JPS5913461Y2 - Evaporative combustion device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a vaporization type combustion device that vaporizes and burns liquid fuel.

To explain a conventional combustion device of this type, as shown in Fig. 1, liquid fuel in an oil tank a is sequentially introduced into a vaporizer C via an electromagnetic pump b, and is vaporized by a heater d. The vaporized gas is ejected from the nozzle e into the mixing pipe g of the burner f, and the vaporized gas is mixed with the primary air for combustion that is sucked in with the ejection, and is guided through the mixing pipe g to the gas blowing part. It is designed to blow and burn.

However, the path for the vaporized gas to reach the gas outlet is long, and therefore, especially at the beginning of combustion, that is, when the temperature of the burner f is low, some of the vaporized gas condenses in the mixing pipe g and becomes a drain. , as a result, not only does the combustion efficiency decrease, but also the mixing pipe g
In addition, since the vaporizer C and the gas blowing part are separated by a large distance, the entire device becomes large, making it difficult to incorporate it into heating equipment, etc. Moreover, in order to vaporize the fuel, the heater d must be energized at all times, resulting in poor economic efficiency.

This idea was developed with these points in mind, and its purpose is to reliably prevent the inadvertent condensation of vaporized gas, to make the overall structure compact, and to be economical. An object of the present invention is to provide a vaporization type combustion device that can achieve efficient combustion operation.

This invention will be explained below based on an embodiment shown in FIGS. 2 to 4.

In the figure, reference numeral 1 denotes a flat, rectangular carburetor that is integrally molded, for example, by aluminum die-casting, and in this carburetor 1, a sheathed heater 2 and a vaporization pipe 3 are buried in parallel along the longitudinal direction on the -side side. , and a nozzle mechanism 4 is incorporated in the corner of the other side.

The nozzle mechanism 4 includes a bulging protrusion 1 integrally formed with the vaporizer 1.
A cylindrical holder 5 is fitted into the holder 5, a needle valve 6 is slidably housed in the holder 5, a nozzle 7 is attached to the tip of the holder 5, and the nozzle 7 is attached to the circumferential surface of the bulging protrusion 1a. It becomes exposed to.

The needle valve 6 can be slidably operated from the outside via an interlocking mechanism 8, and the ejection hole 7a of the nozzle 7 can be opened and closed by this operation.

One end of the vaporizing pipe 3 leads out from the end face of the carburetor 1, and an oil supply pipe 9 communicating with an oil tank (not shown) is removably connected to the leading end via a connector 10.

A cylindrical filter 11 is removably inserted into the vaporization pipe 3, and an electromagnetic pump (not shown) is provided in the middle of the fuel supply pipe 9, and this pump pumps liquid fuel such as kerosene in the oil tank. It is designed to be sequentially supplied into the vaporizing pipe 3.

The other end of the vaporization pipe 3 is connected to a nozzle mechanism 4 via a communication pipe 12.
It communicates with the inside of the holder 5.

On the side of the carburetor 1, there is a burner 13, which is configured into a flat shape by bonding and fixing a pair of symmetrical press-formed doors to each other.
Attached via 31.13 a.

This burner 13 includes a cylindrical mixing tube 14 and a cylindrical mixing tube 14.
A wide diffusion part 15 is bent at right angles from one end and extends to widen at the end, and a large number of slit-shaped flame holes 16 are bored in the end face of this diffusion part 15. It consists of a gas blow-off section 17 that is configured as follows.

The opening end surface of the mixing tube 14 faces the nozzle 7, and the gas blowing part 17 is arranged along the longitudinal direction of the upper edge of the vaporizer 1.

A pair of flat convex portions 18 and 19 are formed on the side surface of the vaporizer 1, one convex portion 18 is located at the junction between the mixing tube 14 and the diffusion section 15, and the other convex portion 19 is located at the junction between the mixing tube 14 and the diffusion section 15. It is in close contact with the open end surface side of the tube 14.

That is, the burner 13 is supported via the convex portions 18, 19, and only contacts the carburetor 1 at the support portion thereof, and the other portion is separated from the side surface of the carburetor 1 by a small gap 20.

Further, the upper edge of the vaporizer 1 extends above the gas blowing part 17 of the burner 13, and a heat receiving protrusion 21 facing directly above the gas blowing part 17 is integrally formed on the extending edge.

Note that 22 is a thermostat that controls the heater 2 according to the temperature of the vaporizer 1.

Next, the effect will be explained.

First, prior to the start of combustion, the heater 2 is energized, and the vaporizer 1 and the vaporizing pipe 3 are preheated by the heat generated by the heater 2.

And that temperature is the fuel vaporization temperature (250-280℃)
When this temperature is reached, it is detected by a temperature sensor, and liquid fuel is sequentially supplied from the fuel supply pipe 9 into the vaporization pipe 3 via an electromagnetic pump.

Since the vaporization pipe 3 has already reached the vaporization temperature of the fuel, while the fuel flows through the pipe 3, it is sequentially vaporized and becomes vaporized gas.

This vaporized gas then reaches the inside of the holder 5 through the communication pipe 12, and the ejection hole 7 of the nozzle 7 which has been opened in advance.
a into the mixing tube 14 of the burner 13.

At this time, since the holder 5 is buried integrally within the protrusion 1a of the vaporizer 1 and sufficiently absorbs the heat of the vaporizer 1,
To eject vaporized gas in a complete gas state without inadvertently condensing it.

Due to the jet effect accompanying this ejection, primary air for combustion is sucked into the mixing tube 14 together with the vaporized gas, and both of them are mixed while flowing in the mixing tube 14 to form a mixed gas, and this mixed gas is mixed into the diffusion section 15. The flame spreads, ejects from each flame hole 16, ignites and burns.

Since the burner 13 is installed in parallel with the vaporizer 1, its temperature increases due to conduction and radiation heat from the vaporizer 1, that is, it is preheated, and therefore the temperature is increased by the heat being supplied to the burner 13. The vaporized gas not only does not condense inadvertently, but also maintains a sufficient temperature.
. . . Therefore, the ignition is performed extremely well, and after ignition, efficient complete combustion occurs immediately, and start-up performance is greatly improved.

By the way, if the temperature of the arrangement part of each flame hole 16, that is, the gas blowing part 17 is higher than necessary, the combustion flame will be pushed inward of the flame hole 16. There is a risk that a flashback phenomenon may occur where combustion continues in some parts.
It is desirable to suppress the temperature to about 120-150°C, which is lower than 250-280°C.

In other words, although it is preferable to maintain the burner 13 at a high temperature in order to prevent condensation of vaporized gas, it is necessary to suppress the temperature of the gas outlet part in order to prevent flashback.

Therefore, looking at this embodiment, the burner 13 has a convex portion 18
．． 19, and there is a gap 20 in other parts, so the area near the contact part is heated to a high temperature almost equivalent to that of the vaporizer 1. ,
The gas blowing portion 17 is maintained at a lower temperature of about 120 to 150° C., so that flashback phenomenon is reliably prevented.

On the other hand, the vaporized gas ejected from the nozzle 7 flows through the mixing tube 14, collides with the peripheral wall a on the tip side thereof, and diffuses into the diffusion section 15.

Therefore, it can be said that the vaporized gas is most likely to condense when it comes into contact with the clearing a.

However, the convex portion 18 is in close contact with the portion of the peripheral wall a,
Therefore, the area around the peripheral wall a is always maintained at a high temperature, thereby reliably preventing condensation of vaporized gas.

On the other hand, above the gas blow-off part 17, secondary air is obtained from the surrounding area and combustion continues.

The upper edge of the vaporizer 1 extends to the side of the gas blowing part 17, and a heat receiving protrusion 21 is integrally formed on the extending edge so as to face directly above the gas blowing part 17. The radiant heat from combustion is well transferred to the vaporizer 1, and therefore, after the combustion has elapsed for a certain period of time, the vaporizer 1 is maintained at a predetermined temperature not by the heater 2 but only by the heat of the combustion itself.

Therefore, at this point, the power supply to the heater 2 can be cut off, and the fuel can be vaporized by the heat generated by its own combustion, thereby greatly improving economic efficiency.

Looking at the overall configuration, since it is made up of a flat carburetor 1 and a flat burner 13 arranged side by side, the entire structure is thin and compact, which is extremely advantageous for incorporation into heating equipment and the like.

Since the burner 13 is simply added to the vaporizer 1, there is an advantage of flexibility in that it can be easily removed and replaced with another burner with a different calorie consumption.

Further, since the vaporizing pipe 3 is arranged in a straight line, it is easy to insert and remove the filter 11 accommodated therein, which is advantageous for assembly and replacement work.

In the above embodiment, the burner is provided only on one side of the carburetor 1, but the burner may be provided on both sides of the carburetor 1.

As explained above, according to this invention, a heater, a vaporizing pipe, and a nozzle mechanism communicating with the pipe are buried in a flat metal vaporizer with the nozzle exposed to the outside, and the vaporizer is Since a flat burner that guides and burns the vaporized gas ejected from the nozzle is installed in parallel on at least one side, the burner can be appropriately preheated to reliably prevent condensation of the vaporized gas. Therefore, not only is the structure simplified since a drain recovery means is not required, but the ignition is always good and the combustion quickly and efficiently shifts to complete combustion, which greatly improves start-up performance.

After a certain period of time has elapsed, the heat from the combustion can heat the vaporizer and self-vaporize the fuel, making it possible to omit energizing the heater from then on and achieve economical combustion operation. .

Moreover, since the structure is made up of flat burners arranged side by side on the side of a flat carburetor, the whole is thin and compact, which has the advantage of being extremely advantageous for integration into heating equipment and the like.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of a conventional device, FIG. 2 is a partially cutaway front view showing an embodiment of the invention, FIG. 3 is a plan view, and FIG. 4 is a side view. 1... Carburizer, 2... Heater, 3...
... Vaporization pipe, 4 ... Nozzle mechanism, 13
...Burna.

Claims (1)

[Scope of utility model registration request] A flat metal vaporizer in which a heater, a vaporization pipe, and a nozzle mechanism communicating with the pipe are buried, and the ejection hole of the nozzle mechanism is exposed to the outside; A vaporization combustion device consisting of a flat burner that guides and burns vaporized gas ejected from a hole.