CN108159884A - Nanoscale cylindrical hole conical bore filter membrane - Google Patents
Nanoscale cylindrical hole conical bore filter membrane Download PDFInfo
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- CN108159884A CN108159884A CN201711500922.9A CN201711500922A CN108159884A CN 108159884 A CN108159884 A CN 108159884A CN 201711500922 A CN201711500922 A CN 201711500922A CN 108159884 A CN108159884 A CN 108159884A
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- cylindrical hole
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
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- Water Supply & Treatment (AREA)
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- Environmental & Geological Engineering (AREA)
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- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The present invention relates to a kind of nanoscale cylindrical hole conical bore filter membranes, there are two the cylindrical holes (2) and conical bore (3) communicated for manufacture respectively on a solid material (1) i.e. filter membrane thickness direction, wherein conical bore (3) is filter opening, the end diameter of conical bore (3) is determined according to filtering requirement, in nanometer scale, the outside diameter of conical bore (3) is identical with the diameter of cylindrical hole (2), the axial length of conical bore (3) is determined according to filter opening intensity requirement, the diameter of cylindrical hole (2) is required according to maximum penetrating power, it is determined by optimization design, cylindrical hole (2) for reduce the flow resistance of filter membrane and increase filter membrane penetrating power.Under the conditions of in this way, the thickness of filter membrane of the present invention can be relatively large, so as to meet the requirement of mechanical strength of filter membrane.Filter membrane of the present invention reaches preferable performance in filter capacity, penetrating power, mechanical strength, has important application in the superfinishing filtering of water, blood etc..
Description
Technical field
The present invention relates to filter membrane field, specifically a kind of nanoscale cylindrical hole conical bore filter membrane.
Background technology
Filtering film, abbreviation filter membrane have important application in industry and daily life, it can be used for filtering out solid
Grain, impurity purify liquid, it can also be used to filter out bacterium, macromolecular substances or the separation for being used to implement two kinds of liquid.It is daily
In life, filter membrane can be used for purifying drinking water, purify various beverages, it can also be used to impurity, the various ions in seawater are filtered out, it is real
Existing seawater cleaning.Existing typical filter ways and means have：
First, activated carbon filters
Activated carbon is a kind of extremely wide industrial adsorbents of purposes, it be by the use of charcoal, various shells and fat coal etc. as
Raw material, raw material is crushed by physics and chemical method, is sieved, activation of catalyst, rinsing, drying and screening etc. it is a series of
Process fabricates.The adsorptivity of activated carbon is derived from its unique molecular configuration, and there are many holes in the inside of activated carbon, often
If the internal void drawout of gram activated carbon can reach 500~1700 square metres, exactly this unique internal structure makes
Obtaining activated carbon has excellent adsorption capacity.When activated carbon filters, due to the fine content in the adsorbable various liquid of its porosity
Matter, decoloration, deodorization, dechlorination, organics removal and the heavy metal being usually used in water process remove synthetic detergent, bacterium, virus
And the polluters such as radioactivity, it is also commonly used for the tertiary treatment of waste water.
The common application range of activated carbon filtering：(1) for water treatment facilities filtering, sewage disposal, Treated sewage reusing etc..
It is widely used in chemical industry, food, medicine, electronics photovoltaic etc..(2) for requiring delivery turbidity≤5mg/L that can meet drinking water quality
Industrial water, domestic water and the municipal water supply system of standard.(3) removal of the suspended matter, solids in trade effluent.(4)
It can be used as the pre-processing device in ion-exchange softening, desalting system, the coarse filtration of the industrial water supply not high to water quality requirement
Equipment.(5) used in swimming pool circulating treating system, cooling cycle water purification system etc..The advantage and disadvantage of activated carbon filtering：Advantage：
Activated carbon price is relatively inexpensive, and activated carbon filtering cost is relatively low, can meet general industry and the common filtration needs of daily life, resistance to
Pressure, heat-resisting, sexual valence is higher.Shortcoming：The hole of activated carbon is larger, it is difficult to realize fine filtering, it is impossible to filter out micron order and receive
The substance of meter level size, is usually used in coarse filtration.
2nd, micro-pore-film filtration
It is close and numerous on microporous barrier to be evenly distributed with each micropore, the diameter in this hole usually 0.1 micron and 100 microns it
Between.Therefore, microporous barrier can filter out liquid, gas more than 0.1um particle and bacterium, it has, and filtering accuracy is high, transition speed
Degree is fast, absorption comes off less, without medium, acid-alkali-corrosive-resisting, it is easy to operate the advantages that.Be widely used in medicine, chemical industry, electronics,
The required equipment of the industry such as beverage, fruit wine, biochemical water process, environmental protection.
Common microporous membrane filter element has：Polytetrafluoroethylene film (PTFE) filter core gathers inclined film (PVDF) filter core, polypropylene screen
(PP) filter core, cellulose acetate film (CN-CA) filter core, nylon (PN6) filter core, alloy stud, Wire-wound filter core, melt-blown filter, PA/PE
Sintered filter core.These filter core features are：It is small, light-weight, easy to use, filter area is big, plugging rate is low, the rate of filtration
Soon, pollution-free, the dilute stability of heat and chemical stability are good, can filter out most particles, be widely used in refined filtration and degerming work
Skill.
The shortcomings that micro-pore-film filtration：Compared to nano-pore filter membrane, the diameter in filtering hole is still bigger than normal on microporous barrier, although energy
Meet many refined filtration requirements in daily industry and life, but cannot be used for filtering superfine small substance such as blood purification, protein
Middle virus purification, liquid intermediate ion filter out, the super purification of water etc..
3rd, sock filtration
Micron order liquid filter bag is made using high-quality filtrate, can effectively remove the solid for needing to remove in liquid
Matter.When by micron order filter bag, impurities are accurately captured in filter bag deep layer liquid, complete filter process.Filter material
Matter：Different according to institute's filtering solution, PE felts or PP felts may be selected in filter material, and the filtrates such as nylon monofilament, polyester monofilament also can be selected, from
And it is widely used in height different temperatures, soda acid varying environment.
Similar with micro-pore-film filtration, the shortcomings that sock filtration, is：The diameter in filtering hole is still bigger than normal on filter bag, although can be full
Many refined filtration requirements in the daily industry of foot and life, but cannot be used for filtering in superfine small substance such as blood purification, protein
Virus purification, liquid intermediate ion filter out, the super purification of water etc..
4th, nano-pore membrane filtration
In order to filter pole subtitle substance, isolated viral, separation larger molecular organics etc., nano-pore filter membrane mistake must be just used
Filter.Compared to miillpore filter, the hole on nano-pore filter membrane is much smaller, and diameter is in nanometer scale, often less than by filter impurity
Molecular dimension, therefore be usually used in hyperfine filtering, impurity, bacterium, virus, organic macromolecule etc. can thoroughly be filtered out.Nanometer
Kong Changwei cylindrical holes, conical bore on the filter membrane of hole.To improve this filter membrane permeability, also have using two layers of filter membrane, upper strata is receives
Metre hole filter membrane, lower floor are miillpore filter.Also someone develops very thin monolayer nano-pore graphene filter membrane, this filter membrane
Permeability is preferable.
Although the filter capacity of nano-pore filter membrane is strong, since filter opening is minimum, this permeability of the membrane is poor, its filtering
Efficiency is than relatively low, and this film is very thin, and the mechanical strength of film also often faces the challenge, not high pressure resistant, high temperature.Filter capacity is oozed
Permeability and mechanical strength are difficult to realize well simultaneously on nano-pore filter membrane；One of which performance is met, must be reduced
Remaining performance.
Invention content
The object of the present invention is to provide a kind of nanoscale cylindrical hole conical bore filter membranes, solve nano-pore filter membrane in the prior art
Filter capacity, permeability and mechanical strength are difficult to the technical barrier well realized simultaneously.
The present invention technical solution be：
A kind of nanoscale cylindrical hole conical bore filter membrane, such as Fig. 1 are manufactured respectively on the thickness direction of a solid material (1)
There are two the conical bores (3) and cylindrical hole (2), this some holes communicated to be evenly distributed on solid material (1) surface；This solid material
Expect that (1) is filter membrane.
Conical bore (3) be filter opening, the end diameter 2R of conical bore (3)0It is determined according to filtering requirement, in nanometer scale,
The outside diameter 2R of conical bore (3)1With the diameter 2R of cylindrical hole (2)1Identical, the axial length of conical bore (3) is l0, l0Value
It is the smaller the better, because the flow resistance of filter opening can be effectively reduced in this way, so as to effectively increase the penetrating power of filter membrane, l0
Value determined according to the intensity requirement of filter opening.The filter opening of filter membrane of the present invention is superfine aperture, can filter out pole subtitle substance, is met
Super refined filtration requirement.The radius of cylindrical hole (2) is R1, R here1＞ R0；Cylindrical hole (2) is for reducing flow resistance in filter membrane
With increase filter membrane penetrating power, the radius R in the hole1It is required according to the maximum penetrating power of filter membrane, by optimization design under
Formula, which calculates, to be determined：
Here, λ0=l0The thickness of/l, l for filter membrane, l=l0+l1, l0For the axial length of conical bore (3), l1For cylindrical hole (2)
Axial length,RcrTo make to flow through the liquid of filter opening i.e. conical bore (3) as critical the half of the hole of continuous media
Diameter,ρ be environment temperature and pressure flow down filter hole liquid body phase density,To flow through filter opening
Liquid filter opening, that is, conical bore (3) small end radial direction averag density, this averag density withIt is related,η be environment temperature and pressure flow down filter hole liquid bulk viscosity,To flow through filter opening
Liquid filter opening, that is, conical bore (3) small end radial direction equivalent viscosity, this equivalent viscosity withIt is related,It is flowed for description
The parameter for the Discontinuous transmission effect that the liquid of filter hole is presented in filter opening, that is, conical bore (3) small end radial direction, also withHave
It closes.
The axial length of cylindrical hole (2) is l1, l1Value determined according to the requirement of mechanical strength of filter membrane.L is solid material
(1) thickness of filter membrane i.e. of the present invention, l=l0+l1.Therefore, the present invention has taken into account the filter capacity, penetrating power and machinery of filter membrane
Intensity requirement has significant application value.This is the signified nanoscale cylindrical hole conical bore filter membrane of the present invention.
Further, filter membrane uses plane or curved surface filter membrane.
Further, the thickness of filter membrane is identical everywhere or differs.
Further, filter membrane is fabricated by silicon nitride or graphene.
This kind of nanoscale cylindrical hole conical bore filter membrane manufactures filter membrane with one layer of solid material, and filter membrane can be plane filter membrane,
It can also be curved surface filter membrane.Filter membrane thickness can be equal everywhere or variation.
The beneficial effects of the invention are as follows：
First, filter membrane of the present invention can not only realize that superfinishing filters, also with excellent penetrating power, while when can meet filtering again
Requirement of mechanical strength.
2nd, filter membrane of the present invention is manufactured with traditional nano-pore filter membrane manufacturing technology, of low cost, but with superior filter membrane
Can, there is significant application value in the superfinishing filtering of water, blood etc..
Description of the drawings
Fig. 1 is the structure diagram of nanoscale cylindrical hole conical bore filter membrane of the embodiment of the present invention；
Fig. 2 be when filter membrane of the present invention manufactures with graphene, ultra-clean filtering is carried out to water when embodiment in drag reduction hole i.e. cylinder
Hole (2) radius R1With filter opening radius, that is, conical bore (3) small end radius R0Optimum ratio (R1/Ro)optWith λ0(=l0/ l) relationship
Figure；
Fig. 3 be when filter membrane of the present invention manufactures with silicon nitride, ultra-clean filtering is carried out to water when embodiment in drag reduction hole i.e. cylinder
Hole (2) radius R1With filter opening radius, that is, conical bore (3) small end radius R0Optimum ratio (R1/Ro)optWith λ0(=l0/ l) relationship
Figure.
In Fig. 1：1- solid materials, 2- cylindrical holes, 3- conical bores
Wherein, l0For the axial length of conical bore (3), l1For the axial length of cylindrical hole (2), l for solid material (1) i.e.
The thickness of filter membrane.
Specific embodiment
The preferred embodiment that the invention will now be described in detail with reference to the accompanying drawings.
Embodiment
The nanoscale cylindrical hole conical bore filter membrane of embodiment, as shown in Figure 1, on the thickness direction of a solid material (1)
The conical bore (3) and cylindrical hole (2), this some holes communicated there are two manufacture respectively to be evenly distributed on solid material (1) surface；
This solid material (1) is filter membrane.Conical bore (3) be filter opening, the end diameter 2R of conical bore (3)0It is determined according to filtering requirement,
In nanometer scale, the outside diameter 2R of conical bore (3)1With the diameter 2R of cylindrical hole (2)1Identical, the axial direction of conical bore (3) is long
It spends for l0, l0Value it is the smaller the better because the flow resistance of filter opening can be effectively reduced in this way, so as to effectively increasing filter membrane
Penetrating power, l0Value determined according to the intensity requirement of filter opening.The filter opening of filter membrane of the present invention is superfine aperture, can filter out pole
Subtitle substance meets super refined filtration requirement.The radius of cylindrical hole (2) is R1, R here1＞ R0；Cylindrical hole (2) is for reducing filter
Flow resistance and increase filter membrane penetrating power, the radius R in the hole in film1It is required, passed through according to the maximum penetrating power of filter membrane
Optimization design is calculated by following formula and determined：
Here, λ0=l0The thickness of/l, l for filter membrane, l=l0+l1, l0For the axial length of conical bore (3), l1For cylindrical hole (2)
Axial length,RcrTo make to flow through the liquid of filter opening i.e. conical bore (3) as critical the half of the hole of continuous media
Diameter,ρ be environment temperature and pressure flow down filter hole liquid body phase density,To flow through filter opening
Liquid filter opening, that is, conical bore (3) small end radial direction averag density, this averag density withIt is related,η be environment temperature and pressure flow down filter hole liquid bulk viscosity,To flow through filter opening
Liquid filter opening, that is, conical bore (3) small end radial direction equivalent viscosity, this equivalent viscosity withIt is related,It is flowed for description
The parameter for the Discontinuous transmission effect that the liquid of filter hole is presented in filter opening, that is, conical bore (3) small end radial direction, also withHave
It closes.The axial length of cylindrical hole (2) is l1, l1Value determined according to the requirement of mechanical strength of filter membrane.L is solid material (1) i.e. sheet
The thickness of invention filter membrane, l=l0+l1.Therefore, the filter capacity, penetrating power and mechanical strength of the invention for having taken into account filter membrane will
It asks, there is significant application value.This is the signified nanoscale cylindrical hole conical bore filter membrane of the present invention.
In one preferred embodiment, filter membrane is plane filter membrane, and filter membrane is fabricated by silicon nitride, and drainage is crossed for superfinishing,
Bacterium, dust in elimination water, pole fine impurity.Select filter opening radius i.e. conical bore (3) small end radius R0=20nm, filter opening are justified
Taper hole (3) axial length l0=400nm takes cylindrical hole (2) radius R1=115nm, cylindrical hole (2) axial length l1=99.6 μm,
The thickness of whole film is l=0.1mm.
In one preferred embodiment, filter membrane is plane filter membrane, and filter membrane is fabricated by silicon nitride, for purifying human body blood
Liquid filters off virus in blood, macromolecular foreign matter.Select filter opening radius i.e. conical bore (3) small end radius R0=7nm, filter opening, that is, circular cone
Hole (3) axial length l0=140nm takes cylindrical hole (2) radius R1=40nm, cylindrical hole (2) axial length l1It is=99.86 μm, whole
The thickness for opening film is l=0.1mm.
In one preferred embodiment, filter membrane is plane filter membrane, and filter membrane is fabricated by graphene, and drainage is crossed for superfinishing,
Bacterium, dust in elimination water, pole fine impurity.Select filter opening radius i.e. conical bore (3) small end radius R0=20nm, filter opening are justified
Taper hole (3) axial length l0=200nm takes cylindrical hole (2) radius R1=115nm, cylindrical hole (2) axial length l1=9.8 μm,
The thickness of whole film is l=0.01mm.
In one preferred embodiment, filter membrane is plane filter membrane, and filter membrane is fabricated by graphene, for purifying human body blood
Liquid filters off virus in blood, macromolecular foreign matter.Select filter opening radius i.e. conical bore (3) small end radius R0=7nm, filter opening, that is, circular cone
Hole (3) axial length l0=70nm takes cylindrical hole (2) radius R1=40nm, cylindrical hole (2) axial length l1=9.93 μm, whole
The thickness of film is l=0.01mm.
The principle of this kind of nanoscale cylindrical hole conical bore filter membrane is described as follows：
Filter membrane of the present invention is to be cleaned liquid for filtering out pole subtitle substance such as dust, bacterium, virus etc., and allowing and smoothly lead to
Filter hole flows out, and achievees the purpose that super refined filtration.To realize this purpose, filter opening diameter, that is, conical bore (3) of filter membrane of the present invention
End diameter 2R0The diameter for being filtered impurity must be less than.The viral diameters of known minimum are 17nm in the world, minimum bacterium
Diameter is 50 nanometers.In order to filter out these bacteriums and virus, filter opening diameter, that is, conical bore (3) end diameter of filter membrane of the present invention
2R0It is necessarily less than 17nm or 50nm.Therefore, to realize superfinishing filtering function, filter opening diameter, that is, conical bore (3) of filter membrane of the present invention
End diameter 2R0Horizontal in 1nm magnitudes or 10nm magnitudes, filter membrane filter opening of the present invention belongs to superfine small filter opening.
Consider the requirement of mechanical strength proposed in filter process to filter membrane, it is of the invention as made of silicon nitride with conventional material
The thickness l of filter membrane need to usually reach 0.1mm.If the whole thickness l of filter membrane of the present invention, filter opening are penetrated using single filter opening
Axial length seems very big, and the draw ratio of filter opening greatly (reaches 104).It is difficult to flow through this not only thin but also length filter to be cleaned liquid to be
Hole, the penetrating power of such filter membrane just becomes very poor.
In fact, in the present invention filter opening, that is, conical bore (3) axial length l0The thickness l of filter membrane need not be reached, only needed
Consider the intensity requirement of filter opening, that is, conical bore (3), reserve necessary filter opening i.e. conical bore (3) axial length l0.In this way, just
It can achieve the purpose that superfinishing filters.On the other hand, in order to reduce the resistance for being cleaned liquid flow filter membrane, increase the infiltration of filter membrane
Ability, in remaining filter membrane thickness (l-l0) on, a diameter of 2R need to be opened up1Bigger cylindrical hole (R1＞ R0), this hole is known as
Drag reduction hole.In the present invention, drag reduction hole has preferable concentricity with filter opening.In this way, the diameter 2R in drag reduction hole1If too small, no
It is good, it is impossible to achieve the purpose that effectively to lower the resistance for being cleaned liquid flow filter membrane, increase filter membrane penetrating power.And drag reduction hole
Diameter 2R1It is excessive, it is also bad；Although the diameter 2R in drag reduction hole1Increase can reduce and be cleaned single hole on liquid flow filter membrane
Resistance, still, for a given filter membrane, its surface area is given, the diameter 2R in drag reduction hole1Increase can make filter membrane
The sum of upper filter opening reduces, and the penetrating power of filter membrane is made to be deteriorated instead in this way, reduces the flow for being cleaned liquid flow filter membrane.
Therefore, the diameter 2R in drag reduction hole how is chosen in the present invention1It is crucial.
Based on fluid flow theory in nanochannel, the present invention obtains making filter membrane penetrating power to reach maximum optimal subtracting
Hinder hole, that is, cylindrical hole (2) radius R1With filter opening radius, that is, conical bore (3) small end radius R0Relationship below need to be met：
Here, λ0=l0The thickness of/l, l for filter membrane, l=l0+l1, l0For the axial length of conical bore (3), l1For cylindrical hole (2)
Axial length,RcrTo make to flow through the liquid of filter opening i.e. conical bore (3) as critical the half of the hole of continuous media
Diameter,ρ be environment temperature and pressure flow down filter hole liquid body phase density,To flow through filter opening
Liquid filter opening, that is, conical bore (3) small end radial direction averag density, this averag density withIt is related,η be environment temperature and pressure flow down filter hole liquid bulk viscosity,To flow through filter opening
Liquid filter opening, that is, conical bore (3) small end radial direction equivalent viscosity, this equivalent viscosity withIt is related,It is flowed for description
The parameter for the Discontinuous transmission effect that the liquid of filter hole is presented in filter opening, that is, conical bore (3) small end radial direction, also withHave
It closes.
Due to cylindrical hole (2) radius R1Than conical bore (3) small end radius R0Much greater, filter opening uses big end in the present invention
Radius is R1It is R with small end radius0Conical bore (and non-radius be R0Cylindrical hole) fluid can be greatly reduced in filter opening
Flow resistance significantly increases the flow of fluid in filter opening, effectively improves present invention filter permeability of the membrane.
It is the principle of the present invention above.Superfinishing filter capacity is not only had according to the filter membrane of the present invention that the principle designs,
It is also equipped with excellent penetrating power and enough mechanical strengths.
When filter membrane of the present invention is manufactured with graphene, when carrying out ultra-clean filtering to water, Fig. 2 gives in embodiment drag reduction hole i.e.
Cylindrical hole (2) radius R1With filter opening radius, that is, conical bore (3) small end radius R0Optimum ratio (R1/Ro)optWith λ0(=l0/ l)
Relationship." equation prediction " refers to formula (1) result of calculation in figure, and " numerical solution " exponential quantity calculates
As a result.In figure,RcrTo make to flow through critical radius of the water of filter opening as the hole of continuous media.As it is clear from fig. 2 that formula
(1) computational accuracy is satisfactory.
Fig. 2 shows with λ0Increase, (R1/R0)optValue be reduced rapidly；For given λ0Value, withIncrease,
(R1/R0)optValue increase.
When filter membrane of the present invention is manufactured with silicon nitride, when carrying out ultra-clean filtering to water, Fig. 3 gives in embodiment drag reduction hole i.e.
Cylindrical hole (2) radius R1With filter opening radius, that is, conical bore (3) small end radius R0Optimum ratio (R1/Ro)optWith λ0(=l0/ l)
Relationship." equation prediction " refers to formula (1) result of calculation in figure, and " numerical solution " exponential quantity calculates
As a result.In figure,RcrTo make to flow through critical radius of the water of filter opening as the hole of continuous media.
Fig. 3 show whenDuring down to 0.15, for all λ0Value, the result of calculation of formula (1) have certain error.But
WhenDuring more than 0.3, the result of calculation of formula (1) or satisfactory.Bigger, then the calculating error of formula (1) is lower.
Claims (6)
1. a kind of nanoscale cylindrical hole conical bore filter membrane, it is characterised in that：On the thickness direction of one layer of solid material (1) respectively
The conical bore (3) and cylindrical hole (2), this some holes that there are two manufactures communicates to be evenly distributed on solid material (1) surface, circular cone
Hole (3) be filter opening, the end diameter 2R of conical bore (3)0Determined according to filtering requirement, in nanometer scale, conical bore (3) it is big
Hold diameter 2R1With the diameter 2R of cylindrical hole (2)1Identical, the axial length of conical bore (3) is l0, l0Value it is the smaller the better because
The flow resistance of filter opening can be effectively reduced in this way, so as to effectively increase the penetrating power of filter membrane, l0Value according to filter opening
Intensity requirement determine；The radius of cylindrical hole (2) is R1, R here1＞ R0；The axial length of cylindrical hole (2) is l1, l1Value root
It is determined according to the requirement of mechanical strength of filter membrane；Thickness of the l for filter membrane, l=l0+l1；This solid material (1) is filter membrane.
2. a kind of nanoscale cylindrical hole conical bore filter membrane as described in claim 1, it is characterised in that：Cylindrical hole (2) need to be with circle
With one heart, cylindrical hole (2) and the concentricity tolerance of conical bore (3) are not more than conical bore (3) small end radius R to taper hole (3)0Ten/
One.
3. a kind of nanoscale cylindrical hole conical bore filter membrane as described in claim 1, it is characterised in that：Cylindrical hole (2) is to be used for
Reduce flow resistance in filter membrane and increase filter membrane penetrating power, the radius R in the hole1It will according to the maximum penetrating power of filter membrane
It asks, is calculated and determined by following formula by optimization design：
Here, λ0=l0The thickness of/l, l for filter membrane, l=l0+l1, l0For the axial length of conical bore (3), l1For cylindrical hole (2)
Axial length,RcrTo make to flow through the liquid of filter opening i.e. conical bore (3) as critical the half of the hole of continuous media
Diameter,ρ be environment temperature and pressure flow down filter hole liquid body phase density,To flow through filter opening
Liquid filter opening, that is, conical bore (3) small end radial direction averag density, this averag density withIt is related,η be environment temperature and pressure flow down filter hole liquid bulk viscosity,To flow through filter opening
Liquid filter opening, that is, conical bore (3) small end radial direction equivalent viscosity, this equivalent viscosity withIt is related,It is flowed for description
The parameter for the Discontinuous transmission effect that the liquid of filter hole is presented in filter opening, that is, conical bore (3) small end radial direction, also withHave
It closes.
4. such as a kind of nanoscale cylindrical hole conical bore filter membrane of claim 1-3 any one of them, it is characterised in that：Filter membrane is flat
Face or curved surface filter membrane.
5. such as a kind of nanoscale cylindrical hole conical bore filter membrane of claim 1-3 any one of them, it is characterised in that：The thickness of filter membrane
Degree is identical everywhere or differs.
6. such as a kind of nanoscale cylindrical hole conical bore filter membrane of claim 1-3 any one of them, it is characterised in that：Filter membrane is by nitrogen
SiClx or graphene are fabricated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711500922.9A CN108159884A (en) | 2017-12-22 | 2017-12-22 | Nanoscale cylindrical hole conical bore filter membrane |
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| CN201711500922.9A CN108159884A (en) | 2017-12-22 | 2017-12-22 | Nanoscale cylindrical hole conical bore filter membrane |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102039273B1 (en) * | 2018-08-24 | 2019-10-31 | (주)에이툴즈 | Filter assembly for Air cleaner machine |
| CN113713614A (en) * | 2021-09-09 | 2021-11-30 | 山东友成生物科技有限公司 | Process equipment and preparation method of acetamide fiber targeting agent |
-
2017
- 2017-12-22 CN CN201711500922.9A patent/CN108159884A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102039273B1 (en) * | 2018-08-24 | 2019-10-31 | (주)에이툴즈 | Filter assembly for Air cleaner machine |
| CN113713614A (en) * | 2021-09-09 | 2021-11-30 | 山东友成生物科技有限公司 | Process equipment and preparation method of acetamide fiber targeting agent |
| CN113713614B (en) * | 2021-09-09 | 2023-06-09 | 山东友成生物科技有限公司 | Process and preparation method of acetamide fiber targeting agent |
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Application publication date: 20180615 |
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| WD01 | Invention patent application deemed withdrawn after publication |