JPH0335944Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a gun-type burner for vaporizing and burning oil such as kerosene.

[Technical background of the invention and its problems]

Conventional gun-type burners of this type have a configuration as shown in FIG. 2, in which oil is jetted out from a nozzle to atomize it, and the atomized oil is ignited and combusted. That is, in Fig. 2, 2' is a cylindrical combustion cylinder with a bottom, and a large number of secondary air outlet holes 1 are bored in the side peripheral wall thereof, and primary air and fuel supply holes 14 are formed upwardly in the bottom part. It is provided with a protrusion. 15 is the combustion tube 2'
The outer cylinder surrounds and holds the combustion cylinder 2', and forms an air chamber 16 between it and the combustion cylinder 2'. Reference numeral 5' denotes a capped cylindrical inner cylinder disposed above the supply cylinder 14 of the combustion cylinder, which has a larger diameter than the supply hole 14, and has a lower end with a gap between it and the bottom of the combustion cylinder 2'. A mixing chamber 17 is formed in the chamber. Reference numeral 11 denotes an oil feeding means, and a nozzle tip 10 at the tip thereof is disposed near the supply hole 14 facing upward into the inner cylinder. Reference numeral 13 denotes ignition means provided close to the nozzle tip opening. Reference numeral 18 denotes a blowing fan, and its wind tunnel 19 is connected to the bottom of the outer cylinder 15.

In the gun type burner for oil vaporization and combustion having such a configuration, the oil injected from the supply hole 14 is ejected at a certain ejection angle so as to be contained in the inner cylinder, and at the same time, the oil is ejected by the ignition means. By igniting the
The inner cylinder is immediately heated to a temperature high enough to vaporize the ejected oil. Therefore, the oil ejected from the nozzle immediately vaporizes in the inner cylinder, passes through the gap between the lower end of the inner cylinder and the bottom of the combustion cylinder, and undergoes primary combustion with the primary air from the supply hole. The combustion occurs in a space formed between the inner cylinders of the combustion cylinder, where combustion is performed by secondary air from an outlet provided in the combustion cylinder, and a blue flame is formed at the outlet of the space.

However, in this conventional oil vaporization combustion burner, the primary air supply hole 14 communicates directly with the combustion chamber through the gap between the lower end of the inner cylinder and the bottom of the combustion cylinder, and the ventilation resistance is extremely low. At the time of ignition, the primary air from the supply hole fluctuates depending on the combustion gas pressure, and the mixture ratio of vaporized fuel gas and air in the inner cylinder fluctuates across the flammability limit, resulting in oscillatory combustion that exhibits small explosion phenomena. The problem was that it was difficult to obtain stable initial combustion. Furthermore, while the positional relationship between the inner cylinder of the nozzle tip and the supply hole is determined by the spray angle and spray amount of the nozzle tip, the amount of primary air is determined by the ventilation resistance due to the positional relationship between the supply hole and the nozzle tip. It has been difficult to set the amount of primary air, which is an important factor, and it has been difficult to obtain good combustion.

[Purpose of invention]

The present invention was developed in view of the above circumstances, and its purpose is to prevent backfire into the inner cylinder at the time of ignition, to obtain stable initial combustion, and to improve manufacturing efficiency. It is an object of the present invention to provide a gun-type burner for oil vaporization combustion, which can easily set the amount of primary air, which is sometimes an important factor for combustibility.

[Summary of the idea]

In order to achieve the above object, the present invention includes a combustion cylinder having a large number of secondary air outflow holes, a combustion cylinder provided within the combustion cylinder, a large number of vaporized fuel outflow holes in the peripheral side wall, and a closed end at the upper end. Part A: an inner cylinder having an air circulation hole at its lower end, an outer cylinder whose upper end is connected to surround the combustion cylinder via an air chamber, and a partition plate connected to the lower end of the combustion cylinder. A bottomed cylindrical primary air control cylinder is attached to the lower side of this partition plate to surround the air circulation holes, and has an appropriate number of primary air inflow holes of the required size almost uniformly provided on the surface in the circumferential direction. and an oil feeding means that penetrates the bottom C of the primary air control cylinder and has a nozzle tip at its tip directed from the air circulation hole toward the inner cylinder closing part A, and an ignition means that has an ignition part close to the nozzle tip. and a blower means connected to the side part of the outer cylinder through a blower duct connected to the bottom of the burner, so that the cross section of the combustion chamber between the combustion cylinder and the inner cylinder gradually increases. The combustion tube is formed in a shape that widens from the lowest end toward the top, and an air flow gap is provided between the primary air control tube and the bottom of the burner.

[Example of idea]

Hereinafter, the present invention will be explained based on embodiments shown in the drawings. FIG. 1 is an explanatory diagram of an embodiment of the present invention, and reference numeral 2 in the drawing shows a combustion chamber formed in a substantially cylindrical shape, with a large number of secondary air outflow holes 1 bored in its side circumferential wall. It is a cylinder. Reference numeral 5 denotes an inner cylinder provided concentrically at intervals within the combustion cylinder, and a large number of vaporized fuel outlet holes 3 are provided in the side peripheral wall of the inner cylinder.
However, there is a blockage part A in the upper part and an air circulation hole 4 in the lower part.
Bottom plate portions each having a bottom plate portion are provided. Thus, a combustion chamber 6 is formed between the combustion cylinder and the inner cylinder. At this time, some of the secondary air outflow holes 1 in the combustion cylinder peripheral wall and the vaporized fuel outflow holes 3 in the inner cylinder peripheral wall, which are provided facing the combustion chamber, face each other, and the other outflow holes face each other. The fuel outflow hole is located at the lower part on the upstream side, and the secondary air outflow hole is located at the upper part on the downstream side.
The combustion chamber is configured to expand in a tapered shape as it goes from the lowest end to the top, and the cross section of the combustion chamber formed between the inner cylinder and the combustion cylinder gradually increases.

Reference numeral 7 denotes a partition plate that holds the inner cylinder at the end of the combustion cylinder and partitions the combustion chamber at the lower end of the combustion cylinder. It is configured to 9 surrounds the communication hole 4 on the lower side of the partition plate 7 and defines an air circulation gap 2 between it and the burner bottom 23.
The primary air control tube is a bottomed cylindrical primary air control tube which is attached with a cylindrical hole 2 provided, and an appropriate number of primary air inlet holes 8 of a required size are bored in the surface of the tube almost uniformly in the circumferential direction.

Reference numeral 11 denotes an oil supply means provided through the bottom C of the primary air control cylinder, and a nozzle tip 10 is connected to the tip thereof with a spray hole opened from the air circulation hole toward the inside of the inner cylinder. . An ignition means 13 also extends through the bottom C and is attached to the oil supply means, and its ignition portion 12 is placed close to the spray hole of the nozzle tip 10. Thus, a vaporization chamber 21 is formed inside the inner cylinder. The volume of this vaporization chamber is such that at the beginning of ignition, the vaporized fuel in the vaporization chamber is burned to heat the inner cylinder, and thereafter the atomized oil is vaporized at that heating temperature and combustion is maintained in the combustion chamber between the combustion cylinder and the inner cylinder. The combustion rate is determined to be the amount necessary to obtain the temperature required for the combustion process. Reference numeral 15 denotes an outer cylinder that surrounds and holds the combustion tube 2, and forms an air chamber 16 between it and the combustion tube 2. Reference numeral 18 denotes a blowing means, which is connected to a side portion of the outer cylinder 15 via a blowing duct 19 connected to the burner bottom portion 23 .

To explain the operation in such a configuration, when the burner is operated, first, the blowing means is operated to scavenge (pre-purge) the combustion chamber 6 and the inner cylinder vaporization chamber 21 of the burner, and the vaporization combustion outflow hole 3,
The amount of air necessary for ignition is supplied into the inner cylinder from the primary air inflow hole 8. When the set time required for pre-purge has elapsed, oil is sprayed from the nozzle tip 10 provided at the tip of the oil feeding means 11, and
The ignition device is activated. The oil sprayed into the inner cylinder 5 is partially vaporized at room temperature, and when this vaporized fuel and the air inside the inner cylinder reach the flammability limit, ignition combustion occurs within the inner cylinder by the action of the ignition means, and the inner cylinder is heated. Then, the unvaporized oil droplets in the inner cylinder and the oil sprayed after ignition begin to vaporize.

Since the air in the inner cylinder 5 is consumed during combustion during ignition, the vaporized fuel lacks air and is not combusted in the inner cylinder, but mixes with the air that has flowed in from the primary air inflow hole 8 and flows through the vaporized fuel outflow hole. and flows out into the combustion chamber 6. At this time, the outflow from the vaporization chamber 21 to the combustion chamber 6 is regulated by the vaporized fuel outflow hole 3 formed in the inner cylinder peripheral wall, so that it is evenly distributed to the combustion chamber 6, and the primary air and vaporized fuel are Mixing is facilitated. The vaporized fuel that has flowed into the combustion chamber 6 is transferred to the combustion tube 2.
It mixes with the air from the inlet of the combustion chamber and forms a blue flame at the outlet of the combustion chamber, and the inner cylinder 5 is heated by the blue flame. From then on, vaporization in the inner cylinder is actively carried out, and at the outlet of the combustion chamber, the blue flame is heated. Blue flame combustion is well maintained.

At this early stage of combustion, the vaporization chamber 21 communicates with the combustion chamber 6 through the vaporized fuel outflow hole 3.
The influence of pressure fluctuations in the combustion chamber is regulated, and the blue flame in the combustion chamber flows back into the inner cylinder, eliminating the occurrence of oscillating combustion that resembles small explosions as in conventional combustion chambers. Moreover, since the primary air inflow hole 8 communicates with the combustion chamber 6 through the vaporization combustion outflow hole 3 and the air circulation hole 4, the influence of pressure fluctuations in the combustion chamber is further regulated in the primary air inflow hole 8, and the air is always uniform. Primary air is supplied,
Good combustion conditions can be maintained in the combustion chamber during the combustion period. In addition, the required amount of primary air can be easily secured by determining the size and quantity of the primary air inflow holes 8 provided in the primary air control cylinder 9, and by the configuration in which the primary air is arranged almost uniformly in the circumferential direction, Primary air flows into the inner cylinder without drifting, and stable combustion can always be achieved. Furthermore, in terms of manufacturing, in the past, the amount of primary air fluctuated depending on the positional relationship between the nozzle tip and the inner cylinder, etc., which required precision during assembly.In contrast, with the present invention, the primary air inlet hole of the required size can be adjusted to fit the required size. Only a few holes need to be drilled, and the burner is easy to manufacture, leading to cost reduction.

Further, since the vaporized fuel outflow hole 3 is partially located opposite to the air outflow hole 4, and the rest is provided upstream from the position of the air outflow hole, the vaporized fuel that has flowed into the combustion chamber 6 gradually passes through the air outflow hole. The mixing ratio with the fuel increases, combustion progresses slowly, a good green flame is formed near the top of the inner cylinder (closed part A), and stable combustibility is achieved due to the low air ratio. Therefore, the combustion gas backflow regulating effect of the vaporized fuel outflow hole 3 and the primary air inflow hole 8 of the inner cylinder 5 together with the combustion gas pressure fluctuation in the combustion chamber causes the green flame to flow into the unburned air through the vaporized fuel outflow hole. At the same time, there is no danger that the fuel will flow back into the inner cylinder and burn (that is, reverse) in the inner cylinder, inducing oscillatory combustion. In addition, by configuring the cross section of the combustion space formed between the inner cylinder 5 and the combustion chamber 2 to be tapered so as to gradually increase outward, the amount of combustion gas that increases as combustion progresses is reduced. The cross-sectional area of the flow path can be increased in accordance with the volume, and the flow resistance can be reduced. Therefore, at the time of ignition, sparks are likely to come out from inside the inner cylinder, and backfire is less likely to occur, which is more effective in preventing vibrational combustion.

[Effect of idea]

Since the present invention is constructed as described above, it is possible to prevent the occurrence of oscillating combustion in which the blue flame in the combustion chamber flows back into the inner cylinder and has the appearance of a small explosion, and to stably supply the amount of primary air. You can always get good blue fire. In other words, by providing an air flow gap between the primary air control tube and the bottom of the burner, and in combination with the configuration of the primary air inlet holes arranged uniformly in the circumferential direction, the primary air can flow from the entire circumference of the primary air control tube. The water flows uniformly into the interior thereof, and further into the inner cylinder, without being unevenly distributed. Moreover, by providing the air blowing means on the side portions of the burner body, the structure can be made compact in the height direction. Furthermore, during manufacturing, the primary air inflow section is manufactured in a standard manner, and the nozzle tip can be easily installed without eccentricity with respect to the air circulation hole, which reduces manufacturing man-hours and costs.

Furthermore, by configuring the combustion chamber to gradually increase its cross-sectional area, combustion progresses slowly from the bottom of the combustion chamber, and a good combustion surface is formed over the entire surface of the combustion chamber outlet, resulting in stable combustibility at low air ratios. can be obtained.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of one embodiment of the present invention, and FIG. 2 is an explanatory diagram of a conventional embodiment. 1 is a secondary air outflow hole, 2, 2' is a combustion tube, 3 is a vaporized fuel outflow hole, 4 is an air circulation hole, 5, 5' is an inner cylinder, 6 is a combustion chamber, 7 is a partition plate, 8 is a primary Air inflow hole, 9 is a primary air control cylinder, 10 is a nozzle chip, 11 is an oil supply means, 12 is an ignition part, 13 is an ignition means, 14 is a supply hole, 15 is an outer cylinder, 16 is an air chamber, 17 is a mixing chamber , 18 is a ventilation means, 19 is a ventilation duct, 20 is a screw, 21 is a vaporization chamber, and 22 is an air circulation gap.

Claims (1)

[Scope of utility model registration request] a combustion tube 2 having a large number of secondary air outflow holes 1;
An inner cylinder 5 is provided in the combustion cylinder, and has a large number of vaporized fuel outflow holes 3 on the peripheral side wall, and has a closing part A at the upper end and an air circulation hole 4 at the lower end; , an outer cylinder 15 whose upper end is connected so as to surround it via an air chamber 16, and a combustion cylinder 2.
A partition plate 7 is connected to the lower end, and a suitable number of primary air inflow holes 8 of a required size are formed on the surface of the partition plate 7 almost uniformly in the circumferential direction. An oil supply system in which the nozzle tip 10 at the tip is directed from the air circulation hole 4 to the inner cylinder closed part A, passing through the bottomed cylindrical primary air control cylinder 9 and the bottom C of the primary air control cylinder. Means 1
1 and a nozzle tip 10, and an ignition means 13 having an ignition part 12 provided close to the nozzle tip 10, and an air blowing means 18 connected to the side part of the outer cylinder 15 through an air blowing duct 19 connected to the burner bottom 23. It's hot,
The combustion tube 2 is formed to widen from the lowest end toward the top so that the cross section of the combustion chamber 6 between the combustion tube 2 and the inner tube 5 gradually increases, and the primary air control tube 9 and A gun-type burner for oil vaporization combustion, characterized in that an air circulation gap 22 is provided between the burner bottom part 23 and the burner bottom part 23.