CN104353838B - The ultrasonic nebulization jet nozzle of a kind of secondary laval and hartmann structure fusion - Google Patents
The ultrasonic nebulization jet nozzle of a kind of secondary laval and hartmann structure fusion Download PDFInfo
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- CN104353838B CN104353838B CN201410553271.XA CN201410553271A CN104353838B CN 104353838 B CN104353838 B CN 104353838B CN 201410553271 A CN201410553271 A CN 201410553271A CN 104353838 B CN104353838 B CN 104353838B
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Abstract
The present invention relates to the ultrasonic nebulization jet nozzle of a kind of secondary laval and hartmann structure fusion, comprise liquid guiding cavity, the below 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 communicated with jet hole by inlet channel, inlet channel is by entry conductor, delivery channel, one-level resonantron and secondary resonances pipe are communicated with the hartmann twin-stage resonantron structure of the right-angled intersection formed, wherein entry conductor and one-level resonantron are positioned at and are same as on a straight line, delivery channel and secondary resonances pipe are located along the same line, and the endcapped of one-level resonantron and secondary resonances pipe, entry conductor and delivery channel are the variable diameter passage with laval pipe feature.Compared with prior art, laval pipe feature and right-angled intersection hartmann resonantron are merged the inlet channel forming ring pore structures by the present invention mutually, can significantly increase nozzle atomization efficiency, reduce the diameter of atomizing particle and the domain size distribution that narrows.
Description
Technical field
The present invention relates to a kind of atomizer, especially relate to the ultrasonic nebulization jet nozzle of a kind of secondary laval and hartmann structure fusion.
Background technology
At present, along with the development of the advanced technology of preparing such as the development of modern powder metallurgical technique and high-performance powder metallurgy material and BGA Package, metal injection molded, thermal spraying, metal rapid shaping 3D printing all proposes more harsh requirement to metal dust, as powder diameter size and uniformity, mobility etc.Now, be applicable to the powder market of these advanced technologies of preparing and technology major part all by external pulverulent product company is monopolized, as Titanium Powder, Al alloy powder, magnesium alloy powder, stainless steel powder etc., and its price requires more than 5 times of powder up to conventional powder metallurgical.Expensive external raw material and the backwardness of domestic powder preparation technology, hinder these advanced technology of preparing fast developments at home, so, the still active demand of development powder preparation correlation technique.
Make a general survey of powder preparation technology, gas-atomized powder remains one of major processes producing high-test metal powder in enormous quantities.Gas-atomized powder utilizes high speed compression gas shock motlten metal or alloy stream exactly, the process cracked by it.And atomizing nozzle structure is directly connected to atomization process, powder property and production efficiency, therefore, the improvement on nozzle arrangements 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 airstream, and this is conducive to the refinement of powder.
Chinese patent CN201807737U discloses a kind of atomizer for the preparation of metal dust, comprises air inlet pipe, upper cover, lower cover, catheter.Upper cover rim vertical is pressed on down from top to bottom and covers.Laval circumferential weld is arranged to along between the lower end edge and upper cover of vertical in the transverse center position of lower cover.Air inlet pipe is connected with Laval circumferential weld.Catheter enters the region that Laval circumferential weld surrounds after upper cover is passed at upper cover transverse center position.Catheter lumen circular in cross-section.On the cross section being parallel to vertical, the angle a between the direction of the air flow stream that Laval circumferential weld sprays and the molten metal fluidization tower flowed out from catheter is 0 ~ 10 °.
Domestic annular distance or the circumferential weld nozzle also having now more shrinkage type or laval type, but the nebulization efficiency comprising these atomizers of above-mentioned referenced patents is lower, and the diameter of atomizing particle is comparatively large, and domain size distribution is wider.
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 and improves.So this patent imagination nozzle arrangements energy two combines, and can prepare particle diameter theoretically comparatively thin, the good high quality powder particle of uniformity.But from the domestic and international research report of having consulted, yet there are no the nozzle pattern simultaneously possessing these two kinds of structures.
Summary of the invention
Object of the present invention is exactly the ultrasonic nebulization jet nozzle providing a kind of nebulization efficiency is high, atomizing particle is less, atomizing particle domain size distribution is narrower secondary laval and hartmann structure fusion in order to overcome defect that above-mentioned prior art exists.
Object of the present invention can be achieved through the following technical solutions:
The ultrasonic nebulization jet nozzle of a kind of secondary laval and hartmann structure fusion, comprise liquid guiding cavity, the below 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 communicated with jet hole by inlet channel, described inlet channel is by entry conductor, delivery channel, one-level resonantron and secondary resonances pipe are communicated with the hartmann twin-stage resonantron structure of the right-angled intersection formed, wherein entry conductor and one-level resonantron are positioned at and are same as on a straight line, delivery channel and secondary resonances pipe are located along the same line, and the endcapped of one-level resonantron and secondary resonances pipe, described entry conductor and delivery channel are the variable diameter passage with laval pipe feature.
Described entry conductor is first shrunk to one-level throat from arrival end along airflow direction, again along airflow direction, be expanded to the connectivity part of four pipes from one-level throat, described delivery channel is first shrunk to secondary throat from the connectivity part of four pipes along airflow direction, again along airflow direction, from secondary, throat is expanded to the port of export.
Described entry conductor, delivery channel, one-level resonantron or secondary resonances pipe are the rounded or square cavernous structure in cross section; Described one-level resonantron and secondary resonances pipe are equal aperture passage, and described one-level resonantron is equal with secondary resonances pore footpath;
The aperture of described entry conductor expansion rear end is equal with one-level resonantron aperture, is 1.3 ~ 2 times of aperture, place of one-level throat;
The aperture that described delivery channel shrinks front end is equal with secondary resonances pore footpath, and the aperture of the port of export of described delivery channel is 1.15-1.57 times of one-level throat aperture;
Described secondary throat aperture is 1.1 times of one-level throat aperture.
The tapering of described entry conductor constriction is 40 ~ 90 °, and the tapering of expansion is 5 ~ 30 °;
The tapering of described delivery channel constriction is 5 ~ 30 °, and the tapering of expansion is 43 ~ 62 °.
The length of described one-level resonantron is equal with the length of secondary resonances pipe, and length is taken as the 1.47-2.89 of one-level throat diameter doubly.
The direction of described entry conductor and one-level resonantron tilts upward, and entry conductor is positioned at downside, the direction of described delivery channel and secondary resonances pipe is tilted to down, and delivery channel is positioned at downside, the center line of described entry conductor and the central axis of delivery channel.
Angle between the center line of described delivery channel and liquid guiding cavity center line is 20 ~ 35 °.
The vertical range of the port of export centre-to-centre spacing liquid guiding cavity axis of described delivery channel is 1.01 ~ 3.31 (one-level throat aperture+liquid guiding cavity lower diameter).
The quantity of described inlet channel is greater than 18.
The lateral wall in described high pressure admission chamber is connected with multiple air inlet pipe, and the lateral wall in air inlet pipe and high pressure admission chamber is tangent, all air inlet pipe are that same direction of rotation is arranged relative to axis, high pressure admission chamber, i.e. clockwise direction or counter clockwise direction; The entrance point of contact of air inlet pipe is place, high pressure admission chamber Along ent circumferentially simultaneously.
Compared with prior art, laval pipe feature and right-angled intersection hartmann resonantron are merged the inlet channel forming ring pore structures by the present invention mutually.Laval pipe feature on entry conductor makes high pressure draught become supersonic jet, Laval pipe feature on delivery channel makes supersonic speed incoming flow obtain necessarily stronger pressure oscillation, ad hoc secondary throat and one-level throat aperture are than the pressure oscillation that jet can be made to have fixing node length, and, on ad hoc delivery channel, the taper theta 4 of expansion makes pressure wave first node position reach as far as possible far away, pressure wave intensity is as far as possible large, makes pressure oscillation act on the atomization of metal liquid stream most effectively; And hartmann resonantron makes another pressure oscillation of fluidic vectoring thrust fixed frequency, make that the frequency of the above-mentioned two kinds of pressure oscillations of jet matches by the length arranging one-level resonantron and secondary resonances pipe 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 structural representation of the present invention;
Fig. 2 is the structural representation of inlet channel;
Fig. 3 is the structural representation of high pressure admission chamber and air inlet pipe.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Embodiment 1
The ultrasonic nebulization jet nozzle of a kind of secondary laval and hartmann structure fusion, as shown in Figure 1, comprise liquid guiding cavity 1, the below 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 madial wall offers inlet channel 4, and high pressure admission chamber 3 is communicated with jet hole 2 by inlet channel 4, and the quantity of inlet channel 4 is greater than 18.
With reference to figure 1, Fig. 2, inlet channel 4 is the hartmann twin-stage resonantron structure being communicated with the right-angled intersection formed by entry conductor 5, delivery channel 6, one-level resonantron 7 and secondary resonances pipe 8, wherein entry conductor 5 and one-level resonantron 7 are positioned at and are same as on a straight line, delivery channel 6 and secondary resonances pipe 8 are located along the same line, and the endcapped of one-level resonantron 7 and secondary resonances pipe 8, entry conductor 5 and delivery channel 6 are the variable diameter passage with laval pipe feature.Entry conductor 5 is first shrunk to one-level throat S1 from arrival end Si along airflow direction, again along airflow direction, the connectivity part of four pipes is expanded to from one-level throat S1, delivery channel 6 is first shrunk to secondary throat S4 from the connectivity part of four pipes along airflow direction, again along airflow direction, be expanded to the port of export from secondary throat S4.
Entry conductor 5, delivery channel 6, one-level resonantron 7 or secondary resonances pipe 8 is the rounded or square cavernous structure in cross section; One-level resonantron 7 and secondary resonances pipe 8 are equal aperture passage, and one-level resonantron 7 is equal with secondary resonances pipe 8 aperture; The aperture that entry conductor 5 expands rear end S2 is equal with one-level resonantron 7 aperture, is 1.3 ~ 2 times of aperture, S1 place of one-level throat; The aperture that delivery channel 6 shrinks front end S3 is equal with secondary resonances pipe 8 aperture, and the aperture of the port of export Se of delivery channel 6 is 1.15-1.57 times of one-level throat S1 aperture; Secondary throat S4 aperture is 1.1 times of one-level throat S1 aperture.The taper theta 1 of entry conductor 5 constriction is 40 ~ 90 °, and the taper theta 2 of expansion is 5 ~ 30 °; The taper theta 3 of delivery channel 6 constriction is 5 ~ 30 °, and the taper theta 4 of expansion is 43 ~ 62 °.The length LH1 of one-level resonantron 7 is equal with the length LH2 of secondary resonances pipe 8, and length is taken as the 1.47-2.89 of one-level throat S1 diameter doubly.
Entry conductor 5 tilts upward with the direction of one-level resonantron 7, and entry conductor 5 is positioned at downside, and delivery channel 6 is tilted to down with the direction of secondary resonances pipe 8, and delivery channel 6 is positioned at downside, the center line of entry conductor 5 and the central axis of delivery channel 6.Angle α between the center line of delivery channel 6 and liquid guiding cavity 1 center line is 20 ~ 35 °.The vertical range of port of export Se centre-to-centre spacing liquid guiding cavity 1 axis of delivery channel 6 is 1.01 ~ 3.31 (one-level throat aperture+liquid guiding cavity lower diameter).
With reference to figure 3, the lateral wall in high pressure admission chamber 3 is connected with multiple air inlet pipe 9, and air inlet pipe 9 is tangent with the lateral wall in high pressure admission chamber 3, all air inlet pipe 9 are that same direction of rotation is arranged relative to axis, high pressure admission chamber 3, i.e. clockwise direction or counter clockwise direction; The entrance point of contact of air inlet pipe 9 is place, high pressure admission chamber 3 Along ent circumferentially simultaneously, is 3 Along ents in Fig. 3.
When using the atomizer of the present embodiment, air inlet pipe 9 arranges 1.One-level throat S1 pore size on inlet porting conduit 5 is 1mm.
Select 1MPa pressure, during nitrogen atomization, compare original Laval ultrasonic nebulization jet nozzle fine powder rate and improve 22%, the peak width length reduction of powder diameter distribution of peaks 26%.
Select 3MPa pressure, compare original Laval ultrasonic nebulization jet nozzle fine powder rate and improve 34%, the peak width length reduction of powder diameter distribution of peaks 37%.
Above-mentioned is can understand and use invention for ease of those skilled in the art to the description of embodiment.Person skilled in the art obviously easily can make various amendment to these embodiments, and General Principle described herein is applied in other embodiments and need not through performing creative labour.Therefore, the invention is not restricted to above-described embodiment, those skilled in the art, according to announcement of the present invention, do not depart from improvement that scope makes and amendment all should within protection scope of the present invention.
Claims (10)
1. the ultrasonic nebulization jet nozzle of a secondary laval and hartmann structure fusion, comprise liquid guiding cavity (1), the below 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) madial wall offers inlet channel (4), high pressure admission chamber (3) is communicated 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), one-level resonantron (7) and secondary resonances pipe (8) are communicated with the hartmann twin-stage resonantron structure of the right-angled intersection formed, wherein entry conductor (5) and one-level resonantron (7) are positioned at and are same as on a straight line, delivery channel (6) and secondary resonances pipe (8) are located along the same line, and the endcapped of one-level resonantron (7) and secondary resonances pipe (8), described entry conductor (5) and delivery channel (6) are the variable diameter passage with laval pipe feature.
2. the ultrasonic nebulization jet nozzle of a kind of secondary laval according to claim 1 and hartmann structure fusion, it is characterized in that, described entry conductor (5) is first shrunk to one-level throat (S1) from arrival end along airflow direction, again along airflow direction, the connectivity part of four pipes is expanded to from one-level throat (S1), described delivery channel (6) is first shrunk to secondary throat (S4) from the connectivity part of four pipes along airflow direction, again along airflow direction, be expanded to the port of export from secondary throat (S4).
3. the ultrasonic nebulization jet nozzle of a kind of secondary laval according to claim 2 and hartmann structure fusion, it is characterized in that, described entry conductor (5), delivery channel (6), one-level resonantron (7) or secondary resonances pipe (8) are the rounded or square cavernous structure in cross section; Described one-level resonantron (7) and secondary resonances pipe (8) are equal aperture passage, and described one-level resonantron (7) is equal with secondary resonances pipe (8) aperture;
The aperture of entry conductor (5) expansion rear end (S2) is equal with one-level resonantron (7) aperture, is 1.3 ~ 2 times of one-level throat (S1) aperture, place;
The aperture that delivery channel (6) shrinks front end (S3) is equal with secondary resonances pipe (8) aperture, and the aperture of the port of export (Se) of described delivery channel (6) is 1.15-1.57 times of one-level throat (S1) aperture;
Described secondary throat (S4) aperture is 1.1 times of one-level throat (S1) aperture.
4. the ultrasonic nebulization jet nozzle of a kind of secondary laval according to claim 2 and hartmann structure fusion, it is characterized in that, the tapering (θ 1) of described entry conductor (5) constriction is 40 ~ 90 °, and the tapering (θ 2) of expansion is 5 ~ 30 °;
The tapering (θ 3) of described delivery channel (6) constriction is 5 ~ 30 °, and the tapering (θ 4) of expansion is 43 ~ 62 °.
5. the ultrasonic nebulization jet nozzle of a kind of secondary laval according to claim 2 and hartmann structure fusion, it is characterized in that, the length of described one-level resonantron (7) is equal with the length of secondary resonances pipe (8), and length is taken as the 1.47-2.89 of one-level throat (S1) diameter doubly.
6. the ultrasonic nebulization jet nozzle of a kind of secondary laval according to claim 1 and hartmann structure fusion, 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, described delivery channel (6) is tilted to down with the direction of secondary resonances pipe (8), and delivery channel (6) is positioned at downside, the center line of described entry conductor (5) and the central axis of delivery channel (6).
7. the ultrasonic nebulization jet nozzle of a kind of secondary laval according to claim 1 and hartmann structure fusion, it is characterized in that, the angle between the center line of described delivery channel (6) and liquid guiding cavity (1) center line is 20 ~ 35 °.
8. the ultrasonic nebulization jet nozzle of a kind of secondary laval according to claim 1 and hartmann structure fusion, it is characterized in that, the vertical range of the port of export (Se) centre-to-centre spacing liquid guiding cavity (1) axis of described delivery channel (6) is 1.01 ~ 3.31 times of one-level throat aperture and liquid guiding cavity lower diameter sum.
9. the ultrasonic nebulization jet nozzle of a kind of secondary laval according to claim 1 and hartmann structure fusion, is characterized in that, the number of described inlet channel (4) is greater than 18.
10. the ultrasonic nebulization jet nozzle of a kind of secondary laval according to claim 1 and hartmann structure fusion, it is characterized in that, the lateral wall of described high pressure admission chamber (3) is connected with multiple air inlet pipe (9), and air inlet pipe (9) is tangent with the lateral wall in high pressure admission chamber (3), all air inlet pipe (9) are that same direction of rotation is arranged relative to high pressure admission chamber (3) axis, i.e. clockwise direction or counter clockwise direction; The entrance point of contact of air inlet pipe (9) is high pressure admission chamber (3) place Along ent circumferentially simultaneously.
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| CN201410553271.XA CN104353838B (en) | 2014-10-17 | 2014-10-17 | The ultrasonic nebulization jet nozzle of a kind of secondary laval and hartmann structure fusion |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108818880B (en) * | 2018-07-25 | 2023-12-12 | 上海莘临科技发展有限公司 | Omnidirectional running molten sand printing platform and molten sand grain printing forming method |
| CN109382231B (en) * | 2018-10-25 | 2020-08-25 | 辽宁工程技术大学 | Probe-type supersonic pneumatic atomizing nozzle |
| CN111375775A (en) * | 2018-12-27 | 2020-07-07 | 丹阳荣鼎金粉科技有限公司 | Shock wave generator for crushing high-temperature molten metal |
| CN110513044A (en) * | 2019-09-18 | 2019-11-29 | 河南理工大学 | A kind of forming method and device of self-oscillation supercritical carbon dioxide jet stream |
| CN111850332A (en) * | 2020-06-30 | 2020-10-30 | 同济大学 | 3D printing process method of high-strength aluminum-zinc alloy |
| CN111992343B (en) * | 2020-08-28 | 2021-09-14 | 南京工程学院 | Special-shaped combined nozzle jet cavity |
| CN112620058B (en) * | 2020-12-23 | 2022-01-25 | 北京强度环境研究所 | Hartmann sound generator with laval nozzle |
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