A rolled membrane module and water purification system

Abstract

The present invention provides a roll-type membrane assembly and a water purification system, wherein the roll-type membrane assembly comprises: a central tube (102), the central tube (102) being a cylindrical structure, the cylindrical structure comprising an inner wall (102d) and an outer wall (102e), a support sleeve (202b) of a cylindrical structure being further arranged on the radial inner side of the central tube (102), the inner side of the inner wall of the support sleeve (202b) having a cavity (102f), at least one water-through hole being further arranged on the support sleeve (202b) in the form of penetrating the inner wall and the outer wall thereof, and the central tube (102) being made of a filter material that allows fluid to pass through, so as to allow the fluid to flow from the outer wall (102e) to the inner wall (102d) and reach the cavity (102f) through the support sleeve (202b). The present invention can form a primary filtering effect through the central tube itself, realize the integration of the central tube structure function, not only can support the roll membrane and collect the produced water but also realize the filtering effect, effectively reduce the increase of the filter element volume, and help reduce the volume of the whole machine.

Description

Technical Field

[0001] The invention belongs to the technical field of water purification, and in particular relates to a rolled membrane assembly and a water purification system. Background Art

[0002] Existing spiral membrane elements all need to be wound around a central tube made of plastic parts, which supports the spiral membrane and collects produced water. In addition, when the spiral membrane is in use, its rear end needs to be connected in series with a taste-improving filter element, which increases the number of filter elements and is not conducive to reducing the volume of the entire unit.

[0003] Since the function of the central tube in the roll membrane in the prior art is to support the roll membrane and collect produced water, there is a technical problem that a taste improvement filter element needs to be connected in series at the rear end, thereby increasing the number of filter elements and being unfavorable for reducing the volume of the whole machine. Therefore, the present invention studies and designs a roll membrane assembly and a water purification system. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the central tube of the roll membrane in the prior art has a single function, so if the filtering effect needs to be improved, the number of filter elements needs to be increased, resulting in an increase in volume, thereby providing a roll membrane assembly and a water purification system.

[0005] The present invention provides a spiral membrane assembly, which comprises a central tube,

[0006] The center tube is a cylindrical structure, which includes an inner wall and an outer wall. A support sleeve with a cylindrical structure is also provided on the radial inner side of the center tube. The inner side of the inner wall of the support sleeve has a cavity. The support sleeve is also provided with at least one water hole. The center tube is made of a filter material that allows fluid to pass through, so as to allow the fluid to flow from the outer wall to the inner wall, pass through the support sleeve and reach the cavity, or allow the fluid to flow from the cavity to the outer wall via the support sleeve and the inner wall.

[0007] Preferably,

[0008] The filter material that allows fluid to pass through includes at least one of carbon material, polypropylene (PP) material and ceramic material.

[0009] Preferably,

[0010] The central tube is a cylindrical carbon rod structure composed of the carbon material; or, the central tube is a cylindrical PP structure composed of the polypropylene PP material; or, the central tube is a cylindrical ceramic tube structure composed of the ceramic material.

[0011] Preferably,

[0012] The invention also includes a wound membrane which is wound around the outer circumference of the central tube, and the wound membrane can allow water to pass through and filter the water.

[0013] Preferably,

[0014] It also includes a first end cover disposed at one axial end of the central tube, wherein the first end cover can seal the one axial end of the central tube; and / or,

[0015] It also includes a second end cover arranged at the other axial end of the central tube, and a water outlet joint is connected to the radial inner side of the second end cover to allow water in the central tube to flow out from the water outlet joint.

[0016] Preferably,

[0017] The first end cover includes a first extension arm located radially outward and extending in the axial direction and a second extension arm located radially inward and extending in the axial direction, and a space is formed between the first extension arm and the second extension arm to clamp the inner wall and the outer wall of the central tube.

[0018] Preferably,

[0019] The second extension arm is fitted and clamped on the inner wall of the axial end of the center tube; the outer wall of the center tube also forms a first step at the position of the axial end, and the first extension arm is clamped with the first step so that the outer circumferential surface of the first extension arm is flush with the outer circumferential surface of the center tube.

[0020] Preferably,

[0021] A film rolling groove for rolling the film is formed at the center position of the first end cover toward the axial direction of the center tube; and / or, a first fixing rib is axially extended between the first extension arm and the second extension arm of the first end cover, and a fixing groove is axially recessed at one axial end of the center tube, and the first fixing rib can form a clamping position with the fixing groove; and / or, at least one first limiting rib is protrudingly provided on the first end cover in a direction opposite to the extension direction of the first extension arm and the second extension arm.

[0022] Preferably,

[0023] The second end cover includes a third extension arm located radially outward and extending in the axial direction, and a fourth extension arm located radially inward and extending in the axial direction, and a space is formed between the third extension arm and the fourth extension arm to clamp the inner wall and outer wall of the other axial end of the center tube.

[0024] Preferably,

[0025] The fourth extension arm is fitted and clamped on the inner wall of the other axial end of the center tube; and / or the outer wall of the center tube is also formed with a second step at the position of the other axial end, and the third extension arm is clamped on the outer peripheral wall of the second step so that the outer peripheral surface of the third extension arm is flush with the outer peripheral surface of the center tube.

[0026] Preferably,

[0027] A second fixing rib is axially extended between the third extension arm and the fourth extension arm of the second end cover, and a fixing groove is axially recessed at the other axial end of the center tube, and the second fixing rib can form a clamping limit with the fixing groove; and / or, a second limiting rib is radially protruding on the inner side of the fourth extension arm of the second end cover, and the second limiting rib can form a limit and / or positioning with the water outlet joint.

[0028] Preferably,

[0029] The connecting part between the first end cover and the center tube is also connected by bonding; and / or, the connecting part between the second end cover and the center tube is also connected by bonding; and / or, the roll membrane is wound around the periphery of the first end cover at one axial end of the center tube; and / or, the roll membrane is wound around the periphery of the second end cover at the other axial end of the center tube.

[0030] Preferably,

[0031] The rolled membrane includes a rolled membrane sheet, a glue line, a water-producing spacer and a water-inlet spacer, the rolled membrane sheet includes a separation layer and a non-separation layer, and the rolled membrane sheet is folded in half at the separation layer, the water-inlet spacer is placed in the folded position of the rolled membrane sheet, and one side of the non-separation layer is overlapped between the water-producing spacer, and the glue line is arranged on the inner peripheral side of the rolled membrane and at a position opposite to the first end cover and / or the second end cover.

[0032] The present invention also provides a water purification system, which comprises the roll membrane assembly described in any of the preceding items.

[0033] The present invention provides a spiral membrane module and a water purification system having the following beneficial effects:

[0034] 1. The present invention makes the central tube of the water purifier made of a filter material that allows fluid to pass through, so that water can flow through the central tube made of the filter material, thereby forming a primary filtering effect on the water. Compared with the structure in the prior art that requires the addition of filter element technology to improve the filtering effect, the central tube itself can form a primary filtering effect, realizing the integration of the central tube structure and function, so that it can not only support the roll membrane and collect the produced water but also achieve the filtering effect, effectively reducing the increase in the volume of the filter element, which is conducive to the effective reduction of the volume of the whole machine;

[0035] 2. The present invention can abandon the plastic center tube used in the existing rolled membrane, avoid the use of the plastic center tube of the existing rolled membrane element, and realize that one membrane element has a two-stage filtration function; by using the carbon center tube, the subsequent use of the taste filter element can be avoided, and the membrane element integrates the two-stage filtration functions of the fine filtration filter element and the post-taste filter element; the carbon center tube has no visible macropores, and its surface is covered with structural micropores. Compared with the traditional plastic center tube with visible macropores, the water produced by the rolled membrane is easier to collect. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a front cross-sectional structural schematic diagram of a spiral membrane module with a central tube of the present invention;

[0037] Figure 2a yes Figure 1 A cross-sectional structural diagram of the central tube in FIG.

[0038] Figure 2b yes Figure 2a The left view of the central tube in FIG.

[0039] Figure 3a yes Figure 1 A cross-sectional structural diagram of the first end cover;

[0040] Figure 3b yes Figure 3a A left view of the first end cover;

[0041] Figure 4 yes Figure 1 A cross-sectional structural diagram of the second end cover;

[0042] Figure 5 It is a structural schematic diagram of the unfolding of the rolled membrane of the rolled membrane module with a central tube of the present invention;

[0043] Figure 6 It is a front structural schematic diagram of the support sleeve of the present invention.

[0044] The reference numerals in the figure represent:

[0045] 101, first end cover; 101a, membrane roll slot; 101b, first fixing rib; 101c, first limiting rib; 101d, first extension arm; 101e, second extension arm; 102, center tube; 102a, first step; 102b, second step; 102c, fixing slot; 102d, inner wall; 102e, outer wall; 102f, cavity; 103, membrane roll; 104, second end cover; 104a, second limiting rib; 104b, second fixing rib; 104c, third extension arm; 104d, fourth extension arm; 105, water outlet joint; 201, membrane roll; 202, rubber line; 202a, water hole; 202b, support sleeve; 203, water production screen. DETAILED DESCRIPTION

[0046] like Figure 1-5 As shown, the present invention provides a roll membrane assembly, which includes a central tube, and the central tube 102 is a cylindrical structure, the cylindrical structure includes an inner wall 102d and an outer wall 102e, the radial inner side of the central tube 102 is also provided with a cylindrical support sleeve 202b, the inner side of the inner wall of the support sleeve 202b has a cavity 102f, the support sleeve 202b is also provided with at least one water hole 202a in the form of penetrating the inner wall and outer wall of the support sleeve, and the central tube 102 is made of a filter material that allows fluid to pass (preferably permeable) to allow the fluid to flow from the cavity via the support sleeve 202b, the inner wall 102d to the outer wall 102e, or from the outer wall 102e to the inner wall 102d, through the support sleeve 202b to reach the cavity 102f.

[0047] The present invention makes the central tube of the water purifier made of a filter material that allows fluid to pass through, so that water can flow through the central tube made of the filter material, thereby forming a primary filtering effect on the water. Compared with the structure in the prior art that requires the addition of filter element technology to improve the filtering effect, the central tube itself can form a primary filtering effect, realizing the integration of the structural functions of the central tube, so that it can not only support the roll membrane and collect the produced water but also achieve the filtering effect, effectively reducing the increase in the volume of the filter element, and facilitating the effective reduction of the volume of the whole machine. In addition, by arranging a support sleeve on the radial inner side of the inner wall of the central tube, it can support the material with filtering function (because it has a filtering function, usually its structural strength is not enough to support or the support strength is not high enough), thereby improving the firm fixation of the central tube and providing conditions for achieving long-term filtering.

[0048] The existing central tube is a plastic central tube with only a hole in the center of the tube and other places are closed. As a result, the water produced by the diaphragm in the non-perforated area needs to flow along the wall into the perforated area, with a long flow path; while the water produced by the diaphragm in the perforated area goes directly out of the membrane hole, with a short flow path. If a carbon rod is used as the central tube, the water produced by the diaphragm in contact with the carbon rod can be promptly guided into the cavity because of the uniform structural microporous structure distributed on its surface. The post-positioned carbon rod filter element is made into a structure that can be wrapped around the RO membrane, which can realize the composite of the RO membrane and the post-positioned filter element, and realize the one-core two-stage purification function.

[0049] Preferably,

[0050] The filter material that allows fluid to pass through includes at least one of carbon material, polypropylene pp material and ceramic material. This is the preferred material of the filter material of the present invention, which can effectively allow water to pass through. In addition, it can also filter the water passing through it, and can achieve a primary filtering effect while supporting the central tube, thereby overcoming the defect of increased volume due to increased filter element levels, reducing volume and saving costs.

[0051] Preferably,

[0052] The central tube 102 is a cylindrical carbon rod structure composed of the carbon material; or, the central tube 102 is a cylindrical PP structure composed of the polypropylene PP material; or, the central tube 102 is a cylindrical ceramic tube structure composed of the ceramic material. This is the preferred filtering structure form of the present invention, such as the carbon rod, PP cylindrical and ceramic tube structure forms.

[0053] The filter material that allows fluid to pass through the present invention may include: carbon rods, cylindrical polypropylene pp material filter materials, ceramic tubes, etc. It is preferred to use carbon that can improve the taste as the central tube material of the roll membrane element, and the plastic central tube used in the existing roll membrane can be discarded, avoiding the use of the existing plastic central tube of the roll membrane element, and realizing that a membrane element has a two-stage filtration function; using the carbon central tube, it is possible to avoid the subsequent use of the taste filter element, and the membrane element integrates the two-stage filtration functions of the fine filter element and the post-placed taste filter element; the carbon central tube has no visible macropores, and its surface is covered with structural micropores. Compared with the central tube with visible macropores of traditional plastic parts, the water produced by the roll membrane is easier to collect. The PP cylindrical central tube can effectively remove various particulate impurities in the filtered liquid, and can be a multi-layer depth structure, with a large dirt holding capacity, a large filtration flow rate, a small pressure difference, does not contain any chemical adhesives, is more hygienic, safe, acid, alkali, organic solution, oil, has good chemical stability, and integrates surface, deep, coarse and fine filtration; it has the characteristics of large flow, corrosion resistance, high pressure resistance, and low cost. It is used to block large particles such as rust, sand, and insect eggs in the water. The ceramic cylindrical center tube can filter, sterilize and activate drinking water, remove harmful residual chlorine and suspended pollutants, organic chemicals, color and odor, and filter drinking water that meets certain drinking standards by using this filter element.

[0054] The carbon rod material is brittle, and adding a strength support tube in the cavity can enhance the strength of the carbon rod center tube.

[0055] Preferably,

[0056] The roll membrane assembly of the present invention also includes a roll membrane 103 wound around the outer circumference of the central tube 102, and the roll membrane 103 can allow water to pass through and filter the water. The roll membrane assembly of the present invention utilizes a central tube (filter material) of a new structural form and is rolled with a roll membrane, so that the prepared roll membrane assembly has two-stage filtering functions at the same time, and can allow water to flow through the central tube made of the filter material, thereby forming a primary filtering effect on the water. Compared with the structure in the prior art that requires the addition of filter element technology to improve the filtering effect, the central tube itself can form a primary filtering effect, realizing the integration of the structural function of the central tube, so that it can not only support the roll membrane and collect produced water, but also achieve filtering, effectively reducing the increase in the volume of the filter element, which is conducive to the effective reduction of the volume of the whole machine.

[0057] In the technical solution of the present invention, the water produced by the roll membrane is in direct contact with the post-filter element (i.e., the central tube with filtering function), which reduces the energy loss caused by the long flow path, thereby reducing the back pressure. The beneficial effect is that the water produced by the roll membrane is discharged more smoothly, which can effectively slow down the membrane structure trend and the water flow rate is large under the same membrane area.

[0058] Preferably,

[0059] It also includes a first end cover 101 disposed at one axial end of the central tube 102, wherein the first end cover can seal the one axial end of the central tube 102; and / or,

[0060] It also includes a second end cover 104 that is snap-fitted to the other axial end of the central tube 102 , and a water outlet joint 105 is also connected to the radial inner side of the second end cover 104 to allow water in the central tube 102 to flow out from the water outlet joint 105 .

[0061] This is the structural form of the first end cap at one axial end of the central tube of the present invention and the structural form of the second end cap at the other axial end. The first end cap can form a sealing effect on the axial end of the central tube, so that the water at this end can penetrate from the end surface of the roll membrane 103 and then enter the central tube and the cavity, achieving the effect of secondary filtration. The water flowing out through the roll membrane 103 is concentrated water, and the water flowing out through the inner cavity of the central tube is pure water. Figure 1 As shown, the second end cover can clamp and seal the other axial end of the central tube, so that water can only flow out from the water outlet joint inside the central tube (pure water) or from the lower end of the roll membrane (concentrated water).

[0062] Preferably,

[0063] The first end cover 101 includes a first extension arm 101d located radially outward and extending in the axial direction, and a second extension arm 101e located radially inward and extending in the axial direction, and a space is formed between the first extension arm 101d and the second extension arm 101e to clamp the inner wall and the outer wall of the central tube 102. This is a further preferred structural form of the first end cover of the present invention, and the first and second extension arms can form a clamping connection with one axial end of the central tube, which is convenient for assembly and positioning.

[0064] Preferably,

[0065] The second extension arm 101e is fitted and clamped on the inner wall of the axial end of the central tube 102; the outer wall of the central tube 102 is also formed with a first step 102a at the position of the axial end, and the first extension arm 101d is clamped with the first step 102a so that the outer circumference of the first extension arm 101d is flush with the outer circumference of the central tube 102. This is a structural form in which the first extension arm and the second extension arm of the present invention are matched and connected with the inner and outer walls of the central tube respectively, which can achieve effective clamping between the central tubes while ensuring that the outer circumference of the central tube is flush with the outer circumference of the first extension arm, so as to facilitate the roll film to be rolled on the outer circumference.

[0066] Preferably,

[0067] A film rolling groove 101a for rolling the film is formed at the center position of the first end cover 101 in the axial direction of the center tube 102; and / or, a first fixing rib 101b is axially extended between the first extension arm 101d and the second extension arm 101e of the first end cover 101, and a fixing groove 102c is axially recessed at the axial end of the center tube 102, and the first fixing rib 101b can form a clamping limit with the fixing groove 102c to clamp and fix the end face of the axial end of the center tube 102; and / or, at least one first limiting rib 101c is protrudingly provided on the first end cover 101 in a direction opposite to the extension direction of the first extension arm 101d and the second extension arm 101e.

[0068] This is a further preferred structural form provided on the first end cover and the corresponding parts of the center tube of the present invention. The film rolling slot allows the shaft of the film rolling machine to be inserted therein when rolling the film, driving the center tube to rotate and thus realizing the film rolling effect of the rolled film; the first fixed rib and the fixed groove provided on the end face of the center tube can form a snap fit between the two, which can form a positioning or limiting effect when assembling the first end cover and the center tube, thereby improving the assembly effect; the first limiting rib can make the first end cover protrude upward to form a protruding structure, so that water can pass through the protrusions and flow downward from the upper end face of the rolled film, thereby ensuring normal water flow.

[0069] Preferably,

[0070] The second end cover 104 includes a third extension arm 104c located radially outward and extending in the axial direction, and a fourth extension arm 104d located radially inward and extending in the axial direction, and a space is formed between the third extension arm 104c and the fourth extension arm 104d to clamp the inner wall and the outer wall of the other axial end of the central tube 102. This is a further preferred structural form of the second end cover of the present invention, and the third and fourth extension arms can be provided to form a clamping connection with the other axial end of the central tube, which is convenient for assembly and positioning.

[0071] Preferably,

[0072] The fourth extension arm 104d is fitted and clamped at the inner wall of the other axial end of the central tube; and / or, the outer wall of the central tube 102 is also formed with a second step 102b at the position of the other axial end, and the third extension arm 104c is clamped at the outer peripheral wall of the second step 102b, so that the outer peripheral surface of the third extension arm 104c is flush with the outer peripheral surface of the central tube 102. This is a structural form in which the third extension arm and the fourth extension arm of the present invention are matched and connected with the inner and outer walls of the central tube respectively, which can achieve effective clamping between the central tubes while ensuring that the outer peripheral surface of the central tube is flush with the outer peripheral surface of the third extension arm, so as to facilitate the roll film to be rolled on the outer peripheral surface.

[0073] Preferably,

[0074] A second fixing rib 104b is also axially extended between the third extension arm 104c and the fourth extension arm 104d of the second end cover 104, and a fixing groove 102c is also axially recessed at the other axial end of the center tube 102. The second fixing rib 104b can form a clamping limit with the fixing groove 102c to clamp and fix the end face of the other axial end of the center tube 102; and / or, a second limiting rib 104a is also radially protruding on the inner side of the fourth extension arm 104d of the second end cover 104, and the second limiting rib 104a can form a limit and / or positioning with the water outlet joint 105.

[0075] This is a further preferred structural form provided on the second end cover and the corresponding parts of the center tube of the present invention. The second fixing rib and the fixing groove provided on the end face of the center tube can form a snap fit between the two, which can form a positioning or limiting effect when assembling the first end cover and the center tube, thereby improving the assembly effect; the second limiting rib can form a limiting effect on the water outlet joint, forming a positioning assembly, thereby improving the assembly effect.

[0076] Preferably,

[0077] The connecting portion between the first end cover 101 and the central tube 102 is also connected by bonding; and / or, the connecting portion between the second end cover 104 and the central tube 102 is also connected by bonding; and / or, the roll film 103 is wound around the periphery of the first end cover 101 at one axial end of the central tube 102; and / or, the roll film 103 is wound around the periphery of the second end cover 104 at the other axial end of the central tube 102.

[0078] The first end cap and the second end cap are respectively connected to the central tube by bonding, which improves the connection firmness between the end caps and the central tube and improves the sealing strength. The roll membrane is wound on the end caps to improve the winding effect and the sealing effect. The assembly form of the various parts of the carbon central tube is as follows: the first end cap 101 and the second end cap 104 are fixedly connected to the corresponding steps at both ends of the carbon rod by adhesive. The water outlet joint 105 is directly installed in the second end cap 104 after the roll membrane is rolled, and its function is to guide pure water.

[0079] Preferably,

[0080] The roll membrane 103 includes a roll membrane sheet 201, a glue line 202, a water production spacer 203 and a water inlet spacer. The roll membrane sheet 201 includes a separation layer and a non-separation layer, and the roll membrane sheet 201 is folded in half at the separation layer. The water inlet spacer is placed in the folded position of the roll membrane sheet, and one side of the non-separation layer is overlapped with the water production spacer 203. The glue line 202 is arranged on the inner circumference of the roll membrane 103 and at a position opposite to the first end cap 101 and / or the second end cap 104. This is the preferred structural form of the roll membrane of the present invention. The water production spacer is wound around the outer periphery of the central tube, and the roll membrane sheet is then wound around the outer periphery of the water production spacer. The glue line is placed at the corresponding position of the end cap to enable the membrane sheet and the end cap to be sealed and connected by adhesive.

[0081] When the carbonaceous central tube is used to prepare a roll membrane, the roll membrane schematic diagram is as follows: Figure 5 shown.

[0082] The rolled diaphragm 201 is evenly distributed on the end caps near both ends of the carbonaceous central tube, the water-producing screen 203, the water-producing screen 203 and the rolled diaphragm 201 are placed overlapping, and the glue line is punched near the edge of the rolled diaphragm 201 and the water-producing screen 203 but does not overlap with the edge, and needs to keep a distance from the edge line. At the same time, the glue line 202 needs to be punched on the first end cap 101 and the second end cap 104. Its function is to achieve sealing of the rolled membrane element with the help of the end caps. If it is punched on the carbonaceous central tube, it cannot be sealed due to its porous structure.

[0083] The present invention also provides a water purification system, which comprises the roll membrane assembly described in any of the preceding items.

[0084] The present invention makes the central tube of the water purifier made of a filter material that allows fluid to pass through, so that water can flow through the central tube made of the filter material, thereby forming a primary filtering effect on the water. Compared with the structure in the prior art that requires the addition of filter element technology to improve the filtering effect, the central tube itself can form a primary filtering effect, realizing the integration of the structural functions of the central tube, so that it can not only support the roll membrane and collect the produced water but also achieve the filtering effect, effectively reducing the increase in the volume of the filter element, which is conducive to the effective reduction of the volume of the whole machine;

[0085] The present invention can abandon the plastic center tube used in the existing rolled membrane, avoid the use of the plastic center tube of the existing rolled membrane element, and realize that one membrane element has a two-stage filtration function; using the carbon center tube, it can avoid the subsequent use of the taste filter element, and the membrane element integrates the two-stage filtration functions of the fine filtration filter element and the post-placed taste filter element; the carbon center tube has no visible macropores, and its surface is covered with structural micropores. Compared with the traditional plastic center tube with visible macropores, the water produced by the rolled membrane is easier to collect.

[0086] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention. These improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A spiral membrane module, Features: include: A central tube (102), the central tube (102) being a cylindrical structure, the cylindrical structure comprising an inner wall (102d) and an outer wall (102e), a support sleeve (202b) of a cylindrical structure being further provided on the radial inner side of the central tube (102), the inner side of the inner wall of the support sleeve (202b) comprising a cavity (102f), the support sleeve (202b) being further provided with at least one water-through hole (202a), and the central tube (102) being made of a filter material that allows fluid to pass through, so as to allow fluid to flow from the outer wall (102e) to the inner wall (102d), pass through the support sleeve (202b) and reach the cavity (102f), or to allow fluid to flow from the cavity via the support sleeve (202b) and the inner wall (102d) to the outer wall (102e); It also includes a rolled membrane (103) wound around the outer circumference of the central tube (102), wherein the rolled membrane (103) is capable of allowing water to pass through and filtering the water; It also includes a first end cover (101) arranged at one axial end of the central tube (102), the first end cover being capable of sealing the one axial end of the central tube (102); and a second end cover (104) arranged at the other axial end of the central tube (102), the radial inner side of the second end cover (104) being connected to a water outlet joint (105) to allow water in the interior of the central tube (102) to flow out from the water outlet joint (105); The first end cover (101) comprises a first extension arm (101d) located radially outward and extending in the axial direction, and a second extension arm (101e) located radially inward and extending in the axial direction, wherein a space capable of clamping the inner wall and the outer wall of the center tube (102) is formed between the first extension arm (101d) and the second extension arm (101e); a first fixing rib (101b) is also axially extended between the first extension arm (101d) and the second extension arm (101e) of the first end cover (101), and a fixing groove (102c) is also axially recessed at one axial end of the center tube (102), and the first fixing rib (101b) can form a clamping limit with the fixing groove (102c); The rolled membrane (103) is wound around one axial end of the central tube (102) and arranged on the periphery of the first end cover (101); the rolled membrane (103) is wound around the other axial end of the central tube (102) and arranged on the periphery of the second end cover (104); at least part of the structure of the rolled membrane (103) is located on the periphery of the central tube (102).

2. The wound membrane assembly according to claim 1, Features: The filter material that allows fluid to pass through includes at least one of carbon material, polypropylene (PP) material and ceramic material.

3. The wound membrane assembly according to claim 2, Features: The central tube (102) is a cylindrical carbon rod structure composed of the carbon material; or, the central tube (102) is a cylindrical PP structure composed of the polypropylene PP material; or, the central tube (102) is a cylindrical ceramic tube structure composed of the ceramic material.

4. The wound membrane module according to claim 1, Features: The second extension arm (101e) is fitted and clamped on the inner wall of the axial end of the central tube (102); the outer wall of the central tube (102) is also formed with a first step (102a) at the position of the axial end, and the first extension arm (101d) is clamped with the first step (102a) so that the outer peripheral surface of the first extension arm (101d) is flush with the outer peripheral surface of the central tube (102).

5. The wound membrane module according to claim 1, Features: A film rolling groove (101a) for rolling a film is formed at a central position of the first end cover (101) in an axial direction toward the central tube (102); and / or at least one first limiting rib (101c) is protrudingly provided on the first end cover (101) in a direction opposite to the extension direction of the first extension arm (101d) and the second extension arm (101e).

6. The wound membrane module according to claim 1, Features: The second end cover (104) comprises a third extension arm (104c) located radially outward and extending in the axial direction, and a fourth extension arm (104d) located radially inward and extending in the axial direction, wherein a space is formed between the third extension arm (104c) and the fourth extension arm (104d) to clamp the inner wall and the outer wall of the other axial end of the center tube (102).

7. The wound membrane module according to claim 6, Features: The fourth extension arm (104d) is fitted and clamped on the inner wall of the other axial end of the central tube; and / or the outer wall of the central tube (102) is also formed with a second step (102b) at the position of the other axial end, and the third extension arm (104c) is clamped on the outer peripheral wall of the second step (102b) so that the outer peripheral surface of the third extension arm (104c) is flush with the outer peripheral surface of the central tube (102).

8. The wound membrane module according to claim 6, Features: A second fixing rib (104b) is also axially extended between the third extension arm (104c) and the fourth extension arm (104d) of the second end cover (104), and a fixing groove (102c) is also axially recessed at the other axial end of the center tube (102), and the second fixing rib (104b) can form a clamping limit with the fixing groove (102c); and / or, a second limiting rib (104a) is also radially protruding and axially extended on the inner side of the fourth extension arm (104d) of the second end cover (104), and the second limiting rib (104a) can form a limit and / or positioning with the water outlet joint (105).

9. The spiral wound membrane module according to any one of claims 1 to 8, Features: The connecting portion between the first end cover (101) and the central tube (102) is also connected by bonding; and / or the connecting portion between the second end cover (104) and the central tube (102) is also connected by bonding.

10. The spiral wound membrane module according to claim 9, Features: The rolled membrane (103) comprises a rolled membrane sheet (201), a glue line (202), a water-producing spacer (203) and a water-inlet spacer; the rolled membrane sheet (201) comprises a separation layer and a non-separation layer, and the rolled membrane sheet (201) is folded in half at the separation layer; the water-inlet spacer is placed in the folded position of the rolled membrane sheet, and one side of the non-separation layer is overlapped with the water-producing spacer (203); and the glue line (202) is arranged on the inner circumference of the rolled membrane (103) and at a position opposite to the first end cover (101) and / or the second end cover (104).

11. A water purification system, Features: The invention comprises the wound membrane module according to any one of claims 1 to 10.

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