JP2847903B2 - Combustion equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a petroleum-fueled gasification type combustion apparatus provided with a flashback detector.

2. Description of the Related Art A conventional vaporization type combustion apparatus of this type is configured as shown in FIG.

1 is a heater, 2 is a vaporizing cylinder, 3 is a vaporizing cylinder lid, 4 is a flame port plate, 5 is a flame port net, 6 is a flame port cap, 7 is an inverted conical rotor, 8 is a shake-off plate, and 9 is a mixing blade. Reference numeral 10 denotes a refueling pipe, 11 denotes a refueling nozzle which is opened slightly in the vicinity of the rotor 7, 12 denotes a combustion fan, 13 denotes a motor, 14 denotes a refueling pump, and 15 denotes a fuel tank.

When the heater 1 is energized and the vaporization cylinder 2 rises to a predetermined temperature, the motor 13 is driven, and the rotor 7, the swing-off plate 8, the mixing blade 9, and the combustion fan 12 rotate. On the other hand, fuel is pumped from a fuel tank 15 by a refueling pump 14 and discharged onto the outer peripheral surface of the rotor 7 through a refueling pipe 10 and a refueling nozzle 11, conveyed upward by the rotating rotor 7, and It is scattered and atomized from the part. The atomized fuel is vaporized on the heated inner wall of the vaporizing cylinder 2 and is mixed with the primary air for combustion supplied into the vaporizing cylinder by the combustion fan 12 to form an air-fuel mixture. The air-fuel mixture is uniformly mixed by the rotating mixing blades 9, ejected from the flame net 5 through the vaporization cylinder lid 3 and the flame plate 4, ignited by an igniter (not shown), and burned.

SUMMARY OF THE INVENTION However, in the above-described configuration, an abnormal temperature rise (red heat) due to deformation of the flame net 5 due to long-term use and variations in equipment, and use in a strong wind or combustion for dust clogging. Due to the flashback due to the blockage of the next air, the combustion flame passes through the flame port net 5 and enters the flame port plate 4 and the vaporizing cylinder 2. Therefore, there is a problem that normal combustion cannot be maintained due to damage inside the vaporization cylinder 2 due to heat and clogging of the flame port net 5 by soot.

Therefore, the present invention, even if the combustion flame flashes back in the carburetor,
An object of the present invention is to obtain a flashback detector that can stop the combustion device by detection and prevent internal damage.

Means for Solving the Problems In order to solve the above-mentioned problems, a combustion device of the present invention is provided with a flashback detector at a position avoiding the passage of vaporized gas and flashback flame in a vaporizer and a mixing chamber. It is.

The flashback detector of the combustion device according to the present invention has the above-described configuration, and detects when the combustion flame passes through the flame opening and enters the transfer air passage from the mixture air inlet of the mixing chamber to stop the combustion device. , To prevent equipment damage. Further, the detection accuracy of the flashback detector is stabilized, and the detection is always maintained.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the present embodiment, two vaporization / combustion paths are provided in the main body, but one side will be mainly described for simplification of the description. In FIG. 1, reference numeral 18 denotes a main body which is divided into a vaporized air chamber 21, a primary air chamber 22, and a secondary air chamber 23 by a burner base 19 and a partition plate 20. A primary air vent 24 and a vaporized air port 25 are opened in the burner base 19, and a vaporizer 26 is mounted above the vaporized air port 25. The vaporizer 26 has a vaporized air inlet 27 at the bottom, a heater 28 embedded in the side wall, and a plurality of mixture outlets 29 at the upper opening. The outside of the vaporizer 26 is covered by a vaporizer cover 30 via a heat insulating material. Inside the vaporizer 26, there is provided an atomizing disk 31 placed substantially horizontally, and a hollow inverted conical rotary cup 32 integrally attached to the lower surface of the disk 31 with a small gap therebetween, which is rotated by a motor 33. You. On the other hand, the refueling nozzle 34 penetrates the vaporized air port 25 from below and is inserted into the inside of the rotatable cup 32 from the lower end opening thereof, and is opened near the inner peripheral wall near the lower end of the rotatable cup 32. 35 is a refueling pump. The partition plate 20 has an air-fuel mixture inlet 37 at a position facing the secondary air port 36 and the air-fuel mixture outlet 29, and a transfer air passage 38 is interposed between the partition plate 20 and the carburetor cover 30. Is provided. Above the mixture inlet 37, there is provided a mixing chamber 41 in which a mixing plate 39 and a flame port 40 are provided at the upper end. Further, the mixing chamber 41 is configured to narrow the opening in the vicinity of the mixture inlet 37. The flame opening 40 is made of a plurality of flame holes
42 and a plurality of secondary air passages 44, each of which has a plurality of secondary air ports 43 opened and communicates with the secondary air chamber 23 (communication portions are not shown), are formed alternately. Conveyance air passage
A backfire detector 45 for detecting the temperature of the thermocouple, thermistor, etc. is provided in the area 38 at a position avoiding the vaporized gas basin around the mixture mixture outlet 29 and the mixture mixture inlet 37 and the path of the backfire flame. ing. 46 is a tertiary air port, and 47 is a combustion fan which is opened substantially at the center of the bottom of the main body 18.

In the above configuration, the air supplied from the combustion fan 47 is divided into four routes. That is, first, the vaporized air port 25 and the vaporized air inlet 27 are supplied from the vaporized air chamber 21.
Vaporized air flowing into the vaporizer 26 via the The second is the primary air that flows into the mixing chamber 41 from the air flowing from the primary air port 24 into the primary air chamber 22 through the conveying air passage 38 and the air-fuel mixture inlet 37. Thirdly, of the air flowing into the secondary air chamber 23 from the secondary air port 36, the air flows into the secondary air path 44 of the flame port 40 and flows out from the secondary air port 43 to the vicinity of the flame hole plate 42. Next air. Fourth is tertiary air flowing out of the secondary air chamber 23 through a tertiary air port 46. The fuel is pumped up by the refueling pump 35 and discharged from the refueling nozzle 34 to the inner peripheral wall near the lower end of the rotating cup 32. The rotating cup 32 is a motor with the atomizing disk 31
The fuel that has been rotated by 33 and discharged to the inner peripheral wall of the rotating cup 32 is reliably transported upward along the inner peripheral wall by centrifugal force, and is provided between the upper end of the rotating cup 32 and the atomizing disk 31. Atomized in the circumferential direction from the gap. The atomized fuel is supplied from the outer edge of the atomizing disk 31 to the inner wall of the vaporizer 26 and becomes the vaporized gas. The vaporized gas mixes with the vaporized air supplied into the vaporizer 26 and flows upward from the mixture outlet 29 as a high-concentration mixture. The high-concentration air-fuel mixture flows into the mixing chamber 41 together with the primary air from the conveying air passage 38, is mixed by the mixing plate 39, and becomes an optimal and uniform air-fuel mixture for combustion, and flows out of the flame hole plate 42. Ignited by an igniter (not shown) and burned. On the other hand, the secondary air required for combustion is 2
The fuel is supplied from the secondary air port 43 of the secondary air passage 44 and complete combustion is performed.

Here, when flashback occurs due to thermal deformation of the flame port plate 42 due to long-term use of the combustion device, changes in setting conditions due to variations in equipment and deterioration of the use environment, and blockage of primary air in a strong wind, etc. The flame reaches the conveying air passage 38 from the mixture inlet 37 of the mixing chamber 41 through the flame plate 42. At this time, the combustion device is stopped immediately according to the instruction of the flashback detector 45 which has received the heat of the combustion flame, to prevent damage to the inside of the vaporizer 26 and the mixing chamber 41 and to prevent clogging of the flame mouth plate 42 by soot. Can be prevented.

Further, since the backfire detector 45 is provided in the conveying air passage 38, the combustion device can be stopped before the combustion flame enters the carburetor 26, and the inside of the carburetor 26 can be prevented from being stained with soot. . Further, since the flashback detector 45 is provided in the vicinity of the outer periphery of the mixture outlet 29 or the mixture inlet 37, it is in the flow of the primary air, and it is possible to prevent a detection error due to leakage of the vaporized gas. Further, by avoiding the path of the backfire in the conveying air passage 38, the backfire detector 45 can be prevented from being damaged, so that a stable detection state can be always maintained.

Effects of the Invention As is clear from the above description, the following effects can be obtained according to the vaporizer of the present invention.

(1) Since the flashback is detected by the flashback detector and the combustion device is stopped immediately, damage to the components such as the mixing chamber and the flame opening due to heat can be prevented.

(2) Since the flashback detector is provided in a part of the transfer air passage, the combustion device can be stopped before the combustion flame enters the carburetor, and damage due to heat inside the carburetor and contamination by soot can be prevented.

(3) Since the combustion device is immediately stopped by the flashback detector, it is possible to prevent clogging due to soot of the flame port plate.

(4) Since the flashback detector is provided at a position avoiding the path of the vaporized gas and the flame of the flashback, malfunction or damage of the flashback detector can be prevented, and stable detection can be maintained.

[Brief description of the drawings]

FIG. 1 is a sectional view of a combustion device according to an embodiment of the present invention, and FIG. 2 is a sectional view of a conventional combustion device. 26 …… vaporizer, 29 …… mixture outlet, 37 …… mixer inlet,
38 ... Transport air passage, 40 ... Flame port, 41 ... Mixing chamber,
45 ... Flashback detector.

──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Soichi Kitajima 1006 Kazuma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References JP-A-2-37204 (JP, A) -162474 (JP, U) (58) Fields studied (Int. Cl. ⁶ , DB name) F23N 5/02 343 F23D 11/40

Claims (1)

(57) [Claims] 1. A vaporizer, a gas mixture outlet provided in the vaporizer, a mixing chamber to which a vaporized gas from the vaporizer is supplied, and a gas mixture outlet of the vaporizer in the mixing chamber. The mixture inlet provided at the position, the flame port provided at the upper part of the mixing chamber, and the mixture outlet and the gas mixture basin of the mixture inlet provided at a position avoiding the path of the flame of the backfire. Combustion device provided with a selected flashback detector.