JP2507098B2 - Combustion device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion apparatus used for a water heater, a heater, etc. in a home.

2. Description of the Related Art Conventionally, this type of combustion device has a structure as shown in FIG.

That is, 1 is a heater, 2 is a vaporization tube, 3 is a vaporization tube lid,
4 is a flame hole plate, 5 is a flame hole net, 6 is a flame hole cap, 7 is a rotor, 8 is a swing plate, 9 is a mixing blade, 10 is a fuel supply pipe, 11 is a heat insulating material, 12 is a combustion fan, 13 is A motor, 14 is a fuel supply pump, 15 is an oil receiving tank, and 16 is a vaporization surface.

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 shake-off plate 8, the mixing blade 9, and the combustion fan 12 rotate. On the other hand, fuel is pumped from the oil receiving tank 15 by the fuel supply pump 14,
Due to the centrifugal force of the rotor 7 and the swing-off plate 8 which rotate when supplied onto the rotor 7 via the fuel supply pipe 10,
It is evenly scattered and atomized from the outer peripheral portion of the swing-off plate 8.
The atomized fuel is the vaporization surface of the inner wall of the vaporized cylinder 2 that is heated.
The gas is vaporized in 16 and mixed with the combustion air supplied by the combustion fan 12 to form a mixture. The air-fuel mixture is further uniformly mixed by the rotating mixing blades 9 and is ejected from the flame hole net 5 through the vaporizing cylinder lid 3 and the flame hole plate 4, and is ignited and burned by ignition extinction (not shown).

After that, the heat of the combustion flame 17 is received by the outer peripheral upper end of the vaporization cylinder 2 and the upper surface of the vaporization cylinder lid, and is transmitted to the vaporization surface 16 to promote vaporization, so that the energization of the heater is stopped.

However, in such a structure, since the combustion air is introduced into the vaporization cylinder 2, a large amount of the combustion air is generated in the vaporization cylinder 2 in order to obtain a large combustion capability. However, there is a problem that the vaporization surface 16 is cooled and the fuel cannot conversely vaporize. Therefore, in order to obtain a large capacity, the vaporization cylinder 2
If the amount of combustion air flowing into the inside is reduced, the mixture of vaporized fuel and combustion air becomes incomplete, and if the combustion state becomes excessive air, a local lift of the combustion flame 17 occurs, and if the air becomes insufficient, combustion occurs. There was a problem that a yellow fire was generated in the flame 17 and, as a result, exhaust gas characteristics were deteriorated due to the generation of carbon monoxide or soot.

Therefore, the present invention promotes the mixing of the vaporized fuel and the combustion air, and evenly disperses the air-fuel mixture with respect to the flame hole net to prevent the lift of combustion flame and the occurrence of yellow fire,
The purpose is to obtain good exhaust gas characteristics.

Means for Solving the Problems In order to achieve the above object, the present invention provides a mixing promoting plate in a mixing chamber, and a surface is arranged on the downstream side of a mixing gas inlet of the mixing chamber so as to face the mixing gas inlet. In addition, it is provided at a position larger than the opening area of the mixture inlet of the mixing chamber and covering the mixture inlet with a gap.

Effect The combustion device of the present invention has the above-described configuration, in which the gas mixture of the vaporized fuel and the combustion air collides with the mixing promotion plate and promotes the mixing when the mixed gas diffuses along the mixing promotion plate, resulting in excellent exhaust gas characteristics. Is obtained. Moreover, since the air-fuel mixture can be uniformly dispersed in the flame holes, a uniform combustion flame can be formed and the exhaust gas characteristics can be improved.

Embodiment An embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, 18 is a vaporizer having a heater 19 built-in, and an air-fuel mixture outlet 20 is provided on the upper portion of the vaporizer 18.
An air inlet 21 for vaporization is provided in the lower part thereof. Through the vaporizing air inlet 21, a shaker plate 22 using a flat disc and a conical rotor 23 are provided in the vaporizer 18. The swing plate 22 and the rotor 23 are connected to the motor shaft 24 and the motor 25. One end of the fuel supply pipe 26 is close to the lower side surface of the rotor 23 with a gap, and the other end is connected to the fuel supply pump 27.
It is connected to the. A vaporization air chamber 28 is placed around the motor 25.
Is provided, and a vaporization air inlet 29 is provided in a part thereof. A vaporizer cover 31 is provided around the vaporizer 18 with a heat insulating material 30 interposed therebetween. Insulation 30 and carburetor cover 31
A gas mixture outlet 20 and a vaporizing air inlet 21 are provided through the above. An air passage 33 communicating with a blower 32 is provided around the vaporizer cover 31 and the vaporizing air chamber 28. Mixer outlet 20 of carburetor 18 and carburetor cover around it
A mixing chamber 35, which is provided above 31 with a gap, is isolated from the carburetor 18 via a transfer air passage 34 that communicates with the air passage 33. At the bottom of the mixing chamber 35, a gas mixture inlet 36 is provided at a position facing the gas mixture outlet 20 of the vaporizer 18. Inside the mixing chamber 35, a plate-shaped mixing promotion plate 37 is provided above the mixture inlet 36 so as to face the mixture inlet 36 and the mixture outlet 20. Further, the mixing promotion plate 37 forms a surface in a direction perpendicular to the mixture inlet 36 and the mixture outlet 20,
The air-fuel mixture inlet 36 and the air-fuel mixture outlet 20 are provided via a gap 37a. The mixing promotion plate 37 is provided with a diameter larger than the opening diameters of the mixture inlet 36 and the mixture outlet 20. Mixing chamber
A flame hole 39 divided by a plurality of secondary air ejection passages 38 is provided on the upper portion of 35. Secondary air ejection passage 38
Is provided so as not to communicate with the mixing chamber 35.
And a secondary air passage 40 which is provided around the air passage 33 and communicates with the air passage 33 and the transport air passage 34. A plurality of secondary air ejection holes 41 are provided in the upper portion of the secondary air ejection passage 38. 42 is a combustion flame. 43 is vaporizing air, 44 is carrier air, and 45 is secondary air.

Next, the operation of the configuration of this embodiment will be described.
First, when the fuel supply pump 27 is operated, fuel is supplied to the rotor 23 via the fuel supply pipe 26 and rises along the conical side surface of the rotor 23 rotating via the motor shaft 24 by the rotation of the motor 25. , Is atomized and scattered from the shake-off plate 20, and is vaporized on the side wall heated by the heater 19 of the vaporizer 18.
This vaporized gas is vaporized by the vaporizing air 43 that has flowed from the air passage 33 into the vaporizing air chamber 28 through the vaporizing air intake 29.
It is carried out of the air-fuel mixture outlet 20 by flowing in from the vaporizing air inlet 21 of 18. Most of the air rises from the blower 32 in the air passage 33 and is divided into carrier air 44 and secondary air. The transfer air 44 flows from the transfer air passage 34 into the mixture inlet 36 of the mixing chamber 35 together with the mixture carried out from the mixture outlet 20 of the carburetor 18, and then to the mixing promotion plate 37.
And the air-fuel mixture collide at the same time to promote mixing,
It rises in the mixing chamber 35, reaches the flame hole 39, is ignited by an igniter (not shown), and burns. On the other hand, secondary air 45
Rises around the mixing chamber 35, flows from the secondary air passage 40 into the secondary air ejection passage 38, ejects from the secondary air ejection hole 41, wraps around the combustion flame 42 formed in the flame hole 39, and the flame Shorten the length and promote high load combustion.

Then, a lift caused by non-uniform mixing due to an increase in air flow when the air is excessive in the combustion state and a yellow fire due to insufficient mixing when the air is insufficient cause a mixture of the air-fuel mixture and the transport air 44 to the mixing promotion plate 37. Then, by diffusing each of them in the gap 37a, it is possible to promote uniformization of mixing and prevent lift and yellow fire. Further, since the mixture promoting plate 37 prevents the mixture and the conveying air 44 from rising straight, the combustion flame 42 on the flame holes 39 is prevented from rising, and the distribution of the combustion flame 42 is made uniform and short. Can be formed into flame. By improving the exhaust gas characteristics of the combustion flame 42, the stable combustion area can be expanded, and the fuel supply pump
It is possible to easily manage the variation of 27 and the blower 32. Further, since the diameter of the air-fuel mixture promoting plate 37 is set to be larger than the opening diameter of the air-fuel mixture inlet 36, all the transporting air 44 rising so as to wrap the air-fuel mixture collides with the air-fuel mixture promoting plate to further promote the mixing. be able to.

As described above, according to the present invention, since the mixing promoting plate is provided in the mixing chamber so as to face above the mixture inlet of the mixing chamber and the mixture outlet of the vaporizing cylinder, the mixture and the conveying air are simultaneously provided. By colliding with the mixing promotion plate, mixing is promoted, lift of the combustion flame generated when excess air in the combustion state and yellow flame generated when the air is insufficient can be prevented, and a stable combustion range can be expanded. In addition, since the flow of the air-fuel mixture and the air for conveyance that rises in a straight line are interrupted by the mixing promotion plate, the air-fuel mixture and air for transportation spread to the peripheral wall of the mixing chamber, and the distribution of combustion flame is made uniform to shorten the flame be able to.

[Brief description of drawings]

FIG. 1 is a sectional view of a main part of a combustion apparatus according to an embodiment of the present invention, and FIG. 2 is a partial sectional view of a conventional combustion apparatus. 18 ... Vaporizer, 20 ... Mixture outlet, 34 ... Transport air passage, 35 ... Mixing chamber, 36 ... Mixture inlet, 37 ... Mixing promotion plate, 37a ... Gap, 39 ... Flame Hole.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hideo Tomita 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) Reference JP-A-63-73009 (JP, A) Actual development Sho-53- 67929 (JP, U) Actually opened Sho 60-101527 (JP, U)

Claims (1)

(57) [Claims] 1. A vaporizer for vaporizing fuel, a gas mixture outlet provided in a part of the vaporizer, a mixing chamber provided downstream of the gas mixture outlet via a carrier air passage, and a mixture chamber. An air-fuel mixture inlet provided at a position facing the air-fuel mixture outlet in a part of the chamber, is provided on the downstream side of the air-fuel mixture inlet inside the mixing chamber, and is formed larger than the opening area of the air-fuel mixture inlet, A mixing promotion plate provided at a position facing the air-fuel mixture inlet, a gap provided between the mixing promotion plate and the air-fuel mixture inlet,
And a flame hole provided on the downstream side of the mixing chamber.