A water purifier filter element and a reverse osmosis membrane element

Abstract

The present invention belongs to the technical field of water separation, and particularly relates to a water purifier filter element and a reverse osmosis membrane element. The reverse osmosis membrane element includes a central tube, and the central tube includes component one and component two. Component one includes a first annular body and a plurality of first arm plates. A first channel extending axially is formed on the first arm plate, and the outer end of the first channel extends to the outer wall surface of the first arm plate. Component two includes a second annular body and a plurality of second arm plates. A second channel extending axially is formed on the second arm plate, and the inner end of the second channel extends to the inner wall surface of the second arm plate. Component one and component two can be inserted into a pipe fitting, so that the first channels on the alternately distributed first arm plates can overlap and communicate with the second channels on the second arm plates, thereby forming a radially extending channel extending axially. The present invention can achieve the purpose of accelerating the confluence of produced water into the central tube, reducing the back pressure of the reverse osmosis membrane, and improving the produced water efficiency.

Description

Technical Field

[0001] The present invention belongs to the technical field of water separation in which components in water are separated to obtain purified water / produced water, and specifically relates to a water purifier filter element and a reverse osmosis membrane element. Background Art

[0002] Reverse osmosis technology is a membrane separation technology that uses pressure as a driving force to achieve the filtration and separation function of a selectively permeable membrane. The purified water / effluent / product water obtained after reverse osmosis treatment has removed most of the inorganic salts contained in the raw water, almost all organic matter, microorganisms, etc. The reverse osmosis membrane element involved in reverse osmosis technology is usually called a spiral reverse osmosis membrane element, which is one of the commonly used water purification elements. The existing spiral reverse osmosis membrane element generally includes a central tube and a multi-layer reverse osmosis selection membrane and a flow guide net that are alternately stacked and wound on the outer circumference of the central tube. Then the central tube is placed in the tube shell, and the central tube is connected to the two ends of the tube shell through a connector. The raw water is sent from the water inlet end of the tube shell into the cavity of the shell, and the water molecules in the raw water can be forced to pass through the reverse osmosis membrane into the central tube under the action of pressure, and can flow out from the end of the central tube to obtain purified water / product water. The remaining part of the raw water flows out from the water outlet end of the tube shell as waste water / concentrated water.

[0003] The center tube used in the past is usually a cylindrical tube made of ABS material, and usually multiple rows of through holes are distributed on the wall of the center tube. During operation, the raw water passes through the reverse osmosis membrane wrapped around the outer surface of the center tube and enters the inner cavity of the center tube through the through holes on the tube wall. Because the inner diameter of the through hole on the center tube is required to be about 15% to 25% of the outer diameter of the center tube, it is inevitable to limit the total flux section of all through holes on the center tube, which is prone to the problem that the produced water cannot be collected and flowed into the center tube in time, resulting in an increase in the back pressure of the reverse osmosis membrane, and is one of the important factors restricting the water production efficiency. In theory, by appropriately increasing the inner diameter or the number of distribution holes on the center tube, although the total flux section of the through hole can be increased, the rigidity of the center tube body will be weakened, resulting in a relatively smaller limit pressure that the center tube body can withstand, and it still cannot effectively solve the problem of relatively low water production rate of reverse osmosis membrane technology. Summary of the invention

[0004] In order to achieve the technical goal of reducing the back pressure of the reverse osmosis membrane and improving the water production efficiency, the present invention provides a water purifier filter element and a reverse osmosis membrane element, which specifically improves the central tube structure of the reverse osmosis membrane element to accelerate the convergence of produced water into the central tube, reduce the back pressure of the reverse osmosis membrane, and improve the water production efficiency.

[0005] The technical solution adopted by the present invention to solve its technical problem is: a reverse osmosis membrane element, including a central tube, and the central tube includes a component one and a component two.

[0006] Component 1 includes a first annular body and a plurality of first arm plates disposed on the first annular body, with the first arm plates being circumferentially spaced apart. On both side surfaces of the first arm plates, there are respectively formed channels 1 extending in the axial direction. The outer ends of channels 1 extend to the outer wall surfaces of the first arm plates, and there is a spacing formed between the inner ends and the inner wall surfaces of the first arm plates. On the first annular body, a plurality of first convex columns are circumferentially spaced apart. On the end surfaces of the first arm plates, there are formed holes 1.

[0007] Component 2 includes a second annular body and a plurality of second arm plates disposed on the second annular body, with the second arm plates being circumferentially spaced apart. On both side surfaces of the second arm plates, there are respectively formed channels 2 extending in the axial direction. The inner ends of channels 2 extend to the inner wall surfaces of the second arm plates, and there is a spacing formed between the outer ends and the outer wall surfaces of the second arm plates. On the second annular body, a plurality of second convex columns are circumferentially spaced apart. On the end surfaces of the second arm plates, there are formed holes 2.

[0008] Component 1 and Component 2 can be matched to form a pipe fitting. At that time, the first arm plates and the second arm plates are in a state of being alternately / interleaved in the circumferential direction; between the contacting channels 1 and channels 2, the inner end of channel 1 and the outer end of channel 2 can overlap and communicate with each other; the first convex columns and the holes 2 are in one-to-one correspondence and matching, and the first convex columns can be correspondingly inserted into the holes 2 to connect the second arm plates and the first annular body into a whole; the second convex columns and the holes 1 are in one-to-one correspondence and matching, and the second convex columns can be correspondingly inserted into the holes 1 to connect the first arm plates and the second annular body into a whole. It can be seen that both the first arm plates and the second arm plates are arc-shaped plates. Reinforcing ribs extending in the axial direction can be respectively provided on the concave surfaces of the first arm plates and the second arm plates to increase the rigidity of the arm plates.

[0009] Optionally, hole 1 penetrates through the first arm plate and one end extends to the first annular body, and the end of the second convex column can be inserted into the first annular body. Hole 2 penetrates through the second arm plate and one end extends to the second annular body, and the end of the first convex column can be inserted into the second annular body. That is, both hole 1 and hole 2 extend in the vertical direction or in other words in the axial direction, and respectively extend from the lower end surfaces of the first arm plates and the upper end surfaces of the second arm plates in the vertical direction towards one end close to the first annular body or the second annular body, and partially extend to the body of the first annular body or the body of the second annular body.

[0010] Optionally, a plurality of first fin plates are respectively formed on both side surfaces of the first arm plates, and the plurality of first fin plates formed on the same side surface are axially spaced apart. The first fin plates extend in the circumferential direction and are relatively located inside channel 1 in the radial direction. Correspondingly, on the bottom surface of channel 2, there is formed a bottom groove 2 that can be correspondingly matched with the first fin plates.

[0011] On two side surfaces of the second arm plate, a plurality of second fin plates are respectively formed, and the plurality of second fin plates formed on the same side surface are axially spaced apart. The second fin plates extend in the circumferential direction and are relatively located outside the second channel in the radial direction. Correspondingly, a first bottom groove capable of corresponding and matching with the second fin plate is formed on the bottom surface of the first channel.

[0012] When the first arm plate and the second arm plate are inserted and matched, the first fin plate can be inserted into the second bottom groove in the vertical direction, and the second fin plate can be inserted into the first bottom groove in the vertical direction. A profiled surface contact matching relationship can be formed between the part of the first fin plate inserted into the second bottom groove and the inner wall of the second bottom groove, and a profiled surface contact matching relationship can be formed between the part of the second fin plate inserted into the first bottom groove and the inner wall of the first bottom groove to ensure the firmness of the whole formed by connecting the first arm plate and the second arm plate and further improve the pressure-bearing capacity.

[0013] Optionally, the bottom surface of the first channel is formed as a first wedge surface, and the outer end width of the first channel is greater than the inner end width. The bottom surface of the second channel is formed as a second wedge surface, and the inner end width of the second channel is greater than the outer end width.

[0014] Optionally, a plurality of first peripheral grooves axially spaced apart are formed on the outer wall surface of the first arm plate, and both ends of the first peripheral grooves respectively extend to the two side surfaces of the first arm plate and communicate with the first channels on both sides thereof. At the same time, a plurality of second peripheral grooves axially spaced apart are formed on the outer wall surface of the second arm plate, and both ends of the second peripheral grooves respectively extend to the two side surfaces of the second arm plate and communicate with the second channels on both sides thereof.

[0015] Optionally, a plurality of first axial grooves are formed on the outer wall surface of the first arm plate and are circumferentially spaced apart. Both ends of the first axial grooves respectively extend toward the upper end side and the lower end side of the first arm plate, so that the first axial grooves can connect the respective first peripheral grooves distributed on the same first arm plate and establish an axial communication channel between the plurality of first peripheral grooves.

[0016] Optionally, a plurality of first radial through holes axially spaced apart are distributed on at least part of the first axial grooves. The first radial through holes can be correspondingly arranged at the positions where the first axial grooves intersect with the first peripheral grooves or at the positions between two adjacent first peripheral grooves.

[0017] Optionally, a plurality of second axial grooves are formed on the outer wall surface of the second arm plate and are circumferentially spaced apart. Both ends of the second axial grooves respectively extend toward the upper end side and the lower end side of the second arm plate, so that the second axial grooves can connect the respective second peripheral grooves distributed on the same second arm plate and establish an axial communication channel between the plurality of second peripheral grooves.

[0018] Optionally, a plurality of radially spaced through-holes II are distributed at least partially on the axial groove II, and are axially spaced apart. The radially through-holes II can be correspondingly arranged at the intersection of the axial groove II and the circumferential groove II, or can be arranged between two adjacent circumferential grooves II.

[0019] A water purifier filter element includes the reverse osmosis membrane element described in any one of the above.

[0020] The beneficial effects of the present invention are: The water purifier filter element and the reverse osmosis membrane element involved in the present invention can accelerate the confluence of water production into the central pipe compared with the prior art, reduce the back pressure of the reverse osmosis membrane, and improve the water production efficiency. Description of the Drawings

[0021] Figure 1 It is a schematic assembly structure diagram of the present invention.

[0022] Figure 2 It is a schematic view of a partial cross-sectional structure of the first component in the main viewing direction.

[0023] Figure 3 For Figure 2 It is a schematic cross-sectional structure diagram at A-A in

[0024] Figure 4 It is a schematic view of a partial cross-sectional structure of the second component in the main viewing direction.

[0025] Figure 5 For Figure 4 It is a schematic cross-sectional structure diagram at B-B in

[0026] Figure 6 For Figure 4 It is a schematic cross-sectional structure diagram at C-C in

[0027] Figure 7 It is a schematic cross-sectional structure diagram of the first arm plate and the second arm plate in the matching state.

[0028] Figure 8 For Figure 7 It is a schematic diagram of a partially enlarged structure at I in

[0029] Figure 9 It is a schematic cross-sectional structure diagram of an optimized scheme of the first arm plate and the second arm plate in the matching state.

[0030] Figure 10 For Figure 9 It is a schematic diagram of a partially enlarged structure at II in

[0031] In the figure: Component 10, first annular body 11, first convex column 111, first arm plate 12, first channel 121, first wedge surface 1211, first fin plate 122, first bottom groove 123, first shaped hole 124, first circumferential groove 125, first axial groove 126, first radial through hole 127, first annular flange 13; Component 20, second annular body 21, second convex column 211, shaft hole 212, second arm plate 22, second channel 221, second wedge surface 2211, second fin plate 222, second bottom groove 223, second shaped hole 224, second circumferential groove 225, second axial groove 226, second radial through hole 227, second annular flange 23. Detailed implementation manner

[0032] The structures, ratios, sizes, etc. shown in the accompanying drawings of the specification are only used to cooperate with the content disclosed in the specification for those skilled in this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention. Therefore, they do not have technical essential significance. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present invention. At the same time, terms such as "upper", "lower", "front", "rear", "middle", etc. cited in this specification are only for the convenience of clear narration and are not used to limit the scope for the implementation of the present invention. The change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the scope for the implementation of the present invention.

[0033] As Figures 1 to 8 shown, a reverse osmosis membrane element includes a central tube, and the central tube includes Component 10 and Component 20.

[0034] The Component 10 includes a first annular body 11 and four first arm plates 12 arranged on the first annular body 11, and the four first arm plates 12 are evenly distributed at intervals in the circumferential direction. Specifically in implementation, the number of the first arm plates 12 provided is generally between four and ten. The radial thickness of the first arm plate 12 is not greater than the radial width of the first annular body 11. Preferably, the first arm plates 12 are distributed at positions close to the outer peripheral surface edge of the first annular body 11.

[0035] On both side surfaces of the first arm plate 12, a first channel 121 extending in the axial direction (i.e., the up and down direction) is respectively formed, such that the first channel 121 extends upward from the lower end surface of the first arm plate 12 to the root of the first arm plate 12. The outer end (or outer port) of the first channel 121 extends to the outer wall surface of the first arm plate 12, and a (radial) spacing is formed between the inner end (or inner bottom end) of the first channel 121 and the inner wall surface of the first arm plate 12. The outer wall surface of the first arm plate 12 is an outwardly protruding arc surface, and the inner wall surface is an inwardly concave arc surface, that is, the first arm plate 12 is in the shape of an arc plate. The outer wall surfaces of multiple first arm plates 12 can be distributed on the same circumferential surface, and the inner wall surfaces of multiple first arm plates 12 can be distributed on the same circumferential surface. On the lower end surface of the first arm plate 12, a plurality of first holes 124 are formed. The axial extension direction of the first holes 124 is consistent with the (length) extension direction of the first arm plate 12.

[0036] On the lower end surface of the first annular body 11, a plurality of first convex columns 111 are distributed around the circumferential direction, that is, on the lower end surface of the first annular body 11, and in the regions corresponding to the areas between two adjacent first arm plates 12, the first convex columns 111 are all distributed. Preferably, in the embodiment where a plurality of first convex columns 111 are arranged in the regions between every two adjacent first arm plates 12 on the end surface of the first annular body 11; the axis lines of the plurality of first convex columns 111 can be distributed on at least two circumferential surfaces. The axial extension direction of the first convex columns 111 is consistent with the (length) extension direction of the first arm plate 12.

[0037] The second component 20 includes a second annular body 21 and a plurality of second arm plates 22 arranged on the second annular body 21, and the second arm plates 22 are evenly spaced around the circumferential direction. Specifically in implementation, the number of the second arm plates 22 provided, referring to the first arm plate 12, is generally also between four and ten. The radial thickness of the second arm plate 22 is not greater than the radial width of the second annular body 21. Preferably, the second arm plates 22 are distributed at positions close to the outer peripheral surface edge of the second annular body 21. In addition, the number of the first arm plates 12 provided is the same as the number of the second arm plates 22, so that the two can be alternately / interleaved in the circumferential direction and can be inserted into each other to form a cylindrical structure / tubular structure.

[0038] On two side surfaces of the second arm plate 22, there are respectively formed channels two 221 extending in the axial direction (i.e., the up and down direction), so that the channels two 221 extend from the upper end surface of the second arm plate 22 downward to the root of the second arm plate 22. The inner end (or inner port) of the channel two 221 extends to the inner wall surface of the second arm plate 22, and there is a (radial) spacing formed between the outer end (or inner bottom end) of the channel two 221 and the outer wall surface of the second arm plate 22. The outer wall surface of the second arm plate 22 is an outwardly protruding arc surface, and the inner wall surface is an inwardly concave arc surface, that is, the second arm plate 22 is in the shape of an arc plate. The outer wall surfaces of multiple second arm plates 22 can be distributed on the same circumferential surface, and the inner wall surfaces of multiple second arm plates 22 can be distributed on the same circumferential surface. On the upper end surface of the second arm plate 22, there are formed multiple holes two 224. The axial extension direction of the holes two 224 is consistent with the (length) extension direction of the second arm plate 22.

[0039] On the upper end surface of the second annular body 21, there are distributed multiple protruding columns two 211 around the circumferential direction, that is, on the upper end surface of the second annular body 21, and corresponding to the area between two adjacent second arm plates 22, the protruding columns two 211 are distributed. Preferably, in the embodiment where multiple protruding columns two 211 are arranged in the area between every two adjacent second arm plates 22 on the end surface of the second annular body 21; the axial center lines of the multiple protruding columns two 211 can be distributed on at least two circumferential surfaces. The axial extension direction of the protruding columns two 211 is consistent with the (length) extension direction of the second arm plate 22.

[0040] The component one 10 and the component two 20 can be matched into a pipe fitting. During assembly, the component one 10 and the component two 20 are inserted and connected in an up and down opposite manner. At that time, multiple first arm plates 12 and multiple second arm plates 22 cross each other and are alternately / interleaved in the circumferential direction, that is, between every two adjacent first arm plates 12, one second arm plate 22 can be correspondingly inserted, and between every two adjacent second arm plates 22, one first arm plate 12 can also be correspondingly inserted, as can be seen in Figure 7 、 Figure 9 the shown distribution state. Finally, the outer wall surfaces of multiple first arm plates 12 and the outer wall surfaces of multiple second arm plates 22 can be distributed on the same circle / cylinder, and at the same time, the inner wall surfaces of multiple first arm plates 12 and the inner wall surfaces of multiple second arm plates 22 can also be distributed on the same circle / cylinder, so that the first arm plate 12 and the second arm plate 22 are inserted to form a cylindrical / tubular structure.

[0041] After the first arm plate 12 and the second arm plate 22 are fully and sufficiently plugged and connected, the inner end of the first channel 121 provided on the side surface of the first arm plate 12 overlaps / partially overlaps with the outer end of the second channel 221 which is adjacent and provided on the side surface of the second arm plate 22, so as to promote the first channel 121 and the second channel 221 which are adjacent / close to each other to be aligned to form a radial channel, enabling the peripheral space of the central pipe to communicate with its shaft hole 212, and forming a plurality of strip-shaped flow channels for purified water / product water to enter the central pipe. At the same time, the first convex posts 111 and the second holes 224 are in one-to-one correspondence and match, and the second convex posts 211 and the first holes 124 are in one-to-one correspondence and match. Moreover, after the first convex posts 111 are inserted into the second holes 224, the plurality of second arm plates 22 can be connected to the first annular body 11 as a whole; after the second convex posts 211 are inserted into the first holes 124, the plurality of first arm plates 12 can be connected to the second annular body 21 as a whole.

[0042] In the above solution, the first channel 121 provided on the first arm plate 12 and the second channel 221 provided on the second arm plate 22 can be buckled / aligned and staggered to communicate, forming a radial flow channel on the spliced central pipe. Compared with the prior art method of distributing through holes on the pipe wall of the central pipe, it can relatively increase the flow channel cross-section of the central pipe, accelerate the convergence of product water into the central pipe, reduce the back pressure of the reverse osmosis membrane, and improve the product water efficiency on the premise of ensuring that the pressure-bearing capacity (of the central pipe) meets the requirements. The first arm plate 12 and the second arm plate 22 are both in the form of arc-shaped plates and are alternately distributed, which can improve their respective radial stress states and help to disperse the radial pressure of the internal pressure acting on the protruding surface / outer wall surface of the arm plate. At the same time, by selecting materials with better strength and stiffness or strengthening (such as sleeving, winding and strengthening the outer pipe or fiber layer), the first convex posts 111 and the second convex posts 211 can easily ensure that the support stiffness formed by the convex posts on the arm plate meets the conditions for bearing high pressure.

[0043] To improve the strength and stiffness of the central tube formed by insertion and further enhance its compressive capacity. The first type hole 124 can penetrate the entire length / axis of the first arm plate 12, and enable the second convex post 211 to be fully inserted into the first type hole 124 from bottom to top, so as to enhance the pressure-bearing (resisting the pressure in the radial direction) capacity of the first arm plate 12. Similarly, the second type hole 224 can penetrate the entire length / axis of the second arm plate 22, and enable the first convex post 111 to be fully inserted into the second type hole 224 from top to bottom, so as to enhance the pressure-bearing (resisting the pressure in the radial direction) capacity of the second arm plate 22. At that time, extend the first type hole 124 upward to the body of the first annular body 11, and insert the upper end of the second convex post 211 into the first annular body 11 to further improve the ability of the first arm plate 12 to bear radial pressure. Similarly, extend the second type hole 224 downward to the body of the second annular body 21, and insert the lower end of the first convex post 111 into the second annular body 21 to further improve the ability of the second arm plate 22 to bear radial pressure.

[0044] In Figures 1 to 8 In the solution shown, different from the technical features described in the previous paragraph, the first type hole 124 only extends on the first arm plate 12, and at the same time the second type hole 224 only extends on the second arm plate 22. Therefore, the first convex post 111 cannot extend to the second annular body 21 and be connected to the second annular body 21, and the second convex post 211 cannot extend to the first annular body 11 and be connected to the first annular body 11.

[0045] In the following three paragraphs of description, it is set that the length of the first fin 122 is used as the dimension parameter in the axial direction, and at the same time, the width of the first fin 122 is used as the dimension parameter in the circumferential direction; similarly, the length of the second fin 222 is used as the dimension parameter in the axial direction, and at the same time, the width of the second fin 222 is used as the dimension parameter in the circumferential direction.

[0046] As Figures 1 to 10As shown, a plurality of first fins 122 are respectively formed on two side surfaces of the first arm plate 12, and the plurality of first fins 122 formed on the same side surface are axially (in the up and down direction) spaced apart. The first fins 122 extend outward from the side surface of the first arm plate 12 in the circumferential direction by a certain width and are located inside the first channel 121 in the radial direction; at the same time, there is a radial distance between the first fins 122 and the inner wall surface of the first arm plate 12 in the radial direction. Correspondingly, a bottom groove 223 capable of corresponding and matching with the first fins 122 is formed on the bottom surface of the second channel 221. The bottom groove 223 extends axially / vertically, and the upper and lower ends of the bottom groove 223 respectively extend to the upper end side and the lower end side of the second arm plate 22.

[0047] A plurality of second fins 222 are respectively formed on two side surfaces of the second arm plate 22, and the plurality of second fins 222 formed on the same side surface are axially (in the up and down direction) spaced apart. The second fins 222 extend outward from the side surface of the second arm plate 22 in the circumferential direction by a certain width and are located outside the second channel 221 in the radial direction; at the same time, there is a radial distance between the second fins 222 and the outer wall surface of the second arm plate 22 in the radial direction. Correspondingly, a bottom groove 123 capable of corresponding and matching with the second fins 222 is formed on the bottom surface of the first channel 121. The bottom groove 123 extends axially / vertically, and the upper and lower ends of the bottom groove 123 respectively extend to the upper end side and the lower end side of the first arm plate 12.

[0048] See Figure 2 、 Figure 4 and Figure 7 、 Figure 9 , the length of the first fins 122 is greater than the length of the second fins 222. After assembly, between the second fins 222 and the first fins 122 at the same height position (axial position) and relatively inside and outside (but not directly facing), the lengths of the second fins 222 and the first fins 122 are axially centered relative to each other. Generally, the length of the first fins 122 is 1.5 to 3 times the length of the second fins 222.

[0049] When the first component 10 is inserted and connected to the second component 20, the first fins 122 can be inserted into the bottom groove 223 from top to bottom; the second fins 222 can be inserted into the bottom groove 123 from bottom to top. By setting the related technical features such as the first fins 122, the second fins 222, the bottom groove 123, and the bottom groove 223, the stiffness of the central tube formed by inserting and connecting the first component 10 and the second component 20 can be significantly improved, and the radial pressure-bearing capacity of the central tube can be further improved, which helps to further improve the water production rate of the reverse osmosis membrane technology.

[0050] To increase the flow cross-section of the flow channel formed by the mating of the first channel 121 and the second channel 221 and improve the flow rate of the produced water into the central pipe, the following design can be made: The bottom surface of the first channel 121 is formed as a first wedge surface 1211. The inclination direction of the first wedge surface 1211 enables the outer end width of the first channel 121 to be greater than the inner end width. The bottom surface of the second channel 221 is formed as a second wedge surface 2211. The inclination direction of the second wedge surface 2211 enables the inner end width of the second channel 221 to be greater than the outer end width.

[0051] The first bottom groove 123 is formed on the first wedge surface 1211 and near the outer end side of the first wedge surface 1211. The second bottom groove 223 is formed on the second wedge surface 2211 and near the inner end side of the second wedge surface 2211.

[0052] To further increase the (unit) water throughput of the assembled central pipe, accelerate the converging speed of the produced water into the central pipe, reduce the back pressure of the reverse osmosis membrane, and improve the produced water efficiency. Based on the above solution, further optimization is made as follows: As shown Figures 9 to 10 in the figure, a plurality of circumferential grooves 125 are formed on the outer wall surface of the first arm plate 12 and are axially spaced apart, and both ends of each circumferential groove 125 (in the circumferential direction) extend to the two side surfaces of the first arm plate 12 respectively, so as to be able to communicate with the first channel 121 formed on the two side surfaces of the first arm plate 12. A plurality of circumferential grooves 225 are formed on the outer wall surface of the second arm plate 22 and are axially spaced apart, and both ends of each circumferential groove 225 (in the circumferential direction) extend to the two side surfaces of the second arm plate 22 respectively, so as to be able to communicate with the second channel 221 formed on the two side surfaces of the second arm plate 22.

[0053] To enable the produced water to converge uniformly and quickly into the lumen of the (assembled) central pipe and improve the uniformity of the pressure on the periphery of the central pipe. Three axial grooves 126 are formed on the outer wall surface of the first arm plate 12 and are circumferentially spaced apart. Both ends of the axial groove 126 extend to the upper end side and the lower end side of the first arm plate 12 respectively. The axial groove 126 can promote the communication between the circumferential grooves 125 distributed on the same first arm plate 12. Three axial grooves 226 are formed on the outer wall surface of the second arm plate 22 and are circumferentially spaced apart. Both ends of the axial groove 226 extend to the upper end side and the lower end side of the second arm plate 22 respectively. The axial groove 226 can promote the communication between the circumferential grooves 225 distributed on the same second arm plate 22.

[0054] The radial depth of the first axial groove 126 is greater than that of the first circumferential groove 125. The radial depth of the second axial groove 226 is greater than that of the second circumferential groove 225.

[0055] To further increase the flow cross-section of the produced water into the central pipe, and further promote the effect of the produced water flowing uniformly and quickly into the central pipe, better optimize the pressure environment around the central pipe, and improve the water production rate. A plurality of first radial through-holes 127 spaced axially apart can be distributed on some of the first axial grooves 126 on the same first arm plate 12. And a plurality of second radial through-holes 227 spaced axially apart can be distributed on some of the second axial grooves 226 on the same second arm plate 22, see Figure 9 , Figure 10 . The inner diameters of the first radial through-holes 127 and the second radial through-holes 227 are much smaller than the inner diameters of the through-holes arranged on the existing central pipe, so as to prevent the stiffness and strength of the central pipe from being significantly weakened due to the setting of the radial through-holes, affecting the compressive / pressure-bearing capacity of the central pipe. To enable a plurality of the central pipes to be firmly connected in series, a first annular flange 13 can be provided on the upper end surface of the first annular body 11, and a second annular flange 23 can be provided on the lower end surface of the second annular body 21.

[0056] A water purifier filter element according to the present invention includes the above-mentioned reverse osmosis membrane element.

[0057] The above embodiments are only illustrative of the principles and effects of the present invention, and are not used to limit the present invention. There are many aspects of the present invention that can be improved without departing from the overall idea. Those familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A reverse osmosis membrane element, comprising a central tube; characterized in that: The central tube includes component one (10) and component two (20); Component one (10) includes a first annular body (11) and a plurality of first arm plates (12) arranged on the first annular body (11), with the first arm plates (12) evenly distributed at intervals in the circumferential direction; on both side surfaces of the first arm plate (12), a first channel (121) extending in the axial direction is respectively formed; the outer end of the first channel (121) extends to the outer wall surface of the first arm plate (12), and a spacing is formed between the inner end and the inner wall surface of the first arm plate (12); on the first annular body (11), a plurality of first convex columns (111) are distributed in the circumferential direction; a first shaped hole (124) is formed on the end surface of the first arm plate (12); Component two (20) includes a second annular body (21) and a plurality of second arm plates (22) arranged on the second annular body (21), with the second arm plates (22) evenly distributed at intervals in the circumferential direction; on both side surfaces of the second arm plate (22), a second channel (221) extending in the axial direction is respectively formed; the inner end of the second channel (221) extends to the inner wall surface of the second arm plate (22), and a spacing is formed between the outer end and the outer wall surface of the second arm plate (22); on the second annular body (21), a plurality of second convex columns (211) are distributed in the circumferential direction; a second shaped hole (224) is formed on the end surface of the second arm plate (22); Component one (10) and component two (20) can be matched into a pipe fitting, with the first arm plates (12) and the second arm plates (22) alternately distributed in the circumferential direction, and the inner end of the first channel (121) overlapping with the outer end of the second channel (221). The first convex columns (111) are inserted into the second shaped holes (224) to connect the second arm plates (22) and the first annular body (11) into a whole, and the second convex columns (211) are inserted into the first shaped holes (124) to connect the first arm plates (12) and the second annular body (21) into a whole.

2. An RO membrane element according to claim 1, wherein: The first shaped hole (124) penetrates the first arm plate (12) and extends to the side of the first annular body (11), enabling the end of the second convex column (211) to be inserted onto the first annular body (11); the second shaped hole (224) penetrates the second arm plate (22) and extends to the side of the second annular body (21), enabling the end of the first convex column (111) to be inserted onto the second annular body (21).

3. An RO membrane element according to claim 1, characterized in that: On both side surfaces of the first arm plate (12), a plurality of first fin plates (122) are respectively formed, and the plurality of first fin plates (122) on the same side surface are distributed at intervals in the axial direction; the first fin plates (122) extend in the circumferential direction and are relatively located inside the first channel (121); on the bottom surface of the second channel (221), a bottom groove two (223) capable of corresponding and matching with the first fin plates (122) is formed; On both side surfaces of the second arm plate (22), a plurality of second fin plates (222) are respectively formed, and the plurality of second fin plates (222) on the same side surface are distributed at intervals in the axial direction; the second fin plates (222) extend in the circumferential direction and are relatively located outside the second channel (221); on the bottom surface of the first channel (121), a bottom groove one (123) capable of corresponding and matching with the second fin plates (222) is formed.

4. An RO membrane element according to claim 1, characterized in that: The bottom surface of the first channel (121) is formed as a first wedge surface (1211), such that the outer end width of the first channel (121) is greater than the inner end width; the bottom surface of the second channel (221) is formed as a second wedge surface (2211), such that the inner end width of the second channel (221) is greater than the outer end width.

5. An RO membrane element according to claim 1, wherein: On the outer wall surface of the first arm plate (12), a plurality of circumferential grooves one (125) are formed and distributed at intervals in the axial direction, and both ends of the circumferential groove one (125) are respectively communicated with the first channels (121) on both sides thereof; on the outer wall surface of the second arm plate (22), a plurality of circumferential grooves two (225) are formed and distributed at intervals in the axial direction, and both ends of the circumferential groove two (225) are respectively communicated with the second channels (221) on both sides thereof.

6. The reverse osmosis membrane element according to claim 5, characterized in that: On the outer wall surface of the first arm plate (12), a plurality of axial grooves one (126) are formed and distributed at intervals in the circumferential direction; and / or, on the outer wall surface of the second arm plate (22), a plurality of axial grooves two (226) are formed and distributed at intervals in the circumferential direction; The axial groove one (126) can connect all the circumferential grooves one (125) on the first arm plate (12) to each other; The axial groove two (226) can connect all the circumferential grooves two (225) on the second arm plate (22) to each other.

7. An RO membrane element according to claim 6, characterized in that: At least on part of the axial groove one (126), a plurality of radial through holes one (127) are provided and distributed at intervals in the axial direction; and / or, at least on part of the axial groove two (226), a plurality of radial through holes two (227) are provided and distributed at intervals in the axial direction.

8. A water purifier filter element, characterized in that: Comprising the reverse osmosis membrane element according to any one of claims 1 to 7.

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