CN208449633U - The device of the lossless depolymerization of free shear turbulence array and fine grading LED fluorescent powder - Google Patents

Abstract

The utility model discloses a kind of lossless depolymerization of free shear turbulence array and the devices of fine grading LED fluorescent powder.The utility model constructs space macroturbulence whirlpool by distributed type high speed Jet stream array come depolymerization, suspension fluorescent powder grain, fine grading is carried out to it according to the flow modulation near fluorescent powder grain air-flow followability combination grading wheel simultaneously, is collected, the final multistage screening realized to fluorescent powder grain.The utility model is with strong applicability, and structure is realized and flows easy to control, the lossless depolymerization of fluorescent grain powder diameter and fine grading may be implemented, fluorescent powder medium particle diameter is in 3-30um range-controllable, and dispersion is small, and light-emitting phosphor is high-efficient.

Description

The device of the lossless depolymerization of free shear turbulence array and fine grading LED fluorescent powder

Technical field

The utility model belongs to aerosol technology, granule technology and field of material technology, is related to a kind of utilize and freely shears The device of the lossless depolymerization of turbulent flow array and fine grading fluorescent powder.

Background technique

Micron and nanoparticle agglomerates are the universal phenomenon of nature and are widely present in practical implementation, cluster of grains It is poly- to be utilized, such as nano material preparation, ultrasonic reunion dedusting, it is also possible to need what is solved to ask as engineer application Topic, such as the depolymerization of nanometer aerosol drug dispersion, fluorescent powder.Recently, with the development of green energy resource technology, LED technology with Its huge advantage in terms of energy consumption, light-source brightness is gradually instead of traditional lamp source.And the performance of LED light largely depends on In the intact degree of the micromorphology of fluorescent powder, particle diameter distribution and the depolymerization disperse the case where, fluorescent powder grain surface topography is got over Completely, depolymerization is more abundant, is classified more accurate particle diameter distribution more concentrates, then the performance of LED light is better.Therefore, it can be said that LED light During the manufacturing, how abundant depolymerization and fine grading fluorescent powder, while protection fluorescent powder grain surface is micro- to greatest extent The core technology that pattern is LED is seen, it is most important to manufactured LED overall performance and energy-saving horizontal.

Existing powder body material depolymerization and classification technique, such as wet ball grinding, high pressure draught crush, and mainly use material phase Mutually collision is crushed, and is worn with this to reduce, and depolymerization efficiency is improved, and then has grading wheel, centrifugal whirlwind point for classification From device etc., these technical equipments are widely applied early in the large-scale engineering preparation of powder granule material.Nevertheless, existing skill Art mainly carries out depolymerization using the mutual collision of powder material, it is clear that this does not meet protection fluorescent powder grain surface microscopic topographic Requirement, meanwhile, these existing equipments are substantially that stainless steel and other metal materials are made, surface be not directed to the needs of fluorescent powder into Row processing inevitably results in the pollution to fluorescent powder grain surface in depolymerization and classification；Secondly, current single rely on is divided Step cone carry out particle classifying technology relative fluorescence powder fine grading require or it is relatively rough, i.e., grading wheel is resulting glimmering Often dispersion is excessive for light powder particle diameter distribution, will lead to the reduction of LED light efficiency；Finally, due to the separative efficiency of grading wheel is high, The features such as at low cost, is well suited for using when fluorescent powder classification, but on condition that need to handle the surface of grading wheel, and as point Step cone surface geometry complicated in this way, and be the difficult point in material coating preparation.

In view of the above-mentioned problems, utilizing the lossless depolymerization of free shear turbulence array and fine grading the utility model proposes a kind of The device of fluorescent powder, devises novel no ball milling air-flow fine grading technology and solid space distribution turbulent flow vortex structures occur Device solves the destruction and pollution problem of conventional wet ball milling and high pressure draught crushing to fluorescent powder grain surface, realizes The accuracy controlling of fluorescent powder particle diameter distribution.

Summary of the invention

The purpose of this utility model is for the fluorescent powders depolymerization such as conventional wet ball milling and high pressure draught crushing and classification skill Art is easy to destroy and pollute the deficiency on fluorescent powder grain surface, provide it is a kind of using the lossless depolymerization of free shear turbulence array and The device of fine grading fluorescent powder grain.The device constructs space macroturbulence whirlpool by distributed type high speed Jet stream array to solve Poly-, suspension fluorescent powder grain, at the same according to the flow modulation near fluorescent powder grain air-flow followability combination grading wheel to its into Row fine grading is collected, the final multistage screening realized to fluorescent powder grain.

For the above-mentioned purpose of utility model of realization, the technical solution of the utility model is

The utility model includes that nozzle header and flow modulation nozzle header occur for grader, particle collector, turbulence vortex, One group of turbulence vortex is set in grader inner cavity lower part, nozzle occurs, nozzle occurs for the turbulence vortex of multiple non-radial space uniform distributions With the contact surface center of inner cavity cylinder wall surface in a horizontal plane, and turbulence vortex occur the vertical component of jet expansion to On.

One group of flow modulation nozzle, multiple non-radial spaces are set close to grading wheel near zone on grader inner cavity top Equally distributed flow modulation nozzle is contrary with the turbulence vortex generation tangential direction horizontal component of nozzle；Flow modulation nozzle Flow to centerline in same level or the vertical component in flow modulation jet expansion direction is downward.

The multiple turbulence vortex occurs nozzle and is connected by an annular turbulence vortex generation nozzle header, multiple streams Dynamic modulation nozzle header is connected by an annularly flow modulation nozzle header；Nozzle header and flowing occur for the turbulence vortex Modulation nozzle header has air inlet.

Grader intracavity bottom is provided with particle collector.

Furtherly, a certain imaginary circles cylinder S2, and the imaginary circles cylinder S2 and grader inner cavity cylindrical wall are equipped with Face S1 coaxial arrangement, diameter are less than the diameter of grader inner cavity cylinder wall surface S1；Then the turbulence vortex occurs in the flow direction of nozzle Heart line and imaginary circles cylinder S2 are tangent.

Furtherly, if the diameter of grader inner cavity cylinder wall surface S1 is D_S1, then the diameter of the imaginary circles cylinder S2 For 0.6 D_S1-0.9 D_S1, it is 2mm-20mm that nozzle outlet diameter D1, which occurs, for turbulence vortex, and flow modulation nozzle outlet diameter D2 is 0.2D1-1.2D1。

Furtherly, nozzle, which occurs, for the turbulence vortex 2-10.

Furtherly, the flow modulation nozzle has 2-20.

Furtherly, it is acute angle that nozzle centerline and the angle of horizontal plane, which occur, for the turbulence vortex.

Furtherly, the angle of the flow modulation nozzle centerline and horizontal plane is acute angle.

Furtherly, the grader inner cavity wall surface and classification wheel surface have ceramic coating, which utilizes Differential arc oxidization technique generates.

Furtherly, the ceramic species be aluminium oxide, magnesia, zirconium oxide or titanium oxide, 0.1 μm -20 μm of thickness.

The utility model compared with prior art, has the beneficial effect that

1, destruction and pollution problem to fluorescent powder grain surface, benefit are crushed for conventional wet ball milling and high pressure draught Carry out pure gas dynamic shear with upward macroturbulence vortex pair fluorescent powder grain come lossless depolymerization and suspension, it can be to greatest extent Fluorescent powder grain surface is protected not to be damaged in ground.

2, nozzle diameter occurs using free shear turbulence array whirlpool, the control of circumferentially distributed quantity and inlet pressure can be with It is tentatively classified using the centrifugal movement in the free shear turbulence array whirlpool different-grain diameter big to inertia difference, while can be by The fluorescent powder grain particle size range of this initial setting sorting.

3, grading wheel can effectively be neutralized using the control of flow modulation nozzle diameter, circumferentially distributed quantity and inlet pressure Neighbouring turbulence vortex is reduced caused by disorder turbulent flow with the air-flow of this uniform stable grading wheel entrance area to big partial size The mistake screening of grain, gives full play to the effect of grading wheel, improves the grain sorting precision of grader.

4, the present apparatus is with strong applicability, and structure is realized and flows easy to control, and it is lossless that fluorescent grain powder diameter may be implemented Depolymerization and fine grading, fluorescent powder medium particle diameter is in 3-30um range-controllable, and dispersion is small (less than 0.7), light-emitting phosphor It is high-efficient.

Detailed description of the invention

Fig. 1 is the overall schematic of turbulent flow depolymerization and fine grading fluorescent powder device；

Fig. 2 is the diagrammatic cross-section of turbulent flow depolymerization and fine grading fluorescent powder device；

Fig. 3 is Fig. 2 cross section A-A schematic diagram；

Fig. 4 is Fig. 2 section B-B schematic diagram；

Fig. 5 is the schematic illustration using the lossless depolymerization of free shear turbulence array and fine grading fluorescent powder；

Fig. 6 is the inner cavity streamline distribution for not adding flow modulation nozzle；

Fig. 7 is the inner cavity streamline distribution with flow modulation nozzle；

Fig. 8 is the exit cross-section velocity vector field for not adding flow modulation nozzle；

Fig. 9 is the exit cross-section velocity vector field with flow modulation nozzle.

1 grader shell, 2 flow modulation nozzle header entrances, 3 fluorescent powder grain feed inlets, 4 turbulence vortex are sprayed Nozzle header, 7 flow modulation nozzle headers occur for mouth header import, 5 particle collectors, 6 turbulence vortex, and 8 graders export, and 9 Nozzle, 10 flow modulation nozzles, 11 motors, 12 grading wheels, 13 grader inner cavity wall surface S1,14 concentric circles occur for turbulence vortex Cylinder S2.

Specific embodiment

The utility model is described in further detail with example with reference to the accompanying drawing.

As shown, the whole implementation scheme of the utility model are as follows: be equipped in the lower part of grader inner cavity multiple non-radial Nozzle 9 occurs for the turbulence vortex of space uniform distribution, and the contact surface center of nozzle 9 and inner cavity cylinder wall surface S1 13 occurs for turbulence vortex With in a horizontal plane, nozzle flows to center line and the circle smaller and concentric than grader inner cavity 13 diameters of cylinder wall surface Cylinder S2 14 is tangent, and it is upward that 9 exit normal durection component of nozzle occurs for turbulence vortex.It is former according to delivery rate and fluorescent powder grain The difference of beginning partial size, it is that turbulence vortex generation nozzle 9 provides that nozzle header 6, which occurs, by the turbulence vortex in 1 circumferential direction of grader shell The compressed gas of relevant pressure, compressed gas occur nozzle header import 4 by turbulence vortex and enter header；In the inlet pressure of nozzle Reach preset value and carries out fluorescent powder grain feed again after balancing；The turbulence vortex of inner cavity lower part occurs nozzle and presses in larger pressure P1 Under the driving of contracting gas, in the circumferential multiple positions of concentric circles cylinder 14 along its tangential jet stream for generating high intensity, thus in inner cavity It is formed in and (projects from top to bottom) and hanging down in floor projection for unidirectional movement (as shown in Figure 5) " counterclockwise " along the horizontal plane The large-scale dimension turbulence vortex that the upward turbulence vortex of histogram integrally moves upwards, it is on the one hand flat using free shear turbulence array eddy water Rotation on face can be according to difference (such as different quality particle under the action of turbulence vortex of different-grain diameter particle inertia and followability The centrifugal force being subject to is different), on the other hand fluorescent powder grain progress fluid shearing depolymerization and preliminary classification then can use certainly It is moved upwards by the entirety in shear turbulence array whirlpool, the fluorescent powder grain for the freely falling body for launching fluorescent powder grain feed inlet 3 The upward drag force of air-flow is obtained, to overcome levitation.The intensity that reasonably adjustment turbulence vortex moves upwards can allow pre- The fluorescent powder grain gravity of sorting size is greater than drag force and continues the particle that freely falling body enters collector 5 and completes this level-one and divide Choosing.

It is equipped with the flow modulation nozzle 10 opposite with lower nozzle tangential direction horizontal component in 12 near zone of grading wheel, Flow modulation nozzle 10 be also it is non-radial be uniformly distributed along lumen centers space of lines, as shown in Figure 4；Flow modulation nozzle is by one Annular header 7 is connected, and header is equipped with compressed gas general import 2, is connected by the import with compressed gas source.Flow modulation nozzle 10 in smaller pressure P2(P2 < P1) driving under, generate in floor projection (clockwise, as shown in Figure 5) opposite with turbulence vortex, vertical The histogram gas motion that whole downward or speed is 0 upwards, the reversed turbulence vortex that flow modulation generates can be substantially The circumferential direction and vertical movement of lower part forward direction turbulence vortex are neutralized, so that the flowing velocity of 12 entrance of grading wheel is smaller, flow field is more steady It is fixed uniformly, avoid overgenerous turbulence pulsation that large-size particles is caused also to enter grading wheel and be sorted, into next fraction Grade machine carries out reliable fine grading to fluorescent powder grain for grading wheel 12 and creates conditions.Fig. 6-Fig. 9 gives grader inner cavity The numerical simulation result in whole flow field under the conditions of different flow modulations is adjusted by the comparison of Fig. 6 and Fig. 7 it is found that flowing is not configured When nozzle processed, grader inner cavity still can have very strong turbulent flow vortex structure, this is to grading wheel up to the cross section of near exit Normal work be it is unfavorable, Fig. 8 and Fig. 9 on exit cross-section velocity vector distribution clearly shows configuration stream After dynamic modulation nozzle, the flowing near grading wheel is effectively modulated, and flow velocity is smaller, and flow field is more uniform, to give full play to Solid foundation has been established in the effect of grading wheel.It is 2mm-20mm that nozzle outlet diameter D1, which occurs, for the turbulence vortex, under The inlet pressure P1 that portion's annular header provides is 0.1 ~ 1MPa, and the flow modulation nozzle outlet diameter D2 is 0.2D1- 1.2D1, inlet pressure P2 are 0.1P1-0.6P1.

Grading wheel 12 is located at grader inner cavity top, is connected with single-stage grader outlet 8, grading wheel 12 is driven by motor 11 It is dynamic, it is additionally provided with fluorescent powder grain feed inlet 3 on grader inner cavity top, bottom is equipped with fluorescent powder grain collector 5；In grader Cavity wall face 13,12 surface of grading wheel are all coated with special ceramics coating using differential arc oxidization technique, to reduce particle-wall collisions It deposits and adsorbs with particle, so that fluorescent powder grain surface be protected not to be contaminated.

9 outlet diameter of nozzle can occur by adjusting turbulence vortex and inlet pressure P1, flow modulation nozzle 10 export directly Nozzle 9 occurs for diameter and inlet pressure P2, turbulence vortex and 9 and of nozzle occurs for the circumferentially distributed quantity of flow modulation nozzle 10, turbulence vortex The space angle of flow modulation nozzle 10 adapts under different delivery rates, different materials, different-grain diameter and density fluorescent powder The fine grading of grain.

The utility model by the tight fit of above-mentioned key link, using free shear turbulence array occur turbulence vortex and Flow modulation realizes lossless depolymerization and the fine grading of fluorescent powder grain.

Claims (7)

1. the device of the lossless depolymerization of free shear turbulence array and fine grading LED fluorescent powder, including grader, powder collection Nozzle header and flow modulation nozzle header occur for device, turbulence vortex, it is characterised in that:

One group of turbulence vortex is set in grader inner cavity lower part, nozzle occurs, the turbulence vortex of multiple non-radial space uniform distributions occurs The contact surface center of nozzle and inner cavity cylinder wall surface is in a horizontal plane, and the vertical component of jet expansion occurs for turbulence vortex Upwards；

One group of flow modulation nozzle, multiple non-radial space uniforms are set close to grading wheel near zone on grader inner cavity top The flow modulation nozzle of distribution is contrary with the turbulence vortex generation tangential direction horizontal component of nozzle；The stream of flow modulation nozzle To centerline in same level or the vertical component in flow modulation jet expansion direction is downward；

The multiple turbulence vortex occurs nozzle and is connected by an annular turbulence vortex generation nozzle header, multiple flowing tune Nozzle header processed is connected by an annularly flow modulation nozzle header；Nozzle header and flow modulation occur for the turbulence vortex Nozzle header has air inlet；

Grader intracavity bottom is provided with particle collector.

2. the device of the lossless depolymerization of free shear turbulence array according to claim 1 and fine grading LED fluorescent powder, Be characterized in that: nozzle, which occurs, for the turbulence vortex 2-10.

3. the device of the lossless depolymerization of free shear turbulence array according to claim 1 and fine grading LED fluorescent powder, Be characterized in that: the flow modulation nozzle has 2-20.

4. the device of the lossless depolymerization of free shear turbulence array according to claim 1 and fine grading LED fluorescent powder, Be characterized in that: it is acute angle that nozzle centerline and the angle of horizontal plane, which occur, for the turbulence vortex.

5. the device of the lossless depolymerization of free shear turbulence array according to claim 1 and fine grading LED fluorescent powder, Be characterized in that: the angle of the flow modulation nozzle centerline and horizontal plane is acute angle.

6. the device of the lossless depolymerization of free shear turbulence array according to claim 1 and fine grading LED fluorescent powder, Be characterized in that: for the grader inner cavity wall surface and classification wheel surface with ceramic coating, which utilizes differential arc oxidation Technology generates.

7. the device of the lossless depolymerization of free shear turbulence array according to claim 6 and fine grading LED fluorescent powder, Be characterized in that: the ceramic species in the ceramic coating are aluminium oxide, magnesia, zirconium oxide or titanium oxide, 0.1 μm of thickness- 20μm。