JPH0624659Y2 - Combustion device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a combustion device used in stoves and other household appliances.

(Prior Art) Conventionally, a secondary air cover for covering the primary flame mouth portion is provided to limit the amount of secondary air, and a secondary flame mouth portion is provided for the secondary air cover to perform combustion at the primary flame mouth portion. There is a known formula that prevents the NOx value from increasing by burning the primary combustion and the secondary combustion at the secondary flame mouth part separately. A combustion device in which a flame detector for detecting incomplete combustion of a flame at a flame opening is made to face the primary flame opening is disclosed in JP-A-59-13711.
It is known from the publication.

(Problems to be solved by the invention) However, since the secondary air is restricted in this device, the flame from the primary flame mouth portion is likely to spread and become unstable, which allows the flame detector to detect the flame. It is difficult to heat to the required temperature due to
The flame detector composed of a thermocouple or the like tends to cause an output shortage,
This causes problems such as malfunction of the flame detector that should detect incomplete combustion.

The object of the present invention is to obtain a combustion device that does not have such a problem.

(Means for Solving the Problem) In order to achieve the object, the present invention provides a combustion apparatus according to claim 1, wherein a primary flame mouth portion having a plurality of primary flame holes, and
An air hole for supplying combustion air to the secondary flame opening portion and a secondary air cover for covering the primary flame opening portion and the air hole are provided, and the secondary flame opening portion is provided on the upper surface of the secondary air cover. Was a burner,
A flame detector facing a part of the primary flame opening of the burner, wherein the flame detector faces the secondary air cover 1
A flame shaping plate for adjusting the flame from the primary flame orifice is provided on both upper sides of the secondary flame orifice.

A combustion apparatus according to a second aspect of the present invention is the combustion apparatus according to the first aspect, wherein the air holes are provided at both sides of the primary flame opening portion below the flame shaping plate.

(Operation) In the combustion apparatus according to claim 1 having the above configuration,
Since the flame shaping plates for adjusting the flame from the primary flame opening are provided on both upper sides of the primary flame opening facing the flame detector, the flame at the primary flame opening is shaped by the flame shaping plate. Since the shape of the flame detector is stable, the flame detector faces the correct position of the flame so that the output of the flame detector is stable and malfunctions are reduced unless misfire or lack of oxygen occurs.

In the combustion device according to claim 2 having the above configuration,
The flame at the primary flame opening facing the flame detector is shaped by the flame shaping plate to stabilize the shape of the flame. Furthermore, the flame shaping plate causes the air from the air holes on both sides of the primary flame opening to be primary. The flame from the primary flame hole is shaped by inducing it toward the center of the flame opening, so that the flame at the primary flame opening becomes more stable, unless misfiring or oxygen shortage occurs. Since the flame detector faces the correct position and stabilizes the output of the flame detector, malfunctions are reduced.

(Embodiment) One embodiment of the present invention will be described with reference to the attached drawings.

In the drawing, 1 indicates a burner, which is a gas nozzle 2
Facing the fuel-air inlet 3, mixing tube 4 and distribution chamber 5
And a large number of primary flame holes 6a formed in the opening 5a on the upper surface of the distribution chamber 5 of the burner body 1a.
It comprises a flame hole plate 7 having a secondary flame hole portion 6 and a secondary air cover 8 formed on the upper surface of the flame hole plate 7 so as to cover the primary flame hole portion 6. The upper surface is provided with a secondary flame mouth portion 8a along the length direction thereof. The burner main body 1a is provided with a collar-shaped portion 9 extending on both left and right sides of the distribution chamber 5 and provided with rising pieces 10 rising from both ends of the collar-shaped portion 9, and the flame hole plate 7 is overlapped with the collar-shaped portion 9. The collar-shaped portion 9 has a size including a portion.
In addition, air holes 11 are arranged in a row at the overlapping portion of the flame hole plate 7.
It should be noted that when both ends of the flame hole plate 7 and both side portions of the flame hole plate 7 close to the flame hole plate 7 are provided with the rising pieces 12, the upper surface of the flame hole plate 7 is provided with the secondary air cover 8, the rising piece 10 , 12 to close the gap between the secondary air cover 8 and the burner body 1a so that excess air does not flow into the secondary air cover 8.

Reference numeral 13 denotes a flame detector such as a thermocouple which faces one end of the primary flame mouth portion 6, and 14 denotes the primary flame provided on both upper sides of the primary flame mouth portion 6 facing the flame detector 13. 2 shows a flame shaping plate for adjusting the flame from the mouth portion 6. The flame shaping plate 14 is a pair of left and right guiding plates 14a protruding from the left and right sides so that the center is higher, as is clear from FIGS. 2 and 3. , 14a, and when the flame from the primary flame mouth 6 in the portion surrounded by the flame shaping plate 14 rises along the guide plates 14a, 14a forming the flame shaping plate 14, the flame is shaped. It is possible to prevent the instability from being stretched for a long time. That is, the flame is stabilized.

Then, as is apparent from FIG. 5, when air holes 11 are provided at both sides of the primary flame mouth portion 6 below the flame shaping plate 14,
The air from the air holes 11 on both sides of the secondary flame opening 6 is guided toward the center of the primary flame opening 6 to shape the flame from the primary flame opening 6 as well. The flame of part 6 becomes more stable.

The flame detector 13 faces the part of the primary flame opening 6 through the mounting hole 16, and is provided on the mounting plate 22 that functions as a partition by closing the end of the flame shaping plate 14. The mounting hole 16
A through hole 17 is provided so as to communicate with the lower portion thereof, and the air supplied through the through hole 17 through the air hole 11 on the outer side of the mounting plate 22 is the primary flame opening 6 facing the flame detector 13. The flame from the primary flame mouth 6 which is supplied to the root portion of the flame from the flame detector 13 is stabilized. The through hole 17 is not limited to the one communicating with the lower portion of the mounting hole 16 through which the thermocouple is inserted, but may be separately provided as long as it is a position to be supplied to the root of the flame of the primary flame mouth portion 6. Further, in this embodiment, the mounting plate 22 is provided inside the rising piece 12 and the through hole 17 is provided in the mounting plate 22, but the mounting plate 22 may be eliminated and the through hole 17 may be provided in the rising piece 12. By making the air holes 11 in the portion covered by the flame shaping plate 14 larger than those in the other portions, it is possible to prevent the flame in the portion from further extending due to lack of air and becoming unstable. Reference numeral 18 denotes an igniter facing the primary flame opening 6 at the end opposite to the end where the flame detector 13 of the primary flame opening 6 faces. The flame detector
Reference numeral 13 indicates, for example, that the electromotive force generated when this is heated by the flame of the primary flame mouth 6 causes the valve 20 interposed in the gas supply passage 19 to be opened and held, resulting in misfire and lack of oxygen in the room air.
It is used to control the valve 20 to close when the output of the flame detector 13 due to the flame of the secondary flame opening 6 decreases.

Further, in the combustion apparatus capable of switching the combustion ability, when the auxiliary covers 21 are attached to both sides of the primary flame mouth portion 6 as shown in FIGS. 6 and 7, the NOx value can be lowered by this. .

Its value is the following.

However, the height of the secondary air cover is 50 mm, the width is 39 mm, the height of the auxiliary cover is 10 mm, and the space is 16 mm.

It is considered that this is because the flame that burns at the primary flame mouth was small when the capacity was small, and the restriction of the air amount by the auxiliary cover worked effectively to reduce the NOx value greatly. As shown in FIGS. 8 and 9, a secondary air hole 23 is provided in the auxiliary cover in order to supply the appropriate secondary air for combustion at a small capacity, or the flame hole plate 7 surrounded by the auxiliary cover. It is also possible to provide an air hole 24 in the. In this case, the air vent 1 shown in FIG.
The total area of 1, 24 is equal to the total area of the air holes 11 shown in FIG. 7 so that the air in the secondary air cover 8 at the time of large combustion does not become excessive.

(Effects of the Invention) Since the present invention has the above-described configuration, it has the following effects.

In the combustion apparatus according to claim 1 having the above configuration,
The flame shaping plate shapes and stabilizes the flame that tends to win secondary air deficiency and become unstable for a long time, and as a result, unless a misfire or oxygen deficiency occurs, the flame detector is located at the correct position of the flame. Therefore, the output of the flame detector can be stabilized and the malfunction of the flame detector can be reduced. Moreover, by stabilizing the flame, a predetermined output can be obtained from the flame detector relatively quickly even at the time of ignition.

In the combustion device according to claim 2 having the above configuration,
The flame shaping plate shapes and stabilizes a flame that is likely to win secondary air deficiency and becomes unstable for a long time. Further, the flame shaping plate secures air from the air holes on both sides of the primary flame mouth. The flame is guided to the center side of the primary flame hole, and the flame from the primary flame hole is shaped by this as well, so that the flame detector faces the correct position of the flame unless misfire, oxygen deficiency, or the like occurs. The output of the detector can be stabilized and the malfunction of the flame detector can be reduced.

Moreover, the flame is stable, and a predetermined output can be obtained from the flame detector more quickly when ignited.

[Brief description of drawings]

FIG. 1 is a cutaway side view of an embodiment of the present invention, FIG. 2 is a perspective view of a part thereof, FIG. 3 is a cutaway sectional view of an essential part, and FIG.
Fig. 5 is an exploded perspective view of the drawing, Fig. 5 is a plan view of a part thereof, Fig. 6 is a cutaway side view of another embodiment, and Fig. 7 is a sectional view taken along the line VII-VII of Fig. 8, Fig. 8 and Fig. 9. Shows the modification. 1 …… Burner, 8 …… Secondary air cover 13 …… Flame detector, 14 …… Shaping plate

Claims (2)

[Scope of utility model registration request] 1. A primary flame opening portion having a plurality of primary flame openings, an air hole for supplying combustion air to the primary flame opening portion, and 2 for covering the primary flame opening portion and the air hole. A second air cover, and
A burner in which a secondary flame opening is provided on the upper surface of a secondary air cover, in which a flame detector is exposed to a part of the primary flame opening of the burner, And a flame shaping plate for arranging the flame from the primary flame mouth portion on both upper sides of the primary flame mouth portion facing the flame detector. 2. The combustion apparatus according to claim 1, wherein the air holes are provided at both sides of the primary flame opening portion below the flame shaping plate.