JPH0360007B2 - - Google Patents

Description

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

2. Description of the Related Art As shown in FIG. 2, a conventional combustion device of this type has a fuel supply device 3 facing into a combustion chamber 2 having a water can portion 1 on a side wall. A heat insulating material 4 such as a firebox brick having approximately the same diameter as the combustion chamber 2 is provided on the bottom surface of the combustion chamber 2, a middle cylinder 6 erected in the center and having a plurality of air injection holes 5 on the wall surface, and the middle cylinder 6. A bottomed cylindrical auxiliary combustion cylinder 9 is provided with an opening 7 facing the fuel supply device 3 and a plurality of combustion waste gas passages 8 on the lower peripheral wall. This auxiliary combustion tube 9
The fuel supplied from the fuel supply device 3 and the air supplied from the middle cylinder 6 are mixed between the fuel supply device 3 and the middle cylinder 6 to promote vaporization, and a flame is formed at the upper part of the middle cylinder 6 to cause combustion. Ta.

Problems to be Solved by the Invention However, in the above configuration, a part of the waste gas burned in the upper part of the middle cylinder passes outside the auxiliary combustion cylinder, and from the waste gas passage in the lower part of the auxiliary cylinder, it flows inside the auxiliary cylinder. The combustion gas enters the combustion chamber and accelerates the vaporization of the fuel supplied from the fuel supply system, but the temperature of this waste gas decreases as it exchanges heat with water on the side wall of the water can, and at the bottom of the combustion chamber, water due to the combustion waste gas Since the temperature rise in the can section is extremely low, condensation occurs on the side walls of the combustion chamber, and the condensed water accumulates on the bottom of the combustion chamber, impregnating the insulation material. In addition, since the insulation material is exposed to the combustion chamber outside the auxiliary combustion tube, if unburned particles are generated, the insulation material will be impregnated.
The problem was that it evaporated when extinguishing a fire, producing a bad odor. Also, the waste gas with recirculation flow is
Since the recirculation flow does not move smoothly and stagnates in the side wall section A of the water can at the bottom of the combustion chamber, the amount of heat held by the waste gas containing the recirculation flow decreases, preventing the promotion of fuel vaporization and starting combustion. This has the problem of deteriorating the characteristics of the waste gas during combustion and generating unburned gas and bad odors.

The present invention solves such conventional problems,
The waste gas having a recirculation flow is smoothly transferred to the recirculation flow without condensation on the side wall of the water can, promoting vaporization, and preventing unburnt gas from impregnating the insulation material at the bottom of the combustion chamber. The purpose is to prevent the generation of unheated gas and bad odors.

Means for Solving the Problems In order to solve the above problems, the combustion apparatus of the present invention includes a cylindrical combustion chamber with a bottom, a fuel supply device facing into the combustion chamber, and a combustion chamber provided on the bottom surface of the combustion chamber. a heat insulating material having approximately the same diameter as the combustion chamber; the upper surface of the heat insulating material is integral with the bottom; the outer circumference has substantially the same diameter as the combustion chamber and extends to the lower part of the combustion chamber below the fuel supply device; a second auxiliary combustion cylinder whose corner portion forms a rounded part; a middle cylinder which stands upright in the center of the combustion chamber and has a plurality of air injection holes on a wall surface; The combustion chamber is provided with an opening facing the fuel supply device, and an auxiliary combustion cylinder having a plurality of openings in the lower peripheral wall.

Effect The present invention has the above configuration, so that a part of the waste gas burned in the upper part of the middle cylinder passes through the outside of the auxiliary combustion cylinder, and the second
In order to form a recirculation flow from the peripheral wall of the auxiliary combustion chamber, through the bottom surface of the second auxiliary combustion cylinder, and into the inside of the auxiliary combustion cylinder from the waste gas passage section at the lower part of the auxiliary combustion cylinder, the water can part and the waste gas with a significantly low temperature rise at the bottom of the combustion chamber are formed. In addition, since the corners of the second auxiliary combustion cylinder are formed in an R shape, the waste gas in the recirculation flow can be smoothly transferred without being accumulated at the corners. , the waste gas in the recirculation flow enters the inside of the auxiliary combustion tube and accelerates the vaporization of the fuel without reducing the amount of heat it possesses. or,
The heat insulating material is covered with the second auxiliary combustion tube and the second
Because the auxiliary combustion tube is in metal contact with the middle cylinder and the auxiliary combustion tube, the second auxiliary combustion tube is maintained at a high temperature, and even if unburned gas is generated, it is instantaneously vaporized without impregnating the insulation material, and the waste gas is This will improve the characteristics.

Embodiments Hereinafter, embodiments of the present invention will be described based on the accompanying drawings. In FIG. 1, 11 is a cylindrical combustion chamber with a bottom, 12 is a fuel supply device facing into the combustion chamber 11, and 13 is a plurality of air jet holes installed in the center of the combustion chamber 11 on the wall surface. a middle cylinder having 14, 1
5 is a heat insulating material such as a firebox brick having approximately the same diameter as the combustion chamber 11 at the bottom of the combustion chamber 11, and 16 is a bottomed cylindrical corner portion 17 having approximately the same diameter as the heat insulating material 15 on the top surface of the heat insulating material 15.
is a second auxiliary combustion cylinder formed in an R shape; 18 is the middle cylinder 1;
3, an auxiliary combustion tube 20 is provided with an opening facing the fuel supply device 12, and a plurality of combustion exhaust gas passages 19 are provided on the lower peripheral wall; fan for blowing air,
21 is a blower motor, 22 is a combustion air blowing path, 23 is an ignition device, 24 is a water can part provided on the side wall of the combustion chamber 11, 25 is a water supply port provided in the water can part, 26 is a hot water supply port, A ring 27 is provided above the middle cylinder 13, has approximately the same diameter as the combustion chamber 11, and has an opening in the center.

In the above configuration, combustion is sent from the fuel supply device 12 into the auxiliary combustion cylinder 18 . Combustion air is sent into the middle cylinder 13 through the air passage 22 by the blower motor 21 and the fan 20, and into the combustion chamber 11 through an air jet hole 14 provided in the peripheral wall of the middle cylinder 13. When ignited by the ignition device 23, a flame is formed in the air jet hole 14 in the upper part of the middle cylinder 13 toward the side wall of the combustion chamber 11. The generated combustion waste gas is discharged upward while exchanging heat with the water can part 24, but some of it is discharged into the middle cylinder 13.
Due to the pressure regulating action of the ring 27 provided above,
The auxiliary combustion tube 18 passes through the outside of the auxiliary combustion tube 18 and runs along the peripheral wall of the second auxiliary combustion tube 16 while exchanging heat with the water can part 24.
A recirculation flow enters the auxiliary combustion cylinder 18 from the combustion waste gas passage section 19 provided at the lower part of the combustion chamber. The purpose of the heat insulating material 15 is to prevent the temperature outside the combustion chamber 11 from rising due to the temperature inside the combustion chamber 11.

The water supplied from the water supply port 25 undergoes heat exchange with the combustion waste gas while passing through the water can part 24, and the water is supplied from the water supply port 25.
Hot water is supplied from 6. At the bottom of the combustion chamber 11, the temperature rise in the water can part 24 due to heat exchange with the combustion waste gas is extremely low. The combustion waste gas flows through the water can part 24 on the side wall of the combustion chamber 11 into the combustion chamber 1.
Since the combustion waste gas is recirculated to the bottom of the combustion chamber 11 and promotes the temperature rise of the water can part 24, the combustion waste gas condenses and stays at the bottom of the combustion chamber 11, preventing the insulation material 15 from being impregnated and causing a foul odor after extinguishing. It has the effect of not allowing

The heat insulating material 15 is completely covered by the second auxiliary combustion tube 16 and is not exposed to the combustion chamber 11, and the second auxiliary combustion tube 16 and the second auxiliary combustion tube 18 are in metal contact with the attachment structure such as welding or screwing, so that heat is conducted. Even if the high temperature state is maintained and unburned particles are generated, the heat insulating material 15 is not impregnated and is instantaneously vaporized, preventing a decrease in the heat content of the combustion waste gas in the recirculation flow and promoting the vaporization of the fuel. This has the effect of improving the characteristics of the exhaust gas and preventing the generation of unburned gas and bad odors.

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

(1) Since the second auxiliary combustion tube is provided and the corners are formed into an R shape, the combustion waste gas in the recirculation flow is recirculated to the bottom of the combustion chamber, increasing heat exchange efficiency, and preventing combustion gas from condensing. It stays at the bottom of the combustion chamber and impregnates the insulation material, which has the effect of not producing a bad odor after the fire is extinguished.

(2) The heat insulating material is completely covered by the second auxiliary combustion tube and is not exposed inside the combustion chamber, and the second auxiliary combustion tube is in metal contact with the auxiliary combustion tube through a mounting structure such as welding or screwing, so that heat is conducted. The condition is maintained, and even if unburned particles are generated, they will not impregnate the insulation material and will be instantaneously vaporized, preventing a decrease in the heat capacity of the combustion waste gas in the recirculation flow and promoting fuel vaporization. Therefore, it has the effect of not generating unburned gas or bad odor.

[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. 11... Combustion chamber, 12... Fuel supply device, 13
...Middle cylinder, 14...Air jet port, 15...Insulating material, 16...Second auxiliary combustion tube, 18...Auxiliary combustion tube, 20
...Juan, 24...Water can club, 27...Ring.

Claims (1)

[Claims] 1 A cylindrical combustion chamber with a bottom, a fuel supply device facing into the combustion chamber, a heat insulating material such as a firebox brick provided on the bottom surface of the combustion chamber and having approximately the same diameter as the combustion chamber, and the above-mentioned a second auxiliary combustion cylinder, which has an upper surface of the heat insulating material as a bottom, has an outer circumferential portion that has approximately the same diameter as the combustion chamber and extends to a lower part of the combustion chamber below the fuel supply device, and has a curved angle between the bottom and the outer circumferential portion; , a middle cylinder erected in the center of the combustion chamber and having a plurality of air jet ports on a wall surface; and a middle cylinder erected concentrically around the outer periphery of the middle cylinder, and an opening facing the fuel supply device. , a combustion device consisting of an auxiliary combustion tube in which a plurality of combustion waste gas passages are provided in a lower peripheral wall.