CN202131084U - Microparticle capturing device and microparticle transporting device applying same - Google Patents

Abstract

A microparticle capturing device and a microparticle transporting device applying the same are provided, wherein the microparticle capturing device is characterized by including a microjet nozzle, a stabilizer and a hydraulic device supplying jet liquids to the microjet nozzle; an axially penetrative circular jetting chamber is provided in the microjet nozzle; an inner diameter of the circular jetting chamber is matched with a diameter of the microparticle to be captured; an incident port is provided on a top end of the circular jetting chamber; a jet port is provided on a bottom end of the circular jetting chamber; an input end of the stabilizer is connected with a liquid outlet pipe of the hydraulic device; an output end of the stabilizer is connected with the incident port of the microjet nozzle; and the microparticle transporting device includes a base, a workbench, a container holding the microparticle and a bearing. Compared with the prior art, the liquids can be considered to be a medium; the microjet nozzle provided with the circular jetting chamber generates a force supporting the microparticle in an upward way and a circumferential motion rising force which is applied to the microparticle and perpendicular to a jet flow direction; the upward supporting force and the circumferential motion rising force generated by the liquids act on the microparticle together so as to perform a clamping effect on the microparticle and thereby capture the microparticle.

Description

A kind of microparticle acquisition equipment and use the microparticle conveying equipment of this device

Technical field

The utility model relates to a kind of microparticle acquisition equipment, and uses the microparticle conveying equipment that this acquisition equipment is arranged.

Background technology

Along with the continuous extension of scientific research to microscopic fields, micro-fabrication technology and products thereof is obtaining fast development in recent ten years.Countries such as the U.S., Japan, Germany have all placed quite high status to little manufacturing, with it as one of main flow of manufacturing science, development micro-fabrication technology and industry, China is to a breach that high-tech is made a leapleap forward especially.

" stack shaping " is an important idea in little manufacturing field, and through to the controlling of microparticle, stack shaping can superpose " from bottom to top " and pile up or assemble out required two dimension or three-dimensional micro-structural and components and parts.Wherein, to the catching smoothly of microparticle, directed transport, accurately the location is one of key technology and the important foundation of " stack shaping ".Therefore, how to realize catching and controlling and become of current little manufacturing field research focus and difficult point to microparticle.

According to bibliographical information, up to the present, catching and controlling mainly to wait and realize microparticle by means of laser, radio-frequency voltage and plasma.Wherein, " light tweezer " (Optical Tweezers) is that the most representative method is caught and controlled to the realization microparticle; So-called " light tweezer " is to utilize the mechanics effect of momentum transfer between light and material and the three-dimensional gradient optics potential well that forms, is a kind ofly can carry out not damaged and the untouchable instrument of controlling to small items.As far back as 1986; The Ashkin of AT&T Labs introduces high-NA objective with single beam laser and has formed the three-dimensional optical potential well; Prove it and can under the situation that does not influence surrounding environment basically, realize catches is carried out inferior contact, the operation of harmless live body, and be called " light tweezer " visually.Since coming out, " light tweezer " technical development is rapid, and more and more comprehensive to " light tweezer " research that the variety classes laser beam produces, it is used also more and more widely.So far; " light tweezer " by the initial single beam gradient force ligh trap dissimilar optics potential wells such as two light tweezers, three smooth tweezers, four smooth tweezers, array light tweezer, light beam work station and holographic optical tweezer that developed gradually, they provide ingenious effectively instrument for little manufacturing research of catching and control based on microparticle.

Secondly, " dielectric swimming " then is the other a kind of mode that realizes that microparticle is caught and controlled (Dielectrophoresis).People such as the Brown of Harvard University adopt the micro-appearance tweezer folder of contactless three-axle atomic force (TACT); And utilize the dielectric swimming to realize controlling of nano-substance in the aqueous medium; They apply radio-frequency voltage on the needle point of TACT and inner casing; With the earthing of casing, the needle point designed openings lets electric field overflow, and outside the surface, produces one zero electric fields.Because the most of material of the permittivity ratio of water is all big, so water can be pushed nano particle to electric field minimizing position.Owing to belong to the zone of repulsive force around the needle point, thereby can guarantee once to have only a particle to be hunted down.Can catch single semiconductor quantum, CNT, semiconductor nanowires, biologic grain (for example virus) the little microparticle of equal diameter in this way, thereby carry out the assembling of micro-structural and control to 4nm.

In addition, people such as the Huang of Swiss Federal Institute of Technology are by the near-field effect of plasma (Plasma), cooperate microfluid (Microfluidics) and key-course, let catch and control microparticle and be achieved.They develop and the light fluid device of being made up of plasma ligh trap and microfluid (Optofluidic Device), do not need the complicated optics framework of tradition " light tweezer ", just can manipulation cell or microparticle.

Above-mentioned " light tweezer ", " dielectric swimming " and " electromagnetic field " are to realize in the world that at present microparticle catches and control more representational three kinds of modes; But; The realization of above-mentioned three kinds of modes all needs specific hardware device, and building with use cost of whole system is high, and for applied environment higher requirement is arranged also; Main research oriented institute and the researcher that university is engaged in theoretical basis research also can't be used for industrial practice and carry out the commercialization popularization.

The utility model content

The utility model first technical problem to be solved is the microparticle acquisition equipment that a kind of simple in structure, low cost of manufacture is provided and realizes easily to above-mentioned prior art present situation.

The utility model second technical problem to be solved is to above-mentioned prior art present situation and the microparticle conveying equipment that provides a kind of application that above-mentioned microparticle acquisition equipment is arranged, and this microparticle conveying equipment overall structure is simple, low cost of manufacture and realizing easily.

The utility model solves the technical scheme that above-mentioned first technical problem adopted: a kind of microparticle acquisition equipment; It is characterized in that: described microparticle acquisition equipment includes microjet shower nozzle, voltage-stablizer and is the hydraulic means that said microjet shower nozzle provides atomizing of liquids; Offer the annular spray chamber that runs through vertically in the said microjet shower nozzle; This annular spray chamber internal diameter is complementary with the microparticle diameter of desiring to catch; The top of said annular spray chamber is provided with the entrance port; The bottom of said annular spray chamber is provided with jet, and the fluid pipeline of the input of said voltage-stablizer and said hydraulic means links to each other, and the output of this voltage-stablizer links to each other with the entrance port of said microjet shower nozzle.

In order to obtain microparticle capture effect preferably, improve reliability and success rate that microparticle is caught, as preferably, satisfy following relational expression: Φ between the internal diameter of said annular spray chamber and the diameter of said microparticle _w-10 μ m≤Ψ _Pi≤Φ _w, wherein, Ψ _PiThe internal diameter of representing said annular spray chamber, Φ _wThe diameter of representing said microparticle, said Ψ _PiAnd Φ _wUnit be μ m.

For the ease of processing and replacing; As preferably, described microjet shower nozzle includes nozzle housing and sprinkler core, offers the through hole that runs through vertically in the said nozzle housing; Said sprinkler core includes core print and core body; Said core print is fixedly connected with the top of said nozzle housing, and said core body is inserted in the said through hole, forms described annular spray chamber between the through-hole wall of said nozzle housing and the core body of said sprinkler core; And, offer on the core print of said sprinkler core and the corresponding inlet opening in said entrance port.

Preferred as further, the cross section that said sprinkler core is cut open along central axis is T-shaped, a plurality of through holes of said inlet opening for circumferentially offering at interval along the core print of said sprinkler core.The sprinkler core of T shape can make things convenient for inserting in different nozzle housings, and the top of T shape is convenient to realize and being connected of core body that a plurality of inlet openings that the sprinkler core upper edge circumferentially distributes can improve the feed liquor amount, accelerate feed liquor speed.

In order on the microjet shower nozzle, to produce the atomizing of liquids of catching the required pressure of microparticle; Said hydraulic means can adopt various hydraulic system of the prior art; Preferably can be following structure: include the plunger displacement pump that can produce hydraulic oil, drive the motor of said plunger displacement pump work and can realize the booster of said atomizing of liquids suction and discharge; Wherein, pass through the connection that a directional control valve is realized hydraulic circuit between said booster and the plunger displacement pump.

For the ease of realizing automation control, as preferably, said directional control valve is connected with the PLC electric control system.

The utility model solves above-mentioned second technical scheme that technical problem adopted: a kind of microparticle conveying equipment is characterized in that: described microparticle conveying equipment includes

Base;

Workbench is arranged on the said base and can does straight line respectively along the length of this base and width and move;

Be contained with the container of microparticle, be fixedly set on the said workbench, the top of said container is provided with the microjet shower nozzle;

Bearing perpendicular to said base setting, is equipped with on the said bearing and can does vertically that straight line moves and perpendicular to the overhanging support of this bearing, an end of said support is fixedly linked with the voltage-stablizer that is arranged on the said microjet shower nozzle.

In order to make workbench can be implemented on the base respectively displacement along X axle and Y axle both direction; As preferably; Said workbench includes first pedestal and second pedestal; Also include first motor and second motor, said base is provided with first guide rail of arranging along its length, and said first pedestal can be done straight line along said first guide rail and move under the driving of said first motor; Said first pedestal is provided with second guide rail of arranging along the width of said base, and said second pedestal can be done straight line along said second guide rail and move under the driving of said second motor.

For the ease of Stroke Control; Make things convenient for the shift position of detection at any time first pedestal and second pedestal; As preferably; The side of said first guide rail is provided with tracking and feeds back the first grating chi of the said first pedestal shift position, and the side of said second guide rail is provided with tracking and feeds back the second grating chi of the said second pedestal shift position.

In order to limit first pedestal and the second pedestal shift motion; Prevent the slippage from the guide rail of first pedestal and second pedestal; Preferred as further; Also be provided with first anticollision device, collision-prevention device of the said first pedestal shift motion of restriction on the said base, said first pedestal is provided with second anticollision device, collision-prevention device of the said second pedestal shift motion of restriction.

In order to guarantee first pedestal and second pedestal at low speed and at a high speed down all possess extremely low thrust ripple, with the at the uniform velocity property of assurance movable workbench and the accuracy of location, as preferably, said first motor and second motor are linear electric motors.

Compared with prior art; The advantage of the utility model is: be medium with liquid; And through the microjet shower nozzle that has annular spray chamber produce a kind of can be to the make progress power of support and of microparticle to the lift that streams perpendicular to jet direction of microparticle; This upwards support force that produces by liquid with stream the lift acting in conjunction in microparticle, and microparticle is had " clamping down on " effect, can as tweezers firmly " pincers " firmly be positioned at the microparticle below the microjet shower nozzle; Thereby realization is caught microparticle, is a kind of new tool and mode of catching microparticle; In addition; The tradition that is compared to this microparticle acquisition equipment adopts laser, radio-frequency voltage and plasma etc. to carry out the device that microparticle catches and is more prone to realize and make, and the device of the utility model just can be built and operated in common daily life environment; Do not need the certain applications environment; Greatly reduce the realization cost of acquisition equipment, help promoting the use of of acquisition equipment, enlarged application scenario and field.

Description of drawings

Fig. 1 is the microparticle acquisition equipment structural representation of the utility model.

Fig. 2 is the microparticle acquisition equipment fundamental diagram of the utility model.

Fig. 3 is an I portion partial enlarged drawing (the stressed principle of microparticle) shown in Figure 2.

Fig. 4 is the microjet nozzle structure cutaway view of the utility model.

The microjet boundary layer flow velocity of Fig. 5 the utility model changes and the characteristic sketch map.

Fig. 6 is the microparticle capture technique route map of the utility model.

Fig. 7 is for using the microparticle conveying equipment structural representation that the utility model microparticle acquisition equipment is arranged.

Fig. 8 is the feed system structural representation of microparticle conveying equipment shown in Figure 7.

Fig. 9 is the structure of container cutaway view in the microparticle conveying equipment shown in Figure 7.

Figure 10 is the microparticle transport process structural representation of the utility model.

The specific embodiment

Embodiment describes in further detail the utility model below in conjunction with accompanying drawing.

Like Fig. 1～shown in Figure 6; Microparticle acquisition equipment structural representation and fundamental diagram for present embodiment; This microparticle acquisition equipment includes microjet shower nozzle 1 and the hydraulic means 3 that atomizing of liquids can be provided for microjet shower nozzle 1, and wherein, atomizing of liquids can be water; Also can be for other can make microparticle float over the fluid media (medium) of this liquid surface, it is atomizing of liquids that present embodiment is selected pure water free from foreign meter.

Wherein, Microjet shower nozzle 1 includes nozzle housing 11 and sprinkler core 12; Offer the through hole that runs through vertically in the nozzle housing 11; The cross section that sprinkler core 12 is cut open along central axis is T-shaped, and this sprinkler core 12 includes core print 121 and core body 122, and; Core print 121 is fixedly connected through bolt or screw with the top of nozzle housing 11; 122 in core body is inserted in the through hole of nozzle housing 11, forms an annular spray chamber 13 that runs through vertically between the core body 122 of the through-hole wall of nozzle housing 11 and sprinkler core 12, on the core print 121 also along the circle spacing offer inlet opening 121a that the entrance port 131 of a plurality of abilities and annular spray chamber 13 is connected liquid inlet as whole microjet shower nozzle 1; Make for ease, the through hole of nozzle housing 11 preferably can be shoulder hole, and the large-diameter portion 111 of this shoulder hole is relative with the entrance port 131 of core print, and 112 of the minor diameter parts of shoulder hole are relative with microparticle 9 as jet 132.

Because the bore of microjet shower nozzle 1 is less; Bigger from the fluid pressure of microjet shower nozzle 1 ejection; For the pressure of stable ejection liquid, guarantee that the liquid of microjet shower nozzle 1 ejection can grasp microparticle 9 effectively, also must between microjet shower nozzle 1 and hydraulic means 3, voltage-stablizer 2 be set; The fluid pipeline of the input of this voltage-stablizer 2 and hydraulic means 3 links to each other, and the output of this voltage-stablizer 2 links to each other through the inlet opening 121a of core print 121 and the entrance port 131 of annular spray chamber 13.

The hydraulic means 3 that present embodiment adopted can be various hydraulic systems of the prior art; Preferably, can adopt following structure: this hydraulic means 3 includes the motor 32 of plunger displacement pump 31,31 work of actuation plunger pump and can realize the booster 33 that atomizing of liquids sucks and discharges, wherein; Booster 33 is connected with inlet pipeline 331 and outlet pipeline 332; Be communicated with through hydraulic circuit 35 between booster 33 and the plunger displacement pump 31, on this hydraulic circuit 35, directional control valve 34 be installed, direction of passage control valve 34 makes hydraulic oil alternately get into the piston both sides of booster 33; Directional control valve 34 is controlled through control circuit by PLC electric control system 36; Realize the form of the adjusting of supercharging scope with the microjet 14 of control output, the PLC electric control method is a prior art, and present embodiment is not done and given unnecessary details.During hydraulic means 3 work; Motor 32 drives plunger displacement pump 31 output hydraulic oil and alternately gets into the piston both sides in the booster 33 along hydraulic circuit 35, thereby driven plunger moves back and forth, and realizes that booster 33 both sides alternately suck current, extrude current; The current of output are behind voltage-stablizer 2 steady pressures; Aqueous water gets in the annular spray chamber 13 through the inlet opening 121a on the core print 121, and from jet 132 ejections, finally forms microjet 14.

Below set forth in detail the generation condition and the operation principle of the microparticle acquisition equipment of present embodiment.

When the microjet 14 that is penetrated by microjet shower nozzle 1 flow through microparticle 9 surfaces, because the liquid-solid interface effect can form one deck boundary layer on microparticle surface 93, the fluid micellar in the boundary layer was blocked by viscous force; Consume kinetic energy; Flow velocity reduces, therefore, and the closer to the fluid micellar on microparticle surface 93; The viscous force that receives is big more, so flow velocity reduces soon more.

Present embodiment adopts spherical coordinate system that liquid-solid boundary layer jet is distributed and pressure change is analyzed; Get a vertical plane,, get a circular cutting plane at place, microparticle maximum cross-section and microparticle quadrature; First intersection point A with microjet 14 and microparticle surface 93 is the origin of coordinates; Choosing section line along microparticle surface 93 is the X axle, is directed downwards, and the Y axle is vertical with microparticle surface 93.

Choose A, B, C, D and five points of E on microparticle surface 93; Referring to Fig. 5, wherein, the A point is to the C point; Be step-down accelerating sections (i.e.

); In this section, though viscous force has caused the loss of fluid micellar kinetic energy, because the part pressure energy of fluid is converted into the kinetic energy of fluid; This loss can be remedied, and makes fluid still have enough kinetic energy to move on; The C point is a turning point; C point place flow velocity is maximum, and barometric gradient is zero (i.e.

); After the C point; Be supercharging braking section (i.e.

); The part kinetic energy of fluid not only will change pressure energy in this section; And the retardation of viscous force also will continue to consume kinetic energy, accelerates so fluid velocity reduces process, and its boundary layer constantly thickens; When fluid flow to certain 1 D on microparticle surface 93, near the kinetic energy of the fluid micellar on surface approach exhaustion, the fluid micellar here just stagnated, and at this moment, the D point is called burble point.The boundary layer flow bulk properties on microparticle surface 93 is as shown in table 1.

The boundary layer flow bulk properties on table 1 microparticle surface

Table 1 specifies as follows: the boundary layer on microparticle surface 93 appears at the thin district of one deck VISCOUS FLOW of the surface of solids when being liquid-solid the contact, when microjet 14 contacted with microparticle surface 93, the fluid micellar in the boundary layer was blocked by viscous force, consumes kinetic energy.The closer to the fluid micellar on microparticle surface 93, the viscous force that receives is big more, and flow velocity reduces soon more.

Can know by table 1; Microparticle surface 93 is in the favorable pressure gradient state from A point to the pairing boundary layer of C point; Thereby help to overcome the shearing stress on microparticle surface 93 along the active force of boundary layer flow direction, the mobile of boundary layer inner fluid there is the speedup effect, thereby weakened the growth rate of boundary layer thickness; Boundary layer thickness increases little, and this section is the step-down accelerating sections of fluid; During to turning point C, flow velocity increases to maximum, and barometric gradient reduces to zero; Be in the adverse pressure gradient state after the C point, the moving reciprocal active force of longshore current has decelerating effect to boundary layer flow, thereby has strengthened the growth rate of boundary layer thickness, causes the boundary layer progressive additive; If adverse pressure gradient is enough big; Then the change of flow direction possibly take place on microparticle surface 93 in fluid; Like the point of the D among Fig. 5 (burble point; The fluid state of front and back is respectively

and

) shown in; Therefore; From the beginning of D point, the boundary layer will break away from microparticle surface 93, cause the separation in boundary layer.

After the D point, the fluid micellar in the microparticle latter half boundary layer will receive bigger retardance, cause the segment fluid flow micelle to be compelled reverse flow; Force the boundary layer to continue to leave microparticle surface 93; Because the appearance that refluxes makes microjet 14 form symmetrical vortex 141 (being called the stream that circles round again) in the bottom of microparticle, symmetrical vortex 141 is in the bottom of microparticle; Microparticle has been played supporting role, referring to Fig. 2.Simultaneously; Microjet 14 the power on the microparticle of acting on also has streams lift 92, microparticle stressed as shown in Figure 3, the support force 91 of the surface tension of liquid level, symmetrical vortex 141 and stream lift 92 actings in conjunction in microparticle perpendicular to jet direction; It has been produced the effect of clamping down on; And finally form a kind of by liquid form can the clamping small items " tweezers ", be similar to " light tweezer " the same can realize the instrument that microparticle is caught because present embodiment adopts the atomizing of liquids of water as microjet 14; Therefore, we are referred to as " water tweezer ".

Briefly; Because the characteristic of microparticle and fluid boundary layer, the boundary layer produces and the development backward along microparticle surface 93 from the leading edge of microparticle, in the contrary nip that microparticle surface 93 pressure increase; The boundary layer will be separated from microparticle surface 93; Force between microparticle surface 93 and the boundary layer fluid reverse reflux to occur, and induce the microparticle bottom symmetrical vortex 141 (stream circles round) to occur, thereby form upwards support force 91 microparticle; Simultaneously, microjet 14 is owing to receive the inhibition of microparticle, with forming microparticle streamed lift 92 perpendicular to jet direction; So, the support force of symmetrical vortex 141 (stream circles round) 91 with stream lift 92 actings in conjunction in microparticle, and then produced " clamping down on " effect, and final form " water tweezer " to microparticle.

Further, adopt method of singularities calculation specifications microjet 14 to form the condition of " water tweezer ".Is an intensity that the dipole of M is placed on origin of coordinates place, and with the jet stack, then the stream function Ψ in the synthetic flow field stream function Ψ that should be jet penetrates the stream function Ψ with dipole _IdolAddition, that is:

When Ψ=0, streamline (face) is zero streamline (face), and formula (1) becomes:

$(\frac{1}{2}{\mathrm{vR}}^2-\frac{M}{4\mathrm{\πR}}){\sin }^2\mathrm{\θ}=0---\left(2\right)$

Solve:

$\left.\begin{array}{c}\frac{1}{2}{\mathrm{vR}}^2-\frac{M}{4\mathrm{\πR}}=0\\ \mathrm{\θ}=0,\mathrm{\π}\end{array}\right\}---\left(3\right)$

In the formula (3), first equation is a spherical equation, is write as canonical form to be:

$R^3-\frac{\mathrm{<figure-callout\; id="2"\; label="M"\; filenames="HSA00000460703000071.png"\; state="\{\{state\}\}">M</figure-callout>}}{2\mathrm{\&pi;v}}=0---\left(4\right)$

(4) formula representes that zero streamline (face) is that radius is the microparticle (ball) of

, and second equation in the formula (3) representes that then the z axle also is zero streamline (face) in addition.

Therefore, if expect that jet is the flow field of the microparticle of a around a radius, then the intensity of dipole must be:

M＝2πa ³v (5)

With promptly getting jet after formula (5) the substitution formula (1) is the mobile stream function of microparticle of a around radius:

$\mathrm{\&psi;}=\frac{1}{2}{\mathrm{vR}}^2[1-{\left(\frac{a}{R}\right)}^3]{\mathrm{<figure-callout\; id="2"\; label="sin"\; filenames="HSA00000460703000071.png"\; state="\{\{state\}\}">sin</figure-callout>}}^2\mathrm{\&theta;}---\left(6\right)$

Jet around radius be velocity potential function Φ that the microparticle of a flows should be the jet potential function with M=2 π a ³V is the velocity potential function sum of the dipole of intensity, that is:

$\mathrm{\&Phi;}=\mathrm{vR}\cos \mathrm{\&theta;}+\frac{M}{4\mathrm{\&pi;}{\mathrm{<figure-callout\; id="2"\; label="R"\; filenames="HSA00000460703000071.png"\; state="\{\{state\}\}">R</figure-callout>}}^2}\cos \mathrm{\&theta;}=\mathrm{vR}\cos \mathrm{\&theta;}+\frac{{2\mathrm{\&pi;a}}^{3}v}{{4\mathrm{\&pi;<figure-callout\; id="2"\; label="R"\; filenames="HSA00000460703000071.png"\; state="\{\{state\}\}">R</figure-callout>}}^2}\cos \mathrm{\&theta;}=\mathrm{vR}[1+\frac{1}{2}{\left(\frac{a}{R}\right)}^3]\cos \mathrm{\&theta;}---\left(7\right)$

Above formula (1) is in (7): ψ is a stream function; Φ is a velocity potential function; V is an effluxvelocity; A is the microparticle radius; M is the intensity of space dipole; θ is certain point and the line of dipole and the angle between the Z axle forward in the flow field; R is the distance between certain point and the dipole in the flow field.

Can also obtain the position that burble point D is ordered through calculating.Wherein, the speed of any point is in the flow field:

$\left.\begin{array}{c}{v}_R=\frac{\&PartialD;\mathrm{\&Phi;}}{\&PartialD;R}=v[1-{\left(\frac{a}{R}\right)}^3]\cos \mathrm{\&theta;}\\ v_{\mathrm{\&theta;}}=\frac{1}{R}\frac{\&PartialD;\mathrm{\&Phi;}}{\&PartialD;\mathrm{\&theta;}}=-v[1+\frac{1}{2}{\left(\frac{a}{R}\right)}^3]\sin \mathrm{\&theta;}\end{array}\right\}---\left(8\right)$

On microparticle surface 93, R=a is arranged, the substitution following formula get final product the speed of jet on microparticle surface 93:

$\left.\begin{array}{c}{v}_R=0\\ v_{\mathrm{\&theta;}}=-\frac{3}{2}v\sin \mathrm{\&theta;}\end{array}\right\}---\left(9\right)$

When θ equals 0 when the π, v _θ=0, i.e. the moment of jet contact microparticle and the speed at following quartile place are zero, and this has also explained why can produce the whirlpool of circling round.

So; Burble point D point occurs in maximal rate and locates for

, and speed is:

${\left|v_{\mathrm{\&theta;}}\right|}_{\max }=\frac{3}{2}v---\left(10\right)$

Therefore; Rule according to stream function and velocity potential function; Just can control flow velocity and the pressure of microjet 14 on microparticle surface 93; And and then the position of control burble point D, make microjet 14 can form symmetrical vortex 141 (stream circles round) in the microparticle bottom, realization is to the support of microparticle 9 and clamp down on effect.

In sum; Form " the water tweezer " of optimum efficiency; Must be to carrying out rational Match like parameters such as effluxvelocity, microparticle radius, microjet shower nozzle 1 internal diameters; And, improve the success rate of catching in order to realize the effect of clamping down on of " water tweezer " reliably, also should satisfy following relational expression: Φ between the internal diameter of the annular spray chamber 13 of microjet shower nozzle 1 and the diameter of microparticle 9 _w-10 μ m≤Ψ _Pi≤Φ _w, wherein, Ψ _PiThe internal diameter of representing annular spray chamber 13, Φ _wThe diameter of expression microparticle 9, Ψ _PiAnd Φ _wUnit be μ m.

As shown in Figure 6, catch the technology path of microparticle for " the water tweezer " of present embodiment.At first; Produce microjet 14 by hydraulic means 3 through microjet shower nozzle 1, microjet 14 has formed " water tweezer " on microparticle 9 surfaces in the process of directive microparticle 9; Control through vision; Can carry out parameter optimization (like parameters such as adjustment effluxvelocity, microparticle radius, microjet shower nozzle 1 internal diameters) to " water tweezer ", thereby form stable " water tweezer ", utilize " water tweezer " that microparticle 9 is caught and controlled again.

Be convenient observation and operation to microparticle 9 acquisition procedures, microparticle 9 for water insoluble and can bubble through the water column on the plastics fluorescent grain, it is to help vision track and photographic images that microparticle 9 is selected the purpose of fluorescent grains.The parameter that present embodiment is chosen is specific as follows: the annular spray chamber 13 internal diameter Ψ of microjet shower nozzle 1 _Pi=145 μ m, the annular spray chamber 13 external diameter Ψ of microjet shower nozzle 1 _Po=400 μ m, microparticle 9 diameter of phi _w=150 μ m, the internal diameter of water bundle and microparticle 9 diameters are complementary, and promptly satisfy relational expression: Φ between the diameter of the internal diameter of the annular spray chamber 13 of microjet shower nozzle 1 and microparticle 9 _w-10 μ m≤Ψ _Pi≤Φ _w, jet pressure is 2000bar; So, be the annular water bundle of hollow from the microjet 14 of microjet shower nozzle 1 ejection, through forming the equal uniform flow of stable performance behind the voltage-stablizer 2:

(1), during the microparticle 9 on the microjet 14 directive liquid levels, can cause the disturbance of liquid level, liquid level produces surface tension;

(2), when microjet 14 receives stopping of microparticle 9, produce and to stream lift 92 perpendicular to the jet flow direction;

(3), when microjet 14 during from microparticle 9 surperficial landings; Can form symmetrical vortex 141 (stream circles round) in the bottom of microparticle 9; Symmetry vortex 141 (stream circles round) produces power upwards, is supported on the bottom of microparticle 9, thereby microparticle 9 receives the effect of support force 91 upwards;

(4), support force 91 and stream lift 92 and directly act on microparticle 9, vise microparticle 9 as tweezers, form by " water tweezer ";

(5), microparticle 9 under the effect of making a concerted effort, be wrapped in the inside of hollow microjet 14, when upwards making a concerted effort with microparticle 9 self gravitation balances, microparticle 9 has just rested on a certain position, inside of water bundle, can realize " water tweezer " catching microparticle 9 then.

The stressing conditions of microparticle 9 is referring to Fig. 3 in the present embodiment, and microparticle 9 receives the inside effect of streaming lift 92, simultaneously; Microparticle 9 also receives the effect of symmetrical vortex 141 (stream circles round) support force 91 upwards, because microparticle 9 is lighter, support force 91 is greater than self gravitation; Therefore, microparticle 9 receives inwardly makes a concerted effort and makes progress, in microjet 14 environment; Symmetry vortex 141 (stream circles round) and pressure reduction acting in conjunction form " water tweezer ", and microparticle 9 can tightly vise microparticle 9 as tweezers under " water tweezer " clamping; Remain at water jets bundle bottom central and be not flushed away, thereby accomplish " water tweezer " catching microparticle 9.

Present embodiment has proposed a kind of new equipment and method of catching microparticle 9---" water tweezer "; The realization of " water tweezer " and enforcement are more easy to be simple; Help applying; For realizing a kind of novel technological means being provided in little manufacturing field, have important significance for theories and potential using value to " stack shaping " of microparticle 9.

Like Fig. 7～shown in Figure 10, a kind of microparticle conveying equipment of the microparticle acquisition equipment of present embodiment is arranged for application, this microparticle conveying equipment includes

Base 4;

Workbench; Include first pedestal 51 and second pedestal 52; Also include first motor and second motor, base 4 is provided with along its length first guide rail, 511, the first pedestals 51 that (X axle) arrange can edge first guide rail 511 under the driving of first motor be done straight line and move; First pedestal 51 is provided with second guide rail 521 that the width (Y axle) along base 4 is arranged; Second pedestal 52 can be done straight line along second guide rail 521 and move under the driving of second motor, wherein, first motor and second motor are linear electric motors; The side of first guide rail 511 is provided with tracking and feeds back the first grating chi 512 of said first pedestal 51 shift positions; The side of second guide rail 521 is provided with tracking and feeds back the second grating chi 522 of second pedestal, 52 shift positions, and first anticollision device, collision-prevention device, 513, the first pedestals 51 that also are provided with restriction first pedestal 51 shift motions on the base 4 are provided with second anticollision device, collision-prevention device 523 of restriction second pedestal 52 shift motions;

Transparent vessel 6; Be contained with microparticle 9 in the container 6, fixture is arranged at the bottom of container 6, and this fixture can be fixedly set on second pedestal 52 of workbench through bolt; Make container 6 can be fixed on the workbench; Microjet shower nozzle 1 is arranged on the top of container 6, also is provided with the microparticle accommodation box 62 that microparticle 9 stack shapings are used in the container 6, referring to Figure 10;

Bearing 7; Be provided with perpendicular to base 4; Vertically (Z axle) is installed on the bearing 7 does that straight line moves and perpendicular to the overhanging support 8 of this bearing 7, support 8 is gone up and down by the 3rd motor-driven, an end of support 8 is fixedly linked with the voltage-stablizer 2 that is arranged on the microjet shower nozzle 1; When support 8 when bearing 7 moves, microjet shower nozzle 1 can vertically be regulated jetting height.

Microparticle conveying equipment in the present embodiment mainly includes microjet shower nozzle 1 part and feeding with high precision system; Microjet shower nozzle 1 produces microjet 14 by hydraulic means 3; The feeding with high precision system makes microjet shower nozzle 1 can aim at the microparticle 9 in the container 6 all the time in order to realize filling container 6 the moving in horizontal plane of microparticle 9; Wherein, the feeding with high precision system adopts linear motor driving, can realize movable workbench on X axle, the Y direction and the up-down that realizes the support 8 on the Z-direction; Linear electric motors can guarantee all possess extremely low thrust ripple at low speed and at a high speed, guaranteeing at the uniform velocity performance and precision positioning performance, no matter the direction of motion how; The stationarity and the linearity that can both strict guarantee move; To realize precise displacement in the plane, the positioning accuracy of the linear electric motors in the present embodiment is ± 2 μ m, and repetitive positioning accuracy is 1 μ m; Maximal rate is 1m/s, and acceleration is 1m/s ²

In addition, the first grating chi 512 that is installed on first guide rail 511 can be followed the tracks of first the mobile of pedestal 51, and feeds back the position of first pedestal 51, and first anticollision device, collision-prevention device 513 can be realized the Stroke Control to first pedestal 51; The second grating chi 522 that is installed on second guide rail 521 can be followed the tracks of second the mobile of pedestal 52, and feeds back the position of second pedestal 52, and second anticollision device, collision-prevention device 523 can be realized the Stroke Control to second pedestal 52; The support 8 that moves on the vertical direction equally also can be provided with the 3rd grating chi and the 3rd anticollision device, collision-prevention device, to detect and the feedback position of support 8 on bearing 7 and the lifting travel of limit bracket 8.The table stroke of present embodiment (respectively along X axle and Y axle) is 500mm * 400mm, and the support 8 vertically stroke on (Z axle) is 100mm～200mm;

So; During work, travelling table is also adjusted the height of support 8, and the microparticles 9 that make microjet shower nozzle 1 aim in the container 6 spray; After " water tweezer " that microjet shower nozzle 1 produces clamped microparticle 9; Travelling table makes nipped microparticle 9 can move in the microparticle accommodation box once more, accomplishes transporting of a microparticle 9 thus.

Present embodiment utilizes the boundary layer flow bulk properties on microparticle surface to realize a kind of " water tweezer " that can produce clamping action to microparticle 9; The water tweezer is wrapped in inside with microparticle 9, and realization is caught microparticle 9, when the water tweezer moves; Microparticle 9 centers that are hunted down are departed from microjet 14 centers; Around microparticle 9, form front and back pressure reduction, under the effect of pressure reduction, drive microparticle 9 and move, realize transporting and controlling of microparticle 9 along moving direction.The microparticle acquisition equipment of present embodiment just can be realized " water tweezer " effect under common experiment condition; Simple and practical; Be more prone to realize and operation; A kind of novel microparticle mode of operation not only is provided, and the stack shaping that also carries out microparticle for little manufacturing field provides new thinking and method.

Claims (10)

1. microparticle acquisition equipment; It is characterized in that: described microparticle acquisition equipment includes microjet shower nozzle (1), voltage-stablizer (2) and is the hydraulic means (3) that said microjet shower nozzle (1) provides atomizing of liquids; Offer the annular spray chamber (13) that runs through vertically in the said microjet shower nozzle (1); This annular spray chamber (13) internal diameter is complementary with microparticle (9) diameter of desiring to catch; The top of said annular spray chamber (13) is provided with entrance port (131); The bottom of said annular spray chamber (13) is provided with jet (132), and the input of said voltage-stablizer (2) links to each other with the fluid pipeline of said hydraulic means (3), and the entrance port (131) of output of this voltage-stablizer (2) and said microjet shower nozzle (1) links to each other.

2. microparticle acquisition equipment according to claim 1; It is characterized in that: satisfy following relational expression between the diameter of the internal diameter of said annular spray chamber (13) and said microparticle (9): Φ w-10 μ m≤Ψ pi≤Φ w; Wherein, Ψ pi representes the internal diameter of said annular spray chamber (13), and Φ w representes the diameter of said microparticle (9), and the unit of said Ψ pi and Φ w is μ m.

3. microparticle acquisition equipment according to claim 1; It is characterized in that: described microjet shower nozzle (1) includes nozzle housing (11) and sprinkler core (12); Said nozzle housing offers the through hole that runs through vertically in (11); Said sprinkler core (12) includes core print (121) and core body (122); Said core print (121) offsets with the top of said nozzle housing (11) and is fixedly connected, and said core body (122) is inserted in the said through hole, forms described annular spray chamber (13) between the core body (122) of the through-hole wall of said nozzle housing (11) and said sprinkler core (12); And, offer and the corresponding inlet opening in said entrance port (131) (121a) on the core print (121) of said sprinkler core (12).

4. microparticle acquisition equipment according to claim 3 is characterized in that: said sprinkler core (12) is T-shaped along the cross section of central axis, a plurality of through holes of said inlet opening (121a) for circumferentially offering at interval along the core print (121) of said sprinkler core (12).

5. microparticle acquisition equipment according to claim 1; It is characterized in that: said hydraulic means (3) includes plunger displacement pump (31), drives the motor (32) of said plunger displacement pump (31) work and can realize the booster (33) that said atomizing of liquids sucks and discharges; Wherein, Be communicated with through hydraulic circuit (35) between said booster (33) and the plunger displacement pump (31), directional control valve (34) is installed on this hydraulic circuit (35).

6. an application is just like the microparticle conveying equipment of the described microparticle acquisition equipment of arbitrary claim in the claim 1～5, and it is characterized in that: described microparticle conveying equipment includes

Base (4);

Workbench is arranged at that said base (4) is gone up and can does straight line respectively along the length of this base (4) and width and move;

Be contained with the container (6) of microparticle (9), be fixedly set on the said workbench, said container (6) is arranged on the below of said microjet shower nozzle (1);

Bearing (7) is provided with perpendicular to said base (4), is equipped with on the said bearing (7) to do vertically that straight line moves and overhanging support (8), and the overhanging end of said support (8) is fixedly linked with the voltage-stablizer (2) that is arranged on the said microjet shower nozzle (1).

7. microparticle conveying equipment according to claim 6; It is characterized in that: said workbench includes first pedestal (51) and second pedestal (52); Also include first motor and second motor; Said base (4) is provided with first guide rail of arranging along its length (511); Said first pedestal (51) can be done straight line along said first guide rail (511) and move under the driving of said first motor, said first pedestal (51) is provided with second guide rail of arranging along the width of said base (4) (521), and said second pedestal (52) can be done straight line along said second guide rail (521) and move under the driving of said second motor.

8. microparticle conveying equipment according to claim 7; It is characterized in that: the side of said first guide rail (511) is provided with tracking and feeds back the first grating chi (512) of said first pedestal (51) shift position, and the side of said second guide rail (521) is provided with tracking and feeds back the second grating chi (522) of said second pedestal (52) shift position.

9. microparticle conveying equipment according to claim 7; It is characterized in that: also be provided with first anticollision device, collision-prevention device (513) of restriction said first pedestal (51) shift motion on the said base (4), said first pedestal (51) is provided with second anticollision device, collision-prevention device (523) of restriction said second pedestal (52) shift motion.

10. microparticle conveying equipment according to claim 7 is characterized in that: said first motor and second motor are linear electric motors.

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