JPH0221109A - Burner - Google Patents

Abstract

PURPOSE:To prevent the generation of back fire within a flame port plate by providing a fuel-air mixture air ejection passage where a plurality of porous flame ports are laid out, which eject mixed air into the upper part of a mixing chamber communicated with a primary air passage and a secondary air ejection passage which is provided with an inlet communicated with a secondary air passage in the end. CONSTITUTION:A primary air from a primary air passage 19 flows into a mixing chamber 22 through its fuel-air mixture inlet 23 with evaporated gas from an evaporated gas outlet 3 of an evaporation cylinder 1. Inside the mixing chamber 22, a control plate 24 promotes the mixing of both the primary air and the evaporated gas. The mixed air rises in the mixing chamber 22 and a mixed gasified air ejection passage 26. When the mixed air reaches a flame port 25, it is ignited by an igniter and burnt. On the other hand, a secondary air flows into a secondary air passage 21 passing through a secondary air straightening plate 20 from a branch section 18. It further flows into a secondary air ejection passage 28 from its inlet 29 and is ejected from the outlet 27 of the secondary air ejection passage 28, where the heat of the flame port 25 is released to the surrounding wall of the secondary air ejection passage 28 by way of the fuel-air mixture ejection passage 26 or directly.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a combustion device that vaporizes and burns liquid fuel.

BACKGROUND OF THE INVENTION A conventional combustion apparatus of this type was constructed as shown in FIG. 51 is a heater, 52 is a vaporizer cylinder with the heater 51 built in, and 53 is a vaporizer f! ? ifi, 54 is a flame hole plate disposed on the lid 53, 55 is a flame hole net provided on the outer peripheral surface of the flame hole plate 54, 56 is a flame hole cap, and 57 is arranged in the vaporizing cylinder 52. an inverted conical rotor; 58, a dividing plate installed on the upper surface of the rotor 57; 59, a mixing blade provided above the dividing plate 58; 60, a refueling pipe for supplying fuel to the rotor 57; 61; is the insulation material, 62 is the rotor 5
Combustion fan 63 is a mixing blade 59 installed below 7.
, rotor 57 , motor that drives the combustion fan 62 , 64
is a fuel pump, and 65 is a fuel tank.

The heater 51 is energized and the vaporizer cylinder 52 is heated to a predetermined temperature of -F.
When the temperature rises, the motor 63 is driven, and the rotor 57, the swinging plate 58, the mixing blade 59, and the combustion fan 62 rotate.

On the other hand, liquid fuel is supplied to the fuel tank 6 by the fuel pump 64.
The oil is pumped up from the rotor 5 through the oil supply vibro 0.
At the same time, it is uniformly scattered and atomized from the outer periphery of the dividing plate 58 by the centrifugal force of the rotating rotor 57 and the dividing plate 58. The atomized fuel is vaporized on the vaporization surface 66 of the heated inner wall of the vaporization cylinder 52, and is mixed with combustion air supplied by the combustion fan 62 to form an air-fuel mixture. The mixed metal gas is further uniformly mixed by the rotating mixing vane 59, and is ejected from the flame hole net 55 through the holes of the vaporizer F'j guide 53 and the holes of the flame hole plate 54, and is ejected from the flame hole net 55, and the igniter (see Fig. (not shown) ignites and burns.

Problems to be Solved by the Invention However, in this type of combustion device, when the flame formed in a wide area of the flame hole net 55 comes into close contact with the flame hole net 55, for example when the combustion amount is changed to a small value, the flame hole net As the temperature of the flame hole net 55 rises and becomes immature, there are problems such as deformation of the flame hole net 55 and backfire inside the flame hole plate 54, resulting in soot generation and damage to the structure. Ta.

The present invention solves such conventional problems, and provides a combustion device that can prevent the flame hole net from becoming red hot, prevent the flame hole from deforming, and prevent backfire inside the flame hole plate. With the goal.

Means for Solving the Problems In order to solve the above problems, the combustion apparatus of the present invention includes a mixing chamber provided above the liquid fuel vaporization means in communication with the primary air passage; A plurality of rows of air-fuel mixture injection passages each having porous flame holes for ejecting air-fuel mixture are placed between the air-fuel mixture injection passages, and a plurality of secondary air passages are arranged at the upper end of the air-fuel mixture injection passages. It has a spout hole and 2 at the end.
and a secondary air jetting passage having an inlet communicating with the secondary air passage.

Effect With the above configuration, even if the flame comes into close contact with the flame holes, the plurality of rows of air-fuel mixture jetting passages having flame holes are
The heat of the flame hole is removed by the secondary air jet passage, preventing the temperature of the flame hole from rising, and preventing deformation of the flame hole and backfire into the flame hole.

Example Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1 is a front sectional view of a combustion device showing an embodiment of the present invention, and FIG. 2 is a side sectional view of the same combustion device. In FIGS. 1 and 2, reference numeral 1 denotes a vaporizer cylinder with a built-in heater 2, a vaporized gas outlet 3 is provided in one part of the vaporizer cylinder 1, and a vaporization air inlet 4 is provided in the lower part. ing. A disc-shaped swinging plate 5 and an inverted conical rotor 6 are provided in the vaporizing cylinder 1 through which the vaporizing air 4 is passed. The swing-off temporary 5 and rotor 6 are fixed to a motor shaft 8 and driven by a motor 7. A fuel supply pipe 10 is placed close to the surface of the rotor 6 with a gap therebetween, and fuel oil is supplied by a fuel pump 9 . A vaporizing air chamber 11 is provided around the motor 7, and a vaporizing air intake port 12 is provided on the lower surface. Further, a vaporizer cover 1 is provided around the vaporizer cylinder 1 via a heat insulating material 13.
4 are provided.

An air passage 16 communicating with a combustion fan 15 is provided around the vaporizing cylinder cover 14 and the vaporizing air chamber 11. A branch part 18 is provided above the air passage 16 via an air baffle plate 17, and the air passage 16 is connected to a primary air passage 19 extending above the vaporized gas outlet 3 along the -L plane of the carburetor cover 14. , and a secondary air passage 21 extending upward via a secondary air baffle plate 20. Vaporizer cylinder 1 and rotor 6
Above the vaporizer, which consists of
A mixing chamber 22 is provided which has a mixture inlet 23 in its lower part which communicates with the secondary air passage 19, and a plate-shaped control plate 24 is provided at an internal position facing the mixture inlet 23. In the upper part of the mixing chamber 22, a plurality of rows of mixture jetting passages 26 each having a porous flame hole for spouting the mixture are arranged. A secondary air jetting passage 2 having a secondary air jetting hole 27 of
8 are arranged. This secondary air jetting passage 28 does not communicate with the mixing chamber 22, and the secondary air jetting passage inlet 29 provided at the end thereof communicates with the secondary air passage 21 located around the mixing chamber 22. There is. The porous flame hole 25 provided at the upper end of the mixture jetting passage 26 is bent to have a U-shaped cross section, and the secondary air jetting passage 28 provided around it is bent.
It is mounted along the outer wall of the secondary air jetting passage 28, and its upper end is located in substantially the same plane as the upper end of the secondary air jetting passage 28. 30 is a guide, 31 is a flame, 32 is a primary air flow, 33 is a secondary air flow, and 34 is a vaporizing air flow.

In the above configuration, during combustion, fuel oil is supplied to the rotor 6 via the oil supply pipe 10 by the operation of the oil supply pump 9,
The vaporizing surface 1a is atomized and scattered along the inverted conical outer surface of the rotor 6, which rotates via the motor shaft 8 due to the rotation of the motor 7, and is atomized and scattered. is vaporized. This vaporized gas is carried out to the vaporized gas outlet 3 by the vaporizing air flow that has flowed in from the air passage 16 through the vaporizing air intake 12 and the vaporizing air port 4 . On the other hand, most of the air rises through the air passage 16 through the combustion fan 15, passes through the air straightening plate 17, and passes through the branch section 1.
At 8, the air is divided into primary air and secondary air.

The primary air from the primary air passage 19 flows from the mixture inlet 23 of the mixing chamber 22 together with the vaporized gas from the vaporized gas outlet 3 of the vaporizer WJ1, and is controlled by the control plate 24 in the mixing chamber 22.
The mixture of the air and the vaporized gas is promoted, moves upward through the mixing chamber 22 and the mixture/vaporization jet passage 26, reaches the flame hole 25, is ignited by an igniter (not shown), and combusts. On the other hand, the secondary air passes through the secondary air baffle plate 20 from the branch part 18, flows into the secondary air passage 21, further flows into the secondary air jet passage 28 from the secondary air jet passage 29, and The next air is ejected from the air ejection hole 27. Since this secondary air is ejected in parallel with the air-fuel mixture ejected from the flame hole 25, the flame 31 that is about to expand is enveloped by the secondary air, shortening the flame length and promoting high-load combustion. .

If you reduce the amount of combustion in the combustion device or create an excess air condition, in the case of a conventional combustion device, the flame will enter the porous flame hole and heat the flame hole. , the temperature of the flame hole tends to rise until it becomes red-hot.

However, in this embodiment, the air-fuel mixture jetting passage 26 having the flame holes 25 is divided into a plurality of rows, and the secondary air jetting passage 28 is provided along between each row.
The heat passes through the air-fuel mixture injection passage 26 or directly,
The secondary air is released to the peripheral wall of the secondary air jetting passage 28 and is cooled by the secondary air passing therethrough. As a result, flame hole 25
This prevents the flame hole 25 from deforming itself and from backfiring into the air-fuel mixture jetting passage 26. Also, since sufficient secondary air can be supplied to the flame, the flame length is shortened and combustion is prevented. The area can be made compact.

Effects of the Invention As described above, the combustion apparatus of the present invention provides the following effects.

(1) Since the air-fuel mixture jetting passage having the flame hole is divided and the secondary air jetting passage is provided between them, the heat of the flame hole can be absorbed by the peripheral wall of the secondary air jetting passage, thereby preventing a rise in the temperature of the flame hole.

(2) Since the air-fuel mixture jetting passage having the flame hole is cooled by the secondary air passing through the secondary air jetting passage, deformation of the flame hole due to temperature rise can be prevented and it can withstand long-term use.

(3) Since the mixture jetting passage with the flame hole is cooled by the secondary air jetting passage and its secondary air, it is possible to prevent backfire into the mixture jetting passage due to the temperature rise of the flame hole, and the generation of soot. and damage to structures can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a sectional front view of a combustion device showing an embodiment of the present invention, FIG. 2 is a sectional side view of the same combustion device, and FIG. 3 is a sectional view of a conventional combustion device. 1... Vaporizer cylinder, 19... Primary air passage, 2... 2
Next air passage, 22...mixing chamber, 25...flame hole, 26
...Mixture jet passage, 27...Secondary air jet hole, 2
8...Secondary air blowout passage, 29...Secondary air blowout passage entrance. Agent Yoshihiro Morimotoz6 Flame hole diagram 2

Claims (1)

[Claims] 1. A mixing chamber provided above the liquid fuel vaporization means in communication with the primary air passage, and a plurality of rows of porous flame holes each discharging the air-fuel mixture above the mixing chamber. and a plurality of secondary air ejection holes at the upper end, which are disposed between each of the air mixture ejection passages, and a plurality of secondary air injection holes at the upper end;
A combustion device comprising a secondary air jetting passage having an inlet at an end communicating with the secondary air passage.