CN213257110U - Gas atomizing nozzle and atomizing device - Google Patents
Gas atomizing nozzle and atomizing device Download PDFInfo
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- CN213257110U CN213257110U CN202021702495.XU CN202021702495U CN213257110U CN 213257110 U CN213257110 U CN 213257110U CN 202021702495 U CN202021702495 U CN 202021702495U CN 213257110 U CN213257110 U CN 213257110U
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Abstract
The utility model provides an air atomization nozzle and an atomization device, the air atomization nozzle comprises a cavity upper end cover and a cavity lower end cover, the cavity upper end cover is cylindrical, and one end of the cavity upper end cover is provided with an opening; the lower end cover of the cavity is disc-shaped and covers the opening of the upper end cover of the cavity, and an air cavity is formed between the upper end cover of the cavity and the lower end cover of the cavity; the middle part of the upper end cover of the cavity is provided with a funnel-shaped molten metal inlet, the middle part of the excircle side wall of the upper end cover of the cavity is provided with two air inlets which are respectively communicated with the air cavity, and the two air inlets are arranged in axial symmetry; and a Laval-shaped air outlet with a ring hole and a ring slit matched with each other is formed between the bottom position of the inner wall of the upper end cover of the cavity and the lower end cover of the cavity. The gas atomization nozzle integrates the atomization advantages of the annular hole atomizer and the annular slit atomizer, effectively improves the atomization efficiency, obviously improves the powder yield and morphology, and is particularly suitable for atomizing metal materials with high viscosity, small superheat degree and easy segregation.
Description
Technical Field
The utility model relates to a metal gas atomization technical field, concretely relates to gas atomization nozzle and atomizing device.
Background
The inert gas atomization method is a process of crushing liquid metal flow into small liquid drops by using high-speed airflow and solidifying the small liquid metal drops into powder, and the prepared powder has the advantages of high purity, low oxygen content, controllable powder granularity, low production cost, high sphericity and the like, and is the main development direction of the preparation technology of high-performance and special alloy powder. In the gas atomization powder making process, an atomizer is used as an energy converter to convert mechanical energy of high-pressure gas and heat energy provided by a smelting furnace to surface energy of metal, the energy conversion efficiency directly determines the atomization efficiency, and meanwhile, the atomization device plays an important stability role in the whole atomization process and determines key technical indexes such as the granularity, the distribution range, the morphology, the yield and the like of metal powder.
At present, the gas atomization device has a plurality of design types, and key process parameters such as a nozzle structure, the size and the position of a flow guide pipe, a gas inlet and outlet structure and the like are optimized on the premise of ensuring that inert gas obtains higher energy and speed, the interaction between an atomization medium and molten metal is improved, the gas utilization rate is improved, and the relation between the optimal atomization process parameter and the powder characteristic is obtained. According to the gas outlet mode of the atomizer, the structure mainly comprises two structures: annular slit and annular ring type structures. For the annular slit atomizer, after airflow is sprayed out from the annular seam, a closed atomization area is formed, the airflow in the atomization area is disordered, the atomizer is easily blocked, and even the phenomenon of back spraying is caused, so that the atomization process is interrupted. Meanwhile, the turbulent gas flow field can cause collision among the atomized particles, and then satellite powder is formed. Meanwhile, the metal liquid column is sheared by the airflow, so that tiny metal sheets are easily formed.
Annular slit atomizer compares complicacy, and there is the less aperture of an annular diameter bottom the air cavity, and quantity is about 18 ~ 24, because hole central air velocity is higher, and is better to metal liquid column crushing effect, is applicable to the metal solution that the atomizing superheat degree is lower or viscosity is high, and the metal powder sphericity of acquisition is better, and the difficult emergence of semi-closed type atomizer blocks up moreover. However, because the atomization area is semi-closed, the atomized large-size metal droplets are brought out of the atomization area by the airflow and cannot be effectively crushed again in time, so that the large-size particles of the metal powder are more, and the powder yield is low. Meanwhile, the metal liquid drop is influenced by the size, the cooling speed is low, and the defects of coarse microstructure, element segregation and the like are easily caused.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a gas atomization nozzle and atomizing device, this gas atomization nozzle's gas outlet sets up to the Laval spray tube structure of hole and circumferential weld interfitting, has fused the annular ring and the atomizing advantage of annular slit atomizer, reduces the gas cost for the atomizing, effectively improves atomization efficiency, reduces satellite powder, hollow powder and small foil, is showing and is improving powder yield and appearance to solve among the prior art atomizer atomization inefficiency and the poor technical problem of powder sphericity.
In order to achieve the above object, according to a first aspect of the present invention, there is provided an aerosolization nozzle.
This gas atomizing nozzle includes cavity upper end cover and cavity lower extreme cover, wherein:
the upper end cover of the cavity is cylindrical, and one end of the upper end cover is provided with an opening; the cavity lower end cover is disc-shaped, the cavity lower end cover is covered at an opening of the cavity upper end cover, and an air cavity is formed between the cavity upper end cover and the cavity lower end cover;
the middle part of the upper end cover of the cavity is provided with a funnel-shaped molten metal inlet, the middle part of the excircle side wall of the upper end cover of the cavity is provided with two air inlets which are respectively communicated with the air cavity, and the two air inlets are arranged in axial symmetry; and a Laval-shaped air outlet with a ring hole and a ring slit matched with each other is formed between the bottom position of the inner wall of the upper end cover of the cavity and the lower end cover of the cavity.
Further, the cavity lower end cover is towards being close to one side of cavity upper end cover is sunken, and its middle part has a through-hole structure, cavity upper end cover inner wall bottom position is extended along its circumference and is formed annular boss structure, annular boss structure with form between the through-hole structure the gas outlet.
Furthermore, at least one first circular arc-shaped groove which is communicated up and down is formed in the inner side wall of the through hole structure along the thickness direction of the side wall; the annular boss structure is provided with at least one second circular arc-shaped groove which is communicated up and down along the boss thickness direction, and the first circular arc-shaped groove and the second circular arc-shaped groove are fitted with each other to form the annular hole.
Furthermore, a plurality of first circular arc-shaped grooves are arranged, and the plurality of first circular arc-shaped grooves are arranged along the circumferential direction of the through hole structure; the second circular arc-shaped grooves are arranged in a plurality of numbers, and the second circular arc-shaped grooves are arranged along the circumferential direction of the annular boss structure.
Furthermore, the distance between the center line of the annular hole and the center line of the annular slit is 0-5 mm, and the diameter of the center line of the annular slit is larger than or equal to that of the center line of the annular hole.
Furthermore, the diameter of the annular hole is 1-5 mm, and the width of the annular slit is 1-5 mm.
Furthermore, the included angle between the central line of the ring hole and the central line of the funnel-shaped molten metal inlet is alpha1，α 110 to 40 degrees; the included angle between the central line of the annular slit and the central line of the funnel-shaped molten metal inlet is alpha2，α 210 to 40 DEG, and alpha1＜α2。
Furthermore, a connecting groove is formed in one side, facing the upper end cover of the cavity, of the lower end cover of the cavity along the circumferential direction of the lower end cover; and a connecting plug block is formed on the side wall of the opening of the upper end cover of the cavity along the circumferential direction of the side wall, and the connecting plug block is spliced with the connecting groove and is in sealing connection with the connecting groove through a sealing ring.
In order to achieve the above object, according to a second aspect of the present invention, there is provided an atomizing device.
The atomizing device comprises the gas atomizing nozzle. The atomization device can be used for preparing metal spherical powder by gas atomization.
The utility model discloses possess following advantage:
1. the utility model discloses well gas atomizing nozzle has fused the annular ring and has atomized the advantage with annular slit atomizer, effectively improves atomization efficiency, reduces gas energy loss, reduces satellite powder, hollow powder and small foil, is showing improvement powder yield and appearance.
2. The utility model discloses full play uses the annular ring to be main crushing process, and annular slit is secondary crushing process, and atomization efficiency is high, and atomization process is difficult for blockking, is applicable to the metal material that atomizing viscosity is high, the superheat degree is little, easy segregation.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a schematic structural view of an atomizing nozzle according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view of FIG. 1;
fig. 3 is a schematic structural view of an upper end cover of a cavity in an embodiment of the present invention;
fig. 4 is a schematic structural view of a lower end cover of the cavity in the embodiment of the present invention;
fig. 5 is a partially enlarged view of fig. 1.
In the figure:
1. an upper end cover of the cavity; 2. a lower end cover of the cavity; 3. a funnel-shaped molten metal inlet; 4. an air cavity; 5. an air outlet; 6. annular ring; 7. an annular slit; 8. an air inlet; 9. a via structure; 10. a first arc-shaped groove; 11. a second arc-shaped groove; 12. a connecting groove; 13. Connecting the plug blocks; 14. and (5) sealing rings.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
The utility model discloses an atomizing nozzle, as shown in fig. 1 ~ 4, this atomizing nozzle includes cavity upper end cover 1 and cavity lower extreme cover 2, wherein: the upper end cover 1 of the cavity is cylindrical, and one end of the upper end cover is provided with an opening; the cavity lower end cover 2 is disc-shaped, the cavity lower end cover 2 is covered at the opening of the cavity upper end cover 1, and an air cavity 4 is formed between the cavity upper end cover 1 and the cavity lower end cover 2; the middle part of the upper end cover 1 of the cavity is provided with a funnel-shaped molten metal inlet 3, the middle part of the excircle side wall of the upper end cover 1 of the cavity is provided with two air inlets 8 which are respectively communicated with the air cavity 4, and the two air inlets 8 are arranged in axial symmetry; an annular hole 6 and an annular slit 7 are formed between the bottom end position of the inner wall of the cavity upper end cover 1 and the cavity lower end cover 2, a Laval-type gas outlet 5 is matched with each other, the gas outlet 5 formed by matching integrates the advantages of an annular hole and an annular slit atomizer, the atomization efficiency is effectively improved, and the powder yield and morphology are remarkably improved.
As another embodiment of the utility model, combine fig. 2 and fig. 4 to show, cavity lower extreme cover 2 is sunken towards one side that is close to cavity upper end cover 1 to cavity lower extreme cover 2 middle part has through- hole structure 9, and 1 inner wall bottom position of cavity upper end cover forms annular boss structure along its circumference epitaxy, as shown in fig. 3, forms the Laval type gas outlet 5 of annular ring 6 and the mutual fit of annular slit 7 between annular boss structure and the through-hole structure 9.
As another embodiment of the present invention, one side of the lower end cap 2 of the disc-shaped cavity facing the upper end cap 1 of the cavity is recessed downwards along the circumferential direction thereof to form a connecting groove 12, as shown in fig. 4; a connecting insert 13 is formed on the side wall of the opening of the upper end cover 1 of the cavity along the circumferential direction, as shown in fig. 3, the connecting insert 13 is inserted into the connecting groove 12, the upper end cover 1 of the cavity is connected with the lower end cover 2 of the cavity in a matching way, and the connecting insert 13 and the connecting groove 12 are sealed by a sealing ring 14, so that an air cavity 4 is formed among the upper end cover 1 of the cavity, the lower end cover 2 of the cavity and the outer side wall of the funnel-shaped molten metal inlet 3.
As another embodiment of the present invention, the inner sidewall of the through-hole structure 9 is provided with a first circular arc-shaped groove 10 running through from top to bottom along the thickness direction thereof, as shown in fig. 4, one or more first circular arc-shaped grooves 10 may be provided, which may be selected according to actual conditions; the annular boss structure is provided with a second circular arc-shaped groove 11 which is penetrated up and down along the boss thickness direction, as shown in fig. 3, one or more second circular arc-shaped grooves 11 can be arranged and can be selected according to actual conditions; the first circular arc-shaped groove 10 and the second circular arc-shaped groove 11 are fitted to form the annular hole 6.
Further, a plurality of first circular arc grooves 10 are arranged along the circumferential direction of the through-hole structure 9; the plurality of second circular arc-shaped grooves 11 are arranged along the circumferential direction of the annular boss structure.
As another embodiment of the utility model, the interval is within 0 ~ 5mm between 6 central lines of annular ring and the 7 central lines of annular slit to 7 central line diameters of annular slit are more than or equal to 6 central line diameters of annular ring.
As another embodiment of the utility model, the diameter of annular ring 6 is in 1 ~ 5mm within range, and the width of annular slit 7 is in 1 ~ 5mm within range.
As another embodiment of the present invention, the included angle between the central line of the annular hole 6 and the central line of the funnel-shaped molten metal inlet 3 is alpha1，α110 to 40 degrees; the included angle between the central line of the annular slit 7 and the central line of the funnel-shaped molten metal inlet 3 is alpha2，α210 to 40 DEG, and alpha1＜α2As shown in fig. 2.
The gas atomizing nozzle, the atomizing device for preparing metal spherical powder by gas atomization and the application thereof in the present invention will be described in detail with reference to the specific embodiments.
Example 1:
when the atomizer works, the distance between the central line of the annular hole and the central line of the annular slit between the bottom position of the inner wall of the upper end cover of the atomizer cavity and the lower end cover of the cavity is 1 mm. The number of the annular holes between the bottom position of the inner wall of the upper end cover of the cavity and the lower end cover of the cavity is 9, the diameter of the minimum position of the hole is 2mm, the width of the minimum position of the annular slit is 1.5mm, and the included angle of the central line of the annular hole is alpha125 degrees, and the included angle of the center line of the annular slit is alpha230 ° is set. The diameter of the flow guide is 4 mm. The metal to be atomized is 100Kg of 18Ni300 die steel. After the 18Ni300 die steel material is subjected to vacuum induction melting, atomization is performed. During atomization, the atomization gas is argon, and the atomization pressure is 2.5 MPa. Continuous successful fog6, melting; -200 mesh metal powder about 79%, 100 mesh metal powder about 93%, and sphericity about 0.92.
Example 2:
when the atomizer works, the distance between the central line of the annular hole and the central line of the annular slit between the bottom position of the inner wall of the upper end cover of the atomizer cavity and the lower end cover of the cavity is 0 mm. The number of the annular holes between the bottom position of the inner wall of the upper end cover of the cavity and the lower end cover of the cavity is 9, the diameter of the minimum position of the hole is 2mm, the width of the minimum position of the annular slit is 1.5mm, and the included angle of the central line of the annular hole is alpha125 degrees, and the included angle of the center line of the annular slit is alpha225 deg.. The diameter of the flow guide is 4 mm. The metal to be atomized is 100Kg of 18Ni300 die steel. After the 18Ni300 die steel material is subjected to vacuum induction melting, atomization is performed. During atomization, the atomization gas is argon, and the atomization pressure is 2.5 MPa. 6, continuously and successfully atomizing; -200 mesh metal powder about 72%, 100 mesh metal powder about 92%, and sphericity about 0.89.
Example 3:
when the atomizer works, the distance between the central line of the annular hole and the central line of the annular slit between the bottom position of the inner wall of the upper end cover of the atomizer cavity and the lower end cover of the cavity is 1 mm. The number of the annular holes between the bottom position of the inner wall of the upper end cover of the cavity and the lower end cover of the cavity is 9, the diameter of the minimum position of the hole is 2mm, the width of the minimum position of the annular slit is 1.5mm, and the included angle of the central line of the annular hole is alpha120 degrees, the central line of the annular slit forms an included angle alpha225 deg.. The diameter of the flow guide is 4 mm. The metal to be atomized is 100Kg of 18Ni300 die steel. After the 18Ni300 die steel material is subjected to vacuum induction melting, atomization is performed. During atomization, the atomization gas is argon, and the atomization pressure is 3 MPa. 6, continuously and successfully atomizing; -200 mesh metal powder about 76%, 100 mesh metal powder about 92%, and sphericity about 0.91.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. The utility model provides an atomizing nozzle, its characterized in that includes cavity upper end cover (1) and cavity lower extreme cover (2), wherein:
the upper end cover (1) of the cavity is cylindrical, and one end of the upper end cover is provided with an opening; the cavity lower end cover (2) is disc-shaped, the cavity lower end cover (2) is arranged at the opening of the cavity upper end cover (1) in a covering mode, and an air cavity (4) is formed between the cavity upper end cover (1) and the cavity lower end cover (2);
the middle part of the upper end cover (1) of the cavity is provided with a funnel-shaped molten metal inlet (3), the middle part of the excircle side wall of the upper end cover (1) of the cavity is provided with two air inlets (8) which are respectively communicated with the air cavity (4), and the two air inlets (8) are arranged in axial symmetry; and a Laval-shaped air outlet (5) which is matched with the annular hole (6) and the annular slit (7) is formed between the bottom end position of the inner wall of the cavity upper end cover (1) and the cavity lower end cover (2).
2. The gas atomizing nozzle according to claim 1, characterized in that the cavity lower end cover (2) is recessed toward one side close to the cavity upper end cover (1), and has a through hole structure (9) in the middle, the bottom end position of the inner wall of the cavity upper end cover (1) is extended along the circumferential direction to form an annular boss structure, and the gas outlet (5) is formed between the annular boss structure and the through hole structure (9).
3. The gas atomizing nozzle according to claim 2, characterized in that at least one first circular arc-shaped groove (10) which is penetrated up and down is formed on the inner side wall of the through hole structure (9) along the thickness direction of the side wall; the annular boss structure is provided with at least one second circular arc-shaped groove (11) which is communicated up and down along the boss thickness direction, and the first circular arc-shaped groove (10) and the second circular arc-shaped groove (11) are fitted with each other to form the annular hole (6).
4. A gas atomizing nozzle according to claim 3, characterized in that said first circular arc-shaped groove (10) is provided in plurality and said plurality of first circular arc-shaped grooves (10) is provided along a circumferential direction of said through-hole structure (9); the second circular arc-shaped grooves (11) are arranged in a plurality, and the second circular arc-shaped grooves (11) are arranged along the circumferential direction of the annular boss structure.
5. A gas atomizing nozzle according to claim 3 or 4, characterized in that the distance between the center line of said annular hole (6) and the center line of said annular slit (7) is 0-5 mm, and the diameter of the center line of said annular slit (7) is not less than the diameter of the center line of said annular hole (6).
6. A gas atomizing nozzle according to claim 3 or 4, characterized in that said annular hole (6) has a diameter of 1 to 5mm and said annular slit (7) has a width of 1 to 5 mm.
7. A gas atomising nozzle according to claim 3 or 4, characterised in that the centre line of the annular ring (6) is at an angle α to the centre line of the funnel-shaped molten metal inlet (3)1，α110 to 40 degrees; the included angle between the central line of the annular slit (7) and the central line of the funnel-shaped molten metal inlet (3) is alpha2，α210 to 40 DEG, and alpha1＜α2。
8. The gas atomizing nozzle according to claim 2, characterized in that the chamber lower end cap (2) has a connecting groove (12) formed along its circumference on the side facing the chamber upper end cap (1); and a connecting insert block (13) is formed on the side wall of the opening of the cavity upper end cover (1) along the circumferential direction of the side wall, and the connecting insert block (13) is inserted into the connecting groove (12) and is hermetically connected with the connecting groove through a sealing ring (14).
9. An atomising device comprising an atomiser nozzle as claimed in any one of claims 1 to 8.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021702495.XU CN213257110U (en) | 2020-08-14 | 2020-08-14 | Gas atomizing nozzle and atomizing device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021702495.XU CN213257110U (en) | 2020-08-14 | 2020-08-14 | Gas atomizing nozzle and atomizing device |
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| CN213257110U true CN213257110U (en) | 2021-05-25 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111975007A (en) * | 2020-08-14 | 2020-11-24 | 中航迈特粉冶科技（北京）有限公司 | Gas atomizing nozzle and atomizing device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111975007A (en) * | 2020-08-14 | 2020-11-24 | 中航迈特粉冶科技（北京）有限公司 | Gas atomizing nozzle and atomizing device |
| CN111975007B (en) * | 2020-08-14 | 2022-07-22 | 中航迈特粉冶科技(徐州)有限公司 | Gas atomizing nozzle and atomizing device |
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