CN103224269B - Ultrafiltration membrane module with two ends for water production - Google Patents
Ultrafiltration membrane module with two ends for water production Download PDFInfo
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- CN103224269B CN103224269B CN201310159824.9A CN201310159824A CN103224269B CN 103224269 B CN103224269 B CN 103224269B CN 201310159824 A CN201310159824 A CN 201310159824A CN 103224269 B CN103224269 B CN 103224269B
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Abstract
The invention provides an ultrafiltration membrane module with two ends for water production. The ultrafiltration membrane module comprises a columnar shell, two ends of which are respectively connected with upper end covers and lower end covers. The lower end covers are integrated with longitudinal water pipelines used to form a stock solution feed pipe. The upper end covers are integrated with longitudinal water pipelines used to form a concentrate outfall sewer. One side surface of the upper portion of the ultrafiltration membrane module is provided with a plurality of upper water-production outlets which are arranged on the upper end covers. One side surface of the lower portion of the ultrafiltration membrane module is provided with lower water-production outlets which are arranged on the lower end covers. One side surface of the lower end cover longitudinal water pipeline is provided with a gas transmission port as well as a joint. The upper water-production outlets and the lower water-production outlets are disposed at the same side of the ultrafiltration membrane module. The structure of the ultrafiltration membrane module is simple, double-end water production can be realized, and water yield is high. The ultrafiltration membrane module, the concentrate outfall sewer and the stock solution feed pipe can form a braced frame. The whole ultrafiltration device requires no design of conventional big support and inflow and concentrate pipelines. As weight and size of the equipment are reduced, the equipment is convenient to transport, and floor space of an ultrafiltration plant can be reduced.
Description
Technical field
The present invention relates to the hyperfiltration membrane assembly that a kind of both-end produces water.
Background technology
Along with industrial expansion, water pollution situation is day by day serious, and the requirement of people to water treatment is more and more higher, has increasing enterprise to select ultrafiltration to carry out water treatment.Abroad, ultrafiltration is mainly used in drinking water treatment, has had a lot of waterworks to apply hyperfiltration technique and has produced running water.At home, ultrafiltration is mainly used in wastewater treatment, the reuse of industrial circle, as the pretreatment of counter-infiltration (RO).Current water and wastewater industry market at home, hyperfiltration technique obtains more application in field of industrial waste water treatment such as electric power, iron and steel, chemical industry.
Up to the present, external external pressure type ultra-filtration membrane product is mostly 8 inches of single-ended water outlet polysulfone hollow fiber ultrafiltration membrane systems, namely adopts and arranges gas-liquid import in membrane module lower end, and upside mouth is concentrate outlet, and upper end membrana oralis silk perforate goes out the mode of filtered solution.And the length of assembly is longer, be generally 1.5 ~ 2 meters.The aquifer yield impact of mode on membrane module of the single-ended water outlet of this film silk is larger, result of the test shows, when membrane fiber length is greater than 1.5 meters, membrane fiber length effect is remarkable, as be 0.6 mm when film silk internal diameter, length be 1.8 meters time, the aquifer yield of double water outlet end membrane module about exceeds 50 ~ 100 % than the aquifer yield of single-ended water outlet membrane module.
Therefore research and development have ultralow operating pressure, high strength, high resistance tocrocking, high membrane flux, the wider water quality scope of application, and aquifer yield is stable, water quality advantageous property, the large scale external compression type hollow fiber ultrafiltration membrane assembly of double water outlet end and corresponding operation method thereof, it is the Main way of hollow-fibre membrane and component technology research and development from now on, and the market demand is urgent, has a high potential.
Summary of the invention
Technical problem to be solved by this invention is to provide the hyperfiltration membrane assembly that a kind of both-end produces water, and the simple both-end that also can realize of its structure produces water.For this reason, the present invention is by the following technical solutions:
Both-end produces a hyperfiltration membrane assembly for water, it is characterized in that it comprises cylindrical shell, connects upper end cover and bottom end cover respectively at the two ends of cylindrical shell;
The integrated longitudinal ventilating water pipe of bottom end cover, for forming stoste feed pipe; Have stoste communicating pipe in bottom end cover, the stoste conveying of stoste feed pipe come is in lower distributor input cylindrical shell;
The integrated longitudinal ventilating water pipe of upper end cover, for forming dense water outfall sewer; Have dense water communicating pipe in upper end cover, the dense water of the ultrafiltration in cylindrical shell enters dense water outfall sewer through upper distributor by dense water communicating pipe;
Hyperfiltration membrane assembly upper side has upper product water out, and upper product water out is on upper end cover;
Hyperfiltration membrane assembly lower side has lower product water out, and lower product water out is on bottom end cover;
The longitudinal ventilating water pipe side of bottom end cover has blowing mouth and joint is housed;
Upper product water out and lower product water out are in the same side of hyperfiltration membrane assembly.
On the basis adopting technique scheme, the present invention also can adopt following further technical scheme:
Described upper end cover is divided into the lower region and upper zone that are spaced, upper zone is the longitudinal ventilating water pipe of described upper end cover, one end of described longitudinal ventilating water pipe female mouth that to be the male mouth other end for being connected with pipeline spigot-and-socket be for being connected with pipeline spigot-and-socket, lower region comprises the outer tube wall connected with cylindrical shell; Described upper end cover also has central tube, as described dense water communicating pipe, the height of described central tube is lower than the height of outer tube wall, the upper end of the longitudinal ventilating water pipe of upper end cover and central tube is connected, the lower end of central tube is connected with tube connector, tube connector connects with the upper distributor being connected upper end in the enclosure again, and described upper product water out is in the lower region of upper end cover.
Described bottom end cover is divided into the lower region and upper zone that are spaced, lower region is the longitudinal ventilating water pipe of described bottom end cover, one end of described longitudinal ventilating water pipe female mouth that to be the male mouth other end for being connected with pipeline spigot-and-socket be for being connected with pipeline spigot-and-socket, upper zone comprises the outer tube wall connected with cylindrical shell; Described bottom end cover also has central tube, as described stoste communicating pipe, the height of described central tube is lower than the height of outer tube wall, the lower end of the longitudinal ventilating water pipe of bottom end cover and central tube is connected, the upper end of central tube is connected with tube connector, tube connector again be connected to the lower distributor of lower end in cylindrical shell and be connected, described lower product water out is in the upper zone of bottom end cover.
Described upper end cover and bottom end cover adopt moulding, and described upper end cover adopts and bottom end cover equal dies manufactures.
The outer tube wall of described upper end cover is linked together by the upper end of positioning joint and cylindrical shell, the outer tube wall of described bottom end cover is linked together by the lower end of positioning joint and cylindrical shell, positioning joint is by opening rubber ring, concentric opening upper rack circle, tooth bar circle and anchor ear composition under opening, opening upper rack circle, tooth bar circle under opening, opening rubber ring is connected on anchor ear, opening rubber ring to be under opening upper rack circle and opening between tooth bar circle, tooth bar circle is for clamping corresponding upper end cover, bottom end cover or cylindrical shell, play fixation, opening rubber ring is for the seam at the place that is tightly connected.
Described distributor comprises center tube connector, described center tube connector has the wing that the multiple inside radially arranged have flow channel for liquids, one end of the flow channel for liquids of the described wing is communicated with the flow channel for liquids of center tube connector, and the other end has the communication port walked abreast mutually in the communication port of first end with center tube connector; The internal diameter of the external diameter of the described wing and the shell of film post matches, and the inwall of the outer peripheral face of the described wing and the shell of film post is bonding; The rear portion of the described wing has position limiting structure, and described position limiting structure has the spacing preiection matched with the step in the end of the shell of film post; The rear end face of the described wing is inclined-plane, and described position limiting structure is in the close outside left of the rear end face of the wing.
Membrane module in described shell comprises hollow fiber film thread, hollow fiber film thread is locked in cylindrical shell by epoxy resin, the inner space of cylindrical shell and the lower space of upper end cover separate by the epoxy resin being in upper end, the inner space of cylindrical shell and the upper space of bottom end cover separate by the epoxy resin being in lower end, the upper end of described hollow fiber film thread leads to the lower region of upper end cover, and the lower end of described hollow fiber film thread leads to the upper zone of bottom end cover.
Described upper product water out and lower product water out are in this side perpendicular to longitudinal ventilating water pipe bearing of trend of hyperfiltration membrane assembly.
The bottom of described bottom end cover has screwed hole, and screwed hole is used for being connected with bottom rail; The top of upper end cover has screwed hole, for being connected with upper lateral support.
Structure of the present invention is ingenious, can easily the hollow fiber ultrafiltration membrane post in membrane module be detected, be repaired, end cap can Reusability, process easy for installation, be particularly suitable for the fields such as food, beverage, medicine, chemical industry, weaving, electronics and bioengineering, be easy to promote, and obvious benefit can be brought to society.
Owing to adopting technical scheme of the present invention, present invention achieves double water outlet end, aquifer yield is large, and the present invention also has following technique effect:
1. upper end cover and bottom end cover combine the function of end cap, pipeline and support, the present invention can participate in composition support frame with dense water outfall sewer, stoste feed pipe, whole ultrafiltration apparatus is without the need to designing conventional large support, water inlet, dense water lines, weight of equipment, volume reduce is convenient to transport, can reduce ultrafiltration area of mill site.
2. structure is simple, symmetrical up and down, is easy to detect.
3. upper end cover and bottom end cover function many, rational in infrastructure, easily manufactured, and adopt after double water outlet end, upper end cover and bottom end cover be available same secondary Making mold also, significantly can reduce costs, facilitate the management of part of appliance.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the present invention when being assembled into ultrafiltration membrane integration device.
Fig. 2 is the side view of ultrafiltration integrated device shown in Fig. 1.
Fig. 3 is A-A sectional view of the present invention.
Fig. 4 is B-B sectional view of the present invention.
Fig. 5 is the schematic diagram of upper end cover.
Fig. 6 is the schematic diagram of bottom end cover.
Fig. 7 is the front view supporting distributor.
Fig. 8 is the C-C sectional view supporting distributor.
Fig. 9 is the schematic diagram of positioning joint.
Figure 10 is the explosive view of positioning joint.
Detailed description of the invention
With reference to accompanying drawing.When the present invention uses ultrafiltration membrane integration device, can make it have both-end and produce water function, this ultrafiltration membrane integration device has row or multiple row module, and often row module is provided with one or more following module.
As shown in Figure 2, this both-end produces the ultrafiltration membrane integration device module of water, be provided with biserial film post, in the intermediate gaps 100 of biserial film post, bottom outfall sewer 1 is set, top outfall sewer 2 is set directly over intermediate gaps, the bottom of the intermediate gaps of biserial film post or immediately below gas transmission main 3 is set;
Described film post adopts structure of the present invention:
It comprises cylindrical shell 9, connects upper end cover 6 and bottom end cover 5 at the two ends of cylindrical shell respectively;
The integrated longitudinal ventilating water pipe 51 of bottom end cover 5, for forming stoste feed pipe 7; Have stoste communicating pipe in bottom end cover, the stoste of being carried by stoste feed pipe 7 inputs in cylindrical shell 9 through lower distributor 91a.
The integrated longitudinal ventilating water pipe 61 of upper end cover 6, for forming dense water outfall sewer 8; Have dense water communicating pipe in upper end cover, the dense water of the ultrafiltration in cylindrical shell enters dense water outfall sewer 8 through upper distributor 91b by dense water communicating pipe;
Hyperfiltration membrane assembly upper side has upper product water out 62, and upper product water out 62 is on upper end cover 6; And be connected with top outfall sewer 2 by pipeline 21;
Hyperfiltration membrane assembly lower side has lower product water out 52, and lower product water out 52 is on bottom end cover 5; And be connected with bottom outfall sewer 1 by pipeline 11;
The longitudinal ventilating water pipe side of bottom end cover has blowing mouth 30 and joint is housed; Described joint is connected by pipeline 31 with gas transmission main 3;
Upper product water out 62 and lower product water out 52 are in the same side of hyperfiltration membrane assembly.
The bottom of bottom end cover 5 has screwed hole 53, and the bottom of bottom end cover is shelved in bottom rail 101, and screwed hole 53 is for being connected with bottom rail 101; The top of upper end cover has screwed hole 63, for being connected with upper lateral support 102; Described bottom rail 101 and upper lateral support 102 are all parts for ultrafiltration membrane integration device frame.
Extending longitudinally all along module of described bottom outfall sewer 1, top outfall sewer 2, stoste feed pipe 7, dense water outfall sewer 8.
Longitudinal bottom outfall sewer 1, top outfall sewer 2, stoste feed pipe 7 and dense water outfall sewer 8, constitute the skeleton of ultrafiltration membrane integration device perpendicular to described longitudinal bottom rail 101 and upper lateral support 102, the present invention be connected between which.
Described bottom end cover 5 is divided into the lower region and upper zone that are spaced, lower region is the longitudinal ventilating water pipe 51 of described bottom end cover, one end of described longitudinal ventilating water pipe 51 female mouth 55 that to be male mouth 54 other end for being connected with pipeline spigot-and-socket be for being connected with pipeline spigot-and-socket, when applying in ultra-filtration membrane device, the male mouth 54 of adjacent lower end lid 5 can carry out grafting with female mouth 55 thus be communicated with composition stoste feed pipe 7, and upper zone comprises the outer tube wall 56 connected with cylindrical shell 9; Described bottom end cover 5 also has central tube 57, as described stoste communicating pipe, the height of described central tube 57 is lower than the height of outer tube wall 56, also be the upper end of upper end lower than outer tube wall of central tube 57, the longitudinal ventilating water pipe 51 of bottom end cover is connected with the lower end of central tube 57, the upper end of central tube 57 is connected with tube connector 58, tube connector 58 again be connected to the lower distributor 91a of lower end in shell 9 and be connected, described lower product water out 52 is in the upper zone of bottom end cover 5.
Described upper end cover 6 is divided into the lower region and upper zone that are spaced, upper zone is the longitudinal ventilating water pipe 61 of described upper end cover, one end of described longitudinal ventilating water pipe 61 female mouth 65 that to be male mouth 64 other end for being connected with pipeline spigot-and-socket be for being connected with pipeline spigot-and-socket, when applying in ultra-filtration membrane device, the male mouth 64 of phase adjacent upper end lid 6 can carry out grafting with female mouth 65 thus be communicated with composition stoste feed pipe 7, and lower region comprises the outer tube wall 66 connected with cylindrical shell 9; Described upper end cover also has central tube 67, as described dense water communicating pipe, the height of described central tube 67 is lower than the height of outer tube wall 66, also be that the lower end of central tube 67 is on the lower end of outer tube wall, the longitudinal ventilating water pipe 61 of upper end cover is connected with the upper end of central tube 67, the lower end of central tube 67 is connected with tube connector 68, tube connector 68 again be connected to the upper distributor 91b of upper end in shell 9 and be connected, described upper product water out 62 is in the lower region of upper end cover 6.
In the present invention, described upper end cover 6 and bottom end cover 5 can adopt injection moulding manufacture, and described upper end cover 6 and bottom end cover 5 can adopt identical Making mold, as long as install on the contrary during use, and punch as blowing mouth 30 on bottom end cover 5.
The outer tube wall 66 of described upper end cover is linked together by the upper end of positioning joint 400 with cylindrical shell 9, the outer tube wall 56 of described bottom end cover is linked together by the lower end of positioning joint 400 with cylindrical shell 9, positioning joint is by opening rubber ring 401, concentric opening upper rack circle 402, under opening, tooth bar circle 403 and anchor ear 404 form, opening upper rack circle 402, tooth bar circle 403 under opening, opening rubber ring 401 is connected on anchor ear 404, opening rubber ring 401 to be under opening upper rack circle 402 and opening between tooth bar circle 403, tooth bar circle 402, 403 for clamping corresponding upper end cover 6, bottom end cover 5 or cylindrical shell 9, play fixation, opening rubber ring 401 is for sealing the seam of corresponding outer tube wall 66 with cylindrical shell 9 junction or the seam of outer tube wall 56 and cylindrical shell 9 junction.During installation, anchor ear is placed in junction, the bolt 405 of light stubborn anchor ear is to not sliding, drawing reference numeral 406 is the nut coordinated with bolt 405, after adjusting the mutual alignment of end cap and shell 9, tight a bolt 405, the outer surface of tooth bar circle clamping end cap and shell 9, play fixation, opening rubber ring seals.Above structure makes the assembling of film post very convenient, and makes the structure of film post removable, is convenient to maintenance and changes.
Described distributor 91a, 91b comprise center tube connector 911, described center tube connector has the wing 913 that the multiple inside radially arranged have flow channel for liquids 912, one end 914 of the flow channel for liquids 912 of the described wing is communicated with the flow channel for liquids 915 of center tube connector, and the other end has the communication port 917 walked abreast in communication port 916 phase of first end with center tube connector; The internal diameter of the external diameter of the described wing and the shell of film post matches, and the outer peripheral face 918 of the described wing is bonding with the inwall of the shell of film post; The rear portion of the described wing has position limiting structure 919, and described position limiting structure 919 has the spacing preiection 910 matched with the step 95 in the end of the shell of film post; The rear end face of the described wing is inclined-plane, and described position limiting structure is in the close outside left of the rear end face of the wing.The flow channel for liquids of described distributor is evenly distributed, and improves the effect of Liquid distribution and collection, and each wing also has the effect of balancing stand, installing rack, position limiting structure, can improve stability, the fastness of distributor further, and installs also more convenient; Position limiting structure 919 has leg character, can improve the stability of whole distributor further, improves the ability of its opposing fluid impact.
Membrane module in described shell 9 comprises hollow fiber film thread, hollow fiber film thread is locked in cylindrical shell 9 by epoxy resin 92, the inner space of cylindrical shell 9 and the lower space of upper end cover separate by the epoxy resin 92 being in upper end, the inner space of cylindrical shell 9 and the upper space of bottom end cover separate by the epoxy resin 92 being in lower end, the upper and lower side logical lower space of upper end cover and the upper space of bottom end cover respectively of hollow fiber film thread.
As shown in the figure, upper product water out 62 and lower product water out 52 are in this side perpendicular to longitudinal ventilating water pipe bearing of trend of hyperfiltration membrane assembly.
With clamp connection one section of transparent pipe 20 on pipeline 21 between upper product water out 62 and top outfall sewer 2, transparent pipe 20 produces supply mains 2 be connected with upper again; Lower product water out 52 and the pipeline 11 between bottom outfall sewer 1 with clip directly and produce supply mains and be connected down.
The feet 103 of described bottom rail 101 is provided with adjusting nut, can regulate the level height of described module; Upper lateral support 102 is provided with conduit saddle, is used for fixing top outfall sewer 2.
Claims (2)
1. both-end produces a hyperfiltration membrane assembly for water, it is characterized in that it comprises cylindrical shell, connects upper end cover and bottom end cover respectively at the two ends of cylindrical shell;
The integrated longitudinal ventilating water pipe of bottom end cover, for forming stoste feed pipe; Have stoste communicating pipe in bottom end cover, the stoste conveying of stoste feed pipe come is in lower distributor input cylindrical shell; One end of longitudinal ventilating water pipe is the public mouth for being connected with pipeline spigot-and-socket, and the other end is the female mouth for being connected with pipeline spigot-and-socket;
The integrated longitudinal ventilating water pipe of upper end cover, for forming dense water outfall sewer; Have dense water communicating pipe in upper end cover, the dense water of the ultrafiltration in cylindrical shell enters dense water outfall sewer through upper distributor by dense water communicating pipe; One end of longitudinal ventilating water pipe is the public mouth for being connected with pipeline spigot-and-socket, and the other end is the female mouth for being connected with pipeline spigot-and-socket;
Hyperfiltration membrane assembly upper side has upper product water out, and upper product water out is on upper end cover;
Hyperfiltration membrane assembly lower side has lower product water out, and lower product water out is on bottom end cover;
The longitudinal ventilating water pipe side of bottom end cover has blowing mouth and joint is housed;
The bottom of bottom end cover has screwed hole, and screwed hole is used for being connected with bottom rail; The top of upper end cover has screwed hole, for being connected with upper lateral support;
Described upper end cover is divided into the lower region and upper zone that are spaced, and upper zone is the longitudinal ventilating water pipe of described upper end cover, and lower region comprises the outer tube wall connected with cylindrical shell; Described upper end cover also has central tube, as described dense water communicating pipe, the height of described central tube is lower than the height of outer tube wall, the upper end of the longitudinal ventilating water pipe of upper end cover and central tube is connected, the lower end of central tube is connected with tube connector, tube connector connects with the upper distributor being connected upper end in the enclosure again, and described upper product water out is in the lower region of upper end cover;
Described bottom end cover is divided into the lower region and upper zone that are spaced, and lower region is the longitudinal ventilating water pipe of described bottom end cover, and upper zone comprises the outer tube wall connected with cylindrical shell; Described bottom end cover also has central tube, as described stoste communicating pipe, the height of described central tube is lower than the height of outer tube wall, the lower end of the longitudinal ventilating water pipe of bottom end cover and central tube is connected, the upper end of central tube is connected with tube connector, tube connector again be connected to the lower distributor of lower end in cylindrical shell and be connected, described lower product water out is in the upper zone of bottom end cover;
Described upper end cover and bottom end cover adopt moulding, and described upper end cover adopts and bottom end cover equal dies manufactures;
The outer tube wall of described upper end cover is linked together by the upper end of positioning joint and cylindrical shell, the outer tube wall of described bottom end cover is linked together by the lower end of positioning joint and cylindrical shell, positioning joint is by opening rubber ring, concentric opening upper rack circle, tooth bar circle and anchor ear composition under opening, opening upper rack circle, tooth bar circle under opening, opening rubber ring is connected on anchor ear, opening rubber ring to be under opening upper rack circle and opening between tooth bar circle, tooth bar circle is for clamping corresponding upper end cover, bottom end cover or cylindrical shell, play fixation, opening rubber ring is for the seam at the place that is tightly connected,
Described distributor comprises center tube connector, described center tube connector has the wing that the multiple inside radially arranged have flow channel for liquids, one end of the flow channel for liquids of the described wing is communicated with the flow channel for liquids of center tube connector, and the other end has the communication port walked abreast mutually in the communication port of first end with center tube connector; The internal diameter of the external diameter of the described wing and the shell of film post matches, and the inwall of the outer peripheral face of the described wing and the shell of film post is bonding; The rear portion of the described wing has position limiting structure, and described position limiting structure has the spacing preiection matched with the step in the end of the shell of film post; The rear end face of the described wing is inclined-plane, and described position limiting structure is in the close outside left of the rear end face of the wing;
Upper product water out and lower product water out are in this side perpendicular to longitudinal ventilating water pipe bearing of trend of hyperfiltration membrane assembly.
2. a kind of both-end as claimed in claim 1 produces the hyperfiltration membrane assembly of water, it is characterized in that the membrane module in described shell comprises hollow fiber film thread, hollow fiber film thread is locked in cylindrical shell by epoxy resin, the inner space of cylindrical shell and the lower space of upper end cover separate by the epoxy resin being in upper end, the inner space of cylindrical shell and the upper space of bottom end cover separate by the epoxy resin being in lower end, the upper end of described hollow fiber film thread leads to the lower region of upper end cover, and the lower end of described hollow fiber film thread leads to the upper zone of bottom end cover.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310159824.9A CN103224269B (en) | 2013-04-28 | 2013-04-28 | Ultrafiltration membrane module with two ends for water production |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310159824.9A CN103224269B (en) | 2013-04-28 | 2013-04-28 | Ultrafiltration membrane module with two ends for water production |
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| Publication Number | Publication Date |
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| CN103224269A CN103224269A (en) | 2013-07-31 |
| CN103224269B true CN103224269B (en) | 2015-06-10 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106669422A (en) * | 2016-03-01 | 2017-05-17 | 海南立昇净水科技实业有限公司 | Composite tube, assembling type filtering membrane set, membrane filtering unit and system |
| CN106669425A (en) * | 2016-03-01 | 2017-05-17 | 海南立昇净水科技实业有限公司 | Composite end cover, split mounting type filtering membrane group, membrane filtering unit and system |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202683085U (en) * | 2012-07-16 | 2013-01-23 | 北京碧水源膜科技有限公司 | Column type film component with water drained from two ends |
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- 2013-04-28 CN CN201310159824.9A patent/CN103224269B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202683085U (en) * | 2012-07-16 | 2013-01-23 | 北京碧水源膜科技有限公司 | Column type film component with water drained from two ends |
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