JP2955808B2 - Thermal spray burner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermal spray burner for use in repairing, spraying, dismantling, etc., a molten metal container and the like.

[0002]

2. Description of the Related Art In a thermal spray repair, for example, a powder material and a fuel gas are discharged from a thermal spray burner in the same direction, and the particles of the powder material are melted by a flame caused by the combustion of the fuel gas and adhered to a surface to be repaired to perform repair. Things.

[0003] Here, conventional techniques, for example, Japanese Utility Model 4-3
No. 7643 discloses a thermal spray burner 3 as shown in FIG.
In the central part of 3, the material holes are arranged so that the injection direction of the material holes intersects on the extension line 34 at the center of the burner, and the flame holes 32 are arranged in two or more concentric circles to concentrate the powder material. The purpose is to improve the performance and repair the damaged part efficiently.

However, according to this technique, when the amount of powder supplied per unit time of the powder material is increased, the material flow 35
The particles of the powder material therein become highly concentrated, and the powder material in the center of the material stream 35 far from the flame stream 36 is less susceptible to heat energy from the flame, so that the particles of the powder material have insufficient fusibility and can be melted as a result. The amount of powder supplied per unit time was limited.

[0005]

In the conventional thermal spray burner, the direction of injection of the powder material is arranged so as to intersect on the extension of the center of the burner, thereby improving the concentration of the powder material and efficiently repairing the damaged portion. However, in this technique, when the amount of powder supplied per unit time of the powder material is increased, the particles of the powder material in the material stream become high in concentration, and the powder material in the center of the material flow far from the flame stream becomes denser. The particles are less susceptible to heat energy from the flame, and the amount of powder that can be melted per unit time is limited.

The present invention increases the efficiency of thermal energy received by a powder material from a flame, and increases the amount of powder supplied per unit time at which particles of the powder material can be completely melted.
An object of the present invention is to provide a burner that improves the spraying performance per unit time.

[0007]

According to the burner of the present invention, the spraying performance per unit time is improved by changing the injection direction of the flame holes / material holes. In other words, the powder material injected from the material hole of the thermal spray burner collides with the flame to disperse and inject the particles of the powder material into the high-temperature flame near the burner injection surface, thereby reducing the particle amount of the powder material completely melted. By increasing the value, the spraying performance per unit time is improved.

[0008] Specifically, the material hole array 3 is replaced with the outer peripheral flame hole array 5.
In the thermal spray burner 1 arranged concentrically between the inner peripheral flame hole array 4 and the inner peripheral flame hole array 4, the spray directions 8, 9 of the respective flame holes of the flame hole arrays 5, 4 are directed to the burner center direction. The spraying directions 7 and 6 of the material holes adjacent to each other in the row 3 are arranged so as to face alternately in the outer flame hole row direction and the inner flame hole row direction. Since the particles are uniformly dispersed at a high concentration, the thermal energy of the flame can be transmitted to the particles of the powder material with high efficiency, and the spraying performance per unit time can be improved.

A thermal spray burner 11 in which a material hole row 13 is arranged between a first row of fire hole rows 15 and a second row of fire hole rows 16.
The injection direction 14 of the adjacent material holes of the material hole row 13
Are arranged so as to alternately face the direction of the first row of flame holes 15 and the second row of fire holes 16, wherein the particles of the powdered material have a high concentration in the flame. Because of uniform dispersion, the thermal energy of the flame can be transmitted to the particles of the powder material with high efficiency, and the spraying performance per unit time can be improved.

Further, in the thermal spray burner 21 in which the material hole array 23 is arranged between the first flame hole array 25 and the second flame hole array 26, each of the flame holes of the flame hole arrays 25 and 26 is provided. Extension lines 29 in which the injection directions 27 and 28 of each of the material holes of the material hole row 23 are perpendicular to the burner injection surface 22.
And the injection direction 24 of the material holes adjacent to the material hole row 23 is alternately directed to the direction of the first flame hole row 25 and the direction of the second flame hole row 26. A thermal spray burner characterized by being arranged in the same manner as described above, so that the heat energy of the flame can be transmitted to the particles of the powder material with high efficiency in order to uniformly disperse the particles of the powder material in the flame at a high concentration. The spraying ability can be improved.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. Embodiment 1 FIG. 1 shows a cross-sectional view (a) and a front view (b) of a first embodiment of the present invention. In FIG. 1, a thermal spray burner 3 for discharging a flame and a powder material has a material hole array 3 arranged concentrically between an outer flame hole array 5 and an inner flame hole array 4 on a burner injection surface 2. The injection directions 8, 9 of the respective flame holes of the rows 5, 4 are directed toward the center of the burner, and the injection directions 7, 6 of the adjacent material holes of the material hole row 3 correspond to the outer flame hole row 5 and the inner circumference. It has a structure arranged so as to face the flame hole row 4 alternately.

Injection direction 7 of adjacent material holes in material hole row 3,
The particles of the injected powder material collide with the flame in the collision portion 10 and are uniformly dispersed in the flame by arranging the particles 6 so as to alternately face the outer flame hole row 5 direction and the inner flame hole row 4 direction. Is done. Since the flame is hotter as it is closer to the burner injection surface 2, by setting this collision to a position closer to the burner injection surface 2, larger thermal energy can be transmitted to the particles of the powder material.

In this case, it is preferable that each material hole of the material hole row 3 is opposed to each flame hole of the flame hole rows 5 and 4 so that the powder material injected from the burner is included in the flame. The number of rows of material holes 3 and the number of rows of flame holes 5 and 6 are not necessarily required to be one. Even if the number of rows is large depending on the amount of combustion per hour and the amount of powder supplied, the injection direction as described above can be applied to the flame. A thermal spray burner having a flame hole and a material hole for uniformly dispersing the material can also be provided.

Further, it is better to bring the collision portion 10 closer to the burner injection surface 2 as described above. The injection direction of the flame holes and the material holes is determined by using the burner with respect to an extension line drawn from each of the flame holes of the flame hole arrays 5 and 6 so that the injection direction of the flame hole arrays 5 and 6 is perpendicular to the burner injection surface 2. An angle of 2 ° to 10 ° with respect to the center direction, and an extension line drawn from each material hole of the material hole array 3 so that the injection direction of the material hole adjacent to the material hole array 3 is perpendicular to the burner injection surface 2 On the other hand, the burner is directed alternately at an angle of 2 ° to 10 ° in the direction of the burner center and at an angle of 2 ° to 10 ° in the direction of the anti-burner center.
From 10 mm to 500 mm.

Further, when the flame temperature at the collision position is 2000
It is preferable that the temperature is not less than ° C in order to completely melt the particles of the powder material. However, when the values of the angle of the injection direction, the distance of the collision position, and the flame temperature cannot be obtained as described above, they may be appropriately determined in design.

As described above, the powder material injected at a position close to the burner injection surface 2 collides with the flame, and the particles of the powder material are uniformly dispersed in the flame at a high concentration. Since the particles can be transmitted to the particles of the powder material, the amount of particles of the powder material completely melted increases, and the spraying performance per unit time is improved.

[0017] A comparison was made between the sprayed articles using such a sprayed burner of the present invention and a conventional sprayed burner.
Using the spraying burners shown in Table 1, the amount of combustion per unit time, spraying distance, and spraying material were the same as shown in Table 2, and the amount of powder supplied per unit time was similarly varied. Tested.

As a result, as shown in the graphs of FIGS. 4 and 5, in the conventional thermal spray burner, if the amount of powder supplied per unit time increases, the yield of adherence of the work decreases, and the apparent appearance of the work appears. Although the porosity increases, the use of the thermal spray burner of the present invention results in no change in the adhesion yield and the apparent porosity of the construction body despite the increase in the amount of powder supplied per unit time. It was confirmed that the amount of powder supplied per unit time can be increased by 50% compared to the burner.

As described above, according to the present invention, the spraying performance per unit time can be improved. In addition, the extension of the flame hole and the material hole of the present invention does not necessarily need to have a crossing structure, and the extension of the flame hole and the extension of the material hole approach at the position of the twist outside the burner, A thermal spray burner having a flame hole and a material hole for obtaining the same effect by receiving the heat energy of the flame with high efficiency can also be provided. In this case, since the flame emerging from the spray burner has a certain thickness, it is better that the extension of the material hole passes through the inside of the flame as close as possible to the center.

Embodiment 2 FIG. 2 is an external view of a second embodiment of the present invention. In FIG. 2, a thermal spray burner 11 for discharging a flame and a powder material has a flame hole array 1 on a burner injection surface 12.
A material hole array 13 is arranged between 5 and another flame hole array 16;
There is a structure in which the injection direction 14 of the material holes adjacent to the material hole array 13 is alternately oriented in the direction of the first flame hole array 15 and the direction of the second flame hole array 16. doing.

Injection direction 1 of adjacent material holes in material hole row 13
4 are arranged so as to face alternately in the direction of the first row of flame holes 15 and in the direction of the second row of fire holes 16, so that the injected powder material collides with the flame and enters the flame. Dispersed uniformly.

Since the temperature of the flame is higher as the flame is closer to the burner injection surface 12, by setting this collision at a position closer to the burner injection surface 12, more heat energy can be transmitted to the powder material. In this case, the material hole array 13 is arranged so that the powder material injected from the burner is included in the flame.
Is preferably shorter than the length of the flame hole rows 15 and 16.

It is preferable that each material hole of the material hole row 13 is opposed to each flame hole of the flame hole rows 15 and 16.
The number of rows of material holes 13 and the number of rows of flame holes 15 and 16 are not necessarily required to be one. Even if the number of rows is large depending on the amount of combustion and the amount of powder supplied per unit time, the injection direction as described above may be used in the flame. A spraying burner having a flame hole and a material hole for uniformly dispersing the powder material into the material can also be used.

Further, it is better to bring the collision position closer to the burner injection surface 12 as described above. The injection direction of the flame holes and the material holes is determined by changing the injection direction of the flame hole rows 15 and 16 to the burner injection surface 1.
The direction of injection of the material hole array 13 is perpendicular to the burner injection surface 12 so that the material hole of the material hole array 13 is perpendicular to the burner injection surface 12. 2 ° in the direction of the flame hole row 15 with respect to the extension line drawn from
At an angle of -10 °, and 2 ° in the direction of another row of flame holes 16
It is directed alternately at an angle of 10 ° to 10 °, and the collision position at that time is 10 mm to 500 mm from the burner injection surface 12.

Further, the flame temperature at the collision position is 2000
It is preferable that the temperature is not less than ° C in order to completely melt the particles of the powder material. However, when the values of the angle of the injection direction, the distance of the collision position, and the flame temperature cannot be obtained as described above, they may be appropriately determined in design.

As described above, the powder material injected at a position close to the burner injection surface 12 collides with the flame so that the particles of the powder material are uniformly dispersed in the flame at a high concentration, so that the heat energy of the flame can be efficiently transferred. Can be transmitted to the particles of the powder material,
The amount of particles of the powder material completely melted is increased, and the spraying performance per unit is improved.

A comparison was made between the thermal spraying bodies using the thermal spray burner of the present invention and the conventional thermal spray burner.
Using the spraying burner shown in Table 1, the amount of combustion per unit time, spraying distance, and spraying material were set to the same conditions as shown in Table 2, and the amount of powder supplied per unit time was similarly changed. did.

As a result, as shown in the graphs of FIGS. 6 and 7, in the conventional thermal spray burner, if the amount of powder supplied per unit time increases, the adhesion yield of the construction body decreases, and the appearance of the construction body is reduced. Although the porosity increases, using the thermal spray burner of the present invention results in no change in the adhesion yield and apparent porosity of the construction body despite the increase in the amount of powder supplied per unit time. Thus, it was confirmed that the powder supply amount per hour can be increased by 28% as compared with the conventional burner. As described above, according to the present invention, the spraying performance per unit time can be improved.

Embodiment 3 FIG. 3 shows an external view of a third embodiment of the present invention. In FIG. 3, a spray burner 21 for discharging a flame and a powder material has a flame hole array 2 on a burner injection surface 22.
5 and another flame hole row 26, the material hole row 23 is arranged,
Injection direction 27 of each flame hole row of the flame hole rows 25 and 26,
28 is directed from each material hole of the material hole row 23 to an extension line 29 which is perpendicular to the burner injection surface 22,
In addition, the injection direction 24 of the material holes adjacent to the material hole array 23 is the direction of the first flame hole array 25 and the direction of the second flame hole array 26.
Are arranged alternately in the direction of.

Injection direction 2 of adjacent material holes in material hole row 23
4 are arranged so as to face alternately in the direction of the first row 25 of flame holes and the direction of the second row 26 of flame holes, so that the injected powder material collides with the flame and enters the flame. Dispersed uniformly.

Since the temperature of the flame is higher as the flame is closer to the burner injection surface 22, by setting this collision to a position closer to the burner injection surface 22, more heat energy can be transmitted to the powder material.

In this case, the length of the material hole array 23 is preferably shorter than the length of the flame hole arrays 25 and 26 so that the powder material injected from the burner is included in the flame. Further, each material hole of the material hole row 23 corresponds to the flame hole row 2.
It is preferable to face each of the flame holes 5 and 26. The number of rows of material holes 23 and the number of rows of flame holes 25 and 26 are not necessarily required to be one. Even if the number of rows is large depending on the amount of combustion and the amount of powder supplied per unit time, the above-described spraying direction in the flame is not considered. A spraying burner having a flame hole and a material hole for uniformly dispersing the powder material into the material can also be used.

Further, it is better to bring the collision position closer to the burner injection surface 22 as described above. The spray direction of the flame holes and the material holes is determined by the spray direction of the flame hole rows 25 and 26 in the burner spray surface 2.
2 with respect to an extension line drawn from each of the flame holes of the flame hole rows 25 and 26 so as to be perpendicular to
With respect to an extension line drawn from each material hole of the material hole array 23 so that the injection direction of the material holes adjacent to the material hole array 23 is perpendicular to the burner injection surface 22, the flame hole array 25 In the direction of 2 ° to 10 °, and alternately in the direction of another flame hole row 26 at an angle of 2 ° to 10 °, and the collision position at that time is 10 mm to 500 mm from the burner injection surface 12.
And

Further, the flame temperature at the collision position is 2000
It is preferable that the temperature is not less than ° C in order to completely melt the particles of the powder material. However, when the values of the angle of the injection direction, the distance of the collision position, and the flame temperature cannot be obtained as described above, they may be appropriately determined in design.

As described above, the powder material injected at a position close to the burner injection surface 22 collides with the flame to disperse the particles of the powder material uniformly in the flame at a high concentration, so that the heat energy of the flame can be efficiently transferred. Since the particles can be transmitted to the particles of the powder material powder, the amount of particles of the powder material completely melted increases, and the spraying performance per unit improves.

A comparison was made between the thermal spraying bodies using the thermal spray burner of the present invention and the conventional thermal spray burner.
Using the spraying burner shown in Table 1, the amount of combustion per unit time, spraying distance, and spraying material were set to the same conditions as shown in Table 2, and the amount of powder supplied per unit time was similarly changed. did.

As a result, as shown in the graphs of FIGS. 8 and 9, in the conventional thermal spray burner, if the amount of powder supplied per unit time increases, the adhesion yield of the construction body decreases, and the appearance of the construction body is reduced. Although the porosity increases, using the thermal spray burner of the present invention results in no change in the adhesion yield and apparent porosity of the construction body despite the increase in the amount of powder supplied per unit time. That is, it was confirmed that the powder supply amount per hour can be increased by 42% as compared with the conventional burner.

As described above, according to the present invention, the spraying performance per unit time can be improved. In the third embodiment, as compared with the second embodiment, the collision position between the flame and the material can be made closer to the burner injection surface, so that the effect of improving the spraying ability is large.

[0039]

[Table 1]

[0040]

[Table 2]

[0041]

According to the present invention, since the powder material can be uniformly dispersed at a high concentration in the flame, the thermal energy of the flame can be transferred to the particles of the powder material with high efficiency, and the particles of the powder material completely melted increase. In addition, the spraying performance per unit time is improved.

[Brief description of the drawings]

FIG. 1 is a view showing a first embodiment of a thermal spray burner according to the present invention, wherein (a) is a cross-sectional view and (b) is a front view.

FIG. 2 is an external view showing a second embodiment of a thermal spray burner according to the present invention.

FIG. 3 is an external view showing a third embodiment of a thermal spray burner according to the present invention.

FIG. 4 is a view showing a powder supply amount per unit time and an adhesion yield using a thermal spray burner according to the first embodiment and a conventional example.

FIG. 5 is a diagram showing a powder supply amount per unit time and an apparent porosity of a construction body using a sprayed burner according to the first embodiment and a conventional example.

FIG. 6 is a diagram showing a powder supply amount per unit time and an adhesion yield using a thermal spray burner according to the second embodiment and a conventional example.

FIG. 7 is a diagram showing a powder supply amount per unit time and an apparent porosity of a construction body using a sprayed burner according to the second embodiment and a conventional example.

FIG. 8 is a diagram showing a powder supply amount per unit time and an adhesion yield using a thermal spray burner according to the third embodiment and a conventional example.

FIG. 9 is a diagram showing a powder supply amount per unit time and an apparent porosity of a construction body using a thermal spray burner according to the third embodiment and a conventional example.

10A and 10B are views showing a conventional thermal spray burner, wherein FIG. 10A is a front view, and FIG. 10B is an explanatory sectional view of FIG.

[Explanation of symbols]

 1, 11, 21, 33 Thermal spray burner 4, 5, 15, 16, 25, 26, 32 Flame hole array 3, 13, 23, 31 Material hole array 8, 9, 27, 28 Injection direction of flame hole 6, 7 , 14, 24 Injection direction of material holes 2, 12, 22 Burner injection surface 10 Collision part 35 Material flow 36 Flame flow 29, 34 Extension

Claims (3)

(57) [Claims] 1. A thermal spray burner (1) in which a row of material holes (3) are arranged concentrically between a row of outer peripheral flame holes (5) and a row of inner peripheral flame holes (4). , (4), the injection directions (8), (9) of the respective flame holes are directed toward the center of the burner, and the injection directions (7), (6) of the adjacent material holes of the material hole row (3). ) Is a thermal spray burner characterized by being arranged alternately in the outer flame hole row direction and the inner flame hole row direction. 2. A thermal spray burner (11) having a material hole array (13) arranged between a first flame hole array (15) and a second flame hole array (16). The injection direction (14) of the adjacent material holes in (13) is the first flame hole row (1).
A thermal spray burner characterized by being arranged alternately in the direction of 5) and the direction of the second row of flame holes (16). 3. A thermal spray burner (21) in which a material hole array (23) is arranged between a first flame hole array (25) and a second flame hole array (26). Column (25),
The injection directions (27) and (28) of each flame hole of (26) are directed from the respective material holes of the material hole row (23) to an extension line (29) that is perpendicular to the burner injection surface (22). The injection direction (24) of the material holes adjacent to the material hole array (23) is the same as the direction of the first flame hole array (25) and the direction of the second flame hole array (26). A spray burner characterized by being arranged alternately in the direction.