JPH0313713A - Evaporative kerosene burning apparatus - Google Patents

Abstract

PURPOSE:To supply air by making use of the breathing action of the evaporating chamber by either switching on and off an electric heater at the time of a burning off operation by using a temperature detecting means and a control means or changing the applied voltage so as to change the temperature in the evaporating chamber by greater than 10 degrees. CONSTITUTION:A thermistor 7 as a temperature detecting means is attached to a part of the evaporator main body 1 to detect the temperature in the evaporating chamber 3. The signal from the thermistor 7 is inputted to a micro computer 9 which serves as a control means. A switch 10 is serially connected to an electric heater 2, and the control signal 11 for the micro computer 9 is transmitted to the switch 10. In response to the signal 8 from the thermistor 7 corresponding to the burning off temperature t1 of the evaporating chamber 3, the power supply to the electric heater 2 is stopped, and, in response to the signal from the thermistor 8 corresponding to t2, the power supply to the electric heater is resumed. This way, the temperature in the evaporating chamber 3 is controlled within the range of t1 to t2. By this constitution, the fuel pump can be prevented from operating when there is no fuel to pump, and the air can be automatically supplied to the evaporating chamber.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention provides a wick for the purpose of stabilizing vaporization in the vaporization chamber of a vaporizer body equipped with an electric heater, supplies kerosene into this vaporization chamber, and vaporizes it here. This invention relates to a vaporizing oil combustor in which vaporized gas is guided to a gas injection nozzle and combusted in a burner.

Conventional technology In conventional oil combustors of this type, residue adheres to the wick of the vaporizing chamber as the combustion time passes, clogging the vaporized gas passage, reducing the amount of kerosene supplied and the amount of vaporized gas generated, and causing poor combustion conditions. Deteriorate.

For this purpose, the temperature inside the vaporization chamber is raised to a temperature higher than the normal vaporization temperature, that is, the air firing temperature, and this temperature is maintained for a certain period of time (air firing period), during which time the fuel pump is run dry to supply air into the carburetor. , the residue is removed. (
(Japanese Patent Publication No. 63-67088) Problems to be Solved by the Invention The first drawback of the above-mentioned prior art is that the kerosene in the fuel reservoir (fuel tank) is drained in order to supply air into the vaporization chamber by running the fuel pump dry. It was something that had to be removed.

In other words, it takes time and effort to drain the kerosene, and hands get dirty as a result of the draining work.

A second drawback of the prior art was that it required treatment of the extracted kerosene.

In other words, when used again in a vaporizing oil combustor, residue is generated in the vaporizing chamber again, and the combustion condition deteriorates in a short period of time.

A third drawback of the prior art is that the life of the fuel pump is shortened due to the fuel pump running dry.

In other words, the fuel pump is used to supply kerosene, and the lubricity of the plunger is reduced.

Problems to be Solved by the Invention The present invention has been made to eliminate the above-mentioned drawbacks of the prior art, and is designed to stop the fuel pump from running dry and to automatically supply air into the vaporization chamber.

For this purpose, there is a temperature detection means for detecting the temperature of the vaporization chamber heated by an electric heater, and upon receiving a signal from this detection means, electricity is supplied to the electric heater to raise the temperature inside the vaporization chamber to an air furnace temperature higher than that during normal combustion. It is equipped with a control means that repeats the cycle of raising the temperature, holding it for a certain period of time, lowering it by 10 degrees or more from the empty furnace temperature, and then energizing the electric heater again to raise the temperature to the empty furnace temperature twice or more.

In order to eliminate the residue present in the working vaporization chamber, it is necessary to carry out dry firing, but for this purpose it is necessary to supply air as an oxidizing agent by some method.

In the present invention, the respiration effect of the vaporization chamber is utilized by turning the electric heater ON-OFF during dry firing using the temperature detection means and the control means, or by changing the applied voltage to change the temperature within the vaporization chamber by at least 10 degrees. It is something that sends air.

The breathing action of the vaporization chamber is performed by expansion of the gas in the vaporization chamber and contraction due to liquefaction of the gas within the vaporization chamber, and air is supplied when the temperature inside the vaporization chamber drops.

Example Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows a cross-sectional structure of a carburetor to which the present invention is applied.

This vaporizer consists of a cylindrical carburetor main body 1 made of a good heat conductor such as brass, a cylindrical electric heater 2 made of a sheathed heater inserted into the main body 1, and an inner wall of the main body 1 and the heater 2. The vaporization chamber 3 formed, a wick 4 made of a porous sintered body or wire mesh for stabilizing the evaporation of the kerosene inserted into the vaporization chamber 3, and a wick 4 connected to the inlet and outlet sides of the vaporization chamber 3, respectively. It is composed of an oil feeding vibrator 5 and a gas injection nozzle 6.

In this vaporizer, when kerosene is supplied into the vaporization chamber 3 through the oil pipe 5, it is vaporized in the wick 4, supplied to the nozzle 6 as vaporized gas a, and burned in a burner (not shown).

If this combustion continues for a long time or if degraded kerosene is used, residue will gradually form in the vaporizing chamber 3, clogging the wick 4, and increasing the flow resistance of kerosene or vaporized gas. The supply amount decreases, and the amount of vaporized gas decreases.

The main component of this residue is solid carbon, and also contains hydrocarbon volatile components.

In order to remove this residue and regenerate the vaporization chamber 3, an air furnace means is required.

FIG. 2 shows the rate of weight loss of the residue in order to remove this residue.

In this figure, the temperature increase rate is 20 deg/min, and the air supply amount is 50 deg/min.
The rate of weight loss of the residue was measured under the conditions of cc/min.

As is clear from the figure, the temperature range is 350'C to 600'C.
It can be seen that the weight loss occurs in the °C region and that the rate of weight loss is highest at around 50 °C.

In other words, it can be seen that the optimum air furnace temperature is 450°C to 530'C.

If air is not supplied, the volatile content in the residue is approximately 30%.
It is known that

Therefore, in order to remove the residue in the vaporization chamber 3, it is necessary to perform dry firing and to supply air.

Therefore, in the present invention, in order to effectively supply air to the vaporization chamber 3, the vaporization chamber 3 is repeatedly heated and cooled.
Air is automatically supplied inside.

An example thereof will be explained with reference to FIG.

First, when the electric heater 2 shown in FIG.
level) ts, and is held here for T1 time.

Thereafter, when the heater 2 is turned off or the voltage is lowered by means described later, the temperature of the vaporization chamber 3 decreases to tl.

During this process, the gas in the vaporization chamber 3 contracts, and when the temperature further decreases, the vaporized gas condenses, so that air is automatically supplied from the atmosphere.

This period is T2 time.

When the electric heater 2 is energized again, the temperature inside the vaporization chamber 3 rises again, and the residue is oxidized by air.

By repeating such heating and cooling, the residue inside the vaporization chamber 3 can be removed.

In other words, in order to supply air into the vaporization chamber 3 by heating and cooling the vaporization chamber 3, the temperature change width (tl-tz) of the vaporization chamber 3 is
By setting 10 degrees or more, air can be automatically supplied effectively.

Now, a specific example of a method for controlling the temperatures t+ and t2 of the vaporization chamber 3 as described above is shown in FIGS. 1 and 4.

First, as shown in FIG. 1, a thermistor 7 serving as a temperature detection means is attached to a part of the vaporizer main body 1 to detect the temperature of the vaporization chamber 3. A signal 8 from this thermistor 7 is input to a microcomputer 9 which is a control means shown in FIG.

On the other hand, an open/close switch 10 is connected in series to the electric heater 2, and a control signal 11 from the microcomputer 9 is sent to this switch IO.
will be sent.

Therefore, the empty cooking temperature t of the vaporization chamber 3! The power supply to the electric heater 2 is stopped by the signal 8 of the thermistor 7 corresponding to t.
The electric heater 2 is energized again by the signal from the thermistor 8 corresponding to 1. In this way, as shown in FIG. 3, the temperature inside the vaporization chamber 3 is controlled between t1 and t2 when the furnace is empty. As another example, the voltage applied to the electric heater 2 can be reduced by a signal from the thermistor 7 corresponding to the temperature 1+ of the vaporization chamber 3, and the temperature of the vaporization chamber 3 can be controlled between tl and t2.

Effects of the Invention The first effect of the present invention is that there is no need to drain the kerosene from the fuel reservoir because the fuel pump is fired without running dry.

The second effect of the present invention is that there is no need to drain the kerosene when performing dry firing, so there is no need to get your hands dirty.

The third effect of the present invention is that the fuel pump does not need to run dry, so the life of the fuel pump is not impaired.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of the vaporizer of the vaporizing oil combustor to which the present invention is applied, Fig. 2 is a diagram showing the rate of weight loss of residue in the vaporizer, and Fig. 3 is a diagram showing the time and temperature during dry firing of the present invention. The temperature characteristic diagram, FIG. 4, is a specific circuit diagram of the same. 1 is the vaporizer main body, 2 is the electric heater, 3 is the vaporization chamber,
4 is the wick, 7 is the thermistor,
9 is a microcomputer, and IO is an on/off switch.

Claims (1)

[Claims] The vaporization chamber (1) of the vaporizer body (1) equipped with an electric heater (2)
3) A wick (4) is provided inside the chamber, kerosene is supplied into the vaporization chamber (3), and the vaporized gas is guided to a gas injection nozzle (6) where it is combusted by a burner. In the oil combustor, there is a temperature detection means (7) for detecting the temperature of the vaporization chamber (3), and upon receiving a signal from the temperature detection means (7), the electric heater (2) is energized to detect the temperature of the vaporization chamber (3).
3) Raise the temperature to a dry firing temperature higher than that during normal combustion, hold it for a certain period of time, and then increase the temperature by 10 de from the above dry firing temperature.
A vaporizing oil combustor comprising a control means (9) that repeats a cycle of lowering the temperature by more than 100 g and then increasing the temperature by energizing the electric heater (2) again to the dry firing temperature twice or more.