CN110102185B - High-flux reverse osmosis membrane assembly and reverse osmosis filter element structure - Google Patents

High-flux reverse osmosis membrane assembly and reverse osmosis filter element structure Download PDF

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Publication number
CN110102185B
CN110102185B CN201910437914.7A CN201910437914A CN110102185B CN 110102185 B CN110102185 B CN 110102185B CN 201910437914 A CN201910437914 A CN 201910437914A CN 110102185 B CN110102185 B CN 110102185B
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CN
China
Prior art keywords
reverse osmosis
osmosis membrane
water
end cover
connecting end
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CN201910437914.7A
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Chinese (zh)
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CN110102185A (en
Inventor
顾逞涛
江坚敏
苏聪浩
胡金华
吴亮
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Ningbo Hidrotek Co Ltd
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Ningbo Hidrotek Co Ltd
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Priority to CN201910437914.7A priority Critical patent/CN110102185B/en
Publication of CN110102185A publication Critical patent/CN110102185A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D61/00Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/02Reverse osmosis; Hyperfiltration ; Nanofiltration
    • B01D61/025Reverse osmosis; Hyperfiltration
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D61/00Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/02Reverse osmosis; Hyperfiltration ; Nanofiltration
    • B01D61/08Apparatus therefor
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D63/00Apparatus in general for separation processes using semi-permeable membranes
    • B01D63/06Tubular membrane modules
    • B01D63/062Tubular membrane modules with membranes on a surface of a support tube
    • B01D63/065Tubular membrane modules with membranes on a surface of a support tube on the outer surface thereof
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D65/00Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
    • B01D65/08Prevention of membrane fouling or of concentration polarisation
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/44Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/441Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2321/00Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
    • B01D2321/16Use of chemical agents
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00Apparatus for treatment of water, waste water or sewage
    • C02F2201/002Construction details of the apparatus
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00Apparatus for treatment of water, waste water or sewage
    • C02F2201/002Construction details of the apparatus
    • C02F2201/004Seals, connections
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00Specific treatment goals
    • C02F2303/14Maintenance of water treatment installations
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00Specific treatment goals
    • C02F2303/22Eliminating or preventing deposits, scale removal, scale prevention

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Nanotechnology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Organic Chemistry (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

The invention discloses a high-flux reverse osmosis membrane assembly and a reverse osmosis filter element structure, wherein the high-flux reverse osmosis membrane assembly comprises a central tube and a reverse osmosis membrane body wound on the central tube, a raw water channel is arranged at the upper part of the central tube, a water purifying channel is arranged at the lower part of the central tube, the raw water channel and the water purifying channel are mutually independent through a baffle plate arranged in the central tube, a connecting end cover is sleeved on the central tube, the connecting end cover is fixed at the upper end of the reverse osmosis membrane body through a sealing and fixing device, a circumferentially distributed mounting groove is formed in the outer side wall of the connecting end cover, and an O-shaped ring is fixed in the mounting groove; its advantages are high flux and water yield and long service life.

Description

High-flux reverse osmosis membrane assembly and reverse osmosis filter element structure
Technical Field
The invention relates to the technical field of water treatment, in particular to a high-flux reverse osmosis membrane assembly and a reverse osmosis filter element structure.
Background
Along with the improvement of the water quality requirement of people on drinking water, a pure water system gradually enters a drinking water system of a household. The water purifier in the current market generally adopts a reverse osmosis filter core structure, and the filter core can filter organic matters, colloid, bacteria, viruses and other impurities in raw water, and particularly has extremely high filtering efficiency on inorganic salts, heavy metal ions and other impurities. Therefore, the reverse osmosis filter element forms a core component of the water purifier, the filtering effect of the water purifier is directly related to the filtering effect of the reverse osmosis filter element, and the filtering effect of the reverse osmosis filter element is greatly dependent on the reverse osmosis membrane.
The Chinese patent with the bulletin number of CN206950999U discloses a novel reverse osmosis membrane filter core, which comprises a housin, the inside reverse osmosis membrane that is provided with of casing, reverse osmosis membrane middle part runs through and is provided with the collector pipe, the upper end of collector pipe is confined, be equipped with the catchment hole on the collector pipe lateral wall, casing bottom center is equipped with the pure water export, pure water export and collector pipe lower extreme intercommunication, the cover is equipped with the water-stop ring on the outer wall of reverse osmosis membrane upper end, the device can effectively avoid salt to accumulate, can prolong reverse osmosis membrane life, improve the rate of permeating water.
There is also chinese patent publication No. CN206168235U which discloses a novel RO reverse osmosis membrane element, comprising a central tube and a filter layer, wherein the filter layer is wound on the central tube, the filter layer is sleeved with a rubber sleeve, the rubber sleeve is provided with an outwardly protruding water stop ring, and the water stop ring and the rubber sleeve are integrally manufactured. The device adopts rubber sleeve and integrative stagnant water circle of making to make the structure simpler, reduces the equipment process, and the rubber sleeve can closely laminate with the filtering layer has improved the leakproofness.
However, the above application uses a mode of sleeving a water stop ring on a reverse osmosis membrane to isolate raw water from purified water, so that interference is avoided, and the following problems exist: in order to smoothly install the reverse osmosis membrane with the water stop ring into the shell, a gap is usually reserved between the shell and the reverse osmosis membrane, and the size of the inner diameter of the shell is basically fixed because the shell belongs to a standard component, so that the further increase of the effective diameter of the reverse osmosis membrane is limited, the flux of the reverse osmosis membrane is not large, and the water yield and the service life of the reverse osmosis membrane are all required to be improved.
Disclosure of Invention
One of the main purposes of the invention is to provide a high flux reverse osmosis membrane module with larger flux, higher water yield and longer service life.
In order to achieve the above purpose, the invention adopts the following technical scheme: the utility model provides a high flux reverse osmosis membrane subassembly, includes the center tube and twines the reverse osmosis membrane body that sets up on the center tube, the upper portion of center tube have a raw water channel, the lower part of center tube have a water purification passageway, raw water channel with the water purification passageway through setting up the baffle in the center tube mutually independent, the center tube on the cover be equipped with the connection end cover, the connection end cover fix through sealed fixing device the upper end of reverse osmosis membrane body, just the lateral wall of connection end cover on seted up the mounting groove of circumference distribution, the mounting groove in-fixing have O type circle.
The side wall of the central tube is provided with a water outlet communicated with the raw water channel, a cavity which is downwards opened is arranged in the connecting end cover, a plurality of water seepage holes communicated with the cavity are formed in the upper surface of the connecting end cover, a pipe sleeve is further fixed in the center of the connecting end cover, the central tube is sleeved with the pipe sleeve, the inner side wall of the pipe sleeve is provided with a water flowing groove from top to bottom, the water flowing groove corresponds to the water outlet, and a water outlet gap is formed between the water flowing groove and the central tube. In this structure, the raw water of unpurified water flow to the raw water channel of center tube at first, then flow to the water launder from the apopore of center tube again, pipe box and center tube adopt interference fit's mode, therefore the water of water launder can only from bottom to top move, flow to in the cavity after the infiltration hole on the link cover, flow to reverse osmosis membrane body at last.
The scale inhibitor is arranged in the cavity. In the structure, the scale inhibitor can filter calcium and magnesium ions in raw water, so that the content of the calcium and magnesium ions in the raw water is reduced, the hardness of the raw water is reduced, the damage to a reverse osmosis membrane is reduced, and the service life of the reverse osmosis membrane is prolonged; the scale inhibitor is made of nano citric acid scale inhibition slow release material, so that the aims of corrosion prevention and scale prevention can be achieved, and the protection effect is better.
The pipe sleeve and the central pipe between be provided with positioning mechanism, positioning mechanism include the setting be in the elastic bulge of pipe sleeve inside wall with set up the recess of central pipe lateral wall constitute, the elastic bulge be located the recess. In this structure, be provided with positioning mechanism between pipe box and center tube, on the one hand convenient assembly, on the other hand can prevent to take place the dislocation between center tube and the pipe box for the apopore corresponds the water flow channel all the time, thereby does not influence out the water effect, and wherein, positioning mechanism adopts elastic bulge and sunken complex mode, simple structure and firm.
And a sealing and fixing device is arranged between the connecting end cover and the reverse osmosis membrane body. In this structure, sealing fixing device's setting can make to connect the end cover and be connected more reliably with reverse osmosis membrane body, in addition, plays the purpose of second grade stagnant water, can effectively prevent that water from oozing between end cover and the reverse osmosis membrane body.
The sealing fixing device comprises a sealing belt which is wound between the connecting end cover and the reverse osmosis membrane body. In this structure, the sealing strip is prior art, can play fixed connection end cover and reverse osmosis membrane body's purpose, can prevent infiltration again, and the cost is lower.
The sealing fixing device comprises a baffle ring fixed at the bottom of the connecting end cover and a containing groove arranged on the upper surface of the reverse osmosis membrane body, wherein the baffle ring is embedded in the containing groove, and sealing glue is arranged between the baffle ring and the containing groove. In this structure, keep off the ring downwardly extending setting, it cooperatees with the storage tank, has made things convenient for the installation on the one hand, on the other hand can prevent that water from oozing between connecting end cover and the reverse osmosis membrane body, keeps off the ring and bonds in the storage tank through the sealant, and the water tightness is stronger, and the outside need not to install extra sealing strip, can further increase the effective diameter of reverse osmosis membrane body, makes it press close to the casing as far as possible.
The invention also provides a reverse osmosis filter element structure, which comprises a shell, a water inlet shell cover and a high-flux reverse osmosis membrane component, wherein the water inlet shell cover is sealed and fixed with the shell, the high-flux reverse osmosis membrane component is arranged in the shell, and an O-shaped ring in the high-flux reverse osmosis membrane component is tightly contacted with the inner side wall of the shell. In this structure, O type circle and casing inside wall in close contact with can prevent raw water direct outflow not purified, O type circle is not direct with reverse osmosis membrane body coupling simultaneously to can make full use of reverse osmosis membrane body and the space between the casing, make reverse osmosis membrane body effective diameter can further increase, improve the filter effect.
The water inlet shell cover on be provided with the inlet tube, the bottom of casing be provided with the drain pipe, the inlet tube with raw water channel be linked together, the drain pipe with the water purification passageway be linked together. Raw water entering from the water inlet pipe passes through the raw water channel and then passes through the filtering action of the reverse osmosis membrane, enters into the water purifying channel from the opening on the side wall of the lower part of the central pipe, and finally is discharged by the water discharging pipe to form a complete waterway flow direction, so that water pollution is avoided, and the purifying effect is good.
The bottom of the shell is also provided with a waste pipe. The waste water pipe is used for discharging waste water which is not purified by the reverse osmosis membrane.
The water inlet shell cover is in threaded connection with the shell, and a sealing ring is arranged between the water inlet shell cover and the shell. In this structure, adopt threaded connection's mode, the dismouting is comparatively convenient on the one hand, and on the other hand is sealed effectual, and the leakproofness between inlet cap and the casing has then further been strengthened in the setting of sealing washer.
Compared with the prior art, the invention has the advantages that: the O-shaped ring is used for contacting with the shell to realize the purpose of radial sealing, compared with the traditional water stop ring, the volume is smaller, and the O-shaped ring is not directly arranged on the reverse osmosis membrane body but arranged on the connecting end cover, so that the effective diameter of the reverse osmosis membrane body can be enlarged and is as close to the inner diameter of the shell as possible, thereby effectively utilizing the space of the shell, increasing the flux of the reverse osmosis membrane, and improving the water yield and the service life; the sealing and fixing device can ensure that the connection end cover is connected with the reverse osmosis membrane body more reliably, and in addition, the purpose of secondary water stopping is achieved, and water can be effectively prevented from seeping out from between the connection end cover and the reverse osmosis membrane body; the invention has the advantages of larger flux, higher water yield and longer service life.
Drawings
FIG. 1 is a schematic perspective view of a first embodiment of the present invention;
FIG. 2 is a cross-sectional view of a first embodiment of the invention;
FIG. 3 is an enlarged partial schematic view of the present invention at A in FIG. 2;
FIG. 4 is a schematic perspective view of a connecting end cap according to a first embodiment of the present invention;
FIG. 5 is a schematic perspective view showing an exploded state according to an embodiment of the present invention;
FIG. 6 is a cross-sectional view of a second embodiment of the invention;
FIG. 7 is an enlarged partial schematic view of the present invention at B in FIG. 6;
FIG. 8 is a schematic perspective view of a connecting end cap according to a second embodiment of the present invention;
Fig. 9 is a schematic perspective view of a third embodiment of the present invention;
FIG. 10 is a cross-sectional view of a fourth embodiment of the invention;
FIG. 11 is an enlarged partial schematic view of the present invention at C in FIG. 10;
FIG. 12 is a schematic perspective view showing a fourth exploded state according to the embodiment of the present invention;
FIG. 13 is a partially enlarged schematic illustration of the present invention at D in FIG. 12;
fig. 14 is a schematic perspective view of a fifth embodiment of the present invention;
Fig. 15 is a cross-sectional view of a fifth embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the embodiments of the drawings.
Embodiment one: as shown in the figure, the high-flux reverse osmosis membrane assembly comprises a central tube 1 and a reverse osmosis membrane body 2 wound on the central tube 1, wherein a raw water channel 11 is arranged on the upper portion of the central tube 1, a water purifying channel 12 is arranged on the lower portion of the central tube 1, the raw water channel 11 and the water purifying channel 12 are mutually independent through a baffle plate 13 arranged in the central tube 1, a connecting end cover 3 is sleeved on the central tube 1, the connecting end cover 3 is fixed at the upper end of the reverse osmosis membrane body 2 through a sealing and fixing device 4, a circumferentially distributed mounting groove 31 is formed in the outer side wall of the connecting end cover 3, and an O-shaped ring 32 is fixed in the mounting groove 31.
In this embodiment, the sidewall of the central tube 1 is provided with a water outlet hole 14 communicating with the raw water channel 11, a cavity 33 with a downward opening is provided in the connection end cover 3, a plurality of water seepage holes 34 communicating with the cavity 33 are provided on the upper surface of the connection end cover 3, a tube sleeve 35 is further fixed at the center of the connection end cover 3, the tube sleeve 35 is sleeved on the central tube 1, the inner sidewall of the tube sleeve 35 is provided with a water flowing groove 36 from top to bottom, the water flowing groove 36 corresponds to the water outlet hole 14, and a water outlet gap is formed between the water flowing groove 36 and the central tube 1.
In this embodiment, the scale inhibitor 37 is disposed in the cavity 33.
Embodiment two: as shown in the figure, other structures are the same as those of the first embodiment, except that a positioning mechanism 5 is provided between the sleeve 35 and the central tube 1, and the positioning mechanism 5 includes an elastic protrusion 51 provided on the inner side wall of the sleeve 35 and a recess 52 provided on the outer side wall of the central tube 1, where the elastic protrusion 51 is located in the recess 52.
Embodiment III: as shown in the drawings, other structures are the same as the embodiments except that the seal fixture 4 includes a seal tape 41, and the seal tape 41 is wound between the connection end cap 3 and the reverse osmosis membrane body 2.
Embodiment four: as shown in the figure, other structures are the same as those of the embodiment, and the difference is that the sealing and fixing device 4 includes a baffle ring 42 fixed at the bottom of the connection end cover 3 and a containing groove 43 disposed on the upper surface of the reverse osmosis membrane body 2, the baffle ring 42 is embedded in the containing groove 43, and a sealant is disposed between the baffle ring 42 and the containing groove 43.
In this embodiment, a sealing tape is further adhered between the connection end cover 3 and the reverse osmosis membrane body 2, so as to further improve water tightness.
Fifth embodiment: as shown in the figure, the reverse osmosis filter element structure comprises a shell 6 and a water inlet shell cover 7 which is fixed with the shell 6 in a sealing way, and further comprises a high-flux reverse osmosis membrane component as in the fourth embodiment, wherein the high-flux reverse osmosis membrane component is arranged in the shell 6, and an O-shaped ring 32 in the high-flux reverse osmosis membrane component is tightly contacted with the inner side wall of the shell 6.
In this embodiment, the water inlet pipe 71 is provided on the water inlet cover 7, the water outlet pipe 61 is provided at the bottom of the housing 6, the water inlet pipe 71 is communicated with the raw water channel 11, and the water outlet pipe 61 is communicated with the purified water channel 12.
In this embodiment, the bottom of the housing 6 is also provided with a waste pipe 62.
In this embodiment, the water inlet cover 7 is in threaded connection with the housing 6, and a sealing ring 72 is disposed between the water inlet cover 7 and the housing 6.

Claims (6)

1. The utility model provides a high flux reverse osmosis membrane subassembly, includes the center tube and twines the reverse osmosis membrane body that sets up on the center tube, the upper portion of center tube have a raw water channel, the lower part of center tube have a water purification passageway, raw water channel with the water purification passageway pass through the baffle that sets up in the center tube mutually independent, its characterized in that: the connecting end cover is fixed at the upper end of the reverse osmosis membrane body through a sealing and fixing device, mounting grooves distributed circumferentially are formed in the outer side wall of the connecting end cover, and O-shaped rings are fixed in the mounting grooves;
The water outlet is formed in the side wall of the central pipe and is communicated with the raw water channel, a cavity which is opened downwards is formed in the connecting end cover, a plurality of water seepage holes communicated with the cavity are formed in the upper surface of the connecting end cover, a pipe sleeve is further fixed in the center of the connecting end cover, the pipe sleeve is sleeved on the central pipe, a water flowing groove from top to bottom is formed in the inner side wall of the pipe sleeve, and the water flowing groove corresponds to the water outlet, so that a water outlet gap is formed between the water flowing groove and the central pipe;
a scale inhibitor is placed in the cavity;
A positioning mechanism is arranged between the pipe sleeve and the central pipe, the positioning mechanism comprises an elastic bulge arranged on the inner side wall of the pipe sleeve and a concave arranged on the outer side wall of the central pipe, and the elastic bulge is positioned in the concave;
The sealing fixing device comprises a baffle ring fixed at the bottom of the connecting end cover and a containing groove arranged on the upper surface of the reverse osmosis membrane body, wherein the baffle ring is embedded in the containing groove, and sealing glue is arranged between the baffle ring and the containing groove.
2. The high flux reverse osmosis membrane module of claim 1, wherein: the sealing fixing device comprises a sealing belt which is wound between the connecting end cover and the reverse osmosis membrane body.
3. The utility model provides a reverse osmosis filter core structure, includes the casing and with casing seal fixed's inlet cap, its characterized in that: a high flux reverse osmosis membrane module as claimed in any one of claims 1 to 2, said high flux reverse osmosis membrane module being mounted within said housing, said high flux reverse osmosis membrane module having O-rings in close contact with the inner side wall of said housing.
4. A reverse osmosis cartridge structure according to claim 3, characterized in that: the water inlet shell cover on be provided with the inlet tube, the bottom of casing be provided with the drain pipe, the inlet tube with raw water channel be linked together, the drain pipe with the water purification passageway be linked together.
5. A reverse osmosis cartridge structure according to claim 4, wherein: the bottom of the shell is also provided with a waste pipe.
6. A reverse osmosis cartridge structure according to claim 3, characterized in that: the water inlet shell cover is in threaded connection with the shell, and a sealing ring is arranged between the water inlet shell cover and the shell.
CN201910437914.7A 2019-05-24 2019-05-24 High-flux reverse osmosis membrane assembly and reverse osmosis filter element structure Active CN110102185B (en)

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CN110102185B true CN110102185B (en) 2024-05-24

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110721590A (en) * 2019-10-24 2020-01-24 江门联福广科新材料科技有限公司 RO membrane filter

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CN201643864U (en) * 2010-04-02 2010-11-24 艾欧史密斯(上海)水处理产品有限公司 Shell of reverse osmosis filter
CN206156806U (en) * 2016-10-26 2017-05-10 佛山市美的清湖净水设备有限公司 Filter element and water purification equipment
CN206508818U (en) * 2017-01-12 2017-09-22 浙江沁园水处理科技有限公司 Reverse osmosis membrane filter element component and the water purifier with reverse osmosis membrane filter element component
CN208642335U (en) * 2018-07-11 2019-03-26 开源环保科技(上海)有限公司 A kind of RO reverse osmosis filter
CN210332296U (en) * 2019-05-24 2020-04-17 宁波灏钻科技有限公司 High-flux reverse osmosis membrane module and reverse osmosis filter element structure

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US7267769B2 (en) * 2004-09-24 2007-09-11 International Environmental Technologies, Llc Water purification system utilizing a carbon block pre-filter

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201643864U (en) * 2010-04-02 2010-11-24 艾欧史密斯(上海)水处理产品有限公司 Shell of reverse osmosis filter
CN206156806U (en) * 2016-10-26 2017-05-10 佛山市美的清湖净水设备有限公司 Filter element and water purification equipment
CN206508818U (en) * 2017-01-12 2017-09-22 浙江沁园水处理科技有限公司 Reverse osmosis membrane filter element component and the water purifier with reverse osmosis membrane filter element component
CN208642335U (en) * 2018-07-11 2019-03-26 开源环保科技(上海)有限公司 A kind of RO reverse osmosis filter
CN210332296U (en) * 2019-05-24 2020-04-17 宁波灏钻科技有限公司 High-flux reverse osmosis membrane module and reverse osmosis filter element structure

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