JPH04110510A - Combustion apparatus - Google Patents

Abstract

PURPOSE:To carry out detection of a flame by a thermistor stably by a method wherein the number of burner ports in a local area on an inner column or outer column, located nearby a detecting element of the thermistor, is made larger than that in other area. CONSTITUTION:A local area A on an inner column 31, located nearby a detecting element 21 of a thermistor 20, is provided with a larger number of burner ports 61 than other area. When operation is started, a seathed wire heater 11 is energized. Kerosene sent to a vaporizer column 10 by a magnetic pump 80 is vaporized by the seathed wire heater 11 and flows upward through vaporized kerosene outlet 12 on the ceiling. The vaporized kerosene is ignited by an ignitor and flames are held at burner ports 13 of the vaporized kerosene outlet 12 in the beginning. When a draft is generated by combustion at the burner ports 13, the holding flame spreads from the burner ports 13 to vent-burner ports 61 on the circumferential face of the inner column 31 and then to vent-burner ports 62 on the inner circumferential face of an outer column 32, and combustion continuous. The flame holding at the local area A on the inner column 31, located nearby the detecting element 21 of the thermistor 20, is more stable than the other area, where the vent burner ports 61 and 62 are provided, because a larger number of the vent-burner ports 61 are provided in the local area A. Therefore, the detecting element 21 of the thermistor 20 is surely heated, allowing the thermistor 20 to clearly detect the state of the flame.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention provides a type of combustion device in which the wick is removed from an upper-and-lower wick type oil heating device, and the oil tank in which the wick was immersed is replaced with a vaporizing cylinder. Regarding.

<Conventional technology> Conventionally, in wick type combustors such as wick type stoves, combustion air is dividedly supplied through natural ventilation to create a reduction combustion zone.
Although it is possible to suppress the generation of NOx to a much lower level than in a normal Bunsen type combustor, there is a problem in that a lot of odor is generated during ignition and extinguishing.

On the other hand, in a vaporizing type combustor such as the combustion device proposed in JP-A No. 62-255708, in which combustion air is forcibly supplied by a fan, etc., there is relatively little odor during ignition and extinguishing; There was a problem in which a large number of occurrences of , NO, occurred.

Therefore, in Japanese Patent Application No. 1-307995, the present applicant has proposed a naturally aspirated combustor that successfully combines the advantages of the two types of combustors and is a vaporization type combustor that does not use a wick.

<Problems to be Solved by the Invention> However, in the above-mentioned naturally aspirated and vaporizing type combustor, when a thermistor is used to detect flame in the combustion chamber, the temperature rise is small, so the sensitivity of flame detection by the thermistor is low. Unfortunately, there was a drawback that flame detection became unstable.

SUMMARY OF THE INVENTION Therefore, the present invention aims to provide a naturally aspirated and evaporative combustion apparatus in which flame detection using a thermistor can be performed stably and with high reliability.

Means for Solving the Problems> In order to achieve the above object, the combustion apparatus of the present invention includes a vaporization tube that receives petroleum fuel and vaporizes it, and an annular petroleum vaporized gas outlet provided on the ceiling of the vaporization tube. , a combustion cylinder consisting of an inner cylinder and an outer cylinder, between which a combustion chamber is formed to combust the gas flowing out from the petroleum vaporized gas outflow part; It has at least a large number of dispersed ventilation flame holes,
A combustion device in which a flame in a combustion chamber is detected by a thermistor, wherein the number of ventilation flame holes in the inner cylinder part or the outer cylinder part located near the detection part of the thermistor is larger than in other parts. It is characterized by

<Function> The density of the ventilation flame holes in the inner cylinder and the outer cylinder of the combustion cylinder near the thermistor detection area is higher in the vicinity of the detection area. This increases the amount of air introduced into the combustion chamber. Therefore, flame formation in that area becomes easier and more stable, and the temperature of the flame also increases. Therefore, the thermistor detection part is stably heated to a higher temperature,
The presence or absence of flame detection becomes more reliable.

<Example> FIG. 1 is an overall configuration diagram of an apparatus for implementing the present invention, and FIG. 2 is a perspective view of an inner cylinder. This embodiment is configured as a radiant heater.

The vaporizing cylinder 10 has a donut shape with a ventilation opening 14 passing through the center, and a sheathed heater 11 is arranged inside. The heater 11 may be embedded in the wall of the vaporizer cylinder 10. An annular petroleum vaporized gas outlet 12 is provided on the ceiling of the vaporizer cylinder IO, and a plurality of flame holes 13 are formed in the outlet 12. The vaporized gas flows upward from the flame hole 13.

A combustion tube 30 is provided to rest on the vaporization tube 10. The combustion tube 30 consists of an inner tube 31 and an outer tube 32, and a combustion chamber 33 is formed between the inner tube 31 and the outer tube 32. The petroleum vaporized gas outlet portion 12 faces this combustion chamber 33 , and the petroleum vaporized gas flows into the combustion chamber 33 from the flame hole 13 . A glass cylinder 40 is further provided on the outside of the combustion cylinder 30 so as to surround it. The space between the outer cylinder 32 and the glass cylinder 40 and the inside of the inner cylinder 31 are defined as ventilation chambers 51 and 52, respectively. The ventilation opening 14 of the vaporization cylinder 10 communicates with the ventilation chamber 52 inside the inner cylinder 31 .

Further, a ventilation opening 15 is formed at the lower end of the ventilation chamber 52 on the outside of the outer cylinder 32. These two ventilation openings 1
Outside air enters the ventilation chamber 51.52 through 4.15.

Further, a large number of ventilation flame holes 61, 62 are distributed and provided in the inner cylinder 31 and the outer cylinder 132.

Reference numeral 20 denotes a flame detection thermistor, and a detection part 21 at the tip thereof is heated by the flame, thereby detecting the flame. If the detection unit 21 is insufficiently heated, it is difficult to determine whether there is a flame or not. Therefore, when there is flame in the combustion chamber 33, the detection part 21 needs to be heated to a sufficiently high temperature. To address this need, in this embodiment, as shown in FIG. 2, more ventilation flame holes 61 are provided in a portion A of the inner cylinder 31 near the sensing portion 21 of the thermistor 20 than in other portions. Note that when the outer cylinder 32 is closer to the detection part 21, more ventilation flame holes 62 are provided in the part of the outer cylinder 32 closer to the detection part 21 than in other parts.

An electromagnetic pump 80 is connected from the oil tank 70 to the vaporization cylinder 10.
Oil is supplied by

When the operation starts now, the sheathed heater 11 is first energized. The oil sent to the vaporization cylinder 10 by the electromagnetic pump 80 is vaporized by the preheated sheathed heater 11, and flows upward from the oil vaporized gas outlet 12 on the ceiling. By igniting the flame with an igniter (not shown), the flame is initially held in the flame hole 13 of the vaporized gas outlet 12. When the draft shown by the arrow in FIG. 1 is generated due to combustion in the flame hole 13, flame holding in the flame hole 13 is achieved through the ventilation flame hole 61 on the outer periphery of the inner cylinder 31 and the ventilation flame hole 62 on the inner periphery of the outer cylinder 32. The combustion continues.

Flame holding at the ventilation flame holes 61 and 62 is achieved because a large number of ventilation flame holes 61 are formed in the part A of the inner cylinder 31 near the detection part 21 of the thermistor 20, so that the flame in the part A does not spread to other parts. It is more stable and a high-temperature flame is effectively formed by ventilation. Therefore, if combustion is actually taking place, the above part A
The detection portion 21 of the thermistor 20 is reliably heated by the high-temperature and stable flame generated, and flame detection is performed in a clear state.

<Effects> The present invention has the above configuration, and according to the combustion apparatus according to claim 1, the number of vent flame holes in the inner cylinder part or the outer cylinder part located near the detection part of the thermistor is lower than that in other parts. Since the number of flames is increased, when combustion is occurring, the thermistor detection part is reliably and sufficiently heated by a high temperature and stable flame, and flame detection can be performed with sufficient reliability.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram of an apparatus for implementing the present invention, and FIG. 2 is a perspective view of an inner cylinder. 10: Vaporizer cylinder 12; 20: 21: 30: 31: 32: 33: 61, Petroleum vaporized gas outlet thermistor detection part Combustion cylinder inner cylinder outer cylinder Combustion chamber 61: Ventilation flame hole

Claims (1)

[Claims] (1) a vaporizer that receives and vaporizes petroleum fuel; an annular petroleum vaporized gas outlet provided on the ceiling of the vaporizer;
A combustion cylinder consisting of an inner cylinder and an outer cylinder and forming a combustion chamber therebetween for burning the gas flowing out from the petroleum vaporized gas outflow part, and a plurality of combustion cylinders in the inner cylinder and the outer cylinder for inviting combustion air into the combustion chamber. A combustion device having at least ventilating flame holes provided in a dispersed manner and detecting flame in a combustion chamber by a thermistor, the inner cylinder part or the outer cylinder part located near the detection part of the thermistor. A combustion device characterized by having more ventilation holes than other parts.