A skirt-free end cover structure and reverse osmosis membrane element

Abstract

The present application relates to a skirtless end cap structure and a reverse osmosis membrane element, and relates to the field of reverse osmosis membrane, which includes an end cap, which includes an intermediate ring sleeve, an outer ring sleeve and a plurality of ribs, the intermediate ring sleeve is coaxially arranged with the outer ring sleeve, the ribs are radially extended along the intermediate ring sleeve, each rib is evenly arranged around the circumference of the intermediate ring sleeve, and the two ends of the ribs are respectively fixedly connected to the outer peripheral surface of the intermediate ring sleeve and the inner peripheral surface of the outer ring sleeve; the outer peripheral surface of the outer ring sleeve is provided with at least three axially spaced interlocking grooves, and the axial distance between the surface of the ribs and one end face of the outer ring sleeve is 1-3mm. The present application can reduce the constraints on large-diameter membrane units and reduce the occurrence of glass fiber embedding due to excessive gaps.

Description

Technical Field

[0001] The present application relates to the field of reverse osmosis membranes, and in particular to a skirt-free end cover structure and a reverse osmosis membrane element. Background Art

[0002] Reverse osmosis membrane elements are particularly outstanding in their performance in filtering water. They use the property that high-concentration water will flow to low-concentration water, allowing the nanoscale pores of the membrane to directly separate water molecules.

[0003] The existing reverse osmosis membrane element includes a central tube, a membrane unit, a fiberglass shell and two end covers. The central tube has multiple water inlet holes. The membrane unit is wound around the central tube. The end cover has an annular skirt. The end cover is sleeved on the end of the central tube. The end face of the end cover abuts against the end face of the membrane unit, and the skirt is sleeved on the outside of the end of the membrane unit to cover the gap between the uneven end face of the membrane unit and the end face of the end cover. Then, glass fibers are wound around the membrane unit and the outer peripheral surface of the end cover to form a fiberglass shell.

[0004] However, the setting of the skirt will restrict the maximum diameter of the membrane unit, and when the membrane unit diameter is small, it will affect the filtering effect. If the skirt is removed, the gap between the uneven end face of the membrane unit and the end face of the end cover will be exposed. When the glass fiber is wound, the glass fiber will be embedded in the gap. The embedded glass fiber will block the water flow through the end face of the membrane unit, affecting the performance in later use. Summary of the invention

[0005] In order to reduce the constraints on large-diameter membrane units and reduce the embedding of glass fibers, the present application provides a skirt-free end cover structure and a reverse osmosis membrane element.

[0006] The present application provides a skirt-free end cover structure, which adopts the following technical solution:

[0007] A skirtless end cover structure comprises an end cover, wherein the end cover comprises an intermediate ring sleeve, an outer ring sleeve and a plurality of ribs, wherein the intermediate ring sleeve is coaxially arranged with the outer ring sleeve, the ribs are radially extended along the intermediate ring sleeve, the ribs are evenly arranged around the circumference of the intermediate ring sleeve, and the two ends of the ribs are respectively fixedly connected to the outer circumferential surface of the intermediate ring sleeve and the inner circumferential surface of the outer ring sleeve; the outer circumferential surface of the outer ring sleeve is provided with at least three axially spaced engaging grooves, and the axial distance between the surface of the ribs and one end face of the outer ring sleeve is 1-3 mm.

[0008] By adopting the above technical solution, by setting a gap between the rib surface and the end face of the outer ring sleeve and setting at least three engaging grooves, the gap can allow the uneven part of the end of the membrane unit to penetrate as deep as possible into the outer ring sleeve, so that the gap between the exposed part of the end of the membrane unit and the end face of the outer ring sleeve is greatly reduced or there is no gap, thereby reducing the occurrence of glass fibers embedded in the gap. In addition, the setting of multiple engaging grooves can greatly increase the winding strength between the glass fibers and the outer ring sleeve, thereby improving the installation stability.

[0009] Optionally, an inner edge of one end surface of the outer ring sleeve is provided with a chamfer, and the angle of the chamfer is 40°-50°.

[0010] Optionally, it also includes a first fishing line, and the end covers are set to two, and the adjacent end faces of the outer ring sleeves of the two end covers are provided with multiple first perforations, and the first perforations are evenly arranged along the circumference of the outer ring sleeve, and the first perforations of the two outer ring sleeves are staggered along the circumference, and a first rod body is arranged in the first perforation; the first fishing line passes through the first perforations of the two outer ring sleeves in turn and bypasses the first rod body, and the first fishing line is arranged in a wavy form along the circumference of the outer ring sleeve to form a barrier layer, and the end cover is provided with a first fixing member, and the first fixing member is used to fix the end of the first fishing line to the bottom of the groove of the engaging groove.

[0011] By adopting the above technical solution, a barrier layer formed by a first fish wire is provided to connect the two end covers to improve the installation strength of the end covers, and the barrier layer acts as a flexible skirt, which can not only reduce the constraints on large-diameter membrane units, but also reduce the occurrence of gaps between membrane units and end covers during glass fiber winding. Secondly, the overall force on the barrier layer is relatively uniform, which can improve the stability of glass fiber winding and the installation strength of the fiberglass shell.

[0012] Optionally, the first fixing member includes a first screw, a threaded hole is provided at the bottom of the engaging groove, the threaded hole has a countersunk hole, both ends of the first fishing wire are wrapped and fixed on the end of the first screw, the first screw cooperates with the threaded hole, the end of the first screw is located in the countersunk hole, and a fixing colloid is solidified in the countersunk hole.

[0013] By adopting the above technical solution, when fixing, first wrap the end of the first fishing line around the end of the first screw, and then tighten the first screw to fix the first screw to the bottom of the fitting groove. During the tightening process, the first fishing line is further tightened to force the two ends to be close to each other to improve the installation strength of the end cover. After tightening, fill the countersunk hole with adhesive to solidify to form a fixed colloid to further fix the first fishing line. Finally, wrap the glass wire to further lock the first fishing line, thereby greatly improving the installation strength of the first fishing line.

[0014] Optionally, the number of the first fixing members is two, and the two first fixing members respectively fix the two ends of the first fishing line to the bottom of the engaging groove, the first fixing member includes a second screw, and the second screw is divided into two halves along its own radial surface, and a threaded hole is provided at the bottom of the engaging groove, the second screw cooperates with the threaded hole, and the two halves jointly clamp the ends of the first fishing line, and the ends of the first fishing line are wound around the second screw.

[0015] By adopting the above technical solution, when fixing, first put the end of the first fishing line between the two halves, the halves clamp the first fishing line to form a complete second screw, and then screw the second screw into the threaded hole to fix the first fishing line.

[0016] The present application provides a reverse osmosis membrane element, which adopts the following technical solution:

[0017] A reverse osmosis membrane element comprises a central tube, a membrane unit, a glass fiber reinforced plastic shell and a skirtless end cover structure, wherein the central tube has a plurality of water inlet holes, the membrane unit is wound around the central tube, the middle ring sleeve of the end cover is sleeved on the central tube, the surface of the rib plate abuts against the end of the membrane unit, and the glass fiber reinforced plastic shell is formed by glass fibers being wound around the membrane unit and the outer ring sleeve.

[0018] Optionally, it also includes a first fishing line and a second fishing line, and the adjacent end surfaces of the outer ring sleeves of the two end covers are provided with a plurality of first perforations, each of the first perforations is evenly arranged along the circumference of the outer ring sleeve, and the first perforations of the two outer ring sleeves are staggered along the circumference, and a first rod body is arranged in the first perforation; the first fishing line passes through the first perforations of the two outer ring sleeves in sequence and bypasses the first rod body, and the first fishing line is arranged in a wavy form along the circumference of the outer ring sleeve to form a barrier layer, and the end cover is provided with a first fixing part, and the first fixing part is used to fix the end of the first fishing line to the bottom of the groove of the fitting groove; the outer peripheral surface of the outer ring sleeve is protrudingly structured with an outer ring body, and the adjacent end surfaces of the outer ring bodies of the two end covers are provided with a plurality of second perforations, each of the second perforations The holes are evenly arranged along the circumference of the outer ring body, and the second through-holes of the two end covers are staggered along the circumference, and a second rod body is arranged in the second through-hole; the second fish wire thread passes through the second through-holes of the two end covers in turn and bypasses the second rod body, and the second fish wire thread is arranged in a wavy form along the circumference of the outer ring sleeve for one circle, and the end cover is provided with a second fixing piece, and the second fixing piece is used to fix the end of the second fish wire thread on the outer ring body; the fiberglass shell includes a protective layer and a reinforcement layer in sequence from the inside to the outside along its own radial direction, the glass fibers of the protective layer are wound around the outer circumferential surface of the barrier layer, and the glass fibers of the reinforcement layer are bypassed in sequence along the circumferential direction of the membrane unit each wavy section of the second fish wire thread, and the glass fibers of the reinforcement layer are woven and combined with the second fish wire thread.

[0019] By adopting the above technical scheme, by setting the barrier layer formed by the first fish wire, which cooperates with the protective layer, not only can the constraints on the large diameter membrane unit be reduced, but also the stability of the glass fiber winding and the installation strength of the protective layer can be improved; by setting the second fish wire, it is combined with the glass fiber weaving of the reinforcement layer to form a denser mesh interlaced structure, thereby greatly improving the structural strength, hardness and deformation resistance of the outermost reinforcement layer of the FRP shell, and further improving the connection strength between the FRP shell and the end cover.

[0020] Optionally, it also includes multiple third fish wires and multiple fourth fish wires, the outer circumference of the outer ring sleeve is threadedly connected to a fixing sleeve, and the outer circumference of the fixing sleeve is fixed to the inner circumference of the glass fiber reinforced plastic shell; the two ends of the third fish wire are respectively fixedly connected to the fixing sleeves of the two end covers, and the third fish wire is in a spiral shape with the center tube as the axis, and each spiral third fish wire forms a drag reduction layer, and the inner circumference of the glass fiber reinforced plastic shell is attached to the outer circumference of the drag reduction layer; the two ends of the center tube are respectively provided with a first limiting sleeve and a second limiting sleeve, the first limiting sleeve is fixed with multiple first support rods evenly arranged around the circumference, and the second limiting sleeve is fixed with multiple first support rods evenly arranged around the circumference. There are multiple second support rods evenly arranged around the circumference, the first support rod and the second support rod are both extended radially along the central tube, the lengths of the first support rod and the second support rod are less than or equal to the diameter of the membrane unit, the two ends of the fourth fish wire are respectively detachably connected to the ends of the first support rod and the second support rod, and the first support rod and the second support rod at both ends of the fourth fish wire are circumferentially staggered, so that the fourth fish wire is in a spiral shape with the central tube as the axis, the spiral direction of the fourth fish wire is opposite to the spiral direction of the third fish wire, and the spiral fourth fish wires form a limiting layer, and the inner circumferential surface of the limiting layer fits the outer circumferential surface of the membrane unit.

[0021] By adopting the above technical solution, when the membrane unit needs to be disassembled and cleaned, one of the end covers is loosened, and the end cover is detached from the first limiting sleeve and the center tube, leaving only the fixing sleeve fixedly connected to the FRP shell, and then the center tube and the membrane unit are driven to move axially out of the FRP shell. At this time, since the limiting layer, the first support rod, the second support rod, the first limiting sleeve and the second limiting sleeve jointly enclose the membrane unit, the friction between the membrane unit and the drag reduction layer and the FRP shell can be greatly reduced, so that the membrane unit and the center tube can be pulled out of the FRP shell. In addition, the limiting layer, the first support rod, the second support rod, the first limiting sleeve and the second limiting sleeve can also protect the integrity of the membrane unit and reduce friction or collision damage to the membrane unit. Finally, the fourth fishing line is removed, and the membrane unit is cleaned to restore the filtering effect of the membrane unit.

[0022] Optionally, the first limiting sleeve is threadably connected to the center tube, a rubber thread is fixed to the inner circumference of the second limiting sleeve, the inner diameter of the rubber thread abuts against the outer circumference of the center tube, and the rotation direction of the rubber thread is the same as that of the fourth fishing line; when the first limiting sleeve is not engaged with the center tube thread, the fourth fishing line is spiral; as the first limiting sleeve is gradually tightened, the pitch of the fourth fishing line gradually decreases; as the first limiting sleeve moves axially away from the middle of the center tube, the pitch of the fourth fishing line gradually increases, and the first limiting sleeve damps the rotation relative to the center tube.

[0023] By adopting the above technical solution, during installation, the first limiting sleeve and the second limiting sleeve are slidably sleeved on the two ends of the center tube, and then the two ends of the fourth fish wire are fixedly connected to the ends of the first support rod and the second support rod respectively, and then, the center tube is kept fixed, and the first limiting sleeve is idle, so that the first support rod and the second support rod are circumferentially misaligned, so that the fourth fish wire is spiral, and then the first limiting sleeve is matched with the center tube thread, and the first limiting sleeve is continuously tightened, the spiral degree of the fourth fish wire is increased, the pitch of the fourth fish wire is gradually reduced, and the fourth fish wire is more evenly wound around the outer peripheral surface of the membrane unit component. At the same time, the first limiting sleeve and the first support rod are closer to the end face of the membrane unit component until they are abutted against each other, thereby completing the installation.

[0024] When the membrane unit needs to be disassembled and cleaned, one of the end covers is loosened, the end cover is separated from the first limiting sleeve and the center tube, and only the fixing sleeve is fixedly connected to the glass fiber reinforced plastic shell, and then the first limiting sleeve is pulled axially, and the action of the first limiting sleeve is transmitted to the membrane unit and the center tube through the first support rod, the fourth fishing line, the second support rod and the second limiting sleeve, so as to drive the membrane unit and the center axially to gradually move out of the glass fiber reinforced plastic shell. In this process, the pulling force of the first limiting sleeve and the damping rotation of the second limiting sleeve are used to make the membrane unit, the center tube and the fourth fishing line move out of the glass fiber reinforced plastic shell. The silk thread rotates slowly, and the fourth fish thread is gradually released (the pitch of the fourth fish thread gradually increases), the fourth fish thread moves circumferentially and axially relative to the third fish thread, and the relative movement path of the fourth fish thread and the third fish thread increases. The moving fourth fish thread will force the third fish thread to make adaptive elastic deformation to avoid it. It can be understood that the inner diameter elasticity of the drag reduction layer formed by the third fish thread increases to further reduce the friction resistance of the third fish thread to the limiting layer and the membrane unit, so as to improve the convenience of extraction and protect the structure of the membrane unit.

[0025] Optionally, the surface of the second fishing line is set to be a rough surface.

[0026] By adopting the above technical solution, the stability of the grouping combination can be improved.

[0027] In summary, the present application includes at least one of the following beneficial technical effects:

[0028] By setting a gap between the rib surface and the end face of the outer ring sleeve and setting at least three engaging grooves, the gap can allow the uneven part of the end of the membrane unit to penetrate as deep as possible into the outer ring sleeve, so that the gap between the exposed part of the end of the membrane unit and the end face of the outer ring sleeve is greatly reduced, thereby reducing the occurrence of glass fibers embedded in the gap, and the setting of multiple engaging grooves can greatly increase the winding strength between the glass fibers and the outer ring sleeve, and improve the installation stability;

[0029] By setting a barrier layer formed by the first fish wire to connect the two end caps, the installation strength of the end caps is improved. In addition, the barrier layer plays the role of a flexible skirt, which can not only reduce the constraints on the large-diameter membrane unit, but also reduce the occurrence of the gap between the membrane unit and the end cap during the glass fiber winding process. Secondly, the overall force of the barrier layer is relatively uniform, which can improve the stability of the glass fiber winding and the installation strength of the glass fiber reinforced plastic shell.

[0030] By arranging the second fish wire, it is woven and combined with the glass wire of the reinforcement layer to form a dense mesh interlaced structure, thereby greatly improving the structural strength, hardness and deformation resistance of the outermost reinforcement layer of the FRP shell, and further improving the connection strength between the FRP shell and the end cover;

[0031] By setting a limiting layer, a first support rod, a second support rod, a first limiting sleeve and a second limiting sleeve, the membrane unit is enclosed and the friction between the membrane unit and the drag reduction layer and the glass fiber reinforced plastic shell is reduced, so that the membrane unit and the center tube can be pulled out from the glass fiber reinforced plastic shell, so as to clean the membrane unit and restore the filtering effect of the membrane unit; and, by utilizing the retracting pulling force of the first limiting sleeve and the damping rotation of the second limiting sleeve, the membrane unit, the center tube and the fourth fish thread are rotated slowly, the fourth fish thread is gradually released, the relative movement path of the fourth fish thread and the third fish thread increases, and the fourth fish thread forces the third fish thread to make an adaptive elastic deformation to avoid, so as to further reduce the friction resistance of the third fish thread to the limiting layer and the membrane unit, so as to improve the convenience of extraction and protect the structure of the membrane unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 Schematic diagram of the skirt-free end cover structure of Example 1.

[0033] Figure 2 It is a cross-sectional view of the skirt-free end cover structure of Example 1.

[0034] Figure 3 This is a cross-sectional view of the reverse osmosis membrane element of Example 1.

[0035] Figure 4 yes Figure 3 A partial enlarged view of point A in the middle.

[0036] Figure 5 It is a schematic diagram of Example 2 for showing the positional relationship between the end cap and the first fishing line.

[0037] Figure 6 It is a partial schematic diagram of Example 2 for demonstrating the matching relationship between the first fishing line and the first rod body.

[0038] Figure 7 It is a partial cross-section of Example 2 for demonstrating the fixed relationship between the first fishing line and the wall of the engaging groove.

[0039] Figure 8 It is a partial cross-section of Example 3 for demonstrating the fixed relationship between the first fishing line and the wall of the engaging groove.

[0040] Fig. 9 This is a cross-sectional view of the reverse osmosis membrane element of Example 4.

[0041] Fig.10 yes Fig. 9 A partial enlarged view of point B in the middle.

[0042] Fig.11 It is a partial schematic diagram of Example 4 for showing the woven combination of the second fish wire and the glass wire.

[0043] Fig.12 It is a schematic diagram of Example 5 for showing the spiral state of the fourth fishing line.

[0044] Fig.13 It is a cross-sectional view of the second limiting sleeve of Example 5.

[0045] Fig.14 yes Fig.12 A partial enlarged view of point C in the middle.

[0046] Fig.15 This is a cross-sectional view of the reverse osmosis membrane element of Example 5.

[0047] Fig.16 yes Fig.15 A partial enlarged view of point D in the middle.

[0048] Fig.17 It is a schematic diagram of Example 5 for showing the positional relationship between the fixing sleeve and the third fishing line.

[0049] Fig.18 yes Fig.17 A partial enlarged view of point E in the middle.

[0050] Description of reference numerals: 1, end cap; 2, first fish wire; 3, second fish wire; 4, fourth fish wire; 5, third fish wire; 6, fixing sleeve; 10, membrane unit; 101, center tube; 102, glass fiber reinforced plastic shell; 1021, glass fiber; 1022, protective layer; 1023, reinforcement layer; 11, intermediate ring sleeve; 12, outer ring sleeve; 121, chamfer; 122, fitting groove; 123, outer ring body; 124, first through hole; 125, first rod body; 1 26. Avoidance groove; 13. Rib; 21. First screw; 22. Threaded hole; 23. Fixing colloid; 24. Second screw; 241. Half body; 31. Second through hole; 32. Second rod body; 40. Limiting layer; 41. First limiting sleeve; 42. Second limiting sleeve; 421. Rubber thread; 43. First support rod; 431. First strip groove; 432. First clamping groove; 44. Second support rod; 50. Drag reduction layer; 61. Second strip groove; 62. Second clamping groove. DETAILED DESCRIPTION

[0051] The following is combined with Figure 1 -Attached Fig.18 This application is described in further detail.

[0052] Example 1, Example 1 discloses a skirt-free end cap structure, such as Figure 1 and Figure 2 As shown, the skirtless end cover structure includes an end cover 1, which includes an intermediate ring sleeve 11, an outer ring sleeve 12 and a plurality of ribs 13. The intermediate ring sleeve 11 is coaxially arranged with the outer ring sleeve 12, and the ribs 13 are radially extended along the intermediate ring sleeve 11. The ribs 13 are evenly arranged around the circumference of the intermediate ring sleeve 11, and the two ends of the ribs 13 are integrally connected with the outer circumferential surface of the intermediate ring sleeve 11 and the inner circumferential surface of the outer ring sleeve 12 respectively.

[0053] The outer circumferential surface of the outer ring sleeve 12 is protruded with an outer ring body 123. The outer circumferential surface of the outer ring sleeve 12 is provided with at least three axially spaced interlocking grooves 122. The interlocking grooves 122 are annular. In this embodiment, there are three interlocking grooves 122.

[0054] The axial distance between the surface of the rib plate 13 and one end surface of the outer ring sleeve 12 is 1-3 mm, and the inner edge of one end surface of the outer ring sleeve 12 is provided with a chamfer 121, and the angle of the chamfer 121 is 40°-50°.

[0055] By setting a gap between the surface of the rib 13 and the end face of the outer ring sleeve 12, the gap can allow the uneven part of the end of the membrane unit 10 to penetrate as deep as possible into the outer ring sleeve 12, so that the gap between the exposed part of the end of the membrane unit 10 and the end face of the outer ring sleeve 12 is greatly reduced or there is no gap, thereby reducing the occurrence of glass fibers 1021 embedded in the gap.

[0056] Furthermore, the provision of multiple engaging grooves 122 can greatly increase the winding strength between the glass filament 1021 and the outer ring sleeve 12, thereby improving the installation stability.

[0057] Example 1 also discloses a reverse osmosis membrane element. Figure 3 , Figure 4 As shown, the reverse osmosis membrane element includes a central tube 101, a membrane unit 10, a fiberglass shell 102 and the above-mentioned skirtless end cover structure, wherein two end covers 1 are provided, the central tube 101 has a plurality of water inlet holes, the membrane unit 10 is wound around the central tube 101, the middle ring sleeve 11 of the end cover 1 is sleeved on the central tube 101, the two end covers 1 are symmetrically arranged, the surface of the rib plate 13 abuts against the end of the membrane unit 10, and a gap is set between the surface of the rib plate 13 and the end face of the outer ring sleeve 12, so that the uneven part of the end of the membrane unit 10 is as deep as possible into the outer ring sleeve 12, so that the gap between the exposed part of the end of the membrane unit 10 and the end face of the outer ring sleeve 12 is greatly reduced or there is no gap.

[0058] The FRP shell 102 is formed by glass fibers 1021 wound around the membrane unit 10 and the outer ring sleeve 12 , that is, the glass fibers 1021 are simultaneously wound around the membrane unit 10 and the outer ring sleeve 12 in the fitting grooves 122 , and the end face of the FRP shell 102 abuts against the end face of the outer ring body 123 .

[0059] Embodiment 2, embodiment 2 is different from embodiment 1 in that, Figure 5 , Figure 6 , Figure 7 As shown, the skirtless end cover structure also includes a first fishing wire 2, which is a single fishing wire. The adjacent end surfaces of the outer ring sleeves 12 of the two end covers 1 are provided with a plurality of first through holes 124, that is, the first through holes 124 penetrate into the engaging groove 122, and the first through holes 124 are evenly arranged along the circumference of the outer ring sleeve 12, and the first through holes 124 of the two outer ring sleeves 12 are staggered along the circumference, and the first rod body 125 is fixed in the first through holes 124.

[0060] The first fishing line 2 passes through the first through holes 124 of the two outer ring sleeves 12 in sequence and passes around the first rod 125, so that the first fishing line 2 is arranged in a wavy shape along the circumference of the outer ring sleeve 12 to form a barrier layer.

[0061] The end cover 1 is provided with a first fixing member, which is used to fix the end of the first fishing line 2 to the bottom of the fitting groove 122. Specifically, the first fixing member includes a first screw 21, and the bottom of the fitting groove 122 is provided with a threaded hole 22, the threaded hole 22 has a countersunk hole, and the groove wall of the fitting groove 122 is provided with an avoidance groove 126.

[0062] When installing the first fishing line 2, firstly, both end caps 1 are sleeved on both ends of the central tube 101, and then the first fishing line 2 is passed through so that the first fishing line 2 is arranged in a wavy form along the circumference of the outer ring sleeve 12 to form a barrier layer, and then the two ends of the first fishing line 2 are passed through the avoidance groove 126 to enter the fitting groove 122, and the two ends of the first fishing line 2 are wrapped and fixed on the end of the first screw 21, and then tied and knotted, the excess part of the first fishing line 2 is cut off, and then the first screw 21 is screwed into the threaded hole 22. At this time, the end of the first screw 21 is located in the countersunk hole, and then adhesive is injected into the countersunk hole, which solidifies to form a fixed colloid 23 to further fix the first fishing line 2, and finally the glass fiber 1021 is wrapped to form a glass fiber reinforced plastic shell 102 to further lock the first fishing line 2, thereby greatly improving the installation strength of the first fishing line 2.

[0063] The implementation principle of Example 2 is: by setting a barrier layer formed by a first fishing line 2 to connect the two end covers 1, the installation strength of the end covers 1 can be improved, and the barrier layer plays the role of a flexible skirt, which can not only reduce the constraints on the large diameter membrane unit 10, but also reduce the occurrence of glass fibers 1021 being embedded in the gap between the membrane unit 10 and the end cover 1 during the winding process. Secondly, the overall force on the barrier layer is relatively uniform, which can improve the winding stability of the glass fibers 1021 and the installation strength of the fiberglass shell 102.

[0064] Embodiment 3, embodiment 3 is different from embodiment 2 in that, Figure 8 As shown, there are two first fixing members, and the two first fixing members respectively fix the two ends of the first fishing line 2 on the bottom of the fitting groove 122, and the two ends of the first fishing line 2 are fixed at similar positions.

[0065] In this embodiment, the first fixing member is a second screw 24 , and the second screw 24 is divided into two halves 241 along its radial surface.

[0066] When installing the first fishing line 2, firstly sleeve the two end covers 1 on both ends of the central tube 101, then pass one end of the first fishing line 2 through the avoidance groove 126 to enter the fitting groove 122, and place the end between the two halves 241. The halves 241 clamp the first fishing line 2 to form a complete second screw 24, and then screw the second screw 24 into the threaded hole 22 to fix the first fishing line 2, and then thread the first fishing line 2 so that the first fishing line 2 is arranged in a wavy shape along the circumference of the outer ring sleeve 12 to form a barrier layer, and finally fix the other end of the first fishing line 2 with another first fixing member.

[0067] Embodiment 4, embodiment 4 is different from embodiment 2 in that, Fig. 9 , Fig.10 , Fig.11As shown, the reverse osmosis membrane element also includes a second fish wire 3, which is set as one, and the surface of the second fish wire 3 is set as a rough surface. The adjacent end faces of the outer ring body 123 of the two end covers 1 are provided with a plurality of second through holes 31, and each second through hole 31 is evenly arranged along the circumference of the outer ring body 123, and the second through holes 31 of the two end covers 1 are staggered along the circumference, and a second rod body 32 is provided in the second through hole 31.

[0068] The second fishing line 3 passes through the second through holes 31 of the two end covers 1 in sequence and passes around the second rod body 32. The second fishing line 3 is arranged in a wavy form along the circumference of the outer ring sleeve 12. The end cover 1 is provided with a second fixing member. The second fixing member is used to fix the end of the second fishing line 3 on the outer ring body 123. The specific structure of the second fixing member is consistent with the first fixing member and is not repeated here. In addition, since the fixed position of the second fishing line 3 is the outer ring body 123, and the fixed position of the first fishing line 2 is the bottom of the fitting groove 122, the diameter enclosed by the second fishing line 3 is greater than the diameter enclosed by the first fishing line 2.

[0069] The fiberglass shell 102 includes a protective layer 1022 and a reinforcement layer 1023 in sequence from the inside to the outside along its own radial direction. Specifically, after the first fish wire 2 is installed, the glass wire 1021 is wound around the outside of the barrier layer, and this part is the protective layer 1022. At the same time, the protective layer 1022 is also wound around and covers the engaging groove 122. Then the winding of the glass wire 1021 is paused, and the second fish wire 3 is installed. After the second fish wire 3 is installed, the reinforcement layer 1023 is wound again. Specifically, the glass wire 1021 of the reinforcement layer 1023 successively bypasses the various wavy sections of the second fish wire 3 along the circumferential direction of the membrane unit 10, so that the glass wire 1021 of the reinforcement layer 1023 is woven and combined with the second fish wire 3.

[0070] In this way, the barrier layer formed by the first fish wire 2 cooperates with the protective layer 1022, which can not only reduce the constraints on the large-diameter membrane unit 10, but also improve the winding stability of the glass wire 1021 and the installation strength of the protective layer 1022. In addition, the second fish wire 3 is woven and combined with the glass wire 1021 of the reinforcement layer 1023 to form a dense mesh interlaced structure, thereby greatly improving the structural strength, hardness and deformation resistance of the outermost reinforcement layer 1023 of the glass fiber reinforced plastic shell 102, and further improving the connection strength between the glass fiber reinforced plastic shell 102 and the end cover 1.

[0071] Embodiment 5, embodiment 5 is different from embodiment 1 in that, Fig.12 , Fig.13As shown, the reverse osmosis membrane element also includes a plurality of fourth fishing lines 4, and the two ends of the central tube 101 are respectively provided with a first limiting sleeve 41 and a second limiting sleeve 42, the first limiting sleeve 41 is fixed with a plurality of first support rods 43 arranged evenly around the circumference, and the second limiting sleeve 42 is fixed with a plurality of second support rods 44 arranged evenly around the circumference, the first support rods 43 and the second support rods 44 are both extended radially along the central tube 101, and the lengths of the first support rods 43 and the second support rods 44 are less than or equal to the diameter of the membrane unit 10.

[0072] The first limiting sleeve 41 is threadedly connected to the central tube 101 . A rubber thread 421 is fixed to the inner circumference of the second limiting sleeve 42 . The inner diameter of the rubber thread 421 abuts against the outer circumference of the central tube 101 .

[0073] like Fig.12 , Fig.13 , Fig.14 As shown, the two ends of the fourth fishing line 4 are detachably connected to the ends of the first support rod 43 and the second support rod 44 respectively. Specifically, the surfaces of the first support rod 43 and the second support rod 44 are provided with a first strip groove 431 extending along their own axis, and the end of the first strip groove 431 is provided with a first clamping groove 432, and the groove width of the first clamping groove 432 is greater than the groove width of the first strip groove 431.

[0074] During installation, the first limiting sleeve 41 and the second limiting sleeve 42 are first slidably sleeved on the two ends of the central tube 101, and then the two ends of the fourth fishing line 4 are fixedly connected to the ends of the first support rod 43 and the second support rod 44 respectively. Specifically, the end of the fourth fishing line 4 passes through the first strip groove 431, and the end of the fourth fishing line 4 is knotted to form a knot, and the knot is inserted into the first slot 432. Then, the central tube 101 and the second limiting sleeve 42 are kept fixed, and the first limiting sleeve 41 is idle, so that the first support rod 43 and the second support rod 44 are circumferentially misaligned, so that the fourth fishing line 4 is The fourth fish thread 4 is in a spiral shape with the center tube 101 as the axis, and the rotation direction of the fourth fish thread 4 is the same as that of the rubber thread 421. Then the first limiting sleeve 41 is threadedly matched with the center tube 101, and the first limiting sleeve 41 is continuously tightened. The spiral degree of the fourth fish thread 4 increases, and the pitch of the fourth fish thread 4 gradually decreases. The fourth fish thread 4 is more evenly wound around the outer peripheral surface of the membrane unit 10. The spiral fourth fish threads 4 form a limiting layer 40. At the same time, the first limiting sleeve 41 and the first support rod 43 are closer to the end face of the membrane unit 10 until they are abutted against each other, thereby completing the installation.

[0075] like Fig.15 , Fig.16 , Fig.17 , Fig.18As shown, the reverse osmosis membrane element also includes a plurality of third fish wires 5, the outer peripheral surface of the outer ring sleeve 12 is threadedly connected with a fixing sleeve 6, and the two ends of the third fish wire 5 are respectively fixedly connected to the fixing sleeves 6 of the two end covers 1. Specifically, a second strip groove 61 is opened on the outer peripheral surface of the fixing sleeve 6, and the second strip groove 61 extends axially along the fixing sleeve 6. A second clamping groove 62 is provided at the end of the second strip groove 61. The end of the third fish wire 5 passes through the second strip groove 61, and the end of the third fish wire 5 is knotted to form a knot, and the knot is clamped in the second clamping groove 62.

[0076] After installing the membrane unit 10 and the fourth fish wire 4, the two end covers 1 are respectively put on the two ends of the central tube 101, and then the two ends of the third fish wire 5 are respectively fixed on the outer circumference of the fixed sleeve 6 of the two end covers 1, and then one of the end covers 1 is rotated to make the third fish wire 5 spiral with the central tube 101 as the axis, and each spiral third fish wire 5 forms a drag reduction layer 50, the spiral direction of the third fish wire 5 is opposite to the spiral direction of the fourth fish wire 4, and the diameter of the drag reduction layer 50 is larger than the diameter of the limiting layer 40, and finally the glass fiber 1021 is wound, and the glass fiber 1021 is wound around the outer circumference of the drag reduction layer 50 and the outer circumference of the fixed sleeve 6, that is, the outer circumference of the fixed sleeve 6 is fixed to the inner circumference of the glass fiber reinforced plastic shell 102, and the inner circumference of the glass fiber reinforced plastic shell 102 is attached to the outer circumference of the drag reduction layer 50.

[0077] When the membrane unit 10 needs to be disassembled and cleaned, one of the end covers 1 is loosened, and the end cover 1 is separated from the first limiting sleeve 41 and the center tube 101, leaving only the fixing sleeve 6 fixedly connected to the glass fiber reinforced plastic shell 102, and then the first limiting sleeve 41 is pulled axially, and the force of the first limiting sleeve 41 is transmitted to the membrane unit 10 and the center tube 101 through the first support rod 43, the fourth fishing wire 4, the second support rod 44 and the second limiting sleeve 42, so as to drive the membrane unit 10 and the center axially to gradually move out of the glass fiber reinforced plastic shell 102. In this process, the pulling force of the first limiting sleeve 41 and the damping rotation of the second limiting sleeve 42 are used to make the membrane unit 10 10. The center tube 101 and the fourth fish thread 4 rotate slowly, the fourth fish thread 4 is gradually released (the pitch of the fourth fish thread 4 gradually increases), the fourth fish thread 4 moves circumferentially and axially relative to the third fish thread 5, and the relative movement path of the fourth fish thread 4 and the third fish thread 5 increases. The moving fourth fish thread 4 will force the third fish thread 5 to make adaptive elastic deformation to avoid it, which can be understood as the increase in the inner diameter of the drag reduction layer 50 formed by the third fish thread 5, so as to further reduce the friction resistance of the third fish thread 5 to the limiting layer 40 and the membrane unit 10, so as to improve the convenience of extraction and protect the structure of the membrane unit 10.

[0078] Moreover, during the process of withdrawing the membrane unit 10, since the limiting layer 40, the first support rod 43, the second support rod 44, the first limiting sleeve 41 and the second limiting sleeve 42 jointly enclose the membrane unit 10, the friction between the membrane unit 10 and the drag reduction layer 50 and the fiberglass shell 102 can be greatly reduced, so that the membrane unit 10 and the central tube 101 can be withdrawn from the fiberglass shell 102, and the integrity of the membrane unit 10 can be protected, and the friction or collision damage of the membrane unit 10 can be reduced. Finally, the fourth fishing line 4 is removed, and the membrane unit 10 is cleaned to restore the filtering effect of the membrane unit 10.

[0079] 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 skirt-free end cap structure, characterized in that: The invention comprises an end cover (1) and a first fishing line (2), wherein the end cover (1) comprises an intermediate ring sleeve (11), an outer ring sleeve (12) and a plurality of ribs (13), wherein the intermediate ring sleeve (11) and the outer ring sleeve (12) are coaxially arranged, and the ribs (13) are radially extending along the intermediate ring sleeve (11), and each rib (13) is evenly arranged around the circumference of the intermediate ring sleeve (11), and the two ends of the ribs (13) are respectively fixedly connected to the outer circumference of the intermediate ring sleeve (11) and the inner circumference of the outer ring sleeve (12); the outer circumference of the outer ring sleeve (12) is provided with at least three axially spaced interlocking grooves (122), and the axial distance between the surface of the ribs (13) and one end face of the outer ring sleeve (12) is 1-3 mm; the end cover (1) is provided with two, and the two ends are fixedly connected to the outer circumference of the intermediate ring sleeve (11) and the inner circumference of the outer ring sleeve (12). The adjacent end faces of the outer ring sleeve (12) of the cover (1) are each provided with a plurality of first through holes (124), each of the first through holes (124) is evenly arranged along the circumference of the outer ring sleeve (12), and the first through holes (124) of the two outer ring sleeves (12) are staggered along the circumference, and a first rod body (125) is arranged in the first through hole (124); the first fish thread (2) passes through each of the first through holes (124) of the two outer ring sleeves (12) in sequence and bypasses the first rod body (125), and the first fish thread (2) is arranged in a wavy shape along the circumference of the outer ring sleeve (12) to form a barrier layer, and the end cover (1) is provided with a first fixing member, and the first fixing member is used to fix the end of the first fish thread (2) on the bottom of the groove of the fitting groove (122).

2. The skirt-free end cap structure according to claim 1, characterized in that: The inner edge of one end surface of the outer ring sleeve (12) is provided with a chamfer (121), and the angle of the chamfer (121) is 40°-50°.

3. The skirt-free end cap structure according to claim 1, characterized in that: The first fixing member comprises a first screw (21), a threaded hole (22) is provided at the bottom of the engaging groove (122), the threaded hole (22) has a countersunk hole, both ends of the first fishing wire (2) are wound and fixed on the end of the first screw (21), the first screw (21) cooperates with the threaded hole (22), the end of the first screw (21) is located in the countersunk hole, and a fixing colloid (23) is solidified in the countersunk hole.

4. The skirt-free end cap structure according to claim 1, characterized in that: The first fixing member is provided in two pieces, and the two first fixing members respectively fix the two ends of the first fishing line (2) on the bottom of the fitting groove (122). The first fixing member comprises a second screw (24), and the second screw (24) is divided into two halves (241) along its radial surface. The bottom of the fitting groove (122) is provided with a threaded hole (22), and the second screw (24) cooperates with the threaded hole (22), and the two halves (241) jointly clamp the end of the first fishing line (2), and the end of the first fishing line (2) is wound around the second screw (24).

5. A reverse osmosis membrane element, characterized in that: It comprises a central tube (101), a membrane unit (10), a glass fiber reinforced plastic shell (102) and the skirtless end cover structure as claimed in claim 1, wherein the central tube (101) has a plurality of water inlet holes, the membrane unit (10) is wound around the central tube (101), the middle ring sleeve (11) of the end cover (1) is sleeved on the central tube (101), the surface of the rib plate (13) abuts against the end of the membrane unit (10), and the glass fiber reinforced plastic shell (102) is formed by glass fibers (1021) being wound around the membrane unit (10) and the outer ring sleeve (12).

6. The reverse osmosis membrane element according to claim 5, characterized in that: The invention also comprises a second fish thread (3), wherein the outer peripheral surface of the outer ring sleeve (12) is protrudingly structured with an outer ring body (123), and the adjacent end surfaces of the outer ring bodies (123) of the two end covers (1) are provided with a plurality of second through holes (31), and the second through holes (31) are evenly arranged along the circumference of the outer ring body (123), and the second through holes (31) of the two end covers (1) are staggered along the circumference, and a second rod body (32) is arranged in the second through holes (31); the second fish thread (3) passes through the second through holes (31) of the two end covers (1) in sequence and bypasses the second rod body (32), and the second fish thread (3) is arranged in a circle along the circumference of the outer ring sleeve (12) in a wavy shape. The end cover (1) is provided with a second fixing part, and the second fixing part is used to fix the end of the second fishing wire (3) on the outer ring body (123); the glass fiber reinforced plastic shell (102) includes a protective layer (1022) and a reinforcement layer (1023) in sequence from the inside to the outside along its own radial direction, and the glass fibers (1021) of the protective layer (1022) are wound around the outer peripheral surface of the barrier layer, and the glass fibers (1021) of the reinforcement layer (1023) are sequentially bypassed along the circumferential direction of the membrane unit (10) The wavy sections of the second fishing wire (3), the glass fibers (1021) of the reinforcement layer (1023) are woven and combined with the second fishing wire (3).

7. The reverse osmosis membrane element according to claim 5, characterized in that: The invention also comprises a plurality of third fish wires (5) and a plurality of fourth fish wires (4); the outer peripheral surface of the outer ring sleeve (12) is threadedly connected with a fixing sleeve (6); the outer peripheral surface of the fixing sleeve (6) is fixed to the inner peripheral surface of the glass fiber reinforced plastic shell (102); the two ends of the third fish wire (5) are respectively fixedly connected to the fixing sleeves (6) of the two end covers (1); the third fish wire (5) is in a spiral shape with the central tube (101) as the axis; each of the spiral third fish wires (5) forms a drag reduction layer (50); the inner peripheral surface of the glass fiber reinforced plastic shell (102) is attached to the outer peripheral surface of the drag reduction layer (50); the two ends of the central tube (101) are respectively sleeved with a first limiting sleeve (41) and a second limiting sleeve (42); the first limiting sleeve (41) is fixed with a plurality of first support rods (43) evenly arranged in a circumference; the second limiting sleeve (42) is fixed with a plurality of first support rods (43) evenly arranged in a circumference. The second support rod (44) is evenly arranged on a circumference, the first support rod (43) and the second support rod (44) are both radially extended along the central tube (101), the length of the first support rod (43) and the second support rod (44) is less than or equal to the diameter of the membrane unit (10), the two ends of the fourth fish wire (4) are detachably connected to the ends of the first support rod (43) and the second support rod (44), and the first support rod (43) and the second support rod (44) at the two ends of the fourth fish wire (4) are circumferentially staggered, so that the fourth fish wire (4) is in a spiral shape with the central tube (101) as the axis, the spiral direction of the fourth fish wire (4) is opposite to the spiral direction of the third fish wire (5), and each spiral fourth fish wire (4) forms a limiting layer (40), and the inner circumference of the limiting layer (40) is in contact with the outer circumference of the membrane unit (10).

8. The reverse osmosis membrane element according to claim 7, characterized in that: The first limiting sleeve (41) is threadedly connected to the center tube (101); a rubber thread (421) is fixed to the inner circumference of the second limiting sleeve (42); the inner diameter of the rubber thread (421) abuts against the outer circumference of the center tube (101); the rotation direction of the rubber thread (421) is the same as the rotation direction of the fourth fishing thread (4); when the first limiting sleeve (41) is not threadedly matched with the center tube (101), the fourth fishing thread (4) is spiral; during the gradual tightening of the first limiting sleeve (41), the pitch of the fourth fishing thread (4) gradually decreases; during the axial movement of the first limiting sleeve (41) away from the middle of the center tube (101), the pitch of the fourth fishing thread (4) gradually increases, and the first limiting sleeve (41) damps the rotation relative to the center tube (101).

9. The reverse osmosis membrane element according to claim 6, characterized in that: The surface of the second fishing thread (3) is set to be a rough surface.

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