Centrifugal atomization powder equipment

Abstract

The invention discloses a centrifugal atomization powder equipment, which includes an atomization chamber, a centrifugal atomizer, a guide pipe, an inert gas circulation loop, and a high-temperature air chamber and a low-temperature air chamber that are not connected to each other. A working chamber is formed in the atomization chamber; the centrifugal atomizer is arranged in the working chamber; the guide pipe extends into the atomization chamber and is located at the top of the centrifugal atomizer, the low-temperature air chamber is arranged around the periphery of the high-temperature air chamber, the bottom wall of the high-temperature air chamber is provided with a first air outlet connected to the working chamber, and the low-temperature air chamber is provided with a second air outlet connected to the working chamber; two return air branches are arranged in parallel, and heat exchangers are arranged on the two return air branches and are respectively connected to the high-temperature air chamber and the low-temperature air chamber. The invention recycles and reuses the inert gas through the inert gas circulation loop, and the inert gas forms two air flows of different temperatures at the first air outlet and the second air outlet, thereby reducing the cooling energy consumption of the inert gas, and controlling the air flow organization and temperature distribution of the working chamber, thereby improving the sphericity of the powder and avoiding the formation of dust and satellite balls.

Description

Technical Field

[0001] The invention relates to the technical field of preparation of metal powder for additive manufacturing, and in particular to a centrifugal atomization powder equipment. Background Art

[0002] Spherical metal powder is an important raw material for contemporary microelectronics, semiconductor packaging and additive manufacturing. Among them, the centrifugal atomization process of metal powder has the process characteristics of concentrated powder particle size distribution and almost no hollow balls. It has achieved remarkable results in the atomization of low-temperature alloys and has also shown great potential advantages in the production of metal powder raw materials for additive manufacturing. In order to meet the cooling needs and powder collection needs of centrifugal atomized metal droplets, it is usually adopted to directly introduce return air or fresh air at the top of the atomization chamber, but this method is prone to unreasonable airflow organization, thereby reducing the sphericity of the powder, causing powder dust, and then leading to an increase in satellite balls, and easily increasing the energy consumption of equipment operation.

[0003] Therefore, it is necessary to provide a new centrifugal atomization powder equipment to solve the above technical problems. Summary of the invention

[0004] The main purpose of the present invention is to provide a centrifugal atomization powder equipment, aiming to solve the problems of low powder sphericity and powder dust caused by unreasonable airflow organization in the atomization chamber, which leads to an increase in satellite balls; and easily increases the energy consumption of equipment operation.

[0005] To achieve the above-mentioned purpose, the centrifugal atomization powder equipment proposed in the present invention includes an atomization chamber, a centrifugal atomizer, a guide tube, an inert gas circulation loop, and a high-temperature gas chamber and a low-temperature gas chamber that are not connected to each other, wherein a working chamber is formed in the atomization chamber; the centrifugal atomizer is arranged in the working chamber; one end of the guide tube extends into the atomization chamber and is located at the top of the centrifugal atomizer, and the other end of the guide tube is used to input molten metal; the high-temperature gas chamber and the low-temperature gas chamber are both arranged at the top of the working chamber, and the low-temperature gas chamber is arranged around the periphery of the high-temperature gas chamber, and the The bottom wall of the high-temperature air chamber is provided with a first air outlet connected to the working chamber, and the low-temperature air chamber is provided with a second air outlet connected to the working chamber; the inert gas circulation loop includes two return air branches and a separator, a dust collector, an induced draft fan and a return air fan connected in series in sequence, the air inlet end of the separator is connected to the working chamber, the two return air branches are arranged in parallel and are both connected to the air outlet end of the return air fan, and heat exchangers are arranged on the two return air branches, and one return air branch is connected to the high-temperature air chamber, and the other return air branch is connected to the low-temperature air chamber.

[0006] Optionally, the centrifugal atomization powder equipment includes a guide plate and an adjustment mechanism, the adjustment mechanism is arranged in the low-temperature air chamber, the guide plate is arranged at the second air outlet and connected to the output end of the adjustment mechanism, and the adjustment mechanism is used to push the guide plate to tilt so as to separate the second air outlet into two air flow channels; wherein, one of the air flow channels forms a low-temperature inert gas airflow toward the central axis of the working chamber, and the other air flow channel forms a low-temperature inert gas airflow toward the peripheral wall of the working chamber.

[0007] Optionally, the inclination angle between the guide plate and the vertical direction is -30° to 30°; the length of the guide plate extending out of the second air outlet is a, and the distance between the high-temperature air chamber and the centrifugal atomizer is b, wherein a≤b / 2.

[0008] Optionally, the edge of the second air outlet forms a baffle extending in a vertical direction, and the extension length of the baffle is smaller than the protruding length of the guide plate.

[0009] Optionally, the number of the second air outlet holes is at least two, and the at least two second air outlet holes are arranged at intervals along the circumference of the working chamber.

[0010] Optionally, the outer diameter of the high temperature gas chamber is R 1 , the radius of the centrifugal atomizer is R 2 , of which 10R 2 ≤R 1 ≤50R 2 .

[0011] Optionally, there are multiple first air outlet holes, and the multiple first air outlet holes form at least two layers of air outlet hole groups, and the at least two layers of air outlet hole groups are radially spaced along the high-temperature air chamber, and the multiple first air outlet holes in the same air outlet hole group are circumferentially spaced along the high-temperature air chamber.

[0012] Optionally, the first air outlet hole is a circular hole, and the diameter of the first air outlet hole in the outer layer is larger than the diameter of the first air outlet hole in the inner layer; or,

[0013] The first air outlet is in the shape of an annular groove, and the corresponding central angle of the first air outlet is β, which is between 10°≤β≤60°; the opening width of the first air outlet along the radial direction is b, which is between 5mm≤b≤50mm.

[0014] Optionally, the heat exchanger arranged on the return air branch includes a heat exchange chamber and a heat exchange channel passing through the heat exchange chamber and not connected to the heat exchange chamber, and the heat exchange channels are multiple, and the multiple heat exchange channels are arranged in parallel and connected to the return air branch.

[0015] Optionally, the inert gas circulation loop also includes an oxygen content detector and an air supply pipe, the oxygen content detector is arranged between the induced draft fan and the return air fan, one end of the air supply pipe is connected between the oxygen content detector and the return air branch, and the other end of the air supply pipe is used to input external inert gas.

[0016] In the technical solution of the present invention, the smelted metal melt is drained by the guide pipe and falls on the surface of the centrifugal atomizer; the centrifugal atomizer atomizes the metal melt to form a large number of tiny atomized droplets, and the droplets complete spheroidization and solidification into powder during the flight inside the working chamber; the induced draft fan provides suction force, and a part of the powder enters the cyclone separator with the inert gas. After the separator separates the inert gas and the large-particle powder, the inert gas and the tiny particles enter the dust collector; after the dust collector removes the tiny particle powder, the inert gas is discharged from the outlet of the dust collector, passes through the induced draft fan, and then passes through the return fan again. The return fan is used to pressurize the recycled inert gas. The inert gas after pressurization is divided into two return air branches. The gas in one return air branch is supplied to the high-temperature air chamber after heat exchange in the heat exchanger, and the gas in the other return air branch is supplied to the low-temperature air chamber after heat exchange in the heat exchanger; the inert gas in the high-temperature air chamber forms a high-temperature inert gas flow through the first air outlet, adjusts the air flow organization and temperature in the area where the centrifugal atomizer is located, and ensures that the powder is fully spheroidized. The required inert gas temperature is relatively high, ensuring that the air flow in the area where the centrifugal atomizer is located is in a laminar state, reducing the level of droplet fusion; the inert gas in the low-temperature air chamber forms a low-temperature inert gas flow through the second air outlet, which can meet the cooling requirements of the atomized droplets, and ensure that the atomized droplets do not erode the inner wall surface of the atomization chamber to prevent dust. The centrifugal atomization powder equipment in this application recovers the inert gas by setting an inert gas circulation loop, effectively reuses the inert gas, and avoids the waste of inert gas. After heat exchange, the recovered inert gas enters the low-temperature air chamber and the high-temperature air chamber at the top of the working chamber respectively. The high-temperature and low-temperature return air design also reduces the cooling energy consumption of the return air and the energy consumption of the equipment operation. The inert gas in the high-temperature air chamber and the low-temperature air chamber forms two air flows with different temperatures through the first air outlet and the second air outlet, and controls the air flow organization and temperature distribution of the working chamber, thereby avoiding dust and the formation of satellite balls, ensuring that the atomized droplets are fully spheroidized, and improving the sphericity of the powder. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0018] Figure 1 This is a schematic structural diagram of a centrifugal atomization powder equipment in an embodiment of the present invention;

[0019] Figure 2 A schematic diagram of the distribution of first air outlets in one embodiment of the present invention;

[0020] Figure 3 A schematic diagram of the distribution of first air outlets in another embodiment of the present invention;

[0021] Figure 4 is a schematic diagram of the distribution of the second air outlet holes in an embodiment of the present invention;

[0022] Figure 5 Schematic diagram of the position of the second air outlet and the guide plate in an embodiment of the present invention;

[0023] Figure 6 This is a schematic diagram of the structure of a heat exchanger in one embodiment of the present invention;

[0024] Figure 7 Schematic diagram of the structure of a heat exchanger in another embodiment of the present invention.

[0025] Description of Figure Numbers:

[0026] Label name Label name 100 Centrifugal atomization powder equipment 53 Induced draft fan 1 Spray chamber 54 Oxygen content detector 11 Working chamber 55 Air supply tube 2 Centrifugal Atomizer 56 Return fan 3 Flow guide tube 57 Air supply control valve 41 High temperature air chamber 58 Exhaust valve 411 First vent 6 Return air branch 42 Low temperature chamber 61 Heat Exchanger 421 Second vent hole 611 Heat exchange room 422 Bezel 612 Heat exchange channel 5 Inert gas circulation loop 71 Deflector 51 Separator 72 Adjustment mechanism 52 dust collector

[0027] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0030] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0031] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0033] like Figures 1 to 7 As shown, in one embodiment of the present invention, the centrifugal atomization powder equipment 100 includes an atomization chamber 1, a centrifugal atomizer 2, a guide tube 3, an inert gas circulation loop 5, and a high-temperature gas chamber 41 and a low-temperature gas chamber 42 that are not connected to each other. A working chamber 11 is formed in the atomization chamber 1; the centrifugal atomizer 2 is arranged in the working chamber 11; one end of the guide tube 3 extends into the atomization chamber 1 and is located at the top of the centrifugal atomizer 2, and the other end of the guide tube 3 is used to input metal melt; the high-temperature gas chamber 41 and the low-temperature gas chamber 42 are both arranged at the top of the working chamber 11, and the low-temperature gas chamber 42 is arranged around the periphery of the high-temperature gas chamber 41, and the high-temperature gas chamber 41 A first air outlet 411 communicating with the working chamber 11 is provided on the bottom wall, and a second air outlet 421 communicating with the working chamber 11 is provided on the low-temperature air chamber 42; the inert gas circulation loop 5 includes two return air branches 6 and a separator 51, a dust collector 52, an induced draft fan 53 and a return air fan 56 connected in series in sequence, the air inlet end of the separator 51 is connected with the working chamber 11, the two return air branches 6 are arranged in parallel and are both connected with the air outlet end of the return air fan 56, and heat exchangers 61 are provided on the two return air branches 6, and one return air branch 6 is connected with the high-temperature air chamber 41, and the other return air branch 6 is connected with the low-temperature air chamber 42.

[0034] In the above embodiment, the smelted metal melt is drained by the guide pipe 3 and falls on the surface of the centrifugal atomizer 2; the centrifugal atomizer 2 atomizes the metal melt to form a large number of tiny atomized droplets, and the droplets are spheroidized and solidified into powder during the flight inside the working chamber 11; the induced draft fan 53 provides suction force, and a part of the powder enters the cyclone separator 51 with the inert gas. After the separator 51 separates the inert gas and the large particle powder, the inert gas and the tiny particles enter the dust collector 52; after the dust collector 52 removes the tiny particle powder, the inert gas is discharged from the outlet of the dust collector 52, passes through the induced draft fan 53, and then passes through the return fan 56 again. The return fan 56 is used to pressurize the recycled inert gas. The gas is divided into two return air branches 6, and the gas in one return air branch 6 is supplied to the high-temperature air chamber 41 after heat exchange in the heat exchanger 61, and the gas in the other return air branch 6 is supplied to the low-temperature air chamber 42 after heat exchange in the heat exchanger 61; the inert gas in the high-temperature air chamber 41 forms a high-temperature inert gas flow through the first air outlet 411, adjusts the air flow organization and temperature in the area where the centrifugal atomizer 2 is located, ensures that the powder is fully spheroidized, and the required inert gas temperature is relatively high, ensures that the air flow in the area where the centrifugal atomizer 2 is located is in a laminar state, and reduces the level of droplet fusion; the inert gas in the low-temperature air chamber 42 forms a low-temperature inert gas flow through the second air outlet 421, which can meet the cooling requirements of the atomized droplets, and ensure that the atomized droplets do not erode the inner wall surface of the atomization chamber 1 to prevent dust.

[0035] The centrifugal atomization powder equipment 100 in the present application sets a low-temperature air chamber 42 and a high-temperature air chamber 41 at the top of the working chamber 11. The inert gas circulation loop 5 recycles the inert gas and enters the low-temperature air chamber 42 and the high-temperature air chamber 41 after heat exchange, effectively reusing the inert gas and avoiding the waste of the inert gas. The high and low temperature return air design also reduces the cooling energy consumption of the return air and reduces the energy consumption of the equipment operation. Two air flows with different temperatures are formed through the first air outlet 411 and the second air outlet 421 to control the air flow organization and temperature distribution of the working chamber 11, thereby avoiding the formation of dust and satellite balls, ensuring that the atomized droplets are fully spherical, and improving the sphericity of the powder. In addition, an inert gas circulation loop 5 is set to recycle the inert gas, effectively reusing the inert gas and avoiding the waste of the inert gas.

[0036] Among them, the separator 51 can be a cyclone separator 51, and the cyclone separator 51 can use a primary cyclone or a secondary cyclone to meet different working requirements. The centrifugal atomizer 2 is arranged on the central axis of the working chamber 11, and correspondingly, the cross section of the high-temperature air chamber 41 is annular, and the hollow part of the high-temperature air chamber 41 is for the guide tube 3 to pass through, and the cross section of the low-temperature air chamber 42 is annular, and the low-temperature air chamber 42 is arranged on the periphery of the high-temperature air chamber 41. The use of high-temperature air chambers 41 and low-temperature air chambers 42 with regular shapes can more effectively control the airflow organization in the working chamber 11, and can make full use of the top area of ​​the working chamber 11. And a pressure regulating valve can be set on the return air branch 6 to further adjust the air supply flow and pressure to the high-temperature air chamber 41 and the low-temperature air chamber 42 respectively.

[0037] In one embodiment, the centrifugal atomization powder equipment 100 includes a guide plate 71 and an adjustment mechanism 72, the adjustment mechanism 72 is arranged in the low-temperature gas chamber 42, the guide plate 71 is arranged at the second gas outlet 421 and connected to the output end of the adjustment mechanism 72, and the adjustment mechanism 72 is used to push the guide plate 71 to tilt so as to separate the second gas outlet 421 into two air flow channels; wherein one air flow channel forms a low-temperature inert gas air flow toward the central axis of the working chamber 11, and the other air flow channel forms a low-temperature inert gas air flow toward the peripheral wall of the working chamber 11. The guide plate 71 separates the second gas outlet 421 into two air flow channels, thereby dividing the air flow at the second gas outlet 421 into two streams, one of which is an inert gas that converges on the central axis of the atomization chamber 1 to meet the requirement of solidification of the atomized melt into powder, and the other is an inert gas that rushes toward the inner wall surface of the atomization chamber 1 to prevent the unsolidified atomized droplets from adhering to the inner wall of the atomization chamber 1 and causing damage to the inner wall surface of the atomization chamber 1. And according to the type of centrifugal atomization alloy and the atomization production efficiency, the inclination angle of the guide plate 71 (the angle between the guide plate 71 and the vertical direction) can be adjusted by the adjustment mechanism 72 to change the flow rate and the airflow angle of the above two airflows.

[0038] Specifically, two pivots are formed at both ends of the guide plate 71, and two mounting arms are provided on the inner wall of the low-temperature air chamber 42. The two pivots are rotatably connected to the two mounting arms. The adjustment mechanism 72 is a cylinder, and the cylinder body of the cylinder is rotatably connected to the inner wall of the low-temperature air chamber 42. The output shaft of the cylinder is rotatably connected to the guide plate 71, and the output shaft of the cylinder extends or retracts to push the guide plate 71 to tilt. Alternatively, the adjustment mechanism 72 includes a driving cylinder and a connecting rod mechanism, and one of the connecting rods of the connecting rod mechanism can achieve a tilting action, and the guide plate 71 is fixed to the connecting rod. The present application does not limit the specific connection method between the adjustment mechanism 72 and the guide plate 71, and it is only necessary for the adjustment mechanism 72 to provide power to cause the guide plate 71 to tilt.

[0039] Based on the above embodiment, the inclination angle between the guide plate 71 and the vertical direction is -30° to 30°; the length of the guide plate 71 extending from the second air outlet 421 is a, and the distance between the high-temperature gas chamber 41 and the centrifugal atomizer 2 is b, wherein a≤b / 2. Since the working chamber 11 is an inverted cone structure, by controlling the inclination angle and the extension length of the guide plate 71, the inert gas flow is prevented from being perpendicular or at an acute angle to the inner wall of the working chamber 11, so that the inert gas flow can form a protective gas flow obliquely downward along the inner wall of the working chamber 11, rather than forming a chaotic gas flow after colliding with the inner wall of the working chamber 11. Similarly, the air flow chaos caused by the excessive angle between the air flow formed by the second air outlet 421 and the air flow formed by the first air outlet 411 can be avoided, thereby preventing dust and controlling the air flow organization in the working chamber 11. And avoid the guide plate 71 extending too long, resulting in the inability to provide a low-temperature inert gas flow for the upper section of the molten droplet flight.

[0040] In one embodiment, please refer to Figure 4 and Figure 5 , the edge of the second air outlet 421 forms a baffle 422 extending in the vertical direction, and the extension length of the baffle 422 is less than the extension length of the guide plate 71. By setting the baffle 422, two air flow channels are formed between the baffle 422 and the guide plate 71, respectively, which can more effectively guide the air flow to quickly cool the atomized droplets and prevent the unsolidified droplets from adhering to the inner wall of the atomization chamber 1. The angle between the outlet baffle 422 and the vertical direction is between -30° and 30°; the length of the outlet baffle 422 does not exceed 1 / 4 of the distance between the high-temperature air chamber 41 and the centrifugal atomizer 2.

[0041] In one embodiment, the number of the second air outlet holes 421 is at least two, and at least two second air outlet holes 421 are arranged at intervals along the circumference of the working chamber 11. That is, the second air outlet holes 421 are evenly spaced along the circumference to form a protective air flow on the inner wall surface of the entire working chamber 11. The second air outlet holes 421 are in the shape of an annular groove; the central angle α corresponding to the second air outlet holes 421 does not exceed 150°, and the number of the second air outlet holes 421 does not exceed the maximum integer of 300° / α, thereby ensuring that the groove length of the second air outlet holes 421 and the spacing distance between two adjacent second air outlet holes 421 match, thereby ensuring the structural strength of the bottom wall of the low-temperature air chamber 42.

[0042] In one embodiment, please refer to Figure 2 and Figure 3 , the outer diameter of the high temperature chamber 41 is R1, the radius of the centrifugal atomizer 2 is R2, wherein 10R2≤R1≤50R2. The centrifugal atomizer 2 generates atomized droplets by centrifugation, and by controlling the outer diameter of the high temperature chamber 41, that is, controlling the high temperature inert gas flow to effectively cover the droplet generation area, thereby ensuring that the temperature of the droplet area can fully spheroidize the droplets, thereby ensuring the quality of the spherical metal powder.

[0043] Optionally, there are multiple first air outlet holes 411, and the multiple first air outlet holes 411 form at least two layers of air outlet hole groups, and the at least two layers of air outlet hole groups are arranged at intervals along the radial direction of the high-temperature air chamber 41, and the multiple first air outlet holes 411 in the same air outlet hole group are arranged at intervals along the circumferential direction of the high-temperature air chamber 41. By evenly distributing the first air outlet holes 411 on the bottom wall of the high-temperature air chamber 41, the airflow formed in the area where the molten droplets are generated presents a unidirectional laminar flow, ensuring that the atomized molten droplets are fully spheroidized while preventing collision and fusion between the atomized molten droplets due to airflow chaos, thereby preventing the increase of the powder particle size.

[0044] Please refer to Figure 2 The first air outlet holes 411 may be circular holes, the diameter of the first air outlet holes 411 of the outer layer is larger than the diameter of the first air outlet holes 411 of the inner layer; the diameter of the first air outlet holes 411 is not less than 5 mm, the distance between two adjacent layers of first air outlet holes 411 (the minimum radial distance) is not less than the sum of the radii of the two adjacent layers of first air outlet holes 411, and the diameter of the outer circular air outlet holes may be arranged in an increasing manner along the radial direction of the high-temperature air chamber 41. Please refer to Figure 3 , the shape of the first air outlet 411 can also be an annular groove, the corresponding central angle of the first air outlet 411 is β, between 10°≤β≤60°; the radial opening width of the first air outlet 411 is b, 5mm≤b≤50mm. The first air outlet 411 adopts a multi-layer annular groove design, with no less than 2 layers; the corresponding central angle β of the first air outlet 411 is between 10° and 60°; the radial opening width of the annular groove is between 5mm and 50mm; the number of annular grooves in each layer does not exceed the maximum integer of 300° / β; the radial distance between the centers of two adjacent layers of annular grooves is not less than the sum of the radial widths of the two adjacent layers of annular grooves; thereby ensuring the structural strength of the bottom wall of the high-temperature gas chamber 41.

[0045] In one embodiment, please refer to Figure 6 and Figure 7A heat exchange chamber 611 and a heat exchange channel 612 that passes through the heat exchange chamber 611 and is not connected to the heat exchange chamber 611 are formed in the heat exchanger 61, and the heat exchange channel 612 is an S-shaped elbow; both ends of the heat exchange chamber 611 are connected to an external circulation loop, and the heat exchange chamber 611 is used for the coolant to flow through; the heat exchange channel 612 is connected to the return air branch 6. When there are multiple heat exchange channels 612, the multiple heat exchange channels 612 are connected in parallel and arranged in parallel with each other, and the space occupied by the heat exchanger 61 is reduced by sharing one heat exchange chamber 611 with the multiple heat exchange channels 612. In order to reduce the pressure loss of inert gas caused by the heat exchange process, the heat exchange chamber 611 is connected to the return air branch 6, and both ends of the heat exchange channel 612 are connected to the external circulation loop. The inert gas enters the return air branch 6 after being cooled in the heat exchange chamber 611. The coolant cools the inert gas filling the inside of the heat exchange chamber 611 through the heat exchange channel 612. Multiple heat exchange channels 612 can be used for cooling to reduce the volume of the heat exchanger 61.

[0046] In other embodiments, the number of heat exchangers 61 corresponding to each return air branch 6 can be multiple, and each heat exchanger 61 is set with different heat exchange capacities according to the different gases entering the air chamber; the inert gas after passing through the heat exchanger 61 can meet the cooling capacity requirements of the atomized droplets when producing different alloys or production efficiency.

[0047] In one embodiment, the inert gas circulation loop 5 further includes an oxygen content detector 54 and an air supply pipe 55. The oxygen content detector 54 is arranged between the induced draft fan 53 and the return air branch 6. One end of the air supply pipe 55 is connected between the oxygen content detector 54 and the return air branch 6. The other end of the air supply pipe 55 is used to input external inert gas. The oxygen content detector 54 is arranged at the outlet of the induced draft fan 53. When the oxygen content detector 54 detects that the oxygen content of the inert gas meets the requirements, the inert gas participates in the gas recycling; when the oxygen content detector 54 detects that the oxygen content does not meet the requirements, the inert gas in the current inert gas circulation loop 5 is discharged and no longer participates in the gas circulation. At the same time, the air supply pipe 55 is opened to replenish new inert gas into the inert gas circulation loop 5 through the air supply pipe 55. An air supply control valve 57 is arranged on the air supply pipe 55 to control the on and off of the air supply pipe 55. In a preferred embodiment, the oxygen content detector 54 is located between the induced draft fan 53 and the return air fan 56 , and the air supply pipe 55 is located between the return air fan 56 and the return air branch 6 .

[0048] The inert gas circulation loop 5 further includes an exhaust valve 58 connected between the air supply pipe 55 and the induced draft fan 53 . When the exhaust valve 58 is opened, the inert gas is discharged from the inert gas circulation loop 5 . When the exhaust valve 58 is closed, the inert gas is reused through the inert gas circulation loop 5 .

[0049] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A centrifugal atomization powder equipment, characterized in that: The centrifugal atomization powder equipment comprises An atomization chamber, wherein a working chamber is formed in the atomization chamber; A centrifugal atomizer, wherein the centrifugal atomizer is disposed in the working chamber; A flow guide pipe, one end of which extends into the atomization chamber and is located at the top of the centrifugal atomizer, and the other end of which is used to input molten metal; A high-temperature air chamber and a low-temperature air chamber that are not connected to each other, wherein the high-temperature air chamber and the low-temperature air chamber are both arranged at the top of the working chamber, and the low-temperature air chamber is arranged around the periphery of the high-temperature air chamber, and the bottom wall of the high-temperature air chamber is provided with a first air outlet connected to the working chamber, and the low-temperature air chamber is provided with a second air outlet connected to the working chamber; the inert gas in the high-temperature air chamber forms a high-temperature inert gas flow through the first air outlet to ensure that the powder is fully spheroidized; the inert gas in the low-temperature air chamber forms a low-temperature inert gas flow through the second air outlet to meet the cooling requirements of the atomized droplets, and ensure that the atomized droplets do not erode the inner wall surface of the atomization chamber to prevent dust; An inert gas circulation loop, the inert gas circulation loop comprising two return air branches and a separator, a dust collector, an induced draft fan and a return air fan connected in series in sequence, the air inlet end of the separator being connected to the working chamber, the two return air branches being arranged in parallel and both being connected to the air outlet end of the return air fan, the two return air branches being arranged with a heat exchanger, and one return air branch being connected to the high temperature air chamber, and the other return air branch being connected to the low temperature air chamber; The centrifugal atomization powder equipment includes a guide plate and an adjustment mechanism, wherein the adjustment mechanism is arranged in the low-temperature air chamber, the guide plate is arranged at the second air outlet and connected to the output end of the adjustment mechanism, and the adjustment mechanism is used to push the guide plate to tilt so as to separate the second air outlet into two air flow channels; wherein, one of the air flow channels forms a low-temperature inert gas air flow toward the central axis of the working chamber, and the other air flow channel forms a low-temperature inert gas air flow toward the peripheral wall of the working chamber.

2. The centrifugal atomization powder equipment according to claim 1, characterized in that: The inclination angle between the guide plate and the vertical direction is -30° to 30°; the length of the guide plate extending out of the second air outlet is a, and the distance between the high-temperature air chamber and the centrifugal atomizer is b, wherein a≤b / 2.

3. The centrifugal atomization powder equipment according to claim 1, characterized in that: The edge of the second air outlet forms a baffle extending in a vertical direction, and the extension length of the baffle is smaller than the extension length of the guide plate.

4. The centrifugal atomization powder equipment according to claim 1, characterized in that: The number of the second air outlet holes is at least two, and the at least two second air outlet holes are arranged at intervals along the circumference of the working chamber.

5. The centrifugal atomization powder equipment according to claim 1, characterized in that: The outer diameter of the high-temperature gas chamber is R1, and the radius of the centrifugal atomizer is R2, wherein 10R2≤R1≤50R2.

6. The centrifugal atomization powder equipment according to claim 5, characterized in that: There are multiple first air outlet holes, and the multiple first air outlet holes form at least two layers of air outlet hole groups. The at least two layers of air outlet hole groups are arranged at radial intervals along the high-temperature air chamber, and the multiple first air outlet holes in the same air outlet hole group are arranged at circumferential intervals along the high-temperature air chamber.

7. The centrifugal atomization powder equipment according to claim 6, characterized in that: The first air outlet hole is a circular hole, and the diameter of the first air outlet hole in the outer layer is larger than the diameter of the first air outlet hole in the inner layer; or, The first air outlet is in the shape of an annular groove, and the corresponding central angle of the first air outlet is β, which is between 10°≤β≤60°; the opening width of the first air outlet along the radial direction is b, which is between 5mm≤b≤50mm.

8. The centrifugal atomization powder equipment according to any one of claims 1 to 7, characterized in that: The heat exchanger arranged on the return air branch includes a heat exchange chamber and a heat exchange channel passing through the heat exchange chamber and not connected with the heat exchange chamber. There are multiple heat exchange channels, and the multiple heat exchange channels are arranged in parallel and connected with the return air branch.

9. The centrifugal atomization powder equipment according to any one of claims 1 to 7, characterized in that: The inert gas circulation loop also includes an oxygen content detector and an air supply pipe. The oxygen content detector is arranged between the induced draft fan and the return air fan. One end of the air supply pipe is connected between the oxygen content detector and the return air branch, and the other end of the air supply pipe is used to input external inert gas.

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