JPS633109A - Combustion equipment - Google Patents

Abstract

PURPOSE:To prevent soot and CO, and to reduce combustion noise and bad odor at the time of fire extinction in combustion equipment by providing a plurality of raised portions projected to the inside of the internal periphery of the wall of an auxiliary flame cylinder above through-holes for combustion exhaust gas which are provided on the side wall in the lower part of an auxiliary flame cylinder. CONSTITUTION:A fuel injected from a fuel feeder 11 into an auxiliary flame cylinder 15 through the opening 16 of the cylinder 15 is evaporated by recirculating gas flowing into the cylinder 15 from through-holes 17 for combustion exhaust gas which are provided in the lower part of the cylinder 15. Combustion air flowing into the auxiliary flame cylinder 15 from air injection port 14 in the lower part of a flame cylinder 13 goes up along the inside wall of the cylinder 15. During this time turbulences are involved in the air by raised portions 18 provided in the middle part of the auxiliary flame cylinder 15, so that mixture of the air with the evaporated fuel is promoted. The evaporation of a mixed gas is promoted further by a secondary recirculating gas 27 flowing into the cylinder 15 through openings 18a which are made by the raised portions 18 on the inside wall in the middle part of the auxiliary flame cylinder 15. With such an arrangement, soot and CO are prevented, and combustion noise can be reduced because combustion takes place by stabilized flames.

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 6 that 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 from the 77-in 9a are mixed between the middle cylinder 5 and the auxiliary combustion cylinder 8 to promote vaporization. Then, a flame was formed at the air jet hole 4 at the upper part of the middle cylinder 5, and combustion occurred.

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 promotes the vaporization of the fuel supplied from 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 at the air jet hole 4 in the upper part of the middle cylinder 5, and combustion occurs. However, since the air supplied from the air jet hole 4 at the lower part of the middle cylinder 5 becomes a flow that swirls and rises along the inner wall surface of the auxiliary combustion cylinder 8, the air is supplied from the fuel supply device 3 vaporized by the recirculation flow. As a result, the flame formed at the air nozzle 4 in the upper part of the middle cylinder 5 becomes partially air-deficient or air-excessive, producing soot, CQ, and pulsating combustion. This had the problem of generating combustion noise.

The present invention solves such conventional problems by promoting the mixing of the fuel vaporized by the recirculation flow with the air supplied from the air jet hole at the bottom of the middle cylinder, and increasing the amount of the recirculation flow. The purpose is to promote vaporization of mixed gas, prevent the generation of soot and CO, reduce combustion noise, and reduce fire extinguishing odor after extinguishing a fire.

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 passage hole for combustion waste gas, and is provided with an auxiliary combustion cylinder in which a plurality of cut and raised portions are provided on the circumference of the upper wall surface of the passage hole for combustion waste gas so as to protrude inwardly.

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. At the same time, a part of the recirculated flow flows into the auxiliary combustion cylinder from the opening of the cut and raised part, which promotes the vaporization of the mixed gas, reducing soot and CO.
In addition, the flame burns stably, which reduces combustion noise. Also, there is no lack of fuel vaporization, and no unburned gas is generated after the fire is extinguished, reducing fire extinguishing odor. It is.

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 1o, 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 circumferential wall, a plurality of combustion waste gas passage holes are provided in the lower circumferential wall, and a plurality of cut and raised portions 18 are provided in the central circumferential wall that protrude inward and are arranged in a staggered manner. 19 is a fan for blowing combustion air; 20 is a blower; 21
22 is a water supply port provided in the water can part 1Q, 23 is a hot water supply port provided in the water can part 1o, and 24 is provided above the middle cylinder 13. This is a baffle plate having approximately the same diameter as the combustion chamber 9.

In the above configuration, fuel is sent from the fuel supply device 11 into the auxiliary combustion tube 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 then 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 due to the discharge energy, the fuel supplied from the fuel supply device 11 and the air outlet hole provided on the peripheral wall of the lower part of the middle cylinder 13 are diffused and burned. As the temperature inside the combustion chamber 9 rises, a flame is formed in the air jet hole 14 in the upper part of the middle cylinder 13 and burns as a blue flame toward the side wall of the combustion chamber 9.

The water supplied through the water supply port 22 is heat exchanged with the combustion waste gas while passing through the water can part 10, and is further transferred to the powerful plate 2.
4, heat exchange is promoted, and hot water is supplied from the hot water supply port 23.

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 baffle plate 24, and while exchanging heat with the water can part 10, the - part is a cut-out opening in the peripheral wall of the central part of the auxiliary combustion tube 15. 18a into the auxiliary combustion tube 15, and the other part becomes a recirculation flow that enters the auxiliary combustion tube 15 through the combustion waste gas passage hole 17 provided at the lower part of the auxiliary combustion tube 15.

The fuel that enters the auxiliary combustion tube 16 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 16 from the combustion waste gas passage hole 1 at the bottom of the auxiliary combustion tube 15. . An auxiliary combustion cylinder 1 from the air jet hole 14 at the bottom of the middle cylinder 13
Combustion air entering the combustion chamber 5 rises along the inner wall surface of the auxiliary combustion tube 15, but turbulence occurs due to the cut and raised portion 18 at the center of the auxiliary combustion tube 15, promoting mixing with the vaporized fuel and The vaporization of the air-fuel mixture is promoted by the recirculation flow from the cut-and-raised opening 18a in the central peripheral wall of the auxiliary combustion cylinder 15.

With this configuration, the mixing of fuel and combustion air in the auxiliary combustion tube 15 is promoted by the turbulence caused by the cut and raised portion 18, and the recirculation flow from the combustion waste gas passage hole 17 at the bottom of the auxiliary combustion tube 15 improves the air-fuel mixture. In addition to vaporization, the recirculation flow from the cut-and-raised opening 18a in the center of the auxiliary combustion tube 15 further promotes vaporization, preventing the generation of soot, co, etc., and stably burning the flame. This has the effect of reducing combustion noise.

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

(1) A plurality of inwardly protruding cut-and-raised parts 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 flows along the inner surface of the auxiliary cylinder. This prevents the fuel from rising and creates turbulent flow, so 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 makes the mixing ratio uniform.
This has the effect of preventing the generation of soot, CO, etc., and preventing an increase in combustion furnace noise due to pulsating combustion.

(2) Recirculation flow from the outside of the auxiliary combustion tube enters the auxiliary combustion tube through the combustion waste gas passage hole in the lower peripheral wall of the auxiliary combustion tube and the cut-and-raised opening in the center of the auxiliary combustion tube, increasing the amount of recirculation flow. However, the vaporization of the mixture is promoted by the recirculating flow from the cut-and-raised opening in the center of the auxiliary combustion tube, eliminating insufficient fuel vaporization, and after extinguishing, no unburnt gas is generated, reducing extinguishing odor. There is an effect.

[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. q is a side sectional view of a conventional combustion device. 9... Combustion chamber, 11... Fuel supply device, 13... Middle cylinder, 14... Air jet hole, 1
6...--Auxiliary combustion tube, 16...Opening, 17.
... Combustion waste gas passage hole, 18 ... Cut and raised part, 1
8a...Opening for cutting and raising. Name of agent: Patent attorney Toshio Nakao and one other person q-
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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, and the middle cylinder. is arranged concentrically on the outer periphery of the fuel supply device, has an opening facing the fuel supply device, has a plurality of combustion waste gas passage holes in a lower peripheral wall, and has an upper part of the combustion waste gas passage holes. A combustion device consisting of an auxiliary combustion cylinder in which a plurality of cut and raised portions and cut and raised openings are provided on the circumference so as to protrude inward from a wall surface. (2) The combustion device according to claim 1, wherein a plurality of inwardly protruding cut-and-raised portions are provided on the wall surface of the auxiliary combustion cylinder and are arranged in a staggered manner.