout the combustion air introduction passage formed around the combustion cylinder, and good mixing will not be obtained throughout, causing incomplete combustion. A blue flame mixed with red flame is formed. Furthermore, there is a drawback that the flame is skewed, and it is said that it is practically difficult to supply combustion air from a perpendicular direction, and there is a desire to improve this problem.

[Purpose of invention]

This idea was devised by paying attention to the above-mentioned circumstances, and its purpose is to use liquid fuel that can uniformly guide combustion air supplied from a direction perpendicular to the axis of the combustion tube to each air outlet hole. The purpose is to provide combustion equipment.

[Summary of the idea]

That is, this invention includes a bottomed cylindrical combustion tube having an end wall provided at the end of the peripheral wall inside the end of the peripheral wall, an air outlet hole provided in the peripheral wall of the combustion tube, and the above-mentioned combustion tube. A spray nozzle that is provided on the end wall side of the combustion tube and sprays liquid fuel into the combustion tube through the end wall, and a spray nozzle that is provided to surround the peripheral wall of the combustion tube and communicates with the air outlet hole. an outer shell constituting a combustion air introduction passage with an inlet on the end wall side of the combustion tube; and a bottomed wind shield tube provided on the outer surface of the end wall of the combustion tube so as to surround the tip of the spray nozzle. an extension part formed at the end of the outer shell that is on the end wall side of the combustion tube and extending the end of the outer shell beyond the peripheral wall end of the combustion tube; and an extension part provided at the end of the extension part and the wind shield. an end wall part constituting an air chamber that communicates with the combustion air introduction passage in a ring-shaped space surrounding the cylinder and the end wall of the combustion cylinder; and an end wall part connected to the end wall part in a direction perpendicular to the axis of the combustion cylinder. an air supply duct that supplies combustion air, and an air outlet that is provided in the end wall and opens on the outer peripheral side of the wind shield tube that blows out the combustion air supplied from the air supply duct into the air chamber, An air chamber is provided at the entrance of the combustion air introduction path to change the flow direction and eliminate uneven flow.

[Example of idea]

This invention will be explained below based on an embodiment shown in the drawings. The drawing shows a liquid fuel combustion device,
1 in the figure is a combustion tube. This combustion tube 1 has a peripheral wall 1
At the end of a, an end wall 1 is placed inside the end of the peripheral wall 1a.
b, and is formed into a cylindrical shape with a bottom. A through hole 2 is bored in the center of the end wall.
Immediately after the through hole 2 upstream of the combustion tube 1, there is a spray nozzle 4 connected to the liquid fuel supply pipe 4a.
are arranged, and constitute an atomization system 5 that sprays and supplies liquid fuel such as kerosene at a required spray angle toward the downstream inner peripheral surface of the combustion tube 1 through the through hole 2. Note that 6 is an ignition plug whose tip is disposed near the tip of the spray nozzle 4 and parallel to the spray nozzle 4.

On the other hand, air outlet holes 3 made up of small holes are provided along the circumferential direction in the downstream inner peripheral wall portion of the combustion tube 1 . A plurality of these air outlet holes 3 are provided along the axis of the combustion tube 1 toward the opening side, for example, in six consecutive stages, and the air outlet hole group is arranged only on the inner peripheral surface portion of the downstream side of the combustion tube 1. I try to do that. In addition, a fuel outflow prevention member 7 made of a ring-shaped plate is protruded from the inner peripheral surface of the open end side of the combustion tube 1 that continues to the frontmost part of the air outlet holes 3 . This prevents the liquid fuel from flowing out toward the opening. Furthermore, a backflow prevention plate 8, a heat receiving member 9, and a buffle plate 10 are provided in the combustion cylinder 1 from the upstream side. Here, to explain these, the backflow prevention plate 8 is constituted by a disk having an outer diameter approximately the same as the inner diameter of the combustion cylinder 1 and having a through hole 8a in the center that is large enough to allow fuel to pass through. has been done. This backflow blocking plate 8 is located at right angles to the spray nozzle 4 and is attached so as to shield the end wall of the combustion tube 1.
The spray nozzle 4 and the spark plug 6 in the latter stage can be protected from backflow generated within the combustion cylinder 1 using the barrier.

The heat receiving member 9 is constituted by a cylindrical member having an outer diameter slightly smaller than the inner diameter of the combustion tube 1 and a length corresponding to the upstream region within the combustion tube 1. The heat receiving member 9 is arranged so that its outer circumferential surface faces the inner circumferential surface on the upstream side of the combustion tube 1, and the backflow prevention plate 8 disposed at the rear stage
It is attached on the board surface of.

The baffle plate 10 is located within the row range (1st to 6th stage) of the air outlet holes 3 . . . and is arranged to cross the center of the combustion cylinder 1 . This baffle plate 10 is supported by a plurality of mounting legs (only one is shown) 10a attached to the buffle plate 10, and is disposed within the combustion tube 1.

On the other hand, an outer shell 11 is provided around the outer circumference of the combustion tube 1 so as to concentrically surround the outer peripheral surface of the combustion tube 1. Then, the inner peripheral surface of the outer shell 11 and the combustion tube 1
A combustion air introduction passage 12 is formed along the outer peripheral surface of the combustion tube 1, that is, a combustion air introduction passage 12 that communicates with the air outlet holes 3 and has an entrance on the end wall 1b side of the combustion tube 1. . In addition, the combustion air introduction passage 12
The tip of the combustion tube mirror 12 is located at the open end of the combustion tube 1.
It is blocked by b. The inlet portion 12a of the combustion air introduction passage 12 communicates with an air supply duct 21 that is connected to the base end of the outer shell 11 in a direction perpendicular to the axis of the combustion tube 1. By supplying air obtained from an air supply source such as a turbo fan from a direction perpendicular to the axis, the combustion tube 1 is
It is designed to allow combustion air to be supplied inside. Further, on the inner circumferential surface of the combustion tube 1 immediately downstream of the fuel outflow prevention member 7, a large number of air jet holes 13 communicating with the combustion air introduction passage 12 are provided along the fuel outflow prevention member 7. Introduction route 1
The air flowing through the fuel outflow prevention member 7 can also be used for cooling the fuel outflow prevention member 7. Furthermore, in the combustion air introduction passage 12, there is a connecting pipe portion 1 of a flame rod 14 for detecting the presence or absence of flame.
4a is provided, and the structure is such that the air flowing through the combustion air introduction path 12 can be used for cooling to prevent dielectric breakdown at high temperatures. On the other hand, an air chamber 15 is provided at the entrance portion 12a of the combustion air introduction path 12. This air chamber 15 connects the outer shell 11 to the combustion tube 1, for example.
An extension part 11 extending outward from the peripheral wall end of the combustion tube 1 is formed at the end of the outer shell 11 on the end wall 1b side. Further, a small wind shielding tube 16 is attached to the outer surface of the end wall of the combustion tube 1 so as to cover the through hole 2 and surround the tip of the spray nozzle 4. Further, an end wall portion 21a is provided at the end of the extension portion.
are provided, the wind shield tube 16, the end wall 1b of the combustion tube 1,
A ring-shaped space 15 having a large volume is provided around the windshield tube 16 surrounded by the outer shell 11 and the end wall portion 21a.
It forms a. Further, an air outlet 21b that opens toward the outer circumferential side of the wind shield tube 16 is provided at the center of the end wall portion 21. The air supply duct 21 is connected to this end wall portion 21a, and the supplied combustion air is blown out into the air chamber 15. A spray nozzle 4 and a spark plug 5 are fixed to the end wall of the wind shield tube 16 via a fixture 17.

In addition, 18 is a primary air hole provided in the end wall of the wind shield tube 16, and 19 is a plug cover.

Next, the operation of the liquid combustion device configured as described above will be explained.

Air is supplied from the air supply duct 21 while operating the spark plug 5. As a result, air flows out into the combustion cylinder 1 from the air outlet holes 3 through the combustion air introduction path 12. From this state, liquid fuel such as kerosene is supplied from the fuel supply pipe 4a. As a result, the liquid fuel is sprayed from the spray nozzle 4 toward the downstream inner peripheral surface of the combustion tube 1 at a required spray angle. At this time, the spark from the spark plug 5 ignites the ignition, and the combustion heat accompanying the ignition heats the inner circumferential surface of the combustion tube 1 to quickly reach a high temperature. On the other hand, the sprayed liquid fuel evaporates (vaporizes) as soon as it touches the inner circumferential surface of the combustion tube 1, which has become hot. Then, the evaporated gas is mixed with the combustion air ejected from the air outlet holes 3 and combusted, and the mixture of small particles of liquid fuel and air at the center of the spray angle is combusted, and the opening of the combustion tube 1 is combusted. A combustion flame 20 is formed at 1a. Thereafter, the liquid fuel is repeatedly heated and evaporated using the combustion flame as an ignition source to burn.

Therefore, when combustion air is supplied from a direction perpendicular to the axis of the combustion tube 1 to combust the atomized liquid fuel, the combustion air may be introduced into the combustion air introduction passage 12 with a biased flow. However, this invention can solve this problem.

That is, when the combustion air that reaches the combustion air introduction path 12 passes through the air chamber 15 provided at the inlet portion 12a, the pressure that has changed, which causes uneven flow, is equalized. Specifically, first, the combustion air blown out from the air outlet 21b is blown out toward the outer end wall 1b of the wind shield tube 16. In other words,
The combustion air hits the end wall 1b and corrects the imbalance. Then, the combustion air that has hit the end wall 1b flows toward the end wall 21a located in the opposite direction to the end wall 1b, using the collar portion of the end wall 1b as a guide. Then, the combustion air hits the end wall portion 21a, and as before, the imbalance is corrected. Then, the combustion air that has hit the end wall portion 21a enters the combustion air introduction passage 12 using the extension portion 11a as a guide.
In other words, the combustion air flows in the chamber 15 in a meandering manner, and during this time, the pressure is balanced and uneven flow is eliminated. This balanced combustion air then reaches the combustion air introduction passage 12. In this way, combustion air is introduced into the combustion air introduction passage 12 with a uniform air amount distribution. Therefore, it is possible to uniformly supply combustion air into the combustion tube 1 from each air outlet hole 3, obtain good mixing, and produce a blue combustion flame 20 resulting from complete combustion with no red flame mixed in. can be formed. Moreover, a good flame that does not shift can be obtained.

[Effect of idea]

As explained above, according to this invention, the combustion air supplied from the direction perpendicular to the axis of the combustion tube is
The combustion air flows in a meandering manner inside the air chamber, eliminating the uneven flow of combustion air. Therefore, it becomes possible to uniformly guide the air to each air outlet hole, obtain good mixing, and form a combustion flame of blue flame without red flame. Moreover, there is no way to avoid the flames.

[Brief explanation of the drawing]

The drawing is a sectional view showing a liquid fuel combustion device according to an embodiment of the invention. DESCRIPTION OF SYMBOLS 1... Combustion tube, 1a... Peripheral wall, 1b... End wall, 3... Air outlet hole, 4... Spray nozzle, 9...
...Wind shield tube, 11...Outer body, 11a...Extension part, 1
2... Combustion air introduction path, 15... Air chamber,
21...Air supply duct, 21a...End wall portion, 2
1b...Air outlet.

Claims (1)

[Scope of utility model registration request] A bottomed cylindrical combustion tube configured by providing an end wall inside the end of the peripheral wall at the end of the peripheral wall, an air outlet hole provided in the peripheral wall of the combustion tube, and an end wall side of the combustion tube. a spray nozzle that is provided to spray liquid fuel into the combustion cylinder through the end wall; and an end wall of the combustion cylinder that is provided to surround a peripheral wall of the combustion cylinder and communicates with the air outlet hole between the peripheral wall and the peripheral wall. an outer shell constituting a combustion air introduction passage with an inlet at the side; a bottomed wind shield tube provided on the outer surface of the end wall of the combustion tube so as to surround the tip of the spray nozzle; an extension part formed at the end of the combustion tube on the end wall side and extending the end of the outer shell beyond the peripheral wall end of the combustion tube; and the wind shield tube provided at the end of the extension part;
An end wall part constituting an air chamber that communicates with the combustion air introduction passage in a ring-shaped space surrounding the end wall of the combustion tube, and a combustion chamber connected to this end wall part in a direction perpendicular to the axis of the combustion tube. It is characterized by comprising: an air supply duct that supplies air; and an air outlet that is provided on the end wall and opens on the outer circumferential side of the wind shield tube that blows out the combustion air supplied from the air supply duct into the air chamber. liquid fuel combustion equipment.