JPH0210009A - Combustion apparatus - Google Patents

Abstract

PURPOSE:To produce a compact combustion device, and to reduce combustion noise by providing pilot flame air plates from which air spouts to form pilot flames, and arranging slant air holes in zigzag through which air is blown out to form a flame surface. CONSTITUTION:A mixing chamber 11 and a flame hole plates 12 are furnished in the middle, and an air chamber 13 for slant air and a pair of air chamber 14, that are for pilot flame air and connected to the air compartment 13 through flow restriction orifices 15, are furnished along the both sides of the flame hole plates 12 in the longitudinal direction. Inclined air plates 17 and pilot flame air plates 18, that have air hole facing a combustion chamber 16, are respectively furnished on the air chambers 13 and 14. The pilot flame air plates 18 having pilot flame air holes 18a are located on the downstream side, and the inclined air plates 17 having inclined air holes 17a are furnished so as to spout air crossing the spouting direction of the mixed gas. Thereby, the combustion noise is reduced because the velocity distribution of the mixed gas blown out from the flame hole plates 122 is made uniform before it reaches the pilot flame air plates 18, and turbulent is mitigated. In addition, the arrangement of the slant air holes 17a helps air to be forcedly mixed with unburned gas causing the flame length to be shortened, so that the combustion device is allowed to be formed into compact size.

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 combustion equipment for household use, etc.

2. Description of the Related Art Conventionally, this type of combustion apparatus has a configuration as shown in FIG. In FIG. 3, 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 thereof. 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 burner port 2 and has an angle of intersection with the premixed mixture ejected from the burner port 2, and the air port 8 is provided substantially parallel to the burner port 2 on the same plane. It is being The combustion chamber 6 is surrounded by a heat exchange drum 9 and on the downstream side by heat exchange fins 1o.

The premixed gas ejected from the flame port 2 is supplied to the combustion chamber 6. On the other hand, the secondary air first enters the air chamber 3, and a portion thereof is controlled to a predetermined flow rate by the control plate 5 and enters the air chamber 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 F1'.

In addition, the remaining secondary air in the air chamber 3 passes through the air lower and is supplied into the combustion chamber 6 at an angle of intersection with the jetting direction of the premixture, where it is forcibly mixed with unburnt residue to form a flame F2 with a small flame length. Form. The combustion gas that has completed the combustion reaction exchanges heat with the heat exchanger tram 9 and the fins 10, and then is released into the outside air. (For example, Japanese Patent Publication No. 58-75771
However, in the above configuration, since the flame stabilizing air jet port 8 and the flame port part 2 are located close to each other on the same plane, the air-fuel mixture ejected from the flame port part The non-uniformity of the flow velocity distribution and the turbulence of the flow directly affect the stability of the flame-holding flame, making it impossible to consistently form a stable flame-holding flame and creating problems in reducing combustion noise. had.

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

In order to solve the second problem, the combustion device of the present invention has a mixture chamber that mixes fuel and air to create a premixture, and a premixture chamber located downstream of the mixture chamber. A burner port consisting of a large number of ejecting burner ports, and a burner provided on both longitudinal sides of the downstream side of the burner port,
An inclined air plate having a large number of zigzag or U-shaped inclined air ports which blow out air crossing the direction of the air-fuel mixture ejected from the flame port, and an inclined air plate on the upstream side of the inclined air plate, and Combustion comprising a flame stabilizing air plate having flame stabilizing air ports provided on both longitudinal sides of the downstream side of the flame port and ejecting air parallel to the jetting direction of the air-fuel mixture ejected from the flame port. It consists of a combustion chamber and a heat exchange section provided downstream of the combustion chamber.

Effect of the present invention With the above-described configuration, a flame-stabilizing flame is formed by the flame-stabilizing air jetted from the flame-stabilizing air port of the flame-stabilizing air plate provided on the downstream side of the flame spout. The air-fuel mixture has a uniform flow velocity distribution in the section until it reaches the flame-holding air plate on the downstream side, and the turbulence of the flow is alleviated.
A flame-holding flame is a stable steady flame.

In addition, the flame front formed by the inclined air has a zigzag arrangement of inclined air ports, so the reaction surface becomes a large pleated flame, and the inclined air ejects at an angle of intersection with the flow of gas. , the combustion reaction with unused gas is promoted and the flame length can be shortened.

Embodiments Hereinafter, embodiments of the present invention will be described based on 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-holding air are provided with an inclined drying plate 17 and a flame-holding air plate 18 having air ports extending into the combustion chamber 16, respectively. Here, the flame stabilizing air plate 18 having the flame stabilizing air ports 18 a is provided downstream of the flame port portion 12 . The inclined air plate 17 having the inclined air port 17a is
It is provided so as to eject inclined air intersecting with the ejection direction of the air-fuel mixture ejected from the flame port 12. 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 air-fuel mixture ejected from the flame port 12 is supplied to the combustion chamber 16 with a uniform flow velocity distribution and less turbulence in the flow until it reaches the flame stabilizing air plate 18. 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 ejected from the flame stabilizing air plate 18 on the downstream side of the flame port 12 substantially parallel to the jetting direction of the air-fuel mixture, forming a stable flame F1.

In addition, the remaining secondary air in the air chamber 13 is transferred to the inclined air plate 1
7 and is supplied into the combustion chamber at an angle of intersection with the ejection direction of the premixture, and is forcibly mixed with unburned gas to form a flame F2 with a small flame length. 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 air-fuel mixture ejected from the flame nozzle has a uniform flow velocity distribution in the section until it reaches the flame stabilizing air plate having flame stabilizing air ports provided downstream of the flame nozzle, and the flow rate is uniform. Since the turbulence is also alleviated, the flame-holding flame becomes a steady flame,
By connecting the flame formed by the inclined air with the stable flame-holding flame, turbulence of the entire flame is suppressed, thereby reducing combustion noise and making it possible to reduce the noise of the apparatus.

(2) The flame front formed by the inclined air is 1. Since the inclined air ports are arranged in a zigzag or U-shape,
Since the reaction surface becomes a large pleat-like flame and is ejected at an angle of intersection with the flow of pre-gas, 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 perspective view of essential parts of the combustion device, and FIG. 3 is a sectional view of the conventional combustion device. 11...Mixture chamber, 12...flame port,
17... Inclined air plate, 17a... Inclined air port, 18... Flame holding air plate, 18a...
...Flame holding air port, F... Flame holding flame.

Claims (1)

[Claims] A mixture chamber that mixes fuel and air to create a premixture; a flame port portion located downstream of the mixture chamber that includes a number of flame ports from which the premixture is jetted; and a longitudinal length of the downstream side of the flame port portion. an inclined air plate having a large number of zigzag or U-shaped inclined air ports provided on both sides of the direction and blowing out air crossing the blowing direction of the air-fuel mixture ejected from the flame port; Flame stabilizing air having flame stabilizing air ports provided on both sides in the longitudinal direction on the upstream side of the air plate and on the downstream side of the flame port and ejecting air parallel to the jetting direction of the air-fuel mixture ejected from the flame port. A combustion device comprising a combustion chamber including a flame holding plate, a flame holding air plate, an inclined air plate, and a flame port, and a heat exchanger provided on the downstream side of the combustion chamber.