CN105618772B - A kind of adjustable ultrasonic nebulization jet nozzle of structural parameters - Google Patents
A kind of adjustable ultrasonic nebulization jet nozzle of structural parameters Download PDFInfo
- Publication number
- CN105618772B CN105618772B CN201610068938.6A CN201610068938A CN105618772B CN 105618772 B CN105618772 B CN 105618772B CN 201610068938 A CN201610068938 A CN 201610068938A CN 105618772 B CN105618772 B CN 105618772B
- Authority
- CN
- China
- Prior art keywords
- water conservancy
- conservancy diversion
- diversion pipe
- lower mould
- pipe bushing
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- 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
-
- 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
Abstract
The present invention provides a kind of adjustable ultrasonic nebulization jet nozzle of structural parameters, including upper die and lower die, water conservancy diversion pipe bushing and mozzle；Wherein upper and lower mould is connected by fastening bolt, and lower mould is provided with two coaxial high-pressure atomisation gas entrances；Water conservancy diversion pipe bushing is fixed through upper and lower mould and by interior tight outer expanding expansion set with upper mould；Both water conservancy diversion pipe bushing bottom and lower mould cooperatively form two air stream outlets；The bottom of the water conservancy diversion pipe bushing is frustum, and lower mould mating part wall curve shape is Laval types, and the air stream outlet is half Laval ring-crack ventilations；Mozzle is located in water conservancy diversion pipe bushing, and runs through water conservancy diversion pipe bushing.The flexible ultrasonic nebulization jet nozzle proposed by the present invention that structural parameters can be adjusted flexibly, the structural parameters of nozzle can be flexibly selected according to the difference of atomization metal, significantly improve the versatility of atomizer.
Description
Technical field
The invention belongs to inert gas atomizer method to prepare attritive powder technical field, and in particular to a kind of structural parameters are adjustable
Ultrasonic nebulization jet nozzle.
Background technology
Gas atomization is the main method for producing metal and alloy powder.Production atomized powder has sphericity height, powder
The advantages that last granularity is controllable, oxygen content is low and adapts to the production of various metals and alloy powder, it has also become high-performance metal and conjunction
The main direction of development of bronze end technology of preparing.
The general principle of gas atomization is to utilize high velocity inert gas shock metal liquid stream, is ground into small molten drop, and
Cool down, be frozen into the process of powder.The core of gas atomization is that the kinetic energy of air-flow is converted into atomized droplet table to greatest extent
Face energy, therefore the rational nozzle of design structure is the premise for obtaining good atomizing effect.United States Patent (USP) P5228620 discloses one
Kind restraint-type close-coupled nozzle, the primary structure form of restraint-type close-coupled nozzle are shown in Fig. 1.Due in the nozzle gas jet with
The distance of molten metal interaction is short, improves inert gas energy utilization efficiency, can produce the more tiny powder of size, its
Shortcoming is due to that the flow distance that water conservancy diversion bore is smaller and metal is in mozzle causes greatly molten metal frozen plug water conservancy diversion
Pipe stops atomization.Mi(J.Mietal,Metal.Mater.Trans.B,1997,28:Etc. 935) ground by numerical computation method
Studied carefully effects of the mozzle prominent length h to gas flowfield in confined type nozzle, it is believed that the swabbing effect on mozzle top with
Prominent length increases and increased, and the possibility of nozzle plugging can be reduced to a certain extent by aspirating the increase of pressure.(A.Int.J.PowderMetal.,1990,26:11) factors such as gas, metal quality flow rate and gas velocity be have studied
To the affecting laws of atomization droplets diameter, the results showed that increase atomization pressure P0Atomization can be reduced with gas mass flow rate G
The quality central diameter d of metal dust50.Because requirement of the atomization to technological parameter of different metal is inconsistent, for different atomizations pair
As needing different atomization parameters, and above-mentioned patent is related to nozzle because structural limitations are difficult to realize gas mass flow and lead
Flow tube prominent length is adjusted flexibly, and reduces the versatility of atomizer.
The content of the invention
In order to improve versatility of the nozzle to various metal atomizations, the present invention provides a kind of adjustable supersonic speed of structural parameters
Atomizer, the structural parameters of nozzle can be flexibly selected according to the difference of atomization metal.
Realize that technical scheme is as follows：
A kind of adjustable ultrasonic nebulization jet nozzle of structural parameters, including upper die and lower die, water conservancy diversion pipe bushing and mozzle；
Wherein upper and lower mould is connected by fastening bolt, and lower mould is provided with two coaxial high-pressure atomisation gas entrances；Water conservancy diversion pipe bushing runs through
Upper and lower mould is simultaneously fixed by interior tight outer expanding expansion set with upper mould；Both water conservancy diversion pipe bushing bottom and lower mould cooperatively form two gas
Flow export；The bottom of the water conservancy diversion pipe bushing is frustum, and lower mould mating part wall curve shape is Laval types, the gas
Flow export is half Laval ring-crack ventilations；Mozzle is located in water conservancy diversion pipe bushing, and runs through water conservancy diversion pipe bushing.
Water conservancy diversion pipe bushing of the present invention cooperatively forms the gas outlet aerodynamic configuration of nozzle with lower mould, and can be by unclamping expansion set
On nut adjustment relative position between the two, by adjusting mutual position between water conservancy diversion pipe bushing and mozzle and lower mould
Put, thus it is possible to vary the prominent length h and nozzle gas outlet sectional area A of mozzle*, nozzle can be realized under identical atomizing pressure
Different gas mass flow rates and suction pressure are obtained, meets the atomization demand of different metal.
Further, mozzle prominent length h of the present invention is adjusted in 1~8mm, gas outlet width d0In 0.2~1.0mm
Interior adjustment, the cone-apex angle β of water conservancy diversion pipe bushing is 0~45 °.
The flexible ultrasonic nebulization jet nozzle proposed by the present invention that structural parameters can be adjusted flexibly, can be according to atomization metal
The flexible selection nozzles of difference structural parameters, significantly improve the versatility of atomizer.With following beneficial effect：
(1) a set of nozzle can be utilized to obtain gas with various mass flowrate by adjusting the relative position of water conservancy diversion pipe bushing,
Versatility of the nozzle to various metal atomizations can be improved.The gas outlet of atomizer uses half Laval type structures, the knot simultaneously
Structure is accelerating air velocity, can ensure while obtaining supersonic atomization air-flow when changing water conservancy diversion pipe bushing relative position only
Change the size of the gas outlet of nozzle without changing its aerodynamic configuration.
(2) mozzle uses split-type design with its bushing, and water conservancy diversion pipe bushing forms the gas of atomizing gas outlet with lower mould
Dynamic profile.Split-type design can choose difference in addition to it can adjust relative position between the two when being atomized different metal
Mozzle, prevent from polluting metal.Be atomized simultaneously after the completion of during mozzle cleaning recycling, set using split type
Meter can make the aerodynamic configuration of protection bushing exempt from destruction.
Brief description of the drawings
Fig. 1 is restraint-type close coupling atomizing nozzle structure schematic diagram.
Fig. 2 is supersonic speed flexibility atomizing nozzle structure schematic diagram.
Fig. 3 is atomized metal pow der grading curve.
Wherein, 1 is air stream outlet, and 2 be mozzle, and 3 be fastening bolt, and 4 be upper mould, and 5 be atomization gas entrance, and 6 be mist
Change gas vent, 7 be lower mould, and 8 be water conservancy diversion pipe bushing, and 9 be expansion set, and 10 be mozzle.
Embodiment
In conjunction with embodiment, accompanying drawing, the invention will be further described：
As shown in Fig. 2 a kind of adjustable ultrasonic nebulization jet nozzle of structural parameters of the present invention, including upper mould 4, lower mould 7, water conservancy diversion
Pipe bushing 8 and mozzle 10；Wherein upper and lower mould is connected by fastening bolt 3, and lower mould is provided with two coaxial high-pressure atomization gas
Body entrance 5；Water conservancy diversion pipe bushing 8 is fixed through upper and lower mould and by interior tight outer expanding expansion set 9 with upper mould 4, water conservancy diversion pipe bushing 8 and
Relative position between upper and lower mould can be adjusted by unclamping the nut on expansion set 9；The lower half of water conservancy diversion pipe bushing 8 is with
Both moulds 7 cooperatively form two air stream outlets 6；The bottom of the water conservancy diversion pipe bushing 8 is frustum, the lower mating part wall of mould 7
Curve shape is Laval types, and the air stream outlet 6 is half Laval ring-crack ventilations；Mozzle 10 is located in water conservancy diversion pipe bushing 9, and passes through
Flow tube bushing 9 is perforated, mozzle 10 uses split-type design with water conservancy diversion pipe bushing 9, can flexibly be chosen the two position by regulation
Required mozzle prominent length.
Its general principles：
(1) gas mass flow rate is adjusted：The nut on expansion set 9 is unclamped, water conservancy diversion pipe bushing 8 can be moved up and down freely, its
It can be changed with the relative position of lower mould 7, the sectional area for the ring-crack ventilation air stream outlet that both form can change.Such as Fig. 2
It is shown, design gas outlet sectional area A in nozzle*With circumferential weld width d*In the presence of following relation：
Wherein r*For circumferential weld gas outlet aditus laryngis external diameter, β is the cone-apex angle of water conservancy diversion pipe bushing bottom.
Jet expansion gas mass flow rate G can be calculated by following formula：
Wherein P0、ρ0It is respectively pressure, density and the specific heat ratio of atomization gas with γ.And according to(A.
Int.J.PowderMetal.,1990,26:11) empirical equation provided, atomized droplet quality central diameter d50With gas mass flow rate
Following relation be present in G：
Wherein：D is draft-tube diameter, and μ, n are experimental constant, and ξ is the ratio between liquid metal density and dynamic viscosity, and M is gold
Belong to liquid mass flowrate, ρmAnd γmRespectively molten metal density and specific heat ratio, v are atomizing gas velocities.
The mass flowrate G for understanding atomization gas by formula (3) has considerable influence to the quality central diameter of atomized droplet, and of the invention
The atomizer being related to can reach not change and realize under the conditions of atomizing pressure and change gas stream by adjusting the structural parameters of nozzle
The effect of rate, meets the needs of different metal or same metal difference atomizing particle size.Simultaneously because the wall of water conservancy diversion pipe bushing 9 is bent
Line is straight line, therefore its change in location can't change the aerodynamic configuration of air stream outlet 6, simply changes the width of circumferential weld, and
The useful effect part wall curve of lower mould 7 is Laval types, and half Laval type air outlet structure shapes are formd with water conservancy diversion pipe bushing 9
Formula；
(2) mozzle prominent length is adjusted：Mozzle 10 uses split-type design with water conservancy diversion pipe bushing 9, between the two phase
Mutual position can change, and can flexibly choose required mozzle prominent length.
Illustrate by taking atomization of the flexible ultrasonic nebulization jet nozzle of the present invention to 7055 alloys as an example, the present invention is specific real
It is as follows to apply mode：
(1) nozzle structural parameters are adjusted, choose mozzle prominent length h=6mm, gas outlet width d0=0.5mm；
(2) 7055 precursor alloys are subjected to melting to 800 DEG C in vacuum or inert gas shielding atmosphere；
(3) molten metal bath enters high-speed gas range of atomization by mozzle 10, while opens atomization argon gas supply dress
Put, 7055 alloys of melting are atomized when being atomized pressure and being 0.8MPa；
(4) metal dust is collected after the completion of being atomized, chooses test sample A；
(5) nozzle structural parameters are readjusted, choose gas outlet width d0=0.6mm, (2)~(4) step is repeated, obtained
Test sample B；
(6) particle size distribution test is carried out using laser particle size analyzer to sample A, B, is atomized the granularity of 7075 alloy powders
Distribution curve is as shown in Figure 3.
Sample A, B quality central diameter d50(accumulated quality fraction reaches powder diameter when 50%) be respectively 62.3 μm and
30.5 μm, the high-efficient atomizing of metal can be achieved in the case where being atomized pressure less than 1MPa for design nozzle.Powder according to given by Fig. 3
Grain size analysis curve can be seen that under identical atomization pressure, d0Powder quality central diameter diminishes during=0.6mm, and distributed area
There is the trend that narrows.By above-mentioned analysis, flexible nozzle proposed by the present invention can be obtained not by changing its structural parameters
Same atomization condition, the versatility of nozzle is improved, nozzle arrangements can be adjusted according to the demand of different atomization metals, together
When can also be by adjusting the particle diameter of nozzle arrangements design metal dust.
In summary, presently preferred embodiments of the present invention is these are only, is not intended to limit the scope of the present invention.
Within the spirit and principles of the invention, any modification, equivalent substitution and improvements made etc., it should be included in the present invention's
Within protection domain.
Claims (2)
1. a kind of adjustable ultrasonic nebulization jet nozzle of structural parameters, it is characterised in that including upper mould (4), lower mould (7), mozzle
Bushing (8) and mozzle (10)；Wherein upper and lower mould is connected by fastening bolt (3), and lower mould is provided with two coaxial high pressures
Atomization gas entrance (5)；Water conservancy diversion pipe bushing (8) is through upper and lower mould and fixed by interior tight outer expanding expansion set (9) and upper mould (4)；
Both water conservancy diversion pipe bushing (8) bottom and lower mould (7) cooperatively form two air stream outlets (6)；The bottom of the water conservancy diversion pipe bushing (8)
For frustum, lower mould (7) mating part wall curve shape is Laval types, and the air stream outlet (6) is half Laval ring-crack ventilations；
Mozzle (10) is located in water conservancy diversion pipe bushing (8), and runs through water conservancy diversion pipe bushing (8).
2. the adjustable ultrasonic nebulization jet nozzle of structural parameters according to claim 1, it is characterised in that mozzle prominent length
H is adjusted in 1~8mm, gas outlet width d0Adjusted in 0.2~1.0mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610068938.6A CN105618772B (en) | 2016-02-01 | 2016-02-01 | A kind of adjustable ultrasonic nebulization jet nozzle of structural parameters |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610068938.6A CN105618772B (en) | 2016-02-01 | 2016-02-01 | A kind of adjustable ultrasonic nebulization jet nozzle of structural parameters |
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| Publication Number | Publication Date |
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| CN105618772A CN105618772A (en) | 2016-06-01 |
| CN105618772B true CN105618772B (en) | 2018-02-13 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109570517B (en) * | 2019-01-17 | 2020-05-12 | 北京科技大学 | Design method of supersonic laval nozzle structure alloy melt atomizer |
| CN109570518B (en) * | 2019-01-22 | 2022-07-08 | 上海材料研究所 | Supersonic gas atomization spray disk for metal powder preparation |
| 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 |
| CN110280774B (en) * | 2019-08-02 | 2021-02-02 | 上海大学 | Metal powder preparation device |
| CN111730060B (en) * | 2020-04-29 | 2021-08-17 | 矿冶科技集团有限公司 | Atomizing spray plate and method for preparing alloy powder with narrow particle size for additive manufacturing through gas atomization |
| CN117505863B (en) * | 2024-01-05 | 2024-04-05 | 季华实验室 | LAVAL type runner, design method thereof and circular seam spray disk |
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| CN1511663A (en) * | 2002-12-30 | 2004-07-14 | 北京有色金属研究总院 | Method and device for reducing heat loss of metal atomizing flow guide system |
| CN101596601A (en) * | 2009-07-09 | 2009-12-09 | 中南大学 | Be used for the atomizer that high efficiency prepares fine metal and alloy powder |
| CN202174243U (en) * | 2011-05-26 | 2012-03-28 | 湖南省冶金材料研究所 | Confined type atomizing nozzle device for preparing metal powder |
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| CN103962565A (en) * | 2014-04-25 | 2014-08-06 | 同济大学 | Accurate liquid guide pipe installing and locating tool and application thereof |
| CN203817397U (en) * | 2014-04-30 | 2014-09-10 | 常州元一新材料科技有限公司 | Device for changing sprayed gas flow angle of gas atomization powder nozzle |
| CN104858439A (en) * | 2015-05-13 | 2015-08-26 | 南京雷瑞新材料科技有限公司 | Spiral flow type titanium and titanium alloy melt superfine atomizing nozzle |
-
2016
- 2016-02-01 CN CN201610068938.6A patent/CN105618772B/en not_active Expired - Fee Related
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4008651A1 (en) * | 1990-03-17 | 1991-09-19 | Messer Griesheim Gmbh | Mixing chamber - for atomisation of two flowable media |
| CN1511663A (en) * | 2002-12-30 | 2004-07-14 | 北京有色金属研究总院 | Method and device for reducing heat loss of metal atomizing flow guide system |
| CN101596601A (en) * | 2009-07-09 | 2009-12-09 | 中南大学 | Be used for the atomizer that high efficiency prepares fine metal and alloy powder |
| CN202174243U (en) * | 2011-05-26 | 2012-03-28 | 湖南省冶金材料研究所 | Confined type atomizing nozzle device for preparing metal powder |
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| CN203817397U (en) * | 2014-04-30 | 2014-09-10 | 常州元一新材料科技有限公司 | Device for changing sprayed gas flow angle of gas atomization powder nozzle |
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