JP3533410B2 - 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 device such as a petroleum fan heater that vaporizes and burns kerosene.

[0002]

2. Description of the Related Art A conventional petroleum fan heater is a vaporizer 1 for vaporizing petroleum (kerosene), as shown in FIGS.
Is provided with a heat recovery part 2 formed in a block shape or a round bar shape for recovering a part of combustion heat to the vaporizer 1, and an electric heater for maintaining the vaporizer 1 at a constant high temperature, and the main body 3 A Bunsen burner burner 5 for burning a mixed gas of fuel and air vaporized in the vaporizer 1 in the flame hole portion 4 therein
And the combustion chamber 7 that guides the hot air warmed by the combustion flame f of the flame hole 4 upward, and the hot air discharged from the combustion chamber 7 and the outside air taken in through the intake port 8 and mixed from the hot air outlet 9 It is provided with a convection blower 10 that blows out as warm air, and a duct 11 that divides the outside air taken in by the convection blower 10 into one that passes above the combustion chamber 7 and one that passes laterally. The duct 11 forms an air passage 12 that surrounds the front, rear, left, right, and upper portions of the combustion chamber 7. Note that FIG.
Inside, the black arrow shows the flow of hot air heated by the combustion flame f, and the white arrow shows the flow of air taken in by the convection blower 10.

Next, the operation of the oil fan heater will be described. First, when the cartridge tank 13 is set, the oil in the cartridge tank 13 is temporarily stored in the oil feed tank 14 and then sent to the vaporizer 1 by the pump 15.
The vaporized petroleum is injected into the burner 5 by the nozzle 16, and air is sucked into the burner 5 with this injection,
It mixes with the vaporized oil inside the burner 5 and burns in the flame hole portion 4 to form a combustion flame f. At this time, the heat recovery unit 2 comes into contact with the combustion flame f and transfers a part of the combustion heat to the carburetor 1, so that the carburetor 1 can be kept at a high temperature even if the amount of electricity supplied to the electric heater is suppressed.

The air in the combustion chamber 7 is heated by the combustion heat and discharged from the exhaust port 17 at the upper part of the combustion chamber 7 into the ventilation passage 12, and the convection blower 10 causes the ventilation passage 12 to flow.
After being mixed with the room temperature air inside, it becomes hot air and is discharged from the hot air outlet 9 to the outside of the main body 3.

[0005]

In order to realize energy saving, it has been a problem to reduce the power consumption of an electric heater for heating a vaporizer. Therefore, in the conventional oil fan heater, the heat recovery unit is provided in the vaporizer to suppress the power consumption, but it cannot be said to be sufficient. To further reduce power consumption, the heat recovery efficiency may be increased, but the heat recovery unit needs to be large. However,
The ventilation resistance in the combustion flame increases, causing incomplete combustion,
The combustion flame spreads while being blocked by the heat recovery unit and approaches the surrounding wall surface to directly heat the combustion chamber. Moreover, since the heat recovery part uses an expensive heat-resistant material, if the heat recovery part is made larger than this, the workability is deteriorated and the production cost is increased.

In view of the above, it is an object of the present invention to provide a liquid fuel combustion apparatus capable of reducing the power consumption of an electric heater for heating a vaporizer.

[0007]

Means for Solving the Problems In one aspect of the present invention
According to the liquid fuel combustion device, combustion that burns liquid fuel
And the combustion heat exhausted from this combustion chamber as hot air
Equipped with a convection blower that blows the liquid fuel into the combustion chamber.
A vaporizer that heats and vaporizes the material, and is vaporized by this vaporizer
Burner that burns mixed fuel with air and burns it
Arranged so as to come into contact with the combustion flame of Na and vaporize part of the combustion heat
To a liquid fuel combustion device equipped with a heat recovery unit
The air is taken in asymmetrically with respect to the combustion flame in the combustion chamber.
The combustion flame is pushed by this air and the combustion flame is recovered by the heat recovery unit.
The approach means for approaching the
The opposite side of the hood covering the upper part of the chamber from the heat recovery side
Bend it greatly and burn the air sent from the convection blower.
Ventilation openings are installed in the baking chamber so that they have different sizes.
It is characterized by that.

Liquid fuel according to another aspect of the present invention
The fuel combustion device includes a combustion chamber that burns liquid fuel, and this combustion chamber.
Sends out the combustion heat discharged from the baking chamber to the outside as warm air
Equipped with a convection blower to heat liquid fuel in this combustion chamber
The vaporizer and the fuel vaporized by this vaporizer
A burner that mixes with air and burns, and the combustion of this burner
Arranged in contact with the flame to transfer part of the combustion heat to the vaporizer
In a liquid fuel combustion device provided with a heat recovery unit,
Intake air asymmetrically with respect to the combustion flame of the combustion chamber,
The combustion flame is pushed by the air to bring the combustion flame closer to the heat recovery section.
Is provided above the combustion chamber.
Bend both ends of the hood to cover and blow out from the convection blower.
With a ventilation port to take in the generated air into the combustion chamber, and
Connect the air from the convection blower to the ventilation
Ventilation path formed by ducts that surround the sides of the combustion chamber
The width of the ventilation passage on the heat recovery side is
It is characterized in that it is narrower than the width of the ventilation passage of.

Liquid fuel combustion in accordance with another aspect of the invention
The device consists of a combustion chamber that burns liquid fuel, and
Convection that sends the heat of combustion exhausted from the outside as warm air
Equipped with a fan, the liquid fuel is heated and vaporized in the combustion chamber.
Vaporizer and the fuel vaporized by this vaporizer mixed with air
The burner to burn and burn
Heat recovery part that is arranged so as to convey part of the combustion heat to the vaporizer
In a liquid fuel combustion device equipped with and
Intake air asymmetrically with respect to the burning flame,
Press the combustion flame to bring the combustion flame closer to the heat recovery unit.
A step is provided, and this access means is provided for taking in air.
Install the ventilation port on the side of the combustion chamber and on the side opposite to the heat recovery unit side.
Install and use a convection blower or another blower to ventilate
Take in the air from the mouth and push the combustion flame to the heat recovery side.
It is characterized in that it is close to the heat recovery unit.

[0010]

[0011]

[0012]

DETAILED DESCRIPTION OF THE INVENTION

(First Embodiment) In the oil fan heater of the present embodiment, as shown in FIG. 1, the combustion flame f is brought close to the heat recovery section 2 without adding a new member to the conventional oil fan heater. Accessing means is provided. That is, the approaching means takes in air from the convection blower 10 into the combustion chamber 21 to generate circulating flows of different sizes on the left and right sides of the combustion flame f, and the combustion flame f is deformed and burned by these circulating flows. The flame f is brought closer to the heat recovery unit 2 on the left side.
It should be noted that the same components as those of the related art are denoted by the same reference numerals.

As shown in FIG. 2, the combustion chamber 21 is a square cylinder whose front surface 21a is tilted backward, and has a bottom surface and an upper surface which are entirely open, and the hot air heated by the combustion flame f is discharged from the exhaust port 22 on the upper surface. It is designed to be discharged. As shown in FIG. 1, the upper half of the burner 5 is immersed in the bottom opening,
On the left side of the burner 5 at the bottom of the room, a heat recovery unit 2 that projects from the carburetor 1 and reaches above the flame hole 4 of the burner 5 is housed. The back surface of the combustion chamber 21 extends upward,
Further, a hood 23 is formed which is curved forward and covers the rear and upper sides of the exhaust port 22.

Further, a convection blower 1 is provided on the back surface of the combustion chamber 21.
0 are arranged opposite to each other, and the outside air taken in from the intake port 8 is blown by the convection blower 10. This air is divided into one that passes above the combustion chamber 21 and one that passes laterally within the ventilation passage 12 formed by the ducts 11 that surround the upper and lateral sides of the combustion chamber 21. The hot air discharged from the exhaust port 22 is mixed to form warm air, and the warm air is discharged from the warm air outlet 9.

The hood 23 prevents the air from the convection blower 10 from flowing into the combustion chamber 21 from the exhaust port 22, and the air passing above the combustion chamber 21 enters the combustion chamber 21 from the exhaust port 22. It does not invade, and prevents the inflowing air from hindering the discharge of hot air and preventing the combustion flame f from being disturbed and generating an odor.

The approaching means bends the left and right ends of the hood 23 to form a ventilation port 24 for taking in the air from the convection blower 10 into the combustion chamber 21, and the convection blower 1
By utilizing the fact that the air flow formed by 0 is asymmetrical, more air is taken into the right side of the combustion flame f than from the left side.

Further, as shown in FIG. 3, when the upper end of the side surface of the combustion chamber 21 is extended upward to form the shielding plate 25, the combustion chamber 21
Air does not enter from the upper side of the combustion chamber 21, and the air that has flowed into the combustion chamber 21 from above the combustion chamber 21 descends along the side surface of the combustion chamber 21. Therefore, it is possible to prevent a problem in which the inflowing air disturbs the combustion flame f to generate an offensive odor.

As shown in FIG. 2, the hood 23 has a line connecting a point b inside each of the left and right ends with a fixed distance from each a point and a point c at a side end of the hood 23 with a constant distance behind each of the left and right ends. Combustion chamber 21
An inflow portion 26 that is bent at an acute angle toward the inside is formed. The ventilation port 24 is formed between the inflow portion 26 and the side surface of the combustion chamber 21. The air blown from the rear of the hood 23 by the pressure of the convection blower 10 is guided to the ventilation port 24 along the inflow portion 26, and is guided below the combustion chamber 21.

In the air vents 24 on both sides, the distance from the point a to the point b is as shown in FIG. 1 from the width W of the combustion chamber to the burner 5
Each of the left and right remaining dimensions excluding the outer diameter D of the flame hole portion 4 of
The width of 2 is less than or equal to α and β (α> β). As a result, the air taken in by the convection blower 10 is supplied to the combustion chamber 2
A part of the air is introduced into the combustion chamber 21 from the upper ventilation port 24, and the strength of the circulating flow due to the inflow air is changed on both the left and right sides of the flame hole portion 4 in the combustion chamber 21.

In the above construction, when the convection blower 10 is driven and the burner 5 burns oil, an ascending air current is generated in the combustion chamber 21 by the combustion heat. This hot air is discharged from the exhaust port 22 of the combustion chamber 21 to the ventilation passage 12, mixes with the outside air taken in by the convection blower 10 to become warm air, and is discharged from the warm air outlet 9 to the outside of the main body 3.

On the other hand, since the convection blower 10 takes in air into the ventilation passage 12 by rotating it clockwise, the airflow speeds on the left and right sides of the ventilation passage 12 are different,
Even if the combustion chamber 21 is opposed to the center and the ventilation holes 24 in the upper part of the combustion chamber 21 are formed symmetrically, the amount of air flowing into the combustion chamber 21 from each ventilation port 24 is not equal. Therefore, a large amount of air flows in from the right ventilation port 24.

The cold air flowing from the ventilation port 24 is
As shown in FIG. 1, it descends along the side surface of the combustion chamber 21, is heated by the combustion flame f, and rises. A part of it comes into contact with the cold air, becomes convection that descends again, and a circulating flow occurs. Further, if it reaches near the center of the exhaust port 22, the ventilation passage 12
Spills in. At this time, since the circulation flow on the right side is larger than that on the left side, the combustion flame f is pushed to the left side, and the contact area between the combustion flame f and the heat recovery unit 2 increases. Since air does not flow in from above the combustion flame f, the discharge of hot air is not hindered and the combustion flame f is not disturbed.

As described above, due to the deviation of the air flow caused by the rotation of the convection blower 10, a large amount of air flows into the right ventilating port 24 to form a circulation flow, and the heat recovery section 2 is affected by the difference in the strength of the left and right circulation flows. The combustion flame f can be brought closer, and the heat recovery efficiency is improved. Therefore, even if the electrical conductivity of the electric heater of the vaporizer 1 is suppressed, the temperature required for vaporizing oil can be maintained, and the power consumption of the electric heater can be reduced.

(Second Embodiment) In the present embodiment,
In order to bring the combustion flame f closer to the heat recovery unit 2 to reduce power consumption, in the oil fan heater of the first embodiment, the ventilation port 24 on the right side of the combustion chamber 21 is made larger than that on the left side as shown in FIG. ing. That is, the inflow portion 26 is bent so that the distance between the points a and b at the right end of the hood is larger than the distance between the points a and b at the left end of the hood.
As a result, the right ventilation port 24 becomes larger than the left ventilation port 24.

Therefore, a larger amount of air is taken into the combustion chamber 21 from the right ventilation port 24 than in the left side, thereby making the difference in the magnitude of the circulating flow between the left side and the right side of the combustion flame f remarkable. If the difference in the magnitude of the circulating flow becomes remarkable, the combustion flame f approaches the heat recovery unit 2 and gives a large amount of heat to the heat recovery unit 2, so that the power consumption of the electric heater can be reduced accordingly.

(Third Embodiment) In the present embodiment,
In the oil fan heater of the first embodiment, as shown in FIG. 5, the combustion chamber 21 is arranged so as to be shifted to the left side from the center of the convection blower 10, and the flow passage width between the right side surface of the combustion chamber 21 and the duct 11 is arranged. X is made larger than the flow path width Y between the left side surface and the duct 11. As a result, the amount of air taken in to the left and right of the combustion chamber 21 is made different, the difference in the circulating flow generated on the left side and the right side of the combustion flame f is made noticeable, and the combustion flame f is brought closer to the heat recovery section 2.

Since the air taken into the ventilation passage 12 by the convection blower 10 is biased toward the wider flow passage, a larger amount of air is supplied from the right ventilation port 24 near the wider flow passage. Flows into the combustion chamber 21, and does not flow much from the narrower passage width. Therefore, if the flow passage width on the opposite side of the heat recovery unit 2, that is, on the right side, is widened, the circulation flow generated on the right side of the combustion flame f becomes large and the combustion flame f shifts to the left side and approaches the heat recovery unit 2. , Combustion flame f and heat recovery unit 2
The contact area with and the heat recovery efficiency is increased, and the power consumption can be further reduced.

As described above, the air is forcibly taken into the combustion chamber 21 to form a convective circulation flow on both the left and right sides of the combustion flame f, and the strength of these is changed so that the combustion flame enters the heat recovery section 2. f can be brought closer. According to the experiment based on JIS, the power consumption per hour of the apparatus is 72 W in the oil fan heater of the conventional structure, but the power consumption is reduced to 48 W in the first embodiment of the present invention. However, the measurement result of 40 W in the second embodiment and 43 W in the third embodiment was obtained.

The present invention is not limited to the above embodiment, and it goes without saying that many modifications and changes can be made to the above embodiment within the scope of the present invention. For example, the ventilation port 24 may be provided only on the right side of the combustion chamber 21, and the combustion flame f may be pushed by the air flowing from the ventilation port 24 to bring the combustion flame f closer to the heat recovery unit 2. Further, a ventilation port 24 is provided on the side surface of the combustion chamber 21, and the ventilation port 2
The combustion flame f may be brought closer to the heat recovery unit 2 by the flow of air generated by providing 4. Alternatively, a blower may be provided separately from the convection blower 10, and the combustion flame f may be brought close to the heat recovery unit 2 by the wind pressure of the blower. When heat energy generated in the main body, kinetic energy of air, or the like is used as a drive energy source of the blower, increase in power consumption due to the addition of the blower can be suppressed.

[0030]

As is apparent from the above description, according to the present invention, since the approaching means for bringing air into the combustion chamber to bring the combustion flame closer to the heat recovery section is provided, the heat recovery section and the combustion flame come into contact with each other. The area can be increased, and the heat of combustion can be effectively used to improve the heat recovery efficiency. Therefore, the power consumption in the vaporizer can be reduced.

Further, since the combustion flame is brought close to the heat recovery section by using the air of the convection blower as the approaching means, it is not necessary to enlarge the expensive heat recovery section, and further, no new member is added. Also, by simply changing the shape and arrangement inside the apparatus, the heat recovery efficiency of the heat recovery section can be improved without increasing the cost, and the effect of reducing power consumption can be easily obtained.

[Brief description of drawings]

FIG. 1 is a schematic front sectional view of an oil fan heater according to a first embodiment.

FIG. 2 is a perspective view of a combustion chamber

FIG. 3 shows another combustion chamber, (a) is a plan view of the combustion chamber,
(B) is the same front view, (c) is the same side view

FIG. 4 is a schematic front sectional view of an oil fan heater according to a second embodiment.

FIG. 5 is a schematic front sectional view of an oil fan heater according to a third embodiment.

FIG. 6 is a schematic front sectional view of a conventional oil fan heater.

FIG. 7 is a schematic side view of the same.

[Explanation of symbols]

1 vaporizer 2 Heat recovery section 5 burners 10 convection blowers 21 Combustion chamber 23 Hood 24 Vent

   ─────────────────────────────────────────────────── ─── Continued front page       (56) Reference JP-A-4-340006 (JP, A)                 JP-A-5-340511 (JP, A)                 JP-A-5-272713 (JP, A)                 Actual Kaihei 5-71623 (JP, U)                 Actual Kaihei 3-56020 (JP, U)

Claims (3)

(57) [Claims] 1. A vaporization system comprising: a combustion chamber for burning liquid fuel; and a convection blower for sending the combustion heat discharged from the combustion chamber to the outside as warm air, wherein the combustion chamber heats and vaporizes the liquid fuel. A burner that burns the fuel vaporized in the vaporizer by mixing it with air, and a heat recovery unit that is arranged so as to contact the combustion flame of the burner and transfers a part of the combustion heat to the vaporizer. In the provided liquid fuel combustion device, air is introduced asymmetrically with respect to the combustion flame of the combustion chamber,
Proximity means for pushing the combustion flame by the air to bring the combustion flame closer to the heat recovery section is provided , and the proximity means is a combustion chamber.
Of the hood that covers the upper side of the
Bend it tightly and let the air sent from the convection blower
Ventilation ports that are taken into the combustion chamber are set so that they have different sizes.
Liquid fuel combustion device characterized by being struck . 2. A combustion chamber for burning liquid fuel and the combustion.
A pair that sends the combustion heat discharged from the chamber to the outside as warm air
A blower for heating liquid fuel into the combustion chamber.
Vaporizer that vaporizes the fuel and the fuel vaporized by the vaporizer to the air
Burner that is mixed with and burns with the combustion flame of the burner
Arranged to touch and transfer part of combustion heat to the vaporizer
In a liquid fuel combustion device provided with a heat recovery unit , air is introduced asymmetrically with respect to the combustion flame of the combustion chamber,
The combustion flame is pushed by the air and the combustion flame is transferred to the heat recovery section.
Proximity means for approaching is provided, and the proximity means is a combustion chamber.
Bend both ends of the hood that covers the top of the
The ventilation port that takes in the air sent out from the inside of the combustion chamber
And to guide the air from the convection blower to the ventilation port.
And the duct surrounding the side of the combustion chamber.
Of the ventilation passages formed on the heat recovery unit side
The width is narrower than the width of the ventilation passage on the side of the anti-heat recovery part.
A liquid fuel combustion device characterized by the above. 3. A combustion chamber for burning liquid fuel, and the combustion
A pair that sends the combustion heat discharged from the chamber to the outside as warm air
A blower for heating liquid fuel into the combustion chamber.
Vaporizer that vaporizes the fuel and the fuel vaporized by the vaporizer to the air
Burner that is mixed with and burns with the combustion flame of the burner
Arranged to touch and transfer part of combustion heat to the vaporizer
In a liquid fuel combustion device provided with a heat recovery unit , air is introduced asymmetrically with respect to the combustion flame of the combustion chamber,
The combustion flame is pushed by the air and the combustion flame is transferred to the heat recovery section.
Proximity means for approaching is provided, and the proximity means is configured to remove air.
A ventilation port for intake is provided on the side of the combustion chamber
Convection blower or another blower installed on the side opposite the collection side
By taking in the air from the ventilation port and burning the flame.
Is pushed toward the heat recovery section to bring it closer to the heat recovery section.
Liquid fuel combustion device.