JPS6215613Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a gas burner that has a highly stable combustion state, achieves complete combustion by improving the mixing of fuel and air, and performs combustion at a high load rate.

Conventionally, some burners for combustion in a narrow space increase the flow rate of air and fuel to improve their mixing. Combustion in such a combustor tends to become unstable because the air and fuel flow velocities are high. A conventional example having the above-mentioned drawbacks is shown in FIGS. 1 and 2. FIG. 1 is a half section of a side view, and FIG. 2 is a half of a front view, with the flame omitted here. Fuel is supplied from a large number of burner ports 3 provided in the circumferential direction of a burner tip 2 provided at the tip of a fuel supply cylinder 1. On the other hand, the combustion air 4 passes through the air chamber 5 and is supplied to the combustion chamber 8 through the air ports 7 provided in the combustion plate 6 . At this time, the fuel and air introduced into the combustion chamber 8 form a main flame 9 near the air port 7. Further, a part of the fuel burns near the burner tip 2 to form an auxiliary flame 10. This auxiliary flame 10 supplies heat to the main flame 9 and contributes to the stability of the main flame 9. In such a burner, the flame port 3 is provided to protrude from the combustion plate 6 into the combustion chamber 8 to prevent the auxiliary flame 10 from coming into contact with the combustion plate 6 and causing incomplete combustion or unstable combustion. There is. Therefore, the supply of fuel to the air port 11 near the flame port 3 is poor, and the flame in this area tends to produce a flame 12 that is distant from the air port 11 as shown in FIG. 1, resulting in an unstable flame.

The present invention has been devised in view of these drawbacks of the conventional example, and one embodiment of the present invention will be described below with reference to the accompanying drawings. In FIG. 3, 13 is a fuel supply tube, 14 is a burner tip provided at the tip of the fuel supply tube 13, and 15 is a flame port provided in the burner tip 14. 16 is a combustion plate which is flat. 17
Numerous air ports are provided in the combustion plate 16, and the air ports 17 are provided at a certain distance from the fuel supply tube 13. As shown in the drawings, they are arranged in multiple stages and in a staggered manner with respect to the fuel supply cylinder 13.
Reference numeral 18 denotes an outer wall, which forms an air chamber 19 with the fuel supply cylinder 13 and the combustion plate 16. 20 is an air intake port. 21 is a combustion chamber wall, and this combustion chamber wall 20 is installed around the combustion plate 16, and forms a combustion chamber 22 with the combustion plate 16. Fuel 22 is fuel supply cylinder 1
3, and a large number of flame ports 15 provided on the burner tip 14 provided at the tip of the fuel supply cylinder 13.
A portion of the flame is supplied to the combustion chamber 22 , a portion of which forms an auxiliary flame 23 near the burner tip, and a majority of which forms a main flame 24 near the air port 17 . combustion air 2
5 is introduced from an air intake 20 by a blower or the like (not shown), supplied to the air chamber 19, and then flows into the combustion chamber 22 through a large number of air ports 17 provided in the combustion plate 16 forming the air chamber 19. This air mixes with the fuel flowing in through the flame port 15 to form a main flame 24 and exits from the combustion chamber 22 as a combustion gas stream 26 . The flame port 15 is inclined at α toward the combustion plate 16 from a direction perpendicular to the direction of the combustion gas flow 26, and is provided toward the air port 27 located closest to the fuel supply tube 13. In FIG. 3, the angle α indicates the direction away from the air port 27 closest to the fuel supply tube 13, but since the fuel spreads after being ejected from the flame port 15, The air is supplied to the nearest air port 27. Therefore, by supplying the fuel to the vicinity of the air port 27 near the flame port 15, the mixing of fuel and air in this area becomes extremely good, and furthermore, the mixing of fuel and air occurs near the combustion plate 16. This allows for undisturbed mixing. Also, flame outlet 1
Due to the Coanda effect (wall effect), the fuel ejected from the combustion plate 16 spreads along the combustion plate even if it is far away from the burner tip.
It spreads along. Furthermore, as shown in FIG. 2, in the fuel plate, the air ports 27 are arranged in a staggered pattern starting from the side closest to the burner tip 14, so that the fuel coming out from the burner port 15 of the burner tip 14 is transported through the air ports. The fuel and air are mixed uniformly by being divided sequentially. Furthermore, the auxiliary flame 23 is connected to the air port 27.
Since it is closer to the air port 27, more heat is supplied to the vicinity of the air port 27. Therefore, the flame adheres to the air port 27, and a stable flame can be obtained. Also, due to the presence of the combustion chamber wall 21, a portion of the combustion gas flow 26 forms a circulating flow. This circulating flow 28 has a high temperature and forms the auxiliary flame 23 stably.

Here, the auxiliary flame 23 is formed between the air port 27 closest to the fuel supply cylinder 13 and the flame port 15,
If the angle α is made smaller or the air port 27 is brought closer to the fuel supply cylinder 13, the fuel and air will be intensively mixed at a position away from the combustion plate 16, and the fuel will reach the air port 17, which is away from the flame port 15. The flame is formed near the fuel supply cylinder 13, and as a result, the flame length becomes longer. However, in this embodiment, a portion of the fuel mixes with air near the air port 27, and most of the fuel flows along the combustion plate 16, and then flows through the air port 1, which is remote from the fuel supply tube 13.
7 and mixes with air to form a flame, so the flame length does not increase.

As described above, according to the present invention, the flame port through which fuel is injected into the combustion chamber is inclined from a direction perpendicular to the flow of the combustion gas toward the combustion plate and is also provided facing the air port located closest to the fuel supply tube, so that fuel is supplied to the air port near the flame port.
A stable flame can be obtained by attaching the main flame to the air port. Also, the combustion chamber wall around the combustion plate circulates part of the combustion gas flow, and because it is high in temperature, the auxiliary flame generated at the burner tip port can be stabilized.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional gas burner, FIG. 2 is a plan view of the same essential part, and FIG. 3 is a sectional side view of a gas burner according to an embodiment of the present invention. 13...Fuel supply tube, 14...Burna tip,
15... Flame port, 17, 25... Air port, 21...
Combustion chamber wall, 24...main flame.

Claims (1)

[Scope of utility model registration request] It has a flat combustion plate having a large number of air ports, a fuel supply tube perpendicular to the combustion plate, and a burner tip installed at the tip of the fuel supply tube so as to protrude from the combustion plate, In a gas burner where the air ports are provided at a certain distance from the fuel supply cylinder, the air ports are arranged in multiple stages and in a staggered pattern with respect to the fuel supply cylinder, and the combustion chamber wall installed around the combustion plate is used to prevent combustion. A gas burner forming a chamber, and characterized in that a flame port provided in the burner tip is inclined toward the combustion plate and is provided toward an air port located closest to the fuel supply cylinder.