JPS5836250B2 - gas burner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a gas burner that can prevent flame interference at both ends of the burner, thereby eliminating partial flame length elongation and achieving good combustion conditions. It is.

In general, gas burners that have a main flame hole formed by bending a large number of small holes have a large resistance, so the amount of primary air that is naturally sucked in using the jet of gas ejected from the nozzle is small. Since contact with secondary air affects combustion performance, the flame table area is wide.

Therefore, if the flames interfere with each other, sufficient secondary air cannot be obtained and the flame length becomes longer.

In particular, as shown in Figure 6, at both ends of the burner body 1, a flow 2 is generated in which the mixture of gas and air hits the burner side end wall and bounces back, so the main flame located at both ends of the burner The flame 4 formed on the hole 3 tilts inward.

(2) As the secondary air flowing through the burner body 1 causes the flame 4 to incline inward as described above, the flame holding power 5 also inclines inward, the flame holding power weakens, and the flame 3 rises.

■ As mentioned above, the flames at both ends of the burner tilt inward, causing flame interference, making the flame 4 longer, increasing the size of the heat exchanger using the burner body 1, and increasing the combustion characteristics (e.g. Co/
Co2) deteriorates.

In addition, in FIG. 6, 6 is a throttle hole, and 7 is a flame holding plate.

In view of the above points, the present invention attempts to effectively prevent flame interference at both ends of the burner.

An embodiment of the present invention will be described below based on the drawings.

In Figures 1 to 5, an 8-panel body has a large number of /
The main flame holes 9, 9' are formed at the top by bending the side L, and the burner chamber 10 is provided at the bottom.

The main flame hole S, 9' is the conventional one shown in Fig. 6.
The size of the flame holes and the pitch of the flame holes are made uniform at all locations, whereas in this embodiment, the main flame holes γ located at both ends are made smaller in diameter (opening degree) than the other main flame holes 9, and The flame hole pitch is set so that a < b, where the distance between the main flame holes 9 is a, and the distance between the main flame holes 9 and 9' is b.

The flame 19 is formed near the main flame holes 9, 9' of the burner body 8' by forming a holding flame 11 with a heat capacity of about 20 yen of the main flame.
This prevents lifting and maintains a stable flame.

Reference numeral 12 denotes a flame holding plate, which is fixed to the side wall of the burner body 1 and forms a decompression chamber 13 between it and the burner body 8.

Reference numerals 14 and 14' denote throttle holes communicating with the decompression chamber 13, and the opening degree of the throttle holes 14' located at both ends is made large in order to strengthen the flame-holding ability.

15 is a flame holding hole. In addition, a notch 16 for attaching a burner head is formed on the lower central surface of the burner body 8, and the burner body 8 is fixedly attached to the burner head 17 through the notch 16.

Incidentally, the burner head 17 has an inlet 18 connected to a mixing pipe (not shown).

Next, to explain the operation, the dregs ejected by the nozzle and the air sucked by the nozzle are sufficiently mixed in the mixing tube, then introduced into the burner head 17, distributed to the burner chamber 10 of each burner body 8, and then The flow speed increases as it flows toward the top of the main body 8, and it is ejected from each main flame hole 9, 9', forming a fishtail-shaped flat flame 19 with a wide contact surface with the air.

In addition, in order to prevent lifting of the flame caused by the high ejection speed at the main flame holes 9, 9', a part of the air-fuel mixture is throttled from the Parner chamber 10 and passed through the through holes 14, 14' to the decompression chamber 13.
, the pressure is sufficiently reduced, and the flame is ejected from the flame stabilizing hole 15 to form a flame stabilizing hole 11 .

The injection speed and amount of the air-fuel mixture from the flame holding holes 15 are sufficiently lower than those from the main flame holes 9, 9' to maintain a stable flame 11. 19 has been stabilized.

The flame holding holes 15 are arranged in the form of slits over almost the entire length along both sides of each main flame hole 9, 9'.

By the way, as mentioned earlier, since the opening degree of the main flame holes 9' located at both ends of the main flame holes 9 and 9' is made small,
The resistance to the air-fuel mixture injection at the main flame hole 9' is increased, so that the injection amount is regulated and the inclination of the flame 19 caused by the flow direction 2 of the air-fuel mixture in the burner chamber 10 is reduced. By setting the flame hole pitch to a<b, flame interference does not occur even if the flame 19 tilts inward to some extent due to the flow direction 2 of the air-fuel mixture or the secondary air flow 20.

In this case, flame interference can be prevented by changing the opening degree of the main flame holes 9, 9' and by changing the flame hole pitch, respectively, but the synergistic effect of combining the two can prevent flame interference. The prevention of flame interference becomes even more remarkable.

1. In addition, by increasing the amount of air-fuel mixture ejected for both flame-holding purposes, the secondary air flow 20 prevents the flame-holding 11 formed at both ends from becoming unstable (being pulled inward), and the floating system is It is possible to obtain a stable flame 10 without any flames.

[Brief explanation of drawings]

Fig. 1 is a plan view showing an embodiment of the gas burner of the present invention, Fig. 2 is a partially cutaway side view of the gas burner, Fig. 3 is a partially cutaway front view of the burner body, and Fig. 4 is Fig. 3A. 5 is an explanatory diagram showing the combustion state at the end of the burner body, and FIG. 6 is an explanatory diagram showing the combustion state of a conventional burner body. 8... Burner body, 9,9'... Main flame hole, 10... Burner chamber, 11... Flame holding,
12...゜゛・flame holding plate, 13... pressure reducer, 1
4.14'... Throttle hole, 15... Flame holding hole, 16... Burner head mounting notch, 17
...Burna Head, 19...Flame.

Claims (1)

[Scope of Claims] 1 Main flame holes are formed at multiple locations in the vertical direction of the top of the burner body by bending a large number of small holes, and flame holding holes are opened near both sides of these main flame holes. A gas burner characterized in that the main flame hole located at the top end of the burner body has a smaller opening than the main flame holes in other parts. 2. In a gas burner in which a large number of small holes are bent to form main flame holes at multiple locations in the direction of the top of the burner body, and flame holding holes are opened near both sides of these main flame holes, the burner body is A gas burner characterized in that the main flame hole pitch interval at the top end is larger than the main flame hole pitch interval at other parts. 3 A large number of J4Ls are bent to form main flame holes at multiple locations in the lengthwise direction of the top of the burner body, and a plurality of throttle through holes are formed in both side walls of the burner body in the lengthwise direction of the burner body to communicate with the burner chamber in the burner body. In a gas burner in which flame holding holes are provided in the vicinity of both sides of the main flame hole by flame holding plates that are bored at locations and surround these throttle holes, the opening degree of the throttle hole located at the end of the burner body. A gas burner characterized in that the opening is narrower than that of other parts.