Membrane element and filter element

Abstract

The utility model discloses a membrane element and a filter element, and relates to the technical field of water treatment.The membrane element comprises a water collecting pipe, a water outlet pipe, a water inlet pipe, a water outlet pipe and a water outlet pipe, the first membrane unit and the second membrane unit are rolled on the water collecting pipe and are stacked in an unfolded state of the membrane element; a pure water outlet of the first membrane unit is communicated with a raw water inlet of the second membrane unit, and the pure water outlet of the first membrane unit and the raw water inlet of the second membrane unit are positioned on the same side edge along the axial extension direction of the water collecting pipe when the first membrane unit and the second membrane unit are in an unfolded state; the pure water outlet of the first membrane unit is not communicated with the through hole of the water collecting pipe. According to the membrane element, pure water generated by filtration of the first membrane unit can be introduced into the raw water inlet of the second membrane unit for secondary filtration and purification, so that the desalination rate is increased or the membrane element adapts to raw water in a high-hardness region, and the TDS value of pure water effluent of the membrane element is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of water treatment, in particular to a membrane element and a filter core. BACKGROUND

[0002] The water quality of tap water varies greatly across the country, especially in high-hardness areas. The TDS value of the water outlet of ordinary water purifiers is still high, which affects the taste of the water outlet and leads to poor customer experience. The existing technology generally uses two membrane elements in series to further reduce the TDS value of the water outlet. However, the technical solution of using double membranes in series has a high cost and results in a large volume of the water purifier. Content of the utility model

[0003] In order to overcome the above-mentioned defects of the prior art, the technical problem to be solved by the embodiments of the present application is to provide a membrane element and a filter core, which can further reduce the TDS value of the water outlet of the water purifier without changing the volume of the water purifier and the cost of the membrane element.

[0004] The specific technical scheme of the embodiments of the present application is:

[0005] A membrane element, characterized in that it comprises:

[0006] A water collecting pipe, a through hole is formed in the pipe wall of the water collecting pipe, and the water collecting pipe collects pure water inside the water collecting pipe through the through hole;

[0007] A first membrane unit and a second membrane unit are coiled on the water collecting pipe, and the first membrane unit and the second membrane unit are stacked in the unfolded state of the membrane element;

[0008] The pure water outlet of the first membrane unit is in communication with the raw water inlet of the second membrane unit, and the pure water outlet of the first membrane unit and the raw water inlet of the second membrane unit are located on the same side along the axial extension direction of the water collecting pipe when the first membrane unit and the second membrane unit are in the unfolded state;

[0009] The pure water outlet of the first membrane unit is not in communication with the through hole of the water collecting pipe, and the pure water outlet of the second membrane unit is in communication with the through hole of the water collecting pipe.

[0010] Preferably, the membrane element has a first side connected with the water collecting pipe and a second side opposite to the first side in the unfolded state, and the membrane element also has a third side and a fourth side opposite to each other in the unfolded state, the third side and the fourth side are connected with the first side and the second side respectively, and the pure water outlet of the first membrane unit and the raw water inlet of the second membrane unit are located close to the third side of the first side when unfolded.

[0011] Preferably, the raw water inlet of the first membrane unit is located at the fourth side of the first membrane unit near the first side, the waste water outlet of the first membrane unit is located at the third side of the first membrane unit near the second side, and the waste water outlet of the second membrane unit is located at the fourth side of the second membrane unit near the second side.

[0012] Preferably, the fourth side of the raw water flow path side of the first membrane unit is sealed except for the raw water inlet of the first membrane unit, the third side of the raw water flow path side of the first membrane unit is sealed except for the waste water outlet of the first membrane unit, and the first side and the second side of the raw water flow path side of the first membrane unit are sealed.

[0013] The fourth side of the raw water flow path side of the second membrane unit is sealed except for the waste water outlet of the second membrane unit, the third side of the raw water flow path side of the second membrane unit is sealed except for the raw water inlet of the second membrane unit, and the first side and the second side of the raw water flow path side of the second membrane unit are sealed.

[0014] Preferably, the fourth side of the pure water flow path side of the first membrane unit is sealed, the third side of the pure water flow path side of the first membrane unit is sealed except for the pure water outlet of the first membrane unit, and the first side and the second side of the pure water flow path side of the first membrane unit are sealed.

[0015] The fourth side of the pure water flow path side of the second membrane unit is sealed, the third side of the pure water flow path side of the second membrane unit is sealed, and the second side of the pure water flow path side of the second membrane unit is sealed.

[0016] Preferably, in the rolled state of the membrane element, the waste water outlet of the first membrane unit, the pure water outlet of the first membrane unit, and the raw water inlet of the second membrane unit are located at one end of the membrane element, and the raw water inlet of the first membrane unit and the waste water outlet of the second membrane unit are located at the other end of the membrane element.

[0017] Preferably, the membrane element further comprises a first end cover and a second end cover arranged at both ends of the water collecting pipe, and a waterproof tape arranged on the outer circumferential surface of the membrane element.

[0018] In the rolled state of the membrane element, the fourth side of the raw water flow path side of the first membrane unit except for the part of the raw water inlet of the first membrane unit and the fourth side of the raw water flow path side of the second membrane unit except for the part of the waste water outlet of the second membrane unit are sealed by gluing between the first end cover and the end of the membrane element.

[0019] In the state that the membrane element is in the rolled state, the third side edge of the first membrane unit on the raw water flow channel side, except for the part of the waste water outlet of the first membrane unit and the third side edge of the second membrane unit on the raw water flow channel side, except for the part of the raw water inlet of the second membrane unit, is sealed by gluing between the second end cover and the end of the membrane element;

[0020] In the state that the membrane element is in the rolled state, the second side edge of the first membrane unit on the raw water flow channel side and the second side edge of the second membrane unit on the raw water flow channel side are sealed by wrapping the outer circumferential surface of the membrane element with a water-proof adhesive tape;

[0021] In the state that the membrane element is in the rolled state, the third side edge of the first membrane unit on the raw water flow channel side, except for the part of the waste water outlet of the first membrane unit and the third side edge of the second membrane unit on the raw water flow channel side, except for the part of the raw water inlet of the second membrane unit, is sealed by gluing between the second end cover and the end of the membrane element;

[0022] In the state that the membrane element is in the rolled state, the third side edge of the first membrane unit on the raw water flow channel side, except for the part of the waste water outlet of the first membrane unit and the third side edge of the second membrane unit on the raw water flow channel side, except for the part of the raw water inlet of the second membrane unit, is sealed by gluing between the second end cover and the end of the membrane element;

[0023] Preferably, the second end cover comprises a sleeve part for sleeving the end of the membrane element and a body at one end of the sleeve part, and a recess is formed in the central region of the second end cover body by extending downward at least partially;

[0024] The inner surface of the second end cover body is provided with a first rib and a second rib, and the first rib, the second rib and at least part of the sleeve part cooperatively divide the inner surface of the second end cover body into three regions, the first rib and at least part of the sleeve part form a first region, at least part of the second rib surrounds the edge of at least part of the recess to form a second region, and the remaining region of the inner surface of the second end cover body, except for the first region and the second region, forms a third region, the first region and the second region are non-gluing regions, and the third region is a gluing region.

[0025] Preferably, in the state that the membrane element is in the rolled state, the third region corresponds to the third side edge of the first membrane unit on the raw water flow channel side, except for the part of the waste water outlet of the first membrane unit and the third side edge of the second membrane unit on the raw water flow channel side, except for the part of the raw water inlet of the second membrane unit, and the third region is glued with the end of the membrane element corresponding to the third region to seal the third side edge of the first membrane unit on the raw water flow channel side, except for the part of the waste water outlet of the first membrane unit and the third side edge of the second membrane unit on the raw water flow channel side, except for the part of the raw water inlet of the second membrane unit;

[0026] In the rolled state of the membrane element, the first region corresponds to the wastewater outlet of the first membrane unit, and no glue is applied between the first region and the membrane unit end corresponding to the first region to form a first channel, which communicates with the wastewater outlet of the first membrane unit;

[0027] In the rolled state of the membrane element, the second region corresponds to the raw water inlet of the second membrane unit and the pure water outlet of the first membrane unit, and no glue is applied between the second region and the membrane unit end corresponding to the second region to form a second channel, which communicates with the raw water inlet of the second membrane unit and the pure water outlet of the first membrane unit, and the pure water flowing out of the pure water outlet of the first membrane unit flows into the raw water inlet of the second membrane unit through the second channel.

[0028] Preferably, the first end cover comprises a sleeve portion for sleeving the end of the membrane element and a body located at one end of the sleeve portion, and a central region of the first end cover body extends upward at least partially to form a first annular flange and a second annular flange sleeved outside the first annular flange;

[0029] The inner surface of the first end cover body is convexly provided with a third rib and a fourth rib, which cooperate to separate the inner surface of the first end cover body into three regions, the third rib surrounds to form a fourth region, at least part of the fourth rib surrounds the edge of at least part of the first annular flange to form a fifth region, and the remaining region of the inner surface of the body except the fourth region and the fifth region forms a sixth region, the fourth region and the fifth region are no-glue regions, and the sixth region is a glue region.

[0030] Preferably, in the rolled state of the membrane element, the sixth region corresponds to the fourth side of the raw water flow channel of the first membrane unit except the raw water inlet of the first membrane unit and the fourth side of the raw water flow channel of the second membrane unit except the wastewater outlet of the second membrane unit, and glue is applied between the sixth region and the membrane unit end corresponding to the sixth region to seal the fourth side of the raw water flow channel of the first membrane unit except the raw water inlet of the first membrane unit and the fourth side of the raw water flow channel of the second membrane unit except the wastewater outlet of the second membrane unit;

[0031] In the rolled state of the membrane element, the fourth region corresponds to the wastewater outlet of the second membrane unit, and no glue is applied between the fourth region and the membrane unit end corresponding to the fourth region to form a third channel, which communicates with the wastewater outlet of the second membrane unit;

[0032] The fifth region corresponds to the raw water inlet of the first membrane unit when the membrane element is in a rolled state, and no glue is applied between the fifth region and the membrane unit end corresponding to the fifth region to form a fourth channel that communicates with the raw water inlet of the first membrane unit.

[0033] Preferably, a through hole is formed in the inner surface of the fourth region, and the third channel communicates with the waste water outlet of the second membrane unit through the through hole.

[0034] Preferably, the water collecting pipe penetrates through the first annular flange, and a pure water flow channel is formed in the water collecting pipe, an outer side wall of the water collecting pipe and an inner side wall of the first annular flange form a raw water flow channel, and the annular channel forms a first waste water flow channel, the raw water flow channel communicates with the raw water inlet of the first membrane unit, and the first waste water flow channel communicates with the waste water outlet of the second membrane unit.

[0035] The application further discloses a filter core, which comprises the membrane element and a shell.

[0036] Preferably, the shell comprises a bottle body and a cover body, the cover body covers the top of the bottle body, and the cover body is provided with the pure water outlet, the first waste water outlet, the second waste water outlet and the raw water inlet.

[0037] The technical scheme of the application has the following remarkable beneficial effects:

[0038] The membrane element in the embodiment of the application realizes secondary filtration and purification by introducing the pure water generated by the first membrane unit into the raw water inlet of the second membrane unit, forms an internal series flow channel of the membrane element, realizes secondary treatment, improves the desalination rate or adapts to raw water in high-hardness areas, thereby reducing the TDS value of the pure water outlet of the membrane element and reducing the external pipeline connection requirement. BRIEF DESCRIPTION OF DRAWINGS

[0039] The drawings described herein are for purposes of illustration only and are not intended to limit the scope of the present disclosure in any way. Additionally, the shapes and proportions of the various components depicted in the drawings are not intended to be specific, but rather are provided as illustrative examples only. Those skilled in the art will recognize that various alternative shapes and proportions of the components depicted in the drawings could be used to implement the present application without departing from the scope of the present application.

[0040] Figure 1 A schematic view of one end portion of the membrane element in the rolled state according to an embodiment of the present application.

[0041] Figure 2 A schematic view of the other end portion of the membrane element in the rolled state according to an embodiment of the present application.

[0042] Figure 3 A schematic view of the other end portion of the membrane element in the rolled state according to an embodiment of the present application.

[0043] Figure 4 A schematic view of the other end portion of the membrane element in the rolled state according to an embodiment of the present application.

[0044] Figure 5 A schematic view of the other end portion of the membrane element in the rolled state according to an embodiment of the present application. Figure 4 A schematic view of the other end portion of the membrane element in the rolled state according to an embodiment of the present application.

[0045] Figure 6 A schematic view of the other end portion of the membrane element in the rolled state according to an embodiment of the present application.

[0046] Figure 7 A schematic view of the other end portion of the membrane element in the rolled state according to an embodiment of the present application. Figure 6 A schematic view of the other end portion of the membrane element in the rolled state according to an embodiment of the present application.

[0047] Figure 8 A schematic view of the other end portion of the membrane element in the rolled state according to an embodiment of the present application.

[0048] Figure 9 A schematic view of the other end portion of the membrane element in the rolled state according to an embodiment of the present application. Figure 8 A schematic view of the other end portion of the membrane element in the rolled state according to an embodiment of the present application.

[0049] Figure 10 A schematic view of the other end portion of the membrane element in the rolled state according to an embodiment of the present application. Figure 8 A schematic view of the other end portion of the membrane element in the rolled state according to an embodiment of the present application.

[0050] Figure 11 A schematic view of the other end portion of the membrane element in the rolled state according to an embodiment of the present application.

[0051] Figure 12 A schematic view of the other end portion of the membrane element in the rolled state according to an embodiment of the present application.

[0052] Figure 13A structure diagram of a membrane element in the embodiment of the present application.

[0053] Figure 14 A structure diagram of a membrane element in the embodiment of the present application. Figure 13 A sectional view of the membrane element.

[0054] Figure 15 A structure diagram of a laminated structure of another membrane element in the embodiment of the present application in an unfolded state.

[0055] Figure 16 A structure diagram of a membrane element in the embodiment of the present application. Figure 15 A front view of one end portion of the raw water flow passage side of the membrane element in an unfolded state.

[0056] Figure 17 A front view of the other end portion of the raw water flow passage side of the membrane element in an unfolded state. Figure 15

[0057] A front view of one end portion of the pure water flow passage side of the membrane element in an unfolded state. Figure 18 Figure 15 A front view of the other end portion of the pure water flow passage side of the membrane element in an unfolded state.

[0058] Figure 19 Figure 15 A principle diagram of the other end portion of the pure water flow passage side of the first membrane unit and the raw water flow passage side of the second membrane unit in an unfolded state.

[0059] Figure 20 A principle diagram of the other end portion of the pure water flow passage side of the first membrane unit and the raw water flow passage side of the second membrane unit in an unfolded state. Figure 15

[0060] A structure diagram of a filter cartridge in the embodiment of the present application. Figure 21 Reference signs of the above drawings:

[0061]

[0062] ​​​1, header pipe; 111, through hole; 2, first membrane unit; 21, raw water flow passage side of the first membrane unit; 22, pure water flow passage side of the first membrane unit; 23, raw water inlet of the first membrane unit in an unfolded state; 24, waste water outlet of the first membrane unit in an unfolded state; 25, pure water outlet of the first membrane unit in an unfolded state; 26, first side edge of the first membrane unit; 27, second side edge of the first membrane unit; 28, fourth side edge of the first membrane unit; 29, third side edge of the first membrane unit; 3, second membrane unit; 31, raw water flow passage side of the second membrane unit; 32, pure water flow passage side of the second membrane unit; 33, raw water inlet of the second membrane unit in an unfolded state; 34, waste water outlet of the second membrane unit in an unfolded state; 35, first side edge of the second membrane unit; 36, second side edge of the second membrane unit; 37, fourth side edge of the second membrane unit; 38, third side edge of the second membrane unit; 4, second end cover; 41, sleeve portion of the second end cover; 42, body of the second end cover; 43, groove; 44, first rib; 45, second rib; 46, first area; 47, second area; 48, third area; 5, first end cover; 51, sleeve portion of the first end cover; 52, body of the first end cover; 53, third rib; 54, fourth rib; 55, fourth area; 551, through hole; 56, fifth area; 57, sixth area; 6, second annular flange; 7, first annular flange; 8, channel; 9, waste water outlet of the first membrane unit in a wound state; 10, pure water outlet of the first membrane unit in a wound state; 11, raw water inlet of the second membrane unit in a wound state; 12, raw water inlet of the first membrane unit in a wound state; 13, waste water outlet of the second membrane unit in a wound state; 14, bottle body; 15, second waste water flow passage; 16, cover body; 161, second waste water outlet; 162, pure water outlet; 163, raw water inlet; 164, first waste water outlet; 17, first waste water flow passage; 18, pure water flow passage; 19, raw water flow passage. DETAILED DESCRIPTION

[0063] The details of the application described herein can be understood by consideration of the accompanying drawings and the following description. Such description, however, is for purposes of illustration only and should not be construed as limiting the application in any way. Given the teachings of the present application and the associated drawings, those skilled in the art will appreciate that modifications can be made to the application as described while still attaining the desired intended advantage of the application. Accordingly, the technical solutions in the present application are not limited to any specific described embodiments, but include any alternatives, modifications, equivalents, and / or improvements thereto within the spirit and scope of the present application.

[0064] In order to further reduce the TDS value of the water outlet of the membrane element, the embodiment of the present application discloses a membrane element, which comprises a first membrane unit 2 and a second membrane unit 3, the pure water outlet 25 of the first membrane unit in the unfolded state and the raw water inlet 33 of the second membrane unit in the unfolded state are communicated, the pure water flowing out of the pure water outlet 25 of the first membrane unit in the unfolded state is introduced into the raw water inlet 33 of the second membrane unit in the unfolded state through the membrane surface in series, and the pure water flowing out of the pure water outlet 25 of the first membrane unit in the unfolded state is further filtered and purified by the second membrane unit 3, so that the water outlet with a lower TDS value is obtained. The pure water outlet 25 of the first membrane unit in the unfolded state is not communicated with the water collecting pipe 1, and the pure water outlet of the second membrane unit 3 is communicated with the water collecting pipe 1, so that the pure water with a lower TDS value flowing out of the pure water outlet of the second membrane unit is collected through the water collecting pipe 1, thereby supplying pure water to the outside. Since the pure water outlet 25 of the first membrane unit in the unfolded state and the raw water inlet 33 of the second membrane unit in the unfolded state are located on the same side along the axial extension direction of the water collecting pipe 1 in the embodiment of the present application, it is beneficial for processing, manufacturing, assembly, and the volume of the membrane element adopting the structure can also be smaller. In addition, the first membrane unit 2 and the second membrane unit 3 in the embodiment of the present application are co-wound on a water collecting pipe 1, thereby making the volume of the membrane element be in a smaller range. Moreover, the first membrane unit 2 and the second membrane unit 3 in the embodiment of the present application can be co-wound on the water collecting pipe 1 at one time, which makes the preparation method of the membrane element easier and the processing procedure less.

[0065] When the membrane element is in the unfolded state, the first membrane unit 2 and the second membrane unit 3 are arranged in layers. The number of the first membrane unit 2 can be one page or multiple pages, and similarly, the number of the second membrane unit 3 can be one page or multiple pages. We take an example that the number of the first membrane unit 2 and the second membrane unit 3 is one page, and refer to Figure 4 As shown in the figure, the number of the first membrane unit 2 and the second membrane unit 3 is one page, and the front surfaces of the adjacent first membrane unit 2 and the second membrane unit 3 form a raw water flow channel, and the back surfaces of the first membrane unit 2 and the second membrane unit 3 form a pure water flow channel. Since the pure water outlet 25 of the first membrane unit in the unfolded state is not communicated with the water collecting pipe 1, and the pure water outlet of the second membrane unit in the unfolded state is communicated with the water collecting pipe 1, only the pure water generated by the second membrane unit 3 flows to the water collecting pipe 1, and the water collecting pipe 1 collects the pure water inside the water collecting pipe 1 through the through hole 111. The raw water flow channel of the first membrane unit 2 and the raw water flow channel of the second membrane unit 3 both flow in the direction away from the water collecting pipe 1. Refer to Figure 5As shown, the back side (pure water side) of the first membrane unit 2 is formed between the MN section and the ON section of the membrane page, the back side (pure water side) of the second membrane unit 3 is formed between the OQ section and the PQ section of the membrane page, the front side (raw water side) of the first membrane unit 2 and the front side (raw water side) of the second membrane unit 3 are formed between the ON section and the OQ section of the membrane page, the front side (raw water side) of the first membrane unit 2 and the front side (raw water side) of the second membrane unit 3 are formed between the MN section and the PQ section of the membrane page, the front side (raw water side) of the membrane page is sealed at O (at the water collecting pipe 1) by folding, gluing or the like, preferably, the front side (raw water side) of the membrane page is sealed at C (at the water collecting pipe 1) by folding, the back side (pure water side) of the membrane page is sealed at N, Q by folding, gluing or the like, preferably, the back side (pure water side) of the membrane page is sealed at N, Q by folding, the front side (raw water side) of the membrane page is sealed at N, Q by water-proof adhesive tape, preferably, the water-proof adhesive tape can be blue adhesive tape.

[0066] Referring to Figure 15 As shown, if the number of the first membrane units 2 and the number of the second membrane units 3 are both multiple pages, in addition to the raw water flow channel being formed between the front sides of adjacent first membrane units 2 and second membrane units 3, the raw water flow channel is also formed between the front sides of adjacent first membrane units 2 and between the front sides of adjacent second membrane units 3, and the pure water flow channel is also formed between the back sides of adjacent first membrane units 2 and second membrane units 3. Since the raw water flow channel is also formed between the front sides of adjacent first membrane units 2 and second membrane units 3, this will cause the pure water flowing out of the pure water outlet 25 of the first membrane unit in the unfolded state to re-enter the raw water inlet 33 of the second membrane unit in the unfolded state, and form a part of mixed water with the raw water between the front sides of adjacent first membrane units 2 and second membrane units 3, thereby affecting the TDS value of the water outlet of the entire membrane element. In order to further reduce the TDS value of the water outlet of the entire membrane element, the front sides of adjacent first membrane units 2 and second membrane units 3 are also sealed. Figure 16 is a front view of one end of the raw water flow channel side of the membrane element in the unfolded state (end formed by the fourth side edge), Figure 17 is a front view of the other end of the raw water flow channel side of the membrane element in the unfolded state (end formed by the third side edge), Figure 18 is a front view of one end of the pure water flow channel side of the membrane element in the unfolded state (end formed by the fourth side edge), Figure 19 is a front view of the other end of the pure water flow channel side of the membrane element in the unfolded state (end formed by the third side edge), referring to Figure 16 As shown, the front sides of adjacent first membrane units 2 and second membrane units 3 (RS section and TS section, UV section and WV section) are also sealed by adhesive. Similarly, referring to Figure 17As shown, the front faces of the adjacent first membrane unit 2 and second membrane unit 3 are also sealed by adhesive. As shown by reference 18, the pure water outlet 25 of the first membrane unit in the unwound state is sealed by adhesive (XY section) at the pure water outlet 25 of the first membrane unit 2, so that the pure water outlet 25 of the first membrane unit in the unwound state is not in communication with the water collecting pipe 1. As shown by reference Figure 19 As shown, the pure water outlet 25 of the first membrane unit in the unwound state is formed on the third side edge 29 of the first membrane unit. Figure 20 As shown, the front faces of the adjacent first membrane unit 2 and second membrane unit 3 are also sealed by adhesive, so that the pure water flowing out of the pure water outlet 25 of the first membrane unit in the unwound state can only enter between the raw water inlets 33 of the second membrane unit in the unwound state formed by the adjacent second membrane unit 3, so as to isolate the pure water produced by the first membrane unit 2 from the raw water, which is conducive to further reducing the TDS value of the water outlet of the membrane element.

[0067] In this application, the raw water flow channels of the first membrane unit 2 and the second membrane unit 3 are spirally extended along the circumferential direction of the water collecting pipe 1. Figure 11 As shown, in the wound state, the pure water outlet 10 of the first membrane unit in the wound state is located on the circumferential surface of the front face of the membrane element, the raw water inlet 11 of the second membrane unit in the wound state is located on the circumferential surface of the front face of the membrane element, the waste water outlet 9 of the first membrane unit in the wound state is located on the circumferential surface of the front face of the membrane element, the pure water outlet 10 of the first membrane unit in the wound state is in communication with the raw water inlet 11 of the second membrane unit in the wound state, and the pure water outlet 10 of the first membrane unit in the wound state, the waste water outlet 9 of the first membrane unit in the wound state, and the pure water outlet 10 of the first membrane unit in the wound state are all located at one end of the membrane element. Figure 12 As shown, in the wound state, the waste water outlet 13 of the second membrane unit in the wound state is located on the circumferential surface of the front face of the membrane element, the raw water inlet 12 of the first membrane unit in the wound state is located on the circumferential surface of the front face of the membrane element, and the waste water outlet 13 of the second membrane unit in the wound state and the raw water inlet 12 of the first membrane unit in the wound state are both located at the other end of the membrane element.

[0068] As shown by reference Figure 1 , Figure 2 and Figure 3As shown, when the membrane element is in the unfolded state, the membrane element has a first side (left side in the figure) and a second side (right side in the figure), a third side (lower side in the figure) and a fourth side (upper side in the figure), wherein the first side and the second side are oppositely arranged, and the third side and the fourth side are oppositely arranged. The third side and the fourth side are connected with the first side and the second side respectively. Wherein, the side of the first membrane unit 2 and the second membrane unit 3 connected with the water collecting pipe 1 is the first side of the membrane element. Wherein, the pure water outlet of the second membrane unit 3 is connected with the water collecting pipe 1 located at the first side. Thus, the pure water produced from the second membrane unit 3 can be led out from the water collecting pipe 1. The pure water outlet of the first membrane unit in the unfolded state and the raw water inlet of the second membrane unit in the unfolded state are located at the third side when unfolded. When the membrane element is in the unfolded state, the raw water flow path of the first membrane unit 2 and the second membrane unit 3 extends along the length direction of the membrane element.

[0069] Referring to Figure 13 and Figure 14 As shown, when the membrane element is in the rolled state, the membrane element has a first end (upper end in the figure) and a second end (lower end in the figure) which are oppositely arranged along the axis direction of the water collecting pipe 1. The raw water inlet of the first membrane unit in the rolled state and the waste water outlet of the second membrane unit in the rolled state are located at the first end of the membrane element, and the waste water outlet of the first membrane unit in the rolled state, the pure water outlet of the first membrane unit in the rolled state and the raw water inlet of the second membrane unit in the rolled state are located at the second end of the membrane element. Specifically, in order to extend the raw water flow path of the first membrane unit 2 as much as possible, referring to Figure 1 , Figure 2 and Figure 3 As shown, the raw water inlet of the first membrane unit in the unfolded state can be arranged at the fourth side 28 close to the first side 26 of the first membrane unit, and the waste water outlet of the first membrane unit in the unfolded state can be arranged at the third side 29 close to the second side 27 of the first membrane unit. Similarly, in order to extend the raw water flow path of the second membrane unit 3 as much as possible, the raw water inlet of the second membrane unit in the unfolded state can be arranged at the third side 38 close to the first side 35 of the second membrane unit, and the waste water outlet of the second membrane unit in the unfolded state can be arranged at the fourth side 37 close to the second side 36 of the second membrane unit.

[0070] Referring to Figure 1 and Figure 3As shown, the fourth side edge 28 of the raw water flow channel side 21 of the first membrane unit is sealed except for the portion (AB section) other than the raw water inlet 23 of the first membrane unit in the unfolded state, the third side edge 29 of the raw water flow channel side 21 of the first membrane unit is sealed except for the portion (CD section) other than the waste water outlet 24 of the first membrane unit in the unfolded state, the first side edge 26 of the raw water flow channel side 21 of the first membrane unit and the second side edge 27 of the raw water flow channel side 21 of the first membrane unit are sealed; the fourth side edge 37 of the raw water flow channel side 31 of the second membrane unit is sealed except for the portion (IJ section) other than the waste water outlet 34 of the second membrane unit 3 in the unfolded state, the third side edge 38 of the raw water flow channel side 31 of the second membrane unit is sealed except for the portion (KL section) other than the raw water inlet 33 of the second membrane unit in the unfolded state, the first side edge 35 of the raw water flow channel side 31 of the second membrane unit and the second side edge 36 of the raw water flow channel side 31 of the second membrane unit are sealed; the first side edge 26 of the raw water flow channel side 21 of the first membrane unit is sealed by folding, and the first side edge 35 of the raw water flow channel side 31 of the second membrane unit is sealed by folding. The second side edge 27 of the raw water flow channel side 21 of the first membrane unit is sealed by a waterproof adhesive tape, and the second side edge 36 of the raw water flow channel side 31 of the second membrane unit is sealed by a waterproof adhesive tape. The fourth side edge 28 (EF section) of the pure water flow channel side 22 of the first membrane unit is sealed, the third side edge 29 of the pure water flow channel side 22 of the first membrane unit is sealed except for the portion (GH section) other than the pure water outlet 25 of the first membrane unit in the unfolded state, the first side edge 26 of the pure water flow channel side 22 of the first membrane unit is sealed, and the second side edge 27 of the pure water flow channel side 22 of the first membrane unit is sealed, so that the pure water produced by the first membrane unit 2 is not communicated with the water collecting pipe 1 by sealing the first side edge 26 of the pure water flow channel side 22 of the first membrane unit, the fourth side edge 37 (MN section) of the pure water flow channel side 32 of the second membrane unit is sealed, the second side edge 36 of the pure water flow channel side 32 of the second membrane unit is sealed, and the third side edge 38 (OP section) of the pure water flow channel side 32 of the second membrane unit is sealed, so that only the pure water produced by the second membrane unit 3 is communicated with the water collecting pipe 1. The second side edge 27 of the pure water flow channel side 22 of the first membrane unit is sealed by folding, and the second side edge 36 of the pure water flow channel side 32 of the second membrane unit is sealed by folding.

[0071] Referring to Figure 13 and Figure 14 As shown, the membrane element further comprises a first end cover 5 and a second end cover 4 arranged at both ends of the water collecting pipe 1. Referring to Figure 1 , Figure 2 and Figure 3As shown, the fourth side 28 of the raw water channel side 21 of the first membrane unit, excluding the portion of the raw water inlet 23 of the first membrane unit in the deployed state, and the fourth side 37 of the raw water channel side 31 of the second membrane unit, excluding the portion of the wastewater outlet 34 of the second membrane unit in the deployed state, are sealed by applying adhesive between the first end cap 5 and the end of the membrane element. Similarly, the third side 29 of the raw water channel side 21 of the first membrane unit, excluding the portion of the wastewater outlet 24 of the first membrane unit in the deployed state, and the third side 38 of the raw water channel side 31 of the second membrane unit, excluding the portion of the raw water inlet 33 of the second membrane unit in the deployed state, are sealed by applying adhesive between the second end cap 4 and the end of the membrane element. It is worth noting that in this application, sealing by the end cap generally refers to applying adhesive to the wall surface of the end cap and bonding it to the end of the membrane unit. The second side 27 of the raw water channel side 21 of the first membrane unit and the second side 36 of the raw water channel side 31 of the second membrane unit are sealed by wrapping the outer peripheral surface of the membrane element with waterproof tape, such as blue tape.

[0072] Reference Figure 3 As shown, the fourth side 28 of the pure water flow channel side 22 of the first membrane unit, the third side 29 of the pure water flow channel side 22 of the first membrane unit excluding the portion of the pure water outlet 25 of the first membrane unit, and the first side 26 of the pure water flow channel side 22 of the first membrane unit are sealed by applying adhesive to the membrane surface; the fourth side 37 and the third side 38 of the pure water flow channel side 32 of the second membrane unit are sealed by applying adhesive to the membrane surface.

[0073] Reference Figure 6 and Figure 7 As shown, the second end cap 4 is fitted onto the second end (lower end) of the membrane element. The second end cap 4 includes a sleeve portion 41 for fitting onto the end of the membrane element and a body 42 located at one end of the sleeve portion. The sleeve portion 41 is a cylindrical structure fitted onto the end of the membrane element to fix the position of the end cap. The body 42 is the main body of the second end cap 4. An adhesive is used to seal the end of the membrane element at the second end by gluing the body 42. (Refer to...) Figure 11 As shown, since the second end of the membrane element is provided with the pure water outlet 10 of the first membrane unit in the wound state, the raw water inlet 11 of the second membrane unit in the wound state, and the wastewater outlet 9 of the first membrane unit in the wound state, the sealing of the third side of the membrane element and the opening of the third side are achieved by setting the glued area and the non-glued area on the body 42 of the second end cap.

[0074] The inner surface of the body 42 of the second end cover is provided with the first rib 44 and the second rib 45, which are strip-shaped structures protruding from the inner surface of the body 42 of the second end cover, and which, in cooperation with the sleeve part 41 of the second end cover, divide the inner surface of the body 42 of the second end cover into three functional areas. The first area 46 is formed by the connection of the first rib 44 and part of the edge of the sleeve part 41 of the second end cover, and corresponds to the wastewater outlet 9 of the first membrane unit in the coiled state. In other words, the wastewater outlet 9 of the first membrane unit in the coiled state is also the membrane unit end portion corresponding to the first area 46. By not applying glue to the first area 46, a first channel is formed between the first area 46 and the wastewater outlet 9 of the first membrane unit in the coiled state, through which the wastewater flowing out of the wastewater outlet 9 of the first membrane unit in the coiled state flows out of the membrane element.

[0075] The central area of the body 42 of the second end cover extends downward at least partially to form a groove 43, which is an annular downwardly protruding channel. The second area 47 is a closed area formed by the second rib 45 surrounding part of the edge of the groove 43, and corresponds to the raw water inlet 11 of the second membrane unit in the coiled state and the pure water outlet 10 of the first membrane unit in the coiled state. In other words, the raw water inlet 11 of the second membrane unit in the coiled state and the pure water outlet 10 of the first membrane unit in the coiled state are also the membrane unit end portions corresponding to the second area 47. By not applying glue to the second area 47, a second channel is formed between the second area 47 and the raw water inlet 11 of the second membrane unit in the coiled state and the pure water outlet 10 of the first membrane unit in the coiled state, through which the pure water flowing out of the pure water outlet 10 of the first membrane unit in the coiled state flows into the raw water inlet 11 of the second membrane unit in the coiled state. The second channel includes the channel formed by the groove 43, which does not cause flow restriction of the pure water flowing into the raw water inlet 11 of the second membrane unit in the coiled state, and provides a larger water flow channel as much as possible, and introduces the pure water flowing out of the pure water outlet 10 of the first membrane unit in the coiled state into the raw water inlet 11 of the second membrane unit in the coiled state without flow restriction.

[0076] The body 42 of the second end cover is the third region 48 except the first region 46 and the rest of the second region 47, which corresponds to the third side edge 29 of the raw water flow channel side 21 of the first membrane unit except the part of the wastewater outlet 24 of the first membrane unit in the unfolded state and the part of the third side edge 38 of the raw water flow channel side 31 of the second membrane unit except the raw water inlet 33 of the second membrane unit in the unfolded state, in other words, the third side edge 29 of the raw water flow channel side 21 of the first membrane unit except the part of the wastewater outlet 24 of the first membrane unit in the unfolded state and the third side edge 38 of the raw water flow channel side 31 of the second membrane unit except the raw water inlet 33 of the second membrane unit in the unfolded state is also the membrane unit end corresponding to the third region 48. By gluing in the third region 48, the third side edge 29 of the raw water flow channel side 21 of the first membrane unit except the part of the wastewater outlet 24 of the first membrane unit in the unfolded state and the third side edge 38 of the raw water flow channel side 31 of the second membrane unit except the raw water inlet 33 of the second membrane unit in the unfolded state are sealed.

[0077] Referring to Figure 8 , Figure 9 and Figure 10 , the first end cover 5 is sleeved on the first end (upper end in the figure) of the membrane element, and the first end cover 5 includes a sleeve part 51 of the first end cover for sleeving with the end of the membrane element and a body 52 of the first end cover located at one end of the sleeve part. Since the first end of the membrane element is provided with the raw water inlet 12 of the first membrane unit in the coiled state and the wastewater outlet 13 of the second membrane unit in the coiled state, by the arrangement of the glued region and the non-glued region on the body 52 of the first end cover, the sealing of the partial fourth side edge of the membrane element and the opening of the partial fourth side edge are realized.

[0078] The inner surface of the body 52 of the first end cover is convexly provided with the third rib 53 and the fourth rib 54, which are strip-shaped structures protruding from the inner surface of the body 52 of the first end cover. The third rib 53 and the fourth rib 54 divide the inner surface of the body 52 of the first end cover into three functional regions. The fourth region 55 is formed by the third rib 53, and the fourth region 55 corresponds to the wastewater outlet 13 of the second membrane unit in the coiled state, in other words, the wastewater outlet 13 of the second membrane unit in the coiled state is also the membrane unit end corresponding to the fourth region 55. By not gluing in the fourth region 55, a third channel is formed between the fourth region 55 and the wastewater outlet 13 of the second membrane unit in the coiled state, and the wastewater flowing out of the wastewater outlet 13 of the second membrane unit in the coiled state flows out of the membrane element through the third channel.

[0079] The central region of the body of the first end cap extends upwardly at least partially to form a first annular flange 7 and a second annular flange 6 which is sleeved outside the first annular flange 7, at least part of the fourth rib 54 forms a fifth region 56 around the edge of at least part of the first annular flange 7, the fifth region 56 corresponds to the raw water inlet 12 of the first membrane unit in the coiled state, in other words, the raw water inlet 12 of the first membrane unit in the coiled state is also the membrane unit end portion corresponding to the fifth region 56. By not gluing in the fifth region 56, a fourth channel is formed between the fifth region 56 and the raw water inlet 12 of the first membrane unit in the coiled state, and external raw water flows into the raw water inlet 12 of the first membrane unit in the coiled state through the fourth channel.

[0080] The rest of the body 52 of the first end cap 5, except for the fourth region 55 and the fifth region 56, is the sixth region 57, which corresponds to the fourth side edge 28 of the raw water channel side 21 of the first membrane unit, except for the part of the raw water inlet 23 of the first membrane unit in the unfolded state and the fourth side edge 37 of the raw water channel side 31 of the second membrane unit, except for the part of the wastewater outlet 34 of the second membrane unit in the unfolded state, in other words, the fourth side edge 28 of the raw water channel side 21 of the first membrane unit, except for the part of the raw water inlet 23 of the first membrane unit in the unfolded state and the fourth side edge 37 of the raw water channel side 31 of the second membrane unit, except for the part of the wastewater outlet 34 of the second membrane unit in the unfolded state, is also the membrane unit end portion corresponding to the sixth region 57. By gluing in the sixth region 57, the part of the fourth side edge 28 of the raw water channel side 21 of the first membrane unit, except for the part of the raw water inlet 23 of the first membrane unit in the unfolded state, and the part of the fourth side edge 37 of the raw water channel side 31 of the second membrane unit, except for the part of the wastewater outlet 34 of the second membrane unit in the unfolded state, is sealed.

[0081] Referring to Figure 14As shown, one end of the water collecting pipe 1 is sealed, and the other end is open. The inside of the water collecting pipe 1 forms a pure water flow channel 18. The pure water produced by the second membrane unit 3 is discharged through the inside of the water collecting pipe 1. The open end of the water collecting pipe 1 penetrates through the first annular flange 7. The outside wall of the water collecting pipe 1 and the inside wall of the first annular flange 7 form a raw water flow channel 19. The raw water flow channel 19 is connected to the raw water inlet 12 of the first membrane unit in the coiled state. The outside raw water flows into the fourth channel through the raw water flow channel 19, and then flows into the raw water inlet 12 of the first membrane unit in the coiled state from the fourth channel. The outside wall of the first annular flange 7 and the inside wall of the second annular flange 6 form an annular channel. The annular channel forms a first waste water flow channel 17. The first waste water flow channel 17 is connected to the waste water outlet 13 of the second membrane unit in the coiled state. The first end cover 5 is provided with a through hole 551 on the inner surface of the fourth area 55. The third channel is connected to the waste water outlet 13 of the second membrane unit in the coiled state through the through hole 551. The body 52 of the first end cover has a radial channel 8. One end of the channel 8 is connected to the through hole 551. The other end of the channel 8 is connected to the first waste water flow channel 17. The waste water produced by the second membrane unit 3 flows through the through hole 551, the third channel, the radial channel 8, and then the first waste water flow channel 17. Finally, the waste water flows out of the membrane element from the first waste water flow channel 17.

[0082] In addition, a filter core is also proposed in the present application. Referring to Figure 21 As shown, the filter core includes any of the above membrane elements and a shell. The outer circumferential surface of the membrane element is wrapped with a water-impermeable tape. The water-impermeable tape and the inner wall surface of the shell form a second waste water flow channel 15. The second waste water flow channel 15 is connected to the waste water outlet 9 of the first membrane unit in the coiled state. The waste water produced by the first membrane unit 2 flows through the first channel, and then flows into the second waste water flow channel 15. Finally, the waste water flows out through the second waste water outlet 161 on the shell. In addition, the shell is provided with a pure water outlet 162 connected to the water collecting pipe 1, a first waste water outlet 164 connected to the first waste water flow channel, and a raw water inlet 163 connected to the raw water flow channel. Further, the shell includes a bottle body 14 and a cover body 16. The cover body 16 covers the top of the bottle body 14. The cover body 16 is provided with the pure water outlet 162, the first waste water outlet 164, the second waste water outlet 161, and the raw water inlet 163.

[0083] All articles and references, including patent applications and publications, disclosed herein are hereby incorporated by reference for all purposes. The term "consisting essentially of to describe a combination shall include the elements, ingredients, components or steps identified, and such other elements, ingredients, components or steps that do not materially affect the basic and novel characteristics of the combination. The use of the term "comprising" or "including" to describe combinations of elements, ingredients, components or steps herein also is taken to mean that other elements, ingredients, components or steps are optional, and not excluded. By using the term "can" herein, it is intended that any property described is optional. Multiple elements, ingredients, components or steps can be provided by a single integrated element, ingredient, component or step. Alternatively, a single integrated element, ingredient, component or step can be divided into separate multiple elements, ingredients, components or steps. Any use of the term "or" in the description is used in the sense that the word is used in genetic biology, i.e., the term "or" means either but not both, for example, a condition is met if A is true, or B is true, or if both A and B are true. The use of the term "about" means that variations of 20%, 10%, 5%, 1%, or 0.5% are included, for example, "about 90%" means 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99%.

[0084] The embodiments disclosed in the specification are illustrative of the inventive concept and are not intended to limit the scope of the application. The embodiments disclosed in the specification are not exhaustive of the ways in which the inventive concept can be embodied and are not intended to limit the scope of the application. Variations and modifications of the embodiments disclosed in the specification can be made based on the inventive concept as set forth in the claims.

Claims

1. A membrane element characterized in that, The membrane element comprises: a water collecting pipe having a through hole formed in a pipe wall thereof, the water collecting pipe collecting pure water inside the water collecting pipe through the through hole; a first membrane unit and a second membrane unit rolled on the water collecting pipe, the first membrane unit and the second membrane unit being arranged in a stacked manner in an unfolded state of the membrane element; a pure water outlet of the first membrane unit being in communication with a raw water inlet of the second membrane unit, the pure water outlet of the first membrane unit and the raw water inlet of the second membrane unit being located on the same side in an axial extension direction of the water collecting pipe when the first membrane unit and the second membrane unit are in the unfolded state; the pure water outlet of the first membrane unit not being in communication with the through hole of the water collecting pipe, and the pure water outlet of the second membrane unit being in communication with the through hole of the water collecting pipe.

2. The membrane element according to claim 1, wherein the membrane element has a first side connected with the water collecting pipe and a second side opposite to the first side in the unfolded state, and has a third side and a fourth side opposite to each other and connected with the first side and the second side respectively, the pure water outlet of the first membrane unit and the raw water inlet of the second membrane unit being located close to the third side when unfolded.

3. The membrane element according to claim 2, wherein the raw water inlet of the first membrane unit is located close to the fourth side, the waste water outlet of the first membrane unit is located close to the third side, and the waste water outlet of the second membrane unit is located close to the fourth side.

4. The membrane element according to claim 3, wherein the fourth side of the raw water flow channel side of the first membrane unit is sealed except for the raw water inlet of the first membrane unit, the third side of the raw water flow channel side of the first membrane unit is sealed except for the waste water outlet of the first membrane unit, and the first side and the second side of the raw water flow channel side of the first membrane unit are sealed; the fourth side of the raw water flow channel side of the second membrane unit is sealed except for the waste water outlet of the second membrane unit, the third side of the raw water flow channel side of the second membrane unit is sealed except for the raw water inlet of the second membrane unit, and the first side and the second side of the raw water flow channel side of the second membrane unit are sealed.

5. The membrane element according to claim 4, wherein the fourth side of the pure water flow channel side of the first membrane unit is sealed, the third side of the pure water flow channel side of the first membrane unit is sealed except for the pure water outlet of the first membrane unit, and the first side and the second side of the pure water flow channel side of the first membrane unit are sealed; the fourth side of the pure water flow channel side of the second membrane unit is sealed, the third side of the pure water flow channel side of the second membrane unit is sealed, and the second side of the pure water flow channel side of the second membrane unit is sealed.

6. The membrane element according to claim 5, wherein In the rolled state, the wastewater outlet of the first membrane unit, the pure water outlet of the first membrane unit and the raw water inlet of the second membrane unit are located at one end of the membrane element, and the raw water inlet of the first membrane unit and the wastewater outlet of the second membrane unit are located at the other end of the membrane element.

7. The membrane element according to claim 6, wherein, the membrane element further comprises a first end cover and a second end cover arranged at both ends of the water collecting pipe and a waterproof tape arranged on the outer circumferential surface of the membrane element; in the rolled state, the fourth side edge of the raw water flow channel of the first membrane unit, except for the part of the raw water inlet of the first membrane unit, and the fourth side edge of the raw water flow channel of the second membrane unit, except for the part of the wastewater outlet of the second membrane unit, are sealed by gluing between the first end cover and the end of the membrane element; in the rolled state, the third side edge of the raw water flow channel of the first membrane unit, except for the part of the wastewater outlet of the first membrane unit, and the third side edge of the raw water flow channel of the second membrane unit, except for the part of the raw water inlet of the second membrane unit, are sealed by gluing between the second end cover and the end of the membrane element; in the rolled state, the second side edge of the raw water flow channel of the first membrane unit and the second side edge of the raw water flow channel of the second membrane unit are sealed by wrapping the waterproof tape on the outer circumferential surface of the membrane element; in the unrolled state, the fourth side edge of the pure water flow channel of the first membrane unit, the third side edge of the pure water flow channel of the first membrane unit, except for the part of the pure water outlet of the first membrane unit, and the first side edge of the pure water flow channel of the first membrane unit are sealed by gluing on the membrane surface; in the unrolled state, the fourth side edge of the pure water flow channel of the second membrane unit and the third side edge of the pure water flow channel of the second membrane unit are sealed by gluing on the membrane surface.

8. The membrane element according to claim 7, wherein, the second end cover comprises a sleeve portion for sleeving with the end of the membrane element and a body located at one end of the sleeve portion, and a recess is formed in the central region of the second end cover body by extending downward at least partially; the inner surface of the second end cover body is convexly provided with a first rib and a second rib, and the first rib, the second rib and at least part of the sleeve portion cooperatively divide the inner surface of the second end cover body into three regions, the first rib and at least part of the sleeve portion form a first region, at least part of the second rib forms a second region around the edge of at least part of the recess, and the remaining region of the inner surface of the second end cover body, except for the first region and the second region, forms a third region, the first region and the second region are non-gluing regions, and the third region is a gluing region.

9. The membrane element according to claim 8, wherein, In the rolled state, the third region corresponds to a third side of the raw water flow channel side of the first membrane unit excluding the wastewater outlet of the first membrane unit and a third side of the raw water flow channel side of the second membrane unit excluding the raw water inlet of the second membrane unit, and the third region and the membrane unit end portion corresponding to the third region are sealed by adhesive; In the rolled state, the first region corresponds to the wastewater outlet of the first membrane unit, and the first region and the membrane unit end portion corresponding to the first region are not sealed by adhesive to form a first passage communicating with the wastewater outlet of the first membrane unit; In the rolled state, the second region corresponds to the raw water inlet of the second membrane unit and the pure water outlet of the first membrane unit, and the second region and the membrane unit end portion corresponding to the second region are not sealed by adhesive to form a second passage communicating with the raw water inlet of the second membrane unit and the pure water outlet of the first membrane unit, and the pure water flowing out of the pure water outlet of the first membrane unit flows into the raw water inlet of the second membrane unit through the second passage.

10. The membrane element according to claim 7, wherein the first end cover comprises a sleeve portion for sleeving the end portion of the membrane element and a body at one end of the sleeve portion, and a central region of the first end cover body extends upward at least partially to form a first annular flange and a second annular flange sleeved outside the first annular flange; the inner surface of the first end cover body is convexly provided with a third rib and a fourth rib, and the third rib and the fourth rib cooperate to divide the inner surface of the first end cover body into three regions, the third rib surrounds to form a fourth region, at least part of the fourth rib surrounds the edge of at least part of the first annular flange to form a fifth region, and the inner surface of the body forms a sixth region except the fourth region and the fifth region, the fourth region and the fifth region are non-adhesive regions, and the sixth region is an adhesive region.

11. The membrane element according to claim 10, wherein in the rolled state, the sixth region corresponds to a fourth side of the raw water flow channel side of the first membrane unit excluding the raw water inlet of the first membrane unit and a fourth side of the raw water flow channel side of the second membrane unit excluding the wastewater outlet of the second membrane unit, and the sixth region and the membrane unit end portion corresponding to the sixth region are sealed by adhesive to seal the fourth side of the raw water flow channel side of the first membrane unit excluding the raw water inlet of the first membrane unit and the fourth side of the raw water flow channel side of the second membrane unit excluding the wastewater outlet of the second membrane unit. In the rolled state, the fourth region corresponds to the wastewater outlet of the second membrane unit, and no glue is applied between the fourth region and the membrane unit end corresponding to the fourth region to form a third channel, which is in communication with the wastewater outlet of the second membrane unit; In the rolled state, the fifth region corresponds to the raw water inlet of the first membrane unit, and no glue is applied between the fifth region and the membrane unit end corresponding to the fifth region to form a fourth channel, which is in communication with the raw water inlet of the first membrane unit.

12. The membrane element according to claim 11, wherein The first end cap is provided with a through hole on the inner surface of the fourth region, the third channel is in communication with the wastewater outlet of the second membrane unit through the through hole, and the body of the first end cap has a radially extending channel, one end of the channel is in communication with the through hole, and the other end of the channel is in communication with the annular channel formed by the outer side wall of the first annular flange and the inner side wall of the second annular flange.

13. The membrane element according to claim 12, wherein The water collecting pipe penetrates through the first annular flange, a pure water flow channel is formed in the water collecting pipe, a raw water flow channel is formed by the outer side wall of the water collecting pipe and the inner side wall of the first annular flange, the annular channel forms a first wastewater flow channel, the raw water flow channel is in communication with the raw water inlet of the first membrane unit, and the first wastewater flow channel is in communication with the wastewater outlet of the second membrane unit.

14. A filter cartridge, comprising the membrane element according to any one of claims 1 to 13; and The outer shell is used for accommodating the membrane element, a second wastewater flow channel is formed between the outer peripheral surface of the membrane element and the outer shell, the second wastewater flow channel is in communication with the wastewater outlet of the first membrane unit, and the outer shell is provided with a pure water outlet in communication with the water collecting pipe; a first wastewater outlet in communication with the first wastewater flow channel, a second wastewater outlet in communication with the second wastewater flow channel, and a raw water inlet in communication with the raw water flow channel.

15. The filter cartridge according to claim 14, wherein The outer shell comprises a bottle body and a cover body, the cover body covers the top of the bottle body, and the cover body is provided with the pure water outlet, the first wastewater outlet, the second wastewater outlet and the raw water inlet. ​ ​

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