JP2852993B2 - Liquid fuel combustion device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid fuel combustion apparatus for vaporizing and burning liquid fuel.

[0002]

2. Description of the Related Art An oil fan heater will be described as an example of a conventional liquid fuel combustion apparatus with reference to the drawings. FIG. 6 is a partially cutaway front view illustrating the configuration of an oil fan heater, and FIG.
FIG. 8 is a front view of the silicon nitride heater, and FIG. 8A is a front view, FIG. 8B is a plan view, and FIG. 8C is a bottom view. 9 is a drawing of the vaporizing element, wherein FIG. 9A is a plan view and FIG. 9B is a front view.

The oil fan heater includes a fuel tank 1, an electromagnetic pump 2, an oil feed pipe 3, a carburetor 4, a nozzle 5, a burner 6, an ignition device 7, a flame detection device 8, a thermistor 9, a solenoid valve 10, a needle 11, A return pipe 12 and a cartridge tank 13 are included.

[0004] Kerosene 14 in the fuel tank 1 is fed into the vaporization chamber from the inlet 4A of the vaporizer 4 via the oil supply pipe 3 by the electromagnetic pump 2. In the vaporizing chamber, the vaporizing element 24 is heated and held at a high temperature of 250 to 400 ° C. by the vaporizer heater 20. By passing the kerosene 14 through the vaporizing element 24, it is vaporized, ejected from the nozzle 5, mixed with air, supplied to the burner 6, ignited by the ignition device 7, and burned by the flame detection device 8. After that, start burning.

The temperature of the vaporizer 4 is detected by a thermistor 9 and a vaporizer heater 20 is controlled via a microcomputer (not shown). Further, the nozzle 5 provided at the tip of the vaporizer 4 is controlled to be opened and closed by moving the needle 11 up and down by the electromagnetic valve 10. When the nozzle 5 is closed, the kerosene 14 in the vaporizer chamber is returned to the fuel tank 1 via the return pipe 12. Note that kerosene 14 is supplied from the cartridge tank 13 into the fuel tank 1 so as to have a constant liquid level.

The heater 20 for the vaporizer includes a single heater (not shown) such as a sheathed heater or a ceramic heater, a silicon nitride heater assembly 21 and a vaporizer 24. As shown in FIG. 8, reference numeral 21 denotes a rod-shaped silicon nitride heater (hereinafter, referred to as a "vaporization heater 22") having a rectangular cross section and a metallized surface, and a silver brazing at a predetermined position of the vaporization heater 22. And a heater fitting 23 provided.

On the other hand, as shown in FIG. 9, the vaporizing element 24 is formed of a highly heat-resistant ceramic, sintered metal such as SUS, etc. in a substantially cylindrical shape, and the vaporizing heater 22 can be inserted at the center. Square hole 24A is opened.

Then, the vaporizing element 24 is inserted into the vaporizer 4, and the silicon nitride heater assembly 21 is inserted into the square hole 24A.
The heater bracket 23 is attached to the wall of the vaporizer 4 by silver brazing, and the vaporizer heater 22 is fixed.

[0009]

However, in the prior art, the pre-heating time of the vaporizer was as long as 20 seconds to 3 minutes. In addition, since the heater is directly attached to the vaporizer with silver brazing, there are the following difficulties.

In other words, when a metal fitting is attached to the vaporizing heater by silver brazing, since the metallized vaporizing heater has a small heat capacity, the heating time for the silver brazing can be shortened. There is no disconnection. On the other hand, when the heater metal is attached to the vaporizer by silver brazing, the heat capacity of the vaporizer frame is large, so that the required time is long, and the vaporizer may be disconnected due to high temperature.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a liquid fuel combustion apparatus which shortens the preheating time of a vaporizer and prevents the vaporization heater from breaking during assembly of the vaporizer. The purpose is.

[0012]

According to a first aspect of the present invention, there is provided a liquid fuel combustion apparatus, wherein the liquid fuel is vaporized by a carburetor, ejected from a nozzle, and burned by a burner . Vaporization element inserted inside the vaporizer
Into the eccentric hole penetrating through the vaporizing element.
And a silicon nitride layer provided in the partition tube.
And

A liquid fuel combustion apparatus according to a second aspect of the present invention is a liquid fuel combustion apparatus in which liquid fuel is vaporized by a carburetor, ejected from a nozzle, and burned by a burner. The carburetor is provided on a side surface of the carburetor. A normal combustion vaporizing heater, a vaporizing element having an eccentric hole eccentrically inserted through the vaporizer, a partition tube inserted into the eccentric hole, and a silicon nitride heater provided in the partition tube. Have.

According to a third aspect of the present invention, the vaporizing element is inserted into the vaporizer such that the eccentric hole is located near the nozzle.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a liquid fuel combustion apparatus according to the present invention will be described below with reference to the drawings. 1 is a front view of the vaporizer, FIG. 2 is a side view of the vaporizer, and FIG.
3A is a cross-sectional view taken along line AA, FIG. 3B is an enlarged view of a main part of FIG. 3A, and FIG. 4 is an enlarged cross-sectional view taken along line BB of FIG. It is to be noted that parts and the like that are substantially the same as those of the related art are denoted by the same reference numerals and described.

The oil fan heater according to the present embodiment includes a fuel tank 1, an electromagnetic pump 2, an oil feed pipe 3, a carburetor 30,
Nozzle 5, burner 6, ignition device 7, flame detection device 8, thermistor 9, solenoid valve 10, needle 11, return pipe 1
2. Includes a cartridge tank 13.

The vaporizer 30 includes a silicon nitride heater assembly 2
1, a vaporizing element 31, a partition tube 32, and a main body cap 3
It consists of three.

As in the prior art, the silicon nitride heater assembly 21 has a heater bracket 23 attached to a predetermined position of a vaporizing heater 22 having a metallized surface by silver brazing. Vaporizing element 3
Numeral 1 is formed in a substantially cylindrical shape from ceramics or the like, and has an eccentric hole 31A extending in the axial direction offset from the axis.

The partition tube 32 is made of ceramics or the like, is a hollow cylindrical member having one end opened and has an outer diameter that can be inserted into the eccentric hole 31A. The opening end is expanded with a step 32 </ b> A, and the inner surface is fitted into the heater fitting 23, and the outer surface is fitted into the main body cap 33.

The main body cap 33 is a plate-like body for fixing the silicon nitride heater assembly 21 to the vaporizer 30 together with the partition tube 32, and has an eccentric hole 33A which is eccentric from the axis.
The eccentric hole 33A is formed so as to fit into the opening end of the partition tube 32 having the step 32A, and to fit into the frame of the vaporizer 30 on the outer surface.

Next, the procedure for assembling the vaporizer 30 will be described. After inserting the vaporizing element 31 into the vaporizer 30, the main body cap 33 is press-fitted, and the eccentric hole 31 of the vaporizing element 31
The partition wall tube 32 is inserted into the eccentric hole 31A so that A faces the nozzle 5 (see FIG. 1). The partition tube 32 is fixed to the vaporizer 30 by the main body cap 33, and the vaporizing element 31
And the partition tube 32, the vaporizer 30 having a double structure is assembled.

The vaporizer frame, the main body cap 33 and the partition tube 32 are simultaneously soldered to silver.

The silicon nitride heater assembly 21 is inserted into the partition tube 32. The heater fitting 23 is fitted into the partition tube 32 and the carburetor frame, and the silicon nitride heater assembly 21 is fixed thereto.

Next, the operation of the liquid fuel combustion apparatus according to the first aspect will be described. When the operation switch (not shown) is turned on,
The solenoid valve 10 and the vaporizing heater 22 are energized, and the nozzle 5 is closed by the needle 11 and the vaporizing heater 22 becomes red at the same time.

The temperature of the vaporization heater 22 is very fast, for example, so that the energization time reaches 1000 ° C. in 10 seconds.
It will be 0 ° C. The temperature near the nozzle 5 also becomes 150 to 200 ° C. in about 10 seconds. The kerosene 14 sent from the electromagnetic pump 2 is quickly vaporized, and is
Spout toward.

In the liquid fuel combustion apparatus according to the first aspect, since the vaporization heater 22 is not directly brazed to the frame of the vaporizer 30 having a large heat capacity unlike the prior art, vaporization is caused by the high temperature at the time of silver brazing. The heater 22 is not disconnected.

Further, since the vaporizing element 31 is inserted into the vaporizer 30 so that the eccentric hole 31A is located near the nozzle, the vaporizing heater 22 becomes closer to the nozzle 5 and the nozzle 5
Since the temperature rise is faster than that of a conventional vaporizer, there is an advantage that the ignition time is shortened and the liquid level does not drop.

Next, an embodiment of a liquid fuel combustion apparatus according to claim 2 will be described with reference to the drawings. FIG. 5A is a front view of a main part of the vaporizer, and FIG. 5B is a cross-sectional view taken along line CC of FIG. 5A.

The vaporizer 4 of the oil fan heater according to the present invention
Numeral 0 designates a vaporization heater 41 for normal combustion, such as an alumina heater, provided on a side surface of the vaporizer 30 described above, and other structures are the same as those of the vaporizer 30 described above.

Since the temperature of the vaporizing heater 22 rises quickly and the heat capacity is small, it is difficult to control the vaporizing heater 22. Therefore, the vaporization heater 22 is used only at the initial stage of preheating, and after a certain time of ignition, the energization is switched to the normal combustion vaporization heater 41, and the normal combustion vaporization heater is controlled by the thermistor 9 according to the amount of combustion to continue combustion. Like that. Thereby, the temperature control of the heater is facilitated. In addition,
The operation of the petroleum fan heater according to the present invention is similar to that described above, and thus the description thereof is omitted.

[0031]

As described above, the liquid according to claim 1
The body fuel combustion device uses a vaporizer to vaporize liquid fuel
Liquid fuel combustion device that makes it more squirt and burns with burner
Wherein the vaporizer is a vaporizer inserted inside the vaporizer.
Element and an eccentric hole that is eccentrically inserted through the vaporizing element.
And the silicon nitride provided in the partition tube
And a heater. For this reason, the vaporization heater
The silicon nitride heater is, for example, 1000 ° C. for 10 seconds
The temperature rises very quickly to reach the surrounding bulkhead tube,
The vaporizing element instantaneously reaches about 400-500 ° C. Also,
The temperature in the vicinity of the spill will be 150-200 ° C in about 10 seconds.
You. Therefore, kerosene sent from the electromagnetic pump
And gushes from the nozzle toward the burner. Follow
Thus, the preheating time can be significantly reduced.

In the liquid fuel combustion apparatus according to the second aspect, a normal combustion vaporization heater such as an alumina heater is provided on a side surface of the vaporizer. Further, the eccentric hole of the vaporizing element is located near the nozzle. Therefore, the preheat time of the vaporizer is about 10 seconds, and rapid ignition becomes possible. Further, since the silicon nitride heater is directly soldered to the vaporizer with silver, there is no disconnection of the heater due to high temperature, and the product is stable. Further, even when the vaporizer is clogged, the vaporizer becomes hot, and can be heated to a temperature higher than the conventional cleaning temperature of about 450 ° C., so that there are many excellent effects that the cleaning effect is large. .

[Brief description of the drawings]

FIG. 1 is a front view of a carburetor used in a liquid fuel combustion device according to claim 1.

FIG. 2 is a side view of a carburetor used in the liquid fuel combustion device according to the first embodiment.

3A is a cross-sectional view taken along line AA of FIG. 1, and FIG.
It is a principal part enlarged view of (A).

FIG. 4 is an enlarged cross-sectional view taken along line BB of FIG. 2;

5 is a drawing of a carburetor used in the liquid fuel combustion apparatus according to claim 2, wherein FIG. 5A is a front view of a main part of the carburetor, and FIG. 5B is a drawing of FIG. It is CC sectional drawing.

FIG. 6 is a drawing according to the prior art, and is a partially cutaway front view illustrating the configuration of an oil fan heater.

FIG. 7 is a front view of a partially cut-away main part of FIG. 6;

8A and 8B are drawings of a silicon nitride heater, wherein FIG. 8A is a front view, FIG. 8B is a plan view, and FIG. 8C is a bottom view.

9A and 9B are drawings of the vaporizing element, wherein FIG. 9A is a plan view and FIG. 9B is a front view.

[Explanation of symbols]

 2 Electromagnetic pump 5 Nozzle 6 Burner 9 Thermistor 10 Solenoid valve 20 Vaporizer heater 21 Silicon nitride heater assembly 22 Silicon nitride heater (vaporization heater) 23 Heater fitting 30 Vaporizer 31 Vaporization element 31A Eccentric hole 32 Partition tube 33 Main body cap 40 Vaporization Vessel 41 Evaporator for normal combustion

Claims (3)

(57) [Claims] 1. A liquid fuel combustion apparatus in which liquid fuel is vaporized by a vaporizer, ejected from a nozzle, and burned by a burner, wherein the vaporizer is a vaporizing element inserted inside the vaporizer.
Into the eccentric hole penetrating through the vaporizing element.
And a silicon nitride layer provided in the partition tube.
A liquid fuel combustion device comprising : 2. In a liquid fuel combustion apparatus in which liquid fuel is vaporized by a vaporizer, ejected from a nozzle, and burned by a burner, the vaporizer includes a normal combustion vaporization heater provided on a side of the vaporizer, and an inside of the vaporizer. A liquid fuel combustion device comprising: a vaporizing element having an eccentric hole eccentrically penetrated therethrough, a partition tube inserted into the eccentric hole, and a silicon nitride heater provided in the partition tube. . 3. The liquid fuel combustion apparatus according to claim 1, wherein the vaporizing element is inserted into the vaporizer such that the eccentric hole is located near the nozzle.