JPH0229926B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a gas burner that reduces combustion noise, improves the mixing of fuel and air, achieves complete combustion, and performs combustion at a high load rate.

Conventionally, some gas burners supply fuel and air to a combustion chamber and forcibly diffuse the fuel and air. In such a burner, the fuel and air are diffused vigorously to increase the combustion load rate, but the flame becomes a highly turbulent flame, resulting in high combustion noise.
The present invention has been made in view of these drawbacks, and one embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, 2 is a burner chip provided with a fuel injection port 1, and 4 is a combustion plate having a large number of air holes 3. Reference numeral 5 denotes a fuel supply tube, which has a burner tip at its tip. Reference numeral 6 denotes an outer wall, which forms an air chamber 7 together with the fuel supply tube 5 and the combustion plate 4. 8 is an air intake port through which combustion air 11 is supplied to the air chamber 7 from a blower 10 connected to a motor 9. Combustion air homogenized in the air chamber 7 is supplied to the combustion chamber 11 through a large number of air holes 3. 12
is a combustion chamber wall that forms a combustion chamber 11 together with the combustion plate 4.

The fuel 13 is sent to the fuel supply pipe 5 and is supplied to the combustion chamber 11 through the fuel injection port 2 provided in the burner chip 2.

A part of the fuel supplied to the combustion chamber forms an auxiliary flame 14 near the fuel supply port, and most of the remaining fuel mixes with combustion air supplied from the air hole 5 to form a main flame 15. .

At this time, as shown in FIG. 3, the fuel 16 is
It is supplied as follows. Hereinafter, flames are omitted for ease of explanation. When air is supplied through the air holes at a speed lower than the fuel speed, the air flow 18 is curved by the fuel 17. At this time, air and fuel are well mixed on the downstream side of the air hole, forming a main flame 15 as shown in FIG. These flames are formed along the combustion plate and form a flat flame 15. Since the fuel injection ports are provided close to the combustion plate, the fuel flows along the combustion plate and is dispersed over the entire area of the combustion plate while mixing with the air supplied from the air holes.

At this time, the fuel is supplied closer to the combustion plate than the extinguishing distance h of the combustion plate surface. No flame exists within a distance h smaller than the extinguishing distance near the combustion plate. Therefore, since the air ejected from the air hole does not burn within the flame-extinguishing distance, it can spread over a wide area downstream of the air hole and mix with the fuel. When the fuel flow rate is increased, the mixture of fuel and air improves, and this mixture of fuel and air has an extinguishing distance h.
An intense combustion reaction occurs on the more distant combustion plates to form the main flame 15.

In FIG. 2, fuel flows over the outer air hole 19 and a flame rises as shown at 20 in FIG. 1.

The air holes are arranged as shown in FIG. 2 in order to prevent the flame or high-temperature combustion gas from directly colliding with the combustion chamber wall 12 and causing the wall to become hot and corrode. Further, although the inner air holes are located between the fuel jets as shown in FIG. 2, the air holes may be located above the fuel jets. However, the flame tends to rise like the flame 20. When the flame rises, there is no mixing of air and combustion near the combustion plate. At this time,
When the air flow velocity is reduced or the fuel flow velocity is increased, a flame is formed near the combustion plate, similar to when the air holes are located between the jets of fuel.

As described above, in the present invention, fuel with a high flow velocity is supplied near the combustion plate along the combustion plate from a large number of jet ports within a flame-extinguishing distance near the combustion plate, and the fuel with a high flow velocity is supplied from a large number of air ports provided on the combustion plate. By supplying a small amount of air, the fuel is dispersed over the entire combustion plate, and the fuel and air are mixed over a wide range in the wake of the air holes and near the combustion plate. As described above, since the present invention allows good mixing of fuel and air, there is no need to vigorously mix air and fuel as in the past, and a high-load burner with less noise can be provided.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a gas burner according to an embodiment of the present invention, Fig. 2 is a plan view of the same main part, and Figs. 3A and B.
1 is a plan view and a cross-sectional view of a main part showing the flow state of fuel and air in the vicinity of a combustion plate. 1...Fuel spout, 2...Burna tip, 3...
...air hole, 4...combustion plate.

Claims (1)

[Claims] 1. A combustion plate forming a part of a combustion chamber and having a plurality of air ports; a burner chip provided in the combustion chamber such that a plurality of fuel jet ports of the burner chip protrude from the combustion plate; The fuel nozzle is bored parallel to the combustion plate, and the fuel nozzle protrudes into the combustion plate so that the fuel flows along within an extinguishing distance on the surface of the combustion plate, and the fuel flow velocity is greater than the air flow velocity. Gas burner set.