JPH0133964Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a vaporized liquid fuel combustion device in which liquid fuel is vaporized in a vaporizer and combusted in a burner section.

[Technical background of the invention]

For example, a vaporization-combustion oil stove has a structure in which oil from a fuel tank is supplied to a vaporizer that is heated to a predetermined vaporization temperature by a heater, and the vaporized oil gas is combusted in a burner section.

[Problems with background technology]

However, the above configuration has the disadvantage that when used for a long period of time, the oil does not vaporize normally in the vaporizer, resulting in incomplete combustion or spontaneous extinguishing during use. This is because the tar in petroleum does not vaporize at the normal vaporization temperature of petroleum, but remains in the vaporizer and gradually accumulates.

[Purpose of the invention] Therefore, the purpose of the invention is to be able to remove impurities such as tar when they accumulate in the vaporizer and maintain a normal combustion state, and to automatically remove the impurities. The object of the present invention is to provide a vaporized liquid fuel combustion device that can be used.

[Summary of the idea]

The present invention provides an abnormal combustion detection device in the burner section, and when abnormal combustion is detected by this device, a solenoid valve provided between the carburetor and the fuel tank is closed to cut off the supply of liquid fuel to the carburetor. This method is characterized in that the vaporizer is heated by a heater to a higher temperature than the normal vaporization temperature, thereby vaporizing or decomposing impurities within the vaporizer.

[Example of idea]

An embodiment in which the present invention is applied to a kerosene stove will be described below with reference to the drawings. Reference numeral 1 denotes an oil receiver, to which a cartridge-type fuel tank 2 storing petroleum as liquid fuel is removably attached.
Oil is supplied from the fuel tank 2 so as to maintain a constant liquid level. Reference numeral 3 denotes a pump case connected to the oil receiver 1 via a normally closed solenoid valve 4, which is equipped with an electromagnetic pump 5.
Furthermore, the oil in the fuel tank 2 can be supplied to the carburetor 6 by the electromagnetic pump 5. The vaporizer 5 includes a heater 7 and a temperature sensing element 8 (both of which have a third
(only shown in the figure) is provided, and by turning off the heater 7 based on the temperature detected by the temperature sensing element 8, the interior can be heated to about the vaporization temperature of petroleum. Reference numeral 9 denotes a burner section, which burns the vaporized petroleum gas ejected from the nozzle 6a of the vaporizer 6. As shown in FIG. 2, the burner section 9 is provided with a flame rod 10 insulated from the burner section 9. The flame rod 10 has a burner section 9 at its tip.
It is installed so as to be located in the flame generated in the burner section 9, and a voltage is applied between it and the burner section 9. When the combustion state in the burner section 9 is normal, a current flows through the flame between the flame rod 10 and the burner section 9, so that the combustion state is normal in the electronic control circuit 11 shown in FIG. is judged. Furthermore, if the flame in the burner section 9 jumps or becomes a red flame, causing abnormal combustion, the current between the flame rod 10 and the burner section 9 is cut off. is detected. These flame rod 10 and electronic control circuit 11 constitute an abnormal combustion detection device. A return pipe 12 communicates the vaporizer 6 and the pump case 3 via a normally open electromagnetic valve 13.

Next, the electrical configuration will be explained based on FIG. 17
is a current fuse, 15 and 16 are overheating thermoswitches, 17 is a temperature fuse, 18 is a seismic switch,
19 is a self-holding type relay, and 20 is an operation switch. When the operation switch 20 is closed between contact pieces (a-b), the relay switch 19a of the relay 19 is closed. Next, move the operation switch 20 to the contact piece (a-
c) When the switch is switched to the closed state, power is supplied to the electronic control circuit 11, and the signal from the electronic control circuit 11 causes the triax 21 provided in series with the heater 7 to
is turned on and the heater 7 is energized. When the vaporizer 6 is heated to the normal vaporization temperature of oil by energizing the heater 7, this is detected by the temperature sensing element 8, and an activation signal for the relay 22 is output from the electronic control circuit 11, and the relay switch is activated. 22a, 22b
closes. As a result, the electromagnetic pump 5, the ignition transformer 23, the fan motor 24, the electromagnetic valve 4, and the electromagnetic valve 13 are energized, so that the oil in the oil receiver 1 passes through the pump case 3 and is transferred to the vaporizer 6 by the electromagnetic pump 5. The petroleum gas vaporized here is ejected into the burner section 9 by the discharge pressure of the electromagnetic pump 5 and is combusted. In addition, 25 is an electronic control circuit 1
1 is a relay that is activated when abnormal combustion is detected, and this relay switch 25a is a relay that is activated when abnormal combustion is detected.
1, and the relay switch 25b is provided in series with the electromagnetic pump 5. Note that 26 is an indicator lamp that is turned on when the electronic control circuit 11 detects abnormal combustion.

Now, in the above configuration, since the tar contained in petroleum does not vaporize at the normal vaporization temperature of petroleum, it remains in the vaporizer 6 and gradually accumulates when used for a long period of time. When the accumulated amount of tar increases, the amount of vaporized in the vaporizer 6 decreases, resulting in an abnormal state in which combustion in the burner section 9 causes sparks or red flames. Then, the current between the burner section 9 and the flame rod 10 is cut off, so the electronic control circuit 11 detects abnormal combustion and cuts off the power to the relay 22, while energizing the relay 25. Since the relay switches 22a and 22b are opened due to power outage of the relay 22, the electromagnetic pump 5,
Ignition transformer 23, fan motor 24, solenoid valve 4
Then, the electromagnetic valve 13 is cut off, and combustion in the burner section 9 is stopped with the electromagnetic valve 4 closed. On the other hand, by energizing the relay 25, the relay switch 2
5a and 25b are closed, the heater 7 is energized to heat the vaporizer 6, and the electromagnetic pump 5 is driven again. In this case, the heater 7 is energized by a relay switch 25 provided in parallel with the triax 21.
Since the vaporization is carried out through a, even if the vaporizer 6 is heated above the normal vaporization temperature, the power is not cut off, and the vaporizer 6 is heated to a higher temperature than the normal vaporization temperature. Therefore, the tar accumulated in the vaporizer 6 is vaporized or thermally decomposed, and the vaporized gas is discharged from the nozzle 6a by the discharge pressure of the electromagnetic pump 5, and the tar is automatically removed. Note that even if the electromagnetic pump 5 is driven at this time, the oil in the oil receiver 1 will not be supplied into the vaporizer 6 because the electromagnetic valve 4 is shut off and closed. When a predetermined period of time has elapsed, a signal is output from the timer circuit configured in the electronic control circuit 11, and the relay 25 is de-energized and the relay 19 is energized, thereby returning to the normal operating state and the burner section 9 The combustion of oil and gas in the area will be resumed.

[Effect of idea]

As described above, when the abnormal combustion detection device detects abnormal combustion in the burner section, the present invention closes the solenoid valve installed between the carburetor and the fuel tank to supply liquid fuel to the carburetor. The feature is that the vaporizer is heated to a higher temperature than the normal vaporization temperature by a heater, and even if impurities such as tar accumulate in the vaporizer, this can be automatically removed. This has the practical effect of being able to maintain a normal combustion state.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a schematic diagram of the main parts, FIG. 2 is a perspective view of the burner section, and FIG. 3 is an electric circuit diagram. In the drawing, 2 is a fuel tank, 4 is a solenoid valve, 6 is a carburetor, 7 is a heater, 9 is a burner section, and 10 is a flame rod.

Claims (1)

[Scope of utility model registration request] Liquid fuel from a fuel tank is supplied to a vaporizer and vaporized, and the liquid fuel is combusted in a burner section, in which an abnormal combustion detection device is provided in the burner section, and an abnormal combustion detection device is provided between the fuel tank and the vaporizer. A solenoid valve is provided in the vaporizer, and when abnormal combustion is detected by the abnormal combustion detection device, the electromagnetic valve is closed and the vaporizer is heated to a higher temperature than the normal vaporization temperature by a heater provided in the vaporizer. A vaporizing liquid fuel combustion device characterized by: