JP2957731B2 - 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 This type of liquid fuel combustion apparatus is, for example,
As disclosed in Japanese Utility Model Publication No. 1-297379,
Liquid fuel (kerosene) and primary air are supplied into a vaporizing cylinder heated by a heater or combustion heat, and a mixture of vaporized gas and primary air vaporized in the vaporizing cylinder is discharged from a burner head through a flame hole. It is designed to squirt and burn.
Then, the tip outlet of the air tube is located on the peripheral wall of the burner case provided on the outer periphery of the vaporizing cylinder, air is supplied from the blower through the air tube into the burner case, and the air is vaporized with the upper portion of the burner case. Through the annular gap between the top of the cylinder,
It was supplied around the flame as secondary air.

In the above-described combustion apparatus, cold air flowing out of the outlet of the air pipe flows toward the vaporizing cylinder and contacts the outer surface of the peripheral wall of the vaporizing cylinder, and the vaporizing cylinder is cooled by this air flow. Temperature. In particular, in the case of strong combustion in which the high-temperature portion of the flame is away from the burner head, it is difficult to recover the combustion heat in the vaporizing cylinder, and the supply amount of secondary air increases, so that the temperature of the vaporizing cylinder further decreases. Was. For this reason, it is difficult to maintain the temperature of the vaporizing section at a temperature suitable for vaporizing over a wide range from strong combustion to weak combustion, and in strong combustion, the heater must be frequently energized, resulting in increased power consumption. Was.

[0004]

Accordingly, in recent years, as shown in FIG. 6, the outlet 1A of the secondary air pipe 1 and the outlet 1A of the vaporizing cylinder 2 are opposed to each other so as to face the outlet 1A. The shielding plate 3 is provided upright between the peripheral wall and the shielding plate 3 to prevent the secondary air flowing into the burner case 4 from the outlet 1A from flowing directly toward the peripheral wall of the vaporizing cylinder 2. Was. In this configuration, since the upper part of the space between the shielding plate 3 and the outlet 1A is open, a part of the cold secondary air flowing out of the outlet 1A is directly vaporized as shown by an arrow a. Since the gas flows into the heat recovery portion at the upper portion of the cylinder 2 and cools the heat recovery portion, the effect of suppressing the temperature decrease of the vaporization cylinder was not obtained.

[0005] The present invention has been made in view of the above-mentioned circumstances, and has as its object to efficiently suppress a decrease in temperature due to secondary air in a vaporizing cylinder.

[0006]

According to the present invention, there is provided a vaporizing cylinder having a burner head on an upper portion, a burner case provided on an outer periphery of the vaporizing cylinder, a blower for supplying combustion air, and air from the blower. And a secondary air pipe having an outlet located on the peripheral wall of the burner case, and a blower guide provided in the burner case near the outlet of the secondary air pipe, wherein the blower guide is An opposing surface portion facing the outlet portion, and a closing portion for closing between the upper portion of the opposing surface portion and the peripheral wall of the burner case above the outlet portion, the secondary air flowing out of the outlet portion being directed to the opposing surface portion. It is configured to flow along the side.

[0007]

With this configuration, the secondary air flowing into the burner case from the outlet of the secondary air pipe flows sideways along the opposing surface of the blower guide, and cool secondary air is directly supplied to the vaporizing cylinder. It does not flow toward the lower part or upper part of the surrounding wall, but is heated by the radiant heat of the vaporizing cylinder and contacts the vaporizing cylinder after the temperature rises, so that the temperature drop of the vaporizing cylinder can be efficiently suppressed, and the ventilation guide is small. So good
Parts can be miniaturized, and the production cost does not increase significantly.

[0008]

FIG. 1 to FIG. 5 showing an embodiment of the present invention will be described below. 1 and 2, reference numeral 10 denotes a bottomed cylindrical vaporizing cylinder having an open top.
Heater 1 consisting of a sheathed heater is located above the peripheral wall
1 is buried. Reference numeral 12 denotes a primary air pipe that supplies combustion air into the vaporization cylinder 10, and the primary air pipe 12 communicates with a blower 13. Reference numeral 14 denotes a fuel supply pipe for supplying a liquid fuel (kerosene) into the vaporization cylinder 10. The fuel supply pipe 14 is connected to the fuel tank 1 via a pump 15 such as an electromagnetic pump.
The fuel tank 16 is provided with a cartridge tank 17.

Reference numeral 18 denotes an aperture plate disposed at the upper opening of the vaporizing cylinder 10. A burner head 19 is fitted and mounted on the upper opening of the vaporizing cylinder 10 above the aperture plate 18.
A wire mesh 20 is provided on the inner and outer surfaces of the peripheral wall of the burner head 19, and a large number of flame holes 21 are formed. Reference numeral 22 denotes a flame holding plate provided at the upper end of the vaporization cylinder 10;
The flame hole 2 is provided on the outer peripheral edge of the horizontal portion 22A of the flame holding plate 22.
An annular upstanding wall 22B opposing to 1 is formed.

Reference numeral 23 denotes a bottomed cylindrical burner case which is provided on the outer periphery of the vaporizing cylinder 10 and surrounds the vaporizing cylinder 10. Air is blown into the burner case 23 from the blower 13 via a secondary air pipe 24. It is. Also, the secondary air pipe 24
The tip outlet portion 24A is made to pass through the peripheral wall of the burner case 23 and face the inside of the burner case 23. The inside of the burner case 23 is made of a steel plate so as to face the outlet portion 24A. An air guide 25 is provided.

The blower guide 25 has an opposing surface portion 25A facing the outlet portion 24A of the secondary air pipe 24 at an interval S of about 5 to 10 mm, and is bent outward from the upper end of the opposing surface portion 25A. An upper surface closing portion 25B for closing between the facing surface portion 25A and the peripheral wall of the burner case 23 above the outlet portion 24A, a lower surface closing portion 25C formed by bending outward from a lower end of the facing surface portion 25A, and one side surface side; And a reverse L-shaped fixing portion 25E formed on the outer edge of the upper surface closing portion 25B and fixed to the peripheral wall of the burner case 23. , Only the right side is opened.

In FIG. 1, reference numeral 26 denotes an ignition electrode for igniting a mixed gas of vaporized gas and air ejected from the flame hole 21;
Reference numeral 27 denotes a flame rod that detects the ignited flame F and also detects the oxygen concentration, and 28 in FIG. 2 denotes a combustion cylinder.

In the above-described configuration, when the vaporizing cylinder 10 rises to a predetermined temperature by energizing the heater 11, the blower 13 and the pump 15 operate, and the liquid fuel is supplied from the fuel supply pipe 14 and the primary air pipe 12 is discharged. The primary combustion air is supplied to the inside of the vaporization cylinder 10 from. Here, the fuel supplied into the vaporizing cylinder 10 contacts the vaporizing surface and is vaporized. The mixed gas of the vaporized gas and the combustion primary air passes through the passage of the throttle plate 18 and enters the burner head 19. , From the flame hole 21. The jetted gas mixture is ignited by the spark discharge of the ignition electrode 26 to form a flame F and start combustion.

On the other hand, the secondary air supplied from the blower 13 into the burner case 23 through the secondary air pipe 24 flows out of the outlet 24A of the secondary air pipe 24, where it is opposed to the air guide 25. 25A and the upper surface closing portion 25B, flows laterally along the facing surface portion 25A, and flows from the open surface on the right side of the blower guide 25 to the vaporizing cylinder 10 and the burner case 23.
And rises while receiving the radiant heat of the vaporizing cylinder 10 and rises in temperature, passes through the annular gap between the upper part of the vaporizing cylinder 10 and the upper part of the burner case 23, and passes through the flame F And promotes the secondary combustion of the flame F.

When the temperature of the vaporizing cylinder 10 is maintained at a high temperature by the combustion heat, the power supply to the heater 11 is stopped, but the combustion is continued.

According to the present embodiment, the outlet 24A of the secondary air pipe 24 through which the secondary air from the blower 13 passes is located on the peripheral wall of the burner case 23 provided on the outer periphery of the vaporizing cylinder 10. An air guide 25 is provided in the burner case 23 so as to face the outlet 24A. Then, the blower guide 25 includes a facing surface portion 25A facing the outlet portion 24A.
Upper surface closing portion 25B for closing between the upper end portion of the facing surface portion 25A and the peripheral wall of the burner case 23 above the outlet portion 24A.
Since the secondary air flowing out of the outlet portion 24A of the secondary air pipe 24 is made to flow laterally along the facing surface portion 25A, the cold secondary air flowing out of the outlet portion 24A is directly vaporized. Without flowing toward the lower part of the peripheral wall of the vaporizing cylinder 10 or the upper part of the peripheral wall serving as the heat recovery part.
It will be in contact with the upper heat recovery part.

As a result, the temperature drop of the vaporizing cylinder 10 can be suppressed efficiently, and the heater 11 is frequently energized without excessively lowering the temperature of the vaporizing cylinder 10 even during strong combustion with little heat recovery. It is not necessary to do so, and there is no fear that tar is generated in the vaporization section due to a decrease in the temperature of the vaporization cylinder 10, and it is economical and can maintain good combustion over a wide range from strong combustion to weak combustion. In addition, the frame current can be stabilized.

Further, since the blower guide 25 can be made of a component having a relatively small shape, there is no concern that the production cost will increase significantly, and a combustion device excellent in heat insulation can be provided at low cost.

In the above embodiment, the air guide 25
Has a left side closed portion 25D formed on the left side,
The left and right side surfaces may be opened, and a lower surface closing portion 25C is formed at the lower portion.
If the entire lower edge of 5A is brought into contact with the bottom wall of burner case 23, lower surface closing portion 25C may not be provided.

[0020]

As described above, according to the present invention, the temperature reduction of the vaporizing cylinder due to the secondary air is efficiently suppressed, and the vaporizing cylinder is maintained at a suitable temperature over a wide range from strong combustion to weak combustion. Not only is it economical, of course, it is possible to always perform good combustion, and there is no concern that the production cost will increase significantly due to the use of a ventilation guide. It can be provided at low cost.

[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 longitudinal sectional view of a main part of the same.

FIG. 3 is a cross-sectional view of a main part in the same manner.

FIG. 4 is a perspective view of the burner case with the blower guide fixed.

FIG. 5 is a perspective view of the air guide alone.

FIG. 6 is a sectional view showing a conventional combustion device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Vaporization cylinder 13 Blower 19 Burner head 23 Burner case 24 Secondary air pipe 24A Exit part 25 Blast guide 25A Opposing surface part 25B Top surface blocking part (blocking part)

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A 63-49125 (JP, U) JP-A 62-118919 (JP, U) JP 29-29379 (JP, Y2) (58) Field (Int.Cl. ⁶ , DB name) F23D 11/10 F23D 11/40

Claims (1)

(57) [Claims] 1. A vaporizing cylinder having a burner head on an upper part,
A burner case provided on the outer periphery of the vaporizing cylinder, a blower for supplying combustion air, and air from the blower,
And, a secondary air pipe having an outlet located on the peripheral wall of the burner case, and a blower guide provided in the burner case near the outlet of the secondary air pipe, wherein the blower guide is provided at the outlet. An opposing opposing surface portion, a closing portion that closes a gap between an upper portion of the opposing surface portion and the burner case peripheral wall above the outlet portion, and the secondary air flowing out from the outlet portion is directed sideways along the opposing surface portion. A liquid fuel combustion device configured to flow.