CN114939531B - Micro-nano particle diameter divider based on inertial impact principle - Google Patents
Micro-nano particle diameter divider based on inertial impact principle Download PDFInfo
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- CN114939531B CN114939531B CN202210480235.XA CN202210480235A CN114939531B CN 114939531 B CN114939531 B CN 114939531B CN 202210480235 A CN202210480235 A CN 202210480235A CN 114939531 B CN114939531 B CN 114939531B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B13/00—Grading or sorting solid materials by dry methods, not otherwise provided for; Sorting articles otherwise than by indirectly controlled devices
- B07B13/04—Grading or sorting solid materials by dry methods, not otherwise provided for; Sorting articles otherwise than by indirectly controlled devices according to size
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B13/00—Grading or sorting solid materials by dry methods, not otherwise provided for; Sorting articles otherwise than by indirectly controlled devices
- B07B13/14—Details or accessories
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B13/00—Grading or sorting solid materials by dry methods, not otherwise provided for; Sorting articles otherwise than by indirectly controlled devices
- B07B13/14—Details or accessories
- B07B13/16—Feed or discharge arrangements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B13/00—Grading or sorting solid materials by dry methods, not otherwise provided for; Sorting articles otherwise than by indirectly controlled devices
- B07B13/14—Details or accessories
- B07B13/18—Control
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
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- Sampling And Sample Adjustment (AREA)
- Separating Particles In Gases By Inertia (AREA)
Abstract
The invention discloses a micro-nano particle diameter divider based on an inertial impact principle. The invention comprises an inlet shell, an impact cavity, a positioning sleeve and an outlet shell; the inlet shell, the impact cavity and the outlet shell are sequentially connected through the locating sleeve; the impact cavity is provided with a plurality of high-speed impact components which are arranged in parallel; each high-speed impact part comprises a high-speed impact part inlet, an impact nozzle connected with the high-speed impact part inlet, a movable impact flat plate positioned right below the impact nozzle and high-speed impact part outlets positioned on two sides of the impact flat plate. According to the invention, through the design of the nozzle-shaped flow channel, an impact flow field is obtained, so that the air flow containing micro-nano particles impacts the flat plate at a high speed, and the deposition of particles with a narrow range of particle diameters on the flat plate is realized; meanwhile, roughness is added on the upper surface of the impact plate to prevent particles from rebounding; a plurality of high-speed impact components are connected in parallel to form a honeycomb shape for increasing flow, so that collection efficiency is improved.
Description
Technical Field
The invention relates to a dry powder particle diameter-dividing instrument, in particular to an instrument capable of classifying submicron or nanometer particles according to particle size under a drying condition.
Background
Nanomaterials are the hot spot of current research, and characteristic analysis of nanoparticles is the key for nanoparticle synthesis, characterization and application. The characteristics of the particles are closely related to the particle size distribution, the application range of the nano particles with narrow particle size distribution is wider, and the product produced by the nano particles has more stable performance, such as capacitance coating, chromatographic packing, liquid crystal screen and the like.
At present, obtaining the monodisperse nano particles with accurate and controllable properties and uniform particle size is still a bottleneck for restricting the upgrade of the manufacturing industry in China. The existing diameter separation technology such as sedimentation method and sieving method is mainly used in a small amount of particle size measurement process, is difficult to realize batch and long-time particle size separation, is commonly used for separating particles in solution, and has less application to dry powder particle separation. Therefore, by utilizing the principle of inertial impact of particles in an airflow field, micro-nano particle separation of particles with different particle diameters is realized according to the motion characteristics of the particles with different particle diameters, nano materials with uniform particle diameters are obtained, good collecting effect is realized, and the method has important significance for obtaining high-quality nano particles.
The principle of the micro-nano particle diameter divider based on the principle of inertial impact is as follows: after the airflow carrying the particle phase is accelerated through the impact nozzle, the original direction of the airflow is changed due to the interception effect of the impact flat plate, so that particles with a certain range of particle diameters cannot move continuously along with the airflow due to larger inertia and finally impact on the impact flat plate to be collected; while particles of other sizes will continue to follow the airflow to leave the plate. Thus, particles within a certain size range are collected.
However, as the sampling time of the particles increases, the particle overload phenomenon occurs on the impact plate, so that the particles which should be collected by the impact plate strike on the previously accumulated particles, a particle rebound phenomenon occurs, and then leave the impact plate to continue to flow with the airflow, eventually resulting in a lower collection efficiency of the particles with the particle size. In addition, the existing particle size grading device model is generally smaller, is only suitable for particle collection under the small flow condition facing particle size distribution measurement, cannot be widely applied to the micro-nano particle size screening field, and greatly limits the product performance of nano materials.
Disclosure of Invention
In view of the above, the invention aims to provide a particle diameter divider which is used in an air flow field and can realize continuous micro-nano particle diameter division based on the principle of inertial impact and reduce the phenomenon of particle overload.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the invention comprises an inlet shell, an impact cavity, a positioning sleeve and an outlet shell; the inlet shell, the impact cavity and the outlet shell are sequentially connected through the locating sleeve;
the impact cavity is provided with a plurality of high-speed impact components which are arranged in parallel; each high-speed impact part comprises a high-speed impact part inlet, an impact nozzle connected with the high-speed impact part inlet, a movable impact flat plate positioned right below the impact nozzle and high-speed impact part outlets positioned on two sides of the impact flat plate.
Preferably, the roughness of the impingement plate is increased to reduce particle rebound.
Preferably, the time for the impact plate to move is a set value.
Preferably, a knob is arranged on the left side of the impact flat plate, and a telescopic bracket is arranged below the impact flat plate. The outside of the impact cavity is provided with a button, and the button controls the expansion and contraction of the bracket through a connecting path.
Preferably, the inlet housing and the outlet housing are each provided with an interface for connecting the pressure reducing valve.
The invention has the beneficial effects that: the impact flow field is obtained through the design of a nozzle-shaped flow channel, so that the air flow containing micro-nano particles impacts the flat plate at a high speed, and the deposition of particles with narrow particle size range on the flat plate is realized; meanwhile, roughness is added on the upper surface of the impact plate to prevent particles from rebounding; a plurality of high-speed impact components are connected in parallel to form a honeycomb shape for increasing flow, so that the collection efficiency is improved; the button outside the device is designed to shorten the length of the bracket for supporting the impact plate, so that the direction of the collecting plate is controlled to change to prevent particles from accumulating, and after the impact plate is put down, the particles are collected by adsorption of adsorption materials into a proper container.
Drawings
FIG. 1 is a perspective view of the present invention;
FIG. 2 is a front view of the present invention;
FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2;
FIG. 4 is a schematic view of a high-speed impact member;
FIG. 5 is a cross-sectional view taken along the direction B-B of FIG. 3;
FIG. 6 is a graph simulating particle collection efficiency for different particle sizes.
The main reference symbols in the drawings indicate:
1. an inlet housing; 2. an impingement cavity; 201. a high-speed impact member; 2011. a high-speed impingement member inlet; 2012. an impingement nozzle; 2013. an impact plate; 2014. a high-speed impact member outlet; 2015. a knob; 2016. a bracket; 2017. the bracket is connected with the shell path; 3. a positioning sleeve; 4. a button; 5. an outlet housing; 6. and a port connected with the pressure reducing valve.
Detailed Description
The following describes specific embodiments of the present invention in detail with reference to the drawings. It should be understood that the detailed description is intended to illustrate and explain the invention, and not to limit the invention.
The invention comprises an inlet housing, an impact cavity, a positioning sleeve, a button, an outlet housing and a pressure reducing valve interface. The inlet housing has a gas inlet with a lower end connected to the impingement chamber. The impact cavity is a core area for particle collection and is provided with a plurality of high-speed impact components which are arranged in parallel to realize particle collection under a large flow rate; the single high-speed impact part consists of an impact nozzle and a movable impact flat plate with high roughness, which is positioned below the nozzle, and a telescopic bracket is connected below the impact flat plate. The button can control the expansion and contraction of the bracket. The outlet housing has a gas outlet connectable to a sampling device. The inlet shell and the outlet shell are uniformly distributed with pressure reducing valve interfaces. The inlet shell, the impact cavity and the outlet shell are sequentially connected through the locating sleeve. The flow of the air flow is accelerated by adopting the flow passage with the contracted and expanded cross section, so that the air flow impacts the wall surface, and the flow separation of particles with different particle diameters is realized; the nozzle arrays are distributed in parallel, so that the airflow rate can be increased; the particle release device is designed, so that continuous work of the particle diameter division process can be realized.
Examples:
referring to fig. 1, 2 and 3, the present embodiment includes an inlet housing 1, an impact chamber 2, a positioning sleeve 3, a button 4, an outlet housing 5, and an interface 6 for connecting a pressure reducing valve. The inlet shell 1, the impact cavity 2 and the outlet shell 5 are sequentially connected through the positioning sleeve 3; the gas inlet of the inlet housing 1 is connected with a gas flowmeter through a gas guide pipe. The impact chamber 2 has a plurality of juxtaposed high-speed impact members 201; wherein the high-speed impact member 201 includes a high-speed impact member inlet 2011, an impact nozzle 2012 connected to the high-speed impact member inlet 2011, an impact plate 2013 positioned immediately below the impact nozzle 2012 at an initial position, and a high-speed impact member outlet 2014. A knob 2015 is provided on the left side of the strike plate 2013, and a telescoping bracket 2016 is provided below the strike plate 2013. The button 4 is located outside the impulse chamber 2 and controls the expansion and contraction of the bracket 2016 via the connection path 2017. The outlet housing 5 is connected to the impingement chamber 2, and the gas outlet of the outlet housing 5 is connectable to a sampling device. The inlet housing and the outlet housing are both provided with an interface 6 for connecting the pressure reducing valve.
According to the design, the sample fluid with particles passes through the static eliminating device to remove the charges of the particles to be measured, then flows through the flowmeter through the conduit to determine the flow rate of the sample fluid flowing into the micro-nano particle diameter divider, then flows through the gas inlet of the inlet housing 1, the high-speed impact part inlet 2011, the impact nozzle 2012, the high-speed impact part outlet 2014 and finally flows out of the gas outlet of the outlet housing 5. Particles within a range of high velocity impact member collection sizes are collected by the impact plate 2013; while the flow of the sample fluid turns as it passes over the upper region of the impingement plate 2013 and eventually exits through the high velocity impingement member outlet 2014. The inlet housing 1 and the outlet housing 5 are each provided with a port 6 for connecting a pressure reducing valve to control the pressure upstream and downstream of the high-speed impact member 201, and the inlet housing 1 and the outlet housing 5 are constructed identically.
However, in practical situations, as the working time of the micro-nano particle diameter divider increases, particles tend to accumulate on the surface of the impact plate 2013, so that particles which should be collected on the impact plate 2013 later impact the particles which have remained on the impact plate 2013 before, and the particles bounce off; and then the flow of the air flow is continued to follow, so that the collection efficiency of the micro-nano particle diameter divider is affected. In this embodiment, as shown in fig. 4, the probability of occurrence of this phenomenon can be reduced by increasing the roughness of the strike plate 2013. In addition, a prescribed time may be set, and the length of the bracket 2016 below the striking plate 2013 may be changed by the control button 4; the knob 2015 is then rotated such that the strike plate 2013 is oriented from parallel to downward sloping. At this time, the collected particles are adsorbed into the sampling device by connecting an adsorption material at the gas outlet of the outlet housing 5. This has the advantage that particles of a specific size can be obtained without removing the impingement plate. In addition, a plurality of high-speed impact members 201 are juxtaposed in the cavity 2 as shown in fig. 5 to be suitable for particle collection under a high flow rate condition, and the flow rate can be easily adjusted as required. It should be noted that after the micro-nano particle diameter divider is used for a period of time, clean air should be used to flush the device at a fixed air flow speed, so that particles staying on the wall surface flow out, and the purposes of cleaning the instrument and reducing errors are achieved.
For the present invention, the individual high-speed impact members 201 in the impact chamber 2 were taken out for simulation calculation, and the relationship between the particle collection efficiency and the particle diameter was obtained as shown in fig. 6. The collection efficiency of the high-speed impact part reaches more than 60% for particles with particle sizes larger than 2.48 mu m, and the collection efficiency reaches 100% for particles with particle sizes larger than 3.8 mu m. The volume flow of the gas inlet is 1X 10 -5 m 3 And/s, the pressure of the gas inlet is 98480Pa, and the pressure of the gas outlet is 98410Pa. It should be noted that particle separation in other particle size ranges may also be achieved with different high velocity impact member geometries and different inlet-outlet pressure differentials, just to name one.
The foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and any simple modification, variation and equivalent structural changes made to the above embodiment according to the present invention are still within the scope of the technical solution of the present invention.
Claims (4)
1. The utility model provides a little nanometer particle divides footpath appearance based on inertia impact principle which characterized in that: comprises an inlet shell, an impact cavity, a positioning sleeve and an outlet shell; the inlet shell, the impact cavity and the outlet shell are sequentially connected through the locating sleeve;
the impact cavity is provided with a plurality of high-speed impact components which are arranged in parallel; each high-speed impact part comprises a high-speed impact part inlet, an impact nozzle connected with the high-speed impact part inlet, a movable impact flat plate positioned right below the impact nozzle and high-speed impact part outlets positioned on two sides of the impact flat plate; the flow of the air flow is accelerated by adopting the flow passage with the contracted and expanded cross section, so that the air flow impacts the wall surface, and the flow separation of particles with different particle diameters is realized;
a knob is arranged on the left side of the impact flat plate, and a telescopic bracket is arranged below the impact flat plate; a button is arranged outside the impact cavity and controls the expansion and contraction of the bracket through a connecting path; controlling the direction of the impact plate to change so as to prevent particles from accumulating; after the impingement plate is lowered, the particles are collected by adsorption by the adsorbent material into a suitable vessel.
2. The micro-nano particle diameter divider based on the principle of inertial impact according to claim 1, wherein: increasing the roughness of the strike plate reduces particle bounce.
3. The micro-nano particle diameter divider based on the principle of inertial impact according to claim 1, wherein: the time of the impact plate movement is set as a set value.
4. A micro-nano particle sizer based on the principle of inertial impaction according to any of claims 1 to 3, wherein: the inlet shell and the outlet shell are respectively provided with an interface for connecting the pressure reducing valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210480235.XA CN114939531B (en) | 2022-05-05 | 2022-05-05 | Micro-nano particle diameter divider based on inertial impact principle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210480235.XA CN114939531B (en) | 2022-05-05 | 2022-05-05 | Micro-nano particle diameter divider based on inertial impact principle |
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| Publication Number | Publication Date |
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| CN114939531A CN114939531A (en) | 2022-08-26 |
| CN114939531B true CN114939531B (en) | 2023-07-21 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3433422A (en) * | 1965-07-14 | 1969-03-18 | Entoleter | Method and apparatus for rotary processing and classification |
| EP1616624B1 (en) * | 2004-07-13 | 2009-12-16 | Ricoh Company, Ltd. | Milling and classifying apparatus, pneumatic impact pulverizer, air classifier and method for producing toner |
| CN1695771A (en) * | 2005-03-25 | 2005-11-16 | 清华大学 | Sampler for aerosol granules |
| CN101692021B (en) * | 2009-10-21 | 2012-10-31 | 武汉市天虹仪表有限责任公司 | Single-channel multi-functional medium flow atmospheric particulate cascade sampling cutter |
| CN203101128U (en) * | 2012-11-08 | 2013-07-31 | 上海市环境监测中心 | Particulate matter sampling device |
| TWI638683B (en) * | 2017-08-15 | 2018-10-21 | 國立交通大學 | Inertial impactor with a wetted impaction plate to prevent particle loading effect |
| DE102019121105A1 (en) * | 2019-08-05 | 2021-02-11 | CleanControlling GmbH | Transportable particle collection device |
| CN212442084U (en) * | 2020-05-25 | 2021-02-02 | 张掖玉宇先进材料有限公司 | Device for sorting powder material by utilizing kinetic energy |
| CN114260187B (en) * | 2021-12-21 | 2024-01-30 | 优缇智能科技（苏州）有限公司 | Aerosol sorting and generating device |
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| CN114939531A (en) | 2022-08-26 |
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