Membrane structure and water purifying device

Abstract

The utility model relates to a membrane structure and a water purification device, and relates to the technical field of water purification treatment. The diaphragm structure comprises a diaphragm group and at least one separator, the diaphragm group comprises at least two layers of diaphragm bodies, the at least two layers of diaphragm bodies are sequentially stacked, and the front surfaces of the two adjacent layers of diaphragm bodies are oppositely arranged to form a water inlet runner; the membrane body is provided with a first side and a second side which are oppositely arranged in a first direction, the first side is provided with a raw water inlet communicated with the water inlet flow channel, and the second side is provided with a concentrated water outlet communicated with the water inlet flow channel; at least one separator is arranged in the water inlet flow channel, and the separator is configured to be capable of separating the water inlet flow channel so as to improve the flow speed of fluid in the water inlet flow channel. According to the technical scheme disclosed by the utility model, the membrane surface concentration polarization layer phenomenon can be weakened, the anti-pollution capability of the membrane structure is improved, and the service life of the membrane structure is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of water purification technology, and in particular to a membrane structure and a water purification device. Background Technology

[0002] Spiral wound membrane filter cartridges are one of the core components in water purification equipment. They are made by rolling up commonly used water treatment membranes such as reverse osmosis membranes, nanofiltration membranes, and microfiltration membranes. Utilizing the selective separation characteristics of water treatment membranes, they remove one or more substances from raw water to achieve purification, concentration, and refinement. During the water treatment process, after raw water enters the flow channel, a portion of the raw water permeates to the back of the water treatment membrane under pressure, forming pure water, which flows out from the pure water outlet. The other portion gradually forms concentrated water, which flows out from the concentrated water outlet. Typically, the flow rate of concentrated water discharged from the concentrated water side is 20% to 70% of the raw water inlet flow rate. As the flow rate of raw water gradually decreases along the flow channel, the flow velocity on the membrane surface decreases, and the flow path becomes shorter, leading to increased concentration polarization on the concentrated water side of the water treatment membrane, thus shortening the lifespan of the spiral wound membrane filter cartridge. Utility Model Content

[0003] This utility model provides a membrane structure and a water purification device that can reduce the concentration polarization layer phenomenon on the membrane surface and improve the antifouling ability and service life of the membrane structure.

[0004] In a first aspect, embodiments of the present invention provide a diaphragm structure, comprising:

[0005] A membrane assembly, comprising a membrane body, wherein the membrane body comprises at least two layers, and the at least two layers of the membrane body are stacked sequentially, with the front faces of adjacent layers of the membrane body facing each other to form a water inlet channel; and the membrane body has a first side and a second side disposed opposite to each other in a first direction, the first side having a raw water inlet connected to the water inlet channel, and the second side having a concentrated water outlet connected to the water inlet channel; and

[0006] At least one separator is disposed within the water inlet channel, the separator being configured to separate the water inlet channel to increase the flow rate of fluid within the water inlet channel.

[0007] In one embodiment, the diaphragm body has a third side and a fourth side disposed opposite to each other in a second direction; the diaphragm structure includes a plurality of spacers extending along the second direction, a portion of the plurality of spacers having one end connected to the third side and the other end spaced from the fourth side; another portion of the plurality of spacers having one end connected to the fourth side and the other end spaced from the third side.

[0008] The plurality of the partitions are arranged at intervals along the first direction, and the partitions connected to the third side and the partitions connected to the fourth side are arranged alternately along the first direction to form a water inlet section between two adjacent partitions.

[0009] In one embodiment, the length of the raw water inlet in the second direction is L1, the length of the separator in the second direction is L2, and the length of the membrane body in the second direction is L3; wherein, L1, L2 and L3 satisfy the following relationship: 1 / 15≤L1 / L3≤1 / 2, L2>L3-L1.

[0010] In one embodiment, the length of the plurality of water inlet sections in the first direction decreases as the distance between the water inlet section and the raw water inlet increases.

[0011] In one embodiment, the separator is parallel to the second direction; or

[0012] The separator is inclined in the second direction so that the length of the water inlet section in the first direction gradually decreases along the flow direction of the fluid.

[0013] In one embodiment, the membrane body has a third side and a fourth side disposed opposite to each other in a second direction; the membrane structure includes a plurality of separators, the plurality of separators extending along the first direction, a portion of the plurality of separators having one end connected to the first side and the other end having a gap from the second side; another portion of the plurality of separators having one end connected to the second side and the other end having a gap from the first side;

[0014] The plurality of the partitions are arranged at intervals along the second direction, and the partitions connected to the first side and the partitions connected to the second side are arranged alternately along the second direction to form a water inlet section between two adjacent partitions.

[0015] In one embodiment, the length of the plurality of water inlet sections in the second direction decreases as the distance between the water inlet section and the raw water inlet increases.

[0016] In one embodiment, the length of the plurality of separators in the first direction increases with the increase of the distance between the separators and the raw water inlet;

[0017] The minimum length of the water inlet section in the second direction is L4, the maximum length of the water inlet section in the second direction is L5, the length of the separator in the first direction is L6, and the length of the diaphragm body in the first direction is L7; wherein, L4, L5, L6 and L7 satisfy the following relationship: L7-L5<L6<L7-L4.

[0018] In one embodiment, the separator is parallel to the first direction; or

[0019] The separator is inclined in the first direction so that the length of the water inlet section in the second direction gradually decreases along the flow direction of the fluid.

[0020] In one embodiment, the membrane body is one of a reverse osmosis membrane, a nanofiltration membrane, and a microfiltration membrane.

[0021] In one embodiment, the diaphragm structure further includes a central tube, and the diaphragm assembly can be wound around the central tube;

[0022] The membrane assembly also includes an inlet screen and a pure water guide cloth. The inlet screen is disposed in the inlet channel. The pure water guide cloth is disposed on the reverse side of the membrane body to form a product water channel stacked with the inlet channel. A pure water outlet is provided at the end of the product water channel away from the central tube.

[0023] In one embodiment, there are multiple membrane groups, which are stacked together, and the pure water flow guide cloth is located between two adjacent membrane groups.

[0024] In one embodiment, the radial thickness of the end face formed by the diaphragm assembly wound around the central tube is R;

[0025] The diaphragm structure further includes a sealing portion disposed on the end face, the radial thickness of the sealing portion being r; wherein, R and r satisfy the following relationship, 2 / 3≤r / R<1.

[0026] Secondly, this utility model provides a water purification device, including the membrane structure described above.

[0027] Compared with the prior art, the advantages of this utility model embodiment are that by setting the raw water inlet and concentrated water outlet on the first and second sides of the membrane body respectively, and by setting a separator in the inlet channel to divide the inlet channel, the existing inlet channel in which raw water enters and exits the membrane body in a straight line is changed. This extends the flow path of the raw water in the inlet channel, thereby extending the filtration path of the raw water in the inlet channel, increasing the contact time between the raw water and the membrane body, and improving the filtration effect and water production efficiency. By setting a separator to divide the inlet channel, the inlet channel can be narrowed, increasing the membrane surface velocity and the membrane surface scouring force, thereby reducing the concentration polarization layer phenomenon on the membrane surface, improving the antifouling ability of the membrane structure, and extending the service life of the membrane structure. Attached Figure Description

[0028] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings.

[0029] Figure 1 This is a schematic diagram of the structure of a diaphragm body provided in one embodiment of the present invention;

[0030] Figure 2 This is a schematic diagram of the structure of the diaphragm body provided in another embodiment of the present invention;

[0031] Figure 3 This is a schematic diagram of the structure of the diaphragm body provided in another embodiment of the present invention;

[0032] Figure 4 This is a schematic diagram of the structure of the diaphragm body provided in another embodiment of the present invention;

[0033] Figure 5 This is a schematic diagram of the structure of the diaphragm body provided in another embodiment of the present invention;

[0034] Figure 6 yes Figure 1 A schematic diagram of the unfolded membrane assembly provided in the embodiment;

[0035] Figure 7 yes Figure 1 A schematic diagram of the structure of the diaphragm assembly after winding, provided in the embodiment;

[0036] Figure 8 yes Figure 1 A side view of the membrane structure provided in the embodiment.

[0037] Figure label:

[0038] 10. Membrane body; 110. First side; 1101. Raw water inlet; 120. Second side; 1201. Concentrate outlet; 130. Third side; 140. Fourth side;

[0039] 20. Inlet channel; 210. Inlet section;

[0040] 30. Divider;

[0041] 40. Central tube;

[0042] 50. Inlet screen;

[0043] 60. Pure water diversion cloth;

[0044] 70. Water production channel; 710. Pure water outlet;

[0045] 80. Sealing section. Detailed Implementation

[0046] The present invention will be further described below with reference to the accompanying drawings.

[0047] Spiral wound membrane filter cartridges are one of the core components of water purification equipment. They are typically constructed by winding an inlet screen, a water treatment membrane, and a pure water guide cloth around a central product water pipe and sealing them together. Reverse osmosis membranes, nanofiltration membranes, and microfiltration membranes are commonly used water treatment membranes. These membranes utilize their selective separation properties to remove one or more substances from the raw water, achieving purification, concentration, and refinement. During the water treatment process, after the raw water enters the flow channel, a portion of the raw water permeates under pressure to the back of the water treatment membrane, forming pure water, which flows out from the pure water outlet. The other portion gradually forms concentrated water, which flows out from the concentrated water outlet. Typically, the flow rate of the concentrated water discharged from the concentrated water side is 20% to 70% of the raw water inlet flow rate. As the flow rate of the raw water gradually decreases along the flow channel, the flow velocity on the membrane surface decreases, and the flow path becomes shorter, leading to increased concentration polarization on the concentrated water side of the water treatment membrane, thus shortening the lifespan of the spiral wound membrane filter cartridge.

[0048] Example 1

[0049] like Figure 1 As shown, in order to solve the above-mentioned technical problems, this utility model provides a membrane structure, including a membrane assembly and at least one separator 30; the membrane assembly includes a membrane body 10, the membrane body 10 having at least two layers, and the at least two layers of membrane body 10 being stacked sequentially, with the front faces of adjacent layers of membrane body 10 facing each other to form a water inlet channel 20; the membrane body 10 has a first side 110 and a second side 120 arranged opposite to each other in a first direction, the first side 110 having a raw water inlet 1101 communicating with the water inlet channel 20, and the second side 120 having a concentrated water outlet 1201 communicating with the water inlet channel 20; at least one separator 30 is disposed in the water inlet channel 20, and the separator 30 is configured to separate the water inlet channel 20 to increase the flow rate of the fluid in the water inlet channel 20.

[0050] As can be seen from the above, by setting the raw water inlet 1101 and the concentrated water outlet 1201 on the first side 110 and the second side 120 of the membrane body 10 respectively, and by setting a separator 30 in the inlet channel 20 to separate the inlet channel 20, the existing inlet channel 20, where raw water enters and exits in a straight line from the end face of the membrane body 10, is changed. This extends the flow path of the raw water in the inlet channel 20, thereby extending the filtration path of the raw water in the inlet channel 20, increasing the contact time between the raw water and the membrane body 10, and improving the filtration effect and water production efficiency. By setting the separator 30 to separate the inlet channel 20, the inlet channel 20 can be narrowed, increasing the membrane surface velocity and the membrane surface scouring force, thereby reducing the concentration polarization layer phenomenon on the membrane surface, improving the antifouling ability of the membrane structure, slowing down the scaling rate, and increasing the service life of the membrane structure.

[0051] It should be noted that the first direction is the width direction of the diaphragm body 10, and the second direction is the length direction of the diaphragm body 10; for example... Figure 1 As shown, the first direction is parallel to the Y direction, and the second direction is parallel to the X direction.

[0052] It should also be noted that the front side of the membrane body 10 refers to the side where water molecules can permeate out under high pressure, that is, the side of the membrane body 10 used to form the water inlet channel 20; correspondingly, the other side of the membrane body 10 is the back side.

[0053] It should also be noted that the membrane body 10 has two layers, which are stacked one on top of the other. It can be formed by stacking two membrane bodies 10 one on top of the other, or by folding the front side of a membrane body 10 inward to form two layers.

[0054] It should also be noted that the separator 30 is a colloid, which is formed by the curing of adhesive. The colloid is placed on the front side of the diaphragm body 10 and has a sealing effect, preventing raw water from passing through it; thus, it serves to separate the water inlet channel 20.

[0055] It should also be noted that, due to the selective permeability of water treatment membranes, the solvent (usually water) permeates through the membrane from the high-pressure side, while the solute is retained by the membrane, and its concentration increases at the membrane surface. At the same time, back diffusion occurs from the membrane surface to the bulk solution. When the two mass transfer processes reach dynamic equilibrium, the concentration at the membrane surface is higher than the concentration in the bulk solution. This phenomenon is called concentration polarization.

[0056] It should also be noted that, since the raw water flow velocity V = Q / (L*T), where Q is the raw water flow rate, L is the length of the inlet channel 20 (i.e., L is the length of the cross section of the inlet section 210 perpendicular to the direction of fluid flow), and T is the thickness of the inlet channel 20, when the raw water flow rate is constant, by setting the separator 30 to divide the inlet channel 20 into multiple inlet sections 210, the inlet channel 20 becomes narrower, thereby increasing the raw water flow velocity and reducing the concentration polarization phenomenon on the membrane surface.

[0057] Example 2

[0058] like Figure 1 As shown, the membrane structure includes a membrane assembly and at least one separator 30; the membrane assembly includes a membrane body 10, which has at least two layers, and the at least two layers of membrane bodies 10 are stacked sequentially, with the front faces of adjacent layers of membrane bodies 10 facing each other to form an inlet channel 20; the membrane body 10 has a first side 110 and a second side 120 arranged opposite each other in a first direction, the first side 110 is provided with a raw water inlet 1101 communicating with the inlet channel 20, and the second side 120 is provided with a concentrated water outlet 1201 communicating with the inlet channel 20; at least one separator 30 is disposed in the inlet channel 20, and the separator 30 is configured to separate the inlet channel 20 to increase the flow rate of the fluid in the inlet channel 20.

[0059] As can be seen from the above, by setting the raw water inlet 1101 and the concentrated water outlet 1201 on the first side 110 and the second side 120 of the membrane body 10 respectively, and by setting a separator 30 in the inlet channel 20 to separate the inlet channel 20, the existing inlet channel 20, where raw water enters and exits in a straight line from the end face of the membrane body 10, is changed. This extends the flow path of the raw water in the inlet channel 20, thereby extending the filtration path of the raw water in the inlet channel 20, increasing the contact time between the raw water and the membrane body 10, and improving the filtration effect and water production efficiency. By setting the separator 30 to separate the inlet channel 20, the inlet channel 20 can be narrowed, increasing the membrane surface velocity and the membrane surface scouring force, thereby reducing the concentration polarization layer phenomenon on the membrane surface, improving the antifouling ability of the membrane structure, slowing down the scaling rate, and increasing the service life of the membrane structure.

[0060] It should be noted that the first direction is the width direction of the diaphragm body 10, and the second direction is the length direction of the diaphragm body 10; for example... Figure 1 As shown, the first direction is parallel to the Y direction, and the second direction is parallel to the X direction.

[0061] It should also be noted that the front side of the membrane body 10 refers to the side where water molecules can permeate out under high pressure, that is, the side of the membrane body 10 used to form the water inlet channel 20; correspondingly, the other side of the membrane body 10 is the back side.

[0062] It should also be noted that the membrane body 10 has two layers, which are stacked one on top of the other. It can be formed by stacking two membrane bodies 10 one on top of the other, or by folding the front side of a membrane body 10 inward to form two layers.

[0063] It should also be noted that the separator 30 is a colloid, which is formed by the curing of adhesive. The colloid is placed on the front side of the diaphragm body 10 and has a sealing effect, preventing raw water from passing through it; thus, it serves to separate the water inlet channel 20.

[0064] It should also be noted that, due to the selective permeability of water treatment membranes, the solvent (usually water) permeates through the membrane from the high-pressure side, while the solute is retained by the membrane, and its concentration increases at the membrane surface. At the same time, back diffusion occurs from the membrane surface to the bulk solution. When the two mass transfer processes reach dynamic equilibrium, the concentration at the membrane surface is higher than the concentration in the bulk solution. This phenomenon is called concentration polarization.

[0065] It should also be noted that, since the raw water flow velocity V = Q / (L*T), where Q is the raw water flow rate, L is the length of the inlet channel 20 (i.e., L is the length of the cross section of the inlet section 210 perpendicular to the direction of fluid flow), and T is the thickness of the inlet channel 20, when the raw water flow rate is constant, by setting the separator 30 to divide the inlet channel 20 into multiple inlet sections 210, the inlet channel 20 becomes narrower, thereby increasing the raw water flow velocity and reducing the concentration polarization phenomenon on the membrane surface.

[0066] like Figure 2 As shown, in some embodiments, the membrane body 10 has a third side 130 and a fourth side 140 disposed opposite to each other in a second direction; the membrane structure includes a plurality of partitions 30 extending along the second direction, one end of a portion of the partitions 30 being connected to the third side 130 and the other end being spaced from the fourth side 140; one end of another portion of the partitions 30 being connected to the fourth side 140 and the other end being spaced from the third side 130; wherein the plurality of partitions 30 are spaced apart along a first direction, and the partitions 30 connected to the third side 130 and the partitions 30 connected to the fourth side 140 are staggered along the first direction to form an inlet section 210 between two adjacent partitions 30.

[0067] By staggering the separators 30 connected to the third side 130 and the fourth side 140 in the first direction, a spiral inlet channel 20 is formed. This repeatedly changes the flow direction of the fluid, further extending the filtration path of the raw water within the inlet channel 20, increasing the contact time between the raw water and the membrane body 10, and improving the filtration effect and water production efficiency. Simultaneously, the spiral flow of the raw water through the spiral inlet channel 20 increases the shear velocity at the concentrate end, reducing concentration polarization caused by poor water quality at the concentrate end, further reducing fouling of the membrane body 10, improving the reliability of the membrane body 10, and extending its service life.

[0068] It should be noted that, as Figure 1 As shown, when there is only one partition 30, one end of the partition 30 is connected to the fourth side 140, and the other end is spaced from the third side 130. Additionally, as... Figure 2 As shown, when the number of separators 30 is odd, the raw water inlet 1101 is located at the end of the first side 110 away from the central pipe 40, and the concentrate outlet 1201 is located at the end of the second side 120 away from the central pipe 40. When the number of separators 30 is even, the raw water inlet 1101 can be set at the end of the first side 110 away from the central pipe 40, and the concentrate outlet 1201 can be set at the end of the second side 120 close to the central pipe 40, thereby preventing the fluid from flowing directly out of the concentrate outlet 1201 without passing through the water inlet section 210.

[0069] It should also be noted that the fourth side 140 is the side furthest from the central tube 40.

[0070] Example 3

[0071] like Figure 1 As shown, the membrane structure includes a membrane assembly and at least one separator 30; the membrane assembly includes a membrane body 10, which has at least two layers, and the at least two layers of membrane bodies 10 are stacked sequentially, with the front faces of adjacent layers of membrane bodies 10 facing each other to form an inlet channel 20; the membrane body 10 has a first side 110 and a second side 120 arranged opposite each other in a first direction, the first side 110 is provided with a raw water inlet 1101 communicating with the inlet channel 20, and the second side 120 is provided with a concentrated water outlet 1201 communicating with the inlet channel 20; at least one separator 30 is disposed in the inlet channel 20, and the separator 30 is configured to separate the inlet channel 20 to increase the flow rate of the fluid in the inlet channel 20.

[0072] As can be seen from the above, by setting the raw water inlet 1101 and the concentrated water outlet 1201 on the first side 110 and the second side 120 of the membrane body 10 respectively, and by setting a separator 30 in the inlet channel 20 to separate the inlet channel 20, the existing inlet channel 20, where raw water enters and exits in a straight line from the end face of the membrane body 10, is changed. This extends the flow path of the raw water in the inlet channel 20, thereby extending the filtration path of the raw water in the inlet channel 20, increasing the contact time between the raw water and the membrane body 10, and improving the filtration effect and water production efficiency. By setting the separator 30 to separate the inlet channel 20, the inlet channel 20 can be narrowed, increasing the membrane surface velocity and the membrane surface scouring force, thereby reducing the concentration polarization layer phenomenon on the membrane surface, improving the antifouling ability of the membrane structure, slowing down the scaling rate, and increasing the service life of the membrane structure.

[0073] It should be noted that the first direction is the width direction of the diaphragm body 10, and the second direction is the length direction of the diaphragm body 10; for example... Figure 1 As shown, the first direction is parallel to the Y direction, and the second direction is parallel to the X direction.

[0074] It should also be noted that the front side of the membrane body 10 refers to the side where water molecules can permeate out under high pressure, that is, the side of the membrane body 10 used to form the water inlet channel 20; correspondingly, the other side of the membrane body 10 is the back side.

[0075] It should also be noted that the membrane body 10 has two layers, which are stacked one on top of the other. It can be formed by stacking two membrane bodies 10 one on top of the other, or by folding the front side of a membrane body 10 inward to form two layers.

[0076] It should also be noted that the separator 30 is a colloid, which is formed by the curing of adhesive. The colloid is placed on the front side of the diaphragm body 10 and has a sealing effect, preventing raw water from passing through it; thus, it serves to separate the water inlet channel 20.

[0077] It should also be noted that, due to the selective permeability of water treatment membranes, the solvent (usually water) permeates through the membrane from the high-pressure side, while the solute is retained by the membrane, and its concentration increases at the membrane surface. At the same time, back diffusion occurs from the membrane surface to the bulk solution. When the two mass transfer processes reach dynamic equilibrium, the concentration at the membrane surface is higher than the concentration in the bulk solution. This phenomenon is called concentration polarization.

[0078] It should also be noted that, since the raw water flow velocity V = Q / (L*T), where Q is the raw water flow rate, L is the length of the inlet channel 20 (i.e., L is the length of the cross section of the inlet section 210 perpendicular to the direction of fluid flow), and T is the thickness of the inlet channel 20, when the raw water flow rate is constant, by setting the separator 30 to divide the inlet channel 20 into multiple inlet sections 210, the inlet channel 20 becomes narrower, thereby increasing the raw water flow velocity and reducing the concentration polarization phenomenon on the membrane surface.

[0079] like Figure 2 As shown, in some embodiments, the membrane body 10 has a third side 130 and a fourth side 140 disposed opposite to each other in a second direction; the membrane structure includes a plurality of partitions 30 extending along the second direction, one end of a portion of the partitions 30 being connected to the third side 130 and the other end being spaced from the fourth side 140; one end of another portion of the partitions 30 being connected to the fourth side 140 and the other end being spaced from the third side 130; wherein the plurality of partitions 30 are spaced apart along a first direction, and the partitions 30 connected to the third side 130 and the partitions 30 connected to the fourth side 140 are staggered along the first direction to form an inlet section 210 between two adjacent partitions 30.

[0080] By staggering the separators 30 connected to the third side 130 and the fourth side 140 in the first direction, a spiral inlet channel 20 is formed. This repeatedly changes the flow direction of the fluid, further extending the filtration path of the raw water within the inlet channel 20, increasing the contact time between the raw water and the membrane body 10, and improving the filtration effect and water production efficiency. Simultaneously, the spiral flow of the raw water through the spiral inlet channel 20 increases the shear velocity at the concentrate end, reducing concentration polarization caused by poor water quality at the concentrate end, further reducing fouling of the membrane body 10, improving the reliability of the membrane body 10, and extending its service life.

[0081] It should be noted that, as Figure 1 As shown, when there is only one partition 30, one end of the partition 30 is connected to the fourth side 140, and the other end is spaced from the third side 130. Additionally, as... Figure 2 As shown, when the number of separators 30 is odd, the raw water inlet 1101 is located at the end of the first side 110 away from the central pipe 40, and the concentrate outlet 1201 is located at the end of the second side 120 away from the central pipe 40. When the number of separators 30 is even, the raw water inlet 1101 can be set at the end of the first side 110 away from the central pipe 40, and the concentrate outlet 1201 can be set at the end of the second side 120 close to the central pipe 40, thereby preventing the fluid from flowing directly out of the concentrate outlet 1201 without passing through the water inlet section 210.

[0082] It should also be noted that the fourth side 140 is the side furthest from the central tube 40.

[0083] like Figure 1 As shown, in some embodiments, the length of the raw water inlet 1101 in the second direction is L1, the length of the separator 30 in the second direction is L2, and the length of the membrane body 10 in the second direction is L3; wherein, L1, L2 and L3 satisfy the following relationship: 1 / 15≤L1 / L3≤1 / 2, L2>L3-L1.

[0084] The length of the separator 30 in the second direction is limited by setting the length relationship between the raw water inlet 1101, the separator 30, and the membrane body 10. This prevents the separator 30 from being too short, which would cause the raw water to flow straight out without changing its flow direction in the inlet channel 20. The length of the raw water inlet 1101 in the second direction is also limited by setting the length relationship between the raw water inlet 1101 and the membrane body 10. This ensures that while meeting the water production efficiency requirements, the reliability of the membrane body 10 is also guaranteed. Furthermore, an excessively long raw water inlet 1101 would reduce the length of the raw water channel, and the high-pressure environment at the raw water inlet 1101 would threaten the reliability of the connection between the pure water guide cloth 60 and the reverse osmosis membrane.

[0085] like Figure 2 As shown, in some embodiments, the length of the plurality of water inlet sections 210 in the first direction decreases as the distance between the water inlet section 210 and the raw water inlet 1101 increases.

[0086] By limiting the length of the inlet section 210 in the first direction, the membrane surface flow velocity is further increased, the concentration polarization layer phenomenon on the membrane surface is weakened, the antifouling ability of the membrane body 10 is improved, the reliability of the membrane body 10 is improved, and the service life of the membrane body 10 is extended.

[0087] It should be noted that, as Figure 2 As shown, the water inlet section 210 includes a first water inlet section 210 and a second water inlet section 210. The lengths of the first water inlet section 210 and the second water inlet section 210 in the first direction are W1 and W2, respectively. The distance between the first water inlet section 210 and the raw water inlet is less than the distance between the second water inlet section 210 and the raw water inlet, W1 > W2.

[0088] It should also be noted that after the raw water enters the feed channel 20 from the raw water inlet 1101, part of the raw water permeates to the reverse side of the membrane body 10 under pressure to form pure water, while the other part of the raw water flows out from the concentrate outlet 1201 along the feed channel 20. The flow rate of the raw water will become smaller and smaller, resulting in a decrease in the membrane surface velocity. Therefore, by limiting the length of multiple feed sections 210 in the first direction to decrease as the distance between the feed section 210 and the raw water inlet 1101 increases, the membrane surface velocity can be increased and the concentration polarization layer phenomenon can be weakened.

[0089] In some embodiments, the separator 30 is parallel to the second direction; or the separator 30 is inclined to the second direction so that the length of the inlet section 210 in the first direction gradually decreases along the flow direction of the fluid.

[0090] By setting the inclined separator 30, the length of each water inlet section 210 in the first direction gradually decreases along the flow direction of the fluid, that is, the water inlet section 210 gradually narrows, thereby further increasing the membrane surface velocity, weakening the concentration polarization layer phenomenon, improving the antifouling ability of the membrane body 10, and extending its service life.

[0091] It should be noted that, as Figure 1 , Figure 2 As shown, the separator 30 is parallel to the second direction; as Figure 3 As shown, the separator 30 is inclined in the second direction, and the angle between the separator 30 and the second direction can be set as needed. This application does not impose any specific restrictions.

[0092] In some embodiments, the membrane body 10 is one of a reverse osmosis membrane, a nanofiltration membrane, and a microfiltration membrane.

[0093] like Figure 6 , Figure 7 As shown, in some embodiments, the membrane structure further includes a central tube 40, and the membrane assembly can be wound around the central tube 40; the membrane assembly also includes an inlet screen 50 and a pure water guide cloth 60, the inlet screen 50 is disposed in the inlet channel 20; the pure water guide cloth 60 is disposed on the reverse side of the membrane body 10 to form a product water channel 70 stacked with the inlet channel 20, and a pure water outlet 710 is provided at the end of the product water channel 70 away from the central tube 40.

[0094] The central tube 40 provides support and fixation; the inlet mesh 50 ensures that the fluid is evenly distributed on the surface of the diaphragm body 10, providing buffering and protection and preventing larger particles in the fluid from directly impacting the surface of the diaphragm body 10. The pure water guide cloth 60 serves to converge and guide the pure water flow, discharging it out.

[0095] It should be noted that both ends of the central tube 40 are sealed, and there are no through holes on the surface of the central tube 40.

[0096] It should also be noted that the front of the membrane body 10 is folded inward, and an opening is formed at the end of the membrane body 10 away from the folded edge. The opening is connected to the central tube 40. Raw water inlet 1101 and concentrated water outlet 1201 are reserved on each side of the first side 110 and the second side 120, respectively. The rest are closed and sealed to form the water inlet channel 20. The pure water guide cloth 60 is closed and sealed with the membrane body 10 on each side of the first side 110, the second side 120 and the third side 130, thereby forming the product water channel 70. A pure water outlet 710 is reserved on the side of the fourth side 140.

[0097] like Figure 6 As shown, in some embodiments, there are multiple membrane groups, which are stacked and arranged in layers, with the pure water flow guide cloth 60 located between two adjacent membrane groups.

[0098] It should be noted that multiple membrane groups can be arranged at equal intervals around the central tube 40, thereby avoiding multiple membrane groups being fixed in the same position on the central tube 40. This allows multiple membrane groups to be staggered in the circumferential direction, further improving water production efficiency. For example, if the distance between two adjacent membrane groups is P1, the outer circumference of the central tube 40 is P2, and the number of membrane groups is n, then P1 = P2 / n.

[0099] It should also be noted that two adjacent membrane groups can share a single pure water flow guide cloth 60. The pure water flow guide cloth 60 is connected to the opposite side of the two adjacent membrane groups to form a product water flow channel 70.

[0100] like Figure 8 As shown, in some embodiments, the radial thickness of the end face formed after the diaphragm assembly is wound around the central tube 40 is R; the diaphragm structure also includes a sealing part 80 disposed on the end face, the radial thickness of the sealing part 80 being r; wherein, R and r satisfy the following relationship, 2 / 3≤r / R<1.

[0101] It should be noted that the sealing part 80 is formed by sealing with glue; in addition, the part on the end face where the sealing part 80 is not provided is the raw water inlet 1101 and the concentrated water outlet 1201.

[0102] Example 4

[0103] like Figure 4As shown, the membrane structure includes a membrane assembly and at least one separator 30; the membrane assembly includes a membrane body 10, which has at least two layers, and the at least two layers of membrane bodies 10 are stacked sequentially, with the front faces of adjacent layers of membrane bodies 10 facing each other to form an inlet channel 20; the membrane body 10 has a first side 110 and a second side 120 arranged opposite each other in a first direction, the first side 110 is provided with a raw water inlet 1101 communicating with the inlet channel 20, and the second side 120 is provided with a concentrated water outlet 1201 communicating with the inlet channel 20; at least one separator 30 is disposed in the inlet channel 20, and the separator 30 is configured to separate the inlet channel 20 to increase the flow rate of the fluid in the inlet channel 20.

[0104] As can be seen from the above, by setting the raw water inlet 1101 and the concentrated water outlet 1201 on the first side 110 and the second side 120 of the membrane body 10 respectively, and by setting a separator 30 in the inlet channel 20 to separate the inlet channel 20, the existing inlet channel 20, where raw water enters and exits in a straight line from the end face of the membrane body 10, is changed. This extends the flow path of the raw water in the inlet channel 20, thereby extending the filtration path of the raw water in the inlet channel 20, increasing the contact time between the raw water and the membrane body 10, and improving the filtration effect and water production efficiency. By setting the separator 30 to separate the inlet channel 20, the inlet channel 20 can be narrowed, increasing the membrane surface velocity and the membrane surface scouring force, thereby reducing the concentration polarization layer phenomenon on the membrane surface, improving the antifouling ability of the membrane structure, slowing down the scaling rate, and increasing the service life of the membrane structure.

[0105] It should be noted that the first direction is the width direction of the diaphragm body 10, and the second direction is the length direction of the diaphragm body 10; for example... Figure 1 As shown, the first direction is parallel to the Y direction, and the second direction is parallel to the X direction.

[0106] It should also be noted that the front side of the membrane body 10 refers to the side where water molecules can permeate out under high pressure, that is, the side of the membrane body 10 used to form the water inlet channel 20; correspondingly, the other side of the membrane body 10 is the back side.

[0107] It should also be noted that the membrane body 10 has two layers, which are stacked one on top of the other. It can be formed by stacking two membrane bodies 10 one on top of the other, or by folding the front side of a membrane body 10 inward to form two layers.

[0108] It should also be noted that the separator 30 is a colloid, which is formed by the curing of adhesive. The colloid is placed on the front side of the diaphragm body 10 and has a sealing effect, preventing raw water from passing through it; thus, it serves to separate the water inlet channel 20.

[0109] It should also be noted that, due to the selective permeability of water treatment membranes, the solvent (usually water) permeates through the membrane from the high-pressure side, while the solute is retained by the membrane, and its concentration increases at the membrane surface. At the same time, back diffusion occurs from the membrane surface to the bulk solution. When the two mass transfer processes reach dynamic equilibrium, the concentration at the membrane surface is higher than the concentration in the bulk solution. This phenomenon is called concentration polarization.

[0110] It should also be noted that, since the raw water flow velocity V = Q / (L*T), where Q is the raw water flow rate, L is the length of the inlet channel 20 (i.e., L is the length of the cross section of the inlet section 210 perpendicular to the direction of fluid flow), and T is the thickness of the inlet channel 20, when the raw water flow rate is constant, by setting the separator 30 to divide the inlet channel 20 into multiple inlet sections 210, the inlet channel 20 becomes narrower, thereby increasing the raw water flow velocity and reducing the concentration polarization phenomenon on the membrane surface.

[0111] like Figure 4 As shown, in some embodiments, the membrane body 10 has a third side 130 and a fourth side 140 disposed opposite each other in a second direction; the membrane structure includes a plurality of partitions 30, which extend along a first direction, one end of a portion of the partitions 30 being connected to the first side 110 and the other end being spaced from the second side 120; one end of another portion of the partitions 30 being connected to the second side 120 and the other end being spaced from the first side 110; wherein the plurality of partitions 30 are spaced apart along the second direction, and the partitions 30 connected to the first side 110 and the partitions 30 connected to the second side 120 are staggered along the second direction to form an inlet section 210 between two adjacent partitions 30.

[0112] By arranging the separator 30 connected to the first side 110 and the separator 30 connected to the second side 120 alternately in the second direction, a spiral inlet channel 20 is formed. This repeatedly changes the direction of fluid flow, further extending the filtration path of the raw water within the inlet channel 20, increasing the contact time between the raw water and the membrane body 10, and improving the filtration effect and water production efficiency. Simultaneously, the spiral flow of the raw water through the spiral inlet channel 20 increases the shear velocity at the concentrate end, reducing concentration polarization caused by poor water quality at the concentrate end, further reducing fouling of the membrane body 10, improving the reliability of the membrane body 10, and extending its service life.

[0113] It should be noted that when there is only one partition 30, one end of the partition 30 can be connected to the first side 110, and the other end can be spaced apart from the second side 120; alternatively, one end can be connected to the second side 120, and the other end can be spaced apart from the first side 110; furthermore, as... Figure 4As shown, the raw water inlet 1101 is located at the end of the first side 110 away from the central pipe 40, and the concentrated water outlet 1201 is located at the end of the second side 120 away from the central pipe 40.

[0114] It should also be noted that the fourth side 140 is the side furthest from the central tube 40.

[0115] In some embodiments, the length of the plurality of water inlet sections 210 in the second direction decreases as the distance between the water inlet section 210 and the raw water inlet 1101 increases.

[0116] By limiting the length of the inlet section 210 in the second direction, the membrane surface flow velocity is further increased, the concentration polarization layer phenomenon on the membrane surface is weakened, the antifouling ability of the membrane body 10 is improved, the reliability of the membrane body 10 is improved, and the service life of the membrane body 10 is extended.

[0117] It should also be noted that after the raw water enters the feed channel 20 from the raw water inlet 1101, part of the raw water permeates to the reverse side of the membrane body 10 under pressure to form pure water, while the other part of the raw water flows out from the concentrate outlet 1201 along the feed channel 20. The flow rate of the raw water will become smaller and smaller, resulting in a decrease in the membrane surface velocity. Therefore, by limiting the length of multiple feed sections 210 in the first direction to decrease as the distance between the feed section 210 and the raw water inlet 1101 increases, the membrane surface velocity can be increased and the concentration polarization layer phenomenon can be weakened.

[0118] Example 5

[0119] like Figure 4 As shown, the membrane structure includes a membrane assembly and at least one separator 30; the membrane assembly includes a membrane body 10, which has at least two layers, and the at least two layers of membrane bodies 10 are stacked sequentially, with the front faces of adjacent layers of membrane bodies 10 facing each other to form an inlet channel 20; the membrane body 10 has a first side 110 and a second side 120 arranged opposite each other in a first direction, the first side 110 is provided with a raw water inlet 1101 communicating with the inlet channel 20, and the second side 120 is provided with a concentrated water outlet 1201 communicating with the inlet channel 20; at least one separator 30 is disposed in the inlet channel 20, and the separator 30 is configured to separate the inlet channel 20 to increase the flow rate of the fluid in the inlet channel 20.

[0120] As can be seen from the above, by setting the raw water inlet 1101 and the concentrated water outlet 1201 on the first side 110 and the second side 120 of the membrane body 10 respectively, and by setting a separator 30 in the inlet channel 20 to separate the inlet channel 20, the existing inlet channel 20, where raw water enters and exits in a straight line from the end face of the membrane body 10, is changed. This extends the flow path of the raw water in the inlet channel 20, thereby extending the filtration path of the raw water in the inlet channel 20, increasing the contact time between the raw water and the membrane body 10, and improving the filtration effect and water production efficiency. By setting the separator 30 to separate the inlet channel 20, the inlet channel 20 can be narrowed, increasing the membrane surface velocity and the membrane surface scouring force, thereby reducing the concentration polarization layer phenomenon on the membrane surface, improving the antifouling ability of the membrane structure, slowing down the scaling rate, and increasing the service life of the membrane structure.

[0121] It should be noted that the first direction is the width direction of the diaphragm body 10, and the second direction is the length direction of the diaphragm body 10; for example... Figure 1 As shown, the first direction is parallel to the Y direction, and the second direction is parallel to the X direction.

[0122] It should also be noted that the front side of the membrane body 10 refers to the side where water molecules can permeate out under high pressure, that is, the side of the membrane body 10 used to form the water inlet channel 20; correspondingly, the other side of the membrane body 10 is the back side.

[0123] It should also be noted that the membrane body 10 has two layers, which are stacked one on top of the other. It can be formed by stacking two membrane bodies 10 one on top of the other, or by folding the front side of a membrane body 10 inward to form two layers.

[0124] It should also be noted that the separator 30 is a colloid, which is formed by the curing of adhesive. The colloid is placed on the front side of the diaphragm body 10 and has a sealing effect, preventing raw water from passing through it; thus, it serves to separate the water inlet channel 20.

[0125] It should also be noted that, due to the selective permeability of water treatment membranes, the solvent (usually water) permeates through the membrane from the high-pressure side, while the solute is retained by the membrane, and its concentration increases at the membrane surface. At the same time, back diffusion occurs from the membrane surface to the bulk solution. When the two mass transfer processes reach dynamic equilibrium, the concentration at the membrane surface is higher than the concentration in the bulk solution. This phenomenon is called concentration polarization.

[0126] It should also be noted that, since the raw water flow velocity V = Q / (L*T), where Q is the raw water flow rate, L is the length of the inlet channel 20 (i.e., L is the length of the cross section of the inlet section 210 perpendicular to the direction of fluid flow), and T is the thickness of the inlet channel 20, when the raw water flow rate is constant, by setting the separator 30 to divide the inlet channel 20 into multiple inlet sections 210, the inlet channel 20 becomes narrower, thereby increasing the raw water flow velocity and reducing the concentration polarization phenomenon on the membrane surface.

[0127] like Figure 4 As shown, in some embodiments, the membrane body 10 has a third side 130 and a fourth side 140 disposed opposite each other in a second direction; the membrane structure includes a plurality of partitions 30, which extend along a first direction, one end of a portion of the partitions 30 being connected to the first side 110 and the other end being spaced from the second side 120; one end of another portion of the partitions 30 being connected to the second side 120 and the other end being spaced from the first side 110; wherein the plurality of partitions 30 are spaced apart along the second direction, and the partitions 30 connected to the first side 110 and the partitions 30 connected to the second side 120 are staggered along the second direction to form an inlet section 210 between two adjacent partitions 30.

[0128] By arranging the separator 30 connected to the first side 110 and the separator 30 connected to the second side 120 alternately in the second direction, a spiral inlet channel 20 is formed. This repeatedly changes the direction of fluid flow, further extending the filtration path of the raw water within the inlet channel 20, increasing the contact time between the raw water and the membrane body 10, and improving the filtration effect and water production efficiency. Simultaneously, the spiral flow of the raw water through the spiral inlet channel 20 increases the shear velocity at the concentrate end, reducing concentration polarization caused by poor water quality at the concentrate end, further reducing fouling of the membrane body 10, improving the reliability of the membrane body 10, and extending its service life.

[0129] It should be noted that when there is only one partition 30, one end of the partition 30 can be connected to the first side 110, and the other end can be spaced apart from the second side 120; alternatively, one end can be connected to the second side 120, and the other end can be spaced apart from the first side 110; furthermore, as... Figure 4 As shown, the raw water inlet 1101 is located at the end of the first side 110 away from the central pipe 40, and the concentrated water outlet 1201 is located at the end of the second side 120 away from the central pipe 40.

[0130] It should also be noted that the fourth side 140 is the side furthest from the central tube 40.

[0131] In some embodiments, the length of the plurality of water inlet sections 210 in the second direction decreases as the distance between the water inlet section 210 and the raw water inlet 1101 increases.

[0132] By limiting the length of the inlet section 210 in the second direction, the membrane surface flow velocity is further increased, the concentration polarization layer phenomenon on the membrane surface is weakened, the antifouling ability of the membrane body 10 is improved, the reliability of the membrane body 10 is improved, and the service life of the membrane body 10 is extended.

[0133] It should also be noted that after the raw water enters the feed channel 20 from the raw water inlet 1101, part of the raw water permeates to the reverse side of the membrane body 10 under pressure to form pure water, while the other part of the raw water flows out from the concentrate outlet 1201 along the feed channel 20. The flow rate of the raw water will become smaller and smaller, resulting in a decrease in the membrane surface velocity. Therefore, by limiting the length of multiple feed sections 210 in the first direction to decrease as the distance between the feed section 210 and the raw water inlet 1101 increases, the membrane surface velocity can be increased and the concentration polarization layer phenomenon can be weakened.

[0134] like Figure 4 As shown, in some embodiments, the length of the plurality of separators 30 in the first direction increases with the increase of the distance between the separators 30 and the raw water inlet 1101; the minimum length of the water inlet section 210 in the second direction is L4, the maximum length of the water inlet section 210 in the second direction is L5, the length of the separators 30 in the first direction is L6, and the length of the membrane body in the first direction is L7; wherein, L4, L5, L6 and L7 satisfy the following relationship, L7-L5<L6<L7-L4.

[0135] By setting multiple separators 30 whose lengths in the first direction increase with the distance between the separators 30 and the raw water inlet 1101, the length of the outlet of the inlet section 210 in the first direction decreases with the distance from the raw water inlet 1101. This increases the flow velocity of fluid flowing from the inlet section 210 into the next fluid section, preventing a decrease in membrane surface velocity due to a reduction in raw water flow, thereby increasing the membrane surface velocity and reducing the concentration polarization phenomenon. By limiting the length relationship between the separators 30, the inlet section 210, and the membrane body, the inlet channel 20 is ensured to gradually decrease in the water flow direction, thereby increasing the membrane surface velocity and reducing the concentration polarization phenomenon.

[0136] It should be noted that L7-L5 is greater than zero because the length of each water inlet section 210 in the first direction is L6, thus ensuring that the flow path of the fluid in each water inlet section 210 is along the long side of the water inlet section 210, thereby ensuring water production efficiency.

[0137] In some embodiments, the separator 30 is parallel to the first direction; or the separator 30 is inclined to the first direction so that the length of the inlet section 210 in the second direction gradually decreases along the flow direction of the fluid.

[0138] By setting the inclined separator 30, the length of each water inlet section 210 in the first direction gradually decreases along the flow direction of the fluid, that is, the water inlet section 210 gradually narrows, thereby further increasing the membrane surface velocity, weakening the concentration polarization layer phenomenon, improving the antifouling ability of the membrane body 10, and extending its service life.

[0139] It should be noted that, as Figure 4 As shown, the separator 30 is parallel to the first direction; as Figure 5 As shown, the separator 30 is inclined in the first direction, and the angle between the separator 30 and the first direction can be set as needed. This application does not impose any specific restrictions.

[0140] In some embodiments, the membrane body 10 is one of a reverse osmosis membrane, a nanofiltration membrane, and a microfiltration membrane.

[0141] like Figure 6 , Figure 7 As shown, in some embodiments, the membrane structure further includes a central tube 40, and the membrane assembly can be wound around the central tube 40; the membrane assembly also includes an inlet screen 50 and a pure water guide cloth 60, the inlet screen 50 is disposed in the inlet channel 20; the pure water guide cloth 60 is disposed on the reverse side of the membrane body 10 to form a product water channel 70 stacked with the inlet channel 20, and a pure water outlet 710 is provided at the end of the product water channel 70 away from the central tube 40.

[0142] The central tube 40 provides support and fixation; the inlet mesh 50 ensures that the fluid is evenly distributed on the surface of the diaphragm body 10, providing buffering and protection and preventing larger particles in the fluid from directly impacting the surface of the diaphragm body 10. The pure water guide cloth 60 serves to converge and guide the pure water flow, discharging it out.

[0143] It should be noted that both ends of the central tube 40 are sealed, and there are no through holes on the surface of the central tube 40.

[0144] It should also be noted that the front of the membrane body 10 is folded inward, and an opening is formed at the end of the membrane body 10 away from the folded edge. The opening is connected to the central tube 40. Raw water inlet 1101 and concentrated water outlet 1201 are reserved on each side of the first side 110 and the second side 120, respectively. The rest are closed and sealed to form the water inlet channel 20. The pure water guide cloth 60 is closed and sealed with the membrane body 10 on each side of the first side 110, the second side 120 and the third side 130, thereby forming the product water channel 70. A pure water outlet 710 is reserved on the side of the fourth side 140.

[0145] like Figure 6 As shown, in some embodiments, there are multiple membrane groups, which are stacked and arranged in layers, with the pure water flow guide cloth 60 located between two adjacent membrane groups.

[0146] It should be noted that multiple membrane groups can be arranged at equal intervals around the central tube 40, thereby avoiding multiple membrane groups being fixed in the same position on the central tube 40. This allows multiple membrane groups to be staggered in the circumferential direction, further improving water production efficiency. For example, if the distance between two adjacent membrane groups is P1, the outer circumference of the central tube 40 is P2, and the number of membrane groups is n, then P1 = P2 / n.

[0147] It should also be noted that two adjacent membrane groups can share a single pure water flow guide cloth 60. The pure water flow guide cloth 60 is connected to the opposite side of the two adjacent membrane groups to form a product water flow channel 70.

[0148] like Figure 8 As shown, in some embodiments, the radial thickness of the end face formed after the diaphragm assembly is wound around the central tube 40 is R; the diaphragm structure also includes a sealing part 80 disposed on the end face, the radial thickness of the sealing part 80 being r; wherein, R and r satisfy the following relationship, 2 / 3≤r / R<1.

[0149] It should be noted that the sealing part 80 is formed by sealing with glue; in addition, the part on the end face where the sealing part 80 is not provided is the raw water inlet 1101 and the concentrated water outlet 1201.

[0150] Example 6

[0151] This utility model embodiment also provides a water purification device, including the membrane structure of any embodiment of this utility model, thereby having all the technical effects brought about by the technical solutions of the above embodiments.

[0152] Although the present invention has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A diaphragm structure, characterized in that, include A membrane assembly, comprising a membrane body, wherein the membrane body comprises at least two layers, and the at least two layers of the membrane body are stacked sequentially, with the front faces of adjacent layers of the membrane body facing each other to form a water inlet channel; and the membrane body has a first side and a second side disposed opposite to each other in a first direction, wherein the first side is provided with a raw water inlet connected to the water inlet channel, and the second side is provided with a concentrated water outlet connected to the water inlet channel; as well as At least one separator is disposed within the water inlet channel, the separator being configured to separate the water inlet channel to increase the flow rate of fluid within the water inlet channel.

2. The diaphragm structure according to claim 1, characterized in that, The diaphragm body has a third side and a fourth side disposed opposite to each other in a second direction; the diaphragm structure includes a plurality of partitions, the plurality of partitions extending along the second direction, a portion of the plurality of partitions having one end connected to the third side and the other end having a gap from the fourth side; Another portion of the plurality of separators has one end connected to the fourth side and the other end spaced apart from the third side; The plurality of the partitions are arranged at intervals along the first direction, and the partitions connected to the third side and the partitions connected to the fourth side are arranged alternately along the first direction to form a water inlet section between two adjacent partitions.

3. The diaphragm structure according to claim 2, characterized in that, The length of the raw water inlet in the second direction is L1, the length of the separator in the second direction is L2, and the length of the membrane body in the second direction is L3; wherein, L1, L2 and L3 satisfy the following relationship: 1 / 15≤L1 / L3≤1 / 2, L2>L3-L1.

4. The diaphragm structure according to claim 3, characterized in that, The length of the plurality of water inlet sections in the first direction decreases as the distance between the water inlet section and the raw water inlet increases.

5. The membrane structure according to any one of claims 2-4, characterized in that, The separator is parallel to the second direction; or The separator is inclined in the second direction so that the length of the water inlet section in the first direction gradually decreases along the flow direction of the fluid.

6. The diaphragm structure according to claim 1, characterized in that, The diaphragm body has a third side and a fourth side disposed opposite to each other in a second direction; the diaphragm structure includes a plurality of partitions, the plurality of partitions extending along the first direction, a portion of the plurality of partitions having one end connected to the first side and the other end having a gap from the second side; Another portion of the plurality of separators has one end connected to the second side and the other end spaced apart from the first side; The plurality of the partitions are arranged at intervals along the second direction, and the partitions connected to the first side and the partitions connected to the second side are arranged alternately along the second direction to form a water inlet section between two adjacent partitions.

7. The diaphragm structure according to claim 6, characterized in that, The length of the plurality of water inlet sections in the second direction decreases as the distance between the water inlet section and the raw water inlet increases.

8. The diaphragm structure according to claim 7, characterized in that, The length of the plurality of separators in the first direction increases with the increase of the distance between the separators and the raw water inlet; The minimum length of the water inlet section in the second direction is L4, the maximum length of the water inlet section in the second direction is L5, the length of the separator in the first direction is L6, and the length of the diaphragm body in the first direction is L7; wherein, L4, L5, L6 and L7 satisfy the following relationship: L7-L5<L6<L7-L4.

9. The diaphragm structure according to any one of claims 6-8, characterized in that, The separator is parallel to the first direction; or The separator is inclined in the first direction so that the length of the water inlet section in the second direction gradually decreases along the flow direction of the fluid.

10. The diaphragm structure according to claim 1, characterized in that, The membrane body is one of the following: reverse osmosis membrane, nanofiltration membrane, and microfiltration membrane.

11. The diaphragm structure according to claim 1, characterized in that, The diaphragm structure also includes a central tube, and the diaphragm assembly can be wound around the central tube; The membrane assembly also includes an inlet screen and a pure water guide cloth. The inlet screen is disposed in the inlet channel. The pure water guide cloth is disposed on the reverse side of the membrane body to form a product water channel stacked with the inlet channel. A pure water outlet is provided at the end of the product water channel away from the central tube.

12. The diaphragm structure according to claim 11, characterized in that, The number of membrane groups is multiple, and the multiple membrane groups are stacked and arranged, with the pure water guide cloth located between two adjacent membrane groups.

13. The diaphragm structure according to claim 12, characterized in that, The radial thickness of the end face formed by the diaphragm assembly wound around the central tube is R; The diaphragm structure further includes a sealing portion disposed on the end face, the radial thickness of the sealing portion being r; wherein, R and r satisfy the following relationship, 2 / 3≤r / R<1.

14. A water purification device, characterized in that, Includes the membrane structure as described in any one of claims 1-13.

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