Efficient and controllable nanopowder production equipment

Abstract

The invention relates to the technical field of nano powder production, and provides an efficient and controllable nano powder preparation device, comprising an evaporation device, a continuous feeding device and a condensation device. The evaporation device comprises a first cabin, an evaporation tube, a crucible and an induction coil both arranged in the first cabin, the induction coil is arranged around the outer wall of the crucible, the crucible comprises a crucible body with a heating chamber and a cover body arranged on the crucible body, one end of the evaporation tube passes through the cover body to be connected to the heating chamber and the other end is connected to the condensation device, the continuous feeding device comprises a feeding cabin, a feeding pipe and a first air inlet pipe, one end of the feeding pipe is connected to the feeding cabin and the other end passes through the cover body to be connected to the heating chamber, the first air inlet pipe is connected to the feeding pipe to form a passage, the above-mentioned nano powder preparation device has high production efficiency and low production cost, and can effectively realize the control of the particle size of the nano powder, so that the nano powder preparation device can prepare nano powders with corresponding particle sizes for different application fields, and has good universal performance.

Description

Technical Field

[0001] The invention relates to the technical field of nano powder production, and in particular provides a highly efficient and controllable nano powder preparation device. Background Art

[0002] Nanopowder refers to ultrafine particles with a particle size range of 1nm to 100nm, which has extremely important application value in research fields such as metallurgy, machinery, chemical industry, electronics, national defense, nuclear technology, aerospace, etc.

[0003] At present, there are many methods for preparing nanopowders, such as evaporation-condensation method, electric explosion method, etc. Among them, the evaporation-condensation method is to heat the raw materials to evaporate into gaseous state, and then quickly cool the vapor to obtain nanopowder. The nanopowder obtained by evaporation-condensation method has the characteristics of high purity, good particle shape, and narrow particle size distribution range.

[0004] However, since the production method of the existing nanopowder preparation equipment using the evaporation-condensation method is a non-continuous production method, cleaning work is required after each batch of production is completed. Since the nanopowder is highly active and has strong adhesion, each cleaning work takes a long time, resulting in low production efficiency. At the same time, the crucible of the nanopowder preparation equipment will cool down after each batch of production. After multiple hot and cold cycles, the crucible will crack, resulting in the need to frequently replace the crucible, increasing production costs. In addition, the existing nanopowder preparation equipment is difficult to control the particle size of the nanopowder during the preparation process, resulting in the inability to prepare nanopowders of corresponding particle sizes for various application fields, and the general performance is poor. Summary of the invention

[0005] The purpose of the present invention is to provide an efficient and controllable nano powder preparation device, aiming to solve the technical problems of low production efficiency, high production cost, difficulty in controlling the particle size of nano powder and poor general performance of existing nano powder preparation devices.

[0006] To achieve the above-mentioned purpose, the technical solution adopted in the embodiment of the present invention is: an efficient and controllable nanopowder preparation equipment, including an evaporation device, a continuous feeding device and a condensation device, the evaporation device includes a first cabin, an evaporation tube, and a crucible and an induction coil both arranged in the first cabin, the induction coil is arranged around the outer wall of the crucible, the crucible includes a crucible body with a heating chamber and a cover body covered on the crucible body, one end of the evaporation tube passes through the cover body to be connected to the heating chamber and the other end is connected to the condensation device, the continuous feeding device includes a feeding cabin, a feeding pipe and a first air inlet pipe, one end of the feeding pipe is connected to the feeding cabin and the other end passes through the cover body to be connected to the heating chamber, and the first air inlet pipe is connected to the feeding pipe to form a passage.

[0007] The efficient and controllable nanopowder production equipment provided by the embodiment of the present invention has at least the following beneficial effects: when working, the raw material is added to the crucible body, the induction coil is energized and generates electromagnetic induction to heat the crucible body or the metal raw material in the crucible body, when the internal temperature of the crucible body or the temperature of the metal raw material reaches a predetermined temperature value, the raw material begins to evaporate into a gaseous state, at this time, an inert gas is continuously introduced into the first air inlet pipe, the inert gas enters the heating chamber of the crucible body through the feed pipe, and the vapor is brought into the evaporation tube, the vapor enters the condensation device through the evaporation tube, and is rapidly cooled in the condensation device to form nanopowder. In the above process, the raw materials in the feeding chamber of the continuous feeding device are input into the crucible body through the feeding pipe to realize the replenishment of the raw materials and realize the continuous production of the nano powder preparation equipment, eliminating the trouble of stopping the equipment for feeding in the past, saving the time for cleaning the inside of the equipment, and avoiding the cracking of the crucible after multiple hot and cold cycles, with high production efficiency and low production cost; in addition, by adjusting the heating power of the induction coil and the gas flow rate in the first air inlet pipe, the evaporation rate of the raw material can be effectively controlled, thereby achieving the purpose of controlling the particle size of the nano powder, so that the above nano powder preparation equipment can prepare nano powders with corresponding particle sizes for different application fields, effectively improving the general performance of the above nano powder preparation equipment.

[0008] In one embodiment, the condensing device includes a second cabin and a second air inlet pipe connected to the second cabin, the crucible is connected to the second cabin through the evaporation pipe, the evaporation pipe is connected to the second cabin, and the second air inlet pipe is used to transport cooling medium into the second cabin.

[0009] In one embodiment, the condensing device also includes an annular condensing nozzle arranged in the second cabin and forming an air inlet cavity therein, the second air inlet pipe is connected to the air inlet cavity of the annular condensing nozzle, the annular condensing nozzle is provided with an air jet along the peripheral wall, the air jet direction of the air jet is arranged at an acute angle to the axis of the annular condensing nozzle, and the outlet end of the evaporating tube is arranged opposite to the annular condensing nozzle.

[0010] In one embodiment, the condensing device is disposed on the evaporating device.

[0011] In one embodiment, a first heat insulating member is provided between the condensing device and the evaporating device.

[0012] In one embodiment, the continuous feeding device further comprises a feeding mechanism, and the feeding mechanism is arranged between the feeding chamber and the feeding pipe.

[0013] In one embodiment, the nano powder preparation equipment further comprises a collecting device connected to the condensing device, the collecting device comprises a filtering assembly, the filtering assembly comprises a first condensing member and a filter cloth, and the filter cloth is coated on the first condensing member.

[0014] In one embodiment, the collecting device further includes a filter chamber, a first collecting chamber connected to the filter chamber, and a fourth air inlet pipe connected to the first collecting chamber, the filter assembly is disposed in the filter chamber, and a second condensing element is disposed in the first collecting chamber.

[0015] In one embodiment, the nano powder preparation equipment further includes a cyclone separation device, and the cyclone separation device is connected between the condensation device and the collection device.

[0016] In one embodiment, the evaporation device further comprises a tray and a furnace leakage alarm electrically connected to the induction coil, the tray is disposed in the first cabin and below the crucible, and the furnace leakage alarm is disposed on the tray. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, 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 these drawings without paying creative labor.

[0018] Figure 1 A schematic diagram of the structure of an efficient and controllable nanopowder preparation device provided by an embodiment of the present invention;

[0019] Figure 2 for Figure 1 The schematic diagram of the structure of the evaporation device in the highly efficient and controllable nano powder preparation equipment shown;

[0020] Figure 3 for Figure 1 A schematic diagram of the connection structure between the continuous feeding device and the crucible in the highly efficient and controllable nanopowder preparation equipment shown;

[0021] Figure 4 for Figure 1 The schematic diagram of the structure of the condensation device in the highly efficient and controllable nano powder production equipment shown;

[0022] Figure 5 for Figure 4 A schematic diagram of the structure of an annular condensation nozzle in the condensation device shown;

[0023] Figure 6 for Figure 5The AA section view of the annular condensing nozzle shown;

[0024] Figure 7 for Figure 1 A schematic structural diagram of a first heat insulating member in the highly efficient and controllable nano powder production device shown;

[0025] Figure 8 for Figure 1 A schematic diagram of the structure of a collecting device in the highly efficient and controllable nanopowder preparation device shown;

[0026] Fig. 9 for Figure 8 A schematic diagram of the structure of the filter assembly in the collection device shown;

[0027] Fig.10 for Figure 1 The schematic diagram of the structure of the cyclone separation device in the efficient and controllable nano powder production equipment is shown.

[0028] Among them, the reference numerals in the figure are:

[0029] 10. Evaporation device, 11. First cabin, 111. Third air inlet pipe, 112. First vacuum monitor, 113. First observation window, 12. Evaporation tube, 13. Crucible, 131. Crucible body, 132. Cover, 14. Induction coil, 15. Tray, 16. Leakage furnace alarm, 20. Continuous feeding device, 21. Feeding cabin, 211. Second observation window, 22. Feeding pipe, 23. First air inlet pipe, 24. Feeding mechanism, 241. Motor, 242. Screw shaft, 25. First valve, 30. Condensation device, 31. Second cabin, 32. Second air inlet pipe, 33. Annular condensation nozzle, 331. Air inlet cavity, 332. Jet nozzle, 333. First air inlet, 334. Second air inlet, 40. First thermal insulation Part, 41, first through hole, 42, second through hole, 43, air outlet, 44, second thermal insulation part, 50, collecting device, 51, filtering assembly, 511, first condensing part, 512, filter cloth, 513, supporting tube, 5131, air hole, 52, filtering cabin, 53, first collecting cabin, 531, second condensing part, 532, second vacuum monitor, 54, fourth air inlet pipe, 55, high pressure impact mechanism, 551, high pressure generator, 552, fifth air inlet pipe, 553, second solenoid valve, 56, second valve, 57, vacuum tube, 58, first solenoid valve, 60, cyclone separation device, 61, separation cabin, 62, second collecting cabin, 621, sixth air inlet pipe, 622, third vacuum monitor, 70, vacuum generating device. DETAILED DESCRIPTION

[0030] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0031] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0032] In addition, the terms "first", "second", "third", "fourth", "fifth", and "sixth" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", "third", "fourth", "fifth", and "sixth" may explicitly or implicitly include one or more of the feature. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0033] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it 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. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] Please combine Figures 1 to 3As shown, an efficient and controllable nano powder preparation device includes an evaporation device 10, a continuous feeding device 20 and a condensation device 30. The evaporation device 10 includes a first cabin 11, an evaporation tube 12, and a crucible 13 and an induction coil 14 both arranged in the first cabin 11. The induction coil 14 is arranged around the outer wall of the crucible 13. The crucible 13 includes a crucible body 131 with a heating chamber and a cover body 132 covered on the crucible body 131. One end of the evaporation tube 12 passes through the cover body 132 and is connected to the heating chamber, and the other end is connected to the condensation device 30. The continuous feeding device 20 includes a feeding chamber 21, a feeding pipe 22 and a first air inlet pipe 23. One end of the feeding pipe 22 is connected to the feeding chamber 21 and the other end passes through the cover body 132 and is connected to the heating chamber. The first air inlet pipe 23 is connected to the feeding pipe 22 to form a passage. The first air inlet pipe 23 is connected to an external air source, and the external air source is used to transport an inert gas, such as argon, nitrogen, etc., to the first air inlet pipe 23.

[0035] When the above-mentioned nanopowder production equipment is working, the raw material is added to the crucible body 131 of the crucible 13, the induction coil 14 is energized and generates electromagnetic induction to heat the crucible body 131 or the metal raw material in the crucible body 131. When the internal temperature of the crucible body 131 or the temperature of the metal raw material reaches a predetermined temperature value, the raw material begins to evaporate into a gaseous state. At this time, an inert gas is continuously introduced into the first air inlet pipe 23, and the inert gas enters the heating chamber of the crucible body 131 through the feed pipe 22, bringing the vapor into the evaporation tube 12, and the vapor enters the condensation device 30 through the evaporation tube 12, and is rapidly cooled in the condensation device 30 to form nanopowder. In the above process, the raw materials in the feeding chamber 21 of the continuous feeding device 20 are input into the crucible body 131 through the feeding pipe 22 to realize the replenishment of the raw materials and realize the continuous production of the nano powder preparation equipment, eliminating the trouble of stopping the equipment for feeding in the past, saving the time for cleaning the inside of the equipment, and avoiding the cracking of the crucible 13 after multiple hot and cold cycles, with high production efficiency and low production cost; in addition, by adjusting the heating power of the induction coil 14 and the gas flow rate in the first air inlet pipe 23, the evaporation rate of the raw materials can be effectively controlled, so as to achieve the purpose of controlling the particle size of the nano powder, so that the above nano powder preparation equipment can prepare nano powders with corresponding particle sizes for different application fields, effectively improving the general performance of the above nano powder preparation equipment.

[0036] Furthermore, the inert gas is transported to the feed pipe 22 through the first air inlet pipe 23 , which can cool the feed pipe 22 on the one hand, and prevent the steam generated in the crucible 13 from flowing back into the feed pipe 22 on the other hand.

[0037] In this embodiment, please combine Figure 4As shown, the condensing device 30 includes a second cabin 31 and a second air inlet pipe 32 connected to the second cabin 31, the evaporating pipe 12 is connected to the second cabin 31, and the second air inlet pipe 32 is connected to an external air source, and the external air source transports a cooling medium into the second cabin 31 through the second air inlet pipe 32, wherein the cooling medium may be liquid nitrogen, compressed nitrogen, argon, carbon dioxide, hydrogen, etc. The particle size of the nano powder is controlled by adjusting the flow rate of the cooling medium and changing the type of the cooling medium. Thus, the particle size of the nano powder is controlled by combining the heating power adjustment technology of the induction coil 14, the gas flow rate adjustment technology of the first air inlet pipe 23, the gas flow rate adjustment technology of the second air inlet pipe 32, and the air intake type adjustment technology of the second air inlet pipe 32, so as to more effectively improve the particle size control accuracy of the nano powder, so that the above-mentioned nano powder preparation device can prepare nano powders of corresponding particle sizes for more different application fields, and more effectively improve the general performance of the above-mentioned nano powder preparation device.

[0038] The above technical solution is described below with examples.

[0039] For example, nano copper powder is prepared using the above-mentioned nano powder preparation equipment, a copper rod with a diameter of 4 mm and a length of 6 mm is poured into the crucible body 131 and the charging chamber 21, the vacuum generating device 70 is turned on, the air pressure in the first chamber 11 is evacuated to less than 10 Pa, the induction coil 14 is turned on, and the power of the induction coil 14 is gradually adjusted from small to large to 20 KW, and argon is introduced into the crucible 13 through the first air inlet pipe 23 at a flow rate of 20 L / min. When the melt begins to evaporate in large quantities, liquid nitrogen is introduced into the second chamber 31 through the second air inlet pipe 32, and the vacuum degree in the first chamber 11 is controlled to reach 20 KPa. Finally, the particle size of the prepared nano copper powder is mainly distributed in the range of 20 nm-60 nm, the average particle size is 43 nm, and the production efficiency is 400 g / h.

[0040] For another example, nano copper powder is prepared using the above-mentioned nano powder preparation equipment, a copper rod with a diameter of 4 mm and a length of 6 mm is poured into the crucible body 131 and the charging chamber 21, the vacuum generating device 70 is turned on, the air pressure in the first chamber 11 is evacuated to less than 10 Pa, the induction coil 14 is turned on, and the power of the induction coil 14 is gradually adjusted from small to large to 22 KW, and argon is introduced into the crucible 13 through the first air inlet pipe 23 at a flow rate of 22 L / min. When the melt begins to evaporate in large quantities, carbon dioxide is introduced into the second chamber 31 through the second air inlet pipe 32, and the vacuum degree in the first chamber 11 is controlled to reach 15 KPa. Finally, the particle size of the prepared nano copper powder is mainly distributed in the range of 30 nm-80 nm, the average particle size is 52 nm, and the production efficiency is 450 g / h.

[0041] For another example, nano copper powder is prepared using the above-mentioned nano powder preparation equipment, a copper rod with a diameter of 4 mm and a length of 6 mm is poured into the crucible body 131 and the feeding chamber 21, the vacuum generating device 70 is turned on, the air pressure in the first chamber 11 is evacuated to less than 10 Pa, the induction coil 14 is turned on, and the power of the induction coil 14 is gradually adjusted from small to large to 20 KW, and argon is introduced into the crucible 13 through the first air inlet pipe 23 at a flow rate of 18 L / min. When the melt begins to evaporate in large quantities, compressed nitrogen is introduced into the second chamber 31 through the second air inlet pipe 32, and the vacuum degree in the first chamber 11 is controlled to reach 15 KPa. Finally, the particle size of the prepared nano copper powder is mainly distributed in the range of 30 nm-100 nm, the average particle size is 61 nm, and the production efficiency is 380 g / h.

[0042] For another example, nano silver powder is prepared using the above-mentioned nano powder preparation equipment, water droplets of silver with a particle size of 2mm-4mm are poured into the crucible body 131 and the feeding cabin 21, the vacuum generating device 70 is turned on, the air pressure in the first cabin 11 is evacuated to less than 10Pa, the induction coil 14 is turned on, and the power of the induction coil 14 is gradually adjusted from small to large to 18KW, and argon is introduced into the crucible 13 through the first air inlet pipe 23 at a flow rate of 15L / min. When the melt begins to evaporate in large quantities, liquid nitrogen is introduced into the second cabin 31 through the second air inlet pipe 32, and the vacuum degree in the first cabin 11 is controlled to reach 15KPa. Finally, the particle size of the prepared nano copper powder is mainly distributed in the range of 30nm-70nm, the average particle size is 45nm, and the production efficiency is 910g / h.

[0043] Specifically, please combine Figure 2 As shown, the first cabin body 11 is provided with a third air inlet pipe 111 connected with the interior thereof, and the third air inlet pipe 111 is connected with an external air source. Since the heat generated when the induction coil is working will radiate to the first cabin body 11, the external air source transports cooling medium to the interior of the first cabin body 11 through the third air inlet pipe 111, which can effectively cool the first cabin body 11.

[0044] Specifically, please combine Figure 2 As shown, a first vacuum monitor 112 is provided on the first cabin 11 , and the first vacuum monitor 112 is used to monitor the vacuum degree in the first cabin 11 in real time.

[0045] Specifically, please combine Figure 2 As shown, a first observation window 113 is provided on the first cabin 11 so that the staff can observe the internal situation of the first cabin 11 in real time.

[0046] Specifically, please combine Figure 3As shown, the continuous feeding device 20 also includes a feeding mechanism 24 disposed between the feeding cabin 21 and the feeding pipe 22, and the feeding mechanism 24 includes a motor 241 and a screw shaft 242 connected to the power output end of the motor 241. The raw materials in the feeding cabin 21 fall into the space where the screw shaft 242 is located. By controlling the rotation speed of the motor 241, the rotation speed of the driving screw shaft 242 can be controlled, so as to accurately control the speed at which the raw materials enter the feeding pipe 22, and realize accurate continuous feeding to the crucible 13, thereby realizing stable and continuous production of nano powder. In addition, a first valve 25, such as a manual valve, an electric valve, etc., is provided between the feeding cabin 21 and the feeding mechanism 24, so as to control the connection or disconnection between the feeding cabin 21 and the feeding mechanism 24 according to actual production needs.

[0047] Specifically, please combine Figure 3 As shown, a second observation window 211 is provided on the charging cabin 21 so that the staff can observe the usage of the raw materials in the charging cabin 21 in real time.

[0048] Specifically, please combine Figures 4 to 6 As shown, the condensing device 30 also includes an annular condensation nozzle 33 disposed in the second cabin 31 and forming an air inlet cavity 331 therein, the second air inlet pipe 32 is connected to the air inlet cavity 331 of the annular condensation nozzle 33, the annular condensation nozzle 33 is provided with a jet port 332 along the peripheral wall, the jet direction of the jet port 332 is arranged at an acute angle to the axis of the annular condensation nozzle 33, and the outlet end of the evaporation tube 12 is arranged opposite to the annular condensation nozzle 33. Specifically, the annular condensation nozzle 33 can be provided with annular jet ports 332 continuously along the peripheral wall, or multiple jet ports 332 can be provided at intervals along the peripheral wall, the cooling medium enters the air inlet cavity 331 of the annular condensation nozzle 33 through the second air inlet pipe 32, and is ejected outward from the jet port 332 to form a conical cooling medium barrier, so that the ejection pressure of the cooling medium can be increased, the ejection speed can be accelerated, and all the steam ejected from the evaporation tube 12 can be quickly cooled, so that the particle size distribution of the prepared nano powder is narrow, and the particle size of the nano powder is easier to control.

[0049] Specifically, please combine Figure 6 As shown, the angle a formed by the jet direction of the jet port 332 and the axis of the annular condensation nozzle 33 is 20° to 70°, such as 20°, 45°, and 70°.

[0050] Specifically, please combine Figure 6As shown, the annular condensation nozzle 33 is symmetrically provided with a first air inlet 333 and a second air inlet 334, and the first air inlet 333 and the second air inlet 334 are both used to connect with the second air inlet pipe 32, so that the overall air inlet pressure of the annular condensation nozzle 33 can be kept consistent, and the injection speed of the cooling medium ejected from the air jets 332 at various locations of the annular condensation nozzle 33 can be made consistent, thereby achieving uniform and rapid cooling of the steam ejected from the evaporation tube 12.

[0051] In this embodiment, please combine Figure 1 As shown, the condensing device 30 is arranged on the evaporating device 10. For example, the condensing device 30 is installed above the evaporating device 10, or the condensing device 30 is installed on the outside of the evaporating device 10. In this way, the setting distance between the condensing device 30 and the evaporating device 10 can be shortened to the maximum extent, thereby shortening the length of the evaporating tube 12, avoiding the steam from cooling and adhering to the inner wall of the evaporating tube 12 after flowing in the evaporating tube 12 for a long time, and effectively preventing the evaporating tube 12 from being blocked.

[0052] Specifically, please combine Figure 1 As shown, a first heat insulating member 40 is provided between the condensing device 30 and the evaporating device 10. The first heat insulating member 40 can effectively prevent the heat in the evaporating device 10 from being transferred to the condensing device 30, thereby ensuring the cooling effect of the condensing device 30.

[0053] Specifically, please combine Figure 7 As shown, the first thermal insulation member 40 is provided with a first through hole 41 for the feeding pipe 22 of the continuous feeding device 20 to pass through, and a second through hole 42 for the evaporation tube 12 of the evaporation device 10 to pass through, wherein a second thermal insulation member 44 is provided between the hole wall of the second through hole 42 and the evaporation tube 12 to prevent the first thermal insulation member 40 from directly contacting the evaporation tube 12, causing the heat on the evaporation tube 12 to be absorbed by the first thermal insulation member 40, thereby causing the vapor to cool inside the evaporation tube 12 and adhere to the inner wall of the evaporation tube 12, thereby effectively preventing the evaporation tube 12 from being blocked.

[0054] Specifically, please combine Figure 7 As shown, an air outlet 43 is also provided on the first heat insulation member 40, and a filter element (not shown in the figure) is provided in the air outlet 43. After the cooling medium enters the first cabin 11 from the third air inlet pipe 111, it is discharged into the condensing device 30 through the air outlet 43. The filter element is used to filter the dust in the first cabin 11 to prevent pollution to the interior of the condensing device 30.

[0055] Specifically, the first thermal insulation member 40 is a hollow disc-shaped structure, and a cooling medium is placed in the first thermal insulation member 40 to prevent the heat in the evaporation device 10 from being transferred to the condensation device 30 .

[0056] In this embodiment, please combine Figure 8 and Fig. 9As shown, the nano powder preparation device further includes a collecting device 50 connected to the condensing device 30, and the collecting device 50 includes a filtering assembly 51, and the filtering assembly 51 includes a first condensing member 511 and a filter cloth 512, and the filter cloth 512 is coated on the first condensing member 511. Specifically, the filtering assembly 51 further includes a supporting cylinder 513 having a plurality of air holes 5131, and the first condensing member 511 is a condensing tube and is arranged around the outer wall of the supporting cylinder 513. When the nano powder is adsorbed on the filter cloth 512, the heat on the filter cloth 512 is continuously accumulated, and the first condensing member 511 can effectively cool the filter cloth 512 to prevent the filter cloth 512 from burning.

[0057] Specifically, please combine Figure 8 As shown, the collecting device 50 further includes a filter cabin 52, a first collecting cabin 53 connected to the filter cabin 52, and a fourth air inlet pipe 54 connected to the first collecting cabin 53. The filter assembly 51 is arranged in the filter cabin 52, and a second condensation member 531 is arranged in the first collecting cabin 53. After the filter assembly 51 separates the nano powder from the gas, the nano powder falls from the filter cabin 52 to the first collecting cabin 53, and an inert gas is introduced into the first collecting cabin 53 through the fourth air inlet pipe 54 until the vacuum degree of the first collecting cabin 53 reaches one atmosphere, so as to realize the collection of the nano powder; in addition, if the surface of the nano powder in the first collecting cabin 53 needs to be micro-passivated, dry air can be slowly introduced into the first collecting cabin 53 through the fourth air inlet pipe 54, and at the same time, the second condensation member 531 absorbs the heat generated during the passivation of the nano powder, so as to avoid the rapid accumulation of heat in the first collecting cabin 53 and cause the nano powder to spontaneously combust, and effectively realize the slow passivation of the nano powder.

[0058] Specifically, please combine Figure 8 As shown, the collecting device 50 also includes a high-pressure impact mechanism 55, a vacuum pipe 57 and a first electromagnetic valve 58. The external vacuum generator is connected to the filter cabin 52 through the vacuum pipe 57. The first electromagnetic valve 58 is arranged on the vacuum pipe 57. The high-pressure impact mechanism 55 includes a high-pressure generator 551, a fifth air intake pipe 552, and a second electromagnetic valve 553. The fifth air intake pipe 552 is connected to the filter assembly 51. The second electromagnetic valve 553 is arranged on the fifth air intake pipe 552. When the nano powder on the filter cloth 512 is When a certain amount of gas accumulates, it will affect the air extraction rate, causing the air pressure in the entire cabin to rise. When the first vacuum detector 112 detects that the vacuum degree of the first cabin 11 reaches the set value, the second solenoid valve 553 is opened and the first solenoid valve 58 is closed. At this time, the high-pressure gas from the high-pressure generator 551 enters the filter assembly 51 through the fifth air inlet pipe 552. The high-pressure gas impacts the filter cloth 512, causing the nanopowder on the filter cloth 512 to detach and fall into the first collection cabin 53, so as to collect the nanopowder.

[0059] Specifically, please combine Figure 8As shown, a second vacuum monitor 532 is provided on the first collecting chamber 53, and a second valve 56 is provided between the filter chamber 52 and the first collecting chamber 53. When the nano powder falls from the filter cloth 512, the second valve 56 opens, and the nano powder falls into the first collecting chamber 53. Then the second valve 56 is closed, and the second vacuum monitor 532 monitors the vacuum degree in the first collecting chamber 53 in real time.

[0060] Specifically, please combine Figure 1 As shown, the nano powder preparation device further includes a cyclone separation device 60, which is connected between the condensation device 30 and the collection device 50. The nano powder cooled by the condensation device 30 enters the cyclone separation device 60, and the cyclone separation device 60 can separate the nano powder with a larger particle size, while the nano powder with a smaller particle size is collected by the collection device 50, which effectively narrows the particle size distribution range of the nano powder.

[0061] Specifically, please combine Fig.10 As shown, the cyclone separator includes a separation chamber 61 and a second collection chamber 62. A rotating airflow is formed inside the separation chamber 61, and the nanopowder flows with the rotating airflow. Nanopowder with larger particle size falls into the second collection chamber 62 under the action of gravity, while nanopowder with smaller particle size is collected by the collecting device 50.

[0062] Specifically, please combine Fig.10 As shown, the second collecting chamber 62 is provided with a sixth air inlet pipe 621, which is connected to an external air source. The external air source introduces inert gas or dry air into the second collecting chamber 62 through the sixth air inlet pipe 621 to perform protective collection or passivation treatment on the nanopowder in the second collecting chamber 62.

[0063] Specifically, please combine Fig.10 As shown, a third vacuum monitor 622 is provided on the second collecting chamber 62 , and the third vacuum monitor 622 is used to monitor the vacuum degree of the second collecting chamber 62 in real time.

[0064] In this embodiment, please combine Figure 2 As shown, the evaporation device 10 further includes a tray 15 and a furnace leakage alarm electrically connected to the induction coil 14. The tray 15 is arranged in the first cabin 11 and below the crucible 13. The furnace leakage alarm is arranged on the tray 15. When the crucible 13 is broken, the melt flows from the crucible 13 to the tray 15 and contacts the furnace leakage alarm 16, thereby triggering the furnace leakage alarm 16 to cut off the power supply of the induction coil 14 and sound an alarm, notifying the staff to replace the crucible 13.

[0065] Specifically, the tray 15 has a conical structure, and the furnace leakage alarm 16 is arranged in the middle position of the tray 15. When the crucible 13 breaks, the solution flows from the crucible 13 to the tray 15 and accumulates in the middle position of the tray 15, and contacts with the furnace leakage alarm 16 to trigger the furnace leakage alarm 16 to operate, so that the furnace leakage alarm 16 can sound an alarm more timely.

[0066] Specifically, please combine Figure 1 As shown, the nano powder preparation equipment also includes a vacuum generating device 70. The evaporating device 10, the condensing device 30, the cyclone separating device 60 and the collecting device 50 are all connected to the vacuum generating device 70. The vacuum generating device 70 is used to evacuate the interior of the evaporating device 10, the interior of the condensing device 30, the interior of the cyclone separating device 60 and the interior of the collecting device 50 to maintain the vacuum degree of the evaporating device 10, the vacuum degree of the condensing device 30, the vacuum degree of the cyclone separating device 60 and the vacuum degree of the collecting device 50 to reach the standard value.

[0067] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An efficient and controllable nano powder production device, characterized in that: The nano powder preparation equipment comprises an evaporation device, a continuous feeding device and a condensation device, wherein the evaporation device comprises a first cabin, an evaporation tube, a crucible and an induction coil both arranged in the first cabin, wherein the induction coil is arranged around the outer wall of the crucible, wherein the crucible comprises a crucible body having a heating chamber and a cover body arranged on the crucible body, wherein one end of the evaporation tube passes through the cover body and is connected to the heating chamber, and the other end of the evaporation tube passes through the cover body and is connected to the condensation device, wherein the continuous feeding device comprises a feeding cabin, a feeding pipe and a first air inlet pipe, wherein one end of the feeding pipe is connected to the feeding cabin and the other end of the feeding pipe passes through the cover body and is connected to the heating chamber, and the first air inlet pipe is connected to the feeding pipe to form a passage; The condensing device comprises a second cabin and a second air inlet pipe connected to the second cabin, the evaporating pipe is connected to the second cabin, and the second air inlet pipe is used to transport cooling medium into the second cabin; The condensing device further comprises an annular condensing nozzle disposed in the second cabin and forming an air inlet cavity therein, the second air inlet pipe is connected to the air inlet cavity of the annular condensing nozzle, the annular condensing nozzle is provided with an air jet along the peripheral wall, the air jet direction of the air jet is arranged at an acute angle to the axis of the annular condensing nozzle, so that the cooling medium sprayed from the air jet forms a conical cooling medium barrier; The condensing device is arranged on the evaporating device.

2. The efficient and controllable nano powder production equipment according to claim 1, characterized in that: The outlet end of the evaporation tube is arranged opposite to the annular condensation nozzle.

3. The efficient and controllable nano powder production equipment according to claim 1, characterized in that: A first heat insulating member is provided between the condensing device and the evaporating device.

4. The efficient and controllable nano powder production equipment according to claim 1, characterized in that: The continuous feeding device also includes a feeding mechanism, and the feeding mechanism is arranged between the feeding cabin and the feeding pipe.

5. The efficient and controllable nano powder production equipment according to claim 1, characterized in that: The nano powder preparation equipment also includes a collecting device connected to the condensing device. The collecting device includes a filtering component. The filtering component includes a first condensing member and a filter cloth. The filter cloth is coated on the first condensing member.

6. The efficient and controllable nano powder production equipment according to claim 5, characterized in that: The collecting device further comprises a filter chamber, a first collecting chamber connected to the filter chamber, and a fourth air inlet pipe connected to the first collecting chamber. The filter assembly is arranged in the filter chamber, and a second condensing element is arranged in the first collecting chamber.

7. The efficient and controllable nano powder production equipment according to claim 5, characterized in that: The nano powder preparation equipment also includes a cyclone separation device, which is connected between the condensation device and the collection device.

8. The highly efficient and controllable nano powder production device according to any one of claims 1 to 7, characterized in that: The evaporation device further comprises a tray and a furnace leakage alarm electrically connected to the induction coil. The tray is arranged in the first cabin and below the crucible. The furnace leakage alarm is arranged on the tray.

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