JPS61250411A - Combustion apparatus - Google Patents

Abstract

PURPOSE:To decrease a lifting combustion and to enlarge the width of combustion so that a good burning state can be attained, by disposing burner ports on the circumferencial wall of a burner body, giving each of them the shape of T consisting of a circumferencial slit portion and a horizontal slit portion. CONSTITUTION:Combustion flames of fuel-air mixture, injected from a burner port 12 of a burner body 2, form a combustion of high calorific capacity and large combustion rate at the T-shaped crossing portion 12c of a circumferencial slit portion 12a and a horizontal slit portion 12b, and a combustion of relatively low carolific capacity and small combustion rate in the rest of the burner port, namely, forming a trigonal-pyramid-shaped flame in a reversed triangular shape, with the flame ends at top of the circumferencial slit 12a, at both ends of the horizontal slit and at the crossing portion 12c respectively, constituting apex of said pyramid. The T-shaped burner ports 12 and small round holes 13, interacting each other, improve their flame-holding condition, making more difficult the occurrence of the lifting combustion, expanding the width of combustion, thus resulting in a stable combustion, limiting red heating of the multiholed cylinder.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a combustor used in a heater or the like.

Conventional technology In recent years, household heating equipment that uses combustion heat has become more popular due to increased awareness of ease of use, comfort, indoor pollution, energy conservation, etc.
Hot-air types have become mainstream, in which the fuel is gasified and burned in a box case, and a convection blower installed at the rear blows out warm air to heat the room. In the case of warm air type combustion engines, there is a need to expand the variable range of combustion amount due to the above-mentioned growing awareness, and various combustion methods have been developed and improved.

An example of a conventional combustor will be described below with reference to the drawings.

In Figure 2, reference numeral 1 denotes a vaporization tube that vaporizes fuel, premixes it with combustion air, and supplies it to the combustion section.At the top is a burner body 2.
is listed. The burner body 2 has a narrow mixing section a integrally diaphragm-shaped on the bottom surface, and a plurality of elongated flame holes 4 forming combustion sections 5 on the side wall. 6 is a pressure equalizing plate that covers the narrow-shaped mixing section 3 within the burner body 2;
It has a plurality of small holes 6a. A porous cylinder 7 is provided in close contact with the outer peripheral side wall of the burner body 2, and is stretched so as to cover the plurality of flame holes 4, and is made of reeds, wire mesh, or a porous material. 8 is a burner cap that closes the upper end opening of the burner body 2. The porous tube 7 stretched over the outer wall of the burner body 2 has its lower end connected to the flange 1 of the vaporizing tube 1.
a, and the upper end is covered with the bent edge 8a of the burner cap 8,
It is designed to be closely supported by the burner body 2. Reference numeral 9 denotes a sheathed heater embedded in the upper part of the vaporization cylinder 1, which is configured to maintain the temperature of the vaporization cylinder 1 above a certain temperature by a temperature controller or the like. Numerals 10 are bolts and nuts that fix the burner cap 8 to the burner body 2.

In the above configuration, fuel injected into the vaporization cylinder 1 by a pump or the like is vaporized in the vaporization cylinder 1 which is heated to a high temperature by the sheathed heater 9, and is sent into the vaporization cylinder 1 by a blower or the like. Premix with combustion air. This premixed vaporized gas is ejected into the burner body 2 through the mixing part 3 of the burner body 2 and the small holes 6a of the pressure equalizing plate 6, and then from the flame hole 4 in the outer peripheral wall thereof. Moreover, this premixed vaporized gas is almost uniformly mixed during its passage, and if an ignition means such as a discharge spark of an ignition electrode is provided near the flame hole 4 where it is ejected, combustion will start and the flame hole 4 Forms a flame that adheres to the surrounding flame-holding cylinder.

Problems to be Solved by the Invention However, in the above configuration, it is difficult to determine the amount of fuel injected into the vaporization cylinder by a pump or the like, the discharge period, the total amount of fuel, or the amount of air blown into the vaporization cylinder by a machine or the like. If various combustion conditions, such as the amount of combustion air sent into the combustion chamber 1, and especially the balance between fuel and combustion air, that is, the air ratio, are not constant, combustion will be disturbed. For example, when the amount of combustion air increases compared to the fuel, the flow velocity of the premixed vaporized gas ejected from the flame hole 4 becomes faster, and it becomes easier to burn away from the flame hole 4, and the flame is cooled. The collision causes a flapping sound, and eventually a large amount of odor and carbon monoxide is emitted, and the futon burns. Therefore, if the area of the flame hole 4 is increased, that is, the load on the flame hole is lowered, and the flow velocity of the premixed vaporized gas ejected from the flame hole 4 is slowed down, so that the premixed vaporized gas comes into close contact with the flame hole 4 and burns more easily, the above-mentioned lifting combustion can be prevented. It becomes difficult to do. In other words, the combustion width against changes in air ratio is expanded.

However, under the air ratio conditions for optimal combustion, the flame adheres too closely to the perforated cylinder 7 near the flame hole 4, and the perforated cylinder 7 itself becomes red hot and reaches a high temperature, eventually exceeding the heat resistance of the perforated cylinder 70 and damaging it. , backfire combustion occurs in the burner body 2 from the damaged part. That is, there was a problem in that it was extremely difficult to simultaneously prevent the above-mentioned expansion of the combustion width and damage to the porous tube 7 itself due to red heat.

The present invention was made in view of the above-mentioned problems, and it is possible to lower the temperature of the porous cylinder, reduce lifting combustion, enlarge the combustor, and obtain a good combustion state even if the combustion conditions change slightly. The purpose is to

Means for Solving the Problems In order to solve the above-mentioned problems, the combustion device of the present invention has a flame hole provided in the peripheral wall of the burner body in a T-shape consisting of a horizontal slit portion and a vertical slit portion.

Function The present invention is based on the above-mentioned nine-part structure, and the combustion flame of the mixed vaporized gas ejected from the flame hole of the parbody has a high combustion amount with a flame hole load at the joint between the vertical slit portion and the horizontal slit portion of the figure 7. The other remaining parts are burned with a slightly lower flame hole load and a smaller amount of combustion. In other words, a stable triangular flame is formed with the apexes being the lower end of the vertical slit, both ends of the horizontal slit, and the flame tip of the joint.

EXAMPLE Hereinafter, a combustor according to an embodiment of the present invention will be described with reference to the drawings. The same parts as in the conventional example will be given the same reference numerals, explanations will be omitted, and only different parts will be explained.

In FIG. 1, the flame hole 11 disposed on the side wall of the burner body 2 consists of a flame hole 12 in the shape of a letter 1 and a flame hole 13 in the form of a small round hole provided above the vertical slit portion 12a in the shape of a letter T. Each of them is arranged in a horizontal row around the circumference of the burner body. The burner body 2 and the porous holes 87 are closely fixed by welding or the like between the T-shaped flame hole 12 and the small round flame hole 1a.

In the above-described configuration, the combustion flame of the mixed vaporized gas ejected from the flame hole 12 of the burner body 2 is transmitted through the T-shaped vertical slit portion 12& and the horizontal slit portion 12&. The joint part 12c of 2b is used for combustion with a high flame hole load and a large amount of combustion, and the remaining part is used for combustion with a slightly lower flame hole load and a small amount of combustion. and horizontal slit part 1
A triangular pyramidal flame is formed with vertices at both ends of 2b and the tip of the flame at the joint 13, respectively. Here, the flame ejected from the flame hole 12 has a tendency to be more flame-holding toward the north, both thermally and because of the mixture vaporization that ejects. Combustion tends to lift easily, but
Combustion with a low surrounding flame hole load has strong flame holding, so flame holding tends to be stronger overall. Furthermore, in this embodiment, a small round flame hole 13 is provided above the vertical slit portion 12a of the T-shaped flame hole 12, so that the T-shaped flame hole 12
The small round flame hole 13 mutually strengthens flame holding, making lifting combustion even more difficult. On the other hand, if the flame holding tendency becomes strong in this way, there is a concern about red heat of the porous tube 7 from a heat resistance perspective, but the overall flame hole load of the branch flame holes 11 that suppresses the above-mentioned lifting combustion can be increased. Porous tube 7
The temperature does not have to be much of a problem. Furthermore, since the flame hole 12 of the porous tube 7 and the flame hole 13 disposed above it are closely attached by spot welding 11, etc., the porous tube is easily caused by the interference of the flames of the flame holes 12 and 13. Since the red heat of the porous tube 7 can also be prevented, there is almost no need to worry about the red heat of the porous cylinder 7.

Effects of the Invention As described above, according to the present invention, lifting combustion can be prevented and the combustion width can be expanded, and red heat of the porous cylinder can be suppressed, so that safe and stable combustion can be carried out over a long period of time.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the combustor of the present invention, and FIG. 2 is a sectional view showing a conventional combustor. 2... Burner body, 3... Mixing section,
7... Porous cylinder, 11... Flame hole, 12.
...7-shaped flame hole, 12a...--vertical slit part, 12b...horizontal slit part, 13...
...Round flame hole. Name of agent: Patent attorney Toshio Nakao and one other person
Ritsuka

Claims (3)

[Claims] (1) A mixing section that mixes air and fuel, a burner body that burns the mixed gas from the mixing section through a plurality of flame holes provided on its outer peripheral wall, and a perforated tube arranged on the outer periphery of the burner body. The burner body has flame holes arranged in a circumferential direction in a T-shape consisting of horizontal slits and vertical slits. (2) The combustor according to claim 1, wherein the flame holes are arranged in two rows, upper and lower, with the lower row having a T-shape and the upper row having approximately round small holes. (3) The combustor according to claim 2, wherein a perforated cylinder on the outer periphery of the peripheral wall of the burner body is fixed by spot welding or the like between the upper and lower flame holes of the burner body.