CN104857758B - Filtration unit and filtration apparatus containing filtration unit - Google Patents
Filtration unit and filtration apparatus containing filtration unit Download PDFInfo
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- CN104857758B CN104857758B CN201410057868.5A CN201410057868A CN104857758B CN 104857758 B CN104857758 B CN 104857758B CN 201410057868 A CN201410057868 A CN 201410057868A CN 104857758 B CN104857758 B CN 104857758B
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Abstract
The invention relates to a filtration unit, which is used for filtering a liquid, comprises a diversion member and a filtration structure, presents a non-dense structure for passing-through of the liquid, and defines a holding space having an opening for outflowing of the liquid, wherein the filtration structure covers the diversion member, makes the opening be communicated with the outside, and comprises a first filtration body presenting a non-dense structure and a second filtration body covering the first filtration body, making the opening be communicated with the outside, and presenting a non-dense structure, and the pore size of the second filtration body is more than the pore size of the first filtration body. The present invention further provides a filtration apparatus, which comprises the filtration unit and a storage container for storing water. The filtration unit has characteristics of good filtering effect, simple structure, easy maintenance, and easy carrying.
Description
Technical field
The present invention relates to a kind of filter element and the defecator containing this filter element, particularly relate to one kind and are easy to carry
And filter element easy to maintain and defecator.
Background technology
Common water treatment plant is mostly that fixed point is installed on interior, and volume is big and complex structure, it is difficult to mobile or carry.For
Drinking water quality when ensureing outgoing, possesses and is convenient for carrying and water treatment plant that drainage works well is that have its necessary.
The environment considered residing for user is different, outdoor activities or experience urgent danger, portable type water treatment plant as
Except convenient use, it is easy to maintain in addition to, it is necessary to possess good water application efficiency and suitable for by the impurity various open water supplies,
Stink, heavy metal substance are removed.
TaiWan, China patent announcement M351738 discloses a kind of Portable manual filter, is to be provided with one in a cylinder
Individual energy supplies the filtering element (cartridge) for filtering, cylinder one end to be provided with the first suction nozzle, and the other end is provided with a valve body being connected with cylinder, the valve body
The second suction nozzle, check (non-return) valve and the pipe portion for being installed with a piston piece with flexible member pushing tow are provided with, piston piece is towards pipe portion peripheral hardware
There are a trace and a pressing piece mutually supported with the trace, when user depresses pressing piece, water source is inhaled by second
Mouth is entered in cylinder, and via filtering element (cartridge) water purification is filtered into, and can directly be sucked by the first suction nozzle.Though this device small volume is carried hold
Easily, but user have to last for when using force, using inconvenience.
The case of U.S. Patent Bulletin the 6312609th provide it is a kind of it is as shown in Figure 1 be easy to carry and simple structure drainage dress
3 are put, is one filter element 32 of encapsulation in a housing 31, the filter element 32 connects one and has outlet (not shown)
Hollow conduit 33.The housing 31 includes upper shell 311 and the lower house 312 being mutually clamped, and is provided with multiple blastholes 313.
Only need to be by under the immersed in liquid level of water treatment plant 3 when using, adjusting the height of outlet there is siphonage, and water i.e. can be by entering water
Hole 313 is entered in the housing 31, and Jing after filtering unit 32 and filter, clean water can be flowed out by the outlet of hollow conduit 33.
The water purification degree of the water treatment plant 3 is relevant with the material of the filter element 32, aperture, in the case where safe drinking water is considered, it is necessary to make hole
Less filter element 32 in footpath, to filter all impurity and polluter as much as possible.But, when impurity is in filter element 32
To a certain extent, the filter element 32 may block and be difficult to play again water purification effect for middle accumulation, therefore, the water treatment plant 3
Access times it is limited.
From the foregoing, how to provide that a kind of purifying water effect is good, be easy to carry and water treatment plant easy to maintain, it is real
There are urgent needss.
The content of the invention
Therefore, the first object of the present invention, that is, providing a kind of being easy to carry and filter element easy to maintain.
Then, filter element of the present invention, is for filtering a liquid and including：
One conducting element, in un-densified structure for use, the liquid passes through, and defines one and have the confession liquid outside
The appearance storage space of the opening of outflow；And
One filtration, coats the conducting element and the opening is communicated with the external world, and is in un-densified structure including one
The first filtering bodies, and one coat first filtering bodies and the opening is communicated with the external world and the second mistake in un-densified structure
Filter body, the aperture of second filtering bodies is more than the aperture of first filtering bodies.
The second object of the present invention, that is, providing a kind of being easy to carry and filter element easy to maintain.
Then, filter element of the present invention, is for filtering a liquid and including：
One conducting element, is that in un-densified structure for use, the liquid passes through by made by a undulation degree, and defines one
The appearance storage space of the opening flowed outwardly with the confession liquid；And
One filtration, is by made by a undulation degree, to coat the conducting element and the opening is communicated with the external world, and
Including：
One has poly tetrafluoroethylene and the first filtering bodies in un-densified structure；
One coats first filtering bodies and the opening is communicated with the external world and the second filtering bodies in un-densified structure, should
The aperture of the second filtering bodies is more than the aperture of first filtering bodies, and
One antibiotic layer being folded between the conducting element and first filtering bodies；
One hollow conduit, is flowed outwardly with the opening in communication and for the liquid；And
One fixture, is for making the conducting element in combination with the filtration.
The third object of the present invention, that is, providing a kind of being easy to carry and water treatment plant easy to maintain.
Then, defecator of the present invention, holds comprising a foregoing filter element, and a storage for being used for water storage
Device.
The beneficial effects of the present invention is：The filter element simple structure is easy to carry about with one, and is carried out by second filtering bodies
Coarse filtration simultaneously protects first filtering bodies, makes that the filter element is hardly damaged and filter effect is good.
Description of the drawings
Fig. 1 is a schematic diagram, illustrates an existing water treatment plant；
Fig. 2 is a schematic diagram, illustrates the preparation method of the first preferred embodiment of filter element of the present invention；
Fig. 3 is a part sectioned view, illustrates the second preferred embodiment of filter element of the present invention；
Fig. 4 is a part sectioned view, illustrates the 3rd preferred embodiment of filter element of the present invention；And
Fig. 5 is a schematic diagram, illustrates the using method of defecator of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawings and embodiment the present invention is described in detail.
Before the present invention is described in detail, it shall be noted that in the following description content, similar element is with identical
Number to represent.
Refering to Fig. 2, the first preferred embodiment of filter element of the present invention 1 is for filtering a liquid, leading comprising one
Stream part 11 and a filtration 12.
The conducting element 11, in un-densified structure for use, the liquid passes through, and defines one and have the confession liquid outside
The appearance storage space 111 of the opening 112 of outflow.The filtration 12, coats the conducting element 11 and makes the opening 112 with extraneous phase
It is logical, and including first filtering bodies 121 in un-densified structure, and one coats first filtering bodies 121 and makes the opening
112 communicate and the second filtering bodies 122 in un-densified structure with the external world, and the aperture of second filtering bodies 122 is more than first mistake
The aperture of filter body 121.
The manufacture method of the filter element 1 can be such as, but not limited to by first filtering bodies 121, the conducting element 11 from it is lower toward
On sequentially heap poststack doubling, to retain and fix outer peripheral edge after the opening 112 flowed out for the liquid, wherein first filtering bodies 121 are
Positioned at outermost layer, and make to form the appearance storage space 111 in the conducting element 11.Fixed mode is not particularly limited, as long as energy
Enough enable the filter element 1 that siphonage occurs when being soaked in water and its filtering function is maintained.Second filtering bodies 122
It is that first filtering bodies 121 are outer first to be filtered to coating this completely by by a material doubling and behind both sides of fitting, being sheathed on
Body 121, considers second filtering bodies 122 and is required to pull down cleaning easily, and second filtering bodies 122 are only needed simply with one
As method to be fixed on first filtering bodies 121 outer, can be such as, but not limited to be fixed with rubber band.
When the filter element 1 is positioned in a liquid to be filtered, liquid will sequentially pass through second filtering bodies from extraneous
122 and after the first filtering bodies 121 filter, then flow into the conducting element 11.The function of the conducting element 11 is by filtered liquid
In being guided to the appearance storage space 111, then flow out via the opening 112.
The major function of second filtering bodies 122 is to carry out coarse filtration, to avoid the surface of the first filtering bodies 121 from forming filter
Cake (filter cake) causes the water yield of the filter element 1 to reduce；Meanwhile, filtered with hard shell encapsulation different from the past
The practice of unit, the soft texture of second filtering bodies 122 has functions that to protect first filtering bodies 121, and is prevented from
The directly contact of first filtering bodies 121 takes up the container wall of liquid or bottom and causes water yield to reduce.
It is preferred that second filtering bodies 122 are removably sheathed on outside first filtering bodies 121；When the filter element 1
After running a period of time, second filtering bodies 122 will intercept the larger impurity of many particle diameters, and after using finishing, it is only necessary to
By second filtering bodies 122 are from the outer surface removal of the first filtering bodies 121 and cleaned, you can re-use.More preferably, should
Second filtering bodies 122 are made up of a bulk material of structure, can be such as, but not limited to be selected from by under by least one
Row constitute the material of group and are formed：Polyester fiber, Fypro, and polyolefine fiber.
The material of the conducting element 11 is not particularly limited, as long as filtered liquid can be imported into the appearance storage space
111.It is preferred that the conducting element 11 and the filtration 12 are by made by a undulation degree, can be such as, but not limited to by
At least one by the material of following constituted group selected from being formed：Polyester fiber, Fypro, and polyolefine fiber.
It is preferred that first filtering bodies 121 are by politef (polytetraf luoroethy lene, abbreviation
PTFE) film is constituted.Politef has the advantages that splendid tensile strength and chemical stability, used as can be with during filtering bodies
There is provided cleanliness factor stable filter liquor.The strength of materials of first filtering bodies 121 is considered, more preferably, first filtering bodies 121 are
It is made up of poly tetrafluoroethylene and adhesive-bonded fabric, for example, poly tetrafluoroethylene is fitted with adhesive-bonded fabric, is made first filtering bodies 121
Strength enhancing.
The pore diameter range of the filtering bodies 122 of the first filtering bodies 121 and second is not particularly limited, as long as being capable of phase interworking
Conjunction makes the liquid that the Jing filter elements 1 are filtered in accordance with required water standard.It is preferred that first filtering bodies 121
Pore diameter range is 0.001 to 1.0 μm.It is preferred that the pore diameter range of second filtering bodies 122 is 50 to 300 μm.
Refering to Fig. 3, the second preferred embodiment of filter element of the present invention 1 is to filter knot comprising a conducting element 11,
12, hollow conduit 13 of structure, and a fixture 14.
The conducting element 11, is that in un-densified structure for use, the liquid passes through by made by a undulation degree, and defines one
The appearance storage space 111 of the opening 112 flowed outwardly with the confession liquid.
The filtration 12, is by made by a undulation degree, to coat the conducting element 11 and make the opening 112 with extraneous phase
It is logical, and there is poly tetrafluoroethylene including one and the first filtering bodies 121 in un-densified structure and one coat first mistake
Filter body 121 simultaneously makes the opening 112 communicate with the external world and the second filtering bodies 122 in un-densified structure, second filtering bodies 122
Aperture of the aperture more than first filtering bodies 121.
The hollow conduit 13, is to be connected with the opening 112 and flow outwardly for the liquid.
The fixture 14, is for making the conducting element 11 in combination with first filtering bodies 121.
The preparation method of the second preferred embodiment can be such as, but not limited to by first filtering bodies 121, the conducting element 11 by
Under up sequentially heap poststack doubling, to retain and fix outer peripheral edge after the opening 112 that this flows out for liquid, wherein first filtering bodies
121 is to be located at outermost layer, and makes to form the appearance storage space 111 in the conducting element 11.Then, by a termination of the hollow conduit 13
In the opening 112, and load onto the fixture 14.Fixed mode is not particularly limited, as long as soak can the filter element 1
Steep and can occur when in water siphonage and maintain its filtering function.Second filtering bodies 122 are by by a material
After doubling and both sides of fitting, first filtering bodies 121 are sheathed on outer to coating first filtering bodies 121 completely.
Refering to Fig. 4, the structure of the preferred embodiment of filter element 1 of the present invention 3rd is similar with the second preferred embodiment, different
Place is that the filtration 12 of the 3rd preferred embodiment also includes an antibiotic layer 123, and the antibiotic layer 123 is to be folded in this to lead
Between stream part 11 and first filtering bodies 121.It is preferred that the antibiotic layer 123 is nanometer silver antimicrobial layer.Again it is preferred that the antibiotic layer
123 thickness is 1 to 100nm.
Again it is preferred that the nanometer silver antimicrobial layer can be using physical deposition mode (as resistive heating evaporation, electron gun steam
The methods such as plating method, vacuum splashing and plating), deposit nano silver particles and attach to first filtering bodies 121 to adjoin the conducting element 11
Side, forms the nanometer silver antimicrobial layer.More preferably, it is by a silver-colored target being carried out into vacuum splashing and plating, the nanometer silver being formed and is resisted
Bacterium layer.
Defecator of the present invention, comprising a foregoing filter element 1, and a storage container 2 for being used for water storage.
The using method of the defecator is as shown in Figure 5：The filter element 1 is inserted in liquid, the filter element 1 and the storage is adjusted
The manner of formulation of container 2 is deposited, makes the filter element 1 higher than the outlet of the hollow conduit 13, form a height difference H, utilized
Siphon principle (siphon principle), makes liquid enter the filter element 1, flows out from the hollow conduit 13 after filtering,
In being stored in the storage container 2.The kenel of the storage container 2 is not particularly limited, vessel that can be for example general or plastic bag,
Liquid can also be directly set to be flowed in user mouth by hollow conduit 13.
The present invention puts up with following test case to be described further, however, it should be noted that the test case is only to illustrate
With, and it is not necessarily to be construed as the restriction of present invention enforcement.
＜ test cases and test and comparison example ＞
[test case 1 to 6]
Test case 1 to 6 is tested with the 3rd preferred embodiment identical filter element 1 using structure, the filtration list
The length, width and height of unit 1 are respectively 15cm, 15cm and 2cm, and the aperture of first filtering bodies 121 is 0.4 μm, second filtering bodies
122 aperture is 200 μm.
Test case 1 is that reverse osmosis (Reverse osmosis, abbreviation RO) water is tested, and the turbidity of reverse osmosis water is
0NTU.Test case 2 to 6 is to be respectively to being configured to turbidity with reverse osmosis water (water source) and outdoor soil (mud source)
The raw water sample of 27.5NTU, 71.8NTU, 121NTU, 374NTU, 675NTU, and survey is filtered respectively using defecator of the present invention
The raw water sample of examination example 2 to 6.
[test and comparison example 1 to 6]
It is to use different defecators where test and comparison example 1 to 6 is different from test case 1 to 6：Test and comparison example
1 to 6 be the NEROX-02 (thin film for 0.3 μm of aperture is filtered) for adopting NEROX to produce as main filtering bodies, and in the main filtering bodies
Apopore connect a water outlet plastic pipe, and the main filtering bodies are had into the plastic box cladding in hole with upper and lower covers, become one it is long
The wide high defecator for being respectively 20cm, 16cm and 2.5cm.Below by the defecator used by test and comparison example 1 to 6 referred to as
For " NEROX defecators ".
Test and comparison example 1 is tested reverse osmosis water, and the turbidity of reverse osmosis water is 0NTU.Test and comparison example 2 to 6 is point
Not with reverse osmosis water (water source) and open air soil (mud source) be configured to turbidity as 34.5NTU, 70.8NTU, 163NTU,
The raw water sample of 360NTU, 546NTU, and the raw water sample of test and comparison example 2 to 6 is filtered respectively using aforementioned NEROX defecators
Product.
＜ test events ＞
1. effluent flux：
During filter element of the present invention 1 to be immersed respectively the raw water sample of test case 1,2 and 6, water yield per minute is recorded,
And it is scaled effluent flux.The Water discharge flow speed test result of test case 1,2 and 6 is arranged in table 1.
NEROX defecators are immersed respectively in the raw water sample of test and comparison example 1,2 and 6, water outlet per minute is recorded
Amount, and it is scaled effluent flux.
The Water discharge flow speed test result of test and comparison example 1,2 and 6 is arranged in table 1.
Table 1
2. turbidity removal efficiency：
According to turbidity detection method NIEAW219.52C in water, test case 1 to 6 and test are measured respectively with turbidity analyser
The raw water sample turbidity of comparative example 1 to 6 and it is filtered go out water sample turbidity, and be calculated as follows turbidity removal rate：
Turbidity removal rate (%)=(raw water sample turbidity-go out water sample turbidity) ÷ raw water sample turbidity
Wherein, the turbidity for going out water sample need to be less than 3NTU, and turbidity removal rate need to can be in accordance with drinking water quality mark more than 95%
It is accurate.Test result is recorded in table 2.
3. total clump count：
According to the filter membrane method-NIEAE205.56B methods of total clump count detection method in water, measurement test case 1,5 and 6 and
The total clump count of raw water sample of test and comparison example 1,5 and 6 and it is filtered go out the total clump count of water sample, and test result is recorded
In table 2.
Wherein, according to water quality standard for drinking water, total clump count need to be less than 100CFU/ml, imply that 1 × 105CFU/100ml。
4. escherichia coli population density：
According to the filter membrane method-NIEAE230.54B methods of coli-group detection method in drinking water, measurement test case 1,
5 and 6 and test and comparison example 1,5 and 6 raw water sample escherichia coli population density and it is filtered go out water sample coli-group it is close
Degree, and test result is recorded in into table 2.
Wherein, according to water quality standard for drinking water, escherichia coli population density need to be less than 6CFU/100ml.
As shown in Table 1, the initial effluent flux in test and comparison example 1,2 and 6 is under different turbidity, and respectively 0.95,0.92
And 0.88ml/min/cm2, subsequently increase according to the time and be gradually reduced.After 30 minutes, effluent flux is respectively 0.98,
0.80 and 0.59ml/min/cm2。
As shown in Table 1, the pure water flux of test case 1 is between 1.73～1.86ml/min/cm2Between, hence it is evident that higher than test ratio
Compared with example 1 pure water flux between 0.95～1.05；Test case 2 is to test flux under low turbidity, and its initial effluent flux is
1.48ml/min/cm2, subsequently increase according to the time and be gradually reduced, after 30 minutes, effluent flux is down to 1.20ml/min/
cm2, hence it is evident that higher than using test and comparison example 2, the effluent flux tested equally under low turbidity is (between 0.92～0.80ml/
min/cm2).The turbidity of test case 6 is higher, and initial effluent flux is 1.90ml/min/cm2, subsequently according to the time increase and gradually under
Drop, after 30 minutes, effluent flux is down to 1.01ml/min/cm2, hence it is evident that higher than the effluent flux using test and comparison example 6
(between 0.88～0.59ml/min/cm2)。
As shown in Table 2, the turbidity removal rate of test case 1 to 6 and test and comparison example 1 to 6 is in accordance with portable water quality standard,
And total clump count and coliform densities of test case 1,5 and 6 is also in accordance with portable water quality standard.It has thus been shown that mistake of the present invention
Filter unit 1 can effectively suppress colony growth, and effluent quality is in accordance with portable water quality standard.
In sum, filter element of the present invention 1 and water treatment plant usage are simple, be easy to carry, and can be suitably used for various environment；
And first filtering bodies 121 are coated by second filtering bodies 122, in addition to it can carry out coarse filtration and disassembly, cleaning, more can
The first filtering bodies 121 are protected, and makes the filter effect of filter element 1 and efficiency all good.
As described above, only presently preferred embodiments of the present invention, when the scope of present invention enforcement can not be limited with this,
The simple equivalence changes made according to claims of the present invention and description generally and modification, all still belong to culvert of the present invention
In the range of lid.
Claims (12)
1. a kind of filter element, is for filtering a liquid；It is characterized in that it is included：
One conducting element, passes through in the filtered liquid of un-densified structure for use, and the Jing is filtered with a confession to define one
The opening that flows outwardly of liquid appearance storage space；And
One filtration, coats the conducting element and the opening is communicated with the external world, and including one in un-densified structure the
One filtering bodies, and one coat first filtering bodies and make the opening with the external world communicate and in un-densified structure second filtration
Body, the aperture of second filtering bodies more than first filtering bodies aperture, second filtering bodies be by least one be selected from by
The material of following constituted group is formed：Polyester fiber, Fypro, and polyolefine fiber.
2. filter element according to claim 1, it is characterised in that：The conducting element and the filtration are by a fiber
Made by material.
3. filter element according to claim 1, it is characterised in that：First filtering bodies have a politef
Film.
4. filter element according to claim 1, it is characterised in that：First filtering bodies are by politef and do not knit
Cloth is constituted.
5. filter element according to claim 1, it is characterised in that：The pore diameter range of first filtering bodies be 0.001 to
1.0μm。
6. filter element according to claim 1, it is characterised in that：The pore diameter range of second filtering bodies is 50 to 300 μ
m。
7. filter element according to claim 1, it is characterised in that：The filtration is also folded in the water conservancy diversion including one
Antibiotic layer between part and first filtering bodies.
8. filter element according to claim 1, it is characterised in that：The filter element is also connected comprising one with the opening
Hollow conduit that is logical and flowing outwardly for the filtered liquid.
9. filter element according to claim 1, it is characterised in that：The filter element also includes that one is used to make the water conservancy diversion
Fixture of the part in combination with the filtration.
10. a kind of filter element, is for filtering a liquid；It is characterized in that it is included：
One conducting element, is by made by a undulation degree, to pass through in the filtered liquid of un-densified structure for use, and defines one
The appearance storage space of the individual opening that there is a confession filtered liquid to flow outwardly；And
One filtration, is by made by a undulation degree, to coat the conducting element and the opening is communicated with the external world, and is wrapped
Include：
One has poly tetrafluoroethylene and the first filtering bodies in un-densified structure；
One coats first filtering bodies and the opening is communicated with the external world and the second filtering bodies in un-densified structure, and this second
More than the aperture of first filtering bodies, second filtering bodies are to be selected to be made up of following by least one in the aperture of filtering bodies
The material of group is formed：Polyester fiber, Fypro, and polyolefine fiber, and
One antibiotic layer being folded between the conducting element and first filtering bodies；
One hollow conduit, is flowed outwardly with the opening in communication and for the filtered liquid；And
One fixture, is for making the conducting element in combination with the filtration.
11. filter elements according to claim 10, it is characterised in that：First filtering bodies are not by politef and not
Weave cotton cloth and constituted.
12. a kind of defecators, it is characterised in that it is included：
One filter element as described in any one in claim 1 to 9；And
One storage container for being used for water storage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410057868.5A CN104857758B (en) | 2014-02-20 | 2014-02-20 | Filtration unit and filtration apparatus containing filtration unit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410057868.5A CN104857758B (en) | 2014-02-20 | 2014-02-20 | Filtration unit and filtration apparatus containing filtration unit |
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| Publication Number | Publication Date |
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| CN104857758A CN104857758A (en) | 2015-08-26 |
| CN104857758B true CN104857758B (en) | 2017-05-03 |
Family
ID=53904187
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| CN201410057868.5A Active CN104857758B (en) | 2014-02-20 | 2014-02-20 | Filtration unit and filtration apparatus containing filtration unit |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6312609B1 (en) * | 1994-09-15 | 2001-11-06 | Nerox Filter Oy | Water purification device |
| CN101168113A (en) * | 2006-10-26 | 2008-04-30 | 康那香企业股份有限公司 | Solid-liquid separating type filter material for film biological processing and filter and filtering module |
| CN201389380Y (en) * | 2009-05-02 | 2010-01-27 | 章爱恩 | Dual-effect filter element |
| CN201399277Y (en) * | 2009-02-27 | 2010-02-10 | 陈武刚 | Portable simple water filter |
-
2014
- 2014-02-20 CN CN201410057868.5A patent/CN104857758B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6312609B1 (en) * | 1994-09-15 | 2001-11-06 | Nerox Filter Oy | Water purification device |
| CN101168113A (en) * | 2006-10-26 | 2008-04-30 | 康那香企业股份有限公司 | Solid-liquid separating type filter material for film biological processing and filter and filtering module |
| CN201399277Y (en) * | 2009-02-27 | 2010-02-10 | 陈武刚 | Portable simple water filter |
| CN201389380Y (en) * | 2009-05-02 | 2010-01-27 | 章爱恩 | Dual-effect filter element |
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| Publication number | Publication date |
|---|---|
| CN104857758A (en) | 2015-08-26 |
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