CN109570518B - Supersonic gas atomization spray disk for metal powder preparation - Google Patents
Supersonic gas atomization spray disk for metal powder preparation Download PDFInfo
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- CN109570518B CN109570518B CN201910059453.4A CN201910059453A CN109570518B CN 109570518 B CN109570518 B CN 109570518B CN 201910059453 A CN201910059453 A CN 201910059453A CN 109570518 B CN109570518 B CN 109570518B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
- B22F2009/088—Fluid nozzles, e.g. angle, distance
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The invention relates to a supersonic gas atomization spray plate for preparing metal powder, which comprises a spray plate upper lip and a spray plate lower lip, wherein an annular cooling water cavity is arranged inside the spray plate upper lip, a central hole penetrating through the thickness of the spray plate upper lip is formed in the center of the spray plate upper lip and used for placing a flow guide nozzle, an air inlet pipeline connected with an external air source is arranged on the spray plate lower lip, an annular air cavity can be formed after the spray plate lower lip and the spray plate upper lip are assembled, and a nozzle with a half Laval structure is formed at an outlet of the annular air cavity after the spray plate upper lip and the spray plate lower lip are assembled. The invention reduces the thermal deformation of the spray disk by circulating cooling water, protects the sealing performance of the integral structure of the spray disk and prolongs the service life of the spray disk. The upper lip of the spray plate and the lower lip of the spray plate are assembled to form a circular seam type nozzle with a half Laval structure, and the width of the throat part of the nozzle is adjustable. The process has wide adjusting window, low air consumption and uniform airflow in the spray plate, and can greatly increase the yield of fine powder.
Description
Technical Field
The invention relates to the technical field of metal powder preparation through gas atomization, in particular to a supersonic gas atomization spray disk for metal powder preparation.
Background
With the rapid iterative upgrade and rapid development of science and technology, spherical metal powder with small particle size gradually becomes the core raw material of various industrial products, and high-quality metal powder is a key factor for ensuring the realization of product design idea and core technology application and also an important precondition for determining product cost and ensuring the quality and performance of industrial products.
Nowadays, the gas atomization technology has become one of the important methods for preparing high-quality metal powder on a large scale. When the metal powder is prepared by gas atomization, high-speed airflow impacts a metal liquid flow to break the metal liquid flow into fine metal liquid drops, and finally the metal liquid drops are spheroidized and solidified to form fine metal powder in the flying process. Because high-pressure inert gas is generally used for atomization, the prepared metal powder has the characteristics of fine particle size, low oxygen content, high sphericity and the like; in addition, the high-speed airflow can realize the rapid cooling of the metal powder, so that the metal powder with fine microstructure and uniform alloy components can be obtained. The metal powder prepared by gas atomization has a plurality of excellent properties, and is widely applied to the advanced preparation technical fields of metal injection molding, cold and hot spraying, metal 3D printing rapid molding and the like.
In the gas atomization process, the overall structure of the gas atomization spray plate and the fine structure at the nozzle directly influence the production process and the production efficiency of the metal powder, and are key factors for determining the performance and the production cost of the metal powder. Therefore, the improvement of the structure of the gas atomization spray disk and the optimization of the structure at the position of the nozzle have important significance for improving the atomization efficiency and realizing the production of high-quality and low-cost metal powder. Among many methods for improving atomization efficiency, increasing the speed of the gas flow at the nozzle is one of important means, and generally, a nozzle with a Laval structure is applied, and the nozzle with the Laval structure can accelerate the gas flow at the nozzle to a speed exceeding the sonic speed, so as to enhance the impact crushing capability of the gas flow on the metal liquid flow, thereby realizing the refinement of the metal powder; in addition, by combining the limiting or tightly-coupled assembling structure of the flow guide nozzle and the gas atomization spray disk, narrower particle size distribution can be further obtained.
The traditional supersonic speed gas atomizing nozzle is generally of a full Laval structure, the requirement on assembly precision is high, if the gas atomizing spray disk adopts a split structure design of an upper lip and a lower lip, the flow state of gas flow in the nozzle can be seriously influenced by assembly deviation at the nozzle, and the gas flow speed is far lower than the expected speed of the structural design of the nozzle; if the Laval structure is strictly restricted, the adjustment range of the gas atomization process can be limited, and the process adaptability of metal powder preparation is reduced. In addition, when the air atomization spray plate is assembled by adopting a limiting type or a tight coupling type structure, the tundish system and the flow guide device can transfer heat to the air atomization spray plate, the continuous thermal shock can cause the spray plate to generate obvious thermal deformation, the service life of the air atomization spray plate is shortened, the production cost is greatly increased, and the production efficiency is seriously reduced.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the gas atomization spray disk which uses circulating cooling water to effectively protect the spray disk and adopts a split structure design and a circular seam type half Laval structure nozzle, namely the supersonic gas atomization spray disk for preparing metal powder.
The purpose of the invention can be realized by the following technical scheme:
a supersonic gas atomization spray disc for metal powder preparation comprises a spray disc upper lip and a spray disc lower lip, wherein an annular cooling water cavity and a cooling water pipeline are arranged inside the spray disc upper lip, the annular cooling water cavity is communicated with the cooling water pipeline, the cooling water pipeline is used for introducing an external water source, the external water source can enter the cooling water cavity through the cooling water pipeline on one side of the spray disc upper lip and flow out from the cooling water pipeline on the other side, a central hole penetrating through the thickness of the spray disc upper lip is formed in the center of the spray disc upper lip, a flow guide nozzle is arranged in the central hole, and a limiting type or tight coupling type assembly structure is formed by the spray disc and the gas atomization spray disc; the nozzle of the semi-Laval structure is an annular seam channel formed by hyperboloids, wherein the hyperboloids are obtained by rotating the slot channel for 360 degrees around the axis of a central hole, and the slot channel is an asymmetric slot channel taking the axis of the central hole as a central line.
In an embodiment of the present invention, it is preferable that the slit-shaped channel is composed of a section straight line AB of an upper lip of the nozzle plate, a section straight line CD of a lower lip of the nozzle plate, an arc section DE and an arc section EF, where the straight line CD and the arc section DE are tangent at a connection point D, the arc section DE and the arc section EF are circumscribed at a connection point E, a tangent line of the arc section EF at the point F is parallel to the straight line AB, a point on the arc section DE, which is the shortest from the straight line AB, is H, that is, the point H and the straight line AB form a throat of the slit-shaped channel, the arc section DH and the straight line AB form a gradual contraction of the slit-shaped channel, and the arc sections HE and EF and the straight line AB form a gradual expansion of the slit-shaped channel;
the hyperboloid structure is composed of a contraction section formed by a circular arc section DH and a straight line AB, an expansion section formed by a circular arc section HE, an EF and the straight line AB, and a throat part of a half Laval structure.
In one embodiment of the present invention, in a cross section of the upper lip of the nozzle plate through the central hole axis, an extension of the straight line AB forms an angle α of 0 ° to 60 ° with the central hole axis, and α ≠ 0 °, preferably α is 10 ° to 45 °.
In one embodiment of the present invention, in a cross section of the lower lip of the spray plate passing through the axis of the central hole, an included angle β between a straight line CD and a vertical direction passing through a point C is 45 ° to 150 °, and preferably 45 ° to 80 °.
In one embodiment of the invention, it is preferred that the radius R of the circular arc DE in a section of the lower lip of the nozzle plate through the axis of the central bore is the radius R of the circular arc DE1Radius R from the circular arc section EF2Radius ratio R of1/R2Is that 2: 1-1: 3, preferably 1: 1-1: 2.
in one embodiment of the present invention, it is preferable that the aperture d of the central hole is1Is the ratio d of the diameter of the flow guide nozzle hole1/d2Is 10: 1-5: 1, preferably 8: 1-5: 1.
in one embodiment of the invention, the length l of the straight line CD in a section of the lower lip of the nozzle plate through the central bore axis is preferably greater1Ratio l to the sum of the radii of the circular segment DE and the circular segment EF1/(R1+R2) Is 5: 1-1: 3, preferably 5: 1-4: 3.
in one embodiment of the present invention, preferably, the ratio h/s of the nozzle throat width h of the half-Laval structure to the length s of the straight line AB is 1: 15-1: 20, preferably 1: 16-1: 20.
in one embodiment of the invention, the spray plate is preferably provided withIn the section of the lip passing through the axis of the central hole, the ratio s/(R) of the length s of the straight line AB to the sum of the radii of the circular arc section DE and the circular arc section EF1+R2) Is that 2: 1-1: 3, preferably 2: 1-2: 3.
in one embodiment of the invention, the cross section of the annular cooling water cavity in the cross section of the upper lip of the spray disk passing through the axis of the central hole has a length l3And a height h2Ratio of (l)3/h2Is 4: 1-7: 1, preferably 4: 3-7: 3, the distance h between the upper surface of the annular cooling water cavity and the upper surface of the upper lip of the spray disk1The distance l between the inner wall of the annular cooling water cavity and the wall of the central hole2Ratio h of1/l2Is that the ratio of (3): 5-1: 7, preferably 3: 5-2: 7, the distance l between the inner wall of the annular cooling water cavity and the hole wall of the central hole2The cross-sectional length l of the annular cooling water cavity3Ratio of (l)2/l3Is that 2: 1-1: 1, preferably 3: 2-1: 1.
in one embodiment of the present invention, a seal groove for mounting a seal is preferably provided on a contact surface between the lower lip of the nozzle plate and the upper lip of the nozzle plate.
In one embodiment of the invention, the cooling water pipeline and the annular cooling water cavity can be connected in a straight direction or a tangential direction.
In one embodiment of the invention, the air inlet pipeline and the annular air cavity can be connected in a straight direction or a tangential direction.
Compared with the prior art, the invention has the advantages that:
(1) the invention adopts the split design of the upper lip and the lower lip of the spray plate, has simple structure and is easy to process. The throat width of the circular seam type half Laval structure nozzle is adjustable, the gas atomization process aiming at metal melts with different physical properties is wide in adjustment range, the Mach number at the nozzle can be adjusted, supersonic speed can be realized under small air pressure, the gas consumption cost during aerosol production is reduced, high fine powder yield can be obtained, and the particle size distribution range is narrow;
(2) according to the invention, the cooling water cavity is added in the spray plate structure, so that thermal shock on the spray plate can be reduced through circulating cooling water, thermal deformation of the whole structure of the spray plate is reduced, the whole sealing structure of the gas atomization spray plate is protected, and the service life of the gas atomization spray plate is prolonged;
(3) the assembly structure of the upper lip and the lower lip of the spray plate is designed according to the aerodynamic theory, and the smooth curve design is adopted, so that the energy loss of air flow in the annular air cavity and the half Laval nozzle is reduced.
(4) When the device is used, the process adjusting window is wide, the air consumption is low, the air flow in the spray disk is uniform, and the fine powder yield can be greatly increased.
Drawings
FIG. 1 is a schematic structural view of a supersonic gas atomizing spray disk for metal powder preparation according to the present invention;
FIG. 2 is a schematic view of the supersonic gas atomizing spray disk for metal powder production of the present invention after being equipped with a flow guide nozzle;
FIG. 3 is a schematic diagram of a partially enlarged structure within a dashed box I in FIG. 1;
fig. 4 is a partially enlarged structural diagram within a dashed line box II in fig. 1.
Wherein, 1 is the upper lip of the spray plate, 2 is the lower lip of the spray plate, 3 is an annular cooling water cavity, 4 is a central hole, 5 is a cooling water pipeline, 6 is an annular air cavity, 7 is an air inlet pipeline, 8 is a sealing ring groove, and 9 is a flow guide nozzle.
Detailed Description
Referring to fig. 1-4, a supersonic gas atomization spray plate for metal powder preparation comprises a spray plate upper lip 1 and a spray plate lower lip 2, wherein an annular cooling water cavity 3 and a cooling water pipeline 5 are arranged inside the spray plate upper lip 1, the annular cooling water cavity 3 is communicated with the cooling water pipeline 5, the cooling water pipeline 5 is used for introducing an external water source, the external water source can enter the cooling water cavity through the cooling water pipeline 5 on one side of the spray plate upper lip 1 and flow out from the cooling water pipeline 5 on the other side, a central hole 4 penetrating through the thickness of the spray plate upper lip 1 is formed in the center of the spray plate upper lip 1, a flow guide nozzle 9 is arranged in the central hole 4, and the flow guide nozzle and the gas atomization spray plate form a limiting or tightly coupled assembly structure; the lower spray disk lip 2 is provided with an air inlet pipeline 7 used for being connected with an external air source, the lower spray disk lip 2 and the upper spray disk lip 1 can form an annular air cavity 6 after being assembled, the annular air cavity 6 is communicated with the air inlet pipeline 7, the upper spray disk lip 1 and the lower spray disk lip 2 form a nozzle of a half-Laval structure at an outlet of the annular air cavity 6 after being assembled, the section of the nozzle of the half-Laval structure passing through the axis of the central hole 4 in the upper spray disk lip 1 is an asymmetric slit-shaped channel taking the axis of the central hole 4 as a central line, one side of the slit-shaped channel is a straight line, the other side of the slit-shaped channel is a curved line, and the nozzle of the half-Laval structure is a circular seam channel formed by hyperboloids obtained by rotating the slit-shaped channel for 360 degrees around the axis of the central hole.
The slit-shaped channel consists of a section straight line AB of an upper lip of the spray disk, a section straight line CD of a lower lip of the spray disk, an arc section DE and an arc section EF, wherein the straight line CD is tangent to the arc section DE at a connecting point D, the arc section DE is circumscribed to the arc section EF at a connecting point E, the tangent of the arc section EF at a point F is parallel to the straight line AB, a point on the arc section DE, which has the shortest distance with the straight line AB, is H, namely the point H and the straight line AB form a throat part of the slit-shaped channel, the arc section DH and the straight line AB form gradual contraction of the slit-shaped channel, and the arc sections DH and EF and the straight line AB form gradual expansion of the slit-shaped channel; the hyperboloid structure is composed of a contraction section formed by a circular arc section DH and a straight line AB, an expansion section formed by a circular arc section HE, an EF and the straight line AB, and a throat part of a half Laval structure.
In the section of the spray disk upper lip 1 passing through the axis of the central hole 4, the extension line of the straight line AB and the axis of the central hole 4 form an included angle alpha of 0-60 degrees, alpha is not equal to 0 degrees, and alpha is preferably 10-45 degrees.
In the section of the lower lip 2 of the spray plate passing through the axis of the central hole 4, the included angle beta between the straight line CD and the vertical direction of the point C is 45-150 degrees, and preferably 45-80 degrees.
Radius R of circular arc section DE in the section of the lower lip 2 of the spray plate passing through the axis of the central hole 41Radius R from the circular arc section EF2Radius ratio R of1/R2Is that 2: 1-1: 3, preferably 1: 1-1: 2.
diameter d of the central hole 41Is the ratio d of the diameter of the hole of the flow guiding nozzle 91/d2Is 10: 1-5: 1, preferably 8: 1-5: 1.
the length l of the straight line CD in the section of the lower lip 2 of the spray disk passing through the axis of the central hole 41Ratio l to the sum of the radii of the circular segment DE and the circular segment EF1/(R1+R2) Is 5: 1-1: 3, preferably 5: 1-4: 3.
the ratio h/s of the width h of the throat of the nozzle of the half-Laval structure to the length s of the straight line AB is 1: 15-1: 20, preferably 1: 16-1: 20.
in the section of the upper lip 1 of the spray disk passing through the axis of the central hole 4, the ratio s/(R) of the length s of the straight line AB to the sum of the radiuses of the circular arc section DE and the circular arc section EF1+R2) Is that 2: 1-1: 3, preferably 2: 1-2: 3.
the section length l of the annular cooling water cavity 3 in the section of the spray disk upper lip 1 passing through the axis of the central hole 43And height h2Ratio of (l)3/h2Is 4: 1-7: 1, preferably 4: 3-7: 3, the distance h between the upper surface of the annular cooling water cavity 3 and the upper surface of the spray disk upper lip 11The distance l between the inner wall of the annular cooling water cavity 3 and the hole wall of the central hole 42Ratio h of1/l2Is 3: 5-1: 7, preferably 3: 5-2: 7, the distance l between the inner wall of the annular cooling water cavity 3 and the hole wall of the central hole 42The cross-sectional length l of the annular cooling water cavity 33Ratio of (l)2/l3Is that 2: 1-1: 1, preferably 3: 2-1: 1.
and a sealing ring groove 8 for installing a sealing ring is arranged on the binding surface of the lower lip 2 of the spray plate and the upper lip 1 of the spray plate.
The cooling water pipeline 5 and the annular cooling water cavity 3 can be connected in a straight direction or a tangential direction.
The air inlet pipeline 7 and the annular air cavity 6 can be connected in a straight direction or a tangential direction.
The invention is described in detail below with reference to the figures and specific embodiments.
Example 1
In this embodiment, 316L stainless steel powder is prepared after the flow guide nozzle is assembled on the atomizing spray disk. Annular cooling water cavity l of spray disk upper lip3/h2Is 4: 3, h1/l2Is 3: 7, l2/l3Is 3: 2. the cooling water pipeline adopts an annular cooling water cavity which enters in a tangential water inlet connection mode, the water temperature of circulating cooling water is controlled to be 40-50 ℃, and the pressure of the circulating cooling water is 0.5 MPa. The air inlet pipe adopts the connection of tangential air inletEntering the annular air cavity. The temperature of the 316L stainless steel molten metal entering the flow guiding nozzle is 1650 ℃. The alpha angle of the gas atomization spray disk is 30 degrees, the beta angle is 70 degrees, and R is1/R2Is 1: 2, d1/d2Is a ratio of 2: 1, l1/(R1+R2) Is 3: 1, h/s is 1: 17, s/(R)1+R2) Is that 2: 3, the atomizing gas is nitrogen, the atomizing pressure is 2.0MPa, the air flow speed at the outlet of the circular seam type half Laval nozzle can reach Mach 2, and the prepared 316L stainless steel powder D50 is 34 mu m.
The embodiments described above are intended to facilitate a person of ordinary skill in the art in understanding and using the invention. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (12)
1. The supersonic gas atomization spray disc for metal powder preparation is characterized by comprising a spray disc upper lip (1) and a spray disc lower lip (2), wherein an annular cooling water cavity (3) and a cooling water pipeline (5) are arranged inside the spray disc upper lip (1), the annular cooling water cavity (3) is communicated with the cooling water pipeline (5), the cooling water pipeline (5) is used for introducing an external water source, a center hole (4) penetrating through the thickness of the spray disc upper lip (1) is formed in the center of the spray disc upper lip (1), a flow guide nozzle (9) is arranged in the center hole (4), the spray disc lower lip (2) is provided with an air inlet pipeline (7) connected with an external air source, an annular air cavity (6) can be formed after the spray disc lower lip (2) and the spray disc upper lip (1) are assembled, the annular air cavity (6) is communicated with the air inlet pipeline (7), and a semi-air cavity (6) is formed at the outlet of the annular air cavity (6) after the spray disc upper lip (1) and the spray disc lower lip (2) are assembled The nozzle of the half Laval structure is an asymmetric slit-shaped channel taking the axis of a central hole (4) as a central line through the section of the axis of the central hole (4) on the upper lip (1) of a spray disk, one side of the slit-shaped channel is a straight line, the other side of the slit-shaped channel comprises a curved line section and a straight line section, and the nozzle of the half Laval structure is a circular slit channel formed by double curved surfaces obtained by rotating the slit-shaped channel for 360 degrees around the axis of the central hole;
the slit-shaped channel consists of a section straight line AB of an upper lip of the spray disk, a section straight line CD of a lower lip of the spray disk, an arc section DE and an arc section EF, wherein the straight line CD is tangent to the arc section DE at a connecting point D, the arc section DE is circumscribed to the arc section EF at a connecting point E, the tangent of the arc section EF at a point F is parallel to the straight line AB, a point on the arc section DE, which has the shortest distance with the straight line AB, is H, the point H and the straight line AB form a throat part of the slit-shaped channel, the arc section DH and the straight line AB form gradual contraction of the slit-shaped channel, and the arc sections DH and EF and the straight line AB form gradual expansion of the slit-shaped channel; the hyperboloid structure consists of a contraction section formed by an arc section DH and a straight line AB, an expansion section formed by an arc section HE, an EF and a straight line AB and a throat part of a half Laval structure; the radius R of the circular arc section DE in the section of the lower lip (2) of the spray plate passing through the axis of the central hole (4)1Radius R from the circular arc section EF2Radius ratio R of1/R2Is that 2: 1-1: 3, length of straight line CD1Ratio l to the sum of the radii of the circular segment DE and the circular segment EF1/( R1+R2) Is 5: 1-1: 3, in the section of the upper lip (1) of the spray disk passing through the axis of the central hole (4), the ratio s/(R) of the length s of the straight line AB to the sum of the radiuses of the circular arc section DE and the circular arc section EF1+R2) Is that 2: 1-1: 3;
the section length l of the annular cooling water cavity (3) in the section of the spray disk upper lip (1) passing through the axis of the central hole (4)3And a height h2Ratio of (l)3/h2Is 4: 3, the distance h between the upper surface of the annular cooling water cavity (3) and the upper surface of the spray disk upper lip (1)1The distance l between the inner wall of the annular cooling water cavity (3) and the hole wall of the central hole (4)2Ratio h of1/l2Is 3: 5-1: 7, the distance l between the inner wall of the annular cooling water cavity (3) and the hole wall of the central hole (4)2The cross-sectional length l of the annular cooling water cavity (3)3Ratio of (l)2/ l3Is that 2: 1-1: 1.
2. a supersonic gas atomizing nozzle disk for the production of metal powder according to claim 1, characterized in that, in a cross section of said upper lip (1) through the axis of the central bore (4), the extension of the straight line AB forms an angle α of 0 ° to 60 ° with the axis of the central bore (4), and α ≠ 0 °.
3. A supersonic gas atomizing spray disk for the production of metal powder according to claim 2, characterized in that the extension of the straight line AB forms an angle α of 10 ° to 45 ° with the axis of the central bore (4).
4. A supersonic gas atomizing spray disk for metal powder production according to claim 1, wherein, in a cross-section of said disk lower lip (2) through the axis of said central bore (4), the angle β between the straight line CD and the vertical direction passing through point C is 45 ° to 150 °.
5. A supersonic gas atomizing spray disk for the production of metal powder as set forth in claim 4, wherein the angle β between the straight line CD and the vertical direction passing through point C is from 45 ° to 80 °.
6. Supersonic gas atomizing spray disk for metal powder production as set forth in claim 1, characterized in that radius R of circular arc segment DE1Radius R of arc segment EF2Radius ratio R of1/R2Is 1: 1-1: 2, length of straight line CD1Ratio l to the sum of the radii of the circular segment DE and the circular segment EF1/( R1+R2) Is 5: 1-4: 3, the ratio s/(R) of the length s of the straight line AB to the sum of the radii of the circular arc section DE and the circular arc section EF1+R2) Is that 2: 1-2: 3.
7. a supersonic gas atomizing spray disk for metal powder production according to claim 1, characterized in that the aperture d of said central hole (4) is such that1Is the ratio d of the diameter of the hole of the flow guide nozzle (9)1/d2Is that 2: 1.
8. a supersonic gas atomizing spray disk for metal powder production as set forth in claim 1, wherein the ratio h/s of the nozzle throat width h of said half-Laval structure to the length s of line AB is 1: 15-1: 20.
9. a supersonic gas atomizing spray disk for metal powder production as set forth in claim 8, wherein said half-Laval configuration has a ratio h/s of nozzle throat width h to length s of straight line AB of 1: 16-1: 20.
10. a supersonic gas atomizing spray disk for metal powder production according to claim 1, wherein the distance h between the upper surface of the annular cooling water chamber (3) and the upper surface of the upper lip (1) of the spray disk is1The distance l between the inner wall of the annular cooling water cavity (3) and the hole wall of the central hole (4)2Ratio h of1/l2Is 3: 5-2: 7, the distance l between the inner wall of the annular cooling water cavity (3) and the hole wall of the central hole (4)2The cross-sectional length l of the annular cooling water cavity (3)3Ratio of (l)2/ l3Is 3: 2-1: 1.
11. a supersonic gas atomizing spray disk for metal powder production according to claim 1, characterized in that said cooling water conduit (5) is connected with annular cooling water chamber (3) in a straight or tangential direction.
12. A supersonic gas atomizing spray disk for metal powder production according to claim 1, wherein said gas inlet duct (7) is connected with the annular gas chamber (6) in a straight or tangential direction.
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| CN110052620B (en) * | 2019-05-30 | 2022-06-14 | 上海材料研究所 | Free type supersonic speed spray disk for metal powder gas atomization preparation |
| CN110434349A (en) * | 2019-08-31 | 2019-11-12 | 嘉兴田然贸易有限公司 | It is a kind of based on penetrate inhale principle atomization of liquid metal nozzle cooling device |
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