Membrane structure and water purifying device

Abstract

The invention 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 set and at least one separator, the diaphragm set comprises at least two layers of diaphragm bodies, the at least two layers of diaphragm bodies are sequentially stacked, and the front faces 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 invention, 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] The present invention relates to the technical field of water purification, and in particular to a diaphragm structure and a water purification device. Background Art

[0002] The rolled membrane filter element is one of the core components in the water treatment equipment. It is made by rolling up commonly used water treatment membranes such as reverse osmosis membranes, nanofiltration membranes, and microfiltration membranes. It uses the selective separation characteristics of water treatment membranes to remove one or more substances in the raw water to achieve the purpose of purification, concentration, and purification. In the water treatment process, after the raw water enters the raw water flow channel, a part of the raw water penetrates to the back of the water treatment membrane under pressure to form pure water, which flows out from the pure water outlet, and the other part of the raw water gradually forms concentrated water, which flows out from the concentrated water outlet. Under normal circumstances, the flow rate of concentrated water finally discharged from the concentrated water side is 20% to 70% of the raw water inlet flow rate, and as the flow rate of raw water gradually decreases along the flow channel, the flow rate on the membrane surface decreases and the process is short, which leads to the aggravation of the concentration polarization phenomenon on the concentrated water side of the water treatment membrane, resulting in a shortened life of the rolled membrane filter element. Summary of the invention

[0003] The embodiments of the present invention provide a diaphragm structure and a water purification device, which can reduce the concentration polarization layer phenomenon on the membrane surface and improve the anti-pollution ability and service life of the diaphragm structure.

[0004] In a first aspect, an embodiment of the present invention provides a diaphragm structure, comprising:

[0005] A diaphragm group, the diaphragm group comprising a diaphragm body, the diaphragm body having at least two layers, and the at least two layers of the diaphragm bodies are stacked in sequence, and the front faces of the two adjacent layers of the diaphragm bodies are arranged facing each other to form a water inlet channel; and the diaphragm body has a first side and a second side arranged opposite to each other in a first direction, 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; and

[0006] At least one partition is disposed in the water inlet channel, and the partition is configured to partition the water inlet channel to increase the flow rate of the fluid in the water inlet channel.

[0007] In one embodiment, the diaphragm body has a third side and a fourth side arranged opposite to each other in the second direction; the diaphragm structure includes a plurality of separators, the plurality of separators extend along the second direction, one end of a portion of the plurality of separators is connected to the third side, and the other end is spaced apart from the fourth side; one end of another portion of the plurality of separators is connected to the fourth side, and the other end is spaced apart from the third side;

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

[0009] In one embodiment, the length of the raw water inlet in the second direction is L1, the length of the partition in the second direction is L2, and the length of the diaphragm body in the second direction is L3; wherein L1, L2 and L3 satisfy the following relationship: 1 / 15≤L 1 / L 3≤1 / 2, L2>L3-L1.

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

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

[0012] The partition is arranged obliquely to 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 diaphragm body has a third side and a fourth side arranged opposite to each other in the second direction; the diaphragm structure includes a plurality of separators, the plurality of separators extend along the first direction, one end of a portion of the plurality of separators is connected to the first side, and the other end is spaced from the second side; one end of another portion of the plurality of separators is connected to the second side, and the other end is spaced from the first side;

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

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

[0016] In one embodiment, the lengths of the plurality of partitions in the first direction increase as the distance between the partitions and the raw water inlet increases;

[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 partition 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 partition is parallel to the first direction; or

[0019] The partition is arranged obliquely to 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 micromembrane filtration membrane.

[0021] In one embodiment, the diaphragm structure further comprises a central tube, and the diaphragm group can be wound on the central tube;

[0022] The diaphragm group also includes a water inlet screen and a pure water guide cloth. The water inlet screen is arranged in the water inlet channel; the pure water guide cloth is arranged on the reverse side of the diaphragm body to form a water production channel stacked with the water inlet channel. A pure water outlet is arranged at one end of the water production channel away from the central tube.

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

[0024] In one embodiment, the radial thickness of the end surface formed by the membrane group being wound around the central tube is R;

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

[0026] In a second aspect, an embodiment of the present invention provides a water purification device, comprising the diaphragm structure as described above.

[0027] Compared with the prior art, the advantages of the embodiments of the present invention are that, by respectively setting the raw water inlet and the concentrated water outlet on the first side and the second side of the diaphragm body, and setting a partition in the water inlet channel to separate the water inlet channel, the existing water inlet channel in which raw water enters and exits in a straight line from the end face of the diaphragm body is changed, the flow path of raw water in the water inlet channel is extended, thereby extending the filtration path of raw water in the water inlet channel, increasing the contact time between raw water and the diaphragm body, and improving the filtration effect and water production efficiency. By setting a partition to separate the water inlet channel, the water inlet channel can be narrowed, the membrane surface flow velocity can be increased, and the membrane surface flushing force can be increased, thereby weakening the concentration polarization layer phenomenon on the membrane surface, improving the anti-pollution ability of the diaphragm structure, and improving the service life of the diaphragm structure. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0029] Figure 1 is a schematic structural diagram of a diaphragm body provided by an embodiment of the present invention;

[0030] Figure 2 is a schematic structural diagram of a diaphragm body provided by another embodiment of the present invention;

[0031] Figure 3 is a structural schematic diagram of a diaphragm body provided by another embodiment of the present invention;

[0032] Figure 4 is a structural schematic diagram of a diaphragm body provided by yet another embodiment of the present invention;

[0033] Figure 5 is a structural schematic diagram of a diaphragm body provided by another embodiment of the present invention;

[0034] Figure 6 yes Figure 1 A schematic diagram of the structure of the membrane group when it is unfolded provided in the embodiment;

[0035] Figure 7 yes Figure 1 A schematic diagram of the structure of the membrane group after winding provided in the embodiment;

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

[0037] Reference numerals:

[0038] 10, diaphragm body; 110, first side; 1101, raw water inlet; 120, second side; 1201, concentrated water outlet; 130, third side; 140, fourth side;

[0039] 20. water inlet channel; 210. water inlet section;

[0040] 30. Separator;

[0041] 40. Center tube;

[0042] 50. Water inlet screen;

[0043] 60. Pure water diversion cloth;

[0044] 70. water production channel; 710. pure water outlet;

[0045] 80. Sealing part. DETAILED DESCRIPTION

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

[0047] The roll membrane filter element is one of the core components in the water treatment equipment. The roll membrane filter element is usually formed by winding the water inlet screen, water treatment membrane, and pure water guide cloth on the central water production pipe and sealing and connecting them. Among them, reverse osmosis membrane, nanofiltration membrane, microfiltration membrane, etc. are commonly used water treatment membranes. The selective separation characteristics of the water treatment membrane are used to remove one or more substances in the raw water to achieve the purpose of purification, concentration, and purification. In the water treatment process, after the raw water enters the raw water flow channel, part of the raw water penetrates to the back of the water treatment membrane under pressure to form pure water, which flows out from the pure water outlet, and the other part of the raw water gradually forms concentrated water, which flows out from the concentrated water outlet. Under normal circumstances, the flow rate of concentrated water finally discharged from the concentrated water side is 20% to 70% of the raw water inlet flow rate, and as the flow rate of the raw water gradually decreases along the flow channel, the flow rate on the membrane surface decreases and the process is short, which leads to the aggravation of the concentration polarization phenomenon on the concentrated water side of the water treatment membrane, resulting in a shortened life of the roll membrane filter element.

[0048] Embodiment 1

[0049] like Figure 1 As shown, in order to solve the above technical problems, an embodiment of the present invention provides a diaphragm structure, including a diaphragm group and at least one separator 30; the diaphragm group includes a diaphragm body 10, the diaphragm body 10 is at least two layers, and at least two layers of diaphragm bodies 10 are stacked in sequence, and the front faces of the diaphragm bodies 10 of two adjacent layers are arranged facing each other to form an inlet channel 20; and the diaphragm body 10 has a first side 110 and a second side 120 arranged opposite to each other in a first direction, a raw water inlet 1101 connected to the inlet channel 20 is arranged on the first side 110, and a concentrated water outlet 1201 connected to the inlet channel 20 is arranged on the second side 120; at least one separator 30 is arranged in the inlet channel 20, and the separator 30 is constructed to be able to separate the inlet channel 20 to increase the flow rate of the fluid in the 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 diaphragm body 10 respectively, and setting a partition 30 in the water inlet channel 20 to separate the water inlet channel 20, the existing water inlet channel 20 in which raw water enters and exits in a straight line from the end face of the diaphragm body 10 is changed, and the flow path of the raw water in the water inlet channel 20 is extended, thereby extending the filtration path of the raw water in the water inlet channel 20, increasing the contact time between the raw water and the diaphragm body 10, and improving the filtration effect and water production efficiency. By setting a partition 30 to separate the water inlet channel 20, the water inlet channel 20 can be narrowed, the membrane surface flow rate can be increased, and the membrane surface flushing force can be increased, thereby weakening the concentration polarization layer phenomenon on the membrane surface, improving the anti-pollution ability of the diaphragm structure, delaying the scaling rate, and increasing the service life of the diaphragm 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; 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 diaphragm body 10 refers to the side through which water molecules can permeate under high pressure, that is, the side of the diaphragm body 10 used to form the water inlet channel 20; correspondingly, the other side of the diaphragm body 10 is the reverse side.

[0053] It should also be noted that the diaphragm body 10 has two layers, and the two layers of the diaphragm body 10 are stacked in sequence. They can be formed by two diaphragm bodies 10 stacked in sequence, or by a diaphragm body 10 with its front side folded inward to form two layers.

[0054] It should also be noted that the separator 30 is a colloid formed by solidifying glue, which is arranged on the front side of the diaphragm body 10 and has a sealing effect. Raw water cannot pass through the colloid, thereby playing the role of separating the water inlet channel 20 .

[0055] It should also be noted that due to the selective permeability of the water treatment membrane, the solvent (usually water) passes 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. When the two mass transfer processes reach dynamic equilibrium, the concentration on 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 rate V = Q / (L*T), where Q is the raw water flow rate, L is the length of the water inlet channel 20 (i.e., L is the length of the cross section of the water inlet section 210 perpendicular to the fluid flow direction), and T is the thickness of the water inlet channel 20, when the raw water flow rate is constant, the water inlet channel 20 is divided into multiple water inlet sections 210 by setting a partition 30, and the water inlet channel 20 becomes narrower, thereby increasing the raw water flow rate and reducing the concentration polarization phenomenon on the membrane surface.

[0057] Embodiment 2

[0058] like Figure 1 As shown, the diaphragm structure includes a diaphragm group and at least one separator 30; the diaphragm group includes a diaphragm body 10, the diaphragm body 10 is at least two layers, and at least two layers of diaphragm bodies 10 are stacked in sequence, and the front faces of the two adjacent layers of diaphragm bodies 10 are arranged facing each other to form an inlet channel 20; and the diaphragm body 10 has a first side 110 and a second side 120 that are arranged opposite to each other in a first direction, and a raw water inlet 1101 connected to the inlet channel 20 is arranged on the first side 110, and a concentrated water outlet 1201 connected to the inlet channel 20 is arranged on the second side 120; at least one separator 30 is arranged in the inlet channel 20, and the separator 30 is constructed to be able 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 diaphragm body 10 respectively, and setting a partition 30 in the water inlet channel 20 to separate the water inlet channel 20, the existing water inlet channel 20 in which raw water enters and exits in a straight line from the end face of the diaphragm body 10 is changed, and the flow path of the raw water in the water inlet channel 20 is extended, thereby extending the filtration path of the raw water in the water inlet channel 20, increasing the contact time between the raw water and the diaphragm body 10, and improving the filtration effect and water production efficiency. By setting a partition 30 to separate the water inlet channel 20, the water inlet channel 20 can be narrowed, the membrane surface flow rate can be increased, and the membrane surface flushing force can be increased, thereby weakening the concentration polarization layer phenomenon on the membrane surface, improving the anti-pollution ability of the diaphragm structure, delaying the scaling rate, and increasing the service life of the diaphragm 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; 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 diaphragm body 10 refers to the side through which water molecules can permeate under high pressure, that is, the side of the diaphragm body 10 used to form the water inlet channel 20; correspondingly, the other side of the diaphragm body 10 is the reverse side.

[0062] It should also be noted that the diaphragm body 10 has two layers, and the two layers of the diaphragm body 10 are stacked in sequence. They can be formed by two diaphragm bodies 10 stacked in sequence, or by a diaphragm body 10 with its front side folded inward to form two layers.

[0063] It should also be noted that the separator 30 is a colloid formed by solidifying glue, which is arranged on the front side of the diaphragm body 10 and has a sealing effect. Raw water cannot pass through the colloid, thereby playing the role of separating the water inlet channel 20 .

[0064] It should also be noted that due to the selective permeability of the water treatment membrane, the solvent (usually water) passes 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. When the two mass transfer processes reach dynamic equilibrium, the concentration on 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 rate V = Q / (L*T), where Q is the raw water flow rate, L is the length of the water inlet channel 20 (i.e., L is the length of the cross section of the water inlet section 210 perpendicular to the fluid flow direction), and T is the thickness of the water inlet channel 20, when the raw water flow rate is constant, the water inlet channel 20 is divided into multiple water inlet sections 210 by setting a partition 30, and the water inlet channel 20 becomes narrower, thereby increasing the raw water flow rate and reducing the concentration polarization phenomenon on the membrane surface.

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

[0067] By staggering the separators 30 connected to the third side 130 and the separators 30 connected to the fourth side 140 in the first direction to form a spiral water inlet channel 20, the flow direction of the fluid is changed multiple times, the filtering path of the raw water in the water inlet channel 20 is further extended, the contact time between the raw water and the diaphragm body 10 is increased, and the filtering effect and water production efficiency are improved. At the same time, the raw water is filtered in a spiral flow through the spiral water inlet channel 20, so that the shear flow rate at the concentrated water end becomes larger, the concentration polarization caused by the poor water quality at the concentrated water end is reduced, the pollution of the diaphragm body 10 is further reduced, the reliability of the diaphragm body 10 is improved, and the service life of the diaphragm body 10 is extended.

[0068] It should be noted that if Figure 1 As shown, when the number of the separator 30 is one, one end of the separator 30 is connected to the fourth side 140, and the other end is spaced apart from the third side 130. Figure 2 As shown, when the number of partitions 30 is an odd number, the raw water inlet 1101 is located at the end of the first side 110 away from the central tube 40, and the concentrated water outlet 1201 is located at the end of the second side 120 away from the central tube 40; when the number of partitions 30 is an even number, the raw water inlet 1101 can be set at the end of the first side 110 away from the central tube 40, and the concentrated water outlet 1201 can be set at the end of the second side 120 close to the central tube 40, so as to avoid the fluid flowing out directly from the concentrated water outlet 1201 without passing through the water inlet section 210.

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

[0070] Embodiment 3

[0071] like Figure 1 As shown, the diaphragm structure includes a diaphragm group and at least one separator 30; the diaphragm group includes a diaphragm body 10, the diaphragm body 10 is at least two layers, and at least two layers of diaphragm bodies 10 are stacked in sequence, and the front faces of the two adjacent layers of diaphragm bodies 10 are arranged facing each other to form an inlet channel 20; and the diaphragm body 10 has a first side 110 and a second side 120 that are arranged opposite to each other in a first direction, and a raw water inlet 1101 connected to the inlet channel 20 is arranged on the first side 110, and a concentrated water outlet 1201 connected to the inlet channel 20 is arranged on the second side 120; at least one separator 30 is arranged in the inlet channel 20, and the separator 30 is constructed to be able 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 diaphragm body 10 respectively, and setting a partition 30 in the water inlet channel 20 to separate the water inlet channel 20, the existing water inlet channel 20 in which raw water enters and exits in a straight line from the end face of the diaphragm body 10 is changed, and the flow path of the raw water in the water inlet channel 20 is extended, thereby extending the filtration path of the raw water in the water inlet channel 20, increasing the contact time between the raw water and the diaphragm body 10, and improving the filtration effect and water production efficiency. By setting a partition 30 to separate the water inlet channel 20, the water inlet channel 20 can be narrowed, the membrane surface flow rate can be increased, and the membrane surface flushing force can be increased, thereby weakening the concentration polarization layer phenomenon on the membrane surface, improving the anti-pollution ability of the diaphragm structure, delaying the scaling rate, and increasing the service life of the diaphragm 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; 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 diaphragm body 10 refers to the side through which water molecules can permeate under high pressure, that is, the side of the diaphragm body 10 used to form the water inlet channel 20; correspondingly, the other side of the diaphragm body 10 is the reverse side.

[0075] It should also be noted that the diaphragm body 10 has two layers, and the two layers of the diaphragm body 10 are stacked in sequence. They can be formed by two diaphragm bodies 10 stacked in sequence, or by a diaphragm body 10 with its front side folded inward to form two layers.

[0076] It should also be noted that the separator 30 is a colloid formed by solidifying glue, which is arranged on the front side of the diaphragm body 10 and has a sealing effect. Raw water cannot pass through the colloid, thereby playing the role of separating the water inlet channel 20 .

[0077] It should also be noted that due to the selective permeability of the water treatment membrane, the solvent (usually water) passes 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. When the two mass transfer processes reach dynamic equilibrium, the concentration on 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 rate V = Q / (L*T), where Q is the raw water flow rate, L is the length of the water inlet channel 20 (i.e., L is the length of the cross section of the water inlet section 210 perpendicular to the fluid flow direction), and T is the thickness of the water inlet channel 20, when the raw water flow rate is constant, the water inlet channel 20 is divided into multiple water inlet sections 210 by setting a partition 30, and the water inlet channel 20 becomes narrower, thereby increasing the raw water flow rate and reducing the concentration polarization phenomenon on the membrane surface.

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

[0080] By staggering the separators 30 connected to the third side 130 and the separators 30 connected to the fourth side 140 in the first direction to form a spiral water inlet channel 20, the flow direction of the fluid is changed multiple times, the filtering path of the raw water in the water inlet channel 20 is further extended, the contact time between the raw water and the diaphragm body 10 is increased, and the filtering effect and water production efficiency are improved. At the same time, the raw water is filtered in a spiral flow through the spiral water inlet channel 20, so that the shear flow rate at the concentrated water end becomes larger, the concentration polarization caused by the poor water quality at the concentrated water end is reduced, the pollution of the diaphragm body 10 is further reduced, the reliability of the diaphragm body 10 is improved, and the service life of the diaphragm body 10 is extended.

[0081] It should be noted that if Figure 1 As shown, when the number of the separator 30 is one, one end of the separator 30 is connected to the fourth side 140, and the other end is spaced apart from the third side 130. Figure 2 As shown, when the number of partitions 30 is an odd number, the raw water inlet 1101 is located at the end of the first side 110 away from the central tube 40, and the concentrated water outlet 1201 is located at the end of the second side 120 away from the central tube 40; when the number of partitions 30 is an even number, the raw water inlet 1101 can be set at the end of the first side 110 away from the central tube 40, and the concentrated water outlet 1201 can be set at the end of the second side 120 close to the central tube 40, so as to avoid the fluid flowing out directly from the concentrated water outlet 1201 without passing through the water inlet section 210.

[0082] It should also be noted that the fourth side 140 is a side away 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 partition 30 in the second direction is L2, and the length of the diaphragm body 10 in the second direction is L3; wherein L1, L2 and L3 satisfy the following relationship, 1 / 15≤L 1 / L 3≤1 / 2, L2>L3-L1.

[0084] By setting the length relationship between the raw water inlet 1101, the separator 30, and the diaphragm body 10 in the second direction, the length of the separator 30 in the second direction is limited, so as to avoid the separator 30 being too short, resulting in the raw water flowing in the water inlet channel 20 not changing its flow direction and flowing out directly in a straight line. By setting the length relationship between the raw water inlet 1101 and the diaphragm body 10 in the second direction, the length of the raw water inlet 1101 in the second direction is limited, so as to ensure that the reliability of the diaphragm body 10 is guaranteed while meeting the water production efficiency requirements, and to avoid the raw water inlet 1101 being too long, resulting in a reduction in the length of the raw water flow channel, and the high-pressure environment of the raw water inlet 1101 will threaten the connection reliability between the pure water guide cloth 60 and the reverse osmosis membrane corresponding to the raw water inlet 1101.

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

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

[0087] It should be noted that if 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 smaller 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 water inlet channel 20 from the raw water inlet 1101, a part of the raw water penetrates to the back side of the diaphragm body 10 under the action of pressure to form pure water, and the other part of the raw water flows out from the concentrated water outlet 1201 along the water inlet channel 20. The flow rate of the raw water will become smaller and smaller, resulting in a decrease in the membrane surface flow rate. Therefore, by limiting the length of multiple water inlet sections 210 in the first direction to decrease with the increase of the distance between the water inlet section 210 and the raw water inlet 1101, the membrane surface flow rate can be increased and the concentration polarization layer phenomenon on the membrane surface can be weakened.

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

[0090] By providing an inclined partition 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 becomes narrower, thereby further increasing the membrane surface flow rate, weakening the concentration polarization layer phenomenon on the membrane surface, improving the anti-pollution ability of the membrane body 10, and extending the service life.

[0091] It should be noted that if Figure 1 , Figure 2 As shown, the separator 30 is parallel to the second direction; Figure 3 As shown, the partition 30 is arranged obliquely to the second direction, and the angle between the partition 30 and the second direction can be set as needed, and the present application does not impose any specific limitation.

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

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

[0094] The central tube 40 is provided to support and fix the fluid; the water inlet screen 50 is provided to ensure that the fluid can be evenly distributed on the surface of the diaphragm body 10, which plays a buffering and protective role and prevents larger particles in the fluid from directly impacting the surface of the diaphragm body 10. The pure water guide cloth 60 is provided to converge and guide the pure water to be discharged.

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

[0096] It should also be noted that the front side of the diaphragm body 10 is folded inward, and an opening is formed at the end of the diaphragm body 10 away from the folded edge, which is connected to the center tube 40. A raw water inlet 1101 and a concentrated water outlet 1201 are reserved on each edge of the first side 110 and the second side 120, and the rest of the places are closed and sealed to form a water inlet channel 20; the pure water guide cloth 60 and the edges of the diaphragm body 10 on the first side 110, the second side 120, and the third side 130 are closed and sealed to form a water production channel 70, and a pure water outlet 710 is reserved on the edge on the fourth side 140.

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

[0098] It should be noted that multiple diaphragm groups can be arranged at equal intervals around the central tube 40, so as to avoid multiple diaphragm groups being fixed at the same position of the central tube 40, so that multiple diaphragm groups are staggered in the circumferential direction to further improve the water production efficiency; for example, the staggered distance between two adjacent layers of diaphragm groups is P1, the outer circumference of the central tube 40 is P2, and the number of diaphragm groups is n, then P1=P2 / n.

[0099] It should also be noted that two adjacent membrane groups can share a pure water guide cloth 60 , and the pure water guide cloth 60 is connected to the reverse sides of the two adjacent membrane groups respectively to form a water production channel 70 .

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

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

[0102] Embodiment 4

[0103] like Figure 4As shown, the diaphragm structure includes a diaphragm group and at least one separator 30; the diaphragm group includes a diaphragm body 10, the diaphragm body 10 is at least two layers, and at least two layers of diaphragm bodies 10 are stacked in sequence, and the front faces of the two adjacent layers of diaphragm bodies 10 are arranged facing each other to form an inlet channel 20; and the diaphragm body 10 has a first side 110 and a second side 120 that are arranged opposite to each other in a first direction, and a raw water inlet 1101 connected to the inlet channel 20 is arranged on the first side 110, and a concentrated water outlet 1201 connected to the inlet channel 20 is arranged on the second side 120; at least one separator 30 is arranged in the inlet channel 20, and the separator 30 is constructed to be able 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 diaphragm body 10 respectively, and setting a partition 30 in the water inlet channel 20 to separate the water inlet channel 20, the existing water inlet channel 20 in which raw water enters and exits in a straight line from the end face of the diaphragm body 10 is changed, and the flow path of the raw water in the water inlet channel 20 is extended, thereby extending the filtration path of the raw water in the water inlet channel 20, increasing the contact time between the raw water and the diaphragm body 10, and improving the filtration effect and water production efficiency. By setting a partition 30 to separate the water inlet channel 20, the water inlet channel 20 can be narrowed, the membrane surface flow rate can be increased, and the membrane surface flushing force can be increased, thereby weakening the concentration polarization layer phenomenon on the membrane surface, improving the anti-pollution ability of the diaphragm structure, delaying the scaling rate, and increasing the service life of the diaphragm 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; 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 diaphragm body 10 refers to the side through which water molecules can permeate under high pressure, that is, the side of the diaphragm body 10 used to form the water inlet channel 20; correspondingly, the other side of the diaphragm body 10 is the reverse side.

[0107] It should also be noted that the diaphragm body 10 has two layers, and the two layers of the diaphragm body 10 are stacked in sequence. They can be formed by two diaphragm bodies 10 stacked in sequence, or by a diaphragm body 10 with its front side folded inward to form two layers.

[0108] It should also be noted that the separator 30 is a colloid formed by solidifying glue, which is arranged on the front side of the diaphragm body 10 and has a sealing effect. Raw water cannot pass through the colloid, thereby playing the role of separating the water inlet channel 20 .

[0109] It should also be noted that due to the selective permeability of the water treatment membrane, the solvent (usually water) passes 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. When the two mass transfer processes reach dynamic equilibrium, the concentration on 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 rate V = Q / (L*T), where Q is the raw water flow rate, L is the length of the water inlet channel 20 (i.e., L is the length of the cross section of the water inlet section 210 perpendicular to the fluid flow direction), and T is the thickness of the water inlet channel 20, when the raw water flow rate is constant, the water inlet channel 20 is divided into multiple water inlet sections 210 by setting a partition 30, and the water inlet channel 20 becomes narrower, thereby increasing the raw water flow rate and reducing the concentration polarization phenomenon on the membrane surface.

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

[0112] By staggering the partitions 30 connected to the first side 110 and the partitions 30 connected to the second side 120 in the second direction to form a spiral water inlet channel 20, the flow direction of the fluid is changed multiple times, the filtering path of the raw water in the water inlet channel 20 is further extended, the contact time between the raw water and the diaphragm body 10 is increased, and the filtering effect and water production efficiency are improved. At the same time, the raw water is filtered in a spiral flow through the spiral water inlet channel 20, so that the shear flow rate at the concentrated water end becomes larger, the concentration polarization caused by the poor water quality at the concentrated water end is reduced, the pollution of the diaphragm body 10 is further reduced, the reliability of the diaphragm body 10 is improved, and the service life of the diaphragm body 10 is extended.

[0113] It should be noted that when the number of the separator 30 is one, one end of the separator 30 may be connected to the first side 110, and the other end may be spaced apart from the second side 120; or one end may be connected to the second side 120, and the other end may be spaced apart from the first side 110; in addition, Figure 4As shown, the raw water inlet 1101 is located at one end of the first side 110 away from the central tube 40 , and the concentrated water outlet 1201 is located at one end of the second side 120 away from the central tube 40 .

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

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

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

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

[0118] Embodiment 5

[0119] like Figure 4 As shown, the diaphragm structure includes a diaphragm group and at least one separator 30; the diaphragm group includes a diaphragm body 10, the diaphragm body 10 is at least two layers, and at least two layers of diaphragm bodies 10 are stacked in sequence, and the front faces of the two adjacent layers of diaphragm bodies 10 are arranged facing each other to form an inlet channel 20; and the diaphragm body 10 has a first side 110 and a second side 120 that are arranged opposite to each other in a first direction, and a raw water inlet 1101 connected to the inlet channel 20 is arranged on the first side 110, and a concentrated water outlet 1201 connected to the inlet channel 20 is arranged on the second side 120; at least one separator 30 is arranged in the inlet channel 20, and the separator 30 is constructed to be able 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 diaphragm body 10 respectively, and setting a partition 30 in the water inlet channel 20 to separate the water inlet channel 20, the existing water inlet channel 20 in which raw water enters and exits in a straight line from the end face of the diaphragm body 10 is changed, and the flow path of the raw water in the water inlet channel 20 is extended, thereby extending the filtration path of the raw water in the water inlet channel 20, increasing the contact time between the raw water and the diaphragm body 10, and improving the filtration effect and water production efficiency. By setting a partition 30 to separate the water inlet channel 20, the water inlet channel 20 can be narrowed, the membrane surface flow rate can be increased, and the membrane surface flushing force can be increased, thereby weakening the concentration polarization layer phenomenon on the membrane surface, improving the anti-pollution ability of the diaphragm structure, delaying the scaling rate, and increasing the service life of the diaphragm 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; 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 diaphragm body 10 refers to the side through which water molecules can permeate under high pressure, that is, the side of the diaphragm body 10 used to form the water inlet channel 20; correspondingly, the other side of the diaphragm body 10 is the reverse side.

[0123] It should also be noted that the diaphragm body 10 has two layers, and the two layers of the diaphragm body 10 are stacked in sequence. They can be formed by two diaphragm bodies 10 stacked in sequence, or by a diaphragm body 10 with its front side folded inward to form two layers.

[0124] It should also be noted that the separator 30 is a colloid formed by solidifying glue, which is arranged on the front side of the diaphragm body 10 and has a sealing effect. Raw water cannot pass through the colloid, thereby playing the role of separating the water inlet channel 20 .

[0125] It should also be noted that due to the selective permeability of the water treatment membrane, the solvent (usually water) passes 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. When the two mass transfer processes reach dynamic equilibrium, the concentration on 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 rate V = Q / (L*T), where Q is the raw water flow rate, L is the length of the water inlet channel 20 (i.e., L is the length of the cross section of the water inlet section 210 perpendicular to the fluid flow direction), and T is the thickness of the water inlet channel 20, when the raw water flow rate is constant, the water inlet channel 20 is divided into multiple water inlet sections 210 by setting a partition 30, and the water inlet channel 20 becomes narrower, thereby increasing the raw water flow rate and reducing the concentration polarization phenomenon on the membrane surface.

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

[0128] By staggering the partitions 30 connected to the first side 110 and the partitions 30 connected to the second side 120 in the second direction to form a spiral water inlet channel 20, the flow direction of the fluid is changed multiple times, the filtering path of the raw water in the water inlet channel 20 is further extended, the contact time between the raw water and the diaphragm body 10 is increased, and the filtering effect and water production efficiency are improved. At the same time, the raw water is filtered in a spiral flow through the spiral water inlet channel 20, so that the shear flow rate at the concentrated water end becomes larger, the concentration polarization caused by the poor water quality at the concentrated water end is reduced, the pollution of the diaphragm body 10 is further reduced, the reliability of the diaphragm body 10 is improved, and the service life of the diaphragm body 10 is extended.

[0129] It should be noted that when the number of the separator 30 is one, one end of the separator 30 may be connected to the first side 110, and the other end may be spaced apart from the second side 120; or one end may be connected to the second side 120, and the other end may be spaced apart from the first side 110; in addition, Figure 4 As shown, the raw water inlet 1101 is located at one end of the first side 110 away from the central tube 40 , and the concentrated water outlet 1201 is located at one end of the second side 120 away from the central tube 40 .

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

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

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

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

[0134] like Figure 4 As shown, in some embodiments, the length of multiple partitions 30 in the first direction increases with the increase of the distance between the partitions 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 partition 30 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.

[0135] By setting the length of multiple partitions 30 in the first direction to increase as the distance between the partitions 30 and the raw water inlet 1101 increases, the length of the outlet of the water inlet section 210 in the first direction decreases as the distance between the water inlet section 210 and the raw water inlet 1101 increases, so as to increase the flow rate of the fluid flowing from the water inlet section 210 into the next fluid section, avoid the decrease of the membrane surface flow rate due to the decrease of the raw water flow rate, thereby increasing the membrane surface flow rate and weakening the membrane surface concentration polarization layer phenomenon. By limiting the length relationship between the partition 30, the water inlet section 210, and the membrane body, it is ensured that the water inlet flow channel 20 gradually decreases in the water flow direction, thereby increasing the membrane surface flow rate and weakening the membrane surface concentration polarization layer 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, thereby ensuring that the flow path of the fluid in each water inlet section 210 flows along the long side of the water inlet section 210, thereby ensuring water production efficiency.

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

[0138] By providing an inclined partition 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 becomes narrower, thereby further increasing the membrane surface flow rate, weakening the concentration polarization layer phenomenon on the membrane surface, improving the anti-pollution ability of the membrane body 10, and extending the service life.

[0139] It should be noted that if Figure 4 As shown, the separator 30 is parallel to the first direction; Figure 5 As shown, the partition 30 is arranged obliquely to the first direction, and the angle between the partition 30 and the first direction can be set as needed, and the present application does not impose any specific limitation.

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

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

[0142] The central tube 40 is provided to support and fix the fluid; the water inlet screen 50 is provided to ensure that the fluid can be evenly distributed on the surface of the diaphragm body 10, which plays a buffering and protective role and prevents larger particles in the fluid from directly impacting the surface of the diaphragm body 10. The pure water guide cloth 60 is provided to converge and guide the pure water to be discharged.

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

[0144] It should also be noted that the front side of the diaphragm body 10 is folded inward, and an opening is formed at the end of the diaphragm body 10 away from the folded edge, which is connected to the center tube 40. A raw water inlet 1101 and a concentrated water outlet 1201 are reserved on each edge of the first side 110 and the second side 120, and the rest of the places are closed and sealed to form a water inlet channel 20; the pure water guide cloth 60 and the edges of the diaphragm body 10 on the first side 110, the second side 120, and the third side 130 are closed and sealed to form a water production channel 70, and a pure water outlet 710 is reserved on the edge on the fourth side 140.

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

[0146] It should be noted that multiple diaphragm groups can be arranged at equal intervals around the central tube 40, so as to avoid multiple diaphragm groups being fixed at the same position of the central tube 40, so that multiple diaphragm groups are staggered in the circumferential direction to further improve the water production efficiency; for example, the staggered distance between two adjacent layers of diaphragm groups is P1, the outer circumference of the central tube 40 is P2, and the number of diaphragm groups is n, then P1=P2 / n.

[0147] It should also be noted that two adjacent membrane groups can share a pure water guide cloth 60 , and the pure water guide cloth 60 is connected to the reverse sides of the two adjacent membrane groups respectively to form a water production channel 70 .

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

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

[0150] Embodiment 6

[0151] An embodiment of the present invention further provides a water purification device, comprising the diaphragm structure of any embodiment of the present invention, 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 may be made thereto and parts thereof may be replaced by equivalents without departing from the scope of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. 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 diaphragm group, the diaphragm group comprising a diaphragm body, the diaphragm body having at least two layers, and at least two layers of the diaphragm body being stacked in sequence, and the front faces of the diaphragm bodies of two adjacent layers being arranged facing each other to form a water inlet channel; and the diaphragm body having a first side and a second side being arranged opposite to each other in a first direction, the first side being provided with a raw water inlet connected to the water inlet channel, and the second side being provided with a concentrated water outlet connected to the water inlet channel; as well as At least one partition is disposed in the water inlet channel, and the partition is configured to partition the water inlet channel to increase the flow rate of the fluid in 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 arranged opposite to each other in the second direction; the diaphragm structure includes a plurality of separators, the plurality of separators extend along the second direction, one end of a portion of the plurality of separators is connected to the third side, and the other end is spaced apart from the fourth side; Another part of the plurality of separators has one end connected to the fourth side and the other end spaced apart from the third side; Among them, a plurality of the separators are arranged at intervals along the first direction, and the separators connected to the third side and the separators connected to the fourth side are arranged alternately along the first direction to form a water inlet section between two adjacent separators.

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 partition in the second direction is L2, and the length of the diaphragm body in the second direction is L3; wherein L1, L2 and L3 satisfy the following relationship: 1 / 15≤L 1 / L 3≤1 / 2, L2>L3-L1.

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

5. The diaphragm structure according to any one of claims 2 to 4, characterized in that: The partition is parallel to the second direction; or The partition is arranged obliquely to 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 arranged opposite to each other in the second direction; the diaphragm structure includes a plurality of separators, the plurality of separators extend along the first direction, one end of a portion of the plurality of separators is connected to the first side, and the other end is spaced from the second side; Another part 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 separators are arranged at intervals along the second direction, and the separators connected to the first side and the separators connected to the second side are arranged alternately along the second direction to form a water inlet section between two adjacent separators.

7. The diaphragm structure according to claim 6, characterized in that: The lengths of the plurality of water inlet sections in the second direction decrease 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 lengths of the plurality of partitions in the first direction increase as the distance between the partitions and the raw water inlet increases; 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 partition 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 to 8, characterized in that: The partition is parallel to the first direction; or The partition is arranged obliquely to 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 a reverse osmosis membrane, a nanofiltration membrane and a micromembrane filtration membrane.

11. The diaphragm structure according to claim 1, characterized in that: The diaphragm structure also includes a central tube, and the diaphragm group can be wound on the central tube; The diaphragm group also includes a water inlet screen and a pure water guide cloth. The water inlet screen is arranged in the water inlet channel; the pure water guide cloth is arranged on the reverse side of the diaphragm body to form a water production channel stacked with the water inlet channel. A pure water outlet is arranged at one end of the water production channel away from the central tube.

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

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

14. A water purification device, characterized in that: The invention comprises a diaphragm structure as claimed in any one of claims 1 to 13.

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