JPH02169906A - Burning apparatus - Google Patents

Abstract

PURPOSE:To maintain a uniform burning condition over the entire area by setting the distance between the flame holes greater in the central part than in the other part in the first burning apparatus, and setting the opening for the secondary air supply greater in the central part than in the other part in the second burning apparatus. CONSTITUTION:The distance l1 between the flame holes 9a in nearly the central part is set greater than the distance l2 between the flame holes 9b in the other part in the first burning apparatus, and so, the sizing of the waste gas discharge passage of the flame holes 9a is greater than that of the flame holes 9b. Therefore, the secondary flame 20a in nearly the central part becomes shorter than in the case of the distance l2, and becomes uniform as a whole. In the second burning apparatus, the flame holes 9 are set at regular intervals, and the opening for the secondary air supply 17 is made greater in nearly the central part than the other opening for the secondary air supply 17b. Therefore, the quantity of secondary air from the secondary air supply opening 17a becomes greater that that from the secondary air supply opening 17b. As a result, the secondary flame 20a in nearly the central part becomes shorter, and so, the secondary flame 20a becomes uniform as a whole to maintain a uniform burning condition.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to a combustion device for domestic or commercial use, such as a heating appliance.

BACKGROUND OF THE INVENTION In recent years, efforts have been made to expand the variable range of the combustion amount of combustion devices while improving the exhaust gas characteristics. As a means of achieving this, we have succeeded in greatly improving the above characteristics by using a combustion device in which a large number of flame ports are placed facing each other.

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

FIGS. 9 to 13 show conventional combustion devices using opposed flames.

31 is a fuel nozzle that spouts fuel; 32 is a vaporizer tube that vaporizes fuel; 33 is a heater that heats the vaporizer tube; 34 is a mixing chamber that mixes vaporized fuel and air; 35 is a fuel passage;
6 is a fuel supply path branched from the fuel passage, 37 is a flame port, 3
8 is a combustion chamber wall, 39 is a flame, and 40 is a combustion chamber. 41
42 is a side plate opposite to the mixing chamber 34, and 42 is a secondary air supply pipe through which secondary air flows through a through hole 43 formed in the side plate 41. Reference numeral 44 denotes a burner cover that covers the outside of the fuel passage 35. The space between the burner cover 44 and the fuel passage 35 is used as a secondary air supply chamber 45, and the secondary air is supplied from the secondary air supply port 46 to the combustion chamber. 40 is erupting upwards.

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

First, the heater 33 is energized and when the vaporization tube 32 reaches a predetermined temperature, combustion air and liquid fuel are sent into the vaporization tube 32, and the liquid fuel is vaporized by the vaporization tube 32 and mixed while being mixed with air. The air is sent to the chamber 34, and the air and vaporized fuel are sufficiently mixed within the mixing chamber 34.

The mixed air-fuel mixture passes through the fuel passage 35 and reaches the flame port 37 from a number of fuel supply passages 36 . When the air-fuel mixture ejected from the flame port 37 is ignited, a flame 39 is formed. Here, since the flame ports 37 are provided facing each other,
The flames 39 are formed facing each other as shown in FIG. As a result, even when the amount of air increases or the amount of combustion is large, flame blow-off becomes extremely difficult to occur, and the variable range of the amount of air and the amount of combustion becomes wider.

Problems to be Solved by the Invention However, with the above configuration, if the amount of air decreases for some reason or the amount of combustion increases,
As shown in FIG. 10, the secondary flame 47 appears above the combustion chamber 40, and the secondary flame 47a at the center is formed to extend long. As a result, when yellow flame begins to appear in the secondary flame 47, the secondary flame 47a in the center causes incomplete combustion earlier than the other secondary flames 47b, causing safety problems such as generation of soot and CO. It was. Therefore, when looking at the combustion device as a whole, the original combustion range has been diminished accordingly.

The present invention was made in view of the above problems, and by eliminating the elongation of the secondary flame in the center and maintaining a uniform combustion state throughout, the generation of soot, CO, etc. This eliminates safety issues and realizes the wide variable range of combustion inherent to opposing flames.

Means for Solving the Problems In order to solve the above-mentioned problems, the first combustion device of the present invention has a flame port located approximately at the center, and a distance between the flame ports and the other flame ports. are arranged so that the distance between them is greater than the distance between
The second combustion device covers the outside of the fuel passage with a burner cover and uses the space between the combustion chamber wall and the burner cover as a secondary air supply chamber, and the combustion chamber is supplied through the secondary air supply chamber. The secondary air supply port is arranged so as to supply secondary air from above, and the opening of the secondary air supply port approximately in the center is made larger than the openings of the other secondary air supply ports. .

Function In the combustion device of the present invention, first, in the first combustion device, the flame port in the approximately central portion is sparser than the other flame ports, and the exhaust gas outlet path is made thicker. becomes shorter.

Furthermore, in the second combustion device, since the opening of the secondary air supply port in the approximately central portion is larger than the opening V of the other secondary air supply ports,
The amount of secondary air coming from approximately the center is larger than other parts,
The combustion reaction is promoted and the secondary flame approximately in the center becomes shorter. Therefore, when viewed as a whole, the secondary flame becomes uniform, resulting in a uniform combustion state.

As a result, safety problems such as the generation of soot and CO are eliminated, and it is possible to realize the combustion amount without impairing the wide variable range of the combustion amount inherent to the opposing flames.

Furthermore, in the second combustion device, since the number of secondary air units can be increased approximately at the center, it is possible to cool the central area, where the temperature is highest at the secondary air supply port, and to avoid durability problems such as thermal deformation. It disappears.

Embodiment Hereinafter, one embodiment of the present invention will be described based on the accompanying drawings. In FIGS. 1 to 5, reference numeral 1 denotes a vaporization cylinder for vaporizing liquid fuel, and numeral 2 denotes a fuel nozzle for jetting liquid fuel into the vaporization cylinder 1, which communicates with a pump. Reference numeral 3 denotes an air passageway that guides 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 carburetor cylinder 1 and communicates with 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, forming 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 denotes a flame formed at the flame outlet 9, and flames 10 from both sides are opposed to each other. Further, the fuel passage 5, the fuel supply passage 6, and the combustion chamber wall 7 are formed by a burner body 11 formed by bending a sheet metal, and a plurality of burner bodies 11 are connected together. 12 is a side plate fixing the burner body 11 and the vaporizing cylinder 1 on the opposite side of the mixing chamber 4; 13;
A secondary air supply pipe is configured to flow secondary air into the space between the burner bodies 11 through a through hole 14 formed in the side vi12. Reference numeral 15 denotes a burner cover that covers the outside of the fuel passage 5 of the burner body 11, and the space between the burner bodies is used as a secondary air supply chamber 16.

A number of secondary air supply ports 17 supply secondary air from above the combustion chamber 8 . Note that 18 is an ignition lever that ignites the air-fuel mixture, and 19 is a heater embedded in the carburetor cylinder l.

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

First, the heater 19 is energized to heat the vaporizer cylinder l.

When the vaporizer cylinder l reaches a predetermined temperature, the blower is operated,
Combustion air is sent to the vaporizer cylinder 1 through the air passage 3. The pump also operates, and fuel is injected from the fuel nozzle 2 into the vaporization Wal. Vaporization? Since J1 is at a temperature at which the liquid fuel vaporizes, the fuel is vaporized and guided from the outlet of the vaporization cylinder 1 to the mixing chamber 4 while being mixed with the combustion air as shown 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 arrow in FIG. Further, the mixture advances from the fuel passage 5 to a fuel supply passage 6 which is branched into many branches, and when the mixture coming out of the opening of the fuel supply passage 6, that is, the flame port 9, is ignited by the ignition electrode 18, a flame 10 is formed and combustion occurs. Continue. At this time, radiation from the flame 10 heats the combustion chamber wall 7 as well as the vaporizer cylinder 1, making it 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 is
As shown by the solid arrow in the figure, the air passes through the secondary air supply chamber 16 and is ejected from the secondary air supply port 17 for combustion.

Here, if the amount of air decreases for some reason or if the amount of combustion increases, the secondary flame 20 is formed above the combustion chamber 8. In this embodiment, as is clear from FIG. The flame outlet 9a of the part is the distance between the flame outlet and the flame outlet @1. are arranged so that they are larger than the distance Mi8 between the other burner ports 9b, so that the burner port 9a in the approximately central portion is closer to the other burner ports 9.
It is in a sparse state than b, and the exhaust gas outflow path is larger.

Therefore, the secondary flame 20a at the approximately central portion is shorter than in the case of the distance it between flame ports, and the secondary flame 20 becomes uniform overall, resulting in a uniform combustion state. As a result, even if yellow flame begins to appear in the secondary flame 20, the secondary flame 20a in the approximately center area where the secondary flame 20 tends to spread even in normal amounts will not cause incomplete combustion earlier than the other secondary flames 20b ( generation of soot, CO
Safety problems such as the occurrence of flames are eliminated, and a wide range of variation in the amount of combustion inherent to opposing flames can be realized.

Next, another combustion device of the present invention will be explained based on FIG. 6. In this combustion device, the flame ports 9 are arranged at equal intervals,
The secondary air supply port 17 is a secondary air supply port located approximately in the center! ?
The opening of the secondary air supply port 17b is formed to be larger than the opening of the other secondary air supply port 17b.

Therefore, the amount of secondary air from the secondary air supply port 17a located approximately at the center becomes larger than the amount of secondary air from the other secondary air supply ports 17b, and the combustion reaction is promoted.
The secondary flame 20a at the substantially central portion becomes shorter, and the secondary flame 20 becomes uniform overall, resulting in a uniform combustion state.

As a result, the same effects as in the above-mentioned embodiments are obtained, safety problems such as soot generation and CO generation are eliminated, and a wide variable range of the combustion amount inherent to the opposing flames can be realized. Furthermore, with this configuration, it is possible to increase the amount of secondary air in the approximately central area, which makes it possible to cool the central area, which is at the highest temperature (where the secondary air supply port 17 is located), thereby reducing durability such as thermal deformation. Problems can also be resolved.

In addition, in this embodiment, the secondary air supply port 17a located approximately in the center
The opening of the secondary air supply port 17a was changed depending on the size of the secondary air supply port 17a, but as shown in FIG.
A similar effect can be obtained by making 7a denser than other parts.

Further, as shown in FIG. 8, the same effect can be obtained by forming the secondary air supply port 17 as a single slit-shaped opening and making the opening of the secondary air supply port 17a in the approximately central portion larger. .

Although the above-described embodiment is a combustion device using liquid fuel, it may also be a combustion device using gaseous fuel, in which case the vaporization tube 1 becomes a mere mixing tube.

Effects of the Invention As is clear from the above description of the embodiments, according to the combustion apparatus of the present invention, the secondary flame in the approximately central portion is shorter than the conventional one (and is uniform throughout, reducing the generation of soot and CO2). This eliminates safety problems such as the occurrence of flames, and provides a wide variable range for the amount of combustion inherent to opposing flames.

In addition, in the second combustion device, the amount of secondary air can be increased in the approximately central part, which makes it possible to cool the central part where the temperature is highest in the secondary air supply section y, thereby reducing durability such as thermal deformation. Problems can also be resolved.

[Brief explanation of the drawing]

FIG. 1 is an overall perspective view of a combustion device according to an embodiment of the present invention, FIG. 2 is a sectional view taken along line AA' in FIG. 1, FIG. 3 is a sectional view taken along line BB' in FIG. The figure is a sectional view taken along line c-c' in Fig. 2, Fig. 5 is a sectional view DD'' in Fig. 2, Figs. 6 to 8 are sectional views showing other embodiments, and Fig. 9 is a conventional FIG. 10 is a sectional view taken along line AA' in FIG. 9, and FIG.
12 is a sectional view taken along line BB' in FIG. 10, FIG. 12 is a sectional view taken along line cc' in FIG. 10, and FIG. 13 is a sectional view taken along line DD' in FIG. 10. 5... Fuel passage, 6... Fuel supply path,
7... Combustion chamber wall, 9... Flame vent, 15.
... Burner cover, 16 ... Secondary air supply chamber, 17 ... Secondary air supply port. Name of agent Patent attorney Shigetaka Awano 1 person Figure 5-Tsunajika Tsuhoginto 7-・-M derogatory heron ν・-Ryo a/7 =-Two pigs f1 Kikenshu 0! 11111!1 7- Combustion 11i tatami? -・Zangkou I7...-211 Whistle! i10 near hno 3 figure

Claims (2)

[Claims] (1) Two combustion chamber walls having a large number of flame ports are arranged so as to face each other, and the flame ports are arranged to face each other, and each flame port is arranged outside the combustion chamber wall via a fuel supply path. The combustion device is arranged such that the flame ports in the substantially central part communicate with the fuel passages, and the distance between the flame ports is larger than the distance between the other burner ports. (2) Two combustion chamber walls having a large number of flame ports are arranged so as to face each other, and the flame ports are arranged so as to face each other, and each flame port is arranged outside the combustion chamber wall via a fuel supply path. The outside of the fuel passage is covered with a burner cover, and the space between the combustion chamber wall and the burner cover is used as a secondary air supply chamber, and the combustion is carried out through the secondary air supply chamber. A secondary air supply port is arranged to supply secondary air from above the room, and
A combustion device in which the opening of the secondary air supply port located approximately in the center is larger than the openings of the other secondary air supply ports.