JPH0996403A - Burner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the generation of noise caused by secondary air while reducing the size of a burner for a more compact device and holding a more proper temperature of a vaporizing cylinder. SOLUTION: A plurality of small holes 10 are provided at the outer periphery area of a vaporizing cylinder fixing board 5 so that they may be placed along the outer edge of a vaporizing cylinder 7 and a combustion ring 18 while a metal net 11 is stretched so as to cover the small holes in structure. This construction makes it possible to delay the velocity of a secondary air when passing through the small holes 10 and thereby prevent the generation of a noise since the metal net 11 is stretched over the small holes 10 to provide resistance. Since the small holes 10 are laid out along the outer edge of the vaporizing cylinder 7 and the combustion ring 18, there is no need to enlarge the outside shape of the vaporizing cylinder fixing board 5 so that a more compact burner may be designed. Furthermore, the air passing through the small holes 10 is capable of cooling effectively the vaporizing cylinder and the combustion ring 18 and controlling the received amount of heat and holding the temperature of the vaporizing cylinder 7 uniformly and properly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion device used in an oil heater or the like.

[0002]

2. Description of the Related Art A conventional combustion device will be described with reference to FIGS. The burner motor 2 is attached to the bottom of the burner case 24.
5 is attached to the rotary shaft 2 of the burner motor 25.
A fan 27 for sending combustion air is attached to 6 to form a blower block. Burner case 2
4, a vaporization tube fixing plate 28 is fixed, and further, a vaporization tube 30 is attached to the vaporization tube fixing plate 28 via a vaporization tube packing 29.
Are fixed and form a vaporization mixing chamber 31. A primary air port 32 for supplying combustion air and fuel is provided in the central portion of the vaporization cylinder fixing plate 28, and a small hole 33 equivalent to about 4 mm is provided further on the outer peripheral portion of the installation portion of the vaporization cylinder packing 29. 4, a plurality of secondary air passages are provided, and secondary air is supplied to the secondary air passage 34 formed by the vaporizing cylinder 30 and the burner case 24 through the small holes 33.

Reference numeral 35 denotes a nozzle, which is arranged so that its tip faces the vaporization and mixing chamber 31. Reference numeral 36 denotes a rotor, which is attached to the rotary shaft 26 of the burner case 25 with a constant distance from the tip of the nozzle 35. A mixing plate 37 is attached to the tip of the rotary shaft 26. A flame holding plate 39 having a flame hole 38 and a combustion ring 40 are fixed to the tip of the vaporization cylinder 30.

The operation of the above configuration will be described.
The heater 41 embedded in the vaporization cylinder 30 is energized to vaporize the vaporization cylinder 30.
Is heated. At the same time when the temperature of the vaporization cylinder 30 reaches a certain temperature, the burner motor 25 is started, and the combustion air is sent from the fan 27 through the primary air port 32 to the vaporization mixing chamber 31. Then, the liquid fuel sent by the pump 42 is guided to the nozzle 35 via the oil sending pipe 43. The liquid fuel discharged from the tip of the nozzle 35 is shaken off by the rotating rotor 36 and atomized. The atomized liquid fuel is mixed with the combustion air by the mixing plate 37, hits the vaporization surface 44 of the vaporization cylinder 30, and is vaporized. The vaporized liquid fuel is further ejected from the flame holes 38 while being mixed with the combustion air, and is ignited by the high pressure discharge by the electrode 45 to form a flame 46 to continue the combustion. When the combustion becomes stable, the energization of the heater 41 embedded in the vaporization cylinder 30 is stopped, and thereafter the vaporization cylinder 30 partially retains the heat generated from the flame 46 in the flame holding plate 39 and the combustion ring 40.
Receive heat through.

A part of the air supplied by the fan 27 is supplied to the secondary air passage 34 through a small hole 33 provided in the outer peripheral portion of the vaporization tube fixing plate 28. Small hole 3
The air that has passed through 3 collides with the outer walls of the vaporizing cylinder 30 and the combustion ring 40 to cool them, adjust the heat receiving temperature, and maintain the vaporizing cylinder 30 at an appropriate temperature. The air passes through the secondary air passage 34 and is supplied as secondary air from a large number of holes 40a in the outer peripheral portion of the combustion ring 40 so that the flame 46 is completely combusted. The amount of secondary air is adjusted by the total area of the small holes 33 provided in the outer peripheral portion of the vaporization tube fixing plate 28.

[0006]

However, in the above-mentioned conventional structure, since the small holes 33 provided in the outer peripheral portion of the vaporization tube fixing plate 28 are circular and the area per one is small, the secondary air is reduced. When passing through, a passing noise was generated, which was a cause of increasing the operating noise of the equipment.

As a method of preventing the sound generated when the secondary air passes, the diameter of the small hole 33 provided on the outer periphery of the vaporization tube fixing plate 28 may be increased. In order to increase the size, it is necessary to simultaneously increase the outer peripheral shape of the vaporization tube fixing plate 28, which increases the size of the entire burner, which becomes a factor against the compact design of the burner. Further, if the diameter of the small holes 33 is increased, the total area is adjusted to decrease the number, and the combustion ring 40 and the outer wall of the vaporization cylinder 30 near the small holes are easily cooled, so that the temperature is low and the distance is high. However, the temperature difference of the vaporization cylinder 30 in the circumferential direction becomes large, and it becomes difficult to uniformly adjust the temperature. Then, the vaporization of the low temperature portion of the vaporization surface 44 becomes insufficient, which also causes tar adhesion.

It is an object of the present invention to eliminate the above-mentioned drawbacks, to make the burner compact, to keep the vaporization cylinder temperature proper, and to prevent the generation of noise due to secondary air.

[0009]

In order to achieve the above object, the present invention provides a vaporization cylinder for vaporizing a liquid fuel and mixing it with combustion air, and a flame holding plate for combusting a mixed gas downstream of the vaporization cylinder. A combustion ring having a tubular shape surrounding the flame holding plate and fixed to the tip of the vaporization cylinder, and a burner case provided so as to surround the vaporization cylinder and the combustion ring, and the vaporization cylinder and the combustion ring. 2 spaces between the burner case and
The auxiliary air for combustion is made to flow as a secondary air passage, and a plurality of small holes for supplying air to the secondary air passage are provided in the vicinity of the vaporizing cylinder, and a wire mesh is attached so as to cover the small holes. .

[0010]

According to the present invention, with the above construction, a wire mesh is attached to the small holes provided on the outer periphery of the vaporization cylinder fixing plate to provide resistance, and the flow velocity of the secondary air passing through the small holes is reduced to generate a sound. Can be prevented. Further, since the small holes are provided along the outer edges of the vaporizing cylinder and the combustion ring, it is not necessary to enlarge the outer shape of the vaporizing cylinder fixing plate, and the burner can be designed compactly. Further, the air that has passed through the small holes can cool the outer wall of the vaporizing cylinder and the combustion ring, adjust the heat receiving temperature, and keep the temperature of the vaporizing cylinder uniform and proper in the circumferential direction.

[0011]

Embodiments of the present invention will be described below with reference to FIGS. A burner motor 2 is attached to the bottom surface of the burner case 1, and a fan 4 for feeding combustion air is attached to a rotary shaft 3 of the burner motor 2 to form a blower block. A vaporization tube fixing plate 5 is fixed to the burner case 1. Further, a vaporization tube 7 is fixed to the vaporization tube fixing plate 5 via a vaporization tube packing 6 and a vaporization mixing chamber 8
Is formed.

A primary air port 9 for supplying combustion air and fuel is provided in the central portion of the vaporizing cylinder fixing plate 5, and the outer peripheral portion of the installation portion of the vaporizing cylinder packing 6 is shown in FIG. As described above, a plurality of small holes 10 are provided along the outer edge of the vaporization cylinder 7, and a wire net 11 is attached so as to cover the small holes 10. Then, the secondary air is supplied to the secondary air passage 12 formed by the vaporizing cylinder 7 and the burner case 1 through the small holes 10.

Reference numeral 13 denotes a nozzle, which is arranged so that its tip faces the vaporization and mixing chamber 8. Reference numeral 14 denotes a rotor, which is attached to the rotary shaft 3 of the burner motor 2 with a constant distance from the tip of the nozzle 13. A mixing plate 15 is attached to the tip of the rotary shaft 3. Flame hole 1 at the tip of vaporization tube 7
A flame holding plate 17 having 6 and a combustion ring 18 are fixed.

The operation of the above configuration will be described.
The heater 19 embedded in the vaporization cylinder 7 is energized to heat the vaporization cylinder 7. At the same time when the temperature of the vaporization cylinder 7 reaches a certain temperature, the barber motor 5 is started, and combustion air is sent from the fan 4 through the primary air port 9 to the vaporization mixing chamber 8. The liquid fuel sent by the pump 20 is fed by the oil feed pipe 2
It is guided to the nozzle 13 via 1. The liquid fuel discharged from the tip of the nozzle 13 is shaken off and atomized by the rotating rotor 14. The atomized liquid fuel is mixed with the combustion air by the mixing plate 15, hits the vaporization surface 22 of the vaporization cylinder 7, and is vaporized. The vaporized liquid fuel is further mixed with the combustion air and ejected from the flame holes 16 and ignited by the high pressure discharge by the electrode 23 to form a flame 24 to continue the combustion.

A part of the air supplied by the fan 4 is a small hole 10 provided on the outer peripheral portion of the vaporization tube fixing plate 5.
Through the secondary air passage 12 and is supplied as secondary air from the outer peripheral portion of the combustion ring 18 so that the flame 24 is completely combusted. Since the wire net 11 is attached to the small hole 10 provided on the outer peripheral portion of the vaporization tube fixing plate 5 to provide resistance, the flow velocity of the secondary air when passing through the small hole 10 is slowed to generate a sound. Can be prevented.

When the combustion is stabilized, the energization of the heater 19 embedded in the vaporizing cylinder 7 is stopped, and thereafter, the vaporizing cylinder 7 has a flame 24.
Part of the heat generated from the heat is received through the flame holding plate 17 and the combustion ring 18. However, if the vaporization cylinder 7 receives a large amount of heat as it is and the vaporization cylinder 7 reaches an appropriate temperature or higher, the small hole 10 provided in the vaporization cylinder fixing plate 5 causes the vaporization cylinder 7 and the combustion ring 18 to have outer edges. Since it is provided along the direction,
The air that has passed through the small holes 10 hits the vaporization cylinder 7 and the outer wall of the combustion ring to efficiently cool them and adjust the amount of heat received. Therefore, the temperature of the vaporization cylinder 7 can be appropriately maintained by adjusting the relative positions of the small holes 10 and the outer edges of the vaporization cylinder 7 and the combustion ring 18. Further, since a plurality of small holes 10 can be uniformly formed in the circumferential direction, the vaporizing cylinder 7
The temperature in the circumferential direction can be made uniform. In addition, 2
The amount of secondary air is adjusted by the total area of the small holes 10 provided in the outer peripheral portion of the vaporization tube fixing plate 5.

[0017]

As described above, according to the present invention, a wire mesh is attached so as to cover the small holes provided on the outer periphery of the vaporization tube fixing plate to provide resistance, so that the flow velocity of the secondary air passing through the small holes can be improved. It is possible to prevent the sound from being delayed. Further, since the small holes are provided in the direction along the outer edges of the vaporization cylinder and the combustion ring, it is not necessary to enlarge the outer shape of the vaporization cylinder fixing plate, and the burner can be designed compactly. Further, since the small holes are provided along the outer wall of the vaporization tube fixing plate, the air that has passed through the small holes efficiently cools the vaporization tube and the combustion ring, and the temperature of the vaporization tube is kept uniform and proper in the circumferential direction. be able to.

[Brief description of drawings]

FIG. 1 is a sectional view of a combustion apparatus according to an embodiment of the present invention.

FIG. 2 is a plan view of a main portion having a small hole portion of the combustion device.

FIG. 3 is a sectional view of a conventional combustion device.

FIG. 4 is a plan view of a main portion having a small hole portion of the combustion device.

[Explanation of symbols]

 1 Burner Case 7 Vaporizing Cylinder 10 Small Hole 12 Secondary Air Passage 17 Flame Retaining Plate 18 Combustion Ring

Claims (1)

[Claims] 1. A vaporization tube for vaporizing liquid fuel and mixing it with combustion air, a flame holding plate for burning a mixed gas downstream of the vaporization tube, and a flame holding plate surrounding the flame holding plate and fixed to the tip of the vaporization tube. And a burner case provided so as to surround the vaporization cylinder and the combustion ring, and a space sandwiched between the vaporization cylinder and the combustion ring and the burner case is provided.
Combustion device in which auxiliary air for combustion is made to flow as a secondary air passage and a plurality of small holes for supplying air to the secondary air passage are provided in the vicinity of the vaporizing cylinder, and a wire mesh is attached so as to cover the small holes. .