Reverse osmosis membrane assembly and filtering device comprising same

Abstract

The utility model relates to the technical field of water purification equipment, particularly provides a reverse osmosis membrane assembly and a filtering device comprising the reverse osmosis membrane assembly, and aims to solve the problem that the use experience of a user is poor due to the problems of low flow speed and short service life of an existing filter element. The reverse osmosis membrane assembly comprises a central pipe and a membrane element, the membrane element is provided with a raw water channel and a pure water channel, the pure water channel is provided with an opening facing the central pipe, the raw water channel is provided with a raw water opening and a concentrated water opening, and the membrane element is provided with a first end face, a second end face and a side edge. The raw water port is located in the first end face and is shorter than the first end face, and the concentrated water port is formed in the side edge and is shorter than the side edge. According to the reverse osmosis membrane assembly, the flow path of raw water in the raw water channel can be increased, the filtering efficiency of the reverse osmosis membrane assembly on the raw water is improved, the flow speed of the raw water can be effectively improved, membrane pollution caused by deposition of pollutants on the membrane is avoided, and the service life is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of water purification equipment, and specifically provides a reverse osmosis membrane component and a filtering device comprising the reverse osmosis membrane component. Background Art

[0002] As people's living standards improve, their demand for drinking water is also increasing. Water purifiers and other drinking water purification equipment have gradually become essential drinking water facilities in people's daily lives.

[0003] At present, water purifiers on the market face pain points such as low flow rate and short life, which leads to slow water output and the need for frequent filter replacement, affecting the user experience. How to increase the flow rate of the filter and extend the life of the filter is the biggest challenge currently facing the industry.

[0004] The utility model is in urgent need of providing a filter element that can increase the flow rate, slow down the pollution rate of the membrane and extend the service life. Utility Model Content

[0005] The utility model aims to solve the above technical problems at least to a certain extent, that is, to solve at least to a certain extent the problem that the existing filter element has low flow rate and short service life, resulting in poor user experience.

[0006] In a first aspect, the utility model provides a reverse osmosis membrane assembly, which includes: a central tube having a through hole; and a membrane element wound on the outer side of the central tube, the membrane element including at least two reverse osmosis membrane sheets, a raw water channel is formed between the front sides of two adjacent reverse osmosis membrane sheets, a pure water channel is formed between the back sides of two adjacent reverse osmosis membrane sheets, the pure water channel has an opening toward the central tube and the opening is connected to the through hole, the raw water channel has a raw water inlet and a concentrated water inlet; when the membrane element is in an unfolded state, the membrane element has a first end face and a second end face arranged adjacent to the central tube and a side edge arranged away from the central tube, wherein the raw water inlet is located on the first end face and the length of the raw water inlet is less than the length of the first end face, and the concentrated water inlet is arranged on the side edge and the length of the concentrated water inlet is less than the length of the side edge.

[0007] In the preferred technical solution of the above reverse osmosis membrane assembly, the ratio of the length of the raw water inlet to the length of the first end face is 1 / 5 to 1 / 3.

[0008] In the preferred technical solution of the above reverse osmosis membrane assembly, the raw water inlet is arranged at a position close to the central tube, and the concentrated water inlet is arranged at a position away from the first end face.

[0009] In the preferred technical solution of the above-mentioned reverse osmosis membrane assembly, a first glue line, a second glue line and a third glue line are arranged on the back of the reverse osmosis membrane, wherein the first glue line is located on the first end face, the second glue line is located on the side, and the third glue line is located on the second end face, and the first glue line, the second glue line and the third glue line are connected in sequence to form the pure water channel.

[0010] In the preferred technical solution of the above-mentioned reverse osmosis membrane assembly, a first glue line and a second glue line are also provided on the back of the reverse osmosis membrane sheet, the first glue line is located on the first end face and covers the raw water inlet, the second glue line is located on the side, and when the membrane element is in a wound state, the reverse osmosis membrane assembly also includes a first sealant and a second sealant, the first sealant is provided on the first end face to form the raw water inlet, the second sealant is located on the second end face and seals the second end face, the first sealant, the first glue line, the second glue line and the second sealant together form the pure water channel.

[0011] In the preferred technical solution of the above reverse osmosis membrane assembly, the length of the first glue line is greater than the length of the raw water inlet.

[0012] In the preferred technical scheme of the above-mentioned reverse osmosis membrane assembly, the reverse osmosis membrane assembly also includes a first end cover, which is arranged close to the first end face and sealedly connected to the membrane element, and the first end cover is provided with a raw water inlet connected to the raw water inlet; and / or, the reverse osmosis membrane assembly also includes a second end cover, which is arranged on the second end face and can cover the concentrated water inlet, one end of the second end cover is sealedly connected to the membrane element, and the other end of the second end cover is provided with an assembly hole for the central tube to pass through, and in the assembled state, the central tube passes through the second end of the second end cover and extends to the outside of the second end cover, and the end of the central tube away from the first end face forms a pure water outlet, a concentrated water flow channel is formed between the membrane element and the second end cover, and the second end cover is provided with a concentrated water outlet connected to the concentrated water flow channel.

[0013] In the preferred technical solution of the above reverse osmosis membrane assembly, the first end cover is provided with a diverter rib, and the diverter rib divides the raw water inlet into a plurality of raw water inlets.

[0014] In the preferred technical solution of the above-mentioned reverse osmosis membrane assembly, a plurality of guide ribs are arranged in the second end cover, and the guide ribs are used to guide the concentrate in the concentrate flow channel; and / or, an annular flange adapted to the center tube is arranged on the second end cover, and the center tube passes through the annular flange and extends to the outside of the second end cover, and the concentrate outlet is formed between the annular flange and the center tube.

[0015] In the second aspect, the utility model also provides a filtering device, which includes a shell and a reverse osmosis membrane assembly as described above, wherein the reverse osmosis membrane assembly is located in the shell, and a raw water flow channel is formed between the shell and the reverse osmosis membrane assembly, and the shell is also provided with a raw water inlet, a pure water outlet and a concentrated water outlet, the raw water inlet is connected to the raw water flow channel, the concentrated water outlet is connected to the concentrated water outlet, and the pure water outlet is connected to the pure water outlet.

[0016] When adopting the above-mentioned preferred technical solution, by setting the raw water inlet on the first end face and setting the concentrated water inlet on the side, the flow rate of raw water in the raw water channel can be increased, thereby improving the filtration efficiency of the reverse osmosis membrane assembly for raw water. By setting the length of the raw water inlet to be smaller than the length of the first end face, the size of the raw water inlet can be reduced, thereby effectively increasing the flow rate of raw water, avoiding the deposition of pollutants on the membrane and causing membrane pollution, extending the service life of the reverse osmosis membrane assembly, and greatly improving the user experience.

[0017] Furthermore, compared with the reverse osmosis membrane assembly in the prior art, the length L of the raw water inlet is y The ratio between the length L of the first end face is set to 1 / 5≤a≤1 / 3, which can increase the flow rate of raw water by 3 to 5 times. At the same time, it can also avoid the raw water inlet being too small, which will affect the water production efficiency of the reverse osmosis membrane assembly, further improving the user experience.

[0018] Furthermore, compared with the form in which the first glue line, the second glue line and the third glue line are arranged on the back of the reverse osmosis membrane and the first glue line, the second glue line and the third glue line are connected in sequence to form a pure water channel, the form in which the first glue line, the first sealant, the second glue line and the second sealant are used to surround the pure water channel can effectively reduce the area occupied by the glue line of the reverse osmosis membrane, so that the filtration area of ​​the prepared reverse osmosis membrane assembly is larger, the filtration efficiency is higher, and the user experience is better.

[0019] Furthermore, by providing a first end cover and providing a diverter rib on the first end cover, raw water can enter the raw water channel through the raw water inlet more evenly, thereby further increasing the effective filtration area of ​​the reverse osmosis membrane and improving the filtration efficiency of the reverse osmosis membrane assembly.

[0020] Furthermore, by setting a second end cover, the concentrate produced by filtration in the raw water channel can be discharged into the concentrate flow channel through the concentrate outlet, and then flow out through the concentrate outlet on the second end cover, thereby facilitating the discharge of the concentrate. By setting guide ribs inside the second end cover, the concentrate in the concentrate channel can be guided, so that the concentrate around the membrane element can flow to the concentrate outlet more evenly.

[0021] In addition, the filtration device further provided by the utility model on the basis of the above-mentioned technical solution includes the reverse osmosis membrane assembly introduced above, and thus has the beneficial effects of the above-mentioned reverse osmosis membrane assembly. Compared with the filtration device before the improvement, the filtration device of the utility model has a higher water output speed, higher filtration efficiency, longer service life, and a better user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings, in which:

[0023] Figure 1 It is a schematic diagram of the structure of a reverse osmosis membrane assembly in the prior art;

[0024] Figure 2 yes Figure 1 Schematic diagram of water flow in the pure water channel;

[0025] Figure 3 yes Figure 1 Schematic diagram of the waterway flow of the Zhongyuan Water Channel;

[0026] Figure 4 This is a schematic diagram of the structure of the reverse osmosis membrane assembly of the utility model Figure 1 , which shows the position relationship diagram of various components in the winding state;

[0027] Figure 5 This is a schematic diagram of the structure of the reverse osmosis membrane assembly of the utility model Figure 2 , which shows the position relationship diagram of various components in the winding state;

[0028] Figure 6 1 is a schematic diagram of the structure of the reverse osmosis membrane assembly of the first embodiment of the present utility model, which shows the position relationship diagram of each component in the unfolded state;

[0029] Figure 7 It is a structural schematic diagram of a reverse osmosis membrane and a central tube in the first embodiment of the utility model;

[0030] Figure 8 yes Figure 7 Schematic diagram of water flow in the pure water channel;

[0031] Fig. 9 yes Figure 7 Schematic diagram of the waterway flow of the Zhongyuan Water Channel;

[0032] Fig.10 1 is a schematic diagram of the structure of the reverse osmosis membrane assembly of the second embodiment of the present utility model, which shows the position relationship diagram of each component in the unfolded state;

[0033] Fig.11It is a structural schematic diagram of a reverse osmosis membrane and a central tube in Embodiment 2 of the present utility model;

[0034] Fig.12 yes Fig.11 Schematic diagram of water flow in the pure water channel;

[0035] Fig.13 yes Fig.11 Schematic diagram of the waterway flow of the Zhongyuan Water Channel;

[0036] Fig.14 This is a schematic diagram of the structure of the filter device of the utility model. Figure 1 ;

[0037] Fig.15 This is a schematic diagram of the structure of the filter device of the utility model. Figure 2 ;

[0038] Fig.16 This is a schematic diagram of the structure of the filter device of the utility model. Figure 3 ;

[0039] Fig.17 yes Fig.16 Schematic diagram of the cross-sectional structure along line AA;

[0040] Fig.18 It is a structural schematic diagram of the first end cover of the utility model;

[0041] Fig.19 It is a structural schematic diagram of the second end cover of the utility model.

[0042] List of reference numerals:

[0043] 1. Central tube; 11. Through hole; 12. Pure water outlet; 2. Membrane element; 201. Raw water channel; 2011. Concentrated water guide net; 202. Pure water channel; 2021. Pure water guide net; 21. First end face; 211. First sealant; 212. Raw water outlet; 22. Second end face; 221. Second sealant; 23. Side; 231. Concentrated water outlet; 24. Reverse osmosis membrane; 2401. Front; 2402. Back; 241. First glue line; 242. Second glue line; 243 , the third rubber line; 25, waterproof tape; 251, water hole; 31, the first end cover; 311, diverter rib; 312, raw water inlet; 32, the second end cover; 321, assembly hole; 322, concentrate flow channel; 323, concentrate outlet; 324, guide rib; 325, annular flange; 4, outer shell; 41, shell; 42, cover body; 421, raw water inlet; 422, pure water outlet; 423, concentrate outlet; 431, the first sleeve; 432, the second sleeve; 44, raw water flow channel. DETAILED DESCRIPTION

[0044] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0045] It should be noted that in the description of the present invention, the terms "upper", "lower", "inner", "outer" and other terms indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", "third" and "fourth" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0046] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "setting" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] like Figure 6 , Figure 7 , Fig.10 and Fig.11 As shown, the reverse osmosis membrane assembly of the present invention comprises a central tube 1 and a membrane element 2 . The central tube 1 has a through hole 11 , and the membrane element 2 is wound on the outside of the central tube 1 .

[0048] The membrane element 2 includes at least two reverse osmosis membranes 24 , a raw water channel 201 is formed between the front sides 2401 of two adjacent reverse osmosis membranes 24 , a pure water channel 202 is formed between the back sides 2402 of two adjacent reverse osmosis membranes 24 , and the pure water channel 202 has a pure water outlet toward the central tube 1 , and the pure water outlet is connected to the through hole 11 .

[0049] When the membrane element 2 is in the unfolded state, the membrane element 2 has a first end face 21 and a second end face 22 arranged adjacent to the central tube 1 and a side edge 23 arranged away from the central tube 1, and the raw water channel 201 has a raw water inlet 212 and a concentrated water inlet 231, wherein the raw water inlet 212 is arranged on the first end face 21 and the length of the raw water inlet 212 is smaller than the length of the first end face 21, and the concentrated water inlet 231 is arranged on the side edge 23 and the length of the concentrated water inlet 231 is smaller than the length of the side edge 23.

[0050] Through such an arrangement, on the one hand, by setting the raw water inlet 212 on the first end face 21 and setting the concentrated water inlet 231 on the side 23, the flow of raw water in the raw water channel 201 can be increased, thereby improving the filtration efficiency of the reverse osmosis membrane assembly for raw water. On the other hand, by setting the length of the raw water inlet 212 to be smaller than the length of the first end face 21, the size of the raw water inlet 212 can be reduced, thereby effectively increasing the flow rate of raw water, avoiding the deposition of pollutants on the membrane and causing membrane pollution, extending the service life of the reverse osmosis membrane assembly, and greatly improving the user experience.

[0051] It should be noted that, in actual applications, those skilled in the art may configure the membrane element 2 to include two reverse osmosis membranes 24, or, may configure the membrane element 2 to include multiple reverse osmosis membranes 24, and so on. Such adjustments and changes to the specific number of reverse osmosis membranes 24 do not deviate from the principle and scope of the present invention, and should be included in the protection scope of the present invention.

[0052] Preferably, the membrane element 2 includes a plurality of reverse osmosis membrane sheets 24 .

[0053] By such an arrangement, that is, by arranging the membrane element 2 to include a plurality of reverse osmosis membrane sheets 24 , the filtration efficiency of the reverse osmosis membrane assembly can be improved, and thus the flux of the reverse osmosis membrane assembly can be improved.

[0054] It should be noted that, for the convenience of description, only two reverse osmosis membranes 24 are shown in the drawings of the present invention, but this is not restrictive, and the reverse osmosis membrane assembly of the present invention may also include multiple reverse osmosis membranes 24.

[0055] It should also be noted that, in actual applications, those skilled in the art may fold the reverse osmosis membrane along opposite edges to form a reverse osmosis membrane sheet 24, and then bond the folded edges to the central tube 1, or directly bond one side edge of multiple reverse osmosis membrane sheets 24 to the central tube 1, and so on. Such adjustments and changes to the specific formation methods of the multiple reverse osmosis membrane sheets 24 of the membrane element 2 do not deviate from the principle and scope of the present utility model, and should be included in the protection scope of the present utility model.

[0056] Exemplarily, the reverse osmosis membrane is folded along opposite edges to form a reverse osmosis membrane sheet 24 , and then the folded edges are bonded to the central tube 1 .

[0057] It should be noted that, in actual applications, technicians in this field can set the central tube 1 to be blocked at one end and form a pure water outlet 12 at the other end, or both ends of the central tube 1 can form pure water outlets 12, and so on. Such adjustments and changes to the specific setting type of the central tube 1 do not deviate from the principle and scope of the present utility model and should be included in the protection scope of the present utility model.

[0058] Preferably, one end of the central tube 1 close to the first end surface 21 is blocked, and one end of the central tube 1 away from the first end surface 21 forms a pure water outlet 12 .

[0059] It should be noted that, in actual applications, those skilled in the art may set the raw water inlet 212 at a position on the first end face 21 close to the central tube 1, or may set the raw water inlet 212 at a position on the first end face 21 far away from the central tube 1, and so on. Such adjustments and changes to the specific setting position of the raw water inlet 212 on the first end face 21 do not deviate from the principle and scope of the present utility model, and should be included in the protection scope of the present utility model.

[0060] Preferably, if Figure 7 , Fig. 9 , Fig.11 and Fig.13 As shown, the raw water inlet 212 is arranged on the first end surface 21 close to the central pipe 1 .

[0061] Through such a setting, compared with the form of setting the raw water inlet 212 at a position on the first end face 21 away from the central tube 1, setting the raw water inlet 212 at a position on the first end face 21 close to the central tube 1 can further extend the flow path of the raw water in the raw water channel 201 and further improve the filtration efficiency of the reverse osmosis membrane assembly.

[0062] It should be noted that the present invention does not impose any particular limitation on the relationship between the length of the raw water inlet 212 and the length of the first end surface 21 , as long as the length of the raw water inlet 212 is smaller than the length of the first end surface 21 .

[0063] like Fig. 9 and Fig.13 As shown, when the membrane element 2 is in the unfolded state, the length of the raw water inlet 212 is set to L y The length of the first end surface 21 is L, and the length of the raw water inlet 212 is L y The ratio between the length L of the first end surface 21 is set to a.

[0064] In some embodiments, the length L of the raw water inlet 212 may be y The ratio to the length L of the first end surface 21 is set to 1 / 5, 6 / 25, 7 / 25, 8 / 25, 1 / 4, 3 / 10, 1 / 3 or a range consisting of any two of these values.

[0065] Preferably, 1 / 5≤a≤1 / 3, where L y is the length of the original water inlet 212, L is the length of the first end surface 21, and a is the length L of the original water inlet 212 y The ratio between the length L of the first end surface 21 and the first end surface 21.

[0066] By such a configuration, the length L of the raw water inlet 212 is reduced compared with the reverse osmosis membrane assembly in the prior art. y The ratio between the length L of the first end face 21 is set to 1 / 5≤a≤1 / 3, which can increase the flow rate of raw water by 3 to 5 times. At the same time, it can also avoid the raw water inlet 212 being too small to affect the water production efficiency of the reverse osmosis membrane assembly, further improving the user experience.

[0067] Set the water flow rate flowing through the raw water inlet 212 to Q y , flow rate is V y , the cross-sectional area of ​​the original water inlet 212 is S y , S y Equal to the length L of the original water inlet 212 y The product of the gap thickness D between the membrane bags, wherein a membrane bag is formed between two adjacent reverse osmosis membranes.

[0068] According to the formula Since the gap thickness D between the membrane bags remains unchanged, the cross-sectional area S of the raw water inlet 212 is y The size depends on the length L of the water inlet y , the length L of the original water inlet 212 y The longer the cross-sectional area S y The larger the water flow rate V y The lower.

[0069] Below Take this as an example and combine the following two situations for detailed introduction.

[0070] It should be noted that, except for the length of the raw water inlet 212 , the length of the concentrate water inlet 231 , and the position of the concentrate water inlet 231 , the other parameters of the reverse osmosis membrane assemblies in the following two situations are the same.

[0071] Scenario 1:

[0072] like Figures 1 to 3 As shown, in the prior art, the raw water inlet 212 of the reverse osmosis membrane assembly is arranged on the first end surface 21 and the length L of the raw water inlet 212 is y1 The concentrate outlet 231 is equal to the length L of the first end face 21 . The concentrate outlet 231 is disposed on the second end face 22 and the length of the concentrate outlet 231 is equal to the length L of the second end face 22 .

[0073] Set the water flow rate of the original water inlet 212 to Q y1 , the cross-sectional area of ​​the original water inlet 212 is S y1 , the length of the original water inlet 212 is L y1 , the gap thickness between the membrane bags is D, and the length of the concentrated water outlet 231 is L n1, the cross-sectional area of ​​the concentrate outlet 231 is S n1 , the concentrated water flow rate is Q n1 , pure water flow rate is Q c1 , set the flow rate of the raw water inlet 212 to V y1 , the concentrated water flow rate is V n1 .

[0074]

[0075]

[0076] Due to S y1 =L y1 ×D,S n1 =L n1 ×D

[0077] So,

[0078]

[0079] Since the length L of the original water inlet 212 y1 =L, then

[0080]

[0081] Since the length L of the concentrated water outlet 231 is n1 =L, then

[0082]

[0083] In the case of a net-to-waste ratio of 3:1, Q c1 =3×Q n1 And Q c1 +Q n1 =Q y1 ;

[0084] So, Q y1 =4×Q n1 ; (7)

[0085] Substituting formula (7) into formula (6),

[0086] get:

[0087] set up

[0088] The raw water flow rate V y1 =V0, concentrated water flow rate

[0089] Scenario 2:

[0090] like Figures 6 to 9As shown, the water flow rate of the raw water inlet 212 in this embodiment is Q y2 (The water flow rate of the raw water inlet 212 in this embodiment is set to be consistent with the water flow rate of the raw water inlet 212 in the prior art, that is, Q y2 =Q y1 ), the cross-sectional area of ​​the original water inlet 212 is S y2 , the gap thickness between two adjacent reverse osmosis membranes 24 is D, the length of the reverse osmosis membrane 24 is L, the width of the reverse osmosis membrane 24 is W, and L=2×W. The flow rate of the raw water inlet 212 in this embodiment is V y2 , the length of the concentrated water outlet 231 is L n2 , and the length of the concentrated water outlet is half of the side, and the cross-sectional area of ​​the concentrated water outlet 231 is S n2 , the concentrated water flow rate is Q n2 , pure water flow rate is Q c2 .

[0091] but

[0092]

[0093] Due to S y2 =L y2 ×D,S n2 =L n2 ×D

[0094] So,

[0095]

[0096] In this embodiment, the length L of the raw water inlet 212 is y2 The ratio between the length L of the first end surface 21 is but

[0097]

[0098] Substituting formula (14) into formula (12),

[0099] get:

[0100] And Q y2 =Q y1 ,

[0101] Then, V y2 =5×V0

[0102] Since the length of the concentrated water outlet 231 L = 2 × W

[0103] but

[0104] Substituting formula (16) into formula (13),

[0105] Right now:

[0106] In the case of a net-to-waste ratio of 3:1, Q c2 =3×Q n2 , Q c2 +Q n2 =Q y2 ;

[0107] So, Q y2 =4×Q n2 ; (18)

[0108] Substituting formula (18) into formula (17), we obtain:

[0109]

[0110] And Q y2 =Q y1 ,

[0111] Then V n2 =V0.

[0112] In summary, the raw water flow rate V of the reverse osmosis membrane assembly (case 1) in the prior art is y1 =V0, the raw water flow rate V of the reverse osmosis membrane assembly of the utility model (case 2) y2 =5×V0, it can be seen that the raw water flow rate of the utility model is significantly improved compared with the prior art. At the same time, the concentrated water flow rate of the reverse osmosis membrane assembly (case 1) in the prior art is Concentrated water flow rate V of the reverse osmosis membrane assembly (case 2) of the utility model n2 =V0, it can be seen that the concentrated water flow rate of the utility model is also significantly improved compared with the prior art.

[0113] It can be seen from this that compared with the situation in the prior art, the flow rate of the raw water inlet 212 of the reverse osmosis membrane assembly of the utility model is 5 times the flow rate of the raw water inlet 212 in the prior art, which greatly improves the raw water flow rate of the reverse osmosis membrane assembly, and thus improves the water production speed of the reverse osmosis membrane assembly.

[0114] It should be noted that, in actual applications, technicians in this field can apply sealant on the second end face 22 after the membrane element 2 is wound to seal the second end face 22, or they can apply sealant between two adjacent reverse osmosis membrane sheets 24 on the second end face 22 before the membrane element 2 is wound, and then wind it to seal the second end face 22. Alternatively, they can first apply sealant between two adjacent reverse osmosis membranes on the second end face 22 before the membrane element 2 is wound, and then apply sealant on the second end face 22 after the membrane element 2 is wound, so that the second end face 22 is sealed, and so on. Such adjustments and changes to the sealing method of the second end face 22 do not deviate from the principle and scope of the present invention, and should be included in the protection scope of the present invention.

[0115] Preferably, after the membrane element 2 is wound, a sealant is applied on the second end surface 22 to seal the second end surface 22 .

[0116] It should be noted that, in actual applications, technicians in this field may apply sealant on the side of the first end face 21 away from the central tube 1 after the membrane element 2 is wound so as to form a raw water inlet 212 on the first end face 21, or, before the membrane element 2 is wound, apply sealant between two adjacent reverse osmosis membranes on the first end face 21 away from the central tube 1 so as to form a raw water inlet 212 on the first end face 21, or, before the membrane element 2 is wound, apply sealant between two adjacent reverse osmosis membranes on the first end face 21 away from the central tube 1 so as to form a raw water inlet 212 on the first end face 21, or, before the membrane element 2 is wound, apply sealant between two adjacent reverse osmosis membranes on the first end face 21 away from the central tube 1 so as to form a raw water inlet 212 on the first end face 21.

[0117] Preferably, after the membrane element 2 is wound, a sealant is applied to a side of the first end surface 21 away from the central tube 1 so as to form a raw water inlet 212 on the first end surface 21 .

[0118] It should be noted that, in actual applications, the present invention does not impose any limitation on the specific formation method of the pure water channel between the back sides 2402 of two adjacent reverse osmosis membranes 24. As long as the pure water channel can be formed between the back sides 2402 of two adjacent reverse osmosis membranes 24, such adjustment and change to the specific formation method of the pure water channel does not deviate from the principle and scope of the present invention and should be included in the protection scope of the present invention.

[0119] The reverse osmosis membrane assembly of the present utility model is introduced below in conjunction with the following two embodiments.

[0120] Embodiment 1:

[0121] like Figures 6 to 9As shown, the back side 2402 of two adjacent reverse osmosis membrane sheets 24 is also provided with a first rubber line 241, a second rubber line 242 and a third rubber line 243, wherein the first rubber line 241 is arranged on the first end surface 21, the second rubber line 242 is arranged on the side 23, and the third rubber line 243 is arranged on the second end surface 22. The first rubber line 241, the second rubber line 242 and the third rubber line 243 are connected in sequence to form a pure water channel 202 with an opening at one end, and the opening is arranged toward the central tube 1 and is connected to the through hole 11.

[0122] Before the membrane element 2 is wound, the first glue line 241, the second glue line 242 and the third glue line 243 are firstly coated on the back side 2402 of two adjacent reverse osmosis membrane sheets 24 to form a pure water channel 202 between the back sides 2402 of the two adjacent reverse osmosis membrane sheets 24. After the membrane element 2 is wound, the first sealant 211 is coated on the side of the first end face 21 away from the central tube 1 to form a raw water inlet 212 on the first end face 21. The second sealant 221 is coated on the second end face 22 to seal the second end face 22 to complete the production of the reverse osmosis membrane assembly.

[0123] Embodiment 2:

[0124] like Figures 10 to 13 As shown, the back side 2402 of two adjacent reverse osmosis membrane sheets 24 is also provided with a first glue line 241 and a second glue line 242. The first glue line 241 is arranged on the first end face 21 and the first glue line 241 can cover the raw water inlet 212. The second glue line 242 is arranged on the side 23. When the membrane element 2 is in a wound state, the reverse osmosis membrane assembly also includes a first sealant 211 and a second sealant 221. The first sealant 211 is arranged on the first end face 21 to form the raw water inlet 212. The second sealant 221 is arranged on the second end face 22 to seal the second end face 22. The first glue line 241, the first sealant 211, the second glue line 242 and the second sealant 221 together form a pure water channel 202.

[0125] Before the membrane element 2 is wound, the first glue line 241 and the second glue line 242 are first applied on the back side 2402 of two adjacent reverse osmosis membrane sheets 24. After the membrane element 2 is wound, the first sealant 211 is applied on the side of the first end face 21 away from the central tube 1 to form a raw water inlet 212 on the first end face 21. The second sealant 221 is applied on the second end face 22 to seal the second end face 22, thereby completing the production of the reverse osmosis membrane assembly.

[0126] It should be noted that, in actual applications, those skilled in the art may set the length of the first glue line 241 to be equal to the length of the original water inlet 212, or may set the length of the first glue line 241 to be greater than the length of the original water inlet 212, and so on. Such adjustments and changes to the specific length of the first glue line 241 do not deviate from the principle and scope of the present invention, and should be included in the protection scope of the present invention.

[0127] Preferably, the length of the first glue line 241 is greater than the length of the raw water inlet 212 .

[0128] Specifically, the ratio of the length L1 of the first glue line 241 to the length L of the first end surface 21 is 1 / 2.

[0129] It should be noted that, although both of the above two embodiments can form a pure water channel 202 between two adjacent reverse osmosis membrane sheets 24, compared with embodiment 1, the gluing method for forming the pure water channel 202 in embodiment 2 has a smaller gluing area, a larger filtration area of ​​the obtained reverse osmosis membrane assembly, and a higher filtration efficiency.

[0130] Combine the following Figure 8 and Fig.12 Give a detailed introduction.

[0131] (1) Calculation of the percentage of the glue line occupying the total area of ​​the diaphragm in Example 1:

[0132] like Figure 8 As shown, the length L of the first end face 21 and the second end face 22 of the membrane element 2 in the unfolded state is set to 50 cm, the width of the membrane element 2 (the length of the side 23) is W = 25 cm, the width of the glue line on the first end face 21 is H1 = 3 cm, the width of the glue line on the second end face 22 is H2 = 3 cm, and the width of the glue line on the side 23 is H3 = 3 cm.

[0133] Then the total area of ​​the diaphragm is S = L × W = (50 × 25) cm 2 =1250cm 2 .

[0134] It should be noted that although Figure 8 The first sealant 211 is not set at the position corresponding to the original water inlet, but because the first glue line 241 has been applied at this position, although the first sealant 211 is not set at the position corresponding to the original water inlet, it cannot be effectively utilized. During calculation, this area is regarded as the area occupied by the glue line.

[0135] Therefore, the area occupied by the glue line S1 = H1 × L + H2 × L + (W-H1-H2) × H3;

[0136] That is: S1 = [3 × 50 + 3 × 50 + (25-3-3) × 3] cm2

[0137] S1=357cm 2 ;

[0138] The percentage of the total membrane area occupied by the glue line of the single membrane of the reverse osmosis membrane prepared in Example 1

[0139] K1=28.56%.

[0140] (2) Calculation of the percentage of the glue line occupying the total area of ​​the diaphragm in Example 2:

[0141] Specifically, Fig.12 As shown, the length L of the membrane element 2 is set to be 50 cm, the width W of the membrane element 2 is set to be 25 cm, the width H1 of the glue line on the first end surface 21 is set to be 3 cm, and the length of the glue line on the first end surface 21 (ie, the first glue line 241) is set to be The width of the glue line on the second end surface 22 is H2 = 0.5 cm, and the width of the glue line on the side edge 23 is H3 = 3 cm.

[0142] Then the total area of ​​the diaphragm is S = L × W = (50 × 25) cm 2 =1250cm 2 .

[0143] It should be noted that although Fig.12 The first sealant 211 is not set at the position corresponding to the original water inlet 212, but because the first sealant 211 has been applied at this position, although the first sealant 211 is not set at the position corresponding to the original water inlet 212, it cannot be effectively utilized. During calculation, this area is regarded as the area occupied by the glue line.

[0144] Glue line area

[0145] That is: S2 = [0.5 × 50 + 3 × 0.5 × 50 + 0.5 × 0.5 × 50 + (25-3-0.5) × 3] cm 2

[0146] We get S2 = 177 cm 2 .

[0147] The percentage of the glue line occupying the total area of ​​the diaphragm

[0148] K2=14.16%.

[0149] K1-K2=28.56%-14.16%=14.4%

[0150] It can be seen that compared with the gluing method shown in Example 1, the gluing method shown in Example 2 to form the pure water channel 202 can reduce the area occupied by the glue line by 14.4%, that is, the effective filtration area of ​​the reverse osmosis membrane assembly prepared by the gluing method shown in Example 2 is increased by 14.4%.

[0151] Preferably, if Figure 8 and Fig.10 As shown, a concentrated water guide net 2011 is provided between the front sides 2401 of two adjacent reverse osmosis membranes 24 .

[0152] By providing the concentrate diversion net 2011 , the concentrate in the raw water channel 201 can be diverted, so that the concentrate generated by filtration in the raw water channel 201 flows evenly to the concentrate outlet 231 .

[0153] It should be noted that, in actual applications, those skilled in the art may set the number of concentrated water diversion nets 2011 to only one, or may set the number of concentrated water diversion nets 2011 to two, or may set the number of concentrated water diversion nets 2011 to multiple, and so on. Such adjustments and changes to the specific setting number of concentrated water diversion nets 2011 do not deviate from the principle and scope of the present utility model, and should be included in the protection scope of the present utility model.

[0154] Preferably, there are multiple concentrated water diversion nets 2011.

[0155] Preferably, if Figure 8 and Fig.10 As shown, a pure water guide net 2021 is arranged between the back sides 2402 of two adjacent reverse osmosis membranes 24 .

[0156] By providing the pure water guide net 2021 , it is possible to guide the pure water in the pure water channel 202 , so that the pure water in the pure water channel 202 flows evenly toward the pure water outlet.

[0157] It should be noted that, in actual applications, those skilled in the art may set the number of pure water diversion nets 2021 to only one, or may set the number of pure water diversion nets 2021 to two, or may set the number of pure water diversion nets 2021 to multiple, and so on. Such adjustments and changes to the specific setting number of pure water diversion nets 2021 do not deviate from the principle and scope of the present utility model, and should be included in the protection scope of the present utility model.

[0158] Preferably, there are multiple pure water guide nets 2021.

[0159] Preferably, if Figure 8 and Fig.10As shown, the reverse osmosis membrane assembly of the present invention further includes a waterproof tape 25 , which is wound around the outside of the membrane element 2 , and a water hole 251 is provided on the waterproof tape 25 at a position corresponding to the concentrated water outlet 231 .

[0160] Preferably, if Fig.15 and Fig.17 As shown, the reverse osmosis membrane assembly of the present invention also includes a first end cover 31, wherein the first end cover 31 is arranged close to the first end face 21 and is sealed with the membrane element 2, and the first end cover 31 is provided with a raw water outlet for raw water to pass through at a position corresponding to the raw water inlet 212.

[0161] Preferably, if Fig.18 As shown, a diverter rib 311 is provided on the first end cover 31 , and the diverter rib 311 divides the raw water inlet into a plurality of raw water inlets 312 .

[0162] Through such an arrangement, raw water can enter the raw water inlet 212 more evenly, and further enter the membrane element 2 more evenly to filter the raw water, further improving the filtering efficiency of the reverse osmosis membrane assembly.

[0163] It should be noted that, in actual applications, those skilled in the art may configure the first end cover 31 to be sealed and connected to the first end face 21 via tape, or may configure the first end cover 31 to be sealed and connected to the first end face 21 via gluing, etc. Such adjustments and changes to the specific connection method between the first end cover 31 and the first end face 21 do not deviate from the principle and scope of the present utility model, and should be included in the protection scope of the present utility model.

[0164] Preferably, if Fig.15 and Fig.17 As shown, the reverse osmosis membrane assembly of the utility model also includes a second end cover 32, wherein the second end cover 32 is covered on the second end face 22 and covers the concentrate outlet 231, one end of the second end cover 32 is sealed and connected to the membrane element 2, and the other end of the second end cover 32 is provided with an assembly hole 321 for the central tube 1 to pass through. In the assembled state, the central tube 1 passes through the assembly hole 321 and extends to the outside of the second end cover 32, a pure water outlet is formed in the central tube 1, a concentrate channel 322 is formed between the second end cover 32 and the membrane element 2, and a concentrate outlet 323 connected to the concentrate channel 322 is also provided on the second end cover 32.

[0165] By providing the second end cover 32 , the concentrated water generated by filtration in the raw water channel can be discharged into the concentrated water flow channel 322 through the concentrated water port 231 , and then flow out through the concentrated water outlet 323 on the second end cover 32 , thereby facilitating the discharge of the concentrated water.

[0166] It should be noted that, in actual applications, those skilled in the art may configure the first end of the second end cover 32 to be bonded to the membrane element 2 via an adhesive tape, or may also achieve a sealed connection by applying glue between the second end cover 32 and the membrane element 2, etc. Such flexible adjustments and changes do not deviate from the principle and scope of the present invention and should be included in the protection scope of the present invention.

[0167] Preferably, the first end of the second end cover 32 is bonded to the membrane element 2 by means of an adhesive tape.

[0168] Preferably, if Fig.19 As shown, a plurality of guide ribs 324 are disposed inside the second end cover 32 , and the guide ribs 324 are used to guide the concentrated water in the concentrated water channel.

[0169] By providing the guide ribs 324 inside the second end cover 32 , the concentrate in the concentrate channel can be guided so that the concentrate in the circumferential direction of the membrane element 2 can flow to the concentrate outlet 323 more evenly.

[0170] It should be noted that, in practical applications, the present invention does not impose any limitation on the specific number of guide ribs 324. For example, the number of guide ribs 324 may be 3, or 4, or 6, etc. Such adjustment and change of the specific number of guide ribs 324 does not deviate from the principle and scope of the present invention and should be included in the protection scope of the present invention.

[0171] For example, Fig.19 As shown, the number of the guide ribs 324 of the present invention is 6.

[0172] It should be noted that, in actual applications, those skilled in the art may set the concentrate outlet 423 on the outer peripheral surface of the second end cover 32, or, may set the concentrate outlet 323 on the end surface of the second end cover 32 and spaced apart from the center tube 1, or, may set an annular flange 325 on the end surface of the first end cover 31 to form the concentrate outlet 423 between the annular flange 325 and the center tube 1, and so on. Such adjustments and changes to the specific setting position of the concentrate outlet 423 do not deviate from the principle and scope of the present utility model and should be included in the protection scope of the present utility model.

[0173] Preferably, if Fig.17 and Fig.19 As shown, the second end cover 32 is provided with an annular flange 325 matched with the central tube 1 , the central tube 1 passes through the annular flange 325 and extends to the outside of the second end cover 32 , and a concentrated water outlet 323 is formed between the annular flange 325 and the central tube 1 .

[0174] By such an arrangement, the concentrated water outlet 323 can be arranged to be located on the same end surface as the pure water outlet 12, so as to facilitate the water connection when the reverse osmosis membrane assembly is installed.

[0175] In addition, the utility model also provides a filtering device, which includes a housing 4 and any one of the reverse osmosis membrane components described above.

[0176] Specifically, Figures 14 to 17 As shown, the outer shell 4 is provided with a raw water inlet 421, a pure water outlet 422 and a concentrated water outlet 423, the reverse osmosis membrane assembly is located in the outer shell 4 and forms a raw water channel 44 with the outer shell 4, one end of the raw water channel 44 is connected to the raw water inlet 421, the other end of the raw water channel 44 is connected to the raw water port 212 through the raw water outlet, the pure water outlet 422 is connected to the pure water outlet 12, and the concentrated water outlet 423 is connected to the concentrated water channel 322.

[0177] Preferably, if Figures 14 to 17 As shown, the outer shell 4 includes a connected shell body 41 and a cover body 42, and the cover body 42 is provided with a raw water inlet 421, a pure water outlet 422 and a concentrated water outlet 423. The shell body 41, the second end cover 32 and the membrane element 2 together form a raw water flow channel 44 connected to the raw water inlet 421, and the cover body 42 is provided with a first sleeve 431 adapted to the central tube 1 and a second sleeve 432 adapted to the annular flange 325. When installed, the central tube 1 is located in the first sleeve 431 and connected to the pure water outlet 422, and the annular flange 325 is located between the first sleeve 431 and the second sleeve 432 and connected to the concentrated water flow channel 322 and the concentrated water outlet 423.

[0178] Through such an arrangement, the raw water flow channel 44 and the concentrated water flow channel 322 can be separated to avoid water cross-talk between the raw water and the concentrated water, so that the shell 41, the second end cover 32 and the membrane element 2 together form a raw water flow channel 44 connected to the raw water inlet 421. The raw water enters the raw water flow channel 44 through the raw water inlet 421 and then enters the raw water port 212 through the raw water inlet 312 on the first end cover 31. The concentrated water produced by filtration flows into the concentrated water flow channel 322 from the concentrated water port 231 and then flows out from the concentrated water outlet 423 through the concentrated water outlet 323. Pure water flows out from the central tube 1.

[0179] So far, the technical solution of the utility model has been described in conjunction with the preferred embodiments shown in the accompanying drawings, but it is easy for those skilled in the art to understand that the protection scope of the utility model is obviously not limited to these specific embodiments. Without departing from the principle of the utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the utility model.

Claims

1. A reverse osmosis membrane assembly, characterized in that: The reverse osmosis membrane assembly comprises: a center tube having a through hole; and A membrane element, which is wound on the outside of the central tube, the membrane element comprises at least two reverse osmosis membranes, a raw water channel is formed between the front sides of two adjacent reverse osmosis membranes, a pure water channel is formed between the back sides of two adjacent reverse osmosis membranes, the pure water channel has an opening toward the central tube and the opening is connected to the through hole, and the raw water channel has a raw water inlet and a concentrated water inlet; When the membrane element is in an unfolded state, the membrane element has a first end surface and a second end surface arranged adjacent to the central tube and a side edge arranged away from the central tube. The raw water inlet is located on the first end surface and its length is smaller than that of the first end surface, and the concentrated water inlet is arranged on the side and its length is smaller than that of the side.

2. The reverse osmosis membrane assembly according to claim 1, characterized in that: The ratio of the length of the raw water inlet to the length of the first end surface is 1 / 5 to 1 / 3.

3. The reverse osmosis membrane assembly according to claim 1, characterized in that: The raw water inlet is arranged at a position close to the central tube, and the concentrated water inlet is arranged at a position far away from the first end surface.

4. The reverse osmosis membrane assembly according to claim 1, characterized in that: The back of the reverse osmosis membrane is provided with a first glue line, a second glue line and a third glue line. Among them, the first glue line is located on the first end surface, the second glue line is located on the side, and the third glue line is located on the second end surface. The first glue line, the second glue line and the third glue line are connected in sequence to form the pure water channel.

5. The reverse osmosis membrane assembly according to claim 1, characterized in that: The back of the reverse osmosis membrane is provided with a first glue line and a second glue line, the first glue line is located on the first end surface and covers the raw water inlet, and the second glue line is located on the side. When the membrane element is in a wound state, the reverse osmosis membrane assembly also includes a first sealant and a second sealant, the first sealant is arranged on the first end face to form the raw water inlet, the second sealant is located on the second end face and seals the second end face, and the first glue line, the first sealant, the second glue line and the second sealant together form the pure water channel.

6. The reverse osmosis membrane assembly according to claim 5, characterized in that: The length of the first glue line is greater than the length of the original water outlet.

7. The reverse osmosis membrane assembly according to any one of claims 1 to 6, characterized in that: The reverse osmosis membrane assembly further comprises a first end cap, which is arranged close to the first end surface and is sealedly connected to the membrane element, and the first end cap is provided with a raw water inlet connected to the raw water inlet; And / or, the reverse osmosis membrane assembly also includes a second end cover, which is arranged on the second end face and can cover the concentrate outlet, one end of the second end cover is sealingly connected to the membrane element, and the other end of the second end cover is provided with an assembly hole for the central tube to pass through, and in the assembled state, the central tube passes through the second end of the second end cover and extends to the outside of the second end cover, and the end of the central tube away from the first end face forms a pure water outlet, a concentrate flow channel is formed between the membrane element and the second end cover, and the second end cover is provided with a concentrate outlet connected to the concentrate flow channel.

8. The reverse osmosis membrane assembly according to claim 7, characterized in that: The first end cover is provided with a diverter rib, and the diverter rib divides the raw water inlet into a plurality of raw water inlets.

9. The reverse osmosis membrane assembly according to claim 7, characterized in that: A plurality of guide ribs are arranged in the second end cover, and the guide ribs are used to guide the concentrated water in the concentrated water flow channel; And / or, the second end cover is provided with an annular flange matched with the central tube, the central tube passes through the annular flange and extends to the outside of the second end cover, and the concentrated water outlet is formed between the annular flange and the central tube.

10. A filtering device, characterized in that: The filtering device comprises a housing and a reverse osmosis membrane assembly according to any one of claims 7 to 9, Among them, the reverse osmosis membrane assembly is located in the outer shell, and a raw water flow channel is formed between the outer shell and the reverse osmosis membrane assembly. The outer shell is also provided with a raw water inlet, a pure water outlet and a concentrated water outlet. The raw water inlet is connected to the raw water flow channel, the concentrated water outlet is connected to the concentrated water outlet, and the pure water outlet is connected to the pure water outlet.

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