JPH07103990B2 - 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. 5 and FIG. 6 show a conventional combustion device using an opposed flame.

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, 36 is a fuel passage Forked fuel supply path, 37 flame outlet, 38 combustion chamber wall, 39
Is a flame, and 40 is a frame rod provided at the end of the 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 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 serves as the secondary air supply chamber 45, and the secondary air is supplied from the secondary air supply port 46 to the combustion chamber. Gushing upwards.

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 when 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, even in the above-described configuration, at both end portions of the combustion chamber where the temperature is relatively low, the flame is blown off compared to the central portion although it is significantly better than the conventional burner. There is a problem that although it is easy to occur, CO is generated at both ends, although it burns well in the center part, but it can not be done although the combustion width can be increased a little more. Further, the frame rod 40 for detecting the change of the combustion state earliest is opposed to the flame mouth at the end where flame blow-off easily occurs,
Due to the instability of the flame, a sufficient flame current could not be secured, and there was instability in the combustion inspection performance especially during weak combustion.

The present invention has been eliminated in view of the above points, and it is an object of the present invention to increase the combustion width and obtain a sufficient flame current.

Means for Solving the Problems In order to achieve the above object, the present invention is arranged such that two surfaces of a combustion chamber wall having a large number of flame ports face each other and the flame ports are opposed to each other, and Is connected to the fuel passage arranged outside the combustion chamber wall through the fuel supply passage, and one of the facing surfaces between the combustion chamber walls arranged facing each other is closed by a side plate, and the other is A long and narrow combustion chamber is formed by fixing with a mixing chamber body that connects the carburetor and the fuel passage, and an ignition electrode is arranged at the most upstream end of this combustion chamber and at the flame outlet at the most downstream end. The flame rods are arranged facing each other, and the flame openings at both ends of the combustion chamber are enlarged so that the opening area of the flame opening facing the frame rod is larger than the opening area of other flame openings. It is a thing.

Action The present invention has the above-mentioned configuration, whereby the combustion amount at both ends of the combustion chamber increases and the temperature rises, and as a result, the flame becomes stable, so that the amount of CO generated is reduced correspondingly and the combustion width can be expanded, and the flame A sufficient current can be obtained, and reliable combustion detection can be performed even during weak combustion. Moreover, since the flame on the most downstream side of the combustion chamber farthest from the ignition electrode is detected, this can be detected when the ignition flame does not transfer to the end of the long thin combustion chamber and is partly burned. It will be detected reliably, and the safety will be improved.

Example A combustion apparatus according to an example of the present invention will be described below with reference to FIGS.
It will be described with reference to the drawings.

In the figure, 1 is a vaporizer for vaporizing liquid fuel, and 2 is a fuel nozzle for ejecting liquid fuel to the vaporizer 1, which communicates with a pump. 3 is a carburetor for the combustion air from the blower 1
Is an air passage leading to the inlet of the carburetor 1 together with the fuel nozzle 2. 4 is a mixture provided at the outlet of the carburetor 1 and communicates with the fuel passages 5 on both sides. Fuel passage 5
A large number of fuel supply passages 6 are branched from the above, 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 to form an elongated combustion chamber 8. And the combustion chamber 8
The flame openings 9a located at both ends of the open area have larger opening areas than the other flame openings 9. 10 is the flame formed at the flame mouth 9,
The flames 10 from both sides are facing each other. In addition, the fuel passage 5,
The fuel supply path 6 and the combustion chamber wall 7 are formed by a burner body 11 formed by bending one sheet metal, and a plurality of the burner bodies 11 are connected to each other to form a combustion section. Reference numeral 12 denotes a side plate which fixes the burner body 11 and the vaporizer 1 on the opposite side of the main mixing chamber body 4, and 13 denotes a secondary air supply pipe, which allows secondary air to flow in the space between the burner bodies 11. Has become. Reference numeral 14 is a mixing chamber substrate in which the burner body 11 and the vaporizer 1 are fixed on the mixing chamber body 4 side, and has a through hole 15 in the substantially central portion. 16 is an ignition flame port provided on the most upstream side of the combustion chamber 8, 17 is an ignition electrode provided so that its tip is opposed to the ignition flame port 16, and 18 is an ignition electrode of the combustion chamber 8 on the side opposite to the ignition electrode 17. A frame rod provided on the downstream side is arranged so as to face the flame port 9a having a large opening area. In the figure, 19 is a heater embedded in the carburetor 1, 20 is a burner cover that covers the outside of the burner body 11, and the space between the burner bodies is the secondary air supply chamber 21. A large number of air holes 22 for ejecting secondary air are formed in the.

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

First, the heater 19 is energized to heat the vaporizer 1. When the vaporizer 1 reaches a predetermined temperature, the blower is operated and the combustion air is sent to the vaporizer 1 through the air passage 3. In addition, the pump also operates, and the fuel flows from the fuel nozzle 2 to the vaporizer 1
Gush out inside. Since the vaporizer 1 is at a temperature at which the liquid fuel vaporizes, the fuel is vaporized and mixed with the combustion air as shown by the broken line arrow in FIG. 1 and introduced into the mixing chamber body 4 from the outlet of the vaporizer 1. Get burned. The fuel and air in the mixing chamber body 4 become a uniformly mixed mixture and flow into the fuel passage 5 as shown by the solid line arrow in FIG. At the same time a flame mouth for ignition
It also flows to 16. The air-fuel mixture ejected from the ignition flame port 16 into the combustion chamber 8 is ignited by the discharge from the ignition electrode 17 to form a flame. On the other hand, the air-fuel mixture flowing into the fuel passage 5 sequentially flows out from the side of the multiple fuel supply passages 6 near the mixing chamber body 4, and is jetted into the combustion chamber 8 from the multiple flame openings 9 located on the combustion chamber wall 7. At this time, since the flames 9 on the side closer to the mixing chamber 4 are sequentially ejected, the flame first propagates from the flame formed on the flame 16 for ignition, and then from the flame on the upstream side to the flame on the downstream side (first Flame is formed from right to left in Fig. 1. The formation of this flame takes place at the combustion chamber walls 17 on both sides facing each other almost at the same time.
As a result, a large number of flames facing each other are formed, and thereafter, the combustion continues stably.

Here, the flame formed at both ends of the combustion chamber 8 has a flame port 9a.
Is larger than the other flame ports 9, so a large flame is generated, and the temperatures at both ends are higher than those of the conventional one. As a result, the flames formed at both ends become stable due to the above temperature rise, and the generation of CO due to blow-off and the like is extremely reduced. Further, the flame current detected by the flame rod 18 also becomes large due to the increase in temperature and the increase in the flame volume, and a sufficient flame current can be obtained even during weak combustion. Also, since only the flame openings 9a at both ends are enlarged among the flame openings 9, it is possible to increase the size of the flame openings 9 in the central area, which originally has a high temperature, by increasing the area of the flame openings 9a. Stable combustion can be obtained in the entire combustion chamber without easily generating a fire.

Further, as described above, in this combustion device, the flame formed in the ignition flame port 16 moves to the downstream side one after another, and the flame is formed in the entire combustion chamber.At this time, however, the flame propagates to the most downstream. Even if the flame formation ends in the middle without doing so, the flame rod 18 is provided on the most downstream side of the combustion chamber 8 so that the flame rod 18 can be reliably inspected. Therefore, it is possible to reliably prevent the formation of the flame from remaining in a part of the combustion chamber 8 and the air-fuel mixture continuously flowing out.

In addition, although the above-described embodiment is a combustion apparatus using a liquid fuel, a gas fuel may be used, and in that case, the vaporizer 1 is a simple 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 combustion at both ends of the combustion chamber can be stabilized and the combustion width can be expanded by that amount, and the flame current can be sufficiently increased. Since it can be secured, accurate combustion can be detected. In addition, in this combustion apparatus, even if the flame is formed only in a part of the combustion chamber due to insufficient transfer of the ignition flame, this can be reliably detected and the safety is improved.

[Brief description of drawings]

FIG. 1 is a side sectional view of a combustion apparatus according to an embodiment of the present invention, FIG. 2 is a sectional view seen from the same top surface, FIG. 3 is a perspective view in which the same portion is cut, and FIG. 4 is a perspective view of the same. 5 is a side sectional view of a conventional combustion device, and FIG. 6 is a longitudinal sectional view of the same. 4 ... Mixing chamber body, 5 ... Fuel passage, 6 ... Fuel supply passage,
7 ... Combustion chamber wall, 8 ... Combustion chamber, 9,9a ... Flame tip, 17 ...
Ignition electrode, 18 ... Flame rod.

Claims (1)

[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 the aforesaid flame openings are provided on the combustion chamber wall through a fuel supply passage. Mixing that communicates with a fuel passage arranged outside, closes one of facing surfaces between the combustion chamber walls arranged facing each other with a side plate, and connects the other with a carburetor and the fuel passage. A long and narrow combustion chamber is formed by fixing with a chamber body, an ignition electrode is arranged at the most upstream side end of this combustion chamber, and a frame rod is arranged so as to face the flame mouth at the most downstream side end, and A combustion apparatus in which the flame openings at both ends of the combustion chamber are made larger so that the opening area of the flame opening facing the frame rod is larger than the opening area of other flame openings.