JPS602424Y2 - combustion device - Google Patents

Description

[Detailed description of the invention] The present invention supplies fuel from a part of the side wall of a cylindrical combustion cylinder, and blows out swirling air from the side of the middle cylinder that stands upright in the center of the combustion cylinder to cause combustion. It is an object of the present invention to provide a combustion device that effectively mixes and diffuses fuel and air to obtain an efficient combustion state.

Conventional combustion devices include those shown in FIGS. 4A and 4B.

That is, in the case shown in FIGS. 4A and 4B, a middle cylinder 2 for supplying air is installed approximately at the center of a cylindrical combustion cylinder 1.

A large number of air jet holes 3 are formed on the side surface of the middle cylinder 2 by cutting and raising a part of the middle cylinder 2, and the openings thereof have the same size and all face the same circumferential direction.

The distribution of the air ejection holes 3 is such that the upper part of the middle cylinder 2 is dense and the lower part is blocked.

In this state, the fuel supply section 4 provided at the lower part of the side wall of the combustion tube 1
When more gaseous fuel is ejected and air is supplied by the fan 5 for combustion, the swirling air ejected from the air ejection hole 3 of the middle cylinder 2 mixes with the fuel because gaseous fuel originally has a fast combustion speed. This has the disadvantage that the mixed gas burns completely before it is sufficiently diffused into the combustion tube, and combustion is completed in a portion of the combustion tube 1, making it impossible to form a flame uniformly throughout the combustion tube.

Therefore, the present invention provides a combustion device that eliminates the above-mentioned conventional drawbacks, and one embodiment thereof will be described below with reference to FIGS. 1 and 2.

In the figure, reference numeral 6 denotes a cylindrical combustion tube, and a cylindrical middle tube 7 is installed from the bottom of the combustion tube 6 approximately at the center thereof and concentrically with the combustion tube 6.

A large number of air ejection holes 8 are provided on the side surface of this middle cylinder 7.

The air ejection holes 8 are formed by cutting and raising a part of the side wall of the middle cylinder 7 so that their opening directions are all directed in the same circumferential direction.

Reference numeral 9 denotes a fan for feeding combustion air into the middle cylinder 7, and the air fed by this fan 9 is ejected into the combustion cylinder 6 from a large number of air jet holes 8, and rises as a swirling flow. .

10 is a fuel supply section provided at the lower side of the combustion tube 6;
Gaseous fuel is ejected into the combustion tube 6, or liquid fuel such as petroleum is ejected in the form of mist.

11 is an ignition device provided in front of the fuel supply section 10.

12 is a burner ring. In addition, in this embodiment, as is clear from FIGS. 1A and B and FIGS. 2A and B, the opening size of each air jet hole 8 is kept approximately constant, and the fuel supply section 10 is The density of the air jet holes 8 is made sparse in the vicinity, and the air jet holes 8 are made denser as they move away from the fuel supply part 10 in the circumferential direction of the middle cylinder 7, and the position farthest from the fuel supply part 10 is We are trying to be the most densely packed.

Therefore, a relatively small amount of the air supplied by the fan 9 is sent to the vicinity of the fuel supply section 10.
Sufficient air is sent to the position farthest from zero.

Therefore, even if gaseous fuel is ejected from the fuel supply section 10, all the fuel will not burn up near the fuel supply section 10, and some of the fuel will burn up to the farthest position from the fuel supply section 10. This is where the fuel is fed with sufficient air and starts to burn.

That is, the size of the flame can be made uniform at all positions within the combustion tube 6.

Furthermore, when the liquid fuel is sprayed in the form of a mist from the fuel supply section 10, it takes a considerable amount of time for it to evaporate even if it is in the form of a mist, and oil droplets are scattered inside the combustion tube 6 and evaporated. Since it mixes with the rear air and swirls upward in the combustion tube 6 as a uniform premixture, it is possible to produce a uniform flame.

Note that even if the atmospheric temperature in the combustion cylinder is still low immediately after ignition, the distribution of supplied air is good, so a uniform flame is produced, the rise speed is increased, and the combustion characteristics are also good.

Figures 3A and 3B show a middle cylinder in another embodiment of the present invention, in which a large number of single air injection holes 8' are arranged at equal density on the side of the middle cylinder 7' over the entire side surface. .

Note that the air jet holes 8' are formed by cutting and raising a part of the side wall of the middle cylinder 7' so that the direction of the opening is in the same circumferential direction of the middle cylinder.

The cutting and raising of the air jet hole 8' is made smaller as it gets closer to the fuel supply section 110', and becomes larger as it gets farther away.

That is, the size of the opening of the air jet hole 8' is smaller as it approaches the fuel supply section 10', and becomes larger as it goes farther away.

Therefore, also in this embodiment, the fuel supply section 10'
A relatively small amount of moderation air is ejected near the fuel supply section 10', and a sufficiently large amount of moderation air is ejected at a position far from the fuel supply section 10'.

Therefore, in this embodiment, as well as in the embodiment shown in FIG. 1, a uniform flame can be generated in the combustion cylinder regardless of the type of fuel.

As is clear from the description of the embodiments above, according to the combustion apparatus of the present invention, either liquid or gaseous fuel is supplied into the combustion cylinder by the fuel supply means provided on the side wall of the combustion cylinder having a cylindrical shape with a bottom. Even if
Since the flame is less near the fuel supply means and more at a position far from the fuel supply means, the flame becomes approximately uniform in size within the combustion cylinder, and due to complete combustion, there is little generation of soot, etc. It has the effect of increasing the rise speed and improving the combustion characteristics at that time.

[Brief explanation of the drawing]

Figures 1A and 1B show a combustion device according to an embodiment of the present invention, where A is a plan view, B is a sectional view, and Figures 2A and B are sectional views.
shows the middle cylinder used in the same combustion device, A is a plan view,
B shows a front view, FIG. 3 shows A, B shows a middle cylinder in another embodiment of the present invention, A is a plan view, B shows a front view, and FIGS. 4 A and B show a conventional combustion device. In the figure, A is a plan view and B is a sectional view. 6... Combustion tube, 7, 7'... Middle tube, 8
, 8'... Air outlet, 10, 10'...
...Fuel supply section.

Claims (5)

[Scope of utility model registration request] (1) A fuel supply means is provided on a part of the side wall of a bottomed cylindrical combustion cylinder, and a fuel supply means is provided for supplying fuel into the combustion cylinder, and the fuel supply means is provided in a part of the side wall of the combustion cylinder, and the fuel supply means is provided in the combustion cylinder from the bottom of the combustion cylinder almost concentrically with the combustion cylinder. A middle cylinder for air supply is installed upright, and a swirling air flow is ejected between the middle cylinder and the combustion cylinder on the side wall of the middle cylinder, and the amount of air supplied to the vicinity of the fuel supply means is reduced. A combustion device formed with a large number of air ejection holes. (2) The combustion according to claim 1 of the utility model registration, in which the arrangement state of the large number of air injection holes formed in the middle cylinder is such that the part near the fuel supply means is coarse and the part far from the fuel supply means is dense. Device. (3) Among the many air jet holes formed in the middle cylinder, the opening size of the air jet holes in the portion near the fuel supply means is made smaller;
The combustion device according to claim 1, which is a registered utility model, wherein the opening size of the air jet hole in a portion far from the fuel supply means is increased. (4) The combustion device according to claim 2, wherein a large number of air injection holes formed in the middle cylinder are arranged so that they become denser and coarser as they move away from the fuel supply means. (5) The combustion device according to claim 3 of the utility model registration claim, wherein the opening size of the air ejection holes formed in the middle cylinder increases from medium to large as the distance from the fuel supply means increases. .