JP3685376B2 - Combustion equipment - Google Patents

Description

[0001]
[Technical field to which the invention belongs]
The present invention relates to a combustion apparatus for a domestic heating appliance such as an oil fan heater.
[0002]
[Prior art]
Conventionally, in this type, for example, as shown in Japanese Patent Publication No. 2-23767, as shown in FIG. 6, a burner head ring c having one end connected to a vaporizing cylinder b is provided on the outer periphery of the burner head a. Is heated back to the vaporization cylinder b as heat for vaporizing the fuel oil, and the secondary air d supplied from the outside is guided to the secondary flame e to cool the secondary flame e and lower the temperature. Thus, the generation of nitrogen oxides was reduced.
[0003]
[Problems to be solved by the invention]
By the way, in this conventional one, since the secondary flame e is cooled rapidly and in large quantities by the secondary air d, the nitrogen oxide is certainly reduced, but conversely, the value of the nitrogen dioxide in the nitrogen oxide. However, it is very difficult to reduce both at the same time.
[0004]
[Means for solving problems]
This invention pays attention to this point and solves the above-mentioned drawbacks. In particular, the structure thereof includes a bottomed cylindrical vaporization cylinder that includes a heater and premixes vaporized gas and combustion air, and a gas mixture from the vaporized cylinder. A burner head having a cylindrical shape that burns in a plurality of flame holes provided on the peripheral wall, and a burner that covers the peripheral wall of the burner head and heats the vaporization heat back to the vaporization cylinder and guides secondary air from the outer periphery The burner head flame holes are arranged in two upper and lower stages, the lower flame hole is made smaller in diameter than the upper flame hole, and the outer burner head ring is connected to each upper and lower flame hole. It has a two-stage structure having upper and lower erected walls that come into contact with the formed primary flame .
[0006]
DETAILED DESCRIPTION OF THE INVENTION
The air-fuel mixture premixed in the vaporizing cylinder 1 flows into the upper burner 6 and is ejected from here through the upper and lower flame holes 7 and 8 on the peripheral wall. Every 8th, a primary flame A is formed, and a large secondary flame B is formed on the outside thereof. This secondary flame B is prevented from spreading by the outer burner head ring 11 and rises upward. The hour burner head ring 11 is in contact with the secondary flame B and heats the combustion heat to the vaporizing cylinder 1 satisfactorily.
[0007]
At this time, the secondary air C supplied from below the outer periphery of the burner head ring 11 rises and travels toward the secondary flame B, but is interrupted by the step 12 of the burner head ring 11 and is largely bypassed. Therefore, since it is supplied only to the upper part of the secondary flame B and is not supplied rapidly and in large quantities, the generation of the entire nitrogen oxide can be reduced without increasing the nitrogen dioxide, and the strength. In particular, the presence of the stepped portion 12 can strengthen the entire burner head ring 11.
[0008]
Further, the comparatively large primary flame A formed in the upper flame hole 7 of the large diameter comes into contact with the upper standing wall 13 on the large diameter side of the burner head ring 11 and is also formed in the lower flame hole 8 of the small diameter. Small primary flame A is in contact with the lower standing wall 14 on the small diameter side of the burner head ring 11, so that heat back can be performed well by heat conduction, and the combustion temperature can be surely lowered, and nitrogen oxides Can be further reduced.
[0009]
【Example】
Next, a combustion apparatus according to the present invention will be described with reference to an embodiment shown in the drawings.
1 is a bottomed cylindrical vaporization cylinder, the heater 2 which consists of a sheathed heater is cast in an upper peripheral wall, and it is hold | maintained at 220-250 degreeC by the energization control by the temperature sensor 3 which consists of the thermistor provided in the lower part, The fuel oil supplied from the spray nozzle 4 placed on the lower peripheral wall opposite to the temperature sensor 3 is used as vaporized gas, and the combustion air supplied from the blower port 5 is premixed.
[0010]
6 is a cylinder-shaped burner head covered with the upper opening of the vaporizing cylinder 1, and has peripherally arranged flame holes 7 and 8 arranged in two upper and lower stages, and the upper flame hole 7 has a diameter of 6 to 7 mm. The lower flame holes 8 have a slightly smaller diameter, a diameter of 5 to 5.5 mm, and 16 pieces are formed on the entire circumference. The lower flame holes 8 are in close contact with the inner and outer surfaces of the peripheral wall on which the flame holes 7 and 8 are formed. Outer metal nets 9 and 10 are provided.
[0011]
11 is a burner head ring having one end connected to the upper end of the vaporizing cylinder 1 and standing on the outer periphery of the burner head 6 so as to gradually increase in diameter and having a step portion 12 formed by upper and lower stage flame holes 7 and 8. In contact with the primary flame A and the secondary flame B to be heated and heat back of the vaporization heat to the vaporizing cylinder 1, and contact with the large primary flame A formed in the large diameter upper flame hole 7. The upper standing wall 13 is formed at a position where the lower standing wall 13 is formed, and the lower standing wall 14 is formed at a position in contact with the small primary flame A formed in the lower flame hole 8 having a small diameter.
[0012]
An ignition electrode 15 is provided on the outer periphery of the burner head 6 and ignites by discharge between the burner head 6. On the opposite side of the diagonal line, a flame rectifying action is used to set the ignition and combustion states as flame voltages. A frame rod 16 for detection is provided.
[0013]
Reference numeral 17 denotes a trumpet-shaped first collecting plate that partitions the vaporizing cylinder 1 and the burner head 6. After the air-fuel mixture is once gathered at a portion suspended in the vaporizing cylinder 1, it is again between the second collecting plate 18. Aggregates after diffusion, promotes mixing by repeating diffusion and aggregation, and suppresses the flow rate of the air-fuel mixture. The first and second aggregate plates 17 and 18 are previously joined and integrally molded It is.
[0014]
Reference numeral 19 denotes a rectified cylindrical rectifying cylinder provided on the second collecting plate 18, and has a plurality of rectifying holes 20 on the upper side, and the upper and lower stages of the burner head 6 while rectifying the inflowing air-fuel mixture. It guides to the flame holes 7 and 8.
[0015]
Reference numeral 21 denotes a combustion fan composed of a turbofan that supplies combustion air to the vaporizing cylinder 1, and supplies indoor air sucked from the suction port 22 from the blower port 5 through the blower passage 23.
[0016]
Reference numeral 24 denotes an oil feed pipe for supplying fuel oil pumped by the electromagnetic pump 25 into the vaporizing cylinder 1, and a spray nozzle 4 protruding into the vaporizing cylinder 1 is provided at the tip of the oil feed pipe.
[0017]
A fixed tank 26 is connected to the other end of the oil feeding pipe 24, and temporarily stores fuel oil supplied from a cartridge-type oil supply tank 27 via a valve mechanism 28. The fuel oil amount is detected, and fuel is supplied at a predetermined amount or less. A float type oil supply detection means 29 for informing and a filter cylinder 30 for preventing the inflow of dust into the oil feeding pipe 24 are provided.
[0018]
Reference numeral 31 denotes a rectifying network which is mounted on the outer periphery of the rectifying cylinder 19 and extends upward, and finally rectifies the air-fuel mixture discharged from the rectifying cylinder 19.
[0019]
Next, the operation of the embodiment of the present invention will be described.
By performing a known operation, the heater 2 is energized to raise the temperature of the vaporizing cylinder 1 to a preset vaporizable temperature.
[0020]
When the vaporizing cylinder 1 reaches a set temperature, the temperature sensor 3 detects this and activates the combustion fan 21, the electromagnetic pump 25, and the ignition electrode 15, respectively.
[0021]
As a result, the combustion fan 21 supplies combustion air into the vaporizing cylinder 1 from the blower opening 5 via the air passage 23, and the fuel oil is vaporized from the spray nozzle 4 via the oil feed pipe 24 by driving the electromagnetic pump 25. The fuel oil is instantaneously vaporized in the vaporizing cylinder 1 and premixed with the combustion air.
[0022]
Then, the air-fuel mixture passes through the first and second collecting plates 17 and 18 and flows into the upper rectifying cylinder 19 in a state where the flow velocity is suppressed while repeating collection and diffusion, and is mixed in the rectifying cylinder 19. Mixing is further promoted sufficiently, and after being rectified through the rectifying hole 20, the gas is supplied to the upper and lower flame holes 7 and 8 of the burner head 6 for good combustion.
[0023]
The primary flame A and the secondary flame B formed by the upper and lower flame holes 7 and 8 are guided upward without greatly spreading outward due to the flame holding action of the outer burner head ring 11. The heat of the burner head ring 11 that rises in temperature due to the flame action is heated back to the vaporizing cylinder 1 and used for the heat of vaporization.
[0024]
Further, a part of the air supplied from a convection fan (not shown) for releasing hot air provided behind the burner head 6 is supplied as secondary air C, and this secondary air C is supplied to the outer burner head ring. 11, and is supplied to the secondary flame B. At this time, it is interrupted by the step portion 12 of the burner head ring 11, and is temporarily supplied around the outside. As a result, the supply of secondary air C reduces the combustion temperature and reduces the generation of nitrogen oxides. However, generation of nitrogen dioxide can be suppressed, and good combustion can be obtained.
[0025]
In addition, the burner head ring 11 that is easily deformed by being exposed to the combustion flame is reinforced by the stepped portion 12, so that the burner head ring 11 that is strong against deformation can be obtained.
[0026]
Further, the upper standing wall 13 of the two-stage burner head ring 11 is formed so as to contact a relatively large primary flame A formed by the upper stage flame hole 7, and the lower stage standing wall 14 is formed by the lower stage flame hole 8. Since it is formed so as to be in contact with the relatively small primary flame A that is formed, the temperature of the primary flame A is always lowered in contact with the burner head ring 11, and generation of nitrogen oxides can be surely reduced, and heat back is also achieved. Even better.
[0027]
【The invention's effect】
As described above, according to the present invention, it is possible to provide a combustion apparatus that can be used with confidence by reducing the amount of nitrogen oxides and nitrogen dioxide generated with an extremely simple configuration.
[0028]
Furthermore, the upper and lower erected walls of the two-stage burner head ring are always in contact with the primary flame formed in the upper and lower flame holes, and the temperature can be reliably lowered to suppress the generation of nitrogen oxides and heat back. Can be further improved.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a combustion apparatus according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view of the main part half.
FIG. 3 is an explanatory view of a main part half showing a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Vaporization heater 2 Heater 6 Burner head 7 Upper flame hole 8 Lower flame hole 11 Burner head ring 12 Step part 13 Upper stage standing wall 14 Lower stage standing wall

Claims (1)

A bottomed cylindrical vaporization cylinder that includes a heater and premixes vaporized gas and combustion air, and a cylinder-shaped burner head that burns the mixed gas from the vaporization cylinder in a plurality of flame holes provided on the peripheral wall When, along with heat back heat of vaporization in the vaporizing tube covers the peripheral wall of the burner head, in the one having a burner head ring for guiding the secondary air from the outer periphery, the upper and lower flame hole of the burner head 2 In addition to the step arrangement, the lower flame hole has a smaller diameter than the upper flame hole, and the outer burner head ring has a two-stage structure having upper and lower stage standing walls that contact the primary flame formed in each upper and lower flame hole. Combustion device characterized by things.

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