JPS6130054Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an original mixing type gas burner. Conventionally, this type of gas burner mixes supply gas and air in a mixing chamber, and sends this mixture to a flame opening for combustion. There are two methods for igniting the above-mentioned air-fuel mixture: the direct ignition method, in which a spark is directly applied to the air-fuel mixture to ignite it, and the pilot ignition method, in which the mixture is ignited by a pre-formed pilot flame. The latter's pilot ignition system is excellent. However, if the pilot ignition type is adopted, the piping of the gas passage is complicated in the conventional type, and a control device is also required because a pilot flame must be formed when the air-fuel mixture is ejected. The present invention provides a pilot ignition type gas burner that does not complicate the gas supply passage and does not require the above-mentioned control device. A specific explanation will be given based on the gas/oil fuel burner that has been made possible.

1 is a burner main body, a fan casing 2 housing a blower, and a discharge port 3 of the fan casing 2.
It consists of a burner tube 4 connected to the An annular gas chamber 5 is provided around the outer periphery of the burner tube 4,
A connecting device 7 for a gas conduit 6 is provided on the side of the gas chamber 5 on the fan casing 2 side. The connecting device 7 has an opening 8 at one end opened into the gas chamber 5 as a gas inlet, an insertion opening 9 for the gas conduit 6 at the other end, a connecting tube 11 provided with a locking screw 10, and a seal. It consists of an inserted part 6' formed at the distal end of the gas conduit 6 to which a ring 12 is attached and a locking groove 13 is provided. Further, an annular mixing chamber 14 is provided in the burner tube 4 facing the inner wall of the tube, an air passage is formed inside the mixing chamber 14, and a tapered shape connected to the tip edge of the burner tube 4 is provided in front of the mixing chamber 14. A burner port 15 is formed, and a large number of burner ports 16 are provided in the burner port 15. A large number of air holes 18 are provided in the rear wall 17 of the mixing chamber 14 at equal intervals around the entire circumference. Further, in the portion of the burner tube 4 facing the gas chamber 5 and the mixing chamber 14, a large number of gas outlet holes 19 are provided at equal intervals. Reference numeral 20 denotes a holder metal fitting that supports and fixes an electrode insulator 21 of an ignition electrode and a nozzle adapter 22 constituting the ignition device, and a plurality of mounting legs 23 provided integrally with the holder metal fitting 20.
is fixed to the inner surface of the burner tube 4 to hold the electrode insulator 21 and the nozzle adapter 22 at appropriate positions inside the burner tube 4. 24 is an oil fuel spray nozzle screwed onto the nozzle adapter 22, and 25 is an oil conduit connected to the nozzle adapter 22 by a nut 26. Reference numeral 28 denotes a pilot gas conduit having one end opened to the gas chamber 5 and the other end opening 29 passing through the mixing chamber 14 and opening downward from above the nozzle 24 . A pair of ignition electrodes 30 are arranged at an intermediate position. Reference numeral 31 denotes a flame stabilizing plate provided upstream of the flame port 15 and downstream of the spray nozzle 24 in the air passage.In the center of the flame stabilizing plate, a spout 32 and a swirling blade 33 cut up around the flame stabilizing plate are provided. 34 is a detector consisting of a CDS or the like for flame detection. Also, an opening 35 of the pilot gas conduit 28 to the gas chamber 5
is the opening 8 of the connecting tube 11 which becomes the gas inlet of the gas chamber 5.
On the other hand, the opening 35 is provided at the shortest position than the other gas outlet holes 19, and the diameter of the opening 35 is larger than that of the gas outlet hole 19, and the opening diameter a of the gas outlet hole 19' adjacent to the opening 35 is larger than that of the gas outlet hole 19. is larger than the diameter b of the other gas outlet holes 19.

The present invention has the above-described configuration. During oil combustion, the fuel oil sprayed from the spray nozzle 24 mixes with the blowing air supplied in a swirling manner via the swirling blades 33, and this mixed fuel generates a spark at the ignition electrode 30. The mixture is ignited to form a combustion flame, and the air blown from the air hole 18, through the mixing chamber 14, and from the flame port 16 of the flame port portion 15 becomes secondary air, and the above-mentioned combustion is carried out smoothly. In gas combustion, the supplied gas is sent to the mixing chamber 14 through the gas outlet hole 19, mixed with air blown from the air hole 18 in the chamber, and the mixture is released from the flame port 16 of the flame port section 15. The mixture is ignited and burned by a pilot flame formed in the opening 29 of the pilot gas conduit 28.
On the other hand, the air swirled and sent by the swirling blades 33 in the air passage becomes secondary air and is sufficiently mixed with the secondary air, resulting in a good combustion flame formed at the flame port 16. Become. By the way, in this type of pilot ignition type gas burner, the air-fuel mixture is
If a pilot flame is not formed when the gas is ejected, smooth flame transfer cannot be achieved. Since the diameter is larger than the hole diameter, the gas inflow resistance into the pilot gas conduit 28 is smaller than that of the gas outlet hole 19. Therefore, the gas flowing into the gas chamber 5 is smoothly sent to the pilot gas conduit 28 without delay, so that the pilot The flame does not form later than the ejection of the air-fuel mixture, and the flame transfers smoothly to the air-fuel mixture. Furthermore, if the diameter of the opening 35 of the pilot gas conduit 28 is made larger than the diameter of the gas outlet hole 19 as described above, the amount of gas flowing into the mixing chamber 14 from the gas outlet hole 19' adjacent to the opening 35 will be reduced to the opening 35. Under the influence of the inflowing gas flow, the amount of gas is reduced compared to the amount of gas flowing in from other gas outlet holes 19, and therefore the gas concentration distribution in the mixing chamber 14 becomes uneven, and the combustion flame is also uneven. Become something. In contrast, in the present invention, the gas outlet hole 1 adjacent to the opening 35
Since the opening diameter of the opening 9' is made larger than the diameter of the other gas outlet holes 19' to facilitate the inflow of gas from the outlet hole 19', the gas concentration in the mixing chamber 14 becomes uniform and the combustion flame is also reduced. It will be balanced. In addition, with this configuration, the amount of gas flowing in from the gas outlet hole 19' is made larger than the amount of gas flowing in from the other gas outlet holes 19, so that the air-fuel mixture blows out from a part of the flame port that becomes the ignition part of the pilot flame. It is also expected that the gas concentration will increase and the transfer of fire to the air-fuel mixture will be significantly improved.

Therefore, as described above, according to the present invention, there is no need to configure the pilot gas pipe as a branch from the gas pipe, so the piping of the gas passage does not become complicated, and there is no need for a control device for this purpose. Therefore, it is possible to provide a gas burner that is inexpensive in terms of cost, and has various beneficial effects such as a well-balanced combustion flame.

[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 line AA in FIG. 1. 2...fan casing, 4...burn tube, 5...gas chamber, 14...mixing chamber, 15...flame port, 19...gas outlet hole, 28...pilot gas conduit, 35...opening.

Claims (1)

[Scope of utility model registration request] An annular mixing chamber is formed in the burner tube connected to the fan casing and communicates with the gas chamber through a gas outlet hole, and a flame port is provided in front of the mixing chamber and a flame port is provided in the vicinity of the flame port. The pilot gas conduit is opened into the gas chamber, and the ignition device is disposed in the opening, and the pilot gas conduit is made to have a diameter larger than the opening diameter of the gas outlet hole, and the pilot gas conduit is opened into the gas chamber, and the gas outlet adjacent to the opening is opened into the gas chamber. A gas burner characterized in that the opening diameter of the hole is larger than that of other outlet holes.