CN202845789U - Fine metal powder atomizing nozzle enabling metal liquid flow to easily flow out - Google Patents
Fine metal powder atomizing nozzle enabling metal liquid flow to easily flow out Download PDFInfo
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- CN202845789U CN202845789U CN 201220504931 CN201220504931U CN202845789U CN 202845789 U CN202845789 U CN 202845789U CN 201220504931 CN201220504931 CN 201220504931 CN 201220504931 U CN201220504931 U CN 201220504931U CN 202845789 U CN202845789 U CN 202845789U
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Abstract
A fine metal powder atomizing nozzle enabling metal liquid flow to easily flow out is formed by a first assembly and a second assembly through combination. The lower end of a cylinder platform is connected with a circular truncated cone to form the first assembly. A liquid guide tube is arranged at the center of the first assembly. The lower end of an inner cavity of the cylindrical is connected with an inner cavity of the circular truncated cone to form the second assembly. An annular groove is arranged in the wall of the inner cavity of the cylinder platform. A horizontal circular ring face and an inner arc-shaped rotating body which are sequentially connected are arranged at the joint between the cylinder platform and the circular truncated cone. A horizontal circular ring face and an outer arc-shaped rotating body which are sequentially connected are arranged at the joint between the inner cavity of the cylinder platform and the inner cavity of the circular truncated cone. The annular groove forms an air inlet cavity. A three-section type Laval gas channel is formed between the first assembly and the second assembly. A first section is a horizontal air inlet contraction section formed by the horizontal circular ring face of the first assembly and the horizontal circular ring face of the second assembly. A second section is an arc-shaped expansion section formed by the inner arc-shaped rotating body of the first assembly and the outer arc-shaped rotating body of the second assembly. A third section is a linear type expanding section formed by the circular truncated cone of the first assembly and the inner cavity of the circular truncated cone of the second assembly.
Description
Technical field
The utility model relates to a kind of atomizer that utilizes supersonic airstream that liquid metal is atomized into droplet and be frozen into powder, the refining metallic powder atomizer that especially a kind of metal liquid stream easily flows out.
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 has determined performance and the nebulization efficiency of 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.
Can know from existing patent and document analysis, the technical characterictic of atomizer mainly contains annular distance type and ring-crack ventilation, the air stream outlet that is atomizer is the very little slit circle of opening that a plurality of apertures that are circle distribution form or distribute with the circumference type, air-flow is out rear to be focused on a bit with certain angle, metal liquid stream flows out from the central point of atomizer, is atomized into powder at the focus place of air-flow.Annular distance type atomizer structure is simple, is easy to processing, but efficient lower (such as US Patent No. 4778516, US 4619845); And ring-crack ventilation efficient is high, and machining accuracy is high (such as Chinese patent CN1078928A, CN1709585A, CN2009103041661) also, and the use of these two kinds of atomizers is according to the granularity of powder and production capacity and decide.But in order to improve nebulization efficiency, some atomizers are designed to Laval jet pipe form (such as Chinese patent CN1709585A, CN2009103041661) with airflow path, so that air stream outlet speed reaches ultrasonic sound.
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.In order to realize the atomization process of metal bath, also need a ceramic mozzle that liquid metal is imported atomizer.But because the confidentiality of patent, these existing patents are not all made an explanation to the concrete structure of atomizer, especially the length of mozzle in nozzle.Show according to existing knowledge and experience, the length of catheter has important impact to the stability of atomization process, especially dystectic metal, and long catheter (as surpassing 30mm) will bring a lot of problems to the stability of atomizing.The catheter of the atomizer that general industry uses is not direct-firedly (directly to heat more complicated, influential to nozzle), but the radiation heating of dependence tundish, long catheter will cause radiation temperature inadequate, the outlet temperature of catheter is not high, is easy to cause gag somebody and stop.Adopt long catheter often to cause melt to be difficult to flow down to refractory metal, the success rate of atomizing is not high, in the industrial practice often the latus rectum by the increase catheter (as be increased to 6mm or more than) to address this problem.Although can solving, the increase latus rectum gags somebody and the cutout problem, but can significantly increase simultaneously the size of flow and the atomizer of metal bath, this efficient that can cause atomizing obviously descends, the obvious alligatoring of the granularity of powder, therefore in the situation of the tiny powder of prepared sizes, this method is worthless.
Analyzing existing patent shows, the gas flow that adopts the Laval form is the precondition that improves nebulization efficiency, according to gas dynamical relevant knowledge, in order to obtain high gas flow speed, the maximum of the expansion segment of Laval pipe and the ratio of minimum sectional area are 3～4, because the air-flow of atomizer all intersects at the atomizing point with certain angle (being generally less than 60 °), for the disorder that the reduces air-flow adverse effect to the range of atomization, therefore the distance of straightway is longer, generally reach more than the 20mm, the expansion segment of existing patent is linear pattern, this will cause total thickness of nozzle not reduce, at least to reach more than the 50mm, must cause the length of catheter greater than 50mm, this is that be unfavorable for atomizing stable carries out the preparation with attritive powder, needs the complete different nozzle of structure, both had the Laval gas channel, and can significantly shorten again the length of catheter simultaneously.
Summary of the invention
The purpose of this utility model provide a kind ofly have supersonic airstream, nebulization efficiency is high, and the refining metallic powder atomizer that metal liquid stream easily flows out, it can shorten the length of catheter simultaneously, overcome and gag somebody and stop phenomenon, thereby powder, especially the refractory metal powder of producing fine particle size for atomizing provide a solution.
The utility model is that the technical scheme that its technical problem of solution adopts is: the refining metallic powder atomizer that a kind of metal liquid stream easily flows out, combined by the first assembly and the second assembly, this first assembly is comprised of integrally formed a cylinder table and a frustum of a cone from top to bottom, the center of this first assembly arranges catheter, the second assembly forms by connecting a circular cone inner chamber under the cylindrical cavity, the cylindrical cavity wall of this second assembly is formed with an annular groove, this annular groove is connected with external air source through admission line, this cylinder table and frustum of a cone junction are a horizontal circle anchor ring and an arc rotary body that is linked in sequence, and this cylindrical cavity and circular cone inner chamber junction are a horizontal circle anchor ring and an outer arcuate rotary body that is linked in sequence; After the first assembly and the combination of the second assembly, this annular groove consists of an inlet chamber, forms the Laval gas passage between this first assembly and the second assembly; This Laval gas passage forms by three sections, first paragraph is the horizontal air inlet contraction section that the horizontal circle anchor ring of first and second assembly forms, back to back second segment is the arc expansion segment that the outer arcuate rotary body by the arc rotary body of the first assembly and the second assembly forms, and the 3rd section of following again is the linear pattern expansion segment that is certain taper that the circular cone inner chamber by the frustum of a cone of the first assembly and the second assembly forms; This horizontal air inlet contraction section forms the contraction section of Laval gas passage, the junction of this horizontal air inlet contraction section and arc expansion segment forms the throat of Laval gas passage, arc expansion segment and straight line expansion segment form the expansion segment of Laval gas passage, so just formed a Laval nozzle structure completely, and then determine the expansion segment length of Laval gas passage with reference to the requirement of Laval nozzle structure, existence by the arc expansion segment reduces the thickness of atomizer, thereby shortens catheter.
Further being improved to of such scheme, the angle that the center line of this straight line expansion segment forms is the jet angle of atomizing, the angle of this jet angle is 20 °～60 °.
Further being improved to of such scheme, the span of the cone angle of this frustum of a cone are 20 °-80 °, and the span of the cone angle of this circular cone inner chamber is 15 °～70 °, and the cone angle of this frustum of a cone makes the straight line expansion segment be the expansion shape greater than the cone angle of this circular cone inner chamber; The length of this straight line expansion segment is 3-8mm, and the thickness of this atomizer is less than or equal to 30mm, and the length of this catheter is less than or equal to 30mm.
The beneficial effects of the utility model are: the gas flow of the utility model atomizer has Laval nozzle structure feature, expansion segment length can be with reference to the requirement design of Laval nozzle structure, guarantee that air-flow reaches supersonic speed to obtain high velocity air, improves nebulization efficiency; Adopt simultaneously the arc expansion segment can reduce the height (thickness) of nozzle, effectively reduce the length of catheter, significantly increase the stability of atomizing, and overcome the phenomenon of gaging somebody.Because the length of catheter of the present utility model can be down in the 30mm, thereby the utility model atomizer is applicable to fusing point in the atomizing of all metals and alloy melt below 1600 ℃.
The utility model is described in further detail below in conjunction with drawings and Examples.
Description of drawings
Fig. 1 is the atomizing nozzle structure schematic diagram.
Symbol description among the figure:
1 first assembly;
2 second assemblies;
3 inlet chambers;
4 admission lines;
5 horizontal air inlet contraction sections;
6 arc expansion segments;
7 straight line expansion segments;
8 catheters;
L thickness;
The φ diameter;
The β cone angle;
The γ cone angle;
The α jet angle.
The specific embodiment
As shown in Figure 1, the easy refining metallic powder atomizer that flows out of the utility model metal liquid stream is combined by the first assembly 1 and the second assembly 2 two parts.The first assembly 1 is comprised of integrally formed a cylinder table and a frustum of a cone from top to bottom, this cylinder table and frustum of a cone junction are a horizontal circle anchor ring and the arc rotary body that is linked in sequence, the center of this first assembly 1 is provided with a through hole, is used for placing catheter 8.The second assembly 2 is comprised of an integrally formed cylindrical cavity and circular cone inner chamber, and cylindrical cavity and circular cone inner chamber junction are a horizontal circle anchor ring and the outer arcuate rotary body that is linked in sequence.The cylindrical cavity wall of this second assembly 2 is formed with an annular groove, and this annular groove is connected with external air source through admission line 4.After the first assembly 1 and 2 combinations of the second assembly, this annular groove consists of an inlet chamber 3; Form long and narrow Laval gas passage between this first assembly 1 and the second assembly 2, this Laval gas passage forms by three sections, one section is the horizontal air inlet contraction section 5 that first and second assembly 1,2 horizontal circle anchor ring form, and then being one section arc expansion segment 6 that is formed by the outer arcuate rotary body of the arc rotary body of the first assembly 1 and the second assembly 2, then is the linear pattern expansion segment 7 that is certain taper that the circular cone inner chamber by the frustum of a cone of the first assembly 1 and the second assembly 2 forms again.This horizontal air inlet contraction section 5 forms the contraction section of Laval gas passage, the junction of this horizontal air inlet contraction section 5 and arc expansion segment 6 forms the throat of Laval gas passage, throat is following to be the expansion segment of Laval gas passage, the expansion segment of Laval gas passage herein is comprised of arc expansion segment 6 and straight line expansion segment 7, so just can design the length of Laval gas passage expansion segment fully according to the requirement of Laval pipe, and since the existence of arc expansion segment 6 the thickness L of atomizer is significantly reduced, thereby reach the purpose that shortens catheter 8, and this straight line expansion segment 7 can focus on air-flow the atomizing point.
The angle that the center line of this straight line expansion segment 7 forms is the jet angle α of atomizing, and this angle is 20 °～60 °.The span of the cone angle beta of this frustum of a cone is 20 °-80 °, and the span of the cone angle gamma of this circular cone inner chamber is 15 °～70 °, and the cone angle beta of this frustum of a cone makes straight line expansion segment 7 be the expansion shape all the time greater than the cone angle gamma of this circular cone inner chamber.The length of this straight line expansion segment is generally 3-8mm.Because the length of straight line expansion segment significantly reduces, the thickness L of atomizer also significantly is decreased in the 30mm, even 20mm, the length of catheter 8 is corresponding like this is reduced in the 30mm, so both reached the feature request of Laval gas passage, the length of catheter 8 can be significantly reduced again, thereby gaging somebody and wild effect of atomizer can be effectively overcome.
The utility model atomizer is applicable to fusing point in the atomizing of all metals and alloy melt below 1600 ℃.
The below illustrates the technique effect that the utility model is brought with specific embodiment.
Example 1
Use nozzle arrangements shown in Figure 1,55 ° of jet angles, straight line expansion segment length 5mm, the external diameter φ of catheter 8 is 15mm, and internal diameter is 4.0mm, and the length in nozzle is 30mm.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 95.0%, less than 45 μ m(-320 orders) the ratio of powder be 69.3%, less than 23 μ m(-600 orders) the ratio of powder be 53.2%, the particle mean size d of powder
50Be about 20 μ m.
Example 2
Use nozzle arrangements shown in Figure 1,50 ° of jet angles, straight line expansion segment length 3mm, the external diameter of catheter is 15mm, and internal diameter is 4.0mm, and the length in nozzle is 25mm.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 95.5%, less than 45 μ m(-320 orders) the ratio of powder be 75.0%, less than 23 μ m(-600 orders) the ratio of powder be 62.3%, the particle mean size d of powder
50Be about 18 μ m.
Example 3
Use nozzle arrangements shown in Figure 1,60 ° of jet angles, straight line expansion segment length 5mm, the external diameter of catheter is 15mm, and internal diameter is 4.5mm, and the length in nozzle is 25mm.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 93.5%, 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 1,55 ° of jet angles, straight line expansion segment length 6mm, the external diameter of catheter is 14mm, and internal diameter is 4.5mm, and the length in nozzle is 26mm.Carry out the spray test of powder as the atomizing object take the Fe-6.5wt%Si alloy, tested alloys is 100kg, 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 96.8%, 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 59.5%, the particle mean size d of powder
50Be about 19 μ m.
Claims (3)
1. the refining metallic powder atomizer that easily flows out of a metal liquid stream, combined by the first assembly and the second assembly, this first assembly is comprised of integrally formed a cylinder table and a frustum of a cone from top to bottom, the center of this first assembly arranges catheter, the second assembly forms by connecting a circular cone inner chamber under the cylindrical cavity, the cylindrical cavity wall of this second assembly is formed with an annular groove, this annular groove is connected with external air source through admission line, it is characterized in that, this cylinder table and frustum of a cone junction are a horizontal circle anchor ring and an arc rotary body that is linked in sequence, and this cylindrical cavity and circular cone inner chamber junction are a horizontal circle anchor ring and an outer arcuate rotary body that is linked in sequence; After the first assembly and the combination of the second assembly, this annular groove consists of an inlet chamber, forms the Laval gas passage between this first assembly and the second assembly; This Laval gas passage forms by three sections, first paragraph is the horizontal air inlet contraction section that the horizontal circle anchor ring of first and second assembly forms, back to back second segment is the arc expansion segment that the outer arcuate rotary body by the arc rotary body of the first assembly and the second assembly forms, and the 3rd section of following again is the linear pattern expansion segment that is certain taper that the circular cone inner chamber by the frustum of a cone of the first assembly and the second assembly forms; This horizontal air inlet contraction section forms the contraction section of Laval gas passage, the junction of this horizontal air inlet contraction section and arc expansion segment forms the throat of Laval gas passage, arc expansion segment and straight line expansion segment form the expansion segment of Laval gas passage, so just formed a Laval nozzle structure completely, and then determine the expansion segment length of Laval gas passage with reference to the requirement of Laval nozzle structure, existence by the arc expansion segment reduces the thickness of atomizer, thereby shortens catheter.
2. the easy refining metallic powder atomizer that flows out of a kind of metal liquid stream according to claim 1 is characterized in that, the angle that the center line of this straight line expansion segment forms is the jet angle of atomizing, and the angle of this jet angle is 20 °～60 °.
3. the refining metallic powder atomizer that easily flows out of a kind of metal liquid stream according to claim 1 and 2, it is characterized in that, the span of the cone angle of this frustum of a cone is 20 °-80 °, the span of the cone angle of this circular cone inner chamber is 15 °～70 °, and the cone angle of this frustum of a cone makes the straight line expansion segment be the expansion shape greater than the cone angle of this circular cone inner chamber; The length of this straight line expansion segment is 3-8mm, and the thickness of this atomizer is less than or equal to 30mm, and the length of this catheter is less than or equal to 30mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220504931 CN202845789U (en) | 2012-09-29 | 2012-09-29 | Fine metal powder atomizing nozzle enabling metal liquid flow to easily flow out |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220504931 CN202845789U (en) | 2012-09-29 | 2012-09-29 | Fine metal powder atomizing nozzle enabling metal liquid flow to easily flow out |
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| Publication Number | Publication Date |
|---|---|
| CN202845789U true CN202845789U (en) | 2013-04-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220504931 Expired - Lifetime CN202845789U (en) | 2012-09-29 | 2012-09-29 | Fine metal powder atomizing nozzle enabling metal liquid flow to easily flow out |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102837001A (en) * | 2012-09-29 | 2012-12-26 | 湖南恒基粉末科技有限责任公司 | Fine metal powder atomizing spray nozzle with molten metal easily flowing out |
-
2012
- 2012-09-29 CN CN 201220504931 patent/CN202845789U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102837001A (en) * | 2012-09-29 | 2012-12-26 | 湖南恒基粉末科技有限责任公司 | Fine metal powder atomizing spray nozzle with molten metal easily flowing out |
| CN102837001B (en) * | 2012-09-29 | 2013-07-03 | 湖南恒基粉末科技有限责任公司 | Fine metal powder atomizing spray nozzle with molten metal easily flowing out |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130403 |
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| CX01 | Expiry of patent term |