JPS6217128B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a combustion device, and is intended to improve ignition characteristics and stability.

Conventionally, especially in low-primary combustion devices, the main mixing chamber and the combustion chamber basically coexist, so it is difficult to achieve uniformity due to the size and configuration of the mixing mechanism, or due to external disturbances such as refueling or air blowing conditions. It is difficult to obtain a high-quality mixed gas compared to a completely premixed combustion device, and the concentration of the mixed gas varies greatly depending on the location. Therefore, the ignition characteristics of combustion start lack stability and are dangerous. That is, in order to ensure stable ignition performance, the capacity of the igniter must be increased, the ignition mechanism must have an unreasonable configuration, and furthermore, strict dimensional regulations are required, resulting in high costs. In particular, in the conventional example shown in FIG.
5 and secondary air holes 10' (bottom row), the igniter 20 may be cooled by the secondary air, the control dimensions of the igniter 20 may be out of order, and Due to changes over time, the tip of the igniter 20 would sag, leading to deterioration in ignitability.

The present invention solves the above-mentioned conventional drawbacks, and one embodiment of the present invention will be described below with reference to the accompanying drawings.

Referring to FIG. 1, an embodiment of the present invention will be described. 1 is an air blower, 2 is an air blowing case, in which a burner body 4 with a bottom and a double cylindrical cross section and a built-in preheater 5 is mounted via a heat insulating material 3; are placed. 7 is an air regulating hole. 8 is a cylindrical burner head with multiple primary air holes 9 at the bottom.
In addition, secondary air holes 10 are formed at a distance from the primary air holes 9, and are regulated by the protrusion 4'' of the inner peripheral wall 4' of the burner body 4, with a small gap 11 between the burner body 4. The burner head side plate 14 corresponds to the burner head 8 and constitutes the upper plate of the gas chamber 17, and the burner head side plate 14 corresponds to the burner head 8 and constitutes the upper plate of the gas chamber 17.
The burner body 4 is placed on the seat 4 of the burner body 4 and its position is regulated so that a gas jet port 15 is formed near the bottom of the bottom row hole portion 10 of the burner body 4 . Here, the burner body 4 is divided into upper and lower parts by the outer peripheral walls 4', 4'', the burner head 8 and the burner head side plate 14, with the lower part of the burner head side plate 14 serving as a gas chamber 17 and the upper part serving as a combustion chamber 18. Each is configured.

Here, in particular, the above-mentioned burner head side plate 14
As shown in FIGS. 2 to 5, there are at least a single row of ignition ports 16 formed by small holes or slits so as to communicate sequentially from a part of the gas outlet 15 to the igniter 20. Said gas chamber 1
It is drilled to a position opposite to 7.

In addition, the ignition port 16 is designed to improve and stabilize ignition characteristics, and maintain stable combustion characteristics after ignition.
The hole diameter and slit width of the ignition port 16 are set to be equal to or smaller than the gap width of the gas jet port 15, and the number of rows is plural, and the arrangement is such that the igniter is directed toward the gas jet port 15. It is effective to form a V-shape with 20 as the base point and widening towards the end. Furthermore, if the portion of the ignition port 16 facing the combustion chamber 18 has a counterbore configuration, the gas ejection speed is reduced and the ignitability is improved. Moreover, the position of the igniter 20 with respect to the ignition ports 16 is such that it faces the center of the ignition ports when the ignition ports 16 are in a single row. Further, when the ignition ports 16 are arranged in a plurality of rows, it is preferable to locate the ignition ports 16 and 15 at an intermediate portion. Reference numeral 12 denotes a rectifier plate located in the gas chamber 17 between the primary air hole 9 and the burner head side plate 14, with one side fixed to the outer peripheral surface of the burner head 8, and the other side fixed to the inner surface of the outer peripheral wall 4'' of the burner body 4. The gap 13 is configured such that a small gap 13' in a portion facing the ignition port 16 has a larger opening area than other portions, increasing the amount of gas ejected from the ignition port 16. In addition, the mixed gas in the gas chamber 17 of the low primary combustion device, which is the premise of this embodiment, is below the explosion limit of the supplied fuel gas. Air hole 9
It is desirable that the specifications of the system be adjusted and regulated. That is, if the amount of primary air is increased beyond the explosion limit, flashback to the gas chamber 17 will occur due to disturbance conditions, so this is basically to be avoided. 19 is a fuel pipe for liquid fuel or gaseous fuel, and 19' is a heat insulator for the fuel pipe 19. 21 is a temperature sensor,
This is to control the temperature of the preheater 5 and to maintain the burner body 4 at a good vaporization temperature at all times, and is not necessary in the case of gaseous fuel. 22 is an ignition flame, and 23 is a combustion flame.

The operation of the above configuration will be explained according to the drawings. First, the preheater 5 is energized via the temperature sensor 21 to raise the temperature of the entire burner body 4 to the gas temperature, and at this point, the blower 1 blows combustion air, and the fuel pipe 19
When a predetermined amount of liquid fuel is supplied into each gas chamber 17, the liquid fuel receives heat at the bottom of the gas chamber 17, vaporizes and expands, and becomes vaporized gas. The primary air is received through the air hole 9 and becomes a rich mixed gas, which then enters the gas chamber 17.
Flow fills the entire area. A part of the mixed gas passes through the rectifier plate 12, gaps 13 and 13', and reaches the gas outlet 1.
5 and ignition port 16 toward the combustion chamber 18, respectively. In particular, prior to ignition, the mixed gas from the ignition port 16 receives air from the secondary air hole 10 and becomes a mixed gas that is easily ignited. At this time, for example, when a high voltage is applied to the igniter 20, a spark is emitted at the tip of the igniter 20, which ignites the mixed gas ejected from the ignition port 16, and the mixed gas ejects from the chain-shaped ignition port 16. The gas sequentially ignites in the direction of the gas outlet 15, forming an ignition flame 22, and on the other hand, a large amount of other dense mixed gas is squeezed at the gas outlet 15 and ejected in the form of a thin film. Since the secondary air is ejected in the form of countless needles from all the secondary air holes 10 of the burner head 8, a large amount of dense mixed gas is diffused and mixed at high speed and finely divided into a homogeneous mixed gas that is combustible. become. Therefore, since the ignition flame 22 serves as a stable ignition source, the mixed gas instantaneously forms the combustion main flame 23, resulting in complete combustion of clean blue flame. When the main combustion flame 23 is formed, part of the combustion heat is absorbed by the outer peripheral wall 4'' of the burner body 4, and the necessary vaporization heat within the burner body 4 can be sufficiently compensated for by combustion.
Therefore, the power supply to the preheater 5 is normally unnecessary, and the temperature sensor 21 cuts off the power supply and controls the power supply.

When extinguishing a fire, the fuel from the fuel pipe 19 is cut off using a functional component (not shown) such as a valve, and the fire is instantly extinguished.

In particular, regarding ignition, the gas body of this type of burner is basically under the condition that a mixed gas within the explosive limit will not ignite, but the ignition ports 16 are arranged in a chained row,
Also, the lower part of the secondary air hole 10 is in communication with the gas outlet 15, and the lower part of the secondary air hole 10 is connected to the burner body 4.
facing the outer peripheral wall 4'' of the ignition hole 1.
6, the igniter 20 slightly protrudes from the outer peripheral wall 4'' of the burner body 4 and is held in a stable position. When the gas is ejected, it receives secondary air from the secondary air hole 10 and becomes a mixed gas that can be immediately combusted. A vortex effect is generated directly above the fluid and the fluid stagnates. Therefore, at this time, when the igniter 20 generates a spark, for example, it is ignited instantaneously and reliably, and the ignition flame 22 is stably formed on the chain-shaped ignition ports 16. This ignition flame 22 serves as a kind of pilot flame, and easily ignites even the rich mixed gas ejected from the gas outlet 15, and is effective in forming and holding the combustion main flame 23 without misfire. be. Furthermore, even if the conditions of the main combustion flame 23 change, the ignition flame 22
There is no lack of stability.

That is, the ignition flame extends outward, and a stable high-temperature vortex region is generated between the lower half of the main combustion flame and the outer peripheral wall of the burner body, and is surrounded by the main combustion flame, causing high-temperature air flow pressure. Because it is pressed by the flame, it is extremely stable and will not misfire under any disturbance conditions.Therefore, it provides reliable ignition and stable ignition flame maintenance, which is not possible with conventional upward flame burners. be.

In addition, since the hole diameter or slit width of the ignition port 16 is regulated to be equal to or less than the width of the gas jet port 15, there is no more mixed gas than necessary from the ignition port 16, so after ignition, Even if the entire burner shifts to rated combustion, the ignition port 1
There is no standing flame, yellow fire, or red fire that generates soot, as in Part 6, and there is always complete combustion of clean blue fire.

Furthermore, by increasing the number of rows and the arrangement configuration of the ignition ports 16 and arranging them in a manner that spreads toward the gas jet port 15, the amount of mixed gas increases and the vortex phenomenon effect is strengthened, thereby igniting the ignition flame 22. As the characteristics improve and the amount of heat of the ignition flame 22 increases,
The ignition characteristics of the combustion main flame 23 are further improved, ensuring reliable,
It is stable. Furthermore, since the notch 13' of the current plate 12 located below the ignition port 16 has a larger area than other parts, the ignition port 16
Since the mixed gas is stably supplied, the above-mentioned ignition characteristics are basically ensured.

Depending on the configuration conditions of the burner body 4, if the number of rows of ignition ports 16 is increased, the position of the igniter 20 may be placed between the ignition ports 16 to strengthen the vortex, or to prevent the upper surface of the ignition ports 16 The ignition characteristics can be improved by counterbore and reduce the jetting speed of the mixed gas.

On the other hand, in terms of configuration, just by appropriately processing the configuration specifications of the ignition port 16 on the burner head side plate 14,
In addition, by simply cutting out the rectifying port 13' in the rectifying plate 13, and by simply installing the igniter 20 in a short length facing the igniter 20, it is possible to reliably ignite under all ignition conditions and maintain stability over time. This makes it possible to realize a combustion device that has significant advantages compared to conventional examples in terms of performance and cost.

As described above, according to the present invention, ignition can be performed smoothly and is extremely stable.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view of the main part of an embodiment of the present invention, FIGS. 2 to 5 are top views of the main part showing various embodiments of the ignition port, and FIG. 6 is the main part of the conventional example. FIG. 4... Burner body, 4'... Inner peripheral wall, 4''... Outer peripheral wall, 8... Burner head, 9... Primary air hole, 1
0... Secondary air hole, 10'... Bottom row hole part of secondary air hole, 12... Rectifier plate, 13... Rectifier port, 1
3'... Notch, 14... Burner head side plate, 1
5...Gas outlet (gas port), 16...Ignition port,
17...gas chamber, 18...combustion chamber, 20...igniter.

Claims (1)

[Claims] 1. A bottomed double cylindrical burner body each equipped with a preheating means, an oil supply means, and an air blowing means, and a small number of low primary premixed gases inserted into the burner body through a small gap in the inner circumferential wall. A burner head with a primary air hole at the bottom and a plurality of secondary air holes that serve as the main flame opening at the top; The burner head side plate is arranged so as to have slit-shaped gas ejection ports around the entire circumference, the vaporization chamber communicates with the primary air hole of the burner body using this burner head side plate as a border, and the secondary air hole side is divided into a combustion chamber. In addition, a plurality of small holes or slit-shaped ignition ports are provided in the side plate of the burner head from the gas outlet side to the outer circumferential wall side of the burner body, and furthermore, the area of the notch is enlarged only in the portion facing the ignition port. A plate is fixed to the peripheral wall of the burner head so as to substantially divide the vaporization chamber into two, and a plate is attached near the outer peripheral wall of the burner body of the ignition port,
A combustion device with a igniter facing out from a part of the burner body.