JP2957735B2 - Liquid fuel combustion device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid fuel combustion apparatus having a ceramic burner head.

[0002]

2. Description of the Related Art In this type of liquid fuel combustion apparatus, as disclosed in Japanese Utility Model Publication No. 60-2425, for example,
An annular heat recovery wall is provided in the vaporizer, and a ceramic burner head is engaged with a step formed inside the heat recovery wall, so that combustion heat is transmitted to the vaporizer through the heat recovery wall, and the liquid fuel is removed. It can be used for vaporization. In the above-mentioned publication, no particular description is given of the means for fixing the ceramic burner head.

[0003]

If the ceramic burner head is fixed by screws at several places, stress will be concentrated on a part of the burner head. There is a risk. Also, since the thermal conductivity of ceramics is not good, the efficiency of heat transfer from the heated ceramic burner head to the heat recovery wall cannot be said to be good, so it would be very convenient if this disadvantage could be compensated for by the burner head fixing means. is there.

[0004] In view of the above-mentioned facts, it is an object of the present invention to reduce the stress concentration as much as possible, particularly for the fixing means of the burner head, and to contribute to effective heat recovery for vaporizing the liquid fuel.

[0005]

In order to achieve the above object, a liquid fuel combustion device according to the present invention has an opening at one end and an annular heat recovery wall provided at the opening. A rectifying plate provided inside the carburetor and having a number of vents for rectifying a gas mixture of vaporized fuel and combustion air; and a rectifying plate provided inside a heat recovery wall of the vaporizer. A ceramic burner head having a number of flame openings for ejecting the mixed gas that has passed through the plate, and an annular shape screwed into the heat recovery wall of the vaporizer and having a lower end surface in contact with a peripheral portion of the burner head. The annular member is made of a material having excellent heat resistance and heat conductivity.

[0006]

[Work] The fixing of the ceramic burner head is performed by the lower end surface of the annular member being brought into contact with the peripheral portion of the burner head. In addition, due to the excellent heat resistance and thermal conductivity of the annular member that is directly exposed to the flame, and the screw attachment structure to the heat recovery wall of the vaporizer, the heat transfer from the annular member to the vaporizer heat recovery wall is extremely effective. It is done on a regular basis.

[0007]

FIG. 1 is a sectional view of a liquid fuel combustion apparatus showing one embodiment of the present invention.

The vaporizer 1 has an opening at the upper end thereof as an annular heat recovery wall 2, and a screw 3 is cut at the upper end of the inner surface of the heat recovery wall 2. A receiving portion 5 that protrudes inward downward is formed.

A rectifying plate 6 having a large number of ventilation holes 7 for rectifying a gas mixture of vaporized fuel and combustion air is provided on the receiving portion 5.

[0010] A packing material 8 made of ceramic paper having excellent heat resistance, flexibility and sealing properties, such as alumina ceramic fiber, is laid on the step portion 4. A burner head 9 made of ceramics such as silica-based petalite is provided. Reference numeral 10 denotes a large number of flame openings formed in the burner head 9. The burner head 9 can be screwed with the screw 3,
The lower end surface is fixed by being pressed in a planar manner by the annular member 11 abutting on the peripheral portion of the burner head 9, so that the stress is uniformly applied to a wide area. The annular member 11 is made of a material having the same heat resistance and heat conductivity as the vaporizer 1, for example, an aluminum die-cast.

At the side of the vaporizing / mixing chamber 12 formed between the current plate 6 and the bottom of the vaporizer 1, a heater 13 for heating the vaporizing / mixing chamber 12 at the beginning of use of the combustion device is mounted. An outlet of the fuel supply pipe 14 is opened therein, and a stirring blade 15 attached to a shaft end of a fan 18 described later is provided therein. A fan 18 for pressurizing the primary air is disposed inside the pressurizing chamber 16 which communicates with the lower part of the vaporizing and mixing chamber 12 by the air inlet 17. Incidentally, 19
Denotes a flame detection unit of a known flame detection device.

When the primary air whose static pressure has been increased by the fan 18 is sent from the pressurizing chamber 16 to the vaporizing / mixing chamber 12 through the air inlet 17, the liquid fuel jetted from the fuel supply pipe 14 in the vaporizing / mixing chamber 12. Rotating stirring blade 15
Is atomized, and it is vaporized by hitting the inner wall of the vaporization mixing chamber 12 heated by the heater 13.
The primary air mixes with this to become a fuel mixture, which passes through the vent 7 of the flow straightening plate 6 and blows out from the flame port 10 of the burner head 9, and is ignited by a spark plug (not shown). Combustion can be started. Since the annular member 11 is made of a material having excellent heat conductivity,
When the annular member 11 is heated by combustion heat during combustion, the heat is effectively transmitted to the vaporization mixing chamber 12 side.

[0013]

As described above, the present invention is a ceramic burner head which is fragile due to stress concentration. However, since the lower end surface of the annular member abuts on the peripheral portion of the burner head and is fixed, the stress is reduced. Is uniformly applied to a large area, and therefore, cracks can be eliminated when the ceramic burner head is attached or when the ceramic burner is burned. In addition, since this annular member is made of a material having excellent heat resistance and heat conductivity and is screwed to the heat recovery wall of the vaporizer, when the annular member is heated by combustion heat, the heat is effective. Since it can be transmitted to the heat recovery wall of the vaporizer, it is effective for heat recovery. Further, when a packing material is used at the contact portion, the gas-vaporized fuel leakage from the peripheral portion of the burner head can be prevented by the sealing effect of the packing material, which can contribute to an improvement in combustion performance.

[Brief description of the drawings]

FIG. 1 is a sectional view of a liquid fuel combustion apparatus showing one embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Vaporizer 2 ... Annular heat recovery wall 3 ... Screw 6 ... Rectifier plate 7 ... Ventilation opening 9 ... Ceramic burner head 10 ... Flame opening 11 ... Annular member

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F23D 11/40 F23D 11/04-11/08

Claims (1)

(57) [Claims] 1. A vaporizer having an opening at one end and an annular heat recovery wall at the opening, and a mixed gas of vaporized fuel and combustion air provided inside the vaporizer. A flow straightening plate having a large number of ventilation holes for straightening, a ceramic burner head provided inside a heat recovery wall of the vaporizer and having a large number of flame openings for jetting a mixed gas passing through the flow straightening plate, Screwed inside the heat recovery wall of the vaporizer,
An annular member having a lower end in contact with a peripheral portion of the burner head, wherein the annular member is made of a material having excellent heat resistance and thermal conductivity.