CN216711677U

CN216711677U - Reverse osmosis membrane element and filtration device

Info

Publication number: CN216711677U
Application number: CN202220240829.9U
Authority: CN
Inventors: 李恪平; 王冀
Original assignee: Foshan Shunde Apollo Air Cleaner Co Ltd
Current assignee: Freudenberg Apollo Filtration Technologies Co Ltd
Priority date: 2022-01-28
Filing date: 2022-01-28
Publication date: 2022-06-10
Anticipated expiration: 2032-01-28

Abstract

The utility model discloses a reverse osmosis membrane element and a filtering device, wherein the reverse osmosis membrane element comprises: center tube, reverse osmosis membrane piece subassembly. The reverse osmosis membrane assembly is wound on the central pipe, and a first water outlet and at least one water inlet are formed in the reverse osmosis membrane assembly. The two ends of the reverse osmosis membrane component, which are opposite to each other in the axial direction of the central pipe, are respectively a first end and a second end, the second end is provided with a water inlet, the first end is provided with a first water outlet, and the first water outlet and the water inlet are arranged in a staggered manner from the second end to the first end. Therefore, the reverse osmosis membrane component is convenient to wash by raw water and fully filters the raw water by the reverse osmosis membrane component. Simultaneously, the inside rivers of entering reverse osmosis membrane piece subassembly can form the washing away to the reverse osmosis membrane, reduce the salt and pile up on reverse osmosis membrane piece surface, improve reverse osmosis membrane element's filtration efficiency, increase reverse osmosis membrane piece subassembly's life.

Description

Reverse osmosis membrane element and filtration device

Technical Field

The utility model relates to the technical field of water purification, in particular to a reverse osmosis membrane element and a filtering device.

Background

Among the prior art, the mode of generally adopting perpendicular business turn over water among the reverse osmosis membrane or set up the water-stop strip in reverse osmosis membrane, simple process, but the washing force to the membrane surface is not enough when raw water gets into reverse osmosis membrane, reduces the utilization ratio of diaphragm, and the filter effect is not good, and produces the life who blocks up the influence reverse osmosis membrane diaphragm easily.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the utility model aims to provide a reverse osmosis membrane element which is good in filtering effect and long in service life.

The utility model further provides a filtering device which comprises the reverse osmosis membrane element.

A reverse osmosis membrane element according to an embodiment of the first aspect of the utility model comprises: the reverse osmosis membrane module is wound on the central tube and is provided with a first water outlet and at least one water inlet. The two ends, opposite to each other, of the reverse osmosis membrane assembly in the axial direction of the central pipe are respectively a first end and a second end, a water inlet is formed in the second end, a first water outlet is formed in the first end, and the first water outlet and the water inlet are arranged in a staggered mode in the direction from the second end to the first end.

According to the reverse osmosis membrane element provided by the embodiment of the utility model, the water inlet and the first water outlet are arranged at two ends of the central pipe, and the water inlet and the first water outlet are distributed in a staggered manner, so that raw water can be conveniently flushed and the reverse osmosis membrane element can fully filter the raw water. Simultaneously, the inside rivers of entering reverse osmosis membrane piece subassembly can form the washing away to the reverse osmosis membrane, avoid reverse osmosis membrane piece subassembly live time dirt of a specified duration to adhere to and block up filterable circulation passageway at the diaphragm surface, reduce the salt and pile up on reverse osmosis membrane piece surface, improve reverse osmosis membrane element's filtration efficiency, increase reverse osmosis membrane piece subassembly's life.

In some embodiments, the first water outlet is located at a side of the first end close to the central tube and the water inlet is located at a side of the second end far from the central tube, or the first water outlet is located at a side of the first end far from the central tube and the water inlet is located at a side of the second end close to the central tube.

In some embodiments, the reverse osmosis membrane element further comprises a second water outlet formed on a side edge of one of the sides of the reverse osmosis membrane module.

In some embodiments, the reverse osmosis membrane element further comprises a third water outlet formed at the first end and spaced apart from the first water outlet; and/or

The third water outlet is formed on the side edge of the one side of the reverse osmosis membrane module and is spaced apart from the second water outlet.

In some embodiments, the second water outlet is formed on a side of the one side of the reverse osmosis membrane assembly adjacent the first end.

In some embodiments, the reverse osmosis membrane element further comprises: a plurality of sealing strips, a plurality of said sealing strips comprising: first sealing strip and second sealing strip, first sealing strip is established first end, the second sealing strip is established reverse osmosis membrane subassembly on the side of one side thereof, first sealing strip with the second sealing strip is injectd jointly the second delivery port.

In some embodiments, the weatherstrip further comprises: a third sealing strip sealed at the second end, the third sealing strip and the second sealing strip together defining the water inlet.

In some embodiments, the first water outlet is located on a side of the third sealing strip remote from the second water outlet.

In some embodiments, the reverse osmosis membrane element further comprises a flow guide for guiding liquid flowing in from the water inlet to the first water outlet.

In some embodiments, the flow guide is provided at the connection of the first end and the side of one side of the reverse osmosis membrane assembly.

In some embodiments, the flow guide part has an arc-shaped section, the radius range of a circle of the arc-shaped section is R, and R satisfies the following conditions: r is more than or equal to 60mm and less than or equal to 75 mm.

In some embodiments, the reverse osmosis membrane element further comprises: a plurality of deflectors, it is a plurality of the deflector is side by side and the interval sets up in the inlet, follow the second end arrives in the direction of first end, the deflector orientation the direction slope of first outlet.

In some embodiments, the angle of inclination of the guide plate in the direction from the second end to the first end is x, and x satisfies: x is more than or equal to 20 degrees and less than or equal to 70 degrees.

In some embodiments, the ratio of the inner diameter of the water inlet to the length of the second end is a, said a satisfying: a is more than or equal to 0.05 and less than or equal to 0.35; and/or the ratio of the inner diameter of the first water outlet to the length of the second end is B, wherein B satisfies the following conditions: b is more than or equal to 0.05 and less than or equal to 0.35; and/or the ratio of the inner diameter of the second water outlet to the length of the side edge of one side of the reverse osmosis membrane assembly is C, and C satisfies the following conditions: c is more than or equal to 0.01 and less than or equal to 0.1.

A filtration device according to an embodiment of the second aspect of the utility model comprises a reverse osmosis membrane element according to any one of the embodiments described above.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic view of a reverse osmosis membrane element according to a first embodiment of the present invention.

Fig. 2 is a schematic view of a reverse osmosis membrane element according to a second embodiment of the present invention.

Fig. 3 is a schematic view of a reverse osmosis membrane element according to a third embodiment of the utility model.

Fig. 4 is a schematic view of a reverse osmosis membrane element according to a fourth embodiment of the present invention.

Fig. 5 is a schematic view of a reverse osmosis membrane element according to a fifth embodiment of the present invention.

Fig. 6 is a schematic view of a reverse osmosis membrane element according to a sixth embodiment of the present invention.

Fig. 7 is a schematic view of a reverse osmosis membrane element according to a seventh embodiment of the present invention.

Fig. 8 is a schematic view of a reverse osmosis membrane element according to an eighth embodiment of the present invention.

Fig. 9 is a schematic view of a reverse osmosis membrane element according to a ninth embodiment of the utility model.

Fig. 10 is a schematic view of a reverse osmosis membrane element according to a tenth embodiment of the present invention.

Fig. 11 is a schematic view of a reverse osmosis membrane element according to an eleventh embodiment of the utility model.

Fig. 12 is a schematic view of a reverse osmosis membrane element according to a twelfth embodiment of the utility model.

Fig. 13 is a schematic view of a reverse osmosis membrane element according to a thirteenth embodiment of the utility model.

Reference numerals:

a reverse osmosis membrane element 100;

a central tube 10;

a reverse osmosis membrane module 20; a water inlet 21; a first water outlet 22; a second water outlet 23;

a first seal strip 24; a second seal strip 25; a third sealing tape 26;

a flow guide 27; a guide plate 28; a third water outlet 29;

a first end 30; a second end 40.

Detailed Description

Embodiments of the present invention will be described in detail below, the embodiments described with reference to the drawings being exemplary, and a reverse osmosis membrane element 100 according to an embodiment of the present invention will be described below with reference to fig. 1 to 13. The reverse osmosis membrane element 100 includes: center tube 10, reverse osmosis membrane cartridge assembly 20. The reverse osmosis membrane element 100 can be applied to a filtration device, but does not represent a limitation thereto.

Specifically, as shown in fig. 1 and 2, a reverse osmosis membrane module 20 is wound on a central pipe 10, and a first water outlet 22 and at least one water inlet 21 are formed on the reverse osmosis membrane module 20. The two ends of the reverse osmosis membrane module 20 opposite to each other in the axial direction of the central tube 10 are a first end 30 and a second end 40, respectively, the first end 30 is formed with a first water outlet 22, the second end 40 is formed with a water inlet 21, and the first water outlet 22 and the water inlet 21 are arranged in a staggered manner in the direction from the second end 40 to the first end 30.

For example, as shown in fig. 1, the reverse osmosis membrane module 20 may include a plurality of membranes, raw water to be filtered by the reverse osmosis membrane module 20 may enter the reverse osmosis membrane module 20 from the water inlet 21 at the second end 40, the filtered pure water flows to the central tube 10 and flows out of the reverse osmosis membrane element 100 from the central tube, and the concentrated water flows out of the first water outlet 22. Similarly, as shown in fig. 2, the water inlet 21 of the reverse osmosis membrane module 20 may be disposed near the central tube 10 at the second end 40, the first water outlet 22 may be disposed far from the central tube 10 at the first end 30, and the positional relationship between the water inlet 21 and the first water outlet 22 that are distributed in a staggered manner is also within the protection scope of the present application.

Concentrated water can form concentration polarization in the reverse osmosis membrane assembly 20, wherein the concentration polarization means that in the process of filtration and separation, solution in raw water permeates through a reverse osmosis membrane under the drive of pressure, solute (ions or solutes with different molecular weights) in the solution is intercepted, the concentration is gradually increased in the interface of the membrane and the body solution or the area close to the interface of the membrane, and the solute is diffused to the body solution from the membrane surface under the action of concentration gradient to form a boundary layer, so that the fluid resistance and the local osmotic pressure are increased, and the filtration capacity of the membrane is reduced.

According to the reverse osmosis membrane module 20 of the embodiment of the utility model, the water inlet 21 and the first water outlet 22 are respectively arranged at two ends of the reverse osmosis membrane module 20, and the water inlet 21 and the first water outlet 22 are distributed in a staggered manner, so that the reverse osmosis membrane module 20 is convenient to flush raw water and the reverse osmosis membrane module 20 is convenient to fully filter the raw water. Meanwhile, the water flow entering the reverse osmosis membrane assembly 20 can form scouring on the central tube 10, so that the phenomenon that dirt adheres to the surface of the central tube 10 to block a flow channel of pure water after the reverse osmosis membrane assembly 20 is used for a long time is avoided, accumulation of salt on the surface of a reverse osmosis membrane is reduced, the filtering efficiency of the reverse osmosis membrane element 100 is improved, and the service life of the reverse osmosis membrane assembly 20 is prolonged.

In some embodiments, as shown in fig. 1, the first water outlet 22 is located at a side of the first end 30 close to the central tube 10, and the water inlet 21 is located at a side of the second end 40 away from the central tube 10, so that raw water enters at a side of the second end 40 away from the central tube 10 and exits from a side of the first end 30 close to the central tube 10, on one hand, the time for raw water to flow inside the reverse osmosis membrane element 100 can be increased, and thus filtration can be more sufficient, and the utilization rate of the reverse osmosis membrane module 20 can be improved. Meanwhile, due to the fact that pollutants are easily arranged at the position of the central tube 10, the pollutants can be prevented from being accumulated, and the filtering effect is further guaranteed.

With reference to fig. 2, the first water outlet 22 may be located at one side of the first end 30 away from the central tube 10, and the water inlet 21 may be located at one side of the second end 40 close to the central tube 10, so that the first water outlet 22 and the water inlet 21 are staggered, the time for raw water to flow inside the reverse osmosis membrane element 100 may be increased, and further, the filtration may be more sufficient, and the utilization rate of the reverse osmosis membrane module 20 may be improved.

From this, water inlet 21 and first delivery port 22 distribute at reverse osmosis membrane piece subassembly 20 both ends, and one in water inlet 21 and the first delivery port 22 is close to center tube 10 and sets up, another keeps away from center tube 10 and sets up, so that water inlet 21 and first delivery port 22 realize staggering the setting, increase the raw water and get into the inside flow path of reverse osmosis membrane piece subassembly 20, so that the reverse osmosis membrane piece fully filters the raw water, realize the washing away to the reverse osmosis membrane piece simultaneously, avoid piling up of concentration to lead to reverse osmosis membrane piece surface to form the sediment and reduce the filter effect.

Further, as shown in fig. 6, the reverse osmosis membrane element 100 further includes a second water outlet 23, and the second water outlet 23 is formed on the side of one side of the reverse osmosis membrane module 20. Concentration is generally easier to accumulate near the opposite end of the second end 40 where the first water outlet 22 is located (i.e., near the second water outlet 23 in fig. 6) due to the influence of the shape of the reverse osmosis membrane and the direction of the water flow, and thus, the second water outlet 23 is located at the position to increase the fluidity of the water flow in the region where the second water outlet 23 is located, reduce the concentration of the concentrated water in the region, avoid concentration polarization, reduce the possibility of scaling phenomenon on the membrane surface in the region, and increase the service life of the reverse osmosis membrane assembly 20. In more detail, as shown in fig. 6, the second water outlet 23 is formed on the side of one side of the reverse osmosis membrane assembly 20 adjacent to the first end 30. In the unfolded state of the reverse osmosis membrane module 20, a second water outlet 23 is opened at a side of the reverse osmosis membrane module 20 away from the central tube 10, and the second water outlet 23 is close to the first end 30 at the side, and the second water outlet 23 and the water inlet 21 may be oppositely disposed. Thus, by locating the second water outlet 23 adjacent the first end 30 on the side of one of the sides of the reverse osmosis membrane module 20, the flow of concentrate in this region can be increased, reducing the effect of the build-up of concentrate on the reverse osmosis membrane.

In some embodiments, as shown in fig. 6, the reverse osmosis membrane element 100 further comprises: a plurality of sealing strips, the plurality of sealing strips comprising: a first sealing strip 24 and a second sealing strip 25, the first sealing strip 24 being provided at the first end 30, the second sealing strip 25 being provided on the side of one of the sides of the ro membrane module 20, the first sealing strip 24 and the second sealing strip 25 together defining a second water outlet 23.

The first sealing strip 24 and the second sealing strip 25 partially seal the reverse osmosis membrane module 20 at the first end 30 and the side edge of the reverse osmosis membrane respectively, and a second water outlet 23 is defined between the end of the first sealing strip 24 far away from the central tube 10 and the second sealing strip 25.

Further, as shown in fig. 1 and 6, the sealing strip further comprises a third sealing strip 26, the third sealing strip 26 is sealed at the second end 40, and an end of the third sealing strip 26 away from the central tube 10 and the second sealing strip 25 define the water inlet 21 together.

In some embodiments, as shown in FIG. 6, the first water outlet 22 is located on a side of the third sealing strip 26 remote from the second water outlet 23.

It can be understood that, since the reverse osmosis membrane module 20 can be formed by stacking a plurality of sub-membrane sheets, after being wound around the central tube 10, the reverse osmosis membrane module 20 can be glued at a portion of the first end 30 away from the central tube 10 along the radial direction of the central tube 10, glued at a portion of the second end 40 close to the central tube 10, glued at a portion of the outermost layer of the reverse osmosis membrane module 20 close to the second end 40 along the axial direction of the central tube 10, the glued first end 30 is formed with the first sealing strip 24, and the glued second end 40 is formed with the third sealing strip 26. The first, second and third sealing strips 24, 25, 26 and the central tube 10 define an inlet 21, a first outlet 22 and a second outlet 23. The water inlet 21 may also be disposed at a side of the second end 40 close to the central tube 10, and the forming process and method are the same as those of the above-mentioned embodiment, and will not be described again.

From this, set up a plurality of sealing strips on reverse osmosis membrane module 20, inject the size and the position of water inlet 21, first delivery port 22 and second delivery port 23 to inject the flow path and the speed control of raw water, so that the raw water flows according to predetermined flow channel, increases the velocity of flow that the raw water got into reverse osmosis membrane module 20, increases the scouring strength to the reverse osmosis membrane piece, reduces dense water scale deposit on reverse osmosis membrane piece, improves reverse osmosis membrane module 20's filter capacity, thereby improves user's use impression. Meanwhile, the water inlet 21 and the first water outlet 22 are distributed in a staggered manner, so that the retention time of raw water in a slow flowing area in the reverse osmosis membrane module 20 can be avoided, and the flowability of concentrated water in the area can be increased by increasing the second water outlet 23.

Of course, the first, second and third sealing strips may also be processed during the winding process, for example, the first end 30, the second end 40 and part of the side edge of one of the sides of the reverse osmosis membrane assembly 20 may also be sealed by means of tape or film.

Furthermore, in some embodiments, as shown in fig. 3 and 11, the reverse osmosis membrane element 100 may further include a third water outlet 29, the third water outlet 29 being formed at the first end 30 and spaced apart from the first water outlet 22; the third water outlet 29 may be disposed opposite to the water inlet 21. As shown in fig. 11, the raw water entering from the water inlet 21 can exit from the first water outlet 22, the third water outlet 29, and the second water outlet 23, respectively. Therefore, the first water outlet 22 and the second water outlet 23 can increase the water flow of the connection area of the first sealing strip 24 and the second sealing strip 25, the water flowing from one side of the third sealing strip 26 to one side of the first sealing strip 24 and the water flowing from the water inlet 21 to the second sealing strip 25 are prevented from impacting and rotating at the second water outlet 23, the speed of reducing the concentration of the concentrated water at the second water outlet 23 is reduced, the speed of converging the concentrated water in different directions in partial areas to interfere the outflow of the concentrated water is reduced, and the concentration polarization can be effectively reduced. Because the central tube 10 is prone to contamination, the third water outlet 29 at the central tube 10 can prevent contamination from accumulating and reduce the flow of pure water flowing into the central tube 10. Certainly, the second water outlet 23 and the third water outlet 29 can be arranged according to actual requirements without limitation, so that concentration polarization can be pertinently reduced, the structural strength of the first sealing strip 24 or the second sealing strip 25 is improved, and the reliability of the reverse osmosis membrane module 20 is improved.

Of course, the third water outlet 29 may be formed on the side of the reverse osmosis membrane module 20 and spaced apart from the second water outlet 23, so that the concentration polarization can be specifically reduced. Alternatively, the number of the third water outlets 29 may be multiple, wherein a part of the third water outlets 29 is formed at the first end 30 and spaced apart from the first water outlet 22, and another part of the third water outlets 29 may also be formed on the side of the reverse osmosis membrane module 20 and spaced apart from the second water outlet 23, which is not limited herein.

In some embodiments, as shown in fig. 4 and 7, the reverse osmosis membrane element 100 further comprises a flow guide 27, wherein the flow guide 27 is used for guiding the liquid flowing in from the water inlet 21 to the first water outlet 22, or the flow guide 27 is used for guiding the liquid flowing in from the water inlet 21 to at least one of the first water outlet 22 and the second water outlet 23.

For example, here, taking the diversion element 27 as an example to guide the raw water at the water inlet 21 to the first water outlet 22, the water inlet 21 is far away from the central tube 10, the first water outlet 22 is close to the central tube 10, when the raw water enters the reverse osmosis membrane module 20 from the water inlet 21, under the action of the diversion element 27, the speed of the filtered water flowing to the first water outlet 22 is increased, the reverse osmosis membrane module can impact the reverse osmosis membrane by using a faster flow rate while filtering the raw water, so as to avoid scaling in the long-term use of the reverse osmosis membrane module 20, increase the water flow in the area where the diversion element 27 is located, reduce the accumulation of concentrated water, and increase the service life of the reverse osmosis membrane.

Referring to fig. 9 and 12, the diversion member 27 is opposite to the water inlet 21, i.e. the water inlet 21 is disposed near the central tube 10 at the second end 40, and the diversion member 27 is disposed near the central tube 10 and bends from the water inlet 21 toward the first water outlet 22, so as to guide the incoming water flow to the first water outlet 22.

In some embodiments, as shown in fig. 4 and 9, a flow guide 27 is provided at the junction of the first end 30 and the side of one of the sides of the ro membrane assembly 20. From this, the junction of first sealing strip 24 and second sealing strip 25 is located to water conservancy diversion piece 27, and one end sets up towards water inlet 21, and the other end sets up towards first delivery port 22, and the raw water of being convenient for to get into can fully and reverse osmosis membrane fully contact, improves reverse osmosis membrane's utilization ratio, and water inlet 21 setting is kept away from to water conservancy diversion piece 27, can increase the mobility of this regional internal water, slows down the concentration polarization in the region.

In some embodiments, as shown in fig. 7, the flow guide 27 has an arc segment, the arc segment has a radius of R in a circle, and R satisfies: r is more than or equal to 60mm and less than or equal to 75 mm. For example, R ═ 67 mm. Therefore, when the water impacts the flow guide piece 27, the concentration of the concentrated water in the area can be reduced to the maximum extent, the water flow in the area is accelerated, and the phenomenon that the passing performance of the reverse osmosis membrane filtering channel is influenced by dirt formed due to the fact that the concentrated water exists for too long time due to too high concentration is avoided.

In some embodiments, as shown in fig. 8 and 10, the reverse osmosis membrane element 100 further comprises: and the guide plates 28 are arranged in the water inlet 21 side by side at intervals, and the guide plates 28 incline towards the first water outlet 22 from the second end 40 to the first end 30. From this, a plurality of guide plates interval sets up in the outlet port, and every guide plate inclines from water inlet 21 towards first delivery port 22, so that the raw water gets into in the slope when getting into reverse osmosis membrane piece subassembly 20 is inside, reduce the water yield of the first sealing strip 24 of flow direction and the junction of second sealing strip 25, increase the area of contact of raw water and reverse osmosis membrane piece and the speed of flow direction reverse osmosis membrane piece, be favorable to reverse osmosis membrane piece subassembly 20 to the filtration of raw water, reduce the accumulation of the concentrated water concentration of center tube 10 and third sealing strip 26 junction, reduce the possibility of concentrated water scale deposit on reverse osmosis membrane piece, the life of extension reverse osmosis membrane piece subassembly 20.

In some embodiments, as shown in fig. 8 and 13, the angle of inclination of the guide plate 28 in the direction from the second end 40 to the first end 30 is x, x satisfying: x is more than or equal to 20 degrees and less than or equal to 70 degrees. Therefore, the inclined angle of the guide plate 28 is limited, the flow rate of raw water entering the reverse osmosis membrane assembly 20 can be utilized to the maximum degree, the reverse osmosis membrane is convenient to flush, and the consumption of flushing force in the reverse osmosis membrane assembly 20 is avoided.

In some embodiments, the ratio of the inner diameter of the water inlet 21 to the length of the second end 40 is a, a satisfying: a is more than or equal to 0.05 and less than or equal to 0.35. For example, B is greater than or equal to 0.1 and less than or equal to 0.32, further, B is 0.2, the length of the second end 40 refers to the length of the reverse osmosis membrane module 20 along the winding direction after being unfolded, and the ratio of the lengths of the water inlet 21 and the second end 40 is controlled, so that when raw water outside the reverse osmosis membrane module 20 enters the water inlet 21, the aperture is reduced, the flow rate of the raw water entering the reverse osmosis membrane module 20 is increased, the force for flushing the reverse osmosis membrane is higher, and the flushing effect is better.

In some embodiments, the ratio of the inner diameter of the first outlet 22 to the length of the second end 40 is B, which satisfies: b is more than or equal to 0.05 and less than or equal to 0.35. For example, B is 0.1 ≦ B ≦ 0.32, and further, B is 0.2, so that the concentrated water filtered by the reverse osmosis membrane can rapidly flow out by controlling the ratio of the inner diameter of the first water outlet 22 to the length of the second end 40, thereby increasing the flow capacity of the reverse osmosis membrane module 20.

In some embodiments, the ratio of the inner diameter of the second water outlet 23 to the length of the side of the reverse osmosis membrane assembly 20 on the one side is C, and C satisfies: c is more than or equal to 0.01 and less than or equal to 0.1. For example, C is 0.03 ≦ C ≦ 0.08, and further, C is 0.2, by controlling the ratio of the inner diameter of the first water outlet 22 to the length of the second end 40, the concentrated water filtered by the reverse osmosis membrane can rapidly flow out, and the flow capacity of the reverse osmosis membrane assembly 20 is increased.

A filtration apparatus according to an embodiment of the second aspect of the utility model comprises a reverse osmosis membrane element 100 according to any one of the embodiments described above.

Referring to fig. 1 to 13, the reverse osmosis element includes a central tube 10 and a reverse osmosis membrane module 20, the reverse osmosis membrane module 20 is wound around the central tube 10, a first end 30 of the reverse osmosis membrane module on a side close to the central tube 10 is provided with a first water outlet 22, a second end 40 of the reverse osmosis membrane module on a side far from the central tube 10 is provided with a water inlet 21, and the water inlet 21 and the first water outlet 22 are distributed in a staggered manner. A second water outlet 23 can be additionally arranged on the side of the reverse osmosis membrane assembly 20 opposite to the central tube 10, sealing strips are respectively arranged on three sides of the reverse osmosis membrane assembly 20 not in contact with the central tube 10, a first sealing strip 24 is formed at the first end 30, a third sealing strip 26 is formed at the second end 40, a second sealing strip 25 is formed on one side far away from the central tube 10, a second water outlet 23 is defined between the first sealing strip 24 and the second sealing strip 25, a first water outlet 22 is defined between the first sealing strip 24 and the central tube 10, a water inlet 21 is defined between the second sealing strip 25 and the third sealing strip 26, and the water inlet 21 and the first water outlet 22 are distributed in a staggered manner in the direction of the central axis of the central tube 10. The sealing strip may be formed by gluing the reverse osmosis membrane module 20 and the central tube 10 after being wound in a corresponding sealing area, or sealing the reverse osmosis membrane module by using an adhesive tape, a film or the like, or directly adding a sealing strip in the sealing strip area to prevent raw water from entering the reverse osmosis membrane module 20 from the sealing strip area.

A plurality of guide plates 28 can be arranged in the water inlet 21, the guide plates 28 are arranged at intervals between the water inlet 21 and incline from the water inlet 21 to the first water outlet 22, so that raw water can directly form scouring on the reverse osmosis membrane after entering the interior of the reverse osmosis membrane assembly 20, and accumulation of concentrated water concentration is reduced. In addition, a flow guide element 27 can be further arranged inside the reverse osmosis membrane assembly 20, one end of the flow guide element 27 faces the water inlet 21, the other end of the flow guide element 27 faces the first water outlet 22, and the flow guide element 27 is bent from the water inlet 21 to the first water outlet 22, so that part of the entering water flows along an area enclosed by the flow guide element 27, the first sealing strip 24 and the second sealing strip 25, the water mobility of the area is improved, the concentration accumulation of concentrated water is reduced, the concentration polarization is slowed, and the service life of the reverse osmosis membrane assembly 20 is prolonged.

Inside the reverse osmosis membrane element 100, the raw water entering from the water inlet 21 flows from the second end 40 to the first end 30, and due to the staggered distribution between the water inlet 21 and the first water outlet 22, after the raw water enters the reverse osmosis membrane and is filtered, the formed pure water can flow into the central tube 10 from the through hole formed in the tube wall of the central tube 10 and flow out from the end of the central tube 10, and the formed concentrated water flows out from the first end 30 along the reverse osmosis membrane. In the process of filtering the raw water by the reverse osmosis membrane assembly 20, the water flow speed of a part of concentrated water is reduced in a region where the first sealing strip 24 is connected with the second sealing strip 25 due to the first sealing strip 24 and the second sealing strip 25, the concentration of the concentrated water in the region can be gradually increased along with the increase of time and the increase of the using times of the reverse osmosis membrane assembly 100, dirt is formed on the reverse osmosis membrane, the filtering capacity of the reverse osmosis membrane is reduced, and the concentration of the part of concentrated water can be reduced by arranging the second water outlet 23 in the region, so that the possibility of scaling phenomenon is reduced.

From this, the filter equipment who has this reverse osmosis membrane element 100 can increase the raw water at the inside velocity of flow of reverse osmosis membrane piece, increase the inside water of reverse osmosis membrane piece and to the scouring force degree of reverse osmosis membrane piece, reduce the possibility that forms the dirt on the membrane piece, simultaneously, the second delivery port 23 that adds can effectively avoid dense water to rise at this regional concentration, so that this regional dense water of part can discharge fast, reduce the inside concentration polarization of reverse osmosis membrane piece subassembly 20, increase filter equipment's life, use cost is reduced.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the utility model and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the utility model.

In the description of the present invention, "the first feature" and "the second feature" may include one or more of the features. In the description of the present invention, "a plurality" means two or more. In the description of the present invention, the first feature being "on" or "under" the second feature may include the first and second features being in direct contact, and may also include the first and second features being in contact with each other not directly but through another feature therebetween. In the description of the utility model, "above", "over" and "above" a first feature in a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.

While embodiments of the utility model have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the utility model, the scope of which is defined by the claims and their equivalents.

Claims

1. A reverse osmosis membrane element, comprising:

a central tube;

a reverse osmosis membrane module wound on the central tube, the reverse osmosis membrane module being formed with a first water outlet and at least one water inlet,

the two ends of the reverse osmosis membrane assembly opposite to each other in the axial direction of the central tube are respectively a first end and a second end,

the first end is provided with the first water outlet, the second end is provided with the water inlet, and the first water outlet and the water inlet are arranged in a staggered mode in the direction from the second end to the first end.

2. The reverse osmosis membrane element of claim 1, wherein the first water outlet is located on a side of the first end proximal to the central tube and the water inlet is located on a side of the second end distal to the central tube, or

The first water outlet is located on one side, far away from the central pipe, of the first end, and the water inlet is located on one side, close to the central pipe, of the second end.

3. The reverse osmosis membrane element of claim 1,

and the reverse osmosis membrane assembly further comprises a second water outlet which is formed on the side edge of one side of the reverse osmosis membrane assembly.

4. A reverse osmosis membrane element according to claim 3,

the first end of the water inlet pipe is provided with a first water outlet, and the first water outlet is formed at the first end of the water inlet pipe; and/or

5. The reverse osmosis membrane element of claim 3, wherein the second water outlet is formed on a side of the one side of the reverse osmosis membrane assembly adjacent the first end.

6. The reverse osmosis membrane element of claim 3, further comprising: a plurality of sealing strips, a plurality of said sealing strips comprising:

a first sealing strip and a second sealing strip, wherein the first sealing strip is arranged at the first end, the second sealing strip is arranged on the side edge of one side of the reverse osmosis membrane assembly,

the first sealing strip and the second sealing strip together define the second water outlet.

7. The reverse osmosis membrane element of claim 6, wherein the sealing strip further comprises:

a third sealing strip sealed at the second end, the third sealing strip and the second sealing strip together defining the water inlet.

8. The reverse osmosis membrane element of claim 7, wherein the first water outlet is located on a side of the third sealing strip distal from the second water outlet.

9. The reverse osmosis membrane element of claim 1, further comprising a flow guide for guiding liquid flowing in from the water inlet to the first water outlet.

10. The reverse osmosis membrane element of claim 9, wherein the flow guide is disposed at a junction of the first end and a side of one of the sides of the reverse osmosis membrane module.

11. The reverse osmosis membrane element of claim 10, wherein the flow guide member has an arcuate segment having a radius on a circle of R, wherein R satisfies: r is more than or equal to 60mm and less than or equal to 75 mm.

12. The reverse osmosis membrane element of claim 1, further comprising: a plurality of guide plates which are arranged in the water inlet side by side at intervals,

the guide plate is inclined toward the first water outlet in a direction from the second end to the first end.

13. The reverse osmosis membrane element of claim 12, wherein the guide plate is inclined at an angle x in a direction from the second end to the first end, the angle x satisfying: x is more than or equal to 20 degrees and less than or equal to 70 degrees.

14. The reverse osmosis membrane element of any one of claims 1-13, further comprising a second water outlet, wherein the ratio of the inner diameter of the water inlet to the length of the second end is a, wherein a satisfies: a is more than or equal to 0.05 and less than or equal to 0.35; and/or

The ratio of the inner diameter of the first water outlet to the length of the second end is B, and B satisfies the following conditions: b is more than or equal to 0.05 and less than or equal to 0.35; and/or

The ratio of the inner diameter of the second water outlet to the length of the side edge of one side of the reverse osmosis membrane assembly is C, and C satisfies the following conditions: c is more than or equal to 0.01 and less than or equal to 0.1.

15. A filtration apparatus comprising a reverse osmosis membrane element according to any one of claims 1-14.