JPH0621683B2 - Combustion device - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a domestic or commercial combustion device such as a heating appliance.

2. Description of the Related Art In recent years, in combustion devices, efforts have been made to expand the variable range of the combustion amount while improving the exhaust gas characteristics. As one of the means, we have succeeded in greatly improving the above characteristics by using a combustion device in which a large number of flame nozzles face each other.

An example of the above-described combustion device will be described below with reference to the drawings.

FIG. 9 to FIG. 13 show a conventional combustion device using an opposed flame.

Reference numeral 31 is a fuel nozzle for ejecting fuel, 32 is a vaporizing cylinder for vaporizing the fuel, 33 is a heater for heating the vaporizing cylinder, 34 is a mixing chamber for mixing vaporized fuel and air, 35 is a fuel passage, and 36 is a fuel passage. Forked fuel supply path, 37 flame outlet, 38 combustion chamber wall, 39
Is a flame and 40 is a combustion chamber. 41 is a side plate on the opposite side of the mixing chamber 34, 42 is a secondary air supply pipe, and the secondary air is allowed to flow through a through hole 43 formed in the side plate 41. Reference numeral 44 is a burner cover that covers the outside of the fuel passage 35.
A space between and is defined as a secondary air supply chamber 45, and the secondary air is jetted above the combustion chamber 40 from the secondary air supply port 46.

The operation of the combustion device configured as described above will be described below.

First, when the heater 33 is energized and the vaporization cylinder 32 reaches a predetermined temperature, combustion air and liquid fuel are sent into the vaporization cylinder 32,
The liquid fuel is vaporized by the vaporization cylinder 32 and is sent to the mixing chamber 34 while being mixed with air, and the air and the vaporized fuel are sufficiently mixed in the mixing chamber 34. The mixed air-fuel mixture passes through the fuel passage 35 and reaches the flame port 37 from the multiple fuel supply passages 36. When the air-fuel mixture ejected from the flame outlet 37 is ignited, a flame 39 is formed. Since the flame openings 37 are provided so as to face each other, the flame 39 is formed so as to face each other as shown in FIG. As a result, even if the amount of air is increased or the amount of combustion is large, it is very difficult for the flame to blow off, and the variable range of the amount of air and the amount of combustion is widened.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the configuration as described above, when the air amount decreases for some reason or when the combustion amount increases,
A secondary flame 47 appears above the combustion chamber 40 as shown in FIG.
The secondary flame 47a in the central portion is formed to extend long. As a result, when a yellow flame begins to appear on the secondary flame 47, the secondary flame 47 in the central portion
In the case of a, incomplete combustion occurs earlier than the other secondary flame 47b, and safety problems such as soot generation and CO generation occur.
Therefore, when viewed as a whole of the combustion apparatus, the original breadth of the combustion range is impaired to that extent.

The present invention has been made in view of the above problems, and it is possible to prevent the secondary flame in the central portion from extending for a long time so as to maintain a uniform combustion state throughout, so that the safety of soot generation, CO generation, etc. This eliminates the problem of sexuality and realizes a wide range of combustion that is the original range of opposed flames.

Means for Solving the Problems In order to solve the above problems, the first combustion device of the present invention forms a flame port by arranging a plurality of flame port rows formed by arranging in a horizontal row in the vertical direction. In addition, the flame openings at the approximate center of the flame opening array are arranged such that the distance between the flame openings is larger than the distance between the flame openings on both sides. The combustion device covers the outside of the fuel passage with a burner cover to form a space between the combustion chamber wall and the burner cover as a secondary air supply chamber. The secondary air supply port is arranged to supply the secondary air, and the opening of the secondary air supply port at the substantially central portion is made larger than the openings of the other secondary air supply ports.

In the combustion apparatus of the present invention, first, in the first combustion apparatus, the flame outlet in the substantially central portion is in a state of being sparser than the other flame outlets, and the exhaust gas outflow passage can be made large, so that the secondary flame in the central portion is short. Become.

Further, in the second combustion device, since the opening of the secondary air supply port at the substantially central portion is larger than the openings of the other secondary air supply ports, the amount of secondary air from the substantially central portion is larger than that at other portions. Then, the combustion reaction is accelerated and the secondary flame in the substantially central portion is shortened. Therefore, as a whole, the secondary flame becomes uniform and a uniform combustion state is achieved.

As a result, safety problems such as soot generation and CO generation are eliminated, and it can be realized without impairing the range of the variable range of the original combustion amount of the opposing flame.

Further, in the second combustion device, since the amount of secondary air in the substantially central portion can be increased, the central portion having the highest temperature in the secondary air supply port can be cooled, and durability problems such as thermal deformation also occur. Disappear.

Embodiment One embodiment of the present invention will be described below with reference to the accompanying drawings. In FIGS. 1 to 5, 1 is a vaporization tube for vaporizing liquid fuel, 2 is a fuel nozzle for ejecting the liquid fuel into the vaporization tube 1, which is in communication with a pump. Reference numeral 3 denotes an air passage for guiding the combustion air from the blower to the vaporization cylinder 1, which opens at the inlet of the vaporization cylinder 1 together with the combustion nozzle 2. A mixing chamber 4 is provided at the outlet of the vaporization cylinder 1 and communicates with the fuel passages 5 on both sides. A large number of fuel supply passages 6 are branched from the fuel passage 5, and the other end of the fuel supply passage 6 penetrates the combustion chamber wall 7 and opens into the combustion chamber 8 to form a flame port 9. Here, the two combustion chamber walls 7 face each other, and the flame ports 9 are provided at positions facing each other. Reference numeral 10 is a flame formed in the flame port 9, and the flames 10 from both sides face each other. Further, the fuel passage 5, the fuel supply passage 6, the combustion chamber wall 7 and the flame port 9 are formed by a burner body 11 formed by bending one sheet metal, and a plurality of burner bodies 11 are vertically connected. The flame ports 9 have a configuration in which a plurality of flame port arrays formed by arranging them in a horizontal row are arranged in the vertical direction. Further, the flame ports 9a at the substantially central portion of this flame port array are arranged such that the distance l ₁ between the flame ports is larger than the distance l ₂ between the flame ports 9b on both sides. I am doing it. Reference numeral 12 is a side plate that fixes the burner body 11 and the vaporization cylinder 1 on the opposite side of the mixing chamber 4, 13 is a secondary air supply pipe, and the burner body 11 is provided between the burner bodies 11 through a through hole 14 formed in the side plate 12. Secondary air is made to flow into the space of. Reference numeral 15 is a burner cover for covering the outside of the fuel passage 5 of the burner body 11, and the space between the burner bodies serves as a secondary air supply chamber 16.

Reference numeral 17 denotes a large number of secondary air supply ports for supplying secondary air from above the combustion chamber 8. In addition, 18 is an ignition electrode for igniting the air-fuel mixture, and 19 is a heater embedded in the vaporization cylinder 1.

The operation of the combustion device configured as described above will be described below.

First, the heater 19 is energized to heat the vaporization cylinder 1. When the vaporization cylinder 1 reaches a predetermined temperature, the blower is operated and the combustion air is sent to the vaporization cylinder 1 through the air passage 3. Further, the pump also operates, and the fuel flows from the fuel nozzle 2 to the vaporization cylinder 1
Gush out inside. Since the vaporization cylinder 1 is at a temperature at which the liquid fuel vaporizes, the fuel is vaporized and introduced into the mixing chamber 4 from the outlet of the vaporization cylinder 1 while being mixed with the combustion air as indicated by the broken line arrow in FIG. In the mixing chamber 4, the fuel and air become a uniformly mixed mixture and flow into the fuel passage 5 as shown by the solid line arrow in FIG. Further, the air-fuel mixture advances from the fuel passage 5 to the fuel supply passage 6 branched into a large number, and when the ignition electrode 18 ignites the air-fuel mixture emitted from the opening of the fuel supply passage 6, that is, the flame port 9, a flame 10 is formed and burned. To continue. At this time, the vaporization cylinder 1 is heated at the same time as the combustion chamber wall 7 by the radiation from the flame 10, and it is possible to maintain a constant temperature without energizing the heater 19 during steady combustion. Further, the secondary air supplied from the secondary air supply pipe 13 passes through the secondary air supply chamber 16 and is jetted from the secondary air supply port 17 for combustion as shown by the solid arrow in FIG.

Here, when the amount of air decreases for some reason or the amount of combustion increases, the secondary flame 20 is formed above the combustion chamber 8. In this embodiment, as is clear from FIG. 2, the flame port 9a at the substantially central portion is in a sparser state than the flame ports 9b at both sides, and the exhaust gas outflow passage is large. Therefore, the secondary flame 20a at the substantially central portion becomes shorter than in the case of the distance between the flame openings l ₂ , and the secondary flame 20 becomes uniform as a whole and becomes in a uniform combustion state. As a result, even if a yellow flame begins to appear on the secondary flame 20, the secondary flame 20 is usually most likely to expand
a does not cause incomplete combustion earlier than other secondary flames 20b, safety problems such as soot generation and CO generation disappear, and a wide range of variable combustion amount of the opposing flame can be realized. .

Next, another combustion device of the present invention will be described with reference to FIG. In this combustion device, the flame ports 9 are provided at equal intervals,
The secondary air supply port 17 is formed such that the opening of the secondary air supply port 17a at the substantially central portion is larger than the openings of the other secondary air supply ports 17b. Therefore, the amount of secondary air from the secondary air supply port 17a at the substantially central portion is equal to that of the other secondary air supply port 17b.
The secondary flame 20a in the substantially central portion becomes short, and the secondary flame 20 becomes uniform as a whole, resulting in uniform combustion. It becomes a state. As a result, the same effects as those of the above-described embodiment are obtained, safety problems such as soot generation and CO generation are eliminated, and a wide variable range of the original combustion amount of the opposing flame can be realized. Further, in this configuration, since the secondary air amount in the substantially central portion can be increased, it is possible to cool the central portion having the highest temperature in the portion of the secondary air supply port 17, which causes a problem of durability such as thermal deformation. Can also be resolved.

In this embodiment, the opening of the secondary air supply port 17a at the substantially central portion is changed according to the size of the secondary air supply port 17a. However, as shown in FIG. Mouth 17a
The same effect can be obtained by making the area denser than other areas.

The same effect can be obtained by forming the secondary air supply port 17 as one slit-shaped opening as shown in FIG. 8 and enlarging the opening of the secondary air supply port 17a in the substantially central portion. .

Although the above-described embodiment is a combustion apparatus using liquid fuel, it may be one using gas fuel, in which case the vaporization cylinder 1 simply serves as a mixing tube.

EFFECTS OF THE INVENTION As is apparent from the above description of the embodiments, according to the combustion apparatus of the present invention, the secondary flame in the substantially central portion becomes shorter than the conventional one, and becomes uniform as a whole. The problem of safety such as generation is eliminated, and the range of the variable range of the combustion amount of the opposed flame main body is obtained.

Further, in the second combustion device, since the secondary air amount in the substantially central portion can be further increased, it becomes possible to cool the central portion having the highest temperature in the secondary air supply port portion, and durability of thermal deformation or the like can be improved. The problem can be solved.

[Brief description of drawings]

1 is an overall perspective view of a combustion apparatus according to an embodiment of the present invention, FIG. 2 is a sectional view taken along the line AA ′ in FIG. 1, FIG. 3 is a sectional view taken along the line BB ′ in FIG. 2, and FIG. FIG. 5 is a sectional view taken along the line CC ′ of FIG. 2, FIG. 5 is a sectional view taken along the line DD ′ of FIG. 2, and FIGS.
FIG. 9 is a sectional view showing another embodiment, FIG. 9 is an overall perspective view of a conventional combustion apparatus, FIG. 10 is a sectional view taken along the line AA 'of FIG. 9, and FIG.
FIG. 12 is a sectional view taken along the line BB 'in FIG. 10, and FIG. 12 is a sectional view taken along the line C- in FIG.
13 is a sectional view taken along the line D-D 'in FIG. 5 ... Fuel passage, 6 ... Fuel supply passage, 7 ... Combustion chamber wall,
9: Flame port, 15: Burner cover, 16: Secondary air supply chamber, 17: Secondary air supply port.

Claims (2)

[Claims] 1. A two-sided combustion chamber wall having a large number of flame openings is arranged so as to face each other and the flame openings are opposed to each other, and each flame opening is located outside a combustion chamber wall through a fuel supply passage. Is connected to the fuel passage arranged in one row, and the above-mentioned flame ports are formed by arranging the flame ports arranged in a horizontal row and arranging them in a plurality of stages in the vertical direction, and the flame ports at the substantially central portion of this flame port array. Is a combustion device arranged so that the distance between the flame openings is larger than the distance between the flame openings on both sides. 2. The two combustion chamber walls having a large number of flame openings are arranged to face each other and the flame openings are opposed to each other, and each flame opening is located outside the combustion chamber wall through a fuel supply passage. The fuel passage arranged in the above, and the outside of the fuel passage is covered with a burner cover to form a space between the combustion chamber wall and the burner cover as a secondary air supply chamber, and through this secondary air supply chamber. The secondary air supply port is arranged so that the secondary air is supplied from above the combustion chamber, and the opening of the secondary air supply port in the substantially central portion is made larger than the openings of the other secondary air supply ports. Combustion device.