JPH0525123U - Low Nox gas burner - Google Patents

Abstract

(57) [Summary] [Purpose] Low No with a large combustion ratio of large combustion and small combustion.
x Provide a gas burner. [Structure] An opening edge 6 is formed on the upper surface of the mixing chamber 5 over the entire circumference, and comb teeth ridges 12 are radially provided on the upper surface of the opening edge 6 to form a main flame hole 13, and mixing is performed. Room 5
One side is communicated with the mixing chamber 5 on the outer side of the sub chamber 8 and the sub chamber flame hole 10 is formed between the other end of the sub chamber 8 and the opening edge portion 6.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a low Nox gas burner used for a gas combustion appliance such as a gas stove.

[0002]

[Prior Art]

 As shown in FIG. 2, a conventional gas burner for a gas stove has a burner body 1 in which a mixing chamber 5 for fuel gas and primary air is formed. The burner body 1 has a flat opening edge on the upper surface. The part 6 is formed. A burner cap 2 is provided on the burner body 1 with comb teeth-shaped projections 12 radially over the entire circumference, and is removably mounted on the opening edge portion 6 via the projections 12. The gap between them is the main flame hole 13. The fuel gas is supplied from a nozzle 15 provided at the other end of the burner body 1, and its jetting energy causes primary air to be suction-mixed from the primary air hole 14 and jetted as a main flame from the main flame hole 13 to burn it. ..

In recent years, the gas stove has been required to increase its combustion amount, while also requiring small thermal power combustion, and its combustion amount has been in the range of about 4,000 to 400 Kcal / h. From the standpoint of environmental protection, there is a strong demand for reduction of Nox (nitrogen oxide), and gas stoves are no exception.

In order to reduce Nox in a gas combustion appliance such as a gas stove, it is necessary to delay the combustion speed of the burner to lower the temperature of the combustion flame, and an exhaust gas mixing method or the like is performed. For example, in FIG. 2 described above, an auxiliary flame hole 16 is provided outside the mixing chamber 5, an auxiliary flame is generated below the opening edge portion 6, and the main flame of the main flame hole 13 is contacted with combustion exhaust gas of the auxiliary flame. In some cases, the burning rate of the main flame is delayed by doing so. (For example, JP-A-3-144206)

[0005]

[Problems to be Solved by the Invention] When the combustion amount range is 4,000 to 400 Kcal / h and the combustion ratio is 1/10, normal combustion is difficult because a lift or red fire occurs during large combustion, and flashback occurs during small combustion. is there. On the other hand, in terms of Nox, it is very effective as a Nox reduction method that the auxiliary flame hole 16 is provided to reduce the combustion speed of the main flame. The combustion exhaust gas amount of 16 is too large, which hinders good combustion.

[0006] In addition, there is a problem in that the small amount of combustion causes a small amount of combustion and the combustion cannot be continued, and raw gas is emitted.

[0007]

[Means for Solving the Problems]

 The present invention has been made to solve the above problems, and a comb tooth-shaped protrusion is formed on the upper surface of a burner body which is formed on the upper surface of the mixing chamber over the entire circumference so as to correspond to the opening edge. Place a burner cap radially provided around the circumference, form a main flame hole at the opening edge and the ridge, and provide a sub-chamber on the outside of the mixing chamber so that one communicates with the mixing chamber. A secondary flame hole is formed between the other end and the opening edge portion.

[0008]

[Action]

 According to the present invention configured as described above, at the time of large combustion, the flame of the sub-chamber flame hole in the main flame hole portion acts as sleeve fire to the main flame hole, prevents lift and stabilizes the flame. Exhaust gas is mixed with secondary air and supplied to reduce NOx.

Further, even if the sub-chamber flame holes are extinguished and raw gas is ejected at the time of low-power combustion, since it is in the vicinity of the main flame holes, it becomes secondary air and burns well with the air-fuel mixture ejected from the main flame holes. ..

[0010]

【Example】

 An embodiment of the present invention will be described below with reference to FIG. 1, which is a sectional view of a low Nox gas burner.

The gas burner is composed of a burner body 1 and a burner cap 2. The burner body 1 has a mixing chamber 5 between a fitting cylindrical portion 3 at the center and an annular body portion 4 on the outside. The upper surface of the burner body 1 is open, and an annular surface 7 is formed so as to be inclined downward from the opening edge portion 6 toward the center.

A sub-chamber 8 is attached to a part of the burner body 1 in an airtight manner and communicates with the mixing chamber 5 through a hole 9. One end of the sub-chamber flame is at the upper end of the annular surface of the burner body 1. It is opened as a hole 10.

On the other hand, the burner cap 2 has a dish shape, and a mounting cylinder portion 11 that fits into the fitting cylinder portion 3 of the burner body 1 is formed in the central portion. Further, a large number of protrusions 12 are radially provided at equal intervals on the outer peripheral edge on the back surface side of the burner cap 2 and have a comb-like shape as a whole. With the fitting of the mounting tubular portion 11 to the fitting tubular portion 3, these ridges 12 abut the annular surface to form a main flame hole 13 opening to the outer peripheral side.

A primary air hole 14 is provided at the other end of the burner body 1, and a nozzle 15 for supplying fuel is attached to the center of the primary air hole 14.

In the gas burner configured as described above, when fuel is supplied from the nozzle 15, the primary air is sucked and mixed from the primary air hole 14, ejected from the main flame hole 13 into the mixing chamber 5, and ignited by a separate igniter. To burn. At this time, a part of the air-fuel mixture flows from the through hole 9 to the sub chamber 8 and burns in the sub chamber flame hole 10.

The flame in the main flame hole 13 lifts up and blows off at the time of ignition with 13A-3 gas or the like, which is particularly likely to lift during large combustion (high load combustion), but the flame in the auxiliary chamber flame hole 10 Becomes sleeve fire and stabilizes the flame of the main flame hole 13, and at the same time, the combustion gas of the flame of the sub chamber flame hole 10 is mixed with the secondary air of the main flame hole 13 and supplied, so that low O ₂ combustion occurs. As a result, the combustion speed is delayed to lower the temperature of the combustion flame, resulting in low Nox.

Further, at the time of small combustion (low-load combustion), the flame in the sub-chamber flame hole 10 becomes low in temperature and may not be able to continue combustion due to a low load, but the raw gas ejected from the sub-chamber flame hole 10 is Good combustion with secondary air in the main flame 13 part.

The amount of Nox generated at this time is small because of low-load combustion.

[0019]

[Effect of the device]

 As described above, according to the present invention, the Nox low system is achieved by providing the sub chamber having the sub chamber flame hole, one of which communicates with the mixing chamber and the other of which faces the main flame hole, outside the mixing chamber. However, lift during large combustion is prevented, and in addition, combustion may not be able to continue in the auxiliary chamber flame hole during small combustion, but the raw gas ejected from the auxiliary chamber flame hole burns well with the secondary air in the main flame hole. However, the amount of Nox generated is small.

Therefore, it is possible to provide a low Nox gas burner having a large combustion ratio.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a low Nox gas burner showing an embodiment of the present invention.

FIG. 2 is a sectional view of a low Nox gas burner showing a conventional example.

[Explanation of symbols]

 1 Burner Body 2 Burner Cap 5 Mixing Chamber 6 Opening Edge 8 Subchamber 10 Subchamber Flame Pore 12 Projection 13 Main Flame Pore

Claims (1)

[Scope of utility model registration request] 1. A mixing chamber for mixing fuel gas and primary air
(5), which has an opening edge (6) formed on the upper surface of the mixing chamber (5) over the entire circumference, and on the upper surface of the burner body (1), which has a comb-teeth shape corresponding to the opening edge (6) on the back surface. Place the burner cap (2) radially provided on the ridges (12) of the above, and form the main flame hole (13) by the opening edge (6) and the ridges (12), and mix chamber A sub-chamber (8) is formed outside the (5), one of which communicates with the mixing chamber (5).
A low Nox gas burner in which the other end of (8) is provided in the opening edge (6) with a gap to form a sub-chamber flame hole (10).