Water inlet separation net, reverse osmosis membrane unit, reverse osmosis membrane element, filter element and filter system

Abstract

The utility model relates to a water inlet separation net, a reverse osmosis membrane unit, a reverse osmosis membrane element, a filter element and a filter system in the technical field of reverse osmosis membranes. The reverse osmosis membrane unit comprises a water inlet separation net body and a reverse osmosis membrane attached to the reverse osmosis membrane element, the water inlet separation net body is provided with water blocking parts which are arranged at intervals and in a staggered mode in the extending direction of the water inlet separation net body, so that the water inlet separation net forms a water diversion flow channel which is continuously bent; and the distance between every two adjacent water blocking parts is reduced in sequence. The water diversion flow channel is designed to be bent, and the distance between every two adjacent water blocking parts is sequentially reduced, so that the flow speed of raw water is gradually increased, on the basis that the water diversion flow channel is designed to be relatively long, the flow speed of the raw water can be maintained to be gradually increased, the raw water spirally flows in the water diversion flow channel, and the flow area of the raw water is gradually reduced; the shear flow velocity of the concentrated water end is improved, and concentration polarization caused by poor water quality of the concentrated water end is weakened, so that the reverse osmosis membrane can more effectively resist pollution and blockage.

Description

TECHNICAL FIELD

[0001] The utility model relates to reverse osmosis membrane technical field especially, relate to a water inlet screen, reverse osmosis membrane unit, reverse osmosis membrane element, filter core and filtration system. BACKGROUND

[0002] In the reverse osmosis element related technology, the current roll type reverse osmosis membrane element is sealed and connected by winding the water inlet screen, the reverse osmosis membrane sheet and the pure water guide cloth on the center water production pipe.In the water production process, raw water enters from one end surface of the reverse osmosis membrane element, part of the raw water forms pure water on the back of the membrane sheet under pressure, the pure water is collected from one end or two ends along the pure water guide cloth through the center pipe, and the other part of the raw water forms concentrated water and flows out from the other end surface of the membrane element along the water inlet screen.Under normal circumstances, the flow rate of the final concentrated water end is generally 20% to 70% of the raw water inlet flow rate.Because the raw water inlet flow rate gradually decreases along the flow channel direction, the membrane surface flow rate decreases, the flow process is short, and the concentration difference polarization phenomenon of the reverse osmosis membrane on the concentrated water side intensifies, and the service life of the reverse osmosis membrane element is shortened. SUMMARY

[0003] The technical problem to be solved by the utility model is that the existing reverse osmosis membrane raw water inlet flow rate is low and the flow process is short, which leads to the intensification of the concentration difference polarization phenomenon of the reverse osmosis membrane on the concentrated water side and the shortening of the service life of the reverse osmosis membrane element, and therefore a water inlet screen, a reverse osmosis membrane unit, a reverse osmosis membrane element, a filter core and a filtration system are provided.

[0004] The utility model provides a water inlet screen applied to a reverse osmosis membrane element, which comprises:

[0005] A water inlet screen body is used for being attached to a reverse osmosis membrane sheet in the reverse osmosis membrane element.

[0006] The water inlet screen body has water blocking parts that are spaced and staggered along the extension direction of the water inlet screen body, so that the water inlet screen forms a continuously bent water guide flow channel.

[0007] The spacing between adjacent two water blocking parts decreases in turn.

[0008] In some embodiments, the water blocking part is a glue line that attaches the water inlet screen body to the reverse osmosis membrane sheet.

[0009] In some embodiments, the water guide flow channel comprises a plurality of water guide sub-flow channels.

[0010] The plurality of water guide sub-flow channels are designed such that the water inlet has different flow directions in adjacent two water guide sub-flow channels, and the plurality of water guide sub-flow channels are sequentially connected along the water inlet flow direction.

[0011] The flow area of ​​the plurality of water diversion channels decreases sequentially along the direction of water inflow.

[0012] In some embodiments, the plurality of water diversion channels enable the incoming water to flow in an S-shape within the inlet mesh.

[0013] In some embodiments, a reverse osmosis membrane unit is provided, comprising:

[0014] A reverse osmosis membrane has a first side and a second side that are opposite to each other.

[0015] An inlet screen is sandwiched between the first surfaces of the two layers of the reverse osmosis membrane to form a water inlet channel with the reverse osmosis membrane; the inlet screen is the aforementioned inlet screen.

[0016] Pure water flow guide cloth is disposed on the second side of the reverse osmosis membrane.

[0017] In some embodiments, a reverse osmosis membrane element is provided, comprising:

[0018] Central tube;

[0019] The aforementioned reverse osmosis membrane unit;

[0020] In this embodiment, multiple reverse osmosis membrane units are wound around the outside of the central tube in order from near to far from the central tube. The reverse osmosis membrane element has a first end and a second end that are axially opposite each other. A circumferential seal is provided on the outer peripheral surface of the first end and the outer peripheral surface of the second end. A first radial seal is provided on the end face of the first end and a second radial seal is provided on the end face of the second end.

[0021] The portion of the end face of the first end that does not cover the first radial seal forms the raw water inlet, and the portion of the end face of the second end that does not cover the second radial seal forms the concentrated water outlet.

[0022] A pure water outlet is formed between the two circumferential seals.

[0023] In some embodiments, in the radial direction of the central pipe, the length of the inlet screen body is L, the length of the raw water inlet is L1, and the length of the concentrate outlet is L2;

[0024] Where L / 15≤L2<L1≤L / 2.

[0025] In some embodiments, the plurality of water diversion channels in the water diversion channel include a first water diversion channel, a second water diversion channel and a third water diversion channel, wherein the width of the first water diversion channel is H1, the width of the second water diversion channel is H2, and the width of the third water diversion channel is H3.

[0026] Among them, L1≥H1>H2>H3≥L2.

[0027] In some embodiments, the end face of the first end and the end face of the second end are both constructed as annular surfaces;

[0028] Both the first radial seal and the second radial seal are constructed as annular sealing walls;

[0029] The pure water outlet is configured as a strip-shaped opening extending axially along the central tube;

[0030] Wherein, the annular diameter of the end face of the first end and the end face of the second end are both R, the annular diameter of the first radial seal is r1, the annular diameter of the second radial seal is r2, and R-r1>R-r2.

[0031] In some embodiments, the two end sidewalls and the peripheral sidewalls of the central tube are all constructed as closed walls.

[0032] In some embodiments, a filter element includes:

[0033] The aforementioned reverse osmosis membrane element.

[0034] In some embodiments, a filtration system is provided, comprising:

[0035] The above-mentioned filter element.

[0036] The solution provided by this utility model has the following advantages compared with the prior art:

[0037] By incorporating water-blocking sections on the inlet screen body, using adhesive strips, these sections create a curved water-guiding channel between the inlet screen body and the reverse osmosis membrane, while also providing a secure bond between them. Without adding additional components, the staggered arrangement of these water-blocking sections forms the curved water-guiding channel. Raw water enters from the inlet screen body and flows along this curved channel, extending its flow path and increasing its flow time within the channel. This, in turn, increases the contact time between the raw water and the reverse osmosis membrane, improving the overall filtration efficiency of the reverse osmosis membrane unit. Furthermore, under a constant raw water flow rate, the distance between adjacent water-blocking sections... As the spacing decreases sequentially, the flow rate of the raw water gradually increases. With a relatively long water inlet channel, the raw water flow rate can be maintained at a gradually increasing level. The raw water flows spirally in the water inlet channel, and the flow area of ​​the raw water gradually decreases. The shear velocity at the concentrate end is increased, which reduces the concentration polarization caused by the poor water quality at the concentrate end. To a certain extent, this slows down the concentration polarization phenomenon on the surface of the reverse osmosis membrane, effectively alleviates the fouling on the surface of the reverse osmosis filter element, and slows down the scaling rate. In this embodiment, the inlet screen is designed with a water-blocking part to increase the flow rate on the surface of the reverse osmosis membrane, so that the reverse osmosis membrane can more effectively resist fouling and clogging, thereby extending the service life of the reverse osmosis membrane unit and the overall reverse osmosis membrane element. Attached Figure Description

[0038] The accompanying drawings, as part of this utility model, are used to provide a further understanding of the present utility model. The illustrative embodiments and descriptions of the present utility model are used to explain the present utility model, but do not constitute an undue limitation of the present utility model. Obviously, the drawings described below are merely some embodiments; those skilled in the art can obtain other drawings based on these drawings without creative effort. In the drawings:

[0039] Figure 1 This is a cross-sectional view of the inlet mesh body shown in an embodiment of the present invention;

[0040] Figure 2 This is one of the structural schematic diagrams of the reverse osmosis membrane element shown in the embodiments of this utility model;

[0041] Figure 3 This is the second schematic diagram of the reverse osmosis membrane element shown in this embodiment of the present invention;

[0042] Figure 4 This is one of the structural side views of the reverse osmosis membrane element shown in the embodiments of this utility model;

[0043] Figure 5 This is a second side view of the structure of the reverse osmosis membrane element shown in this embodiment of the present invention;

[0044] Figure 6This is the third side view of the structure of the reverse osmosis membrane element shown in this embodiment of the present invention;

[0045] Figure 7 This is a top view of the reverse osmosis membrane element shown in an embodiment of the present invention.

[0046] In the diagram: 1-Reverse osmosis membrane, 2-Inlet water separator body, 201-Water inlet channel, 2011-First water inlet channel, 2012-Second water inlet channel, 2013-Third water inlet channel, 202-Raw water inlet, 203-Concentrate outlet, 3-Pure water guide cloth, 4-Water blocking part, 5-Central tube, 6-Glue line, 7-Pure water outlet, 8-First radial seal, 9-Second radial seal, 10-Circumferential seal.

[0047] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the present invention in any way, but rather to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0048] In the description of this utility model, it should be noted that the terms "inner" and "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0049] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "contact," and "communication" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0050] The existing reverse osmosis membrane has a low feed water flow rate and a short flow path, which exacerbates the concentration polarization phenomenon on the concentrate side of the reverse osmosis membrane and shortens the lifespan of the reverse osmosis membrane element.

[0051] Based on this, the following embodiments are proposed.

[0052] Example 1

[0053] like Figure 1 , 2 As shown, this embodiment provides an inlet screen for a reverse osmosis membrane element, comprising:

[0054] The inlet screen body 2 is used to attach the reverse osmosis membrane sheet 1 in the reverse osmosis membrane element;

[0055] The inlet screen body 2 has water-blocking parts 4 that are spaced apart and staggered along the extension direction of the inlet screen body 2, so that the inlet screen forms a continuously bending water diversion channel.

[0056] The distance between two adjacent water-blocking parts 4 decreases sequentially.

[0057] Preferably, the water-blocking part 4 is an adhesive strip on which the water inlet mesh body 2 is attached to the reverse osmosis membrane 1.

[0058] In this embodiment, the extending direction of the inlet screen body 2 is consistent with the axial direction of the central tube 5 when the inlet screen body 2 is assembled with the central tube 5 in the reverse osmosis membrane element. The water-blocking part 4 is made of adhesive strip. The adhesive strip can form a curved water-guiding channel between the inlet screen body 2 and the reverse osmosis membrane 1, and can also play a role in fixing and bonding the inlet screen body 2 and the reverse osmosis membrane 1. Without adding additional components, the water-blocking parts 4 are staggered to form a curved water-guiding channel. Raw water enters from the inlet screen body 2 and flows along the curved water-guiding channel. The flow path of the raw water is extended, increasing the flow time of the raw water in the water-guiding channel, thereby increasing the contact time between the raw water and the reverse osmosis membrane 1 and improving the overall performance of the reverse osmosis membrane unit. The filtration efficiency is improved. Under the condition of a constant raw water flow rate, the distance between two adjacent water-blocking parts 4 decreases sequentially, and the flow velocity of the raw water gradually increases. With a relatively long water inlet channel design, the raw water flow velocity can be maintained to gradually increase. The raw water flows spirally in the water inlet channel and the flow area of ​​the raw water gradually decreases. The shear velocity at the concentrate end is improved, which weakens the concentration polarization caused by the poor water quality at the concentrate end. To a certain extent, it slows down the concentration polarization phenomenon on the surface of the reverse osmosis membrane 1, effectively alleviates the surface fouling of the reverse osmosis filter element membrane, and slows down the scaling rate. In this embodiment, the inlet screen is designed with water-blocking parts 4 to increase the surface flow velocity of the reverse osmosis membrane 1, so that the reverse osmosis membrane 1 can more effectively resist fouling and clogging, thereby extending the service life of the reverse osmosis membrane unit and the overall reverse osmosis membrane element.

[0059] Optionally, in one implementation of this embodiment, such as Figure 1 As shown,

[0060] The water diversion channel includes multiple water diversion channels 201;

[0061] The multiple water diversion channels 201 are designed such that the water in two adjacent water diversion channels 201 have different flow directions, and the multiple water diversion channels 201 are connected sequentially along the water flow direction.

[0062] The flow area of ​​the multiple water diversion channels 201 decreases sequentially along the direction of water inflow.

[0063] Preferably, the multiple water diversion channels 201 enable the incoming water to flow in an S-shape within the water inlet mesh.

[0064] In this embodiment, raw water enters from the inlet screen body 2 and flows along multiple water diversion channels 201. During the flow, the flow direction is continuously changed, thereby relatively extending the effective flow path length of the entire water diversion channel, increasing the flow time of the raw water in the water diversion channel, and thus increasing the contact time between the raw water and the reverse osmosis membrane 1, improving the overall water filtration efficiency of the reverse osmosis membrane unit. The flow area of ​​the multiple water diversion channels 201 is designed to decrease sequentially. The raw water flows in an S-shape along the winding direction of the inlet screen body 2 after entering the water diversion channel. Based on this, the raw water flow velocity V = Q / (l×T), where Q is the raw water flow rate, l is the width of the water diversion channel, T is the thickness of the water diversion channel, and l×T is the flow area of ​​the water diversion channel. Under the condition of a constant raw water flow rate, as the flow area of ​​the multiple water diversion channels 201 gradually decreases, the raw water flow velocity gradually increases. This is based on the relatively long design of the water diversion channels. At the same time, the raw water flow rate can be maintained to gradually increase. The raw water flows spirally in the water inlet channel and the flow area of ​​the raw water gradually decreases. The shear flow rate at the concentrate end is increased, which reduces the concentration polarization caused by the poor water quality at the concentrate end. To a certain extent, it slows down the concentration polarization phenomenon on the surface of the reverse osmosis membrane 1, effectively alleviates the surface fouling of the reverse osmosis filter membrane, and slows down the scaling rate. The inlet water baffle is designed with a water blocking part 4 to increase the surface flow rate of the reverse osmosis membrane 1, so that the reverse osmosis membrane 1 can resist fouling and clogging more effectively, thereby extending the service life of the reverse osmosis membrane unit and the overall reverse osmosis membrane element.

[0065] Example 2

[0066] like Figure 2 As shown, a reverse osmosis membrane unit includes:

[0067] The reverse osmosis membrane 1 has a first side and a second side facing each other;

[0068] An inlet screen is sandwiched between the first surfaces of two reverse osmosis membranes 1 to form a water inlet channel with the reverse osmosis membranes 1. The inlet screen is the inlet screen in Example 1.

[0069] Pure water flow guide cloth 3 is located on the second side of the reverse osmosis membrane 1.

[0070] In this embodiment, the inlet water separator body 2 is sandwiched between the folded reverse osmosis membrane sheets 1. The inlet water separator body 2 is fixedly clamped by the folded reverse osmosis membrane sheets 1, and the folded reverse osmosis membrane sheets 1 are attached between adjacent pure water guide cloths 3, such as... Figure 7 As shown, the pure water flow guide cloth 3 is provided with adhesive lines 6 to facilitate the bonding of the reverse osmosis membrane 1 and the pure water flow guide cloth 3.

[0071] Raw water enters through the inlet screen body 2 and flows along the curved water inlet channel. The flow path of the raw water is extended, increasing the flow time of the raw water in the water inlet channel, thereby increasing the contact time between the raw water and the reverse osmosis membrane 1 and improving the overall filtration efficiency of the reverse osmosis membrane unit. At the same time, under the condition of a certain raw water flow rate, the distance between two adjacent water blocking parts 4 decreases sequentially, so the flow velocity of the raw water will gradually increase. Based on the relatively long design of the water inlet channel, the flow velocity of the raw water can be maintained to gradually increase. The raw water flows spirally in the water inlet channel and the flow area of ​​the raw water gradually decreases. The shear velocity at the concentrate end is increased, which weakens the concentration polarization caused by the poor water quality at the concentrate end. To a certain extent, it alleviates the concentration polarization phenomenon on the surface of the reverse osmosis membrane 1, effectively alleviates the surface fouling of the reverse osmosis filter element membrane, and slows down the scaling rate. In this embodiment, the inlet screen, by designing water blocking parts 4, increases the surface flow velocity of the reverse osmosis membrane 1, so that the reverse osmosis membrane 1 can more effectively resist fouling and clogging, thereby extending the service life of the reverse osmosis membrane unit and the overall reverse osmosis membrane element.

[0072] Example 3

[0073] like Figures 2-6 As shown, this embodiment provides a reverse osmosis membrane element, including:

[0074] Central tube 5;

[0075] Multiple reverse osmosis membrane units;

[0076] In this embodiment, multiple reverse osmosis membrane units are wound around the outside of the central tube 5 in order from near to far from the central tube 5. The reverse osmosis membrane element has a first end and a second end that are opposite each other along the axial direction. A circumferential seal 10 is provided on the outer peripheral surface of the first end and the outer peripheral surface of the second end. A first radial seal 8 is provided on the end face of the first end and a second radial seal 9 is provided on the end face of the second end.

[0077] The portion of the end face of the first end that does not cover the first radial seal 8 forms the raw water inlet 202, and the portion of the end face of the second end that does not cover the second radial seal 9 forms the concentrated water outlet 203.

[0078] A pure water outlet 7 is formed between the two circumferential seals 10.

[0079] In this embodiment, the reverse osmosis membrane element is a spiral wound reverse osmosis membrane element, and the central tube 5 provides fixed support for multiple reverse osmosis membrane units composed of reverse osmosis membrane sheets 1, inlet water separator body 2, and pure water guide cloth 3.

[0080] Raw water enters through the raw water inlet 202 and flows along multiple water diversion channels 201. During the flow, the flow direction is constantly changed, which relatively extends the overall effective flow path length of the water diversion channel, increases the flow time of the raw water in the water diversion channel, and thus increases the contact time between the raw water and the reverse osmosis membrane 1, thereby improving the overall water filtration efficiency of the reverse osmosis membrane unit. By combining the design of multiple water intake channels 201 with gradually decreasing flow areas, under the condition of a constant raw water flow rate, the flow velocity of the raw water will gradually increase. With a relatively long water intake channel design, the raw water flow velocity can be maintained at a gradually increasing level. The raw water flows spirally in the water intake channel, and the flow area of ​​the raw water gradually decreases. The shear velocity at the concentrate end is increased, which reduces the concentration polarization caused by the poor water quality at the concentrate end. To a certain extent, this alleviates the concentration polarization phenomenon on the surface of the reverse osmosis membrane 1, effectively reduces surface fouling of the reverse osmosis membrane 1, and slows down the scaling rate. As a result, the reverse osmosis membrane element as a whole can more effectively resist fouling and clogging, thereby extending the overall service life of the reverse osmosis membrane element.

[0081] Raw water continuously enters from the raw water inlet 202, and the pure water filtered by the reverse osmosis membrane 1 is guided by the pure water guide cloth 3 to the pure water outlet 7 for discharge, while the concentrated water is discharged through the concentrated water outlet 203.

[0082] Optionally, in one implementation of this embodiment, such as Figure 1 As shown,

[0083] In the radial direction of the central pipe 5, the length of the inlet screen body 2 is L, the length of the raw water inlet 202 is L1, and the length of the concentrate outlet 203 is L2.

[0084] Where L / 15≤L2<L1≤L / 2.

[0085] In this embodiment, by limiting the relationship between the raw water inlet 202, the concentrated water outlet 203, and the total length of the inlet mesh body 2, the inlet flow rate of the raw water is moderate and matches the flow time of the raw water in the S-shaped water inlet channel, so that the raw water is better filtered and achieves high-efficiency filtration.

[0086] Optionally, in one implementation of this embodiment, such as Figure 1 As shown,

[0087] The multiple diversion channels 201 in the water diversion channel include a first diversion channel 2011, a second diversion channel 2012 and a third diversion channel 2013. The width of the first diversion channel 2011 is H1, the width of the second diversion channel 2012 is H2 and the width of the third diversion channel 2013 is H3.

[0088] Among them, L1≥H1>H2>H3≥L2.

[0089] In this embodiment, the widths of the first diversion channel 2011, the second diversion channel 2012, and the third diversion channel 2013 are gradually reduced. The raw water flow velocity V = Q / (l×T), where Q is the raw water flow rate, l is the width of the diversion channel, T is the thickness of the diversion channel, and l×T is the flow area of ​​the diversion channel. Under the condition that the raw water flow rate and the thickness of the diversion channel are constant, the gradual reduction in the width of the first diversion channel 2011, the second diversion channel 2012, and the third diversion channel 2013 will gradually increase the raw water flow velocity. This is based on the relatively long overall design of the diversion channels. Based on this, the raw water flow rate can be maintained and gradually increased. The raw water flows spirally in the water inlet channel and the flow area of ​​the raw water gradually decreases. The shear velocity at the concentrate end is increased, which weakens the concentration polarization caused by the poor water quality at the concentrate end. To a certain extent, this reduces the concentration polarization phenomenon on the surface of the reverse osmosis membrane 1, effectively alleviates surface fouling of the reverse osmosis filter element, and slows down the scaling rate. In this embodiment, the reverse osmosis membrane unit is designed to increase the surface flow rate of the reverse osmosis membrane 1 while optimizing the water inlet method and water inlet channel, so that the reverse osmosis membrane 1 can more effectively resist fouling and clogging, thereby extending the overall service life of the reverse osmosis membrane unit. At the same time, the widths of the first water inlet channel 2011, the second water inlet channel 2012, and the third water inlet channel 2013 are limited to be greater than the length L1 of the raw water inlet 202 and less than the length L2 of the concentrate outlet 203, so that the reverse osmosis membrane element has a suitable water inlet volume. During the flow of the water inlet channel, the water can be fully filtered by the reverse osmosis membrane 1.

[0090] Optionally, in one implementation of this embodiment, such as Figure 5 , 6 As shown,

[0091] Both the end face of the first end and the end face of the second end are constructed as annular surfaces;

[0092] Both the first radial seal 8 and the second radial seal 9 are constructed as annular sealing walls;

[0093] The pure water outlet 7 is configured as a strip-shaped opening extending axially along the central pipe 5;

[0094] Wherein, the annular diameter of the end face of the first end and the end face of the second end are both R, the annular diameter of the first radial seal 8 is r1, the annular diameter of the second radial seal 9 is r2, and R-r1>R-r2.

[0095] In this embodiment, in the reverse osmosis membrane element, the portion of the radial sealing surface on one side near the central tube 5 is sealed to form a first radial seal 8, with only the portion away from the central tube 5 reserved as the raw water inlet 202 for raw water to enter. The portion of the radial sealing surface on the other side away from the central tube 5 is sealed to form a second radial seal 9, with only the portion near the central tube 5 reserved as the concentrate outlet 203 for concentrate to be discharged, thereby achieving separation of raw water entry and concentrate discharge.

[0096] The pure water filtered by the reverse osmosis membrane 1 is discharged from the pure water outlet 7 on the circumferential surface of the pure water guide cloth 3 along the winding direction on the central tube 5. To facilitate the discharge of pure water, an outer shell can be set on the outermost layer of the reverse osmosis membrane element, and the pure water outlet 7 is directly connected to the outer shell, thus forming a pure water outlet 7 independent of the raw water inlet 202 and the concentrated water outlet 203, which facilitates the collection of pure water.

[0097] R-r1 > R-r2, ensuring that the area of ​​the raw water inlet 202 is larger than that of the concentrate outlet 203, thereby increasing the flow velocity at the concentrate outlet and further reducing concentration polarization.

[0098] Optionally, in one implementation of this embodiment, such as Figure 2 As shown,

[0099] The two end sidewalls and the peripheral sidewalls of the central tube 5 are all constructed as closed walls.

[0100] In this embodiment, the pure water filtered by the reverse osmosis membrane 1 is discharged from the pure water outlet 7 of the pure water guide cloth 3, replacing the original method of pure water being discharged from the central tube in the reverse osmosis membrane element. In this embodiment, the pure water is directly discharged from the pure water guide cloth 3. Since the pure water flow rate is higher in the area near the central tube, this discharge method can reduce the impact of the large back pressure in the area near the central tube 5 on the reverse osmosis membrane 1, and improve the water production efficiency of the reverse osmosis membrane unit to a large extent.

[0101] Meanwhile, the pure water outlet 7 is designed to extend along the axial direction of the central tube 5 on the pure water guide cloth 3, so that the pure water outlet 7 can be discharged from the peripheral side wall of the pure water guide cloth 3. The discharge area is relatively large, which further reduces the impact of the large back pressure in the area near the central tube 5 on the reverse osmosis membrane 1 and improves the water filtration efficiency of the reverse osmosis membrane element.

[0102] Example 4

[0103] This embodiment provides a filter element, including:

[0104] The reverse osmosis membrane element in Example 3.

[0105] The filter element provided in this embodiment also has the advantages of the reverse osmosis membrane element in Embodiment 3.

[0106] In Example 3, the reverse osmosis membrane 1 can be replaced with nanofiltration membrane, microfiltration membrane or other filter membrane structures as needed to form filter cartridges for different purposes.

[0107] Example 5

[0108] This embodiment provides a filtration system, including:

[0109] The filter element in Example 4.

[0110] Specifically, the filtration system also includes:

[0111] Raw water tank, concentrated water collection tank, pure water collection tank;

[0112] The raw water tank is connected to the raw water inlet 202, the concentrate collection tank is connected to the concentrate outlet 203, and the pure water collection tank is connected to the pure water outlet 7.

[0113] In this filtration system, raw water enters through the inlet screen body 2 and flows along the curved water inlet channel. The flow path of the raw water is extended, increasing the flow time of the raw water in the water inlet channel, thereby increasing the contact time between the raw water and the reverse osmosis membrane 1 and improving the overall filtration efficiency of the reverse osmosis membrane unit. At the same time, under the condition of a certain raw water flow rate, the distance between two adjacent water blocking parts 4 decreases sequentially, so the flow velocity of the raw water will gradually increase. Based on the relatively long design of the water inlet channel, the flow velocity of the raw water can be maintained to gradually increase. The raw water flows spirally in the water inlet channel and the flow area of ​​the raw water gradually decreases. The shear velocity at the concentrate end is increased, which weakens the concentration polarization caused by the poor water quality at the concentrate end. To a certain extent, it alleviates the concentration polarization phenomenon on the surface of the reverse osmosis membrane 1, effectively alleviates the surface fouling of the reverse osmosis filter element membrane, and slows down the scaling rate. In this embodiment, the inlet screen, by designing water blocking parts 4, increases the surface flow velocity of the reverse osmosis membrane 1, so that the reverse osmosis membrane 1 can more effectively resist fouling and clogging, thereby extending the service life of the reverse osmosis membrane unit and the overall reverse osmosis membrane element.

[0114] In summary, the ingenious design of the inlet screen and reverse osmosis membrane element lies in:

[0115] First, by setting water-blocking sections on the inlet screen body, using adhesive strips, these sections not only form a curved water-guiding channel between the inlet screen body and the reverse osmosis membrane, but also serve to fix and bond the inlet screen body and the reverse osmosis membrane together. Without adding any additional components, the water-blocking sections are staggered to form curved water-guiding channels. Raw water enters from the inlet screen body and flows along these curved channels, extending its flow path and increasing its flow time within the channels. This, in turn, increases the contact time between the raw water and the reverse osmosis membrane, improving the overall filtration efficiency of the reverse osmosis membrane unit. Simultaneously, under a constant raw water flow rate, the distance between adjacent water-blocking sections... As the spacing between the elements decreases sequentially, the flow velocity of the raw water gradually increases. With a relatively long water inlet channel, the raw water flow velocity can be maintained at a gradually increasing level. The raw water flows spirally in the water inlet channel, and the flow area of ​​the raw water gradually decreases. The shear velocity at the concentrate end is increased, which weakens the concentration polarization caused by the poor water quality at the concentrate end. To a certain extent, this reduces the concentration polarization phenomenon on the surface of the reverse osmosis membrane, effectively alleviates the fouling on the surface of the reverse osmosis filter element, and slows down the scaling rate. In this embodiment, the inlet screen is designed with a water-blocking part to increase the flow velocity on the surface of the reverse osmosis membrane, so that the reverse osmosis membrane can more effectively resist fouling and clogging, thereby extending the service life of the reverse osmosis membrane unit and the overall reverse osmosis membrane element.

[0116] Secondly, the sidewalls at both ends and the peripheral sidewalls of the central tube are designed as closed surfaces. The pure water filtered by the reverse osmosis membrane is discharged through the pure water outlet of the pure water guide cloth, replacing the original method where pure water was discharged through the central tube in the reverse osmosis membrane element. The pure water is directly discharged through the pure water guide cloth. Because the pure water flow velocity is higher near the central tube, this discharge method can reduce the impact of the high back pressure near the central tube on the reverse osmosis membrane 1, significantly improving the water production efficiency of the reverse osmosis membrane unit. Simultaneously, the pure water outlet is designed to extend along the axial direction of the central tube on the pure water guide cloth, allowing the pure water to be discharged from the peripheral sidewall of the pure water guide cloth. This results in a relatively large discharge area, further reducing the impact of the high back pressure near the central tube on the reverse osmosis membrane and improving the water filtration efficiency of the reverse osmosis membrane element.

[0117] It can be further understood that in this disclosure, "multiple" refers to two or more, and other quantifiers are similar. "And / or" describes the relationship between related objects, indicating that three relationships can exist; for example, A and / or B can represent: A alone, A and B simultaneously, and B alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. The singular forms "a," "the," and "the" are also intended to include the plural forms unless the context clearly indicates otherwise.

[0118] It is further understood that the terms "first," "second," etc., are used to describe various types of information, but this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another, and do not indicate a specific order or degree of importance. In fact, the expressions "first," "second," etc., are completely interchangeable. For example, without departing from the scope of this disclosure, first information can also be referred to as second information, and similarly, second information can also be referred to as first information.

[0119] It is further understood that although operations are described in a specific order in the accompanying drawings in the embodiments of this disclosure, this should not be construed as requiring these operations to be performed in the specific order or serial order shown, or requiring all of the shown operations to be performed to obtain the desired result. In certain environments, multitasking and parallel processing may be advantageous.

[0120] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the utility models disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the following claims.

[0121] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. A feed water separator for use in reverse osmosis membrane elements, characterized in that, include: The inlet screen body (2) is used to attach the reverse osmosis membrane sheet (1) in the reverse osmosis membrane element; The water inlet mesh body (2) has water blocking parts (4) that are spaced apart and staggered along the extension direction of the water inlet mesh body (2), so that the water inlet mesh forms a continuously bending water diversion channel; The spacing between two adjacent water-blocking parts (4) decreases sequentially.

2. The inlet screen according to claim 1, characterized in that, The water-blocking part (4) is an adhesive strip on which the water inlet mesh body (2) is attached to the reverse osmosis membrane (1).

3. The inlet screen according to claim 1, characterized in that, The water diversion channel includes multiple water diversion channels (201); The plurality of water diversion channels (201) are designed such that the water in two adjacent water diversion channels (201) have different flow directions, and the plurality of water diversion channels (201) are connected sequentially along the water flow direction; The flow area of ​​the plurality of water diversion channels (201) decreases sequentially along the water inlet flow direction.

4. The inlet screen according to claim 3, characterized in that, The plurality of water diversion channels (201) enable the incoming water to flow in an S-shape within the water inlet mesh.

5. A reverse osmosis membrane unit, characterized in that, include: A reverse osmosis membrane (1) has a first side and a second side opposite to each other; An inlet screen is sandwiched between the first surfaces of the two layers of the reverse osmosis membrane (1) to form a water inlet channel with the reverse osmosis membrane (1), wherein the inlet screen is the inlet screen as described in any one of claims 1-4; Pure water flow guide cloth (3) is provided on the second side of the reverse osmosis membrane (1).

6. A reverse osmosis membrane element, characterized in that, include: Central tube (5); Multiple reverse osmosis membrane units as described in claim 5; In this process, multiple reverse osmosis membrane units are wound around the outside of the central tube (5) in sequence from near to far from the central tube (5). The reverse osmosis membrane element has a first end and a second end that are opposite each other along the axial direction. A circumferential seal (10) is provided on the outer peripheral surface of the first end and the outer peripheral surface of the second end. A first radial seal (8) is provided on the end face of the first end and a second radial seal (9) is provided on the end face of the second end. The portion of the end face of the first end that does not cover the first radial seal (8) forms the raw water inlet (202), and the portion of the end face of the second end that does not cover the second radial seal (9) forms the concentrated water outlet (203). A pure water outlet (7) is formed between the two circumferential seals (10).

7. The reverse osmosis membrane element according to claim 6, characterized in that, In the radial direction of the central pipe (5), the length of the inlet screen body (2) is L, the length of the raw water inlet (202) is L1, and the length of the concentrate outlet (203) is L2; Where L / 15≤L2<L1≤L / 2.

8. The reverse osmosis membrane element according to claim 7, characterized in that, The plurality of water diversion channels (201) in the water diversion channel include a first water diversion channel (2011), a second water diversion channel (2012) and a third water diversion channel (2013), wherein the width of the first water diversion channel (2011) is H1, the width of the second water diversion channel (2012) is H2, and the width of the third water diversion channel (2013) is H3; Among them, L1≥H1>H2>H3≥L2.

9. The reverse osmosis membrane element according to claim 6, characterized in that, Both the end face of the first end and the end face of the second end are constructed as annular surfaces; Both the first radial seal (8) and the second radial seal (9) are constructed as annular sealing walls; The pure water outlet (7) is configured as a strip-shaped opening extending axially along the central tube (5); wherein the annular diameter of the end face of the first end and the end face of the second end are both R, the annular diameter of the first radial seal (8) is r1, the annular diameter of the second radial seal (9) is r2, and R-r1>R-r2.

10. The reverse osmosis membrane element according to claim 6, characterized in that, The two end sidewalls and the peripheral sidewalls of the central tube (5) are all constructed as closed walls.

11. A filter element, characterized in that, include: The reverse osmosis membrane element as described in any one of claims 6-10.

12. A filtration system, characterized in that, include: The filter element as described in claim 11.

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