CN218795111U

CN218795111U - Roll type reverse osmosis membrane element and water purifier with same

Info

Publication number: CN218795111U
Application number: CN202223160293.9U
Authority: CN
Inventors: 陈静; 李一然; 詹婷; 陈子斌; 宁贵勇; 李文灿
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2022-11-28
Filing date: 2022-11-28
Publication date: 2023-04-07
Anticipated expiration: 2032-11-28

Abstract

The utility model provides a formula of book reverse osmosis membrane element and have its purifier, formula of book reverse osmosis membrane element includes: the central tube, the first reverse osmosis membrane and the second reverse osmosis membrane, wherein the first reverse osmosis membrane is bent to form a first long page, a first folded edge and a first short page, the second reverse osmosis membrane is bent to form a second long page, a second folded edge and a second short page, and the first short page and the second short page are arranged oppositely; the partial section of the first long page and the first short page form a first raw water flow channel, the partial section of the second long page and the second short page form a second raw water flow channel, and the partial section of the first long page, which is longer than the first short page, and the partial section of the second long page, which is longer than the second short page, form a third raw water flow channel. The sum of the flow cross sectional areas of the first raw water flow passage and the second raw water flow passage is larger than the flow cross sectional area of the third raw water flow passage. According to the utility model discloses can promote the dense water side membrane face velocity of flow, slow down the polarization of dense water side concentration, promote reverse osmosis membrane's antipollution performance, prolong reverse osmosis membrane filter core's life.

Description

Roll type reverse osmosis membrane element and water purifier with same

Technical Field

The utility model relates to a water purifier technical field, concretely relates to formula of book reverse osmosis membrane element and purifier that has it.

Background

The roll type reverse osmosis membrane element forms a water purification element by rolling the water inlet separation net, the reverse osmosis membrane and the pure water diversion cloth on the central water production pipe. By utilizing the permeation function of the reverse osmosis membrane, water molecules in the raw water permeate through the reverse osmosis membrane under the pressurization condition and are gathered at the pure water side to form pure water, the raw water gradually forms concentrated water at the concentrated water side, finally, the concentrated water flows out from the concentrated water outlet, and the pure water flows out from the pure water outlet. Along with the flowing of raw water in the raw water channel to the concentrated water outlet, as part of raw water is filtered by the reverse osmosis membrane and then is changed into pure water for output, the fluid flow rate of the surface of the reverse osmosis membrane in the raw water channel is gradually reduced, and the fluid flow rate of the membrane surface at the concentrated water side is the lowest. Because the flow velocity of the fluid on the membrane surface is gradually reduced and the solute in the fluid on the membrane surface is gradually increased, the concentration polarization on the concentrated water side is the most serious, and the pollution blockage is most easily caused. The concentration polarization phenomenon of a general reverse osmosis membrane element on the concentrated water side is obvious, and the service life of the membrane element is influenced.

Because the membrane face water velocity of flow in the former water flow of formula of book reverse osmosis membrane element among the prior art reduces along with the flow process gradually, and there is concentration polarization at the most serious in the flow direction downstream section, causes dirty technical problem such as stifled most easily, consequently the utility model discloses research and design a formula of book reverse osmosis membrane element and have its purifier.

SUMMERY OF THE UTILITY MODEL

Therefore, the to-be-solved technical problem of the utility model lies in overcoming the former water flow channel of formula of book reverse osmosis membrane element among the prior art and having concentration polarization at the flow direction downstream section most serious, easily causes the defect that dirt is stifled to a formula of book reverse osmosis membrane element and have its purifier is provided.

In order to solve the above problem, the present invention provides a rolled reverse osmosis membrane element, which comprises:

the first reverse osmosis membrane is bent to form a first long page, a first folding edge and a first short page which are connected in sequence, the length of the first long page is longer than that of the first short page, the second reverse osmosis membrane is bent to form a second long page, a second folding edge and a second short page which are connected in sequence, the length of the second long page is longer than that of the second short page, and the first short page and the second short page are arranged oppositely, so that the first reverse osmosis membrane and the second reverse osmosis membrane are folded into a whole and then are rolled onto the central tube;

the partial section of the first long page is opposite to the first short page and a first raw water flow channel is formed between the first long page and the first short page, the partial section of the second long page is opposite to the second short page and a second raw water flow channel is formed between the second short page and the second long page, the partial section of the first long page is longer than the partial section of the second long page, the partial section of the second short page is opposite to the second short page and a third raw water flow channel is formed between the second long page and the second short page, the first raw water flow channel and the second raw water flow channel are communicated with a raw water interface to enable raw water to flow into the first raw water flow channel and the second raw water flow channel, the water in the first raw water flow channel and the water in the second raw water flow channel flow into the third raw water flow channel respectively, and the sum of the flow cross-sectional areas of the first raw water flow channel and the second raw water flow channel is larger than the flow cross-sectional area of the third raw water flow channel.

In some embodiments, in a projection plane of the axial end face of the central tube, the first short leaf and the second short leaf have equal lengths and are both L2, the first long leaf and the second long leaf have equal lengths and are both L1, and L1 > L2.

The end part of the first short page is opposite to the end part of the second short page, the first folded edge is opposite to the second folded edge, and the end part of the first long page is opposite to the end part of the second long page.

In some embodiments, the first raw water flow passage and the second raw water flow passage are respectively provided with a water inlet on an axial end surface along an axial direction of the central tube, a length of the water inlet in a projection plane of the axial end surface of the central tube is L0, and L0 < L2.

In some embodiments, 1/3. Ltoreq. L2/L1. Ltoreq.3/4; L0/L2 is more than or equal to 1/10 and less than or equal to 1/2.

In some embodiments, a first water inlet separation net is further arranged in the first raw water flow channel and the third raw water flow channel, one end of the first water inlet separation net is connected with the first folded edge, and the other end of the first water inlet separation net extends to a position opposite to the end of the first long page, so that the first water inlet separation net extends from the first raw water flow channel to the third raw water flow channel; and a second water inlet separation net is also arranged in the second raw water flow channel, one end of the second water inlet separation net is connected with the second folded edge, and the other end of the second water inlet separation net extends to a position opposite to the end part of the second short leaf, so that the second water inlet separation net extends in the second raw water flow channel.

In some embodiments, in a projection plane of the axial end face of the central tube, the length of the first water inflow barrier is not less than the length of the first long leaf, and the length of the second water inflow barrier is greater than the length of the second short leaf.

In some embodiments, a first water inlet separation net is further arranged in the first raw water flow channel, one end of the first water inlet separation net is connected with the first folded edge, and the other end of the first water inlet separation net extends to a position opposite to the end of the first short leaf, so that the first water inlet separation net extends in the first raw water flow channel; and a second water inlet separation net is further arranged in the second raw water flow channel and the third raw water flow channel, one end of the second water inlet separation net is connected with the second folded edge, and the other end of the second water inlet separation net extends to a position opposite to the end part of the second long leaf, so that the second water inlet separation net extends from the second raw water flow channel to the third raw water flow channel.

In some embodiments, in a projection plane of an axial end face of the central tube, the length of the first water inflow barrier is greater than the length of the first short leaf, and the length of the second water inflow barrier is not less than the length of the second long leaf.

In some embodiments, the side of the first long sheet opposite to the first short sheet is the front side of the first long sheet, the side of the first short sheet opposite to the first long sheet is the front side of the first short sheet, and the first raw water channel is formed between the front side of the first long sheet and the front side of the first short sheet;

the surface of the second long page, which is opposite to the second short page, is the front surface of the second long page, the surface of the second short page, which is opposite to the second long page, is the front surface of the second short page, and a second raw water channel is formed between the front surface of the second long page and the front surface of the second short page;

the front surface of the partial section of the first long page, which is longer than the first short page, is opposite to the front surface of the partial section of the second long page, which is longer than the second short page, and a third raw water channel is formed between the front surfaces.

In some embodiments, a first pure water flow passage is formed between the back surface of the first short sheet and the back surface of the second short sheet, the back surface of the first short sheet is the side opposite to the first long sheet, pure water formed by filtration and purification of raw water in the first raw water flow passage through the first short sheet can enter the first pure water flow passage, and pure water formed by filtration and purification of raw water in the second raw water flow passage through the second short sheet can also enter the first pure water flow passage;

first reverse osmosis membrane with the second reverse osmosis membrane is folded as an organic whole and is rolled up and make back on the center tube, form second pure water runner between the back of first long page or leaf and the back of second long page or leaf, the raw water in the first raw water runner process the pure water that forms after the filtration purification of first long page or leaf can get into in the second pure water runner, the raw water in the second raw water runner process the pure water that forms after the filtration purification of second long page or leaf can get into in the second pure water runner, the raw water in the third raw water runner passes through respectively first long page or leaf with the pure water that forms after the filtration purification of second long page or leaf can get into in the second pure water runner.

In some embodiments, a first pure water flow guiding cloth is further disposed in the first pure water flow passage, and a second pure water flow guiding cloth is further disposed in the second pure water flow passage;

in a projection plane of the axial end face of the central tube, the length of the first pure water guide cloth is greater than that of the first short sheet, and the length of the first short sheet is equal to that of the second short sheet; the length of the second pure water flow guide cloth is greater than that of the first long page, and the length of the first long page is equal to that of the second long page.

In some embodiments, a first sealing element is connected between the back surface of the first short page and the back surface of the second short page, so that the pure water outlet of the first pure water flow channel faces the first folding edge; and a second sealing element is connected and arranged between the back surface of the first long sheet and the back surface of the second long sheet, so that the pure water outlet of the second pure water flow channel faces the first folding edge.

In some embodiments, the length of the first short leaf is equal to the length of the second short leaf in a plane of projection of the axial end face of the center tube; the length of the first long page is equal to that of the second long page.

In some embodiments, the end portion of the first folded edge and the end portion of the second folded edge after being folded are starting ends rolled onto the outer peripheral wall of the central tube, the open end formed between the end portion of the first long sheet and the end portion of the second long sheet is a terminal end rolled onto the central tube, the starting ends are connected with the outer peripheral wall of the central tube, and the terminal end is located at the radial outer side of the starting ends; the first pure water flow channel and the second pure water flow channel are communicated with the inside of the central tube, so that pure water after filtration and purification is discharged through the inside of the central tube, and concentrated water after filtration and purification flows out through an opening end formed between the end part of the first long page and the end part of the second long page.

In some embodiments, the end portion of the first long sheet and the end portion of the second long sheet are folded to form an opening end, and the end portion of the first folded sheet and the end portion of the second folded sheet are folded to form a starting end, and the end portion of the first folded sheet and the end portion of the second folded sheet are folded to form a terminal end, and the starting end is connected with the outer peripheral wall of the central tube, and the terminal end is located at the radial outer side of the starting end; the opening end between the end part of the first long page and the end part of the second long page is communicated with the inside of the central pipe, so that the filtered and purified concentrated water flows to the inside of the central pipe through the opening end between the end part of the first long page and the end part of the second long page, and the first pure water flow channel and the second pure water flow channel are respectively communicated to the outside of the roll type reverse osmosis membrane element, so that the filtered and purified pure water is respectively discharged through the first pure water flow channel and the second pure water flow channel.

In some embodiments, the first reverse osmosis membrane sheet and the second reverse osmosis membrane sheet form a reverse osmosis unit, and the reverse osmosis unit comprises at least two reverse osmosis units, wherein at least two reverse osmosis units are stacked and integrally rolled on the central pipe.

The utility model also provides a water purifier, it includes preceding arbitrary formula of book reverse osmosis membrane element.

The utility model provides a pair of formula of book reverse osmosis membrane element and have its purifier has following beneficial effect:

the utility model discloses a fold into first long page or leaf and first short page or leaf that differ in length with first reverse osmosis membrane respectively, fold into second reverse osmosis membrane into second long page or leaf and second short page or leaf that differ in length, and make two short pages or leaf set up relatively, form first raw water runner between the relative face of first long page or leaf and first short page or leaf, the relative face between second long page or leaf and the short page or leaf forms second raw water runner, and the part that first long page or leaf is grown between the first short page or leaf and the part that second long page or leaf is grown between the second short page or leaf form the third raw water runner directly relative face, the water flow direction is from first to third raw water runner and second to third raw water runner, thereby make the raw water merge into a third runner along the flow direction by two former raw water runners, can reduce the circulation cross-sectional area of fluid effectively, and then can increase the velocity of flow of fluid, the dense water side concentration polarization, promote the antipollution performance of reverse osmosis membrane, the life of extension reverse osmosis membrane filter core; namely the utility model discloses a folding length page or leaf and carry out the mode of rolling up the membrane and reduce the size of dense water side inlet channel effectively, effectively promote dense water side membrane velocity of flow, and then slow down dense water side concentration polarization, promote reverse osmosis membrane's antipollution performance, prolong reverse osmosis membrane filter core's life.

Drawings

Fig. 1 is a schematic structural view (a view in a projection plane of an axial end face of a center pipe, that is, a view in a cross section of the center pipe) of example 1 of a rolled reverse osmosis membrane element according to the present invention;

FIG. 1-1 is a schematic view of a roll-to-roll reverse osmosis membrane element of FIG. 1;

FIGS. 1-2 are schematic views of a pure water flow path of the spiral wound reverse osmosis membrane element of FIG. 1;

FIGS. 1-3 are schematic views of a concentrate flow path of the spiral wound reverse osmosis membrane element of FIG. 1;

FIGS. 1-4 are schematic views of the rolled reverse osmosis membrane element of FIG. 1 after rolling;

fig. 2 is a schematic structural view (a view in a projection plane of an axial end face of a central tube) of example 2 of the rolled reverse osmosis membrane element of the present invention;

fig. 3 is a schematic structural view (a view in a projection plane of an axial end face of a central tube) of example 3 of the roll type reverse osmosis membrane element of the present invention;

fig. 4 is a schematic structural view (a view in a projection plane of an axial end face of a central tube) of example 4 of the rolled reverse osmosis membrane element of the present invention;

fig. 5 is a schematic structural view (a view in a projection plane of an axial end face of a center pipe) of example 5 of the rolled reverse osmosis membrane element of the present invention.

The reference numerals are represented as:

100. a central tube; 1. a first reverse osmosis membrane; 11. a first long page; 12. a first short page; 13. a first folded edge; 2. a second reverse osmosis membrane; 21. a second long page; 22. a second short page; 23. a second folded edge; 31. a first water inlet separation net; 32. a second water inlet separation net; 41. a first pure water guide cloth; 42. a second pure water diversion cloth; 51. a first seal member; 52. a second seal member; 201. a first raw water flow passage; 202. a second raw water flow passage; 203. a third raw water flow passage; 301. a first pure water flow passage; 302. a second pure water flow passage; 401. a water inlet; 402. a concentrated water outlet; 403. and a pure water outlet.

Detailed Description

As shown in fig. 1-5, the utility model provides a roll type reverse osmosis membrane element, which comprises:

the membrane comprises a central tube 100, a first reverse osmosis membrane 1 and a second reverse osmosis membrane 2, wherein the first reverse osmosis membrane 1 is bent to form a first long page 11, a first folded edge 13 and a first short page 12 which are sequentially connected, the length of the first long page 11 is longer than that of the first short page 12, the second reverse osmosis membrane 2 is bent to form a second long page 21, a second folded edge 23 and a second short page 22 which are sequentially connected, the length of the second long page 21 is longer than that of the second short page 22, and the first short page 12 and the second short page 22 are oppositely arranged, so that the first reverse osmosis membrane 1 and the second reverse osmosis membrane 2 are integrally stacked and then rolled on the central tube 100;

the first long sheet 11 has a section facing the first short sheet 12 and forming a first raw water channel 201 therebetween, the second long sheet 21 has a section facing the second short sheet 22 and forming a second raw water channel 202 therebetween, the first long sheet 11 has a section from which the first short sheet 12 extends and a section from which the second long sheet 21 extends and forming a third raw water channel 203 therebetween, the first raw water channel 201 and the second raw water channel 202 are connected to a raw water port so that raw water can be introduced, water in the first raw water channel 201 and water in the second raw water channel 202 flow into the third raw water channel 203, respectively, and a sum of flow cross-sectional areas of the first raw water channel 201 and the second raw water channel 202 is greater than a flow cross-sectional area of the third raw water channel 203. The flow cross-sectional area refers to the area of a cross-section perpendicular to the direction of fluid flow. The utility model discloses a first and second reverse osmosis membrane is two independent reverse osmosis membrane respectively, forms through the not isostructure concatenation of the short page or leaf of length.

The utility model discloses a fold into first long page or leaf and first short page or leaf that differ in length with first reverse osmosis membrane respectively, fold into second reverse osmosis membrane into second long page or leaf and second short page or leaf that differ in length, and make two short pages or leaf set up relatively, form first raw water runner between the relative face of first long page or leaf and first short page or leaf, the relative face between second long page or leaf and the short page or leaf forms second raw water runner, and the part that first long page or leaf is grown between the first short page or leaf and the part that second long page or leaf is grown between the second short page or leaf form the third raw water runner directly relative face, the water flow direction is from first to third raw water runner and second to third raw water runner, thereby make the raw water merge into a third runner along the flow direction by two former raw water runners, can reduce the circulation cross-sectional area of rivers effectively, and then can increase fluidic velocity of flow, the concentrated water side concentration polarization, promote the antipollution performance of reverse osmosis membrane, the life of extension membrane filter core; namely the utility model discloses a folding length page or leaf and carry out the mode of rolling up the membrane and reduce the size of dense water side inlet channel effectively, effectively promote dense water side membrane velocity of flow, and then slow down dense water side concentration polarization, promote reverse osmosis membrane's antipollution performance, prolong reverse osmosis membrane filter core's life.

The utility model discloses a formula of book reverse osmosis membrane element, be in including center tube and system of book first reverse osmosis diaphragm, second reverse osmosis diaphragm, first graticule mesh, second graticule mesh and the first pure water conservancy diversion cloth of intaking on the center tube. The front faces of the first reverse osmosis membrane and the second reverse osmosis membrane are folded in half to form a folded edge, and a long sheet and a short sheet which are distinguished by the folded edge are formed, a first raw water channel is formed between a first long sheet and a first short sheet of the first reverse osmosis membrane, a second raw water channel is formed between a second long sheet and a second short sheet of the second reverse osmosis membrane, a third raw water channel is formed between the first long sheet of the first reverse osmosis membrane and the front face of the second long sheet of the second reverse osmosis membrane, the first water inlet grid is inserted into the first raw water channel and the third raw water channel, and the second water inlet grid is inserted into the second raw water channel; or the first water inlet grid is inserted in the second raw water flow channel and the third raw water flow channel, and the second water inlet grid is inserted in the first raw water flow channel. The main function of the water inlet grid is to form a water passing gap and a water passing flow channel between the reverse osmosis membrane and the front surface of the reverse osmosis membrane, so that raw water can smoothly flow through the surface of the reverse osmosis membrane. The size of the concentrated water side water inlet flow channel is reduced by folding the long and short leaf rolling membrane, the membrane surface flow rate of the concentrated water side is improved, the concentration polarization of the concentrated water side is slowed down, the pollution resistance of the reverse osmosis membrane is improved, and the service life of the reverse osmosis membrane filter element is prolonged.

In some embodiments, in a projection plane of the axial end face of the central tube 100 (i.e., in a cross-sectional plane of the central tube, such as the plane shown in fig. 1), the first short leaf 12 and the second short leaf 22 have equal lengths and are both L2, the first long leaf 11 and the second long leaf 21 have equal lengths and are both L1, and L1 > L2; L2/L1 is more than or equal to 1/3 and less than or equal to 3/4.

The end of the first short sheet 12 is opposite to the end of the second short sheet 22, the first folded edge 13 is opposite to the second folded edge 23, and the end of the first long sheet 11 is opposite to the end of the second long sheet 21.

This is the utility model discloses a first long page or leaf, first short page or leaf, preferred position relation and size relation between second long page or leaf and the second short page or leaf, first and the long length of page or leaf equals promptly, the length of first short page or leaf and second short page or leaf equals, the length of two short pages or leaf is all good at to the length of two long pages or leaves, can filter respectively in two long pages or leaves and the short page or leaf raw water runner relative respectively, it merges two runners to realize effectively merging when two raw water runners between two long pages or leaf that are good at the short page or leaf again, thereby effectively reduce the flow cross-sectional area, and then increase fluidic flow velocity, thereby effectively reduce the concentration polarization of dense water side, prevent to produce the condition emergence of filthy stifled, promote reverse osmosis membrane's antipollution performance.

Further preferably, the ratio of the length of the side edge of the first short page perpendicular to the folded edge (namely, the length L2 of the first short page) to the length of the side edge of the first long page perpendicular to the folded edge (namely, the length L1 of the first long page) is 1-3. L2 can not be too short, otherwise, the pressure loss of the flow channel can be increased, the flow utilization rate of the filter element can be reduced, the performance of the filter element can be reduced, L2 can not be too long, otherwise, the flow velocity improving effect is limited, and the effect is not obvious.

Preferably, the first reverse osmosis membrane is the same size as the second reverse osmosis membrane.

In some embodiments, each of the first raw water flow passage 201 and the second raw water flow passage 202 has an axial end provided with a water inlet 401 (i.e., a raw water inlet), and a length of the water inlet 401 in a projection plane of an axial end surface of the central pipe 100 is L0, where L0 < L2. This is the utility model discloses a further preferred structural style, the length of water inlet is less than the length of short page or leaf promptly, and the raw water import is used for the raw water to get into the positive runner within a definite time of reverse osmosis membrane, and length needs are suitable, and length too little can lead to the resistance too big, it is not smooth to intake, and length too big can lead to the runner direction to change, influences the design performance. Further preferably, 1/10. Ltoreq.L 0/L2. Ltoreq.1/2.

Example 1, in some embodiments, a first water inlet separation net 31 is further disposed in the first raw water channel 201 and the third raw water channel 203, one end of the first water inlet separation net 31 is connected to the first folding edge 13, and the other end of the first water inlet separation net 31 extends to a position opposite to the end of the first long leaf 11, so that the first water inlet separation net 31 extends from the first raw water channel 201 to the third raw water channel 203; a second water inlet separation net 32 is further arranged in the second raw water flow passage 202, one end of the second water inlet separation net 32 is connected with the second flange 23, and the other end of the second water inlet separation net 32 extends to a position opposite to the end of the second short leaf 22, so that the second water inlet separation net 32 extends in the second raw water flow passage 202.

This is a preferable configuration of the first and second water-inflow spacers of embodiment 1 of the present invention, that is, the first water-inflow spacer extends from the first raw water channel to the third raw water channel, and simultaneously supports the raw water channel between the first short sheet and the first long sheet and supports the third raw water channel between the first and second long sheets, and the second water-inflow spacer is only used to effectively support the second raw water channel between the second long sheet and the second short sheet.

In some embodiments, in the projection plane of the axial end face of the central tube 100, the length of the first water-inlet spacer 31 is not less than the length of the first long leaf 11, and the length of the second water-inlet spacer 32 is greater than the length of the second short leaf 22. The utility model discloses thereby the length of first water inflow partition net is not less than the length of first long page or leaf and can extend to the former water runner of third from first former water runner to support the whole length section of first long page or leaf, the length of second inflow partition net is longer than the length of the short page or leaf of second and can effectively just all support the whole length section of the short page or leaf of second.

Preferably, the length of the first water inlet grid is 1-10mm longer than the length of the side edge of the first long page perpendicular to the folded edge (namely the length L1 of the first long page); the length of the graticule mesh of intaking is longer than diaphragm length slightly, can guarantee that all diaphragm surfaces have the graticule mesh of intaking, and all diaphragm surfaces of make full use of are used for filtering, avoid diaphragm and the direct laminating of diaphragm surface to lead to the fluid can't pass through.

Embodiment 1 and 2, the utility model discloses a formula of book reverse osmosis membrane element, it includes the center tube and rolls up the system first reverse osmosis diaphragm, second reverse osmosis diaphragm, first graticule mesh, the second graticule mesh of intaking and first pure water conservancy diversion cloth on the center tube. The front sides of the first reverse osmosis membrane and the second reverse osmosis membrane are folded in half to form a folded edge, and two long leaves and two short leaves which are distinguished by the folded edge are formed, a first raw water channel is formed between a first long leaf and a first short leaf of the first reverse osmosis membrane, a second raw water channel is formed between a second long leaf and a second short leaf of the second reverse osmosis membrane, a third raw water channel is formed between a first long leaf of the first reverse osmosis membrane and a second long leaf of the second reverse osmosis membrane, the first water inlet grid is inserted into the first raw water channel and the third raw water channel, and the second water inlet grid is inserted into the second raw water channel (embodiment 1); or the first water inlet grid is inserted in the second raw water flow passage and the third raw water flow passage, and the second water inlet grid is inserted in the first raw water flow passage (embodiment 2).

Preferably, the back surfaces of the first reverse osmosis membrane short sheet and the second reverse osmosis membrane short sheet are partially sealed to form a pure water channel with one end close to the folded edge as a pure water outlet, and the first pure water guide cloth is laminated between the back surfaces of the first reverse osmosis membrane short sheet and the second reverse osmosis membrane short sheet.

Example 2, in some embodiments, a first water inlet separation net 31 is further disposed in the first raw water flow channel 201, one end of the first water inlet separation net 31 is connected to the first folded edge 13, and the other end of the first water inlet separation net 31 extends to a position opposite to the end of the first short leaf 12, so that the first water inlet separation net 31 extends in the first raw water flow channel 201; a second water inlet separation net 32 is further arranged in the second raw water channel 202 and the third raw water channel 203, one end of the second water inlet separation net 32 is connected with the second folded edge 23, and the other end of the second water inlet separation net extends to a position opposite to the end of the second long leaf 21, so that the second water inlet separation net 32 extends from the second raw water channel 202 to the third raw water channel 203.

This is the preferred structure of the first and second water-in screens of embodiment 2 of the present invention, i.e. the second water-in screen extends from the second raw water channel to the third raw water channel, and simultaneously supports the raw water channel between the second short sheet and the second long sheet and supports the third raw water channel between the first and second long sheets, while the first water-in screen is only used to effectively support the first raw water channel between the first long sheet and the first short sheet.

In some embodiments, in the projection plane of the axial end face of the central tube 100, the length of the first water-inlet spacer 31 is greater than the length of the first short leaf 12, and the length of the second water-inlet spacer 32 is greater than the length of the second long leaf 21. The utility model discloses thereby the length of the second water inflow partition net is not less than the length of the long page or leaf of second can be followed first raw water runner and extended to the raw water runner of third to support the whole length section of the long page or leaf of second, the first length of intaking partition net is longer than the length of first short page or leaf and can be effectively just all support the whole length section of first short page or leaf.

In some embodiments, the surface of the first long sheet 11 opposite to the first short sheet 12 is the front surface of the first long sheet 11, the surface of the first short sheet 12 opposite to the first long sheet 11 is the front surface of the first short sheet 12, and the first raw water flow passage 201 is formed between the front surface of the first long sheet 11 and the front surface of the first short sheet 12;

the surface of the second long sheet 21 opposite to the second short sheet 22 is the front surface of the second long sheet 21, the surface of the second short sheet 22 opposite to the second long sheet 21 is the front surface of the second short sheet 22, and the second raw water channel 202 is formed between the front surface of the second long sheet 21 and the front surface of the second short sheet 22;

the front surface of the section of the first long sheet 11 from which the first short sheet 12 extends is opposite to the front surface of the section of the second long sheet 21 from which the second short sheet 22 extends, and the third raw water flow passage 203 is formed therebetween.

This is the utility model discloses a first long page or leaf, first short page or leaf, the long page or leaf of second and the short page or leaf of second and first and second, position relation and formation mode between the third former water flow way, the face of two relative pages or leaf is positive promptly, the face that carries on the back is the back, first former water flow way forms between the front of first long page or leaf and first short page or leaf, the former water flow way of second forms between the front of second long page or leaf and second short page or leaf, third former water flow way forms the relative space in the front of first long page or leaf and second long page or leaf, can effectively realize following two runners and merge the effect into a runner along the direction of flow, thereby reduce the cross sectional area of circulation, increase the velocity of flow, and then reduce concentration polarization, reduce filth stifled, pollution abatement.

In some embodiments, a first pure water flow channel 301 is formed between the back surface of the first short sheet 12 and the back surface of the second short sheet 22, the back surface of the first short sheet 12 is the side opposite to the first long sheet 11, pure water formed by filtration and purification of raw water in the first raw water flow channel 201 through the first short sheet 12 can enter the first pure water flow channel 301, and pure water formed by filtration and purification of raw water in the second raw water flow channel 202 through the second short sheet 22 can also enter the first pure water flow channel 301;

the first reverse osmosis membrane 1 and the second reverse osmosis membrane 2 are stacked into a whole and rolled on the central pipe 100, a second pure water flow channel 302 is formed between the back of the first long leaf 11 and the back of the second long leaf 21, pure water formed after filtration and purification of the first long leaf 11 in the first raw water flow channel 201 can enter the second pure water flow channel 302, pure water formed after filtration and purification of the second long leaf 21 in the second raw water flow channel 202 can enter the second pure water flow channel 302, and pure water formed after filtration and purification of the first long leaf 11 and the second long leaf 21 in the third raw water flow channel 203 can enter the second pure water flow channel 302.

The first pure water channel and the second pure water channel are formed in the utility model, namely, the first pure water channel is formed between the back surfaces of the first short page and the second short page, and the water in the respective raw water channel is filtered and purified through the two short pages, so that the purified pure water obtained through the short pages enters the first pure water channel; and a second pure water flow channel is formed between the back surfaces of the first long page and the second long page, so that the water in the first raw water flow channel and the second raw water flow channel is filtered and purified respectively through the two long pages, the water in the third raw water flow channel is filtered and purified respectively through the two long pages, and the formed pure water enters the second pure water flow channel and can be discharged in different modes finally.

In some embodiments, a first pure water guide cloth 41 is further disposed in the first pure water flow passage 301, and a second pure water guide cloth 42 is further disposed in the second pure water flow passage 302;

in a projection plane of the axial end face of the central tube 100, the length of the first pure water guide cloth 41 is greater than that of the first short leaf 12, and the length of the first short leaf 12 is equal to that of the second short leaf 22; the length of the second pure water guide cloth 42 is greater than that of the first long sheet 11, and the length of the first long sheet 11 is equal to that of the second long sheet 21.

The utility model can provide space and diversion for the flow of pure water through the first pure water diversion cloth arranged in the first pure water runner, and the second pure water diversion cloth arranged in the second pure water runner can provide space and diversion for the flow of pure water, and the pure water guide cloth is longer than the membrane length, so that the water produced on the back surfaces of all the reverse osmosis membranes can be smoothly guided out, and the situation that the pure water cannot effectively flow out due to direct fitting between the back surfaces of the reverse osmosis membranes is avoided.

The main function of the pure water flow guide cloth is to form a water passing gap and a water production flow channel between the back surface and the back surface of the reverse osmosis membrane, raw water on the raw water side of the reverse osmosis membrane permeates through the reverse osmosis membrane to the back surface of the reverse osmosis membrane under the action of pressure, and the produced water flows out along the pure water flow channel formed by the pure water flow guide cloth. Therefore, the pure water diversion cloth is slightly longer than the length of the membrane, so that the water produced on the back of all the reverse osmosis membranes can be smoothly guided out, and the situation that pure water cannot effectively flow out due to direct fitting between the backs of the reverse osmosis membranes is avoided.

Preferably, the length of the first pure water guide cloth is 1-10mm longer than the length of the side edge of the first short sheet (i.e., the first short sheet 12) perpendicular to the folded edge.

In some embodiments, a first seal 51 (shown in U-shaped configuration in fig. 1-2) is disposed between the back of the first flap 12 and the back of the second flap 22 such that the first pure water channel 301 has a pure water outlet facing the first folded edge 13; a second sealing member 52 is connected between the back of the first long sheet 11 and the back of the second long sheet 21, so that the pure water outlet of the second pure water flow passage 302 faces the first folding edge 13.

The sealing elements with different structures in the two pure water flow passages of the utility model are in structural forms, and the first sealing element can effectively prevent the water in the first pure water flow passage from being mixed with the raw water in the raw water flow passage and the outside; the second sealing member can effectively prevent the water in the second pure water flow passage from being mixed with the raw water in the raw water flow passage and with the outside; ensures that the filtered pure water is not mixed with the raw water, and improves the purification effect.

Examples 1 and 3, in some embodiments, the end of the folded first folded edge 13 and the end of the folded second folded edge 23 is a starting end rolled onto the outer peripheral wall of the central tube 100, the opening end formed between the end of the first long leaf 11 and the end of the second long leaf 21 is a terminal end rolled onto the central tube 100, the starting end is connected to the outer peripheral wall of the central tube 100, and the terminal end is located at the radial outer side of the starting end; the first pure water flow passage 301 and the second pure water flow passage 302 are both communicated with the inside of the center pipe 100, so that pure water after filtration and purification is discharged through the inside of the center pipe 100, and concentrated water after filtration and purification flows out through an open end formed between the end of the first long sheet 11 and the end of the second long sheet 21.

The utility model discloses a this kind of structural style can make hem meet with the center tube and roll up the system, and the open end is located the radial outside of rolling up the system, and the raw water import gets into first and the second raw water runner, can enter into first and the second pure water runner in the filtration purification through the reverse osmosis diaphragm, and with the inside intercommunication of center tube, inside with flowing into the center tube, carry out derivation and the transport of pure water, dense water then flows to the open end of the first and the long tip formation of second long page or leaf and is discharged, thereby can also improve the speed of raw water flow process (especially the position that merges at the runner) when effectively realizing normal filtration purification, thereby increase the velocity of flow in the third raw water runner, reduce the concentration polarization in the third raw water runner, improve antifouling stifled ability.

Preferably, the short side of the first pure water flow guide cloth, which is close to the pure water outlet, is connected with the central pipe, and then the adhered reverse osmosis membrane, the water inlet grid and the pure water flow guide cloth are rolled on the central pipe, so that the pure water outlet of the rolled pure water flow channel faces the central pipe;

preferably, the raw water flow channel part is sealed by applying glue on the end surface of the rolled reverse osmosis membrane and the water inlet grid, and the glue applying position is a part far away from the central pipe, so that a raw water inlet (a water inlet 401) is formed on the end surface at a position close to the central pipe.

Preferably, the length of the raw water inlet accounts for 1/10-1/2 of the length of the side edge of the first short leaf adjacent to the folded edge. The raw water inlet is used for enabling raw water to enter a flow channel between the front faces of the reverse osmosis membranes, the length needs to be proper, too small length can cause overlarge resistance and unsmooth water inflow, and too large length can cause the direction of the flow channel to be changed, so that the design performance is influenced.

Examples 4 and 5, as shown in fig. 4 and 5, in some embodiments, the open end formed between the end of the first long sheet 11 and the end of the second long sheet 21 is folded to be a starting end rolled onto the outer peripheral wall of the central tube 100, and the end of the first folded edge 13 and the second folded edge 23 is folded to be a terminal end rolled onto the central tube 100, the starting end being in contact with the outer peripheral wall of the central tube 100, and the terminal end being located radially outside the starting end; an opening between the end of the first long sheet 11 and the end of the second long sheet 21 communicates with the inside of the central tube 100, so that the filtered and purified concentrated water flows to the inside of the central tube 100 through the opening between the end of the first long sheet 11 and the end of the second long sheet 21, and the first pure water flow passage 301 and the second pure water flow passage 302 communicate with the outside of the rolled reverse osmosis membrane element, respectively, so that the filtered and purified pure water is discharged through the first pure water flow passage 301 and the second pure water flow passage 302, respectively.

The utility model discloses a this kind of structural style can make the open end meet with the center tube and roll up the system, and the hem is located the radial outside of rolling up the system, and the raw water import gets into first and the second raw water runner, can enter into first and the second pure water runner at the filtration purification through the reverse osmosis diaphragm, discharge to the radial outside, carry out derivation and the transport of pure water, and dense water then flows to the open end that the tip of first and the long page or leaf of second formed and inside the entering center tube of being discharged, inside with the inflow center tube, thereby can also improve the speed of raw water flow process (especially the position that merges at the runner) when effectively realizing normal filtration purification, thereby increase the velocity of flow in the third raw water runner, reduce the concentration polarization in the third raw water runner, improve antifouling stifled ability.

Examples 3 and 5, fig. 3 and 5, in some embodiments, the first reverse osmosis membrane sheet 1 and the second reverse osmosis membrane sheet 2 constitute a reverse osmosis unit, and there are at least two reverse osmosis units, at least two of which are stacked and integrally rolled onto the central pipe 100.

Example 3:

referring to fig. 3, a roll type reverse osmosis membrane element includes a central tube, and a first reverse osmosis membrane, a second reverse osmosis membrane, a third reverse osmosis membrane, a fourth reverse osmosis membrane, a first water inlet grid, a second water inlet grid, a first pure water guide cloth, and a second pure water guide cloth, which are rolled on the central tube.

The front faces of the first reverse osmosis membrane and the second reverse osmosis membrane are folded in half to form a folded edge, and two long leaves and two short leaves which are distinguished by the folded edge;

the front faces of the third reverse osmosis membrane and the fourth reverse osmosis membrane are folded in half to form a folded edge, and two long leaves and two short leaves which are distinguished by the folded edge;

the back surfaces of the first reverse osmosis membrane short sheet and the second reverse osmosis membrane short sheet are partially sealed to form a pure water channel with one end close to the folded edge as a pure water outlet, and the first pure water diversion cloth is laminated between the back surfaces of the first reverse osmosis membrane short sheet and the second reverse osmosis membrane short sheet.

And a part between the second long sheet of the second reverse osmosis membrane and the back surface of the third long sheet of the third reverse osmosis membrane is sealed to form a pure water flow channel, one end of which close to the folded edge is a pure water outlet, and the second pure water guide cloth is laminated between the second long sheet of the second reverse osmosis membrane and the back surface of the third long sheet of the third reverse osmosis membrane.

The back surfaces of the third reverse osmosis membrane short sheet and the fourth reverse osmosis membrane short sheet are partially sealed to form a pure water channel with one end close to the folded edge as a pure water outlet, and the third pure water diversion cloth is laminated between the back surfaces of the third reverse osmosis membrane short sheet and the fourth reverse osmosis membrane short sheet.

Preferably, the lengths of the long pages are all equal, and the lengths of the short pages are all equal;

preferably, the ratio of the length of the side edge of each short page perpendicular to the folded edge to the length of the side edge of each long page perpendicular to the folded edge is 1;

preferably, the length of the first water inlet grid is 1-10mm longer than the length of the side edge of each long page, which is perpendicular to the folded edge;

preferably, the length of the second water inlet grid is 5-10mm longer than the length of the side edge of each short page, which is perpendicular to the folded edge;

preferably, the length of the first pure water guide cloth is 1-10mm longer than the length of the side edge of each short sheet perpendicular to the folded edge;

preferably, the length of the second pure water flow guide cloth is 1-10mm longer than the length of the side edge, perpendicular to the folded edge, of each long page;

preferably, the reverse osmosis membranes are the same size.

Preferably, the short sides of the first and second pure water guide cloths, which are close to the pure water outlet, are connected with the central pipe, and then the adhered reverse osmosis membrane, the water inlet grid and the pure water guide cloths are rolled on the central pipe, so that the pure water outlet of the rolled pure water flow passage faces the central pipe;

preferably, the raw water flow channel part is sealed by applying glue on the end surfaces of the rolled reverse osmosis membrane and the water inlet grid, and the glue applying position is a part far away from the central pipe, so that a raw water inlet is formed at a position close to the central pipe on the end surface;

preferably, the length of the raw water inlet accounts for 1/10-1/3 of the length of the side edge of the first long page adjacent to the folded edge;

the utility model discloses a roll over the mode that pastes the membrane of length page or leaf and reduce the cross-sectional area that dense water side intake runner, promote the dense water side membrane face velocity of flow, and then slow down the polarization of dense water side concentration, promote reverse osmosis membrane's antipollution performance, prolong the life of reverse osmosis membrane filter core.

The utility model discloses still including the purifier that has above-mentioned reverse osmosis membrane element.

Example 4:

as shown in fig. 4, a roll type reverse osmosis membrane element includes a central tube, and a first reverse osmosis membrane, a second reverse osmosis membrane, a first water inlet grid, a second water inlet grid, and a first pure water guide cloth which are rolled on the central tube. First reverse osmosis membrane and the positive fifty percent discount of second reverse osmosis membrane form the hem and by two long pages and two short pages of hem differentiation, form first raw water runner between the first long page or leaf of first reverse osmosis membrane and first short page or leaf, form second raw water runner between the second long page or leaf of second reverse osmosis membrane and the second short page or leaf, form third raw water runner between the first long page or leaf of first reverse osmosis membrane and the second long page or leaf of second reverse osmosis membrane openly, first graticule mesh of intaking is inserted and is established in first raw water runner and the third raw water runner, the second graticule mesh of intaking is inserted and is established in the second raw water runner.

Preferably, a part of the back surface of the first short sheet of the first reverse osmosis membrane and the back surface of the second short sheet of the second reverse osmosis membrane is sealed to form a pure water channel, one end of the pure water channel, which is far away from the folded edge, is a pure water outlet, and the first pure water guide cloth is laminated between the back surfaces of the first short sheet of the first reverse osmosis membrane and the second short sheet of the second reverse osmosis membrane.

preferably, the ratio of the length of the side edge of each short sheet perpendicular to the folded edge to the length of the side edge of each long sheet perpendicular to the folded edge is 1;

preferably, the length of the second water inlet grid is 5-10mm longer than the length of the side edge of each short page perpendicular to the folded edge;

Preferably, the short side of the first pure water flow guide cloth, which is far away from the pure water outlet, is connected with the central pipe, and then the bonded reverse osmosis membrane, the water inlet grid and the pure water flow guide cloth are rolled on the central pipe, so that the outlet of the rolled raw water flow channel faces the central pipe, and the pure water outlet of the pure water flow channel is positioned on the outer side surface;

preferably, the raw water flow channel part is sealed by applying glue on the end surface of the rolled reverse osmosis membrane and the water inlet grid, and the glue applying position is a part close to the central pipe, so that a raw water inlet is formed at a position close to the outer side surface on the end surface.

the utility model discloses a mode of rolling up the membrane of pasting length page or leaf reduces the concentrated water side inlet channel's sectional area, promotes the concentrated water side membrane velocity of flow, and then slows down concentrated water side concentration polarization, promotes reverse osmosis membrane's antipollution performance, prolongs the life of reverse osmosis membrane filter core.

As in fig. 5, example 5:

the utility model provides a formula of book reverse osmosis membrane element, its includes the center tube and roll up first reverse osmosis membrane, second reverse osmosis membrane, third reverse osmosis membrane, fourth reverse osmosis membrane, fifth reverse osmosis membrane, sixth reverse osmosis membrane, first water grid, second water grid, first pure water conservancy diversion cloth and second pure water conservancy diversion cloth of system on the center tube.

the front sides of the third reverse osmosis membrane and the fourth reverse osmosis membrane are folded in half to form a folded edge, and two long leaves and two short leaves which are distinguished by the folded edge are formed;

the front faces of the fifth reverse osmosis membrane and the sixth reverse osmosis membrane are folded in half to form a folded edge, and two long leaves and two short leaves which are distinguished by the folded edge are formed;

the first short sheet of the first reverse osmosis membrane and the second short sheet of the second reverse osmosis membrane are partially sealed to form a pure water flow channel, one end of the pure water flow channel, far away from the folded edge, is a pure water outlet, and the first pure water guide cloth is laminated between the first short sheet of the first reverse osmosis membrane and the second short sheet of the second reverse osmosis membrane.

And a part between the second long sheet of the second reverse osmosis membrane and the back of the third long sheet of the third reverse osmosis membrane is sealed to form a pure water channel, one end of the pure water channel, which is far away from the folded edge, is a pure water outlet, and the second pure water diversion cloth is laminated between the second long sheet of the second reverse osmosis membrane and the back of the third long sheet of the third reverse osmosis membrane.

And a part between the third short sheet of the third reverse osmosis membrane and the back of the fourth short sheet of the fourth reverse osmosis membrane is sealed to form a pure water flow channel, one end of which far away from the folded edge is a pure water outlet, and the first pure water guide cloth is laminated between the third short sheet of the third reverse osmosis membrane and the back of the fourth short sheet of the fourth reverse osmosis membrane.

And a part between the fourth long sheet of the fourth reverse osmosis membrane and the back of the fifth long sheet of the fifth reverse osmosis membrane is sealed to form a pure water flow channel, one end of which is far away from the folded edge and is a pure water outlet, and the second pure water guide cloth is laminated between the fourth long sheet of the fourth reverse osmosis membrane and the back of the fifth long sheet of the fifth reverse osmosis membrane.

And a part between the fifth short sheet of the fifth reverse osmosis membrane and the back of the sixth short sheet of the sixth reverse osmosis membrane is sealed to form a pure water flow channel, one end of which is far away from the folded edge and is a pure water outlet, and the first pure water diversion cloth is laminated between the fifth short sheet of the fifth reverse osmosis membrane and the back of the sixth short sheet of the sixth reverse osmosis membrane.

Preferably, the long pages are all equal in length, and the short pages are all equal in length.

preferably, the length of the first pure water flow guide cloth is 1-10mm longer than the length of the side edge, perpendicular to the folded edge, of each short sheet;

preferably, the length of the second pure water guide cloth is 1-10mm longer than the length of the side edge of each long page perpendicular to the folded edge;

preferably, the reverse osmosis membranes are the same size.

Preferably, the short sides of the first pure water flow guide cloth and the second pure water flow guide cloth, which are far away from the pure water outlet, are connected with the central pipe, and then the adhered reverse osmosis membrane, the water inlet grid and the pure water flow guide cloth are rolled on the central pipe, so that the pure water outlet of the rolled pure water flow channel faces the central pipe;

preferably, the raw water flow channel part is sealed by applying glue on the end surfaces of the rolled reverse osmosis membrane and the water inlet grid, and the glue applying position is a part close to the central pipe, so that a raw water inlet is formed on the end surface at a position far away from the central pipe;

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention. The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims

1. A roll-type reverse osmosis membrane element is characterized in that: the method comprises the following steps:

the anti-leakage device comprises a central pipe (100), a first reverse osmosis membrane (1) and a second reverse osmosis membrane (2), wherein the first reverse osmosis membrane (1) is bent to form a first long page (11), a first folded edge (13) and a first short page (12) which are sequentially connected, the length of the first long page (11) is longer than that of the first short page (12), the second reverse osmosis membrane (2) is bent to form a second long page (21), a second folded edge (23) and a second short page (22) which are sequentially connected, the length of the second long page (21) is longer than that of the second short page (22), and the first short page (12) and the second short page (22) are oppositely arranged, so that the first reverse osmosis membrane (1) and the second reverse osmosis membrane (2) are integrally stacked and then rolled onto the central pipe (100); and the partial section of the first long leaf (11) is opposite to the first short leaf (12) and forms a first raw water flow passage (201) therebetween, the partial section of the second long leaf (21) is opposite to the second short leaf (22) and forms a second raw water flow passage (202) therebetween, the partial section of the first long leaf (11) from which the first short leaf (12) grows is opposite to the partial section of the second long leaf (21) from which the second short leaf (22) grows and forms a third raw water flow passage (203) therebetween, the first raw water flow passage (201) and the second raw water flow passage (202) are communicated with a raw water port so as to be capable of passing raw water, and water in the first raw water flow passage (201) and water in the second raw water flow passage (202) respectively flow toward the third raw water flow passage (203), and the sum of the flow cross-sectional areas of the first raw water flow passage (201) and the second raw water flow passage (202) is greater than the flow-through cross-sectional area of the third raw water flow passage (203).

2. The rolled reverse osmosis membrane element of claim 1, wherein:

in a projection plane of the axial end face of the central tube (100), the lengths of the first short leaf (12) and the second short leaf (22) are equal and are both L2, the lengths of the first long leaf (11) and the second long leaf (21) are equal and are both L1, and L1 is more than L2;

the end part of the first short sheet (12) is opposite to the end part of the second short sheet (22), the first folded edge (13) is opposite to the second folded edge (23), and the end part of the first long sheet (11) is opposite to the end part of the second long sheet (21).

3. The rolled reverse osmosis membrane element of claim 2, wherein:

the first raw water flow channel (201) and the second raw water flow channel (202) are respectively arranged on the axial end faces along the axial direction of the central pipe (100) and are provided with water inlets (401), the lengths of the water inlets (401) in the projection plane of the axial end face of the central pipe (100) are L0, and L0 is less than L2.

4. The rolled reverse osmosis membrane element of claim 3, wherein:

1/3≤L2/L1≤3/4；1/10≤L0/L2≤1/2。

5. the rolled reverse osmosis membrane element of claim 1, wherein:

a first water inlet separation net (31) is further arranged in the first raw water runner (201) and the third raw water runner (203), one end of the first water inlet separation net (31) is connected with the first folded edge (13), and the other end of the first water inlet separation net extends to a position opposite to the end part of the first long leaf (11), so that the first water inlet separation net (31) extends from the first raw water runner (201) to the third raw water runner (203); and a second water inlet separation net (32) is further arranged in the second raw water flow channel (202), one end of the second water inlet separation net (32) is connected with the second flange (23), and the other end of the second water inlet separation net extends to a position opposite to the end part of the second short leaf (22), so that the second water inlet separation net (32) extends in the second raw water flow channel (202).

6. The rolled reverse osmosis membrane element of claim 5, wherein:

in a projection plane of the axial end face of the central tube (100), the length of the first water inlet separation net (31) is not less than that of the first long leaf (11), and the length of the second water inlet separation net (32) is greater than that of the second short leaf (22).

7. The rolled reverse osmosis membrane element of claim 1, wherein:

a first water inlet separation net (31) is further arranged in the first raw water runner (201), one end of the first water inlet separation net (31) is connected with the first folding edge (13), and the other end of the first water inlet separation net extends to a position opposite to the end part of the first short leaf (12), so that the first water inlet separation net (31) extends in the first raw water runner (201); a second water inlet separation net (32) is further arranged in the second raw water flow channel (202) and the third raw water flow channel (203), one end of the second water inlet separation net (32) is connected with the second flange (23), and the other end of the second water inlet separation net extends to a position opposite to the end part of the second long sheet (21), so that the second water inlet separation net (32) extends from the second raw water flow channel (202) to the third raw water flow channel (203).

8. The rolled reverse osmosis membrane element of claim 7, wherein:

in a projection plane of the axial end face of the central tube (100), the length of the first water inlet separation net (31) is larger than that of the first short leaf (12), and the length of the second water inlet separation net (32) is not smaller than that of the second long leaf (21).

9. The rolled reverse osmosis membrane element of claim 1, wherein:

the surface of the first long sheet (11) opposite to the first short sheet (12) is the front surface of the first long sheet (11), the surface of the first short sheet (12) opposite to the first long sheet (11) is the front surface of the first short sheet (12), and the first raw water flow channel (201) is formed between the front surface of the first long sheet (11) and the front surface of the first short sheet (12);

the surface of the second long sheet (21) opposite to the second short sheet (22) is the front surface of the second long sheet (21), the surface of the second short sheet (22) opposite to the second long sheet (21) is the front surface of the second short sheet (22), and the second raw water flow passage (202) is formed between the front surface of the second long sheet (21) and the front surface of the second short sheet (22);

the front surface of the partial section of the first long sheet (11) which is longer than the first short sheet (12) is opposite to the front surface of the partial section of the second long sheet (21) which is longer than the second short sheet (22), and the third raw water flow passage (203) is formed between the front surfaces.

10. The rolled reverse osmosis membrane element of claim 9, wherein:

a first pure water flow channel (301) is formed between the back surface of the first short leaf (12) and the back surface of the second short leaf (22), the back surface of the first short leaf (12) is the side surface opposite to the first long leaf (11), pure water formed by filtering and purifying raw water in the first raw water flow channel (201) through the first short leaf (12) can enter the first pure water flow channel (301), and pure water formed by filtering and purifying raw water in the second raw water flow channel (202) through the second short leaf (22) can also enter the first pure water flow channel (301);

the first reverse osmosis membrane (1) and the second reverse osmosis membrane (2) are overlapped into a whole and rolled on the central pipe (100), a second pure water flow channel (302) is formed between the back of the first long page (11) and the back of the second long page (21), raw water in the first raw water flow channel (201) can enter the second pure water flow channel (302) through pure water formed after filtration and purification of the first long page (11), raw water in the second raw water flow channel (202) can enter the second pure water flow channel (302) through pure water formed after filtration and purification of the second long page (21), and raw water in the third raw water flow channel (203) can enter the second pure water flow channel (302) through pure water formed after filtration and purification of the first long page (11) and the second long page (21).

11. The rolled reverse osmosis membrane element of claim 10, wherein:

a first pure water guide cloth (41) is further arranged in the first pure water flow passage (301), and a second pure water guide cloth (42) is further arranged in the second pure water flow passage (302);

in a projection plane of the axial end face of the central pipe (100), the length of the first pure water guide cloth (41) is greater than that of the first short leaf (12), and the length of the first short leaf (12) is equal to that of the second short leaf (22); the length of the second pure water guide cloth (42) is greater than that of the first long page (11), and the length of the first long page (11) is equal to that of the second long page (21).

12. The rolled reverse osmosis membrane element of claim 10, wherein:

a first sealing element (51) is connected and arranged between the back surface of the first short sheet (12) and the back surface of the second short sheet (22) so that a pure water outlet of the first pure water flow channel (301) faces the first folding edge (13); and a second sealing element (52) is connected and arranged between the back surface of the first long page (11) and the back surface of the second long page (21) so that the pure water outlet of the second pure water flow passage (302) faces the first folding edge (13).

13. The rolled reverse osmosis membrane element of claim 10, wherein:

the end part of the folded first folded edge (13) and the folded second folded edge (23) is a starting end rolled onto the outer peripheral wall of the central tube (100), an opening end formed between the end part of the first long sheet (11) and the end part of the second long sheet (21) is a tail end rolled onto the central tube (100), the starting end is connected with the outer peripheral wall of the central tube (100), and the tail end is positioned on the radial outer side of the starting end; the first pure water flow passage (301) and the second pure water flow passage (302) are both communicated with the inside of the central pipe (100), so that pure water after filtration and purification is discharged through the inside of the central pipe (100), and concentrated water after filtration and purification flows out through an opening end formed between the end part of the first long leaf (11) and the end part of the second long leaf (21).

14. The rolled reverse osmosis membrane element of claim 10, wherein:

an opening end formed between the end part of the first long page (11) and the end part of the second long page (21) is a starting end rolled onto the outer peripheral wall of the central tube (100) after being overlapped, the end part formed after the first folded edge (13) and the second folded edge (23) are tail ends rolled onto the central tube (100), the starting end is connected with the outer peripheral wall of the central tube (100), and the tail ends are positioned on the radial outer side of the starting end; an opening between the end of the first long leaf (11) and the end of the second long leaf (21) is communicated with the inside of the central tube (100), so that the filtered and purified concentrated water flows to the inside of the central tube (100) through the opening end between the end of the first long leaf (11) and the end of the second long leaf (21), and the first pure water flow passage (301) and the second pure water flow passage (302) are respectively communicated to the outside of the rolled reverse osmosis membrane element, so that the filtered and purified pure water is discharged through the first pure water flow passage (301) and the second pure water flow passage (302), respectively.

15. The rolled reverse osmosis membrane element of claim 1, wherein:

the first reverse osmosis membrane (1) and the second reverse osmosis membrane (2) form reverse osmosis units, the number of the reverse osmosis units is at least two, and at least two reverse osmosis units are overlapped and integrally rolled on the central pipe (100).

16. A water purifier, which is characterized in that: comprising the roll-type reverse osmosis membrane element of any one of claims 1-15.