CN117840444A - Inert gas heating gas atomizing equipment - Google Patents
Inert gas heating gas atomizing equipment Download PDFInfo
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- CN117840444A CN117840444A CN202410258330.4A CN202410258330A CN117840444A CN 117840444 A CN117840444 A CN 117840444A CN 202410258330 A CN202410258330 A CN 202410258330A CN 117840444 A CN117840444 A CN 117840444A
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 41
- 239000011261 inert gas Substances 0.000 title claims abstract description 29
- 238000009689 gas atomisation Methods 0.000 title claims abstract description 25
- 239000007789 gas Substances 0.000 claims abstract description 84
- 239000000843 powder Substances 0.000 claims abstract description 66
- 229910052751 metal Inorganic materials 0.000 claims abstract description 48
- 239000002184 metal Substances 0.000 claims abstract description 48
- 230000000694 effects Effects 0.000 claims abstract description 19
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- 230000008018 melting Effects 0.000 claims description 24
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- 229910045601 alloy Inorganic materials 0.000 claims description 15
- 239000000956 alloy Substances 0.000 claims description 15
- 239000004594 Masterbatch (MB) Substances 0.000 claims description 13
- 239000000155 melt Substances 0.000 claims description 13
- 239000007921 spray Substances 0.000 claims description 10
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- 230000000996 additive effect Effects 0.000 abstract description 3
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- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
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- 239000007788 liquid Substances 0.000 description 2
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- 229910001128 Sn alloy Inorganic materials 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 229910001297 Zn alloy Inorganic materials 0.000 description 1
- UHZZMRAGKVHANO-UHFFFAOYSA-M chlormequat chloride Chemical compound [Cl-].C[N+](C)(C)CCCl UHZZMRAGKVHANO-UHFFFAOYSA-M 0.000 description 1
- 238000013461 design Methods 0.000 description 1
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Abstract
The application provides inert gas heating gas atomization equipment, relates to the technical field of additive manufacturing. Through setting up plasma generating device, make plasma generating device and atomizer be connected, provide high temperature's plasma jet by plasma generating device and carry out direct heating to atomizing gas, can improve atomizing gas temperature to predetermineeing the requirement effectively, can effectively improve atomizing effect, improve the sphericity of powder, and reduce the satellite powder ratio, the improvement of atomizing gas temperature further promotes atomizing gas's speed, be favorable to improving atomizing efficiency, because atomizing gas's temperature regulation and control precision and stability are better, so atomizing effect's stability is also better, finally form supersonic speed atomizing air current with atomizing gas blowout by the atomizer, thereby atomizing metal melt.
Description
Technical Field
The application relates to the technical field of additive manufacturing, in particular to inert gas heating and gas atomizing equipment.
Background
The preparation of the metal powder raw material for additive manufacturing generally comprises the steps of enabling high-temperature metal melt to enter an atomization chamber, arranging an atomizer in the atomization chamber, enabling supersonic atomized airflow sprayed by the atomizer to interact with the high-temperature metal melt, and enabling high-temperature metal melt jet or molten drops to be crushed and atomized and quickly solidified to form metal powder. Because the supersonic atomized air flow temperature is lower, the spheroidization of the molten drops is insufficient, resulting in lower sphericity of the powder, and meanwhile, because the size distribution of the atomized molten drops is wide, when the molten drops with larger size are not completely solidified, the molten drops with small size are already solidified, so that the powder with larger particle size prepared by atomization is adhered with some powder with small particle size, thereby forming satellite powder. In addition, although the atomization efficiency and the fine powder yield can be improved by increasing the supersonic atomization airflow speed, the improvement of the supersonic atomization airflow speed can be realized by optimizing the atomizer and increasing the atomization pressure, but the supersonic atomization airflow speed is generally improved by increasing the atomization pressure due to the long period of the atomizer optimal design and the stability of the effect, and the supersonic atomization airflow speed is difficult to be effectively improved by further improving the atomization pressure after the atomization pressure is improved to a certain level, the supersonic atomization airflow speed can be further improved by improving the temperature of the atomization gas according to the aerodynamic theory, and the sphericity of the powder is improved after the temperature of the atomization gas is improved. Because the flow of the atomized air is large, the flow speed of the atomized air in the pipeline or the atomizer is high, and the temperature of the atomized air is difficult to be effectively improved by the conventional electromagnetic induction heating or bent pipe heat exchanger heating mode.
In view of the above problems, no effective technical solution is currently available.
Disclosure of Invention
The utility model aims at providing an inert gas adds hot air atomizing equipment can effectively improve atomization effect, improves the sphericity of powder, reduces satellite powder ratio, and atomization effect's stability is also better to be favorable to improving atomization efficiency.
The application provides an inert gas adds hot gas atomizing equipment, include: the device comprises a melt generating device, an atomizing chamber, an atomizer and a plasma generating device;
the atomizing chamber is arranged below the molten liquid generating device, the molten liquid generating device is used for providing molten metal for the atomizing chamber, the atomizer is arranged in the atomizing chamber, the plasma generating device is connected with the atomizer, the atomizer is connected with an external air supply device, the external air supply device is used for providing atomizing gas for the atomizer, the plasma generating device is used for providing plasma jet flow to heat the atomizing gas, and the atomizer is used for spraying the atomizing gas to form supersonic atomizing airflow so as to atomize the molten metal.
Specifically, the atomization effect can be effectively improved, the sphericity of the powder is improved, the satellite powder ratio is reduced, the stability of the atomization effect is better, and the atomization efficiency is improved.
Optionally, the melt generating device comprises a melting crucible and a tundish, wherein the melting crucible is used for melting the metal master batch into the metal melt, the tundish is connected with the metal melt through Yu Cheng, and the tundish is used for guiding the metal melt to the atomizing chamber through a guide nozzle.
Optionally, the melt generating device comprises a melting chamber, the lower end of the melting chamber is communicated with the upper end of the atomizing chamber, the melting chamber is provided with an alloy master batch rod and a heating device arranged around the lower end of the alloy master batch rod, the heating device is used for melting the alloy master batch rod and forming the metal melt, and the metal melt flows into the atomizing chamber under the action of gravity or air flow drag force.
Optionally, the atomizer is coaxial setting is in the central axis below of melt generating device's molten metal export, the atomizer is circular seam formula spray disc, the atomizer passes through the air feed line and is connected with outside air feeder, plasma generating device with the air feed line is connected, the air feed line is provided with a solid of revolution heating chamber, the heating chamber is including the section of admitting air, the section of converging and the export section that connect gradually, plasma generating device's delivery outlet with the coaxial setting of section of converging, just plasma generating device's delivery outlet orientation the export section, the diameter of admitting air the section is followed and is close to the direction of section of converging enlarges gradually, the diameter of section of converging is unchangeable, the diameter of export section is followed and is kept away from the direction of section of converging reduces gradually.
Through the arrangement, the high-temperature plasma jet output by the plasma generating device is mutually mixed with the atomized gas in the converging section and is subjected to energy transfer, and the high-temperature plasma jet is used for heating the atomized gas efficiently, so that the temperature control of the atomized gas is realized.
Optionally, the converging section is coaxially provided with a draft tube, an output port of the plasma generating device extends into the draft tube, a diameter of the draft tube gradually decreases along a direction approaching the outlet section, and the draft tube is used for guiding the plasma jet into the outlet section.
Through the arrangement, the probability that the plasma jet directly impacts the wall body of the gas supply pipeline can be reduced.
Optionally, a first included angle is formed between a generatrix of the air inlet section and a central axis of the heating cavity, and the first included angle ranges from 2 degrees to 10 degrees.
Optionally, the atomizer includes air inlet channel, air chamber and LAVAL type acceleration channel, plasma generating device's delivery outlet through coaxial setting drainage device with air inlet channel or air chamber slope is connected, drainage device's opening orientation air inlet channel or air chamber's air current direction, drainage device is used for with the plasma jet that plasma generating device spouted is directed air inlet channel or in the air chamber in order to heat the atomizing gas in the atomizer.
Optionally, the atomizer includes at least two around the spray tube structure that the central axis of atomising chamber set up, spray tube structure slope downward and the opening orientation the central axis slope of atomising chamber, spray tube structure includes from the top down the shrink section that connects gradually, throat and expansion section, every the spray tube structure all is provided with one plasma generating device, plasma generating device includes plasma torch and plasma nozzle, the delivery outlet of plasma torch with the plasma nozzle is connected, the plasma nozzle stretches into in the spray tube structure, the plasma jet of plasma nozzle blowout is to the atomizing gas heating of spray tube structure.
Optionally, the plasma nozzle protrudes into the convergent section of the nozzle structure, the opening of the plasma nozzle is towards the throat, and the central axis of the outlet of the plasma nozzle coincides with the central axis of the throat.
Optionally, the plasma nozzle protrudes into the throat of the nozzle structure, the opening of the plasma nozzle is directed towards the throat, and the central axis of the outlet of the plasma nozzle coincides with the central axis of the throat.
Optionally, the plasma nozzle extends into the diverging section of the nozzle structure, the opening of the plasma nozzle is oriented in the same direction as the gas flow of the nozzle structure, and the central axis of the outlet of the plasma nozzle coincides with the central axis of the throat.
Optionally, the plasma nozzle extends into the nozzle structure and below the outlet of the nozzle structure, and a central axis of the outlet of the plasma nozzle coincides with a central axis of the nozzle structure.
Optionally, the diameter of the plasma nozzle gradually decreases from top to bottom.
Optionally, the plasma nozzle is of a LAVAL structure, and the diameter of the plasma nozzle gradually decreases from top to bottom and then gradually increases.
Optionally, the device also comprises a first powder collecting tank, a second powder collecting tank, a third powder collecting tank, a cyclone separator, a dust remover and an induced draft fan;
the first powder collecting tank is arranged below the outlet of the atomizing chamber and is communicated with the outlet of the atomizing chamber, the side of the atomizing chamber is communicated with the cyclone separator through a first pipeline, a second powder collecting tank is arranged below the cyclone separator, the upper part of the cyclone separator is communicated with the dust remover through a second pipeline, the third powder collecting tank is arranged below the dust remover, and a first opening is arranged on the side of the dust remover and is communicated with the induced draft fan;
the first powder collecting tank is used for collecting particles in the atomizing chamber, the second powder collecting tank is used for collecting powder in the cyclone separator, the third powder collecting tank is used for collecting powder in the dust remover, and the induced draft fan is used for providing flowing suction force for exhaust gas of the atomizing chamber.
From the above, the inert gas heating gas atomizing equipment that this application provided, through setting up plasma generating device, make plasma generating device and atomizer be connected, provide high temperature plasma jet by plasma generating device and carry out direct heating to atomizing gas, can improve atomizing gas's temperature to predetermineeing the requirement effectively, can effectively improve atomizing effect, improve the sphericity of powder, and reduce satellite powder ratio, atomizing gas temperature's improvement further promotes atomizing gas's speed, be favorable to improving atomizing efficiency, because atomizing gas's temperature regulation and control precision and stability are better, so atomizing effect's stability is also better, finally form supersonic speed atomizing air current with atomizing gas blowout by the atomizer, thereby atomizing metal melt.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the embodiments of the application. The objects and other advantages of the present application may be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
Fig. 1 is a block diagram of an inert gas heating gas atomizing apparatus according to an embodiment of the present application.
Fig. 2 is a schematic diagram of a heating chamber and a plasma generating device according to an embodiment of the present application.
Fig. 3 is a schematic position diagram of an atomizer and a plasma generating device according to an embodiment of the present application.
Fig. 4 is another overall structure diagram of an inert gas heating gas atomizing apparatus according to an embodiment of the present application.
Fig. 5 is a schematic diagram of one of the positions of the nozzle structure and the plasma generating device according to the embodiment of the present application.
Fig. 6 is a schematic diagram of another position of the nozzle structure and the plasma generating device according to the embodiment of the present application.
Description of the reference numerals: 100. a melt generating device; 101. smelting a crucible; 102. a tundish; 103. a flow guiding nozzle; 104. a smelting chamber; 105. alloy master batch rod; 106. a heating device; 110. an atomizing chamber; 120. an atomizer; 121. an air intake passage; 122. a gas chamber; 123. a LAVAL-type acceleration channel; 130. a plasma generating device; 140. an air supply line; 141. a heating chamber; 142. an air inlet section; 143. a confluence section; 144. an outlet section; 145. a drainage tube; 146. a drainage device; 150. a nozzle structure; 151. a constriction section; 152. a throat; 153. an expansion section; 161. a plasma torch; 162. a plasma nozzle; 171. a first powder collecting tank; 172. a second powder collecting tank; 173. a third powder collecting tank; 174. a cyclone separator; 175. a dust remover; 176. and (5) a draught fan.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. The components of the embodiments of the present application, which are generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, as provided in the accompanying drawings, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, are intended to be within the scope of the present application.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only to distinguish the description, and are not to be construed as indicating or implying relative importance.
Referring to fig. 1 and 4, fig. 1 is an overall structure diagram of one of the inert gas heating gas atomization apparatuses in some embodiments of the present application, and fig. 4 is another overall structure diagram of the inert gas heating gas atomization apparatus in some embodiments of the present application. Can effectively improve atomization effect, improve sphericity of powder, reduce satellite powder ratio, the stability of atomization effect is also better to be favorable to improving atomization efficiency.
The application provides an inert gas adds hot gas atomizing equipment, include: a melt generating device 100, an atomizing chamber 110, an atomizer 120, and a plasma generating device 130;
the atomizing chamber 110 is disposed below the melt generating device 100, the melt generating device 100 is configured to supply a metal melt to the atomizing chamber 110, the atomizer 120 is disposed in the atomizing chamber 110, the plasma generating device 130 is connected to the atomizer 120, the atomizer 120 is connected to an external gas supply device, the external gas supply device is configured to supply an atomizing gas to the atomizer 120, the plasma generating device 130 is configured to supply a plasma jet to heat the atomizing gas, and the atomizer 120 is configured to spray the atomizing gas to form a supersonic atomizing gas flow, thereby atomizing the metal melt.
The plasma generating device 130 is high-temperature plasma used in industry, the power is generally not lower than 20KW, and the temperature of the plasma jet can reach 8000K-10000K.
Specifically, through setting up plasma generating device 130, make plasma generating device 130 and atomizer 120 be connected, the plasma jet that provides the high temperature by plasma generating device 130 carries out direct heating to atomizing gas, can effectively improve atomizing effect with the temperature of atomizing gas to predetermineeing the requirement, improve the sphericity of powder, and reduce the satellite powder ratio, the improvement of atomizing gas temperature further promotes the speed of atomizing gas, be favorable to improving atomizing efficiency, because atomizing gas's temperature regulation precision and stability are better, so atomizing effect's stability is also better, finally form supersonic speed atomizing air current with atomizing gas blowout by atomizer 120, thereby atomizing the metal melt.
In some embodiments, the melt generation device 100 includes a melting crucible 101 for melting a metal master batch into a metal melt, and a tundish 102 for holding the metal melt, the tundish 102 directing the metal melt to an atomizing chamber 110 through a spout 103.
Specifically, as shown in fig. 1, when the melt generating device 100 is provided with the melting crucible 101, the melt generating device 100 is mainly suitable for a conventional low-activity alloy such as an aluminum alloy, a copper alloy, a zinc alloy, a tin alloy, an iron-based alloy, or a nickel-based alloy.
In some embodiments, the melt generation apparatus 100 includes a melting chamber 104, a lower end of the melting chamber 104 being in communication with an upper end of an atomizing chamber 110, the melting chamber 104 being provided with an alloy masterbatch rod 105 and a heating device 106 disposed around the lower end of the alloy masterbatch rod 105, the heating device 106 being configured to melt the alloy masterbatch rod 105 and form a molten metal that flows into the atomizing chamber 110 under the force of gravity or drag of an air flow.
Specifically, as shown in fig. 4, since some special alloys are strongly reacted with the melting crucible 101, such as titanium alloy, etc., are not suitable for melting using the melting crucible 101, the melt generation apparatus 100 can be suitably used for melting some special alloys.
In some embodiments, the atomizer 120 is coaxially disposed below the central axis of the molten metal outlet of the molten metal generating device 100, the atomizer 120 is a circular seam type spray disk, the atomizer 120 is connected with an external air supply device through an air supply pipeline 140, the plasma generating device 130 is connected with the air supply pipeline 140, the air supply pipeline 140 is provided with a heating cavity 141 in a shape of a revolving body, the heating cavity 141 comprises an air inlet section 142, a confluence section 143 and an outlet section 144 which are sequentially connected, an output port of the plasma generating device 130 is coaxially disposed with the confluence section 143, an output port of the plasma generating device 130 faces the outlet section 144, the diameter of the air inlet section 142 is gradually enlarged in a direction close to the confluence section 143, the diameter of the confluence section 143 is unchanged, and the diameter of the outlet section 144 is gradually reduced in a direction away from the confluence section 143.
Specifically, as shown in fig. 1 and 2, the output port of the plasma generating device 130 is coaxially arranged with the confluence section 143, and the output port of the plasma generating device 130 faces the outlet section 144, firstly, the air inlet section 142 starts to circulate the atomized gas, when the atomized gas in the air inlet section 142 circulates normally, the plasma generating device 130 is started, the air inlet end of the plasma generating device 130 is opened at a lower pressure (the pressure is not more than 0.3 MPa), so that the plasma can be smoothly generated, after the plasma arcing is stable, the air inlet end pressure of the plasma generating device 130 is gradually increased to between 0.5MPa and 2.0MPa, the plasma generating device 130 outputs high-temperature plasma jet to be mutually mixed with the atomized gas in the confluence section 143 and energy is transferred, and the effect of the mutual mixing of the plasma jet and the atomized gas is further improved, and the high-temperature plasma jet is used for effectively heating the atomized gas, so that the temperature control of the atomized gas is realized.
In some embodiments, the converging section 143 is coaxially provided with a draft tube 145, the output port of the plasma-generating device 130 extending into the draft tube 145, the draft tube 145 decreasing in diameter in a direction toward the outlet section 144, the draft tube 145 for directing the plasma jet into the outlet section 144.
Specifically, the material of the gas supply pipeline 140 is generally stainless steel, and in order to reduce the probability that the high-temperature plasma jet directly impacts the wall body of the gas supply pipeline 140, a drainage pipe 145 is coaxially arranged in the converging section 143, so that the plasma jet flows out of the drainage pipe 145 with a narrowed outlet into the outlet section 144, thereby reducing the probability that the plasma jet directly impacts the wall body of the gas supply pipeline 140, wherein the material of the drainage pipe 145 can be graphite or other high-temperature-resistant materials (meeting the working temperature of the plasma jet).
In some embodiments, the generatrix of the air intake section 142 has a first angle a with the central axis of the heating chamber 141, the first angle a ranging from 2 ° to 10 °.
Specifically, by setting the range of the first included angle a, the atomized gas in the gas supply line 140 smoothly transitions from the gas inlet section 142 to the confluence section 143 to the outlet section 144.
In some embodiments, the atomizer 120 includes an air inlet channel 121, an air chamber 122 and a LAVAL accelerating channel 123, the output port of the plasma generating device 130 is connected with the air inlet channel 121 or the air chamber 122 in an inclined manner through a coaxially arranged drainage device 146, the opening of the drainage device 146 faces the air flow direction of the air inlet channel 121 or the air chamber 122, and the drainage device 146 is used for guiding the plasma jet ejected by the plasma generating device 130 into the air inlet channel 121 or the air chamber 122 to heat the atomized gas in the atomizer 120.
Specifically, as shown in fig. 3, the output port of the plasma generating device 130 is connected with the air inlet channel 121 or the air chamber 122 in an inclined manner through a coaxially arranged drainage device 146, and the opening of the drainage device 146 faces the air flow direction of the air inlet channel 121 or the air chamber 122, so that the plasma jet ejected by the plasma generating device 130 directly heats the atomized gas in the atomizer 120 in the air inlet channel 121 or the air chamber 122.
In some embodiments, there is a gap between the flow directing device 146 and the plasma generating device 130 for replenishing the inert gas to pre-mix the inert gas with the plasma jet in the flow directing device 146. On the one hand, the speed of the plasma jet is reduced by premixing, and on the other hand, partial energy transfer is realized by premixing, so that the temperature of the plasma jet is reduced, and the atomizer 120 is protected.
In some embodiments, the atomizer 120 comprises at least two nozzle structures 150 disposed about the central axis of the atomizing chamber 110, the nozzle structures 150 being inclined downwardly and opening toward the central axis of the atomizing chamber 110, the nozzle structures 150 comprising a converging section 151, a throat section 152 and an diverging section 153 connected in sequence from top to bottom, each nozzle structure 150 being provided with a plasma generating device 130, the plasma generating device 130 comprising a plasma torch 161 and a plasma nozzle 162, the output of the plasma torch 161 being connected to the plasma nozzle 162, the plasma nozzle 162 extending into the nozzle structure 150, the plasma jet from the plasma nozzle 162 heating the atomizing gas of the nozzle structure 150.
Specifically, as shown in fig. 4, the plasma torch 161 generates a high-temperature plasma jet to be ejected from the plasma nozzle 162 at a certain speed, and the plasma jet is mixed and energy-transferred with the atomized gas in the nozzle structure 150, so that the temperature of the atomized gas is effectively raised, wherein the material of the plasma nozzle 162 can be graphite.
In some embodiments, the plasma nozzle 162 protrudes into the converging section 151 of the nozzle structure 150, the opening of the plasma nozzle 162 is toward the throat 152, and the central axis of the outlet of the plasma nozzle 162 coincides with the central axis of the throat 152.
Specifically, when the plasma nozzle 162 extends into the convergent section 151 of the nozzle structure 150, the plasma jet emitted by the plasma nozzle 162 is mixed with the atomizing gas and energy is transferred in the convergent section 151, so that the plasma jet heats the atomizing gas.
In some embodiments, the plasma nozzle 162 protrudes into the throat 152 of the nozzle structure 150, the opening of the plasma nozzle 162 is toward the throat 152, and the central axis of the outlet of the plasma nozzle 162 coincides with the central axis of the throat 152.
Specifically, as shown in FIG. 5, when the plasma nozzle 162 extends into the throat 152 of the nozzle structure 150, the plasma jet and the atomizing gas mix and energy transfer directly in the throat 152 and further diffuse and mix in the diverging section 153, causing the plasma jet to heat the atomizing gas.
In some embodiments, the plasma nozzle 162 extends into the diverging section 153 of the nozzle structure 150, the opening of the plasma nozzle 162 is oriented in the same direction as the airflow of the nozzle structure 150, and the central axis of the outlet of the plasma nozzle 162 coincides with the central axis of the throat 152.
Specifically, as shown in fig. 6, when the plasma nozzle 162 extends into the diverging section 153 of the nozzle structure 150, the plasma jet and atomizing gas flow in the diverging section 153 and intermingle and transfer of energy occurs, effecting heating of the atomizing gas. Wherein. Because the temperature of the plasma jet ejected from the nozzle structure 150 is high and the velocity of the plasma jet is high (the velocity of the plasma jet can break through 1000m/s, the velocity of the atomized gas ejected from the nozzle structure 150 is generally 530 m/s-700 m/s), the plasma jet can partially contact the molten metal first, pre-atomize the molten metal and directly heat the molten metal, and then finally atomize the heated atomized gas, so that the atomization effect can be effectively improved, the sphericity of the powder can be improved, and the satellite powder ratio can be reduced.
In some embodiments, the plasma nozzle 162 extends into the nozzle structure 150 and extends below the outlet of the nozzle structure 150, and the central axis of the outlet of the plasma nozzle 162 coincides with the central axis of the nozzle structure 150.
Specifically, when the plasma nozzle 162 extends into the spout structure 150 and below the outlet of the spout structure 150, and because the plasma jet is at a higher temperature and a faster speed, the plasma jet contacts the molten metal first, pre-atomizes the molten metal and heats the molten metal, and then the atomized gas performs final atomization on the heated molten metal, thereby effectively improving the atomization effect, improving the sphericity of the powder, and reducing the satellite powder ratio.
In some embodiments, the diameter of the plasma nozzle 162 gradually decreases from top to bottom.
Specifically, since the diameter of the plasma nozzle 162 is gradually reduced from top to bottom, the flow channel of the plasma nozzle 162 is in a contracted structure, as shown in fig. 5, the plasma generated by the plasma torch 161 enters the plasma nozzle 162, and based on the law of conservation of energy, the plasma converts the internal energy (i.e. reducing the temperature of the plasma) into the kinetic energy (i.e. increasing the speed) during the flowing process of the plasma nozzle 162, so as to increase the speed of the plasma jet ejected from the plasma nozzle 162.
In some embodiments, the plasma nozzle 162 is of a LAVAL type configuration, with the diameter of the plasma nozzle 162 gradually decreasing from top to bottom and then gradually increasing.
Specifically, as shown in fig. 6, by providing the plasma nozzle 162 with a LAVAL type structure, the velocity of the plasma jet ejected from the plasma nozzle 162 is made to reach supersonic speed, so that the plasma jet is brought into contact with the molten metal, the molten metal is pre-atomized and preheated, and then the preheated molten metal is finally atomized by the atomizing gas, thereby effectively improving the atomization effect, improving the sphericity of the powder, and reducing the satellite powder ratio.
In some embodiments, further comprising a first powder collection tank 171, a second powder collection tank 172, a third powder collection tank 173, a cyclone 174, a dust separator 175, and an induced draft fan 176;
the first powder collecting tank 171 is arranged below the outlet of the atomizing chamber 110 and is communicated with the outlet of the atomizing chamber 110, the side of the atomizing chamber 110 is communicated with the cyclone separator 174 through a first pipeline, the second powder collecting tank 172 is arranged below the cyclone separator 174, the upper part of the cyclone separator 174 is communicated with the dust remover 175 through a second pipeline, the third powder collecting tank 173 is arranged below the dust remover 175, and a first opening is arranged on the side of the dust remover 175 and is communicated with the induced draft fan 176;
the first dust collection tank 171 is used for collecting particles in the atomizing chamber 110, the second dust collection tank 172 is used for collecting powder in the cyclone 174, the third dust collection tank 173 is used for collecting powder in the dust collector 175, and the induced draft fan 176 is used for providing a flowing suction force to the exhaust gas of the atomizing chamber 110.
Specifically, as shown in fig. 1 and 4, particles in the atomizing chamber 110 fall into the first powder collection tank 171, the air flow in the atomizing chamber 110 (with some powder) enters the cyclone 174 through the first duct under the suction force of the induced fan 176, the second powder collection tank 172 below the cyclone 174 collects some relatively large powder, and a part of the relatively fine powder continues to leave the cyclone 174 through the second duct with the air flow, and then enters the dust catcher 175, and the dust catcher 175 intercepts the powder in the air flow that cannot be discharged to the atmosphere through the filter core and falls into the third powder collection tank 173 below the dust catcher 175.
In this document, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.
The foregoing is merely exemplary embodiments of the present application and is not intended to limit the scope of the present application, and various modifications and variations may be suggested to one skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.
Claims (15)
1. An inert gas heating gas atomizing apparatus, comprising: a melt generating device (100), an atomizing chamber (110), an atomizer (120) and a plasma generating device (130);
the utility model provides a molten metal atomizing device, including atomizing room (110), atomizing device (100), atomizing room (110), atomizing device (100) are in the below of molten metal generating device (100), molten metal generating device (100) are used for to atomizing room (110) are provided metal molten, atomizer (120) set up in atomizing room (110), plasma generating device (130) with atomizer (120) are connected, atomizer (120) are connected with outside air feeder, outside air feeder is used for providing atomizing gas to atomizer (120), plasma generating device (130) are used for providing the plasma jet in order to heat atomizing gas, atomizer (120) are used for with atomizing gas blowout forms supersonic speed atomizing air current, thereby atomizing metal molten.
2. Inert gas heated gas atomizing apparatus according to claim 1, characterized in that said melt generating means (100) comprises a melting crucible (101) and a tundish (102), said melting crucible (101) being used for melting a metal master batch into a metal melt, said tundish (102) being used for receiving said metal melt, said tundish (102) leading said metal melt to said atomizing chamber (110) through a spout (103).
3. Inert gas heated gas atomizing apparatus according to claim 1, characterized in that said melt generating means (100) comprises a melting chamber (104), said melting chamber (104) being in lower end communication with said atomizing chamber (110), said melting chamber (104) being provided with an alloy masterbatch rod (105) and heating means (106) provided around the lower end of said alloy masterbatch rod (105), said heating means (106) being for melting said alloy masterbatch rod (105) and forming said metal melt, said metal melt flowing into said atomizing chamber (110) under the effect of gravity or gas flow drag.
4. An inert gas heated gas atomizing apparatus according to claim 2 or claim 3, characterized in that said atomizer (120) is coaxially disposed below the central axis of the metal melt outlet of said melt generating device (100), said atomizer (120) is a circular slit type spray disk, said atomizer (120) is connected with an external gas supply device through a gas supply line (140), said plasma generating device (130) is connected with said gas supply line (140), said gas supply line (140) is provided with a heating chamber (141) in the form of a revolution, said heating chamber (141) comprises a gas inlet section (142), a confluence section (143) and an outlet section (144) which are sequentially connected, the outlet of said plasma generating device (130) is coaxially disposed with said confluence section (143), and the outlet of said plasma generating device (130) is directed toward said outlet section (144), the diameter of said gas inlet section (142) is gradually enlarged in a direction approaching said confluence section (143), the diameter of said confluence section (143) is unchanged, and the diameter of said outlet section (144) is gradually reduced in a direction approaching said confluence section (144).
5. Inert gas heated gas atomizing apparatus according to claim 4, characterized in that said converging section (143) is coaxially provided with a draft tube (145), an output port of said plasma generating device (130) extending into said draft tube (145), a diameter of said draft tube (145) gradually decreasing in a direction approaching said outlet section (144), said draft tube (145) being for guiding said plasma jet into said outlet section (144).
6. Inert gas heated gas atomizing apparatus according to claim 4, characterized in that a generatrix of said inlet section (142) has a first angle with a central axis of said heating chamber (141), said first angle being in the range of 2 ° -10 °.
7. An inert gas heated gas atomizing apparatus according to claim 2 or claim 3, characterized in that said atomizer (120) comprises an air intake passage (121), a gas chamber (122) and a LAVAL-type accelerating passage (123), an output port of said plasma generating device (130) is connected obliquely to said air intake passage (121) or said gas chamber (122) by coaxially arranged drainage means (146), an opening of said drainage means (146) is directed in a direction of an air flow of said air intake passage (121) or said gas chamber (122), said drainage means (146) is for guiding said plasma jet ejected from said plasma generating device (130) into said air intake passage (121) or said gas chamber (122) for heating an atomized gas in said atomizer (120).
8. An inert gas heated gas atomizing apparatus according to claim 3, characterized in that said atomizer (120) comprises at least two nozzle structures (150) arranged around the central axis of said atomizing chamber (110), said nozzle structures (150) being inclined downwards and opening towards the central axis of said atomizing chamber (110), said nozzle structures (150) comprising a constriction section (151), a throat section (152) and an expansion section (153) connected in sequence from top to bottom, each of said nozzle structures (150) being provided with one of said plasma generating means (130), said plasma generating means (130) comprising a plasma torch (161) and a plasma nozzle (162), the output of said plasma torch (161) being connected to said plasma nozzle (162), said plasma nozzle (162) extending into said nozzle structures (150), said plasma jet ejected by said plasma nozzle (162) heating said atomizing gas of said nozzle structures (150).
9. Inert gas heated gas atomizing apparatus according to claim 8, characterized in that said plasma nozzle (162) protrudes into said converging section (151) of said nozzle structure (150), an opening of said plasma nozzle (162) is directed towards said throat (152), and a central axis of an outlet of said plasma nozzle (162) coincides with a central axis of said throat (152).
10. Inert gas heated gas atomizing apparatus according to claim 8, characterized in that said plasma nozzle (162) protrudes into said throat (152) of said nozzle structure (150), an opening of said plasma nozzle (162) is directed towards said throat (152), and a central axis of an outlet of said plasma nozzle (162) coincides with a central axis of said throat (152).
11. Inert gas heated gas atomizing apparatus according to claim 8, characterized in that said plasma nozzle (162) protrudes into said diverging section (153) of said nozzle structure (150), the opening of said plasma nozzle (162) is oriented in the same direction as the gas flow of said nozzle structure (150), and the central axis of the outlet of said plasma nozzle (162) coincides with the central axis of said throat (152).
12. The inert gas heated gas atomizing apparatus of claim 8, wherein said plasma nozzle (162) extends into said nozzle structure (150) and below an outlet of said nozzle structure (150), and a central axis of an outlet of said plasma nozzle (162) coincides with a central axis of said nozzle structure (150).
13. An inert gas heated gas atomizing apparatus according to claim 8, characterized in that the diameter of said plasma nozzle (162) gradually decreases from top to bottom.
14. The inert gas heated gas atomizing apparatus according to claim 8, wherein said plasma nozzle (162) is of a LAVAL type structure, and the diameter of said plasma nozzle (162) gradually decreases from top to bottom and then gradually increases.
15. The inert gas heating aerosolization apparatus of claim 1, further comprising a first powder collection tank (171), a second powder collection tank (172), a third powder collection tank (173), a cyclone (174), a dust collector (175), and an induced draft fan (176);
the first powder collecting tank (171) is arranged below an outlet of the atomizing chamber (110) and is communicated with the outlet of the atomizing chamber (110), the side of the atomizing chamber (110) is communicated with the cyclone separator (174) through a first pipeline, a second powder collecting tank (172) is arranged below the cyclone separator (174), the upper part of the cyclone separator (174) is communicated with the dust remover (175) through a second pipeline, the third powder collecting tank (173) is arranged below the dust remover (175), and a first opening is arranged on the side of the dust remover (175) and is communicated with the induced draft fan (176);
the first powder collection tank (171) is used for collecting particles in the atomizing chamber (110), the second powder collection tank (172) is used for collecting powder in the cyclone separator (174), the third powder collection tank (173) is used for collecting powder in the dust remover (175), and the induced draft fan (176) is used for providing a flowing suction force for the exhaust gas of the atomizing chamber (110).
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