JPS6238112Y2 - - Google Patents

Description

[Detailed description of the invention] This invention enables switching between gas fuel and oil fuel,
Regarding a gas/oil fuel burner that can perform gas combustion, oil combustion, and co-combustion of both, the purpose of the invention was to share the ignition source, simplify the burner configuration, and reduce the size and cost of the burner. At the same time, it is an object of the present invention to provide an ignition device that can perform ignition well and reliably during each combustion, and will be specifically described below based on an embodiment shown in the drawings.

Reference numeral 1 is mainly a burner for both gas and oil fuel, and has a fan tube 2 having a built-in blower (not shown) and a burner tube 4 connected to a discharge port 3 of the fan tube 2. A gas chamber 5 is provided around the outer periphery of the burner tube 4, and a connecting device 7 for a gas conduit 6 is provided on the side surface of the gas chamber 5 on the fan tube 2 side. Further, an annular mixing chamber 8 is provided inside the burner tube 4 facing the inner wall of the tube, and an air passage 9 is formed inside the mixing chamber 8. In addition, at the front of the mixing chamber 8 is a tapered flame port 10 that is connected to the tip edge of the burner tube 4.
A large number of flame ports 11 are provided. The rear wall 12 of the mixing chamber 8 has many air holes 1 all around it.
3 are placed at equal intervals. Reference numeral 14 denotes gas outlet holes provided in the burner tube 4 facing the gas chamber 5 and the mixing chamber 8, and a large number of gas outlet holes are provided around the entire circumference of the burner tube 4 at equal intervals. Reference numeral 15 denotes a holder metal fitting that supports and fixes the electrode insulator 16 and the nozzle adapter 17. A plurality of mounting legs 18 provided integrally with the holder metal fitting 15 are fixed to the inner surface of the burner tube 4, and the electrode insulator 16 and the nozzle adapter 17 are fixed.
A plurality of mounting legs 18 provided integrally with the holder metal fitting 15 are fixed to the inner surface of the burner tube 4 to support the electrode insulator 16 and the nozzle adapter 17 in the air passage 9. be. 19 is an oil fuel spray nozzle screwed onto the nozzle adapter 17, and 20 is an oil conduit connected to the nozzle adapter 17 with a nut 21. 22 is the flame port 10 in front of the spray nozzle 19
A flame-holding plate provided in the rear air passage 9, the flame-holding plate 2
2 has a jet nozzle 23 in the center and a swirling blade 2 cut out around the periphery.
It has 4.

Reference numeral 25 denotes an ignition gas conduit having one end opened into the gas chamber 5. The gas conduit 25 passes through the mixing chamber 8, and has an opening 26 facing downward toward the spray nozzle 19. Reference numeral 27 designates a pair of ignition electrodes attached to the electrode insulator 16, and the ignition electrodes 27 are arranged above the spray nozzle 19 and below the opening 26 of the ignition gas conduit 25.

The present invention has the above-described configuration, and in order to perform oil combustion, fuel oil is force-fed to the oil-fuel spray nozzle 19. Then, the fuel oil is sprayed at the angle shown in Figure 3,
It mixes with the swirling air generated by the swirling blades 24 and is ignited by the spark generated at the ignition electrode 27, causing combustion. In addition, the air blown out from the flame port 11 through the air hole 13 via the mixing chamber 8 is supplied as secondary air to the combustion flame formed in front of the flame holding plate 22, and the combustion flame can spread to the surrounding area. It is carried out smoothly without any problems. In order to perform gas combustion, gas is supplied to the gas conduit 6, and the gas is sent from the gas chamber 5 through the gas outlet hole 14 to the mixing chamber 8, and within the mixing chamber 8, the gas is sent through the air hole 13. This mixture is ejected from the flame port 11 of the flame port part 10, while the gas supplied from the ignition gas conduit 25 is ignited by the spark of the ignition electrode 27 to form an ignition flame. The ignition flame extends forward through the flame holding plate 22, and the jetted air-fuel mixture is ignited by the ignition flame and combusts. The air swirled by the swirling blades 24 in the air passage 9 becomes secondary air with respect to the combustion flame formed in the flame port 11, and is sufficiently mixed with air, resulting in good gas combustion. It is.

However, in this type of burner, if ignition devices are provided for oil combustion and gas combustion, the structure inside the burner becomes complicated, the burner becomes large, and the cost becomes high. On the other hand, in the present invention, the ignition gas conduit 25 connected to the gas source is opened downward from above the spray nozzle 19, so that the fuel oil spray area A and the gas fuel spray area B of the spray nozzle are in the area C.
Since the ignition electrode 27 is arranged above the spray nozzle 19 and below the opening 26 of the ignition gas conduit 25, a spark is generated in the overlapping area C. Therefore, the spark generated at the ignition electrode 27 This ensures that the gas ejected from the opening 26 and the sprayed oil from the spray nozzle 19 are respectively ignited.

Therefore, according to the present invention, the ignition electrode can be used in common as an ignition source for gas combustion and oil combustion, and the structure of the burner can be simplified, making it possible to downsize the burner and reduce costs. Ignition during combustion can also be achieved reliably, which brings about extremely beneficial effects in practical terms.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention;
FIG. 2 is a sectional view taken along the line AA in FIG. 1, and FIG. 3 is a sectional view of the main parts. 4... Burnatube, 8... Mixing room, 9...
Air passage, 10...flame port, 19...spray nozzle, 22...flame holding plate, 25...ignition gas conduit,
26...Opening, 27...Ignition electrode.

Claims (1)

[Scope of utility model registration request] Inside the burner tube, an annular mixing chamber is provided that is connected to the gas fuel source and communicates with a gas chamber provided around the outer periphery of the burner tube, having a flame opening at the front and an air hole at the rear. An air passage is formed, an oil-fuel spray nozzle and a flame-holding plate are provided opposite the spray nozzle in the air passage, and an ignition gas conduit connected to the gas chamber is opened downward from above the spray nozzle. An ignition device for a gas/oil fuel burner, characterized in that an ignition electrode is disposed above the spray nozzle and below the opening of the ignition gas conduit.