CN107789892B - Control structure for centrifugal filtration and collection of micron and submicron particles - Google Patents
Control structure for centrifugal filtration and collection of micron and submicron particles Download PDFInfo
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- CN107789892B CN107789892B CN201610797678.6A CN201610797678A CN107789892B CN 107789892 B CN107789892 B CN 107789892B CN 201610797678 A CN201610797678 A CN 201610797678A CN 107789892 B CN107789892 B CN 107789892B
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- membrane
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- centrifugal
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- 238000001914 filtration Methods 0.000 title claims abstract description 76
- 239000002245 particle Substances 0.000 title claims abstract description 40
- 239000012528 membrane Substances 0.000 claims abstract description 133
- 239000007788 liquid Substances 0.000 claims abstract description 56
- 238000000926 separation method Methods 0.000 claims abstract description 31
- 239000011148 porous material Substances 0.000 claims abstract description 26
- 238000005086 pumping Methods 0.000 claims abstract description 4
- 238000007599 discharging Methods 0.000 claims abstract 2
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 9
- 239000012982 microporous membrane Substances 0.000 claims description 7
- 239000004677 Nylon Substances 0.000 claims description 6
- 239000004642 Polyimide Substances 0.000 claims description 6
- 229920001778 nylon Polymers 0.000 claims description 6
- -1 polyethylene terephthalate Polymers 0.000 claims description 6
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 6
- 229920001721 polyimide Polymers 0.000 claims description 6
- 239000004417 polycarbonate Substances 0.000 claims description 4
- 229920000515 polycarbonate Polymers 0.000 claims description 4
- 239000002861 polymer material Substances 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- 229920004933 Terylene® Polymers 0.000 claims description 3
- 238000003486 chemical etching Methods 0.000 claims description 3
- 239000000835 fiber Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 239000008187 granular material Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 3
- 238000010924 continuous production Methods 0.000 abstract 1
- 239000010408 film Substances 0.000 description 14
- 150000002500 ions Chemical class 0.000 description 14
- 239000002585 base Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 239000002033 PVDF binder Substances 0.000 description 2
- 239000004695 Polyether sulfone Substances 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- 206010070834 Sensitisation Diseases 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- 230000002209 hydrophobic effect Effects 0.000 description 2
- 230000001678 irradiating effect Effects 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 229920006393 polyether sulfone Polymers 0.000 description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 2
- 230000008313 sensitization Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 229920002301 cellulose acetate Polymers 0.000 description 1
- 238000005119 centrifugation Methods 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000010884 ion-beam technique Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
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- 238000000614 phase inversion technique Methods 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D36/00—Filter circuits or combinations of filters with other separating devices
- B01D36/04—Combinations of filters with settling tanks
- B01D36/045—Combination of filters with centrifugal separation devices
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention discloses a control structure for centrifugal filtration and collection of micron and submicron particles, which comprises a centrifugal barrel body, wherein a cylindrical liquid outlet area for discharging filtered liquid is arranged in the center of the centrifugal barrel body, a layer of filtering membrane for filtering the liquid is wrapped around the cylindrical liquid outlet area, and a separation membrane which is divided into a first collection area and a second collection area is arranged between the filtering membrane and the inner wall of the centrifugal barrel body; a liquid pumping port for supplying liquid to be filtered to a collecting area is arranged between the filtering membrane and the separation membrane; the pore diameter of the filtering membrane is smaller than that of the separating membrane; under the action of centrifugal force, particles with larger pore diameters than the separation membrane are trapped in a first collecting area between the separation membrane and the filtering membrane, and particles with smaller pore diameters than the separation membrane are collected in a second collecting area between the inner wall of the centrifugal barrel and the separation membrane; the filtering and collecting device realizes industrialized continuous production, greatly improves filtering and collecting efficiency, and can realize gradient type filtering and collecting effects according to the size difference of the filtered particles.
Description
[ Field of technology ]
The invention relates to a filtering and collecting technology, in particular to a control structure for centrifugal filtering and collecting of micron and submicron particles.
[ Background Art ]
Conventional filtration or collection methods for separating solids from liquids generally employ passing a mixture of solids and liquids through a tubular membrane or filter. For example, separation processes of filters use high fluid pressures to facilitate liquid flow through the filter to separate the liquid from contaminants. High pressure pumps are typically used to generate high fluid pressures. These high pressure pumps consume a significant amount of energy in creating a suitable filtration pressure, particularly as the amount of particulate matter blocking the pores increases. Thus, there is a need for a more efficient fluid filtration device.
Meanwhile, the filtering membrane currently used is a microporous membrane made of porous materials such as a polyether sulfone membrane (PES), a NYLON membrane (NYLON), a mixed cellulose Membrane (MCE), a cellulose acetate membrane (CA), a polypropylene membrane (PP), a hydrophilic/hydrophobic polytetrafluoroethylene membrane (PTFE), a hydrophilic/hydrophobic polyvinylidene fluoride membrane (PVDF), a glass fiber membrane (GF) and the like.
However, the processing and manufacturing mode adopted by the diaphragm is a stretching method, a phase inversion method or a non-woven processing mode, so that the formed holes are not straight holes, the pore size is uneven, and the control is difficult; the pore size is the average pore size and not all are the smallest pore sizes.
Therefore, in filtration, particles are adsorbed in the pores in the membrane due to defects of pore diameter and pore type structure, resulting in clogging, continuous operation cannot be achieved, and the filter membrane needs to be replaced frequently to maintain filtration efficiency, and filtration efficiency is slow.
When a certain component substance in the liquid needs to be collected, as the pore diameter of the porous membrane is uneven, and various pores with different size structures are filled in the porous membrane, when the filtered liquid passes through the membrane, particles in the liquid can be adsorbed in the pores in the membrane, so that the collection efficiency is greatly reduced, and as the liquid is continuously filtered, the particles adsorbed on the membrane can cause the blockage of the membrane, the liquid cannot smoothly pass through the filter membrane, and the liquid and the collected particles are mixed together, so that continuous collection is difficult to realize. And the pore size of the filter membrane is uneven, so that gradient collection of different particles cannot be realized.
[ Invention ]
In order to solve the technical difficulties, the invention provides a method for realizing filtration and collection of filtered liquid simultaneously by means of centrifugation and double filtration membranes, which has higher collection and filtration efficiency and can realize the control structure of centrifugal filtration and collection of micron and submicron particles with gradient continuous separation and collection effects.
The technical scheme adopted by the invention is as follows:
The centrifugal filtering and collecting control structure for micron and submicron level grains includes one centrifugal barrel driven by power, one cylindrical liquid outlet area to exhaust the filtered liquid, one filtering film to filter the liquid and one separating film to separate the space between the filtering film and the inner wall of the barrel into two independent collecting areas; a liquid pumping port for supplying liquid to be filtered to the collecting zone is arranged on the centrifugal barrel body at the bottom of the collecting zone corresponding to the filtering membrane and the separating membrane; the pore diameter of the filtering membrane is smaller than that of the separating membrane; all particles entering the collecting area from the liquid inlet of the pump are blocked between the separating membrane and the filtering membrane, the aperture of the separating membrane is larger than that of the filtering membrane, the filtered liquid with different particle sizes is contained in the centrifugal barrel, and the particles with larger aperture than the separating membrane are trapped in the collecting area between the separating membrane and the filtering membrane under the action of centrifugal force, and the particles with smaller aperture than the separating membrane are collected in the collecting area between the inner wall of the centrifugal barrel and the separating membrane.
Preferably, the collecting area and the radial direction of the collecting area are further provided with a partition plate for dividing each collecting area into a plurality of independent units.
Preferably, the pore size of the filter membrane is selected in accordance with the size of the particles contained in the liquid to be filtered.
Preferably, the liquid outlet area obtains clear liquid when the pore size of the filtering membrane is smaller than the diameter of the smallest particles in the filtered liquid.
Preferably, the filtering membrane and the separating membrane are both straight-hole heavy ion microporous membranes, and the straight-hole heavy ion microporous membranes are microporous membranes with straight holes, which are formed by irradiating high polymer materials through a heavy ion accelerator and then processing the high polymer materials through an acid-base chemical etching mode.
Preferably, the straight-hole type heavy ion microporous membrane is made of one of polyethylene terephthalate (PET), polycarbonate (PC) or Polyimide (PI) films.
Preferably, the outer layers of the filtering membrane and the separating membrane are provided with chemical fiber woven meshes which are formed by silk screen machining of nylon mesh, nylon mesh or terylene mesh materials.
The beneficial effects of the invention are as follows:
due to the adoption of the double-filtering structure design, when the liquid to be filtered passes through the first layer of filtering membrane with small aperture, all particles with larger aperture are filtered out, and the filtered liquid is obtained in the liquid outlet area; meanwhile, due to the pressure difference formed between the centrifugal force and the double-layer membrane, liquid can reach a collecting second area through the separation membrane, the aperture of the separation membrane is larger than that of the filtering membrane, particles smaller than that of the separation membrane reach the collecting second area through the straight-hole separation membrane, and particles larger than that of the separation membrane are trapped in the collecting first area, so that the gradient collecting effect is realized.
Because the filtering membrane and the separation membrane are both straight-hole heavy ion microporous membranes, the aperture of the straight-hole heavy ion microporous membranes is uniform and controllable, and particles or microorganisms larger than the aperture can be absolutely trapped; and when in use, the filtering membrane and the separating membrane are used for filtering and have centrifugal force, and the filtered particles can be thrown off the surface of the membrane under the action of the centrifugal force, so that the blocking of holes can not be caused.
[ Description of the drawings ]
FIG. 1 is a schematic cross-sectional view of a centrifugal tub according to the present invention;
FIG. 2 is a schematic diagram of the working principle of a part of the enlarged structure of the tub body of the present invention;
FIG. 3 is a schematic view of an enlarged cross-sectional structure of the tub of the present invention;
FIG. 4 is an enlarged schematic view of the structure of the filtering membrane and the separation membrane of the present invention;
FIG. 5 is a photograph of a section of an electron microscope of the filtering membrane and the separation membrane of the present invention.
[ Detailed description ] of the invention
The centrifugal filtering and collecting control structure for micron and submicron level grains includes one centrifugal barrel 1 driven by power, one cylindrical liquid outlet area 2 to exhaust the filtered liquid, one filtering film 3 around the cylindrical liquid outlet area 2 to filter the liquid, and one separating film 6 to separate the space between the filtering film 3 and the inner wall of the barrel 1 into two independent collecting areas; a liquid pumping port (not shown) for supplying liquid to be filtered to the first collecting area 4 is arranged on the centrifugal barrel body 1 at the bottom of the first collecting area 4 corresponding to the position between the filtering membrane 3 and the separating membrane 6; wherein the pore diameter of the filtering membrane 3 is smaller than the pore diameter of the separating membrane 6, and the pore diameter of the filtering membrane is selected according to the size of particles contained in the filtered liquid; all particles entering the first collecting area 4 from a liquid inlet of the pump are blocked between the separation membrane 6 and the filtering membrane 3, the aperture of the separation membrane 6 is larger than that of the filtering membrane 3, the centrifugal barrel body 1 contains filtered liquid with different particle sizes, the particles with larger aperture than the separation membrane are trapped in the first collecting area 4 between the separation membrane 6 and the filtering membrane 3 under the action of centrifugal force, the particles with smaller aperture than the separation membrane 6 are collected in the second collecting area 5 between the inner wall of the centrifugal barrel 1 and the separation membrane 6, and when the aperture of the filtering membrane 3 is smaller than that of the smallest particles in the filtered liquid, the liquid outlet area 2 directly obtains clear liquid; a partition 7 dividing each collecting zone into a plurality of independent units is further provided in the radial direction of the collecting zone 4 and the collecting zone 5.
As shown in fig. 4 and 5, the filtering membrane 3 and the separating membrane 6 are both straight-hole heavy ion microporous membranes, and the pore diameters of the straight-hole heavy ion microporous membranes which are uniformly communicated downwards in fig. 4 are straight micropores 10; the straight hole type heavy ion microporous membrane is a microporous membrane with straight holes, which is formed by processing a high polymer material through irradiation of a heavy ion accelerator and an acid-base chemical etching mode, and is made of one of polyethylene terephthalate (PET), polycarbonate (PC) or Polyimide (PI); and the outer layers of the filtering membrane 3 and the separating membrane 6 are also provided with chemical fiber woven meshes which are formed by silk screen mechanical processing of nylon mesh, nylon mesh or terylene mesh materials.
When in use, the processing method adopted by the straight-hole heavy ion microporous membrane specifically corresponding to the filtering membrane 3 and the separating membrane 6 comprises the following steps:
(1) Imaging a base film: selecting one of polyethylene terephthalate film, polycarbonate and polyimide with thickness of 6-50 μm as base film;
(2) And (3) irradiation: the method comprises the steps of selecting heavy ion beam with energy of 1MeV-500MeV and flow intensity of 0.1 nanoampere-10 microamperes to irradiate a base film from one surface, wherein the irradiation time is 0.1 seconds to nine hours;
(3) Sensitization: irradiating the irradiated base film by using an ultraviolet lamp with the wavelength of 200-365 nm, wherein the power of the ultraviolet lamp is 50-2000 watts, the distance between the lamp and the base film is 0.1-50 cm, and the sensitization time is 10 seconds-180 minutes;
(4) Etching: putting the sensitized base film into strong alkali or strong acid solution with the concentration of 0.1-30 equivalents for etching for 1-180 minutes;
(5) And (3) drying: and drying in an oven with the temperature of 10-150 ℃ to produce the straight hole type heavy ion microporous membrane reaching the requirement.
The filtering membrane 3 and the separation membrane 6 are both straight-hole heavy ion microporous membranes, so that the aperture of the straight-hole heavy ion microporous membranes is uniform and controllable, and particles or microorganisms with the aperture being larger than the aperture can be absolutely trapped; and when in use, the filtering membrane and the separating membrane are used for filtering and have centrifugal force, and the filtered particles can be thrown off the surface of the membrane under the action of the centrifugal force, so that the blocking of holes can not be caused.
Claims (3)
1. The utility model provides a control structure that micron and submicron level granule centrifugal filtration was collected, includes a centrifugal staving by power drive, its characterized in that:
The center of the centrifugal barrel body is provided with a barrel-shaped liquid outlet area for discharging filtered liquid, a layer of filtering membrane for filtering the liquid is wrapped around the barrel-shaped liquid outlet area, and a separation membrane for separating a space between the filtering membrane and the inner wall of the centrifugal barrel body into two independent first collecting areas and two collecting areas is arranged between the filtering membrane and the inner wall of the centrifugal barrel body;
a liquid pumping port for supplying liquid to be filtered to the collecting zone is arranged on the centrifugal barrel body at the bottom of the collecting zone corresponding to the filtering membrane and the separating membrane;
the pore diameter of the filtering membrane is smaller than that of the separating membrane;
All particles entering the collecting area from the liquid inlet of the pump are blocked between the separation membrane and the filtering membrane, the aperture of the separation membrane is larger than that of the filtering membrane, the filtered liquid with different particle sizes is contained in the centrifugal barrel, and the particles with larger aperture than the separation membrane are trapped in the collecting area between the separation membrane and the filtering membrane under the action of centrifugal force, and the particles with smaller aperture than the separation membrane are collected in the collecting area between the inner wall of the centrifugal barrel and the separation membrane;
the radial direction of the first collecting area and the second collecting area is also provided with a baffle plate for dividing each collecting area into a plurality of independent units;
the pore diameter of the filtering membrane is selected to be corresponding to the size of particles contained in the filtered liquid;
the liquid outlet area obtains clear liquid when the aperture of the filtering membrane is smaller than the diameter of the smallest particles in the filtered liquid;
the filtering membrane and the separating membrane are both straight-hole heavy ion microporous membranes, and the straight-hole heavy ion microporous membranes are microporous membranes with straight holes, which are formed by processing high polymer materials through irradiation of heavy ion accelerators and acid-base chemical etching.
2. The control structure for centrifugal filtration and collection of micron and submicron particles according to claim 1, wherein said straight pore type heavy ion microporous membrane is made of one of polyethylene terephthalate membrane, polycarbonate membrane or polyimide membrane.
3. The control structure for centrifugal filtration and collection of micron and submicron particles according to claim 1, wherein the outer layers of the filtration membrane and the separation membrane are provided with chemical fiber woven meshes which are formed by adopting nylon meshes, nylon meshes or terylene mesh materials through silk screen mechanical processing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610797678.6A CN107789892B (en) | 2016-08-31 | 2016-08-31 | Control structure for centrifugal filtration and collection of micron and submicron particles |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610797678.6A CN107789892B (en) | 2016-08-31 | 2016-08-31 | Control structure for centrifugal filtration and collection of micron and submicron particles |
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| Publication Number | Publication Date |
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| CN107789892A CN107789892A (en) | 2018-03-13 |
| CN107789892B true CN107789892B (en) | 2024-07-16 |
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| CN108728338B (en) * | 2018-07-31 | 2024-05-17 | 广州穗阳生物学研究有限公司 | Variable volume reverse flow filter and use thereof |
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| CN115501689B (en) * | 2022-09-21 | 2024-01-23 | 中复神鹰碳纤维股份有限公司 | Method for continuously classifying and collecting micron-sized particles dispersed in slurry |
| CN115301118B (en) * | 2022-10-12 | 2023-01-24 | 陕西瑞沃生物科技有限公司 | Separation device and process for preparing sodium copper chlorophyllin |
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| CN1033008C (en) * | 1991-08-21 | 1996-10-16 | 寿技王株式会社 | sedimentation centrifuge |
| US6450344B1 (en) * | 1998-08-31 | 2002-09-17 | Mazda Motor Corporation | Particle separating apparatus |
| CN201482578U (en) * | 2009-08-21 | 2010-05-26 | 照进机械有限公司 | Centrifuging barrel of centrifugal filter |
| CN103301673A (en) * | 2013-05-31 | 2013-09-18 | 吉铨精密机械(苏州)有限公司 | Centrifugal type multilayered filtering roller |
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|---|---|---|---|---|
| CN103521088A (en) * | 2013-10-25 | 2014-01-22 | 北京南洋慧通新技术有限公司 | Preparation method of heavy ion microfiltration membrane with simple cone type duct |
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