JPH0328655B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Technical Field> The present invention relates to a vaporization type combustor such as an oil fan heater that vaporizes liquid fuel and burns it with a burner.

<Prior art> In a vaporization fuel device that gasifies liquid fuel in a vaporizer and burns it in a burner, vaporization occurs when poor quality fuel (altered kerosene, etc.) is used or even normal kerosene is burned for a long time. Tar adhered to and accumulated inside the vessel, vaporizing element, nozzle, etc., causing problems such as changes in combustion conditions and a decrease in calorific value.
To eliminate this problem, simply clean the vaporizer.

FIG. 3 is a diagram showing the main part of the carburetor part in a general vaporization type combustor. The cleaning operation of the conventional oil fan heater will now be explained. A supply pump 2 is attached to the upper part of the fuel tank 1, and when the supply pump 2 is driven, oil is supplied to the carburetor 4 via an oil supply pipe 3. The carburetor 4 has a fuel inlet portion 4a and a vaporization chamber 4b.
A vaporizing element 4c made of metal mesh, foamed metal, etc. is filled in this. A heater 6 as a heating means is attached to the mounting surface of the outer peripheral wall of the vaporizer 4 and is controlled to be energized by an appropriate temperature detector 5, and the vaporizer 4 is kept at an appropriate temperature by this heater 6. heated. A gas jet nozzle 7 is attached to the upper part of the vaporizer 4, and a gas ejection nozzle 7 is attached to the upper part of the vaporizer 4.
The fuel gas vaporized inside is ejected into the cleaning inlet. 9 is a return pipe for returning residual fuel in the carburetor 4 to the tank 1 when extinguishing a fire. 10 is a solenoid valve that returns to the fuel tank 1 and a cleaning rod 1
It is a solenoid body that is integrated with a solenoid that drives solenoid 1. When energized, the cleaning rod 11 is driven to close the gas jet nozzle 7, and the fuel return valve is opened to return fuel to the fuel tank 1. There is. Further, 12 is a tank-side solenoid valve that opens and closes in conjunction with the fuel return valve.

FIG. 4 shows the relationship between the conventional cleaning time chart and the vaporizer temperature. When cleaning starts, the heater 6 is energized and the vaporizer 4 is heated. The temperature detector 5 controls the power supply to the heater 6, and the temperature of the vaporizer 4 is adjusted to the temperature of the heater 6 during cleaning.
OFF temperature Tch and heater ON temperature during cleaning
Hold between Tcl. The supply pump 2 may be stopped during cleaning, but it is better to operate it to send air to the carburetor 4 to remove carbon attached to the fuel inlet 4a, vaporization chamber 4b, vaporization element 4c, and gas jet nozzle 7. Drive because it has a big effect. When cleaning, the fuel in the fuel tank 1 should be drained.

Fuel tends to remain inside the carburetor 4, especially in the vaporization element 4c. This residual oil vaporizes in the early stages of cleaning and comes out as white smoke from the gas jet nozzle 7, so the solenoid body 1
The white smoke (residual fuel vaporized gas) is returned to the fuel tank 1 by energizing the valve 0 and closing the gas ejection nozzle 7 with the cleaning rod 11 and opening the fuel return valve of the solenoid body 10. When the residual fuel is completely vaporized, the energization to the solenoid body 10 is stopped, the gas jet nozzle 7 is closed, and the air pumped by the supply pump 2 passes through the inside of the carburetor 4 and exits the gas jet nozzle 7. Let it come out.

However, in the above control, it is assumed that the user mistakenly refills the fuel tank 1 from which oil has been drained during cleaning. Then, the fuel is sucked up by the supply pump 2 and sent under pressure to the carburetor 4. vaporizer 4
Since the temperature is high, the fuel vaporizes and continues to be blown out from the gas jet nozzle 7. This causes vaporized gas to be emitted into the room, which is dangerous, and the room is filled with odors, causing discomfort.

<Purpose> In view of the above, the present invention prevents the release of vaporized gas, ensures safety, and improves comfort by preventing the generation of odors even if the user mistakenly refuels during cleaning operation. The purpose is to provide a vaporization type combustor that can be secured.

<Example> An example of the present invention will be described below with reference to FIGS. 1 to 3. The vaporization type combustor according to the present invention includes a supply pump 2 that pumps liquid fuel from a fuel tank 1, A vaporizer 4 with a vaporizing element 4c that vaporizes the liquid fuel pumped by the supply pump 2, an ejection nozzle 7 that ejects the vaporized fuel vaporized by the vaporizer 4 toward the burner 8, and heats the vaporizer 4. The control circuit 14 includes a heating means 6, a temperature detector 5 for detecting the temperature of the vaporizer 4, and a control circuit 14 for controlling the heating means 6 based on an output signal of the temperature detector 5. A function of performing a cleaning operation in which the temperature of the vaporizer 4 is set higher than that during normal combustion to incinerate deposits in the vaporizer 4, and a function of performing a cleaning operation in which the temperature of the vaporizer 4 is set to a predetermined temperature during the cleaning operation.
It has a function to stop the cleaning operation when the temperature drops to Tx.

The control circuit 14 is a general microcomputer, etc., and as shown in FIG. The heater 6 and the supply pump 2 are connected. Further, connected to the input side of the control circuit 14 are the temperature detector 5 made of a thermistor or the like, and an operation panel 15 for setting and instructing cleaning operation, combustion start, etc. The other configuration shown in FIG. 3 is <prior art>
Since it is explained in , I will omit it.

FIG. 1 shows the relationship between the time chart and temperature of the cleaning operation in the present invention, and the cleaning operation will be explained based on this diagram. The safety set temperature Tx during cleaning is set at a temperature lower than the heater ON temperature Tcl during cleaning and higher than To of the vaporizer 4 during normal combustion. Here, it is assumed that the user mistakenly refuels after a time t1 has elapsed since the cleaning operation was started and the temperature of the vaporizer 4 was started to be controlled between Tcl and Tch. The fuel pressure-fed into the vaporizer 4 by the supply pump 2 is vaporized here, but the temperature of the vaporizer 4 is temporarily and rapidly lowered by the heat of vaporization at this time. Here, the temperature of the vaporizer 4 is detected by the temperature detector 5, and the cleaning operation is stopped at t2 when the temperature of the vaporizer 4 falls below the safe cleaning temperature setting Tx. That is, the power supply to the heater 6, the operation of the supply pump 2, and the solenoid body 10 are simultaneously stopped. As a result, the gas jet nozzle 7 is closed by the cleaning rod 11 and the fuel return valve is opened, so that the vaporized gas returns to the fuel tank 1.

As a result of the above, vaporized gas does not continue to be emitted, and the inconveniences described in <Prior Art> can be prevented.
The supply of electricity to the solenoid body 10 is stopped when the vaporization temperature falls to a temperature at which the vaporized gas liquefies.

It should be noted that the present invention is not limited to the above embodiments, and it goes without saying that many modifications and changes can be made to the above embodiments within the scope of the present invention.

<Effects> As is clear from the above description, the present invention provides a vaporizer with a vaporizing element that vaporizes liquid fuel supplied from a fuel tank by a supply pump, and a vaporizer that injects the vaporized fuel vaporized by the vaporizer toward the burner side. A jet nozzle, a heating means for heating the carburetor, a temperature detector for detecting the temperature of the carburetor, and a control circuit for controlling the heating means based on an output signal of the temperature detector; The liquid level of the liquid fuel is lowered or emptied, and only air is sent from the supply pump to the vaporizer, and the temperature of the vaporizer is set higher than that during normal combustion, and the deposits in the vaporizer are incinerated. In the vaporization type combustor capable of performing a cleaning operation, the control circuit performs a cleaning operation when the temperature of the vaporizer decreases to a predetermined temperature due to incorrect supply of liquid fuel to the vaporizer during the cleaning operation. It is equipped with a function to cancel the operation.

Therefore, according to the present invention, even if the user mistakenly refuels during the cleaning operation, it is possible to prevent the release of vaporized gas and ensure safety, and also to prevent the generation of odor and ensure comfort. It has excellent effects.

[Brief explanation of drawings]

Fig. 1 is a diagram showing the relationship between a time chart of a cleaning operation and the temperature of the vaporizer according to an embodiment of the present invention, Fig. 2 is a control block diagram of the same, and Fig. 3 is a main part configuration of the vaporizer section. FIG. 4 is a diagram showing the relationship between the time chart of a conventional cleaning operation and the temperature of the vaporizer. 1: fuel tank, 2: supply pump, 4: vaporizer, 4c: vaporization element, 5: temperature detector, 6: heating means, 7: jet nozzle, 8: burner, 14: control circuit.

Claims (1)

[Scope of Claims] 1. A carburetor with a vaporization element that vaporizes liquid fuel supplied from a fuel tank by a supply pump; an ejection nozzle that ejects the vaporized fuel vaporized by the vaporizer toward a burner; and the vaporizer. A heating means for heating the vaporizer, a temperature detector for detecting the temperature of the vaporizer, and a control circuit for controlling the heating means based on an output signal of the temperature detector, and lowering the liquid level of the liquid fuel in the fuel tank. Alternatively, it is possible to conduct a cleaning operation in which the vaporizer is emptied and only air is force-fed from the supply pump to the vaporizer, and the temperature of the vaporizer is raised to a higher temperature than during normal combustion, and the deposits in the vaporizer are incinerated. In the vaporization type combustor, the control circuit has a function of stopping the cleaning operation when the temperature of the vaporizer falls to a predetermined temperature due to incorrect supply of liquid fuel to the vaporizer during the cleaning operation. This is a vaporizing combustor that is characterized by: