Reverse osmosis element end caps, reverse osmosis filters and water purification systems

Abstract

The present invention relates to a reverse osmosis element end cover, a reverse osmosis filter and a water purification system. The reverse osmosis element end cover comprises a cover body that can be covered on the end face of the reverse osmosis element. The bottom wall of the cover body comprises an installation through hole, a sealing area and an annular raw water inlet area. The installation through hole is used for a concentrated water pipe to pass through. The sealing area is arranged outside the installation through hole. The raw water inlet area is arranged around the periphery of the sealing area. The sealing area is used for gluing and sealing with the end face of the reverse osmosis membrane group of the reverse osmosis element. The raw water inlet area is provided with a raw water port, and the raw water port is arranged corresponding to the raw water inlet of the reverse osmosis membrane group. Thus, the forward path of the raw water in the water production process is the long side, and the water production efficiency is high. The concentrated water side is close to the concentrated water pipe, and the tangential velocity of the water flow in the raw water flow channel is high at the position close to the concentrated water pipe, thereby effectively improving the concentration polarization phenomenon and extending the service life.

Description

Technical Field

[0001] The invention relates to the field of water purification, in particular to a reverse osmosis element end cover, a reverse osmosis filter and a water purification system. Background Art

[0002] In the field of water purification, impurities in water are generally filtered out through the filtering effect of various filter membranes so that the water quality for users meets the use requirements. The reverse osmosis membrane element uses the filtering effect of the reverse osmosis membrane to allow water molecules in the raw water flow channel to penetrate through the reverse osmosis membrane under pressure, forming pure water on the pure water side of the reverse osmosis membrane for users to use; while the concentration of impurities in the raw water flow channel increases along the direction of water flow, so that concentration polarization is likely to occur on the concentrated water side, affecting the service life of the reverse osmosis membrane element. Summary of the invention

[0003] Based on this, it is necessary to provide a reverse osmosis element end cover, a reverse osmosis filter and a water purification system to improve the concentration polarization phenomenon and extend the service life.

[0004] A reverse osmosis element end cover comprises a cover body that can be covered on the end face of the reverse osmosis element, the bottom wall of the cover body comprises an installation through hole, a sealing area and an annular raw water inlet area, the installation through hole is used for a concentrated water pipe to pass through, the sealing area is arranged outside the installation through hole, the raw water inlet area is arranged around the periphery of the sealing area, the sealing area is used for gluing and sealing with the end face of a reverse osmosis membrane group of the reverse osmosis element, the raw water inlet area is provided with a raw water inlet, and the raw water inlet is arranged corresponding to the raw water inlet of the reverse osmosis membrane group.

[0005] The above scheme provides a reverse osmosis element end cover, which seals the reverse osmosis membrane group provided with the end cover, and guides the water inlet and outlet by setting the installation through hole, sealing area and annular raw water inlet area on the bottom wall of the cover body. Specifically, glue is applied between the sealing area and the end face of the reverse osmosis membrane group to seal, so that the raw water inlet of the reverse osmosis membrane group is formed at the end face and close to the outer side. After the raw water enters the raw water inlet, it spirals forward in the raw water flow channel, and the concentrated water obtained after filtration is discharged from the concentrated water pipe, and the installation through hole on the cover body is used for the concentrated water pipe to pass through. As a result, the forward path of the raw water in the water production process is the long side of the raw water flow channel, and the water production efficiency is higher. The concentrated water side is close to the concentrated water pipe, and the tangential velocity of the water flow in the raw water flow channel is higher at the position close to the concentrated water pipe, thereby effectively improving the concentration polarization phenomenon and extending the service life.

[0006] In one of the embodiments, an annular raised rib is provided on the inner side of the bottom wall of the cover body, the raised rib is located between the sealing area and the raw water inlet area, and the raised rib can abut and seal against the end surface of the reverse osmosis membrane group.

[0007] In one of the embodiments, a raised rib is provided on the inner side of the bottom wall of the cover body, the raised rib surrounds the outside of the raw water inlet, and the raised rib can abut and seal against the end surface of the reverse osmosis membrane group.

[0008] In one of the embodiments, there are multiple raw water inlets, and the multiple raw water inlets are arranged at intervals in the circumferential direction of the cover body.

[0009] In one embodiment, the length of the raw water inlet in the circumferential direction of the cover body is h, the length of the raw water flow channel of the reverse osmosis membrane assembly in the circumferential direction is L, and 1 / 15≤h / L≤1 / 2.

[0010] In one of the embodiments, the radial thickness of the sealing area is r, the sum of the radial thicknesses of the raw water inlet area and the sealing area is R, and 2 / 3≤r / R<1.

[0011] In one embodiment, the side wall of the cover is bonded and sealed to the outer side of the reverse osmosis membrane element.

[0012] A reverse osmosis filter comprises a reverse osmosis element and the reverse osmosis element end cover, wherein the cover body is arranged on the end surface of the reverse osmosis element, the reverse osmosis element comprises a concentrate water pipe and a reverse osmosis membrane group rolled on the concentrate water pipe, the raw water flow channel of the reverse osmosis membrane group is connected with the concentrate water pipe, the sealing area of ​​the cover body is sealed with the end surface of the reverse osmosis membrane group, the raw water inlet of the reverse osmosis membrane group corresponds to the raw water port, and one end of the concentrate water pipe passes through the mounting through hole.

[0013] The above scheme provides a reverse osmosis filter, by setting the reverse osmosis element end cover described in any of the above embodiments, and the concentrate pipe and reverse osmosis membrane group corresponding to the cover body in the reverse osmosis filter, so that in the process of water production, raw water enters from the raw water inlet of the end face and is discharged from the concentrate pipe in the middle, that is, the raw water is filtered along the long side, thereby improving the water production efficiency. In addition, the concentrate side formed in the water production process is close to the concentrate pipe, and the tangential flow velocity in the raw water flow channel close to the concentrate pipe is higher, thereby alleviating the concentration polarization phenomenon on the concentrate side.

[0014] In one embodiment, the pure water outlet of the reverse osmosis membrane group is located on the outer side, and a filter element reinforcement is sleeved on the outer side of the reverse osmosis membrane group, and the filter element reinforcement is in contact with the outer side of the reverse osmosis membrane group.

[0015] In one of the embodiments, the filter element reinforcement is provided with a water hole, and the water hole passes through the side wall of the filter element reinforcement.

[0016] In one embodiment, the two end surfaces of the reverse osmosis element are provided with the cover bodies, and the filter element reinforcement is located between the two cover bodies.

[0017] In one embodiment, the reverse osmosis filter also includes a membrane shell sleeve and a membrane shell end cover, the membrane shell sleeve is sleeved outside the filter element reinforcement, and the membrane shell sleeve and the filter element reinforcement are spaced apart to form a pure water diversion cavity, the membrane shell end cover is provided with a first inlet, a first outlet and a second outlet, the membrane shell end cover is arranged outside the cover body, the first outlet is connected to the outlet of the concentrated water pipe, the first inlet is connected to the raw water inlet on the cover body, and the membrane shell end cover is connected to the membrane shell sleeve to form a flow channel connecting the second outlet and the pure water diversion cavity.

[0018] A water purification system comprises the reverse osmosis filter mentioned above.

[0019] The above scheme provides a water purification system, and by setting the reverse osmosis filter described in any of the above embodiments in the water purification system, the forward path of the raw water is the long side of the raw water flow channel during the water production process, thereby improving the water production efficiency. In addition, the concentrated water flows out from the concentrated water pipe, and the tangential velocity of the concentrated water flow is high near the concentrated water pipe, thereby effectively alleviating the concentration polarization phenomenon on the concentrated water side. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of the end cover of the reverse osmosis element according to this embodiment;

[0021] Figure 2 This is a schematic structural diagram of the reverse osmosis element end cover from another perspective of the present embodiment;

[0022] Figure 3 is a cross-sectional view of the reverse osmosis filter described in this embodiment;

[0023] Figure 4 An exploded view of a reverse osmosis filter according to another embodiment;

[0024] Figure 5 Bit Figure 4 A cross-sectional view of the reverse osmosis filter described in .

[0025] Description of reference numerals:

[0026] 10. Cover body; 11. Bottom wall; 111. Mounting through hole; 112. Sealing area; 113. Raw water inlet area; 1131. Raw water outlet; 114. Raised rib; 12. Side wall; 121. Limit reinforcement portion; 122. Guide slope; 20. Reverse osmosis filter; 21. Concentrated water pipe; 22. Reverse osmosis membrane group; 23. Filter element reinforcement; 231. Water hole; 24. Membrane shell sleeve; 241. Pure water guide chamber; 25. Membrane shell end cover; 251. First inlet; 252. First outlet; 253. Second outlet. DETAILED DESCRIPTION

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific implementation disclosed below.

[0028] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The various technical features of the above-described embodiments can be combined arbitrarily. In order to make the description concise, all possible combinations of the various technical features in the above-described embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0030] like Figure 1 and Figure 2 As shown, in one embodiment, a reverse osmosis element end cap is provided, comprising a cover body 10 that can be covered on the end surface of the reverse osmosis element, wherein the bottom wall 11 of the cover body 10 comprises a mounting through hole 111, a sealing area 112 and an annular raw water inlet area 113. Figure 3 As shown, the installation through hole 111 is used for the concentrated water pipe 21 to pass through. Figures 1 to 3As shown, the sealing area 112 is arranged outside the installation through hole 111, and the raw water inlet area 113 is arranged outside the sealing area 112. Figure 3 As shown, the sealing area 112 is used for gluing and sealing with the end surface of the reverse osmosis membrane group 22 of the reverse osmosis element, and the raw water inlet area 113 is provided with a raw water inlet 1131, and the raw water inlet 1131 is arranged corresponding to the raw water inlet of the reverse osmosis membrane group 22.

[0031] By providing the installation through hole 111, the sealing area 112 and the annular raw water inlet area 113 on the bottom wall 11 of the cover body 10, the reverse osmosis membrane group 22 provided with the end cover is sealed, and the water inlet and water outlet are guided. Specifically, the sealant is applied between the sealing area 112 and the end face of the reverse osmosis membrane group 22, so that the raw water inlet of the reverse osmosis membrane group 22 is formed at the end face and close to the outer side. After the raw water enters the raw water inlet, it spirals forward in the raw water flow channel, and the concentrated water obtained after filtration is discharged from the concentrated water pipe 21, and the installation through hole 111 on the cover body 10 is used for the concentrated water pipe 21 to pass through. As a result, the forward path of the raw water in the water production process is the long side, and the water production efficiency is higher. The concentrated water side is close to the concentrated water pipe 21, and the tangential velocity of the water flow in the raw water flow channel is higher at the position close to the concentrated water pipe 21, thereby effectively improving the concentration polarization phenomenon and extending the service life.

[0032] Furthermore, based on the high-pressure environment at the raw water inlet 1131 , in order to isolate the raw water inlet 1131 from the sealing area 112 , a protrusion may be provided between the two, so that the raw water passing through the raw water inlet 1131 will not enter the sealing area 112 .

[0033] Specifically, Figure 3 As shown, in one embodiment, an annular raised rib 114 is provided on the inner side of the bottom wall 11 of the cover body 10 , and the raised rib 114 is located between the sealing area 112 and the raw water inlet area 113 , and the raised rib 114 can abut and seal against the end face of the reverse osmosis membrane group 22 . Figure 1 The raised ribs 114 are not shown.

[0034] When the reverse osmosis element end cover is installed on the end surface of the reverse osmosis element, the raised rib 114 abuts against and seals the end surface of the reverse osmosis membrane group 22 , thereby achieving isolation and protection of the sealing area 112 .

[0035] Optionally, in one embodiment, the raised rib 114 may be surrounded outside the raw water inlet 1131 , and the raised rib 114 may be abutted and sealed against the end surface of the reverse osmosis membrane group 22 .

[0036] The raw water entering from the raw water inlet 1131 can reliably flow to the raw water inlet without flowing into the sealing area 112. At the same time, the raised ribs 114 surrounding the raw water inlet 1131 can also effectively prevent the raw water from flowing out from the gap between the side wall 12 of the cover body 10 and the reverse osmosis membrane group 22 and mixing with the pure water.

[0037] Further, in one embodiment, if Figure 1 and Figure 2 As shown, there are multiple raw water inlets 1131 , and the multiple raw water inlets 1131 are arranged at intervals in the circumferential direction of the cover body 10 .

[0038] Based on the fact that the reverse osmosis membrane group 22 can include multiple raw water flow channels during the manufacturing process, when the rolling is completed, the position close to the outer side surface on the end face will form multiple raw water inlets distributed along the circumferential direction, and the above-mentioned multiple raw water ports 1131 will better correspond to the raw water inlets, thereby ensuring that each raw water flow channel can participate in the water production process.

[0039] Furthermore, in one embodiment, the length of the raw water inlet 1131 in the circumferential direction of the cover body 10 is h, and the length of the long side of the raw water flow channel of the reverse osmosis membrane group 22 in the circumferential direction is L, and 1 / 15≤h / L≤1 / 2. That is, the circumferential length of the raw water inlet 1131 corresponding to each raw water inlet is between 1 / 15 and 1 / 2 of the circumferential length of the raw water flow channel. And each of the raw water inlets 1131 can correspond to multiple raw water inlets, or only one raw water inlet. Preferably, the raw water inlet 1131 corresponds one-to-one to the raw water inlet, so that when there are multiple raw water flow channels in the reverse osmosis membrane group 22, the sealing reliability of each pure water flow channel is higher.

[0040] Furthermore, in one embodiment, the radial thickness of the sealing area 112 is r, and the sum of the radial thicknesses of the raw water inlet area 113 and the sealing area 112 is R, then 2 / 3≤r / R<1.

[0041] By setting the size of the sealing area 112 and the raw water inlet 1131, the size of the raw water inlet in the reverse osmosis membrane group 22 is correspondingly limited, which improves the reliability of the pure water flow channel and the raw water flow channel sealing to a certain extent. Specifically, if the size of the raw water inlet is too large, it will threaten the adhesion reliability between the pure water guide cloth forming the pure water flow channel near the raw water inlet and the reverse osmosis membrane, but if the size of the raw water inlet is too small, it will reduce the water production efficiency.

[0042] Furthermore, in one embodiment, when the cover 10 is placed on the end surface, the side wall 12 of the cover 10 is bonded and sealed to the outer side of the reverse osmosis membrane group 22, thereby effectively isolating the pure water discharged from the outer side from the raw water inlet 1131.

[0043] Moreover, further, Figure 5 As shown, the side wall 12 of the cover body 10 near the bottom wall 11 can be provided with a position-limiting reinforcement part 121, and the position-limiting reinforcement part 121 can be hard-sealed and connected with the outer side surface, so as to achieve sealing and also provide position-limiting protection for the reverse osmosis membrane group 22 at the raw water inlet. That is, the position-limiting reinforcement part 121 can be position-limited and attached to the outer side surface of the reverse osmosis membrane group 22.

[0044] Furthermore, when the position-limiting reinforcement portion 121 is rigidly sealed with the outer side surface, Figure 5 As shown, the portion of the side wall 12 of the cover body 10 away from the bottom wall 11 of the cover body 10 is a guide portion, and the inner side surface of the guide portion is a guide slope 122, and the guide slope 122 gradually tilts outward in a direction away from the bottom wall 11 of the cover body 10.

[0045] Thus, during the installation process, the guide slope 122 can play a guiding role, so that the end surface of the reverse osmosis membrane group 22 can be easily inserted into the side wall 12 of the cover body 10, and the limiting reinforcement part 121 can be limited and fitted with the outer side surface.

[0046] After the reverse osmosis membrane group 22 is inserted into the cover body 10 , glue may be applied between the guide slope 122 and the outer side surface of the reverse osmosis membrane group 22 to form a seal.

[0047] Further, in another embodiment, a reverse osmosis filter 20 is provided, such as Figure 3 As shown, it includes a reverse osmosis element and the above-mentioned reverse osmosis element end cover, the cover body 10 is covered on the end surface of the reverse osmosis element, the reverse osmosis element includes a concentrate water pipe 21 and a reverse osmosis membrane group 22 rolled on the concentrate water pipe 21, the raw water flow channel of the reverse osmosis membrane group 22 is connected to the concentrate water pipe 21, the sealing area 112 of the cover body 10 is sealed with the end surface of the reverse osmosis membrane group 22, the raw water inlet of the reverse osmosis membrane group 22 corresponds to the raw water port 1131, and one end of the concentrate water pipe 21 passes through the installation through hole 111.

[0048] By setting the reverse osmosis element end cap described in any of the above embodiments in the reverse osmosis filter 20, as well as the concentrated water pipe 21 and the reverse osmosis membrane group 22 corresponding to the cover body 10, the raw water enters from the raw water inlet at the end face and is discharged from the concentrated water pipe 21 in the middle during the water production process, that is, the raw water is filtered along the long side of the raw water flow channel, thereby improving the water production efficiency. In addition, the concentrated water side formed during the water production process is close to the concentrated water pipe 21, and the tangential flow velocity in the raw water flow channel at the position close to the concentrated water pipe 21 is higher, thereby alleviating the concentration polarization phenomenon on the concentrated water side.

[0049] Specifically, the reverse osmosis membrane group 22 may include a reverse osmosis membrane, a water inlet spacer and a pure water guide cloth all rolled up on the concentrated water pipe 21, the front side of the reverse osmosis membrane is folded in half, the water inlet spacer is clamped between the front sides of the reverse osmosis membrane to form the raw water flow channel, the pure water guide cloth is located on the back side of the reverse osmosis membrane to form a pure water flow channel with a pure water outlet located on the outer side, and the raw water inlet is located on the long side of the water inlet spacer and away from one end of the concentrated water pipe.

[0050] Further, such as Figure 3 and Figure 4 As shown, in one embodiment, the pure water outlet of the reverse osmosis membrane group 22 is located on the outer side, and a filter element reinforcement 23 is sleeved on the outer side of the reverse osmosis membrane group 22 , and the filter element reinforcement 23 is in contact with the outer side of the reverse osmosis membrane group 22 .

[0051] By setting the pure water outlet of the reverse osmosis membrane group 22 on the outer side, the tangential flow velocity of the pure water near the concentrated water pipe 21 is relatively high, which effectively solves the problem of high back pressure of the concentrated water pipe 21. The pure water near the outer side in the pure water flow channel can be discharged faster. However, this will cause a relatively high pressure in the raw water flow channel, causing the reverse osmosis membrane group 22 to have a tendency to expand outward. By sleeved the filter element reinforcement 23 on the outer side of the reverse osmosis membrane group 22, the filter element reinforcement 23 is in contact with the outer side of the reverse osmosis membrane group 22, and the reverse osmosis membrane group 22 is protected by limiting the position, thereby improving the reliability of use.

[0052] In order to prevent the filter element reinforcement 23 from affecting the flowability of pure water, in one embodiment, Figure 4 and Figure 5 As shown, a water hole 231 is provided on the filter element reinforcement 23 , and the water hole 231 passes through the side wall 12 of the filter element reinforcement 23 .

[0053] Therefore, the pure water discharged from the pure water outlet on the outer side can continue to flow outward through the water hole 231 .

[0054] When the two end surfaces of the reverse osmosis element are both provided with the cover bodies 10 , the filter element reinforcement 23 is located between the two cover bodies 10 .

[0055] Furthermore, in order to further reduce the influence of the filter element reinforcement 23 on the flowability, Figure 5 As shown, the cover body 10 and the filter element reinforcement 23 are spaced apart, that is, pure water can flow out from the gap between the filter element reinforcement 23 and the cover body 10 .

[0056] Further, such as Figure 4 and Figure 5 As shown, in one embodiment, the reverse osmosis filter 20 further includes a membrane shell sleeve 24 and a membrane shell end cover 25. The membrane shell sleeve 24 is sleeved outside the filter element reinforcement 23, and the membrane shell sleeve 24 and the filter element reinforcement 23 are spaced apart to form a pure water diversion chamber 241. The membrane shell end cover 25 is provided with a first inlet 251, a first outlet 252 and a second outlet 253. The membrane shell end cover 25 is covered outside the cover body 10, the first outlet 252 is connected to the outlet of the concentrated water pipe 21, the first inlet 251 is connected to the raw water port 1131 on the cover body 10, and the membrane shell end cover 25 is connected to the membrane shell sleeve 24 to form a flow channel connecting the second outlet 253 and the pure water diversion chamber 241.

[0057] During the water production process, water first enters the raw water inlet from the first inlet 251, and after permeation in the reverse osmosis membrane group 22, the formed concentrated water is discharged from the concentrated water pipe 21 and continues to flow out from the first outlet 252, while the pure water flowing out of the pure water outlet on the outer side enters the pure water guide cavity 241, and then flows out through the second outlet 253.

[0058] Furthermore, in yet another embodiment, a water purification system is provided, comprising the reverse osmosis filter 20 described above.

[0059] The above scheme provides a water purification system, and by setting the reverse osmosis filter 20 described in any of the above embodiments in the water purification system, the forward path of the raw water is the long side of the raw water flow channel during the water production process, thereby improving the water production efficiency. In addition, the concentrated water flows out from the concentrated water pipe 21, and the tangential velocity of the concentrated water flow is high at a position close to the concentrated water pipe 21, thereby effectively alleviating the concentration polarization phenomenon on the concentrated water side.

[0060] When the reverse osmosis filter 20 includes the membrane shell sleeve 24 and the membrane shell end cover 25 , the first inlet 251 , the first outlet 252 and the second outlet 253 are used to communicate with corresponding pipelines in the system.

[0061] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0062] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A reverse osmosis element end cap, characterized in that: It comprises a cover body that can be covered on the end face of the reverse osmosis element, the bottom wall of the cover body comprises an installation through hole, a sealing area and an annular raw water inlet area, the installation through hole is used for the concentrated water pipe to pass through, the sealing area is arranged outside the installation through hole, the raw water inlet area is arranged around the periphery of the sealing area, the sealing area is used to seal with the end face of the reverse osmosis membrane group of the reverse osmosis element by glue application, the raw water inlet area is provided with a raw water inlet, and the raw water inlet is arranged corresponding to the raw water inlet of the reverse osmosis membrane group; The side wall of the cover body is provided with a position-limiting reinforcement part near the bottom wall, and the position-limiting reinforcement part can be hard-sealed and connected with the outer side surface of the reverse osmosis membrane group, and the part of the side wall of the cover body away from the bottom wall is a guide part, and the inner side surface of the guide part is a guide slope, and the guide slope gradually tilts outward in the direction away from the bottom wall; An annular raised rib is provided on the inner side of the bottom wall of the cover body, the raised rib is located between the sealing area and the raw water inlet area, and the raised rib can abut and seal against the end surface of the reverse osmosis membrane group; or, A raised rib is provided on the inner side of the bottom wall of the cover body, the raised rib surrounds the outside of the raw water inlet, and the raised rib can abut and seal against the end surface of the reverse osmosis membrane group; The length of the raw water inlet in the circumferential direction of the cover body is h, and the length of the raw water flow channel of the reverse osmosis membrane group in the circumferential direction is L, 1∕15≤h∕L≤1∕2.

2. The reverse osmosis element end cap according to claim 1, characterized in that: There are multiple raw water inlets, which are arranged at intervals in the circumferential direction of the cover body.

3. The reverse osmosis element end cap according to any one of claims 1 to 2, characterized in that: The radial thickness of the sealing area is r, the sum of the radial thicknesses of the raw water inlet area and the sealing area is R, and 2∕3≤r∕R<1.

4. The reverse osmosis element end cap according to any one of claims 1 to 2, characterized in that: The side wall of the cover body is bonded and sealed to the outer side surface of the reverse osmosis membrane group.

5. A reverse osmosis filter, characterized in that: It comprises a reverse osmosis element and the reverse osmosis element end cover according to any one of claims 1 to 4, wherein the cover body is arranged on the end face of the reverse osmosis element, the reverse osmosis element comprises a concentrate water pipe and a reverse osmosis membrane group rolled on the concentrate water pipe, the raw water flow channel of the reverse osmosis membrane group is connected with the concentrate water pipe, the sealing area of ​​the cover body is sealed with the end face of the reverse osmosis membrane group, the raw water inlet of the reverse osmosis membrane group corresponds to the raw water outlet, and one end of the concentrate water pipe passes through the mounting through hole.

6. The reverse osmosis filter according to claim 5, characterized in that The pure water outlet of the reverse osmosis membrane group is located on the outer side, and a filter element reinforcement is sleeved on the outer side of the reverse osmosis membrane group, and the filter element reinforcement is in contact with and fits the outer side of the reverse osmosis membrane group.

7. The reverse osmosis filter according to claim 6, characterized in that The filter element reinforcement is provided with a water hole, and the water hole passes through the side wall of the filter element reinforcement.

8. The reverse osmosis filter according to claim 6 or 7, characterized in that: The two end surfaces of the reverse osmosis element are both provided with the cover bodies, and the filter element reinforcement is located between the two cover bodies.

9. The reverse osmosis filter according to claim 6 or 7, characterized in that: It also includes a membrane shell sleeve and a membrane shell end cover, the membrane shell sleeve is sleeved outside the filter element reinforcement, and the membrane shell sleeve and the filter element reinforcement are spaced apart to form a pure water guide cavity, the membrane shell end cover is provided with a first inlet, a first outlet and a second outlet, the membrane shell end cover is disposed outside the cover body, the first outlet is communicated with the outlet of the concentrated water pipe, the first inlet is communicated with the raw water inlet on the cover body, the membrane shell end cover is connected to the membrane shell sleeve to form a flow channel connecting the second outlet and the pure water guide cavity.

10. A water purification system, characterized in that: A reverse osmosis filter comprising the reverse osmosis filter according to any one of claims 5 to 9.

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