JPS6222361B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a combustion device for an open type kerosene stove or hot air heater that vaporizes and burns liquid fuel.

Conventionally, this type of combustion device is shown in Figure 3.
A combustion chamber 1 and an outer cylinder 2 are provided around the outer periphery of the combustion chamber 1 to form a combustion air passage 3, and a blower fan 4 is attached to the bottom of the outer cylinder 2. and combustion chamber 1
A rectifier plate 5 is provided in the air passage 3 at the lower part of the airflow path 3. Further, numerous small holes 6 and a ring-shaped flame expansion plate 8 are provided in the side wall 7 of the combustion chamber. Further, one end of the fuel supply pipe 13 passes through the lower part of the combustion chamber side wall 7 and the outer cylinder 2 and faces into the combustion chamber 1, and the other end is connected to the fuel tank 15 via an oil leveler 21.

When burning liquid fuel in such a configuration, the liquid fuel passes through the oil leveler 21 and flows into the fuel supply pipe 12 by utilizing the head difference between the fuel tank 15 and the fuel tank 15.
and is supplied to the bottom of the combustion chamber 1.

On the other hand, combustion air that has driven the blower fan 4 and passed through the baffle plate 5 in the blower path 3 is supplied into the combustion chamber 1 through small holes 6 provided in the side wall 7 of the combustion chamber. When ignited by an ignition source (not shown), combustion starts from a part of the liquid fuel that has flowed into the bottom of the combustion chamber 1, and as the liquid fuel gradually vaporizes due to the heat of the combustion flame, it is ignited from the small hole 6. When the liquid fuel mixes with the combustion air and approaches the prescribed combustion, and the temperature at the bottom of the combustion chamber 1 reaches the vaporization temperature of the liquid fuel, the liquid fuel flowing from the fuel supply pipe 12 instantly turns into vaporized gas and flows into the combustion chamber. 1
and mix with combustion air to form a good flame. The combustion flame in this state is stirred by the flame expansion plate 8 to maintain a better combustion state.

However, looking at the combustion form, when igniting, the combustion chamber 1
Since the bottom is in a low temperature state, the flame itself is red and forms a diffuse combustion, and the combustion gradually increases.
It takes a long time to start up to steady combustion, and soot is generated, resulting in incomplete combustion. Then, the inside of the combustion chamber 1 becomes high temperature, and the liquid fuel is instantaneously vaporized, and a diffused blue flame is formed in the small hole 6. However, since the combustion chamber 1 itself has no heat capacity, the oil leveler 21 is used to extinguish the fire. If the fuel supply is stopped, even if the liquid fuel remaining in the fuel supply pipe 12 flows into the combustion chamber 1, it will not be combusted.

In addition, the flame formed in the small hole 6 gradually becomes smaller and the inside of the combustion chamber 1 tends to cool down.
Along with this, the flame changes from blue flame to red flame. Even during this period, incomplete combustion occurred, resulting in the generation of soot and carbon monoxide. In addition, there were some that installed an electric heater in the middle of the liquid fuel passage to heat and vaporize the fuel, but it was passed through the heater only when igniting, and the electricity to the heater was controlled on and off, so it was difficult to vaporize the fuel. The condition is unstable and there are problems with tar adhesion and heater durability.

Furthermore, there was a method in which a fiber containing fuel was brought into direct contact with a coiled heater, and the amount of vaporization was varied depending on the heater power, but the amount of vaporization gradually increased as the heater began to be energized, and conversely, the energization stopped. In some cases, the amount of vaporization gradually decreases, so incomplete combustion during this period is unavoidable, and there are also problems with the amount of vaporization fluctuating due to changes in room temperature and oil temperature, and tar adhesion.

The present invention consists of a combustion chamber that burns liquid fuel, a heating device in which a planar heating element is built into a pipe and covered with ceramic material, and a fuel supply device that introduces liquid fuel into the pipe of this heating device. , the tip of the pipe of the heating device is configured to face into the combustion chamber, and a controller is provided for steplessly interlockingly controlling the electrical output of the heating device according to the fuel flow rate from the fuel supply device. , which solves the above-mentioned conventional drawbacks.

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

Note that the same members as in the conventional example will be described with the same reference numerals.

In Fig. 1, 1 is a cylindrical combustion chamber with a bottom.
An outer cylinder 2 is provided on the outer periphery of the combustion chamber 1 to form a combustion air passage 3, and a blower fan 4 is provided at the lower part of the outer cylinder 2. 5 is a rectifying plate provided in the air passage 3 at the bottom of the combustion chamber 1, 6 is a countless number of small holes provided in the side wall 7 of the combustion chamber, and 8 is a ring-shaped flame expansion plate provided in the side wall 7 of the combustion chamber. . Reference numeral 9 denotes a heating device that extends through the outer cylinder 2 and the side wall 7 of the combustion chamber and faces the lower part of the combustion chamber 1. As shown in FIG. is built in, and one end of the pipe 10 is connected to a fuel supply pipe 12. 13 is a fuel supply device connected to the fuel supply pipe 12; 14 is a controller that controls the output of the planar heating element 11 in accordance with the combustion flow rate from the fuel supply device 13; and 15 is a fuel tank.

When burning liquid fuel in the combustion device configured in this way, the controller 14 operates to cause the planar heating element 11 to generate heat to maintain the pipe 10 in a high temperature state, and also to drive the fuel supply device 13. The liquid fuel is supplied to the fuel supply pipe 12 and the heating device 9.
The fuel is supplied into the combustion chamber 1 through the pipe 10 .
When liquid fuel is supplied into the combustion chamber 1, it is instantaneously vaporized because the pipe 10 is heated to a high temperature by the planar heating element 11.

On the other hand, combustion air that drives the blower fan 4 and passes through the baffle plate 5 provided in the blower path 3 is supplied into the combustion chamber 1 through the small hole 6 provided in the side wall 7 of the combustion chamber. By igniting with an ignition source (not shown), the vaporized fuel vaporized in the pipe 10 of the heating device 9 is instantly ignited, and the combustion air from the small holes 6 and the vaporized fuel are mixed. The flame is further stirred by the flame expansion plate 8, and a stable blue flame is formed in the small hole 6. The output of the heating device 9 is continuously controlled by the controller 14 in accordance with the fuel flow rate from the fuel supply device 13, so that even if the combustion amount is adjusted, the temperature of the vaporizing surface is always constant and vaporization is performed. maintained at optimal temperature.

In addition, when the supply of liquid fuel is stopped when extinguishing a fire, the fuel supply pipe 12 and the pipe 1 of the heating device 9
The fuel remaining in the pipe 10 is vaporized by the heat generating element 11 built into the pipe 10 and completely combusted.
There is no incomplete combustion during extinguishing the fire, and therefore excellent combustion characteristics can be obtained without generating soot or carbon monoxide.

As is clear from the above description, the combustion device of the present invention includes a combustion chamber for burning liquid fuel, a heating device in which a heating element is built into a pipe and covered with ceramic material, and a liquid fuel in the pipe of this heating device. and a controller for steplessly interlockingly controlling the output of the heating device according to the fuel flow rate from the fuel supply device.
When igniting liquid fuel, the pipe is heated to a high temperature using a planar heating element, and the liquid fuel passing through the pipe is instantly vaporized and ignited, and the rise time until steady combustion is extremely short, making it possible to eliminate soot. and carbon monoxide. Furthermore, by steplessly interlockingly controlling the electrical output so that the temperature of the heating device that vaporizes the fuel is always at the optimum temperature according to the fuel flow rate, stable vaporization and tar generation can be prevented, and the durability of the heating device can be increased. can improve sex.

In addition, when the supply of liquid fuel is stopped during fire extinguishing, when the fuel remaining in the fuel supply pipe flows into the combustion chamber, the pipe is heated by the sheet heating element, so it instantly vaporizes and completely burns inside the combustion chamber. A combustion device having excellent combustion characteristics can be provided.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view of a combustion device showing an embodiment of the present invention, Fig. 2 is a side sectional view showing the main parts of Fig. 1, and Fig. 3 is a side sectional view of a combustion device showing a conventional example. It is. 1... Combustion chamber, 9... Heating device, 10... Pipe, 13... Fuel supply device.

Claims (1)

[Claims] 1. A combustion chamber that burns liquid fuel, a heating device with a heating element built into a pipe and covered with ceramic material,
A combustion device comprising a fuel supply device that introduces liquid fuel into a pipe of the heating device, and a controller that continuously controls the output of the heating device in accordance with the fuel flow rate from the fuel supply device.