JPS633108A - combustion device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a combustion device used in domestic water heaters, heating equipment, and the like.

2. Description of the Related Art As shown in FIG. 2, a conventional combustion device of this type includes a fuel supply device 3 facing a combustion chamber 2 having a water can portion 1 on a side wall, and a fuel supply device 3 installed vertically in the center of the combustion chamber 2. A middle cylinder 5 having a plurality of air ejection holes 4 on the wall surface, an opening θ which stands concentrically on the outer periphery of the middle cylinder 5 and faces the fuel supply device 3, and a lower peripheral wall thereof. Multiple combustion waste gas passage holes 7
It is composed of a cylindrical auxiliary combustion tube 8 having a cylindrical shape. Then, the fuel supplied from the fuel supply device 3 and the air supplied from the air jet hole 4 at the lower part of the middle cylinder 5 are mixed between the middle cylinder 5 and the auxiliary combustion cylinder 8, and vaporization is promoted. A flame was formed at the air outlet 4 at the top of the 5, which caused combustion.

Problems to be Solved by the Invention However, in the above configuration, a part of the waste gas combusted in the air injection hole 4 in the upper part of the middle cylinder 5 passes through the outside of the auxiliary combustion tube 8 and is exposed to the lower circumferential wall of the auxiliary combustion tube 8. A recirculation flow enters the inside of the auxiliary combustion cylinder 8 through the combustion waste gas passage hole 7 provided. The recirculated flow that has entered the auxiliary combustion cylinder 8 is also promoted to vaporize the supplied fuel by the fuel supply device 3, and the vaporized fuel is mixed with the air supplied from the air jet hole 4 at the bottom of the middle cylinder 5. Then, a flame is formed and combusted in the air outlet 4 at the upper part of the middle cylinder 5, and the air supplied from the air outlet 4 at the lower part of the middle cylinder 5 swirls and rises along the inner wall surface of the auxiliary combustion tube 8. As a result, the mixture with the fuel supplied from the fuel supply device 3 that has been vaporized by the recirculation flow is insufficient, and the flame formed at the air injection hole 4 at the upper part of the middle cylinder 5 is caused by a partial lack of air. The present invention solves these conventional problems, such as excess air, generating soot and CO, pulsating combustion, and combustion noise. The purpose is to promote the mixing of air and air supplied from the air outlet at the bottom of the middle cylinder, prevent the generation of soot and CO, and reduce combustion noise.

Means for Solving the Problems In order to solve the above problems, the combustion apparatus of the present invention includes a bottomed cylindrical combustion chamber, a fuel supply device facing the combustion chamber, and a fuel supply device located in the center of the combustion chamber. a middle cylinder that is erected and has a plurality of air ejection holes on a wall surface; a middle cylinder that is erected concentrically on the outer periphery of the middle cylinder and has an opening facing the fuel supply device; It has a combustion waste gas passage hole and a cylindrical auxiliary combustion tube having a plurality of sections on its circumference that protrude inward from the combustion waste gas passage hole and the upper wall surface.

Effect of the Invention With the above-described configuration, the air supplied from the air jet hole at the bottom of the middle cylinder rises along the inner surface of the auxiliary cylinder because the cut and raised part causes disturbance, so that the air is not supplied from the fuel supply device. Mixing with the fuel is promoted, the generation of soot, co, etc. can be prevented, and since the flame burns stably, combustion noise can be reduced.

Embodiments Hereinafter, embodiments of the present invention will be described based on the accompanying drawings. In FIGS. 1 and 2, 9 is a bottomed cylindrical combustion chamber having a water can part 10, 11 is a fuel supply device facing the combustion chamber 9, and 12 is an ignition device for igniting the fuel supply device 11. An electrode 13 is erected in the center of the combustion chamber 9 and has a plurality of air injection holes 14 on the wall surface. A middle cylinder 15 is erected concentrically around the outer periphery of the middle cylinder 13 and faces the fuel supply device 11. An opening 16 is provided in the lower peripheral wall, a plurality of combustion waste gas passage holes are provided in the lower peripheral wall, and a plurality of inwardly protruding sections 18 are arranged in multiple stages in a staggered manner in the central peripheral wall. 19 is a fan for blowing combustion air; 20 is a blower motor; 21 is a blowing passage for combustion air; 2;
2 is a water supply port provided in the water can part 1o, 23 is a hot water supply port provided in the water can part 10, and 24 is a baffle plate provided above the middle cylinder 13 and having approximately the same diameter as the combustion chamber 9. be.

In the above configuration, fuel is sent from the fuel supply device 11 into the auxiliary combustion node 15 through the opening 16 of the auxiliary combustion tube 15 .

Combustion air is sent into the middle cylinder 13 through the air passage 21 by the blower motor 2o and the fan 19, and into the combustion chamber 9 through the air jet holes 14 provided in the peripheral wall of the middle cylinder 13. When the ignition electrode 12 is energized, a spark is discharged between the electrodes, and the discharge energy causes the fuel supplied from the fuel supply device 11 to be ejected from the air jet hole 14 provided in the peripheral wall at the bottom of the middle cylinder 13 and into the auxiliary combustion cylinder 15. The mixture with the air sent to the engine is ignited. At the initial stage of ignition, macular diffusion combustion occurs between the middle cylinder 13 and the auxiliary combustion cylinder 15, and as the temperature inside the combustion chamber 9 rises, a flame is formed in the air nozzle 14 at the upper part of the middle cylinder 13, and a blue flame is produced toward the side wall of the combustion chamber 9. Burn. The water supplied from the water supply port 22 undergoes heat exchange with the combustion waste gas while passing through the water can part 10, and further heat exchange is promoted by the baffle plate 24.
hot water is supplied.

A part of the combustion waste gas passes through the outside of the auxiliary combustion tube 15 due to the pressure regulating action of the buckle plate 24, and enters the combustion waste gas passage hole 1 provided at the lower part of the auxiliary combustion tube 15 while exchanging heat with the water can part 1o. The recirculation flow enters the auxiliary combustion cylinder 15 from the end.

The fuel that enters the auxiliary combustion tube 15 from the fuel supply device 11 through the opening 16 of the auxiliary combustion tube 15 is vaporized by the recirculation flow that enters the auxiliary combustion tube 15 through the combustion waste gas passage hole 1 in the lower part of the auxiliary combustion tube 15. Ru. The auxiliary combustion cylinder 1 is connected to the air outlet 14 at the bottom of the middle cylinder 13.
Combustion air entering the auxiliary combustion tube 15 rises along the inner wall surface of the auxiliary combustion tube 15, but turbulence occurs due to the section 18 at the center of the auxiliary combustion tube 15, and since the sections 18 are arranged in a staggered manner in multiple stages, the vaporized fuel This promotes mixing with the air outlet 1 at the top of the middle cylinder 13.
A flame is formed at 4.

According to this configuration, the fuel vaporized by the recirculation flow from the combustion waste gas passage hole 17 in the lower circumferential wall of the auxiliary combustion cylinder 16 is mixed with the combustion air from the air jet hole 14 in the lower part of the middle cylinder 13 in the intercept 18. In addition, since the slices 18 are arranged in a staggered manner, the state of the flame formed at the air jet hole 14 at the upper part of the middle cylinder 13 is reduced to soot, C, etc.
Even though there is no generation of O, there is an effect that combustion noise can be reduced due to stable combustion.

Effects of the Invention As described above, the combustion apparatus of the present invention provides the following effects.

(1) A plurality of sections protruding inward are provided at the upper part of the combustion waste gas passage hole in the lower circumferential wall of the auxiliary cylinder, so that the combustion air from the air jet hole at the bottom of the middle cylinder rises along the inner surface of the auxiliary cylinder. As a result, the recirculation flow from the combustion waste gas passage hole at the bottom of the auxiliary combustion cylinder promotes mixing with the vaporized fuel, and the mixture ratio becomes constant, resulting in soot.

It has the effect of preventing the generation of Co, etc. and also preventing an increase in combustion noise due to pulsating combustion.

[Brief explanation of drawings]

FIG. 1 is a side sectional view of a combustion device according to an embodiment of the present invention, and FIG. 2 is a side sectional view of a conventional combustion device. 9... Combustion chamber, 11... Fuel supply device,
13... Middle cylinder, 14... Air outlet, 1
5... auxiliary combustion tube, 16...-opening, 17...-
- Combustion waste gas passage hole, 18... section. Name of agent: Patent attorney Toshio Nakao and one other personq-
-Sabotage Tiger! to--Ichihyo Mengya j5-Gaisu next, top 2nd figure

Claims (2)

[Claims] (1) A cylindrical combustion chamber with a bottom, a fuel supply device facing the combustion chamber, a middle cylinder erected in the center of the combustion chamber and having a plurality of air injection holes on a wall surface; An opening is provided concentrically on the outer periphery of the cylinder, facing the fuel supply device, and has a plurality of combustion waste gas passage holes in the lower circumferential wall. A combustion device consisting of a cylindrical auxiliary combustion tube with a plurality of sections on its inner periphery that protrude inward from a wall surface. (2) The combustion device according to claim 1, wherein a plurality of inwardly protruding sections are provided in multiple stages on the wall surface of the auxiliary combustion cylinder and are arranged in a staggered manner.