JPH04320708A - Liquid fuel burner - Google Patents

Abstract

PURPOSE:To raise the heat recovery efficiency without giving a complicated machining to the burner head made of ceramics. CONSTITUTION:An internal projection section 3 is formed so as to position part of the heat recovery wall 2 of a carburetor 1 above the flame port 5 in the circumferential section of the burner head 4 and/or between the flame ports 5, 5. With this arrangement the area that is directly scorched by the flame can be increased and the rate of heat recovery is thereby improved, and it is possible to continue a stable combustion by the heat of the self-combustion heat.

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 burner head made of ceramics.

0002

2. Description of the Related Art Some liquid fuel combustion devices of this type have burner heads made of ceramic having excellent heat resistance. However, ceramics have poor thermal conductivity, so even if we tried to recover the heat from the ceramic burner head heated by combustion heat and use it to vaporize liquid fuel, the efficiency was low, so it was necessary to turn on the heater even during normal combustion. It was. In order to improve this point, Japanese Utility Model Publication No. 60-2425 discloses that an annular heat recovery wall is provided in the vaporizer, a ceramic burner head is provided inside the heat recovery wall, and a large number of holes are provided in the burner head. Among the flame openings in the burner head, the diameter of the flame opening on the periphery of the burner head is made larger than the other flame openings, and by heating the heat recovery wall with the strong and high combustion flame on the periphery of the burner head, the heat recovery efficiency is improved. Disclosure has been made regarding a device that is effective in improving the condition.

0003

[Problems to be Solved by the Invention] With the structure of the heat recovery wall described above, the heat recovery wall is not directly scorched by flame. Furthermore, making the flame opening diameter of the peripheral portion of the ceramic burner head larger than others requires complex processing of the ceramic, and there is a problem in that it is more likely to crack due to heat shock.

An object of the present invention is to improve heat recovery efficiency without performing complicated processing on a ceramic burner head.

[0005]

[Means for Solving the Problems] In order to achieve the above object, the liquid fuel combustion device of the present invention has an opening at one end, and an annular heat recovery wall is provided in this opening. It is equipped with a vaporizer and a ceramic burner head that is installed inside the heat recovery wall of the vaporizer and has a large number of flame ports that ejects a mixture of vaporized fuel and combustion air. A part of the recovery wall is made to protrude inward so as to be located above and/or between the burner ports at the peripheral edge of the burner head.

Protruding a portion of the heat recovery wall of the vaporizer inward so as to be located above and/or between the burner ports at the peripheral edge of the burner head, it is possible to It can be configured by an annular member made of a material with excellent heat resistance and thermal conductivity.

[0007] Further, the above object has an opening at one end,
and a vaporizer in which an annular heat recovery wall is provided in the opening, and a rectifying plate provided inside the vaporizer and having a number of vents for rectifying a gas mixture of vaporized fuel and combustion air. and a ceramic burner head provided inside the heat recovery wall of the vaporization cylinder and having a large number of flame ports for spouting out the mixed gas that has passed through the current plate, and a vent hole on the peripheral edge of the current plate. This can also be achieved by making the vents larger than the other vents.

[0008]

[Function] If a part of the heat recovery wall of the vaporizer protrudes inward so as to be located above and/or between the flame ports on the periphery of the burner head, the area directly exposed to flames can be increased. This improves heat recovery efficiency and allows stable combustion to continue due to self-combustion heat.

[0009] By forming grooves located above and/or between the flame ports on the periphery of the burner head in the annular member screwed into the inside of the heat recovery wall of the vaporizer, the area burned by the flame can be further increased. Since the heat recovery efficiency can be increased, further improvement in heat recovery efficiency can be expected.

[0010] Furthermore, if the airflow of the mixed fuel is increased by enlarging the ventilation holes on the outer periphery of the rectifying plate, the flame of the burner head directly above it will become stronger and larger than the other flames, which will inevitably cause heating of the heat recovery wall. This further increases the heat recovery efficiency, which leads to an improvement in heat recovery efficiency.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a sectional view of a liquid fuel combustion apparatus showing an embodiment of the present invention.

1 is a vaporizer having an opening at one end and an annular heat recovery wall 2 provided in the opening;
A part of the heat recovery wall 2 of the vaporizer 1, that is, the upper end thereof is an inwardly protruding part 3.
It becomes. This inward protrusion 3 is provided on the inside of the heat recovery wall 2 of the vaporizer 1, and is located at the periphery of a ceramic burner head 4 that has a large number of flame ports 5 for spouting out a gas mixture of vaporized fuel and combustion air. and/or between the flame ports 5 and 5. 6 is a rectifying plate provided inside the carburetor 1 and has a large number of vents 7 for rectifying the mixed gas of vaporized fuel and combustion air; 9 is a rectifying plate between the rectifying plate 6 and the bottom of the carburetor 1; In the vaporization mixing chamber formed,
A heater 10 is installed on the side to heat the vaporization mixing chamber 9 at the beginning of use of this combustion device, and a fuel supply pipe 11 is installed inside.
The outlet of the fan 15 is open, and a stirring blade 12 attached to the shaft end of a fan 15, which will be described later, is disposed. Reference numeral 13 denotes a pressure boosting chamber that communicates with the vaporization mixing chamber 9 through an air inlet 14 located below, and a fan 1 for boosting the pressure of the primary air is provided inside.
5 are arranged.

Now, when the primary air whose static pressure has been increased by the fan 15 is sent from the boosting chamber 13 to the vaporization mixing chamber 9 through the air inlet 14, the fuel supply pipe 1 is inserted into the vaporization mixing chamber 9.
The liquid fuel sent from 1 is atomized by the rotating stirring blade 12, and the atomized fuel hits the inner wall of the vaporization mixing chamber 9, which has been heated in advance by the heater 10, and is mixed with the vaporized fuel to form a mixed vaporized fuel. Since the vaporized fuel passes through the vent 7 of the baffle plate 6 and is ejected from the flame port 5 of the burner head 4, combustion can be started by igniting it with a spark plug (not shown). During combustion, the inward protrusion 3 of the heat recovery section 2 is directly heated by the flame from the flame port 10, and the heat of the inward protrusion 3 thus heated is transferred to the mixture vaporization chamber 9 side via the heat recovery section 2. Since it is transmitted, the heater 10
Even if the electricity is turned off, stable combustion continues due to self-combustion heat.

The above-described inward protrusion 3 is formed by forming a groove 17 in an annular member 16 made of die-cast aluminum, for example, which is screwed onto the inside of the annular heat recovery wall 2 and has excellent heat resistance and heat conductivity.
It is recommended to configure it by including This annular member 16 also serves as a fixing means for holding the ceramic burner head 4 in a planar shape. As an example of the groove 17, the one shown in FIGS. 2 and 3 has a circumferential lateral groove 17a forming a surface facing the flame port 5 on the peripheral edge of the burner head 4, and the one shown in FIGS. 4 and 5. In addition to the horizontal grooves 17a in the circumferential direction, a plurality of vertical grooves 17b in the circumferential direction form a U-shaped surface located between the flame ports 5, 5 on the peripheral edge of the burner head 4. . Both of these methods further increase the heating area that is directly heated by the flame, and are effective in improving heat recovery efficiency.

The other embodiment shown in FIG. 6 does not have the inward protrusion 3 like the annular member 16 described above. Instead, as shown in FIGS. 7 and 8, the vent hole 7a at the peripheral edge of the current plate 6 is made larger than the other vent holes 7. Since the amount of the mixed vaporized fuel passing through the large ventilation opening 7a is much larger than the others, the flame near the annular member 16 is strong and large even when it comes to the flame of the burner head 4, and therefore the annular member 16 is sufficiently heated. Therefore, heat recovery can be performed effectively.

[0016]

Effects of the Invention As explained above, the present invention provides that a part of the heat recovery wall of the vaporizer is located above the burner opening at the peripheral edge of the burner head and/or
Alternatively, by protruding inward so as to be located between the flame ports, the heating area that is directly heated by the flame can be reduced without compromising durability, as is the case when the flame ports of ceramic burner heads are provided with different sizes. This increases the heat recovery efficiency and allows stable combustion to continue due to self-combustion heat.

[0017] By forming grooves located above and/or between the burner ports on the peripheral edge of the burner head in the annular member that is screwed into the inside of the heat recovery wall of the vaporizer, the area heated directly by the flame is increased. A further increase in heat recovery efficiency can be expected, and in combination with the excellent thermal conductivity of the annular member, further improvement in heat recovery efficiency can be expected.

[0018] Also, the ventilation holes on the outer periphery of the rectifying plate are enlarged,
By increasing the amount of mixed gas that passes through this part and making the flame of the burner head that hits directly above it stronger and larger than others, the ceramic burner head has a long lifespan even if the degree of heating of the heat recovery wall is further increased. This will lead to improved heat recovery efficiency without sacrificing performance.

[Brief explanation of drawings]

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

FIG. 2 is a plan view of the annular member in FIG. 1;

FIG. 3 is a cross-sectional view of FIG. 2;

FIG. 4 is a plan view of another annular member location different from FIGS. 2 and 3;

FIG. 5 is a cross-sectional view of FIG. 4.

FIG. 6 is a sectional view of a liquid fuel combustion device showing another embodiment of the present invention.

FIG. 7 is a plan view of the current plate in FIG. 6.

FIG. 8 is a cross-sectional view of FIG. 7;

[Explanation of symbols]

1...vaporizer 2...Annular heat recovery wall 3...Inward protrusion 4... Ceramic burner head 5...flame mouth 6... Rectifier plate 7...Vent 7a...Large ventilation hole 16...Annular member 17...Groove 17a...Horizontal groove 17b...Vertical groove

Claims (3)

[Claims] Claim 1: A vaporizer having an opening at one end and an annular heat recovery wall provided in the opening, and a vaporizer provided inside the heat recovery wall of the vaporizer for combustion of vaporized fuel. A burner head made of ceramics has a large number of flame holes that eject a mixed gas of air for use, and a part of the heat recovery wall of the vaporizer is located above and/or between the flame holes on the periphery of the burner head. A liquid fuel combustion device characterized by projecting inward as shown in FIG. Claim 2: A vaporizer having an opening at one end and an annular heat recovery wall provided in the opening, and a vaporizer provided inside the heat recovery wall of the vaporizer for combusting vaporized fuel A burner head made of ceramics has a large number of flame ports that ejects a mixed gas of air for use, and a ring-shaped burner head made of a material with excellent heat resistance and thermal conductivity that is screwed onto the inside of the heat recovery wall of the vaporizer. A liquid fuel combustion device comprising: a member, wherein the annular member has a groove located above and/or between the burner ports on the peripheral edge of the burner head. 3. A vaporizer having an opening at one end and an annular heat recovery wall provided in the opening, and a vaporizer provided inside the vaporizer for mixing vaporized fuel and combustion air. a rectifying plate having a large number of vents for rectifying the gas; and a burner head made of ceramics having a large number of flame ports provided inside the heat recovery wall of the vaporization cylinder and spouting the mixed gas that has passed through the rectifying plate; 1. A liquid fuel combustion device, characterized in that a vent at a peripheral edge of the rectifying plate is larger than other vents.