JPH0731085Y2 - Liquid fuel combustion device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a liquid fuel combustion apparatus, and more particularly to a structure for taking in secondary air taken into a combustion cylinder.

[Prior Art] FIG. 3 and FIG. 4 are a structural view and a side sectional view showing a conventional liquid fuel combustion apparatus. In FIG. 3, 1 is a main body case of the apparatus, 2 is a cartridge type fuel tank, 3 is a fuel tray provided directly below this fuel tank, 4 is a fuel tank 2
And liquid fuel contained in the fuel tray 3, 5 is a fuel supply pump, 6 is a fuel supply pipe, 7 is a fuel vaporizing pipe, 8 is a sheath heater for heating the vaporizing pipe, and 9 is a vaporizing pipe 7. A communicating fuel jet nozzle, 10 is an electromagnetic valve for controlling the opening and closing of the nozzle hole of the jet nozzle 9, 11 is a burner with its head inclined rearward, and 12 is an ignition plug for igniting vaporized gas.

In FIG. 4, 13 is a blower fan for sending out the hot air heated by combustion to the front, 14 is a combustion cylinder surrounding the burner 11, and for sending out the hot air as shown in FIG. It is assembled together with the wind tunnel 15.

16 is a heat insulating material for preventing heat leakage, 17 is a burner mount to which the burner 11 is attached, 18 is a combustion flame formed on the burner head, 19 is a warm air outlet of the main body case 1, and 20 is a blower fan 13 This is a cooling air intake for taking in a part of the blown air as cooling air into the lower space of the combustion tube 14.

Next, the operation will be described.

The liquid fuel 4 such as kerosene flows out from the fuel tank 2 in the direction of the arrow, and the liquid fuel 4 in the fuel tray 3 is held on the oil surface of a constant height. On the other hand, when the sheath heater 8 is energized, the vaporization pipe 7 is heated, and when the vaporization pipe 7 reaches a predetermined temperature, the combustion supply pump 5 is driven. As a result, the fuel tray 3
The liquid fuel 4 inside is sent into the vaporizing pipe 7 through the fuel supply pipe 6 and is immediately vaporized therein.

After that, the electromagnetic valve 10 is excited, the needle valve in the fuel injection nozzle 9 is sucked, the nozzle hole is opened, and vaporized gas is ejected into the burner 11. Due to the ejector effect due to the jetting force at this time, the vaporized gas takes in the primary air from the surroundings, enters the burner 11, and is mixed with the primary air. Then, when a spark is generated in the ignition plug 12, the mixture supplied to the burner 11 is ignited to form a flame, the combustion cylinder 14 is heated, and after heat exchange with air, it is mixed with cold air from the blower fan 13 in the wind tunnel 15. Then, it becomes an appropriate warm air and is discharged from the warm air outlet 19.

On the other hand, the cooling air taken in from the cooling air intake 20 is
Cools electric parts and other components provided in the lower space of 14.

When the operation is stopped, the operation of the fuel supply pump 5 is stopped to stop the supply of the liquid fuel 4, and then the solenoid valve 10 is de-energized with a delay of several seconds so that the needle valve in the fuel injection nozzle 9 is opened. This is done by returning the nozzle and closing the nozzle hole at its tip.

[Problems to be Solved by the Invention] As described above, in the conventional liquid fuel combustion apparatus, the burner is arranged with its head tilted backward with respect to the inside of the combustion cylinder in order to make the apparatus compact. , Combustion air was taken in with a differential pressure of only a few mmAq, which is the ejector effect due to the jet output of vaporized gas. Therefore, as shown in FIG. 5, when the warm air outlet 19 is slightly blocked by an obstacle 21 and a pressure loss occurs, the combustion state is unbalanced and the flame 18 of the burner 11 expands. . When this phenomenon occurs, the flame comes into contact with the inner wall surface of the combustion cylinder 14 and is cooled, so that carbon monoxide CO is generated, which is a safety problem.

This invention was made in order to solve the above problems, and even if pressure loss occurs at the hot air outlet, the balance of the combustion state becomes unbalanced, and even if the phenomenon that the flame extends occurs, An object of the present invention is to obtain a liquid fuel combustion device in which carbon oxide CO is less likely to be generated.

[Means for Solving Problems] In a liquid fuel combustion apparatus according to the present invention, vaporized gas of liquid fuel is ejected from a nozzle hole, and the combustion air is burned together with the vaporized gas by an ejector effect by the ejection output of the vaporized gas. In a liquid fuel combustor that takes in the air and burns it, and sends the hot air heated by this combustion to the room by a blower fan, a burner is installed in the lower part of the combustion cylinder with its head facing the inner wall surface of the rear wall of the combustion cylinder. The secondary air intake provided on the bottom surface near the rear wall of the combustion tube and a part of the air blown from the blower fan provided at the rear of the combustion tube while being guided forward. A guide plate leading to the secondary air intake, the air supplied from the secondary air intake is raised along the inner wall surface of the combustion cylinder rear wall, and the flame generated on the burner and the interior of the combustion cylinder rear wall It creates an air curtain between it and the wall.

[Operation] In the liquid fuel combustion apparatus according to the present invention, a part of the air blown by the air blower fan is generated between the flame generated on the burner inclined rearward from the secondary air inlet and the inner wall surface of the combustion cylinder rear wall. Since it is supplied to form an air curtain, the hot air outlet is blocked by obstacles, pressure loss occurs and the combustion state deteriorates, and even if the flame extends, the flame is burned by the air curtain by the secondary air. It will not come in contact with the inner wall surface of carbon monoxide, and the generation of carbon monoxide CO will be prevented as much as possible.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a side sectional view of the liquid fuel combustion apparatus according to the present invention at the time of abnormal operation, and FIG. 2 is an inclined view of the combustion cylinder assembly viewed from the bottom side. The parts corresponding to those of the conventional example shown in FIGS. 3 to 6 are designated by the same reference numerals, and the description thereof will be omitted.

In FIGS. 1 and 2, reference numeral 22 denotes a secondary air inlet, which is provided on the bottom surface 14a near the rear wall of the combustion cylinder 14. Reference numeral 23 is a guide plate bent in a substantially L shape, and is a bottom surface 14a of the combustion cylinder 14.
It is attached by spot welding etc. to the cooling air inlet 20
A part of the cooling air coming from the blower fan 13 hits the guide plate and is guided forward, and is guided to the secondary air inlet 22.

Next, the operation of the combustion device having the configuration of the above embodiment will be described.

The air blown from the blower fan 13 flows as shown by the arrow in FIG.
A part of the air passes through the cooling air intake 20 and hits the guide plate 23, and while moving forward, the cooling air exiting from both sides of the guide plate 23 and the secondary air intake 22 enter the combustion tube 14. Separated from the secondary air, the secondary air rises along the inner wall surface of the combustion tube 14 so as to form an air curtain.

Therefore, even if a situation in which the obstacle 21 blocks the hot air outlet 19 to cause a pressure loss and the combustion state is unbalanced and the flame 18 extends, the air curtain by the secondary air causes combustion. Since the flame 18 does not come into contact with the inner wall surface of the cylinder 14 and the flame 18 is not cooled, generation of carbon monoxide CO is suppressed.

According to the experiment, when the hot air outlet 19 was blocked by about 1/2, in the case of the conventional example, carbon monoxide CO of about 50 ppm was generated at the hot air outlet 19, but according to the configuration of this embodiment, It was confirmed to be 1 ppm or less, which is almost the same level as the state where the hot air outlet 19 is not blocked.

In the above embodiment, the guide plate 23 is L-shaped,
I opened both sides, but if you close both sides,
The amount of secondary air taken into the combustion tube 14 from the secondary air inlet 22 is further increased, and the air curtain effect can be further improved.

[Effect of the Invention] As described above, according to the present invention, the vaporized gas of the liquid fuel is ejected from the nozzle hole, and the ejecting effect of the vaporized gas ejects the combustion gas into the burner together with the vaporized gas. In a liquid fuel combustion device that burns and sends the warm air heated by this combustion to the room by a blower fan, a burner is installed in the lower part of the combustion cylinder so that its head is inclined toward the inner wall surface of the rear wall of the combustion cylinder. And a secondary air intake provided on the bottom surface near the rear wall of the combustion cylinder and a part of the air blown from a blower fan provided at the rear of the combustion cylinder to the front and a secondary air intake. And a guide plate for guiding the air to rise from the secondary air intake along the inner wall surface of the combustion cylinder rear wall, and between the flame generated on the burner and the inner wall surface of the combustion cylinder rear wall. Air mosquito By creating a heater, even if the hot air outlet is blocked by obstacles, pressure loss occurs at the hot air outlet, the combustion state is out of balance, and the flame of the burner extends, Since the flame of the burner is prevented from coming into contact with the inner wall surface of the combustion cylinder by the air curtain of the secondary air and the generation of carbon monoxide CO is suppressed, the effect that a highly safe liquid fuel combustion device can be obtained is obtained. is there.

[Brief description of drawings]

1 is a side sectional view showing an embodiment of the liquid fuel combustion apparatus of the present invention during abnormal operation, and FIG. 2 is a perspective view of its combustion cylinder assembly,
FIG. 3 is a front sectional view showing a conventional liquid fuel combustion apparatus, FIG. 4 is a side sectional view thereof, FIG. 5 is a side sectional view of the same during abnormal operation, and FIG. 6 is a perspective view of the combustion cylinder assembly thereof. It is a figure. In the figure, 1 is a main body case, 11 is a burner, 13 is a blower fan, 14 is a combustion cylinder, 14a is its bottom surface, 18 is a flame, 20 is a cooling air intake, 22 is a secondary air intake, and 23 is a guide plate. Is. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] 1. A vaporized gas of liquid fuel is jetted from a nozzle hole, and combustion air is taken into the burner together with the vaporized gas by the ejector effect of the jetted output of the vaporized gas and burned, and heated by this combustion. In a liquid fuel combustion device that blows warm air into a room by a blower fan, the burner is arranged in the lower part of the combustion cylinder such that its head is inclined toward the inner wall surface of the rear wall of the combustion cylinder. A secondary air inlet provided on the bottom surface near the wall, and a guide plate that guides part of the air blown from the blower fan provided at the rear of the combustion cylinder forward and leads to the secondary air inlet. The air supplied from the secondary air inlet is raised along the inner wall surface of the combustion cylinder rear wall, and between the flame generated on the burner and the inner wall surface of the combustion cylinder rear wall. A liquid fuel combustion device characterized by creating an air curtain.