JP4077361B2 - Gun type burner - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a gun-type burner used as a burner for a domestic hot water supply device or the like.
[0002]
[Prior art]
Conventionally, in this type, a secondary air passage is formed inside the burner outer cylinder with the burner outer cylinder, and a nozzle body for fuel injection and a primary stabilizer for rotating the primary air are provided. And a burner inner cylinder provided with a plurality of air holes in the peripheral wall, and further provided with a primary stabilizer and a converging body for polymerization at the central hole portion in the rectifying cylinder, and a secondary from the gap between the overlapping portions. The ignition performance was improved by adjusting the air ejection direction and flow velocity. (For example, refer to Patent Document 1.)
[0003]
[Patent Document 1]
Japanese Patent No. 3100362 [0004]
[Problems to be solved by the invention]
By the way, with this conventional device, it is not always possible to maintain an optimal gap due to component variations, etc., and if there is secondary air supply from the outer periphery to the primary air and fuel injection parts, There was a problem that turbulence occurred in the flow, and good combustion could not be performed.
[0005]
[Means for Solving the Problems]
The present invention for solving the above drawbacks by focusing on this point, in particular its configuration, by forming an air passage between the burner outer cylinder on the inner side of the burner outer cylinder, the nozzle body for the fuel injection and the secondary A flow straightening cylinder provided with a primary stabilizer for swirling air, a burner inner cylinder provided with a plurality of air holes in the peripheral wall, and further provided with a blower for supplying combustion air behind the burner outer cylinder, The flow straightening cylinder includes a converging body having a central hole for converging primary air and discharging it together with the injected fuel. Further, the primary stabilizer in front of the converging body has an opening having a diameter larger than that of the central hole. In the periphery of the central hole where the converging body and the primary stabilizer are overlapped, a step pressing portion that is in close contact with the primary stabilizer is formed, Hole edge It is is provided with a standing wall which rises forward.
[0006]
According to this, the supply of the secondary air from the outer periphery to the primary air and the fuel injection portion is surely prevented, the primary air flow velocity is not disturbed, and good combustion is always obtained, and It has the effect of producing products with the same performance without changing performance due to variations in parts.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Next, a gun type burner attached downward according to the present invention will be described with reference to an embodiment shown in the drawings.
Reference numeral 1 denotes a burner outer cylinder having a bottomed cylindrical shape that is squeezed in two stages toward the front end, and a wind tunnel 3 for injecting combustion air from a blower 2 mounted sideways is fixed to the rear end.
[0008]
Reference numeral 4 denotes a rectifying cylinder provided inside the burner outer cylinder 1 by forming an air passage 5 between the burner outer cylinder 1 and a fuel injection connected to an electromagnetic pump 6 and an oil proportional valve 7 on the inside. Nozzle body 8 for ignition, ignition electrode 9 for igniting the fuel to be injected, and bowl-shaped focusing body 11 for focusing primary air flowing in front of the nozzle body 8 and discharging it from the central hole 10 Further, an opening 12 having a diameter larger than that of the central hole 10 is provided in front of the converging body 11, and the inflow from a plurality of secondary air holes 13 formed in the peripheral wall by overlapping the central hole 10 portion. A primary stabilizer 15 is provided for supplying secondary air to be swirled by a swirl vane 14 formed by cutting and raising around the opening 12.
[0009]
Further, in the periphery of the central hole 10 where the focusing body 11 and the primary stabilizer 15 come into contact, the secondary air from the two gaps collides with the primary air from the central hole 10 perpendicularly from the entire circumference, thereby disturbing the primary air. In order to prevent poor mixing with the injected fuel and prevent good combustion from being obtained, a stepped portion 16 that is in close contact with the primary stabilizer 15 is formed around the central hole 10 to further reliably provide the secondary. A standing wall 17 that rises forward is provided at the end of the central hole 10 so as to prevent interference of the air with the primary air discharged from the central hole 10.
[0010]
18 is a burner inner cylinder that is provided inside the burner outer cylinder 1 while holding the air passage 5 as in the case of the flow straightening cylinder 4, and includes a small-diameter combustion cylinder 19 and a large-diameter combustion cylinder 20 that are connected to the tip of the primary stabilizer 15. A plurality of tertiary air holes 21 are formed in the upper and lower stages on the peripheral walls of the small-diameter combustion cylinder 19 and the large-diameter combustion cylinder 20, and the small-diameter combustion cylinder 19 is formed at the bottom of the large-diameter combustion cylinder 20. A secondary stabilizer 22 for turning tertiary air in the same direction as the primary stabilizer 15 is formed on the outer periphery of the connecting portion.
[0011]
The wind tunnel 3 is formed in a box shape in which one side is connected to the blower 2 and the bottom is connected to the burner outer cylinder 1 and the other is closed, and temporarily stores combustion air supplied from the blower 2. A first rectifying plate 24 in which a plurality of primary rectifying holes 23 are arranged in a circle so as to be orthogonal to the combustion air is provided on the side of the nozzle body 8 communicating with the burner outer cylinder 1 of the barrel 3. On the downstream side of the one rectifying plate 24, a cup-shaped rectifying tube guide 25 having a diameter that overlaps with a circle drawn by the primary rectifying hole 23 and fitted with the end of the rectifying tube 4 is provided at one end opening. In addition, a plurality of second rectifying holes 26 are formed in the peripheral wall parallel to the flow of combustion air of the rectifying tube guide 25, and instead of forcibly pushing in, the combustion air flows into the primary air as a natural flow. It will be.
[0012]
Reference numeral 27 denotes a third rectifying plate for fixing the fuel injection nozzle body 8 at the bottom of the rectifying cylinder 4 and allowing primary air to flow into the rectifying cylinder 4. Three rectifying holes 28 are provided, and the primary air that has flowed into the rectifying cylinder guide 25 is passed through the third rectifying hole 28 to be further rectified and supplied to the rectifying cylinder 4.
[0013]
Reference numeral 29 denotes a tertiary air outlet composed of a gap formed between the tip of the burner outer cylinder 1 and the tip of the burner inner cylinder 17, which supplies tertiary air to the flame formed outside the burner and suppresses the spread of the flame. is there.
Reference numeral 30 denotes an igniter connected to the ignition electrode 9.
[0014]
Next, the operation of one embodiment of the present invention will be described.
If the blower 2 and the electromagnetic pump 6 are now driven, the combustion air is first supplied into the wind tunnel 3, where it is temporarily stored, and after eliminating the directionality due to the rotational force, the flow is directed downward, and is orthogonal to this flow. By passing through the first rectifying hole 23 of the first rectifying plate 24 arranged in this manner, rectification is performed so that the flow direction is entirely matched, and the flow of the rectifying cylinder guide 25 parallel to the flow direction flows through the air passage 5. While being naturally rectified from the second rectifying hole 26, it flows into the rectifying cylinder guide 25, and further passes through the third rectifying hole 28 of the third rectifying plate 27, and the final rectification is performed. The flow is supplied into the rectifying cylinder 4.
[0015]
The primary air that has flowed into the rectifying cylinder 4 is collected by the bowl-shaped converging body 11 and discharged into the burner inner cylinder 18 together with the fuel injected from the nozzle body 8 through the central hole 10. At the same time, the primary stabilizer 15 forms a swirling flow of secondary air on the outer periphery of the mixture of primary air and fuel to improve the mixing of the secondary air. Furthermore, in the burner inner cylinder 18, fresh tertiary air is supplied from the upper and lower tertiary air holes 21, and swirled tertiary air is supplied from the secondary stabilizer 22, and a large flame is formed outward. Good combustion.
[0016]
At this time, in the central hole 10 portion of the focusing body 11, the gap is completely closed by the stepped portion 16 and the standing wall 17, so that secondary air having a high flow velocity is not supplied from the outer periphery. There is no need to disturb the flow rate of the primary air, and good combustion can always be obtained.
[0017]
Further, the combustion air supplied to the combustion section as primary air, secondary air, and tertiary air is reliably rectified by the wind tunnel 3 and the rectifying cylinder guide 25 that are the inlets, so that there is no deviation in the flow direction or amount. In particular, the primary air is rectified in the second, third and third times, and good combustion is always performed without causing abnormal combustion.
[0018]
Further, the first rectifying hole 23 is orthogonal to the flow of the combustion air, so that the entire combustion air can be forcibly rectified, and the rectification in the basic flow direction is reliably performed. In parallel with the flow of combustion air, primary air can naturally flow in, so that smooth combustion without soot can always be performed.
[0019]
【The invention's effect】
As described above, according to the present invention, the supply of the secondary air from the outer periphery to the primary air and the fuel injection portion is surely prevented, and there is no fear that the flow rate of the primary air is disturbed, and always good combustion can be obtained. In addition, there is an effect that a product having the same performance can be produced without changing the performance due to variations in parts.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a gun type burner with an embodiment of the present invention.
FIG. 2 is an enlarged cross-sectional view of the main part.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Burner outer cylinder 2 Blower 3 Wind tunnel 4 Rectifier cylinder 5 Air passage 8 Nozzle body 10 Central hole 11 Focusing body 12 Opening 13 Secondary air hole 14 Swirling blade 15 Primary stabilizer 16 Step pushing part 17 Standing wall 18 Burner inner cylinder

Claims (1)

To form an air passage between the burner outer cylinder on the inner side of the burner outer cylinder, a flow-guide cylinder provided with a primary stabilizer to pivot the nozzle body and the secondary air for fuel injection, a plurality of air holes in the peripheral wall A burner inner cylinder provided, and further provided with a blower for supplying combustion air at the rear of the burner outer cylinder. The primary stabilizer in front of the focusing body has an opening larger in diameter than the central hole, and is provided with a primary stabilizer in which swirl blades are formed by overlapping the central hole and cutting and raising the outer periphery of the opening. In the periphery of the central hole where the converging body and the primary stabilizer are overlapped, a stepped portion that is in close contact with the primary stabilizer is formed, and a standing wall that rises forward is provided at the end of the central hole. gun Taipuba Na.

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