JP3316242B2 - 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 used for an oil combustion machine such as an FF type oil hot air heater, an oil fan heater, and an oil water heater.

[0002]

2. Description of the Related Art Conventionally, in this type of liquid fuel combustion apparatus, an air nozzle is attached to a peripheral wall of a vaporizing cylinder for vaporizing liquid fuel, and a fuel nozzle for supplying liquid fuel is arranged coaxially with the air nozzle. The base of the fuel nozzle is supported by a blower tube connected to the air nozzle, and the supporting member for supporting the tip of the fuel nozzle is provided on the air nozzle, so that the position of the tip of the fuel nozzle is always the position of the air nozzle. Japanese Patent Application Laid-Open No. Sho 60-14701 discloses a method in which the flame is made uniform and the vaporization efficiency is improved so as to be on the central axis.
It is known from Japanese Patent Publication No.

[0003]

However, in the above-described conventional liquid fuel combustion apparatus, since the support member for supporting the front end side of the fuel nozzle is located at the back of the air nozzle, the fuel nozzle is inserted into the nozzle insertion hole of the support member. Is troublesome, and the assembling workability is poor.

[0004] Further, since the above-mentioned blower cylinder has a bent portion bent at a substantially right angle because the fuel nozzle is arranged concentrically, the flow of combustion air is disturbed at the bent portion, Not only can air supply not be performed smoothly, but also due to turbulence in the combustion air flow, a part of the discharged fuel adheres to the outer lower surface of the tip of the fuel nozzle, causing uneven fuel supply and causing breathing combustion. I was worried about it.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and it has been made possible to improve the workability of assembling while improving the uniformity of the flame and the vaporization efficiency, and to suppress the occurrence of breathing combustion. It is intended to be.

[0006]

According to the present invention, there is provided a vaporizing cylinder for vaporizing a liquid fuel, an air nozzle provided on a peripheral wall of the vaporizing cylinder, and a fuel nozzle having a front end opening facing the inside of the vaporizing cylinder through the air nozzle. And a blower tube supporting the base of the fuel nozzle and having a distal end connected to the air nozzle and guiding combustion air from the combustion blower to the air nozzle, and connecting the air nozzle to the blower cylinder. A nozzle support for supporting an intermediate portion between the base of the fuel nozzle and the distal end opening is disposed in the portion, and the nozzle support is provided with a nozzle for inserting the fuel nozzle.
Bottom with multiple ventilation openings located around the chisel insertion hole
A wall portion, and a cylindrical peripheral wall portion fitted inside the air nozzle
And a fixing flange portion.
Combustion air flow is rectified around the periphery of the ventilation opening in the bottom wall
Rising edge for airflow direction
A configuration that is.

[0007]

As described above, the intermediate portion of the fuel nozzle whose base is supported by the blower cylinder is supported by the nozzle support, and the position of the tip of the fuel nozzle is located on the center axis of the air nozzle.
The nozzle support is located at the connection between the air nozzle and the blower cylinder, so that the fuel nozzle can be easily inserted into and supported by the nozzle support as well as improving the uniformity of the flame and improving the vaporization efficiency. The assembly workability can be improved. The nozzle support has a plurality of nozzles provided on the bottom wall thereof.
Around the ventilation opening as a rectification mechanism for combustion air
Since the rising edge is formed in the flow direction of the air flow, the turbulence of the combustion air flow generated at the bent portion of the blower cylinder is rectified at the rising edge of the nozzle support. Since it is guided to the air nozzle, combustion air can be sent into the carburetor in a stable flow state from around the fuel nozzle, and the combustion air and fuel are smoothly supplied into the carburetor and the combustion state is stabilized. .

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In the figure, reference numeral 1 denotes a bottomed cylindrical vaporizing cylinder having an open top, 2 denotes an electric heater such as a sheath heater embedded in the upper part of the vaporizing cylinder 1, 3 denotes a diaphragm plate disposed in the upper part of the vaporizing cylinder 1, and 4 denotes The burner head is fitted and mounted on the upper end opening of the vaporizing cylinder 1 on the aperture plate 3. The bottom wall of the burner head 4 is provided with a large number of through holes 5, 5 and the peripheral wall is provided with a large number of through holes. Are provided. Reference numeral 7 denotes a burner ring arranged on the outer periphery of the burner head 4. The burner ring 7 has a horizontal portion fixed to the upper end of the vaporizing cylinder 1.

An air nozzle 8 is provided on the peripheral wall of the vaporizing cylinder 1.
The air nozzle 8 has an outer end connected to a distal end 10A of a blower cylinder 10 which is connected to a combustion blower 9 and bent in a substantially L-shape. Is a tip opening 11 through the axis of the air nozzle portion 8.
Base 11 of fuel nozzle 11 with A facing inside vaporization cylinder 1
B is fixedly supported.

The fuel nozzle 11 is connected to a fuel tank 1 via a fuel supply pipe 12 and a fuel pump 13 such as an electromagnetic pump.
The liquid fuel in the fuel tank 14, which is connected to the fuel tank 4 and pumped by the driving of the fuel pump 13, passes through the fuel supply pipe 12 and the fuel nozzle 11, and from the tip opening 11 </ b> A of the fuel nozzle 11 to the inside of the vaporization cylinder 1. Squirted. Reference numeral 15 denotes a bottomed cylindrical burner case provided on the outer periphery of the vaporizing cylinder 1 and housing and fixing the vaporizing cylinder 1 inside, and 16 denotes a space between the vaporizing cylinder 1 and the burner case 15 from the combustion blower 9. A secondary air pipe for sending secondary air for combustion.

Reference numeral 17 denotes a cylindrical support having a bottom which is disposed at a connection portion between the air nozzle portion 8 and the blower cylinder 10 and supports a suitable place in the middle of the fuel nozzle 11 near the tip opening 11A. The nozzle support 17 has a small-diameter nozzle insertion hole 18 at the center thereof for inserting the fuel nozzle 11, and a plurality of fan-shaped ventilation openings 19, 19 arranged on the outer periphery of the nozzle insertion hole 18. 17A, a cylindrical peripheral wall portion 17B fitted inside the outer end portion of the air nozzle portion 8, and an air nozzle connected to the end portion of the peripheral wall portion 17B via the burner case 15 and the packing 20. It has a portion 8 and a flange portion 17C sandwiched between fixed flanges 10B of the blower tube 10.

Further, each ventilation opening 1 of the nozzle support 17 is provided.
Rising edges 21, 21 for rectifying the combustion air flow guided to the air nozzle portion 8 are formed on the peripheral edges of 9 and 19 in the flow direction of the combustion air. 22 is a spark plug and 23 is a frame rod.

In the above-described configuration, when the temperature of the vaporizing cylinder 1 rises above the vaporizable temperature of the liquid fuel by energizing the electric heater 2, the blower 9 and the fuel pump 13 operate, and the liquid fuel from the fuel nozzle 11 and The blower tube 11, the ventilation openings 19, 19 of the nozzle support 17, and the air nozzle portion 8
Is supplied to the inside of the vaporization cylinder 1. Here, the liquid fuel supplied to the inside of the vaporization cylinder 1 contacts the vaporization surface and is vaporized, and the mixture of the vaporized gas and the primary air for combustion passes through the passage and the through holes 5 and 5 of the throttle plate 3. It passes through the burner head 4 and blows out from each of the flame holes 6. The jetted air-fuel mixture is ignited by spark discharge generated from the spark plug 22, and starts to burn.

On the other hand, the secondary air for combustion supplied into the burner case 15 through the secondary air pipe 16 rises in the annular space between the peripheral wall of the burner case 15 and the vaporizing cylinder 1 and burner rings. 7 flows near the periphery and is supplied to the flame to promote secondary combustion.

After that, the heat of the flame is recovered by the vaporization cylinder 1,
When the temperature of the vaporizing section of the vaporizing cylinder 1 is maintained at a temperature at which fuel can be vaporized by the recovered heat, the electric heater 2
Is stopped, but combustion continues.

According to the present embodiment, the nozzle support 17 is arranged at the connection between the air nozzle unit 8 and the blower cylinder 10 which are integrally formed on the peripheral wall of the vaporizer cylinder 1, and the base 11 B is supported by the blower cylinder 10. The middle of the fuel nozzle 11 (an intermediate portion between the base 11B and the tip opening 11A) is supported by the nozzle support 17 so that the position of the tip opening 11A of the fuel nozzle 11 is always on the center axis of the air nozzle portion 8. As a result, it is possible to suppress the vaporization at the offset portion inside the vaporization cylinder 1 and to make the mixed gas ejected from the flame hole 6 of the burner head 4 substantially uniform, so that the flame can be made uniform and the vaporization efficiency can be improved. That is, by disposing the nozzle support 17 at the connection portion A between the air nozzle unit 8 and the blower tube 10, the fuel nozzle 11 is connected to the nozzle support 17 at the time of connecting the blower tube 10 to the air nozzle unit 8. To nozzle insertion hole 18 It can be inserted into, thereby improving the assembling workability.

Also, rising edges 21 and 21 for rectifying the flow of combustion air guided to the air nozzle portion 8 are provided on the peripheral edges of the ventilation openings 19 and 19 provided in the bottom wall portion 17A of the nozzle support member 17. Are provided in the flow direction of the combustion air, so that the turbulence of the combustion air flow generated at the bent portion of the blower tube 10 is rectified by the nozzle support 17, and the rectified primary combustion air is supplied to the air nozzle portion 8. I can guide you. Therefore,
The primary air for combustion can be sent into the vaporization cylinder 1 in a stable flow state from around the fuel nozzle 11, and a part of the discharged fuel adheres to the outer surface near the front end opening 11A of the fuel nozzle 11, resulting in uneven fuel supply. Does not occur, the primary air for combustion and fuel are smoothly supplied into the carburetor 1, a good combustion state is obtained without burning with breathing, and the number of parts is not increased. Since the rectifying effect of the combustion air is obtained, the configuration can be simplified.

[0018]

Since the present invention is constructed as described above, the position of the tip of the fuel nozzle is located on the center axis of the air nozzle, and the flame is made uniform and the vaporization efficiency is improved. By arranging the nozzle support at the connection between the air nozzle and the blower cylinder, the fuel nozzle can be easily inserted into and supported by the nozzle support, and assembling workability is improved.

Also, ventilation at the bottom wall of the nozzle support is provided.
There is a rising edge around the opening to regulate the air flow for combustion.
A structure in which the bevel edge is formed in the direction of air flow
As a result, the turbulence of the combustion air flow generated by the blower tube etc. is reduced by the rising edge formed around the ventilation opening of the nozzle support.
The air can be straightened by the section and guided to the air nozzle, and the combustion air and fuel are smoothly supplied to the inside of the vaporization cylinder, so that the combustion state can be remarkably stabilized and the number of parts is not increased. Since the rectifying effect of the combustion air can be obtained, the configuration can be simplified.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of the overall configuration of a liquid fuel combustion apparatus according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a main part of the same.

FIG. 3 is a sectional view of a nozzle support.

FIG. 4 is a plan view of the nozzle support.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vaporization cylinder 8 Air nozzle part (air nozzle) 9 Combustion blower 10 Blower cylinder 10A Tip of blower cylinder 11 Fuel nozzle 11A Opening of tip of fuel nozzle 11B Base of fuel nozzle 17 Nozzle support 21 Rising edge (rectifying mechanism) Connection

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-20509 (JP, A) JP-A-61-153305 (JP, A) JP-A-60-147012 (JP, A) JP-A-60-147 101413 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) F23D 11/10 F23D 11/40-11/44

Claims (1)

(57) [Claims] 1. A vaporizing cylinder for vaporizing a liquid fuel, an air nozzle provided on a peripheral wall of the vaporizing cylinder, a fuel nozzle having a front end opening facing the inside of the vaporizing cylinder through the air nozzle, and a base of the fuel nozzle. And a blower that has a tip connected to the air nozzle and guides combustion air from the combustion blower to the air nozzle, and a connection between the air nozzle and the blower, a fuel nozzle base. A nozzle support that supports an intermediate portion with the tip opening is arranged, and this nozzle support is
Located around the nozzle insertion hole
A bottom wall provided with a ventilation opening,
Having a cylindrical peripheral wall portion and a fixing flange portion
And the periphery of the ventilation opening in the bottom wall portion is combusted.
The rising edge for rectifying the air flow is
A liquid fuel combustion device formed so as to face in the same direction .