A rolled membrane stage filter element and a water purifier

Abstract

The present invention provides a rolled membrane segmented filter element and a water purifier, wherein: the rolled membrane segmented filter element includes a central tube and an integral membrane, wherein the integral membrane includes a first axial end and a second axial end along the axis of the central tube; the manufacturing method includes: a gluing step, wherein a partition is provided in the raw water flow channel of the integral membrane to separate the integral membrane into a first filter element and a second filter element, the partition having a first notch, through which water in the first raw water flow channel of the first filter element flows into the second raw water flow channel of the second filter element; and a rolling step, wherein the glued integral membrane is rolled around the outer periphery of the central tube. The present invention can improve the utilization rate of the membrane and significantly reduce its volume, effectively minimizing its volume while improving the utilization rate of the membrane.

Description

Technical Field

[0001] The present invention belongs to the technical field of water purification, and in particular relates to a rolled membrane segmented filter element and a water purifier. Background Art

[0002] Reverse osmosis filtration is currently the most effective and indispensable water purification component of water purifiers. Improving the structure of reverse osmosis membrane elements and enhancing water purification performance are the research and development directions of water purifiers. Currently, reverse osmosis has single element, single-stage parallel and multi-stage series forms, but each has its own problems:

[0003] Question 1: The single-element reverse osmosis water purification system is the smallest yet most complete reverse osmosis system and is currently the most widely used water purifier. However, the traditional single-element filter element has a low membrane surface flow rate, the membrane surface flow rate cannot be adjusted, and the filter element does not have the characteristics of long life;

[0004] Question 2: The single-stage reverse osmosis parallel form is to arrange two or more membrane elements in parallel to purify water together. The more membrane elements there are, the higher the recovery rate will be to a certain extent. Due to the diversion of the influent and the low pressure of the purified water of each membrane element, the service life will be extended. However, it will occupy a large volume, the production cost is high, and the cost-effectiveness is low.

[0005] Question 3: The multi-stage reverse osmosis series form is to connect the membrane elements in series, and the concentrated water of the previous stage is used as the inlet water of the next stage. It is the most effective water purification system to improve the recovery rate. However, due to the different inlet water quality of each membrane element, the life of the membrane elements is different, the filter element replacement is cumbersome, and there are also problems such as large size and additional cost due to balancing the inlet water pressure of each section.

[0006] All of the aforementioned reverse osmosis methods suffer from short service lives, large size, and high costs. Currently, household water purifiers are pursuing smaller sizes, lower costs, and less frequent filter replacements. Extending the life of a single-stage filter cartridge inevitably requires reducing the filter recovery rate to alleviate the pressure on the membrane, leading to lower water production rates. Otherwise, excessive concentration factors can easily lead to scaling and clogging of the filter cartridge, leading to filter failure.

[0007] Earlier, the applicant of the present invention applied for a patent for a segmented filter element, which uses a central tube to roll an entire diaphragm. After the film is rolled, the diaphragm is cut into at least two parts using a membrane repair process. Compared with the segmented central tube and segmented diaphragm in the prior art, it can effectively reduce the volume. However, when repairing the membrane, a gap needs to be reserved to cut out the excess membrane, so the width of the glue needs to be occupied, resulting in a high scrap rate of the diaphragm (that is, low membrane utilization).

[0008] Since the existing staged filter element assembly has technical problems such as being unable to reduce the filter element volume while improving membrane utilization, the present invention studies and designs a rolled membrane staged filter element and a water purifier. Summary of the Invention

[0009] Therefore, the technical problem to be solved by the present invention is to overcome the defect of the segmented filter element assembly in the prior art that it is impossible to reduce the filter element volume while improving the membrane utilization rate, thereby providing a rolled membrane segmented filter element and a water purifier.

[0010] The present invention provides a rolled membrane segmented filter element, which comprises:

[0011] A central tube and an integral diaphragm, wherein along the axis direction of the central tube, the integral diaphragm includes an axial first end and an axial second end;

[0012] A separator is provided in the raw water flow channel of the integral diaphragm to separate the integral diaphragm into a first filter element and a second filter element, the separator having a first notch to enable water in the first raw water flow channel of the first filter element to flow into the second raw water flow channel of the second filter element through the first notch;

[0013] The integral diaphragm after the partition is provided is rolled around the outer circumference of the central tube.

[0014] In some embodiments, the separator includes a first glue line and a second glue line, the first glue line includes a first end and a second end, and the second glue line includes a third end and a fourth end;

[0015] The first end of the first rubber line is located on the first axial end or is spaced a first preset distance from the first axial end, and the second end extends toward the second axial end;

[0016] The third end of the second rubber line is located on the second axial end or is spaced a second preset distance from the second axial end, and the fourth end extends toward the first axial end;

[0017] The first gap is formed between the second end and the fourth end.

[0018] In some embodiments, before providing the separator, the entire membrane is folded to form two opposite front sides and two opposite back sides, the raw water flow channel is formed between the two opposite front sides, and the pure water flow channel is formed between adjacent back sides;

[0019] The whole membrane is folded to form a folded edge, a first long edge, a second long edge and an open end, the folded edge is in contact with the central tube and rolled, the first long edge is located at the first axial end, and the second long edge is located at the second axial end;

[0020] The first glue line and the second glue line are both arranged on the front side of the folded integral diaphragm to separate the integral diaphragm into the first filter element and the second filter element. The first filter element includes a first raw water flow channel formed between its two opposite front sides and a first pure water flow channel located on the back side of the first filter element. The second filter element includes a second raw water flow channel formed between its two opposite front sides and a second pure water flow channel located on the back side of the second filter element. The outlet of the first raw water flow channel is connected to the second raw water flow channel through the first notch.

[0021] In some embodiments, within the plane in which the entire diaphragm is unfolded, the radial distance between the second end of the first glue line and the folded edge is smaller than the radial distance between the first end and the folded edge; the radial distance between the fourth end of the second glue line and the folded edge is smaller than the radial distance between the third end and the folded edge.

[0022] In some embodiments, the open end forms a first water inlet of the first raw water flow channel, and the first notch forms a first water outlet of the first raw water flow channel;

[0023] The second filter element of the second section forms a second water outlet at the first axial end, and the second filter element of the second section forms a second water inlet at the second axial end.

[0024] In some embodiments, a porous supporting layer tape is provided at the open end, so that the first water inlet is formed at the porous portion, and the first water inlet is multiple and spaced apart.

[0025] In some embodiments, the length of the second filter element at the first axial end is L1, the length of the second filter element at the second axial end is L2, the axial length of the first notch along the central tube is L3, and L1≥L2>L3.

[0026] In some embodiments, within the unfolded surface of the integral membrane, the area S1 of the first raw water flow channel of the first filter element and the area S2 of the second raw water flow channel of the second filter element satisfy the relationship: S1:S2=0.8:1~2:1.

[0027] In some embodiments, after the integral diaphragm is rolled around the outer periphery of the central tube, the end surface of the first axial end of the first filter element is sealed with an end cap to form a first sealing surface, and the end surface of the second axial end of the first filter element is sealed with an end cap to form a second sealing surface;

[0028] The first sealing surface, the second sealing surface, the first glue line and the second glue line form the first raw water flow channel; and the first glue line, the second glue line and the folded edge form the second raw water flow channel.

[0029] In some embodiments, before the integral diaphragm is rolled around the outer circumference of the central tube, a third glue line and a fourth glue line are further provided between two opposite front surfaces of the integral diaphragm, one end of the third glue line is connected to the open end, and the other end extends in the direction of the folded edge to connect to one end of the first glue line, and the third glue line is provided close to the axial first end relative to the axial second end, one end of the fourth glue line is connected to the open end, and the other end extends in the direction of the folded edge to connect to one end of the second glue line, and the fourth glue line is provided close to the axial second end relative to the axial first end;

[0030] The third rubber line, the fourth rubber line, the first rubber line and the second rubber line form the first raw water flow channel; and the first rubber line, the second rubber line and the folded edge form the second raw water flow channel.

[0031] In some embodiments, in the plane where the entire diaphragm is unfolded, an angle θ is set between the first glue line and the third glue line, and 90°<θ<180°; an angle α is set between the second glue line and the fourth glue line, and 90°<α<180°.

[0032] In some embodiments, after the first glue line is set, a position on the first glue line relative to the second end and close to the first end is cut to form a second notch.

[0033] In some embodiments, the second end of the first glue line is opposite to the fourth end of the second glue line in the axial direction of the center tube, or the distance between the second end of the first glue line and the folded edge in the radial direction of the center tube is greater than the distance between the fourth end of the second glue line and the folded edge in the radial direction of the center tube.

[0034] The present invention also provides a water purifier, which includes the aforementioned rolled membrane segmented filter element, and also includes a pretreatment filter element, a control component, a pump, a post-treatment filter element and a wastewater solenoid valve. The rolled membrane segmented filter element also includes a membrane shell, and the membrane shell has a raw water inlet, a pure water outlet and a concentrated water outlet. The pump is connected to the raw water inlet, the post-treatment filter element is connected to the pure water outlet, and the wastewater solenoid valve is connected to the concentrated water outlet.

[0035] In some embodiments, the spiral membrane stage filter element has a same-end water inlet and outlet structure, the raw water inlet, the pure water outlet, and the concentrated water outlet are all arranged at the same axial end of the membrane housing, and the pump is connected to the raw water inlet through a first pipeline; or,

[0036] The rolled membrane segmented filter element has a structure with water inlet at both ends, and includes two raw water inlets, one of which is arranged at the same axial end of the membrane shell as the pure water outlet and the concentrated water outlet, and the other is arranged at the other axial end of the membrane shell. The pump is connected to one of the raw water inlets through a first pipeline, and the pump is also connected to the other raw water inlet through a second pipeline.

[0037] The present invention provides a rolled membrane segmented filter element and a water purifier having the following beneficial effects:

[0038] The present invention provides a separator in the raw water flow channel of the integral diaphragm before the integral diaphragm is rolled around the periphery of the central tube, so as to effectively divide the diaphragm into the first and second filter elements. Water in the first raw water flow channel of the first filter element can flow through the first notch to the second raw water flow channel of the second filter element, thereby separating the two raw water flow channels by providing a separator (preferably by gluing), i.e. forming a staged filter element with at least two sections, without having to cut the membrane (membrane repair process), and enabling the raw water in the first filter element to pass through the first notch and then enter the second filter element for filtration after being filtered. , effectively forming the effect of segmented filtration, and compared with the solution of forming a segmented filter element by repairing the membrane in the prior art, there is no need to reserve a certain length of membrane between the two sections of the filter element membrane and cut to form an interval cavity (the necessary structure and steps for repairing the membrane to form a segmented filter element), that is, there is no need to cut off part of the membrane, thereby reducing the waste and scrap of the membrane, and thus effectively improving the utilization rate of the membrane, and by forming the structure of the segmented filter element, the volume can be greatly reduced, while improving the utilization rate of the membrane, it can also effectively minimize the volume; it can simultaneously achieve the effects of small volume, compact structure and high membrane utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 Schematic diagram of the membrane unit structure of the stage filter element of the present invention;

[0040] Figure 2 This is a structural diagram of the glue line arrangement before the membrane roll of the segmented filter element in Example 1 of the present invention;

[0041] Figure 3 This is a bottom view of the structure of the segmented filter element after the membrane is rolled up according to Example 1 of the present invention (its top view also has the sealing surface);

[0042] Figure 41 is a structural diagram of the water flow channel 1 of the staged filter element after expansion in Example 1 of the present invention;

[0043] Figure 4a yes Figure 4 The structural diagram of the water flow channel 1 of the stage filter element after the membrane roll;

[0044] Figure 5 This is a structural diagram of the water flow channel 2 of the stage-type filter element after expansion in Example 2 of the present invention;

[0045] Figure 5a yes Figure 5 The structure diagram of the water flow channel 2 of the stage filter element after the membrane roll;

[0046] Figure 6 This is a structural diagram of the water inlet and outlet at the same end of the filter element assembly of the present invention;

[0047] Figure 7 This is a structural diagram of a water purification system including a same-end water inlet and outlet filter element assembly according to the present invention;

[0048] Figure 8 This is a structural diagram of the water inlet and outlet at both ends of the filter element assembly of the present invention;

[0049] Figure 9 This is a structural diagram of a water purification system including water inlet and outlet filter elements at both ends of the present invention;

[0050] Figure 10a This is a structural diagram of the glue line arrangement before the membrane roll of the segmented filter element of Example 3 of the present invention;

[0051] Figure 10b This is a structural diagram of the glue line arrangement before the membrane roll of the segmented filter element of Example 4 of the present invention;

[0052] Figure 11 This is a structural diagram of the glue line arrangement before the membrane is rolled up in the segmented filter element of Example 5 of the present invention.

[0053] The reference numerals in the figures are as follows:

[0054] 1. Center tube; 11. Pure water outlet; 2. Integral diaphragm; 21. First filter element; 22. Second filter element; 23. First axial end; 24. Second axial end; 25. Folded edge; 26. Open end; 27. First water inlet; 28. Second water outlet; 29. ​​Second water inlet; 210. Front; 211. Back; 212. Pure water guide fabric; 213. Water inlet grid; 3. Separator; 31. First rubber line; 311. First end; 312. Second end. 32. Second rubber line; 321. Third end; 322. Fourth end; 33. First gap; 34. First sealing surface; 35. Second sealing surface; 36. Porous support layer tape; 37. Third rubber line; 38. Fourth rubber line; 39. Second gap; 4. Pre-treatment filter element; 5. Pump; 6. Control component; 7. Wastewater solenoid valve; 8. Post-treatment filter element; 9. Membrane housing; 91. Raw water inlet; 92. Concentrated water outlet; 101. First pipeline; 102. Second pipeline. DETAILED DESCRIPTION

[0055] like Figure 1-11 As shown, the present invention provides a rolled membrane segmented filter element (the rolled membrane segmented filter element of the present invention is a segmented filter element formed by rolling a rolled membrane assembly, especially a first-stage and second-stage filter element, but is not limited thereto), which includes:

[0056] The central tube 1 and the integral diaphragm 2 include an axial first end 23 and an axial second end 24 along the axial direction of the central tube 1;

[0057] A separator 3 (preferably a separator rubber line, including the first and second rubber lines described below) is provided in the raw water flow channel of the integral diaphragm 2 to separate the integral diaphragm 2 into a first filter element 21 and a second filter element 22. The separator 3 has a first notch 33 to allow water in the first raw water flow channel of the first filter element 21 to flow into the second raw water flow channel of the second filter element 22 through the first notch 33.

[0058] After the separator 3 is provided, the integral membrane 2 is rolled around the outer periphery of the central tube 1 .

[0059] The present invention provides a separator in the raw water flow channel of the integral diaphragm before the integral diaphragm is rolled around the periphery of the central tube, so as to effectively divide the diaphragm into the first and second filter elements. Water in the first raw water flow channel of the first filter element can flow through the first notch to the second raw water flow channel of the second filter element, thereby separating the two raw water flow channels by providing a separator (preferably by gluing), i.e. forming a staged filter element with at least two sections, without having to cut the membrane (membrane repair process), and enabling the raw water in the first filter element to pass through the first notch and then enter the second filter element for filtration after being filtered. , effectively forming the effect of segmented filtration, and compared with the solution of forming a segmented filter element by repairing the membrane in the prior art, there is no need to reserve a certain length of membrane between the two sections of the filter element membrane and cut to form an interval cavity (the necessary structure and steps for repairing the membrane to form a segmented filter element), that is, there is no need to cut off part of the membrane, thereby reducing the waste and scrap of the membrane, and thus effectively improving the utilization rate of the membrane, and by forming the structure of the segmented filter element, the volume can be greatly reduced, while improving the utilization rate of the membrane, it can also effectively minimize the volume; it can simultaneously achieve the effects of small volume, compact structure and high membrane utilization.

[0060] In some embodiments, the separator 3 includes a first glue line 31 and a second glue line 32 , wherein the first glue line 31 includes a first end 311 and a second end 312 , and the second glue line 32 includes a third end 321 and a fourth end 322 ;

[0061] The first end 311 of the first glue line 31 is located on the first axial end 23 or is spaced a first preset distance from the first axial end 23 , and the second end 312 extends toward the second axial end 24 ;

[0062] The third end 321 of the second rubber line 32 is located on the second axial end 24 or is spaced a second preset distance from the second axial end 24 , and the fourth end 322 extends toward the first axial end 23 ;

[0063] The first gap 33 is formed between the second end 312 and the fourth end 322 .

[0064] This is the preferred structural form of the separator of the present invention, that is, through the structural form of the first rubber line and the second rubber line, the first rubber line extends from the side of the axial first end toward the axial second end, and the second rubber line extends from the side of the axial second end toward the axial first end, so that the required first gap is formed between the two free ends of the first rubber line and the second rubber line, which is used to increase the speed due to the reduction of the flow cross-sectional area when the first raw water flow channel flows to the first gap, thereby reducing concentration polarization and improving the ability to prevent scale.

[0065] In order to solve the problems of water purification performance, volume and service life of reverse osmosis components, the present invention starts from the design concept of multi-stage series connection of reverse osmosis and conforms to the development trend of small volume. Through the design of gluing process (i.e., the method of forming the first and second glue lines, which is not limited to gluing, and can also be adopted by setting methods such as double-sided tape, but gluing is preferred), it successfully realizes multi-stage integrated filter element technology on a single filter element, solves the problems of short service life due to the unadjustable membrane surface flow rate of a single element, and the volume and cost problems caused by parallel or series connection of multiple filter elements, and maximizes the utilization value of the reverse osmosis membrane element area.

[0066] The present invention is based on roll membrane technology and reverse osmosis multi-stage series form, combined with the filter element gluing process (including two steps of filter element rolling and secondary processing after membrane repair), and can have the following effects: 1) Multi-stage water purification is achieved on a membrane by gluing, and the filter element completes the water purification segmentation design before rolling, which is different from the traditional physical segmentation stage water purification; 2) The filter element rolling and forming only requires two glue lines, and can be bonded with tape, which has high controllability, low membrane area occupied by glue lines, and membrane usage can be reduced or membrane utilization rate is improved; 3) The area ratio of the first water purification area to the second water purification area can be controlled by adjusting the glue line, limiting the scaling area and obtaining the best water purification performance; 4) The water purification system is redesigned around the new filter element, and the membrane surface flow rate is controlled by adjusting the water inlet and water inlet channel, which can effectively extend the life of the filter element. The multi-stage integrated rolled membrane filter element segmented filtration technology is realized in one filter element. Compared with the existing single-stage filter element with short filtration life and the segmented filter element technology with multiple filter elements connected in series, the integrated design has a promoting effect on the filter element service life, production cost, water purification efficiency, and reduction of filter element volume and the volume of the corresponding model.

[0067] In some embodiments, before the separator 3 is provided, the entire membrane 2 is folded to form two opposite front sides and two opposite back sides, the raw water flow channel is formed between the two opposite front sides, and the pure water flow channel is formed between the adjacent back sides;

[0068] The whole membrane 2 is folded to form a folded edge 25, a first long side, a second long side, and an open end 26. The folded edge 25 is rolled in contact with the central tube 1. The first long side is located at the first axial end 23, and the second long side is located at the second axial end 24.

[0069] The first glue line 31 and the second glue line 32 are both arranged on the front side of the folded integral diaphragm 2 to separate the integral diaphragm 2 into the first-section filter element 21 and the second-section filter element 22. The first-section filter element 21 includes a first raw water flow channel formed between its two opposite front sides and a first pure water flow channel located on the back side of the first-section filter element 21. The second-section filter element 22 includes a second raw water flow channel formed between its two opposite front sides and a second pure water flow channel located on the back side of the second-section filter element 22. The outlet of the first raw water flow channel is connected to the inlet of the second raw water flow channel through the first notch 33.

[0070] This is a further preferred structural form of the present invention. By setting a folding step before the gluing step, the diaphragm can be effectively folded into a structure with a folded edge, a front and a back, and an open end. The open end can be used for water intake, and a raw water flow channel is formed between the front sides, and a pure water flow channel is formed between the back sides. The first and second glue lines of the present invention separate the raw water flow channel into at least two parts, namely, the first and second raw water flow channels, forming a segmented filtration structure. The present invention manufactures the central tube and the overall diaphragm as one, avoiding the situation where the membrane utilization rate is reduced due to the use of multiple segmented structures, and replaces the original method of needing to repair the membrane to form a segmented filter element. The structure is more compact and miniaturized, and the production is simpler. The fluid can be accelerated at the first notch, thereby effectively preventing the formation of scale and improving the service life.

[0071] In some embodiments, within the unfolded plane of the integral diaphragm 2, the radial distance between the second end 312 of the first glue line 31 and the folded edge 25 is smaller than the radial distance between the first end 311 and the folded edge 25; the radial distance between the fourth end 322 of the second glue line 32 and the folded edge 25 is smaller than the radial distance between the third end 321 and the folded edge 25. This is the preferred arrangement method for the first and second glue lines of the present invention, i.e., the second end of the first glue line is closer to the folded edge relative to the first end, and the fourth end of the second glue line is closer to the folded edge relative to the third end, so as to form the following: Figure 4 The forward-constricting structure shown is beneficial to the flow of fluid while maximizing the flow rate. The flow rate can be maximized at the first notch, thereby maximizing the ability to prevent scale and increasing the service life of the filter element.

[0072] In some embodiments, the open end 26 forms a first water inlet 27 of the first raw water flow channel, and the first notch 33 forms a first water outlet of the first raw water flow channel;

[0073] The second filter element 22 forms a second water outlet 28 at the first axial end 23 (preferably without glue), and forms a second water inlet 29 at the second axial end 24 (preferably without glue).

[0074] This is the preferred arrangement of the water inlet and water outlet of the present invention, that is, the open end forms a first water inlet, so that the raw water enters the first raw water flow channel through the open end, and the first gap forms a first water outlet, so that the concentrated water filtered by the first filter element enters the second raw water flow channel through the first gap for further filtration, thereby increasing the flow rate of the raw water and reducing concentration polarization. In addition, the present invention also sets a second water inlet at one end of the second filter element and a water outlet at the other end, so that the water entering through the second water inlet can effectively drive the raw water from the first gap to move in the axial direction, so that the filtered concentrated water flows out from the second water outlet, further increasing the flow rate and promoting the flow.

[0075] In some embodiments, a porous support layer tape 36 is provided at the open end 26, forming the first water inlet 27 at the porous portion, so that the first water inlet 27 is multiple and spaced apart. The present invention, by providing the porous support layer tape at the open end, can separate the first water inlet into a plurality of spaced-apart structures, thereby achieving a multi-hole water inlet effect and increasing speed and pressure.

[0076] In some embodiments, the length of the second filter element 22 at the first axial end 23 is L1 (L1 is the radial distance between the folded edge 25 and the first end 311), the length of the second filter element 22 at the second axial end 24 is L2 (L2 is the axial distance between the folded edge 25 and the third end 321), and the axial length of the first notch 33 along the center tube 1 is L3, where L1 ≥ L2 > L3. By setting the length L1 of the second water outlet of the second filter element to be greater than the length L2 of the second water inlet, the present invention can cause the fluid to first increase in speed and then decrease in speed during the process of flowing from the second water inlet to the second water outlet. The acceleration process can increase the flow rate, especially the speed of the water flowing from the first notch. The increased flow area in the later stage can achieve the effect of pressure expansion and stabilization, so that the water pressure at the concentrated water outlet is more stable and discharged to the desired location.

[0077] In some embodiments, within the unfolded surface of the integral membrane 2, the area S1 of the first raw water flow channel of the first filter element 21 and the area S2 of the second raw water flow channel of the second filter element 22 satisfy the relationship S1:S2 = 0.8:1 to 2:1. By setting the areas of the first and second filter elements to satisfy this relationship, the present invention effectively regulates the flow rate.

[0078] Example 1-2, as Figure 4-5aIn some embodiments, after the integral diaphragm 2 is rolled around the outer periphery of the central tube 1, the end surface of the first axial end 23 of the first filter element 21 is sealed with an end cap to form a first sealing surface 34, and the end surface of the second axial end 24 of the first filter element 21 is sealed with an end cap to form a second sealing surface 35;

[0079] The first sealing surface 34 , the second sealing surface 35 , the first glue line 31 and the second glue line 32 form the first raw water flow channel; and the first glue line 31 , the second glue line 32 and the folded edge 25 form the second raw water flow channel.

[0080] This is the preferred form of embodiment 1-2 of the present invention, that is, by setting sealing surfaces at the two axial end faces of the first section filter element for effective sealing, both axial ends of the raw water flow channel and the pure water flow channel can be sealed, and the first and second sealing surfaces and the first and second glue lines effectively form the first raw water flow channel, forming a constricted outlet to increase the flow rate.

[0081] Example 3, as Figures 10a-11 In some embodiments, before the integral diaphragm 2 is rolled around the outer circumference of the central tube 1, a third glue line 37 and a fourth glue line 38 are further provided between two opposite front surfaces of the integral diaphragm 2. One end of the third glue line 37 is connected to the open end 26, and the other end extends toward the folded edge 25 to connect with one end of the first glue line 31. The third glue line 37 is provided near the axial first end 23 relative to the axial second end 24. One end of the fourth glue line 38 is connected to the open end 26, and the other end extends toward the folded edge 25 to connect with one end of the second glue line 32. The fourth glue line 38 is provided near the axial second end 24 relative to the axial first end 23.

[0082] The third glue line 37 , the fourth glue line 38 , the first glue line 31 and the second glue line 32 form the first raw water flow channel; and the first glue line 31 , the second glue line 32 and the folded edge 25 form the second raw water flow channel.

[0083] This is the preferred gluing form of Example 3 of the present invention, that is, a third glue line set at a first preset distance from the first axial end can be connected to the first glue line, and a fourth glue line set at a second preset distance from the second axial end can be connected to the second glue line. The first, second, third and fourth glue lines are used to jointly form a first raw water flow channel, forming a constricted structure, thereby increasing the flow rate, preventing the formation of scale, and increasing the service life of the filter element.

[0084] In some embodiments, within the unfolded plane of the integral diaphragm 2, an angle θ is defined between the first glue line 31 and the third glue line 37, with 90° < θ < 180°; an angle α is defined between the second glue line 32 and the fourth glue line 38, with 90° < α < 180°. This is a preferred embodiment of the caulking step of the present invention, forming an obtuse-angle structure as shown in the figure. This effectively guides raw water forward, gradually reducing the flow cross-sectional area and increasing the flow velocity, reaching maximum velocity at the first notch, or the throat. This increases flow velocity, prevents scale formation, and improves service life.

[0085] The diaphragm partition and glue line setting of embodiment 3 of the present invention is to realize multi-stage integrated filter element technology by gluing on a filter element. Figures 10a-10b The membrane is divided into two sections, S1 is the first section of the water purification area, S2 is the second section of the water purification area, and the separator between S1 and S2 is realized by gluing (gluing or tape bonding) combined with end cap sealing. The ratio of the membrane area of ​​S1 and S2 is controlled by adjusting the position of the glue line, so that S1:S2=0.8:1~2:1. Figures 10a-10b In the settings shown, the distance between the ends of the upper and lower glue lines and the center tube is L1=L2 or L1>L2. The upper and lower edges are glued and sealed, and they do not overlap with the outer edge of the membrane. A certain distance needs to be left for rolling the filter element and repairing the membrane after the glue solidifies. The end of the membrane does not need to be glued to be used as the first water inlet. The starting end of the separator is offset by θ°>90° based on the upper and lower edges respectively. The distance between the ends of the two separators is L3, which can be increased appropriately to prevent the glue from spreading during film rolling and causing the ends of the glue lines to stick together. Each membrane sheet placed needs to be pressed Figures 10a-10b The glue is applied in the glue-applying method shown. The last membrane page is placed and glued before being rolled up. The rolled filter element is cylindrical.

[0086] Filter element winding, film repair and sealing. There are two ways to wind the filter element in this technical solution, such as Figures 10a-10b As shown, the first water channel form uses a porous outer support layer of tape as the last layer of the filter element to effectively wrap and support the filter element, improving its stability. The tape hole is used as the first water inlet, which has a certain limit on the water flow rate. The second water channel form does not require the outer support layer of tape to be rolled up. The membrane cloth rolls up by itself after the glue is cured. The relative stability is limited, but the filter element can be fully filled with water from the side, and the water flow rate is large. After the filter element is rolled up, it is adapted and trimmed, and the two ends are flat to ensure the subsequent assembly seal. After sealing with glue, the end cap is used to fix the state as shown. Figure 5 shown.

[0087] In some embodiments, after the first glue line 31 is set, a portion of the first glue line 31 that is close to the first end 311 and relative to the second end 312 is cut to form a second notch 39 .

[0088] This is a further preferred gluing method of Example 3 of the present invention, that is, by forming a second notch structure, it can effectively prevent the formation of scale at the corner, and timely discharge the water there through the second notch, which can further improve the ability to prevent scale and increase the service life of the filter element.

[0089] like Figure 11 As shown, due to the water flow path, the first water purification area of ​​the present invention may have a dead angle at the inclined end in the direction of the pure water outlet, which is easy to crystallize and form scale. Therefore, a notch can be set on the partition at the upper end, and the notch glue line is set so that the trapezoidal area formed between the notch and the central tube is equal to the triangular area in the figure. The equivalent principle is used to offset the slow water flow rate that may exist in the triangular area, thereby slowing down scaling.

[0090] In some embodiments, the second end 312 is opposite to the fourth end 322 of the second glue line 32 in the axial direction of the central tube 1, or the distance between the second end 312 of the first glue line 31 and the folded edge 25 in the radial direction of the central tube 1 is greater than the distance between the fourth end 322 of the second glue line 32 and the folded edge 25 in the radial direction of the central tube 1.

[0091] This is a further preferred structural form of the first and second rubber lines of the present invention, that is, the two can be relative or staggered in the axial direction, both of which can effectively increase the flow rate, form a staged filter element, improve the ability to prevent scale, and increase the service life.

[0092] The filter element obtained by adopting this technical solution has different assembly methods. This technical solution is to redesign the water flow channel and its water purification system to adapt to the filter element. Figure 6 、 7 As shown, the structure of the water inlet and outlet filter element assembly at the same end is consistent with that of the traditional filter element assembly, and it contains a pure water outlet, a concentrated water outlet and a raw water inlet, all of which are at the upper end. In this system, the raw water is processed by the pre-treatment filter element and then pressurized by the pump to enter the reverse osmosis filter element assembly from the raw water inlet. A portion of the raw water enters the first section of the filter element from the side for filtration, the pure water is led out and passes through the post-treatment filter element, and the concentrated water enters the second section of the filter element and is driven by pressure as the raw water of the second section, and is further filtered and purified to achieve secondary utilization of the concentrated water; the other portion of the raw water enters from the bottom of the filter element assembly and flows directly into the second section of the filter element to be mixed and filtered with the concentrated water from the first section, the pure water is led out, and the concentrated water is discharged from the concentrated water outlet. Figure 8 、 9As shown, the water inlet filter element components at both ends also contain a pure water outlet and a concentrated water outlet on the same side of the upper end. There are two raw water inlets, which are respectively placed at the upper and lower ends of the component, and the second section water inlet at the bottom of the filter element and the first section water inlet on the side realize sealed separation of the water path and pressure maintenance. In this system, the raw water is processed by the pre-treatment filter element and pressurized by the pump and divided into two water paths. One part of the raw water enters the first section of the filter element from the side of the filter element from the upper raw water inlet, and the other part directly enters the second section of the filter element from the lower raw water inlet and is mixed with the concentrated water from the first section for filtration. The pure water is collected and discharged by the central pipe and also passes through the post-treatment filter element.

[0093] The present invention also provides a water purifier, which includes the aforementioned rolled membrane stage filter element, and also includes a pretreatment filter element 4, a control component 6, a pump 5, a post-treatment filter element 8 and a wastewater solenoid valve 7. The rolled membrane stage filter element also includes a membrane shell 9, and the membrane shell 9 has a raw water inlet 91, a pure water outlet 11 and a concentrated water outlet 92. The pump 5 is connected to the raw water inlet 91, the post-treatment filter element 8 is connected to the pure water outlet 11, and the wastewater solenoid valve 7 is connected to the concentrated water outlet 92.

[0094] In some embodiments, the spiral membrane stage filter element has a same-end water inlet and outlet structure, the raw water inlet 91, the pure water outlet 11 and the concentrated water outlet 92 are all arranged at the same axial end of the membrane housing 9, and the pump 5 is connected to the raw water inlet 91 through the first pipeline 101; or,

[0095] The rolled membrane stage filter element has a structure with water inlet at both ends. The raw water inlet 91 includes two, one of which is arranged at the same axial end of the membrane shell 9 as the pure water outlet 11 and the concentrated water outlet 92, and the other is arranged at the other axial end of the membrane shell 9. The pump 5 is connected to one of the raw water inlets 91 through a first pipeline 101, and the pump 5 is also connected to the other raw water inlet 91 through a second pipeline 102.

[0096] These are two different water inlet methods and structures of the present invention, such as Figure 6-7 As shown in 8-9, Figure 6-7 The best solution is a structure where water enters and exits the filter element at the same end. Figure 8-9 It is a structure where water enters from both ends of the filter element.

[0097] The above is a description of the structural system of the filter element assembly and water purification system that realizes multi-stage integrated filter element filtration technology on a filter element. Compared with other forms of reverse osmosis filter element systems, the obtained filter element has advantages in cost, volume, performance and other aspects in achieving high recovery rates.

[0098] The present invention is based on spiral membrane technology and reverse osmosis multi-stage series form, combined with the glue process, to successfully achieve the function of multi-stage filtration technology in one filter element, which can have the following beneficial effects:

[0099] 1) Through the gluing process, a filter element is equipped with multi-stage integrated filtration technology. The integrated design of the filter element is realized by using a simple process, which plays an important role in reducing the volume of the whole machine.

[0100] 2) Compared with the use of scale inhibitors to reduce membrane surface concentration polarization and scaling, the segmented filter element technology does not have the health and safety issues caused by the release of scale inhibitors;

[0101] 3) Compared to using multiple filter elements in parallel or series to achieve low-frequency filter element replacement, multi-stage integrated filter element technology has a smaller size and lower cost;

[0102] 4) Compared to single filter elements that suffer from membrane contamination due to the pursuit of high water yields and result in a shorter service life, multi-stage integrated filter elements have more stable membrane surface flow rate and filter element service life. By controlling the membrane surface flow rate to prevent excessive concentration polarization on the membrane surface, the filter element service life can be effectively extended.

[0103] 5) Multi-stage integrated filter element technology can make full use of the membrane element area to maximize its value.

[0104] The manufacturing process steps of the filter element of the present invention are as follows:

[0105] (1) Membrane unit. The membrane used in the membrane unit of the present invention is a roll membrane, and the membrane unit also includes a water inlet screen and a pure water guide cloth. Figure 1 As shown, the rolled membrane needs to be staggered and folded at a certain distance (d1), and the placement of different membrane pages also needs to be staggered by a distance (d2). The specific calculation of the distance is: d1=d2=outer diameter of the center tube / number of membrane pages; the bottom membrane page is placed close to the center tube, and the short side after folding is facing downward to maximize the utilization rate of the membrane; the folding direction of the membrane page is that the separation layers are folded towards each other, and a water inlet separator is placed between the two folded separation layers to guide water when the filter element is running and prevent the separation layers from sticking together when the filter element is left for a period of time due to water passing through. The separation layer will be damaged when water is passed through again, while increasing the turbulence of the water entering the separation layer on the membrane surface and slowing down scaling; a pure water guide cloth is placed between the backs of the two folded membrane pages to collect the pure water generated by the membrane pages during operation.

[0106] (2) Diaphragm partitioning and glue line setting. This technical solution is to achieve multi-stage integrated filter element technology by gluing on a filter element. Figure 2The membrane is divided into two sections, S1 is the first section of the water purification area, S2 is the second section of the water purification area, and the separator between S1 and S2 is realized by gluing (gluing or tape bonding) combined with end cap sealing. The ratio of the membrane areas of S1 and S2 is controlled by adjusting the position of the glue line, so that S1:S2 = 0.8:1~2:1 (the adjustment of the two area ratios is to adjust the ratio of the two sections of filtration, which is similar to the ratio of the number of traditional stage filter elements of 4:2:1). The glue line is as follows Figure 3 As shown in the arrangement, the starting end of the separator is respectively at a distance of L1=L2 from the central tube or L1>L2 (the present invention is achieved by Figure 4 、 Figure 5 、 Figure 10a and Figure 10b The adjustment of L3 and L2 can adjust the flow rate of the second section), and the upper and lower edges are used as references to offset the center tube direction θ°> 90° (greater than 90° can control the water flow channel and flow rate, avoid dead angles, the size is to adjust the area and water flow rate), the ends of the two separators are L3 apart, and can be glued with tape or glue. Note that if glue is used, L3 should be increased appropriately to prevent the glue from diffusing during film rolling and causing the glue line end to stick together. Each film sheet placed needs to be pressed Figure 2 The glue application method shown is to perform tape bonding or glue application, and the last membrane sheet is placed and glued before being rolled up. The rolled filter element is cylindrical.

[0107] (3) Filter element winding, film repair and sealing. The present invention uses an end cap to seal the bottom end of the filter element, such as Figure 3 To trim the bottom cross-section of the filter element after leveling, calculate the area of ​​the sealing surface and the second water inlet surface based on the ratio of the clean water area S1 and S2, apply a certain amount of glue to the fixed position of the end cover, cover the bottom of the filter element with sealing and wait for the glue to cure for 24 hours; the filter element of this technical solution has two water inlet methods, and the corresponding winding methods are also different, such as Figure 4 As shown, the water flow channel form 1 uses a porous outer support layer tape as the last layer of the filter element winding, which can effectively wrap and support the filter element, improve its stability, and use the tape hole as the first section of the water inlet, which has a certain restriction effect on the water flow and channel; the water flow channel form 2 does not require the outer support layer tape winding, and the membrane cloth is only sealed and fixed into a roll by the end caps at both ends. The relative stability is limited, but the filter element can be fully filled with water from the side, and the water inlet is uniform. The filter element sealing state is as shown in the figure. Figure 5 shown.

[0108] The above description is merely 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 principles of the present invention shall be included within the scope of protection of the present invention. The above description is merely a preferred embodiment of the present invention. It should be noted that those skilled in the art can make various improvements and variations without departing from the technical principles of the present invention, and such improvements and variations shall also be considered within the scope of protection of the present invention.

Claims

1. A rolled membrane stage filter element, characterized by: include: A central tube (1) and an integral diaphragm (2), wherein along the axial direction of the central tube (1), the integral diaphragm (2) comprises an axial first end (23) and an axial second end (24); A separator (3) is provided in the raw water flow channel of the integral diaphragm (2) to separate the integral diaphragm (2) into a first filter element (21) and a second filter element (22); the separator (3) has a first notch (33) to enable water in the first raw water flow channel of the first filter element (21) to flow into the second raw water flow channel of the second filter element (22) through the first notch (33); After the separator (3) is provided, the integral diaphragm (2) is rolled onto the outer periphery of the central tube (1); The separator (3) comprises a first glue line (31) and a second glue line (32), the first glue line (31) comprises a first end (311) and a second end (312), and the second glue line (32) comprises a third end (321) and a fourth end (322); The first end (311) of the first glue line (31) is located on the axial first end (23) or is spaced apart from the axial first end (23) by a first preset distance, and the second end (312) extends toward the axial second end (24); The third end (321) of the second glue line (32) is located on the axial second end (24) or is spaced a second preset distance from the axial second end (24), and the fourth end (322) extends toward the axial first end (23); The first gap (33) is formed between the second end (312) and the fourth end (322); Before arranging the separator (3), the whole membrane (2) is folded to form two opposite front sides and two opposite back sides, the raw water flow channel is formed between the two opposite front sides, and the pure water flow channel is formed between the adjacent back sides; The integral membrane (2) is folded to form a folded edge (25), a first long side, a second long side and an open end (26), the folded edge (25) being fitted to the central tube (1) and rolled, the first long side being located at the first axial end (23), and the second long side being located at the second axial end (24); The first glue line (31) and the second glue line (32) are both arranged on the front side of the folded integral diaphragm (2) to separate the integral diaphragm (2) into the first filter element (21) and the second filter element (22), the first filter element (21) including a first raw water flow channel formed between two opposite front sides thereof and a first pure water flow channel located on the back side of the first filter element (21), the second filter element (22) including a second raw water flow channel formed between two opposite front sides thereof and a second pure water flow channel located on the back side of the second filter element (22); the outlet of the first raw water flow channel is connected to the second raw water flow channel through the first notch (33); The open end (26) forms a first water inlet (27) of the first raw water flow channel, and the first notch (33) forms a first water outlet of the first raw water flow channel; The second filter element (22) forms a second water outlet (28) at the first axial end (23), and the second filter element (22) forms a second water inlet (29) at the second axial end (24); The length of the second filter element (22) at the first axial end (23) is L1, the length of the second filter element (22) at the second axial end (24) is L2, the axial length of the first notch (33) along the central tube (1) is L3, and L1≥L2>L3.

2. The rolled membrane stage filter element according to claim 1, characterized in that: In the plane in which the integral diaphragm (2) is unfolded, the radial distance between the second end (312) of the first glue line (31) and the folded edge (25) is smaller than the radial distance between the first end (311) and the folded edge (25); and the radial distance between the fourth end (322) of the second glue line (32) and the folded edge (25) is smaller than the radial distance between the third end (321) and the folded edge (25).

3. The rolled membrane stage filter element according to claim 1, characterized in that: A porous supporting layer tape (36) is provided at the open end (26), so that the first water inlet (27) is formed at the porous portion, and the first water inlet (27) is multiple and spaced apart.

4. The rolled membrane stage filter element according to claim 1, characterized in that: In the unfolded surface of the integral membrane (2), the area S1 of the first raw water flow channel of the first filter element (21) and the area S2 of the second raw water flow channel of the second filter element (22) satisfy the relationship: S1:S2=0.8:1~2:

1.

5. The rolled membrane stage filter element according to claim 1, characterized in that: After the integral diaphragm (2) is rolled onto the outer periphery of the central tube (1), the end surface of the first axial end (23) of the first filter element (21) is sealed with an end cap to form a first sealing surface (34), and the end surface of the second axial end (24) of the first filter element (21) is sealed with an end cap to form a second sealing surface (35); The first sealing surface (34), the second sealing surface (35), the first glue line (31) and the second glue line (32) form the first raw water flow channel; and the first glue line (31), the second glue line (32) and the folding edge (25) form the second raw water flow channel.

6. The wound membrane stage filter element according to any one of claims 1 to 5, characterized in that: Before the integral diaphragm (2) is rolled onto the periphery of the central tube (1), a third glue line (37) and a fourth glue line (38) are further provided between two opposite front surfaces of the integral diaphragm (2), one end of the third glue line (37) being connected to the open end (26), and the other end extending in the direction of the folding edge (25) to be connected to one end of the first glue line (31), the third glue line (37) being provided relative to the axial second end (24) and close to the axial first end (23), the fourth glue line (38) being provided relative to the axial first end (23) and close to the axial second end (24); The third glue line (37), the fourth glue line (38), the first glue line (31) and the second glue line (32) form the first raw water flow channel; and the first glue line (31), the second glue line (32) and the folded edge (25) form the second raw water flow channel.

7. The rolled membrane stage filter element according to claim 6, characterized in that: In the plane where the integral diaphragm (2) is unfolded, an angle θ is set between the first glue line (31) and the third glue line (37), and 90°<θ<180°; an angle α is set between the second glue line (32) and the fourth glue line (38), and 90°<α<180°.

8. The rolled membrane stage filter element according to claim 6, characterized in that: After the first glue line (31) is set, a position on the first glue line (31) relative to the second end (312) and close to the first end (311) is cut to form a second notch (39).

9. The wound membrane stage filter element according to any one of claims 1 to 5, characterized in that: The second end (312) of the first glue line (31) and the fourth end (322) of the second glue line (32) are opposite to each other in the axial direction of the central tube (1), or the distance between the second end (312) of the first glue line (31) and the folded edge (25) in the radial direction of the central tube (1) is greater than the distance between the fourth end (322) of the second glue line (32) and the folded edge (25) in the radial direction of the central tube (1).

10. A water purifier, characterized in that: The invention comprises the roll-type membrane segmented filter element according to any one of claims 1 to 9, and further comprises a pre-treatment filter element (4), a control component (6), a pump (5), a post-treatment filter element (8) and a wastewater solenoid valve (7), wherein the roll-type membrane segmented filter element further comprises a membrane shell (9), the membrane shell (9) having a raw water inlet (91), a pure water outlet (11) and a concentrated water outlet (92), the pump (5) being connected to the raw water inlet (91), the post-treatment filter element (8) being connected to the pure water outlet (11), and the wastewater solenoid valve (7) being connected to the concentrated water outlet (92).

11. The water purifier according to claim 10, characterized in that: The rolled membrane stage filter element has a structure with water inlet and outlet at the same end, the raw water inlet (91), the pure water outlet (11) and the concentrated water outlet (92) are all arranged at the same axial end of the membrane shell (9), and the pump (5) is connected to the raw water inlet (91) through a first pipeline (101); or, The rolled membrane stage filter element has a structure with water inlet at both ends, and includes two raw water inlets (91), one of which is arranged at the same axial end of the membrane shell (9) as the pure water outlet (11) and the concentrated water outlet (92), and the other is arranged at the other axial end of the membrane shell (9). The pump (5) is connected to one of the raw water inlets (91) through a first pipeline (101), and the pump (5) is also connected to the other raw water inlet (91) through a second pipeline (102).

Images