WO2023246738A1

WO2023246738A1 - End surface confluence-type filter element assembly and filter element

Info

Publication number: WO2023246738A1
Application number: PCT/CN2023/101260
Authority: WO
Inventors: 王小侠
Original assignee: 杭州苏博瑞驰科技有限公司
Priority date: 2022-06-21
Filing date: 2023-06-20
Publication date: 2023-12-28
Also published as: CN220159665U; CN114849482A; CN219784377U

Abstract

An end surface confluence-type filter element assembly and a filter element, relating to the technical field of water purification. In the filter element assembly, a membrane bag (1) is wound on a central tube (2) along the extension direction of a first long edge (101); the membrane bag (1) is formed by folding a thin basic membrane (100) along the first long edge (101), a first end cap (4) is mounted at a pure water outlet end of a membrane element, and a package portion (41) of the first end cap (4) is sleeved on the periphery of the membrane element; a support portion (401) is provided in the inner cavity of the first end cap (4) and used for supporting the first long edge (101) of the thin basic membrane (100), a flow guide water channel (402) is formed on the support portion (401) and used for discharging pure water. Because the thin basic membrane (100) is made of a soft material and has a small thickness, and the support portion (401) and the flow guide water channel (402) are provided, it is ensured that the membrane element using the folding scheme can have a long service life, the pure water flow channel is shortened, and the pure water production efficiency is improved.

Description

End-face converging filter element components and filter elements

Technical field

The present invention relates to the technical field of water purification, and more specifically, to an end-face convergence type filter element assembly and a filter element.

Background technique

With the improvement of people's living standards, the quality of drinking water is becoming increasingly important. As a household water purification equipment, the core component of a water purifier is the filter element, which mainly includes membrane elements and membrane casings. The more critical ones are the diaphragm, as well as the raw water channel and pure water channel set on both sides of the diaphragm.

During use, raw water flows in from the raw water channel, becomes pure water after being filtered by the reverse osmosis of the membrane, and flows out from the pure water channel. Due to the rolled membrane structure, the pure water channel is longer. The following problems exist:

If the pure water channel is too long, the water will encounter greater resistance when passing through, resulting in increased flow rate loss and a natural decrease in the amount of pure water produced per unit time, which directly affects the water production efficiency of the water purifier. The flow channel is longer, the inner surface area is increased, and sediments are more likely to accumulate, which can easily cause blockage during use and increase the difficulty of maintenance.

For example, among the already disclosed solutions, the patent CN201810506458.2 discloses a filter element solution. By setting the thickness of the raw water diversion net and the pure water diversion net to be distributed in a gradient along the direction of the flow channel, the drainage linear speed of the concentrated water end is increased to avoid The membrane element is clogged. However, this solution has a long pure water channel, resulting in a large pressure loss, and it is difficult to increase the water production per unit time.

When designing the membrane element of the water purifier, you should consider setting the pure water channel to an appropriate length, which can not only ensure a certain amount of water production, but also avoid the occurrence or impact of the above problems to the greatest extent, so as to obtain higher use effects. and economic benefits. The optimized design of the pure water channel is the key to improving the overall performance of the water purifier.

Contents of the invention

1. The technical problem to be solved by the invention

Based on the analysis of existing technologies and invention patents, this invention aims at the technical defect of the existing pure water channel being too long. It combines a thin base diaphragm and adopts a long-side folding method to realize the design of a short channel for pure water. This new structure It can better balance flow rate and pressure drop, improve water production efficiency and operating performance, and has high practical value.

2.Technical solutions

In order to achieve the above objects, the technical solutions provided by the present invention are:

An end-flow type filter element assembly of the present invention includes a central tube and a membrane element. The membrane element has at least one membrane bag. The membrane bag has opposite first long sides and second long sides, and opposite first short sides and On the second short side, the film bag is wrapped around the central tube along the extending direction of the first long side;

The membrane bag is formed by folding a thin base membrane sheet along the first long side. The opposite inner side of the membrane bag is the raw water side, and the outer side is the pure water side; a raw water diversion net is provided on the raw water side, and a raw water diversion net is provided on the pure water side. Pure water diversion cloth; when filtering, the water flow can enter from the raw water The water inlet enters the raw water side, and the pure water formed by passing through the thin base diaphragm flows in the direction of the first long side, and flows out from the pure water outlet end where the first long side is located;

The pure water outlet end of the membrane element is equipped with a first end cap, and the packaging part of the first end cap is sleeved on the outer periphery of the membrane element; the inner cavity of the first end cap has a support part for supporting the thin substrate. The first long side of the diaphragm is formed with a drainage channel on the support part for discharging pure water;

The other end of the membrane element is covered with a second end cap. The inner end face of the second end cap is at least partially sealed with the end face of the membrane element. The central tube penetrates the inner end face of the second end cap.

Further, the stiffness of the thin base film is 2.0-4.2cm, and the surface of the rolled film bag is a generally flat curved surface;

Or: the thickness of the thin base diaphragm is 0.008~0.09mm, and the softness is 2.0~30.0g, so that it can eliminate the wrinkles formed at the first long side when rolling the film; the stiffness of the thin base diaphragm is 2.0~4.2cm, the surface of the rolled film bag is a roughly flat curved surface.

Further, on the pure water side of the membrane bag, a sealing structure is formed along the first short side, the second short side and the second long side.

Further, at the pure water outlet end of the membrane element, its outer edge is glued and sealed with the first end cap.

Further, a glue groove is provided at the edge of the support part, and the glue groove is recessed relative to the surface of the support part; the glue groove is filled with sealant.

Further, a manifold chamber is provided in the first end cover, which is arranged around the central tube and connected with the drainage water channel, and pure water is discharged through the manifold chamber.

Further, the central tube has a hollow pure water chamber, and a guide hole is provided on the side wall of the central tube. The guide hole connects the manifold chamber and the pure water chamber; the pure water chamber connects to the end surface of the central tube for discharge. Pure water.

Further, a partition is provided in the central tube. One side of the partition is a pure water chamber and the other side is a water diversion chamber. The partition is close to the pure water outlet end; the side wall of the central tube is provided with a connecting water diversion chamber. Several water diversion holes are connected to the raw water side of the membrane bag.

Further, the support part and the installation part are an integral structure or are arranged separately, and the water diversion channel is a groove structure or a hole structure on the support part.

Further, the first end cap also includes a mounting head, the inner side of the mounting head is connected to the central tube, and the outer wall is provided with a circumferential sealing groove.

Further, it also includes a sealing member, which is annularly sleeved on the outer circumference of the membrane element or the second end cap, or the second end cap.

Further, the sealing member is a Y-shaped sealing ring, the opening of which faces one end of the raw water inlet.

Further, the sealing member is annularly sleeved on the outer periphery of the second end cap, and is provided with a step on the second end cap, and the bottom end of the sealing member is pressed against the step to restrict it from sliding toward the first end cap; or :

The outer periphery of the membrane element is covered with a rubber film, and a number of film holes are opened on the rubber film for water inlet or drainage; a Y-shaped sealing ring is set on the rubber film, and the area between the Y-shaped sealing ring and the second end cover The adhesive film is in a closed state.

Further, both the first end cap and the second end cap are made of non-metallic materials.

Further, a seal is formed at the first long side of the raw water side of the membrane bag, one of the first short side or the second short side is used as the raw water inlet, and the other short side is used as the concentrated water outlet, Or the partially unsealed position on the second long side can be used as the concentrated water outlet.

A filter element of the present application includes the aforementioned filter element assembly and a membrane shell. The filter element assembly is installed in the membrane shell.

Further, the membrane shell includes a shell and a shell cover, and the shell and the shell cover are snap-fitted or threadedly connected.

Further, the end of the housing is provided with a raw water interface and a pure water interface, and a concentrated water interface is provided on the shell cover connected to the other end;

Or: a concentrated water interface and a pure water interface are provided at one end of the shell, and a raw water interface is provided on the shell cover connected to the other end. The central tube has pure water chambers connected to both ends. The pure water at the pure water outlet flows out from the pure water outlet through the pure water chamber.

3. Beneficial effects

Compared with the existing technology, the technical solution provided by the present invention has the following beneficial effects:

In the filter element assembly of the present invention, the membrane bag is formed by folding a thin base membrane sheet along the first long side, forming a certain sealing structure on the pure water side, and winding it along the extending direction of the first long side to form a membrane element. The diaphragm material is soft and thin. In order to ensure its service life, a support part and a drainage channel are provided on the end cover to ensure that the membrane element of this folding scheme has a long service life and achieves a shorter pure water side channel. , improving the efficiency of pure water production.

Description of the drawings

Figure 1 is a schematic structural diagram of an implementation of the filter element assembly;

Figure 2 is a schematic diagram of a folding method of the film bag of the present application;

Figure 3 is a schematic diagram of the unfolded structure of a film bag according to the present application;

Figure 4 is a schematic diagram of pure water diversion net and raw water diversion cloth;

Figure 5 is a schematic diagram of the winding effect after folding the long side of the existing diaphragm;

Figure 6 is a schematic diagram of the winding effect after the long side of the diaphragm of the present application is folded;

Figure 7 is a structural schematic diagram of the first end cap of the present application;

Figure 8 is a schematic cross-sectional structural diagram of the end cap in Figure 7;

Figure 9 is a schematic diagram of an embodiment in which the support part is detachable;

Figure 10 is a schematic diagram of a water inlet and outlet method of the membrane element;

Figure 11 is a schematic diagram of a combination of membrane elements and seals;

Figure 12 is a schematic diagram of a sealing structure implementation of a membrane element;

Figure 13 is a schematic diagram of an embodiment of the filter element;

Figure 14 is a schematic diagram of the seal installed on the end cover;

Figure 15 is a schematic diagram of an embodiment in which the filter element uses the central tube as a water path;

Figure 16 is a schematic diagram of an embodiment in which the filter element uses a central tube to enter water.

Label description in the schematic diagram:
01. Raw water channel; 02. Pure water channel;
1. Membrane bag; 100, thin base diaphragm; 100a, A diaphragm; 100b, B diaphragm; 101, first long side; 102, second long side; 103, first short side; 104, second short side side;
110. Raw water diversion net; 120. Rubber strips; 121. Main rubber strips; 122. Side rubber strips;
2. Central tube; 201. Diversion hole; 202. Partition plate; 203. Water diversion hole; 204. Water diversion cavity;
3. Pure water diversion cloth;
4. First end cover; 401. Support part; 402. Drainage channel; 403. Manifold cavity; 404. Installation cavity; 405. Support platform; 41. Encapsulation part 42. Installation head;
5. Second end cap;
6. Seals;
71. Shell; 72. Shell cover.

Detailed ways

In order to further understand the content of the present invention, the present invention will be described in detail with reference to the accompanying drawings and embodiments.

The structures, proportions, sizes, etc. shown in the drawings of this specification are only used to coordinate with the content disclosed in the specification and are for the understanding and reading of those familiar with this technology. They are not used to limit the conditions under which the present invention can be implemented. Therefore, It has no technical substantive significance. Any structural modifications, changes in proportions or adjustments in size shall still fall within the scope of the technology disclosed in the present invention as long as it does not affect the effectiveness and purpose of the present invention. The content must be within the scope that can be covered. At the same time, terms such as "upper", "lower", "left", "right", "middle", etc. cited in this specification are only for convenience of description and are not used to limit the scope of implementation. Changes or adjustments in relative relationships, provided there is no substantial change in the technical content, shall also be deemed to be within the scope of the present invention.

In response to the problem of long pure water channels in water purification filters, many solutions have been proposed in the industry, but their implementation is relatively complex, or the possibility of implementation is only theoretically possible. In this case, the cross-flow filtration membrane element of the present application is proposed.

With reference to Figures 1 and 2, an end-face converging filter element assembly of this embodiment includes a central tube 2 and a membrane element, wherein, The membrane element includes at least one membrane bag 1. The membrane bag 1 has opposite first long sides 101 and second long sides 102, and opposite first short sides 103 and second short sides 104. The membrane bag 1 is along the first The extending direction of the long side 101 is rolled to form a membrane element. Wherein, if the central tube is placed parallel to the second short side 104, it can be rolled along the extending direction of the first long side 101 to form a membrane element with a central tube. In order to clearly illustrate the structure of the membrane element, this embodiment will be described in combination with the unfolded state or the rolled state of the membrane element, so as to clearly demonstrate the structure of the membrane element.

Referring to Figure 3, the membrane bag 1 is formed by folding a thin base membrane sheet 100 along the first long side 101. The thin base membrane sheet 100 is divided into an A membrane sheet 100a and a B membrane sheet 100b. The opposite inner sides of the membrane bag 1 are raw water. side, the outer side is the pure water side. That is, the opposite side of the A diaphragm 100a and the B diaphragm 100b is the raw water side, and the opposite outer side is the pure water side.

The rolled membrane element has a multi-layer winding structure. Figure 4 shows an unfolded membrane element structure. A raw water diversion net 110 is provided on the raw water side to form a raw water channel 01 so that the raw water can flow around the filter element. Flow from the inner layer to the outer layer or from the outer layer to the inner layer. A pure water guide cloth 3 is provided on the pure water side, and an axial pure water channel 02 is formed on the pure water side. During filtration, the water flows into the raw water side, and the pure water formed by passing through the thin base membrane 100 flows out from the first long side 101 along the pure water channel 02. The end of the first long side is the pure water outlet end. The remaining concentrated water on the raw water side is discharged from the first short side 103 or the second short side 104 along the raw water channel 01.

It is worth noting that the thickness of the thin base film 100 in this embodiment is small, may be less than 0.09 mm, and is thin and soft. Therefore it requires some support. A first end cover 4 is installed at the pure water outlet end of the membrane element. The packaging part 41 of the first end cover 4 is set on the outer periphery of the membrane element; the inner cavity of the first end cover 4 has a support part 401 for supporting the thin film. The first long side 101 of the base membrane 100 has a drainage channel 402 formed on the support portion 401 for discharging pure water.

A second end cover 5 is installed at the other end of the membrane element. The inner end surface of the second end cover 5 is at least partially sealed with the end surface of the membrane element. The central tube 2 penetrates the inner end surface of the second end cover and is used to divert the water flow in the central tube. discharge. The first end cap 4 and the second end cap 5 can both be made of non-metallic materials, such as plastic, formed by casting or compression molding, or made of polymer materials through 3D printing.

As a specific explanation, the thickness of the thin base film 100 may be 0.008-0.09 mm, such as 0.015 mm, 0.025 mm, 0.050 mm, etc. The softness can be controlled to 2.0-40g, so that the wrinkles formed at the first long side 101 when rolling the film can be eliminated, and the filtration work can be performed normally.

Most of the existing diaphragms are thicker than 0.15mm, and their thickness is relatively large. If the long-side folding method of the present application is adopted, the radial size of the rolled membrane element at one end of the first long side will be larger, and the other end will have a larger thickness. There are no folds, the radial size is small, and the overall tapered structure is present. When the short sides are folded, since the folded dimensions are accumulated in the axial direction, and multiple folded sides can be evenly distributed, membrane elements with relatively consistent radial dimensions can be formed.

With reference to Figure 5, after the conventional film is folded on the long side according to the method of the present application, it is also rolled along the long side through the central tube. During winding, the radial circumferences of the inner and outer sides of the film bag are different, and there is also a displacement difference, then Will form more obvious pleats after winding wrinkle. Due to its softness, there will be more sharp corners. These folds and sharp corners will trap dirt and evil during filtration. The service life of the filter element will be short, and it may even fail to meet the standards.

In this application, in order to eliminate or reduce wrinkles caused by such thickness and hardness, the thin base membrane 100 used in this embodiment has certain limits on the softness after thickness, so that the reverse osmosis membrane has better tensile deformation. And compression deformation ability, so that the wrinkles formed at the first long side when rolling the film can be eliminated, and the filtration work can be performed normally. For example, the thickness is further limited to 0.01-0.07mm, and the softness is limited to 2.0-20g. Of course, as some other embodiments, the thickness can be further limited to 0.01-0.04mm, and the softness can be limited to 2.2-15.0g. The thin base membrane can be a reverse osmosis membrane with a corresponding thickness, or a microfiltration, ultrafiltration, or nanofiltration water treatment membrane, which can realize cross-flow filtration in this embodiment.

The softness test in the present invention adopts the Handle-O-Meter of Thwing-Albert Instrument Company. Its standard measurement range is 0-100g, and the weighted measurement range is 0-1000g. The unit g used is the measurement range of the instrument. units in. Softness in this application is the measured softness value. When measuring, it can be divided into transverse softness test and longitudinal softness, and its value is within the range limited by this application. The softness of existing reverse osmosis membranes measured using this instrument is about 220 to 280g. Of course, other similar softness testers can also be used to test and convert between different units.

As a further limitation, in other embodiments, the stiffness of the thin base film 100 is 2.0-4.2 cm, and the surface of the rolled film bag 1 is a flat curved surface. The stiffness here can be determined by referring to the detection method of bending length in the national standard GB/T 18318-2001.

Softer membrane materials can reduce the impact of wrinkles, but because the material itself is soft and has insufficient support strength, it is easy to deform. Within a limited stiffness range, the surface of the rolled membrane element can be roughly flat and curved. Reduces wrinkles.

Figure 6 is a schematic diagram of the film rolling effect of the reverse osmosis membrane with a certain degree of softness and stiffness used in this application. The long sides of the different layers are staggered so that the folded edges of the different layers can be observed during rolling. There are still no obvious wrinkles at the end, and the sharp corners formed due to force transmission are eliminated.

The thin base membrane used may be a membrane formed of polyolefin microporous membrane, etc. For example, a reverse osmosis polyolefin microporous membrane can be formed by coating a thin base membrane with filter material. For details, please refer to the existing membrane material processing technology.

7 and 8 , in order to better support the thin base diaphragm 100 , a manifold chamber 403 is formed between the first end cover 4 and the central tube 2 , which is arranged around the central tube 2 and connected with the drainage water channel 402 . When working, the concentrated water that cannot be filtered on the inside of the Boji diaphragm may exert a certain pressure on the diaphragm at the first long side. The support part can play a supporting role to avoid large deformation of the diaphragm, and at the same time, the drainage channel is used 402 and the manifold chamber 403 do not affect the pure water outlet.

In a specific way, the mounting part 41 of the first end cover 4 is cylindrical, and the pure water outlet end of the membrane element is installed in the cylinder. The end surface of the pure water outlet end of the membrane element is supported by the support part 401. The water diversion channel 402 is a trough structure formed on the support part 401. The troughs may be distributed in a radial direction. The water diversion channel 402 of the trough structure divides the support part into multiple connected or spaced blocks. The manifold chamber 403 is an annular cavity formed in the first end cover. A plurality of water diversion channels 402 are all connected with the manifold chamber 403, and the pure water flowing out of the end face is introduced into the manifold chamber 403. As a variation of the manifold chamber 403, it can be intermittently provided on the outer periphery of the central tube and cooperate with the flow guide hole 201.

As another implementation of the water diversion channel 402, the water diversion channel 402 is a hole structure. One end of the drainage water channel 402 is located on the surface of the support part 401, and the other end is introduced into the manifold chamber 403 to also achieve the drainage function. In other embodiments, the drainage water channel can also be a combination structure of grooves and holes, which is mainly used for drainage and is not specifically limited.

In order to prevent pure water from being contaminated, strict sealing is required. Therefore, glue can be applied to the outer edge of the support part 401 to seal the outer edge of the end face of the pure water outlet to prevent concentrated water or pure water from entering the manifold chamber. During implementation, a glue groove can be set up on the outer edge of the support part. The glue groove is recessed relative to the surface of the support part. If the sealant is filled in the glue groove, the glue liquid can flow into the surface of the support part and affect the pure water outlet.

In order to facilitate processing and manufacturing, in some embodiments, the supporting part 401 may also be independent of the mounting part 41 , that is, the supporting part 401 and the mounting part 41 adopt a separate structure. Referring to FIG. 9 , in this embodiment, a support platform 405 can be provided in the inner cavity of the mounting part 41 . The support part 401 is a plate-like structure with openings and is erected on the support platform 405 . The area corresponding to the support platform is the manifold chamber 403 . Of course, legs can also be provided on the support portion 401 to form a manifold region. The connection between the support portion 403 and the mounting portion 41 can also be in various forms such as snapping, bonding, or bolting, and is not specifically limited.

In some embodiments, the mounting part 41 may have a boss structure in shape, with the part with a larger outer diameter used to install the membrane element, and the part with a smaller outer diameter used to connect the central pipe. A groove body can also be provided on the outer wall of the mounting part 41 to facilitate the removal of the mounting part from the membrane element. If the first end cover 4 is connected to the membrane shell and delivers or inlets water to the outside, the first end cover 4 also includes a mounting head 42, the inner side of the mounting head 42 is connected to the central tube 2, and the outer wall is provided with a circumferential There can be multiple sealing grooves, which are used to install sealing elements to achieve sealing of the end cover.

Regarding the central tube 2, Figure 10 shows an embodiment. The central tube 2 is a hollow structure that runs through both ends. The inside of the central tube 2 is a pure water chamber. One end surface of the central tube 2 is located in the manifold chamber 403 and is directly connected to the manifold chamber 403 and flows back. Send pure water to the other end. At this time, water needs to enter from the end face or side of the membrane element. Taking the end face water inlet as an example, a raw water inlet is provided on the side of the second long side 102 close to the central tube 2, that is, formed between the second end cover 5 and the central tube. The raw water inlet; the first short side 103 is the concentrated water outlet, so that one end of the filter element is the raw water inlet and the other end is the pure water outlet. In the water inlet structure of this embodiment, as another alternative to the central pipe, guide holes 201 are provided on the side walls of the central pipe 2. Multiple guide holes are distributed along the axial direction, and the guide holes 201 are correspondingly distributed in In the manifold chamber 403, the guide hole 201 can communicate with the manifold chamber 403 and the pure water chamber. Pure water can be directly introduced to the outside of the first end cap 4 through the central tube.

In other embodiments, with reference to Figure 11, a partition 202 is provided in the hollow structure of the central tube 2 to divide the cavity in the central tube into two parts. One side of the partition 202 is the pure water chamber and the other side is the water diversion chamber 204. , a plurality of water diversion holes 203 are provided on its side wall. The water diversion chamber 204 can be connected to the raw water source, and then the water flow is transported to the raw water side of the membrane element through the water diversion hole 203, and the remaining water after filtration The concentrated water can be discharged from the outside.

In the above structure, water can also be fed from the outside of the membrane element, and the filtered concentrated water will enter the water diversion chamber 204 of the central tube from the water inlet hole 203, and then the concentrated water will be discharged from the central tube.

In conjunction with the above embodiments, during implementation, a sealing member for sealing between the membrane element and the membrane shell is also included, and the sealing member may be a sealing ring 6 . Set a sealing ring around the membrane element, and a Y-shaped sealing ring can be used. The sealing ring can also be set on the first end cap or the second end cap, which is selected according to the sealing requirements.

In other embodiments, the raw water diversion net 110 on the raw water side of the membrane bag 1 is basically consistent with the size of the membrane bag 1 in the width and length directions; in the length direction, the raw water diversion net 110 can be connected with the raw water inlet. , used to guide raw water into the membrane bag 1. In the length direction, the raw water diversion net 110 can be equal to the length of the membrane bag 1, or can be longer than the length of the membrane bag 1 to facilitate water inlet.

In one embodiment, the pure water guide cloth 3 can be connected to the central tube 2, and the membrane bag 1 is connected to the central tube and rolled to form a membrane element. In another embodiment, the pure water diversion cloth 3 can be connected to the central tube 2, and there is a certain distance between the membrane bag 1 and the central tube to form a non-contact structure.

During specific winding, the film bag 1 is wound on the central tube 2 by stretching and tensioning, and there is a certain tension inside it for friction between different layers to avoid retraction.

Based on the above embodiments, the membrane element water inlet and outlet structure of the present application can have various specific embodiments. For example, on the pure water side of the membrane bag 1, its second short side 104 is connected to the central tube 2, for example, pasted on the outer wall of the central tube 2 to form a seal, and there are adhesive strips pasted along the first short side 103 and the second long side 102. 120, so that the central tube 2, the first short side 103 and the second long side 102 form a sealed structure, and pure water can only flow out from the first long side. In addition, if the sealing strip 120 at the first short side 103 is still a certain distance from the edge of the film bag, it is necessary to seal the edge by pasting the strip.

Figure 12 shows a sealing method on the pure water side. On the pure water side of the membrane bag 1, there are adhesive strips 120 posted on the first short side 103, the second short side 104 and the second long side 102, forming a U shape. Sealed structure. The seal is made by pasting the rubber strip 120 on the pure water side of the membrane bag 1. After winding, the rubber strip 120 and the pure water side surface of the membrane bag 1 form a closed area, which can be isolated from raw water and concentrated water. On the raw water side of membrane bag 1, raw water can flow circumferentially after entering. The specific water inlet and outlet methods can refer to the water inlet and outlet methods of existing membrane elements. When purifying water, after raw water enters, the pure water that passes through the thin base membrane 100 flows in the direction of the first long side 101, and the pure water flows out from the end surface where the first long side 101 of the membrane element is located.

It is worth noting that in this embodiment, the main rubber strip 121 on the pure water side close to the second short side 104 has a certain distance from the second short side 104. This distance can enable the raw water to be circumferentially isolated from the pure water side. In addition, the area between the main rubber strip 121 and the central tube 2 is sealed by the side rubber strip 122, which is close to the first long side 101, ensuring that the pure water and raw water at the end can also be sealed. Of course, as other sealing methods, sealing can be achieved by gluing the center ring at the end of the wound membrane element instead of the side rubber strips 122, or a combination of multiple sealing methods.

Correspondingly, the same method can be used to isolate pure water and concentrated water at the concentrated water outlet, which can be sealed by applying adhesive strips to the membrane bag and gluing the outer ring of the end.

Combined with the above embodiments, in this embodiment, the length of the film bag 1 along the first long side 101 direction is further limited. At present, conventional membrane elements are generally controlled within 0.8m due to the limitations of pure water channels to avoid the formation of long flow channels. In the solution of the present invention, due to the short flow channel structure, the pure water flow is not affected by the length of the membrane bag. Longer membrane elements can be used, and the length can reach 3m or more. By lengthening the raw water channel, the flow rate of the raw water side can be increased to avoid the formation of sedimentation.

Combining the corresponding structures of the membrane elements and membrane bags in the above embodiments, as another membrane element embodiment of the present invention, at least two membrane bags 1 may be provided in the membrane element, for example, 3 or 4 membrane bags may be used. There is a pure water diversion cloth 3 between adjacent film bags 1 .

In addition, the two film bags 1 can also have an integrated structure, which is formed by folding the thin base film 100 along the first long side 101 and then folding it twice along the second short side 104 . When four membrane bags 1 are provided, two membrane bags 1 with an integrated structure are used as a group, and the four membrane bags can be divided into two groups to form one membrane element. When an odd number of film bags are used, one of the film bags can be a separate film bag structure.

As an embodiment of the filter element, the membrane element used is the membrane element in each of the above embodiments, or a membrane element in which various parts are combined in different embodiments. The filter element has a membrane shell, and the membrane element is installed in the membrane shell. The shell can be provided with a raw water interface, a pure water interface and a concentrated water interface, which serve as the interface between the waterway joint and the external water purifier to form a filtration system.

Further explain and demonstrate the implementation of membrane elements and filter elements.

Figure 13 shows an embodiment of the filter element.

The membrane shell has a shell 71 and a shell cover 72. The shell 71 and the shell cover 72 are snap-fitted or threadedly connected. The first end cap is installed at the end of the housing 71 . The sealing ring 6 of the membrane element is sealed with the inner wall of the membrane shell. Water enters the membrane element from the end where the second end cover is located, and the filtered concentrated water flows out from the side of the membrane element. The central tube 2 has a partition to separate raw water from pure water. The central tube 2 has a guide hole 201 close to the pure water outlet end. The first end cover 4 and the central tube 2 form a sealed pure water transfer chamber. After the pure water enters the central tube, it flows out from the pure water interface on the membrane shell.

The concentrated water flows out from the side, and a concentrated water channel and a concentrated water interface are formed at the end of the shell to discharge the concentrated water. A raw water interface is provided on the shell cover for raw water inflow. In order to avoid the mixing of concentrated water and raw water, a sealing ring 6 is installed near the second end cover and a Y-shaped sealing ring is used. Since the water inlet side pressure is greater than the concentrated water side pressure, the opening of the Y-shaped sealing ring faces the second end cover, that is, the water inlet side.

In order to ensure the installation effect of the sealing ring, blue tape with holes can be used on the outside of the membrane element, and the Y-shaped sealing ring is installed in the part without holes to achieve upper and lower sealing.

Figure 14 shows another installation method of the sealing ring, which is installed on the second end cover. In order to avoid slippage of the Y-shaped sealing ring To move, set a limited step on the second end cover. In this way, no material can be wrapped around the membrane element.

Further, as a variation of another embodiment, using the filter element of this structure, the water paths of raw water and concentrated water can be exchanged, that is, water can be fed in from the side of the membrane element, and concentrated water can be discharged from the central pipe at the second end cover. It is worth mentioning that with this water outlet method, the Y-shaped sealing ring in Figure 13 can also be installed in the opposite direction, that is, the opening faces the direction of the first end cover to achieve a better sealing effect.

Figure 15 shows one filter element embodiment.

In this embodiment, water enters through a hole on the side of the membrane element, and concentrated water flows out from the center of the second end cap. A sealed space is formed between the first end cap and the central tube. There is only a pure water cavity inside the central tube, forming a through-structure. The end of the central tube is provided with a gap, which serves as a guide hole. Pure water enters the central tube from the guide hole of the central tube in the first end cover and flows out from the lower end of the central tube.

Leave a portion of the long side of the membrane bag unsealed as a concentrated water outlet, that is, a concentrated water outlet will be formed on the second end cap. The Y-ring seal separates the feed water above and the concentrate water below. As a modification of this embodiment, the Y-shaped ring can also be designed on the second end cover to achieve the purpose of limiting the position and simplifying the outer ring material of the membrane element.

Figure 16 shows an embodiment in which the filter element uses another central tube.

The central pipe 2 is provided with a partition near the pure water outlet end for separating raw water inlet and pure water. There are multiple sets of water inlet/outlet holes arranged on the central tube for even distribution of water. During operation, water enters from the central tube, and the raw water enters the raw water side of the membrane bag through the drainage hole on the central tube, and the concentrated water flows out from the opening on the side of the membrane element.

In this embodiment, the raw water interface is located on the shell cover 72, and the concentrated water interface and pure water inlet are both located on the shell 71.

The filter element structure shown above realizes the short channel solution for pure water, ensures that the membrane element of this folding solution has a long service life, and improves the efficiency of pure water production.

The present invention and its embodiments are schematically described above. This description is not limiting. What is shown in the drawings is only one embodiment of the present invention, and the actual structure is not limited thereto. Therefore, if a person of ordinary skill in the art is inspired by the invention and without departing from the spirit of the invention, can devise structural methods and embodiments similar to the technical solution without inventiveness, they shall all fall within the protection scope of the invention. .

Claims

An end-flow type filter element assembly includes a central tube and a membrane element. The membrane element has at least one membrane bag. The membrane bag has opposite first long sides and second long sides, and opposite first short sides and second short sides. side, the film bag is wound on the central tube along the extending direction of the first long side; it is characterized by:

The membrane bag is formed by folding a thin base membrane sheet along the first long side. The opposite inner side of the membrane bag is the raw water side, and the outer side is the pure water side; a raw water diversion net is provided on the raw water side, and a raw water diversion net is provided on the pure water side. Pure water diversion cloth; during filtration, the water flow can enter the raw water side from the raw water inlet, and the pure water formed by passing through the thin base membrane flows in the direction of the first long side, and flows out from the pure water outlet end where the first long side is located;

The pure water outlet end of the membrane element is equipped with a first end cap, and the packaging part of the first end cap is sleeved on the outer periphery of the membrane element; the inner cavity of the first end cap has a support part for supporting the thin substrate. The first long side of the diaphragm is formed with a drainage channel on the support part for discharging pure water;

The other end of the membrane element is covered with a second end cap. The inner end face of the second end cap is at least partially sealed with the end face of the membrane element. The central tube penetrates the inner end face of the second end cap.
An end-face convergence filter element assembly according to claim 1, characterized in that: the stiffness of the thin base membrane is 2.0-4.2cm, and the surface of the rolled membrane bag is a generally flat curved surface;

Or: the thickness of the thin base diaphragm is 0.008~0.09mm, and the softness is 2.0~30.0g, so that it can eliminate the wrinkles formed at the first long side when rolling the film; the stiffness of the thin base diaphragm is 2.0~4.2cm, the surface of the rolled film bag is a roughly flat curved surface.
An end-face convergence filter element assembly according to claim 1, characterized in that a sealing structure is formed along the first short side, the second short side and the second long side on the pure water side of the membrane bag.
An end-face converging filter element assembly according to claim 1, characterized in that: at the pure water outlet end of the membrane element, its outer edge is glued and sealed with the first end cap.
An end-face convergence filter element assembly according to claim 4, characterized in that: a glue groove is provided at the edge of the support part, and the glue groove is recessed relative to the surface of the support part; the glue groove is filled with sealant.
An end-face converging filter element assembly according to claim 1, characterized in that: a converging chamber is provided in the first end cover, which is arranged around the central tube and connected with the drainage water channel, and pure water is discharged through the converging chamber.
An end-face confluence type filter element assembly according to claim 6, characterized in that: the central tube has a hollow pure water chamber, and a guide hole is provided on the side wall of the central tube, and the guide hole connects the confluence chamber and the pure water cavity; the pure water cavity is connected to the end face of the central tube and is used to discharge pure water.
An end-face convergence type filter element assembly according to claim 7, characterized in that: a partition is provided in the central tube, one side of the partition is a pure water chamber, and the other side is a water diversion chamber, and the partition is close to the pure water chamber. Water outlet end; the side wall of the central tube is provided with a number of water diversion holes connected to the water diversion chamber, and the water diversion holes are connected to the raw water side of the membrane bag.
An end-face convergence type filter element assembly according to claim 6, characterized in that: the support part and the installation part are an integral structure or separated, and the water diversion channel is a groove structure or a hole structure on the support part.
An end-face convergence type filter element assembly according to claim 1, characterized in that: the first end cover further includes a mounting head, the inner side of the mounting head is connected to the central pipe, and the outer wall is provided with a circumferential sealing groove.
An end-face convergence type filter element assembly according to claim 1, characterized by: further comprising a sealing member, which is annularly sleeved on the outer circumference of the membrane element or the second end cap, or the second end cap.
An end-face convergence type filter element assembly according to claim 11, characterized in that the sealing member is a Y-shaped sealing ring, and its opening faces one end of the raw water inlet.
An end-face convergence type filter element assembly according to claim 12, characterized in that: the sealing member is annularly sleeved on the outer periphery of the second end cover, and a step is provided on the second end cover, and the bottom end of the sealing member Press against the step to restrict it from sliding toward the first end cap; or:

The outer periphery of the membrane element is covered with a rubber film, and a number of film holes are opened on the rubber film for water inlet or drainage; a Y-shaped sealing ring is set on the rubber film, and the area between the Y-shaped sealing ring and the second end cover The adhesive film is in a closed state.
An end-face confluence type filter element assembly according to claim 1, characterized in that: the first end cover and the second end cover are both made of non-metallic materials.
An end-face confluence type filter element assembly according to claim 1, characterized in that: a seal is formed at the first long side of the raw water side of the membrane bag, and a short side position of the first short side or the second short side is It is used as the raw water inlet, the other short side is used as the concentrated water outlet, or the partially unsealed position on the second long side is used as the concentrated water outlet.
A filter element, characterized in that: it includes the filter element assembly according to any one of claims 1-15, and further includes a membrane shell, and the filter element assembly is installed in the membrane shell.
A filter element according to claim 16, characterized in that: the membrane shell includes a shell and a shell cover, and the shell and the shell cover are snap-fitted or threadedly connected.
A filter element according to claim 17, characterized in that: the end of the housing is provided with a raw water interface and a pure water interface, and a concentrated water interface is provided on the shell cover connected to the other end;

Or: a concentrated water interface and a pure water interface are provided at one end of the shell, and a raw water interface is provided on the shell cover connected to the other end. The central tube has pure water chambers connected to both ends. The pure water at the pure water outlet flows out from the pure water outlet through the pure water chamber.