JPH0748003B2 - Liquid fuel combustion device - Google Patents

Description

TECHNICAL FIELD The present invention relates to an improvement in a liquid fuel combustion device.

[Prior Art] FIG. 3 is a cross-sectional view of a main part of a conventional liquid fuel combustion apparatus, in which 1 is a carburetor, 2 is a vaporization chamber, 3 is a throat, 4 is a heater, 5 is an oil supply pipe, and 6 is Nozzle, 6a is a nozzle hole, 7 is a communication pipe, 8 is a needle pipe, 9 is a needle, 10 is a solenoid valve, 11 is a valve, 12 is a thermistor, 13 is an air intake hole, 14 is an oil feed pipe, 15 is an oil supply pump, 16 is an oil tank, 17 is a flame hole plate,
18 is a blower, 19 is a combustion cylinder, 20 is a secondary air hole, 21 is a combustion chamber, 22 is a body casing, 23 is a bottom plate, 24 is flame, 25 is air, 26 is combustion gas, 27 is a hot air mixing chamber. is there.

As shown in the figure, the vaporizer 1 is provided with an annular vaporization chamber 2 and a heater 4 for heating the vaporization chamber 2, and a tubular throat 3 inside the vaporization chamber. A nozzle 6 having a nozzle hole 6a is fixed to the lower part of the throat 3, and a needle 9 that moves up and down by a solenoid valve 10 and a valve 11 is arranged in the nozzle 6, and a communication pipe 7 that leads to the vaporization chamber 2 and vaporization are provided. A combustion control device is configured with the thermistor 12 attached to the lower part of the vessel 1. Further, the oil feed pump 15 arranged above the oil tank 16 includes an oil feed pipe 14 and an oil feed pipe 5.
Together with this, a fuel supply device is formed to supply the fuel in the oil tank 16 to the vaporization chamber 2. A combustor is constituted by the fuel supply device, the vaporizer 1 and the combustion control device.

A flame hole plate 17 is provided surrounding the throat 3, a combustion cylinder 19 is arranged outside the rough flame hole plate 17, and a blower 18 is arranged outside thereof. The conventional liquid fuel combustion device is configured as described above.

Next, the operation will be described. Oil pump 15 from oil tank 16
The liquid fuel sent to the vaporization chamber 2 through the oil feed pipe 14 and the oil feed pipe 5 is vaporized by the wall of the vaporization chamber heated to 200 to 300 ° C. by the heater 4 and becomes fuel gas. At the same time, the solenoid valve 10 stops, the valve 11 closes, and the needle 9 moves downward,
The nozzle hole 6a opens, and the fuel gas in the vaporization chamber 2 is ejected from the nozzle hole 6a into the throat 3 through the communication pipe 7. At this time, ambient air due to the momentum of the fuel gas ejected from the nozzle hole 6a flows in from the air intake hole 13, mixes with the fuel gas and burns, and a flame 24 is formed on the flame hole plate 17. On the other hand, the air 25 supplied by the blower 18 flows into the combustion chamber 21 through the secondary air holes 20, burns with the unburned components in the flame 24, and the combustion gas 26.
Then, it is discharged to the outside of the machine body through the warm air mixing chamber 27.

[Problems to be Solved by the Invention] In the above liquid fuel combustion apparatus, in order to completely burn the fuel and obtain the exhaust gas characteristics in which the content of carbon monoxide is minimized, the mixing ratio of the fuel and the air, especially the flame is used. It is necessary to set the mixing ratio of the air and the secondary air to an appropriate value. However, in the conventional apparatus, there is no air intake port for inflowing the air supplied from the blower 18 at the upper part of the combustion cylinder 19, and the secondary air flows into the combustion chamber 21 at the secondary part of the lower part of the combustion cylinder. Air holes 20
Since the secondary air hole 20 is blocked by dust, etc., the secondary air 25 becomes insufficient and incomplete combustion occurs, resulting in the emission of carbon monoxide gas that is harmful to the human body. Had a point.

The present invention has been made in order to solve the above problems of the conventional apparatus, and provides a liquid fuel combustion apparatus having an excellent exhaust gas characteristic capable of supplying sufficient secondary air to the flame without disturbing the flame. It is the one we are trying to provide.

[Means for Solving the Problems] In order to achieve the above object, a liquid fuel combustion apparatus according to the present invention includes a combustor for vaporizing and burning liquid fuel, and a combustor surrounding the combustor to be discharged from the combustor. A liquid fuel combustor comprising: a combustion cylinder for guiding the combustion gas to an upper opening thereof; and a blower provided on the rear side of the combustion cylinder for delivering the combustion gas to the outside. An air inlet for allowing a part of the air blown from the blower to flow into the combustion cylinder is provided at an upper portion of the side wall surface of the blower and below a top end of the wall surface facing the side wall surface of the blower. It is a thing.

[Operation] In the liquid fuel combustion apparatus configured as described above,
An air inlet provided in the upper part of the side wall surface of the blower in the combustion cylinder allows the air blown by the blower to flow into the combustion cylinder. Then, since this air inlet is provided at a position lower than the upper end of the wall surface facing the blower side wall surface, the air flowing into the combustion cylinder descends along the inner wall surface facing the blower side wall surface, It is used for burning fuel without disturbing the flame.

[Embodiment of the Invention] FIG. 1 is a sectional view of a liquid fuel combustion apparatus showing an embodiment of the present invention, FIG. 2 is a plan view of a combustion cylinder, a is a rear view, and c is a side view. 1 to 27 are the same parts as the conventional device, and 28 is an air inlet.

As shown in FIG. 2, air inlets 28 are formed in the upper portions of both side plates of the combustion cylinder 19. As a result, the air 25 supplied by the blower 18 is, as shown in FIG.
It flows into the inside 19 and descends along the wall 19a in front of the combustion cylinder and comes into contact with the flame 24 and mixes. Since the secondary air 25 flows in from the upper part of the side portion of the combustion cylinder and descends along the front wall 19a, it does not disturb the flame 24 in the combustion chamber. In addition to the secondary air flowing from the secondary air hole 20, the secondary air of the blower also flows into the combustion cylinder 19 from the upper part of the combustion cylinder, so that the mixing ratio of the flame and the secondary air should be an appropriate value. And complete combustion takes place. As a result, the exhaust gas characteristics are excellent with the minimum content of carbon monoxide.

The shape of the air inlet 28 formed in the combustion cylinder is not limited to the notch of this embodiment, and its position may be slightly changed.

[Advantages of the Invention] In the liquid fuel combustion apparatus according to the present invention, an air inlet is provided in an upper part of the side wall surface of the blower of the combustion cylinder, so that the air flowing from the air inlet into the combustion cylinder is blown against the side wall surface of the blower of the combustion cylinder. Since it descends along the inner wall surface facing the fuel cell and is used for fuel combustion without disturbing the flame, the amount of secondary air supplied to the combustion cylinder is appropriate and stable with a simple structure. As a result, complete combustion was possible without disturbing the flame. As a result, the carbon monoxide in the exhaust gas has an excellent effect of being suppressed to a minimum under any condition.

[Brief description of drawings]

FIG. 1 is a sectional view of a liquid fuel combustion apparatus according to an embodiment of the present invention, FIG. 2 (a) is a plan view of a combustion cylinder thereof, and FIG.
Is a rear view, (c) is a side view, and FIG. 3 is a sectional view of a conventional liquid fuel combustion apparatus. In the figure, 1 is a vaporizer, 2 is a vaporization chamber, 3 is a throat, 4 is a heater, 5 is an oil supply pipe, 6 is a nozzle, 6a is a nozzle hole, 7 is a communicating pipe, 8 is a needle pipe, 9 is a needle, and 10 is a Solenoid valve, 11 valve, 12 thermistor, 13 air intake hole, 14 oil supply pipe, 15 oil pump, 16 oil tank, 17 flame plate,
18 is a blower, 19 is a combustion cylinder, 20 is a secondary air hole, 21 is a combustion chamber, 22 is a body casing, 23 is a bottom plate, 24 is flame, 25 is air, 26 is combustion gas, 27 is a hot air mixing chamber, 28 is an air inlet. The same reference numerals in the drawings indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A combustor for vaporizing and burning liquid fuel,
A combustion cylinder surrounding the combustor for guiding the combustion gas discharged from the combustor to an upper opening thereof; and a blower provided on the rear side of the combustion cylinder for delivering the combustion gas to the outside. In the liquid fuel combustion apparatus, the upper part of the side wall surface of the blower in the combustion cylinder,
A liquid fuel combustion apparatus characterized in that an air inlet for allowing a part of the air blown from the blower to flow into the combustion cylinder is provided at a position lower than an upper end portion of a wall surface facing the side wall surface of the blower. .