JPH0412338Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a liquid fuel spray burner used in hot water boilers and the like.

[Conventional technology]

This type of liquid fuel spray burner has become smaller, lighter, and thinner in water heaters, etc., and the diameter of the combustion chamber has become around 200 mm. Therefore, it is necessary to install the fuel spray burner on the side wall of the combustion chamber and burn it sideways. If the flame is not shortened, the flame will hit the furnace wall, resulting in poor combustion and loud combustion noise.

The applicant has worked on improving liquid fuel spray burners and has developed the burner shown in Figure 3.
Referring to FIG. 3, this burner has a rectifier plate between the nozzle 32 and a burner casing 31 which supports a liquid fuel spray nozzle 32 in the center and is provided with a combustion air inlet 39 for taking in combustion air from around the nozzle. 44 sandwiched therein, a flame stabilizing plate 50 and a draft tube 51 are provided in front of the nozzle 32, and a blower 37 is connected to the burner casing 31.

[The problem that the idea aims to solve]

To shorten the flame, supply secondary air to promote the mixing of fuel and combustion air, but if the balance with the primary air is poor, the flame will completely attach to the stabilizer and burn, causing the combustion air in the stabilizer to There is a problem that soot may adhere to areas that cannot pass through, or the flame may be blown away, making combustion unstable and creating excess air, especially when the distance between the blower outlet and the flame holding plate is short. In this case, the air volume in the circumferential direction is uneven, and the flame is also uneven, making it unstable and having a strong tendency to produce excess air.However, in the conventional example, if the balance between primary air and secondary air is poor, the above-mentioned drawbacks always occur. The present invention has been made in view of the above-mentioned facts, and aims to provide a liquid fuel spray burner that can perform stable combustion while keeping the blower outlet and flame stabilizing plate close to each other. purpose.

[Means to solve the problem]

The above problem was solved by installing a rectifying ring in front of the flame stabilizing plate, the tip of which was narrowed to a diameter smaller than the inner diameter of the first cylindrical body.
A second cylindrical body is fixedly fixed to the outer periphery of the cylindrical body without a gap, and a rising part is provided with the side near the rectifying ring of the second cylindrical body disposed in front of the rectifying ring facing the inner surface of the entire circumference, and the inner peripheral end surface of the rising part is provided. A substantially uniform gap is formed around the entire circumference by the outer peripheral surface of the rectifying ring, and the mixture passes from the air passage between the first cylinder and the third cylinder through the gap between the rectifying ring and the rising part. The problem is solved by providing a liquid fuel spray burner characterized in that the combustion air supplied to the combustion chamber stably suppresses the flame formed in front of the flame holding plate regardless of the increase in the amount of combustion air. .

[Effect]

With the above-mentioned configuration, the swirling blades of the flame stabilizing plate prevent the flame from spreading, but the configuration of constricting the flame inside the rectifying ring 10 alone has a small effect of gathering the flame inside. Therefore, the second cylindrical body 11
A rising portion 13 is provided, and a gap 14 is formed between the rising portion 13 and the rectifying ring 10, thereby directing the secondary air passing through the ventilation path 17 to the gap 14.
This allows the flame to flow more forcefully into the mixing combustion chamber 15, thereby suppressing the flame as well as mixing in air.

〔Example〕

Hereinafter, this invention will be described in detail with reference to embodiments shown in the drawings.

In FIG. 1, numeral 1 denotes a nozzle having a nozzle opening 2 at its tip, which is located inside a first cylinder 3. As shown in FIG. The first cylindrical body 3 is provided with a flame stabilizing plate 6 having a central opening 4 and a swirling blade 5 in front of the nozzle opening 2, and an end plate 8 having a rear air hole 7 in the rear thereof. Configure.

Reference numeral 10 is a rectifying ring whose tip is narrower than the diameter of the first cylindrical body 3, and is located in front of the flame stabilizing plate 6, and is fixed to the outer periphery of the first cylindrical body 3 without any gaps.

Reference numeral 11 denotes a second cylindrical body that is located in front of the rectifying ring 10, has a plurality of air holes 12 around it, and has a rising portion 13 with the side closer to the rectifying ring 10 facing inward all around. A gap 14 is maintained uniformly over the entire circumference between the inner circumferential end surface of the portion 13 and the outer circumferential surface of the rectifying ring 10, and the second cylindrical body 11 and the rectifying ring 1
0 and flame stabilizing plate 6 constitute a mixing combustion chamber 15.

16 is a third cylindrical body, which includes an end plate 8, a first cylindrical body 3,
The rectifying ring 10 and the second cylindrical body 11 form a ventilation furnace 17.
Configure.

The third cylindrical body 16 is connected to a blower 19 via an air passage 18.
connected to. 20 is an air outlet, 21 is an oil pipe, 2
2 is an ignition electrode.

Next, the operation of the device configured as described above will be explained. When the blower 19 is driven, combustion air is passed through the air passage 18 from the outlet 20 to the air passage 1.
7.

Combustion air passes through the rear air hole 7 and enters the nozzle port 2.
The fuel is fed into the spray chamber 9 from the rear, and the fuel is fed into the central hole 4.
It passes through the swirl vanes 5 and flows toward the mixing combustion chamber 15.

At the same time, other combustion air, i.e. secondary air,
The air is supplied from the air passage 17 through the gap 14 between the straightening ring 10 and the rising portion 13 along the straightening ring 10 to the mixing combustion chamber 15, and a part of the air is supplied to the mixing combustion chamber 15 through the air hole 12. With this configuration, the flame formed in front of the flame stabilizing plate 6 is suppressed by the secondary air, and a stable flame can be obtained even if the amount of combustion air is increased. This also prevents the flame-holding plate from getting dirty.

When the pump P is driven and fuel is injected from the nozzle port 2 and ignited by the ignition electrode 22, the ejected flame passes through the central hole 4 and is swirled by the combustion air that has passed through the swirling vane 5. The mixture is mixed with combustion air from the air hole 12 to form a flame and burn.

[Effect of idea]

As described above, according to the present invention, the combustion air is
Since the fuel is supplied individually to the mixing combustion chamber 15 through the fuel spray chamber 9 and the ventilation path 17, the balance between the primary air and the secondary air is ensured, and the air volume from the center opening 4 of the flame-holding plate 6 and the swirling vane 5 is maintained. Since the combustion air from the gap 14 flows along the straightening ring 10 even if
Since the flame swirled by the swirling vanes 5 is suppressed by the flame stabilizing plate 5, a stable flame can be obtained even if the amount of combustion air increases, and low-speed combustion air without turbulence flows near the nozzle opening. Therefore, there is provided a burner for hot water boilers, etc., which can uniformly atomize liquid fuel, reduce combustion noise, and be smaller, lighter, and thinner.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view of an embodiment of the present invention, and Fig. 2 is a longitudinal sectional view of an embodiment of the present invention.
3 is a longitudinal sectional view of a liquid fuel spray burner developed by the applicant. In the figure, 1 is a nozzle, 2 is a nozzle opening, 3 is a first cylinder, 4 is a central hole, 5 is a swirl vane, 6 is a flame holding plate,
7 is a rear air hole, 8 is an end plate, 9 is a fuel spray chamber, 1
0 is a rectifier ring, 11 is a second cylindrical body, 12 is an air hole, 13 is a rising part, 14 is a gap, 15 is a mixing combustion chamber, 16 is a third cylindrical body, 17 is an air passage, and 18 is a wind duct. , 19 is a blower, 20 is an air outlet, 21 is an oil pipe, and 22 is an ignition electrode.

Claims (1)

[Claims for Utility Model Registration] In front of the flame-holding plate 6, a rectifying ring 10 whose tip is narrowed to a diameter smaller than the inner diameter of the first cylinder 3 is fixed to the outer periphery of the first cylinder 3 without any gap. a second cylindrical body 1 provided and arranged in front of the rectifying ring 10;
A rising portion 13 is provided with the side near the rectifying ring 10 of No. 1 facing toward the inner surface of the entire circumference, and a substantially uniform gap 14 is formed around the entire circumference between the inner circumferential end surface of the rising portion 13 and the outer circumferential surface of the rectifying ring 10. The combustion air supplied from the air passage 17 between the first cylinder 3 and the third cylinder 16 to the mixing combustion chamber 15 through the gap 14 between the straightening ring 10 and the rising part 13 is flame stabilized. A liquid fuel spray burner characterized in that a flame formed in front of a plate 6 is stably suppressed regardless of an increase in the amount of combustion air.