JPH01134108A - Burning apparatus - Google Patents

Abstract

PURPOSE:To make the combustion chamber compact and reduce the combustion noise level in a domestic burning apparatus by displacing the opposing inclined air holes lines by a half pitch and forcibly supplying secondary air to the flame so as to form a steady flame. CONSTITUTION:Premixed gas ejected from the flame opening 12 is supplied to the combustion chamber 16. On the other hand, the secondary air first enters into an air chamber 13, and part of it enters into an air chamber 14 after regulated to a predetermined flow rate in a flow rate regulating opening 15. The air is supplied from a flame stabilizing opening 18 parallelly to the ejection direction of the premixed gas near the flame opening 12 so as to form a steady flame stabilizing flam F1. The remaining secondary air in the air chamber 13 passes through inclined air holes 17 to be supplied into the combustion chamber 16 at an angle relative to the ejection direction of the premixed gas, where it is forcibly mixed with unburnt gas and forms a short flame F2. Since the ejection pattern from the opposing inclined air holes 17 is displaced by a half pitch, the flame F2 formed along the air ejection pattern becomes pleated with a half pitch displacement.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention aims to reduce noise by forcibly supplying secondary air to a flame to form a stable flame, and to reduce the size of equipment by performing high-load combustion. This relates to a household combustion device designed to

2. Description of the Related Art Conventionally, this type of combustion apparatus has a configuration as shown in FIG. In Fig. 4, a mixture chamber 1 and a flame port 2 are provided in the center, and a pair of air chambers 3 for inclined air are provided on both sides.
is provided. A pair of air chambers 4 for flame-holding air are in contact with the air chamber 3 on both sides of the flame port 2 via a control plate 5. The inclined and flame-holding air chambers 3.4 are provided with respective air lowers, 8, which open into the combustion chamber 6. Here, the air lower is provided on the downstream side of the flame nozzle 2 and at an angle of inclination to the premixed air jetted from the flame nozzle 2, and the air port 8 is provided on the same plane as the flame nozzle 2 and approximately parallel to it. It is being The combustion chamber 6 is surrounded by a heat exchange drum 9 and on the downstream side by heat exchange fins 10.

The premixture ejected from the flame port 2 is supplied to the combustion chamber 6 6 Meanwhile, the secondary air first enters the air chamber 3 , and a part of it is controlled to a predetermined flow rate by the control board 5 and is sent to the air chamber 6 . Enter 4.

The secondary air that has entered the air chamber 4 is supplied from the periphery of the flame port 2 through the air port 8 substantially parallel to the outflow direction of the premixed gas to form a stable flame F'1.

In addition, the remaining secondary air in the air chamber 3 passes through the air lowers facing each other at the same pitch, and is supplied into the combustion chamber 6 at an angle of inclination with respect to the injection direction of the premixture, where it is forcibly mixed with unburned gas and the flame lengthens. A small flame F'2 is formed. The combustion gas that has completed the combustion reaction exchanges heat with the heat exchanger drum 9 and the fins 10, and then is released into the outside air. (For example, Japanese Unexamined Patent Application Publication No. 58-75771) Problems to be Solved by the Invention However, in the above configuration, the flame length formed by the secondary air supplied at an angle of inclination to the jetting direction of the premixture is small. Combustion noise caused by flame turbulence,
Since combustion noise is suppressed by a stable flame formed by secondary air supplied substantially parallel to the jetting direction of the premixture, there is a problem in that there is a limit to the reduction of combustion noise.

The present invention solves such conventional problems, and aims to downsize the combustion chamber and reduce combustion noise.

Means for Solving the Problems In order to solve the above-mentioned problems, the low-noise, high-load combustion device of the present invention has a premixing chamber installed downstream of the mixture chamber that mixes fuel and air to create a premixture. A flame opening section consisting of a large number of flame openings from which air is spouted is provided, and a large number of flame-holding air jets out air at low speed from both longitudinal sides of the flame opening section, almost parallel to the flow of the air-fuel mixture jetted out from the flame opening. A vent is provided on the downstream side of the flame-holding air vent.
In a burner in which a large number of inclined air ports are arranged in a zigzag or U-shape in the longitudinal direction of the burner, which blows out air from both sides in the longitudinal direction of the burner port, crossing the flow of the mixture ejected from the burner port. , the zigzag or U-shaped arrays of opposing inclined air ports are offset by a half pitch and are opposed to each other.

Effect: With the above-described configuration, the present invention forms a stable and reliable flame-stabilizing flame by the flame-stabilizing air jetted from the flame-stabilizing air port almost parallel to the premixed air flow spouted from the flame port, and By making the flame surface formed by the inclined air ejected from the inclined air ports on both sides continuous with this flame-holding surface, turbulence of the entire flame surface is suppressed and combustion noise is reduced.

Furthermore, by making the jetting patterns of the opposing inclined air ports offset by half a pitch and facing each other, the flame surfaces formed along the jetting patterns of the inclined air are also shifted by half a pitch and face each other, resulting in collision of the opposing flame surfaces. This eliminates turbulence in the flame surface and reduces combustion noise.

In addition, the flame surface formed by the inclined air has inclined air ports arranged in a zigzag pattern, so that the reaction surface does not form a large pleated flame and has an inclined angle with respect to the flow of unburned gas. Since it is ejected, forced mixing is promoted, the flame length is shortened, and the combustion chamber can be made smaller.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

In FIG. 1, a mixture chamber 11 and a flame port 12 are provided in the center, and air chambers 13 for inclined air are provided on both sides of the flame port 12 in the longitudinal direction. A pair of air chambers 14 for flame stabilizing air are communicated with the air chamber 13 via flow rate control ports 15 on both longitudinal sides of the flame port 12 . Air chamber 1 for inclined air
3 and the air chamber 14 for flame stabilizing air are provided with an inclined air port 17 and a flame stabilizing air port 18, which are air ports opening into the combustion chamber 16, respectively.

Here, the inclined air ports 17 are provided on the downstream side of the flame port 12 and have an inclination angle to the premixed air jetted from the flame port 12, and the jetting patterns of the opposing sloped air ports 17 are shifted by half a pitch. The opposing ◇flame stabilizing air ports 18 are provided substantially parallel to and in the vicinity of the flame port 12 on substantially the same plane. The combustion chamber 16 is surrounded by a heat exchange drum 19 and on the downstream side by heat exchange fins 20.

In the above configuration, the premixture ejected from the flame port 12 is supplied to the combustion chamber 16. On the other hand, the secondary air first enters the air chamber 13, and a portion thereof is controlled to a predetermined flow rate by the flow rate control port 15 and enters the air chamber 14.

The secondary air that has entered the air chamber 14 is supplied from the flame stabilizing air port 18 near the periphery of the flame bottom part 12 in a direction substantially parallel to the jetting direction of the premixture, thereby forming a stable flame stabilizing flame F1.

In addition, the remaining secondary air in the air chamber 13 is removed from the inclined air port 17.
), the premixture is supplied into the combustion chamber at an angle of inclination to the ejection direction, and is forcibly mixed with unburned gas, resulting in a small flame length.
form 2. At this time, the jetting pattern of the opposing inclined air ports 17 is shifted by half a pitch, and the flame F2 formed along the jetting pattern of the air is created by the collision between the opposing flames shifted by half a pitch. It becomes a flame.

The combustion gas that has completed the combustion reaction undergoes heat exchange with the heat exchange drum 19 and the fins 20, and then is released into the outside air.

Effects of the Invention As described above, the low-noise, high-load combustion apparatus of the present invention provides the following effects.

(1) The flame-holding air jetted out almost parallel to the premixed airflow jetted out from the flame opening forms a stable and reliable flame-holding flame, and the flame front formed by the inclined air and this By making the flame holding surface continuous, turbulence of the entire flame surface is suppressed, so combustion noise is reduced.

(2) Since the jetting patterns of the opposing inclined air ports are shifted by half a pitch, the flames formed along the air jetting patterns are shifted by half a pitch and face each other, resulting in stable flames without collision. This creates a fold-like flame, further reducing combustion noise.

(3) The flame front formed by the inclined air has inclined air ports arranged in a zigzag pattern, so that the reaction surface does not form a large pleated flame, and the angle of inclination with respect to the flow of unburnt gas is small. Since the fuel is ejected at a certain temperature, forced mixing is promoted, the flame length is shortened, and the combustion chamber can be made smaller.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a combustion device in an embodiment of the present invention;
FIG. 2 is an enlarged top view of the main part of the burner, FIG. 3 is an enlarged perspective view of the main part of the burner, and FIG. 4 is a sectional view of a conventional combustion device. 11...Mixture chamber, 12...flame port,
17... Inclined air port, 18... Flame-holding air port, F2... Flame opposing by half a pitch. Name of agent: Patent attorney Toshio Nakao and one other person
-Energetic? A declaration I2- Flame opening part 1ri - m*+ Sky sail Flame between mouth pieces Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] A flame port consisting of a large number of flame ports from which the premix is ejected is provided on the downstream side of the mixture chamber that mixes fuel and air to form a premixture, and A large number of flame-stabilizing air ports are provided that eject air at low speed substantially parallel to the flow of the air-fuel mixture ejected from the flame port, and on the downstream side of the flame-stabilizing air port, from both sides in the longitudinal direction of the flame port, A burner is provided in which a large number of inclined air ports are arranged in a zigzag or U-shape in the longitudinal direction, and each of the opposing inclined air ports is arranged in a zigzag or U-shape. A combustion device in which zigzag or U-shaped arrays are offset by a half pitch and face each other.