JPS5928196Y2 - combustion device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a combustion device, and particularly to a combustion device configured such that the flame of a pilot burner can be maintained stably even in forced air flow.

A conventional combustion device is shown in FIG.

In FIG. 1, 1 is a combustion tube, and 2 is a heat exchanger, which together with the combustion tube 1 constitute a sealed combustion chamber 3.

4 is a plurality of main burners provided in the combustion chamber 3; 5 is a main burner 4;
a blower provided at the rear of the combustion chamber 3 to supply combustion air into the combustion chamber 3; 6 a pilot burner chamber formed by protruding the wall surface of the combustion tube 1 outward; 7 a pilot burner for igniting the main burner 4; 8 is a spark plug, 9 is a flame electrode, 10 is a fuel supply pipe connected to the pilot burner 7, 11 is a blower 5
12 is a primary air suction port provided in the pilot burner 7, and 13 is a flame port of the pilot burner. be.

In the case of this conventional combustion device, the flame of the pilot burner 7 is located at a position where it is not directly affected by the forced airflow flowing through the combustion chamber 3, so it is stable, but on the other hand, because it is separated from the main burner 4, it The disadvantage was that it was difficult to ignite the flame.

For this reason, it would be better to shift the position of the pilot burner 7 upwards, but this time it will be directly affected by the forced airflow.
Not only will the flame of the pilot burner 7 become unstable, but the combustion speed will vary, and the ground contact area will be extremely reduced.

Furthermore, since the flame current value is greatly influenced by the ground area between the inner flame and the flame electrode, a problem arises in that it is not possible to reliably confirm the presence or absence of the flame in the pilot burner 7.

Furthermore, since the flow rate of the combustion air supplied to the pilot burner 7 was high, the combustion in the burner 7 was further made unstable.

However, there is a method described in Japanese Unexamined Utility Model Publication No. 166142/1983 that can meet these demands to some extent.

According to this conventional method, a combustion flame stabilizing coil is directly connected to the tip of the pilot burner tube, and a flame iron is provided facing forward of the coil.

However, with such a configuration, the combustion flame stabilizing coil is heated by the combustion flame, and at the same time, heat is conducted to the pilot burner tube, resulting in a high temperature that may cause backfire or reduce the durability of the pilot burner tube. It will be done.

The present invention was developed in view of the above points, and is designed to facilitate ignition of the main burner, stabilize the flame of the pilot burner even in forced air flow, and prevent backfire from occurring within the pilot burner. The present invention provides a combustion device configured to prevent this.

Hereinafter, embodiments of the present invention will be described based on the drawings.

FIG. 2 shows a combustion device according to this embodiment.

Incidentally, the same elements as in FIG. 1 are given the same reference numerals and their explanations will be omitted.

In Figure 2, 14 indicates that the flame port of the pilot burner 7 is the combustion tube 1.
The pilot burner chamber has a shallow bottom so that it is approximately horizontal with the wall surface, and 15 is a partition plate that partitions the air suction port 12 side and the flame port 13 side of the pilot burner 7. It has air circulation holes 15a.

16 is a plate provided in front of the air supply pipe 11 facing the pipe 11, and 17 is a flame holding rod supported by a supporting member other than the pilot burner 7 above the flame port 13.

In the combustion device having such a configuration, the air supplied from the air supply pipe 11 passes through the plate 1 as shown by the arrow in FIG.
6, its flow velocity is weakened and its direction is changed and a part of it is supplied to the pilot burner 7.

Therefore, the primary air required by the pilot burner 7 is sufficiently supplied by its ejector, and the remaining air flows upward from the communication hole 15a as secondary air.

Further, a flame stabilizing rod 1T faces the flame of the pilot burner T to reduce the influence of the forced airflow flowing through the combustion chamber 3.

Therefore, the combustion speed is stabilized, the influence of forced airflow is reduced, the flame of the pilot burner 7 is stabilized, and the ground area between the inner flame and the flame electrode 9 is stabilized, so the flame current value does not decrease when the flame is present. The presence or absence of flame can be confirmed without fail.

Furthermore, since the main burner 4 and the pilot burner 7 are close to each other, the main burner 4 can be reliably ignited.

In addition, since the flame holding rod 17 is mounted above the flame opening 13 of the pilot burner 7 while being supported by a supporting member other than the pilot burner 7, even if the flame holding rod 17 is heated, heat conduction to the pilot burner 1 is prevented. This can prevent backfire from occurring within the pilot burner 7 and reduce durability.

4 to 6 show another embodiment.

In FIG. 4, the top of the plate 18 formed in the shape of /\ is opposed to the air supply pipe 11.

In this case, the air flow is divided into left and right sides as shown by the arrows in the figure, so that the secondary air flows upward almost uniformly around the pilot burner 7.

In FIG. 5, a rectifying net 19 is attached to the opening of the air supply pipe 11 to provide a rectifying effect.

Furthermore, FIG. 6 shows a flame electrode 9' with a surrounding insulator formed with a large diameter, which is placed in front of the air supply pipe 11 to weaken the air flow. Fifth
As shown in the figure, the airflow is divided into left and right sides.

As described above, according to the present invention, the flame of the pilot burner can be maintained stably even during forced airflow, so that the flame current value is stabilized and the presence or absence of a flame can be reliably detected.

In addition, ignition of the main burner is more reliable than before, and since the flame-holding rod is placed above the pilot burner's flame opening and supported by a support member other than the pilot burner, even if the flame-holding rod is heated. It is possible to provide a combustion device that can prevent heat conduction to the pilot burner, prevent backfire from occurring within the pilot burner, and prevent a decrease in durability.

[Brief explanation of the drawing]

FIG. 1 is a simplified diagram showing the combustion section of a conventional combustion device, FIG. 2 is a simplified diagram showing one embodiment of the combustion section of the combustion device according to the present invention, and FIG. The sectional views of FIGS. 4 to 6 show different embodiments of the pilot burner chamber. 3... Combustion chamber, 4... Main burner, 5... Blower,
7... Pilot burner, 9... Flame electrode, 11...
・Air supply pipe, 14...Pilot burner chamber, 1
5... Partition plate, 16.18... Plate, 19...
- Rectifier network.

Claims (3)

[Scope of utility model registration request] (1) In a combustion apparatus equipped with a pilot burner arranged facing a combustion chamber which has a main burner and is supplied with air from a blower, a flame holding member other than the pilot burner is placed above the flame opening of the pilot burner to hold the flame. At the same time, a member is provided as an obstacle to reduce the flow velocity of the air flow in the passage of air guided from the blower to the pilot burner, and a partition plate having holes for air circulation is provided. A combustion device characterized in that the air intake side and the flame port side of a pilot burner are partitioned. (2) The combustion device according to claim 1, wherein the obstructing member is a plate installed facing the opening of the air passage. (3) The combustion device according to claim 1, wherein the obstructing member is a flame electrode with a surrounding insulator having a larger diameter.