JPH0245614Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a pressure spray type burner that uses kerosene as fuel and is used in household water heaters and the like.

(Prior Art) Conventionally, this type of oil burner has a nozzle 2 equipped with a nozzle opening 1 at the tip, as shown in FIGS. 3 and 4.
into the cylindrical inner cylinder 3, the primary air inlet 4 is opened on the rear side of the nozzle 2, and the primary air is introduced into the inner cylinder 3.
A swirler 6 having swirling vanes 5 swirls the primary air to perform primary combustion, and an outer barrel 7 is provided on the outer periphery of the inner barrel 3 so that the air between the inner barrel 3 and the outer barrel 7 A secondary air passage 8 is formed in the inner cylinder 3, and a secondary air passage 8 is formed in the inner cylinder 3.
There is a device that supplies secondary air from the secondary air port 9 to perform secondary combustion, but this swirler 6 has a circular hole 10 in the center.
The rotating blade 5 is arranged so as to communicate with the round hole 10.

(Problem to be solved by the invention) In the conventional structure of the swirler, the swirling blades 5 are cut and raised at an angle so as to be in contact with the central circular hole 10, so the swirling flow around the swirler 6 is reduced. Because the recirculation area and the recirculation area secondary to this swirling flow tend to interfere with each other, there are areas where kerosene and air mix unevenly, resulting in unstable fires and high combustion noise. . Therefore, in order to achieve stable combustion, it was necessary to strictly mix the primary air and secondary air for combustion. That is, when there is too much primary air, the flame stability in the swirler 6 deteriorates, and the ignitability and combustibility tend to become unstable. In order to improve flame stability in the swirler 6 and achieve stable combustion, it is necessary to reduce the amount of primary air, and therefore it is necessary to reduce the opening area of the primary air inlet 4. Therefore, the combustion is mainly secondary combustion, resulting in a short flame, but the combustion noise is high.
The pressure loss in the burner was also large, necessitating the use of a large fan.

The present invention was made in view of the above-mentioned drawbacks, and an object of the present invention is to provide a swirler that can reduce pressure loss in the burner section and reduce combustion noise.

(Means for Solving the Problems) Description will be made based on FIGS. 1 and 2 together with examples.

A nozzle 2 equipped with a nozzle port 1 at the tip is inserted into a cylindrical inner cylinder 3, a primary air introduction port 4 is opened at the rear side of the nozzle 2, and primary air is introduced into the inner cylinder 3. , a swirler 6 having swirling vanes 5 swirls the primary air to perform primary combustion, and an outer cylinder 7 is provided around the outer circumference of the inner cylinder 3, and secondary air is circulated between the inner cylinder 3 and the outer cylinder 7. In a device that forms a passage 8 and performs secondary combustion by supplying secondary air from a secondary air port 9 provided in the inner cylinder 3, a round hole 10 is provided at the center of the swirler 6, and the air around this round hole 10 is A ring-shaped stabilizing plate 12 is provided at the portion without the swirling vanes 5, and a plurality of swirling vanes 5 are provided around the ring-shaped stabilizing plate 12.

(Function) Primary air for combustion enters the inner cylinder 3 from the primary air inlet 4, is given a swirling flow by the swirler 6,
The kerosene pressurized by the pump 15 is sent to the nozzle 2 through the oil pipe 14, sprayed from the nozzle port 1, mixed with primary air, and swirled while being held flame-stabilized by the swirler 6 for primary combustion. The secondary air supplied from 9 causes secondary combustion. According to the present invention, when the primary air swirls, the swirler 6 is used to form a clear boundary region between the swirling flow region around the swirler 6 and the recirculation region secondarily generated by this swirling flow. Since a part without swirling vanes, that is, a ring-shaped stabilizing plate 12 is provided around the circular hole 10 at the center of the kerosene, the swirling flow area and the recirculation area do not interfere with each other, and the mixing and diffusion of kerosene and air becomes uniform and stable. The result is a combustion with a high degree of combustion. For the above reasons, the flame stability in the swirler 6 is improved, so the amount of primary air can be increased, and the opening area of the primary air inlet 4 can be increased. Also, if a part of the swirling blade 5 is made parallel to the stabilizer plate 12,
The residence time of the swirling flame that has undergone primary combustion in the inner cylinder 3 becomes longer, and it is possible to effectively perform primary combustion before proceeding to secondary combustion, making it less likely that combustion will be dominated by secondary combustion as in the past. , better and more stable combustion can be obtained.

In addition, when a part of the swirling vane 5 is made parallel to the stabilizer plate 12, if the gap between the parallel part of the swirling vane 5 and the body of the swirler 6 is too small, the swirling flow will be too strong and the pressure loss will increase. On the other hand, if the gap is too large, the swirling flow will be weakened and the mixing of kerosene and air will be poor.
The gap is preferably 3 to 5 mm. Furthermore, the swirl vane 5
is connected by the ring-shaped stabilizing plate 12 and the main body of the swirler 6, so that the positional accuracy of the swirler blade 5 is ensured.

(Effects of the invention) According to the invention, flame stability in the swirler 6 is improved, making it possible to supply a large amount of primary air for combustion, and increasing the opening area of the primary air inlet 4. The pressure loss in the burner section can be reduced, and a small fan can be used. Furthermore, since kerosene and air can be mixed and diffused evenly, primary combustion can be carried out effectively before moving on to secondary combustion, resulting in good and stable combustion performance with short flame and low noise. can. That is, according to the present invention, a liquid fuel combustion device with short flame, low noise, and stable performance can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing one embodiment of the present invention;
The figures are a view in the direction of arrow P in FIG. 1, FIG. 3 is a sectional view showing a conventional example, and FIG. 4 is a view in direction of arrow Q in FIG. Explanation of symbols, 1... Nozzle mouth, 2... Nozzle,
3...Inner cylinder, 4...Primary air inlet, 5...Swirl vane, 6...Swirler, 7...Outer cylinder, 8...Secondary air passage, 9...Secondary air port, 10 ...Round hole, 12
... Stabilizer plate, 13 ... Air blower, 14 ... Oil pipe,
15...Pump.

Claims (1)

[Claims for Utility Model Registration] 1. In a liquid fuel combustion device, an air passage is formed between an inner cylinder and an outer cylinder having a larger diameter to be ventilated by a blower, and liquid fuel spray provided inside the inner cylinder. A secondary air inlet is opened in front of the nozzle opening of the nozzle for combustion, and a primary air inlet is opened in the rear side to supply combustion air to the inside of the inner cylinder, and in front of the nozzle opening,
A swirler having a round hole in the center and a plurality of swirling vanes around it is provided to give swirl to the primary air. A liquid fuel combustion device characterized in that a stabilizer plate having a shape of the shape is provided and a plurality of swirl vanes are provided around the stabilizer plate. 2. The liquid fuel combustion device according to claim 1, wherein a part of the swirling vane is parallel to the ring-shaped stabilizing plate.