JPS6130055Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an ignition device for an original mixing type gas burner. There are two types of ignition methods for gas burners: the direct method, which ignites the gas ejected from the flame nozzle by directly applying a spark, and the pilot method, which ignites the gas using a pre-formed pilot flame.The latter is recommended when considering safety, such as preventing explosion and ignition. The pilot style is excellent. The present invention employs a pilot ignition method, guarantees reliable and stable ignition performance, and provides a gas burner that is easy to manufacture and has a small number of parts. A detailed explanation will be given based on an example of a mixed combustion burner that can be built in and switchable between gas combustion and oil combustion.

1 is a gas/oil burner main body, and main body 1 is a fan casing (not shown) that houses a fan.
and a burner tube 2 connected to the fan casing and into which air from the fan is sent. Reference numeral 3 denotes an annular gas chamber surrounding the outer wall of the burner tube 2, and a connecting device 5 for the gas conduit 4 is provided on the side surface of the gas chamber 3. Reference numeral 6 denotes an annular mixing chamber disposed around the burner tube 2 facing the inner wall of the burner tube 2, and the front of the mixing chamber 6 is closed with a tapered flame opening 7 connected to the tip edge 2' of the burner tube 2. , the flame port part 7 is provided with a large number of flame ports 8. The rear of the mixing chamber 6 is closed by an annular plate 9 facing perpendicularly to the air blowing direction of the fan in the burner tube 2, and the annular plate 9 is provided with air holes 10 at equal intervals around the entire circumference. . Reference numeral 11 designates gas inlet ports opened at equal intervals around the entire circumference of the burner tube 2 facing the gas chamber 3 and the mixing chamber 6. Further, the inner tip of the burner tube 2 forms a secondary air passage 12 inward by forming a mixing chamber 6, and a flame opening 7 in the secondary air passage 12.
A flame holding plate 113 is attached to the starting end.
It has a jet nozzle 14 in the center and a swirling blade 1 cut on the peripheral surface.
5 is provided. 16 has one end opening 17 connected to the gas chamber 3
A pilot conduit connected to and fixed to the conduit 1.
6 passes through the mixing chamber 6, is bent to extend forward along the wall of the mixing chamber 6, and is bent again to direct the opening 18 downward. 19 is the electrode insulator 2 of the ignition electrode 20
1 and a nozzle adapter 22 in the secondary air passage 12 inside the burner tube 2. The holder metal fitting 19 can be attached to the inner wall of the burner tube 2 by attaching a plurality of mounting legs 23 to the inner wall of the burner tube 2 with screws or the like. Fixed. 24 is an oil spray nozzle, and 25 is an oil conduit connected to the nozzle adapter 22 by a nut 26. 27 and 28 are screws for fixing the electrode insulator 21 and the nozzle adapter 22 to the holder fitting 19, respectively. The ignition electrode 20 is located approximately midway between the opening 18 of the pilot conduit 16 and the oil spray nozzle 24. A groove 29 into which the pilot conduit 16 is inserted is provided on the upper surface of the electrode insulator 21. To assemble the burner, a gas chamber 3 and a mixing chamber 6 are formed in the burner tube 2, and a flame stabilizing plate 13 and a pilot conduit 16 are attached. In this state, the pilot conduit 16 only has one end opening 17 fixed, has a slight gap with the inner wall of the mixing chamber 6, and swings vertically and horizontally. Next, the electrode insulator 21 and the nozzle holder 22 are tightened and fixed to the holder metal fitting 19 with screws 27 and the nozzle holder 22 are fastened to the holder metal fitting 19 with screws 28, and the oil spray nozzle 24 and the oil conduit 25 are attached to the nozzle holder 22.
Connect. Then, with the above components assembled, insert the holder metal fitting 19 into the burner tube 2, and attach the mounting legs 23 to the burner tube 2 with screws etc.
Fix it to the inside wall. By inserting this holder metal fitting 19, the pilot conduit 16 fits into the groove 29 provided in the electrode insulator 21 as shown in FIG. When the pilot conduit 16 is pressed against the peripheral wall and the holder metal fitting 19 is in the fixed position, it fits into the groove 29 of the electrode insulator 21 and is pressed against the inner peripheral wall of the mixing chamber 6, so that the pilot conduit 116 does not swing vertically or horizontally. It will disappear.

Also, to explain the combustion process of the gas burner according to the present invention having the above configuration, the gas supplied to the gas chamber 3 is sent to the mixing chamber 6 and the pilot conduit 16,
The gas sent to the mixing chamber 6 mixes with air supplied from the air hole 10. The gas ejected from the opening 18 of the pilot conduit 16 ignites the spark generated at the ignition electrode 20 to form a pilot flame, which extends in front of the flame holding plate 13 and flows from the mixing chamber 6 to the flame at the flame port 7. The mixed gas ejected from the port 8 ignites the pilot flame and combusts. The blown air in the secondary air passage 12 is turned into a swirling flow by the flame stabilizing plate 13 and sent as combustion secondary air at the flame opening, so that combustion is carried out in a good condition.

Therefore, the present invention has the following effects.

That is, since the pilot conduit 16 is sandwiched between the electrode insulator 21 and the inner peripheral wall of the mixing chamber 6 and is fitted into the groove 29 of the electrode insulator 21, the pilot conduit 16 can close the opening 18 without swinging vertically or horizontally. Since the positional relationship between the ignition electrode 20 and the ignition electrode 20 is maintained in an appropriate state, reliable ignition performance can be obtained. Next, the pilot conduit 16 is fixed without using any fixtures or the like, and it is done automatically by inserting the holder metal fitting 23 into the burner tube 2, so there is no need for a process for fixing the pilot conduit 16. It also has the advantages of good manufacturability and a small number of parts. In this embodiment, the pilot conduit is also pressed against the inner circumferential wall of the mixing chamber to make it more firmly fixed, but the above effect can also be obtained by using the elasticity of the pilot conduit to fit it into the groove and press it into contact with the restoring force of the conduit. can be achieved.

[Brief explanation of the drawing]

FIG. 1 is a side cross-sectional view showing an embodiment of the present invention, FIG. 2 is a cross-sectional view of the main part, and FIG. 3 is an explanatory view showing an assembled state. 2...Barnatube, 6...Mixing room, 7...
Flame opening portion, 12... Secondary air passage, 16... Pilot conduit, 19... Holder fitting, 20... Ignition device, 21... Electrode insulator, 29... Groove.

Claims (1)

[Scope of utility model registration request] An annular mixing chamber that communicates with a gas source and has a flame port at the front is formed in the burn tube, and a secondary air passage is formed inside the mixing chamber, and a pilot conduit connected to the gas source is connected to the secondary air passage. A gas burner characterized in that a groove into which the pilot conduit is fitted is provided in an electrode insulator of an ignition electrode led out from the ignition electrode and fixed to a holder metal fitting, and the pilot conduit is fitted into the groove and fixed by inserting the holder metal fitting.