JP7084662B2 - Powder production equipment - Google Patents

Description

The present invention relates to a powder manufacturing apparatus for obtaining powder by injecting a combustion flame into a raw material and pulverizing the raw material.

Conventionally, there is a powder manufacturing apparatus that injects a combustion flame into a raw material and pulverizes it to obtain a powder (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2016-204718

The powder manufacturing apparatus can, for example, inject a combustion flame around the flowing raw material to crush it to produce fine powder, but there is room for improvement in obtaining a powder having a uniform particle size. ..

An object of the present invention is to provide a powder manufacturing apparatus capable of obtaining a powder having a uniform particle size.

The powder manufacturing apparatus according to claim 1 includes a combustion flame generator that generates a combustion flame, an annular combustion chamber into which the combustion flame flows and the combustion flame flows in the circumferential direction, and a central portion of the combustion chamber. An annular injection port from which the combustion flame is ejected, a supply path forming member provided at the center of the injection port and having a supply path through which the raw material flows down, and a supply path forming member provided inside the injection port. The combustion flame is formed between the rectifying plate and the rectifying plate, and has a plurality of rectifying plates for ejecting the combustion flame flowing from the combustion chamber toward the central axis of the injection port. The widthwise center line of the combustion flame passage path through which the combustion flame passes is directed to the central axis of the injection port.

In the powder manufacturing apparatus according to claim 1, the combustion flame generated by the combustion flame generator flows into the annular combustion chamber, and the combustion flame flows in the circumferential direction inside the combustion chamber. The combustion flame flowing inside the combustion chamber is ejected to the outside through an injection port provided in the center of the combustion chamber.

Here, inside the injection port, a plurality of straightening vanes are provided to eject the combustion flame flowing from the combustion chamber toward the extension line of the central axis of the injection port. Therefore, the combustion flame passes between the straightening vane and the straightening vane and is ejected toward the central axis of the injection port.

Then, each combustion flame that has passed between the rectifying plates collides with each other on the central axis of the injection port. Therefore, when a raw material such as metal is made to flow down on the central axis via the supply path, each of the flowed raw materials Each combustion flame that has passed between the rectifying plates collides with each other through the injection port, and the raw material is heated and crushed.

Since the widthwise center line of the combustion flame passage path formed between the rectifying plate and the rectifying plate is directed to the central axis of the injection port, the combustion flame that has passed through the combustion flame passage path is the center of the injection port. It can be reliably injected toward the shaft. Since the combustion flame that has passed between the straightening vane and the straightening vane can be ejected so as to be concentrated toward the central axis of the injection port, the raw materials flowing down along the central axis have the same particle size. It can be efficiently crushed into a powder.

According to the powder manufacturing apparatus of the present invention, since the swirling of the combustion flame that hits the raw material can be suppressed, it is possible to obtain a powder having a uniform particle size, which is an excellent effect.

It is a vertical sectional view along the central axis which shows the powder manufacturing apparatus which concerns on a reference example. It is a horizontal sectional view which shows the powder manufacturing apparatus which concerns on a reference example. It is a top view of the combustion chamber which shows the arrangement of the rectifying plate. It is a top view of the combustion chamber which shows the arrangement of the rectifying plate of the powder manufacturing apparatus which concerns on other reference examples. It is a top view of the combustion chamber which shows the arrangement of the rectifying plate of the powder manufacturing apparatus which concerns on still another reference example. It is a horizontal sectional view which shows the powder manufacturing apparatus which concerns on another reference example which provided with 4 burners. It is a horizontal sectional view which shows the powder manufacturing apparatus which concerns on another reference example which provided with 6 burners. (A) is a cross-sectional view of a combustion chamber which shows arrangement of the rectifying plate of the powder manufacturing apparatus which concerns on embodiment, (B) is 8 (B) -8 (B) of the powder manufacturing apparatus shown in FIG. 8 (A). ) It is a cross-sectional view.

Hereinafter, the powder manufacturing apparatus 10 according to the reference example will be described with reference to the drawings.
As shown in FIGS. 1 and 2, the powder manufacturing apparatus 10 has a combustor main body 12 and a burner 22.

The combustor main body 12 has a small box shape and has a combustion chamber 16, a circular port 18, a mounting port 20, a burner 22, a rectifying plate 24, and a heat exchange means 26. The combustion chamber 16 is formed inside the combustor main body 12, and forms a disk-shaped space surrounded by a circular shape by the side wall 16a. Further, a center cone 14 is attached to the attachment port 20 of the combustor main body 12 by using a nut 21.

The circular port 18 is provided so as to penetrate the central portion of the lower inner wall 16b of the pair of upper and lower inner walls 16b and 16c of the combustion chamber 16. The circular port 18 has a circular shape and is formed in a tapered shape so that the diameter gradually decreases downward from the combustion chamber 16. The mounting port 20 is provided so as to penetrate the central portion of the other inner wall 16c on the upper side of the combustion chamber 16. The mounting port 20 has a circular shape and has a diameter larger than the diameter of the circular port 18.

As shown in FIG. 2, two burners 22 are attached to the combustor main body 12 and are arranged at positions rotationally symmetric with respect to the central axis CLb of the circular port 18.

The burner 22 is provided with an injection device 22B at one end of the cylinder 22A, which mixes and ejects fuel and air. As the fuel, for example, a flammable liquid fuel or gas such as kerosene, propane gas, or hydrogen is used. A combustion flame is jetted from the other end of the cylinder 22A toward the combustor main body 12.

The combustor main body 12 has a combustion path 28 for guiding the combustion flame ejected from the burner 22 to the inside of the combustion chamber 16 and a spark plug 30. The combustion chamber 28 is provided so as to extend straight from the outer wall of the combustor main body 12 to the combustion chamber 16 along the tangential direction of the side wall 16a of the combustion chamber 16. The spark plug 30 is provided on the side wall 16a of the combustion chamber 16 so as to ignite the air-fuel mixture ejected from the burner 22.

The burner 22 is configured to inject the air-fuel mixture toward the combustion path 28, and when the air-fuel mixture is ignited by the spark plug 30, inject a combustion flame toward the combustion chamber 16. The combustor main body 12 is configured such that the generated combustion flame rotates around the circular port 18 along the side wall 16a of the combustion chamber 16 inside the combustion chamber 16 (see arrow C in FIG. 2). The burner 22 can generate a reducing flame as a combustion flame.

As shown in FIGS. 1 and 3, a plurality of straightening vanes 24 extending in the radial direction are formed at equal intervals in the circumferential direction on the upper surface of the inner wall 16b of the combustion chamber 16. The straightening vane 24 is formed in a substantially triangular shape elongated in the radial direction in a plan view shape, and is provided so as to stand up upward.

As shown in FIG. 3, a combustion flame passage path 32 having a constant width is formed between the straightening vane 24 and the straightening vane 24. In this reference example, the widthwise center line CL of the combustion flame passage 32 intersects the center axis CLb of the circular opening 18.

The length dimension of the rectifying plate 24 (the dimension along the radial direction of the circular port 18) is set longer than the height dimension of the rectifying plate 24, and the length dimension of the combustion flame passage path 32 is the combustion. It is set longer than the width dimension and the height dimension of the flame passage 32.

As shown in FIG. 1, the heat exchange means 26 heats the heat exchange chambers 26a, 26b, 26c provided around the combustion chamber 16 and the heat exchange chambers 26a, 26b, 26c for circulating the heat exchange medium. It has an exchange circulation device (not shown). The heat exchange means 26 circulates a heat exchange medium such as water in the heat exchange chambers 26a, 26b, 26c by a heat exchange circulation device to exchange heat between the combustion chamber 16 and the heat exchange medium and burn the heat. The chamber 16 is configured to be coolable.

The center cone 14 is provided so as to extend from the attachment port 20 on the upstream side of the circular port 18 toward the inside of the circular port 18, and is tapered so that the outer diameter gradually decreases toward the circular port 18 inside the combustion chamber 16. It is formed in a shape. The tip of the center cone 14 is arranged inside the circular opening 18 at a distance from the circular opening 18. As a result, an annular frame jet injection port 13 is formed in which the edge of the circular port 18 forms the outer edge and the outer wall of the tip of the center cone 14 forms the inner edge. The central axis of the frame jet injection port 13 is the same as the central axis CLb of the circular port 18.

The center cone 14 has a supply path 14a having a circular cross section and an annular cooling portion 14b. The supply path 14a is provided so as to penetrate along the central axis of the center cone 14, and the opening at the tip thereof forms the supply port 14c. The supply path 14a is passed through a liquid, wire or powder metal or non-metal raw material M such as a molten metal, a metal wire, a metal powder, or a liquid raw material containing a molten raw material of glass, and is passed through the supply port 14c. It is configured to supply inside the frame jet injection port 13. The cooling unit 14b is provided around the supply path 14a from the vicinity of the attachment port 20 of the burner 22, and is configured to be able to cool the center cone 14 by circulating a liquid or gas cooling medium through the cooling unit 14b.

In the powder manufacturing apparatus 10, the combustion flame generated by the burner 22 rotates around the circular port 18 inside the combustion chamber 16 to adjust the flow, and then the frame jet FJ is sent from the annular frame jet injection port 13. It is configured to inject. Further, the annular frame jet FJ injected from the frame jet injection port 13 is configured to collide with the outer periphery of the metal or non-metal raw material supplied from the supply port 14c at a substantially uniform speed and pressure. In the powder manufacturing apparatus 10, a thermal barrier coating (not shown) is applied to the inner wall of the combustion chamber 16 of the combustor main body 12 and the inner outer wall of the combustion chamber 16 of the center cone 14.

(Action, effect)
Next, the operation and effect of the powder manufacturing apparatus 10 according to the reference example will be described.
(1) When the combustion flame is injected from the burner 22, the combustion flame flows into the inside of the annular combustion chamber 16 through the combustion path 28.
(2) As shown in FIG. 2, the combustion flame flowing into the inside of the combustion chamber 16 orbits the inside of the combustion chamber 16 in the direction of arrow C, and is uniformized in the circumferential direction inside the combustion chamber 16. Then, as shown by the arrow D in FIG. 3, the combustion flame inside the combustion chamber 16 passes through each combustion flame passage path 32, and then is a high-temperature, high-speed frame jet toward the central axis CLb of the circular port 18. It is injected as FJ and collides on the central axis CLb. In this reference example, the width direction center line CL of the combustion flame passage path 32 and the width direction center line CLj of the frame jet FJ injected from the combustion flame passage path 32 coincide with each other.

(3) In a state where the frame jet FJ is injected from the frame jet injection port 13, for example, a molten metal M (shown by a one-point chain line in FIG. 1) flows down from the supply port 14c along the central axis CLb to supply the molten metal M. A high-temperature, high-speed frame jet FJ collides with the outer periphery of the molten metal M flowing down from the mouth 14c, and the molten metal M is crushed into fine metal powder. In the powder manufacturing apparatus 10 of this reference example, by adjusting the fuel and air supply amounts of the burner 22, the frame is sent from the frame jet injection port 13 at a speed faster than the speed of sound (for example, Mach 3 to 5). The jet FJ can be injected. The molten metal M can be supplied from, for example, a crucible 34 provided above the center cone 14.

In this reference example, since the frame jet FJ having a high temperature (a temperature higher than the melting point of the molten metal M) collides with the molten metal M, the molten metal M becomes higher in temperature and has a higher viscosity than before the flame jet FJ collides. Since it is lowered, it is easily crushed and easily miniaturized.

By the way, when the center line CLj in the width direction of the frame jet FJ is deviated from the central axis CLb of the circular port 18, the frame jet FJ is ejected in the direction deviated from the central axis CLb, and the injected frame jet FJ is the molten metal M. In other words, it may turn around the central axis CLb.

If the frame jet FJ that collides with the molten metal M swirls around the molten metal M, the pulverization performance of the molten metal M deteriorates as compared with the case where the frame jet FJ does not swivel, and it becomes difficult to miniaturize the molten metal M. In addition, problems such as large variations in the particle size of the obtained metal powder are likely to occur.

In the powder manufacturing apparatus 10 according to the reference example, the length dimension of the rectifying plate 24 is set to be longer than the height dimension of the rectifying plate 24, so that the length dimension of the combustion flame passage path 32 is set to be longer than the height dimension of the combustion flame passage path 32. Since the width dimension and the height dimension are set longer than the width dimension and the height dimension, and the length of the combustion flame passage path 32 through which the combustion flame passes is sufficiently long, the length dimension of the combustion flame passage path 32 is the combustion flame. Compared with the case where it is set shorter than the height dimension of the passage 32, the rectifying effect of the combustion flame by the rectifying plate 24 is enhanced, and the combustion flame ejected from the combustion flame passage 32 is centered on the circular port 18. It can be reliably oriented to the axis CLb.

The combustion flame that has passed through each combustion flame passage 32 is injected from the annular frame jet injection port 13 as an annular frame jet FJ, and the annular frame jet FJ is the central axis CLb of the circular port 18. It is jetted toward. Therefore, when viewed from one end side of the central axis CLb of the circular port 18, the frame jet FJ is injected at a right angle to the outer peripheral surface of the molten metal M flowing down from the circular supply port 14c, and the frame jet FJ flows down. Rotation around the metal M is reliably suppressed.

By suppressing the rotation of the frame jet FJ in this way, the crushing ability of the molten metal M can be improved as compared with the case where the frame jet FJ is rotated, and further, the fineness and the particle size can be improved. It is possible to efficiently obtain a uniform metal powder.

In addition, the powder manufacturing apparatus 10 according to the reference example is under negative pressure by the annular frame jet FJ injecting from the supply port 12c arranged inside the annular frame jet injection port 13 from the frame jet injection port 13. Raw materials can be supplied along the axis. Further, by burning the fuel with a small amount of oxygen, the combustion flame can be made into a reducing flame, which makes it possible to suppress the oxidation of the metal powder.

The powder manufacturing apparatus 10 according to the reference example can also be used as a glass powder manufacturing apparatus and a metal spraying apparatus. When the powder manufacturing apparatus 10 is used as an atomizing apparatus, a metal wire is used as a raw material, and the metal wire is melted while being melted by injecting a high-temperature annular frame jet FJ onto the metal wire. Metal can also be crushed.

By statically supercooling the molten metal thus pulverized while falling or scattering in the atmosphere to make it amorphous, a spherical and fine amorphous metal powder can be obtained.

Further, a nozzle 36 for ejecting a liquid cooling medium such as water in a straight shape, a shower shape, or a mist shape is provided below the frame jet injection port 13, and the metal powder crushed by the frame jet FJ is discharged into the liquid cooling medium. You may try to quench it with. This makes it possible to obtain an amorphous metal powder more efficiently and reliably than by air cooling.

[Other reference examples]
Although the reference example has been described above, it is needless to say that various modifications other than the above can be carried out within a range not deviating from the purpose.

In the above reference example, as shown in FIG. 3, the widthwise center line CL of the combustion flame passage 32 intersects the central axis CLb of the circular port 18, but as shown in FIG. 4, the combustion flame passage 32 If the frame jet FJ jetted from is jetted toward the central axis CLb, the widthwise center line CLj of the frame jet FJ intersects the central axis CLb, and the frame jet FJ does not rotate, the combustion flame passage path 32 The widthwise center line CL may be slightly deviated from the central axis CLb (in other words, the direction of the combustion flame passage path 32 may be slightly deviated from the central axis CLb).

In the above reference example, the width of the combustion flame passage 32 is constant, but for example, the width may be gradually narrowed toward the frame jet injection port 13.
Further, in the above reference example, as shown in FIGS. 3 and 4, the combustion flame passage path 32 extends in a straight line, but as shown in FIG. 5, the inside of the combustion chamber 16 is swiveled in the direction of arrow C. A part of the combustion flame passage 32 may be curved in the direction opposite to the turning direction (arrow C direction) of the combustion flame so that the combustion flame can easily enter the combustion flame passage 32.

In the powder manufacturing apparatus 10 of the above reference example, two burners 22 are provided in the combustor main body, but the number of burners 22 may be one or three or more. As an example, FIG. 6 shows a combustor body 12 with four burners 22, and FIG. 7 shows a combustor body 12 with four burners 22.

[Embodiment]
In the powder manufacturing apparatus 10 of the above reference example, a plurality of rectifying plates 24 extending in the radial direction were formed on the upper surface of the inner wall 16b of the combustion chamber 16 at regular intervals in the circumferential direction. ), In the powder manufacturing apparatus 10 of the embodiment shown in (B), a plurality of rectifying plates 38 extending in the radial direction are formed at equal intervals in the circumferential direction on the inner peripheral surface of the circular port 18. Although not shown, a plurality of straightening vanes extending in the radial direction may be formed on the outer peripheral surface of the center cone 14 at a constant angle in the circumferential direction at equal intervals.

In the powder manufacturing apparatus 10 of the present embodiment, the center line CL in the width direction of the combustion flame passage path 40 formed between the rectifying plate 38 and the rectifying plate 38 is directed toward the central axis CLb of the circular port 18, and the central axis CLb. Crosses with. Therefore, the combustion flame that has passed through the combustion flame passage path 40 is injected as a frame jet FJ from the lower end of the frame jet injection port 13, and the frame jet FJ is injected toward the central axis CLb of the circular port 18. Therefore, when viewed from one end side of the central axis CLb of the circular port 18, the frame jet FJ is jetted at a right angle to the outer peripheral surface of the molten metal M flowing down from the circular supply port 14c, and the powder according to the above-mentioned reference example. Similar to the manufacturing apparatus 10, the frame jet FJ is surely suppressed from rotating around the molten metal M flowing down.

Therefore, also in the powder manufacturing apparatus 10 of the present embodiment, by suppressing the rotation of the frame jet FJ, the crushing ability of the molten metal M can be improved as compared with the case where the frame jet FJ rotates, and further. Can efficiently obtain a metal powder having a fine and uniform particle size.

10 Powder production equipment 13 Frame jet injection port (injection port)
14 Center cone (supply path forming member)
14a Supply path 16 Combustion chamber 22 Burner (combustion flame generator)
32 Combustion flame passage path 38 Rectifying plate 40 Combustion flame passage path M Molten metal (raw material)
FJ frame jet CL width direction center line CLb center axis

Claims (1)

A combustion flame generator that generates a combustion flame,
An annular combustion chamber into which the combustion flame flows and the combustion flame flows in the circumferential direction,
An annular injection port provided in the center of the combustion chamber and from which the combustion flame is ejected,
A supply path forming member provided in the center of the injection port and formed with a supply path through which the raw material flows down, and a supply path forming member.
A plurality of straightening vanes provided inside the injection port and ejecting the combustion flame flowing from the combustion chamber toward the central axis of the injection port.
Have,
The widthwise center line of the combustion flame passage path formed between the straightening vane and the burning flame passing through is directed to the central axis of the injection port.
Powder production equipment.

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