CN202763046U - Atomizer for manufacturing superfine metal powder - Google Patents
Atomizer for manufacturing superfine metal powder Download PDFInfo
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- CN202763046U CN202763046U CN 201220504869 CN201220504869U CN202763046U CN 202763046 U CN202763046 U CN 202763046U CN 201220504869 CN201220504869 CN 201220504869 CN 201220504869 U CN201220504869 U CN 201220504869U CN 202763046 U CN202763046 U CN 202763046U
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Abstract
An atomizer for manufacturing superfine metal powder comprises an upper nozzle and a lower nozzle which are combined with each other. The upper nozzle comprises a cone frustum and a cylindrical table, an upper nozzle arc transition section is arranged at a joint of the cone frustum and the cylindrical table, and a lead-in hole of a flow guide tube is arranged in the center of the upper nozzle; the lower nozzle comprises an inner cylindrical cavity and an inner conical cavity, the inner conical cavity is connected to the lower side of the inner cylindrical cavity, and a lower nozzle arc transition section is arranged at a joint of the inner cylindrical cavity and the inner conical cavity; a cone angle of the cone frustum is larger than a cone angle of the inner conical cavity; the cone frustum and the inner conical cavity are combined to form a gas outflow channel, the gas outflow channel comprises an inlet section, a narrowest throat and a gas flow expansion section, the inlet section is communicated with a gas inlet cavity, the narrowest throat is gradually reduced, the gas flow expansion section gradually diverges, and accordingly a gas flow channel with structural characteristics of a Laval spray pipe is formed between the gas inlet cavity and an outlet of the gas outflow channel; and the throat comprises an outer arc surface of the upper nozzle arc transition section and an outer arc surface of the lower nozzle arc transition section, the outer arc surface of the upper nozzle arc transition section is opposite to the outer arc surface of the lower nozzle arc transition section, the gas flow expansion section comprises a conical surface of the cone frustum and a conical surface of the inner conical cavity, and the central symmetric line of the throat and the central symmetric line of the gas flow expansion section of the gas outflow channel are positioned on the same straight line.
Description
Technical field
The utility model relates to and a kind ofly utilizes supersonic airstream that liquid metal is atomized into droplet and to be frozen into atomizer, the especially prepared sizes of powder fine and have an atomizer of spherical characteristic powder.
Background technology
The gas atomization technology is used for the production of metal dust, and the principle of its powder process is liquid metal stream to be ground into droplet and to be frozen into the process of powder with a high velocity air.The gas atomization powder has the advantages such as sphericity is high, powder size is controlled.
Atomizer is the core of powder by gas-atomization technology, and atomizer control air-flow is to the mechanism of metal liquid stream, and the kinetic transformation that makes air-flow is newborn powder surface energy, so this control assembly is performance and nebulization efficiency that atomizer has determined atomized powder.Improving the recovery rate of attritive powder (granularity is less than the powder of 45 μ m) and the controllability of powder, reduce the powder preparation cost, is the trend of atomizer development.
In the metal dust production practices in early days, generally adopt the free fall type atomizer.The atomizer structure of this form is simple, but nebulization efficiency is not high, is only applicable to the production of 60-300 μ m granularity powder.In order to improve nebulization efficiency, developed afterwards the restraint-type atomizer, this atomizer is greatly improved nebulization efficiency.The atomizer that modern times have industrial Practical significance mainly contains two classes: the one, and the ultrasonic atomizer (US Patent is N.4778516) of professor's Grant invention of america's MIT.Ultrasonic atomizer is combined by Lavalle (Laval) nozzle and Hartman vibrating tube, produces the pulse frequency of 80-100KHz in the supersonic airstream that produces 2-2.5M, and the particle mean size of powder can reach 40-60 μ m.The purpose of this atomizer is aluminium and the alloy that has the rapid condensation effect in order to produce, and is only applicable to the production of the metal powder with low melting points such as aluminium.The 2nd, the gases at high pressure atomizer (US Patent is N.4619845) of the people such as the Ames Lab Anderson of American I owa state university invention.Change the circumferential weld outlet of atomizer into 20-24 single spray orifice, this improvement can significantly improve nebulization efficiency.The particle mean size of powder can reach 30-50 μ m.The nebulization efficiency of this atomizer is to realize under very high pressure, and is high in industrial realization difficulty, and gas consumption is excessive, is unfavorable for the control of production cost.
Chinese patent CN1282282A discloses a kind of rectangle laminar flow atomizer, and molten metal is about 50mm from one, flows out in the conduit of wide 0.7mm, forms the Laval shape after entering nozzle, thereby produces high nebulization efficiency, and the particle mean size of powder can reach 10-20 μ m.But it is very high that this nozzle requires in technique, the one, and the degree of superheat of requirement molten metal is very high, is not suitable for for refractory metal; The 2nd, unstable being easy to of atomization process gaged somebody, and atomization process is difficult to carry out.Chinese patent CN1078928A discloses a kind of ultrasonic circular efflux atomizer, is the low-melting-point metal that under low pressure atomizes, and is not suitable for the atomizing of refractory metal, and powder size is also thicker.Chinese patent ZL200820056451.7 discloses a kind of built up nozzle, and its principal character increases by a pilot jet above main burner, produces a downward air-flow, and purpose is to reduce the ratio of satellite powder and hollow powder.Chinese patent CN1709585A discloses a high-pressure atomization nozzle, and the gas passage of this nozzle has adopted the Laval form, can obtain higher air velocity, and nebulization efficiency obviously increases.The particle mean size of refractory metal can be reduced to about 30 μ m.But the Laval runner of this nozzle is difficult to accurate processing, affects the raising of air velocity, and the jet angle that gas flow forms is only up to 45 °, and nebulization efficiency can not further improve.Chinese patent (CN2009103041661) discloses a kind of nozzle for the attritive powder atomizing, gas passage adopts the Laval form equally, because adopted the less catheter of size, and jet angle is increased to 70 °, atomizing effect is significantly improved again.Can know from existing patent and aerodynamics knowledge, adopt the gas passage of Laval form can obtain supersonic airstream, improve the kinetic energy of gas, thereby improve nebulization efficiency.Increase jet angle and can improve air-flow to the impact grinding effect of metal liquid stream, increase the energy transformation ratio of air-flow, effectively increase the productive rate of attritive powder.And existing patent is arranged also only in 70 ° jet angle.
Summary of the invention
The purpose of this utility model is in order to improve the efficient of gas atomization, to increase the recovery rate of attritive powder, a kind of atomizer with preparation refining metallic powder of supersonic airstream, higher jet angle being provided.
The utility model is that the technical scheme that its technical problem of solution adopts is: a kind of atomizer for preparing refining metallic powder, combined by top nozzle and lower nozzle two parts, form inlet chamber, throat, air-flow expansion segment after top nozzle and the combination of lower nozzle two parts; The working portion of top nozzle is comprised of an integrally formed frustum of a cone and cylinder table, and the frustum of a cone and cylinder junction are top nozzle arc transition section, and there is a mozzle entrance hole at the center of top nozzle; Lower nozzle forms by connecting a circular cone inner chamber under the cylindrical cavity, and cylindrical cavity and circular cone inner chamber junction are lower nozzle arc transition section; The cone angle span of this frustum of a cone is 60 °-90 °, and the airflow outlet end diameter span of the frustum of a cone is 12-20mm, and the cone angle span of this circular cone inner chamber is 50 °-80 °, and the cone angle of this frustum of a cone is greater than the cone angle of this circular cone inner chamber; The formation jet angle is 55 °-85 ° gas flow pass after upper cone platform and the lower cone combination of lumens, this gas flow pass comprises the entrance of the connection inlet chamber that connects successively, the narrowest throat that convergent forms and the air-flow expansion segment of dispersing gradually, thereby to forming the gas flow with Laval nozzle structure feature between the outlet of gas flow pass, the length of air-flow expansion segment is 30-50mm at inlet chamber; This throat is comprised of the relative top nozzle arc transition section in the outside and two arc surfaces of lower nozzle arc transition section, this air-flow expansion segment is comprised of two taper seats of the frustum of a cone and circular cone inner chamber, and the centre symmetry line of the throat of this gas flow pass and air-flow expansion segment point-blank.
The atomizer of above-mentioned preparation refining metallic powder uses in atomizing pressure is the 0.5-6.0MPa scope, and gas flow is 5-20m
3/ minute.
The angle that the center line of above-mentioned gas flow pass forms is jet angle, and this angle is 55 °-85 °.Because the value of angle β is greater than θ, the gas flow pass is stenosis (being throat) in the inlet chamber exit, then disperse gradually (being the air-flow expansion segment), form the passage with Laval nozzle structure feature, according to gas dynamical principle, its air stream outlet speed of jet pipe with Laval structure will reach the supersonic speed state.
The beneficial effects of the utility model are that the gas flow pass of atomizer has Laval nozzle structure feature, and the air-flow expansion segment is longer, guarantee that air-flow reaches supersonic speed to obtain high velocity air, improves nebulization efficiency; Adopt simultaneously the jet angle larger than existing atomizer further to improve air-flow to the impact grinding effect of metal liquid stream, increase considerably the productive rate of attritive powder.The utility model atomizer is applicable to fusing point in the atomizing of all metals and alloy melt below 1500 ℃.
The utility model is described in further detail below in conjunction with drawings and Examples.
Description of drawings
Fig. 1 atomizer structure figure.
Among the figure:1 top nozzle; 2 times nozzles; 3 mozzle entrance holes; 4 inlet chambers; 5 throats; 6 air-flow expansion segments; 7 times nozzle arc transition sections; 8 top nozzle arc transition sections; The joint of 9 top and the bottom.
The specific embodiment
As shown in Figure 1, the utility model prepares the atomizer of refining metallic powder, is combined by top nozzle 1 and lower nozzle 2 two parts.The working portion of top nozzle 1 is comprised of an integrally formed frustum of a cone and cylinder table, and the frustum of a cone and cylinder table junction are top nozzle arc transition section 8, and there is a mozzle entrance hole 3 at the center of top nozzle 1.Lower nozzle 2 is comprised of an integrally formed cylindrical cavity and circular cone inner chamber, and cylindrical cavity and circular cone inner chamber junction are lower nozzle arc transition section 7.Be formed with an annular groove on the cylindrical cavity wall of this time nozzle 2, forming the inlet chamber 4 that is consisted of by annular groove between the upper and lower nozzle (1,2) after top nozzle 1 and the combination of lower nozzle 2 two parts, and throat 5 and air-flow expansion segment 6.The cone angle beta span of this frustum of a cone is 60 °-90 °, the airflow outlet end diameter D span of the frustum of a cone is 12-20mm, the taper angle theta span of this circular cone inner chamber is 50 °-80 °, and the cone angle beta of this frustum of a cone is all the time greater than the taper angle theta of this circular cone inner chamber.The formation jet angle is 55 °-85 ° gas flow pass after upper cone platform and the lower cone combination of lumens, this gas flow pass comprises the narrowest throat 5 that the entrance that is communicated with inlet chamber 4, convergent form and the air-flow expansion segment 6 of dispersing gradually, thus at inlet chamber 4 to forming the gas flow with Laval nozzle structure feature between the outlet of the present utility model.The length of this air-flow expansion segment is 30-50mm; This throat 5 is comprised of the relative top nozzle arc transition section 8 in the outside and two arc surfaces of lower nozzle arc transition section 7, this air-flow expansion segment 6 is comprised of two taper seats of the frustum of a cone and circular cone inner chamber, and the centre symmetry line that makes the throat 5 of this gas flow pass and air-flow expansion segment 6 point-blank.
The atomizer that the utility model prepares refining metallic powder uses in atomizing pressure is the 0.5-6.0MPa scope, and gas flow is 5-20m
3/ minute.
The angle that the center line of this gas flow pass forms is jet angle, and this angle is 55 °-85 °.Because the value of the cone angle beta of the frustum of a cone is greater than the taper angle theta of circular cone inner chamber, the gas flow pass is stenosis (being throat) after the inlet chamber exit, then disperse gradually (being the air-flow expansion segment), form the passage with Laval nozzle structure feature, according to gas dynamical principle, its air stream outlet speed of jet pipe with Laval structure will reach the supersonic speed state.
Make further instructions below in conjunction with specific embodiment.
Example 1
Use nozzle arrangements shown in Figure 1, the cone angle of nozzle upper cone platform is 85 °, and the cone angle of lower cone inner chamber is 75 °.The external diameter of catheter is 15mm, and internal diameter is 4.0mm.Carry out the spray test of powder as the atomizing object take the 304L stainless steel, tested alloys is 50kg, and atomization temperature is 1600 ℃, and atomizing pressure is 4.5MPa.After the atomizing powder is carried out particle size determination with the standard analysis sieve, granularity is less than 150 μ m(-100 orders in the powder that atomizes) the ratio of powder be 98.0%, less than 45 μ m(-320 orders) the ratio of powder be 76.3%, less than 23 μ m(-600 orders) the ratio of powder be 60.2%, the particle mean size d of powder
50Be about 18 μ m.
Example 2
Use nozzle arrangements shown in Figure 1, the cone angle of nozzle upper cone platform is 85 °, and the cone angle of lower cone inner chamber is 75 °.The external diameter of catheter is 15mm, and internal diameter is 4.0mm.Carry out the spray test of powder as the atomizing object take the 17-4ph stainless steel, tested alloys is 50kg, and atomization temperature is 1580 ℃, and atomizing pressure is 4.5MPa.After the atomizing powder is carried out particle size determination with the standard analysis sieve, granularity is less than 150 μ m(-100 orders in the powder that atomizes) the ratio of powder be 98.5%, less than 45 μ m(-320 orders) the ratio of powder be 81.0%, less than 23 μ m(-600 orders) the ratio of powder be 65.3%, the particle mean size d of powder
50Be about 15 μ m.
Example 3
Use nozzle arrangements shown in Figure 1, the cone angle of nozzle upper cone platform is 75 °, and the cone angle of lower cone inner chamber is 65 °.The external diameter of catheter is 15mm, and internal diameter is 4.0mm.Carry out the spray test of powder as the atomizing object take the 316L stainless steel, tested alloys is 50kg, and atomization temperature is 1600 ℃, and atomizing pressure is 4.5MPa.After the atomizing powder is carried out particle size determination with the standard analysis sieve, granularity is less than 150 μ m(-100 orders in the powder that atomizes) the ratio of powder be 96.5%, less than 45 μ m(-320 orders) the ratio of powder be 70.8%, less than 23 μ m(-600 orders) the ratio of powder be 56.5%, the particle mean size d of powder
50Be about 22 μ m.
Example 4
Use nozzle arrangements shown in Figure 1, the cone angle of nozzle upper cone platform is 75 °, and the cone angle of lower cone inner chamber is 65 °.The external diameter of catheter is 15mm, and internal diameter is 4.0mm.Carry out the spray test of powder as the atomizing object take the Fe-6wt%Si alloy, tested alloys is 100kg, and atomization temperature is 1550 ℃, and atomizing pressure is 4.5MPa.After the atomizing powder is carried out particle size determination with the standard analysis sieve, granularity is less than 150 μ m(-100 orders in the powder that atomizes) the ratio of powder be 95.8%, less than 45 μ m(-320 orders) the ratio of powder be 73.4%, less than 23 μ m(-600 orders) the ratio of powder be 58.5%, the particle mean size d of powder
50Be about 20 μ m.
Example 5
Use nozzle arrangements shown in Figure 1, the cone angle of nozzle upper cone platform is 85 °, and the cone angle of lower cone inner chamber is 55 °, and the external diameter of catheter is 12mm, and internal diameter is 4.0mm.Carry out the spray test of powder as the atomizing object take Cu-10wt%Sn-10wt%Ti, tested alloys is 50kg, and atomization temperature is 1000 ℃, and atomizing pressure is 4.0MPa.After the atomizing powder is carried out particle size determination with the standard analysis sieve, granularity is less than 150 μ m(-100 orders in the powder that atomizes) the ratio of powder be 99.5%, less than 45 μ m(-320 orders) the ratio of powder be 86.3%, less than 23 μ m(-600 orders) the ratio of powder be 75.0%, the particle mean size d of powder
50Be about 12 μ m.
Claims (2)
1. atomizer for preparing refining metallic powder, combined by top nozzle (1) and lower nozzle (2) two parts, it is characterized in that, form inlet chamber (4), throat (5), air-flow expansion segment (6) after top nozzle (1) and the combination of lower nozzle (2) two parts; The working portion of top nozzle (1) is comprised of an integrally formed frustum of a cone and cylinder table, and the frustum of a cone and cylinder junction are top nozzle arc transition section (8), and there is a mozzle entrance hole (3) at the center of top nozzle (1); Lower nozzle forms by connecting a circular cone inner chamber under the cylindrical cavity, and cylindrical cavity and circular cone inner chamber junction are lower nozzle arc transition section (7); The cone angle span of this frustum of a cone is 60 °-90 °, and the airflow outlet end diameter span of the frustum of a cone is 12-20mm, and the cone angle span of this circular cone inner chamber is 50 °-80 °, and the cone angle of this frustum of a cone is greater than the cone angle of this circular cone inner chamber; The formation jet angle is 55 °-85 ° gas flow pass after upper cone platform and the lower cone combination of lumens, this gas flow pass comprises the entrance of the connection inlet chamber (4) that connects successively, the narrowest throat (5) that convergent forms and the air-flow expansion segment (6) of dispersing gradually, thereby to forming the gas flow with Laval nozzle structure feature between the outlet of gas flow pass, the length of air-flow expansion segment is 30-50mm at inlet chamber (4); This throat (5) is comprised of the relative top nozzle arc transition section (8) in the outside and two arc surfaces of lower nozzle arc transition section (7), this air-flow expansion segment (6) is comprised of two taper seats of the frustum of a cone and circular cone inner chamber, and the centre symmetry line of the throat of this gas flow pass and air-flow expansion segment point-blank.
2. a kind of atomizer for preparing refining metallic powder according to claim 1 is characterized in that, atomizing pressure uses in the 0.5-6.0MPa scope, and gas flow is 5-20m
3/ minute.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220504869 CN202763046U (en) | 2012-09-29 | 2012-09-29 | Atomizer for manufacturing superfine metal powder |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220504869 CN202763046U (en) | 2012-09-29 | 2012-09-29 | Atomizer for manufacturing superfine metal powder |
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| CN202763046U true CN202763046U (en) | 2013-03-06 |
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ID=47769649
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| CN 201220504869 Expired - Lifetime CN202763046U (en) | 2012-09-29 | 2012-09-29 | Atomizer for manufacturing superfine metal powder |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103273070A (en) * | 2013-06-03 | 2013-09-04 | 南京雷瑞新材料科技有限公司 | Adjustable ultra-fine atomizing nozzle for titanium and titanium alloy melt |
| CN103658667A (en) * | 2013-11-14 | 2014-03-26 | 江苏博迁新材料有限公司 | Atomizer for preparing fine metal powder body |
| CN104858442A (en) * | 2015-06-09 | 2015-08-26 | 湖南省冶金材料研究院 | Blocking-preventing nozzle device used for preparing metal powder through gas atomization method |
| CN108714697A (en) * | 2018-07-02 | 2018-10-30 | 南京理工大学 | A kind of aerosolization nozzle being used to prepare metal powder |
| CN109570518A (en) * | 2019-01-22 | 2019-04-05 | 上海材料研究所 | A kind of supersonic gas atomization spray disk for metal powder preparation |
| CN109806988A (en) * | 2019-04-13 | 2019-05-28 | 江苏华威机械制造有限公司 | A kind of metal bath jet deposition atomizer for preventing dross from gaging somebody |
| CN110480023A (en) * | 2019-09-06 | 2019-11-22 | 飞而康快速制造科技有限责任公司 | Manufacture powder atomizer and nozzle and manufacture powder atomization method |
-
2012
- 2012-09-29 CN CN 201220504869 patent/CN202763046U/en not_active Expired - Lifetime
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103273070A (en) * | 2013-06-03 | 2013-09-04 | 南京雷瑞新材料科技有限公司 | Adjustable ultra-fine atomizing nozzle for titanium and titanium alloy melt |
| CN103273070B (en) * | 2013-06-03 | 2015-08-05 | 南京雷瑞新材料科技有限公司 | A kind of adjustable titanium or titanium alloy liquation ultra-fine atomization spray nozzle |
| CN103658667A (en) * | 2013-11-14 | 2014-03-26 | 江苏博迁新材料有限公司 | Atomizer for preparing fine metal powder body |
| CN103658667B (en) * | 2013-11-14 | 2017-01-04 | 江苏博迁新材料有限公司 | One prepares fine metal powder body nebulizer |
| CN104858442A (en) * | 2015-06-09 | 2015-08-26 | 湖南省冶金材料研究院 | Blocking-preventing nozzle device used for preparing metal powder through gas atomization method |
| CN108714697A (en) * | 2018-07-02 | 2018-10-30 | 南京理工大学 | A kind of aerosolization nozzle being used to prepare metal powder |
| CN109570518A (en) * | 2019-01-22 | 2019-04-05 | 上海材料研究所 | A kind of supersonic gas atomization spray disk for metal powder preparation |
| CN109570518B (en) * | 2019-01-22 | 2022-07-08 | 上海材料研究所 | Supersonic gas atomization spray disk for metal powder preparation |
| CN109806988A (en) * | 2019-04-13 | 2019-05-28 | 江苏华威机械制造有限公司 | A kind of metal bath jet deposition atomizer for preventing dross from gaging somebody |
| CN109806988B (en) * | 2019-04-13 | 2023-10-03 | 江苏华威机械制造有限公司 | Molten metal jet deposition atomizer capable of preventing nodulation and nozzle blockage |
| CN110480023A (en) * | 2019-09-06 | 2019-11-22 | 飞而康快速制造科技有限责任公司 | Manufacture powder atomizer and nozzle and manufacture powder atomization method |
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Granted publication date: 20130306 |
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