JP2000171007A - Burner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect the state of flame stably even when the minimum combustion is decreased in a burner where a tip nozzle mesh is fixed to the burner port of a tip nozzle tube constituting a burner and the periphery of the burner port is surrounded by a flame holder by making the burner port of the tip nozzle tube facing a frame rod larger than other burner ports. SOLUTION: When an oil heater is operated, a vaporizer is heated by a heater and liquid fuel pressure fed to a vaporizing tube is gasified and ejected toward the opening 20 of a mixing tube 12. At the same time, primary air is fed into the mixing tube 12 through suction effect incident to gas ejection and mixed gas is fed to a burner head 11. The mixture gas is ejected from a large number of burner ports 13 made under a tip nozzle tube 14 and applied tightly with a tip nozzle mesh 15 and then fired and combusted. Combustion is controlled by detecting a flame current by means of a frame rod 41, and detection accuracy is enhanced by making the burner port 13 facing the frame rod 41 larger than other burner ports.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for vaporizing a liquid fuel,
The present invention relates to a burner of a Bunsen-type combustion device for burning the vaporized gas.

[0002]

2. Description of the Related Art Conventionally, as a burner of this type of Bunsen type combustion apparatus, a burner of a combustion apparatus in which a vaporizing section and a burner section are integrated as shown in FIG. 6 has been proposed. That is, in this combustion device, the vaporized gas vaporized by the vaporizer 51 is jetted vertically from the nozzle 52, and the mixing pipe 5 formed integrally with the vaporizer 51 together with the primary air sucked at that time.
The above-mentioned vaporized gas is supplied into 3, and the vaporized gas and the primary air are mixed in the mixing pipe 53, and are ejected from the upper opening 54 of the mixing pipe into the cannulated burner cylinder 55. The mixture gas is turned downward so as to flow below the outer periphery of the mixing tube 53, and the mixed gas is ejected from a large number of flame holes 56 provided in the lower peripheral wall of the burner cylinder 55 and burns.

In such a combustion device, the mixed gas flows back and forth around the mixing pipe 53, and the mixed gas is uniformly ejected from a large number of flame holes 56 provided in the lower peripheral wall of the burner cylinder 55 for combustion. Is uniform, and the flame is ejected in the outer peripheral direction. This is achieved by providing a burner flame holding plate 57 on the outer periphery of the flame hole 56 so that the flame flows upward, thereby suppressing the lift of the flame.

[0004] Further, in the above-mentioned combustion device, as a safety device,
A flame rod 58 for detecting the state of the flame by detecting the flame current in the flame is provided on the outer periphery of the flame hole 56, and detects an abnormal value of the flame current when the flame of the burner 50 becomes abnormally large or small. By detecting, the combustion device is determined to be abnormal and the combustion device is stopped.

[Problems to be solved by the invention]

[0005] However, in the case of the above-mentioned combustion device,
The primary air is sucked together with the vaporized gas to form a mixed gas.
Since this mixed gas is turned downward in the burner cylinder 55, it receives internal resistance. In particular, when the minimum combustion amount is reduced in order to increase the combustion amount width, if the minimum combustion amount is not more than a certain value, the flame current is reduced, so that it is erroneously detected as a combustion abnormality, and combustion cannot be continued, There is a problem that it is difficult to further reduce the minimum combustion amount.

Accordingly, the present invention has been made in view of such circumstances,
It is an object of the present invention to provide a Bunsen-type combustion device burner that can stably detect the state of a flame even when the minimum combustion amount is reduced.

[0007]

According to the present invention, there is provided a vaporizer for heating and vaporizing a liquid fuel, and a crater in the form of a cantilever having a plurality of flame holes formed in a lower peripheral wall. A burner for burning the vaporized gas spouted and supplied from the vaporizer, a crater net mounted in close contact with a flame hole of the burner, a flame holding plate surrounding the periphery of the flame hole, and detecting a state of the flame. A burner of a Bunsen-type combustion device comprising: a flame rod of the crater cylinder facing the frame rod being larger than other flame holes. It is concerned.

[0008]

According to the above construction, since the flame hole of the crater facing the frame rod is larger than the other flame holes, the contact area between the flame and the flame rod increases, and the flame rod can be detected. Even when the flame current amount in the flame increases and the minimum combustion amount is reduced, the state of the flame can be detected stably.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS. As shown in FIG. 3, reference numeral 1 denotes a pulse-driven electromagnetic pump, which is disposed on the oil receiver 2. Reference numeral 3 denotes a vaporizer for heating and vaporizing the liquid fuel. The vaporizer comprises a vaporizing cylinder 5 containing a heater 4, a nozzle 8 opened and closed by a valve rod 7 movable by a solenoid 6, and a thermistor 9 for detecting the temperature of the vaporizer 3. I have. Further, the vaporizer 3 is provided such that the nozzle 8 at the tip thereof is directed to the opening 20 of the funnel-shaped cylindrical portion 21 of the mixing pipe 12, and communicates with the electromagnetic pump 1 via an oil supply pipe 22.

Reference numeral 10 denotes a burner comprising a burner head 11 and a mixing tube 12. As shown in FIG. 4, the burner head 11 has a crater 14 in the form of a cantilever having a plurality of flame holes 13 formed in a lower peripheral wall thereof. A crater net 15 attached to the flame hole 13 of the crater tube 14, a rectifying cylinder 16 having a cantilever shape formed along the inner peripheral wall of the crater tube 14, and a portion opposed to the rectifying cylinder 16. And a bottomless substantially conical body 18 having a communication port 17 formed therein.

The mixing tube 12 is formed of a curved tube 19 formed by curving a hollow pipe in a U-shape, and a funnel-shaped cylindrical portion 21 having an opening 20 with a relatively large area on one side. The burner 10 composed of the burner head 11 and the mixing pipe 12 is fixedly connected so that the end opening of the curved tube 19 and the central axis of the communication port 17 are the same.

1 and 2, reference numeral 23 denotes the burner head 11.
In the upper part of the burner 10, a heat radiating tube 24 having a large number of holes formed in the side circumference is suspended from the upper part of the burner 10. This is a transmission tube made of transparent heat-resistant glass.

Reference numeral 31 denotes a semicircular vertical reflector for radiating the radiant heat of the radiating tube 24 forward, and is provided so as to surround the transmitting tube 25. Reference numeral 32 denotes a gas passage communicating with the transmission tube 25 at substantially the center, and is formed by an upper partition plate 33 and a heat shield plate 34. 36 is a vertical reflector 31 and exterior 35
, And communicates with the gas passage 32.

Reference numeral 37 denotes a blower for taking indoor air into the body, 38 denotes an air outlet, 39 denotes a cartridge tank for supplying liquid fuel to the oil receiver 2, 40 denotes a spark plug, and 41 denotes a flame current in the flame. And a flame rod for detecting the state of the flame, as shown in FIG.
The diameter of the flame hole (A) 13A opposed to is large and the other flame holes 13 are small. The ignition plug 40 and the frame rod 41 are connected to the burner head 11 and the flame holding plate 23.
It is arranged between.

Next, the operation in the above configuration will be described. When the operation switch is turned on, the heater 4 is energized to heat the vaporizer 3. When the temperature of the vaporizer 3 detected by the thermistor 9 of the vaporizer 3 reaches a predetermined temperature, the electromagnetic pump 1 and the solenoid 6 are energized.

When the electromagnetic pump 1 and the solenoid 6 are energized, the liquid fuel is pressure-fed to the vaporizing cylinder 5 by the electromagnetic pump 1 and is vaporized by heating. Mixing tube 12
And the primary air is also squirted toward the opening 20 of the mixing pipe 12 by the suction effect of the squirting.
Flows into.

The vaporized gas and the primary air become a completely mixed gas while flowing through the curved cylinder 19, and become a mixed gas.
And flows into the burner head 11. Immediately after this, the flow direction of the mixed gas is forced to be changed by the flow straightening tube 16, distributed substantially uniformly in all circumferential directions and turned downward, and is ejected from a large number of flame holes 13 provided on the lower peripheral wall of the crater tube 14. The fuel is ignited by the ignition plug 40 to start combustion.

Here, with respect to the burner 10, the bending cylinder 19 is formed in a U-shape, and is connected so as to bend from a portion which is slightly lowered from the lower center of the burner head 11 directly below. Therefore, as shown in FIG. 1, the total vertical extension (L1)
Is much shorter than before, and the entire burner 10 is small. Further, since the total length of the mixing pipe 12 of the curved cylinder 19 is sufficiently long, the mixing of the vaporized gas and the primary air is sufficiently performed in the mixing pipe 12, so that good combustion can be performed.

When the combustion is started, the flame hole 1
A flame is formed in close contact with the surroundings, and the flame rod 41 detects the flame current generated by the flame to control the combustion. Here, since the diameter of the flame hole (A) 13A facing the frame rod 41 among the flame holes 13 is increased, the flame current of the flame contacting the frame rod 41 increases, and a stable flame current is detected. be able to. In particular, the flame current of the flame can be reliably detected at the minimum combustion amount when the combustion amount width is widened.

Further, from the heat radiating tube 24 heated by the flame and glowing red, the radiant heat is emitted to the room directly or reflected on the vertical reflecting plate 31. Further, the combustion product gas reaches the gas passage 32 from the permeation cylinder 25, mixes with the air supplied from the blower 37 via the air passage 36, and is discharged indoors from the outlet 38 while lowering the temperature.

[0021]

As described above, in the burner of the Bunsen-type combustor of the present invention, the flame hole of the crater tube facing the frame rod is larger than the other flame holes. Even when the amount of flame current is increased and the minimum amount of combustion is reduced, the state of the flame can be stably detected, so that a burner for a Bunsen-type combustion device capable of increasing the amount of combustion can be supplied.

[Brief description of the drawings]

FIG. 1 is a cutaway front view of a main part of a reflective oil heater according to an embodiment of the present invention.

FIG. 2 is a cutaway side view of a main part of the reflection type oil heater of the embodiment of the present invention.

FIG. 3 is a sectional view of a main part of a burner and a carburetor according to the embodiment of the present invention.

FIG. 4 is a sectional view of a burner according to an embodiment of the present invention.

FIG. 5 is a sectional view taken along line AA of FIG. 4;

FIG. 6 is a sectional view of a main part showing a conventional combustion device.

[Explanation of symbols]

 Reference Signs List 3 vaporizer 13 flame hole 14 crater tube 10 burner 15 crater net 23 flame stabilizer 41 frame rod

Claims (1)

[Claims] 1. A vaporizer for heating and vaporizing a liquid fuel, and a burner having a canister-shaped crater having a plurality of flame holes formed in a lower peripheral wall and burning a vaporized gas ejected and supplied from the vaporizer. And a crater net mounted in close contact with the burner flame,
In a burner of a Bunsen-type combustion device provided with a flame holding plate surrounding the periphery of the flame hole and a frame rod for detecting a state of the flame, the flame hole of the crater cylinder facing the frame rod has another flame hole. A burner for a Bunsen-type combustion device characterized by being larger than a flame hole.