CN208512284U - A kind of reverse-osmosis membrane element and the purifier with it - Google Patents

Abstract

The utility model is originally related to field of water treatment equipment, more particularly to a kind of reverse-osmosis membrane element and the purifier with it, wherein, reverse-osmosis membrane element includes central tube and rolls in the reverse osmosis membrane assembly on central tube, reverse osmosis membrane assembly includes that a pair of front that passes through overlaps and rolled together in the reverse osmosis membrane on central tube, water inlet flow channel has the water inlet for being formed in two reverse osmosis membrane coxopleure edges and the water outlet for being formed in two reverse osmosis membrane epimeron edges, reverse osmosis membrane assembly further includes the water-stop structure being set in water inlet flow channel, water-stop structure includes the first water proof band in two reverse osmosis membranes under unfolded state with central, tubular at a default angle, the second flow channel that first water proof band is separated into water inlet flow channel the gradually smaller first runner in cross section and is connected with first runner.The utility model structure is simple, can extend the service life of reverse-osmosis membrane element.

Description

A kind of reverse-osmosis membrane element and the purifier with it

Technical field

It is set the utility model relates to field of water treatment equipment more particularly to a kind of reverse-osmosis membrane element and with its water purification It is standby.

Background technique

Currently, the raw water of most popular reverse-osmosis membrane element is flowed into from one end, flowed along parallel central tube direction, only Water enters in the film bag of reverse osmosis membrane, flows into central tube by the through-hole on central tube, is discharged from the water purification outlet of central tube, not By the parallel central tube direction of the concentrated water of reverse osmosis membrane, discharge is exported from the concentrated water around central tube.In this manner, raw water It is flowed along reverse osmosis membrane assembly central tube parallel direction, the time of contact of raw water and reverse osmosis membrane is shorter.Due to this mode The runner of the reverse osmosis membrane assembly water rolled is wide, so water is slow in the flow velocity of film surface, film surface forms concentration polarization, and consequence is just It is that film surface is caused to be easy fouling.In addition, raw water constantly penetrates into film bag along raw water flow direction, the concentration of water (contains Salt amount) it is higher and higher, the salinity closer to the film surface water of concentrated water outlet end is higher, and solute is precipitated fouling in film surface and also gets over Seriously, shorten the service life of reverse osmosis membrane.

China Patent Publication No. CN102976447 discloses a kind of lateral flow type reverse-osmosis membrane element, in reverse-osmosis membrane element Flow-guiding screen and reverse osmosis membrane between be coated with adhesive waterproof tape, as shown in Figure 1, the flow-guiding screen 20 ' of unfolded state be in rectangle, one end It is connected with central tube 21 '.What central tube 21 ' was located at flow-guiding screen rolls starting point, and rolling direction is in Fig. 1 shown in arrow 24 ' Direction.The one group opposite side parallel with direction is rolled while 22 ' and while 23 ', be coated with adhesive waterproof tape (as shown in heavy black).Side 22 ' It is coated with adhesive waterproof tape 231 ' to end, a part on side 23 ' is rolled from starting point is rolled, is not coated with a part 232 ' of adhesive waterproof tape Water outlet as the reverse-osmosis membrane element for rolling and completing to obtain after subsequent normal process steps.In Fig. 2, water inlet 32 ' is right A part 232 ' for being not coated with adhesive waterproof tape in Fig. 2 should be corresponded in the side 25 ' in Fig. 1, water outlet 31 '.In Fig. 3, enter water Mouth 42 ' corresponds to a part 232 ' for being not coated with adhesive waterproof tape in Fig. 1, and water outlet 41 ' corresponds to side 25 '.In this way, former Water is moved along the length direction of reverse osmosis membrane, and opposite side is intake the mode of other end water outlet, is increased and reverse osmosis membrane The unilateral contact area of piece, to improve the filter efficiency of reverse osmosis membrane, increase reverse-osmosis membrane element pure water recovery rate and Water flux；But there is certain " dead angle " region 26 ' i.e. shown in FIG. 1, region membrane surface mobility drop in this mode Low, the utilization rate of diaphragm reduces, and reduces diaphragm efficiency, although adhesive waterproof tape 27 ' is increased at region 26 ' in the prior art, But effect is limited, and reverse-osmosis membrane element still has the above problem.

Utility model content

The purpose of this utility model is to provide a kind of reverse-osmosis membrane elements, it is intended to solve to improve making for reverse-osmosis membrane element The problem of with the service life.

The utility model is realized in this way a kind of reverse-osmosis membrane element, for raw water to be concentrated to generate pure water, including from It the central tube that extends after going to and rolls with turning left in the reverse osmosis membrane on the central tube outer tube wall from left to right or from the right side Component, the central tube open up the inlet opening for being connected to its inner pipe passway in its outer tube wall, and the reverse osmosis membrane assembly includes one To by front overlapping and roll between the reverse osmosis membrane on the central tube, the front of two reverse osmosis membranes together Water inlet flow channel is collectively formed, pure water runner is collectively formed between the reverse side of two reverse osmosis membranes, the water inlet flow channel has It is formed in the water inlet on two reverse osmosis membrane coxopleure edges and is formed in going out for two reverse osmosis membrane epimeron edges The mouth of a river, the reverse osmosis membrane assembly further include the water-stop structure being set in the water inlet flow channel, and the water-stop structure is for making The raw water is greater than between the water inlet and the water outlet described anti-two in the path flowed through in the water inlet flow channel Permeate linear distance of the diaphragm under unfolded state.The water-stop structure is included in two reverse osmosis membranes under unfolded state With the central, tubular at the first water proof band of a default angle, the first water proof band is separated into the water inlet flow channel transversal Second flow channel face gradually smaller first runner and be connected with the first runner.

Further, the angular range of the default angle is greater than zero degree and less than 90 degree.

Further, the water-stop structure further includes being set to the coxopleure edge of two reverse osmosis membranes and for sealing Second water proof band of the first runner is set to the epimeron of the reverse osmosis membrane along for sealing the second flow channel Third water proof band and it is set to the reverse osmosis membrane surrounding and for sealing the 4th water proof band of the pure water runner.

Further, the first water proof band is staggered with the third water proof band and further includes close to described reverse osmosis The first end on diaphragm epimeron edge and the second end on close reverse osmosis membrane coxopleure edge；The first end and described Two ends are in tilted layout in the opposite direction.

Further, the first end is obliquely installed towards the central tube, and the second end is towards away from the central tube Direction is obliquely installed, and the first runner is connected at the second end far from the central tube with the second flow channel.

Further, the water inlet is between the second water proof band and the central tube, the second water proof band The water supplement port that raw water is supplemented into first runner is provided between with the right side piece of the reverse osmosis membrane；The water outlet packet It includes between the first end and the central tube and flows out the first water outlet of the first runner for concentrated water, positioned at described The second water outlet of the second flow channel is flowed out between first end and the third water proof band and for the concentrated water and is located at institute The third between third water proof band and the right side piece edge of the reverse osmosis membrane and flowing out the second flow channel for concentrated water is stated to be discharged Mouthful.

Further, the second end is obliquely installed towards the central tube, and the first end is towards away from the central tube Direction is obliquely installed, and the first runner is connected to the second flow channel at the second end of the central tube.

Further, the water inlet is located between the second water proof band and the right side piece edge of the reverse osmosis membrane, The water supplement port that raw water is supplemented into first runner is provided between the second water proof band and the central tube；The water outlet packet It includes positioned at the right side piece of the first end and the reverse osmosis membrane between and flows out the first of the first runner for concentrated water Water outlet, the second water outlet that the second flow channel is flowed out between the first end and the third water proof and for the concentrated water Mouth and the third water outlet that the second flow channel is flowed out between the third water proof band and the central tube and for concentrated water.

Further, the reverse-osmosis membrane element further includes being arranged in the water inlet flow channel and for guiding the raw water The water inlet flow-guiding screen of flowing and the pure water flow-guiding screen for being arranged in the pure water runner and be used to guide the pure water flowing；Institute State the first water proof band, the second water proof band and the third water proof band in pairs and be respectively arranged at the water inlet flow-guiding screen Two sides wire side, the 4th water proof band in pairs and is respectively arranged at the two sides wire side of the pure water flow-guiding screen.

The utility model compared with the existing technology have the technical effect that the water inlet flow channel is separated by the first water proof band One runner and second flow channel, raw water not only extend raw water in two reverse osmosis membranes followed by first runner and second flow channel Between flow through distance, improve the utilization rate of reverse osmosis membrane, and first runner and second flow channel are along the side that raw water flows Constantly become smaller to cross-sectional area, so that flow velocity of the raw water in first runner and second flow channel constantly increases, alleviates pole Changing boundary layer bring motive force reduces problem, realizes raw water almost constant speed flowing, eliminates laminar flow of the raw water in runner Phenomenon realizes full turbulent flow, is conducive to the pollutant for washing away reverse osmosis membrane surface, reduces the blocking of pollutant, extend reverse osmosis The service life of permeable membrane piece.

Detailed description of the invention

Fig. 1 is the structural schematic diagram of reverse-osmosis membrane element in the prior art.

Fig. 2 is the one of Fig. 1 to roll structural schematic diagram under state.

Fig. 3 is another structural schematic diagram rolled under state of Fig. 1.

Fig. 4 is the structural schematic diagram of reverse-osmosis membrane element provided by the utility model embodiment.

Fig. 5 is structural schematic diagram of the reverse osmosis membrane assembly of Fig. 4 under unfolded state.

Fig. 6 is another structural schematic diagram of the reverse osmosis membrane assembly of Fig. 4 under unfolded state.

Fig. 7 is the water-stop structure of Fig. 4 and the integrally formed structural schematic diagram of water inlet flow-guiding screen.

Numbering in the drawing relationship corresponding with title is as follows:

Specific embodiment

The embodiments of the present invention are described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning Same or similar element or element with the same or similar functions are indicated to same or similar label eventually.Below by ginseng The embodiment for examining attached drawing description is exemplary, it is intended to for explaining the utility model, and should not be understood as to the utility model Limitation.

In the description of the present invention, it should be understood that term " thickness ", "upper", "lower", " vertical ", " parallel ", The orientation or positional relationship of the instructions such as "bottom", " angle " is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of retouching State the utility model and simplify description, rather than the device or element of indication or suggestion meaning must have a particular orientation, with Specific orientation construction and operation, therefore should not be understood as limiting the present invention.

In the present invention unless specifically defined or limited otherwise, the terms such as term " installation ", " connection " should be done extensively Reason and good sense solution may be a detachable connection for example, it may be being fixedly connected, or integral；It can be mechanical connection, it can also be with It is electrical connection；Can be directly connected, can also indirectly connected through an intermediary, can be connection inside two elements or The interaction relationship of two elements.

Fig. 4 to fig. 6 is please referred to, reverse-osmosis membrane element 100 provided by the utility model embodiment is mounted on purifier For raw water to be concentrated to generate pure water in (figure is not drawn).The reverse-osmosis membrane element 100 includes the central tube extended from front to back 101 and from left to right or from the reverse osmosis membrane assembly 113 turned left on the central tube 101 of the right side.It is anti-in the present embodiment Permeable membrane element 113 is rolled from left to right on central tube 101.Multiple connection centers are offered on the outer tube wall of central tube 101 The inlet opening 102 of 101 interior conduit of pipe and the reverse osmosis membrane assembly 113.The pure water flows into described from the inlet opening 102 The front end of the interior conduit of heart pipe 101 and the pure water pipe 101 centered on the flow direction in central tube 101 is to central tube 101 Rear end.

The reverse osmosis membrane assembly 113 include with the central tube 101 winding made of two panels reverse osmosis membrane 112 and Water-stop structure (not shown) between two reverse osmosis membranes 112 is set.Two reverse osmosis membranes 112 are stacked and together It rolls on the central tube 101.Each reverse osmosis membrane 112 includes obverse and reverse, the front of two reverse osmosis membranes 112 The side of opposite fitting setting and the parallel central tube 101, which connects the central tube 101 and formed, rolls beginning (not shown), The opposite other side, which is tightly connected and is formed, rolls end 107.In other embodiments, rolling beginning, to be also possible to one reverse osmosis Diaphragm 112 is from positive doubling and connect and is formed with central tube 101, and fold position then forms and rolls end 107.

Water inlet flow channel 115 is formed between the front interlayer of two reverse osmosis membranes 112, forms pure water runner between reverse side interlayer (figure is not drawn).Raw water or concentrated water flow through water inlet flow channel 115 can just being permeated towards reverse side from reverse osmosis membrane 112, and cannot It is permeated from the reverse side of reverse osmosis membrane 112 to front, i.e., the raw water in water inlet flow channel 115 can infiltrate into pure water runner to obtain Pure water, and the pure water obtained in pure water runner cannot be reverse osmosis in water inlet flow channel 115.Inlet opening 102 on central tube 101 It is connected with the pure water runner, the pure water obtained in pure water runner flows into the tube body of central tube 101 simultaneously through inlet opening 102 It is flowed out from the rear end of central tube 101.

The reverse-osmosis membrane element 100 further includes the water inlet for being separately positioned on 112 liang of lateral plate edges of reverse osmosis membrane 109 and water outlet (not shown).Wherein, the water inlet 109 is set to the coxopleure edge of two reverse osmosis membranes 112 and for raw water Flow into water inlet flow channel 115；The water outlet is set to the epimeron edge of two reverse osmosis membranes 112 and flows out the water inlet for concentrated water Runner 115.

The path that the water-stop structure is used to that the raw water to be made to be flowed through in the water inlet flow channel 115 is greater than the water inlet Linear distance between mouth 109 and the water outlet in two reverse osmosis membranes 112 under unfolded state.The water-stop structure Including be arranged in the water inlet flow channel 115 and two reverse osmosis membranes 112 under unfolded state with 101 shape of central tube At the first water proof band 105 of a default angle.The angular range of the default angle is greater than zero degree and less than 90 degree.It is described First water proof band 105 is separated into the water inlet flow channel 115 along the direction of raw water flowing in the water inlet flow channel 115 first-class Road 1151 and the second flow channel 1152 being connected with the first runner 1151.The first runner 1151 and the second flow channel 1152 constantly reduce along the direction cross section of raw water flowing.

The water inlet flow channel 115 is separated into first runner 1151 and second flow channel 1152 by the first water proof band 105, raw water according to It is secondary to flow through first runner 1151 and second flow channel 1152, not only extend raw water between two reverse osmosis membranes 112 flow through away from From improving the utilization rate of reverse osmosis membrane 112, and first runner 1151 and second flow channel 1152 are along the direction that raw water flows Cross-sectional area constantly becomes smaller, so that flow velocity of the raw water in first runner 1151 and second flow channel 1152 constantly increases, subtracts Light polarization boundary layer bring motive force reduces problem, realizes raw water almost constant speed flowing, eliminates raw water in runner Laminar flow phenomenon, realize full turbulent flow, be conducive to the pollutant for washing away 112 surface of reverse osmosis membrane, reduce the blocking of pollutant, prolong The service life of reverse osmosis membrane 112 is grown.

The first water proof band 105 includes close to the first end 1051 on 112 epimeron edge of reverse osmosis membrane and close to anti- Permeate the second end 1052 on 112 coxopleure edge of diaphragm.The water-stop structure further include be set to the front side of two reverse osmosis membrane 112 and For sealing the second water proof band 108 of first runner 1151, being set to two reverse osmosis membranes, 112 rear side and for sealing second The third water proof band 104 in road 1152 and it is set to 112 periphery of reverse osmosis membrane and for sealing the stream of pure water The 4th water proof band (figure is not drawn) in road.First is not fully sealed in the front side of two reverse osmosis membranes 112 for the second water proof band 108 Second flow channel 1152 is not fully sealed in the rear side of two reverse osmosis membranes 112 for runner 1151, third water proof band 104.

The water outlet includes the first water outlet 110, the second water outlet 103 and third water outlet 111.It is described reverse osmosis Membrane module 113 further includes the water supplement port 112 that 112 coxopleure edge of reverse osmosis membrane is arranged in.

Referring to Fig. 5, in one embodiment, the first end 1051 of the first water proof band 105 rolls the beginning to the left and towards described End is obliquely installed, and second end 1052 is obliquely installed towards rolling end 107 to the right.The first runner 1151 and the second flow channel 1152 are connected at second end 1052, and first end 1051 is close to the rear end of central tube 101.Raw water in first runner 1151 from From left to right flows, and the raw water in second flow channel 1152 flows from right to left, as shown by the arrows in Figure 5.

The water inlet 109 is between the second water proof band 108 and central tube 101.The water supplement port 112 is located at institute It states the second water proof band 108 and rolls between end 107, the raw water can flow into first runner 1151 through the water supplement port 112. The width of the water inlet 109 accounts for reverse osmosis membrane 112 rolls length 10%~50%, and the width of the water supplement port 112 accounts for Reverse osmosis membrane 112 rolls the 0.1%~5% of length.Raw water flows into first runner 1151 through water supplement port 112, can eliminate the One runner 1151 is located at the dead angle at this, prevents the flowing " dead angle " of fluid, and pollutant is caused to sink at water supplement port 112 It forms sediment, improve the utilization rate of reverse osmosis membrane 112 and extends the service life of reverse osmosis membrane 112.

The water outlet includes the first water outlet 110 between the first end 1051 and the central tube 101, position The second water outlet 103 between third water proof band 104 and the first end 1051 and positioned at rolling end 107 and described the Third water outlet 111 between three water proof bands 104.Most of concentrated water flows out second flow channel 1152, small portion through the second water outlet 103 Concentrated water is divided to flow out second flow channel 1152 through the first water outlet 110 and the second water outlet 103.First water outlet 110 not only can be to prevent Only the fluid of first runner 1151 occurs flowing " dead angle " at this, and the first water proof band 105 is located at the first water outlet 110 Part tilted with respect to central tube 101 and form the runner of the continuous reduction in cross section so that fluid is flowing out the first water outlet 110 When, flow velocity constantly increases, to wash away the pollutant on 112 front of reverse osmosis membrane, improves the utilization of reverse osmosis membrane 112 Rate.Third water outlet 111 can eliminate the dead angle that second flow channel 1152 is located at this, prevent the flowing " dead angle " of fluid, And pollutant is caused to precipitate at third water outlet 111, improve the utilization rate of reverse osmosis membrane 112.

The width of first water outlet 110 accounts for roll length 0.1%~5% of the reverse osmosis membrane 112.It is described The width of second water outlet 103 accounts for reverse osmosis membrane 112 rolls length 10%~50%.The width of the third water outlet 111 Degree accounts for reverse osmosis membrane 112 rolls length 0.1%~5%.

Referring to Fig. 6, in another embodiment, the first end 1051 of the first water proof band 105 is to the right and court rolls end 107 are obliquely installed, and second end 1052 is obliquely installed towards rolling beginning to the left.The first runner 1151 and the runner are second It holds and is connected at 1052, second end 1052 is close to central tube 101.Raw water in first runner 1151 flows from right to left, and second Raw water in runner 1152 flows from left to right, as shown by the arrows in Figure 6.

The water inlet 109 be located at the second water proof band 108 and it is described roll between end 107, the water supplement port 112 Between the central tube 101 and the second water proof band 108.First water outlet 110 rolls end 107 described in being located at Between first end 1051, the second water outlet 103 is located between third water proof band 104 and first end 1051, third water outlet 111 Positioned at rolling between beginning and third water proof band 104.It equally can achieve and prevent fluid " dead angle ", wash away pollutant, mention The effect of the service life of high reverse osmosis membrane 112.

Referring to Fig. 7, the reverse osmosis membrane assembly 113 further includes being arranged in the water inlet flow channel 115 and for guiding The water inlet flow-guiding screen 106 and be arranged in the pure water runner and be used to guide pure water that raw water flows in water inlet flow channel 115 The pure water flow-guiding screen flowed in the pure water runner (figure is not drawn).

The first water proof band 105, the second water proof band 108 and the third water proof band 104 be arranged in pairs in The two sides wire side of the water inlet flow-guiding screen 106.Specifically, the two first water proof bands 105, the two second water proof bands 108 with And two the third water proof band 104 can by the way of thermoforming with the water inlet flow-guiding screen 106 be integrally formed and be set to The two sides of its wire side, then rolled with central tube 101.

4th water proof band is arranged in pairs in the two sides wire side of the pure water flow-guiding screen.Specifically, the 4th water proof band can be adopted The two sides of its wire side are integrally formed and be set to the mode of thermoforming and the pure water flow-guiding screen, then are carried out with central tube 101 It rolls.

Hot-forming mode has at low cost, simple process to generate water-stop structure.In other embodiments may be used Water-stop structure is generated in a manner of using gluing.

The end 107 that rolls is also coated with sealing so that reverse osmosis membrane 112 is preferably rolled on central tube 101.

The utility model embodiment additionally provides a kind of purifier (figure is not drawn), with reverse osmosis membrane as described above Element 100.After the purifier uses reverse-osmosis membrane element 100 as described above, in the test that NaCl concentration is 250ppm Under the test of liquid, purifier averagely through water (GPD) compared to the common RO filter core that specified production water flow is 75G can be with 90.1 are promoted to from 78.5；The common RO filter core that NaCl salt rejection rate (%) is 75G compared to specified production water flow, can mention from 97.8 Rise to 98.8.

The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this Made any modifications, equivalent replacements, and improvements etc., should be included in the utility model within the spirit and principle of utility model Protection scope within.

Claims (10)

1. a kind of reverse-osmosis membrane element, for raw water to be concentrated to generate pure water, it is characterised in that: in extending from front to back Heart pipe and from left to right or from the right side roll with turning left in the reverse osmosis membrane assembly on the central tube outer tube wall, the central tube Open up the inlet opening for being connected to its inner pipe passway in its outer tube wall, the reverse osmosis membrane assembly include it is a pair of by front overlapping and It rolls together and feed water flow is collectively formed between the reverse osmosis membrane on the central tube, the front of two reverse osmosis membranes Road, the water inlet flow channel have the water inlet for being formed in two reverse osmosis membrane coxopleure edges and are formed in two reverse osmosis The water outlet on permeable membrane piece epimeron edge, the reverse osmosis membrane assembly further include the water-stop structure being set in the water inlet flow channel, The water-stop structure be used for flow through the raw water in the water inlet flow channel path be greater than the water inlet and it is described go out Linear distance between the mouth of a river in two reverse osmosis membranes under unfolded state, the water-stop structure are included in two reverse osmosis Permeable membrane piece under unfolded state with the central, tubular at the first water proof band of a default angle, the first water proof band is described in The second flow channel that water inlet flow channel is separated into the gradually smaller first runner in cross section and is connected with the first runner.

2. reverse-osmosis membrane element as described in claim 1, it is characterised in that: the angular range of the default angle is greater than zero degree And less than 90 degree.

3. reverse-osmosis membrane element as described in claim 1, it is characterised in that: common between the reverse side of two reverse osmosis membranes Pure water runner is formed, the water-stop structure further includes being set to the coxopleure edge of two reverse osmosis membranes and being used to seal described Second water proof band of first runner is set to the epimeron of the reverse osmosis membrane along the third for sealing the second flow channel Water proof band and it is set to the reverse osmosis membrane surrounding and for sealing the 4th water proof band of the pure water runner.

4. reverse-osmosis membrane element as claimed in claim 3, it is characterised in that: the first water proof band and the third water proof band It is staggered and further includes close to the first end on reverse osmosis membrane epimeron edge and on front side of the reverse osmosis membrane The second end on piece edge；The first end and the second end are in tilted layout in the opposite direction.

5. reverse-osmosis membrane element as claimed in claim 4, it is characterised in that: the first end is set towards central tube inclination It sets, the second end is obliquely installed towards the direction away from the central tube, and the first runner is with the second flow channel in separate It is connected at the second end of the central tube.

6. reverse-osmosis membrane element as claimed in claim 5, it is characterised in that: the water inlet be located at the second water proof band with Between the central tube, the right side piece of the second water proof band and the reverse osmosis membrane is provided between into first runner Supplement the water supplement port of raw water；The water outlet includes between the first end and the central tube and for described in concentrated water outflow First water outlet of first runner, between the first end and the third water proof band and for concentrated water outflow described the Second water outlet of two runners and positioned at the right side piece of the third water proof band and the reverse osmosis membrane between and for dense Water flows out the third water outlet of the second flow channel.

7. reverse-osmosis membrane element as claimed in claim 4, it is characterised in that: the second end is set towards central tube inclination It sets, the first end is obliquely installed towards the direction away from the central tube, and the first runner is with the second flow channel in close It is connected at the second end of the central tube.

8. reverse-osmosis membrane element as claimed in claim 7, it is characterised in that: the water inlet be located at the second water proof band with The right side piece of the reverse osmosis membrane is provided between the second water proof band and the central tube into first runner between Supplement the water supplement port of raw water；The water outlet include positioned at the first end and the reverse osmosis membrane right side piece between and The first water outlet of the first runner is flowed out for concentrated water, between the first end and the third water proof and for described dense Water flows out the second water outlet of the second flow channel and between the third water proof band and the central tube and for concentrated water Flow out the third water outlet of the second flow channel.

9. the reverse-osmosis membrane element as described in claim 3-8 any one, it is characterised in that: the reverse-osmosis membrane element also wraps It includes and is arranged in the water inlet flow channel and for guiding the water inlet flow-guiding screen of the raw water flowing and being arranged in the stream of pure water Pure water flow-guiding screen in road and for guiding the pure water flowing；The first water proof band, the second water proof band and described Third water proof band is pairs of and is respectively arranged at the two sides wire side of the water inlet flow-guiding screen, and the 4th water proof band is pairs of and distinguishes It is set to the two sides wire side of the pure water flow-guiding screen.

10. a kind of purifier, it is characterised in that: including reverse-osmosis membrane element as described in any one of claims 1-9.