JP3011473B2 - 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 an oil fan heater,
The present invention relates to a vaporization type liquid fuel combustion device used for an F type oil hot air heater or the like.

[0002]

2. Description of the Related Art As a liquid fuel combustion apparatus of this type, for example, as disclosed in Japanese Patent Publication No. 63-45003, a liquid fuel combustion apparatus is provided on the upper outer periphery of a vaporizing cylinder having a burner head having a flame hole in a peripheral wall. A ground plate having an annular upright wall facing the flame hole is provided, and the spread of the flame formed from the flame hole toward the side by the ground plate is suppressed as much as possible, and the metal cylinder constituting the combustion chamber is There is known one that is prevented from being heated to a high temperature higher than the heat-resistant temperature.

[0003]

By the way, in the above-mentioned vaporizing cylinder of the conventional apparatus, the heat generated by the combustion is recovered by the upper surface portion which is blown by the flame, and the vaporizing section is kept in kerosene even when the power supply to the vaporizing heater is stopped. And the like, the temperature can be maintained at a temperature at which the liquid fuel vaporizes, but the temperature varied by about 50 to 70 ° C. depending on the combustion state (strong combustion and weak combustion). That is, in the strong combustion, the heat recovery amount decreases because the high-temperature portion of the flame moves away from the burner head, and conversely, in the weak combustion, the flame approaches the burner head, so the heat recovery amount increases.

[0004] The preferred temperature of the vaporizing section is about 260-350.
It is said to be ° C. When the temperature is lower than 260 ° C., tar easily accumulates in the vaporizing section, and when the temperature is higher than 350 ° C., a phenomenon occurs in which the particulate unvaporized fuel flies in the vaporization chamber (splashing phenomenon). The fire was mixed with red fire.

[0005] Therefore, in the conventional apparatus, the amount of heat recovered to the vaporizing cylinder greatly changes depending on the combustion state, and the temperature of the vaporizing section changes due to the change in the amount of heat recovery. Therefore, it is not possible to maintain a suitable temperature over a wide range, and there is a problem that it is not possible to maintain a good combustion when an attempt is made to increase the combustion width.

[0006] The present invention has been made in view of the above-mentioned facts , and does not make the combustion of a liquid combustion apparatus unstable.
In addition, the liquid fuel is recovered to the vaporizing cylinder so that the temperature of the vaporizing section of the vaporizing cylinder that vaporizes the liquid fuel can be maintained at an optimal temperature over a wide range from strong combustion to weak combustion.
The purpose is to obtain a fuel combustion device .

[0007]

SUMMARY OF THE INVENTION The present invention comprises a bottomed cylindrical vaporization cylinder and combustion air liquid fuel therein is supplied, the upper end of the vaporizing tube with have a plurality of flame holes in a peripheral wall opening Mated with part
And the burner head facing the flame hole
And an annular upright wall surrounding the Naheddo, the vaporizing tube
The combustion air is mixed with the liquid fuel heated and vaporized in
Burn and collect heat from this combustion flame into vaporizer
A heat recovery section is provided between the flame hole and the ring-shaped upright wall.
Heat recovery section is integrated with the vaporizing cylinder at the upper end of the vaporizing cylinder.
And a column-shaped projection facing the flame hole of the burner head.

[0008]

With this configuration, the flame becomes small at the time of weak combustion, and the flame approaches the flame hole portion of the burner head. Therefore, the burner head and the upper end of the vaporizing cylinder are sufficiently heated by the flame in contact with the flame to vaporize. The part can be heated and maintained at a temperature suitable for vaporizing the fuel. On the other hand, at the time of strong combustion, the flame becomes large, and the high temperature portion of the flame separates from the flame hole portion, but a plurality of heat recovery projections provided at the upper end portion of the vaporizing cylinder are heated by being wrapped in the high temperature portion of the flame, and For heat recovery heated to high temperature
Since the heat of the protruding portion can be transmitted to the vaporizing portion, the amount of heat recovery during strong combustion can be dramatically increased.

The heat recovery section is located at the upper end of the vaporizing cylinder.
To be integrated with the vaporizer cylinder, facing the flame hole of the burner head.
Column-shaped projections.
Heat recovery because it is formed integrally with the vaporization cylinder by a strike
The heating of the projecting protrusion does not affect the vaporization cylinder, such as thermal deformation.
Almost no. Further, the heat recovery section of the present invention is provided at the upper end of the vaporizing cylinder.
Since it is a columnar projection provided on the
It is easy to shift the position and easily adjust the thickness and height of the pillars
Can be set, which allows the
Adjust the heating temperature appropriately to adjust the heat recovery to the optimal value
Heat recovery to the vaporization cylinder and
Extremely high degree of freedom in designing fuel heating temperature
It is. Furthermore, the burner head flame holes are irregularly arranged.
Even if it is done, it is easy to form a protrusion at the position corresponding to it
With a high degree of freedom in the structural design of the combustion device
It is.

[0010]

1 and 2 show an embodiment of the present invention.
This will be described with reference to the drawings. In FIG. 1, reference numeral 1 denotes a bottomed cylindrical burner case to which combustion secondary air from a blower 3 is supplied via a secondary air passage 2; 4 is built in the burner case 1; Heater 5
Is a buried cylindrical vaporizing cylinder having a bottom.
Is made of aluminum die cast having good thermal conductivity, and a vaporization chamber 6 is formed inside. An aperture plate 7 is provided in the upper portion of the vaporizing cylinder 4, and a burner head 8 including a head main body 8A and a canopy 8B is mounted on an upper end opening of the vaporizing cylinder 4 above the aperture plate 7. The peripheral wall 11 is provided with a plurality of flame holes 12, and a metal net 13 is attached to both the inner and outer surfaces (the inner surface side is omitted) of the peripheral wall 11. The flame hole 1
2 and 12 have a substantially triangular shape, and these flame holes 12 and 12 are provided alternately upside down in the circumferential direction of the peripheral wall 11 and close to each other.

A fuel nozzle 14 for supplying liquid fuel (kerosene) to the vaporizing chamber 6 and an air nozzle 15 for supplying primary combustion air are coaxially provided on the side of the peripheral wall of the vaporizing cylinder 4. Is connected to the blower 3 via a primary air passage 16, while the fuel nozzle 14 is connected to an oil tank 19 via a fuel supply passage 17 and a fuel pump 18. Reference numeral 20 denotes a cartridge tank for replenishing the oil tank 19 with liquid fuel.

Reference numeral 21 denotes an earth plate disposed on the outer periphery of the upper end portion of the vaporizing cylinder 4. This earth plate 21 has an annular upright wall 21A facing the flame holes 12 at its outer peripheral edge. The height of 21A is changed to the canopy 8B of the burner head 8.
It is assumed to be approximately equal to the height of And the upright wall 21A
The detection part of the frame rod 22 for detecting the flame F is positioned inside the frame.

Reference numerals 23, 23 denote flame holes 12 of the burner head.
A plurality (six in this embodiment) of heat recovery projections projecting from the upper end portion 4A of the vaporizing cylinder 4 so as to face the heat recovery projections 23. These heat recovery projections 23, 23 are shown in FIG. Thus, each has a columnar shape, the diameter T is set to about 6 to 8 mm, the height H is set to about 8 to 10 mm, and the upper end 4A of the annular vaporizing cylinder 4 is substantially mutually circumferentially arranged. About 25-35m
m is provided at a large interval S.
Is formed by integral molding. Where all the heat
The collection protrusion 23 has a substantially triangular shape with the top portion facing upward.
The heat is efficiently collected by being opposed to the flame hole 12 in the direction .

Reference numeral 24 denotes an igniter for igniting a mixture of vaporized fuel and air ejected from the flame hole 12, and reference numeral 25 denotes a temperature detector for detecting the temperature of the peripheral wall of the vaporizing cylinder 4 as a vaporizing section.

In the above-described configuration, when the temperature of the vaporizing cylinder 4 rises to a predetermined temperature by energizing the heater 5, the blower 3 and the fuel pump 18 operate, and liquid fuel from the fuel nozzle 14 and liquid fuel from the air nozzle 15 Combustion air is in vaporization chamber 6
Supplied to Here, the fuel ejected from the fuel nozzle 15 contacts the vaporizing surface and is vaporized, and a mixture of the vaporized gas and the combustion air passes through the passage of the throttle plate 7 and enters the burner head 8, and the flame hole It gushes from 12. This air-fuel mixture is ignited by spark discharge from the igniter 24 to form a flame F and start burning. Then, when the temperature of the vaporizing cylinder 4 is maintained at a high temperature by the combustion heat, the power supply to the heater 5 is stopped.

Here, when the combustion is strong combustion, the flame F formed on the side of the flame hole 12 is large, and the high temperature portion of the flame F is separated from the flame hole 12, but the high temperature portion of the flame F is vaporized. Cylinder 4
Since the heat recovery projections 23, 23 projecting from the upper end of the heat recovery enclosure 23 are respectively wrapped and heated, not only the contact area with the flame F increases, but also the heat of the heat recovery projections 23, 23 evaporates. It can be transmitted to the cylinder 4 well, and even in the case of strong combustion where it is difficult to recover heat, the amount of heat recovery can be dramatically increased as compared with the conventional case. Can be heated and maintained at a temperature suitable for vaporization.

On the other hand, when the combustion is weak, the flame F becomes small and approaches the respective flame holes 12, 12, so that the head main body 8A and the upper end of the vaporizing cylinder 4 are sufficiently exposed to the flame F that has come into contact. As a result, the vaporizing cylinder 4 can be heated and maintained at a temperature suitable for vaporizing the fuel.

Therefore, as described above, the temperature change width of the carburetor 4 can be reduced in a wide range from strong combustion to weak combustion,
Combustion is stable over a wide range from strong combustion to weak combustion, flame current can be stabilized, and the amount of generated CO is reduced. In addition, the flame temperature is reduced due to the heat recovery action of the heat recovery projections 23, 23. , Nitrogen oxides can be reduced, and the combustion range can be greatly expanded.

Further, since the heat recovery projections 23, 23 are integrally formed with the vaporization cylinder 4 by aluminum die casting , heat recovery can be performed without any troublesome work such as cutting.
The projections 23, 23 can be provided on the vaporizing cylinder 4 and can be manufactured very easily.

Further, since the heat recovery projections 23 are provided with an interval S therebetween, the height H of the heat recovery projection 23 is slightly lower than the upper edge of the flame hole 12. The conditions for heat recovery are appropriately set, such as setting a low value, changing the size of the diameter T, or widening the interval S between the adjacent heat recovery protrusions 23, and shrinking the size. By doing so, the amount of heat recovery during strong combustion can be easily adjusted during design.

Further, all the heat recovery projections 23,
23, the heat recovery projections 23, 2
Since 3 is wrapped in the wide portion of the flame F formed in the flame hole 12, the flame 3 is efficiently heated by the flame F, and the heat recovery can be performed more favorably.

[0022]

The present invention provides a heat recovery projection having the above- described structure.
Heating of the heat recovery projection by the combustion flame
There is almost no effect such as thermal deformation,
Of Combustion due to Deformation of Vaporization Cylinder due to Provision of Portion
To provide a liquid fuel combustion device without a fixed
Can be. Furthermore, in the liquid fuel combustion device of the present invention,
Require complicated cutting work to match the flame holes in the
Can be provided without heat recovery, making production very easy
The temperature of heat recovery to the vaporization cylinder is changed as appropriate.
To control the heat recovery of the liquid fuel combustion device
One that can increase the degree of freedom of heating design
And over a wide combustion range from strong combustion to weak combustion
The temperature difference between the vaporizing cylinders is reduced, and the temperature of the vaporizing section
Can be maintained in an optimal state. This allows a wide range of
And stable combustion, the combustion range is wide,
Second, a liquid fuel combustion device having excellent combustion characteristics can be obtained .

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a liquid fuel combustion apparatus according to an embodiment of the present invention.

FIG. 2 is a perspective view of the vaporizing cylinder.

[Explanation of symbols]

 Reference Signs List 4 vaporizing cylinder 8 burner head 11 peripheral wall (peripheral wall) 12 flame hole 23 heat recovery protrusion

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-62-225812 (JP, A) JP-A-2-187509 (JP, A) JP-A-2-62214 (JP, U) JP-A 57-225 66313 (JP, U) Japanese Utility Model Showa 62-160119 (JP, U) JP-B 63-45003 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) F23D 11/10 F23D 11 / 40

Claims (1)

(57) [Claims] 1. A bottomed cylindrical vaporization cylinder and combustion air liquid fuel therein is supplied, it said have a plurality of flame holes in a peripheral wall portion
A burner head fitted to the upper end opening of the vaporizing cylinder ;
An annular flange surrounding the burner head facing the flame holes
Upright wall, and the liquid fuel heated and vaporized in the vaporization cylinder
Combustion air is mixed and burned in a flame hole.
The heat recovery unit that recovers heat from
The heat recovery part is formed integrally with the vaporizing cylinder at the upper end of the vaporizing cylinder, and is formed as a column-shaped projection facing the flame hole of the burner head. Liquid fuel combustion device.