CN209428257U - A kind of composite filter element component and water purification system - Google Patents
A kind of composite filter element component and water purification system Download PDFInfo
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- CN209428257U CN209428257U CN201822117934.XU CN201822117934U CN209428257U CN 209428257 U CN209428257 U CN 209428257U CN 201822117934 U CN201822117934 U CN 201822117934U CN 209428257 U CN209428257 U CN 209428257U
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- central tube
- filter element
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- coating
- composite filter
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Abstract
The utility model relates to a kind of composite filter element components, comprising: central tube；Reverse osmosis film layer, the reverse osmosis film layer are covered on the outside of the central tube；Postposition carbon-coating, the postposition carbon-coating are arranged in the inside of the central tube or are arranged between the central tube and the reverse osmosis film layer.Further relate to a kind of water purification system.It the advantage is that, by carrying out central tube, reverse osmosis film layer and postposition carbon-coating to be compounded to form composite filter element component, the volume for not only greatly reducing composite filter element component has also been removed individual bearing shell and sealing structure, so that composite filter element component is more integrated；Postposition carbon-coating is detachably connected with central tube, is individually replaced convenient for subsequent to different filter layers, to improve the service life of composite filter element component, reduces use cost.
Description
Technical field
The utility model relates to water-treatment technology field more particularly to a kind of composite filter element component and water purification systems.
Background technique
Existing water treatment facilities is usually connected by multiple filter cores, and filter core successively filters one by one, to complete the purification of water.
Since single filter core occupies certain volume, cause entire element kit size larger.
In order to solve the problems, such as that element kit is larger-size, existing composite filter element component is by being in same by multiple filter membranes
Heart circle design, so that element kit size greatly reduces.
But this solution, there are still certain problem, such as each filtering film component still needs individual pressure-bearing
Shell and sealing structure, leading to composite filter element component, structure is complicated, and manufacturing cost is high.Further, since each filtration module
The service life of part is different, when a certain filtering film component can not be filtered, needs integrally to carry out composite filter element component
Replacement leads to the waste of composite filter element component, and then increases use cost.
Therefore, it needs that a kind of structure is simple, and manufacturing cost is cheap, and is easy carry out each filtering film component independent
The composite filter element component of replacement.
Utility model content
The purpose of this utility model is aiming at the shortcomings in the prior art, to provide a kind of composite filter element component and water purification system
System.
To achieve the above object, the technical scheme adopted by the utility model is that:
A kind of composite filter element component, comprising:
Central tube；
Reverse osmosis film layer, the reverse osmosis film layer are covered on the outside of the central tube；
Postposition carbon-coating, the central tube is arranged in the postposition carbon-coating inside or setting are in the central tube and described anti-
Between osmotic membrane layer.
Preferably, the postposition carbon-coating is to be detachably connected with the central tube.
Preferably, the postposition carbon-coating is carbon-point, and the postposition carbon-coating is removably disposed in the inside of the central tube.
Preferably, the outer diameter of the postposition carbon-coating is less than or equal to the internal diameter of the central tube.
Preferably, further includes:
First cover, first cover are connect with the first end of the central tube；
Second cover, second cover are connect with the second end of the central tube.
Preferably, first cover further include:
The outside of first cover is arranged in retaining ring, the retaining ring, and the retaining ring and first cover are in concentric circles
Setting.
Preferably, first cover includes water outlet, and the center of first cover is arranged in the water outlet.
Preferably, first cover further includes discharge outlet, and the outside of the water outlet is arranged in the discharge outlet.
Preferably, second cover is sealing cover；Or
Second cover includes water inlet, and the center of second cover is arranged in the water inlet.
Preferably, further includes:
Second central tube, second central tube are removably disposed in the first end of the central tube.
Preferably, the postposition carbon-coating is Flat carbon membranes, and the postposition carbon-coating covers the outside of the central tube.
Preferably, further includes:
Front filter element layer, the front filter element layer are covered on the outside of the reverse osmosis film layer.
Preferably, the front filter element layer is flat panel cartridge film, and the front filter element layer is covered on the reverse osmosis film layer
Outside.
Preferably, the front filter element layer is line filter core, and the front filter element layer winds the outside of the reverse osmosis film layer.
The utility model also provides a kind of water purification system, including composite filter element component as described above.
The utility model is had the following technical effect that compared with prior art using above technical scheme
A kind of composite filter element component and water purification system of the utility model, by by central tube, reverse osmosis film layer and postposition
Carbon-coating carries out being compounded to form composite filter element component, not only greatly reduces the volume of composite filter element component, has also been removed individually
Bearing shell and sealing structure, so that composite filter element component is more integrated；Postposition carbon-coating is detachably connected with central tube,
Different filter layers is individually replaced convenient for subsequent, to improve the service life of composite filter element component, reduce use at
This.
Detailed description of the invention
Fig. 1 is the longitudinal section cross-sectional view of an illustrative examples of the utility model.
Fig. 2 is the cross section view of an illustrative examples of the utility model.
Fig. 3 is the longitudinal section cross-sectional view of a preferred embodiment of the utility model.
Fig. 4 is the cross section view of a preferred embodiment of the utility model.
Fig. 5 is the longitudinal section cross-sectional view of a preferred embodiment of the utility model.
Fig. 6 is the longitudinal section cross-sectional view of a preferred embodiment of the utility model.
Fig. 7 is the longitudinal section cross-sectional view of a preferred embodiment of the utility model.
Fig. 8 is the longitudinal section cross-sectional view of a preferred embodiment of the utility model.
Fig. 9 is the cross section view of a preferred embodiment of the utility model.
Appended drawing reference therein are as follows: central tube 1；Reverse osmosis film layer 2；Postposition carbon-coating 3；First cover 4；Second cover 5；Before
Set filter core layer 6；Water hole 7；Water outlet 8；Water inlet 9；Discharge outlet 10；Second central tube 11.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are in the premise for not making creative work
Under every other embodiment obtained, fall within the protection scope of the utility model.
It should be noted that in the absence of conflict, the feature in the embodiments of the present invention and embodiment can
To be combined with each other.
The utility model is described in further detail in the following with reference to the drawings and specific embodiments, but not as the utility model
It limits.
Embodiment 1
One illustrative examples of the present embodiment the utility model, as shown in Fig. 1~2, a kind of composite filter element component, packet
Central tube 1, reverse osmosis film layer 2, postposition carbon-coating 3, the first cover 4 and the second cover 5 are included, reverse osmosis film layer 2 is covered on central tube 1
Outside, the inside of the centrally disposed pipe 1 of postposition carbon-coating 3, the first end of the centrally disposed pipe 1 of the first cover 4, the second cover 5
The second end of centrally disposed pipe 1.
Central tube 1 is a hollow tube comprising a plurality of water holes 7, water hole 7 are uniformly distributed along the axial direction of central tube 1,
Water hole 7 runs through the outer wall and inner wall of central tube 1.
Water hole 7 is symmetrical in a ring on central tube 1, and at least two column water holes 7 are distributed in central tube 1, i.e.,
The angle between symmetrically arranged two water holes 7 in same level is 180 °.
Further, three column water holes 7 are distributed in central tube 1, i.e., symmetrically arranged two in same level cross water
Angle between hole 7 is 120 °；Or four column water holes 7 are distributed in central tube 1, symmetrically arranged two mistakes in same level
Angle between water hole 7 is 90 °.
In the present embodiment, the axial direction of water hole 7 and central tube 1 is radial parallel.
Reverse osmosis film layer 2 is with certain thickness reverse osmosis membrane, a few rear shapes of the outer wall of reverse osmosis membrane winding central tube 1
It winds to form cylindric reverse osmosis film layer 2 at reverse osmosis film layer 2 or reverse osmosis membrane, during then reverse osmosis film layer 2 is set in
The outer wall of heart pipe 1.
The internal diameter of reverse osmosis film layer 2 is equal to the outer diameter of central tube 1.
Further, reverse osmosis film layer 2 is made of low-pressure reverse osmosis membrane, so that reverse osmosis film layer 2 need not be in extraneous high pressure
Under the action of, water can be filtered.
Postposition carbon-coating 3 is carbon-point, specifically, being active carbon stick.The outer diameter of postposition carbon-coating 3 is less than or equal to central tube 1
Internal diameter.
Further, postposition carbon-coating 3 can be solid carbon-point, be also possible to hollow carbon-point.
First cover 4 is to be threadedly coupled with the first end of central tube 1, and the first cover 4 is provided centrally with one through first
The water outlet 8 of cover 4, water outlet 8 are directed at the center of the first end of postposition carbon-coating 3.
Second cover 5 is to be threadedly coupled with the second end of central tube 1.
First cover 4 has an edge, and when so that the first cover 4 being connect with central tube 1, the edge of the first cover 4 can
Block the first end of reverse osmosis film layer 2.Second cover 5 equally has an edge, when so that the second cover 5 being connect with central tube 1,
The edge of second cover 5 can block the second end of reverse osmosis film layer 2.
The application method of the present embodiment are as follows: the water for needing to purify passes through the mistake of central tube 1 after the filtering of reverse osmosis film layer 2
Water hole 7 enters postposition carbon-coating 3, and water is discharged after the filtering of postposition carbon-coating 3 from the water outlet 8 of the first cover 4.
Advantage of this embodiment is that composite filter element modular construction is simple, convenient for large-scale production, production cost is reduced；
Installing and dismounting is simple and efficient, replaces convenient for subsequent to different filter layers, to extend the service life of composite filter element component.
The present embodiment also provides a kind of water purification system comprising composite filter element component, uses the composite filter element group of the present embodiment
After part, the volume of water purification system is greatly reduced, and use cost reduces, and Operation and Maintenance is simple and convenient.
Embodiment 2
The present embodiment be the utility model an illustrative examples, the present embodiment the difference from embodiment 1 is that: after
The position for setting carbon-coating 3 is different.
As shown in figs. 34, a kind of composite filter element component, including central tube 1, reverse osmosis film layer 2, postposition carbon-coating 3, first
Cover 4 and the second cover 5, reverse osmosis film layer 2 are covered on the outside of central tube 1, the centrally disposed pipe 1 of postposition carbon-coating 3 and reverse osmosis
Between permeable membrane layer 2, the first end of the centrally disposed pipe 1 of the first cover 4, the second end of the centrally disposed pipe 1 of the second cover 5.
The structure of central tube 1, the first cover 4 and the second cover 5 is with embodiment 1, and details are not described herein.
Postposition carbon-coating 3 is with certain thickness Flat carbon membranes, specifically, being activated charcoal membrane.Activated charcoal membrane winds center
A few rear formation postposition carbon-coatings 3 of the outer wall of pipe 1 or activated charcoal membrane wind to form cylindric postposition carbon-coating 3, then postposition carbon
Layer 3 is set in the outer wall of central tube 1.
The internal diameter of postposition carbon-coating 3 is equal to the outer diameter of central tube 1.
Reverse osmosis film layer 2 is with certain thickness reverse osmosis membrane, and reverse osmosis membrane winds the outer wall of postposition carbon-coating 3 after a few
It forms reverse osmosis film layer 2 or reverse osmosis membrane winds to form cylindric reverse osmosis film layer 2, then reverse osmosis film layer 2 is set in
The outer wall of postposition carbon-coating 3.
The internal diameter of reverse osmosis film layer 2 is equal to the outer diameter of postposition carbon-coating 3.
The application method of the present embodiment are as follows: the water for needing to purify enters postposition carbon-coating 3, water after the filtering of reverse osmosis film layer 2
Enter the inside of central tube 1, water and then going out from the first cover 4 by the water hole 7 of central tube 1 after the filtering of postposition carbon-coating 3
The mouth of a river 8 is discharged.
The present embodiment also provides a kind of water purification system comprising composite filter element component, uses the composite filter element group of the present embodiment
After part, the volume of water purification system is greatly reduced, and use cost reduces, and Operation and Maintenance is simple and convenient.
Embodiment 3
The present embodiment is a preferred embodiment of the utility model, and the present embodiment is related to the first cover 4 and the second cover 5
Mounting means.
As shown in figure 5, a kind of composite filter element component, including central tube 1, reverse osmosis film layer 2, postposition carbon-coating 3, first lid
Portion 4 and the second cover 5, reverse osmosis film layer 2 are covered on the outside of central tube 1, the inside of the centrally disposed pipe 1 of postposition carbon-coating 3,
The first end of the centrally disposed pipe 1 of first cover 4, the second end of the centrally disposed pipe 1 of the second cover 5.
Central tube 1 and the structure of the central tube 1 of embodiment 1 are essentially identical, the first end of the central tube 1 of the present embodiment and
Two ends are respectively arranged with threaded annular groove.
First cover 4 is provided with screw thread corresponding with threaded annular groove with the side that the first end of central tube 1 connects
Annular projection.
Second cover 5 is provided with screw thread corresponding with threaded annular groove with the side that the second end of central tube 1 connects
Annular projection.
The length of postposition carbon-coating 3 and the equal length of central tube 1.
It further, further include the mounting means of another first cover 4 and the second cover 5 and central tube 1.
As shown in fig. 6, the side that the first cover 4 is connect with the first end of central tube 1 is provided with cylindrical thread protrusion, it should
The outer diameter of protrusion is equal to the internal diameter of central tube 1.
The side that second cover 5 is connect with the second end of central tube 1 is provided with cylindrical thread protrusion, the outer diameter of the protrusion
Equal to the internal diameter of central tube 1.
The length of postposition carbon-coating 3 is less than the length of central tube 1.
Also, in this mounting means, the cylindrical protrusions of the first cover 4 are provided at least one annular retaining ring, use
In preventing water from overflowing.Likewise, the cylindrical protrusions of the second cover 5 are provided at least one annular retaining ring, for preventing water from overflowing
Out.
The present embodiment also provides a kind of water purification system comprising composite filter element component, uses the composite filter element group of the present embodiment
After part, the volume of water purification system is greatly reduced, and use cost reduces, and Operation and Maintenance is simple and convenient.
Embodiment 4
The present embodiment be the utility model a preferred embodiment, the present embodiment the difference from embodiment 1 is that: also wrap
Include the second central tube 11.
As shown in fig. 7, a kind of composite filter element component, including central tube 1, reverse osmosis film layer 2, postposition carbon-coating 3, first lid
Portion 4, the second cover 5 and the second central tube 11, reverse osmosis film layer 2 are separately positioned on the outer of central tube 1 and the second central tube 11
Side, the inside of the centrally disposed pipe 1 of postposition carbon-coating 3, the first cover 4 are separately connected the first end and the second central tube of central tube 1
11 second end, another first cover 4 are mounted on the first end of the second central tube 11, and the second cover 5 is mounted on the of central tube 1
Two ends.
The first end of central tube 1 has a threaded annular groove, and the second end of the second central tube 11 is provided with and central tube 1
Threaded annular groove corresponding threaded annular protrusion.
The internal diameter and outer diameter of central tube 1 are equal with the internal diameter of the second central tube 11 and outer diameter respectively.
The outer diameter of first the first cover 4 is equal to the internal diameter of central tube 1, and first cover 4 is externally threaded to be provided with
Cylindrical body, and it is equipped with the water outlet 8 of the first end and second end through the first cover 4.First cover 4 respectively with central tube
The inner wall of the second end of the inner wall of 1 first end and the second central tube 11 is threadedly coupled.
The side that second the first cover 4 is connect with the first end of the second central tube 11 is provided with cylindrical thread protrusion,
The outer diameter of the protrusion is equal to the internal diameter of the second central tube 11.
The side that second cover 5 is connect with the second end of central tube 1 is provided with cylindrical thread protrusion, the outer diameter of the protrusion
Equal to the internal diameter of central tube 1.
There is reverse osmosis film layer 2 in the outer side covering of central tube 1, the length of the reverse osmosis film layer 2 and the length of central tube 1
It is equal.
Likewise, the outer side covering in the second central tube 11 has reverse osmosis film layer 2, the length of the reverse osmosis film layer 2 and the
The equal length of two central tubes 11.
The inside of the centrally disposed pipe 1 of postposition carbon-coating 3, and the length of postposition carbon-coating 3 is less than the length of central tube 1.
The not set water hole of second central tube 11, so that the water edge that the reverse osmosis film layer 2 in 11 outside of the second central tube filters
The outer wall of second central tube 11 flows to the water hole 7 of central tube 1.
In the present embodiment, the inside of the second central tube 11 has the function of storing purified water, is made with providing a buffering
With.
The application method of the present embodiment is as follows: the water for needing to purify passes through central tube 1 after the filtering of reverse osmosis film layer 2
Water hole 7 enters postposition carbon-coating 3, and water is expelled to second from the water outlet 8 of first the first cover 4 after the filtering of postposition carbon-coating 3
The inside of central tube 11, then purified water is discharged by the water outlet 8 of second the first cover 4.
Further, it is also equipped with postposition carbon-coating 3 in the inside of the second central tube 11, which plays a depth
Spend catharsis.
Further, based on the above technical solution, the second central tube 11 is also equipped with water hole, the second central tube
Distribution mode of the distribution mode of water hole on 11 with the water hole 7 of central tube 1.
The present embodiment also provides a kind of water purification system comprising composite filter element component, uses the composite filter element group of the present embodiment
After part, the volume of water purification system is greatly reduced, and use cost reduces, and Operation and Maintenance is simple and convenient.
Embodiment 5
The present embodiment be the utility model a preferred embodiment, the present embodiment the difference from example 2 is that, also wrap
It is different with the structure of the second cover 5 to include front filter element layer 6 and the first cover 4.
As shown in Fig. 8~9, a kind of composite filter element component, including central tube 1, reverse osmosis film layer 2, postposition carbon-coating 3, first
Cover 4, the second cover 5 and front filter element layer 6, reverse osmosis film layer 2 are covered on the outside of central tube 1, and the setting of postposition carbon-coating 3 exists
Between central tube 1 and reverse osmosis film layer 2, front filter element layer 6 is covered on the outside of reverse osmosis film layer 2, and the first cover 4 is arranged in
The first end of heart pipe 1, the second end of the centrally disposed pipe 1 of the second cover 5.
Central tube 1, the structure of reverse osmosis film layer 2 and postposition carbon-coating 3 and connection type are with embodiment 2, and details are not described herein.
Front filter element layer 6 is with certain thickness flat panel filter film, and flat panel filter film winds the outer of reverse osmosis film layer 2
A few rear front filter element layer 6 or flat panel filter film rolls of being formed of wall are around the front filter element layer 6 for forming cylindrical shape, then preposition filter
Sandwich layer 6 is set in the outer wall of reverse osmosis film layer 2.
The internal diameter of front filter element layer 6 is equal to the outer diameter of reverse osmosis film layer 2.
Further, front filter element layer 6 can also be that line filter core, line filter core directly wind the outer wall of reverse osmosis film layer 2 extremely
Front filter element layer 6 is formed after a few circle.
First cover 4 includes water outlet 8 and discharge outlet 10, and water outlet 8 is arranged in the center of the first cover 4 and through first
Cover 4, discharge outlet 10 are arranged in the outside of water outlet 8 and through the first covers 4, and discharge outlet 10 is directed at the of front filter element layer 6
The first end of one end or the reverse osmosis film layer 2 of alignment.
Further, it is preferable to, discharge outlet 10 is directed at the first end of reverse osmosis film layer 2.
Discharge outlet 10 can be through-hole, be also possible to annular groove.
Second cover 5 includes water inlet 9, and water inlet 9 runs through the second cover 5, and the longitudinally cutting face of water inlet 9 is in
Y-shaped, i.e. water inlet 9 are directed at front filter element layer 6 in the outlet of the first end of the second cover 5.
The application method of the present embodiment are as follows: water, which enters front filter element layer 6 through the water inlet 9 of the second cover 5, to carry out for the first time
Filtering；Filtered water forms waste water and second of filtered water after reverse osmosis film layer 2 carries out second filtering for the first time,
Waste water is discharged from the discharge outlet 10 of the first cover 4；Second of filtered water forms net through the progress third time filtering of postposition carbon-coating 3
Change water；Purified water enters the inside of central tube 1 through the water hole 7 of central tube 1, is then discharged from the water outlet 8 of the first cover 4.
Advantage of this embodiment is that front filter element layer is directly compound with the progress of reverse osmosis film layer, it is not necessarily to front filter element
The bearing shell of layer, reduces manufacturing cost.
The present embodiment also provides a kind of water purification system comprising composite filter element component, uses the composite filter element group of the present embodiment
After part, the volume of water purification system is greatly reduced, and use cost reduces, and Operation and Maintenance is simple and convenient.
The foregoing is merely the utility model preferred embodiment, be not intended to limit the embodiments of the present invention and
Protection scope should can appreciate that all in the utility model specification and diagram to those skilled in the art
Hold made equivalent replacement and obviously change obtained scheme, the protection model of the utility model should all be included in
In enclosing.
Claims (10)
1. a kind of composite filter element component characterized by comprising
Central tube (1)；
Reverse osmosis film layer (2), the reverse osmosis film layer (2) are covered on the outside of the central tube (1)；
Postposition carbon-coating (3), postposition carbon-coating (3) setting is in the inside of the central tube (1) or setting in the central tube (1)
Between the reverse osmosis film layer (2).
2. composite filter element component according to claim 1, which is characterized in that the postposition carbon-coating (3) is carbon-point, after described
Set the inside that carbon-coating (3) is removably disposed in the central tube (1).
3. composite filter element component according to claim 2, which is characterized in that the outer diameter of the postposition carbon-coating (3) be less than or
Equal to the internal diameter of the central tube (1).
4. composite filter element component according to claim 2, which is characterized in that further include:
First cover (4), first cover (4) connect with the first end of the central tube (1)；
Second cover (5), second cover (5) connect with the second end of the central tube (1).
5. composite filter element component according to claim 4, which is characterized in that first cover (4) includes water outlet
(8), the water outlet (8) is arranged at the center of first cover (4).
6. composite filter element component according to claim 4, which is characterized in that second cover (5) is sealing cover；Or
Second cover (5) includes water inlet (9), and the water inlet (9) is arranged at the center of second cover (5).
7. composite filter element component according to claim 2, which is characterized in that further include:
Second central tube (11), second central tube (11) are removably disposed in the first end of the central tube (1).
8. composite filter element component according to claim 1, which is characterized in that the postposition carbon-coating (3) is Flat carbon membranes, institute
State the outside that postposition carbon-coating (3) cover the central tube (1).
9. composite filter element component according to claim 1, which is characterized in that further include:
Front filter element layer (6), the front filter element layer (6) are covered on the outside of the reverse osmosis film layer (2).
10. a kind of water purification system, including the composite filter element component as described in claim 1~9 is any.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822117934.XU CN209428257U (en) | 2018-12-17 | 2018-12-17 | A kind of composite filter element component and water purification system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822117934.XU CN209428257U (en) | 2018-12-17 | 2018-12-17 | A kind of composite filter element component and water purification system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111661944A (en) * | 2020-06-15 | 2020-09-15 | 浙江艾波特环保科技股份有限公司 | Integrated filter element structure |
| WO2022183628A1 (en) * | 2021-03-02 | 2022-09-09 | 韩佳（上海）环保设备有限公司 | Pretreatment integrated spiral-wound ro membrane element and reverse osmosis filter element comprising same |
| KR20220124074A (en) * | 2021-03-02 | 2022-09-13 | 코텍 (상하이) 인바이런먼트 이큅먼트 컴퍼니 리미티드 | RO membrane element and reverse osmosis filter element thereof |
-
2018
- 2018-12-17 CN CN201822117934.XU patent/CN209428257U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111661944A (en) * | 2020-06-15 | 2020-09-15 | 浙江艾波特环保科技股份有限公司 | Integrated filter element structure |
| WO2022183628A1 (en) * | 2021-03-02 | 2022-09-09 | 韩佳（上海）环保设备有限公司 | Pretreatment integrated spiral-wound ro membrane element and reverse osmosis filter element comprising same |
| KR20220124074A (en) * | 2021-03-02 | 2022-09-13 | 코텍 (상하이) 인바이런먼트 이큅먼트 컴퍼니 리미티드 | RO membrane element and reverse osmosis filter element thereof |
| KR102781586B1 (en) | 2021-03-02 | 2025-03-17 | 코텍 (상하이) 인바이런먼트 이큅먼트 컴퍼니 리미티드 | Ro membrane element and reverse osmosis filter element thereof |
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