CN104353839B - A kind of single-stage merges the ultrasonic nebulization jet nozzle of laval Yu hartmann structure - Google Patents
A kind of single-stage merges the ultrasonic nebulization jet nozzle of laval Yu hartmann structure Download PDFInfo
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Abstract
The present invention relates to a kind of single-stage and merge the ultrasonic nebulization jet nozzle of laval Yu hartmann structure, including liquid guiding cavity, the lower section of liquid guiding cavity is provided with jet hole, the surrounding of liquid guiding cavity is surrounded with annular high voltage inlet chamber, high pressure admission chamber inner sidewall offers inlet channel, high pressure admission chamber is connected with jet hole by inlet channel, inlet channel is by entry conductor, delivery channel, the hartmann twin-stage resonantron structure of the decussation that one-level resonantron and the connection of secondary resonances pipe are formed, wherein entry conductor and one-level resonantron are positioned at and are same as on a straight line, delivery channel is located along the same line with secondary resonances pipe, and the endcapped of one-level resonantron and secondary resonances pipe, entry conductor is the reducer pipe with laval pipe feature.Compared with prior art, laval pipe feature and decussation hartmann resonantron are blended the inlet channel forming ring pore structures by the present invention, can dramatically increase nozzle atomization efficiency, reduce diameter the particle diameter that the narrows distribution of atomizing particle.
Description
Technical field
The present invention relates to a kind of atomizer, especially relate to a kind of single-stage and merge laval Yu hartmann structure
Ultrasonic nebulization jet nozzle.
Background technology
At present, seal along with modern powder metallurgical technique and the development of high-performance powder metallurgy material and BGA
The development of the advanced technology of preparing such as dress, metal injection molded, thermal spraying, metal rapid shaping 3D printing is all to gold
Belong to powder and propose more stringent requirement, such as powder diameter size and uniformity, mobility etc..Now, suitable
All monopolized by external pulverulent product company with technology major part for the powder market of these advanced technologies of preparing, as
Titanium Powder, Al alloy powder, magnesium alloy powder, stainless steel powder etc., and, its price is up to conventional powder metallurgical
Require more than 5 times of powder.Expensive external raw material and the backwardness of domestic powder technology of preparing, hinder these first
Enter technology of preparing fast development at home, so, development powder prepares correlation technique still urgent needs.
Making a general survey of powder technology of preparing, gas-atomized powder remains high-volume and produces the main work of high-test metal powder
One of process.Gas-atomized powder utilizes high speed compression gas shock motlten metal or alloy stream exactly, by its fragmentation
Process.And atomizing nozzle structure is directly connected to atomization process, powder property and production efficiency, therefore, nozzle
Improvement in structure is of far-reaching significance for the development of powder by atomization with innovation.
Laval superonic flow nozzzle is existing the most frequently used aerosolization form of nozzle, and it mainly can make nozzle obtain Supersonic
Speed air-flow, this is conducive to the refinement of powder.
Chinese patent CN 201807737 U discloses a kind of atomizer for preparing metal dust, including entering
Trachea, upper cover, lower cover, catheter.Upper cover rim vertical is pressed on down from top to bottom and covers.Lower cover horizontal
Centre is arranged to Laval circumferential weld along between the lower end edge and upper cover of vertical.Air inlet pipe and Laval
Circumferential weld is connected.Catheter enters, after upper cover, the district that Laval circumferential weld surrounds in upper cover transverse center position
Territory.Catheter lumen circular in cross-section.On the cross section being parallel to vertical, Laval circumferential weld is sprayed
Air flow stream direction and from catheter flow out molten metal fluidization tower between angle a be 0～10 °.
Domestic also have more shrinkage type or the annular distance of laval type or circumferential weld nozzle now, but includes above-mentioned quoting
Patent is relatively low in the nebulization efficiency of these interior atomizers, being relatively large in diameter of atomizing particle, and particle diameter wider distribution.
And the superonic flow nozzzle with Hartmann resonantron structure mainly can make atomization air flow obtain stable pressure
Vibration, this is conducive to powder diameter uniformity to improve.So, this patent imagination nozzle arrangements energy two combines, from
Particle diameter can be prepared in theory relatively thin, uniformity preferable high quality powder granule.But it is domestic from consulted
From the point of view of outer research report, yet there are no the nozzle pattern being provided simultaneously with both structures.
Summary of the invention
Defect that the purpose of the present invention is contemplated to overcome above-mentioned prior art to exist and a kind of nebulization efficiency is provided
Height, atomizing particle are less, the single-stage of atomizing particle particle diameter narrow distribution merges the super of laval Yu hartmann structure
Velocity of sound atomizer.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of single-stage merges the ultrasonic nebulization jet nozzle of laval Yu hartmann structure, including liquid guiding cavity, liquid guiding cavity
Lower section be provided with jet hole, the surrounding of liquid guiding cavity is surrounded with annular high voltage inlet chamber, on high pressure admission chamber inner sidewall
Offering inlet channel, high pressure admission chamber is connected with jet hole by inlet channel, and described inlet channel is by entrance
The hartmann twin-stage of the decussation that conduit, delivery channel, one-level resonantron and the connection of secondary resonances pipe are formed
Resonantron structure, wherein entry conductor and one-level resonantron are positioned at and are same as on a straight line, delivery channel and secondary resonances
Pipe is located along the same line, and the endcapped of one-level resonantron and secondary resonances pipe, and described entry conductor is for having
The reducer pipe of laval pipe feature.
Described entry conductor, delivery channel, one-level resonantron or secondary resonances pipe are the hole that cross section is rounded or square
Shape structure, described delivery channel, one-level resonantron and secondary resonances pipe are equal aperture passage, described entry conductor
Being a laval gas channel, described entry conductor is first shrunk to throat from arrival end along airflow direction, then along air-flow
Direction, is expanded to the connectivity part of four pipes from throat.
The aperture of described throat is 0.49-0.78 times of the aperture of one-level resonantron；Described delivery channel and two grades are altogether
The aperture of vibration tube is identical, and is equal to the aperture of one-level resonantron.
The constriction tapering of described entry conductor is 40-90 °, and expansion tapering is 5-30 °.
The length of described one-level resonantron is equal with the length of secondary resonances pipe, and all takes 1.6-4.8mm.
Described entry conductor tilts upward with the direction of one-level resonantron, and entry conductor is positioned at downside, described outlet
Diagonally downward, and delivery channel is positioned at downside, the centrage of described entry conductor in the direction of conduit and secondary resonances pipe
Central axis with delivery channel.
Angle between centrage and the liquid guiding cavity centrage of described delivery channel is 20～35 °.
At the outlet of described delivery channel, the vertical dimension of centre-to-centre spacing liquid guiding cavity axis is 1.15～5.50 (larynxs
Aperture, portion+liquid guiding cavity lower diameter).
The quantity of described inlet channel is more than 18.
Connect on the lateral wall in described high pressure admission chamber and have multiple air inlet pipe, and the outside in air inlet pipe and high pressure admission chamber
Wall is tangent, and all of air inlet pipe is that same direction of rotation is arranged relative to axis, high pressure admission chamber, i.e. clockwise side
To or counterclockwise；Simultaneously the entrance point of contact of air inlet pipe be high pressure admission chamber Along ent circumferentially.
Compared with prior art, laval pipe feature and decussation hartmann resonantron are blended shape by the present invention
Become the inlet channel of ring pore structures.Laval pipe feature makes high pressure draught become supersonic jet, and entry conductor knot
Structure, aperture and tapering are arranged than the pressure oscillation that jet can be made to have fixing node length；And hartmann is altogether
Vibration tube makes again another pressure oscillation of fluidic vectoring thrust fixed frequency, by arranging one-level resonantron and secondary resonances pipe
Length makes that the frequency of jet above two pressure oscillation matches and pressure oscillation amplitude is strengthened.Compare traditional
Ultrasonic nebulization jet nozzle, this effect can make this nozzle obtain higher nebulization efficiency, thinner atomizing particle and
Narrower particle size distribution.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the structural representation of inlet channel；
Fig. 3 is the structural representation in high pressure admission chamber and air inlet pipe.
Detailed description of the invention
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment
A kind of ultrasonic nebulization jet nozzle of single-stage fusion laval Yu hartmann structure, as shown in Figure 1 and Figure 2,
Including liquid guiding cavity 1, the lower section of liquid guiding cavity 1 is provided with jet hole 2, and the surrounding of liquid guiding cavity 1 is surrounded with annular high voltage and enters
Air cavity 3, offers inlet channel 4 on medial wall, high pressure admission chamber 3, and inlet channel is passed through in high pressure admission chamber 3
4 connect with jet hole 2, and wherein, the quantity of inlet channel 4 is more than 18.
With reference to Fig. 1 and Fig. 2, inlet channel 4 be by entry conductor 5, delivery channel 6, one-level resonantron 7 and
The hartmann twin-stage resonantron structure of the decussation that secondary resonances pipe 8 connection is formed, wherein entry conductor 5
Being positioned at one-level resonantron 7 and be same as on a straight line, delivery channel 6 is located along the same line with secondary resonances pipe 8,
And the endcapped of one-level resonantron 7 and secondary resonances pipe 8, entry conductor 5 is the change with laval pipe feature
Footpath is managed.Entry conductor 5 tilts upward with the direction of one-level resonantron 7, and entry conductor 5 is positioned at downside, outlet
Diagonally downward, and delivery channel 6 is positioned at downside, in entry conductor 5 in the direction of conduit 6 and secondary resonances pipe 8
Heart line and the central axis of delivery channel 6.Folder between centrage and liquid guiding cavity 1 centrage of delivery channel 6
Angle α is 20～35 °.
Entry conductor 5, delivery channel 6, one-level resonantron 7 or secondary resonances pipe 8 are that cross section is rounded or square
Cavernous structure, delivery channel 6, one-level resonantron 7 and secondary resonances pipe 8 be equal aperture passage, and entrance is led
Pipe 5 is a laval gas channel, entry conductor 5 from arrival end (figure, Si is entrance section) along airflow direction
First it is shrunk to throat, then along airflow direction, is expanded to the connectivity part of four pipes from throat.The aperture S1 of throat is one
0.49-0.78 times of the aperture S2 of level resonantron 7；Delivery channel 6 is identical with the aperture S3 of secondary resonances pipe 8,
And it is equal to the aperture S2 of one-level resonantron 7.The constriction taper theta 1 of entry conductor 5 is 40-90 °, expands
Open part taper theta 2 and be 5-30 °.Length LH1 of one-level resonantron 7 and length LH2 of secondary resonances pipe 8
Equal, and all take 1.6-4.8mm.
At the outlet Se of delivery channel 6, the vertical dimension of centre-to-centre spacing liquid guiding cavity 1 axis is 1.15～5.50 (larynxs
Aperture, portion+liquid guiding cavity lower diameter).
With reference to Fig. 3, the lateral wall in high pressure admission chamber 3 connects and has multiple air inlet pipe 9, and air inlet pipe 9 and high pressure
The lateral wall of inlet chamber 3 is tangent, and all of air inlet pipe 9 is same rotation side relative to axis, high pressure admission chamber 3
To layout, i.e. clockwise or counterclockwise；The entrance point of contact of air inlet pipe 9 is high pressure admission chamber 3 simultaneously
Along ent circumferentially, Fig. 3 is 3 Along ents.
When using the atomizer of the present embodiment, air inlet pipe 9 arranges 1.Inlet porting conduit 5 throat aperture
S1 size is 1mm.
Select 1MPa pressure, during nitrogen atomization, compare original Laval ultrasonic nebulization jet nozzle fine powder rate and improve
17%, the peak width length reduction of powder diameter distribution of peaks 32%.
Select 3MPa pressure, compare original Laval ultrasonic nebulization jet nozzle fine powder rate and improve 31%, powder grain
The peak width length reduction of footpath distribution of peaks 40%.
The above-mentioned description to embodiment is to be understood that for ease of those skilled in the art and use to send out
Bright.These embodiments obviously easily can be made various amendment by person skilled in the art, and at this
The General Principle illustrated is applied in other embodiments without through performing creative labour.Therefore, the present invention does not limits
In above-described embodiment, those skilled in the art are according to the announcement of the present invention, without departing from changing that scope is made
Entering and revise all should be within protection scope of the present invention.
Claims (8)
- null1. the ultrasonic nebulization jet nozzle of single-stage fusion laval Yu a hartmann structure，Including liquid guiding cavity (1)，The lower section of liquid guiding cavity (1) is provided with jet hole (2)，The surrounding of liquid guiding cavity (1) is surrounded with annular high voltage inlet chamber (3)，High pressure admission chamber (3) medial wall offers inlet channel (4)，High pressure admission chamber (3) is connected with jet hole (2) by inlet channel (4)，It is characterized in that，Described inlet channel (4) is by entry conductor (5)、Delivery channel (6)、The hartmann twin-stage resonantron structure of the decussation that one-level resonantron (7) and secondary resonances pipe (8) connection are formed，Wherein entry conductor (5) is located along the same line with one-level resonantron (7)，Delivery channel (6) is located along the same line with secondary resonances pipe (8)，And the endcapped of one-level resonantron (7) and secondary resonances pipe (8)，Described entry conductor (5) is the reducer pipe with laval pipe feature；Described entry conductor (5), delivery channel (6), one-level resonantron (7) or secondary resonances pipe (8) are the cavernous structure that cross section is rounded or square, described delivery channel (6), one-level resonantron (7) and secondary resonances pipe (8) are equal aperture passage, described entry conductor (5) is a laval gas channel, described entry conductor (5) is first shrunk to throat from arrival end along airflow direction, again along airflow direction, the connectivity part of four pipes it is expanded to from throatThe aperture of described throat is 0.49-0.78 times of the aperture of one-level resonantron (7)；Described delivery channel (6) is identical with the aperture of secondary resonances pipe (8), and is equal to the aperture of one-level resonantron (7).
- A kind of single-stage merges the ultrasonic nebulization jet nozzle of laval Yu hartmann structure, it is characterized in that, the constriction tapering (θ 1) of described entry conductor (5) is 40-90 °, and expansion tapering (θ 2) is 5-30 °.
- A kind of single-stage merges the ultrasonic nebulization jet nozzle of laval Yu hartmann structure, it is characterized in that, the length of described one-level resonantron (7) is equal with the length of secondary resonances pipe (8), and all takes 1.6-4.8mm.
- A kind of single-stage merges the ultrasonic nebulization jet nozzle of laval Yu hartmann structure, it is characterized in that, described entry conductor (5) tilts upward with the direction of one-level resonantron (7), and entry conductor (5) is positioned at downside, the direction of described delivery channel (6) and secondary resonances pipe (8) is diagonally downward, and delivery channel (6) is positioned at the central axis of downside, the centrage of described entry conductor (5) and delivery channel (6).
- A kind of single-stage merges the ultrasonic nebulization jet nozzle of laval Yu hartmann structure, it is characterised in that the angle between centrage and liquid guiding cavity (1) centrage of described delivery channel (6) is 20～35 °.
- A kind of single-stage merges the ultrasonic nebulization jet nozzle of laval Yu hartmann structure, it is characterized in that, at the outlet of described delivery channel (6), the vertical dimension of centre-to-centre spacing liquid guiding cavity (1) axis is 1.15～5.50 times of throat aperture and liquid guiding cavity lower diameter sum.
- A kind of single-stage merges the ultrasonic nebulization jet nozzle of laval Yu hartmann structure, it is characterised in that the quantity of described inlet channel (4) is more than 18.
- A kind of single-stage merges the ultrasonic nebulization jet nozzle of laval Yu hartmann structure, it is characterized in that, connect on the lateral wall of described high pressure admission chamber (3) and have multiple air inlet pipe (9), and air inlet pipe (9) is tangent with the lateral wall of high pressure admission chamber (3), all of air inlet pipe (9) is that same direction of rotation is arranged relative to high pressure admission chamber (3) axis, i.e. clockwise or counterclockwise；Simultaneously the entrance point of contact of air inlet pipe (9) be high pressure admission chamber (3) Along ent circumferentially.
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| CN201410553799.7A CN104353839B (en) | 2014-10-17 | 2014-10-17 | A kind of single-stage merges the ultrasonic nebulization jet nozzle of laval Yu hartmann structure |
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| CN201410553799.7A CN104353839B (en) | 2014-10-17 | 2014-10-17 | A kind of single-stage merges the ultrasonic nebulization jet nozzle of laval Yu hartmann structure |
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| CN104353839B true CN104353839B (en) | 2016-08-24 |
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| CN107377984A (en) * | 2017-09-20 | 2017-11-24 | 中国科学院金属研究所 | A kind of double coupled gas atomizers |
| CN109290584A (en) * | 2018-10-23 | 2019-02-01 | 南京理工大学 | A kind of water jacketed copper crucible device for powder by atomization |
| CN115475949A (en) * | 2022-10-12 | 2022-12-16 | 深圳市深汕特别合作区万泽精密科技有限公司 | Spray plate and atomization equipment |
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