JPS6158723B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to varying the amount of fuel in a burner using a pressurized spray and pressurized injection fuel supply system.

Currently, gun-type burners that use a pressurized spray type have the advantage of easy combustion control and a short time from ignition to steady combustion, but on the other hand, with a single nozzle, the amount of fuel cannot be varied, and there is a limit to the lower limit of the nozzle diameter.
The drawback was that it was not possible to cause slight combustion.

In other words, the fuel spray amount of a gun type burner is determined by the following formula: Q=K・π/X・√2・〓p/a・d ² (K: constant, g: gravitational acceleration, a: specific gravity of fuel , d: Nozzle hole diameter) When a single nozzle is used, it is determined by the fuel supply pressure P to the nozzle. Therefore, it is possible to control the discharge amount from the nozzle by changing the fuel supply pressure P, but since the discharge amount is proportional to P〓, the method of changing the pressure requires a large pressure change. shall be. However, in gun-type burners, there are limits to both the upper and lower limits of the fuel supply pressure to the nozzle, and the width cannot be increased. Therefore, it is not possible to perform variable control of the fuel amount over a wide range by changing the supply pressure.

In addition, the minimum spray amount of the nozzle used in gun-type burners is limited to approximately 1.5/h, and nozzles with a smaller spray amount have a very small hole diameter, so they may be susceptible to fine dust, etc. At present, this method is not put into practical use because it is prone to accidents such as hole clogging.

The present invention has been made in view of the above problem, and one of its objects is to change the air flow rate without changing the fuel supply pressure to the nozzle even with a single nozzle. The amount of atomized fuel discharged can be variably controlled, and the amount of fuel can be adjusted over a wide range, which was previously impossible. The second purpose is to atomize fuel using a nozzle with a large hole diameter without reducing the hole diameter of the nozzle to a diameter that is easily clogged by fine dust, etc., and take out a part of the atomized fuel and burn it. In particular, it is an object of the present invention to provide a liquid fuel combustion device in which nozzle clogging due to fine dust or the like can be eliminated and excess atomized fuel that does not pass through the discharge port of an atomization chamber can be recovered without waste.

An embodiment of the present invention will be described below with reference to the drawings.

First, in FIG. 1, a fuel injection nozzle 1 linearly injects liquid fuel pressurized and sent from a liquid fuel pressurizing device such as a gear pump 2 through an oil feed pipe 3 to an atomization chamber 4. The atomized particle group 6 is formed by colliding with a wall 5 provided inside the atomized particle group. The atomization chamber 4 has a cylindrical shape, and a narrow opening 7 is provided at the tip thereof so that the atomized particle group 6' is sucked and discharged by the ejector effect caused by the air flow passing around the outer periphery of the atomization chamber 4. There is. Further, an outside air inlet 8 is provided at the farthest point of the opening 7, and is further covered with a lid 9 to which the nozzle 1 is attached. A cylinder 10 is fixed to the air inlet 8 portion, and a movable damper is attached to the cylinder 10 to change the opening area of the cylinder 10 in order to adjust the amount of outside air 11 flowing into the atomization chamber 4. 12 are provided.

Reference numeral 13 denotes an outer cylinder that is fixed concentrically to the atomization chamber 4 and forms a passage 16 for the air 15 sent out from the blower 14 together with the atomization chamber 4 . The outer cylinder 13 has an opening 17 on the tip side that is narrowed and has a diameter larger than the diameter of the opening 7 of the atomization chamber 4, and the opening 17 allows air 15 sent out from the blower 14 and the atomized particle group to flow through the opening 17. The discharge port is 6'. A donut-shaped flame-holding plate 19 with a plurality of air circulation holes 18 is inserted between the atomization chamber 4 and the tip of the outer cylinder 13, and the inner diameter of the flame-holding plate 19 is the same as that of the atomization chamber 4 and the outer cylinder 13. The diameter is larger than the opening 7 of the chamber 4, and the outer diameter is smaller than the opening 17 of the outer cylinder 13. A portion of the air 15 and the rest of the air 15 are allowed to flow outside the outer diameter. A conduit 22 in which surplus fuel 20 is collected and returns the surplus fuel 20 to the fuel tank 21 is fixed to the lowest part of the atomization chamber 4 .

23 is an oil strainer, and 24 is an air filter.

Next, the operation of the burner of the above configuration will be explained.

First, when this burner is put into operation by operating a switch or the like, the blower 14 is driven and the blown air 1
5 passes through the air passage 16 and reaches the tip of the burner,
It separates into a space 25 formed by the narrow part of the atomization chamber 4 and the flame-holding plate 19, and a gap 26 between the tip of the outer cylinder 13 and the outer periphery of the flame-holding plate 19, and then flows out. On the other hand, the pump 2 sucks the liquid fuel in the fuel tank 21 through the oil feed pipe 3 and the oil strainer 23, and pumps it to the nozzle 1. The liquid fuel that has reached this nozzle 1 is injected in a straight line from the tip of the nozzle 1 toward a wall 5 provided in the atomization chamber 4, and is atomized by colliding with the wall 5. The particles become particles 6 and scatter into the atomization chamber 4. At this time, since the nozzle 1 has a large hole diameter and can inject a large amount of fuel relative to the amount of fuel, the number of atomized particle groups 6 also increases.

Next, when the movable damper 12 of the cylinder 10 fixed to the lid 9 of the atomization chamber 4 is opened, depending on its opening degree,
Due to the ejector effect of the air 15 sent out from the blower 14 and flowing out of the space 25, the inside of the atomization chamber 4 becomes negative pressure, and the air flows from the opening of the movable damper 12 of the cylinder 10 through the outside air inlet 8 and into the atomization chamber. 4 outside air 1 inside
1 is introduced, and the atomized particle group 6 is caused by the air flow.
A part of the flame is discharged from the opening 7 and further passed through the flame stabilizing plate 19 by the air 15 to the burner head side 28.
is pumped to. The atomized particle group 6 is ignited by bringing an ignition source (not shown) here, and the atomized particle group 6 is ignited by the air flowing out from the plurality of air circulation holes 18 formed in the flame holding plate 19. ' is sucked in, mixed and burned, thereby forming a combustion flame 27 from the surface of the flame-holding plate 19, which is further mixed with air flowing out from the gap 26 between the outer cylinder 13 and the flame-holding plate 19. Continue good combustion without generation of fuel.

If the opening area is changed by the movable damper 12 in the cylinder 10, the amount of outside air 11 flowing into the atomization chamber 4 is increased or decreased, and the atomized particle group 6' sucked and discharged from the opening 7 is accordingly increased. The amount of fuel can be controlled by increasing or decreasing the amount of fuel. Further, the atomized particle group 6 remaining in the atomization chamber 4 hits the peripheral wall of the atomization chamber 4 or falls due to gravity, and in either case, it collects in the oil reservoir 28 at the bottom of the atomization chamber 4 and returns. Fuel tank 2 through oil conduit 22
Return to 1. Further, the air filter 24 is provided to prevent the fuel in the atomization chamber 4 from being contaminated by fine dust and the like flowing in together with the outside air 11.

FIG. 2 is a cross-sectional view of a burner showing another embodiment of the present invention, showing the case where the wall 5 is removed. For other relevant parts, the numbers given in FIG. 1 above are used, and explanations are omitted. do.

In this way, the liquid fuel combustion device of the present invention can reduce the hole diameter of the nozzle by sucking and ejecting a part of the fuel particles atomized in the atomization chamber by the ejector effect of the air flow. This enables fine combustion without reducing the diameter to such a size that it is easily clogged by fine dust, and also enables wide control of the amount of fuel by adjusting the amount of outside air flowing into the atomization chamber. The amount of outside air inflow can be adjusted by changing the area of the inlet opening, by changing the amount of air blown by the blower, or by using a combination of both.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a burner according to one embodiment of the present invention, and FIG. 2 is a cross-sectional view of a burner according to another embodiment of the present invention, in which 1 is a spray nozzle, 2 is a fuel pressurizing device, 4 is an atomization chamber, 5 is a wall, 6 is a group of atomized particles, 7 is a narrowed opening, 8 is an outside air inlet, 10
is a cylinder, 12 is a damper, 13 is a wind cylinder (outer cylinder),
14 is a blower, and 28 is a burner head side.

Claims (1)

[Claims] 1. A spray nozzle or an atomizing device that atomizes liquid fuel injected linearly from the nozzle by hitting a wall, and the liquid atomized by the atomizing device The atomization chamber has an atomization chamber that contains fuel particles and has a narrowed opening for discharging the fuel particles to the burner head side by an air flow and an air inlet in the vicinity of the nozzle. A wind cylinder is provided to cover the area and use the space as an air passage, and a blower is provided to blow air into the wind cylinder. A liquid fuel combustion device characterized by a constricted space. 2. The liquid fuel according to claim 1, wherein the amount of atomized fuel sucked and discharged from the atomization chamber is controlled by changing the opening area of the air inlet of the atomization chamber. Combustion device. 3. The liquid fuel combustion device according to claim 1 or 2, wherein the blower is a blower that can change the amount of air blown.