An integrated rolled membrane filter element and water purifier with staged filtration function

Abstract

The present invention provides an integrated rolled membrane filter element and a water purifier with a staged filtration function. The integrated rolled membrane filter element comprises: a central tube, a diaphragm, a rubber line, and a connector. The diaphragm is an integral diaphragm and is rolled on the outer periphery of the central tube. Along the axial direction of the central tube, the diaphragm includes an axial first end and an axial second end, and the rubber line includes an inter-segment separation rubber line set between the axial first end and the axial second end before rolling to separate the diaphragm into a first-segment filter element and a second-segment filter element. After the diaphragm is rolled onto the central tube, the membrane is repaired along the direction of the inter-segment separation rubber line to separate the first-segment filter element and the second-segment filter element, and the central tube is further cut radially inward. The two cut central tube sections are connected by a connector to form a gap. The present invention can improve the utilization rate of the diaphragm and effectively reduce the scrap rate of the filter element during the membrane repair process.

Description

Technical Field

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

[0002] Long life is a development trend of water purifiers, and its main ways to achieve it include adding chemical antiscalants, connecting multiple spiral membranes in series to form staged filtration, etc. However, although both of the above technologies can achieve long life, they have the following problems:

[0003] Question 1: Adding chemical antiscalants can achieve a good antiscaling effect and extend the life of the filter element, but there are health and safety issues caused by the release of antiscaling substances;

[0004] Question 2: Compared with a single-stage rolled membrane filter element, the stage technology of multiple rolled membrane filter elements in series can improve the life of the whole machine to a certain extent, but for household machines that pursue volume, the technical route needs to be optimized. In the early stage, the applicant of this invention applied for patent 2022103018425, which uses a central tube to roll an entire filter element. After the film is rolled, the membrane is cut into at least two pieces by a membrane repair process. It has been verified that its technical effect can increase the life of the filter element. However, it is necessary to reserve a gap when repairing the membrane, so it is necessary to occupy the width of the glue, resulting in a decrease in the adaptability of the membrane repair process to the deviation of the glue line in the rolling process, and a low qualified rate of membrane repair, resulting in a high scrap rate of the filter element (including components such as the membrane and the central tube).

[0005] Since the existing staged filter element assembly has technical problems such as being unable to simultaneously improve membrane utilization and reduce filter element scrap rate, the present invention studies and designs an integrated roll membrane filter element and water purifier with staged filtration function. Summary of the Invention

[0006] 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 cannot simultaneously improve the membrane utilization rate and reduce the filter element scrap rate, thereby providing an integrated rolled membrane filter element and water purifier with segmented filtration function.

[0007] The present invention provides an integrated rolled membrane filter element with a staged filtration function, comprising:

[0008] A center tube, a diaphragm, a rubber line and a connecting piece, wherein the diaphragm is an integral diaphragm and is rolled around the outer periphery of the center tube. Along the axial direction of the center tube, the diaphragm includes an axial first end and an axial second end, and the rubber line includes an inter-segment separation rubber line arranged between the axial first end and the axial second end before rolling to separate the diaphragm into a first-segment filter element and a second-segment filter element in a staged manner. After the diaphragm is rolled onto the center tube, the membrane is trimmed along the direction of the inter-segment separation rubber line to separate the first-segment filter element and the second-segment filter element, and further radially inwardly toward the center tube is cut off, and the two sections of the cut center tube are connected by a connecting piece to form a gap.

[0009] In some embodiments, the diaphragm is folded to form two opposite front sides and two opposite back sides, a raw water flow channel is formed between the two opposite front sides, and a pure water flow channel is formed between the adjacent back sides; the inter-segment separation glue line is arranged on the back side of the folded diaphragm to seal and separate the pure water flow channels of the two filter elements; the first-section 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-section filter element, and the second-section 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-section filter element; the outlet of the first raw water flow channel is connected to the inlet of the second raw water flow channel.

[0010] In some embodiments, the membrane sheet is folded to form a folded edge, a first long side, a second long side, and an open end, the folded edge is rolled toward the center tube, the first long side is located at the first axial end, the second long side is located at the second axial end, one end of the inter-segment separation rubber line extends to connect with the folded edge, and during the membrane repair process, the inter-segment separation rubber line is cut from the middle to form an inter-segment separation rubber line 1 located on the first segment filter element and an inter-segment separation rubber line 2 located on the second segment filter element;

[0011] The rubber line also includes a filter element first rubber line provided on the back of the first filter element, the filter element first rubber line and the inter-segment separation rubber line forming the first pure water flow channel, and the opening of the first pure water flow channel faces the folded edge;

[0012] The rubber line also includes a second rubber line of the filter element arranged on the back of the second segment filter element. The second rubber line of the filter element and the inter-segment separation rubber line form the second pure water flow channel, and the opening of the second pure water flow channel faces the folded edge.

[0013] In some embodiments, the filter element one rubber line includes a filter element one rubber line one and a filter element one rubber line two, the filter element one rubber line one is arranged relative to the second long side and close to the first long side, the filter element one rubber line two is arranged relative to the folded edge and close to the opening, the filter element one rubber line one extends from the folded edge to connect with the filter element one rubber line two, one end of the filter element one rubber line two is connected to the filter element one rubber line one, and the other end is connected to the inter-segment separation rubber line one;

[0014] The filter element two rubber lines include filter element two rubber line one and filter element two rubber line two. The filter element two rubber line one is set relative to the first long side and close to the second long side. The filter element two rubber line two is set relative to the folded edge and close to the open end. The filter element two rubber line one extends from the folded edge to connect with the filter element two rubber line two. One end of the filter element two rubber line two is connected to the filter element two rubber line one, and the other end is connected to the inter-segment separation rubber line two.

[0015] In some embodiments, within the plane in which the diaphragm is unfolded, the filter element one rubber line one, the inter-segment separation rubber line and the filter element two rubber line one are all arranged in parallel and are perpendicular to the central axis of the central tube, and the filter element one rubber line two and the filter element two rubber line two are located on the same straight line and are parallel to the central axis of the central tube.

[0016] In some embodiments, during the membrane repair process, the filter element one glue line one and the filter element one glue line two are repaired and cut sequentially or simultaneously, and the filter element two glue line one and the filter element two glue line two are repaired and cut sequentially or simultaneously.

[0017] In some embodiments, after the diaphragm 2 is rolled onto the central tube 1 and before the diaphragm 2 is trimmed, a glue curing step is performed. After the glue line is set and lasts for a preset time, the rolled diaphragm 2 is trimmed.

[0018] In some embodiments, pure water diversion hole 1 and pure water diversion hole 2 are provided on the central tube, and both pure water diversion hole 1 and pure water diversion hole 2 pass through the outer wall of the central tube to the inner wall, pure water diversion hole 1 is opposite to the first section filter element, and pure water diversion hole 2 is opposite to the second section filter element, the first pure water flow channel is connected to the pure water diversion hole 1, and the second pure water flow channel is connected to the pure water diversion hole 2.

[0019] In some embodiments, along the axial direction of the central tube, the spacing distance between the closest pure water diversion hole 1 and the closest pure water diversion hole 2 is more than twice the width of the inter-segment separation glue line.

[0020] In some embodiments, the central tube is cut into a first central tube segment and a second central tube segment when the membrane is repaired, and the connecting member is disposed between the first central tube segment and the second central tube segment to connect the first central tube segment and the second central tube segment into one piece;

[0021] The first central tube segment and the second central tube segment are spaced apart, and the connecting piece includes a connecting body and a protrusion. The protrusion is arranged on the outer peripheral wall of the connecting body and protrudes outward, and the protrusion is clamped at the spaced position between the first central tube segment and the second central tube segment.

[0022] In some embodiments, the connecting body is a cylindrical structure, and the protrusion divides the connecting body into a first connecting body and a second connecting body, wherein the first connecting body is located on one axial side of the protrusion, and the second connecting body is located on the other axial side of the protrusion, and the first connecting body is inserted into the first central tube segment, and the second connecting body is inserted into the second central tube segment;

[0023] And / or, the protrusion is an annular structure or a plurality of structures arranged at intervals on the outer peripheral wall of the connecting body, and the outer diameter of the protrusion is flush with the outer diameter of the central tube.

[0024] In some embodiments, after the central tube is cut and the connecting piece is set between the first central tube segment and the second central tube segment, the first filter element and the second filter element are spaced apart to form a cavity, and a water sealing piece is provided at the periphery of the cavity to seal the cavity relative to its periphery.

[0025] The present invention also provides a water purifier, which includes the integrated rolled membrane filter element with staged filtration function as described in any of the preceding items.

[0026] The present invention provides an integrated rolled membrane filter element and a water purifier with a staged filtration function, which have the following beneficial effects:

[0027] The present invention provides a segment separation rubber line between the axial first end and the axial second end of the diaphragm before the membrane is rolled, and cuts the diaphragm into a first filter element and a second filter element along the separation rubber line through a membrane repair process after the membrane is rolled onto the central tube, and further cuts the central tube inwardly into at least two sections, and connects the two sections of the central tube by a connector after cutting, so that a gap is formed between the two sections of the central tube, thereby effectively forming an effective separation cavity between the first and second filter elements, so that the raw water in the first filter element can enter the separation cavity after being filtered. Then it enters the second filter element for filtration, effectively forming a stage-type filtration effect. Compared with the original technology, there is no need to reserve a certain length of membrane between the two filter element membranes and cut to form an interval cavity. The cut membrane area is greatly reduced, which improves the utilization rate of the membrane and greatly increases the adaptability to situations such as winding deviation. It effectively reduces the scrap rate of the filter element in the process of manufacturing the stage-type filter element by processes such as membrane rolling, membrane repair, and gluing (especially reducing the scrap rate of membranes, membrane belts, etc. in the membrane repair process). While improving the utilization rate of the membrane, it can also effectively reduce the scrap rate of the filter element. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 Schematic diagram of the internal structure of the stage filter element of the present invention;

[0029] Figure 2 This is a flow path structure diagram inside the staged filter element of the present invention;

[0030] Figure 3a This is a structural diagram of a water sealing member of a staged filter element of the present invention;

[0031] Figure 3b This is a structural diagram of the water sealing component 2 of the stage-type filter element of the present invention;

[0032] Figure 4 This is a structural diagram of the connector of the stage-type filter element of the present invention;

[0033] Figure 5 This is a structural diagram of the central tube of the stage-type filter element of the present invention before cutting;

[0034] Figure 6 This is a structural diagram of the glue line arrangement before the membrane roll of the segmented filter element of the present invention;

[0035] Figure 7 This is a flow chart of the membrane repair (cutting) of the segmented filter element of the present invention after membrane rolling.

[0036] The reference numerals in the figures are as follows:

[0037] 1. Center tube; 11. Pure water diversion hole 1; 12. Pure water diversion hole 2; 13. First center tube section; 14. Second center tube section; 15. Water baffle; 16. Groove 3; 17. Pure water outlet; 2. Diaphragm; 21. First filter element; 22. Second filter element; 23. First axial end; 24. Second axial end; 25. Folded edge; 26. Open end; 3. Glue line; 31. Separation glue line between sections; 32. Filter element glue line 1; 33. Filter element one, rubber line two; 34, filter element two, rubber line one; 35, filter element two, rubber line two; 4, connector; 41, connecting body; 42, protrusion; 43, groove one; 5, cavity; 61, water sealing part one; 611, positioning column; 612, rib; 613, rubber surface one; 62, water sealing part two; 621, rib one; 622, rib two; 623, groove two; 624, rubber surface two; 7, filter bottle body; 8, filter bottle cover; 9, water inlet grid. DETAILED DESCRIPTION

[0038] The present invention provides an integrated spiral membrane filter element with staged filtration capabilities and its structure. Due to its structural features, the achievable staged filtration capabilities are not limited to one stage and two stages, but can also include one stage and three stages, or even more stages. This invention primarily describes the filter element structure, waterway, and fabrication method for achieving one stage and two stages using the same central tube. The details are as follows:

[0039] Figure 1 It is composed of a staged filter element assembly, including:

[0040] The filter bottle section includes a filter body and a filter cap. One end of the filter body has three water inlets: one for raw water entering the filter element assembly; a second for pure water from the staged filter element assembly; and a third for concentrated water from the staged filter element. The first surface of the filter body 7 is used to fit a sealing ring into the groove of the second water seal 62, which then squeezes and seals the water. The second surface of the filter body 7 is used to fit a sealing ring into the groove 3 16 of the center tube, which then squeezes and seals the water. The filter cap 8 is used to achieve a water-tight seal with the filter body 7 via a spin-melt or threaded connection. The inner wall of the filter cap has a groove for centering the filter element during installation.

[0041] Figure 2 This is a schematic diagram of the water path of the staged filter element assembly. The water inlet of the filter element enters from the raw water inlet, enters the water inlet end face of the first-stage filter element 21 along the outer wall of the second-stage filter element 22 and the first-stage filter element 21, and enters the filter element from the end face for purification. The pure water is collected and discharged through the center tube. The concentrated water of the first-stage filter element 21 serves as the inlet water of the second-stage filter element 22 and enters the end face of the second-stage filter element 22 along the middle of the two-stage filter element for purification. The pure water is also collected and discharged through the center tube, and the concentrated water is discharged through the concentrated water outlet.

[0042] like Figure 1-7As shown, the present invention provides an integrated roll-type membrane filter element with a staged filtration function, which comprises:

[0043] A center tube 1, a diaphragm 2, a rubber line 3 and a connector 4, wherein the diaphragm 2 is an integral diaphragm and is rolled around the outer periphery of the center tube 1. Along the axial direction of the center tube 1, the diaphragm 2 includes an axial first end 23 and an axial second end 24, and the rubber line 3 includes an inter-segment separation rubber line 31 arranged between the axial first end 23 and the axial second end 24 before rolling, so as to separate the diaphragm 2 into a first-segment filter element 21 and a second-segment filter element 22 in a staged manner. After the diaphragm 2 is rolled onto the center tube 1, the membrane is trimmed along the direction of the inter-segment separation rubber line 31 to separate the first-segment filter element 21 and the second-segment filter element 22, and further toward the radial inner side and cut off the center tube 1. The two sections of the center tube 1 after cutting are connected by a connector 4 (detachable or non-detachable) to form a gap.

[0044] The present invention provides a segment separation rubber line between the axial first end and the axial second end of the diaphragm before the membrane is rolled, and cuts the diaphragm into a first filter element and a second filter element along the separation rubber line through a membrane repair process after the membrane is rolled onto the central tube, and further cuts the central tube inwardly into at least two sections, and connects the two sections of the central tube by a connector after cutting, so that a gap is formed between the two sections of the central tube, thereby effectively forming an effective separation cavity between the first and second filter elements, so that the raw water in the first filter element can enter the separation cavity after being filtered. Then it enters the second filter element for filtration, effectively forming a stage-type filtration effect. Compared with the original technology, there is no need to reserve a certain length of membrane between the two filter element membranes and cut to form an interval cavity. The cut membrane area is greatly reduced, which improves the utilization rate of the membrane and greatly increases the adaptability to situations such as winding deviation. It effectively reduces the scrap rate of the filter element in the process of manufacturing the stage-type filter element by processes such as membrane rolling, membrane repair, and gluing (especially reducing the scrap rate of membranes, membrane belts, etc. in the membrane repair process). While improving the utilization rate of the membrane, it can also effectively reduce the scrap rate of the filter element.

[0045] In order to solve the problem of large volume of the staged filter element technology in which multiple filter elements are connected in series, the present invention provides a staged filter roll membrane filter element structure which shares a central tube in the manufacturing stage and is connected into a whole after the manufacturing is completed. The filter element has the characteristics of high membrane surface flow rate and limited scaling on the membrane surface, which can achieve a long life of the filter element to a certain extent, avoid the problem of chemical release that may exist in chemical scale inhibitors, and the volume problem caused by the connection of multiple filter elements in series.

[0046] The core invention of the present invention is: first roll and then cut, and after the diaphragm is cut off, the center tube is cut off as a whole. Compared with the existing method of not cutting the center tube, it is necessary to reserve space for the diaphragm to form a cavity between the filter elements. The diaphragm area is cut too large, the diaphragm utilization rate is low, and there is often a situation where the diaphragm is scrapped due to rolling deviation. The present invention directly cuts the diaphragm and the center tube, and there is no need to cut off a part of the diaphragm to form a cavity, thereby increasing the utilization rate of the membrane area, and increasing the adaptability to rolling deviation, thereby reducing the scrap rate.

[0047] Furthermore, compared with the prior art, the present invention only requires one segment separation glue line.

[0048] Traditional staged filter element technology uses multiple filter elements connected in series. Taking a one-stage two-stage filter element as an example, the problems it has include:

[0049] 1) The two-stage filter element is manufactured separately. The manufacturing process includes cutting, film rolling, film repair, etc., which is time-consuming.

[0050] 2) Each of the two filter elements uses a supporting central tube, which uses more material;

[0051] 3) To achieve the staged filtration function of two filter elements, the following approaches are adopted: a. Each filter element uses a membrane shell. The number of membrane shells is large, the volume of the whole machine is large, and the number of connecting pipes between the inlet and outlet of the filter element increases, which reduces the reliability; b. Two filter elements are installed in series on a membrane shell. The membrane shell is too long, which is not conducive to the design of the whole machine; c. The two filter elements are made separately. Each filter element has two rubber lines along the direction of the center tube, and the two filter elements have four rubber lines. The rubber lines occupy a large membrane area and the membrane utilization rate is low. In order to achieve the performance indicators, the membrane area needs to be increased.

[0052] The aforementioned problems with the filter element in achieving the staged filtration function are well solved by the staged filter element technology of the present invention. Taking a one-stage two-stage filter element as an example, the specific features and beneficial effects are as follows:

[0053] 1) Synchronous filter element rolling. The membrane, center tube and other materials used in the two-stage filter element rolling process are shared and can be formed in one step. The beneficial effect is that it can save the two separate filter element rolling processes of two separate cutting and rolling, and the process time is shortened;

[0054] 2) Less membrane usage. The two-stage filter element shares a central tube. To achieve the stage function, only one glue line is required in the middle of the membrane. Only three glue lines are required perpendicular to the central tube. The glue occupies less membrane area and the membrane usage can be reduced.

[0055] 3) Install the filter element into a common filter bottle. After the two-stage filter element is rolled, the filter element is physically divided into two sections by trimming the membrane and connecting them with connectors. The overall length of the filter element remains unchanged and can be installed in a single membrane shell. This has the beneficial effects of reducing the number of filter bottles used, simplifying pipe connections, increasing reliability, and miniaturizing the design.

[0056] 4) Water quality safety. Compared with the filter element technology that uses scale inhibitors to achieve high recovery rates, the segmented filter element technology does not have the health and safety issues caused by the release of scale inhibitors;

[0057] 5) Filter life. Compared to single filter elements that achieve high water production rates simply by increasing recovery rates, segmented filter elements have different proportions. The flow rate at the water inlet membrane of the second filter element can be adjusted. At the same time, the cavity area between the segments and the driving force of the water flow can limit scaling, effectively extending the service life of the filter element.

[0058] The present invention provides an integrated rolled membrane filter element with a staged filtration function, and its inventive points include: 1) the two-stage filter element is made of the same center tube, membrane and other materials, and is rolled into a one-time molding; 2) the core points of realizing the staged filtration function include gluing to separate the water channel and repairing the membrane to realize the physical separation of the two-stage filter element, and then the two-stage filter element is re-made into a whole through the connecting piece, which has the staged filtration function; 3) the synchronous manufacturing feature means that when manufacturing the filter element, only three glue lines are required for the two-stage filter element perpendicular to the center tube, and the glue lines occupy a low membrane area and the membrane The usage can be reduced or the membrane utilization rate can be improved; 4) The filter element membrane repair process includes the step of cutting the filter element into two physical sections along the rubber line separating the sections. The advantage of the middle cutting is that the rubber line cut by a single knife is used for both sections of the filter element, without waste, which can improve the filter element qualification rate during the membrane repair process (mentioned later); 5) After the two sections of the filter element are connected, a cavity area is reserved between the sections, so that the filter element has the feature of limiting the scale formation on the membrane surface; at the same time, the ratio of the two sections of the filter element is adjusted to adjust the membrane surface flow rate of the water inlet end face of the second section of the filter element 22, and the combined effect can achieve a long service life of the filter element. Compared with the existing multi-section filter element connected in series to achieve the staged filtration function, the staged filter element provided by the present invention is synchronously formed and installed in a single membrane shell, which saves labor time and volume.

[0059] The main difference between the present invention and the prior art lies in the membrane repair stage and when the filter element is in use. When repairing the membrane in this solution, the two sections of the filter element are cut off together with the membrane and the center tube at the rubber line separating the two sections of the filter element. After cutting, the two sections of the filter element are divided into two, and then connected as a whole using a double-headed connector. When repairing the membrane in the previous solution, a gap needs to be cut around the rubber line separating the two sections of the filter element (completed with two cuts), and the center tube is not cut, that is, after the membrane is repaired, the two sections of the filter element are still on the same center tube. Compared with the previous solution, the advantage is that no gap needs to be reserved when repairing the membrane, the glue width does not be occupied, and the qualified rate of membrane repair can be improved.

[0060] In some embodiments, the diaphragm 2 is folded to form two opposite front sides and two opposite back sides, a raw water flow channel is formed between the two opposite front sides, and a pure water flow channel is formed between the adjacent back sides; the inter-segment separation glue line 31 is arranged on the back side of the folded diaphragm 2 to seal and separate the pure water flow channels of the two filter elements; 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, and 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; so that the raw water can enter and pass through the first raw water flow channel and the second raw water flow channel in sequence for filtration.

[0061] This is the preferred structural form of the two stage-type filter elements formed by the membrane of the present invention, as well as the preferred relationship between the pure water flow channel, raw water flow channel and inter-segment separation rubber line of the two stage-type filter elements, that is, during the membrane repair process, the first and second stage filter elements are formed by cutting from the inter-segment separation rubber line. The purpose of the inter-segment separation rubber line is not only to cut and split at this location, but also to effectively seal the first pure water flow channel and the second pure water flow channel respectively, that is, the remaining inter-segment separation rubber line after cutting can achieve the above-mentioned sealing effect. The outlet of the first raw water flow channel of the first stage filter element is connected to the inlet of the second raw water flow channel of the second stage filter element, which can enable the raw water to enter the second raw water flow channel again for filtration and purification after being filtered by the first stage filter element, forming at least two-stage stage-type filter elements, improving the water purification rate while forming a spacing cavity between the two stages of the filter element. The spacing cavity can increase the water flow rate, thereby reducing the generation of scale, reducing concentration polarization, and increasing the service life of the filter element.

[0062] In some embodiments, the diaphragm 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 toward the center tube 1 (that is, the folded edge is in contact with or close to the center tube, as opposed to rolling the open end toward the center tube). 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. One end of the inter-segment separation rubber line 31 extends to connect with the folded edge 25. During the membrane repair process, the inter-segment separation rubber line 31 is cut from the middle to form an inter-segment separation rubber line 1 located on the first-segment filter element 21 and an inter-segment separation rubber line 2 located on the second-segment filter element 22.

[0063] The rubber line 3 also includes a filter element first rubber line provided on the back of the first filter element 21. The filter element first rubber line and the inter-segment separation rubber line 1 form the first pure water flow channel, and the opening of the first pure water flow channel faces the folded edge 25.

[0064] The rubber line 3 also includes a second filter element rubber line arranged on the back of the second filter element 22. The second filter element rubber line and the inter-segment separation rubber line form the second pure water flow channel, and the opening of the second pure water flow channel faces the folded edge 25.

[0065] This is the preferred folding method before rolling and the preferred cutting method after rolling of the diaphragm of the present invention. The folded edge formed by folding fits with the central tube, which enables raw water to enter the raw water flow channel on the front of the diaphragm, penetrate through the diaphragm to the pure water flow channel on the back to form pure water, and enter the interior of the central tube at the folded edge; and the role of the inter-segment separation glue line here is not only used to cut at this position to separate the first and second sections of the filter element, but also to leave the remaining inter-segment separation glue line 1 and inter-segment separation glue line 2 on the first and second sections of the filter element after cutting to seal the first and second pure water flow channels respectively, and effectively guide the pure water toward the central tube at the folded edge, which not only improves the membrane utilization rate and reduces the cutting area of ​​the diaphragm, but also ensures effective sealing of the two pure water flow channels, is more adaptable to situations such as rolling deviation during the rolling process, and reduces the scrap rate of the filter element.

[0066] In some embodiments, the filter element first rubber line includes a filter element first rubber line 32 and a filter element first rubber line 33. The filter element first rubber line 32 is arranged relative to the second long side and close to the first long side. The filter element first rubber line 33 is arranged relative to the folded edge 25 and close to the open end 26. The filter element first rubber line 32 extends from the folded edge 25 to connect with the filter element first rubber line 33. One end of the filter element first rubber line 33 is connected to the filter element first rubber line 32, and the other end is connected to the inter-segment separation rubber line 1.

[0067] The filter element second rubber line includes a filter element second rubber line 1 34 and a filter element second rubber line 2 35. The filter element second rubber line 1 34 is arranged relative to the first long side and close to the second long side. The filter element second rubber line 2 35 is arranged relative to the folded edge 25 and close to the open end 26. The filter element second rubber line 1 34 extends from the folded edge 25 to connect with the filter element second rubber line 2 35. One end of the filter element second rubber line 2 35 is connected to the filter element second rubber line 1 34, and the other end is connected to the inter-segment separation rubber line 2.

[0068] This is the preferred structural form of the filter element one rubber line on the first section filter element of the present invention and the preferred structural form of the filter element two rubber line on the second section filter element. The filter element one rubber line can extend in the long side direction of the first section filter element and seal the pure water to prevent the raw water inlet from entering the first pure water flow channel. The filter element one rubber line can extend at the open end of the first section filter element and seal the pure water there to prevent the pure water in the pure water flow channel from mixing with the raw water outside the open end. The filter element one rubber line, the filter element one rubber line and the segment separation rubber line are composed as shown in FIG. Figure 6 The U-shaped sealing structure shown is used to effectively guide the water in the first pure water flow channel to the folded edge and enter the central tube; the second rubber line 1 of the filter element can extend in the long side direction of the second filter element and seal the pure water to prevent the pure water in the second pure water flow channel from flowing out below; the second rubber line 2 of the filter element can extend at the open end of the second filter element and seal the pure water there to prevent the pure water in the pure water flow channel from mixing with the raw water outside the open end. The second rubber line 1 of the filter element, the second rubber line 2 of the filter element and the segment separation rubber line are composed as shown in FIG. Figure 6 The U-shaped sealing structure shown is used to effectively guide the water in the second pure water flow channel to the folded edge and enter the central tube.

[0069] In some embodiments, within the plane in which the diaphragm 2 is unfolded, the filter element one rubber line 32, the inter-segment separation rubber line 31, and the filter element two rubber line 34 are all arranged in parallel and perpendicular to the central axis of the central tube 1. The filter element one rubber line 33 and the filter element two rubber line 35 are located on the same straight line and parallel to the central axis of the central tube 1. This is the preferred positional relationship of the filter element one rubber line 1, the inter-segment separation rubber line, and the filter element two rubber line 1 of the present invention, that is, the three are preferably arranged in parallel, all connected and extended from the folded edge, and can all perform a sealing function on the inlet end of the first filter element, between the first and second filter elements, and the outlet section of the second filter element. The filter element one rubber line 2 and the filter element two rubber line 2 are connected in a straight line and are parallel to the central tube axis, and can respectively perform a pure water sealing function on the opening ends of the first and second filter elements.

[0070] The filter element 1 glue line 1, the filter element 1 glue line 2 and the filter element 2 glue line 1, the filter element 2 glue line 2 are preferably made of glue as a whole, forming Figure 6 The U-shaped structure shown forms an effective seal between the pure water flow channel and the outside world.

[0071] In some embodiments, during the membrane repair process, the first and second rubber lines 32 and 33 of the filter element are cut and trimmed sequentially or simultaneously, and the first and second rubber lines 34 and 35 of the filter element are cut and trimmed sequentially or simultaneously. In addition to cutting and trimming the rubber lines separating the segments, the membrane repair process of the present invention can also simultaneously or asynchronously trim the rubber lines at both ends and the rubber line at the opening, so that the repaired membrane can be rolled onto the central tube to form an integrated filter element structure.

[0072] In some embodiments, after the diaphragm 2 is rolled onto the central tube 1 and before the diaphragm 2 is trimmed, a glue curing step is further performed. After the glue line is set and lasts for a preset time, the rolled diaphragm 2 is trimmed. By providing a glue curing step between the glue application step and the trimming step, the present invention can effectively cure the glue line on the glued diaphragm, especially bonding the diaphragms on the back side together, achieving an effective sealing effect before the trimming is performed, effectively sealing the pure water flow channel, and preventing the occurrence of leakage due to the glue not curing during the trimming process, resulting in a poor seal of the pure water flow channel.

[0073] In some embodiments, the central tube 1 is provided with a first pure water diversion hole 11 and a second pure water diversion hole 12. Both the first pure water diversion hole 11 and the second pure water diversion hole 12 extend from the outer wall to the inner wall of the central tube 1. The first pure water diversion hole 11 is opposite to the first filter element 21, and the second pure water diversion hole 12 is opposite to the second filter element 22. The first pure water flow channel is connected to the first pure water diversion hole 11, and the second pure water flow channel is connected to the second pure water diversion hole 12. The central tube of the present invention is provided with a first pure water diversion hole 1 and a second pure water diversion hole 2, respectively, which can be connected to the first and second pure water flow channels to guide pure water into the central tube and discharge it to a desired location in the central tube as a whole.

[0074] In some embodiments, along the axis of the central tube 1, the spacing between the closest pure water diversion hole 11 and the closest pure water diversion hole 2 12 is greater than or equal to twice the width of the inter-segment separation rubber line 31. The present invention provides a spacing between the closest pure water diversion hole 1 and the closest pure water diversion hole 2 that is greater than or equal to twice the width of the inter-segment separation rubber line. This allows the pure water diversion hole 1 and the pure water diversion hole 2 to be located on either side of the inter-segment separation rubber line, preventing the pure water from being unable to receive pure water due to being opposite the inter-segment separation rubber line. This ensures the sealing of the pure water within the central tube and prevents leakage of the pure water or mixing with concentrated water.

[0075] The filter element of the present invention comprises a central tube 1, a first filter element 21 and a second filter element 22 wound on the central tube. Figure 5), including pure water diversion hole 11 and pure water diversion hole 2 12. Pure water diversion hole 11 is mainly used to collect pure water from the first filter section, and pure water diversion hole 2 is mainly used to collect pure water from the second filter section. The number of openings of the two parts of pure water diversion hole is ≥ 2. The adjacent openings of pure water diversion hole 11 and pure water diversion hole 2 12 need to be separated by a certain distance, and the distance needs to be greater than 2 times the width of the separating rubber line between the sections. It also includes a water baffle 15 for separating pure water from raw water; groove 3 16 for installing an O-ring; and a pure water outlet 17 for diverting the collected pure water. The first filter section 21 covers the pure water diversion hole 11 of the central tube; the second filter section 22 covers the pure water diversion hole 2 12 of the central tube 1.

[0076] In some embodiments, the central tube 1 is cut into a first central tube segment 13 and a second central tube segment 14 when the membrane is repaired, and the connecting member 4 is disposed between the first central tube segment 13 and the second central tube segment 14 and connects the first central tube segment 13 and the second central tube segment 14 into one piece;

[0077] The first central tube segment 13 and the second central tube segment 14 are spaced apart from each other, and the connecting member 4 includes a connecting body 41 and a protrusion 42. The protrusion 42 is arranged on the outer peripheral wall of the connecting body 41 and protrudes outward. The protrusion 42 is clamped at the spaced position between the first central tube segment 13 and the second central tube segment 14.

[0078] This is the preferred form of cooperation between the two central pipe sections and the connecting piece of the present invention. Since the connecting body adopts a raised structure, it can effectively separate the two central pipe sections and form a spacing position, thereby separating the two filter elements rolled on the two central pipe sections into a cavity, so that the water flowing out of the first raw water flow channel first enters the cavity and then enters the second raw water flow channel, thereby increasing the raw water flow rate, reducing concentration polarization, reducing water scaling, and increasing the service life of the filter element.

[0079] In some embodiments, the connecting body 41 is a tubular structure (preferably a cylindrical tube), and the protrusion 42 divides the connecting body 41 into a connecting body 1 and a connecting body 2. The connecting body 1 is located on one axial side of the protrusion 42, and the connecting body 2 is located on the other axial side of the protrusion 42. The connecting body 1 is inserted into the first central tube segment 13, and the connecting body 2 is inserted into the second central tube segment 14.

[0080] And / or, the protrusion 42 is an annular structure or a plurality of structures arranged at intervals on the outer peripheral wall of the connecting body 41 , and the outer diameter of the protrusion 42 is flush with the outer diameter of the central tube 1 .

[0081] This is a further preferred structural form of the connecting body and the protrusion of the present invention. The protrusion divides the connecting body into two parts, one part is inserted into the first central pipe segment, and the other part is inserted into the second central pipe segment, which effectively improves the bonding strength between the two central pipe segments; and the protrusion is preferably an annular structure or a plurality of block structures spaced apart in the circumferential direction. The outer diameter of the protrusion is flush with the outer diameter of the central pipe, so that the protrusion does not affect the cavity part, thereby ensuring the increase in the raw water flow rate and improving the anti-scaling effect.

[0082] There is also a double-ended connector between the first filter element 21 and the second filter element 22 ( Figure 4 ) is used to connect the first filter element 21 and the second filter element 22 formed after membrane repair to form a single unit, a key component for achieving staged filtration between the two filter elements. Specifically, it includes a raised feature with an outer diameter identical to that of the center tube; a groove 43 is used to mount an O-ring, which is installed in the corresponding center tube cavity.

[0083] In some embodiments, after the central tube 1 is cut and the connector 4 is installed between the first central tube segment 13 and the second central tube segment 14, the first filter element 21 and the second filter element 22 are spaced apart to form a cavity 5, and a water sealing member 61 is installed at the periphery of the cavity 5 to seal the cavity 5 relative to its periphery. This is the preferred structural form after the membrane is cut in the present invention, that is, the first and second central tube segments are effectively separated by the protrusion of the connecting body, thereby forming a separated cavity between the first and second filter elements, allowing raw water to enter the cavity first and then enter the second raw water flow channel, thereby increasing the raw water flow rate, preventing scaling, and increasing the service life of the filter element. The water sealing member can effectively seal the cavity position.

[0084] Water sealing parts ( Figure 3a-Figure 3b), comprising a water sealing member 1 61 and a water sealing member 2 62. The water sealing member 1 61 primarily separates the concentrated water outlet of the first-stage filter element 21 and the raw water inlet of the second-stage filter element 22 from the raw water inlet of the first-stage filter element 21, thereby preventing the raw water of the first-stage filter element 21 from mixing with other water. It is installed at the junction of the first-stage filter element 21 and the second-stage filter element 22. The water sealing member 1 61 includes a positioning post 611, which is inserted into the gap between the first-stage filter element 21 and the second-stage filter element 22; an adhesive surface 1 613, which is primarily used to achieve a tight connection with the first-stage filter element 21 and the second-stage filter element 22; and ribs 612, which are used to form a water flow channel with the inner wall of the filter bottle body and simultaneously contact the inner wall surface to center the entire filter element. The second water sealing component 62 is mainly used to separate the concentrated water outlet of the second-stage filter element 22 from the raw water inlet water channel of the first-stage filter element 21. It is installed at the concentrated water outlet end of the second-stage filter element 22. The first rib 621 is located on the inner wall, and is used to form a flow channel with the second-stage filter element 22 near the concentrated water outlet end face to discharge the concentrated water in time; the second rib 622 forms a water flow channel with the inner wall of the filter bottle, and at the same time centers the filter element; the second groove 623 is used to install the sealing ring, which is squeezed against the first surface of the filter bottle body 7 to achieve sealing; the water outlet is used to guide the concentrated water out of the second-stage filter element 22; the second adhesive surface 624 is used to achieve sealing and fastening connection with the second-stage filter element 22 through tape bonding.

[0085] The present invention also provides a water purifier, which includes the aforementioned integrated rolled membrane filter element with staged filtration function.

[0086] Figure 6 This is the method used to arrange the glue lines during the winding of the filter element. The first and second filter sections 21 and 22 share a common separating glue line 31, located directly between the adjacent holes 11 and 12 of the central tube's pure water diversion hole. The initial filter element is formed by placing the membrane and mesh as needed and then winding it up. After the glue solidifies, the filter element needs to be trimmed to remove any excess glue that blocks the inlet and outlet water passages. (When trimming the membrane, some of the glue line is removed to leave a channel; the remaining glue line serves as a seal.)

[0087] Figure 7The trimming of the filter element and the connection of the two filter elements after trimming. Trimming includes two steps. The first step is to use knife 1 and knife 2 to trim the two ends of the filter element to remove the excess glue from the water inlet end face of the first filter element 21 and the water outlet end face of the second filter element 22; the second step is to cut the filter element according to the position of the glue line between the segments, so that the filter element is divided into two, forming two physical filter elements; after the filter element is trimmed, the first filter element 21 and the second filter element 22 need to be connected through a double-head connector, and the sealing parts of the double-head connector are inserted into the center pipe at the connection between the first filter element 21 and the second filter element 22. The inner wall realizes the water channel sealing. At the same time, the raised feature of the double-head sealing connector forms a cavity 5 between the first filter element 21 and the second filter element 22. The cavity is a necessary feature. Its function is to make the membrane surface scaling component state and limit the membrane surface scaling area. At the same time, the concentrated water outlet of the first filter element 21 is collected and gathered together and then merged into the water inlet end face of the second filter element 22, which can increase the membrane surface flow rate of the second filter element 22 at the water inlet end face (the ratio of the first filter element 21 and the second filter element 22 can change the membrane surface flow rate of the second filter element 22 at the water inlet end face. The second filter Because there is a gap at the water inlet end of the core, the concentrated water of the first section is collected first. At the same time, there is a rubber line of a certain width at the water inlet end of the second filter element, so the collected water is not lost along the way. Compared with the uniform discharge of the traditional filter element, the water flow rate increases when the collected water enters the second filter element again, and the flow rate is equal to the flow rate divided by the area, so the membrane surface flow rate increases; on the other hand, the cavity can increase the flow rate due to the reduction of the flow area in the process of entering the second raw water flow channel, thereby effectively preventing scaling). The two combined effects can extend the life of the filter element (membrane surface flow rate, membrane surface scaling limit; membrane surface As the flow rate increases, the flushing force on the membrane surface is enhanced, which can effectively slow down the scaling rate and thus increase the life of the filter element). The principle of scaling confinement on the membrane surface is that, compared with the first filter element 21 and the second filter element 22 having no cavity connection, the tiny crystals in the concentrated water have no attachment carrier in the cavity area after the cavity is formed. At the same time, the water flows from the first filter element 21 to the second filter element 22. Therefore, under the conditions of water flow driving force and the second filter element 22 as an attachment carrier, the scaling area of ​​the tiny crystals is limited to the membrane surface of the second filter element 22. The tiny crystals aggregate to form large particles, which are scale. Scaling requires crystal particles to cluster and have attachments. For the filter element of the present invention, the existence of the gap between the two filter elements means that the tiny crystals have no attachments in this part. At the same time, driven by the water flow direction and the large flow rate on the membrane surface of the water inlet of the second filter element, scaling is mainly limited to the second filter element. During the life of the filter element, the scale of the optimized stage filter element is mainly in the second filter element.

[0088] 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. An integrated spiral membrane filter element with staged filtration function, characterized by: include: A central tube (1), a diaphragm (2), a rubber line (3) and a connecting piece (4), wherein the diaphragm (2) is an integral diaphragm and is rolled on the outer periphery of the central tube (1); along the axial direction of the central tube (1), the diaphragm (2) includes an axial first end (23) and an axial second end (24); and the rubber line (3) includes a segment separation rubber line (31) provided between the axial first end (23) and the axial second end (24) before rolling, so as to separate the diaphragm (2) into a first segment filter element (21) and a second segment filter element (22) of a staged type; (2) After being rolled onto the central tube (1), the membrane is trimmed along the direction of the inter-segment separation rubber line (31) to separate the first segment filter element (21) and the second segment filter element (22), and the central tube (1) is further cut radially inward. The two segments of the central tube (1) after being cut are connected by a connector (4) to form a gap. During the trimming process, the inter-segment separation rubber line (31) is cut from the middle to form an inter-segment separation rubber line 1 located on the first segment filter element (21) and an inter-segment separation rubber line 2 located on the second segment filter element (22).

2. The integrated spiral membrane filter element with staged filtration function according to claim 1, characterized in that: The diaphragm (2) is folded to form two opposite front sides and two opposite back sides, a raw water flow channel is formed between the two opposite front sides, and a pure water flow channel is formed between the adjacent back sides; the inter-segment separation rubber line (31) is arranged on the back side of the folded diaphragm (2) to seal and separate the pure water flow channels of the two filter elements; the first 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 filter element (21); the second 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 filter element (22); the outlet of the first raw water flow channel is connected to the inlet of the second raw water flow channel.

3. The integrated spiral membrane filter element with staged filtration function according to claim 2, characterized in that: The diaphragm (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 toward the central tube (1), the first long side is located at the first axial end (23), the second long side is located at the second axial end (24), and one end of the segment separation glue line (31) extends to connect with the folded edge (25); The glue line (3) further includes a filter element first glue line provided on the back of the first filter element (21), the filter element first glue line and the inter-segment separation glue line forming the first pure water flow channel, and the opening of the first pure water flow channel faces the folded edge (25); The rubber line (3) also includes a second filter element rubber line arranged on the back of the second filter element (22), the second filter element rubber line and the inter-segment separation rubber line form the second pure water flow channel, and the opening of the second pure water flow channel faces the folded edge (25).

4. The integrated spiral membrane filter element with staged filtration function according to claim 3, characterized in that: The filter element one rubber line includes a filter element one rubber line one (32) and a filter element one rubber line two (33), the filter element one rubber line one (32) is arranged at a position relative to the second long side and close to the first long side, the filter element one rubber line two (33) is arranged at a position relative to the folding edge (25) and close to the opening end (26), the filter element one rubber line one (32) extends from the folding edge (25) to connect with the filter element one rubber line two (33), one end of the filter element one rubber line two (33) is connected to the filter element one rubber line one (32), and the other end is connected to the segment separation rubber line one; The filter element second rubber line includes a filter element second rubber line one (34) and a filter element second rubber line two (35). The filter element second rubber line one (34) is arranged relative to the first long side and close to the second long side. The filter element second rubber line two (35) is arranged relative to the folding edge (25) and close to the opening end (26). The filter element second rubber line one (34) extends from the folding edge (25) to connect with the filter element second rubber line two (35). One end of the filter element second rubber line two (35) is connected to the filter element second rubber line one (34), and the other end is connected to the segment separation rubber line two.

5. The integrated spiral membrane filter element with staged filtration function according to claim 4, characterized in that: In the plane where the diaphragm (2) is unfolded, the filter element one rubber line one (32), the segment separation rubber line (31) and the filter element two rubber line one (34) are all arranged in parallel and are perpendicular to the central axis of the central tube (1); the filter element one rubber line two (33) and the filter element two rubber line two (35) are located on the same straight line and are parallel to the central axis of the central tube (1).

6. The integrated spiral membrane filter element with staged filtration function according to claim 4, characterized in that: During the membrane repair process, the filter element one glue line one (32) and the filter element one glue line two (33) are repaired and cut in sequence or simultaneously, and the filter element two glue line one (34) and the filter element two glue line two (35) are repaired and cut in sequence or simultaneously; and / or, After the diaphragm (2) is rolled onto the central tube (1), and before the diaphragm (2) is repaired, a glue curing step is further provided. After the glue line is set and lasts for a preset time, the rolled diaphragm (2) is repaired.

7. The integrated spiral membrane filter element with staged filtration function according to claim 2, characterized in that: The central tube (1) is provided with a pure water guide hole 1 (11) and a pure water guide hole 2 (12). The pure water guide hole 1 (11) and the pure water guide hole 2 (12) both penetrate from the outer wall to the inner wall of the central tube (1). The pure water guide hole 1 (11) is opposite to the first filter element (21), and the pure water guide hole 2 (12) is opposite to the second filter element (22). The first pure water flow channel is connected to the pure water guide hole 1 (11), and the second pure water flow channel is connected to the pure water guide hole 2 (12).

8. The integrated spiral membrane filter element with staged filtration function according to claim 7, characterized in that: Along the axial direction of the central tube (1), the spacing distance between the closest pure water guide hole 1 (11) and the closest pure water guide hole 2 (12) is more than twice the width of the inter-segment separation rubber line (31).

9. The integrated spiral membrane filter element with staged filtration function according to any one of claims 1 to 8, characterized in that: The central tube (1) is cut into a first central tube segment (13) and a second central tube segment (14) when the membrane is repaired, and the connecting member (4) is arranged between the first central tube segment (13) and the second central tube segment (14) and connects the first central tube segment (13) and the second central tube segment (14) into one body; The first central tube segment (13) and the second central tube segment (14) are spaced apart from each other, and the connecting member (4) comprises a connecting body (41) and a protrusion (42). The protrusion (42) is arranged on the outer peripheral wall of the connecting body (41) and protrudes outward, and the protrusion (42) is clamped at the spaced position between the first central tube segment (13) and the second central tube segment (14).

10. The integrated spiral membrane filter element with staged filtration function according to claim 9, characterized in that: The connecting body (41) is a cylindrical structure, and the protrusion (42) divides the connecting body (41) into a connecting body 1 and a connecting body 2. The connecting body 1 is located on one axial side of the protrusion (42), and the connecting body 2 is located on the other axial side of the protrusion (42). The connecting body 1 is inserted into the first central pipe section (13), and the connecting body 2 is inserted into the second central pipe section (14). And / or, the protrusion (42) is an annular structure or a plurality of spaced structures arranged on the outer peripheral wall of the connecting body (41), and the outer diameter of the protrusion (42) is flush with the outer diameter of the central tube (1).

11. The integrated spiral membrane filter element with staged filtration function according to claim 9, characterized in that: After the central tube (1) is cut and the connecting piece (4) is arranged between the first central tube section (13) and the second central tube section (14), the first filter element (21) and the second filter element (22) are spaced apart to form a cavity (5), and a water sealing piece (61) is provided at the periphery of the cavity (5) to seal the cavity (5) relative to its periphery.

12. A water purifier, characterized in that: The invention comprises an integrated roll-type membrane filter element with a staged filtration function according to any one of claims 1 to 11.

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