JP2000283411A - Vaporizing oil combustor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a vaporizing oil combustor which does not cause oil dripping even when the combustion amount is reduced and can make good combustion and the combustible range of which can be expanded. SOLUTION: The injection holes 13 of a nozzle 10 for supplying fuel oil are formed through the front end face of the nozzle 10 having an external surface composed of a conical inclined surface 11, and a flat internal surface perpendicular to the axis of the nozzle perpendicularly to the inclined surface 11. The external surfaces of the holes 13 are formed in rounds 13a and the internal surfaces are formed in ellipses 13. As a result, the fuel inlet side areas of the holes 13 become larger than the fuel outlet side areas, and the holes 13 are tapered off as a whole. Therefore, good combustion can be made without causing oil dripping even when the combustion amount is small and, in addition, the combustion range can be expanded, because the injection speed of the fuel is increased and the injection pressure can be received with a wide area.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas-fired petroleum combustion apparatus provided with a heating heater constituting a combustion section of a heater or a water heater.

[0002]

2. Description of the Related Art Conventionally, this type is disclosed in, for example, Japanese Patent Application Laid-Open No. Hei 7-324707, and FIG.
As shown in FIG. 8, the inner and outer surfaces b and c at the tip of the nozzle a are both conical, and the two injection holes d and e penetrate vertically from both sides with respect to the conical surfaces of the inner and outer surfaces b and c. Thus, the fuel oil is uniformly dispersed in the vaporizer so that the vaporized area can be effectively used.

[0003]

By the way, in this conventional apparatus, since the injection holes penetrate both perpendicularly to the inner and outer surfaces, the injection holes d and e formed in the inner and outer surfaces have the same size. The injection pressure applied does not change at both the inlet and the outlet, and has no effect on the fuel injection force. As shown by g in FIG. If the amount of combustion is reduced too much to 6,600 kcal / h or less, fuel oil will not erupt, resulting in oil dripping, making it impossible to further reduce the amount of combustion, and having the problem that the combustion range cannot be expanded. Met.

[0004]

In order to solve the above-mentioned drawbacks, the present invention focuses on this point. In particular, the present invention has a configuration in which an outlet of an air passage for supplying combustion air to a carburetor having a heating heater is provided. The jet outlet is provided with a nozzle of a fuel supply pipe for jetting fuel oil into the carburetor, and the fuel gas and the combustion air are premixed in the carburetor and burned. In the nozzle, the outer surface of the tip is a cone or a polygonal pyramid, and the inner surface is a vertical flat surface. The inner surface is obliquely penetrated so that the outer surface is a perfect circle and the inner surface has an elliptical shape.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The injection hole 13 has a perfect circle 13a on the outer inclined surface 11, but has an elliptical shape 13b because the inner surface of the flat surface 12 penetrates obliquely. Since the inlet area of the fuel oil becomes larger than the outlet area and the jetting speed increases, more injection pressure can be received at the inlet side. It is possible to obtain a good spray of fuel oil and burn it without causing any dripping. As shown in FIG. 9G, the low combustion amount is reduced from 6,600 kcal / h to 45,000 kcal / h even though the high combustion amount is 45,000 kcal / h. , 500 kcal / h, and the combustion range can be expanded from 45,000 kcal / h to 4,500 kcal / h.

Further, the injection hole 13 is set at a symmetric position in the horizontal direction.
Even if it is formed, the inner surface of the nozzle 10 is flat surface 1
Since the injection pressure is 2, the injection pressure acts uniformly on the inlets of the two injection holes 13, and there is no deviation in the flow rate, so that good spray can be obtained from both the injection holes 13.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment of the present invention. Numeral 1 is a horizontal bowl-shaped vaporizer made of aluminum die-cast, and a heating heater 2 composed of a V-shaped sheathed heater is cast in the upper and lower portions, and a vertical vaporizing surface formed vertically on the inner surface. 3 are provided.

Reference numeral 4 denotes a cover for closing the front of the vaporizer 1. At a position facing the vertical vaporizing surface 3, an ejection port 7 for supplying combustion air from a combustion fan 5 through an air passage 6, and an electromagnetic pump A nozzle 10 for spraying the fuel oil fed in 8 via a fuel supply pipe 9 is provided to supply combustion air and fuel oil to the carburetor 1 to form a premixed gas.

[0009] The nozzle 10 has an outer surface at a tip portion having an inclination angle of 1 °.
A 40 ° conical inclined surface 11 is formed, and the inner surface is a vertical flat surface 12. At a symmetric position having an angle of 40 ° in the horizontal direction, the flat surface 12 penetrates vertically to the outer inclined surface 11. It has two ejection holes 13
The outlet 13 of the outer surface has a perfect circle 13a because the outlet side of the outer surface is formed perpendicular to the inclined surface 11, but the inlet side of the inner surface of the flow passage 14 is formed obliquely to the flat surface 12 so as to be elliptical. 13b, so that the area is slightly larger than the exit side.

Reference numeral 15 denotes an aluminum die-casting mixing chamber which communicates with the vaporizer 1 through an outlet 16 at a lower portion of the vaporizer 1 and has a tapered shape while promoting the mixing of the mixture formed in the vaporizer 1. A mixing heater 18, which is supplied to a burner portion 17 formed at the other end and the portion and is energized only at the time of ignition, is cast into a bottom portion on one side.

Reference numeral 19 denotes a combustion chamber having a burner portion 17 at a lower portion. The combustion chamber is provided on the outer periphery from an outer frame 21 via a secondary air passage 20.

Reference numeral 22 denotes a guide path for guiding the primary air to the jet port 7 in the air passage 6, the outer periphery of which is communicated with the secondary air path 20,
The remainder of the primary air is supplied to the burner section 17 as secondary air, and the nozzle 10 is mounted inside.

Next, the operation of one embodiment of the present invention will be described. When the heater 2 is energized to heat the vaporizer 1 to a predetermined temperature, the temperature is detected by a temperature sensor (not shown) provided at an appropriate place, and the combustion fan 5 and the electromagnetic pump 8 are detected.
Is driven, fuel oil is injected from the nozzle 10 into the carburetor 1, and primary air for combustion is supplied from the injection port 7.

In the carburetor 1, the fuel oil injected from the nozzle 10 becomes mist and collides with the vertical vaporizing surface 3, instantaneously vaporizes and becomes a vaporized gas, and is premixed with the primary air supplied from the injection port 7. Then, the mixture is supplied to the burner 17 via the mixing chamber 15 and ignited by appropriate ignition means for combustion.

The combustion is controlled by controlling the driving of the combustion fan 5 and the electromagnetic pump 8 according to the hot water supply and the heating load.
The combustion amount can be varied from a high combustion amount to a low combustion amount within an appropriate combustion range.

At the time of this combustion, the fuel oil injected from the nozzle 10 has an oval 13b on the side where the injection hole 13 is the inner surface of the fuel oil and the perfect circle 13a on the outer side which is the outlet side, as shown in the schematic diagram of FIG. As it becomes tapered from the inlet side to the outlet side, the jetting speed becomes faster, and it is possible to receive a lot of jetting pressure with the ellipse 13b having an enlarged area.
Even if the injection condition is good and a low combustion amount, which caused oil dripping in the past, the fuel can be injected and good combustion can be performed without causing oil dripping. Therefore, the combustion range is 45,000 kcal as shown in G of FIG. / h to a low combustion amount of 4,500 kcal / h, which can be greatly increased to 1:10 compared to the conventional turndown ratio (TDR) of 1: 7.

Further, since both of the two injection holes 13 penetrate through the inner flat surface 12 at the same angle and at an angle of 20 ° with respect to the center line, the injection pressure in the flow passage 14 is equal to the inlet of the two injection holes 13. And the flow rate is not deviated to one side, and can be uniformly dispersed to obtain a good spray.

Next, another embodiment shown in FIG. 5 and FIG. 6 will be described. FIG. 5 shows a case where the outer surface of the tip of the nozzle 10 is a quadrangular pyramid. However, the same effect can be obtained, and the same effect can be obtained if the shape is a polygonal pyramid without being limited to a quadrangular pyramid.

Further, FIG. 6 shows a tip of a flathead screwdriver in which the outer surface of the tip of the nozzle 10 is cut obliquely from both sides toward the vertical center of the tip. The point that the outer surface is an inclined surface 11 is the same. Has the effect of being the easiest to process and can be manufactured at low cost, and has the same effect as the above embodiment.

[0020]

As described above, according to the present invention, even if the amount of combustion is reduced, good combustion can be performed without oil dripping, and the combustion range can be greatly expanded to a turndown ratio of 1:10. It is possible to provide a combustion device that is extremely easy to use.

Alternatively, combustion can always be performed with good spraying without uneven flow rate at equal injection pressure in both injection holes.

[Brief description of the drawings]

FIG. 1 is a sectional view of a vaporized petroleum combustion apparatus to which an embodiment of the present invention is applied.

FIG. 2 is a sectional view of a tip portion of the nozzle.

FIG. 3 is a front view of a tip portion of the nozzle.

FIG. 4 is a schematic view of the injection hole.

FIG. 5 is a front view of an embodiment in which the outer surface of the nozzle tip is a quadrangular pyramid.

FIG. 6 is a front view of the embodiment in which the outer surface of the nozzle tip portion has a minus driver tip shape.

FIG. 7 is a cross-sectional view showing a tip portion of a conventional nozzle.

FIG. 8 is a schematic view of the conventional injection hole.

FIG. 9 is a characteristic diagram showing a combustion amount according to the related art and the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 vaporizer 2 heater 5 combustion fan 8 electromagnetic pump 9 combustion supply pipe 10 nozzle 11 inclined surface 12 flat surface 13 injection hole 13a true circle 13b ellipse

Continued on the front page F term (reference) 3K052 GB04 GB06 GC05 GD08 GE07 JA01 3K056 AA08 AD01 DA05

Claims (3)

[Claims] An air outlet for supplying combustion air to a carburetor provided with a heater for heating is provided with a nozzle of a fuel supply pipe for discharging fuel oil into the carburetor.
In a configuration in which a vaporized gas of fuel oil and combustion air are premixed in a carburetor and burned, the nozzle is
The outer surface of the tip is conical or polygonal pyramid, and the inner surface is a vertical flat surface, and the fuel injection hole penetrating the inner and outer surfaces is perpendicular to the inclined outer surface and is flat for the inner surface which is flat. A vaporized petroleum combustion device characterized in that it is obliquely penetrated and the outer surface is a perfect circle and the inner surface is elliptical. 2. The nozzle according to claim 1, wherein the outer surface of the tip of the nozzle has a minus screwdriver tip shape obliquely cut from both sides toward the tip, and an injection hole is formed in the cut slope. Evaporative oil combustion equipment. 3. The injection hole is positioned at a symmetric position in the horizontal direction.
3. The vaporized petroleum combustion apparatus according to claim 1, wherein the apparatus is formed individually.