A seawater flow channel cloth structure with segmented weaving density and a reverse osmosis membrane element

Abstract

This application relates to a seawater flow channel cloth structure with segmented weaving density and a reverse osmosis membrane element, belonging to the field of reverse osmosis membrane elements. The seawater flow channel cloth structure with segmented weaving density includes a flow channel cloth. One side edge of the flow channel cloth is set as a connection edge. The flow channel cloth has a filtration area and a glue line area. The shape of the glue line area is "凵"-shaped. The filtration area is located within the area surrounded by the glue line area. The opening of the glue line area is the connection edge. The weaving density of the glue line area is 50%-70% of the weaving density of the filtration area. This application can have both the compressive strength of the flow channel cloth and high glue permeability.

Description

Technical Field

[0001] This application relates to the field of reverse osmosis membrane elements, and particularly to a seawater flow channel cloth structure with segmented weaving density and a reverse osmosis membrane element. Background Art

[0002] With the increasing shortage of water resources and the wide application of reverse osmosis technology, the popularization of reverse osmosis products is inevitable, and the membrane elements of seawater desalination technology are particularly important.

[0003] Since seawater desalination membrane elements are basically used under high pressure, the compressive capacity of the flow channel cloth is crucial. If the compressive capacity does not meet the standard, the membrane sheets on both sides of the flow channel cloth are more likely to squeeze the flow channel cloth, resulting in a reduction in the water passing capacity of the flow channel cloth.

[0004] Therefore, the weaving density is one of the important indicators of the compressive capacity, that is, the higher the weaving density of the flow channel cloth, the stronger its compressive capacity.

[0005] However, too high a weaving density makes it difficult for the glue to penetrate through the flow channel cloth, easily causing insufficient bonding strength of the membrane sheet or uneven curing of the glue, and then resulting in unqualified reverse osmosis membrane elements. Summary of the Invention

[0006] In order to combine the compressive strength of the flow channel cloth and high glue permeability, this application provides a seawater flow channel cloth structure with segmented weaving density and a reverse osmosis membrane element.

[0007] A seawater flow channel cloth structure with segmented weaving density provided by this application adopts the following technical solution:

[0008] A seawater flow channel cloth structure with segmented weaving density includes a flow channel cloth. One side edge of the flow channel cloth is set as a connecting edge. The flow channel cloth has a filtering area and a glue line area. The shape of the glue line area is "U", the filtering area is located within the area surrounded by the glue line area, the opening of the glue line area is the connecting edge, and the weaving density of the glue line area is 50%-70% of the weaving density of the filtering area.

[0009] By adopting the above technical solution, by limiting the weaving densities of the glue line area and the filtering area, the high-weaving-density filtering area can play a good role in resisting the pressure of the membrane sheet, thereby ensuring the water passing capacity. And for the low-weaving-density glue line area, the glue can easily and evenly penetrate to the other side of the flow channel cloth, enabling the flow channel cloth and the membrane sheet to be better bonded together, thus reducing the occurrence of low bonding strength caused by uneven glue or poor permeability, and also reducing the phenomenon of easy glue leakage caused by different materials of the flow channel cloth and the viscosity of the glue.

[0010] Optionally, the flow channel cloth further has a side line area, the side line area is in the shape of "U", and the side line area surrounds the glue line area. The weaving density of the side line area is equal to the weaving density of the filtering area.

[0011] By adopting the above technical solution, by setting a high weaving density edge line area, the weaving density of the edge line area is consistent with that of the filter area, and the two can lock the glue in the glue line area to reduce the flow and loss of glue, thereby increasing the glue bonding strength and reducing the problem of excessive glue overflow after the membrane element is rolled up.

[0012] Optionally, the flow channel cloth is divided into two cloth layers along its thickness direction, both cloth layers have the filter area and the glue line area, a fish wire net is sandwiched between the two cloth layers, and the size of the fish wire net is equal to the size of the filter area.

[0013] By adopting the above technical solution, a fish wire net is set up, and the two cloth layers sandwich the fish wire net. The fish wire net is equivalent to the skeleton of the flow channel cloth to further improve the pressure resistance of the flow channel cloth. At the same time, the cloth layer plays a buffering and protective role to prevent the fish wire net from directly contacting the diaphragm and causing damage to the diaphragm. Moreover, when the pressure resistance of the flow channel cloth meets the requirements, the weaving density of the filter area can be reduced to make the pores larger, thereby increasing the water flow rate.

[0014] Optionally, the flow channel cloth is divided into two cloth layers along its thickness direction, and the two cloth layers both have the filtering area and the glue line area; a cloth surface tightening structure is provided between the two cloth layers, and the cloth surface tightening structure includes multiple groups of guide strips and multiple W-shaped strips which are arranged one by one corresponding to each group of guide strips, the length direction of the guide strips is the length direction of the cloth layer, and each group of guide strips is arranged at intervals along the width direction of the cloth layer, and one group of guide strips includes two guide strips, which are bonded and fixed to opposite surfaces of the cloth layer, and the cross section of the guide strips is a right triangle, and the inclined surfaces of the two guide strips in the same group are arranged opposite to each other, and the area of ​​the cloth layer between the two guide strips in the same group is set as the contraction area, and the The area of ​​the fabric layer located between two adjacent groups of guide strips is set as a tensioning area, the guide strip of one of the fabric layers is set as a first guide strip, and the guide strip of the other fabric layer is set as a second guide strip, and the distance between the two first guide strips in the same group is smaller than the distance between the two second guide strips in the same group; the length direction of the W-shaped strip is the length direction of the fabric layer, the cross-section of the W-shaped strip is W-shaped, and the W-shaped strip includes an inverted V-shaped plate and two inclined plates, the two inclined plates are respectively fixed on both sides of the inverted V-shaped plate, the inclined surfaces of the two inclined plates are respectively attached to the inclined surfaces of the two second guide strips in the same group, and the two inclined surfaces of the inverted V-shaped plate are respectively attached to the inclined surfaces of the two first guide strips in the same group.

[0015] By adopting the above technical solution, after the flow channel cloth is rolled and formed, under the winding pressure (the direction of the winding pressure is radial), the two cloth layers are close to each other, and the first guide strip and the second guide strip are respectively displaced relative to the W-shaped strip, and the winding pressure is converted into a force forcing the two first guide strips to approach each other and forcing the two second guide strips to approach each other through the cooperation between the inclined surface of the second guide strip and the inclined surface of the inclined plate and the cooperation between the first guide strip and the inverted V-shaped plate, thereby forcing the area of ​​the cloth layer located between the two adjacent groups of guide strips to be tightened, that is, the tightening area is tightened and the contraction area is contracted, and the tightened tightening area has a stronger pressure resistance, and, when the pressure resistance of the flow channel cloth meets the requirements, the weaving density of the filter area can be reduced to make the pores larger, thereby increasing the water flow rate.

[0016] Optionally, the flow channel cloth is divided into two cloth layers along its thickness direction, and the two cloth layers both have the filtering area and the glue line area; a cloth surface tightening structure is arranged between the two cloth layers, and the cloth surface tightening structure includes multiple groups of first fish silk threads, multiple second fish silk threads corresponding to each group of first fish silk threads one by one, and a rack piece, the length direction of the first fish silk threads is the length direction of the cloth layer, each group of first fish silk threads is arranged at intervals along the width direction of the cloth layer, a group of first fish silk threads includes two first fish silk threads, and the first fish silk threads are sewn to the cloth layer, and the area of ​​the cloth layer located between the two first fish silk threads in the same group is set as the contraction area, and the area of ​​the cloth layer located between the adjacent first fish silk threads is set as the contraction area. The area between the two groups of first fishing lines is set as a tensioning area, and the part where the first fishing lines are exposed to the cloth layer is set as a connecting part. The connecting parts of the two first fishing lines in the same group are staggered along the length direction of the first fishing lines; the second fishing line bypasses each connecting part in turn; there are two rack pieces, and the length direction of the rack pieces is the length direction of the cloth layer. Both rack pieces are constrained in the space enclosed by the second fishing line, the contraction area and the two first fishing lines in the same group. The opposite sides of the two rack pieces have serrations, and the serrations of the two rack pieces are engaged with each other. The two ends of the second fishing line are respectively fixedly connected to the separated ends of the two rack pieces.

[0017] By adopting the above technical solution, before the runner cloth is rolled, the first fish thread is first sewn to the cloth layer, and then two rack pieces are placed between the two first fish threads, the saw teeth of the two rack pieces are engaged with each other, and then the second fish thread is passed around each connection part in turn, and the running direction of the second fish thread is the length direction of the cloth layer, which is also the length direction of the rack piece, and then the two ends of the second fish thread are respectively fixedly connected to the separated ends of the two rack pieces, and the fixing method can be binding or bonding, and then one of the rack pieces is moved along the thickness direction of the cloth layer, so that the two rack pieces are misaligned and the saw teeth are disengaged, and then the two rack pieces are respectively moved along the length direction of the cloth layer to tighten the second fish thread, thereby driving the first fish threads on both sides. The connecting parts are close to each other, so that the contraction area contracts and the tensioning area is tightened. At the same time, the second fish thread is tightened and the rack piece is pressed against the surface of the cloth layer, so that the two rack pieces are in the same horizontal position, and the saw teeth of the two rack pieces are engaged with each other, and the engaged saw teeth constrain the movement of the rack pieces, thereby limiting the tightened second fish thread, and then limiting the tensioning area. At the same time, the two rack pieces are constrained in the space surrounded by the second fish thread, the contraction area and the two first fish threads in the same group, completing the entire tightening action. At this time, the tightened tensioning area has a strong pressure resistance, and, when the pressure resistance of the flow channel cloth meets the requirements, the weaving density of the filter area can be reduced to make the pores larger, thereby increasing the water flow rate.

[0018] Optionally, nano calcium carbonate powder is spread on both sides of the glue line area.

[0019] By adopting the above technical solution, after brushing glue on the glue line area, nano calcium carbonate powder is spread on the front and back sides of the glue line area, and the glue will gradually penetrate into the nano calcium carbonate powder. The surface area of ​​the nano calcium carbonate powder is large, which can greatly improve the bonding effect of the glue. After the composition of the glue and the nano calcium carbonate powder is hardened, the hardening and shaping effect of the glue line area is improved, thereby forming a stable retaining wall.

[0020] The present application provides a reverse osmosis membrane element, which adopts the following technical solution:

[0021] A reverse osmosis membrane element comprises a central tube and a membrane unit. The central tube has a plurality of water inlet holes. The membrane unit is wound around the central tube. The membrane unit comprises a diaphragm, a water inlet mesh and a seawater flow channel cloth structure with segmented weaving density. The connecting edge of the flow channel cloth is fixed to the central tube.

[0022] Optionally, it also includes two tensioning structures, the axial length of the flow cloth is greater than the axial length of the diaphragm and the water inlet mesh cloth; the tensioning structure includes an inner ring sleeve, a spring and a plurality of steel sheets, both sides of the flow cloth in the length direction are sewn with cloth sleeves, and the two inner ring sleeves are respectively slidably sleeved on the two ends of the center tube, the steel sheet passes through the cloth sleeve, and one end of the steel sheet is radially inserted into the inner ring sleeve, and the elastic force of the spring is used to force the inner ring sleeve to slide axially away from the middle of the center tube; the glue line area includes two first bonding sections and one second bonding section, wherein the first bonding section extends along the width direction of the flow cloth, and the second bonding section extends along the length direction of the flow cloth; both surfaces of the first bonding section are covered with a first release film, and both ends of the first release film have tear tongues, which extend to the outside of the flow cloth; both surfaces of the second bonding section are covered with the first release film, and one end of the second release film has a pull tape, which extends to the outside of the flow cloth.

[0023] By adopting the above technical solution, a tensioning structure is set to apply axial force to the flow channel cloth, so that the flow channel cloth in a wound state is in a taut state, and the taut flow channel cloth has a stronger pressure resistance. Moreover, when the pressure resistance of the flow channel cloth meets the requirements, the weaving density of the filter area can be reduced to make the pores larger, thereby increasing the water flow rate.

[0024] Furthermore, by setting the first release film and the second release film, the runner cloth, the diaphragm and the water inlet mesh cloth are overlapped and then rolled. During this process, the first release film and the second release film lock the glue in the glue line area to prevent the diaphragm from adhering to the runner cloth, so as to facilitate pulling and tightening the runner cloth in a free state. After pulling, the first release film and the second release film are pulled away, and the glue flows out under the rolling pressure, thereby completing the bonding. In addition, the membrane unit in the rolled state can be rotated at a high speed, and the glue flows out faster under the action of centrifugal force, thereby further improving the glue bonding effect.

[0025] Optionally, a plurality of tear lines are provided on the surface of the first release film, the tear lines extend along the length direction of the runner cloth, and the tear lines are staggered along the width direction of the runner cloth.

[0026] In summary, the present application includes at least one of the following beneficial technical effects:

[0027] By limiting the weaving density of the glue line area and the filter area, the high weaving density filter area can play a good role in resisting the pressure of the diaphragm, thereby ensuring the amount of water flowing through, while the low weaving density glue line area allows the glue to easily and evenly penetrate to the other side of the runner cloth, so that the runner cloth and the diaphragm are better bonded together, thereby reducing the occurrence of low bonding strength caused by uneven glue or poor permeability, and also reducing the easy leakage of glue lines caused by runner cloths of different materials and glue viscosities;

[0028] By setting a high-weaving density edge area, the edge area and the filter area have the same weaving density, which can lock the glue in the glue line area to reduce the flow and loss of glue, thereby increasing the glue bonding strength and reducing the problem of excessive glue overflow after the membrane element is rolled up;

[0029] By setting a fish wire net, the two cloth layers sandwich the fish wire net, which is equivalent to the skeleton of the channel cloth, so as to further improve the pressure resistance of the channel cloth. At the same time, the cloth layer plays a buffering and protective role to prevent the fish wire net from directly contacting the diaphragm and causing damage to the diaphragm. In addition, when the pressure resistance of the channel cloth meets the requirements, the weaving density of the filter area can be reduced to make the pores larger, thereby increasing the water flow rate;

[0030] By setting the cloth surface tensioning structure, the tensioned tensioning area has a stronger pressure resistance, and, when the pressure resistance of the flow channel cloth meets the requirements, the weaving density of the filter area can be reduced, so that the pores are larger, thereby increasing the water flow rate;

[0031] By setting a tensioning structure to apply axial force to the flow channel cloth, the flow channel cloth in a wound state is in a taut state, and the taut flow channel cloth has a stronger pressure resistance. In addition, when the pressure resistance of the flow channel cloth meets the requirements, the weaving density of the filter area can be reduced to make the pores larger, thereby increasing the water flow rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the separation state of the membrane unit element of Example 1.

[0033] Figure 2 Schematic diagram of the runner cloth of Example 1.

[0034] Figure 3 This is a partial cross-sectional view of the flow channel cloth of Example 2.

[0035] Figure 4 It is a schematic diagram of the fabric layer of Example 2.

[0036] Figure 5 This is a partial cross-sectional view of the flow channel cloth of Example 3.

[0037] Figure 6 yes Figure 5 A partial enlarged view of point A in the middle.

[0038] Figure 7 It is a schematic diagram of the fabric layer of Example 4.

[0039] Figure 8 yes Figure 7 A partial enlarged view of point B in the middle.

[0040] Fig. 9 This is a partial cross-sectional view of the flow channel cloth of Example 4.

[0041] Fig.10 It is a schematic diagram of the flow channel cloth of Example 5.

[0042] Fig.11 4 is a side view of the second release film of Example 5.

[0043] Fig.12 It is a schematic diagram of the tensioning structure of Example 5.

[0044] Fig.13 It is a front view of the tensioning structure of Example 5.

[0045] Fig.14 Schematic diagram of the first release film of Example 6.

[0046] Explanation of reference numerals: 1, channel cloth; 10, center tube; 101, diaphragm; 102, water inlet mesh cloth; 11, connecting edge; 12, filtering area; 13, glue line area; 131, first bonding section; 132, second bonding section; 14, edge line area; 15, cloth layer; 151, fish wire net; 152, tightening area; 153, contraction area; 16, cloth cover; 21, W-shaped strip; 211, inverted V-shaped Plate; 212, inclined plate; 22, guide strip; 221, first guide strip; 222, second guide strip; 23, first fishing line; 231, connecting portion; 25, second fishing line; 26, rack piece; 31, first release film; 311, tear tongue; 312, easy tear line; 32, second release film; 321, drawstring; 51, steel sheet; 52, spring; 53, inner ring sleeve; 54, shoulder. DETAILED DESCRIPTION

[0047] The following is combined with Figure 1 -Attached Fig.14 This application is described in further detail.

[0048] Example 1 discloses a reverse osmosis membrane element, such as Figure 1 and Figure 2 As shown ( Figure 1 The direction of the arrow in the middle is the direction of filtered water), the reverse osmosis membrane element includes a central tube 10 and a membrane unit, the central tube 10 has a plurality of water inlet holes (not shown in the figure), the membrane unit is wound around the central tube 10, and the membrane unit includes a diaphragm 101, a water inlet mesh 102 and a seawater flow channel cloth structure with segmented weaving density.

[0049] The seawater channel cloth structure with segmented weaving density comprises a channel cloth 1 , one side of the channel cloth 1 is set as a connecting edge 11 , and the connecting edge 11 is fixedly connected to the central pipe 10 .

[0050] The flow channel cloth 1 has a filtering area 12, a glue line area 13 and a side line area 14. The shape of the glue line area 13 is "U"-shaped. The filtering area 12 is located within the area enclosed by the glue line area 13. The opening of the glue line area 13 is the connecting edge 11. The weaving density of the glue line area 13 is 50%-70% of the weaving density of the filtering area 12.

[0051] The side line area 14 is "U"-shaped and encloses the glue line area 13. The weaving density of the side line area 14 is equal to the weaving density of the filtering area 12.

[0052] When the membrane unit is rolled, first fold the membrane sheet 101 in half. The folding position of the membrane sheet 101 is close to the central tube 10. The water inlet mesh cloth 102 is clamped between the folded membrane sheets 101. The water inlet mesh cloth 102 can not only reduce the mutual extrusion of the folded membrane sheets 101, but also form a water inlet channel between the folded membrane sheets 101, enabling the raw water to come into contact with the membrane sheet 101 as much as possible for filtration. Then, brush glue on the glue line area 13 of the flow channel cloth 1. The glue penetrates to both sides of the glue line area 13. Then, cover the flow channel cloth 1 on the membrane sheet 101. The glue fixes the flow channel cloth 1 and the membrane sheet 101. Then, cover another membrane sheet 101 on the other side of the flow channel cloth 1. The glue fixes the flow channel cloth 1 and this membrane sheet 101. After the flow channel cloth 1 and the membrane sheets 101 are all bonded, wind the membrane unit around the central tube 10, and the rolling is successful.

[0053] The water production process is as follows: The raw water contacts the membrane sheet 101 through the water inlet channel formed by the water inlet mesh cloth 102. Under the action of pressure, the purified water in the raw water passes through the filtration of the membrane sheet 101. The purified water enters the filtering area 12 of the flow channel cloth 1. Since the glue line area 13 prevents the purified water in the filtering area 12 from flowing out, the purified water in the filtering area 12 enters the central tube 10 through the water inlet holes, that is, the purified water is discharged from the central tube 10.

[0054] The implementation principle of Embodiment 1 is: By limiting the weaving densities of the glue line area 13 and the filtering area 12, the filtering area 12 with a high weaving density can play a good role in resisting the pressure of the membrane sheet 101, thus ensuring the water passing capacity. And the glue line area 13 with a low weaving density enables the glue to easily and evenly penetrate to the other side of the flow channel cloth 1, making the flow channel cloth 1 and the membrane sheet 101 better bonded together, thereby reducing the occurrence of low bonding strength caused by uneven glue or poor permeability, and also reducing the phenomenon of easy glue leakage caused by different materials of the flow channel cloth 1 and the glue viscosity.

[0055] By setting the side line area 14 with a high weaving density, the weaving densities of the side line area 14 and the filtering area 12 are the same. The two can lock the glue in the glue line area 13 to reduce the flow and loss of the glue, thereby increasing the glue bonding strength and reducing the problem of excessive glue overflow after winding the membrane element.

[0056] Embodiment 2. The difference between Embodiment 2 and Embodiment 1 is that, as Figure 3 , Figure 4 As shown, the flow channel cloth 1 is divided into two cloth layers 15 along its thickness direction. Both cloth layers 15 have a filter area 12 and a glue line area 13. A fish wire net 151 is sandwiched between the two cloth layers 15. The size of the fish wire net 151 is equal to that of the filter area 12.

[0057] The fish wire net 151 is equivalent to the skeleton of the channel cloth 1, so as to further improve the pressure resistance of the channel cloth 1 and reduce the occurrence of low water flow due to the pressure deformation of the channel cloth 1. At the same time, the cloth layer 15 plays a buffering and protective role to prevent the fish wire net 151 from directly contacting the diaphragm 101 and causing damage to the diaphragm 101.

[0058] Furthermore, when the pressure resistance of the flow channel cloth 1 meets the requirements, the weaving density of the filter area 12 can be appropriately reduced to make the pores larger, thereby increasing the water flow rate.

[0059] Embodiment 3, embodiment 3 is different from embodiment 1 in that, Figure 5 , Figure 6 As shown (the direction of the solid arrow in the figure is the direction of the winding pressure on the runner cloth 1, and the direction of the hollow arrow is the direction of the tension on the runner cloth 1), the runner cloth 1 is divided into two cloth layers 15 along its own thickness direction, and the two cloth layers 15 both have a filtering area 12 and a glue line area 13, and the two cloth layers 15 both have a connecting edge 11.

[0060] A cloth surface tensioning structure is provided between the two cloth layers 15 and is located in the filter area 12 . The cloth surface tensioning structure is used to convert the winding pressure of the flow channel cloth 1 into a force forcing the flow channel cloth 1 to be partially tightened, thereby improving the pressure resistance of the flow channel cloth 1 .

[0061] Specifically, the cloth surface tensioning structure includes multiple groups of guide strips 22 and multiple W-shaped strips 21 that are arranged one by one corresponding to each group of guide strips 22. The length direction of the guide strips 22 is the length direction of the cloth layer 15 (the length direction of the cloth layer 15 is the axial direction of the central tube 10). Each group of guide strips 22 is arranged at intervals along the width direction of the cloth layer 15. A group of guide strips 22 includes two guide strips 22. The guide strips 22 are bonded and fixed to the opposite surfaces of the cloth layer 15 (the opposite surfaces refer to the surfaces of the cloth layer 15 relative to the other cloth layer 15). The cross-section of the guide strip 22 is a right triangle, and the inclined surfaces of the two guide strips 22 in the same group are arranged opposite to each other.

[0062] The area between two guide strips 22 in the same group of the fabric layer 15 is set as a contraction area 153, the area between two adjacent groups of guide strips 22 of the fabric layer 15 is set as a tensioning area 152, the guide strip 22 of one of the fabric layers 15 is set as a first guide strip 221, and the guide strip 22 of the other fabric layer 15 is set as a second guide strip 222, and the distance between the two first guide strips 221 in the same group is smaller than the distance between the two second guide strips 222 in the same group.

[0063] The W-shaped strip 21 can be made of steel or hard plastic. The length direction of the W-shaped strip 21 is the length direction of the cloth layer 15. The cross-section of the W-shaped strip 21 is W-shaped. The W-shaped strip 21 includes an inverted V-shaped plate 211 and two inclined plates 212. The two inclined plates 212 are respectively fixed on both sides of the inverted V-shaped plate 211. The inclined surfaces of the two inclined plates 212 are respectively attached to the inclined surfaces of the two second guide strips 222 of the same group, and the two inclined surfaces of the inverted V-shaped plate 211 are respectively attached to the inclined surfaces of the two first guide strips 221 of the same group.

[0064] After the flow channel cloth 1 is rolled and formed, under the winding pressure (the direction of the winding pressure is radial), the two cloth layers 15 are forced to approach each other, and the first guide strip 221 and the second guide strip 222 are respectively displaced relative to the W-shaped strip 21. The winding pressure is converted into a force forcing the two first guide strips 221 to approach each other and forcing the two second guide strips 222 to approach each other through the cooperation between the inclined surface of the second guide strip 222 and the inclined surface of the inclined plate 212 and the cooperation between the first guide strip 221 and the inverted V-shaped plate 211, thereby forcing the area of ​​the cloth layer 15 located between the two adjacent groups of guide strips 22 to be tightened, that is, the tightening area 152 is tightened and the contraction area 153 is contracted, and the tightened tightening area 152 has a stronger pressure resistance. In addition, when the pressure resistance of the flow channel cloth 1 meets the requirements, the weaving density of the filter area 12 can be reduced to make the pores larger, thereby increasing the water flow rate.

[0065] Embodiment 4, embodiment 4 is different from embodiment 3 in that, Figure 7 , Figure 8 , Fig. 9 As shown, the cloth surface tensioning structure is used to actively force the runner cloth 1 to be partially tightened, thereby improving the compression resistance of the runner cloth 1.

[0066] Specifically, the cloth surface tensioning structure includes multiple groups of first fish threads 23, multiple second fish threads 25 corresponding to each group of first fish threads 23, and a rack piece 26. The length direction of the first fish threads 23 is the length direction of the cloth layer 15. Each group of first fish threads 23 is arranged at intervals along the width direction of the cloth layer 15. One group of first fish threads 23 includes two first fish threads 23. The first fish threads 23 are sewn to the cloth layer 15. The portion of the first fish threads 23 exposed to the cloth layer 15 is set as a connecting portion 231. The connecting portion 231 is located on the front side of the cloth layer 15 (the front side refers to the surface of the cloth layer 15 facing another cloth layer 15). At the same time, there is a gap between the connecting portion 231 and the front side of the cloth layer 15. The connecting portions 231 of the two first fish threads 23 in the same group are staggered along the length direction of the first fish threads 23, and the portion of the first fish threads 23 located on the back side of the cloth layer 15 is bonded to the back side of the cloth layer 15 by an adhesive.

[0067] The area of ​​the cloth layer 15 between two first fishing threads 23 in the same group is set as a contraction area 153 , and the area of ​​the cloth layer 15 between two adjacent groups of first fishing threads 23 is set as a tensioning area 152 .

[0068] The second fishing line 25 passes around each connection part 231 in sequence. Specifically, the second fishing line 25 first passes through the gap between the connection part 231 and the front side of the cloth layer 15, and then the second fishing line 25 passes around the connection part 231 and extends to another connection part 231, so that the second fishing line 25 is wavy.

[0069] There are two rack pieces 26, and the length direction of the rack pieces 26 is the length direction of the cloth layer 15. The two rack pieces 26 are constrained in the space enclosed by the second fishing line 25, the contraction area 153 and the two first fishing lines 23 of the same group. The opposite sides of the two rack pieces 26 have serrations, and the serrations of the two rack pieces 26 are engaged with each other. The two ends of the second fishing line 25 are fixedly connected to the separated ends of the two rack pieces 26 respectively.

[0070] Before the rolling of the flow channel cloth 1, first stitch the first fishing line 23 to the cloth layer 15, then place two rack pieces 26 between the two first fishing lines 23, and the sawteeth of the two rack pieces 26 are engaged (the connecting part 231 of the two first fishing lines 23 is used to restrict the rack piece 26 from disengaging along the width direction). Then, the second fishing line 25 is sequentially wound around each connecting part 231. The traveling direction of the second fishing line 25 is the length direction of the cloth layer 15 and also the length direction of the rack piece 26. Then, the two ends of the second fishing line 25 are fixedly connected to the separated ends of the two rack pieces 26 (the separated ends refer to the ends of the two rack pieces 26 that are the farthest apart). This fixing method can be tying or bonding. Then, move one of the rack pieces 26 along the thickness direction of the cloth layer 15 so that the two rack pieces 26 are misaligned and the sawteeth are disengaged. Then, move the two rack pieces 26 along the length direction of the cloth layer 15, and the two rack pieces 26 move away from each other to tighten the second fishing line 25, thereby driving the connecting parts 231 of the two first fishing lines 23 on both sides to approach each other, causing the contraction area 153 to contract and the tension area 152 to be tightened. At the same time, when tightened, the second fishing line 25 also presses the rack pieces 26 on the surface of the cloth layer 15, that is, the two rack pieces 26 are in the same horizontal position, and the sawteeth of the two rack pieces 26 are engaged. The engaged sawteeth restrict the movement of the rack pieces 26, thereby limiting the tightened second fishing line 25 and further limiting the tension area 152. At the same time, both rack pieces 26 are constrained within the space surrounded by the second fishing line 25, the contraction area 153, and the two first fishing lines 23 in the same group, completing the entire tightening action. At this time, the tightened tension area 152 has较强抗压能力, and, when the compressive capacity of the flow channel cloth 1 meets the requirements, the weaving density of the filtering area 12 can be reduced, making the pores larger, thereby increasing the water passing volume.

[0071] Example 5. The difference between Example 5 and Example 1 is that, as Fig.10 、 Fig.11 、 Fig.12 、 Fig.13 shown, the glue line area 13 includes two first bonding segments 131 and one second bonding segment 132. Among them, the first bonding segment 131 extends along the width direction of the flow channel cloth 1, and the second bonding segment 132 extends along the length direction of the flow channel cloth 1. The two first bonding segments 131 and one second bonding segment 132 together form a "凵" shape.

[0072] Both surfaces of the first bonding segment 131 are covered with a first release film 31, and both ends of the first release film 31 have tearing tongues 311, and the tearing tongues 311 extend to the outside of the flow channel cloth 1.

[0073] Both surfaces of the second adhesive section 132 are covered with the first release film 31 . One end of the second release film 32 has a drawstring 321 . The drawstring 321 covers the second release film 32 and extends to the outside of the runner cloth 1 .

[0074] The reverse osmosis membrane element also includes two tensioning structures. The axial length of the channel cloth 1 is greater than the axial length of the membrane 101 and the water inlet mesh cloth 102, that is, after rolling, the ends of the channel cloth 1 will be exposed. The two tensioning structures are respectively installed at both ends of the central tube 10. The tensioning structures are used to apply axial force to the exposed ends of the rolled channel cloth 1, so that the wound channel cloth 1 is in a taut state.

[0075] The tensioning structure includes an inner ring sleeve 53, a spring 52 and a plurality of steel sheets 51. Cloth sleeves 16 are sewn on both sides of the flow channel cloth 1 in the length direction. The two inner ring sleeves 53 are respectively slidably sleeved on the two ends of the central tube 10. A shoulder 54 is coaxially fixed on the outer circumference of the central tube 10. The spring 52 is sleeved on the outside of the central tube 10. The two ends of the spring 52 are respectively abutted against the shoulder 54 and the inner ring sleeve 53, that is, the elastic force of the spring 52 is used to force the inner ring sleeve 53 to slide axially away from the middle of the central tube 10.

[0076] The steel sheet 51 may be made of stainless steel or have a corrosion-resistant coating, and the thickness of the steel sheet 51 may be 0.1 mm-0.3 mm, that is, the steel sheet 51 has good plastic deformation ability and is easy to bend.

[0077] Before rolling, glue is first applied to the glue line area 13, and then the first release film 31 and the second release film 32 are attached. The first release film 31 and the second release film 32 lock the glue in the glue line area 13 to prevent the diaphragm 101 from adhering to the runner cloth 1, so as to facilitate the subsequent pulling and tightening of the runner cloth 1 in a free state. Then, the steel sheet 51 passes through the cloth sleeve 16, and one end of the steel sheet 51 is radially inserted into the inner ring sleeve 53, so that the steel sheet 51 is fixedly connected to the runner cloth 1 and the inner ring sleeve 53 respectively. At this time, the spring 5 2 is applied to the runner cloth 1 through the inner ring sleeve 53, the steel sheet 51 and the cloth sleeve 16 to force the runner cloth 1 to be tightened, and then the runner cloth 1 is wound. The steel sheet 51 is plastically deformed into a spiral shape according to the shape of the runner cloth 1. After the membrane unit is wound, the first release film 31 and the second release film 32 are respectively pulled away from the runner cloth 1 through the tear tongue 311 and the pull belt 321. Under the rolling pressure and gravity, the glue flows out to complete the bonding. In order to make the glue more even, the membrane unit can be rotated slowly.

[0078] Furthermore, in order to improve the bonding effect, the rolled membrane unit can be rotated at high speed. Under the action of centrifugal force, the glue flows out faster, thereby further improving the bonding effect of the glue.

[0079] Embodiment 6, embodiment 6 is different from embodiment 5 in that, Fig.14 As shown, a plurality of tear lines 312 are provided on the surface of the first release film 31 , and the tear lines 312 extend along the length direction of the runner cloth 1 . The tear lines 312 are staggered along the width direction of the runner cloth 1 , thereby improving the tearing effect of the first release film 31 .

[0080] Example 7. The difference between Example 7 and Example 1 is that after the glue line area 13 is brushed with glue, nano calcium carbonate powder is spread on the front and back sides of the glue line area 13. The glue will gradually penetrate into the nano calcium carbonate powder. The surface area of ​​the nano calcium carbonate powder is large, which can greatly improve the bonding effect of the glue. After the composition of the glue and the nano calcium carbonate powder is hardened, the hardening and shaping effect of the glue line area 13 is improved, thereby forming a stable retaining wall.

[0081] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A seawater channel fabric structure with segmented weaving density, characterized in that: It includes a flow channel cloth (1). One side edge of the flow channel cloth (1) is set as a connecting edge (11). The flow channel cloth (1) has a filtering area (12) and a glue line area (13). The shape of the glue line area (13) is "U" - shaped. The filtering area (12) is located within the area enclosed by the glue line area (13). The opening of the glue line area (13) is the connecting edge (11). The weaving density of the glue line area (13) is 50% - 70% of the weaving density of the filtering area (12). The flow channel cloth (1) also has a side edge area (14), the side edge area (14) is "U" - shaped, and the side edge area (14) encloses the glue line area (13). The weaving density of the side edge area (14) is equal to the weaving density of the filtering area (12).

2. The seawater channel fabric structure with segmented weaving density according to claim 1 is characterized in that: The flow channel cloth (1) is divided into two cloth layers (15) along its own thickness direction. Both of the two cloth layers (15) have the filtering area (12) and the glue line area (13). A fish silk wire mesh (151) is clamped between the two cloth layers (15). The size of the fish silk wire mesh (151) is equal to the size of the filtering area (12).

3. The seawater channel fabric structure with segmented weaving density according to claim 1 is characterized in that: The flow channel cloth (1) is divided into two cloth layers (15) along its own thickness direction. Both of the two cloth layers (15) have the filtering area (12) and the glue line area (13). A cloth surface tensioning structure is provided between the two cloth layers (15). The cloth surface tensioning structure includes multiple groups of guiding strips (22) and multiple W - shaped strips (21) provided corresponding to each group of guiding strips (22). The length direction of the guiding strips (22) is the length direction of the cloth layer (15). Each group of guiding strips (22) is arranged at intervals along the width direction of the cloth layer (15). One group of guiding strips (22) includes two guiding strips (22). The guiding strips (22) are adhesively fixed to the opposite surfaces of the cloth layer (15). The cross - section of the guiding strip (22) is a right - angled triangle. The inclined surfaces of the two guiding strips (22) in the same group face away from each other. The area of the cloth layer (15) located between the two guiding strips (22) in the same group is set as a contraction area (153). The area of the cloth layer (15) located between adjacent groups of guiding strips (22) is set as a tensioning area (152). The guiding strips (22) of one of the cloth layers (15) are set as first guiding strips (221), and the guiding strips (22) of the other cloth layer (15) are set as second guiding strips (222). The distance between two first guiding strips (221) in the same group is less than the distance between two second guiding strips (222) in the same group. The length direction of the W - shaped strip (21) is the length direction of the cloth layer (15). The cross - section of the W - shaped strip (21) is W - shaped. The W - shaped strip (21) includes an inverted V - shaped plate (211) and two inclined plates (212). The two inclined plates (212) are respectively fixed to both sides of the inverted V - shaped plate (211). The inclined surfaces of the two inclined plates (212) respectively fit the inclined surfaces of the two second guiding strips (222) in the same group. The two inclined surfaces of the inverted V - shaped plate (211) respectively fit the inclined surfaces of the two first guiding strips (221) in the same group.

4. The seawater channel fabric structure with segmented weaving density according to claim 1 is characterized in that: The flow channel cloth (1) is divided into two cloth layers (15) along its thickness direction, and both cloth layers (15) have the filtering area (12) and the glue line area (13); a cloth surface tightening structure is arranged between the two cloth layers (15), and the cloth surface tightening structure comprises a plurality of groups of first fish silk threads (23), a plurality of second fish silk threads (25) corresponding to each group of first fish silk threads (23) and a rack piece (26); the length direction of the first fish silk threads (23) is the length direction of the cloth layer (15); each group of first fish silk threads (23) is arranged at intervals along the width direction of the cloth layer (15); a group of first fish silk threads (23) comprises two first fish silk threads (23); the first fish silk threads (23) are sewn to the cloth layer (15); the area of ​​the cloth layer (15) between the two first fish silk threads (23) of the same group is set as the contraction area (153); the area of ​​the cloth layer (15) between two adjacent groups of first fish silk threads (23) is set as the contraction area (153); The area between the first and second fishing threads (23) is set as a tightening area (152), the part where the first fishing thread (23) is exposed on the cloth layer (15) is set as a connecting part (231), and the connecting parts (231) of the two first fishing threads (23) in the same group are staggered along the length direction of the first fishing thread (23); the second fishing thread (25) passes around each connecting part (231) in sequence; the number of the rack pieces (26) is two, the length direction of the rack pieces (26) is the length direction of the cloth layer (15), the two rack pieces (26) are constrained in the space surrounded by the second fishing thread (25), the contraction area (153) and the two first fishing threads (23) in the same group, the opposite sides of the two rack pieces (26) are provided with saw teeth, the saw teeth of the two rack pieces (26) are engaged with each other, and the two ends of the second fishing thread (25) are respectively fixedly connected with the separated ends of the two rack pieces (26).

5. The seawater channel fabric structure with segmented weaving density according to claim 1 is characterized in that: Nano calcium carbonate powder is spread on both sides of the glue line area (13).

6. A reverse osmosis membrane element, characterized in that: It comprises a central tube (10) and a membrane unit, wherein the central tube (10) has a plurality of water inlet holes, the membrane unit is wound around the central tube (10), the membrane unit comprises a diaphragm (101), a water inlet mesh (102) and a seawater channel cloth structure with segmented weaving density as claimed in claim 1, and the connecting edge (11) of the channel cloth (1) is fixed to the central tube (10).

7. The reverse osmosis membrane element according to claim 6, characterized in that: It also includes two tensioning structures, the axial length of the flow channel cloth (1) is greater than the axial length of the diaphragm (101) and the water inlet mesh cloth (102); the tensioning structure includes an inner ring sleeve (53), a spring (52) and a plurality of steel sheets (51), both sides of the flow channel cloth (1) in the length direction are sewn with cloth sleeves (16), the two inner ring sleeves (53) are respectively slidably sleeved on the two ends of the central tube (10), the steel sheet (51) passes through the cloth sleeve (16), one end of the steel sheet (51) is radially inserted into the inner ring sleeve (53), and the elastic force of the spring (52) is used to force the inner ring sleeve (53) to slide axially away from the middle of the central tube (10); the rubber line area (13) includes The invention comprises two first adhesive sections (131) and a second adhesive section (132), wherein the first adhesive section (131) extends along the width direction of the runner cloth (1), and the second adhesive section (132) extends along the length direction of the runner cloth (1); both surfaces of the first adhesive section (131) are covered with a first release film (31), and both ends of the first release film (31) have tear tongues (311), and the tear tongues (311) extend to the outside of the runner cloth (1); both surfaces of the second adhesive section (132) are covered with the first release film (31), and one end of the second release film (32) has a draw tape (321), and the draw tape (321) extends to the outside of the runner cloth (1).

8. The reverse osmosis membrane element according to claim 7, characterized in that: The surface of the first release film (31) is provided with a plurality of easy-tear lines (312), the easy-tear lines (312) extending along the length direction of the runner cloth (1), and the easy-tear lines (312) are staggered along the width direction of the runner cloth (1).

Images