Reverse osmosis membrane assembly and filtering device comprising same

Abstract

The invention 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 of poor user experience caused by the problems of low flow rate 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. 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 increased, membrane pollution caused by deposition of pollutants on the membrane is avoided, and the service life is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water purification equipment, and particularly provides a reverse osmosis membrane assembly and a filtering device comprising the same. BACKGROUND

[0002] With the improvement of people's living standards, people's demand for drinking water is also getting higher and higher. Water purification equipment such as water purifiers has gradually become an essential drinking water facility in people's daily life.

[0003] At present, the water purifiers on the market are faced with the problems of small flow and short service life, which leads to slow water output speed and frequent replacement of filter cartridges, affecting the user experience. How to improve the flow of the filter cartridge and prolong the service life of the filter cartridge is the biggest problem in the industry.

[0004] The present application urgently needs to provide a filter cartridge capable of improving flow rate, slowing down the pollution rate of the membrane and prolonging the service life. SUMMARY

[0005] The present application aims to at least partially solve the above technical problems, i.e., at least partially solve the problem that the existing filter cartridge has low flow rate and short service life, resulting in poor user experience.

[0006] In a first aspect, the present application provides a reverse osmosis membrane assembly, comprising: a center tube having a through hole; and a membrane element wound on the outside of the center tube, the membrane element comprising at least two reverse osmosis membrane sheets, a raw water channel being formed between the front surfaces of two adjacent reverse osmosis membrane sheets, a pure water channel being formed between the back surfaces of two adjacent reverse osmosis membrane sheets, the pure water channel having an opening towards the center tube and the opening being in communication with the through hole, the raw water channel having a raw water port and a concentrated water port; in a deployed state of the membrane element, the membrane element has a first end surface and a second end surface disposed adjacent to the center tube, and a side edge disposed away from the center tube, wherein the raw water port is located on the first end surface and the length of the raw water port is less than the length of the first end surface, and the concentrated water port is disposed on the side edge and the length of the concentrated water port 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 port to the length of the first end surface is 1 / 5-1 / 3.

[0008] In the preferred technical solution of the above reverse osmosis membrane assembly, the raw water port is disposed close to the center tube, and the concentrated water port is disposed away from the first end surface.

[0009] In the preferred technical scheme of the reverse osmosis membrane assembly, the back surface of the reverse osmosis membrane sheet is provided with a first glue line, a second glue line and a third glue line, the first glue line is located on the first end surface, the second glue line is located on the side edge, and the third glue line is located on the second end surface, and the first glue line, the second glue line and the third glue line are sequentially connected to form the pure water channel.

[0010] In the preferred technical scheme of the reverse osmosis membrane assembly, the back surface of the reverse osmosis membrane sheet 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 port, and the second glue line is located on the side edge, and in the winding state of the membrane element, the reverse osmosis membrane assembly further comprises a first sealing glue and a second sealing glue, the first sealing glue is arranged on the first end surface to form the raw water port, and the second sealing glue is arranged on the second end surface to seal the second end surface, and the first sealing glue, the first glue line, the second glue line and the second sealing glue jointly enclose the pure water channel.

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

[0012] In the preferred technical scheme of the reverse osmosis membrane assembly, the reverse osmosis membrane assembly further comprises a first end cover, the first end cover is arranged close to the first end surface and is sealingly connected with the membrane element, and the first end cover is provided with a raw water water inlet port which communicates with the raw water port; and / or, the reverse osmosis membrane assembly further comprises a second end cover, the second end cover is arranged on the second end surface and can cover the concentrated water port, one end of the second end cover is sealingly connected with the membrane element, the other end of the second end cover is provided with an assembly hole through which the center tube passes, in the assembled state, the center tube passes through the second end of the second end cover and extends to the outside of the second end cover, the end of the center tube away from the first end surface forms a pure water outlet port, the 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 port which communicates with the concentrated water flow channel.

[0013] In the preferred technical scheme of the reverse osmosis membrane assembly, the first end cover is provided with a flow dividing rib, and the flow dividing rib divides the raw water water inlet port into a plurality of raw water inlet ports.

[0014] In the preferred technical scheme of the reverse osmosis membrane assembly, the second end cover is provided with a plurality of flow guiding ribs, and the flow guiding ribs are used for guiding the concentrated water in the concentrated water flow channel; and / or, the second end cover is provided with an annular flange which is matched with the center tube, the center tube passes through the annular flange and extends to the outside of the second end cover, and the annular flange and the center tube form the concentrated water outlet port.

[0015] In a second aspect, the present invention also provides a filtration device, the filtration device comprising a housing and a reverse osmosis membrane assembly as described in any of the above descriptions, wherein the reverse osmosis membrane assembly is located inside the housing, a raw water flow channel is formed between the housing and the reverse osmosis membrane assembly, and the housing is further provided with a raw water inlet, a pure water outlet and a concentrated water outlet, the raw water inlet being connected to the raw water flow channel, the concentrated water outlet being connected to the concentrated water outlet, and the pure water outlet being connected to the pure water outlet.

[0016] When the above-mentioned preferred technical solution is adopted, by setting the raw water inlet on the first end face and the concentrate 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 module for raw water. By setting the length of the raw water inlet to be less 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 fouling, extending the service life of the reverse osmosis membrane module, and greatly improving the user experience.

[0017] Furthermore, compared to existing reverse osmosis membrane modules, the length L of the raw water inlet is reduced. y Setting the ratio between the length L of the first end face and the raw water flow rate to 1 / 5≤a≤1 / 3 can increase the flow rate of the raw water by 3 to 5 times. At the same time, it can also avoid the raw water inlet being too small, which would affect the water production efficiency of the reverse osmosis membrane module and further improve the user experience.

[0018] Furthermore, compared to the method of setting a first adhesive line, a second adhesive line, and a third adhesive line on the back of the reverse osmosis membrane and connecting the first adhesive line, the second adhesive line, and the third adhesive line in sequence to form a pure water channel, the method of forming a pure water channel by using the first adhesive line, the first sealant, the second adhesive line, and the second sealant can effectively reduce the area occupied by the adhesive lines on the reverse osmosis membrane, resulting in a larger filtration area, higher filtration efficiency, and a better user experience for the reverse osmosis membrane module.

[0019] Furthermore, by setting a first end cap and a flow divider on the first end cap, the raw water can enter the raw water channel more evenly through the raw water inlet, thereby further increasing the effective filtration area of ​​the reverse osmosis membrane and improving the filtration efficiency of the reverse osmosis membrane module.

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

[0021] Furthermore, the filtration device provided by the present invention, based on the above technical solution, includes the reverse osmosis membrane module described above, and thus possesses the beneficial effects of the reverse osmosis membrane module. Compared with the filtration device before the improvement, the filtration device of the present invention has a higher water output speed, higher filtration efficiency, longer service life, and a better user experience. Attached Figure Description

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

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

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

[0025] Figure 3 yes Figure 1 Schematic diagram of the waterway flow direction of the Central Plains Waterway;

[0026] Figure 4 This is a schematic diagram of the reverse osmosis membrane module of the present invention. Figure 1 The diagram shows the positional relationship of each component in the winding state;

[0027] Figure 5 This is a schematic diagram of the reverse osmosis membrane module of the present invention. Figure 2 The diagram shows the positional relationship of each component in the winding state;

[0028] Figure 6 This is a schematic diagram of the reverse osmosis membrane module according to Embodiment 1 of the present invention, which shows the positional relationship of each component in the deployed state;

[0029] Figure 7 This is a schematic diagram of the reverse osmosis membrane and central tube according to Embodiment 1 of the present invention;

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

[0031] Figure 9 yes Figure 7 Schematic diagram of the waterway flow direction of the Central Plains Waterway;

[0032] Figure 10 This is a schematic diagram of the reverse osmosis membrane module according to Embodiment 2 of the present invention, which shows the positional relationship of each component in the unfolded state;

[0033] Figure 11 This is a schematic diagram of the reverse osmosis membrane and central tube according to Embodiment 2 of the present invention;

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

[0035] Figure 13 yes Figure 11 Schematic diagram of the waterway flow direction of the Central Plains Waterway;

[0036] Figure 14 This is a schematic diagram of the structure of the filtration device of the present invention. Figure 1 ;

[0037] Figure 15 This is a schematic diagram of the structure of the filtration device of the present invention. Figure 2 ;

[0038] Figure 16 This is a schematic diagram of the structure of the filtration device of the present invention. Figure 3 ;

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

[0040] Figure 18 This is a schematic diagram of the structure of the first end cap of the present invention;

[0041] Figure 19 This is a schematic diagram of the structure of the second end cap of the present invention.

[0042] List of reference numerals in the attached diagram:

[0043] 1. Central tube; 11. Through hole; 12. Pure water outlet; 2. Membrane element; 201. Raw water channel; 2011. Concentrate guide net; 202. Pure water channel; 2021. Pure water guide net; 21. First end face; 211. First sealant; 212. Raw water inlet; 22. Second end face; 221. Second sealant; 23. Side; 231. Concentrate inlet; 24. Reverse osmosis membrane; 2401. Front; 2402. Back; 241. First adhesive line; 242. Second adhesive line; 243. 1. Third adhesive line; 25. Waterproof tape; 251. Water passage hole; 31. First end cap; 311. Diverter rib; 312. Raw water inlet; 32. Second end cap; 321. Assembly hole; 322. Concentrate channel; 323. Concentrate outlet; 324. Guide rib; 325. Annular flange; 4. Outer shell; 41. Shell; 42. Cover; 421. Raw water inlet; 422. Pure water outlet; 423. Concentrate outlet; 431. First sleeve; 432. Second sleeve; 44. Raw water channel. Detailed Implementation

[0044] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0045] It should be noted that in the description of this invention, terms such as "upper," "lower," "inner," and "outer," which indicate direction or positional relationships, are based on the direction or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0046] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "setting," and "connection" should be interpreted broadly, for example, referring to a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0047] like Figure 6 , Figure 7 , Figure 10 and Figure 11 As shown, the reverse osmosis membrane assembly of the present invention includes 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 around 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 faces 2401 of two adjacent reverse osmosis membranes 24, and a pure water channel 202 is formed between the back faces 2402 of two adjacent reverse osmosis membranes 24. The pure water channel 202 has a pure water outlet facing 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 deployed state, the membrane element 2 has a first end face 21 and a second end face 22 adjacent to the central tube 1 and a side 23 away from the central tube 1. The raw water channel 201 has a raw water inlet 212 and a concentrate inlet 231. The raw water inlet 212 is located on the first end face 21 and the length of the raw water inlet 212 is less than the length of the first end face 21. The concentrate inlet 231 is located on the side 23 and the length of the concentrate inlet 231 is less than the length of the side 23.

[0050] With this configuration, on the one hand, by placing the raw water inlet 212 on the first end face 21 and the concentrate outlet 231 on the side 23, the flow rate of raw water within the raw water channel 201 can be increased, thereby improving the filtration efficiency of the reverse osmosis membrane module for raw water. On the other hand, by setting the length of the raw water inlet 212 to be less than the length of the first end face 21, the size of the raw water inlet 212 can be reduced, which can effectively increase the flow rate of raw water, prevent contaminants from depositing on the membrane and causing membrane fouling, extend the service life of the reverse osmosis membrane module, and greatly improve the user experience.

[0051] It should be noted that, in practical applications, those skilled in the art can configure the membrane element 2 to include two reverse osmosis membrane sheets 24, or the membrane element 2 can be configured to include multiple reverse osmosis membrane sheets 24, etc. Such adjustments and changes to the specific number of reverse osmosis membrane sheets 24 do not deviate from the principles and scope of the present invention, and should all be included within the protection scope of the present invention.

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

[0053] By configuring the membrane element 2 to include multiple reverse osmosis membrane sheets 24, the filtration efficiency of the reverse osmosis membrane module can be improved, thereby increasing the flux of the reverse osmosis membrane module.

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

[0055] It should also be noted that, in practical applications, those skilled in the art can fold the reverse osmosis membrane along opposite sides to form a reverse osmosis membrane sheet 24, and then attach the folded edge to the central tube 1. Alternatively, one side of multiple reverse osmosis membrane sheets 24 can be directly attached to the central tube 1, etc. Such adjustments and changes to the specific formation method of multiple reverse osmosis membrane sheets 24 of the membrane element 2 do not deviate from the principle and scope of the present invention, and should all be included within the protection scope of the present invention.

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

[0057] It should be noted that, in practical applications, those skilled in the art can configure the central tube 1 to be blocked at one end and form a pure water outlet 12 at the other end, or to form pure water outlets 12 at both ends of the central tube 1, etc. Such adjustments and changes to the specific configuration of the central tube 1 do not deviate from the principles and scope of the present invention and should be included within the protection scope of the present invention.

[0058] Preferably, the end of the central tube 1 closest to the first end face 21 is blocked, and the end of the central tube 1 furthest from the first end face 21 forms a pure water outlet 12.

[0059] It should be noted that, in practical applications, those skilled in the art can set the raw water inlet 212 on the first end face 21 near the central pipe 1, or they can set the raw water inlet 212 on the first end face 21 away from the central pipe 1, etc. 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 invention, and should all be included within the protection scope of the present invention.

[0060] Preferably, such as Figure 7 , Figure 9 , Figure 11 and Figure 13 As shown, the raw water inlet 212 is located on the first end face 21 near the central pipe 1.

[0061] By setting the raw water inlet 212 closer to the central pipe 1 on the first end face 21, compared to setting the raw water inlet 212 on the first end face 21 away from the central pipe 1, the flow path of the raw water in the raw water channel 201 can be further extended, thereby further improving the filtration efficiency of the reverse osmosis membrane module.

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

[0063] like Figure 9 and Figure 13 As shown, with membrane element 2 in the deployed state, the length of the raw water inlet 212 is set to L. y The length of the first end face 21 is L, and the length of the original water inlet 212 is L. y The ratio between the length L of the first end face 21 and the length L of the first end face 21 is set to a.

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

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

[0066] With this setup, compared to existing reverse osmosis membrane modules, the length L of the raw water inlet 212 is reduced. y The ratio between the length L of the first end face 21 and the length L 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, which would affect the water production efficiency of the reverse osmosis membrane module and further improve the user experience.

[0067] Let the flow rate of water passing through the original water inlet 212 be Q. y The flow velocity 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 thickness D of the gap between the membrane bag and the membrane bag, wherein a membrane bag is formed between two adjacent reverse osmosis membranes.

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

[0069] The following is based on We will take this as an example and then explain it in detail in the following two scenarios.

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

[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 module is located on the first end face 21, and the length L of the raw water inlet 212 is... y1 The length L of the first end face 21 is equal to that of the second end face 22. 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. Since the length of the first end face 21 is equal to the length 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 thickness of the gap between the membrane bags is D, and the length of the concentrate outlet 231 is L. n1The cross-sectional area of ​​the concentrated water outlet 231 is S. n1 The concentrate flow rate is Q. n1 The pure water flow rate is Q. c1 The flow velocity at the original water inlet 212 is set to V. y1 The concentrated water flow velocity is V n1 .

[0074]

[0075]

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

[0077] So,

[0078]

[0079] Furthermore, due to the length L of the original water inlet 212 y1 =L, then

[0080]

[0081] Furthermore, due to the length L of the concentrated water outlet 231 n1 =L, then

[0082]

[0083] With a net 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] Substitute formula (7) into formula (6),

[0086] get:

[0087] set up

[0088] Then the original water flow velocity V y1 =V0, concentrate 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 the same as the water flow rate of the raw water inlet 212 in the prior art, i.e., 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, and the width of the reverse osmosis membrane 24 is W. Let L = 2 × W. In this embodiment, the flow velocity at the raw water inlet 212 is V. y2 The length of the concentrated water outlet 231 is L. n2 Furthermore, the length of the concentrate outlet is half that of the side, and the cross-sectional area of ​​concentrate outlet 231 is S. n2 The concentrate flow rate is Q. n2 The pure water flow rate is Q. c2 .

[0091]

[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 y2 The ratio between the length L of the first end face 21 and the length L of the first end face 21 is but

[0097]

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

[0099] get:

[0100] And Q y2 =Q y1 ,

[0101] So, V y2 =5×V0

[0102] Furthermore, due to the length of the concentrated water outlet 231 L = 2 × W

[0103] but

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

[0105] Right now:

[0106] With a net 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 get:

[0109]

[0110] And Q y2 =Q y1 ,

[0111] Then V n2 =V0.

[0112] In summary, the raw water flow rate V of the existing reverse osmosis membrane module (Scenario 1) is... y1 =V0, the raw water flow rate V of the reverse osmosis membrane module (case 2) of the present invention. y2 =5×V0, thus it can be seen that the raw water flow rate of the present invention is significantly improved compared with the prior art. At the same time, the concentrate flow rate of the reverse osmosis membrane module (case 1) in the prior art is significantly lower. The concentrate flow rate V of the reverse osmosis membrane module (Case 2) of the present invention n2 =V0, thus it can be seen that the concentrate flow rate of the present invention is significantly improved compared with the prior art.

[0113] Therefore, compared with the prior art, the flow rate of the raw water inlet 212 of the reverse osmosis membrane module of the present invention is 5 times that of the raw water inlet 212 in the prior art, which greatly increases the raw water flow rate of the reverse osmosis membrane module and thus increases the water production speed of the reverse osmosis membrane module.

[0114] It should be noted that, in practical applications, those skilled in the art can apply sealant to the second end face 22 after the membrane element 2 is wound to seal the second end face 22. Alternatively, sealant can be applied between two adjacent reverse osmosis membrane sheets 24 on the second end face 22 before winding the membrane element 2 to seal the second end face 22. Or, sealant can be applied between two adjacent reverse osmosis membrane sheets on the second end face 22 before winding the membrane element 2, and then applied to the second end face 22 after winding the membrane element 2 to seal the second end face 22, etc. Such adjustments and changes to the sealing method of the second end face 22 do not deviate from the principles and scope of the present invention and should all be included within the protection scope of the present invention.

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

[0116] It should be noted that, in practical applications, those skilled in the art can apply sealant to the side of the first end face 21 away from the central tube 1 after the membrane element 2 is wound to form the raw water inlet 212 on the first end face 21. Alternatively, sealant can be applied between two adjacent reverse osmosis membranes at the end of the first end face 21 away from the central tube 1 before the membrane element 2 is wound to form the raw water inlet 212 on the first end face 21. Or, sealant can be applied between two adjacent reverse osmosis membranes at the end of the first end face 21 away from the central tube 1 before the membrane element 2 is wound, and then sealant can be applied to the side of the first end face 21 away from the central tube 1 after the membrane element 2 is wound to form the raw water inlet 212 on the first end face 21.

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

[0118] It should be noted that, in practical applications, the present invention does not impose any limitations on the specific formation method of the pure water channel between the back surfaces 2402 of two adjacent reverse osmosis membranes 24, as long as the pure water channel between the back surfaces 2402 of two adjacent reverse osmosis membranes 24 is formed. Such adjustments and changes to the specific formation method of the pure water channel do not deviate from the principle and scope of the present invention and should be included within the protection scope of the present invention.

[0119] The reverse osmosis membrane module of the present invention will be described below with reference to the following two embodiments.

[0120] Example 1:

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

[0122] Before winding the membrane element 2, a first adhesive line 241, a second adhesive line 242, and a third adhesive line 243 are applied to the back surfaces 2402 of two adjacent reverse osmosis membrane sheets 24 to form a pure water channel 202 between the back surfaces 2402 of the two adjacent reverse osmosis membrane sheets 24. After the membrane element 2 is wound, a first sealant 211 is applied to 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. A second sealant 221 is applied to the second end face 22 to seal the second end face 22, thus completing the fabrication of the reverse osmosis membrane module.

[0123] Example 2:

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

[0125] Before winding the membrane element 2, first adhesive lines 241 and second adhesive lines 242 are applied to the back side 2402 of two adjacent reverse osmosis membrane sheets 24. After the membrane element 2 is wound, first sealant 211 is applied to the side of the first end face 21 away from the central tube 1 to form the raw water inlet 212 on the first end face 21. Second sealant 221 is applied to the second end face 22 to seal the second end face 22, thus completing the fabrication of the reverse osmosis membrane module.

[0126] It should be noted that, in practical applications, those skilled in the art can set the length of the first adhesive line 241 to be equal to the length of the original sprue 212, or the length of the first adhesive line 241 can be set to be greater than the length of the original sprue 212, etc. Such adjustments and changes to the specific length of the first adhesive line 241 do not deviate from the principle and scope of the present invention and should be included within the protection scope of the present invention.

[0127] Preferably, the length of the first adhesive line 241 is greater than the length of the original sprue 212.

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

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

[0130] The following is combined with Figure 8 and Figure 12 A detailed introduction will be provided.

[0131] (1) Calculation of the percentage of the total area of ​​the film occupied by the adhesive line 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 50cm, the width of the membrane element 2 (the length of the side 23) is W=25cm, the width of the adhesive line on the first end face 21 is H1=3cm, the width of the adhesive line on the second end face 22 is H2=3cm, and the width of the adhesive line on the side 23 is H3=3cm.

[0133] The total area of ​​the diaphragm is S = L × W = (50 × 25) cm² 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. However, since the first adhesive line 241 has already been applied to this position, the position corresponding to the original water inlet cannot be effectively utilized even though the first sealant 211 is not set there. In the calculation, this area is regarded as the area occupied by the adhesive line.

[0135] Therefore, the area occupied by the adhesive line is 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 adhesive lines on a single membrane sheet prepared in Example 1.

[0139] K1 = 28.56%.

[0140] (2) Calculation of the percentage of the total area of ​​the film occupied by the adhesive line in Example 2:

[0141] Specifically, such as Figure 12 As shown, the length L of membrane element 2 is set to 50cm, the width W of membrane element 2 is set to 25cm, the width H1 of the adhesive line on the first end face 21 is set to 3cm, and the length of the adhesive line on the first end face 21 (i.e., the first adhesive line 241) is set to... The width of the adhesive line on the second end face 22 is H2 = 0.5cm, and the width of the adhesive line on the side 23 is H3 = 3cm.

[0142] The total area of ​​the diaphragm is S = L × W = (50 × 25) cm² 2 =1250cm 2 .

[0143] It should be noted that, although Figure 12 The first sealant 211 is not set at the position corresponding to the original water inlet 212. However, since the first sealant 211 has already been applied to this position, the position corresponding to the original water inlet 212 cannot be effectively utilized even though the first sealant 211 is not set there. In the calculation, this area is regarded as the area occupied by the glue line.

[0144] Area of ​​the adhesive line

[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 = 177cm 2 .

[0147] Percentage of the total area of ​​the film occupied by the adhesive lines

[0148] K2 = 14.16%.

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

[0150] Therefore, compared with the glue application method shown in Example 1, the glue application method shown in Example 2 for forming 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 module prepared by the glue application method shown in Example 2 is increased by 14.4%.

[0151] Preferably, such as Figure 8 and Figure 10 As shown, a concentrate guide net 2011 is provided between the front surfaces 2401 of two adjacent reverse osmosis membranes 24.

[0152] By setting up the concentrate guide net 2011, the concentrate in the raw water channel 201 can be guided, so that the concentrate produced by filtration in the raw water channel 201 flows evenly to the concentrate outlet 231.

[0153] It should be noted that, in practical applications, those skilled in the art can set only one concentrate guide net 2011, or two concentrate guide nets 2011, or multiple concentrate guide nets 2011, etc. Such adjustments and changes to the specific number of concentrate guide nets 2011 do not deviate from the principles and scope of the present invention, and should all be included within the protection scope of the present invention.

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

[0155] Preferably, such as Figure 8 and Figure 10 As shown, a pure water guide net 2021 is provided between the back surfaces 2402 of two adjacent reverse osmosis membranes 24.

[0156] By setting up the pure water guide net 2021, the pure water in the pure water channel 202 can be guided, so that the pure water in the pure water channel 202 flows evenly to the pure water outlet.

[0157] It should be noted that, in practical applications, those skilled in the art can set only one pure water guide net 2021, or two, or multiple, etc. Such adjustments and changes to the specific number of pure water guide nets 2021 do not deviate from the principles and scope of the present invention and should all be included within the protection scope of the present invention.

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

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

[0160] Preferably, such as Figure 15 and Figure 17 As shown, the reverse osmosis membrane module of the present invention further includes a first end cap 31, wherein the first end cap 31 is disposed near the first end face 21 and is sealed to the membrane element 2, and the first end cap 31 is provided with a raw water outlet for raw water to pass through at a position corresponding to the raw water outlet 212.

[0161] Preferably, such as Figure 18 As shown, the first end cap 31 is provided with a flow divider 311, which divides the raw water inlet into multiple raw water inlets 312.

[0162] This configuration allows raw water to enter the raw water inlet 212 more evenly, and then enter the membrane element 2 more evenly to filter the raw water, thereby further improving the filtration efficiency of the reverse osmosis membrane module.

[0163] It should be noted that, in practical applications, those skilled in the art can configure the first end cap 31 to be sealed to the first end face 21 by tape, or the first end cap 31 can be sealed to the first end face 21 by applying glue, etc. Such adjustments and changes to the specific connection method between the first end cap 31 and the first end face 21 do not deviate from the principle and scope of the present invention, and should all be included within the protection scope of the present invention.

[0164] Preferably, such as Figure 15 and Figure 17 As shown, the reverse osmosis membrane module of the present invention further includes a second end cap 32, wherein the second end cap 32 is disposed on the second end face 22 and covers the concentrate outlet 231. One end of the second end cap 32 is sealed to the membrane element 2, and the other end of the second end cap 32 is provided with an assembly hole 321 for the central tube 1 to pass through. When assembled, the central tube 1 passes through the assembly hole 321 and extends to the outside of the second end cap 32. A pure water outlet is formed inside the central tube 1, and a concentrate channel 322 is formed between the second end cap 32 and the membrane element 2. The second end cap 32 is also provided with a concentrate outlet 323 communicating with the concentrate channel 322.

[0165] By setting the second end cap 32, the concentrated water produced by filtration in the raw water channel can be discharged through the concentrated water outlet 231 into the concentrated water flow channel 322, and then flow out through the concentrated water outlet 323 on the second end cap 32, thus facilitating the discharge of concentrated water.

[0166] It should be noted that, in practical applications, those skilled in the art can configure the first end of the second end cap 32 to be bonded to the membrane element 2 with adhesive tape, or a sealed connection can be achieved by applying adhesive between the second end cap 32 and the membrane element 2, etc. Such flexible adjustments and changes do not deviate from the principles and scope of the present invention and should all be included within the protection scope of the present invention.

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

[0168] Preferably, such as Figure 19 As shown, the interior of the second end cap 32 is provided with a plurality of guide ribs 324, which are used to guide the concentrated water in the concentrated water channel.

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

[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 can be set to 3, 4, or 6, etc. Such adjustments and changes to the specific number of guide ribs 324 do not deviate from the principles and scope of the present invention and should be included within the protection scope of the present invention.

[0171] For example, such as Figure 19 As shown, the number of guide ribs 324 in this invention is 6.

[0172] It should be noted that, in practical applications, those skilled in the art can arrange the concentrate outlet 423 on the outer peripheral surface of the second end cap 32, or arrange the concentrate outlet 323 on the end face of the second end cap 32 and spaced apart from the central tube 1, or arrange an annular flange 325 on the end face of the first end cap 31, forming the concentrate outlet 423 between the annular flange 325 and the central tube 1, etc. Such adjustments and changes to the specific location of the concentrate outlet 423 do not deviate from the principles and scope of the present invention and should all be included within the protection scope of the present invention.

[0173] Preferably, such as Figure 17 and Figure 19 As shown, the second end cap 32 is provided with an annular flange 325 that is adapted to the central tube 1. The central tube 1 passes through the annular flange 325 and extends to the outside of the second end cap 32. A concentrated water outlet 323 is formed between the annular flange 325 and the central tube 1.

[0174] With this configuration, the concentrate outlet 323 can be located on the same end face as the pure water outlet 12, which facilitates the water connection during the installation of the reverse osmosis membrane module.

[0175] In addition, the present invention also provides a filtration device, which includes a housing 4 and any of the reverse osmosis membrane components described above.

[0176] Specifically, such as Figures 14 to 17 As shown, the outer casing 4 is provided with a raw water inlet 421, a pure water outlet 422, and a concentrated water outlet 423. The reverse osmosis membrane module is located inside the outer casing 4 and forms a raw water channel 44 with the outer casing 4. One end of the raw water channel 44 is connected to the raw water inlet 421, and the other end of the raw water channel 44 is connected to the raw water outlet 212 through the raw water inlet. 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, such as Figures 14 to 17 As shown, the outer shell 4 includes a shell 41 and a cover 42 connected together. The cover 42 is provided with a raw water inlet 421, a pure water outlet 422 and a concentrated water outlet 423. The shell 41, the second end cap 32 and the membrane element 2 together form a raw water channel 44 that communicates with the raw water inlet 421. The cover 42 is provided with a first sleeve 431 that is adapted to the central tube 1 and a second sleeve 432 that is adapted to the annular flange 325. When installed, the central tube 1 is located inside the first sleeve 431 and connected to the pure water outlet 422. The annular flange 325 is located between the first sleeve 431 and the second sleeve 432 and communicates with the concentrated water channel 322 and the concentrated water outlet 423.

[0178] With this configuration, the raw water channel 44 and the concentrated water channel 322 can be separated to prevent cross-contamination between the raw water and the concentrated water. The shell 41, the second end cap 32, and the membrane element 2 together form the raw water channel 44, which is connected to the raw water inlet 421. The raw water enters the raw water channel 44 through the raw water inlet 421 and then enters the raw water outlet 212 through the raw water inlet 312 on the first end cap 31. The concentrated water produced by filtration flows into the concentrated water channel 322 from the concentrated water outlet 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] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A reverse osmosis membrane module, characterized by, The reverse osmosis membrane assembly comprises: a center tube having a through hole; and a membrane element wound outside the center tube, the membrane element comprising at least two reverse osmosis membrane sheets, a raw water channel being formed between the front surfaces of two adjacent reverse osmosis membrane sheets, a pure water channel being formed between the back surfaces of two adjacent reverse osmosis membrane sheets, the pure water channel having an opening towards the center tube and the opening being in communication with the through hole, the raw water channel having a raw water port and a concentrated water port; 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 center tube and a side edge arranged away from the center tube, wherein the raw water port is located on the first end surface and the length of the raw water port is less than the length of the first end surface, the concentrated water port is arranged on the side edge and the length of the concentrated water port is less than the length of the side edge.

2. The reverse osmosis membrane module of claim 1, wherein, The ratio of the length of the raw water port to the length of the first end surface is 1 / 5-1 / 3.

3. The reverse osmosis membrane module of claim 1, wherein, The raw water port is arranged close to the center tube, and the concentrated water port is arranged away from the first end surface.

4. The reverse osmosis membrane module of claim 1, wherein, The back surface of the reverse osmosis membrane sheet is provided with a first glue line, a second glue line and a third glue line, wherein the first glue line is located on the first end surface, the second glue line is located on the side edge, and the third glue line is located on the second end surface, and the first glue line, the second glue line and the third glue line are sequentially connected to form the pure water channel.

5. The reverse osmosis membrane module of claim 1, wherein, The back surface of the reverse osmosis membrane sheet 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 port, and the second glue line is located on the side edge, when the membrane element is in a wound state, the reverse osmosis membrane assembly further comprises a first sealing glue and a second sealing glue, the first sealing glue is arranged on the first end surface to form the raw water port, and the second sealing glue is located on the second end surface and seals the second end surface, and the first glue line, the first sealing glue, the second glue line and the second sealing glue jointly enclose the pure water channel.

6. The reverse osmosis membrane module of claim 5, wherein, The length of the first glue line is greater than the length of the raw water port.

7. The reverse osmosis membrane module according to any one of claims 1 to 6, wherein, The reverse osmosis membrane assembly further comprises a first end cover arranged close to the first end surface and sealingly connected with the membrane element, and the first end cover is provided with a raw water water passing port in communication with the raw water port; and / or, the reverse osmosis membrane assembly further comprises a second end cover arranged on the second end surface and capable of covering the concentrated water port, one end of the second end cover is sealingly connected with the membrane element, the other end of the second end cover is provided with a fitting hole for the center tube to pass through, in the assembled state, the center tube passes through the second end of the second end cover and extends to the outside of the second end cover, the end of the center tube away from the first end surface 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 in communication with the concentrated water flow channel.

8. The reverse osmosis membrane module of claim 7, wherein, The first end cover is provided with a flow dividing rib, and the flow dividing rib separates the raw water water passing port into a plurality of raw water inlets.

9. The reverse osmosis membrane module of claim 7, wherein, A plurality of flow guide ribs are arranged in the second end cover, and the flow guide ribs are used for guiding the concentrated water in the concentrated water flow channel; And / or, an annular flange is arranged on the second end cover and is matched with the center pipe, the center pipe passes through the annular flange and extends to the outside of the second end cover, and the annular flange and the center pipe form the concentrated water outlet.

10. A filter device, characterized in that The filter device comprises a shell and the reverse osmosis membrane assembly according to any one of claims 7 to 9, Wherein, the reverse osmosis membrane assembly is located in the shell, a raw water flow channel is formed between the shell and the reverse osmosis membrane assembly, a raw water inlet, a pure water outlet and a concentrated water outlet are further arranged on the shell, the raw water inlet is communicated with the raw water flow channel, the concentrated water outlet is communicated with the concentrated water outlet, and the pure water outlet is communicated with the pure water outlet.

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