CN220050045U - Atomizing spray disc with two air current structures of different directions - Google Patents
Atomizing spray disc with two air current structures of different directions Download PDFInfo
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- CN220050045U CN220050045U CN202321410380.7U CN202321410380U CN220050045U CN 220050045 U CN220050045 U CN 220050045U CN 202321410380 U CN202321410380 U CN 202321410380U CN 220050045 U CN220050045 U CN 220050045U
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- spray disc
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- disc body
- nozzle
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- 239000007921 spray Substances 0.000 title claims abstract description 72
- 238000000889 atomisation Methods 0.000 claims abstract description 9
- 230000002457 bidirectional effect Effects 0.000 claims description 2
- 230000009977 dual effect Effects 0.000 claims 2
- 239000000843 powder Substances 0.000 abstract description 22
- 238000004519 manufacturing process Methods 0.000 abstract description 11
- 230000002401 inhibitory effect Effects 0.000 abstract description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 13
- 239000007789 gas Substances 0.000 description 13
- 239000002184 metal Substances 0.000 description 9
- 229910052751 metal Inorganic materials 0.000 description 9
- 238000000034 method Methods 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 6
- 229910052757 nitrogen Inorganic materials 0.000 description 6
- 238000013461 design Methods 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 238000009689 gas atomisation Methods 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 239000000654 additive Substances 0.000 description 3
- 230000000996 additive effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000010924 continuous production Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Landscapes
- Nozzles (AREA)
Abstract
The utility model discloses an atomization spray disc with a different-direction double-air-flow structure, which comprises a spray disc body and a disc core in threaded connection with the spray disc body; an annular air cavity is designed between the spray disc body and the disc core, and the spray disc body is provided with air inlet channels which are communicated with the annular air cavity and are symmetrically arranged; the center of the disk core is provided with a step-shaped bulge which extends downwards, the center of the top of the spray disk body is provided with a step-shaped conical opening, and the conical surface of the step-shaped conical opening and the outer conical surface of the step-shaped bulge form a first nozzle connected with the annular air cavity; the center of the bottom of the spray disc body is provided with a horn-shaped opening consistent with the center line of the stepped conical opening, and the outer surface of the horn-shaped opening is provided with a circle of second nozzles connected with the annular air cavity. The atomizing spray disk has the characteristics of inhibiting turbulent flow generation and guaranteeing continuous and stable production while providing high yield of fine powder.
Description
Technical Field
The utility model relates to the technical field of additive manufacturing, in particular to an atomization spray disc with a different-direction double-air-flow structure.
Background
The gas atomization powder preparation is to utilize high-speed high-pressure gas flow formed after shielding gas (nitrogen, argon and the like) passes through an atomization spray disc to impact molten metal flow, rapidly crush the molten metal flow and cool the molten metal flow, so as to obtain fine spherical metal powder. The powder can be obtained by gas atomization, and the characteristics of high sphericity, low oxygen content and fine granularity of the powder can be widely applied in the additive manufacturing directions of metallurgical machinery, biomedical treatment, aerospace and the like.
Along with the development of large-scale mass production of gas atomization powder preparation, two main nozzle structures exist on the market: free-form nozzles and restricted nozzles. Chinese patent publication No. CN108941589a discloses a method for preparing GH4169 powder with full particle size for additive manufacturing, using a free-falling nozzle structure. The free nozzle has the common problem that the gas energy conversion rate is low, the fine powder with high actual yield is difficult to obtain, and the proportion of 20-53 mu m is generally less than 35%; chinese patent publication No. CN102581291B discloses a circular slit type supersonic nozzle for metal gas atomization; the spray nozzle adopts a limiting type nozzle structure, the airflow focus is close to the nozzle, and turbulence generated at the airflow focus is easy to cause the metal liquid flow to adhere to the atomizing spray disk nozzle, so that atomization blockage and even molten metal back spraying are caused. Chinese patent publication No. CN112296344a discloses a double-layer aerosolizing nozzle for improving sphericity of powder. The atomizing spray disc has a complex structure with an upper layer and a lower layer, is troublesome to damage and replace once, has high processing cost and long period, is in a testing stage, and is not suitable for batch powder production in factories.
Disclosure of Invention
In order to solve the defects in the prior art, the utility model provides the atomizing spray disc with the anisotropic double-air-flow structure, which has the characteristics of simple assembly, high energy conversion rate, turbulence reduction, convenience for large-scale continuous stable atomizing production, and capability of inhibiting the generation of turbulence and guaranteeing continuous stable production while providing high yield of fine powder.
In order to achieve the above purpose, the utility model adopts the following specific scheme:
an atomization spray disc with a different-direction double-air-flow structure comprises a spray disc body and a disc core in threaded connection with the spray disc body; an annular air cavity is designed between the spray disc body and the disc core, and the spray disc body is provided with air inlet channels which are communicated with the annular air cavity and are symmetrically arranged;
the center of the disc core is provided with a step-shaped bulge which extends downwards, the center of the top of the spray disc body is provided with a step-shaped conical opening, the conical surface of the step-shaped conical opening and the outer conical surface of the step-shaped bulge form a first nozzle connected with the annular air cavity, and the included angle between the first nozzle and the axis of the step-shaped conical opening is 30-45 degrees;
the center of the bottom of the spray disc body is provided with a horn-shaped opening consistent with the center line of the stepped conical opening, the outer surface of the horn-shaped opening is provided with a circle of second nozzles connected with the annular air cavity, and the included angle between the second nozzles and the center line of the stepped conical opening is 30-40 degrees.
Preferably, the first nozzle is a laval structure.
As a preferable scheme, the section of the first nozzle passing through the stepped conical opening axis of the spray disc body is a slot-shaped channel which takes the stepped conical opening axis as a central line to be symmetrical, one side of the slot-shaped channel is a straight line, the other side of the slot-shaped channel is a curve, the slot-shaped channel consists of a circular arc section AB, a straight line section BC, a circular arc section CD and a disc core section straight line section EF of the spray disc body, and the throat part of the slot-shaped channel is the shortest distance between the straight line section BC and the straight line section EF.
Preferably, the shortest distance between the straight line segment BC and the straight line segment EF is 0.5-0.8mm.
Preferably, the length of the straight line segment BC is 1-3mm.
Preferably, the diameter of the second nozzle is 0.5-0.8mm.
Preferably, 30-40 second nozzles are provided.
The beneficial effects are that:
1) The atomizing spray disc comprises a disc core and a spray disc body, the disc core and the spray disc body are connected through threads to form an anisotropic double-layer air flow structure, the upper-layer air flow is sprayed out by a first nozzle formed by matching the disc core and the spray disc body, and the first nozzle adopts a Laval structure, so that the energy conversion rate of gas is improved; the lower air flow is sprayed out from a second nozzle designed on the inclined plane at the bottom of the spray disc body, and the design of the lower air flow adopts a free annular hole nozzle structure, so that the phenomenon of molten metal adhesion caused by turbulent flow near the first nozzle is effectively controlled; the design of the upper and lower double-layer airflow structure not only provides higher energy conversion rate and can obtain high-yield fine powder, but also has the capability of inhibiting turbulence, and is beneficial to continuous stable large-scale mass production.
2) The slit-shaped channel of the first nozzle adopts a Laval structure, a straight line segment BC is added to conduct steady flow, the injection angle is 30-45 degrees, the atomization efficiency is effectively improved, and the proportion of 20-53 mu m fine powder is more than 50%.
3) The atomizing spray disc adopts a spray disc body and a disc core threaded connection structure, so that the spray disc body can be replaced conveniently, and the atomizing spray disc is an effective mode for saving cost in batch production.
Drawings
Fig. 1 is a schematic diagram of an atomizing spray disk (the core is not connected to the disk body).
FIG. 2 is a second schematic diagram of the structure of the atomizing spray disk (the core is connected with the spray disk body).
Fig. 3 is a bottom view of fig. 2.
Fig. 4 is a cross-sectional view at A-A in fig. 2.
Fig. 5 is an enlarged view at I in fig. 4.
The marks in the figure: 1. the disc comprises a disc core, 2, a spray disc body, 3, a positioning threaded hole, 4, a second nozzle, 5, an air inlet channel, 6, a first nozzle, 7 and an annular air cavity.
Detailed Description
In the description of the present utility model, it should be understood that the azimuth or positional relationship indicated by the terms "upper", "lower", etc. are based on the azimuth or positional relationship shown in fig. 2, and are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or element in question must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present utility model.
It should be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Referring to fig. 1 to 5, an atomization spray disc with a bidirectional double-air-flow structure in the present utility model includes a spray disc body 2 and a disc core 1 in threaded connection with the spray disc body 2. The locating threaded holes 3 on the spray disc body 2 are matched with the fastening pieces to fix the atomizing spray disc on the atomizing tower.
An annular air cavity 7 is designed between the spray disc body 2 and the disc core 1, and the spray disc body 2 is provided with air inlet channels 5 which are communicated with the annular air cavity 7 and are symmetrically arranged; the center of the disc core 1 is provided with a step-shaped bulge which extends downwards, the center of the top of the spray disc body 2 is provided with a step-shaped conical opening, the conical surface of the step-shaped conical opening and the outer conical surface of the step-shaped bulge form a first nozzle 6 connected with an annular air cavity 7, and the first nozzle 6 is of a Laval structure so as to improve the energy conversion rate of gas, and the included angle between the first nozzle 6 and the axis of the step-shaped conical opening is 30-45 degrees; the center of the bottom of the spray disc body 2 is provided with a horn-shaped opening consistent with the center line of the stepped conical opening, the outer surface of the horn-shaped opening is provided with a circle of second nozzles 4 in inclined design, each second nozzle 4 is connected with the annular air cavity 7, and the included angle between the second nozzle 4 and the center line of the stepped conical opening is 30-40 degrees. The gas enters the spray disc body 2 through the air inlet channel 5 and then is divided into two layers of gas flows to flow out, the upper layer of gas flows out through the first nozzle 6, and the lower layer of gas flows out through the second nozzle 4, so that downward gas flow guiding is provided, and turbulent flow generated by collision between the first nozzle 6 and the metal liquid flow can be prevented from splashing upwards, so that the first nozzle 4 is bonded with molten steel.
The design of the upper and lower double-layer airflow structure not only provides higher energy conversion rate and can obtain high-yield fine powder, but also has the capability of inhibiting turbulence, and is beneficial to continuous stable large-scale mass production.
Referring to fig. 4 and 5, the cross section of the first nozzle 6 passing through the stepped cone opening axis of the nozzle body 2 is a slot-shaped channel symmetrical with the stepped cone opening axis as a central line, one side of the slot-shaped channel is a straight line, the other side of the slot-shaped channel is a curve, the slot-shaped channel is composed of a circular arc section AB, a straight line section BC, a circular arc section CD and a straight line section EF of the section of the nozzle body 2, the throat of the slot-shaped channel is the shortest distance between the straight line section BC and the straight line section EF, the shortest distance between the straight line section BC and the straight line section EF is 0.5-0.8mm, and the length of the straight line section BC is 1-3mm. The Laval effect of the slit-shaped channel effectively increases the air flow velocity to make the powder finer, and the presence of the straight line segment BC provides a steady flow effect.
In detail, referring to fig. 3, the diameter of the second nozzles 4 is 0.5-0.8mm, and 30-40 second nozzles 4 are provided.
The disc core 1 and the spray disc body 2 in the utility model form a single air inlet channel double-layer air flow structure through threaded connection, are easy to assemble and replace, are different from the double-channel double-layer disc structure atomization spray disc, have complex design and high processing cost and long period, and are not suitable for batch powder production in factories.
Example 1
The Ni80Cr20 nickel-base alloy melt enters the atomizing spray disc from the guide pipe at the temperature of 1660 ℃ and collides with the air flow passing through the atomizing spray disc to form powder. The atomizing gas adopts nitrogen with the pressure of 4.0MPa. The distance between the narrowest part of the throat of the first nozzle 6 and the first nozzle 6 at the upper layer of the nitrogen gas entering the atomizing spray disc is 0.8mm, and the included angle between the first nozzle 6 and the vertical direction is 40 degrees, so that a first layer of air flow is formed; the lower layer forms a second laminar air flow through a second nozzle 4 having an angle of 40 deg. and an annular diameter of 0.8mm. Under the combined action of double-layer air flow, the average grain diameter of the finally obtained powder is 26.5 mu m. Less than 10 mu m in proportion and more than 63 mu m in proportion less than 10%; the real yield of 20-53 μm is 58%; the problem of molten steel blockage caused by turbulence in the continuous production process is zero.
Example 2
The 316L iron-based melt exits the atomizing disk from the manifold at a temperature of 1620 ℃ and collides with the air flow through the atomizing disk to form a powder. The atomizing gas adopts nitrogen with the pressure of 4.0MPa. The upper layer of nitrogen entering the atomizing spray disc passes through the first nozzle 6, the distance of the narrowest part of the throat part of the first nozzle 6 is 0.8mm, the included angle between the first nozzle 6 and the vertical direction is 35 degrees, a first layer of air flow is formed, the lower layer passes through the second nozzle 4 with the angle of 35 degrees, and the diameter of the annular hole is 0.8mm, and a second layer of air flow is formed. Under the combined action of double-layer air flow, the average grain diameter of the finally-obtained powder is 42.0 mu m. The proportion below 20 μm is less than 10%, and the proportion above 90 μm is less than 10%; the actual yield of 38-75 μm is 62%; the problem of molten steel blockage caused by turbulence in the continuous production process is zero.
Example 3
The material Ni60AA nickel-based melt enters the atomizing spray disk from the flow guide pipe at the temperature of 1400 ℃, and collides with the airflow passing through the atomizing spray disk to form powder. The atomizing gas adopts nitrogen with the pressure of 4.0MPa. The nitrogen upper layer entering the atomizing spray disc passes through the first nozzle 6, the distance of the narrowest part of the throat part of the first nozzle 6 is 0.8mm, the included angle between the first nozzle 6 and the vertical direction is 30 degrees, a first layer of air flow is formed, the lower layer passes through the second nozzle 4 with the angle of 30 degrees, and the diameter of the annular hole is 0.8mm, and a second layer of air flow is formed. Under the combined action of double-layer air flow, the average grain diameter of the finally obtained powder is 75.0 mu m. Less than 45 mu m in proportion < 10%, more than 150 mu m in proportion < 10%; the real yield of 53-150 μm is 65%; the problem of molten steel blockage caused by turbulence in the continuous production process is zero.
The above description is only of the preferred embodiment of the present utility model, and is not intended to limit the present utility model in any way. All equivalent changes or modifications made according to the essence of the present utility model should be included in the scope of the present utility model.
Claims (7)
1. An atomization spray disc with a different-direction double-air-flow structure is characterized by comprising a spray disc body and a disc core in threaded connection with the spray disc body; an annular air cavity is designed between the spray disc body and the disc core, and the spray disc body is provided with air inlet channels which are communicated with the annular air cavity and are symmetrically arranged;
the center of the disc core is provided with a step-shaped bulge which extends downwards, the center of the top of the spray disc body is provided with a step-shaped conical opening, the conical surface of the step-shaped conical opening and the outer conical surface of the step-shaped bulge form a first nozzle connected with the annular air cavity, and the included angle between the first nozzle and the axis of the step-shaped conical opening is 30-45 degrees;
the center of the bottom of the spray disc body is provided with a horn-shaped opening consistent with the center line of the stepped conical opening, the outer surface of the horn-shaped opening is provided with a circle of second nozzles connected with the annular air cavity, and the included angle between the second nozzles and the center line of the stepped conical opening is 30-40 degrees.
2. An atomizing spray disc having a counter-directed dual air flow configuration as set forth in claim 1, wherein said first nozzle is of a laval configuration.
3. An atomizing spray disc with a bidirectional double-airflow structure according to claim 2, wherein the first nozzle is a slot-shaped channel which is symmetrical by taking the axis of the stepped conical opening as a central line through the section of the axis of the stepped conical opening of the spray disc body, one side of the slot-shaped channel is a straight line, the other side of the slot-shaped channel is a curve, the slot-shaped channel consists of a circular arc section AB, a straight line section BC, a circular arc section CD and a straight line section EF of the cross section of the spray disc body, and the throat part of the slot-shaped channel is the shortest distance between the straight line section BC and the straight line section EF.
4. A spray disk with a dual counter-current structure according to claim 3, characterized in that the shortest distance between the straight line segment BC and the straight line segment EF is 0.5-0.8mm.
5. A spray disk with a two-air-flow structure according to claim 3, characterized in that the length of the straight line segment BC is 1-3mm.
6. An atomizing spray disc having a double-air-flow structure in opposite directions as claimed in claim 1, wherein the diameter of the second nozzle is 0.5-0.8mm.
7. An atomizing spray disc with a counter-rotating double air flow structure as set forth in claim 1, wherein the second nozzles are provided in a number of 30-40.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321410380.7U CN220050045U (en) | 2023-06-05 | 2023-06-05 | Atomizing spray disc with two air current structures of different directions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321410380.7U CN220050045U (en) | 2023-06-05 | 2023-06-05 | Atomizing spray disc with two air current structures of different directions |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220050045U true CN220050045U (en) | 2023-11-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321410380.7U Active CN220050045U (en) | 2023-06-05 | 2023-06-05 | Atomizing spray disc with two air current structures of different directions |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220050045U (en) |
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2023
- 2023-06-05 CN CN202321410380.7U patent/CN220050045U/en active Active
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