Pressure assisted osmosis apparatus and osmotic membrane module thereof

Abstract

This application discloses a pressure-assisted osmosis device and its membrane assembly, which includes a central tube and several membrane rolls. The central tube comprises an outer central tube, an inner central tube, and several dividing ribs. The dividing ribs divide the space between the outer central tube and the inner central tube into several peripheral channels. The outer central tube has a second type of through-hole to connect the peripheral channels with the outside of the outer central tube. The dividing ribs have at least a portion of a first type of through-hole. Both the central channel and the peripheral channels extend along a central axis, with the peripheral channels formed on the opposite outer side of the central channel. The first type of through-hole extends from the inner wall of the inner central tube through the dividing ribs to the outer wall of the outer central tube. The two openings of a membrane bag are respectively connected to the openings of a first type of through-hole and a second type of through-hole at the outer central tube. The advantage of this application is that it provides a pressure-assisted osmosis device and its membrane assembly with a reasonable structure that is easy to assemble and disassemble.

Description

Technical Field

[0001] This application relates to the field of permeation membrane technology, and more specifically, to a pressure-assisted permeation device and its permeation membrane assembly. Background Technology

[0002] Forward osmosis (RO) technology utilizes the difference in osmotic pressure generated by solutions of different types and concentrations. When solutions of different concentrations are placed on both sides of a semipermeable membrane, the solution with lower concentration (osmotic pressure) will automatically permeate to the side with higher osmotic pressure. This membrane treatment technology features low operating pressure and low energy consumption. However, it also presents the problem of requiring secondary treatment and reuse of the draw solution.

[0003] Reverse osmosis, also known as reverse osmosis, is a membrane separation process that uses a pressure difference to separate the solvent from a solution. Pressure is applied to the feed solution on one side of the membrane. When the pressure exceeds the osmotic pressure, the solvent will permeate in the opposite direction of natural osmosis. Thus, the permeated solvent, or permeate, is obtained on the low-pressure side of the membrane, while the concentrated solution, or concentrate, is obtained on the high-pressure side. Reverse osmosis eliminates the draw solution issue, but it requires higher operating pressures and consumes more energy.

[0004] Pressure-assisted osmosis technology (pressure-assisted forward osmosis and osmotic pressure-assisted reverse osmosis) is a technology that combines the advantages of both forward and reverse osmosis technologies.

[0005] In simple terms, it is actually a combination of forward osmosis and reverse osmosis technologies derived from forward osmosis technology. In practical applications, it can achieve some operating effects that conventional forward osmosis and reverse osmosis systems cannot achieve. In terms of membrane structure itself, pressure-assisted osmosis membranes are basically the same as forward osmosis membranes, or it can be said that pressure-assisted osmosis is an application of forward osmosis.

[0006] However, although pressure-assisted permeation technology has many advantages, its application is not widespread. This may be due to some structural design deficiencies, which result in poor practical operability.

[0007] In some related technologies, the traditional spiral wound forward osmosis technology mentioned in "Basic Principles and Applications of Forward Osmosis" (Related Technology 1), written by Sun Haoqing et al. and translated and annotated by He Tao, Li Xuemei et al., has an extremely complex central tube design that is not concentric with the membrane body, which makes actual installation and operation extremely difficult.

[0008] In other related technologies, such as Chinese patent document CN201578990U (related technology 2), a spiral-wound dual-channel permeation membrane module is described, which proposes the concept of dual channels with a central channel and a peripheral channel. However, it only conceives the technical principle and does not provide a specific engineering implementation plan. Summary of the Invention

[0009] The summary section of this application is intended to provide a brief overview of the concepts, which will be described in detail in the detailed description section below. This summary section is not intended to identify key or essential features of the claimed technical solutions, nor is it intended to limit the scope of the claimed technical solutions.

[0010] Some embodiments of this application propose a pressure-assisted permeation device and its permeation membrane assembly to solve the technical problems mentioned in the background section above.

[0011] As a first aspect of this application, some embodiments of this application provide a permeation membrane assembly, including: a central tube extending along a central axis and having at least a central channel, a first type of through hole, a peripheral channel, and a second type of through hole; a plurality of membrane rolls, each consisting of a membrane bag whose interior is respectively connected to the central channel and the peripheral channel; wherein the central tube includes: a central outer tube forming the outer wall of the central tube as a whole; a central inner tube disposed inside the central outer tube and forming the central channel; a plurality of partition ribs disposed between the central outer tube and the central inner tube to divide the space between the central outer tube and the central inner tube into a plurality of peripheral channels; wherein the central outer tube has a second type of through hole to connect the peripheral channel to the outside of the central outer tube; the partition ribs have at least a portion of the first type of through hole; the central channel and the peripheral channel both extend along the central axis, and the peripheral channel is formed on the opposite outer side of the central channel; the first type of through hole extends from the inner wall of the central inner tube through the partition rib to the outer wall of the central outer tube; and the two openings of a membrane bag are respectively connected to the openings of a first type of through hole and a second type of through hole at the central outer tube.

[0012] Furthermore, the permeation membrane assembly also includes: a first type of end connecting tube for connecting to the end of the central tube; the first type of end connecting tube is divided into: a first type of connector portion, configured with a single-layer tube structure; and a first type of insertion portion, configured with a double-layer tube structure, distributed along the central axis; wherein the first type of end connecting tube has a first type of drainage channel extending along the central axis from the first type of connector portion to the first type of insertion portion; one end of the first type of drainage channel at the first type of connector portion is open; the other end of the first type of drainage channel at the first type of insertion portion is closed; and the first type of insertion portion has a closed... A type of drainage channel connector closure structure; wherein, the first type of insertion part includes a first type of insertion outer tube and a first type of insertion inner tube, the first type of insertion inner tube being located inside the first type of insertion outer tube; a first type of insertion groove for inserting a central inner tube is provided between the first type of insertion outer tube and the first type of insertion inner tube; the tube wall of the first type of insertion inner tube is provided with several third type of through holes connecting the drainage channel and the first type of insertion groove; the groove opening distance of the first type of insertion groove is greater than the wall thickness at the end of the central inner tube so that when the first type of end connecting tube is inserted into the central tube, there is space for liquid to flow between the outer wall of the central inner tube and the inner wall of the first type of end connecting tube.

[0013] Furthermore, the outer wall of the first type of insert inner tube is provided with a first type of inner stop structure for stopping the end of the central inner tube.

[0014] Furthermore, the inner wall of the central inner tube is provided with a central inner stop structure for stopping the end of the first type of insert inner tube.

[0015] Furthermore, the outer wall of the first type of insert outer tube is provided with a first type of outer stop structure for stopping the end of the central outer tube.

[0016] Furthermore, the inner wall of the central outer tube is provided with a central outer stop structure for stopping the end of the first type of insert outer tube.

[0017] Furthermore, the permeation membrane assembly also includes: a second type of end connector for connecting to the end of the central tube; the second type of end connector is divided into: a second type of connector portion, configured with a single-layer tube structure; and a second type of insertion portion, configured with a double-layer tube structure, distributed along the central axis; wherein the second type of end connector has a second type of drainage channel extending along the central axis and from the second type of connector portion to the second type of insertion portion; one end of the second type of drainage channel at the second type of connector portion is open; the other end of the second type of drainage channel at the second type of insertion portion is open; wherein the second type of insertion portion includes a second type of insertion outer tube and a second type of insertion inner tube, the second type of insertion inner tube being located inside the second type of insertion outer tube; the second type of insertion portion has a second type of insertion groove for the central inner tube to be inserted into the second type of insertion outer tube and the second type of insertion inner tube.

[0018] Furthermore, the permeation membrane assembly also includes: a first type of connecting inner tube, having a first type of connecting tube hole extending along the central axis and penetrating the first type of connecting inner tube; the two ends of the first type of connecting inner tube are respectively inserted into the interiors of two different central inner tubes so that the first type of connecting tube hole connects the central channel of the two different central inner tubes.

[0019] Furthermore, the permeation membrane assembly also includes: a first type of connecting outer tube, having a first type of connecting tube hole extending along the central axis and penetrating the first type of connecting outer tube; both ends of the first type of connecting outer tube are respectively inserted into the interiors of two different central outer tubes; the corresponding two different central inner tubes are located inside the first type of connecting tube hole of the first type of connecting outer tube so that the channel formed between the outer wall of the central inner tube and the inner wall of the first type of connecting outer tube connects the peripheral channels of the corresponding two different central tubes.

[0020] Furthermore, the permeation membrane assembly also includes: a second type of connecting inner tube, having a second type of connecting tube hole extending along the central axis and open at one end and closed at the other; the second type of connecting inner tube also has a connecting flow hole penetrating its sidewall; one end of the second type of connecting inner tube has a connecting sealing structure that closes the second type of connecting tube hole; the two ends of the second type of connecting inner tube are respectively inserted into the interiors of two different central inner tubes so that while isolating the central channel of one central inner tube from the central channel of the other central inner tube, the central channel of one central inner tube is connected to the outer peripheral channel of the other central inner tube through the second type of connecting tube hole and the connecting flow hole.

[0021] Furthermore, the permeation membrane assembly also includes: a second type of connecting outer tube, having a second type of connecting tube hole extending along the central axis and penetrating the second type of connecting outer tube; both ends of the second type of connecting outer tube are respectively inserted into the interiors of two different central outer tubes; the corresponding two different central inner tubes are located inside the second type of connecting tube hole of the second type of connecting outer tube; the connecting flow hole is connected to the interlayer space between the inner wall of the second type of connecting outer tube and the outer wall of the central inner tube through the gap between the ends of the corresponding two different central inner tubes; the inner wall of the second type of connecting outer tube forms a connecting inner sealing structure at one end to isolate the connection of the peripheral channels outside the corresponding two different central inner tubes.

[0022] Furthermore, in the direction of the central axis, the connecting flow hole is set between the connecting inner sealing structure and the connecting closed structure.

[0023] Furthermore, the permeation membrane assembly also includes: a housing with an internal space; and a central tube and a membrane roll that are housed together within the housing.

[0024] Furthermore, the permeation membrane assembly also includes: end caps with support holes for supporting the central tube; the end caps are disposed at both ends of the housing in the direction of the central axis.

[0025] As a second aspect of this application, some embodiments of this application provide a pressure-assisted permeation device, including the aforementioned permeation membrane assembly.

[0026] The beneficial effects of this application are: it provides a pressure-assisted permeation device and its permeation membrane assembly that are structurally reasonable and easy to assemble and disassemble.

[0027] More specifically, some embodiments of this application may produce the following specific beneficial effects:

[0028] The use of both type I and type II end connecting pipes allows the central pipe to be easily installed into the pressure vessel of the pressure-assisted permeation device.

[0029] The use of both type I and type II end connecting pipes allows for flexible modification of the liquid extraction channel configuration at the end of the central tube.

[0030] Using a type I insert inner tube and a type I insert outer tube allows a central tube to easily form a direct connection between a central channel and a peripheral channel with another adjacent central tube.

[0031] Using a first-type insert inner tube and a first-type insert outer tube allows the central tube to easily form a cross-connection between the central tube and adjacent central tubes, creating a central channel and a peripheral channel. Attached Figure Description

[0032] The accompanying drawings, which form part of this application, are used to provide a further understanding of the application and to make other features, objects, and advantages of the application more apparent. The illustrative embodiments and descriptions of this application are used to explain the application and do not constitute an undue limitation of the application.

[0033] Furthermore, throughout the accompanying drawings, the same or similar reference numerals denote the same or similar elements. It should be understood that the drawings are schematic, and the elements are not necessarily drawn to scale.

[0034] In the attached diagram:

[0035] Figure 1 This is a three-dimensional structural diagram of a permeation membrane assembly according to an embodiment of this application during assembly;

[0036] Figure 2 yes Figure 1 A three-dimensional cross-sectional view of the central tube of the permeation membrane assembly in the illustrated embodiment;

[0037] Figure 3 yes Figure 1 A schematic cross-sectional view of the central tube and membrane bag of the permeate membrane module in the embodiment shown;

[0038] Figure 4 yes Figure 1A cross-sectional view of the first type of end connection tube of the permeation membrane assembly shown in the embodiment;

[0039] Figure 5 yes Figure 1 A cross-sectional view of the second type of end connection tube of the permeation membrane assembly shown in the embodiment;

[0040] Figure 6 yes Figure 1 A cross-sectional view of the first type of connecting inner tube of the permeation membrane assembly in the embodiment shown;

[0041] Figure 7 yes Figure 1 A cross-sectional view of the first type of connecting outer tube of the permeation membrane assembly in the embodiment shown;

[0042] Figure 8 yes Figure 1 A cross-sectional view of the second type of connecting inner tube of the permeation membrane assembly in the embodiment shown;

[0043] Figure 9 yes Figure 1 A cross-sectional view of the second type of connecting outer tube of the permeation membrane assembly in the embodiment shown;

[0044] Figure 10 This is a cross-sectional structural schematic diagram of a pressure-assisted permeation device according to an embodiment of this application;

[0045] Figure 11 yes Figure 9 Enlarged view of a portion of point A in the middle;

[0046] Figure 12 yes Figure 9 Enlarged view of a portion of point B in the middle;

[0047] Figure 13 yes Figure 9 Enlarged view of a portion of point C in the middle;

[0048] Figure 14 This is a cross-sectional structural schematic diagram of a pressure-assisted permeation device according to another embodiment of this application;

[0049] Figure 15 yes Figure 15 Enlarged view of a portion of point D;

[0050] Figure 16 This is a cross-sectional structural schematic diagram of a pressure-assisted permeation device according to another embodiment of this application.

[0051] Figure 17 yes Figure 16 A cross-sectional view of the central tube in the illustrated embodiment.

[0052] Meaning of the reference numerals in the attached figures:

[0053] 100. Installation unit;

[0054] 110. Central tube; 110a. Central axis; 110b. Annular slot; 111. Outer central tube; 112. Inner central tube; 113. Separating rib; 113a. Edge; 114. Central channel; 115. Peripheral channel; 116. Type I through hole; 117. Type II through hole; 118. Inner central stop structure; 119. Outer central stop structure;

[0055] 120. Film bag;

[0056] 130. Type I end connecting pipe; 131. Type I connector; 132. Type I insert; 132a. Connector closure structure; 132b. Type I insert outer pipe; 132c. Type I insert inner pipe; 132d. Type I insert groove; 132e. Type III through hole; 132f. Type I inner stop structure; 132g. Type I outer stop structure; 132h. Type I positioning groove; 132i. Type I positioning groove; 132j. End pipe sealing ring; 133. Type I drainage channel;

[0057] 140. Type II end connector; 141. Type II connector; 142. Type II insert; 142a. Type II insert outer tube; 142b. Type II insert inner tube; 142c. Type II insert groove; (142d, 142e) Type II positioning groove; 142f. End tube sealing ring; 143. Type II drainage channel;

[0058] 150. Type I connecting inner tube; 151. Type I connecting pipe hole; 152. Type I pipe positioning groove; 153. Pipe sealing ring;

[0059] 160. Type I connecting outer tube; 161. Type II connecting tube hole; 162. Type I tube positioning groove; 163. Tube sealing ring;

[0060] 170. Second type of connecting inner tube; 171. Third type of connecting pipe hole; 172. Connecting flow hole; 173. Connecting closed structure; (174, 183) Second type of connecting pipe positioning groove; (175, 184) Connecting pipe sealing ring;

[0061] 180. Type II connecting outer pipe; 181. Type IV connecting pipe hole; 182. Connecting inner sealing structure;

[0062] 190. Outer shell; 191. End cap;

[0063] 200. Pressure-assisted osmosis device; 210. Pressure vessel; 211. Vessel shell; 212. Vessel end cap; 213. Shell inlet pipe; 214. Shell outlet pipe; 215. End cap liquid inlet pipe; 216. End cap liquid outlet pipe;

[0064] 200′, Pressure-assisted permeation device; 210′, Pressure vessel; 211′, Vessel shell; 212′, Vessel end cap; 213′, Shell inlet pipe; 214′, Shell outlet pipe; 215′, End cap liquid inlet pipe; 216′, End cap liquid outlet pipe;

[0065] 200′′, Pressure-assisted permeation device; 210′′, Pressure vessel. Detailed Implementation

[0066] Embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings. While some embodiments of this disclosure are shown in the drawings, it should be understood that this disclosure can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this disclosure. It should be understood that the accompanying drawings and embodiments of this disclosure are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure.

[0067] It should also be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings. Unless otherwise specified, the embodiments and features described in this disclosure can be combined with each other.

[0068] It should be noted that the concepts of "first" and "second" mentioned in this disclosure are used only to distinguish different devices, modules or units, and are not used to limit the order of functions performed by these devices, modules or units or their interdependencies.

[0069] It should be noted that the terms “a,” “a plurality of,” and “several” used in this disclosure are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as “one or more.”

[0070] The names of messages or information exchanged between multiple devices in the embodiments of this disclosure are for illustrative purposes only and are not intended to limit the scope of such messages or information.

[0071] This disclosure will now be described in detail with reference to the accompanying drawings and embodiments.

[0072] Reference Figures 1 to 9 As shown, the permeation membrane assembly, as an embodiment of this application, includes: a central tube 110, a plurality of membrane rolls, a housing 190, and a plurality of end caps 191.

[0073] The central tube 110 extends along the central axis 110a and is provided with at least a central channel 114, a first type of through hole 116, a peripheral channel 115, and a second type of through hole 117. The membrane roll is composed of at least a membrane bag 120 whose interior is connected to the central channel 114 and the peripheral channel 115 respectively.

[0074] like Figures 2 to 3 As shown, specifically, the central tube 110 includes: a central outer tube 111, a central inner tube 112, and several dividing ribs 113.

[0075] Among them, the central outer tube 111 mainly constitutes the outer wall of the central tube 110 as a whole; the central inner tube 112 is located inside the central outer tube 111 and is used to form the central channel 114; the partition rib 113 is located between the central outer tube 111 and the central inner tube 112 to divide the space between the central outer tube 111 and the central inner tube 112 into several peripheral channels 115.

[0076] Specifically, the central outer tube 111 is provided with a second type of through hole 117 to connect the outer channel 115 with the outside of the central outer tube 111; the partition rib 113 is provided with at least a portion of the first type of through hole 116; the central channel 114 and the outer channel 115 both extend along the central axis 110a and the outer channel 115 is formed on the opposite side of the central channel 114; the first type of through hole 116 extends from the inner wall of the central inner tube 112 through the partition rib 113 to the outer wall of the central outer tube 111; the two openings of a membrane bag 120 are respectively connected to the openings of a first type of through hole 116 and a second type of through hole 117 at the central outer tube 111.

[0077] In actual manufacturing, a double-layered tube with partition ribs 113 can be processed first, and then holes can be drilled at the corresponding positions to form a first type of through hole 116 and a second type of through hole 117. Compared with the existing technology that uses multiple independent conduits, drills holes in each conduit, and assembles them into a whole with additional supports, the above solution is obviously easier to implement and less prone to clogging problems.

[0078] For ease of explanation, the axial, radial, and circumferential directions mentioned below are defined with reference to the central axis 110a. The cross sections mentioned below are cutting planes perpendicular to the central axis 110a, and the longitudinal sections mentioned below are cutting planes parallel to the central axis 110a (including but not limited to the cutting plane containing the central axis 110a). Unless otherwise specified, the axial, radial, and circumferential directions, as well as the cross sections and longitudinal sections, are defined using the following definitions.

[0079] like Figure 3 As shown, both the outer and inner walls of the central inner tube 112 are constructed as cylindrical surfaces, meaning that the cross-section of the central channel 114 is approximately circular.

[0080] The projections of the partition rib 113 in the cross-section extend approximately along different radial directions, such as Figure 3 As shown, the four dividing ribs 113 are distributed at equal intervals in the circumferential direction, that is, a dividing rib 113 is set at 90 degrees interval in the circumferential direction. The first type of through hole 116 in each dividing rib 113 also extends in the corresponding radial direction. The two edges 113a of the cross-section of the dividing rib are arranged in parallel and parallel to the extension direction of the first type of through hole 116 in the dividing rib 113, that is, the radial direction where the first type of through hole 116 is located.

[0081] Both the outer and inner walls of the central outer tube 111 are constructed as cylindrical surfaces, so that the cross-section of the outer channel 115 is approximately fan-shaped, consisting of two concentric circular arcs and a radial straight line connecting them (formed by the edge 113a of the partition rib). This maximizes the cross-section of the outer channel 115 to ensure smooth flow, while not encroaching on the space of the central channel 114 and the first type of through hole 116.

[0082] As a specific embodiment, the second type of through hole 117 is located in the center of the fan-shaped outer channel 115 in the circumferential direction, and the extension direction of the second type of through hole 117 also coincides with the radial direction at that location; that is, the cross-section of the outer channel 115 is mirror symmetrical with respect to the radial direction where the second type of through hole 117 is located.

[0083] By sampling the above specific scheme, the partition rib 113 can provide support with minimal material while facilitating the setting of the first type of through hole 116. The partition rib 113 configured in this way can minimize its projected area in the cross-section, thereby ensuring that the central channel 114 and the peripheral channel 115 have sufficient passage area. In particular, compared with the scheme in the prior art where independent conduits constitute the central channel 114 and the peripheral channel 115 respectively, the above scheme not only improves the convenience of manufacturing and installation, but also ensures that the channel has sufficient transport capacity.

[0084] In addition to the membrane bag 120, the membrane roll also includes a support mesh (not shown in the figure) disposed on both sides of the membrane bag 120 for support and flow guidance. Multiple sets of membrane bags 120 and the support mesh are spirally rolled and stacked on the outer periphery of the central tube 110 to form a whole. The core component of the membrane bag 120 is a semi-permeable membrane, with a separation layer on the outer side and a support layer on the inner side. Depending on the specific needs, the permeate membrane module of this application can be used as both a reverse osmosis membrane and a forward osmosis membrane. More specifically, the membrane bag 120 has two independent liquid flow channel systems inside and outside. The outer side of the membrane bag 120 is for inlet water and product water channels, and the inner side is for draw liquid inlet and outlet channels.

[0085] The specific structure and material of the membrane bag 120, as well as the roll-up method of the membrane bag 120 and the technical solution for its combination with the central tube 110, are already well known to those skilled in the art and are not improvements of this application, so they will not be elaborated here.

[0086] For example Figure 1 and Figure 2 As shown, in order to encapsulate the central tube 110 and the membrane roll as a whole, the outer shell 190 is provided with an internal space. The central tube 110 and the membrane roll are housed in the outer shell 190. The central tube 110, the membrane roll, the outer shell 190 and the end cap 191 form an integral structure. This part of the process is a technical solution well known to those skilled in the art and is not an improvement of this application, so it will not be described in detail here.

[0087] For example Figure 1 , Figure 2 , Figure 4 , Figure 5 , Figure 10 , Figure 11 , Figure 12 and Figure 16 As shown, in order to connect the end of the permeation membrane assembly of this application to the pressure vessel 210 of the pressure-assisted permeation device 200, in particular, the end of the central tube 110 is made to communicate with the inlet or outlet pipe of the extracting liquid of the pressure vessel 210.

[0088] Depending on whether the inlet or outlet pipe of the extractant is connected to the peripheral channel 115 or the central channel 114 of the central tube 110, the permeation membrane assembly of this application is also configured with two different end connection pipes. Specifically, the end connection pipes of the permeation membrane assembly of this application are divided into: a first type of end connection pipe 130 and a second type of end connection pipe 140.

[0089] Both the first type of end connecting pipe 130 and the second type of end connecting pipe 140 are used to connect to the end of the central pipe 110. They are interchangeable general-purpose components. The difference is that the first type of end connecting pipe 130 only connects the inlet or outlet pipe of the liquid to the outer channel 115 of the central pipe 110; the second type of end connecting pipe 140 only connects the inlet or outlet pipe of the liquid to the central channel 114 of the central pipe 110.

[0090] Specifically, the first type of end connecting tube 130 includes a first type of connector portion 131 and a first type of insert portion 132 distributed in the direction of the central axis 110a.

[0091] The first type of connector 131 is configured to have a single-layer tube structure; the first type of insert 132 is configured to have a double-layer tube structure; the first type of end connecting tube 130 is provided with a first type of drainage channel 133 extending along the central axis 110a and extending from the first type of connector 131 to the first type of insert 132; the first type of drainage channel 133 is open at one end of the first type of connector 131; the first type of drainage channel 133 is closed at the other end of the first type of insert 132; the first type of insert 132 is provided with a connector sealing structure 132a that closes the first type of drainage channel 133.

[0092] The first type of insertion part 132 includes a first type of insertion outer tube 132b and a first type of insertion inner tube 132c, the first type of insertion inner tube 132c being located inside the first type of insertion outer tube 132b; a first type of insertion groove 132d for inserting a central inner tube 112 is provided between the first type of insertion outer tube 132b and the first type of insertion inner tube 132c; the tube wall of the first type of insertion inner tube 132c is provided with several connecting guide channels and third type through holes 132e of the first type of insertion groove 132d; the groove opening distance of the first type of insertion groove 132d is greater than the wall thickness at the end of the central inner tube 112 so that when the first type of end connecting tube 130 is inserted into the central tube 110, there is space for liquid to flow between the outer wall of the central inner tube 112 and the inner wall of the first type of end connecting tube.

[0093] As a more specific embodiment, a plug baffle is provided on one side of the slot opening of the first type of insert inner tube 132c to form the aforementioned joint sealing structure 132a. Of course, additional sealing elements can also be used to form the aforementioned joint sealing structure 132a.

[0094] As a more specific embodiment, the third type of through hole 132e extends approximately radially.

[0095] To achieve positioning and stopping during insertion, as a preferred solution, the outer wall of the first type of insert inner tube 132c is provided with a first type of inner stop structure for stopping the end of the central inner tube 112; the inner wall of the central inner tube 112 is provided with a central inner stop structure 118 for stopping the end of the first type of insert inner tube 132c; the outer wall of the first type of insert outer tube 132b is provided with a first type of outer stop structure 132g for stopping the end of the central outer tube 111, and the first type of outer stop structure 132g can also serve as a structural reinforcement; the inner wall of the central outer tube 111 is provided with a central outer stop structure 119 for stopping the end of the first type of insert outer tube 132b. In this way, the cooperation of the corresponding stop structures allows for quick installation and accurate positioning.

[0096] As a preferred embodiment, in order to construct the inner central stop structure 118 and the outer central stop structure 119, the two ends of the central tube 110 extend outward in the axial direction beyond the partition rib 113, thereby forming annular slots 110b at both ends of the central tube 110 into which the first type of insert inner tube 132c can be inserted. That is, in the direction of extension of the central axis 110a, the length of the central tube 110 is greater than the length of the partition rib 113, and both ends of the central tube 110 extend beyond the partition rib 113 in the axial direction.

[0097] As a further preferred option, in order to ensure that there is space for liquid to flow between the outer wall of the central inner tube 112 and the inner wall of the first type of end connecting tube 130, that is, to ensure smooth flow in the peripheral channel 115, the walls of the central inner tube 112 and the central outer tube 111, which form annular slots 110b at both ends of the central tube 110, are both expanded outward (to a concentric cylindrical surface with a larger radius), that is, a stepped structure is formed on the inner walls of the central outer tube 111 and the central inner tube 112. The stepped structure of the inner walls of the central outer tube 111 and the central inner tube 112 serves as the aforementioned central outer stop structure 119 and central inner stop structure 118.

[0098] As a preferred embodiment, the distance from the stepped structure of the inner wall of the central outer tube 111 and the central inner tube 112 to their end faces is greater than or equal to half the length of the central outer tube 111 and the central inner tube 112.

[0099] Specifically, the second type of end connecting tube 140 includes a second type of connector 141 and a second type of insert 142 distributed in the direction of the central axis 110a.

[0100] The second type of connector 141 is configured to have a single-layer tube structure; the second type of insert 142 is configured to have a double-layer tube structure.

[0101] The second type of end connector 140 is provided with a second type of drainage channel 143 extending along the central axis 110a and extending from the second type of connector 141 to the second type of insert 142; the second type of drainage channel 143 is open at one end of the second type of connector 141; the second type of drainage channel 143 is open at the other end of the second type of insert 142.

[0102] The second type of insertion part 142 includes a second type of insertion outer tube 142a and a second type of insertion inner tube 142b, the second type of insertion inner tube 142b being located inside the second type of insertion outer tube 142a; the second type of insertion part 142 is provided with a second type of insertion groove 142c for inserting the central inner tube 112 in the second type of insertion outer tube 142a and the second type of insertion inner tube 142b.

[0103] Compared to the first type of end connecting pipe 130, the flow path of the second type of end connecting pipe 140 is simpler. There is no channel between the second type of drainage channel 143 and the second type of insert groove 142c. Therefore, the second type of drainage channel 143 can directly connect the inlet or outlet pipe of the liquid to the central channel 114 of the central pipe 110.

[0104] It should be noted that the wall thickness of the second type of insert outer tube 142a can be thicker to completely seal the annular groove at the end of the central tube 110 after insertion, that is, to completely seal the connection between the surrounding channel and the second type of insert groove 142c; however, this would make it impossible to manufacture it in a universal manner with the first type of end component connecting tube during processing; therefore, the same wall thickness as the first type of insert outer tube 132b of the first type of end component is still used here.

[0105] As a further preferred embodiment, to achieve a seal after insertion, corresponding end-tube sealing rings 132j ​​and 142f are fitted at corresponding positions on the first type of end-connecting tube 130 and the second type of end-connecting tube 140. More specifically, the outer walls of the first type of insert inner tube 132c and the second insert outer tube of the first type of insert part 132 are provided with two annular first type of end-tube positioning grooves 132h and 132i, and the end-tube sealing ring 132j ​​is installed and positioned by embedding into the first type of end-tube positioning groove. Similarly, the ends of the second type of insert inner tube 142b and the second insert outer tube of the second type of insert part 142 are provided with two annular second type of end-tube positioning grooves 142d and 142e, and the end-tube sealing ring 142f is installed and positioned by embedding into the second type of end-tube positioning groove. These end-tube sealing rings can effectively seal the gaps between the tube walls after insertion to achieve a sealing effect.

[0106] like Figure 1 , Figures 6 to 10 , Figure 13 , Figure 15 and Figure 16 As shown, in order to enable one central tube 110 of the permeation membrane assembly of this application to be connected and communicate with another central tube 110, thereby enabling the permeation membrane assembly to be modularly assembled, as a specific solution, the permeation membrane assembly of this application further includes: a first type of connecting inner tube 150, a first type of connecting outer tube 160, a second type of connecting inner tube 170, and a second type of connecting outer tube 180.

[0107] The first type of connecting inner tube 150 is provided with a first type of connecting tube hole 151 extending along the central axis 110a and penetrating the first type of connecting inner tube 150; the two ends of the first type of connecting inner tube 150 are respectively inserted into the interiors of two different central inner tubes 112 so that the first type of connecting tube hole 151 connects the central channel 114 of the two different central inner tubes 112.

[0108] The first type of connecting outer tube 160 is provided with a first type of connecting tube hole 151 extending along the central axis 110a and penetrating the first type of connecting outer tube 160; both ends of the first type of connecting outer tube 160 are respectively inserted into the interior of two different central outer tubes 111; the corresponding two different central inner tubes 112 are located inside the first type of connecting tube hole 151 of the first type of connecting outer tube 160 so that the channel formed between the outer wall of the central inner tube 112 and the inner wall of the first type of connecting outer tube 160 connects the peripheral channel 115 of the corresponding two different central tubes 110.

[0109] The function of the first-type connecting inner tube 150 and the first-type connecting outer tube 160 is to connect the central channels 114 and peripheral channels 115 of the two connected central tubes 110 respectively. That is, the central channels 114 of the two connected central tubes 110 are connected into one channel, and the peripheral channels 115 of the two connected central tubes 110 are connected into another channel isolated from the aforementioned channel, thereby maintaining the original flow path of the liquid in the previous central tube 110 to continue flowing to the next central tube 110. Therefore, the first-type connecting inner tube 150 and the first-type connecting outer tube 160 are used as a connection between two central tubes 110 when it is necessary to maintain the original flow path.

[0110] Similarly, the stepped structure formed on the inner wall of the end of the original central inner tube 112 and central outer tube 111 can also limit and stop the first type of connecting inner tube 150 and the first type of connecting outer tube 160, thus facilitating positioning during insertion.

[0111] As a preferred solution, in order to better achieve isolation and closure between channels, two annular first-type connecting pipe positioning grooves 152 and 162 are provided on the outer wall of the end of the first-type connecting inner pipe 150 and the first-type connecting outer pipe 160; then, corresponding connecting pipe sealing rings 153 and 163 are fitted at these locations.

[0112] The second type of connecting outer tube 180 is provided with a second type of connecting tube hole 181 extending along the central axis 110a and penetrating the second type of connecting outer tube 180; both ends of the second type of connecting outer tube 180 are respectively inserted into the interior of two different central outer tubes 111; the corresponding two different central inner tubes 112 are located inside the second type of connecting tube hole 181 of the second type of connecting outer tube 180; the connecting flow hole 172 is connected to the interlayer space between the inner wall of the second type of connecting outer tube 180 and the outer wall of the central inner tube 112 through the gap between the ends of the two corresponding different central inner tubes 112; the inner wall of the second type of connecting outer tube 180 forms a connecting inner sealing structure 182 at one end to isolate the connection of the outer peripheral channel 115 outside the two corresponding different central inner tubes 112.

[0113] The function of the second type of connecting inner tube 170 and the second type of connecting outer tube 180 is to form a cross-connection between the central channel 114 and the peripheral channel 115 of the two central tubes 110 they connect. That is, the central channel 114 in the previous central tube 110 is connected to the peripheral channel 115 of the next central tube 110, while isolating the central channel 114 of the previous central tube 110 from the central channel 114 of the next central tube 110. In this way, the liquid flow in the central channel 114 of the previous central tube 110 can only flow through the membrane bag 120.

[0114] Similarly, the stepped structure formed on the inner wall of the end of the original central inner tube 112 and central outer tube 111 can also limit and stop the second type of connecting inner tube 170 and the second type of connecting outer tube 180, thus facilitating positioning during insertion.

[0115] As a preferred solution, in order to better achieve isolation and closure between channels, two annular second-type connecting pipe positioning grooves 174 and 183 are provided on the outer wall of the end of the second-type connecting inner pipe 170 and the second-type connecting outer pipe 180; then, corresponding connecting pipe sealing rings 175 and 184 are fitted at these locations.

[0116] The above description of the permeation membrane assembly of this application is illustrated in conjunction with the accompanying drawings. The outer shell 190, the two end caps 191, the central tube 110, and the membrane roll can constitute an installation unit 100. When constructing a pressure-assisted permeation device 200, the installation unit 100 can be assembled as needed. Then, the central tubes 110 of different units can be connected by selectively connecting the installation units 100 through a first type of connecting inner tube 150, a first type of connecting outer tube 160, a second type of connecting inner tube 170, and a second type of connecting outer tube 180.

[0117] Of course, in order to accommodate the number of installation units 100, it is also necessary to select suitable pressure vessels, first type end connection pipes 130 and second type end connection pipes 140, etc.

[0118] As a preferred embodiment, in order to achieve a seal between the end cap 191 and the outer tube and the inner wall of the pressure vessel 210 in the pressure-assisted permeation device 200, an embedding groove is provided circumferentially on the outer wall of the end cap 191, and an outer edge sealing ring is provided in the embedding groove; as a further embodiment, an outer edge sealing ring can be provided on one of the end caps 191 in an installation unit 100.

[0119] Reference Figures 11 to 14 The pressure-assisted permeation device 200 shown includes a pressure vessel 210 and two sets of mounting units 100 disposed therein.

[0120] Specifically, the pressure vessel 210 includes a vessel shell 211 and two vessel end caps 212. The vessel shell 211 is constructed to be generally tubular; the two vessel end caps 212 are disposed at both ends of the vessel shell 211.

[0121] The container shell 211 is provided with a shell inlet pipe 213 and a shell outlet pipe 214, which are used to connect raw water and output concentrated water, respectively.

[0122] The container end cap 212 is provided with an end cap inlet pipe 215 and an end cap outlet pipe 216, which can be used to connect concentrated extractant and output dilute extractant, respectively.

[0123] The flow direction and specific principles of raw water, concentrated water, concentrated extract, and dilute extract are well known to those skilled in the art and will not be elaborated here.

[0124] like Figures 11 to 14 As shown, the end cap inlet pipe 215 is connected to the first group of central pipes 110 via a first type of end connecting pipe 130, so that the concentrated extractable liquid introduced by the end cap inlet pipe 215 enters the peripheral channel 115 of the first group of central pipes 110; then, the first group of central pipes 110 is connected to the second group of central pipes 110 via a first type of connecting inner pipe 150 and a second type of connecting inner pipe 170, so that the concentrated extractable liquid continues to flow in the peripheral channel 115 of the second group of central pipes 110 along the original path. The second group of central pipes 110 is connected to the end cap outlet pipe 216 via a second type of end connecting pipe 140, so that the peripheral channel 115 of the second group of central pipes 110 is not connected to the end cap outlet pipe 216, but the central channel 114 of the second group of central pipes 110 is connected to the end cap outlet pipe 216; at this time, the liquid flow in the central channel 114 of the first and second group of central pipes 110 both flows in through the membrane bag 120 from the peripheral channel 115.

[0125] Example 2

[0126] like Figures 14 to 15 The pressure-assisted permeation apparatus 200' shown includes a pressure vessel 210' and three sets of mounting units 100 disposed therein. The pressure vessel 210' can be... Figure 11 The difference in the structure of the embodiment shown is that the positions of the end cap liquid inlet pipe 215′ and the end cap liquid outlet pipe 216′ are reversed. That is, the side closer to the housing water inlet pipe 213′ is the end cap liquid inlet pipe 215′ for receiving the absorbent liquid, and the side closer to the housing water outlet pipe 214′ is the end cap liquid outlet pipe 216′ for outputting the dilute absorbent liquid.

[0127] The side where the absorbent enters is designated as the first set of installation units 100, such as... Figure 15It can be seen that the central pipe 110 of the first group is connected to the shell inlet pipe 213′ by the second type of end connecting pipe 140, so that the shell inlet pipe 213′ is connected to the central channel 114 of the central pipe 110 of the first group; the central pipe 110 of the second group is connected to the central pipe 110 of the third group through the second type of connecting inner pipe 170 and the second type of connecting outer pipe 180, that is, the outer channel 115 of the central pipe 110 of the first group is connected to the central channel 114 of the central pipe 110 of the second group, while isolating the connection between the outer channel 115 of the first group and the outer channel 115 of the second group; the central pipe 110 of the second group is connected to the central pipe 110 of the third group through the second type of connecting inner pipe 170 and the second type of connecting outer pipe 180, that is, the central channel 114 of the central pipe 110 of the second group is connected to the central channel 114 of the third group, and the outer channel 115 of the central pipe 110 of the second group is connected to the outer channel 115 of the third group. The third group of central tubes 110 and the end cap outlet tube 216′ are connected by the first type of end connecting tube 130, that is, the peripheral channel 115 of the third group of central tubes 110 is connected to the end cap outlet tube 216′.

[0128] This design better meets the needs of the design and operation.

[0129] Reference Figures 16 to 17 The pressure-assisted permeation device 200′′ shown has a pressure vessel 210′′ and Figure 15 Similar to the embodiment shown, the side near the housing inlet pipe 213 is the end cap liquid inlet pipe 215 for receiving the extractant, and the side near the housing outlet pipe 214 is the end cap liquid outlet pipe 216 for outputting the dilute extractant. The difference of this pressure-assisted osmosis device 200′′ is that the first type of through hole 116 and the second type of through hole 117 of its central pipe 110 are both partially arranged in the axial direction and do not overlap. That is, the first type of through hole 116 is only arranged in a section in the direction of the central axis 110a, which is defined as the first region, and the second type of through hole 117 is arranged in another section in the direction of the central axis 110a, which is defined as the second region. The first region and the second region do not overlap in the direction of the central axis 110a.

[0130] And, as Figure 17 As shown, an adhesive strip is provided at the membrane bag 120 connected to a central tube 110 to divide the membrane bag 120 into two parts. The adhesive strip does not extend to the end of the membrane bag 120. The membrane bag 120 can form a "U"-shaped flow path on both sides of the adhesive strip. The adhesive strip is provided between the first and second regions in the direction of the central axis 110a. In this way, the absorbent flowing from the central channel 114 of the central tube 110 through the first type of through hole 116 into the membrane bag 120 bypasses the part glued by the adhesive strip in the membrane bag 120 and enters the peripheral channel 115 of the central tube 110 through the second type of through hole 117.

[0131] A second type of connecting inner tube 170 and a second type of connecting outer tube 180 are used to connect the outer channel 115 of the first group of central tubes 110 to the central channel 114 of the second group of central tubes 110. The second group of central tubes 110 is connected to the end cap liquid outlet pipe through a first type of end connecting tube 130, and the outer channel 115 of the second group of central tubes 110 is connected to the end cap liquid outlet pipe.

[0132] This design is closer to the traditional forward osmosis operation mode, but the design of the central tube 110 is more reasonable, and it can also realize the concentration and flow distribution scheme of the draw solution in related technology 2.

[0133] As can be seen from the above introduction, this application addresses the problem that related technologies cannot provide an effective solution for the distribution of draw solution concentration and flow rate. The above solution provides a superior solution. The solution of this application, through flexible combination, makes the distribution of draw solution (including flow rate and concentration) easier to control and adjust. At the same time, the above solution can be directly matched and connected with conventional reverse osmosis membrane housings (i.e., the pressure vessels mentioned above) used as standard products, which is easy to put into practical application and facilitates the transformation of existing equipment.

[0134] The above description is merely a selection of preferred embodiments of this disclosure and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in the embodiments of this disclosure is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described inventive concept. For example, technical solutions formed by substituting the above-described features with (but not limited to) technical features with similar functions disclosed in the embodiments of this disclosure.

Claims

1. A permeable membrane assembly, comprising: a center tube extending along a center axis and provided with at least a center passage, a first type of through hole, a peripheral passage, and a second type of through hole; a plurality of membrane rolls each consisting of at least a membrane bag in communication with the center passage and the peripheral passage respectively; and characterized in that: the center tube comprises: a center outer tube serving as an outer wall of the center tube as a whole; a center inner tube arranged inside the center outer tube and serving as the center passage; a plurality of partitioning ribs arranged between the center outer tube and the center inner tube to divide the space between the center outer tube and the center inner tube into a plurality of peripheral passages; the center outer tube is provided with the second type of through hole to communicate the peripheral passage with the outside of the center outer tube; the partitioning ribs are provided with at least a part of the first type of through hole; the center passage and the peripheral passage both extend along the center axis and the peripheral passage is formed on the opposite outer side of the center passage; the first type of through hole extends from the inner wall of the center inner tube to the outer wall of the center outer tube through the partitioning ribs; two bag openings of one of the membrane bags are respectively connected to one of the first type of through hole and one of the second type of through hole at the opening of the center outer tube. 2.The permeable membrane assembly according to claim 1, further comprising: a first type of end connecting tube connected to the end of the center tube; and the first type of end connecting tube is divided into: a first type of joint part configured as a single-layer tube structure; a first type of plug-in part configured as a double-layer tube structure; the first type of end connecting tube is provided with a first type of flow channel extending along the center axis and extending from the first type of joint part to the first type of plug-in part; one end of the first type of flow channel is open; the other end of the first type of flow channel is closed; the first type of plug-in part is provided with a joint closing structure closing the first type of flow channel; the first type of plug-in part comprises a first type of plug-in outer tube and a first type of plug-in inner tube, the first type of plug-in inner tube is inside the first type of plug-in outer tube; a first type of plug-in slot is arranged between the first type of plug-in outer tube and the first type of plug-in inner tube for inserting the center inner tube; the tube wall of the first type of plug-in inner tube is provided with a plurality of communication flow channels and the third type of through hole of the first type of plug-in slot; the slot opening distance of the first type of plug-in slot is greater than the wall thickness at the end of the center inner tube so that there is a space for liquid flow between the outer wall of the center inner tube and the inner wall of the first type of end connecting tube when the first type of end connecting tube is plugged into the center tube. 3.The permeable membrane assembly according to claim 2, wherein: the outer wall of the first type of plug-in inner tube is provided with a first type of inner stop structure for stopping the end of the center inner tube. 4.The permeable membrane assembly according to claim 3, wherein: ​ A center inner stop structure is arranged on the inner wall of the center inner tube for stopping the end of the first type of inserted inner tube.

5. The permeable membrane assembly of claim 2, wherein: A first type of outer stop structure is arranged on the outer wall of the first type of inserted outer tube for stopping the end of the center outer tube.

6. The permeable membrane assembly of claim 5, wherein: A center outer stop structure is arranged on the inner wall of the center outer tube for stopping the end of the first type of inserted outer tube.

7. The permeable membrane assembly of claim 1, wherein: The permeable membrane assembly further comprises: A second type of end connecting tube for connecting to the end of the center tube; The second type of end connecting tube is divided into: A second type of joint part configured to have a single-layer tube structure; A second type of inserted part configured to have a double-layer tube structure; The second type of end connecting tube is provided with a second type of flow channel extending along the center axis and extending from the second type of joint part to the second type of inserted part; one end of the second type of flow channel is open; the other end of the second type of flow channel is open; The second type of inserted part comprises a second type of inserted outer tube and a second type of inserted inner tube, the second type of inserted inner tube is located inside the second type of inserted outer tube; the second type of inserted part is provided with a second type of inserted slot for inserting the center inner tube at the second type of inserted outer tube and the second type of inserted inner tube.

8. The permeable membrane assembly of claim 1, wherein: The permeable membrane assembly further comprises: A first type of adapter inner tube provided with a first type of adapter tube hole extending along the center axis and penetrating through the first type of adapter inner tube; The two ends of the first type of adapter inner tube are respectively inserted into the interiors of two different center inner tubes to make the first type of adapter tube hole communicate with the center channels of the two different center inner tubes.

9. The permeable membrane assembly of claim 8, wherein: The permeable membrane assembly further comprises: A first type of adapter outer tube provided with a first type of adapter tube hole extending along the center axis and penetrating through the first type of adapter outer tube; The two ends of the first type of adapter outer tube are respectively inserted into the interiors of two different center outer tubes; the corresponding two different center inner tubes are located inside the first type of adapter tube hole of the first type of adapter outer tube to make the channels between the outer walls of the center inner tubes and the inner walls of the first type of adapter outer tube communicate with the peripheral channels of the corresponding two different center tubes.

10. The permeable membrane assembly of claim 1, wherein: The permeable membrane assembly further comprises: A second type of adapter inner tube provided with a second type of adapter tube hole extending along the center axis and open at one end and closed at the other end; The second type of adapter inner tube is further provided with an adapter flow-through hole penetrating through the side wall thereof; one end of the second type of adapter inner tube is provided with an adapter closing structure closing the adapter tube hole of the second type of adapter inner tube; two ends of the second type of adapter inner tube are respectively inserted into the interiors of two different center inner tubes so as to make the center passage of one center inner tube communicate with the peripheral passage outside the other center inner tube via the second type of adapter tube hole and the adapter flow-through hole while cutting off the communication between the center passage of one center inner tube and the center passage of the other center inner tube.

11. The osmotic membrane module according to claim 10, wherein: The osmotic membrane module further comprises: a second type of adapter outer tube provided with a second type of adapter tube hole extending along the center axis and penetrating through the second type of adapter outer tube; two ends of the second type of adapter outer tube are respectively inserted into the interiors of two different center outer tubes; the corresponding two different center inner tubes are located inside the second type of adapter tube hole of the second type of adapter outer tube; the adapter flow-through hole communicates to the interlayer space between the inner wall of the second type of adapter outer tube and the outer wall of the center inner tube through the gap between the end portions of the corresponding two different center inner tubes; the inner wall of the second type of adapter outer tube forms an adapter inner sealing structure at one end portion so as to cut off the communication of the peripheral passages outside the corresponding two different center inner tubes.

12. The osmotic membrane module according to claim 11, wherein: In the direction of the center axis, the adapter flow-through hole is arranged between the adapter inner sealing structure and the adapter closing structure.

13. The osmotic membrane module according to claim 1, wherein: The osmotic membrane module further comprises: a housing provided with a housing inner space; the center tube and the membrane roll are integrally accommodated in the housing.

14. The osmotic membrane module according to claim 13, wherein: The osmotic membrane module further comprises: an end cap provided with a supporting hole for supporting the center tube; the end cap is arranged at two ends of the housing in the direction of the center axis.

15. A pressure-assisted osmosis device, wherein: The pressure-assisted osmosis device comprises the osmotic membrane module according to any one of claims 1 to 14.

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